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vino.c

/*
 * Driver for the VINO (Video In No Out) system found in SGI Indys.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License version 2 as published by the Free Software Foundation.
 *
 * Copyright (C) 2004,2005 Mikael Nousiainen <tmnousia@cc.hut.fi>
 *
 * Based on the previous version of the driver for 2.4 kernels by:
 * Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org>
 */

/*
 * TODO:
 * - remove "mark pages reserved-hacks" from memory allocation code
 *   and implement nopage()
 * - check decimation, calculating and reporting image size when
 *   using decimation
 * - implement read(), user mode buffers and overlay (?)
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/time.h>
#include <linux/version.h>

#ifdef CONFIG_KMOD
#include <linux/kmod.h>
#endif

#include <linux/i2c.h>
#include <linux/i2c-algo-sgi.h>

#include <linux/videodev.h>
#include <media/v4l2-common.h>
#include <linux/video_decoder.h>
#include <linux/mutex.h>

#include <asm/paccess.h>
#include <asm/io.h>
#include <asm/sgi/ip22.h>
#include <asm/sgi/mc.h>

#include "vino.h"
#include "saa7191.h"
#include "indycam.h"

/* Uncomment the following line to get lots and lots of (mostly useless)
 * debug info.
 * Note that the debug output also slows down the driver significantly */
// #define VINO_DEBUG
// #define VINO_DEBUG_INT

#define VINO_MODULE_VERSION "0.0.5"
#define VINO_VERSION_CODE KERNEL_VERSION(0, 0, 5)

MODULE_DESCRIPTION("SGI VINO Video4Linux2 driver");
MODULE_VERSION(VINO_MODULE_VERSION);
MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
MODULE_LICENSE("GPL");

#ifdef VINO_DEBUG
#define dprintk(x...) printk("VINO: " x);
#else
#define dprintk(x...)
#endif

#define VINO_NO_CHANNEL             0
#define VINO_CHANNEL_A              1
#define VINO_CHANNEL_B              2

#define VINO_PAL_WIDTH              768
#define VINO_PAL_HEIGHT             576
#define VINO_NTSC_WIDTH             640
#define VINO_NTSC_HEIGHT            480

#define VINO_MIN_WIDTH              32
#define VINO_MIN_HEIGHT             32

#define VINO_CLIPPING_START_ODD_D1  1
#define VINO_CLIPPING_START_ODD_PAL 15
#define VINO_CLIPPING_START_ODD_NTSC      12

#define VINO_CLIPPING_START_EVEN_D1 2
#define VINO_CLIPPING_START_EVEN_PAL      15
#define VINO_CLIPPING_START_EVEN_NTSC     12

#define VINO_INPUT_CHANNEL_COUNT    3

/* the number is the index for vino_inputs */
#define VINO_INPUT_NONE             -1
#define VINO_INPUT_COMPOSITE        0
#define VINO_INPUT_SVIDEO           1
#define VINO_INPUT_D1               2

#define VINO_PAGE_RATIO             (PAGE_SIZE / VINO_PAGE_SIZE)

#define VINO_FIFO_THRESHOLD_DEFAULT 16

#define VINO_FRAMEBUFFER_SIZE       ((VINO_PAL_WIDTH \
                                * VINO_PAL_HEIGHT * 4 \
                                + 3 * PAGE_SIZE) & ~(PAGE_SIZE - 1))

#define VINO_FRAMEBUFFER_COUNT_MAX  8

#define VINO_FRAMEBUFFER_UNUSED           0
#define VINO_FRAMEBUFFER_IN_USE           1
#define VINO_FRAMEBUFFER_READY            2

#define VINO_QUEUE_ERROR            -1
#define VINO_QUEUE_MAGIC            0x20050125

#define VINO_MEMORY_NONE            0
#define VINO_MEMORY_MMAP            1
#define VINO_MEMORY_USERPTR         2

#define VINO_DUMMY_DESC_COUNT       4
#define VINO_DESC_FETCH_DELAY       5     /* microseconds */

#define VINO_MAX_FRAME_SKIP_COUNT   128

/* the number is the index for vino_data_formats */
#define VINO_DATA_FMT_NONE          -1
#define VINO_DATA_FMT_GREY          0
#define VINO_DATA_FMT_RGB332        1
#define VINO_DATA_FMT_RGB32         2
#define VINO_DATA_FMT_YUV           3

#define VINO_DATA_FMT_COUNT         4

/* the number is the index for vino_data_norms */
#define VINO_DATA_NORM_NONE         -1
#define VINO_DATA_NORM_NTSC         0
#define VINO_DATA_NORM_PAL          1
#define VINO_DATA_NORM_SECAM        2
#define VINO_DATA_NORM_D1           3
/* The following are special entries that can be used to
 * autodetect the norm. */
#define VINO_DATA_NORM_AUTO         0xfe
#define VINO_DATA_NORM_AUTO_EXT           0xff

#define VINO_DATA_NORM_COUNT        4

/* Internal data structure definitions */

struct vino_input {
      char *name;
      v4l2_std_id std;
};

struct vino_clipping {
      unsigned int left, right, top, bottom;
};

struct vino_data_format {
      /* the description */
      char *description;
      /* bytes per pixel */
      unsigned int bpp;
      /* V4L2 fourcc code */
      __u32 pixelformat;
      /* V4L2 colorspace (duh!) */
      enum v4l2_colorspace colorspace;
};

struct vino_data_norm {
      char *description;
      unsigned int width, height;
      struct vino_clipping odd;
      struct vino_clipping even;

      v4l2_std_id std;
      unsigned int fps_min, fps_max;
      __u32 framelines;
};

struct vino_descriptor_table {
      /* the number of PAGE_SIZE sized pages in the buffer */
      unsigned int page_count;
      /* virtual (kmalloc'd) pointers to the actual data
       * (in PAGE_SIZE chunks, used with mmap streaming) */
      unsigned long *virtual;

      /* cpu address for the VINO descriptor table
       * (contains DMA addresses, VINO_PAGE_SIZE chunks) */
      unsigned long *dma_cpu;
      /* dma address for the VINO descriptor table
       * (contains DMA addresses, VINO_PAGE_SIZE chunks) */
      dma_addr_t dma;
};

struct vino_framebuffer {
      /* identifier nubmer */
      unsigned int id;
      /* the length of the whole buffer */
      unsigned int size;
      /* the length of actual data in buffer */
      unsigned int data_size;
      /* the data format */
      unsigned int data_format;
      /* the state of buffer data */
      unsigned int state;
      /* is the buffer mapped in user space? */
      unsigned int map_count;
      /* memory offset for mmap() */
      unsigned int offset;
      /* frame counter */
      unsigned int frame_counter;
      /* timestamp (written when image capture finishes) */
      struct timeval timestamp;

      struct vino_descriptor_table desc_table;

      spinlock_t state_lock;
};

struct vino_framebuffer_fifo {
      unsigned int length;

      unsigned int used;
      unsigned int head;
      unsigned int tail;

      unsigned int data[VINO_FRAMEBUFFER_COUNT_MAX];
};

struct vino_framebuffer_queue {
      unsigned int magic;

      /* VINO_MEMORY_NONE, VINO_MEMORY_MMAP or VINO_MEMORY_USERPTR */
      unsigned int type;
      unsigned int length;

      /* data field of in and out contain index numbers for buffer */
      struct vino_framebuffer_fifo in;
      struct vino_framebuffer_fifo out;

      struct vino_framebuffer *buffer[VINO_FRAMEBUFFER_COUNT_MAX];

      spinlock_t queue_lock;
      struct mutex queue_mutex;
      wait_queue_head_t frame_wait_queue;
};

struct vino_interrupt_data {
      struct timeval timestamp;
      unsigned int frame_counter;
      unsigned int skip_count;
      unsigned int skip;
};

struct vino_channel_settings {
      unsigned int channel;

      int input;
      unsigned int data_format;
      unsigned int data_norm;
      struct vino_clipping clipping;
      unsigned int decimation;
      unsigned int line_size;
      unsigned int alpha;
      unsigned int fps;
      unsigned int framert_reg;

      unsigned int fifo_threshold;

      struct vino_framebuffer_queue fb_queue;

      /* number of the current field */
      unsigned int field;

      /* read in progress */
      int reading;
      /* streaming is active */
      int streaming;
      /* the driver is currently processing the queue */
      int capturing;

      struct mutex mutex;
      spinlock_t capture_lock;

      unsigned int users;

      struct vino_interrupt_data int_data;

      /* V4L support */
      struct video_device *v4l_device;
};

struct vino_client {
      /* the channel which owns this client:
       * VINO_NO_CHANNEL, VINO_CHANNEL_A or VINO_CHANNEL_B */
      unsigned int owner;
      struct i2c_client *driver;
};

struct vino_settings {
      struct vino_channel_settings a;
      struct vino_channel_settings b;

      struct vino_client decoder;
      struct vino_client camera;

      /* a lock for vino register access */
      spinlock_t vino_lock;
      /* a lock for channel input changes */
      spinlock_t input_lock;

      unsigned long dummy_page;
      struct vino_descriptor_table dummy_desc_table;
};

/* Module parameters */

/*
 * Using vino_pixel_conversion the ABGR32-format pixels supplied
 * by the VINO chip can be converted to more common formats
 * like RGBA32 (or probably RGB24 in the future). This way we
 * can give out data that can be specified correctly with
 * the V4L2-definitions.
 *
 * The pixel format is specified as RGBA32 when no conversion
 * is used.
 *
 * Note that this only affects the 32-bit bit depth.
 *
 * Use non-zero value to enable conversion.
 */
static int vino_pixel_conversion = 0;

module_param_named(pixelconv, vino_pixel_conversion, int, 0);

MODULE_PARM_DESC(pixelconv,
             "enable pixel conversion (non-zero value enables)");

/* Internal data structures */

static struct sgi_vino *vino;

static struct vino_settings *vino_drvdata;

static const char *vino_driver_name = "vino";
static const char *vino_driver_description = "SGI VINO";
static const char *vino_bus_name = "GIO64 bus";
static const char *vino_v4l_device_name_a = "SGI VINO Channel A";
static const char *vino_v4l_device_name_b = "SGI VINO Channel B";

static void vino_capture_tasklet(unsigned long channel);

DECLARE_TASKLET(vino_tasklet_a, vino_capture_tasklet, VINO_CHANNEL_A);
DECLARE_TASKLET(vino_tasklet_b, vino_capture_tasklet, VINO_CHANNEL_B);

static const struct vino_input vino_inputs[] = {
      {
            .name       = "Composite",
            .std        = V4L2_STD_NTSC | V4L2_STD_PAL
            | V4L2_STD_SECAM,
      },{
            .name       = "S-Video",
            .std        = V4L2_STD_NTSC | V4L2_STD_PAL
            | V4L2_STD_SECAM,
      },{
            .name       = "D1/IndyCam",
            .std        = V4L2_STD_NTSC,
      }
};

static const struct vino_data_format vino_data_formats[] = {
      {
            .description      = "8-bit greyscale",
            .bpp        = 1,
            .pixelformat      = V4L2_PIX_FMT_GREY,
            .colorspace = V4L2_COLORSPACE_SMPTE170M,
      },{
            .description      = "8-bit dithered RGB 3-3-2",
            .bpp        = 1,
            .pixelformat      = V4L2_PIX_FMT_RGB332,
            .colorspace = V4L2_COLORSPACE_SRGB,
      },{
            .description      = "32-bit RGB",
            .bpp        = 4,
            .pixelformat      = V4L2_PIX_FMT_RGB32,
            .colorspace = V4L2_COLORSPACE_SRGB,
      },{
            .description      = "YUV 4:2:2",
            .bpp        = 2,
            .pixelformat      = V4L2_PIX_FMT_YUYV, // XXX: swapped?
            .colorspace = V4L2_COLORSPACE_SMPTE170M,
      }
};

static const struct vino_data_norm vino_data_norms[] = {
      {
            .description      = "NTSC",
            .std        = V4L2_STD_NTSC,
            .fps_min    = 6,
            .fps_max    = 30,
            .framelines = 525,
            .width            = VINO_NTSC_WIDTH,
            .height           = VINO_NTSC_HEIGHT,
            .odd        = {
                  .top  = VINO_CLIPPING_START_ODD_NTSC,
                  .left = 0,
                  .bottom     = VINO_CLIPPING_START_ODD_NTSC
                  + VINO_NTSC_HEIGHT / 2 - 1,
                  .right      = VINO_NTSC_WIDTH,
            },
            .even       = {
                  .top  = VINO_CLIPPING_START_EVEN_NTSC,
                  .left = 0,
                  .bottom     = VINO_CLIPPING_START_EVEN_NTSC
                  + VINO_NTSC_HEIGHT / 2 - 1,
                  .right      = VINO_NTSC_WIDTH,
            },
      },{
            .description      = "PAL",
            .std        = V4L2_STD_PAL,
            .fps_min    = 5,
            .fps_max    = 25,
            .framelines = 625,
            .width            = VINO_PAL_WIDTH,
            .height           = VINO_PAL_HEIGHT,
            .odd        = {
                  .top  = VINO_CLIPPING_START_ODD_PAL,
                  .left = 0,
                  .bottom     = VINO_CLIPPING_START_ODD_PAL
                  + VINO_PAL_HEIGHT / 2 - 1,
                  .right      = VINO_PAL_WIDTH,
            },
            .even       = {
                  .top  = VINO_CLIPPING_START_EVEN_PAL,
                  .left = 0,
                  .bottom     = VINO_CLIPPING_START_EVEN_PAL
                  + VINO_PAL_HEIGHT / 2 - 1,
                  .right      = VINO_PAL_WIDTH,
            },
      },{
            .description      = "SECAM",
            .std        = V4L2_STD_SECAM,
            .fps_min    = 5,
            .fps_max    = 25,
            .framelines = 625,
            .width            = VINO_PAL_WIDTH,
            .height           = VINO_PAL_HEIGHT,
            .odd        = {
                  .top  = VINO_CLIPPING_START_ODD_PAL,
                  .left = 0,
                  .bottom     = VINO_CLIPPING_START_ODD_PAL
                  + VINO_PAL_HEIGHT / 2 - 1,
                  .right      = VINO_PAL_WIDTH,
            },
            .even       = {
                  .top  = VINO_CLIPPING_START_EVEN_PAL,
                  .left = 0,
                  .bottom     = VINO_CLIPPING_START_EVEN_PAL
                  + VINO_PAL_HEIGHT / 2 - 1,
                  .right      = VINO_PAL_WIDTH,
            },
      },{
            .description      = "NTSC/D1",
            .std        = V4L2_STD_NTSC,
            .fps_min    = 6,
            .fps_max    = 30,
            .framelines = 525,
            .width            = VINO_NTSC_WIDTH,
            .height           = VINO_NTSC_HEIGHT,
            .odd        = {
                  .top  = VINO_CLIPPING_START_ODD_D1,
                  .left = 0,
                  .bottom     = VINO_CLIPPING_START_ODD_D1
                  + VINO_NTSC_HEIGHT / 2 - 1,
                  .right      = VINO_NTSC_WIDTH,
            },
            .even       = {
                  .top  = VINO_CLIPPING_START_EVEN_D1,
                  .left = 0,
                  .bottom     = VINO_CLIPPING_START_EVEN_D1
                  + VINO_NTSC_HEIGHT / 2 - 1,
                  .right      = VINO_NTSC_WIDTH,
            },
      }
};

#define VINO_INDYCAM_V4L2_CONTROL_COUNT         9

struct v4l2_queryctrl vino_indycam_v4l2_controls[] = {
      {
            .id = V4L2_CID_AUTOGAIN,
            .type = V4L2_CTRL_TYPE_BOOLEAN,
            .name = "Automatic Gain Control",
            .minimum = 0,
            .maximum = 1,
            .step = 1,
            .default_value = INDYCAM_AGC_DEFAULT,
            .flags = 0,
            .reserved = { INDYCAM_CONTROL_AGC, 0 },
      },{
            .id = V4L2_CID_AUTO_WHITE_BALANCE,
            .type = V4L2_CTRL_TYPE_BOOLEAN,
            .name = "Automatic White Balance",
            .minimum = 0,
            .maximum = 1,
            .step = 1,
            .default_value = INDYCAM_AWB_DEFAULT,
            .flags = 0,
            .reserved = { INDYCAM_CONTROL_AWB, 0 },
      },{
            .id = V4L2_CID_GAIN,
            .type = V4L2_CTRL_TYPE_INTEGER,
            .name = "Gain",
            .minimum = INDYCAM_GAIN_MIN,
            .maximum = INDYCAM_GAIN_MAX,
            .step = 1,
            .default_value = INDYCAM_GAIN_DEFAULT,
            .flags = 0,
            .reserved = { INDYCAM_CONTROL_GAIN, 0 },
      },{
            .id = V4L2_CID_PRIVATE_BASE,
            .type = V4L2_CTRL_TYPE_INTEGER,
            .name = "Red Saturation",
            .minimum = INDYCAM_RED_SATURATION_MIN,
            .maximum = INDYCAM_RED_SATURATION_MAX,
            .step = 1,
            .default_value = INDYCAM_RED_SATURATION_DEFAULT,
            .flags = 0,
            .reserved = { INDYCAM_CONTROL_RED_SATURATION, 0 },
      },{
            .id = V4L2_CID_PRIVATE_BASE + 1,
            .type = V4L2_CTRL_TYPE_INTEGER,
            .name = "Blue Saturation",
            .minimum = INDYCAM_BLUE_SATURATION_MIN,
            .maximum = INDYCAM_BLUE_SATURATION_MAX,
            .step = 1,
            .default_value = INDYCAM_BLUE_SATURATION_DEFAULT,
            .flags = 0,
            .reserved = { INDYCAM_CONTROL_BLUE_SATURATION, 0 },
      },{
            .id = V4L2_CID_RED_BALANCE,
            .type = V4L2_CTRL_TYPE_INTEGER,
            .name = "Red Balance",
            .minimum = INDYCAM_RED_BALANCE_MIN,
            .maximum = INDYCAM_RED_BALANCE_MAX,
            .step = 1,
            .default_value = INDYCAM_RED_BALANCE_DEFAULT,
            .flags = 0,
            .reserved = { INDYCAM_CONTROL_RED_BALANCE, 0 },
      },{
            .id = V4L2_CID_BLUE_BALANCE,
            .type = V4L2_CTRL_TYPE_INTEGER,
            .name = "Blue Balance",
            .minimum = INDYCAM_BLUE_BALANCE_MIN,
            .maximum = INDYCAM_BLUE_BALANCE_MAX,
            .step = 1,
            .default_value = INDYCAM_BLUE_BALANCE_DEFAULT,
            .flags = 0,
            .reserved = { INDYCAM_CONTROL_BLUE_BALANCE, 0 },
      },{
            .id = V4L2_CID_EXPOSURE,
            .type = V4L2_CTRL_TYPE_INTEGER,
            .name = "Shutter Control",
            .minimum = INDYCAM_SHUTTER_MIN,
            .maximum = INDYCAM_SHUTTER_MAX,
            .step = 1,
            .default_value = INDYCAM_SHUTTER_DEFAULT,
            .flags = 0,
            .reserved = { INDYCAM_CONTROL_SHUTTER, 0 },
      },{
            .id = V4L2_CID_GAMMA,
            .type = V4L2_CTRL_TYPE_INTEGER,
            .name = "Gamma",
            .minimum = INDYCAM_GAMMA_MIN,
            .maximum = INDYCAM_GAMMA_MAX,
            .step = 1,
            .default_value = INDYCAM_GAMMA_DEFAULT,
            .flags = 0,
            .reserved = { INDYCAM_CONTROL_GAMMA, 0 },
      }
};

#define VINO_SAA7191_V4L2_CONTROL_COUNT         9

struct v4l2_queryctrl vino_saa7191_v4l2_controls[] = {
      {
            .id = V4L2_CID_HUE,
            .type = V4L2_CTRL_TYPE_INTEGER,
            .name = "Hue",
            .minimum = SAA7191_HUE_MIN,
            .maximum = SAA7191_HUE_MAX,
            .step = 1,
            .default_value = SAA7191_HUE_DEFAULT,
            .flags = 0,
            .reserved = { SAA7191_CONTROL_HUE, 0 },
      },{
            .id = V4L2_CID_PRIVATE_BASE,
            .type = V4L2_CTRL_TYPE_INTEGER,
            .name = "Luminance Bandpass",
            .minimum = SAA7191_BANDPASS_MIN,
            .maximum = SAA7191_BANDPASS_MAX,
            .step = 1,
            .default_value = SAA7191_BANDPASS_DEFAULT,
            .flags = 0,
            .reserved = { SAA7191_CONTROL_BANDPASS, 0 },
      },{
            .id = V4L2_CID_PRIVATE_BASE + 1,
            .type = V4L2_CTRL_TYPE_INTEGER,
            .name = "Luminance Bandpass Weight",
            .minimum = SAA7191_BANDPASS_WEIGHT_MIN,
            .maximum = SAA7191_BANDPASS_WEIGHT_MAX,
            .step = 1,
            .default_value = SAA7191_BANDPASS_WEIGHT_DEFAULT,
            .flags = 0,
            .reserved = { SAA7191_CONTROL_BANDPASS_WEIGHT, 0 },
      },{
            .id = V4L2_CID_PRIVATE_BASE + 2,
            .type = V4L2_CTRL_TYPE_INTEGER,
            .name = "HF Luminance Coring",
            .minimum = SAA7191_CORING_MIN,
            .maximum = SAA7191_CORING_MAX,
            .step = 1,
            .default_value = SAA7191_CORING_DEFAULT,
            .flags = 0,
            .reserved = { SAA7191_CONTROL_CORING, 0 },
      },{
            .id = V4L2_CID_PRIVATE_BASE + 3,
            .type = V4L2_CTRL_TYPE_BOOLEAN,
            .name = "Force Colour",
            .minimum = SAA7191_FORCE_COLOUR_MIN,
            .maximum = SAA7191_FORCE_COLOUR_MAX,
            .step = 1,
            .default_value = SAA7191_FORCE_COLOUR_DEFAULT,
            .flags = 0,
            .reserved = { SAA7191_CONTROL_FORCE_COLOUR, 0 },
      },{
            .id = V4L2_CID_PRIVATE_BASE + 4,
            .type = V4L2_CTRL_TYPE_INTEGER,
            .name = "Chrominance Gain Control",
            .minimum = SAA7191_CHROMA_GAIN_MIN,
            .maximum = SAA7191_CHROMA_GAIN_MAX,
            .step = 1,
            .default_value = SAA7191_CHROMA_GAIN_DEFAULT,
            .flags = 0,
            .reserved = { SAA7191_CONTROL_CHROMA_GAIN, 0 },
      },{
            .id = V4L2_CID_PRIVATE_BASE + 5,
            .type = V4L2_CTRL_TYPE_BOOLEAN,
            .name = "VTR Time Constant",
            .minimum = SAA7191_VTRC_MIN,
            .maximum = SAA7191_VTRC_MAX,
            .step = 1,
            .default_value = SAA7191_VTRC_DEFAULT,
            .flags = 0,
            .reserved = { SAA7191_CONTROL_VTRC, 0 },
      },{
            .id = V4L2_CID_PRIVATE_BASE + 6,
            .type = V4L2_CTRL_TYPE_INTEGER,
            .name = "Luminance Delay Compensation",
            .minimum = SAA7191_LUMA_DELAY_MIN,
            .maximum = SAA7191_LUMA_DELAY_MAX,
            .step = 1,
            .default_value = SAA7191_LUMA_DELAY_DEFAULT,
            .flags = 0,
            .reserved = { SAA7191_CONTROL_LUMA_DELAY, 0 },
      },{
            .id = V4L2_CID_PRIVATE_BASE + 7,
            .type = V4L2_CTRL_TYPE_INTEGER,
            .name = "Vertical Noise Reduction",
            .minimum = SAA7191_VNR_MIN,
            .maximum = SAA7191_VNR_MAX,
            .step = 1,
            .default_value = SAA7191_VNR_DEFAULT,
            .flags = 0,
            .reserved = { SAA7191_CONTROL_VNR, 0 },
      }
};

/* VINO I2C bus functions */

unsigned i2c_vino_getctrl(void *data)
{
      return vino->i2c_control;
}

void i2c_vino_setctrl(void *data, unsigned val)
{
      vino->i2c_control = val;
}

unsigned i2c_vino_rdata(void *data)
{
      return vino->i2c_data;
}

void i2c_vino_wdata(void *data, unsigned val)
{
      vino->i2c_data = val;
}

static struct i2c_algo_sgi_data i2c_sgi_vino_data =
{
      .getctrl = &i2c_vino_getctrl,
      .setctrl = &i2c_vino_setctrl,
      .rdata   = &i2c_vino_rdata,
      .wdata   = &i2c_vino_wdata,
      .xfer_timeout = 200,
      .ack_timeout  = 1000,
};

/*
 * There are two possible clients on VINO I2C bus, so we limit usage only
 * to them.
 */
static int i2c_vino_client_reg(struct i2c_client *client)
{
      unsigned long flags;
      int ret = 0;

      spin_lock_irqsave(&vino_drvdata->input_lock, flags);
      switch (client->driver->id) {
      case I2C_DRIVERID_SAA7191:
            if (vino_drvdata->decoder.driver)
                  ret = -EBUSY;
            else
                  vino_drvdata->decoder.driver = client;
            break;
      case I2C_DRIVERID_INDYCAM:
            if (vino_drvdata->camera.driver)
                  ret = -EBUSY;
            else
                  vino_drvdata->camera.driver = client;
            break;
      default:
            ret = -ENODEV;
      }
      spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

      return ret;
}

static int i2c_vino_client_unreg(struct i2c_client *client)
{
      unsigned long flags;
      int ret = 0;

      spin_lock_irqsave(&vino_drvdata->input_lock, flags);
      if (client == vino_drvdata->decoder.driver) {
            if (vino_drvdata->decoder.owner != VINO_NO_CHANNEL)
                  ret = -EBUSY;
            else
                  vino_drvdata->decoder.driver = NULL;
      } else if (client == vino_drvdata->camera.driver) {
            if (vino_drvdata->camera.owner != VINO_NO_CHANNEL)
                  ret = -EBUSY;
            else
                  vino_drvdata->camera.driver = NULL;
      }
      spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

      return ret;
}

static struct i2c_adapter vino_i2c_adapter =
{
      .name             = "VINO I2C bus",
      .id               = I2C_HW_SGI_VINO,
      .algo_data        = &i2c_sgi_vino_data,
      .client_register  = &i2c_vino_client_reg,
      .client_unregister      = &i2c_vino_client_unreg,
};

static int vino_i2c_add_bus(void)
{
      return i2c_sgi_add_bus(&vino_i2c_adapter);
}

static int vino_i2c_del_bus(void)
{
      return i2c_del_adapter(&vino_i2c_adapter);
}

static int i2c_camera_command(unsigned int cmd, void *arg)
{
      return vino_drvdata->camera.driver->
            driver->command(vino_drvdata->camera.driver,
                        cmd, arg);
}

static int i2c_decoder_command(unsigned int cmd, void *arg)
{
      return vino_drvdata->decoder.driver->
            driver->command(vino_drvdata->decoder.driver,
                        cmd, arg);
}

/* VINO framebuffer/DMA descriptor management */

static void vino_free_buffer_with_count(struct vino_framebuffer *fb,
                                     unsigned int count)
{
      unsigned int i;

      dprintk("vino_free_buffer_with_count(): count = %d\n", count);

      for (i = 0; i < count; i++) {
            ClearPageReserved(virt_to_page(fb->desc_table.virtual[i]));
            dma_unmap_single(NULL,
                         fb->desc_table.dma_cpu[VINO_PAGE_RATIO * i],
                         PAGE_SIZE, DMA_FROM_DEVICE);
            free_page(fb->desc_table.virtual[i]);
      }

      dma_free_coherent(NULL,
                    VINO_PAGE_RATIO * (fb->desc_table.page_count + 4) *
                    sizeof(dma_addr_t), (void *)fb->desc_table.dma_cpu,
                    fb->desc_table.dma);
      kfree(fb->desc_table.virtual);

      memset(fb, 0, sizeof(struct vino_framebuffer));
}

static void vino_free_buffer(struct vino_framebuffer *fb)
{
      vino_free_buffer_with_count(fb, fb->desc_table.page_count);
}

static int vino_allocate_buffer(struct vino_framebuffer *fb,
                        unsigned int size)
{
      unsigned int count, i, j;
      int ret = 0;

      dprintk("vino_allocate_buffer():\n");

      if (size < 1)
            return -EINVAL;

      memset(fb, 0, sizeof(struct vino_framebuffer));

      count = ((size / PAGE_SIZE) + 4) & ~3;

      dprintk("vino_allocate_buffer(): size = %d, count = %d\n",
            size, count);

      /* allocate memory for table with virtual (page) addresses */
      fb->desc_table.virtual = (unsigned long *)
            kmalloc(count * sizeof(unsigned long), GFP_KERNEL);
      if (!fb->desc_table.virtual)
            return -ENOMEM;

      /* allocate memory for table with dma addresses
       * (has space for four extra descriptors) */
      fb->desc_table.dma_cpu =
            dma_alloc_coherent(NULL, VINO_PAGE_RATIO * (count + 4) *
                           sizeof(dma_addr_t), &fb->desc_table.dma,
                           GFP_KERNEL | GFP_DMA);
      if (!fb->desc_table.dma_cpu) {
            ret = -ENOMEM;
            goto out_free_virtual;
      }

      /* allocate pages for the buffer and acquire the according
       * dma addresses */
      for (i = 0; i < count; i++) {
            dma_addr_t dma_data_addr;

            fb->desc_table.virtual[i] =
                  get_zeroed_page(GFP_KERNEL | GFP_DMA);
            if (!fb->desc_table.virtual[i]) {
                  ret = -ENOBUFS;
                  break;
            }

            dma_data_addr =
                  dma_map_single(NULL,
                               (void *)fb->desc_table.virtual[i],
                               PAGE_SIZE, DMA_FROM_DEVICE);

            for (j = 0; j < VINO_PAGE_RATIO; j++) {
                  fb->desc_table.dma_cpu[VINO_PAGE_RATIO * i + j] =
                        dma_data_addr + VINO_PAGE_SIZE * j;
            }

            SetPageReserved(virt_to_page(fb->desc_table.virtual[i]));
      }

      /* page_count needs to be set anyway, because the descriptor table has
       * been allocated according to this number */
      fb->desc_table.page_count = count;

      if (ret) {
            /* the descriptor with index i doesn't contain
             * a valid address yet */
            vino_free_buffer_with_count(fb, i);
            return ret;
      }

      //fb->size = size;
      fb->size = count * PAGE_SIZE;
      fb->data_format = VINO_DATA_FMT_NONE;

      /* set the dma stop-bit for the last (count+1)th descriptor */
      fb->desc_table.dma_cpu[VINO_PAGE_RATIO * count] = VINO_DESC_STOP;
      return 0;

 out_free_virtual:
      kfree(fb->desc_table.virtual);
      return ret;
}

#if 0
/* user buffers not fully implemented yet */
static int vino_prepare_user_buffer(struct vino_framebuffer *fb,
                             void *user,
                             unsigned int size)
{
      unsigned int count, i, j;
      int ret = 0;

      dprintk("vino_prepare_user_buffer():\n");

      if (size < 1)
            return -EINVAL;

      memset(fb, 0, sizeof(struct vino_framebuffer));

      count = ((size / PAGE_SIZE)) & ~3;

      dprintk("vino_prepare_user_buffer(): size = %d, count = %d\n",
            size, count);

      /* allocate memory for table with virtual (page) addresses */
      fb->desc_table.virtual = (unsigned long *)
            kmalloc(count * sizeof(unsigned long), GFP_KERNEL);
      if (!fb->desc_table.virtual)
            return -ENOMEM;

      /* allocate memory for table with dma addresses
       * (has space for four extra descriptors) */
      fb->desc_table.dma_cpu =
            dma_alloc_coherent(NULL, VINO_PAGE_RATIO * (count + 4) *
                           sizeof(dma_addr_t), &fb->desc_table.dma,
                           GFP_KERNEL | GFP_DMA);
      if (!fb->desc_table.dma_cpu) {
            ret = -ENOMEM;
            goto out_free_virtual;
      }

      /* allocate pages for the buffer and acquire the according
       * dma addresses */
      for (i = 0; i < count; i++) {
            dma_addr_t dma_data_addr;

            fb->desc_table.virtual[i] =
                  get_zeroed_page(GFP_KERNEL | GFP_DMA);
            if (!fb->desc_table.virtual[i]) {
                  ret = -ENOBUFS;
                  break;
            }

            dma_data_addr =
                  dma_map_single(NULL,
                               (void *)fb->desc_table.virtual[i],
                               PAGE_SIZE, DMA_FROM_DEVICE);

            for (j = 0; j < VINO_PAGE_RATIO; j++) {
                  fb->desc_table.dma_cpu[VINO_PAGE_RATIO * i + j] =
                        dma_data_addr + VINO_PAGE_SIZE * j;
            }

            SetPageReserved(virt_to_page(fb->desc_table.virtual[i]));
      }

      /* page_count needs to be set anyway, because the descriptor table has
       * been allocated according to this number */
      fb->desc_table.page_count = count;

      if (ret) {
            /* the descriptor with index i doesn't contain
             * a valid address yet */
            vino_free_buffer_with_count(fb, i);
            return ret;
      }

      //fb->size = size;
      fb->size = count * PAGE_SIZE;

      /* set the dma stop-bit for the last (count+1)th descriptor */
      fb->desc_table.dma_cpu[VINO_PAGE_RATIO * count] = VINO_DESC_STOP;
      return 0;

 out_free_virtual:
      kfree(fb->desc_table.virtual);
      return ret;
}
#endif

static void vino_sync_buffer(struct vino_framebuffer *fb)
{
      int i;

      dprintk("vino_sync_buffer():\n");

      for (i = 0; i < fb->desc_table.page_count; i++)
            dma_sync_single(NULL,
                        fb->desc_table.dma_cpu[VINO_PAGE_RATIO * i],
                        PAGE_SIZE, DMA_FROM_DEVICE);
}

/* Framebuffer fifo functions (need to be locked externally) */

static inline void vino_fifo_init(struct vino_framebuffer_fifo *f,
                     unsigned int length)
{
      f->length = 0;
      f->used = 0;
      f->head = 0;
      f->tail = 0;

      if (length > VINO_FRAMEBUFFER_COUNT_MAX)
            length = VINO_FRAMEBUFFER_COUNT_MAX;

      f->length = length;
}

/* returns true/false */
static inline int vino_fifo_has_id(struct vino_framebuffer_fifo *f,
                           unsigned int id)
{
      unsigned int i;

      for (i = f->head; i == (f->tail - 1); i = (i + 1) % f->length) {
            if (f->data[i] == id)
                  return 1;
      }

      return 0;
}

#if 0
/* returns true/false */
static inline int vino_fifo_full(struct vino_framebuffer_fifo *f)
{
      return (f->used == f->length);
}
#endif

static inline unsigned int vino_fifo_get_used(struct vino_framebuffer_fifo *f)
{
      return f->used;
}

static int vino_fifo_enqueue(struct vino_framebuffer_fifo *f, unsigned int id)
{
      if (id >= f->length) {
            return VINO_QUEUE_ERROR;
      }

      if (vino_fifo_has_id(f, id)) {
            return VINO_QUEUE_ERROR;
      }

      if (f->used < f->length) {
            f->data[f->tail] = id;
            f->tail = (f->tail + 1) % f->length;
            f->used++;
      } else {
            return VINO_QUEUE_ERROR;
      }

      return 0;
}

static int vino_fifo_peek(struct vino_framebuffer_fifo *f, unsigned int *id)
{
      if (f->used > 0) {
            *id = f->data[f->head];
      } else {
            return VINO_QUEUE_ERROR;
      }

      return 0;
}

static int vino_fifo_dequeue(struct vino_framebuffer_fifo *f, unsigned int *id)
{
      if (f->used > 0) {
            *id = f->data[f->head];
            f->head = (f->head + 1) % f->length;
            f->used--;
      } else {
            return VINO_QUEUE_ERROR;
      }

      return 0;
}

/* Framebuffer queue functions */

/* execute with queue_lock locked */
static void vino_queue_free_with_count(struct vino_framebuffer_queue *q,
                               unsigned int length)
{
      unsigned int i;

      q->length = 0;
      memset(&q->in, 0, sizeof(struct vino_framebuffer_fifo));
      memset(&q->out, 0, sizeof(struct vino_framebuffer_fifo));
      for (i = 0; i < length; i++) {
            dprintk("vino_queue_free_with_count(): freeing buffer %d\n",
                  i);
            vino_free_buffer(q->buffer[i]);
            kfree(q->buffer[i]);
      }

      q->type = VINO_MEMORY_NONE;
      q->magic = 0;
}

static void vino_queue_free(struct vino_framebuffer_queue *q)
{
      dprintk("vino_queue_free():\n");

      if (q->magic != VINO_QUEUE_MAGIC)
            return;
      if (q->type != VINO_MEMORY_MMAP)
            return;

      mutex_lock(&q->queue_mutex);

      vino_queue_free_with_count(q, q->length);

      mutex_unlock(&q->queue_mutex);
}

static int vino_queue_init(struct vino_framebuffer_queue *q,
                     unsigned int *length)
{
      unsigned int i;
      int ret = 0;

      dprintk("vino_queue_init(): length = %d\n", *length);

      if (q->magic == VINO_QUEUE_MAGIC) {
            dprintk("vino_queue_init(): queue already initialized!\n");
            return -EINVAL;
      }

      if (q->type != VINO_MEMORY_NONE) {
            dprintk("vino_queue_init(): queue already initialized!\n");
            return -EINVAL;
      }

      if (*length < 1)
            return -EINVAL;

      mutex_lock(&q->queue_mutex);

      if (*length > VINO_FRAMEBUFFER_COUNT_MAX)
            *length = VINO_FRAMEBUFFER_COUNT_MAX;

      q->length = 0;

      for (i = 0; i < *length; i++) {
            dprintk("vino_queue_init(): allocating buffer %d\n", i);
            q->buffer[i] = kmalloc(sizeof(struct vino_framebuffer),
                               GFP_KERNEL);
            if (!q->buffer[i]) {
                  dprintk("vino_queue_init(): kmalloc() failed\n");
                  ret = -ENOMEM;
                  break;
            }

            ret = vino_allocate_buffer(q->buffer[i],
                                 VINO_FRAMEBUFFER_SIZE);
            if (ret) {
                  kfree(q->buffer[i]);
                  dprintk("vino_queue_init(): "
                        "vino_allocate_buffer() failed\n");
                  break;
            }

            q->buffer[i]->id = i;
            if (i > 0) {
                  q->buffer[i]->offset = q->buffer[i - 1]->offset +
                        q->buffer[i - 1]->size;
            } else {
                  q->buffer[i]->offset = 0;
            }

            spin_lock_init(&q->buffer[i]->state_lock);

            dprintk("vino_queue_init(): buffer = %d, offset = %d, "
                  "size = %d\n", i, q->buffer[i]->offset,
                  q->buffer[i]->size);
      }

      if (ret) {
            vino_queue_free_with_count(q, i);
            *length = 0;
      } else {
            q->length = *length;
            vino_fifo_init(&q->in, q->length);
            vino_fifo_init(&q->out, q->length);
            q->type = VINO_MEMORY_MMAP;
            q->magic = VINO_QUEUE_MAGIC;
      }

      mutex_unlock(&q->queue_mutex);

      return ret;
}

static struct vino_framebuffer *vino_queue_add(struct
                                     vino_framebuffer_queue *q,
                                     unsigned int id)
{
      struct vino_framebuffer *ret = NULL;
      unsigned int total;
      unsigned long flags;

      dprintk("vino_queue_add(): id = %d\n", id);

      if (q->magic != VINO_QUEUE_MAGIC) {
            return ret;
      }

      spin_lock_irqsave(&q->queue_lock, flags);

      if (q->length == 0)
            goto out;

      if (id >= q->length)
            goto out;

      /* not needed?: if (vino_fifo_full(&q->out)) {
            goto out;
            }*/
      /* check that outgoing queue isn't already full
       * (or that it won't become full) */
      total = vino_fifo_get_used(&q->in) +
            vino_fifo_get_used(&q->out);
      if (total >= q->length)
            goto out;

      if (vino_fifo_enqueue(&q->in, id))
            goto out;

      ret = q->buffer[id];

out:
      spin_unlock_irqrestore(&q->queue_lock, flags);

      return ret;
}

static struct vino_framebuffer *vino_queue_transfer(struct
                                        vino_framebuffer_queue *q)
{
      struct vino_framebuffer *ret = NULL;
      struct vino_framebuffer *fb;
      int id;
      unsigned long flags;

      dprintk("vino_queue_transfer():\n");

      if (q->magic != VINO_QUEUE_MAGIC) {
            return ret;
      }

      spin_lock_irqsave(&q->queue_lock, flags);

      if (q->length == 0)
            goto out;

      // now this actually removes an entry from the incoming queue
      if (vino_fifo_dequeue(&q->in, &id)) {
            goto out;
      }

      dprintk("vino_queue_transfer(): id = %d\n", id);
      fb = q->buffer[id];

      // we have already checked that the outgoing queue is not full, but...
      if (vino_fifo_enqueue(&q->out, id)) {
            printk(KERN_ERR "vino_queue_transfer(): "
                   "outgoing queue is full, this shouldn't happen!\n");
            goto out;
      }

      ret = fb;
out:
      spin_unlock_irqrestore(&q->queue_lock, flags);

      return ret;
}

/* returns true/false */
static int vino_queue_incoming_contains(struct vino_framebuffer_queue *q,
                              unsigned int id)
{
      int ret = 0;
      unsigned long flags;

      if (q->magic != VINO_QUEUE_MAGIC) {
            return ret;
      }

      spin_lock_irqsave(&q->queue_lock, flags);

      if (q->length == 0)
            goto out;

      ret = vino_fifo_has_id(&q->in, id);

out:
      spin_unlock_irqrestore(&q->queue_lock, flags);

      return ret;
}

/* returns true/false */
static int vino_queue_outgoing_contains(struct vino_framebuffer_queue *q,
                              unsigned int id)
{
      int ret = 0;
      unsigned long flags;

      if (q->magic != VINO_QUEUE_MAGIC) {
            return ret;
      }

      spin_lock_irqsave(&q->queue_lock, flags);

      if (q->length == 0)
            goto out;

      ret = vino_fifo_has_id(&q->out, id);

out:
      spin_unlock_irqrestore(&q->queue_lock, flags);

      return ret;
}

static int vino_queue_get_incoming(struct vino_framebuffer_queue *q,
                           unsigned int *used)
{
      int ret = 0;
      unsigned long flags;

      if (q->magic != VINO_QUEUE_MAGIC) {
            return VINO_QUEUE_ERROR;
      }

      spin_lock_irqsave(&q->queue_lock, flags);

      if (q->length == 0) {
            ret = VINO_QUEUE_ERROR;
            goto out;
      }

      *used = vino_fifo_get_used(&q->in);

out:
      spin_unlock_irqrestore(&q->queue_lock, flags);

      return ret;
}

static int vino_queue_get_outgoing(struct vino_framebuffer_queue *q,
                           unsigned int *used)
{
      int ret = 0;
      unsigned long flags;

      if (q->magic != VINO_QUEUE_MAGIC) {
            return VINO_QUEUE_ERROR;
      }

      spin_lock_irqsave(&q->queue_lock, flags);

      if (q->length == 0) {
            ret = VINO_QUEUE_ERROR;
            goto out;
      }

      *used = vino_fifo_get_used(&q->out);

out:
      spin_unlock_irqrestore(&q->queue_lock, flags);

      return ret;
}

#if 0
static int vino_queue_get_total(struct vino_framebuffer_queue *q,
                        unsigned int *total)
{
      int ret = 0;
      unsigned long flags;

      if (q->magic != VINO_QUEUE_MAGIC) {
            return VINO_QUEUE_ERROR;
      }

      spin_lock_irqsave(&q->queue_lock, flags);

      if (q->length == 0) {
            ret = VINO_QUEUE_ERROR;
            goto out;
      }

      *total = vino_fifo_get_used(&q->in) +
            vino_fifo_get_used(&q->out);

out:
      spin_unlock_irqrestore(&q->queue_lock, flags);

      return ret;
}
#endif

static struct vino_framebuffer *vino_queue_peek(struct
                                    vino_framebuffer_queue *q,
                                    unsigned int *id)
{
      struct vino_framebuffer *ret = NULL;
      unsigned long flags;

      if (q->magic != VINO_QUEUE_MAGIC) {
            return ret;
      }

      spin_lock_irqsave(&q->queue_lock, flags);

      if (q->length == 0)
            goto out;

      if (vino_fifo_peek(&q->in, id)) {
            goto out;
      }

      ret = q->buffer[*id];
out:
      spin_unlock_irqrestore(&q->queue_lock, flags);

      return ret;
}

static struct vino_framebuffer *vino_queue_remove(struct
                                      vino_framebuffer_queue *q,
                                      unsigned int *id)
{
      struct vino_framebuffer *ret = NULL;
      unsigned long flags;
      dprintk("vino_queue_remove():\n");

      if (q->magic != VINO_QUEUE_MAGIC) {
            return ret;
      }

      spin_lock_irqsave(&q->queue_lock, flags);

      if (q->length == 0)
            goto out;

      if (vino_fifo_dequeue(&q->out, id)) {
            goto out;
      }

      dprintk("vino_queue_remove(): id = %d\n", *id);
      ret = q->buffer[*id];
out:
      spin_unlock_irqrestore(&q->queue_lock, flags);

      return ret;
}

static struct
vino_framebuffer *vino_queue_get_buffer(struct vino_framebuffer_queue *q,
                              unsigned int id)
{
      struct vino_framebuffer *ret = NULL;
      unsigned long flags;

      if (q->magic != VINO_QUEUE_MAGIC) {
            return ret;
      }

      spin_lock_irqsave(&q->queue_lock, flags);

      if (q->length == 0)
            goto out;

      if (id >= q->length)
            goto out;

      ret = q->buffer[id];
 out:
      spin_unlock_irqrestore(&q->queue_lock, flags);

      return ret;
}

static unsigned int vino_queue_get_length(struct vino_framebuffer_queue *q)
{
      unsigned int length = 0;
      unsigned long flags;

      if (q->magic != VINO_QUEUE_MAGIC) {
            return length;
      }

      spin_lock_irqsave(&q->queue_lock, flags);
      length = q->length;
      spin_unlock_irqrestore(&q->queue_lock, flags);

      return length;
}

static int vino_queue_has_mapped_buffers(struct vino_framebuffer_queue *q)
{
      unsigned int i;
      int ret = 0;
      unsigned long flags;

      if (q->magic != VINO_QUEUE_MAGIC) {
            return ret;
      }

      spin_lock_irqsave(&q->queue_lock, flags);
      for (i = 0; i < q->length; i++) {
            if (q->buffer[i]->map_count > 0) {
                  ret = 1;
                  break;
            }
      }
      spin_unlock_irqrestore(&q->queue_lock, flags);

      return ret;
}

/* VINO functions */

/* execute with input_lock locked */
static void vino_update_line_size(struct vino_channel_settings *vcs)
{
      unsigned int w = vcs->clipping.right - vcs->clipping.left;
      unsigned int d = vcs->decimation;
      unsigned int bpp = vino_data_formats[vcs->data_format].bpp;
      unsigned int lsize;

      dprintk("update_line_size(): before: w = %d, d = %d, "
            "line_size = %d\n", w, d, vcs->line_size);

      /* line size must be multiple of 8 bytes */
      lsize = (bpp * (w / d)) & ~7;
      w = (lsize / bpp) * d;

      vcs->clipping.right = vcs->clipping.left + w;
      vcs->line_size = lsize;

      dprintk("update_line_size(): after: w = %d, d = %d, "
            "line_size = %d\n", w, d, vcs->line_size);
}

/* execute with input_lock locked */
static void vino_set_clipping(struct vino_channel_settings *vcs,
                        unsigned int x, unsigned int y,
                        unsigned int w, unsigned int h)
{
      unsigned int maxwidth, maxheight;
      unsigned int d;

      maxwidth = vino_data_norms[vcs->data_norm].width;
      maxheight = vino_data_norms[vcs->data_norm].height;
      d = vcs->decimation;

      y &= ~1;    /* odd/even fields */

      if (x > maxwidth) {
            x = 0;
      }
      if (y > maxheight) {
            y = 0;
      }

      if (((w / d) < VINO_MIN_WIDTH)
          || ((h / d) < VINO_MIN_HEIGHT)) {
            w = VINO_MIN_WIDTH * d;
            h = VINO_MIN_HEIGHT * d;
      }

      if ((x + w) > maxwidth) {
            w = maxwidth - x;
            if ((w / d) < VINO_MIN_WIDTH)
                  x = maxwidth - VINO_MIN_WIDTH * d;
      }
      if ((y + h) > maxheight) {
            h = maxheight - y;
            if ((h / d) < VINO_MIN_HEIGHT)
                  y = maxheight - VINO_MIN_HEIGHT * d;
      }

      vcs->clipping.left = x;
      vcs->clipping.top = y;
      vcs->clipping.right = x + w;
      vcs->clipping.bottom = y + h;

      vino_update_line_size(vcs);

      dprintk("clipping %d, %d, %d, %d / %d - %d\n",
            vcs->clipping.left, vcs->clipping.top, vcs->clipping.right,
            vcs->clipping.bottom, vcs->decimation, vcs->line_size);
}

/* execute with input_lock locked */
static inline void vino_set_default_clipping(struct vino_channel_settings *vcs)
{
      vino_set_clipping(vcs, 0, 0, vino_data_norms[vcs->data_norm].width,
                    vino_data_norms[vcs->data_norm].height);
}

/* execute with input_lock locked */
static void vino_set_scaling(struct vino_channel_settings *vcs,
                       unsigned int w, unsigned int h)
{
      unsigned int x, y, curw, curh, d;

      x = vcs->clipping.left;
      y = vcs->clipping.top;
      curw = vcs->clipping.right - vcs->clipping.left;
      curh = vcs->clipping.bottom - vcs->clipping.top;

      d = max(curw / w, curh / h);

      dprintk("scaling w: %d, h: %d, curw: %d, curh: %d, d: %d\n",
            w, h, curw, curh, d);

      if (d < 1) {
            d = 1;
      } else if (d > 8) {
            d = 8;
      }

      vcs->decimation = d;
      vino_set_clipping(vcs, x, y, w * d, h * d);

      dprintk("scaling %d, %d, %d, %d / %d - %d\n", vcs->clipping.left,
            vcs->clipping.top, vcs->clipping.right, vcs->clipping.bottom,
            vcs->decimation, vcs->line_size);
}

/* execute with input_lock locked */
static inline void vino_set_default_scaling(struct vino_channel_settings *vcs)
{
      vino_set_scaling(vcs, vcs->clipping.right - vcs->clipping.left,
                   vcs->clipping.bottom - vcs->clipping.top);
}

/* execute with input_lock locked */
static void vino_set_framerate(struct vino_channel_settings *vcs,
                         unsigned int fps)
{
      unsigned int mask;

      switch (vcs->data_norm) {
      case VINO_DATA_NORM_NTSC:
      case VINO_DATA_NORM_D1:
            fps = (unsigned int)(fps / 6) * 6; // FIXME: round!

            if (fps < vino_data_norms[vcs->data_norm].fps_min)
                  fps = vino_data_norms[vcs->data_norm].fps_min;
            if (fps > vino_data_norms[vcs->data_norm].fps_max)
                  fps = vino_data_norms[vcs->data_norm].fps_max;

            switch (fps) {
            case 6:
                  mask = 0x003;
                  break;
            case 12:
                  mask = 0x0c3;
                  break;
            case 18:
                  mask = 0x333;
                  break;
            case 24:
                  mask = 0x3ff;
                  break;
            case 30:
                  mask = 0xfff;
                  break;
            default:
                  mask = VINO_FRAMERT_FULL;
            }
            vcs->framert_reg = VINO_FRAMERT_RT(mask);
            break;
      case VINO_DATA_NORM_PAL:
      case VINO_DATA_NORM_SECAM:
            fps = (unsigned int)(fps / 5) * 5; // FIXME: round!

            if (fps < vino_data_norms[vcs->data_norm].fps_min)
                  fps = vino_data_norms[vcs->data_norm].fps_min;
            if (fps > vino_data_norms[vcs->data_norm].fps_max)
                  fps = vino_data_norms[vcs->data_norm].fps_max;

            switch (fps) {
            case 5:
                  mask = 0x003;
                  break;
            case 10:
                  mask = 0x0c3;
                  break;
            case 15:
                  mask = 0x333;
                  break;
            case 20:
                  mask = 0x0ff;
                  break;
            case 25:
                  mask = 0x3ff;
                  break;
            default:
                  mask = VINO_FRAMERT_FULL;
            }
            vcs->framert_reg = VINO_FRAMERT_RT(mask) | VINO_FRAMERT_PAL;
            break;
      }

      vcs->fps = fps;
}

/* execute with input_lock locked */
static inline void vino_set_default_framerate(struct
                                    vino_channel_settings *vcs)
{
      vino_set_framerate(vcs, vino_data_norms[vcs->data_norm].fps_max);
}

/*
 * Prepare VINO for DMA transfer...
 * (execute only with vino_lock and input_lock locked)
 */
static int vino_dma_setup(struct vino_channel_settings *vcs,
                    struct vino_framebuffer *fb)
{
      u32 ctrl, intr;
      struct sgi_vino_channel *ch;
      const struct vino_data_norm *norm;

      dprintk("vino_dma_setup():\n");

      vcs->field = 0;
      fb->frame_counter = 0;

      ch = (vcs->channel == VINO_CHANNEL_A) ? &vino->a : &vino->b;
      norm = &vino_data_norms[vcs->data_norm];

      ch->page_index = 0;
      ch->line_count = 0;

      /* VINO line size register is set 8 bytes less than actual */
      ch->line_size = vcs->line_size - 8;

      /* let VINO know where to transfer data */
      ch->start_desc_tbl = fb->desc_table.dma;
      ch->next_4_desc = fb->desc_table.dma;

      /* give vino time to fetch the first four descriptors, 5 usec
       * should be more than enough time */
      udelay(VINO_DESC_FETCH_DELAY);

      dprintk("vino_dma_setup(): start desc = %08x, next 4 desc = %08x\n",
            ch->start_desc_tbl, ch->next_4_desc);

      /* set the alpha register */
      ch->alpha = vcs->alpha;

      /* set clipping registers */
      ch->clip_start = VINO_CLIP_ODD(norm->odd.top + vcs->clipping.top / 2) |
            VINO_CLIP_EVEN(norm->even.top +
                         vcs->clipping.top / 2) |
            VINO_CLIP_X(vcs->clipping.left);
      ch->clip_end = VINO_CLIP_ODD(norm->odd.top +
                             vcs->clipping.bottom / 2 - 1) |
            VINO_CLIP_EVEN(norm->even.top +
                         vcs->clipping.bottom / 2 - 1) |
            VINO_CLIP_X(vcs->clipping.right);

      /* set the size of actual content in the buffer (DECIMATION !) */
      fb->data_size = ((vcs->clipping.right - vcs->clipping.left) /
                   vcs->decimation) *
            ((vcs->clipping.bottom - vcs->clipping.top) /
             vcs->decimation) *
            vino_data_formats[vcs->data_format].bpp;

      ch->frame_rate = vcs->framert_reg;

      ctrl = vino->control;
      intr = vino->intr_status;

      if (vcs->channel == VINO_CHANNEL_A) {
            /* All interrupt conditions for this channel was cleared
             * so clear the interrupt status register and enable
             * interrupts */
            intr &=     ~VINO_INTSTAT_A;
            ctrl |= VINO_CTRL_A_INT;

            /* enable synchronization */
            ctrl |= VINO_CTRL_A_SYNC_ENBL;

            /* enable frame assembly */
            ctrl |= VINO_CTRL_A_INTERLEAVE_ENBL;

            /* set decimation used */
            if (vcs->decimation < 2)
                  ctrl &= ~VINO_CTRL_A_DEC_ENBL;
            else {
                  ctrl |= VINO_CTRL_A_DEC_ENBL;
                  ctrl &= ~VINO_CTRL_A_DEC_SCALE_MASK;
                  ctrl |= (vcs->decimation - 1) <<
                        VINO_CTRL_A_DEC_SCALE_SHIFT;
            }

            /* select input interface */
            if (vcs->input == VINO_INPUT_D1)
                  ctrl |= VINO_CTRL_A_SELECT;
            else
                  ctrl &= ~VINO_CTRL_A_SELECT;

            /* palette */
            ctrl &= ~(VINO_CTRL_A_LUMA_ONLY | VINO_CTRL_A_RGB |
                    VINO_CTRL_A_DITHER);
      } else {
            intr &= ~VINO_INTSTAT_B;
            ctrl |= VINO_CTRL_B_INT;

            ctrl |= VINO_CTRL_B_SYNC_ENBL;
            ctrl |= VINO_CTRL_B_INTERLEAVE_ENBL;

            if (vcs->decimation < 2)
                  ctrl &= ~VINO_CTRL_B_DEC_ENBL;
            else {
                  ctrl |= VINO_CTRL_B_DEC_ENBL;
                  ctrl &= ~VINO_CTRL_B_DEC_SCALE_MASK;
                  ctrl |= (vcs->decimation - 1) <<
                        VINO_CTRL_B_DEC_SCALE_SHIFT;

            }
            if (vcs->input == VINO_INPUT_D1)
                  ctrl |= VINO_CTRL_B_SELECT;
            else
                  ctrl &= ~VINO_CTRL_B_SELECT;

            ctrl &= ~(VINO_CTRL_B_LUMA_ONLY | VINO_CTRL_B_RGB |
                    VINO_CTRL_B_DITHER);
      }

      /* set palette */
      fb->data_format = vcs->data_format;

      switch (vcs->data_format) {
            case VINO_DATA_FMT_GREY:
                  ctrl |= (vcs->channel == VINO_CHANNEL_A) ?
                        VINO_CTRL_A_LUMA_ONLY : VINO_CTRL_B_LUMA_ONLY;
                  break;
            case VINO_DATA_FMT_RGB32:
                  ctrl |= (vcs->channel == VINO_CHANNEL_A) ?
                        VINO_CTRL_A_RGB : VINO_CTRL_B_RGB;
                  break;
            case VINO_DATA_FMT_YUV:
                  /* nothing needs to be done */
                  break;
            case VINO_DATA_FMT_RGB332:
                  ctrl |= (vcs->channel == VINO_CHANNEL_A) ?
                        VINO_CTRL_A_RGB | VINO_CTRL_A_DITHER :
                        VINO_CTRL_B_RGB | VINO_CTRL_B_DITHER;
                  break;
      }

      vino->intr_status = intr;
      vino->control = ctrl;

      return 0;
}

/* (execute only with vino_lock locked) */
static inline void vino_dma_start(struct vino_channel_settings *vcs)
{
      u32 ctrl = vino->control;

      dprintk("vino_dma_start():\n");
      ctrl |= (vcs->channel == VINO_CHANNEL_A) ?
            VINO_CTRL_A_DMA_ENBL : VINO_CTRL_B_DMA_ENBL;
      vino->control = ctrl;
}

/* (execute only with vino_lock locked) */
static inline void vino_dma_stop(struct vino_channel_settings *vcs)
{
      u32 ctrl = vino->control;

      ctrl &= (vcs->channel == VINO_CHANNEL_A) ?
            ~VINO_CTRL_A_DMA_ENBL : ~VINO_CTRL_B_DMA_ENBL;
      ctrl &= (vcs->channel == VINO_CHANNEL_A) ?
            ~VINO_CTRL_A_INT : ~VINO_CTRL_B_INT;
      vino->control = ctrl;
      dprintk("vino_dma_stop():\n");
}

/*
 * Load dummy page to descriptor registers. This prevents generating of
 * spurious interrupts. (execute only with vino_lock locked)
 */
static void vino_clear_interrupt(struct vino_channel_settings *vcs)
{
      struct sgi_vino_channel *ch;

      ch = (vcs->channel == VINO_CHANNEL_A) ? &vino->a : &vino->b;

      ch->page_index = 0;
      ch->line_count = 0;

      ch->start_desc_tbl = vino_drvdata->dummy_desc_table.dma;
      ch->next_4_desc = vino_drvdata->dummy_desc_table.dma;

      udelay(VINO_DESC_FETCH_DELAY);
      dprintk("channel %c clear interrupt condition\n",
             (vcs->channel == VINO_CHANNEL_A) ? 'A':'B');
}

static int vino_capture(struct vino_channel_settings *vcs,
                  struct vino_framebuffer *fb)
{
      int err = 0;
      unsigned long flags, flags2;

      spin_lock_irqsave(&fb->state_lock, flags);

      if (fb->state == VINO_FRAMEBUFFER_IN_USE)
            err = -EBUSY;
      fb->state = VINO_FRAMEBUFFER_IN_USE;

      spin_unlock_irqrestore(&fb->state_lock, flags);

      if (err)
            return err;

      spin_lock_irqsave(&vino_drvdata->vino_lock, flags);
      spin_lock_irqsave(&vino_drvdata->input_lock, flags2);

      vino_dma_setup(vcs, fb);
      vino_dma_start(vcs);

      spin_unlock_irqrestore(&vino_drvdata->input_lock, flags2);
      spin_unlock_irqrestore(&vino_drvdata->vino_lock, flags);

      return err;
}

static
struct vino_framebuffer *vino_capture_enqueue(struct
                                    vino_channel_settings *vcs,
                                    unsigned int index)
{
      struct vino_framebuffer *fb;
      unsigned long flags;

      dprintk("vino_capture_enqueue():\n");

      spin_lock_irqsave(&vcs->capture_lock, flags);

      fb = vino_queue_add(&vcs->fb_queue, index);
      if (fb == NULL) {
            dprintk("vino_capture_enqueue(): vino_queue_add() failed, "
                  "queue full?\n");
            goto out;
      }
out:
      spin_unlock_irqrestore(&vcs->capture_lock, flags);

      return fb;
}

static int vino_capture_next(struct vino_channel_settings *vcs, int start)
{
      struct vino_framebuffer *fb;
      unsigned int incoming, id;
      int err = 0;
      unsigned long flags;

      dprintk("vino_capture_next():\n");

      spin_lock_irqsave(&vcs->capture_lock, flags);

      if (start) {
            /* start capture only if capture isn't in progress already */
            if (vcs->capturing) {
                  spin_unlock_irqrestore(&vcs->capture_lock, flags);
                  return 0;
            }

      } else {
            /* capture next frame:
             * stop capture if capturing is not set */
            if (!vcs->capturing) {
                  spin_unlock_irqrestore(&vcs->capture_lock, flags);
                  return 0;
            }
      }

      err = vino_queue_get_incoming(&vcs->fb_queue, &incoming);
      if (err) {
            dprintk("vino_capture_next(): vino_queue_get_incoming() "
                  "failed\n");
            err = -EINVAL;
            goto out;
      }
      if (incoming == 0) {
            dprintk("vino_capture_next(): no buffers available\n");
            goto out;
      }

      fb = vino_queue_peek(&vcs->fb_queue, &id);
      if (fb == NULL) {
            dprintk("vino_capture_next(): vino_queue_peek() failed\n");
            err = -EINVAL;
            goto out;
      }

      if (start) {
            vcs->capturing = 1;
      }

      spin_unlock_irqrestore(&vcs->capture_lock, flags);

      err = vino_capture(vcs, fb);

      return err;

out:
      vcs->capturing = 0;
      spin_unlock_irqrestore(&vcs->capture_lock, flags);

      return err;
}

static inline int vino_is_capturing(struct vino_channel_settings *vcs)
{
      int ret;
      unsigned long flags;

      spin_lock_irqsave(&vcs->capture_lock, flags);

      ret = vcs->capturing;

      spin_unlock_irqrestore(&vcs->capture_lock, flags);

      return ret;
}

/* waits until a frame is captured */
static int vino_wait_for_frame(struct vino_channel_settings *vcs)
{
      wait_queue_t wait;
      int err = 0;

      dprintk("vino_wait_for_frame():\n");

      init_waitqueue_entry(&wait, current);
      /* add ourselves into wait queue */
      add_wait_queue(&vcs->fb_queue.frame_wait_queue, &wait);

      /* to ensure that schedule_timeout will return immediately
       * if VINO interrupt was triggered meanwhile */
      schedule_timeout_interruptible(msecs_to_jiffies(100));

      if (signal_pending(current))
            err = -EINTR;

      remove_wait_queue(&vcs->fb_queue.frame_wait_queue, &wait);

      dprintk("vino_wait_for_frame(): waiting for frame %s\n",
            err ? "failed" : "ok");

      return err;
}

/* the function assumes that PAGE_SIZE % 4 == 0 */
static void vino_convert_to_rgba(struct vino_framebuffer *fb) {
      unsigned char *pageptr;
      unsigned int page, i;
      unsigned char a;

      for (page = 0; page < fb->desc_table.page_count; page++) {
            pageptr = (unsigned char *)fb->desc_table.virtual[page];

            for (i = 0; i < PAGE_SIZE; i += 4) {
                  a = pageptr[0];
                  pageptr[0] = pageptr[3];
                  pageptr[1] = pageptr[2];
                  pageptr[2] = pageptr[1];
                  pageptr[3] = a;
                  pageptr += 4;
            }
      }
}

/* checks if the buffer is in correct state and syncs data */
static int vino_check_buffer(struct vino_channel_settings *vcs,
                       struct vino_framebuffer *fb)
{
      int err = 0;
      unsigned long flags;

      dprintk("vino_check_buffer():\n");

      spin_lock_irqsave(&fb->state_lock, flags);
      switch (fb->state) {
      case VINO_FRAMEBUFFER_IN_USE:
            err = -EIO;
            break;
      case VINO_FRAMEBUFFER_READY:
            vino_sync_buffer(fb);
            fb->state = VINO_FRAMEBUFFER_UNUSED;
            break;
      default:
            err = -EINVAL;
      }
      spin_unlock_irqrestore(&fb->state_lock, flags);

      if (!err) {
            if (vino_pixel_conversion
                && (fb->data_format == VINO_DATA_FMT_RGB32)) {
                  vino_convert_to_rgba(fb);
            }
      } else if (err && (err != -EINVAL)) {
            dprintk("vino_check_buffer(): buffer not ready\n");

            spin_lock_irqsave(&vino_drvdata->vino_lock, flags);
            vino_dma_stop(vcs);
            vino_clear_interrupt(vcs);
            spin_unlock_irqrestore(&vino_drvdata->vino_lock, flags);
      }

      return err;
}

/* forcefully terminates capture */
static void vino_capture_stop(struct vino_channel_settings *vcs)
{
      unsigned int incoming = 0, outgoing = 0, id;
      unsigned long flags, flags2;

      dprintk("vino_capture_stop():\n");

      spin_lock_irqsave(&vcs->capture_lock, flags);

      /* unset capturing to stop queue processing */
      vcs->capturing = 0;

      spin_lock_irqsave(&vino_drvdata->vino_lock, flags2);

      vino_dma_stop(vcs);
      vino_clear_interrupt(vcs);

      spin_unlock_irqrestore(&vino_drvdata->vino_lock, flags2);

      /* remove all items from the queue */
      if (vino_queue_get_incoming(&vcs->fb_queue, &incoming)) {
            dprintk("vino_capture_stop(): "
                  "vino_queue_get_incoming() failed\n");
            goto out;
      }
      while (incoming > 0) {
            vino_queue_transfer(&vcs->fb_queue);

            if (vino_queue_get_incoming(&vcs->fb_queue, &incoming)) {
                  dprintk("vino_capture_stop(): "
                        "vino_queue_get_incoming() failed\n");
                  goto out;
            }
      }

      if (vino_queue_get_outgoing(&vcs->fb_queue, &outgoing)) {
            dprintk("vino_capture_stop(): "
                  "vino_queue_get_outgoing() failed\n");
            goto out;
      }
      while (outgoing > 0) {
            vino_queue_remove(&vcs->fb_queue, &id);

            if (vino_queue_get_outgoing(&vcs->fb_queue, &outgoing)) {
                  dprintk("vino_capture_stop(): "
                        "vino_queue_get_outgoing() failed\n");
                  goto out;
            }
      }

out:
      spin_unlock_irqrestore(&vcs->capture_lock, flags);
}

#if 0
static int vino_capture_failed(struct vino_channel_settings *vcs)
{
      struct vino_framebuffer *fb;
      unsigned long flags;
      unsigned int i;
      int ret;

      dprintk("vino_capture_failed():\n");

      spin_lock_irqsave(&vino_drvdata->vino_lock, flags);

      vino_dma_stop(vcs);
      vino_clear_interrupt(vcs);

      spin_unlock_irqrestore(&vino_drvdata->vino_lock, flags);

      ret = vino_queue_get_incoming(&vcs->fb_queue, &i);
      if (ret == VINO_QUEUE_ERROR) {
            dprintk("vino_queue_get_incoming() failed\n");
            return -EINVAL;
      }
      if (i == 0) {
            /* no buffers to process */
            return 0;
      }

      fb = vino_queue_peek(&vcs->fb_queue, &i);
      if (fb == NULL) {
            dprintk("vino_queue_peek() failed\n");
            return -EINVAL;
      }

      spin_lock_irqsave(&fb->state_lock, flags);
      if (fb->state == VINO_FRAMEBUFFER_IN_USE) {
            fb->state = VINO_FRAMEBUFFER_UNUSED;
            vino_queue_transfer(&vcs->fb_queue);
            vino_queue_remove(&vcs->fb_queue, &i);
            /* we should actually discard the newest frame,
             * but who cares ... */
      }
      spin_unlock_irqrestore(&fb->state_lock, flags);

      return 0;
}
#endif

static void vino_skip_frame(struct vino_channel_settings *vcs)
{
      struct vino_framebuffer *fb;
      unsigned long flags;
      unsigned int id;

      spin_lock_irqsave(&vcs->capture_lock, flags);
      fb = vino_queue_peek(&vcs->fb_queue, &id);
      if (!fb) {
            spin_unlock_irqrestore(&vcs->capture_lock, flags);
            dprintk("vino_skip_frame(): vino_queue_peek() failed!\n");
            return;
      }
      spin_unlock_irqrestore(&vcs->capture_lock, flags);

      spin_lock_irqsave(&fb->state_lock, flags);
      fb->state = VINO_FRAMEBUFFER_UNUSED;
      spin_unlock_irqrestore(&fb->state_lock, flags);

      vino_capture_next(vcs, 0);
}

static void vino_frame_done(struct vino_channel_settings *vcs)
{
      struct vino_framebuffer *fb;
      unsigned long flags;

      spin_lock_irqsave(&vcs->capture_lock, flags);
      fb = vino_queue_transfer(&vcs->fb_queue);
      if (!fb) {
            spin_unlock_irqrestore(&vcs->capture_lock, flags);
            dprintk("vino_frame_done(): vino_queue_transfer() failed!\n");
            return;
      }
      spin_unlock_irqrestore(&vcs->capture_lock, flags);

      fb->frame_counter = vcs->int_data.frame_counter;
      memcpy(&fb->timestamp, &vcs->int_data.timestamp,
             sizeof(struct timeval));

      spin_lock_irqsave(&fb->state_lock, flags);
      if (fb->state == VINO_FRAMEBUFFER_IN_USE)
            fb->state = VINO_FRAMEBUFFER_READY;
      spin_unlock_irqrestore(&fb->state_lock, flags);

      wake_up(&vcs->fb_queue.frame_wait_queue);

      vino_capture_next(vcs, 0);
}

static void vino_capture_tasklet(unsigned long channel) {
      struct vino_channel_settings *vcs;

      vcs = (channel == VINO_CHANNEL_A)
            ? &vino_drvdata->a : &vino_drvdata->b;

      if (vcs->int_data.skip)
            vcs->int_data.skip_count++;

      if (vcs->int_data.skip && (vcs->int_data.skip_count
                           <= VINO_MAX_FRAME_SKIP_COUNT)) {
            vino_skip_frame(vcs);
      } else {
            vcs->int_data.skip_count = 0;
            vino_frame_done(vcs);
      }
}

static irqreturn_t vino_interrupt(int irq, void *dev_id)
{
      u32 ctrl, intr;
      unsigned int fc_a, fc_b;
      int handled_a = 0, skip_a = 0, done_a = 0;
      int handled_b = 0, skip_b = 0, done_b = 0;

#ifdef VINO_DEBUG_INT
      int loop = 0;
      unsigned int line_count = vino->a.line_count,
            page_index = vino->a.page_index,
            field_counter = vino->a.field_counter,
            start_desc_tbl = vino->a.start_desc_tbl,
            next_4_desc = vino->a.next_4_desc;
      unsigned int line_count_2,
            page_index_2,
            field_counter_2,
            start_desc_tbl_2,
            next_4_desc_2;
#endif

      spin_lock(&vino_drvdata->vino_lock);

      while ((intr = vino->intr_status)) {
            fc_a = vino->a.field_counter >> 1;
            fc_b = vino->b.field_counter >> 1;

            /* handle error-interrupts in some special way ?
             * --> skips frames */
            if (intr & VINO_INTSTAT_A) {
                  if (intr & VINO_INTSTAT_A_EOF) {
                        vino_drvdata->a.field++;
                        if (vino_drvdata->a.field > 1) {
                              vino_dma_stop(&vino_drvdata->a);
                              vino_clear_interrupt(&vino_drvdata->a);
                              vino_drvdata->a.field = 0;
                              done_a = 1;
                        } else {
                              if (vino->a.page_index
                                  != vino_drvdata->a.line_size) {
                                    vino->a.line_count = 0;
                                    vino->a.page_index =
                                          vino_drvdata->
                                          a.line_size;
                                    vino->a.next_4_desc =
                                          vino->a.start_desc_tbl;
                              }
                        }
                        dprintk("channel A end-of-field "
                              "interrupt: %04x\n", intr);
                  } else {
                        vino_dma_stop(&vino_drvdata->a);
                        vino_clear_interrupt(&vino_drvdata->a);
                        vino_drvdata->a.field = 0;
                        skip_a = 1;
                        dprintk("channel A error interrupt: %04x\n",
                              intr);
                  }

#ifdef VINO_DEBUG_INT
                  line_count_2 = vino->a.line_count;
                  page_index_2 = vino->a.page_index;
                  field_counter_2 = vino->a.field_counter;
                  start_desc_tbl_2 = vino->a.start_desc_tbl;
                  next_4_desc_2 = vino->a.next_4_desc;

                  printk("intr = %04x, loop = %d, field = %d\n",
                         intr, loop, vino_drvdata->a.field);
                  printk("1- line count = %04d, page index = %04d, "
                         "start = %08x, next = %08x\n"
                         "   fieldc = %d, framec = %d\n",
                         line_count, page_index, start_desc_tbl,
                         next_4_desc, field_counter, fc_a);
                  printk("12-line count = %04d, page index = %04d, "
                         "   start = %08x, next = %08x\n",
                         line_count_2, page_index_2, start_desc_tbl_2,
                         next_4_desc_2);

                  if (done_a)
                        printk("\n");
#endif
            }

            if (intr & VINO_INTSTAT_B) {
                  if (intr & VINO_INTSTAT_B_EOF) {
                        vino_drvdata->b.field++;
                        if (vino_drvdata->b.field > 1) {
                              vino_dma_stop(&vino_drvdata->b);
                              vino_clear_interrupt(&vino_drvdata->b);
                              vino_drvdata->b.field = 0;
                              done_b = 1;
                        }
                        dprintk("channel B end-of-field "
                              "interrupt: %04x\n", intr);
                  } else {
                        vino_dma_stop(&vino_drvdata->b);
                        vino_clear_interrupt(&vino_drvdata->b);
                        vino_drvdata->b.field = 0;
                        skip_b = 1;
                        dprintk("channel B error interrupt: %04x\n",
                              intr);
                  }
            }

            /* Always remember to clear interrupt status.
             * Disable VINO interrupts while we do this. */
            ctrl = vino->control;
            vino->control = ctrl & ~(VINO_CTRL_A_INT | VINO_CTRL_B_INT);
            vino->intr_status = ~intr;
            vino->control = ctrl;

            spin_unlock(&vino_drvdata->vino_lock);

            if ((!handled_a) && (done_a || skip_a)) {
                  if (!skip_a) {
                        do_gettimeofday(&vino_drvdata->
                                    a.int_data.timestamp);
                        vino_drvdata->a.int_data.frame_counter = fc_a;
                  }
                  vino_drvdata->a.int_data.skip = skip_a;

                  dprintk("channel A %s, interrupt: %d\n",
                        skip_a ? "skipping frame" : "frame done",
                        intr);
                  tasklet_hi_schedule(&vino_tasklet_a);
                  handled_a = 1;
            }

            if ((!handled_b) && (done_b || skip_b)) {
                  if (!skip_b) {
                        do_gettimeofday(&vino_drvdata->
                                    b.int_data.timestamp);
                        vino_drvdata->b.int_data.frame_counter = fc_b;
                  }
                  vino_drvdata->b.int_data.skip = skip_b;

                  dprintk("channel B %s, interrupt: %d\n",
                        skip_b ? "skipping frame" : "frame done",
                        intr);
                  tasklet_hi_schedule(&vino_tasklet_b);
                  handled_b = 1;
            }

#ifdef VINO_DEBUG_INT
            loop++;
#endif
            spin_lock(&vino_drvdata->vino_lock);
      }

      spin_unlock(&vino_drvdata->vino_lock);

      return IRQ_HANDLED;
}

/* VINO video input management */

static int vino_get_saa7191_input(int input)
{
      switch (input) {
      case VINO_INPUT_COMPOSITE:
            return SAA7191_INPUT_COMPOSITE;
      case VINO_INPUT_SVIDEO:
            return SAA7191_INPUT_SVIDEO;
      default:
            printk(KERN_ERR "VINO: vino_get_saa7191_input(): "
                   "invalid input!\n");
            return -1;
      }
}

static int vino_get_saa7191_norm(unsigned int data_norm)
{
      switch (data_norm) {
      case VINO_DATA_NORM_AUTO:
            return SAA7191_NORM_AUTO;
      case VINO_DATA_NORM_AUTO_EXT:
            return SAA7191_NORM_AUTO_EXT;
      case VINO_DATA_NORM_PAL:
            return SAA7191_NORM_PAL;
      case VINO_DATA_NORM_NTSC:
            return SAA7191_NORM_NTSC;
      case VINO_DATA_NORM_SECAM:
            return SAA7191_NORM_SECAM;
      default:
            printk(KERN_ERR "VINO: vino_get_saa7191_norm(): "
                   "invalid norm!\n");
            return -1;
      }
}

static int vino_get_from_saa7191_norm(int saa7191_norm)
{
      switch (saa7191_norm) {
      case SAA7191_NORM_PAL:
            return VINO_DATA_NORM_PAL;
      case SAA7191_NORM_NTSC:
            return VINO_DATA_NORM_NTSC;
      case SAA7191_NORM_SECAM:
            return VINO_DATA_NORM_SECAM;
      default:
            printk(KERN_ERR "VINO: vino_get_from_saa7191_norm(): "
                   "invalid norm!\n");
            return VINO_DATA_NORM_NONE;
      }
}

static int vino_saa7191_set_norm(unsigned int *data_norm)
{
      int saa7191_norm, new_data_norm;
      int err = 0;

      saa7191_norm = vino_get_saa7191_norm(*data_norm);

      err = i2c_decoder_command(DECODER_SAA7191_SET_NORM,
                          &saa7191_norm);
      if (err)
            goto out;

      if ((*data_norm == VINO_DATA_NORM_AUTO)
          || (*data_norm == VINO_DATA_NORM_AUTO_EXT)) {
            struct saa7191_status status;

            err = i2c_decoder_command(DECODER_SAA7191_GET_STATUS,
                                &status);
            if (err)
                  goto out;

            new_data_norm =
                  vino_get_from_saa7191_norm(status.norm);
            if (new_data_norm == VINO_DATA_NORM_NONE) {
                  err = -EINVAL;
                  goto out;
            }

            *data_norm = (unsigned int)new_data_norm;
      }

out:
      return err;
}

/* execute with input_lock locked */
static int vino_is_input_owner(struct vino_channel_settings *vcs)
{
      switch(vcs->input) {
      case VINO_INPUT_COMPOSITE:
      case VINO_INPUT_SVIDEO:
            return (vino_drvdata->decoder.owner == vcs->channel);
      case VINO_INPUT_D1:
            return (vino_drvdata->camera.owner == vcs->channel);
      default:
            return 0;
      }
}

static int vino_acquire_input(struct vino_channel_settings *vcs)
{
      unsigned long flags;
      int ret = 0;

      dprintk("vino_acquire_input():\n");

      spin_lock_irqsave(&vino_drvdata->input_lock, flags);

      /* First try D1 and then SAA7191 */
      if (vino_drvdata->camera.driver
          && (vino_drvdata->camera.owner == VINO_NO_CHANNEL)) {
            if (i2c_use_client(vino_drvdata->camera.driver)) {
                  ret = -ENODEV;
                  goto out;
            }

            vino_drvdata->camera.owner = vcs->channel;
            vcs->input = VINO_INPUT_D1;
            vcs->data_norm = VINO_DATA_NORM_D1;
      } else if (vino_drvdata->decoder.driver
               && (vino_drvdata->decoder.owner == VINO_NO_CHANNEL)) {
            int input, data_norm;
            int saa7191_input;

            if (i2c_use_client(vino_drvdata->decoder.driver)) {
                  ret = -ENODEV;
                  goto out;
            }

            input = VINO_INPUT_COMPOSITE;

            saa7191_input = vino_get_saa7191_input(input);
            ret = i2c_decoder_command(DECODER_SET_INPUT,
                                &saa7191_input);
            if (ret) {
                  ret = -EINVAL;
                  goto out;
            }

            spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

            /* Don't hold spinlocks while auto-detecting norm
             * as it may take a while... */

            data_norm = VINO_DATA_NORM_AUTO_EXT;

            ret = vino_saa7191_set_norm(&data_norm);
            if ((ret == -EBUSY) || (ret == -EAGAIN)) {
                  data_norm = VINO_DATA_NORM_PAL;
                  ret = vino_saa7191_set_norm(&data_norm);
            }

            spin_lock_irqsave(&vino_drvdata->input_lock, flags);

            if (ret) {
                  ret = -EINVAL;
                  goto out;
            }

            vino_drvdata->decoder.owner = vcs->channel;

            vcs->input = input;
            vcs->data_norm = data_norm;
      } else {
            vcs->input = (vcs->channel == VINO_CHANNEL_A) ?
                  vino_drvdata->b.input : vino_drvdata->a.input;
            vcs->data_norm = (vcs->channel == VINO_CHANNEL_A) ?
                  vino_drvdata->b.data_norm : vino_drvdata->a.data_norm;
      }

      if (vcs->input == VINO_INPUT_NONE) {
            ret = -ENODEV;
            goto out;
      }

      vino_set_default_clipping(vcs);
      vino_set_default_scaling(vcs);
      vino_set_default_framerate(vcs);

      dprintk("vino_acquire_input(): %s\n", vino_inputs[vcs->input].name);

out:
      spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

      return ret;
}

static int vino_set_input(struct vino_channel_settings *vcs, int input)
{
      struct vino_channel_settings *vcs2 = (vcs->channel == VINO_CHANNEL_A) ?
            &vino_drvdata->b : &vino_drvdata->a;
      unsigned long flags;
      int ret = 0;

      dprintk("vino_set_input():\n");

      spin_lock_irqsave(&vino_drvdata->input_lock, flags);

      if (vcs->input == input)
            goto out;

      switch (input) {
      case VINO_INPUT_COMPOSITE:
      case VINO_INPUT_SVIDEO:
            if (!vino_drvdata->decoder.driver) {
                  ret = -EINVAL;
                  goto out;
            }

            if (vino_drvdata->decoder.owner == VINO_NO_CHANNEL) {
                  if (i2c_use_client(vino_drvdata->decoder.driver)) {
                        ret = -ENODEV;
                        goto out;
                  }
                  vino_drvdata->decoder.owner = vcs->channel;
            }

            if (vino_drvdata->decoder.owner == vcs->channel) {
                  int data_norm;
                  int saa7191_input;

                  saa7191_input = vino_get_saa7191_input(input);
                  ret = i2c_decoder_command(DECODER_SET_INPUT,
                                      &saa7191_input);
                  if (ret) {
                        vino_drvdata->decoder.owner = VINO_NO_CHANNEL;
                        ret = -EINVAL;
                        goto out;
                  }

                  spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

                  /* Don't hold spinlocks while auto-detecting norm
                   * as it may take a while... */

                  data_norm = VINO_DATA_NORM_AUTO_EXT;

                  ret = vino_saa7191_set_norm(&data_norm);
                  if ((ret  == -EBUSY) || (ret == -EAGAIN)) {
                        data_norm = VINO_DATA_NORM_PAL;
                        ret = vino_saa7191_set_norm(&data_norm);
                  }

                  spin_lock_irqsave(&vino_drvdata->input_lock, flags);

                  if (ret) {
                        vino_drvdata->decoder.owner = VINO_NO_CHANNEL;
                        ret = -EINVAL;
                        goto out;
                  }

                  vcs->input = input;
                  vcs->data_norm = data_norm;
            } else {
                  if (input != vcs2->input) {
                        ret = -EBUSY;
                        goto out;
                  }

                  vcs->input = input;
                  vcs->data_norm = vcs2->data_norm;
            }

            if (vino_drvdata->camera.owner == vcs->channel) {
                  /* Transfer the ownership or release the input */
                  if (vcs2->input == VINO_INPUT_D1) {
                        vino_drvdata->camera.owner = vcs2->channel;
                  } else {
                        i2c_release_client(vino_drvdata->
                                       camera.driver);
                        vino_drvdata->camera.owner = VINO_NO_CHANNEL;
                  }
            }
            break;
      case VINO_INPUT_D1:
            if (!vino_drvdata->camera.driver) {
                  ret = -EINVAL;
                  goto out;
            }

            if (vino_drvdata->camera.owner == VINO_NO_CHANNEL) {
                  if (i2c_use_client(vino_drvdata->camera.driver)) {
                        ret = -ENODEV;
                        goto out;
                  }
                  vino_drvdata->camera.owner = vcs->channel;
            }

            if (vino_drvdata->decoder.owner == vcs->channel) {
                  /* Transfer the ownership or release the input */
                  if ((vcs2->input == VINO_INPUT_COMPOSITE) ||
                         (vcs2->input == VINO_INPUT_SVIDEO)) {
                        vino_drvdata->decoder.owner = vcs2->channel;
                  } else {
                        i2c_release_client(vino_drvdata->
                                       decoder.driver);
                        vino_drvdata->decoder.owner = VINO_NO_CHANNEL;
                  }
            }

            vcs->input = input;
            vcs->data_norm = VINO_DATA_NORM_D1;
            break;
      default:
            ret = -EINVAL;
            goto out;
      }

      vino_set_default_clipping(vcs);
      vino_set_default_scaling(vcs);
      vino_set_default_framerate(vcs);

      dprintk("vino_set_input(): %s\n", vino_inputs[vcs->input].name);

out:
      spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

      return ret;
}

static void vino_release_input(struct vino_channel_settings *vcs)
{
      struct vino_channel_settings *vcs2 = (vcs->channel == VINO_CHANNEL_A) ?
            &vino_drvdata->b : &vino_drvdata->a;
      unsigned long flags;

      dprintk("vino_release_input():\n");

      spin_lock_irqsave(&vino_drvdata->input_lock, flags);

      /* Release ownership of the channel
       * and if the other channel takes input from
       * the same source, transfer the ownership */
      if (vino_drvdata->camera.owner == vcs->channel) {
            if (vcs2->input == VINO_INPUT_D1) {
                  vino_drvdata->camera.owner = vcs2->channel;
            } else {
                  i2c_release_client(vino_drvdata->camera.driver);
                  vino_drvdata->camera.owner = VINO_NO_CHANNEL;
            }
      } else if (vino_drvdata->decoder.owner == vcs->channel) {
            if ((vcs2->input == VINO_INPUT_COMPOSITE) ||
                   (vcs2->input == VINO_INPUT_SVIDEO)) {
                  vino_drvdata->decoder.owner = vcs2->channel;
            } else {
                  i2c_release_client(vino_drvdata->decoder.driver);
                  vino_drvdata->decoder.owner = VINO_NO_CHANNEL;
            }
      }
      vcs->input = VINO_INPUT_NONE;

      spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);
}

/* execute with input_lock locked */
static int vino_set_data_norm(struct vino_channel_settings *vcs,
                        unsigned int data_norm,
                        unsigned long *flags)
{
      int err = 0;

      if (data_norm == vcs->data_norm)
            return 0;

      switch (vcs->input) {
      case VINO_INPUT_D1:
            /* only one "norm" supported */
            if ((data_norm != VINO_DATA_NORM_D1)
                && (data_norm != VINO_DATA_NORM_AUTO)
                && (data_norm != VINO_DATA_NORM_AUTO_EXT))
                  return -EINVAL;
            break;
      case VINO_INPUT_COMPOSITE:
      case VINO_INPUT_SVIDEO: {
            if ((data_norm != VINO_DATA_NORM_PAL)
                && (data_norm != VINO_DATA_NORM_NTSC)
                && (data_norm != VINO_DATA_NORM_SECAM)
                && (data_norm != VINO_DATA_NORM_AUTO)
                && (data_norm != VINO_DATA_NORM_AUTO_EXT))
                  return -EINVAL;

            spin_unlock_irqrestore(&vino_drvdata->input_lock, *flags);

            /* Don't hold spinlocks while setting norm
             * as it may take a while... */

            err = vino_saa7191_set_norm(&data_norm);

            spin_lock_irqsave(&vino_drvdata->input_lock, *flags);

            if (err)
                  goto out;

            vcs->data_norm = data_norm;

            vino_set_default_clipping(vcs);
            vino_set_default_scaling(vcs);
            vino_set_default_framerate(vcs);
            break;
      }
      default:
            return -EINVAL;
      }

out:
      return err;
}

/* V4L2 helper functions */

static int vino_find_data_format(__u32 pixelformat)
{
      int i;

      for (i = 0; i < VINO_DATA_FMT_COUNT; i++) {
            if (vino_data_formats[i].pixelformat == pixelformat)
                  return i;
      }

      return VINO_DATA_FMT_NONE;
}

static int vino_enum_data_norm(struct vino_channel_settings *vcs, __u32 index)
{
      int data_norm = VINO_DATA_NORM_NONE;
      unsigned long flags;

      spin_lock_irqsave(&vino_drvdata->input_lock, flags);
      switch(vcs->input) {
      case VINO_INPUT_COMPOSITE:
      case VINO_INPUT_SVIDEO:
            if (index == 0) {
                  data_norm = VINO_DATA_NORM_PAL;
            } else if (index == 1) {
                  data_norm = VINO_DATA_NORM_NTSC;
            } else if (index == 2) {
                  data_norm = VINO_DATA_NORM_SECAM;
            }
            break;
      case VINO_INPUT_D1:
            if (index == 0) {
                  data_norm = VINO_DATA_NORM_D1;
            }
            break;
      }
      spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

      return data_norm;
}

static int vino_enum_input(struct vino_channel_settings *vcs, __u32 index)
{
      int input = VINO_INPUT_NONE;
      unsigned long flags;

      spin_lock_irqsave(&vino_drvdata->input_lock, flags);
      if (vino_drvdata->decoder.driver && vino_drvdata->camera.driver) {
            switch (index) {
            case 0:
                  input = VINO_INPUT_COMPOSITE;
                  break;
            case 1:
                  input = VINO_INPUT_SVIDEO;
                  break;
            case 2:
                  input = VINO_INPUT_D1;
                  break;
            }
      } else if (vino_drvdata->decoder.driver) {
            switch (index) {
            case 0:
                  input = VINO_INPUT_COMPOSITE;
                  break;
            case 1:
                  input = VINO_INPUT_SVIDEO;
                  break;
            }
      } else if (vino_drvdata->camera.driver) {
            switch (index) {
            case 0:
                  input = VINO_INPUT_D1;
                  break;
            }
      }
      spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

      return input;
}

/* execute with input_lock locked */
static __u32 vino_find_input_index(struct vino_channel_settings *vcs)
{
      __u32 index = 0;
      // FIXME: detect when no inputs available

      if (vino_drvdata->decoder.driver && vino_drvdata->camera.driver) {
            switch (vcs->input) {
            case VINO_INPUT_COMPOSITE:
                  index = 0;
                  break;
            case VINO_INPUT_SVIDEO:
                  index = 1;
                  break;
            case VINO_INPUT_D1:
                  index = 2;
                  break;
            }
      } else if (vino_drvdata->decoder.driver) {
            switch (vcs->input) {
            case VINO_INPUT_COMPOSITE:
                  index = 0;
                  break;
            case VINO_INPUT_SVIDEO:
                  index = 1;
                  break;
            }
      } else if (vino_drvdata->camera.driver) {
            switch (vcs->input) {
            case VINO_INPUT_D1:
                  index = 0;
                  break;
            }
      }

      return index;
}

/* V4L2 ioctls */

static void vino_v4l2_querycap(struct v4l2_capability *cap)
{
      memset(cap, 0, sizeof(struct v4l2_capability));

      strcpy(cap->driver, vino_driver_name);
      strcpy(cap->card, vino_driver_description);
      strcpy(cap->bus_info, vino_bus_name);
      cap->version = VINO_VERSION_CODE;
      cap->capabilities =
            V4L2_CAP_VIDEO_CAPTURE |
            V4L2_CAP_STREAMING;
      // V4L2_CAP_OVERLAY, V4L2_CAP_READWRITE
}

static int vino_v4l2_enuminput(struct vino_channel_settings *vcs,
                         struct v4l2_input *i)
{
      __u32 index = i->index;
      int input;
      dprintk("requested index = %d\n", index);

      input = vino_enum_input(vcs, index);
      if (input == VINO_INPUT_NONE)
            return -EINVAL;

      memset(i, 0, sizeof(struct v4l2_input));

      i->index = index;
      i->type = V4L2_INPUT_TYPE_CAMERA;
      i->std = vino_inputs[input].std;
      strcpy(i->name, vino_inputs[input].name);

      if ((input == VINO_INPUT_COMPOSITE)
          || (input == VINO_INPUT_SVIDEO)) {
            struct saa7191_status status;
            i2c_decoder_command(DECODER_SAA7191_GET_STATUS, &status);
            i->status |= status.signal ? 0 : V4L2_IN_ST_NO_SIGNAL;
            i->status |= status.color ? 0 : V4L2_IN_ST_NO_COLOR;
      }

      return 0;
}

static int vino_v4l2_g_input(struct vino_channel_settings *vcs,
                       unsigned int *i)
{
      __u32 index;
      int input;
      unsigned long flags;

      spin_lock_irqsave(&vino_drvdata->input_lock, flags);
      input = vcs->input;
      index = vino_find_input_index(vcs);
      spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

      dprintk("input = %d\n", input);

      if (input == VINO_INPUT_NONE) {
            return -EINVAL;
      }

      *i = index;

      return 0;
}

static int vino_v4l2_s_input(struct vino_channel_settings *vcs,
                       unsigned int *i)
{
      int input;
      dprintk("requested input = %d\n", *i);

      input = vino_enum_input(vcs, *i);
      if (input == VINO_INPUT_NONE)
            return -EINVAL;

      return vino_set_input(vcs, input);
}

static int vino_v4l2_enumstd(struct vino_channel_settings *vcs,
                       struct v4l2_standard *s)
{
      int index = s->index;
      int data_norm;

      data_norm = vino_enum_data_norm(vcs, index);
      dprintk("standard index = %d\n", index);

      if (data_norm == VINO_DATA_NORM_NONE)
            return -EINVAL;

      dprintk("standard name = %s\n",
             vino_data_norms[data_norm].description);

      memset(s, 0, sizeof(struct v4l2_standard));
      s->index = index;

      s->id = vino_data_norms[data_norm].std;
      s->frameperiod.numerator = 1;
      s->frameperiod.denominator =
            vino_data_norms[data_norm].fps_max;
      s->framelines =
            vino_data_norms[data_norm].framelines;
      strcpy(s->name,
             vino_data_norms[data_norm].description);

      return 0;
}

static int vino_v4l2_querystd(struct vino_channel_settings *vcs,
                        v4l2_std_id *std)
{
      unsigned long flags;
      int err = 0;

      spin_lock_irqsave(&vino_drvdata->input_lock, flags);

      switch (vcs->input) {
      case VINO_INPUT_D1:
            *std = vino_inputs[vcs->input].std;
            break;
      case VINO_INPUT_COMPOSITE:
      case VINO_INPUT_SVIDEO: {
            struct saa7191_status status;

            i2c_decoder_command(DECODER_SAA7191_GET_STATUS, &status);

            if (status.signal) {
                  if (status.signal_60hz) {
                        *std = V4L2_STD_NTSC;
                  } else {
                        *std = V4L2_STD_PAL | V4L2_STD_SECAM;
                  }
            } else {
                  *std = vino_inputs[vcs->input].std;
            }
            break;
      }
      default:
            err = -EINVAL;
      }

      spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

      return err;
}

static int vino_v4l2_g_std(struct vino_channel_settings *vcs,
                     v4l2_std_id *std)
{
      unsigned long flags;

      spin_lock_irqsave(&vino_drvdata->input_lock, flags);

      *std = vino_data_norms[vcs->data_norm].std;
      dprintk("current standard = %d\n", vcs->data_norm);

      spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

      return 0;
}

static int vino_v4l2_s_std(struct vino_channel_settings *vcs,
                     v4l2_std_id *std)
{
      unsigned long flags;
      int ret = 0;

      spin_lock_irqsave(&vino_drvdata->input_lock, flags);

      if (!vino_is_input_owner(vcs)) {
            ret = -EBUSY;
            goto out;
      }

      /* check if the standard is valid for the current input */
      if ((*std) & vino_inputs[vcs->input].std) {
            dprintk("standard accepted\n");

            /* change the video norm for SAA7191
             * and accept NTSC for D1 (do nothing) */

            if (vcs->input == VINO_INPUT_D1)
                  goto out;

            if (((*std) & V4L2_STD_PAL)
                && ((*std) & V4L2_STD_NTSC)
                && ((*std) & V4L2_STD_SECAM)) {
                  ret = vino_set_data_norm(vcs, VINO_DATA_NORM_AUTO_EXT,
                                     &flags);
            } else if ((*std) & V4L2_STD_PAL) {
                  ret = vino_set_data_norm(vcs, VINO_DATA_NORM_PAL,
                                     &flags);
            } else if ((*std) & V4L2_STD_NTSC) {
                  ret = vino_set_data_norm(vcs, VINO_DATA_NORM_NTSC,
                                     &flags);
            } else if ((*std) & V4L2_STD_SECAM) {
                  ret = vino_set_data_norm(vcs, VINO_DATA_NORM_SECAM,
                                     &flags);
            } else {
                  ret = -EINVAL;
            }

            if (ret) {
                  ret = -EINVAL;
            }
      } else {
            ret = -EINVAL;
      }

out:
      spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

      return ret;
}

static int vino_v4l2_enum_fmt(struct vino_channel_settings *vcs,
                        struct v4l2_fmtdesc *fd)
{
      enum v4l2_buf_type type = fd->type;
      int index = fd->index;
      dprintk("format index = %d\n", index);

      switch (fd->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE:
            if ((fd->index < 0) ||
                (fd->index >= VINO_DATA_FMT_COUNT))
                  return -EINVAL;
            dprintk("format name = %s\n",
                   vino_data_formats[index].description);

            memset(fd, 0, sizeof(struct v4l2_fmtdesc));
            fd->index = index;
            fd->type = type;
            fd->pixelformat = vino_data_formats[index].pixelformat;
            strcpy(fd->description, vino_data_formats[index].description);
            break;
      case V4L2_BUF_TYPE_VIDEO_OVERLAY:
      default:
            return -EINVAL;
      }

      return 0;
}

static int vino_v4l2_try_fmt(struct vino_channel_settings *vcs,
                       struct v4l2_format *f)
{
      struct vino_channel_settings tempvcs;
      unsigned long flags;

      switch (f->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
            struct v4l2_pix_format *pf = &f->fmt.pix;

            dprintk("requested: w = %d, h = %d\n",
                   pf->width, pf->height);

            spin_lock_irqsave(&vino_drvdata->input_lock, flags);
            memcpy(&tempvcs, vcs, sizeof(struct vino_channel_settings));
            spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

            tempvcs.data_format = vino_find_data_format(pf->pixelformat);
            if (tempvcs.data_format == VINO_DATA_FMT_NONE) {
                  tempvcs.data_format = VINO_DATA_FMT_GREY;
                  pf->pixelformat =
                        vino_data_formats[tempvcs.data_format].
                        pixelformat;
            }

            /* data format must be set before clipping/scaling */
            vino_set_scaling(&tempvcs, pf->width, pf->height);

            dprintk("data format = %s\n",
                   vino_data_formats[tempvcs.data_format].description);

            pf->width = (tempvcs.clipping.right - tempvcs.clipping.left) /
                  tempvcs.decimation;
            pf->height = (tempvcs.clipping.bottom - tempvcs.clipping.top) /
                  tempvcs.decimation;

            pf->field = V4L2_FIELD_INTERLACED;
            pf->bytesperline = tempvcs.line_size;
            pf->sizeimage = tempvcs.line_size *
                  (tempvcs.clipping.bottom - tempvcs.clipping.top) /
                  tempvcs.decimation;
            pf->colorspace =
                  vino_data_formats[tempvcs.data_format].colorspace;

            pf->priv = 0;
            break;
      }
      case V4L2_BUF_TYPE_VIDEO_OVERLAY:
      default:
            return -EINVAL;
      }

      return 0;
}

static int vino_v4l2_g_fmt(struct vino_channel_settings *vcs,
                     struct v4l2_format *f)
{
      unsigned long flags;

      switch (f->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
            struct v4l2_pix_format *pf = &f->fmt.pix;

            spin_lock_irqsave(&vino_drvdata->input_lock, flags);

            pf->width = (vcs->clipping.right - vcs->clipping.left) /
                  vcs->decimation;
            pf->height = (vcs->clipping.bottom - vcs->clipping.top) /
                  vcs->decimation;
            pf->pixelformat =
                  vino_data_formats[vcs->data_format].pixelformat;

            pf->field = V4L2_FIELD_INTERLACED;
            pf->bytesperline = vcs->line_size;
            pf->sizeimage = vcs->line_size *
                  (vcs->clipping.bottom - vcs->clipping.top) /
                  vcs->decimation;
            pf->colorspace =
                  vino_data_formats[vcs->data_format].colorspace;

            pf->priv = 0;

            spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);
            break;
      }
      case V4L2_BUF_TYPE_VIDEO_OVERLAY:
      default:
            return -EINVAL;
      }

      return 0;
}

static int vino_v4l2_s_fmt(struct vino_channel_settings *vcs,
                     struct v4l2_format *f)
{
      int data_format;
      unsigned long flags;

      switch (f->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
            struct v4l2_pix_format *pf = &f->fmt.pix;

            spin_lock_irqsave(&vino_drvdata->input_lock, flags);

            data_format = vino_find_data_format(pf->pixelformat);

            if (data_format == VINO_DATA_FMT_NONE) {
                  vcs->data_format = VINO_DATA_FMT_GREY;
                  pf->pixelformat =
                        vino_data_formats[vcs->data_format].
                        pixelformat;
            } else {
                  vcs->data_format = data_format;
            }

            /* data format must be set before clipping/scaling */
            vino_set_scaling(vcs, pf->width, pf->height);

            dprintk("data format = %s\n",
                   vino_data_formats[vcs->data_format].description);

            pf->width = vcs->clipping.right - vcs->clipping.left;
            pf->height = vcs->clipping.bottom - vcs->clipping.top;

            pf->field = V4L2_FIELD_INTERLACED;
            pf->bytesperline = vcs->line_size;
            pf->sizeimage = vcs->line_size *
                  (vcs->clipping.bottom - vcs->clipping.top) /
                  vcs->decimation;
            pf->colorspace =
                  vino_data_formats[vcs->data_format].colorspace;

            pf->priv = 0;

            spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);
            break;
      }
      case V4L2_BUF_TYPE_VIDEO_OVERLAY:
      default:
            return -EINVAL;
      }

      return 0;
}

static int vino_v4l2_cropcap(struct vino_channel_settings *vcs,
                       struct v4l2_cropcap *ccap)
{
      const struct vino_data_norm *norm;
      unsigned long flags;

      switch (ccap->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE:
            spin_lock_irqsave(&vino_drvdata->input_lock, flags);

            norm = &vino_data_norms[vcs->data_norm];

            spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

            ccap->bounds.left = 0;
            ccap->bounds.top = 0;
            ccap->bounds.width = norm->width;
            ccap->bounds.height = norm->height;
            memcpy(&ccap->defrect, &ccap->bounds,
                   sizeof(struct v4l2_rect));

            ccap->pixelaspect.numerator = 1;
            ccap->pixelaspect.denominator = 1;
            break;
      case V4L2_BUF_TYPE_VIDEO_OVERLAY:
      default:
            return -EINVAL;
      }

      return 0;
}

static int vino_v4l2_g_crop(struct vino_channel_settings *vcs,
                      struct v4l2_crop *c)
{
      unsigned long flags;

      switch (c->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE:
            spin_lock_irqsave(&vino_drvdata->input_lock, flags);

            c->c.left = vcs->clipping.left;
            c->c.top = vcs->clipping.top;
            c->c.width = vcs->clipping.right - vcs->clipping.left;
            c->c.height = vcs->clipping.bottom - vcs->clipping.top;

            spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);
            break;
      case V4L2_BUF_TYPE_VIDEO_OVERLAY:
      default:
            return -EINVAL;
      }

      return 0;
}

static int vino_v4l2_s_crop(struct vino_channel_settings *vcs,
                      struct v4l2_crop *c)
{
      unsigned long flags;

      switch (c->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE:
            spin_lock_irqsave(&vino_drvdata->input_lock, flags);

            vino_set_clipping(vcs, c->c.left, c->c.top,
                          c->c.width, c->c.height);

            spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);
            break;
      case V4L2_BUF_TYPE_VIDEO_OVERLAY:
      default:
            return -EINVAL;
      }

      return 0;
}

static int vino_v4l2_g_parm(struct vino_channel_settings *vcs,
                      struct v4l2_streamparm *sp)
{
      unsigned long flags;

      switch (sp->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
            struct v4l2_captureparm *cp = &sp->parm.capture;
            memset(cp, 0, sizeof(struct v4l2_captureparm));

            cp->capability = V4L2_CAP_TIMEPERFRAME;
            cp->timeperframe.numerator = 1;

            spin_lock_irqsave(&vino_drvdata->input_lock, flags);

            cp->timeperframe.denominator = vcs->fps;

            spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

            // TODO: cp->readbuffers = xxx;
            break;
      }
      case V4L2_BUF_TYPE_VIDEO_OVERLAY:
      default:
            return -EINVAL;
      }

      return 0;
}

static int vino_v4l2_s_parm(struct vino_channel_settings *vcs,
                      struct v4l2_streamparm *sp)
{
      unsigned long flags;

      switch (sp->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
            struct v4l2_captureparm *cp = &sp->parm.capture;

            spin_lock_irqsave(&vino_drvdata->input_lock, flags);

            if ((cp->timeperframe.numerator == 0) ||
                (cp->timeperframe.denominator == 0)) {
                  /* reset framerate */
                  vino_set_default_framerate(vcs);
            } else {
                  vino_set_framerate(vcs, cp->timeperframe.denominator /
                                 cp->timeperframe.numerator);
            }

            spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

            // TODO: set buffers according to cp->readbuffers
            break;
      }
      case V4L2_BUF_TYPE_VIDEO_OVERLAY:
      default:
            return -EINVAL;
      }

      return 0;
}

static int vino_v4l2_reqbufs(struct vino_channel_settings *vcs,
                       struct v4l2_requestbuffers *rb)
{
      if (vcs->reading)
            return -EBUSY;

      switch (rb->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
            // TODO: check queue type
            if (rb->memory != V4L2_MEMORY_MMAP) {
                  dprintk("type not mmap\n");
                  return -EINVAL;
            }

            dprintk("count = %d\n", rb->count);
            if (rb->count > 0) {
                  if (vino_is_capturing(vcs)) {
                        dprintk("busy, capturing\n");
                        return -EBUSY;
                  }

                  if (vino_queue_has_mapped_buffers(&vcs->fb_queue)) {
                        dprintk("busy, buffers still mapped\n");
                        return -EBUSY;
                  } else {
                        vcs->streaming = 0;
                        vino_queue_free(&vcs->fb_queue);
                        vino_queue_init(&vcs->fb_queue, &rb->count);
                  }
            } else {
                  vcs->streaming = 0;
                  vino_capture_stop(vcs);
                  vino_queue_free(&vcs->fb_queue);
            }
            break;
      }
      case V4L2_BUF_TYPE_VIDEO_OVERLAY:
      default:
            return -EINVAL;
      }

      return 0;
}

static void vino_v4l2_get_buffer_status(struct vino_channel_settings *vcs,
                              struct vino_framebuffer *fb,
                              struct v4l2_buffer *b)
{
      if (vino_queue_outgoing_contains(&vcs->fb_queue,
                               fb->id)) {
            b->flags &= ~V4L2_BUF_FLAG_QUEUED;
            b->flags |= V4L2_BUF_FLAG_DONE;
      } else if (vino_queue_incoming_contains(&vcs->fb_queue,
                               fb->id)) {
            b->flags &= ~V4L2_BUF_FLAG_DONE;
            b->flags |= V4L2_BUF_FLAG_QUEUED;
      } else {
            b->flags &= ~(V4L2_BUF_FLAG_DONE |
                        V4L2_BUF_FLAG_QUEUED);
      }

      b->flags &= ~(V4L2_BUF_FLAG_TIMECODE);

      if (fb->map_count > 0)
            b->flags |= V4L2_BUF_FLAG_MAPPED;

      b->index = fb->id;
      b->memory = (vcs->fb_queue.type == VINO_MEMORY_MMAP) ?
            V4L2_MEMORY_MMAP : V4L2_MEMORY_USERPTR;
      b->m.offset = fb->offset;
      b->bytesused = fb->data_size;
      b->length = fb->size;
      b->field = V4L2_FIELD_INTERLACED;
      b->sequence = fb->frame_counter;
      memcpy(&b->timestamp, &fb->timestamp,
             sizeof(struct timeval));
      // b->input ?

      dprintk("buffer %d: length = %d, bytesused = %d, offset = %d\n",
            fb->id, fb->size, fb->data_size, fb->offset);
}

static int vino_v4l2_querybuf(struct vino_channel_settings *vcs,
                        struct v4l2_buffer *b)
{
      if (vcs->reading)
            return -EBUSY;

      switch (b->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
            struct vino_framebuffer *fb;

            // TODO: check queue type
            if (b->index >= vino_queue_get_length(&vcs->fb_queue)) {
                  dprintk("invalid index = %d\n",
                         b->index);
                  return -EINVAL;
            }

            fb = vino_queue_get_buffer(&vcs->fb_queue,
                                 b->index);
            if (fb == NULL) {
                  dprintk("vino_queue_get_buffer() failed");
                  return -EINVAL;
            }

            vino_v4l2_get_buffer_status(vcs, fb, b);
            break;
      }
      case V4L2_BUF_TYPE_VIDEO_OVERLAY:
      default:
            return -EINVAL;
      }

      return 0;
}

static int vino_v4l2_qbuf(struct vino_channel_settings *vcs,
                    struct v4l2_buffer *b)
{
      if (vcs->reading)
            return -EBUSY;

      switch (b->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
            struct vino_framebuffer *fb;
            int ret;

            // TODO: check queue type
            if (b->memory != V4L2_MEMORY_MMAP) {
                  dprintk("type not mmap\n");
                  return -EINVAL;
            }

            fb = vino_capture_enqueue(vcs, b->index);
            if (fb == NULL)
                  return -EINVAL;

            vino_v4l2_get_buffer_status(vcs, fb, b);

            if (vcs->streaming) {
                  ret = vino_capture_next(vcs, 1);
                  if (ret)
                        return ret;
            }
            break;
      }
      case V4L2_BUF_TYPE_VIDEO_OVERLAY:
      default:
            return -EINVAL;
      }

      return 0;
}

static int vino_v4l2_dqbuf(struct vino_channel_settings *vcs,
                     struct v4l2_buffer *b,
                     unsigned int nonblocking)
{
      if (vcs->reading)
            return -EBUSY;

      switch (b->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
            struct vino_framebuffer *fb;
            unsigned int incoming, outgoing;
            int err;

            // TODO: check queue type

            err = vino_queue_get_incoming(&vcs->fb_queue, &incoming);
            if (err) {
                  dprintk("vino_queue_get_incoming() failed\n");
                  return -EINVAL;
            }
            err = vino_queue_get_outgoing(&vcs->fb_queue, &outgoing);
            if (err) {
                  dprintk("vino_queue_get_outgoing() failed\n");
                  return -EINVAL;
            }

            dprintk("incoming = %d, outgoing = %d\n", incoming, outgoing);

            if (outgoing == 0) {
                  if (incoming == 0) {
                        dprintk("no incoming or outgoing buffers\n");
                        return -EINVAL;
                  }
                  if (nonblocking) {
                        dprintk("non-blocking I/O was selected and "
                              "there are no buffers to dequeue\n");
                        return -EAGAIN;
                  }

                  err = vino_wait_for_frame(vcs);
                  if (err) {
                        err = vino_wait_for_frame(vcs);
                        if (err) {
                              /* interrupted or
                               * no frames captured because
                               * of frame skipping */
                              // vino_capture_failed(vcs);
                              return -EIO;
                        }
                  }
            }

            fb = vino_queue_remove(&vcs->fb_queue, &b->index);
            if (fb == NULL) {
                  dprintk("vino_queue_remove() failed\n");
                  return -EINVAL;
            }

            err = vino_check_buffer(vcs, fb);

            vino_v4l2_get_buffer_status(vcs, fb, b);

            if (err)
                  return -EIO;

            break;
      }
      case V4L2_BUF_TYPE_VIDEO_OVERLAY:
      default:
            return -EINVAL;
      }

      return 0;
}

static int vino_v4l2_streamon(struct vino_channel_settings *vcs)
{
      unsigned int incoming;
      int ret;
      if (vcs->reading)
            return -EBUSY;

      if (vcs->streaming)
            return 0;

      // TODO: check queue type

      if (vino_queue_get_length(&vcs->fb_queue) < 1) {
            dprintk("no buffers allocated\n");
            return -EINVAL;
      }

      ret = vino_queue_get_incoming(&vcs->fb_queue, &incoming);
      if (ret) {
            dprintk("vino_queue_get_incoming() failed\n");
            return -EINVAL;
      }

      vcs->streaming = 1;

      if (incoming > 0) {
            ret = vino_capture_next(vcs, 1);
            if (ret) {
                  vcs->streaming = 0;

                  dprintk("couldn't start capture\n");
                  return -EINVAL;
            }
      }

      return 0;
}

static int vino_v4l2_streamoff(struct vino_channel_settings *vcs)
{
      if (vcs->reading)
            return -EBUSY;

      if (!vcs->streaming)
            return 0;

      vcs->streaming = 0;
      vino_capture_stop(vcs);

      return 0;
}

static int vino_v4l2_queryctrl(struct vino_channel_settings *vcs,
                         struct v4l2_queryctrl *queryctrl)
{
      unsigned long flags;
      int i;
      int err = 0;

      spin_lock_irqsave(&vino_drvdata->input_lock, flags);

      switch (vcs->input) {
      case VINO_INPUT_D1:
            for (i = 0; i < VINO_INDYCAM_V4L2_CONTROL_COUNT; i++) {
                  if (vino_indycam_v4l2_controls[i].id ==
                      queryctrl->id) {
                        memcpy(queryctrl,
                               &vino_indycam_v4l2_controls[i],
                               sizeof(struct v4l2_queryctrl));
                        queryctrl->reserved[0] = 0;
                        goto found;
                  }
            }

            err =  -EINVAL;
            break;
      case VINO_INPUT_COMPOSITE:
      case VINO_INPUT_SVIDEO:
            for (i = 0; i < VINO_SAA7191_V4L2_CONTROL_COUNT; i++) {
                  if (vino_saa7191_v4l2_controls[i].id ==
                      queryctrl->id) {
                        memcpy(queryctrl,
                               &vino_saa7191_v4l2_controls[i],
                               sizeof(struct v4l2_queryctrl));
                        queryctrl->reserved[0] = 0;
                        goto found;
                  }
            }

            err =  -EINVAL;
            break;
      default:
            err =  -EINVAL;
      }

 found:
      spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

      return err;
}

static int vino_v4l2_g_ctrl(struct vino_channel_settings *vcs,
                      struct v4l2_control *control)
{
      unsigned long flags;
      int i;
      int err = 0;

      spin_lock_irqsave(&vino_drvdata->input_lock, flags);

      switch (vcs->input) {
      case VINO_INPUT_D1: {
            struct indycam_control indycam_ctrl;

            for (i = 0; i < VINO_INDYCAM_V4L2_CONTROL_COUNT; i++) {
                  if (vino_indycam_v4l2_controls[i].id ==
                      control->id) {
                        goto found1;
                  }
            }

            err = -EINVAL;
            goto out;

found1:
            indycam_ctrl.type = vino_indycam_v4l2_controls[i].reserved[0];

            err = i2c_camera_command(DECODER_INDYCAM_GET_CONTROL,
                               &indycam_ctrl);
            if (err) {
                  err = -EINVAL;
                  goto out;
            }

            control->value = indycam_ctrl.value;
            break;
      }
      case VINO_INPUT_COMPOSITE:
      case VINO_INPUT_SVIDEO: {
            struct saa7191_control saa7191_ctrl;

            for (i = 0; i < VINO_SAA7191_V4L2_CONTROL_COUNT; i++) {
                  if (vino_saa7191_v4l2_controls[i].id ==
                      control->id) {
                        goto found2;
                  }
            }

            err = -EINVAL;
            goto out;

found2:
            saa7191_ctrl.type = vino_saa7191_v4l2_controls[i].reserved[0];

            err = i2c_decoder_command(DECODER_SAA7191_GET_CONTROL,
                                &saa7191_ctrl);
            if (err) {
                  err = -EINVAL;
                  goto out;
            }

            control->value = saa7191_ctrl.value;
            break;
      }
      default:
            err =  -EINVAL;
      }

out:
      spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

      return err;
}

static int vino_v4l2_s_ctrl(struct vino_channel_settings *vcs,
                      struct v4l2_control *control)
{
      unsigned long flags;
      int i;
      int err = 0;

      spin_lock_irqsave(&vino_drvdata->input_lock, flags);

      if (!vino_is_input_owner(vcs)) {
            err = -EBUSY;
            goto out;
      }

      switch (vcs->input) {
      case VINO_INPUT_D1: {
            struct indycam_control indycam_ctrl;

            for (i = 0; i < VINO_INDYCAM_V4L2_CONTROL_COUNT; i++) {
                  if (vino_indycam_v4l2_controls[i].id ==
                      control->id) {
                        if ((control->value >=
                             vino_indycam_v4l2_controls[i].minimum)
                            && (control->value <=
                              vino_indycam_v4l2_controls[i].
                              maximum)) {
                              goto found1;
                        } else {
                              err = -ERANGE;
                              goto out;
                        }
                  }
            }

            err = -EINVAL;
            goto out;

found1:
            indycam_ctrl.type = vino_indycam_v4l2_controls[i].reserved[0];
            indycam_ctrl.value = control->value;

            err = i2c_camera_command(DECODER_INDYCAM_SET_CONTROL,
                               &indycam_ctrl);
            if (err)
                  err = -EINVAL;
            break;
      }
      case VINO_INPUT_COMPOSITE:
      case VINO_INPUT_SVIDEO: {
            struct saa7191_control saa7191_ctrl;

            for (i = 0; i < VINO_SAA7191_V4L2_CONTROL_COUNT; i++) {
                  if (vino_saa7191_v4l2_controls[i].id ==
                      control->id) {
                        if ((control->value >=
                             vino_saa7191_v4l2_controls[i].minimum)
                            && (control->value <=
                              vino_saa7191_v4l2_controls[i].
                              maximum)) {
                              goto found2;
                        } else {
                              err = -ERANGE;
                              goto out;
                        }
                  }
            }
            err = -EINVAL;
            goto out;

found2:
            saa7191_ctrl.type = vino_saa7191_v4l2_controls[i].reserved[0];
            saa7191_ctrl.value = control->value;

            err = i2c_decoder_command(DECODER_SAA7191_SET_CONTROL,
                                &saa7191_ctrl);
            if (err)
                  err = -EINVAL;
            break;
      }
      default:
            err =  -EINVAL;
      }

out:
      spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);

      return err;
}

/* File operations */

static int vino_open(struct inode *inode, struct file *file)
{
      struct video_device *dev = video_devdata(file);
      struct vino_channel_settings *vcs = video_get_drvdata(dev);
      int ret = 0;
      dprintk("open(): channel = %c\n",
             (vcs->channel == VINO_CHANNEL_A) ? 'A' : 'B');

      mutex_lock(&vcs->mutex);

      if (vcs->users) {
            dprintk("open(): driver busy\n");
            ret = -EBUSY;
            goto out;
      }

      ret = vino_acquire_input(vcs);
      if (ret) {
            dprintk("open(): vino_acquire_input() failed\n");
            goto out;
      }

      vcs->users++;

 out:
      mutex_unlock(&vcs->mutex);

      dprintk("open(): %s!\n", ret ? "failed" : "complete");

      return ret;
}

static int vino_close(struct inode *inode, struct file *file)
{
      struct video_device *dev = video_devdata(file);
      struct vino_channel_settings *vcs = video_get_drvdata(dev);
      dprintk("close():\n");

      mutex_lock(&vcs->mutex);

      vcs->users--;

      if (!vcs->users) {
            vino_release_input(vcs);

            /* stop DMA and free buffers */
            vino_capture_stop(vcs);
            vino_queue_free(&vcs->fb_queue);
      }

      mutex_unlock(&vcs->mutex);

      return 0;
}

static void vino_vm_open(struct vm_area_struct *vma)
{
      struct vino_framebuffer *fb = vma->vm_private_data;

      fb->map_count++;
      dprintk("vino_vm_open(): count = %d\n", fb->map_count);
}

static void vino_vm_close(struct vm_area_struct *vma)
{
      struct vino_framebuffer *fb = vma->vm_private_data;

      fb->map_count--;
      dprintk("vino_vm_close(): count = %d\n", fb->map_count);
}

static struct vm_operations_struct vino_vm_ops = {
      .open = vino_vm_open,
      .close      = vino_vm_close,
};

static int vino_mmap(struct file *file, struct vm_area_struct *vma)
{
      struct video_device *dev = video_devdata(file);
      struct vino_channel_settings *vcs = video_get_drvdata(dev);

      unsigned long start = vma->vm_start;
      unsigned long size = vma->vm_end - vma->vm_start;
      unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;

      struct vino_framebuffer *fb = NULL;
      unsigned int i, length;
      int ret = 0;

      dprintk("mmap():\n");

      // TODO: reject mmap if already mapped

      if (mutex_lock_interruptible(&vcs->mutex))
            return -EINTR;

      if (vcs->reading) {
            ret = -EBUSY;
            goto out;
      }

      // TODO: check queue type

      if (!(vma->vm_flags & VM_WRITE)) {
            dprintk("mmap(): app bug: PROT_WRITE please\n");
            ret = -EINVAL;
            goto out;
      }
      if (!(vma->vm_flags & VM_SHARED)) {
            dprintk("mmap(): app bug: MAP_SHARED please\n");
            ret = -EINVAL;
            goto out;
      }

      /* find the correct buffer using offset */
      length = vino_queue_get_length(&vcs->fb_queue);
      if (length == 0) {
            dprintk("mmap(): queue not initialized\n");
            ret = -EINVAL;
            goto out;
      }

      for (i = 0; i < length; i++) {
            fb = vino_queue_get_buffer(&vcs->fb_queue, i);
            if (fb == NULL) {
                  dprintk("mmap(): vino_queue_get_buffer() failed\n");
                  ret = -EINVAL;
                  goto out;
            }

            if (fb->offset == offset)
                  goto found;
      }

      dprintk("mmap(): invalid offset = %lu\n", offset);
      ret = -EINVAL;
      goto out;

found:
      dprintk("mmap(): buffer = %d\n", i);

      if (size > (fb->desc_table.page_count * PAGE_SIZE)) {
            dprintk("mmap(): failed: size = %lu > %lu\n",
                  size, fb->desc_table.page_count * PAGE_SIZE);
            ret = -EINVAL;
            goto out;
      }

      for (i = 0; i < fb->desc_table.page_count; i++) {
            unsigned long pfn =
                  virt_to_phys((void *)fb->desc_table.virtual[i]) >>
                  PAGE_SHIFT;

            if (size < PAGE_SIZE)
                  break;

            // protection was: PAGE_READONLY
            if (remap_pfn_range(vma, start, pfn, PAGE_SIZE,
                            vma->vm_page_prot)) {
                  dprintk("mmap(): remap_pfn_range() failed\n");
                  ret = -EAGAIN;
                  goto out;
            }

            start += PAGE_SIZE;
            size -= PAGE_SIZE;
      }

      fb->map_count = 1;

      vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
      vma->vm_flags &= ~VM_IO;
      vma->vm_private_data = fb;
      vma->vm_file = file;
      vma->vm_ops = &vino_vm_ops;

out:
      mutex_unlock(&vcs->mutex);

      return ret;
}

static unsigned int vino_poll(struct file *file, poll_table *pt)
{
      struct video_device *dev = video_devdata(file);
      struct vino_channel_settings *vcs = video_get_drvdata(dev);
      unsigned int outgoing;
      unsigned int ret = 0;

      // lock mutex (?)
      // TODO: this has to be corrected for different read modes

      dprintk("poll():\n");

      if (vino_queue_get_outgoing(&vcs->fb_queue, &outgoing)) {
            dprintk("poll(): vino_queue_get_outgoing() failed\n");
            ret = POLLERR;
            goto error;
      }
      if (outgoing > 0)
            goto over;

      poll_wait(file, &vcs->fb_queue.frame_wait_queue, pt);

      if (vino_queue_get_outgoing(&vcs->fb_queue, &outgoing)) {
            dprintk("poll(): vino_queue_get_outgoing() failed\n");
            ret = POLLERR;
            goto error;
      }

over:
      dprintk("poll(): data %savailable\n",
            (outgoing > 0) ? "" : "not ");

      if (outgoing > 0)
            ret = POLLIN | POLLRDNORM;

error:

      return ret;
}

static int vino_do_ioctl(struct inode *inode, struct file *file,
                  unsigned int cmd, void *arg)
{
      struct video_device *dev = video_devdata(file);
      struct vino_channel_settings *vcs = video_get_drvdata(dev);

#ifdef VINO_DEBUG
      switch (_IOC_TYPE(cmd)) {
      case 'v':
            dprintk("ioctl(): V4L1 unsupported (0x%08x)\n", cmd);
            break;
      case 'V':
            dprintk("ioctl(): V4L2 %s (0x%08x)\n",
                  v4l2_ioctl_names[_IOC_NR(cmd)], cmd);
            break;
      default:
            dprintk("ioctl(): unsupported command 0x%08x\n", cmd);
      }
#endif

      switch (cmd) {
      /* V4L2 interface */
      case VIDIOC_QUERYCAP: {
            vino_v4l2_querycap(arg);
            break;
      }
      case VIDIOC_ENUMINPUT: {
            return vino_v4l2_enuminput(vcs, arg);
      }
      case VIDIOC_G_INPUT: {
            return vino_v4l2_g_input(vcs, arg);
      }
      case VIDIOC_S_INPUT: {
            return vino_v4l2_s_input(vcs, arg);
      }
      case VIDIOC_ENUMSTD: {
            return vino_v4l2_enumstd(vcs, arg);
      }
      case VIDIOC_QUERYSTD: {
            return vino_v4l2_querystd(vcs, arg);
      }
      case VIDIOC_G_STD: {
            return vino_v4l2_g_std(vcs, arg);
      }
      case VIDIOC_S_STD: {
            return vino_v4l2_s_std(vcs, arg);
      }
      case VIDIOC_ENUM_FMT: {
            return vino_v4l2_enum_fmt(vcs, arg);
      }
      case VIDIOC_TRY_FMT: {
            return vino_v4l2_try_fmt(vcs, arg);
      }
      case VIDIOC_G_FMT: {
            return vino_v4l2_g_fmt(vcs, arg);
      }
      case VIDIOC_S_FMT: {
            return vino_v4l2_s_fmt(vcs, arg);
      }
      case VIDIOC_CROPCAP: {
            return vino_v4l2_cropcap(vcs, arg);
      }
      case VIDIOC_G_CROP: {
            return vino_v4l2_g_crop(vcs, arg);
      }
      case VIDIOC_S_CROP: {
            return vino_v4l2_s_crop(vcs, arg);
      }
      case VIDIOC_G_PARM: {
            return vino_v4l2_g_parm(vcs, arg);
      }
      case VIDIOC_S_PARM: {
            return vino_v4l2_s_parm(vcs, arg);
      }
      case VIDIOC_REQBUFS: {
            return vino_v4l2_reqbufs(vcs, arg);
      }
      case VIDIOC_QUERYBUF: {
            return vino_v4l2_querybuf(vcs, arg);
      }
      case VIDIOC_QBUF: {
            return vino_v4l2_qbuf(vcs, arg);
      }
      case VIDIOC_DQBUF: {
            return vino_v4l2_dqbuf(vcs, arg, file->f_flags & O_NONBLOCK);
      }
      case VIDIOC_STREAMON: {
            return vino_v4l2_streamon(vcs);
      }
      case VIDIOC_STREAMOFF: {
            return vino_v4l2_streamoff(vcs);
      }
      case VIDIOC_QUERYCTRL: {
            return vino_v4l2_queryctrl(vcs, arg);
      }
      case VIDIOC_G_CTRL: {
            return vino_v4l2_g_ctrl(vcs, arg);
      }
      case VIDIOC_S_CTRL: {
            return vino_v4l2_s_ctrl(vcs, arg);
      }
      default:
            return -ENOIOCTLCMD;
      }

      return 0;
}

static int vino_ioctl(struct inode *inode, struct file *file,
                  unsigned int cmd, unsigned long arg)
{
      struct video_device *dev = video_devdata(file);
      struct vino_channel_settings *vcs = video_get_drvdata(dev);
      int ret;

      if (mutex_lock_interruptible(&vcs->mutex))
            return -EINTR;

      ret = video_usercopy(inode, file, cmd, arg, vino_do_ioctl);

      mutex_unlock(&vcs->mutex);

      return ret;
}

/* Initialization and cleanup */

// __initdata
static int vino_init_stage = 0;

static const struct file_operations vino_fops = {
      .owner            = THIS_MODULE,
      .open       = vino_open,
      .release    = vino_close,
      .ioctl            = vino_ioctl,
      .mmap       = vino_mmap,
      .poll       = vino_poll,
      .llseek           = no_llseek,
};

static struct video_device v4l_device_template = {
      .name       = "NOT SET",
      //.type           = VID_TYPE_CAPTURE | VID_TYPE_SUBCAPTURE |
      //    VID_TYPE_CLIPPING | VID_TYPE_SCALES, VID_TYPE_OVERLAY
      .fops       = &vino_fops,
      .minor            = -1,
};

static void vino_module_cleanup(int stage)
{
      switch(stage) {
      case 10:
            video_unregister_device(vino_drvdata->b.v4l_device);
            vino_drvdata->b.v4l_device = NULL;
      case 9:
            video_unregister_device(vino_drvdata->a.v4l_device);
            vino_drvdata->a.v4l_device = NULL;
      case 8:
            vino_i2c_del_bus();
      case 7:
            free_irq(SGI_VINO_IRQ, NULL);
      case 6:
            if (vino_drvdata->b.v4l_device) {
                  video_device_release(vino_drvdata->b.v4l_device);
                  vino_drvdata->b.v4l_device = NULL;
            }
      case 5:
            if (vino_drvdata->a.v4l_device) {
                  video_device_release(vino_drvdata->a.v4l_device);
                  vino_drvdata->a.v4l_device = NULL;
            }
      case 4:
            /* all entries in dma_cpu dummy table have the same address */
            dma_unmap_single(NULL,
                         vino_drvdata->dummy_desc_table.dma_cpu[0],
                         PAGE_SIZE, DMA_FROM_DEVICE);
            dma_free_coherent(NULL, VINO_DUMMY_DESC_COUNT
                          * sizeof(dma_addr_t),
                          (void *)vino_drvdata->
                          dummy_desc_table.dma_cpu,
                          vino_drvdata->dummy_desc_table.dma);
      case 3:
            free_page(vino_drvdata->dummy_page);
      case 2:
            kfree(vino_drvdata);
      case 1:
            iounmap(vino);
      case 0:
            break;
      default:
            dprintk("vino_module_cleanup(): invalid cleanup stage = %d\n",
                  stage);
      }
}

static int vino_probe(void)
{
      unsigned long rev_id;

      if (ip22_is_fullhouse()) {
            printk(KERN_ERR "VINO doesn't exist in IP22 Fullhouse\n");
            return -ENODEV;
      }

      if (!(sgimc->systemid & SGIMC_SYSID_EPRESENT)) {
            printk(KERN_ERR "VINO is not found (EISA BUS not present)\n");
            return -ENODEV;
      }

      vino = (struct sgi_vino *)ioremap(VINO_BASE, sizeof(struct sgi_vino));
      if (!vino) {
            printk(KERN_ERR "VINO: ioremap() failed\n");
            return -EIO;
      }
      vino_init_stage++;

      if (get_dbe(rev_id, &(vino->rev_id))) {
            printk(KERN_ERR "Failed to read VINO revision register\n");
            vino_module_cleanup(vino_init_stage);
            return -ENODEV;
      }

      if (VINO_ID_VALUE(rev_id) != VINO_CHIP_ID) {
            printk(KERN_ERR "Unknown VINO chip ID (Rev/ID: 0x%02lx)\n",
                   rev_id);
            vino_module_cleanup(vino_init_stage);
            return -ENODEV;
      }

      printk(KERN_INFO "VINO revision %ld found\n", VINO_REV_NUM(rev_id));

      return 0;
}

static int vino_init(void)
{
      dma_addr_t dma_dummy_address;
      int i;

      vino_drvdata = kzalloc(sizeof(struct vino_settings), GFP_KERNEL);
      if (!vino_drvdata) {
            vino_module_cleanup(vino_init_stage);
            return -ENOMEM;
      }
      vino_init_stage++;

      /* create a dummy dma descriptor */
      vino_drvdata->dummy_page = get_zeroed_page(GFP_KERNEL | GFP_DMA);
      if (!vino_drvdata->dummy_page) {
            vino_module_cleanup(vino_init_stage);
            return -ENOMEM;
      }
      vino_init_stage++;

      // TODO: use page_count in dummy_desc_table

      vino_drvdata->dummy_desc_table.dma_cpu =
            dma_alloc_coherent(NULL,
            VINO_DUMMY_DESC_COUNT * sizeof(dma_addr_t),
            &vino_drvdata->dummy_desc_table.dma,
            GFP_KERNEL | GFP_DMA);
      if (!vino_drvdata->dummy_desc_table.dma_cpu) {
            vino_module_cleanup(vino_init_stage);
            return -ENOMEM;
      }
      vino_init_stage++;

      dma_dummy_address = dma_map_single(NULL,
                                 (void *)vino_drvdata->dummy_page,
                              PAGE_SIZE, DMA_FROM_DEVICE);
      for (i = 0; i < VINO_DUMMY_DESC_COUNT; i++) {
            vino_drvdata->dummy_desc_table.dma_cpu[i] = dma_dummy_address;
      }

      /* initialize VINO */

      vino->control = 0;
      vino->a.next_4_desc = vino_drvdata->dummy_desc_table.dma;
      vino->b.next_4_desc = vino_drvdata->dummy_desc_table.dma;
      udelay(VINO_DESC_FETCH_DELAY);

      vino->intr_status = 0;

      vino->a.fifo_thres = VINO_FIFO_THRESHOLD_DEFAULT;
      vino->b.fifo_thres = VINO_FIFO_THRESHOLD_DEFAULT;

      return 0;
}

static int vino_init_channel_settings(struct vino_channel_settings *vcs,
                         unsigned int channel, const char *name)
{
      vcs->channel = channel;
      vcs->input = VINO_INPUT_NONE;
      vcs->alpha = 0;
      vcs->users = 0;
      vcs->data_format = VINO_DATA_FMT_GREY;
      vcs->data_norm = VINO_DATA_NORM_NTSC;
      vcs->decimation = 1;
      vino_set_default_clipping(vcs);
      vino_set_default_framerate(vcs);

      vcs->capturing = 0;

      mutex_init(&vcs->mutex);
      spin_lock_init(&vcs->capture_lock);

      mutex_init(&vcs->fb_queue.queue_mutex);
      spin_lock_init(&vcs->fb_queue.queue_lock);
      init_waitqueue_head(&vcs->fb_queue.frame_wait_queue);

      vcs->v4l_device = video_device_alloc();
      if (!vcs->v4l_device) {
            vino_module_cleanup(vino_init_stage);
            return -ENOMEM;
      }
      vino_init_stage++;

      memcpy(vcs->v4l_device, &v4l_device_template,
             sizeof(struct video_device));
      strcpy(vcs->v4l_device->name, name);
      vcs->v4l_device->release = video_device_release;

      video_set_drvdata(vcs->v4l_device, vcs);

      return 0;
}

static int __init vino_module_init(void)
{
      int ret;

      printk(KERN_INFO "SGI VINO driver version %s\n",
             VINO_MODULE_VERSION);

      ret = vino_probe();
      if (ret)
            return ret;

      ret = vino_init();
      if (ret)
            return ret;

      /* initialize data structures */

      spin_lock_init(&vino_drvdata->vino_lock);
      spin_lock_init(&vino_drvdata->input_lock);

      ret = vino_init_channel_settings(&vino_drvdata->a, VINO_CHANNEL_A,
                            vino_v4l_device_name_a);
      if (ret)
            return ret;

      ret = vino_init_channel_settings(&vino_drvdata->b, VINO_CHANNEL_B,
                            vino_v4l_device_name_b);
      if (ret)
            return ret;

      /* initialize hardware and register V4L devices */

      ret = request_irq(SGI_VINO_IRQ, vino_interrupt, 0,
            vino_driver_description, NULL);
      if (ret) {
            printk(KERN_ERR "VINO: requesting IRQ %02d failed\n",
                   SGI_VINO_IRQ);
            vino_module_cleanup(vino_init_stage);
            return -EAGAIN;
      }
      vino_init_stage++;

      ret = vino_i2c_add_bus();
      if (ret) {
            printk(KERN_ERR "VINO I2C bus registration failed\n");
            vino_module_cleanup(vino_init_stage);
            return ret;
      }
      vino_init_stage++;

      ret = video_register_device(vino_drvdata->a.v4l_device,
                            VFL_TYPE_GRABBER, -1);
      if (ret < 0) {
            printk(KERN_ERR "VINO channel A Video4Linux-device "
                   "registration failed\n");
            vino_module_cleanup(vino_init_stage);
            return -EINVAL;
      }
      vino_init_stage++;

      ret = video_register_device(vino_drvdata->b.v4l_device,
                            VFL_TYPE_GRABBER, -1);
      if (ret < 0) {
            printk(KERN_ERR "VINO channel B Video4Linux-device "
                   "registration failed\n");
            vino_module_cleanup(vino_init_stage);
            return -EINVAL;
      }
      vino_init_stage++;

#if defined(CONFIG_KMOD) && defined(MODULE)
      request_module("saa7191");
      request_module("indycam");
#endif

      dprintk("init complete!\n");

      return 0;
}

static void __exit vino_module_exit(void)
{
      dprintk("exiting, stage = %d ...\n", vino_init_stage);
      vino_module_cleanup(vino_init_stage);
      dprintk("cleanup complete, exit!\n");
}

module_init(vino_module_init);
module_exit(vino_module_exit);

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