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cpia2_v4l.c

/****************************************************************************
 *
 *  Filename: cpia2_v4l.c
 *
 *  Copyright 2001, STMicrolectronics, Inc.
 *      Contact:  steve.miller@st.com
 *  Copyright 2001,2005, Scott J. Bertin <scottbertin@yahoo.com>
 *
 *  Description:
 *     This is a USB driver for CPia2 based video cameras.
 *     The infrastructure of this driver is based on the cpia usb driver by
 *     Jochen Scharrlach and Johannes Erdfeldt.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  Stripped of 2.4 stuff ready for main kernel submit by
 *          Alan Cox <alan@redhat.com>
 ****************************************************************************/

#include <linux/version.h>


#include <linux/module.h>
#include <linux/time.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/init.h>

#include "cpia2.h"
#include "cpia2dev.h"


//#define _CPIA2_DEBUG_

#define MAKE_STRING_1(x)      #x
#define MAKE_STRING(x)  MAKE_STRING_1(x)

static int video_nr = -1;
module_param(video_nr, int, 0);
MODULE_PARM_DESC(video_nr,"video device to register (0=/dev/video0, etc)");

static int buffer_size = 68*1024;
module_param(buffer_size, int, 0);
MODULE_PARM_DESC(buffer_size, "Size for each frame buffer in bytes (default 68k)");

static int num_buffers = 3;
module_param(num_buffers, int, 0);
MODULE_PARM_DESC(num_buffers, "Number of frame buffers (1-"
             MAKE_STRING(VIDEO_MAX_FRAME) ", default 3)");

static int alternate = DEFAULT_ALT;
module_param(alternate, int, 0);
MODULE_PARM_DESC(alternate, "USB Alternate (" MAKE_STRING(USBIF_ISO_1) "-"
             MAKE_STRING(USBIF_ISO_6) ", default "
             MAKE_STRING(DEFAULT_ALT) ")");

static int flicker_freq = 60;
module_param(flicker_freq, int, 0);
MODULE_PARM_DESC(flicker_freq, "Flicker frequency (" MAKE_STRING(50) "or"
             MAKE_STRING(60) ", default "
             MAKE_STRING(60) ")");

static int flicker_mode = NEVER_FLICKER;
module_param(flicker_mode, int, 0);
MODULE_PARM_DESC(flicker_mode,
             "Flicker supression (" MAKE_STRING(NEVER_FLICKER) "or"
             MAKE_STRING(ANTI_FLICKER_ON) ", default "
             MAKE_STRING(NEVER_FLICKER) ")");

MODULE_AUTHOR("Steve Miller (STMicroelectronics) <steve.miller@st.com>");
MODULE_DESCRIPTION("V4L-driver for STMicroelectronics CPiA2 based cameras");
MODULE_SUPPORTED_DEVICE("video");
MODULE_LICENSE("GPL");

#define ABOUT "V4L-Driver for Vision CPiA2 based cameras"

struct control_menu_info {
      int value;
      char name[32];
};

static struct control_menu_info framerate_controls[] =
{
      { CPIA2_VP_FRAMERATE_6_25, "6.25 fps" },
      { CPIA2_VP_FRAMERATE_7_5,  "7.5 fps"  },
      { CPIA2_VP_FRAMERATE_12_5, "12.5 fps" },
      { CPIA2_VP_FRAMERATE_15,   "15 fps"   },
      { CPIA2_VP_FRAMERATE_25,   "25 fps"   },
      { CPIA2_VP_FRAMERATE_30,   "30 fps"   },
};
#define NUM_FRAMERATE_CONTROLS (ARRAY_SIZE(framerate_controls))

static struct control_menu_info flicker_controls[] =
{
      { NEVER_FLICKER, "Off" },
      { FLICKER_50,    "50 Hz" },
      { FLICKER_60,    "60 Hz"  },
};
#define NUM_FLICKER_CONTROLS (ARRAY_SIZE(flicker_controls))

static struct control_menu_info lights_controls[] =
{
      { 0,   "Off" },
      { 64,  "Top" },
      { 128, "Bottom"  },
      { 192, "Both"  },
};
#define NUM_LIGHTS_CONTROLS (ARRAY_SIZE(lights_controls))
#define GPIO_LIGHTS_MASK 192

static struct v4l2_queryctrl controls[] = {
      {
            .id            = V4L2_CID_BRIGHTNESS,
            .type          = V4L2_CTRL_TYPE_INTEGER,
            .name          = "Brightness",
            .minimum       = 0,
            .maximum       = 255,
            .step          = 1,
            .default_value = DEFAULT_BRIGHTNESS,
      },
      {
            .id            = V4L2_CID_CONTRAST,
            .type          = V4L2_CTRL_TYPE_INTEGER,
            .name          = "Contrast",
            .minimum       = 0,
            .maximum       = 255,
            .step          = 1,
            .default_value = DEFAULT_CONTRAST,
      },
      {
            .id            = V4L2_CID_SATURATION,
            .type          = V4L2_CTRL_TYPE_INTEGER,
            .name          = "Saturation",
            .minimum       = 0,
            .maximum       = 255,
            .step          = 1,
            .default_value = DEFAULT_SATURATION,
      },
      {
            .id            = V4L2_CID_HFLIP,
            .type          = V4L2_CTRL_TYPE_BOOLEAN,
            .name          = "Mirror Horizontally",
            .minimum       = 0,
            .maximum       = 1,
            .step          = 1,
            .default_value = 0,
      },
      {
            .id            = V4L2_CID_VFLIP,
            .type          = V4L2_CTRL_TYPE_BOOLEAN,
            .name          = "Flip Vertically",
            .minimum       = 0,
            .maximum       = 1,
            .step          = 1,
            .default_value = 0,
      },
      {
            .id            = CPIA2_CID_TARGET_KB,
            .type          = V4L2_CTRL_TYPE_INTEGER,
            .name          = "Target KB",
            .minimum       = 0,
            .maximum       = 255,
            .step          = 1,
            .default_value = DEFAULT_TARGET_KB,
      },
      {
            .id            = CPIA2_CID_GPIO,
            .type          = V4L2_CTRL_TYPE_INTEGER,
            .name          = "GPIO",
            .minimum       = 0,
            .maximum       = 255,
            .step          = 1,
            .default_value = 0,
      },
      {
            .id            = CPIA2_CID_FLICKER_MODE,
            .type          = V4L2_CTRL_TYPE_MENU,
            .name          = "Flicker Reduction",
            .minimum       = 0,
            .maximum       = NUM_FLICKER_CONTROLS-1,
            .step          = 1,
            .default_value = 0,
      },
      {
            .id            = CPIA2_CID_FRAMERATE,
            .type          = V4L2_CTRL_TYPE_MENU,
            .name          = "Framerate",
            .minimum       = 0,
            .maximum       = NUM_FRAMERATE_CONTROLS-1,
            .step          = 1,
            .default_value = NUM_FRAMERATE_CONTROLS-1,
      },
      {
            .id            = CPIA2_CID_USB_ALT,
            .type          = V4L2_CTRL_TYPE_INTEGER,
            .name          = "USB Alternate",
            .minimum       = USBIF_ISO_1,
            .maximum       = USBIF_ISO_6,
            .step          = 1,
            .default_value = DEFAULT_ALT,
      },
      {
            .id            = CPIA2_CID_LIGHTS,
            .type          = V4L2_CTRL_TYPE_MENU,
            .name          = "Lights",
            .minimum       = 0,
            .maximum       = NUM_LIGHTS_CONTROLS-1,
            .step          = 1,
            .default_value = 0,
      },
      {
            .id            = CPIA2_CID_RESET_CAMERA,
            .type          = V4L2_CTRL_TYPE_BUTTON,
            .name          = "Reset Camera",
            .minimum       = 0,
            .maximum       = 0,
            .step          = 0,
            .default_value = 0,
      },
};
#define NUM_CONTROLS (ARRAY_SIZE(controls))


/******************************************************************************
 *
 *  cpia2_open
 *
 *****************************************************************************/
static int cpia2_open(struct inode *inode, struct file *file)
{
      struct video_device *dev = video_devdata(file);
      struct camera_data *cam = video_get_drvdata(dev);
      int retval = 0;

      if (!cam) {
            ERR("Internal error, camera_data not found!\n");
            return -ENODEV;
      }

      if(mutex_lock_interruptible(&cam->busy_lock))
            return -ERESTARTSYS;

      if(!cam->present) {
            retval = -ENODEV;
            goto err_return;
      }

      if (cam->open_count > 0) {
            goto skip_init;
      }

      if (cpia2_allocate_buffers(cam)) {
            retval = -ENOMEM;
            goto err_return;
      }

      /* reset the camera */
      if (cpia2_reset_camera(cam) < 0) {
            retval = -EIO;
            goto err_return;
      }

      cam->APP_len = 0;
      cam->COM_len = 0;

skip_init:
      {
            struct cpia2_fh *fh = kmalloc(sizeof(*fh),GFP_KERNEL);
            if(!fh) {
                  retval = -ENOMEM;
                  goto err_return;
            }
            file->private_data = fh;
            fh->prio = V4L2_PRIORITY_UNSET;
            v4l2_prio_open(&cam->prio, &fh->prio);
            fh->mmapped = 0;
      }

      ++cam->open_count;

      cpia2_dbg_dump_registers(cam);

err_return:
      mutex_unlock(&cam->busy_lock);
      return retval;
}

/******************************************************************************
 *
 *  cpia2_close
 *
 *****************************************************************************/
static int cpia2_close(struct inode *inode, struct file *file)
{
      struct video_device *dev = video_devdata(file);
      struct camera_data *cam = video_get_drvdata(dev);
      struct cpia2_fh *fh = file->private_data;

      mutex_lock(&cam->busy_lock);

      if (cam->present &&
          (cam->open_count == 1
           || fh->prio == V4L2_PRIORITY_RECORD
          )) {
            cpia2_usb_stream_stop(cam);

            if(cam->open_count == 1) {
                  /* save camera state for later open */
                  cpia2_save_camera_state(cam);

                  cpia2_set_low_power(cam);
                  cpia2_free_buffers(cam);
            }
      }

      {
            if(fh->mmapped)
                  cam->mmapped = 0;
            v4l2_prio_close(&cam->prio,&fh->prio);
            file->private_data = NULL;
            kfree(fh);
      }

      if (--cam->open_count == 0) {
            cpia2_free_buffers(cam);
            if (!cam->present) {
                  video_unregister_device(dev);
                  mutex_unlock(&cam->busy_lock);
                  kfree(cam);
                  return 0;
            }
      }

      mutex_unlock(&cam->busy_lock);

      return 0;
}

/******************************************************************************
 *
 *  cpia2_v4l_read
 *
 *****************************************************************************/
static ssize_t cpia2_v4l_read(struct file *file, char __user *buf, size_t count,
                        loff_t *off)
{
      struct video_device *dev = video_devdata(file);
      struct camera_data *cam = video_get_drvdata(dev);
      int noblock = file->f_flags&O_NONBLOCK;

      struct cpia2_fh *fh = file->private_data;

      if(!cam)
            return -EINVAL;

      /* Priority check */
      if(fh->prio != V4L2_PRIORITY_RECORD) {
            return -EBUSY;
      }

      return cpia2_read(cam, buf, count, noblock);
}


/******************************************************************************
 *
 *  cpia2_v4l_poll
 *
 *****************************************************************************/
static unsigned int cpia2_v4l_poll(struct file *filp, struct poll_table_struct *wait)
{
      struct video_device *dev = video_devdata(filp);
      struct camera_data *cam = video_get_drvdata(dev);

      struct cpia2_fh *fh = filp->private_data;

      if(!cam)
            return POLLERR;

      /* Priority check */
      if(fh->prio != V4L2_PRIORITY_RECORD) {
            return POLLERR;
      }

      return cpia2_poll(cam, filp, wait);
}


/******************************************************************************
 *
 *  ioctl_cap_query
 *
 *****************************************************************************/
static int ioctl_cap_query(void *arg, struct camera_data *cam)
{
      struct video_capability *vc;
      int retval = 0;
      vc = arg;

      if (cam->params.pnp_id.product == 0x151)
            strcpy(vc->name, "QX5 Microscope");
      else
            strcpy(vc->name, "CPiA2 Camera");

      vc->type = VID_TYPE_CAPTURE | VID_TYPE_MJPEG_ENCODER;
      vc->channels = 1;
      vc->audios = 0;
      vc->minwidth = 176;     /* VIDEOSIZE_QCIF */
      vc->minheight = 144;
      switch (cam->params.version.sensor_flags) {
      case CPIA2_VP_SENSOR_FLAGS_500:
            vc->maxwidth = STV_IMAGE_VGA_COLS;
            vc->maxheight = STV_IMAGE_VGA_ROWS;
            break;
      case CPIA2_VP_SENSOR_FLAGS_410:
            vc->maxwidth = STV_IMAGE_CIF_COLS;
            vc->maxheight = STV_IMAGE_CIF_ROWS;
            break;
      default:
            return -EINVAL;
      }

      return retval;
}

/******************************************************************************
 *
 *  ioctl_get_channel
 *
 *****************************************************************************/
static int ioctl_get_channel(void *arg)
{
      int retval = 0;
      struct video_channel *v;
      v = arg;

      if (v->channel != 0)
            return -EINVAL;

      v->channel = 0;
      strcpy(v->name, "Camera");
      v->tuners = 0;
      v->flags = 0;
      v->type = VIDEO_TYPE_CAMERA;
      v->norm = 0;

      return retval;
}

/******************************************************************************
 *
 *  ioctl_set_channel
 *
 *****************************************************************************/
static int ioctl_set_channel(void *arg)
{
      struct video_channel *v;
      int retval = 0;
      v = arg;

      if (retval == 0 && v->channel != 0)
            retval = -EINVAL;

      return retval;
}

/******************************************************************************
 *
 *  ioctl_set_image_prop
 *
 *****************************************************************************/
static int ioctl_set_image_prop(void *arg, struct camera_data *cam)
{
      struct video_picture *vp;
      int retval = 0;
      vp = arg;

      /* brightness, color, contrast need no check 0-65535 */
      memcpy(&cam->vp, vp, sizeof(*vp));

      /* update cam->params.colorParams */
      cam->params.color_params.brightness = vp->brightness / 256;
      cam->params.color_params.saturation = vp->colour / 256;
      cam->params.color_params.contrast = vp->contrast / 256;

      DBG("Requested params: bright 0x%X, sat 0x%X, contrast 0x%X\n",
          cam->params.color_params.brightness,
          cam->params.color_params.saturation,
          cam->params.color_params.contrast);

      cpia2_set_color_params(cam);

      return retval;
}

static int sync(struct camera_data *cam, int frame_nr)
{
      struct framebuf *frame = &cam->buffers[frame_nr];

      while (1) {
            if (frame->status == FRAME_READY)
                  return 0;

            if (!cam->streaming) {
                  frame->status = FRAME_READY;
                  frame->length = 0;
                  return 0;
            }

            mutex_unlock(&cam->busy_lock);
            wait_event_interruptible(cam->wq_stream,
                               !cam->streaming ||
                               frame->status == FRAME_READY);
            mutex_lock(&cam->busy_lock);
            if (signal_pending(current))
                  return -ERESTARTSYS;
            if(!cam->present)
                  return -ENOTTY;
      }
}

/******************************************************************************
 *
 *  ioctl_set_window_size
 *
 *****************************************************************************/
static int ioctl_set_window_size(void *arg, struct camera_data *cam,
                         struct cpia2_fh *fh)
{
      /* copy_from_user, check validity, copy to internal structure */
      struct video_window *vw;
      int frame, err;
      vw = arg;

      if (vw->clipcount != 0) /* clipping not supported */
            return -EINVAL;

      if (vw->clips != NULL)  /* clipping not supported */
            return -EINVAL;

      /* Ensure that only this process can change the format. */
      err = v4l2_prio_change(&cam->prio, &fh->prio, V4L2_PRIORITY_RECORD);
      if(err != 0)
            return err;

      cam->pixelformat = V4L2_PIX_FMT_JPEG;

      /* Be sure to supply the Huffman tables, this isn't MJPEG */
      cam->params.compression.inhibit_htables = 0;

      /* we set the video window to something smaller or equal to what
       * is requested by the user???
       */
      DBG("Requested width = %d, height = %d\n", vw->width, vw->height);
      if (vw->width != cam->vw.width || vw->height != cam->vw.height) {
            cam->vw.width = vw->width;
            cam->vw.height = vw->height;
            cam->params.roi.width = vw->width;
            cam->params.roi.height = vw->height;
            cpia2_set_format(cam);
      }

      for (frame = 0; frame < cam->num_frames; ++frame) {
            if (cam->buffers[frame].status == FRAME_READING)
                  if ((err = sync(cam, frame)) < 0)
                        return err;

            cam->buffers[frame].status = FRAME_EMPTY;
      }

      return 0;
}

/******************************************************************************
 *
 *  ioctl_get_mbuf
 *
 *****************************************************************************/
static int ioctl_get_mbuf(void *arg, struct camera_data *cam)
{
      struct video_mbuf *vm;
      int i;
      vm = arg;

      memset(vm, 0, sizeof(*vm));
      vm->size = cam->frame_size*cam->num_frames;
      vm->frames = cam->num_frames;
      for (i = 0; i < cam->num_frames; i++)
            vm->offsets[i] = cam->frame_size * i;

      return 0;
}

/******************************************************************************
 *
 *  ioctl_mcapture
 *
 *****************************************************************************/
static int ioctl_mcapture(void *arg, struct camera_data *cam,
                    struct cpia2_fh *fh)
{
      struct video_mmap *vm;
      int video_size, err;
      vm = arg;

      if (vm->frame < 0 || vm->frame >= cam->num_frames)
            return -EINVAL;

      /* set video size */
      video_size = cpia2_match_video_size(vm->width, vm->height);
      if (cam->video_size < 0) {
            return -EINVAL;
      }

      /* Ensure that only this process can change the format. */
      err = v4l2_prio_change(&cam->prio, &fh->prio, V4L2_PRIORITY_RECORD);
      if(err != 0)
            return err;

      if (video_size != cam->video_size) {
            cam->video_size = video_size;
            cam->params.roi.width = vm->width;
            cam->params.roi.height = vm->height;
            cpia2_set_format(cam);
      }

      if (cam->buffers[vm->frame].status == FRAME_READING)
            if ((err=sync(cam, vm->frame)) < 0)
                  return err;

      cam->buffers[vm->frame].status = FRAME_EMPTY;

      return cpia2_usb_stream_start(cam,cam->params.camera_state.stream_mode);
}

/******************************************************************************
 *
 *  ioctl_sync
 *
 *****************************************************************************/
static int ioctl_sync(void *arg, struct camera_data *cam)
{
      int frame;

      frame = *(int*)arg;

      if (frame < 0 || frame >= cam->num_frames)
            return -EINVAL;

      return sync(cam, frame);
}


/******************************************************************************
 *
 *  ioctl_set_gpio
 *
 *****************************************************************************/

static int ioctl_set_gpio(void *arg, struct camera_data *cam)
{
      __u32 gpio_val;

      gpio_val = *(__u32*) arg;

      if (gpio_val &~ 0xFFU)
            return -EINVAL;

      return cpia2_set_gpio(cam, (unsigned char)gpio_val);
}

/******************************************************************************
 *
 *  ioctl_querycap
 *
 *  V4L2 device capabilities
 *
 *****************************************************************************/

static int ioctl_querycap(void *arg, struct camera_data *cam)
{
      struct v4l2_capability *vc = arg;

      memset(vc, 0, sizeof(*vc));
      strcpy(vc->driver, "cpia2");

      if (cam->params.pnp_id.product == 0x151)
            strcpy(vc->card, "QX5 Microscope");
      else
            strcpy(vc->card, "CPiA2 Camera");
      switch (cam->params.pnp_id.device_type) {
      case DEVICE_STV_672:
            strcat(vc->card, " (672/");
            break;
      case DEVICE_STV_676:
            strcat(vc->card, " (676/");
            break;
      default:
            strcat(vc->card, " (???/");
            break;
      }
      switch (cam->params.version.sensor_flags) {
      case CPIA2_VP_SENSOR_FLAGS_404:
            strcat(vc->card, "404)");
            break;
      case CPIA2_VP_SENSOR_FLAGS_407:
            strcat(vc->card, "407)");
            break;
      case CPIA2_VP_SENSOR_FLAGS_409:
            strcat(vc->card, "409)");
            break;
      case CPIA2_VP_SENSOR_FLAGS_410:
            strcat(vc->card, "410)");
            break;
      case CPIA2_VP_SENSOR_FLAGS_500:
            strcat(vc->card, "500)");
            break;
      default:
            strcat(vc->card, "???)");
            break;
      }

      if (usb_make_path(cam->dev, vc->bus_info, sizeof(vc->bus_info)) <0)
            memset(vc->bus_info,0, sizeof(vc->bus_info));

      vc->version = KERNEL_VERSION(CPIA2_MAJ_VER, CPIA2_MIN_VER,
                             CPIA2_PATCH_VER);

      vc->capabilities = V4L2_CAP_VIDEO_CAPTURE |
                     V4L2_CAP_READWRITE |
                     V4L2_CAP_STREAMING;

      return 0;
}

/******************************************************************************
 *
 *  ioctl_input
 *
 *  V4L2 input get/set/enumerate
 *
 *****************************************************************************/

static int ioctl_input(unsigned int ioclt_nr,void *arg,struct camera_data *cam)
{
      struct v4l2_input *i = arg;

      if(ioclt_nr  != VIDIOC_G_INPUT) {
            if (i->index != 0)
                   return -EINVAL;
      }

      memset(i, 0, sizeof(*i));
      strcpy(i->name, "Camera");
      i->type = V4L2_INPUT_TYPE_CAMERA;

      return 0;
}

/******************************************************************************
 *
 *  ioctl_enum_fmt
 *
 *  V4L2 format enumerate
 *
 *****************************************************************************/

static int ioctl_enum_fmt(void *arg,struct camera_data *cam)
{
      struct v4l2_fmtdesc *f = arg;
      int index = f->index;

      if (index < 0 || index > 1)
             return -EINVAL;

      memset(f, 0, sizeof(*f));
      f->index = index;
      f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
      f->flags = V4L2_FMT_FLAG_COMPRESSED;
      switch(index) {
      case 0:
            strcpy(f->description, "MJPEG");
            f->pixelformat = V4L2_PIX_FMT_MJPEG;
            break;
      case 1:
            strcpy(f->description, "JPEG");
            f->pixelformat = V4L2_PIX_FMT_JPEG;
            break;
      default:
            return -EINVAL;
      }

      return 0;
}

/******************************************************************************
 *
 *  ioctl_try_fmt
 *
 *  V4L2 format try
 *
 *****************************************************************************/

static int ioctl_try_fmt(void *arg,struct camera_data *cam)
{
      struct v4l2_format *f = arg;

      if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
             return -EINVAL;

      if (f->fmt.pix.pixelformat != V4L2_PIX_FMT_MJPEG &&
          f->fmt.pix.pixelformat != V4L2_PIX_FMT_JPEG)
             return -EINVAL;

      f->fmt.pix.field = V4L2_FIELD_NONE;
      f->fmt.pix.bytesperline = 0;
      f->fmt.pix.sizeimage = cam->frame_size;
      f->fmt.pix.colorspace = V4L2_COLORSPACE_JPEG;
      f->fmt.pix.priv = 0;

      switch (cpia2_match_video_size(f->fmt.pix.width, f->fmt.pix.height)) {
      case VIDEOSIZE_VGA:
            f->fmt.pix.width = 640;
            f->fmt.pix.height = 480;
            break;
      case VIDEOSIZE_CIF:
            f->fmt.pix.width = 352;
            f->fmt.pix.height = 288;
            break;
      case VIDEOSIZE_QVGA:
            f->fmt.pix.width = 320;
            f->fmt.pix.height = 240;
            break;
      case VIDEOSIZE_288_216:
            f->fmt.pix.width = 288;
            f->fmt.pix.height = 216;
            break;
      case VIDEOSIZE_256_192:
            f->fmt.pix.width = 256;
            f->fmt.pix.height = 192;
            break;
      case VIDEOSIZE_224_168:
            f->fmt.pix.width = 224;
            f->fmt.pix.height = 168;
            break;
      case VIDEOSIZE_192_144:
            f->fmt.pix.width = 192;
            f->fmt.pix.height = 144;
            break;
      case VIDEOSIZE_QCIF:
      default:
            f->fmt.pix.width = 176;
            f->fmt.pix.height = 144;
            break;
      }

      return 0;
}

/******************************************************************************
 *
 *  ioctl_set_fmt
 *
 *  V4L2 format set
 *
 *****************************************************************************/

static int ioctl_set_fmt(void *arg,struct camera_data *cam, struct cpia2_fh *fh)
{
      struct v4l2_format *f = arg;
      int err, frame;

      err = ioctl_try_fmt(arg, cam);
      if(err != 0)
            return err;

      /* Ensure that only this process can change the format. */
      err = v4l2_prio_change(&cam->prio, &fh->prio, V4L2_PRIORITY_RECORD);
      if(err != 0) {
            return err;
      }

      cam->pixelformat = f->fmt.pix.pixelformat;

      /* NOTE: This should be set to 1 for MJPEG, but some apps don't handle
       * the missing Huffman table properly. */
      cam->params.compression.inhibit_htables = 0;
            /*f->fmt.pix.pixelformat == V4L2_PIX_FMT_MJPEG;*/

      /* we set the video window to something smaller or equal to what
       * is requested by the user???
       */
      DBG("Requested width = %d, height = %d\n",
          f->fmt.pix.width, f->fmt.pix.height);
      if (f->fmt.pix.width != cam->vw.width ||
          f->fmt.pix.height != cam->vw.height) {
            cam->vw.width = f->fmt.pix.width;
            cam->vw.height = f->fmt.pix.height;
            cam->params.roi.width = f->fmt.pix.width;
            cam->params.roi.height = f->fmt.pix.height;
            cpia2_set_format(cam);
      }

      for (frame = 0; frame < cam->num_frames; ++frame) {
            if (cam->buffers[frame].status == FRAME_READING)
                  if ((err = sync(cam, frame)) < 0)
                        return err;

            cam->buffers[frame].status = FRAME_EMPTY;
      }

      return 0;
}

/******************************************************************************
 *
 *  ioctl_get_fmt
 *
 *  V4L2 format get
 *
 *****************************************************************************/

static int ioctl_get_fmt(void *arg,struct camera_data *cam)
{
      struct v4l2_format *f = arg;

      if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
             return -EINVAL;

      f->fmt.pix.width = cam->vw.width;
      f->fmt.pix.height = cam->vw.height;
      f->fmt.pix.pixelformat = cam->pixelformat;
      f->fmt.pix.field = V4L2_FIELD_NONE;
      f->fmt.pix.bytesperline = 0;
      f->fmt.pix.sizeimage = cam->frame_size;
      f->fmt.pix.colorspace = V4L2_COLORSPACE_JPEG;
      f->fmt.pix.priv = 0;

      return 0;
}

/******************************************************************************
 *
 *  ioctl_cropcap
 *
 *  V4L2 query cropping capabilities
 *  NOTE: cropping is currently disabled
 *
 *****************************************************************************/

static int ioctl_cropcap(void *arg,struct camera_data *cam)
{
      struct v4l2_cropcap *c = arg;

      if (c->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
             return -EINVAL;

      c->bounds.left = 0;
      c->bounds.top = 0;
      c->bounds.width = cam->vw.width;
      c->bounds.height = cam->vw.height;
      c->defrect.left = 0;
      c->defrect.top = 0;
      c->defrect.width = cam->vw.width;
      c->defrect.height = cam->vw.height;
      c->pixelaspect.numerator = 1;
      c->pixelaspect.denominator = 1;

      return 0;
}

/******************************************************************************
 *
 *  ioctl_queryctrl
 *
 *  V4L2 query possible control variables
 *
 *****************************************************************************/

static int ioctl_queryctrl(void *arg,struct camera_data *cam)
{
      struct v4l2_queryctrl *c = arg;
      int i;

      for(i=0; i<NUM_CONTROLS; ++i) {
            if(c->id == controls[i].id) {
                  memcpy(c, controls+i, sizeof(*c));
                  break;
            }
      }

      if(i == NUM_CONTROLS)
            return -EINVAL;

      /* Some devices have additional limitations */
      switch(c->id) {
      case V4L2_CID_BRIGHTNESS:
            /***
             * Don't let the register be set to zero - bug in VP4
             * flash of full brightness
             ***/
            if (cam->params.pnp_id.device_type == DEVICE_STV_672)
                  c->minimum = 1;
            break;
      case V4L2_CID_VFLIP:
            // VP5 Only
            if(cam->params.pnp_id.device_type == DEVICE_STV_672)
                  c->flags |= V4L2_CTRL_FLAG_DISABLED;
            break;
      case CPIA2_CID_FRAMERATE:
            if(cam->params.pnp_id.device_type == DEVICE_STV_672 &&
               cam->params.version.sensor_flags==CPIA2_VP_SENSOR_FLAGS_500){
                  // Maximum 15fps
                  int i;
                  for(i=0; i<c->maximum; ++i) {
                        if(framerate_controls[i].value ==
                           CPIA2_VP_FRAMERATE_15) {
                              c->maximum = i;
                              c->default_value = i;
                        }
                  }
            }
            break;
      case CPIA2_CID_FLICKER_MODE:
            // Flicker control only valid for 672.
            if(cam->params.pnp_id.device_type != DEVICE_STV_672)
                  c->flags |= V4L2_CTRL_FLAG_DISABLED;
            break;
      case CPIA2_CID_LIGHTS:
            // Light control only valid for the QX5 Microscope.
            if(cam->params.pnp_id.product != 0x151)
                  c->flags |= V4L2_CTRL_FLAG_DISABLED;
            break;
      default:
            break;
      }

      return 0;
}

/******************************************************************************
 *
 *  ioctl_querymenu
 *
 *  V4L2 query possible control variables
 *
 *****************************************************************************/

static int ioctl_querymenu(void *arg,struct camera_data *cam)
{
      struct v4l2_querymenu *m = arg;

      memset(m->name, 0, sizeof(m->name));
      m->reserved = 0;

      switch(m->id) {
      case CPIA2_CID_FLICKER_MODE:
            if(m->index < 0 || m->index >= NUM_FLICKER_CONTROLS)
                  return -EINVAL;

            strcpy(m->name, flicker_controls[m->index].name);
            break;
      case CPIA2_CID_FRAMERATE:
          {
            int maximum = NUM_FRAMERATE_CONTROLS - 1;
            if(cam->params.pnp_id.device_type == DEVICE_STV_672 &&
               cam->params.version.sensor_flags==CPIA2_VP_SENSOR_FLAGS_500){
                  // Maximum 15fps
                  int i;
                  for(i=0; i<maximum; ++i) {
                        if(framerate_controls[i].value ==
                           CPIA2_VP_FRAMERATE_15)
                              maximum = i;
                  }
            }
            if(m->index < 0 || m->index > maximum)
                  return -EINVAL;

            strcpy(m->name, framerate_controls[m->index].name);
            break;
          }
      case CPIA2_CID_LIGHTS:
            if(m->index < 0 || m->index >= NUM_LIGHTS_CONTROLS)
                  return -EINVAL;

            strcpy(m->name, lights_controls[m->index].name);
            break;
      default:
            return -EINVAL;
      }

      return 0;
}

/******************************************************************************
 *
 *  ioctl_g_ctrl
 *
 *  V4L2 get the value of a control variable
 *
 *****************************************************************************/

static int ioctl_g_ctrl(void *arg,struct camera_data *cam)
{
      struct v4l2_control *c = arg;

      switch(c->id) {
      case V4L2_CID_BRIGHTNESS:
            cpia2_do_command(cam, CPIA2_CMD_GET_VP_BRIGHTNESS,
                         TRANSFER_READ, 0);
            c->value = cam->params.color_params.brightness;
            break;
      case V4L2_CID_CONTRAST:
            cpia2_do_command(cam, CPIA2_CMD_GET_CONTRAST,
                         TRANSFER_READ, 0);
            c->value = cam->params.color_params.contrast;
            break;
      case V4L2_CID_SATURATION:
            cpia2_do_command(cam, CPIA2_CMD_GET_VP_SATURATION,
                         TRANSFER_READ, 0);
            c->value = cam->params.color_params.saturation;
            break;
      case V4L2_CID_HFLIP:
            cpia2_do_command(cam, CPIA2_CMD_GET_USER_EFFECTS,
                         TRANSFER_READ, 0);
            c->value = (cam->params.vp_params.user_effects &
                      CPIA2_VP_USER_EFFECTS_MIRROR) != 0;
            break;
      case V4L2_CID_VFLIP:
            cpia2_do_command(cam, CPIA2_CMD_GET_USER_EFFECTS,
                         TRANSFER_READ, 0);
            c->value = (cam->params.vp_params.user_effects &
                      CPIA2_VP_USER_EFFECTS_FLIP) != 0;
            break;
      case CPIA2_CID_TARGET_KB:
            c->value = cam->params.vc_params.target_kb;
            break;
      case CPIA2_CID_GPIO:
            cpia2_do_command(cam, CPIA2_CMD_GET_VP_GPIO_DATA,
                         TRANSFER_READ, 0);
            c->value = cam->params.vp_params.gpio_data;
            break;
      case CPIA2_CID_FLICKER_MODE:
      {
            int i, mode;
            cpia2_do_command(cam, CPIA2_CMD_GET_FLICKER_MODES,
                         TRANSFER_READ, 0);
            if(cam->params.flicker_control.cam_register &
               CPIA2_VP_FLICKER_MODES_NEVER_FLICKER) {
                  mode = NEVER_FLICKER;
            } else {
                if(cam->params.flicker_control.cam_register &
                   CPIA2_VP_FLICKER_MODES_50HZ) {
                  mode = FLICKER_50;
                } else {
                  mode = FLICKER_60;
                }
            }
            for(i=0; i<NUM_FLICKER_CONTROLS; i++) {
                  if(flicker_controls[i].value == mode) {
                        c->value = i;
                        break;
                  }
            }
            if(i == NUM_FLICKER_CONTROLS)
                  return -EINVAL;
            break;
      }
      case CPIA2_CID_FRAMERATE:
      {
            int maximum = NUM_FRAMERATE_CONTROLS - 1;
            int i;
            for(i=0; i<= maximum; i++) {
                  if(cam->params.vp_params.frame_rate ==
                     framerate_controls[i].value)
                        break;
            }
            if(i > maximum)
                  return -EINVAL;
            c->value = i;
            break;
      }
      case CPIA2_CID_USB_ALT:
            c->value = cam->params.camera_state.stream_mode;
            break;
      case CPIA2_CID_LIGHTS:
      {
            int i;
            cpia2_do_command(cam, CPIA2_CMD_GET_VP_GPIO_DATA,
                         TRANSFER_READ, 0);
            for(i=0; i<NUM_LIGHTS_CONTROLS; i++) {
                  if((cam->params.vp_params.gpio_data&GPIO_LIGHTS_MASK) ==
                     lights_controls[i].value) {
                        break;
                  }
            }
            if(i == NUM_LIGHTS_CONTROLS)
                  return -EINVAL;
            c->value = i;
            break;
      }
      case CPIA2_CID_RESET_CAMERA:
            return -EINVAL;
      default:
            return -EINVAL;
      }

      DBG("Get control id:%d, value:%d\n", c->id, c->value);

      return 0;
}

/******************************************************************************
 *
 *  ioctl_s_ctrl
 *
 *  V4L2 set the value of a control variable
 *
 *****************************************************************************/

static int ioctl_s_ctrl(void *arg,struct camera_data *cam)
{
      struct v4l2_control *c = arg;
      int i;
      int retval = 0;

      DBG("Set control id:%d, value:%d\n", c->id, c->value);

      /* Check that the value is in range */
      for(i=0; i<NUM_CONTROLS; i++) {
            if(c->id == controls[i].id) {
                  if(c->value < controls[i].minimum ||
                     c->value > controls[i].maximum) {
                        return -EINVAL;
                  }
                  break;
            }
      }
      if(i == NUM_CONTROLS)
            return -EINVAL;

      switch(c->id) {
      case V4L2_CID_BRIGHTNESS:
            cpia2_set_brightness(cam, c->value);
            break;
      case V4L2_CID_CONTRAST:
            cpia2_set_contrast(cam, c->value);
            break;
      case V4L2_CID_SATURATION:
            cpia2_set_saturation(cam, c->value);
            break;
      case V4L2_CID_HFLIP:
            cpia2_set_property_mirror(cam, c->value);
            break;
      case V4L2_CID_VFLIP:
            cpia2_set_property_flip(cam, c->value);
            break;
      case CPIA2_CID_TARGET_KB:
            retval = cpia2_set_target_kb(cam, c->value);
            break;
      case CPIA2_CID_GPIO:
            retval = cpia2_set_gpio(cam, c->value);
            break;
      case CPIA2_CID_FLICKER_MODE:
            retval = cpia2_set_flicker_mode(cam,
                                    flicker_controls[c->value].value);
            break;
      case CPIA2_CID_FRAMERATE:
            retval = cpia2_set_fps(cam, framerate_controls[c->value].value);
            break;
      case CPIA2_CID_USB_ALT:
            retval = cpia2_usb_change_streaming_alternate(cam, c->value);
            break;
      case CPIA2_CID_LIGHTS:
            retval = cpia2_set_gpio(cam, lights_controls[c->value].value);
            break;
      case CPIA2_CID_RESET_CAMERA:
            cpia2_usb_stream_pause(cam);
            cpia2_reset_camera(cam);
            cpia2_usb_stream_resume(cam);
            break;
      default:
            retval = -EINVAL;
      }

      return retval;
}

/******************************************************************************
 *
 *  ioctl_g_jpegcomp
 *
 *  V4L2 get the JPEG compression parameters
 *
 *****************************************************************************/

static int ioctl_g_jpegcomp(void *arg,struct camera_data *cam)
{
      struct v4l2_jpegcompression *parms = arg;

      memset(parms, 0, sizeof(*parms));

      parms->quality = 80; // TODO: Can this be made meaningful?

      parms->jpeg_markers = V4L2_JPEG_MARKER_DQT | V4L2_JPEG_MARKER_DRI;
      if(!cam->params.compression.inhibit_htables) {
            parms->jpeg_markers |= V4L2_JPEG_MARKER_DHT;
      }

      parms->APPn = cam->APPn;
      parms->APP_len = cam->APP_len;
      if(cam->APP_len > 0) {
            memcpy(parms->APP_data, cam->APP_data, cam->APP_len);
            parms->jpeg_markers |= V4L2_JPEG_MARKER_APP;
      }

      parms->COM_len = cam->COM_len;
      if(cam->COM_len > 0) {
            memcpy(parms->COM_data, cam->COM_data, cam->COM_len);
            parms->jpeg_markers |= JPEG_MARKER_COM;
      }

      DBG("G_JPEGCOMP APP_len:%d COM_len:%d\n",
          parms->APP_len, parms->COM_len);

      return 0;
}

/******************************************************************************
 *
 *  ioctl_s_jpegcomp
 *
 *  V4L2 set the JPEG compression parameters
 *  NOTE: quality and some jpeg_markers are ignored.
 *
 *****************************************************************************/

static int ioctl_s_jpegcomp(void *arg,struct camera_data *cam)
{
      struct v4l2_jpegcompression *parms = arg;

      DBG("S_JPEGCOMP APP_len:%d COM_len:%d\n",
          parms->APP_len, parms->COM_len);

      cam->params.compression.inhibit_htables =
            !(parms->jpeg_markers & V4L2_JPEG_MARKER_DHT);

      if(parms->APP_len != 0) {
            if(parms->APP_len > 0 &&
               parms->APP_len <= sizeof(cam->APP_data) &&
               parms->APPn >= 0 && parms->APPn <= 15) {
                  cam->APPn = parms->APPn;
                  cam->APP_len = parms->APP_len;
                  memcpy(cam->APP_data, parms->APP_data, parms->APP_len);
            } else {
                  LOG("Bad APPn Params n=%d len=%d\n",
                      parms->APPn, parms->APP_len);
                  return -EINVAL;
            }
      } else {
            cam->APP_len = 0;
      }

      if(parms->COM_len != 0) {
            if(parms->COM_len > 0 &&
               parms->COM_len <= sizeof(cam->COM_data)) {
                  cam->COM_len = parms->COM_len;
                  memcpy(cam->COM_data, parms->COM_data, parms->COM_len);
            } else {
                  LOG("Bad COM_len=%d\n", parms->COM_len);
                  return -EINVAL;
            }
      }

      return 0;
}

/******************************************************************************
 *
 *  ioctl_reqbufs
 *
 *  V4L2 Initiate memory mapping.
 *  NOTE: The user's request is ignored. For now the buffers are fixed.
 *
 *****************************************************************************/

static int ioctl_reqbufs(void *arg,struct camera_data *cam)
{
      struct v4l2_requestbuffers *req = arg;

      if(req->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
         req->memory != V4L2_MEMORY_MMAP)
            return -EINVAL;

      DBG("REQBUFS requested:%d returning:%d\n", req->count, cam->num_frames);
      req->count = cam->num_frames;
      memset(&req->reserved, 0, sizeof(req->reserved));

      return 0;
}

/******************************************************************************
 *
 *  ioctl_querybuf
 *
 *  V4L2 Query memory buffer status.
 *
 *****************************************************************************/

static int ioctl_querybuf(void *arg,struct camera_data *cam)
{
      struct v4l2_buffer *buf = arg;

      if(buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
         buf->index > cam->num_frames)
            return -EINVAL;

      buf->m.offset = cam->buffers[buf->index].data - cam->frame_buffer;
      buf->length = cam->frame_size;

      buf->memory = V4L2_MEMORY_MMAP;

      if(cam->mmapped)
            buf->flags = V4L2_BUF_FLAG_MAPPED;
      else
            buf->flags = 0;

      switch (cam->buffers[buf->index].status) {
      case FRAME_EMPTY:
      case FRAME_ERROR:
      case FRAME_READING:
            buf->bytesused = 0;
            buf->flags = V4L2_BUF_FLAG_QUEUED;
            break;
      case FRAME_READY:
            buf->bytesused = cam->buffers[buf->index].length;
            buf->timestamp = cam->buffers[buf->index].timestamp;
            buf->sequence = cam->buffers[buf->index].seq;
            buf->flags = V4L2_BUF_FLAG_DONE;
            break;
      }

      DBG("QUERYBUF index:%d offset:%d flags:%d seq:%d bytesused:%d\n",
           buf->index, buf->m.offset, buf->flags, buf->sequence,
           buf->bytesused);

      return 0;
}

/******************************************************************************
 *
 *  ioctl_qbuf
 *
 *  V4L2 User is freeing buffer
 *
 *****************************************************************************/

static int ioctl_qbuf(void *arg,struct camera_data *cam)
{
      struct v4l2_buffer *buf = arg;

      if(buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
         buf->memory != V4L2_MEMORY_MMAP ||
         buf->index > cam->num_frames)
            return -EINVAL;

      DBG("QBUF #%d\n", buf->index);

      if(cam->buffers[buf->index].status == FRAME_READY)
            cam->buffers[buf->index].status = FRAME_EMPTY;

      return 0;
}

/******************************************************************************
 *
 *  find_earliest_filled_buffer
 *
 *  Helper for ioctl_dqbuf. Find the next ready buffer.
 *
 *****************************************************************************/

static int find_earliest_filled_buffer(struct camera_data *cam)
{
      int i;
      int found = -1;
      for (i=0; i<cam->num_frames; i++) {
            if(cam->buffers[i].status == FRAME_READY) {
                  if(found < 0) {
                        found = i;
                  } else {
                        /* find which buffer is earlier */
                        struct timeval *tv1, *tv2;
                        tv1 = &cam->buffers[i].timestamp;
                        tv2 = &cam->buffers[found].timestamp;
                        if(tv1->tv_sec < tv2->tv_sec ||
                           (tv1->tv_sec == tv2->tv_sec &&
                            tv1->tv_usec < tv2->tv_usec))
                              found = i;
                  }
            }
      }
      return found;
}

/******************************************************************************
 *
 *  ioctl_dqbuf
 *
 *  V4L2 User is asking for a filled buffer.
 *
 *****************************************************************************/

static int ioctl_dqbuf(void *arg,struct camera_data *cam, struct file *file)
{
      struct v4l2_buffer *buf = arg;
      int frame;

      if(buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
         buf->memory != V4L2_MEMORY_MMAP)
            return -EINVAL;

      frame = find_earliest_filled_buffer(cam);

      if(frame < 0 && file->f_flags&O_NONBLOCK)
            return -EAGAIN;

      if(frame < 0) {
            /* Wait for a frame to become available */
            struct framebuf *cb=cam->curbuff;
            mutex_unlock(&cam->busy_lock);
            wait_event_interruptible(cam->wq_stream,
                               !cam->present ||
                               (cb=cam->curbuff)->status == FRAME_READY);
            mutex_lock(&cam->busy_lock);
            if (signal_pending(current))
                  return -ERESTARTSYS;
            if(!cam->present)
                  return -ENOTTY;
            frame = cb->num;
      }


      buf->index = frame;
      buf->bytesused = cam->buffers[buf->index].length;
      buf->flags = V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_DONE;
      buf->field = V4L2_FIELD_NONE;
      buf->timestamp = cam->buffers[buf->index].timestamp;
      buf->sequence = cam->buffers[buf->index].seq;
      buf->m.offset = cam->buffers[buf->index].data - cam->frame_buffer;
      buf->length = cam->frame_size;
      buf->input = 0;
      buf->reserved = 0;
      memset(&buf->timecode, 0, sizeof(buf->timecode));

      DBG("DQBUF #%d status:%d seq:%d length:%d\n", buf->index,
          cam->buffers[buf->index].status, buf->sequence, buf->bytesused);

      return 0;
}

/******************************************************************************
 *
 *  cpia2_ioctl
 *
 *****************************************************************************/
static int cpia2_do_ioctl(struct inode *inode, struct file *file,
                    unsigned int ioctl_nr, void *arg)
{
      struct video_device *dev = video_devdata(file);
      struct camera_data *cam = video_get_drvdata(dev);
      int retval = 0;

      if (!cam)
            return -ENOTTY;

      /* make this _really_ smp-safe */
      if (mutex_lock_interruptible(&cam->busy_lock))
            return -ERESTARTSYS;

      if (!cam->present) {
            mutex_unlock(&cam->busy_lock);
            return -ENODEV;
      }

      /* Priority check */
      switch (ioctl_nr) {
      case VIDIOCSWIN:
      case VIDIOCMCAPTURE:
      case VIDIOC_S_FMT:
      {
            struct cpia2_fh *fh = file->private_data;
            retval = v4l2_prio_check(&cam->prio, &fh->prio);
            if(retval) {
                  mutex_unlock(&cam->busy_lock);
                  return retval;
            }
            break;
      }
      case VIDIOCGMBUF:
      case VIDIOCSYNC:
      {
            struct cpia2_fh *fh = file->private_data;
            if(fh->prio != V4L2_PRIORITY_RECORD) {
                  mutex_unlock(&cam->busy_lock);
                  return -EBUSY;
            }
            break;
      }
      default:
            break;
      }

      switch (ioctl_nr) {
      case VIDIOCGCAP:  /* query capabilities */
            retval = ioctl_cap_query(arg, cam);
            break;

      case VIDIOCGCHAN: /* get video source - we are a camera, nothing else */
            retval = ioctl_get_channel(arg);
            break;
      case VIDIOCSCHAN: /* set video source - we are a camera, nothing else */
            retval = ioctl_set_channel(arg);
            break;
      case VIDIOCGPICT: /* image properties */
            memcpy(arg, &cam->vp, sizeof(struct video_picture));
            break;
      case VIDIOCSPICT:
            retval = ioctl_set_image_prop(arg, cam);
            break;
      case VIDIOCGWIN:  /* get/set capture window */
            memcpy(arg, &cam->vw, sizeof(struct video_window));
            break;
      case VIDIOCSWIN:
            retval = ioctl_set_window_size(arg, cam, file->private_data);
            break;
      case VIDIOCGMBUF: /* mmap interface */
            retval = ioctl_get_mbuf(arg, cam);
            break;
      case VIDIOCMCAPTURE:
            retval = ioctl_mcapture(arg, cam, file->private_data);
            break;
      case VIDIOCSYNC:
            retval = ioctl_sync(arg, cam);
            break;
            /* pointless to implement overlay with this camera */
      case VIDIOCCAPTURE:
      case VIDIOCGFBUF:
      case VIDIOCSFBUF:
      case VIDIOCKEY:
            retval = -EINVAL;
            break;

            /* tuner interface - we have none */
      case VIDIOCGTUNER:
      case VIDIOCSTUNER:
      case VIDIOCGFREQ:
      case VIDIOCSFREQ:
            retval = -EINVAL;
            break;

            /* audio interface - we have none */
      case VIDIOCGAUDIO:
      case VIDIOCSAUDIO:
            retval = -EINVAL;
            break;

      /* CPIA2 extension to Video4Linux API */
      case CPIA2_IOC_SET_GPIO:
            retval = ioctl_set_gpio(arg, cam);
            break;
      case VIDIOC_QUERYCAP:
            retval = ioctl_querycap(arg,cam);
            break;

      case VIDIOC_ENUMINPUT:
      case VIDIOC_G_INPUT:
      case VIDIOC_S_INPUT:
            retval = ioctl_input(ioctl_nr, arg,cam);
            break;

      case VIDIOC_ENUM_FMT:
            retval = ioctl_enum_fmt(arg,cam);
            break;
      case VIDIOC_TRY_FMT:
            retval = ioctl_try_fmt(arg,cam);
            break;
      case VIDIOC_G_FMT:
            retval = ioctl_get_fmt(arg,cam);
            break;
      case VIDIOC_S_FMT:
            retval = ioctl_set_fmt(arg,cam,file->private_data);
            break;

      case VIDIOC_CROPCAP:
            retval = ioctl_cropcap(arg,cam);
            break;
      case VIDIOC_G_CROP:
      case VIDIOC_S_CROP:
            // TODO: I think cropping can be implemented - SJB
            retval = -EINVAL;
            break;

      case VIDIOC_QUERYCTRL:
            retval = ioctl_queryctrl(arg,cam);
            break;
      case VIDIOC_QUERYMENU:
            retval = ioctl_querymenu(arg,cam);
            break;
      case VIDIOC_G_CTRL:
            retval = ioctl_g_ctrl(arg,cam);
            break;
      case VIDIOC_S_CTRL:
            retval = ioctl_s_ctrl(arg,cam);
            break;

      case VIDIOC_G_JPEGCOMP:
            retval = ioctl_g_jpegcomp(arg,cam);
            break;
      case VIDIOC_S_JPEGCOMP:
            retval = ioctl_s_jpegcomp(arg,cam);
            break;

      case VIDIOC_G_PRIORITY:
      {
            struct cpia2_fh *fh = file->private_data;
            *(enum v4l2_priority*)arg = fh->prio;
            break;
      }
      case VIDIOC_S_PRIORITY:
      {
            struct cpia2_fh *fh = file->private_data;
            enum v4l2_priority prio;
            prio = *(enum v4l2_priority*)arg;
            if(cam->streaming &&
               prio != fh->prio &&
               fh->prio == V4L2_PRIORITY_RECORD) {
                  /* Can't drop record priority while streaming */
                  retval = -EBUSY;
            } else if(prio == V4L2_PRIORITY_RECORD &&
               prio != fh->prio &&
               v4l2_prio_max(&cam->prio) == V4L2_PRIORITY_RECORD) {
                  /* Only one program can record at a time */
                  retval = -EBUSY;
            } else {
                  retval = v4l2_prio_change(&cam->prio, &fh->prio, prio);
            }
            break;
      }

      case VIDIOC_REQBUFS:
            retval = ioctl_reqbufs(arg,cam);
            break;
      case VIDIOC_QUERYBUF:
            retval = ioctl_querybuf(arg,cam);
            break;
      case VIDIOC_QBUF:
            retval = ioctl_qbuf(arg,cam);
            break;
      case VIDIOC_DQBUF:
            retval = ioctl_dqbuf(arg,cam,file);
            break;
      case VIDIOC_STREAMON:
      {
            int type;
            DBG("VIDIOC_STREAMON, streaming=%d\n", cam->streaming);
            type = *(int*)arg;
            if(!cam->mmapped || type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
                  retval = -EINVAL;

            if(!cam->streaming) {
                  retval = cpia2_usb_stream_start(cam,
                                cam->params.camera_state.stream_mode);
            } else {
                  retval = -EINVAL;
            }

            break;
      }
      case VIDIOC_STREAMOFF:
      {
            int type;
            DBG("VIDIOC_STREAMOFF, streaming=%d\n", cam->streaming);
            type = *(int*)arg;
            if(!cam->mmapped || type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
                  retval = -EINVAL;

            if(cam->streaming) {
                  retval = cpia2_usb_stream_stop(cam);
            } else {
                  retval = -EINVAL;
            }

            break;
      }

      case VIDIOC_ENUMOUTPUT:
      case VIDIOC_G_OUTPUT:
      case VIDIOC_S_OUTPUT:
      case VIDIOC_G_MODULATOR:
      case VIDIOC_S_MODULATOR:

      case VIDIOC_ENUMAUDIO:
      case VIDIOC_G_AUDIO:
      case VIDIOC_S_AUDIO:

      case VIDIOC_ENUMAUDOUT:
      case VIDIOC_G_AUDOUT:
      case VIDIOC_S_AUDOUT:

      case VIDIOC_ENUMSTD:
      case VIDIOC_QUERYSTD:
      case VIDIOC_G_STD:
      case VIDIOC_S_STD:

      case VIDIOC_G_TUNER:
      case VIDIOC_S_TUNER:
      case VIDIOC_G_FREQUENCY:
      case VIDIOC_S_FREQUENCY:

      case VIDIOC_OVERLAY:
      case VIDIOC_G_FBUF:
      case VIDIOC_S_FBUF:

      case VIDIOC_G_PARM:
      case VIDIOC_S_PARM:
            retval = -EINVAL;
            break;
      default:
            retval = -ENOIOCTLCMD;
            break;
      }

      mutex_unlock(&cam->busy_lock);
      return retval;
}

static int cpia2_ioctl(struct inode *inode, struct file *file,
                   unsigned int ioctl_nr, unsigned long iarg)
{
      return video_usercopy(inode, file, ioctl_nr, iarg, cpia2_do_ioctl);
}

/******************************************************************************
 *
 *  cpia2_mmap
 *
 *****************************************************************************/
static int cpia2_mmap(struct file *file, struct vm_area_struct *area)
{
      int retval;
      struct video_device *dev = video_devdata(file);
      struct camera_data *cam = video_get_drvdata(dev);

      /* Priority check */
      struct cpia2_fh *fh = file->private_data;
      if(fh->prio != V4L2_PRIORITY_RECORD) {
            return -EBUSY;
      }

      retval = cpia2_remap_buffer(cam, area);

      if(!retval)
            fh->mmapped = 1;
      return retval;
}

/******************************************************************************
 *
 *  reset_camera_struct_v4l
 *
 *  Sets all values to the defaults
 *****************************************************************************/
static void reset_camera_struct_v4l(struct camera_data *cam)
{
      /***
       * Fill in the v4l structures.  video_cap is filled in inside the VIDIOCCAP
       * Ioctl.  Here, just do the window and picture stucts.
       ***/
      cam->vp.palette = (u16) VIDEO_PALETTE_RGB24;    /* Is this right? */
      cam->vp.brightness = (u16) cam->params.color_params.brightness * 256;
      cam->vp.colour = (u16) cam->params.color_params.saturation * 256;
      cam->vp.contrast = (u16) cam->params.color_params.contrast * 256;

      cam->vw.x = 0;
      cam->vw.y = 0;
      cam->vw.width = cam->params.roi.width;
      cam->vw.height = cam->params.roi.height;
      cam->vw.flags = 0;
      cam->vw.clipcount = 0;

      cam->frame_size = buffer_size;
      cam->num_frames = num_buffers;

      /* FlickerModes */
      cam->params.flicker_control.flicker_mode_req = flicker_mode;
      cam->params.flicker_control.mains_frequency = flicker_freq;

      /* streamMode */
      cam->params.camera_state.stream_mode = alternate;

      cam->pixelformat = V4L2_PIX_FMT_JPEG;
      v4l2_prio_init(&cam->prio);
      return;
}

/***
 * The v4l video device structure initialized for this device
 ***/
static const struct file_operations fops_template = {
      .owner            = THIS_MODULE,
      .open       = cpia2_open,
      .release    = cpia2_close,
      .read       = cpia2_v4l_read,
      .poll       = cpia2_v4l_poll,
      .ioctl            = cpia2_ioctl,
      .llseek           = no_llseek,
      .compat_ioctl     = v4l_compat_ioctl32,
      .mmap       = cpia2_mmap,
};

static struct video_device cpia2_template = {
      /* I could not find any place for the old .initialize initializer?? */
      .owner=           THIS_MODULE,
      .name=            "CPiA2 Camera",
      .type=            VID_TYPE_CAPTURE,
      .type2 =    V4L2_CAP_VIDEO_CAPTURE |
                  V4L2_CAP_STREAMING,
      .minor=           -1,
      .fops=            &fops_template,
      .release=   video_device_release,
};

/******************************************************************************
 *
 *  cpia2_register_camera
 *
 *****************************************************************************/
int cpia2_register_camera(struct camera_data *cam)
{
      cam->vdev = video_device_alloc();
      if(!cam->vdev)
            return -ENOMEM;

      memcpy(cam->vdev, &cpia2_template, sizeof(cpia2_template));
      video_set_drvdata(cam->vdev, cam);

      reset_camera_struct_v4l(cam);

      /* register v4l device */
      if (video_register_device
          (cam->vdev, VFL_TYPE_GRABBER, video_nr) == -1) {
            ERR("video_register_device failed\n");
            video_device_release(cam->vdev);
            return -ENODEV;
      }

      return 0;
}

/******************************************************************************
 *
 *  cpia2_unregister_camera
 *
 *****************************************************************************/
void cpia2_unregister_camera(struct camera_data *cam)
{
      if (!cam->open_count) {
            video_unregister_device(cam->vdev);
      } else {
            LOG("/dev/video%d removed while open, "
                "deferring video_unregister_device\n",
                cam->vdev->minor);
      }
}

/******************************************************************************
 *
 *  check_parameters
 *
 *  Make sure that all user-supplied parameters are sensible
 *****************************************************************************/
static void __init check_parameters(void)
{
      if(buffer_size < PAGE_SIZE) {
            buffer_size = PAGE_SIZE;
            LOG("buffer_size too small, setting to %d\n", buffer_size);
      } else if(buffer_size > 1024*1024) {
            /* arbitrary upper limiit */
            buffer_size = 1024*1024;
            LOG("buffer_size ridiculously large, setting to %d\n",
                buffer_size);
      } else {
            buffer_size += PAGE_SIZE-1;
            buffer_size &= ~(PAGE_SIZE-1);
      }

      if(num_buffers < 1) {
            num_buffers = 1;
            LOG("num_buffers too small, setting to %d\n", num_buffers);
      } else if(num_buffers > VIDEO_MAX_FRAME) {
            num_buffers = VIDEO_MAX_FRAME;
            LOG("num_buffers too large, setting to %d\n", num_buffers);
      }

      if(alternate < USBIF_ISO_1 || alternate > USBIF_ISO_6) {
            alternate = DEFAULT_ALT;
            LOG("alternate specified is invalid, using %d\n", alternate);
      }

      if (flicker_mode != NEVER_FLICKER && flicker_mode != ANTI_FLICKER_ON) {
            flicker_mode = NEVER_FLICKER;
            LOG("Flicker mode specified is invalid, using %d\n",
                flicker_mode);
      }

      if (flicker_freq != FLICKER_50 && flicker_freq != FLICKER_60) {
            flicker_freq = FLICKER_60;
            LOG("Flicker mode specified is invalid, using %d\n",
                flicker_freq);
      }

      if(video_nr < -1 || video_nr > 64) {
            video_nr = -1;
            LOG("invalid video_nr specified, must be -1 to 64\n");
      }

      DBG("Using %d buffers, each %d bytes, alternate=%d\n",
          num_buffers, buffer_size, alternate);
}

/************   Module Stuff ***************/


/******************************************************************************
 *
 * cpia2_init/module_init
 *
 *****************************************************************************/
static int __init cpia2_init(void)
{
      LOG("%s v%d.%d.%d\n",
          ABOUT, CPIA2_MAJ_VER, CPIA2_MIN_VER, CPIA2_PATCH_VER);
      check_parameters();
      cpia2_usb_init();
      return 0;
}


/******************************************************************************
 *
 * cpia2_exit/module_exit
 *
 *****************************************************************************/
static void __exit cpia2_exit(void)
{
      cpia2_usb_cleanup();
      schedule_timeout(2 * HZ);
}

module_init(cpia2_init);
module_exit(cpia2_exit);


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