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em28xx-video.c

/*
   em28xx-video.c - driver for Empia EM2800/EM2820/2840 USB video capture devices

   Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
                  Markus Rechberger <mrechberger@gmail.com>
                  Mauro Carvalho Chehab <mchehab@infradead.org>
                  Sascha Sommer <saschasommer@freenet.de>

      Some parts based on SN9C10x PC Camera Controllers GPL driver made
            by Luca Risolia <luca.risolia@studio.unibo.it>

   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.
 */

#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/bitmap.h>
#include <linux/usb.h>
#include <linux/i2c.h>
#include <linux/version.h>
#include <linux/mm.h>
#include <linux/video_decoder.h>
#include <linux/mutex.h>

#include "em28xx.h"
#include <media/tuner.h>
#include <media/v4l2-common.h>
#include <media/msp3400.h>

#define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
                  "Markus Rechberger <mrechberger@gmail.com>, " \
                  "Mauro Carvalho Chehab <mchehab@infradead.org>, " \
                  "Sascha Sommer <saschasommer@freenet.de>"

#define DRIVER_NAME         "em28xx"
#define DRIVER_DESC         "Empia em28xx based USB video device driver"
#define EM28XX_VERSION_CODE  KERNEL_VERSION(0, 0, 1)

#define em28xx_videodbg(fmt, arg...) do {\
      if (video_debug) \
            printk(KERN_INFO "%s %s :"fmt, \
                   dev->name, __FUNCTION__ , ##arg); } while (0)

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

static LIST_HEAD(em28xx_devlist);

static unsigned int card[]     = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
static unsigned int video_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
static unsigned int vbi_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
module_param_array(card,  int, NULL, 0444);
module_param_array(video_nr, int, NULL, 0444);
module_param_array(vbi_nr, int, NULL, 0444);
MODULE_PARM_DESC(card,"card type");
MODULE_PARM_DESC(video_nr,"video device numbers");
MODULE_PARM_DESC(vbi_nr,"vbi device numbers");

static int tuner = -1;
module_param(tuner, int, 0444);
MODULE_PARM_DESC(tuner, "tuner type");

static unsigned int video_debug = 0;
module_param(video_debug,int,0644);
MODULE_PARM_DESC(video_debug,"enable debug messages [video]");

/* Bitmask marking allocated devices from 0 to EM28XX_MAXBOARDS */
static unsigned long em28xx_devused;

/* supported tv norms */
static struct em28xx_tvnorm tvnorms[] = {
      {
            .name = "PAL",
            .id = V4L2_STD_PAL,
            .mode = VIDEO_MODE_PAL,
       }, {
            .name = "NTSC",
            .id = V4L2_STD_NTSC,
            .mode = VIDEO_MODE_NTSC,
      }, {
             .name = "SECAM",
             .id = V4L2_STD_SECAM,
             .mode = VIDEO_MODE_SECAM,
      }, {
            .name = "PAL-M",
            .id = V4L2_STD_PAL_M,
            .mode = VIDEO_MODE_PAL,
      }
};

#define TVNORMS ARRAY_SIZE(tvnorms)

/* supported controls */
/* Common to all boards */
static struct v4l2_queryctrl em28xx_qctrl[] = {
      {
            .id = V4L2_CID_AUDIO_VOLUME,
            .type = V4L2_CTRL_TYPE_INTEGER,
            .name = "Volume",
            .minimum = 0x0,
            .maximum = 0x1f,
            .step = 0x1,
            .default_value = 0x1f,
            .flags = 0,
      },{
            .id = V4L2_CID_AUDIO_MUTE,
            .type = V4L2_CTRL_TYPE_BOOLEAN,
            .name = "Mute",
            .minimum = 0,
            .maximum = 1,
            .step = 1,
            .default_value = 1,
            .flags = 0,
      }
};

static struct usb_driver em28xx_usb_driver;

static DEFINE_MUTEX(em28xx_sysfs_lock);
static DECLARE_RWSEM(em28xx_disconnect);

/*********************  v4l2 interface  ******************************************/

/*
 * em28xx_config()
 * inits registers with sane defaults
 */
static int em28xx_config(struct em28xx *dev)
{

      /* Sets I2C speed to 100 KHz */
      if (!dev->is_em2800)
            em28xx_write_regs_req(dev, 0x00, 0x06, "\x40", 1);

      /* enable vbi capturing */

/*    em28xx_write_regs_req(dev,0x00,0x0e,"\xC0",1); audio register */
/*    em28xx_write_regs_req(dev,0x00,0x0f,"\x80",1); clk register */
      em28xx_write_regs_req(dev,0x00,0x11,"\x51",1);

      em28xx_audio_usb_mute(dev, 1);
      dev->mute = 1;          /* maybe not the right place... */
      dev->volume = 0x1f;
      em28xx_audio_analog_set(dev);
      em28xx_audio_analog_setup(dev);
      em28xx_outfmt_set_yuv422(dev);
      em28xx_colorlevels_set_default(dev);
      em28xx_compression_disable(dev);

      return 0;
}

/*
 * em28xx_config_i2c()
 * configure i2c attached devices
 */
static void em28xx_config_i2c(struct em28xx *dev)
{
      struct v4l2_frequency f;
      struct v4l2_routing route;

      route.input = INPUT(dev->ctl_input)->vmux;
      route.output = 0;
      em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, NULL);
      em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
      em28xx_i2c_call_clients(dev, VIDIOC_STREAMON, NULL);

      /* configure tuner */
      f.tuner = 0;
      f.type = V4L2_TUNER_ANALOG_TV;
      f.frequency = 9076;     /* FIXME:remove magic number */
      dev->ctl_freq = f.frequency;
      em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, &f);

      /* configure tda9887 */


/*    em28xx_i2c_call_clients(dev,VIDIOC_S_STD,&dev->tvnorm->id); */
}

/*
 * em28xx_empty_framequeues()
 * prepare queues for incoming and outgoing frames
 */
static void em28xx_empty_framequeues(struct em28xx *dev)
{
      u32 i;

      INIT_LIST_HEAD(&dev->inqueue);
      INIT_LIST_HEAD(&dev->outqueue);

      for (i = 0; i < EM28XX_NUM_FRAMES; i++) {
            dev->frame[i].state = F_UNUSED;
            dev->frame[i].buf.bytesused = 0;
      }
}

static void video_mux(struct em28xx *dev, int index)
{
      int ainput;
      struct v4l2_routing route;

      route.input = INPUT(index)->vmux;
      route.output = 0;
      dev->ctl_input = index;
      dev->ctl_ainput = INPUT(index)->amux;

      em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);

      em28xx_videodbg("Setting input index=%d, vmux=%d, amux=%d\n",index,route.input,dev->ctl_ainput);

      if (dev->has_msp34xx) {
            if (dev->i2s_speed)
                  em28xx_i2c_call_clients(dev, VIDIOC_INT_I2S_CLOCK_FREQ, &dev->i2s_speed);
            route.input = dev->ctl_ainput;
            route.output = MSP_OUTPUT(MSP_SC_IN_DSP_SCART1);
            /* Note: this is msp3400 specific */
            em28xx_i2c_call_clients(dev, VIDIOC_INT_S_AUDIO_ROUTING, &route);
            ainput = EM28XX_AUDIO_SRC_TUNER;
            em28xx_audio_source(dev, ainput);
      } else {
            switch (dev->ctl_ainput) {
                  case 0:
                        ainput = EM28XX_AUDIO_SRC_TUNER;
                        break;
                  default:
                        ainput = EM28XX_AUDIO_SRC_LINE;
            }
            em28xx_audio_source(dev, ainput);
      }
}

/*
 * em28xx_v4l2_open()
 * inits the device and starts isoc transfer
 */
static int em28xx_v4l2_open(struct inode *inode, struct file *filp)
{
      int minor = iminor(inode);
      int errCode = 0;
      struct em28xx *h,*dev = NULL;

      list_for_each_entry(h, &em28xx_devlist, devlist) {
            if (h->vdev->minor == minor) {
                  dev  = h;
                  dev->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
            }
            if (h->vbi_dev->minor == minor) {
                  dev  = h;
                  dev->type = V4L2_BUF_TYPE_VBI_CAPTURE;
            }
      }
      if (NULL == dev)
            return -ENODEV;

      em28xx_videodbg("open minor=%d type=%s users=%d\n",
                        minor,v4l2_type_names[dev->type],dev->users);

      if (!down_read_trylock(&em28xx_disconnect))
            return -ERESTARTSYS;

      if (dev->users) {
            em28xx_warn("this driver can be opened only once\n");
            up_read(&em28xx_disconnect);
            return -EBUSY;
      }

      mutex_init(&dev->fileop_lock);      /* to 1 == available */
      spin_lock_init(&dev->queue_lock);
      init_waitqueue_head(&dev->wait_frame);
      init_waitqueue_head(&dev->wait_stream);

      mutex_lock(&dev->lock);

      if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
            em28xx_set_alternate(dev);

            dev->width = norm_maxw(dev);
            dev->height = norm_maxh(dev);
            dev->frame_size = dev->width * dev->height * 2;
            dev->field_size = dev->frame_size >> 1;   /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
            dev->bytesperline = dev->width * 2;
            dev->hscale = 0;
            dev->vscale = 0;

            em28xx_capture_start(dev, 1);
            em28xx_resolution_set(dev);

            /* device needs to be initialized before isoc transfer */
            video_mux(dev, 0);

            /* start the transfer */
            errCode = em28xx_init_isoc(dev);
            if (errCode)
                  goto err;

      }

      dev->users++;
      filp->private_data = dev;
      dev->io = IO_NONE;
      dev->stream = STREAM_OFF;
      dev->num_frames = 0;

      /* prepare queues */
      em28xx_empty_framequeues(dev);

      dev->state |= DEV_INITIALIZED;

err:
      mutex_unlock(&dev->lock);
      up_read(&em28xx_disconnect);
      return errCode;
}

/*
 * em28xx_realease_resources()
 * unregisters the v4l2,i2c and usb devices
 * called when the device gets disconected or at module unload
*/
static void em28xx_release_resources(struct em28xx *dev)
{
      mutex_lock(&em28xx_sysfs_lock);

      /*FIXME: I2C IR should be disconnected */

      em28xx_info("V4L2 devices /dev/video%d and /dev/vbi%d deregistered\n",
                        dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
                        dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
      list_del(&dev->devlist);
      video_unregister_device(dev->vdev);
      video_unregister_device(dev->vbi_dev);
      em28xx_i2c_unregister(dev);
      usb_put_dev(dev->udev);
      mutex_unlock(&em28xx_sysfs_lock);


      /* Mark device as unused */
      em28xx_devused&=~(1<<dev->devno);
}

/*
 * em28xx_v4l2_close()
 * stops streaming and deallocates all resources allocated by the v4l2 calls and ioctls
 */
static int em28xx_v4l2_close(struct inode *inode, struct file *filp)
{
      int errCode;
      struct em28xx *dev=filp->private_data;

      em28xx_videodbg("users=%d\n", dev->users);

      mutex_lock(&dev->lock);

      em28xx_uninit_isoc(dev);

      em28xx_release_buffers(dev);

      /* the device is already disconnect, free the remaining resources */
      if (dev->state & DEV_DISCONNECTED) {
            em28xx_release_resources(dev);
            mutex_unlock(&dev->lock);
            kfree(dev);
            return 0;
      }

      /* set alternate 0 */
      dev->alt = 0;
      em28xx_videodbg("setting alternate 0\n");
      errCode = usb_set_interface(dev->udev, 0, 0);
      if (errCode < 0) {
            em28xx_errdev ("cannot change alternate number to 0 (error=%i)\n",
                 errCode);
      }

      dev->users--;
      wake_up_interruptible_nr(&dev->open, 1);
      mutex_unlock(&dev->lock);
      return 0;
}

/*
 * em28xx_v4l2_read()
 * will allocate buffers when called for the first time
 */
static ssize_t
em28xx_v4l2_read(struct file *filp, char __user * buf, size_t count,
             loff_t * f_pos)
{
      struct em28xx_frame_t *f, *i;
      unsigned long lock_flags;
      int ret = 0;
      struct em28xx *dev = filp->private_data;

      if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
            em28xx_videodbg("V4l2_Buf_type_videocapture is set\n");
      }
      if (dev->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
            em28xx_videodbg("V4L2_BUF_TYPE_VBI_CAPTURE is set\n");
            em28xx_videodbg("not supported yet! ...\n");
            if (copy_to_user(buf, "", 1)) {
                  mutex_unlock(&dev->fileop_lock);
                  return -EFAULT;
            }
            return (1);
      }
      if (dev->type == V4L2_BUF_TYPE_SLICED_VBI_CAPTURE) {
            em28xx_videodbg("V4L2_BUF_TYPE_SLICED_VBI_CAPTURE is set\n");
            em28xx_videodbg("not supported yet! ...\n");
            if (copy_to_user(buf, "", 1)) {
                  mutex_unlock(&dev->fileop_lock);
                  return -EFAULT;
            }
            return (1);
      }

      if (mutex_lock_interruptible(&dev->fileop_lock))
            return -ERESTARTSYS;

      if (dev->state & DEV_DISCONNECTED) {
            em28xx_videodbg("device not present\n");
            mutex_unlock(&dev->fileop_lock);
            return -ENODEV;
      }

      if (dev->state & DEV_MISCONFIGURED) {
            em28xx_videodbg("device misconfigured; close and open it again\n");
            mutex_unlock(&dev->fileop_lock);
            return -EIO;
      }

      if (dev->io == IO_MMAP) {
            em28xx_videodbg ("IO method is set to mmap; close and open"
                        " the device again to choose the read method\n");
            mutex_unlock(&dev->fileop_lock);
            return -EINVAL;
      }

      if (dev->io == IO_NONE) {
            if (!em28xx_request_buffers(dev, EM28XX_NUM_READ_FRAMES)) {
                  em28xx_errdev("read failed, not enough memory\n");
                  mutex_unlock(&dev->fileop_lock);
                  return -ENOMEM;
            }
            dev->io = IO_READ;
            dev->stream = STREAM_ON;
            em28xx_queue_unusedframes(dev);
      }

      if (!count) {
            mutex_unlock(&dev->fileop_lock);
            return 0;
      }

      if (list_empty(&dev->outqueue)) {
            if (filp->f_flags & O_NONBLOCK) {
                  mutex_unlock(&dev->fileop_lock);
                  return -EAGAIN;
            }
            ret = wait_event_interruptible
                (dev->wait_frame,
                 (!list_empty(&dev->outqueue)) ||
                 (dev->state & DEV_DISCONNECTED));
            if (ret) {
                  mutex_unlock(&dev->fileop_lock);
                  return ret;
            }
            if (dev->state & DEV_DISCONNECTED) {
                  mutex_unlock(&dev->fileop_lock);
                  return -ENODEV;
            }
      }

      f = list_entry(dev->outqueue.prev, struct em28xx_frame_t, frame);

      spin_lock_irqsave(&dev->queue_lock, lock_flags);
      list_for_each_entry(i, &dev->outqueue, frame)
          i->state = F_UNUSED;
      INIT_LIST_HEAD(&dev->outqueue);
      spin_unlock_irqrestore(&dev->queue_lock, lock_flags);

      em28xx_queue_unusedframes(dev);

      if (count > f->buf.length)
            count = f->buf.length;

      if (copy_to_user(buf, f->bufmem, count)) {
            mutex_unlock(&dev->fileop_lock);
            return -EFAULT;
      }
      *f_pos += count;

      mutex_unlock(&dev->fileop_lock);

      return count;
}

/*
 * em28xx_v4l2_poll()
 * will allocate buffers when called for the first time
 */
static unsigned int em28xx_v4l2_poll(struct file *filp, poll_table * wait)
{
      unsigned int mask = 0;
      struct em28xx *dev = filp->private_data;

      if (mutex_lock_interruptible(&dev->fileop_lock))
            return POLLERR;

      if (dev->state & DEV_DISCONNECTED) {
            em28xx_videodbg("device not present\n");
      } else if (dev->state & DEV_MISCONFIGURED) {
            em28xx_videodbg("device is misconfigured; close and open it again\n");
      } else {
            if (dev->io == IO_NONE) {
                  if (!em28xx_request_buffers
                      (dev, EM28XX_NUM_READ_FRAMES)) {
                        em28xx_warn
                            ("poll() failed, not enough memory\n");
                  } else {
                        dev->io = IO_READ;
                        dev->stream = STREAM_ON;
                  }
            }

            if (dev->io == IO_READ) {
                  em28xx_queue_unusedframes(dev);
                  poll_wait(filp, &dev->wait_frame, wait);

                  if (!list_empty(&dev->outqueue))
                        mask |= POLLIN | POLLRDNORM;

                  mutex_unlock(&dev->fileop_lock);

                  return mask;
            }
      }

      mutex_unlock(&dev->fileop_lock);
      return POLLERR;
}

/*
 * em28xx_vm_open()
 */
static void em28xx_vm_open(struct vm_area_struct *vma)
{
      struct em28xx_frame_t *f = vma->vm_private_data;
      f->vma_use_count++;
}

/*
 * em28xx_vm_close()
 */
static void em28xx_vm_close(struct vm_area_struct *vma)
{
      /* NOTE: buffers are not freed here */
      struct em28xx_frame_t *f = vma->vm_private_data;

      if (f->vma_use_count)
            f->vma_use_count--;
}

static struct vm_operations_struct em28xx_vm_ops = {
      .open = em28xx_vm_open,
      .close = em28xx_vm_close,
};

/*
 * em28xx_v4l2_mmap()
 */
static int em28xx_v4l2_mmap(struct file *filp, struct vm_area_struct *vma)
{
      unsigned long size = vma->vm_end - vma->vm_start,
          start = vma->vm_start;
      void *pos;
      u32 i;

      struct em28xx *dev = filp->private_data;

      if (mutex_lock_interruptible(&dev->fileop_lock))
            return -ERESTARTSYS;

      if (dev->state & DEV_DISCONNECTED) {
            em28xx_videodbg("mmap: device not present\n");
            mutex_unlock(&dev->fileop_lock);
            return -ENODEV;
      }

      if (dev->state & DEV_MISCONFIGURED) {
            em28xx_videodbg ("mmap: Device is misconfigured; close and "
                                    "open it again\n");
            mutex_unlock(&dev->fileop_lock);
            return -EIO;
      }

      if (dev->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
          size != PAGE_ALIGN(dev->frame[0].buf.length)) {
            mutex_unlock(&dev->fileop_lock);
            return -EINVAL;
      }

      for (i = 0; i < dev->num_frames; i++) {
            if ((dev->frame[i].buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
                  break;
      }
      if (i == dev->num_frames) {
            em28xx_videodbg("mmap: user supplied mapping address is out of range\n");
            mutex_unlock(&dev->fileop_lock);
            return -EINVAL;
      }

      /* VM_IO is eventually going to replace PageReserved altogether */
      vma->vm_flags |= VM_IO;
      vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */

      pos = dev->frame[i].bufmem;
      while (size > 0) {      /* size is page-aligned */
            if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
                  em28xx_videodbg("mmap: vm_insert_page failed\n");
                  mutex_unlock(&dev->fileop_lock);
                  return -EAGAIN;
            }
            start += PAGE_SIZE;
            pos += PAGE_SIZE;
            size -= PAGE_SIZE;
      }

      vma->vm_ops = &em28xx_vm_ops;
      vma->vm_private_data = &dev->frame[i];

      em28xx_vm_open(vma);
      mutex_unlock(&dev->fileop_lock);
      return 0;
}

/*
 * em28xx_get_ctrl()
 * return the current saturation, brightness or contrast, mute state
 */
static int em28xx_get_ctrl(struct em28xx *dev, struct v4l2_control *ctrl)
{
      switch (ctrl->id) {
      case V4L2_CID_AUDIO_MUTE:
            ctrl->value = dev->mute;
            return 0;
      case V4L2_CID_AUDIO_VOLUME:
            ctrl->value = dev->volume;
            return 0;
      default:
            return -EINVAL;
      }
}

/*
 * em28xx_set_ctrl()
 * mute or set new saturation, brightness or contrast
 */
static int em28xx_set_ctrl(struct em28xx *dev, const struct v4l2_control *ctrl)
{
      switch (ctrl->id) {
      case V4L2_CID_AUDIO_MUTE:
            if (ctrl->value != dev->mute) {
                  dev->mute = ctrl->value;
                  em28xx_audio_usb_mute(dev, ctrl->value);
                  return em28xx_audio_analog_set(dev);
            }
            return 0;
      case V4L2_CID_AUDIO_VOLUME:
            dev->volume = ctrl->value;
            return em28xx_audio_analog_set(dev);
      default:
            return -EINVAL;
      }
}

/*
 * em28xx_stream_interrupt()
 * stops streaming
 */
static int em28xx_stream_interrupt(struct em28xx *dev)
{
      int ret = 0;

      /* stop reading from the device */

      dev->stream = STREAM_INTERRUPT;
      ret = wait_event_timeout(dev->wait_stream,
                         (dev->stream == STREAM_OFF) ||
                         (dev->state & DEV_DISCONNECTED),
                         EM28XX_URB_TIMEOUT);
      if (dev->state & DEV_DISCONNECTED)
            return -ENODEV;
      else if (ret) {
            dev->state |= DEV_MISCONFIGURED;
            em28xx_videodbg("device is misconfigured; close and "
                  "open /dev/video%d again\n",
                        dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
            return ret;
      }

      return 0;
}

static int em28xx_set_norm(struct em28xx *dev, int width, int height)
{
      unsigned int hscale, vscale;
      unsigned int maxh, maxw;

      maxw = norm_maxw(dev);
      maxh = norm_maxh(dev);

      /* width must even because of the YUYV format */
      /* height must be even because of interlacing */
      height &= 0xfffe;
      width &= 0xfffe;

      if (height < 32)
            height = 32;
      if (height > maxh)
            height = maxh;
      if (width < 48)
            width = 48;
      if (width > maxw)
            width = maxw;

      if ((hscale = (((unsigned long)maxw) << 12) / width - 4096L) >= 0x4000)
            hscale = 0x3fff;
      width = (((unsigned long)maxw) << 12) / (hscale + 4096L);

      if ((vscale = (((unsigned long)maxh) << 12) / height - 4096L) >= 0x4000)
            vscale = 0x3fff;
      height = (((unsigned long)maxh) << 12) / (vscale + 4096L);

      /* set new image size */
      dev->width = width;
      dev->height = height;
      dev->frame_size = dev->width * dev->height * 2;
      dev->field_size = dev->frame_size >> 1;   /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
      dev->bytesperline = dev->width * 2;
      dev->hscale = hscale;
      dev->vscale = vscale;

      em28xx_resolution_set(dev);

      return 0;
}

static int em28xx_get_fmt(struct em28xx *dev, struct v4l2_format *format)
{
      em28xx_videodbg("VIDIOC_G_FMT: type=%s\n",
            (format->type ==V4L2_BUF_TYPE_VIDEO_CAPTURE) ?
            "V4L2_BUF_TYPE_VIDEO_CAPTURE" :
            (format->type ==V4L2_BUF_TYPE_VBI_CAPTURE) ?
            "V4L2_BUF_TYPE_VBI_CAPTURE" :
            (format->type ==V4L2_CAP_SLICED_VBI_CAPTURE) ?
            "V4L2_BUF_TYPE_SLICED_VBI_CAPTURE " :
            "not supported");

      switch (format->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE:
      {
            format->fmt.pix.width = dev->width;
            format->fmt.pix.height = dev->height;
            format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
            format->fmt.pix.bytesperline = dev->bytesperline;
            format->fmt.pix.sizeimage = dev->frame_size;
            format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
            format->fmt.pix.field = dev->interlaced ? V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;   /* FIXME: TOP? NONE? BOTTOM? ALTENATE? */

            em28xx_videodbg("VIDIOC_G_FMT: %dx%d\n", dev->width,
                  dev->height);
            break;
      }

      case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
      {
            format->fmt.sliced.service_set=0;

            em28xx_i2c_call_clients(dev,VIDIOC_G_FMT,format);

            if (format->fmt.sliced.service_set==0)
                  return -EINVAL;

            break;
      }

      default:
            return -EINVAL;
      }
      return (0);
}

static int em28xx_set_fmt(struct em28xx *dev, unsigned int cmd, struct v4l2_format *format)
{
      u32 i;
      int ret = 0;
      int width = format->fmt.pix.width;
      int height = format->fmt.pix.height;
      unsigned int hscale, vscale;
      unsigned int maxh, maxw;

      maxw = norm_maxw(dev);
      maxh = norm_maxh(dev);

      em28xx_videodbg("%s: type=%s\n",
                  cmd == VIDIOC_TRY_FMT ?
                  "VIDIOC_TRY_FMT" : "VIDIOC_S_FMT",
                  format->type == V4L2_BUF_TYPE_VIDEO_CAPTURE ?
                  "V4L2_BUF_TYPE_VIDEO_CAPTURE" :
                  format->type == V4L2_BUF_TYPE_VBI_CAPTURE ?
                  "V4L2_BUF_TYPE_VBI_CAPTURE " :
                  "not supported");

      if (format->type == V4L2_BUF_TYPE_SLICED_VBI_CAPTURE) {
            em28xx_i2c_call_clients(dev,VIDIOC_G_FMT,format);

            if (format->fmt.sliced.service_set==0)
                  return -EINVAL;

            return 0;
      }


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

      em28xx_videodbg("%s: requested %dx%d\n",
            cmd == VIDIOC_TRY_FMT ?
            "VIDIOC_TRY_FMT" : "VIDIOC_S_FMT",
            format->fmt.pix.width, format->fmt.pix.height);

      /* FIXME: Move some code away from here */
      /* width must even because of the YUYV format */
      /* height must be even because of interlacing */
      height &= 0xfffe;
      width &= 0xfffe;

      if (height < 32)
            height = 32;
      if (height > maxh)
            height = maxh;
      if (width < 48)
            width = 48;
      if (width > maxw)
            width = maxw;

      if(dev->is_em2800){
            /* the em2800 can only scale down to 50% */
            if(height % (maxh / 2))
                  height=maxh;
            if(width % (maxw / 2))
                  width=maxw;
            /* according to empiatech support */
            /* the MaxPacketSize is to small to support */
            /* framesizes larger than 640x480 @ 30 fps */
            /* or 640x576 @ 25 fps. As this would cut */
            /* of a part of the image we prefer */
            /* 360x576 or 360x480 for now */
            if(width == maxw && height == maxh)
                  width /= 2;
      }

      if ((hscale = (((unsigned long)maxw) << 12) / width - 4096L) >= 0x4000)
            hscale = 0x3fff;

      width = (((unsigned long)maxw) << 12) / (hscale + 4096L);

      if ((vscale = (((unsigned long)maxh) << 12) / height - 4096L) >= 0x4000)
            vscale = 0x3fff;

      height = (((unsigned long)maxh) << 12) / (vscale + 4096L);

      format->fmt.pix.width = width;
      format->fmt.pix.height = height;
      format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
      format->fmt.pix.bytesperline = width * 2;
      format->fmt.pix.sizeimage = width * 2 * height;
      format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
      format->fmt.pix.field = V4L2_FIELD_INTERLACED;

      em28xx_videodbg("%s: returned %dx%d (%d, %d)\n",
            cmd == VIDIOC_TRY_FMT ?
            "VIDIOC_TRY_FMT" :"VIDIOC_S_FMT",
            format->fmt.pix.width, format->fmt.pix.height, hscale, vscale);

      if (cmd == VIDIOC_TRY_FMT)
            return 0;

      for (i = 0; i < dev->num_frames; i++)
            if (dev->frame[i].vma_use_count) {
                  em28xx_videodbg("VIDIOC_S_FMT failed. "
                        "Unmap the buffers first.\n");
                  return -EINVAL;
            }

      /* stop io in case it is already in progress */
      if (dev->stream == STREAM_ON) {
            em28xx_videodbg("VIDIOC_SET_FMT: interrupting stream\n");
            if ((ret = em28xx_stream_interrupt(dev)))
                  return ret;
      }

      em28xx_release_buffers(dev);
      dev->io = IO_NONE;

      /* set new image size */
      dev->width = width;
      dev->height = height;
      dev->frame_size = dev->width * dev->height * 2;
      dev->field_size = dev->frame_size >> 1;
      dev->bytesperline = dev->width * 2;
      dev->hscale = hscale;
      dev->vscale = vscale;
      em28xx_uninit_isoc(dev);
      em28xx_set_alternate(dev);
      em28xx_capture_start(dev, 1);
      em28xx_resolution_set(dev);
      em28xx_init_isoc(dev);

      return 0;
}

/*
 * em28xx_v4l2_do_ioctl()
 * This function is _not_ called directly, but from
 * em28xx_v4l2_ioctl. Userspace
 * copying is done already, arg is a kernel pointer.
 */
static int em28xx_do_ioctl(struct inode *inode, struct file *filp,
                     struct em28xx *dev, unsigned int cmd, void *arg,
                     v4l2_kioctl driver_ioctl)
{
      int ret;

      switch (cmd) {
            /* ---------- tv norms ---------- */
      case VIDIOC_ENUMSTD:
      {
            struct v4l2_standard *e = arg;
            unsigned int i;

            i = e->index;
            if (i >= TVNORMS)
                  return -EINVAL;
            ret = v4l2_video_std_construct(e, tvnorms[e->index].id,
                                    tvnorms[e->index].name);
            e->index = i;
            if (ret < 0)
                  return ret;
            return 0;
      }
      case VIDIOC_G_STD:
      {
            v4l2_std_id *id = arg;

            *id = dev->tvnorm->id;
            return 0;
      }
      case VIDIOC_S_STD:
      {
            v4l2_std_id *id = arg;
            unsigned int i;

            for (i = 0; i < TVNORMS; i++)
                  if (*id == tvnorms[i].id)
                        break;
            if (i == TVNORMS)
                  for (i = 0; i < TVNORMS; i++)
                        if (*id & tvnorms[i].id)
                              break;
            if (i == TVNORMS)
                  return -EINVAL;

            mutex_lock(&dev->lock);
            dev->tvnorm = &tvnorms[i];

            em28xx_set_norm(dev, dev->width, dev->height);

            em28xx_i2c_call_clients(dev, VIDIOC_S_STD,
                              &dev->tvnorm->id);

            mutex_unlock(&dev->lock);

            return 0;
      }

      /* ------ input switching ---------- */
      case VIDIOC_ENUMINPUT:
      {
            struct v4l2_input *i = arg;
            unsigned int n;
            static const char *iname[] = {
                  [EM28XX_VMUX_COMPOSITE1] = "Composite1",
                  [EM28XX_VMUX_COMPOSITE2] = "Composite2",
                  [EM28XX_VMUX_COMPOSITE3] = "Composite3",
                  [EM28XX_VMUX_COMPOSITE4] = "Composite4",
                  [EM28XX_VMUX_SVIDEO] = "S-Video",
                  [EM28XX_VMUX_TELEVISION] = "Television",
                  [EM28XX_VMUX_CABLE] = "Cable TV",
                  [EM28XX_VMUX_DVB] = "DVB",
                  [EM28XX_VMUX_DEBUG] = "for debug only",
            };

            n = i->index;
            if (n >= MAX_EM28XX_INPUT)
                  return -EINVAL;
            if (0 == INPUT(n)->type)
                  return -EINVAL;
            memset(i, 0, sizeof(*i));
            i->index = n;
            i->type = V4L2_INPUT_TYPE_CAMERA;
            strcpy(i->name, iname[INPUT(n)->type]);
            if ((EM28XX_VMUX_TELEVISION == INPUT(n)->type) ||
                  (EM28XX_VMUX_CABLE == INPUT(n)->type))
                  i->type = V4L2_INPUT_TYPE_TUNER;
            for (n = 0; n < ARRAY_SIZE(tvnorms); n++)
                  i->std |= tvnorms[n].id;
            return 0;
      }
      case VIDIOC_G_INPUT:
      {
            int *i = arg;
            *i = dev->ctl_input;

            return 0;
      }
      case VIDIOC_S_INPUT:
      {
            int *index = arg;

            if (*index >= MAX_EM28XX_INPUT)
                  return -EINVAL;
            if (0 == INPUT(*index)->type)
                  return -EINVAL;

            mutex_lock(&dev->lock);
            video_mux(dev, *index);
            mutex_unlock(&dev->lock);

            return 0;
      }
      case VIDIOC_G_AUDIO:
      {
            struct v4l2_audio *a = arg;
            unsigned int index = a->index;

            if (a->index > 1)
                  return -EINVAL;
            memset(a, 0, sizeof(*a));
            index = dev->ctl_ainput;

            if (index == 0) {
                  strcpy(a->name, "Television");
            } else {
                  strcpy(a->name, "Line In");
            }
            a->capability = V4L2_AUDCAP_STEREO;
            a->index = index;
            return 0;
      }
      case VIDIOC_S_AUDIO:
      {
            struct v4l2_audio *a = arg;

            if (a->index != dev->ctl_ainput)
                  return -EINVAL;

            return 0;
      }

      /* --- controls ---------------------------------------------- */
      case VIDIOC_QUERYCTRL:
      {
            struct v4l2_queryctrl *qc = arg;
            int i, id=qc->id;

            memset(qc,0,sizeof(*qc));
            qc->id=id;

            if (!dev->has_msp34xx) {
                  for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
                        if (qc->id && qc->id == em28xx_qctrl[i].id) {
                              memcpy(qc, &(em28xx_qctrl[i]),
                              sizeof(*qc));
                              return 0;
                        }
                  }
            }
            em28xx_i2c_call_clients(dev,cmd,qc);
            if (qc->type)
                  return 0;
            else
                  return -EINVAL;
      }
      case VIDIOC_G_CTRL:
      {
            struct v4l2_control *ctrl = arg;
            int retval=-EINVAL;

            if (!dev->has_msp34xx)
                  retval=em28xx_get_ctrl(dev, ctrl);
            if (retval==-EINVAL) {
                  em28xx_i2c_call_clients(dev,cmd,arg);
                  return 0;
            } else return retval;
      }
      case VIDIOC_S_CTRL:
      {
            struct v4l2_control *ctrl = arg;
            u8 i;

            if (!dev->has_msp34xx){
                  for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
                        if (ctrl->id == em28xx_qctrl[i].id) {
                              if (ctrl->value <
                              em28xx_qctrl[i].minimum
                              || ctrl->value >
                              em28xx_qctrl[i].maximum)
                                    return -ERANGE;
                              return em28xx_set_ctrl(dev, ctrl);
                        }
                  }
            }

            em28xx_i2c_call_clients(dev,cmd,arg);
            return 0;
      }
      /* --- tuner ioctls ------------------------------------------ */
      case VIDIOC_G_TUNER:
      {
            struct v4l2_tuner *t = arg;

            if (0 != t->index)
                  return -EINVAL;

            memset(t, 0, sizeof(*t));
            strcpy(t->name, "Tuner");
            mutex_lock(&dev->lock);
            /* let clients fill in the remainder of this struct */
            em28xx_i2c_call_clients(dev, cmd, t);
            mutex_unlock(&dev->lock);
            em28xx_videodbg("VIDIO_G_TUNER: signal=%x, afc=%x\n", t->signal,
                        t->afc);
            return 0;
      }
      case VIDIOC_S_TUNER:
      {
            struct v4l2_tuner *t = arg;

            if (0 != t->index)
                  return -EINVAL;
            mutex_lock(&dev->lock);
            /* let clients handle this */
            em28xx_i2c_call_clients(dev, cmd, t);
            mutex_unlock(&dev->lock);
            return 0;
      }
      case VIDIOC_G_FREQUENCY:
      {
            struct v4l2_frequency *f = arg;

            memset(f, 0, sizeof(*f));
            f->type = V4L2_TUNER_ANALOG_TV;
            f->frequency = dev->ctl_freq;

            return 0;
      }
      case VIDIOC_S_FREQUENCY:
      {
            struct v4l2_frequency *f = arg;

            if (0 != f->tuner)
                  return -EINVAL;

            if (V4L2_TUNER_ANALOG_TV != f->type)
                  return -EINVAL;

            mutex_lock(&dev->lock);
            dev->ctl_freq = f->frequency;
            em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, f);
            mutex_unlock(&dev->lock);
            return 0;
      }
      case VIDIOC_CROPCAP:
      {
            struct v4l2_cropcap *cc = arg;

            if (cc->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
                  return -EINVAL;
            cc->bounds.left = 0;
            cc->bounds.top = 0;
            cc->bounds.width = dev->width;
            cc->bounds.height = dev->height;
            cc->defrect = cc->bounds;
            cc->pixelaspect.numerator = 54;     /* 4:3 FIXME: remove magic numbers */
            cc->pixelaspect.denominator = 59;
            return 0;
      }
      case VIDIOC_STREAMON:
      {
            int *type = arg;

            if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE
                  || dev->io != IO_MMAP)
                  return -EINVAL;

            if (list_empty(&dev->inqueue))
                  return -EINVAL;

            dev->stream = STREAM_ON;      /* FIXME: Start video capture here? */

            em28xx_videodbg("VIDIOC_STREAMON: starting stream\n");

            return 0;
      }
      case VIDIOC_STREAMOFF:
      {
            int *type = arg;
            int ret;

            if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE
                  || dev->io != IO_MMAP)
                  return -EINVAL;

            if (dev->stream == STREAM_ON) {
                  em28xx_videodbg ("VIDIOC_STREAMOFF: interrupting stream\n");
                  if ((ret = em28xx_stream_interrupt(dev)))
                        return ret;
            }
            em28xx_empty_framequeues(dev);

            return 0;
      }
      default:
            return v4l_compat_translate_ioctl(inode, filp, cmd, arg,
                                      driver_ioctl);
      }
      return 0;
}

/*
 * em28xx_v4l2_do_ioctl()
 * This function is _not_ called directly, but from
 * em28xx_v4l2_ioctl. Userspace
 * copying is done already, arg is a kernel pointer.
 */
static int em28xx_video_do_ioctl(struct inode *inode, struct file *filp,
                         unsigned int cmd, void *arg)
{
      struct em28xx *dev = filp->private_data;

      if (!dev)
            return -ENODEV;

      if (video_debug > 1)
            v4l_print_ioctl(dev->name,cmd);

      switch (cmd) {

            /* --- capabilities ------------------------------------------ */
      case VIDIOC_QUERYCAP:
            {
            struct v4l2_capability *cap = arg;

            memset(cap, 0, sizeof(*cap));
            strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
            strlcpy(cap->card, em28xx_boards[dev->model].name,
                  sizeof(cap->card));
            strlcpy(cap->bus_info, dev->udev->dev.bus_id,
                  sizeof(cap->bus_info));
            cap->version = EM28XX_VERSION_CODE;
            cap->capabilities =
                        V4L2_CAP_SLICED_VBI_CAPTURE |
                        V4L2_CAP_VIDEO_CAPTURE |
                        V4L2_CAP_AUDIO |
                        V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
            if (dev->has_tuner)
                  cap->capabilities |= V4L2_CAP_TUNER;
            return 0;
      }
      /* --- capture ioctls ---------------------------------------- */
      case VIDIOC_ENUM_FMT:
      {
            struct v4l2_fmtdesc *fmtd = arg;

            if (fmtd->index != 0)
                  return -EINVAL;
            memset(fmtd, 0, sizeof(*fmtd));
            fmtd->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
            strcpy(fmtd->description, "Packed YUY2");
            fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
            memset(fmtd->reserved, 0, sizeof(fmtd->reserved));
            return 0;
      }
      case VIDIOC_G_FMT:
            return em28xx_get_fmt(dev, (struct v4l2_format *) arg);

      case VIDIOC_TRY_FMT:
      case VIDIOC_S_FMT:
            return em28xx_set_fmt(dev, cmd, (struct v4l2_format *)arg);

      case VIDIOC_REQBUFS:
      {
            struct v4l2_requestbuffers *rb = arg;
            u32 i;
            int ret;

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

            if (dev->io == IO_READ) {
                  em28xx_videodbg ("method is set to read;"
                        " close and open the device again to"
                        " choose the mmap I/O method\n");
                  return -EINVAL;
            }

            for (i = 0; i < dev->num_frames; i++)
                  if (dev->frame[i].vma_use_count) {
                        em28xx_videodbg ("VIDIOC_REQBUFS failed; previous buffers are still mapped\n");
                        return -EINVAL;
                  }

            if (dev->stream == STREAM_ON) {
                  em28xx_videodbg("VIDIOC_REQBUFS: interrupting stream\n");
                  if ((ret = em28xx_stream_interrupt(dev)))
                        return ret;
            }

            em28xx_empty_framequeues(dev);

            em28xx_release_buffers(dev);
            if (rb->count)
                  rb->count =
                        em28xx_request_buffers(dev, rb->count);

            dev->frame_current = NULL;

            em28xx_videodbg ("VIDIOC_REQBUFS: setting io method to mmap: num bufs %i\n",
                                    rb->count);
            dev->io = rb->count ? IO_MMAP : IO_NONE;
            return 0;
      }
      case VIDIOC_QUERYBUF:
      {
            struct v4l2_buffer *b = arg;

            if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
                  b->index >= dev->num_frames || dev->io != IO_MMAP)
                  return -EINVAL;

            memcpy(b, &dev->frame[b->index].buf, sizeof(*b));

            if (dev->frame[b->index].vma_use_count) {
                  b->flags |= V4L2_BUF_FLAG_MAPPED;
            }
            if (dev->frame[b->index].state == F_DONE)
                  b->flags |= V4L2_BUF_FLAG_DONE;
            else if (dev->frame[b->index].state != F_UNUSED)
                  b->flags |= V4L2_BUF_FLAG_QUEUED;
            return 0;
      }
      case VIDIOC_QBUF:
      {
            struct v4l2_buffer *b = arg;
            unsigned long lock_flags;

            if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
                  b->index >= dev->num_frames || dev->io != IO_MMAP) {
                  return -EINVAL;
            }

            if (dev->frame[b->index].state != F_UNUSED) {
                  return -EAGAIN;
            }
            dev->frame[b->index].state = F_QUEUED;

            /* add frame to fifo */
            spin_lock_irqsave(&dev->queue_lock, lock_flags);
            list_add_tail(&dev->frame[b->index].frame,
                        &dev->inqueue);
            spin_unlock_irqrestore(&dev->queue_lock, lock_flags);

            return 0;
      }
      case VIDIOC_DQBUF:
      {
            struct v4l2_buffer *b = arg;
            struct em28xx_frame_t *f;
            unsigned long lock_flags;
            int ret = 0;

            if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
                  || dev->io != IO_MMAP)
                  return -EINVAL;

            if (list_empty(&dev->outqueue)) {
                  if (dev->stream == STREAM_OFF)
                        return -EINVAL;
                  if (filp->f_flags & O_NONBLOCK)
                        return -EAGAIN;
                  ret = wait_event_interruptible
                        (dev->wait_frame,
                        (!list_empty(&dev->outqueue)) ||
                        (dev->state & DEV_DISCONNECTED));
                  if (ret)
                        return ret;
                  if (dev->state & DEV_DISCONNECTED)
                        return -ENODEV;
            }

            spin_lock_irqsave(&dev->queue_lock, lock_flags);
            f = list_entry(dev->outqueue.next,
                        struct em28xx_frame_t, frame);
            list_del(dev->outqueue.next);
            spin_unlock_irqrestore(&dev->queue_lock, lock_flags);

            f->state = F_UNUSED;
            memcpy(b, &f->buf, sizeof(*b));

            if (f->vma_use_count)
                  b->flags |= V4L2_BUF_FLAG_MAPPED;

            return 0;
      }
      default:
            return em28xx_do_ioctl(inode, filp, dev, cmd, arg,
                               em28xx_video_do_ioctl);
      }
      return 0;
}

/*
 * em28xx_v4l2_ioctl()
 * handle v4l2 ioctl the main action happens in em28xx_v4l2_do_ioctl()
 */
static int em28xx_v4l2_ioctl(struct inode *inode, struct file *filp,
                       unsigned int cmd, unsigned long arg)
{
      int ret = 0;
      struct em28xx *dev = filp->private_data;

      if (mutex_lock_interruptible(&dev->fileop_lock))
            return -ERESTARTSYS;

      if (dev->state & DEV_DISCONNECTED) {
            em28xx_errdev("v4l2 ioctl: device not present\n");
            mutex_unlock(&dev->fileop_lock);
            return -ENODEV;
      }

      if (dev->state & DEV_MISCONFIGURED) {
            em28xx_errdev
                ("v4l2 ioctl: device is misconfigured; close and open it again\n");
            mutex_unlock(&dev->fileop_lock);
            return -EIO;
      }

      ret = video_usercopy(inode, filp, cmd, arg, em28xx_video_do_ioctl);

      mutex_unlock(&dev->fileop_lock);

      return ret;
}

static const struct file_operations em28xx_v4l_fops = {
      .owner = THIS_MODULE,
      .open = em28xx_v4l2_open,
      .release = em28xx_v4l2_close,
      .ioctl = em28xx_v4l2_ioctl,
      .read = em28xx_v4l2_read,
      .poll = em28xx_v4l2_poll,
      .mmap = em28xx_v4l2_mmap,
      .llseek = no_llseek,
      .compat_ioctl   = v4l_compat_ioctl32,

};

/******************************** usb interface *****************************************/

/*
 * em28xx_init_dev()
 * allocates and inits the device structs, registers i2c bus and v4l device
 */
static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
                     int minor, int model)
{
      struct em28xx *dev = *devhandle;
      int retval = -ENOMEM;
      int errCode, i;
      unsigned int maxh, maxw;

      dev->udev = udev;
      dev->model = model;
      mutex_init(&dev->lock);
      init_waitqueue_head(&dev->open);

      dev->em28xx_write_regs = em28xx_write_regs;
      dev->em28xx_read_reg = em28xx_read_reg;
      dev->em28xx_read_reg_req_len = em28xx_read_reg_req_len;
      dev->em28xx_write_regs_req = em28xx_write_regs_req;
      dev->em28xx_read_reg_req = em28xx_read_reg_req;
      dev->is_em2800 = em28xx_boards[model].is_em2800;
      dev->has_tuner = em28xx_boards[model].has_tuner;
      dev->has_msp34xx = em28xx_boards[model].has_msp34xx;
      dev->tda9887_conf = em28xx_boards[model].tda9887_conf;
      dev->decoder = em28xx_boards[model].decoder;

      if (tuner >= 0)
            dev->tuner_type = tuner;
      else
            dev->tuner_type = em28xx_boards[model].tuner_type;

      dev->video_inputs = em28xx_boards[model].vchannels;

      for (i = 0; i < TVNORMS; i++)
            if (em28xx_boards[model].norm == tvnorms[i].mode)
                  break;
      if (i == TVNORMS)
            i = 0;

      dev->tvnorm = &tvnorms[i];    /* set default norm */

      em28xx_videodbg("tvnorm=%s\n", dev->tvnorm->name);

      maxw = norm_maxw(dev);
      maxh = norm_maxh(dev);

      /* set default image size */
      dev->width = maxw;
      dev->height = maxh;
      dev->interlaced = EM28XX_INTERLACED_DEFAULT;
      dev->field_size = dev->width * dev->height;
      dev->frame_size =
          dev->interlaced ? dev->field_size << 1 : dev->field_size;
      dev->bytesperline = dev->width * 2;
      dev->hscale = 0;
      dev->vscale = 0;
      dev->ctl_input = 2;

      /* setup video picture settings for saa7113h */
      memset(&dev->vpic, 0, sizeof(dev->vpic));
      dev->vpic.colour = 128 << 8;
      dev->vpic.hue = 128 << 8;
      dev->vpic.brightness = 128 << 8;
      dev->vpic.contrast = 192 << 8;
      dev->vpic.whiteness = 128 << 8;     /* This one isn't used */
      dev->vpic.depth = 16;
      dev->vpic.palette = VIDEO_PALETTE_YUV422;

      em28xx_pre_card_setup(dev);
#ifdef CONFIG_MODULES
      /* request some modules */
      if (dev->decoder == EM28XX_SAA7113 || dev->decoder == EM28XX_SAA7114)
            request_module("saa7115");
      if (dev->decoder == EM28XX_TVP5150)
            request_module("tvp5150");
      if (dev->has_tuner)
            request_module("tuner");
#endif
      errCode = em28xx_config(dev);
      if (errCode) {
            em28xx_errdev("error configuring device\n");
            em28xx_devused&=~(1<<dev->devno);
            kfree(dev);
            return -ENOMEM;
      }

      mutex_lock(&dev->lock);
      /* register i2c bus */
      em28xx_i2c_register(dev);

      /* Do board specific init and eeprom reading */
      em28xx_card_setup(dev);

      /* configure the device */
      em28xx_config_i2c(dev);

      mutex_unlock(&dev->lock);

      errCode = em28xx_config(dev);

#ifdef CONFIG_MODULES
      if (dev->has_msp34xx)
            request_module("msp3400");
#endif
      /* allocate and fill v4l2 device struct */
      dev->vdev = video_device_alloc();
      if (NULL == dev->vdev) {
            em28xx_errdev("cannot allocate video_device.\n");
            em28xx_devused&=~(1<<dev->devno);
            kfree(dev);
            return -ENOMEM;
      }

      dev->vbi_dev = video_device_alloc();
      if (NULL == dev->vbi_dev) {
            em28xx_errdev("cannot allocate video_device.\n");
            kfree(dev->vdev);
            em28xx_devused&=~(1<<dev->devno);
            kfree(dev);
            return -ENOMEM;
      }

      /* Fills VBI device info */
      dev->vbi_dev->type = VFL_TYPE_VBI;
      dev->vbi_dev->fops = &em28xx_v4l_fops;
      dev->vbi_dev->minor = -1;
      dev->vbi_dev->dev = &dev->udev->dev;
      dev->vbi_dev->release = video_device_release;
      snprintf(dev->vbi_dev->name, sizeof(dev->vbi_dev->name), "%s#%d %s",
                                           "em28xx",dev->devno,"vbi");

      /* Fills CAPTURE device info */
      dev->vdev->type = VID_TYPE_CAPTURE;
      if (dev->has_tuner)
            dev->vdev->type |= VID_TYPE_TUNER;
      dev->vdev->fops = &em28xx_v4l_fops;
      dev->vdev->minor = -1;
      dev->vdev->dev = &dev->udev->dev;
      dev->vdev->release = video_device_release;
      snprintf(dev->vdev->name, sizeof(dev->vbi_dev->name), "%s#%d %s",
                                           "em28xx",dev->devno,"video");

      list_add_tail(&dev->devlist,&em28xx_devlist);

      /* register v4l2 device */
      mutex_lock(&dev->lock);
      if ((retval = video_register_device(dev->vdev, VFL_TYPE_GRABBER,
                               video_nr[dev->devno]))) {
            em28xx_errdev("unable to register video device (error=%i).\n",
                        retval);
            mutex_unlock(&dev->lock);
            list_del(&dev->devlist);
            video_device_release(dev->vdev);
            em28xx_devused&=~(1<<dev->devno);
            kfree(dev);
            return -ENODEV;
      }

      if (video_register_device(dev->vbi_dev, VFL_TYPE_VBI,
                              vbi_nr[dev->devno]) < 0) {
            printk("unable to register vbi device\n");
            mutex_unlock(&dev->lock);
            list_del(&dev->devlist);
            video_device_release(dev->vbi_dev);
            video_device_release(dev->vdev);
            em28xx_devused&=~(1<<dev->devno);
            kfree(dev);
            return -ENODEV;
      } else {
            printk("registered VBI\n");
      }

      if (dev->has_msp34xx) {
            /* Send a reset to other chips via gpio */
            em28xx_write_regs_req(dev, 0x00, 0x08, "\xf7", 1);
            msleep(3);
            em28xx_write_regs_req(dev, 0x00, 0x08, "\xff", 1);
            msleep(3);

      }
      video_mux(dev, 0);

      mutex_unlock(&dev->lock);

      em28xx_info("V4L2 device registered as /dev/video%d and /dev/vbi%d\n",
                        dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
                        dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);

      return 0;
}

/*
 * em28xx_usb_probe()
 * checks for supported devices
 */
static int em28xx_usb_probe(struct usb_interface *interface,
                      const struct usb_device_id *id)
{
      const struct usb_endpoint_descriptor *endpoint;
      struct usb_device *udev;
      struct usb_interface *uif;
      struct em28xx *dev = NULL;
      int retval = -ENODEV;
      int model,i,nr,ifnum;

      udev = usb_get_dev(interface_to_usbdev(interface));
      ifnum = interface->altsetting[0].desc.bInterfaceNumber;

      /* Check to see next free device and mark as used */
      nr=find_first_zero_bit(&em28xx_devused,EM28XX_MAXBOARDS);
      em28xx_devused|=1<<nr;

      /* Don't register audio interfaces */
      if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
            em28xx_err(DRIVER_NAME " audio device (%04x:%04x): interface %i, class %i\n",
                        udev->descriptor.idVendor,udev->descriptor.idProduct,
                        ifnum,
                        interface->altsetting[0].desc.bInterfaceClass);

            em28xx_devused&=~(1<<nr);
            return -ENODEV;
      }

      em28xx_err(DRIVER_NAME " new video device (%04x:%04x): interface %i, class %i\n",
                  udev->descriptor.idVendor,udev->descriptor.idProduct,
                  ifnum,
                  interface->altsetting[0].desc.bInterfaceClass);

      endpoint = &interface->cur_altsetting->endpoint[1].desc;

      /* check if the device has the iso in endpoint at the correct place */
      if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
          USB_ENDPOINT_XFER_ISOC) {
            em28xx_err(DRIVER_NAME " probing error: endpoint is non-ISO endpoint!\n");
            em28xx_devused&=~(1<<nr);
            return -ENODEV;
      }
      if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) {
            em28xx_err(DRIVER_NAME " probing error: endpoint is ISO OUT endpoint!\n");
            em28xx_devused&=~(1<<nr);
            return -ENODEV;
      }

      model=id->driver_info;

      if (nr >= EM28XX_MAXBOARDS) {
            printk (DRIVER_NAME ": Supports only %i em28xx boards.\n",EM28XX_MAXBOARDS);
            em28xx_devused&=~(1<<nr);
            return -ENOMEM;
      }

      /* allocate memory for our device state and initialize it */
      dev = kzalloc(sizeof(*dev), GFP_KERNEL);
      if (dev == NULL) {
            em28xx_err(DRIVER_NAME ": out of memory!\n");
            em28xx_devused&=~(1<<nr);
            return -ENOMEM;
      }

      snprintf(dev->name, 29, "em28xx #%d", nr);
      dev->devno=nr;

      /* compute alternate max packet sizes */
      uif = udev->actconfig->interface[0];

      dev->num_alt=uif->num_altsetting;
      em28xx_info("Alternate settings: %i\n",dev->num_alt);
//    dev->alt_max_pkt_size = kmalloc(sizeof(*dev->alt_max_pkt_size)*
      dev->alt_max_pkt_size = kmalloc(32*
                                    dev->num_alt,GFP_KERNEL);
      if (dev->alt_max_pkt_size == NULL) {
            em28xx_errdev("out of memory!\n");
            em28xx_devused&=~(1<<nr);
            kfree(dev);
            return -ENOMEM;
      }

      for (i = 0; i < dev->num_alt ; i++) {
            u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[1].desc.
                                          wMaxPacketSize);
            dev->alt_max_pkt_size[i] =
                (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
            em28xx_info("Alternate setting %i, max size= %i\n",i,
                                          dev->alt_max_pkt_size[i]);
      }

      if ((card[nr]>=0)&&(card[nr]<em28xx_bcount))
            model=card[nr];

      if ((model==EM2800_BOARD_UNKNOWN)||(model==EM2820_BOARD_UNKNOWN)) {
            em28xx_errdev( "Your board has no eeprom inside it and thus can't\n"
                  "%s: be autodetected.  Please pass card=<n> insmod option to\n"
                  "%s: workaround that.  Redirect complaints to the vendor of\n"
                  "%s: the TV card. Generic type will be used."
                  "%s: Best regards,\n"
                  "%s:         -- tux\n",
                  dev->name,dev->name,dev->name,dev->name,dev->name);
            em28xx_errdev("%s: Here is a list of valid choices for the card=<n> insmod option:\n",
                  dev->name);
            for (i = 0; i < em28xx_bcount; i++) {
                  em28xx_errdev("    card=%d -> %s\n", i,
                                          em28xx_boards[i].name);
            }
      }

      /* allocate device struct */
      retval = em28xx_init_dev(&dev, udev, nr, model);
      if (retval)
            return retval;

      em28xx_info("Found %s\n", em28xx_boards[model].name);

      /* save our data pointer in this interface device */
      usb_set_intfdata(interface, dev);
      return 0;
}

/*
 * em28xx_usb_disconnect()
 * called when the device gets diconencted
 * video device will be unregistered on v4l2_close in case it is still open
 */
static void em28xx_usb_disconnect(struct usb_interface *interface)
{
      struct em28xx *dev = usb_get_intfdata(interface);
      usb_set_intfdata(interface, NULL);

      if (!dev)
            return;

      down_write(&em28xx_disconnect);

      mutex_lock(&dev->lock);

      em28xx_info("disconnecting %s\n", dev->vdev->name);

      wake_up_interruptible_all(&dev->open);

      if (dev->users) {
            em28xx_warn
                ("device /dev/video%d is open! Deregistration and memory "
                 "deallocation are deferred on close.\n",
                        dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);

            dev->state |= DEV_MISCONFIGURED;
            em28xx_uninit_isoc(dev);
            dev->state |= DEV_DISCONNECTED;
            wake_up_interruptible(&dev->wait_frame);
            wake_up_interruptible(&dev->wait_stream);
      } else {
            dev->state |= DEV_DISCONNECTED;
            em28xx_release_resources(dev);
      }

      mutex_unlock(&dev->lock);

      if (!dev->users) {
            kfree(dev->alt_max_pkt_size);
            kfree(dev);
      }

      up_write(&em28xx_disconnect);
}

static struct usb_driver em28xx_usb_driver = {
      .name = "em28xx",
      .probe = em28xx_usb_probe,
      .disconnect = em28xx_usb_disconnect,
      .id_table = em28xx_id_table,
};

static int __init em28xx_module_init(void)
{
      int result;

      printk(KERN_INFO DRIVER_NAME " v4l2 driver version %d.%d.%d loaded\n",
             (EM28XX_VERSION_CODE >> 16) & 0xff,
             (EM28XX_VERSION_CODE >> 8) & 0xff, EM28XX_VERSION_CODE & 0xff);
#ifdef SNAPSHOT
      printk(KERN_INFO DRIVER_NAME " snapshot date %04d-%02d-%02d\n",
             SNAPSHOT / 10000, (SNAPSHOT / 100) % 100, SNAPSHOT % 100);
#endif

      /* register this driver with the USB subsystem */
      result = usb_register(&em28xx_usb_driver);
      if (result)
            em28xx_err(DRIVER_NAME
                     " usb_register failed. Error number %d.\n", result);

      return result;
}

static void __exit em28xx_module_exit(void)
{
      /* deregister this driver with the USB subsystem */
      usb_deregister(&em28xx_usb_driver);
}

module_init(em28xx_module_init);
module_exit(em28xx_module_exit);

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