drivers/media/video/pwc/pwc-v4l.c

/* Linux driver for Philips webcam
   USB and Video4Linux interface part.
   (C) 1999-2004 Nemosoft Unv.
   (C) 2004-2006 Luc Saillard (luc@saillard.org)

   NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx
   driver and thus may have bugs that are not present in the original version.
   Please send bug reports and support requests to <luc@saillard.org>.
   The decompression routines have been implemented by reverse-engineering the
   Nemosoft binary pwcx module. Caveat emptor.

   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

#include <linux/errno.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/vmalloc.h>
#include <asm/io.h>

#include "pwc.h"

static struct v4l2_queryctrl pwc_controls[] = {
	{
	    .id      = V4L2_CID_BRIGHTNESS,
	    .type    = V4L2_CTRL_TYPE_INTEGER,
	    .name    = "Brightness",
	    .minimum = 0,
	    .maximum = 128,
	    .step    = 1,
	    .default_value = 64,
	},
	{
	    .id      = V4L2_CID_CONTRAST,
	    .type    = V4L2_CTRL_TYPE_INTEGER,
	    .name    = "Contrast",
	    .minimum = 0,
	    .maximum = 64,
	    .step    = 1,
	    .default_value = 0,
	},
	{
	    .id      = V4L2_CID_SATURATION,
	    .type    = V4L2_CTRL_TYPE_INTEGER,
	    .name    = "Saturation",
	    .minimum = -100,
	    .maximum = 100,
	    .step    = 1,
	    .default_value = 0,
	},
	{
	    .id      = V4L2_CID_GAMMA,
	    .type    = V4L2_CTRL_TYPE_INTEGER,
	    .name    = "Gamma",
	    .minimum = 0,
	    .maximum = 32,
	    .step    = 1,
	    .default_value = 0,
	},
	{
	    .id      = V4L2_CID_RED_BALANCE,
	    .type    = V4L2_CTRL_TYPE_INTEGER,
	    .name    = "Red Gain",
	    .minimum = 0,
	    .maximum = 256,
	    .step    = 1,
	    .default_value = 0,
	},
	{
	    .id      = V4L2_CID_BLUE_BALANCE,
	    .type    = V4L2_CTRL_TYPE_INTEGER,
	    .name    = "Blue Gain",
	    .minimum = 0,
	    .maximum = 256,
	    .step    = 1,
	    .default_value = 0,
	},
	{
	    .id      = V4L2_CID_AUTO_WHITE_BALANCE,
	    .type    = V4L2_CTRL_TYPE_BOOLEAN,
	    .name    = "Auto White Balance",
	    .minimum = 0,
	    .maximum = 1,
	    .step    = 1,
	    .default_value = 0,
	},
	{
	    .id      = V4L2_CID_EXPOSURE,
	    .type    = V4L2_CTRL_TYPE_INTEGER,
	    .name    = "Shutter Speed (Exposure)",
	    .minimum = 0,
	    .maximum = 256,
	    .step    = 1,
	    .default_value = 200,
	},
	{
	    .id      = V4L2_CID_AUTOGAIN,
	    .type    = V4L2_CTRL_TYPE_BOOLEAN,
	    .name    = "Auto Gain Enabled",
	    .minimum = 0,
	    .maximum = 1,
	    .step    = 1,
	    .default_value = 1,
	},
	{
	    .id      = V4L2_CID_GAIN,
	    .type    = V4L2_CTRL_TYPE_INTEGER,
	    .name    = "Gain Level",
	    .minimum = 0,
	    .maximum = 256,
	    .step    = 1,
	    .default_value = 0,
	},
	{
	    .id      = V4L2_CID_PRIVATE_SAVE_USER,
	    .type    = V4L2_CTRL_TYPE_BUTTON,
	    .name    = "Save User Settings",
	    .minimum = 0,
	    .maximum = 0,
	    .step    = 0,
	    .default_value = 0,
	},
	{
	    .id      = V4L2_CID_PRIVATE_RESTORE_USER,
	    .type    = V4L2_CTRL_TYPE_BUTTON,
	    .name    = "Restore User Settings",
	    .minimum = 0,
	    .maximum = 0,
	    .step    = 0,
	    .default_value = 0,
	},
	{
	    .id      = V4L2_CID_PRIVATE_RESTORE_FACTORY,
	    .type    = V4L2_CTRL_TYPE_BUTTON,
	    .name    = "Restore Factory Settings",
	    .minimum = 0,
	    .maximum = 0,
	    .step    = 0,
	    .default_value = 0,
	},
	{
	    .id      = V4L2_CID_PRIVATE_COLOUR_MODE,
	    .type    = V4L2_CTRL_TYPE_BOOLEAN,
	    .name    = "Colour mode",
	    .minimum = 0,
	    .maximum = 1,
	    .step    = 1,
	    .default_value = 0,
	},
	{
	    .id      = V4L2_CID_PRIVATE_AUTOCONTOUR,
	    .type    = V4L2_CTRL_TYPE_BOOLEAN,
	    .name    = "Auto contour",
	    .minimum = 0,
	    .maximum = 1,
	    .step    = 1,
	    .default_value = 0,
	},
	{
	    .id      = V4L2_CID_PRIVATE_CONTOUR,
	    .type    = V4L2_CTRL_TYPE_INTEGER,
	    .name    = "Contour",
	    .minimum = 0,
	    .maximum = 63,
	    .step    = 1,
	    .default_value = 0,
	},
	{
	    .id      = V4L2_CID_PRIVATE_BACKLIGHT,
	    .type    = V4L2_CTRL_TYPE_BOOLEAN,
	    .name    = "Backlight compensation",
	    .minimum = 0,
	    .maximum = 1,
	    .step    = 1,
	    .default_value = 0,
	},
	{
	  .id      = V4L2_CID_PRIVATE_FLICKERLESS,
	    .type    = V4L2_CTRL_TYPE_BOOLEAN,
	    .name    = "Flickerless",
	    .minimum = 0,
	    .maximum = 1,
	    .step    = 1,
	    .default_value = 0,
	},
	{
	    .id      = V4L2_CID_PRIVATE_NOISE_REDUCTION,
	    .type    = V4L2_CTRL_TYPE_INTEGER,
	    .name    = "Noise reduction",
	    .minimum = 0,
	    .maximum = 3,
	    .step    = 1,
	    .default_value = 0,
	},
};


static void pwc_vidioc_fill_fmt(const struct pwc_device *pdev, struct v4l2_format *f)
{
	memset(&f->fmt.pix, 0, sizeof(struct v4l2_pix_format));
	f->fmt.pix.width        = pdev->view.x;
	f->fmt.pix.height       = pdev->view.y;
	f->fmt.pix.field        = V4L2_FIELD_NONE;
	if (pdev->pixfmt == V4L2_PIX_FMT_YUV420) {
		f->fmt.pix.pixelformat  = V4L2_PIX_FMT_YUV420;
		f->fmt.pix.bytesperline = (f->fmt.pix.width * 3)/2;
		f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
	} else {
		/* vbandlength contains 4 lines ...  */
		f->fmt.pix.bytesperline = pdev->vbandlength/4;
		f->fmt.pix.sizeimage = pdev->frame_size + sizeof(struct pwc_raw_frame);
		if (DEVICE_USE_CODEC1(pdev->type))
			f->fmt.pix.pixelformat  = V4L2_PIX_FMT_PWC1;
		else
			f->fmt.pix.pixelformat  = V4L2_PIX_FMT_PWC2;
	}
	PWC_DEBUG_IOCTL("pwc_vidioc_fill_fmt() "
			"width=%d, height=%d, bytesperline=%d, sizeimage=%d, pixelformat=%c%c%c%c\n",
			f->fmt.pix.width,
			f->fmt.pix.height,
			f->fmt.pix.bytesperline,
			f->fmt.pix.sizeimage,
			(f->fmt.pix.pixelformat)&255,
			(f->fmt.pix.pixelformat>>8)&255,
			(f->fmt.pix.pixelformat>>16)&255,
			(f->fmt.pix.pixelformat>>24)&255);
}

/* ioctl(VIDIOC_TRY_FMT) */
static int pwc_vidioc_try_fmt(struct pwc_device *pdev, struct v4l2_format *f)
{
	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
		PWC_DEBUG_IOCTL("Bad video type must be V4L2_BUF_TYPE_VIDEO_CAPTURE\n");
		return -EINVAL;
	}

	switch (f->fmt.pix.pixelformat) {
		case V4L2_PIX_FMT_YUV420:
			break;
		case V4L2_PIX_FMT_PWC1:
			if (DEVICE_USE_CODEC23(pdev->type)) {
				PWC_DEBUG_IOCTL("codec1 is only supported for old pwc webcam\n");
				return -EINVAL;
			}
			break;
		case V4L2_PIX_FMT_PWC2:
			if (DEVICE_USE_CODEC1(pdev->type)) {
				PWC_DEBUG_IOCTL("codec23 is only supported for new pwc webcam\n");
				return -EINVAL;
			}
			break;
		default:
			PWC_DEBUG_IOCTL("Unsupported pixel format\n");
			return -EINVAL;

	}

	if (f->fmt.pix.width > pdev->view_max.x)
		f->fmt.pix.width = pdev->view_max.x;
	else if (f->fmt.pix.width < pdev->view_min.x)
		f->fmt.pix.width = pdev->view_min.x;

	if (f->fmt.pix.height > pdev->view_max.y)
		f->fmt.pix.height = pdev->view_max.y;
	else if (f->fmt.pix.height < pdev->view_min.y)
		f->fmt.pix.height = pdev->view_min.y;

	return 0;
}

/* ioctl(VIDIOC_SET_FMT) */
static int pwc_vidioc_set_fmt(struct pwc_device *pdev, struct v4l2_format *f)
{
	int ret, fps, snapshot, compression, pixelformat;

	ret = pwc_vidioc_try_fmt(pdev, f);
	if (ret<0)
		return ret;

	pixelformat = f->fmt.pix.pixelformat;
	compression = pdev->vcompression;
	snapshot = 0;
	fps = pdev->vframes;
	if (f->fmt.pix.priv) {
		compression = (f->fmt.pix.priv & PWC_QLT_MASK) >> PWC_QLT_SHIFT;
		snapshot = !!(f->fmt.pix.priv & PWC_FPS_SNAPSHOT);
		fps = (f->fmt.pix.priv & PWC_FPS_FRMASK) >> PWC_FPS_SHIFT;
		if (fps == 0)
			fps = pdev->vframes;
	}

	if (pixelformat != V4L2_PIX_FMT_YUV420 &&
	    pixelformat != V4L2_PIX_FMT_PWC1 &&
	    pixelformat != V4L2_PIX_FMT_PWC2)
		return -EINVAL;

	PWC_DEBUG_IOCTL("Try to change format to: width=%d height=%d fps=%d "
			"compression=%d snapshot=%d format=%c%c%c%c\n",
			f->fmt.pix.width, f->fmt.pix.height, fps,
			compression, snapshot,
			(pixelformat)&255,
			(pixelformat>>8)&255,
			(pixelformat>>16)&255,
			(pixelformat>>24)&255);

	ret = pwc_try_video_mode(pdev,
				 f->fmt.pix.width,
				 f->fmt.pix.height,
				 fps,
				 compression,
				 snapshot);

	PWC_DEBUG_IOCTL("pwc_try_video_mode(), return=%d\n", ret);

	if (ret)
		return ret;

	pdev->pixfmt = pixelformat;

	pwc_vidioc_fill_fmt(pdev, f);

	return 0;

}

long pwc_video_do_ioctl(struct file *file, unsigned int cmd, void *arg)
{
	struct video_device *vdev = video_devdata(file);
	struct pwc_device *pdev;
	DECLARE_WAITQUEUE(wait, current);

	if (vdev == NULL)
		return -EFAULT;
	pdev = video_get_drvdata(vdev);
	if (pdev == NULL)
		return -EFAULT;

#ifdef CONFIG_USB_PWC_DEBUG
	if (PWC_DEBUG_LEVEL_IOCTL & pwc_trace) {
		v4l_printk_ioctl(cmd);
		printk("\n");
	}
#endif


	switch (cmd) {
#ifdef CONFIG_VIDEO_V4L1_COMPAT
		/* mmap() functions */
		case VIDIOCGMBUF:
		{
			/* Tell the user program how much memory is needed for a mmap() */
			struct video_mbuf *vm = arg;
			int i;

			memset(vm, 0, sizeof(*vm));
			vm->size = pwc_mbufs * pdev->len_per_image;
			vm->frames = pwc_mbufs; /* double buffering should be enough for most applications */
			for (i = 0; i < pwc_mbufs; i++)
				vm->offsets[i] = i * pdev->len_per_image;
			break;
		}
#endif

		/* V4L2 Layer */
		case VIDIOC_QUERYCAP:
		{
		    struct v4l2_capability *cap = arg;

		    PWC_DEBUG_IOCTL("ioctl(VIDIOC_QUERYCAP) This application "\
				       "try to use the v4l2 layer\n");
		    strcpy(cap->driver,PWC_NAME);
		    strlcpy(cap->card, vdev->name, sizeof(cap->card));
		    usb_make_path(pdev->udev,cap->bus_info,sizeof(cap->bus_info));
		    cap->version = PWC_VERSION_CODE;
		    cap->capabilities =
			V4L2_CAP_VIDEO_CAPTURE	|
			V4L2_CAP_STREAMING	|
			V4L2_CAP_READWRITE;
		    return 0;
		}

		case VIDIOC_ENUMINPUT:
		{
		    struct v4l2_input *i = arg;

		    if ( i->index )	/* Only one INPUT is supported */
			  return -EINVAL;

		    memset(i, 0, sizeof(struct v4l2_input));
		    strcpy(i->name, "usb");
		    return 0;
		}

		case VIDIOC_G_INPUT:
		{
		    int *i = arg;
		    *i = 0;	/* Only one INPUT is supported */
		    return 0;
		}
		case VIDIOC_S_INPUT:
		{
			int *i = arg;

			if ( *i ) {	/* Only one INPUT is supported */
				PWC_DEBUG_IOCTL("Only one input source is"\
					" supported with this webcam.\n");
				return -EINVAL;
			}
			return 0;
		}

		/* TODO: */
		case VIDIOC_QUERYCTRL:
		{
			struct v4l2_queryctrl *c = arg;
			int i;

			PWC_DEBUG_IOCTL("ioctl(VIDIOC_QUERYCTRL) query id=%d\n", c->id);
			for (i=0; i<sizeof(pwc_controls)/sizeof(struct v4l2_queryctrl); i++) {
				if (pwc_controls[i].id == c->id) {
					PWC_DEBUG_IOCTL("ioctl(VIDIOC_QUERYCTRL) found\n");
					memcpy(c,&pwc_controls[i],sizeof(struct v4l2_queryctrl));
					return 0;
				}
			}
			PWC_DEBUG_IOCTL("ioctl(VIDIOC_QUERYCTRL) not found\n");

			return -EINVAL;
		}
		case VIDIOC_G_CTRL:
		{
			struct v4l2_control *c = arg;
			int ret;

			switch (c->id)
			{
				case V4L2_CID_BRIGHTNESS:
					c->value = pwc_get_brightness(pdev);
					if (c->value<0)
						return -EINVAL;
					return 0;
				case V4L2_CID_CONTRAST:
					c->value = pwc_get_contrast(pdev);
					if (c->value<0)
						return -EINVAL;
					return 0;
				case V4L2_CID_SATURATION:
					ret = pwc_get_saturation(pdev, &c->value);
					if (ret<0)
						return -EINVAL;
					return 0;
				case V4L2_CID_GAMMA:
					c->value = pwc_get_gamma(pdev);
					if (c->value<0)
						return -EINVAL;
					return 0;
				case V4L2_CID_RED_BALANCE:
					ret = pwc_get_red_gain(pdev, &c->value);
					if (ret<0)
						return -EINVAL;
					c->value >>= 8;
					return 0;
				case V4L2_CID_BLUE_BALANCE:
					ret = pwc_get_blue_gain(pdev, &c->value);
					if (ret<0)
						return -EINVAL;
					c->value >>= 8;
					return 0;
				case V4L2_CID_AUTO_WHITE_BALANCE:
					ret = pwc_get_awb(pdev);
					if (ret<0)
						return -EINVAL;
					c->value = (ret == PWC_WB_MANUAL)?0:1;
					return 0;
				case V4L2_CID_GAIN:
					ret = pwc_get_agc(pdev, &c->value);
					if (ret<0)
						return -EINVAL;
					c->value >>= 8;
					return 0;
				case V4L2_CID_AUTOGAIN:
					ret = pwc_get_agc(pdev, &c->value);
					if (ret<0)
						return -EINVAL;
					c->value = (c->value < 0)?1:0;
					return 0;
				case V4L2_CID_EXPOSURE:
					ret = pwc_get_shutter_speed(pdev, &c->value);
					if (ret<0)
						return -EINVAL;
					return 0;
				case V4L2_CID_PRIVATE_COLOUR_MODE:
					ret = pwc_get_colour_mode(pdev, &c->value);
					if (ret < 0)
						return -EINVAL;
					return 0;
				case V4L2_CID_PRIVATE_AUTOCONTOUR:
					ret = pwc_get_contour(pdev, &c->value);
					if (ret < 0)
						return -EINVAL;
					c->value=(c->value == -1?1:0);
					return 0;
				case V4L2_CID_PRIVATE_CONTOUR:
					ret = pwc_get_contour(pdev, &c->value);
					if (ret < 0)
						return -EINVAL;
					c->value >>= 10;
					return 0;
				case V4L2_CID_PRIVATE_BACKLIGHT:
					ret = pwc_get_backlight(pdev, &c->value);
					if (ret < 0)
						return -EINVAL;
					return 0;
				case V4L2_CID_PRIVATE_FLICKERLESS:
					ret = pwc_get_flicker(pdev, &c->value);
					if (ret < 0)
						return -EINVAL;
					c->value=(c->value?1:0);
					return 0;
				case V4L2_CID_PRIVATE_NOISE_REDUCTION:
					ret = pwc_get_dynamic_noise(pdev, &c->value);
					if (ret < 0)
						return -EINVAL;
					return 0;

				case V4L2_CID_PRIVATE_SAVE_USER:
				case V4L2_CID_PRIVATE_RESTORE_USER:
				case V4L2_CID_PRIVATE_RESTORE_FACTORY:
					return -EINVAL;
			}
			return -EINVAL;
		}
		case VIDIOC_S_CTRL:
		{
			struct v4l2_control *c = arg;
			int ret;

			switch (c->id)
			{
				case V4L2_CID_BRIGHTNESS:
					c->value <<= 9;
					ret = pwc_set_brightness(pdev, c->value);
					if (ret<0)
						return -EINVAL;
					return 0;
				case V4L2_CID_CONTRAST:
					c->value <<= 10;
					ret = pwc_set_contrast(pdev, c->value);
					if (ret<0)
						return -EINVAL;
					return 0;
				case V4L2_CID_SATURATION:
					ret = pwc_set_saturation(pdev, c->value);
					if (ret<0)
					  return -EINVAL;
					return 0;
				case V4L2_CID_GAMMA:
					c->value <<= 11;
					ret = pwc_set_gamma(pdev, c->value);
					if (ret<0)
						return -EINVAL;
					return 0;
				case V4L2_CID_RED_BALANCE:
					c->value <<= 8;
					ret = pwc_set_red_gain(pdev, c->value);
					if (ret<0)
						return -EINVAL;
					return 0;
				case V4L2_CID_BLUE_BALANCE:
					c->value <<= 8;
					ret = pwc_set_blue_gain(pdev, c->value);
					if (ret<0)
						return -EINVAL;
					return 0;
				case V4L2_CID_AUTO_WHITE_BALANCE:
					c->value = (c->value == 0)?PWC_WB_MANUAL:PWC_WB_AUTO;
					ret = pwc_set_awb(pdev, c->value);
					if (ret<0)
						return -EINVAL;
					return 0;
				case V4L2_CID_EXPOSURE:
					c->value <<= 8;
					ret = pwc_set_shutter_speed(pdev, c->value?0:1, c->value);
					if (ret<0)
						return -EINVAL;
					return 0;
				case V4L2_CID_AUTOGAIN:
					/* autogain off means nothing without a gain */
					if (c->value == 0)
						return 0;
					ret = pwc_set_agc(pdev, c->value, 0);
					if (ret<0)
						return -EINVAL;
					return 0;
				case V4L2_CID_GAIN:
					c->value <<= 8;
					ret = pwc_set_agc(pdev, 0, c->value);
					if (ret<0)
						return -EINVAL;
					return 0;
				case V4L2_CID_PRIVATE_SAVE_USER:
					if (pwc_save_user(pdev))
						return -EINVAL;
					return 0;
				case V4L2_CID_PRIVATE_RESTORE_USER:
					if (pwc_restore_user(pdev))
						return -EINVAL;
					return 0;
				case V4L2_CID_PRIVATE_RESTORE_FACTORY:
					if (pwc_restore_factory(pdev))
						return -EINVAL;
					return 0;
				case V4L2_CID_PRIVATE_COLOUR_MODE:
					ret = pwc_set_colour_mode(pdev, c->value);
					if (ret < 0)
					  return -EINVAL;
					return 0;
				case V4L2_CID_PRIVATE_AUTOCONTOUR:
				  c->value=(c->value == 1)?-1:0;
				  ret = pwc_set_contour(pdev, c->value);
				  if (ret < 0)
				    return -EINVAL;
				  return 0;
				case V4L2_CID_PRIVATE_CONTOUR:
				  c->value <<= 10;
				  ret = pwc_set_contour(pdev, c->value);
				  if (ret < 0)
				    return -EINVAL;
				  return 0;
				case V4L2_CID_PRIVATE_BACKLIGHT:
				  ret = pwc_set_backlight(pdev, c->value);
				  if (ret < 0)
				    return -EINVAL;
				  return 0;
				case V4L2_CID_PRIVATE_FLICKERLESS:
				  ret = pwc_set_flicker(pdev, c->value);
				  if (ret < 0)
				    return -EINVAL;
				case V4L2_CID_PRIVATE_NOISE_REDUCTION:
				  ret = pwc_set_dynamic_noise(pdev, c->value);
				  if (ret < 0)
				    return -EINVAL;
				  return 0;

			}
			return -EINVAL;
		}

		case VIDIOC_ENUM_FMT:
		{
			struct v4l2_fmtdesc *f = arg;
			int index;

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

			/* We only support two format: the raw format, and YUV */
			index = f->index;
			memset(f,0,sizeof(struct v4l2_fmtdesc));
			f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
			f->index = index;
			switch(index)
			{
				case 0:
					/* RAW format */
					f->pixelformat = pdev->type<=646?V4L2_PIX_FMT_PWC1:V4L2_PIX_FMT_PWC2;
					f->flags = V4L2_FMT_FLAG_COMPRESSED;
					strlcpy(f->description,"Raw Philips Webcam",sizeof(f->description));
					break;
				case 1:
					f->pixelformat = V4L2_PIX_FMT_YUV420;
					strlcpy(f->description,"4:2:0, planar, Y-Cb-Cr",sizeof(f->description));
					break;
				default:
					return -EINVAL;
			}
			return 0;
		}

		case VIDIOC_G_FMT:
		{
			struct v4l2_format *f = arg;

			PWC_DEBUG_IOCTL("ioctl(VIDIOC_G_FMT) return size %dx%d\n",pdev->image.x,pdev->image.y);
			if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
			      return -EINVAL;

			pwc_vidioc_fill_fmt(pdev, f);

			return 0;
		}

		case VIDIOC_TRY_FMT:
			return pwc_vidioc_try_fmt(pdev, arg);

		case VIDIOC_S_FMT:
			return pwc_vidioc_set_fmt(pdev, arg);

		case VIDIOC_G_STD:
		{
			v4l2_std_id *std = arg;
			*std = V4L2_STD_UNKNOWN;
			return 0;
		}

		case VIDIOC_S_STD:
		{
			v4l2_std_id *std = arg;
			if (*std != V4L2_STD_UNKNOWN)
				return -EINVAL;
			return 0;
		}

		case VIDIOC_ENUMSTD:
		{
			struct v4l2_standard *std = arg;
			if (std->index != 0)
				return -EINVAL;
			std->id = V4L2_STD_UNKNOWN;
			strlcpy(std->name, "webcam", sizeof(std->name));
			return 0;
		}

		case VIDIOC_REQBUFS:
		{
			struct v4l2_requestbuffers *rb = arg;
			int nbuffers;

			PWC_DEBUG_IOCTL("ioctl(VIDIOC_REQBUFS) count=%d\n",rb->count);
			if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
				return -EINVAL;
			if (rb->memory != V4L2_MEMORY_MMAP)
				return -EINVAL;

			nbuffers = rb->count;
			if (nbuffers < 2)
				nbuffers = 2;
			else if (nbuffers > pwc_mbufs)
				nbuffers = pwc_mbufs;
			/* Force to use our # of buffers */
			rb->count = pwc_mbufs;
			return 0;
		}

		case VIDIOC_QUERYBUF:
		{
			struct v4l2_buffer *buf = arg;
			int index;

			PWC_DEBUG_IOCTL("ioctl(VIDIOC_QUERYBUF) index=%d\n",buf->index);
			if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
				PWC_DEBUG_IOCTL("ioctl(VIDIOC_QUERYBUF) Bad type\n");
				return -EINVAL;
			}
			if (buf->memory != V4L2_MEMORY_MMAP) {
				PWC_DEBUG_IOCTL("ioctl(VIDIOC_QUERYBUF) Bad memory type\n");
				return -EINVAL;
			}
			index = buf->index;
			if (index < 0 || index >= pwc_mbufs) {
				PWC_DEBUG_IOCTL("ioctl(VIDIOC_QUERYBUF) Bad index %d\n", buf->index);
				return -EINVAL;
			}

			memset(buf, 0, sizeof(struct v4l2_buffer));
			buf->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
			buf->index = index;
			buf->m.offset = index * pdev->len_per_image;
			if (pdev->pixfmt != V4L2_PIX_FMT_YUV420)
				buf->bytesused = pdev->frame_size + sizeof(struct pwc_raw_frame);
			else
				buf->bytesused = pdev->view.size;
			buf->field = V4L2_FIELD_NONE;
			buf->memory = V4L2_MEMORY_MMAP;
			//buf->flags = V4L2_BUF_FLAG_MAPPED;
			buf->length = pdev->len_per_image;

			PWC_DEBUG_READ("VIDIOC_QUERYBUF: index=%d\n",buf->index);
			PWC_DEBUG_READ("VIDIOC_QUERYBUF: m.offset=%d\n",buf->m.offset);
			PWC_DEBUG_READ("VIDIOC_QUERYBUF: bytesused=%d\n",buf->bytesused);

			return 0;
		}

		case VIDIOC_QBUF:
		{
			struct v4l2_buffer *buf = arg;

			PWC_DEBUG_IOCTL("ioctl(VIDIOC_QBUF) index=%d\n",buf->index);
			if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
				return -EINVAL;
			if (buf->memory != V4L2_MEMORY_MMAP)
				return -EINVAL;
			if (buf->index >= pwc_mbufs)
				return -EINVAL;

			buf->flags |= V4L2_BUF_FLAG_QUEUED;
			buf->flags &= ~V4L2_BUF_FLAG_DONE;

			return 0;
		}

		case VIDIOC_DQBUF:
		{
			struct v4l2_buffer *buf = arg;
			int ret;

			PWC_DEBUG_IOCTL("ioctl(VIDIOC_DQBUF)\n");

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

			/* Add ourselves to the frame wait-queue.

			   FIXME: needs auditing for safety.
			   QUESTION: In what respect? I think that using the
				     frameq is safe now.
			 */
			add_wait_queue(&pdev->frameq, &wait);
			while (pdev->full_frames == NULL) {
				if (pdev->error_status) {
					remove_wait_queue(&pdev->frameq, &wait);
					set_current_state(TASK_RUNNING);
					return -pdev->error_status;
				}

				if (signal_pending(current)) {
					remove_wait_queue(&pdev->frameq, &wait);
					set_current_state(TASK_RUNNING);
					return -ERESTARTSYS;
				}
				schedule();
				set_current_state(TASK_INTERRUPTIBLE);
			}
			remove_wait_queue(&pdev->frameq, &wait);
			set_current_state(TASK_RUNNING);

			PWC_DEBUG_IOCTL("VIDIOC_DQBUF: frame ready.\n");
			/* Decompress data in pdev->images[pdev->fill_image] */
			ret = pwc_handle_frame(pdev);
			if (ret)
				return -EFAULT;
			PWC_DEBUG_IOCTL("VIDIOC_DQBUF: after pwc_handle_frame\n");

			buf->index = pdev->fill_image;
			if (pdev->pixfmt != V4L2_PIX_FMT_YUV420)
				buf->bytesused = pdev->frame_size + sizeof(struct pwc_raw_frame);
			else
				buf->bytesused = pdev->view.size;
			buf->flags = V4L2_BUF_FLAG_MAPPED;
			buf->field = V4L2_FIELD_NONE;
			do_gettimeofday(&buf->timestamp);
			buf->sequence = 0;
			buf->memory = V4L2_MEMORY_MMAP;
			buf->m.offset = pdev->fill_image * pdev->len_per_image;
			buf->length = pdev->len_per_image;
			pwc_next_image(pdev);

			PWC_DEBUG_IOCTL("VIDIOC_DQBUF: buf->index=%d\n",buf->index);
			PWC_DEBUG_IOCTL("VIDIOC_DQBUF: buf->length=%d\n",buf->length);
			PWC_DEBUG_IOCTL("VIDIOC_DQBUF: m.offset=%d\n",buf->m.offset);
			PWC_DEBUG_IOCTL("VIDIOC_DQBUF: bytesused=%d\n",buf->bytesused);
			PWC_DEBUG_IOCTL("VIDIOC_DQBUF: leaving\n");
			return 0;

		}

		case VIDIOC_STREAMON:
		{
			/* WARNING: pwc_try_video_mode() called pwc_isoc_init */
			pwc_isoc_init(pdev);
			return 0;
		}

		case VIDIOC_STREAMOFF:
		{
			pwc_isoc_cleanup(pdev);
			return 0;
		}

		case VIDIOC_ENUM_FRAMESIZES:
		{
			struct v4l2_frmsizeenum *fsize = arg;
			unsigned int i = 0, index = fsize->index;

			if (fsize->pixel_format == V4L2_PIX_FMT_YUV420) {
				for (i = 0; i < PSZ_MAX; i++) {
					if (pdev->image_mask & (1UL << i)) {
						if (!index--) {
							fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
							fsize->discrete.width = pwc_image_sizes[i].x;
							fsize->discrete.height = pwc_image_sizes[i].y;
							return 0;
						}
					}
				}
			} else if (fsize->index == 0 &&
				   ((fsize->pixel_format == V4L2_PIX_FMT_PWC1 && DEVICE_USE_CODEC1(pdev->type)) ||
				    (fsize->pixel_format == V4L2_PIX_FMT_PWC2 && DEVICE_USE_CODEC23(pdev->type)))) {

				fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
				fsize->discrete.width = pdev->abs_max.x;
				fsize->discrete.height = pdev->abs_max.y;
				return 0;
			}
			return -EINVAL;
		}

		case VIDIOC_ENUM_FRAMEINTERVALS:
		{
			struct v4l2_frmivalenum *fival = arg;
			int size = -1;
			unsigned int i;

			for (i = 0; i < PSZ_MAX; i++) {
				if (pwc_image_sizes[i].x == fival->width &&
				    pwc_image_sizes[i].y == fival->height) {
					size = i;
					break;
				}
			}

			/* TODO: Support raw format */
			if (size < 0 || fival->pixel_format != V4L2_PIX_FMT_YUV420) {
				return -EINVAL;
			}

			i = pwc_get_fps(pdev, fival->index, size);
			if (!i)
				return -EINVAL;

			fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
			fival->discrete.numerator = 1;
			fival->discrete.denominator = i;

			return 0;
		}

		default:
			return pwc_ioctl(pdev, cmd, arg);
	} /* ..switch */
	return 0;
}

/* vim: set cino= formatoptions=croql cindent shiftwidth=8 tabstop=8: */