linux/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;

	if (pdev->iso_init)
		return -EBUSY;

	PWC_DEBUG_IOCTL("Trying to set 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_set_video_mode(pdev,
				 f->fmt.pix.width,
				 f->fmt.pix.height,
				 fps,
				 compression,
				 snapshot);

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

	if (ret)
		return ret;

	pdev->pixfmt = pixelformat;

	pwc_vidioc_fill_fmt(pdev, f);

	return 0;

}

static int pwc_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
{
	struct video_device *vdev = video_devdata(file);
	struct pwc_device *pdev = video_drvdata(file);

	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;
}

static int pwc_enum_input(struct file *file, void *fh, struct v4l2_input *i)
{
	if (i->index)	/* Only one INPUT is supported */
		return -EINVAL;

	strcpy(i->name, "usb");
	return 0;
}

static int pwc_g_input(struct file *file, void *fh, unsigned int *i)
{
	*i = 0;
	return 0;
}

static int pwc_s_input(struct file *file, void *fh, unsigned int i)
{
	return i ? -EINVAL : 0;
}

static int pwc_queryctrl(struct file *file, void *fh, struct v4l2_queryctrl *c)
{
	int i;

	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;
		}
	}
	return -EINVAL;
}

static int pwc_g_ctrl(struct file *file, void *fh, struct v4l2_control *c)
{
	struct pwc_device *pdev = video_drvdata(file);
	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;
}

static int pwc_s_ctrl(struct file *file, void *fh, struct v4l2_control *c)
{
	struct pwc_device *pdev = video_drvdata(file);
	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;
}

static int pwc_enum_fmt_vid_cap(struct file *file, void *fh, struct v4l2_fmtdesc *f)
{
	struct pwc_device *pdev = video_drvdata(file);

	/* We only support two format: the raw format, and YUV */
	switch (f->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;
}

static int pwc_g_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f)
{
	struct pwc_device *pdev = video_drvdata(file);

	PWC_DEBUG_IOCTL("ioctl(VIDIOC_G_FMT) return size %dx%d\n",
			pdev->image.x, pdev->image.y);
	pwc_vidioc_fill_fmt(pdev, f);
	return 0;
}

static int pwc_try_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f)
{
	struct pwc_device *pdev = video_drvdata(file);

	return pwc_vidioc_try_fmt(pdev, f);
}

static int pwc_s_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f)
{
	struct pwc_device *pdev = video_drvdata(file);

	return pwc_vidioc_set_fmt(pdev, f);
}

static int pwc_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *rb)
{
	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;
}

static int pwc_querybuf(struct file *file, void *fh, struct v4l2_buffer *buf)
{
	struct pwc_device *pdev = video_drvdata(file);
	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;
	}
	index = buf->index;
	if (index < 0 || index >= pwc_mbufs) {
		PWC_DEBUG_IOCTL("ioctl(VIDIOC_QUERYBUF) Bad index %d\n", buf->index);
		return -EINVAL;
	}

	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;
}

static int pwc_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
{
	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;
}

static int pwc_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
{
	DECLARE_WAITQUEUE(wait, current);
	struct pwc_device *pdev = video_drvdata(file);
	int ret;

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

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

	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;
		}
		mutex_unlock(&pdev->modlock);
		schedule();
		set_current_state(TASK_INTERRUPTIBLE);
		mutex_lock(&pdev->modlock);
	}
	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;

}

static int pwc_streamon(struct file *file, void *fh, enum v4l2_buf_type i)
{
	struct pwc_device *pdev = video_drvdata(file);

	return pwc_isoc_init(pdev);
}

static int pwc_streamoff(struct file *file, void *fh, enum v4l2_buf_type i)
{
	struct pwc_device *pdev = video_drvdata(file);

	pwc_isoc_cleanup(pdev);
	return 0;
}

static int pwc_enum_framesizes(struct file *file, void *fh,
					 struct v4l2_frmsizeenum *fsize)
{
	struct pwc_device *pdev = video_drvdata(file);
	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;
}

static int pwc_enum_frameintervals(struct file *file, void *fh,
					   struct v4l2_frmivalenum *fival)
{
	struct pwc_device *pdev = video_drvdata(file);
	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;
}

static long pwc_default(struct file *file, void *fh, bool valid_prio,
			int cmd, void *arg)
{
	struct pwc_device *pdev = video_drvdata(file);

	return pwc_ioctl(pdev, cmd, arg);
}

const struct v4l2_ioctl_ops pwc_ioctl_ops = {
	.vidioc_querycap		    = pwc_querycap,
	.vidioc_enum_input		    = pwc_enum_input,
	.vidioc_g_input			    = pwc_g_input,
	.vidioc_s_input			    = pwc_s_input,
	.vidioc_enum_fmt_vid_cap	    = pwc_enum_fmt_vid_cap,
	.vidioc_g_fmt_vid_cap		    = pwc_g_fmt_vid_cap,
	.vidioc_s_fmt_vid_cap		    = pwc_s_fmt_vid_cap,
	.vidioc_try_fmt_vid_cap		    = pwc_try_fmt_vid_cap,
	.vidioc_queryctrl		    = pwc_queryctrl,
	.vidioc_g_ctrl			    = pwc_g_ctrl,
	.vidioc_s_ctrl			    = pwc_s_ctrl,
	.vidioc_reqbufs			    = pwc_reqbufs,
	.vidioc_querybuf		    = pwc_querybuf,
	.vidioc_qbuf			    = pwc_qbuf,
	.vidioc_dqbuf			    = pwc_dqbuf,
	.vidioc_streamon		    = pwc_streamon,
	.vidioc_streamoff		    = pwc_streamoff,
	.vidioc_enum_framesizes		    = pwc_enum_framesizes,
	.vidioc_enum_frameintervals	    = pwc_enum_frameintervals,
	.vidioc_default		    = pwc_default,
};


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