Merge branch 'linus' into core/softlockup

Conflicts:

	kernel/softlockup.c

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1105 insertions, 0 deletions

diff --git a/drivers/media/video/uvc/uvc_v4l2.c b/drivers/media/video/uvc/uvc_v4l2.c
new file mode 100644
index 00000000000..2e0a66575bb
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_v4l2.c
@@ -0,0 +1,1105 @@
+/*
+ *      uvc_v4l2.c  --  USB Video Class driver - V4L2 API
+ *
+ *      Copyright (C) 2005-2008
+ *          Laurent Pinchart (laurent.pinchart@skynet.be)
+ *
+ *      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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/version.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/videodev2.h>
+#include <linux/vmalloc.h>
+#include <linux/mm.h>
+#include <linux/wait.h>
+#include <asm/atomic.h>
+
+#include <media/v4l2-common.h>
+
+#include "uvcvideo.h"
+
+/* ------------------------------------------------------------------------
+ * V4L2 interface
+ */
+
+/*
+ * Mapping V4L2 controls to UVC controls can be straighforward if done well.
+ * Most of the UVC controls exist in V4L2, and can be mapped directly. Some
+ * must be grouped (for instance the Red Balance, Blue Balance and Do White
+ * Balance V4L2 controls use the White Balance Component UVC control) or
+ * otherwise translated. The approach we take here is to use a translation
+ * table for the controls which can be mapped directly, and handle the others
+ * manually.
+ */
+static int uvc_v4l2_query_menu(struct uvc_video_device *video,
+	struct v4l2_querymenu *query_menu)
+{
+	struct uvc_menu_info *menu_info;
+	struct uvc_control_mapping *mapping;
+	struct uvc_control *ctrl;
+
+	ctrl = uvc_find_control(video, query_menu->id, &mapping);
+	if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU)
+		return -EINVAL;
+
+	if (query_menu->index >= mapping->menu_count)
+		return -EINVAL;
+
+	menu_info = &mapping->menu_info[query_menu->index];
+	strncpy(query_menu->name, menu_info->name, 32);
+	return 0;
+}
+
+/*
+ * Find the frame interval closest to the requested frame interval for the
+ * given frame format and size. This should be done by the device as part of
+ * the Video Probe and Commit negotiation, but some hardware don't implement
+ * that feature.
+ */
+static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
+{
+	unsigned int i;
+
+	if (frame->bFrameIntervalType) {
+		__u32 best = -1, dist;
+
+		for (i = 0; i < frame->bFrameIntervalType; ++i) {
+			dist = interval > frame->dwFrameInterval[i]
+			     ? interval - frame->dwFrameInterval[i]
+			     : frame->dwFrameInterval[i] - interval;
+
+			if (dist > best)
+				break;
+
+			best = dist;
+		}
+
+		interval = frame->dwFrameInterval[i-1];
+	} else {
+		const __u32 min = frame->dwFrameInterval[0];
+		const __u32 max = frame->dwFrameInterval[1];
+		const __u32 step = frame->dwFrameInterval[2];
+
+		interval = min + (interval - min + step/2) / step * step;
+		if (interval > max)
+			interval = max;
+	}
+
+	return interval;
+}
+
+static int uvc_v4l2_try_format(struct uvc_video_device *video,
+	struct v4l2_format *fmt, struct uvc_streaming_control *probe,
+	struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
+{
+	struct uvc_format *format = NULL;
+	struct uvc_frame *frame = NULL;
+	__u16 rw, rh;
+	unsigned int d, maxd;
+	unsigned int i;
+	__u32 interval;
+	int ret = 0;
+	__u8 *fcc;
+
+	if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
+	uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
+			fmt->fmt.pix.pixelformat,
+			fcc[0], fcc[1], fcc[2], fcc[3],
+			fmt->fmt.pix.width, fmt->fmt.pix.height);
+
+	/* Check if the hardware supports the requested format. */
+	for (i = 0; i < video->streaming->nformats; ++i) {
+		format = &video->streaming->format[i];
+		if (format->fcc == fmt->fmt.pix.pixelformat)
+			break;
+	}
+
+	if (format == NULL || format->fcc != fmt->fmt.pix.pixelformat) {
+		uvc_trace(UVC_TRACE_FORMAT, "Unsupported format 0x%08x.\n",
+				fmt->fmt.pix.pixelformat);
+		return -EINVAL;
+	}
+
+	/* Find the closest image size. The distance between image sizes is
+	 * the size in pixels of the non-overlapping regions between the
+	 * requested size and the frame-specified size.
+	 */
+	rw = fmt->fmt.pix.width;
+	rh = fmt->fmt.pix.height;
+	maxd = (unsigned int)-1;
+
+	for (i = 0; i < format->nframes; ++i) {
+		__u16 w = format->frame[i].wWidth;
+		__u16 h = format->frame[i].wHeight;
+
+		d = min(w, rw) * min(h, rh);
+		d = w*h + rw*rh - 2*d;
+		if (d < maxd) {
+			maxd = d;
+			frame = &format->frame[i];
+		}
+
+		if (maxd == 0)
+			break;
+	}
+
+	if (frame == NULL) {
+		uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
+				fmt->fmt.pix.width, fmt->fmt.pix.height);
+		return -EINVAL;
+	}
+
+	/* Use the default frame interval. */
+	interval = frame->dwDefaultFrameInterval;
+	uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
+		"(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
+		(100000000/interval)%10);
+
+	/* Set the format index, frame index and frame interval. */
+	memset(probe, 0, sizeof *probe);
+	probe->bmHint = 1;	/* dwFrameInterval */
+	probe->bFormatIndex = format->index;
+	probe->bFrameIndex = frame->bFrameIndex;
+	probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
+	/* Some webcams stall the probe control set request when the
+	 * dwMaxVideoFrameSize field is set to zero. The UVC specification
+	 * clearly states that the field is read-only from the host, so this
+	 * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
+	 * the webcam to work around the problem.
+	 *
+	 * The workaround could probably be enabled for all webcams, so the
+	 * quirk can be removed if needed. It's currently useful to detect
+	 * webcam bugs and fix them before they hit the market (providing
+	 * developers test their webcams with the Linux driver as well as with
+	 * the Windows driver).
+	 */
+	if (video->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
+		probe->dwMaxVideoFrameSize =
+			video->streaming->ctrl.dwMaxVideoFrameSize;
+
+	/* Probe the device */
+	if ((ret = uvc_probe_video(video, probe)) < 0)
+		goto done;
+
+	fmt->fmt.pix.width = frame->wWidth;
+	fmt->fmt.pix.height = frame->wHeight;
+	fmt->fmt.pix.field = V4L2_FIELD_NONE;
+	fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
+	fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
+	fmt->fmt.pix.colorspace = format->colorspace;
+	fmt->fmt.pix.priv = 0;
+
+	if (uvc_format != NULL)
+		*uvc_format = format;
+	if (uvc_frame != NULL)
+		*uvc_frame = frame;
+
+done:
+	return ret;
+}
+
+static int uvc_v4l2_get_format(struct uvc_video_device *video,
+	struct v4l2_format *fmt)
+{
+	struct uvc_format *format = video->streaming->cur_format;
+	struct uvc_frame *frame = video->streaming->cur_frame;
+
+	if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	if (format == NULL || frame == NULL)
+		return -EINVAL;
+
+	fmt->fmt.pix.pixelformat = format->fcc;
+	fmt->fmt.pix.width = frame->wWidth;
+	fmt->fmt.pix.height = frame->wHeight;
+	fmt->fmt.pix.field = V4L2_FIELD_NONE;
+	fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
+	fmt->fmt.pix.sizeimage = video->streaming->ctrl.dwMaxVideoFrameSize;
+	fmt->fmt.pix.colorspace = format->colorspace;
+	fmt->fmt.pix.priv = 0;
+
+	return 0;
+}
+
+static int uvc_v4l2_set_format(struct uvc_video_device *video,
+	struct v4l2_format *fmt)
+{
+	struct uvc_streaming_control probe;
+	struct uvc_format *format;
+	struct uvc_frame *frame;
+	int ret;
+
+	if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	if (uvc_queue_streaming(&video->queue))
+		return -EBUSY;
+
+	ret = uvc_v4l2_try_format(video, fmt, &probe, &format, &frame);
+	if (ret < 0)
+		return ret;
+
+	if ((ret = uvc_set_video_ctrl(video, &probe, 0)) < 0)
+		return ret;
+
+	memcpy(&video->streaming->ctrl, &probe, sizeof probe);
+	video->streaming->cur_format = format;
+	video->streaming->cur_frame = frame;
+
+	return 0;
+}
+
+static int uvc_v4l2_get_streamparm(struct uvc_video_device *video,
+		struct v4l2_streamparm *parm)
+{
+	uint32_t numerator, denominator;
+
+	if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	numerator = video->streaming->ctrl.dwFrameInterval;
+	denominator = 10000000;
+	uvc_simplify_fraction(&numerator, &denominator, 8, 333);
+
+	memset(parm, 0, sizeof *parm);
+	parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
+	parm->parm.capture.capturemode = 0;
+	parm->parm.capture.timeperframe.numerator = numerator;
+	parm->parm.capture.timeperframe.denominator = denominator;
+	parm->parm.capture.extendedmode = 0;
+	parm->parm.capture.readbuffers = 0;
+
+	return 0;
+}
+
+static int uvc_v4l2_set_streamparm(struct uvc_video_device *video,
+		struct v4l2_streamparm *parm)
+{
+	struct uvc_frame *frame = video->streaming->cur_frame;
+	struct uvc_streaming_control probe;
+	uint32_t interval;
+	int ret;
+
+	if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	if (uvc_queue_streaming(&video->queue))
+		return -EBUSY;
+
+	memcpy(&probe, &video->streaming->ctrl, sizeof probe);
+	interval = uvc_fraction_to_interval(
+			parm->parm.capture.timeperframe.numerator,
+			parm->parm.capture.timeperframe.denominator);
+
+	uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
+			parm->parm.capture.timeperframe.numerator,
+			parm->parm.capture.timeperframe.denominator,
+			interval);
+	probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
+
+	/* Probe the device with the new settings. */
+	if ((ret = uvc_probe_video(video, &probe)) < 0)
+		return ret;
+
+	/* Commit the new settings. */
+	if ((ret = uvc_set_video_ctrl(video, &probe, 0)) < 0)
+		return ret;
+
+	memcpy(&video->streaming->ctrl, &probe, sizeof probe);
+
+	/* Return the actual frame period. */
+	parm->parm.capture.timeperframe.numerator = probe.dwFrameInterval;
+	parm->parm.capture.timeperframe.denominator = 10000000;
+	uvc_simplify_fraction(&parm->parm.capture.timeperframe.numerator,
+				&parm->parm.capture.timeperframe.denominator,
+				8, 333);
+
+	return 0;
+}
+
+/* ------------------------------------------------------------------------
+ * Privilege management
+ */
+
+/*
+ * Privilege management is the multiple-open implementation basis. The current
+ * implementation is completely transparent for the end-user and doesn't
+ * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
+ * Those ioctls enable finer control on the device (by making possible for a
+ * user to request exclusive access to a device), but are not mature yet.
+ * Switching to the V4L2 priority mechanism might be considered in the future
+ * if this situation changes.
+ *
+ * Each open instance of a UVC device can either be in a privileged or
+ * unprivileged state. Only a single instance can be in a privileged state at
+ * a given time. Trying to perform an operation which requires privileges will
+ * automatically acquire the required privileges if possible, or return -EBUSY
+ * otherwise. Privileges are dismissed when closing the instance.
+ *
+ * Operations which require privileges are:
+ *
+ * - VIDIOC_S_INPUT
+ * - VIDIOC_S_PARM
+ * - VIDIOC_S_FMT
+ * - VIDIOC_TRY_FMT
+ * - VIDIOC_REQBUFS
+ */
+static int uvc_acquire_privileges(struct uvc_fh *handle)
+{
+	int ret = 0;
+
+	/* Always succeed if the handle is already privileged. */
+	if (handle->state == UVC_HANDLE_ACTIVE)
+		return 0;
+
+	/* Check if the device already has a privileged handle. */
+	mutex_lock(&uvc_driver.open_mutex);
+	if (atomic_inc_return(&handle->device->active) != 1) {
+		atomic_dec(&handle->device->active);
+		ret = -EBUSY;
+		goto done;
+	}
+
+	handle->state = UVC_HANDLE_ACTIVE;
+
+done:
+	mutex_unlock(&uvc_driver.open_mutex);
+	return ret;
+}
+
+static void uvc_dismiss_privileges(struct uvc_fh *handle)
+{
+	if (handle->state == UVC_HANDLE_ACTIVE)
+		atomic_dec(&handle->device->active);
+
+	handle->state = UVC_HANDLE_PASSIVE;
+}
+
+static int uvc_has_privileges(struct uvc_fh *handle)
+{
+	return handle->state == UVC_HANDLE_ACTIVE;
+}
+
+/* ------------------------------------------------------------------------
+ * V4L2 file operations
+ */
+
+static int uvc_v4l2_open(struct inode *inode, struct file *file)
+{
+	struct video_device *vdev;
+	struct uvc_video_device *video;
+	struct uvc_fh *handle;
+	int ret = 0;
+
+	uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
+	mutex_lock(&uvc_driver.open_mutex);
+	vdev = video_devdata(file);
+	video = video_get_drvdata(vdev);
+
+	if (video->dev->state & UVC_DEV_DISCONNECTED) {
+		ret = -ENODEV;
+		goto done;
+	}
+
+	ret = usb_autopm_get_interface(video->dev->intf);
+	if (ret < 0)
+		goto done;
+
+	/* Create the device handle. */
+	handle = kzalloc(sizeof *handle, GFP_KERNEL);
+	if (handle == NULL) {
+		usb_autopm_put_interface(video->dev->intf);
+		ret = -ENOMEM;
+		goto done;
+	}
+
+	handle->device = video;
+	handle->state = UVC_HANDLE_PASSIVE;
+	file->private_data = handle;
+
+	kref_get(&video->dev->kref);
+
+done:
+	mutex_unlock(&uvc_driver.open_mutex);
+	return ret;
+}
+
+static int uvc_v4l2_release(struct inode *inode, struct file *file)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct uvc_video_device *video = video_get_drvdata(vdev);
+	struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
+
+	uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
+
+	/* Only free resources if this is a privileged handle. */
+	if (uvc_has_privileges(handle)) {
+		uvc_video_enable(video, 0);
+
+		mutex_lock(&video->queue.mutex);
+		if (uvc_free_buffers(&video->queue) < 0)
+			uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
+					"free buffers.\n");
+		mutex_unlock(&video->queue.mutex);
+	}
+
+	/* Release the file handle. */
+	uvc_dismiss_privileges(handle);
+	kfree(handle);
+	file->private_data = NULL;
+
+	usb_autopm_put_interface(video->dev->intf);
+	kref_put(&video->dev->kref, uvc_delete);
+	return 0;
+}
+
+static int uvc_v4l2_do_ioctl(struct inode *inode, struct file *file,
+		     unsigned int cmd, void *arg)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct uvc_video_device *video = video_get_drvdata(vdev);
+	struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
+	int ret = 0;
+
+	if (uvc_trace_param & UVC_TRACE_IOCTL)
+		v4l_printk_ioctl(cmd);
+
+	switch (cmd) {
+	/* Query capabilities */
+	case VIDIOC_QUERYCAP:
+	{
+		struct v4l2_capability *cap = arg;
+
+		memset(cap, 0, sizeof *cap);
+		strncpy(cap->driver, "uvcvideo", sizeof cap->driver);
+		strncpy(cap->card, vdev->name, 32);
+		strncpy(cap->bus_info, video->dev->udev->bus->bus_name,
+			sizeof cap->bus_info);
+		cap->version = DRIVER_VERSION_NUMBER;
+		cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
+				  | V4L2_CAP_STREAMING;
+		break;
+	}
+
+	/* Get, Set & Query control */
+	case VIDIOC_QUERYCTRL:
+		return uvc_query_v4l2_ctrl(video, arg);
+
+	case VIDIOC_G_CTRL:
+	{
+		struct v4l2_control *ctrl = arg;
+		struct v4l2_ext_control xctrl;
+
+		memset(&xctrl, 0, sizeof xctrl);
+		xctrl.id = ctrl->id;
+
+		uvc_ctrl_begin(video);
+		ret = uvc_ctrl_get(video, &xctrl);
+		uvc_ctrl_rollback(video);
+		if (ret >= 0)
+			ctrl->value = xctrl.value;
+		break;
+	}
+
+	case VIDIOC_S_CTRL:
+	{
+		struct v4l2_control *ctrl = arg;
+		struct v4l2_ext_control xctrl;
+
+		memset(&xctrl, 0, sizeof xctrl);
+		xctrl.id = ctrl->id;
+		xctrl.value = ctrl->value;
+
+		uvc_ctrl_begin(video);
+		ret = uvc_ctrl_set(video, &xctrl);
+		if (ret < 0) {
+			uvc_ctrl_rollback(video);
+			return ret;
+		}
+		ret = uvc_ctrl_commit(video);
+		break;
+	}
+
+	case VIDIOC_QUERYMENU:
+		return uvc_v4l2_query_menu(video, arg);
+
+	case VIDIOC_G_EXT_CTRLS:
+	{
+		struct v4l2_ext_controls *ctrls = arg;
+		struct v4l2_ext_control *ctrl = ctrls->controls;
+		unsigned int i;
+
+		uvc_ctrl_begin(video);
+		for (i = 0; i < ctrls->count; ++ctrl, ++i) {
+			ret = uvc_ctrl_get(video, ctrl);
+			if (ret < 0) {
+				uvc_ctrl_rollback(video);
+				ctrls->error_idx = i;
+				return ret;
+			}
+		}
+		ctrls->error_idx = 0;
+		ret = uvc_ctrl_rollback(video);
+		break;
+	}
+
+	case VIDIOC_S_EXT_CTRLS:
+	case VIDIOC_TRY_EXT_CTRLS:
+	{
+		struct v4l2_ext_controls *ctrls = arg;
+		struct v4l2_ext_control *ctrl = ctrls->controls;
+		unsigned int i;
+
+		ret = uvc_ctrl_begin(video);
+		if (ret < 0)
+			return ret;
+
+		for (i = 0; i < ctrls->count; ++ctrl, ++i) {
+			ret = uvc_ctrl_set(video, ctrl);
+			if (ret < 0) {
+				uvc_ctrl_rollback(video);
+				ctrls->error_idx = i;
+				return ret;
+			}
+		}
+
+		ctrls->error_idx = 0;
+
+		if (cmd == VIDIOC_S_EXT_CTRLS)
+			ret = uvc_ctrl_commit(video);
+		else
+			ret = uvc_ctrl_rollback(video);
+		break;
+	}
+
+	/* Get, Set & Enum input */
+	case VIDIOC_ENUMINPUT:
+	{
+		const struct uvc_entity *selector = video->selector;
+		struct v4l2_input *input = arg;
+		struct uvc_entity *iterm = NULL;
+		u32 index = input->index;
+		int pin = 0;
+
+		if (selector == NULL ||
+		    (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
+			if (index != 0)
+				return -EINVAL;
+			iterm = list_first_entry(&video->iterms,
+					struct uvc_entity, chain);
+			pin = iterm->id;
+		} else if (pin < selector->selector.bNrInPins) {
+			pin = selector->selector.baSourceID[index];
+			list_for_each_entry(iterm, video->iterms.next, chain) {
+				if (iterm->id == pin)
+					break;
+			}
+		}
+
+		if (iterm == NULL || iterm->id != pin)
+			return -EINVAL;
+
+		memset(input, 0, sizeof *input);
+		input->index = index;
+		strncpy(input->name, iterm->name, sizeof input->name);
+		if (UVC_ENTITY_TYPE(iterm) == ITT_CAMERA)
+			input->type = V4L2_INPUT_TYPE_CAMERA;
+		break;
+	}
+
+	case VIDIOC_G_INPUT:
+	{
+		u8 input;
+
+		if (video->selector == NULL ||
+		    (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
+			*(int *)arg = 0;
+			break;
+		}
+
+		ret = uvc_query_ctrl(video->dev, GET_CUR, video->selector->id,
+			video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
+			&input, 1);
+		if (ret < 0)
+			return ret;
+
+		*(int *)arg = input - 1;
+		break;
+	}
+
+	case VIDIOC_S_INPUT:
+	{
+		u8 input = *(u32 *)arg + 1;
+
+		if ((ret = uvc_acquire_privileges(handle)) < 0)
+			return ret;
+
+		if (video->selector == NULL ||
+		    (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
+			if (input != 1)
+				return -EINVAL;
+			break;
+		}
+
+		if (input > video->selector->selector.bNrInPins)
+			return -EINVAL;
+
+		return uvc_query_ctrl(video->dev, SET_CUR, video->selector->id,
+			video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
+			&input, 1);
+	}
+
+	/* Try, Get, Set & Enum format */
+	case VIDIOC_ENUM_FMT:
+	{
+		struct v4l2_fmtdesc *fmt = arg;
+		struct uvc_format *format;
+
+		if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+		    fmt->index >= video->streaming->nformats)
+			return -EINVAL;
+
+		format = &video->streaming->format[fmt->index];
+		fmt->flags = 0;
+		if (format->flags & UVC_FMT_FLAG_COMPRESSED)
+			fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
+		strncpy(fmt->description, format->name,
+			sizeof fmt->description);
+		fmt->description[sizeof fmt->description - 1] = 0;
+		fmt->pixelformat = format->fcc;
+		break;
+	}
+
+	case VIDIOC_TRY_FMT:
+	{
+		struct uvc_streaming_control probe;
+
+		if ((ret = uvc_acquire_privileges(handle)) < 0)
+			return ret;
+
+		return uvc_v4l2_try_format(video, arg, &probe, NULL, NULL);
+	}
+
+	case VIDIOC_S_FMT:
+		if ((ret = uvc_acquire_privileges(handle)) < 0)
+			return ret;
+
+		return uvc_v4l2_set_format(video, arg);
+
+	case VIDIOC_G_FMT:
+		return uvc_v4l2_get_format(video, arg);
+
+	/* Frame size enumeration */
+	case VIDIOC_ENUM_FRAMESIZES:
+	{
+		struct v4l2_frmsizeenum *fsize = arg;
+		struct uvc_format *format = NULL;
+		struct uvc_frame *frame;
+		int i;
+
+		/* Look for the given pixel format */
+		for (i = 0; i < video->streaming->nformats; i++) {
+			if (video->streaming->format[i].fcc ==
+					fsize->pixel_format) {
+				format = &video->streaming->format[i];
+				break;
+			}
+		}
+		if (format == NULL)
+			return -EINVAL;
+
+		if (fsize->index >= format->nframes)
+			return -EINVAL;
+
+		frame = &format->frame[fsize->index];
+		fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
+		fsize->discrete.width = frame->wWidth;
+		fsize->discrete.height = frame->wHeight;
+		break;
+	}
+
+	/* Frame interval enumeration */
+	case VIDIOC_ENUM_FRAMEINTERVALS:
+	{
+		struct v4l2_frmivalenum *fival = arg;
+		struct uvc_format *format = NULL;
+		struct uvc_frame *frame = NULL;
+		int i;
+
+		/* Look for the given pixel format and frame size */
+		for (i = 0; i < video->streaming->nformats; i++) {
+			if (video->streaming->format[i].fcc ==
+					fival->pixel_format) {
+				format = &video->streaming->format[i];
+				break;
+			}
+		}
+		if (format == NULL)
+			return -EINVAL;
+
+		for (i = 0; i < format->nframes; i++) {
+			if (format->frame[i].wWidth == fival->width &&
+			    format->frame[i].wHeight == fival->height) {
+				frame = &format->frame[i];
+				break;
+			}
+		}
+		if (frame == NULL)
+			return -EINVAL;
+
+		if (frame->bFrameIntervalType) {
+			if (fival->index >= frame->bFrameIntervalType)
+				return -EINVAL;
+
+			fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
+			fival->discrete.numerator =
+				frame->dwFrameInterval[fival->index];
+			fival->discrete.denominator = 10000000;
+			uvc_simplify_fraction(&fival->discrete.numerator,
+				&fival->discrete.denominator, 8, 333);
+		} else {
+			fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
+			fival->stepwise.min.numerator =
+				frame->dwFrameInterval[0];
+			fival->stepwise.min.denominator = 10000000;
+			fival->stepwise.max.numerator =
+				frame->dwFrameInterval[1];
+			fival->stepwise.max.denominator = 10000000;
+			fival->stepwise.step.numerator =
+				frame->dwFrameInterval[2];
+			fival->stepwise.step.denominator = 10000000;
+			uvc_simplify_fraction(&fival->stepwise.min.numerator,
+				&fival->stepwise.min.denominator, 8, 333);
+			uvc_simplify_fraction(&fival->stepwise.max.numerator,
+				&fival->stepwise.max.denominator, 8, 333);
+			uvc_simplify_fraction(&fival->stepwise.step.numerator,
+				&fival->stepwise.step.denominator, 8, 333);
+		}
+		break;
+	}
+
+	/* Get & Set streaming parameters */
+	case VIDIOC_G_PARM:
+		return uvc_v4l2_get_streamparm(video, arg);
+
+	case VIDIOC_S_PARM:
+		if ((ret = uvc_acquire_privileges(handle)) < 0)
+			return ret;
+
+		return uvc_v4l2_set_streamparm(video, arg);
+
+	/* Cropping and scaling */
+	case VIDIOC_CROPCAP:
+	{
+		struct v4l2_cropcap *ccap = arg;
+		struct uvc_frame *frame = video->streaming->cur_frame;
+
+		if (ccap->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+			return -EINVAL;
+
+		ccap->bounds.left = 0;
+		ccap->bounds.top = 0;
+		ccap->bounds.width = frame->wWidth;
+		ccap->bounds.height = frame->wHeight;
+
+		ccap->defrect = ccap->bounds;
+
+		ccap->pixelaspect.numerator = 1;
+		ccap->pixelaspect.denominator = 1;
+		break;
+	}
+
+	case VIDIOC_G_CROP:
+	case VIDIOC_S_CROP:
+		return -EINVAL;
+
+	/* Buffers & streaming */
+	case VIDIOC_REQBUFS:
+	{
+		struct v4l2_requestbuffers *rb = arg;
+		unsigned int bufsize =
+			video->streaming->ctrl.dwMaxVideoFrameSize;
+
+		if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+		    rb->memory != V4L2_MEMORY_MMAP)
+			return -EINVAL;
+
+		if ((ret = uvc_acquire_privileges(handle)) < 0)
+			return ret;
+
+		ret = uvc_alloc_buffers(&video->queue, rb->count, bufsize);
+		if (ret < 0)
+			return ret;
+
+		if (!(video->streaming->cur_format->flags &
+		    UVC_FMT_FLAG_COMPRESSED))
+			video->queue.flags |= UVC_QUEUE_DROP_INCOMPLETE;
+
+		rb->count = ret;
+		ret = 0;
+		break;
+	}
+
+	case VIDIOC_QUERYBUF:
+	{
+		struct v4l2_buffer *buf = arg;
+
+		if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+			return -EINVAL;
+
+		if (!uvc_has_privileges(handle))
+			return -EBUSY;
+
+		return uvc_query_buffer(&video->queue, buf);
+	}
+
+	case VIDIOC_QBUF:
+		if (!uvc_has_privileges(handle))
+			return -EBUSY;
+
+		return uvc_queue_buffer(&video->queue, arg);
+
+	case VIDIOC_DQBUF:
+		if (!uvc_has_privileges(handle))
+			return -EBUSY;
+
+		return uvc_dequeue_buffer(&video->queue, arg,
+			file->f_flags & O_NONBLOCK);
+
+	case VIDIOC_STREAMON:
+	{
+		int *type = arg;
+
+		if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+			return -EINVAL;
+
+		if (!uvc_has_privileges(handle))
+			return -EBUSY;
+
+		if ((ret = uvc_video_enable(video, 1)) < 0)
+			return ret;
+		break;
+	}
+
+	case VIDIOC_STREAMOFF:
+	{
+		int *type = arg;
+
+		if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+			return -EINVAL;
+
+		if (!uvc_has_privileges(handle))
+			return -EBUSY;
+
+		return uvc_video_enable(video, 0);
+	}
+
+	/* Analog video standards make no sense for digital cameras. */
+	case VIDIOC_ENUMSTD:
+	case VIDIOC_QUERYSTD:
+	case VIDIOC_G_STD:
+	case VIDIOC_S_STD:
+
+	case VIDIOC_OVERLAY:
+
+	case VIDIOC_ENUMAUDIO:
+	case VIDIOC_ENUMAUDOUT:
+
+	case VIDIOC_ENUMOUTPUT:
+		uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
+		return -EINVAL;
+
+	/* Dynamic controls. */
+	case UVCIOC_CTRL_ADD:
+	{
+		struct uvc_xu_control_info *xinfo = arg;
+		struct uvc_control_info *info;
+
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+
+		info = kmalloc(sizeof *info, GFP_KERNEL);
+		if (info == NULL)
+			return -ENOMEM;
+
+		memcpy(info->entity, xinfo->entity, sizeof info->entity);
+		info->index = xinfo->index;
+		info->selector = xinfo->selector;
+		info->size = xinfo->size;
+		info->flags = xinfo->flags;
+
+		info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
+				UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF;
+
+		ret = uvc_ctrl_add_info(info);
+		if (ret < 0)
+			kfree(info);
+		break;
+	}
+
+	case UVCIOC_CTRL_MAP:
+	{
+		struct uvc_xu_control_mapping *xmap = arg;
+		struct uvc_control_mapping *map;
+
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+
+		map = kmalloc(sizeof *map, GFP_KERNEL);
+		if (map == NULL)
+			return -ENOMEM;
+
+		map->id = xmap->id;
+		memcpy(map->name, xmap->name, sizeof map->name);
+		memcpy(map->entity, xmap->entity, sizeof map->entity);
+		map->selector = xmap->selector;
+		map->size = xmap->size;
+		map->offset = xmap->offset;
+		map->v4l2_type = xmap->v4l2_type;
+		map->data_type = xmap->data_type;
+
+		ret = uvc_ctrl_add_mapping(map);
+		if (ret < 0)
+			kfree(map);
+		break;
+	}
+
+	case UVCIOC_CTRL_GET:
+		return uvc_xu_ctrl_query(video, arg, 0);
+
+	case UVCIOC_CTRL_SET:
+		return uvc_xu_ctrl_query(video, arg, 1);
+
+	default:
+		if ((ret = v4l_compat_translate_ioctl(inode, file, cmd, arg,
+			uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD)
+			uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n",
+				  cmd);
+		return ret;
+	}
+
+	return ret;
+}
+
+static int uvc_v4l2_ioctl(struct inode *inode, struct file *file,
+		     unsigned int cmd, unsigned long arg)
+{
+	uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_ioctl\n");
+	return video_usercopy(inode, file, cmd, arg, uvc_v4l2_do_ioctl);
+}
+
+static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
+		    size_t count, loff_t *ppos)
+{
+	uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
+	return -ENODEV;
+}
+
+/*
+ * VMA operations.
+ */
+static void uvc_vm_open(struct vm_area_struct *vma)
+{
+	struct uvc_buffer *buffer = vma->vm_private_data;
+	buffer->vma_use_count++;
+}
+
+static void uvc_vm_close(struct vm_area_struct *vma)
+{
+	struct uvc_buffer *buffer = vma->vm_private_data;
+	buffer->vma_use_count--;
+}
+
+static struct vm_operations_struct uvc_vm_ops = {
+	.open		= uvc_vm_open,
+	.close		= uvc_vm_close,
+};
+
+static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct uvc_video_device *video = video_get_drvdata(vdev);
+	struct uvc_buffer *buffer;
+	struct page *page;
+	unsigned long addr, start, size;
+	unsigned int i;
+	int ret = 0;
+
+	uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
+
+	start = vma->vm_start;
+	size = vma->vm_end - vma->vm_start;
+
+	mutex_lock(&video->queue.mutex);
+
+	for (i = 0; i < video->queue.count; ++i) {
+		buffer = &video->queue.buffer[i];
+		if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
+			break;
+	}
+
+	if (i == video->queue.count || size != video->queue.buf_size) {
+		ret = -EINVAL;
+		goto done;
+	}
+
+	/*
+	 * VM_IO marks the area as being an mmaped region for I/O to a
+	 * device. It also prevents the region from being core dumped.
+	 */
+	vma->vm_flags |= VM_IO;
+
+	addr = (unsigned long)video->queue.mem + buffer->buf.m.offset;
+	while (size > 0) {
+		page = vmalloc_to_page((void *)addr);
+		if ((ret = vm_insert_page(vma, start, page)) < 0)
+			goto done;
+
+		start += PAGE_SIZE;
+		addr += PAGE_SIZE;
+		size -= PAGE_SIZE;
+	}
+
+	vma->vm_ops = &uvc_vm_ops;
+	vma->vm_private_data = buffer;
+	uvc_vm_open(vma);
+
+done:
+	mutex_unlock(&video->queue.mutex);
+	return ret;
+}
+
+static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct uvc_video_device *video = video_get_drvdata(vdev);
+
+	uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
+
+	return uvc_queue_poll(&video->queue, file, wait);
+}
+
+struct file_operations uvc_fops = {
+	.owner		= THIS_MODULE,
+	.open		= uvc_v4l2_open,
+	.release	= uvc_v4l2_release,
+	.ioctl		= uvc_v4l2_ioctl,
+	.compat_ioctl	= v4l_compat_ioctl32,
+	.llseek		= no_llseek,
+	.read		= uvc_v4l2_read,
+	.mmap		= uvc_v4l2_mmap,
+	.poll		= uvc_v4l2_poll,
+};