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OpenCloudOS-Kernel/drivers/media/usb/uvc/uvc_v4l2.c

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/*
* uvc_v4l2.c -- USB Video Class driver - V4L2 API
*
* Copyright (C) 2005-2010
* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
*
* 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/compat.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/videodev2.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/wait.h>
#include <linux/atomic.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include <media/v4l2-ioctl.h>
#include "uvcvideo.h"
/* ------------------------------------------------------------------------
* UVC ioctls
*/
static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain,
struct uvc_xu_control_mapping *xmap)
{
struct uvc_control_mapping *map;
unsigned int size;
int ret;
map = kzalloc(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;
switch (xmap->v4l2_type) {
case V4L2_CTRL_TYPE_INTEGER:
case V4L2_CTRL_TYPE_BOOLEAN:
case V4L2_CTRL_TYPE_BUTTON:
break;
case V4L2_CTRL_TYPE_MENU:
/* Prevent excessive memory consumption, as well as integer
* overflows.
*/
if (xmap->menu_count == 0 ||
xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES) {
ret = -EINVAL;
goto free_map;
}
size = xmap->menu_count * sizeof(*map->menu_info);
map->menu_info = memdup_user(xmap->menu_info, size);
if (IS_ERR(map->menu_info)) {
ret = PTR_ERR(map->menu_info);
goto free_map;
}
map->menu_count = xmap->menu_count;
break;
default:
uvc_trace(UVC_TRACE_CONTROL, "Unsupported V4L2 control type "
"%u.\n", xmap->v4l2_type);
ret = -ENOTTY;
goto free_map;
}
ret = uvc_ctrl_add_mapping(chain, map);
kfree(map->menu_info);
free_map:
kfree(map);
return ret;
}
/* ------------------------------------------------------------------------
* V4L2 interface
*/
/*
* 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 u32 uvc_v4l2_get_bytesperline(const struct uvc_format *format,
const struct uvc_frame *frame)
{
switch (format->fcc) {
case V4L2_PIX_FMT_NV12:
case V4L2_PIX_FMT_YVU420:
case V4L2_PIX_FMT_YUV420:
case V4L2_PIX_FMT_M420:
return frame->wWidth;
default:
return format->bpp * frame->wWidth / 8;
}
}
static int uvc_v4l2_try_format(struct uvc_streaming *stream,
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 != stream->type)
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, use the default
* format otherwise.
*/
for (i = 0; i < stream->nformats; ++i) {
format = &stream->format[i];
if (format->fcc == fmt->fmt.pix.pixelformat)
break;
}
if (i == stream->nformats) {
format = stream->def_format;
fmt->fmt.pix.pixelformat = format->fcc;
}
/* 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).
*/
mutex_lock(&stream->mutex);
if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
probe->dwMaxVideoFrameSize =
stream->ctrl.dwMaxVideoFrameSize;
/* Probe the device. */
ret = uvc_probe_video(stream, probe);
mutex_unlock(&stream->mutex);
if (ret < 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 = uvc_v4l2_get_bytesperline(format, frame);
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_streaming *stream,
struct v4l2_format *fmt)
{
struct uvc_format *format;
struct uvc_frame *frame;
int ret = 0;
if (fmt->type != stream->type)
return -EINVAL;
mutex_lock(&stream->mutex);
format = stream->cur_format;
frame = stream->cur_frame;
if (format == NULL || frame == NULL) {
ret = -EINVAL;
goto done;
}
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 = uvc_v4l2_get_bytesperline(format, frame);
fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
fmt->fmt.pix.colorspace = format->colorspace;
fmt->fmt.pix.priv = 0;
done:
mutex_unlock(&stream->mutex);
return ret;
}
static int uvc_v4l2_set_format(struct uvc_streaming *stream,
struct v4l2_format *fmt)
{
struct uvc_streaming_control probe;
struct uvc_format *format;
struct uvc_frame *frame;
int ret;
if (fmt->type != stream->type)
return -EINVAL;
ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
if (ret < 0)
return ret;
mutex_lock(&stream->mutex);
if (uvc_queue_allocated(&stream->queue)) {
ret = -EBUSY;
goto done;
}
stream->ctrl = probe;
stream->cur_format = format;
stream->cur_frame = frame;
done:
mutex_unlock(&stream->mutex);
return ret;
}
static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
struct v4l2_streamparm *parm)
{
u32 numerator, denominator;
if (parm->type != stream->type)
return -EINVAL;
mutex_lock(&stream->mutex);
numerator = stream->ctrl.dwFrameInterval;
mutex_unlock(&stream->mutex);
denominator = 10000000;
uvc_simplify_fraction(&numerator, &denominator, 8, 333);
memset(parm, 0, sizeof(*parm));
parm->type = stream->type;
if (stream->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;
} else {
parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
parm->parm.output.outputmode = 0;
parm->parm.output.timeperframe.numerator = numerator;
parm->parm.output.timeperframe.denominator = denominator;
}
return 0;
}
static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
struct v4l2_streamparm *parm)
{
struct uvc_streaming_control probe;
struct v4l2_fract timeperframe;
struct uvc_format *format;
struct uvc_frame *frame;
u32 interval, maxd;
unsigned int i;
int ret;
if (parm->type != stream->type)
return -EINVAL;
if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
timeperframe = parm->parm.capture.timeperframe;
else
timeperframe = parm->parm.output.timeperframe;
interval = uvc_fraction_to_interval(timeperframe.numerator,
timeperframe.denominator);
uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
timeperframe.numerator, timeperframe.denominator, interval);
mutex_lock(&stream->mutex);
if (uvc_queue_streaming(&stream->queue)) {
mutex_unlock(&stream->mutex);
return -EBUSY;
}
format = stream->cur_format;
frame = stream->cur_frame;
probe = stream->ctrl;
probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
maxd = abs((s32)probe.dwFrameInterval - interval);
/* Try frames with matching size to find the best frame interval. */
for (i = 0; i < format->nframes && maxd != 0; i++) {
u32 d, ival;
if (&format->frame[i] == stream->cur_frame)
continue;
if (format->frame[i].wWidth != stream->cur_frame->wWidth ||
format->frame[i].wHeight != stream->cur_frame->wHeight)
continue;
ival = uvc_try_frame_interval(&format->frame[i], interval);
d = abs((s32)ival - interval);
if (d >= maxd)
continue;
frame = &format->frame[i];
probe.bFrameIndex = frame->bFrameIndex;
probe.dwFrameInterval = ival;
maxd = d;
}
/* Probe the device with the new settings. */
ret = uvc_probe_video(stream, &probe);
if (ret < 0) {
mutex_unlock(&stream->mutex);
return ret;
}
stream->ctrl = probe;
stream->cur_frame = frame;
mutex_unlock(&stream->mutex);
/* Return the actual frame period. */
timeperframe.numerator = probe.dwFrameInterval;
timeperframe.denominator = 10000000;
uvc_simplify_fraction(&timeperframe.numerator,
&timeperframe.denominator, 8, 333);
if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
parm->parm.capture.timeperframe = timeperframe;
else
parm->parm.output.timeperframe = timeperframe;
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 that requires privileges will
* automatically acquire the required privileges if possible, or return -EBUSY
* otherwise. Privileges are dismissed when closing the instance or when
* freeing the video buffers using VIDIOC_REQBUFS.
*
* Operations that require privileges are:
*
* - VIDIOC_S_INPUT
* - VIDIOC_S_PARM
* - VIDIOC_S_FMT
* - VIDIOC_REQBUFS
*/
static int uvc_acquire_privileges(struct uvc_fh *handle)
{
/* 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. */
if (atomic_inc_return(&handle->stream->active) != 1) {
atomic_dec(&handle->stream->active);
return -EBUSY;
}
handle->state = UVC_HANDLE_ACTIVE;
return 0;
}
static void uvc_dismiss_privileges(struct uvc_fh *handle)
{
if (handle->state == UVC_HANDLE_ACTIVE)
atomic_dec(&handle->stream->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 file *file)
{
struct uvc_streaming *stream;
struct uvc_fh *handle;
int ret = 0;
uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
stream = video_drvdata(file);
ret = usb_autopm_get_interface(stream->dev->intf);
if (ret < 0)
return ret;
/* Create the device handle. */
handle = kzalloc(sizeof(*handle), GFP_KERNEL);
if (handle == NULL) {
usb_autopm_put_interface(stream->dev->intf);
return -ENOMEM;
}
mutex_lock(&stream->dev->lock);
if (stream->dev->users == 0) {
ret = uvc_status_start(stream->dev, GFP_KERNEL);
if (ret < 0) {
mutex_unlock(&stream->dev->lock);
usb_autopm_put_interface(stream->dev->intf);
kfree(handle);
return ret;
}
}
stream->dev->users++;
mutex_unlock(&stream->dev->lock);
v4l2_fh_init(&handle->vfh, &stream->vdev);
v4l2_fh_add(&handle->vfh);
handle->chain = stream->chain;
handle->stream = stream;
handle->state = UVC_HANDLE_PASSIVE;
file->private_data = handle;
return 0;
}
static int uvc_v4l2_release(struct file *file)
{
struct uvc_fh *handle = file->private_data;
struct uvc_streaming *stream = handle->stream;
uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
/* Only free resources if this is a privileged handle. */
if (uvc_has_privileges(handle))
uvc_queue_release(&stream->queue);
/* Release the file handle. */
uvc_dismiss_privileges(handle);
v4l2_fh_del(&handle->vfh);
v4l2_fh_exit(&handle->vfh);
kfree(handle);
file->private_data = NULL;
mutex_lock(&stream->dev->lock);
if (--stream->dev->users == 0)
uvc_status_stop(stream->dev);
mutex_unlock(&stream->dev->lock);
usb_autopm_put_interface(stream->dev->intf);
return 0;
}
static int uvc_ioctl_querycap(struct file *file, void *fh,
struct v4l2_capability *cap)
{
struct video_device *vdev = video_devdata(file);
struct uvc_fh *handle = file->private_data;
struct uvc_video_chain *chain = handle->chain;
struct uvc_streaming *stream = handle->stream;
strscpy(cap->driver, "uvcvideo", sizeof(cap->driver));
strscpy(cap->card, vdev->name, sizeof(cap->card));
usb_make_path(stream->dev->udev, cap->bus_info, sizeof(cap->bus_info));
cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
| chain->caps;
return 0;
}
static int uvc_ioctl_enum_fmt(struct uvc_streaming *stream,
struct v4l2_fmtdesc *fmt)
{
struct uvc_format *format;
enum v4l2_buf_type type = fmt->type;
u32 index = fmt->index;
if (fmt->type != stream->type || fmt->index >= stream->nformats)
return -EINVAL;
memset(fmt, 0, sizeof(*fmt));
fmt->index = index;
fmt->type = type;
format = &stream->format[fmt->index];
fmt->flags = 0;
if (format->flags & UVC_FMT_FLAG_COMPRESSED)
fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
strscpy(fmt->description, format->name, sizeof(fmt->description));
fmt->description[sizeof(fmt->description) - 1] = 0;
fmt->pixelformat = format->fcc;
return 0;
}
static int uvc_ioctl_enum_fmt_vid_cap(struct file *file, void *fh,
struct v4l2_fmtdesc *fmt)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
return uvc_ioctl_enum_fmt(stream, fmt);
}
static int uvc_ioctl_enum_fmt_vid_out(struct file *file, void *fh,
struct v4l2_fmtdesc *fmt)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
return uvc_ioctl_enum_fmt(stream, fmt);
}
static int uvc_ioctl_g_fmt_vid_cap(struct file *file, void *fh,
struct v4l2_format *fmt)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
return uvc_v4l2_get_format(stream, fmt);
}
static int uvc_ioctl_g_fmt_vid_out(struct file *file, void *fh,
struct v4l2_format *fmt)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
return uvc_v4l2_get_format(stream, fmt);
}
static int uvc_ioctl_s_fmt_vid_cap(struct file *file, void *fh,
struct v4l2_format *fmt)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
int ret;
ret = uvc_acquire_privileges(handle);
if (ret < 0)
return ret;
return uvc_v4l2_set_format(stream, fmt);
}
static int uvc_ioctl_s_fmt_vid_out(struct file *file, void *fh,
struct v4l2_format *fmt)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
int ret;
ret = uvc_acquire_privileges(handle);
if (ret < 0)
return ret;
return uvc_v4l2_set_format(stream, fmt);
}
static int uvc_ioctl_try_fmt_vid_cap(struct file *file, void *fh,
struct v4l2_format *fmt)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
struct uvc_streaming_control probe;
return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
}
static int uvc_ioctl_try_fmt_vid_out(struct file *file, void *fh,
struct v4l2_format *fmt)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
struct uvc_streaming_control probe;
return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
}
static int uvc_ioctl_reqbufs(struct file *file, void *fh,
struct v4l2_requestbuffers *rb)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
int ret;
ret = uvc_acquire_privileges(handle);
if (ret < 0)
return ret;
mutex_lock(&stream->mutex);
ret = uvc_request_buffers(&stream->queue, rb);
mutex_unlock(&stream->mutex);
if (ret < 0)
return ret;
if (ret == 0)
uvc_dismiss_privileges(handle);
return 0;
}
static int uvc_ioctl_querybuf(struct file *file, void *fh,
struct v4l2_buffer *buf)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
if (!uvc_has_privileges(handle))
return -EBUSY;
return uvc_query_buffer(&stream->queue, buf);
}
static int uvc_ioctl_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
if (!uvc_has_privileges(handle))
return -EBUSY;
return uvc_queue_buffer(&stream->queue, buf);
}
static int uvc_ioctl_expbuf(struct file *file, void *fh,
struct v4l2_exportbuffer *exp)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
if (!uvc_has_privileges(handle))
return -EBUSY;
return uvc_export_buffer(&stream->queue, exp);
}
static int uvc_ioctl_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
if (!uvc_has_privileges(handle))
return -EBUSY;
return uvc_dequeue_buffer(&stream->queue, buf,
file->f_flags & O_NONBLOCK);
}
static int uvc_ioctl_create_bufs(struct file *file, void *fh,
struct v4l2_create_buffers *cb)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
int ret;
ret = uvc_acquire_privileges(handle);
if (ret < 0)
return ret;
return uvc_create_buffers(&stream->queue, cb);
}
static int uvc_ioctl_streamon(struct file *file, void *fh,
enum v4l2_buf_type type)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
int ret;
if (!uvc_has_privileges(handle))
return -EBUSY;
mutex_lock(&stream->mutex);
ret = uvc_queue_streamon(&stream->queue, type);
mutex_unlock(&stream->mutex);
return ret;
}
static int uvc_ioctl_streamoff(struct file *file, void *fh,
enum v4l2_buf_type type)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
if (!uvc_has_privileges(handle))
return -EBUSY;
mutex_lock(&stream->mutex);
uvc_queue_streamoff(&stream->queue, type);
mutex_unlock(&stream->mutex);
return 0;
}
static int uvc_ioctl_enum_input(struct file *file, void *fh,
struct v4l2_input *input)
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
const struct uvc_entity *selector = chain->selector;
struct uvc_entity *iterm = NULL;
u32 index = input->index;
int pin = 0;
if (selector == NULL ||
(chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
if (index != 0)
return -EINVAL;
list_for_each_entry(iterm, &chain->entities, chain) {
if (UVC_ENTITY_IS_ITERM(iterm))
break;
}
pin = iterm->id;
} else if (index < selector->bNrInPins) {
pin = selector->baSourceID[index];
list_for_each_entry(iterm, &chain->entities, chain) {
if (!UVC_ENTITY_IS_ITERM(iterm))
continue;
if (iterm->id == pin)
break;
}
}
if (iterm == NULL || iterm->id != pin)
return -EINVAL;
memset(input, 0, sizeof(*input));
input->index = index;
strscpy(input->name, iterm->name, sizeof(input->name));
if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
input->type = V4L2_INPUT_TYPE_CAMERA;
return 0;
}
static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input)
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
int ret;
u8 i;
if (chain->selector == NULL ||
(chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
*input = 0;
return 0;
}
ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, chain->selector->id,
chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL,
&i, 1);
if (ret < 0)
return ret;
*input = i - 1;
return 0;
}
static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input)
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
int ret;
u32 i;
ret = uvc_acquire_privileges(handle);
if (ret < 0)
return ret;
if (chain->selector == NULL ||
(chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
if (input)
return -EINVAL;
return 0;
}
if (input >= chain->selector->bNrInPins)
return -EINVAL;
i = input + 1;
return uvc_query_ctrl(chain->dev, UVC_SET_CUR, chain->selector->id,
chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL,
&i, 1);
}
static int uvc_ioctl_queryctrl(struct file *file, void *fh,
struct v4l2_queryctrl *qc)
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
return uvc_query_v4l2_ctrl(chain, qc);
}
static int uvc_ioctl_query_ext_ctrl(struct file *file, void *fh,
struct v4l2_query_ext_ctrl *qec)
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
struct v4l2_queryctrl qc = { qec->id };
int ret;
ret = uvc_query_v4l2_ctrl(chain, &qc);
if (ret)
return ret;
qec->id = qc.id;
qec->type = qc.type;
strscpy(qec->name, qc.name, sizeof(qec->name));
qec->minimum = qc.minimum;
qec->maximum = qc.maximum;
qec->step = qc.step;
qec->default_value = qc.default_value;
qec->flags = qc.flags;
qec->elem_size = 4;
qec->elems = 1;
qec->nr_of_dims = 0;
memset(qec->dims, 0, sizeof(qec->dims));
memset(qec->reserved, 0, sizeof(qec->reserved));
return 0;
}
static int uvc_ioctl_g_ctrl(struct file *file, void *fh,
struct v4l2_control *ctrl)
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
struct v4l2_ext_control xctrl;
int ret;
memset(&xctrl, 0, sizeof(xctrl));
xctrl.id = ctrl->id;
ret = uvc_ctrl_begin(chain);
if (ret < 0)
return ret;
ret = uvc_ctrl_get(chain, &xctrl);
uvc_ctrl_rollback(handle);
if (ret < 0)
return ret;
ctrl->value = xctrl.value;
return 0;
}
static int uvc_ioctl_s_ctrl(struct file *file, void *fh,
struct v4l2_control *ctrl)
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
struct v4l2_ext_control xctrl;
int ret;
memset(&xctrl, 0, sizeof(xctrl));
xctrl.id = ctrl->id;
xctrl.value = ctrl->value;
ret = uvc_ctrl_begin(chain);
if (ret < 0)
return ret;
ret = uvc_ctrl_set(handle, &xctrl);
if (ret < 0) {
uvc_ctrl_rollback(handle);
return ret;
}
ret = uvc_ctrl_commit(handle, &xctrl, 1);
if (ret < 0)
return ret;
ctrl->value = xctrl.value;
return 0;
}
static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
struct v4l2_ext_controls *ctrls)
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
struct v4l2_ext_control *ctrl = ctrls->controls;
unsigned int i;
int ret;
if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) {
for (i = 0; i < ctrls->count; ++ctrl, ++i) {
struct v4l2_queryctrl qc = { .id = ctrl->id };
ret = uvc_query_v4l2_ctrl(chain, &qc);
if (ret < 0) {
ctrls->error_idx = i;
return ret;
}
ctrl->value = qc.default_value;
}
return 0;
}
ret = uvc_ctrl_begin(chain);
if (ret < 0)
return ret;
for (i = 0; i < ctrls->count; ++ctrl, ++i) {
ret = uvc_ctrl_get(chain, ctrl);
if (ret < 0) {
uvc_ctrl_rollback(handle);
ctrls->error_idx = i;
return ret;
}
}
ctrls->error_idx = 0;
return uvc_ctrl_rollback(handle);
}
static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
struct v4l2_ext_controls *ctrls,
bool commit)
{
struct v4l2_ext_control *ctrl = ctrls->controls;
struct uvc_video_chain *chain = handle->chain;
unsigned int i;
int ret;
/* Default value cannot be changed */
if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL)
return -EINVAL;
ret = uvc_ctrl_begin(chain);
if (ret < 0)
return ret;
for (i = 0; i < ctrls->count; ++ctrl, ++i) {
ret = uvc_ctrl_set(handle, ctrl);
if (ret < 0) {
uvc_ctrl_rollback(handle);
ctrls->error_idx = commit ? ctrls->count : i;
return ret;
}
}
ctrls->error_idx = 0;
if (commit)
return uvc_ctrl_commit(handle, ctrls->controls, ctrls->count);
else
return uvc_ctrl_rollback(handle);
}
static int uvc_ioctl_s_ext_ctrls(struct file *file, void *fh,
struct v4l2_ext_controls *ctrls)
{
struct uvc_fh *handle = fh;
return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, true);
}
static int uvc_ioctl_try_ext_ctrls(struct file *file, void *fh,
struct v4l2_ext_controls *ctrls)
{
struct uvc_fh *handle = fh;
return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, false);
}
static int uvc_ioctl_querymenu(struct file *file, void *fh,
struct v4l2_querymenu *qm)
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
return uvc_query_v4l2_menu(chain, qm);
}
static int uvc_ioctl_g_selection(struct file *file, void *fh,
struct v4l2_selection *sel)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
if (sel->type != stream->type)
return -EINVAL;
switch (sel->target) {
case V4L2_SEL_TGT_CROP_DEFAULT:
case V4L2_SEL_TGT_CROP_BOUNDS:
if (stream->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
break;
case V4L2_SEL_TGT_COMPOSE_DEFAULT:
case V4L2_SEL_TGT_COMPOSE_BOUNDS:
if (stream->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
return -EINVAL;
break;
default:
return -EINVAL;
}
sel->r.left = 0;
sel->r.top = 0;
mutex_lock(&stream->mutex);
sel->r.width = stream->cur_frame->wWidth;
sel->r.height = stream->cur_frame->wHeight;
mutex_unlock(&stream->mutex);
return 0;
}
static int uvc_ioctl_g_parm(struct file *file, void *fh,
struct v4l2_streamparm *parm)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
return uvc_v4l2_get_streamparm(stream, parm);
}
static int uvc_ioctl_s_parm(struct file *file, void *fh,
struct v4l2_streamparm *parm)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
int ret;
ret = uvc_acquire_privileges(handle);
if (ret < 0)
return ret;
return uvc_v4l2_set_streamparm(stream, parm);
}
static int uvc_ioctl_enum_framesizes(struct file *file, void *fh,
struct v4l2_frmsizeenum *fsize)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
struct uvc_format *format = NULL;
struct uvc_frame *frame = NULL;
unsigned int index;
unsigned int i;
/* Look for the given pixel format */
for (i = 0; i < stream->nformats; i++) {
if (stream->format[i].fcc == fsize->pixel_format) {
format = &stream->format[i];
break;
}
}
if (format == NULL)
return -EINVAL;
/* Skip duplicate frame sizes */
for (i = 0, index = 0; i < format->nframes; i++) {
if (frame && frame->wWidth == format->frame[i].wWidth &&
frame->wHeight == format->frame[i].wHeight)
continue;
frame = &format->frame[i];
if (index == fsize->index)
break;
index++;
}
if (i == format->nframes)
return -EINVAL;
fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
fsize->discrete.width = frame->wWidth;
fsize->discrete.height = frame->wHeight;
return 0;
}
static int uvc_ioctl_enum_frameintervals(struct file *file, void *fh,
struct v4l2_frmivalenum *fival)
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
struct uvc_format *format = NULL;
struct uvc_frame *frame = NULL;
unsigned int nintervals;
unsigned int index;
unsigned int i;
/* Look for the given pixel format and frame size */
for (i = 0; i < stream->nformats; i++) {
if (stream->format[i].fcc == fival->pixel_format) {
format = &stream->format[i];
break;
}
}
if (format == NULL)
return -EINVAL;
index = fival->index;
for (i = 0; i < format->nframes; i++) {
if (format->frame[i].wWidth == fival->width &&
format->frame[i].wHeight == fival->height) {
frame = &format->frame[i];
nintervals = frame->bFrameIntervalType ?: 1;
if (index < nintervals)
break;
index -= nintervals;
}
}
if (i == format->nframes)
return -EINVAL;
if (frame->bFrameIntervalType) {
fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
fival->discrete.numerator =
frame->dwFrameInterval[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);
}
return 0;
}
static int uvc_ioctl_subscribe_event(struct v4l2_fh *fh,
const struct v4l2_event_subscription *sub)
{
switch (sub->type) {
case V4L2_EVENT_CTRL:
return v4l2_event_subscribe(fh, sub, 0, &uvc_ctrl_sub_ev_ops);
default:
return -EINVAL;
}
}
static long uvc_ioctl_default(struct file *file, void *fh, bool valid_prio,
unsigned int cmd, void *arg)
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
switch (cmd) {
/* Dynamic controls. */
case UVCIOC_CTRL_MAP:
return uvc_ioctl_ctrl_map(chain, arg);
case UVCIOC_CTRL_QUERY:
return uvc_xu_ctrl_query(chain, arg);
default:
return -ENOTTY;
}
}
#ifdef CONFIG_COMPAT
struct uvc_xu_control_mapping32 {
u32 id;
u8 name[32];
u8 entity[16];
u8 selector;
u8 size;
u8 offset;
u32 v4l2_type;
u32 data_type;
compat_caddr_t menu_info;
u32 menu_count;
u32 reserved[4];
};
static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp,
const struct uvc_xu_control_mapping32 __user *up)
{
struct uvc_xu_control_mapping32 *p = (void *)kp;
compat_caddr_t info;
u32 count;
if (copy_from_user(p, up, sizeof(*p)))
return -EFAULT;
count = p->menu_count;
info = p->menu_info;
memset(kp->reserved, 0, sizeof(kp->reserved));
kp->menu_info = count ? compat_ptr(info) : NULL;
kp->menu_count = count;
return 0;
}
static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
struct uvc_xu_control_mapping32 __user *up)
{
if (copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
put_user(kp->menu_count, &up->menu_count))
return -EFAULT;
if (clear_user(up->reserved, sizeof(up->reserved)))
return -EFAULT;
return 0;
}
struct uvc_xu_control_query32 {
u8 unit;
u8 selector;
u8 query;
u16 size;
compat_caddr_t data;
};
static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
const struct uvc_xu_control_query32 __user *up)
{
struct uvc_xu_control_query32 v;
if (copy_from_user(&v, up, sizeof(v)))
return -EFAULT;
*kp = (struct uvc_xu_control_query){
.unit = v.unit,
.selector = v.selector,
.query = v.query,
.size = v.size,
.data = v.size ? compat_ptr(v.data) : NULL
};
return 0;
}
static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
struct uvc_xu_control_query32 __user *up)
{
if (copy_to_user(up, kp, offsetof(typeof(*up), data)))
return -EFAULT;
return 0;
}
#define UVCIOC_CTRL_MAP32 _IOWR('u', 0x20, struct uvc_xu_control_mapping32)
#define UVCIOC_CTRL_QUERY32 _IOWR('u', 0x21, struct uvc_xu_control_query32)
static long uvc_v4l2_compat_ioctl32(struct file *file,
unsigned int cmd, unsigned long arg)
{
struct uvc_fh *handle = file->private_data;
union {
struct uvc_xu_control_mapping xmap;
struct uvc_xu_control_query xqry;
} karg;
void __user *up = compat_ptr(arg);
long ret;
switch (cmd) {
case UVCIOC_CTRL_MAP32:
ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
if (ret)
return ret;
ret = uvc_ioctl_ctrl_map(handle->chain, &karg.xmap);
if (ret)
return ret;
ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up);
if (ret)
return ret;
break;
case UVCIOC_CTRL_QUERY32:
ret = uvc_v4l2_get_xu_query(&karg.xqry, up);
if (ret)
return ret;
ret = uvc_xu_ctrl_query(handle->chain, &karg.xqry);
if (ret)
return ret;
ret = uvc_v4l2_put_xu_query(&karg.xqry, up);
if (ret)
return ret;
break;
default:
return -ENOIOCTLCMD;
}
return ret;
}
#endif
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 -EINVAL;
}
static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
{
struct uvc_fh *handle = file->private_data;
struct uvc_streaming *stream = handle->stream;
uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
return uvc_queue_mmap(&stream->queue, vma);
}
static __poll_t uvc_v4l2_poll(struct file *file, poll_table *wait)
{
struct uvc_fh *handle = file->private_data;
struct uvc_streaming *stream = handle->stream;
uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
return uvc_queue_poll(&stream->queue, file, wait);
}
#ifndef CONFIG_MMU
static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
unsigned long addr, unsigned long len, unsigned long pgoff,
unsigned long flags)
{
struct uvc_fh *handle = file->private_data;
struct uvc_streaming *stream = handle->stream;
uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
}
#endif
const struct v4l2_ioctl_ops uvc_ioctl_ops = {
.vidioc_querycap = uvc_ioctl_querycap,
.vidioc_enum_fmt_vid_cap = uvc_ioctl_enum_fmt_vid_cap,
.vidioc_enum_fmt_vid_out = uvc_ioctl_enum_fmt_vid_out,
.vidioc_g_fmt_vid_cap = uvc_ioctl_g_fmt_vid_cap,
.vidioc_g_fmt_vid_out = uvc_ioctl_g_fmt_vid_out,
.vidioc_s_fmt_vid_cap = uvc_ioctl_s_fmt_vid_cap,
.vidioc_s_fmt_vid_out = uvc_ioctl_s_fmt_vid_out,
.vidioc_try_fmt_vid_cap = uvc_ioctl_try_fmt_vid_cap,
.vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt_vid_out,
.vidioc_reqbufs = uvc_ioctl_reqbufs,
.vidioc_querybuf = uvc_ioctl_querybuf,
.vidioc_qbuf = uvc_ioctl_qbuf,
.vidioc_expbuf = uvc_ioctl_expbuf,
.vidioc_dqbuf = uvc_ioctl_dqbuf,
.vidioc_create_bufs = uvc_ioctl_create_bufs,
.vidioc_streamon = uvc_ioctl_streamon,
.vidioc_streamoff = uvc_ioctl_streamoff,
.vidioc_enum_input = uvc_ioctl_enum_input,
.vidioc_g_input = uvc_ioctl_g_input,
.vidioc_s_input = uvc_ioctl_s_input,
.vidioc_queryctrl = uvc_ioctl_queryctrl,
.vidioc_query_ext_ctrl = uvc_ioctl_query_ext_ctrl,
.vidioc_g_ctrl = uvc_ioctl_g_ctrl,
.vidioc_s_ctrl = uvc_ioctl_s_ctrl,
.vidioc_g_ext_ctrls = uvc_ioctl_g_ext_ctrls,
.vidioc_s_ext_ctrls = uvc_ioctl_s_ext_ctrls,
.vidioc_try_ext_ctrls = uvc_ioctl_try_ext_ctrls,
.vidioc_querymenu = uvc_ioctl_querymenu,
.vidioc_g_selection = uvc_ioctl_g_selection,
.vidioc_g_parm = uvc_ioctl_g_parm,
.vidioc_s_parm = uvc_ioctl_s_parm,
.vidioc_enum_framesizes = uvc_ioctl_enum_framesizes,
.vidioc_enum_frameintervals = uvc_ioctl_enum_frameintervals,
.vidioc_subscribe_event = uvc_ioctl_subscribe_event,
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
.vidioc_default = uvc_ioctl_default,
};
const struct v4l2_file_operations uvc_fops = {
.owner = THIS_MODULE,
.open = uvc_v4l2_open,
.release = uvc_v4l2_release,
.unlocked_ioctl = video_ioctl2,
#ifdef CONFIG_COMPAT
.compat_ioctl32 = uvc_v4l2_compat_ioctl32,
#endif
.read = uvc_v4l2_read,
.mmap = uvc_v4l2_mmap,
.poll = uvc_v4l2_poll,
#ifndef CONFIG_MMU
.get_unmapped_area = uvc_v4l2_get_unmapped_area,
#endif
};
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