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// SPDX-License-Identifier: GPL-2.0+
/*
* uvc_v4l2.c -- USB Video Class Gadget driver
*
* Copyright (C) 2009-2010
* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
*/
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/usb/g_uvc.h>
#include <linux/videodev2.h>
#include <linux/vmalloc.h>
#include <linux/wait.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-event.h>
#include <media/v4l2-ioctl.h>
#include "f_uvc.h"
#include "uvc.h"
#include "uvc_queue.h"
#include "uvc_video.h"
#include "uvc_v4l2.h"
/* --------------------------------------------------------------------------
* Requests handling
*/
static int
uvc_send_response(struct uvc_device *uvc, struct uvc_request_data *data)
{
struct usb_composite_dev *cdev = uvc->func.config->cdev;
struct usb_request *req = uvc->control_req;
if (data->length < 0)
return usb_ep_set_halt(cdev->gadget->ep0);
req->length = min_t(unsigned int, uvc->event_length, data->length);
req->zero = data->length < uvc->event_length;
memcpy(req->buf, data->data, req->length);
return usb_ep_queue(cdev->gadget->ep0, req, GFP_KERNEL);
}
/* --------------------------------------------------------------------------
* V4L2 ioctls
*/
struct uvc_format {
u8 bpp;
u32 fcc;
};
static struct uvc_format uvc_formats[] = {
{ 16, V4L2_PIX_FMT_YUYV },
{ 0, V4L2_PIX_FMT_MJPEG },
};
static int
uvc_v4l2_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
{
struct video_device *vdev = video_devdata(file);
struct uvc_device *uvc = video_get_drvdata(vdev);
struct usb_composite_dev *cdev = uvc->func.config->cdev;
strlcpy(cap->driver, "g_uvc", sizeof(cap->driver));
strlcpy(cap->card, cdev->gadget->name, sizeof(cap->card));
strlcpy(cap->bus_info, dev_name(&cdev->gadget->dev),
sizeof(cap->bus_info));
return 0;
}
static int
uvc_v4l2_get_format(struct file *file, void *fh, struct v4l2_format *fmt)
{
struct video_device *vdev = video_devdata(file);
struct uvc_device *uvc = video_get_drvdata(vdev);
struct uvc_video *video = &uvc->video;
fmt->fmt.pix.pixelformat = video->fcc;
fmt->fmt.pix.width = video->width;
fmt->fmt.pix.height = video->height;
fmt->fmt.pix.field = V4L2_FIELD_NONE;
fmt->fmt.pix.bytesperline = video->bpp * video->width / 8;
fmt->fmt.pix.sizeimage = video->imagesize;
fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
fmt->fmt.pix.priv = 0;
return 0;
}
static int
uvc_v4l2_set_format(struct file *file, void *fh, struct v4l2_format *fmt)
{
struct video_device *vdev = video_devdata(file);
struct uvc_device *uvc = video_get_drvdata(vdev);
struct uvc_video *video = &uvc->video;
struct uvc_format *format;
unsigned int imagesize;
unsigned int bpl;
unsigned int i;
for (i = 0; i < ARRAY_SIZE(uvc_formats); ++i) {
format = &uvc_formats[i];
if (format->fcc == fmt->fmt.pix.pixelformat)
break;
}
if (i == ARRAY_SIZE(uvc_formats)) {
uvcg_info(&uvc->func, "Unsupported format 0x%08x.\n",
fmt->fmt.pix.pixelformat);
return -EINVAL;
}
bpl = format->bpp * fmt->fmt.pix.width / 8;
imagesize = bpl ? bpl * fmt->fmt.pix.height : fmt->fmt.pix.sizeimage;
video->fcc = format->fcc;
video->bpp = format->bpp;
video->width = fmt->fmt.pix.width;
video->height = fmt->fmt.pix.height;
video->imagesize = imagesize;
fmt->fmt.pix.field = V4L2_FIELD_NONE;
fmt->fmt.pix.bytesperline = bpl;
fmt->fmt.pix.sizeimage = imagesize;
fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
fmt->fmt.pix.priv = 0;
return 0;
}
static int
uvc_v4l2_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *b)
{
struct video_device *vdev = video_devdata(file);
struct uvc_device *uvc = video_get_drvdata(vdev);
struct uvc_video *video = &uvc->video;
if (b->type != video->queue.queue.type)
return -EINVAL;
return uvcg_alloc_buffers(&video->queue, b);
}
static int
uvc_v4l2_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
{
struct video_device *vdev = video_devdata(file);
struct uvc_device *uvc = video_get_drvdata(vdev);
struct uvc_video *video = &uvc->video;
return uvcg_query_buffer(&video->queue, b);
}
static int
uvc_v4l2_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
{
struct video_device *vdev = video_devdata(file);
struct uvc_device *uvc = video_get_drvdata(vdev);
struct uvc_video *video = &uvc->video;
int ret;
ret = uvcg_queue_buffer(&video->queue, b);
if (ret < 0)
return ret;
if (uvc->state == UVC_STATE_STREAMING)
schedule_work(&video->pump);
return ret;
}
static int
uvc_v4l2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
{
struct video_device *vdev = video_devdata(file);
struct uvc_device *uvc = video_get_drvdata(vdev);
struct uvc_video *video = &uvc->video;
return uvcg_dequeue_buffer(&video->queue, b, file->f_flags & O_NONBLOCK);
}
static int
uvc_v4l2_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
{
struct video_device *vdev = video_devdata(file);
struct uvc_device *uvc = video_get_drvdata(vdev);
struct uvc_video *video = &uvc->video;
int ret;
if (type != video->queue.queue.type)
return -EINVAL;
/* Enable UVC video. */
ret = uvcg_video_enable(video, 1);
if (ret < 0)
return ret;
/*
* Complete the alternate setting selection setup phase now that
* userspace is ready to provide video frames.
*/
uvc_function_setup_continue(uvc);
uvc->state = UVC_STATE_STREAMING;
return 0;
}
static int
uvc_v4l2_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
{
struct video_device *vdev = video_devdata(file);
struct uvc_device *uvc = video_get_drvdata(vdev);
struct uvc_video *video = &uvc->video;
if (type != video->queue.queue.type)
return -EINVAL;
return uvcg_video_enable(video, 0);
}
static int
uvc_v4l2_subscribe_event(struct v4l2_fh *fh,
const struct v4l2_event_subscription *sub)
{
struct uvc_device *uvc = video_get_drvdata(fh->vdev);
struct uvc_file_handle *handle = to_uvc_file_handle(fh);
int ret;
if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST)
return -EINVAL;
if (sub->type == UVC_EVENT_SETUP && uvc->func_connected)
return -EBUSY;
ret = v4l2_event_subscribe(fh, sub, 2, NULL);
if (ret < 0)
return ret;
if (sub->type == UVC_EVENT_SETUP) {
uvc->func_connected = true;
handle->is_uvc_app_handle = true;
uvc_function_connect(uvc);
}
return 0;
}
static void uvc_v4l2_disable(struct uvc_device *uvc)
{
uvc->func_connected = false;
uvc_function_disconnect(uvc);
uvcg_video_enable(&uvc->video, 0);
uvcg_free_buffers(&uvc->video.queue);
}
static int
uvc_v4l2_unsubscribe_event(struct v4l2_fh *fh,
const struct v4l2_event_subscription *sub)
{
struct uvc_device *uvc = video_get_drvdata(fh->vdev);
struct uvc_file_handle *handle = to_uvc_file_handle(fh);
int ret;
ret = v4l2_event_unsubscribe(fh, sub);
if (ret < 0)
return ret;
if (sub->type == UVC_EVENT_SETUP && handle->is_uvc_app_handle) {
uvc_v4l2_disable(uvc);
handle->is_uvc_app_handle = false;
}
return 0;
}
static long
uvc_v4l2_ioctl_default(struct file *file, void *fh, bool valid_prio,
unsigned int cmd, void *arg)
{
struct video_device *vdev = video_devdata(file);
struct uvc_device *uvc = video_get_drvdata(vdev);
switch (cmd) {
case UVCIOC_SEND_RESPONSE:
return uvc_send_response(uvc, arg);
default:
return -ENOIOCTLCMD;
}
}
const struct v4l2_ioctl_ops uvc_v4l2_ioctl_ops = {
.vidioc_querycap = uvc_v4l2_querycap,
.vidioc_g_fmt_vid_out = uvc_v4l2_get_format,
.vidioc_s_fmt_vid_out = uvc_v4l2_set_format,
.vidioc_reqbufs = uvc_v4l2_reqbufs,
.vidioc_querybuf = uvc_v4l2_querybuf,
.vidioc_qbuf = uvc_v4l2_qbuf,
.vidioc_dqbuf = uvc_v4l2_dqbuf,
.vidioc_streamon = uvc_v4l2_streamon,
.vidioc_streamoff = uvc_v4l2_streamoff,
.vidioc_subscribe_event = uvc_v4l2_subscribe_event,
.vidioc_unsubscribe_event = uvc_v4l2_unsubscribe_event,
.vidioc_default = uvc_v4l2_ioctl_default,
};
/* --------------------------------------------------------------------------
* V4L2
*/
static int
uvc_v4l2_open(struct file *file)
{
struct video_device *vdev = video_devdata(file);
struct uvc_device *uvc = video_get_drvdata(vdev);
struct uvc_file_handle *handle;
handle = kzalloc(sizeof(*handle), GFP_KERNEL);
if (handle == NULL)
return -ENOMEM;
v4l2_fh_init(&handle->vfh, vdev);
v4l2_fh_add(&handle->vfh);
handle->device = &uvc->video;
file->private_data = &handle->vfh;
return 0;
}
static int
uvc_v4l2_release(struct file *file)
{
struct video_device *vdev = video_devdata(file);
struct uvc_device *uvc = video_get_drvdata(vdev);
struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data);
struct uvc_video *video = handle->device;
mutex_lock(&video->mutex);
if (handle->is_uvc_app_handle)
uvc_v4l2_disable(uvc);
mutex_unlock(&video->mutex);
file->private_data = NULL;
v4l2_fh_del(&handle->vfh);
v4l2_fh_exit(&handle->vfh);
kfree(handle);
return 0;
}
static int
uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
{
struct video_device *vdev = video_devdata(file);
struct uvc_device *uvc = video_get_drvdata(vdev);
return uvcg_queue_mmap(&uvc->video.queue, vma);
}
static __poll_t
uvc_v4l2_poll(struct file *file, poll_table *wait)
{
struct video_device *vdev = video_devdata(file);
struct uvc_device *uvc = video_get_drvdata(vdev);
return uvcg_queue_poll(&uvc->video.queue, file, wait);
}
#ifndef CONFIG_MMU
static unsigned long uvcg_v4l2_get_unmapped_area(struct file *file,
unsigned long addr, unsigned long len, unsigned long pgoff,
unsigned long flags)
{
struct video_device *vdev = video_devdata(file);
struct uvc_device *uvc = video_get_drvdata(vdev);
return uvcg_queue_get_unmapped_area(&uvc->video.queue, pgoff);
}
#endif
const struct v4l2_file_operations uvc_v4l2_fops = {
.owner = THIS_MODULE,
.open = uvc_v4l2_open,
.release = uvc_v4l2_release,
.unlocked_ioctl = video_ioctl2,
.mmap = uvc_v4l2_mmap,
.poll = uvc_v4l2_poll,
#ifndef CONFIG_MMU
.get_unmapped_area = uvcg_v4l2_get_unmapped_area,
#endif
};