366 lines
9.1 KiB
C
366 lines
9.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* uvc_v4l2.c -- USB Video Class Gadget driver
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*
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* Copyright (C) 2009-2010
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* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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*/
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/usb/g_uvc.h>
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#include <linux/videodev2.h>
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#include <linux/vmalloc.h>
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#include <linux/wait.h>
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#include <media/v4l2-dev.h>
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#include <media/v4l2-event.h>
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#include <media/v4l2-ioctl.h>
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#include "f_uvc.h"
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#include "uvc.h"
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#include "uvc_queue.h"
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#include "uvc_video.h"
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#include "uvc_v4l2.h"
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/* --------------------------------------------------------------------------
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* Requests handling
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*/
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static int
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uvc_send_response(struct uvc_device *uvc, struct uvc_request_data *data)
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{
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struct usb_composite_dev *cdev = uvc->func.config->cdev;
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struct usb_request *req = uvc->control_req;
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if (data->length < 0)
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return usb_ep_set_halt(cdev->gadget->ep0);
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req->length = min_t(unsigned int, uvc->event_length, data->length);
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req->zero = data->length < uvc->event_length;
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memcpy(req->buf, data->data, req->length);
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return usb_ep_queue(cdev->gadget->ep0, req, GFP_KERNEL);
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}
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/* --------------------------------------------------------------------------
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* V4L2 ioctls
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*/
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struct uvc_format {
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u8 bpp;
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u32 fcc;
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};
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static struct uvc_format uvc_formats[] = {
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{ 16, V4L2_PIX_FMT_YUYV },
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{ 0, V4L2_PIX_FMT_MJPEG },
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};
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static int
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uvc_v4l2_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
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{
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struct video_device *vdev = video_devdata(file);
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struct uvc_device *uvc = video_get_drvdata(vdev);
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struct usb_composite_dev *cdev = uvc->func.config->cdev;
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strlcpy(cap->driver, "g_uvc", sizeof(cap->driver));
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strlcpy(cap->card, cdev->gadget->name, sizeof(cap->card));
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strlcpy(cap->bus_info, dev_name(&cdev->gadget->dev),
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sizeof(cap->bus_info));
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cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
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cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
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return 0;
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}
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static int
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uvc_v4l2_get_format(struct file *file, void *fh, struct v4l2_format *fmt)
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{
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struct video_device *vdev = video_devdata(file);
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struct uvc_device *uvc = video_get_drvdata(vdev);
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struct uvc_video *video = &uvc->video;
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fmt->fmt.pix.pixelformat = video->fcc;
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fmt->fmt.pix.width = video->width;
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fmt->fmt.pix.height = video->height;
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fmt->fmt.pix.field = V4L2_FIELD_NONE;
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fmt->fmt.pix.bytesperline = video->bpp * video->width / 8;
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fmt->fmt.pix.sizeimage = video->imagesize;
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fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
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fmt->fmt.pix.priv = 0;
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return 0;
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}
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static int
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uvc_v4l2_set_format(struct file *file, void *fh, struct v4l2_format *fmt)
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{
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struct video_device *vdev = video_devdata(file);
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struct uvc_device *uvc = video_get_drvdata(vdev);
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struct uvc_video *video = &uvc->video;
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struct uvc_format *format;
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unsigned int imagesize;
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unsigned int bpl;
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(uvc_formats); ++i) {
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format = &uvc_formats[i];
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if (format->fcc == fmt->fmt.pix.pixelformat)
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break;
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}
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if (i == ARRAY_SIZE(uvc_formats)) {
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uvcg_info(&uvc->func, "Unsupported format 0x%08x.\n",
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fmt->fmt.pix.pixelformat);
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return -EINVAL;
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}
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bpl = format->bpp * fmt->fmt.pix.width / 8;
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imagesize = bpl ? bpl * fmt->fmt.pix.height : fmt->fmt.pix.sizeimage;
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video->fcc = format->fcc;
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video->bpp = format->bpp;
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video->width = fmt->fmt.pix.width;
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video->height = fmt->fmt.pix.height;
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video->imagesize = imagesize;
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fmt->fmt.pix.field = V4L2_FIELD_NONE;
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fmt->fmt.pix.bytesperline = bpl;
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fmt->fmt.pix.sizeimage = imagesize;
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fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
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fmt->fmt.pix.priv = 0;
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return 0;
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}
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static int
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uvc_v4l2_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *b)
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{
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struct video_device *vdev = video_devdata(file);
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struct uvc_device *uvc = video_get_drvdata(vdev);
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struct uvc_video *video = &uvc->video;
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if (b->type != video->queue.queue.type)
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return -EINVAL;
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return uvcg_alloc_buffers(&video->queue, b);
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}
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static int
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uvc_v4l2_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
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{
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struct video_device *vdev = video_devdata(file);
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struct uvc_device *uvc = video_get_drvdata(vdev);
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struct uvc_video *video = &uvc->video;
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return uvcg_query_buffer(&video->queue, b);
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}
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static int
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uvc_v4l2_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
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{
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struct video_device *vdev = video_devdata(file);
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struct uvc_device *uvc = video_get_drvdata(vdev);
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struct uvc_video *video = &uvc->video;
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int ret;
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ret = uvcg_queue_buffer(&video->queue, b);
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if (ret < 0)
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return ret;
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return uvcg_video_pump(video);
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}
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static int
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uvc_v4l2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
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{
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struct video_device *vdev = video_devdata(file);
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struct uvc_device *uvc = video_get_drvdata(vdev);
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struct uvc_video *video = &uvc->video;
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return uvcg_dequeue_buffer(&video->queue, b, file->f_flags & O_NONBLOCK);
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}
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static int
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uvc_v4l2_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
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{
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struct video_device *vdev = video_devdata(file);
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struct uvc_device *uvc = video_get_drvdata(vdev);
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struct uvc_video *video = &uvc->video;
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int ret;
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if (type != video->queue.queue.type)
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return -EINVAL;
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/* Enable UVC video. */
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ret = uvcg_video_enable(video, 1);
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if (ret < 0)
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return ret;
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/*
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* Complete the alternate setting selection setup phase now that
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* userspace is ready to provide video frames.
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*/
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uvc_function_setup_continue(uvc);
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uvc->state = UVC_STATE_STREAMING;
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return 0;
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}
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static int
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uvc_v4l2_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
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{
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struct video_device *vdev = video_devdata(file);
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struct uvc_device *uvc = video_get_drvdata(vdev);
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struct uvc_video *video = &uvc->video;
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if (type != video->queue.queue.type)
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return -EINVAL;
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return uvcg_video_enable(video, 0);
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}
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static int
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uvc_v4l2_subscribe_event(struct v4l2_fh *fh,
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const struct v4l2_event_subscription *sub)
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{
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if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST)
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return -EINVAL;
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return v4l2_event_subscribe(fh, sub, 2, NULL);
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}
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static int
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uvc_v4l2_unsubscribe_event(struct v4l2_fh *fh,
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const struct v4l2_event_subscription *sub)
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{
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return v4l2_event_unsubscribe(fh, sub);
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}
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static long
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uvc_v4l2_ioctl_default(struct file *file, void *fh, bool valid_prio,
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unsigned int cmd, void *arg)
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{
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struct video_device *vdev = video_devdata(file);
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struct uvc_device *uvc = video_get_drvdata(vdev);
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switch (cmd) {
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case UVCIOC_SEND_RESPONSE:
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return uvc_send_response(uvc, arg);
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default:
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return -ENOIOCTLCMD;
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}
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}
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const struct v4l2_ioctl_ops uvc_v4l2_ioctl_ops = {
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.vidioc_querycap = uvc_v4l2_querycap,
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.vidioc_g_fmt_vid_out = uvc_v4l2_get_format,
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.vidioc_s_fmt_vid_out = uvc_v4l2_set_format,
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.vidioc_reqbufs = uvc_v4l2_reqbufs,
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.vidioc_querybuf = uvc_v4l2_querybuf,
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.vidioc_qbuf = uvc_v4l2_qbuf,
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.vidioc_dqbuf = uvc_v4l2_dqbuf,
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.vidioc_streamon = uvc_v4l2_streamon,
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.vidioc_streamoff = uvc_v4l2_streamoff,
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.vidioc_subscribe_event = uvc_v4l2_subscribe_event,
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.vidioc_unsubscribe_event = uvc_v4l2_unsubscribe_event,
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.vidioc_default = uvc_v4l2_ioctl_default,
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};
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/* --------------------------------------------------------------------------
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* V4L2
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*/
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static int
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uvc_v4l2_open(struct file *file)
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{
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struct video_device *vdev = video_devdata(file);
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struct uvc_device *uvc = video_get_drvdata(vdev);
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struct uvc_file_handle *handle;
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handle = kzalloc(sizeof(*handle), GFP_KERNEL);
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if (handle == NULL)
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return -ENOMEM;
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v4l2_fh_init(&handle->vfh, vdev);
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v4l2_fh_add(&handle->vfh);
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handle->device = &uvc->video;
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file->private_data = &handle->vfh;
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uvc_function_connect(uvc);
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return 0;
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}
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static int
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uvc_v4l2_release(struct file *file)
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{
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struct video_device *vdev = video_devdata(file);
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struct uvc_device *uvc = video_get_drvdata(vdev);
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struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data);
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struct uvc_video *video = handle->device;
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uvc_function_disconnect(uvc);
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mutex_lock(&video->mutex);
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uvcg_video_enable(video, 0);
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uvcg_free_buffers(&video->queue);
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mutex_unlock(&video->mutex);
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file->private_data = NULL;
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v4l2_fh_del(&handle->vfh);
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v4l2_fh_exit(&handle->vfh);
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kfree(handle);
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return 0;
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}
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static int
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uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
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{
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struct video_device *vdev = video_devdata(file);
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struct uvc_device *uvc = video_get_drvdata(vdev);
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return uvcg_queue_mmap(&uvc->video.queue, vma);
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}
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static __poll_t
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uvc_v4l2_poll(struct file *file, poll_table *wait)
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{
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struct video_device *vdev = video_devdata(file);
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struct uvc_device *uvc = video_get_drvdata(vdev);
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return uvcg_queue_poll(&uvc->video.queue, file, wait);
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}
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#ifndef CONFIG_MMU
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static unsigned long uvcg_v4l2_get_unmapped_area(struct file *file,
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unsigned long addr, unsigned long len, unsigned long pgoff,
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unsigned long flags)
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{
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struct video_device *vdev = video_devdata(file);
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struct uvc_device *uvc = video_get_drvdata(vdev);
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return uvcg_queue_get_unmapped_area(&uvc->video.queue, pgoff);
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}
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#endif
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const struct v4l2_file_operations uvc_v4l2_fops = {
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.owner = THIS_MODULE,
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.open = uvc_v4l2_open,
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.release = uvc_v4l2_release,
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.unlocked_ioctl = video_ioctl2,
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.mmap = uvc_v4l2_mmap,
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.poll = uvc_v4l2_poll,
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#ifndef CONFIG_MMU
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.get_unmapped_area = uvcg_v4l2_get_unmapped_area,
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#endif
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};
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