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363 lines
9.0 KiB
363 lines
9.0 KiB
// 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 ([email protected]) |
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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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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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schedule_work(&video->pump); |
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return ret; |
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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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