657 lines
16 KiB
C
657 lines
16 KiB
C
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// 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/usb/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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#include "uvc_configfs.h"
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static const struct uvc_format_desc *to_uvc_format(struct uvcg_format *uformat)
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{
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char guid[16] = UVC_GUID_FORMAT_MJPEG;
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const struct uvc_format_desc *format;
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struct uvcg_uncompressed *unc;
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if (uformat->type == UVCG_UNCOMPRESSED) {
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unc = to_uvcg_uncompressed(&uformat->group.cg_item);
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if (!unc)
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return ERR_PTR(-EINVAL);
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memcpy(guid, unc->desc.guidFormat, sizeof(guid));
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}
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format = uvc_format_by_guid(guid);
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if (!format)
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return ERR_PTR(-EINVAL);
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return format;
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}
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static int uvc_v4l2_get_bytesperline(struct uvcg_format *uformat,
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struct uvcg_frame *uframe)
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{
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struct uvcg_uncompressed *u;
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if (uformat->type == UVCG_UNCOMPRESSED) {
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u = to_uvcg_uncompressed(&uformat->group.cg_item);
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if (!u)
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return 0;
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return u->desc.bBitsPerPixel * uframe->frame.w_width / 8;
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}
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return 0;
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}
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static int uvc_get_frame_size(struct uvcg_format *uformat,
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struct uvcg_frame *uframe)
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{
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unsigned int bpl = uvc_v4l2_get_bytesperline(uformat, uframe);
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return bpl ? bpl * uframe->frame.w_height :
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uframe->frame.dw_max_video_frame_buffer_size;
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}
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static struct uvcg_format *find_format_by_index(struct uvc_device *uvc, int index)
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{
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struct uvcg_format_ptr *format;
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struct uvcg_format *uformat = NULL;
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int i = 1;
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list_for_each_entry(format, &uvc->header->formats, entry) {
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if (index == i) {
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uformat = format->fmt;
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break;
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}
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i++;
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}
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return uformat;
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}
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static struct uvcg_frame *find_frame_by_index(struct uvc_device *uvc,
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struct uvcg_format *uformat,
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int index)
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{
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struct uvcg_format_ptr *format;
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struct uvcg_frame_ptr *frame;
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struct uvcg_frame *uframe = NULL;
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list_for_each_entry(format, &uvc->header->formats, entry) {
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if (format->fmt->type != uformat->type)
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continue;
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list_for_each_entry(frame, &format->fmt->frames, entry) {
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if (index == frame->frm->frame.b_frame_index) {
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uframe = frame->frm;
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break;
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}
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}
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}
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return uframe;
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}
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static struct uvcg_format *find_format_by_pix(struct uvc_device *uvc,
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u32 pixelformat)
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{
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struct uvcg_format_ptr *format;
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struct uvcg_format *uformat = NULL;
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list_for_each_entry(format, &uvc->header->formats, entry) {
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const struct uvc_format_desc *fmtdesc = to_uvc_format(format->fmt);
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if (fmtdesc->fcc == pixelformat) {
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uformat = format->fmt;
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break;
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}
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}
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return uformat;
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}
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static struct uvcg_frame *find_closest_frame_by_size(struct uvc_device *uvc,
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struct uvcg_format *uformat,
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u16 rw, u16 rh)
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{
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struct uvc_video *video = &uvc->video;
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struct uvcg_format_ptr *format;
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struct uvcg_frame_ptr *frame;
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struct uvcg_frame *uframe = NULL;
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unsigned int d, maxd;
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/* Find the closest image size. The distance between image sizes is
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* the size in pixels of the non-overlapping regions between the
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* requested size and the frame-specified size.
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*/
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maxd = (unsigned int)-1;
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list_for_each_entry(format, &uvc->header->formats, entry) {
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if (format->fmt->type != uformat->type)
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continue;
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list_for_each_entry(frame, &format->fmt->frames, entry) {
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u16 w, h;
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w = frame->frm->frame.w_width;
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h = frame->frm->frame.w_height;
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d = min(w, rw) * min(h, rh);
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d = w*h + rw*rh - 2*d;
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if (d < maxd) {
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maxd = d;
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uframe = frame->frm;
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}
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if (maxd == 0)
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break;
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}
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}
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if (!uframe)
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uvcg_dbg(&video->uvc->func, "Unsupported size %ux%u\n", rw, rh);
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return uframe;
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}
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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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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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strscpy(cap->driver, "g_uvc", sizeof(cap->driver));
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strscpy(cap->card, cdev->gadget->name, sizeof(cap->card));
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strscpy(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_try_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 uvcg_format *uformat;
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struct uvcg_frame *uframe;
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u8 *fcc;
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if (fmt->type != video->queue.queue.type)
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return -EINVAL;
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fcc = (u8 *)&fmt->fmt.pix.pixelformat;
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uvcg_dbg(&uvc->func, "Trying format 0x%08x (%c%c%c%c): %ux%u\n",
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fmt->fmt.pix.pixelformat,
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fcc[0], fcc[1], fcc[2], fcc[3],
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fmt->fmt.pix.width, fmt->fmt.pix.height);
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uformat = find_format_by_pix(uvc, fmt->fmt.pix.pixelformat);
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if (!uformat)
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return -EINVAL;
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uframe = find_closest_frame_by_size(uvc, uformat,
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fmt->fmt.pix.width, fmt->fmt.pix.height);
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if (!uframe)
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return -EINVAL;
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fmt->fmt.pix.width = uframe->frame.w_width;
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fmt->fmt.pix.height = uframe->frame.w_height;
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fmt->fmt.pix.field = V4L2_FIELD_NONE;
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fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(uformat, uframe);
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fmt->fmt.pix.sizeimage = uvc_get_frame_size(uformat, uframe);
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fmt->fmt.pix.pixelformat = to_uvc_format(uformat)->fcc;
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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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int ret;
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ret = uvc_v4l2_try_format(file, fh, fmt);
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if (ret)
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return ret;
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video->fcc = fmt->fmt.pix.pixelformat;
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video->bpp = fmt->fmt.pix.bytesperline * 8 / video->width;
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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 = fmt->fmt.pix.sizeimage;
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return ret;
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}
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static int
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uvc_v4l2_enum_frameintervals(struct file *file, void *fh,
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struct v4l2_frmivalenum *fival)
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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 uvcg_format *uformat = NULL;
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struct uvcg_frame *uframe = NULL;
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struct uvcg_frame_ptr *frame;
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uformat = find_format_by_pix(uvc, fival->pixel_format);
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if (!uformat)
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return -EINVAL;
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list_for_each_entry(frame, &uformat->frames, entry) {
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if (frame->frm->frame.w_width == fival->width &&
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frame->frm->frame.w_height == fival->height) {
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uframe = frame->frm;
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break;
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}
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}
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if (!uframe)
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return -EINVAL;
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if (fival->index >= uframe->frame.b_frame_interval_type)
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return -EINVAL;
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fival->discrete.numerator =
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uframe->dw_frame_interval[fival->index];
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/* TODO: handle V4L2_FRMIVAL_TYPE_STEPWISE */
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fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
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fival->discrete.denominator = 10000000;
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v4l2_simplify_fraction(&fival->discrete.numerator,
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&fival->discrete.denominator, 8, 333);
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return 0;
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}
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static int
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uvc_v4l2_enum_framesizes(struct file *file, void *fh,
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struct v4l2_frmsizeenum *fsize)
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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 uvcg_format *uformat = NULL;
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struct uvcg_frame *uframe = NULL;
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uformat = find_format_by_pix(uvc, fsize->pixel_format);
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if (!uformat)
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return -EINVAL;
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if (fsize->index >= uformat->num_frames)
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return -EINVAL;
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uframe = find_frame_by_index(uvc, uformat, fsize->index + 1);
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if (!uframe)
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return -EINVAL;
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fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
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fsize->discrete.width = uframe->frame.w_width;
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fsize->discrete.height = uframe->frame.w_height;
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return 0;
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}
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static int
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uvc_v4l2_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
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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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const struct uvc_format_desc *fmtdesc;
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struct uvcg_format *uformat;
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if (f->index >= uvc->header->num_fmt)
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return -EINVAL;
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uformat = find_format_by_index(uvc, f->index + 1);
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if (!uformat)
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return -EINVAL;
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fmtdesc = to_uvc_format(uformat);
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f->pixelformat = fmtdesc->fcc;
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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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if (uvc->state == UVC_STATE_STREAMING)
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queue_work(video->async_wq, &video->pump);
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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);
|
||
|
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, 0);
|
||
|
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;
|
||
|
int ret = 0;
|
||
|
|
||
|
if (type != video->queue.queue.type)
|
||
|
return -EINVAL;
|
||
|
|
||
|
ret = uvcg_video_disable(video);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
uvc->state = UVC_STATE_CONNECTED;
|
||
|
uvc_function_setup_continue(uvc, 1);
|
||
|
return 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_function_disconnect(uvc);
|
||
|
uvcg_video_disable(&uvc->video);
|
||
|
uvcg_free_buffers(&uvc->video.queue);
|
||
|
uvc->func_connected = false;
|
||
|
wake_up_interruptible(&uvc->func_connected_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_try_fmt_vid_out = uvc_v4l2_try_format,
|
||
|
.vidioc_g_fmt_vid_out = uvc_v4l2_get_format,
|
||
|
.vidioc_s_fmt_vid_out = uvc_v4l2_set_format,
|
||
|
.vidioc_enum_frameintervals = uvc_v4l2_enum_frameintervals,
|
||
|
.vidioc_enum_framesizes = uvc_v4l2_enum_framesizes,
|
||
|
.vidioc_enum_fmt_vid_out = uvc_v4l2_enum_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
|
||
|
};
|