547 lines
13 KiB
C
547 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* uvc_video.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/kernel.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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#include <linux/usb/video.h>
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#include <asm/unaligned.h>
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#include <media/v4l2-dev.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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/* --------------------------------------------------------------------------
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* Video codecs
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*/
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static int
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uvc_video_encode_header(struct uvc_video *video, struct uvc_buffer *buf,
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u8 *data, int len)
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{
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struct uvc_device *uvc = container_of(video, struct uvc_device, video);
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struct usb_composite_dev *cdev = uvc->func.config->cdev;
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struct timespec64 ts = ns_to_timespec64(buf->buf.vb2_buf.timestamp);
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int pos = 2;
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data[1] = UVC_STREAM_EOH | video->fid;
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if (video->queue.buf_used == 0 && ts.tv_sec) {
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/* dwClockFrequency is 48 MHz */
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u32 pts = ((u64)ts.tv_sec * USEC_PER_SEC + ts.tv_nsec / NSEC_PER_USEC) * 48;
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data[1] |= UVC_STREAM_PTS;
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put_unaligned_le32(pts, &data[pos]);
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pos += 4;
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}
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if (cdev->gadget->ops->get_frame) {
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u32 sof, stc;
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sof = usb_gadget_frame_number(cdev->gadget);
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ktime_get_ts64(&ts);
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stc = ((u64)ts.tv_sec * USEC_PER_SEC + ts.tv_nsec / NSEC_PER_USEC) * 48;
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data[1] |= UVC_STREAM_SCR;
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put_unaligned_le32(stc, &data[pos]);
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put_unaligned_le16(sof, &data[pos+4]);
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pos += 6;
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}
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data[0] = pos;
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if (buf->bytesused - video->queue.buf_used <= len - pos)
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data[1] |= UVC_STREAM_EOF;
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return pos;
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}
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static int
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uvc_video_encode_data(struct uvc_video *video, struct uvc_buffer *buf,
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u8 *data, int len)
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{
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struct uvc_video_queue *queue = &video->queue;
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unsigned int nbytes;
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void *mem;
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/* Copy video data to the USB buffer. */
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mem = buf->mem + queue->buf_used;
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nbytes = min((unsigned int)len, buf->bytesused - queue->buf_used);
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memcpy(data, mem, nbytes);
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queue->buf_used += nbytes;
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return nbytes;
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}
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static void
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uvc_video_encode_bulk(struct usb_request *req, struct uvc_video *video,
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struct uvc_buffer *buf)
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{
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void *mem = req->buf;
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struct uvc_request *ureq = req->context;
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int len = video->req_size;
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int ret;
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/* Add a header at the beginning of the payload. */
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if (video->payload_size == 0) {
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ret = uvc_video_encode_header(video, buf, mem, len);
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video->payload_size += ret;
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mem += ret;
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len -= ret;
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}
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/* Process video data. */
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len = min((int)(video->max_payload_size - video->payload_size), len);
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ret = uvc_video_encode_data(video, buf, mem, len);
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video->payload_size += ret;
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len -= ret;
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req->length = video->req_size - len;
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req->zero = video->payload_size == video->max_payload_size;
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if (buf->bytesused == video->queue.buf_used) {
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video->queue.buf_used = 0;
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buf->state = UVC_BUF_STATE_DONE;
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list_del(&buf->queue);
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video->fid ^= UVC_STREAM_FID;
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ureq->last_buf = buf;
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video->payload_size = 0;
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}
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if (video->payload_size == video->max_payload_size ||
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video->queue.flags & UVC_QUEUE_DROP_INCOMPLETE ||
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buf->bytesused == video->queue.buf_used)
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video->payload_size = 0;
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}
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static void
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uvc_video_encode_isoc_sg(struct usb_request *req, struct uvc_video *video,
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struct uvc_buffer *buf)
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{
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unsigned int pending = buf->bytesused - video->queue.buf_used;
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struct uvc_request *ureq = req->context;
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struct scatterlist *sg, *iter;
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unsigned int len = video->req_size;
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unsigned int sg_left, part = 0;
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unsigned int i;
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int header_len;
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sg = ureq->sgt.sgl;
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sg_init_table(sg, ureq->sgt.nents);
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/* Init the header. */
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header_len = uvc_video_encode_header(video, buf, ureq->header,
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video->req_size);
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sg_set_buf(sg, ureq->header, header_len);
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len -= header_len;
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if (pending <= len)
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len = pending;
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req->length = (len == pending) ?
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len + header_len : video->req_size;
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/* Init the pending sgs with payload */
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sg = sg_next(sg);
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for_each_sg(sg, iter, ureq->sgt.nents - 1, i) {
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if (!len || !buf->sg || !buf->sg->length)
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break;
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sg_left = buf->sg->length - buf->offset;
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part = min_t(unsigned int, len, sg_left);
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sg_set_page(iter, sg_page(buf->sg), part, buf->offset);
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if (part == sg_left) {
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buf->offset = 0;
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buf->sg = sg_next(buf->sg);
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} else {
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buf->offset += part;
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}
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len -= part;
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}
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/* Assign the video data with header. */
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req->buf = NULL;
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req->sg = ureq->sgt.sgl;
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req->num_sgs = i + 1;
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req->length -= len;
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video->queue.buf_used += req->length - header_len;
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if (buf->bytesused == video->queue.buf_used || !buf->sg ||
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video->queue.flags & UVC_QUEUE_DROP_INCOMPLETE) {
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video->queue.buf_used = 0;
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buf->state = UVC_BUF_STATE_DONE;
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buf->offset = 0;
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list_del(&buf->queue);
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video->fid ^= UVC_STREAM_FID;
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ureq->last_buf = buf;
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}
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}
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static void
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uvc_video_encode_isoc(struct usb_request *req, struct uvc_video *video,
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struct uvc_buffer *buf)
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{
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void *mem = req->buf;
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struct uvc_request *ureq = req->context;
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int len = video->req_size;
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int ret;
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/* Add the header. */
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ret = uvc_video_encode_header(video, buf, mem, len);
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mem += ret;
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len -= ret;
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/* Process video data. */
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ret = uvc_video_encode_data(video, buf, mem, len);
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len -= ret;
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req->length = video->req_size - len;
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if (buf->bytesused == video->queue.buf_used ||
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video->queue.flags & UVC_QUEUE_DROP_INCOMPLETE) {
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video->queue.buf_used = 0;
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buf->state = UVC_BUF_STATE_DONE;
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list_del(&buf->queue);
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video->fid ^= UVC_STREAM_FID;
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ureq->last_buf = buf;
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}
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}
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/* --------------------------------------------------------------------------
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* Request handling
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*/
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static int uvcg_video_ep_queue(struct uvc_video *video, struct usb_request *req)
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{
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int ret;
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ret = usb_ep_queue(video->ep, req, GFP_ATOMIC);
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if (ret < 0) {
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uvcg_err(&video->uvc->func, "Failed to queue request (%d).\n",
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ret);
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/* If the endpoint is disabled the descriptor may be NULL. */
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if (video->ep->desc) {
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/* Isochronous endpoints can't be halted. */
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if (usb_endpoint_xfer_bulk(video->ep->desc))
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usb_ep_set_halt(video->ep);
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}
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}
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return ret;
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}
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static void
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uvc_video_complete(struct usb_ep *ep, struct usb_request *req)
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{
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struct uvc_request *ureq = req->context;
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struct uvc_video *video = ureq->video;
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struct uvc_video_queue *queue = &video->queue;
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struct uvc_device *uvc = video->uvc;
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unsigned long flags;
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switch (req->status) {
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case 0:
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break;
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case -EXDEV:
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uvcg_dbg(&video->uvc->func, "VS request missed xfer.\n");
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queue->flags |= UVC_QUEUE_DROP_INCOMPLETE;
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break;
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case -ESHUTDOWN: /* disconnect from host. */
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uvcg_dbg(&video->uvc->func, "VS request cancelled.\n");
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uvcg_queue_cancel(queue, 1);
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break;
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default:
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uvcg_warn(&video->uvc->func,
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"VS request completed with status %d.\n",
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req->status);
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uvcg_queue_cancel(queue, 0);
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}
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if (ureq->last_buf) {
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uvcg_complete_buffer(&video->queue, ureq->last_buf);
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ureq->last_buf = NULL;
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}
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spin_lock_irqsave(&video->req_lock, flags);
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list_add_tail(&req->list, &video->req_free);
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spin_unlock_irqrestore(&video->req_lock, flags);
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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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}
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static int
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uvc_video_free_requests(struct uvc_video *video)
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{
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unsigned int i;
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if (video->ureq) {
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for (i = 0; i < video->uvc_num_requests; ++i) {
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sg_free_table(&video->ureq[i].sgt);
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if (video->ureq[i].req) {
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usb_ep_free_request(video->ep, video->ureq[i].req);
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video->ureq[i].req = NULL;
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}
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if (video->ureq[i].req_buffer) {
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kfree(video->ureq[i].req_buffer);
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video->ureq[i].req_buffer = NULL;
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}
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}
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kfree(video->ureq);
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video->ureq = NULL;
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}
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INIT_LIST_HEAD(&video->req_free);
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video->req_size = 0;
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return 0;
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}
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static int
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uvc_video_alloc_requests(struct uvc_video *video)
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{
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unsigned int req_size;
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unsigned int i;
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int ret = -ENOMEM;
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BUG_ON(video->req_size);
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req_size = video->ep->maxpacket
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* max_t(unsigned int, video->ep->maxburst, 1)
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* (video->ep->mult);
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video->ureq = kcalloc(video->uvc_num_requests, sizeof(struct uvc_request), GFP_KERNEL);
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if (video->ureq == NULL)
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return -ENOMEM;
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for (i = 0; i < video->uvc_num_requests; ++i) {
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video->ureq[i].req_buffer = kmalloc(req_size, GFP_KERNEL);
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if (video->ureq[i].req_buffer == NULL)
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goto error;
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video->ureq[i].req = usb_ep_alloc_request(video->ep, GFP_KERNEL);
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if (video->ureq[i].req == NULL)
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goto error;
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video->ureq[i].req->buf = video->ureq[i].req_buffer;
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video->ureq[i].req->length = 0;
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video->ureq[i].req->complete = uvc_video_complete;
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video->ureq[i].req->context = &video->ureq[i];
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video->ureq[i].video = video;
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video->ureq[i].last_buf = NULL;
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list_add_tail(&video->ureq[i].req->list, &video->req_free);
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/* req_size/PAGE_SIZE + 1 for overruns and + 1 for header */
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sg_alloc_table(&video->ureq[i].sgt,
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DIV_ROUND_UP(req_size - UVCG_REQUEST_HEADER_LEN,
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PAGE_SIZE) + 2, GFP_KERNEL);
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}
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video->req_size = req_size;
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return 0;
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error:
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uvc_video_free_requests(video);
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return ret;
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}
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/* --------------------------------------------------------------------------
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* Video streaming
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*/
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/*
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* uvcg_video_pump - Pump video data into the USB requests
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*
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* This function fills the available USB requests (listed in req_free) with
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* video data from the queued buffers.
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*/
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static void uvcg_video_pump(struct work_struct *work)
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{
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struct uvc_video *video = container_of(work, struct uvc_video, pump);
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struct uvc_video_queue *queue = &video->queue;
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struct usb_request *req = NULL;
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struct uvc_buffer *buf;
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unsigned long flags;
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int ret;
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bool buf_int;
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/* video->max_payload_size is only set when using bulk transfer */
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bool is_bulk = video->max_payload_size;
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while (video->ep->enabled) {
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/*
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* Retrieve the first available USB request, protected by the
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* request lock.
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*/
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spin_lock_irqsave(&video->req_lock, flags);
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if (list_empty(&video->req_free)) {
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spin_unlock_irqrestore(&video->req_lock, flags);
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return;
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}
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req = list_first_entry(&video->req_free, struct usb_request,
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list);
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list_del(&req->list);
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spin_unlock_irqrestore(&video->req_lock, flags);
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/*
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* Retrieve the first available video buffer and fill the
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* request, protected by the video queue irqlock.
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*/
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spin_lock_irqsave(&queue->irqlock, flags);
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buf = uvcg_queue_head(queue);
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if (buf != NULL) {
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video->encode(req, video, buf);
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/* Always interrupt for the last request of a video buffer */
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buf_int = buf->state == UVC_BUF_STATE_DONE;
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} else if (!(queue->flags & UVC_QUEUE_DISCONNECTED) && !is_bulk) {
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/*
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* No video buffer available; the queue is still connected and
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* we're traferring over ISOC. Queue a 0 length request to
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* prevent missed ISOC transfers.
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*/
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req->length = 0;
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buf_int = false;
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} else {
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/*
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* Either queue has been disconnected or no video buffer
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* available to bulk transfer. Either way, stop processing
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* further.
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*/
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spin_unlock_irqrestore(&queue->irqlock, flags);
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break;
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}
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/*
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* With usb3 we have more requests. This will decrease the
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* interrupt load to a quarter but also catches the corner
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* cases, which needs to be handled.
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*/
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if (list_empty(&video->req_free) || buf_int ||
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!(video->req_int_count %
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DIV_ROUND_UP(video->uvc_num_requests, 4))) {
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video->req_int_count = 0;
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req->no_interrupt = 0;
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} else {
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req->no_interrupt = 1;
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}
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/* Queue the USB request */
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ret = uvcg_video_ep_queue(video, req);
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spin_unlock_irqrestore(&queue->irqlock, flags);
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if (ret < 0) {
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uvcg_queue_cancel(queue, 0);
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break;
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}
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/* Endpoint now owns the request */
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req = NULL;
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video->req_int_count++;
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}
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if (!req)
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return;
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spin_lock_irqsave(&video->req_lock, flags);
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list_add_tail(&req->list, &video->req_free);
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spin_unlock_irqrestore(&video->req_lock, flags);
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return;
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}
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/*
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* Enable or disable the video stream.
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*/
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int uvcg_video_enable(struct uvc_video *video, int enable)
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{
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unsigned int i;
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int ret;
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if (video->ep == NULL) {
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uvcg_info(&video->uvc->func,
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"Video enable failed, device is uninitialized.\n");
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return -ENODEV;
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}
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if (!enable) {
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cancel_work_sync(&video->pump);
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uvcg_queue_cancel(&video->queue, 0);
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for (i = 0; i < video->uvc_num_requests; ++i)
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if (video->ureq && video->ureq[i].req)
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usb_ep_dequeue(video->ep, video->ureq[i].req);
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uvc_video_free_requests(video);
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uvcg_queue_enable(&video->queue, 0);
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return 0;
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}
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if ((ret = uvcg_queue_enable(&video->queue, 1)) < 0)
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return ret;
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if ((ret = uvc_video_alloc_requests(video)) < 0)
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return ret;
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if (video->max_payload_size) {
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video->encode = uvc_video_encode_bulk;
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video->payload_size = 0;
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} else
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video->encode = video->queue.use_sg ?
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uvc_video_encode_isoc_sg : uvc_video_encode_isoc;
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video->req_int_count = 0;
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queue_work(video->async_wq, &video->pump);
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return ret;
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}
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/*
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* Initialize the UVC video stream.
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*/
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int uvcg_video_init(struct uvc_video *video, struct uvc_device *uvc)
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{
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INIT_LIST_HEAD(&video->req_free);
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spin_lock_init(&video->req_lock);
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|
INIT_WORK(&video->pump, uvcg_video_pump);
|
|
|
|
/* Allocate a work queue for asynchronous video pump handler. */
|
|
video->async_wq = alloc_workqueue("uvcgadget", WQ_UNBOUND | WQ_HIGHPRI, 0);
|
|
if (!video->async_wq)
|
|
return -EINVAL;
|
|
|
|
video->uvc = uvc;
|
|
video->fcc = V4L2_PIX_FMT_YUYV;
|
|
video->bpp = 16;
|
|
video->width = 320;
|
|
video->height = 240;
|
|
video->imagesize = 320 * 240 * 2;
|
|
|
|
/* Initialize the video buffers queue. */
|
|
uvcg_queue_init(&video->queue, uvc->v4l2_dev.dev->parent,
|
|
V4L2_BUF_TYPE_VIDEO_OUTPUT, &video->mutex);
|
|
return 0;
|
|
}
|