/* * UVC protocol handling * * Copyright (C) 2010 Ideas on board SPRL * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., */ #include #include #include #include #include #include #include #include #include "configfs.h" #include "stream.h" #include "tools.h" #include "uvc.h" #include "v4l2.h" struct uvc_device *uvc_open(const char *devname) { struct uvc_device *dev; dev = malloc(sizeof *dev); if (dev == NULL) return NULL; memset(dev, 0, sizeof *dev); dev->vdev = v4l2_open(devname); if (dev->vdev == NULL) { free(dev); return NULL; } return dev; } void uvc_close(struct uvc_device *dev) { v4l2_close(dev->vdev); dev->vdev = NULL; free(dev); } /* --------------------------------------------------------------------------- * Request processing */ static void uvc_fill_streaming_control(struct uvc_device *dev, struct uvc_streaming_control *ctrl, int iformat, int iframe, unsigned int ival) { const struct uvc_function_config_format *format; const struct uvc_function_config_frame *frame; unsigned int i; /* * Restrict the iformat, iframe and ival to valid values. Negative * values for iformat or iframe will result in the maximum valid value * being selected. */ iformat = clamp((unsigned int)iformat, 1U, dev->fc->streaming.num_formats); format = &dev->fc->streaming.formats[iformat-1]; iframe = clamp((unsigned int)iframe, 1U, format->num_frames); frame = &format->frames[iframe-1]; for (i = 0; i < frame->num_intervals; ++i) { if (ival <= frame->intervals[i]) { ival = frame->intervals[i]; break; } } if (i == frame->num_intervals) ival = frame->intervals[frame->num_intervals-1]; memset(ctrl, 0, sizeof *ctrl); ctrl->bmHint = 1; ctrl->bFormatIndex = iformat; ctrl->bFrameIndex = iframe ; ctrl->dwFrameInterval = ival; switch (format->fcc) { case V4L2_PIX_FMT_YUYV: ctrl->dwMaxVideoFrameSize = frame->width * frame->height * 2; break; case V4L2_PIX_FMT_MJPEG: ctrl->dwMaxVideoFrameSize = dev->maxsize; break; } ctrl->dwMaxPayloadTransferSize = dev->fc->streaming.ep.wMaxPacketSize; ctrl->bmFramingInfo = 3; ctrl->bPreferedVersion = 1; ctrl->bMaxVersion = 1; } static void uvc_events_process_standard(struct uvc_device *dev, const struct usb_ctrlrequest *ctrl, struct uvc_request_data *resp) { printf("standard request\n"); (void)dev; (void)ctrl; (void)resp; } static void uvc_events_process_control(struct uvc_device *dev, uint8_t req, uint8_t cs, struct uvc_request_data *resp) { printf("control request (req %02x cs %02x)\n", req, cs); (void)dev; (void)resp; } static void uvc_events_process_streaming(struct uvc_device *dev, uint8_t req, uint8_t cs, struct uvc_request_data *resp) { struct uvc_streaming_control *ctrl; printf("streaming request (req %02x cs %02x)\n", req, cs); if (cs != UVC_VS_PROBE_CONTROL && cs != UVC_VS_COMMIT_CONTROL) return; ctrl = (struct uvc_streaming_control *)&resp->data; resp->length = sizeof *ctrl; switch (req) { case UVC_SET_CUR: dev->control = cs; resp->length = 34; break; case UVC_GET_CUR: if (cs == UVC_VS_PROBE_CONTROL) memcpy(ctrl, &dev->probe, sizeof *ctrl); else memcpy(ctrl, &dev->commit, sizeof *ctrl); break; case UVC_GET_MIN: case UVC_GET_MAX: case UVC_GET_DEF: uvc_fill_streaming_control(dev, ctrl, req == UVC_GET_MAX ? -1 : 1, req == UVC_GET_MAX ? -1 : 1, 0); break; case UVC_GET_RES: memset(ctrl, 0, sizeof *ctrl); break; case UVC_GET_LEN: resp->data[0] = 0x00; resp->data[1] = 0x22; resp->length = 2; break; case UVC_GET_INFO: resp->data[0] = 0x03; resp->length = 1; break; } } static void uvc_events_process_class(struct uvc_device *dev, const struct usb_ctrlrequest *ctrl, struct uvc_request_data *resp) { unsigned int interface = ctrl->wIndex & 0xff; if ((ctrl->bRequestType & USB_RECIP_MASK) != USB_RECIP_INTERFACE) return; if (interface == dev->fc->control.intf.bInterfaceNumber) uvc_events_process_control(dev, ctrl->bRequest, ctrl->wValue >> 8, resp); else if (interface == dev->fc->streaming.intf.bInterfaceNumber) uvc_events_process_streaming(dev, ctrl->bRequest, ctrl->wValue >> 8, resp); } static void uvc_events_process_setup(struct uvc_device *dev, const struct usb_ctrlrequest *ctrl, struct uvc_request_data *resp) { dev->control = 0; printf("bRequestType %02x bRequest %02x wValue %04x wIndex %04x " "wLength %04x\n", ctrl->bRequestType, ctrl->bRequest, ctrl->wValue, ctrl->wIndex, ctrl->wLength); switch (ctrl->bRequestType & USB_TYPE_MASK) { case USB_TYPE_STANDARD: uvc_events_process_standard(dev, ctrl, resp); break; case USB_TYPE_CLASS: uvc_events_process_class(dev, ctrl, resp); break; default: break; } } static void uvc_events_process_data(struct uvc_stream *stream, const struct uvc_request_data *data) { struct uvc_device *dev = stream->uvc; const struct uvc_streaming_control *ctrl = (const struct uvc_streaming_control *)&data->data; struct uvc_streaming_control *target; switch (dev->control) { case UVC_VS_PROBE_CONTROL: printf("setting probe control, length = %d\n", data->length); target = &dev->probe; break; case UVC_VS_COMMIT_CONTROL: printf("setting commit control, length = %d\n", data->length); target = &dev->commit; break; default: printf("setting unknown control, length = %d\n", data->length); return; } uvc_fill_streaming_control(dev, target, ctrl->bFormatIndex, ctrl->bFrameIndex, ctrl->dwFrameInterval); if (dev->control == UVC_VS_COMMIT_CONTROL) { const struct uvc_function_config_format *format; const struct uvc_function_config_frame *frame; format = &dev->fc->streaming.formats[target->bFormatIndex-1]; frame = &format->frames[target->bFrameIndex-1]; dev->fcc = format->fcc; dev->width = frame->width; dev->height = frame->height; uvc_stream_set_format(stream); } } void uvc_events_process(void *d) { struct uvc_stream *stream = d; struct uvc_device *dev = stream->uvc; struct v4l2_event v4l2_event; const struct uvc_event *uvc_event = (void *)&v4l2_event.u.data; struct uvc_request_data resp; int ret; ret = ioctl(dev->vdev->fd, VIDIOC_DQEVENT, &v4l2_event); if (ret < 0) { printf("VIDIOC_DQEVENT failed: %s (%d)\n", strerror(errno), errno); return; } memset(&resp, 0, sizeof resp); resp.length = -EL2HLT; switch (v4l2_event.type) { case UVC_EVENT_CONNECT: case UVC_EVENT_DISCONNECT: return; case UVC_EVENT_SETUP: uvc_events_process_setup(dev, &uvc_event->req, &resp); break; case UVC_EVENT_DATA: uvc_events_process_data(stream, &uvc_event->data); return; case UVC_EVENT_STREAMON: uvc_stream_enable(stream, 1); return; case UVC_EVENT_STREAMOFF: uvc_stream_enable(stream, 0); return; } ioctl(dev->vdev->fd, UVCIOC_SEND_RESPONSE, &resp); if (ret < 0) { printf("UVCIOC_S_EVENT failed: %s (%d)\n", strerror(errno), errno); return; } } void uvc_events_init(struct uvc_device *dev) { struct v4l2_event_subscription sub; /* Default to the minimum values. */ uvc_fill_streaming_control(dev, &dev->probe, 1, 1, 0); uvc_fill_streaming_control(dev, &dev->commit, 1, 1, 0); memset(&sub, 0, sizeof sub); sub.type = UVC_EVENT_SETUP; ioctl(dev->vdev->fd, VIDIOC_SUBSCRIBE_EVENT, &sub); sub.type = UVC_EVENT_DATA; ioctl(dev->vdev->fd, VIDIOC_SUBSCRIBE_EVENT, &sub); sub.type = UVC_EVENT_STREAMON; ioctl(dev->vdev->fd, VIDIOC_SUBSCRIBE_EVENT, &sub); sub.type = UVC_EVENT_STREAMOFF; ioctl(dev->vdev->fd, VIDIOC_SUBSCRIBE_EVENT, &sub); }