diff options
Diffstat (limited to 'uvc.c')
| -rw-r--r-- | uvc.c | 340 |
1 files changed, 340 insertions, 0 deletions
@@ -0,0 +1,340 @@ +/* + * UVC protocol handling + * + * Copyright (C) 2010 Ideas on board SPRL <laurent.pinchart@ideasonboard.com> + * + * 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 <errno.h> +#include <linux/usb/ch9.h> +#include <linux/usb/g_uvc.h> +#include <linux/usb/video.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/ioctl.h> + +#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); +} |