1 files changed, 395 insertions, 0 deletions
diff --git a/lib/uvc.c b/lib/uvc.c
new file mode 100644
index 0000000..81d1760
--- /dev/null
+++ b/lib/uvc.c
@@ -0,0 +1,395 @@
+/*
+ * 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 "events.h"
+#include "stream.h"
+#include "tools.h"
+#include "uvc.h"
+#include "v4l2.h"
+
+struct uvc_device
+{
+	struct v4l2_device *vdev;
+
+	struct uvc_stream *stream;
+	struct uvc_function_config *fc;
+
+	struct uvc_streaming_control probe;
+	struct uvc_streaming_control commit;
+
+	int control;
+
+	unsigned int fcc;
+	unsigned int width;
+	unsigned int height;
+	unsigned int maxsize;
+};
+
+struct uvc_device *uvc_open(const char *devname, struct uvc_stream *stream)
+{
+	struct uvc_device *dev;
+
+	dev = malloc(sizeof *dev);
+	if (dev == NULL)
+		return NULL;
+
+	memset(dev, 0, sizeof *dev);
+	dev->stream = stream;
+
+	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_device *dev,
+			const struct uvc_request_data *data)
+{
+	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;
+		struct v4l2_pix_format pixfmt;
+
+		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;
+
+		memset(&pixfmt, 0, sizeof pixfmt);
+		pixfmt.width = frame->width;
+		pixfmt.height = frame->height;
+		pixfmt.pixelformat = format->fcc;
+		pixfmt.field = V4L2_FIELD_NONE;
+		if (format->fcc == V4L2_PIX_FMT_MJPEG)
+			pixfmt.sizeimage = dev->maxsize * 1.5;
+
+		uvc_stream_set_format(dev->stream, &pixfmt);
+	}
+}
+
+static void uvc_events_process(void *d)
+{
+	struct uvc_device *dev = d;
+	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(dev, &uvc_event->data);
+		return;
+
+	case UVC_EVENT_STREAMON:
+		uvc_stream_enable(dev->stream, 1);
+		return;
+
+	case UVC_EVENT_STREAMOFF:
+		uvc_stream_enable(dev->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;
+	}
+}
+
+/* ---------------------------------------------------------------------------
+ * Initialization and setup
+ */
+
+void uvc_events_init(struct uvc_device *dev, struct events *events)
+{
+	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);
+
+	events_watch_fd(events, dev->vdev->fd, EVENT_EXCEPTION,
+			uvc_events_process, dev);
+}
+
+void uvc_set_config(struct uvc_device *dev, struct uvc_function_config *fc)
+{
+	/* FIXME: The maximum size should be specified per format and frame. */
+	dev->maxsize = 0;
+	dev->fc = fc;
+}
+
+int uvc_set_format(struct uvc_device *dev, struct v4l2_pix_format *format)
+{
+	return v4l2_set_format(dev->vdev, format);
+}
+
+struct v4l2_device *uvc_v4l2_device(struct uvc_device *dev)
+{
+	/*
+	 * TODO: The V4L2 device shouldn't be exposed. We should replace this
+	 * with an abstract video sink class when one will be avaiilable.
+	 */
+	return dev->vdev;
+}