Initial import

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

2 files changed, 762 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..4837ec9
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,18 @@
+CROSS_COMPILE	?=
+ARCH		?= x86
+KERNEL_DIR	?= /usr/src/linux
+
+CC		:= $(CROSS_COMPILE)gcc
+KERNEL_INCLUDE	:= -I$(KERNEL_DIR)/include -I$(KERNEL_DIR)/arch/$(ARCH)/include
+CFLAGS		:= -W -Wall -g $(KERNEL_INCLUDE)
+LDFLAGS		:= -g
+
+all: uvc-gadget
+
+uvc-gadget: uvc-gadget.o
+	$(CC) $(LDFLAGS) -o $@ $^
+
+clean:
+	rm -f *.o
+	rm -f uvc-gadget
+
diff --git a/uvc-gadget.c b/uvc-gadget.c
new file mode 100644
index 0000000..9ef315c
--- /dev/null
+++ b/uvc-gadget.c
@@ -0,0 +1,744 @@
+/*
+ * UVC gadget test application
+ *
+ * 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 <sys/time.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/select.h>
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+
+#include <linux/usb/ch9.h>
+#include <linux/usb/video.h>
+#include <linux/videodev2.h>
+
+#include "../drivers/usb/gadget/uvc.h"
+
+#define clamp(val, min, max) ({                 \
+        typeof(val) __val = (val);              \
+        typeof(min) __min = (min);              \
+        typeof(max) __max = (max);              \
+        (void) (&__val == &__min);              \
+        (void) (&__val == &__max);              \
+        __val = __val < __min ? __min: __val;   \
+        __val > __max ? __max: __val; })
+
+#define ARRAY_SIZE(a)	((sizeof(a) / sizeof(a[0])))
+
+struct uvc_device
+{
+	int fd;
+
+	struct uvc_streaming_control probe;
+	struct uvc_streaming_control commit;
+
+	int control;
+
+	unsigned int fcc;
+	unsigned int width;
+	unsigned int height;
+
+	void **mem;
+	unsigned int nbufs;
+	unsigned int bufsize;
+
+	unsigned int bulk;
+	uint8_t color;
+	unsigned int imgsize;
+	void *imgdata;
+};
+
+static struct uvc_device *
+uvc_open(const char *devname)
+{
+	struct uvc_device *dev;
+	struct v4l2_capability cap;
+	int ret;
+	int fd;
+
+	fd = open(devname, O_RDWR | O_NONBLOCK);
+	if (fd == -1) {
+		printf("v4l2 open failed: %s (%d)\n", strerror(errno), errno);
+		return NULL;
+	}
+
+	printf("open succeeded, file descriptor = %d\n", fd);
+
+	ret = ioctl(fd, VIDIOC_QUERYCAP, &cap);
+	if (ret < 0) {
+		printf("unable to query device: %s (%d)\n", strerror(errno),
+			errno);
+		close(fd);
+		return NULL;
+        }
+
+	printf("device is %s on bus %s\n", cap.card, cap.bus_info);
+
+	dev = malloc(sizeof *dev);
+	if (dev == NULL) {
+		close(fd);
+		return NULL;
+	}
+
+	memset(dev, 0, sizeof *dev);
+	dev->fd = fd;
+
+	return dev;
+}
+
+static void
+uvc_close(struct uvc_device *dev)
+{
+	close(dev->fd);
+	free(dev->imgdata);
+	free(dev->mem);
+	free(dev);
+}
+
+/* ---------------------------------------------------------------------------
+ * Video streaming
+ */
+
+static void
+uvc_video_fill_buffer(struct uvc_device *dev, struct v4l2_buffer *buf)
+{
+	unsigned int bpl;
+	unsigned int i;
+
+	switch (dev->fcc) {
+	case V4L2_PIX_FMT_YUYV:
+		/* Fill the buffer with video data. */
+		bpl = dev->width * 2;
+		for (i = 0; i < dev->height; ++i)
+			memset(dev->mem[buf->index] + i*bpl, dev->color++, bpl);
+
+		buf->bytesused = bpl * dev->height;
+		break;
+
+	case V4L2_PIX_FMT_MJPEG:
+		memcpy(dev->mem[buf->index], dev->imgdata, dev->imgsize);
+		buf->bytesused = dev->imgsize;
+		break;
+	}
+}
+
+static int
+uvc_video_process(struct uvc_device *dev)
+{
+	struct v4l2_buffer buf;
+	int ret;
+
+	memset(&buf, 0, sizeof buf);
+	buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+	buf.memory = V4L2_MEMORY_MMAP;
+
+	if ((ret = ioctl(dev->fd, VIDIOC_DQBUF, &buf)) < 0) {
+		printf("Unable to dequeue buffer: %s (%d).\n", strerror(errno),
+			errno);
+		return ret;
+	}
+
+	uvc_video_fill_buffer(dev, &buf);
+
+	if ((ret = ioctl(dev->fd, VIDIOC_QBUF, &buf)) < 0) {
+		printf("Unable to requeue buffer: %s (%d).\n", strerror(errno),
+			errno);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int
+uvc_video_reqbufs(struct uvc_device *dev, int nbufs)
+{
+	struct v4l2_requestbuffers rb;
+	struct v4l2_buffer buf;
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < dev->nbufs; ++i)
+		munmap(dev->mem[i], dev->bufsize);
+
+	free(dev->mem);
+	dev->mem = 0;
+	dev->nbufs = 0;
+
+	memset(&rb, 0, sizeof rb);
+	rb.count = nbufs;
+	rb.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+	rb.memory = V4L2_MEMORY_MMAP;
+
+	ret = ioctl(dev->fd, VIDIOC_REQBUFS, &rb);
+	if (ret < 0) {
+		printf("Unable to allocate buffers: %s (%d).\n",
+			strerror(errno), errno);
+		return ret;
+	}
+
+	printf("%u buffers allocated.\n", rb.count);
+
+	/* Map the buffers. */
+	dev->mem = malloc(rb.count * sizeof dev->mem[0]);
+
+	for (i = 0; i < rb.count; ++i) {
+		memset(&buf, 0, sizeof buf);
+		buf.index = i;
+		buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+		buf.memory = V4L2_MEMORY_MMAP;
+		ret = ioctl(dev->fd, VIDIOC_QUERYBUF, &buf);
+		if (ret < 0) {
+			printf("Unable to query buffer %u: %s (%d).\n", i,
+				strerror(errno), errno);
+			return -1;
+		}
+		printf("length: %u offset: %u\n", buf.length, buf.m.offset);
+
+		dev->mem[i] = mmap(0, buf.length, PROT_READ | PROT_WRITE, MAP_SHARED, dev->fd, buf.m.offset);
+		if (dev->mem[i] == MAP_FAILED) {
+			printf("Unable to map buffer %u: %s (%d)\n", i,
+				strerror(errno), errno);
+			return -1;
+		}
+		printf("Buffer %u mapped at address %p.\n", i, dev->mem[i]);
+	}
+
+	dev->bufsize = buf.length;
+	dev->nbufs = rb.count;
+
+	return 0;
+}
+
+static int
+uvc_video_stream(struct uvc_device *dev, int enable)
+{
+	struct v4l2_buffer buf;
+	unsigned int i;
+	int type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+	int ret;
+
+	if (!enable) {
+		printf("Stopping video stream.\n");
+		ioctl(dev->fd, VIDIOC_STREAMOFF, &type);
+		return 0;
+	}
+
+	printf("Starting video stream.\n");
+
+	for (i = 0; i < dev->nbufs; ++i) {
+		memset(&buf, 0, sizeof buf);
+
+		buf.index = i;
+		buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+		buf.memory = V4L2_MEMORY_MMAP;
+
+		uvc_video_fill_buffer(dev, &buf);
+
+		printf("Queueing buffer %u.\n", i);
+		if ((ret = ioctl(dev->fd, VIDIOC_QBUF, &buf)) < 0) {
+			printf("Unable to queue buffer: %s (%d).\n",
+				strerror(errno), errno);
+			break;
+		}
+	}
+
+	ioctl(dev->fd, VIDIOC_STREAMON, &type);
+	return ret;
+}
+
+static int
+uvc_video_set_format(struct uvc_device *dev)
+{
+	struct v4l2_format fmt;
+	int ret;
+
+	printf("Setting format to 0x%08x %ux%u\n",
+		dev->fcc, dev->width, dev->height);
+
+	memset(&fmt, 0, sizeof fmt);
+	fmt.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+	fmt.fmt.pix.width = dev->width;
+	fmt.fmt.pix.height = dev->height;
+	fmt.fmt.pix.pixelformat = dev->fcc;
+	fmt.fmt.pix.field = V4L2_FIELD_NONE;
+	if (dev->fcc == V4L2_PIX_FMT_MJPEG)
+		fmt.fmt.pix.sizeimage = dev->imgsize * 1.5;
+
+	if ((ret = ioctl(dev->fd, VIDIOC_S_FMT, &fmt)) < 0)
+		printf("Unable to set format: %s (%d).\n",
+			strerror(errno), errno);
+
+	return ret;
+}
+
+static int
+uvc_video_init(struct uvc_device *dev __attribute__((__unused__)))
+{
+	return 0;
+}
+
+/* ---------------------------------------------------------------------------
+ * Request processing
+ */
+
+struct uvc_frame_info
+{
+	unsigned int width;
+	unsigned int height;
+	unsigned int intervals[8];
+};
+
+struct uvc_format_info
+{
+	unsigned int fcc;
+	const struct uvc_frame_info *frames;
+};
+
+static const struct uvc_frame_info uvc_frames_yuyv[] = {
+	{  640, 360, { 666666, 10000000, 50000000, 0 }, },
+	{ 1280, 720, { 50000000, 0 }, },
+	{ 0, 0, { 0, }, },
+};
+
+static const struct uvc_frame_info uvc_frames_mjpeg[] = {
+	{  640, 360, { 666666, 10000000, 50000000, 0 }, },
+	{ 1280, 720, { 50000000, 0 }, },
+	{ 0, 0, { 0, }, },
+};
+
+static const struct uvc_format_info uvc_formats[] = {
+	{ V4L2_PIX_FMT_YUYV, uvc_frames_yuyv },
+	{ V4L2_PIX_FMT_MJPEG, uvc_frames_mjpeg },
+};
+
+static void
+uvc_fill_streaming_control(struct uvc_device *dev,
+			   struct uvc_streaming_control *ctrl,
+			   int iframe, int iformat)
+{
+	const struct uvc_format_info *format;
+	const struct uvc_frame_info *frame;
+	unsigned int nframes;
+
+	if (iformat < 0)
+		iformat = ARRAY_SIZE(uvc_formats) + iformat;
+	if (iformat < 0 || iformat >= (int)ARRAY_SIZE(uvc_formats))
+		return;
+	format = &uvc_formats[iformat];
+
+	nframes = 0;
+	while (format->frames[nframes].width != 0)
+		++nframes;
+
+	if (iframe < 0)
+		iframe = nframes + iframe;
+	if (iframe < 0 || iframe >= (int)nframes)
+		return;
+	frame = &format->frames[iframe];
+
+	memset(ctrl, 0, sizeof *ctrl);
+
+	ctrl->bmHint = 1;
+	ctrl->bFormatIndex = iformat + 1;
+	ctrl->bFrameIndex = iframe + 1;
+	ctrl->dwFrameInterval = frame->intervals[0];
+	switch (format->fcc) {
+	case V4L2_PIX_FMT_YUYV:
+		ctrl->dwMaxVideoFrameSize = frame->width * frame->height * 2;
+		break;
+	case V4L2_PIX_FMT_MJPEG:
+		ctrl->dwMaxVideoFrameSize = dev->imgsize;
+		break;
+	}
+	ctrl->dwMaxPayloadTransferSize = 512;	/* TODO this should be filled by the driver. */
+	ctrl->bmFramingInfo = 3;
+	ctrl->bPreferedVersion = 1;
+	ctrl->bMaxVersion = 1;
+}
+
+static void
+uvc_events_process_standard(struct uvc_device *dev, 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 : 0,
+					   req == UVC_GET_MAX ? -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, struct usb_ctrlrequest *ctrl,
+			 struct uvc_request_data *resp)
+{
+	if ((ctrl->bRequestType & USB_RECIP_MASK) != USB_RECIP_INTERFACE)
+		return;
+
+	switch (ctrl->wIndex & 0xff) {
+	case UVC_INTF_CONTROL:
+		uvc_events_process_control(dev, ctrl->bRequest, ctrl->wValue >> 8, resp);
+		break;
+
+	case UVC_INTF_STREAMING:
+		uvc_events_process_streaming(dev, ctrl->bRequest, ctrl->wValue >> 8, resp);
+		break;
+
+	default:
+		break;
+	}
+}
+
+static void
+uvc_events_process_setup(struct uvc_device *dev, 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, struct uvc_request_data *data)
+{
+	struct uvc_streaming_control *target;
+	struct uvc_streaming_control *ctrl;
+	const struct uvc_format_info *format;
+	const struct uvc_frame_info *frame;
+	const unsigned int *interval;
+	unsigned int iformat, iframe;
+	unsigned int nframes;
+
+	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;
+	}
+
+	ctrl = (struct uvc_streaming_control *)&data->data;
+	iformat = clamp((unsigned int)ctrl->bFormatIndex, 1U,
+			(unsigned int)ARRAY_SIZE(uvc_formats));
+	format = &uvc_formats[iformat-1];
+
+	nframes = 0;
+	while (format->frames[nframes].width != 0)
+		++nframes;
+
+	iframe = clamp((unsigned int)ctrl->bFrameIndex, 1U, nframes);
+	frame = &format->frames[iframe-1];
+	interval = frame->intervals;
+
+	while (interval[0] < ctrl->dwFrameInterval && interval[1])
+		++interval;
+
+	target->bFormatIndex = iformat;
+	target->bFrameIndex = iframe;
+	switch (format->fcc) {
+	case V4L2_PIX_FMT_YUYV:
+		target->dwMaxVideoFrameSize = frame->width * frame->height * 2;
+		break;
+	case V4L2_PIX_FMT_MJPEG:
+		if (dev->imgsize == 0)
+			printf("WARNING: MJPEG requested and no image loaded.\n");
+		target->dwMaxVideoFrameSize = dev->imgsize;
+		break;
+	}
+	target->dwFrameInterval = *interval;
+
+	if (dev->control == UVC_VS_COMMIT_CONTROL) {
+		dev->fcc = format->fcc;
+		dev->width = frame->width;
+		dev->height = frame->height;
+
+		uvc_video_set_format(dev);
+		if (dev->bulk)
+			uvc_video_stream(dev, 1);
+	}
+}
+
+static void
+uvc_events_process(struct uvc_device *dev)
+{
+	struct v4l2_event v4l2_event;
+	struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
+	struct uvc_request_data resp;
+	int ret;
+
+	ret = ioctl(dev->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_video_reqbufs(dev, 4);
+		uvc_video_stream(dev, 1);
+		break;
+
+	case UVC_EVENT_STREAMOFF:
+		uvc_video_stream(dev, 0);
+		uvc_video_reqbufs(dev, 0);
+		break;
+	}
+
+	ioctl(dev->fd, UVCIOC_SEND_RESPONSE, &resp);
+	if (ret < 0) {
+		printf("UVCIOC_S_EVENT failed: %s (%d)\n", strerror(errno),
+			errno);
+		return;
+	}
+}
+
+static void
+uvc_events_init(struct uvc_device *dev)
+{
+	struct v4l2_event_subscription sub;
+
+	uvc_fill_streaming_control(dev, &dev->probe, 0, 0);
+	uvc_fill_streaming_control(dev, &dev->commit, 0, 0);
+
+	if (dev->bulk) {
+		/* FIXME Crude hack, must be negotiated with the driver. */
+		dev->probe.dwMaxPayloadTransferSize = 16 * 1024;
+		dev->commit.dwMaxPayloadTransferSize = 16 * 1024;
+	}
+
+
+	memset(&sub, 0, sizeof sub);
+	sub.type = UVC_EVENT_SETUP;
+	ioctl(dev->fd, VIDIOC_SUBSCRIBE_EVENT, &sub);
+	sub.type = UVC_EVENT_DATA;
+	ioctl(dev->fd, VIDIOC_SUBSCRIBE_EVENT, &sub);
+	sub.type = UVC_EVENT_STREAMON;
+	ioctl(dev->fd, VIDIOC_SUBSCRIBE_EVENT, &sub);
+	sub.type = UVC_EVENT_STREAMOFF;
+	ioctl(dev->fd, VIDIOC_SUBSCRIBE_EVENT, &sub);
+}
+
+/* ---------------------------------------------------------------------------
+ * main
+ */
+
+static void image_load(struct uvc_device *dev, const char *img)
+{
+	int fd = -1;
+
+	if (img == NULL)
+		return;
+
+	fd = open(img, O_RDONLY);
+	if (fd == -1) {
+		printf("Unable to open MJPEG image '%s'\n", img);
+		return;
+	}
+
+	dev->imgsize = lseek(fd, 0, SEEK_END);
+	lseek(fd, 0, SEEK_SET);
+	dev->imgdata = malloc(dev->imgsize);
+	if (dev->imgdata == NULL) {
+		printf("Unable to allocate memory for MJPEG image\n");
+		dev->imgsize = 0;
+		return;
+	}
+
+	read(fd, dev->imgdata, dev->imgsize);
+	close(fd);
+}
+
+static void usage(const char *argv0)
+{
+	fprintf(stderr, "Usage: %s [options]\n", argv0);
+	fprintf(stderr, "Available options are\n");
+	fprintf(stderr, " -b		Use bulk mode\n");
+	fprintf(stderr, " -d device	Video device\n");
+	fprintf(stderr, " -h		Print this help screen and exit\n");
+	fprintf(stderr, " -i image	MJPEG image\n");
+}
+
+int main(int argc, char *argv[])
+{
+	char *device = "/dev/video0";
+	struct uvc_device *dev;
+	int bulk_mode = 0;
+	char *mjpeg_image = NULL;
+	fd_set fds;
+	int ret, opt;
+
+	while ((opt = getopt(argc, argv, "bd:hi:")) != -1) {
+		switch (opt) {
+		case 'b':
+			bulk_mode = 1;
+			break;
+
+		case 'd':
+			device = optarg;
+			break;
+
+		case 'h':
+			usage(argv[0]);
+			return 0;
+
+		case 'i':
+			mjpeg_image = optarg;
+			break;
+
+		default:
+			fprintf(stderr, "Invalid option '-%c'\n", opt);
+			usage(argv[0]);
+			return 1;
+		}
+	}
+
+	dev = uvc_open(device);
+	if (dev == NULL)
+		return 1;
+
+	image_load(dev, mjpeg_image);
+
+	dev->bulk = bulk_mode;
+
+	uvc_events_init(dev);
+	uvc_video_init(dev);
+
+	FD_ZERO(&fds);
+	FD_SET(dev->fd, &fds);
+
+	while (1) {
+		fd_set efds = fds;
+		fd_set wfds = fds;
+
+		ret = select(dev->fd + 1, NULL, &wfds, &efds, NULL);
+		if (FD_ISSET(dev->fd, &efds))
+			uvc_events_process(dev);
+		if (FD_ISSET(dev->fd, &wfds))
+			uvc_video_process(dev);
+	}
+
+	uvc_close(dev);
+	return 0;
+}
+