USB gadget: video class function driver (cdda479f) · Commits · e / devices / android_kernel_oneplus_sm8150

drivers/usb/gadget/f_uvc.c

0 → 100644

+661 −0

Original line number	Diff line number	Diff line
		/*
		* uvc_gadget.c -- USB Video Class Gadget driver
		*
		* Copyright (C) 2009-2010
		* Laurent Pinchart (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.
		*
		*/

		#include <linux/kernel.h>
		#include <linux/device.h>
		#include <linux/errno.h>
		#include <linux/fs.h>
		#include <linux/list.h>
		#include <linux/mutex.h>
		#include <linux/usb/ch9.h>
		#include <linux/usb/gadget.h>
		#include <linux/usb/video.h>
		#include <linux/vmalloc.h>
		#include <linux/wait.h>

		#include <media/v4l2-dev.h>
		#include <media/v4l2-event.h>

		#include "uvc.h"

		unsigned int uvc_trace_param;

		/* --------------------------------------------------------------------------
		* Function descriptors
		*/

		/* string IDs are assigned dynamically */

		#define UVC_STRING_ASSOCIATION_IDX 0
		#define UVC_STRING_CONTROL_IDX 1
		#define UVC_STRING_STREAMING_IDX 2

		static struct usb_string uvc_en_us_strings[] = {
		[UVC_STRING_ASSOCIATION_IDX].s = "UVC Camera",
		[UVC_STRING_CONTROL_IDX].s = "Video Control",
		[UVC_STRING_STREAMING_IDX].s = "Video Streaming",
		{ }
		};

		static struct usb_gadget_strings uvc_stringtab = {
		.language = 0x0409, /* en-us */
		.strings = uvc_en_us_strings,
		};

		static struct usb_gadget_strings *uvc_function_strings[] = {
		&uvc_stringtab,
		NULL,
		};

		#define UVC_INTF_VIDEO_CONTROL 0
		#define UVC_INTF_VIDEO_STREAMING 1

		static struct usb_interface_assoc_descriptor uvc_iad __initdata = {
		.bLength = USB_DT_INTERFACE_ASSOCIATION_SIZE,
		.bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
		.bFirstInterface = 0,
		.bInterfaceCount = 2,
		.bFunctionClass = USB_CLASS_VIDEO,
		.bFunctionSubClass = 0x03,
		.bFunctionProtocol = 0x00,
		.iFunction = 0,
		};

		static struct usb_interface_descriptor uvc_control_intf __initdata = {
		.bLength = USB_DT_INTERFACE_SIZE,
		.bDescriptorType = USB_DT_INTERFACE,
		.bInterfaceNumber = UVC_INTF_VIDEO_CONTROL,
		.bAlternateSetting = 0,
		.bNumEndpoints = 1,
		.bInterfaceClass = USB_CLASS_VIDEO,
		.bInterfaceSubClass = 0x01,
		.bInterfaceProtocol = 0x00,
		.iInterface = 0,
		};

		static struct usb_endpoint_descriptor uvc_control_ep __initdata = {
		.bLength = USB_DT_ENDPOINT_SIZE,
		.bDescriptorType = USB_DT_ENDPOINT,
		.bEndpointAddress = USB_DIR_IN,
		.bmAttributes = USB_ENDPOINT_XFER_INT,
		.wMaxPacketSize = cpu_to_le16(16),
		.bInterval = 8,
		};

		static struct uvc_control_endpoint_descriptor uvc_control_cs_ep __initdata = {
		.bLength = UVC_DT_CONTROL_ENDPOINT_SIZE,
		.bDescriptorType = USB_DT_CS_ENDPOINT,
		.bDescriptorSubType = UVC_EP_INTERRUPT,
		.wMaxTransferSize = cpu_to_le16(16),
		};

		static struct usb_interface_descriptor uvc_streaming_intf_alt0 __initdata = {
		.bLength = USB_DT_INTERFACE_SIZE,
		.bDescriptorType = USB_DT_INTERFACE,
		.bInterfaceNumber = UVC_INTF_VIDEO_STREAMING,
		.bAlternateSetting = 0,
		.bNumEndpoints = 0,
		.bInterfaceClass = USB_CLASS_VIDEO,
		.bInterfaceSubClass = 0x02,
		.bInterfaceProtocol = 0x00,
		.iInterface = 0,
		};

		static struct usb_interface_descriptor uvc_streaming_intf_alt1 __initdata = {
		.bLength = USB_DT_INTERFACE_SIZE,
		.bDescriptorType = USB_DT_INTERFACE,
		.bInterfaceNumber = UVC_INTF_VIDEO_STREAMING,
		.bAlternateSetting = 1,
		.bNumEndpoints = 1,
		.bInterfaceClass = USB_CLASS_VIDEO,
		.bInterfaceSubClass = 0x02,
		.bInterfaceProtocol = 0x00,
		.iInterface = 0,
		};

		static struct usb_endpoint_descriptor uvc_streaming_ep = {
		.bLength = USB_DT_ENDPOINT_SIZE,
		.bDescriptorType = USB_DT_ENDPOINT,
		.bEndpointAddress = USB_DIR_IN,
		.bmAttributes = USB_ENDPOINT_XFER_ISOC,
		.wMaxPacketSize = cpu_to_le16(512),
		.bInterval = 1,
		};

		static const struct usb_descriptor_header * const uvc_fs_streaming[] = {
		(struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
		(struct usb_descriptor_header *) &uvc_streaming_ep,
		NULL,
		};

		static const struct usb_descriptor_header * const uvc_hs_streaming[] = {
		(struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
		(struct usb_descriptor_header *) &uvc_streaming_ep,
		NULL,
		};

		/* --------------------------------------------------------------------------
		* Control requests
		*/

		static void
		uvc_function_ep0_complete(struct usb_ep ep, struct usb_request req)
		{
		struct uvc_device *uvc = req->context;
		struct v4l2_event v4l2_event;
		struct uvc_event uvc_event = (void )&v4l2_event.u.data;

		if (uvc->event_setup_out) {
		uvc->event_setup_out = 0;

		memset(&v4l2_event, 0, sizeof(v4l2_event));
		v4l2_event.type = UVC_EVENT_DATA;
		uvc_event->data.length = req->actual;
		memcpy(&uvc_event->data.data, req->buf, req->actual);
		v4l2_event_queue(uvc->vdev, &v4l2_event);
		}
		}

		static int
		uvc_function_setup(struct usb_function f, const struct usb_ctrlrequest ctrl)
		{
		struct uvc_device *uvc = to_uvc(f);
		struct v4l2_event v4l2_event;
		struct uvc_event uvc_event = (void )&v4l2_event.u.data;

		/* printk(KERN_INFO "setup request %02x %02x value %04x index %04x %04x\n",
		* ctrl->bRequestType, ctrl->bRequest, le16_to_cpu(ctrl->wValue),
		* le16_to_cpu(ctrl->wIndex), le16_to_cpu(ctrl->wLength));
		*/

		if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) {
		INFO(f->config->cdev, "invalid request type\n");
		return -EINVAL;
		}

		/* Stall too big requests. */
		if (le16_to_cpu(ctrl->wLength) > UVC_MAX_REQUEST_SIZE)
		return -EINVAL;

		memset(&v4l2_event, 0, sizeof(v4l2_event));
		v4l2_event.type = UVC_EVENT_SETUP;
		memcpy(&uvc_event->req, ctrl, sizeof(uvc_event->req));
		v4l2_event_queue(uvc->vdev, &v4l2_event);

		return 0;
		}

		static int
		uvc_function_get_alt(struct usb_function *f, unsigned interface)
		{
		struct uvc_device *uvc = to_uvc(f);

		INFO(f->config->cdev, "uvc_function_get_alt(%u)\n", interface);

		if (interface == uvc->control_intf)
		return 0;
		else if (interface != uvc->streaming_intf)
		return -EINVAL;
		else
		return uvc->state == UVC_STATE_STREAMING ? 1 : 0;
		}

		static int
		uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
		{
		struct uvc_device *uvc = to_uvc(f);
		struct v4l2_event v4l2_event;
		struct uvc_event uvc_event = (void )&v4l2_event.u.data;

		INFO(f->config->cdev, "uvc_function_set_alt(%u, %u)\n", interface, alt);

		if (interface == uvc->control_intf) {
		if (alt)
		return -EINVAL;

		if (uvc->state == UVC_STATE_DISCONNECTED) {
		memset(&v4l2_event, 0, sizeof(v4l2_event));
		v4l2_event.type = UVC_EVENT_CONNECT;
		uvc_event->speed = f->config->cdev->gadget->speed;
		v4l2_event_queue(uvc->vdev, &v4l2_event);

		uvc->state = UVC_STATE_CONNECTED;
		}

		return 0;
		}

		if (interface != uvc->streaming_intf)
		return -EINVAL;

		/* TODO
		if (usb_endpoint_xfer_bulk(&uvc->desc.vs_ep))
		return alt ? -EINVAL : 0;
		*/

		switch (alt) {
		case 0:
		if (uvc->state != UVC_STATE_STREAMING)
		return 0;

		if (uvc->video.ep)
		usb_ep_disable(uvc->video.ep);

		memset(&v4l2_event, 0, sizeof(v4l2_event));
		v4l2_event.type = UVC_EVENT_STREAMOFF;
		v4l2_event_queue(uvc->vdev, &v4l2_event);

		uvc->state = UVC_STATE_CONNECTED;
		break;

		case 1:
		if (uvc->state != UVC_STATE_CONNECTED)
		return 0;

		if (uvc->video.ep)
		usb_ep_enable(uvc->video.ep, &uvc_streaming_ep);

		memset(&v4l2_event, 0, sizeof(v4l2_event));
		v4l2_event.type = UVC_EVENT_STREAMON;
		v4l2_event_queue(uvc->vdev, &v4l2_event);

		uvc->state = UVC_STATE_STREAMING;
		break;

		default:
		return -EINVAL;
		}

		return 0;
		}

		static void
		uvc_function_disable(struct usb_function *f)
		{
		struct uvc_device *uvc = to_uvc(f);
		struct v4l2_event v4l2_event;

		INFO(f->config->cdev, "uvc_function_disable\n");

		memset(&v4l2_event, 0, sizeof(v4l2_event));
		v4l2_event.type = UVC_EVENT_DISCONNECT;
		v4l2_event_queue(uvc->vdev, &v4l2_event);

		uvc->state = UVC_STATE_DISCONNECTED;
		}

		/* --------------------------------------------------------------------------
		* Connection / disconnection
		*/

		void
		uvc_function_connect(struct uvc_device *uvc)
		{
		struct usb_composite_dev *cdev = uvc->func.config->cdev;
		int ret;

		if ((ret = usb_function_activate(&uvc->func)) < 0)
		INFO(cdev, "UVC connect failed with %d\n", ret);
		}

		void
		uvc_function_disconnect(struct uvc_device *uvc)
		{
		struct usb_composite_dev *cdev = uvc->func.config->cdev;
		int ret;

		if ((ret = usb_function_deactivate(&uvc->func)) < 0)
		INFO(cdev, "UVC disconnect failed with %d\n", ret);
		}

		/* --------------------------------------------------------------------------
		* USB probe and disconnect
		*/

		static int
		uvc_register_video(struct uvc_device *uvc)
		{
		struct usb_composite_dev *cdev = uvc->func.config->cdev;
		struct video_device *video;

		/* TODO reference counting. */
		video = video_device_alloc();
		if (video == NULL)
		return -ENOMEM;

		video->parent = &cdev->gadget->dev;
		video->minor = -1;
		video->fops = &uvc_v4l2_fops;
		video->release = video_device_release;
		strncpy(video->name, cdev->gadget->name, sizeof(video->name));

		uvc->vdev = video;
		video_set_drvdata(video, uvc);

		return video_register_device(video, VFL_TYPE_GRABBER, -1);
		}

		#define UVC_COPY_DESCRIPTOR(mem, dst, desc) \
		do { \
		memcpy(mem, desc, (desc)->bLength); \
		*(dst)++ = mem; \
		mem += (desc)->bLength; \
		} while (0);

		#define UVC_COPY_DESCRIPTORS(mem, dst, src) \
		do { \
		const struct usb_descriptor_header * const *__src; \
		for (__src = src; *__src; ++__src) { \
		memcpy(mem, __src, (__src)->bLength); \
		*dst++ = mem; \
		mem += (*__src)->bLength; \
		} \
		} while (0)

		static struct usb_descriptor_header ** __init
		uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
		{
		struct uvc_input_header_descriptor *uvc_streaming_header;
		struct uvc_header_descriptor *uvc_control_header;
		const struct uvc_descriptor_header * const *uvc_streaming_cls;
		const struct usb_descriptor_header * const *uvc_streaming_std;
		const struct usb_descriptor_header * const *src;
		struct usb_descriptor_header **dst;
		struct usb_descriptor_header **hdr;
		unsigned int control_size;
		unsigned int streaming_size;
		unsigned int n_desc;
		unsigned int bytes;
		void *mem;

		uvc_streaming_cls = (speed == USB_SPEED_FULL)
		? uvc->desc.fs_streaming : uvc->desc.hs_streaming;
		uvc_streaming_std = (speed == USB_SPEED_FULL)
		? uvc_fs_streaming : uvc_hs_streaming;

		/* Descriptors layout
		*
		* uvc_iad
		* uvc_control_intf
		* Class-specific UVC control descriptors
		* uvc_control_ep
		* uvc_control_cs_ep
		* uvc_streaming_intf_alt0
		* Class-specific UVC streaming descriptors
		* uvc_{fs\|hs}_streaming
		*/

		/* Count descriptors and compute their size. */
		control_size = 0;
		streaming_size = 0;
		bytes = uvc_iad.bLength + uvc_control_intf.bLength
		+ uvc_control_ep.bLength + uvc_control_cs_ep.bLength
		+ uvc_streaming_intf_alt0.bLength;
		n_desc = 5;

		for (src = (const struct usb_descriptor_header*)uvc->desc.control; src; ++src) {
		control_size += (*src)->bLength;
		bytes += (*src)->bLength;
		n_desc++;
		}
		for (src = (const struct usb_descriptor_header*)uvc_streaming_cls; src; ++src) {
		streaming_size += (*src)->bLength;
		bytes += (*src)->bLength;
		n_desc++;
		}
		for (src = uvc_streaming_std; *src; ++src) {
		bytes += (*src)->bLength;
		n_desc++;
		}

		mem = kmalloc((n_desc + 1) * sizeof(*src) + bytes, GFP_KERNEL);
		if (mem == NULL)
		return NULL;

		hdr = mem;
		dst = mem;
		mem += (n_desc + 1) * sizeof(*src);

		/* Copy the descriptors. */
		UVC_COPY_DESCRIPTOR(mem, dst, &uvc_iad);
		UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_intf);

		uvc_control_header = mem;
		UVC_COPY_DESCRIPTORS(mem, dst,
		(const struct usb_descriptor_header**)uvc->desc.control);
		uvc_control_header->wTotalLength = cpu_to_le16(control_size);
		uvc_control_header->bInCollection = 1;
		uvc_control_header->baInterfaceNr[0] = uvc->streaming_intf;

		UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_ep);
		UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_cs_ep);
		UVC_COPY_DESCRIPTOR(mem, dst, &uvc_streaming_intf_alt0);

		uvc_streaming_header = mem;
		UVC_COPY_DESCRIPTORS(mem, dst,
		(const struct usb_descriptor_header**)uvc_streaming_cls);
		uvc_streaming_header->wTotalLength = cpu_to_le16(streaming_size);
		uvc_streaming_header->bEndpointAddress = uvc_streaming_ep.bEndpointAddress;

		UVC_COPY_DESCRIPTORS(mem, dst, uvc_streaming_std);

		*dst = NULL;
		return hdr;
		}

		static void
		uvc_function_unbind(struct usb_configuration c, struct usb_function f)
		{
		struct usb_composite_dev *cdev = c->cdev;
		struct uvc_device *uvc = to_uvc(f);

		INFO(cdev, "uvc_function_unbind\n");

		if (uvc->vdev) {
		if (uvc->vdev->minor == -1)
		video_device_release(uvc->vdev);
		else
		video_unregister_device(uvc->vdev);
		uvc->vdev = NULL;
		}

		if (uvc->control_ep)
		uvc->control_ep->driver_data = NULL;
		if (uvc->video.ep)
		uvc->video.ep->driver_data = NULL;

		if (uvc->control_req) {
		usb_ep_free_request(cdev->gadget->ep0, uvc->control_req);
		kfree(uvc->control_buf);
		}

		kfree(f->descriptors);
		kfree(f->hs_descriptors);

		kfree(uvc);
		}

		static int __init
		uvc_function_bind(struct usb_configuration c, struct usb_function f)
		{
		struct usb_composite_dev *cdev = c->cdev;
		struct uvc_device *uvc = to_uvc(f);
		struct usb_ep *ep;
		int ret = -EINVAL;

		INFO(cdev, "uvc_function_bind\n");

		/* Allocate endpoints. */
		ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep);
		if (!ep) {
		INFO(cdev, "Unable to allocate control EP\n");
		goto error;
		}
		uvc->control_ep = ep;
		ep->driver_data = uvc;

		ep = usb_ep_autoconfig(cdev->gadget, &uvc_streaming_ep);
		if (!ep) {
		INFO(cdev, "Unable to allocate streaming EP\n");
		goto error;
		}
		uvc->video.ep = ep;
		ep->driver_data = uvc;

		/* Allocate interface IDs. */
		if ((ret = usb_interface_id(c, f)) < 0)
		goto error;
		uvc_iad.bFirstInterface = ret;
		uvc_control_intf.bInterfaceNumber = ret;
		uvc->control_intf = ret;

		if ((ret = usb_interface_id(c, f)) < 0)
		goto error;
		uvc_streaming_intf_alt0.bInterfaceNumber = ret;
		uvc_streaming_intf_alt1.bInterfaceNumber = ret;
		uvc->streaming_intf = ret;

		/* Copy descriptors. */
		f->descriptors = uvc_copy_descriptors(uvc, USB_SPEED_FULL);
		f->hs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_HIGH);

		/* Preallocate control endpoint request. */
		uvc->control_req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL);
		uvc->control_buf = kmalloc(UVC_MAX_REQUEST_SIZE, GFP_KERNEL);
		if (uvc->control_req == NULL \|\| uvc->control_buf == NULL) {
		ret = -ENOMEM;
		goto error;
		}

		uvc->control_req->buf = uvc->control_buf;
		uvc->control_req->complete = uvc_function_ep0_complete;
		uvc->control_req->context = uvc;

		/* Avoid letting this gadget enumerate until the userspace server is
		* active.
		*/
		if ((ret = usb_function_deactivate(f)) < 0)
		goto error;

		/* Initialise video. */
		ret = uvc_video_init(&uvc->video);
		if (ret < 0)
		goto error;

		/* Register a V4L2 device. */
		ret = uvc_register_video(uvc);
		if (ret < 0) {
		printk(KERN_INFO "Unable to register video device\n");
		goto error;
		}

		return 0;

		error:
		uvc_function_unbind(c, f);
		return ret;
		}

		/* --------------------------------------------------------------------------
		* USB gadget function
		*/

		/**
		* uvc_bind_config - add a UVC function to a configuration
		* @c: the configuration to support the UVC instance
		* Context: single threaded during gadget setup
		*
		* Returns zero on success, else negative errno.
		*
		* Caller must have called @uvc_setup(). Caller is also responsible for
		* calling @uvc_cleanup() before module unload.
		*/
		int __init
		uvc_bind_config(struct usb_configuration *c,
		const struct uvc_descriptor_header * const *control,
		const struct uvc_descriptor_header * const *fs_streaming,
		const struct uvc_descriptor_header * const *hs_streaming)
		{
		struct uvc_device *uvc;
		int ret = 0;

		/* TODO Check if the USB device controller supports the required
		* features.
		*/
		if (!gadget_is_dualspeed(c->cdev->gadget))
		return -EINVAL;

		uvc = kzalloc(sizeof(*uvc), GFP_KERNEL);
		if (uvc == NULL)
		return -ENOMEM;

		uvc->state = UVC_STATE_DISCONNECTED;

		/* Validate the descriptors. */
		if (control == NULL \|\| control[0] == NULL \|\|
		control[0]->bDescriptorSubType != UVC_DT_HEADER)
		goto error;

		if (fs_streaming == NULL \|\| fs_streaming[0] == NULL \|\|
		fs_streaming[0]->bDescriptorSubType != UVC_DT_INPUT_HEADER)
		goto error;

		if (hs_streaming == NULL \|\| hs_streaming[0] == NULL \|\|
		hs_streaming[0]->bDescriptorSubType != UVC_DT_INPUT_HEADER)
		goto error;

		uvc->desc.control = control;
		uvc->desc.fs_streaming = fs_streaming;
		uvc->desc.hs_streaming = hs_streaming;

		/* Allocate string descriptor numbers. */
		if ((ret = usb_string_id(c->cdev)) < 0)
		goto error;
		uvc_en_us_strings[UVC_STRING_ASSOCIATION_IDX].id = ret;
		uvc_iad.iFunction = ret;

		if ((ret = usb_string_id(c->cdev)) < 0)
		goto error;
		uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id = ret;
		uvc_control_intf.iInterface = ret;

		if ((ret = usb_string_id(c->cdev)) < 0)
		goto error;
		uvc_en_us_strings[UVC_STRING_STREAMING_IDX].id = ret;
		uvc_streaming_intf_alt0.iInterface = ret;
		uvc_streaming_intf_alt1.iInterface = ret;

		/* Register the function. */
		uvc->func.name = "uvc";
		uvc->func.strings = uvc_function_strings;
		uvc->func.bind = uvc_function_bind;
		uvc->func.unbind = uvc_function_unbind;
		uvc->func.get_alt = uvc_function_get_alt;
		uvc->func.set_alt = uvc_function_set_alt;
		uvc->func.disable = uvc_function_disable;
		uvc->func.setup = uvc_function_setup;

		ret = usb_add_function(c, &uvc->func);
		if (ret)
		kfree(uvc);

		return 0;

		error:
		kfree(uvc);
		return ret;
		}

		module_param_named(trace, uvc_trace_param, uint, S_IRUGO\|S_IWUSR);
		MODULE_PARM_DESC(trace, "Trace level bitmask");

drivers/usb/gadget/f_uvc.h

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+376 −0

File added.

Preview size limit exceeded, changes collapsed.

drivers/usb/gadget/uvc.h

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+241 −0

Original line number	Diff line number	Diff line
		/*
		* uvc_gadget.h -- USB Video Class Gadget driver
		*
		* Copyright (C) 2009-2010
		* Laurent Pinchart (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.
		*
		*/

		#ifndef _UVC_GADGET_H_
		#define _UVC_GADGET_H_

		#include <linux/ioctl.h>
		#include <linux/types.h>
		#include <linux/usb/ch9.h>

		#define UVC_EVENT_FIRST (V4L2_EVENT_PRIVATE_START + 0)
		#define UVC_EVENT_CONNECT (V4L2_EVENT_PRIVATE_START + 0)
		#define UVC_EVENT_DISCONNECT (V4L2_EVENT_PRIVATE_START + 1)
		#define UVC_EVENT_STREAMON (V4L2_EVENT_PRIVATE_START + 2)
		#define UVC_EVENT_STREAMOFF (V4L2_EVENT_PRIVATE_START + 3)
		#define UVC_EVENT_SETUP (V4L2_EVENT_PRIVATE_START + 4)
		#define UVC_EVENT_DATA (V4L2_EVENT_PRIVATE_START + 5)
		#define UVC_EVENT_LAST (V4L2_EVENT_PRIVATE_START + 5)

		struct uvc_request_data
		{
		unsigned int length;
		__u8 data[60];
		};

		struct uvc_event
		{
		union {
		enum usb_device_speed speed;
		struct usb_ctrlrequest req;
		struct uvc_request_data data;
		};
		};

		#define UVCIOC_SEND_RESPONSE _IOW('U', 1, struct uvc_request_data)

		#define UVC_INTF_CONTROL 0
		#define UVC_INTF_STREAMING 1

		/* ------------------------------------------------------------------------
		* UVC constants & structures
		*/

		/* Values for bmHeaderInfo (Video and Still Image Payload Headers, 2.4.3.3) */
		#define UVC_STREAM_EOH (1 << 7)
		#define UVC_STREAM_ERR (1 << 6)
		#define UVC_STREAM_STI (1 << 5)
		#define UVC_STREAM_RES (1 << 4)
		#define UVC_STREAM_SCR (1 << 3)
		#define UVC_STREAM_PTS (1 << 2)
		#define UVC_STREAM_EOF (1 << 1)
		#define UVC_STREAM_FID (1 << 0)

		struct uvc_streaming_control {
		__u16 bmHint;
		__u8 bFormatIndex;
		__u8 bFrameIndex;
		__u32 dwFrameInterval;
		__u16 wKeyFrameRate;
		__u16 wPFrameRate;
		__u16 wCompQuality;
		__u16 wCompWindowSize;
		__u16 wDelay;
		__u32 dwMaxVideoFrameSize;
		__u32 dwMaxPayloadTransferSize;
		__u32 dwClockFrequency;
		__u8 bmFramingInfo;
		__u8 bPreferedVersion;
		__u8 bMinVersion;
		__u8 bMaxVersion;
		} __attribute__((__packed__));

		/* ------------------------------------------------------------------------
		* Debugging, printing and logging
		*/

		#ifdef __KERNEL__

		#include <linux/usb.h> /* For usb_endpoint_* */
		#include <linux/usb/gadget.h>
		#include <linux/videodev2.h>
		#include <media/v4l2-fh.h>

		#include "uvc_queue.h"

		#define UVC_TRACE_PROBE (1 << 0)
		#define UVC_TRACE_DESCR (1 << 1)
		#define UVC_TRACE_CONTROL (1 << 2)
		#define UVC_TRACE_FORMAT (1 << 3)
		#define UVC_TRACE_CAPTURE (1 << 4)
		#define UVC_TRACE_CALLS (1 << 5)
		#define UVC_TRACE_IOCTL (1 << 6)
		#define UVC_TRACE_FRAME (1 << 7)
		#define UVC_TRACE_SUSPEND (1 << 8)
		#define UVC_TRACE_STATUS (1 << 9)

		#define UVC_WARN_MINMAX 0
		#define UVC_WARN_PROBE_DEF 1

		extern unsigned int uvc_trace_param;

		#define uvc_trace(flag, msg...) \
		do { \
		if (uvc_trace_param & flag) \
		printk(KERN_DEBUG "uvcvideo: " msg); \
		} while (0)

		#define uvc_warn_once(dev, warn, msg...) \
		do { \
		if (!test_and_set_bit(warn, &dev->warnings)) \
		printk(KERN_INFO "uvcvideo: " msg); \
		} while (0)

		#define uvc_printk(level, msg...) \
		printk(level "uvcvideo: " msg)

		/* ------------------------------------------------------------------------
		* Driver specific constants
		*/

		#define DRIVER_VERSION "0.1.0"
		#define DRIVER_VERSION_NUMBER KERNEL_VERSION(0, 1, 0)

		#define DMA_ADDR_INVALID (~(dma_addr_t)0)

		#define UVC_NUM_REQUESTS 4
		#define UVC_MAX_REQUEST_SIZE 64
		#define UVC_MAX_EVENTS 4

		#define USB_DT_INTERFACE_ASSOCIATION_SIZE 8
		#define USB_CLASS_MISC 0xef

		/* ------------------------------------------------------------------------
		* Structures
		*/

		struct uvc_video
		{
		struct usb_ep *ep;

		/* Frame parameters */
		u8 bpp;
		u32 fcc;
		unsigned int width;
		unsigned int height;
		unsigned int imagesize;

		/* Requests */
		unsigned int req_size;
		struct usb_request *req[UVC_NUM_REQUESTS];
		__u8 *req_buffer[UVC_NUM_REQUESTS];
		struct list_head req_free;
		spinlock_t req_lock;

		void (encode) (struct usb_request req, struct uvc_video *video,
		struct uvc_buffer *buf);

		/* Context data used by the completion handler */
		__u32 payload_size;
		__u32 max_payload_size;

		struct uvc_video_queue queue;
		unsigned int fid;
		};

		enum uvc_state
		{
		UVC_STATE_DISCONNECTED,
		UVC_STATE_CONNECTED,
		UVC_STATE_STREAMING,
		};

		struct uvc_device
		{
		struct video_device *vdev;
		enum uvc_state state;
		struct usb_function func;
		struct uvc_video video;

		/* Descriptors */
		struct {
		const struct uvc_descriptor_header * const *control;
		const struct uvc_descriptor_header * const *fs_streaming;
		const struct uvc_descriptor_header * const *hs_streaming;
		} desc;

		unsigned int control_intf;
		struct usb_ep *control_ep;
		struct usb_request *control_req;
		void *control_buf;

		unsigned int streaming_intf;

		/* Events */
		unsigned int event_length;
		unsigned int event_setup_out : 1;
		};

		static inline struct uvc_device to_uvc(struct usb_function f)
		{
		return container_of(f, struct uvc_device, func);
		}

		struct uvc_file_handle
		{
		struct v4l2_fh vfh;
		struct uvc_video *device;
		};

		#define to_uvc_file_handle(handle) \
		container_of(handle, struct uvc_file_handle, vfh)

		extern struct v4l2_file_operations uvc_v4l2_fops;

		/* ------------------------------------------------------------------------
		* Functions
		*/

		extern int uvc_video_enable(struct uvc_video *video, int enable);
		extern int uvc_video_init(struct uvc_video *video);
		extern int uvc_video_pump(struct uvc_video *video);

		extern void uvc_endpoint_stream(struct uvc_device *dev);

		extern void uvc_function_connect(struct uvc_device *uvc);
		extern void uvc_function_disconnect(struct uvc_device *uvc);

		#endif /* __KERNEL__ */

		#endif /* _UVC_GADGET_H_ */

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