xref: /kernel/linux/linux-6.6/drivers/usb/gadget/legacy/webcam.c (revision 62306a36)

// SPDX-License-Identifier: GPL-2.0+
/*
 *	webcam.c -- USB webcam gadget driver
 *
 *	Copyright (C) 2009-2010
 *	    Laurent Pinchart (laurent.pinchart@ideasonboard.com)
 */

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/usb/video.h>

#include "u_uvc.h"
#include "uvc_configfs.h"

USB_GADGET_COMPOSITE_OPTIONS();

/*-------------------------------------------------------------------------*/

/* module parameters specific to the Video streaming endpoint */
static unsigned int streaming_interval = 1;
module_param(streaming_interval, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(streaming_interval, "1 - 16");

static unsigned int streaming_maxpacket = 1024;
module_param(streaming_maxpacket, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(streaming_maxpacket, "1 - 1023 (FS), 1 - 3072 (hs/ss)");

static unsigned int streaming_maxburst;
module_param(streaming_maxburst, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(streaming_maxburst, "0 - 15 (ss only)");

/* --------------------------------------------------------------------------
 * Device descriptor
 */

#define WEBCAM_VENDOR_ID		0x1d6b	/* Linux Foundation */
#define WEBCAM_PRODUCT_ID		0x0102	/* Webcam A/V gadget */
#define WEBCAM_DEVICE_BCD		0x0010	/* 0.10 */

static char webcam_vendor_label[] = "Linux Foundation";
static char webcam_product_label[] = "Webcam gadget";
static char webcam_config_label[] = "Video";

/* string IDs are assigned dynamically */

#define STRING_DESCRIPTION_IDX		USB_GADGET_FIRST_AVAIL_IDX

static struct usb_string webcam_strings[] = {
	[USB_GADGET_MANUFACTURER_IDX].s = webcam_vendor_label,
	[USB_GADGET_PRODUCT_IDX].s = webcam_product_label,
	[USB_GADGET_SERIAL_IDX].s = "",
	[STRING_DESCRIPTION_IDX].s = webcam_config_label,
	{  }
};

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

static struct usb_gadget_strings *webcam_device_strings[] = {
	&webcam_stringtab,
	NULL,
};

static struct usb_function_instance *fi_uvc;
static struct usb_function *f_uvc;

static struct usb_device_descriptor webcam_device_descriptor = {
	.bLength		= USB_DT_DEVICE_SIZE,
	.bDescriptorType	= USB_DT_DEVICE,
	/* .bcdUSB = DYNAMIC */
	.bDeviceClass		= USB_CLASS_MISC,
	.bDeviceSubClass	= 0x02,
	.bDeviceProtocol	= 0x01,
	.bMaxPacketSize0	= 0, /* dynamic */
	.idVendor		= cpu_to_le16(WEBCAM_VENDOR_ID),
	.idProduct		= cpu_to_le16(WEBCAM_PRODUCT_ID),
	.bcdDevice		= cpu_to_le16(WEBCAM_DEVICE_BCD),
	.iManufacturer		= 0, /* dynamic */
	.iProduct		= 0, /* dynamic */
	.iSerialNumber		= 0, /* dynamic */
	.bNumConfigurations	= 0, /* dynamic */
};

static const struct UVC_HEADER_DESCRIPTOR(1) uvc_control_header = {
	.bLength		= UVC_DT_HEADER_SIZE(1),
	.bDescriptorType	= USB_DT_CS_INTERFACE,
	.bDescriptorSubType	= UVC_VC_HEADER,
	.bcdUVC			= cpu_to_le16(0x0110),
	.wTotalLength		= 0, /* dynamic */
	.dwClockFrequency	= cpu_to_le32(48000000),
	.bInCollection		= 0, /* dynamic */
	.baInterfaceNr[0]	= 0, /* dynamic */
};

static const struct uvc_camera_terminal_descriptor uvc_camera_terminal = {
	.bLength		= UVC_DT_CAMERA_TERMINAL_SIZE(3),
	.bDescriptorType	= USB_DT_CS_INTERFACE,
	.bDescriptorSubType	= UVC_VC_INPUT_TERMINAL,
	.bTerminalID		= 1,
	.wTerminalType		= cpu_to_le16(0x0201),
	.bAssocTerminal		= 0,
	.iTerminal		= 0,
	.wObjectiveFocalLengthMin	= cpu_to_le16(0),
	.wObjectiveFocalLengthMax	= cpu_to_le16(0),
	.wOcularFocalLength		= cpu_to_le16(0),
	.bControlSize		= 3,
	.bmControls[0]		= 2,
	.bmControls[1]		= 0,
	.bmControls[2]		= 0,
};

static const struct uvc_processing_unit_descriptor uvc_processing = {
	.bLength		= UVC_DT_PROCESSING_UNIT_SIZE(2),
	.bDescriptorType	= USB_DT_CS_INTERFACE,
	.bDescriptorSubType	= UVC_VC_PROCESSING_UNIT,
	.bUnitID		= 2,
	.bSourceID		= 1,
	.wMaxMultiplier		= cpu_to_le16(16*1024),
	.bControlSize		= 2,
	.bmControls[0]		= 1,
	.bmControls[1]		= 0,
	.iProcessing		= 0,
	.bmVideoStandards	= 0,
};

static const struct uvc_output_terminal_descriptor uvc_output_terminal = {
	.bLength		= UVC_DT_OUTPUT_TERMINAL_SIZE,
	.bDescriptorType	= USB_DT_CS_INTERFACE,
	.bDescriptorSubType	= UVC_VC_OUTPUT_TERMINAL,
	.bTerminalID		= 3,
	.wTerminalType		= cpu_to_le16(0x0101),
	.bAssocTerminal		= 0,
	.bSourceID		= 2,
	.iTerminal		= 0,
};

DECLARE_UVC_INPUT_HEADER_DESCRIPTOR(1, 2);

static const struct UVC_INPUT_HEADER_DESCRIPTOR(1, 2) uvc_input_header = {
	.bLength		= UVC_DT_INPUT_HEADER_SIZE(1, 2),
	.bDescriptorType	= USB_DT_CS_INTERFACE,
	.bDescriptorSubType	= UVC_VS_INPUT_HEADER,
	.bNumFormats		= 2,
	.wTotalLength		= 0, /* dynamic */
	.bEndpointAddress	= 0, /* dynamic */
	.bmInfo			= 0,
	.bTerminalLink		= 3,
	.bStillCaptureMethod	= 0,
	.bTriggerSupport	= 0,
	.bTriggerUsage		= 0,
	.bControlSize		= 1,
	.bmaControls[0][0]	= 0,
	.bmaControls[1][0]	= 4,
};

static const struct uvcg_color_matching uvcg_color_matching = {
	.desc = {
		.bLength		= UVC_DT_COLOR_MATCHING_SIZE,
		.bDescriptorType	= USB_DT_CS_INTERFACE,
		.bDescriptorSubType	= UVC_VS_COLORFORMAT,
		.bColorPrimaries	= 1,
		.bTransferCharacteristics	= 1,
		.bMatrixCoefficients	= 4,
	},
};

static struct uvcg_uncompressed uvcg_format_yuv = {
	.fmt = {
		.type			= UVCG_UNCOMPRESSED,
		/* add to .frames and fill .num_frames at runtime */
		.color_matching		= (struct uvcg_color_matching *)&uvcg_color_matching,
	},
	.desc = {
		.bLength		= UVC_DT_FORMAT_UNCOMPRESSED_SIZE,
		.bDescriptorType	= USB_DT_CS_INTERFACE,
		.bDescriptorSubType	= UVC_VS_FORMAT_UNCOMPRESSED,
		.bFormatIndex		= 1,
		.bNumFrameDescriptors	= 2,
		.guidFormat		= {
			'Y',  'U',  'Y',  '2', 0x00, 0x00, 0x10, 0x00,
			 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71
		},
		.bBitsPerPixel		= 16,
		.bDefaultFrameIndex	= 1,
		.bAspectRatioX		= 0,
		.bAspectRatioY		= 0,
		.bmInterlaceFlags	= 0,
		.bCopyProtect		= 0,
	},
};

static struct uvcg_format_ptr uvcg_format_ptr_yuv = {
	.fmt = &uvcg_format_yuv.fmt,
};

DECLARE_UVC_FRAME_UNCOMPRESSED(1);
DECLARE_UVC_FRAME_UNCOMPRESSED(3);

#define UVCG_WIDTH_360P			640
#define UVCG_HEIGHT_360P		360
#define UVCG_MIN_BITRATE_360P		18432000
#define UVCG_MAX_BITRATE_360P		55296000
#define UVCG_MAX_VIDEO_FB_SZ_360P	460800
#define UVCG_FRM_INTERV_0_360P		666666
#define UVCG_FRM_INTERV_1_360P		1000000
#define UVCG_FRM_INTERV_2_360P		5000000
#define UVCG_DEFAULT_FRM_INTERV_360P	UVCG_FRM_INTERV_0_360P

static const struct UVC_FRAME_UNCOMPRESSED(3) uvc_frame_yuv_360p = {
	.bLength		= UVC_DT_FRAME_UNCOMPRESSED_SIZE(3),
	.bDescriptorType	= USB_DT_CS_INTERFACE,
	.bDescriptorSubType	= UVC_VS_FRAME_UNCOMPRESSED,
	.bFrameIndex		= 1,
	.bmCapabilities		= 0,
	.wWidth			= cpu_to_le16(UVCG_WIDTH_360P),
	.wHeight		= cpu_to_le16(UVCG_HEIGHT_360P),
	.dwMinBitRate		= cpu_to_le32(UVCG_MIN_BITRATE_360P),
	.dwMaxBitRate		= cpu_to_le32(UVCG_MAX_BITRATE_360P),
	.dwMaxVideoFrameBufferSize	= cpu_to_le32(UVCG_MAX_VIDEO_FB_SZ_360P),
	.dwDefaultFrameInterval	= cpu_to_le32(UVCG_DEFAULT_FRM_INTERV_360P),
	.bFrameIntervalType	= 3,
	.dwFrameInterval[0]	= cpu_to_le32(UVCG_FRM_INTERV_0_360P),
	.dwFrameInterval[1]	= cpu_to_le32(UVCG_FRM_INTERV_1_360P),
	.dwFrameInterval[2]	= cpu_to_le32(UVCG_FRM_INTERV_2_360P),
};

static u32 uvcg_frame_yuv_360p_dw_frame_interval[] = {
	[0] = UVCG_FRM_INTERV_0_360P,
	[1] = UVCG_FRM_INTERV_1_360P,
	[2] = UVCG_FRM_INTERV_2_360P,
};

static const struct uvcg_frame uvcg_frame_yuv_360p = {
	.fmt_type		= UVCG_UNCOMPRESSED,
	.frame = {
		.b_length			= UVC_DT_FRAME_UNCOMPRESSED_SIZE(3),
		.b_descriptor_type		= USB_DT_CS_INTERFACE,
		.b_descriptor_subtype		= UVC_VS_FRAME_UNCOMPRESSED,
		.b_frame_index			= 1,
		.bm_capabilities		= 0,
		.w_width			= UVCG_WIDTH_360P,
		.w_height			= UVCG_HEIGHT_360P,
		.dw_min_bit_rate		= UVCG_MIN_BITRATE_360P,
		.dw_max_bit_rate		= UVCG_MAX_BITRATE_360P,
		.dw_max_video_frame_buffer_size	= UVCG_MAX_VIDEO_FB_SZ_360P,
		.dw_default_frame_interval	= UVCG_DEFAULT_FRM_INTERV_360P,
		.b_frame_interval_type		= 3,
	},
	.dw_frame_interval	= uvcg_frame_yuv_360p_dw_frame_interval,
};

static struct uvcg_frame_ptr uvcg_frame_ptr_yuv_360p = {
	.frm = (struct uvcg_frame *)&uvcg_frame_yuv_360p,
};
#define UVCG_WIDTH_720P			1280
#define UVCG_HEIGHT_720P		720
#define UVCG_MIN_BITRATE_720P		29491200
#define UVCG_MAX_BITRATE_720P		29491200
#define UVCG_MAX_VIDEO_FB_SZ_720P	1843200
#define UVCG_FRM_INTERV_0_720P		5000000
#define UVCG_DEFAULT_FRM_INTERV_720P	UVCG_FRM_INTERV_0_720P

static const struct UVC_FRAME_UNCOMPRESSED(1) uvc_frame_yuv_720p = {
	.bLength		= UVC_DT_FRAME_UNCOMPRESSED_SIZE(1),
	.bDescriptorType	= USB_DT_CS_INTERFACE,
	.bDescriptorSubType	= UVC_VS_FRAME_UNCOMPRESSED,
	.bFrameIndex		= 2,
	.bmCapabilities		= 0,
	.wWidth			= cpu_to_le16(UVCG_WIDTH_720P),
	.wHeight		= cpu_to_le16(UVCG_HEIGHT_720P),
	.dwMinBitRate		= cpu_to_le32(UVCG_MIN_BITRATE_720P),
	.dwMaxBitRate		= cpu_to_le32(UVCG_MAX_BITRATE_720P),
	.dwMaxVideoFrameBufferSize	= cpu_to_le32(UVCG_MAX_VIDEO_FB_SZ_720P),
	.dwDefaultFrameInterval	= cpu_to_le32(UVCG_DEFAULT_FRM_INTERV_720P),
	.bFrameIntervalType	= 1,
	.dwFrameInterval[0]	= cpu_to_le32(UVCG_FRM_INTERV_0_720P),
};

static u32 uvcg_frame_yuv_720p_dw_frame_interval[] = {
	[0] = UVCG_FRM_INTERV_0_720P,
};

static const struct uvcg_frame uvcg_frame_yuv_720p = {
	.fmt_type		= UVCG_UNCOMPRESSED,
	.frame = {
		.b_length			= UVC_DT_FRAME_UNCOMPRESSED_SIZE(1),
		.b_descriptor_type		= USB_DT_CS_INTERFACE,
		.b_descriptor_subtype		= UVC_VS_FRAME_UNCOMPRESSED,
		.b_frame_index			= 2,
		.bm_capabilities		= 0,
		.w_width			= UVCG_WIDTH_720P,
		.w_height			= UVCG_HEIGHT_720P,
		.dw_min_bit_rate		= UVCG_MIN_BITRATE_720P,
		.dw_max_bit_rate		= UVCG_MAX_BITRATE_720P,
		.dw_max_video_frame_buffer_size	= UVCG_MAX_VIDEO_FB_SZ_720P,
		.dw_default_frame_interval	= UVCG_DEFAULT_FRM_INTERV_720P,
		.b_frame_interval_type		= 1,
	},
	.dw_frame_interval	= uvcg_frame_yuv_720p_dw_frame_interval,
};

static struct uvcg_frame_ptr uvcg_frame_ptr_yuv_720p = {
	.frm = (struct uvcg_frame *)&uvcg_frame_yuv_720p,
};

static struct uvcg_mjpeg uvcg_format_mjpeg = {
	.fmt = {
		.type			= UVCG_MJPEG,
		/* add to .frames and fill .num_frames at runtime */
		.color_matching		= (struct uvcg_color_matching *)&uvcg_color_matching,
	},
	.desc = {
		.bLength		= UVC_DT_FORMAT_MJPEG_SIZE,
		.bDescriptorType	= USB_DT_CS_INTERFACE,
		.bDescriptorSubType	= UVC_VS_FORMAT_MJPEG,
		.bFormatIndex		= 2,
		.bNumFrameDescriptors	= 2,
		.bmFlags		= 0,
		.bDefaultFrameIndex	= 1,
		.bAspectRatioX		= 0,
		.bAspectRatioY		= 0,
		.bmInterlaceFlags	= 0,
		.bCopyProtect		= 0,
	},
};

static struct uvcg_format_ptr uvcg_format_ptr_mjpeg = {
	.fmt = &uvcg_format_mjpeg.fmt,
};

DECLARE_UVC_FRAME_MJPEG(1);
DECLARE_UVC_FRAME_MJPEG(3);

static const struct UVC_FRAME_MJPEG(3) uvc_frame_mjpg_360p = {
	.bLength		= UVC_DT_FRAME_MJPEG_SIZE(3),
	.bDescriptorType	= USB_DT_CS_INTERFACE,
	.bDescriptorSubType	= UVC_VS_FRAME_MJPEG,
	.bFrameIndex		= 1,
	.bmCapabilities		= 0,
	.wWidth			= cpu_to_le16(UVCG_WIDTH_360P),
	.wHeight		= cpu_to_le16(UVCG_HEIGHT_360P),
	.dwMinBitRate		= cpu_to_le32(UVCG_MIN_BITRATE_360P),
	.dwMaxBitRate		= cpu_to_le32(UVCG_MAX_BITRATE_360P),
	.dwMaxVideoFrameBufferSize	= cpu_to_le32(UVCG_MAX_VIDEO_FB_SZ_360P),
	.dwDefaultFrameInterval	= cpu_to_le32(UVCG_DEFAULT_FRM_INTERV_360P),
	.bFrameIntervalType	= 3,
	.dwFrameInterval[0]	= cpu_to_le32(UVCG_FRM_INTERV_0_360P),
	.dwFrameInterval[1]	= cpu_to_le32(UVCG_FRM_INTERV_1_360P),
	.dwFrameInterval[2]	= cpu_to_le32(UVCG_FRM_INTERV_2_360P),
};

static u32 uvcg_frame_mjpeg_360p_dw_frame_interval[] = {
	[0] = UVCG_FRM_INTERV_0_360P,
	[1] = UVCG_FRM_INTERV_1_360P,
	[2] = UVCG_FRM_INTERV_2_360P,
};

static const struct uvcg_frame uvcg_frame_mjpeg_360p = {
	.fmt_type		= UVCG_MJPEG,
	.frame = {
		.b_length			= UVC_DT_FRAME_MJPEG_SIZE(3),
		.b_descriptor_type		= USB_DT_CS_INTERFACE,
		.b_descriptor_subtype		= UVC_VS_FRAME_MJPEG,
		.b_frame_index			= 1,
		.bm_capabilities		= 0,
		.w_width			= UVCG_WIDTH_360P,
		.w_height			= UVCG_HEIGHT_360P,
		.dw_min_bit_rate		= UVCG_MIN_BITRATE_360P,
		.dw_max_bit_rate		= UVCG_MAX_BITRATE_360P,
		.dw_max_video_frame_buffer_size	= UVCG_MAX_VIDEO_FB_SZ_360P,
		.dw_default_frame_interval	= UVCG_DEFAULT_FRM_INTERV_360P,
		.b_frame_interval_type		= 3,
	},
	.dw_frame_interval	= uvcg_frame_mjpeg_360p_dw_frame_interval,
};

static struct uvcg_frame_ptr uvcg_frame_ptr_mjpeg_360p = {
	.frm = (struct uvcg_frame *)&uvcg_frame_mjpeg_360p,
};

static const struct UVC_FRAME_MJPEG(1) uvc_frame_mjpg_720p = {
	.bLength		= UVC_DT_FRAME_MJPEG_SIZE(1),
	.bDescriptorType	= USB_DT_CS_INTERFACE,
	.bDescriptorSubType	= UVC_VS_FRAME_MJPEG,
	.bFrameIndex		= 2,
	.bmCapabilities		= 0,
	.wWidth			= cpu_to_le16(UVCG_WIDTH_720P),
	.wHeight		= cpu_to_le16(UVCG_HEIGHT_720P),
	.dwMinBitRate		= cpu_to_le32(UVCG_MIN_BITRATE_720P),
	.dwMaxBitRate		= cpu_to_le32(UVCG_MAX_BITRATE_720P),
	.dwMaxVideoFrameBufferSize	= cpu_to_le32(UVCG_MAX_VIDEO_FB_SZ_720P),
	.dwDefaultFrameInterval	= cpu_to_le32(UVCG_DEFAULT_FRM_INTERV_720P),
	.bFrameIntervalType	= 1,
	.dwFrameInterval[0]	= cpu_to_le32(UVCG_FRM_INTERV_0_720P),
};

static u32 uvcg_frame_mjpeg_720p_dw_frame_interval[] = {
	[0] = UVCG_FRM_INTERV_0_720P,
};

static const struct uvcg_frame uvcg_frame_mjpeg_720p = {
	.fmt_type		= UVCG_MJPEG,
	.frame = {
		.b_length			= UVC_DT_FRAME_MJPEG_SIZE(1),
		.b_descriptor_type		= USB_DT_CS_INTERFACE,
		.b_descriptor_subtype		= UVC_VS_FRAME_MJPEG,
		.b_frame_index			= 2,
		.bm_capabilities		= 0,
		.w_width			= UVCG_WIDTH_720P,
		.w_height			= UVCG_HEIGHT_720P,
		.dw_min_bit_rate		= UVCG_MIN_BITRATE_720P,
		.dw_max_bit_rate		= UVCG_MAX_BITRATE_720P,
		.dw_max_video_frame_buffer_size	= UVCG_MAX_VIDEO_FB_SZ_720P,
		.dw_default_frame_interval	= UVCG_DEFAULT_FRM_INTERV_720P,
		.b_frame_interval_type		= 1,
	},
	.dw_frame_interval	= uvcg_frame_mjpeg_720p_dw_frame_interval,
};

static struct uvcg_frame_ptr uvcg_frame_ptr_mjpeg_720p = {
	.frm = (struct uvcg_frame *)&uvcg_frame_mjpeg_720p,
};

static struct uvcg_streaming_header uvcg_streaming_header = {
};

static const struct uvc_descriptor_header * const uvc_fs_control_cls[] = {
	(const struct uvc_descriptor_header *) &uvc_control_header,
	(const struct uvc_descriptor_header *) &uvc_camera_terminal,
	(const struct uvc_descriptor_header *) &uvc_processing,
	(const struct uvc_descriptor_header *) &uvc_output_terminal,
	NULL,
};

static const struct uvc_descriptor_header * const uvc_ss_control_cls[] = {
	(const struct uvc_descriptor_header *) &uvc_control_header,
	(const struct uvc_descriptor_header *) &uvc_camera_terminal,
	(const struct uvc_descriptor_header *) &uvc_processing,
	(const struct uvc_descriptor_header *) &uvc_output_terminal,
	NULL,
};

static const struct uvc_descriptor_header * const uvc_fs_streaming_cls[] = {
	(const struct uvc_descriptor_header *) &uvc_input_header,
	(const struct uvc_descriptor_header *) &uvcg_format_yuv.desc,
	(const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
	(const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
	(const struct uvc_descriptor_header *) &uvcg_color_matching.desc,
	(const struct uvc_descriptor_header *) &uvcg_format_mjpeg.desc,
	(const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
	(const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
	(const struct uvc_descriptor_header *) &uvcg_color_matching.desc,
	NULL,
};

static const struct uvc_descriptor_header * const uvc_hs_streaming_cls[] = {
	(const struct uvc_descriptor_header *) &uvc_input_header,
	(const struct uvc_descriptor_header *) &uvcg_format_yuv.desc,
	(const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
	(const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
	(const struct uvc_descriptor_header *) &uvcg_color_matching.desc,
	(const struct uvc_descriptor_header *) &uvcg_format_mjpeg.desc,
	(const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
	(const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
	(const struct uvc_descriptor_header *) &uvcg_color_matching.desc,
	NULL,
};

static const struct uvc_descriptor_header * const uvc_ss_streaming_cls[] = {
	(const struct uvc_descriptor_header *) &uvc_input_header,
	(const struct uvc_descriptor_header *) &uvcg_format_yuv.desc,
	(const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
	(const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
	(const struct uvc_descriptor_header *) &uvcg_color_matching.desc,
	(const struct uvc_descriptor_header *) &uvcg_format_mjpeg.desc,
	(const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
	(const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
	(const struct uvc_descriptor_header *) &uvcg_color_matching.desc,
	NULL,
};

/* --------------------------------------------------------------------------
 * USB configuration
 */

static int
webcam_config_bind(struct usb_configuration *c)
{
	int status = 0;

	f_uvc = usb_get_function(fi_uvc);
	if (IS_ERR(f_uvc))
		return PTR_ERR(f_uvc);

	status = usb_add_function(c, f_uvc);
	if (status < 0)
		usb_put_function(f_uvc);

	return status;
}

static struct usb_configuration webcam_config_driver = {
	.label			= webcam_config_label,
	.bConfigurationValue	= 1,
	.iConfiguration		= 0, /* dynamic */
	.bmAttributes		= USB_CONFIG_ATT_SELFPOWER,
	.MaxPower		= CONFIG_USB_GADGET_VBUS_DRAW,
};

static int
webcam_unbind(struct usb_composite_dev *cdev)
{
	if (!IS_ERR_OR_NULL(f_uvc))
		usb_put_function(f_uvc);
	if (!IS_ERR_OR_NULL(fi_uvc))
		usb_put_function_instance(fi_uvc);
	return 0;
}

static int
webcam_bind(struct usb_composite_dev *cdev)
{
	struct f_uvc_opts *uvc_opts;
	int ret;

	fi_uvc = usb_get_function_instance("uvc");
	if (IS_ERR(fi_uvc))
		return PTR_ERR(fi_uvc);

	uvc_opts = container_of(fi_uvc, struct f_uvc_opts, func_inst);

	uvc_opts->streaming_interval = streaming_interval;
	uvc_opts->streaming_maxpacket = streaming_maxpacket;
	uvc_opts->streaming_maxburst = streaming_maxburst;

	uvc_opts->fs_control = uvc_fs_control_cls;
	uvc_opts->ss_control = uvc_ss_control_cls;
	uvc_opts->fs_streaming = uvc_fs_streaming_cls;
	uvc_opts->hs_streaming = uvc_hs_streaming_cls;
	uvc_opts->ss_streaming = uvc_ss_streaming_cls;

	INIT_LIST_HEAD(&uvcg_format_yuv.fmt.frames);
	list_add_tail(&uvcg_frame_ptr_yuv_360p.entry, &uvcg_format_yuv.fmt.frames);
	list_add_tail(&uvcg_frame_ptr_yuv_720p.entry, &uvcg_format_yuv.fmt.frames);
	uvcg_format_yuv.fmt.num_frames = 2;

	INIT_LIST_HEAD(&uvcg_format_mjpeg.fmt.frames);
	list_add_tail(&uvcg_frame_ptr_mjpeg_360p.entry, &uvcg_format_mjpeg.fmt.frames);
	list_add_tail(&uvcg_frame_ptr_mjpeg_720p.entry, &uvcg_format_mjpeg.fmt.frames);
	uvcg_format_mjpeg.fmt.num_frames = 2;

	INIT_LIST_HEAD(&uvcg_streaming_header.formats);
	list_add_tail(&uvcg_format_ptr_yuv.entry, &uvcg_streaming_header.formats);
	list_add_tail(&uvcg_format_ptr_mjpeg.entry, &uvcg_streaming_header.formats);
	uvcg_streaming_header.num_fmt = 2;

	uvc_opts->header = &uvcg_streaming_header;

	/* Allocate string descriptor numbers ... note that string contents
	 * can be overridden by the composite_dev glue.
	 */
	ret = usb_string_ids_tab(cdev, webcam_strings);
	if (ret < 0)
		goto error;
	webcam_device_descriptor.iManufacturer =
		webcam_strings[USB_GADGET_MANUFACTURER_IDX].id;
	webcam_device_descriptor.iProduct =
		webcam_strings[USB_GADGET_PRODUCT_IDX].id;
	webcam_config_driver.iConfiguration =
		webcam_strings[STRING_DESCRIPTION_IDX].id;

	/* Register our configuration. */
	if ((ret = usb_add_config(cdev, &webcam_config_driver,
					webcam_config_bind)) < 0)
		goto error;

	usb_composite_overwrite_options(cdev, &coverwrite);
	INFO(cdev, "Webcam Video Gadget\n");
	return 0;

error:
	usb_put_function_instance(fi_uvc);
	return ret;
}

/* --------------------------------------------------------------------------
 * Driver
 */

static struct usb_composite_driver webcam_driver = {
	.name		= "g_webcam",
	.dev		= &webcam_device_descriptor,
	.strings	= webcam_device_strings,
	.max_speed	= USB_SPEED_SUPER,
	.bind		= webcam_bind,
	.unbind		= webcam_unbind,
};

module_usb_composite_driver(webcam_driver);

MODULE_AUTHOR("Laurent Pinchart");
MODULE_DESCRIPTION("Webcam Video Gadget");
MODULE_LICENSE("GPL");