/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * Gadget Function Driver for Android USB accessories
 *
 * Copyright 2011-2024 Google LLC
 *
 */

#ifndef _UAPI_ANDROID_ACCESSORY_H
#define _UAPI_ANDROID_ACCESSORY_H

/* Use Google Vendor ID when in accessory mode */
#define USB_ACCESSORY_VENDOR_ID 0x18D1

/* Product ID to use when in accessory mode */
#define USB_ACCESSORY_PRODUCT_ID 0x2D00

/* Product ID to use when in accessory mode and adb is enabled */
#define USB_ACCESSORY_ADB_PRODUCT_ID 0x2D01

/* Indexes for strings sent by the host via ACCESSORY_SEND_STRING */
#define ACCESSORY_STRING_MANUFACTURER	0
#define ACCESSORY_STRING_MODEL		1
#define ACCESSORY_STRING_DESCRIPTION	2
#define ACCESSORY_STRING_VERSION	3
#define ACCESSORY_STRING_URI		4
#define ACCESSORY_STRING_SERIAL		5

#define ACC_STRING_SIZE 256

/* Control request for retrieving device's protocol version
 *
 *	requestType:	USB_DIR_IN | USB_TYPE_VENDOR
 *	request:	ACCESSORY_GET_PROTOCOL
 *	value:		0
 *	index:		0
 *	data:		version number (16 bits little endian)
 *			1 for original accessory support
 *			2 adds HID and device to host audio support
 */
#define ACCESSORY_GET_PROTOCOL		51

/* Control request for host to send a string to the device
 *
 *	requestType:	USB_DIR_OUT | USB_TYPE_VENDOR
 *	request:	ACCESSORY_SEND_STRING
 *	value:		0
 *	index:		string ID
 *	data:		zero terminated UTF8 string
 *
 *  The device can later retrieve these strings via the
 *  ACCESSORY_GET_STRING_* ioctls
 */
#define ACCESSORY_SEND_STRING		52

/* Control request for starting device in accessory mode.
 * The host sends this after setting all its strings to the device.
 *
 *	requestType:	USB_DIR_OUT | USB_TYPE_VENDOR
 *	request:	ACCESSORY_START
 *	value:		0
 *	index:		0
 *	data:		none
 */
#define ACCESSORY_START			53

/* Control request for registering a HID device.
 * Upon registering, a unique ID is sent by the accessory in the
 * value parameter. This ID will be used for future commands for
 * the device
 *
 *	requestType:	USB_DIR_OUT | USB_TYPE_VENDOR
 *	request:	ACCESSORY_REGISTER_HID_DEVICE
 *	value:		Accessory assigned ID for the HID device
 *	index:		total length of the HID report descriptor
 *	data:		none
 */
#define ACCESSORY_REGISTER_HID		54

/* Control request for unregistering a HID device.
 *
 *	requestType:	USB_DIR_OUT | USB_TYPE_VENDOR
 *	request:	ACCESSORY_REGISTER_HID
 *	value:		Accessory assigned ID for the HID device
 *	index:		0
 *	data:		none
 */
#define ACCESSORY_UNREGISTER_HID	55

/* Control request for sending the HID report descriptor.
 * If the HID descriptor is longer than the endpoint zero max packet size,
 * the descriptor will be sent in multiple ACCESSORY_SET_HID_REPORT_DESC
 * commands. The data for the descriptor must be sent sequentially
 * if multiple packets are needed.
 *
 *	requestType:	USB_DIR_OUT | USB_TYPE_VENDOR
 *	request:	ACCESSORY_SET_HID_REPORT_DESC
 *	value:		Accessory assigned ID for the HID device
 *	index:		offset of data in descriptor
 *			(needed when HID descriptor is too big for one packet)
 *	data:		the HID report descriptor
 */
#define ACCESSORY_SET_HID_REPORT_DESC	56

/* Control request for sending HID events.
 *
 *	requestType:	USB_DIR_OUT | USB_TYPE_VENDOR
 *	request:	ACCESSORY_SEND_HID_EVENT
 *	value:		Accessory assigned ID for the HID device
 *	index:		0
 *	data:		the HID report for the event
 */
#define ACCESSORY_SEND_HID_EVENT	57

/* Control request for setting the audio mode.
 *
 *	DEPRECATED! Do not implement a new device which uses this.
 *
 *	requestType:	USB_DIR_OUT | USB_TYPE_VENDOR
 *	request:	ACCESSORY_SET_AUDIO_MODE
 *	value:		0 - no audio
 *			1 - device to host, 44100 16-bit stereo PCM
 *	index:		0
 *	data:		none
 */
#define ACCESSORY_SET_AUDIO_MODE	58

/* ioctls for retrieving strings set by the host */
#define ACCESSORY_GET_STRING_MANUFACTURER   _IOW('M', 1, char[ACC_STRING_SIZE])
#define ACCESSORY_GET_STRING_MODEL          _IOW('M', 2, char[ACC_STRING_SIZE])
#define ACCESSORY_GET_STRING_DESCRIPTION    _IOW('M', 3, char[ACC_STRING_SIZE])
#define ACCESSORY_GET_STRING_VERSION        _IOW('M', 4, char[ACC_STRING_SIZE])
#define ACCESSORY_GET_STRING_URI            _IOW('M', 5, char[ACC_STRING_SIZE])
#define ACCESSORY_GET_STRING_SERIAL         _IOW('M', 6, char[ACC_STRING_SIZE])
/* returns 1 if there is a start request pending */
#define ACCESSORY_IS_START_REQUESTED        _IO('M', 7)
/* returns audio mode (set via the ACCESSORY_SET_AUDIO_MODE control request) */
#define ACCESSORY_GET_AUDIO_MODE            _IO('M', 8)

#endif /* _UAPI_ANDROID__ACCESSORY_H */