/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 *
 * USB definitions.
 */

#ifndef __CROS_EC_USB_DESCRIPTOR_H
#define __CROS_EC_USB_DESCRIPTOR_H

#include <stddef.h> /* for wchar_t */

#define USB_MAX_PACKET_SIZE 64

/* USB 2.0 chapter 9 definitions */

/* Descriptor types */
#define USB_DT_DEVICE                     0x01
#define USB_DT_CONFIGURATION              0x02
#define USB_DT_STRING                     0x03
#define USB_DT_INTERFACE                  0x04
#define USB_DT_ENDPOINT                   0x05
#define USB_DT_DEVICE_QUALIFIER           0x06
#define USB_DT_OTHER_SPEED_CONFIG         0x07
#define USB_DT_INTERFACE_POWER            0x08
#define USB_DT_DEBUG                      0x0a
#define USB_DT_BOS                        0x0f
#define USB_DT_DEVICE_CAPABILITY          0x10

/* USB Device Descriptor */
struct usb_device_descriptor {
	uint8_t bLength;
	uint8_t bDescriptorType;
	uint16_t bcdUSB;
	uint8_t bDeviceClass;
	uint8_t bDeviceSubClass;
	uint8_t bDeviceProtocol;
	uint8_t bMaxPacketSize0;
	uint16_t idVendor;
	uint16_t idProduct;
	uint16_t bcdDevice;
	uint8_t iManufacturer;
	uint8_t iProduct;
	uint8_t iSerialNumber;
	uint8_t bNumConfigurations;
} __packed;
#define USB_DT_DEVICE_SIZE                18

/* BOS Descriptor ( USB3.1 rev1 Section 9.6.2 ) */
struct bos_context {
	void *descp;
	int size;
};

struct usb_bos_hdr_descriptor {
	uint8_t bLength;
	uint8_t bDescriptorType; /* USB_DT_BOS */
	uint16_t wTotalLength;   /* Total length of of hdr + all dev caps */
	uint8_t bNumDeviceCaps;  /* Container ID Descriptor + others */
} __packed;
#define USB_DT_BOS_SIZE 5

/* Container ID Descriptor */
struct usb_contid_caps_descriptor {
	uint8_t  bLength;
	uint8_t  bDescriptorType;     /* USB_DT_DEVICE_CAPABILITY */
	uint8_t  bDevCapabilityType;  /* USB_DC_DTYPE_xxx */
	uint8_t  bReserved;           /* SBZ */
	uint8_t  ContainerID[16];     /* UUID */
} __packed;
#define USB_DT_CONTID_SIZE         20

/* Device Cap Type Codes ( offset 2 of Device Capability Descriptor */
#define USB_DC_DTYPE_WIRELESS  0x01
#define USB_DC_DTYPE_USB20EXT  0x02
#define USB_DC_DTYPE_USBSS     0x03
#define USB_DC_DTYPE_CONTID    0x04
#define USB_DC_DTYPE_PLATFORM  0x05
#define USB_DC_DTYPE_PD        0x06
#define USB_DC_DTYPE_BATTINFO  0x07
#define USB_DC_DTYPE_CONSUMER  0x08
#define USB_DC_DTYPE_PRODUCER  0x09
#define USB_DC_DTYPE_USBSSP    0x0a
#define USB_DC_DTYPE_PCSTIME   0x0b
#define USB_DC_DTYPE_WUSBEXT   0x0c
#define USB_DC_DTYPE_BILLBOARD 0x0d
/* RESERVED 0x00, 0xOe - 0xff */

/* Platform descriptor */
struct usb_platform_descriptor {
	uint8_t  bLength;
	uint8_t  bDescriptorType;     /* USB_DT_DEVICE_CAPABILITY */
	uint8_t  bDevCapabilityType;  /* USB_DC_DTYPE_PLATFORM */
	uint8_t  bReserved;           /* SBZ */
	uint8_t  PlatformCapUUID[16]; /* USB_PLAT_CAP_xxx */
	uint16_t bcdVersion;          /* 0x0100 */
	uint8_t  bVendorCode;
	uint8_t  iLandingPage;
} __packed;
#define USB_DT_PLATFORM_SIZE   24

/* Platform Capability UUIDs */
#define USB_PLAT_CAP_WEBUSB /*{3408b638-09a9-47a0-8bfd-a0768815b665}*/ \
	{0x38, 0xB6, 0x08, 0x34, 0xA9, 0x09, 0xA0, 0x47,               \
	 0x8B, 0xFD, 0xA0, 0x76, 0x88, 0x15, 0xB6, 0x65}

/* Qualifier Descriptor */
struct usb_qualifier_descriptor {
	uint8_t  bLength;
	uint8_t  bDescriptorType;
	uint16_t bcdUSB;
	uint8_t  bDeviceClass;
	uint8_t  bDeviceSubClass;
	uint8_t  bDeviceProtocol;
	uint8_t  bMaxPacketSize0;
	uint8_t  bNumConfigurations;
	uint8_t  bReserved;
} __packed;
#define USB_DT_QUALIFIER_SIZE		10

/* Configuration Descriptor */
struct usb_config_descriptor {
	uint8_t  bLength;
	uint8_t  bDescriptorType;
	uint16_t wTotalLength;
	uint8_t  bNumInterfaces;
	uint8_t  bConfigurationValue;
	uint8_t  iConfiguration;
	uint8_t  bmAttributes;
	uint8_t  bMaxPower;
} __packed;
#define USB_DT_CONFIG_SIZE                9

/* String Descriptor */
struct usb_string_descriptor {
	uint8_t  bLength;
	uint8_t  bDescriptorType;
	uint16_t wData[1];
} __packed;

/* Interface Descriptor */
struct usb_interface_descriptor {
	uint8_t  bLength;
	uint8_t  bDescriptorType;
	uint8_t  bInterfaceNumber;
	uint8_t  bAlternateSetting;
	uint8_t  bNumEndpoints;
	uint8_t  bInterfaceClass;
	uint8_t  bInterfaceSubClass;
	uint8_t  bInterfaceProtocol;
	uint8_t  iInterface;
} __packed;
#define USB_DT_INTERFACE_SIZE           9

/* Endpoint Descriptor */
struct usb_endpoint_descriptor {
	uint8_t  bLength;
	uint8_t  bDescriptorType;
	uint8_t  bEndpointAddress;
	uint8_t  bmAttributes;
	uint16_t wMaxPacketSize;
	uint8_t  bInterval;
} __packed;
#define USB_DT_ENDPOINT_SIZE            7

/* USB Class codes */
#define USB_CLASS_PER_INTERFACE           0x00
#define USB_CLASS_AUDIO                   0x01
#define USB_CLASS_COMM                    0x02
#define USB_CLASS_HID                     0x03
#define USB_CLASS_PHYSICAL                0x05
#define USB_CLASS_STILL_IMAGE             0x06
#define USB_CLASS_PRINTER                 0x07
#define USB_CLASS_MASS_STORAGE            0x08
#define USB_CLASS_HUB                     0x09
#define USB_CLASS_CDC_DATA                0x0a
#define USB_CLASS_CSCID                   0x0b
#define USB_CLASS_CONTENT_SEC             0x0d
#define USB_CLASS_VIDEO                   0x0e
#define USB_CLASS_BILLBOARD               0x11
#define USB_CLASS_WIRELESS_CONTROLLER     0xe0
#define USB_CLASS_MISC                    0xef
#define USB_CLASS_APP_SPEC                0xfe
#define USB_CLASS_VENDOR_SPEC             0xff

/* USB Vendor ID assigned to Google Inc. */
#define USB_VID_GOOGLE 0x18d1

/* Google specific SubClass/Protocol assignments */
#define USB_SUBCLASS_GOOGLE_SERIAL 0x50
#define USB_PROTOCOL_GOOGLE_SERIAL 0x01

#define USB_SUBCLASS_GOOGLE_SPI    0x51
#define USB_PROTOCOL_GOOGLE_SPI    0x01

#define USB_SUBCLASS_GOOGLE_I2C    0x52
#define USB_PROTOCOL_GOOGLE_I2C    0x01

#define USB_SUBCLASS_GOOGLE_UPDATE 0x53
#define USB_PROTOCOL_GOOGLE_UPDATE 0xff

/* Double define for cr50 code freeze.
 * TODO(vbendeb): dedup this. */
#define USB_SUBCLASS_GOOGLE_CR50   0x53
/* We can use any protocol we want */
#define USB_PROTOCOL_GOOGLE_CR50_NON_HC_FW_UPDATE 0xff

#define USB_SUBCLASS_GOOGLE_POWER  0x54
#define USB_PROTOCOL_GOOGLE_POWER  0x01

/* Control requests */

/* bRequestType fields */
/* direction field */
#define USB_DIR_OUT                0    /* from host to uC */
#define USB_DIR_IN                 0x80 /* from uC to host */
/* type field */
#define USB_TYPE_MASK              (0x03 << 5)
#define USB_TYPE_STANDARD          (0x00 << 5)
#define USB_TYPE_CLASS             (0x01 << 5)
#define USB_TYPE_VENDOR            (0x02 << 5)
#define USB_TYPE_RESERVED          (0x03 << 5)
/* recipient field */
#define USB_RECIP_MASK             0x1f
#define USB_RECIP_DEVICE           0x00
#define USB_RECIP_INTERFACE        0x01
#define USB_RECIP_ENDPOINT         0x02
#define USB_RECIP_OTHER            0x03

/* Standard requests for bRequest field in a SETUP packet. */
#define USB_REQ_GET_STATUS         0x00
#define USB_REQ_GET_STATUS_SELF_POWERED  (1 << 0)
#define USB_REQ_GET_STATUS_REMOTE_WAKEUP (1 << 1)
#define USB_REQ_CLEAR_FEATURE      0x01
#define USB_REQ_SET_FEATURE        0x03
#define USB_REQ_FEATURE_ENDPOINT_HALT        0x0000
#define USB_REQ_FEATURE_DEVICE_REMOTE_WAKEUP 0x0001
#define USB_REQ_FEATURE_TEST_MODE            0x0002
#define USB_REQ_SET_ADDRESS        0x05
#define USB_REQ_GET_DESCRIPTOR     0x06
#define USB_REQ_SET_DESCRIPTOR     0x07
#define USB_REQ_GET_CONFIGURATION  0x08
#define USB_REQ_SET_CONFIGURATION  0x09
#define USB_REQ_GET_INTERFACE      0x0A
#define USB_REQ_SET_INTERFACE      0x0B
#define USB_REQ_SYNCH_FRAME        0x0C

/* WebUSB URL descriptors */
#define WEBUSB_REQ_GET_URL         0x02
#define USB_DT_WEBUSB_URL          0x03

#define USB_URL_SCHEME_HTTP       0x00
#define USB_URL_SCHEME_HTTPS      0x01
#define USB_URL_SCHEME_NONE       0xff

/*
 * URL descriptor helper.
 * (similar to string descriptor but UTF-8 instead of UTF-16)
 */
#define USB_URL_DESC(scheme, str) \
	(const void *)&(const struct { \
		uint8_t _len; \
		uint8_t _type; \
		uint8_t _scheme; \
		char _data[sizeof(str)]; \
	}) { \
		/* Total size of the descriptor is : \
		 * size of the UTF-8 text plus the len/type fields \
		 * minus the string 0-termination \
		 */ \
		sizeof(str) + 3 - 1, \
		USB_DT_WEBUSB_URL, \
		USB_URL_SCHEME_##scheme, \
		str \
	}

/* Setup Packet */
struct usb_setup_packet {
	uint8_t  bmRequestType;
	uint8_t  bRequest;
	uint16_t wValue;
	uint16_t wIndex;
	uint16_t wLength;
};

/* Helpers for descriptors */

#define WIDESTR(quote) WIDESTR2(quote)
#define WIDESTR2(quote) L##quote

#define USB_STRING_DESC(str) \
	(const void *)&(const struct { \
		uint8_t _len; \
		uint8_t _type; \
		wchar_t _data[sizeof(str)]; \
	}) { \
		/* Total size of the descriptor is : \
		 * size of the UTF-16 text plus the len/type fields \
                 * minus the string 0-termination \
                 */ \
		sizeof(WIDESTR(str)) + 2 - 2, \
		USB_DT_STRING, \
		WIDESTR(str) \
	}

#ifdef CONFIG_USB_SERIALNO
/* String Descriptor for USB, for editable strings. */
#define USB_STRING_LEN 28
struct usb_string_desc {
	uint8_t _len;
	uint8_t _type;
	wchar_t _data[USB_STRING_LEN];
};
#define USB_WR_STRING_DESC(str) \
	(&(struct usb_string_desc) { \
		/* As above, two bytes metadata, no null terminator. */ \
		sizeof(WIDESTR(str)) + 2 - 2, \
		USB_DT_STRING, \
		WIDESTR(str) \
})
extern struct usb_string_desc *usb_serialno_desc;
#endif

/* Use these macros for declaring descriptors, to order them properly */
#define USB_CONF_DESC_VAR(name, varname) varname		\
	__keep __attribute__((section(".rodata.usb_desc_" STRINGIFY(name))))
#define USB_CONF_DESC(name) USB_CONF_DESC_VAR(name, CONCAT2(usb_desc_, name))
#define USB_IFACE_DESC(num) USB_CONF_DESC(CONCAT3(iface, num, _0iface))
#define USB_CUSTOM_DESC_VAR(i, name, varname)			\
	USB_CONF_DESC_VAR(CONCAT4(iface, i, _1, name), varname)
#define USB_CUSTOM_DESC(i, name) USB_CONF_DESC(CONCAT4(iface, i, _1, name))
#define USB_EP_DESC(i, num) USB_CONF_DESC(CONCAT4(iface, i, _2ep, num))

/* USB Linker data */
extern const uint8_t __usb_desc[];
extern const uint8_t __usb_desc_end[];
#define USB_DESC_SIZE (__usb_desc_end - __usb_desc)

/* These descriptors defined in board code */
extern const void * const usb_strings[];
extern const uint8_t usb_string_desc[];
/* USB string descriptor with the firmware version */
extern const void * const usb_fw_version;
extern const struct bos_context bos_ctx;
extern const void *webusb_url;

#endif /* __CROS_EC_USB_DESCRIPTOR_H */
