// Copyright 2016 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#pragma once

// clang-format off

#include <endian.h>
#include <stdint.h>
#include <zircon/compiler.h>

__BEGIN_CDECLS;

// maximum number of endpoints per device
#define USB_MAX_EPS                     32

/* Request Types */
#define USB_DIR_OUT                     (0 << 7)
#define USB_DIR_IN                      (1 << 7)
#define USB_DIR_MASK                    (1 << 7)
#define USB_TYPE_STANDARD               (0 << 5)
#define USB_TYPE_CLASS                  (1 << 5)
#define USB_TYPE_VENDOR                 (2 << 5)
#define USB_TYPE_MASK                   (3 << 5)
#define USB_RECIP_DEVICE                (0 << 0)
#define USB_RECIP_INTERFACE             (1 << 0)
#define USB_RECIP_ENDPOINT              (2 << 0)
#define USB_RECIP_OTHER                 (3 << 0)
#define USB_RECIP_MASK                  (0x1f << 0)

/* 1.0 Request Values */
#define USB_REQ_GET_STATUS                  0x00
#define USB_REQ_CLEAR_FEATURE               0x01
#define USB_REQ_SET_FEATURE                 0x03
#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

/* USB device/interface classes */
#define USB_CLASS_AUDIO                     0x01
#define USB_CLASS_COMM                      0x02
#define USB_CLASS_HID                       0x03
#define USB_CLASS_PHYSICAL                  0x05
#define USB_CLASS_IMAGING                   0x06
#define USB_CLASS_PRINTER                   0x07
#define USB_CLASS_MSC                       0x08
#define USB_CLASS_HUB                       0x09
#define USB_CLASS_CDC                       0x0a
#define USB_CLASS_CCID                      0x0b
#define USB_CLASS_SECURITY                  0x0d
#define USB_CLASS_VIDEO                     0x0e
#define USB_CLASS_HEALTHCARE                0x0f
#define USB_CLASS_DIAGNOSTIC                0xdc
#define USB_CLASS_WIRELESS                  0xe0
#define USB_CLASS_MISC                      0xef
#define USB_CLASS_VENDOR                    0xFf

#define USB_SUBCLASS_MSC_SCSI               0x06
#define USB_PROTOCOL_MSC_BULK_ONLY          0x50

/* Descriptor Types */
#define USB_DT_DEVICE                      0x01
#define USB_DT_CONFIG                      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_INTERFACE_ASSOCIATION       0x0b
#define USB_DT_HID                         0x21
#define USB_DT_HIDREPORT                   0x22
#define USB_DT_HIDPHYSICAL                 0x23
#define USB_DT_CS_INTERFACE                0x24
#define USB_DT_CS_ENDPOINT                 0x25
#define USB_DT_SS_EP_COMPANION             0x30
#define USB_DT_SS_ISOCH_EP_COMPANION       0x31

/* USB device feature selectors */
#define USB_DEVICE_SELF_POWERED            0x00
#define USB_DEVICE_REMOTE_WAKEUP           0x01
#define USB_DEVICE_TEST_MODE               0x02

/* Configuration attributes (bmAttributes) */
#define USB_CONFIGURATION_REMOTE_WAKEUP    0x20
#define USB_CONFIGURATION_SELF_POWERED     0x40
#define USB_CONFIGURATION_RESERVED_7       0x80 // This bit must be set

/* Endpoint direction (bEndpointAddress) */
#define USB_ENDPOINT_IN                    0x80
#define USB_ENDPOINT_OUT                   0x00
#define USB_ENDPOINT_DIR_MASK              0x80

/* Endpoint types (bmAttributes) */
#define USB_ENDPOINT_CONTROL               0x00
#define USB_ENDPOINT_ISOCHRONOUS           0x01
#define USB_ENDPOINT_BULK                  0x02
#define USB_ENDPOINT_INTERRUPT             0x03
#define USB_ENDPOINT_TYPE_MASK             0x03

/* Endpoint synchronization type (bmAttributes) */
#define USB_ENDPOINT_NO_SYNCHRONIZATION    0x00
#define USB_ENDPOINT_ASYNCHRONOUS          0x04
#define USB_ENDPOINT_ADAPTIVE              0x08
#define USB_ENDPOINT_SYNCHRONOUS           0x0C
#define USB_ENDPOINT_SYNCHRONIZATION_MASK  0x0C

/* Endpoint usage type (bmAttributes) */
#define USB_ENDPOINT_DATA                  0x00
#define USB_ENDPOINT_FEEDBACK              0x10
#define USB_ENDPOINT_IMPLICIT_FEEDBACK     0x20
#define USB_ENDPOINT_USAGE_MASK            0x30

#define USB_ENDPOINT_HALT                  0x00

// Values in this enum match those used in XHCI and other parts of the USB specification
typedef enum {
    USB_SPEED_UNDEFINED = 0,
    USB_SPEED_FULL = 1,
    USB_SPEED_LOW = 2,
    USB_SPEED_HIGH = 3,
    USB_SPEED_SUPER = 4,
} usb_speed_t;

/* general USB defines */
typedef struct {
    uint8_t bmRequestType;
    uint8_t bRequest;
    uint16_t wValue;
    uint16_t wIndex;
    uint16_t wLength;
} __attribute__ ((packed)) usb_setup_t;

typedef struct {
    uint8_t bLength;
    uint8_t bDescriptorType;
} __attribute__ ((packed)) usb_descriptor_header_t;

typedef struct {
    uint8_t bLength;
    uint8_t bDescriptorType;    // USB_DT_DEVICE
    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;
} __attribute__ ((packed)) usb_device_descriptor_t;

typedef struct {
    uint8_t bLength;
    uint8_t bDescriptorType;    // USB_DT_CONFIG
    uint16_t wTotalLength;
    uint8_t bNumInterfaces;
    uint8_t bConfigurationValue;
    uint8_t iConfiguration;
    uint8_t bmAttributes;
    uint8_t bMaxPower;
} __attribute__ ((packed)) usb_configuration_descriptor_t;

typedef struct {
    uint8_t bLength;
    uint8_t bDescriptorType;    // USB_DT_STRING
    uint8_t bString[];
} __attribute__ ((packed)) usb_string_descriptor_t;

typedef struct {
    uint8_t bLength;
    uint8_t bDescriptorType;    // USB_DT_INTERFACE
    uint8_t bInterfaceNumber;
    uint8_t bAlternateSetting;
    uint8_t bNumEndpoints;
    uint8_t bInterfaceClass;
    uint8_t bInterfaceSubClass;
    uint8_t bInterfaceProtocol;
    uint8_t iInterface;
} __attribute__ ((packed)) usb_interface_descriptor_t;

typedef struct {
    uint8_t bLength;
    uint8_t bDescriptorType;    // USB_DT_ENDPOINT
    uint8_t bEndpointAddress;
    uint8_t bmAttributes;
    uint16_t wMaxPacketSize;
    uint8_t bInterval;
} __attribute__ ((packed)) usb_endpoint_descriptor_t;
#define usb_ep_direction(ep)    ((ep)->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
#define usb_ep_type(ep)         ((ep)->bmAttributes & USB_ENDPOINT_TYPE_MASK)
// max packet size is in bits 10..0
#define usb_ep_max_packet(ep)   (le16toh((ep)->wMaxPacketSize) & 0x07FF)
// for high speed interrupt and isochronous endpoints, additional transactions per microframe
// are in bits 12..11
#define usb_ep_add_mf_transactions(ep) ((le16toh((ep)->wMaxPacketSize) >> 11) & 3)

typedef struct {
    uint8_t bLength;
    uint8_t bDescriptorType;    // USB_DT_SS_EP_COMPANION
    uint8_t bMaxBurst;
    uint8_t bmAttributes;
    uint16_t wBytesPerInterval;
} __attribute__ ((packed)) usb_ss_ep_comp_descriptor_t;

typedef struct {
    uint8_t bLength;
    uint8_t bDescriptorType;    // USB_DT_SS_ISOCH_EP_COMPANION
    uint16_t wReserved;
    uint16_t wBytesPerInterval;
} __attribute__ ((packed)) usb_ss_isoch_ep_comp_descriptor_t;

typedef struct {
    uint8_t bLength;
    uint8_t bDescriptorType;    // USB_DT_INTERFACE_ASSOCIATION
    uint8_t bFirstInterface;
    uint8_t bInterfaceCount;
    uint8_t bFunctionClass;
    uint8_t bFunctionSubClass;
    uint8_t bFunctionProtocol;
    uint8_t iFunction;
} __attribute__ ((packed)) usb_interface_assoc_descriptor_t;

typedef struct {
    uint8_t bLength;
    uint8_t bDescriptorType;    // USB_DT_CS_INTERFACE
    uint8_t bDescriptorSubType;
} __attribute__ ((packed)) usb_cs_interface_descriptor_t;

__END_CDECLS;