// Standard definitions for USB commands and data structures
#ifndef __GENERIC_USBSTD_H
#define __GENERIC_USBSTD_H

#include <stdint.h> // uint8_t
#include "compiler.h" // PACKED

#define USB_DIR_OUT                     0               /* to device */
#define USB_DIR_IN                      0x80            /* to host */

#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

struct usb_ctrlrequest {
    uint8_t bRequestType;
    uint8_t bRequest;
    uint16_t wValue;
    uint16_t wIndex;
    uint16_t wLength;
} PACKED;

#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_ENDPOINT_COMPANION       0x30

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_CLASS_PER_INTERFACE         0       /* for DeviceClass */
#define USB_CLASS_AUDIO                 1
#define USB_CLASS_COMM                  2
#define USB_CLASS_HID                   3
#define USB_CLASS_PHYSICAL              5
#define USB_CLASS_STILL_IMAGE           6
#define USB_CLASS_PRINTER               7
#define USB_CLASS_MASS_STORAGE          8
#define USB_CLASS_HUB                   9

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;

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;

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_ENDPOINT_NUMBER_MASK        0x0f    /* in bEndpointAddress */
#define USB_ENDPOINT_DIR_MASK           0x80

#define USB_ENDPOINT_XFERTYPE_MASK      0x03    /* in bmAttributes */
#define USB_ENDPOINT_XFER_CONTROL       0
#define USB_ENDPOINT_XFER_ISOC          1
#define USB_ENDPOINT_XFER_BULK          2
#define USB_ENDPOINT_XFER_INT           3
#define USB_ENDPOINT_MAX_ADJUSTABLE     0x80

struct usb_string_descriptor {
    uint8_t bLength;
    uint8_t bDescriptorType;
    //uint16_t data[];
    typeof(*u"") data[];
} PACKED;

#define USB_LANGID_ENGLISH_US 0x0409

#endif // usbstd.h