// USB functions and data.
#ifndef __USB_H
#define __USB_H

#include "util.h" // struct mutex_s

// Information on a USB end point.
struct usb_pipe {
    struct usb_s *cntl;
    u64 path;
    u8 type;
    u8 ep;
    u8 devaddr;
    u8 speed;
    u16 maxpacket;
    u8 tt_devaddr;
    u8 tt_port;
};

// Common information for usb controllers.
struct usb_s {
    struct usb_pipe *defaultpipe;
    struct mutex_s resetlock;
    int busid;
    u16 bdf;
    u8 type;
    u8 maxaddr;
};

// Information for enumerating USB hubs
struct usbhub_s {
    struct usbhub_op_s *op;
    struct usb_pipe *pipe;
    struct usb_s *cntl;
    struct mutex_s lock;
    u32 powerwait;
    u32 port;
    u32 threads;
    u32 portcount;
    u32 devcount;
};

// Hub callback (32bit) info
struct usbhub_op_s {
    int (*detect)(struct usbhub_s *hub, u32 port);
    int (*reset)(struct usbhub_s *hub, u32 port);
    void (*disconnect)(struct usbhub_s *hub, u32 port);
};

#define USB_TYPE_UHCI 1
#define USB_TYPE_OHCI 2
#define USB_TYPE_EHCI 3

#define USB_FULLSPEED 0
#define USB_LOWSPEED  1
#define USB_HIGHSPEED 2

#define USB_MAXADDR 127


/****************************************************************
 * usb structs and flags
 ****************************************************************/

// USB mandated timings (in ms)
#define USB_TIME_SIGATT 100
#define USB_TIME_ATTDB  100
#define USB_TIME_DRST   10
#define USB_TIME_DRSTR  50
#define USB_TIME_RSTRCY 10

#define USB_TIME_SETADDR_RECOVERY 2

#define USB_PID_OUT                     0xe1
#define USB_PID_IN                      0x69
#define USB_PID_SETUP                   0x2d

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

#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)

#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

#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 {
    u8 bRequestType;
    u8 bRequest;
    u16 wValue;
    u16 wIndex;
    u16 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

struct usb_device_descriptor {
    u8  bLength;
    u8  bDescriptorType;

    u16 bcdUSB;
    u8  bDeviceClass;
    u8  bDeviceSubClass;
    u8  bDeviceProtocol;
    u8  bMaxPacketSize0;
    u16 idVendor;
    u16 idProduct;
    u16 bcdDevice;
    u8  iManufacturer;
    u8  iProduct;
    u8  iSerialNumber;
    u8  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 {
    u8  bLength;
    u8  bDescriptorType;

    u16 wTotalLength;
    u8  bNumInterfaces;
    u8  bConfigurationValue;
    u8  iConfiguration;
    u8  bmAttributes;
    u8  bMaxPower;
} PACKED;

struct usb_interface_descriptor {
    u8  bLength;
    u8  bDescriptorType;

    u8  bInterfaceNumber;
    u8  bAlternateSetting;
    u8  bNumEndpoints;
    u8  bInterfaceClass;
    u8  bInterfaceSubClass;
    u8  bInterfaceProtocol;
    u8  iInterface;
} PACKED;

struct usb_endpoint_descriptor {
    u8  bLength;
    u8  bDescriptorType;

    u8  bEndpointAddress;
    u8  bmAttributes;
    u16 wMaxPacketSize;
    u8  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


/****************************************************************
 * function defs
 ****************************************************************/

// usb.c
void usb_setup(void);
void usb_enumerate(struct usbhub_s *hub);
int send_default_control(struct usb_pipe *pipe, const struct usb_ctrlrequest *req
                         , void *data);
int usb_send_bulk(struct usb_pipe *pipe, int dir, void *data, int datasize);
void free_pipe(struct usb_pipe *pipe);
struct usb_pipe *alloc_bulk_pipe(struct usb_pipe *pipe
                                 , struct usb_endpoint_descriptor *epdesc);
struct usb_pipe *alloc_intr_pipe(struct usb_pipe *pipe
                                 , struct usb_endpoint_descriptor *epdesc);
int usb_poll_intr(struct usb_pipe *pipe, void *data);
struct usb_endpoint_descriptor *findEndPointDesc(
    struct usb_interface_descriptor *iface, int imax, int type, int dir);
u32 mkendpFromDesc(struct usb_pipe *pipe
                   , struct usb_endpoint_descriptor *epdesc);

#endif // usb.h
