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hub.h

#ifndef __LINUX_HUB_H
#define __LINUX_HUB_H

/*
 * Hub protocol and driver data structures.
 *
 * Some of these are known to the "virtual root hub" code
 * in host controller drivers.
 */

#include <linux/list.h>
#include <linux/workqueue.h>
#include <linux/compiler.h>   /* likely()/unlikely() */

/*
 * Hub request types
 */

#define USB_RT_HUB      (USB_TYPE_CLASS | USB_RECIP_DEVICE)
#define USB_RT_PORT     (USB_TYPE_CLASS | USB_RECIP_OTHER)

/*
 * Hub class requests
 * See USB 2.0 spec Table 11-16
 */
#define HUB_CLEAR_TT_BUFFER   8
#define HUB_RESET_TT          9
#define HUB_GET_TT_STATE      10
#define HUB_STOP_TT           11

/*
 * Hub Class feature numbers
 * See USB 2.0 spec Table 11-17
 */
#define C_HUB_LOCAL_POWER     0
#define C_HUB_OVER_CURRENT    1

/*
 * Port feature numbers
 * See USB 2.0 spec Table 11-17
 */
#define USB_PORT_FEAT_CONNECTION    0
#define USB_PORT_FEAT_ENABLE        1
#define USB_PORT_FEAT_SUSPEND       2
#define USB_PORT_FEAT_OVER_CURRENT  3
#define USB_PORT_FEAT_RESET         4
#define USB_PORT_FEAT_POWER         8
#define USB_PORT_FEAT_LOWSPEED            9
#define USB_PORT_FEAT_HIGHSPEED           10
#define USB_PORT_FEAT_C_CONNECTION  16
#define USB_PORT_FEAT_C_ENABLE            17
#define USB_PORT_FEAT_C_SUSPEND           18
#define USB_PORT_FEAT_C_OVER_CURRENT      19
#define USB_PORT_FEAT_C_RESET       20
#define USB_PORT_FEAT_TEST              21
#define USB_PORT_FEAT_INDICATOR         22

/* 
 * Hub Status and Hub Change results
 * See USB 2.0 spec Table 11-19 and Table 11-20
 */
struct usb_port_status {
      __le16 wPortStatus;
      __le16 wPortChange;     
} __attribute__ ((packed));

/* 
 * wPortStatus bit field
 * See USB 2.0 spec Table 11-21
 */
#define USB_PORT_STAT_CONNECTION    0x0001
#define USB_PORT_STAT_ENABLE        0x0002
#define USB_PORT_STAT_SUSPEND       0x0004
#define USB_PORT_STAT_OVERCURRENT   0x0008
#define USB_PORT_STAT_RESET         0x0010
/* bits 5 to 7 are reserved */
#define USB_PORT_STAT_POWER         0x0100
#define USB_PORT_STAT_LOW_SPEED           0x0200
#define USB_PORT_STAT_HIGH_SPEED        0x0400
#define USB_PORT_STAT_TEST              0x0800
#define USB_PORT_STAT_INDICATOR         0x1000
/* bits 13 to 15 are reserved */

/* 
 * wPortChange bit field
 * See USB 2.0 spec Table 11-22
 * Bits 0 to 4 shown, bits 5 to 15 are reserved
 */
#define USB_PORT_STAT_C_CONNECTION  0x0001
#define USB_PORT_STAT_C_ENABLE            0x0002
#define USB_PORT_STAT_C_SUSPEND           0x0004
#define USB_PORT_STAT_C_OVERCURRENT 0x0008
#define USB_PORT_STAT_C_RESET       0x0010

/*
 * wHubCharacteristics (masks) 
 * See USB 2.0 spec Table 11-13, offset 3
 */
#define HUB_CHAR_LPSM         0x0003 /* D1 .. D0 */
#define HUB_CHAR_COMPOUND     0x0004 /* D2       */
#define HUB_CHAR_OCPM         0x0018 /* D4 .. D3 */
#define HUB_CHAR_TTTT           0x0060 /* D6 .. D5 */
#define HUB_CHAR_PORTIND        0x0080 /* D7       */

struct usb_hub_status {
      __le16 wHubStatus;
      __le16 wHubChange;
} __attribute__ ((packed));

/*
 * Hub Status & Hub Change bit masks
 * See USB 2.0 spec Table 11-19 and Table 11-20
 * Bits 0 and 1 for wHubStatus and wHubChange
 * Bits 2 to 15 are reserved for both
 */
#define HUB_STATUS_LOCAL_POWER      0x0001
#define HUB_STATUS_OVERCURRENT      0x0002
#define HUB_CHANGE_LOCAL_POWER      0x0001
#define HUB_CHANGE_OVERCURRENT      0x0002


/* 
 * Hub descriptor 
 * See USB 2.0 spec Table 11-13
 */

#define USB_DT_HUB                  (USB_TYPE_CLASS | 0x09)
#define USB_DT_HUB_NONVAR_SIZE            7

struct usb_hub_descriptor {
      __u8  bDescLength;
      __u8  bDescriptorType;
      __u8  bNbrPorts;
      __le16 wHubCharacteristics;
      __u8  bPwrOn2PwrGood;
      __u8  bHubContrCurrent;
            /* add 1 bit for hub status change; round to bytes */
      __u8  DeviceRemovable[(USB_MAXCHILDREN + 1 + 7) / 8];
      __u8  PortPwrCtrlMask[(USB_MAXCHILDREN + 1 + 7) / 8];
} __attribute__ ((packed));


/* port indicator status selectors, tables 11-7 and 11-25 */
#define HUB_LED_AUTO    0
#define HUB_LED_AMBER   1
#define HUB_LED_GREEN   2
#define HUB_LED_OFF     3

enum hub_led_mode {
      INDICATOR_AUTO = 0,
      INDICATOR_CYCLE,
      /* software blinks for attention:  software, hardware, reserved */
      INDICATOR_GREEN_BLINK, INDICATOR_GREEN_BLINK_OFF,
      INDICATOR_AMBER_BLINK, INDICATOR_AMBER_BLINK_OFF,
      INDICATOR_ALT_BLINK, INDICATOR_ALT_BLINK_OFF
} __attribute__ ((packed));

struct usb_device;

/* Transaction Translator Think Times, in bits */
#define HUB_TTTT_8_BITS       0x00
#define HUB_TTTT_16_BITS      0x20
#define HUB_TTTT_24_BITS      0x40
#define HUB_TTTT_32_BITS      0x60

/*
 * As of USB 2.0, full/low speed devices are segregated into trees.
 * One type grows from USB 1.1 host controllers (OHCI, UHCI etc).
 * The other type grows from high speed hubs when they connect to
 * full/low speed devices using "Transaction Translators" (TTs).
 *
 * TTs should only be known to the hub driver, and high speed bus
 * drivers (only EHCI for now).  They affect periodic scheduling and
 * sometimes control/bulk error recovery.
 */
struct usb_tt {
      struct usb_device *hub; /* upstream highspeed hub */
      int               multi;      /* true means one TT per port */
      unsigned          think_time; /* think time in ns */

      /* for control/bulk error recovery (CLEAR_TT_BUFFER) */
      spinlock_t        lock;
      struct list_head  clear_list; /* of usb_tt_clear */
      struct work_struct                  kevent;
};

struct usb_tt_clear {
      struct list_head  clear_list;
      unsigned          tt;
      u16               devinfo;
};

extern void usb_hub_tt_clear_buffer (struct usb_device *dev, int pipe);

#endif /* __LINUX_HUB_H */

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