drivers/usb/core/hub.h

   1 #ifndef __LINUX_HUB_H
   2 #define __LINUX_HUB_H
   3
   4 /*
   5  * Hub protocol and driver data structures.
   6  *
   7  * Some of these are known to the "virtual root hub" code
   8  * in host controller drivers.
   9  */
  10
  11 #include <linux/list.h>
  12 #include <linux/workqueue.h>
  13 #include <linux/compiler.h>     /* likely()/unlikely() */
  14
  15 /*
  16  * Hub request types
  17  */
  18
  19 #define USB_RT_HUB      (USB_TYPE_CLASS | USB_RECIP_DEVICE)
  20 #define USB_RT_PORT     (USB_TYPE_CLASS | USB_RECIP_OTHER)
  21
  22 /*
  23  * Hub class requests
  24  * See USB 2.0 spec Table 11-16
  25  */
  26 #define HUB_CLEAR_TT_BUFFER     8
  27 #define HUB_RESET_TT            9
  28 #define HUB_GET_TT_STATE        10
  29 #define HUB_STOP_TT             11
  30
  31 /*
  32  * Hub Class feature numbers
  33  * See USB 2.0 spec Table 11-17
  34  */
  35 #define C_HUB_LOCAL_POWER       0
  36 #define C_HUB_OVER_CURRENT      1
  37
  38 /*
  39  * Port feature numbers
  40  * See USB 2.0 spec Table 11-17
  41  */
  42 #define USB_PORT_FEAT_CONNECTION        0
  43 #define USB_PORT_FEAT_ENABLE            1
  44 #define USB_PORT_FEAT_SUSPEND           2
  45 #define USB_PORT_FEAT_OVER_CURRENT      3
  46 #define USB_PORT_FEAT_RESET             4
  47 #define USB_PORT_FEAT_POWER             8
  48 #define USB_PORT_FEAT_LOWSPEED          9
  49 #define USB_PORT_FEAT_HIGHSPEED         10
  50 #define USB_PORT_FEAT_C_CONNECTION      16
  51 #define USB_PORT_FEAT_C_ENABLE          17
  52 #define USB_PORT_FEAT_C_SUSPEND         18
  53 #define USB_PORT_FEAT_C_OVER_CURRENT    19
  54 #define USB_PORT_FEAT_C_RESET           20
  55 #define USB_PORT_FEAT_TEST              21
  56 #define USB_PORT_FEAT_INDICATOR         22
  57
  58 /*
  59  * Hub Status and Hub Change results
  60  * See USB 2.0 spec Table 11-19 and Table 11-20
  61  */
  62 struct usb_port_status {
  63         __le16 wPortStatus;
  64         __le16 wPortChange;
  65 } __attribute__ ((packed));
  66
  67 /*
  68  * wPortStatus bit field
  69  * See USB 2.0 spec Table 11-21
  70  */
  71 #define USB_PORT_STAT_CONNECTION        0x0001
  72 #define USB_PORT_STAT_ENABLE            0x0002
  73 #define USB_PORT_STAT_SUSPEND           0x0004
  74 #define USB_PORT_STAT_OVERCURRENT       0x0008
  75 #define USB_PORT_STAT_RESET             0x0010
  76 /* bits 5 to 7 are reserved */
  77 #define USB_PORT_STAT_POWER             0x0100
  78 #define USB_PORT_STAT_LOW_SPEED         0x0200
  79 #define USB_PORT_STAT_HIGH_SPEED        0x0400
  80 #define USB_PORT_STAT_TEST              0x0800
  81 #define USB_PORT_STAT_INDICATOR         0x1000
  82 /* bits 13 to 15 are reserved */
  83
  84 /*
  85  * wPortChange bit field
  86  * See USB 2.0 spec Table 11-22
  87  * Bits 0 to 4 shown, bits 5 to 15 are reserved
  88  */
  89 #define USB_PORT_STAT_C_CONNECTION      0x0001
  90 #define USB_PORT_STAT_C_ENABLE          0x0002
  91 #define USB_PORT_STAT_C_SUSPEND         0x0004
  92 #define USB_PORT_STAT_C_OVERCURRENT     0x0008
  93 #define USB_PORT_STAT_C_RESET           0x0010
  94
  95 /*
  96  * wHubCharacteristics (masks)
  97  * See USB 2.0 spec Table 11-13, offset 3
  98  */
  99 #define HUB_CHAR_LPSM           0x0003 /* D1 .. D0 */
 100 #define HUB_CHAR_COMPOUND       0x0004 /* D2       */
 101 #define HUB_CHAR_OCPM           0x0018 /* D4 .. D3 */
 102 #define HUB_CHAR_TTTT           0x0060 /* D6 .. D5 */
 103 #define HUB_CHAR_PORTIND        0x0080 /* D7       */
 104
 105 struct usb_hub_status {
 106         __le16 wHubStatus;
 107         __le16 wHubChange;
 108 } __attribute__ ((packed));
 109
 110 /*
 111  * Hub Status & Hub Change bit masks
 112  * See USB 2.0 spec Table 11-19 and Table 11-20
 113  * Bits 0 and 1 for wHubStatus and wHubChange
 114  * Bits 2 to 15 are reserved for both
 115  */
 116 #define HUB_STATUS_LOCAL_POWER  0x0001
 117 #define HUB_STATUS_OVERCURRENT  0x0002
 118 #define HUB_CHANGE_LOCAL_POWER  0x0001
 119 #define HUB_CHANGE_OVERCURRENT  0x0002
 120
 121
 122 /*
 123  * Hub descriptor
 124  * See USB 2.0 spec Table 11-13
 125  */
 126
 127 #define USB_DT_HUB                      (USB_TYPE_CLASS | 0x09)
 128 #define USB_DT_HUB_NONVAR_SIZE          7
 129
 130 struct usb_hub_descriptor {
 131         __u8  bDescLength;
 132         __u8  bDescriptorType;
 133         __u8  bNbrPorts;
 134         __le16 wHubCharacteristics;
 135         __u8  bPwrOn2PwrGood;
 136         __u8  bHubContrCurrent;
 137                 /* add 1 bit for hub status change; round to bytes */
 138         __u8  DeviceRemovable[(USB_MAXCHILDREN + 1 + 7) / 8];
 139         __u8  PortPwrCtrlMask[(USB_MAXCHILDREN + 1 + 7) / 8];
 140 } __attribute__ ((packed));
 141
 142
 143 /* port indicator status selectors, tables 11-7 and 11-25 */
 144 #define HUB_LED_AUTO    0
 145 #define HUB_LED_AMBER   1
 146 #define HUB_LED_GREEN   2
 147 #define HUB_LED_OFF     3
 148
 149 enum hub_led_mode {
 150         INDICATOR_AUTO = 0,
 151         INDICATOR_CYCLE,
 152         /* software blinks for attention:  software, hardware, reserved */
 153         INDICATOR_GREEN_BLINK, INDICATOR_GREEN_BLINK_OFF,
 154         INDICATOR_AMBER_BLINK, INDICATOR_AMBER_BLINK_OFF,
 155         INDICATOR_ALT_BLINK, INDICATOR_ALT_BLINK_OFF
 156 } __attribute__ ((packed));
 157
 158 struct usb_device;
 159
 160 /* Transaction Translator Think Times, in bits */
 161 #define HUB_TTTT_8_BITS         0x00
 162 #define HUB_TTTT_16_BITS        0x20
 163 #define HUB_TTTT_24_BITS        0x40
 164 #define HUB_TTTT_32_BITS        0x60
 165
 166 /*
 167  * As of USB 2.0, full/low speed devices are segregated into trees.
 168  * One type grows from USB 1.1 host controllers (OHCI, UHCI etc).
 169  * The other type grows from high speed hubs when they connect to
 170  * full/low speed devices using "Transaction Translators" (TTs).
 171  *
 172  * TTs should only be known to the hub driver, and high speed bus
 173  * drivers (only EHCI for now).  They affect periodic scheduling and
 174  * sometimes control/bulk error recovery.
 175  */
 176 struct usb_tt {
 177         struct usb_device       *hub;   /* upstream highspeed hub */
 178         int                     multi;  /* true means one TT per port */
 179         unsigned                think_time;     /* think time in ns */
 180
 181         /* for control/bulk error recovery (CLEAR_TT_BUFFER) */
 182         spinlock_t              lock;
 183         struct list_head        clear_list;     /* of usb_tt_clear */
 184         struct work_struct                      kevent;
 185 };
 186
 187 struct usb_tt_clear {
 188         struct list_head        clear_list;
 189         unsigned                tt;
 190         u16                     devinfo;
 191 };
 192
 193 extern void usb_hub_tt_clear_buffer(struct usb_device *dev, int pipe);
 194
 195 #endif /* __LINUX_HUB_H */