include/linux/usb_otg.h

   1 // include/linux/usb_otg.h
   2
   3 /*
   4  * These APIs may be used between USB controllers.  USB device drivers
   5  * (for either host or peripheral roles) don't use these calls; they
   6  * continue to use just usb_device and usb_gadget.
   7  */
   8
   9
  10 /* OTG defines lots of enumeration states before device reset */
  11 enum usb_otg_state {
  12         OTG_STATE_UNDEFINED = 0,
  13
  14         /* single-role peripheral, and dual-role default-b */
  15         OTG_STATE_B_IDLE,
  16         OTG_STATE_B_SRP_INIT,
  17         OTG_STATE_B_PERIPHERAL,
  18
  19         /* extra dual-role default-b states */
  20         OTG_STATE_B_WAIT_ACON,
  21         OTG_STATE_B_HOST,
  22
  23         /* dual-role default-a */
  24         OTG_STATE_A_IDLE,
  25         OTG_STATE_A_WAIT_VRISE,
  26         OTG_STATE_A_WAIT_BCON,
  27         OTG_STATE_A_HOST,
  28         OTG_STATE_A_SUSPEND,
  29         OTG_STATE_A_PERIPHERAL,
  30         OTG_STATE_A_WAIT_VFALL,
  31         OTG_STATE_A_VBUS_ERR,
  32 };
  33
  34 /*
  35  * the otg driver needs to interact with both device side and host side
  36  * usb controllers.  it decides which controller is active at a given
  37  * moment, using the transceiver, ID signal, HNP and sometimes static
  38  * configuration information (including "board isn't wired for otg").
  39  */
  40 struct otg_transceiver {
  41         struct device           *dev;
  42         const char              *label;
  43
  44         u8                      default_a;
  45         enum usb_otg_state      state;
  46
  47         struct usb_bus          *host;
  48         struct usb_gadget       *gadget;
  49
  50         /* to pass extra port status to the root hub */
  51         u16                     port_status;
  52         u16                     port_change;
  53
  54         /* bind/unbind the host controller */
  55         int     (*set_host)(struct otg_transceiver *otg,
  56                                 struct usb_bus *host);
  57
  58         /* bind/unbind the peripheral controller */
  59         int     (*set_peripheral)(struct otg_transceiver *otg,
  60                                 struct usb_gadget *gadget);
  61
  62         /* effective for B devices, ignored for A-peripheral */
  63         int     (*set_power)(struct otg_transceiver *otg,
  64                                 unsigned mA);
  65
  66         /* for B devices only:  start session with A-Host */
  67         int     (*start_srp)(struct otg_transceiver *otg);
  68
  69         /* start or continue HNP role switch */
  70         int     (*start_hnp)(struct otg_transceiver *otg);
  71
  72 };
  73
  74
  75 /* for board-specific init logic */
  76 extern int otg_set_transceiver(struct otg_transceiver *);
  77
  78
  79 /* for usb host and peripheral controller drivers */
  80 extern struct otg_transceiver *otg_get_transceiver(void);
  81
  82 static inline int
  83 otg_start_hnp(struct otg_transceiver *otg)
  84 {
  85         return otg->start_hnp(otg);
  86 }
  87
  88
  89 /* for HCDs */
  90 static inline int
  91 otg_set_host(struct otg_transceiver *otg, struct usb_bus *host)
  92 {
  93         return otg->set_host(otg, host);
  94 }
  95
  96
  97 /* for usb peripheral controller drivers */
  98 static inline int
  99 otg_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *periph)
 100 {
 101         return otg->set_peripheral(otg, periph);
 102 }
 103
 104 static inline int
 105 otg_set_power(struct otg_transceiver *otg, unsigned mA)
 106 {
 107         return otg->set_power(otg, mA);
 108 }
 109
 110 static inline int
 111 otg_start_srp(struct otg_transceiver *otg)
 112 {
 113         return otg->start_srp(otg);
 114 }
 115
 116
 117 /* for OTG controller drivers (and maybe other stuff) */
 118 extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);