include/linux/usb/otg.h

   1 /* USB OTG (On The Go) defines */
   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 #ifndef __LINUX_USB_OTG_H
  10 #define __LINUX_USB_OTG_H
  11
  12 #include <linux/phy/phy.h>
  13 #include <linux/usb/phy.h>
  14
  15 struct usb_otg {
  16         u8                      default_a;
  17
  18         struct phy              *phy;
  19         /* old usb_phy interface */
  20         struct usb_phy          *usb_phy;
  21         struct usb_bus          *host;
  22         struct usb_gadget       *gadget;
  23
  24         enum usb_otg_state      state;
  25
  26         /* bind/unbind the host controller */
  27         int     (*set_host)(struct usb_otg *otg, struct usb_bus *host);
  28
  29         /* bind/unbind the peripheral controller */
  30         int     (*set_peripheral)(struct usb_otg *otg,
  31                                         struct usb_gadget *gadget);
  32
  33         /* effective for A-peripheral, ignored for B devices */
  34         int     (*set_vbus)(struct usb_otg *otg, bool enabled);
  35
  36         /* for B devices only:  start session with A-Host */
  37         int     (*start_srp)(struct usb_otg *otg);
  38
  39         /* start or continue HNP role switch */
  40         int     (*start_hnp)(struct usb_otg *otg);
  41
  42 };
  43
  44 extern const char *usb_otg_state_string(enum usb_otg_state state);
  45
  46 /* Context: can sleep */
  47 static inline int
  48 otg_start_hnp(struct usb_otg *otg)
  49 {
  50         if (otg && otg->start_hnp)
  51                 return otg->start_hnp(otg);
  52
  53         return -ENOTSUPP;
  54 }
  55
  56 /* Context: can sleep */
  57 static inline int
  58 otg_set_vbus(struct usb_otg *otg, bool enabled)
  59 {
  60         if (otg && otg->set_vbus)
  61                 return otg->set_vbus(otg, enabled);
  62
  63         return -ENOTSUPP;
  64 }
  65
  66 /* for HCDs */
  67 static inline int
  68 otg_set_host(struct usb_otg *otg, struct usb_bus *host)
  69 {
  70         if (otg && otg->set_host)
  71                 return otg->set_host(otg, host);
  72
  73         return -ENOTSUPP;
  74 }
  75
  76 /* for usb peripheral controller drivers */
  77
  78 /* Context: can sleep */
  79 static inline int
  80 otg_set_peripheral(struct usb_otg *otg, struct usb_gadget *periph)
  81 {
  82         if (otg && otg->set_peripheral)
  83                 return otg->set_peripheral(otg, periph);
  84
  85         return -ENOTSUPP;
  86 }
  87
  88 static inline int
  89 otg_start_srp(struct usb_otg *otg)
  90 {
  91         if (otg && otg->start_srp)
  92                 return otg->start_srp(otg);
  93
  94         return -ENOTSUPP;
  95 }
  96
  97 /* for OTG controller drivers (and maybe other stuff) */
  98 extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
  99
 100 enum usb_dr_mode {
 101         USB_DR_MODE_UNKNOWN,
 102         USB_DR_MODE_HOST,
 103         USB_DR_MODE_PERIPHERAL,
 104         USB_DR_MODE_OTG,
 105 };
 106
 107 #endif /* __LINUX_USB_OTG_H */