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