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 /**
  45  * struct usb_otg_caps - describes the otg capabilities of the device
  46  * @otg_rev: The OTG revision number the device is compliant with, it's
  47  *              in binary-coded decimal (i.e. 2.0 is 0200H).
  48  * @hnp_support: Indicates if the device supports HNP.
  49  * @srp_support: Indicates if the device supports SRP.
  50  * @adp_support: Indicates if the device supports ADP.
  51  */
  52 struct usb_otg_caps {
  53         u16 otg_rev;
  54         bool hnp_support;
  55         bool srp_support;
  56         bool adp_support;
  57 };
  58
  59 extern const char *usb_otg_state_string(enum usb_otg_state state);
  60
  61 /* Context: can sleep */
  62 static inline int
  63 otg_start_hnp(struct usb_otg *otg)
  64 {
  65         if (otg && otg->start_hnp)
  66                 return otg->start_hnp(otg);
  67
  68         return -ENOTSUPP;
  69 }
  70
  71 /* Context: can sleep */
  72 static inline int
  73 otg_set_vbus(struct usb_otg *otg, bool enabled)
  74 {
  75         if (otg && otg->set_vbus)
  76                 return otg->set_vbus(otg, enabled);
  77
  78         return -ENOTSUPP;
  79 }
  80
  81 /* for HCDs */
  82 static inline int
  83 otg_set_host(struct usb_otg *otg, struct usb_bus *host)
  84 {
  85         if (otg && otg->set_host)
  86                 return otg->set_host(otg, host);
  87
  88         return -ENOTSUPP;
  89 }
  90
  91 /* for usb peripheral controller drivers */
  92
  93 /* Context: can sleep */
  94 static inline int
  95 otg_set_peripheral(struct usb_otg *otg, struct usb_gadget *periph)
  96 {
  97         if (otg && otg->set_peripheral)
  98                 return otg->set_peripheral(otg, periph);
  99
 100         return -ENOTSUPP;
 101 }
 102
 103 static inline int
 104 otg_start_srp(struct usb_otg *otg)
 105 {
 106         if (otg && otg->start_srp)
 107                 return otg->start_srp(otg);
 108
 109         return -ENOTSUPP;
 110 }
 111
 112 /* for OTG controller drivers (and maybe other stuff) */
 113 extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
 114
 115 enum usb_dr_mode {
 116         USB_DR_MODE_UNKNOWN,
 117         USB_DR_MODE_HOST,
 118         USB_DR_MODE_PERIPHERAL,
 119         USB_DR_MODE_OTG,
 120 };
 121
 122 /**
 123  * usb_get_dr_mode - Get dual role mode for given device
 124  * @dev: Pointer to the given device
 125  *
 126  * The function gets phy interface string from property 'dr_mode',
 127  * and returns the correspondig enum usb_dr_mode
 128  */
 129 extern enum usb_dr_mode usb_get_dr_mode(struct device *dev);
 130
 131 #endif /* __LINUX_USB_OTG_H */