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// include/linux/usb/otg.h
/*
* These APIs may be used between USB controllers. USB device drivers
* (for either host or peripheral roles) don't use these calls; they
* continue to use just usb_device and usb_gadget.
*/
/* OTG defines lots of enumeration states before device reset */
enum usb_otg_state {
OTG_STATE_UNDEFINED = 0,
/* single-role peripheral, and dual-role default-b */
OTG_STATE_B_IDLE,
OTG_STATE_B_SRP_INIT,
OTG_STATE_B_PERIPHERAL,
/* extra dual-role default-b states */
OTG_STATE_B_WAIT_ACON,
OTG_STATE_B_HOST,
/* dual-role default-a */
OTG_STATE_A_IDLE,
OTG_STATE_A_WAIT_VRISE,
OTG_STATE_A_WAIT_BCON,
OTG_STATE_A_HOST,
OTG_STATE_A_SUSPEND,
OTG_STATE_A_PERIPHERAL,
OTG_STATE_A_WAIT_VFALL,
OTG_STATE_A_VBUS_ERR,
};
/*
* the otg driver needs to interact with both device side and host side
* usb controllers. it decides which controller is active at a given
* moment, using the transceiver, ID signal, HNP and sometimes static
* configuration information (including "board isn't wired for otg").
*/
struct otg_transceiver {
struct device *dev;
const char *label;
u8 default_a;
enum usb_otg_state state;
struct usb_bus *host;
struct usb_gadget *gadget;
/* to pass extra port status to the root hub */
u16 port_status;
u16 port_change;
/* bind/unbind the host controller */
int (*set_host)(struct otg_transceiver *otg,
struct usb_bus *host);
/* bind/unbind the peripheral controller */
int (*set_peripheral)(struct otg_transceiver *otg,
struct usb_gadget *gadget);
/* effective for B devices, ignored for A-peripheral */
int (*set_power)(struct otg_transceiver *otg,
unsigned mA);
/* for non-OTG B devices: set transceiver into suspend mode */
int (*set_suspend)(struct otg_transceiver *otg,
int suspend);
/* for B devices only: start session with A-Host */
int (*start_srp)(struct otg_transceiver *otg);
/* start or continue HNP role switch */
int (*start_hnp)(struct otg_transceiver *otg);
};
/* for board-specific init logic */
extern int otg_set_transceiver(struct otg_transceiver *);
/* for usb host and peripheral controller drivers */
extern struct otg_transceiver *otg_get_transceiver(void);
static inline int
otg_start_hnp(struct otg_transceiver *otg)
{
return otg->start_hnp(otg);
}
/* for HCDs */
static inline int
otg_set_host(struct otg_transceiver *otg, struct usb_bus *host)
{
return otg->set_host(otg, host);
}
/* for usb peripheral controller drivers */
static inline int
otg_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *periph)
{
return otg->set_peripheral(otg, periph);
}
static inline int
otg_set_power(struct otg_transceiver *otg, unsigned mA)
{
return otg->set_power(otg, mA);
}
static inline int
otg_set_suspend(struct otg_transceiver *otg, int suspend)
{
if (otg->set_suspend != NULL)
return otg->set_suspend(otg, suspend);
else
return 0;
}
static inline int
otg_start_srp(struct otg_transceiver *otg)
{
return otg->start_srp(otg);
}
/* for OTG controller drivers (and maybe other stuff) */
extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
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