// 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 intotg_start_hnp(struct otg_transceiver *otg){	return otg->start_hnp(otg);}/* for HCDs */static inline intotg_set_host(struct otg_transceiver *otg, struct usb_bus *host){	return otg->set_host(otg, host);}/* for usb peripheral controller drivers */static inline intotg_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *periph){	return otg->set_peripheral(otg, periph);}static inline intotg_set_power(struct otg_transceiver *otg, unsigned mA){	return otg->set_power(otg, mA);}static inline intotg_set_suspend(struct otg_transceiver *otg, int suspend){	if (otg->set_suspend != NULL)		return otg->set_suspend(otg, suspend);	else		return 0;}static inline intotg_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);