linux/include/linux/usb/otg.h

/* SPDX-License-Identifier: GPL-2.0 */
/* USB OTG (On The Go) defines */
/*
 *
 * 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.
 */

#ifndef __LINUX_USB_OTG_H
#define __LINUX_USB_OTG_H

#include <linux/phy/phy.h>
#include <linux/usb/phy.h>

struct usb_otg { … };

/**
 * struct usb_otg_caps - describes the otg capabilities of the device
 * @otg_rev: The OTG revision number the device is compliant with, it's
 *		in binary-coded decimal (i.e. 2.0 is 0200H).
 * @hnp_support: Indicates if the device supports HNP.
 * @srp_support: Indicates if the device supports SRP.
 * @adp_support: Indicates if the device supports ADP.
 */
struct usb_otg_caps { … };

extern const char *usb_otg_state_string(enum usb_otg_state state);

/* Context: can sleep */
static inline int
otg_start_hnp(struct usb_otg *otg)
{ … }

/* Context: can sleep */
static inline int
otg_set_vbus(struct usb_otg *otg, bool enabled)
{ … }

/* for HCDs */
static inline int
otg_set_host(struct usb_otg *otg, struct usb_bus *host)
{ … }

/* for usb peripheral controller drivers */

/* Context: can sleep */
static inline int
otg_set_peripheral(struct usb_otg *otg, struct usb_gadget *periph)
{ … }

static inline int
otg_start_srp(struct usb_otg *otg)
{ … }

/* for OTG controller drivers (and maybe other stuff) */
extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);

enum usb_dr_mode { … };

/**
 * usb_get_dr_mode - Get dual role mode for given device
 * @dev: Pointer to the given device
 *
 * The function gets phy interface string from property 'dr_mode',
 * and returns the corresponding enum usb_dr_mode
 */
extern enum usb_dr_mode usb_get_dr_mode(struct device *dev);
extern enum usb_dr_mode usb_get_role_switch_default_mode(struct device *dev);

#endif /* __LINUX_USB_OTG_H */