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/* 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 {
u8 default_a;
struct phy *phy;
/* old usb_phy interface */
struct usb_phy *usb_phy;
struct usb_bus *host;
struct usb_gadget *gadget;
enum usb_otg_state state;
/* bind/unbind the host controller */
int (*set_host)(struct usb_otg *otg, struct usb_bus *host);
/* bind/unbind the peripheral controller */
int (*set_peripheral)(struct usb_otg *otg,
struct usb_gadget *gadget);
/* effective for A-peripheral, ignored for B devices */
int (*set_vbus)(struct usb_otg *otg, bool enabled);
/* for B devices only: start session with A-Host */
int (*start_srp)(struct usb_otg *otg);
/* start or continue HNP role switch */
int (*start_hnp)(struct usb_otg *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 {
u16 otg_rev;
bool hnp_support;
bool srp_support;
bool adp_support;
};
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)
{
if (otg && otg->start_hnp)
return otg->start_hnp(otg);
return -ENOTSUPP;
}
/* Context: can sleep */
static inline int
otg_set_vbus(struct usb_otg *otg, bool enabled)
{
if (otg && otg->set_vbus)
return otg->set_vbus(otg, enabled);
return -ENOTSUPP;
}
/* for HCDs */
static inline int
otg_set_host(struct usb_otg *otg, struct usb_bus *host)
{
if (otg && otg->set_host)
return otg->set_host(otg, host);
return -ENOTSUPP;
}
/* for usb peripheral controller drivers */
/* Context: can sleep */
static inline int
otg_set_peripheral(struct usb_otg *otg, struct usb_gadget *periph)
{
if (otg && otg->set_peripheral)
return otg->set_peripheral(otg, periph);
return -ENOTSUPP;
}
static inline int
otg_start_srp(struct usb_otg *otg)
{
if (otg && otg->start_srp)
return otg->start_srp(otg);
return -ENOTSUPP;
}
/* 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_DR_MODE_UNKNOWN,
USB_DR_MODE_HOST,
USB_DR_MODE_PERIPHERAL,
USB_DR_MODE_OTG,
};
/**
* 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 */
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