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/* Copyright 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* USB API definitions.
*
* This file includes definitions needed by common code that wants to control
* the state of the USB peripheral, but doesn't need to know about the specific
* implementation.
*/
#ifndef __CROS_EC_USB_API_H
#define __CROS_EC_USB_API_H
/*
* Initialize the USB peripheral, enabling its clock and configuring the DP/DN
* GPIOs correctly. This function is called via an init hook (unless the board
* defined CONFIG_USB_INHIBIT_INIT), but may need to be called again if
* usb_release is called. This function will call usb_connect by default
* unless CONFIG_USB_INHIBIT_CONNECT is defined.
*/
void usb_init(void);
/* Check if USB peripheral is enabled. */
int usb_is_enabled(void);
/*
* Enable the pullup on the DP line to signal that this device exists to the
* host and to start the enumeration process.
*/
void usb_connect(void);
/*
* Disable the pullup on the DP line. This causes the device to be disconnected
* from the host.
*/
void usb_disconnect(void);
/*
* Disconnect from the host by calling usb_disconnect and then turn off the USB
* peripheral, releasing its GPIOs and disabling its clock.
*/
void usb_release(void);
/*
* Returns true if USB device is currently suspended.
* Requires CONFIG_USB_SUSPEND to be defined.
*/
int usb_is_suspended(void);
/*
* Returns true if USB remote wakeup is currently enabled by host.
* Requires CONFIG_USB_SUSPEND to be defined, always return 0 if
* CONFIG_USB_REMOTE_WAKEUP is not defined.
*/
int usb_is_remote_wakeup_enabled(void);
/*
* Preserve in non-volatile memory the state of the USB hardware registers
* which cannot be simply re-initialized when powered up again.
*/
void usb_save_suspended_state(void);
/*
* Restore from non-volatile memory the state of the USB hardware registers
* which was lost by powering them down.
*/
void usb_restore_suspended_state(void);
/*
* Tell the host to wake up. Does nothing if CONFIG_USB_REMOTE_WAKEUP is not
* defined.
*
* Returns immediately, suspend status can be checked using usb_is_suspended.
*/
#ifdef CONFIG_USB_REMOTE_WAKEUP
void usb_wake(void);
#else
static inline void usb_wake(void) {}
#endif
/* Board-specific USB wake, for side-band wake, called by usb_wake above. */
void board_usb_wake(void);
#endif /* __CROS_EC_USB_API_H */
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