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520bd3f6ad
Current usb_wake was sleeping between setting and clearing RESUME bit, which is unprecise. Instead, we count ESOF interrupts in usb_interrupt to detect when to clear RESUME. It is also important that usb_wake does not block, as the calling task (e.g. keyboard scanning) must continue to service events while the USB device is resuming. BRANCH=none BUG=b:35587173 TEST=Connect hammer, force autosuspend using: DEVICE=$(dirname $(grep 5022 /sys/bus/usb/devices/*/idProduct)) echo 500 > $DEVICE/power/autosuspend_delay_ms echo auto > $DEVICE/power/control Wait a second, type something quickly, verify that no keys are lost. Change-Id: I53b46cce5a4adb0ee4c4a7e9f935c00f7f321636 Reviewed-on: https://chromium-review.googlesource.com/490129 Commit-Ready: Nicolas Boichat <drinkcat@chromium.org> Tested-by: Nicolas Boichat <drinkcat@chromium.org> Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* USB API definitions.
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*
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* This file includes definitions needed by common code that wants to control
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* the state of the USB peripheral, but doesn't need to know about the specific
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* implementation.
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*/
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#ifndef __CROS_EC_USB_API_H
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#define __CROS_EC_USB_API_H
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/*
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* Initialize the USB peripheral, enabling its clock and configuring the DP/DN
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* GPIOs correctly. This function is called via an init hook (unless the board
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* defined CONFIG_USB_INHIBIT_INIT), but may need to be called again if
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* usb_release is called. This function will call usb_connect by default
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* unless CONFIG_USB_INHIBIT_CONNECT is defined.
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*/
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void usb_init(void);
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/* Check if USB peripheral is enabled. */
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int usb_is_enabled(void);
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/*
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* Enable the pullup on the DP line to signal that this device exists to the
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* host and to start the enumeration process.
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*/
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void usb_connect(void);
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/*
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* Disable the pullup on the DP line. This causes the device to be disconnected
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* from the host.
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*/
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void usb_disconnect(void);
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/*
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* Disconnect from the host by calling usb_disconnect and then turn off the USB
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* peripheral, releasing its GPIOs and disabling its clock.
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*/
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void usb_release(void);
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/*
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* Returns true if USB device is currently suspended.
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* Requires CONFIG_USB_SUSPEND to be defined.
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*/
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int usb_is_suspended(void);
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/*
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* Tell the host to wake up. Requires CONFIG_USB_REMOTE_WAKEUP to be defined,
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* and a chip that implements the function.
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*
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* Returns immediately, suspend status can be checked using usb_is_suspended.
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*/
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void usb_wake(void);
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#ifdef CONFIG_USB_SELECT_PHY
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/* Select which PHY to use. */
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void usb_select_phy(uint32_t phy);
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/* Get the current PHY */
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uint32_t usb_get_phy(void);
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#endif
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#endif /* __CROS_EC_USB_API_H */
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