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94acd01e0c
In order to wake the chips from STOP/SLEEP mode with a touch, we need to put the two chips in correct state before going into STOP/SLEEP mode. Also, when one of the chips wakes up, it needs to wake the other chip with GPIO interrupt. This CL implements the necessary methods and also adds a sample routine that put the chips in STOP mode and wait for a touch using the implemented methods. BUG=None TEST=Build and boot. Touch the panel and see the response in console. BRANCH=None Change-Id: Ia5f7df8b550ee2459bcae1840f8a2717c8d947ce Signed-off-by: Vic Yang <victoryang@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/204482 Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
50 lines
1.4 KiB
C
50 lines
1.4 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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/* Master/slave identification */
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#ifndef __BOARD_KEYBORG_MASTER_SLAVE_H
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#define __BOARD_KEYBORG_MASTER_SLAVE_H
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/**
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* Get the identity of this chip.
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*
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* @return 1 if master; otherwise, 0.
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*/
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int master_slave_is_master(void);
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/**
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* Synchronize with the other chip. The other chip must also call this
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* function to synchronize.
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*
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* @param timeout_ms Timeout value in millisecond. If the other chip
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* doesn't synchronize within this time, the sync
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* call fails.
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*
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* @return EC_SUCCESS, or non-zero if any error.
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*/
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#define master_slave_sync(timeout_ms) \
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master_slave_sync_impl(__FILE__, __LINE__, timeout_ms)
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int master_slave_sync_impl(const char *filename, int line, int timeout_ms);
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/**
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* Enable/disable master-slave interrupt. Master-slave interrupt is
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* implemented using SYNC1/SYNC2 signal, so this is assuming the master
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* and the slave are in sync waiting for interrupt.
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*/
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void master_slave_enable_interrupt(void);
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void master_slave_disable_interrupt(void);
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/* Interrupt the other chip with a 1-ms pulse. */
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void master_slave_wake_other(void);
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/**
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* Identify this chip and shake hands with the other chip.
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*
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* @return EC_SUCCESS, or non-zero if any error.
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*/
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int master_slave_init(void);
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#endif /* __BOARD_KEYBORG_MASTER_SLAVE_H */
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