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6fe3172ac0
BUG=chrome-os-partner:24912 BRANCH=baytrail TEST=Manual. Enable CONFIG_POWER_BUTTON_IGNORE_LID on a device, boot it, and go into dock mode with external monitor attached. Fake-close the lid with a magnet or servo. Verify the power button still sends press/release events to the host with evtest. Change-Id: Idb05375eee0743a8a2c459070854c03fe3afe894 Signed-off-by: Dave Parker <dparker@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/184493 Reviewed-by: Randall Spangler <rspangler@chromium.org>
142 lines
3.5 KiB
C
142 lines
3.5 KiB
C
/* Copyright (c) 2013 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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/* Power button module for Chrome EC */
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#include "common.h"
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#include "console.h"
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#include "gpio.h"
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#include "hooks.h"
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#include "host_command.h"
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#include "keyboard_scan.h"
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#include "lid_switch.h"
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#include "power_button.h"
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#include "timer.h"
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#include "util.h"
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/* Console output macros */
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#define CPUTS(outstr) cputs(CC_SWITCH, outstr)
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#define CPRINTF(format, args...) cprintf(CC_SWITCH, format, ## args)
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#define PWRBTN_DEBOUNCE_US (30 * MSEC) /* Debounce time for power button */
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static int debounced_power_pressed; /* Debounced power button state */
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static int simulate_power_pressed;
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/**
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* Get raw power button signal state.
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*
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* @return 1 if power button is pressed, 0 if not pressed.
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*/
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static int raw_power_button_pressed(void)
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{
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if (simulate_power_pressed)
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return 1;
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#ifndef CONFIG_POWER_BUTTON_IGNORE_LID
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/*
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* Always indicate power button released if the lid is closed.
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* This prevents waking the system if the device is squashed enough to
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* press the power button through the closed lid.
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*/
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if (!lid_is_open())
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return 0;
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#endif
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return gpio_get_level(GPIO_POWER_BUTTON_L) ? 0 : 1;
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}
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int power_button_is_pressed(void)
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{
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return debounced_power_pressed;
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}
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/**
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* Handle power button initialization.
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*/
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static void power_button_init(void)
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{
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if (raw_power_button_pressed())
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debounced_power_pressed = 1;
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/* Enable interrupts, now that we've initialized */
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gpio_enable_interrupt(GPIO_POWER_BUTTON_L);
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}
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DECLARE_HOOK(HOOK_INIT, power_button_init, HOOK_PRIO_INIT_POWER_BUTTON);
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/**
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* Handle debounced power button changing state.
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*/
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static void power_button_change_deferred(void)
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{
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const int new_pressed = raw_power_button_pressed();
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/* Re-enable keyboard scanning if power button is no longer pressed */
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if (!new_pressed)
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keyboard_scan_enable(1);
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/* If power button hasn't changed state, nothing to do */
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if (new_pressed == debounced_power_pressed)
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return;
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debounced_power_pressed = new_pressed;
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CPRINTF("[%T power button %s]\n", new_pressed ? "pressed" : "released");
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/* Call hooks */
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hook_notify(HOOK_POWER_BUTTON_CHANGE);
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/* Notify host if power button has been pressed */
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if (new_pressed)
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host_set_single_event(EC_HOST_EVENT_POWER_BUTTON);
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}
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DECLARE_DEFERRED(power_button_change_deferred);
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void power_button_interrupt(enum gpio_signal signal)
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{
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/*
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* If power button is pressed, disable the matrix scan as soon as
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* possible to reduce the risk of false-reboot triggered by those keys
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* on the same column with refresh key.
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*/
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if (raw_power_button_pressed())
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keyboard_scan_enable(0);
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/* Reset power button debounce time */
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hook_call_deferred(power_button_change_deferred, PWRBTN_DEBOUNCE_US);
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}
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/*****************************************************************************/
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/* Console commands */
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static int command_powerbtn(int argc, char **argv)
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{
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int ms = 200; /* Press duration in ms */
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char *e;
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if (argc > 1) {
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ms = strtoi(argv[1], &e, 0);
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if (*e)
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return EC_ERROR_PARAM1;
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}
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ccprintf("Simulating %d ms power button press.\n", ms);
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simulate_power_pressed = 1;
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hook_call_deferred(power_button_change_deferred, 0);
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msleep(ms);
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ccprintf("Simulating power button release.\n");
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simulate_power_pressed = 0;
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hook_call_deferred(power_button_change_deferred, 0);
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return EC_SUCCESS;
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}
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DECLARE_CONSOLE_COMMAND(powerbtn, command_powerbtn,
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"[msec]",
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"Simulate power button press",
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NULL);
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