diff options
Diffstat (limited to 'common/power_button.c')
-rw-r--r-- | common/power_button.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/common/power_button.c b/common/power_button.c new file mode 100644 index 0000000000..c26fb8d5d4 --- /dev/null +++ b/common/power_button.c @@ -0,0 +1,135 @@ +/* Copyright (c) 2013 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. + */ + +/* Power button module for Chrome EC */ + +#include "common.h" +#include "console.h" +#include "gpio.h" +#include "hooks.h" +#include "host_command.h" +#include "keyboard_scan.h" +#include "lid_switch.h" +#include "power_button.h" +#include "timer.h" +#include "util.h" + +/* Console output macros */ +#define CPUTS(outstr) cputs(CC_SWITCH, outstr) +#define CPRINTF(format, args...) cprintf(CC_SWITCH, format, ## args) + +#define PWRBTN_DEBOUNCE_US (30 * MSEC) /* Debounce time for power button */ + +static int debounced_power_pressed; /* Debounced power button state */ +static int simulate_power_pressed; + +/** + * Get raw power button signal state. + * + * @return 1 if power button is pressed, 0 if not pressed. + */ +static int raw_power_button_pressed(void) +{ + if (simulate_power_pressed) + return 1; + + /* Ignore power button if lid is closed */ + if (!lid_is_open()) + return 0; + + return gpio_get_level(GPIO_POWER_BUTTON_L) ? 0 : 1; +} + +int power_button_is_pressed(void) +{ + return debounced_power_pressed; +} + +/** + * Handle power button initialization. + */ +static void power_button_init(void) +{ + if (raw_power_button_pressed()) + debounced_power_pressed = 1; + + /* Enable interrupts, now that we've initialized */ + gpio_enable_interrupt(GPIO_POWER_BUTTON_L); +} +DECLARE_HOOK(HOOK_INIT, power_button_init, HOOK_PRIO_INIT_POWER_BUTTON); + +/** + * Handle debounced power button changing state. + */ +static void power_button_change_deferred(void) +{ + const int new_pressed = raw_power_button_pressed(); + + /* If power button hasn't changed state, nothing to do */ + if (new_pressed == debounced_power_pressed) + return; + + debounced_power_pressed = new_pressed; + + CPRINTF("[%T power button %s]\n", new_pressed ? "pressed" : "released"); + + /* Re-enable keyboard scanning if power button is no longer pressed */ + if (!new_pressed) + keyboard_scan_enable(1); + + /* Call hooks */ + hook_notify(HOOK_POWER_BUTTON_CHANGE); + + /* Notify host if power button has been pressed */ + if (new_pressed) + host_set_single_event(EC_HOST_EVENT_POWER_BUTTON); +} +DECLARE_DEFERRED(power_button_change_deferred); + +void power_button_interrupt(enum gpio_signal signal) +{ + /* + * If power button is pressed, disable the matrix scan as soon as + * possible to reduce the risk of false-reboot triggered by those keys + * on the same column with refresh key. + */ + if (raw_power_button_pressed()) + keyboard_scan_enable(0); + + /* Reset power button debounce time */ + hook_call_deferred(power_button_change_deferred, PWRBTN_DEBOUNCE_US); +} + +/*****************************************************************************/ +/* Console commands */ + +static int command_powerbtn(int argc, char **argv) +{ + int ms = 200; /* Press duration in ms */ + char *e; + + if (argc > 1) { + ms = strtoi(argv[1], &e, 0); + if (*e) + return EC_ERROR_PARAM1; + } + + ccprintf("Simulating %d ms power button press.\n", ms); + simulate_power_pressed = 1; + hook_call_deferred(power_button_change_deferred, 0); + + msleep(ms); + + ccprintf("Simulating power button release.\n"); + simulate_power_pressed = 0; + hook_call_deferred(power_button_change_deferred, 0); + + return EC_SUCCESS; +} +DECLARE_CONSOLE_COMMAND(powerbtn, command_powerbtn, + "[msec]", + "Simulate power button press", + NULL); + |