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/* Copyright (c) 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.
*/
/* Button module for Chrome EC */
#include "button.h"
#include "common.h"
#include "console.h"
#include "gpio.h"
#include "host_command.h"
#include "hooks.h"
#include "keyboard_protocol.h"
#include "system.h"
#include "timer.h"
#include "util.h"
/* Console output macro */
#define CPRINTS(format, args...) cprints(CC_SWITCH, format, ## args)
struct button_state_t {
uint64_t debounce_time;
int debounced_pressed;
};
static struct button_state_t __bss_slow state[CONFIG_BUTTON_COUNT];
static uint64_t __bss_slow next_deferred_time;
#ifdef CONFIG_CMD_BUTTON
static int siml_btn_presd;
static int simulated_button_pressed(void)
{
static int button = 1;
button = !button;
return button;
}
#endif
/*
* Whether a button is currently pressed.
*/
static int raw_button_pressed(const struct button_config *button)
{
int raw_value =
#ifdef CONFIG_CMD_BUTTON
siml_btn_presd ?
simulated_button_pressed() :
#endif
gpio_get_level(button->gpio);
return button->flags & BUTTON_FLAG_ACTIVE_HIGH ?
raw_value : !raw_value;
}
/*
* Button initialization.
*/
void button_init(void)
{
int i;
CPRINTS("(re)initializing buttons and interrupts");
next_deferred_time = 0;
for (i = 0; i < CONFIG_BUTTON_COUNT; i++) {
state[i].debounced_pressed = raw_button_pressed(&buttons[i]);
state[i].debounce_time = 0;
gpio_enable_interrupt(buttons[i].gpio);
}
#ifdef CONFIG_BUTTON_RECOVERY
if (!system_jumped_to_this_image() &&
(system_get_reset_flags() & RESET_FLAG_RESET_PIN) &&
raw_button_pressed(&buttons[BUTTON_VOLUME_DOWN]) &&
raw_button_pressed(&buttons[BUTTON_VOLUME_UP])) {
host_set_single_event(EC_HOST_EVENT_KEYBOARD_RECOVERY);
}
#endif
}
/*
* Handle debounced button changing state.
*/
static void button_change_deferred(void);
DECLARE_DEFERRED(button_change_deferred);
static void button_change_deferred(void)
{
int i;
int new_pressed;
uint64_t soonest_debounce_time = 0;
uint64_t time_now = get_time().val;
for (i = 0; i < CONFIG_BUTTON_COUNT; i++) {
/* Skip this button if we are not waiting to debounce */
if (state[i].debounce_time == 0)
continue;
if (state[i].debounce_time <= time_now) {
/* Check if the state has changed */
new_pressed = raw_button_pressed(&buttons[i]);
if (state[i].debounced_pressed != new_pressed) {
state[i].debounced_pressed = new_pressed;
CPRINTS("Button '%s' was %s",
buttons[i].name, new_pressed ?
"pressed" : "released");
#if defined(HAS_TASK_KEYPROTO) || defined(CONFIG_KEYBOARD_PROTOCOL_MKBP)
keyboard_update_button(buttons[i].type,
new_pressed);
#endif
}
/* Clear the debounce time to stop checking it */
state[i].debounce_time = 0;
} else {
/*
* Make sure the next deferred call happens on or before
* each button needs it.
*/
soonest_debounce_time = (soonest_debounce_time == 0) ?
state[i].debounce_time :
MIN(soonest_debounce_time,
state[i].debounce_time);
}
}
if (soonest_debounce_time != 0) {
next_deferred_time = soonest_debounce_time;
hook_call_deferred(&button_change_deferred_data,
next_deferred_time - time_now);
}
}
/*
* Handle a button interrupt.
*/
void button_interrupt(enum gpio_signal signal)
{
int i;
uint64_t time_now = get_time().val;
for (i = 0; i < CONFIG_BUTTON_COUNT; i++) {
if (buttons[i].gpio != signal)
continue;
state[i].debounce_time = time_now + buttons[i].debounce_us;
if (next_deferred_time <= time_now ||
next_deferred_time > state[i].debounce_time) {
next_deferred_time = state[i].debounce_time;
hook_call_deferred(&button_change_deferred_data,
next_deferred_time - time_now);
}
break;
}
}
#ifdef CONFIG_CMD_BUTTON
static int button_present(enum keyboard_button_type type)
{
int i;
for (i = 0; i < CONFIG_BUTTON_COUNT; i++)
if (buttons[i].type == type)
break;
return i;
}
static void button_interrupt_simulate(int button)
{
button_interrupt(buttons[button].gpio);
usleep(buttons[button].debounce_us >> 2);
button_interrupt(buttons[button].gpio);
}
static int console_command_button(int argc, char **argv)
{
int button;
int press_ms = 50;
char *e;
if (argc < 2)
return EC_ERROR_PARAM_COUNT;
if (!strcasecmp(argv[1], "vup"))
button = button_present(KEYBOARD_BUTTON_VOLUME_UP);
else if (!strcasecmp(argv[1], "vdown"))
button = button_present(KEYBOARD_BUTTON_VOLUME_DOWN);
else
return EC_ERROR_PARAM1;
if (button == CONFIG_BUTTON_COUNT)
return EC_ERROR_PARAM1;
if (argc > 2) {
press_ms = strtoi(argv[2], &e, 0);
if (*e)
return EC_ERROR_PARAM2;
}
siml_btn_presd = 1;
/* Press the button */
button_interrupt_simulate(button);
/* Hold the button */
msleep(press_ms);
/* Release the button */
button_interrupt_simulate(button);
/* Wait till button processing is finished */
msleep(100);
siml_btn_presd = 0;
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(button, console_command_button,
"vup|vdown msec",
"Simulate button press");
#endif
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