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/* 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.
*/
/* Lid switch module for Chrome EC */
#include "common.h"
#include "console.h"
#include "gpio.h"
#include "hooks.h"
#include "host_command.h"
#include "lid_switch.h"
#include "timer.h"
#include "util.h"
/* Console output macros */
#define CPUTS(outstr) cputs(CC_SWITCH, outstr)
#define CPRINTS(format, args...) cprints(CC_SWITCH, format, ## args)
#define LID_DEBOUNCE_US (30 * MSEC) /* Debounce time for lid switch */
static int debounced_lid_open; /* Debounced lid state */
static int forced_lid_open; /* Forced lid open */
/**
* Get raw lid switch state.
*
* @return 1 if lid is open, 0 if closed.
*/
static int raw_lid_open(void)
{
return (forced_lid_open || gpio_get_level(GPIO_LID_OPEN)) ? 1 : 0;
}
/**
* Handle lid open.
*/
static void lid_switch_open(void)
{
if (debounced_lid_open) {
CPRINTS("lid already open");
return;
}
CPRINTS("lid open");
debounced_lid_open = 1;
hook_notify(HOOK_LID_CHANGE);
host_set_single_event(EC_HOST_EVENT_LID_OPEN);
}
/**
* Handle lid close.
*/
static void lid_switch_close(void)
{
if (!debounced_lid_open) {
CPRINTS("lid already closed");
return;
}
CPRINTS("lid close");
debounced_lid_open = 0;
hook_notify(HOOK_LID_CHANGE);
host_set_single_event(EC_HOST_EVENT_LID_CLOSED);
}
test_mockable int lid_is_open(void)
{
return debounced_lid_open;
}
/**
* Lid switch initialization code
*/
static void lid_init(void)
{
if (raw_lid_open())
debounced_lid_open = 1;
/* Enable interrupts, now that we've initialized */
gpio_enable_interrupt(GPIO_LID_OPEN);
}
DECLARE_HOOK(HOOK_INIT, lid_init, HOOK_PRIO_INIT_LID);
/**
* Handle debounced lid switch changing state.
*/
static void lid_change_deferred(void)
{
const int new_open = raw_lid_open();
/* If lid hasn't changed state, nothing to do */
if (new_open == debounced_lid_open)
return;
if (new_open)
lid_switch_open();
else
lid_switch_close();
}
DECLARE_DEFERRED(lid_change_deferred);
void lid_interrupt(enum gpio_signal signal)
{
/* Reset lid debounce time */
hook_call_deferred(lid_change_deferred, LID_DEBOUNCE_US);
}
static int command_lidopen(int argc, char **argv)
{
lid_switch_open();
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(lidopen, command_lidopen,
NULL,
"Simulate lid open",
NULL);
static int command_lidclose(int argc, char **argv)
{
lid_switch_close();
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(lidclose, command_lidclose,
NULL,
"Simulate lid close",
NULL);
/**
* Host command to enable/disable lid opened.
*/
static int hc_force_lid_open(struct host_cmd_handler_args *args)
{
const struct ec_params_force_lid_open *p = args->params;
/* Override lid open if necessary */
forced_lid_open = p->enabled ? 1 : 0;
/* Make this take effect immediately; no debounce time */
hook_call_deferred(lid_change_deferred, 0);
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_FORCE_LID_OPEN, hc_force_lid_open,
EC_VER_MASK(0));
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