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/* Copyright 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.
*/
/* Switch module for Chrome EC */
#include "common.h"
#include "console.h"
#include "flash.h"
#include "gpio.h"
#include "hooks.h"
#include "host_command.h"
#include "lid_switch.h"
#include "power_button.h"
#include "switch.h"
#include "util.h"
/* Console output macros */
#define CPUTS(outstr) cputs(CC_SWITCH, outstr)
#define CPRINTS(format, args...) cprints(CC_SWITCH, format, ## args)
static uint8_t *memmap_switches;
/**
* Update status of non-debounced switches.
*
* Note that deferred functions are called in the same context as lid and
* power button changes, so we don't need a mutex.
*/
static void switch_update(void)
{
static uint8_t prev;
/* Make sure this is safe to call before power_button_init() */
if (!memmap_switches)
return;
prev = *memmap_switches;
if (power_button_is_pressed())
*memmap_switches |= EC_SWITCH_POWER_BUTTON_PRESSED;
else
*memmap_switches &= ~EC_SWITCH_POWER_BUTTON_PRESSED;
#ifdef CONFIG_LID_SWITCH
if (lid_is_open())
*memmap_switches |= EC_SWITCH_LID_OPEN;
else
*memmap_switches &= ~EC_SWITCH_LID_OPEN;
#else
/* For lid-less systems, lid looks always open */
*memmap_switches |= EC_SWITCH_LID_OPEN;
#endif
if ((flash_get_protect() & EC_FLASH_PROTECT_GPIO_ASSERTED) == 0)
*memmap_switches |= EC_SWITCH_WRITE_PROTECT_DISABLED;
else
*memmap_switches &= ~EC_SWITCH_WRITE_PROTECT_DISABLED;
#ifdef CONFIG_SWITCH_DEDICATED_RECOVERY
if (gpio_get_level(GPIO_RECOVERY_L) == 0)
*memmap_switches |= EC_SWITCH_DEDICATED_RECOVERY;
else
*memmap_switches &= ~EC_SWITCH_DEDICATED_RECOVERY;
#endif
if (prev != *memmap_switches)
CPRINTS("SW 0x%02x", *memmap_switches);
}
DECLARE_DEFERRED(switch_update);
DECLARE_HOOK(HOOK_LID_CHANGE, switch_update, HOOK_PRIO_DEFAULT);
DECLARE_HOOK(HOOK_POWER_BUTTON_CHANGE, switch_update, HOOK_PRIO_DEFAULT);
static void switch_init(void)
{
/* Set up memory-mapped switch positions */
memmap_switches = host_get_memmap(EC_MEMMAP_SWITCHES);
*memmap_switches = 0;
switch_update();
/* Switch data is now present */
*host_get_memmap(EC_MEMMAP_SWITCHES_VERSION) = 1;
#ifdef CONFIG_SWITCH_DEDICATED_RECOVERY
/* Enable interrupts, now that we've initialized */
gpio_enable_interrupt(GPIO_RECOVERY_L);
#endif
/*
* TODO(crosbug.com/p/23793): It's weird that flash_common.c owns
* reading the write protect signal, but we enable the interrupt for it
* here. Take ownership of WP back, or refactor it to its own module.
*/
#ifdef CONFIG_WP_ACTIVE_HIGH
gpio_enable_interrupt(GPIO_WP);
#else
gpio_enable_interrupt(GPIO_WP_L);
#endif
}
DECLARE_HOOK(HOOK_INIT, switch_init, HOOK_PRIO_INIT_SWITCH);
void switch_interrupt(enum gpio_signal signal)
{
hook_call_deferred(&switch_update_data, 0);
}
#ifdef CONFIG_CMD_MMAPINFO
static int command_mmapinfo(int argc, char **argv)
{
uint8_t *memmap_switches = host_get_memmap(EC_MEMMAP_SWITCHES);
uint8_t val = *memmap_switches;
int i;
const char *explanation[] = {
"lid_open",
"powerbtn",
"wp_off",
"kbd_rec",
"gpio_rec",
"fake_dev",
};
ccprintf("memmap switches = 0x%x\n", val);
for (i = 0; i < ARRAY_SIZE(explanation); i++)
if (val & BIT(i))
ccprintf(" %s\n", explanation[i]);
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(mmapinfo, command_mmapinfo,
NULL,
"Print memmap switch state");
#endif
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