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