86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
/* 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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/* Backlight control based on lid and optional request signal from AP */
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#include "common.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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/**
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* Activate/Deactivate the backlight GPIO pin considering active high or low.
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*/
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void enable_backlight(int enabled)
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{
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#ifdef CONFIG_BACKLIGHT_LID_ACTIVE_LOW
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gpio_set_level(GPIO_ENABLE_BACKLIGHT_L, !enabled);
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#else
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gpio_set_level(GPIO_ENABLE_BACKLIGHT, enabled);
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#endif
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}
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/**
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* Update backlight state.
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*/
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static void update_backlight(void)
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{
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#ifdef CONFIG_BACKLIGHT_REQ_GPIO
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/* Enable the backlight if lid is open AND requested by AP */
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enable_backlight(lid_is_open() &&
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gpio_get_level(CONFIG_BACKLIGHT_REQ_GPIO));
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#else
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/*
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* Enable backlight if lid is open; this is AND'd with the request from
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* the AP in hardware.
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*/
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enable_backlight(lid_is_open());
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#endif
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}
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DECLARE_HOOK(HOOK_LID_CHANGE, update_backlight, HOOK_PRIO_DEFAULT);
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/**
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* Initialize backlight module.
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*/
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static void backlight_init(void)
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{
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update_backlight();
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#ifdef CONFIG_BACKLIGHT_REQ_GPIO
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gpio_enable_interrupt(CONFIG_BACKLIGHT_REQ_GPIO);
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#endif
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}
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DECLARE_HOOK(HOOK_INIT, backlight_init, HOOK_PRIO_DEFAULT);
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#ifdef CONFIG_BACKLIGHT_REQ_GPIO
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void backlight_interrupt(enum gpio_signal signal)
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{
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update_backlight();
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}
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#endif
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/**
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* Host command to toggle backlight.
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*
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* The requested state will persist until the next lid-switch or request-gpio
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* transition.
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*/
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static enum ec_status
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switch_command_enable_backlight(struct host_cmd_handler_args *args)
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{
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const struct ec_params_switch_enable_backlight *p = args->params;
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enable_backlight(p->enabled);
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return EC_RES_SUCCESS;
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}
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DECLARE_HOST_COMMAND(EC_CMD_SWITCH_ENABLE_BKLIGHT,
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switch_command_enable_backlight,
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EC_VER_MASK(0));
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