arm ubuntu 按键关机的实现

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在arm ubuntu系统上，关机操作 可以用命令实现： poweroff 或者 shutdown，但是如果没有终端设备或者键盘，就无法使用命令行了，这里使用acpi机制，acpi监听power事件，来操作系统。

实现步骤：

1、驱动部分，首先要实现gpio-keys设备中，power键指定，就是用一个中断引脚，code类型定义为”KEY_POWER“

比如：

/* GPIO KEYS */
static struct gpio_keys_button smdk4412_button[] = {
	{
		<span style="color:#ff0000;">.code = KEY_POWER,</span>
		.gpio = EXYNOS4_GPX0(1),
		.desc = "gpio-keys: KEY_POWER",
		.type = EV_KEY,
		.active_low = 1,
		.debounce_interval = 1,
		.wakeup = 1,
	}, {
		.code = KEY_VOLUMEUP,//.code = KEY_LEFT,
		.gpio = EXYNOS4_GPX1(0),
		.desc = "gpio-keys: KEY_VOLUMEUP",
		.type = EV_KEY,
		.active_low = 1,
		.debounce_interval = 10,
	}, {
		.code = KEY_VOLUMEDOWN,//.code = KEY_DOWN,
		.gpio = EXYNOS4_GPX1(1),
		.desc = "gpio-keys: KEY_VOLUMEDOWN",
		.type = EV_KEY,
		.active_low = 1,
		.debounce_interval = 10,
 	}, 
};

static struct gpio_keys_platform_data smdk4x12_gpio_keys_data = {
	.buttons	= smdk4412_button,
	.nbuttons	= ARRAY_SIZE(smdk4412_button),
	.rep		= 1,
	.poll_interval	= 100,
};

static struct platform_device smdk4x12_gpio_keys = {
	.name	= "gpio-keys",
	.dev	= {
		.platform_data	= &smdk4x12_gpio_keys_data,
	},
};

驱动配置好以后，可以在系统中使用 cat /proc/interrupts 来检查按键触发是否正常

417:         50          0          0          0  exynos-eint  gpio-keys: KEY_POWER

2、驱动做好后，就可以安装acpi了，

运行命令： 

sudo apt-get update

sudo apt-get install apcid

备份/etc/acpi/powerbtn.sh

cp /etc/acpi/powerbtn.sh /etc/acpi/powerbtn.sh_bk

修改/etc/acpi/powerbtn.sh

只保留下面的部分

#!/bin/sh
# /etc/acpi/powerbtn.sh
# Initiates a shutdown when the power button has been
# pressed.
/sbin/shutdown -h now "Power button pressed"

service acpid stop
service acpid start

Broadcast message from root@yunz
        (unknown) at 20:20 ...

The system is going down for halt NOW!
Power button pressed
wait-for-state stop/waiting
 * Stopping rsync daemon rsync                                           [ OK ]
 * Stopping NTP server ntpd                                              [ OK ]
 * Asking all remaining processes to terminate...                        [ OK ]
 * All processes ended within 1 seconds...                               [ OK ]
ModemManager[667]: <warn>  Could not acquire the 'org.freedesktop.ModemManager1' service name

ModemManager[667]: <info>  ModemManager is shut down

 * Unmounting temporary filesystems...                                   [ OK ]
 * Deactivating swap...                                                  [ OK ]
 * Unmounting local filesystems...                                       [ OK ]
 * Will now halt
[   37.468376] exynos4-reboot: Notifier called
[   38.132085] Power down.
[   38.1330?OK

arm ubuntu 按键关机的实现

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原文地址：http://blog.csdn.net/liujia2100/article/details/47262233