linux power button
最近需要使用到power button按键,linux中有gpio keys的机制,只要注册即可。
device注册
arch/arm/mach-mx6/board-mx6q_sabresd.c
#define SABRESD_POWER_OFF IMX_GPIO_NR(3, 29)
static struct gpio_keys_button new_sabresd_buttons[] = {
GPIO_BUTTON(SABRESD_VOLUME_UP, KEY_VOLUMEUP, 1, "volume-up", 0, 1),
GPIO_BUTTON(SABRESD_VOLUME_DN, KEY_VOLUMEDOWN, 1, "volume-down", 0, 1),
GPIO_BUTTON(SABRESD_POWER_OFF, KEY_POWER, 1, "power-key", 1, 1),
};
static struct gpio_keys_platform_data new_sabresd_button_data = {
.buttons = new_sabresd_buttons,
.nbuttons = ARRAY_SIZE(new_sabresd_buttons),
};
static struct platform_device sabresd_button_device = {
.name = "gpio-keys",
.id = -1,
.num_resources = 0,
};
static void __init imx6q_add_device_buttons(void)
{
/* fix me */
/* For new sabresd(RevB4 ane above) change the
* ONOFF key(SW1) design, the SW1 now connect
* to GPIO_3_29, it can be use as a general power
* key that Android reuired. But those old sabresd
* such as RevB or older could not support this
* change, so it needs a way to distinguish different
* boards. Before board id/rev are defined cleary,
* there is a simple way to achive this, that is using
* SOC revison to identify differnt board revison.
*
* With the new sabresd change and SW mapping the
* SW1 as power key, below function related to power
* key are OK on new sabresd board(B4 or above).
* 1 Act as power button to power on the device when device is power off
* 2 Act as power button to power on the device(need keep press SW1 >5s)
* 3 Act as power key to let device suspend/resume
* 4 Act screenshort(hold power key and volume down key for 2s)
*/
platform_device_add_data(&sabresd_button_device,
&new_sabresd_button_data,
sizeof(new_sabresd_button_data));
platform_device_register(&sabresd_button_device);
}
static void __init mx6_sabresd_board_init(void)
{
......
imx6q_add_device_buttons();
......
}
driver
对应驱动代码
drivers/input/keyboard/gpio_keys.c
test
加载驱动之后,按住power key,却不能熄灭屏幕。由于是linux系统,与安卓有所不同,这一块的问题还没解决。
目前只是在文件系统层,使系统进入低功耗模式,power key就能够唤醒系统。不过这样每次都得手动操作才能使屏幕熄灭。
echo mem > /sys/power/state
echo standby > /sys/power/state
root@freescale /sys/power$ ll
-rw-r--r-- 1 root root 4096 Jan 1 00:15 device_suspend_time_threshold
-rw-r--r-- 1 root root 4096 Jan 1 00:15 pm_async
-rw-r--r-- 1 root root 4096 Jan 1 00:15 pm_test
-rw-r--r-- 1 root root 4096 Jan 1 00:15 state
-rw-r--r-- 1 root root 4096 Jan 1 00:15 wakeup_count
# 查看支持的模式
root@freescale /sys/power$ cat state
standby mem
# 使cpu进入standby模式 (或者mem模式), 此时屏幕熄灭
root@freescale /sys/power$ echo standby > state
PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.01 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
Suspending console(s) (use no_console_suspend to debug)
# 按住power key,屏幕又重新点亮
add wake up source irq 103
PM: suspend of devices complete after 3.163 msecs
PM: suspend devices took 0.010 seconds
PM: late suspend of devices complete after 0.701 msecs
Disabling non-boot CPUs ...
CPU1: shutdown
Suspended for 0.000 seconds
Enabling non-boot CPUs ...
CPU1: Booted secondary processor
Calibrating delay loop (skipped) already calibrated this CPU
i.MXC CPU frequency driver
CPU1 is up
PM: early resume of devices complete after 0.497 msecs
imx-ipuv3 imx-ipuv3.0: IPU DMFC NORMAL mode: 1(0~1), 5B(4,5), 5F(6,7)
remove wake up source irq 103
usb 2-1: reset high speed USB device number 2 using fsl-ehci
usb 2-1.1: reset low speed USB device number 3 using fsl-ehci
PM: resume of devices complete after 1357.464 msecs
PM: resume devices took 1.360 seconds
Restarting tasks ... done.
Tony Liu
2016-12-3, Shenzhen
linux power button的更多相关文章
- Ubuntu 拦截并监听 power button 的关机消息
system:ubuntu 18.04 platform:rockchip 3399 board:NanoPi M4 前言 物理上的电源按键短按之后,系统直接硬关机了,导致应用程序无法保护现场,就直接 ...
- Linux power supply class hacking
/*************************************************************************** * Linux power supply cl ...
- Linux Power Managment详解 【转】
转自:http://blog.chinaunix.net/uid-24517893-id-254740.html Linux Power Managment 谨以此文纪念过往的岁月 一.前言 在这个对 ...
- Tasker to answer incoming call by pressing power button
nowadays, the smartphone is getting bigger in size, eg. samsung galaxy note and note 2, sorta big in ...
- Linux Power(一): kernel/power/earlysuspend.c
/* kernel/power/earlysuspend.c * * Copyright (C) 2005-2008 Google, Inc. * * This software is license ...
- Linux power supply class(1)_软件架构及API汇整【转】
1. 前言 power supply class为编写供电设备(power supply,后面简称PSY)的驱动提供了统一的框架,功能包括: 1)抽象PSY设备的共性,向用户空间提供统一的API. 2 ...
- system(linux) power on note
读詹荣开文档摘 BIOS 在完成硬件检测和资源分配后,将硬盘 MBR 中的 Boot Loader 读到系统的 RAM 中,然后将控制权交给 OS Boot Loader Boot Loader执行全 ...
- Linux 驱动——Button驱动7(Timer)消抖
button_drv.c驱动文件: #include <linux/module.h>#include <linux/kernel.h>#include <linux/f ...
- Linux 驱动——Button驱动6(mutex、NBLOCK、O_NONBLOCK)互斥信号量、阻塞、非阻塞
button_drv.c驱动文件: #include <linux/module.h>#include <linux/kernel.h>#include <linux/f ...
随机推荐
- 移动端JS 触摸事件基础
一.手机上的触摸事件 基本事件: touchstart //手指刚接触屏幕时触发 touchmove //手指在屏幕上移动时触发 touchend //手指从屏幕上移开时触发 ...
- 【BZOJ】1202: [HNOI2005]狡猾的商人(并查集+前缀和)
http://www.lydsy.com/JudgeOnline/problem.php?id=1202 用并查集+前缀和. 前缀和从后向前维护和,并查集从前往后合并 对于询问l, r 如果l-1和r ...
- [ZT] Vim快捷键分类
一. 移动: h,j,k,l: 左,下,上,右. w: 下一个词的词首. e:下一个词的词尾. b:上一个词的词首. <>: v 模式选中后进行缩进.二. 跳 ...
- Apache Spark源码走读之9 -- Spark源码编译
欢迎转载,转载请注明出处,徽沪一郎. 概要 本来源码编译没有什么可说的,对于java项目来说,只要会点maven或ant的简单命令,依葫芦画瓢,一下子就ok了.但到了Spark上面,事情似乎不这么简单 ...
- iOS标准时间与时间戳相互转换
iOS标准时间与时间戳相互转换 (2012-07-18 17:03:34) 转载▼ 标签: ios 时间戳 标准时间 格式 设置 转化 杂谈 分类: iPhone开发 设置时间显示格式: NS ...
- RT-Thread 线程调度
/* 变量分配4字节对齐 */ ALIGN(RT_ALIGN_SIZE) /* 静态线程的 线程堆栈*/ ]; ]; /* 静态线程的 线程控制块 */ static struct rt_thread ...
- passing parameters by value is inefficient when the parameters represent large blocks of data
Computer Science An Overview _J. Glenn Brookshear _11th Edition_C Note that passing parameters by va ...
- Delphi 如何清除动态数组的内存?
SetLength(glb_IndexConfig,); FreeAndNil(glb_IndexConfig);
- hibernate 数据库列别名自动映射pojo属性名
package com.pccw.business.fcm.common.hibernate; import java.lang.reflect.Field; import java.math.Big ...
- OAuth的机制原理讲解及开发流程
本想前段时间就把自己通过QQ OAuth1.0.OAuth2.0协议进行验证而实现QQ登录的心得及Demo实例分享给大家,可一直很忙,今天抽点时间说下OAuth1.0协议原理,及讲解下QQ对于Oaut ...