Linux下的Hall sensor驱动

最新推荐文章于 2025-10-10 17:28:48 发布

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最新推荐文章于 2025-10-10 17:28:48 发布 · 2.3k 阅读

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CC 4.0 BY-SA版权

本文介绍了一种Hall传感器驱动的移植方法，包括从GitHub获取开源代码、解析设备树配置、初始化输入设备、设置中断处理程序、配置电压调节器等关键步骤。

要移植hall sensor的驱动，但手上没有源码，只能自己写了，但能不能偷懒呢。在github上搜索一番，还真找到了，分享下。

https://github.com/Myself5/android_kernel_sony_msm8994_OM5Z_old/blob/master/drivers/input/hall_sensor.c

dts参考配置

hall {
	compatible = "hall-switch";
	linux,gpio-int=<&ap_gpio 45 1>;
	linux,wakeup;
	vddio=<&vddcama>;
	linux,max-uv=<2800>;
	linux,min-uv=<2800>;
};

如果sensor的电源是常供的，去掉vddiio，找不到该电源，系统会默认拿一路dummy的电源。

源码(原始代码只能亮屏不能灭屏，做了一下修改)

/*
 *
 * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/err.h>
#include <linux/errno.h>
#include <linux/input.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/pm.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>

#define	LID_DEV_NAME	"hall_sensor"
#define HALL_INPUT	"/dev/input/hall_dev"

struct hall_data {
	int gpio;	/* device use gpio number */
	int irq;	/* device request irq number */
	int active_low;	/* gpio active high or low for valid value */
	bool wakeup;

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