linux耳机和耳机上按键的探测识别驱动原理【展讯8810平台】

 

=====================  headset.h =====================

 

/*
 * Copyright (C) 2012 Spreadtrum Communications Inc.
 * filename: headset.h
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 */

#ifndef __HEADSET_H__
#define __HEADSET_H__
enum {
 BIT_HEADSET_OUT = 0,
 BIT_HEADSET_MIC = (1 << 0),
 BIT_HEADSET_NO_MIC = (1 << 1),
};

struct _headset_gpio {
 int active_low;
 int gpio;
 int irq;
 unsigned int irq_type_active;
 unsigned int irq_type_inactive;
 int debounce;
 int debounce_sw;
 int holded;
 int active;
 int irq_enabled;
 const char *desc;
 struct _headset *parent;
 unsigned int timeout_ms;
 struct hrtimer timer;
 enum hrtimer_restart (*callback)(int active, struct _headset_gpio *hgp);
};

struct _headset {
 struct switch_dev sdev;
 struct input_dev *input;
 struct _headset_gpio detect;
 struct _headset_gpio button;
 int headphone;
};
#endif

 

 

=====================  headset.c =====================

 

/*
 * Copyright (C) 2012 Spreadtrum Communications Inc.
 * filename: headset.c
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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/interrupt.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/switch.h>
#include <linux/input.h>
#include <mach/gpio.h>
#include "headset.h"
#include <mach/board.h>

#define HEADSET_WITH_EIC

#ifdef HEADSET_WITH_EIC
#include <mach/eic.h>
#define HEADSET_DETECT_GPIO EIC_ID_13
#define HEADSET_BUTTON_GPIO EIC_ID_12

#define headset_gpio_init(gpio, desc) { }

#define headset_gpio_free(gpio) { }

#define headset_gpio2irq_free(irq, args) \
 sprd_free_eic_irq(irq)

#define headset_gpio2irq(gpio) \
 sprd_alloc_eic_irq(gpio)

#define headset_gpio_set_irq_type(irq, type) \
 set_irq_type(irq, type)

#define headset_gpio_get_value(gpio) \