linux-imx

/*

 * Copyright (C) 2011 Sony Ericsson Mobile Communications Inc.

 *

 * Author: Courtney Cavin <courtney.cavin@sonyericsson.com>

 * Prepared for up-stream by: Oskar Andero <oskar.andero@sonyericsson.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2, as

 * published by the Free Software Foundation.

 */

​

#include <linux/i2c.h>

#include <linux/irq.h>

#include <linux/slab.h>

#include <linux/input.h>

#include <linux/module.h>

#include <linux/interrupt.h>

#include <linux/gpio.h>

#include <linux/delay.h>

#include <linux/input/gp2ap002a00f.h>

​

struct gp2a_data {

    struct input_dev *input;

    const struct gp2a_platform_data *pdata;

    struct i2c_client *i2c_client;

};

​

enum gp2a_addr {

    GP2A_ADDR_PROX  = 0x0,

    GP2A_ADDR_GAIN  = 0x1,

    GP2A_ADDR_HYS   = 0x2,

    GP2A_ADDR_CYCLE = 0x3,

    GP2A_ADDR_OPMOD = 0x4,

    GP2A_ADDR_CON   = 0x6

};

​

enum gp2a_controls {

    /* Software Shutdown control: 0 = shutdown, 1 = normal operation */

    GP2A_CTRL_SSD   = 0x01

};

​

static int gp2a_report(struct gp2a_data *dt)

{

    int vo = gpio_get_value(dt->pdata->vout_gpio);

​

    input_report_switch(dt->input, SW_FRONT_PROXIMITY, !vo);

    input_sync(dt->input);

​

    return 0;

}

​

static irqreturn_t gp2a_irq(int irq, void *handle)

{

    struct gp2a_data *dt = handle;

​

    gp2a_report(dt);

​

    return IRQ_HANDLED;

}

​

static int gp2a_enable(struct gp2a_data *dt)

{

    return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD,

                     GP2A_CTRL_SSD);

}

​

static int gp2a_disable(struct gp2a_data *dt)

{

    return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD,

                     0x00);

}

​

static int gp2a_device_open(struct input_dev *dev)

{

    struct gp2a_data *dt = input_get_drvdata(dev);

    int error;

​

    error = gp2a_enable(dt);

    if (error < 0) {

        dev_err(&dt->i2c_client->dev,

            "unable to activate, err %d\n", error);

        return error;

    }

​

    gp2a_report(dt);

​

    return 0;

}

​

static void gp2a_device_close(struct input_dev *dev)

{

    struct gp2a_data *dt = input_get_drvdata(dev);