linux-imx

/*

 * ON pin driver for Dialog DA9055 PMICs

 *

 * Copyright(c) 2012 Dialog Semiconductor Ltd.

 *

 * Author: David Dajun Chen <dchen@diasemi.com>

 *

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

 * under  the terms of  the GNU General  Public License as published by the

 * Free Software Foundation;  either version 2 of the  License, or (at your

 * option) any later version.

 */

​

#include <linux/input.h>

#include <linux/module.h>

#include <linux/platform_device.h>

​

#include <linux/mfd/da9055/core.h>

#include <linux/mfd/da9055/reg.h>

​

struct da9055_onkey {

    struct da9055 *da9055;

    struct input_dev *input;

    struct delayed_work work;

};

​

static void da9055_onkey_query(struct da9055_onkey *onkey)

{

    int key_stat;

​

    key_stat = da9055_reg_read(onkey->da9055, DA9055_REG_STATUS_A);

    if (key_stat < 0) {

        dev_err(onkey->da9055->dev,

            "Failed to read onkey event %d\n", key_stat);

    } else {

        key_stat &= DA9055_NOKEY_STS;

        /*

         * Onkey status bit is cleared when onkey button is released.

         */

        if (!key_stat) {

            input_report_key(onkey->input, KEY_POWER, 0);

            input_sync(onkey->input);

        }

    }

​

    /*

     * Interrupt is generated only when the ONKEY pin is asserted.

     * Hence the deassertion of the pin is simulated through work queue.

     */

    if (key_stat)

        schedule_delayed_work(&onkey->work, msecs_to_jiffies(10));

​

}

​

static void da9055_onkey_work(struct work_struct *work)

{

    struct da9055_onkey *onkey = container_of(work, struct da9055_onkey,

                          work.work);

​

    da9055_onkey_query(onkey);

}

​

static irqreturn_t da9055_onkey_irq(int irq, void *data)