pcf50633-input.c

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/* NXP PCF50633 Input Driver
 *
 * (C) 2006-2008 by Openmoko, Inc.
 * Author: Balaji Rao <[email protected]>
 * All rights reserved.
 *
 * Broken down from monstrous PCF50633 driver mainly by
 * Harald Welte, Andy Green and Werner Almesberger
 *
 *  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/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/slab.h>

#include <linux/mfd/pcf50633/core.h>

#define PCF50633_OOCSTAT_ONKEY  0x01
#define PCF50633_REG_OOCSTAT    0x12
#define PCF50633_REG_OOCMODE    0x10

struct pcf50633_input {
    struct pcf50633 *pcf;
    struct input_dev *input_dev;
};

static void
pcf50633_input_irq(int irq, void *data)
{
    struct pcf50633_input *input;
    int onkey_released;

    input = data;

    /* We report only one event depending on the key press status */
    onkey_released = pcf50633_reg_read(input->pcf, PCF50633_REG_OOCSTAT)
                        & PCF50633_OOCSTAT_ONKEY;

    if (irq == PCF50633_IRQ_ONKEYF && !onkey_released)
        input_report_key(input->input_dev, KEY_POWER, 1);
    else if (irq == PCF50633_IRQ_ONKEYR && onkey_released)
        input_report_key(input->input_dev, KEY_POWER, 0);

    input_sync(input->input_dev);
}

static int __devinit pcf50633_input_probe(struct platform_device *pdev)
{
    struct pcf50633_input *input;
    struct input_dev *input_dev;
    int ret;


    input = kzalloc(sizeof(*input), GFP_KERNEL);
    if (!input)
        return -ENOMEM;

    input_dev = input_allocate_device();
    if (!input_dev) {
        kfree(input);
        return -ENOMEM;
    }

    platform_set_drvdata(pdev, input);
    input->pcf = dev_to_pcf50633(pdev->dev.parent);
    input->input_dev = input_dev;

    input_dev->name = "PCF50633 PMU events";
    input_dev->id.bustype = BUS_I2C;
    input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_PWR);
    set_bit(KEY_POWER, input_dev->keybit);

    ret = input_register_device(input_dev);
    if (ret) {
        input_free_device(input_dev);
        kfree(input);
        return ret;
    }
    pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYR,
                pcf50633_input_irq, input);
    pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYF,
                pcf50633_input_irq, input);

    return 0;
}

static int __devexit pcf50633_input_remove(struct platform_device *pdev)
{
    struct pcf50633_input *input  = platform_get_drvdata(pdev);

    pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYR);
    pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYF);

    input_unregister_device(input->input_dev);
    kfree(input);

    return 0;
}

static struct platform_driver pcf50633_input_driver = {
    .driver = {
        .name = "pcf50633-input",
    },
    .probe = pcf50633_input_probe,
    .remove = __devexit_p(pcf50633_input_remove),
};
module_platform_driver(pcf50633_input_driver);

MODULE_AUTHOR("Balaji Rao <[email protected]>");
MODULE_DESCRIPTION("PCF50633 input driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pcf50633-input");