ab8500-ponkey.c

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/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * License Terms: GNU General Public License v2
 * Author: Sundar Iyer <[email protected]> for ST-Ericsson
 *
 * AB8500 Power-On Key handler
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/mfd/abx500/ab8500.h>
#include <linux/of.h>
#include <linux/slab.h>

struct ab8500_ponkey {
    struct input_dev    *idev;
    struct ab8500       *ab8500;
    int         irq_dbf;
    int         irq_dbr;
};

/* AB8500 gives us an interrupt when ONKEY is held */
static irqreturn_t ab8500_ponkey_handler(int irq, void *data)
{
    struct ab8500_ponkey *ponkey = data;

    if (irq == ponkey->irq_dbf)
        input_report_key(ponkey->idev, KEY_POWER, true);
    else if (irq == ponkey->irq_dbr)
        input_report_key(ponkey->idev, KEY_POWER, false);

    input_sync(ponkey->idev);

    return IRQ_HANDLED;
}

static int __devinit ab8500_ponkey_probe(struct platform_device *pdev)
{
    struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
    struct ab8500_ponkey *ponkey;
    struct input_dev *input;
    int irq_dbf, irq_dbr;
    int error;

    irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF");
    if (irq_dbf < 0) {
        dev_err(&pdev->dev, "No IRQ for ONKEY_DBF, error=%d\n", irq_dbf);
        return irq_dbf;
    }

    irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR");
    if (irq_dbr < 0) {
        dev_err(&pdev->dev, "No IRQ for ONKEY_DBR, error=%d\n", irq_dbr);
        return irq_dbr;
    }

    ponkey = kzalloc(sizeof(struct ab8500_ponkey), GFP_KERNEL);
    input = input_allocate_device();
    if (!ponkey || !input) {
        error = -ENOMEM;
        goto err_free_mem;
    }

    ponkey->idev = input;
    ponkey->ab8500 = ab8500;
    ponkey->irq_dbf = irq_dbf;
    ponkey->irq_dbr = irq_dbr;

    input->name = "AB8500 POn(PowerOn) Key";
    input->dev.parent = &pdev->dev;

    input_set_capability(input, EV_KEY, KEY_POWER);

    error = request_any_context_irq(ponkey->irq_dbf, ab8500_ponkey_handler,
                    0, "ab8500-ponkey-dbf", ponkey);
    if (error < 0) {
        dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n",
            ponkey->irq_dbf, error);
        goto err_free_mem;
    }

    error = request_any_context_irq(ponkey->irq_dbr, ab8500_ponkey_handler,
                    0, "ab8500-ponkey-dbr", ponkey);
    if (error < 0) {
        dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n",
            ponkey->irq_dbr, error);
        goto err_free_dbf_irq;
    }

    error = input_register_device(ponkey->idev);
    if (error) {
        dev_err(ab8500->dev, "Can't register input device: %d\n", error);
        goto err_free_dbr_irq;
    }

    platform_set_drvdata(pdev, ponkey);
    return 0;

err_free_dbr_irq:
    free_irq(ponkey->irq_dbr, ponkey);
err_free_dbf_irq:
    free_irq(ponkey->irq_dbf, ponkey);
err_free_mem:
    input_free_device(input);
    kfree(ponkey);

    return error;
}

static int __devexit ab8500_ponkey_remove(struct platform_device *pdev)
{
    struct ab8500_ponkey *ponkey = platform_get_drvdata(pdev);

    free_irq(ponkey->irq_dbf, ponkey);
    free_irq(ponkey->irq_dbr, ponkey);
    input_unregister_device(ponkey->idev);
    kfree(ponkey);

    platform_set_drvdata(pdev, NULL);

    return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id ab8500_ponkey_match[] = {
    { .compatible = "stericsson,ab8500-ponkey", },
    {}
};
#endif

static struct platform_driver ab8500_ponkey_driver = {
    .driver     = {
        .name   = "ab8500-poweron-key",
        .owner  = THIS_MODULE,
        .of_match_table = of_match_ptr(ab8500_ponkey_match),
    },
    .probe      = ab8500_ponkey_probe,
    .remove     = __devexit_p(ab8500_ponkey_remove),
};
module_platform_driver(ab8500_ponkey_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Sundar Iyer <[email protected]>");
MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver");