pmic8xxx-pwrkey.c

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/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * 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/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/log2.h>

#include <linux/mfd/pm8xxx/core.h>
#include <linux/input/pmic8xxx-pwrkey.h>

#define PON_CNTL_1 0x1C
#define PON_CNTL_PULL_UP BIT(7)
#define PON_CNTL_TRIG_DELAY_MASK (0x7)

struct pmic8xxx_pwrkey {
    struct input_dev *pwr;
    int key_press_irq;
};

static irqreturn_t pwrkey_press_irq(int irq, void *_pwrkey)
{
    struct pmic8xxx_pwrkey *pwrkey = _pwrkey;

    input_report_key(pwrkey->pwr, KEY_POWER, 1);
    input_sync(pwrkey->pwr);

    return IRQ_HANDLED;
}

static irqreturn_t pwrkey_release_irq(int irq, void *_pwrkey)
{
    struct pmic8xxx_pwrkey *pwrkey = _pwrkey;

    input_report_key(pwrkey->pwr, KEY_POWER, 0);
    input_sync(pwrkey->pwr);

    return IRQ_HANDLED;
}

#ifdef CONFIG_PM_SLEEP
static int pmic8xxx_pwrkey_suspend(struct device *dev)
{
    struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);

    if (device_may_wakeup(dev))
        enable_irq_wake(pwrkey->key_press_irq);

    return 0;
}

static int pmic8xxx_pwrkey_resume(struct device *dev)
{
    struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);

    if (device_may_wakeup(dev))
        disable_irq_wake(pwrkey->key_press_irq);

    return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
        pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);

static int __devinit pmic8xxx_pwrkey_probe(struct platform_device *pdev)
{
    struct input_dev *pwr;
    int key_release_irq = platform_get_irq(pdev, 0);
    int key_press_irq = platform_get_irq(pdev, 1);
    int err;
    unsigned int delay;
    u8 pon_cntl;
    struct pmic8xxx_pwrkey *pwrkey;
    const struct pm8xxx_pwrkey_platform_data *pdata =
                    dev_get_platdata(&pdev->dev);

    if (!pdata) {
        dev_err(&pdev->dev, "power key platform data not supplied\n");
        return -EINVAL;
    }

    if (pdata->kpd_trigger_delay_us > 62500) {
        dev_err(&pdev->dev, "invalid power key trigger delay\n");
        return -EINVAL;
    }

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

    pwr = input_allocate_device();
    if (!pwr) {
        dev_dbg(&pdev->dev, "Can't allocate power button\n");
        err = -ENOMEM;
        goto free_pwrkey;
    }

    input_set_capability(pwr, EV_KEY, KEY_POWER);

    pwr->name = "pmic8xxx_pwrkey";
    pwr->phys = "pmic8xxx_pwrkey/input0";
    pwr->dev.parent = &pdev->dev;

    delay = (pdata->kpd_trigger_delay_us << 10) / USEC_PER_SEC;
    delay = 1 + ilog2(delay);

    err = pm8xxx_readb(pdev->dev.parent, PON_CNTL_1, &pon_cntl);
    if (err < 0) {
        dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
        goto free_input_dev;
    }

    pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
    pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
    if (pdata->pull_up)
        pon_cntl |= PON_CNTL_PULL_UP;
    else
        pon_cntl &= ~PON_CNTL_PULL_UP;

    err = pm8xxx_writeb(pdev->dev.parent, PON_CNTL_1, pon_cntl);
    if (err < 0) {
        dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
        goto free_input_dev;
    }

    err = input_register_device(pwr);
    if (err) {
        dev_dbg(&pdev->dev, "Can't register power key: %d\n", err);
        goto free_input_dev;
    }

    pwrkey->key_press_irq = key_press_irq;
    pwrkey->pwr = pwr;

    platform_set_drvdata(pdev, pwrkey);

    err = request_irq(key_press_irq, pwrkey_press_irq,
        IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_press", pwrkey);
    if (err < 0) {
        dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
                 key_press_irq, err);
        goto unreg_input_dev;
    }

    err = request_irq(key_release_irq, pwrkey_release_irq,
         IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_release", pwrkey);
    if (err < 0) {
        dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
                 key_release_irq, err);

        goto free_press_irq;
    }

    device_init_wakeup(&pdev->dev, pdata->wakeup);

    return 0;

free_press_irq:
    free_irq(key_press_irq, NULL);
unreg_input_dev:
    platform_set_drvdata(pdev, NULL);
    input_unregister_device(pwr);
    pwr = NULL;
free_input_dev:
    input_free_device(pwr);
free_pwrkey:
    kfree(pwrkey);
    return err;
}

static int __devexit pmic8xxx_pwrkey_remove(struct platform_device *pdev)
{
    struct pmic8xxx_pwrkey *pwrkey = platform_get_drvdata(pdev);
    int key_release_irq = platform_get_irq(pdev, 0);
    int key_press_irq = platform_get_irq(pdev, 1);

    device_init_wakeup(&pdev->dev, 0);

    free_irq(key_press_irq, pwrkey);
    free_irq(key_release_irq, pwrkey);
    input_unregister_device(pwrkey->pwr);
    platform_set_drvdata(pdev, NULL);
    kfree(pwrkey);

    return 0;
}

static struct platform_driver pmic8xxx_pwrkey_driver = {
    .probe      = pmic8xxx_pwrkey_probe,
    .remove     = __devexit_p(pmic8xxx_pwrkey_remove),
    .driver     = {
        .name   = PM8XXX_PWRKEY_DEV_NAME,
        .owner  = THIS_MODULE,
        .pm = &pm8xxx_pwr_key_pm_ops,
    },
};
module_platform_driver(pmic8xxx_pwrkey_driver);

MODULE_ALIAS("platform:pmic8xxx_pwrkey");
MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Trilok Soni <[email protected]>");