88pm860x_onkey.c

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/*
 * 88pm860x_onkey.c - Marvell 88PM860x ONKEY driver
 *
 * Copyright (C) 2009-2010 Marvell International Ltd.
 *      Haojian Zhuang <[email protected]>
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License. See the file "COPYING" in the main directory of this
 * archive for more details.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/mfd/88pm860x.h>
#include <linux/slab.h>

#define PM8607_WAKEUP       0x0b

#define LONG_ONKEY_EN       (1 << 1)
#define ONKEY_STATUS        (1 << 0)

struct pm860x_onkey_info {
    struct input_dev    *idev;
    struct pm860x_chip  *chip;
    struct i2c_client   *i2c;
    struct device       *dev;
    int         irq;
};

/* 88PM860x gives us an interrupt when ONKEY is held */
static irqreturn_t pm860x_onkey_handler(int irq, void *data)
{
    struct pm860x_onkey_info *info = data;
    int ret;

    ret = pm860x_reg_read(info->i2c, PM8607_STATUS_2);
    ret &= ONKEY_STATUS;
    input_report_key(info->idev, KEY_POWER, ret);
    input_sync(info->idev);

    /* Enable 8-second long onkey detection */
    pm860x_set_bits(info->i2c, PM8607_WAKEUP, 3, LONG_ONKEY_EN);
    return IRQ_HANDLED;
}

static int __devinit pm860x_onkey_probe(struct platform_device *pdev)
{
    struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
    struct pm860x_onkey_info *info;
    int irq, ret;

    irq = platform_get_irq(pdev, 0);
    if (irq < 0) {
        dev_err(&pdev->dev, "No IRQ resource!\n");
        return -EINVAL;
    }

    info = kzalloc(sizeof(struct pm860x_onkey_info), GFP_KERNEL);
    if (!info)
        return -ENOMEM;
    info->chip = chip;
    info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
    info->dev = &pdev->dev;
    info->irq = irq;

    info->idev = input_allocate_device();
    if (!info->idev) {
        dev_err(chip->dev, "Failed to allocate input dev\n");
        ret = -ENOMEM;
        goto out;
    }

    info->idev->name = "88pm860x_on";
    info->idev->phys = "88pm860x_on/input0";
    info->idev->id.bustype = BUS_I2C;
    info->idev->dev.parent = &pdev->dev;
    info->idev->evbit[0] = BIT_MASK(EV_KEY);
    info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);

    ret = input_register_device(info->idev);
    if (ret) {
        dev_err(chip->dev, "Can't register input device: %d\n", ret);
        goto out_reg;
    }

    ret = request_threaded_irq(info->irq, NULL, pm860x_onkey_handler,
                   IRQF_ONESHOT, "onkey", info);
    if (ret < 0) {
        dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
            info->irq, ret);
        goto out_irq;
    }

    platform_set_drvdata(pdev, info);
    device_init_wakeup(&pdev->dev, 1);

    return 0;

out_irq:
    input_unregister_device(info->idev);
    kfree(info);
    return ret;

out_reg:
    input_free_device(info->idev);
out:
    kfree(info);
    return ret;
}

static int __devexit pm860x_onkey_remove(struct platform_device *pdev)
{
    struct pm860x_onkey_info *info = platform_get_drvdata(pdev);

    free_irq(info->irq, info);
    input_unregister_device(info->idev);
    kfree(info);
    return 0;
}

#ifdef CONFIG_PM_SLEEP
static int pm860x_onkey_suspend(struct device *dev)
{
    struct platform_device *pdev = to_platform_device(dev);
    struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);

    if (device_may_wakeup(dev))
        chip->wakeup_flag |= 1 << PM8607_IRQ_ONKEY;
    return 0;
}
static int pm860x_onkey_resume(struct device *dev)
{
    struct platform_device *pdev = to_platform_device(dev);
    struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);

    if (device_may_wakeup(dev))
        chip->wakeup_flag &= ~(1 << PM8607_IRQ_ONKEY);
    return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(pm860x_onkey_pm_ops, pm860x_onkey_suspend, pm860x_onkey_resume);

static struct platform_driver pm860x_onkey_driver = {
    .driver     = {
        .name   = "88pm860x-onkey",
        .owner  = THIS_MODULE,
        .pm = &pm860x_onkey_pm_ops,
    },
    .probe      = pm860x_onkey_probe,
    .remove     = __devexit_p(pm860x_onkey_remove),
};
module_platform_driver(pm860x_onkey_driver);

MODULE_DESCRIPTION("Marvell 88PM860x ONKEY driver");
MODULE_AUTHOR("Haojian Zhuang <[email protected]>");
MODULE_LICENSE("GPL");