/* da9063-onkey.c - Onkey device driver for DA9063
 * Copyright (C) 2012  Dialog Semiconductor Ltd.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA  02110-1301, USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>

#include <linux/mfd/da9063/core.h>
#include <linux/mfd/da9063/pdata.h>
#include <linux/mfd/da9063/registers.h>


struct da9063_onkey {
	struct	da9063 *da9063;
	struct	input_dev *input;
	int irq;
	bool key_power;
};

static irqreturn_t da9063_onkey_irq_handler(int irq, void *data)
{
	struct da9063_onkey *onkey = data;
	unsigned int code;
	int ret;

	ret = da9063_reg_read(onkey->da9063, DA9063_REG_STATUS_A);
	/* only report POWER if the key_power option is supported by driver */
	if (onkey->key_power && (ret >= 0) && (ret & DA9063_NONKEY)) {
		dev_notice(&onkey->input->dev, "KEY_POWER pressed.\n");
		code = KEY_POWER;
	} else {
		dev_notice(&onkey->input->dev, "KEY_SLEEP pressed.\n");
		code = KEY_SLEEP;
	}

	/* Interrupt raised for key release only,
	   so report consecutive button press and release. */
	input_report_key(onkey->input, code, 1);
	input_report_key(onkey->input, code, 0);
	input_sync(onkey->input);

	return IRQ_HANDLED;
}

static int __devinit da9063_onkey_probe(struct platform_device *pdev)
{
	struct da9063 *da9063 = dev_get_drvdata(pdev->dev.parent);
	struct da9063_pdata *pdata = dev_get_platdata(da9063->dev);
	struct da9063_onkey *onkey;
	bool kp_tmp = true;
	int ret = 0;

	/* driver assumes CONFIG_I register is set to DA9063_NONKEY_PIN_SWDOWN */
	if( pdata ) 
		kp_tmp = pdata->key_power;

	if( !kp_tmp ) {
		dev_err(&pdev->dev, "Software power down key is not set.\n");
	}

	onkey = devm_kzalloc(&pdev->dev, sizeof(struct da9063_onkey),
			     GFP_KERNEL);
	if (!onkey) {
		dev_err(&pdev->dev, "Failed to allocate memory.\n");
		return -ENOMEM;
	}

	onkey->input = input_allocate_device();
	if (!onkey->input) {
		dev_err(&pdev->dev, "Failed to allocated input device.\n");
		return -ENOMEM;
	}

	onkey->irq = platform_get_irq_byname(pdev, DA9063_DRVNAME_ONKEY);
	onkey->da9063 = da9063;
	onkey->key_power = kp_tmp;
	onkey->input->evbit[0] = BIT_MASK(EV_KEY);
	onkey->input->name = DA9063_DRVNAME_ONKEY;
	onkey->input->phys = DA9063_DRVNAME_ONKEY "/input0";
	onkey->input->dev.parent = &pdev->dev;

	if( onkey->key_power )
		input_set_capability(onkey->input, EV_KEY, KEY_POWER);
	input_set_capability(onkey->input, EV_KEY, KEY_SLEEP);

	ret = request_threaded_irq(onkey->irq, NULL, da9063_onkey_irq_handler,
			IRQF_TRIGGER_LOW | IRQF_ONESHOT, "ONKEY", onkey);
	if (ret) {
		dev_err(&pdev->dev, "Failed to request IRQ.\n");
		goto err_input;
	}

	ret = input_register_device(onkey->input);
	if (ret) {
		dev_err(&pdev->dev, "Failed to request IRQ.\n");
		goto err_irq;
	}

	platform_set_drvdata(pdev, onkey);

	return 0;

err_irq:
	free_irq(onkey->da9063->irq_base + onkey->irq , onkey);
err_input:
	input_free_device(onkey->input);
	return ret;
}

static int __devexit da9063_onkey_remove(struct platform_device *pdev)
{
	struct	da9063_onkey *onkey = platform_get_drvdata(pdev);

	free_irq(onkey->irq, onkey);
	input_unregister_device(onkey->input);
	return 0;
}

static struct platform_driver da9063_onkey_driver = {
	.probe	= da9063_onkey_probe,
	.remove	= __devexit_p(da9063_onkey_remove),
	.driver	= {
		.name	= DA9063_DRVNAME_ONKEY,
		.owner	= THIS_MODULE,
	},
};

static int __init da9063_onkey_init(void)
{
	return platform_driver_register(&da9063_onkey_driver);
}
module_init(da9063_onkey_init);

static void __exit da9063_onkey_exit(void)
{
	platform_driver_unregister(&da9063_onkey_driver);
}
module_exit(da9063_onkey_exit);

MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
MODULE_DESCRIPTION("Onkey device driver for Dialog DA9063");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DA9063_DRVNAME_ONKEY);