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/*
* ON pin driver for Dialog DA9052 PMICs
*
* Copyright(c) 2012 Dialog Semiconductor Ltd.
*
* Author: David Dajun Chen <dchen@diasemi.com>
*
* 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/init.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/reg.h>
struct da9052_onkey {
struct da9052 *da9052;
struct input_dev *input;
struct delayed_work work;
unsigned int irq;
};
static void da9052_onkey_query(struct da9052_onkey *onkey)
{
int key_stat;
key_stat = da9052_reg_read(onkey->da9052, DA9052_EVENT_B_REG);
if (key_stat < 0) {
dev_err(onkey->da9052->dev,
"Failed to read onkey event %d\n", key_stat);
} else {
/*
* Since interrupt for deassertion of ONKEY pin is not
* generated, onkey event state determines the onkey
* button state.
*/
key_stat &= DA9052_EVENTB_ENONKEY;
input_report_key(onkey->input, KEY_POWER, key_stat);
input_sync(onkey->input);
}
/*
* Interrupt is generated only when the ONKEY pin is asserted.
* Hence the deassertion of the pin is simulated through work queue.
*/
if (key_stat)
schedule_delayed_work(&onkey->work, msecs_to_jiffies(50));
}
static void da9052_onkey_work(struct work_struct *work)
{
struct da9052_onkey *onkey = container_of(work, struct da9052_onkey,
work.work);
da9052_onkey_query(onkey);
}
static irqreturn_t da9052_onkey_irq(int irq, void *data)
{
struct da9052_onkey *onkey = data;
da9052_onkey_query(onkey);
return IRQ_HANDLED;
}
static int __devinit da9052_onkey_probe(struct platform_device *pdev)
{
struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent);
struct da9052_onkey *onkey;
struct input_dev *input_dev;
int irq;
int error;
if (!da9052) {
dev_err(&pdev->dev, "Failed to get the driver's data\n");
return -EINVAL;
}
irq = platform_get_irq_byname(pdev, "ONKEY");
if (irq < 0) {
dev_err(&pdev->dev,
"Failed to get an IRQ for input device, %d\n", irq);
return -EINVAL;
}
onkey = kzalloc(sizeof(*onkey), GFP_KERNEL);
input_dev = input_allocate_device();
if (!onkey || !input_dev) {
dev_err(&pdev->dev, "Failed to allocate memory\n");
error = -ENOMEM;
goto err_free_mem;
}
onkey->input = input_dev;
onkey->da9052 = da9052;
onkey->irq = irq;
INIT_DELAYED_WORK(&onkey->work, da9052_onkey_work);
input_dev->name = "da9052-onkey";
input_dev->phys = "da9052-onkey/input0";
input_dev->dev.parent = &pdev->dev;
input_dev->evbit[0] = BIT_MASK(EV_KEY);
__set_bit(KEY_POWER, input_dev->keybit);
error = request_threaded_irq(onkey->irq, NULL, da9052_onkey_irq,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
"ONKEY", onkey);
if (error < 0) {
dev_err(onkey->da9052->dev,
"Failed to register ONKEY IRQ %d, error = %d\n",
onkey->irq, error);
goto err_free_mem;
}
error = input_register_device(onkey->input);
if (error) {
dev_err(&pdev->dev, "Unable to register input device, %d\n",
error);
goto err_free_irq;
}
platform_set_drvdata(pdev, onkey);
return 0;
err_free_irq:
free_irq(onkey->irq, onkey);
cancel_delayed_work_sync(&onkey->work);
err_free_mem:
input_free_device(input_dev);
kfree(onkey);
return error;
}
static int __devexit da9052_onkey_remove(struct platform_device *pdev)
{
struct da9052_onkey *onkey = platform_get_drvdata(pdev);
free_irq(onkey->irq, onkey);
cancel_delayed_work_sync(&onkey->work);
input_unregister_device(onkey->input);
kfree(onkey);
return 0;
}
static struct platform_driver da9052_onkey_driver = {
.probe = da9052_onkey_probe,
.remove = __devexit_p(da9052_onkey_remove),
.driver = {
.name = "da9052-onkey",
.owner = THIS_MODULE,
},
};
module_platform_driver(da9052_onkey_driver);
MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_DESCRIPTION("Onkey driver for DA9052");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9052-onkey");
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