ab8500-ponkey.c
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/*
* Copyright (C) ST-Ericsson SA 2010
*
* License Terms: GNU General Public License v2
* Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
*
* AB8500 Power-On Key handler
*/
#include <linux/device.h>
#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 - ab8500 ponkey information
* @input_dev: pointer to input device
* @ab8500: ab8500 parent
* @irq_dbf: irq number for falling transition
* @irq_dbr: irq number for rising transition
*/
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 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 = devm_kzalloc(&pdev->dev, sizeof(struct ab8500_ponkey),
GFP_KERNEL);
if (!ponkey)
return -ENOMEM;
input = devm_input_allocate_device(&pdev->dev);
if (!input)
return -ENOMEM;
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 = devm_request_any_context_irq(&pdev->dev, 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);
return error;
}
error = devm_request_any_context_irq(&pdev->dev, 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);
return error;
}
error = input_register_device(ponkey->idev);
if (error) {
dev_err(ab8500->dev, "Can't register input device: %d\n", error);
return error;
}
platform_set_drvdata(pdev, ponkey);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id ab8500_ponkey_match[] = {
{ .compatible = "stericsson,ab8500-ponkey", },
{}
};
MODULE_DEVICE_TABLE(of, ab8500_ponkey_match);
#endif
static struct platform_driver ab8500_ponkey_driver = {
.driver = {
.name = "ab8500-poweron-key",
.of_match_table = of_match_ptr(ab8500_ponkey_match),
},
.probe = ab8500_ponkey_probe,
};
module_platform_driver(ab8500_ponkey_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver");