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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/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/slab.h>
struct ab8500_ponkey_variant {
const char *irq_falling;
const char *irq_rising;
};
static const struct ab8500_ponkey_variant ab8500_ponkey = {
.irq_falling = "ONKEY_DBF",
.irq_rising = "ONKEY_DBR",
};
/**
* struct ab8500_ponkey_info - ab8500 ponkey information
* @input_dev: pointer to input device
* @irq_dbf: irq number for falling transition
* @irq_dbr: irq number for rising transition
*/
struct ab8500_ponkey_info {
struct input_dev *idev;
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_info *info = data;
if (irq == info->irq_dbf)
input_report_key(info->idev, KEY_POWER, true);
else if (irq == info->irq_dbr)
input_report_key(info->idev, KEY_POWER, false);
input_sync(info->idev);
return IRQ_HANDLED;
}
static int __devinit ab8500_ponkey_probe(struct platform_device *pdev)
{
const struct ab8500_ponkey_variant *variant;
struct ab8500_ponkey_info *info;
int irq_dbf, irq_dbr, ret;
variant = (const struct ab8500_ponkey_variant *)
pdev->id_entry->driver_data;
irq_dbf = platform_get_irq_byname(pdev, variant->irq_falling);
if (irq_dbf < 0) {
dev_err(&pdev->dev, "No IRQ for %s: %d\n",
variant->irq_falling, irq_dbf);
return irq_dbf;
}
irq_dbr = platform_get_irq_byname(pdev, variant->irq_rising);
if (irq_dbr < 0) {
dev_err(&pdev->dev, "No IRQ for %s: %d\n",
variant->irq_rising, irq_dbr);
return irq_dbr;
}
info = kzalloc(sizeof(struct ab8500_ponkey_info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->irq_dbf = irq_dbf;
info->irq_dbr = irq_dbr;
info->idev = input_allocate_device();
if (!info->idev) {
dev_err(&pdev->dev, "Failed to allocate input dev\n");
ret = -ENOMEM;
goto out;
}
info->idev->name = "AB8500 POn(PowerOn) Key";
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(&pdev->dev, "Can't register input device: %d\n", ret);
goto out_unfreedevice;
}
ret = request_threaded_irq(info->irq_dbf, NULL, ab8500_ponkey_handler,
IRQF_NO_SUSPEND, "ab8500-ponkey-dbf",
info);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n",
info->irq_dbf, ret);
goto out_unregisterdevice;
}
ret = request_threaded_irq(info->irq_dbr, NULL, ab8500_ponkey_handler,
IRQF_NO_SUSPEND, "ab8500-ponkey-dbr",
info);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to request dbr IRQ#%d: %d\n",
info->irq_dbr, ret);
goto out_irq_dbf;
}
platform_set_drvdata(pdev, info);
return 0;
out_irq_dbf:
free_irq(info->irq_dbf, info);
out_unregisterdevice:
input_unregister_device(info->idev);
info->idev = NULL;
out_unfreedevice:
input_free_device(info->idev);
out:
kfree(info);
return ret;
}
static int __devexit ab8500_ponkey_remove(struct platform_device *pdev)
{
struct ab8500_ponkey_info *info = platform_get_drvdata(pdev);
free_irq(info->irq_dbf, info);
free_irq(info->irq_dbr, info);
input_unregister_device(info->idev);
kfree(info);
return 0;
}
static struct platform_device_id ab8500_ponkey_id_table[] = {
{ "ab8500-poweron-key", (kernel_ulong_t)&ab8500_ponkey, },
{ },
};
MODULE_DEVICE_TABLE(platform, ab8500_ponkey_id_table);
static struct platform_driver ab8500_ponkey_driver = {
.driver = {
.name = "ab8500-poweron-key",
.owner = THIS_MODULE,
},
.id_table = ab8500_ponkey_id_table,
.probe = ab8500_ponkey_probe,
.remove = __devexit_p(ab8500_ponkey_remove),
};
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");
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