/*
* Texas Instruments' TPS65218 Power Button Input Driver
*
* Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
* Author: Felipe Balbi <balbi@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/tps65218.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
struct tps65218_pwrbutton {
struct device *dev;
struct tps65218 *tps;
struct input_dev *idev;
};
static irqreturn_t tps65218_pwr_irq(int irq, void *_pwr)
{
struct tps65218_pwrbutton *pwr = _pwr;
unsigned int reg;
int error;
error = tps65218_reg_read(pwr->tps, TPS65218_REG_STATUS, ®);
if (error) {
dev_err(pwr->dev, "can't read register: %d\n", error);
goto out;
}
if (reg & TPS65218_STATUS_PB_STATE) {
input_report_key(pwr->idev, KEY_POWER, 1);
pm_wakeup_event(pwr->dev, 0);
} else {
input_report_key(pwr->idev, KEY_POWER, 0);
}
input_sync(pwr->idev);
out:
return IRQ_HANDLED;
}
static int tps65218_pwron_probe(struct platform_device *pdev)
{
struct tps65218 *tps = dev_get_drvdata(pdev->dev.parent);
struct device *dev = &pdev->dev;
struct tps65218_pwrbutton *pwr;
struct input_dev *idev;
int error;
int irq;
pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
if (!pwr)
return -ENOMEM;
idev = devm_input_allocate_device(dev);
if (!idev)
return -ENOMEM;
idev->name = "tps65218_pwrbutton";
idev->phys = "tps65218_pwrbutton/input0";
idev->dev.parent = dev;
idev->id.bustype = BUS_I2C;
input_set_capability(idev, EV_KEY, KEY_POWER);
pwr->tps = tps;
pwr->dev = dev;
pwr->idev = idev;
platform_set_drvdata(pdev, pwr);
device_init_wakeup(dev, true);
irq = platform_get_irq(pdev, 0);
error = devm_request_threaded_irq(dev, irq, NULL, tps65218_pwr_irq,
IRQF_TRIGGER_RISING |
IRQF_TRIGGER_FALLING |
IRQF_ONESHOT,
"tps65218-pwrbutton", pwr);
if (error) {
dev_err(dev, "failed to request IRQ #%d: %d\n",
irq, error);
return error;
}
error= input_register_device(idev);
if (error) {
dev_err(dev, "Can't register power button: %d\n", error);
return error;
}
return 0;
}
static const struct of_device_id of_tps65218_pwr_match[] = {
{ .compatible = "ti,tps65218-pwrbutton" },
{ },
};
MODULE_DEVICE_TABLE(of, of_tps65218_pwr_match);
static struct platform_driver tps65218_pwron_driver = {
.probe = tps65218_pwron_probe,
.driver = {
.name = "tps65218_pwrbutton",
.of_match_table = of_tps65218_pwr_match,
},
};
module_platform_driver(tps65218_pwron_driver);
MODULE_DESCRIPTION("TPS65218 Power Button");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
