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/*
* Texas Instruments' TPS65217 and TPS65218 Power Button Input Driver
*
* Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
* Author: Felipe Balbi <balbi@ti.com>
* Author: Marcin Niestroj <m.niestroj@grinn-global.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/tps65217.h>
#include <linux/mfd/tps65218.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
struct tps6521x_data {
unsigned int reg_status;
unsigned int pb_mask;
const char *name;
};
static const struct tps6521x_data tps65217_data = {
.reg_status = TPS65217_REG_STATUS,
.pb_mask = TPS65217_STATUS_PB,
.name = "tps65217_pwrbutton",
};
static const struct tps6521x_data tps65218_data = {
.reg_status = TPS65218_REG_STATUS,
.pb_mask = TPS65218_STATUS_PB_STATE,
.name = "tps65218_pwrbutton",
};
struct tps6521x_pwrbutton {
struct device *dev;
struct regmap *regmap;
struct input_dev *idev;
const struct tps6521x_data *data;
char phys[32];
};
static const struct of_device_id of_tps6521x_pb_match[] = {
{ .compatible = "ti,tps65217-pwrbutton", .data = &tps65217_data },
{ .compatible = "ti,tps65218-pwrbutton", .data = &tps65218_data },
{ },
};
MODULE_DEVICE_TABLE(of, of_tps6521x_pb_match);
static irqreturn_t tps6521x_pb_irq(int irq, void *_pwr)
{
struct tps6521x_pwrbutton *pwr = _pwr;
const struct tps6521x_data *tps_data = pwr->data;
unsigned int reg;
int error;
error = regmap_read(pwr->regmap, tps_data->reg_status, ®);
if (error) {
dev_err(pwr->dev, "can't read register: %d\n", error);
goto out;
}
if (reg & tps_data->pb_mask) {
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 tps6521x_pb_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct tps6521x_pwrbutton *pwr;
struct input_dev *idev;
const struct of_device_id *match;
int error;
int irq;
match = of_match_node(of_tps6521x_pb_match, pdev->dev.of_node);
if (!match)
return -ENXIO;
pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
if (!pwr)
return -ENOMEM;
pwr->data = match->data;
idev = devm_input_allocate_device(dev);
if (!idev)
return -ENOMEM;
idev->name = pwr->data->name;
snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0",
pwr->data->name);
idev->phys = pwr->phys;
idev->dev.parent = dev;
idev->id.bustype = BUS_I2C;
input_set_capability(idev, EV_KEY, KEY_POWER);
pwr->regmap = dev_get_regmap(pdev->dev.parent, NULL);
pwr->dev = dev;
pwr->idev = idev;
platform_set_drvdata(pdev, pwr);
device_init_wakeup(dev, true);
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(dev, "No IRQ resource!\n");
return -EINVAL;
}
error = devm_request_threaded_irq(dev, irq, NULL, tps6521x_pb_irq,
IRQF_TRIGGER_RISING |
IRQF_TRIGGER_FALLING |
IRQF_ONESHOT,
pwr->data->name, 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 struct platform_driver tps6521x_pb_driver = {
.probe = tps6521x_pb_probe,
.driver = {
.name = "tps6521x_pwrbutton",
.of_match_table = of_tps6521x_pb_match,
},
};
module_platform_driver(tps6521x_pb_driver);
MODULE_DESCRIPTION("TPS6521X Power Button");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
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