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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) STMicroelectronics 2018
// Author: Pascal Paillet <p.paillet@st.com> for STMicroelectronics.
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/mfd/stpmic1.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/regmap.h>
/**
* struct stpmic1_onkey - OnKey data
* @input_dev: pointer to input device
* @irq_falling: irq that we are hooked on to
* @irq_rising: irq that we are hooked on to
*/
struct stpmic1_onkey {
struct input_dev *input_dev;
int irq_falling;
int irq_rising;
};
static irqreturn_t onkey_falling_irq(int irq, void *ponkey)
{
struct stpmic1_onkey *onkey = ponkey;
struct input_dev *input_dev = onkey->input_dev;
input_report_key(input_dev, KEY_POWER, 1);
pm_wakeup_event(input_dev->dev.parent, 0);
input_sync(input_dev);
return IRQ_HANDLED;
}
static irqreturn_t onkey_rising_irq(int irq, void *ponkey)
{
struct stpmic1_onkey *onkey = ponkey;
struct input_dev *input_dev = onkey->input_dev;
input_report_key(input_dev, KEY_POWER, 0);
pm_wakeup_event(input_dev->dev.parent, 0);
input_sync(input_dev);
return IRQ_HANDLED;
}
static int stpmic1_onkey_probe(struct platform_device *pdev)
{
struct stpmic1 *pmic = dev_get_drvdata(pdev->dev.parent);
struct device *dev = &pdev->dev;
struct input_dev *input_dev;
struct stpmic1_onkey *onkey;
unsigned int val, reg = 0;
int error;
onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
if (!onkey)
return -ENOMEM;
onkey->irq_falling = platform_get_irq_byname(pdev, "onkey-falling");
if (onkey->irq_falling < 0)
return onkey->irq_falling;
onkey->irq_rising = platform_get_irq_byname(pdev, "onkey-rising");
if (onkey->irq_rising < 0)
return onkey->irq_rising;
if (!device_property_read_u32(dev, "power-off-time-sec", &val)) {
if (val > 0 && val <= 16) {
dev_dbg(dev, "power-off-time=%d seconds\n", val);
reg |= PONKEY_PWR_OFF;
reg |= ((16 - val) & PONKEY_TURNOFF_TIMER_MASK);
} else {
dev_err(dev, "power-off-time-sec out of range\n");
return -EINVAL;
}
}
if (device_property_present(dev, "st,onkey-clear-cc-flag"))
reg |= PONKEY_CC_FLAG_CLEAR;
error = regmap_update_bits(pmic->regmap, PKEY_TURNOFF_CR,
PONKEY_TURNOFF_MASK, reg);
if (error) {
dev_err(dev, "PKEY_TURNOFF_CR write failed: %d\n", error);
return error;
}
if (device_property_present(dev, "st,onkey-pu-inactive")) {
error = regmap_update_bits(pmic->regmap, PADS_PULL_CR,
PONKEY_PU_INACTIVE,
PONKEY_PU_INACTIVE);
if (error) {
dev_err(dev, "ONKEY Pads configuration failed: %d\n",
error);
return error;
}
}
input_dev = devm_input_allocate_device(dev);
if (!input_dev) {
dev_err(dev, "Can't allocate Pwr Onkey Input Device\n");
return -ENOMEM;
}
input_dev->name = "pmic_onkey";
input_dev->phys = "pmic_onkey/input0";
input_set_capability(input_dev, EV_KEY, KEY_POWER);
onkey->input_dev = input_dev;
/* interrupt is nested in a thread */
error = devm_request_threaded_irq(dev, onkey->irq_falling, NULL,
onkey_falling_irq, IRQF_ONESHOT,
dev_name(dev), onkey);
if (error) {
dev_err(dev, "Can't get IRQ Onkey Falling: %d\n", error);
return error;
}
error = devm_request_threaded_irq(dev, onkey->irq_rising, NULL,
onkey_rising_irq, IRQF_ONESHOT,
dev_name(dev), onkey);
if (error) {
dev_err(dev, "Can't get IRQ Onkey Rising: %d\n", error);
return error;
}
error = input_register_device(input_dev);
if (error) {
dev_err(dev, "Can't register power button: %d\n", error);
return error;
}
platform_set_drvdata(pdev, onkey);
device_init_wakeup(dev, true);
return 0;
}
static int stpmic1_onkey_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct stpmic1_onkey *onkey = platform_get_drvdata(pdev);
if (device_may_wakeup(dev)) {
enable_irq_wake(onkey->irq_falling);
enable_irq_wake(onkey->irq_rising);
}
return 0;
}
static int stpmic1_onkey_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct stpmic1_onkey *onkey = platform_get_drvdata(pdev);
if (device_may_wakeup(dev)) {
disable_irq_wake(onkey->irq_falling);
disable_irq_wake(onkey->irq_rising);
}
return 0;
}
static DEFINE_SIMPLE_DEV_PM_OPS(stpmic1_onkey_pm,
stpmic1_onkey_suspend,
stpmic1_onkey_resume);
static const struct of_device_id of_stpmic1_onkey_match[] = {
{ .compatible = "st,stpmic1-onkey" },
{ },
};
MODULE_DEVICE_TABLE(of, of_stpmic1_onkey_match);
static struct platform_driver stpmic1_onkey_driver = {
.probe = stpmic1_onkey_probe,
.driver = {
.name = "stpmic1_onkey",
.of_match_table = of_match_ptr(of_stpmic1_onkey_match),
.pm = pm_sleep_ptr(&stpmic1_onkey_pm),
},
};
module_platform_driver(stpmic1_onkey_driver);
MODULE_DESCRIPTION("Onkey driver for STPMIC1");
MODULE_AUTHOR("Pascal Paillet <p.paillet@st.com>");
MODULE_LICENSE("GPL v2");
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