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/**
* CPCAP Power Button Input Driver
*
* Copyright (C) 2017 Sebastian Reichel <sre@kernel.org>
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file "COPYING" in the main directory of this
* archive for more details.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/regmap.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/mfd/motorola-cpcap.h>
#define CPCAP_IRQ_ON 23
#define CPCAP_IRQ_ON_BITMASK (1 << (CPCAP_IRQ_ON % 16))
struct cpcap_power_button {
struct regmap *regmap;
struct input_dev *idev;
struct device *dev;
};
static irqreturn_t powerbutton_irq(int irq, void *_button)
{
struct cpcap_power_button *button = _button;
int val;
val = cpcap_sense_virq(button->regmap, irq);
if (val < 0) {
dev_err(button->dev, "irq read failed: %d", val);
return IRQ_HANDLED;
}
pm_wakeup_event(button->dev, 0);
input_report_key(button->idev, KEY_POWER, val);
input_sync(button->idev);
return IRQ_HANDLED;
}
static int cpcap_power_button_probe(struct platform_device *pdev)
{
struct cpcap_power_button *button;
int irq = platform_get_irq(pdev, 0);
int err;
button = devm_kmalloc(&pdev->dev, sizeof(*button), GFP_KERNEL);
if (!button)
return -ENOMEM;
button->idev = devm_input_allocate_device(&pdev->dev);
if (!button->idev)
return -ENOMEM;
button->regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!button->regmap)
return -ENODEV;
button->dev = &pdev->dev;
button->idev->name = "cpcap-pwrbutton";
button->idev->phys = "cpcap-pwrbutton/input0";
button->idev->dev.parent = button->dev;
input_set_capability(button->idev, EV_KEY, KEY_POWER);
err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
powerbutton_irq, IRQF_ONESHOT, "cpcap_pwrbutton", button);
if (err < 0) {
dev_err(&pdev->dev, "IRQ request failed: %d\n", err);
return err;
}
err = input_register_device(button->idev);
if (err) {
dev_err(&pdev->dev, "Input register failed: %d\n", err);
return err;
}
device_init_wakeup(&pdev->dev, true);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id cpcap_pwrbutton_dt_match_table[] = {
{ .compatible = "motorola,cpcap-pwrbutton" },
{},
};
MODULE_DEVICE_TABLE(of, cpcap_pwrbutton_dt_match_table);
#endif
static struct platform_driver cpcap_power_button_driver = {
.probe = cpcap_power_button_probe,
.driver = {
.name = "cpcap-pwrbutton",
.of_match_table = of_match_ptr(cpcap_pwrbutton_dt_match_table),
},
};
module_platform_driver(cpcap_power_button_driver);
MODULE_ALIAS("platform:cpcap-pwrbutton");
MODULE_DESCRIPTION("CPCAP Power Button");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
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