118 lines
3 KiB
C
Executable file
118 lines
3 KiB
C
Executable file
/**
|
|
* 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>");
|