linux/drivers/input/misc/da9052_onkey.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

156 lines
3.6 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ON pin driver for Dialog DA9052 PMICs
*
* Copyright(c) 2012 Dialog Semiconductor Ltd.
*
* Author: David Dajun Chen <dchen@diasemi.com>
*/
#include <linux/input.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/reg.h>
struct da9052_onkey {
struct da9052 *da9052;
struct input_dev *input;
struct delayed_work work;
};
static void da9052_onkey_query(struct da9052_onkey *onkey)
{
int ret;
ret = da9052_reg_read(onkey->da9052, DA9052_STATUS_A_REG);
if (ret < 0) {
dev_err(onkey->da9052->dev,
"Failed to read onkey event err=%d\n", ret);
} else {
/*
* Since interrupt for deassertion of ONKEY pin is not
* generated, onkey event state determines the onkey
* button state.
*/
bool pressed = !(ret & DA9052_STATUSA_NONKEY);
input_report_key(onkey->input, KEY_POWER, pressed);
input_sync(onkey->input);
/*
* Interrupt is generated only when the ONKEY pin
* is asserted. Hence the deassertion of the pin
* is simulated through work queue.
*/
if (pressed)
schedule_delayed_work(&onkey->work,
msecs_to_jiffies(50));
}
}
static void da9052_onkey_work(struct work_struct *work)
{
struct da9052_onkey *onkey = container_of(work, struct da9052_onkey,
work.work);
da9052_onkey_query(onkey);
}
static irqreturn_t da9052_onkey_irq(int irq, void *data)
{
struct da9052_onkey *onkey = data;
da9052_onkey_query(onkey);
return IRQ_HANDLED;
}
static int da9052_onkey_probe(struct platform_device *pdev)
{
struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent);
struct da9052_onkey *onkey;
struct input_dev *input_dev;
int error;
if (!da9052) {
dev_err(&pdev->dev, "Failed to get the driver's data\n");
return -EINVAL;
}
onkey = kzalloc(sizeof(*onkey), GFP_KERNEL);
input_dev = input_allocate_device();
if (!onkey || !input_dev) {
dev_err(&pdev->dev, "Failed to allocate memory\n");
error = -ENOMEM;
goto err_free_mem;
}
onkey->input = input_dev;
onkey->da9052 = da9052;
INIT_DELAYED_WORK(&onkey->work, da9052_onkey_work);
input_dev->name = "da9052-onkey";
input_dev->phys = "da9052-onkey/input0";
input_dev->dev.parent = &pdev->dev;
input_dev->evbit[0] = BIT_MASK(EV_KEY);
__set_bit(KEY_POWER, input_dev->keybit);
error = da9052_request_irq(onkey->da9052, DA9052_IRQ_NONKEY, "ONKEY",
da9052_onkey_irq, onkey);
if (error < 0) {
dev_err(onkey->da9052->dev,
"Failed to register ONKEY IRQ: %d\n", error);
goto err_free_mem;
}
error = input_register_device(onkey->input);
if (error) {
dev_err(&pdev->dev, "Unable to register input device, %d\n",
error);
goto err_free_irq;
}
platform_set_drvdata(pdev, onkey);
return 0;
err_free_irq:
da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey);
cancel_delayed_work_sync(&onkey->work);
err_free_mem:
input_free_device(input_dev);
kfree(onkey);
return error;
}
static int da9052_onkey_remove(struct platform_device *pdev)
{
struct da9052_onkey *onkey = platform_get_drvdata(pdev);
da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey);
cancel_delayed_work_sync(&onkey->work);
input_unregister_device(onkey->input);
kfree(onkey);
return 0;
}
static struct platform_driver da9052_onkey_driver = {
.probe = da9052_onkey_probe,
.remove = da9052_onkey_remove,
.driver = {
.name = "da9052-onkey",
},
};
module_platform_driver(da9052_onkey_driver);
MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_DESCRIPTION("Onkey driver for DA9052");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9052-onkey");