160 lines
3.8 KiB
C
160 lines
3.8 KiB
C
/*
|
|
* ON pin driver for Dialog DA9052 PMICs
|
|
*
|
|
* Copyright(c) 2012 Dialog Semiconductor Ltd.
|
|
*
|
|
* Author: David Dajun Chen <dchen@diasemi.com>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#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");
|