按键 芯片da9055 linux 驱动程序

/*

• ON pin driver for Dialog DA9055 PMICs
• Copyright© 2012 Dialog Semiconductor Ltd.
• 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/mfd/da9055/core.h>

#include <linux/mfd/da9055/reg.h>

struct da9055_onkey {

struct da9055 *da9055;

struct input_dev *input;

struct delayed_work work;

};

static void da9055_onkey_query(struct da9055_onkey *onkey)

{

int key_stat;

key_stat = da9055_reg_read(onkey->da9055, DA9055_REG_STATUS_A);
if (key_stat < 0) {
	dev_err(onkey->da9055->dev,
		"Failed to read onkey event %d\n", key_stat);
} else {
	key_stat &= DA9055_NOKEY_STS;
	/*
	 * Onkey status bit is cleared when onkey button is released.
	 */
	if (!key_stat) {
		input_report_key(onkey->input, KEY_POWER, 0);
		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 (key_stat)
	schedule_delayed_work(&onkey->work, msecs_to_jiffies(10));

}

static void da9055_onkey_work(struct work_struct *work)

{

struct da9055_onkey *onkey = container_of(work, struct da9055_onkey,

work.work);

da9055_onkey_query(onkey);

}

static irqreturn_t da9055_onkey_irq(int irq, void *data)

{

struct da9055_onkey *onkey = data;

input_report_key(onkey->input, KEY_POWER, 1);
input_sync(onkey->input);

da9055_onkey_query(onkey);

return IRQ_HANDLED;

}

static int da9055_onkey_probe(struct platform_device *pdev)

{

struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);

struct da9055_onkey *onkey;

struct input_dev *input_dev;

int irq, err;

irq = platform_get_irq_byname(pdev, "ONKEY");
if (irq < 0) {
	dev_err(&pdev->dev,
		"Failed to get an IRQ for input device, %d\n", irq);
	return -EINVAL;
}

onkey = devm_kzalloc(&pdev->dev, sizeof(*onkey), GFP_KERNEL);
if (!onkey) {
	dev_err(&pdev->dev, "Failed to allocate memory\n");
	return -ENOMEM;
}

input_dev = input_allocate_device();
if (!input_dev) {
	dev_err(&pdev->dev, "Failed to allocate memory\n");
	return -ENOMEM;
}

onkey->input = input_dev;
onkey->da9055 = da9055;
input_dev->name = "da9055-onkey";
input_dev->phys = "da9055-onkey/input0";
input_dev->dev.parent = &pdev->dev;

input_dev->evbit[0] = BIT_MASK(EV_KEY);
__set_bit(KEY_POWER, input_dev->keybit);

INIT_DELAYED_WORK(&onkey->work, da9055_onkey_work);

err = request_threaded_irq(irq, NULL, da9055_onkey_irq,
			   IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
			   "ONKEY", onkey);
if (err < 0) {
	dev_err(&pdev->dev,
		"Failed to register ONKEY IRQ %d, error = %d\n",
		irq, err);
	goto err_free_input;
}

err = input_register_device(input_dev);
if (err) {
	dev_err(&pdev->dev, "Unable to register input device, %d\n",
		err);
	goto err_free_irq;
}

platform_set_drvdata(pdev, onkey);

return 0;

err_free_irq:

free_irq(irq, onkey);

cancel_delayed_work_sync(&onkey->work);

err_free_input:

input_free_device(input_dev);

return err;

}

static int da9055_onkey_remove(struct platform_device *pdev)

{

struct da9055_onkey *onkey = platform_get_drvdata(pdev);

int irq = platform_get_irq_byname(pdev, "ONKEY");

irq = regmap_irq_get_virq(onkey->da9055->irq_data, irq);
free_irq(irq, onkey);
cancel_delayed_work_sync(&onkey->work);
input_unregister_device(onkey->input);

return 0;

}

static struct platform_driver da9055_onkey_driver = {

.probe = da9055_onkey_probe,

.remove = da9055_onkey_remove,

.driver = {

.name = "da9055-onkey",

},

};

module_platform_driver(da9055_onkey_driver);

MODULE_AUTHOR("xxx");

MODULE_DESCRIPTION("Onkey driver for DA9055");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:da9055-onkey");