按键 芯片pcf50633 linux 驱动程序

/* NXP PCF50633 Input Driver
*

• © 2006-2008 by Openmoko, Inc.
• All rights reserved.
• Broken down from monstrous PCF50633 driver mainly by
• Harald Welte, Andy Green and Werner Almesberger
• 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/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/slab.h>

#include <linux/mfd/pcf50633/core.h>

#define PCF50633_OOCSTAT_ONKEY 0x01
#define PCF50633_REG_OOCSTAT 0x12
#define PCF50633_REG_OOCMODE 0x10

struct pcf50633_input {
struct pcf50633 *pcf;
struct input_dev *input_dev;
};

static void
pcf50633_input_irq(int irq, void *data)
{
struct pcf50633_input *input;
int onkey_released;

input = data;

/* We report only one event depending on the key press status */
onkey_released = pcf50633_reg_read(input->pcf, PCF50633_REG_OOCSTAT)
					& PCF50633_OOCSTAT_ONKEY;

if (irq == PCF50633_IRQ_ONKEYF && !onkey_released)
	input_report_key(input->input_dev, KEY_POWER, 1);
else if (irq == PCF50633_IRQ_ONKEYR && onkey_released)
	input_report_key(input->input_dev, KEY_POWER, 0);

input_sync(input->input_dev);

}

static int pcf50633_input_probe(struct platform_device *pdev)
{
struct pcf50633_input *input;
struct input_dev *input_dev;
int ret;

input = kzalloc(sizeof(*input), GFP_KERNEL);
if (!input)
	return -ENOMEM;

input_dev = input_allocate_device();
if (!input_dev) {
	kfree(input);
	return -ENOMEM;
}

platform_set_drvdata(pdev, input);
input->pcf = dev_to_pcf50633(pdev->dev.parent);
input->input_dev = input_dev;

input_dev->name = "PCF50633 PMU events";
input_dev->id.bustype = BUS_I2C;
input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_PWR);
set_bit(KEY_POWER, input_dev->keybit);

ret = input_register_device(input_dev);
if (ret) {
	input_free_device(input_dev);
	kfree(input);
	return ret;
}
pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYR,
			pcf50633_input_irq, input);
pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYF,
			pcf50633_input_irq, input);

return 0;

}

static int pcf50633_input_remove(struct platform_device *pdev)
{
struct pcf50633_input *input = platform_get_drvdata(pdev);

pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYR);
pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYF);

input_unregister_device(input->input_dev);
kfree(input);

return 0;

}

static struct platform_driver pcf50633_input_driver = {
.driver = {
.name = “pcf50633-input”,
},
.probe = pcf50633_input_probe,
.remove = pcf50633_input_remove,
};
module_platform_driver(pcf50633_input_driver);

MODULE_AUTHOR(“xxx”);
MODULE_DESCRIPTION(“PCF50633 input driver”);
MODULE_LICENSE(“GPL”);
MODULE_ALIAS(“platform:pcf50633-input”);