/*
 * input_button.c
 *
 *  Created on: 2018年6月27日
 *      Author: anqi
 */



#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>  
#include <linux/cdev.h>  
#include <linux/device.h>  
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/sched.h>
#include <linux/pm.h>
#include <linux/bitops.h>

#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/arch/regs-gpio.h>

MODULE_LICENSE("Dual BSD/GPL");


typedef struct
{
	int irq;
	char *name;
	unsigned long pin;
	unsigned long key_val;
}btn_dev_t;

#define GPF0

static btn_dev_t key_desc[2] =
{
	{IRQ_ENT0, "s2", S3C2410_GPF0, BTN_0},
	{IRQ_ENT2, "s3", S3C2410_GPF2, BTN_0},
};

static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
{
	int  pinval;
	struct platform_device *pdev = dev_id;
	struct input_dev *input = platform_get_drvdata(pdev);

	for(int i = 0; i < 2; i++)
	{
		/*读gpio电平*/
		pinval = s3c2410_gpio_getpin(key_desc[i]->pin);
		if(pinval)
		{
			input_event(input, EV_KEY, key_desc[i].key_val, 1);
		}
		else
		{
			input_event(input, EV_KEY, key_desc[i].key_val, 0);
		}
		input_sync(input);
	}

	return IRQ_HANDLED;
}

int btn_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;

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

	platform_set_drvdata(pdev, input);//放input到drvdata里

	//1.input->evbit[0] = BIT_MASK(EV_KEY);
	//
	input->name = "btn_input";

	set_bit(EV_KEY, input->evbit); //支持key事件
	input_set_capability(input, EV_KEY, BTN_0);
	input_set_capability(input, EV_KEY, BTN_1);

//	input->open = gpio_keys_open;
//	input->close = gpio_keys_close;
//
//	input->id.bustype = BUS_HOST;
//	input->id.vendor = 0x0001;
//	input->id.product = 0x0001;
//	input->id.version = 0x0100;

	for(int i = 0; i < 2; i++)
	{
		request_irq(key_desc[i].irq, gpio_keys_isr, IRQF_TRIGGER_LOW, key_desc[i].name,
				pdev);
	}

	input_register_device(input);
	return 0;
}

int btn_remove(struct platform_device *pdev)
{
	for(int i = 0; i < 2; i++)
	{
		free_irq(key_desc[i].irq, pdev);
	}
	return 0;
}
struct platform_driver btn_drv =
{
	.probe = btn_probe,
	.remove = btn_remove,
	.driver = {
		.name = "btn_input",
		.owner = THIS_MODULE,
	},
};


static int __init btnInput_init(void)
{
	return platform_driver_register(&btn_drv);
}

static void __exit btnInput_exit(void)
{
	platform_driver_unregister(&btn_drv);
}

module_init(btnInput_init);
module_exit(btnInput_exit);

MODULE_AUTHOR("qian.gao");
MODULE_DESCRIPTION("btn input test");