ckfwq/linux-3.0.4/drivers/char/jzq_yxinfo.c

/*
 *  GSC3280 GW-JZQ YX Driver
 *
 *  Copyright (C) 2013 BLX IC Design Corp.,Ltd.
 *  Author: Fei Lu, Lufei@china-cpu.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/types.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/rcupdate.h>
#include <linux/platform_device.h>
#include <linux/cdev.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/completion.h>
#include <asm/io.h>
#include <linux/fs.h>
#include <linux/fcntl.h>
#include <asm/uaccess.h>
#include <linux/gpio.h>
#include <gsc3280/gpio.h>

enum {
	YX1 = 0,
	YX2,
	YX3,
	YX4,
	DOOR,
	MAX_PIN_NR,
};
struct gpio yx_gpios[MAX_PIN_NR] = {
	{GSC3280_GPA(31), GPIOF_IN, "YX1"},
	{GSC3280_GPA(14), GPIOF_IN, "YX2"},
	{GSC3280_GPA(19), GPIOF_IN, "YX3"},
	{GSC3280_GPA(20), GPIOF_IN, "YX4"},
	{GSC3280_GPB(28), GPIOF_IN, "DOOR"},
};
struct jzq_yx {
	struct cdev cdev;
	struct class *yx_class;
	dev_t dev;
};

struct jzq_yx jzq_yx_priv;

static ssize_t yx_read ( struct file * pfile , char __user * pbuf , size_t size , loff_t * ppos )
{
	uint8_t buffer[5];
	buffer[0] = gpio_get_value(yx_gpios[YX1].gpio);
	buffer[1] = gpio_get_value(yx_gpios[YX2].gpio);
	buffer[2] = gpio_get_value(yx_gpios[YX3].gpio);
	buffer[3] = gpio_get_value(yx_gpios[YX4].gpio);
	buffer[4] = gpio_get_value(yx_gpios[DOOR].gpio);
	copy_to_user(pbuf, buffer, 5);
	return 5;
}

static int yx_open(struct inode *inode, struct file *filp) 
{
	return 0;
}

static int yx_release(struct inode *inode, struct file *filp)
{
	return 0;
}

struct file_operations yx_fops = {
	.owner			= THIS_MODULE,
	.read			= yx_read,
	.open			= yx_open,
	.release		= yx_release,
};
static int __init jzq_yx_init(void)
{
	int err,ret;
	int result;
	int major;
	
	result = alloc_chrdev_region(&jzq_yx_priv.dev, 0, 0, "yx");
	major = MAJOR(jzq_yx_priv.dev);
	if (result < 0) {
		printk(KERN_WARNING "jzq_yx: can't get major %d\n", major);
		return result;
	}

	cdev_init(&jzq_yx_priv.cdev, &yx_fops);
	jzq_yx_priv.cdev.owner = THIS_MODULE;
	jzq_yx_priv.cdev.ops = &yx_fops;
	
	err = cdev_add(&jzq_yx_priv.cdev, jzq_yx_priv.dev, 1);
	if (err) {
		printk(KERN_NOTICE "Error[%d] cdev_add .\n", err);
		return -1;
	}

	jzq_yx_priv.yx_class = class_create(THIS_MODULE, "yx");
	if (IS_ERR(jzq_yx_priv.yx_class)) {
		printk(KERN_ERR "Failed in create yx_cdev class\n");
		return -1;
	}
	
	device_create(jzq_yx_priv.yx_class, NULL, jzq_yx_priv.dev, NULL, "yx");
	
	ret = gpio_request_array(yx_gpios, MAX_PIN_NR);
	if (ret < 0)
		return ret;
	return 0;
}

static void __exit jzq_yx_exit(void)
{
	gpio_free_array(yx_gpios, MAX_PIN_NR);
	cdev_del(&jzq_yx_priv.cdev);
	unregister_chrdev_region(jzq_yx_priv.dev, 1);
	device_destroy(jzq_yx_priv.yx_class, jzq_yx_priv.dev);
	class_destroy(jzq_yx_priv.yx_class);
}


module_init(jzq_yx_init);
module_exit(jzq_yx_exit);


MODULE_AUTHOR("lufei@china-cpu.com");
MODULE_DESCRIPTION("GSC3280 GW-JZQ YX Driver");
MODULE_LICENSE("GPL");