/*
 *  GSC3280 GW-JZQ GPRS 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 {
	GPRS_VCCON = 0,
	GPRS_VCCOFF,
	GPRS_POWERON,
	GPRS_POWEROFF,
	GPRS_RESET,
	GPRS_PCTRLON,
	GPRS_PCTRLOFF,
	GPRS_GET_STATUS,
};
enum {
	VCC = 0,
	POWER,
	PCTRL,
/*
	RESET,
	S0,
	S1,
	S2,
	S3,
	S4,
*/	MAX_PIN_NR,
};
struct gpio gprs_gpios[MAX_PIN_NR] = {
	{GSC3280_GPC(20), GPIOF_OUT_INIT_LOW, "GPRS VCC ON/OFF"},
	{GSC3280_GPB(26), GPIOF_OUT_INIT_HIGH, "GPRS POWER ON/OFF"},
	{GSC3280_GPB(27), GPIOF_OUT_INIT_LOW, "GPRS PCTRL ON/OFF"},
/*	{GSC3280_GPA(3), GPIOF_OUT_INIT_HIGH, "GPRS RESET"},
	{GSC3280_GPA(4), GPIOF_IN, "GPRS S0"},
	{GSC3280_GPA(5), GPIOF_IN, "GPRS S1"},
	{GSC3280_GPB(20), GPIOF_IN, "GPRS S2"},
	{GSC3280_GPB(21), GPIOF_IN, "GPRS S3"},
	{GSC3280_GPA(17), GPIOF_IN, "GPRS S4"}
*/
};
struct jzq_gprs {
	struct cdev cdev;
	struct class *gprs_class;
	dev_t dev;
};

struct jzq_gprs jzq_gprs_priv;

static long gprs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{

	switch(cmd) {
		case GPRS_VCCON:
			gpio_set_value(gprs_gpios[VCC].gpio, 1);
			break;
		case GPRS_VCCOFF:
			gpio_set_value(gprs_gpios[VCC].gpio, 0);
			break;
		case GPRS_POWERON:
			gpio_set_value(gprs_gpios[POWER].gpio, 0);
			msleep(1000);
			gpio_set_value(gprs_gpios[POWER].gpio, 1);
			break;
		case GPRS_POWEROFF:
			gpio_set_value(gprs_gpios[POWER].gpio, 0);
			msleep(3000);
			gpio_set_value(gprs_gpios[POWER].gpio, 1);
			break;
		case GPRS_PCTRLON:
			gpio_set_value(gprs_gpios[PCTRL].gpio, 1);
			break;
		case GPRS_PCTRLOFF:
			gpio_set_value(gprs_gpios[PCTRL].gpio, 0);
			break;
		case GPRS_RESET:
/*
			gpio_set_value(gprs_gpios[RESET].gpio, 0);
			msleep(200);
			gpio_set_value(gprs_gpios[RESET].gpio, 1);
*/
			break;
		case GPRS_GET_STATUS:
			//gpio_set_value(gprs_gpios[S0].gpio);
			break;
		default:
			return -ENOTTY;
	}

	return 0;
}

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

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

struct file_operations gprs_fops = {
	.owner			= THIS_MODULE,
	.unlocked_ioctl	= gprs_ioctl,
	.open			= gprs_open,
	.release		= gprs_release,
};
static int __init jzq_gprs_init(void)
{
	int err,ret;
	int result;
	int major;
	
	result = alloc_chrdev_region(&jzq_gprs_priv.dev, 0, 0, "gprs");
	major = MAJOR(jzq_gprs_priv.dev);
	if (result < 0) {
		printk(KERN_WARNING "jzq_gprs: can't get major %d\n", major);
		return result;
	}

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

	jzq_gprs_priv.gprs_class = class_create(THIS_MODULE, "gprs");
	if (IS_ERR(jzq_gprs_priv.gprs_class)) {
		printk(KERN_ERR "Failed in create gprs_cdev class\n");
		return -1;
	}
	
	device_create(jzq_gprs_priv.gprs_class, NULL, jzq_gprs_priv.dev, NULL, "gprs");
	
	ret = gpio_request_array(gprs_gpios, MAX_PIN_NR);
	if (ret < 0)
		return ret;
	return 0;
}

static void __exit jzq_gprs_exit(void)
{
	gpio_free_array(gprs_gpios, MAX_PIN_NR);
	cdev_del(&jzq_gprs_priv.cdev);
	unregister_chrdev_region(jzq_gprs_priv.dev, 1);
	device_destroy(jzq_gprs_priv.gprs_class, jzq_gprs_priv.dev);
	class_destroy(jzq_gprs_priv.gprs_class);
}


module_init(jzq_gprs_init);
module_exit(jzq_gprs_exit);


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