#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/firmware.h>
#include <linux/platform_device.h>
#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <linux/completion.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/slab.h>

#include <mach/irqs.h>
#include <mach/hardware.h>
#include <mach/common.h>
#include <mach/mux.h>

#include <asm/mach-types.h>
#include <asm/gpio.h>
#include <asm/io.h>

#ifdef CONFIG_PROC_FS
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#endif /* CONFIG_PROC_FS */

#define MODULE_NAME 		"factoryreset"
#define FACTORY_RESET_GPIO	GPIO(38)

static const char factoryreset_driver_version[] = "v1.0";

static int factoryReset = 0;
struct miscdevice *mdev = NULL;

#ifdef CONFIG_PROC_FS
static void *factoryreset_seq_start(struct seq_file *m, loff_t *pos)
{
	return *pos < 1 ? (void *)1 : NULL;
}

static void *factoryreset_seq_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return NULL;
}

static void factoryreset_seq_stop(struct seq_file *m, void *v)
{
}

static int factoryreset_proc_show(struct seq_file *m, void *v)
{
	seq_printf(m, "%d", factoryReset); 
	return 0;
}

static const struct seq_operations factoryreset_proc_op = {
	.start	= factoryreset_seq_start,
	.next	= factoryreset_seq_next,
	.stop	= factoryreset_seq_stop,
	.show	= factoryreset_proc_show
};

static int factoryreset_proc_open(struct inode *inode, struct file *file)
{
	int ret;
	struct seq_file *m;

	ret = seq_open(file, &factoryreset_proc_op);
	if (ret < 0)
		return ret;

	m = file->private_data;
	m->private = mdev;

	return 0;
}

static ssize_t factoryreset_proc_write(struct file *file, const char __user *buf,
			       size_t size, loff_t *ppos)
{
	char *kbuf;
	int ret = 0;

	if (size <= 1 || size >= PAGE_SIZE)
		return -EINVAL;

	kbuf = kmalloc(size + 1, GFP_KERNEL);
	if (!kbuf)
		return -ENOMEM;

	if (copy_from_user(kbuf, buf, size) != 0) {
		kfree(kbuf);
		return -EFAULT;
	}
	kbuf[size] = 0;
	factoryReset = simple_strtoul(kbuf, 0, 0);

	ret = size;
	kfree(kbuf);
	return ret;
}

static const struct file_operations factoryreset_proc_fops = {
	.open		= factoryreset_proc_open,
	.write		= factoryreset_proc_write,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
	.owner		= THIS_MODULE,
};

#endif /* CONFIG_PROC_FS */

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

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

static int factoryreset_read(struct file *filp, char *buf, size_t count, loff_t *ppos)
{
	int ret;
	ret = copy_to_user(buf, (void *)&factoryReset, 1);
	return 1;
}
 
static int factoryreset_write(struct file *filp, const char *buf, 
				size_t count, loff_t *ppos)
{
	if (copy_from_user((void *)&factoryReset, buf, 1) != 0) {  
       		return -EFAULT;  
	}
	return 1;
}

static const struct file_operations factoryreset_fops = {
	.open		= factoryreset_open,
	.release	= factoryreset_release,
	.read		= factoryreset_read,
	.write		= factoryreset_write,
	.owner		= THIS_MODULE,
};

static int factoryreset_probe(struct platform_device *pdev)
{
	int ret = -ENODEV;
	struct proc_dir_entry *ent;

	ret = gpio_request(FACTORY_RESET_GPIO, "factory_reset");
	if (ret != 0) {
		goto error;
	}
	ret = gpio_direction_input(FACTORY_RESET_GPIO);
	if (ret != 0) {
		goto error;
	}
	factoryReset = (gpio_get_value(FACTORY_RESET_GPIO) == 0);

	/* Alloc memory for the misc device */
	mdev = kzalloc(sizeof(struct miscdevice), GFP_KERNEL);
    	if (!mdev) {
		printk(KERN_ERR "factoryreset: Failed to allocate misc device structure\n");
		ret = -ENOMEM;
		goto error;
	}

	mdev->name  = MODULE_NAME;
	mdev->minor = MISC_DYNAMIC_MINOR;
	mdev->fops  = &factoryreset_fops;
	ret = misc_register(mdev);
	if (ret < 0) {
		printk(KERN_ERR "factoryreset: Error registering misc driver\n");
		goto error;
	}

	/* Create PROC Entry */
	#ifdef CONFIG_PROC_FS
	{
		ent = proc_create(MODULE_NAME, 0, NULL, &factoryreset_proc_fops);
		if (!ent) {
			printk(KERN_ERR "factoryreset: failed to create proc entry\n");
		}
	}	
	#endif

	printk(KERN_INFO "factoryreset: probed\n");
	return 0;

error:
	printk(KERN_ERR "factoryreset: probe failed\n");
	return ret;
}

static int factoryreset_remove(struct platform_device *pdev)
{
	#ifdef CONFIG_PROC_FS
	{
		remove_proc_entry(MODULE_NAME, NULL);
	}
	#endif

	if (mdev) {
		misc_deregister(mdev);
		kfree(mdev);
		mdev = NULL;
	}

	gpio_free(FACTORY_RESET_GPIO);
	return 0;
}

static void factoryreset_platform_release(struct device *device)
{
}

static struct platform_driver factoryreset_driver = {
	.probe = factoryreset_probe,
	.remove = factoryreset_remove,
	.driver = {
		.name = MODULE_NAME,
		.owner = THIS_MODULE,
	},
};

static struct platform_device factoryreset_pdevice = {
	.name 	= MODULE_NAME,
	.id 	= 1,
	.dev = {
		.release = factoryreset_platform_release,
	}
};

static int __init factoryreset_init(void)
{
	int err = 0;

	err =  platform_driver_register(&factoryreset_driver);
	if ( err <  0 ) {
		printk( KERN_ERR "Failed to register factoryreset driver\n" );
		return err;
	}

	err = platform_device_register(&factoryreset_pdevice);
	if ( err < 0 ) {
		platform_driver_unregister( &factoryreset_driver );
		printk( KERN_ERR "Failed to register factoryreset driver\n" );
		return err;
	}
	return err;
}

static void __exit factoryreset_cleanup(void)
{
	platform_device_unregister(&factoryreset_pdevice);
	platform_driver_unregister(&factoryreset_driver);
}

module_init(factoryreset_init);
module_exit(factoryreset_cleanup);

MODULE_DESCRIPTION("Factory Reset Driver");
MODULE_AUTHOR("Lyrtech RD Inc. <www.lyrtech.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" MODULE_NAME);