/*
Driver for SIM508 modem power management
SK-AT91SAM9XXXXX-SIMXXX development board
www.starterkit.ru
*/

//#include <linux/config.h>
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include <asm/io.h>

#include <mach/gpio.h>

#define NAME "SK-AT91SAM9XXXXX-SIMXXX"

MODULE_AUTHOR("Pavel Ivanchenko <info@starterkit.ru>");
MODULE_DESCRIPTION("SIM508 power management driver");
MODULE_LICENSE("GPL");

static int major = 135; /* default to dynamic major */
module_param(major, int, 0);
MODULE_PARM_DESC(major, "Major device number");

static ssize_t at91sam9_gpio_write(struct file *file, const char __user *data,
size_t len, loff_t *ppos)
{
unsigned m = iminor(file->f_dentry->d_inode);
size_t i;

for (i = 0; i < len; ++i) {
char c;
if (get_user(c, data+i))
return -EFAULT;
switch (c)
{
case '0':
gpio_set_value(AT91_PIN_PC10,1);
printk(KERN_INFO NAME ": SIM508 GSM power key OFF.\n", m);
break;
case '1':
gpio_set_value(AT91_PIN_PC10,0);
printk(KERN_INFO NAME ": SIM508 GSM power key ON.\n", m);
break;
case '2':
gpio_set_value(AT91_PIN_PC5,0);
printk(KERN_INFO NAME ": SIM508 GPS power ON.\n", m);
break;
case '3':
gpio_set_value(AT91_PIN_PC5,1);
printk(KERN_INFO NAME ": SIM508 GPS power OFF.\n", m);
break;
}
}

return len;
}

static ssize_t at91sam9_gpio_read(struct file *file, char __user *buf,
size_t len, loff_t *ppos)
{
unsigned m = iminor(file->f_dentry->d_inode);
int value;

value=0;
if (put_user(value, buf))
return -EFAULT;

return 1;
}

static int at91sam9_gpio_open(struct inode *inode, struct file *file)
{
unsigned m = iminor(inode);
if (m > 63)
return -EINVAL;
return nonseekable_open(inode, file);
}

static int at91sam9_gpio_release(struct inode *inode, struct file *file)
{
return 0;
}


static struct file_operations at91sam9_gpio_fops = {
.owner = THIS_MODULE,
.write = at91sam9_gpio_write,
.read = at91sam9_gpio_read,
.open = at91sam9_gpio_open,
.release = at91sam9_gpio_release,
};

static int __init at91sam9_gpio_init(void)
{
int r;

printk(KERN_DEBUG NAME ": SIM508 power management driver, major %d, minor %d.\n",major,0);

/* if (!scx200_gpio_present()) {
printk(KERN_ERR NAME ": no SCx200 gpio pins available\n");
return -ENODEV;
}*/

r = register_chrdev(major, NAME, &at91sam9_gpio_fops);
if (r < 0) {
printk(KERN_ERR NAME ": unable to register character device\n");
return r;
}
if (!major) {
major = r;
printk(KERN_DEBUG NAME ": got dynamic major %d\n", major);
}

at91_set_GPIO_periph(AT91_PIN_PC10,1);
at91_set_GPIO_periph(AT91_PIN_PC5,1);
gpio_direction_output(AT91_PIN_PC10,1);
gpio_direction_output(AT91_PIN_PC5,1);
return 0;
}

static void __exit at91sam9_gpio_cleanup(void)
{
unregister_chrdev(major, NAME);
}

module_init(at91sam9_gpio_init);
module_exit(at91sam9_gpio_cleanup);

if (get_user(c, data+i))
return -EFAULT;

if (put_user(value, buf))
return -EFAULT;