mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-27 20:58:59 +02:00
295c04e6cd
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@10708 3c298f89-4303-0410-b956-a3cf2f4a3e73
159 lines
3.3 KiB
C
159 lines
3.3 KiB
C
/*
|
|
* Copyright (C) 2007 Nicolas Thill <nico@openwrt.org>
|
|
*
|
|
* 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.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/module.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/io.h>
|
|
#include <linux/types.h>
|
|
#include <linux/cdev.h>
|
|
#include <gpio.h>
|
|
|
|
#define DRVNAME "ar7_gpio"
|
|
#define LONGNAME "TI AR7 GPIOs Driver"
|
|
|
|
MODULE_AUTHOR("Nicolas Thill <nico@openwrt.org>");
|
|
MODULE_DESCRIPTION(LONGNAME);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static int ar7_gpio_major;
|
|
|
|
static ssize_t ar7_gpio_write(struct file *file, const char __user *buf,
|
|
size_t len, loff_t *ppos)
|
|
{
|
|
int pin = iminor(file->f_dentry->d_inode);
|
|
size_t i;
|
|
|
|
for (i = 0; i < len; ++i) {
|
|
char c;
|
|
if (get_user(c, buf + i))
|
|
return -EFAULT;
|
|
switch (c) {
|
|
case '0':
|
|
gpio_set_value(pin, 0);
|
|
break;
|
|
case '1':
|
|
gpio_set_value(pin, 1);
|
|
break;
|
|
case 'd':
|
|
case 'D':
|
|
ar7_gpio_disable(pin);
|
|
break;
|
|
case 'e':
|
|
case 'E':
|
|
ar7_gpio_enable(pin);
|
|
break;
|
|
case 'i':
|
|
case 'I':
|
|
case '<':
|
|
gpio_direction_input(pin);
|
|
break;
|
|
case 'o':
|
|
case 'O':
|
|
case '>':
|
|
gpio_direction_output(pin, 0);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
static ssize_t ar7_gpio_read(struct file *file, char __user *buf,
|
|
size_t len, loff_t *ppos)
|
|
{
|
|
int pin = iminor(file->f_dentry->d_inode);
|
|
int value;
|
|
|
|
value = gpio_get_value(pin);
|
|
if (put_user(value ? '1' : '0', buf))
|
|
return -EFAULT;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int ar7_gpio_open(struct inode *inode, struct file *file)
|
|
{
|
|
int m = iminor(inode);
|
|
|
|
if (m >= AR7_GPIO_MAX)
|
|
return -EINVAL;
|
|
|
|
return nonseekable_open(inode, file);
|
|
}
|
|
|
|
static int ar7_gpio_release(struct inode *inode, struct file *file)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations ar7_gpio_fops = {
|
|
.owner = THIS_MODULE,
|
|
.write = ar7_gpio_write,
|
|
.read = ar7_gpio_read,
|
|
.open = ar7_gpio_open,
|
|
.release = ar7_gpio_release,
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
static struct platform_device *ar7_gpio_device;
|
|
|
|
static int __init ar7_gpio_init(void)
|
|
{
|
|
int rc;
|
|
|
|
ar7_gpio_device = platform_device_alloc(DRVNAME, -1);
|
|
if (!ar7_gpio_device)
|
|
return -ENOMEM;
|
|
|
|
rc = platform_device_add(ar7_gpio_device);
|
|
if (rc < 0)
|
|
goto out_put;
|
|
|
|
rc = register_chrdev(ar7_gpio_major, DRVNAME, &ar7_gpio_fops);
|
|
if (rc < 0)
|
|
goto out_put;
|
|
|
|
ar7_gpio_major = rc;
|
|
|
|
rc = 0;
|
|
|
|
goto out;
|
|
|
|
out_put:
|
|
platform_device_put(ar7_gpio_device);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static void __exit ar7_gpio_exit(void)
|
|
{
|
|
unregister_chrdev(ar7_gpio_major, DRVNAME);
|
|
platform_device_unregister(ar7_gpio_device);
|
|
}
|
|
|
|
module_init(ar7_gpio_init);
|
|
module_exit(ar7_gpio_exit);
|