mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-14 23:47:10 +02:00
796a9d1091
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@15242 3c298f89-4303-0410-b956-a3cf2f4a3e73
158 lines
3.0 KiB
C
158 lines
3.0 KiB
C
/*
|
|
* GPIO char driver
|
|
*
|
|
* Copyright 2005, Broadcom Corporation
|
|
* All Rights Reserved.
|
|
*
|
|
* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
|
|
* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
|
|
* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
|
|
* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/miscdevice.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
#include <typedefs.h>
|
|
#include <osl.h>
|
|
#include <sbutils.h>
|
|
#include <bcmdevs.h>
|
|
|
|
static sb_t *gpio_sbh;
|
|
static int gpio_major;
|
|
static devfs_handle_t gpio_dir;
|
|
static struct {
|
|
char *name;
|
|
devfs_handle_t handle;
|
|
} gpio_file[] = {
|
|
{ "in", NULL },
|
|
{ "out", NULL },
|
|
{ "outen", NULL },
|
|
{ "control", NULL }
|
|
};
|
|
|
|
static int
|
|
gpio_open(struct inode *inode, struct file * file)
|
|
{
|
|
if (MINOR(inode->i_rdev) > ARRAYSIZE(gpio_file))
|
|
return -ENODEV;
|
|
|
|
MOD_INC_USE_COUNT;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
gpio_release(struct inode *inode, struct file * file)
|
|
{
|
|
MOD_DEC_USE_COUNT;
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t
|
|
gpio_read(struct file *file, char *buf, size_t count, loff_t *ppos)
|
|
{
|
|
u32 val;
|
|
|
|
switch (MINOR(file->f_dentry->d_inode->i_rdev)) {
|
|
case 0:
|
|
val = sb_gpioin(gpio_sbh);
|
|
break;
|
|
case 1:
|
|
val = sb_gpioout(gpio_sbh, 0, 0, GPIO_DRV_PRIORITY);
|
|
break;
|
|
case 2:
|
|
val = sb_gpioouten(gpio_sbh, 0, 0, GPIO_DRV_PRIORITY);
|
|
break;
|
|
case 3:
|
|
val = sb_gpiocontrol(gpio_sbh, 0, 0, GPIO_DRV_PRIORITY);
|
|
break;
|
|
default:
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (put_user(val, (u32 *) buf))
|
|
return -EFAULT;
|
|
|
|
return sizeof(val);
|
|
}
|
|
|
|
static ssize_t
|
|
gpio_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
|
|
{
|
|
u32 val;
|
|
|
|
if (get_user(val, (u32 *) buf))
|
|
return -EFAULT;
|
|
|
|
switch (MINOR(file->f_dentry->d_inode->i_rdev)) {
|
|
case 0:
|
|
return -EACCES;
|
|
case 1:
|
|
sb_gpioout(gpio_sbh, ~0, val, GPIO_DRV_PRIORITY);
|
|
break;
|
|
case 2:
|
|
sb_gpioouten(gpio_sbh, ~0, val, GPIO_DRV_PRIORITY);
|
|
break;
|
|
case 3:
|
|
sb_gpiocontrol(gpio_sbh, ~0, val, GPIO_DRV_PRIORITY);
|
|
break;
|
|
default:
|
|
return -ENODEV;
|
|
}
|
|
|
|
return sizeof(val);
|
|
}
|
|
|
|
static struct file_operations gpio_fops = {
|
|
owner: THIS_MODULE,
|
|
open: gpio_open,
|
|
release: gpio_release,
|
|
read: gpio_read,
|
|
write: gpio_write,
|
|
};
|
|
|
|
static int __init
|
|
gpio_init(void)
|
|
{
|
|
int i;
|
|
|
|
if (!(gpio_sbh = sb_kattach(SB_OSH)))
|
|
return -ENODEV;
|
|
|
|
sb_gpiosetcore(gpio_sbh);
|
|
|
|
if ((gpio_major = devfs_register_chrdev(0, "gpio", &gpio_fops)) < 0)
|
|
return gpio_major;
|
|
|
|
gpio_dir = devfs_mk_dir(NULL, "gpio", NULL);
|
|
|
|
for (i = 0; i < ARRAYSIZE(gpio_file); i++) {
|
|
gpio_file[i].handle = devfs_register(gpio_dir,
|
|
gpio_file[i].name,
|
|
DEVFS_FL_DEFAULT, gpio_major, i,
|
|
S_IFCHR | S_IRUGO | S_IWUGO,
|
|
&gpio_fops, NULL);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit
|
|
gpio_exit(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAYSIZE(gpio_file); i++)
|
|
devfs_unregister(gpio_file[i].handle);
|
|
devfs_unregister(gpio_dir);
|
|
devfs_unregister_chrdev(gpio_major, "gpio");
|
|
sb_detach(gpio_sbh);
|
|
}
|
|
|
|
module_init(gpio_init);
|
|
module_exit(gpio_exit);
|