mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 14:40:53 +07:00
138 lines
3.1 KiB
C
138 lines
3.1 KiB
C
/*
|
|
* EISA "eeprom" support routines
|
|
*
|
|
* Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/miscdevice.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/fs.h>
|
|
#include <asm/io.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/eisa_eeprom.h>
|
|
|
|
#define EISA_EEPROM_MINOR 241
|
|
|
|
static loff_t eisa_eeprom_llseek(struct file *file, loff_t offset, int origin )
|
|
{
|
|
switch (origin) {
|
|
case 0:
|
|
/* nothing to do */
|
|
break;
|
|
case 1:
|
|
offset += file->f_pos;
|
|
break;
|
|
case 2:
|
|
offset += HPEE_MAX_LENGTH;
|
|
break;
|
|
}
|
|
return (offset >= 0 && offset < HPEE_MAX_LENGTH) ? (file->f_pos = offset) : -EINVAL;
|
|
}
|
|
|
|
static ssize_t eisa_eeprom_read(struct file * file,
|
|
char __user *buf, size_t count, loff_t *ppos )
|
|
{
|
|
unsigned char *tmp;
|
|
ssize_t ret;
|
|
int i;
|
|
|
|
if (*ppos >= HPEE_MAX_LENGTH)
|
|
return 0;
|
|
|
|
count = *ppos + count < HPEE_MAX_LENGTH ? count : HPEE_MAX_LENGTH - *ppos;
|
|
tmp = kmalloc(count, GFP_KERNEL);
|
|
if (tmp) {
|
|
for (i = 0; i < count; i++)
|
|
tmp[i] = readb(eisa_eeprom_addr+(*ppos)++);
|
|
|
|
if (copy_to_user (buf, tmp, count))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = count;
|
|
kfree (tmp);
|
|
} else
|
|
ret = -ENOMEM;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int eisa_eeprom_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
return -ENOTTY;
|
|
}
|
|
|
|
static int eisa_eeprom_open(struct inode *inode, struct file *file)
|
|
{
|
|
cycle_kernel_lock();
|
|
|
|
if (file->f_mode & 2)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int eisa_eeprom_release(struct inode *inode, struct file *file)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The various file operations we support.
|
|
*/
|
|
static const struct file_operations eisa_eeprom_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = eisa_eeprom_llseek,
|
|
.read = eisa_eeprom_read,
|
|
.ioctl = eisa_eeprom_ioctl,
|
|
.open = eisa_eeprom_open,
|
|
.release = eisa_eeprom_release,
|
|
};
|
|
|
|
static struct miscdevice eisa_eeprom_dev = {
|
|
EISA_EEPROM_MINOR,
|
|
"eisa_eeprom",
|
|
&eisa_eeprom_fops
|
|
};
|
|
|
|
static int __init eisa_eeprom_init(void)
|
|
{
|
|
int retval;
|
|
|
|
if (!eisa_eeprom_addr)
|
|
return -ENODEV;
|
|
|
|
retval = misc_register(&eisa_eeprom_dev);
|
|
if (retval < 0) {
|
|
printk(KERN_ERR "EISA EEPROM: cannot register misc device.\n");
|
|
return retval;
|
|
}
|
|
|
|
printk(KERN_INFO "EISA EEPROM at 0x%p\n", eisa_eeprom_addr);
|
|
return 0;
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(eisa_eeprom_init);
|