blob: 783906fe659a2824987fe4b5cc9397c866ba91f7 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * EISA "eeprom" support routines
3 *
4 * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22#include <linux/module.h>
23#include <linux/init.h>
24#include <linux/kernel.h>
25#include <linux/miscdevice.h>
26#include <linux/slab.h>
27#include <linux/fs.h>
28#include <asm/io.h>
29#include <asm/uaccess.h>
30#include <asm/eisa_eeprom.h>
31
32#define EISA_EEPROM_MINOR 241
33
Al Viro74797792013-06-17 15:27:47 +040034static loff_t eisa_eeprom_llseek(struct file *file, loff_t offset, int origin)
Linus Torvalds1da177e2005-04-16 15:20:36 -070035{
Al Viro74797792013-06-17 15:27:47 +040036 return fixed_size_llseek(file, offset, origin, HPEE_MAX_LENGTH);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037}
38
39static ssize_t eisa_eeprom_read(struct file * file,
Alexey Dobriyan45dbe912006-01-10 20:47:51 -050040 char __user *buf, size_t count, loff_t *ppos )
Linus Torvalds1da177e2005-04-16 15:20:36 -070041{
42 unsigned char *tmp;
43 ssize_t ret;
44 int i;
45
Michael Buesch6b4dbcd2009-07-20 22:58:44 +000046 if (*ppos < 0 || *ppos >= HPEE_MAX_LENGTH)
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 return 0;
48
49 count = *ppos + count < HPEE_MAX_LENGTH ? count : HPEE_MAX_LENGTH - *ppos;
50 tmp = kmalloc(count, GFP_KERNEL);
51 if (tmp) {
52 for (i = 0; i < count; i++)
53 tmp[i] = readb(eisa_eeprom_addr+(*ppos)++);
54
55 if (copy_to_user (buf, tmp, count))
56 ret = -EFAULT;
57 else
58 ret = count;
59 kfree (tmp);
60 } else
61 ret = -ENOMEM;
62
63 return ret;
64}
65
Linus Torvalds1da177e2005-04-16 15:20:36 -070066static int eisa_eeprom_open(struct inode *inode, struct file *file)
67{
Al Viroaeb5d722008-09-02 15:28:45 -040068 if (file->f_mode & FMODE_WRITE)
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 return -EINVAL;
70
71 return 0;
72}
73
74static int eisa_eeprom_release(struct inode *inode, struct file *file)
75{
76 return 0;
77}
78
79/*
80 * The various file operations we support.
81 */
Arjan van de Vend54b1fd2007-02-12 00:55:34 -080082static const struct file_operations eisa_eeprom_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 .owner = THIS_MODULE,
84 .llseek = eisa_eeprom_llseek,
85 .read = eisa_eeprom_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 .open = eisa_eeprom_open,
87 .release = eisa_eeprom_release,
88};
89
90static struct miscdevice eisa_eeprom_dev = {
91 EISA_EEPROM_MINOR,
92 "eisa_eeprom",
93 &eisa_eeprom_fops
94};
95
96static int __init eisa_eeprom_init(void)
97{
98 int retval;
99
100 if (!eisa_eeprom_addr)
101 return -ENODEV;
102
103 retval = misc_register(&eisa_eeprom_dev);
104 if (retval < 0) {
105 printk(KERN_ERR "EISA EEPROM: cannot register misc device.\n");
106 return retval;
107 }
108
109 printk(KERN_INFO "EISA EEPROM at 0x%p\n", eisa_eeprom_addr);
110 return 0;
111}
112
113MODULE_LICENSE("GPL");
114
115module_init(eisa_eeprom_init);