blob: cce00ed81f37908fd062d34a89ad3f8f49a5d4e3 [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>
Arnd Bergmann6044c312008-05-20 19:16:30 +020027#include <linux/smp_lock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/fs.h>
29#include <asm/io.h>
30#include <asm/uaccess.h>
31#include <asm/eisa_eeprom.h>
32
33#define EISA_EEPROM_MINOR 241
34
35static loff_t eisa_eeprom_llseek(struct file *file, loff_t offset, int origin )
36{
37 switch (origin) {
38 case 0:
39 /* nothing to do */
40 break;
41 case 1:
42 offset += file->f_pos;
43 break;
44 case 2:
45 offset += HPEE_MAX_LENGTH;
46 break;
47 }
48 return (offset >= 0 && offset < HPEE_MAX_LENGTH) ? (file->f_pos = offset) : -EINVAL;
49}
50
51static ssize_t eisa_eeprom_read(struct file * file,
Alexey Dobriyan45dbe912006-01-10 20:47:51 -050052 char __user *buf, size_t count, loff_t *ppos )
Linus Torvalds1da177e2005-04-16 15:20:36 -070053{
54 unsigned char *tmp;
55 ssize_t ret;
56 int i;
57
Michael Buesch6b4dbcd2009-07-20 22:58:44 +000058 if (*ppos < 0 || *ppos >= HPEE_MAX_LENGTH)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 return 0;
60
61 count = *ppos + count < HPEE_MAX_LENGTH ? count : HPEE_MAX_LENGTH - *ppos;
62 tmp = kmalloc(count, GFP_KERNEL);
63 if (tmp) {
64 for (i = 0; i < count; i++)
65 tmp[i] = readb(eisa_eeprom_addr+(*ppos)++);
66
67 if (copy_to_user (buf, tmp, count))
68 ret = -EFAULT;
69 else
70 ret = count;
71 kfree (tmp);
72 } else
73 ret = -ENOMEM;
74
75 return ret;
76}
77
Linus Torvalds1da177e2005-04-16 15:20:36 -070078static int eisa_eeprom_open(struct inode *inode, struct file *file)
79{
Al Viroaeb5d722008-09-02 15:28:45 -040080 if (file->f_mode & FMODE_WRITE)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 return -EINVAL;
82
83 return 0;
84}
85
86static int eisa_eeprom_release(struct inode *inode, struct file *file)
87{
88 return 0;
89}
90
91/*
92 * The various file operations we support.
93 */
Arjan van de Vend54b1fd2007-02-12 00:55:34 -080094static const struct file_operations eisa_eeprom_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 .owner = THIS_MODULE,
96 .llseek = eisa_eeprom_llseek,
97 .read = eisa_eeprom_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 .open = eisa_eeprom_open,
99 .release = eisa_eeprom_release,
100};
101
102static struct miscdevice eisa_eeprom_dev = {
103 EISA_EEPROM_MINOR,
104 "eisa_eeprom",
105 &eisa_eeprom_fops
106};
107
108static int __init eisa_eeprom_init(void)
109{
110 int retval;
111
112 if (!eisa_eeprom_addr)
113 return -ENODEV;
114
115 retval = misc_register(&eisa_eeprom_dev);
116 if (retval < 0) {
117 printk(KERN_ERR "EISA EEPROM: cannot register misc device.\n");
118 return retval;
119 }
120
121 printk(KERN_INFO "EISA EEPROM at 0x%p\n", eisa_eeprom_addr);
122 return 0;
123}
124
125MODULE_LICENSE("GPL");
126
127module_init(eisa_eeprom_init);