Root/drivers/parisc/eisa_eeprom.c

1/*
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
34static loff_t eisa_eeprom_llseek(struct file *file, loff_t offset, int origin )
35{
36    switch (origin) {
37      case 0:
38        /* nothing to do */
39        break;
40      case 1:
41        offset += file->f_pos;
42        break;
43      case 2:
44        offset += HPEE_MAX_LENGTH;
45        break;
46    }
47    return (offset >= 0 && offset < HPEE_MAX_LENGTH) ? (file->f_pos = offset) : -EINVAL;
48}
49
50static ssize_t eisa_eeprom_read(struct file * file,
51                  char __user *buf, size_t count, loff_t *ppos )
52{
53    unsigned char *tmp;
54    ssize_t ret;
55    int i;
56    
57    if (*ppos < 0 || *ppos >= HPEE_MAX_LENGTH)
58        return 0;
59    
60    count = *ppos + count < HPEE_MAX_LENGTH ? count : HPEE_MAX_LENGTH - *ppos;
61    tmp = kmalloc(count, GFP_KERNEL);
62    if (tmp) {
63        for (i = 0; i < count; i++)
64            tmp[i] = readb(eisa_eeprom_addr+(*ppos)++);
65
66        if (copy_to_user (buf, tmp, count))
67            ret = -EFAULT;
68        else
69            ret = count;
70        kfree (tmp);
71    } else
72        ret = -ENOMEM;
73    
74    return ret;
75}
76
77static int eisa_eeprom_open(struct inode *inode, struct file *file)
78{
79    if (file->f_mode & FMODE_WRITE)
80        return -EINVAL;
81   
82    return 0;
83}
84
85static int eisa_eeprom_release(struct inode *inode, struct file *file)
86{
87    return 0;
88}
89
90/*
91 * The various file operations we support.
92 */
93static const struct file_operations eisa_eeprom_fops = {
94    .owner = THIS_MODULE,
95    .llseek = eisa_eeprom_llseek,
96    .read = eisa_eeprom_read,
97    .open = eisa_eeprom_open,
98    .release = eisa_eeprom_release,
99};
100
101static struct miscdevice eisa_eeprom_dev = {
102    EISA_EEPROM_MINOR,
103    "eisa_eeprom",
104    &eisa_eeprom_fops
105};
106
107static int __init eisa_eeprom_init(void)
108{
109    int retval;
110
111    if (!eisa_eeprom_addr)
112        return -ENODEV;
113
114    retval = misc_register(&eisa_eeprom_dev);
115    if (retval < 0) {
116        printk(KERN_ERR "EISA EEPROM: cannot register misc device.\n");
117        return retval;
118    }
119
120    printk(KERN_INFO "EISA EEPROM at 0x%p\n", eisa_eeprom_addr);
121    return 0;
122}
123
124MODULE_LICENSE("GPL");
125
126module_init(eisa_eeprom_init);
127

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