[go: nahoru, domu]
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	return fixed_size_llseek(file, offset, origin, HPEE_MAX_LENGTH);
37}
38
39static ssize_t eisa_eeprom_read(struct file * file,
40			      char __user *buf, size_t count, loff_t *ppos )
41{
42	unsigned char *tmp;
43	ssize_t ret;
44	int i;
45
46	if (*ppos < 0 || *ppos >= HPEE_MAX_LENGTH)
47		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
66static int eisa_eeprom_open(struct inode *inode, struct file *file)
67{
68	if (file->f_mode & FMODE_WRITE)
69		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 */
82static const struct file_operations eisa_eeprom_fops = {
83	.owner =	THIS_MODULE,
84	.llseek =	eisa_eeprom_llseek,
85	.read =		eisa_eeprom_read,
86	.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);
116