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 >= 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_ioctl(struct inode *inode, struct file *file,
78			   unsigned int cmd,
79			   unsigned long arg)
80{
81	return -ENOTTY;
82}
83
84static int eisa_eeprom_open(struct inode *inode, struct file *file)
85{
86	if (file->f_mode & 2)
87		return -EINVAL;
88
89	return 0;
90}
91
92static int eisa_eeprom_release(struct inode *inode, struct file *file)
93{
94	return 0;
95}
96
97/*
98 *	The various file operations we support.
99 */
100static const struct file_operations eisa_eeprom_fops = {
101	.owner =	THIS_MODULE,
102	.llseek =	eisa_eeprom_llseek,
103	.read =		eisa_eeprom_read,
104	.ioctl =	eisa_eeprom_ioctl,
105	.open =		eisa_eeprom_open,
106	.release =	eisa_eeprom_release,
107};
108
109static struct miscdevice eisa_eeprom_dev = {
110	EISA_EEPROM_MINOR,
111	"eisa_eeprom",
112	&eisa_eeprom_fops
113};
114
115static int __init eisa_eeprom_init(void)
116{
117	int retval;
118
119	if (!eisa_eeprom_addr)
120		return -ENODEV;
121
122	retval = misc_register(&eisa_eeprom_dev);
123	if (retval < 0) {
124		printk(KERN_ERR "EISA EEPROM: cannot register misc device.\n");
125		return retval;
126	}
127
128	printk(KERN_INFO "EISA EEPROM at 0x%p\n", eisa_eeprom_addr);
129	return 0;
130}
131
132MODULE_LICENSE("GPL");
133
134module_init(eisa_eeprom_init);
135