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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);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * EISA "eeprom" support routines
4 *
5 * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
6 */
7
8#include <linux/module.h>
9#include <linux/init.h>
10#include <linux/kernel.h>
11#include <linux/miscdevice.h>
12#include <linux/slab.h>
13#include <linux/fs.h>
14#include <asm/io.h>
15#include <linux/uaccess.h>
16#include <asm/eisa_eeprom.h>
17
18#define EISA_EEPROM_MINOR 241
19
20static loff_t eisa_eeprom_llseek(struct file *file, loff_t offset, int origin)
21{
22 return fixed_size_llseek(file, offset, origin, HPEE_MAX_LENGTH);
23}
24
25static ssize_t eisa_eeprom_read(struct file * file,
26 char __user *buf, size_t count, loff_t *ppos )
27{
28 unsigned char *tmp;
29 ssize_t ret;
30 int i;
31
32 if (*ppos < 0 || *ppos >= HPEE_MAX_LENGTH)
33 return 0;
34
35 count = *ppos + count < HPEE_MAX_LENGTH ? count : HPEE_MAX_LENGTH - *ppos;
36 tmp = kmalloc(count, GFP_KERNEL);
37 if (tmp) {
38 for (i = 0; i < count; i++)
39 tmp[i] = readb(eisa_eeprom_addr+(*ppos)++);
40
41 if (copy_to_user (buf, tmp, count))
42 ret = -EFAULT;
43 else
44 ret = count;
45 kfree (tmp);
46 } else
47 ret = -ENOMEM;
48
49 return ret;
50}
51
52static int eisa_eeprom_open(struct inode *inode, struct file *file)
53{
54 if (file->f_mode & FMODE_WRITE)
55 return -EINVAL;
56
57 return 0;
58}
59
60static int eisa_eeprom_release(struct inode *inode, struct file *file)
61{
62 return 0;
63}
64
65/*
66 * The various file operations we support.
67 */
68static const struct file_operations eisa_eeprom_fops = {
69 .owner = THIS_MODULE,
70 .llseek = eisa_eeprom_llseek,
71 .read = eisa_eeprom_read,
72 .open = eisa_eeprom_open,
73 .release = eisa_eeprom_release,
74};
75
76static struct miscdevice eisa_eeprom_dev = {
77 EISA_EEPROM_MINOR,
78 "eisa_eeprom",
79 &eisa_eeprom_fops
80};
81
82static int __init eisa_eeprom_init(void)
83{
84 int retval;
85
86 if (!eisa_eeprom_addr)
87 return -ENODEV;
88
89 retval = misc_register(&eisa_eeprom_dev);
90 if (retval < 0) {
91 printk(KERN_ERR "EISA EEPROM: cannot register misc device.\n");
92 return retval;
93 }
94
95 printk(KERN_INFO "EISA EEPROM at 0x%px\n", eisa_eeprom_addr);
96 return 0;
97}
98
99MODULE_LICENSE("GPL");
100
101module_init(eisa_eeprom_init);