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/smp_lock.h>
28 #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
35 static 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
51 static ssize_t eisa_eeprom_read(struct file * file,
52 char __user *buf, size_t count, loff_t *ppos )
53 {
54 unsigned char *tmp;
55 ssize_t ret;
56 int i;
57
58 if (*ppos < 0 || *ppos >= HPEE_MAX_LENGTH)
59 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
78 static int eisa_eeprom_ioctl(struct inode *inode, struct file *file,
79 unsigned int cmd,
80 unsigned long arg)
81 {
82 return -ENOTTY;
83 }
84
85 static int eisa_eeprom_open(struct inode *inode, struct file *file)
86 {
87 cycle_kernel_lock();
88
89 if (file->f_mode & FMODE_WRITE)
90 return -EINVAL;
91
92 return 0;
93 }
94
95 static int eisa_eeprom_release(struct inode *inode, struct file *file)
96 {
97 return 0;
98 }
99
100 /*
101 * The various file operations we support.
102 */
103 static const struct file_operations eisa_eeprom_fops = {
104 .owner = THIS_MODULE,
105 .llseek = eisa_eeprom_llseek,
106 .read = eisa_eeprom_read,
107 .ioctl = eisa_eeprom_ioctl,
108 .open = eisa_eeprom_open,
109 .release = eisa_eeprom_release,
110 };
111
112 static struct miscdevice eisa_eeprom_dev = {
113 EISA_EEPROM_MINOR,
114 "eisa_eeprom",
115 &eisa_eeprom_fops
116 };
117
118 static int __init eisa_eeprom_init(void)
119 {
120 int retval;
121
122 if (!eisa_eeprom_addr)
123 return -ENODEV;
124
125 retval = misc_register(&eisa_eeprom_dev);
126 if (retval < 0) {
127 printk(KERN_ERR "EISA EEPROM: cannot register misc device.\n");
128 return retval;
129 }
130
131 printk(KERN_INFO "EISA EEPROM at 0x%p\n", eisa_eeprom_addr);
132 return 0;
133 }
134
135 MODULE_LICENSE("GPL");
136
137 module_init(eisa_eeprom_init);
138
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