Commit | Line | Data |
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1da177e4 LT |
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 | ||
34 | static 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 | ||
50 | static ssize_t eisa_eeprom_read(struct file * file, | |
45dbe914 | 51 | char __user *buf, size_t count, loff_t *ppos ) |
1da177e4 LT |
52 | { |
53 | unsigned char *tmp; | |
54 | ssize_t ret; | |
55 | int i; | |
56 | ||
6b4dbcd8 | 57 | if (*ppos < 0 || *ppos >= HPEE_MAX_LENGTH) |
1da177e4 LT |
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 | ||
1da177e4 LT |
77 | static int eisa_eeprom_open(struct inode *inode, struct file *file) |
78 | { | |
aeb5d727 | 79 | if (file->f_mode & FMODE_WRITE) |
1da177e4 LT |
80 | return -EINVAL; |
81 | ||
82 | return 0; | |
83 | } | |
84 | ||
85 | static 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 | */ | |
d54b1fdb | 93 | static const struct file_operations eisa_eeprom_fops = { |
1da177e4 LT |
94 | .owner = THIS_MODULE, |
95 | .llseek = eisa_eeprom_llseek, | |
96 | .read = eisa_eeprom_read, | |
1da177e4 LT |
97 | .open = eisa_eeprom_open, |
98 | .release = eisa_eeprom_release, | |
99 | }; | |
100 | ||
101 | static struct miscdevice eisa_eeprom_dev = { | |
102 | EISA_EEPROM_MINOR, | |
103 | "eisa_eeprom", | |
104 | &eisa_eeprom_fops | |
105 | }; | |
106 | ||
107 | static 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 | ||
124 | MODULE_LICENSE("GPL"); | |
125 | ||
126 | module_init(eisa_eeprom_init); |