Commit | Line | Data |
---|---|---|
1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * EISA "eeprom" support routines | |
4 | * | |
5 | * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org> | |
1da177e4 LT |
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> | |
7c0f6ba6 | 15 | #include <linux/uaccess.h> |
1da177e4 LT |
16 | #include <asm/eisa_eeprom.h> |
17 | ||
18 | #define EISA_EEPROM_MINOR 241 | |
19 | ||
74797797 | 20 | static loff_t eisa_eeprom_llseek(struct file *file, loff_t offset, int origin) |
1da177e4 | 21 | { |
74797797 | 22 | return fixed_size_llseek(file, offset, origin, HPEE_MAX_LENGTH); |
1da177e4 LT |
23 | } |
24 | ||
25 | static ssize_t eisa_eeprom_read(struct file * file, | |
45dbe914 | 26 | char __user *buf, size_t count, loff_t *ppos ) |
1da177e4 LT |
27 | { |
28 | unsigned char *tmp; | |
29 | ssize_t ret; | |
30 | int i; | |
31 | ||
6b4dbcd8 | 32 | if (*ppos < 0 || *ppos >= HPEE_MAX_LENGTH) |
1da177e4 LT |
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 | ||
1da177e4 LT |
52 | static int eisa_eeprom_open(struct inode *inode, struct file *file) |
53 | { | |
aeb5d727 | 54 | if (file->f_mode & FMODE_WRITE) |
1da177e4 LT |
55 | return -EINVAL; |
56 | ||
57 | return 0; | |
58 | } | |
59 | ||
60 | static 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 | */ | |
d54b1fdb | 68 | static const struct file_operations eisa_eeprom_fops = { |
1da177e4 LT |
69 | .owner = THIS_MODULE, |
70 | .llseek = eisa_eeprom_llseek, | |
71 | .read = eisa_eeprom_read, | |
1da177e4 LT |
72 | .open = eisa_eeprom_open, |
73 | .release = eisa_eeprom_release, | |
74 | }; | |
75 | ||
76 | static struct miscdevice eisa_eeprom_dev = { | |
77 | EISA_EEPROM_MINOR, | |
78 | "eisa_eeprom", | |
79 | &eisa_eeprom_fops | |
80 | }; | |
81 | ||
82 | static 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 | ||
28df2f83 | 95 | printk(KERN_INFO "EISA EEPROM at 0x%px\n", eisa_eeprom_addr); |
1da177e4 LT |
96 | return 0; |
97 | } | |
98 | ||
99 | MODULE_LICENSE("GPL"); | |
100 | ||
101 | module_init(eisa_eeprom_init); |