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1 | /* |
2 | * /dev/nvram driver for Power Macintosh. |
3 | */ |
4 | |
5 | #define NVRAM_VERSION "1.0" |
6 | |
7 | #include <linux/module.h> |
8 | |
9 | #include <linux/types.h> |
10 | #include <linux/errno.h> |
11 | #include <linux/fs.h> |
12 | #include <linux/miscdevice.h> |
13 | #include <linux/fcntl.h> |
14 | #include <linux/nvram.h> |
15 | #include <linux/init.h> |
16 | #include <asm/uaccess.h> |
17 | #include <asm/nvram.h> |
18 | |
19 | #define NVRAM_SIZE 8192 |
20 | |
21 | static loff_t nvram_llseek(struct file *file, loff_t offset, int origin) |
22 | { |
23 | switch (origin) { |
24 | case 0: |
25 | break; |
26 | case 1: |
27 | offset += file->f_pos; |
28 | break; |
29 | case 2: |
30 | offset += NVRAM_SIZE; |
31 | break; |
32 | default: |
33 | offset = -1; |
34 | } |
35 | if (offset < 0) |
36 | return -EINVAL; |
37 | |
38 | file->f_pos = offset; |
39 | return file->f_pos; |
40 | } |
41 | |
42 | static ssize_t read_nvram(struct file *file, char __user *buf, |
43 | size_t count, loff_t *ppos) |
44 | { |
45 | unsigned int i; |
46 | char __user *p = buf; |
47 | |
48 | if (!access_ok(VERIFY_WRITE, buf, count)) |
49 | return -EFAULT; |
50 | if (*ppos >= NVRAM_SIZE) |
51 | return 0; |
52 | for (i = *ppos; count > 0 && i < NVRAM_SIZE; ++i, ++p, --count) |
53 | if (__put_user(nvram_read_byte(i), p)) |
54 | return -EFAULT; |
55 | *ppos = i; |
56 | return p - buf; |
57 | } |
58 | |
59 | static ssize_t write_nvram(struct file *file, const char __user *buf, |
60 | size_t count, loff_t *ppos) |
61 | { |
62 | unsigned int i; |
63 | const char __user *p = buf; |
64 | char c; |
65 | |
66 | if (!access_ok(VERIFY_READ, buf, count)) |
67 | return -EFAULT; |
68 | if (*ppos >= NVRAM_SIZE) |
69 | return 0; |
70 | for (i = *ppos; count > 0 && i < NVRAM_SIZE; ++i, ++p, --count) { |
71 | if (__get_user(c, p)) |
72 | return -EFAULT; |
73 | nvram_write_byte(c, i); |
74 | } |
75 | *ppos = i; |
76 | return p - buf; |
77 | } |
78 | |
79 | static long nvram_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
80 | { |
81 | switch(cmd) { |
82 | case PMAC_NVRAM_GET_OFFSET: |
83 | { |
84 | int part, offset; |
85 | if (copy_from_user(&part, (void __user*)arg, sizeof(part)) != 0) |
86 | return -EFAULT; |
87 | if (part < pmac_nvram_OF || part > pmac_nvram_NR) |
88 | return -EINVAL; |
89 | offset = pmac_get_partition(part); |
90 | if (copy_to_user((void __user*)arg, &offset, sizeof(offset)) != 0) |
91 | return -EFAULT; |
92 | break; |
93 | } |
94 | |
95 | default: |
96 | return -EINVAL; |
97 | } |
98 | |
99 | return 0; |
100 | } |
101 | |
102 | const struct file_operations nvram_fops = { |
103 | .owner = THIS_MODULE, |
104 | .llseek = nvram_llseek, |
105 | .read = read_nvram, |
106 | .write = write_nvram, |
107 | .unlocked_ioctl = nvram_ioctl, |
108 | }; |
109 | |
110 | static struct miscdevice nvram_dev = { |
111 | NVRAM_MINOR, |
112 | "nvram", |
113 | &nvram_fops |
114 | }; |
115 | |
116 | int __init nvram_init(void) |
117 | { |
118 | printk(KERN_INFO "Macintosh non-volatile memory driver v%s\n", |
119 | NVRAM_VERSION); |
120 | return misc_register(&nvram_dev); |
121 | } |
122 | |
123 | void __exit nvram_cleanup(void) |
124 | { |
125 | misc_deregister( &nvram_dev ); |
126 | } |
127 | |
128 | module_init(nvram_init); |
129 | module_exit(nvram_cleanup); |
130 | MODULE_LICENSE("GPL"); |
131 |
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