1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/*
* Linux/PowerPC Real Time Clock Driver
*
* heavily based on:
* Linux/SPARC Real Time Clock Driver
* Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
*
* This is a little driver that lets a user-level program access
* the PPC clocks chip. It is no use unless you
* use the modified clock utility.
*
* Get the modified clock utility from:
* ftp://vger.rutgers.edu/pub/linux/Sparc/userland/clock.c
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/miscdevice.h>
#include <linux/slab.h>
#include <linux/fcntl.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/mc146818rtc.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/machdep.h>
#include <asm/time.h>
static int rtc_busy = 0;
/* Retrieve the current date and time from the real time clock. */
void get_rtc_time(struct rtc_time *t)
{
unsigned long nowtime;
nowtime = (ppc_md.get_rtc_time)();
to_tm(nowtime, t);
t->tm_year -= 1900;
t->tm_mon -= 1;
t->tm_wday -= 1;
}
/* Set the current date and time in the real time clock. */
void set_rtc_time(struct rtc_time *t)
{
unsigned long nowtime;
printk(KERN_INFO "rtc.c:set_rtc_time: %04d-%02d-%02d %02d:%02d:%02d.\n", t->tm_year+1900, t->tm_mon+1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec);
nowtime = mktime(t->tm_year+1900, t->tm_mon+1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec);
printk(KERN_INFO "rtc.c:set_rtc_time: set rtc time to %ld seconds.\n", nowtime);
(ppc_md.set_rtc_time)(nowtime);
}
static loff_t rtc_lseek(struct file *file, loff_t offset, int origin)
{
return -ESPIPE;
}
static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
{
struct rtc_time rtc_tm;
switch (cmd)
{
case RTC_RD_TIME:
if (ppc_md.get_rtc_time)
{
get_rtc_time(&rtc_tm);
if (copy_to_user((struct rtc_time*)arg, &rtc_tm, sizeof(struct rtc_time)))
return -EFAULT;
return 0;
}
else
return -EINVAL;
case RTC_SET_TIME:
if (!capable(CAP_SYS_TIME))
return -EPERM;
if (ppc_md.set_rtc_time)
{
if (copy_from_user(&rtc_tm, (struct rtc_time*)arg, sizeof(struct rtc_time)))
return -EFAULT;
set_rtc_time(&rtc_tm);
return 0;
}
else
return -EINVAL;
default:
return -EINVAL;
}
}
static int rtc_open(struct inode *inode, struct file *file)
{
if (rtc_busy)
return -EBUSY;
rtc_busy = 1;
MOD_INC_USE_COUNT;
return 0;
}
static int rtc_release(struct inode *inode, struct file *file)
{
MOD_DEC_USE_COUNT;
rtc_busy = 0;
return 0;
}
static struct file_operations rtc_fops = {
owner: THIS_MODULE,
llseek: rtc_lseek,
ioctl: rtc_ioctl,
open: rtc_open,
release: rtc_release
};
static struct miscdevice rtc_dev = { RTC_MINOR, "rtc", &rtc_fops };
EXPORT_NO_SYMBOLS;
static int __init rtc_init(void)
{
int error;
error = misc_register(&rtc_dev);
if (error) {
printk(KERN_ERR "rtc: unable to get misc minor\n");
return error;
}
return 0;
}
static void __exit rtc_exit(void)
{
misc_deregister(&rtc_dev);
}
module_init(rtc_init);
module_exit(rtc_exit);
|
