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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
diff -r -u linux/drivers/char/Makefile linux-2.4.16/drivers/char/Makefile
--- linux/drivers/char/Makefile Mon Nov 26 14:39:20 2001
+++ linux-2.4.16/drivers/char/Makefile Mon Nov 26 14:40:36 2001
@@ -23,7 +23,7 @@
export-objs := busmouse.o console.o keyboard.o sysrq.o \
misc.o pty.o random.o selection.o serial.o \
- sonypi.o tty_io.o tty_ioctl.o generic_serial.o
+ sonypi.o tty_io.o tty_ioctl.o generic_serial.o rtc.o
mod-subdirs := joystick ftape drm pcmcia
diff -r -u linux/drivers/char/rtc.c linux-2.4.16/drivers/char/rtc.c
--- linux/drivers/char/rtc.c Mon Nov 26 14:39:31 2001
+++ linux-2.4.16/drivers/char/rtc.c Mon Nov 26 14:40:09 2001
@@ -139,6 +139,11 @@
static unsigned long rtc_freq = 0; /* Current periodic IRQ rate */
static unsigned long rtc_irq_data = 0; /* our output to the world */
+#if RTC_IRQ
+static spinlock_t rtc_task_lock = SPIN_LOCK_UNLOCKED;
+static rtc_task_t *rtc_callback = NULL;
+#endif
+
/*
* If this driver ever becomes modularised, it will be really nice
* to make the epoch retain its value across module reload...
@@ -180,6 +185,10 @@
spin_unlock (&rtc_lock);
/* Now do the rest of the actions */
+ spin_lock(&rtc_task_lock);
+ if (rtc_callback)
+ rtc_callback->func(rtc_callback->private_data);
+ spin_unlock(&rtc_task_lock);
wake_up_interruptible(&rtc_wait);
kill_fasync (&rtc_async_queue, SIGIO, POLL_IN);
@@ -244,8 +253,7 @@
#endif
}
-static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
- unsigned long arg)
+static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel)
{
struct rtc_time wtime;
@@ -295,7 +303,7 @@
* We don't really want Joe User enabling more
* than 64Hz of interrupts on a multi-user machine.
*/
- if ((rtc_freq > 64) && (!capable(CAP_SYS_RESOURCE)))
+ if (!kernel && (rtc_freq > 64) && (!capable(CAP_SYS_RESOURCE)))
return -EACCES;
if (!(rtc_status & RTC_TIMER_ON)) {
@@ -493,7 +501,7 @@
* We don't really want Joe User generating more
* than 64Hz of interrupts on a multi-user machine.
*/
- if ((arg > 64) && (!capable(CAP_SYS_RESOURCE)))
+ if (!kernel && (arg > 64) && (!capable(CAP_SYS_RESOURCE)))
return -EACCES;
while (arg > (1<<tmp))
@@ -539,6 +547,12 @@
return copy_to_user((void *)arg, &wtime, sizeof wtime) ? -EFAULT : 0;
}
+static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ return rtc_do_ioctl(cmd, arg, 0);
+}
+
/*
* We enforce only one user at a time here with the open/close.
* Also clear the previous interrupt data on an open, and clean
@@ -606,11 +620,8 @@
spin_lock_irq (&rtc_lock);
rtc_irq_data = 0;
- spin_unlock_irq (&rtc_lock);
-
- /* No need for locking -- nobody else can do anything until this rmw is
- * committed, and no timer is running. */
rtc_status &= ~RTC_IS_OPEN;
+ spin_unlock_irq (&rtc_lock);
return 0;
}
@@ -636,6 +647,88 @@
#endif
/*
+ * exported stuffs
+ */
+
+EXPORT_SYMBOL(rtc_register);
+EXPORT_SYMBOL(rtc_unregister);
+EXPORT_SYMBOL(rtc_control);
+
+int rtc_register(rtc_task_t *task)
+{
+#if !RTC_IRQ
+ return -EIO;
+#else
+ if (task == NULL || task->func == NULL)
+ return -EINVAL;
+ spin_lock_irq(&rtc_lock);
+ if (rtc_status & RTC_IS_OPEN) {
+ spin_unlock_irq(&rtc_lock);
+ return -EBUSY;
+ }
+ spin_lock(&rtc_task_lock);
+ if (rtc_callback) {
+ spin_unlock(&rtc_task_lock);
+ spin_unlock_irq(&rtc_lock);
+ return -EBUSY;
+ }
+ rtc_status |= RTC_IS_OPEN;
+ rtc_callback = task;
+ spin_unlock(&rtc_task_lock);
+ spin_unlock_irq(&rtc_lock);
+ return 0;
+#endif
+}
+
+int rtc_unregister(rtc_task_t *task)
+{
+#if !RTC_IRQ
+ return -EIO;
+#else
+ unsigned char tmp;
+
+ spin_lock_irq(&rtc_task_lock);
+ if (rtc_callback != task) {
+ spin_unlock_irq(&rtc_task_lock);
+ return -ENXIO;
+ }
+ rtc_callback = NULL;
+ spin_lock(&rtc_lock);
+ /* disable controls */
+ tmp = CMOS_READ(RTC_CONTROL);
+ tmp &= ~RTC_PIE;
+ tmp &= ~RTC_AIE;
+ tmp &= ~RTC_UIE;
+ CMOS_WRITE(tmp, RTC_CONTROL);
+ CMOS_READ(RTC_INTR_FLAGS);
+ if (rtc_status & RTC_TIMER_ON) {
+ rtc_status &= ~RTC_TIMER_ON;
+ del_timer(&rtc_irq_timer);
+ }
+ rtc_status &= ~RTC_IS_OPEN;
+ spin_unlock(&rtc_lock);
+ spin_unlock_irq(&rtc_task_lock);
+ return 0;
+#endif
+}
+
+int rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg)
+{
+#if !RTC_IRQ
+ return -EIO;
+#else
+ spin_lock_irq(&rtc_task_lock);
+ if (rtc_callback != task) {
+ spin_unlock_irq(&rtc_task_lock);
+ return -ENXIO;
+ }
+ spin_unlock_irq(&rtc_task_lock);
+ return rtc_do_ioctl(cmd, arg, 1);
+#endif
+}
+
+
+/*
* The various file operations we support.
*/
@@ -818,7 +911,6 @@
module_init(rtc_init);
module_exit(rtc_exit);
-EXPORT_NO_SYMBOLS;
#if RTC_IRQ
/*
diff -r -u linux/include/linux/rtc.h linux-2.4.16/include/linux/rtc.h
--- linux/include/linux/rtc.h Mon Nov 26 14:39:50 2001
+++ linux-2.4.16/include/linux/rtc.h Mon Nov 26 14:40:09 2001
@@ -66,4 +66,17 @@
#define RTC_WKALM_SET _IOW('p', 0x0f, struct rtc_wkalrm)/* Set wakeup alarm*/
#define RTC_WKALM_RD _IOR('p', 0x10, struct rtc_wkalrm)/* Get wakeup alarm*/
+/* Exported functions to other kernel drivers */
+
+#ifdef __KERNEL__
+typedef struct rtc_task {
+ void (*func)(void *private_data);
+ void *private_data;
+} rtc_task_t;
+
+int rtc_register(rtc_task_t *task);
+int rtc_unregister(rtc_task_t *task);
+int rtc_control(rtc_task_t *t, unsigned int cmd, unsigned long arg);
+#endif
+
#endif /* _LINUX_RTC_H_ */
|
