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authorJonathan Herman <hermanjl@cs.unc.edu>2013-01-22 10:38:37 -0500
committerJonathan Herman <hermanjl@cs.unc.edu>2013-01-22 10:38:37 -0500
commitfcc9d2e5a6c89d22b8b773a64fb4ad21ac318446 (patch)
treea57612d1888735a2ec7972891b68c1ac5ec8faea /drivers/rtc/alarm-dev.c
parent8dea78da5cee153b8af9c07a2745f6c55057fe12 (diff)
Added missing tegra files.HEADmaster
Diffstat (limited to 'drivers/rtc/alarm-dev.c')
-rw-r--r--drivers/rtc/alarm-dev.c286
1 files changed, 286 insertions, 0 deletions
diff --git a/drivers/rtc/alarm-dev.c b/drivers/rtc/alarm-dev.c
new file mode 100644
index 00000000000..686e6f7ed48
--- /dev/null
+++ b/drivers/rtc/alarm-dev.c
@@ -0,0 +1,286 @@
1/* drivers/rtc/alarm-dev.c
2 *
3 * Copyright (C) 2007-2009 Google, Inc.
4 *
5 * This software is licensed under the terms of the GNU General Public
6 * License version 2, as published by the Free Software Foundation, and
7 * may be copied, distributed, and modified under those terms.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 */
15
16#include <asm/mach/time.h>
17#include <linux/android_alarm.h>
18#include <linux/device.h>
19#include <linux/miscdevice.h>
20#include <linux/fs.h>
21#include <linux/platform_device.h>
22#include <linux/sched.h>
23#include <linux/spinlock.h>
24#include <linux/sysdev.h>
25#include <linux/uaccess.h>
26#include <linux/wakelock.h>
27
28#define ANDROID_ALARM_PRINT_INFO (1U << 0)
29#define ANDROID_ALARM_PRINT_IO (1U << 1)
30#define ANDROID_ALARM_PRINT_INT (1U << 2)
31
32static int debug_mask = ANDROID_ALARM_PRINT_INFO;
33module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
34
35#define pr_alarm(debug_level_mask, args...) \
36 do { \
37 if (debug_mask & ANDROID_ALARM_PRINT_##debug_level_mask) { \
38 pr_info(args); \
39 } \
40 } while (0)
41
42#define ANDROID_ALARM_WAKEUP_MASK ( \
43 ANDROID_ALARM_RTC_WAKEUP_MASK | \
44 ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK)
45
46/* support old usespace code */
47#define ANDROID_ALARM_SET_OLD _IOW('a', 2, time_t) /* set alarm */
48#define ANDROID_ALARM_SET_AND_WAIT_OLD _IOW('a', 3, time_t)
49
50static int alarm_opened;
51static DEFINE_SPINLOCK(alarm_slock);
52static struct wake_lock alarm_wake_lock;
53static DECLARE_WAIT_QUEUE_HEAD(alarm_wait_queue);
54static uint32_t alarm_pending;
55static uint32_t alarm_enabled;
56static uint32_t wait_pending;
57
58static struct alarm alarms[ANDROID_ALARM_TYPE_COUNT];
59
60static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
61{
62 int rv = 0;
63 unsigned long flags;
64 struct timespec new_alarm_time;
65 struct timespec new_rtc_time;
66 struct timespec tmp_time;
67 enum android_alarm_type alarm_type = ANDROID_ALARM_IOCTL_TO_TYPE(cmd);
68 uint32_t alarm_type_mask = 1U << alarm_type;
69
70 if (alarm_type >= ANDROID_ALARM_TYPE_COUNT)
71 return -EINVAL;
72
73 if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_GET_TIME(0)) {
74 if ((file->f_flags & O_ACCMODE) == O_RDONLY)
75 return -EPERM;
76 if (file->private_data == NULL &&
77 cmd != ANDROID_ALARM_SET_RTC) {
78 spin_lock_irqsave(&alarm_slock, flags);
79 if (alarm_opened) {
80 spin_unlock_irqrestore(&alarm_slock, flags);
81 return -EBUSY;
82 }
83 alarm_opened = 1;
84 file->private_data = (void *)1;
85 spin_unlock_irqrestore(&alarm_slock, flags);
86 }
87 }
88
89 switch (ANDROID_ALARM_BASE_CMD(cmd)) {
90 case ANDROID_ALARM_CLEAR(0):
91 spin_lock_irqsave(&alarm_slock, flags);
92 pr_alarm(IO, "alarm %d clear\n", alarm_type);
93 alarm_try_to_cancel(&alarms[alarm_type]);
94 if (alarm_pending) {
95 alarm_pending &= ~alarm_type_mask;
96 if (!alarm_pending && !wait_pending)
97 wake_unlock(&alarm_wake_lock);
98 }
99 alarm_enabled &= ~alarm_type_mask;
100 spin_unlock_irqrestore(&alarm_slock, flags);
101 break;
102
103 case ANDROID_ALARM_SET_OLD:
104 case ANDROID_ALARM_SET_AND_WAIT_OLD:
105 if (get_user(new_alarm_time.tv_sec, (int __user *)arg)) {
106 rv = -EFAULT;
107 goto err1;
108 }
109 new_alarm_time.tv_nsec = 0;
110 goto from_old_alarm_set;
111
112 case ANDROID_ALARM_SET_AND_WAIT(0):
113 case ANDROID_ALARM_SET(0):
114 if (copy_from_user(&new_alarm_time, (void __user *)arg,
115 sizeof(new_alarm_time))) {
116 rv = -EFAULT;
117 goto err1;
118 }
119from_old_alarm_set:
120 spin_lock_irqsave(&alarm_slock, flags);
121 pr_alarm(IO, "alarm %d set %ld.%09ld\n", alarm_type,
122 new_alarm_time.tv_sec, new_alarm_time.tv_nsec);
123 alarm_enabled |= alarm_type_mask;
124 alarm_start_range(&alarms[alarm_type],
125 timespec_to_ktime(new_alarm_time),
126 timespec_to_ktime(new_alarm_time));
127 spin_unlock_irqrestore(&alarm_slock, flags);
128 if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_SET_AND_WAIT(0)
129 && cmd != ANDROID_ALARM_SET_AND_WAIT_OLD)
130 break;
131 /* fall though */
132 case ANDROID_ALARM_WAIT:
133 spin_lock_irqsave(&alarm_slock, flags);
134 pr_alarm(IO, "alarm wait\n");
135 if (!alarm_pending && wait_pending) {
136 wake_unlock(&alarm_wake_lock);
137 wait_pending = 0;
138 }
139 spin_unlock_irqrestore(&alarm_slock, flags);
140 rv = wait_event_interruptible(alarm_wait_queue, alarm_pending);
141 if (rv)
142 goto err1;
143 spin_lock_irqsave(&alarm_slock, flags);
144 rv = alarm_pending;
145 wait_pending = 1;
146 alarm_pending = 0;
147 spin_unlock_irqrestore(&alarm_slock, flags);
148 break;
149 case ANDROID_ALARM_SET_RTC:
150 if (copy_from_user(&new_rtc_time, (void __user *)arg,
151 sizeof(new_rtc_time))) {
152 rv = -EFAULT;
153 goto err1;
154 }
155 rv = alarm_set_rtc(new_rtc_time);
156 spin_lock_irqsave(&alarm_slock, flags);
157 alarm_pending |= ANDROID_ALARM_TIME_CHANGE_MASK;
158 wake_up(&alarm_wait_queue);
159 spin_unlock_irqrestore(&alarm_slock, flags);
160 if (rv < 0)
161 goto err1;
162 break;
163 case ANDROID_ALARM_GET_TIME(0):
164 switch (alarm_type) {
165 case ANDROID_ALARM_RTC_WAKEUP:
166 case ANDROID_ALARM_RTC:
167 getnstimeofday(&tmp_time);
168 break;
169 case ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP:
170 case ANDROID_ALARM_ELAPSED_REALTIME:
171 tmp_time =
172 ktime_to_timespec(alarm_get_elapsed_realtime());
173 break;
174 case ANDROID_ALARM_TYPE_COUNT:
175 case ANDROID_ALARM_SYSTEMTIME:
176 ktime_get_ts(&tmp_time);
177 break;
178 }
179 if (copy_to_user((void __user *)arg, &tmp_time,
180 sizeof(tmp_time))) {
181 rv = -EFAULT;
182 goto err1;
183 }
184 break;
185
186 default:
187 rv = -EINVAL;
188 goto err1;
189 }
190err1:
191 return rv;
192}
193
194static int alarm_open(struct inode *inode, struct file *file)
195{
196 file->private_data = NULL;
197 return 0;
198}
199
200static int alarm_release(struct inode *inode, struct file *file)
201{
202 int i;
203 unsigned long flags;
204
205 spin_lock_irqsave(&alarm_slock, flags);
206 if (file->private_data != 0) {
207 for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
208 uint32_t alarm_type_mask = 1U << i;
209 if (alarm_enabled & alarm_type_mask) {
210 pr_alarm(INFO, "alarm_release: clear alarm, "
211 "pending %d\n",
212 !!(alarm_pending & alarm_type_mask));
213 alarm_enabled &= ~alarm_type_mask;
214 }
215 spin_unlock_irqrestore(&alarm_slock, flags);
216 alarm_cancel(&alarms[i]);
217 spin_lock_irqsave(&alarm_slock, flags);
218 }
219 if (alarm_pending | wait_pending) {
220 if (alarm_pending)
221 pr_alarm(INFO, "alarm_release: clear "
222 "pending alarms %x\n", alarm_pending);
223 wake_unlock(&alarm_wake_lock);
224 wait_pending = 0;
225 alarm_pending = 0;
226 }
227 alarm_opened = 0;
228 }
229 spin_unlock_irqrestore(&alarm_slock, flags);
230 return 0;
231}
232
233static void alarm_triggered(struct alarm *alarm)
234{
235 unsigned long flags;
236 uint32_t alarm_type_mask = 1U << alarm->type;
237
238 pr_alarm(INT, "alarm_triggered type %d\n", alarm->type);
239 spin_lock_irqsave(&alarm_slock, flags);
240 if (alarm_enabled & alarm_type_mask) {
241 wake_lock_timeout(&alarm_wake_lock, 5 * HZ);
242 alarm_enabled &= ~alarm_type_mask;
243 alarm_pending |= alarm_type_mask;
244 wake_up(&alarm_wait_queue);
245 }
246 spin_unlock_irqrestore(&alarm_slock, flags);
247}
248
249static const struct file_operations alarm_fops = {
250 .owner = THIS_MODULE,
251 .unlocked_ioctl = alarm_ioctl,
252 .open = alarm_open,
253 .release = alarm_release,
254};
255
256static struct miscdevice alarm_device = {
257 .minor = MISC_DYNAMIC_MINOR,
258 .name = "alarm",
259 .fops = &alarm_fops,
260};
261
262static int __init alarm_dev_init(void)
263{
264 int err;
265 int i;
266
267 err = misc_register(&alarm_device);
268 if (err)
269 return err;
270
271 for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++)
272 alarm_init(&alarms[i], i, alarm_triggered);
273 wake_lock_init(&alarm_wake_lock, WAKE_LOCK_SUSPEND, "alarm");
274
275 return 0;
276}
277
278static void __exit alarm_dev_exit(void)
279{
280 misc_deregister(&alarm_device);
281 wake_lock_destroy(&alarm_wake_lock);
282}
283
284module_init(alarm_dev_init);
285module_exit(alarm_dev_exit);
286
generated by cgit v1.2.2 (git 2.25.0) at 2025-04-22 06:17:57 -0400