Commit | Line | Data |
---|---|---|
841cb11c AH |
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 | ||
d47908b2 | 16 | #include <linux/time.h> |
bf647ea7 | 17 | #include <linux/module.h> |
841cb11c AH |
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> | |
841cb11c | 24 | #include <linux/uaccess.h> |
b8793260 | 25 | #include <linux/alarmtimer.h> |
841cb11c AH |
26 | #include "android_alarm.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 | ||
32 | static int debug_mask = ANDROID_ALARM_PRINT_INFO; | |
33 | module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP); | |
34 | ||
8a7245ea JP |
35 | #define alarm_dbg(debug_level_mask, fmt, ...) \ |
36 | do { \ | |
37 | if (debug_mask & ANDROID_ALARM_PRINT_##debug_level_mask) \ | |
38 | pr_info(fmt, ##__VA_ARGS__); \ | |
39 | } while (0) | |
841cb11c AH |
40 | |
41 | #define ANDROID_ALARM_WAKEUP_MASK ( \ | |
42 | ANDROID_ALARM_RTC_WAKEUP_MASK | \ | |
43 | ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK) | |
44 | ||
ad220db4 | 45 | /* support old userspace code */ |
841cb11c AH |
46 | #define ANDROID_ALARM_SET_OLD _IOW('a', 2, time_t) /* set alarm */ |
47 | #define ANDROID_ALARM_SET_AND_WAIT_OLD _IOW('a', 3, time_t) | |
48 | ||
49 | static int alarm_opened; | |
50 | static DEFINE_SPINLOCK(alarm_slock); | |
a180c0d6 | 51 | static struct wakeup_source alarm_wake_lock; |
841cb11c AH |
52 | static DECLARE_WAIT_QUEUE_HEAD(alarm_wait_queue); |
53 | static uint32_t alarm_pending; | |
54 | static uint32_t alarm_enabled; | |
55 | static uint32_t wait_pending; | |
56 | ||
b8793260 JS |
57 | struct devalarm { |
58 | union { | |
59 | struct hrtimer hrt; | |
60 | struct alarm alrm; | |
61 | } u; | |
62 | enum android_alarm_type type; | |
63 | }; | |
64 | ||
65 | static struct devalarm alarms[ANDROID_ALARM_TYPE_COUNT]; | |
66 | ||
67 | ||
68 | static int is_wakeup(enum android_alarm_type type) | |
69 | { | |
147cd165 DK |
70 | return (type == ANDROID_ALARM_RTC_WAKEUP || |
71 | type == ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP); | |
b8793260 JS |
72 | } |
73 | ||
74 | ||
75 | static void devalarm_start(struct devalarm *alrm, ktime_t exp) | |
76 | { | |
77 | if (is_wakeup(alrm->type)) | |
78 | alarm_start(&alrm->u.alrm, exp); | |
79 | else | |
80 | hrtimer_start(&alrm->u.hrt, exp, HRTIMER_MODE_ABS); | |
81 | } | |
82 | ||
83 | ||
84 | static int devalarm_try_to_cancel(struct devalarm *alrm) | |
85 | { | |
b8793260 | 86 | if (is_wakeup(alrm->type)) |
147cd165 DK |
87 | return alarm_try_to_cancel(&alrm->u.alrm); |
88 | return hrtimer_try_to_cancel(&alrm->u.hrt); | |
b8793260 JS |
89 | } |
90 | ||
91 | static void devalarm_cancel(struct devalarm *alrm) | |
92 | { | |
93 | if (is_wakeup(alrm->type)) | |
94 | alarm_cancel(&alrm->u.alrm); | |
95 | else | |
96 | hrtimer_cancel(&alrm->u.hrt); | |
97 | } | |
98 | ||
841cb11c AH |
99 | |
100 | static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
101 | { | |
102 | int rv = 0; | |
103 | unsigned long flags; | |
104 | struct timespec new_alarm_time; | |
105 | struct timespec new_rtc_time; | |
106 | struct timespec tmp_time; | |
b8793260 JS |
107 | struct rtc_time new_rtc_tm; |
108 | struct rtc_device *rtc_dev; | |
841cb11c AH |
109 | enum android_alarm_type alarm_type = ANDROID_ALARM_IOCTL_TO_TYPE(cmd); |
110 | uint32_t alarm_type_mask = 1U << alarm_type; | |
111 | ||
112 | if (alarm_type >= ANDROID_ALARM_TYPE_COUNT) | |
113 | return -EINVAL; | |
114 | ||
115 | if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_GET_TIME(0)) { | |
116 | if ((file->f_flags & O_ACCMODE) == O_RDONLY) | |
117 | return -EPERM; | |
118 | if (file->private_data == NULL && | |
119 | cmd != ANDROID_ALARM_SET_RTC) { | |
120 | spin_lock_irqsave(&alarm_slock, flags); | |
121 | if (alarm_opened) { | |
122 | spin_unlock_irqrestore(&alarm_slock, flags); | |
123 | return -EBUSY; | |
124 | } | |
125 | alarm_opened = 1; | |
126 | file->private_data = (void *)1; | |
127 | spin_unlock_irqrestore(&alarm_slock, flags); | |
128 | } | |
129 | } | |
130 | ||
131 | switch (ANDROID_ALARM_BASE_CMD(cmd)) { | |
132 | case ANDROID_ALARM_CLEAR(0): | |
133 | spin_lock_irqsave(&alarm_slock, flags); | |
8a7245ea | 134 | alarm_dbg(IO, "alarm %d clear\n", alarm_type); |
b8793260 | 135 | devalarm_try_to_cancel(&alarms[alarm_type]); |
841cb11c AH |
136 | if (alarm_pending) { |
137 | alarm_pending &= ~alarm_type_mask; | |
138 | if (!alarm_pending && !wait_pending) | |
a180c0d6 | 139 | __pm_relax(&alarm_wake_lock); |
841cb11c AH |
140 | } |
141 | alarm_enabled &= ~alarm_type_mask; | |
142 | spin_unlock_irqrestore(&alarm_slock, flags); | |
143 | break; | |
144 | ||
145 | case ANDROID_ALARM_SET_OLD: | |
146 | case ANDROID_ALARM_SET_AND_WAIT_OLD: | |
147 | if (get_user(new_alarm_time.tv_sec, (int __user *)arg)) { | |
148 | rv = -EFAULT; | |
149 | goto err1; | |
150 | } | |
151 | new_alarm_time.tv_nsec = 0; | |
152 | goto from_old_alarm_set; | |
153 | ||
154 | case ANDROID_ALARM_SET_AND_WAIT(0): | |
155 | case ANDROID_ALARM_SET(0): | |
156 | if (copy_from_user(&new_alarm_time, (void __user *)arg, | |
157 | sizeof(new_alarm_time))) { | |
158 | rv = -EFAULT; | |
159 | goto err1; | |
160 | } | |
161 | from_old_alarm_set: | |
162 | spin_lock_irqsave(&alarm_slock, flags); | |
8a7245ea JP |
163 | alarm_dbg(IO, "alarm %d set %ld.%09ld\n", |
164 | alarm_type, | |
165 | new_alarm_time.tv_sec, new_alarm_time.tv_nsec); | |
841cb11c | 166 | alarm_enabled |= alarm_type_mask; |
b8793260 | 167 | devalarm_start(&alarms[alarm_type], |
841cb11c AH |
168 | timespec_to_ktime(new_alarm_time)); |
169 | spin_unlock_irqrestore(&alarm_slock, flags); | |
170 | if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_SET_AND_WAIT(0) | |
171 | && cmd != ANDROID_ALARM_SET_AND_WAIT_OLD) | |
172 | break; | |
173 | /* fall though */ | |
174 | case ANDROID_ALARM_WAIT: | |
175 | spin_lock_irqsave(&alarm_slock, flags); | |
8a7245ea | 176 | alarm_dbg(IO, "alarm wait\n"); |
841cb11c | 177 | if (!alarm_pending && wait_pending) { |
a180c0d6 | 178 | __pm_relax(&alarm_wake_lock); |
841cb11c AH |
179 | wait_pending = 0; |
180 | } | |
181 | spin_unlock_irqrestore(&alarm_slock, flags); | |
182 | rv = wait_event_interruptible(alarm_wait_queue, alarm_pending); | |
183 | if (rv) | |
184 | goto err1; | |
185 | spin_lock_irqsave(&alarm_slock, flags); | |
186 | rv = alarm_pending; | |
187 | wait_pending = 1; | |
188 | alarm_pending = 0; | |
189 | spin_unlock_irqrestore(&alarm_slock, flags); | |
190 | break; | |
191 | case ANDROID_ALARM_SET_RTC: | |
192 | if (copy_from_user(&new_rtc_time, (void __user *)arg, | |
193 | sizeof(new_rtc_time))) { | |
194 | rv = -EFAULT; | |
195 | goto err1; | |
196 | } | |
b8793260 JS |
197 | rtc_time_to_tm(new_rtc_time.tv_sec, &new_rtc_tm); |
198 | rtc_dev = alarmtimer_get_rtcdev(); | |
199 | rv = do_settimeofday(&new_rtc_time); | |
200 | if (rv < 0) | |
201 | goto err1; | |
202 | if (rtc_dev) | |
203 | rv = rtc_set_time(rtc_dev, &new_rtc_tm); | |
841cb11c AH |
204 | spin_lock_irqsave(&alarm_slock, flags); |
205 | alarm_pending |= ANDROID_ALARM_TIME_CHANGE_MASK; | |
206 | wake_up(&alarm_wait_queue); | |
207 | spin_unlock_irqrestore(&alarm_slock, flags); | |
208 | if (rv < 0) | |
209 | goto err1; | |
210 | break; | |
211 | case ANDROID_ALARM_GET_TIME(0): | |
212 | switch (alarm_type) { | |
213 | case ANDROID_ALARM_RTC_WAKEUP: | |
214 | case ANDROID_ALARM_RTC: | |
215 | getnstimeofday(&tmp_time); | |
216 | break; | |
217 | case ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP: | |
218 | case ANDROID_ALARM_ELAPSED_REALTIME: | |
e2d8ccef | 219 | get_monotonic_boottime(&tmp_time); |
841cb11c | 220 | break; |
841cb11c AH |
221 | case ANDROID_ALARM_SYSTEMTIME: |
222 | ktime_get_ts(&tmp_time); | |
223 | break; | |
147cd165 DK |
224 | default: |
225 | rv = -EINVAL; | |
226 | goto err1; | |
841cb11c AH |
227 | } |
228 | if (copy_to_user((void __user *)arg, &tmp_time, | |
229 | sizeof(tmp_time))) { | |
230 | rv = -EFAULT; | |
231 | goto err1; | |
232 | } | |
233 | break; | |
234 | ||
235 | default: | |
236 | rv = -EINVAL; | |
841cb11c AH |
237 | } |
238 | err1: | |
239 | return rv; | |
240 | } | |
241 | ||
242 | static int alarm_open(struct inode *inode, struct file *file) | |
243 | { | |
244 | file->private_data = NULL; | |
245 | return 0; | |
246 | } | |
247 | ||
248 | static int alarm_release(struct inode *inode, struct file *file) | |
249 | { | |
250 | int i; | |
251 | unsigned long flags; | |
252 | ||
253 | spin_lock_irqsave(&alarm_slock, flags); | |
592314e9 | 254 | if (file->private_data) { |
841cb11c AH |
255 | for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) { |
256 | uint32_t alarm_type_mask = 1U << i; | |
257 | if (alarm_enabled & alarm_type_mask) { | |
8a7245ea JP |
258 | alarm_dbg(INFO, |
259 | "%s: clear alarm, pending %d\n", | |
260 | __func__, | |
261 | !!(alarm_pending & alarm_type_mask)); | |
841cb11c AH |
262 | alarm_enabled &= ~alarm_type_mask; |
263 | } | |
264 | spin_unlock_irqrestore(&alarm_slock, flags); | |
b8793260 | 265 | devalarm_cancel(&alarms[i]); |
841cb11c AH |
266 | spin_lock_irqsave(&alarm_slock, flags); |
267 | } | |
268 | if (alarm_pending | wait_pending) { | |
269 | if (alarm_pending) | |
8a7245ea JP |
270 | alarm_dbg(INFO, "%s: clear pending alarms %x\n", |
271 | __func__, alarm_pending); | |
a180c0d6 | 272 | __pm_relax(&alarm_wake_lock); |
841cb11c AH |
273 | wait_pending = 0; |
274 | alarm_pending = 0; | |
275 | } | |
276 | alarm_opened = 0; | |
277 | } | |
278 | spin_unlock_irqrestore(&alarm_slock, flags); | |
279 | return 0; | |
280 | } | |
281 | ||
b8793260 | 282 | static void devalarm_triggered(struct devalarm *alarm) |
841cb11c AH |
283 | { |
284 | unsigned long flags; | |
285 | uint32_t alarm_type_mask = 1U << alarm->type; | |
286 | ||
8a7245ea | 287 | alarm_dbg(INT, "%s: type %d\n", __func__, alarm->type); |
841cb11c AH |
288 | spin_lock_irqsave(&alarm_slock, flags); |
289 | if (alarm_enabled & alarm_type_mask) { | |
a180c0d6 | 290 | __pm_wakeup_event(&alarm_wake_lock, 5000); /* 5secs */ |
841cb11c AH |
291 | alarm_enabled &= ~alarm_type_mask; |
292 | alarm_pending |= alarm_type_mask; | |
293 | wake_up(&alarm_wait_queue); | |
294 | } | |
295 | spin_unlock_irqrestore(&alarm_slock, flags); | |
296 | } | |
297 | ||
b8793260 JS |
298 | |
299 | static enum hrtimer_restart devalarm_hrthandler(struct hrtimer *hrt) | |
300 | { | |
301 | struct devalarm *devalrm = container_of(hrt, struct devalarm, u.hrt); | |
302 | ||
303 | devalarm_triggered(devalrm); | |
304 | return HRTIMER_NORESTART; | |
305 | } | |
306 | ||
307 | static enum alarmtimer_restart devalarm_alarmhandler(struct alarm *alrm, | |
308 | ktime_t now) | |
309 | { | |
310 | struct devalarm *devalrm = container_of(alrm, struct devalarm, u.alrm); | |
311 | ||
312 | devalarm_triggered(devalrm); | |
313 | return ALARMTIMER_NORESTART; | |
314 | } | |
315 | ||
316 | ||
841cb11c AH |
317 | static const struct file_operations alarm_fops = { |
318 | .owner = THIS_MODULE, | |
319 | .unlocked_ioctl = alarm_ioctl, | |
320 | .open = alarm_open, | |
321 | .release = alarm_release, | |
322 | }; | |
323 | ||
324 | static struct miscdevice alarm_device = { | |
325 | .minor = MISC_DYNAMIC_MINOR, | |
326 | .name = "alarm", | |
327 | .fops = &alarm_fops, | |
328 | }; | |
329 | ||
330 | static int __init alarm_dev_init(void) | |
331 | { | |
332 | int err; | |
333 | int i; | |
334 | ||
335 | err = misc_register(&alarm_device); | |
336 | if (err) | |
337 | return err; | |
338 | ||
b8793260 JS |
339 | alarm_init(&alarms[ANDROID_ALARM_RTC_WAKEUP].u.alrm, |
340 | ALARM_REALTIME, devalarm_alarmhandler); | |
341 | hrtimer_init(&alarms[ANDROID_ALARM_RTC].u.hrt, | |
342 | CLOCK_REALTIME, HRTIMER_MODE_ABS); | |
343 | alarm_init(&alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP].u.alrm, | |
344 | ALARM_BOOTTIME, devalarm_alarmhandler); | |
345 | hrtimer_init(&alarms[ANDROID_ALARM_ELAPSED_REALTIME].u.hrt, | |
346 | CLOCK_BOOTTIME, HRTIMER_MODE_ABS); | |
347 | hrtimer_init(&alarms[ANDROID_ALARM_SYSTEMTIME].u.hrt, | |
348 | CLOCK_MONOTONIC, HRTIMER_MODE_ABS); | |
349 | ||
350 | for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) { | |
351 | alarms[i].type = i; | |
352 | if (!is_wakeup(i)) | |
353 | alarms[i].u.hrt.function = devalarm_hrthandler; | |
354 | } | |
355 | ||
a180c0d6 | 356 | wakeup_source_init(&alarm_wake_lock, "alarm"); |
841cb11c AH |
357 | return 0; |
358 | } | |
359 | ||
360 | static void __exit alarm_dev_exit(void) | |
361 | { | |
362 | misc_deregister(&alarm_device); | |
a180c0d6 | 363 | wakeup_source_trash(&alarm_wake_lock); |
841cb11c AH |
364 | } |
365 | ||
366 | module_init(alarm_dev_init); | |
367 | module_exit(alarm_dev_exit); | |
368 |