John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Alarmtimer interface |
| 3 | * |
| 4 | * This interface provides a timer which is similarto hrtimers, |
| 5 | * but triggers a RTC alarm if the box is suspend. |
| 6 | * |
| 7 | * This interface is influenced by the Android RTC Alarm timer |
| 8 | * interface. |
| 9 | * |
| 10 | * Copyright (C) 2010 IBM Corperation |
| 11 | * |
| 12 | * Author: John Stultz <john.stultz@linaro.org> |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License version 2 as |
| 16 | * published by the Free Software Foundation. |
| 17 | */ |
| 18 | #include <linux/time.h> |
| 19 | #include <linux/hrtimer.h> |
| 20 | #include <linux/timerqueue.h> |
| 21 | #include <linux/rtc.h> |
| 22 | #include <linux/alarmtimer.h> |
| 23 | #include <linux/mutex.h> |
| 24 | #include <linux/platform_device.h> |
| 25 | #include <linux/posix-timers.h> |
| 26 | #include <linux/workqueue.h> |
| 27 | #include <linux/freezer.h> |
Mao Jinlong | 2e1a4ae | 2016-02-17 15:21:49 +0800 | [diff] [blame^] | 28 | #include <linux/workqueue.h> |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 29 | |
John Stultz | 180bf81 | 2011-04-28 12:58:11 -0700 | [diff] [blame] | 30 | /** |
| 31 | * struct alarm_base - Alarm timer bases |
| 32 | * @lock: Lock for syncrhonized access to the base |
| 33 | * @timerqueue: Timerqueue head managing the list of events |
John Stultz | 180bf81 | 2011-04-28 12:58:11 -0700 | [diff] [blame] | 34 | * @gettime: Function to read the time correlating to the base |
| 35 | * @base_clockid: clockid for the base |
John Stultz | 180bf81 | 2011-04-28 12:58:11 -0700 | [diff] [blame] | 36 | */ |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 37 | static struct alarm_base { |
| 38 | spinlock_t lock; |
| 39 | struct timerqueue_head timerqueue; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 40 | ktime_t (*gettime)(void); |
| 41 | clockid_t base_clockid; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 42 | } alarm_bases[ALARM_NUMTYPE]; |
| 43 | |
John Stultz | c008ba58 | 2011-06-16 18:27:09 -0700 | [diff] [blame] | 44 | /* freezer delta & lock used to handle clock_nanosleep triggered wakeups */ |
| 45 | static ktime_t freezer_delta; |
| 46 | static DEFINE_SPINLOCK(freezer_delta_lock); |
| 47 | |
Todd Poynor | 59a93c2 | 2012-08-09 00:37:27 -0700 | [diff] [blame] | 48 | static struct wakeup_source *ws; |
Mao Jinlong | 2e1a4ae | 2016-02-17 15:21:49 +0800 | [diff] [blame^] | 49 | static struct delayed_work work; |
| 50 | static struct workqueue_struct *power_off_alarm_workqueue; |
Todd Poynor | 59a93c2 | 2012-08-09 00:37:27 -0700 | [diff] [blame] | 51 | |
John Stultz | 472647d | 2011-04-29 15:03:10 -0700 | [diff] [blame] | 52 | #ifdef CONFIG_RTC_CLASS |
John Stultz | 180bf81 | 2011-04-28 12:58:11 -0700 | [diff] [blame] | 53 | /* rtc timer and device for setting alarm wakeups at suspend */ |
Thomas Gleixner | c5e14e7 | 2012-03-24 12:46:23 +0100 | [diff] [blame] | 54 | static struct rtc_timer rtctimer; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 55 | static struct rtc_device *rtcdev; |
John Stultz | c008ba58 | 2011-06-16 18:27:09 -0700 | [diff] [blame] | 56 | static DEFINE_SPINLOCK(rtcdev_lock); |
Mao Jinlong | 2e1a4ae | 2016-02-17 15:21:49 +0800 | [diff] [blame^] | 57 | static struct mutex power_on_alarm_lock; |
| 58 | static struct alarm init_alarm; |
| 59 | |
| 60 | /** |
| 61 | * power_on_alarm_init - Init power on alarm value |
| 62 | * |
| 63 | * Read rtc alarm value after device booting up and add this alarm |
| 64 | * into alarm queue. |
| 65 | */ |
| 66 | void power_on_alarm_init(void) |
| 67 | { |
| 68 | struct rtc_wkalrm rtc_alarm; |
| 69 | struct rtc_time rt; |
| 70 | unsigned long alarm_time; |
| 71 | struct rtc_device *rtc; |
| 72 | ktime_t alarm_ktime; |
| 73 | |
| 74 | rtc = alarmtimer_get_rtcdev(); |
| 75 | |
| 76 | if (!rtc) |
| 77 | return; |
| 78 | |
| 79 | rtc_read_alarm(rtc, &rtc_alarm); |
| 80 | rt = rtc_alarm.time; |
| 81 | |
| 82 | rtc_tm_to_time(&rt, &alarm_time); |
| 83 | |
| 84 | if (alarm_time) { |
| 85 | alarm_ktime = ktime_set(alarm_time, 0); |
| 86 | alarm_init(&init_alarm, ALARM_POWEROFF_REALTIME, NULL); |
| 87 | alarm_start(&init_alarm, alarm_ktime); |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * set_power_on_alarm - set power on alarm value into rtc register |
| 93 | * |
| 94 | * Get the soonest power off alarm timer and set the alarm value into rtc |
| 95 | * register. |
| 96 | */ |
| 97 | void set_power_on_alarm(void) |
| 98 | { |
| 99 | int rc; |
| 100 | struct timespec wall_time, alarm_ts; |
| 101 | long alarm_secs = 0l; |
| 102 | long rtc_secs, alarm_time, alarm_delta; |
| 103 | struct rtc_time rtc_time; |
| 104 | struct rtc_wkalrm alarm; |
| 105 | struct rtc_device *rtc; |
| 106 | struct timerqueue_node *next; |
| 107 | unsigned long flags; |
| 108 | struct alarm_base *base = &alarm_bases[ALARM_POWEROFF_REALTIME]; |
| 109 | |
| 110 | rc = mutex_lock_interruptible(&power_on_alarm_lock); |
| 111 | if (rc != 0) |
| 112 | return; |
| 113 | |
| 114 | spin_lock_irqsave(&base->lock, flags); |
| 115 | next = timerqueue_getnext(&base->timerqueue); |
| 116 | spin_unlock_irqrestore(&base->lock, flags); |
| 117 | |
| 118 | if (next) { |
| 119 | alarm_ts = ktime_to_timespec(next->expires); |
| 120 | alarm_secs = alarm_ts.tv_sec; |
| 121 | } |
| 122 | |
| 123 | if (!alarm_secs) |
| 124 | goto disable_alarm; |
| 125 | |
| 126 | getnstimeofday(&wall_time); |
| 127 | |
| 128 | /* |
| 129 | * alarm_secs have to be bigger than "wall_time +1". |
| 130 | * It is to make sure that alarm time will be always |
| 131 | * bigger than wall time. |
| 132 | */ |
| 133 | if (alarm_secs <= wall_time.tv_sec + 1) |
| 134 | goto disable_alarm; |
| 135 | |
| 136 | rtc = alarmtimer_get_rtcdev(); |
| 137 | if (!rtc) |
| 138 | goto exit; |
| 139 | |
| 140 | rtc_read_time(rtc, &rtc_time); |
| 141 | rtc_tm_to_time(&rtc_time, &rtc_secs); |
| 142 | alarm_delta = wall_time.tv_sec - rtc_secs; |
| 143 | alarm_time = alarm_secs - alarm_delta; |
| 144 | |
| 145 | rtc_time_to_tm(alarm_time, &alarm.time); |
| 146 | alarm.enabled = 1; |
| 147 | rc = rtc_set_alarm(rtcdev, &alarm); |
| 148 | if (rc) |
| 149 | goto disable_alarm; |
| 150 | |
| 151 | mutex_unlock(&power_on_alarm_lock); |
| 152 | return; |
| 153 | |
| 154 | disable_alarm: |
| 155 | rtc_alarm_irq_enable(rtcdev, 0); |
| 156 | exit: |
| 157 | mutex_unlock(&power_on_alarm_lock); |
| 158 | } |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 159 | |
Mao Jinlong | a0adcbc | 2016-02-17 15:19:08 +0800 | [diff] [blame] | 160 | static void alarmtimer_triggered_func(void *p) |
| 161 | { |
| 162 | struct rtc_device *rtc = rtcdev; |
| 163 | |
| 164 | if (!(rtc->irq_data & RTC_AF)) |
| 165 | return; |
| 166 | __pm_wakeup_event(ws, 2 * MSEC_PER_SEC); |
| 167 | } |
| 168 | |
| 169 | static struct rtc_task alarmtimer_rtc_task = { |
| 170 | .func = alarmtimer_triggered_func |
| 171 | }; |
John Stultz | c008ba58 | 2011-06-16 18:27:09 -0700 | [diff] [blame] | 172 | /** |
John Stultz | c008ba58 | 2011-06-16 18:27:09 -0700 | [diff] [blame] | 173 | * alarmtimer_get_rtcdev - Return selected rtcdevice |
| 174 | * |
| 175 | * This function returns the rtc device to use for wakealarms. |
| 176 | * If one has not already been chosen, it checks to see if a |
| 177 | * functional rtc device is available. |
| 178 | */ |
John Stultz | 57c498f | 2012-04-20 12:31:45 -0700 | [diff] [blame] | 179 | struct rtc_device *alarmtimer_get_rtcdev(void) |
John Stultz | c008ba58 | 2011-06-16 18:27:09 -0700 | [diff] [blame] | 180 | { |
John Stultz | c008ba58 | 2011-06-16 18:27:09 -0700 | [diff] [blame] | 181 | unsigned long flags; |
Mao Jinlong | a0adcbc | 2016-02-17 15:19:08 +0800 | [diff] [blame] | 182 | struct rtc_device *ret = NULL; |
John Stultz | c008ba58 | 2011-06-16 18:27:09 -0700 | [diff] [blame] | 183 | |
| 184 | spin_lock_irqsave(&rtcdev_lock, flags); |
John Stultz | c008ba58 | 2011-06-16 18:27:09 -0700 | [diff] [blame] | 185 | ret = rtcdev; |
| 186 | spin_unlock_irqrestore(&rtcdev_lock, flags); |
| 187 | |
| 188 | return ret; |
| 189 | } |
Pramod Gurav | 71d5d2b | 2014-06-13 11:49:42 +0530 | [diff] [blame] | 190 | EXPORT_SYMBOL_GPL(alarmtimer_get_rtcdev); |
John Stultz | 8bc0daf | 2011-07-14 18:35:13 -0700 | [diff] [blame] | 191 | |
| 192 | static int alarmtimer_rtc_add_device(struct device *dev, |
| 193 | struct class_interface *class_intf) |
| 194 | { |
| 195 | unsigned long flags; |
Mao Jinlong | a0adcbc | 2016-02-17 15:19:08 +0800 | [diff] [blame] | 196 | int err = 0; |
John Stultz | 8bc0daf | 2011-07-14 18:35:13 -0700 | [diff] [blame] | 197 | struct rtc_device *rtc = to_rtc_device(dev); |
John Stultz | 8bc0daf | 2011-07-14 18:35:13 -0700 | [diff] [blame] | 198 | if (rtcdev) |
| 199 | return -EBUSY; |
John Stultz | 8bc0daf | 2011-07-14 18:35:13 -0700 | [diff] [blame] | 200 | if (!rtc->ops->set_alarm) |
| 201 | return -1; |
John Stultz | 8bc0daf | 2011-07-14 18:35:13 -0700 | [diff] [blame] | 202 | |
| 203 | spin_lock_irqsave(&rtcdev_lock, flags); |
| 204 | if (!rtcdev) { |
Mao Jinlong | a0adcbc | 2016-02-17 15:19:08 +0800 | [diff] [blame] | 205 | err = rtc_irq_register(rtc, &alarmtimer_rtc_task); |
| 206 | if (err) |
| 207 | goto rtc_irq_reg_err; |
John Stultz | 8bc0daf | 2011-07-14 18:35:13 -0700 | [diff] [blame] | 208 | rtcdev = rtc; |
| 209 | /* hold a reference so it doesn't go away */ |
| 210 | get_device(dev); |
| 211 | } |
Mao Jinlong | a0adcbc | 2016-02-17 15:19:08 +0800 | [diff] [blame] | 212 | |
| 213 | rtc_irq_reg_err: |
John Stultz | 8bc0daf | 2011-07-14 18:35:13 -0700 | [diff] [blame] | 214 | spin_unlock_irqrestore(&rtcdev_lock, flags); |
Mao Jinlong | a0adcbc | 2016-02-17 15:19:08 +0800 | [diff] [blame] | 215 | return err; |
| 216 | |
| 217 | } |
| 218 | |
| 219 | static void alarmtimer_rtc_remove_device(struct device *dev, |
| 220 | struct class_interface *class_intf) |
| 221 | { |
| 222 | if (rtcdev && dev == &rtcdev->dev) { |
| 223 | rtc_irq_unregister(rtcdev, &alarmtimer_rtc_task); |
| 224 | rtcdev = NULL; |
| 225 | } |
John Stultz | 8bc0daf | 2011-07-14 18:35:13 -0700 | [diff] [blame] | 226 | } |
| 227 | |
Thomas Gleixner | c5e14e7 | 2012-03-24 12:46:23 +0100 | [diff] [blame] | 228 | static inline void alarmtimer_rtc_timer_init(void) |
| 229 | { |
Mao Jinlong | 2e1a4ae | 2016-02-17 15:21:49 +0800 | [diff] [blame^] | 230 | mutex_init(&power_on_alarm_lock); |
| 231 | |
Thomas Gleixner | c5e14e7 | 2012-03-24 12:46:23 +0100 | [diff] [blame] | 232 | rtc_timer_init(&rtctimer, NULL, NULL); |
| 233 | } |
| 234 | |
John Stultz | 8bc0daf | 2011-07-14 18:35:13 -0700 | [diff] [blame] | 235 | static struct class_interface alarmtimer_rtc_interface = { |
| 236 | .add_dev = &alarmtimer_rtc_add_device, |
Mao Jinlong | a0adcbc | 2016-02-17 15:19:08 +0800 | [diff] [blame] | 237 | .remove_dev = &alarmtimer_rtc_remove_device, |
John Stultz | 8bc0daf | 2011-07-14 18:35:13 -0700 | [diff] [blame] | 238 | }; |
| 239 | |
Thomas Gleixner | 4523f6a | 2011-09-14 10:54:29 +0200 | [diff] [blame] | 240 | static int alarmtimer_rtc_interface_setup(void) |
John Stultz | 8bc0daf | 2011-07-14 18:35:13 -0700 | [diff] [blame] | 241 | { |
| 242 | alarmtimer_rtc_interface.class = rtc_class; |
Thomas Gleixner | 4523f6a | 2011-09-14 10:54:29 +0200 | [diff] [blame] | 243 | return class_interface_register(&alarmtimer_rtc_interface); |
| 244 | } |
| 245 | static void alarmtimer_rtc_interface_remove(void) |
| 246 | { |
| 247 | class_interface_unregister(&alarmtimer_rtc_interface); |
John Stultz | 8bc0daf | 2011-07-14 18:35:13 -0700 | [diff] [blame] | 248 | } |
John Stultz | 1c6b39a | 2011-06-16 18:47:37 -0700 | [diff] [blame] | 249 | #else |
John Stultz | 57c498f | 2012-04-20 12:31:45 -0700 | [diff] [blame] | 250 | struct rtc_device *alarmtimer_get_rtcdev(void) |
Thomas Gleixner | 4523f6a | 2011-09-14 10:54:29 +0200 | [diff] [blame] | 251 | { |
| 252 | return NULL; |
| 253 | } |
| 254 | #define rtcdev (NULL) |
| 255 | static inline int alarmtimer_rtc_interface_setup(void) { return 0; } |
| 256 | static inline void alarmtimer_rtc_interface_remove(void) { } |
Thomas Gleixner | c5e14e7 | 2012-03-24 12:46:23 +0100 | [diff] [blame] | 257 | static inline void alarmtimer_rtc_timer_init(void) { } |
Mao Jinlong | 2e1a4ae | 2016-02-17 15:21:49 +0800 | [diff] [blame^] | 258 | void set_power_on_alarm(void) { } |
John Stultz | c008ba58 | 2011-06-16 18:27:09 -0700 | [diff] [blame] | 259 | #endif |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 260 | |
Mao Jinlong | 2e1a4ae | 2016-02-17 15:21:49 +0800 | [diff] [blame^] | 261 | static void alarm_work_func(struct work_struct *unused) |
| 262 | { |
| 263 | set_power_on_alarm(); |
| 264 | } |
| 265 | |
John Stultz | 180bf81 | 2011-04-28 12:58:11 -0700 | [diff] [blame] | 266 | /** |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 267 | * alarmtimer_enqueue - Adds an alarm timer to an alarm_base timerqueue |
| 268 | * @base: pointer to the base where the timer is being run |
| 269 | * @alarm: pointer to alarm being enqueued. |
| 270 | * |
John Stultz | dae373b | 2012-09-13 19:12:16 -0400 | [diff] [blame] | 271 | * Adds alarm to a alarm_base timerqueue |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 272 | * |
| 273 | * Must hold base->lock when calling. |
| 274 | */ |
| 275 | static void alarmtimer_enqueue(struct alarm_base *base, struct alarm *alarm) |
| 276 | { |
John Stultz | dae373b | 2012-09-13 19:12:16 -0400 | [diff] [blame] | 277 | if (alarm->state & ALARMTIMER_STATE_ENQUEUED) |
| 278 | timerqueue_del(&base->timerqueue, &alarm->node); |
| 279 | |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 280 | timerqueue_add(&base->timerqueue, &alarm->node); |
John Stultz | a28cde8 | 2011-08-10 12:30:21 -0700 | [diff] [blame] | 281 | alarm->state |= ALARMTIMER_STATE_ENQUEUED; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 282 | } |
| 283 | |
John Stultz | 180bf81 | 2011-04-28 12:58:11 -0700 | [diff] [blame] | 284 | /** |
John Stultz | a65bcc1 | 2012-09-13 19:25:22 -0400 | [diff] [blame] | 285 | * alarmtimer_dequeue - Removes an alarm timer from an alarm_base timerqueue |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 286 | * @base: pointer to the base where the timer is running |
| 287 | * @alarm: pointer to alarm being removed |
| 288 | * |
John Stultz | dae373b | 2012-09-13 19:12:16 -0400 | [diff] [blame] | 289 | * Removes alarm to a alarm_base timerqueue |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 290 | * |
| 291 | * Must hold base->lock when calling. |
| 292 | */ |
John Stultz | a65bcc1 | 2012-09-13 19:25:22 -0400 | [diff] [blame] | 293 | static void alarmtimer_dequeue(struct alarm_base *base, struct alarm *alarm) |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 294 | { |
John Stultz | a28cde8 | 2011-08-10 12:30:21 -0700 | [diff] [blame] | 295 | if (!(alarm->state & ALARMTIMER_STATE_ENQUEUED)) |
| 296 | return; |
| 297 | |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 298 | timerqueue_del(&base->timerqueue, &alarm->node); |
John Stultz | a28cde8 | 2011-08-10 12:30:21 -0700 | [diff] [blame] | 299 | alarm->state &= ~ALARMTIMER_STATE_ENQUEUED; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 300 | } |
| 301 | |
John Stultz | 7068b7a | 2011-04-28 13:29:18 -0700 | [diff] [blame] | 302 | |
John Stultz | 180bf81 | 2011-04-28 12:58:11 -0700 | [diff] [blame] | 303 | /** |
John Stultz | 7068b7a | 2011-04-28 13:29:18 -0700 | [diff] [blame] | 304 | * alarmtimer_fired - Handles alarm hrtimer being fired. |
| 305 | * @timer: pointer to hrtimer being run |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 306 | * |
John Stultz | 180bf81 | 2011-04-28 12:58:11 -0700 | [diff] [blame] | 307 | * When a alarm timer fires, this runs through the timerqueue to |
| 308 | * see which alarms expired, and runs those. If there are more alarm |
| 309 | * timers queued for the future, we set the hrtimer to fire when |
| 310 | * when the next future alarm timer expires. |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 311 | */ |
John Stultz | 7068b7a | 2011-04-28 13:29:18 -0700 | [diff] [blame] | 312 | static enum hrtimer_restart alarmtimer_fired(struct hrtimer *timer) |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 313 | { |
John Stultz | dae373b | 2012-09-13 19:12:16 -0400 | [diff] [blame] | 314 | struct alarm *alarm = container_of(timer, struct alarm, timer); |
| 315 | struct alarm_base *base = &alarm_bases[alarm->type]; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 316 | unsigned long flags; |
John Stultz | 7068b7a | 2011-04-28 13:29:18 -0700 | [diff] [blame] | 317 | int ret = HRTIMER_NORESTART; |
John Stultz | 54da23b | 2011-08-10 11:08:07 -0700 | [diff] [blame] | 318 | int restart = ALARMTIMER_NORESTART; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 319 | |
| 320 | spin_lock_irqsave(&base->lock, flags); |
John Stultz | a65bcc1 | 2012-09-13 19:25:22 -0400 | [diff] [blame] | 321 | alarmtimer_dequeue(base, alarm); |
John Stultz | dae373b | 2012-09-13 19:12:16 -0400 | [diff] [blame] | 322 | spin_unlock_irqrestore(&base->lock, flags); |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 323 | |
John Stultz | dae373b | 2012-09-13 19:12:16 -0400 | [diff] [blame] | 324 | if (alarm->function) |
| 325 | restart = alarm->function(alarm, base->gettime()); |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 326 | |
John Stultz | dae373b | 2012-09-13 19:12:16 -0400 | [diff] [blame] | 327 | spin_lock_irqsave(&base->lock, flags); |
| 328 | if (restart != ALARMTIMER_NORESTART) { |
| 329 | hrtimer_set_expires(&alarm->timer, alarm->node.expires); |
| 330 | alarmtimer_enqueue(base, alarm); |
John Stultz | 7068b7a | 2011-04-28 13:29:18 -0700 | [diff] [blame] | 331 | ret = HRTIMER_RESTART; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 332 | } |
| 333 | spin_unlock_irqrestore(&base->lock, flags); |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 334 | |
Mao Jinlong | 2e1a4ae | 2016-02-17 15:21:49 +0800 | [diff] [blame^] | 335 | /* set next power off alarm */ |
| 336 | if (alarm->type == ALARM_POWEROFF_REALTIME) |
| 337 | queue_delayed_work(power_off_alarm_workqueue, &work, 0); |
| 338 | |
John Stultz | 7068b7a | 2011-04-28 13:29:18 -0700 | [diff] [blame] | 339 | return ret; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 340 | |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 341 | } |
| 342 | |
Todd Poynor | 6cffe00 | 2013-05-15 14:38:11 -0700 | [diff] [blame] | 343 | ktime_t alarm_expires_remaining(const struct alarm *alarm) |
| 344 | { |
| 345 | struct alarm_base *base = &alarm_bases[alarm->type]; |
| 346 | return ktime_sub(alarm->node.expires, base->gettime()); |
| 347 | } |
Marcus Gelderie | 11682a4 | 2013-06-04 09:32:09 +0200 | [diff] [blame] | 348 | EXPORT_SYMBOL_GPL(alarm_expires_remaining); |
Todd Poynor | 6cffe00 | 2013-05-15 14:38:11 -0700 | [diff] [blame] | 349 | |
John Stultz | 472647d | 2011-04-29 15:03:10 -0700 | [diff] [blame] | 350 | #ifdef CONFIG_RTC_CLASS |
John Stultz | 180bf81 | 2011-04-28 12:58:11 -0700 | [diff] [blame] | 351 | /** |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 352 | * alarmtimer_suspend - Suspend time callback |
| 353 | * @dev: unused |
| 354 | * @state: unused |
| 355 | * |
| 356 | * When we are going into suspend, we look through the bases |
| 357 | * to see which is the soonest timer to expire. We then |
| 358 | * set an rtc timer to fire that far into the future, which |
| 359 | * will wake us from suspend. |
| 360 | */ |
| 361 | static int alarmtimer_suspend(struct device *dev) |
| 362 | { |
| 363 | struct rtc_time tm; |
| 364 | ktime_t min, now; |
| 365 | unsigned long flags; |
John Stultz | c008ba58 | 2011-06-16 18:27:09 -0700 | [diff] [blame] | 366 | struct rtc_device *rtc; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 367 | int i; |
Todd Poynor | 59a93c2 | 2012-08-09 00:37:27 -0700 | [diff] [blame] | 368 | int ret; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 369 | |
Mao Jinlong | 2e1a4ae | 2016-02-17 15:21:49 +0800 | [diff] [blame^] | 370 | cancel_delayed_work_sync(&work); |
| 371 | |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 372 | spin_lock_irqsave(&freezer_delta_lock, flags); |
| 373 | min = freezer_delta; |
| 374 | freezer_delta = ktime_set(0, 0); |
| 375 | spin_unlock_irqrestore(&freezer_delta_lock, flags); |
| 376 | |
John Stultz | 8bc0daf | 2011-07-14 18:35:13 -0700 | [diff] [blame] | 377 | rtc = alarmtimer_get_rtcdev(); |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 378 | /* If we have no rtcdev, just return */ |
John Stultz | c008ba58 | 2011-06-16 18:27:09 -0700 | [diff] [blame] | 379 | if (!rtc) |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 380 | return 0; |
| 381 | |
| 382 | /* Find the soonest timer to expire*/ |
| 383 | for (i = 0; i < ALARM_NUMTYPE; i++) { |
| 384 | struct alarm_base *base = &alarm_bases[i]; |
| 385 | struct timerqueue_node *next; |
| 386 | ktime_t delta; |
| 387 | |
| 388 | spin_lock_irqsave(&base->lock, flags); |
| 389 | next = timerqueue_getnext(&base->timerqueue); |
| 390 | spin_unlock_irqrestore(&base->lock, flags); |
| 391 | if (!next) |
| 392 | continue; |
| 393 | delta = ktime_sub(next->expires, base->gettime()); |
| 394 | if (!min.tv64 || (delta.tv64 < min.tv64)) |
| 395 | min = delta; |
| 396 | } |
| 397 | if (min.tv64 == 0) |
| 398 | return 0; |
| 399 | |
Todd Poynor | 59a93c2 | 2012-08-09 00:37:27 -0700 | [diff] [blame] | 400 | if (ktime_to_ns(min) < 2 * NSEC_PER_SEC) { |
| 401 | __pm_wakeup_event(ws, 2 * MSEC_PER_SEC); |
| 402 | return -EBUSY; |
| 403 | } |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 404 | |
| 405 | /* Setup an rtc timer to fire that far in the future */ |
John Stultz | c008ba58 | 2011-06-16 18:27:09 -0700 | [diff] [blame] | 406 | rtc_timer_cancel(rtc, &rtctimer); |
| 407 | rtc_read_time(rtc, &tm); |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 408 | now = rtc_tm_to_ktime(tm); |
| 409 | now = ktime_add(now, min); |
| 410 | |
Todd Poynor | 59a93c2 | 2012-08-09 00:37:27 -0700 | [diff] [blame] | 411 | /* Set alarm, if in the past reject suspend briefly to handle */ |
| 412 | ret = rtc_timer_start(rtc, &rtctimer, now, ktime_set(0, 0)); |
| 413 | if (ret < 0) |
| 414 | __pm_wakeup_event(ws, MSEC_PER_SEC); |
| 415 | return ret; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 416 | } |
zhuo-hao | a0e3213 | 2015-11-17 20:08:07 +0800 | [diff] [blame] | 417 | |
| 418 | static int alarmtimer_resume(struct device *dev) |
| 419 | { |
| 420 | struct rtc_device *rtc; |
| 421 | |
| 422 | rtc = alarmtimer_get_rtcdev(); |
| 423 | if (rtc) |
| 424 | rtc_timer_cancel(rtc, &rtctimer); |
Mao Jinlong | 2e1a4ae | 2016-02-17 15:21:49 +0800 | [diff] [blame^] | 425 | |
| 426 | queue_delayed_work(power_off_alarm_workqueue, &work, 0); |
zhuo-hao | a0e3213 | 2015-11-17 20:08:07 +0800 | [diff] [blame] | 427 | return 0; |
| 428 | } |
| 429 | |
John Stultz | 472647d | 2011-04-29 15:03:10 -0700 | [diff] [blame] | 430 | #else |
| 431 | static int alarmtimer_suspend(struct device *dev) |
| 432 | { |
| 433 | return 0; |
| 434 | } |
zhuo-hao | a0e3213 | 2015-11-17 20:08:07 +0800 | [diff] [blame] | 435 | |
| 436 | static int alarmtimer_resume(struct device *dev) |
| 437 | { |
| 438 | return 0; |
| 439 | } |
John Stultz | 472647d | 2011-04-29 15:03:10 -0700 | [diff] [blame] | 440 | #endif |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 441 | |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 442 | static void alarmtimer_freezerset(ktime_t absexp, enum alarmtimer_type type) |
| 443 | { |
| 444 | ktime_t delta; |
| 445 | unsigned long flags; |
| 446 | struct alarm_base *base = &alarm_bases[type]; |
| 447 | |
| 448 | delta = ktime_sub(absexp, base->gettime()); |
| 449 | |
| 450 | spin_lock_irqsave(&freezer_delta_lock, flags); |
| 451 | if (!freezer_delta.tv64 || (delta.tv64 < freezer_delta.tv64)) |
| 452 | freezer_delta = delta; |
| 453 | spin_unlock_irqrestore(&freezer_delta_lock, flags); |
| 454 | } |
| 455 | |
| 456 | |
John Stultz | 180bf81 | 2011-04-28 12:58:11 -0700 | [diff] [blame] | 457 | /** |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 458 | * alarm_init - Initialize an alarm structure |
| 459 | * @alarm: ptr to alarm to be initialized |
| 460 | * @type: the type of the alarm |
| 461 | * @function: callback that is run when the alarm fires |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 462 | */ |
| 463 | void alarm_init(struct alarm *alarm, enum alarmtimer_type type, |
John Stultz | 4b41308 | 2011-08-10 10:37:59 -0700 | [diff] [blame] | 464 | enum alarmtimer_restart (*function)(struct alarm *, ktime_t)) |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 465 | { |
| 466 | timerqueue_init(&alarm->node); |
John Stultz | dae373b | 2012-09-13 19:12:16 -0400 | [diff] [blame] | 467 | hrtimer_init(&alarm->timer, alarm_bases[type].base_clockid, |
| 468 | HRTIMER_MODE_ABS); |
| 469 | alarm->timer.function = alarmtimer_fired; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 470 | alarm->function = function; |
| 471 | alarm->type = type; |
John Stultz | a28cde8 | 2011-08-10 12:30:21 -0700 | [diff] [blame] | 472 | alarm->state = ALARMTIMER_STATE_INACTIVE; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 473 | } |
Marcus Gelderie | 11682a4 | 2013-06-04 09:32:09 +0200 | [diff] [blame] | 474 | EXPORT_SYMBOL_GPL(alarm_init); |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 475 | |
John Stultz | 180bf81 | 2011-04-28 12:58:11 -0700 | [diff] [blame] | 476 | /** |
Todd Poynor | 6cffe00 | 2013-05-15 14:38:11 -0700 | [diff] [blame] | 477 | * alarm_start - Sets an absolute alarm to fire |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 478 | * @alarm: ptr to alarm to set |
| 479 | * @start: time to run the alarm |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 480 | */ |
Thomas Gleixner | b193217 | 2015-04-14 21:09:18 +0000 | [diff] [blame] | 481 | void alarm_start(struct alarm *alarm, ktime_t start) |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 482 | { |
| 483 | struct alarm_base *base = &alarm_bases[alarm->type]; |
| 484 | unsigned long flags; |
| 485 | |
| 486 | spin_lock_irqsave(&base->lock, flags); |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 487 | alarm->node.expires = start; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 488 | alarmtimer_enqueue(base, alarm); |
Thomas Gleixner | b193217 | 2015-04-14 21:09:18 +0000 | [diff] [blame] | 489 | hrtimer_start(&alarm->timer, alarm->node.expires, HRTIMER_MODE_ABS); |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 490 | spin_unlock_irqrestore(&base->lock, flags); |
| 491 | } |
Marcus Gelderie | 11682a4 | 2013-06-04 09:32:09 +0200 | [diff] [blame] | 492 | EXPORT_SYMBOL_GPL(alarm_start); |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 493 | |
John Stultz | 180bf81 | 2011-04-28 12:58:11 -0700 | [diff] [blame] | 494 | /** |
Todd Poynor | 6cffe00 | 2013-05-15 14:38:11 -0700 | [diff] [blame] | 495 | * alarm_start_relative - Sets a relative alarm to fire |
| 496 | * @alarm: ptr to alarm to set |
| 497 | * @start: time relative to now to run the alarm |
| 498 | */ |
Thomas Gleixner | b193217 | 2015-04-14 21:09:18 +0000 | [diff] [blame] | 499 | void alarm_start_relative(struct alarm *alarm, ktime_t start) |
Todd Poynor | 6cffe00 | 2013-05-15 14:38:11 -0700 | [diff] [blame] | 500 | { |
| 501 | struct alarm_base *base = &alarm_bases[alarm->type]; |
| 502 | |
| 503 | start = ktime_add(start, base->gettime()); |
Thomas Gleixner | b193217 | 2015-04-14 21:09:18 +0000 | [diff] [blame] | 504 | alarm_start(alarm, start); |
Todd Poynor | 6cffe00 | 2013-05-15 14:38:11 -0700 | [diff] [blame] | 505 | } |
Marcus Gelderie | 11682a4 | 2013-06-04 09:32:09 +0200 | [diff] [blame] | 506 | EXPORT_SYMBOL_GPL(alarm_start_relative); |
Todd Poynor | 6cffe00 | 2013-05-15 14:38:11 -0700 | [diff] [blame] | 507 | |
| 508 | void alarm_restart(struct alarm *alarm) |
| 509 | { |
| 510 | struct alarm_base *base = &alarm_bases[alarm->type]; |
| 511 | unsigned long flags; |
| 512 | |
| 513 | spin_lock_irqsave(&base->lock, flags); |
| 514 | hrtimer_set_expires(&alarm->timer, alarm->node.expires); |
| 515 | hrtimer_restart(&alarm->timer); |
| 516 | alarmtimer_enqueue(base, alarm); |
| 517 | spin_unlock_irqrestore(&base->lock, flags); |
| 518 | } |
Marcus Gelderie | 11682a4 | 2013-06-04 09:32:09 +0200 | [diff] [blame] | 519 | EXPORT_SYMBOL_GPL(alarm_restart); |
Todd Poynor | 6cffe00 | 2013-05-15 14:38:11 -0700 | [diff] [blame] | 520 | |
| 521 | /** |
John Stultz | 9082c46 | 2011-08-10 12:41:36 -0700 | [diff] [blame] | 522 | * alarm_try_to_cancel - Tries to cancel an alarm timer |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 523 | * @alarm: ptr to alarm to be canceled |
John Stultz | 9082c46 | 2011-08-10 12:41:36 -0700 | [diff] [blame] | 524 | * |
| 525 | * Returns 1 if the timer was canceled, 0 if it was not running, |
| 526 | * and -1 if the callback was running |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 527 | */ |
John Stultz | 9082c46 | 2011-08-10 12:41:36 -0700 | [diff] [blame] | 528 | int alarm_try_to_cancel(struct alarm *alarm) |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 529 | { |
| 530 | struct alarm_base *base = &alarm_bases[alarm->type]; |
| 531 | unsigned long flags; |
John Stultz | dae373b | 2012-09-13 19:12:16 -0400 | [diff] [blame] | 532 | int ret; |
| 533 | |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 534 | spin_lock_irqsave(&base->lock, flags); |
John Stultz | dae373b | 2012-09-13 19:12:16 -0400 | [diff] [blame] | 535 | ret = hrtimer_try_to_cancel(&alarm->timer); |
| 536 | if (ret >= 0) |
John Stultz | a65bcc1 | 2012-09-13 19:25:22 -0400 | [diff] [blame] | 537 | alarmtimer_dequeue(base, alarm); |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 538 | spin_unlock_irqrestore(&base->lock, flags); |
John Stultz | 9082c46 | 2011-08-10 12:41:36 -0700 | [diff] [blame] | 539 | return ret; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 540 | } |
Marcus Gelderie | 11682a4 | 2013-06-04 09:32:09 +0200 | [diff] [blame] | 541 | EXPORT_SYMBOL_GPL(alarm_try_to_cancel); |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 542 | |
| 543 | |
John Stultz | 9082c46 | 2011-08-10 12:41:36 -0700 | [diff] [blame] | 544 | /** |
| 545 | * alarm_cancel - Spins trying to cancel an alarm timer until it is done |
| 546 | * @alarm: ptr to alarm to be canceled |
| 547 | * |
| 548 | * Returns 1 if the timer was canceled, 0 if it was not active. |
| 549 | */ |
| 550 | int alarm_cancel(struct alarm *alarm) |
| 551 | { |
| 552 | for (;;) { |
| 553 | int ret = alarm_try_to_cancel(alarm); |
| 554 | if (ret >= 0) |
| 555 | return ret; |
| 556 | cpu_relax(); |
| 557 | } |
| 558 | } |
Marcus Gelderie | 11682a4 | 2013-06-04 09:32:09 +0200 | [diff] [blame] | 559 | EXPORT_SYMBOL_GPL(alarm_cancel); |
John Stultz | 9082c46 | 2011-08-10 12:41:36 -0700 | [diff] [blame] | 560 | |
John Stultz | dce75a8 | 2011-08-10 11:31:03 -0700 | [diff] [blame] | 561 | |
| 562 | u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval) |
| 563 | { |
| 564 | u64 overrun = 1; |
| 565 | ktime_t delta; |
| 566 | |
| 567 | delta = ktime_sub(now, alarm->node.expires); |
| 568 | |
| 569 | if (delta.tv64 < 0) |
| 570 | return 0; |
| 571 | |
| 572 | if (unlikely(delta.tv64 >= interval.tv64)) { |
| 573 | s64 incr = ktime_to_ns(interval); |
| 574 | |
| 575 | overrun = ktime_divns(delta, incr); |
| 576 | |
| 577 | alarm->node.expires = ktime_add_ns(alarm->node.expires, |
| 578 | incr*overrun); |
| 579 | |
| 580 | if (alarm->node.expires.tv64 > now.tv64) |
| 581 | return overrun; |
| 582 | /* |
| 583 | * This (and the ktime_add() below) is the |
| 584 | * correction for exact: |
| 585 | */ |
| 586 | overrun++; |
| 587 | } |
| 588 | |
| 589 | alarm->node.expires = ktime_add(alarm->node.expires, interval); |
| 590 | return overrun; |
| 591 | } |
Marcus Gelderie | 11682a4 | 2013-06-04 09:32:09 +0200 | [diff] [blame] | 592 | EXPORT_SYMBOL_GPL(alarm_forward); |
John Stultz | dce75a8 | 2011-08-10 11:31:03 -0700 | [diff] [blame] | 593 | |
Todd Poynor | 6cffe00 | 2013-05-15 14:38:11 -0700 | [diff] [blame] | 594 | u64 alarm_forward_now(struct alarm *alarm, ktime_t interval) |
| 595 | { |
| 596 | struct alarm_base *base = &alarm_bases[alarm->type]; |
| 597 | |
| 598 | return alarm_forward(alarm, base->gettime(), interval); |
| 599 | } |
Marcus Gelderie | 11682a4 | 2013-06-04 09:32:09 +0200 | [diff] [blame] | 600 | EXPORT_SYMBOL_GPL(alarm_forward_now); |
John Stultz | dce75a8 | 2011-08-10 11:31:03 -0700 | [diff] [blame] | 601 | |
| 602 | |
John Stultz | 180bf81 | 2011-04-28 12:58:11 -0700 | [diff] [blame] | 603 | /** |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 604 | * clock2alarm - helper that converts from clockid to alarmtypes |
| 605 | * @clockid: clockid. |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 606 | */ |
Mao Jinlong | 2e1a4ae | 2016-02-17 15:21:49 +0800 | [diff] [blame^] | 607 | enum alarmtimer_type clock2alarm(clockid_t clockid) |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 608 | { |
| 609 | if (clockid == CLOCK_REALTIME_ALARM) |
| 610 | return ALARM_REALTIME; |
| 611 | if (clockid == CLOCK_BOOTTIME_ALARM) |
| 612 | return ALARM_BOOTTIME; |
Mao Jinlong | 2e1a4ae | 2016-02-17 15:21:49 +0800 | [diff] [blame^] | 613 | if (clockid == CLOCK_POWEROFF_ALARM) |
| 614 | return ALARM_POWEROFF_REALTIME; |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 615 | return -1; |
| 616 | } |
| 617 | |
John Stultz | 180bf81 | 2011-04-28 12:58:11 -0700 | [diff] [blame] | 618 | /** |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 619 | * alarm_handle_timer - Callback for posix timers |
| 620 | * @alarm: alarm that fired |
| 621 | * |
| 622 | * Posix timer callback for expired alarm timers. |
| 623 | */ |
John Stultz | 4b41308 | 2011-08-10 10:37:59 -0700 | [diff] [blame] | 624 | static enum alarmtimer_restart alarm_handle_timer(struct alarm *alarm, |
| 625 | ktime_t now) |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 626 | { |
Richard Larocque | 474e941 | 2014-09-09 18:31:05 -0700 | [diff] [blame] | 627 | unsigned long flags; |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 628 | struct k_itimer *ptr = container_of(alarm, struct k_itimer, |
John Stultz | 9e26476 | 2011-08-10 12:09:24 -0700 | [diff] [blame] | 629 | it.alarm.alarmtimer); |
Richard Larocque | 474e941 | 2014-09-09 18:31:05 -0700 | [diff] [blame] | 630 | enum alarmtimer_restart result = ALARMTIMER_NORESTART; |
| 631 | |
| 632 | spin_lock_irqsave(&ptr->it_lock, flags); |
Richard Larocque | 265b81d | 2014-09-09 18:31:04 -0700 | [diff] [blame] | 633 | if ((ptr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) { |
| 634 | if (posix_timer_event(ptr, 0) != 0) |
| 635 | ptr->it_overrun++; |
| 636 | } |
John Stultz | 4b41308 | 2011-08-10 10:37:59 -0700 | [diff] [blame] | 637 | |
John Stultz | 54da23b | 2011-08-10 11:08:07 -0700 | [diff] [blame] | 638 | /* Re-add periodic timers */ |
John Stultz | 9e26476 | 2011-08-10 12:09:24 -0700 | [diff] [blame] | 639 | if (ptr->it.alarm.interval.tv64) { |
| 640 | ptr->it_overrun += alarm_forward(alarm, now, |
| 641 | ptr->it.alarm.interval); |
Richard Larocque | 474e941 | 2014-09-09 18:31:05 -0700 | [diff] [blame] | 642 | result = ALARMTIMER_RESTART; |
John Stultz | 54da23b | 2011-08-10 11:08:07 -0700 | [diff] [blame] | 643 | } |
Richard Larocque | 474e941 | 2014-09-09 18:31:05 -0700 | [diff] [blame] | 644 | spin_unlock_irqrestore(&ptr->it_lock, flags); |
| 645 | |
| 646 | return result; |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 647 | } |
| 648 | |
John Stultz | 180bf81 | 2011-04-28 12:58:11 -0700 | [diff] [blame] | 649 | /** |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 650 | * alarm_clock_getres - posix getres interface |
| 651 | * @which_clock: clockid |
| 652 | * @tp: timespec to fill |
| 653 | * |
| 654 | * Returns the granularity of underlying alarm base clock |
| 655 | */ |
| 656 | static int alarm_clock_getres(const clockid_t which_clock, struct timespec *tp) |
| 657 | { |
John Stultz | 1c6b39a | 2011-06-16 18:47:37 -0700 | [diff] [blame] | 658 | if (!alarmtimer_get_rtcdev()) |
KOSAKI Motohiro | 98d6f4d | 2013-10-14 17:33:16 -0400 | [diff] [blame] | 659 | return -EINVAL; |
John Stultz | 1c6b39a | 2011-06-16 18:47:37 -0700 | [diff] [blame] | 660 | |
Thomas Gleixner | 056a3ca | 2015-04-14 21:08:32 +0000 | [diff] [blame] | 661 | tp->tv_sec = 0; |
| 662 | tp->tv_nsec = hrtimer_resolution; |
| 663 | return 0; |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 664 | } |
| 665 | |
| 666 | /** |
| 667 | * alarm_clock_get - posix clock_get interface |
| 668 | * @which_clock: clockid |
| 669 | * @tp: timespec to fill. |
| 670 | * |
| 671 | * Provides the underlying alarm base time. |
| 672 | */ |
| 673 | static int alarm_clock_get(clockid_t which_clock, struct timespec *tp) |
| 674 | { |
| 675 | struct alarm_base *base = &alarm_bases[clock2alarm(which_clock)]; |
| 676 | |
John Stultz | 1c6b39a | 2011-06-16 18:47:37 -0700 | [diff] [blame] | 677 | if (!alarmtimer_get_rtcdev()) |
KOSAKI Motohiro | 98d6f4d | 2013-10-14 17:33:16 -0400 | [diff] [blame] | 678 | return -EINVAL; |
John Stultz | 1c6b39a | 2011-06-16 18:47:37 -0700 | [diff] [blame] | 679 | |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 680 | *tp = ktime_to_timespec(base->gettime()); |
| 681 | return 0; |
| 682 | } |
| 683 | |
| 684 | /** |
| 685 | * alarm_timer_create - posix timer_create interface |
| 686 | * @new_timer: k_itimer pointer to manage |
| 687 | * |
| 688 | * Initializes the k_itimer structure. |
| 689 | */ |
| 690 | static int alarm_timer_create(struct k_itimer *new_timer) |
| 691 | { |
| 692 | enum alarmtimer_type type; |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 693 | |
John Stultz | 1c6b39a | 2011-06-16 18:47:37 -0700 | [diff] [blame] | 694 | if (!alarmtimer_get_rtcdev()) |
| 695 | return -ENOTSUPP; |
| 696 | |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 697 | if (!capable(CAP_WAKE_ALARM)) |
| 698 | return -EPERM; |
| 699 | |
| 700 | type = clock2alarm(new_timer->it_clock); |
John Stultz | 9e26476 | 2011-08-10 12:09:24 -0700 | [diff] [blame] | 701 | alarm_init(&new_timer->it.alarm.alarmtimer, type, alarm_handle_timer); |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 702 | return 0; |
| 703 | } |
| 704 | |
| 705 | /** |
| 706 | * alarm_timer_get - posix timer_get interface |
| 707 | * @new_timer: k_itimer pointer |
| 708 | * @cur_setting: itimerspec data to fill |
| 709 | * |
Richard Larocque | e86fea7 | 2014-09-09 18:31:03 -0700 | [diff] [blame] | 710 | * Copies out the current itimerspec data |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 711 | */ |
| 712 | static void alarm_timer_get(struct k_itimer *timr, |
| 713 | struct itimerspec *cur_setting) |
| 714 | { |
Richard Larocque | e86fea7 | 2014-09-09 18:31:03 -0700 | [diff] [blame] | 715 | ktime_t relative_expiry_time = |
| 716 | alarm_expires_remaining(&(timr->it.alarm.alarmtimer)); |
John Stultz | ea7802f | 2011-08-04 07:51:56 -0700 | [diff] [blame] | 717 | |
Richard Larocque | e86fea7 | 2014-09-09 18:31:03 -0700 | [diff] [blame] | 718 | if (ktime_to_ns(relative_expiry_time) > 0) { |
| 719 | cur_setting->it_value = ktime_to_timespec(relative_expiry_time); |
| 720 | } else { |
| 721 | cur_setting->it_value.tv_sec = 0; |
| 722 | cur_setting->it_value.tv_nsec = 0; |
| 723 | } |
| 724 | |
| 725 | cur_setting->it_interval = ktime_to_timespec(timr->it.alarm.interval); |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 726 | } |
| 727 | |
| 728 | /** |
| 729 | * alarm_timer_del - posix timer_del interface |
| 730 | * @timr: k_itimer pointer to be deleted |
| 731 | * |
| 732 | * Cancels any programmed alarms for the given timer. |
| 733 | */ |
| 734 | static int alarm_timer_del(struct k_itimer *timr) |
| 735 | { |
John Stultz | 1c6b39a | 2011-06-16 18:47:37 -0700 | [diff] [blame] | 736 | if (!rtcdev) |
| 737 | return -ENOTSUPP; |
| 738 | |
John Stultz | 9082c46 | 2011-08-10 12:41:36 -0700 | [diff] [blame] | 739 | if (alarm_try_to_cancel(&timr->it.alarm.alarmtimer) < 0) |
| 740 | return TIMER_RETRY; |
| 741 | |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 742 | return 0; |
| 743 | } |
| 744 | |
| 745 | /** |
| 746 | * alarm_timer_set - posix timer_set interface |
| 747 | * @timr: k_itimer pointer to be deleted |
| 748 | * @flags: timer flags |
| 749 | * @new_setting: itimerspec to be used |
| 750 | * @old_setting: itimerspec being replaced |
| 751 | * |
| 752 | * Sets the timer to new_setting, and starts the timer. |
| 753 | */ |
| 754 | static int alarm_timer_set(struct k_itimer *timr, int flags, |
| 755 | struct itimerspec *new_setting, |
| 756 | struct itimerspec *old_setting) |
| 757 | { |
John Stultz | 1692777 | 2014-07-07 14:06:11 -0700 | [diff] [blame] | 758 | ktime_t exp; |
| 759 | |
John Stultz | 1c6b39a | 2011-06-16 18:47:37 -0700 | [diff] [blame] | 760 | if (!rtcdev) |
| 761 | return -ENOTSUPP; |
| 762 | |
John Stultz | 1692777 | 2014-07-07 14:06:11 -0700 | [diff] [blame] | 763 | if (flags & ~TIMER_ABSTIME) |
| 764 | return -EINVAL; |
| 765 | |
John Stultz | 971c90b | 2011-08-04 07:25:35 -0700 | [diff] [blame] | 766 | if (old_setting) |
| 767 | alarm_timer_get(timr, old_setting); |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 768 | |
| 769 | /* If the timer was already set, cancel it */ |
John Stultz | 9082c46 | 2011-08-10 12:41:36 -0700 | [diff] [blame] | 770 | if (alarm_try_to_cancel(&timr->it.alarm.alarmtimer) < 0) |
| 771 | return TIMER_RETRY; |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 772 | |
| 773 | /* start the timer */ |
John Stultz | 9e26476 | 2011-08-10 12:09:24 -0700 | [diff] [blame] | 774 | timr->it.alarm.interval = timespec_to_ktime(new_setting->it_interval); |
John Stultz | 1692777 | 2014-07-07 14:06:11 -0700 | [diff] [blame] | 775 | exp = timespec_to_ktime(new_setting->it_value); |
| 776 | /* Convert (if necessary) to absolute time */ |
| 777 | if (flags != TIMER_ABSTIME) { |
| 778 | ktime_t now; |
| 779 | |
| 780 | now = alarm_bases[timr->it.alarm.alarmtimer.type].gettime(); |
| 781 | exp = ktime_add(now, exp); |
| 782 | } |
| 783 | |
| 784 | alarm_start(&timr->it.alarm.alarmtimer, exp); |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 785 | return 0; |
| 786 | } |
| 787 | |
| 788 | /** |
| 789 | * alarmtimer_nsleep_wakeup - Wakeup function for alarm_timer_nsleep |
| 790 | * @alarm: ptr to alarm that fired |
| 791 | * |
| 792 | * Wakes up the task that set the alarmtimer |
| 793 | */ |
John Stultz | 4b41308 | 2011-08-10 10:37:59 -0700 | [diff] [blame] | 794 | static enum alarmtimer_restart alarmtimer_nsleep_wakeup(struct alarm *alarm, |
| 795 | ktime_t now) |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 796 | { |
| 797 | struct task_struct *task = (struct task_struct *)alarm->data; |
| 798 | |
| 799 | alarm->data = NULL; |
| 800 | if (task) |
| 801 | wake_up_process(task); |
John Stultz | 4b41308 | 2011-08-10 10:37:59 -0700 | [diff] [blame] | 802 | return ALARMTIMER_NORESTART; |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 803 | } |
| 804 | |
| 805 | /** |
| 806 | * alarmtimer_do_nsleep - Internal alarmtimer nsleep implementation |
| 807 | * @alarm: ptr to alarmtimer |
| 808 | * @absexp: absolute expiration time |
| 809 | * |
| 810 | * Sets the alarm timer and sleeps until it is fired or interrupted. |
| 811 | */ |
| 812 | static int alarmtimer_do_nsleep(struct alarm *alarm, ktime_t absexp) |
| 813 | { |
| 814 | alarm->data = (void *)current; |
| 815 | do { |
| 816 | set_current_state(TASK_INTERRUPTIBLE); |
John Stultz | 9e26476 | 2011-08-10 12:09:24 -0700 | [diff] [blame] | 817 | alarm_start(alarm, absexp); |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 818 | if (likely(alarm->data)) |
| 819 | schedule(); |
| 820 | |
| 821 | alarm_cancel(alarm); |
| 822 | } while (alarm->data && !signal_pending(current)); |
| 823 | |
| 824 | __set_current_state(TASK_RUNNING); |
| 825 | |
| 826 | return (alarm->data == NULL); |
| 827 | } |
| 828 | |
| 829 | |
| 830 | /** |
| 831 | * update_rmtp - Update remaining timespec value |
| 832 | * @exp: expiration time |
| 833 | * @type: timer type |
| 834 | * @rmtp: user pointer to remaining timepsec value |
| 835 | * |
| 836 | * Helper function that fills in rmtp value with time between |
| 837 | * now and the exp value |
| 838 | */ |
| 839 | static int update_rmtp(ktime_t exp, enum alarmtimer_type type, |
| 840 | struct timespec __user *rmtp) |
| 841 | { |
| 842 | struct timespec rmt; |
| 843 | ktime_t rem; |
| 844 | |
| 845 | rem = ktime_sub(exp, alarm_bases[type].gettime()); |
| 846 | |
| 847 | if (rem.tv64 <= 0) |
| 848 | return 0; |
| 849 | rmt = ktime_to_timespec(rem); |
| 850 | |
| 851 | if (copy_to_user(rmtp, &rmt, sizeof(*rmtp))) |
| 852 | return -EFAULT; |
| 853 | |
| 854 | return 1; |
| 855 | |
| 856 | } |
| 857 | |
| 858 | /** |
| 859 | * alarm_timer_nsleep_restart - restartblock alarmtimer nsleep |
| 860 | * @restart: ptr to restart block |
| 861 | * |
| 862 | * Handles restarted clock_nanosleep calls |
| 863 | */ |
| 864 | static long __sched alarm_timer_nsleep_restart(struct restart_block *restart) |
| 865 | { |
Thomas Gleixner | ab8177b | 2011-05-20 13:05:15 +0200 | [diff] [blame] | 866 | enum alarmtimer_type type = restart->nanosleep.clockid; |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 867 | ktime_t exp; |
| 868 | struct timespec __user *rmtp; |
| 869 | struct alarm alarm; |
| 870 | int ret = 0; |
| 871 | |
| 872 | exp.tv64 = restart->nanosleep.expires; |
| 873 | alarm_init(&alarm, type, alarmtimer_nsleep_wakeup); |
| 874 | |
| 875 | if (alarmtimer_do_nsleep(&alarm, exp)) |
| 876 | goto out; |
| 877 | |
| 878 | if (freezing(current)) |
| 879 | alarmtimer_freezerset(exp, type); |
| 880 | |
| 881 | rmtp = restart->nanosleep.rmtp; |
| 882 | if (rmtp) { |
| 883 | ret = update_rmtp(exp, type, rmtp); |
| 884 | if (ret <= 0) |
| 885 | goto out; |
| 886 | } |
| 887 | |
| 888 | |
| 889 | /* The other values in restart are already filled in */ |
| 890 | ret = -ERESTART_RESTARTBLOCK; |
| 891 | out: |
| 892 | return ret; |
| 893 | } |
| 894 | |
| 895 | /** |
| 896 | * alarm_timer_nsleep - alarmtimer nanosleep |
| 897 | * @which_clock: clockid |
| 898 | * @flags: determins abstime or relative |
| 899 | * @tsreq: requested sleep time (abs or rel) |
| 900 | * @rmtp: remaining sleep time saved |
| 901 | * |
| 902 | * Handles clock_nanosleep calls against _ALARM clockids |
| 903 | */ |
| 904 | static int alarm_timer_nsleep(const clockid_t which_clock, int flags, |
| 905 | struct timespec *tsreq, struct timespec __user *rmtp) |
| 906 | { |
| 907 | enum alarmtimer_type type = clock2alarm(which_clock); |
| 908 | struct alarm alarm; |
| 909 | ktime_t exp; |
| 910 | int ret = 0; |
| 911 | struct restart_block *restart; |
| 912 | |
John Stultz | 1c6b39a | 2011-06-16 18:47:37 -0700 | [diff] [blame] | 913 | if (!alarmtimer_get_rtcdev()) |
| 914 | return -ENOTSUPP; |
| 915 | |
John Stultz | 1692777 | 2014-07-07 14:06:11 -0700 | [diff] [blame] | 916 | if (flags & ~TIMER_ABSTIME) |
| 917 | return -EINVAL; |
| 918 | |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 919 | if (!capable(CAP_WAKE_ALARM)) |
| 920 | return -EPERM; |
| 921 | |
| 922 | alarm_init(&alarm, type, alarmtimer_nsleep_wakeup); |
| 923 | |
| 924 | exp = timespec_to_ktime(*tsreq); |
| 925 | /* Convert (if necessary) to absolute time */ |
| 926 | if (flags != TIMER_ABSTIME) { |
| 927 | ktime_t now = alarm_bases[type].gettime(); |
| 928 | exp = ktime_add(now, exp); |
| 929 | } |
| 930 | |
| 931 | if (alarmtimer_do_nsleep(&alarm, exp)) |
| 932 | goto out; |
| 933 | |
| 934 | if (freezing(current)) |
| 935 | alarmtimer_freezerset(exp, type); |
| 936 | |
| 937 | /* abs timers don't set remaining time or restart */ |
| 938 | if (flags == TIMER_ABSTIME) { |
| 939 | ret = -ERESTARTNOHAND; |
| 940 | goto out; |
| 941 | } |
| 942 | |
| 943 | if (rmtp) { |
| 944 | ret = update_rmtp(exp, type, rmtp); |
| 945 | if (ret <= 0) |
| 946 | goto out; |
| 947 | } |
| 948 | |
Andy Lutomirski | f56141e | 2015-02-12 15:01:14 -0800 | [diff] [blame] | 949 | restart = ¤t->restart_block; |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 950 | restart->fn = alarm_timer_nsleep_restart; |
Thomas Gleixner | ab8177b | 2011-05-20 13:05:15 +0200 | [diff] [blame] | 951 | restart->nanosleep.clockid = type; |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 952 | restart->nanosleep.expires = exp.tv64; |
| 953 | restart->nanosleep.rmtp = rmtp; |
| 954 | ret = -ERESTART_RESTARTBLOCK; |
| 955 | |
| 956 | out: |
| 957 | return ret; |
| 958 | } |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 959 | |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 960 | |
| 961 | /* Suspend hook structures */ |
| 962 | static const struct dev_pm_ops alarmtimer_pm_ops = { |
| 963 | .suspend = alarmtimer_suspend, |
zhuo-hao | a0e3213 | 2015-11-17 20:08:07 +0800 | [diff] [blame] | 964 | .resume = alarmtimer_resume, |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 965 | }; |
| 966 | |
| 967 | static struct platform_driver alarmtimer_driver = { |
| 968 | .driver = { |
| 969 | .name = "alarmtimer", |
| 970 | .pm = &alarmtimer_pm_ops, |
| 971 | } |
| 972 | }; |
| 973 | |
| 974 | /** |
| 975 | * alarmtimer_init - Initialize alarm timer code |
| 976 | * |
| 977 | * This function initializes the alarm bases and registers |
| 978 | * the posix clock ids. |
| 979 | */ |
| 980 | static int __init alarmtimer_init(void) |
| 981 | { |
Thomas Gleixner | 4523f6a | 2011-09-14 10:54:29 +0200 | [diff] [blame] | 982 | struct platform_device *pdev; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 983 | int error = 0; |
| 984 | int i; |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 985 | struct k_clock alarm_clock = { |
| 986 | .clock_getres = alarm_clock_getres, |
| 987 | .clock_get = alarm_clock_get, |
| 988 | .timer_create = alarm_timer_create, |
| 989 | .timer_set = alarm_timer_set, |
| 990 | .timer_del = alarm_timer_del, |
| 991 | .timer_get = alarm_timer_get, |
| 992 | .nsleep = alarm_timer_nsleep, |
| 993 | }; |
| 994 | |
Thomas Gleixner | c5e14e7 | 2012-03-24 12:46:23 +0100 | [diff] [blame] | 995 | alarmtimer_rtc_timer_init(); |
John Stultz | ad30dfa | 2012-03-23 15:52:25 -0700 | [diff] [blame] | 996 | |
John Stultz | 9a7adcf | 2011-01-11 09:54:33 -0800 | [diff] [blame] | 997 | posix_timers_register_clock(CLOCK_REALTIME_ALARM, &alarm_clock); |
| 998 | posix_timers_register_clock(CLOCK_BOOTTIME_ALARM, &alarm_clock); |
Mao Jinlong | 2e1a4ae | 2016-02-17 15:21:49 +0800 | [diff] [blame^] | 999 | posix_timers_register_clock(CLOCK_POWEROFF_ALARM, &alarm_clock); |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 1000 | |
| 1001 | /* Initialize alarm bases */ |
| 1002 | alarm_bases[ALARM_REALTIME].base_clockid = CLOCK_REALTIME; |
| 1003 | alarm_bases[ALARM_REALTIME].gettime = &ktime_get_real; |
Mao Jinlong | 2e1a4ae | 2016-02-17 15:21:49 +0800 | [diff] [blame^] | 1004 | alarm_bases[ALARM_POWEROFF_REALTIME].base_clockid = CLOCK_REALTIME; |
| 1005 | alarm_bases[ALARM_POWEROFF_REALTIME].gettime = &ktime_get_real; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 1006 | alarm_bases[ALARM_BOOTTIME].base_clockid = CLOCK_BOOTTIME; |
| 1007 | alarm_bases[ALARM_BOOTTIME].gettime = &ktime_get_boottime; |
| 1008 | for (i = 0; i < ALARM_NUMTYPE; i++) { |
| 1009 | timerqueue_init_head(&alarm_bases[i].timerqueue); |
| 1010 | spin_lock_init(&alarm_bases[i].lock); |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 1011 | } |
John Stultz | 8bc0daf | 2011-07-14 18:35:13 -0700 | [diff] [blame] | 1012 | |
Thomas Gleixner | 4523f6a | 2011-09-14 10:54:29 +0200 | [diff] [blame] | 1013 | error = alarmtimer_rtc_interface_setup(); |
| 1014 | if (error) |
| 1015 | return error; |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 1016 | |
Thomas Gleixner | 4523f6a | 2011-09-14 10:54:29 +0200 | [diff] [blame] | 1017 | error = platform_driver_register(&alarmtimer_driver); |
| 1018 | if (error) |
| 1019 | goto out_if; |
| 1020 | |
| 1021 | pdev = platform_device_register_simple("alarmtimer", -1, NULL, 0); |
| 1022 | if (IS_ERR(pdev)) { |
| 1023 | error = PTR_ERR(pdev); |
| 1024 | goto out_drv; |
| 1025 | } |
Todd Poynor | 59a93c2 | 2012-08-09 00:37:27 -0700 | [diff] [blame] | 1026 | ws = wakeup_source_register("alarmtimer"); |
Mao Jinlong | 2e1a4ae | 2016-02-17 15:21:49 +0800 | [diff] [blame^] | 1027 | if (!ws) { |
| 1028 | error = -ENOMEM; |
| 1029 | goto out_ws; |
| 1030 | } |
Thomas Gleixner | 4523f6a | 2011-09-14 10:54:29 +0200 | [diff] [blame] | 1031 | |
Mao Jinlong | 2e1a4ae | 2016-02-17 15:21:49 +0800 | [diff] [blame^] | 1032 | INIT_DELAYED_WORK(&work, alarm_work_func); |
| 1033 | power_off_alarm_workqueue = |
| 1034 | create_singlethread_workqueue("power_off_alarm"); |
| 1035 | if (!power_off_alarm_workqueue) { |
| 1036 | error = -ENOMEM; |
| 1037 | goto out_wq; |
| 1038 | } |
| 1039 | |
| 1040 | return 0; |
| 1041 | out_wq: |
| 1042 | wakeup_source_unregister(ws); |
| 1043 | out_ws: |
| 1044 | platform_device_unregister(pdev); |
Thomas Gleixner | 4523f6a | 2011-09-14 10:54:29 +0200 | [diff] [blame] | 1045 | out_drv: |
| 1046 | platform_driver_unregister(&alarmtimer_driver); |
| 1047 | out_if: |
| 1048 | alarmtimer_rtc_interface_remove(); |
John Stultz | ff3ead9 | 2011-01-11 09:42:13 -0800 | [diff] [blame] | 1049 | return error; |
| 1050 | } |
| 1051 | device_initcall(alarmtimer_init); |