Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/base/power/main.c - Where the driver meets power management. |
| 3 | * |
| 4 | * Copyright (c) 2003 Patrick Mochel |
| 5 | * Copyright (c) 2003 Open Source Development Lab |
| 6 | * |
| 7 | * This file is released under the GPLv2 |
| 8 | * |
| 9 | * |
| 10 | * The driver model core calls device_pm_add() when a device is registered. |
| 11 | * This will intialize the embedded device_pm_info object in the device |
| 12 | * and add it to the list of power-controlled devices. sysfs entries for |
| 13 | * controlling device power management will also be added. |
| 14 | * |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 15 | * A separate list is used for keeping track of power info, because the power |
| 16 | * domain dependencies may differ from the ancestral dependencies that the |
| 17 | * subsystem list maintains. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | */ |
| 19 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/device.h> |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 21 | #include <linux/kallsyms.h> |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 22 | #include <linux/mutex.h> |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 23 | #include <linux/pm.h> |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 24 | #include <linux/pm_runtime.h> |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 25 | #include <linux/resume-trace.h> |
Rafael J. Wysocki | 2ed8d2b | 2009-03-16 22:34:06 +0100 | [diff] [blame] | 26 | #include <linux/interrupt.h> |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame] | 27 | #include <linux/sched.h> |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 28 | #include <linux/async.h> |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 29 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 30 | #include "../base.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include "power.h" |
| 32 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 33 | /* |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 34 | * The entries in the dpm_list list are in a depth first order, simply |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 35 | * because children are guaranteed to be discovered after parents, and |
| 36 | * are inserted at the back of the list on discovery. |
| 37 | * |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 38 | * Since device_pm_add() may be called with a device lock held, |
| 39 | * we must never try to acquire a device lock while holding |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 40 | * dpm_list_mutex. |
| 41 | */ |
| 42 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 43 | LIST_HEAD(dpm_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 45 | static DEFINE_MUTEX(dpm_list_mtx); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 46 | static pm_message_t pm_transition; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 48 | /* |
| 49 | * Set once the preparation of devices for a PM transition has started, reset |
| 50 | * before starting to resume devices. Protected by dpm_list_mtx. |
| 51 | */ |
| 52 | static bool transition_started; |
| 53 | |
| 54 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 55 | * device_pm_init - Initialize the PM-related part of a device object. |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 56 | * @dev: Device object being initialized. |
| 57 | */ |
| 58 | void device_pm_init(struct device *dev) |
| 59 | { |
| 60 | dev->power.status = DPM_ON; |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 61 | init_completion(&dev->power.completion); |
Rafael J. Wysocki | c125e96 | 2010-07-05 22:43:53 +0200 | [diff] [blame^] | 62 | dev->power.wakeup_count = 0; |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 63 | pm_runtime_init(dev); |
| 64 | } |
| 65 | |
| 66 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 67 | * device_pm_lock - Lock the list of active devices used by the PM core. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 68 | */ |
| 69 | void device_pm_lock(void) |
| 70 | { |
| 71 | mutex_lock(&dpm_list_mtx); |
| 72 | } |
| 73 | |
| 74 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 75 | * device_pm_unlock - Unlock the list of active devices used by the PM core. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 76 | */ |
| 77 | void device_pm_unlock(void) |
| 78 | { |
| 79 | mutex_unlock(&dpm_list_mtx); |
| 80 | } |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 81 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 82 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 83 | * device_pm_add - Add a device to the PM core's list of active devices. |
| 84 | * @dev: Device to add to the list. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 85 | */ |
Alan Stern | 3b98aea | 2008-08-07 13:06:12 -0400 | [diff] [blame] | 86 | void device_pm_add(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | pr_debug("PM: Adding info for %s:%s\n", |
Dmitry Torokhov | c48ea60 | 2007-04-11 01:37:18 -0400 | [diff] [blame] | 89 | dev->bus ? dev->bus->name : "No Bus", |
| 90 | kobject_name(&dev->kobj)); |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 91 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 92 | if (dev->parent) { |
Rafael J. Wysocki | f5a6d95 | 2008-08-09 01:05:13 +0200 | [diff] [blame] | 93 | if (dev->parent->power.status >= DPM_SUSPENDING) |
| 94 | dev_warn(dev, "parent %s should not be sleeping\n", |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 95 | dev_name(dev->parent)); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 96 | } else if (transition_started) { |
| 97 | /* |
| 98 | * We refuse to register parentless devices while a PM |
| 99 | * transition is in progress in order to avoid leaving them |
| 100 | * unhandled down the road |
| 101 | */ |
Arjan van de Ven | 728f089 | 2008-09-20 19:09:00 -0700 | [diff] [blame] | 102 | dev_WARN(dev, "Parentless device registered during a PM transaction\n"); |
Rafael J. Wysocki | 58aca23 | 2008-03-12 00:57:22 +0100 | [diff] [blame] | 103 | } |
Alan Stern | 3b98aea | 2008-08-07 13:06:12 -0400 | [diff] [blame] | 104 | |
| 105 | list_add_tail(&dev->power.entry, &dpm_list); |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 106 | mutex_unlock(&dpm_list_mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | } |
| 108 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 109 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 110 | * device_pm_remove - Remove a device from the PM core's list of active devices. |
| 111 | * @dev: Device to be removed from the list. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 112 | */ |
Rafael J. Wysocki | 9cddad7 | 2007-06-13 15:53:34 +0200 | [diff] [blame] | 113 | void device_pm_remove(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | { |
| 115 | pr_debug("PM: Removing info for %s:%s\n", |
Dmitry Torokhov | c48ea60 | 2007-04-11 01:37:18 -0400 | [diff] [blame] | 116 | dev->bus ? dev->bus->name : "No Bus", |
| 117 | kobject_name(&dev->kobj)); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 118 | complete_all(&dev->power.completion); |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 119 | mutex_lock(&dpm_list_mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | list_del_init(&dev->power.entry); |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 121 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 122 | pm_runtime_remove(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 123 | } |
| 124 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 125 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 126 | * device_pm_move_before - Move device in the PM core's list of active devices. |
| 127 | * @deva: Device to move in dpm_list. |
| 128 | * @devb: Device @deva should come before. |
Cornelia Huck | ffa6a70 | 2009-03-04 12:44:00 +0100 | [diff] [blame] | 129 | */ |
| 130 | void device_pm_move_before(struct device *deva, struct device *devb) |
| 131 | { |
| 132 | pr_debug("PM: Moving %s:%s before %s:%s\n", |
| 133 | deva->bus ? deva->bus->name : "No Bus", |
| 134 | kobject_name(&deva->kobj), |
| 135 | devb->bus ? devb->bus->name : "No Bus", |
| 136 | kobject_name(&devb->kobj)); |
| 137 | /* Delete deva from dpm_list and reinsert before devb. */ |
| 138 | list_move_tail(&deva->power.entry, &devb->power.entry); |
| 139 | } |
| 140 | |
| 141 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 142 | * device_pm_move_after - Move device in the PM core's list of active devices. |
| 143 | * @deva: Device to move in dpm_list. |
| 144 | * @devb: Device @deva should come after. |
Cornelia Huck | ffa6a70 | 2009-03-04 12:44:00 +0100 | [diff] [blame] | 145 | */ |
| 146 | void device_pm_move_after(struct device *deva, struct device *devb) |
| 147 | { |
| 148 | pr_debug("PM: Moving %s:%s after %s:%s\n", |
| 149 | deva->bus ? deva->bus->name : "No Bus", |
| 150 | kobject_name(&deva->kobj), |
| 151 | devb->bus ? devb->bus->name : "No Bus", |
| 152 | kobject_name(&devb->kobj)); |
| 153 | /* Delete deva from dpm_list and reinsert after devb. */ |
| 154 | list_move(&deva->power.entry, &devb->power.entry); |
| 155 | } |
| 156 | |
| 157 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 158 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
| 159 | * @dev: Device to move in dpm_list. |
Cornelia Huck | ffa6a70 | 2009-03-04 12:44:00 +0100 | [diff] [blame] | 160 | */ |
| 161 | void device_pm_move_last(struct device *dev) |
| 162 | { |
| 163 | pr_debug("PM: Moving %s:%s to end of list\n", |
| 164 | dev->bus ? dev->bus->name : "No Bus", |
| 165 | kobject_name(&dev->kobj)); |
| 166 | list_move_tail(&dev->power.entry, &dpm_list); |
| 167 | } |
| 168 | |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 169 | static ktime_t initcall_debug_start(struct device *dev) |
| 170 | { |
| 171 | ktime_t calltime = ktime_set(0, 0); |
| 172 | |
| 173 | if (initcall_debug) { |
| 174 | pr_info("calling %s+ @ %i\n", |
| 175 | dev_name(dev), task_pid_nr(current)); |
| 176 | calltime = ktime_get(); |
| 177 | } |
| 178 | |
| 179 | return calltime; |
| 180 | } |
| 181 | |
| 182 | static void initcall_debug_report(struct device *dev, ktime_t calltime, |
| 183 | int error) |
| 184 | { |
| 185 | ktime_t delta, rettime; |
| 186 | |
| 187 | if (initcall_debug) { |
| 188 | rettime = ktime_get(); |
| 189 | delta = ktime_sub(rettime, calltime); |
| 190 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), |
| 191 | error, (unsigned long long)ktime_to_ns(delta) >> 10); |
| 192 | } |
| 193 | } |
| 194 | |
Cornelia Huck | ffa6a70 | 2009-03-04 12:44:00 +0100 | [diff] [blame] | 195 | /** |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 196 | * dpm_wait - Wait for a PM operation to complete. |
| 197 | * @dev: Device to wait for. |
| 198 | * @async: If unset, wait only if the device's power.async_suspend flag is set. |
| 199 | */ |
| 200 | static void dpm_wait(struct device *dev, bool async) |
| 201 | { |
| 202 | if (!dev) |
| 203 | return; |
| 204 | |
Rafael J. Wysocki | 0e06b4a | 2010-01-23 22:25:15 +0100 | [diff] [blame] | 205 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 206 | wait_for_completion(&dev->power.completion); |
| 207 | } |
| 208 | |
| 209 | static int dpm_wait_fn(struct device *dev, void *async_ptr) |
| 210 | { |
| 211 | dpm_wait(dev, *((bool *)async_ptr)); |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | static void dpm_wait_for_children(struct device *dev, bool async) |
| 216 | { |
| 217 | device_for_each_child(dev, &async, dpm_wait_fn); |
| 218 | } |
| 219 | |
| 220 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 221 | * pm_op - Execute the PM operation appropriate for given PM event. |
| 222 | * @dev: Device to handle. |
| 223 | * @ops: PM operations to choose from. |
| 224 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 225 | */ |
Dmitry Torokhov | d9ab771 | 2009-07-22 00:37:25 +0200 | [diff] [blame] | 226 | static int pm_op(struct device *dev, |
| 227 | const struct dev_pm_ops *ops, |
| 228 | pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 229 | { |
| 230 | int error = 0; |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 231 | ktime_t calltime; |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame] | 232 | |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 233 | calltime = initcall_debug_start(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 234 | |
| 235 | switch (state.event) { |
| 236 | #ifdef CONFIG_SUSPEND |
| 237 | case PM_EVENT_SUSPEND: |
| 238 | if (ops->suspend) { |
| 239 | error = ops->suspend(dev); |
| 240 | suspend_report_result(ops->suspend, error); |
| 241 | } |
| 242 | break; |
| 243 | case PM_EVENT_RESUME: |
| 244 | if (ops->resume) { |
| 245 | error = ops->resume(dev); |
| 246 | suspend_report_result(ops->resume, error); |
| 247 | } |
| 248 | break; |
| 249 | #endif /* CONFIG_SUSPEND */ |
| 250 | #ifdef CONFIG_HIBERNATION |
| 251 | case PM_EVENT_FREEZE: |
| 252 | case PM_EVENT_QUIESCE: |
| 253 | if (ops->freeze) { |
| 254 | error = ops->freeze(dev); |
| 255 | suspend_report_result(ops->freeze, error); |
| 256 | } |
| 257 | break; |
| 258 | case PM_EVENT_HIBERNATE: |
| 259 | if (ops->poweroff) { |
| 260 | error = ops->poweroff(dev); |
| 261 | suspend_report_result(ops->poweroff, error); |
| 262 | } |
| 263 | break; |
| 264 | case PM_EVENT_THAW: |
| 265 | case PM_EVENT_RECOVER: |
| 266 | if (ops->thaw) { |
| 267 | error = ops->thaw(dev); |
| 268 | suspend_report_result(ops->thaw, error); |
| 269 | } |
| 270 | break; |
| 271 | case PM_EVENT_RESTORE: |
| 272 | if (ops->restore) { |
| 273 | error = ops->restore(dev); |
| 274 | suspend_report_result(ops->restore, error); |
| 275 | } |
| 276 | break; |
| 277 | #endif /* CONFIG_HIBERNATION */ |
| 278 | default: |
| 279 | error = -EINVAL; |
| 280 | } |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame] | 281 | |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 282 | initcall_debug_report(dev, calltime, error); |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame] | 283 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 284 | return error; |
| 285 | } |
| 286 | |
| 287 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 288 | * pm_noirq_op - Execute the PM operation appropriate for given PM event. |
| 289 | * @dev: Device to handle. |
| 290 | * @ops: PM operations to choose from. |
| 291 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 292 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 293 | * The driver of @dev will not receive interrupts while this function is being |
| 294 | * executed. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 295 | */ |
Dmitry Torokhov | d9ab771 | 2009-07-22 00:37:25 +0200 | [diff] [blame] | 296 | static int pm_noirq_op(struct device *dev, |
| 297 | const struct dev_pm_ops *ops, |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 298 | pm_message_t state) |
| 299 | { |
| 300 | int error = 0; |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame] | 301 | ktime_t calltime, delta, rettime; |
| 302 | |
| 303 | if (initcall_debug) { |
Rafael J. Wysocki | 8cc6b39 | 2010-01-23 22:03:29 +0100 | [diff] [blame] | 304 | pr_info("calling %s+ @ %i, parent: %s\n", |
| 305 | dev_name(dev), task_pid_nr(current), |
| 306 | dev->parent ? dev_name(dev->parent) : "none"); |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame] | 307 | calltime = ktime_get(); |
| 308 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 309 | |
| 310 | switch (state.event) { |
| 311 | #ifdef CONFIG_SUSPEND |
| 312 | case PM_EVENT_SUSPEND: |
| 313 | if (ops->suspend_noirq) { |
| 314 | error = ops->suspend_noirq(dev); |
| 315 | suspend_report_result(ops->suspend_noirq, error); |
| 316 | } |
| 317 | break; |
| 318 | case PM_EVENT_RESUME: |
| 319 | if (ops->resume_noirq) { |
| 320 | error = ops->resume_noirq(dev); |
| 321 | suspend_report_result(ops->resume_noirq, error); |
| 322 | } |
| 323 | break; |
| 324 | #endif /* CONFIG_SUSPEND */ |
| 325 | #ifdef CONFIG_HIBERNATION |
| 326 | case PM_EVENT_FREEZE: |
| 327 | case PM_EVENT_QUIESCE: |
| 328 | if (ops->freeze_noirq) { |
| 329 | error = ops->freeze_noirq(dev); |
| 330 | suspend_report_result(ops->freeze_noirq, error); |
| 331 | } |
| 332 | break; |
| 333 | case PM_EVENT_HIBERNATE: |
| 334 | if (ops->poweroff_noirq) { |
| 335 | error = ops->poweroff_noirq(dev); |
| 336 | suspend_report_result(ops->poweroff_noirq, error); |
| 337 | } |
| 338 | break; |
| 339 | case PM_EVENT_THAW: |
| 340 | case PM_EVENT_RECOVER: |
| 341 | if (ops->thaw_noirq) { |
| 342 | error = ops->thaw_noirq(dev); |
| 343 | suspend_report_result(ops->thaw_noirq, error); |
| 344 | } |
| 345 | break; |
| 346 | case PM_EVENT_RESTORE: |
| 347 | if (ops->restore_noirq) { |
| 348 | error = ops->restore_noirq(dev); |
| 349 | suspend_report_result(ops->restore_noirq, error); |
| 350 | } |
| 351 | break; |
| 352 | #endif /* CONFIG_HIBERNATION */ |
| 353 | default: |
| 354 | error = -EINVAL; |
| 355 | } |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame] | 356 | |
| 357 | if (initcall_debug) { |
| 358 | rettime = ktime_get(); |
| 359 | delta = ktime_sub(rettime, calltime); |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 360 | printk("initcall %s_i+ returned %d after %Ld usecs\n", |
| 361 | dev_name(dev), error, |
| 362 | (unsigned long long)ktime_to_ns(delta) >> 10); |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame] | 363 | } |
| 364 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 365 | return error; |
| 366 | } |
| 367 | |
| 368 | static char *pm_verb(int event) |
| 369 | { |
| 370 | switch (event) { |
| 371 | case PM_EVENT_SUSPEND: |
| 372 | return "suspend"; |
| 373 | case PM_EVENT_RESUME: |
| 374 | return "resume"; |
| 375 | case PM_EVENT_FREEZE: |
| 376 | return "freeze"; |
| 377 | case PM_EVENT_QUIESCE: |
| 378 | return "quiesce"; |
| 379 | case PM_EVENT_HIBERNATE: |
| 380 | return "hibernate"; |
| 381 | case PM_EVENT_THAW: |
| 382 | return "thaw"; |
| 383 | case PM_EVENT_RESTORE: |
| 384 | return "restore"; |
| 385 | case PM_EVENT_RECOVER: |
| 386 | return "recover"; |
| 387 | default: |
| 388 | return "(unknown PM event)"; |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) |
| 393 | { |
| 394 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), |
| 395 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? |
| 396 | ", may wakeup" : ""); |
| 397 | } |
| 398 | |
| 399 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, |
| 400 | int error) |
| 401 | { |
| 402 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", |
| 403 | kobject_name(&dev->kobj), pm_verb(state.event), info, error); |
| 404 | } |
| 405 | |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 406 | static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) |
| 407 | { |
| 408 | ktime_t calltime; |
| 409 | s64 usecs64; |
| 410 | int usecs; |
| 411 | |
| 412 | calltime = ktime_get(); |
| 413 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); |
| 414 | do_div(usecs64, NSEC_PER_USEC); |
| 415 | usecs = usecs64; |
| 416 | if (usecs == 0) |
| 417 | usecs = 1; |
| 418 | pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n", |
| 419 | info ?: "", info ? " " : "", pm_verb(state.event), |
| 420 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); |
| 421 | } |
| 422 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 423 | /*------------------------- Resume routines -------------------------*/ |
| 424 | |
| 425 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 426 | * device_resume_noirq - Execute an "early resume" callback for given device. |
| 427 | * @dev: Device to handle. |
| 428 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 429 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 430 | * The driver of @dev will not receive interrupts while this function is being |
| 431 | * executed. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 432 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 433 | static int device_resume_noirq(struct device *dev, pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 434 | { |
| 435 | int error = 0; |
| 436 | |
| 437 | TRACE_DEVICE(dev); |
| 438 | TRACE_RESUME(0); |
| 439 | |
Rafael J. Wysocki | 33c3374 | 2009-12-13 20:31:12 +0100 | [diff] [blame] | 440 | if (dev->bus && dev->bus->pm) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 441 | pm_dev_dbg(dev, state, "EARLY "); |
| 442 | error = pm_noirq_op(dev, dev->bus->pm, state); |
Dominik Brodowski | e7176a3 | 2010-03-15 21:43:11 +0100 | [diff] [blame] | 443 | if (error) |
| 444 | goto End; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 445 | } |
Rafael J. Wysocki | 33c3374 | 2009-12-13 20:31:12 +0100 | [diff] [blame] | 446 | |
Dominik Brodowski | e7176a3 | 2010-03-15 21:43:11 +0100 | [diff] [blame] | 447 | if (dev->type && dev->type->pm) { |
| 448 | pm_dev_dbg(dev, state, "EARLY type "); |
| 449 | error = pm_noirq_op(dev, dev->type->pm, state); |
| 450 | if (error) |
| 451 | goto End; |
| 452 | } |
| 453 | |
| 454 | if (dev->class && dev->class->pm) { |
| 455 | pm_dev_dbg(dev, state, "EARLY class "); |
| 456 | error = pm_noirq_op(dev, dev->class->pm, state); |
| 457 | } |
| 458 | |
| 459 | End: |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 460 | TRACE_RESUME(error); |
| 461 | return error; |
| 462 | } |
| 463 | |
| 464 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 465 | * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices. |
| 466 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 467 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 468 | * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and |
| 469 | * enable device drivers to receive interrupts. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 470 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 471 | void dpm_resume_noirq(pm_message_t state) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 472 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 473 | struct device *dev; |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 474 | ktime_t starttime = ktime_get(); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 475 | |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 476 | mutex_lock(&dpm_list_mtx); |
Xiaotian Feng | 3eb132c | 2009-08-20 20:28:33 +0200 | [diff] [blame] | 477 | transition_started = false; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 478 | list_for_each_entry(dev, &dpm_list, power.entry) |
| 479 | if (dev->power.status > DPM_OFF) { |
| 480 | int error; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 481 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 482 | dev->power.status = DPM_OFF; |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 483 | error = device_resume_noirq(dev, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 484 | if (error) |
| 485 | pm_dev_err(dev, state, " early", error); |
| 486 | } |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 487 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 488 | dpm_show_time(starttime, state, "early"); |
Rafael J. Wysocki | 2ed8d2b | 2009-03-16 22:34:06 +0100 | [diff] [blame] | 489 | resume_device_irqs(); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 490 | } |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 491 | EXPORT_SYMBOL_GPL(dpm_resume_noirq); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 492 | |
| 493 | /** |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 494 | * legacy_resume - Execute a legacy (bus or class) resume callback for device. |
Randy Dunlap | 0a88422 | 2010-01-08 14:42:57 -0800 | [diff] [blame] | 495 | * @dev: Device to resume. |
| 496 | * @cb: Resume callback to execute. |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 497 | */ |
| 498 | static int legacy_resume(struct device *dev, int (*cb)(struct device *dev)) |
| 499 | { |
| 500 | int error; |
| 501 | ktime_t calltime; |
| 502 | |
| 503 | calltime = initcall_debug_start(dev); |
| 504 | |
| 505 | error = cb(dev); |
| 506 | suspend_report_result(cb, error); |
| 507 | |
| 508 | initcall_debug_report(dev, calltime, error); |
| 509 | |
| 510 | return error; |
| 511 | } |
| 512 | |
| 513 | /** |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 514 | * device_resume - Execute "resume" callbacks for given device. |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 515 | * @dev: Device to handle. |
| 516 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 517 | * @async: If true, the device is being resumed asynchronously. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 518 | */ |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 519 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 520 | { |
| 521 | int error = 0; |
| 522 | |
| 523 | TRACE_DEVICE(dev); |
| 524 | TRACE_RESUME(0); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 525 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 526 | dpm_wait(dev->parent, async); |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 527 | device_lock(dev); |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 528 | |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 529 | dev->power.status = DPM_RESUMING; |
| 530 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 531 | if (dev->bus) { |
| 532 | if (dev->bus->pm) { |
| 533 | pm_dev_dbg(dev, state, ""); |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 534 | error = pm_op(dev, dev->bus->pm, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 535 | } else if (dev->bus->resume) { |
| 536 | pm_dev_dbg(dev, state, "legacy "); |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 537 | error = legacy_resume(dev, dev->bus->resume); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 538 | } |
| 539 | if (error) |
| 540 | goto End; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 541 | } |
| 542 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 543 | if (dev->type) { |
| 544 | if (dev->type->pm) { |
| 545 | pm_dev_dbg(dev, state, "type "); |
| 546 | error = pm_op(dev, dev->type->pm, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 547 | } |
| 548 | if (error) |
| 549 | goto End; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 550 | } |
| 551 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 552 | if (dev->class) { |
| 553 | if (dev->class->pm) { |
| 554 | pm_dev_dbg(dev, state, "class "); |
| 555 | error = pm_op(dev, dev->class->pm, state); |
| 556 | } else if (dev->class->resume) { |
| 557 | pm_dev_dbg(dev, state, "legacy class "); |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 558 | error = legacy_resume(dev, dev->class->resume); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 559 | } |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 560 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 561 | End: |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 562 | device_unlock(dev); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 563 | complete_all(&dev->power.completion); |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 564 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 565 | TRACE_RESUME(error); |
| 566 | return error; |
| 567 | } |
| 568 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 569 | static void async_resume(void *data, async_cookie_t cookie) |
| 570 | { |
| 571 | struct device *dev = (struct device *)data; |
| 572 | int error; |
| 573 | |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 574 | error = device_resume(dev, pm_transition, true); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 575 | if (error) |
| 576 | pm_dev_err(dev, pm_transition, " async", error); |
| 577 | put_device(dev); |
| 578 | } |
| 579 | |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 580 | static bool is_async(struct device *dev) |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 581 | { |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 582 | return dev->power.async_suspend && pm_async_enabled |
| 583 | && !pm_trace_is_enabled(); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 584 | } |
| 585 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 586 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 587 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
| 588 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 589 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 590 | * Execute the appropriate "resume" callback for all devices whose status |
| 591 | * indicates that they are suspended. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 592 | */ |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 593 | static void dpm_resume(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 594 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 595 | struct list_head list; |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 596 | struct device *dev; |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 597 | ktime_t starttime = ktime_get(); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 598 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 599 | INIT_LIST_HEAD(&list); |
| 600 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 601 | pm_transition = state; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 602 | |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 603 | list_for_each_entry(dev, &dpm_list, power.entry) { |
| 604 | if (dev->power.status < DPM_OFF) |
| 605 | continue; |
| 606 | |
| 607 | INIT_COMPLETION(dev->power.completion); |
| 608 | if (is_async(dev)) { |
| 609 | get_device(dev); |
| 610 | async_schedule(async_resume, dev); |
| 611 | } |
| 612 | } |
| 613 | |
| 614 | while (!list_empty(&dpm_list)) { |
| 615 | dev = to_device(dpm_list.next); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 616 | get_device(dev); |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 617 | if (dev->power.status >= DPM_OFF && !is_async(dev)) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 618 | int error; |
| 619 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 620 | mutex_unlock(&dpm_list_mtx); |
| 621 | |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 622 | error = device_resume(dev, state, false); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 623 | |
| 624 | mutex_lock(&dpm_list_mtx); |
| 625 | if (error) |
| 626 | pm_dev_err(dev, state, "", error); |
| 627 | } else if (dev->power.status == DPM_SUSPENDING) { |
| 628 | /* Allow new children of the device to be registered */ |
| 629 | dev->power.status = DPM_RESUMING; |
| 630 | } |
| 631 | if (!list_empty(&dev->power.entry)) |
| 632 | list_move_tail(&dev->power.entry, &list); |
| 633 | put_device(dev); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 634 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 635 | list_splice(&list, &dpm_list); |
| 636 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 637 | async_synchronize_full(); |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 638 | dpm_show_time(starttime, state, NULL); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 639 | } |
| 640 | |
| 641 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 642 | * device_complete - Complete a PM transition for given device. |
| 643 | * @dev: Device to handle. |
| 644 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 645 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 646 | static void device_complete(struct device *dev, pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 647 | { |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 648 | device_lock(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 649 | |
| 650 | if (dev->class && dev->class->pm && dev->class->pm->complete) { |
| 651 | pm_dev_dbg(dev, state, "completing class "); |
| 652 | dev->class->pm->complete(dev); |
| 653 | } |
| 654 | |
| 655 | if (dev->type && dev->type->pm && dev->type->pm->complete) { |
| 656 | pm_dev_dbg(dev, state, "completing type "); |
| 657 | dev->type->pm->complete(dev); |
| 658 | } |
| 659 | |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 660 | if (dev->bus && dev->bus->pm && dev->bus->pm->complete) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 661 | pm_dev_dbg(dev, state, "completing "); |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 662 | dev->bus->pm->complete(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 663 | } |
| 664 | |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 665 | device_unlock(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 666 | } |
| 667 | |
| 668 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 669 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
| 670 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 671 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 672 | * Execute the ->complete() callbacks for all devices whose PM status is not |
| 673 | * DPM_ON (this allows new devices to be registered). |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 674 | */ |
| 675 | static void dpm_complete(pm_message_t state) |
| 676 | { |
| 677 | struct list_head list; |
| 678 | |
| 679 | INIT_LIST_HEAD(&list); |
| 680 | mutex_lock(&dpm_list_mtx); |
Romit Dasgupta | e528e87 | 2009-10-28 22:56:02 +0100 | [diff] [blame] | 681 | transition_started = false; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 682 | while (!list_empty(&dpm_list)) { |
| 683 | struct device *dev = to_device(dpm_list.prev); |
| 684 | |
| 685 | get_device(dev); |
| 686 | if (dev->power.status > DPM_ON) { |
| 687 | dev->power.status = DPM_ON; |
| 688 | mutex_unlock(&dpm_list_mtx); |
| 689 | |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 690 | device_complete(dev, state); |
Alan Stern | aa0baae | 2009-12-21 02:46:11 +0100 | [diff] [blame] | 691 | pm_runtime_put_sync(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 692 | |
| 693 | mutex_lock(&dpm_list_mtx); |
| 694 | } |
| 695 | if (!list_empty(&dev->power.entry)) |
| 696 | list_move(&dev->power.entry, &list); |
| 697 | put_device(dev); |
| 698 | } |
| 699 | list_splice(&list, &dpm_list); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 700 | mutex_unlock(&dpm_list_mtx); |
| 701 | } |
| 702 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 703 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 704 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
| 705 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 706 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 707 | * Execute "resume" callbacks for all devices and complete the PM transition of |
| 708 | * the system. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 709 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 710 | void dpm_resume_end(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 711 | { |
| 712 | might_sleep(); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 713 | dpm_resume(state); |
| 714 | dpm_complete(state); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 715 | } |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 716 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 717 | |
| 718 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 719 | /*------------------------- Suspend routines -------------------------*/ |
| 720 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 721 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 722 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
| 723 | * @sleep_state: PM message representing a sleep state. |
| 724 | * |
| 725 | * Return a PM message representing the resume event corresponding to given |
| 726 | * sleep state. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 727 | */ |
| 728 | static pm_message_t resume_event(pm_message_t sleep_state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 729 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 730 | switch (sleep_state.event) { |
| 731 | case PM_EVENT_SUSPEND: |
| 732 | return PMSG_RESUME; |
| 733 | case PM_EVENT_FREEZE: |
| 734 | case PM_EVENT_QUIESCE: |
| 735 | return PMSG_RECOVER; |
| 736 | case PM_EVENT_HIBERNATE: |
| 737 | return PMSG_RESTORE; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 738 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 739 | return PMSG_ON; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 740 | } |
| 741 | |
| 742 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 743 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
| 744 | * @dev: Device to handle. |
| 745 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 746 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 747 | * The driver of @dev will not receive interrupts while this function is being |
| 748 | * executed. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 749 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 750 | static int device_suspend_noirq(struct device *dev, pm_message_t state) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 751 | { |
| 752 | int error = 0; |
| 753 | |
Dominik Brodowski | e7176a3 | 2010-03-15 21:43:11 +0100 | [diff] [blame] | 754 | if (dev->class && dev->class->pm) { |
| 755 | pm_dev_dbg(dev, state, "LATE class "); |
| 756 | error = pm_noirq_op(dev, dev->class->pm, state); |
| 757 | if (error) |
| 758 | goto End; |
| 759 | } |
| 760 | |
| 761 | if (dev->type && dev->type->pm) { |
| 762 | pm_dev_dbg(dev, state, "LATE type "); |
| 763 | error = pm_noirq_op(dev, dev->type->pm, state); |
| 764 | if (error) |
| 765 | goto End; |
| 766 | } |
| 767 | |
Rafael J. Wysocki | 33c3374 | 2009-12-13 20:31:12 +0100 | [diff] [blame] | 768 | if (dev->bus && dev->bus->pm) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 769 | pm_dev_dbg(dev, state, "LATE "); |
| 770 | error = pm_noirq_op(dev, dev->bus->pm, state); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 771 | } |
Dominik Brodowski | e7176a3 | 2010-03-15 21:43:11 +0100 | [diff] [blame] | 772 | |
| 773 | End: |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 774 | return error; |
| 775 | } |
| 776 | |
| 777 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 778 | * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices. |
| 779 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 780 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 781 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
| 782 | * handlers for all non-sysdev devices. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 783 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 784 | int dpm_suspend_noirq(pm_message_t state) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 785 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 786 | struct device *dev; |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 787 | ktime_t starttime = ktime_get(); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 788 | int error = 0; |
| 789 | |
Rafael J. Wysocki | 2ed8d2b | 2009-03-16 22:34:06 +0100 | [diff] [blame] | 790 | suspend_device_irqs(); |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 791 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 792 | list_for_each_entry_reverse(dev, &dpm_list, power.entry) { |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 793 | error = device_suspend_noirq(dev, state); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 794 | if (error) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 795 | pm_dev_err(dev, state, " late", error); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 796 | break; |
| 797 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 798 | dev->power.status = DPM_OFF_IRQ; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 799 | } |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 800 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 801 | if (error) |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 802 | dpm_resume_noirq(resume_event(state)); |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 803 | else |
| 804 | dpm_show_time(starttime, state, "late"); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 805 | return error; |
| 806 | } |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 807 | EXPORT_SYMBOL_GPL(dpm_suspend_noirq); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 808 | |
| 809 | /** |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 810 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. |
Randy Dunlap | 0a88422 | 2010-01-08 14:42:57 -0800 | [diff] [blame] | 811 | * @dev: Device to suspend. |
| 812 | * @state: PM transition of the system being carried out. |
| 813 | * @cb: Suspend callback to execute. |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 814 | */ |
| 815 | static int legacy_suspend(struct device *dev, pm_message_t state, |
| 816 | int (*cb)(struct device *dev, pm_message_t state)) |
| 817 | { |
| 818 | int error; |
| 819 | ktime_t calltime; |
| 820 | |
| 821 | calltime = initcall_debug_start(dev); |
| 822 | |
| 823 | error = cb(dev, state); |
| 824 | suspend_report_result(cb, error); |
| 825 | |
| 826 | initcall_debug_report(dev, calltime, error); |
| 827 | |
| 828 | return error; |
| 829 | } |
| 830 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 831 | static int async_error; |
| 832 | |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 833 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 834 | * device_suspend - Execute "suspend" callbacks for given device. |
| 835 | * @dev: Device to handle. |
| 836 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 837 | * @async: If true, the device is being suspended asynchronously. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 838 | */ |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 839 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 840 | { |
| 841 | int error = 0; |
| 842 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 843 | dpm_wait_for_children(dev, async); |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 844 | device_lock(dev); |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 845 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 846 | if (async_error) |
| 847 | goto End; |
| 848 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 849 | if (dev->class) { |
| 850 | if (dev->class->pm) { |
| 851 | pm_dev_dbg(dev, state, "class "); |
| 852 | error = pm_op(dev, dev->class->pm, state); |
| 853 | } else if (dev->class->suspend) { |
| 854 | pm_dev_dbg(dev, state, "legacy class "); |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 855 | error = legacy_suspend(dev, state, dev->class->suspend); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 856 | } |
| 857 | if (error) |
| 858 | goto End; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 859 | } |
| 860 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 861 | if (dev->type) { |
| 862 | if (dev->type->pm) { |
| 863 | pm_dev_dbg(dev, state, "type "); |
| 864 | error = pm_op(dev, dev->type->pm, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 865 | } |
| 866 | if (error) |
| 867 | goto End; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 868 | } |
| 869 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 870 | if (dev->bus) { |
| 871 | if (dev->bus->pm) { |
| 872 | pm_dev_dbg(dev, state, ""); |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 873 | error = pm_op(dev, dev->bus->pm, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 874 | } else if (dev->bus->suspend) { |
| 875 | pm_dev_dbg(dev, state, "legacy "); |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 876 | error = legacy_suspend(dev, state, dev->bus->suspend); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 877 | } |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 878 | } |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 879 | |
| 880 | if (!error) |
| 881 | dev->power.status = DPM_OFF; |
| 882 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 883 | End: |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 884 | device_unlock(dev); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 885 | complete_all(&dev->power.completion); |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 886 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 887 | return error; |
| 888 | } |
| 889 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 890 | static void async_suspend(void *data, async_cookie_t cookie) |
| 891 | { |
| 892 | struct device *dev = (struct device *)data; |
| 893 | int error; |
| 894 | |
| 895 | error = __device_suspend(dev, pm_transition, true); |
| 896 | if (error) { |
| 897 | pm_dev_err(dev, pm_transition, " async", error); |
| 898 | async_error = error; |
| 899 | } |
| 900 | |
| 901 | put_device(dev); |
| 902 | } |
| 903 | |
| 904 | static int device_suspend(struct device *dev) |
| 905 | { |
| 906 | INIT_COMPLETION(dev->power.completion); |
| 907 | |
Rafael J. Wysocki | 0e06b4a | 2010-01-23 22:25:15 +0100 | [diff] [blame] | 908 | if (pm_async_enabled && dev->power.async_suspend) { |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 909 | get_device(dev); |
| 910 | async_schedule(async_suspend, dev); |
| 911 | return 0; |
| 912 | } |
| 913 | |
| 914 | return __device_suspend(dev, pm_transition, false); |
| 915 | } |
| 916 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 917 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 918 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
| 919 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 920 | */ |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 921 | static int dpm_suspend(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 922 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 923 | struct list_head list; |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 924 | ktime_t starttime = ktime_get(); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 925 | int error = 0; |
| 926 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 927 | INIT_LIST_HEAD(&list); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 928 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 929 | pm_transition = state; |
| 930 | async_error = 0; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 931 | while (!list_empty(&dpm_list)) { |
| 932 | struct device *dev = to_device(dpm_list.prev); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 933 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 934 | get_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 935 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 936 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 937 | error = device_suspend(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 938 | |
Alan Stern | 1b3cbec | 2008-02-29 11:50:22 -0500 | [diff] [blame] | 939 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 940 | if (error) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 941 | pm_dev_err(dev, state, "", error); |
| 942 | put_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 943 | break; |
| 944 | } |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 945 | if (!list_empty(&dev->power.entry)) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 946 | list_move(&dev->power.entry, &list); |
| 947 | put_device(dev); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 948 | if (async_error) |
| 949 | break; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 950 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 951 | list_splice(&list, dpm_list.prev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 952 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 953 | async_synchronize_full(); |
| 954 | if (!error) |
| 955 | error = async_error; |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 956 | if (!error) |
| 957 | dpm_show_time(starttime, state, NULL); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 958 | return error; |
| 959 | } |
| 960 | |
| 961 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 962 | * device_prepare - Prepare a device for system power transition. |
| 963 | * @dev: Device to handle. |
| 964 | * @state: PM transition of the system being carried out. |
| 965 | * |
| 966 | * Execute the ->prepare() callback(s) for given device. No new children of the |
| 967 | * device may be registered after this function has returned. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 968 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 969 | static int device_prepare(struct device *dev, pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 970 | { |
| 971 | int error = 0; |
| 972 | |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 973 | device_lock(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 974 | |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 975 | if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 976 | pm_dev_dbg(dev, state, "preparing "); |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 977 | error = dev->bus->pm->prepare(dev); |
| 978 | suspend_report_result(dev->bus->pm->prepare, error); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 979 | if (error) |
| 980 | goto End; |
| 981 | } |
| 982 | |
| 983 | if (dev->type && dev->type->pm && dev->type->pm->prepare) { |
| 984 | pm_dev_dbg(dev, state, "preparing type "); |
| 985 | error = dev->type->pm->prepare(dev); |
| 986 | suspend_report_result(dev->type->pm->prepare, error); |
| 987 | if (error) |
| 988 | goto End; |
| 989 | } |
| 990 | |
| 991 | if (dev->class && dev->class->pm && dev->class->pm->prepare) { |
| 992 | pm_dev_dbg(dev, state, "preparing class "); |
| 993 | error = dev->class->pm->prepare(dev); |
| 994 | suspend_report_result(dev->class->pm->prepare, error); |
| 995 | } |
| 996 | End: |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 997 | device_unlock(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 998 | |
| 999 | return error; |
| 1000 | } |
| 1001 | |
| 1002 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 1003 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
| 1004 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1005 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 1006 | * Execute the ->prepare() callback(s) for all devices. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1007 | */ |
| 1008 | static int dpm_prepare(pm_message_t state) |
| 1009 | { |
| 1010 | struct list_head list; |
| 1011 | int error = 0; |
| 1012 | |
| 1013 | INIT_LIST_HEAD(&list); |
| 1014 | mutex_lock(&dpm_list_mtx); |
| 1015 | transition_started = true; |
| 1016 | while (!list_empty(&dpm_list)) { |
| 1017 | struct device *dev = to_device(dpm_list.next); |
| 1018 | |
| 1019 | get_device(dev); |
| 1020 | dev->power.status = DPM_PREPARING; |
| 1021 | mutex_unlock(&dpm_list_mtx); |
| 1022 | |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 1023 | pm_runtime_get_noresume(dev); |
| 1024 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) { |
| 1025 | /* Wake-up requested during system sleep transition. */ |
Alan Stern | aa0baae | 2009-12-21 02:46:11 +0100 | [diff] [blame] | 1026 | pm_runtime_put_sync(dev); |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 1027 | error = -EBUSY; |
| 1028 | } else { |
| 1029 | error = device_prepare(dev, state); |
| 1030 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1031 | |
| 1032 | mutex_lock(&dpm_list_mtx); |
| 1033 | if (error) { |
| 1034 | dev->power.status = DPM_ON; |
| 1035 | if (error == -EAGAIN) { |
| 1036 | put_device(dev); |
Sebastian Ott | 886a7a3 | 2009-07-08 13:26:05 +0200 | [diff] [blame] | 1037 | error = 0; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1038 | continue; |
| 1039 | } |
| 1040 | printk(KERN_ERR "PM: Failed to prepare device %s " |
| 1041 | "for power transition: error %d\n", |
| 1042 | kobject_name(&dev->kobj), error); |
| 1043 | put_device(dev); |
| 1044 | break; |
| 1045 | } |
| 1046 | dev->power.status = DPM_SUSPENDING; |
| 1047 | if (!list_empty(&dev->power.entry)) |
| 1048 | list_move_tail(&dev->power.entry, &list); |
| 1049 | put_device(dev); |
| 1050 | } |
| 1051 | list_splice(&list, &dpm_list); |
| 1052 | mutex_unlock(&dpm_list_mtx); |
| 1053 | return error; |
| 1054 | } |
| 1055 | |
| 1056 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 1057 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
| 1058 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1059 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 1060 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
| 1061 | * callbacks for them. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1062 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 1063 | int dpm_suspend_start(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1064 | { |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1065 | int error; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1066 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1067 | might_sleep(); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1068 | error = dpm_prepare(state); |
| 1069 | if (!error) |
| 1070 | error = dpm_suspend(state); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1071 | return error; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1072 | } |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 1073 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1074 | |
| 1075 | void __suspend_report_result(const char *function, void *fn, int ret) |
| 1076 | { |
Bjorn Helgaas | c80cfb0 | 2008-10-15 22:01:35 -0700 | [diff] [blame] | 1077 | if (ret) |
| 1078 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1079 | } |
| 1080 | EXPORT_SYMBOL_GPL(__suspend_report_result); |
Rafael J. Wysocki | f8824ce | 2010-01-27 23:47:38 +0100 | [diff] [blame] | 1081 | |
| 1082 | /** |
| 1083 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. |
| 1084 | * @dev: Device to wait for. |
| 1085 | * @subordinate: Device that needs to wait for @dev. |
| 1086 | */ |
| 1087 | void device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
| 1088 | { |
| 1089 | dpm_wait(dev, subordinate->power.async_suspend); |
| 1090 | } |
| 1091 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); |