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 | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 26 | #include <linux/rwsem.h> |
Rafael J. Wysocki | 2ed8d2b | 2009-03-16 22:34:06 +0100 | [diff] [blame] | 27 | #include <linux/interrupt.h> |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 28 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 29 | #include "../base.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include "power.h" |
| 31 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 32 | /* |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 33 | * 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] | 34 | * because children are guaranteed to be discovered after parents, and |
| 35 | * are inserted at the back of the list on discovery. |
| 36 | * |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 37 | * Since device_pm_add() may be called with a device semaphore held, |
| 38 | * we must never try to acquire a device semaphore while holding |
| 39 | * dpm_list_mutex. |
| 40 | */ |
| 41 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 42 | LIST_HEAD(dpm_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 44 | static DEFINE_MUTEX(dpm_list_mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 46 | /* |
| 47 | * Set once the preparation of devices for a PM transition has started, reset |
| 48 | * before starting to resume devices. Protected by dpm_list_mtx. |
| 49 | */ |
| 50 | static bool transition_started; |
| 51 | |
| 52 | /** |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame^] | 53 | * device_pm_init - Initialize the PM-related part of a device object |
| 54 | * @dev: Device object being initialized. |
| 55 | */ |
| 56 | void device_pm_init(struct device *dev) |
| 57 | { |
| 58 | dev->power.status = DPM_ON; |
| 59 | pm_runtime_init(dev); |
| 60 | } |
| 61 | |
| 62 | /** |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 63 | * device_pm_lock - lock the list of active devices used by the PM core |
| 64 | */ |
| 65 | void device_pm_lock(void) |
| 66 | { |
| 67 | mutex_lock(&dpm_list_mtx); |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * device_pm_unlock - unlock the list of active devices used by the PM core |
| 72 | */ |
| 73 | void device_pm_unlock(void) |
| 74 | { |
| 75 | mutex_unlock(&dpm_list_mtx); |
| 76 | } |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 77 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 78 | /** |
| 79 | * device_pm_add - add a device to the list of active devices |
| 80 | * @dev: Device to be added to the list |
| 81 | */ |
Alan Stern | 3b98aea | 2008-08-07 13:06:12 -0400 | [diff] [blame] | 82 | void device_pm_add(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | pr_debug("PM: Adding info for %s:%s\n", |
Dmitry Torokhov | c48ea60 | 2007-04-11 01:37:18 -0400 | [diff] [blame] | 85 | dev->bus ? dev->bus->name : "No Bus", |
| 86 | kobject_name(&dev->kobj)); |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 87 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 88 | if (dev->parent) { |
Rafael J. Wysocki | f5a6d95 | 2008-08-09 01:05:13 +0200 | [diff] [blame] | 89 | if (dev->parent->power.status >= DPM_SUSPENDING) |
| 90 | dev_warn(dev, "parent %s should not be sleeping\n", |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 91 | dev_name(dev->parent)); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 92 | } else if (transition_started) { |
| 93 | /* |
| 94 | * We refuse to register parentless devices while a PM |
| 95 | * transition is in progress in order to avoid leaving them |
| 96 | * unhandled down the road |
| 97 | */ |
Arjan van de Ven | 728f089 | 2008-09-20 19:09:00 -0700 | [diff] [blame] | 98 | dev_WARN(dev, "Parentless device registered during a PM transaction\n"); |
Rafael J. Wysocki | 58aca23 | 2008-03-12 00:57:22 +0100 | [diff] [blame] | 99 | } |
Alan Stern | 3b98aea | 2008-08-07 13:06:12 -0400 | [diff] [blame] | 100 | |
| 101 | list_add_tail(&dev->power.entry, &dpm_list); |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 102 | mutex_unlock(&dpm_list_mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | } |
| 104 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 105 | /** |
| 106 | * device_pm_remove - remove a device from the list of active devices |
| 107 | * @dev: Device to be removed from the list |
| 108 | * |
| 109 | * This function also removes the device's PM-related sysfs attributes. |
| 110 | */ |
Rafael J. Wysocki | 9cddad7 | 2007-06-13 15:53:34 +0200 | [diff] [blame] | 111 | void device_pm_remove(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | { |
| 113 | pr_debug("PM: Removing info for %s:%s\n", |
Dmitry Torokhov | c48ea60 | 2007-04-11 01:37:18 -0400 | [diff] [blame] | 114 | dev->bus ? dev->bus->name : "No Bus", |
| 115 | kobject_name(&dev->kobj)); |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 116 | mutex_lock(&dpm_list_mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | list_del_init(&dev->power.entry); |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 118 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame^] | 119 | pm_runtime_remove(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 120 | } |
| 121 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 122 | /** |
Cornelia Huck | ffa6a70 | 2009-03-04 12:44:00 +0100 | [diff] [blame] | 123 | * device_pm_move_before - move device in dpm_list |
| 124 | * @deva: Device to move in dpm_list |
| 125 | * @devb: Device @deva should come before |
| 126 | */ |
| 127 | void device_pm_move_before(struct device *deva, struct device *devb) |
| 128 | { |
| 129 | pr_debug("PM: Moving %s:%s before %s:%s\n", |
| 130 | deva->bus ? deva->bus->name : "No Bus", |
| 131 | kobject_name(&deva->kobj), |
| 132 | devb->bus ? devb->bus->name : "No Bus", |
| 133 | kobject_name(&devb->kobj)); |
| 134 | /* Delete deva from dpm_list and reinsert before devb. */ |
| 135 | list_move_tail(&deva->power.entry, &devb->power.entry); |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * device_pm_move_after - move device in dpm_list |
| 140 | * @deva: Device to move in dpm_list |
| 141 | * @devb: Device @deva should come after |
| 142 | */ |
| 143 | void device_pm_move_after(struct device *deva, struct device *devb) |
| 144 | { |
| 145 | pr_debug("PM: Moving %s:%s after %s:%s\n", |
| 146 | deva->bus ? deva->bus->name : "No Bus", |
| 147 | kobject_name(&deva->kobj), |
| 148 | devb->bus ? devb->bus->name : "No Bus", |
| 149 | kobject_name(&devb->kobj)); |
| 150 | /* Delete deva from dpm_list and reinsert after devb. */ |
| 151 | list_move(&deva->power.entry, &devb->power.entry); |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * device_pm_move_last - move device to end of dpm_list |
| 156 | * @dev: Device to move in dpm_list |
| 157 | */ |
| 158 | void device_pm_move_last(struct device *dev) |
| 159 | { |
| 160 | pr_debug("PM: Moving %s:%s to end of list\n", |
| 161 | dev->bus ? dev->bus->name : "No Bus", |
| 162 | kobject_name(&dev->kobj)); |
| 163 | list_move_tail(&dev->power.entry, &dpm_list); |
| 164 | } |
| 165 | |
| 166 | /** |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 167 | * pm_op - execute the PM operation appropiate for given PM event |
| 168 | * @dev: Device. |
| 169 | * @ops: PM operations to choose from. |
| 170 | * @state: PM transition of the system being carried out. |
| 171 | */ |
Dmitry Torokhov | d9ab771 | 2009-07-22 00:37:25 +0200 | [diff] [blame] | 172 | static int pm_op(struct device *dev, |
| 173 | const struct dev_pm_ops *ops, |
| 174 | pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 175 | { |
| 176 | int error = 0; |
| 177 | |
| 178 | switch (state.event) { |
| 179 | #ifdef CONFIG_SUSPEND |
| 180 | case PM_EVENT_SUSPEND: |
| 181 | if (ops->suspend) { |
| 182 | error = ops->suspend(dev); |
| 183 | suspend_report_result(ops->suspend, error); |
| 184 | } |
| 185 | break; |
| 186 | case PM_EVENT_RESUME: |
| 187 | if (ops->resume) { |
| 188 | error = ops->resume(dev); |
| 189 | suspend_report_result(ops->resume, error); |
| 190 | } |
| 191 | break; |
| 192 | #endif /* CONFIG_SUSPEND */ |
| 193 | #ifdef CONFIG_HIBERNATION |
| 194 | case PM_EVENT_FREEZE: |
| 195 | case PM_EVENT_QUIESCE: |
| 196 | if (ops->freeze) { |
| 197 | error = ops->freeze(dev); |
| 198 | suspend_report_result(ops->freeze, error); |
| 199 | } |
| 200 | break; |
| 201 | case PM_EVENT_HIBERNATE: |
| 202 | if (ops->poweroff) { |
| 203 | error = ops->poweroff(dev); |
| 204 | suspend_report_result(ops->poweroff, error); |
| 205 | } |
| 206 | break; |
| 207 | case PM_EVENT_THAW: |
| 208 | case PM_EVENT_RECOVER: |
| 209 | if (ops->thaw) { |
| 210 | error = ops->thaw(dev); |
| 211 | suspend_report_result(ops->thaw, error); |
| 212 | } |
| 213 | break; |
| 214 | case PM_EVENT_RESTORE: |
| 215 | if (ops->restore) { |
| 216 | error = ops->restore(dev); |
| 217 | suspend_report_result(ops->restore, error); |
| 218 | } |
| 219 | break; |
| 220 | #endif /* CONFIG_HIBERNATION */ |
| 221 | default: |
| 222 | error = -EINVAL; |
| 223 | } |
| 224 | return error; |
| 225 | } |
| 226 | |
| 227 | /** |
| 228 | * pm_noirq_op - execute the PM operation appropiate for given PM event |
| 229 | * @dev: Device. |
| 230 | * @ops: PM operations to choose from. |
| 231 | * @state: PM transition of the system being carried out. |
| 232 | * |
| 233 | * The operation is executed with interrupts disabled by the only remaining |
| 234 | * functional CPU in the system. |
| 235 | */ |
Dmitry Torokhov | d9ab771 | 2009-07-22 00:37:25 +0200 | [diff] [blame] | 236 | static int pm_noirq_op(struct device *dev, |
| 237 | const struct dev_pm_ops *ops, |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 238 | pm_message_t state) |
| 239 | { |
| 240 | int error = 0; |
| 241 | |
| 242 | switch (state.event) { |
| 243 | #ifdef CONFIG_SUSPEND |
| 244 | case PM_EVENT_SUSPEND: |
| 245 | if (ops->suspend_noirq) { |
| 246 | error = ops->suspend_noirq(dev); |
| 247 | suspend_report_result(ops->suspend_noirq, error); |
| 248 | } |
| 249 | break; |
| 250 | case PM_EVENT_RESUME: |
| 251 | if (ops->resume_noirq) { |
| 252 | error = ops->resume_noirq(dev); |
| 253 | suspend_report_result(ops->resume_noirq, error); |
| 254 | } |
| 255 | break; |
| 256 | #endif /* CONFIG_SUSPEND */ |
| 257 | #ifdef CONFIG_HIBERNATION |
| 258 | case PM_EVENT_FREEZE: |
| 259 | case PM_EVENT_QUIESCE: |
| 260 | if (ops->freeze_noirq) { |
| 261 | error = ops->freeze_noirq(dev); |
| 262 | suspend_report_result(ops->freeze_noirq, error); |
| 263 | } |
| 264 | break; |
| 265 | case PM_EVENT_HIBERNATE: |
| 266 | if (ops->poweroff_noirq) { |
| 267 | error = ops->poweroff_noirq(dev); |
| 268 | suspend_report_result(ops->poweroff_noirq, error); |
| 269 | } |
| 270 | break; |
| 271 | case PM_EVENT_THAW: |
| 272 | case PM_EVENT_RECOVER: |
| 273 | if (ops->thaw_noirq) { |
| 274 | error = ops->thaw_noirq(dev); |
| 275 | suspend_report_result(ops->thaw_noirq, error); |
| 276 | } |
| 277 | break; |
| 278 | case PM_EVENT_RESTORE: |
| 279 | if (ops->restore_noirq) { |
| 280 | error = ops->restore_noirq(dev); |
| 281 | suspend_report_result(ops->restore_noirq, error); |
| 282 | } |
| 283 | break; |
| 284 | #endif /* CONFIG_HIBERNATION */ |
| 285 | default: |
| 286 | error = -EINVAL; |
| 287 | } |
| 288 | return error; |
| 289 | } |
| 290 | |
| 291 | static char *pm_verb(int event) |
| 292 | { |
| 293 | switch (event) { |
| 294 | case PM_EVENT_SUSPEND: |
| 295 | return "suspend"; |
| 296 | case PM_EVENT_RESUME: |
| 297 | return "resume"; |
| 298 | case PM_EVENT_FREEZE: |
| 299 | return "freeze"; |
| 300 | case PM_EVENT_QUIESCE: |
| 301 | return "quiesce"; |
| 302 | case PM_EVENT_HIBERNATE: |
| 303 | return "hibernate"; |
| 304 | case PM_EVENT_THAW: |
| 305 | return "thaw"; |
| 306 | case PM_EVENT_RESTORE: |
| 307 | return "restore"; |
| 308 | case PM_EVENT_RECOVER: |
| 309 | return "recover"; |
| 310 | default: |
| 311 | return "(unknown PM event)"; |
| 312 | } |
| 313 | } |
| 314 | |
| 315 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) |
| 316 | { |
| 317 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), |
| 318 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? |
| 319 | ", may wakeup" : ""); |
| 320 | } |
| 321 | |
| 322 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, |
| 323 | int error) |
| 324 | { |
| 325 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", |
| 326 | kobject_name(&dev->kobj), pm_verb(state.event), info, error); |
| 327 | } |
| 328 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 329 | /*------------------------- Resume routines -------------------------*/ |
| 330 | |
| 331 | /** |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 332 | * device_resume_noirq - Power on one device (early resume). |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 333 | * @dev: Device. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 334 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 335 | * |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 336 | * Must be called with interrupts disabled. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 337 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 338 | static int device_resume_noirq(struct device *dev, pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 339 | { |
| 340 | int error = 0; |
| 341 | |
| 342 | TRACE_DEVICE(dev); |
| 343 | TRACE_RESUME(0); |
| 344 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 345 | if (!dev->bus) |
| 346 | goto End; |
| 347 | |
| 348 | if (dev->bus->pm) { |
| 349 | pm_dev_dbg(dev, state, "EARLY "); |
| 350 | error = pm_noirq_op(dev, dev->bus->pm, state); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 351 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 352 | End: |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 353 | TRACE_RESUME(error); |
| 354 | return error; |
| 355 | } |
| 356 | |
| 357 | /** |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 358 | * dpm_resume_noirq - Power on all regular (non-sysdev) devices. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 359 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 360 | * |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 361 | * Call the "noirq" resume handlers for all devices marked as |
| 362 | * DPM_OFF_IRQ and enable device drivers to receive interrupts. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 363 | * |
Rafael J. Wysocki | 2ed8d2b | 2009-03-16 22:34:06 +0100 | [diff] [blame] | 364 | * Must be called under dpm_list_mtx. Device drivers should not receive |
| 365 | * interrupts while it's being executed. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 366 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 367 | void dpm_resume_noirq(pm_message_t state) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 368 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 369 | struct device *dev; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 370 | |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 371 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 372 | list_for_each_entry(dev, &dpm_list, power.entry) |
| 373 | if (dev->power.status > DPM_OFF) { |
| 374 | int error; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 375 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 376 | dev->power.status = DPM_OFF; |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 377 | error = device_resume_noirq(dev, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 378 | if (error) |
| 379 | pm_dev_err(dev, state, " early", error); |
| 380 | } |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 381 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 2ed8d2b | 2009-03-16 22:34:06 +0100 | [diff] [blame] | 382 | resume_device_irqs(); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 383 | } |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 384 | EXPORT_SYMBOL_GPL(dpm_resume_noirq); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 385 | |
| 386 | /** |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 387 | * device_resume - Restore state for one device. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 388 | * @dev: Device. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 389 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 390 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 391 | static int device_resume(struct device *dev, pm_message_t state) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 392 | { |
| 393 | int error = 0; |
| 394 | |
| 395 | TRACE_DEVICE(dev); |
| 396 | TRACE_RESUME(0); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 397 | |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 398 | down(&dev->sem); |
| 399 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 400 | if (dev->bus) { |
| 401 | if (dev->bus->pm) { |
| 402 | pm_dev_dbg(dev, state, ""); |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 403 | error = pm_op(dev, dev->bus->pm, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 404 | } else if (dev->bus->resume) { |
| 405 | pm_dev_dbg(dev, state, "legacy "); |
| 406 | error = dev->bus->resume(dev); |
| 407 | } |
| 408 | if (error) |
| 409 | goto End; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 410 | } |
| 411 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 412 | if (dev->type) { |
| 413 | if (dev->type->pm) { |
| 414 | pm_dev_dbg(dev, state, "type "); |
| 415 | error = pm_op(dev, dev->type->pm, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 416 | } |
| 417 | if (error) |
| 418 | goto End; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 419 | } |
| 420 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 421 | if (dev->class) { |
| 422 | if (dev->class->pm) { |
| 423 | pm_dev_dbg(dev, state, "class "); |
| 424 | error = pm_op(dev, dev->class->pm, state); |
| 425 | } else if (dev->class->resume) { |
| 426 | pm_dev_dbg(dev, state, "legacy class "); |
| 427 | error = dev->class->resume(dev); |
| 428 | } |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 429 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 430 | End: |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 431 | up(&dev->sem); |
| 432 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 433 | TRACE_RESUME(error); |
| 434 | return error; |
| 435 | } |
| 436 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 437 | /** |
| 438 | * dpm_resume - Resume every device. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 439 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 440 | * |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 441 | * Execute the appropriate "resume" callback for all devices the status of |
| 442 | * which indicates that they are inactive. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 443 | */ |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 444 | static void dpm_resume(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 445 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 446 | struct list_head list; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 447 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 448 | INIT_LIST_HEAD(&list); |
| 449 | mutex_lock(&dpm_list_mtx); |
| 450 | transition_started = false; |
| 451 | while (!list_empty(&dpm_list)) { |
| 452 | struct device *dev = to_device(dpm_list.next); |
| 453 | |
| 454 | get_device(dev); |
| 455 | if (dev->power.status >= DPM_OFF) { |
| 456 | int error; |
| 457 | |
| 458 | dev->power.status = DPM_RESUMING; |
| 459 | mutex_unlock(&dpm_list_mtx); |
| 460 | |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 461 | error = device_resume(dev, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 462 | |
| 463 | mutex_lock(&dpm_list_mtx); |
| 464 | if (error) |
| 465 | pm_dev_err(dev, state, "", error); |
| 466 | } else if (dev->power.status == DPM_SUSPENDING) { |
| 467 | /* Allow new children of the device to be registered */ |
| 468 | dev->power.status = DPM_RESUMING; |
| 469 | } |
| 470 | if (!list_empty(&dev->power.entry)) |
| 471 | list_move_tail(&dev->power.entry, &list); |
| 472 | put_device(dev); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 473 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 474 | list_splice(&list, &dpm_list); |
| 475 | mutex_unlock(&dpm_list_mtx); |
| 476 | } |
| 477 | |
| 478 | /** |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 479 | * device_complete - Complete a PM transition for given device |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 480 | * @dev: Device. |
| 481 | * @state: PM transition of the system being carried out. |
| 482 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 483 | static void device_complete(struct device *dev, pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 484 | { |
| 485 | down(&dev->sem); |
| 486 | |
| 487 | if (dev->class && dev->class->pm && dev->class->pm->complete) { |
| 488 | pm_dev_dbg(dev, state, "completing class "); |
| 489 | dev->class->pm->complete(dev); |
| 490 | } |
| 491 | |
| 492 | if (dev->type && dev->type->pm && dev->type->pm->complete) { |
| 493 | pm_dev_dbg(dev, state, "completing type "); |
| 494 | dev->type->pm->complete(dev); |
| 495 | } |
| 496 | |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 497 | if (dev->bus && dev->bus->pm && dev->bus->pm->complete) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 498 | pm_dev_dbg(dev, state, "completing "); |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 499 | dev->bus->pm->complete(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 500 | } |
| 501 | |
| 502 | up(&dev->sem); |
| 503 | } |
| 504 | |
| 505 | /** |
| 506 | * dpm_complete - Complete a PM transition for all devices. |
| 507 | * @state: PM transition of the system being carried out. |
| 508 | * |
| 509 | * Execute the ->complete() callbacks for all devices that are not marked |
| 510 | * as DPM_ON. |
| 511 | */ |
| 512 | static void dpm_complete(pm_message_t state) |
| 513 | { |
| 514 | struct list_head list; |
| 515 | |
| 516 | INIT_LIST_HEAD(&list); |
| 517 | mutex_lock(&dpm_list_mtx); |
| 518 | while (!list_empty(&dpm_list)) { |
| 519 | struct device *dev = to_device(dpm_list.prev); |
| 520 | |
| 521 | get_device(dev); |
| 522 | if (dev->power.status > DPM_ON) { |
| 523 | dev->power.status = DPM_ON; |
| 524 | mutex_unlock(&dpm_list_mtx); |
| 525 | |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 526 | device_complete(dev, state); |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame^] | 527 | pm_runtime_put_noidle(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 528 | |
| 529 | mutex_lock(&dpm_list_mtx); |
| 530 | } |
| 531 | if (!list_empty(&dev->power.entry)) |
| 532 | list_move(&dev->power.entry, &list); |
| 533 | put_device(dev); |
| 534 | } |
| 535 | list_splice(&list, &dpm_list); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 536 | mutex_unlock(&dpm_list_mtx); |
| 537 | } |
| 538 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 539 | /** |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 540 | * dpm_resume_end - Restore state of each device in system. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 541 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 542 | * |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 543 | * Resume all the devices, unlock them all, and allow new |
| 544 | * devices to be registered once again. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 545 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 546 | void dpm_resume_end(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 547 | { |
| 548 | might_sleep(); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 549 | dpm_resume(state); |
| 550 | dpm_complete(state); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 551 | } |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 552 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 553 | |
| 554 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 555 | /*------------------------- Suspend routines -------------------------*/ |
| 556 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 557 | /** |
| 558 | * resume_event - return a PM message representing the resume event |
| 559 | * corresponding to given sleep state. |
| 560 | * @sleep_state: PM message representing a sleep state. |
| 561 | */ |
| 562 | static pm_message_t resume_event(pm_message_t sleep_state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 563 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 564 | switch (sleep_state.event) { |
| 565 | case PM_EVENT_SUSPEND: |
| 566 | return PMSG_RESUME; |
| 567 | case PM_EVENT_FREEZE: |
| 568 | case PM_EVENT_QUIESCE: |
| 569 | return PMSG_RECOVER; |
| 570 | case PM_EVENT_HIBERNATE: |
| 571 | return PMSG_RESTORE; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 572 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 573 | return PMSG_ON; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 574 | } |
| 575 | |
| 576 | /** |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 577 | * device_suspend_noirq - Shut down one device (late suspend). |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 578 | * @dev: Device. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 579 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 580 | * |
| 581 | * This is called with interrupts off and only a single CPU running. |
| 582 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 583 | 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] | 584 | { |
| 585 | int error = 0; |
| 586 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 587 | if (!dev->bus) |
| 588 | return 0; |
| 589 | |
| 590 | if (dev->bus->pm) { |
| 591 | pm_dev_dbg(dev, state, "LATE "); |
| 592 | error = pm_noirq_op(dev, dev->bus->pm, state); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 593 | } |
| 594 | return error; |
| 595 | } |
| 596 | |
| 597 | /** |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 598 | * dpm_suspend_noirq - Power down all regular (non-sysdev) devices. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 599 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 600 | * |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 601 | * Prevent device drivers from receiving interrupts and call the "noirq" |
Rafael J. Wysocki | 2ed8d2b | 2009-03-16 22:34:06 +0100 | [diff] [blame] | 602 | * suspend handlers. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 603 | * |
Rafael J. Wysocki | 2ed8d2b | 2009-03-16 22:34:06 +0100 | [diff] [blame] | 604 | * Must be called under dpm_list_mtx. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 605 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 606 | int dpm_suspend_noirq(pm_message_t state) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 607 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 608 | struct device *dev; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 609 | int error = 0; |
| 610 | |
Rafael J. Wysocki | 2ed8d2b | 2009-03-16 22:34:06 +0100 | [diff] [blame] | 611 | suspend_device_irqs(); |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 612 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 613 | list_for_each_entry_reverse(dev, &dpm_list, power.entry) { |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 614 | error = device_suspend_noirq(dev, state); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 615 | if (error) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 616 | pm_dev_err(dev, state, " late", error); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 617 | break; |
| 618 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 619 | dev->power.status = DPM_OFF_IRQ; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 620 | } |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 621 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 622 | if (error) |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 623 | dpm_resume_noirq(resume_event(state)); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 624 | return error; |
| 625 | } |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 626 | EXPORT_SYMBOL_GPL(dpm_suspend_noirq); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 627 | |
| 628 | /** |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 629 | * device_suspend - Save state of one device. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 630 | * @dev: Device. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 631 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 632 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 633 | static int device_suspend(struct device *dev, pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 634 | { |
| 635 | int error = 0; |
| 636 | |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 637 | down(&dev->sem); |
| 638 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 639 | if (dev->class) { |
| 640 | if (dev->class->pm) { |
| 641 | pm_dev_dbg(dev, state, "class "); |
| 642 | error = pm_op(dev, dev->class->pm, state); |
| 643 | } else if (dev->class->suspend) { |
| 644 | pm_dev_dbg(dev, state, "legacy class "); |
| 645 | error = dev->class->suspend(dev, state); |
| 646 | suspend_report_result(dev->class->suspend, error); |
| 647 | } |
| 648 | if (error) |
| 649 | goto End; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 650 | } |
| 651 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 652 | if (dev->type) { |
| 653 | if (dev->type->pm) { |
| 654 | pm_dev_dbg(dev, state, "type "); |
| 655 | error = pm_op(dev, dev->type->pm, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 656 | } |
| 657 | if (error) |
| 658 | goto End; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 659 | } |
| 660 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 661 | if (dev->bus) { |
| 662 | if (dev->bus->pm) { |
| 663 | pm_dev_dbg(dev, state, ""); |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 664 | error = pm_op(dev, dev->bus->pm, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 665 | } else if (dev->bus->suspend) { |
| 666 | pm_dev_dbg(dev, state, "legacy "); |
| 667 | error = dev->bus->suspend(dev, state); |
| 668 | suspend_report_result(dev->bus->suspend, error); |
| 669 | } |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 670 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 671 | End: |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 672 | up(&dev->sem); |
| 673 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 674 | return error; |
| 675 | } |
| 676 | |
| 677 | /** |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 678 | * dpm_suspend - Suspend every device. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 679 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 680 | * |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 681 | * Execute the appropriate "suspend" callbacks for all devices. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 682 | */ |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 683 | static int dpm_suspend(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 684 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 685 | struct list_head list; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 686 | int error = 0; |
| 687 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 688 | INIT_LIST_HEAD(&list); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 689 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 690 | while (!list_empty(&dpm_list)) { |
| 691 | struct device *dev = to_device(dpm_list.prev); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 692 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 693 | get_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 694 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 695 | |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 696 | error = device_suspend(dev, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 697 | |
Alan Stern | 1b3cbec | 2008-02-29 11:50:22 -0500 | [diff] [blame] | 698 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 699 | if (error) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 700 | pm_dev_err(dev, state, "", error); |
| 701 | put_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 702 | break; |
| 703 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 704 | dev->power.status = DPM_OFF; |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 705 | if (!list_empty(&dev->power.entry)) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 706 | list_move(&dev->power.entry, &list); |
| 707 | put_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 708 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 709 | list_splice(&list, dpm_list.prev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 710 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 711 | return error; |
| 712 | } |
| 713 | |
| 714 | /** |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 715 | * device_prepare - Execute the ->prepare() callback(s) for given device. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 716 | * @dev: Device. |
| 717 | * @state: PM transition of the system being carried out. |
| 718 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 719 | static int device_prepare(struct device *dev, pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 720 | { |
| 721 | int error = 0; |
| 722 | |
| 723 | down(&dev->sem); |
| 724 | |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 725 | if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 726 | pm_dev_dbg(dev, state, "preparing "); |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 727 | error = dev->bus->pm->prepare(dev); |
| 728 | suspend_report_result(dev->bus->pm->prepare, error); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 729 | if (error) |
| 730 | goto End; |
| 731 | } |
| 732 | |
| 733 | if (dev->type && dev->type->pm && dev->type->pm->prepare) { |
| 734 | pm_dev_dbg(dev, state, "preparing type "); |
| 735 | error = dev->type->pm->prepare(dev); |
| 736 | suspend_report_result(dev->type->pm->prepare, error); |
| 737 | if (error) |
| 738 | goto End; |
| 739 | } |
| 740 | |
| 741 | if (dev->class && dev->class->pm && dev->class->pm->prepare) { |
| 742 | pm_dev_dbg(dev, state, "preparing class "); |
| 743 | error = dev->class->pm->prepare(dev); |
| 744 | suspend_report_result(dev->class->pm->prepare, error); |
| 745 | } |
| 746 | End: |
| 747 | up(&dev->sem); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 748 | |
| 749 | return error; |
| 750 | } |
| 751 | |
| 752 | /** |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 753 | * dpm_prepare - Prepare all devices for a PM transition. |
| 754 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 755 | * |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 756 | * Execute the ->prepare() callback for all devices. |
| 757 | */ |
| 758 | static int dpm_prepare(pm_message_t state) |
| 759 | { |
| 760 | struct list_head list; |
| 761 | int error = 0; |
| 762 | |
| 763 | INIT_LIST_HEAD(&list); |
| 764 | mutex_lock(&dpm_list_mtx); |
| 765 | transition_started = true; |
| 766 | while (!list_empty(&dpm_list)) { |
| 767 | struct device *dev = to_device(dpm_list.next); |
| 768 | |
| 769 | get_device(dev); |
| 770 | dev->power.status = DPM_PREPARING; |
| 771 | mutex_unlock(&dpm_list_mtx); |
| 772 | |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame^] | 773 | pm_runtime_get_noresume(dev); |
| 774 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) { |
| 775 | /* Wake-up requested during system sleep transition. */ |
| 776 | pm_runtime_put_noidle(dev); |
| 777 | error = -EBUSY; |
| 778 | } else { |
| 779 | error = device_prepare(dev, state); |
| 780 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 781 | |
| 782 | mutex_lock(&dpm_list_mtx); |
| 783 | if (error) { |
| 784 | dev->power.status = DPM_ON; |
| 785 | if (error == -EAGAIN) { |
| 786 | put_device(dev); |
Sebastian Ott | 886a7a3 | 2009-07-08 13:26:05 +0200 | [diff] [blame] | 787 | error = 0; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 788 | continue; |
| 789 | } |
| 790 | printk(KERN_ERR "PM: Failed to prepare device %s " |
| 791 | "for power transition: error %d\n", |
| 792 | kobject_name(&dev->kobj), error); |
| 793 | put_device(dev); |
| 794 | break; |
| 795 | } |
| 796 | dev->power.status = DPM_SUSPENDING; |
| 797 | if (!list_empty(&dev->power.entry)) |
| 798 | list_move_tail(&dev->power.entry, &list); |
| 799 | put_device(dev); |
| 800 | } |
| 801 | list_splice(&list, &dpm_list); |
| 802 | mutex_unlock(&dpm_list_mtx); |
| 803 | return error; |
| 804 | } |
| 805 | |
| 806 | /** |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 807 | * dpm_suspend_start - Save state and stop all devices in system. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 808 | * @state: PM transition of the system being carried out. |
| 809 | * |
| 810 | * Prepare and suspend all devices. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 811 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 812 | int dpm_suspend_start(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 813 | { |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 814 | int error; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 815 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 816 | might_sleep(); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 817 | error = dpm_prepare(state); |
| 818 | if (!error) |
| 819 | error = dpm_suspend(state); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 820 | return error; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 821 | } |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 822 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 823 | |
| 824 | void __suspend_report_result(const char *function, void *fn, int ret) |
| 825 | { |
Bjorn Helgaas | c80cfb0 | 2008-10-15 22:01:35 -0700 | [diff] [blame] | 826 | if (ret) |
| 827 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 828 | } |
| 829 | EXPORT_SYMBOL_GPL(__suspend_report_result); |