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> |
| 24 | #include <linux/resume-trace.h> |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 25 | #include <linux/rwsem.h> |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 26 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 27 | #include "../base.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include "power.h" |
| 29 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 30 | /* |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 31 | * 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] | 32 | * because children are guaranteed to be discovered after parents, and |
| 33 | * are inserted at the back of the list on discovery. |
| 34 | * |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 35 | * Since device_pm_add() may be called with a device semaphore held, |
| 36 | * we must never try to acquire a device semaphore while holding |
| 37 | * dpm_list_mutex. |
| 38 | */ |
| 39 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 40 | LIST_HEAD(dpm_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 42 | static DEFINE_MUTEX(dpm_list_mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 44 | /* |
| 45 | * Set once the preparation of devices for a PM transition has started, reset |
| 46 | * before starting to resume devices. Protected by dpm_list_mtx. |
| 47 | */ |
| 48 | static bool transition_started; |
| 49 | |
| 50 | /** |
| 51 | * device_pm_lock - lock the list of active devices used by the PM core |
| 52 | */ |
| 53 | void device_pm_lock(void) |
| 54 | { |
| 55 | mutex_lock(&dpm_list_mtx); |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * device_pm_unlock - unlock the list of active devices used by the PM core |
| 60 | */ |
| 61 | void device_pm_unlock(void) |
| 62 | { |
| 63 | mutex_unlock(&dpm_list_mtx); |
| 64 | } |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 65 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 66 | /** |
| 67 | * device_pm_add - add a device to the list of active devices |
| 68 | * @dev: Device to be added to the list |
| 69 | */ |
Alan Stern | 3b98aea | 2008-08-07 13:06:12 -0400 | [diff] [blame^] | 70 | void device_pm_add(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | pr_debug("PM: Adding info for %s:%s\n", |
Dmitry Torokhov | c48ea60 | 2007-04-11 01:37:18 -0400 | [diff] [blame] | 73 | dev->bus ? dev->bus->name : "No Bus", |
| 74 | kobject_name(&dev->kobj)); |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 75 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 76 | if (dev->parent) { |
| 77 | if (dev->parent->power.status >= DPM_SUSPENDING) { |
| 78 | dev_warn(dev, "parent %s is sleeping, will not add\n", |
Rafael J. Wysocki | 58aca23 | 2008-03-12 00:57:22 +0100 | [diff] [blame] | 79 | dev->parent->bus_id); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 80 | WARN_ON(true); |
| 81 | } |
| 82 | } else if (transition_started) { |
| 83 | /* |
| 84 | * We refuse to register parentless devices while a PM |
| 85 | * transition is in progress in order to avoid leaving them |
| 86 | * unhandled down the road |
| 87 | */ |
Rafael J. Wysocki | 58aca23 | 2008-03-12 00:57:22 +0100 | [diff] [blame] | 88 | WARN_ON(true); |
Rafael J. Wysocki | 58aca23 | 2008-03-12 00:57:22 +0100 | [diff] [blame] | 89 | } |
Alan Stern | 3b98aea | 2008-08-07 13:06:12 -0400 | [diff] [blame^] | 90 | |
| 91 | list_add_tail(&dev->power.entry, &dpm_list); |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 92 | mutex_unlock(&dpm_list_mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | } |
| 94 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 95 | /** |
| 96 | * device_pm_remove - remove a device from the list of active devices |
| 97 | * @dev: Device to be removed from the list |
| 98 | * |
| 99 | * This function also removes the device's PM-related sysfs attributes. |
| 100 | */ |
Rafael J. Wysocki | 9cddad7 | 2007-06-13 15:53:34 +0200 | [diff] [blame] | 101 | void device_pm_remove(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | { |
| 103 | pr_debug("PM: Removing info for %s:%s\n", |
Dmitry Torokhov | c48ea60 | 2007-04-11 01:37:18 -0400 | [diff] [blame] | 104 | dev->bus ? dev->bus->name : "No Bus", |
| 105 | kobject_name(&dev->kobj)); |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 106 | mutex_lock(&dpm_list_mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | list_del_init(&dev->power.entry); |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 108 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 109 | } |
| 110 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 111 | /** |
| 112 | * pm_op - execute the PM operation appropiate for given PM event |
| 113 | * @dev: Device. |
| 114 | * @ops: PM operations to choose from. |
| 115 | * @state: PM transition of the system being carried out. |
| 116 | */ |
| 117 | static int pm_op(struct device *dev, struct pm_ops *ops, pm_message_t state) |
| 118 | { |
| 119 | int error = 0; |
| 120 | |
| 121 | switch (state.event) { |
| 122 | #ifdef CONFIG_SUSPEND |
| 123 | case PM_EVENT_SUSPEND: |
| 124 | if (ops->suspend) { |
| 125 | error = ops->suspend(dev); |
| 126 | suspend_report_result(ops->suspend, error); |
| 127 | } |
| 128 | break; |
| 129 | case PM_EVENT_RESUME: |
| 130 | if (ops->resume) { |
| 131 | error = ops->resume(dev); |
| 132 | suspend_report_result(ops->resume, error); |
| 133 | } |
| 134 | break; |
| 135 | #endif /* CONFIG_SUSPEND */ |
| 136 | #ifdef CONFIG_HIBERNATION |
| 137 | case PM_EVENT_FREEZE: |
| 138 | case PM_EVENT_QUIESCE: |
| 139 | if (ops->freeze) { |
| 140 | error = ops->freeze(dev); |
| 141 | suspend_report_result(ops->freeze, error); |
| 142 | } |
| 143 | break; |
| 144 | case PM_EVENT_HIBERNATE: |
| 145 | if (ops->poweroff) { |
| 146 | error = ops->poweroff(dev); |
| 147 | suspend_report_result(ops->poweroff, error); |
| 148 | } |
| 149 | break; |
| 150 | case PM_EVENT_THAW: |
| 151 | case PM_EVENT_RECOVER: |
| 152 | if (ops->thaw) { |
| 153 | error = ops->thaw(dev); |
| 154 | suspend_report_result(ops->thaw, error); |
| 155 | } |
| 156 | break; |
| 157 | case PM_EVENT_RESTORE: |
| 158 | if (ops->restore) { |
| 159 | error = ops->restore(dev); |
| 160 | suspend_report_result(ops->restore, error); |
| 161 | } |
| 162 | break; |
| 163 | #endif /* CONFIG_HIBERNATION */ |
| 164 | default: |
| 165 | error = -EINVAL; |
| 166 | } |
| 167 | return error; |
| 168 | } |
| 169 | |
| 170 | /** |
| 171 | * pm_noirq_op - execute the PM operation appropiate for given PM event |
| 172 | * @dev: Device. |
| 173 | * @ops: PM operations to choose from. |
| 174 | * @state: PM transition of the system being carried out. |
| 175 | * |
| 176 | * The operation is executed with interrupts disabled by the only remaining |
| 177 | * functional CPU in the system. |
| 178 | */ |
| 179 | static int pm_noirq_op(struct device *dev, struct pm_ext_ops *ops, |
| 180 | pm_message_t state) |
| 181 | { |
| 182 | int error = 0; |
| 183 | |
| 184 | switch (state.event) { |
| 185 | #ifdef CONFIG_SUSPEND |
| 186 | case PM_EVENT_SUSPEND: |
| 187 | if (ops->suspend_noirq) { |
| 188 | error = ops->suspend_noirq(dev); |
| 189 | suspend_report_result(ops->suspend_noirq, error); |
| 190 | } |
| 191 | break; |
| 192 | case PM_EVENT_RESUME: |
| 193 | if (ops->resume_noirq) { |
| 194 | error = ops->resume_noirq(dev); |
| 195 | suspend_report_result(ops->resume_noirq, error); |
| 196 | } |
| 197 | break; |
| 198 | #endif /* CONFIG_SUSPEND */ |
| 199 | #ifdef CONFIG_HIBERNATION |
| 200 | case PM_EVENT_FREEZE: |
| 201 | case PM_EVENT_QUIESCE: |
| 202 | if (ops->freeze_noirq) { |
| 203 | error = ops->freeze_noirq(dev); |
| 204 | suspend_report_result(ops->freeze_noirq, error); |
| 205 | } |
| 206 | break; |
| 207 | case PM_EVENT_HIBERNATE: |
| 208 | if (ops->poweroff_noirq) { |
| 209 | error = ops->poweroff_noirq(dev); |
| 210 | suspend_report_result(ops->poweroff_noirq, error); |
| 211 | } |
| 212 | break; |
| 213 | case PM_EVENT_THAW: |
| 214 | case PM_EVENT_RECOVER: |
| 215 | if (ops->thaw_noirq) { |
| 216 | error = ops->thaw_noirq(dev); |
| 217 | suspend_report_result(ops->thaw_noirq, error); |
| 218 | } |
| 219 | break; |
| 220 | case PM_EVENT_RESTORE: |
| 221 | if (ops->restore_noirq) { |
| 222 | error = ops->restore_noirq(dev); |
| 223 | suspend_report_result(ops->restore_noirq, error); |
| 224 | } |
| 225 | break; |
| 226 | #endif /* CONFIG_HIBERNATION */ |
| 227 | default: |
| 228 | error = -EINVAL; |
| 229 | } |
| 230 | return error; |
| 231 | } |
| 232 | |
| 233 | static char *pm_verb(int event) |
| 234 | { |
| 235 | switch (event) { |
| 236 | case PM_EVENT_SUSPEND: |
| 237 | return "suspend"; |
| 238 | case PM_EVENT_RESUME: |
| 239 | return "resume"; |
| 240 | case PM_EVENT_FREEZE: |
| 241 | return "freeze"; |
| 242 | case PM_EVENT_QUIESCE: |
| 243 | return "quiesce"; |
| 244 | case PM_EVENT_HIBERNATE: |
| 245 | return "hibernate"; |
| 246 | case PM_EVENT_THAW: |
| 247 | return "thaw"; |
| 248 | case PM_EVENT_RESTORE: |
| 249 | return "restore"; |
| 250 | case PM_EVENT_RECOVER: |
| 251 | return "recover"; |
| 252 | default: |
| 253 | return "(unknown PM event)"; |
| 254 | } |
| 255 | } |
| 256 | |
| 257 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) |
| 258 | { |
| 259 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), |
| 260 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? |
| 261 | ", may wakeup" : ""); |
| 262 | } |
| 263 | |
| 264 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, |
| 265 | int error) |
| 266 | { |
| 267 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", |
| 268 | kobject_name(&dev->kobj), pm_verb(state.event), info, error); |
| 269 | } |
| 270 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 271 | /*------------------------- Resume routines -------------------------*/ |
| 272 | |
| 273 | /** |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 274 | * resume_device_noirq - Power on one device (early resume). |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 275 | * @dev: Device. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 276 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 277 | * |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 278 | * Must be called with interrupts disabled. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 279 | */ |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 280 | static int resume_device_noirq(struct device *dev, pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 281 | { |
| 282 | int error = 0; |
| 283 | |
| 284 | TRACE_DEVICE(dev); |
| 285 | TRACE_RESUME(0); |
| 286 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 287 | if (!dev->bus) |
| 288 | goto End; |
| 289 | |
| 290 | if (dev->bus->pm) { |
| 291 | pm_dev_dbg(dev, state, "EARLY "); |
| 292 | error = pm_noirq_op(dev, dev->bus->pm, state); |
| 293 | } else if (dev->bus->resume_early) { |
| 294 | pm_dev_dbg(dev, state, "legacy EARLY "); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 295 | error = dev->bus->resume_early(dev); |
| 296 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 297 | End: |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 298 | TRACE_RESUME(error); |
| 299 | return error; |
| 300 | } |
| 301 | |
| 302 | /** |
| 303 | * dpm_power_up - Power on all regular (non-sysdev) devices. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 304 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 305 | * |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 306 | * Execute the appropriate "noirq resume" callback for all devices marked |
| 307 | * as DPM_OFF_IRQ. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 308 | * |
| 309 | * Must be called with interrupts disabled and only one CPU running. |
| 310 | */ |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 311 | static void dpm_power_up(pm_message_t state) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 312 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 313 | struct device *dev; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 314 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 315 | list_for_each_entry(dev, &dpm_list, power.entry) |
| 316 | if (dev->power.status > DPM_OFF) { |
| 317 | int error; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 318 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 319 | dev->power.status = DPM_OFF; |
| 320 | error = resume_device_noirq(dev, state); |
| 321 | if (error) |
| 322 | pm_dev_err(dev, state, " early", error); |
| 323 | } |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 324 | } |
| 325 | |
| 326 | /** |
| 327 | * device_power_up - Turn on all devices that need special attention. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 328 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 329 | * |
| 330 | * Power on system devices, then devices that required we shut them down |
| 331 | * with interrupts disabled. |
| 332 | * |
| 333 | * Must be called with interrupts disabled. |
| 334 | */ |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 335 | void device_power_up(pm_message_t state) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 336 | { |
| 337 | sysdev_resume(); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 338 | dpm_power_up(state); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 339 | } |
| 340 | EXPORT_SYMBOL_GPL(device_power_up); |
| 341 | |
| 342 | /** |
| 343 | * resume_device - Restore state for one device. |
| 344 | * @dev: Device. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 345 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 346 | */ |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 347 | static int resume_device(struct device *dev, pm_message_t state) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 348 | { |
| 349 | int error = 0; |
| 350 | |
| 351 | TRACE_DEVICE(dev); |
| 352 | TRACE_RESUME(0); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 353 | |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 354 | down(&dev->sem); |
| 355 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 356 | if (dev->bus) { |
| 357 | if (dev->bus->pm) { |
| 358 | pm_dev_dbg(dev, state, ""); |
| 359 | error = pm_op(dev, &dev->bus->pm->base, state); |
| 360 | } else if (dev->bus->resume) { |
| 361 | pm_dev_dbg(dev, state, "legacy "); |
| 362 | error = dev->bus->resume(dev); |
| 363 | } |
| 364 | if (error) |
| 365 | goto End; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 366 | } |
| 367 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 368 | if (dev->type) { |
| 369 | if (dev->type->pm) { |
| 370 | pm_dev_dbg(dev, state, "type "); |
| 371 | error = pm_op(dev, dev->type->pm, state); |
| 372 | } else if (dev->type->resume) { |
| 373 | pm_dev_dbg(dev, state, "legacy type "); |
| 374 | error = dev->type->resume(dev); |
| 375 | } |
| 376 | if (error) |
| 377 | goto End; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 378 | } |
| 379 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 380 | if (dev->class) { |
| 381 | if (dev->class->pm) { |
| 382 | pm_dev_dbg(dev, state, "class "); |
| 383 | error = pm_op(dev, dev->class->pm, state); |
| 384 | } else if (dev->class->resume) { |
| 385 | pm_dev_dbg(dev, state, "legacy class "); |
| 386 | error = dev->class->resume(dev); |
| 387 | } |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 388 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 389 | End: |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 390 | up(&dev->sem); |
| 391 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 392 | TRACE_RESUME(error); |
| 393 | return error; |
| 394 | } |
| 395 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 396 | /** |
| 397 | * dpm_resume - Resume every device. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 398 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 399 | * |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 400 | * Execute the appropriate "resume" callback for all devices the status of |
| 401 | * which indicates that they are inactive. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 402 | */ |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 403 | static void dpm_resume(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 404 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 405 | struct list_head list; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 406 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 407 | INIT_LIST_HEAD(&list); |
| 408 | mutex_lock(&dpm_list_mtx); |
| 409 | transition_started = false; |
| 410 | while (!list_empty(&dpm_list)) { |
| 411 | struct device *dev = to_device(dpm_list.next); |
| 412 | |
| 413 | get_device(dev); |
| 414 | if (dev->power.status >= DPM_OFF) { |
| 415 | int error; |
| 416 | |
| 417 | dev->power.status = DPM_RESUMING; |
| 418 | mutex_unlock(&dpm_list_mtx); |
| 419 | |
| 420 | error = resume_device(dev, state); |
| 421 | |
| 422 | mutex_lock(&dpm_list_mtx); |
| 423 | if (error) |
| 424 | pm_dev_err(dev, state, "", error); |
| 425 | } else if (dev->power.status == DPM_SUSPENDING) { |
| 426 | /* Allow new children of the device to be registered */ |
| 427 | dev->power.status = DPM_RESUMING; |
| 428 | } |
| 429 | if (!list_empty(&dev->power.entry)) |
| 430 | list_move_tail(&dev->power.entry, &list); |
| 431 | put_device(dev); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 432 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 433 | list_splice(&list, &dpm_list); |
| 434 | mutex_unlock(&dpm_list_mtx); |
| 435 | } |
| 436 | |
| 437 | /** |
| 438 | * complete_device - Complete a PM transition for given device |
| 439 | * @dev: Device. |
| 440 | * @state: PM transition of the system being carried out. |
| 441 | */ |
| 442 | static void complete_device(struct device *dev, pm_message_t state) |
| 443 | { |
| 444 | down(&dev->sem); |
| 445 | |
| 446 | if (dev->class && dev->class->pm && dev->class->pm->complete) { |
| 447 | pm_dev_dbg(dev, state, "completing class "); |
| 448 | dev->class->pm->complete(dev); |
| 449 | } |
| 450 | |
| 451 | if (dev->type && dev->type->pm && dev->type->pm->complete) { |
| 452 | pm_dev_dbg(dev, state, "completing type "); |
| 453 | dev->type->pm->complete(dev); |
| 454 | } |
| 455 | |
| 456 | if (dev->bus && dev->bus->pm && dev->bus->pm->base.complete) { |
| 457 | pm_dev_dbg(dev, state, "completing "); |
| 458 | dev->bus->pm->base.complete(dev); |
| 459 | } |
| 460 | |
| 461 | up(&dev->sem); |
| 462 | } |
| 463 | |
| 464 | /** |
| 465 | * dpm_complete - Complete a PM transition for all devices. |
| 466 | * @state: PM transition of the system being carried out. |
| 467 | * |
| 468 | * Execute the ->complete() callbacks for all devices that are not marked |
| 469 | * as DPM_ON. |
| 470 | */ |
| 471 | static void dpm_complete(pm_message_t state) |
| 472 | { |
| 473 | struct list_head list; |
| 474 | |
| 475 | INIT_LIST_HEAD(&list); |
| 476 | mutex_lock(&dpm_list_mtx); |
| 477 | while (!list_empty(&dpm_list)) { |
| 478 | struct device *dev = to_device(dpm_list.prev); |
| 479 | |
| 480 | get_device(dev); |
| 481 | if (dev->power.status > DPM_ON) { |
| 482 | dev->power.status = DPM_ON; |
| 483 | mutex_unlock(&dpm_list_mtx); |
| 484 | |
| 485 | complete_device(dev, state); |
| 486 | |
| 487 | mutex_lock(&dpm_list_mtx); |
| 488 | } |
| 489 | if (!list_empty(&dev->power.entry)) |
| 490 | list_move(&dev->power.entry, &list); |
| 491 | put_device(dev); |
| 492 | } |
| 493 | list_splice(&list, &dpm_list); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 494 | mutex_unlock(&dpm_list_mtx); |
| 495 | } |
| 496 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 497 | /** |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 498 | * device_resume - Restore state of each device in system. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 499 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 500 | * |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 501 | * Resume all the devices, unlock them all, and allow new |
| 502 | * devices to be registered once again. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 503 | */ |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 504 | void device_resume(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 505 | { |
| 506 | might_sleep(); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 507 | dpm_resume(state); |
| 508 | dpm_complete(state); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 509 | } |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 510 | EXPORT_SYMBOL_GPL(device_resume); |
| 511 | |
| 512 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 513 | /*------------------------- Suspend routines -------------------------*/ |
| 514 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 515 | /** |
| 516 | * resume_event - return a PM message representing the resume event |
| 517 | * corresponding to given sleep state. |
| 518 | * @sleep_state: PM message representing a sleep state. |
| 519 | */ |
| 520 | static pm_message_t resume_event(pm_message_t sleep_state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 521 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 522 | switch (sleep_state.event) { |
| 523 | case PM_EVENT_SUSPEND: |
| 524 | return PMSG_RESUME; |
| 525 | case PM_EVENT_FREEZE: |
| 526 | case PM_EVENT_QUIESCE: |
| 527 | return PMSG_RECOVER; |
| 528 | case PM_EVENT_HIBERNATE: |
| 529 | return PMSG_RESTORE; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 530 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 531 | return PMSG_ON; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 532 | } |
| 533 | |
| 534 | /** |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 535 | * suspend_device_noirq - Shut down one device (late suspend). |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 536 | * @dev: Device. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 537 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 538 | * |
| 539 | * This is called with interrupts off and only a single CPU running. |
| 540 | */ |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 541 | static int suspend_device_noirq(struct device *dev, pm_message_t state) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 542 | { |
| 543 | int error = 0; |
| 544 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 545 | if (!dev->bus) |
| 546 | return 0; |
| 547 | |
| 548 | if (dev->bus->pm) { |
| 549 | pm_dev_dbg(dev, state, "LATE "); |
| 550 | error = pm_noirq_op(dev, dev->bus->pm, state); |
| 551 | } else if (dev->bus->suspend_late) { |
| 552 | pm_dev_dbg(dev, state, "legacy LATE "); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 553 | error = dev->bus->suspend_late(dev, state); |
| 554 | suspend_report_result(dev->bus->suspend_late, error); |
| 555 | } |
| 556 | return error; |
| 557 | } |
| 558 | |
| 559 | /** |
| 560 | * device_power_down - Shut down special devices. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 561 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 562 | * |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 563 | * Power down devices that require interrupts to be disabled. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 564 | * Then power down system devices. |
| 565 | * |
| 566 | * Must be called with interrupts disabled and only one CPU running. |
| 567 | */ |
| 568 | int device_power_down(pm_message_t state) |
| 569 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 570 | struct device *dev; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 571 | int error = 0; |
| 572 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 573 | list_for_each_entry_reverse(dev, &dpm_list, power.entry) { |
| 574 | error = suspend_device_noirq(dev, state); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 575 | if (error) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 576 | pm_dev_err(dev, state, " late", error); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 577 | break; |
| 578 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 579 | dev->power.status = DPM_OFF_IRQ; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 580 | } |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 581 | if (!error) |
| 582 | error = sysdev_suspend(state); |
| 583 | if (error) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 584 | dpm_power_up(resume_event(state)); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 585 | return error; |
| 586 | } |
| 587 | EXPORT_SYMBOL_GPL(device_power_down); |
| 588 | |
| 589 | /** |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 590 | * suspend_device - Save state of one device. |
| 591 | * @dev: Device. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 592 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 593 | */ |
Adrian Bunk | 19e20c9 | 2008-02-03 22:55:18 +0100 | [diff] [blame] | 594 | static int suspend_device(struct device *dev, pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 595 | { |
| 596 | int error = 0; |
| 597 | |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 598 | down(&dev->sem); |
| 599 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 600 | if (dev->class) { |
| 601 | if (dev->class->pm) { |
| 602 | pm_dev_dbg(dev, state, "class "); |
| 603 | error = pm_op(dev, dev->class->pm, state); |
| 604 | } else if (dev->class->suspend) { |
| 605 | pm_dev_dbg(dev, state, "legacy class "); |
| 606 | error = dev->class->suspend(dev, state); |
| 607 | suspend_report_result(dev->class->suspend, error); |
| 608 | } |
| 609 | if (error) |
| 610 | goto End; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 611 | } |
| 612 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 613 | if (dev->type) { |
| 614 | if (dev->type->pm) { |
| 615 | pm_dev_dbg(dev, state, "type "); |
| 616 | error = pm_op(dev, dev->type->pm, state); |
| 617 | } else if (dev->type->suspend) { |
| 618 | pm_dev_dbg(dev, state, "legacy type "); |
| 619 | error = dev->type->suspend(dev, state); |
| 620 | suspend_report_result(dev->type->suspend, error); |
| 621 | } |
| 622 | if (error) |
| 623 | goto End; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 624 | } |
| 625 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 626 | if (dev->bus) { |
| 627 | if (dev->bus->pm) { |
| 628 | pm_dev_dbg(dev, state, ""); |
| 629 | error = pm_op(dev, &dev->bus->pm->base, state); |
| 630 | } else if (dev->bus->suspend) { |
| 631 | pm_dev_dbg(dev, state, "legacy "); |
| 632 | error = dev->bus->suspend(dev, state); |
| 633 | suspend_report_result(dev->bus->suspend, error); |
| 634 | } |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 635 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 636 | End: |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 637 | up(&dev->sem); |
| 638 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 639 | return error; |
| 640 | } |
| 641 | |
| 642 | /** |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 643 | * dpm_suspend - Suspend every device. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 644 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 645 | * |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 646 | * Execute the appropriate "suspend" callbacks for all devices. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 647 | */ |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 648 | static int dpm_suspend(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 649 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 650 | struct list_head list; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 651 | int error = 0; |
| 652 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 653 | INIT_LIST_HEAD(&list); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 654 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 655 | while (!list_empty(&dpm_list)) { |
| 656 | struct device *dev = to_device(dpm_list.prev); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 657 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 658 | get_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 659 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 660 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 661 | error = suspend_device(dev, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 662 | |
Alan Stern | 1b3cbec | 2008-02-29 11:50:22 -0500 | [diff] [blame] | 663 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 664 | if (error) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 665 | pm_dev_err(dev, state, "", error); |
| 666 | put_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 667 | break; |
| 668 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 669 | dev->power.status = DPM_OFF; |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 670 | if (!list_empty(&dev->power.entry)) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 671 | list_move(&dev->power.entry, &list); |
| 672 | put_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 673 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 674 | list_splice(&list, dpm_list.prev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 675 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 676 | return error; |
| 677 | } |
| 678 | |
| 679 | /** |
| 680 | * prepare_device - Execute the ->prepare() callback(s) for given device. |
| 681 | * @dev: Device. |
| 682 | * @state: PM transition of the system being carried out. |
| 683 | */ |
| 684 | static int prepare_device(struct device *dev, pm_message_t state) |
| 685 | { |
| 686 | int error = 0; |
| 687 | |
| 688 | down(&dev->sem); |
| 689 | |
| 690 | if (dev->bus && dev->bus->pm && dev->bus->pm->base.prepare) { |
| 691 | pm_dev_dbg(dev, state, "preparing "); |
| 692 | error = dev->bus->pm->base.prepare(dev); |
| 693 | suspend_report_result(dev->bus->pm->base.prepare, error); |
| 694 | if (error) |
| 695 | goto End; |
| 696 | } |
| 697 | |
| 698 | if (dev->type && dev->type->pm && dev->type->pm->prepare) { |
| 699 | pm_dev_dbg(dev, state, "preparing type "); |
| 700 | error = dev->type->pm->prepare(dev); |
| 701 | suspend_report_result(dev->type->pm->prepare, error); |
| 702 | if (error) |
| 703 | goto End; |
| 704 | } |
| 705 | |
| 706 | if (dev->class && dev->class->pm && dev->class->pm->prepare) { |
| 707 | pm_dev_dbg(dev, state, "preparing class "); |
| 708 | error = dev->class->pm->prepare(dev); |
| 709 | suspend_report_result(dev->class->pm->prepare, error); |
| 710 | } |
| 711 | End: |
| 712 | up(&dev->sem); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 713 | |
| 714 | return error; |
| 715 | } |
| 716 | |
| 717 | /** |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 718 | * dpm_prepare - Prepare all devices for a PM transition. |
| 719 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 720 | * |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 721 | * Execute the ->prepare() callback for all devices. |
| 722 | */ |
| 723 | static int dpm_prepare(pm_message_t state) |
| 724 | { |
| 725 | struct list_head list; |
| 726 | int error = 0; |
| 727 | |
| 728 | INIT_LIST_HEAD(&list); |
| 729 | mutex_lock(&dpm_list_mtx); |
| 730 | transition_started = true; |
| 731 | while (!list_empty(&dpm_list)) { |
| 732 | struct device *dev = to_device(dpm_list.next); |
| 733 | |
| 734 | get_device(dev); |
| 735 | dev->power.status = DPM_PREPARING; |
| 736 | mutex_unlock(&dpm_list_mtx); |
| 737 | |
| 738 | error = prepare_device(dev, state); |
| 739 | |
| 740 | mutex_lock(&dpm_list_mtx); |
| 741 | if (error) { |
| 742 | dev->power.status = DPM_ON; |
| 743 | if (error == -EAGAIN) { |
| 744 | put_device(dev); |
| 745 | continue; |
| 746 | } |
| 747 | printk(KERN_ERR "PM: Failed to prepare device %s " |
| 748 | "for power transition: error %d\n", |
| 749 | kobject_name(&dev->kobj), error); |
| 750 | put_device(dev); |
| 751 | break; |
| 752 | } |
| 753 | dev->power.status = DPM_SUSPENDING; |
| 754 | if (!list_empty(&dev->power.entry)) |
| 755 | list_move_tail(&dev->power.entry, &list); |
| 756 | put_device(dev); |
| 757 | } |
| 758 | list_splice(&list, &dpm_list); |
| 759 | mutex_unlock(&dpm_list_mtx); |
| 760 | return error; |
| 761 | } |
| 762 | |
| 763 | /** |
| 764 | * device_suspend - Save state and stop all devices in system. |
| 765 | * @state: PM transition of the system being carried out. |
| 766 | * |
| 767 | * Prepare and suspend all devices. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 768 | */ |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 769 | int device_suspend(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 770 | { |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 771 | int error; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 772 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 773 | might_sleep(); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 774 | error = dpm_prepare(state); |
| 775 | if (!error) |
| 776 | error = dpm_suspend(state); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 777 | return error; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 778 | } |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 779 | EXPORT_SYMBOL_GPL(device_suspend); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 780 | |
| 781 | void __suspend_report_result(const char *function, void *fn, int ret) |
| 782 | { |
| 783 | if (ret) { |
| 784 | printk(KERN_ERR "%s(): ", function); |
Linus Torvalds | a442ac5 | 2008-05-15 17:50:37 -0700 | [diff] [blame] | 785 | print_fn_descriptor_symbol("%s returns ", fn); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 786 | printk("%d\n", ret); |
| 787 | } |
| 788 | } |
| 789 | EXPORT_SYMBOL_GPL(__suspend_report_result); |