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> |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame^] | 28 | #include <linux/sched.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 | * |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 38 | * Since device_pm_add() may be called with a device semaphore held, |
| 39 | * we must never try to acquire a device semaphore while holding |
| 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 47 | /* |
| 48 | * Set once the preparation of devices for a PM transition has started, reset |
| 49 | * before starting to resume devices. Protected by dpm_list_mtx. |
| 50 | */ |
| 51 | static bool transition_started; |
| 52 | |
| 53 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 54 | * 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] | 55 | * @dev: Device object being initialized. |
| 56 | */ |
| 57 | void device_pm_init(struct device *dev) |
| 58 | { |
| 59 | dev->power.status = DPM_ON; |
| 60 | pm_runtime_init(dev); |
| 61 | } |
| 62 | |
| 63 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 64 | * 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] | 65 | */ |
| 66 | void device_pm_lock(void) |
| 67 | { |
| 68 | mutex_lock(&dpm_list_mtx); |
| 69 | } |
| 70 | |
| 71 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 72 | * 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] | 73 | */ |
| 74 | void device_pm_unlock(void) |
| 75 | { |
| 76 | mutex_unlock(&dpm_list_mtx); |
| 77 | } |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 78 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 79 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 80 | * device_pm_add - Add a device to the PM core's list of active devices. |
| 81 | * @dev: Device to add to the list. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 82 | */ |
Alan Stern | 3b98aea | 2008-08-07 13:06:12 -0400 | [diff] [blame] | 83 | void device_pm_add(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | pr_debug("PM: Adding info for %s:%s\n", |
Dmitry Torokhov | c48ea60 | 2007-04-11 01:37:18 -0400 | [diff] [blame] | 86 | dev->bus ? dev->bus->name : "No Bus", |
| 87 | kobject_name(&dev->kobj)); |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 88 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 89 | if (dev->parent) { |
Rafael J. Wysocki | f5a6d95 | 2008-08-09 01:05:13 +0200 | [diff] [blame] | 90 | if (dev->parent->power.status >= DPM_SUSPENDING) |
| 91 | dev_warn(dev, "parent %s should not be sleeping\n", |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 92 | dev_name(dev->parent)); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 93 | } else if (transition_started) { |
| 94 | /* |
| 95 | * We refuse to register parentless devices while a PM |
| 96 | * transition is in progress in order to avoid leaving them |
| 97 | * unhandled down the road |
| 98 | */ |
Arjan van de Ven | 728f089 | 2008-09-20 19:09:00 -0700 | [diff] [blame] | 99 | dev_WARN(dev, "Parentless device registered during a PM transaction\n"); |
Rafael J. Wysocki | 58aca23 | 2008-03-12 00:57:22 +0100 | [diff] [blame] | 100 | } |
Alan Stern | 3b98aea | 2008-08-07 13:06:12 -0400 | [diff] [blame] | 101 | |
| 102 | list_add_tail(&dev->power.entry, &dpm_list); |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 103 | mutex_unlock(&dpm_list_mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | } |
| 105 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 106 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 107 | * device_pm_remove - Remove a device from the PM core's list of active devices. |
| 108 | * @dev: Device to be removed from the list. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 109 | */ |
Rafael J. Wysocki | 9cddad7 | 2007-06-13 15:53:34 +0200 | [diff] [blame] | 110 | void device_pm_remove(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | { |
| 112 | pr_debug("PM: Removing info for %s:%s\n", |
Dmitry Torokhov | c48ea60 | 2007-04-11 01:37:18 -0400 | [diff] [blame] | 113 | dev->bus ? dev->bus->name : "No Bus", |
| 114 | kobject_name(&dev->kobj)); |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 115 | mutex_lock(&dpm_list_mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | list_del_init(&dev->power.entry); |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 117 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 118 | pm_runtime_remove(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 119 | } |
| 120 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 121 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 122 | * device_pm_move_before - Move device in the PM core's list of active devices. |
| 123 | * @deva: Device to move in dpm_list. |
| 124 | * @devb: Device @deva should come before. |
Cornelia Huck | ffa6a70 | 2009-03-04 12:44:00 +0100 | [diff] [blame] | 125 | */ |
| 126 | void device_pm_move_before(struct device *deva, struct device *devb) |
| 127 | { |
| 128 | pr_debug("PM: Moving %s:%s before %s:%s\n", |
| 129 | deva->bus ? deva->bus->name : "No Bus", |
| 130 | kobject_name(&deva->kobj), |
| 131 | devb->bus ? devb->bus->name : "No Bus", |
| 132 | kobject_name(&devb->kobj)); |
| 133 | /* Delete deva from dpm_list and reinsert before devb. */ |
| 134 | list_move_tail(&deva->power.entry, &devb->power.entry); |
| 135 | } |
| 136 | |
| 137 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 138 | * device_pm_move_after - Move device in the PM core's list of active devices. |
| 139 | * @deva: Device to move in dpm_list. |
| 140 | * @devb: Device @deva should come after. |
Cornelia Huck | ffa6a70 | 2009-03-04 12:44:00 +0100 | [diff] [blame] | 141 | */ |
| 142 | void device_pm_move_after(struct device *deva, struct device *devb) |
| 143 | { |
| 144 | pr_debug("PM: Moving %s:%s after %s:%s\n", |
| 145 | deva->bus ? deva->bus->name : "No Bus", |
| 146 | kobject_name(&deva->kobj), |
| 147 | devb->bus ? devb->bus->name : "No Bus", |
| 148 | kobject_name(&devb->kobj)); |
| 149 | /* Delete deva from dpm_list and reinsert after devb. */ |
| 150 | list_move(&deva->power.entry, &devb->power.entry); |
| 151 | } |
| 152 | |
| 153 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 154 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
| 155 | * @dev: Device to move in dpm_list. |
Cornelia Huck | ffa6a70 | 2009-03-04 12:44:00 +0100 | [diff] [blame] | 156 | */ |
| 157 | void device_pm_move_last(struct device *dev) |
| 158 | { |
| 159 | pr_debug("PM: Moving %s:%s to end of list\n", |
| 160 | dev->bus ? dev->bus->name : "No Bus", |
| 161 | kobject_name(&dev->kobj)); |
| 162 | list_move_tail(&dev->power.entry, &dpm_list); |
| 163 | } |
| 164 | |
| 165 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 166 | * pm_op - Execute the PM operation appropriate for given PM event. |
| 167 | * @dev: Device to handle. |
| 168 | * @ops: PM operations to choose from. |
| 169 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 170 | */ |
Dmitry Torokhov | d9ab771 | 2009-07-22 00:37:25 +0200 | [diff] [blame] | 171 | static int pm_op(struct device *dev, |
| 172 | const struct dev_pm_ops *ops, |
| 173 | pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 174 | { |
| 175 | int error = 0; |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame^] | 176 | ktime_t calltime, delta, rettime; |
| 177 | |
| 178 | if (initcall_debug) { |
| 179 | pr_info("calling %s+ @ %i\n", |
| 180 | dev_name(dev), task_pid_nr(current)); |
| 181 | calltime = ktime_get(); |
| 182 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 183 | |
| 184 | switch (state.event) { |
| 185 | #ifdef CONFIG_SUSPEND |
| 186 | case PM_EVENT_SUSPEND: |
| 187 | if (ops->suspend) { |
| 188 | error = ops->suspend(dev); |
| 189 | suspend_report_result(ops->suspend, error); |
| 190 | } |
| 191 | break; |
| 192 | case PM_EVENT_RESUME: |
| 193 | if (ops->resume) { |
| 194 | error = ops->resume(dev); |
| 195 | suspend_report_result(ops->resume, 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) { |
| 203 | error = ops->freeze(dev); |
| 204 | suspend_report_result(ops->freeze, error); |
| 205 | } |
| 206 | break; |
| 207 | case PM_EVENT_HIBERNATE: |
| 208 | if (ops->poweroff) { |
| 209 | error = ops->poweroff(dev); |
| 210 | suspend_report_result(ops->poweroff, error); |
| 211 | } |
| 212 | break; |
| 213 | case PM_EVENT_THAW: |
| 214 | case PM_EVENT_RECOVER: |
| 215 | if (ops->thaw) { |
| 216 | error = ops->thaw(dev); |
| 217 | suspend_report_result(ops->thaw, error); |
| 218 | } |
| 219 | break; |
| 220 | case PM_EVENT_RESTORE: |
| 221 | if (ops->restore) { |
| 222 | error = ops->restore(dev); |
| 223 | suspend_report_result(ops->restore, error); |
| 224 | } |
| 225 | break; |
| 226 | #endif /* CONFIG_HIBERNATION */ |
| 227 | default: |
| 228 | error = -EINVAL; |
| 229 | } |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame^] | 230 | |
| 231 | if (initcall_debug) { |
| 232 | rettime = ktime_get(); |
| 233 | delta = ktime_sub(rettime, calltime); |
| 234 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), |
| 235 | error, (unsigned long long)ktime_to_ns(delta) >> 10); |
| 236 | } |
| 237 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 238 | return error; |
| 239 | } |
| 240 | |
| 241 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 242 | * pm_noirq_op - Execute the PM operation appropriate for given PM event. |
| 243 | * @dev: Device to handle. |
| 244 | * @ops: PM operations to choose from. |
| 245 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 246 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 247 | * The driver of @dev will not receive interrupts while this function is being |
| 248 | * executed. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 249 | */ |
Dmitry Torokhov | d9ab771 | 2009-07-22 00:37:25 +0200 | [diff] [blame] | 250 | static int pm_noirq_op(struct device *dev, |
| 251 | const struct dev_pm_ops *ops, |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 252 | pm_message_t state) |
| 253 | { |
| 254 | int error = 0; |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame^] | 255 | ktime_t calltime, delta, rettime; |
| 256 | |
| 257 | if (initcall_debug) { |
| 258 | pr_info("calling %s_i+ @ %i\n", |
| 259 | dev_name(dev), task_pid_nr(current)); |
| 260 | calltime = ktime_get(); |
| 261 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 262 | |
| 263 | switch (state.event) { |
| 264 | #ifdef CONFIG_SUSPEND |
| 265 | case PM_EVENT_SUSPEND: |
| 266 | if (ops->suspend_noirq) { |
| 267 | error = ops->suspend_noirq(dev); |
| 268 | suspend_report_result(ops->suspend_noirq, error); |
| 269 | } |
| 270 | break; |
| 271 | case PM_EVENT_RESUME: |
| 272 | if (ops->resume_noirq) { |
| 273 | error = ops->resume_noirq(dev); |
| 274 | suspend_report_result(ops->resume_noirq, error); |
| 275 | } |
| 276 | break; |
| 277 | #endif /* CONFIG_SUSPEND */ |
| 278 | #ifdef CONFIG_HIBERNATION |
| 279 | case PM_EVENT_FREEZE: |
| 280 | case PM_EVENT_QUIESCE: |
| 281 | if (ops->freeze_noirq) { |
| 282 | error = ops->freeze_noirq(dev); |
| 283 | suspend_report_result(ops->freeze_noirq, error); |
| 284 | } |
| 285 | break; |
| 286 | case PM_EVENT_HIBERNATE: |
| 287 | if (ops->poweroff_noirq) { |
| 288 | error = ops->poweroff_noirq(dev); |
| 289 | suspend_report_result(ops->poweroff_noirq, error); |
| 290 | } |
| 291 | break; |
| 292 | case PM_EVENT_THAW: |
| 293 | case PM_EVENT_RECOVER: |
| 294 | if (ops->thaw_noirq) { |
| 295 | error = ops->thaw_noirq(dev); |
| 296 | suspend_report_result(ops->thaw_noirq, error); |
| 297 | } |
| 298 | break; |
| 299 | case PM_EVENT_RESTORE: |
| 300 | if (ops->restore_noirq) { |
| 301 | error = ops->restore_noirq(dev); |
| 302 | suspend_report_result(ops->restore_noirq, error); |
| 303 | } |
| 304 | break; |
| 305 | #endif /* CONFIG_HIBERNATION */ |
| 306 | default: |
| 307 | error = -EINVAL; |
| 308 | } |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame^] | 309 | |
| 310 | if (initcall_debug) { |
| 311 | rettime = ktime_get(); |
| 312 | delta = ktime_sub(rettime, calltime); |
| 313 | printk("initcall %s_i+ returned %d after %Ld usecs\n", dev_name(dev), |
| 314 | error, (unsigned long long)ktime_to_ns(delta) >> 10); |
| 315 | } |
| 316 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 317 | return error; |
| 318 | } |
| 319 | |
| 320 | static char *pm_verb(int event) |
| 321 | { |
| 322 | switch (event) { |
| 323 | case PM_EVENT_SUSPEND: |
| 324 | return "suspend"; |
| 325 | case PM_EVENT_RESUME: |
| 326 | return "resume"; |
| 327 | case PM_EVENT_FREEZE: |
| 328 | return "freeze"; |
| 329 | case PM_EVENT_QUIESCE: |
| 330 | return "quiesce"; |
| 331 | case PM_EVENT_HIBERNATE: |
| 332 | return "hibernate"; |
| 333 | case PM_EVENT_THAW: |
| 334 | return "thaw"; |
| 335 | case PM_EVENT_RESTORE: |
| 336 | return "restore"; |
| 337 | case PM_EVENT_RECOVER: |
| 338 | return "recover"; |
| 339 | default: |
| 340 | return "(unknown PM event)"; |
| 341 | } |
| 342 | } |
| 343 | |
| 344 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) |
| 345 | { |
| 346 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), |
| 347 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? |
| 348 | ", may wakeup" : ""); |
| 349 | } |
| 350 | |
| 351 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, |
| 352 | int error) |
| 353 | { |
| 354 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", |
| 355 | kobject_name(&dev->kobj), pm_verb(state.event), info, error); |
| 356 | } |
| 357 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 358 | /*------------------------- Resume routines -------------------------*/ |
| 359 | |
| 360 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 361 | * device_resume_noirq - Execute an "early resume" callback for given device. |
| 362 | * @dev: Device to handle. |
| 363 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 364 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 365 | * The driver of @dev will not receive interrupts while this function is being |
| 366 | * executed. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 367 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 368 | static int device_resume_noirq(struct device *dev, pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 369 | { |
| 370 | int error = 0; |
| 371 | |
| 372 | TRACE_DEVICE(dev); |
| 373 | TRACE_RESUME(0); |
| 374 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 375 | if (!dev->bus) |
| 376 | goto End; |
| 377 | |
| 378 | if (dev->bus->pm) { |
| 379 | pm_dev_dbg(dev, state, "EARLY "); |
| 380 | error = pm_noirq_op(dev, dev->bus->pm, state); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 381 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 382 | End: |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 383 | TRACE_RESUME(error); |
| 384 | return error; |
| 385 | } |
| 386 | |
| 387 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 388 | * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices. |
| 389 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 390 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 391 | * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and |
| 392 | * enable device drivers to receive interrupts. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 393 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 394 | void dpm_resume_noirq(pm_message_t state) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 395 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 396 | struct device *dev; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 397 | |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 398 | mutex_lock(&dpm_list_mtx); |
Xiaotian Feng | 3eb132c | 2009-08-20 20:28:33 +0200 | [diff] [blame] | 399 | transition_started = false; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 400 | list_for_each_entry(dev, &dpm_list, power.entry) |
| 401 | if (dev->power.status > DPM_OFF) { |
| 402 | int error; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 403 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 404 | dev->power.status = DPM_OFF; |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 405 | error = device_resume_noirq(dev, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 406 | if (error) |
| 407 | pm_dev_err(dev, state, " early", error); |
| 408 | } |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 409 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 2ed8d2b | 2009-03-16 22:34:06 +0100 | [diff] [blame] | 410 | resume_device_irqs(); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 411 | } |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 412 | EXPORT_SYMBOL_GPL(dpm_resume_noirq); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 413 | |
| 414 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 415 | * device_resume - Execute "resume" callbacks for given device. |
| 416 | * @dev: Device to handle. |
| 417 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 418 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 419 | static int device_resume(struct device *dev, pm_message_t state) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 420 | { |
| 421 | int error = 0; |
| 422 | |
| 423 | TRACE_DEVICE(dev); |
| 424 | TRACE_RESUME(0); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 425 | |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 426 | down(&dev->sem); |
| 427 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 428 | if (dev->bus) { |
| 429 | if (dev->bus->pm) { |
| 430 | pm_dev_dbg(dev, state, ""); |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 431 | error = pm_op(dev, dev->bus->pm, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 432 | } else if (dev->bus->resume) { |
| 433 | pm_dev_dbg(dev, state, "legacy "); |
| 434 | error = dev->bus->resume(dev); |
| 435 | } |
| 436 | if (error) |
| 437 | goto End; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 438 | } |
| 439 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 440 | if (dev->type) { |
| 441 | if (dev->type->pm) { |
| 442 | pm_dev_dbg(dev, state, "type "); |
| 443 | error = pm_op(dev, dev->type->pm, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 444 | } |
| 445 | if (error) |
| 446 | goto End; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 447 | } |
| 448 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 449 | if (dev->class) { |
| 450 | if (dev->class->pm) { |
| 451 | pm_dev_dbg(dev, state, "class "); |
| 452 | error = pm_op(dev, dev->class->pm, state); |
| 453 | } else if (dev->class->resume) { |
| 454 | pm_dev_dbg(dev, state, "legacy class "); |
| 455 | error = dev->class->resume(dev); |
| 456 | } |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 457 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 458 | End: |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 459 | up(&dev->sem); |
| 460 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 461 | TRACE_RESUME(error); |
| 462 | return error; |
| 463 | } |
| 464 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 465 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 466 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
| 467 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 468 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 469 | * Execute the appropriate "resume" callback for all devices whose status |
| 470 | * indicates that they are suspended. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 471 | */ |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 472 | static void dpm_resume(pm_message_t state) |
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 | struct list_head list; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 475 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 476 | INIT_LIST_HEAD(&list); |
| 477 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 478 | while (!list_empty(&dpm_list)) { |
| 479 | struct device *dev = to_device(dpm_list.next); |
| 480 | |
| 481 | get_device(dev); |
| 482 | if (dev->power.status >= DPM_OFF) { |
| 483 | int error; |
| 484 | |
| 485 | dev->power.status = DPM_RESUMING; |
| 486 | mutex_unlock(&dpm_list_mtx); |
| 487 | |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 488 | error = device_resume(dev, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 489 | |
| 490 | mutex_lock(&dpm_list_mtx); |
| 491 | if (error) |
| 492 | pm_dev_err(dev, state, "", error); |
| 493 | } else if (dev->power.status == DPM_SUSPENDING) { |
| 494 | /* Allow new children of the device to be registered */ |
| 495 | dev->power.status = DPM_RESUMING; |
| 496 | } |
| 497 | if (!list_empty(&dev->power.entry)) |
| 498 | list_move_tail(&dev->power.entry, &list); |
| 499 | put_device(dev); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 500 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 501 | list_splice(&list, &dpm_list); |
| 502 | mutex_unlock(&dpm_list_mtx); |
| 503 | } |
| 504 | |
| 505 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 506 | * device_complete - Complete a PM transition for given device. |
| 507 | * @dev: Device to handle. |
| 508 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 509 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 510 | static void device_complete(struct device *dev, pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 511 | { |
| 512 | down(&dev->sem); |
| 513 | |
| 514 | if (dev->class && dev->class->pm && dev->class->pm->complete) { |
| 515 | pm_dev_dbg(dev, state, "completing class "); |
| 516 | dev->class->pm->complete(dev); |
| 517 | } |
| 518 | |
| 519 | if (dev->type && dev->type->pm && dev->type->pm->complete) { |
| 520 | pm_dev_dbg(dev, state, "completing type "); |
| 521 | dev->type->pm->complete(dev); |
| 522 | } |
| 523 | |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 524 | if (dev->bus && dev->bus->pm && dev->bus->pm->complete) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 525 | pm_dev_dbg(dev, state, "completing "); |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 526 | dev->bus->pm->complete(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 527 | } |
| 528 | |
| 529 | up(&dev->sem); |
| 530 | } |
| 531 | |
| 532 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 533 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
| 534 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 535 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 536 | * Execute the ->complete() callbacks for all devices whose PM status is not |
| 537 | * DPM_ON (this allows new devices to be registered). |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 538 | */ |
| 539 | static void dpm_complete(pm_message_t state) |
| 540 | { |
| 541 | struct list_head list; |
| 542 | |
| 543 | INIT_LIST_HEAD(&list); |
| 544 | mutex_lock(&dpm_list_mtx); |
Romit Dasgupta | e528e87 | 2009-10-28 22:56:02 +0100 | [diff] [blame] | 545 | transition_started = false; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 546 | while (!list_empty(&dpm_list)) { |
| 547 | struct device *dev = to_device(dpm_list.prev); |
| 548 | |
| 549 | get_device(dev); |
| 550 | if (dev->power.status > DPM_ON) { |
| 551 | dev->power.status = DPM_ON; |
| 552 | mutex_unlock(&dpm_list_mtx); |
| 553 | |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 554 | device_complete(dev, state); |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 555 | pm_runtime_put_noidle(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 556 | |
| 557 | mutex_lock(&dpm_list_mtx); |
| 558 | } |
| 559 | if (!list_empty(&dev->power.entry)) |
| 560 | list_move(&dev->power.entry, &list); |
| 561 | put_device(dev); |
| 562 | } |
| 563 | list_splice(&list, &dpm_list); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 564 | mutex_unlock(&dpm_list_mtx); |
| 565 | } |
| 566 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 567 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 568 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
| 569 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 570 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 571 | * Execute "resume" callbacks for all devices and complete the PM transition of |
| 572 | * the system. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 573 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 574 | void dpm_resume_end(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 575 | { |
| 576 | might_sleep(); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 577 | dpm_resume(state); |
| 578 | dpm_complete(state); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 579 | } |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 580 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 581 | |
| 582 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 583 | /*------------------------- Suspend routines -------------------------*/ |
| 584 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 585 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 586 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
| 587 | * @sleep_state: PM message representing a sleep state. |
| 588 | * |
| 589 | * Return a PM message representing the resume event corresponding to given |
| 590 | * sleep state. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 591 | */ |
| 592 | static pm_message_t resume_event(pm_message_t sleep_state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 593 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 594 | switch (sleep_state.event) { |
| 595 | case PM_EVENT_SUSPEND: |
| 596 | return PMSG_RESUME; |
| 597 | case PM_EVENT_FREEZE: |
| 598 | case PM_EVENT_QUIESCE: |
| 599 | return PMSG_RECOVER; |
| 600 | case PM_EVENT_HIBERNATE: |
| 601 | return PMSG_RESTORE; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 602 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 603 | return PMSG_ON; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 604 | } |
| 605 | |
| 606 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 607 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
| 608 | * @dev: Device to handle. |
| 609 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 610 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 611 | * The driver of @dev will not receive interrupts while this function is being |
| 612 | * executed. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 613 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 614 | 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] | 615 | { |
| 616 | int error = 0; |
| 617 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 618 | if (!dev->bus) |
| 619 | return 0; |
| 620 | |
| 621 | if (dev->bus->pm) { |
| 622 | pm_dev_dbg(dev, state, "LATE "); |
| 623 | error = pm_noirq_op(dev, dev->bus->pm, state); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 624 | } |
| 625 | return error; |
| 626 | } |
| 627 | |
| 628 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 629 | * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices. |
| 630 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 631 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 632 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
| 633 | * handlers for all non-sysdev devices. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 634 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 635 | int dpm_suspend_noirq(pm_message_t state) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 636 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 637 | struct device *dev; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 638 | int error = 0; |
| 639 | |
Rafael J. Wysocki | 2ed8d2b | 2009-03-16 22:34:06 +0100 | [diff] [blame] | 640 | suspend_device_irqs(); |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 641 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 642 | list_for_each_entry_reverse(dev, &dpm_list, power.entry) { |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 643 | error = device_suspend_noirq(dev, state); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 644 | if (error) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 645 | pm_dev_err(dev, state, " late", error); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 646 | break; |
| 647 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 648 | dev->power.status = DPM_OFF_IRQ; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 649 | } |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 650 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 651 | if (error) |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 652 | dpm_resume_noirq(resume_event(state)); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 653 | return error; |
| 654 | } |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 655 | EXPORT_SYMBOL_GPL(dpm_suspend_noirq); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 656 | |
| 657 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 658 | * device_suspend - Execute "suspend" callbacks for given device. |
| 659 | * @dev: Device to handle. |
| 660 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 661 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 662 | static int device_suspend(struct device *dev, pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 663 | { |
| 664 | int error = 0; |
| 665 | |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 666 | down(&dev->sem); |
| 667 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 668 | if (dev->class) { |
| 669 | if (dev->class->pm) { |
| 670 | pm_dev_dbg(dev, state, "class "); |
| 671 | error = pm_op(dev, dev->class->pm, state); |
| 672 | } else if (dev->class->suspend) { |
| 673 | pm_dev_dbg(dev, state, "legacy class "); |
| 674 | error = dev->class->suspend(dev, state); |
| 675 | suspend_report_result(dev->class->suspend, error); |
| 676 | } |
| 677 | if (error) |
| 678 | goto End; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 679 | } |
| 680 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 681 | if (dev->type) { |
| 682 | if (dev->type->pm) { |
| 683 | pm_dev_dbg(dev, state, "type "); |
| 684 | error = pm_op(dev, dev->type->pm, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 685 | } |
| 686 | if (error) |
| 687 | goto End; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 688 | } |
| 689 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 690 | if (dev->bus) { |
| 691 | if (dev->bus->pm) { |
| 692 | pm_dev_dbg(dev, state, ""); |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 693 | error = pm_op(dev, dev->bus->pm, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 694 | } else if (dev->bus->suspend) { |
| 695 | pm_dev_dbg(dev, state, "legacy "); |
| 696 | error = dev->bus->suspend(dev, state); |
| 697 | suspend_report_result(dev->bus->suspend, error); |
| 698 | } |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 699 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 700 | End: |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 701 | up(&dev->sem); |
| 702 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 703 | return error; |
| 704 | } |
| 705 | |
| 706 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 707 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
| 708 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 709 | */ |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 710 | static int dpm_suspend(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 711 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 712 | struct list_head list; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 713 | int error = 0; |
| 714 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 715 | INIT_LIST_HEAD(&list); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 716 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 717 | while (!list_empty(&dpm_list)) { |
| 718 | struct device *dev = to_device(dpm_list.prev); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 719 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 720 | get_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 721 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 722 | |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 723 | error = device_suspend(dev, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 724 | |
Alan Stern | 1b3cbec | 2008-02-29 11:50:22 -0500 | [diff] [blame] | 725 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 726 | if (error) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 727 | pm_dev_err(dev, state, "", error); |
| 728 | put_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 729 | break; |
| 730 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 731 | dev->power.status = DPM_OFF; |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 732 | if (!list_empty(&dev->power.entry)) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 733 | list_move(&dev->power.entry, &list); |
| 734 | put_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 735 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 736 | list_splice(&list, dpm_list.prev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 737 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 738 | return error; |
| 739 | } |
| 740 | |
| 741 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 742 | * device_prepare - Prepare a device for system power transition. |
| 743 | * @dev: Device to handle. |
| 744 | * @state: PM transition of the system being carried out. |
| 745 | * |
| 746 | * Execute the ->prepare() callback(s) for given device. No new children of the |
| 747 | * device may be registered after this function has returned. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 748 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 749 | static int device_prepare(struct device *dev, pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 750 | { |
| 751 | int error = 0; |
| 752 | |
| 753 | down(&dev->sem); |
| 754 | |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 755 | if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 756 | pm_dev_dbg(dev, state, "preparing "); |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 757 | error = dev->bus->pm->prepare(dev); |
| 758 | suspend_report_result(dev->bus->pm->prepare, error); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 759 | if (error) |
| 760 | goto End; |
| 761 | } |
| 762 | |
| 763 | if (dev->type && dev->type->pm && dev->type->pm->prepare) { |
| 764 | pm_dev_dbg(dev, state, "preparing type "); |
| 765 | error = dev->type->pm->prepare(dev); |
| 766 | suspend_report_result(dev->type->pm->prepare, error); |
| 767 | if (error) |
| 768 | goto End; |
| 769 | } |
| 770 | |
| 771 | if (dev->class && dev->class->pm && dev->class->pm->prepare) { |
| 772 | pm_dev_dbg(dev, state, "preparing class "); |
| 773 | error = dev->class->pm->prepare(dev); |
| 774 | suspend_report_result(dev->class->pm->prepare, error); |
| 775 | } |
| 776 | End: |
| 777 | up(&dev->sem); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 778 | |
| 779 | return error; |
| 780 | } |
| 781 | |
| 782 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 783 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
| 784 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 785 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 786 | * Execute the ->prepare() callback(s) for all devices. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 787 | */ |
| 788 | static int dpm_prepare(pm_message_t state) |
| 789 | { |
| 790 | struct list_head list; |
| 791 | int error = 0; |
| 792 | |
| 793 | INIT_LIST_HEAD(&list); |
| 794 | mutex_lock(&dpm_list_mtx); |
| 795 | transition_started = true; |
| 796 | while (!list_empty(&dpm_list)) { |
| 797 | struct device *dev = to_device(dpm_list.next); |
| 798 | |
| 799 | get_device(dev); |
| 800 | dev->power.status = DPM_PREPARING; |
| 801 | mutex_unlock(&dpm_list_mtx); |
| 802 | |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 803 | pm_runtime_get_noresume(dev); |
| 804 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) { |
| 805 | /* Wake-up requested during system sleep transition. */ |
| 806 | pm_runtime_put_noidle(dev); |
| 807 | error = -EBUSY; |
| 808 | } else { |
| 809 | error = device_prepare(dev, state); |
| 810 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 811 | |
| 812 | mutex_lock(&dpm_list_mtx); |
| 813 | if (error) { |
| 814 | dev->power.status = DPM_ON; |
| 815 | if (error == -EAGAIN) { |
| 816 | put_device(dev); |
Sebastian Ott | 886a7a3 | 2009-07-08 13:26:05 +0200 | [diff] [blame] | 817 | error = 0; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 818 | continue; |
| 819 | } |
| 820 | printk(KERN_ERR "PM: Failed to prepare device %s " |
| 821 | "for power transition: error %d\n", |
| 822 | kobject_name(&dev->kobj), error); |
| 823 | put_device(dev); |
| 824 | break; |
| 825 | } |
| 826 | dev->power.status = DPM_SUSPENDING; |
| 827 | if (!list_empty(&dev->power.entry)) |
| 828 | list_move_tail(&dev->power.entry, &list); |
| 829 | put_device(dev); |
| 830 | } |
| 831 | list_splice(&list, &dpm_list); |
| 832 | mutex_unlock(&dpm_list_mtx); |
| 833 | return error; |
| 834 | } |
| 835 | |
| 836 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 837 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
| 838 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 839 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 840 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
| 841 | * callbacks for them. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 842 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 843 | int dpm_suspend_start(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 844 | { |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 845 | int error; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 846 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 847 | might_sleep(); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 848 | error = dpm_prepare(state); |
| 849 | if (!error) |
| 850 | error = dpm_suspend(state); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 851 | return error; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 852 | } |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 853 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 854 | |
| 855 | void __suspend_report_result(const char *function, void *fn, int ret) |
| 856 | { |
Bjorn Helgaas | c80cfb0 | 2008-10-15 22:01:35 -0700 | [diff] [blame] | 857 | if (ret) |
| 858 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 859 | } |
| 860 | EXPORT_SYMBOL_GPL(__suspend_report_result); |