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. |
Uwe Kleine-König | b595076 | 2010-11-01 15:38:34 -0400 | [diff] [blame] | 11 | * This will initialize the embedded device_pm_info object in the device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Paul Gortmaker | 1b6bc32 | 2011-05-27 07:12:15 -0400 | [diff] [blame^] | 22 | #include <linux/export.h> |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 23 | #include <linux/mutex.h> |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 24 | #include <linux/pm.h> |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 25 | #include <linux/pm_runtime.h> |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 26 | #include <linux/resume-trace.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> |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 29 | #include <linux/async.h> |
Rafael J. Wysocki | 1e75227 | 2010-12-03 22:58:05 +0100 | [diff] [blame] | 30 | #include <linux/suspend.h> |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 31 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 32 | #include "../base.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include "power.h" |
| 34 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 35 | /* |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 36 | * 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] | 37 | * because children are guaranteed to be discovered after parents, and |
| 38 | * are inserted at the back of the list on discovery. |
| 39 | * |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 40 | * Since device_pm_add() may be called with a device lock held, |
| 41 | * we must never try to acquire a device lock while holding |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 42 | * dpm_list_mutex. |
| 43 | */ |
| 44 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 45 | LIST_HEAD(dpm_list); |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 46 | LIST_HEAD(dpm_prepared_list); |
| 47 | LIST_HEAD(dpm_suspended_list); |
| 48 | LIST_HEAD(dpm_noirq_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 50 | struct suspend_stats suspend_stats; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 51 | static DEFINE_MUTEX(dpm_list_mtx); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 52 | static pm_message_t pm_transition; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
Rafael J. Wysocki | 098dff7 | 2010-09-22 22:10:57 +0200 | [diff] [blame] | 54 | static int async_error; |
| 55 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 56 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 57 | * 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] | 58 | * @dev: Device object being initialized. |
| 59 | */ |
| 60 | void device_pm_init(struct device *dev) |
| 61 | { |
Alan Stern | f76b168b | 2011-06-18 20:22:23 +0200 | [diff] [blame] | 62 | dev->power.is_prepared = false; |
Alan Stern | 6d0e0e8 | 2011-06-18 22:42:09 +0200 | [diff] [blame] | 63 | dev->power.is_suspended = false; |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 64 | init_completion(&dev->power.completion); |
Colin Cross | 152e1d5 | 2010-09-03 01:24:07 +0200 | [diff] [blame] | 65 | complete_all(&dev->power.completion); |
Rafael J. Wysocki | 074037e | 2010-09-22 22:09:10 +0200 | [diff] [blame] | 66 | dev->power.wakeup = NULL; |
| 67 | spin_lock_init(&dev->power.lock); |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 68 | pm_runtime_init(dev); |
Rafael J. Wysocki | 22110fa | 2011-04-26 11:33:09 +0200 | [diff] [blame] | 69 | INIT_LIST_HEAD(&dev->power.entry); |
Rafael J. Wysocki | 1a9a915 | 2011-09-29 22:29:44 +0200 | [diff] [blame] | 70 | dev->power.power_state = PMSG_INVALID; |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 71 | } |
| 72 | |
| 73 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 74 | * 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] | 75 | */ |
| 76 | void device_pm_lock(void) |
| 77 | { |
| 78 | mutex_lock(&dpm_list_mtx); |
| 79 | } |
| 80 | |
| 81 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 82 | * 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] | 83 | */ |
| 84 | void device_pm_unlock(void) |
| 85 | { |
| 86 | mutex_unlock(&dpm_list_mtx); |
| 87 | } |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 88 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 89 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 90 | * device_pm_add - Add a device to the PM core's list of active devices. |
| 91 | * @dev: Device to add to the list. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 92 | */ |
Alan Stern | 3b98aea | 2008-08-07 13:06:12 -0400 | [diff] [blame] | 93 | void device_pm_add(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | pr_debug("PM: Adding info for %s:%s\n", |
Rafael J. Wysocki | 5c1a07a | 2010-12-24 15:03:34 +0100 | [diff] [blame] | 96 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 97 | mutex_lock(&dpm_list_mtx); |
Alan Stern | f76b168b | 2011-06-18 20:22:23 +0200 | [diff] [blame] | 98 | if (dev->parent && dev->parent->power.is_prepared) |
Rafael J. Wysocki | b64959e | 2010-12-16 17:11:45 +0100 | [diff] [blame] | 99 | dev_warn(dev, "parent %s should not be sleeping\n", |
| 100 | dev_name(dev->parent)); |
Alan Stern | 3b98aea | 2008-08-07 13:06:12 -0400 | [diff] [blame] | 101 | list_add_tail(&dev->power.entry, &dpm_list); |
Jean Pihet | 91ff4cb | 2011-08-25 15:35:41 +0200 | [diff] [blame] | 102 | dev_pm_qos_constraints_init(dev); |
Rafael J. Wysocki | 1a9a915 | 2011-09-29 22:29:44 +0200 | [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", |
Rafael J. Wysocki | 5c1a07a | 2010-12-24 15:03:34 +0100 | [diff] [blame] | 113 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 114 | complete_all(&dev->power.completion); |
Matthias Kaehlcke | 11048dc | 2007-05-23 14:19:41 -0700 | [diff] [blame] | 115 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1a9a915 | 2011-09-29 22:29:44 +0200 | [diff] [blame] | 116 | dev_pm_qos_constraints_destroy(dev); |
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 | 074037e | 2010-09-22 22:09:10 +0200 | [diff] [blame] | 119 | device_wakeup_disable(dev); |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 120 | pm_runtime_remove(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 121 | } |
| 122 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 123 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 124 | * device_pm_move_before - Move device in the PM core's list of active devices. |
| 125 | * @deva: Device to move in dpm_list. |
| 126 | * @devb: Device @deva should come before. |
Cornelia Huck | ffa6a70 | 2009-03-04 12:44:00 +0100 | [diff] [blame] | 127 | */ |
| 128 | void device_pm_move_before(struct device *deva, struct device *devb) |
| 129 | { |
| 130 | pr_debug("PM: Moving %s:%s before %s:%s\n", |
Rafael J. Wysocki | 5c1a07a | 2010-12-24 15:03:34 +0100 | [diff] [blame] | 131 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
| 132 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); |
Cornelia Huck | ffa6a70 | 2009-03-04 12:44:00 +0100 | [diff] [blame] | 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", |
Rafael J. Wysocki | 5c1a07a | 2010-12-24 15:03:34 +0100 | [diff] [blame] | 145 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
| 146 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); |
Cornelia Huck | ffa6a70 | 2009-03-04 12:44:00 +0100 | [diff] [blame] | 147 | /* Delete deva from dpm_list and reinsert after devb. */ |
| 148 | list_move(&deva->power.entry, &devb->power.entry); |
| 149 | } |
| 150 | |
| 151 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 152 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
| 153 | * @dev: Device to move in dpm_list. |
Cornelia Huck | ffa6a70 | 2009-03-04 12:44:00 +0100 | [diff] [blame] | 154 | */ |
| 155 | void device_pm_move_last(struct device *dev) |
| 156 | { |
| 157 | pr_debug("PM: Moving %s:%s to end of list\n", |
Rafael J. Wysocki | 5c1a07a | 2010-12-24 15:03:34 +0100 | [diff] [blame] | 158 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
Cornelia Huck | ffa6a70 | 2009-03-04 12:44:00 +0100 | [diff] [blame] | 159 | list_move_tail(&dev->power.entry, &dpm_list); |
| 160 | } |
| 161 | |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 162 | static ktime_t initcall_debug_start(struct device *dev) |
| 163 | { |
| 164 | ktime_t calltime = ktime_set(0, 0); |
| 165 | |
| 166 | if (initcall_debug) { |
| 167 | pr_info("calling %s+ @ %i\n", |
| 168 | dev_name(dev), task_pid_nr(current)); |
| 169 | calltime = ktime_get(); |
| 170 | } |
| 171 | |
| 172 | return calltime; |
| 173 | } |
| 174 | |
| 175 | static void initcall_debug_report(struct device *dev, ktime_t calltime, |
| 176 | int error) |
| 177 | { |
| 178 | ktime_t delta, rettime; |
| 179 | |
| 180 | if (initcall_debug) { |
| 181 | rettime = ktime_get(); |
| 182 | delta = ktime_sub(rettime, calltime); |
| 183 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), |
| 184 | error, (unsigned long long)ktime_to_ns(delta) >> 10); |
| 185 | } |
| 186 | } |
| 187 | |
Cornelia Huck | ffa6a70 | 2009-03-04 12:44:00 +0100 | [diff] [blame] | 188 | /** |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 189 | * dpm_wait - Wait for a PM operation to complete. |
| 190 | * @dev: Device to wait for. |
| 191 | * @async: If unset, wait only if the device's power.async_suspend flag is set. |
| 192 | */ |
| 193 | static void dpm_wait(struct device *dev, bool async) |
| 194 | { |
| 195 | if (!dev) |
| 196 | return; |
| 197 | |
Rafael J. Wysocki | 0e06b4a | 2010-01-23 22:25:15 +0100 | [diff] [blame] | 198 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 199 | wait_for_completion(&dev->power.completion); |
| 200 | } |
| 201 | |
| 202 | static int dpm_wait_fn(struct device *dev, void *async_ptr) |
| 203 | { |
| 204 | dpm_wait(dev, *((bool *)async_ptr)); |
| 205 | return 0; |
| 206 | } |
| 207 | |
| 208 | static void dpm_wait_for_children(struct device *dev, bool async) |
| 209 | { |
| 210 | device_for_each_child(dev, &async, dpm_wait_fn); |
| 211 | } |
| 212 | |
| 213 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 214 | * pm_op - Execute the PM operation appropriate for given PM event. |
| 215 | * @dev: Device to handle. |
| 216 | * @ops: PM operations to choose from. |
| 217 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 218 | */ |
Dmitry Torokhov | d9ab771 | 2009-07-22 00:37:25 +0200 | [diff] [blame] | 219 | static int pm_op(struct device *dev, |
| 220 | const struct dev_pm_ops *ops, |
| 221 | pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 222 | { |
| 223 | int error = 0; |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 224 | ktime_t calltime; |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame] | 225 | |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 226 | calltime = initcall_debug_start(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 227 | |
| 228 | switch (state.event) { |
| 229 | #ifdef CONFIG_SUSPEND |
| 230 | case PM_EVENT_SUSPEND: |
| 231 | if (ops->suspend) { |
| 232 | error = ops->suspend(dev); |
| 233 | suspend_report_result(ops->suspend, error); |
| 234 | } |
| 235 | break; |
| 236 | case PM_EVENT_RESUME: |
| 237 | if (ops->resume) { |
| 238 | error = ops->resume(dev); |
| 239 | suspend_report_result(ops->resume, error); |
| 240 | } |
| 241 | break; |
| 242 | #endif /* CONFIG_SUSPEND */ |
Rafael J. Wysocki | 1f112ce | 2011-04-11 22:54:42 +0200 | [diff] [blame] | 243 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 244 | case PM_EVENT_FREEZE: |
| 245 | case PM_EVENT_QUIESCE: |
| 246 | if (ops->freeze) { |
| 247 | error = ops->freeze(dev); |
| 248 | suspend_report_result(ops->freeze, error); |
| 249 | } |
| 250 | break; |
| 251 | case PM_EVENT_HIBERNATE: |
| 252 | if (ops->poweroff) { |
| 253 | error = ops->poweroff(dev); |
| 254 | suspend_report_result(ops->poweroff, error); |
| 255 | } |
| 256 | break; |
| 257 | case PM_EVENT_THAW: |
| 258 | case PM_EVENT_RECOVER: |
| 259 | if (ops->thaw) { |
| 260 | error = ops->thaw(dev); |
| 261 | suspend_report_result(ops->thaw, error); |
| 262 | } |
| 263 | break; |
| 264 | case PM_EVENT_RESTORE: |
| 265 | if (ops->restore) { |
| 266 | error = ops->restore(dev); |
| 267 | suspend_report_result(ops->restore, error); |
| 268 | } |
| 269 | break; |
Rafael J. Wysocki | 1f112ce | 2011-04-11 22:54:42 +0200 | [diff] [blame] | 270 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 271 | default: |
| 272 | error = -EINVAL; |
| 273 | } |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame] | 274 | |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 275 | initcall_debug_report(dev, calltime, error); |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame] | 276 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 277 | return error; |
| 278 | } |
| 279 | |
| 280 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 281 | * pm_noirq_op - Execute the PM operation appropriate for given PM event. |
| 282 | * @dev: Device to handle. |
| 283 | * @ops: PM operations to choose from. |
| 284 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 285 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 286 | * The driver of @dev will not receive interrupts while this function is being |
| 287 | * executed. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 288 | */ |
Dmitry Torokhov | d9ab771 | 2009-07-22 00:37:25 +0200 | [diff] [blame] | 289 | static int pm_noirq_op(struct device *dev, |
| 290 | const struct dev_pm_ops *ops, |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 291 | pm_message_t state) |
| 292 | { |
| 293 | int error = 0; |
Rafael J. Wysocki | 2cbb3ce | 2010-12-15 00:17:29 +0100 | [diff] [blame] | 294 | ktime_t calltime = ktime_set(0, 0), delta, rettime; |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame] | 295 | |
| 296 | if (initcall_debug) { |
Rafael J. Wysocki | 8cc6b39 | 2010-01-23 22:03:29 +0100 | [diff] [blame] | 297 | pr_info("calling %s+ @ %i, parent: %s\n", |
| 298 | dev_name(dev), task_pid_nr(current), |
| 299 | dev->parent ? dev_name(dev->parent) : "none"); |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame] | 300 | calltime = ktime_get(); |
| 301 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 302 | |
| 303 | switch (state.event) { |
| 304 | #ifdef CONFIG_SUSPEND |
| 305 | case PM_EVENT_SUSPEND: |
| 306 | if (ops->suspend_noirq) { |
| 307 | error = ops->suspend_noirq(dev); |
| 308 | suspend_report_result(ops->suspend_noirq, error); |
| 309 | } |
| 310 | break; |
| 311 | case PM_EVENT_RESUME: |
| 312 | if (ops->resume_noirq) { |
| 313 | error = ops->resume_noirq(dev); |
| 314 | suspend_report_result(ops->resume_noirq, error); |
| 315 | } |
| 316 | break; |
| 317 | #endif /* CONFIG_SUSPEND */ |
Rafael J. Wysocki | 1f112ce | 2011-04-11 22:54:42 +0200 | [diff] [blame] | 318 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 319 | case PM_EVENT_FREEZE: |
| 320 | case PM_EVENT_QUIESCE: |
| 321 | if (ops->freeze_noirq) { |
| 322 | error = ops->freeze_noirq(dev); |
| 323 | suspend_report_result(ops->freeze_noirq, error); |
| 324 | } |
| 325 | break; |
| 326 | case PM_EVENT_HIBERNATE: |
| 327 | if (ops->poweroff_noirq) { |
| 328 | error = ops->poweroff_noirq(dev); |
| 329 | suspend_report_result(ops->poweroff_noirq, error); |
| 330 | } |
| 331 | break; |
| 332 | case PM_EVENT_THAW: |
| 333 | case PM_EVENT_RECOVER: |
| 334 | if (ops->thaw_noirq) { |
| 335 | error = ops->thaw_noirq(dev); |
| 336 | suspend_report_result(ops->thaw_noirq, error); |
| 337 | } |
| 338 | break; |
| 339 | case PM_EVENT_RESTORE: |
| 340 | if (ops->restore_noirq) { |
| 341 | error = ops->restore_noirq(dev); |
| 342 | suspend_report_result(ops->restore_noirq, error); |
| 343 | } |
| 344 | break; |
Rafael J. Wysocki | 1f112ce | 2011-04-11 22:54:42 +0200 | [diff] [blame] | 345 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 346 | default: |
| 347 | error = -EINVAL; |
| 348 | } |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame] | 349 | |
| 350 | if (initcall_debug) { |
| 351 | rettime = ktime_get(); |
| 352 | delta = ktime_sub(rettime, calltime); |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 353 | printk("initcall %s_i+ returned %d after %Ld usecs\n", |
| 354 | dev_name(dev), error, |
| 355 | (unsigned long long)ktime_to_ns(delta) >> 10); |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame] | 356 | } |
| 357 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 358 | return error; |
| 359 | } |
| 360 | |
| 361 | static char *pm_verb(int event) |
| 362 | { |
| 363 | switch (event) { |
| 364 | case PM_EVENT_SUSPEND: |
| 365 | return "suspend"; |
| 366 | case PM_EVENT_RESUME: |
| 367 | return "resume"; |
| 368 | case PM_EVENT_FREEZE: |
| 369 | return "freeze"; |
| 370 | case PM_EVENT_QUIESCE: |
| 371 | return "quiesce"; |
| 372 | case PM_EVENT_HIBERNATE: |
| 373 | return "hibernate"; |
| 374 | case PM_EVENT_THAW: |
| 375 | return "thaw"; |
| 376 | case PM_EVENT_RESTORE: |
| 377 | return "restore"; |
| 378 | case PM_EVENT_RECOVER: |
| 379 | return "recover"; |
| 380 | default: |
| 381 | return "(unknown PM event)"; |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) |
| 386 | { |
| 387 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), |
| 388 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? |
| 389 | ", may wakeup" : ""); |
| 390 | } |
| 391 | |
| 392 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, |
| 393 | int error) |
| 394 | { |
| 395 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", |
Rafael J. Wysocki | 5c1a07a | 2010-12-24 15:03:34 +0100 | [diff] [blame] | 396 | dev_name(dev), pm_verb(state.event), info, error); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 397 | } |
| 398 | |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 399 | static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) |
| 400 | { |
| 401 | ktime_t calltime; |
Kevin Cernekee | 0702d9e | 2010-09-20 22:32:10 +0200 | [diff] [blame] | 402 | u64 usecs64; |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 403 | int usecs; |
| 404 | |
| 405 | calltime = ktime_get(); |
| 406 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); |
| 407 | do_div(usecs64, NSEC_PER_USEC); |
| 408 | usecs = usecs64; |
| 409 | if (usecs == 0) |
| 410 | usecs = 1; |
| 411 | pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n", |
| 412 | info ?: "", info ? " " : "", pm_verb(state.event), |
| 413 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); |
| 414 | } |
| 415 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 416 | /*------------------------- Resume routines -------------------------*/ |
| 417 | |
| 418 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 419 | * device_resume_noirq - Execute an "early resume" callback for given device. |
| 420 | * @dev: Device to handle. |
| 421 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 422 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 423 | * The driver of @dev will not receive interrupts while this function is being |
| 424 | * executed. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 425 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 426 | static int device_resume_noirq(struct device *dev, pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 427 | { |
| 428 | int error = 0; |
| 429 | |
| 430 | TRACE_DEVICE(dev); |
| 431 | TRACE_RESUME(0); |
| 432 | |
Rafael J. Wysocki | 564b905 | 2011-06-23 01:52:55 +0200 | [diff] [blame] | 433 | if (dev->pm_domain) { |
Rafael J. Wysocki | 7538e3d | 2011-02-16 21:53:17 +0100 | [diff] [blame] | 434 | pm_dev_dbg(dev, state, "EARLY power domain "); |
Rafael J. Wysocki | 564b905 | 2011-06-23 01:52:55 +0200 | [diff] [blame] | 435 | error = pm_noirq_op(dev, &dev->pm_domain->ops, state); |
Rafael J. Wysocki | 4d27e9d | 2011-04-29 00:35:50 +0200 | [diff] [blame] | 436 | } else if (dev->type && dev->type->pm) { |
Dominik Brodowski | e7176a3 | 2010-03-15 21:43:11 +0100 | [diff] [blame] | 437 | pm_dev_dbg(dev, state, "EARLY type "); |
| 438 | error = pm_noirq_op(dev, dev->type->pm, state); |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 439 | } else if (dev->class && dev->class->pm) { |
Dominik Brodowski | e7176a3 | 2010-03-15 21:43:11 +0100 | [diff] [blame] | 440 | pm_dev_dbg(dev, state, "EARLY class "); |
| 441 | error = pm_noirq_op(dev, dev->class->pm, state); |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 442 | } else if (dev->bus && dev->bus->pm) { |
| 443 | pm_dev_dbg(dev, state, "EARLY "); |
| 444 | error = pm_noirq_op(dev, dev->bus->pm, state); |
Dominik Brodowski | e7176a3 | 2010-03-15 21:43:11 +0100 | [diff] [blame] | 445 | } |
| 446 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 447 | TRACE_RESUME(error); |
| 448 | return error; |
| 449 | } |
| 450 | |
| 451 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 452 | * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices. |
| 453 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 454 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 455 | * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and |
| 456 | * enable device drivers to receive interrupts. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 457 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 458 | void dpm_resume_noirq(pm_message_t state) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 459 | { |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 460 | ktime_t starttime = ktime_get(); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 461 | |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 462 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 463 | while (!list_empty(&dpm_noirq_list)) { |
| 464 | struct device *dev = to_device(dpm_noirq_list.next); |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 465 | int error; |
Rafael J. Wysocki | d08a5ac | 2010-11-11 01:50:53 +0100 | [diff] [blame] | 466 | |
| 467 | get_device(dev); |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 468 | list_move_tail(&dev->power.entry, &dpm_suspended_list); |
| 469 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 470 | |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 471 | error = device_resume_noirq(dev, state); |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 472 | if (error) { |
| 473 | suspend_stats.failed_resume_noirq++; |
| 474 | dpm_save_failed_step(SUSPEND_RESUME_NOIRQ); |
| 475 | dpm_save_failed_dev(dev_name(dev)); |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 476 | pm_dev_err(dev, state, " early", error); |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 477 | } |
Rafael J. Wysocki | d08a5ac | 2010-11-11 01:50:53 +0100 | [diff] [blame] | 478 | |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 479 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | d08a5ac | 2010-11-11 01:50:53 +0100 | [diff] [blame] | 480 | put_device(dev); |
| 481 | } |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 482 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 483 | dpm_show_time(starttime, state, "early"); |
Rafael J. Wysocki | 2ed8d2b | 2009-03-16 22:34:06 +0100 | [diff] [blame] | 484 | resume_device_irqs(); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 485 | } |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 486 | EXPORT_SYMBOL_GPL(dpm_resume_noirq); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 487 | |
| 488 | /** |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 489 | * legacy_resume - Execute a legacy (bus or class) resume callback for device. |
Randy Dunlap | 0a88422 | 2010-01-08 14:42:57 -0800 | [diff] [blame] | 490 | * @dev: Device to resume. |
| 491 | * @cb: Resume callback to execute. |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 492 | */ |
| 493 | static int legacy_resume(struct device *dev, int (*cb)(struct device *dev)) |
| 494 | { |
| 495 | int error; |
| 496 | ktime_t calltime; |
| 497 | |
| 498 | calltime = initcall_debug_start(dev); |
| 499 | |
| 500 | error = cb(dev); |
| 501 | suspend_report_result(cb, error); |
| 502 | |
| 503 | initcall_debug_report(dev, calltime, error); |
| 504 | |
| 505 | return error; |
| 506 | } |
| 507 | |
| 508 | /** |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 509 | * device_resume - Execute "resume" callbacks for given device. |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 510 | * @dev: Device to handle. |
| 511 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 512 | * @async: If true, the device is being resumed asynchronously. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 513 | */ |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 514 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 515 | { |
| 516 | int error = 0; |
Rafael J. Wysocki | 1e2ef05 | 2011-07-06 10:51:58 +0200 | [diff] [blame] | 517 | bool put = false; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 518 | |
| 519 | TRACE_DEVICE(dev); |
| 520 | TRACE_RESUME(0); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 521 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 522 | dpm_wait(dev->parent, async); |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 523 | device_lock(dev); |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 524 | |
Alan Stern | f76b168b | 2011-06-18 20:22:23 +0200 | [diff] [blame] | 525 | /* |
| 526 | * This is a fib. But we'll allow new children to be added below |
| 527 | * a resumed device, even if the device hasn't been completed yet. |
| 528 | */ |
| 529 | dev->power.is_prepared = false; |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 530 | |
Alan Stern | 6d0e0e8 | 2011-06-18 22:42:09 +0200 | [diff] [blame] | 531 | if (!dev->power.is_suspended) |
| 532 | goto Unlock; |
| 533 | |
Rafael J. Wysocki | 1e2ef05 | 2011-07-06 10:51:58 +0200 | [diff] [blame] | 534 | pm_runtime_enable(dev); |
| 535 | put = true; |
| 536 | |
Rafael J. Wysocki | 564b905 | 2011-06-23 01:52:55 +0200 | [diff] [blame] | 537 | if (dev->pm_domain) { |
Rafael J. Wysocki | 7538e3d | 2011-02-16 21:53:17 +0100 | [diff] [blame] | 538 | pm_dev_dbg(dev, state, "power domain "); |
Rafael J. Wysocki | 564b905 | 2011-06-23 01:52:55 +0200 | [diff] [blame] | 539 | error = pm_op(dev, &dev->pm_domain->ops, state); |
Rafael J. Wysocki | 4d27e9d | 2011-04-29 00:35:50 +0200 | [diff] [blame] | 540 | goto End; |
Rafael J. Wysocki | 7538e3d | 2011-02-16 21:53:17 +0100 | [diff] [blame] | 541 | } |
| 542 | |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 543 | if (dev->type && dev->type->pm) { |
| 544 | pm_dev_dbg(dev, state, "type "); |
| 545 | error = pm_op(dev, dev->type->pm, state); |
| 546 | goto End; |
| 547 | } |
| 548 | |
| 549 | if (dev->class) { |
| 550 | if (dev->class->pm) { |
| 551 | pm_dev_dbg(dev, state, "class "); |
| 552 | error = pm_op(dev, dev->class->pm, state); |
| 553 | goto End; |
| 554 | } else if (dev->class->resume) { |
| 555 | pm_dev_dbg(dev, state, "legacy class "); |
| 556 | error = legacy_resume(dev, dev->class->resume); |
| 557 | goto End; |
| 558 | } |
| 559 | } |
| 560 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 561 | if (dev->bus) { |
| 562 | if (dev->bus->pm) { |
| 563 | pm_dev_dbg(dev, state, ""); |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 564 | error = pm_op(dev, dev->bus->pm, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 565 | } else if (dev->bus->resume) { |
| 566 | pm_dev_dbg(dev, state, "legacy "); |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 567 | error = legacy_resume(dev, dev->bus->resume); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 568 | } |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 569 | } |
| 570 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 571 | End: |
Alan Stern | 6d0e0e8 | 2011-06-18 22:42:09 +0200 | [diff] [blame] | 572 | dev->power.is_suspended = false; |
| 573 | |
| 574 | Unlock: |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 575 | device_unlock(dev); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 576 | complete_all(&dev->power.completion); |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 577 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 578 | TRACE_RESUME(error); |
Rafael J. Wysocki | 1e2ef05 | 2011-07-06 10:51:58 +0200 | [diff] [blame] | 579 | |
| 580 | if (put) |
| 581 | pm_runtime_put_sync(dev); |
| 582 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 583 | return error; |
| 584 | } |
| 585 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 586 | static void async_resume(void *data, async_cookie_t cookie) |
| 587 | { |
| 588 | struct device *dev = (struct device *)data; |
| 589 | int error; |
| 590 | |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 591 | error = device_resume(dev, pm_transition, true); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 592 | if (error) |
| 593 | pm_dev_err(dev, pm_transition, " async", error); |
| 594 | put_device(dev); |
| 595 | } |
| 596 | |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 597 | static bool is_async(struct device *dev) |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 598 | { |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 599 | return dev->power.async_suspend && pm_async_enabled |
| 600 | && !pm_trace_is_enabled(); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 601 | } |
| 602 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 603 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 604 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
| 605 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 606 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 607 | * Execute the appropriate "resume" callback for all devices whose status |
| 608 | * indicates that they are suspended. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 609 | */ |
Rafael J. Wysocki | 91e7c75 | 2011-05-17 23:26:00 +0200 | [diff] [blame] | 610 | void dpm_resume(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 611 | { |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 612 | struct device *dev; |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 613 | ktime_t starttime = ktime_get(); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 614 | |
Rafael J. Wysocki | 91e7c75 | 2011-05-17 23:26:00 +0200 | [diff] [blame] | 615 | might_sleep(); |
| 616 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 617 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 618 | pm_transition = state; |
Rafael J. Wysocki | 098dff7 | 2010-09-22 22:10:57 +0200 | [diff] [blame] | 619 | async_error = 0; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 620 | |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 621 | list_for_each_entry(dev, &dpm_suspended_list, power.entry) { |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 622 | INIT_COMPLETION(dev->power.completion); |
| 623 | if (is_async(dev)) { |
| 624 | get_device(dev); |
| 625 | async_schedule(async_resume, dev); |
| 626 | } |
| 627 | } |
| 628 | |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 629 | while (!list_empty(&dpm_suspended_list)) { |
| 630 | dev = to_device(dpm_suspended_list.next); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 631 | get_device(dev); |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 632 | if (!is_async(dev)) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 633 | int error; |
| 634 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 635 | mutex_unlock(&dpm_list_mtx); |
| 636 | |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 637 | error = device_resume(dev, state, false); |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 638 | if (error) { |
| 639 | suspend_stats.failed_resume++; |
| 640 | dpm_save_failed_step(SUSPEND_RESUME); |
| 641 | dpm_save_failed_dev(dev_name(dev)); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 642 | pm_dev_err(dev, state, "", error); |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 643 | } |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 644 | |
| 645 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 646 | } |
| 647 | if (!list_empty(&dev->power.entry)) |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 648 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 649 | put_device(dev); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 650 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 651 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 652 | async_synchronize_full(); |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 653 | dpm_show_time(starttime, state, NULL); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 654 | } |
| 655 | |
| 656 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 657 | * device_complete - Complete a PM transition for given device. |
| 658 | * @dev: Device to handle. |
| 659 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 660 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 661 | static void device_complete(struct device *dev, pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 662 | { |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 663 | device_lock(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 664 | |
Rafael J. Wysocki | 564b905 | 2011-06-23 01:52:55 +0200 | [diff] [blame] | 665 | if (dev->pm_domain) { |
Rafael J. Wysocki | 7538e3d | 2011-02-16 21:53:17 +0100 | [diff] [blame] | 666 | pm_dev_dbg(dev, state, "completing power domain "); |
Rafael J. Wysocki | 564b905 | 2011-06-23 01:52:55 +0200 | [diff] [blame] | 667 | if (dev->pm_domain->ops.complete) |
| 668 | dev->pm_domain->ops.complete(dev); |
Rafael J. Wysocki | 4d27e9d | 2011-04-29 00:35:50 +0200 | [diff] [blame] | 669 | } else if (dev->type && dev->type->pm) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 670 | pm_dev_dbg(dev, state, "completing type "); |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 671 | if (dev->type->pm->complete) |
| 672 | dev->type->pm->complete(dev); |
| 673 | } else if (dev->class && dev->class->pm) { |
| 674 | pm_dev_dbg(dev, state, "completing class "); |
| 675 | if (dev->class->pm->complete) |
| 676 | dev->class->pm->complete(dev); |
| 677 | } else if (dev->bus && dev->bus->pm) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 678 | pm_dev_dbg(dev, state, "completing "); |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 679 | if (dev->bus->pm->complete) |
| 680 | dev->bus->pm->complete(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 681 | } |
| 682 | |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 683 | device_unlock(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 684 | } |
| 685 | |
| 686 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 687 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
| 688 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 689 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 690 | * Execute the ->complete() callbacks for all devices whose PM status is not |
| 691 | * DPM_ON (this allows new devices to be registered). |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 692 | */ |
Rafael J. Wysocki | 91e7c75 | 2011-05-17 23:26:00 +0200 | [diff] [blame] | 693 | void dpm_complete(pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 694 | { |
| 695 | struct list_head list; |
| 696 | |
Rafael J. Wysocki | 91e7c75 | 2011-05-17 23:26:00 +0200 | [diff] [blame] | 697 | might_sleep(); |
| 698 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 699 | INIT_LIST_HEAD(&list); |
| 700 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 701 | while (!list_empty(&dpm_prepared_list)) { |
| 702 | struct device *dev = to_device(dpm_prepared_list.prev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 703 | |
| 704 | get_device(dev); |
Alan Stern | f76b168b | 2011-06-18 20:22:23 +0200 | [diff] [blame] | 705 | dev->power.is_prepared = false; |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 706 | list_move(&dev->power.entry, &list); |
| 707 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 708 | |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 709 | device_complete(dev, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 710 | |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 711 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 712 | put_device(dev); |
| 713 | } |
| 714 | list_splice(&list, &dpm_list); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 715 | mutex_unlock(&dpm_list_mtx); |
| 716 | } |
| 717 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 718 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 719 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
| 720 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 721 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 722 | * Execute "resume" callbacks for all devices and complete the PM transition of |
| 723 | * the system. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 724 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 725 | void dpm_resume_end(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 726 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 727 | dpm_resume(state); |
| 728 | dpm_complete(state); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 729 | } |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 730 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 731 | |
| 732 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 733 | /*------------------------- Suspend routines -------------------------*/ |
| 734 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 735 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 736 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
| 737 | * @sleep_state: PM message representing a sleep state. |
| 738 | * |
| 739 | * Return a PM message representing the resume event corresponding to given |
| 740 | * sleep state. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 741 | */ |
| 742 | static pm_message_t resume_event(pm_message_t sleep_state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 743 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 744 | switch (sleep_state.event) { |
| 745 | case PM_EVENT_SUSPEND: |
| 746 | return PMSG_RESUME; |
| 747 | case PM_EVENT_FREEZE: |
| 748 | case PM_EVENT_QUIESCE: |
| 749 | return PMSG_RECOVER; |
| 750 | case PM_EVENT_HIBERNATE: |
| 751 | return PMSG_RESTORE; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 752 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 753 | return PMSG_ON; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 754 | } |
| 755 | |
| 756 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 757 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
| 758 | * @dev: Device to handle. |
| 759 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 760 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 761 | * The driver of @dev will not receive interrupts while this function is being |
| 762 | * executed. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 763 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 764 | 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] | 765 | { |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 766 | int error; |
Dominik Brodowski | e7176a3 | 2010-03-15 21:43:11 +0100 | [diff] [blame] | 767 | |
Rafael J. Wysocki | 564b905 | 2011-06-23 01:52:55 +0200 | [diff] [blame] | 768 | if (dev->pm_domain) { |
Rafael J. Wysocki | 4d27e9d | 2011-04-29 00:35:50 +0200 | [diff] [blame] | 769 | pm_dev_dbg(dev, state, "LATE power domain "); |
Rafael J. Wysocki | 564b905 | 2011-06-23 01:52:55 +0200 | [diff] [blame] | 770 | error = pm_noirq_op(dev, &dev->pm_domain->ops, state); |
Rafael J. Wysocki | 4d27e9d | 2011-04-29 00:35:50 +0200 | [diff] [blame] | 771 | if (error) |
| 772 | return error; |
| 773 | } else if (dev->type && dev->type->pm) { |
Dominik Brodowski | e7176a3 | 2010-03-15 21:43:11 +0100 | [diff] [blame] | 774 | pm_dev_dbg(dev, state, "LATE type "); |
| 775 | error = pm_noirq_op(dev, dev->type->pm, state); |
| 776 | if (error) |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 777 | return error; |
| 778 | } else if (dev->class && dev->class->pm) { |
| 779 | pm_dev_dbg(dev, state, "LATE class "); |
| 780 | error = pm_noirq_op(dev, dev->class->pm, state); |
| 781 | if (error) |
| 782 | return error; |
| 783 | } else if (dev->bus && dev->bus->pm) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 784 | pm_dev_dbg(dev, state, "LATE "); |
| 785 | error = pm_noirq_op(dev, dev->bus->pm, state); |
Rafael J. Wysocki | 7538e3d | 2011-02-16 21:53:17 +0100 | [diff] [blame] | 786 | if (error) |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 787 | return error; |
Rafael J. Wysocki | 7538e3d | 2011-02-16 21:53:17 +0100 | [diff] [blame] | 788 | } |
| 789 | |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 790 | return 0; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 791 | } |
| 792 | |
| 793 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 794 | * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices. |
| 795 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 796 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 797 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
| 798 | * handlers for all non-sysdev devices. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 799 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 800 | int dpm_suspend_noirq(pm_message_t state) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 801 | { |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 802 | ktime_t starttime = ktime_get(); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 803 | int error = 0; |
| 804 | |
Rafael J. Wysocki | 2ed8d2b | 2009-03-16 22:34:06 +0100 | [diff] [blame] | 805 | suspend_device_irqs(); |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 806 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 807 | while (!list_empty(&dpm_suspended_list)) { |
| 808 | struct device *dev = to_device(dpm_suspended_list.prev); |
Rafael J. Wysocki | d08a5ac | 2010-11-11 01:50:53 +0100 | [diff] [blame] | 809 | |
| 810 | get_device(dev); |
| 811 | mutex_unlock(&dpm_list_mtx); |
| 812 | |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 813 | error = device_suspend_noirq(dev, state); |
Rafael J. Wysocki | d08a5ac | 2010-11-11 01:50:53 +0100 | [diff] [blame] | 814 | |
| 815 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 816 | if (error) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 817 | pm_dev_err(dev, state, " late", error); |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 818 | suspend_stats.failed_suspend_noirq++; |
| 819 | dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ); |
| 820 | dpm_save_failed_dev(dev_name(dev)); |
Rafael J. Wysocki | d08a5ac | 2010-11-11 01:50:53 +0100 | [diff] [blame] | 821 | put_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 822 | break; |
| 823 | } |
Rafael J. Wysocki | d08a5ac | 2010-11-11 01:50:53 +0100 | [diff] [blame] | 824 | if (!list_empty(&dev->power.entry)) |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 825 | list_move(&dev->power.entry, &dpm_noirq_list); |
Rafael J. Wysocki | d08a5ac | 2010-11-11 01:50:53 +0100 | [diff] [blame] | 826 | put_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 827 | } |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 828 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 829 | if (error) |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 830 | dpm_resume_noirq(resume_event(state)); |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 831 | else |
| 832 | dpm_show_time(starttime, state, "late"); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 833 | return error; |
| 834 | } |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 835 | EXPORT_SYMBOL_GPL(dpm_suspend_noirq); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 836 | |
| 837 | /** |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 838 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. |
Randy Dunlap | 0a88422 | 2010-01-08 14:42:57 -0800 | [diff] [blame] | 839 | * @dev: Device to suspend. |
| 840 | * @state: PM transition of the system being carried out. |
| 841 | * @cb: Suspend callback to execute. |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 842 | */ |
| 843 | static int legacy_suspend(struct device *dev, pm_message_t state, |
| 844 | int (*cb)(struct device *dev, pm_message_t state)) |
| 845 | { |
| 846 | int error; |
| 847 | ktime_t calltime; |
| 848 | |
| 849 | calltime = initcall_debug_start(dev); |
| 850 | |
| 851 | error = cb(dev, state); |
| 852 | suspend_report_result(cb, error); |
| 853 | |
| 854 | initcall_debug_report(dev, calltime, error); |
| 855 | |
| 856 | return error; |
| 857 | } |
| 858 | |
| 859 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 860 | * device_suspend - Execute "suspend" callbacks for given device. |
| 861 | * @dev: Device to handle. |
| 862 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 863 | * @async: If true, the device is being suspended asynchronously. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 864 | */ |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 865 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 866 | { |
| 867 | int error = 0; |
| 868 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 869 | dpm_wait_for_children(dev, async); |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 870 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 871 | if (async_error) |
Rafael J. Wysocki | 1e2ef05 | 2011-07-06 10:51:58 +0200 | [diff] [blame] | 872 | return 0; |
| 873 | |
| 874 | pm_runtime_get_noresume(dev); |
| 875 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
| 876 | pm_wakeup_event(dev, 0); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 877 | |
Rafael J. Wysocki | d83f905 | 2010-12-03 23:14:26 +0100 | [diff] [blame] | 878 | if (pm_wakeup_pending()) { |
Rafael J. Wysocki | 1e2ef05 | 2011-07-06 10:51:58 +0200 | [diff] [blame] | 879 | pm_runtime_put_sync(dev); |
Rafael J. Wysocki | d83f905 | 2010-12-03 23:14:26 +0100 | [diff] [blame] | 880 | async_error = -EBUSY; |
Rafael J. Wysocki | 1e2ef05 | 2011-07-06 10:51:58 +0200 | [diff] [blame] | 881 | return 0; |
Rafael J. Wysocki | d83f905 | 2010-12-03 23:14:26 +0100 | [diff] [blame] | 882 | } |
| 883 | |
Rafael J. Wysocki | 1e2ef05 | 2011-07-06 10:51:58 +0200 | [diff] [blame] | 884 | device_lock(dev); |
| 885 | |
Rafael J. Wysocki | 564b905 | 2011-06-23 01:52:55 +0200 | [diff] [blame] | 886 | if (dev->pm_domain) { |
Rafael J. Wysocki | 4d27e9d | 2011-04-29 00:35:50 +0200 | [diff] [blame] | 887 | pm_dev_dbg(dev, state, "power domain "); |
Rafael J. Wysocki | 564b905 | 2011-06-23 01:52:55 +0200 | [diff] [blame] | 888 | error = pm_op(dev, &dev->pm_domain->ops, state); |
Rafael J. Wysocki | 4d27e9d | 2011-04-29 00:35:50 +0200 | [diff] [blame] | 889 | goto End; |
| 890 | } |
| 891 | |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 892 | if (dev->type && dev->type->pm) { |
| 893 | pm_dev_dbg(dev, state, "type "); |
| 894 | error = pm_op(dev, dev->type->pm, state); |
Rafael J. Wysocki | 4d27e9d | 2011-04-29 00:35:50 +0200 | [diff] [blame] | 895 | goto End; |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 896 | } |
| 897 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 898 | if (dev->class) { |
| 899 | if (dev->class->pm) { |
| 900 | pm_dev_dbg(dev, state, "class "); |
| 901 | error = pm_op(dev, dev->class->pm, state); |
Rafael J. Wysocki | 4d27e9d | 2011-04-29 00:35:50 +0200 | [diff] [blame] | 902 | goto End; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 903 | } else if (dev->class->suspend) { |
| 904 | pm_dev_dbg(dev, state, "legacy class "); |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 905 | error = legacy_suspend(dev, state, dev->class->suspend); |
Rafael J. Wysocki | 4d27e9d | 2011-04-29 00:35:50 +0200 | [diff] [blame] | 906 | goto End; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 907 | } |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 908 | } |
| 909 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 910 | if (dev->bus) { |
| 911 | if (dev->bus->pm) { |
| 912 | pm_dev_dbg(dev, state, ""); |
Rafael J. Wysocki | adf0949 | 2008-10-06 22:46:05 +0200 | [diff] [blame] | 913 | error = pm_op(dev, dev->bus->pm, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 914 | } else if (dev->bus->suspend) { |
| 915 | pm_dev_dbg(dev, state, "legacy "); |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 916 | error = legacy_suspend(dev, state, dev->bus->suspend); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 917 | } |
Rafael J. Wysocki | 7538e3d | 2011-02-16 21:53:17 +0100 | [diff] [blame] | 918 | } |
| 919 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 920 | End: |
Rafael J. Wysocki | 4ca46ff | 2011-10-16 23:34:36 +0200 | [diff] [blame] | 921 | if (!error) { |
| 922 | dev->power.is_suspended = true; |
| 923 | if (dev->power.wakeup_path && dev->parent) |
| 924 | dev->parent->power.wakeup_path = true; |
| 925 | } |
Alan Stern | 6d0e0e8 | 2011-06-18 22:42:09 +0200 | [diff] [blame] | 926 | |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 927 | device_unlock(dev); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 928 | complete_all(&dev->power.completion); |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 929 | |
Rafael J. Wysocki | 1e2ef05 | 2011-07-06 10:51:58 +0200 | [diff] [blame] | 930 | if (error) { |
| 931 | pm_runtime_put_sync(dev); |
Rafael J. Wysocki | 098dff7 | 2010-09-22 22:10:57 +0200 | [diff] [blame] | 932 | async_error = error; |
Rafael J. Wysocki | 1e2ef05 | 2011-07-06 10:51:58 +0200 | [diff] [blame] | 933 | } else if (dev->power.is_suspended) { |
| 934 | __pm_runtime_disable(dev, false); |
| 935 | } |
Rafael J. Wysocki | 098dff7 | 2010-09-22 22:10:57 +0200 | [diff] [blame] | 936 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 937 | return error; |
| 938 | } |
| 939 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 940 | static void async_suspend(void *data, async_cookie_t cookie) |
| 941 | { |
| 942 | struct device *dev = (struct device *)data; |
| 943 | int error; |
| 944 | |
| 945 | error = __device_suspend(dev, pm_transition, true); |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 946 | if (error) { |
| 947 | dpm_save_failed_dev(dev_name(dev)); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 948 | pm_dev_err(dev, pm_transition, " async", error); |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 949 | } |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 950 | |
| 951 | put_device(dev); |
| 952 | } |
| 953 | |
| 954 | static int device_suspend(struct device *dev) |
| 955 | { |
| 956 | INIT_COMPLETION(dev->power.completion); |
| 957 | |
Rafael J. Wysocki | 0e06b4a | 2010-01-23 22:25:15 +0100 | [diff] [blame] | 958 | if (pm_async_enabled && dev->power.async_suspend) { |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 959 | get_device(dev); |
| 960 | async_schedule(async_suspend, dev); |
| 961 | return 0; |
| 962 | } |
| 963 | |
| 964 | return __device_suspend(dev, pm_transition, false); |
| 965 | } |
| 966 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 967 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 968 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
| 969 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 970 | */ |
Rafael J. Wysocki | 91e7c75 | 2011-05-17 23:26:00 +0200 | [diff] [blame] | 971 | int dpm_suspend(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 972 | { |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 973 | ktime_t starttime = ktime_get(); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 974 | int error = 0; |
| 975 | |
Rafael J. Wysocki | 91e7c75 | 2011-05-17 23:26:00 +0200 | [diff] [blame] | 976 | might_sleep(); |
| 977 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 978 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 979 | pm_transition = state; |
| 980 | async_error = 0; |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 981 | while (!list_empty(&dpm_prepared_list)) { |
| 982 | struct device *dev = to_device(dpm_prepared_list.prev); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 983 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 984 | get_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 985 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 986 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 987 | error = device_suspend(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 988 | |
Alan Stern | 1b3cbec | 2008-02-29 11:50:22 -0500 | [diff] [blame] | 989 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 990 | if (error) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 991 | pm_dev_err(dev, state, "", error); |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 992 | dpm_save_failed_dev(dev_name(dev)); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 993 | put_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 994 | break; |
| 995 | } |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 996 | if (!list_empty(&dev->power.entry)) |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 997 | list_move(&dev->power.entry, &dpm_suspended_list); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 998 | put_device(dev); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 999 | if (async_error) |
| 1000 | break; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1001 | } |
| 1002 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 1003 | async_synchronize_full(); |
| 1004 | if (!error) |
| 1005 | error = async_error; |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 1006 | if (error) { |
| 1007 | suspend_stats.failed_suspend++; |
| 1008 | dpm_save_failed_step(SUSPEND_SUSPEND); |
| 1009 | } else |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 1010 | dpm_show_time(starttime, state, NULL); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1011 | return error; |
| 1012 | } |
| 1013 | |
| 1014 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 1015 | * device_prepare - Prepare a device for system power transition. |
| 1016 | * @dev: Device to handle. |
| 1017 | * @state: PM transition of the system being carried out. |
| 1018 | * |
| 1019 | * Execute the ->prepare() callback(s) for given device. No new children of the |
| 1020 | * device may be registered after this function has returned. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1021 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 1022 | static int device_prepare(struct device *dev, pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1023 | { |
| 1024 | int error = 0; |
| 1025 | |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 1026 | device_lock(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1027 | |
Rafael J. Wysocki | 4ca46ff | 2011-10-16 23:34:36 +0200 | [diff] [blame] | 1028 | dev->power.wakeup_path = device_may_wakeup(dev); |
| 1029 | |
Rafael J. Wysocki | 564b905 | 2011-06-23 01:52:55 +0200 | [diff] [blame] | 1030 | if (dev->pm_domain) { |
Rafael J. Wysocki | 4d27e9d | 2011-04-29 00:35:50 +0200 | [diff] [blame] | 1031 | pm_dev_dbg(dev, state, "preparing power domain "); |
Rafael J. Wysocki | 564b905 | 2011-06-23 01:52:55 +0200 | [diff] [blame] | 1032 | if (dev->pm_domain->ops.prepare) |
| 1033 | error = dev->pm_domain->ops.prepare(dev); |
| 1034 | suspend_report_result(dev->pm_domain->ops.prepare, error); |
Rafael J. Wysocki | 4d27e9d | 2011-04-29 00:35:50 +0200 | [diff] [blame] | 1035 | if (error) |
| 1036 | goto End; |
| 1037 | } else if (dev->type && dev->type->pm) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1038 | pm_dev_dbg(dev, state, "preparing type "); |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 1039 | if (dev->type->pm->prepare) |
| 1040 | error = dev->type->pm->prepare(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1041 | suspend_report_result(dev->type->pm->prepare, error); |
| 1042 | if (error) |
| 1043 | goto End; |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 1044 | } else if (dev->class && dev->class->pm) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1045 | pm_dev_dbg(dev, state, "preparing class "); |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 1046 | if (dev->class->pm->prepare) |
| 1047 | error = dev->class->pm->prepare(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1048 | suspend_report_result(dev->class->pm->prepare, error); |
Rafael J. Wysocki | 7538e3d | 2011-02-16 21:53:17 +0100 | [diff] [blame] | 1049 | if (error) |
| 1050 | goto End; |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 1051 | } else if (dev->bus && dev->bus->pm) { |
| 1052 | pm_dev_dbg(dev, state, "preparing "); |
| 1053 | if (dev->bus->pm->prepare) |
| 1054 | error = dev->bus->pm->prepare(dev); |
| 1055 | suspend_report_result(dev->bus->pm->prepare, error); |
Rafael J. Wysocki | 7538e3d | 2011-02-16 21:53:17 +0100 | [diff] [blame] | 1056 | } |
| 1057 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1058 | End: |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 1059 | device_unlock(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1060 | |
| 1061 | return error; |
| 1062 | } |
| 1063 | |
| 1064 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 1065 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
| 1066 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1067 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 1068 | * Execute the ->prepare() callback(s) for all devices. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1069 | */ |
Rafael J. Wysocki | 91e7c75 | 2011-05-17 23:26:00 +0200 | [diff] [blame] | 1070 | int dpm_prepare(pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1071 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1072 | int error = 0; |
| 1073 | |
Rafael J. Wysocki | 91e7c75 | 2011-05-17 23:26:00 +0200 | [diff] [blame] | 1074 | might_sleep(); |
| 1075 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1076 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1077 | while (!list_empty(&dpm_list)) { |
| 1078 | struct device *dev = to_device(dpm_list.next); |
| 1079 | |
| 1080 | get_device(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1081 | mutex_unlock(&dpm_list_mtx); |
| 1082 | |
Rafael J. Wysocki | 1e2ef05 | 2011-07-06 10:51:58 +0200 | [diff] [blame] | 1083 | error = device_prepare(dev, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1084 | |
| 1085 | mutex_lock(&dpm_list_mtx); |
| 1086 | if (error) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1087 | if (error == -EAGAIN) { |
| 1088 | put_device(dev); |
Sebastian Ott | 886a7a3 | 2009-07-08 13:26:05 +0200 | [diff] [blame] | 1089 | error = 0; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1090 | continue; |
| 1091 | } |
Rafael J. Wysocki | 1e75227 | 2010-12-03 22:58:05 +0100 | [diff] [blame] | 1092 | printk(KERN_INFO "PM: Device %s not prepared " |
| 1093 | "for power transition: code %d\n", |
Rafael J. Wysocki | 5c1a07a | 2010-12-24 15:03:34 +0100 | [diff] [blame] | 1094 | dev_name(dev), error); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1095 | put_device(dev); |
| 1096 | break; |
| 1097 | } |
Alan Stern | f76b168b | 2011-06-18 20:22:23 +0200 | [diff] [blame] | 1098 | dev->power.is_prepared = true; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1099 | if (!list_empty(&dev->power.entry)) |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 1100 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1101 | put_device(dev); |
| 1102 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1103 | mutex_unlock(&dpm_list_mtx); |
| 1104 | return error; |
| 1105 | } |
| 1106 | |
| 1107 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 1108 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
| 1109 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1110 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 1111 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
| 1112 | * callbacks for them. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1113 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 1114 | int dpm_suspend_start(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1115 | { |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1116 | int error; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1117 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1118 | error = dpm_prepare(state); |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 1119 | if (error) { |
| 1120 | suspend_stats.failed_prepare++; |
| 1121 | dpm_save_failed_step(SUSPEND_PREPARE); |
| 1122 | } else |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1123 | error = dpm_suspend(state); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1124 | return error; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1125 | } |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 1126 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1127 | |
| 1128 | void __suspend_report_result(const char *function, void *fn, int ret) |
| 1129 | { |
Bjorn Helgaas | c80cfb0 | 2008-10-15 22:01:35 -0700 | [diff] [blame] | 1130 | if (ret) |
| 1131 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1132 | } |
| 1133 | EXPORT_SYMBOL_GPL(__suspend_report_result); |
Rafael J. Wysocki | f8824ce | 2010-01-27 23:47:38 +0100 | [diff] [blame] | 1134 | |
| 1135 | /** |
| 1136 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. |
| 1137 | * @dev: Device to wait for. |
| 1138 | * @subordinate: Device that needs to wait for @dev. |
| 1139 | */ |
Rafael J. Wysocki | 098dff7 | 2010-09-22 22:10:57 +0200 | [diff] [blame] | 1140 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
Rafael J. Wysocki | f8824ce | 2010-01-27 23:47:38 +0100 | [diff] [blame] | 1141 | { |
| 1142 | dpm_wait(dev, subordinate->power.async_suspend); |
Rafael J. Wysocki | 098dff7 | 2010-09-22 22:10:57 +0200 | [diff] [blame] | 1143 | return async_error; |
Rafael J. Wysocki | f8824ce | 2010-01-27 23:47:38 +0100 | [diff] [blame] | 1144 | } |
| 1145 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); |