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> |
Preeti U Murthy | 8651f97 | 2012-07-09 10:12:56 +0200 | [diff] [blame] | 31 | #include <linux/cpuidle.h> |
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 | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 35 | typedef int (*pm_callback_t)(struct device *); |
| 36 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 37 | /* |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 38 | * 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] | 39 | * because children are guaranteed to be discovered after parents, and |
| 40 | * are inserted at the back of the list on discovery. |
| 41 | * |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 42 | * Since device_pm_add() may be called with a device lock held, |
| 43 | * we must never try to acquire a device lock while holding |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 44 | * dpm_list_mutex. |
| 45 | */ |
| 46 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 47 | LIST_HEAD(dpm_list); |
Sachin Kamat | 7664e96 | 2012-07-17 22:38:08 +0200 | [diff] [blame] | 48 | static LIST_HEAD(dpm_prepared_list); |
| 49 | static LIST_HEAD(dpm_suspended_list); |
| 50 | static LIST_HEAD(dpm_late_early_list); |
| 51 | static LIST_HEAD(dpm_noirq_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 53 | struct suspend_stats suspend_stats; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 54 | static DEFINE_MUTEX(dpm_list_mtx); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 55 | static pm_message_t pm_transition; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Rafael J. Wysocki | 098dff7 | 2010-09-22 22:10:57 +0200 | [diff] [blame] | 57 | static int async_error; |
| 58 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 59 | /** |
Rafael J. Wysocki | e91c11b | 2012-08-06 01:44:28 +0200 | [diff] [blame] | 60 | * device_pm_sleep_init - Initialize system suspend-related device fields. |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 61 | * @dev: Device object being initialized. |
| 62 | */ |
Rafael J. Wysocki | e91c11b | 2012-08-06 01:44:28 +0200 | [diff] [blame] | 63 | void device_pm_sleep_init(struct device *dev) |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 64 | { |
Alan Stern | f76b168b | 2011-06-18 20:22:23 +0200 | [diff] [blame] | 65 | dev->power.is_prepared = false; |
Alan Stern | 6d0e0e8 | 2011-06-18 22:42:09 +0200 | [diff] [blame] | 66 | dev->power.is_suspended = false; |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 67 | init_completion(&dev->power.completion); |
Colin Cross | 152e1d5 | 2010-09-03 01:24:07 +0200 | [diff] [blame] | 68 | complete_all(&dev->power.completion); |
Rafael J. Wysocki | 074037e | 2010-09-22 22:09:10 +0200 | [diff] [blame] | 69 | dev->power.wakeup = NULL; |
Rafael J. Wysocki | 22110fa | 2011-04-26 11:33:09 +0200 | [diff] [blame] | 70 | INIT_LIST_HEAD(&dev->power.entry); |
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 | |
Rafael J. Wysocki | b2df1d4 | 2012-06-21 00:19:33 +0200 | [diff] [blame] | 166 | if (pm_print_times_enabled) { |
Rafael J. Wysocki | 0c6aebe | 2011-12-03 00:23:43 +0100 | [diff] [blame] | 167 | pr_info("calling %s+ @ %i, parent: %s\n", |
| 168 | dev_name(dev), task_pid_nr(current), |
| 169 | dev->parent ? dev_name(dev->parent) : "none"); |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 170 | calltime = ktime_get(); |
| 171 | } |
| 172 | |
| 173 | return calltime; |
| 174 | } |
| 175 | |
| 176 | static void initcall_debug_report(struct device *dev, ktime_t calltime, |
| 177 | int error) |
| 178 | { |
| 179 | ktime_t delta, rettime; |
| 180 | |
Rafael J. Wysocki | b2df1d4 | 2012-06-21 00:19:33 +0200 | [diff] [blame] | 181 | if (pm_print_times_enabled) { |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 182 | rettime = ktime_get(); |
| 183 | delta = ktime_sub(rettime, calltime); |
| 184 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), |
| 185 | error, (unsigned long long)ktime_to_ns(delta) >> 10); |
| 186 | } |
| 187 | } |
| 188 | |
Cornelia Huck | ffa6a70 | 2009-03-04 12:44:00 +0100 | [diff] [blame] | 189 | /** |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 190 | * dpm_wait - Wait for a PM operation to complete. |
| 191 | * @dev: Device to wait for. |
| 192 | * @async: If unset, wait only if the device's power.async_suspend flag is set. |
| 193 | */ |
| 194 | static void dpm_wait(struct device *dev, bool async) |
| 195 | { |
| 196 | if (!dev) |
| 197 | return; |
| 198 | |
Rafael J. Wysocki | 0e06b4a | 2010-01-23 22:25:15 +0100 | [diff] [blame] | 199 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 200 | wait_for_completion(&dev->power.completion); |
| 201 | } |
| 202 | |
| 203 | static int dpm_wait_fn(struct device *dev, void *async_ptr) |
| 204 | { |
| 205 | dpm_wait(dev, *((bool *)async_ptr)); |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | static void dpm_wait_for_children(struct device *dev, bool async) |
| 210 | { |
| 211 | device_for_each_child(dev, &async, dpm_wait_fn); |
| 212 | } |
| 213 | |
| 214 | /** |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 215 | * pm_op - Return the PM operation appropriate for given PM event. |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 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 | */ |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 219 | static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 220 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 221 | switch (state.event) { |
| 222 | #ifdef CONFIG_SUSPEND |
| 223 | case PM_EVENT_SUSPEND: |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 224 | return ops->suspend; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 225 | case PM_EVENT_RESUME: |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 226 | return ops->resume; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 227 | #endif /* CONFIG_SUSPEND */ |
Rafael J. Wysocki | 1f112ce | 2011-04-11 22:54:42 +0200 | [diff] [blame] | 228 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 229 | case PM_EVENT_FREEZE: |
| 230 | case PM_EVENT_QUIESCE: |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 231 | return ops->freeze; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 232 | case PM_EVENT_HIBERNATE: |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 233 | return ops->poweroff; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 234 | case PM_EVENT_THAW: |
| 235 | case PM_EVENT_RECOVER: |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 236 | return ops->thaw; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 237 | break; |
| 238 | case PM_EVENT_RESTORE: |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 239 | return ops->restore; |
Rafael J. Wysocki | 1f112ce | 2011-04-11 22:54:42 +0200 | [diff] [blame] | 240 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 241 | } |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame] | 242 | |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 243 | return NULL; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 244 | } |
| 245 | |
| 246 | /** |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 247 | * pm_late_early_op - Return the PM operation appropriate for given PM event. |
| 248 | * @ops: PM operations to choose from. |
| 249 | * @state: PM transition of the system being carried out. |
| 250 | * |
| 251 | * Runtime PM is disabled for @dev while this function is being executed. |
| 252 | */ |
| 253 | static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops, |
| 254 | pm_message_t state) |
| 255 | { |
| 256 | switch (state.event) { |
| 257 | #ifdef CONFIG_SUSPEND |
| 258 | case PM_EVENT_SUSPEND: |
| 259 | return ops->suspend_late; |
| 260 | case PM_EVENT_RESUME: |
| 261 | return ops->resume_early; |
| 262 | #endif /* CONFIG_SUSPEND */ |
| 263 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
| 264 | case PM_EVENT_FREEZE: |
| 265 | case PM_EVENT_QUIESCE: |
| 266 | return ops->freeze_late; |
| 267 | case PM_EVENT_HIBERNATE: |
| 268 | return ops->poweroff_late; |
| 269 | case PM_EVENT_THAW: |
| 270 | case PM_EVENT_RECOVER: |
| 271 | return ops->thaw_early; |
| 272 | case PM_EVENT_RESTORE: |
| 273 | return ops->restore_early; |
| 274 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
| 275 | } |
| 276 | |
| 277 | return NULL; |
| 278 | } |
| 279 | |
| 280 | /** |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 281 | * pm_noirq_op - Return the PM operation appropriate for given PM event. |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 282 | * @ops: PM operations to choose from. |
| 283 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 284 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 285 | * The driver of @dev will not receive interrupts while this function is being |
| 286 | * executed. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 287 | */ |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 288 | static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 289 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 290 | switch (state.event) { |
| 291 | #ifdef CONFIG_SUSPEND |
| 292 | case PM_EVENT_SUSPEND: |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 293 | return ops->suspend_noirq; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 294 | case PM_EVENT_RESUME: |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 295 | return ops->resume_noirq; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 296 | #endif /* CONFIG_SUSPEND */ |
Rafael J. Wysocki | 1f112ce | 2011-04-11 22:54:42 +0200 | [diff] [blame] | 297 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 298 | case PM_EVENT_FREEZE: |
| 299 | case PM_EVENT_QUIESCE: |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 300 | return ops->freeze_noirq; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 301 | case PM_EVENT_HIBERNATE: |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 302 | return ops->poweroff_noirq; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 303 | case PM_EVENT_THAW: |
| 304 | case PM_EVENT_RECOVER: |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 305 | return ops->thaw_noirq; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 306 | case PM_EVENT_RESTORE: |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 307 | return ops->restore_noirq; |
Rafael J. Wysocki | 1f112ce | 2011-04-11 22:54:42 +0200 | [diff] [blame] | 308 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 309 | } |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame] | 310 | |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 311 | return NULL; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 312 | } |
| 313 | |
| 314 | static char *pm_verb(int event) |
| 315 | { |
| 316 | switch (event) { |
| 317 | case PM_EVENT_SUSPEND: |
| 318 | return "suspend"; |
| 319 | case PM_EVENT_RESUME: |
| 320 | return "resume"; |
| 321 | case PM_EVENT_FREEZE: |
| 322 | return "freeze"; |
| 323 | case PM_EVENT_QUIESCE: |
| 324 | return "quiesce"; |
| 325 | case PM_EVENT_HIBERNATE: |
| 326 | return "hibernate"; |
| 327 | case PM_EVENT_THAW: |
| 328 | return "thaw"; |
| 329 | case PM_EVENT_RESTORE: |
| 330 | return "restore"; |
| 331 | case PM_EVENT_RECOVER: |
| 332 | return "recover"; |
| 333 | default: |
| 334 | return "(unknown PM event)"; |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) |
| 339 | { |
| 340 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), |
| 341 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? |
| 342 | ", may wakeup" : ""); |
| 343 | } |
| 344 | |
| 345 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, |
| 346 | int error) |
| 347 | { |
| 348 | 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] | 349 | dev_name(dev), pm_verb(state.event), info, error); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 350 | } |
| 351 | |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 352 | static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) |
| 353 | { |
| 354 | ktime_t calltime; |
Kevin Cernekee | 0702d9ee | 2010-09-20 22:32:10 +0200 | [diff] [blame] | 355 | u64 usecs64; |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 356 | int usecs; |
| 357 | |
| 358 | calltime = ktime_get(); |
| 359 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); |
| 360 | do_div(usecs64, NSEC_PER_USEC); |
| 361 | usecs = usecs64; |
| 362 | if (usecs == 0) |
| 363 | usecs = 1; |
| 364 | pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n", |
| 365 | info ?: "", info ? " " : "", pm_verb(state.event), |
| 366 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); |
| 367 | } |
| 368 | |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 369 | static int dpm_run_callback(pm_callback_t cb, struct device *dev, |
| 370 | pm_message_t state, char *info) |
| 371 | { |
| 372 | ktime_t calltime; |
| 373 | int error; |
| 374 | |
| 375 | if (!cb) |
| 376 | return 0; |
| 377 | |
| 378 | calltime = initcall_debug_start(dev); |
| 379 | |
| 380 | pm_dev_dbg(dev, state, info); |
| 381 | error = cb(dev); |
| 382 | suspend_report_result(cb, error); |
| 383 | |
| 384 | initcall_debug_report(dev, calltime, error); |
| 385 | |
| 386 | return error; |
| 387 | } |
| 388 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 389 | /*------------------------- Resume routines -------------------------*/ |
| 390 | |
| 391 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 392 | * device_resume_noirq - Execute an "early resume" callback for given device. |
| 393 | * @dev: Device to handle. |
| 394 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 395 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 396 | * The driver of @dev will not receive interrupts while this function is being |
| 397 | * executed. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 398 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 399 | static int device_resume_noirq(struct device *dev, pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 400 | { |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 401 | pm_callback_t callback = NULL; |
| 402 | char *info = NULL; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 403 | int error = 0; |
| 404 | |
| 405 | TRACE_DEVICE(dev); |
| 406 | TRACE_RESUME(0); |
| 407 | |
Rafael J. Wysocki | dbf3741 | 2012-08-06 01:46:39 +0200 | [diff] [blame] | 408 | if (dev->power.syscore) |
| 409 | goto Out; |
| 410 | |
Rafael J. Wysocki | 564b905 | 2011-06-23 01:52:55 +0200 | [diff] [blame] | 411 | if (dev->pm_domain) { |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 412 | info = "noirq power domain "; |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 413 | callback = pm_noirq_op(&dev->pm_domain->ops, state); |
Rafael J. Wysocki | 4d27e9d | 2011-04-29 00:35:50 +0200 | [diff] [blame] | 414 | } else if (dev->type && dev->type->pm) { |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 415 | info = "noirq type "; |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 416 | callback = pm_noirq_op(dev->type->pm, state); |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 417 | } else if (dev->class && dev->class->pm) { |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 418 | info = "noirq class "; |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 419 | callback = pm_noirq_op(dev->class->pm, state); |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 420 | } else if (dev->bus && dev->bus->pm) { |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 421 | info = "noirq bus "; |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 422 | callback = pm_noirq_op(dev->bus->pm, state); |
Dominik Brodowski | e7176a3 | 2010-03-15 21:43:11 +0100 | [diff] [blame] | 423 | } |
| 424 | |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 425 | if (!callback && dev->driver && dev->driver->pm) { |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 426 | info = "noirq driver "; |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 427 | callback = pm_noirq_op(dev->driver->pm, state); |
| 428 | } |
| 429 | |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 430 | error = dpm_run_callback(callback, dev, state, info); |
| 431 | |
Rafael J. Wysocki | dbf3741 | 2012-08-06 01:46:39 +0200 | [diff] [blame] | 432 | Out: |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 433 | TRACE_RESUME(error); |
| 434 | return error; |
| 435 | } |
| 436 | |
| 437 | /** |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 438 | * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices. |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 439 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 440 | * |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 441 | * Call the "noirq" resume handlers for all devices in dpm_noirq_list and |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 442 | * enable device drivers to receive interrupts. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 443 | */ |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 444 | static void dpm_resume_noirq(pm_message_t state) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 445 | { |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 446 | ktime_t starttime = ktime_get(); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 447 | |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 448 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 449 | while (!list_empty(&dpm_noirq_list)) { |
| 450 | struct device *dev = to_device(dpm_noirq_list.next); |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 451 | int error; |
Rafael J. Wysocki | d08a5ac | 2010-11-11 01:50:53 +0100 | [diff] [blame] | 452 | |
| 453 | get_device(dev); |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 454 | list_move_tail(&dev->power.entry, &dpm_late_early_list); |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 455 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 456 | |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 457 | error = device_resume_noirq(dev, state); |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 458 | if (error) { |
| 459 | suspend_stats.failed_resume_noirq++; |
| 460 | dpm_save_failed_step(SUSPEND_RESUME_NOIRQ); |
| 461 | dpm_save_failed_dev(dev_name(dev)); |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 462 | pm_dev_err(dev, state, " noirq", error); |
| 463 | } |
| 464 | |
| 465 | mutex_lock(&dpm_list_mtx); |
| 466 | put_device(dev); |
| 467 | } |
| 468 | mutex_unlock(&dpm_list_mtx); |
| 469 | dpm_show_time(starttime, state, "noirq"); |
| 470 | resume_device_irqs(); |
Preeti U Murthy | 8651f97 | 2012-07-09 10:12:56 +0200 | [diff] [blame] | 471 | cpuidle_resume(); |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 472 | } |
| 473 | |
| 474 | /** |
| 475 | * device_resume_early - Execute an "early resume" callback for given device. |
| 476 | * @dev: Device to handle. |
| 477 | * @state: PM transition of the system being carried out. |
| 478 | * |
| 479 | * Runtime PM is disabled for @dev while this function is being executed. |
| 480 | */ |
| 481 | static int device_resume_early(struct device *dev, pm_message_t state) |
| 482 | { |
| 483 | pm_callback_t callback = NULL; |
| 484 | char *info = NULL; |
| 485 | int error = 0; |
| 486 | |
| 487 | TRACE_DEVICE(dev); |
| 488 | TRACE_RESUME(0); |
| 489 | |
Rafael J. Wysocki | dbf3741 | 2012-08-06 01:46:39 +0200 | [diff] [blame] | 490 | if (dev->power.syscore) |
| 491 | goto Out; |
| 492 | |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 493 | if (dev->pm_domain) { |
| 494 | info = "early power domain "; |
| 495 | callback = pm_late_early_op(&dev->pm_domain->ops, state); |
| 496 | } else if (dev->type && dev->type->pm) { |
| 497 | info = "early type "; |
| 498 | callback = pm_late_early_op(dev->type->pm, state); |
| 499 | } else if (dev->class && dev->class->pm) { |
| 500 | info = "early class "; |
| 501 | callback = pm_late_early_op(dev->class->pm, state); |
| 502 | } else if (dev->bus && dev->bus->pm) { |
| 503 | info = "early bus "; |
| 504 | callback = pm_late_early_op(dev->bus->pm, state); |
| 505 | } |
| 506 | |
| 507 | if (!callback && dev->driver && dev->driver->pm) { |
| 508 | info = "early driver "; |
| 509 | callback = pm_late_early_op(dev->driver->pm, state); |
| 510 | } |
| 511 | |
| 512 | error = dpm_run_callback(callback, dev, state, info); |
| 513 | |
Rafael J. Wysocki | dbf3741 | 2012-08-06 01:46:39 +0200 | [diff] [blame] | 514 | Out: |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 515 | TRACE_RESUME(error); |
Rafael J. Wysocki | 9f6d8f6 | 2012-12-22 23:59:01 +0100 | [diff] [blame^] | 516 | |
| 517 | pm_runtime_enable(dev); |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 518 | return error; |
| 519 | } |
| 520 | |
| 521 | /** |
| 522 | * dpm_resume_early - Execute "early resume" callbacks for all devices. |
| 523 | * @state: PM transition of the system being carried out. |
| 524 | */ |
| 525 | static void dpm_resume_early(pm_message_t state) |
| 526 | { |
| 527 | ktime_t starttime = ktime_get(); |
| 528 | |
| 529 | mutex_lock(&dpm_list_mtx); |
| 530 | while (!list_empty(&dpm_late_early_list)) { |
| 531 | struct device *dev = to_device(dpm_late_early_list.next); |
| 532 | int error; |
| 533 | |
| 534 | get_device(dev); |
| 535 | list_move_tail(&dev->power.entry, &dpm_suspended_list); |
| 536 | mutex_unlock(&dpm_list_mtx); |
| 537 | |
| 538 | error = device_resume_early(dev, state); |
| 539 | if (error) { |
| 540 | suspend_stats.failed_resume_early++; |
| 541 | dpm_save_failed_step(SUSPEND_RESUME_EARLY); |
| 542 | dpm_save_failed_dev(dev_name(dev)); |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 543 | pm_dev_err(dev, state, " early", error); |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 544 | } |
Rafael J. Wysocki | d08a5ac | 2010-11-11 01:50:53 +0100 | [diff] [blame] | 545 | |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 546 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | d08a5ac | 2010-11-11 01:50:53 +0100 | [diff] [blame] | 547 | put_device(dev); |
| 548 | } |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 549 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 550 | dpm_show_time(starttime, state, "early"); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 551 | } |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 552 | |
| 553 | /** |
| 554 | * dpm_resume_start - Execute "noirq" and "early" device callbacks. |
| 555 | * @state: PM transition of the system being carried out. |
| 556 | */ |
| 557 | void dpm_resume_start(pm_message_t state) |
| 558 | { |
| 559 | dpm_resume_noirq(state); |
| 560 | dpm_resume_early(state); |
| 561 | } |
| 562 | EXPORT_SYMBOL_GPL(dpm_resume_start); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 563 | |
| 564 | /** |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 565 | * device_resume - Execute "resume" callbacks for given device. |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 566 | * @dev: Device to handle. |
| 567 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 568 | * @async: If true, the device is being resumed asynchronously. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 569 | */ |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 570 | 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] | 571 | { |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 572 | pm_callback_t callback = NULL; |
| 573 | char *info = NULL; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 574 | int error = 0; |
| 575 | |
| 576 | TRACE_DEVICE(dev); |
| 577 | TRACE_RESUME(0); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 578 | |
Rafael J. Wysocki | dbf3741 | 2012-08-06 01:46:39 +0200 | [diff] [blame] | 579 | if (dev->power.syscore) |
| 580 | goto Complete; |
| 581 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 582 | dpm_wait(dev->parent, async); |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 583 | device_lock(dev); |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 584 | |
Alan Stern | f76b168b | 2011-06-18 20:22:23 +0200 | [diff] [blame] | 585 | /* |
| 586 | * This is a fib. But we'll allow new children to be added below |
| 587 | * a resumed device, even if the device hasn't been completed yet. |
| 588 | */ |
| 589 | dev->power.is_prepared = false; |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 590 | |
Alan Stern | 6d0e0e8 | 2011-06-18 22:42:09 +0200 | [diff] [blame] | 591 | if (!dev->power.is_suspended) |
| 592 | goto Unlock; |
| 593 | |
Rafael J. Wysocki | 564b905 | 2011-06-23 01:52:55 +0200 | [diff] [blame] | 594 | if (dev->pm_domain) { |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 595 | info = "power domain "; |
| 596 | callback = pm_op(&dev->pm_domain->ops, state); |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 597 | goto Driver; |
Rafael J. Wysocki | 7538e3d | 2011-02-16 21:53:17 +0100 | [diff] [blame] | 598 | } |
| 599 | |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 600 | if (dev->type && dev->type->pm) { |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 601 | info = "type "; |
| 602 | callback = pm_op(dev->type->pm, state); |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 603 | goto Driver; |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 604 | } |
| 605 | |
| 606 | if (dev->class) { |
| 607 | if (dev->class->pm) { |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 608 | info = "class "; |
| 609 | callback = pm_op(dev->class->pm, state); |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 610 | goto Driver; |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 611 | } else if (dev->class->resume) { |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 612 | info = "legacy class "; |
| 613 | callback = dev->class->resume; |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 614 | goto End; |
| 615 | } |
| 616 | } |
| 617 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 618 | if (dev->bus) { |
| 619 | if (dev->bus->pm) { |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 620 | info = "bus "; |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 621 | callback = pm_op(dev->bus->pm, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 622 | } else if (dev->bus->resume) { |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 623 | info = "legacy bus "; |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 624 | callback = dev->bus->resume; |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 625 | goto End; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 626 | } |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 627 | } |
| 628 | |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 629 | Driver: |
| 630 | if (!callback && dev->driver && dev->driver->pm) { |
| 631 | info = "driver "; |
| 632 | callback = pm_op(dev->driver->pm, state); |
| 633 | } |
| 634 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 635 | End: |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 636 | error = dpm_run_callback(callback, dev, state, info); |
Alan Stern | 6d0e0e8 | 2011-06-18 22:42:09 +0200 | [diff] [blame] | 637 | dev->power.is_suspended = false; |
| 638 | |
| 639 | Unlock: |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 640 | device_unlock(dev); |
Rafael J. Wysocki | dbf3741 | 2012-08-06 01:46:39 +0200 | [diff] [blame] | 641 | |
| 642 | Complete: |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 643 | complete_all(&dev->power.completion); |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 644 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 645 | TRACE_RESUME(error); |
Rafael J. Wysocki | 1e2ef05 | 2011-07-06 10:51:58 +0200 | [diff] [blame] | 646 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 647 | return error; |
| 648 | } |
| 649 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 650 | static void async_resume(void *data, async_cookie_t cookie) |
| 651 | { |
| 652 | struct device *dev = (struct device *)data; |
| 653 | int error; |
| 654 | |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 655 | error = device_resume(dev, pm_transition, true); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 656 | if (error) |
| 657 | pm_dev_err(dev, pm_transition, " async", error); |
| 658 | put_device(dev); |
| 659 | } |
| 660 | |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 661 | static bool is_async(struct device *dev) |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 662 | { |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 663 | return dev->power.async_suspend && pm_async_enabled |
| 664 | && !pm_trace_is_enabled(); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 665 | } |
| 666 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 667 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 668 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
| 669 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 670 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 671 | * Execute the appropriate "resume" callback for all devices whose status |
| 672 | * indicates that they are suspended. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 673 | */ |
Rafael J. Wysocki | 91e7c75 | 2011-05-17 23:26:00 +0200 | [diff] [blame] | 674 | void dpm_resume(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 675 | { |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 676 | struct device *dev; |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 677 | ktime_t starttime = ktime_get(); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 678 | |
Rafael J. Wysocki | 91e7c75 | 2011-05-17 23:26:00 +0200 | [diff] [blame] | 679 | might_sleep(); |
| 680 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 681 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 682 | pm_transition = state; |
Rafael J. Wysocki | 098dff7 | 2010-09-22 22:10:57 +0200 | [diff] [blame] | 683 | async_error = 0; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 684 | |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 685 | list_for_each_entry(dev, &dpm_suspended_list, power.entry) { |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 686 | INIT_COMPLETION(dev->power.completion); |
| 687 | if (is_async(dev)) { |
| 688 | get_device(dev); |
| 689 | async_schedule(async_resume, dev); |
| 690 | } |
| 691 | } |
| 692 | |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 693 | while (!list_empty(&dpm_suspended_list)) { |
| 694 | dev = to_device(dpm_suspended_list.next); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 695 | get_device(dev); |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 696 | if (!is_async(dev)) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 697 | int error; |
| 698 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 699 | mutex_unlock(&dpm_list_mtx); |
| 700 | |
Rafael J. Wysocki | 97df8c1 | 2010-01-23 22:25:31 +0100 | [diff] [blame] | 701 | error = device_resume(dev, state, false); |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 702 | if (error) { |
| 703 | suspend_stats.failed_resume++; |
| 704 | dpm_save_failed_step(SUSPEND_RESUME); |
| 705 | dpm_save_failed_dev(dev_name(dev)); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 706 | pm_dev_err(dev, state, "", error); |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 707 | } |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 708 | |
| 709 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 710 | } |
| 711 | if (!list_empty(&dev->power.entry)) |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 712 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 713 | put_device(dev); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 714 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 715 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 716 | async_synchronize_full(); |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 717 | dpm_show_time(starttime, state, NULL); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 718 | } |
| 719 | |
| 720 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 721 | * device_complete - Complete a PM transition for given device. |
| 722 | * @dev: Device to handle. |
| 723 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 724 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 725 | static void device_complete(struct device *dev, pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 726 | { |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 727 | void (*callback)(struct device *) = NULL; |
| 728 | char *info = NULL; |
| 729 | |
Rafael J. Wysocki | dbf3741 | 2012-08-06 01:46:39 +0200 | [diff] [blame] | 730 | if (dev->power.syscore) |
| 731 | return; |
| 732 | |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 733 | device_lock(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 734 | |
Rafael J. Wysocki | 564b905 | 2011-06-23 01:52:55 +0200 | [diff] [blame] | 735 | if (dev->pm_domain) { |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 736 | info = "completing power domain "; |
| 737 | callback = dev->pm_domain->ops.complete; |
Rafael J. Wysocki | 4d27e9d | 2011-04-29 00:35:50 +0200 | [diff] [blame] | 738 | } else if (dev->type && dev->type->pm) { |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 739 | info = "completing type "; |
| 740 | callback = dev->type->pm->complete; |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 741 | } else if (dev->class && dev->class->pm) { |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 742 | info = "completing class "; |
| 743 | callback = dev->class->pm->complete; |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 744 | } else if (dev->bus && dev->bus->pm) { |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 745 | info = "completing bus "; |
| 746 | callback = dev->bus->pm->complete; |
| 747 | } |
| 748 | |
| 749 | if (!callback && dev->driver && dev->driver->pm) { |
| 750 | info = "completing driver "; |
| 751 | callback = dev->driver->pm->complete; |
| 752 | } |
| 753 | |
| 754 | if (callback) { |
| 755 | pm_dev_dbg(dev, state, info); |
| 756 | callback(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 757 | } |
| 758 | |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 759 | device_unlock(dev); |
Alan Stern | 88d2613 | 2012-09-19 21:59:02 +0200 | [diff] [blame] | 760 | |
| 761 | pm_runtime_put_sync(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 762 | } |
| 763 | |
| 764 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 765 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
| 766 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 767 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 768 | * Execute the ->complete() callbacks for all devices whose PM status is not |
| 769 | * DPM_ON (this allows new devices to be registered). |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 770 | */ |
Rafael J. Wysocki | 91e7c75 | 2011-05-17 23:26:00 +0200 | [diff] [blame] | 771 | void dpm_complete(pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 772 | { |
| 773 | struct list_head list; |
| 774 | |
Rafael J. Wysocki | 91e7c75 | 2011-05-17 23:26:00 +0200 | [diff] [blame] | 775 | might_sleep(); |
| 776 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 777 | INIT_LIST_HEAD(&list); |
| 778 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 779 | while (!list_empty(&dpm_prepared_list)) { |
| 780 | struct device *dev = to_device(dpm_prepared_list.prev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 781 | |
| 782 | get_device(dev); |
Alan Stern | f76b168b | 2011-06-18 20:22:23 +0200 | [diff] [blame] | 783 | dev->power.is_prepared = false; |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 784 | list_move(&dev->power.entry, &list); |
| 785 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 786 | |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 787 | device_complete(dev, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 788 | |
Rafael J. Wysocki | 5b219a5 | 2010-12-16 00:51:08 +0100 | [diff] [blame] | 789 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 790 | put_device(dev); |
| 791 | } |
| 792 | list_splice(&list, &dpm_list); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 793 | mutex_unlock(&dpm_list_mtx); |
| 794 | } |
| 795 | |
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 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
| 798 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 799 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 800 | * Execute "resume" callbacks for all devices and complete the PM transition of |
| 801 | * the system. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 802 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 803 | void dpm_resume_end(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 804 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 805 | dpm_resume(state); |
| 806 | dpm_complete(state); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 807 | } |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 808 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 809 | |
| 810 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 811 | /*------------------------- Suspend routines -------------------------*/ |
| 812 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 813 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 814 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
| 815 | * @sleep_state: PM message representing a sleep state. |
| 816 | * |
| 817 | * Return a PM message representing the resume event corresponding to given |
| 818 | * sleep state. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 819 | */ |
| 820 | static pm_message_t resume_event(pm_message_t sleep_state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 821 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 822 | switch (sleep_state.event) { |
| 823 | case PM_EVENT_SUSPEND: |
| 824 | return PMSG_RESUME; |
| 825 | case PM_EVENT_FREEZE: |
| 826 | case PM_EVENT_QUIESCE: |
| 827 | return PMSG_RECOVER; |
| 828 | case PM_EVENT_HIBERNATE: |
| 829 | return PMSG_RESTORE; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 830 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 831 | return PMSG_ON; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 832 | } |
| 833 | |
| 834 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 835 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
| 836 | * @dev: Device to handle. |
| 837 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 838 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 839 | * The driver of @dev will not receive interrupts while this function is being |
| 840 | * executed. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 841 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 842 | 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] | 843 | { |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 844 | pm_callback_t callback = NULL; |
| 845 | char *info = NULL; |
Dominik Brodowski | e7176a3 | 2010-03-15 21:43:11 +0100 | [diff] [blame] | 846 | |
Rafael J. Wysocki | dbf3741 | 2012-08-06 01:46:39 +0200 | [diff] [blame] | 847 | if (dev->power.syscore) |
| 848 | return 0; |
| 849 | |
Rafael J. Wysocki | 564b905 | 2011-06-23 01:52:55 +0200 | [diff] [blame] | 850 | if (dev->pm_domain) { |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 851 | info = "noirq power domain "; |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 852 | callback = pm_noirq_op(&dev->pm_domain->ops, state); |
Rafael J. Wysocki | 4d27e9d | 2011-04-29 00:35:50 +0200 | [diff] [blame] | 853 | } else if (dev->type && dev->type->pm) { |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 854 | info = "noirq type "; |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 855 | callback = pm_noirq_op(dev->type->pm, state); |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 856 | } else if (dev->class && dev->class->pm) { |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 857 | info = "noirq class "; |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 858 | callback = pm_noirq_op(dev->class->pm, state); |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 859 | } else if (dev->bus && dev->bus->pm) { |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 860 | info = "noirq bus "; |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 861 | callback = pm_noirq_op(dev->bus->pm, state); |
Rafael J. Wysocki | 7538e3d | 2011-02-16 21:53:17 +0100 | [diff] [blame] | 862 | } |
| 863 | |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 864 | if (!callback && dev->driver && dev->driver->pm) { |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 865 | info = "noirq driver "; |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 866 | callback = pm_noirq_op(dev->driver->pm, state); |
| 867 | } |
| 868 | |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 869 | return dpm_run_callback(callback, dev, state, info); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 870 | } |
| 871 | |
| 872 | /** |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 873 | * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices. |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 874 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 875 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 876 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
| 877 | * handlers for all non-sysdev devices. |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 878 | */ |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 879 | static int dpm_suspend_noirq(pm_message_t state) |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 880 | { |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 881 | ktime_t starttime = ktime_get(); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 882 | int error = 0; |
| 883 | |
Preeti U Murthy | 8651f97 | 2012-07-09 10:12:56 +0200 | [diff] [blame] | 884 | cpuidle_pause(); |
Rafael J. Wysocki | 2ed8d2b | 2009-03-16 22:34:06 +0100 | [diff] [blame] | 885 | suspend_device_irqs(); |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 886 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 887 | while (!list_empty(&dpm_late_early_list)) { |
| 888 | struct device *dev = to_device(dpm_late_early_list.prev); |
Rafael J. Wysocki | d08a5ac | 2010-11-11 01:50:53 +0100 | [diff] [blame] | 889 | |
| 890 | get_device(dev); |
| 891 | mutex_unlock(&dpm_list_mtx); |
| 892 | |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 893 | error = device_suspend_noirq(dev, state); |
Rafael J. Wysocki | d08a5ac | 2010-11-11 01:50:53 +0100 | [diff] [blame] | 894 | |
| 895 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 896 | if (error) { |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 897 | pm_dev_err(dev, state, " noirq", error); |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 898 | suspend_stats.failed_suspend_noirq++; |
| 899 | dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ); |
| 900 | dpm_save_failed_dev(dev_name(dev)); |
Rafael J. Wysocki | d08a5ac | 2010-11-11 01:50:53 +0100 | [diff] [blame] | 901 | put_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 902 | break; |
| 903 | } |
Rafael J. Wysocki | d08a5ac | 2010-11-11 01:50:53 +0100 | [diff] [blame] | 904 | if (!list_empty(&dev->power.entry)) |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 905 | list_move(&dev->power.entry, &dpm_noirq_list); |
Rafael J. Wysocki | d08a5ac | 2010-11-11 01:50:53 +0100 | [diff] [blame] | 906 | put_device(dev); |
Rafael J. Wysocki | 52d136c | 2012-04-29 22:52:19 +0200 | [diff] [blame] | 907 | |
| 908 | if (pm_wakeup_pending()) { |
| 909 | error = -EBUSY; |
| 910 | break; |
| 911 | } |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 912 | } |
Rafael J. Wysocki | 32bdfac | 2009-05-24 21:15:07 +0200 | [diff] [blame] | 913 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 914 | if (error) |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 915 | dpm_resume_noirq(resume_event(state)); |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 916 | else |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 917 | dpm_show_time(starttime, state, "noirq"); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 918 | return error; |
| 919 | } |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 920 | |
| 921 | /** |
| 922 | * device_suspend_late - Execute a "late suspend" callback for given device. |
| 923 | * @dev: Device to handle. |
| 924 | * @state: PM transition of the system being carried out. |
| 925 | * |
| 926 | * Runtime PM is disabled for @dev while this function is being executed. |
| 927 | */ |
| 928 | static int device_suspend_late(struct device *dev, pm_message_t state) |
| 929 | { |
| 930 | pm_callback_t callback = NULL; |
| 931 | char *info = NULL; |
| 932 | |
Rafael J. Wysocki | 9f6d8f6 | 2012-12-22 23:59:01 +0100 | [diff] [blame^] | 933 | __pm_runtime_disable(dev, false); |
| 934 | |
Rafael J. Wysocki | dbf3741 | 2012-08-06 01:46:39 +0200 | [diff] [blame] | 935 | if (dev->power.syscore) |
| 936 | return 0; |
| 937 | |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 938 | if (dev->pm_domain) { |
| 939 | info = "late power domain "; |
| 940 | callback = pm_late_early_op(&dev->pm_domain->ops, state); |
| 941 | } else if (dev->type && dev->type->pm) { |
| 942 | info = "late type "; |
| 943 | callback = pm_late_early_op(dev->type->pm, state); |
| 944 | } else if (dev->class && dev->class->pm) { |
| 945 | info = "late class "; |
| 946 | callback = pm_late_early_op(dev->class->pm, state); |
| 947 | } else if (dev->bus && dev->bus->pm) { |
| 948 | info = "late bus "; |
| 949 | callback = pm_late_early_op(dev->bus->pm, state); |
| 950 | } |
| 951 | |
| 952 | if (!callback && dev->driver && dev->driver->pm) { |
| 953 | info = "late driver "; |
| 954 | callback = pm_late_early_op(dev->driver->pm, state); |
| 955 | } |
| 956 | |
| 957 | return dpm_run_callback(callback, dev, state, info); |
| 958 | } |
| 959 | |
| 960 | /** |
| 961 | * dpm_suspend_late - Execute "late suspend" callbacks for all devices. |
| 962 | * @state: PM transition of the system being carried out. |
| 963 | */ |
| 964 | static int dpm_suspend_late(pm_message_t state) |
| 965 | { |
| 966 | ktime_t starttime = ktime_get(); |
| 967 | int error = 0; |
| 968 | |
| 969 | mutex_lock(&dpm_list_mtx); |
| 970 | while (!list_empty(&dpm_suspended_list)) { |
| 971 | struct device *dev = to_device(dpm_suspended_list.prev); |
| 972 | |
| 973 | get_device(dev); |
| 974 | mutex_unlock(&dpm_list_mtx); |
| 975 | |
| 976 | error = device_suspend_late(dev, state); |
| 977 | |
| 978 | mutex_lock(&dpm_list_mtx); |
| 979 | if (error) { |
| 980 | pm_dev_err(dev, state, " late", error); |
| 981 | suspend_stats.failed_suspend_late++; |
| 982 | dpm_save_failed_step(SUSPEND_SUSPEND_LATE); |
| 983 | dpm_save_failed_dev(dev_name(dev)); |
| 984 | put_device(dev); |
| 985 | break; |
| 986 | } |
| 987 | if (!list_empty(&dev->power.entry)) |
| 988 | list_move(&dev->power.entry, &dpm_late_early_list); |
| 989 | put_device(dev); |
Rafael J. Wysocki | 52d136c | 2012-04-29 22:52:19 +0200 | [diff] [blame] | 990 | |
| 991 | if (pm_wakeup_pending()) { |
| 992 | error = -EBUSY; |
| 993 | break; |
| 994 | } |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 995 | } |
| 996 | mutex_unlock(&dpm_list_mtx); |
| 997 | if (error) |
| 998 | dpm_resume_early(resume_event(state)); |
| 999 | else |
| 1000 | dpm_show_time(starttime, state, "late"); |
| 1001 | |
| 1002 | return error; |
| 1003 | } |
| 1004 | |
| 1005 | /** |
| 1006 | * dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks. |
| 1007 | * @state: PM transition of the system being carried out. |
| 1008 | */ |
| 1009 | int dpm_suspend_end(pm_message_t state) |
| 1010 | { |
| 1011 | int error = dpm_suspend_late(state); |
Colin Cross | 064b021 | 2012-07-19 10:38:06 +0200 | [diff] [blame] | 1012 | if (error) |
| 1013 | return error; |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 1014 | |
Colin Cross | 064b021 | 2012-07-19 10:38:06 +0200 | [diff] [blame] | 1015 | error = dpm_suspend_noirq(state); |
| 1016 | if (error) { |
Feng Hong | 997a031 | 2012-09-19 14:16:00 +0200 | [diff] [blame] | 1017 | dpm_resume_early(resume_event(state)); |
Colin Cross | 064b021 | 2012-07-19 10:38:06 +0200 | [diff] [blame] | 1018 | return error; |
| 1019 | } |
| 1020 | |
| 1021 | return 0; |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 1022 | } |
| 1023 | EXPORT_SYMBOL_GPL(dpm_suspend_end); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1024 | |
| 1025 | /** |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 1026 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. |
Randy Dunlap | 0a88422 | 2010-01-08 14:42:57 -0800 | [diff] [blame] | 1027 | * @dev: Device to suspend. |
| 1028 | * @state: PM transition of the system being carried out. |
| 1029 | * @cb: Suspend callback to execute. |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 1030 | */ |
| 1031 | static int legacy_suspend(struct device *dev, pm_message_t state, |
| 1032 | int (*cb)(struct device *dev, pm_message_t state)) |
| 1033 | { |
| 1034 | int error; |
| 1035 | ktime_t calltime; |
| 1036 | |
| 1037 | calltime = initcall_debug_start(dev); |
| 1038 | |
| 1039 | error = cb(dev, state); |
| 1040 | suspend_report_result(cb, error); |
| 1041 | |
| 1042 | initcall_debug_report(dev, calltime, error); |
| 1043 | |
| 1044 | return error; |
| 1045 | } |
| 1046 | |
| 1047 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 1048 | * device_suspend - Execute "suspend" callbacks for given device. |
| 1049 | * @dev: Device to handle. |
| 1050 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 1051 | * @async: If true, the device is being suspended asynchronously. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1052 | */ |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 1053 | 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] | 1054 | { |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 1055 | pm_callback_t callback = NULL; |
| 1056 | char *info = NULL; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1057 | int error = 0; |
| 1058 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 1059 | dpm_wait_for_children(dev, async); |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 1060 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 1061 | if (async_error) |
Mandeep Singh Baines | 1f758b2 | 2012-06-24 23:31:09 +0200 | [diff] [blame] | 1062 | goto Complete; |
Rafael J. Wysocki | 1e2ef05 | 2011-07-06 10:51:58 +0200 | [diff] [blame] | 1063 | |
Alan Stern | 88d2613 | 2012-09-19 21:59:02 +0200 | [diff] [blame] | 1064 | /* |
| 1065 | * If a device configured to wake up the system from sleep states |
| 1066 | * has been suspended at run time and there's a resume request pending |
| 1067 | * for it, this is equivalent to the device signaling wakeup, so the |
| 1068 | * system suspend operation should be aborted. |
| 1069 | */ |
Rafael J. Wysocki | 1e2ef05 | 2011-07-06 10:51:58 +0200 | [diff] [blame] | 1070 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
| 1071 | pm_wakeup_event(dev, 0); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 1072 | |
Rafael J. Wysocki | d83f905 | 2010-12-03 23:14:26 +0100 | [diff] [blame] | 1073 | if (pm_wakeup_pending()) { |
| 1074 | async_error = -EBUSY; |
Mandeep Singh Baines | 1f758b2 | 2012-06-24 23:31:09 +0200 | [diff] [blame] | 1075 | goto Complete; |
Rafael J. Wysocki | d83f905 | 2010-12-03 23:14:26 +0100 | [diff] [blame] | 1076 | } |
| 1077 | |
Rafael J. Wysocki | dbf3741 | 2012-08-06 01:46:39 +0200 | [diff] [blame] | 1078 | if (dev->power.syscore) |
| 1079 | goto Complete; |
| 1080 | |
Rafael J. Wysocki | 1e2ef05 | 2011-07-06 10:51:58 +0200 | [diff] [blame] | 1081 | device_lock(dev); |
| 1082 | |
Rafael J. Wysocki | 564b905 | 2011-06-23 01:52:55 +0200 | [diff] [blame] | 1083 | if (dev->pm_domain) { |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 1084 | info = "power domain "; |
| 1085 | callback = pm_op(&dev->pm_domain->ops, state); |
| 1086 | goto Run; |
Rafael J. Wysocki | 4d27e9d | 2011-04-29 00:35:50 +0200 | [diff] [blame] | 1087 | } |
| 1088 | |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 1089 | if (dev->type && dev->type->pm) { |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 1090 | info = "type "; |
| 1091 | callback = pm_op(dev->type->pm, state); |
| 1092 | goto Run; |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 1093 | } |
| 1094 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1095 | if (dev->class) { |
| 1096 | if (dev->class->pm) { |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 1097 | info = "class "; |
| 1098 | callback = pm_op(dev->class->pm, state); |
| 1099 | goto Run; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1100 | } else if (dev->class->suspend) { |
| 1101 | pm_dev_dbg(dev, state, "legacy class "); |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 1102 | error = legacy_suspend(dev, state, dev->class->suspend); |
Rafael J. Wysocki | 4d27e9d | 2011-04-29 00:35:50 +0200 | [diff] [blame] | 1103 | goto End; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1104 | } |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1105 | } |
| 1106 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1107 | if (dev->bus) { |
| 1108 | if (dev->bus->pm) { |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 1109 | info = "bus "; |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 1110 | callback = pm_op(dev->bus->pm, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1111 | } else if (dev->bus->suspend) { |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 1112 | pm_dev_dbg(dev, state, "legacy bus "); |
Rafael J. Wysocki | 875ab0b | 2009-12-18 01:57:31 +0100 | [diff] [blame] | 1113 | error = legacy_suspend(dev, state, dev->bus->suspend); |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 1114 | goto End; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1115 | } |
Rafael J. Wysocki | 7538e3d | 2011-02-16 21:53:17 +0100 | [diff] [blame] | 1116 | } |
| 1117 | |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 1118 | Run: |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 1119 | if (!callback && dev->driver && dev->driver->pm) { |
| 1120 | info = "driver "; |
| 1121 | callback = pm_op(dev->driver->pm, state); |
| 1122 | } |
| 1123 | |
Rafael J. Wysocki | 9cf519d | 2011-12-18 00:34:01 +0100 | [diff] [blame] | 1124 | error = dpm_run_callback(callback, dev, state, info); |
| 1125 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1126 | End: |
Rafael J. Wysocki | 4ca46ff | 2011-10-16 23:34:36 +0200 | [diff] [blame] | 1127 | if (!error) { |
| 1128 | dev->power.is_suspended = true; |
Rafael J. Wysocki | 8b258cc | 2011-11-17 21:39:33 +0100 | [diff] [blame] | 1129 | if (dev->power.wakeup_path |
| 1130 | && dev->parent && !dev->parent->power.ignore_children) |
Rafael J. Wysocki | 4ca46ff | 2011-10-16 23:34:36 +0200 | [diff] [blame] | 1131 | dev->parent->power.wakeup_path = true; |
| 1132 | } |
Alan Stern | 6d0e0e8 | 2011-06-18 22:42:09 +0200 | [diff] [blame] | 1133 | |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 1134 | device_unlock(dev); |
Mandeep Singh Baines | 1f758b2 | 2012-06-24 23:31:09 +0200 | [diff] [blame] | 1135 | |
| 1136 | Complete: |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 1137 | complete_all(&dev->power.completion); |
Alan Stern | 88d2613 | 2012-09-19 21:59:02 +0200 | [diff] [blame] | 1138 | if (error) |
Rafael J. Wysocki | 098dff7 | 2010-09-22 22:10:57 +0200 | [diff] [blame] | 1139 | async_error = error; |
| 1140 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1141 | return error; |
| 1142 | } |
| 1143 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 1144 | static void async_suspend(void *data, async_cookie_t cookie) |
| 1145 | { |
| 1146 | struct device *dev = (struct device *)data; |
| 1147 | int error; |
| 1148 | |
| 1149 | error = __device_suspend(dev, pm_transition, true); |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 1150 | if (error) { |
| 1151 | dpm_save_failed_dev(dev_name(dev)); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 1152 | pm_dev_err(dev, pm_transition, " async", error); |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 1153 | } |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 1154 | |
| 1155 | put_device(dev); |
| 1156 | } |
| 1157 | |
| 1158 | static int device_suspend(struct device *dev) |
| 1159 | { |
| 1160 | INIT_COMPLETION(dev->power.completion); |
| 1161 | |
Rafael J. Wysocki | 0e06b4a | 2010-01-23 22:25:15 +0100 | [diff] [blame] | 1162 | if (pm_async_enabled && dev->power.async_suspend) { |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 1163 | get_device(dev); |
| 1164 | async_schedule(async_suspend, dev); |
| 1165 | return 0; |
| 1166 | } |
| 1167 | |
| 1168 | return __device_suspend(dev, pm_transition, false); |
| 1169 | } |
| 1170 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1171 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 1172 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
| 1173 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1174 | */ |
Rafael J. Wysocki | 91e7c75 | 2011-05-17 23:26:00 +0200 | [diff] [blame] | 1175 | int dpm_suspend(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1176 | { |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 1177 | ktime_t starttime = ktime_get(); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1178 | int error = 0; |
| 1179 | |
Rafael J. Wysocki | 91e7c75 | 2011-05-17 23:26:00 +0200 | [diff] [blame] | 1180 | might_sleep(); |
| 1181 | |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1182 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 1183 | pm_transition = state; |
| 1184 | async_error = 0; |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 1185 | while (!list_empty(&dpm_prepared_list)) { |
| 1186 | struct device *dev = to_device(dpm_prepared_list.prev); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1187 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1188 | get_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1189 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1190 | |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 1191 | error = device_suspend(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1192 | |
Alan Stern | 1b3cbec | 2008-02-29 11:50:22 -0500 | [diff] [blame] | 1193 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1194 | if (error) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1195 | pm_dev_err(dev, state, "", error); |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 1196 | dpm_save_failed_dev(dev_name(dev)); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1197 | put_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1198 | break; |
| 1199 | } |
Rafael J. Wysocki | 7a8d37a | 2008-02-25 00:35:04 +0100 | [diff] [blame] | 1200 | if (!list_empty(&dev->power.entry)) |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 1201 | list_move(&dev->power.entry, &dpm_suspended_list); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1202 | put_device(dev); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 1203 | if (async_error) |
| 1204 | break; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1205 | } |
| 1206 | mutex_unlock(&dpm_list_mtx); |
Rafael J. Wysocki | 5af84b8 | 2010-01-23 22:23:32 +0100 | [diff] [blame] | 1207 | async_synchronize_full(); |
| 1208 | if (!error) |
| 1209 | error = async_error; |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 1210 | if (error) { |
| 1211 | suspend_stats.failed_suspend++; |
| 1212 | dpm_save_failed_step(SUSPEND_SUSPEND); |
| 1213 | } else |
Rafael J. Wysocki | ecf762b | 2009-12-18 01:57:47 +0100 | [diff] [blame] | 1214 | dpm_show_time(starttime, state, NULL); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1215 | return error; |
| 1216 | } |
| 1217 | |
| 1218 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 1219 | * device_prepare - Prepare a device for system power transition. |
| 1220 | * @dev: Device to handle. |
| 1221 | * @state: PM transition of the system being carried out. |
| 1222 | * |
| 1223 | * Execute the ->prepare() callback(s) for given device. No new children of the |
| 1224 | * device may be registered after this function has returned. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1225 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 1226 | static int device_prepare(struct device *dev, pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1227 | { |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 1228 | int (*callback)(struct device *) = NULL; |
| 1229 | char *info = NULL; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1230 | int error = 0; |
| 1231 | |
Rafael J. Wysocki | dbf3741 | 2012-08-06 01:46:39 +0200 | [diff] [blame] | 1232 | if (dev->power.syscore) |
| 1233 | return 0; |
| 1234 | |
Alan Stern | 88d2613 | 2012-09-19 21:59:02 +0200 | [diff] [blame] | 1235 | /* |
| 1236 | * If a device's parent goes into runtime suspend at the wrong time, |
| 1237 | * it won't be possible to resume the device. To prevent this we |
| 1238 | * block runtime suspend here, during the prepare phase, and allow |
| 1239 | * it again during the complete phase. |
| 1240 | */ |
| 1241 | pm_runtime_get_noresume(dev); |
| 1242 | |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 1243 | device_lock(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1244 | |
Rafael J. Wysocki | 4ca46ff | 2011-10-16 23:34:36 +0200 | [diff] [blame] | 1245 | dev->power.wakeup_path = device_may_wakeup(dev); |
| 1246 | |
Rafael J. Wysocki | 564b905 | 2011-06-23 01:52:55 +0200 | [diff] [blame] | 1247 | if (dev->pm_domain) { |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 1248 | info = "preparing power domain "; |
| 1249 | callback = dev->pm_domain->ops.prepare; |
Rafael J. Wysocki | 4d27e9d | 2011-04-29 00:35:50 +0200 | [diff] [blame] | 1250 | } else if (dev->type && dev->type->pm) { |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 1251 | info = "preparing type "; |
| 1252 | callback = dev->type->pm->prepare; |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 1253 | } else if (dev->class && dev->class->pm) { |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 1254 | info = "preparing class "; |
| 1255 | callback = dev->class->pm->prepare; |
Rafael J. Wysocki | 9659cc0 | 2011-02-18 23:20:21 +0100 | [diff] [blame] | 1256 | } else if (dev->bus && dev->bus->pm) { |
Rafael J. Wysocki | 35cd133 | 2011-12-18 00:34:13 +0100 | [diff] [blame] | 1257 | info = "preparing bus "; |
| 1258 | callback = dev->bus->pm->prepare; |
| 1259 | } |
| 1260 | |
| 1261 | if (!callback && dev->driver && dev->driver->pm) { |
| 1262 | info = "preparing driver "; |
| 1263 | callback = dev->driver->pm->prepare; |
| 1264 | } |
| 1265 | |
| 1266 | if (callback) { |
| 1267 | error = callback(dev); |
| 1268 | suspend_report_result(callback, error); |
Rafael J. Wysocki | 7538e3d | 2011-02-16 21:53:17 +0100 | [diff] [blame] | 1269 | } |
| 1270 | |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 1271 | device_unlock(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1272 | |
| 1273 | return error; |
| 1274 | } |
| 1275 | |
| 1276 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 1277 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
| 1278 | * @state: PM transition of the system being carried out. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1279 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 1280 | * Execute the ->prepare() callback(s) for all devices. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1281 | */ |
Rafael J. Wysocki | 91e7c75 | 2011-05-17 23:26:00 +0200 | [diff] [blame] | 1282 | int dpm_prepare(pm_message_t state) |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1283 | { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1284 | int error = 0; |
| 1285 | |
Rafael J. Wysocki | 91e7c75 | 2011-05-17 23:26:00 +0200 | [diff] [blame] | 1286 | might_sleep(); |
| 1287 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1288 | mutex_lock(&dpm_list_mtx); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1289 | while (!list_empty(&dpm_list)) { |
| 1290 | struct device *dev = to_device(dpm_list.next); |
| 1291 | |
| 1292 | get_device(dev); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1293 | mutex_unlock(&dpm_list_mtx); |
| 1294 | |
Rafael J. Wysocki | 1e2ef05 | 2011-07-06 10:51:58 +0200 | [diff] [blame] | 1295 | error = device_prepare(dev, state); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1296 | |
| 1297 | mutex_lock(&dpm_list_mtx); |
| 1298 | if (error) { |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1299 | if (error == -EAGAIN) { |
| 1300 | put_device(dev); |
Sebastian Ott | 886a7a3 | 2009-07-08 13:26:05 +0200 | [diff] [blame] | 1301 | error = 0; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1302 | continue; |
| 1303 | } |
Rafael J. Wysocki | 1e75227 | 2010-12-03 22:58:05 +0100 | [diff] [blame] | 1304 | printk(KERN_INFO "PM: Device %s not prepared " |
| 1305 | "for power transition: code %d\n", |
Rafael J. Wysocki | 5c1a07a | 2010-12-24 15:03:34 +0100 | [diff] [blame] | 1306 | dev_name(dev), error); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1307 | put_device(dev); |
| 1308 | break; |
| 1309 | } |
Alan Stern | f76b168b | 2011-06-18 20:22:23 +0200 | [diff] [blame] | 1310 | dev->power.is_prepared = true; |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1311 | if (!list_empty(&dev->power.entry)) |
Rafael J. Wysocki | 8a43a9a | 2010-12-16 00:50:30 +0100 | [diff] [blame] | 1312 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1313 | put_device(dev); |
| 1314 | } |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1315 | mutex_unlock(&dpm_list_mtx); |
| 1316 | return error; |
| 1317 | } |
| 1318 | |
| 1319 | /** |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 1320 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
| 1321 | * @state: PM transition of the system being carried out. |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1322 | * |
Rafael J. Wysocki | 20d652d | 2009-08-20 20:25:52 +0200 | [diff] [blame] | 1323 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
| 1324 | * callbacks for them. |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1325 | */ |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 1326 | int dpm_suspend_start(pm_message_t state) |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1327 | { |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1328 | int error; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1329 | |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1330 | error = dpm_prepare(state); |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 1331 | if (error) { |
| 1332 | suspend_stats.failed_prepare++; |
| 1333 | dpm_save_failed_step(SUSPEND_PREPARE); |
| 1334 | } else |
Rafael J. Wysocki | 1eede07 | 2008-05-20 23:00:01 +0200 | [diff] [blame] | 1335 | error = dpm_suspend(state); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1336 | return error; |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1337 | } |
Alan Stern | d161630 | 2009-05-24 22:05:42 +0200 | [diff] [blame] | 1338 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1339 | |
| 1340 | void __suspend_report_result(const char *function, void *fn, int ret) |
| 1341 | { |
Bjorn Helgaas | c80cfb0 | 2008-10-15 22:01:35 -0700 | [diff] [blame] | 1342 | if (ret) |
| 1343 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); |
Alan Stern | cd59abf | 2007-09-21 15:36:56 -0400 | [diff] [blame] | 1344 | } |
| 1345 | EXPORT_SYMBOL_GPL(__suspend_report_result); |
Rafael J. Wysocki | f8824ce | 2010-01-27 23:47:38 +0100 | [diff] [blame] | 1346 | |
| 1347 | /** |
| 1348 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. |
| 1349 | * @dev: Device to wait for. |
| 1350 | * @subordinate: Device that needs to wait for @dev. |
| 1351 | */ |
Rafael J. Wysocki | 098dff7 | 2010-09-22 22:10:57 +0200 | [diff] [blame] | 1352 | 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] | 1353 | { |
| 1354 | dpm_wait(dev, subordinate->power.async_suspend); |
Rafael J. Wysocki | 098dff7 | 2010-09-22 22:10:57 +0200 | [diff] [blame] | 1355 | return async_error; |
Rafael J. Wysocki | f8824ce | 2010-01-27 23:47:38 +0100 | [diff] [blame] | 1356 | } |
| 1357 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); |
Ming Lei | dfe3212 | 2012-08-17 22:06:59 +0800 | [diff] [blame] | 1358 | |
| 1359 | /** |
| 1360 | * dpm_for_each_dev - device iterator. |
| 1361 | * @data: data for the callback. |
| 1362 | * @fn: function to be called for each device. |
| 1363 | * |
| 1364 | * Iterate over devices in dpm_list, and call @fn for each device, |
| 1365 | * passing it @data. |
| 1366 | */ |
| 1367 | void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *)) |
| 1368 | { |
| 1369 | struct device *dev; |
| 1370 | |
| 1371 | if (!fn) |
| 1372 | return; |
| 1373 | |
| 1374 | device_pm_lock(); |
| 1375 | list_for_each_entry(dev, &dpm_list, power.entry) |
| 1376 | fn(dev, data); |
| 1377 | device_pm_unlock(); |
| 1378 | } |
| 1379 | EXPORT_SYMBOL_GPL(dpm_for_each_dev); |