drivers/base/power/generic_ops.c

   1 /*
   2  * drivers/base/power/generic_ops.c - Generic PM callbacks for subsystems
   3  *
   4  * Copyright (c) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
   5  *
   6  * This file is released under the GPLv2.
   7  */
   8
   9 #include <linux/pm.h>
  10 #include <linux/pm_runtime.h>
  11 #include <linux/export.h>
  12
  13 #ifdef CONFIG_PM
  14 /**
  15  * pm_generic_runtime_suspend - Generic runtime suspend callback for subsystems.
  16  * @dev: Device to suspend.
  17  *
  18  * If PM operations are defined for the @dev's driver and they include
  19  * ->runtime_suspend(), execute it and return its error code.  Otherwise,
  20  * return 0.
  21  */
  22 int pm_generic_runtime_suspend(struct device *dev)
  23 {
  24         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
  25         int ret;
  26
  27         ret = pm && pm->runtime_suspend ? pm->runtime_suspend(dev) : 0;
  28
  29         return ret;
  30 }
  31 EXPORT_SYMBOL_GPL(pm_generic_runtime_suspend);
  32
  33 /**
  34  * pm_generic_runtime_resume - Generic runtime resume callback for subsystems.
  35  * @dev: Device to resume.
  36  *
  37  * If PM operations are defined for the @dev's driver and they include
  38  * ->runtime_resume(), execute it and return its error code.  Otherwise,
  39  * return 0.
  40  */
  41 int pm_generic_runtime_resume(struct device *dev)
  42 {
  43         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
  44         int ret;
  45
  46         ret = pm && pm->runtime_resume ? pm->runtime_resume(dev) : 0;
  47
  48         return ret;
  49 }
  50 EXPORT_SYMBOL_GPL(pm_generic_runtime_resume);
  51 #endif /* CONFIG_PM */
  52
  53 #ifdef CONFIG_PM_SLEEP
  54 /**
  55  * pm_generic_prepare - Generic routine preparing a device for power transition.
  56  * @dev: Device to prepare.
  57  *
  58  * Prepare a device for a system-wide power transition.
  59  */
  60 int pm_generic_prepare(struct device *dev)
  61 {
  62         struct device_driver *drv = dev->driver;
  63         int ret = 0;
  64
  65         if (drv && drv->pm && drv->pm->prepare)
  66                 ret = drv->pm->prepare(dev);
  67
  68         return ret;
  69 }
  70
  71 /**
  72  * pm_generic_suspend_noirq - Generic suspend_noirq callback for subsystems.
  73  * @dev: Device to suspend.
  74  */
  75 int pm_generic_suspend_noirq(struct device *dev)
  76 {
  77         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
  78
  79         return pm && pm->suspend_noirq ? pm->suspend_noirq(dev) : 0;
  80 }
  81 EXPORT_SYMBOL_GPL(pm_generic_suspend_noirq);
  82
  83 /**
  84  * pm_generic_suspend_late - Generic suspend_late callback for subsystems.
  85  * @dev: Device to suspend.
  86  */
  87 int pm_generic_suspend_late(struct device *dev)
  88 {
  89         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
  90
  91         return pm && pm->suspend_late ? pm->suspend_late(dev) : 0;
  92 }
  93 EXPORT_SYMBOL_GPL(pm_generic_suspend_late);
  94
  95 /**
  96  * pm_generic_suspend - Generic suspend callback for subsystems.
  97  * @dev: Device to suspend.
  98  */
  99 int pm_generic_suspend(struct device *dev)
 100 {
 101         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 102
 103         return pm && pm->suspend ? pm->suspend(dev) : 0;
 104 }
 105 EXPORT_SYMBOL_GPL(pm_generic_suspend);
 106
 107 /**
 108  * pm_generic_freeze_noirq - Generic freeze_noirq callback for subsystems.
 109  * @dev: Device to freeze.
 110  */
 111 int pm_generic_freeze_noirq(struct device *dev)
 112 {
 113         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 114
 115         return pm && pm->freeze_noirq ? pm->freeze_noirq(dev) : 0;
 116 }
 117 EXPORT_SYMBOL_GPL(pm_generic_freeze_noirq);
 118
 119 /**
 120  * pm_generic_freeze_late - Generic freeze_late callback for subsystems.
 121  * @dev: Device to freeze.
 122  */
 123 int pm_generic_freeze_late(struct device *dev)
 124 {
 125         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 126
 127         return pm && pm->freeze_late ? pm->freeze_late(dev) : 0;
 128 }
 129 EXPORT_SYMBOL_GPL(pm_generic_freeze_late);
 130
 131 /**
 132  * pm_generic_freeze - Generic freeze callback for subsystems.
 133  * @dev: Device to freeze.
 134  */
 135 int pm_generic_freeze(struct device *dev)
 136 {
 137         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 138
 139         return pm && pm->freeze ? pm->freeze(dev) : 0;
 140 }
 141 EXPORT_SYMBOL_GPL(pm_generic_freeze);
 142
 143 /**
 144  * pm_generic_poweroff_noirq - Generic poweroff_noirq callback for subsystems.
 145  * @dev: Device to handle.
 146  */
 147 int pm_generic_poweroff_noirq(struct device *dev)
 148 {
 149         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 150
 151         return pm && pm->poweroff_noirq ? pm->poweroff_noirq(dev) : 0;
 152 }
 153 EXPORT_SYMBOL_GPL(pm_generic_poweroff_noirq);
 154
 155 /**
 156  * pm_generic_poweroff_late - Generic poweroff_late callback for subsystems.
 157  * @dev: Device to handle.
 158  */
 159 int pm_generic_poweroff_late(struct device *dev)
 160 {
 161         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 162
 163         return pm && pm->poweroff_late ? pm->poweroff_late(dev) : 0;
 164 }
 165 EXPORT_SYMBOL_GPL(pm_generic_poweroff_late);
 166
 167 /**
 168  * pm_generic_poweroff - Generic poweroff callback for subsystems.
 169  * @dev: Device to handle.
 170  */
 171 int pm_generic_poweroff(struct device *dev)
 172 {
 173         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 174
 175         return pm && pm->poweroff ? pm->poweroff(dev) : 0;
 176 }
 177 EXPORT_SYMBOL_GPL(pm_generic_poweroff);
 178
 179 /**
 180  * pm_generic_thaw_noirq - Generic thaw_noirq callback for subsystems.
 181  * @dev: Device to thaw.
 182  */
 183 int pm_generic_thaw_noirq(struct device *dev)
 184 {
 185         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 186
 187         return pm && pm->thaw_noirq ? pm->thaw_noirq(dev) : 0;
 188 }
 189 EXPORT_SYMBOL_GPL(pm_generic_thaw_noirq);
 190
 191 /**
 192  * pm_generic_thaw_early - Generic thaw_early callback for subsystems.
 193  * @dev: Device to thaw.
 194  */
 195 int pm_generic_thaw_early(struct device *dev)
 196 {
 197         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 198
 199         return pm && pm->thaw_early ? pm->thaw_early(dev) : 0;
 200 }
 201 EXPORT_SYMBOL_GPL(pm_generic_thaw_early);
 202
 203 /**
 204  * pm_generic_thaw - Generic thaw callback for subsystems.
 205  * @dev: Device to thaw.
 206  */
 207 int pm_generic_thaw(struct device *dev)
 208 {
 209         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 210
 211         return pm && pm->thaw ? pm->thaw(dev) : 0;
 212 }
 213 EXPORT_SYMBOL_GPL(pm_generic_thaw);
 214
 215 /**
 216  * pm_generic_resume_noirq - Generic resume_noirq callback for subsystems.
 217  * @dev: Device to resume.
 218  */
 219 int pm_generic_resume_noirq(struct device *dev)
 220 {
 221         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 222
 223         return pm && pm->resume_noirq ? pm->resume_noirq(dev) : 0;
 224 }
 225 EXPORT_SYMBOL_GPL(pm_generic_resume_noirq);
 226
 227 /**
 228  * pm_generic_resume_early - Generic resume_early callback for subsystems.
 229  * @dev: Device to resume.
 230  */
 231 int pm_generic_resume_early(struct device *dev)
 232 {
 233         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 234
 235         return pm && pm->resume_early ? pm->resume_early(dev) : 0;
 236 }
 237 EXPORT_SYMBOL_GPL(pm_generic_resume_early);
 238
 239 /**
 240  * pm_generic_resume - Generic resume callback for subsystems.
 241  * @dev: Device to resume.
 242  */
 243 int pm_generic_resume(struct device *dev)
 244 {
 245         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 246
 247         return pm && pm->resume ? pm->resume(dev) : 0;
 248 }
 249 EXPORT_SYMBOL_GPL(pm_generic_resume);
 250
 251 /**
 252  * pm_generic_restore_noirq - Generic restore_noirq callback for subsystems.
 253  * @dev: Device to restore.
 254  */
 255 int pm_generic_restore_noirq(struct device *dev)
 256 {
 257         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 258
 259         return pm && pm->restore_noirq ? pm->restore_noirq(dev) : 0;
 260 }
 261 EXPORT_SYMBOL_GPL(pm_generic_restore_noirq);
 262
 263 /**
 264  * pm_generic_restore_early - Generic restore_early callback for subsystems.
 265  * @dev: Device to resume.
 266  */
 267 int pm_generic_restore_early(struct device *dev)
 268 {
 269         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 270
 271         return pm && pm->restore_early ? pm->restore_early(dev) : 0;
 272 }
 273 EXPORT_SYMBOL_GPL(pm_generic_restore_early);
 274
 275 /**
 276  * pm_generic_restore - Generic restore callback for subsystems.
 277  * @dev: Device to restore.
 278  */
 279 int pm_generic_restore(struct device *dev)
 280 {
 281         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 282
 283         return pm && pm->restore ? pm->restore(dev) : 0;
 284 }
 285 EXPORT_SYMBOL_GPL(pm_generic_restore);
 286
 287 /**
 288  * pm_generic_complete - Generic routine completing a device power transition.
 289  * @dev: Device to handle.
 290  *
 291  * Complete a device power transition during a system-wide power transition.
 292  */
 293 void pm_generic_complete(struct device *dev)
 294 {
 295         struct device_driver *drv = dev->driver;
 296
 297         if (drv && drv->pm && drv->pm->complete)
 298                 drv->pm->complete(dev);
 299
 300         /*
 301          * Let runtime PM try to suspend devices that haven't been in use before
 302          * going into the system-wide sleep state we're resuming from.
 303          */
 304         pm_request_idle(dev);
 305 }
 306 #endif /* CONFIG_PM_SLEEP */