drivers/of/platform.c

   1 /*
   2  *    Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
   3  *                       <benh@kernel.crashing.org>
   4  *    and                Arnd Bergmann, IBM Corp.
   5  *    Merged from powerpc/kernel/of_platform.c and
   6  *    sparc{,64}/kernel/of_device.c by Stephen Rothwell
   7  *
   8  *  This program is free software; you can redistribute it and/or
   9  *  modify it under the terms of the GNU General Public License
  10  *  as published by the Free Software Foundation; either version
  11  *  2 of the License, or (at your option) any later version.
  12  *
  13  */
  14 #include <linux/errno.h>
  15 #include <linux/module.h>
  16 #include <linux/device.h>
  17 #include <linux/of_device.h>
  18 #include <linux/of_platform.h>
  19
  20 extern struct device_attribute of_platform_device_attrs[];
  21
  22 static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
  23 {
  24         struct of_device *of_dev = to_of_device(dev);
  25         struct of_platform_driver *of_drv = to_of_platform_driver(drv);
  26         const struct of_device_id *matches = of_drv->match_table;
  27
  28         if (!matches)
  29                 return 0;
  30
  31         return of_match_device(matches, of_dev) != NULL;
  32 }
  33
  34 static int of_platform_device_probe(struct device *dev)
  35 {
  36         int error = -ENODEV;
  37         struct of_platform_driver *drv;
  38         struct of_device *of_dev;
  39         const struct of_device_id *match;
  40
  41         drv = to_of_platform_driver(dev->driver);
  42         of_dev = to_of_device(dev);
  43
  44         if (!drv->probe)
  45                 return error;
  46
  47         of_dev_get(of_dev);
  48
  49         match = of_match_device(drv->match_table, of_dev);
  50         if (match)
  51                 error = drv->probe(of_dev, match);
  52         if (error)
  53                 of_dev_put(of_dev);
  54
  55         return error;
  56 }
  57
  58 static int of_platform_device_remove(struct device *dev)
  59 {
  60         struct of_device *of_dev = to_of_device(dev);
  61         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
  62
  63         if (dev->driver && drv->remove)
  64                 drv->remove(of_dev);
  65         return 0;
  66 }
  67
  68 static void of_platform_device_shutdown(struct device *dev)
  69 {
  70         struct of_device *of_dev = to_of_device(dev);
  71         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
  72
  73         if (dev->driver && drv->shutdown)
  74                 drv->shutdown(of_dev);
  75 }
  76
  77 #ifdef CONFIG_PM_SLEEP
  78
  79 static int of_platform_legacy_suspend(struct device *dev, pm_message_t mesg)
  80 {
  81         struct of_device *of_dev = to_of_device(dev);
  82         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
  83         int ret = 0;
  84
  85         if (dev->driver && drv->suspend)
  86                 ret = drv->suspend(of_dev, mesg);
  87         return ret;
  88 }
  89
  90 static int of_platform_legacy_resume(struct device *dev)
  91 {
  92         struct of_device *of_dev = to_of_device(dev);
  93         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
  94         int ret = 0;
  95
  96         if (dev->driver && drv->resume)
  97                 ret = drv->resume(of_dev);
  98         return ret;
  99 }
 100
 101 static int of_platform_pm_prepare(struct device *dev)
 102 {
 103         struct device_driver *drv = dev->driver;
 104         int ret = 0;
 105
 106         if (drv && drv->pm && drv->pm->prepare)
 107                 ret = drv->pm->prepare(dev);
 108
 109         return ret;
 110 }
 111
 112 static void of_platform_pm_complete(struct device *dev)
 113 {
 114         struct device_driver *drv = dev->driver;
 115
 116         if (drv && drv->pm && drv->pm->complete)
 117                 drv->pm->complete(dev);
 118 }
 119
 120 #ifdef CONFIG_SUSPEND
 121
 122 static int of_platform_pm_suspend(struct device *dev)
 123 {
 124         struct device_driver *drv = dev->driver;
 125         int ret = 0;
 126
 127         if (!drv)
 128                 return 0;
 129
 130         if (drv->pm) {
 131                 if (drv->pm->suspend)
 132                         ret = drv->pm->suspend(dev);
 133         } else {
 134                 ret = of_platform_legacy_suspend(dev, PMSG_SUSPEND);
 135         }
 136
 137         return ret;
 138 }
 139
 140 static int of_platform_pm_suspend_noirq(struct device *dev)
 141 {
 142         struct device_driver *drv = dev->driver;
 143         int ret = 0;
 144
 145         if (!drv)
 146                 return 0;
 147
 148         if (drv->pm) {
 149                 if (drv->pm->suspend_noirq)
 150                         ret = drv->pm->suspend_noirq(dev);
 151         }
 152
 153         return ret;
 154 }
 155
 156 static int of_platform_pm_resume(struct device *dev)
 157 {
 158         struct device_driver *drv = dev->driver;
 159         int ret = 0;
 160
 161         if (!drv)
 162                 return 0;
 163
 164         if (drv->pm) {
 165                 if (drv->pm->resume)
 166                         ret = drv->pm->resume(dev);
 167         } else {
 168                 ret = of_platform_legacy_resume(dev);
 169         }
 170
 171         return ret;
 172 }
 173
 174 static int of_platform_pm_resume_noirq(struct device *dev)
 175 {
 176         struct device_driver *drv = dev->driver;
 177         int ret = 0;
 178
 179         if (!drv)
 180                 return 0;
 181
 182         if (drv->pm) {
 183                 if (drv->pm->resume_noirq)
 184                         ret = drv->pm->resume_noirq(dev);
 185         }
 186
 187         return ret;
 188 }
 189
 190 #else /* !CONFIG_SUSPEND */
 191
 192 #define of_platform_pm_suspend          NULL
 193 #define of_platform_pm_resume           NULL
 194 #define of_platform_pm_suspend_noirq    NULL
 195 #define of_platform_pm_resume_noirq     NULL
 196
 197 #endif /* !CONFIG_SUSPEND */
 198
 199 #ifdef CONFIG_HIBERNATION
 200
 201 static int of_platform_pm_freeze(struct device *dev)
 202 {
 203         struct device_driver *drv = dev->driver;
 204         int ret = 0;
 205
 206         if (!drv)
 207                 return 0;
 208
 209         if (drv->pm) {
 210                 if (drv->pm->freeze)
 211                         ret = drv->pm->freeze(dev);
 212         } else {
 213                 ret = of_platform_legacy_suspend(dev, PMSG_FREEZE);
 214         }
 215
 216         return ret;
 217 }
 218
 219 static int of_platform_pm_freeze_noirq(struct device *dev)
 220 {
 221         struct device_driver *drv = dev->driver;
 222         int ret = 0;
 223
 224         if (!drv)
 225                 return 0;
 226
 227         if (drv->pm) {
 228                 if (drv->pm->freeze_noirq)
 229                         ret = drv->pm->freeze_noirq(dev);
 230         }
 231
 232         return ret;
 233 }
 234
 235 static int of_platform_pm_thaw(struct device *dev)
 236 {
 237         struct device_driver *drv = dev->driver;
 238         int ret = 0;
 239
 240         if (!drv)
 241                 return 0;
 242
 243         if (drv->pm) {
 244                 if (drv->pm->thaw)
 245                         ret = drv->pm->thaw(dev);
 246         } else {
 247                 ret = of_platform_legacy_resume(dev);
 248         }
 249
 250         return ret;
 251 }
 252
 253 static int of_platform_pm_thaw_noirq(struct device *dev)
 254 {
 255         struct device_driver *drv = dev->driver;
 256         int ret = 0;
 257
 258         if (!drv)
 259                 return 0;
 260
 261         if (drv->pm) {
 262                 if (drv->pm->thaw_noirq)
 263                         ret = drv->pm->thaw_noirq(dev);
 264         }
 265
 266         return ret;
 267 }
 268
 269 static int of_platform_pm_poweroff(struct device *dev)
 270 {
 271         struct device_driver *drv = dev->driver;
 272         int ret = 0;
 273
 274         if (!drv)
 275                 return 0;
 276
 277         if (drv->pm) {
 278                 if (drv->pm->poweroff)
 279                         ret = drv->pm->poweroff(dev);
 280         } else {
 281                 ret = of_platform_legacy_suspend(dev, PMSG_HIBERNATE);
 282         }
 283
 284         return ret;
 285 }
 286
 287 static int of_platform_pm_poweroff_noirq(struct device *dev)
 288 {
 289         struct device_driver *drv = dev->driver;
 290         int ret = 0;
 291
 292         if (!drv)
 293                 return 0;
 294
 295         if (drv->pm) {
 296                 if (drv->pm->poweroff_noirq)
 297                         ret = drv->pm->poweroff_noirq(dev);
 298         }
 299
 300         return ret;
 301 }
 302
 303 static int of_platform_pm_restore(struct device *dev)
 304 {
 305         struct device_driver *drv = dev->driver;
 306         int ret = 0;
 307
 308         if (!drv)
 309                 return 0;
 310
 311         if (drv->pm) {
 312                 if (drv->pm->restore)
 313                         ret = drv->pm->restore(dev);
 314         } else {
 315                 ret = of_platform_legacy_resume(dev);
 316         }
 317
 318         return ret;
 319 }
 320
 321 static int of_platform_pm_restore_noirq(struct device *dev)
 322 {
 323         struct device_driver *drv = dev->driver;
 324         int ret = 0;
 325
 326         if (!drv)
 327                 return 0;
 328
 329         if (drv->pm) {
 330                 if (drv->pm->restore_noirq)
 331                         ret = drv->pm->restore_noirq(dev);
 332         }
 333
 334         return ret;
 335 }
 336
 337 #else /* !CONFIG_HIBERNATION */
 338
 339 #define of_platform_pm_freeze           NULL
 340 #define of_platform_pm_thaw             NULL
 341 #define of_platform_pm_poweroff         NULL
 342 #define of_platform_pm_restore          NULL
 343 #define of_platform_pm_freeze_noirq     NULL
 344 #define of_platform_pm_thaw_noirq               NULL
 345 #define of_platform_pm_poweroff_noirq   NULL
 346 #define of_platform_pm_restore_noirq    NULL
 347
 348 #endif /* !CONFIG_HIBERNATION */
 349
 350 static struct dev_pm_ops of_platform_dev_pm_ops = {
 351         .prepare = of_platform_pm_prepare,
 352         .complete = of_platform_pm_complete,
 353         .suspend = of_platform_pm_suspend,
 354         .resume = of_platform_pm_resume,
 355         .freeze = of_platform_pm_freeze,
 356         .thaw = of_platform_pm_thaw,
 357         .poweroff = of_platform_pm_poweroff,
 358         .restore = of_platform_pm_restore,
 359         .suspend_noirq = of_platform_pm_suspend_noirq,
 360         .resume_noirq = of_platform_pm_resume_noirq,
 361         .freeze_noirq = of_platform_pm_freeze_noirq,
 362         .thaw_noirq = of_platform_pm_thaw_noirq,
 363         .poweroff_noirq = of_platform_pm_poweroff_noirq,
 364         .restore_noirq = of_platform_pm_restore_noirq,
 365 };
 366
 367 #define OF_PLATFORM_PM_OPS_PTR  (&of_platform_dev_pm_ops)
 368
 369 #else /* !CONFIG_PM_SLEEP */
 370
 371 #define OF_PLATFORM_PM_OPS_PTR  NULL
 372
 373 #endif /* !CONFIG_PM_SLEEP */
 374
 375 int of_bus_type_init(struct bus_type *bus, const char *name)
 376 {
 377         bus->name = name;
 378         bus->match = of_platform_bus_match;
 379         bus->probe = of_platform_device_probe;
 380         bus->remove = of_platform_device_remove;
 381         bus->shutdown = of_platform_device_shutdown;
 382         bus->dev_attrs = of_platform_device_attrs;
 383         bus->pm = OF_PLATFORM_PM_OPS_PTR;
 384         return bus_register(bus);
 385 }
 386
 387 int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
 388 {
 389         /* initialize common driver fields */
 390         if (!drv->driver.name)
 391                 drv->driver.name = drv->name;
 392         if (!drv->driver.owner)
 393                 drv->driver.owner = drv->owner;
 394         drv->driver.bus = bus;
 395
 396         /* register with core */
 397         return driver_register(&drv->driver);
 398 }
 399 EXPORT_SYMBOL(of_register_driver);
 400
 401 void of_unregister_driver(struct of_platform_driver *drv)
 402 {
 403         driver_unregister(&drv->driver);
 404 }
 405 EXPORT_SYMBOL(of_unregister_driver);