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 int of_platform_device_suspend(struct device *dev, pm_message_t state)
  69 {
  70         struct of_device *of_dev = to_of_device(dev);
  71         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
  72         int error = 0;
  73
  74         if (dev->driver && drv->suspend)
  75                 error = drv->suspend(of_dev, state);
  76         return error;
  77 }
  78
  79 static int of_platform_device_resume(struct device * dev)
  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 error = 0;
  84
  85         if (dev->driver && drv->resume)
  86                 error = drv->resume(of_dev);
  87         return error;
  88 }
  89
  90 static void of_platform_device_shutdown(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
  95         if (dev->driver && drv->shutdown)
  96                 drv->shutdown(of_dev);
  97 }
  98
  99 int of_bus_type_init(struct bus_type *bus, const char *name)
 100 {
 101         bus->name = name;
 102         bus->match = of_platform_bus_match;
 103         bus->probe = of_platform_device_probe;
 104         bus->remove = of_platform_device_remove;
 105         bus->suspend = of_platform_device_suspend;
 106         bus->resume = of_platform_device_resume;
 107         bus->shutdown = of_platform_device_shutdown;
 108         bus->dev_attrs = of_platform_device_attrs;
 109         return bus_register(bus);
 110 }
 111
 112 int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
 113 {
 114         /* initialize common driver fields */
 115         if (!drv->driver.name)
 116                 drv->driver.name = drv->name;
 117         if (!drv->driver.owner)
 118                 drv->driver.owner = drv->owner;
 119         drv->driver.bus = bus;
 120
 121         /* register with core */
 122         return driver_register(&drv->driver);
 123 }
 124 EXPORT_SYMBOL(of_register_driver);
 125
 126 void of_unregister_driver(struct of_platform_driver *drv)
 127 {
 128         driver_unregister(&drv->driver);
 129 }
 130 EXPORT_SYMBOL(of_unregister_driver);