arch/powerpc/kernel/of_device.c

   1 #include <linux/string.h>
   2 #include <linux/kernel.h>
   3 #include <linux/init.h>
   4 #include <linux/module.h>
   5 #include <linux/mod_devicetable.h>
   6 #include <linux/slab.h>
   7
   8 #include <asm/errno.h>
   9 #include <asm/of_device.h>
  10
  11 /**
  12  * of_match_device - Tell if an of_device structure has a matching
  13  * of_match structure
  14  * @ids: array of of device match structures to search in
  15  * @dev: the of device structure to match against
  16  *
  17  * Used by a driver to check whether an of_device present in the
  18  * system is in its list of supported devices.
  19  */
  20 const struct of_device_id *of_match_device(const struct of_device_id *matches,
  21                                         const struct of_device *dev)
  22 {
  23         if (!dev->node)
  24                 return NULL;
  25         while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
  26                 int match = 1;
  27                 if (matches->name[0])
  28                         match &= dev->node->name
  29                                 && !strcmp(matches->name, dev->node->name);
  30                 if (matches->type[0])
  31                         match &= dev->node->type
  32                                 && !strcmp(matches->type, dev->node->type);
  33                 if (matches->compatible[0])
  34                         match &= device_is_compatible(dev->node,
  35                                 matches->compatible);
  36                 if (match)
  37                         return matches;
  38                 matches++;
  39         }
  40         return NULL;
  41 }
  42
  43 static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
  44 {
  45         struct of_device * of_dev = to_of_device(dev);
  46         struct of_platform_driver * of_drv = to_of_platform_driver(drv);
  47         const struct of_device_id * matches = of_drv->match_table;
  48
  49         if (!matches)
  50                 return 0;
  51
  52         return of_match_device(matches, of_dev) != NULL;
  53 }
  54
  55 struct of_device *of_dev_get(struct of_device *dev)
  56 {
  57         struct device *tmp;
  58
  59         if (!dev)
  60                 return NULL;
  61         tmp = get_device(&dev->dev);
  62         if (tmp)
  63                 return to_of_device(tmp);
  64         else
  65                 return NULL;
  66 }
  67
  68 void of_dev_put(struct of_device *dev)
  69 {
  70         if (dev)
  71                 put_device(&dev->dev);
  72 }
  73
  74
  75 static int of_device_probe(struct device *dev)
  76 {
  77         int error = -ENODEV;
  78         struct of_platform_driver *drv;
  79         struct of_device *of_dev;
  80         const struct of_device_id *match;
  81
  82         drv = to_of_platform_driver(dev->driver);
  83         of_dev = to_of_device(dev);
  84
  85         if (!drv->probe)
  86                 return error;
  87
  88         of_dev_get(of_dev);
  89
  90         match = of_match_device(drv->match_table, of_dev);
  91         if (match)
  92                 error = drv->probe(of_dev, match);
  93         if (error)
  94                 of_dev_put(of_dev);
  95
  96         return error;
  97 }
  98
  99 static int of_device_remove(struct device *dev)
 100 {
 101         struct of_device * of_dev = to_of_device(dev);
 102         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
 103
 104         if (dev->driver && drv->remove)
 105                 drv->remove(of_dev);
 106         return 0;
 107 }
 108
 109 static int of_device_suspend(struct device *dev, pm_message_t state)
 110 {
 111         struct of_device * of_dev = to_of_device(dev);
 112         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
 113         int error = 0;
 114
 115         if (dev->driver && drv->suspend)
 116                 error = drv->suspend(of_dev, state);
 117         return error;
 118 }
 119
 120 static int of_device_resume(struct device * dev)
 121 {
 122         struct of_device * of_dev = to_of_device(dev);
 123         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
 124         int error = 0;
 125
 126         if (dev->driver && drv->resume)
 127                 error = drv->resume(of_dev);
 128         return error;
 129 }
 130
 131 struct bus_type of_platform_bus_type = {
 132        .name    = "of_platform",
 133        .match   = of_platform_bus_match,
 134        .probe   = of_device_probe,
 135        .remove  = of_device_remove,
 136        .suspend = of_device_suspend,
 137        .resume  = of_device_resume,
 138 };
 139
 140 static int __init of_bus_driver_init(void)
 141 {
 142         return bus_register(&of_platform_bus_type);
 143 }
 144
 145 postcore_initcall(of_bus_driver_init);
 146
 147 int of_register_driver(struct of_platform_driver *drv)
 148 {
 149         /* initialize common driver fields */
 150         drv->driver.name = drv->name;
 151         drv->driver.bus = &of_platform_bus_type;
 152
 153         /* register with core */
 154         return driver_register(&drv->driver);
 155 }
 156
 157 void of_unregister_driver(struct of_platform_driver *drv)
 158 {
 159         driver_unregister(&drv->driver);
 160 }
 161
 162
 163 static ssize_t dev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
 164 {
 165         struct of_device *ofdev;
 166
 167         ofdev = to_of_device(dev);
 168         return sprintf(buf, "%s", ofdev->node->full_name);
 169 }
 170
 171 static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
 172
 173 /**
 174  * of_release_dev - free an of device structure when all users of it are finished.
 175  * @dev: device that's been disconnected
 176  *
 177  * Will be called only by the device core when all users of this of device are
 178  * done.
 179  */
 180 void of_release_dev(struct device *dev)
 181 {
 182         struct of_device *ofdev;
 183
 184         ofdev = to_of_device(dev);
 185         of_node_put(ofdev->node);
 186         kfree(ofdev);
 187 }
 188
 189 int of_device_register(struct of_device *ofdev)
 190 {
 191         int rc;
 192
 193         BUG_ON(ofdev->node == NULL);
 194
 195         rc = device_register(&ofdev->dev);
 196         if (rc)
 197                 return rc;
 198
 199         device_create_file(&ofdev->dev, &dev_attr_devspec);
 200
 201         return 0;
 202 }
 203
 204 void of_device_unregister(struct of_device *ofdev)
 205 {
 206         device_remove_file(&ofdev->dev, &dev_attr_devspec);
 207
 208         device_unregister(&ofdev->dev);
 209 }
 210
 211 struct of_device* of_platform_device_create(struct device_node *np,
 212                                             const char *bus_id,
 213                                             struct device *parent)
 214 {
 215         struct of_device *dev;
 216
 217         dev = kmalloc(sizeof(*dev), GFP_KERNEL);
 218         if (!dev)
 219                 return NULL;
 220         memset(dev, 0, sizeof(*dev));
 221
 222         dev->node = of_node_get(np);
 223         dev->dma_mask = 0xffffffffUL;
 224         dev->dev.dma_mask = &dev->dma_mask;
 225         dev->dev.parent = parent;
 226         dev->dev.bus = &of_platform_bus_type;
 227         dev->dev.release = of_release_dev;
 228
 229         strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
 230
 231         if (of_device_register(dev) != 0) {
 232                 kfree(dev);
 233                 return NULL;
 234         }
 235
 236         return dev;
 237 }
 238
 239 EXPORT_SYMBOL(of_match_device);
 240 EXPORT_SYMBOL(of_platform_bus_type);
 241 EXPORT_SYMBOL(of_register_driver);
 242 EXPORT_SYMBOL(of_unregister_driver);
 243 EXPORT_SYMBOL(of_device_register);
 244 EXPORT_SYMBOL(of_device_unregister);
 245 EXPORT_SYMBOL(of_dev_get);
 246 EXPORT_SYMBOL(of_dev_put);
 247 EXPORT_SYMBOL(of_platform_device_create);
 248 EXPORT_SYMBOL(of_release_dev);