arch/powerpc/kernel/of_device.c

   1 #include <linux/config.h>
   2 #include <linux/string.h>
   3 #include <linux/kernel.h>
   4 #include <linux/init.h>
   5 #include <linux/module.h>
   6 #include <linux/mod_devicetable.h>
   7 #include <asm/errno.h>
   8 #include <asm/of_device.h>
   9
  10 /**
  11  * of_match_device - Tell if an of_device structure has a matching
  12  * of_match structure
  13  * @ids: array of of device match structures to search in
  14  * @dev: the of device structure to match against
  15  *
  16  * Used by a driver to check whether an of_device present in the
  17  * system is in its list of supported devices.
  18  */
  19 const struct of_device_id *of_match_device(const struct of_device_id *matches,
  20                                         const struct of_device *dev)
  21 {
  22         if (!dev->node)
  23                 return NULL;
  24         while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
  25                 int match = 1;
  26                 if (matches->name[0])
  27                         match &= dev->node->name
  28                                 && !strcmp(matches->name, dev->node->name);
  29                 if (matches->type[0])
  30                         match &= dev->node->type
  31                                 && !strcmp(matches->type, dev->node->type);
  32                 if (matches->compatible[0])
  33                         match &= device_is_compatible(dev->node,
  34                                 matches->compatible);
  35                 if (match)
  36                         return matches;
  37                 matches++;
  38         }
  39         return NULL;
  40 }
  41
  42 static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
  43 {
  44         struct of_device * of_dev = to_of_device(dev);
  45         struct of_platform_driver * of_drv = to_of_platform_driver(drv);
  46         const struct of_device_id * matches = of_drv->match_table;
  47
  48         if (!matches)
  49                 return 0;
  50
  51         return of_match_device(matches, of_dev) != NULL;
  52 }
  53
  54 struct of_device *of_dev_get(struct of_device *dev)
  55 {
  56         struct device *tmp;
  57
  58         if (!dev)
  59                 return NULL;
  60         tmp = get_device(&dev->dev);
  61         if (tmp)
  62                 return to_of_device(tmp);
  63         else
  64                 return NULL;
  65 }
  66
  67 void of_dev_put(struct of_device *dev)
  68 {
  69         if (dev)
  70                 put_device(&dev->dev);
  71 }
  72
  73
  74 static int of_device_probe(struct device *dev)
  75 {
  76         int error = -ENODEV;
  77         struct of_platform_driver *drv;
  78         struct of_device *of_dev;
  79         const struct of_device_id *match;
  80
  81         drv = to_of_platform_driver(dev->driver);
  82         of_dev = to_of_device(dev);
  83
  84         if (!drv->probe)
  85                 return error;
  86
  87         of_dev_get(of_dev);
  88
  89         match = of_match_device(drv->match_table, of_dev);
  90         if (match)
  91                 error = drv->probe(of_dev, match);
  92         if (error)
  93                 of_dev_put(of_dev);
  94
  95         return error;
  96 }
  97
  98 static int of_device_remove(struct device *dev)
  99 {
 100         struct of_device * of_dev = to_of_device(dev);
 101         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
 102
 103         if (dev->driver && drv->remove)
 104                 drv->remove(of_dev);
 105         return 0;
 106 }
 107
 108 static int of_device_suspend(struct device *dev, pm_message_t state)
 109 {
 110         struct of_device * of_dev = to_of_device(dev);
 111         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
 112         int error = 0;
 113
 114         if (dev->driver && drv->suspend)
 115                 error = drv->suspend(of_dev, state);
 116         return error;
 117 }
 118
 119 static int of_device_resume(struct device * dev)
 120 {
 121         struct of_device * of_dev = to_of_device(dev);
 122         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
 123         int error = 0;
 124
 125         if (dev->driver && drv->resume)
 126                 error = drv->resume(of_dev);
 127         return error;
 128 }
 129
 130 struct bus_type of_platform_bus_type = {
 131        .name    = "of_platform",
 132        .match   = of_platform_bus_match,
 133        .suspend = of_device_suspend,
 134        .resume  = of_device_resume,
 135 };
 136
 137 static int __init of_bus_driver_init(void)
 138 {
 139         return bus_register(&of_platform_bus_type);
 140 }
 141
 142 postcore_initcall(of_bus_driver_init);
 143
 144 int of_register_driver(struct of_platform_driver *drv)
 145 {
 146         int count = 0;
 147
 148         /* initialize common driver fields */
 149         drv->driver.name = drv->name;
 150         drv->driver.bus = &of_platform_bus_type;
 151         drv->driver.probe = of_device_probe;
 152         drv->driver.remove = of_device_remove;
 153
 154         /* register with core */
 155         count = driver_register(&drv->driver);
 156         return count ? count : 1;
 157 }
 158
 159 void of_unregister_driver(struct of_platform_driver *drv)
 160 {
 161         driver_unregister(&drv->driver);
 162 }
 163
 164
 165 static ssize_t dev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
 166 {
 167         struct of_device *ofdev;
 168
 169         ofdev = to_of_device(dev);
 170         return sprintf(buf, "%s", ofdev->node->full_name);
 171 }
 172
 173 static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
 174
 175 /**
 176  * of_release_dev - free an of device structure when all users of it are finished.
 177  * @dev: device that's been disconnected
 178  *
 179  * Will be called only by the device core when all users of this of device are
 180  * done.
 181  */
 182 void of_release_dev(struct device *dev)
 183 {
 184         struct of_device *ofdev;
 185
 186         ofdev = to_of_device(dev);
 187         of_node_put(ofdev->node);
 188         kfree(ofdev);
 189 }
 190
 191 int of_device_register(struct of_device *ofdev)
 192 {
 193         int rc;
 194         struct of_device **odprop;
 195
 196         BUG_ON(ofdev->node == NULL);
 197
 198         odprop = (struct of_device **)get_property(ofdev->node, "linux,device", NULL);
 199         if (!odprop) {
 200                 struct property *new_prop;
 201
 202                 new_prop = kmalloc(sizeof(struct property) + sizeof(struct of_device *),
 203                         GFP_KERNEL);
 204                 if (new_prop == NULL)
 205                         return -ENOMEM;
 206                 new_prop->name = "linux,device";
 207                 new_prop->length = sizeof(sizeof(struct of_device *));
 208                 new_prop->value = (unsigned char *)&new_prop[1];
 209                 odprop = (struct of_device **)new_prop->value;
 210                 *odprop = NULL;
 211                 prom_add_property(ofdev->node, new_prop);
 212         }
 213         *odprop = ofdev;
 214
 215         rc = device_register(&ofdev->dev);
 216         if (rc)
 217                 return rc;
 218
 219         device_create_file(&ofdev->dev, &dev_attr_devspec);
 220
 221         return 0;
 222 }
 223
 224 void of_device_unregister(struct of_device *ofdev)
 225 {
 226         struct of_device **odprop;
 227
 228         device_remove_file(&ofdev->dev, &dev_attr_devspec);
 229
 230         odprop = (struct of_device **)get_property(ofdev->node, "linux,device", NULL);
 231         if (odprop)
 232                 *odprop = NULL;
 233
 234         device_unregister(&ofdev->dev);
 235 }
 236
 237 struct of_device* of_platform_device_create(struct device_node *np,
 238                                             const char *bus_id,
 239                                             struct device *parent)
 240 {
 241         struct of_device *dev;
 242
 243         dev = kmalloc(sizeof(*dev), GFP_KERNEL);
 244         if (!dev)
 245                 return NULL;
 246         memset(dev, 0, sizeof(*dev));
 247
 248         dev->node = of_node_get(np);
 249         dev->dma_mask = 0xffffffffUL;
 250         dev->dev.dma_mask = &dev->dma_mask;
 251         dev->dev.parent = parent;
 252         dev->dev.bus = &of_platform_bus_type;
 253         dev->dev.release = of_release_dev;
 254
 255         strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
 256
 257         if (of_device_register(dev) != 0) {
 258                 kfree(dev);
 259                 return NULL;
 260         }
 261
 262         return dev;
 263 }
 264
 265 EXPORT_SYMBOL(of_match_device);
 266 EXPORT_SYMBOL(of_platform_bus_type);
 267 EXPORT_SYMBOL(of_register_driver);
 268 EXPORT_SYMBOL(of_unregister_driver);
 269 EXPORT_SYMBOL(of_device_register);
 270 EXPORT_SYMBOL(of_device_unregister);
 271 EXPORT_SYMBOL(of_dev_get);
 272 EXPORT_SYMBOL(of_dev_put);
 273 EXPORT_SYMBOL(of_platform_device_create);
 274 EXPORT_SYMBOL(of_release_dev);