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