arch/ppc64/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 <asm/errno.h>
   7 #include <asm/of_device.h>
   8
   9 /**
  10  * of_match_device - Tell if an of_device structure has a matching
  11  * of_match structure
  12  * @ids: array of of device match structures to search in
  13  * @dev: the of device structure to match against
  14  *
  15  * Used by a driver to check whether an of_device present in the
  16  * system is in its list of supported devices.
  17  */
  18 const struct of_match * of_match_device(const struct of_match *matches,
  19                                         const struct of_device *dev)
  20 {
  21         if (!dev->node)
  22                 return NULL;
  23         while (matches->name || matches->type || matches->compatible) {
  24                 int match = 1;
  25                 if (matches->name && matches->name != OF_ANY_MATCH)
  26                         match &= dev->node->name
  27                                 && !strcmp(matches->name, dev->node->name);
  28                 if (matches->type && matches->type != OF_ANY_MATCH)
  29                         match &= dev->node->type
  30                                 && !strcmp(matches->type, dev->node->type);
  31                 if (matches->compatible && matches->compatible != OF_ANY_MATCH)
  32                         match &= device_is_compatible(dev->node,
  33                                 matches->compatible);
  34                 if (match)
  35                         return matches;
  36                 matches++;
  37         }
  38         return NULL;
  39 }
  40
  41 static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
  42 {
  43         struct of_device * of_dev = to_of_device(dev);
  44         struct of_platform_driver * of_drv = to_of_platform_driver(drv);
  45         const struct of_match * matches = of_drv->match_table;
  46
  47         if (!matches)
  48                 return 0;
  49
  50         return of_match_device(matches, of_dev) != NULL;
  51 }
  52
  53 struct of_device *of_dev_get(struct of_device *dev)
  54 {
  55         struct device *tmp;
  56
  57         if (!dev)
  58                 return NULL;
  59         tmp = get_device(&dev->dev);
  60         if (tmp)
  61                 return to_of_device(tmp);
  62         else
  63                 return NULL;
  64 }
  65
  66 void of_dev_put(struct of_device *dev)
  67 {
  68         if (dev)
  69                 put_device(&dev->dev);
  70 }
  71
  72
  73 static int of_device_probe(struct device *dev)
  74 {
  75         int error = -ENODEV;
  76         struct of_platform_driver *drv;
  77         struct of_device *of_dev;
  78         const struct of_match *match;
  79
  80         drv = to_of_platform_driver(dev->driver);
  81         of_dev = to_of_device(dev);
  82
  83         if (!drv->probe)
  84                 return error;
  85
  86         of_dev_get(of_dev);
  87
  88         match = of_match_device(drv->match_table, of_dev);
  89         if (match)
  90                 error = drv->probe(of_dev, match);
  91         if (error)
  92                 of_dev_put(of_dev);
  93
  94         return error;
  95 }
  96
  97 static int of_device_remove(struct device *dev)
  98 {
  99         struct of_device * of_dev = to_of_device(dev);
 100         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
 101
 102         if (dev->driver && drv->remove)
 103                 drv->remove(of_dev);
 104         return 0;
 105 }
 106
 107 static int of_device_suspend(struct device *dev, pm_message_t state)
 108 {
 109         struct of_device * of_dev = to_of_device(dev);
 110         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
 111         int error = 0;
 112
 113         if (dev->driver && drv->suspend)
 114                 error = drv->suspend(of_dev, state);
 115         return error;
 116 }
 117
 118 static int of_device_resume(struct device * dev)
 119 {
 120         struct of_device * of_dev = to_of_device(dev);
 121         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
 122         int error = 0;
 123
 124         if (dev->driver && drv->resume)
 125                 error = drv->resume(of_dev);
 126         return error;
 127 }
 128
 129 struct bus_type of_platform_bus_type = {
 130        .name    = "of_platform",
 131        .match   = of_platform_bus_match,
 132        .suspend = of_device_suspend,
 133        .resume  = of_device_resume,
 134 };
 135
 136 static int __init of_bus_driver_init(void)
 137 {
 138         return bus_register(&of_platform_bus_type);
 139 }
 140
 141 postcore_initcall(of_bus_driver_init);
 142
 143 int of_register_driver(struct of_platform_driver *drv)
 144 {
 145         int count = 0;
 146
 147         /* initialize common driver fields */
 148         drv->driver.name = drv->name;
 149         drv->driver.bus = &of_platform_bus_type;
 150         drv->driver.probe = of_device_probe;
 151         drv->driver.remove = of_device_remove;
 152
 153         /* register with core */
 154         count = driver_register(&drv->driver);
 155         return count ? count : 1;
 156 }
 157
 158 void of_unregister_driver(struct of_platform_driver *drv)
 159 {
 160         driver_unregister(&drv->driver);
 161 }
 162
 163
 164 static ssize_t dev_show_devspec(struct device *dev, char *buf)
 165 {
 166         struct of_device *ofdev;
 167
 168         ofdev = to_of_device(dev);
 169         return sprintf(buf, "%s", ofdev->node->full_name);
 170 }
 171
 172 static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
 173
 174 /**
 175  * of_release_dev - free an of device structure when all users of it are finished.
 176  * @dev: device that's been disconnected
 177  *
 178  * Will be called only by the device core when all users of this of device are
 179  * done.
 180  */
 181 void of_release_dev(struct device *dev)
 182 {
 183         struct of_device *ofdev;
 184
 185         ofdev = to_of_device(dev);
 186         kfree(ofdev);
 187 }
 188
 189 int of_device_register(struct of_device *ofdev)
 190 {
 191         int rc;
 192         struct of_device **odprop;
 193
 194         BUG_ON(ofdev->node == NULL);
 195
 196         odprop = (struct of_device **)get_property(ofdev->node, "linux,device", NULL);
 197         if (!odprop) {
 198                 struct property *new_prop;
 199
 200                 new_prop = kmalloc(sizeof(struct property) + sizeof(struct of_device *),
 201                         GFP_KERNEL);
 202                 if (new_prop == NULL)
 203                         return -ENOMEM;
 204                 new_prop->name = "linux,device";
 205                 new_prop->length = sizeof(sizeof(struct of_device *));
 206                 new_prop->value = (unsigned char *)&new_prop[1];
 207                 odprop = (struct of_device **)new_prop->value;
 208                 *odprop = NULL;
 209                 prom_add_property(ofdev->node, new_prop);
 210         }
 211         *odprop = ofdev;
 212
 213         rc = device_register(&ofdev->dev);
 214         if (rc)
 215                 return rc;
 216
 217         device_create_file(&ofdev->dev, &dev_attr_devspec);
 218
 219         return 0;
 220 }
 221
 222 void of_device_unregister(struct of_device *ofdev)
 223 {
 224         struct of_device **odprop;
 225
 226         device_remove_file(&ofdev->dev, &dev_attr_devspec);
 227
 228         odprop = (struct of_device **)get_property(ofdev->node, "linux,device", NULL);
 229         if (odprop)
 230                 *odprop = NULL;
 231
 232         device_unregister(&ofdev->dev);
 233 }
 234
 235 struct of_device* of_platform_device_create(struct device_node *np, const char *bus_id)
 236 {
 237         struct of_device *dev;
 238         u32 *reg;
 239
 240         dev = kmalloc(sizeof(*dev), GFP_KERNEL);
 241         if (!dev)
 242                 return NULL;
 243         memset(dev, 0, sizeof(*dev));
 244
 245         dev->node = np;
 246         dev->dma_mask = 0xffffffffUL;
 247         dev->dev.dma_mask = &dev->dma_mask;
 248         dev->dev.parent = NULL;
 249         dev->dev.bus = &of_platform_bus_type;
 250         dev->dev.release = of_release_dev;
 251
 252         reg = (u32 *)get_property(np, "reg", NULL);
 253         strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
 254
 255         if (of_device_register(dev) != 0) {
 256                 kfree(dev);
 257                 return NULL;
 258         }
 259
 260         return dev;
 261 }
 262
 263 EXPORT_SYMBOL(of_match_device);
 264 EXPORT_SYMBOL(of_platform_bus_type);
 265 EXPORT_SYMBOL(of_register_driver);
 266 EXPORT_SYMBOL(of_unregister_driver);
 267 EXPORT_SYMBOL(of_device_register);
 268 EXPORT_SYMBOL(of_device_unregister);
 269 EXPORT_SYMBOL(of_dev_get);
 270 EXPORT_SYMBOL(of_dev_put);
 271 EXPORT_SYMBOL(of_platform_device_create);
 272 EXPORT_SYMBOL(of_release_dev);