arch/microblaze/kernel/of_device.c

   1 #include <linux/string.h>
   2 #include <linux/kernel.h>
   3 #include <linux/of.h>
   4 #include <linux/init.h>
   5 #include <linux/module.h>
   6 #include <linux/mod_devicetable.h>
   7 #include <linux/slab.h>
   8 #include <linux/of_device.h>
   9
  10 #include <linux/errno.h>
  11
  12 void of_device_make_bus_id(struct of_device *dev)
  13 {
  14         static atomic_t bus_no_reg_magic;
  15         struct device_node *node = dev->dev.of_node;
  16         const u32 *reg;
  17         u64 addr;
  18         int magic;
  19
  20         /*
  21          * For MMIO, get the physical address
  22          */
  23         reg = of_get_property(node, "reg", NULL);
  24         if (reg) {
  25                 addr = of_translate_address(node, reg);
  26                 if (addr != OF_BAD_ADDR) {
  27                         dev_set_name(&dev->dev, "%llx.%s",
  28                                      (unsigned long long)addr, node->name);
  29                         return;
  30                 }
  31         }
  32
  33         /*
  34          * No BusID, use the node name and add a globally incremented
  35          * counter (and pray...)
  36          */
  37         magic = atomic_add_return(1, &bus_no_reg_magic);
  38         dev_set_name(&dev->dev, "%s.%d", node->name, magic - 1);
  39 }
  40 EXPORT_SYMBOL(of_device_make_bus_id);
  41
  42 struct of_device *of_device_alloc(struct device_node *np,
  43                                   const char *bus_id,
  44                                   struct device *parent)
  45 {
  46         struct of_device *dev;
  47
  48         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
  49         if (!dev)
  50                 return NULL;
  51
  52         dev->dev.of_node = of_node_get(np);
  53         dev->dev.dma_mask = &dev->archdata.dma_mask;
  54         dev->dev.parent = parent;
  55         dev->dev.release = of_release_dev;
  56
  57         if (bus_id)
  58                 dev_set_name(&dev->dev, bus_id);
  59         else
  60                 of_device_make_bus_id(dev);
  61
  62         return dev;
  63 }
  64 EXPORT_SYMBOL(of_device_alloc);
  65
  66 int of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
  67 {
  68         struct of_device *ofdev;
  69         const char *compat;
  70         int seen = 0, cplen, sl;
  71
  72         if (!dev)
  73                 return -ENODEV;
  74
  75         ofdev = to_of_device(dev);
  76
  77         if (add_uevent_var(env, "OF_NAME=%s", ofdev->dev.of_node->name))
  78                 return -ENOMEM;
  79
  80         if (add_uevent_var(env, "OF_TYPE=%s", ofdev->dev.of_node->type))
  81                 return -ENOMEM;
  82
  83         /* Since the compatible field can contain pretty much anything
  84          * it's not really legal to split it out with commas. We split it
  85          * up using a number of environment variables instead. */
  86
  87         compat = of_get_property(ofdev->dev.of_node, "compatible", &cplen);
  88         while (compat && *compat && cplen > 0) {
  89                 if (add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat))
  90                         return -ENOMEM;
  91
  92                 sl = strlen(compat) + 1;
  93                 compat += sl;
  94                 cplen -= sl;
  95                 seen++;
  96         }
  97
  98         if (add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen))
  99                 return -ENOMEM;
 100
 101         /* modalias is trickier, we add it in 2 steps */
 102         if (add_uevent_var(env, "MODALIAS="))
 103                 return -ENOMEM;
 104         sl = of_device_get_modalias(ofdev, &env->buf[env->buflen-1],
 105                                     sizeof(env->buf) - env->buflen);
 106         if (sl >= (sizeof(env->buf) - env->buflen))
 107                 return -ENOMEM;
 108         env->buflen += sl;
 109
 110         return 0;
 111 }
 112 EXPORT_SYMBOL(of_device_uevent);