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->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->node = of_node_get(np);
  53         dev->dev.dma_mask = &dev->dma_mask;
  54         dev->dev.parent = parent;
  55         dev->dev.release = of_release_dev;
  56         dev->dev.archdata.of_node = np;
  57         dev->dev.of_node = np;
  58
  59         if (bus_id)
  60                 dev_set_name(&dev->dev, bus_id);
  61         else
  62                 of_device_make_bus_id(dev);
  63
  64         return dev;
  65 }
  66 EXPORT_SYMBOL(of_device_alloc);
  67
  68 int of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
  69 {
  70         struct of_device *ofdev;
  71         const char *compat;
  72         int seen = 0, cplen, sl;
  73
  74         if (!dev)
  75                 return -ENODEV;
  76
  77         ofdev = to_of_device(dev);
  78
  79         if (add_uevent_var(env, "OF_NAME=%s", ofdev->node->name))
  80                 return -ENOMEM;
  81
  82         if (add_uevent_var(env, "OF_TYPE=%s", ofdev->node->type))
  83                 return -ENOMEM;
  84
  85         /* Since the compatible field can contain pretty much anything
  86          * it's not really legal to split it out with commas. We split it
  87          * up using a number of environment variables instead. */
  88
  89         compat = of_get_property(ofdev->node, "compatible", &cplen);
  90         while (compat && *compat && cplen > 0) {
  91                 if (add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat))
  92                         return -ENOMEM;
  93
  94                 sl = strlen(compat) + 1;
  95                 compat += sl;
  96                 cplen -= sl;
  97                 seen++;
  98         }
  99
 100         if (add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen))
 101                 return -ENOMEM;
 102
 103         /* modalias is trickier, we add it in 2 steps */
 104         if (add_uevent_var(env, "MODALIAS="))
 105                 return -ENOMEM;
 106         sl = of_device_get_modalias(ofdev, &env->buf[env->buflen-1],
 107                                     sizeof(env->buf) - env->buflen);
 108         if (sl >= (sizeof(env->buf) - env->buflen))
 109                 return -ENOMEM;
 110         env->buflen += sl;
 111
 112         return 0;
 113 }
 114 EXPORT_SYMBOL(of_device_uevent);