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of_device.c

#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
#include <linux/of_device.h>

#include <asm/errno.h>
#include <asm/dcr.h>

static void of_device_make_bus_id(struct of_device *dev)
{
      static atomic_t bus_no_reg_magic;
      struct device_node *node = dev->node;
      char *name = dev->dev.bus_id;
      const u32 *reg;
      u64 addr;
      int magic;

      /*
       * If it's a DCR based device, use 'd' for native DCRs
       * and 'D' for MMIO DCRs.
       */
#ifdef CONFIG_PPC_DCR
      reg = of_get_property(node, "dcr-reg", NULL);
      if (reg) {
#ifdef CONFIG_PPC_DCR_NATIVE
            snprintf(name, BUS_ID_SIZE, "d%x.%s",
                   *reg, node->name);
#else /* CONFIG_PPC_DCR_NATIVE */
            addr = of_translate_dcr_address(node, *reg, NULL);
            if (addr != OF_BAD_ADDR) {
                  snprintf(name, BUS_ID_SIZE,
                         "D%llx.%s", (unsigned long long)addr,
                         node->name);
                  return;
            }
#endif /* !CONFIG_PPC_DCR_NATIVE */
      }
#endif /* CONFIG_PPC_DCR */

      /*
       * For MMIO, get the physical address
       */
      reg = of_get_property(node, "reg", NULL);
      if (reg) {
            addr = of_translate_address(node, reg);
            if (addr != OF_BAD_ADDR) {
                  snprintf(name, BUS_ID_SIZE,
                         "%llx.%s", (unsigned long long)addr,
                         node->name);
                  return;
            }
      }

      /*
       * No BusID, use the node name and add a globally incremented
       * counter (and pray...)
       */
      magic = atomic_add_return(1, &bus_no_reg_magic);
      snprintf(name, BUS_ID_SIZE, "%s.%d", node->name, magic - 1);
}

struct of_device *of_device_alloc(struct device_node *np,
                          const char *bus_id,
                          struct device *parent)
{
      struct of_device *dev;

      dev = kzalloc(sizeof(*dev), GFP_KERNEL);
      if (!dev)
            return NULL;

      dev->node = of_node_get(np);
      dev->dev.dma_mask = &dev->dma_mask;
      dev->dev.parent = parent;
      dev->dev.release = of_release_dev;
      dev->dev.archdata.of_node = np;

      if (bus_id)
            strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
      else
            of_device_make_bus_id(dev);

      return dev;
}
EXPORT_SYMBOL(of_device_alloc);

int of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
{
      struct of_device *ofdev;
      const char *compat;
      int seen = 0, cplen, sl;

      if (!dev)
            return -ENODEV;

      ofdev = to_of_device(dev);

      if (add_uevent_var(env, "OF_NAME=%s", ofdev->node->name))
            return -ENOMEM;

      if (add_uevent_var(env, "OF_TYPE=%s", ofdev->node->type))
            return -ENOMEM;

        /* Since the compatible field can contain pretty much anything
         * it's not really legal to split it out with commas. We split it
         * up using a number of environment variables instead. */

      compat = of_get_property(ofdev->node, "compatible", &cplen);
      while (compat && *compat && cplen > 0) {
            if (add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat))
                  return -ENOMEM;

            sl = strlen (compat) + 1;
            compat += sl;
            cplen -= sl;
            seen++;
      }

      if (add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen))
            return -ENOMEM;

      /* modalias is trickier, we add it in 2 steps */
      if (add_uevent_var(env, "MODALIAS="))
            return -ENOMEM;
      sl = of_device_get_modalias(ofdev, &env->buf[env->buflen-1],
                            sizeof(env->buf) - env->buflen);
      if (sl >= (sizeof(env->buf) - env->buflen))
            return -ENOMEM;
      env->buflen += sl;

      return 0;
}
EXPORT_SYMBOL(of_device_uevent);
EXPORT_SYMBOL(of_device_get_modalias);

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