+#ifdef CONFIG_HOTPLUG
+static int w1_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size)
+{
+ struct w1_master *md = NULL;
+ struct w1_slave *sl = NULL;
+ char *event_owner, *name;
+ int err, cur_index=0, cur_len=0;
+
+ if (dev->driver == &w1_master_driver) {
+ md = container_of(dev, struct w1_master, dev);
+ event_owner = "master";
+ name = md->name;
+ } else if (dev->driver == &w1_slave_driver) {
+ sl = container_of(dev, struct w1_slave, dev);
+ event_owner = "slave";
+ name = sl->name;
+ } else {
+ dev_dbg(dev, "Unknown hotplug event.\n");
+ return -EINVAL;
+ }
+
+ dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", event_owner, name, dev->bus_id);
+
+ if (dev->driver != &w1_slave_driver || !sl)
+ return 0;
+
+ err = add_hotplug_env_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_FID=%02X", sl->reg_num.family);
+ if (err)
+ return err;
+
+ err = add_hotplug_env_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_SLAVE_ID=%024LX", (u64)sl->reg_num.id);
+ if (err)
+ return err;
+
+ return 0;
+};
+#else
+static int w1_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size)
+{
+ return 0;
+}
+#endif
+