[PATCH] w1: Added add/remove slave callbacks.

Patch is based on work from Ben Gardner <bgardner@wabtec.com>

Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 67 insertions, 54 deletions

diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 39888af6d33d..e592ca2edd49 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -59,19 +59,6 @@ static pid_t control_thread;
 static int control_needs_exit;
 static DECLARE_COMPLETION(w1_control_complete);
 
-/* stuff for the default family */
-static ssize_t w1_famdefault_read_name(struct device *dev, struct device_attribute *attr, char *buf)
-{
-        struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
-        return(sprintf(buf, "%s\n", sl->name));
-}
-static struct w1_family_ops w1_default_fops = {
-        .rname = &w1_famdefault_read_name,
-};
-static struct w1_family w1_default_family = {
-        .fops = &w1_default_fops,
-};
-
 static int w1_master_match(struct device *dev, struct device_driver *drv)
 {
         return 1;
@@ -99,30 +86,47 @@ static void w1_slave_release(struct device *dev)
         complete(&sl->dev_released);
 }
 
-static ssize_t w1_default_read_name(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf)
 {
-        return sprintf(buf, "No family registered.\n");
+      struct w1_slave *sl = dev_to_w1_slave(dev);
+
+      return sprintf(buf, "%s\n", sl->name);
 }
 
-static ssize_t w1_default_read_bin(struct kobject *kobj, char *buf, loff_t off,
-                     size_t count)
+static ssize_t w1_slave_read_id(struct kobject *kobj, char *buf, loff_t off, size_t count)
 {
-        return sprintf(buf, "No family registered.\n");
-}
+      struct w1_slave *sl = kobj_to_w1_slave(kobj);
 
-static struct device_attribute w1_slave_attribute =
-        __ATTR(name, S_IRUGO, w1_default_read_name, NULL);
-
-static struct bin_attribute w1_slave_bin_attribute = {
-        .attr = {
-                .name = "w1_slave",
-                .mode = S_IRUGO,
-                .owner = THIS_MODULE,
-        },
-        .size = W1_SLAVE_DATA_SIZE,
-        .read = &w1_default_read_bin,
+      atomic_inc(&sl->refcnt);
+      if (off > 8) {
+              count = 0;
+        } else {
+                if (off + count > 8)
+                        count = 8 - off;
+
+                memcpy(buf, (u8 *)&sl->reg_num, count);
+        }
+        atomic_dec(&sl->refcnt);
+
+        return count;
+  }
+
+static struct device_attribute w1_slave_attr_name =
+        __ATTR(name, S_IRUGO, w1_slave_read_name, NULL);
+
+static struct bin_attribute w1_slave_attr_bin_id = {
+      .attr = {
+              .name = "id",
+              .mode = S_IRUGO,
+              .owner = THIS_MODULE,
+      },
+      .size = 8,
+      .read = w1_slave_read_id,
 };
 
+/* Default family */
+static struct w1_family w1_default_family;
+
 static int w1_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size);
 
 static struct bus_type w1_bus_type = {
@@ -413,36 +417,44 @@ static int __w1_attach_slave_device(struct w1_slave *sl)
                 return err;
         }
 
-        memcpy(&sl->attr_bin, &w1_slave_bin_attribute, sizeof(sl->attr_bin));
-        memcpy(&sl->attr_name, &w1_slave_attribute, sizeof(sl->attr_name));
-
-        sl->attr_bin.read = sl->family->fops->rbin;
-        sl->attr_name.show = sl->family->fops->rname;
+        /* Create "name" entry */
+        err = device_create_file(&sl->dev, &w1_slave_attr_name);
+        if (err < 0) {
+                dev_err(&sl->dev,
+                        "sysfs file creation for [%s] failed. err=%d\n",
+                        sl->dev.bus_id, err);
+                goto out_unreg;
+        }
 
-        err = device_create_file(&sl->dev, &sl->attr_name);
+        /* Create "id" entry */
+        err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
         if (err < 0) {
                 dev_err(&sl->dev,
                         "sysfs file creation for [%s] failed. err=%d\n",
                         sl->dev.bus_id, err);
-                device_unregister(&sl->dev);
-                return err;
+                goto out_rem1;
         }
 
-        if ( sl->attr_bin.read ) {
-                err = sysfs_create_bin_file(&sl->dev.kobj, &sl->attr_bin);
-                if (err < 0) {
-                        dev_err(&sl->dev,
-                                "sysfs file creation for [%s] failed. err=%d\n",
-                                sl->dev.bus_id, err);
-                        device_remove_file(&sl->dev, &sl->attr_name);
-                        device_unregister(&sl->dev);
-                        return err;
-                }
+        /* if the family driver needs to initialize something... */
+        if (sl->family->fops && sl->family->fops->add_slave &&
+            ((err = sl->family->fops->add_slave(sl)) < 0)) {
+                dev_err(&sl->dev,
+                        "sysfs file creation for [%s] failed. err=%d\n",
+                        sl->dev.bus_id, err);
+                goto out_rem2;
         }
 
         list_add_tail(&sl->w1_slave_entry, &sl->master->slist);
 
         return 0;
+
+out_rem2:
+        sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
+out_rem1:
+        device_remove_file(&sl->dev, &w1_slave_attr_name);
+out_unreg:
+        device_unregister(&sl->dev);
+        return err;
 }
 
 static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
@@ -517,10 +529,11 @@ static void w1_slave_detach(struct w1_slave *sl)
                         flush_signals(current);
         }
 
-        if ( sl->attr_bin.read ) {
-                sysfs_remove_bin_file (&sl->dev.kobj, &sl->attr_bin);
-        }
-        device_remove_file(&sl->dev, &sl->attr_name);
+        if (sl->family->fops && sl->family->fops->remove_slave)
+                sl->family->fops->remove_slave(sl);
+
+        sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
+        device_remove_file(&sl->dev, &w1_slave_attr_name);
         device_unregister(&sl->dev);
         w1_family_put(sl->family);
 
@@ -805,8 +818,8 @@ int w1_process(void *data)
                         if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) {
                                 list_del (&sl->w1_slave_entry);
 
-                                w1_slave_detach (sl);
-                                kfree (sl);
+                                w1_slave_detach(sl);
+                                kfree(sl);
 
                                 dev->slave_count--;
                         } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))