w1: slaves: w1_ds2760: convert to use w1_family_ops.groups

This moves the sysfs file creation/removal to the w1 core by using the
.groups field, saving code in the slave driver.
Acked-by: NEvgeniy Polyakov <zbr@ioremap.net>
Cc: Alexander Stein <alexander.stein@informatik.tu-chemnitz.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/w1/slaves/w1_ds2760.c

@@ -97,21 +97,28 @@ int w1_ds2760_recall_eeprom(struct device *dev, int addr)
 	return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_RECALL_DATA);
 }
 
-static ssize_t w1_ds2760_read_bin(struct file *filp, struct kobject *kobj,
-				  struct bin_attribute *bin_attr,
-				  char *buf, loff_t off, size_t count)
+static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
+			     struct bin_attribute *bin_attr, char *buf,
+			     loff_t off, size_t count)
 {
 	struct device *dev = container_of(kobj, struct device, kobj);
 	return w1_ds2760_read(dev, buf, off, count);
 }
 
-static struct bin_attribute w1_ds2760_bin_attr = {
-	.attr = {
-		.name = "w1_slave",
-		.mode = S_IRUGO,
-	},
-	.size = DS2760_DATA_SIZE,
-	.read = w1_ds2760_read_bin,
+static BIN_ATTR_RO(w1_slave, DS2760_DATA_SIZE);
+
+static struct bin_attribute *w1_ds2760_bin_attrs[] = {
+	&bin_attr_w1_slave,
+	NULL,
+};
+
+static const struct attribute_group w1_ds2760_group = {
+	.bin_attrs = w1_ds2760_bin_attrs,
+};
+
+static const struct attribute_group *w1_ds2760_groups[] = {
+	&w1_ds2760_group,
+	NULL,
 };
 
 static DEFINE_IDA(bat_ida);
@@ -139,16 +146,10 @@ static int w1_ds2760_add_slave(struct w1_slave *sl)
 	if (ret)
 		goto pdev_add_failed;
 
-	ret = sysfs_create_bin_file(&sl->dev.kobj, &w1_ds2760_bin_attr);
-	if (ret)
-		goto bin_attr_failed;
-
 	dev_set_drvdata(&sl->dev, pdev);
 
 	goto success;
 
-bin_attr_failed:
-	platform_device_del(pdev);
 pdev_add_failed:
 	platform_device_put(pdev);
 pdev_alloc_failed:
@@ -165,12 +166,12 @@ static void w1_ds2760_remove_slave(struct w1_slave *sl)
 
 	platform_device_unregister(pdev);
 	ida_simple_remove(&bat_ida, id);
-	sysfs_remove_bin_file(&sl->dev.kobj, &w1_ds2760_bin_attr);
 }
 
 static struct w1_family_ops w1_ds2760_fops = {
 	.add_slave    = w1_ds2760_add_slave,
 	.remove_slave = w1_ds2760_remove_slave,
+	.groups       = w1_ds2760_groups,
 };
 
 static struct w1_family w1_ds2760_family = {