Subject: [PATCH v2] ALSA: aoa: convert bus code to use dev_groups

From: Quentin Lambert <[email-masked]>
Date: Thu, 11 Jun 2015 10:03:38 +0200

The dev_attrs field of struct bus_type is going away, use dev_groups instead.
This converts the soundbus code to use the correct field.

Given that all other usages of the macro define the struct attribute
*xxx_attrs[] in the same file they assign the .dev_groups field, this patch
merges sysfs.c into core.c.

These modifications were made using Coccinelle.

Signed-off-by: Quentin Lambert <[email-masked]>
---
 Changes since v1:
  - Fix the commit message to actually talk about soundbus rather than MDIO
  - This version attempt to fix a problem resulting from the macro
    ATTRIBUTE_GROUPS declaring the structure as static by merging sysfs.c into
    core.c. I understand that this may not be the prefered solution since 
    Takashi suggested that adding a comment line to the previous version could
    be acceptable. 

 sound/aoa/soundbus/Makefile   |    2 -
 sound/aoa/soundbus/core.c     |   44 +++++++++++++++++++++++++++++++++++++++++-
 sound/aoa/soundbus/soundbus.h |    2 -
 sound/aoa/soundbus/sysfs.c    |   42 ----------------------------------------
 4 files changed, 44 insertions(+), 46 deletions(-)

--- a/sound/aoa/soundbus/Makefile
+++ b/sound/aoa/soundbus/Makefile
@@ -1,3 +1,3 @@
 obj-$(CONFIG_SND_AOA_SOUNDBUS) += snd-aoa-soundbus.o
-snd-aoa-soundbus-objs := core.o sysfs.o
+snd-aoa-soundbus-objs := core.o
 obj-$(CONFIG_SND_AOA_SOUNDBUS_I2S) += i2sbus/
--- a/sound/aoa/soundbus/core.c
+++ b/sound/aoa/soundbus/core.c
@@ -150,6 +150,48 @@ static int soundbus_device_resume(struct
 
 #endif /* CONFIG_PM */
 
+#define soundbus_config_of_attr(field, format_string)			\
+static ssize_t								\
+field##_show (struct device *dev, struct device_attribute *attr,	\
+              char *buf)						\
+{									\
+	struct soundbus_dev *mdev = to_soundbus_device (dev);		\
+	return sprintf (buf, format_string, mdev->ofdev.dev.of_node->field); \
+}
+
+static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	struct soundbus_dev *sdev = to_soundbus_device(dev);
+	struct platform_device *of = &sdev->ofdev;
+	int length;
+
+	if (*sdev->modalias) {
+		strlcpy(buf, sdev->modalias, sizeof(sdev->modalias) + 1);
+		strcat(buf, "\n");
+		length = strlen(buf);
+	} else {
+		length = sprintf(buf, "of:N%sT%s\n",
+				 of->dev.of_node->name, of->dev.of_node->type);
+	}
+
+	return length;
+}
+static DEVICE_ATTR_RO(modalias);
+
+soundbus_config_of_attr (name, "%s\n");
+static DEVICE_ATTR_RO(name);
+soundbus_config_of_attr (type, "%s\n");
+static DEVICE_ATTR_RO(type);
+
+struct attribute *soundbus_dev_attrs[] = {
+	&dev_attr_name.attr,
+	&dev_attr_type.attr,
+	&dev_attr_modalias.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(soundbus_dev);
+
 static struct bus_type soundbus_bus_type = {
 	.name		= "aoa-soundbus",
 	.probe		= soundbus_probe,
@@ -160,7 +202,7 @@ static struct bus_type soundbus_bus_type
 	.suspend	= soundbus_device_suspend,
 	.resume		= soundbus_device_resume,
 #endif
-	.dev_attrs	= soundbus_dev_attrs,
+	.dev_groups	= soundbus_dev_groups,
 };
 
 int soundbus_add_one(struct soundbus_dev *dev)
--- a/sound/aoa/soundbus/soundbus.h
+++ b/sound/aoa/soundbus/soundbus.h
@@ -199,6 +199,4 @@ struct soundbus_driver {
 extern int soundbus_register_driver(struct soundbus_driver *drv);
 extern void soundbus_unregister_driver(struct soundbus_driver *drv);
 
-extern struct device_attribute soundbus_dev_attrs[];
-
 #endif /* __SOUNDBUS_H */
--- a/sound/aoa/soundbus/sysfs.c
+++ /dev/null
@@ -1,42 +0,0 @@
-#include <linux/kernel.h>
-#include <linux/stat.h>
-/* FIX UP */
-#include "soundbus.h"
-
-#define soundbus_config_of_attr(field, format_string)			\
-static ssize_t								\
-field##_show (struct device *dev, struct device_attribute *attr,	\
-              char *buf)						\
-{									\
-	struct soundbus_dev *mdev = to_soundbus_device (dev);		\
-	return sprintf (buf, format_string, mdev->ofdev.dev.of_node->field); \
-}
-
-static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
-			     char *buf)
-{
-	struct soundbus_dev *sdev = to_soundbus_device(dev);
-	struct platform_device *of = &sdev->ofdev;
-	int length;
-
-	if (*sdev->modalias) {
-		strlcpy(buf, sdev->modalias, sizeof(sdev->modalias) + 1);
-		strcat(buf, "\n");
-		length = strlen(buf);
-	} else {
-		length = sprintf(buf, "of:N%sT%s\n",
-				 of->dev.of_node->name, of->dev.of_node->type);
-	}
-
-	return length;
-}
-
-soundbus_config_of_attr (name, "%s\n");
-soundbus_config_of_attr (type, "%s\n");
-
-struct device_attribute soundbus_dev_attrs[] = {
-	__ATTR_RO(name),
-	__ATTR_RO(type),
-	__ATTR_RO(modalias),
-	__ATTR_NULL
-};