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From:   Heiner Kallweit <hkallweit1@gmail.com>
Subject: [PATCH v2] eeprom: ee1004: Let device core handle attribute eeprom
To:     Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
References: <66e9f6e5-fdee-6963-6131-228c69705350@gmail.com>
Message-ID: <082be5db-46ef-6ddd-c33f-b30d5037a3f5@gmail.com>
Date:   Thu, 20 May 2021 21:25:03 +0200
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Precedence: bulk

Instead of creating/removing the attribute ourselves, just declare the
attribute and let the device core handle it. This allows to simplify
the code.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
v2:
- open-code the proposed BIN_ATTRIBUTES_GROUPS macro
I leave it to you which version you prefer.
---
 drivers/misc/eeprom/ee1004.c | 30 +++++++++++++-----------------
 1 file changed, 13 insertions(+), 17 deletions(-)

diff --git a/drivers/misc/eeprom/ee1004.c b/drivers/misc/eeprom/ee1004.c
index 252e15ba6..d61acdaba 100644
--- a/drivers/misc/eeprom/ee1004.c
+++ b/drivers/misc/eeprom/ee1004.c
@@ -89,7 +89,7 @@ static ssize_t ee1004_eeprom_read(struct i2c_client *client, char *buf,
 	return status;
 }
 
-static ssize_t ee1004_read(struct file *filp, struct kobject *kobj,
+static ssize_t eeprom_read(struct file *filp, struct kobject *kobj,
 			   struct bin_attribute *bin_attr,
 			   char *buf, loff_t off, size_t count)
 {
@@ -160,15 +160,19 @@ static ssize_t ee1004_read(struct file *filp, struct kobject *kobj,
 	return requested;
 }
 
-static const struct bin_attribute eeprom_attr = {
-	.attr = {
-		.name = "eeprom",
-		.mode = 0444,
-	},
-	.size = EE1004_EEPROM_SIZE,
-	.read = ee1004_read,
+static BIN_ATTR_RO(eeprom, EE1004_EEPROM_SIZE);
+
+static struct bin_attribute *ee1004_attrs[] = {
+	&bin_attr_eeprom,
+	NULL
+};
+
+static const struct attribute_group ee1004_group = {
+	.bin_attrs = ee1004_attrs,
 };
 
+__ATTRIBUTE_GROUPS(ee1004);
+
 static int ee1004_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
@@ -222,11 +226,6 @@ static int ee1004_probe(struct i2c_client *client,
 		ee1004_current_page);
 	mutex_unlock(&ee1004_bus_lock);
 
-	/* Create the sysfs eeprom file */
-	err = sysfs_create_bin_file(&client->dev.kobj, &eeprom_attr);
-	if (err)
-		goto err_clients_lock;
-
 	dev_info(&client->dev,
 		 "%u byte EE1004-compliant SPD EEPROM, read-only\n",
 		 EE1004_EEPROM_SIZE);
@@ -237,8 +236,6 @@ static int ee1004_probe(struct i2c_client *client,
 
 	return 0;
 
- err_clients_lock:
-	mutex_lock(&ee1004_bus_lock);
  err_clients:
 	if (--ee1004_dev_count == 0) {
 		for (cnr--; cnr >= 0; cnr--) {
@@ -255,8 +252,6 @@ static int ee1004_remove(struct i2c_client *client)
 {
 	int i;
 
-	sysfs_remove_bin_file(&client->dev.kobj, &eeprom_attr);
-
 	/* Remove page select clients if this is the last device */
 	mutex_lock(&ee1004_bus_lock);
 	if (--ee1004_dev_count == 0) {
@@ -275,6 +270,7 @@ static int ee1004_remove(struct i2c_client *client)
 static struct i2c_driver ee1004_driver = {
 	.driver = {
 		.name = "ee1004",
+		.dev_groups = ee1004_groups,
 	},
 	.probe = ee1004_probe,
 	.remove = ee1004_remove,
-- 
2.31.1