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Date: Sat, 31 Aug 2013 15:24:36 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: devel@...verdev.osuosl.org
Cc: linux-kernel@...r.kernel.org,
Kroah-Hartman <gregkh@...uxfoundation.org>,
Jakub Schmidtke <sjakub@...il.com>,
Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH] staging: asus_oled: Create device attributes automatically
The 'enable' and 'picture' attributes are created for all oled_class devices.
They can be created automatically when creating the oled_class device.
This simplifies the code and ensures that the attributes exist when the
udev event announcing device registration is generated.
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
The class 'version' attribute could be created in a similar fashion, but that
would mean not using the existing class ABI defines and function to create
a class attribute displaying a fixed string. Since this is true for pretty much
every driver using CLASS_ATTR_STRING, a more generic solution might be better.
Compile tested only.
drivers/staging/asus_oled/asus_oled.c | 58 +++++++++++++--------------------
1 file changed, 23 insertions(+), 35 deletions(-)
diff --git a/drivers/staging/asus_oled/asus_oled.c b/drivers/staging/asus_oled/asus_oled.c
index 3654dc3..afe91b6 100644
--- a/drivers/staging/asus_oled/asus_oled.c
+++ b/drivers/staging/asus_oled/asus_oled.c
@@ -59,7 +59,6 @@ MODULE_DESCRIPTION("Asus OLED Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(ASUS_OLED_VERSION);
-static struct class *oled_class;
static int oled_num;
static uint start_off;
@@ -625,9 +624,18 @@ static DEVICE_ATTR(asus_oled_enabled, S_IWUSR | S_IRUGO,
get_enabled, set_enabled);
static DEVICE_ATTR(asus_oled_picture, S_IWUSR , NULL, set_picture);
-static DEVICE_ATTR(enabled, S_IWUSR | S_IRUGO,
- class_get_enabled, class_set_enabled);
-static DEVICE_ATTR(picture, S_IWUSR, NULL, class_set_picture);
+static struct device_attribute oled_dev_attributes[] = {
+ __ATTR(enabled, S_IWUSR | S_IRUGO, class_get_enabled,
+ class_set_enabled),
+ __ATTR(picture, S_IWUSR, NULL, class_set_picture),
+ { }
+};
+
+static struct class oled_class = {
+ .owner = THIS_MODULE,
+ .name = ASUS_OLED_UNDERSCORE_NAME,
+ .dev_attrs = oled_dev_attributes,
+};
static int asus_oled_probe(struct usb_interface *interface,
const struct usb_device_id *id)
@@ -693,24 +701,13 @@ static int asus_oled_probe(struct usb_interface *interface,
if (retval)
goto err_files;
- odev->dev = device_create(oled_class, &interface->dev, MKDEV(0, 0),
- NULL, "oled_%d", ++oled_num);
-
+ odev->dev = device_create(&oled_class, &interface->dev, MKDEV(0, 0),
+ odev, "oled_%d", ++oled_num);
if (IS_ERR(odev->dev)) {
retval = PTR_ERR(odev->dev);
goto err_files;
}
- dev_set_drvdata(odev->dev, odev);
-
- retval = device_create_file(odev->dev, &dev_attr_enabled);
- if (retval)
- goto err_class_enabled;
-
- retval = device_create_file(odev->dev, &dev_attr_picture);
- if (retval)
- goto err_class_picture;
-
dev_info(&interface->dev,
"Attached Asus OLED device: %s [width %u, pack_mode %d]\n",
desc, odev->dev_width, odev->pack_mode);
@@ -720,13 +717,6 @@ static int asus_oled_probe(struct usb_interface *interface,
return 0;
-err_class_picture:
- device_remove_file(odev->dev, &dev_attr_picture);
-
-err_class_enabled:
- device_remove_file(odev->dev, &dev_attr_enabled);
- device_unregister(odev->dev);
-
err_files:
device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled));
device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture));
@@ -745,8 +735,6 @@ static void asus_oled_disconnect(struct usb_interface *interface)
odev = usb_get_intfdata(interface);
usb_set_intfdata(interface, NULL);
- device_remove_file(odev->dev, &dev_attr_picture);
- device_remove_file(odev->dev, &dev_attr_enabled);
device_unregister(odev->dev);
device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture));
@@ -807,15 +795,15 @@ static CLASS_ATTR_STRING(version, S_IRUGO,
static int __init asus_oled_init(void)
{
- int retval = 0;
- oled_class = class_create(THIS_MODULE, ASUS_OLED_UNDERSCORE_NAME);
+ int retval;
- if (IS_ERR(oled_class)) {
- pr_err("Error creating " ASUS_OLED_UNDERSCORE_NAME " class\n");
- return PTR_ERR(oled_class);
+ retval = class_register(&oled_class);
+ if (retval) {
+ pr_err("Error registering " ASUS_OLED_UNDERSCORE_NAME " class\n");
+ return retval;
}
- retval = class_create_file(oled_class, &class_attr_version.attr);
+ retval = class_create_file(&oled_class, &class_attr_version.attr);
if (retval) {
pr_err("Error creating class version file\n");
goto error;
@@ -831,15 +819,15 @@ static int __init asus_oled_init(void)
return retval;
error:
- class_destroy(oled_class);
+ class_unregister(&oled_class);
return retval;
}
static void __exit asus_oled_exit(void)
{
usb_deregister(&oled_driver);
- class_remove_file(oled_class, &class_attr_version.attr);
- class_destroy(oled_class);
+ class_remove_file(&oled_class, &class_attr_version.attr);
+ class_unregister(&oled_class);
}
module_init(asus_oled_init);
--
1.7.9.7
--
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