[PATCH] HID: vivaldi: convert to use dev_groups

[PATCH] HID: vivaldi: convert to use dev_groups

[Greg Kroah-Hartman]

There is no need for a driver to individually add/create device groups,
the driver core will do it automatically for you.  Convert the
hid-vivaldi core driver to use the dev_groups pointer instead of
manually calling the driver core to create the group and have it be
cleaned up later on by the devm core.

Cc: Jiri Kosina <jikos@kernel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: linux-input@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/hid/hid-google-hammer.c  |  4 +++-
 drivers/hid/hid-vivaldi-common.c | 29 +++++++++++++++--------------
 drivers/hid/hid-vivaldi-common.h |  4 +---
 drivers/hid/hid-vivaldi.c        |  4 +++-
 4 files changed, 22 insertions(+), 19 deletions(-)

diff --git a/drivers/hid/hid-google-hammer.c b/drivers/hid/hid-google-hammer.c
index ff40f1e55c21..7ae5f27df54d 100644
--- a/drivers/hid/hid-google-hammer.c
+++ b/drivers/hid/hid-google-hammer.c
@@ -608,9 +608,11 @@ static struct hid_driver hammer_driver = {
 	.probe = hammer_probe,
 	.remove = hammer_remove,
 	.feature_mapping = vivaldi_feature_mapping,
-	.input_configured = vivaldi_input_configured,
 	.input_mapping = hammer_input_mapping,
 	.event = hammer_event,
+	.driver = {
+		.dev_groups = vivaldi_attribute_groups,
+	},
 };
 
 static int __init hammer_init(void)
diff --git a/drivers/hid/hid-vivaldi-common.c b/drivers/hid/hid-vivaldi-common.c
index 8b3e515d0f06..b0af2be94895 100644
--- a/drivers/hid/hid-vivaldi-common.c
+++ b/drivers/hid/hid-vivaldi-common.c
@@ -116,25 +116,26 @@ static struct attribute *vivaldi_sysfs_attrs[] = {
 	NULL
 };
 
-static const struct attribute_group vivaldi_attribute_group = {
-	.attrs = vivaldi_sysfs_attrs,
-};
-
-/**
- * vivaldi_input_configured - Complete initialization of device using vivaldi map
- * @hdev: HID device to which vivaldi attributes should be attached
- * @hidinput: HID input device (unused)
- */
-int vivaldi_input_configured(struct hid_device *hdev,
-			     struct hid_input *hidinput)
+static umode_t vivaldi_is_visible(struct kobject *kobj, struct attribute *attr,
+				  int n)
 {
+	struct hid_device *hdev = to_hid_device(kobj_to_dev(kobj));
 	struct vivaldi_data *data = hid_get_drvdata(hdev);
 
 	if (!data->num_function_row_keys)
 		return 0;
-
-	return devm_device_add_group(&hdev->dev, &vivaldi_attribute_group);
+	return attr->mode;
 }
-EXPORT_SYMBOL_GPL(vivaldi_input_configured);
+
+static const struct attribute_group vivaldi_attribute_group = {
+	.attrs = vivaldi_sysfs_attrs,
+	.is_visible = vivaldi_is_visible,
+};
+
+const struct attribute_group *vivaldi_attribute_groups[] = {
+	&vivaldi_attribute_group,
+	NULL,
+};
+EXPORT_SYMBOL_GPL(vivaldi_attribute_groups);
 
 MODULE_LICENSE("GPL");
diff --git a/drivers/hid/hid-vivaldi-common.h b/drivers/hid/hid-vivaldi-common.h
index d42e82d77825..ba9adfa08a2d 100644
--- a/drivers/hid/hid-vivaldi-common.h
+++ b/drivers/hid/hid-vivaldi-common.h
@@ -4,13 +4,11 @@
 
 struct hid_device;
 struct hid_field;
-struct hid_input;
 struct hid_usage;
 
 void vivaldi_feature_mapping(struct hid_device *hdev,
 			     struct hid_field *field, struct hid_usage *usage);
 
-int vivaldi_input_configured(struct hid_device *hdev,
-			     struct hid_input *hidinput);
+extern const struct attribute_group *vivaldi_attribute_groups[];
 
 #endif /* _HID_VIVALDI_COMMON_H */
diff --git a/drivers/hid/hid-vivaldi.c b/drivers/hid/hid-vivaldi.c
index 3a979123e7d3..cda5938fb070 100644
--- a/drivers/hid/hid-vivaldi.c
+++ b/drivers/hid/hid-vivaldi.c
@@ -45,7 +45,9 @@ static struct hid_driver hid_vivaldi = {
 	.id_table = vivaldi_table,
 	.probe = vivaldi_probe,
 	.feature_mapping = vivaldi_feature_mapping,
-	.input_configured = vivaldi_input_configured,
+	.driver = {
+		.dev_groups = vivaldi_attribute_groups,
+	},
 };
 
 module_hid_driver(hid_vivaldi);
-- 
2.37.1

Re: [PATCH] HID: vivaldi: convert to use dev_groups

[Jiri Kosina]

On Thu, 4 Aug 2022, Greg Kroah-Hartman wrote:

> There is no need for a driver to individually add/create device groups,
> the driver core will do it automatically for you.  Convert the
> hid-vivaldi core driver to use the dev_groups pointer instead of
> manually calling the driver core to create the group and have it be
> cleaned up later on by the devm core.
> 
> Cc: Jiri Kosina <jikos@kernel.org>
> Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
> Cc: linux-input@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Applied, thanks Greg.

-- 
Jiri Kosina
SUSE Labs