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Message-Id: <20240613-acpi-sysfs-groups-v1-3-665e0deb052a@weissschuh.net>
Date: Thu, 13 Jun 2024 22:15:34 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
Robert Moore <robert.moore@...el.com>
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
acpica-devel@...ts.linux.dev,
Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 3/5] ACPI: sysfs: manage attributes as attribute_group
The current manual attribute management is inconsistent and brittle.
Not all return values of device_create_file() are checked and the
cleanup logic needs to be kept up to date manually.
Moving all attributes into an attribute_group and using the is_visible()
callback allows the management of all attributes as a single unit.
Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
drivers/acpi/device_sysfs.c | 190 ++++++++++++++++++++------------------------
1 file changed, 84 insertions(+), 106 deletions(-)
diff --git a/drivers/acpi/device_sysfs.c b/drivers/acpi/device_sysfs.c
index d0ca159d93e1..a673488066b3 100644
--- a/drivers/acpi/device_sysfs.c
+++ b/drivers/acpi/device_sysfs.c
@@ -494,6 +494,88 @@ static ssize_t status_show(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RO(status);
+static struct attribute *acpi_attrs[] = {
+ &dev_attr_path.attr,
+ &dev_attr_hid.attr,
+ &dev_attr_modalias.attr,
+ &dev_attr_description.attr,
+ &dev_attr_adr.attr,
+ &dev_attr_uid.attr,
+ &dev_attr_sun.attr,
+ &dev_attr_hrv.attr,
+ &dev_attr_status.attr,
+ &dev_attr_eject.attr,
+ &dev_attr_power_state.attr,
+ &dev_attr_real_power_state.attr,
+ NULL
+};
+
+static bool acpi_show_attr(struct acpi_device *dev, const struct device_attribute *attr)
+{
+ /*
+ * Devices gotten from FADT don't have a "path" attribute
+ */
+ if (attr == &dev_attr_path)
+ return dev->handle;
+
+ if (attr == &dev_attr_hid || attr == &dev_attr_modalias)
+ return !list_empty(&dev->pnp.ids);
+
+ /*
+ * If device has _STR, 'description' file is created
+ */
+ if (attr == &dev_attr_description)
+ return dev->pnp.str;
+
+ if (attr == &dev_attr_adr)
+ return dev->pnp.type.bus_address;
+
+ if (attr == &dev_attr_uid)
+ return acpi_device_uid(dev);
+
+ if (attr == &dev_attr_sun)
+ return acpi_has_method(dev->handle, "_SUN");
+
+ if (attr == &dev_attr_hrv)
+ return acpi_has_method(dev->handle, "_HRV");
+
+ if (attr == &dev_attr_status)
+ return acpi_has_method(dev->handle, "_STA");
+
+ /*
+ * If device has _EJ0, 'eject' file is created that is used to trigger
+ * hot-removal function from userland.
+ */
+ if (attr == &dev_attr_eject)
+ return acpi_has_method(dev->handle, "_EJ0");
+
+ if (attr == &dev_attr_power_state)
+ return dev->flags.power_manageable;
+
+ if (attr == &dev_attr_real_power_state)
+ return dev->flags.power_manageable && dev->power.flags.power_resources;
+
+ dev_warn_once(&dev->dev, "Unexpected attribute: %s\n", attr->attr.name);
+ return false;
+}
+
+static umode_t acpi_attr_is_visible(struct kobject *kobj,
+ struct attribute *attr,
+ int attrno)
+{
+ struct acpi_device *dev = to_acpi_device(kobj_to_dev(kobj));
+
+ if (acpi_show_attr(dev, container_of(attr, struct device_attribute, attr)))
+ return attr->mode;
+ else
+ return 0;
+}
+
+static const struct attribute_group acpi_group = {
+ .attrs = acpi_attrs,
+ .is_visible = acpi_attr_is_visible,
+};
+
static const char *devm_acpi_device_str(struct acpi_device *dev)
{
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
@@ -536,81 +618,11 @@ int acpi_device_setup_files(struct acpi_device *dev)
{
int result = 0;
- /*
- * Devices gotten from FADT don't have a "path" attribute
- */
- if (dev->handle) {
- result = device_create_file(&dev->dev, &dev_attr_path);
- if (result)
- goto end;
- }
-
- if (!list_empty(&dev->pnp.ids)) {
- result = device_create_file(&dev->dev, &dev_attr_hid);
- if (result)
- goto end;
-
- result = device_create_file(&dev->dev, &dev_attr_modalias);
- if (result)
- goto end;
- }
-
- /*
- * If device has _STR, 'description' file is created
- */
dev->pnp.str = devm_acpi_device_str(dev);
- if (dev->pnp.str) {
- result = device_create_file(&dev->dev, &dev_attr_description);
- if (result)
- goto end;
- }
-
- if (dev->pnp.type.bus_address)
- result = device_create_file(&dev->dev, &dev_attr_adr);
- if (acpi_device_uid(dev))
- result = device_create_file(&dev->dev, &dev_attr_uid);
-
- if (acpi_has_method(dev->handle, "_SUN")) {
- result = device_create_file(&dev->dev, &dev_attr_sun);
- if (result)
- goto end;
- }
-
- if (acpi_has_method(dev->handle, "_HRV")) {
- result = device_create_file(&dev->dev, &dev_attr_hrv);
- if (result)
- goto end;
- }
-
- if (acpi_has_method(dev->handle, "_STA")) {
- result = device_create_file(&dev->dev, &dev_attr_status);
- if (result)
- goto end;
- }
-
- /*
- * If device has _EJ0, 'eject' file is created that is used to trigger
- * hot-removal function from userland.
- */
- if (acpi_has_method(dev->handle, "_EJ0")) {
- result = device_create_file(&dev->dev, &dev_attr_eject);
- if (result)
- return result;
- }
-
- if (dev->flags.power_manageable) {
- result = device_create_file(&dev->dev, &dev_attr_power_state);
- if (result)
- return result;
-
- if (dev->power.flags.power_resources)
- result = device_create_file(&dev->dev,
- &dev_attr_real_power_state);
- }
+ result = device_add_group(&dev->dev, &acpi_group);
acpi_expose_nondev_subnodes(&dev->dev.kobj, &dev->data);
-end:
return result;
}
@@ -621,39 +633,5 @@ int acpi_device_setup_files(struct acpi_device *dev)
void acpi_device_remove_files(struct acpi_device *dev)
{
acpi_hide_nondev_subnodes(&dev->data);
-
- if (dev->flags.power_manageable) {
- device_remove_file(&dev->dev, &dev_attr_power_state);
- if (dev->power.flags.power_resources)
- device_remove_file(&dev->dev,
- &dev_attr_real_power_state);
- }
-
- /*
- * If device has _STR, remove 'description' file
- */
- if (acpi_has_method(dev->handle, "_STR"))
- device_remove_file(&dev->dev, &dev_attr_description);
- /*
- * If device has _EJ0, remove 'eject' file.
- */
- if (acpi_has_method(dev->handle, "_EJ0"))
- device_remove_file(&dev->dev, &dev_attr_eject);
-
- if (acpi_has_method(dev->handle, "_SUN"))
- device_remove_file(&dev->dev, &dev_attr_sun);
-
- if (acpi_has_method(dev->handle, "_HRV"))
- device_remove_file(&dev->dev, &dev_attr_hrv);
-
- if (acpi_device_uid(dev))
- device_remove_file(&dev->dev, &dev_attr_uid);
- if (dev->pnp.type.bus_address)
- device_remove_file(&dev->dev, &dev_attr_adr);
- device_remove_file(&dev->dev, &dev_attr_modalias);
- device_remove_file(&dev->dev, &dev_attr_hid);
- if (acpi_has_method(dev->handle, "_STA"))
- device_remove_file(&dev->dev, &dev_attr_status);
- if (dev->handle)
- device_remove_file(&dev->dev, &dev_attr_path);
+ device_remove_group(&dev->dev, &acpi_group);
}
--
2.45.2
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