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driver core: Add low-level macros for device attributes

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For the upcoming constification of device attributes the generic
__ATTR() macros are insufficient.

Prepare for a split by introducing new low-level macros specific to
device attributes.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://patch.msgid.link/20260512-sysfs-const-attr-device_attr-prep-v3-2-cb7c17b34d52@weissschuh.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Weißschuh 2026-05-12 18:39:12 +02:00 committed by Greg Kroah-Hartman
parent cdd4c98d5a
commit 56e733f78c
1 changed files with 32 additions and 11 deletions
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43
include/linux/device.h
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@ -134,6 +134,27 @@ ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
ssize_t device_show_string(struct device *dev, struct device_attribute *attr,
char *buf);
#define __DEVICE_ATTR(_name, _mode, _show, _store) \
__ATTR(_name, _mode, _show, _store)
#define __DEVICE_ATTR_RO_MODE(_name, _mode) \
__ATTR_RO_MODE(_name, _mode)
#define __DEVICE_ATTR_RO(_name) \
__ATTR_RO(_name)
#define __DEVICE_ATTR_WO(_name) \
__ATTR_WO(_name)
#define __DEVICE_ATTR_RW_MODE(_name, _mode) \
__ATTR_RW_MODE(_name, _mode)
#define __DEVICE_ATTR_RW(_name) \
__ATTR_RW(_name)
#define __DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
__ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
/**
* DEVICE_ATTR - Define a device attribute.
* @_name: Attribute name.
@ -154,7 +175,7 @@ ssize_t device_show_string(struct device *dev, struct device_attribute *attr,
* };
*/
#define DEVICE_ATTR(_name, _mode, _show, _store) \
struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
struct device_attribute dev_attr_##_name = __DEVICE_ATTR(_name, _mode, _show, _store)
/**
* DEVICE_ATTR_RW - Define a read-write device attribute.
@ -164,7 +185,7 @@ ssize_t device_show_string(struct device *dev, struct device_attribute *attr,
* and @_store is <_name>_store.
*/
#define DEVICE_ATTR_RW(_name) \
struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
struct device_attribute dev_attr_##_name = __DEVICE_ATTR_RW(_name)
/**
* DEVICE_ATTR_ADMIN_RW - Define an admin-only read-write device attribute.
@ -173,7 +194,7 @@ ssize_t device_show_string(struct device *dev, struct device_attribute *attr,
* Like DEVICE_ATTR_RW(), but @_mode is 0600.
*/
#define DEVICE_ATTR_ADMIN_RW(_name) \
struct device_attribute dev_attr_##_name = __ATTR_RW_MODE(_name, 0600)
struct device_attribute dev_attr_##_name = __DEVICE_ATTR_RW_MODE(_name, 0600)
/**
* DEVICE_ATTR_RW_NAMED - Define a read-write device attribute with a sysfs name
@ -198,7 +219,7 @@ ssize_t device_show_string(struct device *dev, struct device_attribute *attr,
* Like DEVICE_ATTR(), but @_mode is 0444 and @_show is <_name>_show.
*/
#define DEVICE_ATTR_RO(_name) \
struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
struct device_attribute dev_attr_##_name = __DEVICE_ATTR_RO(_name)
/**
* DEVICE_ATTR_ADMIN_RO - Define an admin-only readable device attribute.
@ -207,7 +228,7 @@ ssize_t device_show_string(struct device *dev, struct device_attribute *attr,
* Like DEVICE_ATTR_RO(), but @_mode is 0400.
*/
#define DEVICE_ATTR_ADMIN_RO(_name) \
struct device_attribute dev_attr_##_name = __ATTR_RO_MODE(_name, 0400)
struct device_attribute dev_attr_##_name = __DEVICE_ATTR_RO_MODE(_name, 0400)
/**
* DEVICE_ATTR_RO_NAMED - Define a read-only device attribute with a sysfs name
@ -231,7 +252,7 @@ ssize_t device_show_string(struct device *dev, struct device_attribute *attr,
* Like DEVICE_ATTR(), but @_mode is 0200 and @_store is <_name>_store.
*/
#define DEVICE_ATTR_WO(_name) \
struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
struct device_attribute dev_attr_##_name = __DEVICE_ATTR_WO(_name)
/**
* DEVICE_ATTR_WO_NAMED - Define a read-only device attribute with a sysfs name
@ -259,7 +280,7 @@ ssize_t device_show_string(struct device *dev, struct device_attribute *attr,
*/
#define DEVICE_ULONG_ATTR(_name, _mode, _var) \
struct dev_ext_attribute dev_attr_##_name = \
{ __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
{ __DEVICE_ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
/**
* DEVICE_INT_ATTR - Define a device attribute backed by an int.
@ -271,7 +292,7 @@ ssize_t device_show_string(struct device *dev, struct device_attribute *attr,
*/
#define DEVICE_INT_ATTR(_name, _mode, _var) \
struct dev_ext_attribute dev_attr_##_name = \
{ __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
{ __DEVICE_ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
/**
* DEVICE_BOOL_ATTR - Define a device attribute backed by a bool.
@ -283,7 +304,7 @@ ssize_t device_show_string(struct device *dev, struct device_attribute *attr,
*/
#define DEVICE_BOOL_ATTR(_name, _mode, _var) \
struct dev_ext_attribute dev_attr_##_name = \
{ __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
{ __DEVICE_ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
/**
* DEVICE_STRING_ATTR_RO - Define a device attribute backed by a r/o string.
@ -296,11 +317,11 @@ ssize_t device_show_string(struct device *dev, struct device_attribute *attr,
*/
#define DEVICE_STRING_ATTR_RO(_name, _mode, _var) \
struct dev_ext_attribute dev_attr_##_name = \
{ __ATTR(_name, (_mode) & ~0222, device_show_string, NULL), (_var) }
{ __DEVICE_ATTR(_name, (_mode) & ~0222, device_show_string, NULL), (_var) }
#define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
struct device_attribute dev_attr_##_name = \
__ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
__DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
int device_create_file(struct device *device,
const struct device_attribute *entry);