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driver core: device.h: add some missing kerneldocs 

struct device_attribute, struct dev_ext_attribute, dev_name(), and the
DEVICE_ATTR() macros lack kerneldocs, preventing them from appearing in
the driver core documentation and from being cross-referenced elsewhere.

Add the missing kerneldocs (except for DEVICE_ATTR_IGNORE_LOCKDEP(),
which is only meaningful on debug builds with CONFIG_DEBUG_LOCK_ALLOC
defined, and is aliased to DEVICE_ATTR() otherwise).

Tested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: James Seo <james@equiv.tech>
Link: https://lore.kernel.org/r/20230509024702.1977991-1-james@equiv.tech
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
James Seo 2023-05-08 19:47:05 -07:00 committed by Greg Kroah-Hartman
parent 30480b988f
commit cd00bc2ca4
1 changed files with 110 additions and 1 deletions
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111
include/linux/device.h
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@ -96,7 +96,12 @@ struct device_type {
const struct dev_pm_ops *pm;
};
/* interface for exporting device attributes */
/**
* struct device_attribute - Interface for exporting device attributes.
* @attr: sysfs attribute definition.
* @show: Show handler.
* @store: Store handler.
*/
struct device_attribute {
struct attribute attr;
ssize_t (*show)(struct device *dev, struct device_attribute *attr,
@ -105,6 +110,11 @@ struct device_attribute {
const char *buf, size_t count);
};
/**
* struct dev_ext_attribute - Exported device attribute with extra context.
* @attr: Exported device attribute.
* @var: Pointer to context.
*/
struct dev_ext_attribute {
struct device_attribute attr;
void *var;
@ -123,30 +133,124 @@ ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count);
/**
* DEVICE_ATTR - Define a device attribute.
* @_name: Attribute name.
* @_mode: File mode.
* @_show: Show handler. Optional, but mandatory if attribute is readable.
* @_store: Store handler. Optional, but mandatory if attribute is writable.
*
* Convenience macro for defining a struct device_attribute.
*
* For example, ``DEVICE_ATTR(foo, 0644, foo_show, foo_store);`` expands to:
*
* .. code-block:: c
*
* struct device_attribute dev_attr_foo = {
* .attr = { .name = "foo", .mode = 0644 },
* .show = foo_show,
* .store = foo_store,
* };
*/
#define DEVICE_ATTR(_name, _mode, _show, _store) \
struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
/**
* DEVICE_ATTR_PREALLOC - Define a preallocated device attribute.
* @_name: Attribute name.
* @_mode: File mode.
* @_show: Show handler. Optional, but mandatory if attribute is readable.
* @_store: Store handler. Optional, but mandatory if attribute is writable.
*
* Like DEVICE_ATTR(), but ``SYSFS_PREALLOC`` is set on @_mode.
*/
#define DEVICE_ATTR_PREALLOC(_name, _mode, _show, _store) \
struct device_attribute dev_attr_##_name = \
__ATTR_PREALLOC(_name, _mode, _show, _store)
/**
* DEVICE_ATTR_RW - Define a read-write device attribute.
* @_name: Attribute name.
*
* Like DEVICE_ATTR(), but @_mode is 0644, @_show is <_name>_show,
* and @_store is <_name>_store.
*/
#define DEVICE_ATTR_RW(_name) \
struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
/**
* DEVICE_ATTR_ADMIN_RW - Define an admin-only read-write device attribute.
* @_name: Attribute name.
*
* 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)
/**
* DEVICE_ATTR_RO - Define a readable device attribute.
* @_name: Attribute name.
*
* 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)
/**
* DEVICE_ATTR_ADMIN_RO - Define an admin-only readable device attribute.
* @_name: Attribute name.
*
* 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)
/**
* DEVICE_ATTR_WO - Define an admin-only writable device attribute.
* @_name: Attribute name.
*
* 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)
/**
* DEVICE_ULONG_ATTR - Define a device attribute backed by an unsigned long.
* @_name: Attribute name.
* @_mode: File mode.
* @_var: Identifier of unsigned long.
*
* Like DEVICE_ATTR(), but @_show and @_store are automatically provided
* such that reads and writes to the attribute from userspace affect @_var.
*/
#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_INT_ATTR - Define a device attribute backed by an int.
* @_name: Attribute name.
* @_mode: File mode.
* @_var: Identifier of int.
*
* Like DEVICE_ULONG_ATTR(), but @_var is an int.
*/
#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_BOOL_ATTR - Define a device attribute backed by a bool.
* @_name: Attribute name.
* @_mode: File mode.
* @_var: Identifier of bool.
*
* Like DEVICE_ULONG_ATTR(), but @_var is a bool.
*/
#define DEVICE_BOOL_ATTR(_name, _mode, _var) \
struct dev_ext_attribute dev_attr_##_name = \
{ __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
#define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
struct device_attribute dev_attr_##_name = \
__ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
@ -711,6 +815,11 @@ static inline bool device_iommu_mapped(struct device *dev)
/* Get the wakeup routines, which depend on struct device */
#include <linux/pm_wakeup.h>
/**
* dev_name - Return a device's name.
* @dev: Device with name to get.
* Return: The kobject name of the device, or its initial name if unavailable.
*/
static inline const char *dev_name(const struct device *dev)
{
/* Use the init name until the kobject becomes available */