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Commit 91872392 authored by Borislav Petkov's avatar Borislav Petkov
Browse files

drivers/base: Add a DEVICE_BOOL_ATTR macro 



... which, analogous to DEVICE_INT_ATTR provides functionality to
set/clear bools. Its purpose is to be used where values need to be used
as booleans in configuration context.

Next patch uses this.

Signed-off-by: default avatarBorislav Petkov <bp@alien8.de>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: default avatarTony Luck <tony.luck@intel.com>
parent 6f0c0580

drivers/base/core.c

+21 −0
Original line number Diff line number Diff line
@@ -171,6 +171,27 @@ ssize_t device_show_int(struct device *dev, 
}

EXPORT_SYMBOL_GPL(device_show_int);



ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,

			  const char *buf, size_t size)

{

	struct dev_ext_attribute *ea = to_ext_attr(attr);



	if (strtobool(buf, ea->var) < 0)

		return -EINVAL;



	return size;

}

EXPORT_SYMBOL_GPL(device_store_bool);



ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,

			 char *buf)

{

	struct dev_ext_attribute *ea = to_ext_attr(attr);



	return snprintf(buf, PAGE_SIZE, "%d\n", *(bool *)(ea->var));

}

EXPORT_SYMBOL_GPL(device_show_bool);



/**

 *	device_release - free device structure.

 *	@kobj:	device's kobject.

include/linux/device.h

+7 −0
Original line number Diff line number Diff line
@@ -496,6 +496,10 @@ ssize_t device_show_int(struct device *dev, struct device_attribute *attr, 
			char *buf);

ssize_t device_store_int(struct device *dev, struct device_attribute *attr,

			 const char *buf, size_t count);

ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,

			char *buf);

ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,

			 const char *buf, size_t count);



#define DEVICE_ATTR(_name, _mode, _show, _store) \

	struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
@@ -505,6 +509,9 @@ ssize_t device_store_int(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) }

#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)