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: Borislav Petkov <bp@alien8.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Tony Luck <tony.luck@intel.com>

2 files changed, 28 insertions, 0 deletions

diff --git a/drivers/base/core.c b/drivers/base/core.c
index abea76c36a4b..c8ae1f6b01b9 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -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.
diff --git a/include/linux/device.h b/include/linux/device.h
index 86ef6ab553b1..50c85a26b003 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -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)