From: Borislav Petkov <[email protected]>
Not-Signed-off-by: Borislav Petkov <[email protected]>
---
drivers/base/core.c | 36 ++++++++++++++++++++++++++++++++++++
include/linux/device.h | 9 +++++++++
2 files changed, 45 insertions(+)
diff --git a/drivers/base/core.c b/drivers/base/core.c
index abea76c36a4b..3946a6fbe7bf 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -171,6 +171,42 @@ ssize_t device_show_int(struct device *dev,
}
EXPORT_SYMBOL_GPL(device_show_int);
+/*
+ * ->var is the bitvector and ->aux is the bit number
+ */
+ssize_t device_store_bit(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ struct dev_ext_attribute *ea = to_ext_attr(attr);
+ u64 *bvec = (u64 *)ea->var;
+ u8 val, bit = ea->aux;
+
+ if (kstrtou8(buf, 10, &val) < 0)
+ return -EINVAL;
+
+ if (val > 63)
+ return -EINVAL;
+
+ if (val)
+ *bvec |= BIT_64(bit);
+ else
+ *bvec &= ~BIT_64(bit);
+
+ return size;
+}
+EXPORT_SYMBOL_GPL(device_store_bit);
+
+ssize_t device_show_bit(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct dev_ext_attribute *ea = to_ext_attr(attr);
+ u64 *bvec = (u64 *)ea->var;
+ u8 bit = ea->aux;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", !!(*bvec & BIT_64(bit)));
+}
+EXPORT_SYMBOL_GPL(device_show_bit);
+
/**
* device_release - free device structure.
* @kobj: device's kobject.
diff --git a/include/linux/device.h b/include/linux/device.h
index 86ef6ab553b1..78ade603875f 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -486,6 +486,7 @@ struct device_attribute {
struct dev_ext_attribute {
struct device_attribute attr;
void *var;
+ u8 aux;
};
ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
@@ -496,6 +497,10 @@ 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_bit(struct device *dev, struct device_attribute *attr,
+ char *buf);
+ssize_t device_store_bit(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 +510,10 @@ 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_BIT_ATTR(_name, _mode, _bitvec, _bit) \
+ struct dev_ext_attribute dev_attr_##_name = \
+ { __ATTR(_name, _mode, device_show_bit, device_store_bit), \
+ &(_bitvec), (_bit) }
#define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
struct device_attribute dev_attr_##_name = \
__ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
--
1.8.0.rc0.18.gf84667d
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