---

yaml --- r: 104784 b: refs/heads/master c: 9800794 h: refs/heads/master v: v3
git-mirror · Jul 22, 2008 · df14d85 · df14d85
1 parent 187e66e
commit df14d85
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Showing 3 changed files with 84 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 4a0b2b4dbe1335b8b9886ba3dc85a145d5d938ed
+refs/heads/master: 9800794ac11d4646384b3a310dfd1fe2eed577bf
diff --git a/trunk/drivers/base/sys.c b/trunk/drivers/base/sys.c
@@ -479,3 +479,52 @@ int __init system_bus_init(void)
 
 EXPORT_SYMBOL_GPL(sysdev_register);
 EXPORT_SYMBOL_GPL(sysdev_unregister);
+
+#define to_ext_attr(x) container_of(x, struct sysdev_ext_attribute, attr)
+
+ssize_t sysdev_store_ulong(struct sys_device *sysdev,
+			   struct sysdev_attribute *attr,
+			   const char *buf, size_t size)
+{
+	struct sysdev_ext_attribute *ea = to_ext_attr(attr);
+	char *end;
+	unsigned long new = simple_strtoul(buf, &end, 0);
+	if (end == buf)
+		return -EINVAL;
+	*(unsigned long *)(ea->var) = new;
+	return end - buf;
+}
+EXPORT_SYMBOL_GPL(sysdev_store_ulong);
+
+ssize_t sysdev_show_ulong(struct sys_device *sysdev,
+			  struct sysdev_attribute *attr,
+			  char *buf)
+{
+	struct sysdev_ext_attribute *ea = to_ext_attr(attr);
+	return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var));
+}
+EXPORT_SYMBOL_GPL(sysdev_show_ulong);
+
+ssize_t sysdev_store_int(struct sys_device *sysdev,
+			   struct sysdev_attribute *attr,
+			   const char *buf, size_t size)
+{
+	struct sysdev_ext_attribute *ea = to_ext_attr(attr);
+	char *end;
+	long new = simple_strtol(buf, &end, 0);
+	if (end == buf || new > INT_MAX || new < INT_MIN)
+		return -EINVAL;
+	*(int *)(ea->var) = new;
+	return end - buf;
+}
+EXPORT_SYMBOL_GPL(sysdev_store_int);
+
+ssize_t sysdev_show_int(struct sys_device *sysdev,
+			  struct sysdev_attribute *attr,
+			  char *buf)
+{
+	struct sysdev_ext_attribute *ea = to_ext_attr(attr);
+	return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var));
+}
+EXPORT_SYMBOL_GPL(sysdev_show_int);
+
diff --git a/trunk/include/linux/sysdev.h b/trunk/include/linux/sysdev.h
@@ -119,4 +119,38 @@ struct sysdev_attribute {
 extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *);
 extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *);
 
+struct sysdev_ext_attribute {
+	struct sysdev_attribute attr;
+	void *var;
+};
+
+/*
+ * Support for simple variable sysdev attributes.
+ * The pointer to the variable is stored in a sysdev_ext_attribute
+ */
+
+/* Add more types as needed */
+
+extern ssize_t sysdev_show_ulong(struct sys_device *, struct sysdev_attribute *,
+				char *);
+extern ssize_t sysdev_store_ulong(struct sys_device *,
+			struct sysdev_attribute *, const char *, size_t);
+extern ssize_t sysdev_show_int(struct sys_device *, struct sysdev_attribute *,
+				char *);
+extern ssize_t sysdev_store_int(struct sys_device *,
+			struct sysdev_attribute *, const char *, size_t);
+
+#define _SYSDEV_ULONG_ATTR(_name, _mode, _var)				\
+	{ _SYSDEV_ATTR(_name, _mode, sysdev_show_ulong, sysdev_store_ulong), \
+	  &(_var) }
+#define SYSDEV_ULONG_ATTR(_name, _mode, _var)			\
+	struct sysdev_ext_attribute attr_##_name = 		\
+		_SYSDEV_ULONG_ATTR(_name, _mode, _var);
+#define _SYSDEV_INT_ATTR(_name, _mode, _var)				\
+	{ _SYSDEV_ATTR(_name, _mode, sysdev_show_int, sysdev_store_int), \
+	  &(_var) }
+#define SYSDEV_INT_ATTR(_name, _mode, _var)			\
+	struct sysdev_ext_attribute attr_##_name = 		\
+		_SYSDEV_INT_ATTR(_name, _mode, _var);
+
 #endif /* _SYSDEV_H_ */