[PATCH 1/2 v2] [OF] Add of_device_is_available function
From: Josh Boyer <hidden>
Date: 2008-03-01 14:18:09
IEEE 1275 defined a standard "status" property to indicate the operational status of a device. The property has four possible values: okay, disabled, fail, fail-xxx. The absence of this property means the operational status of the device is unknown or okay. This adds a function called of_device_is_available that checks the state of the status property of a device. If the property is absent or set to either "okay" or "ok", it returns 1. Otherwise it returns 0. Signed-off-by: Josh Boyer <redacted> --- drivers/of/base.c | 26 ++++++++++++++++++++++++++ include/linux/of.h | 1 + 2 files changed, 27 insertions(+)
--- linux-2.6.orig/drivers/of/base.c
+++ linux-2.6/drivers/of/base.c@@ -117,6 +117,32 @@ int of_device_is_compatible(const struct EXPORT_SYMBOL(of_device_is_compatible); /** + * of_device_is_available - check if a device is available for use + * + * @device: Node to check for availability + * + * Returns 1 if the status property is absent or set to "okay" or
"ok",
+ * 0 otherwise
+ */
+int of_device_is_available(const struct device_node *device)
+{
+ const char *status;
+ int statlen;
+
+ status = of_get_property(device, "status", &statlen);
+ if (status == NULL)
+ return 1;
+
+ if (statlen > 0) {
+ if (!strncmp(status, "okay", 4) || !strncmp(status,
"ok", 2))
+ return 1;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(of_device_is_available);
+
+/**
* of_get_parent - Get a node's parent if any
* @node: Node to get parent
*--- linux-2.6.orig/include/linux/of.h
+++ linux-2.6/include/linux/of.h@@ -62,6 +62,7 @@ extern struct property *of_find_property int *lenp); extern int of_device_is_compatible(const struct device_node *device, const char *); +extern int of_device_is_available(const struct device_node *device); extern const void *of_get_property(const struct device_node *node, const char *name, int *lenp);