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authorJosh Boyer <jwboyer@linux.vnet.ibm.com>2008-03-27 00:33:14 +1100
committerPaul Mackerras <paulus@samba.org>2008-04-07 13:49:23 +1000
commit834d97d452208279edf11c57eca150360d2dd1d6 (patch)
tree9e5de1e017165c6d20a154313c8b97f315b8c59a
parent6ccf61f94fbac3e8715f2f938b27cdb3836c1f8c (diff)
downloadop-kernel-dev-834d97d452208279edf11c57eca150360d2dd1d6.zip
op-kernel-dev-834d97d452208279edf11c57eca150360d2dd1d6.tar.gz
[POWERPC] Add of_device_is_available function
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 <jwboyer@linux.vnet.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
-rw-r--r--drivers/of/base.c26
-rw-r--r--include/linux/of.h1
2 files changed, 27 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 80c9dec..9bd7c4a 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -117,6 +117,32 @@ int of_device_is_compatible(const struct device_node *device,
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 (!strcmp(status, "okay") || !strcmp(status, "ok"))
+ 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
*
diff --git a/include/linux/of.h b/include/linux/of.h
index 6981016..59a61bd 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -62,6 +62,7 @@ extern struct property *of_find_property(const struct device_node *np,
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);
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