diff options
| author | Josh Boyer <jwboyer@linux.vnet.ibm.com> | 2008-03-27 00:33:14 +1100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-04-07 13:49:23 +1000 |
| commit | 834d97d452208279edf11c57eca150360d2dd1d6 (patch) | |
| tree | 9e5de1e017165c6d20a154313c8b97f315b8c59a /drivers/of | |
| parent | 6ccf61f94fbac3e8715f2f938b27cdb3836c1f8c (diff) | |
[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>
Diffstat (limited to 'drivers/of')
| -rw-r--r-- | drivers/of/base.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index 80c9deca5f35..9bd7c4a31253 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 * |