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path: root/drivers/s390/cio/ccwgroup.c
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Diffstat (limited to 'drivers/s390/cio/ccwgroup.c')
-rw-r--r--drivers/s390/cio/ccwgroup.c67
1 files changed, 50 insertions, 17 deletions
diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
index b0a18f5..9c3b9ea 100644
--- a/drivers/s390/cio/ccwgroup.c
+++ b/drivers/s390/cio/ccwgroup.c
@@ -152,16 +152,24 @@ __ccwgroup_create_symlinks(struct ccwgroup_device *gdev)
return 0;
}
-/*
- * try to add a new ccwgroup device for one driver
- * argc and argv[] are a list of bus_id's of devices
- * belonging to the driver.
+/**
+ * ccwgroup_create() - create and register a ccw group device
+ * @root: parent device for the new device
+ * @creator_id: identifier of creating driver
+ * @cdrv: ccw driver of slave devices
+ * @argc: number of slave devices
+ * @argv: bus ids of slave devices
+ *
+ * Create and register a new ccw group device as a child of @root. Slave
+ * devices are obtained from the list of bus ids given in @argv[] and must all
+ * belong to @cdrv.
+ * Returns:
+ * %0 on success and an error code on failure.
+ * Context:
+ * non-atomic
*/
-int
-ccwgroup_create(struct device *root,
- unsigned int creator_id,
- struct ccw_driver *cdrv,
- int argc, char *argv[])
+int ccwgroup_create(struct device *root, unsigned int creator_id,
+ struct ccw_driver *cdrv, int argc, char *argv[])
{
struct ccwgroup_device *gdev;
int i;
@@ -390,8 +398,13 @@ static struct bus_type ccwgroup_bus_type = {
.remove = ccwgroup_remove,
};
-int
-ccwgroup_driver_register (struct ccwgroup_driver *cdriver)
+/**
+ * ccwgroup_driver_register() - register a ccw group driver
+ * @cdriver: driver to be registered
+ *
+ * This function is mainly a wrapper around driver_register().
+ */
+int ccwgroup_driver_register(struct ccwgroup_driver *cdriver)
{
/* register our new driver with the core */
cdriver->driver.bus = &ccwgroup_bus_type;
@@ -406,8 +419,13 @@ __ccwgroup_match_all(struct device *dev, void *data)
return 1;
}
-void
-ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver)
+/**
+ * ccwgroup_driver_unregister() - deregister a ccw group driver
+ * @cdriver: driver to be deregistered
+ *
+ * This function is mainly a wrapper around driver_unregister().
+ */
+void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver)
{
struct device *dev;
@@ -427,8 +445,16 @@ ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver)
driver_unregister(&cdriver->driver);
}
-int
-ccwgroup_probe_ccwdev(struct ccw_device *cdev)
+/**
+ * ccwgroup_probe_ccwdev() - probe function for slave devices
+ * @cdev: ccw device to be probed
+ *
+ * This is a dummy probe function for ccw devices that are slave devices in
+ * a ccw group device.
+ * Returns:
+ * always %0
+ */
+int ccwgroup_probe_ccwdev(struct ccw_device *cdev)
{
return 0;
}
@@ -452,8 +478,15 @@ __ccwgroup_get_gdev_by_cdev(struct ccw_device *cdev)
return NULL;
}
-void
-ccwgroup_remove_ccwdev(struct ccw_device *cdev)
+/**
+ * ccwgroup_remove_ccwdev() - remove function for slave devices
+ * @cdev: ccw device to be removed
+ *
+ * This is a remove function for ccw devices that are slave devices in a ccw
+ * group device. It sets the ccw device offline and also deregisters the
+ * embedding ccw group device.
+ */
+void ccwgroup_remove_ccwdev(struct ccw_device *cdev)
{
struct ccwgroup_device *gdev;