[PATCH 145/196] driver core: Introduce default attribute groups.

Greg Kroah-Hartman
2008-01-25T08:37:15Z

From: Cornelia Huck <cornelia.huck@de.ibm.com>

This is lot like default attributes for devices (and indeed,
a lot of the code is lifted from there).

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/base/driver.c | 42 +++++++++++++++++++++++++++++++++++++++++-
include/linux/device.h | 1 +
2 files changed, 42 insertions(+), 1 deletions(-)

diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index f94be40..e3b5840 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -142,6 +142,37 @@ void put_driver(struct device_driver * drv)
kobject_put(&drv->kobj);
}

+static int driver_add_groups(struct device_driver *drv,
+ struct attribute_group **groups)
+{
+ int error = 0;
+ int i;
+
+ if (groups) {
+ for (i = 0; groups[i]; i++) {
+ error = sysfs_create_group(&drv->kobj, groups[i]);
+ if (error) {
+ while (--i >= 0)
+ sysfs_remove_group(&drv->kobj,
+ groups[i]);
+ break;
+ }
+ }
+ }
+ return error;
+}
+
+static void driver_remove_groups(struct device_driver *drv,
+ struct attribute_group **groups)
+{
+ int i;
+
+ if (groups)
+ for (i = 0; groups[i]; i++)
+ sysfs_remove_group(&drv->kobj, groups[i]);
+}
+
+
/**
* driver_register - register driver with bus
* @drv: driver to register
@@ -152,13 +183,21 @@ void put_driver(struct device_driver * drv)
*/
int driver_register(struct device_driver * drv)
{
+ int ret;
+
if ((drv->bus->probe && drv->probe) ||
(drv->bus->remove && drv->remove) ||
(drv->bus->shutdown && drv->shutdown)) {
printk(KERN_WARNING "Driver '%s' needs updating - please use bus_type methods\n", drv->name);
}
klist_init(&drv->klist_devices, NULL, NULL);
- return bus_add_driver(drv);
+ ret = bus_add_driver(drv);
+ if (ret)
+ return ret;
+ ret = driver_add_groups(drv, drv->groups);
+ if (ret)
+ bus_remove_driver(drv);
+ return ret;
}

/**
@@ -170,6 +209,7 @@ int driver_register(struct device_driver * drv)

void driver_unregister(struct device_driver * drv)
{
+ driver_remove_groups(drv, drv->groups);
bus_remove_driver(drv);
}

diff --git a/include/linux/device.h b/include/linux/device.h
index 3f24bf4..d974dda 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -129,6 +129,7 @@ struct device_driver {
void (*shutdown) (struct device * dev);
int (*suspend) (struct device * dev, pm_message_t state);
int (*resume) (struct device * dev);
+ struct attribute_group **groups;
};

--
1.5.3.8