2005-04-16 16:20:36 -06:00
|
|
|
/*
|
|
|
|
* drivers/s390/cio/ccwgroup.c
|
|
|
|
* bus driver for ccwgroup
|
|
|
|
*
|
|
|
|
* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
|
|
|
|
* IBM Corporation
|
|
|
|
* Author(s): Arnd Bergmann (arndb@de.ibm.com)
|
2006-01-14 14:21:04 -07:00
|
|
|
* Cornelia Huck (cornelia.huck@de.ibm.com)
|
2005-04-16 16:20:36 -06:00
|
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/errno.h>
|
|
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/list.h>
|
|
|
|
#include <linux/device.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/ctype.h>
|
|
|
|
#include <linux/dcache.h>
|
|
|
|
|
|
|
|
#include <asm/semaphore.h>
|
|
|
|
#include <asm/ccwdev.h>
|
|
|
|
#include <asm/ccwgroup.h>
|
|
|
|
|
|
|
|
/* In Linux 2.4, we had a channel device layer called "chandev"
|
|
|
|
* that did all sorts of obscure stuff for networking devices.
|
|
|
|
* This is another driver that serves as a replacement for just
|
|
|
|
* one of its functions, namely the translation of single subchannels
|
|
|
|
* to devices that use multiple subchannels.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* a device matches a driver if all its slave devices match the same
|
|
|
|
* entry of the driver */
|
|
|
|
static int
|
|
|
|
ccwgroup_bus_match (struct device * dev, struct device_driver * drv)
|
|
|
|
{
|
|
|
|
struct ccwgroup_device *gdev;
|
|
|
|
struct ccwgroup_driver *gdrv;
|
|
|
|
|
2008-01-26 06:10:38 -07:00
|
|
|
gdev = to_ccwgroupdev(dev);
|
|
|
|
gdrv = to_ccwgroupdrv(drv);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
if (gdev->creator_id == gdrv->driver_id)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static int
|
2007-08-14 07:15:12 -06:00
|
|
|
ccwgroup_uevent (struct device *dev, struct kobj_uevent_env *env)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
/* TODO */
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2006-01-05 07:42:09 -07:00
|
|
|
static struct bus_type ccwgroup_bus_type;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2007-02-05 13:18:53 -07:00
|
|
|
static void
|
2005-04-16 16:20:36 -06:00
|
|
|
__ccwgroup_remove_symlinks(struct ccwgroup_device *gdev)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
char str[8];
|
|
|
|
|
|
|
|
for (i = 0; i < gdev->count; i++) {
|
|
|
|
sprintf(str, "cdev%d", i);
|
|
|
|
sysfs_remove_link(&gdev->dev.kobj, str);
|
|
|
|
sysfs_remove_link(&gdev->cdev[i]->dev.kobj, "group_device");
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Provide an 'ungroup' attribute so the user can remove group devices no
|
|
|
|
* longer needed or accidentially created. Saves memory :)
|
|
|
|
*/
|
2007-03-15 13:50:34 -06:00
|
|
|
static void ccwgroup_ungroup_callback(struct device *dev)
|
|
|
|
{
|
|
|
|
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
|
|
|
|
|
2007-04-27 08:01:37 -06:00
|
|
|
mutex_lock(&gdev->reg_mutex);
|
2007-03-15 13:50:34 -06:00
|
|
|
__ccwgroup_remove_symlinks(gdev);
|
|
|
|
device_unregister(dev);
|
2007-04-27 08:01:37 -06:00
|
|
|
mutex_unlock(&gdev->reg_mutex);
|
2007-03-15 13:50:34 -06:00
|
|
|
}
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
static ssize_t
|
2005-05-17 04:43:27 -06:00
|
|
|
ccwgroup_ungroup_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
struct ccwgroup_device *gdev;
|
2007-03-15 13:50:34 -06:00
|
|
|
int rc;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
gdev = to_ccwgroupdev(dev);
|
|
|
|
|
|
|
|
if (gdev->state != CCWGROUP_OFFLINE)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2007-03-15 13:50:34 -06:00
|
|
|
/* Note that we cannot unregister the device from one of its
|
|
|
|
* attribute methods, so we have to use this roundabout approach.
|
|
|
|
*/
|
|
|
|
rc = device_schedule_callback(dev, ccwgroup_ungroup_callback);
|
|
|
|
if (rc)
|
|
|
|
count = rc;
|
2005-04-16 16:20:36 -06:00
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
|
|
static DEVICE_ATTR(ungroup, 0200, NULL, ccwgroup_ungroup_store);
|
|
|
|
|
|
|
|
static void
|
|
|
|
ccwgroup_release (struct device *dev)
|
|
|
|
{
|
|
|
|
struct ccwgroup_device *gdev;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
gdev = to_ccwgroupdev(dev);
|
|
|
|
|
|
|
|
for (i = 0; i < gdev->count; i++) {
|
2008-01-26 06:10:46 -07:00
|
|
|
dev_set_drvdata(&gdev->cdev[i]->dev, NULL);
|
2005-04-16 16:20:36 -06:00
|
|
|
put_device(&gdev->cdev[i]->dev);
|
|
|
|
}
|
|
|
|
kfree(gdev);
|
|
|
|
}
|
|
|
|
|
2007-02-05 13:18:53 -07:00
|
|
|
static int
|
2005-04-16 16:20:36 -06:00
|
|
|
__ccwgroup_create_symlinks(struct ccwgroup_device *gdev)
|
|
|
|
{
|
|
|
|
char str[8];
|
|
|
|
int i, rc;
|
|
|
|
|
|
|
|
for (i = 0; i < gdev->count; i++) {
|
|
|
|
rc = sysfs_create_link(&gdev->cdev[i]->dev.kobj, &gdev->dev.kobj,
|
|
|
|
"group_device");
|
|
|
|
if (rc) {
|
|
|
|
for (--i; i >= 0; i--)
|
|
|
|
sysfs_remove_link(&gdev->cdev[i]->dev.kobj,
|
|
|
|
"group_device");
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
for (i = 0; i < gdev->count; i++) {
|
|
|
|
sprintf(str, "cdev%d", i);
|
|
|
|
rc = sysfs_create_link(&gdev->dev.kobj, &gdev->cdev[i]->dev.kobj,
|
|
|
|
str);
|
|
|
|
if (rc) {
|
|
|
|
for (--i; i >= 0; i--) {
|
|
|
|
sprintf(str, "cdev%d", i);
|
|
|
|
sysfs_remove_link(&gdev->dev.kobj, str);
|
|
|
|
}
|
|
|
|
for (i = 0; i < gdev->count; i++)
|
|
|
|
sysfs_remove_link(&gdev->cdev[i]->dev.kobj,
|
|
|
|
"group_device");
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-10-12 08:11:17 -06:00
|
|
|
/**
|
|
|
|
* 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
|
2005-04-16 16:20:36 -06:00
|
|
|
*/
|
2007-10-12 08:11:17 -06:00
|
|
|
int ccwgroup_create(struct device *root, unsigned int creator_id,
|
|
|
|
struct ccw_driver *cdrv, int argc, char *argv[])
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
struct ccwgroup_device *gdev;
|
|
|
|
int i;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
if (argc > 256) /* disallow dumb users */
|
|
|
|
return -EINVAL;
|
|
|
|
|
2006-03-24 04:15:31 -07:00
|
|
|
gdev = kzalloc(sizeof(*gdev) + argc*sizeof(gdev->cdev[0]), GFP_KERNEL);
|
2005-04-16 16:20:36 -06:00
|
|
|
if (!gdev)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
atomic_set(&gdev->onoff, 0);
|
2007-04-27 08:01:37 -06:00
|
|
|
mutex_init(&gdev->reg_mutex);
|
|
|
|
mutex_lock(&gdev->reg_mutex);
|
2005-04-16 16:20:36 -06:00
|
|
|
for (i = 0; i < argc; i++) {
|
|
|
|
gdev->cdev[i] = get_ccwdev_by_busid(cdrv, argv[i]);
|
|
|
|
|
|
|
|
/* all devices have to be of the same type in
|
|
|
|
* order to be grouped */
|
|
|
|
if (!gdev->cdev[i]
|
|
|
|
|| gdev->cdev[i]->id.driver_info !=
|
|
|
|
gdev->cdev[0]->id.driver_info) {
|
|
|
|
rc = -EINVAL;
|
2007-04-27 08:01:37 -06:00
|
|
|
goto error;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
/* Don't allow a device to belong to more than one group. */
|
2008-01-26 06:10:46 -07:00
|
|
|
if (dev_get_drvdata(&gdev->cdev[i]->dev)) {
|
2005-04-16 16:20:36 -06:00
|
|
|
rc = -EINVAL;
|
2007-04-27 08:01:37 -06:00
|
|
|
goto error;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
2008-01-26 06:10:46 -07:00
|
|
|
dev_set_drvdata(&gdev->cdev[i]->dev, gdev);
|
2006-07-27 06:00:33 -06:00
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
gdev->creator_id = creator_id;
|
|
|
|
gdev->count = argc;
|
2006-08-30 06:33:35 -06:00
|
|
|
gdev->dev.bus = &ccwgroup_bus_type;
|
|
|
|
gdev->dev.parent = root;
|
|
|
|
gdev->dev.release = ccwgroup_release;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
snprintf (gdev->dev.bus_id, BUS_ID_SIZE, "%s",
|
|
|
|
gdev->cdev[0]->dev.bus_id);
|
|
|
|
|
|
|
|
rc = device_register(&gdev->dev);
|
|
|
|
if (rc)
|
2007-04-27 08:01:37 -06:00
|
|
|
goto error;
|
2005-04-16 16:20:36 -06:00
|
|
|
get_device(&gdev->dev);
|
|
|
|
rc = device_create_file(&gdev->dev, &dev_attr_ungroup);
|
|
|
|
|
|
|
|
if (rc) {
|
|
|
|
device_unregister(&gdev->dev);
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
|
|
|
|
rc = __ccwgroup_create_symlinks(gdev);
|
|
|
|
if (!rc) {
|
2007-04-27 08:01:37 -06:00
|
|
|
mutex_unlock(&gdev->reg_mutex);
|
2005-04-16 16:20:36 -06:00
|
|
|
put_device(&gdev->dev);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
device_remove_file(&gdev->dev, &dev_attr_ungroup);
|
|
|
|
device_unregister(&gdev->dev);
|
|
|
|
error:
|
|
|
|
for (i = 0; i < argc; i++)
|
|
|
|
if (gdev->cdev[i]) {
|
2008-01-26 06:10:46 -07:00
|
|
|
if (dev_get_drvdata(&gdev->cdev[i]->dev) == gdev)
|
|
|
|
dev_set_drvdata(&gdev->cdev[i]->dev, NULL);
|
2006-07-27 06:00:33 -06:00
|
|
|
put_device(&gdev->cdev[i]->dev);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
2007-04-27 08:01:37 -06:00
|
|
|
mutex_unlock(&gdev->reg_mutex);
|
|
|
|
put_device(&gdev->dev);
|
2005-04-16 16:20:36 -06:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init
|
|
|
|
init_ccwgroup (void)
|
|
|
|
{
|
|
|
|
return bus_register (&ccwgroup_bus_type);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit
|
|
|
|
cleanup_ccwgroup (void)
|
|
|
|
{
|
|
|
|
bus_unregister (&ccwgroup_bus_type);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(init_ccwgroup);
|
|
|
|
module_exit(cleanup_ccwgroup);
|
|
|
|
|
|
|
|
/************************** driver stuff ******************************/
|
|
|
|
|
|
|
|
static int
|
|
|
|
ccwgroup_set_online(struct ccwgroup_device *gdev)
|
|
|
|
{
|
|
|
|
struct ccwgroup_driver *gdrv;
|
|
|
|
int ret;
|
|
|
|
|
2006-01-06 01:19:07 -07:00
|
|
|
if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
|
2005-04-16 16:20:36 -06:00
|
|
|
return -EAGAIN;
|
|
|
|
if (gdev->state == CCWGROUP_ONLINE) {
|
|
|
|
ret = 0;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
if (!gdev->dev.driver) {
|
|
|
|
ret = -EINVAL;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
gdrv = to_ccwgroupdrv (gdev->dev.driver);
|
2005-11-07 01:59:05 -07:00
|
|
|
if ((ret = gdrv->set_online ? gdrv->set_online(gdev) : 0))
|
2005-04-16 16:20:36 -06:00
|
|
|
goto out;
|
|
|
|
|
|
|
|
gdev->state = CCWGROUP_ONLINE;
|
|
|
|
out:
|
|
|
|
atomic_set(&gdev->onoff, 0);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
ccwgroup_set_offline(struct ccwgroup_device *gdev)
|
|
|
|
{
|
|
|
|
struct ccwgroup_driver *gdrv;
|
|
|
|
int ret;
|
|
|
|
|
2006-01-06 01:19:07 -07:00
|
|
|
if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
|
2005-04-16 16:20:36 -06:00
|
|
|
return -EAGAIN;
|
|
|
|
if (gdev->state == CCWGROUP_OFFLINE) {
|
|
|
|
ret = 0;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
if (!gdev->dev.driver) {
|
|
|
|
ret = -EINVAL;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
gdrv = to_ccwgroupdrv (gdev->dev.driver);
|
2005-11-07 01:59:05 -07:00
|
|
|
if ((ret = gdrv->set_offline ? gdrv->set_offline(gdev) : 0))
|
2005-04-16 16:20:36 -06:00
|
|
|
goto out;
|
|
|
|
|
|
|
|
gdev->state = CCWGROUP_OFFLINE;
|
|
|
|
out:
|
|
|
|
atomic_set(&gdev->onoff, 0);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t
|
2005-05-17 04:43:27 -06:00
|
|
|
ccwgroup_online_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
struct ccwgroup_device *gdev;
|
|
|
|
struct ccwgroup_driver *gdrv;
|
|
|
|
unsigned int value;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
gdev = to_ccwgroupdev(dev);
|
|
|
|
if (!dev->driver)
|
|
|
|
return count;
|
|
|
|
|
|
|
|
gdrv = to_ccwgroupdrv (gdev->dev.driver);
|
|
|
|
if (!try_module_get(gdrv->owner))
|
|
|
|
return -EINVAL;
|
|
|
|
|
2006-07-12 08:41:55 -06:00
|
|
|
value = simple_strtoul(buf, NULL, 0);
|
2005-04-16 16:20:36 -06:00
|
|
|
ret = count;
|
|
|
|
if (value == 1)
|
|
|
|
ccwgroup_set_online(gdev);
|
|
|
|
else if (value == 0)
|
|
|
|
ccwgroup_set_offline(gdev);
|
|
|
|
else
|
|
|
|
ret = -EINVAL;
|
|
|
|
module_put(gdrv->owner);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t
|
2005-05-17 04:43:27 -06:00
|
|
|
ccwgroup_online_show (struct device *dev, struct device_attribute *attr, char *buf)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
int online;
|
|
|
|
|
|
|
|
online = (to_ccwgroupdev(dev)->state == CCWGROUP_ONLINE);
|
|
|
|
|
|
|
|
return sprintf(buf, online ? "1\n" : "0\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
static DEVICE_ATTR(online, 0644, ccwgroup_online_show, ccwgroup_online_store);
|
|
|
|
|
|
|
|
static int
|
|
|
|
ccwgroup_probe (struct device *dev)
|
|
|
|
{
|
|
|
|
struct ccwgroup_device *gdev;
|
|
|
|
struct ccwgroup_driver *gdrv;
|
|
|
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
gdev = to_ccwgroupdev(dev);
|
|
|
|
gdrv = to_ccwgroupdrv(dev->driver);
|
|
|
|
|
|
|
|
if ((ret = device_create_file(dev, &dev_attr_online)))
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
ret = gdrv->probe ? gdrv->probe(gdev) : -ENODEV;
|
|
|
|
if (ret)
|
|
|
|
device_remove_file(dev, &dev_attr_online);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
ccwgroup_remove (struct device *dev)
|
|
|
|
{
|
|
|
|
struct ccwgroup_device *gdev;
|
|
|
|
struct ccwgroup_driver *gdrv;
|
|
|
|
|
|
|
|
gdev = to_ccwgroupdev(dev);
|
|
|
|
gdrv = to_ccwgroupdrv(dev->driver);
|
|
|
|
|
|
|
|
device_remove_file(dev, &dev_attr_online);
|
|
|
|
|
|
|
|
if (gdrv && gdrv->remove)
|
|
|
|
gdrv->remove(gdev);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2006-01-05 07:42:09 -07:00
|
|
|
static struct bus_type ccwgroup_bus_type = {
|
|
|
|
.name = "ccwgroup",
|
|
|
|
.match = ccwgroup_bus_match,
|
|
|
|
.uevent = ccwgroup_uevent,
|
|
|
|
.probe = ccwgroup_probe,
|
|
|
|
.remove = ccwgroup_remove,
|
|
|
|
};
|
|
|
|
|
2007-10-12 08:11:17 -06:00
|
|
|
/**
|
|
|
|
* 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)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
/* register our new driver with the core */
|
2006-08-30 06:33:35 -06:00
|
|
|
cdriver->driver.bus = &ccwgroup_bus_type;
|
|
|
|
cdriver->driver.name = cdriver->name;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
return driver_register(&cdriver->driver);
|
|
|
|
}
|
|
|
|
|
2005-06-25 15:55:27 -06:00
|
|
|
static int
|
2006-06-29 06:56:52 -06:00
|
|
|
__ccwgroup_match_all(struct device *dev, void *data)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2006-06-29 06:56:52 -06:00
|
|
|
return 1;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2007-10-12 08:11:17 -06:00
|
|
|
/**
|
|
|
|
* 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)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2006-06-29 06:56:52 -06:00
|
|
|
struct device *dev;
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/* We don't want ccwgroup devices to live longer than their driver. */
|
|
|
|
get_driver(&cdriver->driver);
|
2006-06-29 06:56:52 -06:00
|
|
|
while ((dev = driver_find_device(&cdriver->driver, NULL, NULL,
|
|
|
|
__ccwgroup_match_all))) {
|
2007-04-27 08:01:37 -06:00
|
|
|
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
|
|
|
|
|
|
|
|
mutex_lock(&gdev->reg_mutex);
|
|
|
|
__ccwgroup_remove_symlinks(gdev);
|
2006-06-29 06:56:52 -06:00
|
|
|
device_unregister(dev);
|
2007-04-27 08:01:37 -06:00
|
|
|
mutex_unlock(&gdev->reg_mutex);
|
2006-06-29 06:56:52 -06:00
|
|
|
put_device(dev);
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
put_driver(&cdriver->driver);
|
|
|
|
driver_unregister(&cdriver->driver);
|
|
|
|
}
|
|
|
|
|
2007-10-12 08:11:17 -06:00
|
|
|
/**
|
|
|
|
* 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)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-02-05 13:18:53 -07:00
|
|
|
static struct ccwgroup_device *
|
2005-04-16 16:20:36 -06:00
|
|
|
__ccwgroup_get_gdev_by_cdev(struct ccw_device *cdev)
|
|
|
|
{
|
|
|
|
struct ccwgroup_device *gdev;
|
|
|
|
|
2008-01-26 06:10:46 -07:00
|
|
|
gdev = dev_get_drvdata(&cdev->dev);
|
|
|
|
if (gdev) {
|
2005-04-16 16:20:36 -06:00
|
|
|
if (get_device(&gdev->dev)) {
|
2007-04-27 08:01:37 -06:00
|
|
|
mutex_lock(&gdev->reg_mutex);
|
2005-09-22 01:47:24 -06:00
|
|
|
if (device_is_registered(&gdev->dev))
|
2005-04-16 16:20:36 -06:00
|
|
|
return gdev;
|
2007-04-27 08:01:37 -06:00
|
|
|
mutex_unlock(&gdev->reg_mutex);
|
2005-04-16 16:20:36 -06:00
|
|
|
put_device(&gdev->dev);
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2007-10-12 08:11:17 -06:00
|
|
|
/**
|
|
|
|
* 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)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
struct ccwgroup_device *gdev;
|
|
|
|
|
|
|
|
/* Ignore offlining errors, device is gone anyway. */
|
|
|
|
ccw_device_set_offline(cdev);
|
|
|
|
/* If one of its devices is gone, the whole group is done for. */
|
|
|
|
gdev = __ccwgroup_get_gdev_by_cdev(cdev);
|
|
|
|
if (gdev) {
|
|
|
|
__ccwgroup_remove_symlinks(gdev);
|
|
|
|
device_unregister(&gdev->dev);
|
2007-04-27 08:01:37 -06:00
|
|
|
mutex_unlock(&gdev->reg_mutex);
|
2005-04-16 16:20:36 -06:00
|
|
|
put_device(&gdev->dev);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
EXPORT_SYMBOL(ccwgroup_driver_register);
|
|
|
|
EXPORT_SYMBOL(ccwgroup_driver_unregister);
|
|
|
|
EXPORT_SYMBOL(ccwgroup_create);
|
|
|
|
EXPORT_SYMBOL(ccwgroup_probe_ccwdev);
|
|
|
|
EXPORT_SYMBOL(ccwgroup_remove_ccwdev);
|