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/* Driver Manager Device Unregister (removal) implementation
*
* COPYRIGHT (c) 2011 Cobham Gaisler AB.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <stdlib.h>
#include <drvmgr/drvmgr.h>
#include <drvmgr/drvmgr_list.h>
#include "drvmgr_internal.h"
/* Unregister all children on a bus.
*
* This function is called from the bus driver, from a "safe" state where
* devices will not be added or removed on this particular bus at this time
*/
int drvmgr_children_unregister(struct drvmgr_bus *bus)
{
int err;
while (bus->children != NULL) {
err = drvmgr_dev_unregister(bus->children);
if (err != DRVMGR_OK) {
/* An error occurred */
bus->children->error = err;
return err;
}
}
return DRVMGR_OK;
}
/* Unregister a BUS and all it's devices.
*
* It is up to the bus driver to remove all it's devices, either manually
* one by one calling drvmgr_dev_unregister(), or by letting the driver
* manager unregister all children by calling drvmgr_children_unregister().
*/
int drvmgr_bus_unregister(struct drvmgr_bus *bus)
{
struct drvmgr *mgr = &drvmgr;
struct drvmgr_list *list;
if (bus->ops->remove == NULL)
return DRVMGR_ENOSYS;
/* Call Bus driver to clean things up, it must remove all children */
bus->error = bus->ops->remove(bus);
if (bus->error != DRVMGR_OK)
return bus->error;
/* Check that bus driver has done its job and removed all children */
if (bus->children != NULL)
return DRVMGR_FAIL;
/* Remove References to bus */
bus->dev->bus = NULL;
DRVMGR_LOCK_WRITE();
/* Remove bus from bus-list */
if (bus->state & BUS_STATE_LIST_INACTIVE)
list = &mgr->buses_inactive;
else
list = &mgr->buses[bus->level];
drvmgr_list_remove(list, bus);
DRVMGR_UNLOCK();
/* All references to this bus has been removed at this point */
free(bus);
return DRVMGR_OK;
}
/* Separate Driver and Device from each other */
int drvmgr_dev_drv_separate(struct drvmgr_dev *dev)
{
struct drvmgr *mgr = &drvmgr;
struct drvmgr_dev *subdev, **pprev;
int rc;
/* Remove children if this device exports a bus of devices. All
* children must be removed first as they depend upon the bus
* services this bridge provide.
*/
if (dev->bus) {
rc = drvmgr_bus_unregister(dev->bus);
if (rc != DRVMGR_OK)
return rc;
}
if (dev->drv == NULL)
return DRVMGR_OK;
/* Remove device by letting assigned driver take care of hardware
* issues
*/
if (!dev->drv->ops->remove) {
/* No remove function is considered severe when someone
* is trying to remove the device
*/
return DRVMGR_ENOSYS;
}
dev->error = dev->drv->ops->remove(dev);
if (dev->error != DRVMGR_OK)
return DRVMGR_FAIL;
DRVMGR_LOCK_WRITE();
/* Delete device from driver's device list */
pprev = &dev->drv->dev;
subdev = dev->drv->dev;
while (subdev != dev) {
pprev = &subdev->next_in_drv;
subdev = subdev->next_in_drv;
}
*pprev = subdev->next_in_drv;
dev->drv->dev_cnt--;
/* Move device to inactive list */
drvmgr_list_remove(&mgr->devices[dev->level], dev);
dev->level = 0;
dev->state &= ~(DEV_STATE_UNITED|DEV_STATE_INIT_DONE);
dev->state |= DEV_STATE_LIST_INACTIVE;
drvmgr_list_add_tail(&mgr->devices_inactive, dev);
DRVMGR_UNLOCK();
/* Free Device Driver Private memory if allocated previously by
* Driver manager.
*/
if (dev->drv->dev_priv_size && dev->priv) {
free(dev->priv);
dev->priv = NULL;
}
dev->drv = NULL;
return DRVMGR_OK;
}
/* Unregister device,
* - let assigned driver handle deletion
* - remove from device list
* - remove from driver list
* - remove from bus list
*/
int drvmgr_dev_unregister(struct drvmgr_dev *dev)
{
struct drvmgr *mgr = &drvmgr;
struct drvmgr_dev *subdev, **pprev;
int err;
/* Separate device from driver, if the device is united with a driver.
*
* If this device is a bridge all child buses/devices are also removed.
*/
err = drvmgr_dev_drv_separate(dev);
if (err != DRVMGR_OK)
return err;
DRVMGR_LOCK_WRITE();
/* Remove it from inactive list */
drvmgr_list_remove(&mgr->devices_inactive, dev);
/* Remove device from parent bus list (no check if dev not in list) */
pprev = &dev->parent->children;
subdev = dev->parent->children;
while (subdev != dev) {
pprev = &subdev->next_in_bus;
subdev = subdev->next_in_bus;
}
*pprev = subdev->next_in_bus;
dev->parent->dev_cnt--;
DRVMGR_UNLOCK();
/* All references to this device has been removed at this point */
free(dev);
return DRVMGR_OK;
}
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