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/*
* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <string.h>
#include <ipxe/list.h>
#include <ipxe/tables.h>
#include <ipxe/init.h>
#include <ipxe/interface.h>
#include <ipxe/device.h>
/**
* @file
*
* Device model
*
*/
/** Registered root devices */
static LIST_HEAD ( devices );
/** Device removal inhibition counter */
int device_keep_count = 0;
/**
* Probe a root device
*
* @v rootdev Root device
* @ret rc Return status code
*/
static int rootdev_probe ( struct root_device *rootdev ) {
int rc;
DBG ( "Adding %s root bus\n", rootdev->dev.name );
if ( ( rc = rootdev->driver->probe ( rootdev ) ) != 0 ) {
DBG ( "Failed to add %s root bus: %s\n",
rootdev->dev.name, strerror ( rc ) );
return rc;
}
return 0;
}
/**
* Remove a root device
*
* @v rootdev Root device
*/
static void rootdev_remove ( struct root_device *rootdev ) {
rootdev->driver->remove ( rootdev );
DBG ( "Removed %s root bus\n", rootdev->dev.name );
}
/**
* Probe all devices
*
* This initiates probing for all devices in the system. After this
* call, the device hierarchy will be populated, and all hardware
* should be ready to use.
*/
static void probe_devices ( void ) {
struct root_device *rootdev;
int rc;
for_each_table_entry ( rootdev, ROOT_DEVICES ) {
list_add ( &rootdev->dev.siblings, &devices );
INIT_LIST_HEAD ( &rootdev->dev.children );
if ( ( rc = rootdev_probe ( rootdev ) ) != 0 )
list_del ( &rootdev->dev.siblings );
}
}
/**
* Remove all devices
*
*/
static void remove_devices ( int booting __unused ) {
struct root_device *rootdev;
struct root_device *tmp;
if ( device_keep_count != 0 ) {
DBG ( "Refusing to remove devices on shutdown\n" );
return;
}
list_for_each_entry_safe ( rootdev, tmp, &devices, dev.siblings ) {
rootdev_remove ( rootdev );
list_del ( &rootdev->dev.siblings );
}
}
struct startup_fn startup_devices __startup_fn ( STARTUP_NORMAL ) = {
.startup = probe_devices,
.shutdown = remove_devices,
};
/**
* Identify a device behind an interface
*
* @v intf Interface
* @ret device Device, or NULL
*/
struct device * identify_device ( struct interface *intf ) {
struct interface *dest;
identify_device_TYPE ( void * ) *op =
intf_get_dest_op ( intf, identify_device, &dest );
void *object = intf_object ( dest );
void *device;
if ( op ) {
device = op ( object );
} else {
/* Default is to return NULL */
device = NULL;
}
intf_put ( dest );
return device;
}
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