linux/drivers/uwb/pal.c
David Vrabel b60066c141 uwb: add symlinks in sysfs between radio controllers and PALs
Add a facility for PALs to have symlinks to their radio controller
(and vice-versa) and make WUSB host controllers use this.

Signed-off-by: David Vrabel <david.vrabel@csr.com>
2008-09-17 16:54:35 +01:00

92 lines
2.2 KiB
C

/*
* UWB PAL support.
*
* Copyright (C) 2008 Cambridge Silicon Radio Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <linux/kernel.h>
#include <linux/uwb.h>
#include "uwb-internal.h"
/**
* uwb_pal_init - initialize a UWB PAL
* @pal: the PAL to initialize
*/
void uwb_pal_init(struct uwb_pal *pal)
{
INIT_LIST_HEAD(&pal->node);
}
EXPORT_SYMBOL_GPL(uwb_pal_init);
/**
* uwb_pal_register - register a UWB PAL
* @rc: the radio controller the PAL will be using
* @pal: the PAL
*
* The PAL must be initialized with uwb_pal_init().
*/
int uwb_pal_register(struct uwb_rc *rc, struct uwb_pal *pal)
{
int ret;
if (pal->device) {
ret = sysfs_create_link(&pal->device->kobj,
&rc->uwb_dev.dev.kobj, "uwb_rc");
if (ret < 0)
return ret;
ret = sysfs_create_link(&rc->uwb_dev.dev.kobj,
&pal->device->kobj, pal->name);
if (ret < 0) {
sysfs_remove_link(&pal->device->kobj, "uwb_rc");
return ret;
}
}
spin_lock(&rc->pal_lock);
list_add(&pal->node, &rc->pals);
spin_unlock(&rc->pal_lock);
return 0;
}
EXPORT_SYMBOL_GPL(uwb_pal_register);
/**
* uwb_pal_register - unregister a UWB PAL
* @rc: the radio controller the PAL was using
* @pal: the PAL
*/
void uwb_pal_unregister(struct uwb_rc *rc, struct uwb_pal *pal)
{
spin_lock(&rc->pal_lock);
list_del(&pal->node);
spin_unlock(&rc->pal_lock);
if (pal->device) {
sysfs_remove_link(&rc->uwb_dev.dev.kobj, pal->name);
sysfs_remove_link(&pal->device->kobj, "uwb_rc");
}
}
EXPORT_SYMBOL_GPL(uwb_pal_unregister);
/**
* uwb_rc_pal_init - initialize the PAL related parts of a radio controller
* @rc: the radio controller
*/
void uwb_rc_pal_init(struct uwb_rc *rc)
{
spin_lock_init(&rc->pal_lock);
INIT_LIST_HEAD(&rc->pals);
}