/******************************************************************************
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2007 - 2012 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
* USA
*
* The full GNU General Public License is included in this distribution
* in the file called LICENSE.GPL.
*
* Contact Information:
* Intel Linux Wireless <ilw@linux.intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
* BSD LICENSE
*
* Copyright(c) 2005 - 2012 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*****************************************************************************/
#include <linux/sched.h>
#include <linux/export.h>
#include "iwl-notif-wait.h"
void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_wait)
{
spin_lock_init(¬if_wait->notif_wait_lock);
INIT_LIST_HEAD(¬if_wait->notif_waits);
init_waitqueue_head(¬if_wait->notif_waitq);
}
EXPORT_SYMBOL_GPL(iwl_notification_wait_init);
void iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_wait,
struct iwl_rx_packet *pkt)
{
bool triggered = false;
if (!list_empty(¬if_wait->notif_waits)) {
struct iwl_notification_wait *w;
spin_lock(¬if_wait->notif_wait_lock);
list_for_each_entry(w, ¬if_wait->notif_waits, list) {
int i;
bool found = false;
/*
* If it already finished (triggered) or has been
* aborted then don't evaluate it again to avoid races,
* Otherwise the function could be called again even
* though it returned true before
*/
if (w->triggered || w->aborted)
continue;
for (i = 0; i < w->n_cmds; i++) {
if (w->cmds[i] == pkt->hdr.cmd) {
found = true;
break;
}
}
if (!found)
continue;
if (!w->fn || w->fn(notif_wait, pkt, w->fn_data)) {
w->triggered = true;
triggered = true;
}
}
spin_unlock(¬if_wait->notif_wait_lock);
}
if (triggered)
wake_up_all(¬if_wait->notif_waitq);
}
EXPORT_SYMBOL_GPL(iwl_notification_wait_notify);
void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_wait)
{
unsigned long flags;
struct iwl_notification_wait *wait_entry;
spin_lock_irqsave(¬if_wait->notif_wait_lock, flags);
list_for_each_entry(wait_entry, ¬if_wait->notif_waits, list)
wait_entry->aborted = true;
spin_unlock_irqrestore(¬if_wait->notif_wait_lock, flags);
wake_up_all(¬if_wait->notif_waitq);
}
EXPORT_SYMBOL_GPL(iwl_abort_notification_waits);
void
iwl_init_notification_wait(struct iwl_notif_wait_data *notif_wait,
struct iwl_notification_wait *wait_entry,
const u8 *cmds, int n_cmds,
bool (*fn)(struct iwl_notif_wait_data *notif_wait,
struct iwl_rx_packet *pkt, void *data),
void *fn_data)
{
if (WARN_ON(n_cmds > MAX_NOTIF_CMDS))
n_cmds = MAX_NOTIF_CMDS;
wait_entry->fn = fn;
wait_entry->fn_data = fn_data;
wait_entry->n_cmds = n_cmds;
memcpy(wait_entry->cmds, cmds, n_cmds);
wait_entry->triggered = false;
wait_entry->aborted = false;
spin_lock_bh(¬if_wait->notif_wait_lock);
list_add(&wait_entry->list, ¬if_wait->notif_waits);
spin_unlock_bh(¬if_wait->notif_wait_lock);
}
EXPORT_SYMBOL_GPL(iwl_init_notification_wait);
int iwl_wait_notification(struct iwl_notif_wait_data *notif_wait,
struct iwl_notification_wait *wait_entry,
unsigned long timeout)
{
int ret;
ret = wait_event_timeout(notif_wait->notif_waitq,
wait_entry->triggered || wait_entry->aborted,
timeout);
spin_lock_bh(¬if_wait->notif_wait_lock);
list_del(&wait_entry->list);
spin_unlock_bh(¬if_wait->notif_wait_lock);
if (wait_entry->aborted)
return -EIO;
/* return value is always >= 0 */
if (ret <= 0)
return -ETIMEDOUT;
return 0;
}
EXPORT_SYMBOL_GPL(iwl_wait_notification);
void iwl_remove_notification(struct iwl_notif_wait_data *notif_wait,
struct iwl_notification_wait *wait_entry)
{
spin_lock_bh(¬if_wait->notif_wait_lock);
list_del(&wait_entry->list);
spin_unlock_bh(¬if_wait->notif_wait_lock);
}
EXPORT_SYMBOL_GPL(iwl_remove_notification);
