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1/******************************************************************************
2 *
3 * This file is provided under a dual BSD/GPLv2 license.  When using or
4 * redistributing this file, you may do so under either license.
5 *
6 * GPL LICENSE SUMMARY
7 *
8 * Copyright(c) 2007 - 2014 Intel Corporation. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of version 2 of the GNU General Public License as
12 * published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
22 * USA
23 *
24 * The full GNU General Public License is included in this distribution
25 * in the file called COPYING.
26 *
27 * Contact Information:
28 *  Intel Linux Wireless <ilw@linux.intel.com>
29 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
30 *
31 * BSD LICENSE
32 *
33 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 *
40 *  * Redistributions of source code must retain the above copyright
41 *    notice, this list of conditions and the following disclaimer.
42 *  * Redistributions in binary form must reproduce the above copyright
43 *    notice, this list of conditions and the following disclaimer in
44 *    the documentation and/or other materials provided with the
45 *    distribution.
46 *  * Neither the name Intel Corporation nor the names of its
47 *    contributors may be used to endorse or promote products derived
48 *    from this software without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
54 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
56 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
57 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
58 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
59 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
60 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61 *
62 *****************************************************************************/
63#include <linux/sched.h>
64#include <linux/export.h>
65
66#include "iwl-drv.h"
67#include "iwl-notif-wait.h"
68
69
70void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_wait)
71{
72	spin_lock_init(&notif_wait->notif_wait_lock);
73	INIT_LIST_HEAD(&notif_wait->notif_waits);
74	init_waitqueue_head(&notif_wait->notif_waitq);
75}
76IWL_EXPORT_SYMBOL(iwl_notification_wait_init);
77
78void iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_wait,
79				  struct iwl_rx_packet *pkt)
80{
81	bool triggered = false;
82
83	if (!list_empty(&notif_wait->notif_waits)) {
84		struct iwl_notification_wait *w;
85
86		spin_lock(&notif_wait->notif_wait_lock);
87		list_for_each_entry(w, &notif_wait->notif_waits, list) {
88			int i;
89			bool found = false;
90
91			/*
92			 * If it already finished (triggered) or has been
93			 * aborted then don't evaluate it again to avoid races,
94			 * Otherwise the function could be called again even
95			 * though it returned true before
96			 */
97			if (w->triggered || w->aborted)
98				continue;
99
100			for (i = 0; i < w->n_cmds; i++) {
101				if (w->cmds[i] == pkt->hdr.cmd) {
102					found = true;
103					break;
104				}
105			}
106			if (!found)
107				continue;
108
109			if (!w->fn || w->fn(notif_wait, pkt, w->fn_data)) {
110				w->triggered = true;
111				triggered = true;
112			}
113		}
114		spin_unlock(&notif_wait->notif_wait_lock);
115
116	}
117
118	if (triggered)
119		wake_up_all(&notif_wait->notif_waitq);
120}
121IWL_EXPORT_SYMBOL(iwl_notification_wait_notify);
122
123void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_wait)
124{
125	struct iwl_notification_wait *wait_entry;
126
127	spin_lock(&notif_wait->notif_wait_lock);
128	list_for_each_entry(wait_entry, &notif_wait->notif_waits, list)
129		wait_entry->aborted = true;
130	spin_unlock(&notif_wait->notif_wait_lock);
131
132	wake_up_all(&notif_wait->notif_waitq);
133}
134IWL_EXPORT_SYMBOL(iwl_abort_notification_waits);
135
136void
137iwl_init_notification_wait(struct iwl_notif_wait_data *notif_wait,
138			   struct iwl_notification_wait *wait_entry,
139			   const u8 *cmds, int n_cmds,
140			   bool (*fn)(struct iwl_notif_wait_data *notif_wait,
141				      struct iwl_rx_packet *pkt, void *data),
142			   void *fn_data)
143{
144	if (WARN_ON(n_cmds > MAX_NOTIF_CMDS))
145		n_cmds = MAX_NOTIF_CMDS;
146
147	wait_entry->fn = fn;
148	wait_entry->fn_data = fn_data;
149	wait_entry->n_cmds = n_cmds;
150	memcpy(wait_entry->cmds, cmds, n_cmds);
151	wait_entry->triggered = false;
152	wait_entry->aborted = false;
153
154	spin_lock_bh(&notif_wait->notif_wait_lock);
155	list_add(&wait_entry->list, &notif_wait->notif_waits);
156	spin_unlock_bh(&notif_wait->notif_wait_lock);
157}
158IWL_EXPORT_SYMBOL(iwl_init_notification_wait);
159
160int iwl_wait_notification(struct iwl_notif_wait_data *notif_wait,
161			  struct iwl_notification_wait *wait_entry,
162			  unsigned long timeout)
163{
164	int ret;
165
166	ret = wait_event_timeout(notif_wait->notif_waitq,
167				 wait_entry->triggered || wait_entry->aborted,
168				 timeout);
169
170	spin_lock_bh(&notif_wait->notif_wait_lock);
171	list_del(&wait_entry->list);
172	spin_unlock_bh(&notif_wait->notif_wait_lock);
173
174	if (wait_entry->aborted)
175		return -EIO;
176
177	/* return value is always >= 0 */
178	if (ret <= 0)
179		return -ETIMEDOUT;
180	return 0;
181}
182IWL_EXPORT_SYMBOL(iwl_wait_notification);
183
184void iwl_remove_notification(struct iwl_notif_wait_data *notif_wait,
185			     struct iwl_notification_wait *wait_entry)
186{
187	spin_lock_bh(&notif_wait->notif_wait_lock);
188	list_del(&wait_entry->list);
189	spin_unlock_bh(&notif_wait->notif_wait_lock);
190}
191IWL_EXPORT_SYMBOL(iwl_remove_notification);
192