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 - 2012 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 LICENSE.GPL.
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 - 2012 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
65 #include "iwl-notif-wait.h"
66
67
iwl_notification_wait_init(struct iwl_notif_wait_data * notif_wait)68 void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_wait)
69 {
70 spin_lock_init(¬if_wait->notif_wait_lock);
71 INIT_LIST_HEAD(¬if_wait->notif_waits);
72 init_waitqueue_head(¬if_wait->notif_waitq);
73 }
74
iwl_notification_wait_notify(struct iwl_notif_wait_data * notif_wait,struct iwl_rx_packet * pkt)75 void iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_wait,
76 struct iwl_rx_packet *pkt)
77 {
78 if (!list_empty(¬if_wait->notif_waits)) {
79 struct iwl_notification_wait *w;
80
81 spin_lock(¬if_wait->notif_wait_lock);
82 list_for_each_entry(w, ¬if_wait->notif_waits, list) {
83 if (w->cmd != pkt->hdr.cmd)
84 continue;
85 w->triggered = true;
86 if (w->fn)
87 w->fn(notif_wait, pkt, w->fn_data);
88 }
89 spin_unlock(¬if_wait->notif_wait_lock);
90
91 wake_up_all(¬if_wait->notif_waitq);
92 }
93 }
94
iwl_abort_notification_waits(struct iwl_notif_wait_data * notif_wait)95 void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_wait)
96 {
97 unsigned long flags;
98 struct iwl_notification_wait *wait_entry;
99
100 spin_lock_irqsave(¬if_wait->notif_wait_lock, flags);
101 list_for_each_entry(wait_entry, ¬if_wait->notif_waits, list)
102 wait_entry->aborted = true;
103 spin_unlock_irqrestore(¬if_wait->notif_wait_lock, flags);
104
105 wake_up_all(¬if_wait->notif_waitq);
106 }
107
108
109 void
iwl_init_notification_wait(struct iwl_notif_wait_data * notif_wait,struct iwl_notification_wait * wait_entry,u8 cmd,void (* fn)(struct iwl_notif_wait_data * notif_wait,struct iwl_rx_packet * pkt,void * data),void * fn_data)110 iwl_init_notification_wait(struct iwl_notif_wait_data *notif_wait,
111 struct iwl_notification_wait *wait_entry,
112 u8 cmd,
113 void (*fn)(struct iwl_notif_wait_data *notif_wait,
114 struct iwl_rx_packet *pkt, void *data),
115 void *fn_data)
116 {
117 wait_entry->fn = fn;
118 wait_entry->fn_data = fn_data;
119 wait_entry->cmd = cmd;
120 wait_entry->triggered = false;
121 wait_entry->aborted = false;
122
123 spin_lock_bh(¬if_wait->notif_wait_lock);
124 list_add(&wait_entry->list, ¬if_wait->notif_waits);
125 spin_unlock_bh(¬if_wait->notif_wait_lock);
126 }
127
iwl_wait_notification(struct iwl_notif_wait_data * notif_wait,struct iwl_notification_wait * wait_entry,unsigned long timeout)128 int iwl_wait_notification(struct iwl_notif_wait_data *notif_wait,
129 struct iwl_notification_wait *wait_entry,
130 unsigned long timeout)
131 {
132 int ret;
133
134 ret = wait_event_timeout(notif_wait->notif_waitq,
135 wait_entry->triggered || wait_entry->aborted,
136 timeout);
137
138 spin_lock_bh(¬if_wait->notif_wait_lock);
139 list_del(&wait_entry->list);
140 spin_unlock_bh(¬if_wait->notif_wait_lock);
141
142 if (wait_entry->aborted)
143 return -EIO;
144
145 /* return value is always >= 0 */
146 if (ret <= 0)
147 return -ETIMEDOUT;
148 return 0;
149 }
150
iwl_remove_notification(struct iwl_notif_wait_data * notif_wait,struct iwl_notification_wait * wait_entry)151 void iwl_remove_notification(struct iwl_notif_wait_data *notif_wait,
152 struct iwl_notification_wait *wait_entry)
153 {
154 spin_lock_bh(¬if_wait->notif_wait_lock);
155 list_del(&wait_entry->list);
156 spin_unlock_bh(¬if_wait->notif_wait_lock);
157 }
158