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 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of version 2 of the GNU General Public License as
13 * published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
23 * USA
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25 * The full GNU General Public License is included in this distribution
26 * in the file called COPYING.
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28 * Contact Information:
29 * Intel Linux Wireless <linuxwifi@intel.com>
30 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
31 *
32 * BSD LICENSE
33 *
34 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
35 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
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63 *****************************************************************************/
64 #ifndef __iwl_notif_wait_h__
65 #define __iwl_notif_wait_h__
66
67 #include <linux/wait.h>
68
69 #include "iwl-trans.h"
70
71 struct iwl_notif_wait_data {
72 struct list_head notif_waits;
73 spinlock_t notif_wait_lock;
74 wait_queue_head_t notif_waitq;
75 };
76
77 #define MAX_NOTIF_CMDS 5
78
79 /**
80 * struct iwl_notification_wait - notification wait entry
81 * @list: list head for global list
82 * @fn: Function called with the notification. If the function
83 * returns true, the wait is over, if it returns false then
84 * the waiter stays blocked. If no function is given, any
85 * of the listed commands will unblock the waiter.
86 * @cmds: command IDs
87 * @n_cmds: number of command IDs
88 * @triggered: waiter should be woken up
89 * @aborted: wait was aborted
90 *
91 * This structure is not used directly, to wait for a
92 * notification declare it on the stack, and call
93 * iwl_init_notification_wait() with appropriate
94 * parameters. Then do whatever will cause the ucode
95 * to notify the driver, and to wait for that then
96 * call iwl_wait_notification().
97 *
98 * Each notification is one-shot. If at some point we
99 * need to support multi-shot notifications (which
100 * can't be allocated on the stack) we need to modify
101 * the code for them.
102 */
103 struct iwl_notification_wait {
104 struct list_head list;
105
106 bool (*fn)(struct iwl_notif_wait_data *notif_data,
107 struct iwl_rx_packet *pkt, void *data);
108 void *fn_data;
109
110 u16 cmds[MAX_NOTIF_CMDS];
111 u8 n_cmds;
112 bool triggered, aborted;
113 };
114
115
116 /* caller functions */
117 void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_data);
118 bool iwl_notification_wait(struct iwl_notif_wait_data *notif_data,
119 struct iwl_rx_packet *pkt);
120 void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_data);
121
122 static inline void
iwl_notification_notify(struct iwl_notif_wait_data * notif_data)123 iwl_notification_notify(struct iwl_notif_wait_data *notif_data)
124 {
125 wake_up_all(¬if_data->notif_waitq);
126 }
127
128 static inline void
iwl_notification_wait_notify(struct iwl_notif_wait_data * notif_data,struct iwl_rx_packet * pkt)129 iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_data,
130 struct iwl_rx_packet *pkt)
131 {
132 if (iwl_notification_wait(notif_data, pkt))
133 iwl_notification_notify(notif_data);
134 }
135
136 /* user functions */
137 void __acquires(wait_entry)
138 iwl_init_notification_wait(struct iwl_notif_wait_data *notif_data,
139 struct iwl_notification_wait *wait_entry,
140 const u16 *cmds, int n_cmds,
141 bool (*fn)(struct iwl_notif_wait_data *notif_data,
142 struct iwl_rx_packet *pkt, void *data),
143 void *fn_data);
144
145 int __must_check __releases(wait_entry)
146 iwl_wait_notification(struct iwl_notif_wait_data *notif_data,
147 struct iwl_notification_wait *wait_entry,
148 unsigned long timeout);
149
150 void __releases(wait_entry)
151 iwl_remove_notification(struct iwl_notif_wait_data *notif_data,
152 struct iwl_notification_wait *wait_entry);
153
154 #endif /* __iwl_notif_wait_h__ */
155