1/*********************************************************************
2 *
3 * Filename:      timer.c
4 * Version:
5 * Description:
6 * Status:        Experimental.
7 * Author:        Dag Brattli <dagb@cs.uit.no>
8 * Created at:    Sat Aug 16 00:59:29 1997
9 * Modified at:   Wed Dec  8 12:50:34 1999
10 * Modified by:   Dag Brattli <dagb@cs.uit.no>
11 *
12 *     Copyright (c) 1997, 1999 Dag Brattli <dagb@cs.uit.no>,
13 *     All Rights Reserved.
14 *     Copyright (c) 2000-2002 Jean Tourrilhes <jt@hpl.hp.com>
15 *
16 *     This program is free software; you can redistribute it and/or
17 *     modify it under the terms of the GNU General Public License as
18 *     published by the Free Software Foundation; either version 2 of
19 *     the License, or (at your option) any later version.
20 *
21 *     Neither Dag Brattli nor University of Tromsø admit liability nor
22 *     provide warranty for any of this software. This material is
23 *     provided "AS-IS" and at no charge.
24 *
25 ********************************************************************/
26
27#include <linux/delay.h>
28
29#include <net/irda/timer.h>
30#include <net/irda/irda.h>
31#include <net/irda/irda_device.h>
32#include <net/irda/irlap.h>
33#include <net/irda/irlmp.h>
34
35extern int  sysctl_slot_timeout;
36
37static void irlap_slot_timer_expired(void* data);
38static void irlap_query_timer_expired(void* data);
39static void irlap_final_timer_expired(void* data);
40static void irlap_wd_timer_expired(void* data);
41static void irlap_backoff_timer_expired(void* data);
42static void irlap_media_busy_expired(void* data);
43
44void irlap_start_slot_timer(struct irlap_cb *self, int timeout)
45{
46	irda_start_timer(&self->slot_timer, timeout, (void *) self,
47			 irlap_slot_timer_expired);
48}
49
50void irlap_start_query_timer(struct irlap_cb *self, int S, int s)
51{
52	int timeout;
53
54	/* Calculate when the peer discovery should end. Normally, we
55	 * get the end-of-discovery frame, so this is just in case
56	 * we miss it.
57	 * Basically, we multiply the number of remaining slots by our
58	 * slot time, plus add some extra time to properly receive the last
59	 * discovery packet (which is longer due to extra discovery info),
60	 * to avoid messing with for incoming connections requests and
61	 * to accommodate devices that perform discovery slower than us.
62	 * Jean II */
63	timeout = ((sysctl_slot_timeout * HZ / 1000) * (S - s)
64		   + XIDEXTRA_TIMEOUT + SMALLBUSY_TIMEOUT);
65
66	/* Set or re-set the timer. We reset the timer for each received
67	 * discovery query, which allow us to automatically adjust to
68	 * the speed of the peer discovery (faster or slower). Jean II */
69	irda_start_timer( &self->query_timer, timeout, (void *) self,
70			  irlap_query_timer_expired);
71}
72
73void irlap_start_final_timer(struct irlap_cb *self, int timeout)
74{
75	irda_start_timer(&self->final_timer, timeout, (void *) self,
76			 irlap_final_timer_expired);
77}
78
79void irlap_start_wd_timer(struct irlap_cb *self, int timeout)
80{
81	irda_start_timer(&self->wd_timer, timeout, (void *) self,
82			 irlap_wd_timer_expired);
83}
84
85void irlap_start_backoff_timer(struct irlap_cb *self, int timeout)
86{
87	irda_start_timer(&self->backoff_timer, timeout, (void *) self,
88			 irlap_backoff_timer_expired);
89}
90
91void irlap_start_mbusy_timer(struct irlap_cb *self, int timeout)
92{
93	irda_start_timer(&self->media_busy_timer, timeout,
94			 (void *) self, irlap_media_busy_expired);
95}
96
97void irlap_stop_mbusy_timer(struct irlap_cb *self)
98{
99	/* If timer is activated, kill it! */
100	del_timer(&self->media_busy_timer);
101
102	/* If we are in NDM, there is a bunch of events in LAP that
103	 * that be pending due to the media_busy condition, such as
104	 * CONNECT_REQUEST and SEND_UI_FRAME. If we don't generate
105	 * an event, they will wait forever...
106	 * Jean II */
107	if (self->state == LAP_NDM)
108		irlap_do_event(self, MEDIA_BUSY_TIMER_EXPIRED, NULL, NULL);
109}
110
111void irlmp_start_watchdog_timer(struct lsap_cb *self, int timeout)
112{
113	irda_start_timer(&self->watchdog_timer, timeout, (void *) self,
114			 irlmp_watchdog_timer_expired);
115}
116
117void irlmp_start_discovery_timer(struct irlmp_cb *self, int timeout)
118{
119	irda_start_timer(&self->discovery_timer, timeout, (void *) self,
120			 irlmp_discovery_timer_expired);
121}
122
123void irlmp_start_idle_timer(struct lap_cb *self, int timeout)
124{
125	irda_start_timer(&self->idle_timer, timeout, (void *) self,
126			 irlmp_idle_timer_expired);
127}
128
129void irlmp_stop_idle_timer(struct lap_cb *self)
130{
131	/* If timer is activated, kill it! */
132	del_timer(&self->idle_timer);
133}
134
135/*
136 * Function irlap_slot_timer_expired (data)
137 *
138 *    IrLAP slot timer has expired
139 *
140 */
141static void irlap_slot_timer_expired(void *data)
142{
143	struct irlap_cb *self = (struct irlap_cb *) data;
144
145	IRDA_ASSERT(self != NULL, return;);
146	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
147
148	irlap_do_event(self, SLOT_TIMER_EXPIRED, NULL, NULL);
149}
150
151/*
152 * Function irlap_query_timer_expired (data)
153 *
154 *    IrLAP query timer has expired
155 *
156 */
157static void irlap_query_timer_expired(void *data)
158{
159	struct irlap_cb *self = (struct irlap_cb *) data;
160
161	IRDA_ASSERT(self != NULL, return;);
162	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
163
164	irlap_do_event(self, QUERY_TIMER_EXPIRED, NULL, NULL);
165}
166
167/*
168 * Function irda_final_timer_expired (data)
169 *
170 *
171 *
172 */
173static void irlap_final_timer_expired(void *data)
174{
175	struct irlap_cb *self = (struct irlap_cb *) data;
176
177	IRDA_ASSERT(self != NULL, return;);
178	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
179
180	irlap_do_event(self, FINAL_TIMER_EXPIRED, NULL, NULL);
181}
182
183/*
184 * Function irda_wd_timer_expired (data)
185 *
186 *
187 *
188 */
189static void irlap_wd_timer_expired(void *data)
190{
191	struct irlap_cb *self = (struct irlap_cb *) data;
192
193	IRDA_ASSERT(self != NULL, return;);
194	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
195
196	irlap_do_event(self, WD_TIMER_EXPIRED, NULL, NULL);
197}
198
199/*
200 * Function irda_backoff_timer_expired (data)
201 *
202 *
203 *
204 */
205static void irlap_backoff_timer_expired(void *data)
206{
207	struct irlap_cb *self = (struct irlap_cb *) data;
208
209	IRDA_ASSERT(self != NULL, return;);
210	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
211
212	irlap_do_event(self, BACKOFF_TIMER_EXPIRED, NULL, NULL);
213}
214
215
216/*
217 * Function irtty_media_busy_expired (data)
218 *
219 *
220 */
221static void irlap_media_busy_expired(void *data)
222{
223	struct irlap_cb *self = (struct irlap_cb *) data;
224
225	IRDA_ASSERT(self != NULL, return;);
226
227	irda_device_set_media_busy(self->netdev, FALSE);
228	/* Note : the LAP event will be send in irlap_stop_mbusy_timer(),
229	* to catch other cases where the flag is cleared (for example
230	* after a discovery) - Jean II */
231}
232