net/irda/timer.c

   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
  35 extern int  sysctl_slot_timeout;
  36
  37 static void irlap_slot_timer_expired(void* data);
  38 static void irlap_query_timer_expired(void* data);
  39 static void irlap_final_timer_expired(void* data);
  40 static void irlap_wd_timer_expired(void* data);
  41 static void irlap_backoff_timer_expired(void* data);
  42 static void irlap_media_busy_expired(void* data);
  43
  44 void 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
  50 void 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
  73 void 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
  79 void 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
  85 void 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
  91 void 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
  97 void 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
 111 void 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
 117 void 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
 123 void 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
 129 void 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  */
 141 static 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  */
 157 static 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  */
 173 static 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  */
 189 static 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  */
 205 static 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  */
 221 static 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 }