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 <asm/system.h>
  28 #include <linux/config.h>
  29 #include <linux/delay.h>
  30
  31 #include <net/irda/timer.h>
  32 #include <net/irda/irda.h>
  33 #include <net/irda/irda_device.h>
  34 #include <net/irda/irlap.h>
  35 #include <net/irda/irlmp.h>
  36
  37 extern int  sysctl_slot_timeout;
  38
  39 static void irlap_slot_timer_expired(void* data);
  40 static void irlap_query_timer_expired(void* data);
  41 static void irlap_final_timer_expired(void* data);
  42 static void irlap_wd_timer_expired(void* data);
  43 static void irlap_backoff_timer_expired(void* data);
  44 static void irlap_media_busy_expired(void* data);
  45
  46 void irlap_start_slot_timer(struct irlap_cb *self, int timeout)
  47 {
  48         irda_start_timer(&self->slot_timer, timeout, (void *) self,
  49                          irlap_slot_timer_expired);
  50 }
  51
  52 void irlap_start_query_timer(struct irlap_cb *self, int S, int s)
  53 {
  54         int timeout;
  55
  56         /* Calculate when the peer discovery should end. Normally, we
  57          * get the end-of-discovery frame, so this is just in case
  58          * we miss it.
  59          * Basically, we multiply the number of remaining slots by our
  60          * slot time, plus add some extra time to properly receive the last
  61          * discovery packet (which is longer due to extra discovery info),
  62          * to avoid messing with for incomming connections requests and
  63          * to accomodate devices that perform discovery slower than us.
  64          * Jean II */
  65         timeout = ((sysctl_slot_timeout * HZ / 1000) * (S - s)
  66                    + XIDEXTRA_TIMEOUT + SMALLBUSY_TIMEOUT);
  67
  68         /* Set or re-set the timer. We reset the timer for each received
  69          * discovery query, which allow us to automatically adjust to
  70          * the speed of the peer discovery (faster or slower). Jean II */
  71         irda_start_timer( &self->query_timer, timeout, (void *) self,
  72                           irlap_query_timer_expired);
  73 }
  74
  75 void irlap_start_final_timer(struct irlap_cb *self, int timeout)
  76 {
  77         irda_start_timer(&self->final_timer, timeout, (void *) self,
  78                          irlap_final_timer_expired);
  79 }
  80
  81 void irlap_start_wd_timer(struct irlap_cb *self, int timeout)
  82 {
  83         irda_start_timer(&self->wd_timer, timeout, (void *) self,
  84                          irlap_wd_timer_expired);
  85 }
  86
  87 void irlap_start_backoff_timer(struct irlap_cb *self, int timeout)
  88 {
  89         irda_start_timer(&self->backoff_timer, timeout, (void *) self,
  90                          irlap_backoff_timer_expired);
  91 }
  92
  93 void irlap_start_mbusy_timer(struct irlap_cb *self, int timeout)
  94 {
  95         irda_start_timer(&self->media_busy_timer, timeout,
  96                          (void *) self, irlap_media_busy_expired);
  97 }
  98
  99 void irlap_stop_mbusy_timer(struct irlap_cb *self)
 100 {
 101         /* If timer is activated, kill it! */
 102         del_timer(&self->media_busy_timer);
 103
 104         /* If we are in NDM, there is a bunch of events in LAP that
 105          * that be pending due to the media_busy condition, such as
 106          * CONNECT_REQUEST and SEND_UI_FRAME. If we don't generate
 107          * an event, they will wait forever...
 108          * Jean II */
 109         if (self->state == LAP_NDM)
 110                 irlap_do_event(self, MEDIA_BUSY_TIMER_EXPIRED, NULL, NULL);
 111 }
 112
 113 void irlmp_start_watchdog_timer(struct lsap_cb *self, int timeout)
 114 {
 115         irda_start_timer(&self->watchdog_timer, timeout, (void *) self,
 116                          irlmp_watchdog_timer_expired);
 117 }
 118
 119 void irlmp_start_discovery_timer(struct irlmp_cb *self, int timeout)
 120 {
 121         irda_start_timer(&self->discovery_timer, timeout, (void *) self,
 122                          irlmp_discovery_timer_expired);
 123 }
 124
 125 void irlmp_start_idle_timer(struct lap_cb *self, int timeout)
 126 {
 127         irda_start_timer(&self->idle_timer, timeout, (void *) self,
 128                          irlmp_idle_timer_expired);
 129 }
 130
 131 void irlmp_stop_idle_timer(struct lap_cb *self)
 132 {
 133         /* If timer is activated, kill it! */
 134         del_timer(&self->idle_timer);
 135 }
 136
 137 /*
 138  * Function irlap_slot_timer_expired (data)
 139  *
 140  *    IrLAP slot timer has expired
 141  *
 142  */
 143 static void irlap_slot_timer_expired(void *data)
 144 {
 145         struct irlap_cb *self = (struct irlap_cb *) data;
 146
 147         IRDA_ASSERT(self != NULL, return;);
 148         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 149
 150         irlap_do_event(self, SLOT_TIMER_EXPIRED, NULL, NULL);
 151 }
 152
 153 /*
 154  * Function irlap_query_timer_expired (data)
 155  *
 156  *    IrLAP query timer has expired
 157  *
 158  */
 159 static void irlap_query_timer_expired(void *data)
 160 {
 161         struct irlap_cb *self = (struct irlap_cb *) data;
 162
 163         IRDA_ASSERT(self != NULL, return;);
 164         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 165
 166         irlap_do_event(self, QUERY_TIMER_EXPIRED, NULL, NULL);
 167 }
 168
 169 /*
 170  * Function irda_final_timer_expired (data)
 171  *
 172  *
 173  *
 174  */
 175 static void irlap_final_timer_expired(void *data)
 176 {
 177         struct irlap_cb *self = (struct irlap_cb *) data;
 178
 179         IRDA_ASSERT(self != NULL, return;);
 180         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 181
 182         irlap_do_event(self, FINAL_TIMER_EXPIRED, NULL, NULL);
 183 }
 184
 185 /*
 186  * Function irda_wd_timer_expired (data)
 187  *
 188  *
 189  *
 190  */
 191 static void irlap_wd_timer_expired(void *data)
 192 {
 193         struct irlap_cb *self = (struct irlap_cb *) data;
 194
 195         IRDA_ASSERT(self != NULL, return;);
 196         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 197
 198         irlap_do_event(self, WD_TIMER_EXPIRED, NULL, NULL);
 199 }
 200
 201 /*
 202  * Function irda_backoff_timer_expired (data)
 203  *
 204  *
 205  *
 206  */
 207 static void irlap_backoff_timer_expired(void *data)
 208 {
 209         struct irlap_cb *self = (struct irlap_cb *) data;
 210
 211         IRDA_ASSERT(self != NULL, return;);
 212         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 213
 214         irlap_do_event(self, BACKOFF_TIMER_EXPIRED, NULL, NULL);
 215 }
 216
 217
 218 /*
 219  * Function irtty_media_busy_expired (data)
 220  *
 221  *
 222  */
 223 void irlap_media_busy_expired(void* data)
 224 {
 225         struct irlap_cb *self = (struct irlap_cb *) data;
 226
 227         IRDA_ASSERT(self != NULL, return;);
 228
 229         irda_device_set_media_busy(self->netdev, FALSE);
 230         /* Note : the LAP event will be send in irlap_stop_mbusy_timer(),
 231         * to catch other cases where the flag is cleared (for example
 232         * after a discovery) - Jean II */
 233 }