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