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Linux/include/net/irda/timer.h

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  1 /*********************************************************************
  2  *                
  3  * Filename:      timer.h
  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:   Thu Oct  7 12:25:24 1999
 10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
 11  * 
 12  *     Copyright (c) 1997, 1998-1999 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 #ifndef TIMER_H
 28 #define TIMER_H
 29 
 30 #include <linux/timer.h>
 31 #include <linux/jiffies.h>
 32 
 33 #include <asm/param.h>  /* for HZ */
 34 
 35 #include <net/irda/irda.h>
 36 
 37 /* A few forward declarations (to make compiler happy) */
 38 struct irlmp_cb;
 39 struct irlap_cb;
 40 struct lsap_cb;
 41 struct lap_cb;
 42 
 43 /* 
 44  *  Timeout definitions, some defined in IrLAP 6.13.5 - p. 92
 45  */
 46 #define POLL_TIMEOUT        (450*HZ/1000)    /* Must never exceed 500 ms */
 47 #define FINAL_TIMEOUT       (500*HZ/1000)    /* Must never exceed 500 ms */
 48 
 49 /* 
 50  *  Normally twice of p-timer. Note 3, IrLAP 6.3.11.2 - p. 60 suggests
 51  *  at least twice duration of the P-timer.
 52  */
 53 #define WD_TIMEOUT          (POLL_TIMEOUT*2)
 54 
 55 #define MEDIABUSY_TIMEOUT   (500*HZ/1000)    /* 500 msec */
 56 #define SMALLBUSY_TIMEOUT   (100*HZ/1000)    /* 100 msec - IrLAP 6.13.4 */
 57 
 58 /*
 59  *  Slot timer must never exceed 85 ms, and must always be at least 25 ms, 
 60  *  suggested to  75-85 msec by IrDA lite. This doesn't work with a lot of
 61  *  devices, and other stackes uses a lot more, so it's best we do it as well
 62  *  (Note : this is the default value and sysctl overides it - Jean II)
 63  */
 64 #define SLOT_TIMEOUT            (90*HZ/1000)
 65 
 66 /* 
 67  *  The latest discovery frame (XID) is longer due to the extra discovery
 68  *  information (hints, device name...). This is its extra length.
 69  *  We use that when setting the query timeout. Jean II
 70  */
 71 #define XIDEXTRA_TIMEOUT        (34*HZ/1000)  /* 34 msec */
 72 
 73 #define WATCHDOG_TIMEOUT        (20*HZ)       /* 20 sec */
 74 
 75 typedef void (*TIMER_CALLBACK)(void *);
 76 
 77 static inline void irda_start_timer(struct timer_list *ptimer, int timeout, 
 78                                     void* data, TIMER_CALLBACK callback)
 79 {
 80         ptimer->function = (void (*)(unsigned long)) callback;
 81         ptimer->data = (unsigned long) data;
 82         
 83         /* Set new value for timer (update or add timer).
 84          * We use mod_timer() because it's more efficient and also
 85          * safer with respect to race conditions - Jean II */
 86         mod_timer(ptimer, jiffies + timeout);
 87 }
 88 
 89 
 90 void irlap_start_slot_timer(struct irlap_cb *self, int timeout);
 91 void irlap_start_query_timer(struct irlap_cb *self, int S, int s);
 92 void irlap_start_final_timer(struct irlap_cb *self, int timeout);
 93 void irlap_start_wd_timer(struct irlap_cb *self, int timeout);
 94 void irlap_start_backoff_timer(struct irlap_cb *self, int timeout);
 95 
 96 void irlap_start_mbusy_timer(struct irlap_cb *self, int timeout);
 97 void irlap_stop_mbusy_timer(struct irlap_cb *);
 98 
 99 void irlmp_start_watchdog_timer(struct lsap_cb *, int timeout);
100 void irlmp_start_discovery_timer(struct irlmp_cb *, int timeout);
101 void irlmp_start_idle_timer(struct lap_cb *, int timeout);
102 void irlmp_stop_idle_timer(struct lap_cb *self);
103 
104 #endif
105 
106 

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