1/* $Id: fsm.c,v 1.14.6.4 2001/09/23 22:24:47 Exp $ 2 * 3 * Finite state machine 4 * 5 * Author Karsten Keil 6 * Copyright by Karsten Keil <keil@isdn4linux.de> 7 * by Kai Germaschewski <kai.germaschewski@gmx.de> 8 * 9 * This software may be used and distributed according to the terms 10 * of the GNU General Public License, incorporated herein by reference. 11 * 12 * Thanks to Jan den Ouden 13 * Fritz Elfert 14 * 15 */ 16 17#include <linux/module.h> 18#include <linux/slab.h> 19#include <linux/init.h> 20#include "hisax.h" 21 22#define FSM_TIMER_DEBUG 0 23 24int 25FsmNew(struct Fsm *fsm, struct FsmNode *fnlist, int fncount) 26{ 27 int i; 28 29 fsm->jumpmatrix = (FSMFNPTR *) 30 kzalloc(sizeof (FSMFNPTR) * fsm->state_count * fsm->event_count, GFP_KERNEL); 31 if (!fsm->jumpmatrix) 32 return -ENOMEM; 33 34 for (i = 0; i < fncount; i++) 35 if ((fnlist[i].state>=fsm->state_count) || (fnlist[i].event>=fsm->event_count)) { 36 printk(KERN_ERR "FsmNew Error line %d st(%ld/%ld) ev(%ld/%ld)\n", 37 i,(long)fnlist[i].state,(long)fsm->state_count, 38 (long)fnlist[i].event,(long)fsm->event_count); 39 } else 40 fsm->jumpmatrix[fsm->state_count * fnlist[i].event + 41 fnlist[i].state] = (FSMFNPTR) fnlist[i].routine; 42 return 0; 43} 44 45void 46FsmFree(struct Fsm *fsm) 47{ 48 kfree((void *) fsm->jumpmatrix); 49} 50 51int 52FsmEvent(struct FsmInst *fi, int event, void *arg) 53{ 54 FSMFNPTR r; 55 56 if ((fi->state>=fi->fsm->state_count) || (event >= fi->fsm->event_count)) { 57 printk(KERN_ERR "FsmEvent Error st(%ld/%ld) ev(%d/%ld)\n", 58 (long)fi->state,(long)fi->fsm->state_count,event,(long)fi->fsm->event_count); 59 return(1); 60 } 61 r = fi->fsm->jumpmatrix[fi->fsm->state_count * event + fi->state]; 62 if (r) { 63 if (fi->debug) 64 fi->printdebug(fi, "State %s Event %s", 65 fi->fsm->strState[fi->state], 66 fi->fsm->strEvent[event]); 67 r(fi, event, arg); 68 return (0); 69 } else { 70 if (fi->debug) 71 fi->printdebug(fi, "State %s Event %s no routine", 72 fi->fsm->strState[fi->state], 73 fi->fsm->strEvent[event]); 74 return (!0); 75 } 76} 77 78void 79FsmChangeState(struct FsmInst *fi, int newstate) 80{ 81 fi->state = newstate; 82 if (fi->debug) 83 fi->printdebug(fi, "ChangeState %s", 84 fi->fsm->strState[newstate]); 85} 86 87static void 88FsmExpireTimer(struct FsmTimer *ft) 89{ 90#if FSM_TIMER_DEBUG 91 if (ft->fi->debug) 92 ft->fi->printdebug(ft->fi, "FsmExpireTimer %lx", (long) ft); 93#endif 94 FsmEvent(ft->fi, ft->event, ft->arg); 95} 96 97void 98FsmInitTimer(struct FsmInst *fi, struct FsmTimer *ft) 99{ 100 ft->fi = fi; 101 ft->tl.function = (void *) FsmExpireTimer; 102 ft->tl.data = (long) ft; 103#if FSM_TIMER_DEBUG 104 if (ft->fi->debug) 105 ft->fi->printdebug(ft->fi, "FsmInitTimer %lx", (long) ft); 106#endif 107 init_timer(&ft->tl); 108} 109 110void 111FsmDelTimer(struct FsmTimer *ft, int where) 112{ 113#if FSM_TIMER_DEBUG 114 if (ft->fi->debug) 115 ft->fi->printdebug(ft->fi, "FsmDelTimer %lx %d", (long) ft, where); 116#endif 117 del_timer(&ft->tl); 118} 119 120int 121FsmAddTimer(struct FsmTimer *ft, 122 int millisec, int event, void *arg, int where) 123{ 124 125#if FSM_TIMER_DEBUG 126 if (ft->fi->debug) 127 ft->fi->printdebug(ft->fi, "FsmAddTimer %lx %d %d", 128 (long) ft, millisec, where); 129#endif 130 131 if (timer_pending(&ft->tl)) { 132 printk(KERN_WARNING "FsmAddTimer: timer already active!\n"); 133 ft->fi->printdebug(ft->fi, "FsmAddTimer already active!"); 134 return -1; 135 } 136 init_timer(&ft->tl); 137 ft->event = event; 138 ft->arg = arg; 139 ft->tl.expires = jiffies + (millisec * HZ) / 1000; 140 add_timer(&ft->tl); 141 return 0; 142} 143 144void 145FsmRestartTimer(struct FsmTimer *ft, 146 int millisec, int event, void *arg, int where) 147{ 148 149#if FSM_TIMER_DEBUG 150 if (ft->fi->debug) 151 ft->fi->printdebug(ft->fi, "FsmRestartTimer %lx %d %d", 152 (long) ft, millisec, where); 153#endif 154 155 if (timer_pending(&ft->tl)) 156 del_timer(&ft->tl); 157 init_timer(&ft->tl); 158 ft->event = event; 159 ft->arg = arg; 160 ft->tl.expires = jiffies + (millisec * HZ) / 1000; 161 add_timer(&ft->tl); 162} 163