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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 | /** * $Id: fsm.c,v 1.1 2000/11/30 11:21:08 bird Exp $ * * A generic FSM based on fsm used in isdn4linux * * $Log: fsm.c,v $ * Revision 1.1 2000/11/30 11:21:08 bird * Support for new ctc driver * * Revision 1.2 2000/11/10 17:25:11 felfert * Changes for kernel 2.4 * * Revision 1.1 2000/11/03 16:58:45 felfert * Initial import * * */ #include "fsm.h" #include <linux/version.h> fsm_instance * init_fsm(char *name, const char **state_names, const char **event_names, int nr_states, int nr_events, const fsm_node *tmpl, int tmpl_len, int order) { int i; fsm_instance *this; fsm_function_t *m; fsm *f; this = (fsm_instance *)kmalloc(sizeof(fsm_instance), order); if (this == NULL) { printk(KERN_WARNING "fsm(%s): init_fsm: Couldn't alloc instance\n", name); return NULL; } memset(this, 0, sizeof(fsm_instance)); strncpy(this->name, name, sizeof(this->name)); f = (fsm *)kmalloc(sizeof(fsm), order); if (f == NULL) { printk(KERN_WARNING "fsm(%s): init_fsm: Couldn't alloc fsm\n", name); kfree_fsm(this); return NULL; } memset(f, 0, sizeof(fsm)); f->nr_events = nr_events; f->nr_states = nr_states; f->event_names = event_names; f->state_names = state_names; this->f = f; m = (fsm_function_t *)kmalloc( sizeof(fsm_function_t) * nr_states * nr_events, order); if (m == NULL) { printk(KERN_WARNING "fsm(%s): init_fsm: Couldn't alloc jumptable\n", name); kfree_fsm(this); return NULL; } memset(m, 0, sizeof(fsm_function_t) * f->nr_states * f->nr_events); f->jumpmatrix = m; for (i = 0; i < tmpl_len; i++) { if ((tmpl[i].cond_state >= nr_states) || (tmpl[i].cond_event >= nr_events) ) { printk(KERN_ERR "fsm(%s): init_fsm: Bad template l=%d st(%ld/%ld) ev(%ld/%ld)\n", name, i, (long)tmpl[i].cond_state, (long)f->nr_states, (long)tmpl[i].cond_event, (long)f->nr_events); kfree_fsm(this); return NULL; } else m[nr_states * tmpl[i].cond_event + tmpl[i].cond_state] = tmpl[i].function; } return this; } void kfree_fsm(fsm_instance *this) { if (this) { if (this->f) { if (this->f->jumpmatrix) kfree(this->f->jumpmatrix); kfree(this->f); } kfree(this); } else printk(KERN_WARNING "fsm: kfree_fsm called with NULL argument\n"); } #if FSM_DEBUG_HISTORY void fsm_print_history(fsm_instance *fi) { int idx = 0; int i; if (fi->history_size >= FSM_HISTORY_SIZE) idx = fi->history_index; printk(KERN_DEBUG "fsm(%s): History:\n", fi->name); for (i = 0; i < fi->history_size; i++) { int e = fi->history[idx].event; int s = fi->history[idx++].state; idx %= FSM_HISTORY_SIZE; if (e == -1) printk(KERN_DEBUG " S=%s\n", fi->f->state_names[s]); else printk(KERN_DEBUG " S=%s E=%s\n", fi->f->state_names[s], fi->f->event_names[e]); } fi->history_size = fi->history_index = 0; } void fsm_record_history(fsm_instance *fi, int state, int event) { fi->history[fi->history_index].state = state; fi->history[fi->history_index++].event = event; fi->history_index %= FSM_HISTORY_SIZE; if (fi->history_size < FSM_HISTORY_SIZE) fi->history_size++; } #endif const char * fsm_getstate_str(fsm_instance *fi) { int st = atomic_read(&fi->state); if (st >= fi->f->nr_states) return "Invalid"; return fi->f->state_names[st]; } static void fsm_expire_timer(fsm_timer *this) { #if FSM_TIMER_DEBUG printk(KERN_DEBUG "fsm(%s): Timer %p expired\n", this->fi->name, this); #endif fsm_event(this->fi, this->expire_event, this->event_arg); } void fsm_settimer(fsm_instance *fi, fsm_timer *this) { this->fi = fi; this->tl.function = (void *)fsm_expire_timer; this->tl.data = (long)this; #if FSM_TIMER_DEBUG printk(KERN_DEBUG "fsm(%s): Create timer %p\n", fi->name, this); #endif init_timer(&this->tl); } void fsm_deltimer(fsm_timer *this) { #if FSM_TIMER_DEBUG printk(KERN_DEBUG "fsm(%s): Delete timer %p\n", this->fi->name, this); #endif del_timer(&this->tl); } int fsm_addtimer(fsm_timer *this, int millisec, int event, void *arg) { #if FSM_TIMER_DEBUG printk(KERN_DEBUG "fsm(%s): Add timer %p %dms\n", this->fi->name, this, millisec); #endif #if LINUX_VERSION_CODE >= 0x020300 if (this->tl.list.next || this->tl.list.prev) { printk(KERN_WARNING "fsm(%s): timer already active!\n", this->fi->name); return -1; } #else if (this->tl.next || this->tl.prev) { printk(KERN_WARNING "fsm(%s): timer already active!\n", this->fi->name); return -1; } #endif init_timer(&this->tl); this->tl.function = (void *)fsm_expire_timer; this->tl.data = (long)this; this->expire_event = event; this->event_arg = arg; this->tl.expires = jiffies + (millisec * HZ) / 1000; add_timer(&this->tl); return 0; } void fsm_modtimer(fsm_timer *this, int millisec, int event, void *arg) { #if FSM_TIMER_DEBUG printk(KERN_DEBUG "fsm(%s): Restart timer %p %dms\n", this->fi->name, this, millisec); #endif #if LINUX_VERSION_CODE >= 0x020300 if (this->tl.list.next || this->tl.list.prev) del_timer(&this->tl); #else if (this->tl.next || this->tl.prev) del_timer(&this->tl); #endif init_timer(&this->tl); this->tl.function = (void *)fsm_expire_timer; this->tl.data = (long)this; this->expire_event = event; this->event_arg = arg; this->tl.expires = jiffies + (millisec * HZ) / 1000; add_timer(&this->tl); } |