[linux-block.git] / drivers / isdn / mISDN / fsm.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * finite state machine implementation
 *
 * Author       Karsten Keil <kkeil@novell.com>
 *
 * Thanks to    Jan den Ouden
 *              Fritz Elfert
 * Copyright 2008  by Karsten Keil <kkeil@novell.com>
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/string.h>
#include "fsm.h"

#define FSM_TIMER_DEBUG 0

int
mISDN_FsmNew(struct Fsm *fsm,
	     struct FsmNode *fnlist, int fncount)
{
	int i;

	fsm->jumpmatrix =
		kzalloc(array3_size(sizeof(FSMFNPTR), fsm->state_count,
				    fsm->event_count),
			GFP_KERNEL);
	if (fsm->jumpmatrix == NULL)
		return -ENOMEM;

	for (i = 0; i < fncount; i++)
		if ((fnlist[i].state >= fsm->state_count) ||
		    (fnlist[i].event >= fsm->event_count)) {
			printk(KERN_ERR
			       "mISDN_FsmNew Error: %d st(%ld/%ld) ev(%ld/%ld)\n",
			       i, (long)fnlist[i].state, (long)fsm->state_count,
			       (long)fnlist[i].event, (long)fsm->event_count);
		} else
			fsm->jumpmatrix[fsm->state_count * fnlist[i].event +
					fnlist[i].state] = (FSMFNPTR) fnlist[i].routine;
	return 0;
}
EXPORT_SYMBOL(mISDN_FsmNew);

void
mISDN_FsmFree(struct Fsm *fsm)
{
	kfree((void *) fsm->jumpmatrix);
}
EXPORT_SYMBOL(mISDN_FsmFree);

int
mISDN_FsmEvent(struct FsmInst *fi, int event, void *arg)
{
	FSMFNPTR r;

	if ((fi->state >= fi->fsm->state_count) ||
	    (event >= fi->fsm->event_count)) {
		printk(KERN_ERR
		       "mISDN_FsmEvent Error st(%ld/%ld) ev(%d/%ld)\n",
		       (long)fi->state, (long)fi->fsm->state_count, event,
		       (long)fi->fsm->event_count);
		return 1;
	}
	r = fi->fsm->jumpmatrix[fi->fsm->state_count * event + fi->state];
	if (r) {
		if (fi->debug)
			fi->printdebug(fi, "State %s Event %s",
				       fi->fsm->strState[fi->state],
				       fi->fsm->strEvent[event]);
		r(fi, event, arg);
		return 0;
	} else {
		if (fi->debug)
			fi->printdebug(fi, "State %s Event %s no action",
				       fi->fsm->strState[fi->state],
				       fi->fsm->strEvent[event]);
		return 1;
	}
}
EXPORT_SYMBOL(mISDN_FsmEvent);

void
mISDN_FsmChangeState(struct FsmInst *fi, int newstate)
{
	fi->state = newstate;
	if (fi->debug)
		fi->printdebug(fi, "ChangeState %s",
			       fi->fsm->strState[newstate]);
}
EXPORT_SYMBOL(mISDN_FsmChangeState);

static void
FsmExpireTimer(struct timer_list *t)
{
	struct FsmTimer *ft = from_timer(ft, t, tl);
#if FSM_TIMER_DEBUG
	if (ft->fi->debug)
		ft->fi->printdebug(ft->fi, "FsmExpireTimer %lx", (long) ft);
#endif
	mISDN_FsmEvent(ft->fi, ft->event, ft->arg);
}

void
mISDN_FsmInitTimer(struct FsmInst *fi, struct FsmTimer *ft)
{
	ft->fi = fi;
#if FSM_TIMER_DEBUG
	if (ft->fi->debug)
		ft->fi->printdebug(ft->fi, "mISDN_FsmInitTimer %lx", (long) ft);
#endif
	timer_setup(&ft->tl, FsmExpireTimer, 0);
}
EXPORT_SYMBOL(mISDN_FsmInitTimer);

void
mISDN_FsmDelTimer(struct FsmTimer *ft, int where)
{
#if FSM_TIMER_DEBUG
	if (ft->fi->debug)
		ft->fi->printdebug(ft->fi, "mISDN_FsmDelTimer %lx %d",
				   (long) ft, where);
#endif
	del_timer(&ft->tl);
}
EXPORT_SYMBOL(mISDN_FsmDelTimer);

int
mISDN_FsmAddTimer(struct FsmTimer *ft,
		  int millisec, int event, void *arg, int where)
{

#if FSM_TIMER_DEBUG
	if (ft->fi->debug)
		ft->fi->printdebug(ft->fi, "mISDN_FsmAddTimer %lx %d %d",
				   (long) ft, millisec, where);
#endif

	if (timer_pending(&ft->tl)) {
		if (ft->fi->debug) {
			printk(KERN_WARNING
			       "mISDN_FsmAddTimer: timer already active!\n");
			ft->fi->printdebug(ft->fi,
					   "mISDN_FsmAddTimer already active!");
		}
		return -1;
	}
	ft->event = event;
	ft->arg = arg;
	ft->tl.expires = jiffies + (millisec * HZ) / 1000;
	add_timer(&ft->tl);
	return 0;
}
EXPORT_SYMBOL(mISDN_FsmAddTimer);

void
mISDN_FsmRestartTimer(struct FsmTimer *ft,
		      int millisec, int event, void *arg, int where)
{

#if FSM_TIMER_DEBUG
	if (ft->fi->debug)
		ft->fi->printdebug(ft->fi, "mISDN_FsmRestartTimer %lx %d %d",
				   (long) ft, millisec, where);
#endif

	if (timer_pending(&ft->tl))
		del_timer(&ft->tl);
	ft->event = event;
	ft->arg = arg;
	ft->tl.expires = jiffies + (millisec * HZ) / 1000;
	add_timer(&ft->tl);
}
EXPORT_SYMBOL(mISDN_FsmRestartTimer);
Commit	Line	Data
1802d0be	1	// SPDX-License-Identifier: GPL-2.0-only
1b2b03f8 KK	2	/*
	3	* finite state machine implementation
	4	*
	5	* Author Karsten Keil <kkeil@novell.com>
	6	*
	7	* Thanks to Jan den Ouden
	8	* Fritz Elfert
	9	* Copyright 2008 by Karsten Keil <kkeil@novell.com>
1b2b03f8 KK	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/slab.h>
	14	#include <linux/module.h>
	15	#include <linux/string.h>
	16	#include "fsm.h"
	17
	18	#define FSM_TIMER_DEBUG 0
	19
54a6a043	20	int
1b2b03f8	21	mISDN_FsmNew(struct Fsm *fsm,
475be4d8	22	struct FsmNode *fnlist, int fncount)
1b2b03f8 KK	23	{
	24	int i;
	25
6396bb22 KC	26	fsm->jumpmatrix =
	27	kzalloc(array3_size(sizeof(FSMFNPTR), fsm->state_count,
	28	fsm->event_count),
	29	GFP_KERNEL);
54a6a043 AV	30	if (fsm->jumpmatrix == NULL)
54a6a043 AV	31	return -ENOMEM;
1b2b03f8 KK	32
	33	for (i = 0; i < fncount; i++)
	34	if ((fnlist[i].state >= fsm->state_count) \|\|
	35	(fnlist[i].event >= fsm->event_count)) {
	36	printk(KERN_ERR
475be4d8 JP	37	"mISDN_FsmNew Error: %d st(%ld/%ld) ev(%ld/%ld)\n",
	38	i, (long)fnlist[i].state, (long)fsm->state_count,
	39	(long)fnlist[i].event, (long)fsm->event_count);
1b2b03f8 KK	40	} else
1b2b03f8 KK	41	fsm->jumpmatrix[fsm->state_count * fnlist[i].event +
475be4d8	42	fnlist[i].state] = (FSMFNPTR) fnlist[i].routine;
54a6a043	43	return 0;
1b2b03f8 KK	44	}
	45	EXPORT_SYMBOL(mISDN_FsmNew);
	46
	47	void
	48	mISDN_FsmFree(struct Fsm *fsm)
	49	{
	50	kfree((void *) fsm->jumpmatrix);
	51	}
	52	EXPORT_SYMBOL(mISDN_FsmFree);
	53
	54	int
	55	mISDN_FsmEvent(struct FsmInst fi, int event, void arg)
	56	{
	57	FSMFNPTR r;
	58
	59	if ((fi->state >= fi->fsm->state_count) \|\|
	60	(event >= fi->fsm->event_count)) {
	61	printk(KERN_ERR
475be4d8 JP	62	"mISDN_FsmEvent Error st(%ld/%ld) ev(%d/%ld)\n",
	63	(long)fi->state, (long)fi->fsm->state_count, event,
	64	(long)fi->fsm->event_count);
1b2b03f8 KK	65	return 1;
	66	}
	67	r = fi->fsm->jumpmatrix[fi->fsm->state_count * event + fi->state];
	68	if (r) {
	69	if (fi->debug)
	70	fi->printdebug(fi, "State %s Event %s",
475be4d8 JP	71	fi->fsm->strState[fi->state],
475be4d8 JP	72	fi->fsm->strEvent[event]);
1b2b03f8 KK	73	r(fi, event, arg);
	74	return 0;
	75	} else {
	76	if (fi->debug)
	77	fi->printdebug(fi, "State %s Event %s no action",
475be4d8 JP	78	fi->fsm->strState[fi->state],
475be4d8 JP	79	fi->fsm->strEvent[event]);
1b2b03f8 KK	80	return 1;
	81	}
	82	}
	83	EXPORT_SYMBOL(mISDN_FsmEvent);
	84
	85	void
	86	mISDN_FsmChangeState(struct FsmInst *fi, int newstate)
	87	{
	88	fi->state = newstate;
	89	if (fi->debug)
	90	fi->printdebug(fi, "ChangeState %s",
475be4d8	91	fi->fsm->strState[newstate]);
1b2b03f8 KK	92	}
	93	EXPORT_SYMBOL(mISDN_FsmChangeState);
	94
	95	static void
e313ac12	96	FsmExpireTimer(struct timer_list *t)
1b2b03f8	97	{
e313ac12	98	struct FsmTimer *ft = from_timer(ft, t, tl);
1b2b03f8 KK	99	#if FSM_TIMER_DEBUG
	100	if (ft->fi->debug)
	101	ft->fi->printdebug(ft->fi, "FsmExpireTimer %lx", (long) ft);
	102	#endif
	103	mISDN_FsmEvent(ft->fi, ft->event, ft->arg);
	104	}
	105
	106	void
	107	mISDN_FsmInitTimer(struct FsmInst fi, struct FsmTimer ft)
	108	{
	109	ft->fi = fi;
1b2b03f8 KK	110	#if FSM_TIMER_DEBUG
	111	if (ft->fi->debug)
	112	ft->fi->printdebug(ft->fi, "mISDN_FsmInitTimer %lx", (long) ft);
	113	#endif
e313ac12	114	timer_setup(&ft->tl, FsmExpireTimer, 0);
1b2b03f8 KK	115	}
	116	EXPORT_SYMBOL(mISDN_FsmInitTimer);
	117
	118	void
	119	mISDN_FsmDelTimer(struct FsmTimer *ft, int where)
	120	{
	121	#if FSM_TIMER_DEBUG
	122	if (ft->fi->debug)
	123	ft->fi->printdebug(ft->fi, "mISDN_FsmDelTimer %lx %d",
475be4d8	124	(long) ft, where);
1b2b03f8 KK	125	#endif
	126	del_timer(&ft->tl);
	127	}
	128	EXPORT_SYMBOL(mISDN_FsmDelTimer);
	129
	130	int
	131	mISDN_FsmAddTimer(struct FsmTimer *ft,
475be4d8	132	int millisec, int event, void *arg, int where)
1b2b03f8 KK	133	{
	134
	135	#if FSM_TIMER_DEBUG
	136	if (ft->fi->debug)
	137	ft->fi->printdebug(ft->fi, "mISDN_FsmAddTimer %lx %d %d",
475be4d8	138	(long) ft, millisec, where);
1b2b03f8 KK	139	#endif
	140
	141	if (timer_pending(&ft->tl)) {
	142	if (ft->fi->debug) {
	143	printk(KERN_WARNING
475be4d8	144	"mISDN_FsmAddTimer: timer already active!\n");
1b2b03f8	145	ft->fi->printdebug(ft->fi,
475be4d8	146	"mISDN_FsmAddTimer already active!");
1b2b03f8 KK	147	}
	148	return -1;
	149	}
1b2b03f8 KK	150	ft->event = event;
	151	ft->arg = arg;
	152	ft->tl.expires = jiffies + (millisec * HZ) / 1000;
	153	add_timer(&ft->tl);
	154	return 0;
	155	}
	156	EXPORT_SYMBOL(mISDN_FsmAddTimer);
	157
	158	void
	159	mISDN_FsmRestartTimer(struct FsmTimer *ft,
475be4d8	160	int millisec, int event, void *arg, int where)
1b2b03f8 KK	161	{
	162
	163	#if FSM_TIMER_DEBUG
	164	if (ft->fi->debug)
	165	ft->fi->printdebug(ft->fi, "mISDN_FsmRestartTimer %lx %d %d",
475be4d8	166	(long) ft, millisec, where);
1b2b03f8 KK	167	#endif
	168
	169	if (timer_pending(&ft->tl))
	170	del_timer(&ft->tl);
1b2b03f8 KK	171	ft->event = event;
	172	ft->arg = arg;
	173	ft->tl.expires = jiffies + (millisec * HZ) / 1000;
	174	add_timer(&ft->tl);
	175	}
	176	EXPORT_SYMBOL(mISDN_FsmRestartTimer);