[net-next-2.6.git] / sound / core / seq / seq_timer.c

/*
 *   ALSA sequencer Timer
 *   Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl>
 *                              Jaroslav Kysela <perex@perex.cz>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <sound/core.h>
#include <linux/slab.h>
#include "seq_timer.h"
#include "seq_queue.h"
#include "seq_info.h"

/* allowed sequencer timer frequencies, in Hz */
#define MIN_FREQUENCY		10
#define MAX_FREQUENCY		6250
#define DEFAULT_FREQUENCY	1000

#define SKEW_BASE	0x10000	/* 16bit shift */

static void snd_seq_timer_set_tick_resolution(struct snd_seq_timer *tmr)
{
	if (tmr->tempo < 1000000)
		tmr->tick.resolution = (tmr->tempo * 1000) / tmr->ppq;
	else {
		/* might overflow.. */
		unsigned int s;
		s = tmr->tempo % tmr->ppq;
		s = (s * 1000) / tmr->ppq;
		tmr->tick.resolution = (tmr->tempo / tmr->ppq) * 1000;
		tmr->tick.resolution += s;
	}
	if (tmr->tick.resolution <= 0)
		tmr->tick.resolution = 1;
	snd_seq_timer_update_tick(&tmr->tick, 0);
}

/* create new timer (constructor) */
struct snd_seq_timer *snd_seq_timer_new(void)
{
	struct snd_seq_timer *tmr;
	
	tmr = kzalloc(sizeof(*tmr), GFP_KERNEL);
	if (tmr == NULL) {
		snd_printd("malloc failed for snd_seq_timer_new() \n");
		return NULL;
	}
	spin_lock_init(&tmr->lock);

	/* reset setup to defaults */
	snd_seq_timer_defaults(tmr);
	
	/* reset time */
	snd_seq_timer_reset(tmr);
	
	return tmr;
}

/* delete timer (destructor) */
void snd_seq_timer_delete(struct snd_seq_timer **tmr)
{
	struct snd_seq_timer *t = *tmr;
	*tmr = NULL;

	if (t == NULL) {
		snd_printd("oops: snd_seq_timer_delete() called with NULL timer\n");
		return;
	}
	t->running = 0;

	/* reset time */
	snd_seq_timer_stop(t);
	snd_seq_timer_reset(t);

	kfree(t);
}

void snd_seq_timer_defaults(struct snd_seq_timer * tmr)
{
	/* setup defaults */
	tmr->ppq = 96;		/* 96 PPQ */
	tmr->tempo = 500000;	/* 120 BPM */
	snd_seq_timer_set_tick_resolution(tmr);
	tmr->running = 0;

	tmr->type = SNDRV_SEQ_TIMER_ALSA;
	tmr->alsa_id.dev_class = seq_default_timer_class;
	tmr->alsa_id.dev_sclass = seq_default_timer_sclass;
	tmr->alsa_id.card = seq_default_timer_card;
	tmr->alsa_id.device = seq_default_timer_device;
	tmr->alsa_id.subdevice = seq_default_timer_subdevice;
	tmr->preferred_resolution = seq_default_timer_resolution;

	tmr->skew = tmr->skew_base = SKEW_BASE;
}

void snd_seq_timer_reset(struct snd_seq_timer * tmr)
{
	unsigned long flags;

	spin_lock_irqsave(&tmr->lock, flags);

	/* reset time & songposition */
	tmr->cur_time.tv_sec = 0;
	tmr->cur_time.tv_nsec = 0;

	tmr->tick.cur_tick = 0;
	tmr->tick.fraction = 0;

	spin_unlock_irqrestore(&tmr->lock, flags);
}


/* called by timer interrupt routine. the period time since previous invocation is passed */
static void snd_seq_timer_interrupt(struct snd_timer_instance *timeri,
				    unsigned long resolution,
				    unsigned long ticks)
{
	unsigned long flags;
	struct snd_seq_queue *q = timeri->callback_data;
	struct snd_seq_timer *tmr;

	if (q == NULL)
		return;
	tmr = q->timer;
	if (tmr == NULL)
		return;
	if (!tmr->running)
		return;

	resolution *= ticks;
	if (tmr->skew != tmr->skew_base) {
		/* FIXME: assuming skew_base = 0x10000 */
		resolution = (resolution >> 16) * tmr->skew +
			(((resolution & 0xffff) * tmr->skew) >> 16);
	}

	spin_lock_irqsave(&tmr->lock, flags);

	/* update timer */
	snd_seq_inc_time_nsec(&tmr->cur_time, resolution);

	/* calculate current tick */
	snd_seq_timer_update_tick(&tmr->tick, resolution);

	/* register actual time of this timer update */
	do_gettimeofday(&tmr->last_update);

	spin_unlock_irqrestore(&tmr->lock, flags);

	/* check queues and dispatch events */
	snd_seq_check_queue(q, 1, 0);
}

/* set current tempo */
int snd_seq_timer_set_tempo(struct snd_seq_timer * tmr, int tempo)
{
	unsigned long flags;

	if (snd_BUG_ON(!tmr))
		return -EINVAL;
	if (tempo <= 0)
		return -EINVAL;
	spin_lock_irqsave(&tmr->lock, flags);
	if ((unsigned int)tempo != tmr->tempo) {
		tmr->tempo = tempo;
		snd_seq_timer_set_tick_resolution(tmr);
	}
	spin_unlock_irqrestore(&tmr->lock, flags);
	return 0;
}

/* set current ppq */
int snd_seq_timer_set_ppq(struct snd_seq_timer * tmr, int ppq)
{
	unsigned long flags;

	if (snd_BUG_ON(!tmr))
		return -EINVAL;
	if (ppq <= 0)
		return -EINVAL;
	spin_lock_irqsave(&tmr->lock, flags);
	if (tmr->running && (ppq != tmr->ppq)) {
		/* refuse to change ppq on running timers */
		/* because it will upset the song position (ticks) */
		spin_unlock_irqrestore(&tmr->lock, flags);
		snd_printd("seq: cannot change ppq of a running timer\n");
		return -EBUSY;
	}

	tmr->ppq = ppq;
	snd_seq_timer_set_tick_resolution(tmr);
	spin_unlock_irqrestore(&tmr->lock, flags);
	return 0;
}

/* set current tick position */
int snd_seq_timer_set_position_tick(struct snd_seq_timer *tmr,
				    snd_seq_tick_time_t position)
{
	unsigned long flags;

	if (snd_BUG_ON(!tmr))
		return -EINVAL;

	spin_lock_irqsave(&tmr->lock, flags);
	tmr->tick.cur_tick = position;
	tmr->tick.fraction = 0;
	spin_unlock_irqrestore(&tmr->lock, flags);
	return 0;
}

/* set current real-time position */
int snd_seq_timer_set_position_time(struct snd_seq_timer *tmr,
				    snd_seq_real_time_t position)
{
	unsigned long flags;

	if (snd_BUG_ON(!tmr))
		return -EINVAL;

	snd_seq_sanity_real_time(&position);
	spin_lock_irqsave(&tmr->lock, flags);
	tmr->cur_time = position;
	spin_unlock_irqrestore(&tmr->lock, flags);
	return 0;
}

/* set timer skew */
int snd_seq_timer_set_skew(struct snd_seq_timer *tmr, unsigned int skew,
			   unsigned int base)
{
	unsigned long flags;

	if (snd_BUG_ON(!tmr))
		return -EINVAL;

	/* FIXME */
	if (base != SKEW_BASE) {
		snd_printd("invalid skew base 0x%x\n", base);
		return -EINVAL;
	}
	spin_lock_irqsave(&tmr->lock, flags);
	tmr->skew = skew;
	spin_unlock_irqrestore(&tmr->lock, flags);
	return 0;
}

int snd_seq_timer_open(struct snd_seq_queue *q)
{
	struct snd_timer_instance *t;
	struct snd_seq_timer *tmr;
	char str[32];
	int err;

	tmr = q->timer;
	if (snd_BUG_ON(!tmr))
		return -EINVAL;
	if (tmr->timeri)
		return -EBUSY;
	sprintf(str, "sequencer queue %i", q->queue);
	if (tmr->type != SNDRV_SEQ_TIMER_ALSA)	/* standard ALSA timer */
		return -EINVAL;
	if (tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
		tmr->alsa_id.dev_sclass = SNDRV_TIMER_SCLASS_SEQUENCER;
	err = snd_timer_open(&t, str, &tmr->alsa_id, q->queue);
	if (err < 0 && tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_SLAVE) {
		if (tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_GLOBAL ||
		    tmr->alsa_id.device != SNDRV_TIMER_GLOBAL_SYSTEM) {
			struct snd_timer_id tid;
			memset(&tid, 0, sizeof(tid));
			tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
			tid.dev_sclass = SNDRV_TIMER_SCLASS_SEQUENCER;
			tid.card = -1;
			tid.device = SNDRV_TIMER_GLOBAL_SYSTEM;
			err = snd_timer_open(&t, str, &tid, q->queue);
		}
		if (err < 0) {
			snd_printk(KERN_ERR "seq fatal error: cannot create timer (%i)\n", err);
			return err;
		}
	}
	t->callback = snd_seq_timer_interrupt;
	t->callback_data = q;
	t->flags |= SNDRV_TIMER_IFLG_AUTO;
	tmr->timeri = t;
	return 0;
}

int snd_seq_timer_close(struct snd_seq_queue *q)
{
	struct snd_seq_timer *tmr;
	
	tmr = q->timer;
	if (snd_BUG_ON(!tmr))
		return -EINVAL;
	if (tmr->timeri) {
		snd_timer_stop(tmr->timeri);
		snd_timer_close(tmr->timeri);
		tmr->timeri = NULL;
	}
	return 0;
}

int snd_seq_timer_stop(struct snd_seq_timer * tmr)
{
	if (! tmr->timeri)
		return -EINVAL;
	if (!tmr->running)
		return 0;
	tmr->running = 0;
	snd_timer_pause(tmr->timeri);
	return 0;
}

static int initialize_timer(struct snd_seq_timer *tmr)
{
	struct snd_timer *t;
	unsigned long freq;

	t = tmr->timeri->timer;
	if (snd_BUG_ON(!t))
		return -EINVAL;

	freq = tmr->preferred_resolution;
	if (!freq)
		freq = DEFAULT_FREQUENCY;
	else if (freq < MIN_FREQUENCY)
		freq = MIN_FREQUENCY;
	else if (freq > MAX_FREQUENCY)
		freq = MAX_FREQUENCY;

	tmr->ticks = 1;
	if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
		unsigned long r = t->hw.resolution;
		if (! r && t->hw.c_resolution)
			r = t->hw.c_resolution(t);
		if (r) {
			tmr->ticks = (unsigned int)(1000000000uL / (r * freq));
			if (! tmr->ticks)
				tmr->ticks = 1;
		}
	}
	tmr->initialized = 1;
	return 0;
}

int snd_seq_timer_start(struct snd_seq_timer * tmr)
{
	if (! tmr->timeri)
		return -EINVAL;
	if (tmr->running)
		snd_seq_timer_stop(tmr);
	snd_seq_timer_reset(tmr);
	if (initialize_timer(tmr) < 0)
		return -EINVAL;
	snd_timer_start(tmr->timeri, tmr->ticks);
	tmr->running = 1;
	do_gettimeofday(&tmr->last_update);
	return 0;
}

int snd_seq_timer_continue(struct snd_seq_timer * tmr)
{
	if (! tmr->timeri)
		return -EINVAL;
	if (tmr->running)
		return -EBUSY;
	if (! tmr->initialized) {
		snd_seq_timer_reset(tmr);
		if (initialize_timer(tmr) < 0)
			return -EINVAL;
	}
	snd_timer_start(tmr->timeri, tmr->ticks);
	tmr->running = 1;
	do_gettimeofday(&tmr->last_update);
	return 0;
}

/* return current 'real' time. use timeofday() to get better granularity. */
snd_seq_real_time_t snd_seq_timer_get_cur_time(struct snd_seq_timer *tmr)
{
	snd_seq_real_time_t cur_time;

	cur_time = tmr->cur_time;
	if (tmr->running) { 
		struct timeval tm;
		int usec;
		do_gettimeofday(&tm);
		usec = (int)(tm.tv_usec - tmr->last_update.tv_usec);
		if (usec < 0) {
			cur_time.tv_nsec += (1000000 + usec) * 1000;
			cur_time.tv_sec += tm.tv_sec - tmr->last_update.tv_sec - 1;
		} else {
			cur_time.tv_nsec += usec * 1000;
			cur_time.tv_sec += tm.tv_sec - tmr->last_update.tv_sec;
		}
		snd_seq_sanity_real_time(&cur_time);
	}
                
	return cur_time;	
}

/* TODO: use interpolation on tick queue (will only be useful for very
 high PPQ values) */
snd_seq_tick_time_t snd_seq_timer_get_cur_tick(struct snd_seq_timer *tmr)
{
	return tmr->tick.cur_tick;
}


#ifdef CONFIG_PROC_FS
/* exported to seq_info.c */
void snd_seq_info_timer_read(struct snd_info_entry *entry,
			     struct snd_info_buffer *buffer)
{
	int idx;
	struct snd_seq_queue *q;
	struct snd_seq_timer *tmr;
	struct snd_timer_instance *ti;
	unsigned long resolution;
	
	for (idx = 0; idx < SNDRV_SEQ_MAX_QUEUES; idx++) {
		q = queueptr(idx);
		if (q == NULL)
			continue;
		if ((tmr = q->timer) == NULL ||
		    (ti = tmr->timeri) == NULL) {
			queuefree(q);
			continue;
		}
		snd_iprintf(buffer, "Timer for queue %i : %s\n", q->queue, ti->timer->name);
		resolution = snd_timer_resolution(ti) * tmr->ticks;
		snd_iprintf(buffer, "  Period time : %lu.%09lu\n", resolution / 1000000000, resolution % 1000000000);
		snd_iprintf(buffer, "  Skew : %u / %u\n", tmr->skew, tmr->skew_base);
		queuefree(q);
 	}
}
#endif /* CONFIG_PROC_FS */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* ALSA sequencer Timer
	3	* Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl>
c1017a4c	4	* Jaroslav Kysela <perex@perex.cz>
1da177e4 LT	5	*
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*
	21	*/
	22
1da177e4 LT	23	#include <sound/core.h>
	24	#include <linux/slab.h>
	25	#include "seq_timer.h"
	26	#include "seq_queue.h"
	27	#include "seq_info.h"
	28
87ef7779 CL	29	/* allowed sequencer timer frequencies, in Hz */
	30	#define MIN_FREQUENCY 10
	31	#define MAX_FREQUENCY 6250
	32	#define DEFAULT_FREQUENCY 1000
	33
1da177e4 LT	34	#define SKEW_BASE 0x10000 /* 16bit shift */
1da177e4 LT	35
a32f6674	36	static void snd_seq_timer_set_tick_resolution(struct snd_seq_timer *tmr)
1da177e4	37	{
a32f6674 CL	38	if (tmr->tempo < 1000000)
a32f6674 CL	39	tmr->tick.resolution = (tmr->tempo * 1000) / tmr->ppq;
1da177e4 LT	40	else {
	41	/* might overflow.. */
	42	unsigned int s;
a32f6674 CL	43	s = tmr->tempo % tmr->ppq;
	44	s = (s * 1000) / tmr->ppq;
	45	tmr->tick.resolution = (tmr->tempo / tmr->ppq) * 1000;
	46	tmr->tick.resolution += s;
1da177e4	47	}
a32f6674 CL	48	if (tmr->tick.resolution <= 0)
	49	tmr->tick.resolution = 1;
	50	snd_seq_timer_update_tick(&tmr->tick, 0);
1da177e4 LT	51	}
	52
	53	/* create new timer (constructor) */
c7e0b5bf	54	struct snd_seq_timer *snd_seq_timer_new(void)
1da177e4	55	{
c7e0b5bf	56	struct snd_seq_timer *tmr;
1da177e4	57
ecca82b4	58	tmr = kzalloc(sizeof(*tmr), GFP_KERNEL);
1da177e4 LT	59	if (tmr == NULL) {
	60	snd_printd("malloc failed for snd_seq_timer_new() \n");
	61	return NULL;
	62	}
	63	spin_lock_init(&tmr->lock);
	64
	65	/* reset setup to defaults */
	66	snd_seq_timer_defaults(tmr);
	67
	68	/* reset time */
	69	snd_seq_timer_reset(tmr);
	70
	71	return tmr;
	72	}
	73
	74	/* delete timer (destructor) */
c7e0b5bf	75	void snd_seq_timer_delete(struct snd_seq_timer **tmr)
1da177e4	76	{
c7e0b5bf	77	struct snd_seq_timer t = tmr;
1da177e4 LT	78	*tmr = NULL;
	79
	80	if (t == NULL) {
	81	snd_printd("oops: snd_seq_timer_delete() called with NULL timer\n");
	82	return;
	83	}
	84	t->running = 0;
	85
	86	/* reset time */
	87	snd_seq_timer_stop(t);
	88	snd_seq_timer_reset(t);
	89
	90	kfree(t);
	91	}
	92
c7e0b5bf	93	void snd_seq_timer_defaults(struct snd_seq_timer * tmr)
1da177e4 LT	94	{
	95	/* setup defaults */
	96	tmr->ppq = 96; /* 96 PPQ */
	97	tmr->tempo = 500000; /* 120 BPM */
a32f6674	98	snd_seq_timer_set_tick_resolution(tmr);
1da177e4 LT	99	tmr->running = 0;
	100
	101	tmr->type = SNDRV_SEQ_TIMER_ALSA;
	102	tmr->alsa_id.dev_class = seq_default_timer_class;
	103	tmr->alsa_id.dev_sclass = seq_default_timer_sclass;
	104	tmr->alsa_id.card = seq_default_timer_card;
	105	tmr->alsa_id.device = seq_default_timer_device;
	106	tmr->alsa_id.subdevice = seq_default_timer_subdevice;
	107	tmr->preferred_resolution = seq_default_timer_resolution;
	108
	109	tmr->skew = tmr->skew_base = SKEW_BASE;
	110	}
	111
c7e0b5bf	112	void snd_seq_timer_reset(struct snd_seq_timer * tmr)
1da177e4 LT	113	{
	114	unsigned long flags;
	115
	116	spin_lock_irqsave(&tmr->lock, flags);
	117
	118	/* reset time & songposition */
	119	tmr->cur_time.tv_sec = 0;
	120	tmr->cur_time.tv_nsec = 0;
	121
	122	tmr->tick.cur_tick = 0;
	123	tmr->tick.fraction = 0;
	124
	125	spin_unlock_irqrestore(&tmr->lock, flags);
	126	}
	127
	128
	129	/* called by timer interrupt routine. the period time since previous invocation is passed */
c7e0b5bf	130	static void snd_seq_timer_interrupt(struct snd_timer_instance *timeri,
1da177e4 LT	131	unsigned long resolution,
	132	unsigned long ticks)
	133	{
	134	unsigned long flags;
c7e0b5bf TI	135	struct snd_seq_queue *q = timeri->callback_data;
c7e0b5bf TI	136	struct snd_seq_timer *tmr;
1da177e4 LT	137
	138	if (q == NULL)
	139	return;
	140	tmr = q->timer;
	141	if (tmr == NULL)
	142	return;
	143	if (!tmr->running)
	144	return;
	145
	146	resolution *= ticks;
	147	if (tmr->skew != tmr->skew_base) {
	148	/* FIXME: assuming skew_base = 0x10000 */
	149	resolution = (resolution >> 16) * tmr->skew +
	150	(((resolution & 0xffff) * tmr->skew) >> 16);
	151	}
	152
	153	spin_lock_irqsave(&tmr->lock, flags);
	154
	155	/* update timer */
	156	snd_seq_inc_time_nsec(&tmr->cur_time, resolution);
	157
	158	/* calculate current tick */
	159	snd_seq_timer_update_tick(&tmr->tick, resolution);
	160
	161	/* register actual time of this timer update */
	162	do_gettimeofday(&tmr->last_update);
	163
	164	spin_unlock_irqrestore(&tmr->lock, flags);
	165
	166	/* check queues and dispatch events */
	167	snd_seq_check_queue(q, 1, 0);
	168	}
	169
	170	/* set current tempo */
c7e0b5bf	171	int snd_seq_timer_set_tempo(struct snd_seq_timer * tmr, int tempo)
1da177e4 LT	172	{
	173	unsigned long flags;
	174
7eaa943c TI	175	if (snd_BUG_ON(!tmr))
7eaa943c TI	176	return -EINVAL;
1da177e4 LT	177	if (tempo <= 0)
	178	return -EINVAL;
	179	spin_lock_irqsave(&tmr->lock, flags);
	180	if ((unsigned int)tempo != tmr->tempo) {
	181	tmr->tempo = tempo;
a32f6674	182	snd_seq_timer_set_tick_resolution(tmr);
1da177e4 LT	183	}
	184	spin_unlock_irqrestore(&tmr->lock, flags);
	185	return 0;
	186	}
	187
	188	/* set current ppq */
c7e0b5bf	189	int snd_seq_timer_set_ppq(struct snd_seq_timer * tmr, int ppq)
1da177e4 LT	190	{
	191	unsigned long flags;
	192
7eaa943c TI	193	if (snd_BUG_ON(!tmr))
7eaa943c TI	194	return -EINVAL;
1da177e4 LT	195	if (ppq <= 0)
	196	return -EINVAL;
	197	spin_lock_irqsave(&tmr->lock, flags);
	198	if (tmr->running && (ppq != tmr->ppq)) {
	199	/* refuse to change ppq on running timers */
	200	/* because it will upset the song position (ticks) */
	201	spin_unlock_irqrestore(&tmr->lock, flags);
	202	snd_printd("seq: cannot change ppq of a running timer\n");
	203	return -EBUSY;
	204	}
	205
	206	tmr->ppq = ppq;
a32f6674	207	snd_seq_timer_set_tick_resolution(tmr);
1da177e4 LT	208	spin_unlock_irqrestore(&tmr->lock, flags);
	209	return 0;
	210	}
	211
	212	/* set current tick position */
c7e0b5bf TI	213	int snd_seq_timer_set_position_tick(struct snd_seq_timer *tmr,
c7e0b5bf TI	214	snd_seq_tick_time_t position)
1da177e4 LT	215	{
	216	unsigned long flags;
	217
7eaa943c TI	218	if (snd_BUG_ON(!tmr))
7eaa943c TI	219	return -EINVAL;
1da177e4 LT	220
	221	spin_lock_irqsave(&tmr->lock, flags);
	222	tmr->tick.cur_tick = position;
	223	tmr->tick.fraction = 0;
	224	spin_unlock_irqrestore(&tmr->lock, flags);
	225	return 0;
	226	}
	227
	228	/* set current real-time position */
c7e0b5bf TI	229	int snd_seq_timer_set_position_time(struct snd_seq_timer *tmr,
c7e0b5bf TI	230	snd_seq_real_time_t position)
1da177e4 LT	231	{
	232	unsigned long flags;
	233
7eaa943c TI	234	if (snd_BUG_ON(!tmr))
7eaa943c TI	235	return -EINVAL;
1da177e4 LT	236
	237	snd_seq_sanity_real_time(&position);
	238	spin_lock_irqsave(&tmr->lock, flags);
	239	tmr->cur_time = position;
	240	spin_unlock_irqrestore(&tmr->lock, flags);
	241	return 0;
	242	}
	243
	244	/* set timer skew */
c7e0b5bf TI	245	int snd_seq_timer_set_skew(struct snd_seq_timer *tmr, unsigned int skew,
c7e0b5bf TI	246	unsigned int base)
1da177e4 LT	247	{
	248	unsigned long flags;
	249
7eaa943c TI	250	if (snd_BUG_ON(!tmr))
7eaa943c TI	251	return -EINVAL;
1da177e4 LT	252
	253	/* FIXME */
	254	if (base != SKEW_BASE) {
	255	snd_printd("invalid skew base 0x%x\n", base);
	256	return -EINVAL;
	257	}
	258	spin_lock_irqsave(&tmr->lock, flags);
	259	tmr->skew = skew;
	260	spin_unlock_irqrestore(&tmr->lock, flags);
	261	return 0;
	262	}
	263
c7e0b5bf	264	int snd_seq_timer_open(struct snd_seq_queue *q)
1da177e4	265	{
c7e0b5bf TI	266	struct snd_timer_instance *t;
c7e0b5bf TI	267	struct snd_seq_timer *tmr;
1da177e4 LT	268	char str[32];
	269	int err;
	270
	271	tmr = q->timer;
7eaa943c TI	272	if (snd_BUG_ON(!tmr))
7eaa943c TI	273	return -EINVAL;
1da177e4 LT	274	if (tmr->timeri)
	275	return -EBUSY;
	276	sprintf(str, "sequencer queue %i", q->queue);
	277	if (tmr->type != SNDRV_SEQ_TIMER_ALSA) /* standard ALSA timer */
	278	return -EINVAL;
	279	if (tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
	280	tmr->alsa_id.dev_sclass = SNDRV_TIMER_SCLASS_SEQUENCER;
	281	err = snd_timer_open(&t, str, &tmr->alsa_id, q->queue);
	282	if (err < 0 && tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_SLAVE) {
	283	if (tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_GLOBAL \|\|
	284	tmr->alsa_id.device != SNDRV_TIMER_GLOBAL_SYSTEM) {
c7e0b5bf	285	struct snd_timer_id tid;
1da177e4 LT	286	memset(&tid, 0, sizeof(tid));
	287	tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
	288	tid.dev_sclass = SNDRV_TIMER_SCLASS_SEQUENCER;
	289	tid.card = -1;
	290	tid.device = SNDRV_TIMER_GLOBAL_SYSTEM;
	291	err = snd_timer_open(&t, str, &tid, q->queue);
	292	}
	293	if (err < 0) {
	294	snd_printk(KERN_ERR "seq fatal error: cannot create timer (%i)\n", err);
	295	return err;
	296	}
	297	}
	298	t->callback = snd_seq_timer_interrupt;
	299	t->callback_data = q;
	300	t->flags \|= SNDRV_TIMER_IFLG_AUTO;
	301	tmr->timeri = t;
	302	return 0;
	303	}
	304
c7e0b5bf	305	int snd_seq_timer_close(struct snd_seq_queue *q)
1da177e4	306	{
c7e0b5bf	307	struct snd_seq_timer *tmr;
1da177e4 LT	308
1da177e4 LT	309	tmr = q->timer;
7eaa943c TI	310	if (snd_BUG_ON(!tmr))
7eaa943c TI	311	return -EINVAL;
1da177e4 LT	312	if (tmr->timeri) {
	313	snd_timer_stop(tmr->timeri);
	314	snd_timer_close(tmr->timeri);
	315	tmr->timeri = NULL;
	316	}
	317	return 0;
	318	}
	319
c7e0b5bf	320	int snd_seq_timer_stop(struct snd_seq_timer * tmr)
1da177e4 LT	321	{
	322	if (! tmr->timeri)
	323	return -EINVAL;
	324	if (!tmr->running)
	325	return 0;
	326	tmr->running = 0;
	327	snd_timer_pause(tmr->timeri);
	328	return 0;
	329	}
	330
c7e0b5bf	331	static int initialize_timer(struct snd_seq_timer *tmr)
1da177e4	332	{
c7e0b5bf	333	struct snd_timer *t;
87ef7779 CL	334	unsigned long freq;
87ef7779 CL	335
1da177e4	336	t = tmr->timeri->timer;
7eaa943c TI	337	if (snd_BUG_ON(!t))
7eaa943c TI	338	return -EINVAL;
1da177e4	339
87ef7779 CL	340	freq = tmr->preferred_resolution;
	341	if (!freq)
	342	freq = DEFAULT_FREQUENCY;
	343	else if (freq < MIN_FREQUENCY)
	344	freq = MIN_FREQUENCY;
	345	else if (freq > MAX_FREQUENCY)
	346	freq = MAX_FREQUENCY;
	347
1da177e4	348	tmr->ticks = 1;
87ef7779	349	if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1da177e4 LT	350	unsigned long r = t->hw.resolution;
	351	if (! r && t->hw.c_resolution)
	352	r = t->hw.c_resolution(t);
	353	if (r) {
87ef7779	354	tmr->ticks = (unsigned int)(1000000000uL / (r * freq));
1da177e4 LT	355	if (! tmr->ticks)
	356	tmr->ticks = 1;
	357	}
	358	}
	359	tmr->initialized = 1;
	360	return 0;
	361	}
	362
c7e0b5bf	363	int snd_seq_timer_start(struct snd_seq_timer * tmr)
1da177e4 LT	364	{
	365	if (! tmr->timeri)
	366	return -EINVAL;
	367	if (tmr->running)
	368	snd_seq_timer_stop(tmr);
	369	snd_seq_timer_reset(tmr);
	370	if (initialize_timer(tmr) < 0)
	371	return -EINVAL;
	372	snd_timer_start(tmr->timeri, tmr->ticks);
	373	tmr->running = 1;
	374	do_gettimeofday(&tmr->last_update);
	375	return 0;
	376	}
	377
c7e0b5bf	378	int snd_seq_timer_continue(struct snd_seq_timer * tmr)
1da177e4 LT	379	{
	380	if (! tmr->timeri)
	381	return -EINVAL;
	382	if (tmr->running)
	383	return -EBUSY;
	384	if (! tmr->initialized) {
	385	snd_seq_timer_reset(tmr);
	386	if (initialize_timer(tmr) < 0)
	387	return -EINVAL;
	388	}
	389	snd_timer_start(tmr->timeri, tmr->ticks);
	390	tmr->running = 1;
	391	do_gettimeofday(&tmr->last_update);
	392	return 0;
	393	}
	394
	395	/* return current 'real' time. use timeofday() to get better granularity. */
c7e0b5bf	396	snd_seq_real_time_t snd_seq_timer_get_cur_time(struct snd_seq_timer *tmr)
1da177e4 LT	397	{
	398	snd_seq_real_time_t cur_time;
	399
	400	cur_time = tmr->cur_time;
	401	if (tmr->running) {
	402	struct timeval tm;
	403	int usec;
	404	do_gettimeofday(&tm);
	405	usec = (int)(tm.tv_usec - tmr->last_update.tv_usec);
	406	if (usec < 0) {
	407	cur_time.tv_nsec += (1000000 + usec) * 1000;
	408	cur_time.tv_sec += tm.tv_sec - tmr->last_update.tv_sec - 1;
	409	} else {
	410	cur_time.tv_nsec += usec * 1000;
	411	cur_time.tv_sec += tm.tv_sec - tmr->last_update.tv_sec;
	412	}
	413	snd_seq_sanity_real_time(&cur_time);
	414	}
	415
	416	return cur_time;
	417	}
	418
	419	/* TODO: use interpolation on tick queue (will only be useful for very
	420	high PPQ values) */
c7e0b5bf	421	snd_seq_tick_time_t snd_seq_timer_get_cur_tick(struct snd_seq_timer *tmr)
1da177e4 LT	422	{
	423	return tmr->tick.cur_tick;
	424	}
	425
	426
04f141a8	427	#ifdef CONFIG_PROC_FS
1da177e4	428	/* exported to seq_info.c */
c7e0b5bf TI	429	void snd_seq_info_timer_read(struct snd_info_entry *entry,
c7e0b5bf TI	430	struct snd_info_buffer *buffer)
1da177e4 LT	431	{
1da177e4 LT	432	int idx;
c7e0b5bf TI	433	struct snd_seq_queue *q;
	434	struct snd_seq_timer *tmr;
	435	struct snd_timer_instance *ti;
1da177e4 LT	436	unsigned long resolution;
	437
	438	for (idx = 0; idx < SNDRV_SEQ_MAX_QUEUES; idx++) {
	439	q = queueptr(idx);
	440	if (q == NULL)
	441	continue;
	442	if ((tmr = q->timer) == NULL \|\|
	443	(ti = tmr->timeri) == NULL) {
	444	queuefree(q);
	445	continue;
	446	}
	447	snd_iprintf(buffer, "Timer for queue %i : %s\n", q->queue, ti->timer->name);
	448	resolution = snd_timer_resolution(ti) * tmr->ticks;
	449	snd_iprintf(buffer, " Period time : %lu.%09lu\n", resolution / 1000000000, resolution % 1000000000);
	450	snd_iprintf(buffer, " Skew : %u / %u\n", tmr->skew, tmr->skew_base);
	451	queuefree(q);
	452	}
	453	}
04f141a8 TI	454	#endif /* CONFIG_PROC_FS */
04f141a8 TI	455