[deliverable/linux.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)
		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) {
		pr_debug("ALSA: seq: 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);
		pr_debug("ALSA: 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) {
		pr_debug("ALSA: seq: 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) {
		pr_err("ALSA: 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_SND_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_SND_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);
24db8bba	59	if (!tmr)
1da177e4	60	return NULL;
1da177e4 LT	61	spin_lock_init(&tmr->lock);
	62
	63	/* reset setup to defaults */
	64	snd_seq_timer_defaults(tmr);
	65
	66	/* reset time */
	67	snd_seq_timer_reset(tmr);
	68
	69	return tmr;
	70	}
	71
	72	/* delete timer (destructor) */
c7e0b5bf	73	void snd_seq_timer_delete(struct snd_seq_timer **tmr)
1da177e4	74	{
c7e0b5bf	75	struct snd_seq_timer t = tmr;
1da177e4 LT	76	*tmr = NULL;
	77
	78	if (t == NULL) {
04cc79a0	79	pr_debug("ALSA: seq: snd_seq_timer_delete() called with NULL timer\n");
1da177e4 LT	80	return;
	81	}
	82	t->running = 0;
	83
	84	/* reset time */
	85	snd_seq_timer_stop(t);
	86	snd_seq_timer_reset(t);
	87
	88	kfree(t);
	89	}
	90
c7e0b5bf	91	void snd_seq_timer_defaults(struct snd_seq_timer * tmr)
1da177e4 LT	92	{
	93	/* setup defaults */
	94	tmr->ppq = 96; /* 96 PPQ */
	95	tmr->tempo = 500000; /* 120 BPM */
a32f6674	96	snd_seq_timer_set_tick_resolution(tmr);
1da177e4 LT	97	tmr->running = 0;
	98
	99	tmr->type = SNDRV_SEQ_TIMER_ALSA;
	100	tmr->alsa_id.dev_class = seq_default_timer_class;
	101	tmr->alsa_id.dev_sclass = seq_default_timer_sclass;
	102	tmr->alsa_id.card = seq_default_timer_card;
	103	tmr->alsa_id.device = seq_default_timer_device;
	104	tmr->alsa_id.subdevice = seq_default_timer_subdevice;
	105	tmr->preferred_resolution = seq_default_timer_resolution;
	106
	107	tmr->skew = tmr->skew_base = SKEW_BASE;
	108	}
	109
c7e0b5bf	110	void snd_seq_timer_reset(struct snd_seq_timer * tmr)
1da177e4 LT	111	{
	112	unsigned long flags;
	113
	114	spin_lock_irqsave(&tmr->lock, flags);
	115
	116	/* reset time & songposition */
	117	tmr->cur_time.tv_sec = 0;
	118	tmr->cur_time.tv_nsec = 0;
	119
	120	tmr->tick.cur_tick = 0;
	121	tmr->tick.fraction = 0;
	122
	123	spin_unlock_irqrestore(&tmr->lock, flags);
	124	}
	125
	126
	127	/* called by timer interrupt routine. the period time since previous invocation is passed */
c7e0b5bf	128	static void snd_seq_timer_interrupt(struct snd_timer_instance *timeri,
1da177e4 LT	129	unsigned long resolution,
	130	unsigned long ticks)
	131	{
	132	unsigned long flags;
c7e0b5bf TI	133	struct snd_seq_queue *q = timeri->callback_data;
c7e0b5bf TI	134	struct snd_seq_timer *tmr;
1da177e4 LT	135
	136	if (q == NULL)
	137	return;
	138	tmr = q->timer;
	139	if (tmr == NULL)
	140	return;
	141	if (!tmr->running)
	142	return;
	143
	144	resolution *= ticks;
	145	if (tmr->skew != tmr->skew_base) {
	146	/* FIXME: assuming skew_base = 0x10000 */
	147	resolution = (resolution >> 16) * tmr->skew +
	148	(((resolution & 0xffff) * tmr->skew) >> 16);
	149	}
	150
	151	spin_lock_irqsave(&tmr->lock, flags);
	152
	153	/* update timer */
	154	snd_seq_inc_time_nsec(&tmr->cur_time, resolution);
	155
	156	/* calculate current tick */
	157	snd_seq_timer_update_tick(&tmr->tick, resolution);
	158
	159	/* register actual time of this timer update */
	160	do_gettimeofday(&tmr->last_update);
	161
	162	spin_unlock_irqrestore(&tmr->lock, flags);
	163
	164	/* check queues and dispatch events */
	165	snd_seq_check_queue(q, 1, 0);
	166	}
	167
	168	/* set current tempo */
c7e0b5bf	169	int snd_seq_timer_set_tempo(struct snd_seq_timer * tmr, int tempo)
1da177e4 LT	170	{
	171	unsigned long flags;
	172
7eaa943c TI	173	if (snd_BUG_ON(!tmr))
7eaa943c TI	174	return -EINVAL;
1da177e4 LT	175	if (tempo <= 0)
	176	return -EINVAL;
	177	spin_lock_irqsave(&tmr->lock, flags);
	178	if ((unsigned int)tempo != tmr->tempo) {
	179	tmr->tempo = tempo;
a32f6674	180	snd_seq_timer_set_tick_resolution(tmr);
1da177e4 LT	181	}
	182	spin_unlock_irqrestore(&tmr->lock, flags);
	183	return 0;
	184	}
	185
	186	/* set current ppq */
c7e0b5bf	187	int snd_seq_timer_set_ppq(struct snd_seq_timer * tmr, int ppq)
1da177e4 LT	188	{
	189	unsigned long flags;
	190
7eaa943c TI	191	if (snd_BUG_ON(!tmr))
7eaa943c TI	192	return -EINVAL;
1da177e4 LT	193	if (ppq <= 0)
	194	return -EINVAL;
	195	spin_lock_irqsave(&tmr->lock, flags);
	196	if (tmr->running && (ppq != tmr->ppq)) {
	197	/* refuse to change ppq on running timers */
	198	/* because it will upset the song position (ticks) */
	199	spin_unlock_irqrestore(&tmr->lock, flags);
04cc79a0	200	pr_debug("ALSA: seq: cannot change ppq of a running timer\n");
1da177e4 LT	201	return -EBUSY;
	202	}
	203
	204	tmr->ppq = ppq;
a32f6674	205	snd_seq_timer_set_tick_resolution(tmr);
1da177e4 LT	206	spin_unlock_irqrestore(&tmr->lock, flags);
	207	return 0;
	208	}
	209
	210	/* set current tick position */
c7e0b5bf TI	211	int snd_seq_timer_set_position_tick(struct snd_seq_timer *tmr,
c7e0b5bf TI	212	snd_seq_tick_time_t position)
1da177e4 LT	213	{
	214	unsigned long flags;
	215
7eaa943c TI	216	if (snd_BUG_ON(!tmr))
7eaa943c TI	217	return -EINVAL;
1da177e4 LT	218
	219	spin_lock_irqsave(&tmr->lock, flags);
	220	tmr->tick.cur_tick = position;
	221	tmr->tick.fraction = 0;
	222	spin_unlock_irqrestore(&tmr->lock, flags);
	223	return 0;
	224	}
	225
	226	/* set current real-time position */
c7e0b5bf TI	227	int snd_seq_timer_set_position_time(struct snd_seq_timer *tmr,
c7e0b5bf TI	228	snd_seq_real_time_t position)
1da177e4 LT	229	{
	230	unsigned long flags;
	231
7eaa943c TI	232	if (snd_BUG_ON(!tmr))
7eaa943c TI	233	return -EINVAL;
1da177e4 LT	234
	235	snd_seq_sanity_real_time(&position);
	236	spin_lock_irqsave(&tmr->lock, flags);
	237	tmr->cur_time = position;
	238	spin_unlock_irqrestore(&tmr->lock, flags);
	239	return 0;
	240	}
	241
	242	/* set timer skew */
c7e0b5bf TI	243	int snd_seq_timer_set_skew(struct snd_seq_timer *tmr, unsigned int skew,
c7e0b5bf TI	244	unsigned int base)
1da177e4 LT	245	{
	246	unsigned long flags;
	247
7eaa943c TI	248	if (snd_BUG_ON(!tmr))
7eaa943c TI	249	return -EINVAL;
1da177e4 LT	250
	251	/* FIXME */
	252	if (base != SKEW_BASE) {
04cc79a0	253	pr_debug("ALSA: seq: invalid skew base 0x%x\n", base);
1da177e4 LT	254	return -EINVAL;
	255	}
	256	spin_lock_irqsave(&tmr->lock, flags);
	257	tmr->skew = skew;
	258	spin_unlock_irqrestore(&tmr->lock, flags);
	259	return 0;
	260	}
	261
c7e0b5bf	262	int snd_seq_timer_open(struct snd_seq_queue *q)
1da177e4	263	{
c7e0b5bf TI	264	struct snd_timer_instance *t;
c7e0b5bf TI	265	struct snd_seq_timer *tmr;
1da177e4 LT	266	char str[32];
	267	int err;
	268
	269	tmr = q->timer;
7eaa943c TI	270	if (snd_BUG_ON(!tmr))
7eaa943c TI	271	return -EINVAL;
1da177e4 LT	272	if (tmr->timeri)
	273	return -EBUSY;
	274	sprintf(str, "sequencer queue %i", q->queue);
	275	if (tmr->type != SNDRV_SEQ_TIMER_ALSA) /* standard ALSA timer */
	276	return -EINVAL;
	277	if (tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
	278	tmr->alsa_id.dev_sclass = SNDRV_TIMER_SCLASS_SEQUENCER;
	279	err = snd_timer_open(&t, str, &tmr->alsa_id, q->queue);
	280	if (err < 0 && tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_SLAVE) {
	281	if (tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_GLOBAL \|\|
	282	tmr->alsa_id.device != SNDRV_TIMER_GLOBAL_SYSTEM) {
c7e0b5bf	283	struct snd_timer_id tid;
1da177e4 LT	284	memset(&tid, 0, sizeof(tid));
	285	tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
	286	tid.dev_sclass = SNDRV_TIMER_SCLASS_SEQUENCER;
	287	tid.card = -1;
	288	tid.device = SNDRV_TIMER_GLOBAL_SYSTEM;
	289	err = snd_timer_open(&t, str, &tid, q->queue);
	290	}
66efdc71 TI	291	}
66efdc71 TI	292	if (err < 0) {
04cc79a0	293	pr_err("ALSA: seq fatal error: cannot create timer (%i)\n", err);
66efdc71	294	return err;
1da177e4 LT	295	}
	296	t->callback = snd_seq_timer_interrupt;
	297	t->callback_data = q;
	298	t->flags \|= SNDRV_TIMER_IFLG_AUTO;
	299	tmr->timeri = t;
	300	return 0;
	301	}
	302
c7e0b5bf	303	int snd_seq_timer_close(struct snd_seq_queue *q)
1da177e4	304	{
c7e0b5bf	305	struct snd_seq_timer *tmr;
1da177e4 LT	306
1da177e4 LT	307	tmr = q->timer;
7eaa943c TI	308	if (snd_BUG_ON(!tmr))
7eaa943c TI	309	return -EINVAL;
1da177e4 LT	310	if (tmr->timeri) {
	311	snd_timer_stop(tmr->timeri);
	312	snd_timer_close(tmr->timeri);
	313	tmr->timeri = NULL;
	314	}
	315	return 0;
	316	}
	317
c7e0b5bf	318	int snd_seq_timer_stop(struct snd_seq_timer * tmr)
1da177e4 LT	319	{
	320	if (! tmr->timeri)
	321	return -EINVAL;
	322	if (!tmr->running)
	323	return 0;
	324	tmr->running = 0;
	325	snd_timer_pause(tmr->timeri);
	326	return 0;
	327	}
	328
c7e0b5bf	329	static int initialize_timer(struct snd_seq_timer *tmr)
1da177e4	330	{
c7e0b5bf	331	struct snd_timer *t;
87ef7779 CL	332	unsigned long freq;
87ef7779 CL	333
1da177e4	334	t = tmr->timeri->timer;
7eaa943c TI	335	if (snd_BUG_ON(!t))
7eaa943c TI	336	return -EINVAL;
1da177e4	337
87ef7779 CL	338	freq = tmr->preferred_resolution;
	339	if (!freq)
	340	freq = DEFAULT_FREQUENCY;
	341	else if (freq < MIN_FREQUENCY)
	342	freq = MIN_FREQUENCY;
	343	else if (freq > MAX_FREQUENCY)
	344	freq = MAX_FREQUENCY;
	345
1da177e4	346	tmr->ticks = 1;
87ef7779	347	if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1da177e4 LT	348	unsigned long r = t->hw.resolution;
	349	if (! r && t->hw.c_resolution)
	350	r = t->hw.c_resolution(t);
	351	if (r) {
87ef7779	352	tmr->ticks = (unsigned int)(1000000000uL / (r * freq));
1da177e4 LT	353	if (! tmr->ticks)
	354	tmr->ticks = 1;
	355	}
	356	}
	357	tmr->initialized = 1;
	358	return 0;
	359	}
	360
c7e0b5bf	361	int snd_seq_timer_start(struct snd_seq_timer * tmr)
1da177e4 LT	362	{
	363	if (! tmr->timeri)
	364	return -EINVAL;
	365	if (tmr->running)
	366	snd_seq_timer_stop(tmr);
	367	snd_seq_timer_reset(tmr);
	368	if (initialize_timer(tmr) < 0)
	369	return -EINVAL;
	370	snd_timer_start(tmr->timeri, tmr->ticks);
	371	tmr->running = 1;
	372	do_gettimeofday(&tmr->last_update);
	373	return 0;
	374	}
	375
c7e0b5bf	376	int snd_seq_timer_continue(struct snd_seq_timer * tmr)
1da177e4 LT	377	{
	378	if (! tmr->timeri)
	379	return -EINVAL;
	380	if (tmr->running)
	381	return -EBUSY;
	382	if (! tmr->initialized) {
	383	snd_seq_timer_reset(tmr);
	384	if (initialize_timer(tmr) < 0)
	385	return -EINVAL;
	386	}
	387	snd_timer_start(tmr->timeri, tmr->ticks);
	388	tmr->running = 1;
	389	do_gettimeofday(&tmr->last_update);
	390	return 0;
	391	}
	392
	393	/* return current 'real' time. use timeofday() to get better granularity. */
c7e0b5bf	394	snd_seq_real_time_t snd_seq_timer_get_cur_time(struct snd_seq_timer *tmr)
1da177e4 LT	395	{
	396	snd_seq_real_time_t cur_time;
	397
	398	cur_time = tmr->cur_time;
	399	if (tmr->running) {
	400	struct timeval tm;
	401	int usec;
	402	do_gettimeofday(&tm);
	403	usec = (int)(tm.tv_usec - tmr->last_update.tv_usec);
	404	if (usec < 0) {
	405	cur_time.tv_nsec += (1000000 + usec) * 1000;
	406	cur_time.tv_sec += tm.tv_sec - tmr->last_update.tv_sec - 1;
	407	} else {
	408	cur_time.tv_nsec += usec * 1000;
	409	cur_time.tv_sec += tm.tv_sec - tmr->last_update.tv_sec;
	410	}
	411	snd_seq_sanity_real_time(&cur_time);
	412	}
	413
	414	return cur_time;
	415	}
	416
	417	/* TODO: use interpolation on tick queue (will only be useful for very
	418	high PPQ values) */
c7e0b5bf	419	snd_seq_tick_time_t snd_seq_timer_get_cur_tick(struct snd_seq_timer *tmr)
1da177e4 LT	420	{
	421	return tmr->tick.cur_tick;
	422	}
	423
	424
cd6a6503	425	#ifdef CONFIG_SND_PROC_FS
1da177e4	426	/* exported to seq_info.c */
c7e0b5bf TI	427	void snd_seq_info_timer_read(struct snd_info_entry *entry,
c7e0b5bf TI	428	struct snd_info_buffer *buffer)
1da177e4 LT	429	{
1da177e4 LT	430	int idx;
c7e0b5bf TI	431	struct snd_seq_queue *q;
	432	struct snd_seq_timer *tmr;
	433	struct snd_timer_instance *ti;
1da177e4 LT	434	unsigned long resolution;
	435
	436	for (idx = 0; idx < SNDRV_SEQ_MAX_QUEUES; idx++) {
	437	q = queueptr(idx);
	438	if (q == NULL)
	439	continue;
	440	if ((tmr = q->timer) == NULL \|\|
	441	(ti = tmr->timeri) == NULL) {
	442	queuefree(q);
	443	continue;
	444	}
	445	snd_iprintf(buffer, "Timer for queue %i : %s\n", q->queue, ti->timer->name);
	446	resolution = snd_timer_resolution(ti) * tmr->ticks;
	447	snd_iprintf(buffer, " Period time : %lu.%09lu\n", resolution / 1000000000, resolution % 1000000000);
	448	snd_iprintf(buffer, " Skew : %u / %u\n", tmr->skew, tmr->skew_base);
	449	queuefree(q);
	450	}
	451	}
cd6a6503	452	#endif /* CONFIG_SND_PROC_FS */
04f141a8	453