[mirror_ubuntu-zesty-kernel.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)
{
	unsigned long flags;

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

static void seq_timer_reset(struct snd_seq_timer *tmr)
{
	/* reset time & songposition */
	tmr->cur_time.tv_sec = 0;
	tmr->cur_time.tv_nsec = 0;

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

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

	spin_lock_irqsave(&tmr->lock, flags);
	seq_timer_reset(tmr);
	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;
	spin_lock_irqsave(&tmr->lock, flags);
	if (!tmr->running) {
		spin_unlock_irqrestore(&tmr->lock, flags);
		return;
	}

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

	/* 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;
	spin_lock_irq(&tmr->lock);
	tmr->timeri = t;
	spin_unlock_irq(&tmr->lock);
	return 0;
}

int snd_seq_timer_close(struct snd_seq_queue *q)
{
	struct snd_seq_timer *tmr;
	struct snd_timer_instance *t;
	
	tmr = q->timer;
	if (snd_BUG_ON(!tmr))
		return -EINVAL;
	spin_lock_irq(&tmr->lock);
	t = tmr->timeri;
	tmr->timeri = NULL;
	spin_unlock_irq(&tmr->lock);
	if (t)
		snd_timer_close(t);
	return 0;
}

static int 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;
}

int snd_seq_timer_stop(struct snd_seq_timer *tmr)
{
	unsigned long flags;
	int err;

	spin_lock_irqsave(&tmr->lock, flags);
	err = seq_timer_stop(tmr);
	spin_unlock_irqrestore(&tmr->lock, flags);
	return err;
}

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;
}

static int seq_timer_start(struct snd_seq_timer *tmr)
{
	if (! tmr->timeri)
		return -EINVAL;
	if (tmr->running)
		seq_timer_stop(tmr);
	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_start(struct snd_seq_timer *tmr)
{
	unsigned long flags;
	int err;

	spin_lock_irqsave(&tmr->lock, flags);
	err = seq_timer_start(tmr);
	spin_unlock_irqrestore(&tmr->lock, flags);
	return err;
}

static int seq_timer_continue(struct snd_seq_timer *tmr)
{
	if (! tmr->timeri)
		return -EINVAL;
	if (tmr->running)
		return -EBUSY;
	if (! tmr->initialized) {
		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)
{
	unsigned long flags;
	int err;

	spin_lock_irqsave(&tmr->lock, flags);
	err = seq_timer_continue(tmr);
	spin_unlock_irqrestore(&tmr->lock, flags);
	return err;
}

/* 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;
	unsigned long flags;

	spin_lock_irqsave(&tmr->lock, flags);
	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);
	}
	spin_unlock_irqrestore(&tmr->lock, flags);
	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	92	{
2cdc7b63 TI	93	unsigned long flags;
	94
	95	spin_lock_irqsave(&tmr->lock, flags);
1da177e4 LT	96	/* setup defaults */
	97	tmr->ppq = 96; /* 96 PPQ */
	98	tmr->tempo = 500000; /* 120 BPM */
a32f6674	99	snd_seq_timer_set_tick_resolution(tmr);
1da177e4 LT	100	tmr->running = 0;
	101
	102	tmr->type = SNDRV_SEQ_TIMER_ALSA;
	103	tmr->alsa_id.dev_class = seq_default_timer_class;
	104	tmr->alsa_id.dev_sclass = seq_default_timer_sclass;
	105	tmr->alsa_id.card = seq_default_timer_card;
	106	tmr->alsa_id.device = seq_default_timer_device;
	107	tmr->alsa_id.subdevice = seq_default_timer_subdevice;
	108	tmr->preferred_resolution = seq_default_timer_resolution;
	109
	110	tmr->skew = tmr->skew_base = SKEW_BASE;
2cdc7b63	111	spin_unlock_irqrestore(&tmr->lock, flags);
1da177e4 LT	112	}
1da177e4 LT	113
2cdc7b63	114	static void seq_timer_reset(struct snd_seq_timer *tmr)
1da177e4	115	{
1da177e4 LT	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;
2cdc7b63 TI	122	}
	123
	124	void snd_seq_timer_reset(struct snd_seq_timer *tmr)
	125	{
	126	unsigned long flags;
1da177e4	127
2cdc7b63 TI	128	spin_lock_irqsave(&tmr->lock, flags);
2cdc7b63 TI	129	seq_timer_reset(tmr);
1da177e4 LT	130	spin_unlock_irqrestore(&tmr->lock, flags);
	131	}
	132
	133
	134	/* called by timer interrupt routine. the period time since previous invocation is passed */
c7e0b5bf	135	static void snd_seq_timer_interrupt(struct snd_timer_instance *timeri,
1da177e4 LT	136	unsigned long resolution,
	137	unsigned long ticks)
	138	{
	139	unsigned long flags;
c7e0b5bf TI	140	struct snd_seq_queue *q = timeri->callback_data;
c7e0b5bf TI	141	struct snd_seq_timer *tmr;
1da177e4 LT	142
	143	if (q == NULL)
	144	return;
	145	tmr = q->timer;
	146	if (tmr == NULL)
	147	return;
2cdc7b63 TI	148	spin_lock_irqsave(&tmr->lock, flags);
	149	if (!tmr->running) {
	150	spin_unlock_irqrestore(&tmr->lock, flags);
1da177e4	151	return;
2cdc7b63	152	}
1da177e4 LT	153
	154	resolution *= ticks;
	155	if (tmr->skew != tmr->skew_base) {
	156	/* FIXME: assuming skew_base = 0x10000 */
	157	resolution = (resolution >> 16) * tmr->skew +
	158	(((resolution & 0xffff) * tmr->skew) >> 16);
	159	}
	160
1da177e4 LT	161	/* update timer */
	162	snd_seq_inc_time_nsec(&tmr->cur_time, resolution);
	163
	164	/* calculate current tick */
	165	snd_seq_timer_update_tick(&tmr->tick, resolution);
	166
	167	/* register actual time of this timer update */
	168	do_gettimeofday(&tmr->last_update);
	169
	170	spin_unlock_irqrestore(&tmr->lock, flags);
	171
	172	/* check queues and dispatch events */
	173	snd_seq_check_queue(q, 1, 0);
	174	}
	175
	176	/* set current tempo */
c7e0b5bf	177	int snd_seq_timer_set_tempo(struct snd_seq_timer * tmr, int tempo)
1da177e4 LT	178	{
	179	unsigned long flags;
	180
7eaa943c TI	181	if (snd_BUG_ON(!tmr))
7eaa943c TI	182	return -EINVAL;
1da177e4 LT	183	if (tempo <= 0)
	184	return -EINVAL;
	185	spin_lock_irqsave(&tmr->lock, flags);
	186	if ((unsigned int)tempo != tmr->tempo) {
	187	tmr->tempo = tempo;
a32f6674	188	snd_seq_timer_set_tick_resolution(tmr);
1da177e4 LT	189	}
	190	spin_unlock_irqrestore(&tmr->lock, flags);
	191	return 0;
	192	}
	193
	194	/* set current ppq */
c7e0b5bf	195	int snd_seq_timer_set_ppq(struct snd_seq_timer * tmr, int ppq)
1da177e4 LT	196	{
	197	unsigned long flags;
	198
7eaa943c TI	199	if (snd_BUG_ON(!tmr))
7eaa943c TI	200	return -EINVAL;
1da177e4 LT	201	if (ppq <= 0)
	202	return -EINVAL;
	203	spin_lock_irqsave(&tmr->lock, flags);
	204	if (tmr->running && (ppq != tmr->ppq)) {
	205	/* refuse to change ppq on running timers */
	206	/* because it will upset the song position (ticks) */
	207	spin_unlock_irqrestore(&tmr->lock, flags);
04cc79a0	208	pr_debug("ALSA: seq: cannot change ppq of a running timer\n");
1da177e4 LT	209	return -EBUSY;
	210	}
	211
	212	tmr->ppq = ppq;
a32f6674	213	snd_seq_timer_set_tick_resolution(tmr);
1da177e4 LT	214	spin_unlock_irqrestore(&tmr->lock, flags);
	215	return 0;
	216	}
	217
	218	/* set current tick position */
c7e0b5bf TI	219	int snd_seq_timer_set_position_tick(struct snd_seq_timer *tmr,
c7e0b5bf TI	220	snd_seq_tick_time_t position)
1da177e4 LT	221	{
	222	unsigned long flags;
	223
7eaa943c TI	224	if (snd_BUG_ON(!tmr))
7eaa943c TI	225	return -EINVAL;
1da177e4 LT	226
	227	spin_lock_irqsave(&tmr->lock, flags);
	228	tmr->tick.cur_tick = position;
	229	tmr->tick.fraction = 0;
	230	spin_unlock_irqrestore(&tmr->lock, flags);
	231	return 0;
	232	}
	233
	234	/* set current real-time position */
c7e0b5bf TI	235	int snd_seq_timer_set_position_time(struct snd_seq_timer *tmr,
c7e0b5bf TI	236	snd_seq_real_time_t position)
1da177e4 LT	237	{
	238	unsigned long flags;
	239
7eaa943c TI	240	if (snd_BUG_ON(!tmr))
7eaa943c TI	241	return -EINVAL;
1da177e4 LT	242
	243	snd_seq_sanity_real_time(&position);
	244	spin_lock_irqsave(&tmr->lock, flags);
	245	tmr->cur_time = position;
	246	spin_unlock_irqrestore(&tmr->lock, flags);
	247	return 0;
	248	}
	249
	250	/* set timer skew */
c7e0b5bf TI	251	int snd_seq_timer_set_skew(struct snd_seq_timer *tmr, unsigned int skew,
c7e0b5bf TI	252	unsigned int base)
1da177e4 LT	253	{
	254	unsigned long flags;
	255
7eaa943c TI	256	if (snd_BUG_ON(!tmr))
7eaa943c TI	257	return -EINVAL;
1da177e4 LT	258
	259	/* FIXME */
	260	if (base != SKEW_BASE) {
04cc79a0	261	pr_debug("ALSA: seq: invalid skew base 0x%x\n", base);
1da177e4 LT	262	return -EINVAL;
	263	}
	264	spin_lock_irqsave(&tmr->lock, flags);
	265	tmr->skew = skew;
	266	spin_unlock_irqrestore(&tmr->lock, flags);
	267	return 0;
	268	}
	269
c7e0b5bf	270	int snd_seq_timer_open(struct snd_seq_queue *q)
1da177e4	271	{
c7e0b5bf TI	272	struct snd_timer_instance *t;
c7e0b5bf TI	273	struct snd_seq_timer *tmr;
1da177e4 LT	274	char str[32];
	275	int err;
	276
	277	tmr = q->timer;
7eaa943c TI	278	if (snd_BUG_ON(!tmr))
7eaa943c TI	279	return -EINVAL;
1da177e4 LT	280	if (tmr->timeri)
	281	return -EBUSY;
	282	sprintf(str, "sequencer queue %i", q->queue);
	283	if (tmr->type != SNDRV_SEQ_TIMER_ALSA) /* standard ALSA timer */
	284	return -EINVAL;
	285	if (tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
	286	tmr->alsa_id.dev_sclass = SNDRV_TIMER_SCLASS_SEQUENCER;
	287	err = snd_timer_open(&t, str, &tmr->alsa_id, q->queue);
	288	if (err < 0 && tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_SLAVE) {
	289	if (tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_GLOBAL \|\|
	290	tmr->alsa_id.device != SNDRV_TIMER_GLOBAL_SYSTEM) {
c7e0b5bf	291	struct snd_timer_id tid;
1da177e4 LT	292	memset(&tid, 0, sizeof(tid));
	293	tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
	294	tid.dev_sclass = SNDRV_TIMER_SCLASS_SEQUENCER;
	295	tid.card = -1;
	296	tid.device = SNDRV_TIMER_GLOBAL_SYSTEM;
	297	err = snd_timer_open(&t, str, &tid, q->queue);
	298	}
66efdc71 TI	299	}
66efdc71 TI	300	if (err < 0) {
04cc79a0	301	pr_err("ALSA: seq fatal error: cannot create timer (%i)\n", err);
66efdc71	302	return err;
1da177e4 LT	303	}
	304	t->callback = snd_seq_timer_interrupt;
	305	t->callback_data = q;
	306	t->flags \|= SNDRV_TIMER_IFLG_AUTO;
2cdc7b63	307	spin_lock_irq(&tmr->lock);
1da177e4	308	tmr->timeri = t;
2cdc7b63	309	spin_unlock_irq(&tmr->lock);
1da177e4 LT	310	return 0;
	311	}
	312
c7e0b5bf	313	int snd_seq_timer_close(struct snd_seq_queue *q)
1da177e4	314	{
c7e0b5bf	315	struct snd_seq_timer *tmr;
2cdc7b63	316	struct snd_timer_instance *t;
1da177e4 LT	317
1da177e4 LT	318	tmr = q->timer;
7eaa943c TI	319	if (snd_BUG_ON(!tmr))
7eaa943c TI	320	return -EINVAL;
2cdc7b63 TI	321	spin_lock_irq(&tmr->lock);
	322	t = tmr->timeri;
	323	tmr->timeri = NULL;
	324	spin_unlock_irq(&tmr->lock);
	325	if (t)
	326	snd_timer_close(t);
1da177e4 LT	327	return 0;
	328	}
	329
2cdc7b63	330	static int seq_timer_stop(struct snd_seq_timer *tmr)
1da177e4 LT	331	{
	332	if (! tmr->timeri)
	333	return -EINVAL;
	334	if (!tmr->running)
	335	return 0;
	336	tmr->running = 0;
	337	snd_timer_pause(tmr->timeri);
	338	return 0;
	339	}
	340
2cdc7b63 TI	341	int snd_seq_timer_stop(struct snd_seq_timer *tmr)
	342	{
	343	unsigned long flags;
	344	int err;
	345
	346	spin_lock_irqsave(&tmr->lock, flags);
	347	err = seq_timer_stop(tmr);
	348	spin_unlock_irqrestore(&tmr->lock, flags);
	349	return err;
	350	}
	351
c7e0b5bf	352	static int initialize_timer(struct snd_seq_timer *tmr)
1da177e4	353	{
c7e0b5bf	354	struct snd_timer *t;
87ef7779 CL	355	unsigned long freq;
87ef7779 CL	356
1da177e4	357	t = tmr->timeri->timer;
7eaa943c TI	358	if (snd_BUG_ON(!t))
7eaa943c TI	359	return -EINVAL;
1da177e4	360
87ef7779 CL	361	freq = tmr->preferred_resolution;
	362	if (!freq)
	363	freq = DEFAULT_FREQUENCY;
	364	else if (freq < MIN_FREQUENCY)
	365	freq = MIN_FREQUENCY;
	366	else if (freq > MAX_FREQUENCY)
	367	freq = MAX_FREQUENCY;
	368
1da177e4	369	tmr->ticks = 1;
87ef7779	370	if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1da177e4 LT	371	unsigned long r = t->hw.resolution;
	372	if (! r && t->hw.c_resolution)
	373	r = t->hw.c_resolution(t);
	374	if (r) {
87ef7779	375	tmr->ticks = (unsigned int)(1000000000uL / (r * freq));
1da177e4 LT	376	if (! tmr->ticks)
	377	tmr->ticks = 1;
	378	}
	379	}
	380	tmr->initialized = 1;
	381	return 0;
	382	}
	383
2cdc7b63	384	static int seq_timer_start(struct snd_seq_timer *tmr)
1da177e4 LT	385	{
	386	if (! tmr->timeri)
	387	return -EINVAL;
	388	if (tmr->running)
2cdc7b63 TI	389	seq_timer_stop(tmr);
2cdc7b63 TI	390	seq_timer_reset(tmr);
1da177e4 LT	391	if (initialize_timer(tmr) < 0)
	392	return -EINVAL;
	393	snd_timer_start(tmr->timeri, tmr->ticks);
	394	tmr->running = 1;
	395	do_gettimeofday(&tmr->last_update);
	396	return 0;
	397	}
	398
2cdc7b63 TI	399	int snd_seq_timer_start(struct snd_seq_timer *tmr)
	400	{
	401	unsigned long flags;
	402	int err;
	403
	404	spin_lock_irqsave(&tmr->lock, flags);
	405	err = seq_timer_start(tmr);
	406	spin_unlock_irqrestore(&tmr->lock, flags);
	407	return err;
	408	}
	409
	410	static int seq_timer_continue(struct snd_seq_timer *tmr)
1da177e4 LT	411	{
	412	if (! tmr->timeri)
	413	return -EINVAL;
	414	if (tmr->running)
	415	return -EBUSY;
	416	if (! tmr->initialized) {
2cdc7b63	417	seq_timer_reset(tmr);
1da177e4 LT	418	if (initialize_timer(tmr) < 0)
	419	return -EINVAL;
	420	}
	421	snd_timer_start(tmr->timeri, tmr->ticks);
	422	tmr->running = 1;
	423	do_gettimeofday(&tmr->last_update);
	424	return 0;
	425	}
	426
2cdc7b63 TI	427	int snd_seq_timer_continue(struct snd_seq_timer *tmr)
	428	{
	429	unsigned long flags;
	430	int err;
	431
	432	spin_lock_irqsave(&tmr->lock, flags);
	433	err = seq_timer_continue(tmr);
	434	spin_unlock_irqrestore(&tmr->lock, flags);
	435	return err;
	436	}
	437
1da177e4	438	/* return current 'real' time. use timeofday() to get better granularity. */
c7e0b5bf	439	snd_seq_real_time_t snd_seq_timer_get_cur_time(struct snd_seq_timer *tmr)
1da177e4 LT	440	{
1da177e4 LT	441	snd_seq_real_time_t cur_time;
2cdc7b63	442	unsigned long flags;
1da177e4	443
2cdc7b63	444	spin_lock_irqsave(&tmr->lock, flags);
1da177e4 LT	445	cur_time = tmr->cur_time;
	446	if (tmr->running) {
	447	struct timeval tm;
	448	int usec;
	449	do_gettimeofday(&tm);
	450	usec = (int)(tm.tv_usec - tmr->last_update.tv_usec);
	451	if (usec < 0) {
	452	cur_time.tv_nsec += (1000000 + usec) * 1000;
	453	cur_time.tv_sec += tm.tv_sec - tmr->last_update.tv_sec - 1;
	454	} else {
	455	cur_time.tv_nsec += usec * 1000;
	456	cur_time.tv_sec += tm.tv_sec - tmr->last_update.tv_sec;
	457	}
	458	snd_seq_sanity_real_time(&cur_time);
	459	}
2cdc7b63	460	spin_unlock_irqrestore(&tmr->lock, flags);
1da177e4 LT	461	return cur_time;
	462	}
	463
	464	/* TODO: use interpolation on tick queue (will only be useful for very
	465	high PPQ values) */
c7e0b5bf	466	snd_seq_tick_time_t snd_seq_timer_get_cur_tick(struct snd_seq_timer *tmr)
1da177e4 LT	467	{
	468	return tmr->tick.cur_tick;
	469	}
	470
	471
cd6a6503	472	#ifdef CONFIG_SND_PROC_FS
1da177e4	473	/* exported to seq_info.c */
c7e0b5bf TI	474	void snd_seq_info_timer_read(struct snd_info_entry *entry,
c7e0b5bf TI	475	struct snd_info_buffer *buffer)
1da177e4 LT	476	{
1da177e4 LT	477	int idx;
c7e0b5bf TI	478	struct snd_seq_queue *q;
	479	struct snd_seq_timer *tmr;
	480	struct snd_timer_instance *ti;
1da177e4 LT	481	unsigned long resolution;
	482
	483	for (idx = 0; idx < SNDRV_SEQ_MAX_QUEUES; idx++) {
	484	q = queueptr(idx);
	485	if (q == NULL)
	486	continue;
	487	if ((tmr = q->timer) == NULL \|\|
	488	(ti = tmr->timeri) == NULL) {
	489	queuefree(q);
	490	continue;
	491	}
	492	snd_iprintf(buffer, "Timer for queue %i : %s\n", q->queue, ti->timer->name);
	493	resolution = snd_timer_resolution(ti) * tmr->ticks;
	494	snd_iprintf(buffer, " Period time : %lu.%09lu\n", resolution / 1000000000, resolution % 1000000000);
	495	snd_iprintf(buffer, " Skew : %u / %u\n", tmr->skew, tmr->skew_base);
	496	queuefree(q);
	497	}
	498	}
cd6a6503	499	#endif /* CONFIG_SND_PROC_FS */
04f141a8	500