linux-stable/sound/core/seq/seq_timer.c
Takashi Iwai 24db8bbaa3 ALSA: seq: Drop superfluous error/debug messages after malloc failures
The kernel memory allocators already report the errors when the
requested allocation fails, thus we don't need to warn it again in
each caller side.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2015-03-10 15:41:18 +01:00

453 lines
11 KiB
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_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 */