| /* |
| * ALSA sequencer Timer |
| * Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl> |
| * Jaroslav Kysela <perex@suse.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/driver.h> |
| #include <sound/core.h> |
| #include <linux/slab.h> |
| #include "seq_timer.h" |
| #include "seq_queue.h" |
| #include "seq_info.h" |
| |
| extern int seq_default_timer_class; |
| extern int seq_default_timer_sclass; |
| extern int seq_default_timer_card; |
| extern int seq_default_timer_device; |
| extern int seq_default_timer_subdevice; |
| extern int seq_default_timer_resolution; |
| |
| #define SKEW_BASE 0x10000 /* 16bit shift */ |
| |
| static void snd_seq_timer_set_tick_resolution(seq_timer_tick_t *tick, |
| int tempo, int ppq, int nticks) |
| { |
| if (tempo < 1000000) |
| tick->resolution = (tempo * 1000) / ppq; |
| else { |
| /* might overflow.. */ |
| unsigned int s; |
| s = tempo % ppq; |
| s = (s * 1000) / ppq; |
| tick->resolution = (tempo / ppq) * 1000; |
| tick->resolution += s; |
| } |
| if (tick->resolution <= 0) |
| tick->resolution = 1; |
| tick->resolution *= nticks; |
| snd_seq_timer_update_tick(tick, 0); |
| } |
| |
| /* create new timer (constructor) */ |
| seq_timer_t *snd_seq_timer_new(void) |
| { |
| seq_timer_t *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(seq_timer_t **tmr) |
| { |
| seq_timer_t *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(seq_timer_t * tmr) |
| { |
| /* setup defaults */ |
| tmr->ppq = 96; /* 96 PPQ */ |
| tmr->tempo = 500000; /* 120 BPM */ |
| snd_seq_timer_set_tick_resolution(&tmr->tick, tmr->tempo, tmr->ppq, 1); |
| 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(seq_timer_t * 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(snd_timer_instance_t *timeri, |
| unsigned long resolution, |
| unsigned long ticks) |
| { |
| unsigned long flags; |
| queue_t *q = (queue_t *)timeri->callback_data; |
| seq_timer_t *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(seq_timer_t * tmr, int tempo) |
| { |
| unsigned long flags; |
| |
| snd_assert(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->tick, tmr->tempo, tmr->ppq, 1); |
| } |
| spin_unlock_irqrestore(&tmr->lock, flags); |
| return 0; |
| } |
| |
| /* set current ppq */ |
| int snd_seq_timer_set_ppq(seq_timer_t * tmr, int ppq) |
| { |
| unsigned long flags; |
| |
| snd_assert(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->tick, tmr->tempo, tmr->ppq, 1); |
| spin_unlock_irqrestore(&tmr->lock, flags); |
| return 0; |
| } |
| |
| /* set current tick position */ |
| int snd_seq_timer_set_position_tick(seq_timer_t *tmr, snd_seq_tick_time_t position) |
| { |
| unsigned long flags; |
| |
| snd_assert(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(seq_timer_t *tmr, snd_seq_real_time_t position) |
| { |
| unsigned long flags; |
| |
| snd_assert(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(seq_timer_t *tmr, unsigned int skew, unsigned int base) |
| { |
| unsigned long flags; |
| |
| snd_assert(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(queue_t *q) |
| { |
| snd_timer_instance_t *t; |
| seq_timer_t *tmr; |
| char str[32]; |
| int err; |
| |
| tmr = q->timer; |
| snd_assert(tmr != NULL, 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) { |
| snd_timer_id_t 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(queue_t *q) |
| { |
| seq_timer_t *tmr; |
| |
| tmr = q->timer; |
| snd_assert(tmr != NULL, 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(seq_timer_t * 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(seq_timer_t *tmr) |
| { |
| snd_timer_t *t; |
| t = tmr->timeri->timer; |
| snd_assert(t, return -EINVAL); |
| |
| tmr->ticks = 1; |
| if (tmr->preferred_resolution && |
| ! (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 * tmr->preferred_resolution)); |
| if (! tmr->ticks) |
| tmr->ticks = 1; |
| } |
| } |
| tmr->initialized = 1; |
| return 0; |
| } |
| |
| int snd_seq_timer_start(seq_timer_t * 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(seq_timer_t * 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(seq_timer_t *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(seq_timer_t *tmr) |
| { |
| return tmr->tick.cur_tick; |
| } |
| |
| |
| /* exported to seq_info.c */ |
| void snd_seq_info_timer_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) |
| { |
| int idx; |
| queue_t *q; |
| seq_timer_t *tmr; |
| snd_timer_instance_t *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); |
| } |
| } |