diff options
Diffstat (limited to 'sound/core/seq/oss/seq_oss_timer.c')
| -rw-r--r-- | sound/core/seq/oss/seq_oss_timer.c | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/sound/core/seq/oss/seq_oss_timer.c b/sound/core/seq/oss/seq_oss_timer.c new file mode 100644 index 000000000000..42ca9493fa60 --- /dev/null +++ b/sound/core/seq/oss/seq_oss_timer.c @@ -0,0 +1,283 @@ +/* + * OSS compatible sequencer driver + * + * Timer control routines + * + * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de> + * + * 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 "seq_oss_timer.h" +#include "seq_oss_event.h" +#include <sound/seq_oss_legacy.h> + +/* + */ +#define MIN_OSS_TEMPO 8 +#define MAX_OSS_TEMPO 360 +#define MIN_OSS_TIMEBASE 1 +#define MAX_OSS_TIMEBASE 1000 + +/* + */ +static void calc_alsa_tempo(seq_oss_timer_t *timer); +static int send_timer_event(seq_oss_devinfo_t *dp, int type, int value); + + +/* + * create and register a new timer. + * if queue is not started yet, start it. + */ +seq_oss_timer_t * +snd_seq_oss_timer_new(seq_oss_devinfo_t *dp) +{ + seq_oss_timer_t *rec; + + rec = kcalloc(1, sizeof(*rec), GFP_KERNEL); + if (rec == NULL) + return NULL; + + rec->dp = dp; + rec->cur_tick = 0; + rec->realtime = 0; + rec->running = 0; + rec->oss_tempo = 60; + rec->oss_timebase = 100; + calc_alsa_tempo(rec); + + return rec; +} + + +/* + * delete timer. + * if no more timer exists, stop the queue. + */ +void +snd_seq_oss_timer_delete(seq_oss_timer_t *rec) +{ + if (rec) { + snd_seq_oss_timer_stop(rec); + kfree(rec); + } +} + + +/* + * process one timing event + * return 1 : event proceseed -- skip this event + * 0 : not a timer event -- enqueue this event + */ +int +snd_seq_oss_process_timer_event(seq_oss_timer_t *rec, evrec_t *ev) +{ + abstime_t parm = ev->t.time; + + if (ev->t.code == EV_TIMING) { + switch (ev->t.cmd) { + case TMR_WAIT_REL: + parm += rec->cur_tick; + rec->realtime = 0; + /* continue to next */ + case TMR_WAIT_ABS: + if (parm == 0) { + rec->realtime = 1; + } else if (parm >= rec->cur_tick) { + rec->realtime = 0; + rec->cur_tick = parm; + } + return 1; /* skip this event */ + + case TMR_START: + snd_seq_oss_timer_start(rec); + return 1; + + } + } else if (ev->s.code == SEQ_WAIT) { + /* time = from 1 to 3 bytes */ + parm = (ev->echo >> 8) & 0xffffff; + if (parm > rec->cur_tick) { + /* set next event time */ + rec->cur_tick = parm; + rec->realtime = 0; + } + return 1; + } + + return 0; +} + + +/* + * convert tempo units + */ +static void +calc_alsa_tempo(seq_oss_timer_t *timer) +{ + timer->tempo = (60 * 1000000) / timer->oss_tempo; + timer->ppq = timer->oss_timebase; +} + + +/* + * dispatch a timer event + */ +static int +send_timer_event(seq_oss_devinfo_t *dp, int type, int value) +{ + snd_seq_event_t ev; + + memset(&ev, 0, sizeof(ev)); + ev.type = type; + ev.source.client = dp->cseq; + ev.source.port = 0; + ev.dest.client = SNDRV_SEQ_CLIENT_SYSTEM; + ev.dest.port = SNDRV_SEQ_PORT_SYSTEM_TIMER; + ev.queue = dp->queue; + ev.data.queue.queue = dp->queue; + ev.data.queue.param.value = value; + return snd_seq_kernel_client_dispatch(dp->cseq, &ev, 1, 0); +} + +/* + * set queue tempo and start queue + */ +int +snd_seq_oss_timer_start(seq_oss_timer_t *timer) +{ + seq_oss_devinfo_t *dp = timer->dp; + snd_seq_queue_tempo_t tmprec; + + if (timer->running) + snd_seq_oss_timer_stop(timer); + + memset(&tmprec, 0, sizeof(tmprec)); + tmprec.queue = dp->queue; + tmprec.ppq = timer->ppq; + tmprec.tempo = timer->tempo; + snd_seq_set_queue_tempo(dp->cseq, &tmprec); + + send_timer_event(dp, SNDRV_SEQ_EVENT_START, 0); + timer->running = 1; + timer->cur_tick = 0; + return 0; +} + + +/* + * stop queue + */ +int +snd_seq_oss_timer_stop(seq_oss_timer_t *timer) +{ + if (! timer->running) + return 0; + send_timer_event(timer->dp, SNDRV_SEQ_EVENT_STOP, 0); + timer->running = 0; + return 0; +} + + +/* + * continue queue + */ +int +snd_seq_oss_timer_continue(seq_oss_timer_t *timer) +{ + if (timer->running) + return 0; + send_timer_event(timer->dp, SNDRV_SEQ_EVENT_CONTINUE, 0); + timer->running = 1; + return 0; +} + + +/* + * change queue tempo + */ +int +snd_seq_oss_timer_tempo(seq_oss_timer_t *timer, int value) +{ + if (value < MIN_OSS_TEMPO) + value = MIN_OSS_TEMPO; + else if (value > MAX_OSS_TEMPO) + value = MAX_OSS_TEMPO; + timer->oss_tempo = value; + calc_alsa_tempo(timer); + if (timer->running) + send_timer_event(timer->dp, SNDRV_SEQ_EVENT_TEMPO, timer->tempo); + return 0; +} + + +/* + * ioctls + */ +int +snd_seq_oss_timer_ioctl(seq_oss_timer_t *timer, unsigned int cmd, int __user *arg) +{ + int value; + + if (cmd == SNDCTL_SEQ_CTRLRATE) { + debug_printk(("ctrl rate\n")); + /* if *arg == 0, just return the current rate */ + if (get_user(value, arg)) + return -EFAULT; + if (value) + return -EINVAL; + value = ((timer->oss_tempo * timer->oss_timebase) + 30) / 60; + return put_user(value, arg) ? -EFAULT : 0; + } + + if (timer->dp->seq_mode == SNDRV_SEQ_OSS_MODE_SYNTH) + return 0; + + switch (cmd) { + case SNDCTL_TMR_START: + debug_printk(("timer start\n")); + return snd_seq_oss_timer_start(timer); + case SNDCTL_TMR_STOP: + debug_printk(("timer stop\n")); + return snd_seq_oss_timer_stop(timer); + case SNDCTL_TMR_CONTINUE: + debug_printk(("timer continue\n")); + return snd_seq_oss_timer_continue(timer); + case SNDCTL_TMR_TEMPO: + debug_printk(("timer tempo\n")); + if (get_user(value, arg)) + return -EFAULT; + return snd_seq_oss_timer_tempo(timer, value); + case SNDCTL_TMR_TIMEBASE: + debug_printk(("timer timebase\n")); + if (get_user(value, arg)) + return -EFAULT; + if (value < MIN_OSS_TIMEBASE) + value = MIN_OSS_TIMEBASE; + else if (value > MAX_OSS_TIMEBASE) + value = MAX_OSS_TIMEBASE; + timer->oss_timebase = value; + calc_alsa_tempo(timer); + return 0; + + case SNDCTL_TMR_METRONOME: + case SNDCTL_TMR_SELECT: + case SNDCTL_TMR_SOURCE: + debug_printk(("timer XXX\n")); + /* not supported */ + return 0; + } + return 0; +} |