328 lines
6.1 KiB
C
328 lines
6.1 KiB
C
/*
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* sound/oss/sound_timer.c
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*/
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/*
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* Copyright (C) by Hannu Savolainen 1993-1997
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*
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* OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
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* Version 2 (June 1991). See the "COPYING" file distributed with this software
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* for more info.
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*/
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/*
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* Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
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*/
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#include <linux/string.h>
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#include <linux/spinlock.h>
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#include "sound_config.h"
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static volatile int initialized, opened, tmr_running;
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static volatile time_t tmr_offs, tmr_ctr;
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static volatile unsigned long ticks_offs;
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static volatile int curr_tempo, curr_timebase;
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static volatile unsigned long curr_ticks;
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static volatile unsigned long next_event_time;
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static unsigned long prev_event_time;
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static volatile unsigned long usecs_per_tmr; /* Length of the current interval */
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static struct sound_lowlev_timer *tmr;
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static DEFINE_SPINLOCK(lock);
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static unsigned long tmr2ticks(int tmr_value)
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{
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/*
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* Convert timer ticks to MIDI ticks
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*/
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unsigned long tmp;
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unsigned long scale;
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tmp = tmr_value * usecs_per_tmr; /* Convert to usecs */
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scale = (60 * 1000000) / (curr_tempo * curr_timebase); /* usecs per MIDI tick */
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return (tmp + (scale / 2)) / scale;
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}
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void reprogram_timer(void)
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{
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unsigned long usecs_per_tick;
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/*
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* The user is changing the timer rate before setting a timer
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* slap, bad bad not allowed.
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*/
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if(!tmr)
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return;
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usecs_per_tick = (60 * 1000000) / (curr_tempo * curr_timebase);
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/*
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* Don't kill the system by setting too high timer rate
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*/
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if (usecs_per_tick < 2000)
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usecs_per_tick = 2000;
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usecs_per_tmr = tmr->tmr_start(tmr->dev, usecs_per_tick);
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}
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void sound_timer_syncinterval(unsigned int new_usecs)
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{
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/*
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* This routine is called by the hardware level if
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* the clock frequency has changed for some reason.
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*/
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tmr_offs = tmr_ctr;
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ticks_offs += tmr2ticks(tmr_ctr);
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tmr_ctr = 0;
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usecs_per_tmr = new_usecs;
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}
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EXPORT_SYMBOL(sound_timer_syncinterval);
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static void tmr_reset(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&lock,flags);
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tmr_offs = 0;
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ticks_offs = 0;
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tmr_ctr = 0;
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next_event_time = (unsigned long) -1;
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prev_event_time = 0;
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curr_ticks = 0;
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spin_unlock_irqrestore(&lock,flags);
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}
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static int timer_open(int dev, int mode)
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{
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if (opened)
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return -EBUSY;
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tmr_reset();
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curr_tempo = 60;
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curr_timebase = 100;
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opened = 1;
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reprogram_timer();
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return 0;
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}
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static void timer_close(int dev)
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{
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opened = tmr_running = 0;
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tmr->tmr_disable(tmr->dev);
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}
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static int timer_event(int dev, unsigned char *event)
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{
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unsigned char cmd = event[1];
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unsigned long parm = *(int *) &event[4];
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switch (cmd)
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{
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case TMR_WAIT_REL:
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parm += prev_event_time;
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case TMR_WAIT_ABS:
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if (parm > 0)
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{
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long time;
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if (parm <= curr_ticks) /* It's the time */
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return TIMER_NOT_ARMED;
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time = parm;
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next_event_time = prev_event_time = time;
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return TIMER_ARMED;
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}
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break;
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case TMR_START:
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tmr_reset();
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tmr_running = 1;
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reprogram_timer();
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break;
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case TMR_STOP:
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tmr_running = 0;
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break;
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case TMR_CONTINUE:
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tmr_running = 1;
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reprogram_timer();
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break;
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case TMR_TEMPO:
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if (parm)
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{
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if (parm < 8)
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parm = 8;
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if (parm > 250)
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parm = 250;
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tmr_offs = tmr_ctr;
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ticks_offs += tmr2ticks(tmr_ctr);
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tmr_ctr = 0;
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curr_tempo = parm;
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reprogram_timer();
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}
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break;
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case TMR_ECHO:
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seq_copy_to_input(event, 8);
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break;
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default:;
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}
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return TIMER_NOT_ARMED;
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}
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static unsigned long timer_get_time(int dev)
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{
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if (!opened)
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return 0;
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return curr_ticks;
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}
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static int timer_ioctl(int dev, unsigned int cmd, void __user *arg)
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{
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int __user *p = arg;
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int val;
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switch (cmd)
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{
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case SNDCTL_TMR_SOURCE:
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val = TMR_INTERNAL;
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break;
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case SNDCTL_TMR_START:
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tmr_reset();
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tmr_running = 1;
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return 0;
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case SNDCTL_TMR_STOP:
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tmr_running = 0;
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return 0;
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case SNDCTL_TMR_CONTINUE:
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tmr_running = 1;
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return 0;
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case SNDCTL_TMR_TIMEBASE:
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if (get_user(val, p))
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return -EFAULT;
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if (val)
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{
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if (val < 1)
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val = 1;
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if (val > 1000)
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val = 1000;
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curr_timebase = val;
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}
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val = curr_timebase;
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break;
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case SNDCTL_TMR_TEMPO:
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if (get_user(val, p))
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return -EFAULT;
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if (val)
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{
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if (val < 8)
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val = 8;
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if (val > 250)
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val = 250;
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tmr_offs = tmr_ctr;
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ticks_offs += tmr2ticks(tmr_ctr);
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tmr_ctr = 0;
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curr_tempo = val;
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reprogram_timer();
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}
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val = curr_tempo;
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break;
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case SNDCTL_SEQ_CTRLRATE:
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if (get_user(val, p))
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return -EFAULT;
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if (val != 0) /* Can't change */
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return -EINVAL;
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val = ((curr_tempo * curr_timebase) + 30) / 60;
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break;
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case SNDCTL_SEQ_GETTIME:
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val = curr_ticks;
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break;
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case SNDCTL_TMR_METRONOME:
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default:
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return -EINVAL;
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}
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return put_user(val, p);
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}
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static void timer_arm(int dev, long time)
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{
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if (time < 0)
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time = curr_ticks + 1;
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else if (time <= curr_ticks) /* It's the time */
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return;
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next_event_time = prev_event_time = time;
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return;
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}
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static struct sound_timer_operations sound_timer =
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{
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.owner = THIS_MODULE,
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.info = {"Sound Timer", 0},
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.priority = 1, /* Priority */
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.devlink = 0, /* Local device link */
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.open = timer_open,
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.close = timer_close,
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.event = timer_event,
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.get_time = timer_get_time,
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.ioctl = timer_ioctl,
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.arm_timer = timer_arm
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};
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void sound_timer_interrupt(void)
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{
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unsigned long flags;
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if (!opened)
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return;
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tmr->tmr_restart(tmr->dev);
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if (!tmr_running)
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return;
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spin_lock_irqsave(&lock,flags);
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tmr_ctr++;
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curr_ticks = ticks_offs + tmr2ticks(tmr_ctr);
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if (curr_ticks >= next_event_time)
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{
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next_event_time = (unsigned long) -1;
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sequencer_timer(0);
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}
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spin_unlock_irqrestore(&lock,flags);
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}
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EXPORT_SYMBOL(sound_timer_interrupt);
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void sound_timer_init(struct sound_lowlev_timer *t, char *name)
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{
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int n;
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if (initialized)
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{
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if (t->priority <= tmr->priority)
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return; /* There is already a similar or better timer */
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tmr = t;
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return;
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}
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initialized = 1;
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tmr = t;
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n = sound_alloc_timerdev();
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if (n == -1)
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n = 0; /* Overwrite the system timer */
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strlcpy(sound_timer.info.name, name, sizeof(sound_timer.info.name));
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sound_timer_devs[n] = &sound_timer;
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}
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EXPORT_SYMBOL(sound_timer_init);
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