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![Uwe Zeisberger](/assets/img/avatar_default.png)
Many files include the filename at the beginning, serveral used a wrong one. Signed-off-by: Uwe Zeisberger <Uwe_Zeisberger@digi.com> Signed-off-by: Adrian Bunk <bunk@stusta.de>
288 lines
5.3 KiB
C
288 lines
5.3 KiB
C
/*
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* sound/oss/sys_timer.c
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*
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* The default timer for the Level 2 sequencer interface
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* Uses the (1/HZ sec) timer of kernel.
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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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* Andrew Veliath : adapted tmr2ticks from level 1 sequencer (avoid overflow)
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*/
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#include <linux/spinlock.h>
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#include "sound_config.h"
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static volatile int 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 void poll_def_tmr(unsigned long dummy);
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static DEFINE_SPINLOCK(lock);
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static DEFINE_TIMER(def_tmr, poll_def_tmr, 0, 0);
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static unsigned long
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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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/* tmr_value (ticks per sec) *
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1000000 (usecs per sec) / HZ (ticks per sec) -=> usecs */
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tmp = tmr_value * (1000000 / HZ);
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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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static void
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poll_def_tmr(unsigned long dummy)
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{
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if (opened)
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{
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{
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def_tmr.expires = (1) + jiffies;
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add_timer(&def_tmr);
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};
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if (tmr_running)
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{
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spin_lock(&lock);
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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(&lock);
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}
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}
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}
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static void
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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
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def_tmr_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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;
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{
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def_tmr.expires = (1) + jiffies;
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add_timer(&def_tmr);
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};
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return 0;
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}
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static void
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def_tmr_close(int dev)
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{
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opened = tmr_running = 0;
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del_timer(&def_tmr);
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}
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static int
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def_tmr_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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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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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 > 360)
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parm = 360;
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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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}
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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
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def_tmr_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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/* same as sound_timer.c:timer_ioctl!? */
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static int def_tmr_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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case SNDCTL_TMR_SOURCE:
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return __put_user(TMR_INTERNAL, p);
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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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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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return __put_user(curr_timebase, p);
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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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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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return __put_user(curr_tempo, p);
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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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return __put_user(val, p);
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case SNDCTL_SEQ_GETTIME:
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return __put_user(curr_ticks, p);
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case SNDCTL_TMR_METRONOME:
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/* NOP */
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break;
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default:;
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}
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return -EINVAL;
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}
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static void
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def_tmr_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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struct sound_timer_operations default_sound_timer =
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{
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.owner = THIS_MODULE,
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.info = {"System clock", 0},
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.priority = 0, /* Priority */
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.devlink = 0, /* Local device link */
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.open = def_tmr_open,
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.close = def_tmr_close,
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.event = def_tmr_event,
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.get_time = def_tmr_get_time,
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.ioctl = def_tmr_ioctl,
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.arm_timer = def_tmr_arm
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};
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