83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
/*
|
||
|
* Copyright (c) by Lee Revell <rlrevell@joe-job.com>
|
||
|
* Clemens Ladisch <clemens@ladisch.de>
|
||
|
* Routines for control of EMU10K1 chips
|
||
|
*
|
||
|
* BUGS:
|
||
|
* --
|
||
|
*
|
||
|
* TODO:
|
||
|
* --
|
||
|
*/
|
||
|
|
||
|
#include <linux/time.h>
|
||
|
#include <sound/core.h>
|
||
|
#include <sound/emu10k1.h>
|
||
|
|
||
|
static int snd_emu10k1_timer_start(struct snd_timer *timer)
|
||
|
{
|
||
|
struct snd_emu10k1 *emu;
|
||
|
unsigned long flags;
|
||
|
unsigned int delay;
|
||
|
|
||
|
emu = snd_timer_chip(timer);
|
||
|
delay = timer->sticks - 1;
|
||
|
if (delay < 5 ) /* minimum time is 5 ticks */
|
||
|
delay = 5;
|
||
|
spin_lock_irqsave(&emu->reg_lock, flags);
|
||
|
snd_emu10k1_intr_enable(emu, INTE_INTERVALTIMERENB);
|
||
|
outw(delay & TIMER_RATE_MASK, emu->port + TIMER);
|
||
|
spin_unlock_irqrestore(&emu->reg_lock, flags);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int snd_emu10k1_timer_stop(struct snd_timer *timer)
|
||
|
{
|
||
|
struct snd_emu10k1 *emu;
|
||
|
unsigned long flags;
|
||
|
|
||
|
emu = snd_timer_chip(timer);
|
||
|
spin_lock_irqsave(&emu->reg_lock, flags);
|
||
|
snd_emu10k1_intr_disable(emu, INTE_INTERVALTIMERENB);
|
||
|
spin_unlock_irqrestore(&emu->reg_lock, flags);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int snd_emu10k1_timer_precise_resolution(struct snd_timer *timer,
|
||
|
unsigned long *num, unsigned long *den)
|
||
|
{
|
||
|
*num = 1;
|
||
|
*den = 48000;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static struct snd_timer_hardware snd_emu10k1_timer_hw = {
|
||
|
.flags = SNDRV_TIMER_HW_AUTO,
|
||
|
.resolution = 20833, /* 1 sample @ 48KHZ = 20.833...us */
|
||
|
.ticks = 1024,
|
||
|
.start = snd_emu10k1_timer_start,
|
||
|
.stop = snd_emu10k1_timer_stop,
|
||
|
.precise_resolution = snd_emu10k1_timer_precise_resolution,
|
||
|
};
|
||
|
|
||
|
int snd_emu10k1_timer(struct snd_emu10k1 *emu, int device)
|
||
|
{
|
||
|
struct snd_timer *timer = NULL;
|
||
|
struct snd_timer_id tid;
|
||
|
int err;
|
||
|
|
||
|
tid.dev_class = SNDRV_TIMER_CLASS_CARD;
|
||
|
tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
|
||
|
tid.card = emu->card->number;
|
||
|
tid.device = device;
|
||
|
tid.subdevice = 0;
|
||
|
if ((err = snd_timer_new(emu->card, "EMU10K1", &tid, &timer)) >= 0) {
|
||
|
strcpy(timer->name, "EMU10K1 timer");
|
||
|
timer->private_data = emu;
|
||
|
timer->hw = snd_emu10k1_timer_hw;
|
||
|
}
|
||
|
emu->timer = timer;
|
||
|
return err;
|
||
|
}
|