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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) by Lee Revell <rlrevell@joe-job.com>
* Clemens Ladisch <clemens@ladisch.de>
* Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
*
* Routines for control of EMU10K1 chips
*/
#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 int delay;
emu = snd_timer_chip(timer);
delay = timer->sticks - 1;
if (delay < 5 ) /* minimum time is 5 ticks */
delay = 5;
snd_emu10k1_intr_enable(emu, INTE_INTERVALTIMERENB);
outw(delay & TIMER_RATE_MASK, emu->port + TIMER);
return 0;
}
static int snd_emu10k1_timer_stop(struct snd_timer *timer)
{
struct snd_emu10k1 *emu;
emu = snd_timer_chip(timer);
snd_emu10k1_intr_disable(emu, INTE_INTERVALTIMERENB);
return 0;
}
static unsigned long snd_emu10k1_timer_c_resolution(struct snd_timer *timer)
{
struct snd_emu10k1 *emu = snd_timer_chip(timer);
if (emu->card_capabilities->emu_model &&
emu->emu1010.word_clock == 44100)
return 22676; // 1 sample @ 44.1 kHz = 22.675736...us
else
return 20833; // 1 sample @ 48 kHz = 20.833...us
}
static int snd_emu10k1_timer_precise_resolution(struct snd_timer *timer,
unsigned long *num, unsigned long *den)
{
struct snd_emu10k1 *emu = snd_timer_chip(timer);
*num = 1;
if (emu->card_capabilities->emu_model)
*den = emu->emu1010.word_clock;
else
*den = 48000;
return 0;
}
static const struct snd_timer_hardware snd_emu10k1_timer_hw = {
.flags = SNDRV_TIMER_HW_AUTO,
.ticks = 1024,
.start = snd_emu10k1_timer_start,
.stop = snd_emu10k1_timer_stop,
.c_resolution = snd_emu10k1_timer_c_resolution,
.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;
err = snd_timer_new(emu->card, "EMU10K1", &tid, &timer);
if (err >= 0) {
strcpy(timer->name, "EMU10K1 timer");
timer->private_data = emu;
timer->hw = snd_emu10k1_timer_hw;
}
emu->timer = timer;
return err;
}
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