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16cafbd977
Contrary to its name, reg_lock locks the emu data structure, not the
registers. As the functions access only data which is set once at card
initialization, there is no point in locking it.
Actually locking the registers would be pointless as well, as
snd_emu10k1_intr_{en,dis}able() does its own locking, and TIMER is
accessed only in this one place.
Locking snd_emu10k1_timer_{start,stop}() against each other also
wouldn't buy us anything; the functions interleaving their I/O accesses
wouldn't introduce new problems.
Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Link: https://lore.kernel.org/r/20230428095941.1706278-2-oswald.buddenhagen@gmx.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) by Lee Revell <rlrevell@joe-job.com>
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* Clemens Ladisch <clemens@ladisch.de>
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* Routines for control of EMU10K1 chips
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*
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* BUGS:
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* --
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*
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* TODO:
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* --
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*/
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#include <linux/time.h>
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#include <sound/core.h>
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#include <sound/emu10k1.h>
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static int snd_emu10k1_timer_start(struct snd_timer *timer)
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{
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struct snd_emu10k1 *emu;
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unsigned int delay;
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emu = snd_timer_chip(timer);
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delay = timer->sticks - 1;
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if (delay < 5 ) /* minimum time is 5 ticks */
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delay = 5;
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snd_emu10k1_intr_enable(emu, INTE_INTERVALTIMERENB);
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outw(delay & TIMER_RATE_MASK, emu->port + TIMER);
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return 0;
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}
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static int snd_emu10k1_timer_stop(struct snd_timer *timer)
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{
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struct snd_emu10k1 *emu;
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emu = snd_timer_chip(timer);
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snd_emu10k1_intr_disable(emu, INTE_INTERVALTIMERENB);
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return 0;
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}
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static int snd_emu10k1_timer_precise_resolution(struct snd_timer *timer,
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unsigned long *num, unsigned long *den)
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{
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*num = 1;
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*den = 48000;
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return 0;
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}
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static const struct snd_timer_hardware snd_emu10k1_timer_hw = {
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.flags = SNDRV_TIMER_HW_AUTO,
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.resolution = 20833, /* 1 sample @ 48KHZ = 20.833...us */
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.ticks = 1024,
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.start = snd_emu10k1_timer_start,
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.stop = snd_emu10k1_timer_stop,
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.precise_resolution = snd_emu10k1_timer_precise_resolution,
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};
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int snd_emu10k1_timer(struct snd_emu10k1 *emu, int device)
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{
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struct snd_timer *timer = NULL;
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struct snd_timer_id tid;
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int err;
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tid.dev_class = SNDRV_TIMER_CLASS_CARD;
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tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
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tid.card = emu->card->number;
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tid.device = device;
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tid.subdevice = 0;
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err = snd_timer_new(emu->card, "EMU10K1", &tid, &timer);
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if (err >= 0) {
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strcpy(timer->name, "EMU10K1 timer");
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timer->private_data = emu;
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timer->hw = snd_emu10k1_timer_hw;
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}
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emu->timer = timer;
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return err;
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}
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