mirror of https://gitee.com/openkylin/linux.git
83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* OPL4 mixer functions
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* Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
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*/
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#include "opl4_local.h"
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#include <sound/control.h>
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static int snd_opl4_ctl_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
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{
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uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
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uinfo->count = 2;
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uinfo->value.integer.min = 0;
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uinfo->value.integer.max = 7;
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return 0;
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}
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static int snd_opl4_ctl_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_opl4 *opl4 = snd_kcontrol_chip(kcontrol);
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unsigned long flags;
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u8 reg = kcontrol->private_value;
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u8 value;
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spin_lock_irqsave(&opl4->reg_lock, flags);
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value = snd_opl4_read(opl4, reg);
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spin_unlock_irqrestore(&opl4->reg_lock, flags);
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ucontrol->value.integer.value[0] = 7 - (value & 7);
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ucontrol->value.integer.value[1] = 7 - ((value >> 3) & 7);
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return 0;
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}
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static int snd_opl4_ctl_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_opl4 *opl4 = snd_kcontrol_chip(kcontrol);
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unsigned long flags;
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u8 reg = kcontrol->private_value;
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u8 value, old_value;
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value = (7 - (ucontrol->value.integer.value[0] & 7)) |
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((7 - (ucontrol->value.integer.value[1] & 7)) << 3);
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spin_lock_irqsave(&opl4->reg_lock, flags);
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old_value = snd_opl4_read(opl4, reg);
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snd_opl4_write(opl4, reg, value);
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spin_unlock_irqrestore(&opl4->reg_lock, flags);
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return value != old_value;
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}
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static const struct snd_kcontrol_new snd_opl4_controls[] = {
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{
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.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
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.name = "FM Playback Volume",
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.info = snd_opl4_ctl_info,
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.get = snd_opl4_ctl_get,
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.put = snd_opl4_ctl_put,
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.private_value = OPL4_REG_MIX_CONTROL_FM
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},
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{
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.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
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.name = "Wavetable Playback Volume",
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.info = snd_opl4_ctl_info,
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.get = snd_opl4_ctl_get,
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.put = snd_opl4_ctl_put,
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.private_value = OPL4_REG_MIX_CONTROL_PCM
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}
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};
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int snd_opl4_create_mixer(struct snd_opl4 *opl4)
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{
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struct snd_card *card = opl4->card;
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int i, err;
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strcat(card->mixername, ",OPL4");
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for (i = 0; i < 2; ++i) {
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err = snd_ctl_add(card, snd_ctl_new1(&snd_opl4_controls[i], opl4));
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if (err < 0)
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return err;
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}
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return 0;
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}
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