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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * OPL4 mixer functions4 * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>5 */6 7#include "opl4_local.h"8#include <sound/control.h>9 10static int snd_opl4_ctl_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)11{12 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;13 uinfo->count = 2;14 uinfo->value.integer.min = 0;15 uinfo->value.integer.max = 7;16 return 0;17}18 19static int snd_opl4_ctl_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)20{21 struct snd_opl4 *opl4 = snd_kcontrol_chip(kcontrol);22 unsigned long flags;23 u8 reg = kcontrol->private_value;24 u8 value;25 26 spin_lock_irqsave(&opl4->reg_lock, flags);27 value = snd_opl4_read(opl4, reg);28 spin_unlock_irqrestore(&opl4->reg_lock, flags);29 ucontrol->value.integer.value[0] = 7 - (value & 7);30 ucontrol->value.integer.value[1] = 7 - ((value >> 3) & 7);31 return 0;32}33 34static int snd_opl4_ctl_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)35{36 struct snd_opl4 *opl4 = snd_kcontrol_chip(kcontrol);37 unsigned long flags;38 u8 reg = kcontrol->private_value;39 u8 value, old_value;40 41 value = (7 - (ucontrol->value.integer.value[0] & 7)) |42 ((7 - (ucontrol->value.integer.value[1] & 7)) << 3);43 spin_lock_irqsave(&opl4->reg_lock, flags);44 old_value = snd_opl4_read(opl4, reg);45 snd_opl4_write(opl4, reg, value);46 spin_unlock_irqrestore(&opl4->reg_lock, flags);47 return value != old_value;48}49 50static const struct snd_kcontrol_new snd_opl4_controls[] = {51 {52 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,53 .name = "FM Playback Volume",54 .info = snd_opl4_ctl_info,55 .get = snd_opl4_ctl_get,56 .put = snd_opl4_ctl_put,57 .private_value = OPL4_REG_MIX_CONTROL_FM58 },59 {60 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,61 .name = "Wavetable Playback Volume",62 .info = snd_opl4_ctl_info,63 .get = snd_opl4_ctl_get,64 .put = snd_opl4_ctl_put,65 .private_value = OPL4_REG_MIX_CONTROL_PCM66 }67};68 69int snd_opl4_create_mixer(struct snd_opl4 *opl4)70{71 struct snd_card *card = opl4->card;72 int i, err;73 74 strcat(card->mixername, ",OPL4");75 76 for (i = 0; i < 2; ++i) {77 err = snd_ctl_add(card, snd_ctl_new1(&snd_opl4_controls[i], opl4));78 if (err < 0)79 return err;80 }81 return 0;82}83