1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * OPL4 mixer functions
4 * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
5 */
6
7 #include "opl4_local.h"
8 #include <sound/control.h>
9
10 static 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
19 static 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
34 static 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
50 static 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_FM
58 },
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_PCM
66 }
67 };
68
69 int 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
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