opl4_mixer.c

 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
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	u8 reg = kcontrol->private_value;
23	u8 value;
24
25	guard(spinlock_irqsave)(&opl4->reg_lock);
26	value = snd_opl4_read(opl4, reg);
27	ucontrol->value.integer.value[0] = 7 - (value & 7);
28	ucontrol->value.integer.value[1] = 7 - ((value >> 3) & 7);
29	return 0;
30}
31
32static int snd_opl4_ctl_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
33{
34	struct snd_opl4 *opl4 = snd_kcontrol_chip(kcontrol);
35	u8 reg = kcontrol->private_value;
36	u8 value, old_value;
37
38	value = (7 - (ucontrol->value.integer.value[0] & 7)) |
39		((7 - (ucontrol->value.integer.value[1] & 7)) << 3);
40	guard(spinlock_irqsave)(&opl4->reg_lock);
41	old_value = snd_opl4_read(opl4, reg);
42	snd_opl4_write(opl4, reg, value);
43	return value != old_value;
44}
45
46static const struct snd_kcontrol_new snd_opl4_controls[] = {
47	{
48		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
49		.name = "FM Playback Volume",
50		.info = snd_opl4_ctl_info,
51		.get = snd_opl4_ctl_get,
52		.put = snd_opl4_ctl_put,
53		.private_value = OPL4_REG_MIX_CONTROL_FM
54	},
55	{
56		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
57		.name = "Wavetable Playback Volume",
58		.info = snd_opl4_ctl_info,
59		.get = snd_opl4_ctl_get,
60		.put = snd_opl4_ctl_put,
61		.private_value = OPL4_REG_MIX_CONTROL_PCM
62	}
63};
64
65int snd_opl4_create_mixer(struct snd_opl4 *opl4)
66{
67	struct snd_card *card = opl4->card;
68	int i, err;
69
70	strcat(card->mixername, ",OPL4");
71
72	for (i = 0; i < 2; ++i) {
73		err = snd_ctl_add(card, snd_ctl_new1(&snd_opl4_controls[i], opl4));
74		if (err < 0)
75			return err;
76	}
77	return 0;
78}