[ALSA] bt87x - fix detection of unknown card
[linux-2.6] / sound / drivers / opl4 / opl4_mixer.c
1 /*
2  * OPL4 mixer functions
3  * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
18  */
19
20 #include "opl4_local.h"
21 #include <sound/control.h>
22
23 static int snd_opl4_ctl_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
24 {
25         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
26         uinfo->count = 2;
27         uinfo->value.integer.min = 0;
28         uinfo->value.integer.max = 7;
29         return 0;
30 }
31
32 static int snd_opl4_ctl_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
33 {
34         struct snd_opl4 *opl4 = snd_kcontrol_chip(kcontrol);
35         unsigned long flags;
36         u8 reg = kcontrol->private_value;
37         u8 value;
38
39         spin_lock_irqsave(&opl4->reg_lock, flags);
40         value = snd_opl4_read(opl4, reg);
41         spin_unlock_irqrestore(&opl4->reg_lock, flags);
42         ucontrol->value.integer.value[0] = 7 - (value & 7);
43         ucontrol->value.integer.value[1] = 7 - ((value >> 3) & 7);
44         return 0;
45 }
46
47 static int snd_opl4_ctl_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
48 {
49         struct snd_opl4 *opl4 = snd_kcontrol_chip(kcontrol);
50         unsigned long flags;
51         u8 reg = kcontrol->private_value;
52         u8 value, old_value;
53
54         value = (7 - (ucontrol->value.integer.value[0] & 7)) |
55                 ((7 - (ucontrol->value.integer.value[1] & 7)) << 3);
56         spin_lock_irqsave(&opl4->reg_lock, flags);
57         old_value = snd_opl4_read(opl4, reg);
58         snd_opl4_write(opl4, reg, value);
59         spin_unlock_irqrestore(&opl4->reg_lock, flags);
60         return value != old_value;
61 }
62
63 static struct snd_kcontrol_new snd_opl4_controls[] = {
64         {
65                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
66                 .name = "FM Playback Volume",
67                 .info = snd_opl4_ctl_info,
68                 .get = snd_opl4_ctl_get,
69                 .put = snd_opl4_ctl_put,
70                 .private_value = OPL4_REG_MIX_CONTROL_FM
71         },
72         {
73                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
74                 .name = "Wavetable Playback Volume",
75                 .info = snd_opl4_ctl_info,
76                 .get = snd_opl4_ctl_get,
77                 .put = snd_opl4_ctl_put,
78                 .private_value = OPL4_REG_MIX_CONTROL_PCM
79         }
80 };
81
82 int snd_opl4_create_mixer(struct snd_opl4 *opl4)
83 {
84         struct snd_card *card = opl4->card;
85         int i, err;
86
87         strcat(card->mixername, ",OPL4");
88
89         for (i = 0; i < 2; ++i) {
90                 err = snd_ctl_add(card, snd_ctl_new1(&snd_opl4_controls[i], opl4));
91                 if (err < 0)
92                         return err;
93         }
94         return 0;
95 }