Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
opl4_mixer.c
Go to the documentation of this file.
1 /*
2  * OPL4 mixer functions
3  * Copyright (c) 2003 by Clemens Ladisch <[email protected]>
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 {
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  {
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  {
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 
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 }