release/src-rt-6.x.4708/linux/linux-2.6.36/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 }