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 } 96