sound/i2c/other/pt2258.c

   1 /*
   2  *   ALSA Driver for the PT2258 volume controller.
   3  *
   4  *      Copyright (c) 2006  Jochen Voss <voss@seehuhn.de>
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <sound/core.h>
  23 #include <sound/control.h>
  24 #include <sound/tlv.h>
  25 #include <sound/i2c.h>
  26 #include <sound/pt2258.h>
  27 #include <linux/module.h>
  28
  29 MODULE_AUTHOR("Jochen Voss <voss@seehuhn.de>");
  30 MODULE_DESCRIPTION("PT2258 volume controller (Princeton Technology Corp.)");
  31 MODULE_LICENSE("GPL");
  32
  33 #define PT2258_CMD_RESET 0xc0
  34 #define PT2258_CMD_UNMUTE 0xf8
  35 #define PT2258_CMD_MUTE 0xf9
  36
  37 static const unsigned char pt2258_channel_code[12] = {
  38         0x80, 0x90,             /* channel 1: -10dB, -1dB */
  39         0x40, 0x50,             /* channel 2: -10dB, -1dB */
  40         0x00, 0x10,             /* channel 3: -10dB, -1dB */
  41         0x20, 0x30,             /* channel 4: -10dB, -1dB */
  42         0x60, 0x70,             /* channel 5: -10dB, -1dB */
  43         0xa0, 0xb0              /* channel 6: -10dB, -1dB */
  44 };
  45
  46 int snd_pt2258_reset(struct snd_pt2258 *pt)
  47 {
  48         unsigned char bytes[2];
  49         int i;
  50
  51         /* reset chip */
  52         bytes[0] = PT2258_CMD_RESET;
  53         snd_i2c_lock(pt->i2c_bus);
  54         if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1)
  55                 goto __error;
  56         snd_i2c_unlock(pt->i2c_bus);
  57
  58         /* mute all channels */
  59         pt->mute = 1;
  60         bytes[0] = PT2258_CMD_MUTE;
  61         snd_i2c_lock(pt->i2c_bus);
  62         if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1)
  63                 goto __error;
  64         snd_i2c_unlock(pt->i2c_bus);
  65
  66         /* set all channels to 0dB */
  67         for (i = 0; i < 6; ++i)
  68                 pt->volume[i] = 0;
  69         bytes[0] = 0xd0;
  70         bytes[1] = 0xe0;
  71         snd_i2c_lock(pt->i2c_bus);
  72         if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2)
  73                 goto __error;
  74         snd_i2c_unlock(pt->i2c_bus);
  75
  76         return 0;
  77
  78       __error:
  79         snd_i2c_unlock(pt->i2c_bus);
  80         snd_printk(KERN_ERR "PT2258 reset failed\n");
  81         return -EIO;
  82 }
  83
  84 static int pt2258_stereo_volume_info(struct snd_kcontrol *kcontrol,
  85                                      struct snd_ctl_elem_info *uinfo)
  86 {
  87         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
  88         uinfo->count = 2;
  89         uinfo->value.integer.min = 0;
  90         uinfo->value.integer.max = 79;
  91         return 0;
  92 }
  93
  94 static int pt2258_stereo_volume_get(struct snd_kcontrol *kcontrol,
  95                                     struct snd_ctl_elem_value *ucontrol)
  96 {
  97         struct snd_pt2258 *pt = kcontrol->private_data;
  98         int base = kcontrol->private_value;
  99
 100         /* chip does not support register reads */
 101         ucontrol->value.integer.value[0] = 79 - pt->volume[base];
 102         ucontrol->value.integer.value[1] = 79 - pt->volume[base + 1];
 103         return 0;
 104 }
 105
 106 static int pt2258_stereo_volume_put(struct snd_kcontrol *kcontrol,
 107                                     struct snd_ctl_elem_value *ucontrol)
 108 {
 109         struct snd_pt2258 *pt = kcontrol->private_data;
 110         int base = kcontrol->private_value;
 111         unsigned char bytes[2];
 112         int val0, val1;
 113
 114         val0 = 79 - ucontrol->value.integer.value[0];
 115         val1 = 79 - ucontrol->value.integer.value[1];
 116         if (val0 < 0 || val0 > 79 || val1 < 0 || val1 > 79)
 117                 return -EINVAL;
 118         if (val0 == pt->volume[base] && val1 == pt->volume[base + 1])
 119                 return 0;
 120
 121         pt->volume[base] = val0;
 122         bytes[0] = pt2258_channel_code[2 * base] | (val0 / 10);
 123         bytes[1] = pt2258_channel_code[2 * base + 1] | (val0 % 10);
 124         snd_i2c_lock(pt->i2c_bus);
 125         if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2)
 126                 goto __error;
 127         snd_i2c_unlock(pt->i2c_bus);
 128
 129         pt->volume[base + 1] = val1;
 130         bytes[0] = pt2258_channel_code[2 * base + 2] | (val1 / 10);
 131         bytes[1] = pt2258_channel_code[2 * base + 3] | (val1 % 10);
 132         snd_i2c_lock(pt->i2c_bus);
 133         if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2)
 134                 goto __error;
 135         snd_i2c_unlock(pt->i2c_bus);
 136
 137         return 1;
 138
 139       __error:
 140         snd_i2c_unlock(pt->i2c_bus);
 141         snd_printk(KERN_ERR "PT2258 access failed\n");
 142         return -EIO;
 143 }
 144
 145 #define pt2258_switch_info      snd_ctl_boolean_mono_info
 146
 147 static int pt2258_switch_get(struct snd_kcontrol *kcontrol,
 148                              struct snd_ctl_elem_value *ucontrol)
 149 {
 150         struct snd_pt2258 *pt = kcontrol->private_data;
 151
 152         ucontrol->value.integer.value[0] = !pt->mute;
 153         return 0;
 154 }
 155
 156 static int pt2258_switch_put(struct snd_kcontrol *kcontrol,
 157                              struct snd_ctl_elem_value *ucontrol)
 158 {
 159         struct snd_pt2258 *pt = kcontrol->private_data;
 160         unsigned char bytes[2];
 161         int val;
 162
 163         val = !ucontrol->value.integer.value[0];
 164         if (pt->mute == val)
 165                 return 0;
 166
 167         pt->mute = val;
 168         bytes[0] = val ? PT2258_CMD_MUTE : PT2258_CMD_UNMUTE;
 169         snd_i2c_lock(pt->i2c_bus);
 170         if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1)
 171                 goto __error;
 172         snd_i2c_unlock(pt->i2c_bus);
 173
 174         return 1;
 175
 176       __error:
 177         snd_i2c_unlock(pt->i2c_bus);
 178         snd_printk(KERN_ERR "PT2258 access failed 2\n");
 179         return -EIO;
 180 }
 181
 182 static const DECLARE_TLV_DB_SCALE(pt2258_db_scale, -7900, 100, 0);
 183
 184 int snd_pt2258_build_controls(struct snd_pt2258 *pt)
 185 {
 186         struct snd_kcontrol_new knew;
 187         char *names[3] = {
 188                 "Mic Loopback Playback Volume",
 189                 "Line Loopback Playback Volume",
 190                 "CD Loopback Playback Volume"
 191         };
 192         int i, err;
 193
 194         for (i = 0; i < 3; ++i) {
 195                 memset(&knew, 0, sizeof(knew));
 196                 knew.name = names[i];
 197                 knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
 198                 knew.count = 1;
 199                 knew.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
 200                     SNDRV_CTL_ELEM_ACCESS_TLV_READ;
 201                 knew.private_value = 2 * i;
 202                 knew.info = pt2258_stereo_volume_info;
 203                 knew.get = pt2258_stereo_volume_get;
 204                 knew.put = pt2258_stereo_volume_put;
 205                 knew.tlv.p = pt2258_db_scale;
 206
 207                 err = snd_ctl_add(pt->card, snd_ctl_new1(&knew, pt));
 208                 if (err < 0)
 209                         return err;
 210         }
 211
 212         memset(&knew, 0, sizeof(knew));
 213         knew.name = "Loopback Switch";
 214         knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
 215         knew.info = pt2258_switch_info;
 216         knew.get = pt2258_switch_get;
 217         knew.put = pt2258_switch_put;
 218         knew.access = 0;
 219         err = snd_ctl_add(pt->card, snd_ctl_new1(&knew, pt));
 220         if (err < 0)
 221                 return err;
 222
 223         return 0;
 224 }
 225
 226 EXPORT_SYMBOL(snd_pt2258_reset);
 227 EXPORT_SYMBOL(snd_pt2258_build_controls);