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
  28 MODULE_AUTHOR("Jochen Voss <voss@seehuhn.de>");
  29 MODULE_DESCRIPTION("PT2258 volume controller (Princeton Technology Corp.)");
  30 MODULE_LICENSE("GPL");
  31
  32 #define PT2258_CMD_RESET 0xc0
  33 #define PT2258_CMD_UNMUTE 0xf8
  34 #define PT2258_CMD_MUTE 0xf9
  35
  36 static const unsigned char pt2258_channel_code[12] = {
  37         0x80, 0x90,             /* channel 1: -10dB, -1dB */
  38         0x40, 0x50,             /* channel 2: -10dB, -1dB */
  39         0x00, 0x10,             /* channel 3: -10dB, -1dB */
  40         0x20, 0x30,             /* channel 4: -10dB, -1dB */
  41         0x60, 0x70,             /* channel 5: -10dB, -1dB */
  42         0xa0, 0xb0              /* channel 6: -10dB, -1dB */
  43 };
  44
  45 int snd_pt2258_reset(struct snd_pt2258 *pt)
  46 {
  47         unsigned char bytes[2];
  48         int i;
  49
  50         /* reset chip */
  51         bytes[0] = PT2258_CMD_RESET;
  52         snd_i2c_lock(pt->i2c_bus);
  53         if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1)
  54                 goto __error;
  55         snd_i2c_unlock(pt->i2c_bus);
  56
  57         /* mute all channels */
  58         pt->mute = 1;
  59         bytes[0] = PT2258_CMD_MUTE;
  60         snd_i2c_lock(pt->i2c_bus);
  61         if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1)
  62                 goto __error;
  63         snd_i2c_unlock(pt->i2c_bus);
  64
  65         /* set all channels to 0dB */
  66         for (i = 0; i < 6; ++i)
  67                 pt->volume[i] = 0;
  68         bytes[0] = 0xd0;
  69         bytes[1] = 0xe0;
  70         snd_i2c_lock(pt->i2c_bus);
  71         if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2)
  72                 goto __error;
  73         snd_i2c_unlock(pt->i2c_bus);
  74
  75         return 0;
  76
  77       __error:
  78         snd_i2c_unlock(pt->i2c_bus);
  79         snd_printk(KERN_ERR "PT2258 reset failed\n");
  80         return -EIO;
  81 }
  82
  83 static int pt2258_stereo_volume_info(struct snd_kcontrol *kcontrol,
  84                                      struct snd_ctl_elem_info *uinfo)
  85 {
  86         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
  87         uinfo->count = 2;
  88         uinfo->value.integer.min = 0;
  89         uinfo->value.integer.max = 79;
  90         return 0;
  91 }
  92
  93 static int pt2258_stereo_volume_get(struct snd_kcontrol *kcontrol,
  94                                     struct snd_ctl_elem_value *ucontrol)
  95 {
  96         struct snd_pt2258 *pt = kcontrol->private_data;
  97         int base = kcontrol->private_value;
  98
  99         /* chip does not support register reads */
 100         ucontrol->value.integer.value[0] = 79 - pt->volume[base];
 101         ucontrol->value.integer.value[1] = 79 - pt->volume[base + 1];
 102         return 0;
 103 }
 104
 105 static int pt2258_stereo_volume_put(struct snd_kcontrol *kcontrol,
 106                                     struct snd_ctl_elem_value *ucontrol)
 107 {
 108         struct snd_pt2258 *pt = kcontrol->private_data;
 109         int base = kcontrol->private_value;
 110         unsigned char bytes[2];
 111         int val0, val1;
 112
 113         val0 = 79 - ucontrol->value.integer.value[0];
 114         val1 = 79 - ucontrol->value.integer.value[1];
 115         if (val0 < 0 || val0 > 79 || val1 < 0 || val1 > 79)
 116                 return -EINVAL;
 117         if (val0 == pt->volume[base] && val1 == pt->volume[base + 1])
 118                 return 0;
 119
 120         pt->volume[base] = val0;
 121         bytes[0] = pt2258_channel_code[2 * base] | (val0 / 10);
 122         bytes[1] = pt2258_channel_code[2 * base + 1] | (val0 % 10);
 123         snd_i2c_lock(pt->i2c_bus);
 124         if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2)
 125                 goto __error;
 126         snd_i2c_unlock(pt->i2c_bus);
 127
 128         pt->volume[base + 1] = val1;
 129         bytes[0] = pt2258_channel_code[2 * base + 2] | (val1 / 10);
 130         bytes[1] = pt2258_channel_code[2 * base + 3] | (val1 % 10);
 131         snd_i2c_lock(pt->i2c_bus);
 132         if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2)
 133                 goto __error;
 134         snd_i2c_unlock(pt->i2c_bus);
 135
 136         return 1;
 137
 138       __error:
 139         snd_i2c_unlock(pt->i2c_bus);
 140         snd_printk(KERN_ERR "PT2258 access failed\n");
 141         return -EIO;
 142 }
 143
 144 #define pt2258_switch_info      snd_ctl_boolean_mono_info
 145
 146 static int pt2258_switch_get(struct snd_kcontrol *kcontrol,
 147                              struct snd_ctl_elem_value *ucontrol)
 148 {
 149         struct snd_pt2258 *pt = kcontrol->private_data;
 150
 151         ucontrol->value.integer.value[0] = !pt->mute;
 152         return 0;
 153 }
 154
 155 static int pt2258_switch_put(struct snd_kcontrol *kcontrol,
 156                              struct snd_ctl_elem_value *ucontrol)
 157 {
 158         struct snd_pt2258 *pt = kcontrol->private_data;
 159         unsigned char bytes[2];
 160         int val;
 161
 162         val = !ucontrol->value.integer.value[0];
 163         if (pt->mute == val)
 164                 return 0;
 165
 166         pt->mute = val;
 167         bytes[0] = val ? PT2258_CMD_MUTE : PT2258_CMD_UNMUTE;
 168         snd_i2c_lock(pt->i2c_bus);
 169         if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1)
 170                 goto __error;
 171         snd_i2c_unlock(pt->i2c_bus);
 172
 173         return 1;
 174
 175       __error:
 176         snd_i2c_unlock(pt->i2c_bus);
 177         snd_printk(KERN_ERR "PT2258 access failed 2\n");
 178         return -EIO;
 179 }
 180
 181 static const DECLARE_TLV_DB_SCALE(pt2258_db_scale, -7900, 100, 0);
 182
 183 int snd_pt2258_build_controls(struct snd_pt2258 *pt)
 184 {
 185         struct snd_kcontrol_new knew;
 186         char *names[3] = {
 187                 "Mic Loopback Playback Volume",
 188                 "Line Loopback Playback Volume",
 189                 "CD Loopback Playback Volume"
 190         };
 191         int i, err;
 192
 193         for (i = 0; i < 3; ++i) {
 194                 memset(&knew, 0, sizeof(knew));
 195                 knew.name = names[i];
 196                 knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
 197                 knew.count = 1;
 198                 knew.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
 199                     SNDRV_CTL_ELEM_ACCESS_TLV_READ;
 200                 knew.private_value = 2 * i;
 201                 knew.info = pt2258_stereo_volume_info;
 202                 knew.get = pt2258_stereo_volume_get;
 203                 knew.put = pt2258_stereo_volume_put;
 204                 knew.tlv.p = pt2258_db_scale;
 205
 206                 err = snd_ctl_add(pt->card, snd_ctl_new1(&knew, pt));
 207                 if (err < 0)
 208                         return err;
 209         }
 210
 211         memset(&knew, 0, sizeof(knew));
 212         knew.name = "Loopback Switch";
 213         knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
 214         knew.info = pt2258_switch_info;
 215         knew.get = pt2258_switch_get;
 216         knew.put = pt2258_switch_put;
 217         knew.access = 0;
 218         err = snd_ctl_add(pt->card, snd_ctl_new1(&knew, pt));
 219         if (err < 0)
 220                 return err;
 221
 222         return 0;
 223 }
 224
 225 EXPORT_SYMBOL(snd_pt2258_reset);
 226 EXPORT_SYMBOL(snd_pt2258_build_controls);