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/driver.h> 23 #include <sound/core.h> 24 #include <sound/control.h> 25 #include <sound/tlv.h> 26 #include <sound/i2c.h> 27 #include <sound/pt2258.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 == pt->volume[base] && val1 == pt->volume[base + 1]) 117 return 0; 118 119 pt->volume[base] = val0; 120 bytes[0] = pt2258_channel_code[2 * base] | (val0 / 10); 121 bytes[1] = pt2258_channel_code[2 * base + 1] | (val0 % 10); 122 snd_i2c_lock(pt->i2c_bus); 123 if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2) 124 goto __error; 125 snd_i2c_unlock(pt->i2c_bus); 126 127 pt->volume[base + 1] = val1; 128 bytes[0] = pt2258_channel_code[2 * base + 2] | (val1 / 10); 129 bytes[1] = pt2258_channel_code[2 * base + 3] | (val1 % 10); 130 snd_i2c_lock(pt->i2c_bus); 131 if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2) 132 goto __error; 133 snd_i2c_unlock(pt->i2c_bus); 134 135 return 1; 136 137 __error: 138 snd_i2c_unlock(pt->i2c_bus); 139 snd_printk(KERN_ERR "PT2258 access failed\n"); 140 return -EIO; 141 } 142 143 #define pt2258_switch_info snd_ctl_boolean_mono_info 144 145 static int pt2258_switch_get(struct snd_kcontrol *kcontrol, 146 struct snd_ctl_elem_value *ucontrol) 147 { 148 struct snd_pt2258 *pt = kcontrol->private_data; 149 150 ucontrol->value.integer.value[0] = !pt->mute; 151 return 0; 152 } 153 154 static int pt2258_switch_put(struct snd_kcontrol *kcontrol, 155 struct snd_ctl_elem_value *ucontrol) 156 { 157 struct snd_pt2258 *pt = kcontrol->private_data; 158 unsigned char bytes[2]; 159 int val; 160 161 val = !ucontrol->value.integer.value[0]; 162 if (pt->mute == val) 163 return 0; 164 165 pt->mute = val; 166 bytes[0] = val ? PT2258_CMD_MUTE : PT2258_CMD_UNMUTE; 167 snd_i2c_lock(pt->i2c_bus); 168 if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1) 169 goto __error; 170 snd_i2c_unlock(pt->i2c_bus); 171 172 return 1; 173 174 __error: 175 snd_i2c_unlock(pt->i2c_bus); 176 snd_printk(KERN_ERR "PT2258 access failed 2\n"); 177 return -EIO; 178 } 179 180 static const DECLARE_TLV_DB_SCALE(pt2258_db_scale, -7900, 100, 0); 181 182 int snd_pt2258_build_controls(struct snd_pt2258 *pt) 183 { 184 struct snd_kcontrol_new knew; 185 char *names[3] = { 186 "Mic Loopback Playback Volume", 187 "Line Loopback Playback Volume", 188 "CD Loopback Playback Volume" 189 }; 190 int i, err; 191 192 for (i = 0; i < 3; ++i) { 193 memset(&knew, 0, sizeof(knew)); 194 knew.name = names[i]; 195 knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER; 196 knew.count = 1; 197 knew.access = SNDRV_CTL_ELEM_ACCESS_READWRITE | 198 SNDRV_CTL_ELEM_ACCESS_TLV_READ; 199 knew.private_value = 2 * i; 200 knew.info = pt2258_stereo_volume_info; 201 knew.get = pt2258_stereo_volume_get; 202 knew.put = pt2258_stereo_volume_put; 203 knew.tlv.p = pt2258_db_scale; 204 205 err = snd_ctl_add(pt->card, snd_ctl_new1(&knew, pt)); 206 if (err < 0) 207 return err; 208 } 209 210 memset(&knew, 0, sizeof(knew)); 211 knew.name = "Loopback Switch"; 212 knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER; 213 knew.info = pt2258_switch_info; 214 knew.get = pt2258_switch_get; 215 knew.put = pt2258_switch_put; 216 knew.access = 0; 217 err = snd_ctl_add(pt->card, snd_ctl_new1(&knew, pt)); 218 if (err < 0) 219 return err; 220 221 return 0; 222 } 223 224 EXPORT_SYMBOL(snd_pt2258_reset); 225 EXPORT_SYMBOL(snd_pt2258_build_controls); 226