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); 228