sound/usb/6fire/control.c

   1 /*
   2  * Linux driver for TerraTec DMX 6Fire USB
   3  *
   4  * Mixer control
   5  *
   6  * Author:      Torsten Schenk <torsten.schenk@zoho.com>
   7  * Created:     Jan 01, 2011
   8  * Copyright:   (C) Torsten Schenk
   9  *
  10  * Thanks to:
  11  * - Holger Ruckdeschel: he found out how to control individual channel
  12  *   volumes and introduced mute switch
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  */
  19
  20 #include <linux/interrupt.h>
  21 #include <sound/control.h>
  22 #include <sound/tlv.h>
  23
  24 #include "control.h"
  25 #include "comm.h"
  26 #include "chip.h"
  27
  28 static char *opt_coax_texts[2] = { "Optical", "Coax" };
  29 static char *line_phono_texts[2] = { "Line", "Phono" };
  30
  31 /*
  32  * data that needs to be sent to device. sets up card internal stuff.
  33  * values dumped from windows driver and filtered by trial'n'error.
  34  */
  35 static const struct {
  36         u8 type;
  37         u8 reg;
  38         u8 value;
  39 }
  40 init_data[] = {
  41         { 0x22, 0x00, 0x00 }, { 0x20, 0x00, 0x08 }, { 0x22, 0x01, 0x01 },
  42         { 0x20, 0x01, 0x08 }, { 0x22, 0x02, 0x00 }, { 0x20, 0x02, 0x08 },
  43         { 0x22, 0x03, 0x00 }, { 0x20, 0x03, 0x08 }, { 0x22, 0x04, 0x00 },
  44         { 0x20, 0x04, 0x08 }, { 0x22, 0x05, 0x01 }, { 0x20, 0x05, 0x08 },
  45         { 0x22, 0x04, 0x01 }, { 0x12, 0x04, 0x00 }, { 0x12, 0x05, 0x00 },
  46         { 0x12, 0x0d, 0x38 }, { 0x12, 0x21, 0x82 }, { 0x12, 0x22, 0x80 },
  47         { 0x12, 0x23, 0x00 }, { 0x12, 0x06, 0x02 }, { 0x12, 0x03, 0x00 },
  48         { 0x12, 0x02, 0x00 }, { 0x22, 0x03, 0x01 },
  49         { 0 } /* TERMINATING ENTRY */
  50 };
  51
  52 static const int rates_altsetting[] = { 1, 1, 2, 2, 3, 3 };
  53 /* values to write to soundcard register for all samplerates */
  54 static const u16 rates_6fire_vl[] = {0x00, 0x01, 0x00, 0x01, 0x00, 0x01};
  55 static const u16 rates_6fire_vh[] = {0x11, 0x11, 0x10, 0x10, 0x00, 0x00};
  56
  57 static DECLARE_TLV_DB_MINMAX(tlv_output, -9000, 0);
  58 static DECLARE_TLV_DB_MINMAX(tlv_input, -1500, 1500);
  59
  60 enum {
  61         DIGITAL_THRU_ONLY_SAMPLERATE = 3
  62 };
  63
  64 static void usb6fire_control_output_vol_update(struct control_runtime *rt)
  65 {
  66         struct comm_runtime *comm_rt = rt->chip->comm;
  67         int i;
  68
  69         if (comm_rt)
  70                 for (i = 0; i < 6; i++)
  71                         if (!(rt->ovol_updated & (1 << i))) {
  72                                 comm_rt->write8(comm_rt, 0x12, 0x0f + i,
  73                                         180 - rt->output_vol[i]);
  74                                 rt->ovol_updated |= 1 << i;
  75                         }
  76 }
  77
  78 static void usb6fire_control_output_mute_update(struct control_runtime *rt)
  79 {
  80         struct comm_runtime *comm_rt = rt->chip->comm;
  81
  82         if (comm_rt)
  83                 comm_rt->write8(comm_rt, 0x12, 0x0e, ~rt->output_mute);
  84 }
  85
  86 static void usb6fire_control_input_vol_update(struct control_runtime *rt)
  87 {
  88         struct comm_runtime *comm_rt = rt->chip->comm;
  89         int i;
  90
  91         if (comm_rt)
  92                 for (i = 0; i < 2; i++)
  93                         if (!(rt->ivol_updated & (1 << i))) {
  94                                 comm_rt->write8(comm_rt, 0x12, 0x1c + i,
  95                                         rt->input_vol[i] & 0x3f);
  96                                 rt->ivol_updated |= 1 << i;
  97                         }
  98 }
  99
 100 static void usb6fire_control_line_phono_update(struct control_runtime *rt)
 101 {
 102         struct comm_runtime *comm_rt = rt->chip->comm;
 103         if (comm_rt) {
 104                 comm_rt->write8(comm_rt, 0x22, 0x02, rt->line_phono_switch);
 105                 comm_rt->write8(comm_rt, 0x21, 0x02, rt->line_phono_switch);
 106         }
 107 }
 108
 109 static void usb6fire_control_opt_coax_update(struct control_runtime *rt)
 110 {
 111         struct comm_runtime *comm_rt = rt->chip->comm;
 112         if (comm_rt) {
 113                 comm_rt->write8(comm_rt, 0x22, 0x00, rt->opt_coax_switch);
 114                 comm_rt->write8(comm_rt, 0x21, 0x00, rt->opt_coax_switch);
 115         }
 116 }
 117
 118 static int usb6fire_control_set_rate(struct control_runtime *rt, int rate)
 119 {
 120         int ret;
 121         struct usb_device *device = rt->chip->dev;
 122         struct comm_runtime *comm_rt = rt->chip->comm;
 123
 124         if (rate < 0 || rate >= CONTROL_N_RATES)
 125                 return -EINVAL;
 126
 127         ret = usb_set_interface(device, 1, rates_altsetting[rate]);
 128         if (ret < 0)
 129                 return ret;
 130
 131         /* set soundcard clock */
 132         ret = comm_rt->write16(comm_rt, 0x02, 0x01, rates_6fire_vl[rate],
 133                         rates_6fire_vh[rate]);
 134         if (ret < 0)
 135                 return ret;
 136
 137         return 0;
 138 }
 139
 140 static int usb6fire_control_set_channels(
 141         struct control_runtime *rt, int n_analog_out,
 142         int n_analog_in, bool spdif_out, bool spdif_in)
 143 {
 144         int ret;
 145         struct comm_runtime *comm_rt = rt->chip->comm;
 146
 147         /* enable analog inputs and outputs
 148          * (one bit per stereo-channel) */
 149         ret = comm_rt->write16(comm_rt, 0x02, 0x02,
 150                         (1 << (n_analog_out / 2)) - 1,
 151                         (1 << (n_analog_in / 2)) - 1);
 152         if (ret < 0)
 153                 return ret;
 154
 155         /* disable digital inputs and outputs */
 156         /* TODO: use spdif_x to enable/disable digital channels */
 157         ret = comm_rt->write16(comm_rt, 0x02, 0x03, 0x00, 0x00);
 158         if (ret < 0)
 159                 return ret;
 160
 161         return 0;
 162 }
 163
 164 static int usb6fire_control_streaming_update(struct control_runtime *rt)
 165 {
 166         struct comm_runtime *comm_rt = rt->chip->comm;
 167
 168         if (comm_rt) {
 169                 if (!rt->usb_streaming && rt->digital_thru_switch)
 170                         usb6fire_control_set_rate(rt,
 171                                 DIGITAL_THRU_ONLY_SAMPLERATE);
 172                 return comm_rt->write16(comm_rt, 0x02, 0x00, 0x00,
 173                         (rt->usb_streaming ? 0x01 : 0x00) |
 174                         (rt->digital_thru_switch ? 0x08 : 0x00));
 175         }
 176         return -EINVAL;
 177 }
 178
 179 static int usb6fire_control_output_vol_info(struct snd_kcontrol *kcontrol,
 180                 struct snd_ctl_elem_info *uinfo)
 181 {
 182         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 183         uinfo->count = 2;
 184         uinfo->value.integer.min = 0;
 185         uinfo->value.integer.max = 180;
 186         return 0;
 187 }
 188
 189 static int usb6fire_control_output_vol_put(struct snd_kcontrol *kcontrol,
 190                 struct snd_ctl_elem_value *ucontrol)
 191 {
 192         struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 193         unsigned int ch = kcontrol->private_value;
 194         int changed = 0;
 195
 196         if (ch > 4) {
 197                 snd_printk(KERN_ERR PREFIX "Invalid channel in volume control.");
 198                 return -EINVAL;
 199         }
 200
 201         if (rt->output_vol[ch] != ucontrol->value.integer.value[0]) {
 202                 rt->output_vol[ch] = ucontrol->value.integer.value[0];
 203                 rt->ovol_updated &= ~(1 << ch);
 204                 changed = 1;
 205         }
 206         if (rt->output_vol[ch + 1] != ucontrol->value.integer.value[1]) {
 207                 rt->output_vol[ch + 1] = ucontrol->value.integer.value[1];
 208                 rt->ovol_updated &= ~(2 << ch);
 209                 changed = 1;
 210         }
 211
 212         if (changed)
 213                 usb6fire_control_output_vol_update(rt);
 214
 215         return changed;
 216 }
 217
 218 static int usb6fire_control_output_vol_get(struct snd_kcontrol *kcontrol,
 219                 struct snd_ctl_elem_value *ucontrol)
 220 {
 221         struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 222         unsigned int ch = kcontrol->private_value;
 223
 224         if (ch > 4) {
 225                 snd_printk(KERN_ERR PREFIX "Invalid channel in volume control.");
 226                 return -EINVAL;
 227         }
 228
 229         ucontrol->value.integer.value[0] = rt->output_vol[ch];
 230         ucontrol->value.integer.value[1] = rt->output_vol[ch + 1];
 231         return 0;
 232 }
 233
 234 static int usb6fire_control_output_mute_put(struct snd_kcontrol *kcontrol,
 235         struct snd_ctl_elem_value *ucontrol)
 236 {
 237         struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 238         unsigned int ch = kcontrol->private_value;
 239         u8 old = rt->output_mute;
 240         u8 value = 0;
 241
 242         if (ch > 4) {
 243                 snd_printk(KERN_ERR PREFIX "Invalid channel in volume control.");
 244                 return -EINVAL;
 245         }
 246
 247         rt->output_mute &= ~(3 << ch);
 248         if (ucontrol->value.integer.value[0])
 249                 value |= 1;
 250         if (ucontrol->value.integer.value[1])
 251                 value |= 2;
 252         rt->output_mute |= value << ch;
 253
 254         if (rt->output_mute != old)
 255                 usb6fire_control_output_mute_update(rt);
 256
 257         return rt->output_mute != old;
 258 }
 259
 260 static int usb6fire_control_output_mute_get(struct snd_kcontrol *kcontrol,
 261         struct snd_ctl_elem_value *ucontrol)
 262 {
 263         struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 264         unsigned int ch = kcontrol->private_value;
 265         u8 value = rt->output_mute >> ch;
 266
 267         if (ch > 4) {
 268                 snd_printk(KERN_ERR PREFIX "Invalid channel in volume control.");
 269                 return -EINVAL;
 270         }
 271
 272         ucontrol->value.integer.value[0] = 1 & value;
 273         value >>= 1;
 274         ucontrol->value.integer.value[1] = 1 & value;
 275
 276         return 0;
 277 }
 278
 279 static int usb6fire_control_input_vol_info(struct snd_kcontrol *kcontrol,
 280                 struct snd_ctl_elem_info *uinfo)
 281 {
 282         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 283         uinfo->count = 2;
 284         uinfo->value.integer.min = 0;
 285         uinfo->value.integer.max = 30;
 286         return 0;
 287 }
 288
 289 static int usb6fire_control_input_vol_put(struct snd_kcontrol *kcontrol,
 290                 struct snd_ctl_elem_value *ucontrol)
 291 {
 292         struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 293         int changed = 0;
 294
 295         if (rt->input_vol[0] != ucontrol->value.integer.value[0]) {
 296                 rt->input_vol[0] = ucontrol->value.integer.value[0] - 15;
 297                 rt->ivol_updated &= ~(1 << 0);
 298                 changed = 1;
 299         }
 300         if (rt->input_vol[1] != ucontrol->value.integer.value[1]) {
 301                 rt->input_vol[1] = ucontrol->value.integer.value[1] - 15;
 302                 rt->ivol_updated &= ~(1 << 1);
 303                 changed = 1;
 304         }
 305
 306         if (changed)
 307                 usb6fire_control_input_vol_update(rt);
 308
 309         return changed;
 310 }
 311
 312 static int usb6fire_control_input_vol_get(struct snd_kcontrol *kcontrol,
 313                 struct snd_ctl_elem_value *ucontrol)
 314 {
 315         struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 316
 317         ucontrol->value.integer.value[0] = rt->input_vol[0] + 15;
 318         ucontrol->value.integer.value[1] = rt->input_vol[1] + 15;
 319
 320         return 0;
 321 }
 322
 323 static int usb6fire_control_line_phono_info(struct snd_kcontrol *kcontrol,
 324                 struct snd_ctl_elem_info *uinfo)
 325 {
 326         uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
 327         uinfo->count = 1;
 328         uinfo->value.enumerated.items = 2;
 329         if (uinfo->value.enumerated.item > 1)
 330                 uinfo->value.enumerated.item = 1;
 331         strcpy(uinfo->value.enumerated.name,
 332                         line_phono_texts[uinfo->value.enumerated.item]);
 333         return 0;
 334 }
 335
 336 static int usb6fire_control_line_phono_put(struct snd_kcontrol *kcontrol,
 337                 struct snd_ctl_elem_value *ucontrol)
 338 {
 339         struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 340         int changed = 0;
 341         if (rt->line_phono_switch != ucontrol->value.integer.value[0]) {
 342                 rt->line_phono_switch = ucontrol->value.integer.value[0];
 343                 usb6fire_control_line_phono_update(rt);
 344                 changed = 1;
 345         }
 346         return changed;
 347 }
 348
 349 static int usb6fire_control_line_phono_get(struct snd_kcontrol *kcontrol,
 350                 struct snd_ctl_elem_value *ucontrol)
 351 {
 352         struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 353         ucontrol->value.integer.value[0] = rt->line_phono_switch;
 354         return 0;
 355 }
 356
 357 static int usb6fire_control_opt_coax_info(struct snd_kcontrol *kcontrol,
 358                 struct snd_ctl_elem_info *uinfo)
 359 {
 360         uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
 361         uinfo->count = 1;
 362         uinfo->value.enumerated.items = 2;
 363         if (uinfo->value.enumerated.item > 1)
 364                 uinfo->value.enumerated.item = 1;
 365         strcpy(uinfo->value.enumerated.name,
 366                         opt_coax_texts[uinfo->value.enumerated.item]);
 367         return 0;
 368 }
 369
 370 static int usb6fire_control_opt_coax_put(struct snd_kcontrol *kcontrol,
 371                 struct snd_ctl_elem_value *ucontrol)
 372 {
 373         struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 374         int changed = 0;
 375
 376         if (rt->opt_coax_switch != ucontrol->value.enumerated.item[0]) {
 377                 rt->opt_coax_switch = ucontrol->value.enumerated.item[0];
 378                 usb6fire_control_opt_coax_update(rt);
 379                 changed = 1;
 380         }
 381         return changed;
 382 }
 383
 384 static int usb6fire_control_opt_coax_get(struct snd_kcontrol *kcontrol,
 385                 struct snd_ctl_elem_value *ucontrol)
 386 {
 387         struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 388         ucontrol->value.enumerated.item[0] = rt->opt_coax_switch;
 389         return 0;
 390 }
 391
 392 static int usb6fire_control_digital_thru_put(struct snd_kcontrol *kcontrol,
 393                 struct snd_ctl_elem_value *ucontrol)
 394 {
 395         struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 396         int changed = 0;
 397
 398         if (rt->digital_thru_switch != ucontrol->value.integer.value[0]) {
 399                 rt->digital_thru_switch = ucontrol->value.integer.value[0];
 400                 usb6fire_control_streaming_update(rt);
 401                 changed = 1;
 402         }
 403         return changed;
 404 }
 405
 406 static int usb6fire_control_digital_thru_get(struct snd_kcontrol *kcontrol,
 407                 struct snd_ctl_elem_value *ucontrol)
 408 {
 409         struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
 410         ucontrol->value.integer.value[0] = rt->digital_thru_switch;
 411         return 0;
 412 }
 413
 414 static struct snd_kcontrol_new vol_elements[] = {
 415         {
 416                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 417                 .name = "Analog Playback Volume",
 418                 .index = 0,
 419                 .private_value = 0,
 420                 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
 421                         SNDRV_CTL_ELEM_ACCESS_TLV_READ,
 422                 .info = usb6fire_control_output_vol_info,
 423                 .get = usb6fire_control_output_vol_get,
 424                 .put = usb6fire_control_output_vol_put,
 425                 .tlv = { .p = tlv_output }
 426         },
 427         {
 428                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 429                 .name = "Analog Playback Volume",
 430                 .index = 1,
 431                 .private_value = 2,
 432                 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
 433                         SNDRV_CTL_ELEM_ACCESS_TLV_READ,
 434                 .info = usb6fire_control_output_vol_info,
 435                 .get = usb6fire_control_output_vol_get,
 436                 .put = usb6fire_control_output_vol_put,
 437                 .tlv = { .p = tlv_output }
 438         },
 439         {
 440                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 441                 .name = "Analog Playback Volume",
 442                 .index = 2,
 443                 .private_value = 4,
 444                 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
 445                         SNDRV_CTL_ELEM_ACCESS_TLV_READ,
 446                 .info = usb6fire_control_output_vol_info,
 447                 .get = usb6fire_control_output_vol_get,
 448                 .put = usb6fire_control_output_vol_put,
 449                 .tlv = { .p = tlv_output }
 450         },
 451         {}
 452 };
 453
 454 static struct snd_kcontrol_new mute_elements[] = {
 455         {
 456                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 457                 .name = "Analog Playback Switch",
 458                 .index = 0,
 459                 .private_value = 0,
 460                 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 461                 .info = snd_ctl_boolean_stereo_info,
 462                 .get = usb6fire_control_output_mute_get,
 463                 .put = usb6fire_control_output_mute_put,
 464         },
 465         {
 466                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 467                 .name = "Analog Playback Switch",
 468                 .index = 1,
 469                 .private_value = 2,
 470                 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 471                 .info = snd_ctl_boolean_stereo_info,
 472                 .get = usb6fire_control_output_mute_get,
 473                 .put = usb6fire_control_output_mute_put,
 474         },
 475         {
 476                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 477                 .name = "Analog Playback Switch",
 478                 .index = 2,
 479                 .private_value = 4,
 480                 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 481                 .info = snd_ctl_boolean_stereo_info,
 482                 .get = usb6fire_control_output_mute_get,
 483                 .put = usb6fire_control_output_mute_put,
 484         },
 485         {}
 486 };
 487
 488 static struct snd_kcontrol_new elements[] = {
 489         {
 490                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 491                 .name = "Line/Phono Capture Route",
 492                 .index = 0,
 493                 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 494                 .info = usb6fire_control_line_phono_info,
 495                 .get = usb6fire_control_line_phono_get,
 496                 .put = usb6fire_control_line_phono_put
 497         },
 498         {
 499                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 500                 .name = "Opt/Coax Capture Route",
 501                 .index = 0,
 502                 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 503                 .info = usb6fire_control_opt_coax_info,
 504                 .get = usb6fire_control_opt_coax_get,
 505                 .put = usb6fire_control_opt_coax_put
 506         },
 507         {
 508                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 509                 .name = "Digital Thru Playback Route",
 510                 .index = 0,
 511                 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 512                 .info = snd_ctl_boolean_mono_info,
 513                 .get = usb6fire_control_digital_thru_get,
 514                 .put = usb6fire_control_digital_thru_put
 515         },
 516         {
 517                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 518                 .name = "Analog Capture Volume",
 519                 .index = 0,
 520                 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
 521                         SNDRV_CTL_ELEM_ACCESS_TLV_READ,
 522                 .info = usb6fire_control_input_vol_info,
 523                 .get = usb6fire_control_input_vol_get,
 524                 .put = usb6fire_control_input_vol_put,
 525                 .tlv = { .p = tlv_input }
 526         },
 527         {}
 528 };
 529
 530 static int usb6fire_control_add_virtual(
 531         struct control_runtime *rt,
 532         struct snd_card *card,
 533         char *name,
 534         struct snd_kcontrol_new *elems)
 535 {
 536         int ret;
 537         int i;
 538         struct snd_kcontrol *vmaster =
 539                 snd_ctl_make_virtual_master(name, tlv_output);
 540         struct snd_kcontrol *control;
 541
 542         if (!vmaster)
 543                 return -ENOMEM;
 544         ret = snd_ctl_add(card, vmaster);
 545         if (ret < 0)
 546                 return ret;
 547
 548         i = 0;
 549         while (elems[i].name) {
 550                 control = snd_ctl_new1(&elems[i], rt);
 551                 if (!control)
 552                         return -ENOMEM;
 553                 ret = snd_ctl_add(card, control);
 554                 if (ret < 0)
 555                         return ret;
 556                 ret = snd_ctl_add_slave(vmaster, control);
 557                 if (ret < 0)
 558                         return ret;
 559                 i++;
 560         }
 561         return 0;
 562 }
 563
 564 int usb6fire_control_init(struct sfire_chip *chip)
 565 {
 566         int i;
 567         int ret;
 568         struct control_runtime *rt = kzalloc(sizeof(struct control_runtime),
 569                         GFP_KERNEL);
 570         struct comm_runtime *comm_rt = chip->comm;
 571
 572         if (!rt)
 573                 return -ENOMEM;
 574
 575         rt->chip = chip;
 576         rt->update_streaming = usb6fire_control_streaming_update;
 577         rt->set_rate = usb6fire_control_set_rate;
 578         rt->set_channels = usb6fire_control_set_channels;
 579
 580         i = 0;
 581         while (init_data[i].type) {
 582                 comm_rt->write8(comm_rt, init_data[i].type, init_data[i].reg,
 583                                 init_data[i].value);
 584                 i++;
 585         }
 586
 587         usb6fire_control_opt_coax_update(rt);
 588         usb6fire_control_line_phono_update(rt);
 589         usb6fire_control_output_vol_update(rt);
 590         usb6fire_control_output_mute_update(rt);
 591         usb6fire_control_input_vol_update(rt);
 592         usb6fire_control_streaming_update(rt);
 593
 594         ret = usb6fire_control_add_virtual(rt, chip->card,
 595                 "Master Playback Volume", vol_elements);
 596         if (ret) {
 597                 snd_printk(KERN_ERR PREFIX "cannot add control.\n");
 598                 kfree(rt);
 599                 return ret;
 600         }
 601         ret = usb6fire_control_add_virtual(rt, chip->card,
 602                 "Master Playback Switch", mute_elements);
 603         if (ret) {
 604                 snd_printk(KERN_ERR PREFIX "cannot add control.\n");
 605                 kfree(rt);
 606                 return ret;
 607         }
 608
 609         i = 0;
 610         while (elements[i].name) {
 611                 ret = snd_ctl_add(chip->card, snd_ctl_new1(&elements[i], rt));
 612                 if (ret < 0) {
 613                         kfree(rt);
 614                         snd_printk(KERN_ERR PREFIX "cannot add control.\n");
 615                         return ret;
 616                 }
 617                 i++;
 618         }
 619
 620         chip->control = rt;
 621         return 0;
 622 }
 623
 624 void usb6fire_control_abort(struct sfire_chip *chip)
 625 {}
 626
 627 void usb6fire_control_destroy(struct sfire_chip *chip)
 628 {
 629         kfree(chip->control);
 630         chip->control = NULL;
 631 }