drivers/staging/line6/variax.c

   1 /*
   2  * Line6 Linux USB driver - 0.9.1beta
   3  *
   4  * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License as
   8  *      published by the Free Software Foundation, version 2.
   9  *
  10  */
  11
  12 #include <linux/slab.h>
  13
  14 #include "audio.h"
  15 #include "control.h"
  16 #include "driver.h"
  17 #include "variax.h"
  18
  19 #define VARIAX_SYSEX_CODE 7
  20 #define VARIAX_SYSEX_PARAM 0x3b
  21 #define VARIAX_SYSEX_ACTIVATE 0x2a
  22 #define VARIAX_MODEL_HEADER_LENGTH 7
  23 #define VARIAX_MODEL_MESSAGE_LENGTH 199
  24 #define VARIAX_OFFSET_ACTIVATE 7
  25
  26 /*
  27         This message is sent by the device during initialization and identifies
  28         the connected guitar model.
  29 */
  30 static const char variax_init_model[] = {
  31         0xf0, 0x00, 0x01, 0x0c, 0x07, 0x00, 0x69, 0x02,
  32         0x00
  33 };
  34
  35 /*
  36         This message is sent by the device during initialization and identifies
  37         the connected guitar version.
  38 */
  39 static const char variax_init_version[] = {
  40         0xf0, 0x7e, 0x7f, 0x06, 0x02, 0x00, 0x01, 0x0c,
  41         0x07, 0x00, 0x00, 0x00
  42 };
  43
  44 /*
  45         This message is the last one sent by the device during initialization.
  46 */
  47 static const char variax_init_done[] = {
  48         0xf0, 0x00, 0x01, 0x0c, 0x07, 0x00, 0x6b
  49 };
  50
  51 static const char variax_activate[] = {
  52         0xf0, 0x00, 0x01, 0x0c, 0x07, 0x00, 0x2a, 0x01,
  53         0xf7
  54 };
  55
  56 static const char variax_request_bank[] = {
  57         0xf0, 0x00, 0x01, 0x0c, 0x07, 0x00, 0x6d, 0xf7
  58 };
  59
  60 static const char variax_request_model1[] = {
  61         0xf0, 0x00, 0x01, 0x0c, 0x07, 0x00, 0x3c, 0x00,
  62         0x02, 0x00, 0x00, 0x00, 0x00, 0x03, 0x05, 0x03,
  63         0x00, 0x00, 0x00, 0xf7
  64 };
  65
  66 static const char variax_request_model2[] = {
  67         0xf0, 0x00, 0x01, 0x0c, 0x07, 0x00, 0x3c, 0x00,
  68         0x02, 0x00, 0x00, 0x00, 0x00, 0x03, 0x07, 0x03,
  69         0x00, 0x00, 0x00, 0xf7
  70 };
  71
  72 /* forward declarations: */
  73 static int variax_create_files2(struct device *dev);
  74 static void variax_startup2(unsigned long data);
  75 static void variax_startup4(unsigned long data);
  76 static void variax_startup5(unsigned long data);
  77
  78 /*
  79         Decode data transmitted by workbench.
  80 */
  81 static void variax_decode(const unsigned char *raw_data, unsigned char *data,
  82                           int raw_size)
  83 {
  84         for (; raw_size > 0; raw_size -= 6) {
  85                 data[2] = raw_data[0] | (raw_data[1] << 4);
  86                 data[1] = raw_data[2] | (raw_data[3] << 4);
  87                 data[0] = raw_data[4] | (raw_data[5] << 4);
  88                 raw_data += 6;
  89                 data += 3;
  90         }
  91 }
  92
  93 static void variax_activate_async(struct usb_line6_variax *variax, int a)
  94 {
  95         variax->buffer_activate[VARIAX_OFFSET_ACTIVATE] = a;
  96         line6_send_raw_message_async(&variax->line6, variax->buffer_activate,
  97                                      sizeof(variax_activate));
  98 }
  99
 100 /*
 101         Variax startup procedure.
 102         This is a sequence of functions with special requirements (e.g., must
 103         not run immediately after initialization, must not run in interrupt
 104         context). After the last one has finished, the device is ready to use.
 105 */
 106
 107 static void variax_startup1(struct usb_line6_variax *variax)
 108 {
 109         CHECK_STARTUP_PROGRESS(variax->startup_progress, VARIAX_STARTUP_INIT);
 110
 111         /* delay startup procedure: */
 112         line6_start_timer(&variax->startup_timer1, VARIAX_STARTUP_DELAY1,
 113                           variax_startup2, (unsigned long)variax);
 114 }
 115
 116 static void variax_startup2(unsigned long data)
 117 {
 118         struct usb_line6_variax *variax = (struct usb_line6_variax *)data;
 119         struct usb_line6 *line6 = &variax->line6;
 120
 121         /* schedule another startup procedure until startup is complete: */
 122         if (variax->startup_progress >= VARIAX_STARTUP_LAST)
 123                 return;
 124
 125         variax->startup_progress = VARIAX_STARTUP_VERSIONREQ;
 126         line6_start_timer(&variax->startup_timer1, VARIAX_STARTUP_DELAY1,
 127                           variax_startup2, (unsigned long)variax);
 128
 129         /* request firmware version: */
 130         line6_version_request_async(line6);
 131 }
 132
 133 static void variax_startup3(struct usb_line6_variax *variax)
 134 {
 135         CHECK_STARTUP_PROGRESS(variax->startup_progress, VARIAX_STARTUP_WAIT);
 136
 137         /* delay startup procedure: */
 138         line6_start_timer(&variax->startup_timer2, VARIAX_STARTUP_DELAY3,
 139                           variax_startup4, (unsigned long)variax);
 140 }
 141
 142 static void variax_startup4(unsigned long data)
 143 {
 144         struct usb_line6_variax *variax = (struct usb_line6_variax *)data;
 145         CHECK_STARTUP_PROGRESS(variax->startup_progress,
 146                                VARIAX_STARTUP_ACTIVATE);
 147
 148         /* activate device: */
 149         variax_activate_async(variax, 1);
 150         line6_start_timer(&variax->startup_timer2, VARIAX_STARTUP_DELAY4,
 151                           variax_startup5, (unsigned long)variax);
 152 }
 153
 154 static void variax_startup5(unsigned long data)
 155 {
 156         struct usb_line6_variax *variax = (struct usb_line6_variax *)data;
 157         CHECK_STARTUP_PROGRESS(variax->startup_progress,
 158                                VARIAX_STARTUP_DUMPREQ);
 159
 160         /* current model dump: */
 161         line6_dump_request_async(&variax->dumpreq, &variax->line6, 0,
 162                                  VARIAX_DUMP_PASS1);
 163         /* passes 2 and 3 are performed implicitly before entering variax_startup6 */
 164 }
 165
 166 static void variax_startup6(struct usb_line6_variax *variax)
 167 {
 168         CHECK_STARTUP_PROGRESS(variax->startup_progress,
 169                                VARIAX_STARTUP_WORKQUEUE);
 170
 171         /* schedule work for global work queue: */
 172         schedule_work(&variax->startup_work);
 173 }
 174
 175 static void variax_startup7(struct work_struct *work)
 176 {
 177         struct usb_line6_variax *variax =
 178             container_of(work, struct usb_line6_variax, startup_work);
 179         struct usb_line6 *line6 = &variax->line6;
 180
 181         CHECK_STARTUP_PROGRESS(variax->startup_progress, VARIAX_STARTUP_SETUP);
 182
 183         /* ALSA audio interface: */
 184         line6_register_audio(&variax->line6);
 185
 186         /* device files: */
 187         line6_variax_create_files(0, 0, line6->ifcdev);
 188         variax_create_files2(line6->ifcdev);
 189 }
 190
 191 /*
 192         Process a completely received message.
 193 */
 194 void line6_variax_process_message(struct usb_line6_variax *variax)
 195 {
 196         const unsigned char *buf = variax->line6.buffer_message;
 197
 198         switch (buf[0]) {
 199         case LINE6_PARAM_CHANGE | LINE6_CHANNEL_HOST:
 200                 switch (buf[1]) {
 201                 case VARIAXMIDI_volume:
 202                         variax->volume = buf[2];
 203                         break;
 204
 205                 case VARIAXMIDI_tone:
 206                         variax->tone = buf[2];
 207                 }
 208
 209                 break;
 210
 211         case LINE6_PROGRAM_CHANGE | LINE6_CHANNEL_DEVICE:
 212         case LINE6_PROGRAM_CHANGE | LINE6_CHANNEL_HOST:
 213                 variax->model = buf[1];
 214                 line6_dump_request_async(&variax->dumpreq, &variax->line6, 0,
 215                                          VARIAX_DUMP_PASS1);
 216                 break;
 217
 218         case LINE6_RESET:
 219                 dev_info(variax->line6.ifcdev, "VARIAX reset\n");
 220                 break;
 221
 222         case LINE6_SYSEX_BEGIN:
 223                 if (memcmp(buf + 1, variax_request_model1 + 1,
 224                            VARIAX_MODEL_HEADER_LENGTH - 1) == 0) {
 225                         if (variax->line6.message_length ==
 226                             VARIAX_MODEL_MESSAGE_LENGTH) {
 227                                 switch (variax->dumpreq.in_progress) {
 228                                 case VARIAX_DUMP_PASS1:
 229                                         variax_decode(buf +
 230                                                       VARIAX_MODEL_HEADER_LENGTH,
 231                                                       (unsigned char *)
 232                                                       &variax->model_data,
 233                                                       (sizeof
 234                                                        (variax->model_data.
 235                                                         name) +
 236                                                        sizeof(variax->
 237                                                               model_data.
 238                                                               control)
 239                                                        / 2) * 2);
 240                                         line6_dump_request_async
 241                                             (&variax->dumpreq, &variax->line6,
 242                                              1, VARIAX_DUMP_PASS2);
 243                                         break;
 244
 245                                 case VARIAX_DUMP_PASS2:
 246                                         /* model name is transmitted twice, so skip it here: */
 247                                         variax_decode(buf +
 248                                                       VARIAX_MODEL_HEADER_LENGTH,
 249                                                       (unsigned char *)
 250                                                       &variax->
 251                                                       model_data.control +
 252                                                       sizeof(variax->model_data.
 253                                                              control)
 254                                                       / 2,
 255                                                       sizeof(variax->model_data.
 256                                                              control)
 257                                                       / 2 * 2);
 258                                         line6_dump_request_async
 259                                             (&variax->dumpreq, &variax->line6,
 260                                              2, VARIAX_DUMP_PASS3);
 261                                 }
 262                         } else {
 263                                 DEBUG_MESSAGES(dev_err
 264                                                (variax->line6.ifcdev,
 265                                                 "illegal length %d of model data\n",
 266                                                 variax->line6.message_length));
 267                                 line6_dump_finished(&variax->dumpreq);
 268                         }
 269                 } else if (memcmp(buf + 1, variax_request_bank + 1,
 270                                   sizeof(variax_request_bank) - 2) == 0) {
 271                         memcpy(variax->bank,
 272                                buf + sizeof(variax_request_bank) - 1,
 273                                sizeof(variax->bank));
 274                         line6_dump_finished(&variax->dumpreq);
 275                         variax_startup6(variax);
 276                 } else if (memcmp(buf + 1, variax_init_model + 1,
 277                                   sizeof(variax_init_model) - 1) == 0) {
 278                         memcpy(variax->guitar,
 279                                buf + sizeof(variax_init_model),
 280                                sizeof(variax->guitar));
 281                 } else if (memcmp(buf + 1, variax_init_version + 1,
 282                                   sizeof(variax_init_version) - 1) == 0) {
 283                         variax_startup3(variax);
 284                 } else if (memcmp(buf + 1, variax_init_done + 1,
 285                                   sizeof(variax_init_done) - 1) == 0) {
 286                         /* notify of complete initialization: */
 287                         variax_startup4((unsigned long)variax);
 288                 }
 289
 290                 break;
 291
 292         case LINE6_SYSEX_END:
 293                 break;
 294
 295         default:
 296                 DEBUG_MESSAGES(dev_err
 297                                (variax->line6.ifcdev,
 298                                 "Variax: unknown message %02X\n", buf[0]));
 299         }
 300 }
 301
 302 /*
 303         "read" request on "volume" special file.
 304 */
 305 static ssize_t variax_get_volume(struct device *dev,
 306                                  struct device_attribute *attr, char *buf)
 307 {
 308         struct usb_line6_variax *variax =
 309             usb_get_intfdata(to_usb_interface(dev));
 310         return sprintf(buf, "%d\n", variax->volume);
 311 }
 312
 313 /*
 314         "write" request on "volume" special file.
 315 */
 316 static ssize_t variax_set_volume(struct device *dev,
 317                                  struct device_attribute *attr,
 318                                  const char *buf, size_t count)
 319 {
 320         struct usb_line6_variax *variax =
 321             usb_get_intfdata(to_usb_interface(dev));
 322         unsigned long value;
 323         int ret;
 324
 325         ret = strict_strtoul(buf, 10, &value);
 326         if (ret)
 327                 return ret;
 328
 329         if (line6_transmit_parameter(&variax->line6, VARIAXMIDI_volume,
 330                                      value) == 0)
 331                 variax->volume = value;
 332
 333         return count;
 334 }
 335
 336 /*
 337         "read" request on "model" special file.
 338 */
 339 static ssize_t variax_get_model(struct device *dev,
 340                                 struct device_attribute *attr, char *buf)
 341 {
 342         struct usb_line6_variax *variax =
 343             usb_get_intfdata(to_usb_interface(dev));
 344         return sprintf(buf, "%d\n", variax->model);
 345 }
 346
 347 /*
 348         "write" request on "model" special file.
 349 */
 350 static ssize_t variax_set_model(struct device *dev,
 351                                 struct device_attribute *attr,
 352                                 const char *buf, size_t count)
 353 {
 354         struct usb_line6_variax *variax =
 355             usb_get_intfdata(to_usb_interface(dev));
 356         unsigned long value;
 357         int ret;
 358
 359         ret = strict_strtoul(buf, 10, &value);
 360         if (ret)
 361                 return ret;
 362
 363         if (line6_send_program(&variax->line6, value) == 0)
 364                 variax->model = value;
 365
 366         return count;
 367 }
 368
 369 /*
 370         "read" request on "active" special file.
 371 */
 372 static ssize_t variax_get_active(struct device *dev,
 373                                  struct device_attribute *attr, char *buf)
 374 {
 375         struct usb_line6_variax *variax =
 376             usb_get_intfdata(to_usb_interface(dev));
 377         return sprintf(buf, "%d\n",
 378                        variax->buffer_activate[VARIAX_OFFSET_ACTIVATE]);
 379 }
 380
 381 /*
 382         "write" request on "active" special file.
 383 */
 384 static ssize_t variax_set_active(struct device *dev,
 385                                  struct device_attribute *attr,
 386                                  const char *buf, size_t count)
 387 {
 388         struct usb_line6_variax *variax =
 389             usb_get_intfdata(to_usb_interface(dev));
 390         unsigned long value;
 391         int ret;
 392
 393         ret = strict_strtoul(buf, 10, &value);
 394         if (ret)
 395                 return ret;
 396
 397         variax_activate_async(variax, value ? 1 : 0);
 398         return count;
 399 }
 400
 401 /*
 402         "read" request on "tone" special file.
 403 */
 404 static ssize_t variax_get_tone(struct device *dev,
 405                                struct device_attribute *attr, char *buf)
 406 {
 407         struct usb_line6_variax *variax =
 408             usb_get_intfdata(to_usb_interface(dev));
 409         return sprintf(buf, "%d\n", variax->tone);
 410 }
 411
 412 /*
 413         "write" request on "tone" special file.
 414 */
 415 static ssize_t variax_set_tone(struct device *dev,
 416                                struct device_attribute *attr,
 417                                const char *buf, size_t count)
 418 {
 419         struct usb_line6_variax *variax =
 420             usb_get_intfdata(to_usb_interface(dev));
 421         unsigned long value;
 422         int ret;
 423
 424         ret = strict_strtoul(buf, 10, &value);
 425         if (ret)
 426                 return ret;
 427
 428         if (line6_transmit_parameter(&variax->line6, VARIAXMIDI_tone,
 429                                      value) == 0)
 430                 variax->tone = value;
 431
 432         return count;
 433 }
 434
 435 static ssize_t get_string(char *buf, const char *data, int length)
 436 {
 437         int i;
 438         memcpy(buf, data, length);
 439
 440         for (i = length; i--;) {
 441                 char c = buf[i];
 442
 443                 if ((c != 0) && (c != ' '))
 444                         break;
 445         }
 446
 447         buf[i + 1] = '\n';
 448         return i + 2;
 449 }
 450
 451 /*
 452         "read" request on "name" special file.
 453 */
 454 static ssize_t variax_get_name(struct device *dev,
 455                                struct device_attribute *attr, char *buf)
 456 {
 457         struct usb_line6_variax *variax =
 458             usb_get_intfdata(to_usb_interface(dev));
 459         line6_dump_wait_interruptible(&variax->dumpreq);
 460         return get_string(buf, variax->model_data.name,
 461                           sizeof(variax->model_data.name));
 462 }
 463
 464 /*
 465         "read" request on "bank" special file.
 466 */
 467 static ssize_t variax_get_bank(struct device *dev,
 468                                struct device_attribute *attr, char *buf)
 469 {
 470         struct usb_line6_variax *variax =
 471             usb_get_intfdata(to_usb_interface(dev));
 472         line6_dump_wait_interruptible(&variax->dumpreq);
 473         return get_string(buf, variax->bank, sizeof(variax->bank));
 474 }
 475
 476 /*
 477         "read" request on "dump" special file.
 478 */
 479 static ssize_t variax_get_dump(struct device *dev,
 480                                struct device_attribute *attr, char *buf)
 481 {
 482         struct usb_line6_variax *variax =
 483             usb_get_intfdata(to_usb_interface(dev));
 484         int retval;
 485         retval = line6_dump_wait_interruptible(&variax->dumpreq);
 486         if (retval < 0)
 487                 return retval;
 488         memcpy(buf, &variax->model_data.control,
 489                sizeof(variax->model_data.control));
 490         return sizeof(variax->model_data.control);
 491 }
 492
 493 /*
 494         "read" request on "guitar" special file.
 495 */
 496 static ssize_t variax_get_guitar(struct device *dev,
 497                                  struct device_attribute *attr, char *buf)
 498 {
 499         struct usb_line6_variax *variax =
 500             usb_get_intfdata(to_usb_interface(dev));
 501         return sprintf(buf, "%s\n", variax->guitar);
 502 }
 503
 504 #ifdef CONFIG_LINE6_USB_RAW
 505
 506 static char *variax_alloc_sysex_buffer(struct usb_line6_variax *variax,
 507                                        int code, int size)
 508 {
 509         return line6_alloc_sysex_buffer(&variax->line6, VARIAX_SYSEX_CODE, code,
 510                                         size);
 511 }
 512
 513 /*
 514         "write" request on "raw" special file.
 515 */
 516 static ssize_t variax_set_raw2(struct device *dev,
 517                                struct device_attribute *attr,
 518                                const char *buf, size_t count)
 519 {
 520         struct usb_line6_variax *variax =
 521             usb_get_intfdata(to_usb_interface(dev));
 522         int size;
 523         int i;
 524         char *sysex;
 525
 526         count -= count % 3;
 527         size = count * 2;
 528         sysex = variax_alloc_sysex_buffer(variax, VARIAX_SYSEX_PARAM, size);
 529
 530         if (!sysex)
 531                 return 0;
 532
 533         for (i = 0; i < count; i += 3) {
 534                 const unsigned char *p1 = buf + i;
 535                 char *p2 = sysex + SYSEX_DATA_OFS + i * 2;
 536                 p2[0] = p1[2] & 0x0f;
 537                 p2[1] = p1[2] >> 4;
 538                 p2[2] = p1[1] & 0x0f;
 539                 p2[3] = p1[1] >> 4;
 540                 p2[4] = p1[0] & 0x0f;
 541                 p2[5] = p1[0] >> 4;
 542         }
 543
 544         line6_send_sysex_message(&variax->line6, sysex, size);
 545         kfree(sysex);
 546         return count;
 547 }
 548
 549 #endif
 550
 551 /* Variax workbench special files: */
 552 static DEVICE_ATTR(model, S_IWUSR | S_IRUGO, variax_get_model,
 553                    variax_set_model);
 554 static DEVICE_ATTR(volume, S_IWUSR | S_IRUGO, variax_get_volume,
 555                    variax_set_volume);
 556 static DEVICE_ATTR(tone, S_IWUSR | S_IRUGO, variax_get_tone, variax_set_tone);
 557 static DEVICE_ATTR(name, S_IRUGO, variax_get_name, line6_nop_write);
 558 static DEVICE_ATTR(bank, S_IRUGO, variax_get_bank, line6_nop_write);
 559 static DEVICE_ATTR(dump, S_IRUGO, variax_get_dump, line6_nop_write);
 560 static DEVICE_ATTR(active, S_IWUSR | S_IRUGO, variax_get_active,
 561                    variax_set_active);
 562 static DEVICE_ATTR(guitar, S_IRUGO, variax_get_guitar, line6_nop_write);
 563
 564 #ifdef CONFIG_LINE6_USB_RAW
 565 static DEVICE_ATTR(raw, S_IWUSR, line6_nop_read, line6_set_raw);
 566 static DEVICE_ATTR(raw2, S_IWUSR, line6_nop_read, variax_set_raw2);
 567 #endif
 568
 569 /*
 570         Variax destructor.
 571 */
 572 static void variax_destruct(struct usb_interface *interface)
 573 {
 574         struct usb_line6_variax *variax = usb_get_intfdata(interface);
 575
 576         if (variax == NULL)
 577                 return;
 578         line6_cleanup_audio(&variax->line6);
 579
 580         del_timer(&variax->startup_timer1);
 581         del_timer(&variax->startup_timer2);
 582         cancel_work_sync(&variax->startup_work);
 583
 584         /* free dump request data: */
 585         line6_dumpreq_destructbuf(&variax->dumpreq, 2);
 586         line6_dumpreq_destructbuf(&variax->dumpreq, 1);
 587         line6_dumpreq_destruct(&variax->dumpreq);
 588
 589         kfree(variax->buffer_activate);
 590 }
 591
 592 /*
 593         Create sysfs entries.
 594 */
 595 static int variax_create_files2(struct device *dev)
 596 {
 597         int err;
 598         CHECK_RETURN(device_create_file(dev, &dev_attr_model));
 599         CHECK_RETURN(device_create_file(dev, &dev_attr_volume));
 600         CHECK_RETURN(device_create_file(dev, &dev_attr_tone));
 601         CHECK_RETURN(device_create_file(dev, &dev_attr_name));
 602         CHECK_RETURN(device_create_file(dev, &dev_attr_bank));
 603         CHECK_RETURN(device_create_file(dev, &dev_attr_dump));
 604         CHECK_RETURN(device_create_file(dev, &dev_attr_active));
 605         CHECK_RETURN(device_create_file(dev, &dev_attr_guitar));
 606 #ifdef CONFIG_LINE6_USB_RAW
 607         CHECK_RETURN(device_create_file(dev, &dev_attr_raw));
 608         CHECK_RETURN(device_create_file(dev, &dev_attr_raw2));
 609 #endif
 610         return 0;
 611 }
 612
 613 /*
 614          Try to init workbench device.
 615 */
 616 static int variax_try_init(struct usb_interface *interface,
 617                            struct usb_line6_variax *variax)
 618 {
 619         int err;
 620
 621         init_timer(&variax->startup_timer1);
 622         init_timer(&variax->startup_timer2);
 623         INIT_WORK(&variax->startup_work, variax_startup7);
 624
 625         if ((interface == NULL) || (variax == NULL))
 626                 return -ENODEV;
 627
 628         /* initialize USB buffers: */
 629         err = line6_dumpreq_init(&variax->dumpreq, variax_request_model1,
 630                                  sizeof(variax_request_model1));
 631
 632         if (err < 0) {
 633                 dev_err(&interface->dev, "Out of memory\n");
 634                 return err;
 635         }
 636
 637         err = line6_dumpreq_initbuf(&variax->dumpreq, variax_request_model2,
 638                                     sizeof(variax_request_model2), 1);
 639
 640         if (err < 0) {
 641                 dev_err(&interface->dev, "Out of memory\n");
 642                 return err;
 643         }
 644
 645         err = line6_dumpreq_initbuf(&variax->dumpreq, variax_request_bank,
 646                                     sizeof(variax_request_bank), 2);
 647
 648         if (err < 0) {
 649                 dev_err(&interface->dev, "Out of memory\n");
 650                 return err;
 651         }
 652
 653         variax->buffer_activate = kmemdup(variax_activate,
 654                                           sizeof(variax_activate), GFP_KERNEL);
 655
 656         if (variax->buffer_activate == NULL) {
 657                 dev_err(&interface->dev, "Out of memory\n");
 658                 return -ENOMEM;
 659         }
 660
 661         /* initialize audio system: */
 662         err = line6_init_audio(&variax->line6);
 663         if (err < 0)
 664                 return err;
 665
 666         /* initialize MIDI subsystem: */
 667         err = line6_init_midi(&variax->line6);
 668         if (err < 0)
 669                 return err;
 670
 671         /* initiate startup procedure: */
 672         variax_startup1(variax);
 673         return 0;
 674 }
 675
 676 /*
 677          Init workbench device (and clean up in case of failure).
 678 */
 679 int line6_variax_init(struct usb_interface *interface,
 680                       struct usb_line6_variax *variax)
 681 {
 682         int err = variax_try_init(interface, variax);
 683
 684         if (err < 0)
 685                 variax_destruct(interface);
 686
 687         return err;
 688 }
 689
 690 /*
 691         Workbench device disconnected.
 692 */
 693 void line6_variax_disconnect(struct usb_interface *interface)
 694 {
 695         struct device *dev;
 696
 697         if (interface == NULL)
 698                 return;
 699         dev = &interface->dev;
 700
 701         if (dev != NULL) {
 702                 /* remove sysfs entries: */
 703                 line6_variax_remove_files(0, 0, dev);
 704                 device_remove_file(dev, &dev_attr_model);
 705                 device_remove_file(dev, &dev_attr_volume);
 706                 device_remove_file(dev, &dev_attr_tone);
 707                 device_remove_file(dev, &dev_attr_name);
 708                 device_remove_file(dev, &dev_attr_bank);
 709                 device_remove_file(dev, &dev_attr_dump);
 710                 device_remove_file(dev, &dev_attr_active);
 711                 device_remove_file(dev, &dev_attr_guitar);
 712 #ifdef CONFIG_LINE6_USB_RAW
 713                 device_remove_file(dev, &dev_attr_raw);
 714                 device_remove_file(dev, &dev_attr_raw2);
 715 #endif
 716         }
 717
 718         variax_destruct(interface);
 719 }