sound/usb/line6/driver.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/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/export.h>
  15 #include <linux/slab.h>
  16 #include <linux/usb.h>
  17
  18 #include <sound/core.h>
  19 #include <sound/initval.h>
  20
  21 #include "capture.h"
  22 #include "driver.h"
  23 #include "midi.h"
  24 #include "playback.h"
  25 #include "revision.h"
  26 #include "usbdefs.h"
  27
  28 #define DRIVER_AUTHOR  "Markus Grabner <grabner@icg.tugraz.at>"
  29 #define DRIVER_DESC    "Line6 USB Driver"
  30 #define DRIVER_VERSION "0.9.1beta" DRIVER_REVISION
  31
  32 /*
  33         This is Line6's MIDI manufacturer ID.
  34 */
  35 const unsigned char line6_midi_id[] = {
  36         0x00, 0x01, 0x0c
  37 };
  38 EXPORT_SYMBOL_GPL(line6_midi_id);
  39
  40 /*
  41         Code to request version of POD, Variax interface
  42         (and maybe other devices).
  43 */
  44 static const char line6_request_version[] = {
  45         0xf0, 0x7e, 0x7f, 0x06, 0x01, 0xf7
  46 };
  47
  48 /**
  49          Class for asynchronous messages.
  50 */
  51 struct message {
  52         struct usb_line6 *line6;
  53         const char *buffer;
  54         int size;
  55         int done;
  56 };
  57
  58 /*
  59         Forward declarations.
  60 */
  61 static void line6_data_received(struct urb *urb);
  62 static int line6_send_raw_message_async_part(struct message *msg,
  63                                              struct urb *urb);
  64
  65 /*
  66         Start to listen on endpoint.
  67 */
  68 static int line6_start_listen(struct usb_line6 *line6)
  69 {
  70         int err;
  71
  72         usb_fill_int_urb(line6->urb_listen, line6->usbdev,
  73                 usb_rcvintpipe(line6->usbdev, line6->properties->ep_ctrl_r),
  74                 line6->buffer_listen, LINE6_BUFSIZE_LISTEN,
  75                 line6_data_received, line6, line6->interval);
  76         line6->urb_listen->actual_length = 0;
  77         err = usb_submit_urb(line6->urb_listen, GFP_ATOMIC);
  78         return err;
  79 }
  80
  81 /*
  82         Stop listening on endpoint.
  83 */
  84 static void line6_stop_listen(struct usb_line6 *line6)
  85 {
  86         usb_kill_urb(line6->urb_listen);
  87 }
  88
  89 /*
  90         Send raw message in pieces of wMaxPacketSize bytes.
  91 */
  92 int line6_send_raw_message(struct usb_line6 *line6, const char *buffer,
  93                            int size)
  94 {
  95         int i, done = 0;
  96
  97         for (i = 0; i < size; i += line6->max_packet_size) {
  98                 int partial;
  99                 const char *frag_buf = buffer + i;
 100                 int frag_size = min(line6->max_packet_size, size - i);
 101                 int retval;
 102
 103                 retval = usb_interrupt_msg(line6->usbdev,
 104                                         usb_sndintpipe(line6->usbdev,
 105                                                 line6->properties->ep_ctrl_w),
 106                                         (char *)frag_buf, frag_size,
 107                                         &partial, LINE6_TIMEOUT * HZ);
 108
 109                 if (retval) {
 110                         dev_err(line6->ifcdev,
 111                                 "usb_interrupt_msg failed (%d)\n", retval);
 112                         break;
 113                 }
 114
 115                 done += frag_size;
 116         }
 117
 118         return done;
 119 }
 120
 121 /*
 122         Notification of completion of asynchronous request transmission.
 123 */
 124 static void line6_async_request_sent(struct urb *urb)
 125 {
 126         struct message *msg = (struct message *)urb->context;
 127
 128         if (msg->done >= msg->size) {
 129                 usb_free_urb(urb);
 130                 kfree(msg);
 131         } else
 132                 line6_send_raw_message_async_part(msg, urb);
 133 }
 134
 135 /*
 136         Asynchronously send part of a raw message.
 137 */
 138 static int line6_send_raw_message_async_part(struct message *msg,
 139                                              struct urb *urb)
 140 {
 141         int retval;
 142         struct usb_line6 *line6 = msg->line6;
 143         int done = msg->done;
 144         int bytes = min(msg->size - done, line6->max_packet_size);
 145
 146         usb_fill_int_urb(urb, line6->usbdev,
 147                 usb_sndintpipe(line6->usbdev, line6->properties->ep_ctrl_w),
 148                 (char *)msg->buffer + done, bytes,
 149                 line6_async_request_sent, msg, line6->interval);
 150
 151         msg->done += bytes;
 152         retval = usb_submit_urb(urb, GFP_ATOMIC);
 153
 154         if (retval < 0) {
 155                 dev_err(line6->ifcdev, "%s: usb_submit_urb failed (%d)\n",
 156                         __func__, retval);
 157                 usb_free_urb(urb);
 158                 kfree(msg);
 159                 return retval;
 160         }
 161
 162         return 0;
 163 }
 164
 165 /*
 166         Setup and start timer.
 167 */
 168 void line6_start_timer(struct timer_list *timer, unsigned int msecs,
 169                        void (*function)(unsigned long), unsigned long data)
 170 {
 171         setup_timer(timer, function, data);
 172         mod_timer(timer, jiffies + msecs * HZ / 1000);
 173 }
 174 EXPORT_SYMBOL_GPL(line6_start_timer);
 175
 176 /*
 177         Asynchronously send raw message.
 178 */
 179 int line6_send_raw_message_async(struct usb_line6 *line6, const char *buffer,
 180                                  int size)
 181 {
 182         struct message *msg;
 183         struct urb *urb;
 184
 185         /* create message: */
 186         msg = kmalloc(sizeof(struct message), GFP_ATOMIC);
 187         if (msg == NULL)
 188                 return -ENOMEM;
 189
 190         /* create URB: */
 191         urb = usb_alloc_urb(0, GFP_ATOMIC);
 192
 193         if (urb == NULL) {
 194                 kfree(msg);
 195                 return -ENOMEM;
 196         }
 197
 198         /* set message data: */
 199         msg->line6 = line6;
 200         msg->buffer = buffer;
 201         msg->size = size;
 202         msg->done = 0;
 203
 204         /* start sending: */
 205         return line6_send_raw_message_async_part(msg, urb);
 206 }
 207 EXPORT_SYMBOL_GPL(line6_send_raw_message_async);
 208
 209 /*
 210         Send asynchronous device version request.
 211 */
 212 int line6_version_request_async(struct usb_line6 *line6)
 213 {
 214         char *buffer;
 215         int retval;
 216
 217         buffer = kmemdup(line6_request_version,
 218                         sizeof(line6_request_version), GFP_ATOMIC);
 219         if (buffer == NULL)
 220                 return -ENOMEM;
 221
 222         retval = line6_send_raw_message_async(line6, buffer,
 223                                               sizeof(line6_request_version));
 224         kfree(buffer);
 225         return retval;
 226 }
 227 EXPORT_SYMBOL_GPL(line6_version_request_async);
 228
 229 /*
 230         Send sysex message in pieces of wMaxPacketSize bytes.
 231 */
 232 int line6_send_sysex_message(struct usb_line6 *line6, const char *buffer,
 233                              int size)
 234 {
 235         return line6_send_raw_message(line6, buffer,
 236                                       size + SYSEX_EXTRA_SIZE) -
 237             SYSEX_EXTRA_SIZE;
 238 }
 239 EXPORT_SYMBOL_GPL(line6_send_sysex_message);
 240
 241 /*
 242         Allocate buffer for sysex message and prepare header.
 243         @param code sysex message code
 244         @param size number of bytes between code and sysex end
 245 */
 246 char *line6_alloc_sysex_buffer(struct usb_line6 *line6, int code1, int code2,
 247                                int size)
 248 {
 249         char *buffer = kmalloc(size + SYSEX_EXTRA_SIZE, GFP_ATOMIC);
 250
 251         if (!buffer)
 252                 return NULL;
 253
 254         buffer[0] = LINE6_SYSEX_BEGIN;
 255         memcpy(buffer + 1, line6_midi_id, sizeof(line6_midi_id));
 256         buffer[sizeof(line6_midi_id) + 1] = code1;
 257         buffer[sizeof(line6_midi_id) + 2] = code2;
 258         buffer[sizeof(line6_midi_id) + 3 + size] = LINE6_SYSEX_END;
 259         return buffer;
 260 }
 261 EXPORT_SYMBOL_GPL(line6_alloc_sysex_buffer);
 262
 263 /*
 264         Notification of data received from the Line6 device.
 265 */
 266 static void line6_data_received(struct urb *urb)
 267 {
 268         struct usb_line6 *line6 = (struct usb_line6 *)urb->context;
 269         struct midi_buffer *mb = &line6->line6midi->midibuf_in;
 270         int done;
 271
 272         if (urb->status == -ESHUTDOWN)
 273                 return;
 274
 275         done =
 276             line6_midibuf_write(mb, urb->transfer_buffer, urb->actual_length);
 277
 278         if (done < urb->actual_length) {
 279                 line6_midibuf_ignore(mb, done);
 280                 dev_dbg(line6->ifcdev, "%d %d buffer overflow - message skipped\n",
 281                         done, urb->actual_length);
 282         }
 283
 284         for (;;) {
 285                 done =
 286                     line6_midibuf_read(mb, line6->buffer_message,
 287                                        LINE6_MESSAGE_MAXLEN);
 288
 289                 if (done == 0)
 290                         break;
 291
 292                 line6->message_length = done;
 293                 line6_midi_receive(line6, line6->buffer_message, done);
 294
 295                 if (line6->process_message)
 296                         line6->process_message(line6);
 297         }
 298
 299         line6_start_listen(line6);
 300 }
 301
 302 /*
 303         Send channel number (i.e., switch to a different sound).
 304 */
 305 int line6_send_program(struct usb_line6 *line6, u8 value)
 306 {
 307         int retval;
 308         unsigned char *buffer;
 309         int partial;
 310
 311         buffer = kmalloc(2, GFP_KERNEL);
 312         if (!buffer)
 313                 return -ENOMEM;
 314
 315         buffer[0] = LINE6_PROGRAM_CHANGE | LINE6_CHANNEL_HOST;
 316         buffer[1] = value;
 317
 318         retval = usb_interrupt_msg(line6->usbdev,
 319                                    usb_sndintpipe(line6->usbdev,
 320                                                   line6->properties->ep_ctrl_w),
 321                                    buffer, 2, &partial, LINE6_TIMEOUT * HZ);
 322
 323         if (retval)
 324                 dev_err(line6->ifcdev, "usb_interrupt_msg failed (%d)\n",
 325                         retval);
 326
 327         kfree(buffer);
 328         return retval;
 329 }
 330
 331 /*
 332         Transmit Line6 control parameter.
 333 */
 334 int line6_transmit_parameter(struct usb_line6 *line6, int param, u8 value)
 335 {
 336         int retval;
 337         unsigned char *buffer;
 338         int partial;
 339
 340         buffer = kmalloc(3, GFP_KERNEL);
 341         if (!buffer)
 342                 return -ENOMEM;
 343
 344         buffer[0] = LINE6_PARAM_CHANGE | LINE6_CHANNEL_HOST;
 345         buffer[1] = param;
 346         buffer[2] = value;
 347
 348         retval = usb_interrupt_msg(line6->usbdev,
 349                                    usb_sndintpipe(line6->usbdev,
 350                                                   line6->properties->ep_ctrl_w),
 351                                    buffer, 3, &partial, LINE6_TIMEOUT * HZ);
 352
 353         if (retval)
 354                 dev_err(line6->ifcdev, "usb_interrupt_msg failed (%d)\n",
 355                         retval);
 356
 357         kfree(buffer);
 358         return retval;
 359 }
 360
 361 /*
 362         Read data from device.
 363 */
 364 int line6_read_data(struct usb_line6 *line6, int address, void *data,
 365                     size_t datalen)
 366 {
 367         struct usb_device *usbdev = line6->usbdev;
 368         int ret;
 369         unsigned char len;
 370
 371         /* query the serial number: */
 372         ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x67,
 373                               USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
 374                               (datalen << 8) | 0x21, address,
 375                               NULL, 0, LINE6_TIMEOUT * HZ);
 376
 377         if (ret < 0) {
 378                 dev_err(line6->ifcdev, "read request failed (error %d)\n", ret);
 379                 return ret;
 380         }
 381
 382         /* Wait for data length. We'll get 0xff until length arrives. */
 383         do {
 384                 ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
 385                                       USB_TYPE_VENDOR | USB_RECIP_DEVICE |
 386                                       USB_DIR_IN,
 387                                       0x0012, 0x0000, &len, 1,
 388                                       LINE6_TIMEOUT * HZ);
 389                 if (ret < 0) {
 390                         dev_err(line6->ifcdev,
 391                                 "receive length failed (error %d)\n", ret);
 392                         return ret;
 393                 }
 394         } while (len == 0xff);
 395
 396         if (len != datalen) {
 397                 /* should be equal or something went wrong */
 398                 dev_err(line6->ifcdev,
 399                         "length mismatch (expected %d, got %d)\n",
 400                         (int)datalen, (int)len);
 401                 return -EINVAL;
 402         }
 403
 404         /* receive the result: */
 405         ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
 406                               USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 407                               0x0013, 0x0000, data, datalen,
 408                               LINE6_TIMEOUT * HZ);
 409
 410         if (ret < 0) {
 411                 dev_err(line6->ifcdev, "read failed (error %d)\n", ret);
 412                 return ret;
 413         }
 414
 415         return 0;
 416 }
 417 EXPORT_SYMBOL_GPL(line6_read_data);
 418
 419 /*
 420         Write data to device.
 421 */
 422 int line6_write_data(struct usb_line6 *line6, int address, void *data,
 423                      size_t datalen)
 424 {
 425         struct usb_device *usbdev = line6->usbdev;
 426         int ret;
 427         unsigned char status;
 428
 429         ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x67,
 430                               USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
 431                               0x0022, address, data, datalen,
 432                               LINE6_TIMEOUT * HZ);
 433
 434         if (ret < 0) {
 435                 dev_err(line6->ifcdev,
 436                         "write request failed (error %d)\n", ret);
 437                 return ret;
 438         }
 439
 440         do {
 441                 ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
 442                                       0x67,
 443                                       USB_TYPE_VENDOR | USB_RECIP_DEVICE |
 444                                       USB_DIR_IN,
 445                                       0x0012, 0x0000,
 446                                       &status, 1, LINE6_TIMEOUT * HZ);
 447
 448                 if (ret < 0) {
 449                         dev_err(line6->ifcdev,
 450                                 "receiving status failed (error %d)\n", ret);
 451                         return ret;
 452                 }
 453         } while (status == 0xff);
 454
 455         if (status != 0) {
 456                 dev_err(line6->ifcdev, "write failed (error %d)\n", ret);
 457                 return -EINVAL;
 458         }
 459
 460         return 0;
 461 }
 462 EXPORT_SYMBOL_GPL(line6_write_data);
 463
 464 /*
 465         Read Line6 device serial number.
 466         (POD, TonePort, GuitarPort)
 467 */
 468 int line6_read_serial_number(struct usb_line6 *line6, int *serial_number)
 469 {
 470         return line6_read_data(line6, 0x80d0, serial_number,
 471                                sizeof(*serial_number));
 472 }
 473 EXPORT_SYMBOL_GPL(line6_read_serial_number);
 474
 475 /*
 476         No operation (i.e., unsupported).
 477 */
 478 ssize_t line6_nop_read(struct device *dev, struct device_attribute *attr,
 479                        char *buf)
 480 {
 481         return 0;
 482 }
 483 EXPORT_SYMBOL_GPL(line6_nop_read);
 484
 485 /*
 486         Card destructor.
 487 */
 488 static void line6_destruct(struct snd_card *card)
 489 {
 490         struct usb_line6 *line6 = card->private_data;
 491         struct usb_device *usbdev;
 492
 493         if (!line6)
 494                 return;
 495         usbdev = line6->usbdev;
 496
 497         /* free buffer memory first: */
 498         kfree(line6->buffer_message);
 499         kfree(line6->buffer_listen);
 500
 501         /* then free URBs: */
 502         usb_free_urb(line6->urb_listen);
 503
 504         /* free interface data: */
 505         kfree(line6);
 506
 507         /* decrement reference counters: */
 508         usb_put_dev(usbdev);
 509 }
 510
 511 /*
 512         Probe USB device.
 513 */
 514 int line6_probe(struct usb_interface *interface,
 515                 struct usb_line6 *line6,
 516                 const struct line6_properties *properties,
 517                 int (*private_init)(struct usb_interface *, struct usb_line6 *))
 518 {
 519         struct usb_device *usbdev;
 520         struct snd_card *card;
 521         int interface_number;
 522         int ret;
 523
 524         if (!interface) {
 525                 ret = -ENODEV;
 526                 goto err_put;
 527         }
 528         usbdev = interface_to_usbdev(interface);
 529         if (!usbdev) {
 530                 ret = -ENODEV;
 531                 goto err_put;
 532         }
 533
 534         /* we don't handle multiple configurations */
 535         if (usbdev->descriptor.bNumConfigurations != 1) {
 536                 ret = -ENODEV;
 537                 goto err_put;
 538         }
 539
 540         /* initialize device info: */
 541         dev_info(&interface->dev, "Line6 %s found\n", properties->name);
 542
 543         /* query interface number */
 544         interface_number = interface->cur_altsetting->desc.bInterfaceNumber;
 545
 546         ret = usb_set_interface(usbdev, interface_number,
 547                         properties->altsetting);
 548         if (ret < 0) {
 549                 dev_err(&interface->dev, "set_interface failed\n");
 550                 goto err_put;
 551         }
 552
 553         /* store basic data: */
 554         line6->properties = properties;
 555         line6->usbdev = usbdev;
 556         line6->ifcdev = &interface->dev;
 557
 558         /* get data from endpoint descriptor (see usb_maxpacket): */
 559         {
 560                 struct usb_host_endpoint *ep;
 561                 unsigned pipe = usb_rcvintpipe(usbdev, properties->ep_ctrl_r);
 562                 unsigned epnum = usb_pipeendpoint(pipe);
 563                 ep = usbdev->ep_in[epnum];
 564
 565                 if (ep != NULL) {
 566                         line6->interval = ep->desc.bInterval;
 567                         line6->max_packet_size =
 568                             le16_to_cpu(ep->desc.wMaxPacketSize);
 569                 } else {
 570                         line6->interval = LINE6_FALLBACK_INTERVAL;
 571                         line6->max_packet_size = LINE6_FALLBACK_MAXPACKETSIZE;
 572                         dev_err(line6->ifcdev,
 573                                 "endpoint not available, using fallback values");
 574                 }
 575         }
 576
 577         ret = snd_card_new(line6->ifcdev,
 578                            SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 579                            THIS_MODULE, 0, &card);
 580         if (ret < 0)
 581                 goto err_put;
 582
 583         line6->card = card;
 584         strcpy(card->id, line6->properties->id);
 585         strcpy(card->driver, DRIVER_NAME);
 586         strcpy(card->shortname, line6->properties->name);
 587         sprintf(card->longname, "Line6 %s at USB %s", line6->properties->name,
 588                 dev_name(line6->ifcdev));
 589         card->private_data = line6;
 590         card->private_free = line6_destruct;
 591
 592         usb_set_intfdata(interface, line6);
 593
 594         /* increment reference counters: */
 595         usb_get_dev(usbdev);
 596
 597         if (properties->capabilities & LINE6_CAP_CONTROL) {
 598                 /* initialize USB buffers: */
 599                 line6->buffer_listen =
 600                     kmalloc(LINE6_BUFSIZE_LISTEN, GFP_KERNEL);
 601                 if (line6->buffer_listen == NULL) {
 602                         ret = -ENOMEM;
 603                         goto err_destruct;
 604                 }
 605
 606                 line6->buffer_message =
 607                     kmalloc(LINE6_MESSAGE_MAXLEN, GFP_KERNEL);
 608                 if (line6->buffer_message == NULL) {
 609                         ret = -ENOMEM;
 610                         goto err_destruct;
 611                 }
 612
 613                 line6->urb_listen = usb_alloc_urb(0, GFP_KERNEL);
 614
 615                 if (line6->urb_listen == NULL) {
 616                         ret = -ENOMEM;
 617                         goto err_destruct;
 618                 }
 619
 620                 ret = line6_start_listen(line6);
 621                 if (ret < 0) {
 622                         dev_err(&interface->dev, "%s: usb_submit_urb failed\n",
 623                                 __func__);
 624                         goto err_destruct;
 625                 }
 626         }
 627
 628         /* initialize device data based on device: */
 629         ret = private_init(interface, line6);
 630         if (ret < 0)
 631                 goto err_destruct;
 632
 633         /* creation of additional special files should go here */
 634
 635         dev_info(&interface->dev, "Line6 %s now attached\n",
 636                  line6->properties->name);
 637
 638         return 0;
 639
 640  err_destruct:
 641         snd_card_free(card);
 642  err_put:
 643         return ret;
 644 }
 645 EXPORT_SYMBOL_GPL(line6_probe);
 646
 647 /*
 648         Line6 device disconnected.
 649 */
 650 void line6_disconnect(struct usb_interface *interface)
 651 {
 652         struct usb_line6 *line6;
 653         struct usb_device *usbdev;
 654         int interface_number;
 655
 656         if (interface == NULL)
 657                 return;
 658         usbdev = interface_to_usbdev(interface);
 659         if (usbdev == NULL)
 660                 return;
 661
 662         interface_number = interface->cur_altsetting->desc.bInterfaceNumber;
 663         line6 = usb_get_intfdata(interface);
 664         if (!line6)
 665                 return;
 666
 667         if (line6->urb_listen != NULL)
 668                 line6_stop_listen(line6);
 669
 670         if (usbdev != line6->usbdev)
 671                 dev_err(line6->ifcdev, "driver bug: inconsistent usb device\n");
 672
 673         snd_card_disconnect(line6->card);
 674         if (line6->disconnect)
 675                 line6->disconnect(interface);
 676
 677         dev_info(&interface->dev, "Line6 %s now disconnected\n",
 678                  line6->properties->name);
 679
 680         /* make sure the device isn't destructed twice: */
 681         usb_set_intfdata(interface, NULL);
 682
 683         snd_card_free_when_closed(line6->card);
 684 }
 685 EXPORT_SYMBOL_GPL(line6_disconnect);
 686
 687 #ifdef CONFIG_PM
 688
 689 /*
 690         Suspend Line6 device.
 691 */
 692 int line6_suspend(struct usb_interface *interface, pm_message_t message)
 693 {
 694         struct usb_line6 *line6 = usb_get_intfdata(interface);
 695         struct snd_line6_pcm *line6pcm = line6->line6pcm;
 696
 697         snd_power_change_state(line6->card, SNDRV_CTL_POWER_D3hot);
 698
 699         if (line6->properties->capabilities & LINE6_CAP_CONTROL)
 700                 line6_stop_listen(line6);
 701
 702         if (line6pcm != NULL) {
 703                 snd_pcm_suspend_all(line6pcm->pcm);
 704                 line6_pcm_disconnect(line6pcm);
 705                 line6pcm->flags = 0;
 706         }
 707
 708         return 0;
 709 }
 710 EXPORT_SYMBOL_GPL(line6_suspend);
 711
 712 /*
 713         Resume Line6 device.
 714 */
 715 int line6_resume(struct usb_interface *interface)
 716 {
 717         struct usb_line6 *line6 = usb_get_intfdata(interface);
 718
 719         if (line6->properties->capabilities & LINE6_CAP_CONTROL)
 720                 line6_start_listen(line6);
 721
 722         snd_power_change_state(line6->card, SNDRV_CTL_POWER_D0);
 723         return 0;
 724 }
 725 EXPORT_SYMBOL_GPL(line6_resume);
 726
 727 #endif /* CONFIG_PM */
 728
 729 MODULE_AUTHOR(DRIVER_AUTHOR);
 730 MODULE_DESCRIPTION(DRIVER_DESC);
 731 MODULE_LICENSE("GPL");
 732 MODULE_VERSION(DRIVER_VERSION);