usb/line6/driver.c

   1 /*
   2  * Line 6 Linux USB driver
   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 #include <sound/hwdep.h>
  21
  22 #include "capture.h"
  23 #include "driver.h"
  24 #include "midi.h"
  25 #include "playback.h"
  26
  27 #define DRIVER_AUTHOR  "Markus Grabner <grabner@icg.tugraz.at>"
  28 #define DRIVER_DESC    "Line 6 USB Driver"
  29
  30 /*
  31         This is Line 6's MIDI manufacturer ID.
  32 */
  33 const unsigned char line6_midi_id[3] = {
  34         0x00, 0x01, 0x0c
  35 };
  36 EXPORT_SYMBOL_GPL(line6_midi_id);
  37
  38 /*
  39         Code to request version of POD, Variax interface
  40         (and maybe other devices).
  41 */
  42 static const char line6_request_version[] = {
  43         0xf0, 0x7e, 0x7f, 0x06, 0x01, 0xf7
  44 };
  45
  46 /*
  47          Class for asynchronous messages.
  48 */
  49 struct message {
  50         struct usb_line6 *line6;
  51         const char *buffer;
  52         int size;
  53         int done;
  54 };
  55
  56 /*
  57         Forward declarations.
  58 */
  59 static void line6_data_received(struct urb *urb);
  60 static int line6_send_raw_message_async_part(struct message *msg,
  61                                              struct urb *urb);
  62
  63 /*
  64         Start to listen on endpoint.
  65 */
  66 static int line6_start_listen(struct usb_line6 *line6)
  67 {
  68         int err;
  69
  70         if (line6->properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
  71                 usb_fill_int_urb(line6->urb_listen, line6->usbdev,
  72                         usb_rcvintpipe(line6->usbdev, line6->properties->ep_ctrl_r),
  73                         line6->buffer_listen, LINE6_BUFSIZE_LISTEN,
  74                         line6_data_received, line6, line6->interval);
  75         } else {
  76                 usb_fill_bulk_urb(line6->urb_listen, line6->usbdev,
  77                         usb_rcvbulkpipe(line6->usbdev, line6->properties->ep_ctrl_r),
  78                         line6->buffer_listen, LINE6_BUFSIZE_LISTEN,
  79                         line6_data_received, line6);
  80         }
  81
  82         /* sanity checks of EP before actually submitting */
  83         if (usb_urb_ep_type_check(line6->urb_listen)) {
  84                 dev_err(line6->ifcdev, "invalid control EP\n");
  85                 return -EINVAL;
  86         }
  87
  88         line6->urb_listen->actual_length = 0;
  89         err = usb_submit_urb(line6->urb_listen, GFP_ATOMIC);
  90         return err;
  91 }
  92
  93 /*
  94         Stop listening on endpoint.
  95 */
  96 static void line6_stop_listen(struct usb_line6 *line6)
  97 {
  98         usb_kill_urb(line6->urb_listen);
  99 }
 100
 101 /*
 102         Send raw message in pieces of wMaxPacketSize bytes.
 103 */
 104 static int line6_send_raw_message(struct usb_line6 *line6, const char *buffer,
 105                                   int size)
 106 {
 107         int i, done = 0;
 108         const struct line6_properties *properties = line6->properties;
 109
 110         for (i = 0; i < size; i += line6->max_packet_size) {
 111                 int partial;
 112                 const char *frag_buf = buffer + i;
 113                 int frag_size = min(line6->max_packet_size, size - i);
 114                 int retval;
 115
 116                 if (properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
 117                         retval = usb_interrupt_msg(line6->usbdev,
 118                                                 usb_sndintpipe(line6->usbdev, properties->ep_ctrl_w),
 119                                                 (char *)frag_buf, frag_size,
 120                                                 &partial, LINE6_TIMEOUT);
 121                 } else {
 122                         retval = usb_bulk_msg(line6->usbdev,
 123                                                 usb_sndbulkpipe(line6->usbdev, properties->ep_ctrl_w),
 124                                                 (char *)frag_buf, frag_size,
 125                                                 &partial, LINE6_TIMEOUT);
 126                 }
 127
 128                 if (retval) {
 129                         dev_err(line6->ifcdev,
 130                                 "usb_bulk_msg failed (%d)\n", retval);
 131                         break;
 132                 }
 133
 134                 done += frag_size;
 135         }
 136
 137         return done;
 138 }
 139
 140 /*
 141         Notification of completion of asynchronous request transmission.
 142 */
 143 static void line6_async_request_sent(struct urb *urb)
 144 {
 145         struct message *msg = (struct message *)urb->context;
 146
 147         if (msg->done >= msg->size) {
 148                 usb_free_urb(urb);
 149                 kfree(msg);
 150         } else
 151                 line6_send_raw_message_async_part(msg, urb);
 152 }
 153
 154 /*
 155         Asynchronously send part of a raw message.
 156 */
 157 static int line6_send_raw_message_async_part(struct message *msg,
 158                                              struct urb *urb)
 159 {
 160         int retval;
 161         struct usb_line6 *line6 = msg->line6;
 162         int done = msg->done;
 163         int bytes = min(msg->size - done, line6->max_packet_size);
 164
 165         if (line6->properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
 166                 usb_fill_int_urb(urb, line6->usbdev,
 167                         usb_sndintpipe(line6->usbdev, line6->properties->ep_ctrl_w),
 168                         (char *)msg->buffer + done, bytes,
 169                         line6_async_request_sent, msg, line6->interval);
 170         } else {
 171                 usb_fill_bulk_urb(urb, line6->usbdev,
 172                         usb_sndbulkpipe(line6->usbdev, line6->properties->ep_ctrl_w),
 173                         (char *)msg->buffer + done, bytes,
 174                         line6_async_request_sent, msg);
 175         }
 176
 177         msg->done += bytes;
 178
 179         /* sanity checks of EP before actually submitting */
 180         retval = usb_urb_ep_type_check(urb);
 181         if (retval < 0)
 182                 goto error;
 183
 184         retval = usb_submit_urb(urb, GFP_ATOMIC);
 185         if (retval < 0)
 186                 goto error;
 187
 188         return 0;
 189
 190  error:
 191         dev_err(line6->ifcdev, "%s: usb_submit_urb failed (%d)\n",
 192                 __func__, retval);
 193         usb_free_urb(urb);
 194         kfree(msg);
 195         return retval;
 196 }
 197
 198 /*
 199         Setup and start timer.
 200 */
 201 void line6_start_timer(struct timer_list *timer, unsigned long msecs,
 202                        void (*function)(struct timer_list *t))
 203 {
 204         timer->function = function;
 205         mod_timer(timer, jiffies + msecs_to_jiffies(msecs));
 206 }
 207 EXPORT_SYMBOL_GPL(line6_start_timer);
 208
 209 /*
 210         Asynchronously send raw message.
 211 */
 212 int line6_send_raw_message_async(struct usb_line6 *line6, const char *buffer,
 213                                  int size)
 214 {
 215         struct message *msg;
 216         struct urb *urb;
 217
 218         /* create message: */
 219         msg = kmalloc(sizeof(struct message), GFP_ATOMIC);
 220         if (msg == NULL)
 221                 return -ENOMEM;
 222
 223         /* create URB: */
 224         urb = usb_alloc_urb(0, GFP_ATOMIC);
 225
 226         if (urb == NULL) {
 227                 kfree(msg);
 228                 return -ENOMEM;
 229         }
 230
 231         /* set message data: */
 232         msg->line6 = line6;
 233         msg->buffer = buffer;
 234         msg->size = size;
 235         msg->done = 0;
 236
 237         /* start sending: */
 238         return line6_send_raw_message_async_part(msg, urb);
 239 }
 240 EXPORT_SYMBOL_GPL(line6_send_raw_message_async);
 241
 242 /*
 243         Send asynchronous device version request.
 244 */
 245 int line6_version_request_async(struct usb_line6 *line6)
 246 {
 247         char *buffer;
 248         int retval;
 249
 250         buffer = kmemdup(line6_request_version,
 251                         sizeof(line6_request_version), GFP_ATOMIC);
 252         if (buffer == NULL)
 253                 return -ENOMEM;
 254
 255         retval = line6_send_raw_message_async(line6, buffer,
 256                                               sizeof(line6_request_version));
 257         kfree(buffer);
 258         return retval;
 259 }
 260 EXPORT_SYMBOL_GPL(line6_version_request_async);
 261
 262 /*
 263         Send sysex message in pieces of wMaxPacketSize bytes.
 264 */
 265 int line6_send_sysex_message(struct usb_line6 *line6, const char *buffer,
 266                              int size)
 267 {
 268         return line6_send_raw_message(line6, buffer,
 269                                       size + SYSEX_EXTRA_SIZE) -
 270             SYSEX_EXTRA_SIZE;
 271 }
 272 EXPORT_SYMBOL_GPL(line6_send_sysex_message);
 273
 274 /*
 275         Allocate buffer for sysex message and prepare header.
 276         @param code sysex message code
 277         @param size number of bytes between code and sysex end
 278 */
 279 char *line6_alloc_sysex_buffer(struct usb_line6 *line6, int code1, int code2,
 280                                int size)
 281 {
 282         char *buffer = kmalloc(size + SYSEX_EXTRA_SIZE, GFP_ATOMIC);
 283
 284         if (!buffer)
 285                 return NULL;
 286
 287         buffer[0] = LINE6_SYSEX_BEGIN;
 288         memcpy(buffer + 1, line6_midi_id, sizeof(line6_midi_id));
 289         buffer[sizeof(line6_midi_id) + 1] = code1;
 290         buffer[sizeof(line6_midi_id) + 2] = code2;
 291         buffer[sizeof(line6_midi_id) + 3 + size] = LINE6_SYSEX_END;
 292         return buffer;
 293 }
 294 EXPORT_SYMBOL_GPL(line6_alloc_sysex_buffer);
 295
 296 /*
 297         Notification of data received from the Line 6 device.
 298 */
 299 static void line6_data_received(struct urb *urb)
 300 {
 301         struct usb_line6 *line6 = (struct usb_line6 *)urb->context;
 302         struct midi_buffer *mb = &line6->line6midi->midibuf_in;
 303         int done;
 304
 305         if (urb->status == -ESHUTDOWN)
 306                 return;
 307
 308         if (line6->properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
 309                 done =
 310                         line6_midibuf_write(mb, urb->transfer_buffer, urb->actual_length);
 311
 312                 if (done < urb->actual_length) {
 313                         line6_midibuf_ignore(mb, done);
 314                         dev_dbg(line6->ifcdev, "%d %d buffer overflow - message skipped\n",
 315                                 done, urb->actual_length);
 316                 }
 317
 318                 for (;;) {
 319                         done =
 320                                 line6_midibuf_read(mb, line6->buffer_message,
 321                                                 LINE6_MIDI_MESSAGE_MAXLEN);
 322
 323                         if (done <= 0)
 324                                 break;
 325
 326                         line6->message_length = done;
 327                         line6_midi_receive(line6, line6->buffer_message, done);
 328
 329                         if (line6->process_message)
 330                                 line6->process_message(line6);
 331                 }
 332         } else {
 333                 line6->buffer_message = urb->transfer_buffer;
 334                 line6->message_length = urb->actual_length;
 335                 if (line6->process_message)
 336                         line6->process_message(line6);
 337                 line6->buffer_message = NULL;
 338         }
 339
 340         line6_start_listen(line6);
 341 }
 342
 343 #define LINE6_READ_WRITE_STATUS_DELAY 2  /* milliseconds */
 344 #define LINE6_READ_WRITE_MAX_RETRIES 50
 345
 346 /*
 347         Read data from device.
 348 */
 349 int line6_read_data(struct usb_line6 *line6, unsigned address, void *data,
 350                     unsigned datalen)
 351 {
 352         struct usb_device *usbdev = line6->usbdev;
 353         int ret;
 354         unsigned char *len;
 355         unsigned count;
 356
 357         if (address > 0xffff || datalen > 0xff)
 358                 return -EINVAL;
 359
 360         len = kmalloc(sizeof(*len), GFP_KERNEL);
 361         if (!len)
 362                 return -ENOMEM;
 363
 364         /* query the serial number: */
 365         ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x67,
 366                               USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
 367                               (datalen << 8) | 0x21, address,
 368                               NULL, 0, LINE6_TIMEOUT);
 369
 370         if (ret < 0) {
 371                 dev_err(line6->ifcdev, "read request failed (error %d)\n", ret);
 372                 goto exit;
 373         }
 374
 375         /* Wait for data length. We'll get 0xff until length arrives. */
 376         for (count = 0; count < LINE6_READ_WRITE_MAX_RETRIES; count++) {
 377                 mdelay(LINE6_READ_WRITE_STATUS_DELAY);
 378
 379                 ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
 380                                       USB_TYPE_VENDOR | USB_RECIP_DEVICE |
 381                                       USB_DIR_IN,
 382                                       0x0012, 0x0000, len, 1,
 383                                       LINE6_TIMEOUT);
 384                 if (ret < 0) {
 385                         dev_err(line6->ifcdev,
 386                                 "receive length failed (error %d)\n", ret);
 387                         goto exit;
 388                 }
 389
 390                 if (*len != 0xff)
 391                         break;
 392         }
 393
 394         ret = -EIO;
 395         if (*len == 0xff) {
 396                 dev_err(line6->ifcdev, "read failed after %d retries\n",
 397                         count);
 398                 goto exit;
 399         } else if (*len != datalen) {
 400                 /* should be equal or something went wrong */
 401                 dev_err(line6->ifcdev,
 402                         "length mismatch (expected %d, got %d)\n",
 403                         (int)datalen, (int)*len);
 404                 goto exit;
 405         }
 406
 407         /* receive the result: */
 408         ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
 409                               USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 410                               0x0013, 0x0000, data, datalen,
 411                               LINE6_TIMEOUT);
 412
 413         if (ret < 0)
 414                 dev_err(line6->ifcdev, "read failed (error %d)\n", ret);
 415
 416 exit:
 417         kfree(len);
 418         return ret;
 419 }
 420 EXPORT_SYMBOL_GPL(line6_read_data);
 421
 422 /*
 423         Write data to device.
 424 */
 425 int line6_write_data(struct usb_line6 *line6, unsigned address, void *data,
 426                      unsigned datalen)
 427 {
 428         struct usb_device *usbdev = line6->usbdev;
 429         int ret;
 430         unsigned char *status;
 431         int count;
 432
 433         if (address > 0xffff || datalen > 0xffff)
 434                 return -EINVAL;
 435
 436         status = kmalloc(sizeof(*status), GFP_KERNEL);
 437         if (!status)
 438                 return -ENOMEM;
 439
 440         ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x67,
 441                               USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
 442                               0x0022, address, data, datalen,
 443                               LINE6_TIMEOUT);
 444
 445         if (ret < 0) {
 446                 dev_err(line6->ifcdev,
 447                         "write request failed (error %d)\n", ret);
 448                 goto exit;
 449         }
 450
 451         for (count = 0; count < LINE6_READ_WRITE_MAX_RETRIES; count++) {
 452                 mdelay(LINE6_READ_WRITE_STATUS_DELAY);
 453
 454                 ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
 455                                       0x67,
 456                                       USB_TYPE_VENDOR | USB_RECIP_DEVICE |
 457                                       USB_DIR_IN,
 458                                       0x0012, 0x0000,
 459                                       status, 1, LINE6_TIMEOUT);
 460
 461                 if (ret < 0) {
 462                         dev_err(line6->ifcdev,
 463                                 "receiving status failed (error %d)\n", ret);
 464                         goto exit;
 465                 }
 466
 467                 if (*status != 0xff)
 468                         break;
 469         }
 470
 471         if (*status == 0xff) {
 472                 dev_err(line6->ifcdev, "write failed after %d retries\n",
 473                         count);
 474                 ret = -EIO;
 475         } else if (*status != 0) {
 476                 dev_err(line6->ifcdev, "write failed (error %d)\n", ret);
 477                 ret = -EIO;
 478         }
 479 exit:
 480         kfree(status);
 481         return ret;
 482 }
 483 EXPORT_SYMBOL_GPL(line6_write_data);
 484
 485 /*
 486         Read Line 6 device serial number.
 487         (POD, TonePort, GuitarPort)
 488 */
 489 int line6_read_serial_number(struct usb_line6 *line6, u32 *serial_number)
 490 {
 491         return line6_read_data(line6, 0x80d0, serial_number,
 492                                sizeof(*serial_number));
 493 }
 494 EXPORT_SYMBOL_GPL(line6_read_serial_number);
 495
 496 /*
 497         Card destructor.
 498 */
 499 static void line6_destruct(struct snd_card *card)
 500 {
 501         struct usb_line6 *line6 = card->private_data;
 502         struct usb_device *usbdev = line6->usbdev;
 503
 504         /* Free buffer memory first. We cannot depend on the existence of private
 505          * data from the (podhd) module, it may be gone already during this call
 506          */
 507         kfree(line6->buffer_message);
 508
 509         kfree(line6->buffer_listen);
 510
 511         /* then free URBs: */
 512         usb_free_urb(line6->urb_listen);
 513         line6->urb_listen = NULL;
 514
 515         /* decrement reference counters: */
 516         usb_put_dev(usbdev);
 517 }
 518
 519 static void line6_get_usb_properties(struct usb_line6 *line6)
 520 {
 521         struct usb_device *usbdev = line6->usbdev;
 522         const struct line6_properties *properties = line6->properties;
 523         int pipe;
 524         struct usb_host_endpoint *ep = NULL;
 525
 526         if (properties->capabilities & LINE6_CAP_CONTROL) {
 527                 if (properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
 528                         pipe = usb_rcvintpipe(line6->usbdev,
 529                                 line6->properties->ep_ctrl_r);
 530                 } else {
 531                         pipe = usb_rcvbulkpipe(line6->usbdev,
 532                                 line6->properties->ep_ctrl_r);
 533                 }
 534                 ep = usbdev->ep_in[usb_pipeendpoint(pipe)];
 535         }
 536
 537         /* Control data transfer properties */
 538         if (ep) {
 539                 line6->interval = ep->desc.bInterval;
 540                 line6->max_packet_size = le16_to_cpu(ep->desc.wMaxPacketSize);
 541         } else {
 542                 if (properties->capabilities & LINE6_CAP_CONTROL) {
 543                         dev_err(line6->ifcdev,
 544                                 "endpoint not available, using fallback values");
 545                 }
 546                 line6->interval = LINE6_FALLBACK_INTERVAL;
 547                 line6->max_packet_size = LINE6_FALLBACK_MAXPACKETSIZE;
 548         }
 549
 550         /* Isochronous transfer properties */
 551         if (usbdev->speed == USB_SPEED_LOW) {
 552                 line6->intervals_per_second = USB_LOW_INTERVALS_PER_SECOND;
 553                 line6->iso_buffers = USB_LOW_ISO_BUFFERS;
 554         } else {
 555                 line6->intervals_per_second = USB_HIGH_INTERVALS_PER_SECOND;
 556                 line6->iso_buffers = USB_HIGH_ISO_BUFFERS;
 557         }
 558 }
 559
 560 /* Enable buffering of incoming messages, flush the buffer */
 561 static int line6_hwdep_open(struct snd_hwdep *hw, struct file *file)
 562 {
 563         struct usb_line6 *line6 = hw->private_data;
 564
 565         /* NOTE: hwdep layer provides atomicity here */
 566
 567         line6->messages.active = 1;
 568
 569         return 0;
 570 }
 571
 572 /* Stop buffering */
 573 static int line6_hwdep_release(struct snd_hwdep *hw, struct file *file)
 574 {
 575         struct usb_line6 *line6 = hw->private_data;
 576
 577         line6->messages.active = 0;
 578
 579         return 0;
 580 }
 581
 582 /* Read from circular buffer, return to user */
 583 static long
 584 line6_hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
 585                                         loff_t *offset)
 586 {
 587         struct usb_line6 *line6 = hwdep->private_data;
 588         long rv = 0;
 589         unsigned int out_count;
 590
 591         if (mutex_lock_interruptible(&line6->messages.read_lock))
 592                 return -ERESTARTSYS;
 593
 594         while (kfifo_len(&line6->messages.fifo) == 0) {
 595                 mutex_unlock(&line6->messages.read_lock);
 596
 597                 rv = wait_event_interruptible(
 598                         line6->messages.wait_queue,
 599                         kfifo_len(&line6->messages.fifo) != 0);
 600                 if (rv < 0)
 601                         return rv;
 602
 603                 if (mutex_lock_interruptible(&line6->messages.read_lock))
 604                         return -ERESTARTSYS;
 605         }
 606
 607         if (kfifo_peek_len(&line6->messages.fifo) > count) {
 608                 /* Buffer too small; allow re-read of the current item... */
 609                 rv = -EINVAL;
 610         } else {
 611                 rv = kfifo_to_user(&line6->messages.fifo, buf, count, &out_count);
 612                 if (rv == 0)
 613                         rv = out_count;
 614         }
 615
 616         mutex_unlock(&line6->messages.read_lock);
 617         return rv;
 618 }
 619
 620 /* Write directly (no buffering) to device by user*/
 621 static long
 622 line6_hwdep_write(struct snd_hwdep *hwdep, const char __user *data, long count,
 623                                         loff_t *offset)
 624 {
 625         struct usb_line6 *line6 = hwdep->private_data;
 626         int rv;
 627         char *data_copy;
 628
 629         if (count > line6->max_packet_size * LINE6_RAW_MESSAGES_MAXCOUNT) {
 630                 /* This is an arbitrary limit - still better than nothing... */
 631                 return -EINVAL;
 632         }
 633
 634         data_copy = memdup_user(data, count);
 635         if (IS_ERR(data_copy))
 636                 return PTR_ERR(data_copy);
 637
 638         rv = line6_send_raw_message(line6, data_copy, count);
 639
 640         kfree(data_copy);
 641         return rv;
 642 }
 643
 644 static const struct snd_hwdep_ops hwdep_ops = {
 645         .open    = line6_hwdep_open,
 646         .release = line6_hwdep_release,
 647         .read    = line6_hwdep_read,
 648         .write   = line6_hwdep_write,
 649 };
 650
 651 /* Insert into circular buffer */
 652 static void line6_hwdep_push_message(struct usb_line6 *line6)
 653 {
 654         if (!line6->messages.active)
 655                 return;
 656
 657         if (kfifo_avail(&line6->messages.fifo) >= line6->message_length) {
 658                 /* No race condition here, there's only one writer */
 659                 kfifo_in(&line6->messages.fifo,
 660                         line6->buffer_message, line6->message_length);
 661         } /* else TODO: signal overflow */
 662
 663         wake_up_interruptible(&line6->messages.wait_queue);
 664 }
 665
 666 static int line6_hwdep_init(struct usb_line6 *line6)
 667 {
 668         int err;
 669         struct snd_hwdep *hwdep;
 670
 671         /* TODO: usb_driver_claim_interface(); */
 672         line6->process_message = line6_hwdep_push_message;
 673         line6->messages.active = 0;
 674         init_waitqueue_head(&line6->messages.wait_queue);
 675         mutex_init(&line6->messages.read_lock);
 676         INIT_KFIFO(line6->messages.fifo);
 677
 678         err = snd_hwdep_new(line6->card, "config", 0, &hwdep);
 679         if (err < 0)
 680                 goto end;
 681         strcpy(hwdep->name, "config");
 682         hwdep->iface = SNDRV_HWDEP_IFACE_LINE6;
 683         hwdep->ops = hwdep_ops;
 684         hwdep->private_data = line6;
 685         hwdep->exclusive = true;
 686
 687 end:
 688         return err;
 689 }
 690
 691 static int line6_init_cap_control(struct usb_line6 *line6)
 692 {
 693         int ret;
 694
 695         /* initialize USB buffers: */
 696         line6->buffer_listen = kmalloc(LINE6_BUFSIZE_LISTEN, GFP_KERNEL);
 697         if (!line6->buffer_listen)
 698                 return -ENOMEM;
 699
 700         line6->urb_listen = usb_alloc_urb(0, GFP_KERNEL);
 701         if (!line6->urb_listen)
 702                 return -ENOMEM;
 703
 704         if (line6->properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
 705                 line6->buffer_message = kmalloc(LINE6_MIDI_MESSAGE_MAXLEN, GFP_KERNEL);
 706                 if (!line6->buffer_message)
 707                         return -ENOMEM;
 708
 709                 ret = line6_init_midi(line6);
 710                 if (ret < 0)
 711                         return ret;
 712         } else {
 713                 ret = line6_hwdep_init(line6);
 714                 if (ret < 0)
 715                         return ret;
 716         }
 717
 718         ret = line6_start_listen(line6);
 719         if (ret < 0) {
 720                 dev_err(line6->ifcdev, "cannot start listening: %d\n", ret);
 721                 return ret;
 722         }
 723
 724         return 0;
 725 }
 726
 727 static void line6_startup_work(struct work_struct *work)
 728 {
 729         struct usb_line6 *line6 =
 730                 container_of(work, struct usb_line6, startup_work.work);
 731
 732         if (line6->startup)
 733                 line6->startup(line6);
 734 }
 735
 736 /*
 737         Probe USB device.
 738 */
 739 int line6_probe(struct usb_interface *interface,
 740                 const struct usb_device_id *id,
 741                 const char *driver_name,
 742                 const struct line6_properties *properties,
 743                 int (*private_init)(struct usb_line6 *, const struct usb_device_id *id),
 744                 size_t data_size)
 745 {
 746         struct usb_device *usbdev = interface_to_usbdev(interface);
 747         struct snd_card *card;
 748         struct usb_line6 *line6;
 749         int interface_number;
 750         int ret;
 751
 752         if (WARN_ON(data_size < sizeof(*line6)))
 753                 return -EINVAL;
 754
 755         /* we don't handle multiple configurations */
 756         if (usbdev->descriptor.bNumConfigurations != 1)
 757                 return -ENODEV;
 758
 759         ret = snd_card_new(&interface->dev,
 760                            SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 761                            THIS_MODULE, data_size, &card);
 762         if (ret < 0)
 763                 return ret;
 764
 765         /* store basic data: */
 766         line6 = card->private_data;
 767         line6->card = card;
 768         line6->properties = properties;
 769         line6->usbdev = usbdev;
 770         line6->ifcdev = &interface->dev;
 771         INIT_DELAYED_WORK(&line6->startup_work, line6_startup_work);
 772
 773         strcpy(card->id, properties->id);
 774         strcpy(card->driver, driver_name);
 775         strcpy(card->shortname, properties->name);
 776         sprintf(card->longname, "Line 6 %s at USB %s", properties->name,
 777                 dev_name(line6->ifcdev));
 778         card->private_free = line6_destruct;
 779
 780         usb_set_intfdata(interface, line6);
 781
 782         /* increment reference counters: */
 783         usb_get_dev(usbdev);
 784
 785         /* initialize device info: */
 786         dev_info(&interface->dev, "Line 6 %s found\n", properties->name);
 787
 788         /* query interface number */
 789         interface_number = interface->cur_altsetting->desc.bInterfaceNumber;
 790
 791         /* TODO reserves the bus bandwidth even without actual transfer */
 792         ret = usb_set_interface(usbdev, interface_number,
 793                                 properties->altsetting);
 794         if (ret < 0) {
 795                 dev_err(&interface->dev, "set_interface failed\n");
 796                 goto error;
 797         }
 798
 799         line6_get_usb_properties(line6);
 800
 801         if (properties->capabilities & LINE6_CAP_CONTROL) {
 802                 ret = line6_init_cap_control(line6);
 803                 if (ret < 0)
 804                         goto error;
 805         }
 806
 807         /* initialize device data based on device: */
 808         ret = private_init(line6, id);
 809         if (ret < 0)
 810                 goto error;
 811
 812         /* creation of additional special files should go here */
 813
 814         dev_info(&interface->dev, "Line 6 %s now attached\n",
 815                  properties->name);
 816
 817         return 0;
 818
 819  error:
 820         /* we can call disconnect callback here because no close-sync is
 821          * needed yet at this point
 822          */
 823         line6_disconnect(interface);
 824         return ret;
 825 }
 826 EXPORT_SYMBOL_GPL(line6_probe);
 827
 828 /*
 829         Line 6 device disconnected.
 830 */
 831 void line6_disconnect(struct usb_interface *interface)
 832 {
 833         struct usb_line6 *line6 = usb_get_intfdata(interface);
 834         struct usb_device *usbdev = interface_to_usbdev(interface);
 835
 836         if (!line6)
 837                 return;
 838
 839         if (WARN_ON(usbdev != line6->usbdev))
 840                 return;
 841
 842         cancel_delayed_work_sync(&line6->startup_work);
 843
 844         if (line6->urb_listen != NULL)
 845                 line6_stop_listen(line6);
 846
 847         snd_card_disconnect(line6->card);
 848         if (line6->line6pcm)
 849                 line6_pcm_disconnect(line6->line6pcm);
 850         if (line6->disconnect)
 851                 line6->disconnect(line6);
 852
 853         dev_info(&interface->dev, "Line 6 %s now disconnected\n",
 854                  line6->properties->name);
 855
 856         /* make sure the device isn't destructed twice: */
 857         usb_set_intfdata(interface, NULL);
 858
 859         snd_card_free_when_closed(line6->card);
 860 }
 861 EXPORT_SYMBOL_GPL(line6_disconnect);
 862
 863 #ifdef CONFIG_PM
 864
 865 /*
 866         Suspend Line 6 device.
 867 */
 868 int line6_suspend(struct usb_interface *interface, pm_message_t message)
 869 {
 870         struct usb_line6 *line6 = usb_get_intfdata(interface);
 871         struct snd_line6_pcm *line6pcm = line6->line6pcm;
 872
 873         snd_power_change_state(line6->card, SNDRV_CTL_POWER_D3hot);
 874
 875         if (line6->properties->capabilities & LINE6_CAP_CONTROL)
 876                 line6_stop_listen(line6);
 877
 878         if (line6pcm != NULL) {
 879                 snd_pcm_suspend_all(line6pcm->pcm);
 880                 line6pcm->flags = 0;
 881         }
 882
 883         return 0;
 884 }
 885 EXPORT_SYMBOL_GPL(line6_suspend);
 886
 887 /*
 888         Resume Line 6 device.
 889 */
 890 int line6_resume(struct usb_interface *interface)
 891 {
 892         struct usb_line6 *line6 = usb_get_intfdata(interface);
 893
 894         if (line6->properties->capabilities & LINE6_CAP_CONTROL)
 895                 line6_start_listen(line6);
 896
 897         snd_power_change_state(line6->card, SNDRV_CTL_POWER_D0);
 898         return 0;
 899 }
 900 EXPORT_SYMBOL_GPL(line6_resume);
 901
 902 #endif /* CONFIG_PM */
 903
 904 MODULE_AUTHOR(DRIVER_AUTHOR);
 905 MODULE_DESCRIPTION(DRIVER_DESC);
 906 MODULE_LICENSE("GPL");
 907