sound/usb/midi.c

   1 /*
   2  * usbmidi.c - ALSA USB MIDI driver
   3  *
   4  * Copyright (c) 2002-2009 Clemens Ladisch
   5  * All rights reserved.
   6  *
   7  * Based on the OSS usb-midi driver by NAGANO Daisuke,
   8  *          NetBSD's umidi driver by Takuya SHIOZAKI,
   9  *          the "USB Device Class Definition for MIDI Devices" by Roland
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. The name of the author may not be used to endorse or promote products
  18  *    derived from this software without specific prior written permission.
  19  *
  20  * Alternatively, this software may be distributed and/or modified under the
  21  * terms of the GNU General Public License as published by the Free Software
  22  * Foundation; either version 2 of the License, or (at your option) any later
  23  * version.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  29  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  */
  37
  38 #include <linux/kernel.h>
  39 #include <linux/types.h>
  40 #include <linux/bitops.h>
  41 #include <linux/interrupt.h>
  42 #include <linux/spinlock.h>
  43 #include <linux/string.h>
  44 #include <linux/init.h>
  45 #include <linux/slab.h>
  46 #include <linux/timer.h>
  47 #include <linux/usb.h>
  48 #include <linux/wait.h>
  49 #include <linux/usb/audio.h>
  50 #include <linux/module.h>
  51
  52 #include <sound/core.h>
  53 #include <sound/control.h>
  54 #include <sound/rawmidi.h>
  55 #include <sound/asequencer.h>
  56 #include "usbaudio.h"
  57 #include "midi.h"
  58 #include "power.h"
  59 #include "helper.h"
  60
  61 /*
  62  * define this to log all USB packets
  63  */
  64 /* #define DUMP_PACKETS */
  65
  66 /*
  67  * how long to wait after some USB errors, so that khubd can disconnect() us
  68  * without too many spurious errors
  69  */
  70 #define ERROR_DELAY_JIFFIES (HZ / 10)
  71
  72 #define OUTPUT_URBS 7
  73 #define INPUT_URBS 7
  74
  75
  76 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
  77 MODULE_DESCRIPTION("USB Audio/MIDI helper module");
  78 MODULE_LICENSE("Dual BSD/GPL");
  79
  80
  81 struct usb_ms_header_descriptor {
  82         __u8  bLength;
  83         __u8  bDescriptorType;
  84         __u8  bDescriptorSubtype;
  85         __u8  bcdMSC[2];
  86         __le16 wTotalLength;
  87 } __attribute__ ((packed));
  88
  89 struct usb_ms_endpoint_descriptor {
  90         __u8  bLength;
  91         __u8  bDescriptorType;
  92         __u8  bDescriptorSubtype;
  93         __u8  bNumEmbMIDIJack;
  94         __u8  baAssocJackID[0];
  95 } __attribute__ ((packed));
  96
  97 struct snd_usb_midi_in_endpoint;
  98 struct snd_usb_midi_out_endpoint;
  99 struct snd_usb_midi_endpoint;
 100
 101 struct usb_protocol_ops {
 102         void (*input)(struct snd_usb_midi_in_endpoint*, uint8_t*, int);
 103         void (*output)(struct snd_usb_midi_out_endpoint *ep, struct urb *urb);
 104         void (*output_packet)(struct urb*, uint8_t, uint8_t, uint8_t, uint8_t);
 105         void (*init_out_endpoint)(struct snd_usb_midi_out_endpoint*);
 106         void (*finish_out_endpoint)(struct snd_usb_midi_out_endpoint*);
 107 };
 108
 109 struct snd_usb_midi {
 110         struct usb_device *dev;
 111         struct snd_card *card;
 112         struct usb_interface *iface;
 113         const struct snd_usb_audio_quirk *quirk;
 114         struct snd_rawmidi *rmidi;
 115         struct usb_protocol_ops* usb_protocol_ops;
 116         struct list_head list;
 117         struct timer_list error_timer;
 118         spinlock_t disc_lock;
 119         struct mutex mutex;
 120         u32 usb_id;
 121         int next_midi_device;
 122
 123         struct snd_usb_midi_endpoint {
 124                 struct snd_usb_midi_out_endpoint *out;
 125                 struct snd_usb_midi_in_endpoint *in;
 126         } endpoints[MIDI_MAX_ENDPOINTS];
 127         unsigned long input_triggered;
 128         unsigned int opened;
 129         unsigned char disconnected;
 130
 131         struct snd_kcontrol *roland_load_ctl;
 132 };
 133
 134 struct snd_usb_midi_out_endpoint {
 135         struct snd_usb_midi* umidi;
 136         struct out_urb_context {
 137                 struct urb *urb;
 138                 struct snd_usb_midi_out_endpoint *ep;
 139         } urbs[OUTPUT_URBS];
 140         unsigned int active_urbs;
 141         unsigned int drain_urbs;
 142         int max_transfer;               /* size of urb buffer */
 143         struct tasklet_struct tasklet;
 144         unsigned int next_urb;
 145         spinlock_t buffer_lock;
 146
 147         struct usbmidi_out_port {
 148                 struct snd_usb_midi_out_endpoint* ep;
 149                 struct snd_rawmidi_substream *substream;
 150                 int active;
 151                 uint8_t cable;          /* cable number << 4 */
 152                 uint8_t state;
 153 #define STATE_UNKNOWN   0
 154 #define STATE_1PARAM    1
 155 #define STATE_2PARAM_1  2
 156 #define STATE_2PARAM_2  3
 157 #define STATE_SYSEX_0   4
 158 #define STATE_SYSEX_1   5
 159 #define STATE_SYSEX_2   6
 160                 uint8_t data[2];
 161         } ports[0x10];
 162         int current_port;
 163
 164         wait_queue_head_t drain_wait;
 165 };
 166
 167 struct snd_usb_midi_in_endpoint {
 168         struct snd_usb_midi* umidi;
 169         struct urb* urbs[INPUT_URBS];
 170         struct usbmidi_in_port {
 171                 struct snd_rawmidi_substream *substream;
 172                 u8 running_status_length;
 173         } ports[0x10];
 174         u8 seen_f5;
 175         u8 error_resubmit;
 176         int current_port;
 177 };
 178
 179 static void snd_usbmidi_do_output(struct snd_usb_midi_out_endpoint* ep);
 180
 181 static const uint8_t snd_usbmidi_cin_length[] = {
 182         0, 0, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 2, 2, 3, 1
 183 };
 184
 185 /*
 186  * Submits the URB, with error handling.
 187  */
 188 static int snd_usbmidi_submit_urb(struct urb* urb, gfp_t flags)
 189 {
 190         int err = usb_submit_urb(urb, flags);
 191         if (err < 0 && err != -ENODEV)
 192                 snd_printk(KERN_ERR "usb_submit_urb: %d\n", err);
 193         return err;
 194 }
 195
 196 /*
 197  * Error handling for URB completion functions.
 198  */
 199 static int snd_usbmidi_urb_error(int status)
 200 {
 201         switch (status) {
 202         /* manually unlinked, or device gone */
 203         case -ENOENT:
 204         case -ECONNRESET:
 205         case -ESHUTDOWN:
 206         case -ENODEV:
 207                 return -ENODEV;
 208         /* errors that might occur during unplugging */
 209         case -EPROTO:
 210         case -ETIME:
 211         case -EILSEQ:
 212                 return -EIO;
 213         default:
 214                 snd_printk(KERN_ERR "urb status %d\n", status);
 215                 return 0; /* continue */
 216         }
 217 }
 218
 219 /*
 220  * Receives a chunk of MIDI data.
 221  */
 222 static void snd_usbmidi_input_data(struct snd_usb_midi_in_endpoint* ep, int portidx,
 223                                    uint8_t* data, int length)
 224 {
 225         struct usbmidi_in_port* port = &ep->ports[portidx];
 226
 227         if (!port->substream) {
 228                 snd_printd("unexpected port %d!\n", portidx);
 229                 return;
 230         }
 231         if (!test_bit(port->substream->number, &ep->umidi->input_triggered))
 232                 return;
 233         snd_rawmidi_receive(port->substream, data, length);
 234 }
 235
 236 #ifdef DUMP_PACKETS
 237 static void dump_urb(const char *type, const u8 *data, int length)
 238 {
 239         snd_printk(KERN_DEBUG "%s packet: [", type);
 240         for (; length > 0; ++data, --length)
 241                 printk(" %02x", *data);
 242         printk(" ]\n");
 243 }
 244 #else
 245 #define dump_urb(type, data, length) /* nothing */
 246 #endif
 247
 248 /*
 249  * Processes the data read from the device.
 250  */
 251 static void snd_usbmidi_in_urb_complete(struct urb* urb)
 252 {
 253         struct snd_usb_midi_in_endpoint* ep = urb->context;
 254
 255         if (urb->status == 0) {
 256                 dump_urb("received", urb->transfer_buffer, urb->actual_length);
 257                 ep->umidi->usb_protocol_ops->input(ep, urb->transfer_buffer,
 258                                                    urb->actual_length);
 259         } else {
 260                 int err = snd_usbmidi_urb_error(urb->status);
 261                 if (err < 0) {
 262                         if (err != -ENODEV) {
 263                                 ep->error_resubmit = 1;
 264                                 mod_timer(&ep->umidi->error_timer,
 265                                           jiffies + ERROR_DELAY_JIFFIES);
 266                         }
 267                         return;
 268                 }
 269         }
 270
 271         urb->dev = ep->umidi->dev;
 272         snd_usbmidi_submit_urb(urb, GFP_ATOMIC);
 273 }
 274
 275 static void snd_usbmidi_out_urb_complete(struct urb* urb)
 276 {
 277         struct out_urb_context *context = urb->context;
 278         struct snd_usb_midi_out_endpoint* ep = context->ep;
 279         unsigned int urb_index;
 280
 281         spin_lock(&ep->buffer_lock);
 282         urb_index = context - ep->urbs;
 283         ep->active_urbs &= ~(1 << urb_index);
 284         if (unlikely(ep->drain_urbs)) {
 285                 ep->drain_urbs &= ~(1 << urb_index);
 286                 wake_up(&ep->drain_wait);
 287         }
 288         spin_unlock(&ep->buffer_lock);
 289         if (urb->status < 0) {
 290                 int err = snd_usbmidi_urb_error(urb->status);
 291                 if (err < 0) {
 292                         if (err != -ENODEV)
 293                                 mod_timer(&ep->umidi->error_timer,
 294                                           jiffies + ERROR_DELAY_JIFFIES);
 295                         return;
 296                 }
 297         }
 298         snd_usbmidi_do_output(ep);
 299 }
 300
 301 /*
 302  * This is called when some data should be transferred to the device
 303  * (from one or more substreams).
 304  */
 305 static void snd_usbmidi_do_output(struct snd_usb_midi_out_endpoint* ep)
 306 {
 307         unsigned int urb_index;
 308         struct urb* urb;
 309         unsigned long flags;
 310
 311         spin_lock_irqsave(&ep->buffer_lock, flags);
 312         if (ep->umidi->disconnected) {
 313                 spin_unlock_irqrestore(&ep->buffer_lock, flags);
 314                 return;
 315         }
 316
 317         urb_index = ep->next_urb;
 318         for (;;) {
 319                 if (!(ep->active_urbs & (1 << urb_index))) {
 320                         urb = ep->urbs[urb_index].urb;
 321                         urb->transfer_buffer_length = 0;
 322                         ep->umidi->usb_protocol_ops->output(ep, urb);
 323                         if (urb->transfer_buffer_length == 0)
 324                                 break;
 325
 326                         dump_urb("sending", urb->transfer_buffer,
 327                                  urb->transfer_buffer_length);
 328                         urb->dev = ep->umidi->dev;
 329                         if (snd_usbmidi_submit_urb(urb, GFP_ATOMIC) < 0)
 330                                 break;
 331                         ep->active_urbs |= 1 << urb_index;
 332                 }
 333                 if (++urb_index >= OUTPUT_URBS)
 334                         urb_index = 0;
 335                 if (urb_index == ep->next_urb)
 336                         break;
 337         }
 338         ep->next_urb = urb_index;
 339         spin_unlock_irqrestore(&ep->buffer_lock, flags);
 340 }
 341
 342 static void snd_usbmidi_out_tasklet(unsigned long data)
 343 {
 344         struct snd_usb_midi_out_endpoint* ep = (struct snd_usb_midi_out_endpoint *) data;
 345
 346         snd_usbmidi_do_output(ep);
 347 }
 348
 349 /* called after transfers had been interrupted due to some USB error */
 350 static void snd_usbmidi_error_timer(unsigned long data)
 351 {
 352         struct snd_usb_midi *umidi = (struct snd_usb_midi *)data;
 353         unsigned int i, j;
 354
 355         spin_lock(&umidi->disc_lock);
 356         if (umidi->disconnected) {
 357                 spin_unlock(&umidi->disc_lock);
 358                 return;
 359         }
 360         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
 361                 struct snd_usb_midi_in_endpoint *in = umidi->endpoints[i].in;
 362                 if (in && in->error_resubmit) {
 363                         in->error_resubmit = 0;
 364                         for (j = 0; j < INPUT_URBS; ++j) {
 365                                 in->urbs[j]->dev = umidi->dev;
 366                                 snd_usbmidi_submit_urb(in->urbs[j], GFP_ATOMIC);
 367                         }
 368                 }
 369                 if (umidi->endpoints[i].out)
 370                         snd_usbmidi_do_output(umidi->endpoints[i].out);
 371         }
 372         spin_unlock(&umidi->disc_lock);
 373 }
 374
 375 /* helper function to send static data that may not DMA-able */
 376 static int send_bulk_static_data(struct snd_usb_midi_out_endpoint* ep,
 377                                  const void *data, int len)
 378 {
 379         int err = 0;
 380         void *buf = kmemdup(data, len, GFP_KERNEL);
 381         if (!buf)
 382                 return -ENOMEM;
 383         dump_urb("sending", buf, len);
 384         if (ep->urbs[0].urb)
 385                 err = usb_bulk_msg(ep->umidi->dev, ep->urbs[0].urb->pipe,
 386                                    buf, len, NULL, 250);
 387         kfree(buf);
 388         return err;
 389 }
 390
 391 /*
 392  * Standard USB MIDI protocol: see the spec.
 393  * Midiman protocol: like the standard protocol, but the control byte is the
 394  * fourth byte in each packet, and uses length instead of CIN.
 395  */
 396
 397 static void snd_usbmidi_standard_input(struct snd_usb_midi_in_endpoint* ep,
 398                                        uint8_t* buffer, int buffer_length)
 399 {
 400         int i;
 401
 402         for (i = 0; i + 3 < buffer_length; i += 4)
 403                 if (buffer[i] != 0) {
 404                         int cable = buffer[i] >> 4;
 405                         int length = snd_usbmidi_cin_length[buffer[i] & 0x0f];
 406                         snd_usbmidi_input_data(ep, cable, &buffer[i + 1], length);
 407                 }
 408 }
 409
 410 static void snd_usbmidi_midiman_input(struct snd_usb_midi_in_endpoint* ep,
 411                                       uint8_t* buffer, int buffer_length)
 412 {
 413         int i;
 414
 415         for (i = 0; i + 3 < buffer_length; i += 4)
 416                 if (buffer[i + 3] != 0) {
 417                         int port = buffer[i + 3] >> 4;
 418                         int length = buffer[i + 3] & 3;
 419                         snd_usbmidi_input_data(ep, port, &buffer[i], length);
 420                 }
 421 }
 422
 423 /*
 424  * Buggy M-Audio device: running status on input results in a packet that has
 425  * the data bytes but not the status byte and that is marked with CIN 4.
 426  */
 427 static void snd_usbmidi_maudio_broken_running_status_input(
 428                                         struct snd_usb_midi_in_endpoint* ep,
 429                                         uint8_t* buffer, int buffer_length)
 430 {
 431         int i;
 432
 433         for (i = 0; i + 3 < buffer_length; i += 4)
 434                 if (buffer[i] != 0) {
 435                         int cable = buffer[i] >> 4;
 436                         u8 cin = buffer[i] & 0x0f;
 437                         struct usbmidi_in_port *port = &ep->ports[cable];
 438                         int length;
 439
 440                         length = snd_usbmidi_cin_length[cin];
 441                         if (cin == 0xf && buffer[i + 1] >= 0xf8)
 442                                 ; /* realtime msg: no running status change */
 443                         else if (cin >= 0x8 && cin <= 0xe)
 444                                 /* channel msg */
 445                                 port->running_status_length = length - 1;
 446                         else if (cin == 0x4 &&
 447                                  port->running_status_length != 0 &&
 448                                  buffer[i + 1] < 0x80)
 449                                 /* CIN 4 that is not a SysEx */
 450                                 length = port->running_status_length;
 451                         else
 452                                 /*
 453                                  * All other msgs cannot begin running status.
 454                                  * (A channel msg sent as two or three CIN 0xF
 455                                  * packets could in theory, but this device
 456                                  * doesn't use this format.)
 457                                  */
 458                                 port->running_status_length = 0;
 459                         snd_usbmidi_input_data(ep, cable, &buffer[i + 1], length);
 460                 }
 461 }
 462
 463 /*
 464  * CME protocol: like the standard protocol, but SysEx commands are sent as a
 465  * single USB packet preceded by a 0x0F byte.
 466  */
 467 static void snd_usbmidi_cme_input(struct snd_usb_midi_in_endpoint *ep,
 468                                   uint8_t *buffer, int buffer_length)
 469 {
 470         if (buffer_length < 2 || (buffer[0] & 0x0f) != 0x0f)
 471                 snd_usbmidi_standard_input(ep, buffer, buffer_length);
 472         else
 473                 snd_usbmidi_input_data(ep, buffer[0] >> 4,
 474                                        &buffer[1], buffer_length - 1);
 475 }
 476
 477 /*
 478  * Adds one USB MIDI packet to the output buffer.
 479  */
 480 static void snd_usbmidi_output_standard_packet(struct urb* urb, uint8_t p0,
 481                                                uint8_t p1, uint8_t p2, uint8_t p3)
 482 {
 483
 484         uint8_t* buf = (uint8_t*)urb->transfer_buffer + urb->transfer_buffer_length;
 485         buf[0] = p0;
 486         buf[1] = p1;
 487         buf[2] = p2;
 488         buf[3] = p3;
 489         urb->transfer_buffer_length += 4;
 490 }
 491
 492 /*
 493  * Adds one Midiman packet to the output buffer.
 494  */
 495 static void snd_usbmidi_output_midiman_packet(struct urb* urb, uint8_t p0,
 496                                               uint8_t p1, uint8_t p2, uint8_t p3)
 497 {
 498
 499         uint8_t* buf = (uint8_t*)urb->transfer_buffer + urb->transfer_buffer_length;
 500         buf[0] = p1;
 501         buf[1] = p2;
 502         buf[2] = p3;
 503         buf[3] = (p0 & 0xf0) | snd_usbmidi_cin_length[p0 & 0x0f];
 504         urb->transfer_buffer_length += 4;
 505 }
 506
 507 /*
 508  * Converts MIDI commands to USB MIDI packets.
 509  */
 510 static void snd_usbmidi_transmit_byte(struct usbmidi_out_port* port,
 511                                       uint8_t b, struct urb* urb)
 512 {
 513         uint8_t p0 = port->cable;
 514         void (*output_packet)(struct urb*, uint8_t, uint8_t, uint8_t, uint8_t) =
 515                 port->ep->umidi->usb_protocol_ops->output_packet;
 516
 517         if (b >= 0xf8) {
 518                 output_packet(urb, p0 | 0x0f, b, 0, 0);
 519         } else if (b >= 0xf0) {
 520                 switch (b) {
 521                 case 0xf0:
 522                         port->data[0] = b;
 523                         port->state = STATE_SYSEX_1;
 524                         break;
 525                 case 0xf1:
 526                 case 0xf3:
 527                         port->data[0] = b;
 528                         port->state = STATE_1PARAM;
 529                         break;
 530                 case 0xf2:
 531                         port->data[0] = b;
 532                         port->state = STATE_2PARAM_1;
 533                         break;
 534                 case 0xf4:
 535                 case 0xf5:
 536                         port->state = STATE_UNKNOWN;
 537                         break;
 538                 case 0xf6:
 539                         output_packet(urb, p0 | 0x05, 0xf6, 0, 0);
 540                         port->state = STATE_UNKNOWN;
 541                         break;
 542                 case 0xf7:
 543                         switch (port->state) {
 544                         case STATE_SYSEX_0:
 545                                 output_packet(urb, p0 | 0x05, 0xf7, 0, 0);
 546                                 break;
 547                         case STATE_SYSEX_1:
 548                                 output_packet(urb, p0 | 0x06, port->data[0], 0xf7, 0);
 549                                 break;
 550                         case STATE_SYSEX_2:
 551                                 output_packet(urb, p0 | 0x07, port->data[0], port->data[1], 0xf7);
 552                                 break;
 553                         }
 554                         port->state = STATE_UNKNOWN;
 555                         break;
 556                 }
 557         } else if (b >= 0x80) {
 558                 port->data[0] = b;
 559                 if (b >= 0xc0 && b <= 0xdf)
 560                         port->state = STATE_1PARAM;
 561                 else
 562                         port->state = STATE_2PARAM_1;
 563         } else { /* b < 0x80 */
 564                 switch (port->state) {
 565                 case STATE_1PARAM:
 566                         if (port->data[0] < 0xf0) {
 567                                 p0 |= port->data[0] >> 4;
 568                         } else {
 569                                 p0 |= 0x02;
 570                                 port->state = STATE_UNKNOWN;
 571                         }
 572                         output_packet(urb, p0, port->data[0], b, 0);
 573                         break;
 574                 case STATE_2PARAM_1:
 575                         port->data[1] = b;
 576                         port->state = STATE_2PARAM_2;
 577                         break;
 578                 case STATE_2PARAM_2:
 579                         if (port->data[0] < 0xf0) {
 580                                 p0 |= port->data[0] >> 4;
 581                                 port->state = STATE_2PARAM_1;
 582                         } else {
 583                                 p0 |= 0x03;
 584                                 port->state = STATE_UNKNOWN;
 585                         }
 586                         output_packet(urb, p0, port->data[0], port->data[1], b);
 587                         break;
 588                 case STATE_SYSEX_0:
 589                         port->data[0] = b;
 590                         port->state = STATE_SYSEX_1;
 591                         break;
 592                 case STATE_SYSEX_1:
 593                         port->data[1] = b;
 594                         port->state = STATE_SYSEX_2;
 595                         break;
 596                 case STATE_SYSEX_2:
 597                         output_packet(urb, p0 | 0x04, port->data[0], port->data[1], b);
 598                         port->state = STATE_SYSEX_0;
 599                         break;
 600                 }
 601         }
 602 }
 603
 604 static void snd_usbmidi_standard_output(struct snd_usb_midi_out_endpoint* ep,
 605                                         struct urb *urb)
 606 {
 607         int p;
 608
 609         /* FIXME: lower-numbered ports can starve higher-numbered ports */
 610         for (p = 0; p < 0x10; ++p) {
 611                 struct usbmidi_out_port* port = &ep->ports[p];
 612                 if (!port->active)
 613                         continue;
 614                 while (urb->transfer_buffer_length + 3 < ep->max_transfer) {
 615                         uint8_t b;
 616                         if (snd_rawmidi_transmit(port->substream, &b, 1) != 1) {
 617                                 port->active = 0;
 618                                 break;
 619                         }
 620                         snd_usbmidi_transmit_byte(port, b, urb);
 621                 }
 622         }
 623 }
 624
 625 static struct usb_protocol_ops snd_usbmidi_standard_ops = {
 626         .input = snd_usbmidi_standard_input,
 627         .output = snd_usbmidi_standard_output,
 628         .output_packet = snd_usbmidi_output_standard_packet,
 629 };
 630
 631 static struct usb_protocol_ops snd_usbmidi_midiman_ops = {
 632         .input = snd_usbmidi_midiman_input,
 633         .output = snd_usbmidi_standard_output,
 634         .output_packet = snd_usbmidi_output_midiman_packet,
 635 };
 636
 637 static struct usb_protocol_ops snd_usbmidi_maudio_broken_running_status_ops = {
 638         .input = snd_usbmidi_maudio_broken_running_status_input,
 639         .output = snd_usbmidi_standard_output,
 640         .output_packet = snd_usbmidi_output_standard_packet,
 641 };
 642
 643 static struct usb_protocol_ops snd_usbmidi_cme_ops = {
 644         .input = snd_usbmidi_cme_input,
 645         .output = snd_usbmidi_standard_output,
 646         .output_packet = snd_usbmidi_output_standard_packet,
 647 };
 648
 649 /*
 650  * AKAI MPD16 protocol:
 651  *
 652  * For control port (endpoint 1):
 653  * ==============================
 654  * One or more chunks consisting of first byte of (0x10 | msg_len) and then a
 655  * SysEx message (msg_len=9 bytes long).
 656  *
 657  * For data port (endpoint 2):
 658  * ===========================
 659  * One or more chunks consisting of first byte of (0x20 | msg_len) and then a
 660  * MIDI message (msg_len bytes long)
 661  *
 662  * Messages sent: Active Sense, Note On, Poly Pressure, Control Change.
 663  */
 664 static void snd_usbmidi_akai_input(struct snd_usb_midi_in_endpoint *ep,
 665                                    uint8_t *buffer, int buffer_length)
 666 {
 667         unsigned int pos = 0;
 668         unsigned int len = (unsigned int)buffer_length;
 669         while (pos < len) {
 670                 unsigned int port = (buffer[pos] >> 4) - 1;
 671                 unsigned int msg_len = buffer[pos] & 0x0f;
 672                 pos++;
 673                 if (pos + msg_len <= len && port < 2)
 674                         snd_usbmidi_input_data(ep, 0, &buffer[pos], msg_len);
 675                 pos += msg_len;
 676         }
 677 }
 678
 679 #define MAX_AKAI_SYSEX_LEN 9
 680
 681 static void snd_usbmidi_akai_output(struct snd_usb_midi_out_endpoint *ep,
 682                                     struct urb *urb)
 683 {
 684         uint8_t *msg;
 685         int pos, end, count, buf_end;
 686         uint8_t tmp[MAX_AKAI_SYSEX_LEN];
 687         struct snd_rawmidi_substream *substream = ep->ports[0].substream;
 688
 689         if (!ep->ports[0].active)
 690                 return;
 691
 692         msg = urb->transfer_buffer + urb->transfer_buffer_length;
 693         buf_end = ep->max_transfer - MAX_AKAI_SYSEX_LEN - 1;
 694
 695         /* only try adding more data when there's space for at least 1 SysEx */
 696         while (urb->transfer_buffer_length < buf_end) {
 697                 count = snd_rawmidi_transmit_peek(substream,
 698                                                   tmp, MAX_AKAI_SYSEX_LEN);
 699                 if (!count) {
 700                         ep->ports[0].active = 0;
 701                         return;
 702                 }
 703                 /* try to skip non-SysEx data */
 704                 for (pos = 0; pos < count && tmp[pos] != 0xF0; pos++)
 705                         ;
 706
 707                 if (pos > 0) {
 708                         snd_rawmidi_transmit_ack(substream, pos);
 709                         continue;
 710                 }
 711
 712                 /* look for the start or end marker */
 713                 for (end = 1; end < count && tmp[end] < 0xF0; end++)
 714                         ;
 715
 716                 /* next SysEx started before the end of current one */
 717                 if (end < count && tmp[end] == 0xF0) {
 718                         /* it's incomplete - drop it */
 719                         snd_rawmidi_transmit_ack(substream, end);
 720                         continue;
 721                 }
 722                 /* SysEx complete */
 723                 if (end < count && tmp[end] == 0xF7) {
 724                         /* queue it, ack it, and get the next one */
 725                         count = end + 1;
 726                         msg[0] = 0x10 | count;
 727                         memcpy(&msg[1], tmp, count);
 728                         snd_rawmidi_transmit_ack(substream, count);
 729                         urb->transfer_buffer_length += count + 1;
 730                         msg += count + 1;
 731                         continue;
 732                 }
 733                 /* less than 9 bytes and no end byte - wait for more */
 734                 if (count < MAX_AKAI_SYSEX_LEN) {
 735                         ep->ports[0].active = 0;
 736                         return;
 737                 }
 738                 /* 9 bytes and no end marker in sight - malformed, skip it */
 739                 snd_rawmidi_transmit_ack(substream, count);
 740         }
 741 }
 742
 743 static struct usb_protocol_ops snd_usbmidi_akai_ops = {
 744         .input = snd_usbmidi_akai_input,
 745         .output = snd_usbmidi_akai_output,
 746 };
 747
 748 /*
 749  * Novation USB MIDI protocol: number of data bytes is in the first byte
 750  * (when receiving) (+1!) or in the second byte (when sending); data begins
 751  * at the third byte.
 752  */
 753
 754 static void snd_usbmidi_novation_input(struct snd_usb_midi_in_endpoint* ep,
 755                                        uint8_t* buffer, int buffer_length)
 756 {
 757         if (buffer_length < 2 || !buffer[0] || buffer_length < buffer[0] + 1)
 758                 return;
 759         snd_usbmidi_input_data(ep, 0, &buffer[2], buffer[0] - 1);
 760 }
 761
 762 static void snd_usbmidi_novation_output(struct snd_usb_midi_out_endpoint* ep,
 763                                         struct urb *urb)
 764 {
 765         uint8_t* transfer_buffer;
 766         int count;
 767
 768         if (!ep->ports[0].active)
 769                 return;
 770         transfer_buffer = urb->transfer_buffer;
 771         count = snd_rawmidi_transmit(ep->ports[0].substream,
 772                                      &transfer_buffer[2],
 773                                      ep->max_transfer - 2);
 774         if (count < 1) {
 775                 ep->ports[0].active = 0;
 776                 return;
 777         }
 778         transfer_buffer[0] = 0;
 779         transfer_buffer[1] = count;
 780         urb->transfer_buffer_length = 2 + count;
 781 }
 782
 783 static struct usb_protocol_ops snd_usbmidi_novation_ops = {
 784         .input = snd_usbmidi_novation_input,
 785         .output = snd_usbmidi_novation_output,
 786 };
 787
 788 /*
 789  * "raw" protocol: just move raw MIDI bytes from/to the endpoint
 790  */
 791
 792 static void snd_usbmidi_raw_input(struct snd_usb_midi_in_endpoint* ep,
 793                                   uint8_t* buffer, int buffer_length)
 794 {
 795         snd_usbmidi_input_data(ep, 0, buffer, buffer_length);
 796 }
 797
 798 static void snd_usbmidi_raw_output(struct snd_usb_midi_out_endpoint* ep,
 799                                    struct urb *urb)
 800 {
 801         int count;
 802
 803         if (!ep->ports[0].active)
 804                 return;
 805         count = snd_rawmidi_transmit(ep->ports[0].substream,
 806                                      urb->transfer_buffer,
 807                                      ep->max_transfer);
 808         if (count < 1) {
 809                 ep->ports[0].active = 0;
 810                 return;
 811         }
 812         urb->transfer_buffer_length = count;
 813 }
 814
 815 static struct usb_protocol_ops snd_usbmidi_raw_ops = {
 816         .input = snd_usbmidi_raw_input,
 817         .output = snd_usbmidi_raw_output,
 818 };
 819
 820 /*
 821  * FTDI protocol: raw MIDI bytes, but input packets have two modem status bytes.
 822  */
 823
 824 static void snd_usbmidi_ftdi_input(struct snd_usb_midi_in_endpoint* ep,
 825                                    uint8_t* buffer, int buffer_length)
 826 {
 827         if (buffer_length > 2)
 828                 snd_usbmidi_input_data(ep, 0, buffer + 2, buffer_length - 2);
 829 }
 830
 831 static struct usb_protocol_ops snd_usbmidi_ftdi_ops = {
 832         .input = snd_usbmidi_ftdi_input,
 833         .output = snd_usbmidi_raw_output,
 834 };
 835
 836 static void snd_usbmidi_us122l_input(struct snd_usb_midi_in_endpoint *ep,
 837                                      uint8_t *buffer, int buffer_length)
 838 {
 839         if (buffer_length != 9)
 840                 return;
 841         buffer_length = 8;
 842         while (buffer_length && buffer[buffer_length - 1] == 0xFD)
 843                 buffer_length--;
 844         if (buffer_length)
 845                 snd_usbmidi_input_data(ep, 0, buffer, buffer_length);
 846 }
 847
 848 static void snd_usbmidi_us122l_output(struct snd_usb_midi_out_endpoint *ep,
 849                                       struct urb *urb)
 850 {
 851         int count;
 852
 853         if (!ep->ports[0].active)
 854                 return;
 855         switch (snd_usb_get_speed(ep->umidi->dev)) {
 856         case USB_SPEED_HIGH:
 857         case USB_SPEED_SUPER:
 858                 count = 1;
 859                 break;
 860         default:
 861                 count = 2;
 862         }
 863         count = snd_rawmidi_transmit(ep->ports[0].substream,
 864                                      urb->transfer_buffer,
 865                                      count);
 866         if (count < 1) {
 867                 ep->ports[0].active = 0;
 868                 return;
 869         }
 870
 871         memset(urb->transfer_buffer + count, 0xFD, ep->max_transfer - count);
 872         urb->transfer_buffer_length = ep->max_transfer;
 873 }
 874
 875 static struct usb_protocol_ops snd_usbmidi_122l_ops = {
 876         .input = snd_usbmidi_us122l_input,
 877         .output = snd_usbmidi_us122l_output,
 878 };
 879
 880 /*
 881  * Emagic USB MIDI protocol: raw MIDI with "F5 xx" port switching.
 882  */
 883
 884 static void snd_usbmidi_emagic_init_out(struct snd_usb_midi_out_endpoint* ep)
 885 {
 886         static const u8 init_data[] = {
 887                 /* initialization magic: "get version" */
 888                 0xf0,
 889                 0x00, 0x20, 0x31,       /* Emagic */
 890                 0x64,                   /* Unitor8 */
 891                 0x0b,                   /* version number request */
 892                 0x00,                   /* command version */
 893                 0x00,                   /* EEPROM, box 0 */
 894                 0xf7
 895         };
 896         send_bulk_static_data(ep, init_data, sizeof(init_data));
 897         /* while we're at it, pour on more magic */
 898         send_bulk_static_data(ep, init_data, sizeof(init_data));
 899 }
 900
 901 static void snd_usbmidi_emagic_finish_out(struct snd_usb_midi_out_endpoint* ep)
 902 {
 903         static const u8 finish_data[] = {
 904                 /* switch to patch mode with last preset */
 905                 0xf0,
 906                 0x00, 0x20, 0x31,       /* Emagic */
 907                 0x64,                   /* Unitor8 */
 908                 0x10,                   /* patch switch command */
 909                 0x00,                   /* command version */
 910                 0x7f,                   /* to all boxes */
 911                 0x40,                   /* last preset in EEPROM */
 912                 0xf7
 913         };
 914         send_bulk_static_data(ep, finish_data, sizeof(finish_data));
 915 }
 916
 917 static void snd_usbmidi_emagic_input(struct snd_usb_midi_in_endpoint* ep,
 918                                      uint8_t* buffer, int buffer_length)
 919 {
 920         int i;
 921
 922         /* FF indicates end of valid data */
 923         for (i = 0; i < buffer_length; ++i)
 924                 if (buffer[i] == 0xff) {
 925                         buffer_length = i;
 926                         break;
 927                 }
 928
 929         /* handle F5 at end of last buffer */
 930         if (ep->seen_f5)
 931                 goto switch_port;
 932
 933         while (buffer_length > 0) {
 934                 /* determine size of data until next F5 */
 935                 for (i = 0; i < buffer_length; ++i)
 936                         if (buffer[i] == 0xf5)
 937                                 break;
 938                 snd_usbmidi_input_data(ep, ep->current_port, buffer, i);
 939                 buffer += i;
 940                 buffer_length -= i;
 941
 942                 if (buffer_length <= 0)
 943                         break;
 944                 /* assert(buffer[0] == 0xf5); */
 945                 ep->seen_f5 = 1;
 946                 ++buffer;
 947                 --buffer_length;
 948
 949         switch_port:
 950                 if (buffer_length <= 0)
 951                         break;
 952                 if (buffer[0] < 0x80) {
 953                         ep->current_port = (buffer[0] - 1) & 15;
 954                         ++buffer;
 955                         --buffer_length;
 956                 }
 957                 ep->seen_f5 = 0;
 958         }
 959 }
 960
 961 static void snd_usbmidi_emagic_output(struct snd_usb_midi_out_endpoint* ep,
 962                                       struct urb *urb)
 963 {
 964         int port0 = ep->current_port;
 965         uint8_t* buf = urb->transfer_buffer;
 966         int buf_free = ep->max_transfer;
 967         int length, i;
 968
 969         for (i = 0; i < 0x10; ++i) {
 970                 /* round-robin, starting at the last current port */
 971                 int portnum = (port0 + i) & 15;
 972                 struct usbmidi_out_port* port = &ep->ports[portnum];
 973
 974                 if (!port->active)
 975                         continue;
 976                 if (snd_rawmidi_transmit_peek(port->substream, buf, 1) != 1) {
 977                         port->active = 0;
 978                         continue;
 979                 }
 980
 981                 if (portnum != ep->current_port) {
 982                         if (buf_free < 2)
 983                                 break;
 984                         ep->current_port = portnum;
 985                         buf[0] = 0xf5;
 986                         buf[1] = (portnum + 1) & 15;
 987                         buf += 2;
 988                         buf_free -= 2;
 989                 }
 990
 991                 if (buf_free < 1)
 992                         break;
 993                 length = snd_rawmidi_transmit(port->substream, buf, buf_free);
 994                 if (length > 0) {
 995                         buf += length;
 996                         buf_free -= length;
 997                         if (buf_free < 1)
 998                                 break;
 999                 }
1000         }
1001         if (buf_free < ep->max_transfer && buf_free > 0) {
1002                 *buf = 0xff;
1003                 --buf_free;
1004         }
1005         urb->transfer_buffer_length = ep->max_transfer - buf_free;
1006 }
1007
1008 static struct usb_protocol_ops snd_usbmidi_emagic_ops = {
1009         .input = snd_usbmidi_emagic_input,
1010         .output = snd_usbmidi_emagic_output,
1011         .init_out_endpoint = snd_usbmidi_emagic_init_out,
1012         .finish_out_endpoint = snd_usbmidi_emagic_finish_out,
1013 };
1014
1015
1016 static void update_roland_altsetting(struct snd_usb_midi* umidi)
1017 {
1018         struct usb_interface *intf;
1019         struct usb_host_interface *hostif;
1020         struct usb_interface_descriptor *intfd;
1021         int is_light_load;
1022
1023         intf = umidi->iface;
1024         is_light_load = intf->cur_altsetting != intf->altsetting;
1025         if (umidi->roland_load_ctl->private_value == is_light_load)
1026                 return;
1027         hostif = &intf->altsetting[umidi->roland_load_ctl->private_value];
1028         intfd = get_iface_desc(hostif);
1029         snd_usbmidi_input_stop(&umidi->list);
1030         usb_set_interface(umidi->dev, intfd->bInterfaceNumber,
1031                           intfd->bAlternateSetting);
1032         snd_usbmidi_input_start(&umidi->list);
1033 }
1034
1035 static void substream_open(struct snd_rawmidi_substream *substream, int open)
1036 {
1037         struct snd_usb_midi* umidi = substream->rmidi->private_data;
1038         struct snd_kcontrol *ctl;
1039
1040         mutex_lock(&umidi->mutex);
1041         if (open) {
1042                 if (umidi->opened++ == 0 && umidi->roland_load_ctl) {
1043                         ctl = umidi->roland_load_ctl;
1044                         ctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
1045                         snd_ctl_notify(umidi->card,
1046                                        SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
1047                         update_roland_altsetting(umidi);
1048                 }
1049         } else {
1050                 if (--umidi->opened == 0 && umidi->roland_load_ctl) {
1051                         ctl = umidi->roland_load_ctl;
1052                         ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
1053                         snd_ctl_notify(umidi->card,
1054                                        SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
1055                 }
1056         }
1057         mutex_unlock(&umidi->mutex);
1058 }
1059
1060 static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
1061 {
1062         struct snd_usb_midi* umidi = substream->rmidi->private_data;
1063         struct usbmidi_out_port* port = NULL;
1064         int i, j;
1065         int err;
1066
1067         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
1068                 if (umidi->endpoints[i].out)
1069                         for (j = 0; j < 0x10; ++j)
1070                                 if (umidi->endpoints[i].out->ports[j].substream == substream) {
1071                                         port = &umidi->endpoints[i].out->ports[j];
1072                                         break;
1073                                 }
1074         if (!port) {
1075                 snd_BUG();
1076                 return -ENXIO;
1077         }
1078         err = usb_autopm_get_interface(umidi->iface);
1079         if (err < 0)
1080                 return -EIO;
1081         substream->runtime->private_data = port;
1082         port->state = STATE_UNKNOWN;
1083         substream_open(substream, 1);
1084         return 0;
1085 }
1086
1087 static int snd_usbmidi_output_close(struct snd_rawmidi_substream *substream)
1088 {
1089         struct snd_usb_midi* umidi = substream->rmidi->private_data;
1090
1091         substream_open(substream, 0);
1092         usb_autopm_put_interface(umidi->iface);
1093         return 0;
1094 }
1095
1096 static void snd_usbmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
1097 {
1098         struct usbmidi_out_port* port = (struct usbmidi_out_port*)substream->runtime->private_data;
1099
1100         port->active = up;
1101         if (up) {
1102                 if (port->ep->umidi->disconnected) {
1103                         /* gobble up remaining bytes to prevent wait in
1104                          * snd_rawmidi_drain_output */
1105                         while (!snd_rawmidi_transmit_empty(substream))
1106                                 snd_rawmidi_transmit_ack(substream, 1);
1107                         return;
1108                 }
1109                 tasklet_schedule(&port->ep->tasklet);
1110         }
1111 }
1112
1113 static void snd_usbmidi_output_drain(struct snd_rawmidi_substream *substream)
1114 {
1115         struct usbmidi_out_port* port = substream->runtime->private_data;
1116         struct snd_usb_midi_out_endpoint *ep = port->ep;
1117         unsigned int drain_urbs;
1118         DEFINE_WAIT(wait);
1119         long timeout = msecs_to_jiffies(50);
1120
1121         if (ep->umidi->disconnected)
1122                 return;
1123         /*
1124          * The substream buffer is empty, but some data might still be in the
1125          * currently active URBs, so we have to wait for those to complete.
1126          */
1127         spin_lock_irq(&ep->buffer_lock);
1128         drain_urbs = ep->active_urbs;
1129         if (drain_urbs) {
1130                 ep->drain_urbs |= drain_urbs;
1131                 do {
1132                         prepare_to_wait(&ep->drain_wait, &wait,
1133                                         TASK_UNINTERRUPTIBLE);
1134                         spin_unlock_irq(&ep->buffer_lock);
1135                         timeout = schedule_timeout(timeout);
1136                         spin_lock_irq(&ep->buffer_lock);
1137                         drain_urbs &= ep->drain_urbs;
1138                 } while (drain_urbs && timeout);
1139                 finish_wait(&ep->drain_wait, &wait);
1140         }
1141         spin_unlock_irq(&ep->buffer_lock);
1142 }
1143
1144 static int snd_usbmidi_input_open(struct snd_rawmidi_substream *substream)
1145 {
1146         substream_open(substream, 1);
1147         return 0;
1148 }
1149
1150 static int snd_usbmidi_input_close(struct snd_rawmidi_substream *substream)
1151 {
1152         substream_open(substream, 0);
1153         return 0;
1154 }
1155
1156 static void snd_usbmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
1157 {
1158         struct snd_usb_midi* umidi = substream->rmidi->private_data;
1159
1160         if (up)
1161                 set_bit(substream->number, &umidi->input_triggered);
1162         else
1163                 clear_bit(substream->number, &umidi->input_triggered);
1164 }
1165
1166 static struct snd_rawmidi_ops snd_usbmidi_output_ops = {
1167         .open = snd_usbmidi_output_open,
1168         .close = snd_usbmidi_output_close,
1169         .trigger = snd_usbmidi_output_trigger,
1170         .drain = snd_usbmidi_output_drain,
1171 };
1172
1173 static struct snd_rawmidi_ops snd_usbmidi_input_ops = {
1174         .open = snd_usbmidi_input_open,
1175         .close = snd_usbmidi_input_close,
1176         .trigger = snd_usbmidi_input_trigger
1177 };
1178
1179 static void free_urb_and_buffer(struct snd_usb_midi *umidi, struct urb *urb,
1180                                 unsigned int buffer_length)
1181 {
1182         usb_free_coherent(umidi->dev, buffer_length,
1183                           urb->transfer_buffer, urb->transfer_dma);
1184         usb_free_urb(urb);
1185 }
1186
1187 /*
1188  * Frees an input endpoint.
1189  * May be called when ep hasn't been initialized completely.
1190  */
1191 static void snd_usbmidi_in_endpoint_delete(struct snd_usb_midi_in_endpoint* ep)
1192 {
1193         unsigned int i;
1194
1195         for (i = 0; i < INPUT_URBS; ++i)
1196                 if (ep->urbs[i])
1197                         free_urb_and_buffer(ep->umidi, ep->urbs[i],
1198                                             ep->urbs[i]->transfer_buffer_length);
1199         kfree(ep);
1200 }
1201
1202 /*
1203  * Creates an input endpoint.
1204  */
1205 static int snd_usbmidi_in_endpoint_create(struct snd_usb_midi* umidi,
1206                                           struct snd_usb_midi_endpoint_info* ep_info,
1207                                           struct snd_usb_midi_endpoint* rep)
1208 {
1209         struct snd_usb_midi_in_endpoint* ep;
1210         void* buffer;
1211         unsigned int pipe;
1212         int length;
1213         unsigned int i;
1214
1215         rep->in = NULL;
1216         ep = kzalloc(sizeof(*ep), GFP_KERNEL);
1217         if (!ep)
1218                 return -ENOMEM;
1219         ep->umidi = umidi;
1220
1221         for (i = 0; i < INPUT_URBS; ++i) {
1222                 ep->urbs[i] = usb_alloc_urb(0, GFP_KERNEL);
1223                 if (!ep->urbs[i]) {
1224                         snd_usbmidi_in_endpoint_delete(ep);
1225                         return -ENOMEM;
1226                 }
1227         }
1228         if (ep_info->in_interval)
1229                 pipe = usb_rcvintpipe(umidi->dev, ep_info->in_ep);
1230         else
1231                 pipe = usb_rcvbulkpipe(umidi->dev, ep_info->in_ep);
1232         length = usb_maxpacket(umidi->dev, pipe, 0);
1233         for (i = 0; i < INPUT_URBS; ++i) {
1234                 buffer = usb_alloc_coherent(umidi->dev, length, GFP_KERNEL,
1235                                             &ep->urbs[i]->transfer_dma);
1236                 if (!buffer) {
1237                         snd_usbmidi_in_endpoint_delete(ep);
1238                         return -ENOMEM;
1239                 }
1240                 if (ep_info->in_interval)
1241                         usb_fill_int_urb(ep->urbs[i], umidi->dev,
1242                                          pipe, buffer, length,
1243                                          snd_usbmidi_in_urb_complete,
1244                                          ep, ep_info->in_interval);
1245                 else
1246                         usb_fill_bulk_urb(ep->urbs[i], umidi->dev,
1247                                           pipe, buffer, length,
1248                                           snd_usbmidi_in_urb_complete, ep);
1249                 ep->urbs[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1250         }
1251
1252         rep->in = ep;
1253         return 0;
1254 }
1255
1256 /*
1257  * Frees an output endpoint.
1258  * May be called when ep hasn't been initialized completely.
1259  */
1260 static void snd_usbmidi_out_endpoint_clear(struct snd_usb_midi_out_endpoint *ep)
1261 {
1262         unsigned int i;
1263
1264         for (i = 0; i < OUTPUT_URBS; ++i)
1265                 if (ep->urbs[i].urb) {
1266                         free_urb_and_buffer(ep->umidi, ep->urbs[i].urb,
1267                                             ep->max_transfer);
1268                         ep->urbs[i].urb = NULL;
1269                 }
1270 }
1271
1272 static void snd_usbmidi_out_endpoint_delete(struct snd_usb_midi_out_endpoint *ep)
1273 {
1274         snd_usbmidi_out_endpoint_clear(ep);
1275         kfree(ep);
1276 }
1277
1278 /*
1279  * Creates an output endpoint, and initializes output ports.
1280  */
1281 static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi* umidi,
1282                                            struct snd_usb_midi_endpoint_info* ep_info,
1283                                            struct snd_usb_midi_endpoint* rep)
1284 {
1285         struct snd_usb_midi_out_endpoint* ep;
1286         unsigned int i;
1287         unsigned int pipe;
1288         void* buffer;
1289
1290         rep->out = NULL;
1291         ep = kzalloc(sizeof(*ep), GFP_KERNEL);
1292         if (!ep)
1293                 return -ENOMEM;
1294         ep->umidi = umidi;
1295
1296         for (i = 0; i < OUTPUT_URBS; ++i) {
1297                 ep->urbs[i].urb = usb_alloc_urb(0, GFP_KERNEL);
1298                 if (!ep->urbs[i].urb) {
1299                         snd_usbmidi_out_endpoint_delete(ep);
1300                         return -ENOMEM;
1301                 }
1302                 ep->urbs[i].ep = ep;
1303         }
1304         if (ep_info->out_interval)
1305                 pipe = usb_sndintpipe(umidi->dev, ep_info->out_ep);
1306         else
1307                 pipe = usb_sndbulkpipe(umidi->dev, ep_info->out_ep);
1308         switch (umidi->usb_id) {
1309         default:
1310                 ep->max_transfer = usb_maxpacket(umidi->dev, pipe, 1);
1311                 break;
1312                 /*
1313                  * Various chips declare a packet size larger than 4 bytes, but
1314                  * do not actually work with larger packets:
1315                  */
1316         case USB_ID(0x0a92, 0x1020): /* ESI M4U */
1317         case USB_ID(0x1430, 0x474b): /* RedOctane GH MIDI INTERFACE */
1318         case USB_ID(0x15ca, 0x0101): /* Textech USB Midi Cable */
1319         case USB_ID(0x15ca, 0x1806): /* Textech USB Midi Cable */
1320         case USB_ID(0x1a86, 0x752d): /* QinHeng CH345 "USB2.0-MIDI" */
1321         case USB_ID(0xfc08, 0x0101): /* Unknown vendor Cable */
1322                 ep->max_transfer = 4;
1323                 break;
1324                 /*
1325                  * Some devices only work with 9 bytes packet size:
1326                  */
1327         case USB_ID(0x0644, 0x800E): /* Tascam US-122L */
1328         case USB_ID(0x0644, 0x800F): /* Tascam US-144 */
1329                 ep->max_transfer = 9;
1330                 break;
1331         }
1332         for (i = 0; i < OUTPUT_URBS; ++i) {
1333                 buffer = usb_alloc_coherent(umidi->dev,
1334                                             ep->max_transfer, GFP_KERNEL,
1335                                             &ep->urbs[i].urb->transfer_dma);
1336                 if (!buffer) {
1337                         snd_usbmidi_out_endpoint_delete(ep);
1338                         return -ENOMEM;
1339                 }
1340                 if (ep_info->out_interval)
1341                         usb_fill_int_urb(ep->urbs[i].urb, umidi->dev,
1342                                          pipe, buffer, ep->max_transfer,
1343                                          snd_usbmidi_out_urb_complete,
1344                                          &ep->urbs[i], ep_info->out_interval);
1345                 else
1346                         usb_fill_bulk_urb(ep->urbs[i].urb, umidi->dev,
1347                                           pipe, buffer, ep->max_transfer,
1348                                           snd_usbmidi_out_urb_complete,
1349                                           &ep->urbs[i]);
1350                 ep->urbs[i].urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1351         }
1352
1353         spin_lock_init(&ep->buffer_lock);
1354         tasklet_init(&ep->tasklet, snd_usbmidi_out_tasklet, (unsigned long)ep);
1355         init_waitqueue_head(&ep->drain_wait);
1356
1357         for (i = 0; i < 0x10; ++i)
1358                 if (ep_info->out_cables & (1 << i)) {
1359                         ep->ports[i].ep = ep;
1360                         ep->ports[i].cable = i << 4;
1361                 }
1362
1363         if (umidi->usb_protocol_ops->init_out_endpoint)
1364                 umidi->usb_protocol_ops->init_out_endpoint(ep);
1365
1366         rep->out = ep;
1367         return 0;
1368 }
1369
1370 /*
1371  * Frees everything.
1372  */
1373 static void snd_usbmidi_free(struct snd_usb_midi* umidi)
1374 {
1375         int i;
1376
1377         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1378                 struct snd_usb_midi_endpoint* ep = &umidi->endpoints[i];
1379                 if (ep->out)
1380                         snd_usbmidi_out_endpoint_delete(ep->out);
1381                 if (ep->in)
1382                         snd_usbmidi_in_endpoint_delete(ep->in);
1383         }
1384         mutex_destroy(&umidi->mutex);
1385         kfree(umidi);
1386 }
1387
1388 /*
1389  * Unlinks all URBs (must be done before the usb_device is deleted).
1390  */
1391 void snd_usbmidi_disconnect(struct list_head* p)
1392 {
1393         struct snd_usb_midi* umidi;
1394         unsigned int i, j;
1395
1396         umidi = list_entry(p, struct snd_usb_midi, list);
1397         /*
1398          * an URB's completion handler may start the timer and
1399          * a timer may submit an URB. To reliably break the cycle
1400          * a flag under lock must be used
1401          */
1402         spin_lock_irq(&umidi->disc_lock);
1403         umidi->disconnected = 1;
1404         spin_unlock_irq(&umidi->disc_lock);
1405         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1406                 struct snd_usb_midi_endpoint* ep = &umidi->endpoints[i];
1407                 if (ep->out)
1408                         tasklet_kill(&ep->out->tasklet);
1409                 if (ep->out) {
1410                         for (j = 0; j < OUTPUT_URBS; ++j)
1411                                 usb_kill_urb(ep->out->urbs[j].urb);
1412                         if (umidi->usb_protocol_ops->finish_out_endpoint)
1413                                 umidi->usb_protocol_ops->finish_out_endpoint(ep->out);
1414                         ep->out->active_urbs = 0;
1415                         if (ep->out->drain_urbs) {
1416                                 ep->out->drain_urbs = 0;
1417                                 wake_up(&ep->out->drain_wait);
1418                         }
1419                 }
1420                 if (ep->in)
1421                         for (j = 0; j < INPUT_URBS; ++j)
1422                                 usb_kill_urb(ep->in->urbs[j]);
1423                 /* free endpoints here; later call can result in Oops */
1424                 if (ep->out)
1425                         snd_usbmidi_out_endpoint_clear(ep->out);
1426                 if (ep->in) {
1427                         snd_usbmidi_in_endpoint_delete(ep->in);
1428                         ep->in = NULL;
1429                 }
1430         }
1431         del_timer_sync(&umidi->error_timer);
1432 }
1433
1434 static void snd_usbmidi_rawmidi_free(struct snd_rawmidi *rmidi)
1435 {
1436         struct snd_usb_midi* umidi = rmidi->private_data;
1437         snd_usbmidi_free(umidi);
1438 }
1439
1440 static struct snd_rawmidi_substream *snd_usbmidi_find_substream(struct snd_usb_midi* umidi,
1441                                                                 int stream, int number)
1442 {
1443         struct list_head* list;
1444
1445         list_for_each(list, &umidi->rmidi->streams[stream].substreams) {
1446                 struct snd_rawmidi_substream *substream = list_entry(list, struct snd_rawmidi_substream, list);
1447                 if (substream->number == number)
1448                         return substream;
1449         }
1450         return NULL;
1451 }
1452
1453 /*
1454  * This list specifies names for ports that do not fit into the standard
1455  * "(product) MIDI (n)" schema because they aren't external MIDI ports,
1456  * such as internal control or synthesizer ports.
1457  */
1458 static struct port_info {
1459         u32 id;
1460         short int port;
1461         short int voices;
1462         const char *name;
1463         unsigned int seq_flags;
1464 } snd_usbmidi_port_info[] = {
1465 #define PORT_INFO(vendor, product, num, name_, voices_, flags) \
1466         { .id = USB_ID(vendor, product), \
1467           .port = num, .voices = voices_, \
1468           .name = name_, .seq_flags = flags }
1469 #define EXTERNAL_PORT(vendor, product, num, name) \
1470         PORT_INFO(vendor, product, num, name, 0, \
1471                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1472                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1473                   SNDRV_SEQ_PORT_TYPE_PORT)
1474 #define CONTROL_PORT(vendor, product, num, name) \
1475         PORT_INFO(vendor, product, num, name, 0, \
1476                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1477                   SNDRV_SEQ_PORT_TYPE_HARDWARE)
1478 #define ROLAND_SYNTH_PORT(vendor, product, num, name, voices) \
1479         PORT_INFO(vendor, product, num, name, voices, \
1480                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1481                   SNDRV_SEQ_PORT_TYPE_MIDI_GM | \
1482                   SNDRV_SEQ_PORT_TYPE_MIDI_GM2 | \
1483                   SNDRV_SEQ_PORT_TYPE_MIDI_GS | \
1484                   SNDRV_SEQ_PORT_TYPE_MIDI_XG | \
1485                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1486                   SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
1487 #define SOUNDCANVAS_PORT(vendor, product, num, name, voices) \
1488         PORT_INFO(vendor, product, num, name, voices, \
1489                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1490                   SNDRV_SEQ_PORT_TYPE_MIDI_GM | \
1491                   SNDRV_SEQ_PORT_TYPE_MIDI_GM2 | \
1492                   SNDRV_SEQ_PORT_TYPE_MIDI_GS | \
1493                   SNDRV_SEQ_PORT_TYPE_MIDI_XG | \
1494                   SNDRV_SEQ_PORT_TYPE_MIDI_MT32 | \
1495                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1496                   SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
1497         /* Roland UA-100 */
1498         CONTROL_PORT(0x0582, 0x0000, 2, "%s Control"),
1499         /* Roland SC-8850 */
1500         SOUNDCANVAS_PORT(0x0582, 0x0003, 0, "%s Part A", 128),
1501         SOUNDCANVAS_PORT(0x0582, 0x0003, 1, "%s Part B", 128),
1502         SOUNDCANVAS_PORT(0x0582, 0x0003, 2, "%s Part C", 128),
1503         SOUNDCANVAS_PORT(0x0582, 0x0003, 3, "%s Part D", 128),
1504         EXTERNAL_PORT(0x0582, 0x0003, 4, "%s MIDI 1"),
1505         EXTERNAL_PORT(0x0582, 0x0003, 5, "%s MIDI 2"),
1506         /* Roland U-8 */
1507         EXTERNAL_PORT(0x0582, 0x0004, 0, "%s MIDI"),
1508         CONTROL_PORT(0x0582, 0x0004, 1, "%s Control"),
1509         /* Roland SC-8820 */
1510         SOUNDCANVAS_PORT(0x0582, 0x0007, 0, "%s Part A", 64),
1511         SOUNDCANVAS_PORT(0x0582, 0x0007, 1, "%s Part B", 64),
1512         EXTERNAL_PORT(0x0582, 0x0007, 2, "%s MIDI"),
1513         /* Roland SK-500 */
1514         SOUNDCANVAS_PORT(0x0582, 0x000b, 0, "%s Part A", 64),
1515         SOUNDCANVAS_PORT(0x0582, 0x000b, 1, "%s Part B", 64),
1516         EXTERNAL_PORT(0x0582, 0x000b, 2, "%s MIDI"),
1517         /* Roland SC-D70 */
1518         SOUNDCANVAS_PORT(0x0582, 0x000c, 0, "%s Part A", 64),
1519         SOUNDCANVAS_PORT(0x0582, 0x000c, 1, "%s Part B", 64),
1520         EXTERNAL_PORT(0x0582, 0x000c, 2, "%s MIDI"),
1521         /* Edirol UM-880 */
1522         CONTROL_PORT(0x0582, 0x0014, 8, "%s Control"),
1523         /* Edirol SD-90 */
1524         ROLAND_SYNTH_PORT(0x0582, 0x0016, 0, "%s Part A", 128),
1525         ROLAND_SYNTH_PORT(0x0582, 0x0016, 1, "%s Part B", 128),
1526         EXTERNAL_PORT(0x0582, 0x0016, 2, "%s MIDI 1"),
1527         EXTERNAL_PORT(0x0582, 0x0016, 3, "%s MIDI 2"),
1528         /* Edirol UM-550 */
1529         CONTROL_PORT(0x0582, 0x0023, 5, "%s Control"),
1530         /* Edirol SD-20 */
1531         ROLAND_SYNTH_PORT(0x0582, 0x0027, 0, "%s Part A", 64),
1532         ROLAND_SYNTH_PORT(0x0582, 0x0027, 1, "%s Part B", 64),
1533         EXTERNAL_PORT(0x0582, 0x0027, 2, "%s MIDI"),
1534         /* Edirol SD-80 */
1535         ROLAND_SYNTH_PORT(0x0582, 0x0029, 0, "%s Part A", 128),
1536         ROLAND_SYNTH_PORT(0x0582, 0x0029, 1, "%s Part B", 128),
1537         EXTERNAL_PORT(0x0582, 0x0029, 2, "%s MIDI 1"),
1538         EXTERNAL_PORT(0x0582, 0x0029, 3, "%s MIDI 2"),
1539         /* Edirol UA-700 */
1540         EXTERNAL_PORT(0x0582, 0x002b, 0, "%s MIDI"),
1541         CONTROL_PORT(0x0582, 0x002b, 1, "%s Control"),
1542         /* Roland VariOS */
1543         EXTERNAL_PORT(0x0582, 0x002f, 0, "%s MIDI"),
1544         EXTERNAL_PORT(0x0582, 0x002f, 1, "%s External MIDI"),
1545         EXTERNAL_PORT(0x0582, 0x002f, 2, "%s Sync"),
1546         /* Edirol PCR */
1547         EXTERNAL_PORT(0x0582, 0x0033, 0, "%s MIDI"),
1548         EXTERNAL_PORT(0x0582, 0x0033, 1, "%s 1"),
1549         EXTERNAL_PORT(0x0582, 0x0033, 2, "%s 2"),
1550         /* BOSS GS-10 */
1551         EXTERNAL_PORT(0x0582, 0x003b, 0, "%s MIDI"),
1552         CONTROL_PORT(0x0582, 0x003b, 1, "%s Control"),
1553         /* Edirol UA-1000 */
1554         EXTERNAL_PORT(0x0582, 0x0044, 0, "%s MIDI"),
1555         CONTROL_PORT(0x0582, 0x0044, 1, "%s Control"),
1556         /* Edirol UR-80 */
1557         EXTERNAL_PORT(0x0582, 0x0048, 0, "%s MIDI"),
1558         EXTERNAL_PORT(0x0582, 0x0048, 1, "%s 1"),
1559         EXTERNAL_PORT(0x0582, 0x0048, 2, "%s 2"),
1560         /* Edirol PCR-A */
1561         EXTERNAL_PORT(0x0582, 0x004d, 0, "%s MIDI"),
1562         EXTERNAL_PORT(0x0582, 0x004d, 1, "%s 1"),
1563         EXTERNAL_PORT(0x0582, 0x004d, 2, "%s 2"),
1564         /* Edirol UM-3EX */
1565         CONTROL_PORT(0x0582, 0x009a, 3, "%s Control"),
1566         /* M-Audio MidiSport 8x8 */
1567         CONTROL_PORT(0x0763, 0x1031, 8, "%s Control"),
1568         CONTROL_PORT(0x0763, 0x1033, 8, "%s Control"),
1569         /* MOTU Fastlane */
1570         EXTERNAL_PORT(0x07fd, 0x0001, 0, "%s MIDI A"),
1571         EXTERNAL_PORT(0x07fd, 0x0001, 1, "%s MIDI B"),
1572         /* Emagic Unitor8/AMT8/MT4 */
1573         EXTERNAL_PORT(0x086a, 0x0001, 8, "%s Broadcast"),
1574         EXTERNAL_PORT(0x086a, 0x0002, 8, "%s Broadcast"),
1575         EXTERNAL_PORT(0x086a, 0x0003, 4, "%s Broadcast"),
1576         /* Akai MPD16 */
1577         CONTROL_PORT(0x09e8, 0x0062, 0, "%s Control"),
1578         PORT_INFO(0x09e8, 0x0062, 1, "%s MIDI", 0,
1579                 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
1580                 SNDRV_SEQ_PORT_TYPE_HARDWARE),
1581         /* Access Music Virus TI */
1582         EXTERNAL_PORT(0x133e, 0x0815, 0, "%s MIDI"),
1583         PORT_INFO(0x133e, 0x0815, 1, "%s Synth", 0,
1584                 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
1585                 SNDRV_SEQ_PORT_TYPE_HARDWARE |
1586                 SNDRV_SEQ_PORT_TYPE_SYNTHESIZER),
1587 };
1588
1589 static struct port_info *find_port_info(struct snd_usb_midi* umidi, int number)
1590 {
1591         int i;
1592
1593         for (i = 0; i < ARRAY_SIZE(snd_usbmidi_port_info); ++i) {
1594                 if (snd_usbmidi_port_info[i].id == umidi->usb_id &&
1595                     snd_usbmidi_port_info[i].port == number)
1596                         return &snd_usbmidi_port_info[i];
1597         }
1598         return NULL;
1599 }
1600
1601 static void snd_usbmidi_get_port_info(struct snd_rawmidi *rmidi, int number,
1602                                       struct snd_seq_port_info *seq_port_info)
1603 {
1604         struct snd_usb_midi *umidi = rmidi->private_data;
1605         struct port_info *port_info;
1606
1607         /* TODO: read port flags from descriptors */
1608         port_info = find_port_info(umidi, number);
1609         if (port_info) {
1610                 seq_port_info->type = port_info->seq_flags;
1611                 seq_port_info->midi_voices = port_info->voices;
1612         }
1613 }
1614
1615 static void snd_usbmidi_init_substream(struct snd_usb_midi* umidi,
1616                                        int stream, int number,
1617                                        struct snd_rawmidi_substream ** rsubstream)
1618 {
1619         struct port_info *port_info;
1620         const char *name_format;
1621
1622         struct snd_rawmidi_substream *substream = snd_usbmidi_find_substream(umidi, stream, number);
1623         if (!substream) {
1624                 snd_printd(KERN_ERR "substream %d:%d not found\n", stream, number);
1625                 return;
1626         }
1627
1628         /* TODO: read port name from jack descriptor */
1629         port_info = find_port_info(umidi, number);
1630         name_format = port_info ? port_info->name : "%s MIDI %d";
1631         snprintf(substream->name, sizeof(substream->name),
1632                  name_format, umidi->card->shortname, number + 1);
1633
1634         *rsubstream = substream;
1635 }
1636
1637 /*
1638  * Creates the endpoints and their ports.
1639  */
1640 static int snd_usbmidi_create_endpoints(struct snd_usb_midi* umidi,
1641                                         struct snd_usb_midi_endpoint_info* endpoints)
1642 {
1643         int i, j, err;
1644         int out_ports = 0, in_ports = 0;
1645
1646         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1647                 if (endpoints[i].out_cables) {
1648                         err = snd_usbmidi_out_endpoint_create(umidi, &endpoints[i],
1649                                                               &umidi->endpoints[i]);
1650                         if (err < 0)
1651                                 return err;
1652                 }
1653                 if (endpoints[i].in_cables) {
1654                         err = snd_usbmidi_in_endpoint_create(umidi, &endpoints[i],
1655                                                              &umidi->endpoints[i]);
1656                         if (err < 0)
1657                                 return err;
1658                 }
1659
1660                 for (j = 0; j < 0x10; ++j) {
1661                         if (endpoints[i].out_cables & (1 << j)) {
1662                                 snd_usbmidi_init_substream(umidi, SNDRV_RAWMIDI_STREAM_OUTPUT, out_ports,
1663                                                            &umidi->endpoints[i].out->ports[j].substream);
1664                                 ++out_ports;
1665                         }
1666                         if (endpoints[i].in_cables & (1 << j)) {
1667                                 snd_usbmidi_init_substream(umidi, SNDRV_RAWMIDI_STREAM_INPUT, in_ports,
1668                                                            &umidi->endpoints[i].in->ports[j].substream);
1669                                 ++in_ports;
1670                         }
1671                 }
1672         }
1673         snd_printdd(KERN_INFO "created %d output and %d input ports\n",
1674                     out_ports, in_ports);
1675         return 0;
1676 }
1677
1678 /*
1679  * Returns MIDIStreaming device capabilities.
1680  */
1681 static int snd_usbmidi_get_ms_info(struct snd_usb_midi* umidi,
1682                                    struct snd_usb_midi_endpoint_info* endpoints)
1683 {
1684         struct usb_interface* intf;
1685         struct usb_host_interface *hostif;
1686         struct usb_interface_descriptor* intfd;
1687         struct usb_ms_header_descriptor* ms_header;
1688         struct usb_host_endpoint *hostep;
1689         struct usb_endpoint_descriptor* ep;
1690         struct usb_ms_endpoint_descriptor* ms_ep;
1691         int i, epidx;
1692
1693         intf = umidi->iface;
1694         if (!intf)
1695                 return -ENXIO;
1696         hostif = &intf->altsetting[0];
1697         intfd = get_iface_desc(hostif);
1698         ms_header = (struct usb_ms_header_descriptor*)hostif->extra;
1699         if (hostif->extralen >= 7 &&
1700             ms_header->bLength >= 7 &&
1701             ms_header->bDescriptorType == USB_DT_CS_INTERFACE &&
1702             ms_header->bDescriptorSubtype == UAC_HEADER)
1703                 snd_printdd(KERN_INFO "MIDIStreaming version %02x.%02x\n",
1704                             ms_header->bcdMSC[1], ms_header->bcdMSC[0]);
1705         else
1706                 snd_printk(KERN_WARNING "MIDIStreaming interface descriptor not found\n");
1707
1708         epidx = 0;
1709         for (i = 0; i < intfd->bNumEndpoints; ++i) {
1710                 hostep = &hostif->endpoint[i];
1711                 ep = get_ep_desc(hostep);
1712                 if (!usb_endpoint_xfer_bulk(ep) && !usb_endpoint_xfer_int(ep))
1713                         continue;
1714                 ms_ep = (struct usb_ms_endpoint_descriptor*)hostep->extra;
1715                 if (hostep->extralen < 4 ||
1716                     ms_ep->bLength < 4 ||
1717                     ms_ep->bDescriptorType != USB_DT_CS_ENDPOINT ||
1718                     ms_ep->bDescriptorSubtype != UAC_MS_GENERAL)
1719                         continue;
1720                 if (usb_endpoint_dir_out(ep)) {
1721                         if (endpoints[epidx].out_ep) {
1722                                 if (++epidx >= MIDI_MAX_ENDPOINTS) {
1723                                         snd_printk(KERN_WARNING "too many endpoints\n");
1724                                         break;
1725                                 }
1726                         }
1727                         endpoints[epidx].out_ep = usb_endpoint_num(ep);
1728                         if (usb_endpoint_xfer_int(ep))
1729                                 endpoints[epidx].out_interval = ep->bInterval;
1730                         else if (snd_usb_get_speed(umidi->dev) == USB_SPEED_LOW)
1731                                 /*
1732                                  * Low speed bulk transfers don't exist, so
1733                                  * force interrupt transfers for devices like
1734                                  * ESI MIDI Mate that try to use them anyway.
1735                                  */
1736                                 endpoints[epidx].out_interval = 1;
1737                         endpoints[epidx].out_cables = (1 << ms_ep->bNumEmbMIDIJack) - 1;
1738                         snd_printdd(KERN_INFO "EP %02X: %d jack(s)\n",
1739                                     ep->bEndpointAddress, ms_ep->bNumEmbMIDIJack);
1740                 } else {
1741                         if (endpoints[epidx].in_ep) {
1742                                 if (++epidx >= MIDI_MAX_ENDPOINTS) {
1743                                         snd_printk(KERN_WARNING "too many endpoints\n");
1744                                         break;
1745                                 }
1746                         }
1747                         endpoints[epidx].in_ep = usb_endpoint_num(ep);
1748                         if (usb_endpoint_xfer_int(ep))
1749                                 endpoints[epidx].in_interval = ep->bInterval;
1750                         else if (snd_usb_get_speed(umidi->dev) == USB_SPEED_LOW)
1751                                 endpoints[epidx].in_interval = 1;
1752                         endpoints[epidx].in_cables = (1 << ms_ep->bNumEmbMIDIJack) - 1;
1753                         snd_printdd(KERN_INFO "EP %02X: %d jack(s)\n",
1754                                     ep->bEndpointAddress, ms_ep->bNumEmbMIDIJack);
1755                 }
1756         }
1757         return 0;
1758 }
1759
1760 static int roland_load_info(struct snd_kcontrol *kcontrol,
1761                             struct snd_ctl_elem_info *info)
1762 {
1763         static const char *const names[] = { "High Load", "Light Load" };
1764
1765         return snd_ctl_enum_info(info, 1, 2, names);
1766 }
1767
1768 static int roland_load_get(struct snd_kcontrol *kcontrol,
1769                            struct snd_ctl_elem_value *value)
1770 {
1771         value->value.enumerated.item[0] = kcontrol->private_value;
1772         return 0;
1773 }
1774
1775 static int roland_load_put(struct snd_kcontrol *kcontrol,
1776                            struct snd_ctl_elem_value *value)
1777 {
1778         struct snd_usb_midi* umidi = kcontrol->private_data;
1779         int changed;
1780
1781         if (value->value.enumerated.item[0] > 1)
1782                 return -EINVAL;
1783         mutex_lock(&umidi->mutex);
1784         changed = value->value.enumerated.item[0] != kcontrol->private_value;
1785         if (changed)
1786                 kcontrol->private_value = value->value.enumerated.item[0];
1787         mutex_unlock(&umidi->mutex);
1788         return changed;
1789 }
1790
1791 static struct snd_kcontrol_new roland_load_ctl = {
1792         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1793         .name = "MIDI Input Mode",
1794         .info = roland_load_info,
1795         .get = roland_load_get,
1796         .put = roland_load_put,
1797         .private_value = 1,
1798 };
1799
1800 /*
1801  * On Roland devices, use the second alternate setting to be able to use
1802  * the interrupt input endpoint.
1803  */
1804 static void snd_usbmidi_switch_roland_altsetting(struct snd_usb_midi* umidi)
1805 {
1806         struct usb_interface* intf;
1807         struct usb_host_interface *hostif;
1808         struct usb_interface_descriptor* intfd;
1809
1810         intf = umidi->iface;
1811         if (!intf || intf->num_altsetting != 2)
1812                 return;
1813
1814         hostif = &intf->altsetting[1];
1815         intfd = get_iface_desc(hostif);
1816         if (intfd->bNumEndpoints != 2 ||
1817             (get_endpoint(hostif, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_BULK ||
1818             (get_endpoint(hostif, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_INT)
1819                 return;
1820
1821         snd_printdd(KERN_INFO "switching to altsetting %d with int ep\n",
1822                     intfd->bAlternateSetting);
1823         usb_set_interface(umidi->dev, intfd->bInterfaceNumber,
1824                           intfd->bAlternateSetting);
1825
1826         umidi->roland_load_ctl = snd_ctl_new1(&roland_load_ctl, umidi);
1827         if (snd_ctl_add(umidi->card, umidi->roland_load_ctl) < 0)
1828                 umidi->roland_load_ctl = NULL;
1829 }
1830
1831 /*
1832  * Try to find any usable endpoints in the interface.
1833  */
1834 static int snd_usbmidi_detect_endpoints(struct snd_usb_midi* umidi,
1835                                         struct snd_usb_midi_endpoint_info* endpoint,
1836                                         int max_endpoints)
1837 {
1838         struct usb_interface* intf;
1839         struct usb_host_interface *hostif;
1840         struct usb_interface_descriptor* intfd;
1841         struct usb_endpoint_descriptor* epd;
1842         int i, out_eps = 0, in_eps = 0;
1843
1844         if (USB_ID_VENDOR(umidi->usb_id) == 0x0582)
1845                 snd_usbmidi_switch_roland_altsetting(umidi);
1846
1847         if (endpoint[0].out_ep || endpoint[0].in_ep)
1848                 return 0;
1849
1850         intf = umidi->iface;
1851         if (!intf || intf->num_altsetting < 1)
1852                 return -ENOENT;
1853         hostif = intf->cur_altsetting;
1854         intfd = get_iface_desc(hostif);
1855
1856         for (i = 0; i < intfd->bNumEndpoints; ++i) {
1857                 epd = get_endpoint(hostif, i);
1858                 if (!usb_endpoint_xfer_bulk(epd) &&
1859                     !usb_endpoint_xfer_int(epd))
1860                         continue;
1861                 if (out_eps < max_endpoints &&
1862                     usb_endpoint_dir_out(epd)) {
1863                         endpoint[out_eps].out_ep = usb_endpoint_num(epd);
1864                         if (usb_endpoint_xfer_int(epd))
1865                                 endpoint[out_eps].out_interval = epd->bInterval;
1866                         ++out_eps;
1867                 }
1868                 if (in_eps < max_endpoints &&
1869                     usb_endpoint_dir_in(epd)) {
1870                         endpoint[in_eps].in_ep = usb_endpoint_num(epd);
1871                         if (usb_endpoint_xfer_int(epd))
1872                                 endpoint[in_eps].in_interval = epd->bInterval;
1873                         ++in_eps;
1874                 }
1875         }
1876         return (out_eps || in_eps) ? 0 : -ENOENT;
1877 }
1878
1879 /*
1880  * Detects the endpoints for one-port-per-endpoint protocols.
1881  */
1882 static int snd_usbmidi_detect_per_port_endpoints(struct snd_usb_midi* umidi,
1883                                                  struct snd_usb_midi_endpoint_info* endpoints)
1884 {
1885         int err, i;
1886
1887         err = snd_usbmidi_detect_endpoints(umidi, endpoints, MIDI_MAX_ENDPOINTS);
1888         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1889                 if (endpoints[i].out_ep)
1890                         endpoints[i].out_cables = 0x0001;
1891                 if (endpoints[i].in_ep)
1892                         endpoints[i].in_cables = 0x0001;
1893         }
1894         return err;
1895 }
1896
1897 /*
1898  * Detects the endpoints and ports of Yamaha devices.
1899  */
1900 static int snd_usbmidi_detect_yamaha(struct snd_usb_midi* umidi,
1901                                      struct snd_usb_midi_endpoint_info* endpoint)
1902 {
1903         struct usb_interface* intf;
1904         struct usb_host_interface *hostif;
1905         struct usb_interface_descriptor* intfd;
1906         uint8_t* cs_desc;
1907
1908         intf = umidi->iface;
1909         if (!intf)
1910                 return -ENOENT;
1911         hostif = intf->altsetting;
1912         intfd = get_iface_desc(hostif);
1913         if (intfd->bNumEndpoints < 1)
1914                 return -ENOENT;
1915
1916         /*
1917          * For each port there is one MIDI_IN/OUT_JACK descriptor, not
1918          * necessarily with any useful contents.  So simply count 'em.
1919          */
1920         for (cs_desc = hostif->extra;
1921              cs_desc < hostif->extra + hostif->extralen && cs_desc[0] >= 2;
1922              cs_desc += cs_desc[0]) {
1923                 if (cs_desc[1] == USB_DT_CS_INTERFACE) {
1924                         if (cs_desc[2] == UAC_MIDI_IN_JACK)
1925                                 endpoint->in_cables = (endpoint->in_cables << 1) | 1;
1926                         else if (cs_desc[2] == UAC_MIDI_OUT_JACK)
1927                                 endpoint->out_cables = (endpoint->out_cables << 1) | 1;
1928                 }
1929         }
1930         if (!endpoint->in_cables && !endpoint->out_cables)
1931                 return -ENOENT;
1932
1933         return snd_usbmidi_detect_endpoints(umidi, endpoint, 1);
1934 }
1935
1936 /*
1937  * Creates the endpoints and their ports for Midiman devices.
1938  */
1939 static int snd_usbmidi_create_endpoints_midiman(struct snd_usb_midi* umidi,
1940                                                 struct snd_usb_midi_endpoint_info* endpoint)
1941 {
1942         struct snd_usb_midi_endpoint_info ep_info;
1943         struct usb_interface* intf;
1944         struct usb_host_interface *hostif;
1945         struct usb_interface_descriptor* intfd;
1946         struct usb_endpoint_descriptor* epd;
1947         int cable, err;
1948
1949         intf = umidi->iface;
1950         if (!intf)
1951                 return -ENOENT;
1952         hostif = intf->altsetting;
1953         intfd = get_iface_desc(hostif);
1954         /*
1955          * The various MidiSport devices have more or less random endpoint
1956          * numbers, so we have to identify the endpoints by their index in
1957          * the descriptor array, like the driver for that other OS does.
1958          *
1959          * There is one interrupt input endpoint for all input ports, one
1960          * bulk output endpoint for even-numbered ports, and one for odd-
1961          * numbered ports.  Both bulk output endpoints have corresponding
1962          * input bulk endpoints (at indices 1 and 3) which aren't used.
1963          */
1964         if (intfd->bNumEndpoints < (endpoint->out_cables > 0x0001 ? 5 : 3)) {
1965                 snd_printdd(KERN_ERR "not enough endpoints\n");
1966                 return -ENOENT;
1967         }
1968
1969         epd = get_endpoint(hostif, 0);
1970         if (!usb_endpoint_dir_in(epd) || !usb_endpoint_xfer_int(epd)) {
1971                 snd_printdd(KERN_ERR "endpoint[0] isn't interrupt\n");
1972                 return -ENXIO;
1973         }
1974         epd = get_endpoint(hostif, 2);
1975         if (!usb_endpoint_dir_out(epd) || !usb_endpoint_xfer_bulk(epd)) {
1976                 snd_printdd(KERN_ERR "endpoint[2] isn't bulk output\n");
1977                 return -ENXIO;
1978         }
1979         if (endpoint->out_cables > 0x0001) {
1980                 epd = get_endpoint(hostif, 4);
1981                 if (!usb_endpoint_dir_out(epd) ||
1982                     !usb_endpoint_xfer_bulk(epd)) {
1983                         snd_printdd(KERN_ERR "endpoint[4] isn't bulk output\n");
1984                         return -ENXIO;
1985                 }
1986         }
1987
1988         ep_info.out_ep = get_endpoint(hostif, 2)->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
1989         ep_info.out_interval = 0;
1990         ep_info.out_cables = endpoint->out_cables & 0x5555;
1991         err = snd_usbmidi_out_endpoint_create(umidi, &ep_info, &umidi->endpoints[0]);
1992         if (err < 0)
1993                 return err;
1994
1995         ep_info.in_ep = get_endpoint(hostif, 0)->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
1996         ep_info.in_interval = get_endpoint(hostif, 0)->bInterval;
1997         ep_info.in_cables = endpoint->in_cables;
1998         err = snd_usbmidi_in_endpoint_create(umidi, &ep_info, &umidi->endpoints[0]);
1999         if (err < 0)
2000                 return err;
2001
2002         if (endpoint->out_cables > 0x0001) {
2003                 ep_info.out_ep = get_endpoint(hostif, 4)->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
2004                 ep_info.out_cables = endpoint->out_cables & 0xaaaa;
2005                 err = snd_usbmidi_out_endpoint_create(umidi, &ep_info, &umidi->endpoints[1]);
2006                 if (err < 0)
2007                         return err;
2008         }
2009
2010         for (cable = 0; cable < 0x10; ++cable) {
2011                 if (endpoint->out_cables & (1 << cable))
2012                         snd_usbmidi_init_substream(umidi, SNDRV_RAWMIDI_STREAM_OUTPUT, cable,
2013                                                    &umidi->endpoints[cable & 1].out->ports[cable].substream);
2014                 if (endpoint->in_cables & (1 << cable))
2015                         snd_usbmidi_init_substream(umidi, SNDRV_RAWMIDI_STREAM_INPUT, cable,
2016                                                    &umidi->endpoints[0].in->ports[cable].substream);
2017         }
2018         return 0;
2019 }
2020
2021 static struct snd_rawmidi_global_ops snd_usbmidi_ops = {
2022         .get_port_info = snd_usbmidi_get_port_info,
2023 };
2024
2025 static int snd_usbmidi_create_rawmidi(struct snd_usb_midi* umidi,
2026                                       int out_ports, int in_ports)
2027 {
2028         struct snd_rawmidi *rmidi;
2029         int err;
2030
2031         err = snd_rawmidi_new(umidi->card, "USB MIDI",
2032                               umidi->next_midi_device++,
2033                               out_ports, in_ports, &rmidi);
2034         if (err < 0)
2035                 return err;
2036         strcpy(rmidi->name, umidi->card->shortname);
2037         rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
2038                             SNDRV_RAWMIDI_INFO_INPUT |
2039                             SNDRV_RAWMIDI_INFO_DUPLEX;
2040         rmidi->ops = &snd_usbmidi_ops;
2041         rmidi->private_data = umidi;
2042         rmidi->private_free = snd_usbmidi_rawmidi_free;
2043         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_usbmidi_output_ops);
2044         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_usbmidi_input_ops);
2045
2046         umidi->rmidi = rmidi;
2047         return 0;
2048 }
2049
2050 /*
2051  * Temporarily stop input.
2052  */
2053 void snd_usbmidi_input_stop(struct list_head* p)
2054 {
2055         struct snd_usb_midi* umidi;
2056         unsigned int i, j;
2057
2058         umidi = list_entry(p, struct snd_usb_midi, list);
2059         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
2060                 struct snd_usb_midi_endpoint* ep = &umidi->endpoints[i];
2061                 if (ep->in)
2062                         for (j = 0; j < INPUT_URBS; ++j)
2063                                 usb_kill_urb(ep->in->urbs[j]);
2064         }
2065 }
2066
2067 static void snd_usbmidi_input_start_ep(struct snd_usb_midi_in_endpoint* ep)
2068 {
2069         unsigned int i;
2070
2071         if (!ep)
2072                 return;
2073         for (i = 0; i < INPUT_URBS; ++i) {
2074                 struct urb* urb = ep->urbs[i];
2075                 urb->dev = ep->umidi->dev;
2076                 snd_usbmidi_submit_urb(urb, GFP_KERNEL);
2077         }
2078 }
2079
2080 /*
2081  * Resume input after a call to snd_usbmidi_input_stop().
2082  */
2083 void snd_usbmidi_input_start(struct list_head* p)
2084 {
2085         struct snd_usb_midi* umidi;
2086         int i;
2087
2088         umidi = list_entry(p, struct snd_usb_midi, list);
2089         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
2090                 snd_usbmidi_input_start_ep(umidi->endpoints[i].in);
2091 }
2092
2093 /*
2094  * Creates and registers everything needed for a MIDI streaming interface.
2095  */
2096 int snd_usbmidi_create(struct snd_card *card,
2097                        struct usb_interface* iface,
2098                        struct list_head *midi_list,
2099                        const struct snd_usb_audio_quirk* quirk)
2100 {
2101         struct snd_usb_midi* umidi;
2102         struct snd_usb_midi_endpoint_info endpoints[MIDI_MAX_ENDPOINTS];
2103         int out_ports, in_ports;
2104         int i, err;
2105
2106         umidi = kzalloc(sizeof(*umidi), GFP_KERNEL);
2107         if (!umidi)
2108                 return -ENOMEM;
2109         umidi->dev = interface_to_usbdev(iface);
2110         umidi->card = card;
2111         umidi->iface = iface;
2112         umidi->quirk = quirk;
2113         umidi->usb_protocol_ops = &snd_usbmidi_standard_ops;
2114         init_timer(&umidi->error_timer);
2115         spin_lock_init(&umidi->disc_lock);
2116         mutex_init(&umidi->mutex);
2117         umidi->usb_id = USB_ID(le16_to_cpu(umidi->dev->descriptor.idVendor),
2118                                le16_to_cpu(umidi->dev->descriptor.idProduct));
2119         umidi->error_timer.function = snd_usbmidi_error_timer;
2120         umidi->error_timer.data = (unsigned long)umidi;
2121
2122         /* detect the endpoint(s) to use */
2123         memset(endpoints, 0, sizeof(endpoints));
2124         switch (quirk ? quirk->type : QUIRK_MIDI_STANDARD_INTERFACE) {
2125         case QUIRK_MIDI_STANDARD_INTERFACE:
2126                 err = snd_usbmidi_get_ms_info(umidi, endpoints);
2127                 if (umidi->usb_id == USB_ID(0x0763, 0x0150)) /* M-Audio Uno */
2128                         umidi->usb_protocol_ops =
2129                                 &snd_usbmidi_maudio_broken_running_status_ops;
2130                 break;
2131         case QUIRK_MIDI_US122L:
2132                 umidi->usb_protocol_ops = &snd_usbmidi_122l_ops;
2133                 /* fall through */
2134         case QUIRK_MIDI_FIXED_ENDPOINT:
2135                 memcpy(&endpoints[0], quirk->data,
2136                        sizeof(struct snd_usb_midi_endpoint_info));
2137                 err = snd_usbmidi_detect_endpoints(umidi, &endpoints[0], 1);
2138                 break;
2139         case QUIRK_MIDI_YAMAHA:
2140                 err = snd_usbmidi_detect_yamaha(umidi, &endpoints[0]);
2141                 break;
2142         case QUIRK_MIDI_MIDIMAN:
2143                 umidi->usb_protocol_ops = &snd_usbmidi_midiman_ops;
2144                 memcpy(&endpoints[0], quirk->data,
2145                        sizeof(struct snd_usb_midi_endpoint_info));
2146                 err = 0;
2147                 break;
2148         case QUIRK_MIDI_NOVATION:
2149                 umidi->usb_protocol_ops = &snd_usbmidi_novation_ops;
2150                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2151                 break;
2152         case QUIRK_MIDI_RAW_BYTES:
2153                 umidi->usb_protocol_ops = &snd_usbmidi_raw_ops;
2154                 /*
2155                  * Interface 1 contains isochronous endpoints, but with the same
2156                  * numbers as in interface 0.  Since it is interface 1 that the
2157                  * USB core has most recently seen, these descriptors are now
2158                  * associated with the endpoint numbers.  This will foul up our
2159                  * attempts to submit bulk/interrupt URBs to the endpoints in
2160                  * interface 0, so we have to make sure that the USB core looks
2161                  * again at interface 0 by calling usb_set_interface() on it.
2162                  */
2163                 if (umidi->usb_id == USB_ID(0x07fd, 0x0001)) /* MOTU Fastlane */
2164                         usb_set_interface(umidi->dev, 0, 0);
2165                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2166                 break;
2167         case QUIRK_MIDI_EMAGIC:
2168                 umidi->usb_protocol_ops = &snd_usbmidi_emagic_ops;
2169                 memcpy(&endpoints[0], quirk->data,
2170                        sizeof(struct snd_usb_midi_endpoint_info));
2171                 err = snd_usbmidi_detect_endpoints(umidi, &endpoints[0], 1);
2172                 break;
2173         case QUIRK_MIDI_CME:
2174                 umidi->usb_protocol_ops = &snd_usbmidi_cme_ops;
2175                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2176                 break;
2177         case QUIRK_MIDI_AKAI:
2178                 umidi->usb_protocol_ops = &snd_usbmidi_akai_ops;
2179                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2180                 /* endpoint 1 is input-only */
2181                 endpoints[1].out_cables = 0;
2182                 break;
2183         case QUIRK_MIDI_FTDI:
2184                 umidi->usb_protocol_ops = &snd_usbmidi_ftdi_ops;
2185
2186                 /* set baud rate to 31250 (48 MHz / 16 / 96) */
2187                 err = usb_control_msg(umidi->dev, usb_sndctrlpipe(umidi->dev, 0),
2188                                       3, 0x40, 0x60, 0, NULL, 0, 1000);
2189                 if (err < 0)
2190                         break;
2191
2192                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2193                 break;
2194         default:
2195                 snd_printd(KERN_ERR "invalid quirk type %d\n", quirk->type);
2196                 err = -ENXIO;
2197                 break;
2198         }
2199         if (err < 0) {
2200                 kfree(umidi);
2201                 return err;
2202         }
2203
2204         /* create rawmidi device */
2205         out_ports = 0;
2206         in_ports = 0;
2207         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
2208                 out_ports += hweight16(endpoints[i].out_cables);
2209                 in_ports += hweight16(endpoints[i].in_cables);
2210         }
2211         err = snd_usbmidi_create_rawmidi(umidi, out_ports, in_ports);
2212         if (err < 0) {
2213                 kfree(umidi);
2214                 return err;
2215         }
2216
2217         /* create endpoint/port structures */
2218         if (quirk && quirk->type == QUIRK_MIDI_MIDIMAN)
2219                 err = snd_usbmidi_create_endpoints_midiman(umidi, &endpoints[0]);
2220         else
2221                 err = snd_usbmidi_create_endpoints(umidi, endpoints);
2222         if (err < 0) {
2223                 snd_usbmidi_free(umidi);
2224                 return err;
2225         }
2226
2227         list_add_tail(&umidi->list, midi_list);
2228
2229         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
2230                 snd_usbmidi_input_start_ep(umidi->endpoints[i].in);
2231         return 0;
2232 }
2233
2234 EXPORT_SYMBOL(snd_usbmidi_create);
2235 EXPORT_SYMBOL(snd_usbmidi_input_stop);
2236 EXPORT_SYMBOL(snd_usbmidi_input_start);
2237 EXPORT_SYMBOL(snd_usbmidi_disconnect);