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                 bool autopm_reference;
 152                 uint8_t cable;          /* cable number << 4 */
 153                 uint8_t state;
 154 #define STATE_UNKNOWN   0
 155 #define STATE_1PARAM    1
 156 #define STATE_2PARAM_1  2
 157 #define STATE_2PARAM_2  3
 158 #define STATE_SYSEX_0   4
 159 #define STATE_SYSEX_1   5
 160 #define STATE_SYSEX_2   6
 161                 uint8_t data[2];
 162         } ports[0x10];
 163         int current_port;
 164
 165         wait_queue_head_t drain_wait;
 166 };
 167
 168 struct snd_usb_midi_in_endpoint {
 169         struct snd_usb_midi* umidi;
 170         struct urb* urbs[INPUT_URBS];
 171         struct usbmidi_in_port {
 172                 struct snd_rawmidi_substream *substream;
 173                 u8 running_status_length;
 174         } ports[0x10];
 175         u8 seen_f5;
 176         u8 error_resubmit;
 177         int current_port;
 178 };
 179
 180 static void snd_usbmidi_do_output(struct snd_usb_midi_out_endpoint* ep);
 181
 182 static const uint8_t snd_usbmidi_cin_length[] = {
 183         0, 0, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 2, 2, 3, 1
 184 };
 185
 186 /*
 187  * Submits the URB, with error handling.
 188  */
 189 static int snd_usbmidi_submit_urb(struct urb* urb, gfp_t flags)
 190 {
 191         int err = usb_submit_urb(urb, flags);
 192         if (err < 0 && err != -ENODEV)
 193                 snd_printk(KERN_ERR "usb_submit_urb: %d\n", err);
 194         return err;
 195 }
 196
 197 /*
 198  * Error handling for URB completion functions.
 199  */
 200 static int snd_usbmidi_urb_error(int status)
 201 {
 202         switch (status) {
 203         /* manually unlinked, or device gone */
 204         case -ENOENT:
 205         case -ECONNRESET:
 206         case -ESHUTDOWN:
 207         case -ENODEV:
 208                 return -ENODEV;
 209         /* errors that might occur during unplugging */
 210         case -EPROTO:
 211         case -ETIME:
 212         case -EILSEQ:
 213                 return -EIO;
 214         default:
 215                 snd_printk(KERN_ERR "urb status %d\n", status);
 216                 return 0; /* continue */
 217         }
 218 }
 219
 220 /*
 221  * Receives a chunk of MIDI data.
 222  */
 223 static void snd_usbmidi_input_data(struct snd_usb_midi_in_endpoint* ep, int portidx,
 224                                    uint8_t* data, int length)
 225 {
 226         struct usbmidi_in_port* port = &ep->ports[portidx];
 227
 228         if (!port->substream) {
 229                 snd_printd("unexpected port %d!\n", portidx);
 230                 return;
 231         }
 232         if (!test_bit(port->substream->number, &ep->umidi->input_triggered))
 233                 return;
 234         snd_rawmidi_receive(port->substream, data, length);
 235 }
 236
 237 #ifdef DUMP_PACKETS
 238 static void dump_urb(const char *type, const u8 *data, int length)
 239 {
 240         snd_printk(KERN_DEBUG "%s packet: [", type);
 241         for (; length > 0; ++data, --length)
 242                 printk(" %02x", *data);
 243         printk(" ]\n");
 244 }
 245 #else
 246 #define dump_urb(type, data, length) /* nothing */
 247 #endif
 248
 249 /*
 250  * Processes the data read from the device.
 251  */
 252 static void snd_usbmidi_in_urb_complete(struct urb* urb)
 253 {
 254         struct snd_usb_midi_in_endpoint* ep = urb->context;
 255
 256         if (urb->status == 0) {
 257                 dump_urb("received", urb->transfer_buffer, urb->actual_length);
 258                 ep->umidi->usb_protocol_ops->input(ep, urb->transfer_buffer,
 259                                                    urb->actual_length);
 260         } else {
 261                 int err = snd_usbmidi_urb_error(urb->status);
 262                 if (err < 0) {
 263                         if (err != -ENODEV) {
 264                                 ep->error_resubmit = 1;
 265                                 mod_timer(&ep->umidi->error_timer,
 266                                           jiffies + ERROR_DELAY_JIFFIES);
 267                         }
 268                         return;
 269                 }
 270         }
 271
 272         urb->dev = ep->umidi->dev;
 273         snd_usbmidi_submit_urb(urb, GFP_ATOMIC);
 274 }
 275
 276 static void snd_usbmidi_out_urb_complete(struct urb* urb)
 277 {
 278         struct out_urb_context *context = urb->context;
 279         struct snd_usb_midi_out_endpoint* ep = context->ep;
 280         unsigned int urb_index;
 281
 282         spin_lock(&ep->buffer_lock);
 283         urb_index = context - ep->urbs;
 284         ep->active_urbs &= ~(1 << urb_index);
 285         if (unlikely(ep->drain_urbs)) {
 286                 ep->drain_urbs &= ~(1 << urb_index);
 287                 wake_up(&ep->drain_wait);
 288         }
 289         spin_unlock(&ep->buffer_lock);
 290         if (urb->status < 0) {
 291                 int err = snd_usbmidi_urb_error(urb->status);
 292                 if (err < 0) {
 293                         if (err != -ENODEV)
 294                                 mod_timer(&ep->umidi->error_timer,
 295                                           jiffies + ERROR_DELAY_JIFFIES);
 296                         return;
 297                 }
 298         }
 299         snd_usbmidi_do_output(ep);
 300 }
 301
 302 /*
 303  * This is called when some data should be transferred to the device
 304  * (from one or more substreams).
 305  */
 306 static void snd_usbmidi_do_output(struct snd_usb_midi_out_endpoint* ep)
 307 {
 308         unsigned int urb_index;
 309         struct urb* urb;
 310         unsigned long flags;
 311
 312         spin_lock_irqsave(&ep->buffer_lock, flags);
 313         if (ep->umidi->disconnected) {
 314                 spin_unlock_irqrestore(&ep->buffer_lock, flags);
 315                 return;
 316         }
 317
 318         urb_index = ep->next_urb;
 319         for (;;) {
 320                 if (!(ep->active_urbs & (1 << urb_index))) {
 321                         urb = ep->urbs[urb_index].urb;
 322                         urb->transfer_buffer_length = 0;
 323                         ep->umidi->usb_protocol_ops->output(ep, urb);
 324                         if (urb->transfer_buffer_length == 0)
 325                                 break;
 326
 327                         dump_urb("sending", urb->transfer_buffer,
 328                                  urb->transfer_buffer_length);
 329                         urb->dev = ep->umidi->dev;
 330                         if (snd_usbmidi_submit_urb(urb, GFP_ATOMIC) < 0)
 331                                 break;
 332                         ep->active_urbs |= 1 << urb_index;
 333                 }
 334                 if (++urb_index >= OUTPUT_URBS)
 335                         urb_index = 0;
 336                 if (urb_index == ep->next_urb)
 337                         break;
 338         }
 339         ep->next_urb = urb_index;
 340         spin_unlock_irqrestore(&ep->buffer_lock, flags);
 341 }
 342
 343 static void snd_usbmidi_out_tasklet(unsigned long data)
 344 {
 345         struct snd_usb_midi_out_endpoint* ep = (struct snd_usb_midi_out_endpoint *) data;
 346
 347         snd_usbmidi_do_output(ep);
 348 }
 349
 350 /* called after transfers had been interrupted due to some USB error */
 351 static void snd_usbmidi_error_timer(unsigned long data)
 352 {
 353         struct snd_usb_midi *umidi = (struct snd_usb_midi *)data;
 354         unsigned int i, j;
 355
 356         spin_lock(&umidi->disc_lock);
 357         if (umidi->disconnected) {
 358                 spin_unlock(&umidi->disc_lock);
 359                 return;
 360         }
 361         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
 362                 struct snd_usb_midi_in_endpoint *in = umidi->endpoints[i].in;
 363                 if (in && in->error_resubmit) {
 364                         in->error_resubmit = 0;
 365                         for (j = 0; j < INPUT_URBS; ++j) {
 366                                 in->urbs[j]->dev = umidi->dev;
 367                                 snd_usbmidi_submit_urb(in->urbs[j], GFP_ATOMIC);
 368                         }
 369                 }
 370                 if (umidi->endpoints[i].out)
 371                         snd_usbmidi_do_output(umidi->endpoints[i].out);
 372         }
 373         spin_unlock(&umidi->disc_lock);
 374 }
 375
 376 /* helper function to send static data that may not DMA-able */
 377 static int send_bulk_static_data(struct snd_usb_midi_out_endpoint* ep,
 378                                  const void *data, int len)
 379 {
 380         int err = 0;
 381         void *buf = kmemdup(data, len, GFP_KERNEL);
 382         if (!buf)
 383                 return -ENOMEM;
 384         dump_urb("sending", buf, len);
 385         if (ep->urbs[0].urb)
 386                 err = usb_bulk_msg(ep->umidi->dev, ep->urbs[0].urb->pipe,
 387                                    buf, len, NULL, 250);
 388         kfree(buf);
 389         return err;
 390 }
 391
 392 /*
 393  * Standard USB MIDI protocol: see the spec.
 394  * Midiman protocol: like the standard protocol, but the control byte is the
 395  * fourth byte in each packet, and uses length instead of CIN.
 396  */
 397
 398 static void snd_usbmidi_standard_input(struct snd_usb_midi_in_endpoint* ep,
 399                                        uint8_t* buffer, int buffer_length)
 400 {
 401         int i;
 402
 403         for (i = 0; i + 3 < buffer_length; i += 4)
 404                 if (buffer[i] != 0) {
 405                         int cable = buffer[i] >> 4;
 406                         int length = snd_usbmidi_cin_length[buffer[i] & 0x0f];
 407                         snd_usbmidi_input_data(ep, cable, &buffer[i + 1], length);
 408                 }
 409 }
 410
 411 static void snd_usbmidi_midiman_input(struct snd_usb_midi_in_endpoint* ep,
 412                                       uint8_t* buffer, int buffer_length)
 413 {
 414         int i;
 415
 416         for (i = 0; i + 3 < buffer_length; i += 4)
 417                 if (buffer[i + 3] != 0) {
 418                         int port = buffer[i + 3] >> 4;
 419                         int length = buffer[i + 3] & 3;
 420                         snd_usbmidi_input_data(ep, port, &buffer[i], length);
 421                 }
 422 }
 423
 424 /*
 425  * Buggy M-Audio device: running status on input results in a packet that has
 426  * the data bytes but not the status byte and that is marked with CIN 4.
 427  */
 428 static void snd_usbmidi_maudio_broken_running_status_input(
 429                                         struct snd_usb_midi_in_endpoint* ep,
 430                                         uint8_t* buffer, int buffer_length)
 431 {
 432         int i;
 433
 434         for (i = 0; i + 3 < buffer_length; i += 4)
 435                 if (buffer[i] != 0) {
 436                         int cable = buffer[i] >> 4;
 437                         u8 cin = buffer[i] & 0x0f;
 438                         struct usbmidi_in_port *port = &ep->ports[cable];
 439                         int length;
 440
 441                         length = snd_usbmidi_cin_length[cin];
 442                         if (cin == 0xf && buffer[i + 1] >= 0xf8)
 443                                 ; /* realtime msg: no running status change */
 444                         else if (cin >= 0x8 && cin <= 0xe)
 445                                 /* channel msg */
 446                                 port->running_status_length = length - 1;
 447                         else if (cin == 0x4 &&
 448                                  port->running_status_length != 0 &&
 449                                  buffer[i + 1] < 0x80)
 450                                 /* CIN 4 that is not a SysEx */
 451                                 length = port->running_status_length;
 452                         else
 453                                 /*
 454                                  * All other msgs cannot begin running status.
 455                                  * (A channel msg sent as two or three CIN 0xF
 456                                  * packets could in theory, but this device
 457                                  * doesn't use this format.)
 458                                  */
 459                                 port->running_status_length = 0;
 460                         snd_usbmidi_input_data(ep, cable, &buffer[i + 1], length);
 461                 }
 462 }
 463
 464 /*
 465  * CME protocol: like the standard protocol, but SysEx commands are sent as a
 466  * single USB packet preceded by a 0x0F byte.
 467  */
 468 static void snd_usbmidi_cme_input(struct snd_usb_midi_in_endpoint *ep,
 469                                   uint8_t *buffer, int buffer_length)
 470 {
 471         if (buffer_length < 2 || (buffer[0] & 0x0f) != 0x0f)
 472                 snd_usbmidi_standard_input(ep, buffer, buffer_length);
 473         else
 474                 snd_usbmidi_input_data(ep, buffer[0] >> 4,
 475                                        &buffer[1], buffer_length - 1);
 476 }
 477
 478 /*
 479  * Adds one USB MIDI packet to the output buffer.
 480  */
 481 static void snd_usbmidi_output_standard_packet(struct urb* urb, uint8_t p0,
 482                                                uint8_t p1, uint8_t p2, uint8_t p3)
 483 {
 484
 485         uint8_t* buf = (uint8_t*)urb->transfer_buffer + urb->transfer_buffer_length;
 486         buf[0] = p0;
 487         buf[1] = p1;
 488         buf[2] = p2;
 489         buf[3] = p3;
 490         urb->transfer_buffer_length += 4;
 491 }
 492
 493 /*
 494  * Adds one Midiman packet to the output buffer.
 495  */
 496 static void snd_usbmidi_output_midiman_packet(struct urb* urb, uint8_t p0,
 497                                               uint8_t p1, uint8_t p2, uint8_t p3)
 498 {
 499
 500         uint8_t* buf = (uint8_t*)urb->transfer_buffer + urb->transfer_buffer_length;
 501         buf[0] = p1;
 502         buf[1] = p2;
 503         buf[2] = p3;
 504         buf[3] = (p0 & 0xf0) | snd_usbmidi_cin_length[p0 & 0x0f];
 505         urb->transfer_buffer_length += 4;
 506 }
 507
 508 /*
 509  * Converts MIDI commands to USB MIDI packets.
 510  */
 511 static void snd_usbmidi_transmit_byte(struct usbmidi_out_port* port,
 512                                       uint8_t b, struct urb* urb)
 513 {
 514         uint8_t p0 = port->cable;
 515         void (*output_packet)(struct urb*, uint8_t, uint8_t, uint8_t, uint8_t) =
 516                 port->ep->umidi->usb_protocol_ops->output_packet;
 517
 518         if (b >= 0xf8) {
 519                 output_packet(urb, p0 | 0x0f, b, 0, 0);
 520         } else if (b >= 0xf0) {
 521                 switch (b) {
 522                 case 0xf0:
 523                         port->data[0] = b;
 524                         port->state = STATE_SYSEX_1;
 525                         break;
 526                 case 0xf1:
 527                 case 0xf3:
 528                         port->data[0] = b;
 529                         port->state = STATE_1PARAM;
 530                         break;
 531                 case 0xf2:
 532                         port->data[0] = b;
 533                         port->state = STATE_2PARAM_1;
 534                         break;
 535                 case 0xf4:
 536                 case 0xf5:
 537                         port->state = STATE_UNKNOWN;
 538                         break;
 539                 case 0xf6:
 540                         output_packet(urb, p0 | 0x05, 0xf6, 0, 0);
 541                         port->state = STATE_UNKNOWN;
 542                         break;
 543                 case 0xf7:
 544                         switch (port->state) {
 545                         case STATE_SYSEX_0:
 546                                 output_packet(urb, p0 | 0x05, 0xf7, 0, 0);
 547                                 break;
 548                         case STATE_SYSEX_1:
 549                                 output_packet(urb, p0 | 0x06, port->data[0], 0xf7, 0);
 550                                 break;
 551                         case STATE_SYSEX_2:
 552                                 output_packet(urb, p0 | 0x07, port->data[0], port->data[1], 0xf7);
 553                                 break;
 554                         }
 555                         port->state = STATE_UNKNOWN;
 556                         break;
 557                 }
 558         } else if (b >= 0x80) {
 559                 port->data[0] = b;
 560                 if (b >= 0xc0 && b <= 0xdf)
 561                         port->state = STATE_1PARAM;
 562                 else
 563                         port->state = STATE_2PARAM_1;
 564         } else { /* b < 0x80 */
 565                 switch (port->state) {
 566                 case STATE_1PARAM:
 567                         if (port->data[0] < 0xf0) {
 568                                 p0 |= port->data[0] >> 4;
 569                         } else {
 570                                 p0 |= 0x02;
 571                                 port->state = STATE_UNKNOWN;
 572                         }
 573                         output_packet(urb, p0, port->data[0], b, 0);
 574                         break;
 575                 case STATE_2PARAM_1:
 576                         port->data[1] = b;
 577                         port->state = STATE_2PARAM_2;
 578                         break;
 579                 case STATE_2PARAM_2:
 580                         if (port->data[0] < 0xf0) {
 581                                 p0 |= port->data[0] >> 4;
 582                                 port->state = STATE_2PARAM_1;
 583                         } else {
 584                                 p0 |= 0x03;
 585                                 port->state = STATE_UNKNOWN;
 586                         }
 587                         output_packet(urb, p0, port->data[0], port->data[1], b);
 588                         break;
 589                 case STATE_SYSEX_0:
 590                         port->data[0] = b;
 591                         port->state = STATE_SYSEX_1;
 592                         break;
 593                 case STATE_SYSEX_1:
 594                         port->data[1] = b;
 595                         port->state = STATE_SYSEX_2;
 596                         break;
 597                 case STATE_SYSEX_2:
 598                         output_packet(urb, p0 | 0x04, port->data[0], port->data[1], b);
 599                         port->state = STATE_SYSEX_0;
 600                         break;
 601                 }
 602         }
 603 }
 604
 605 static void snd_usbmidi_standard_output(struct snd_usb_midi_out_endpoint* ep,
 606                                         struct urb *urb)
 607 {
 608         int p;
 609
 610         /* FIXME: lower-numbered ports can starve higher-numbered ports */
 611         for (p = 0; p < 0x10; ++p) {
 612                 struct usbmidi_out_port* port = &ep->ports[p];
 613                 if (!port->active)
 614                         continue;
 615                 while (urb->transfer_buffer_length + 3 < ep->max_transfer) {
 616                         uint8_t b;
 617                         if (snd_rawmidi_transmit(port->substream, &b, 1) != 1) {
 618                                 port->active = 0;
 619                                 break;
 620                         }
 621                         snd_usbmidi_transmit_byte(port, b, urb);
 622                 }
 623         }
 624 }
 625
 626 static struct usb_protocol_ops snd_usbmidi_standard_ops = {
 627         .input = snd_usbmidi_standard_input,
 628         .output = snd_usbmidi_standard_output,
 629         .output_packet = snd_usbmidi_output_standard_packet,
 630 };
 631
 632 static struct usb_protocol_ops snd_usbmidi_midiman_ops = {
 633         .input = snd_usbmidi_midiman_input,
 634         .output = snd_usbmidi_standard_output,
 635         .output_packet = snd_usbmidi_output_midiman_packet,
 636 };
 637
 638 static struct usb_protocol_ops snd_usbmidi_maudio_broken_running_status_ops = {
 639         .input = snd_usbmidi_maudio_broken_running_status_input,
 640         .output = snd_usbmidi_standard_output,
 641         .output_packet = snd_usbmidi_output_standard_packet,
 642 };
 643
 644 static struct usb_protocol_ops snd_usbmidi_cme_ops = {
 645         .input = snd_usbmidi_cme_input,
 646         .output = snd_usbmidi_standard_output,
 647         .output_packet = snd_usbmidi_output_standard_packet,
 648 };
 649
 650 /*
 651  * AKAI MPD16 protocol:
 652  *
 653  * For control port (endpoint 1):
 654  * ==============================
 655  * One or more chunks consisting of first byte of (0x10 | msg_len) and then a
 656  * SysEx message (msg_len=9 bytes long).
 657  *
 658  * For data port (endpoint 2):
 659  * ===========================
 660  * One or more chunks consisting of first byte of (0x20 | msg_len) and then a
 661  * MIDI message (msg_len bytes long)
 662  *
 663  * Messages sent: Active Sense, Note On, Poly Pressure, Control Change.
 664  */
 665 static void snd_usbmidi_akai_input(struct snd_usb_midi_in_endpoint *ep,
 666                                    uint8_t *buffer, int buffer_length)
 667 {
 668         unsigned int pos = 0;
 669         unsigned int len = (unsigned int)buffer_length;
 670         while (pos < len) {
 671                 unsigned int port = (buffer[pos] >> 4) - 1;
 672                 unsigned int msg_len = buffer[pos] & 0x0f;
 673                 pos++;
 674                 if (pos + msg_len <= len && port < 2)
 675                         snd_usbmidi_input_data(ep, 0, &buffer[pos], msg_len);
 676                 pos += msg_len;
 677         }
 678 }
 679
 680 #define MAX_AKAI_SYSEX_LEN 9
 681
 682 static void snd_usbmidi_akai_output(struct snd_usb_midi_out_endpoint *ep,
 683                                     struct urb *urb)
 684 {
 685         uint8_t *msg;
 686         int pos, end, count, buf_end;
 687         uint8_t tmp[MAX_AKAI_SYSEX_LEN];
 688         struct snd_rawmidi_substream *substream = ep->ports[0].substream;
 689
 690         if (!ep->ports[0].active)
 691                 return;
 692
 693         msg = urb->transfer_buffer + urb->transfer_buffer_length;
 694         buf_end = ep->max_transfer - MAX_AKAI_SYSEX_LEN - 1;
 695
 696         /* only try adding more data when there's space for at least 1 SysEx */
 697         while (urb->transfer_buffer_length < buf_end) {
 698                 count = snd_rawmidi_transmit_peek(substream,
 699                                                   tmp, MAX_AKAI_SYSEX_LEN);
 700                 if (!count) {
 701                         ep->ports[0].active = 0;
 702                         return;
 703                 }
 704                 /* try to skip non-SysEx data */
 705                 for (pos = 0; pos < count && tmp[pos] != 0xF0; pos++)
 706                         ;
 707
 708                 if (pos > 0) {
 709                         snd_rawmidi_transmit_ack(substream, pos);
 710                         continue;
 711                 }
 712
 713                 /* look for the start or end marker */
 714                 for (end = 1; end < count && tmp[end] < 0xF0; end++)
 715                         ;
 716
 717                 /* next SysEx started before the end of current one */
 718                 if (end < count && tmp[end] == 0xF0) {
 719                         /* it's incomplete - drop it */
 720                         snd_rawmidi_transmit_ack(substream, end);
 721                         continue;
 722                 }
 723                 /* SysEx complete */
 724                 if (end < count && tmp[end] == 0xF7) {
 725                         /* queue it, ack it, and get the next one */
 726                         count = end + 1;
 727                         msg[0] = 0x10 | count;
 728                         memcpy(&msg[1], tmp, count);
 729                         snd_rawmidi_transmit_ack(substream, count);
 730                         urb->transfer_buffer_length += count + 1;
 731                         msg += count + 1;
 732                         continue;
 733                 }
 734                 /* less than 9 bytes and no end byte - wait for more */
 735                 if (count < MAX_AKAI_SYSEX_LEN) {
 736                         ep->ports[0].active = 0;
 737                         return;
 738                 }
 739                 /* 9 bytes and no end marker in sight - malformed, skip it */
 740                 snd_rawmidi_transmit_ack(substream, count);
 741         }
 742 }
 743
 744 static struct usb_protocol_ops snd_usbmidi_akai_ops = {
 745         .input = snd_usbmidi_akai_input,
 746         .output = snd_usbmidi_akai_output,
 747 };
 748
 749 /*
 750  * Novation USB MIDI protocol: number of data bytes is in the first byte
 751  * (when receiving) (+1!) or in the second byte (when sending); data begins
 752  * at the third byte.
 753  */
 754
 755 static void snd_usbmidi_novation_input(struct snd_usb_midi_in_endpoint* ep,
 756                                        uint8_t* buffer, int buffer_length)
 757 {
 758         if (buffer_length < 2 || !buffer[0] || buffer_length < buffer[0] + 1)
 759                 return;
 760         snd_usbmidi_input_data(ep, 0, &buffer[2], buffer[0] - 1);
 761 }
 762
 763 static void snd_usbmidi_novation_output(struct snd_usb_midi_out_endpoint* ep,
 764                                         struct urb *urb)
 765 {
 766         uint8_t* transfer_buffer;
 767         int count;
 768
 769         if (!ep->ports[0].active)
 770                 return;
 771         transfer_buffer = urb->transfer_buffer;
 772         count = snd_rawmidi_transmit(ep->ports[0].substream,
 773                                      &transfer_buffer[2],
 774                                      ep->max_transfer - 2);
 775         if (count < 1) {
 776                 ep->ports[0].active = 0;
 777                 return;
 778         }
 779         transfer_buffer[0] = 0;
 780         transfer_buffer[1] = count;
 781         urb->transfer_buffer_length = 2 + count;
 782 }
 783
 784 static struct usb_protocol_ops snd_usbmidi_novation_ops = {
 785         .input = snd_usbmidi_novation_input,
 786         .output = snd_usbmidi_novation_output,
 787 };
 788
 789 /*
 790  * "raw" protocol: just move raw MIDI bytes from/to the endpoint
 791  */
 792
 793 static void snd_usbmidi_raw_input(struct snd_usb_midi_in_endpoint* ep,
 794                                   uint8_t* buffer, int buffer_length)
 795 {
 796         snd_usbmidi_input_data(ep, 0, buffer, buffer_length);
 797 }
 798
 799 static void snd_usbmidi_raw_output(struct snd_usb_midi_out_endpoint* ep,
 800                                    struct urb *urb)
 801 {
 802         int count;
 803
 804         if (!ep->ports[0].active)
 805                 return;
 806         count = snd_rawmidi_transmit(ep->ports[0].substream,
 807                                      urb->transfer_buffer,
 808                                      ep->max_transfer);
 809         if (count < 1) {
 810                 ep->ports[0].active = 0;
 811                 return;
 812         }
 813         urb->transfer_buffer_length = count;
 814 }
 815
 816 static struct usb_protocol_ops snd_usbmidi_raw_ops = {
 817         .input = snd_usbmidi_raw_input,
 818         .output = snd_usbmidi_raw_output,
 819 };
 820
 821 /*
 822  * FTDI protocol: raw MIDI bytes, but input packets have two modem status bytes.
 823  */
 824
 825 static void snd_usbmidi_ftdi_input(struct snd_usb_midi_in_endpoint* ep,
 826                                    uint8_t* buffer, int buffer_length)
 827 {
 828         if (buffer_length > 2)
 829                 snd_usbmidi_input_data(ep, 0, buffer + 2, buffer_length - 2);
 830 }
 831
 832 static struct usb_protocol_ops snd_usbmidi_ftdi_ops = {
 833         .input = snd_usbmidi_ftdi_input,
 834         .output = snd_usbmidi_raw_output,
 835 };
 836
 837 static void snd_usbmidi_us122l_input(struct snd_usb_midi_in_endpoint *ep,
 838                                      uint8_t *buffer, int buffer_length)
 839 {
 840         if (buffer_length != 9)
 841                 return;
 842         buffer_length = 8;
 843         while (buffer_length && buffer[buffer_length - 1] == 0xFD)
 844                 buffer_length--;
 845         if (buffer_length)
 846                 snd_usbmidi_input_data(ep, 0, buffer, buffer_length);
 847 }
 848
 849 static void snd_usbmidi_us122l_output(struct snd_usb_midi_out_endpoint *ep,
 850                                       struct urb *urb)
 851 {
 852         int count;
 853
 854         if (!ep->ports[0].active)
 855                 return;
 856         switch (snd_usb_get_speed(ep->umidi->dev)) {
 857         case USB_SPEED_HIGH:
 858         case USB_SPEED_SUPER:
 859                 count = 1;
 860                 break;
 861         default:
 862                 count = 2;
 863         }
 864         count = snd_rawmidi_transmit(ep->ports[0].substream,
 865                                      urb->transfer_buffer,
 866                                      count);
 867         if (count < 1) {
 868                 ep->ports[0].active = 0;
 869                 return;
 870         }
 871
 872         memset(urb->transfer_buffer + count, 0xFD, ep->max_transfer - count);
 873         urb->transfer_buffer_length = ep->max_transfer;
 874 }
 875
 876 static struct usb_protocol_ops snd_usbmidi_122l_ops = {
 877         .input = snd_usbmidi_us122l_input,
 878         .output = snd_usbmidi_us122l_output,
 879 };
 880
 881 /*
 882  * Emagic USB MIDI protocol: raw MIDI with "F5 xx" port switching.
 883  */
 884
 885 static void snd_usbmidi_emagic_init_out(struct snd_usb_midi_out_endpoint* ep)
 886 {
 887         static const u8 init_data[] = {
 888                 /* initialization magic: "get version" */
 889                 0xf0,
 890                 0x00, 0x20, 0x31,       /* Emagic */
 891                 0x64,                   /* Unitor8 */
 892                 0x0b,                   /* version number request */
 893                 0x00,                   /* command version */
 894                 0x00,                   /* EEPROM, box 0 */
 895                 0xf7
 896         };
 897         send_bulk_static_data(ep, init_data, sizeof(init_data));
 898         /* while we're at it, pour on more magic */
 899         send_bulk_static_data(ep, init_data, sizeof(init_data));
 900 }
 901
 902 static void snd_usbmidi_emagic_finish_out(struct snd_usb_midi_out_endpoint* ep)
 903 {
 904         static const u8 finish_data[] = {
 905                 /* switch to patch mode with last preset */
 906                 0xf0,
 907                 0x00, 0x20, 0x31,       /* Emagic */
 908                 0x64,                   /* Unitor8 */
 909                 0x10,                   /* patch switch command */
 910                 0x00,                   /* command version */
 911                 0x7f,                   /* to all boxes */
 912                 0x40,                   /* last preset in EEPROM */
 913                 0xf7
 914         };
 915         send_bulk_static_data(ep, finish_data, sizeof(finish_data));
 916 }
 917
 918 static void snd_usbmidi_emagic_input(struct snd_usb_midi_in_endpoint* ep,
 919                                      uint8_t* buffer, int buffer_length)
 920 {
 921         int i;
 922
 923         /* FF indicates end of valid data */
 924         for (i = 0; i < buffer_length; ++i)
 925                 if (buffer[i] == 0xff) {
 926                         buffer_length = i;
 927                         break;
 928                 }
 929
 930         /* handle F5 at end of last buffer */
 931         if (ep->seen_f5)
 932                 goto switch_port;
 933
 934         while (buffer_length > 0) {
 935                 /* determine size of data until next F5 */
 936                 for (i = 0; i < buffer_length; ++i)
 937                         if (buffer[i] == 0xf5)
 938                                 break;
 939                 snd_usbmidi_input_data(ep, ep->current_port, buffer, i);
 940                 buffer += i;
 941                 buffer_length -= i;
 942
 943                 if (buffer_length <= 0)
 944                         break;
 945                 /* assert(buffer[0] == 0xf5); */
 946                 ep->seen_f5 = 1;
 947                 ++buffer;
 948                 --buffer_length;
 949
 950         switch_port:
 951                 if (buffer_length <= 0)
 952                         break;
 953                 if (buffer[0] < 0x80) {
 954                         ep->current_port = (buffer[0] - 1) & 15;
 955                         ++buffer;
 956                         --buffer_length;
 957                 }
 958                 ep->seen_f5 = 0;
 959         }
 960 }
 961
 962 static void snd_usbmidi_emagic_output(struct snd_usb_midi_out_endpoint* ep,
 963                                       struct urb *urb)
 964 {
 965         int port0 = ep->current_port;
 966         uint8_t* buf = urb->transfer_buffer;
 967         int buf_free = ep->max_transfer;
 968         int length, i;
 969
 970         for (i = 0; i < 0x10; ++i) {
 971                 /* round-robin, starting at the last current port */
 972                 int portnum = (port0 + i) & 15;
 973                 struct usbmidi_out_port* port = &ep->ports[portnum];
 974
 975                 if (!port->active)
 976                         continue;
 977                 if (snd_rawmidi_transmit_peek(port->substream, buf, 1) != 1) {
 978                         port->active = 0;
 979                         continue;
 980                 }
 981
 982                 if (portnum != ep->current_port) {
 983                         if (buf_free < 2)
 984                                 break;
 985                         ep->current_port = portnum;
 986                         buf[0] = 0xf5;
 987                         buf[1] = (portnum + 1) & 15;
 988                         buf += 2;
 989                         buf_free -= 2;
 990                 }
 991
 992                 if (buf_free < 1)
 993                         break;
 994                 length = snd_rawmidi_transmit(port->substream, buf, buf_free);
 995                 if (length > 0) {
 996                         buf += length;
 997                         buf_free -= length;
 998                         if (buf_free < 1)
 999                                 break;
1000                 }
1001         }
1002         if (buf_free < ep->max_transfer && buf_free > 0) {
1003                 *buf = 0xff;
1004                 --buf_free;
1005         }
1006         urb->transfer_buffer_length = ep->max_transfer - buf_free;
1007 }
1008
1009 static struct usb_protocol_ops snd_usbmidi_emagic_ops = {
1010         .input = snd_usbmidi_emagic_input,
1011         .output = snd_usbmidi_emagic_output,
1012         .init_out_endpoint = snd_usbmidi_emagic_init_out,
1013         .finish_out_endpoint = snd_usbmidi_emagic_finish_out,
1014 };
1015
1016
1017 static void update_roland_altsetting(struct snd_usb_midi* umidi)
1018 {
1019         struct usb_interface *intf;
1020         struct usb_host_interface *hostif;
1021         struct usb_interface_descriptor *intfd;
1022         int is_light_load;
1023
1024         intf = umidi->iface;
1025         is_light_load = intf->cur_altsetting != intf->altsetting;
1026         if (umidi->roland_load_ctl->private_value == is_light_load)
1027                 return;
1028         hostif = &intf->altsetting[umidi->roland_load_ctl->private_value];
1029         intfd = get_iface_desc(hostif);
1030         snd_usbmidi_input_stop(&umidi->list);
1031         usb_set_interface(umidi->dev, intfd->bInterfaceNumber,
1032                           intfd->bAlternateSetting);
1033         snd_usbmidi_input_start(&umidi->list);
1034 }
1035
1036 static void substream_open(struct snd_rawmidi_substream *substream, int open)
1037 {
1038         struct snd_usb_midi* umidi = substream->rmidi->private_data;
1039         struct snd_kcontrol *ctl;
1040
1041         mutex_lock(&umidi->mutex);
1042         if (open) {
1043                 if (umidi->opened++ == 0 && umidi->roland_load_ctl) {
1044                         ctl = umidi->roland_load_ctl;
1045                         ctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
1046                         snd_ctl_notify(umidi->card,
1047                                        SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
1048                         update_roland_altsetting(umidi);
1049                 }
1050         } else {
1051                 if (--umidi->opened == 0 && umidi->roland_load_ctl) {
1052                         ctl = umidi->roland_load_ctl;
1053                         ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
1054                         snd_ctl_notify(umidi->card,
1055                                        SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
1056                 }
1057         }
1058         mutex_unlock(&umidi->mutex);
1059 }
1060
1061 static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
1062 {
1063         struct snd_usb_midi* umidi = substream->rmidi->private_data;
1064         struct usbmidi_out_port* port = NULL;
1065         int i, j;
1066         int err;
1067
1068         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
1069                 if (umidi->endpoints[i].out)
1070                         for (j = 0; j < 0x10; ++j)
1071                                 if (umidi->endpoints[i].out->ports[j].substream == substream) {
1072                                         port = &umidi->endpoints[i].out->ports[j];
1073                                         break;
1074                                 }
1075         if (!port) {
1076                 snd_BUG();
1077                 return -ENXIO;
1078         }
1079         err = usb_autopm_get_interface(umidi->iface);
1080         port->autopm_reference = err >= 0;
1081         if (err < 0 && err != -EACCES)
1082                 return -EIO;
1083         substream->runtime->private_data = port;
1084         port->state = STATE_UNKNOWN;
1085         substream_open(substream, 1);
1086         return 0;
1087 }
1088
1089 static int snd_usbmidi_output_close(struct snd_rawmidi_substream *substream)
1090 {
1091         struct snd_usb_midi* umidi = substream->rmidi->private_data;
1092         struct usbmidi_out_port *port = substream->runtime->private_data;
1093
1094         substream_open(substream, 0);
1095         if (port->autopm_reference)
1096                 usb_autopm_put_interface(umidi->iface);
1097         return 0;
1098 }
1099
1100 static void snd_usbmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
1101 {
1102         struct usbmidi_out_port* port = (struct usbmidi_out_port*)substream->runtime->private_data;
1103
1104         port->active = up;
1105         if (up) {
1106                 if (port->ep->umidi->disconnected) {
1107                         /* gobble up remaining bytes to prevent wait in
1108                          * snd_rawmidi_drain_output */
1109                         while (!snd_rawmidi_transmit_empty(substream))
1110                                 snd_rawmidi_transmit_ack(substream, 1);
1111                         return;
1112                 }
1113                 tasklet_schedule(&port->ep->tasklet);
1114         }
1115 }
1116
1117 static void snd_usbmidi_output_drain(struct snd_rawmidi_substream *substream)
1118 {
1119         struct usbmidi_out_port* port = substream->runtime->private_data;
1120         struct snd_usb_midi_out_endpoint *ep = port->ep;
1121         unsigned int drain_urbs;
1122         DEFINE_WAIT(wait);
1123         long timeout = msecs_to_jiffies(50);
1124
1125         if (ep->umidi->disconnected)
1126                 return;
1127         /*
1128          * The substream buffer is empty, but some data might still be in the
1129          * currently active URBs, so we have to wait for those to complete.
1130          */
1131         spin_lock_irq(&ep->buffer_lock);
1132         drain_urbs = ep->active_urbs;
1133         if (drain_urbs) {
1134                 ep->drain_urbs |= drain_urbs;
1135                 do {
1136                         prepare_to_wait(&ep->drain_wait, &wait,
1137                                         TASK_UNINTERRUPTIBLE);
1138                         spin_unlock_irq(&ep->buffer_lock);
1139                         timeout = schedule_timeout(timeout);
1140                         spin_lock_irq(&ep->buffer_lock);
1141                         drain_urbs &= ep->drain_urbs;
1142                 } while (drain_urbs && timeout);
1143                 finish_wait(&ep->drain_wait, &wait);
1144         }
1145         spin_unlock_irq(&ep->buffer_lock);
1146 }
1147
1148 static int snd_usbmidi_input_open(struct snd_rawmidi_substream *substream)
1149 {
1150         substream_open(substream, 1);
1151         return 0;
1152 }
1153
1154 static int snd_usbmidi_input_close(struct snd_rawmidi_substream *substream)
1155 {
1156         substream_open(substream, 0);
1157         return 0;
1158 }
1159
1160 static void snd_usbmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
1161 {
1162         struct snd_usb_midi* umidi = substream->rmidi->private_data;
1163
1164         if (up)
1165                 set_bit(substream->number, &umidi->input_triggered);
1166         else
1167                 clear_bit(substream->number, &umidi->input_triggered);
1168 }
1169
1170 static struct snd_rawmidi_ops snd_usbmidi_output_ops = {
1171         .open = snd_usbmidi_output_open,
1172         .close = snd_usbmidi_output_close,
1173         .trigger = snd_usbmidi_output_trigger,
1174         .drain = snd_usbmidi_output_drain,
1175 };
1176
1177 static struct snd_rawmidi_ops snd_usbmidi_input_ops = {
1178         .open = snd_usbmidi_input_open,
1179         .close = snd_usbmidi_input_close,
1180         .trigger = snd_usbmidi_input_trigger
1181 };
1182
1183 static void free_urb_and_buffer(struct snd_usb_midi *umidi, struct urb *urb,
1184                                 unsigned int buffer_length)
1185 {
1186         usb_free_coherent(umidi->dev, buffer_length,
1187                           urb->transfer_buffer, urb->transfer_dma);
1188         usb_free_urb(urb);
1189 }
1190
1191 /*
1192  * Frees an input endpoint.
1193  * May be called when ep hasn't been initialized completely.
1194  */
1195 static void snd_usbmidi_in_endpoint_delete(struct snd_usb_midi_in_endpoint* ep)
1196 {
1197         unsigned int i;
1198
1199         for (i = 0; i < INPUT_URBS; ++i)
1200                 if (ep->urbs[i])
1201                         free_urb_and_buffer(ep->umidi, ep->urbs[i],
1202                                             ep->urbs[i]->transfer_buffer_length);
1203         kfree(ep);
1204 }
1205
1206 /*
1207  * Creates an input endpoint.
1208  */
1209 static int snd_usbmidi_in_endpoint_create(struct snd_usb_midi* umidi,
1210                                           struct snd_usb_midi_endpoint_info* ep_info,
1211                                           struct snd_usb_midi_endpoint* rep)
1212 {
1213         struct snd_usb_midi_in_endpoint* ep;
1214         void* buffer;
1215         unsigned int pipe;
1216         int length;
1217         unsigned int i;
1218
1219         rep->in = NULL;
1220         ep = kzalloc(sizeof(*ep), GFP_KERNEL);
1221         if (!ep)
1222                 return -ENOMEM;
1223         ep->umidi = umidi;
1224
1225         for (i = 0; i < INPUT_URBS; ++i) {
1226                 ep->urbs[i] = usb_alloc_urb(0, GFP_KERNEL);
1227                 if (!ep->urbs[i]) {
1228                         snd_usbmidi_in_endpoint_delete(ep);
1229                         return -ENOMEM;
1230                 }
1231         }
1232         if (ep_info->in_interval)
1233                 pipe = usb_rcvintpipe(umidi->dev, ep_info->in_ep);
1234         else
1235                 pipe = usb_rcvbulkpipe(umidi->dev, ep_info->in_ep);
1236         length = usb_maxpacket(umidi->dev, pipe, 0);
1237         for (i = 0; i < INPUT_URBS; ++i) {
1238                 buffer = usb_alloc_coherent(umidi->dev, length, GFP_KERNEL,
1239                                             &ep->urbs[i]->transfer_dma);
1240                 if (!buffer) {
1241                         snd_usbmidi_in_endpoint_delete(ep);
1242                         return -ENOMEM;
1243                 }
1244                 if (ep_info->in_interval)
1245                         usb_fill_int_urb(ep->urbs[i], umidi->dev,
1246                                          pipe, buffer, length,
1247                                          snd_usbmidi_in_urb_complete,
1248                                          ep, ep_info->in_interval);
1249                 else
1250                         usb_fill_bulk_urb(ep->urbs[i], umidi->dev,
1251                                           pipe, buffer, length,
1252                                           snd_usbmidi_in_urb_complete, ep);
1253                 ep->urbs[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1254         }
1255
1256         rep->in = ep;
1257         return 0;
1258 }
1259
1260 /*
1261  * Frees an output endpoint.
1262  * May be called when ep hasn't been initialized completely.
1263  */
1264 static void snd_usbmidi_out_endpoint_clear(struct snd_usb_midi_out_endpoint *ep)
1265 {
1266         unsigned int i;
1267
1268         for (i = 0; i < OUTPUT_URBS; ++i)
1269                 if (ep->urbs[i].urb) {
1270                         free_urb_and_buffer(ep->umidi, ep->urbs[i].urb,
1271                                             ep->max_transfer);
1272                         ep->urbs[i].urb = NULL;
1273                 }
1274 }
1275
1276 static void snd_usbmidi_out_endpoint_delete(struct snd_usb_midi_out_endpoint *ep)
1277 {
1278         snd_usbmidi_out_endpoint_clear(ep);
1279         kfree(ep);
1280 }
1281
1282 /*
1283  * Creates an output endpoint, and initializes output ports.
1284  */
1285 static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi* umidi,
1286                                            struct snd_usb_midi_endpoint_info* ep_info,
1287                                            struct snd_usb_midi_endpoint* rep)
1288 {
1289         struct snd_usb_midi_out_endpoint* ep;
1290         unsigned int i;
1291         unsigned int pipe;
1292         void* buffer;
1293
1294         rep->out = NULL;
1295         ep = kzalloc(sizeof(*ep), GFP_KERNEL);
1296         if (!ep)
1297                 return -ENOMEM;
1298         ep->umidi = umidi;
1299
1300         for (i = 0; i < OUTPUT_URBS; ++i) {
1301                 ep->urbs[i].urb = usb_alloc_urb(0, GFP_KERNEL);
1302                 if (!ep->urbs[i].urb) {
1303                         snd_usbmidi_out_endpoint_delete(ep);
1304                         return -ENOMEM;
1305                 }
1306                 ep->urbs[i].ep = ep;
1307         }
1308         if (ep_info->out_interval)
1309                 pipe = usb_sndintpipe(umidi->dev, ep_info->out_ep);
1310         else
1311                 pipe = usb_sndbulkpipe(umidi->dev, ep_info->out_ep);
1312         switch (umidi->usb_id) {
1313         default:
1314                 ep->max_transfer = usb_maxpacket(umidi->dev, pipe, 1);
1315                 break;
1316                 /*
1317                  * Various chips declare a packet size larger than 4 bytes, but
1318                  * do not actually work with larger packets:
1319                  */
1320         case USB_ID(0x0a92, 0x1020): /* ESI M4U */
1321         case USB_ID(0x1430, 0x474b): /* RedOctane GH MIDI INTERFACE */
1322         case USB_ID(0x15ca, 0x0101): /* Textech USB Midi Cable */
1323         case USB_ID(0x15ca, 0x1806): /* Textech USB Midi Cable */
1324         case USB_ID(0x1a86, 0x752d): /* QinHeng CH345 "USB2.0-MIDI" */
1325         case USB_ID(0xfc08, 0x0101): /* Unknown vendor Cable */
1326                 ep->max_transfer = 4;
1327                 break;
1328                 /*
1329                  * Some devices only work with 9 bytes packet size:
1330                  */
1331         case USB_ID(0x0644, 0x800E): /* Tascam US-122L */
1332         case USB_ID(0x0644, 0x800F): /* Tascam US-144 */
1333                 ep->max_transfer = 9;
1334                 break;
1335         }
1336         for (i = 0; i < OUTPUT_URBS; ++i) {
1337                 buffer = usb_alloc_coherent(umidi->dev,
1338                                             ep->max_transfer, GFP_KERNEL,
1339                                             &ep->urbs[i].urb->transfer_dma);
1340                 if (!buffer) {
1341                         snd_usbmidi_out_endpoint_delete(ep);
1342                         return -ENOMEM;
1343                 }
1344                 if (ep_info->out_interval)
1345                         usb_fill_int_urb(ep->urbs[i].urb, umidi->dev,
1346                                          pipe, buffer, ep->max_transfer,
1347                                          snd_usbmidi_out_urb_complete,
1348                                          &ep->urbs[i], ep_info->out_interval);
1349                 else
1350                         usb_fill_bulk_urb(ep->urbs[i].urb, umidi->dev,
1351                                           pipe, buffer, ep->max_transfer,
1352                                           snd_usbmidi_out_urb_complete,
1353                                           &ep->urbs[i]);
1354                 ep->urbs[i].urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1355         }
1356
1357         spin_lock_init(&ep->buffer_lock);
1358         tasklet_init(&ep->tasklet, snd_usbmidi_out_tasklet, (unsigned long)ep);
1359         init_waitqueue_head(&ep->drain_wait);
1360
1361         for (i = 0; i < 0x10; ++i)
1362                 if (ep_info->out_cables & (1 << i)) {
1363                         ep->ports[i].ep = ep;
1364                         ep->ports[i].cable = i << 4;
1365                 }
1366
1367         if (umidi->usb_protocol_ops->init_out_endpoint)
1368                 umidi->usb_protocol_ops->init_out_endpoint(ep);
1369
1370         rep->out = ep;
1371         return 0;
1372 }
1373
1374 /*
1375  * Frees everything.
1376  */
1377 static void snd_usbmidi_free(struct snd_usb_midi* umidi)
1378 {
1379         int i;
1380
1381         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1382                 struct snd_usb_midi_endpoint* ep = &umidi->endpoints[i];
1383                 if (ep->out)
1384                         snd_usbmidi_out_endpoint_delete(ep->out);
1385                 if (ep->in)
1386                         snd_usbmidi_in_endpoint_delete(ep->in);
1387         }
1388         mutex_destroy(&umidi->mutex);
1389         kfree(umidi);
1390 }
1391
1392 /*
1393  * Unlinks all URBs (must be done before the usb_device is deleted).
1394  */
1395 void snd_usbmidi_disconnect(struct list_head* p)
1396 {
1397         struct snd_usb_midi* umidi;
1398         unsigned int i, j;
1399
1400         umidi = list_entry(p, struct snd_usb_midi, list);
1401         /*
1402          * an URB's completion handler may start the timer and
1403          * a timer may submit an URB. To reliably break the cycle
1404          * a flag under lock must be used
1405          */
1406         spin_lock_irq(&umidi->disc_lock);
1407         umidi->disconnected = 1;
1408         spin_unlock_irq(&umidi->disc_lock);
1409         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1410                 struct snd_usb_midi_endpoint* ep = &umidi->endpoints[i];
1411                 if (ep->out)
1412                         tasklet_kill(&ep->out->tasklet);
1413                 if (ep->out) {
1414                         for (j = 0; j < OUTPUT_URBS; ++j)
1415                                 usb_kill_urb(ep->out->urbs[j].urb);
1416                         if (umidi->usb_protocol_ops->finish_out_endpoint)
1417                                 umidi->usb_protocol_ops->finish_out_endpoint(ep->out);
1418                         ep->out->active_urbs = 0;
1419                         if (ep->out->drain_urbs) {
1420                                 ep->out->drain_urbs = 0;
1421                                 wake_up(&ep->out->drain_wait);
1422                         }
1423                 }
1424                 if (ep->in)
1425                         for (j = 0; j < INPUT_URBS; ++j)
1426                                 usb_kill_urb(ep->in->urbs[j]);
1427                 /* free endpoints here; later call can result in Oops */
1428                 if (ep->out)
1429                         snd_usbmidi_out_endpoint_clear(ep->out);
1430                 if (ep->in) {
1431                         snd_usbmidi_in_endpoint_delete(ep->in);
1432                         ep->in = NULL;
1433                 }
1434         }
1435         del_timer_sync(&umidi->error_timer);
1436 }
1437
1438 static void snd_usbmidi_rawmidi_free(struct snd_rawmidi *rmidi)
1439 {
1440         struct snd_usb_midi* umidi = rmidi->private_data;
1441         snd_usbmidi_free(umidi);
1442 }
1443
1444 static struct snd_rawmidi_substream *snd_usbmidi_find_substream(struct snd_usb_midi* umidi,
1445                                                                 int stream, int number)
1446 {
1447         struct list_head* list;
1448
1449         list_for_each(list, &umidi->rmidi->streams[stream].substreams) {
1450                 struct snd_rawmidi_substream *substream = list_entry(list, struct snd_rawmidi_substream, list);
1451                 if (substream->number == number)
1452                         return substream;
1453         }
1454         return NULL;
1455 }
1456
1457 /*
1458  * This list specifies names for ports that do not fit into the standard
1459  * "(product) MIDI (n)" schema because they aren't external MIDI ports,
1460  * such as internal control or synthesizer ports.
1461  */
1462 static struct port_info {
1463         u32 id;
1464         short int port;
1465         short int voices;
1466         const char *name;
1467         unsigned int seq_flags;
1468 } snd_usbmidi_port_info[] = {
1469 #define PORT_INFO(vendor, product, num, name_, voices_, flags) \
1470         { .id = USB_ID(vendor, product), \
1471           .port = num, .voices = voices_, \
1472           .name = name_, .seq_flags = flags }
1473 #define EXTERNAL_PORT(vendor, product, num, name) \
1474         PORT_INFO(vendor, product, num, name, 0, \
1475                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1476                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1477                   SNDRV_SEQ_PORT_TYPE_PORT)
1478 #define CONTROL_PORT(vendor, product, num, name) \
1479         PORT_INFO(vendor, product, num, name, 0, \
1480                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1481                   SNDRV_SEQ_PORT_TYPE_HARDWARE)
1482 #define ROLAND_SYNTH_PORT(vendor, product, num, name, voices) \
1483         PORT_INFO(vendor, product, num, name, voices, \
1484                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1485                   SNDRV_SEQ_PORT_TYPE_MIDI_GM | \
1486                   SNDRV_SEQ_PORT_TYPE_MIDI_GM2 | \
1487                   SNDRV_SEQ_PORT_TYPE_MIDI_GS | \
1488                   SNDRV_SEQ_PORT_TYPE_MIDI_XG | \
1489                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1490                   SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
1491 #define SOUNDCANVAS_PORT(vendor, product, num, name, voices) \
1492         PORT_INFO(vendor, product, num, name, voices, \
1493                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1494                   SNDRV_SEQ_PORT_TYPE_MIDI_GM | \
1495                   SNDRV_SEQ_PORT_TYPE_MIDI_GM2 | \
1496                   SNDRV_SEQ_PORT_TYPE_MIDI_GS | \
1497                   SNDRV_SEQ_PORT_TYPE_MIDI_XG | \
1498                   SNDRV_SEQ_PORT_TYPE_MIDI_MT32 | \
1499                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1500                   SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
1501         /* Roland UA-100 */
1502         CONTROL_PORT(0x0582, 0x0000, 2, "%s Control"),
1503         /* Roland SC-8850 */
1504         SOUNDCANVAS_PORT(0x0582, 0x0003, 0, "%s Part A", 128),
1505         SOUNDCANVAS_PORT(0x0582, 0x0003, 1, "%s Part B", 128),
1506         SOUNDCANVAS_PORT(0x0582, 0x0003, 2, "%s Part C", 128),
1507         SOUNDCANVAS_PORT(0x0582, 0x0003, 3, "%s Part D", 128),
1508         EXTERNAL_PORT(0x0582, 0x0003, 4, "%s MIDI 1"),
1509         EXTERNAL_PORT(0x0582, 0x0003, 5, "%s MIDI 2"),
1510         /* Roland U-8 */
1511         EXTERNAL_PORT(0x0582, 0x0004, 0, "%s MIDI"),
1512         CONTROL_PORT(0x0582, 0x0004, 1, "%s Control"),
1513         /* Roland SC-8820 */
1514         SOUNDCANVAS_PORT(0x0582, 0x0007, 0, "%s Part A", 64),
1515         SOUNDCANVAS_PORT(0x0582, 0x0007, 1, "%s Part B", 64),
1516         EXTERNAL_PORT(0x0582, 0x0007, 2, "%s MIDI"),
1517         /* Roland SK-500 */
1518         SOUNDCANVAS_PORT(0x0582, 0x000b, 0, "%s Part A", 64),
1519         SOUNDCANVAS_PORT(0x0582, 0x000b, 1, "%s Part B", 64),
1520         EXTERNAL_PORT(0x0582, 0x000b, 2, "%s MIDI"),
1521         /* Roland SC-D70 */
1522         SOUNDCANVAS_PORT(0x0582, 0x000c, 0, "%s Part A", 64),
1523         SOUNDCANVAS_PORT(0x0582, 0x000c, 1, "%s Part B", 64),
1524         EXTERNAL_PORT(0x0582, 0x000c, 2, "%s MIDI"),
1525         /* Edirol UM-880 */
1526         CONTROL_PORT(0x0582, 0x0014, 8, "%s Control"),
1527         /* Edirol SD-90 */
1528         ROLAND_SYNTH_PORT(0x0582, 0x0016, 0, "%s Part A", 128),
1529         ROLAND_SYNTH_PORT(0x0582, 0x0016, 1, "%s Part B", 128),
1530         EXTERNAL_PORT(0x0582, 0x0016, 2, "%s MIDI 1"),
1531         EXTERNAL_PORT(0x0582, 0x0016, 3, "%s MIDI 2"),
1532         /* Edirol UM-550 */
1533         CONTROL_PORT(0x0582, 0x0023, 5, "%s Control"),
1534         /* Edirol SD-20 */
1535         ROLAND_SYNTH_PORT(0x0582, 0x0027, 0, "%s Part A", 64),
1536         ROLAND_SYNTH_PORT(0x0582, 0x0027, 1, "%s Part B", 64),
1537         EXTERNAL_PORT(0x0582, 0x0027, 2, "%s MIDI"),
1538         /* Edirol SD-80 */
1539         ROLAND_SYNTH_PORT(0x0582, 0x0029, 0, "%s Part A", 128),
1540         ROLAND_SYNTH_PORT(0x0582, 0x0029, 1, "%s Part B", 128),
1541         EXTERNAL_PORT(0x0582, 0x0029, 2, "%s MIDI 1"),
1542         EXTERNAL_PORT(0x0582, 0x0029, 3, "%s MIDI 2"),
1543         /* Edirol UA-700 */
1544         EXTERNAL_PORT(0x0582, 0x002b, 0, "%s MIDI"),
1545         CONTROL_PORT(0x0582, 0x002b, 1, "%s Control"),
1546         /* Roland VariOS */
1547         EXTERNAL_PORT(0x0582, 0x002f, 0, "%s MIDI"),
1548         EXTERNAL_PORT(0x0582, 0x002f, 1, "%s External MIDI"),
1549         EXTERNAL_PORT(0x0582, 0x002f, 2, "%s Sync"),
1550         /* Edirol PCR */
1551         EXTERNAL_PORT(0x0582, 0x0033, 0, "%s MIDI"),
1552         EXTERNAL_PORT(0x0582, 0x0033, 1, "%s 1"),
1553         EXTERNAL_PORT(0x0582, 0x0033, 2, "%s 2"),
1554         /* BOSS GS-10 */
1555         EXTERNAL_PORT(0x0582, 0x003b, 0, "%s MIDI"),
1556         CONTROL_PORT(0x0582, 0x003b, 1, "%s Control"),
1557         /* Edirol UA-1000 */
1558         EXTERNAL_PORT(0x0582, 0x0044, 0, "%s MIDI"),
1559         CONTROL_PORT(0x0582, 0x0044, 1, "%s Control"),
1560         /* Edirol UR-80 */
1561         EXTERNAL_PORT(0x0582, 0x0048, 0, "%s MIDI"),
1562         EXTERNAL_PORT(0x0582, 0x0048, 1, "%s 1"),
1563         EXTERNAL_PORT(0x0582, 0x0048, 2, "%s 2"),
1564         /* Edirol PCR-A */
1565         EXTERNAL_PORT(0x0582, 0x004d, 0, "%s MIDI"),
1566         EXTERNAL_PORT(0x0582, 0x004d, 1, "%s 1"),
1567         EXTERNAL_PORT(0x0582, 0x004d, 2, "%s 2"),
1568         /* Edirol UM-3EX */
1569         CONTROL_PORT(0x0582, 0x009a, 3, "%s Control"),
1570         /* M-Audio MidiSport 8x8 */
1571         CONTROL_PORT(0x0763, 0x1031, 8, "%s Control"),
1572         CONTROL_PORT(0x0763, 0x1033, 8, "%s Control"),
1573         /* MOTU Fastlane */
1574         EXTERNAL_PORT(0x07fd, 0x0001, 0, "%s MIDI A"),
1575         EXTERNAL_PORT(0x07fd, 0x0001, 1, "%s MIDI B"),
1576         /* Emagic Unitor8/AMT8/MT4 */
1577         EXTERNAL_PORT(0x086a, 0x0001, 8, "%s Broadcast"),
1578         EXTERNAL_PORT(0x086a, 0x0002, 8, "%s Broadcast"),
1579         EXTERNAL_PORT(0x086a, 0x0003, 4, "%s Broadcast"),
1580         /* Akai MPD16 */
1581         CONTROL_PORT(0x09e8, 0x0062, 0, "%s Control"),
1582         PORT_INFO(0x09e8, 0x0062, 1, "%s MIDI", 0,
1583                 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
1584                 SNDRV_SEQ_PORT_TYPE_HARDWARE),
1585         /* Access Music Virus TI */
1586         EXTERNAL_PORT(0x133e, 0x0815, 0, "%s MIDI"),
1587         PORT_INFO(0x133e, 0x0815, 1, "%s Synth", 0,
1588                 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
1589                 SNDRV_SEQ_PORT_TYPE_HARDWARE |
1590                 SNDRV_SEQ_PORT_TYPE_SYNTHESIZER),
1591 };
1592
1593 static struct port_info *find_port_info(struct snd_usb_midi* umidi, int number)
1594 {
1595         int i;
1596
1597         for (i = 0; i < ARRAY_SIZE(snd_usbmidi_port_info); ++i) {
1598                 if (snd_usbmidi_port_info[i].id == umidi->usb_id &&
1599                     snd_usbmidi_port_info[i].port == number)
1600                         return &snd_usbmidi_port_info[i];
1601         }
1602         return NULL;
1603 }
1604
1605 static void snd_usbmidi_get_port_info(struct snd_rawmidi *rmidi, int number,
1606                                       struct snd_seq_port_info *seq_port_info)
1607 {
1608         struct snd_usb_midi *umidi = rmidi->private_data;
1609         struct port_info *port_info;
1610
1611         /* TODO: read port flags from descriptors */
1612         port_info = find_port_info(umidi, number);
1613         if (port_info) {
1614                 seq_port_info->type = port_info->seq_flags;
1615                 seq_port_info->midi_voices = port_info->voices;
1616         }
1617 }
1618
1619 static void snd_usbmidi_init_substream(struct snd_usb_midi* umidi,
1620                                        int stream, int number,
1621                                        struct snd_rawmidi_substream ** rsubstream)
1622 {
1623         struct port_info *port_info;
1624         const char *name_format;
1625
1626         struct snd_rawmidi_substream *substream = snd_usbmidi_find_substream(umidi, stream, number);
1627         if (!substream) {
1628                 snd_printd(KERN_ERR "substream %d:%d not found\n", stream, number);
1629                 return;
1630         }
1631
1632         /* TODO: read port name from jack descriptor */
1633         port_info = find_port_info(umidi, number);
1634         name_format = port_info ? port_info->name : "%s MIDI %d";
1635         snprintf(substream->name, sizeof(substream->name),
1636                  name_format, umidi->card->shortname, number + 1);
1637
1638         *rsubstream = substream;
1639 }
1640
1641 /*
1642  * Creates the endpoints and their ports.
1643  */
1644 static int snd_usbmidi_create_endpoints(struct snd_usb_midi* umidi,
1645                                         struct snd_usb_midi_endpoint_info* endpoints)
1646 {
1647         int i, j, err;
1648         int out_ports = 0, in_ports = 0;
1649
1650         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1651                 if (endpoints[i].out_cables) {
1652                         err = snd_usbmidi_out_endpoint_create(umidi, &endpoints[i],
1653                                                               &umidi->endpoints[i]);
1654                         if (err < 0)
1655                                 return err;
1656                 }
1657                 if (endpoints[i].in_cables) {
1658                         err = snd_usbmidi_in_endpoint_create(umidi, &endpoints[i],
1659                                                              &umidi->endpoints[i]);
1660                         if (err < 0)
1661                                 return err;
1662                 }
1663
1664                 for (j = 0; j < 0x10; ++j) {
1665                         if (endpoints[i].out_cables & (1 << j)) {
1666                                 snd_usbmidi_init_substream(umidi, SNDRV_RAWMIDI_STREAM_OUTPUT, out_ports,
1667                                                            &umidi->endpoints[i].out->ports[j].substream);
1668                                 ++out_ports;
1669                         }
1670                         if (endpoints[i].in_cables & (1 << j)) {
1671                                 snd_usbmidi_init_substream(umidi, SNDRV_RAWMIDI_STREAM_INPUT, in_ports,
1672                                                            &umidi->endpoints[i].in->ports[j].substream);
1673                                 ++in_ports;
1674                         }
1675                 }
1676         }
1677         snd_printdd(KERN_INFO "created %d output and %d input ports\n",
1678                     out_ports, in_ports);
1679         return 0;
1680 }
1681
1682 /*
1683  * Returns MIDIStreaming device capabilities.
1684  */
1685 static int snd_usbmidi_get_ms_info(struct snd_usb_midi* umidi,
1686                                    struct snd_usb_midi_endpoint_info* endpoints)
1687 {
1688         struct usb_interface* intf;
1689         struct usb_host_interface *hostif;
1690         struct usb_interface_descriptor* intfd;
1691         struct usb_ms_header_descriptor* ms_header;
1692         struct usb_host_endpoint *hostep;
1693         struct usb_endpoint_descriptor* ep;
1694         struct usb_ms_endpoint_descriptor* ms_ep;
1695         int i, epidx;
1696
1697         intf = umidi->iface;
1698         if (!intf)
1699                 return -ENXIO;
1700         hostif = &intf->altsetting[0];
1701         intfd = get_iface_desc(hostif);
1702         ms_header = (struct usb_ms_header_descriptor*)hostif->extra;
1703         if (hostif->extralen >= 7 &&
1704             ms_header->bLength >= 7 &&
1705             ms_header->bDescriptorType == USB_DT_CS_INTERFACE &&
1706             ms_header->bDescriptorSubtype == UAC_HEADER)
1707                 snd_printdd(KERN_INFO "MIDIStreaming version %02x.%02x\n",
1708                             ms_header->bcdMSC[1], ms_header->bcdMSC[0]);
1709         else
1710                 snd_printk(KERN_WARNING "MIDIStreaming interface descriptor not found\n");
1711
1712         epidx = 0;
1713         for (i = 0; i < intfd->bNumEndpoints; ++i) {
1714                 hostep = &hostif->endpoint[i];
1715                 ep = get_ep_desc(hostep);
1716                 if (!usb_endpoint_xfer_bulk(ep) && !usb_endpoint_xfer_int(ep))
1717                         continue;
1718                 ms_ep = (struct usb_ms_endpoint_descriptor*)hostep->extra;
1719                 if (hostep->extralen < 4 ||
1720                     ms_ep->bLength < 4 ||
1721                     ms_ep->bDescriptorType != USB_DT_CS_ENDPOINT ||
1722                     ms_ep->bDescriptorSubtype != UAC_MS_GENERAL)
1723                         continue;
1724                 if (usb_endpoint_dir_out(ep)) {
1725                         if (endpoints[epidx].out_ep) {
1726                                 if (++epidx >= MIDI_MAX_ENDPOINTS) {
1727                                         snd_printk(KERN_WARNING "too many endpoints\n");
1728                                         break;
1729                                 }
1730                         }
1731                         endpoints[epidx].out_ep = usb_endpoint_num(ep);
1732                         if (usb_endpoint_xfer_int(ep))
1733                                 endpoints[epidx].out_interval = ep->bInterval;
1734                         else if (snd_usb_get_speed(umidi->dev) == USB_SPEED_LOW)
1735                                 /*
1736                                  * Low speed bulk transfers don't exist, so
1737                                  * force interrupt transfers for devices like
1738                                  * ESI MIDI Mate that try to use them anyway.
1739                                  */
1740                                 endpoints[epidx].out_interval = 1;
1741                         endpoints[epidx].out_cables = (1 << ms_ep->bNumEmbMIDIJack) - 1;
1742                         snd_printdd(KERN_INFO "EP %02X: %d jack(s)\n",
1743                                     ep->bEndpointAddress, ms_ep->bNumEmbMIDIJack);
1744                 } else {
1745                         if (endpoints[epidx].in_ep) {
1746                                 if (++epidx >= MIDI_MAX_ENDPOINTS) {
1747                                         snd_printk(KERN_WARNING "too many endpoints\n");
1748                                         break;
1749                                 }
1750                         }
1751                         endpoints[epidx].in_ep = usb_endpoint_num(ep);
1752                         if (usb_endpoint_xfer_int(ep))
1753                                 endpoints[epidx].in_interval = ep->bInterval;
1754                         else if (snd_usb_get_speed(umidi->dev) == USB_SPEED_LOW)
1755                                 endpoints[epidx].in_interval = 1;
1756                         endpoints[epidx].in_cables = (1 << ms_ep->bNumEmbMIDIJack) - 1;
1757                         snd_printdd(KERN_INFO "EP %02X: %d jack(s)\n",
1758                                     ep->bEndpointAddress, ms_ep->bNumEmbMIDIJack);
1759                 }
1760         }
1761         return 0;
1762 }
1763
1764 static int roland_load_info(struct snd_kcontrol *kcontrol,
1765                             struct snd_ctl_elem_info *info)
1766 {
1767         static const char *const names[] = { "High Load", "Light Load" };
1768
1769         return snd_ctl_enum_info(info, 1, 2, names);
1770 }
1771
1772 static int roland_load_get(struct snd_kcontrol *kcontrol,
1773                            struct snd_ctl_elem_value *value)
1774 {
1775         value->value.enumerated.item[0] = kcontrol->private_value;
1776         return 0;
1777 }
1778
1779 static int roland_load_put(struct snd_kcontrol *kcontrol,
1780                            struct snd_ctl_elem_value *value)
1781 {
1782         struct snd_usb_midi* umidi = kcontrol->private_data;
1783         int changed;
1784
1785         if (value->value.enumerated.item[0] > 1)
1786                 return -EINVAL;
1787         mutex_lock(&umidi->mutex);
1788         changed = value->value.enumerated.item[0] != kcontrol->private_value;
1789         if (changed)
1790                 kcontrol->private_value = value->value.enumerated.item[0];
1791         mutex_unlock(&umidi->mutex);
1792         return changed;
1793 }
1794
1795 static struct snd_kcontrol_new roland_load_ctl = {
1796         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1797         .name = "MIDI Input Mode",
1798         .info = roland_load_info,
1799         .get = roland_load_get,
1800         .put = roland_load_put,
1801         .private_value = 1,
1802 };
1803
1804 /*
1805  * On Roland devices, use the second alternate setting to be able to use
1806  * the interrupt input endpoint.
1807  */
1808 static void snd_usbmidi_switch_roland_altsetting(struct snd_usb_midi* umidi)
1809 {
1810         struct usb_interface* intf;
1811         struct usb_host_interface *hostif;
1812         struct usb_interface_descriptor* intfd;
1813
1814         intf = umidi->iface;
1815         if (!intf || intf->num_altsetting != 2)
1816                 return;
1817
1818         hostif = &intf->altsetting[1];
1819         intfd = get_iface_desc(hostif);
1820         if (intfd->bNumEndpoints != 2 ||
1821             (get_endpoint(hostif, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_BULK ||
1822             (get_endpoint(hostif, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_INT)
1823                 return;
1824
1825         snd_printdd(KERN_INFO "switching to altsetting %d with int ep\n",
1826                     intfd->bAlternateSetting);
1827         usb_set_interface(umidi->dev, intfd->bInterfaceNumber,
1828                           intfd->bAlternateSetting);
1829
1830         umidi->roland_load_ctl = snd_ctl_new1(&roland_load_ctl, umidi);
1831         if (snd_ctl_add(umidi->card, umidi->roland_load_ctl) < 0)
1832                 umidi->roland_load_ctl = NULL;
1833 }
1834
1835 /*
1836  * Try to find any usable endpoints in the interface.
1837  */
1838 static int snd_usbmidi_detect_endpoints(struct snd_usb_midi* umidi,
1839                                         struct snd_usb_midi_endpoint_info* endpoint,
1840                                         int max_endpoints)
1841 {
1842         struct usb_interface* intf;
1843         struct usb_host_interface *hostif;
1844         struct usb_interface_descriptor* intfd;
1845         struct usb_endpoint_descriptor* epd;
1846         int i, out_eps = 0, in_eps = 0;
1847
1848         if (USB_ID_VENDOR(umidi->usb_id) == 0x0582)
1849                 snd_usbmidi_switch_roland_altsetting(umidi);
1850
1851         if (endpoint[0].out_ep || endpoint[0].in_ep)
1852                 return 0;
1853
1854         intf = umidi->iface;
1855         if (!intf || intf->num_altsetting < 1)
1856                 return -ENOENT;
1857         hostif = intf->cur_altsetting;
1858         intfd = get_iface_desc(hostif);
1859
1860         for (i = 0; i < intfd->bNumEndpoints; ++i) {
1861                 epd = get_endpoint(hostif, i);
1862                 if (!usb_endpoint_xfer_bulk(epd) &&
1863                     !usb_endpoint_xfer_int(epd))
1864                         continue;
1865                 if (out_eps < max_endpoints &&
1866                     usb_endpoint_dir_out(epd)) {
1867                         endpoint[out_eps].out_ep = usb_endpoint_num(epd);
1868                         if (usb_endpoint_xfer_int(epd))
1869                                 endpoint[out_eps].out_interval = epd->bInterval;
1870                         ++out_eps;
1871                 }
1872                 if (in_eps < max_endpoints &&
1873                     usb_endpoint_dir_in(epd)) {
1874                         endpoint[in_eps].in_ep = usb_endpoint_num(epd);
1875                         if (usb_endpoint_xfer_int(epd))
1876                                 endpoint[in_eps].in_interval = epd->bInterval;
1877                         ++in_eps;
1878                 }
1879         }
1880         return (out_eps || in_eps) ? 0 : -ENOENT;
1881 }
1882
1883 /*
1884  * Detects the endpoints for one-port-per-endpoint protocols.
1885  */
1886 static int snd_usbmidi_detect_per_port_endpoints(struct snd_usb_midi* umidi,
1887                                                  struct snd_usb_midi_endpoint_info* endpoints)
1888 {
1889         int err, i;
1890
1891         err = snd_usbmidi_detect_endpoints(umidi, endpoints, MIDI_MAX_ENDPOINTS);
1892         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1893                 if (endpoints[i].out_ep)
1894                         endpoints[i].out_cables = 0x0001;
1895                 if (endpoints[i].in_ep)
1896                         endpoints[i].in_cables = 0x0001;
1897         }
1898         return err;
1899 }
1900
1901 /*
1902  * Detects the endpoints and ports of Yamaha devices.
1903  */
1904 static int snd_usbmidi_detect_yamaha(struct snd_usb_midi* umidi,
1905                                      struct snd_usb_midi_endpoint_info* endpoint)
1906 {
1907         struct usb_interface* intf;
1908         struct usb_host_interface *hostif;
1909         struct usb_interface_descriptor* intfd;
1910         uint8_t* cs_desc;
1911
1912         intf = umidi->iface;
1913         if (!intf)
1914                 return -ENOENT;
1915         hostif = intf->altsetting;
1916         intfd = get_iface_desc(hostif);
1917         if (intfd->bNumEndpoints < 1)
1918                 return -ENOENT;
1919
1920         /*
1921          * For each port there is one MIDI_IN/OUT_JACK descriptor, not
1922          * necessarily with any useful contents.  So simply count 'em.
1923          */
1924         for (cs_desc = hostif->extra;
1925              cs_desc < hostif->extra + hostif->extralen && cs_desc[0] >= 2;
1926              cs_desc += cs_desc[0]) {
1927                 if (cs_desc[1] == USB_DT_CS_INTERFACE) {
1928                         if (cs_desc[2] == UAC_MIDI_IN_JACK)
1929                                 endpoint->in_cables = (endpoint->in_cables << 1) | 1;
1930                         else if (cs_desc[2] == UAC_MIDI_OUT_JACK)
1931                                 endpoint->out_cables = (endpoint->out_cables << 1) | 1;
1932                 }
1933         }
1934         if (!endpoint->in_cables && !endpoint->out_cables)
1935                 return -ENOENT;
1936
1937         return snd_usbmidi_detect_endpoints(umidi, endpoint, 1);
1938 }
1939
1940 /*
1941  * Creates the endpoints and their ports for Midiman devices.
1942  */
1943 static int snd_usbmidi_create_endpoints_midiman(struct snd_usb_midi* umidi,
1944                                                 struct snd_usb_midi_endpoint_info* endpoint)
1945 {
1946         struct snd_usb_midi_endpoint_info ep_info;
1947         struct usb_interface* intf;
1948         struct usb_host_interface *hostif;
1949         struct usb_interface_descriptor* intfd;
1950         struct usb_endpoint_descriptor* epd;
1951         int cable, err;
1952
1953         intf = umidi->iface;
1954         if (!intf)
1955                 return -ENOENT;
1956         hostif = intf->altsetting;
1957         intfd = get_iface_desc(hostif);
1958         /*
1959          * The various MidiSport devices have more or less random endpoint
1960          * numbers, so we have to identify the endpoints by their index in
1961          * the descriptor array, like the driver for that other OS does.
1962          *
1963          * There is one interrupt input endpoint for all input ports, one
1964          * bulk output endpoint for even-numbered ports, and one for odd-
1965          * numbered ports.  Both bulk output endpoints have corresponding
1966          * input bulk endpoints (at indices 1 and 3) which aren't used.
1967          */
1968         if (intfd->bNumEndpoints < (endpoint->out_cables > 0x0001 ? 5 : 3)) {
1969                 snd_printdd(KERN_ERR "not enough endpoints\n");
1970                 return -ENOENT;
1971         }
1972
1973         epd = get_endpoint(hostif, 0);
1974         if (!usb_endpoint_dir_in(epd) || !usb_endpoint_xfer_int(epd)) {
1975                 snd_printdd(KERN_ERR "endpoint[0] isn't interrupt\n");
1976                 return -ENXIO;
1977         }
1978         epd = get_endpoint(hostif, 2);
1979         if (!usb_endpoint_dir_out(epd) || !usb_endpoint_xfer_bulk(epd)) {
1980                 snd_printdd(KERN_ERR "endpoint[2] isn't bulk output\n");
1981                 return -ENXIO;
1982         }
1983         if (endpoint->out_cables > 0x0001) {
1984                 epd = get_endpoint(hostif, 4);
1985                 if (!usb_endpoint_dir_out(epd) ||
1986                     !usb_endpoint_xfer_bulk(epd)) {
1987                         snd_printdd(KERN_ERR "endpoint[4] isn't bulk output\n");
1988                         return -ENXIO;
1989                 }
1990         }
1991
1992         ep_info.out_ep = get_endpoint(hostif, 2)->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
1993         ep_info.out_interval = 0;
1994         ep_info.out_cables = endpoint->out_cables & 0x5555;
1995         err = snd_usbmidi_out_endpoint_create(umidi, &ep_info, &umidi->endpoints[0]);
1996         if (err < 0)
1997                 return err;
1998
1999         ep_info.in_ep = get_endpoint(hostif, 0)->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
2000         ep_info.in_interval = get_endpoint(hostif, 0)->bInterval;
2001         ep_info.in_cables = endpoint->in_cables;
2002         err = snd_usbmidi_in_endpoint_create(umidi, &ep_info, &umidi->endpoints[0]);
2003         if (err < 0)
2004                 return err;
2005
2006         if (endpoint->out_cables > 0x0001) {
2007                 ep_info.out_ep = get_endpoint(hostif, 4)->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
2008                 ep_info.out_cables = endpoint->out_cables & 0xaaaa;
2009                 err = snd_usbmidi_out_endpoint_create(umidi, &ep_info, &umidi->endpoints[1]);
2010                 if (err < 0)
2011                         return err;
2012         }
2013
2014         for (cable = 0; cable < 0x10; ++cable) {
2015                 if (endpoint->out_cables & (1 << cable))
2016                         snd_usbmidi_init_substream(umidi, SNDRV_RAWMIDI_STREAM_OUTPUT, cable,
2017                                                    &umidi->endpoints[cable & 1].out->ports[cable].substream);
2018                 if (endpoint->in_cables & (1 << cable))
2019                         snd_usbmidi_init_substream(umidi, SNDRV_RAWMIDI_STREAM_INPUT, cable,
2020                                                    &umidi->endpoints[0].in->ports[cable].substream);
2021         }
2022         return 0;
2023 }
2024
2025 static struct snd_rawmidi_global_ops snd_usbmidi_ops = {
2026         .get_port_info = snd_usbmidi_get_port_info,
2027 };
2028
2029 static int snd_usbmidi_create_rawmidi(struct snd_usb_midi* umidi,
2030                                       int out_ports, int in_ports)
2031 {
2032         struct snd_rawmidi *rmidi;
2033         int err;
2034
2035         err = snd_rawmidi_new(umidi->card, "USB MIDI",
2036                               umidi->next_midi_device++,
2037                               out_ports, in_ports, &rmidi);
2038         if (err < 0)
2039                 return err;
2040         strcpy(rmidi->name, umidi->card->shortname);
2041         rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
2042                             SNDRV_RAWMIDI_INFO_INPUT |
2043                             SNDRV_RAWMIDI_INFO_DUPLEX;
2044         rmidi->ops = &snd_usbmidi_ops;
2045         rmidi->private_data = umidi;
2046         rmidi->private_free = snd_usbmidi_rawmidi_free;
2047         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_usbmidi_output_ops);
2048         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_usbmidi_input_ops);
2049
2050         umidi->rmidi = rmidi;
2051         return 0;
2052 }
2053
2054 /*
2055  * Temporarily stop input.
2056  */
2057 void snd_usbmidi_input_stop(struct list_head* p)
2058 {
2059         struct snd_usb_midi* umidi;
2060         unsigned int i, j;
2061
2062         umidi = list_entry(p, struct snd_usb_midi, list);
2063         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
2064                 struct snd_usb_midi_endpoint* ep = &umidi->endpoints[i];
2065                 if (ep->in)
2066                         for (j = 0; j < INPUT_URBS; ++j)
2067                                 usb_kill_urb(ep->in->urbs[j]);
2068         }
2069 }
2070
2071 static void snd_usbmidi_input_start_ep(struct snd_usb_midi_in_endpoint* ep)
2072 {
2073         unsigned int i;
2074
2075         if (!ep)
2076                 return;
2077         for (i = 0; i < INPUT_URBS; ++i) {
2078                 struct urb* urb = ep->urbs[i];
2079                 urb->dev = ep->umidi->dev;
2080                 snd_usbmidi_submit_urb(urb, GFP_KERNEL);
2081         }
2082 }
2083
2084 /*
2085  * Resume input after a call to snd_usbmidi_input_stop().
2086  */
2087 void snd_usbmidi_input_start(struct list_head* p)
2088 {
2089         struct snd_usb_midi* umidi;
2090         int i;
2091
2092         umidi = list_entry(p, struct snd_usb_midi, list);
2093         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
2094                 snd_usbmidi_input_start_ep(umidi->endpoints[i].in);
2095 }
2096
2097 /*
2098  * Creates and registers everything needed for a MIDI streaming interface.
2099  */
2100 int snd_usbmidi_create(struct snd_card *card,
2101                        struct usb_interface* iface,
2102                        struct list_head *midi_list,
2103                        const struct snd_usb_audio_quirk* quirk)
2104 {
2105         struct snd_usb_midi* umidi;
2106         struct snd_usb_midi_endpoint_info endpoints[MIDI_MAX_ENDPOINTS];
2107         int out_ports, in_ports;
2108         int i, err;
2109
2110         umidi = kzalloc(sizeof(*umidi), GFP_KERNEL);
2111         if (!umidi)
2112                 return -ENOMEM;
2113         umidi->dev = interface_to_usbdev(iface);
2114         umidi->card = card;
2115         umidi->iface = iface;
2116         umidi->quirk = quirk;
2117         umidi->usb_protocol_ops = &snd_usbmidi_standard_ops;
2118         init_timer(&umidi->error_timer);
2119         spin_lock_init(&umidi->disc_lock);
2120         mutex_init(&umidi->mutex);
2121         umidi->usb_id = USB_ID(le16_to_cpu(umidi->dev->descriptor.idVendor),
2122                                le16_to_cpu(umidi->dev->descriptor.idProduct));
2123         umidi->error_timer.function = snd_usbmidi_error_timer;
2124         umidi->error_timer.data = (unsigned long)umidi;
2125
2126         /* detect the endpoint(s) to use */
2127         memset(endpoints, 0, sizeof(endpoints));
2128         switch (quirk ? quirk->type : QUIRK_MIDI_STANDARD_INTERFACE) {
2129         case QUIRK_MIDI_STANDARD_INTERFACE:
2130                 err = snd_usbmidi_get_ms_info(umidi, endpoints);
2131                 if (umidi->usb_id == USB_ID(0x0763, 0x0150)) /* M-Audio Uno */
2132                         umidi->usb_protocol_ops =
2133                                 &snd_usbmidi_maudio_broken_running_status_ops;
2134                 break;
2135         case QUIRK_MIDI_US122L:
2136                 umidi->usb_protocol_ops = &snd_usbmidi_122l_ops;
2137                 /* fall through */
2138         case QUIRK_MIDI_FIXED_ENDPOINT:
2139                 memcpy(&endpoints[0], quirk->data,
2140                        sizeof(struct snd_usb_midi_endpoint_info));
2141                 err = snd_usbmidi_detect_endpoints(umidi, &endpoints[0], 1);
2142                 break;
2143         case QUIRK_MIDI_YAMAHA:
2144                 err = snd_usbmidi_detect_yamaha(umidi, &endpoints[0]);
2145                 break;
2146         case QUIRK_MIDI_MIDIMAN:
2147                 umidi->usb_protocol_ops = &snd_usbmidi_midiman_ops;
2148                 memcpy(&endpoints[0], quirk->data,
2149                        sizeof(struct snd_usb_midi_endpoint_info));
2150                 err = 0;
2151                 break;
2152         case QUIRK_MIDI_NOVATION:
2153                 umidi->usb_protocol_ops = &snd_usbmidi_novation_ops;
2154                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2155                 break;
2156         case QUIRK_MIDI_RAW_BYTES:
2157                 umidi->usb_protocol_ops = &snd_usbmidi_raw_ops;
2158                 /*
2159                  * Interface 1 contains isochronous endpoints, but with the same
2160                  * numbers as in interface 0.  Since it is interface 1 that the
2161                  * USB core has most recently seen, these descriptors are now
2162                  * associated with the endpoint numbers.  This will foul up our
2163                  * attempts to submit bulk/interrupt URBs to the endpoints in
2164                  * interface 0, so we have to make sure that the USB core looks
2165                  * again at interface 0 by calling usb_set_interface() on it.
2166                  */
2167                 if (umidi->usb_id == USB_ID(0x07fd, 0x0001)) /* MOTU Fastlane */
2168                         usb_set_interface(umidi->dev, 0, 0);
2169                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2170                 break;
2171         case QUIRK_MIDI_EMAGIC:
2172                 umidi->usb_protocol_ops = &snd_usbmidi_emagic_ops;
2173                 memcpy(&endpoints[0], quirk->data,
2174                        sizeof(struct snd_usb_midi_endpoint_info));
2175                 err = snd_usbmidi_detect_endpoints(umidi, &endpoints[0], 1);
2176                 break;
2177         case QUIRK_MIDI_CME:
2178                 umidi->usb_protocol_ops = &snd_usbmidi_cme_ops;
2179                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2180                 break;
2181         case QUIRK_MIDI_AKAI:
2182                 umidi->usb_protocol_ops = &snd_usbmidi_akai_ops;
2183                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2184                 /* endpoint 1 is input-only */
2185                 endpoints[1].out_cables = 0;
2186                 break;
2187         case QUIRK_MIDI_FTDI:
2188                 umidi->usb_protocol_ops = &snd_usbmidi_ftdi_ops;
2189
2190                 /* set baud rate to 31250 (48 MHz / 16 / 96) */
2191                 err = usb_control_msg(umidi->dev, usb_sndctrlpipe(umidi->dev, 0),
2192                                       3, 0x40, 0x60, 0, NULL, 0, 1000);
2193                 if (err < 0)
2194                         break;
2195
2196                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2197                 break;
2198         default:
2199                 snd_printd(KERN_ERR "invalid quirk type %d\n", quirk->type);
2200                 err = -ENXIO;
2201                 break;
2202         }
2203         if (err < 0) {
2204                 kfree(umidi);
2205                 return err;
2206         }
2207
2208         /* create rawmidi device */
2209         out_ports = 0;
2210         in_ports = 0;
2211         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
2212                 out_ports += hweight16(endpoints[i].out_cables);
2213                 in_ports += hweight16(endpoints[i].in_cables);
2214         }
2215         err = snd_usbmidi_create_rawmidi(umidi, out_ports, in_ports);
2216         if (err < 0) {
2217                 kfree(umidi);
2218                 return err;
2219         }
2220
2221         /* create endpoint/port structures */
2222         if (quirk && quirk->type == QUIRK_MIDI_MIDIMAN)
2223                 err = snd_usbmidi_create_endpoints_midiman(umidi, &endpoints[0]);
2224         else
2225                 err = snd_usbmidi_create_endpoints(umidi, endpoints);
2226         if (err < 0) {
2227                 snd_usbmidi_free(umidi);
2228                 return err;
2229         }
2230
2231         list_add_tail(&umidi->list, midi_list);
2232
2233         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
2234                 snd_usbmidi_input_start_ep(umidi->endpoints[i].in);
2235         return 0;
2236 }
2237
2238 EXPORT_SYMBOL(snd_usbmidi_create);
2239 EXPORT_SYMBOL(snd_usbmidi_input_stop);
2240 EXPORT_SYMBOL(snd_usbmidi_input_start);
2241 EXPORT_SYMBOL(snd_usbmidi_disconnect);