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 rw_semaphore disc_rwsem;
 120         struct mutex mutex;
 121         u32 usb_id;
 122         int next_midi_device;
 123
 124         struct snd_usb_midi_endpoint {
 125                 struct snd_usb_midi_out_endpoint *out;
 126                 struct snd_usb_midi_in_endpoint *in;
 127         } endpoints[MIDI_MAX_ENDPOINTS];
 128         unsigned long input_triggered;
 129         bool autopm_reference;
 130         unsigned int opened[2];
 131         unsigned char disconnected;
 132         unsigned char input_running;
 133
 134         struct snd_kcontrol *roland_load_ctl;
 135 };
 136
 137 struct snd_usb_midi_out_endpoint {
 138         struct snd_usb_midi* umidi;
 139         struct out_urb_context {
 140                 struct urb *urb;
 141                 struct snd_usb_midi_out_endpoint *ep;
 142         } urbs[OUTPUT_URBS];
 143         unsigned int active_urbs;
 144         unsigned int drain_urbs;
 145         int max_transfer;               /* size of urb buffer */
 146         struct tasklet_struct tasklet;
 147         unsigned int next_urb;
 148         spinlock_t buffer_lock;
 149
 150         struct usbmidi_out_port {
 151                 struct snd_usb_midi_out_endpoint* ep;
 152                 struct snd_rawmidi_substream *substream;
 153                 int active;
 154                 uint8_t cable;          /* cable number << 4 */
 155                 uint8_t state;
 156 #define STATE_UNKNOWN   0
 157 #define STATE_1PARAM    1
 158 #define STATE_2PARAM_1  2
 159 #define STATE_2PARAM_2  3
 160 #define STATE_SYSEX_0   4
 161 #define STATE_SYSEX_1   5
 162 #define STATE_SYSEX_2   6
 163                 uint8_t data[2];
 164         } ports[0x10];
 165         int current_port;
 166
 167         wait_queue_head_t drain_wait;
 168 };
 169
 170 struct snd_usb_midi_in_endpoint {
 171         struct snd_usb_midi* umidi;
 172         struct urb* urbs[INPUT_URBS];
 173         struct usbmidi_in_port {
 174                 struct snd_rawmidi_substream *substream;
 175                 u8 running_status_length;
 176         } ports[0x10];
 177         u8 seen_f5;
 178         u8 error_resubmit;
 179         int current_port;
 180 };
 181
 182 static void snd_usbmidi_do_output(struct snd_usb_midi_out_endpoint* ep);
 183
 184 static const uint8_t snd_usbmidi_cin_length[] = {
 185         0, 0, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 2, 2, 3, 1
 186 };
 187
 188 /*
 189  * Submits the URB, with error handling.
 190  */
 191 static int snd_usbmidi_submit_urb(struct urb* urb, gfp_t flags)
 192 {
 193         int err = usb_submit_urb(urb, flags);
 194         if (err < 0 && err != -ENODEV)
 195                 snd_printk(KERN_ERR "usb_submit_urb: %d\n", err);
 196         return err;
 197 }
 198
 199 /*
 200  * Error handling for URB completion functions.
 201  */
 202 static int snd_usbmidi_urb_error(int status)
 203 {
 204         switch (status) {
 205         /* manually unlinked, or device gone */
 206         case -ENOENT:
 207         case -ECONNRESET:
 208         case -ESHUTDOWN:
 209         case -ENODEV:
 210                 return -ENODEV;
 211         /* errors that might occur during unplugging */
 212         case -EPROTO:
 213         case -ETIME:
 214         case -EILSEQ:
 215                 return -EIO;
 216         default:
 217                 snd_printk(KERN_ERR "urb status %d\n", status);
 218                 return 0; /* continue */
 219         }
 220 }
 221
 222 /*
 223  * Receives a chunk of MIDI data.
 224  */
 225 static void snd_usbmidi_input_data(struct snd_usb_midi_in_endpoint* ep, int portidx,
 226                                    uint8_t* data, int length)
 227 {
 228         struct usbmidi_in_port* port = &ep->ports[portidx];
 229
 230         if (!port->substream) {
 231                 snd_printd("unexpected port %d!\n", portidx);
 232                 return;
 233         }
 234         if (!test_bit(port->substream->number, &ep->umidi->input_triggered))
 235                 return;
 236         snd_rawmidi_receive(port->substream, data, length);
 237 }
 238
 239 #ifdef DUMP_PACKETS
 240 static void dump_urb(const char *type, const u8 *data, int length)
 241 {
 242         snd_printk(KERN_DEBUG "%s packet: [", type);
 243         for (; length > 0; ++data, --length)
 244                 printk(" %02x", *data);
 245         printk(" ]\n");
 246 }
 247 #else
 248 #define dump_urb(type, data, length) /* nothing */
 249 #endif
 250
 251 /*
 252  * Processes the data read from the device.
 253  */
 254 static void snd_usbmidi_in_urb_complete(struct urb* urb)
 255 {
 256         struct snd_usb_midi_in_endpoint* ep = urb->context;
 257
 258         if (urb->status == 0) {
 259                 dump_urb("received", urb->transfer_buffer, urb->actual_length);
 260                 ep->umidi->usb_protocol_ops->input(ep, urb->transfer_buffer,
 261                                                    urb->actual_length);
 262         } else {
 263                 int err = snd_usbmidi_urb_error(urb->status);
 264                 if (err < 0) {
 265                         if (err != -ENODEV) {
 266                                 ep->error_resubmit = 1;
 267                                 mod_timer(&ep->umidi->error_timer,
 268                                           jiffies + ERROR_DELAY_JIFFIES);
 269                         }
 270                         return;
 271                 }
 272         }
 273
 274         urb->dev = ep->umidi->dev;
 275         snd_usbmidi_submit_urb(urb, GFP_ATOMIC);
 276 }
 277
 278 static void snd_usbmidi_out_urb_complete(struct urb* urb)
 279 {
 280         struct out_urb_context *context = urb->context;
 281         struct snd_usb_midi_out_endpoint* ep = context->ep;
 282         unsigned int urb_index;
 283
 284         spin_lock(&ep->buffer_lock);
 285         urb_index = context - ep->urbs;
 286         ep->active_urbs &= ~(1 << urb_index);
 287         if (unlikely(ep->drain_urbs)) {
 288                 ep->drain_urbs &= ~(1 << urb_index);
 289                 wake_up(&ep->drain_wait);
 290         }
 291         spin_unlock(&ep->buffer_lock);
 292         if (urb->status < 0) {
 293                 int err = snd_usbmidi_urb_error(urb->status);
 294                 if (err < 0) {
 295                         if (err != -ENODEV)
 296                                 mod_timer(&ep->umidi->error_timer,
 297                                           jiffies + ERROR_DELAY_JIFFIES);
 298                         return;
 299                 }
 300         }
 301         snd_usbmidi_do_output(ep);
 302 }
 303
 304 /*
 305  * This is called when some data should be transferred to the device
 306  * (from one or more substreams).
 307  */
 308 static void snd_usbmidi_do_output(struct snd_usb_midi_out_endpoint* ep)
 309 {
 310         unsigned int urb_index;
 311         struct urb* urb;
 312         unsigned long flags;
 313
 314         spin_lock_irqsave(&ep->buffer_lock, flags);
 315         if (ep->umidi->disconnected) {
 316                 spin_unlock_irqrestore(&ep->buffer_lock, flags);
 317                 return;
 318         }
 319
 320         urb_index = ep->next_urb;
 321         for (;;) {
 322                 if (!(ep->active_urbs & (1 << urb_index))) {
 323                         urb = ep->urbs[urb_index].urb;
 324                         urb->transfer_buffer_length = 0;
 325                         ep->umidi->usb_protocol_ops->output(ep, urb);
 326                         if (urb->transfer_buffer_length == 0)
 327                                 break;
 328
 329                         dump_urb("sending", urb->transfer_buffer,
 330                                  urb->transfer_buffer_length);
 331                         urb->dev = ep->umidi->dev;
 332                         if (snd_usbmidi_submit_urb(urb, GFP_ATOMIC) < 0)
 333                                 break;
 334                         ep->active_urbs |= 1 << urb_index;
 335                 }
 336                 if (++urb_index >= OUTPUT_URBS)
 337                         urb_index = 0;
 338                 if (urb_index == ep->next_urb)
 339                         break;
 340         }
 341         ep->next_urb = urb_index;
 342         spin_unlock_irqrestore(&ep->buffer_lock, flags);
 343 }
 344
 345 static void snd_usbmidi_out_tasklet(unsigned long data)
 346 {
 347         struct snd_usb_midi_out_endpoint* ep = (struct snd_usb_midi_out_endpoint *) data;
 348
 349         snd_usbmidi_do_output(ep);
 350 }
 351
 352 /* called after transfers had been interrupted due to some USB error */
 353 static void snd_usbmidi_error_timer(unsigned long data)
 354 {
 355         struct snd_usb_midi *umidi = (struct snd_usb_midi *)data;
 356         unsigned int i, j;
 357
 358         spin_lock(&umidi->disc_lock);
 359         if (umidi->disconnected) {
 360                 spin_unlock(&umidi->disc_lock);
 361                 return;
 362         }
 363         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
 364                 struct snd_usb_midi_in_endpoint *in = umidi->endpoints[i].in;
 365                 if (in && in->error_resubmit) {
 366                         in->error_resubmit = 0;
 367                         for (j = 0; j < INPUT_URBS; ++j) {
 368                                 in->urbs[j]->dev = umidi->dev;
 369                                 snd_usbmidi_submit_urb(in->urbs[j], GFP_ATOMIC);
 370                         }
 371                 }
 372                 if (umidi->endpoints[i].out)
 373                         snd_usbmidi_do_output(umidi->endpoints[i].out);
 374         }
 375         spin_unlock(&umidi->disc_lock);
 376 }
 377
 378 /* helper function to send static data that may not DMA-able */
 379 static int send_bulk_static_data(struct snd_usb_midi_out_endpoint* ep,
 380                                  const void *data, int len)
 381 {
 382         int err = 0;
 383         void *buf = kmemdup(data, len, GFP_KERNEL);
 384         if (!buf)
 385                 return -ENOMEM;
 386         dump_urb("sending", buf, len);
 387         if (ep->urbs[0].urb)
 388                 err = usb_bulk_msg(ep->umidi->dev, ep->urbs[0].urb->pipe,
 389                                    buf, len, NULL, 250);
 390         kfree(buf);
 391         return err;
 392 }
 393
 394 /*
 395  * Standard USB MIDI protocol: see the spec.
 396  * Midiman protocol: like the standard protocol, but the control byte is the
 397  * fourth byte in each packet, and uses length instead of CIN.
 398  */
 399
 400 static void snd_usbmidi_standard_input(struct snd_usb_midi_in_endpoint* ep,
 401                                        uint8_t* buffer, int buffer_length)
 402 {
 403         int i;
 404
 405         for (i = 0; i + 3 < buffer_length; i += 4)
 406                 if (buffer[i] != 0) {
 407                         int cable = buffer[i] >> 4;
 408                         int length = snd_usbmidi_cin_length[buffer[i] & 0x0f];
 409                         snd_usbmidi_input_data(ep, cable, &buffer[i + 1], length);
 410                 }
 411 }
 412
 413 static void snd_usbmidi_midiman_input(struct snd_usb_midi_in_endpoint* ep,
 414                                       uint8_t* buffer, int buffer_length)
 415 {
 416         int i;
 417
 418         for (i = 0; i + 3 < buffer_length; i += 4)
 419                 if (buffer[i + 3] != 0) {
 420                         int port = buffer[i + 3] >> 4;
 421                         int length = buffer[i + 3] & 3;
 422                         snd_usbmidi_input_data(ep, port, &buffer[i], length);
 423                 }
 424 }
 425
 426 /*
 427  * Buggy M-Audio device: running status on input results in a packet that has
 428  * the data bytes but not the status byte and that is marked with CIN 4.
 429  */
 430 static void snd_usbmidi_maudio_broken_running_status_input(
 431                                         struct snd_usb_midi_in_endpoint* ep,
 432                                         uint8_t* buffer, int buffer_length)
 433 {
 434         int i;
 435
 436         for (i = 0; i + 3 < buffer_length; i += 4)
 437                 if (buffer[i] != 0) {
 438                         int cable = buffer[i] >> 4;
 439                         u8 cin = buffer[i] & 0x0f;
 440                         struct usbmidi_in_port *port = &ep->ports[cable];
 441                         int length;
 442
 443                         length = snd_usbmidi_cin_length[cin];
 444                         if (cin == 0xf && buffer[i + 1] >= 0xf8)
 445                                 ; /* realtime msg: no running status change */
 446                         else if (cin >= 0x8 && cin <= 0xe)
 447                                 /* channel msg */
 448                                 port->running_status_length = length - 1;
 449                         else if (cin == 0x4 &&
 450                                  port->running_status_length != 0 &&
 451                                  buffer[i + 1] < 0x80)
 452                                 /* CIN 4 that is not a SysEx */
 453                                 length = port->running_status_length;
 454                         else
 455                                 /*
 456                                  * All other msgs cannot begin running status.
 457                                  * (A channel msg sent as two or three CIN 0xF
 458                                  * packets could in theory, but this device
 459                                  * doesn't use this format.)
 460                                  */
 461                                 port->running_status_length = 0;
 462                         snd_usbmidi_input_data(ep, cable, &buffer[i + 1], length);
 463                 }
 464 }
 465
 466 /*
 467  * CME protocol: like the standard protocol, but SysEx commands are sent as a
 468  * single USB packet preceded by a 0x0F byte.
 469  */
 470 static void snd_usbmidi_cme_input(struct snd_usb_midi_in_endpoint *ep,
 471                                   uint8_t *buffer, int buffer_length)
 472 {
 473         if (buffer_length < 2 || (buffer[0] & 0x0f) != 0x0f)
 474                 snd_usbmidi_standard_input(ep, buffer, buffer_length);
 475         else
 476                 snd_usbmidi_input_data(ep, buffer[0] >> 4,
 477                                        &buffer[1], buffer_length - 1);
 478 }
 479
 480 /*
 481  * Adds one USB MIDI packet to the output buffer.
 482  */
 483 static void snd_usbmidi_output_standard_packet(struct urb* urb, uint8_t p0,
 484                                                uint8_t p1, uint8_t p2, uint8_t p3)
 485 {
 486
 487         uint8_t* buf = (uint8_t*)urb->transfer_buffer + urb->transfer_buffer_length;
 488         buf[0] = p0;
 489         buf[1] = p1;
 490         buf[2] = p2;
 491         buf[3] = p3;
 492         urb->transfer_buffer_length += 4;
 493 }
 494
 495 /*
 496  * Adds one Midiman packet to the output buffer.
 497  */
 498 static void snd_usbmidi_output_midiman_packet(struct urb* urb, uint8_t p0,
 499                                               uint8_t p1, uint8_t p2, uint8_t p3)
 500 {
 501
 502         uint8_t* buf = (uint8_t*)urb->transfer_buffer + urb->transfer_buffer_length;
 503         buf[0] = p1;
 504         buf[1] = p2;
 505         buf[2] = p3;
 506         buf[3] = (p0 & 0xf0) | snd_usbmidi_cin_length[p0 & 0x0f];
 507         urb->transfer_buffer_length += 4;
 508 }
 509
 510 /*
 511  * Converts MIDI commands to USB MIDI packets.
 512  */
 513 static void snd_usbmidi_transmit_byte(struct usbmidi_out_port* port,
 514                                       uint8_t b, struct urb* urb)
 515 {
 516         uint8_t p0 = port->cable;
 517         void (*output_packet)(struct urb*, uint8_t, uint8_t, uint8_t, uint8_t) =
 518                 port->ep->umidi->usb_protocol_ops->output_packet;
 519
 520         if (b >= 0xf8) {
 521                 output_packet(urb, p0 | 0x0f, b, 0, 0);
 522         } else if (b >= 0xf0) {
 523                 switch (b) {
 524                 case 0xf0:
 525                         port->data[0] = b;
 526                         port->state = STATE_SYSEX_1;
 527                         break;
 528                 case 0xf1:
 529                 case 0xf3:
 530                         port->data[0] = b;
 531                         port->state = STATE_1PARAM;
 532                         break;
 533                 case 0xf2:
 534                         port->data[0] = b;
 535                         port->state = STATE_2PARAM_1;
 536                         break;
 537                 case 0xf4:
 538                 case 0xf5:
 539                         port->state = STATE_UNKNOWN;
 540                         break;
 541                 case 0xf6:
 542                         output_packet(urb, p0 | 0x05, 0xf6, 0, 0);
 543                         port->state = STATE_UNKNOWN;
 544                         break;
 545                 case 0xf7:
 546                         switch (port->state) {
 547                         case STATE_SYSEX_0:
 548                                 output_packet(urb, p0 | 0x05, 0xf7, 0, 0);
 549                                 break;
 550                         case STATE_SYSEX_1:
 551                                 output_packet(urb, p0 | 0x06, port->data[0], 0xf7, 0);
 552                                 break;
 553                         case STATE_SYSEX_2:
 554                                 output_packet(urb, p0 | 0x07, port->data[0], port->data[1], 0xf7);
 555                                 break;
 556                         }
 557                         port->state = STATE_UNKNOWN;
 558                         break;
 559                 }
 560         } else if (b >= 0x80) {
 561                 port->data[0] = b;
 562                 if (b >= 0xc0 && b <= 0xdf)
 563                         port->state = STATE_1PARAM;
 564                 else
 565                         port->state = STATE_2PARAM_1;
 566         } else { /* b < 0x80 */
 567                 switch (port->state) {
 568                 case STATE_1PARAM:
 569                         if (port->data[0] < 0xf0) {
 570                                 p0 |= port->data[0] >> 4;
 571                         } else {
 572                                 p0 |= 0x02;
 573                                 port->state = STATE_UNKNOWN;
 574                         }
 575                         output_packet(urb, p0, port->data[0], b, 0);
 576                         break;
 577                 case STATE_2PARAM_1:
 578                         port->data[1] = b;
 579                         port->state = STATE_2PARAM_2;
 580                         break;
 581                 case STATE_2PARAM_2:
 582                         if (port->data[0] < 0xf0) {
 583                                 p0 |= port->data[0] >> 4;
 584                                 port->state = STATE_2PARAM_1;
 585                         } else {
 586                                 p0 |= 0x03;
 587                                 port->state = STATE_UNKNOWN;
 588                         }
 589                         output_packet(urb, p0, port->data[0], port->data[1], b);
 590                         break;
 591                 case STATE_SYSEX_0:
 592                         port->data[0] = b;
 593                         port->state = STATE_SYSEX_1;
 594                         break;
 595                 case STATE_SYSEX_1:
 596                         port->data[1] = b;
 597                         port->state = STATE_SYSEX_2;
 598                         break;
 599                 case STATE_SYSEX_2:
 600                         output_packet(urb, p0 | 0x04, port->data[0], port->data[1], b);
 601                         port->state = STATE_SYSEX_0;
 602                         break;
 603                 }
 604         }
 605 }
 606
 607 static void snd_usbmidi_standard_output(struct snd_usb_midi_out_endpoint* ep,
 608                                         struct urb *urb)
 609 {
 610         int p;
 611
 612         /* FIXME: lower-numbered ports can starve higher-numbered ports */
 613         for (p = 0; p < 0x10; ++p) {
 614                 struct usbmidi_out_port* port = &ep->ports[p];
 615                 if (!port->active)
 616                         continue;
 617                 while (urb->transfer_buffer_length + 3 < ep->max_transfer) {
 618                         uint8_t b;
 619                         if (snd_rawmidi_transmit(port->substream, &b, 1) != 1) {
 620                                 port->active = 0;
 621                                 break;
 622                         }
 623                         snd_usbmidi_transmit_byte(port, b, urb);
 624                 }
 625         }
 626 }
 627
 628 static struct usb_protocol_ops snd_usbmidi_standard_ops = {
 629         .input = snd_usbmidi_standard_input,
 630         .output = snd_usbmidi_standard_output,
 631         .output_packet = snd_usbmidi_output_standard_packet,
 632 };
 633
 634 static struct usb_protocol_ops snd_usbmidi_midiman_ops = {
 635         .input = snd_usbmidi_midiman_input,
 636         .output = snd_usbmidi_standard_output,
 637         .output_packet = snd_usbmidi_output_midiman_packet,
 638 };
 639
 640 static struct usb_protocol_ops snd_usbmidi_maudio_broken_running_status_ops = {
 641         .input = snd_usbmidi_maudio_broken_running_status_input,
 642         .output = snd_usbmidi_standard_output,
 643         .output_packet = snd_usbmidi_output_standard_packet,
 644 };
 645
 646 static struct usb_protocol_ops snd_usbmidi_cme_ops = {
 647         .input = snd_usbmidi_cme_input,
 648         .output = snd_usbmidi_standard_output,
 649         .output_packet = snd_usbmidi_output_standard_packet,
 650 };
 651
 652 /*
 653  * AKAI MPD16 protocol:
 654  *
 655  * For control port (endpoint 1):
 656  * ==============================
 657  * One or more chunks consisting of first byte of (0x10 | msg_len) and then a
 658  * SysEx message (msg_len=9 bytes long).
 659  *
 660  * For data port (endpoint 2):
 661  * ===========================
 662  * One or more chunks consisting of first byte of (0x20 | msg_len) and then a
 663  * MIDI message (msg_len bytes long)
 664  *
 665  * Messages sent: Active Sense, Note On, Poly Pressure, Control Change.
 666  */
 667 static void snd_usbmidi_akai_input(struct snd_usb_midi_in_endpoint *ep,
 668                                    uint8_t *buffer, int buffer_length)
 669 {
 670         unsigned int pos = 0;
 671         unsigned int len = (unsigned int)buffer_length;
 672         while (pos < len) {
 673                 unsigned int port = (buffer[pos] >> 4) - 1;
 674                 unsigned int msg_len = buffer[pos] & 0x0f;
 675                 pos++;
 676                 if (pos + msg_len <= len && port < 2)
 677                         snd_usbmidi_input_data(ep, 0, &buffer[pos], msg_len);
 678                 pos += msg_len;
 679         }
 680 }
 681
 682 #define MAX_AKAI_SYSEX_LEN 9
 683
 684 static void snd_usbmidi_akai_output(struct snd_usb_midi_out_endpoint *ep,
 685                                     struct urb *urb)
 686 {
 687         uint8_t *msg;
 688         int pos, end, count, buf_end;
 689         uint8_t tmp[MAX_AKAI_SYSEX_LEN];
 690         struct snd_rawmidi_substream *substream = ep->ports[0].substream;
 691
 692         if (!ep->ports[0].active)
 693                 return;
 694
 695         msg = urb->transfer_buffer + urb->transfer_buffer_length;
 696         buf_end = ep->max_transfer - MAX_AKAI_SYSEX_LEN - 1;
 697
 698         /* only try adding more data when there's space for at least 1 SysEx */
 699         while (urb->transfer_buffer_length < buf_end) {
 700                 count = snd_rawmidi_transmit_peek(substream,
 701                                                   tmp, MAX_AKAI_SYSEX_LEN);
 702                 if (!count) {
 703                         ep->ports[0].active = 0;
 704                         return;
 705                 }
 706                 /* try to skip non-SysEx data */
 707                 for (pos = 0; pos < count && tmp[pos] != 0xF0; pos++)
 708                         ;
 709
 710                 if (pos > 0) {
 711                         snd_rawmidi_transmit_ack(substream, pos);
 712                         continue;
 713                 }
 714
 715                 /* look for the start or end marker */
 716                 for (end = 1; end < count && tmp[end] < 0xF0; end++)
 717                         ;
 718
 719                 /* next SysEx started before the end of current one */
 720                 if (end < count && tmp[end] == 0xF0) {
 721                         /* it's incomplete - drop it */
 722                         snd_rawmidi_transmit_ack(substream, end);
 723                         continue;
 724                 }
 725                 /* SysEx complete */
 726                 if (end < count && tmp[end] == 0xF7) {
 727                         /* queue it, ack it, and get the next one */
 728                         count = end + 1;
 729                         msg[0] = 0x10 | count;
 730                         memcpy(&msg[1], tmp, count);
 731                         snd_rawmidi_transmit_ack(substream, count);
 732                         urb->transfer_buffer_length += count + 1;
 733                         msg += count + 1;
 734                         continue;
 735                 }
 736                 /* less than 9 bytes and no end byte - wait for more */
 737                 if (count < MAX_AKAI_SYSEX_LEN) {
 738                         ep->ports[0].active = 0;
 739                         return;
 740                 }
 741                 /* 9 bytes and no end marker in sight - malformed, skip it */
 742                 snd_rawmidi_transmit_ack(substream, count);
 743         }
 744 }
 745
 746 static struct usb_protocol_ops snd_usbmidi_akai_ops = {
 747         .input = snd_usbmidi_akai_input,
 748         .output = snd_usbmidi_akai_output,
 749 };
 750
 751 /*
 752  * Novation USB MIDI protocol: number of data bytes is in the first byte
 753  * (when receiving) (+1!) or in the second byte (when sending); data begins
 754  * at the third byte.
 755  */
 756
 757 static void snd_usbmidi_novation_input(struct snd_usb_midi_in_endpoint* ep,
 758                                        uint8_t* buffer, int buffer_length)
 759 {
 760         if (buffer_length < 2 || !buffer[0] || buffer_length < buffer[0] + 1)
 761                 return;
 762         snd_usbmidi_input_data(ep, 0, &buffer[2], buffer[0] - 1);
 763 }
 764
 765 static void snd_usbmidi_novation_output(struct snd_usb_midi_out_endpoint* ep,
 766                                         struct urb *urb)
 767 {
 768         uint8_t* transfer_buffer;
 769         int count;
 770
 771         if (!ep->ports[0].active)
 772                 return;
 773         transfer_buffer = urb->transfer_buffer;
 774         count = snd_rawmidi_transmit(ep->ports[0].substream,
 775                                      &transfer_buffer[2],
 776                                      ep->max_transfer - 2);
 777         if (count < 1) {
 778                 ep->ports[0].active = 0;
 779                 return;
 780         }
 781         transfer_buffer[0] = 0;
 782         transfer_buffer[1] = count;
 783         urb->transfer_buffer_length = 2 + count;
 784 }
 785
 786 static struct usb_protocol_ops snd_usbmidi_novation_ops = {
 787         .input = snd_usbmidi_novation_input,
 788         .output = snd_usbmidi_novation_output,
 789 };
 790
 791 /*
 792  * "raw" protocol: just move raw MIDI bytes from/to the endpoint
 793  */
 794
 795 static void snd_usbmidi_raw_input(struct snd_usb_midi_in_endpoint* ep,
 796                                   uint8_t* buffer, int buffer_length)
 797 {
 798         snd_usbmidi_input_data(ep, 0, buffer, buffer_length);
 799 }
 800
 801 static void snd_usbmidi_raw_output(struct snd_usb_midi_out_endpoint* ep,
 802                                    struct urb *urb)
 803 {
 804         int count;
 805
 806         if (!ep->ports[0].active)
 807                 return;
 808         count = snd_rawmidi_transmit(ep->ports[0].substream,
 809                                      urb->transfer_buffer,
 810                                      ep->max_transfer);
 811         if (count < 1) {
 812                 ep->ports[0].active = 0;
 813                 return;
 814         }
 815         urb->transfer_buffer_length = count;
 816 }
 817
 818 static struct usb_protocol_ops snd_usbmidi_raw_ops = {
 819         .input = snd_usbmidi_raw_input,
 820         .output = snd_usbmidi_raw_output,
 821 };
 822
 823 /*
 824  * FTDI protocol: raw MIDI bytes, but input packets have two modem status bytes.
 825  */
 826
 827 static void snd_usbmidi_ftdi_input(struct snd_usb_midi_in_endpoint* ep,
 828                                    uint8_t* buffer, int buffer_length)
 829 {
 830         if (buffer_length > 2)
 831                 snd_usbmidi_input_data(ep, 0, buffer + 2, buffer_length - 2);
 832 }
 833
 834 static struct usb_protocol_ops snd_usbmidi_ftdi_ops = {
 835         .input = snd_usbmidi_ftdi_input,
 836         .output = snd_usbmidi_raw_output,
 837 };
 838
 839 static void snd_usbmidi_us122l_input(struct snd_usb_midi_in_endpoint *ep,
 840                                      uint8_t *buffer, int buffer_length)
 841 {
 842         if (buffer_length != 9)
 843                 return;
 844         buffer_length = 8;
 845         while (buffer_length && buffer[buffer_length - 1] == 0xFD)
 846                 buffer_length--;
 847         if (buffer_length)
 848                 snd_usbmidi_input_data(ep, 0, buffer, buffer_length);
 849 }
 850
 851 static void snd_usbmidi_us122l_output(struct snd_usb_midi_out_endpoint *ep,
 852                                       struct urb *urb)
 853 {
 854         int count;
 855
 856         if (!ep->ports[0].active)
 857                 return;
 858         switch (snd_usb_get_speed(ep->umidi->dev)) {
 859         case USB_SPEED_HIGH:
 860         case USB_SPEED_SUPER:
 861                 count = 1;
 862                 break;
 863         default:
 864                 count = 2;
 865         }
 866         count = snd_rawmidi_transmit(ep->ports[0].substream,
 867                                      urb->transfer_buffer,
 868                                      count);
 869         if (count < 1) {
 870                 ep->ports[0].active = 0;
 871                 return;
 872         }
 873
 874         memset(urb->transfer_buffer + count, 0xFD, ep->max_transfer - count);
 875         urb->transfer_buffer_length = ep->max_transfer;
 876 }
 877
 878 static struct usb_protocol_ops snd_usbmidi_122l_ops = {
 879         .input = snd_usbmidi_us122l_input,
 880         .output = snd_usbmidi_us122l_output,
 881 };
 882
 883 /*
 884  * Emagic USB MIDI protocol: raw MIDI with "F5 xx" port switching.
 885  */
 886
 887 static void snd_usbmidi_emagic_init_out(struct snd_usb_midi_out_endpoint* ep)
 888 {
 889         static const u8 init_data[] = {
 890                 /* initialization magic: "get version" */
 891                 0xf0,
 892                 0x00, 0x20, 0x31,       /* Emagic */
 893                 0x64,                   /* Unitor8 */
 894                 0x0b,                   /* version number request */
 895                 0x00,                   /* command version */
 896                 0x00,                   /* EEPROM, box 0 */
 897                 0xf7
 898         };
 899         send_bulk_static_data(ep, init_data, sizeof(init_data));
 900         /* while we're at it, pour on more magic */
 901         send_bulk_static_data(ep, init_data, sizeof(init_data));
 902 }
 903
 904 static void snd_usbmidi_emagic_finish_out(struct snd_usb_midi_out_endpoint* ep)
 905 {
 906         static const u8 finish_data[] = {
 907                 /* switch to patch mode with last preset */
 908                 0xf0,
 909                 0x00, 0x20, 0x31,       /* Emagic */
 910                 0x64,                   /* Unitor8 */
 911                 0x10,                   /* patch switch command */
 912                 0x00,                   /* command version */
 913                 0x7f,                   /* to all boxes */
 914                 0x40,                   /* last preset in EEPROM */
 915                 0xf7
 916         };
 917         send_bulk_static_data(ep, finish_data, sizeof(finish_data));
 918 }
 919
 920 static void snd_usbmidi_emagic_input(struct snd_usb_midi_in_endpoint* ep,
 921                                      uint8_t* buffer, int buffer_length)
 922 {
 923         int i;
 924
 925         /* FF indicates end of valid data */
 926         for (i = 0; i < buffer_length; ++i)
 927                 if (buffer[i] == 0xff) {
 928                         buffer_length = i;
 929                         break;
 930                 }
 931
 932         /* handle F5 at end of last buffer */
 933         if (ep->seen_f5)
 934                 goto switch_port;
 935
 936         while (buffer_length > 0) {
 937                 /* determine size of data until next F5 */
 938                 for (i = 0; i < buffer_length; ++i)
 939                         if (buffer[i] == 0xf5)
 940                                 break;
 941                 snd_usbmidi_input_data(ep, ep->current_port, buffer, i);
 942                 buffer += i;
 943                 buffer_length -= i;
 944
 945                 if (buffer_length <= 0)
 946                         break;
 947                 /* assert(buffer[0] == 0xf5); */
 948                 ep->seen_f5 = 1;
 949                 ++buffer;
 950                 --buffer_length;
 951
 952         switch_port:
 953                 if (buffer_length <= 0)
 954                         break;
 955                 if (buffer[0] < 0x80) {
 956                         ep->current_port = (buffer[0] - 1) & 15;
 957                         ++buffer;
 958                         --buffer_length;
 959                 }
 960                 ep->seen_f5 = 0;
 961         }
 962 }
 963
 964 static void snd_usbmidi_emagic_output(struct snd_usb_midi_out_endpoint* ep,
 965                                       struct urb *urb)
 966 {
 967         int port0 = ep->current_port;
 968         uint8_t* buf = urb->transfer_buffer;
 969         int buf_free = ep->max_transfer;
 970         int length, i;
 971
 972         for (i = 0; i < 0x10; ++i) {
 973                 /* round-robin, starting at the last current port */
 974                 int portnum = (port0 + i) & 15;
 975                 struct usbmidi_out_port* port = &ep->ports[portnum];
 976
 977                 if (!port->active)
 978                         continue;
 979                 if (snd_rawmidi_transmit_peek(port->substream, buf, 1) != 1) {
 980                         port->active = 0;
 981                         continue;
 982                 }
 983
 984                 if (portnum != ep->current_port) {
 985                         if (buf_free < 2)
 986                                 break;
 987                         ep->current_port = portnum;
 988                         buf[0] = 0xf5;
 989                         buf[1] = (portnum + 1) & 15;
 990                         buf += 2;
 991                         buf_free -= 2;
 992                 }
 993
 994                 if (buf_free < 1)
 995                         break;
 996                 length = snd_rawmidi_transmit(port->substream, buf, buf_free);
 997                 if (length > 0) {
 998                         buf += length;
 999                         buf_free -= length;
1000                         if (buf_free < 1)
1001                                 break;
1002                 }
1003         }
1004         if (buf_free < ep->max_transfer && buf_free > 0) {
1005                 *buf = 0xff;
1006                 --buf_free;
1007         }
1008         urb->transfer_buffer_length = ep->max_transfer - buf_free;
1009 }
1010
1011 static struct usb_protocol_ops snd_usbmidi_emagic_ops = {
1012         .input = snd_usbmidi_emagic_input,
1013         .output = snd_usbmidi_emagic_output,
1014         .init_out_endpoint = snd_usbmidi_emagic_init_out,
1015         .finish_out_endpoint = snd_usbmidi_emagic_finish_out,
1016 };
1017
1018
1019 static void update_roland_altsetting(struct snd_usb_midi* umidi)
1020 {
1021         struct usb_interface *intf;
1022         struct usb_host_interface *hostif;
1023         struct usb_interface_descriptor *intfd;
1024         int is_light_load;
1025
1026         intf = umidi->iface;
1027         is_light_load = intf->cur_altsetting != intf->altsetting;
1028         if (umidi->roland_load_ctl->private_value == is_light_load)
1029                 return;
1030         hostif = &intf->altsetting[umidi->roland_load_ctl->private_value];
1031         intfd = get_iface_desc(hostif);
1032         snd_usbmidi_input_stop(&umidi->list);
1033         usb_set_interface(umidi->dev, intfd->bInterfaceNumber,
1034                           intfd->bAlternateSetting);
1035         snd_usbmidi_input_start(&umidi->list);
1036 }
1037
1038 static int substream_open(struct snd_rawmidi_substream *substream, int dir,
1039                           int open)
1040 {
1041         struct snd_usb_midi* umidi = substream->rmidi->private_data;
1042         struct snd_kcontrol *ctl;
1043         int err;
1044
1045         down_read(&umidi->disc_rwsem);
1046         if (umidi->disconnected) {
1047                 up_read(&umidi->disc_rwsem);
1048                 return open ? -ENODEV : 0;
1049         }
1050
1051         mutex_lock(&umidi->mutex);
1052         if (open) {
1053                 if (!umidi->opened[0] && !umidi->opened[1]) {
1054                         err = usb_autopm_get_interface(umidi->iface);
1055                         umidi->autopm_reference = err >= 0;
1056                         if (err < 0 && err != -EACCES) {
1057                                 mutex_unlock(&umidi->mutex);
1058                                 up_read(&umidi->disc_rwsem);
1059                                 return -EIO;
1060                         }
1061                         if (umidi->roland_load_ctl) {
1062                                 ctl = umidi->roland_load_ctl;
1063                                 ctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
1064                                 snd_ctl_notify(umidi->card,
1065                                        SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
1066                                 update_roland_altsetting(umidi);
1067                         }
1068                 }
1069                 umidi->opened[dir]++;
1070                 if (umidi->opened[1])
1071                         snd_usbmidi_input_start(&umidi->list);
1072         } else {
1073                 umidi->opened[dir]--;
1074                 if (!umidi->opened[1])
1075                         snd_usbmidi_input_stop(&umidi->list);
1076                 if (!umidi->opened[0] && !umidi->opened[1]) {
1077                         if (umidi->roland_load_ctl) {
1078                                 ctl = umidi->roland_load_ctl;
1079                                 ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
1080                                 snd_ctl_notify(umidi->card,
1081                                        SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
1082                         }
1083                         if (umidi->autopm_reference)
1084                                 usb_autopm_put_interface(umidi->iface);
1085                 }
1086         }
1087         mutex_unlock(&umidi->mutex);
1088         up_read(&umidi->disc_rwsem);
1089         return 0;
1090 }
1091
1092 static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
1093 {
1094         struct snd_usb_midi* umidi = substream->rmidi->private_data;
1095         struct usbmidi_out_port* port = NULL;
1096         int i, j;
1097
1098         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
1099                 if (umidi->endpoints[i].out)
1100                         for (j = 0; j < 0x10; ++j)
1101                                 if (umidi->endpoints[i].out->ports[j].substream == substream) {
1102                                         port = &umidi->endpoints[i].out->ports[j];
1103                                         break;
1104                                 }
1105         if (!port) {
1106                 snd_BUG();
1107                 return -ENXIO;
1108         }
1109
1110         substream->runtime->private_data = port;
1111         port->state = STATE_UNKNOWN;
1112         return substream_open(substream, 0, 1);
1113 }
1114
1115 static int snd_usbmidi_output_close(struct snd_rawmidi_substream *substream)
1116 {
1117         return substream_open(substream, 0, 0);
1118 }
1119
1120 static void snd_usbmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
1121 {
1122         struct usbmidi_out_port* port = (struct usbmidi_out_port*)substream->runtime->private_data;
1123
1124         port->active = up;
1125         if (up) {
1126                 if (port->ep->umidi->disconnected) {
1127                         /* gobble up remaining bytes to prevent wait in
1128                          * snd_rawmidi_drain_output */
1129                         while (!snd_rawmidi_transmit_empty(substream))
1130                                 snd_rawmidi_transmit_ack(substream, 1);
1131                         return;
1132                 }
1133                 tasklet_schedule(&port->ep->tasklet);
1134         }
1135 }
1136
1137 static void snd_usbmidi_output_drain(struct snd_rawmidi_substream *substream)
1138 {
1139         struct usbmidi_out_port* port = substream->runtime->private_data;
1140         struct snd_usb_midi_out_endpoint *ep = port->ep;
1141         unsigned int drain_urbs;
1142         DEFINE_WAIT(wait);
1143         long timeout = msecs_to_jiffies(50);
1144
1145         if (ep->umidi->disconnected)
1146                 return;
1147         /*
1148          * The substream buffer is empty, but some data might still be in the
1149          * currently active URBs, so we have to wait for those to complete.
1150          */
1151         spin_lock_irq(&ep->buffer_lock);
1152         drain_urbs = ep->active_urbs;
1153         if (drain_urbs) {
1154                 ep->drain_urbs |= drain_urbs;
1155                 do {
1156                         prepare_to_wait(&ep->drain_wait, &wait,
1157                                         TASK_UNINTERRUPTIBLE);
1158                         spin_unlock_irq(&ep->buffer_lock);
1159                         timeout = schedule_timeout(timeout);
1160                         spin_lock_irq(&ep->buffer_lock);
1161                         drain_urbs &= ep->drain_urbs;
1162                 } while (drain_urbs && timeout);
1163                 finish_wait(&ep->drain_wait, &wait);
1164         }
1165         spin_unlock_irq(&ep->buffer_lock);
1166 }
1167
1168 static int snd_usbmidi_input_open(struct snd_rawmidi_substream *substream)
1169 {
1170         return substream_open(substream, 1, 1);
1171 }
1172
1173 static int snd_usbmidi_input_close(struct snd_rawmidi_substream *substream)
1174 {
1175         return substream_open(substream, 1, 0);
1176 }
1177
1178 static void snd_usbmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
1179 {
1180         struct snd_usb_midi* umidi = substream->rmidi->private_data;
1181
1182         if (up)
1183                 set_bit(substream->number, &umidi->input_triggered);
1184         else
1185                 clear_bit(substream->number, &umidi->input_triggered);
1186 }
1187
1188 static struct snd_rawmidi_ops snd_usbmidi_output_ops = {
1189         .open = snd_usbmidi_output_open,
1190         .close = snd_usbmidi_output_close,
1191         .trigger = snd_usbmidi_output_trigger,
1192         .drain = snd_usbmidi_output_drain,
1193 };
1194
1195 static struct snd_rawmidi_ops snd_usbmidi_input_ops = {
1196         .open = snd_usbmidi_input_open,
1197         .close = snd_usbmidi_input_close,
1198         .trigger = snd_usbmidi_input_trigger
1199 };
1200
1201 static void free_urb_and_buffer(struct snd_usb_midi *umidi, struct urb *urb,
1202                                 unsigned int buffer_length)
1203 {
1204         usb_free_coherent(umidi->dev, buffer_length,
1205                           urb->transfer_buffer, urb->transfer_dma);
1206         usb_free_urb(urb);
1207 }
1208
1209 /*
1210  * Frees an input endpoint.
1211  * May be called when ep hasn't been initialized completely.
1212  */
1213 static void snd_usbmidi_in_endpoint_delete(struct snd_usb_midi_in_endpoint* ep)
1214 {
1215         unsigned int i;
1216
1217         for (i = 0; i < INPUT_URBS; ++i)
1218                 if (ep->urbs[i])
1219                         free_urb_and_buffer(ep->umidi, ep->urbs[i],
1220                                             ep->urbs[i]->transfer_buffer_length);
1221         kfree(ep);
1222 }
1223
1224 /*
1225  * Creates an input endpoint.
1226  */
1227 static int snd_usbmidi_in_endpoint_create(struct snd_usb_midi* umidi,
1228                                           struct snd_usb_midi_endpoint_info* ep_info,
1229                                           struct snd_usb_midi_endpoint* rep)
1230 {
1231         struct snd_usb_midi_in_endpoint* ep;
1232         void* buffer;
1233         unsigned int pipe;
1234         int length;
1235         unsigned int i;
1236
1237         rep->in = NULL;
1238         ep = kzalloc(sizeof(*ep), GFP_KERNEL);
1239         if (!ep)
1240                 return -ENOMEM;
1241         ep->umidi = umidi;
1242
1243         for (i = 0; i < INPUT_URBS; ++i) {
1244                 ep->urbs[i] = usb_alloc_urb(0, GFP_KERNEL);
1245                 if (!ep->urbs[i]) {
1246                         snd_usbmidi_in_endpoint_delete(ep);
1247                         return -ENOMEM;
1248                 }
1249         }
1250         if (ep_info->in_interval)
1251                 pipe = usb_rcvintpipe(umidi->dev, ep_info->in_ep);
1252         else
1253                 pipe = usb_rcvbulkpipe(umidi->dev, ep_info->in_ep);
1254         length = usb_maxpacket(umidi->dev, pipe, 0);
1255         for (i = 0; i < INPUT_URBS; ++i) {
1256                 buffer = usb_alloc_coherent(umidi->dev, length, GFP_KERNEL,
1257                                             &ep->urbs[i]->transfer_dma);
1258                 if (!buffer) {
1259                         snd_usbmidi_in_endpoint_delete(ep);
1260                         return -ENOMEM;
1261                 }
1262                 if (ep_info->in_interval)
1263                         usb_fill_int_urb(ep->urbs[i], umidi->dev,
1264                                          pipe, buffer, length,
1265                                          snd_usbmidi_in_urb_complete,
1266                                          ep, ep_info->in_interval);
1267                 else
1268                         usb_fill_bulk_urb(ep->urbs[i], umidi->dev,
1269                                           pipe, buffer, length,
1270                                           snd_usbmidi_in_urb_complete, ep);
1271                 ep->urbs[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1272         }
1273
1274         rep->in = ep;
1275         return 0;
1276 }
1277
1278 /*
1279  * Frees an output endpoint.
1280  * May be called when ep hasn't been initialized completely.
1281  */
1282 static void snd_usbmidi_out_endpoint_clear(struct snd_usb_midi_out_endpoint *ep)
1283 {
1284         unsigned int i;
1285
1286         for (i = 0; i < OUTPUT_URBS; ++i)
1287                 if (ep->urbs[i].urb) {
1288                         free_urb_and_buffer(ep->umidi, ep->urbs[i].urb,
1289                                             ep->max_transfer);
1290                         ep->urbs[i].urb = NULL;
1291                 }
1292 }
1293
1294 static void snd_usbmidi_out_endpoint_delete(struct snd_usb_midi_out_endpoint *ep)
1295 {
1296         snd_usbmidi_out_endpoint_clear(ep);
1297         kfree(ep);
1298 }
1299
1300 /*
1301  * Creates an output endpoint, and initializes output ports.
1302  */
1303 static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi* umidi,
1304                                            struct snd_usb_midi_endpoint_info* ep_info,
1305                                            struct snd_usb_midi_endpoint* rep)
1306 {
1307         struct snd_usb_midi_out_endpoint* ep;
1308         unsigned int i;
1309         unsigned int pipe;
1310         void* buffer;
1311
1312         rep->out = NULL;
1313         ep = kzalloc(sizeof(*ep), GFP_KERNEL);
1314         if (!ep)
1315                 return -ENOMEM;
1316         ep->umidi = umidi;
1317
1318         for (i = 0; i < OUTPUT_URBS; ++i) {
1319                 ep->urbs[i].urb = usb_alloc_urb(0, GFP_KERNEL);
1320                 if (!ep->urbs[i].urb) {
1321                         snd_usbmidi_out_endpoint_delete(ep);
1322                         return -ENOMEM;
1323                 }
1324                 ep->urbs[i].ep = ep;
1325         }
1326         if (ep_info->out_interval)
1327                 pipe = usb_sndintpipe(umidi->dev, ep_info->out_ep);
1328         else
1329                 pipe = usb_sndbulkpipe(umidi->dev, ep_info->out_ep);
1330         switch (umidi->usb_id) {
1331         default:
1332                 ep->max_transfer = usb_maxpacket(umidi->dev, pipe, 1);
1333                 break;
1334                 /*
1335                  * Various chips declare a packet size larger than 4 bytes, but
1336                  * do not actually work with larger packets:
1337                  */
1338         case USB_ID(0x0a92, 0x1020): /* ESI M4U */
1339         case USB_ID(0x1430, 0x474b): /* RedOctane GH MIDI INTERFACE */
1340         case USB_ID(0x15ca, 0x0101): /* Textech USB Midi Cable */
1341         case USB_ID(0x15ca, 0x1806): /* Textech USB Midi Cable */
1342         case USB_ID(0x1a86, 0x752d): /* QinHeng CH345 "USB2.0-MIDI" */
1343         case USB_ID(0xfc08, 0x0101): /* Unknown vendor Cable */
1344                 ep->max_transfer = 4;
1345                 break;
1346                 /*
1347                  * Some devices only work with 9 bytes packet size:
1348                  */
1349         case USB_ID(0x0644, 0x800E): /* Tascam US-122L */
1350         case USB_ID(0x0644, 0x800F): /* Tascam US-144 */
1351                 ep->max_transfer = 9;
1352                 break;
1353         }
1354         for (i = 0; i < OUTPUT_URBS; ++i) {
1355                 buffer = usb_alloc_coherent(umidi->dev,
1356                                             ep->max_transfer, GFP_KERNEL,
1357                                             &ep->urbs[i].urb->transfer_dma);
1358                 if (!buffer) {
1359                         snd_usbmidi_out_endpoint_delete(ep);
1360                         return -ENOMEM;
1361                 }
1362                 if (ep_info->out_interval)
1363                         usb_fill_int_urb(ep->urbs[i].urb, umidi->dev,
1364                                          pipe, buffer, ep->max_transfer,
1365                                          snd_usbmidi_out_urb_complete,
1366                                          &ep->urbs[i], ep_info->out_interval);
1367                 else
1368                         usb_fill_bulk_urb(ep->urbs[i].urb, umidi->dev,
1369                                           pipe, buffer, ep->max_transfer,
1370                                           snd_usbmidi_out_urb_complete,
1371                                           &ep->urbs[i]);
1372                 ep->urbs[i].urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1373         }
1374
1375         spin_lock_init(&ep->buffer_lock);
1376         tasklet_init(&ep->tasklet, snd_usbmidi_out_tasklet, (unsigned long)ep);
1377         init_waitqueue_head(&ep->drain_wait);
1378
1379         for (i = 0; i < 0x10; ++i)
1380                 if (ep_info->out_cables & (1 << i)) {
1381                         ep->ports[i].ep = ep;
1382                         ep->ports[i].cable = i << 4;
1383                 }
1384
1385         if (umidi->usb_protocol_ops->init_out_endpoint)
1386                 umidi->usb_protocol_ops->init_out_endpoint(ep);
1387
1388         rep->out = ep;
1389         return 0;
1390 }
1391
1392 /*
1393  * Frees everything.
1394  */
1395 static void snd_usbmidi_free(struct snd_usb_midi* umidi)
1396 {
1397         int i;
1398
1399         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1400                 struct snd_usb_midi_endpoint* ep = &umidi->endpoints[i];
1401                 if (ep->out)
1402                         snd_usbmidi_out_endpoint_delete(ep->out);
1403                 if (ep->in)
1404                         snd_usbmidi_in_endpoint_delete(ep->in);
1405         }
1406         mutex_destroy(&umidi->mutex);
1407         kfree(umidi);
1408 }
1409
1410 /*
1411  * Unlinks all URBs (must be done before the usb_device is deleted).
1412  */
1413 void snd_usbmidi_disconnect(struct list_head* p)
1414 {
1415         struct snd_usb_midi* umidi;
1416         unsigned int i, j;
1417
1418         umidi = list_entry(p, struct snd_usb_midi, list);
1419         /*
1420          * an URB's completion handler may start the timer and
1421          * a timer may submit an URB. To reliably break the cycle
1422          * a flag under lock must be used
1423          */
1424         down_write(&umidi->disc_rwsem);
1425         spin_lock_irq(&umidi->disc_lock);
1426         umidi->disconnected = 1;
1427         spin_unlock_irq(&umidi->disc_lock);
1428         up_write(&umidi->disc_rwsem);
1429
1430         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1431                 struct snd_usb_midi_endpoint* ep = &umidi->endpoints[i];
1432                 if (ep->out)
1433                         tasklet_kill(&ep->out->tasklet);
1434                 if (ep->out) {
1435                         for (j = 0; j < OUTPUT_URBS; ++j)
1436                                 usb_kill_urb(ep->out->urbs[j].urb);
1437                         if (umidi->usb_protocol_ops->finish_out_endpoint)
1438                                 umidi->usb_protocol_ops->finish_out_endpoint(ep->out);
1439                         ep->out->active_urbs = 0;
1440                         if (ep->out->drain_urbs) {
1441                                 ep->out->drain_urbs = 0;
1442                                 wake_up(&ep->out->drain_wait);
1443                         }
1444                 }
1445                 if (ep->in)
1446                         for (j = 0; j < INPUT_URBS; ++j)
1447                                 usb_kill_urb(ep->in->urbs[j]);
1448                 /* free endpoints here; later call can result in Oops */
1449                 if (ep->out)
1450                         snd_usbmidi_out_endpoint_clear(ep->out);
1451                 if (ep->in) {
1452                         snd_usbmidi_in_endpoint_delete(ep->in);
1453                         ep->in = NULL;
1454                 }
1455         }
1456         del_timer_sync(&umidi->error_timer);
1457 }
1458
1459 static void snd_usbmidi_rawmidi_free(struct snd_rawmidi *rmidi)
1460 {
1461         struct snd_usb_midi* umidi = rmidi->private_data;
1462         snd_usbmidi_free(umidi);
1463 }
1464
1465 static struct snd_rawmidi_substream *snd_usbmidi_find_substream(struct snd_usb_midi* umidi,
1466                                                                 int stream, int number)
1467 {
1468         struct list_head* list;
1469
1470         list_for_each(list, &umidi->rmidi->streams[stream].substreams) {
1471                 struct snd_rawmidi_substream *substream = list_entry(list, struct snd_rawmidi_substream, list);
1472                 if (substream->number == number)
1473                         return substream;
1474         }
1475         return NULL;
1476 }
1477
1478 /*
1479  * This list specifies names for ports that do not fit into the standard
1480  * "(product) MIDI (n)" schema because they aren't external MIDI ports,
1481  * such as internal control or synthesizer ports.
1482  */
1483 static struct port_info {
1484         u32 id;
1485         short int port;
1486         short int voices;
1487         const char *name;
1488         unsigned int seq_flags;
1489 } snd_usbmidi_port_info[] = {
1490 #define PORT_INFO(vendor, product, num, name_, voices_, flags) \
1491         { .id = USB_ID(vendor, product), \
1492           .port = num, .voices = voices_, \
1493           .name = name_, .seq_flags = flags }
1494 #define EXTERNAL_PORT(vendor, product, num, name) \
1495         PORT_INFO(vendor, product, num, name, 0, \
1496                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1497                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1498                   SNDRV_SEQ_PORT_TYPE_PORT)
1499 #define CONTROL_PORT(vendor, product, num, name) \
1500         PORT_INFO(vendor, product, num, name, 0, \
1501                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1502                   SNDRV_SEQ_PORT_TYPE_HARDWARE)
1503 #define ROLAND_SYNTH_PORT(vendor, product, num, name, voices) \
1504         PORT_INFO(vendor, product, num, name, voices, \
1505                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1506                   SNDRV_SEQ_PORT_TYPE_MIDI_GM | \
1507                   SNDRV_SEQ_PORT_TYPE_MIDI_GM2 | \
1508                   SNDRV_SEQ_PORT_TYPE_MIDI_GS | \
1509                   SNDRV_SEQ_PORT_TYPE_MIDI_XG | \
1510                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1511                   SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
1512 #define SOUNDCANVAS_PORT(vendor, product, num, name, voices) \
1513         PORT_INFO(vendor, product, num, name, voices, \
1514                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1515                   SNDRV_SEQ_PORT_TYPE_MIDI_GM | \
1516                   SNDRV_SEQ_PORT_TYPE_MIDI_GM2 | \
1517                   SNDRV_SEQ_PORT_TYPE_MIDI_GS | \
1518                   SNDRV_SEQ_PORT_TYPE_MIDI_XG | \
1519                   SNDRV_SEQ_PORT_TYPE_MIDI_MT32 | \
1520                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1521                   SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
1522         /* Roland UA-100 */
1523         CONTROL_PORT(0x0582, 0x0000, 2, "%s Control"),
1524         /* Roland SC-8850 */
1525         SOUNDCANVAS_PORT(0x0582, 0x0003, 0, "%s Part A", 128),
1526         SOUNDCANVAS_PORT(0x0582, 0x0003, 1, "%s Part B", 128),
1527         SOUNDCANVAS_PORT(0x0582, 0x0003, 2, "%s Part C", 128),
1528         SOUNDCANVAS_PORT(0x0582, 0x0003, 3, "%s Part D", 128),
1529         EXTERNAL_PORT(0x0582, 0x0003, 4, "%s MIDI 1"),
1530         EXTERNAL_PORT(0x0582, 0x0003, 5, "%s MIDI 2"),
1531         /* Roland U-8 */
1532         EXTERNAL_PORT(0x0582, 0x0004, 0, "%s MIDI"),
1533         CONTROL_PORT(0x0582, 0x0004, 1, "%s Control"),
1534         /* Roland SC-8820 */
1535         SOUNDCANVAS_PORT(0x0582, 0x0007, 0, "%s Part A", 64),
1536         SOUNDCANVAS_PORT(0x0582, 0x0007, 1, "%s Part B", 64),
1537         EXTERNAL_PORT(0x0582, 0x0007, 2, "%s MIDI"),
1538         /* Roland SK-500 */
1539         SOUNDCANVAS_PORT(0x0582, 0x000b, 0, "%s Part A", 64),
1540         SOUNDCANVAS_PORT(0x0582, 0x000b, 1, "%s Part B", 64),
1541         EXTERNAL_PORT(0x0582, 0x000b, 2, "%s MIDI"),
1542         /* Roland SC-D70 */
1543         SOUNDCANVAS_PORT(0x0582, 0x000c, 0, "%s Part A", 64),
1544         SOUNDCANVAS_PORT(0x0582, 0x000c, 1, "%s Part B", 64),
1545         EXTERNAL_PORT(0x0582, 0x000c, 2, "%s MIDI"),
1546         /* Edirol UM-880 */
1547         CONTROL_PORT(0x0582, 0x0014, 8, "%s Control"),
1548         /* Edirol SD-90 */
1549         ROLAND_SYNTH_PORT(0x0582, 0x0016, 0, "%s Part A", 128),
1550         ROLAND_SYNTH_PORT(0x0582, 0x0016, 1, "%s Part B", 128),
1551         EXTERNAL_PORT(0x0582, 0x0016, 2, "%s MIDI 1"),
1552         EXTERNAL_PORT(0x0582, 0x0016, 3, "%s MIDI 2"),
1553         /* Edirol UM-550 */
1554         CONTROL_PORT(0x0582, 0x0023, 5, "%s Control"),
1555         /* Edirol SD-20 */
1556         ROLAND_SYNTH_PORT(0x0582, 0x0027, 0, "%s Part A", 64),
1557         ROLAND_SYNTH_PORT(0x0582, 0x0027, 1, "%s Part B", 64),
1558         EXTERNAL_PORT(0x0582, 0x0027, 2, "%s MIDI"),
1559         /* Edirol SD-80 */
1560         ROLAND_SYNTH_PORT(0x0582, 0x0029, 0, "%s Part A", 128),
1561         ROLAND_SYNTH_PORT(0x0582, 0x0029, 1, "%s Part B", 128),
1562         EXTERNAL_PORT(0x0582, 0x0029, 2, "%s MIDI 1"),
1563         EXTERNAL_PORT(0x0582, 0x0029, 3, "%s MIDI 2"),
1564         /* Edirol UA-700 */
1565         EXTERNAL_PORT(0x0582, 0x002b, 0, "%s MIDI"),
1566         CONTROL_PORT(0x0582, 0x002b, 1, "%s Control"),
1567         /* Roland VariOS */
1568         EXTERNAL_PORT(0x0582, 0x002f, 0, "%s MIDI"),
1569         EXTERNAL_PORT(0x0582, 0x002f, 1, "%s External MIDI"),
1570         EXTERNAL_PORT(0x0582, 0x002f, 2, "%s Sync"),
1571         /* Edirol PCR */
1572         EXTERNAL_PORT(0x0582, 0x0033, 0, "%s MIDI"),
1573         EXTERNAL_PORT(0x0582, 0x0033, 1, "%s 1"),
1574         EXTERNAL_PORT(0x0582, 0x0033, 2, "%s 2"),
1575         /* BOSS GS-10 */
1576         EXTERNAL_PORT(0x0582, 0x003b, 0, "%s MIDI"),
1577         CONTROL_PORT(0x0582, 0x003b, 1, "%s Control"),
1578         /* Edirol UA-1000 */
1579         EXTERNAL_PORT(0x0582, 0x0044, 0, "%s MIDI"),
1580         CONTROL_PORT(0x0582, 0x0044, 1, "%s Control"),
1581         /* Edirol UR-80 */
1582         EXTERNAL_PORT(0x0582, 0x0048, 0, "%s MIDI"),
1583         EXTERNAL_PORT(0x0582, 0x0048, 1, "%s 1"),
1584         EXTERNAL_PORT(0x0582, 0x0048, 2, "%s 2"),
1585         /* Edirol PCR-A */
1586         EXTERNAL_PORT(0x0582, 0x004d, 0, "%s MIDI"),
1587         EXTERNAL_PORT(0x0582, 0x004d, 1, "%s 1"),
1588         EXTERNAL_PORT(0x0582, 0x004d, 2, "%s 2"),
1589         /* Edirol UM-3EX */
1590         CONTROL_PORT(0x0582, 0x009a, 3, "%s Control"),
1591         /* M-Audio MidiSport 8x8 */
1592         CONTROL_PORT(0x0763, 0x1031, 8, "%s Control"),
1593         CONTROL_PORT(0x0763, 0x1033, 8, "%s Control"),
1594         /* MOTU Fastlane */
1595         EXTERNAL_PORT(0x07fd, 0x0001, 0, "%s MIDI A"),
1596         EXTERNAL_PORT(0x07fd, 0x0001, 1, "%s MIDI B"),
1597         /* Emagic Unitor8/AMT8/MT4 */
1598         EXTERNAL_PORT(0x086a, 0x0001, 8, "%s Broadcast"),
1599         EXTERNAL_PORT(0x086a, 0x0002, 8, "%s Broadcast"),
1600         EXTERNAL_PORT(0x086a, 0x0003, 4, "%s Broadcast"),
1601         /* Akai MPD16 */
1602         CONTROL_PORT(0x09e8, 0x0062, 0, "%s Control"),
1603         PORT_INFO(0x09e8, 0x0062, 1, "%s MIDI", 0,
1604                 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
1605                 SNDRV_SEQ_PORT_TYPE_HARDWARE),
1606         /* Access Music Virus TI */
1607         EXTERNAL_PORT(0x133e, 0x0815, 0, "%s MIDI"),
1608         PORT_INFO(0x133e, 0x0815, 1, "%s Synth", 0,
1609                 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
1610                 SNDRV_SEQ_PORT_TYPE_HARDWARE |
1611                 SNDRV_SEQ_PORT_TYPE_SYNTHESIZER),
1612 };
1613
1614 static struct port_info *find_port_info(struct snd_usb_midi* umidi, int number)
1615 {
1616         int i;
1617
1618         for (i = 0; i < ARRAY_SIZE(snd_usbmidi_port_info); ++i) {
1619                 if (snd_usbmidi_port_info[i].id == umidi->usb_id &&
1620                     snd_usbmidi_port_info[i].port == number)
1621                         return &snd_usbmidi_port_info[i];
1622         }
1623         return NULL;
1624 }
1625
1626 static void snd_usbmidi_get_port_info(struct snd_rawmidi *rmidi, int number,
1627                                       struct snd_seq_port_info *seq_port_info)
1628 {
1629         struct snd_usb_midi *umidi = rmidi->private_data;
1630         struct port_info *port_info;
1631
1632         /* TODO: read port flags from descriptors */
1633         port_info = find_port_info(umidi, number);
1634         if (port_info) {
1635                 seq_port_info->type = port_info->seq_flags;
1636                 seq_port_info->midi_voices = port_info->voices;
1637         }
1638 }
1639
1640 static void snd_usbmidi_init_substream(struct snd_usb_midi* umidi,
1641                                        int stream, int number,
1642                                        struct snd_rawmidi_substream ** rsubstream)
1643 {
1644         struct port_info *port_info;
1645         const char *name_format;
1646
1647         struct snd_rawmidi_substream *substream = snd_usbmidi_find_substream(umidi, stream, number);
1648         if (!substream) {
1649                 snd_printd(KERN_ERR "substream %d:%d not found\n", stream, number);
1650                 return;
1651         }
1652
1653         /* TODO: read port name from jack descriptor */
1654         port_info = find_port_info(umidi, number);
1655         name_format = port_info ? port_info->name : "%s MIDI %d";
1656         snprintf(substream->name, sizeof(substream->name),
1657                  name_format, umidi->card->shortname, number + 1);
1658
1659         *rsubstream = substream;
1660 }
1661
1662 /*
1663  * Creates the endpoints and their ports.
1664  */
1665 static int snd_usbmidi_create_endpoints(struct snd_usb_midi* umidi,
1666                                         struct snd_usb_midi_endpoint_info* endpoints)
1667 {
1668         int i, j, err;
1669         int out_ports = 0, in_ports = 0;
1670
1671         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1672                 if (endpoints[i].out_cables) {
1673                         err = snd_usbmidi_out_endpoint_create(umidi, &endpoints[i],
1674                                                               &umidi->endpoints[i]);
1675                         if (err < 0)
1676                                 return err;
1677                 }
1678                 if (endpoints[i].in_cables) {
1679                         err = snd_usbmidi_in_endpoint_create(umidi, &endpoints[i],
1680                                                              &umidi->endpoints[i]);
1681                         if (err < 0)
1682                                 return err;
1683                 }
1684
1685                 for (j = 0; j < 0x10; ++j) {
1686                         if (endpoints[i].out_cables & (1 << j)) {
1687                                 snd_usbmidi_init_substream(umidi, SNDRV_RAWMIDI_STREAM_OUTPUT, out_ports,
1688                                                            &umidi->endpoints[i].out->ports[j].substream);
1689                                 ++out_ports;
1690                         }
1691                         if (endpoints[i].in_cables & (1 << j)) {
1692                                 snd_usbmidi_init_substream(umidi, SNDRV_RAWMIDI_STREAM_INPUT, in_ports,
1693                                                            &umidi->endpoints[i].in->ports[j].substream);
1694                                 ++in_ports;
1695                         }
1696                 }
1697         }
1698         snd_printdd(KERN_INFO "created %d output and %d input ports\n",
1699                     out_ports, in_ports);
1700         return 0;
1701 }
1702
1703 /*
1704  * Returns MIDIStreaming device capabilities.
1705  */
1706 static int snd_usbmidi_get_ms_info(struct snd_usb_midi* umidi,
1707                                    struct snd_usb_midi_endpoint_info* endpoints)
1708 {
1709         struct usb_interface* intf;
1710         struct usb_host_interface *hostif;
1711         struct usb_interface_descriptor* intfd;
1712         struct usb_ms_header_descriptor* ms_header;
1713         struct usb_host_endpoint *hostep;
1714         struct usb_endpoint_descriptor* ep;
1715         struct usb_ms_endpoint_descriptor* ms_ep;
1716         int i, epidx;
1717
1718         intf = umidi->iface;
1719         if (!intf)
1720                 return -ENXIO;
1721         hostif = &intf->altsetting[0];
1722         intfd = get_iface_desc(hostif);
1723         ms_header = (struct usb_ms_header_descriptor*)hostif->extra;
1724         if (hostif->extralen >= 7 &&
1725             ms_header->bLength >= 7 &&
1726             ms_header->bDescriptorType == USB_DT_CS_INTERFACE &&
1727             ms_header->bDescriptorSubtype == UAC_HEADER)
1728                 snd_printdd(KERN_INFO "MIDIStreaming version %02x.%02x\n",
1729                             ms_header->bcdMSC[1], ms_header->bcdMSC[0]);
1730         else
1731                 snd_printk(KERN_WARNING "MIDIStreaming interface descriptor not found\n");
1732
1733         epidx = 0;
1734         for (i = 0; i < intfd->bNumEndpoints; ++i) {
1735                 hostep = &hostif->endpoint[i];
1736                 ep = get_ep_desc(hostep);
1737                 if (!usb_endpoint_xfer_bulk(ep) && !usb_endpoint_xfer_int(ep))
1738                         continue;
1739                 ms_ep = (struct usb_ms_endpoint_descriptor*)hostep->extra;
1740                 if (hostep->extralen < 4 ||
1741                     ms_ep->bLength < 4 ||
1742                     ms_ep->bDescriptorType != USB_DT_CS_ENDPOINT ||
1743                     ms_ep->bDescriptorSubtype != UAC_MS_GENERAL)
1744                         continue;
1745                 if (usb_endpoint_dir_out(ep)) {
1746                         if (endpoints[epidx].out_ep) {
1747                                 if (++epidx >= MIDI_MAX_ENDPOINTS) {
1748                                         snd_printk(KERN_WARNING "too many endpoints\n");
1749                                         break;
1750                                 }
1751                         }
1752                         endpoints[epidx].out_ep = usb_endpoint_num(ep);
1753                         if (usb_endpoint_xfer_int(ep))
1754                                 endpoints[epidx].out_interval = ep->bInterval;
1755                         else if (snd_usb_get_speed(umidi->dev) == USB_SPEED_LOW)
1756                                 /*
1757                                  * Low speed bulk transfers don't exist, so
1758                                  * force interrupt transfers for devices like
1759                                  * ESI MIDI Mate that try to use them anyway.
1760                                  */
1761                                 endpoints[epidx].out_interval = 1;
1762                         endpoints[epidx].out_cables = (1 << ms_ep->bNumEmbMIDIJack) - 1;
1763                         snd_printdd(KERN_INFO "EP %02X: %d jack(s)\n",
1764                                     ep->bEndpointAddress, ms_ep->bNumEmbMIDIJack);
1765                 } else {
1766                         if (endpoints[epidx].in_ep) {
1767                                 if (++epidx >= MIDI_MAX_ENDPOINTS) {
1768                                         snd_printk(KERN_WARNING "too many endpoints\n");
1769                                         break;
1770                                 }
1771                         }
1772                         endpoints[epidx].in_ep = usb_endpoint_num(ep);
1773                         if (usb_endpoint_xfer_int(ep))
1774                                 endpoints[epidx].in_interval = ep->bInterval;
1775                         else if (snd_usb_get_speed(umidi->dev) == USB_SPEED_LOW)
1776                                 endpoints[epidx].in_interval = 1;
1777                         endpoints[epidx].in_cables = (1 << ms_ep->bNumEmbMIDIJack) - 1;
1778                         snd_printdd(KERN_INFO "EP %02X: %d jack(s)\n",
1779                                     ep->bEndpointAddress, ms_ep->bNumEmbMIDIJack);
1780                 }
1781         }
1782         return 0;
1783 }
1784
1785 static int roland_load_info(struct snd_kcontrol *kcontrol,
1786                             struct snd_ctl_elem_info *info)
1787 {
1788         static const char *const names[] = { "High Load", "Light Load" };
1789
1790         return snd_ctl_enum_info(info, 1, 2, names);
1791 }
1792
1793 static int roland_load_get(struct snd_kcontrol *kcontrol,
1794                            struct snd_ctl_elem_value *value)
1795 {
1796         value->value.enumerated.item[0] = kcontrol->private_value;
1797         return 0;
1798 }
1799
1800 static int roland_load_put(struct snd_kcontrol *kcontrol,
1801                            struct snd_ctl_elem_value *value)
1802 {
1803         struct snd_usb_midi* umidi = kcontrol->private_data;
1804         int changed;
1805
1806         if (value->value.enumerated.item[0] > 1)
1807                 return -EINVAL;
1808         mutex_lock(&umidi->mutex);
1809         changed = value->value.enumerated.item[0] != kcontrol->private_value;
1810         if (changed)
1811                 kcontrol->private_value = value->value.enumerated.item[0];
1812         mutex_unlock(&umidi->mutex);
1813         return changed;
1814 }
1815
1816 static struct snd_kcontrol_new roland_load_ctl = {
1817         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1818         .name = "MIDI Input Mode",
1819         .info = roland_load_info,
1820         .get = roland_load_get,
1821         .put = roland_load_put,
1822         .private_value = 1,
1823 };
1824
1825 /*
1826  * On Roland devices, use the second alternate setting to be able to use
1827  * the interrupt input endpoint.
1828  */
1829 static void snd_usbmidi_switch_roland_altsetting(struct snd_usb_midi* umidi)
1830 {
1831         struct usb_interface* intf;
1832         struct usb_host_interface *hostif;
1833         struct usb_interface_descriptor* intfd;
1834
1835         intf = umidi->iface;
1836         if (!intf || intf->num_altsetting != 2)
1837                 return;
1838
1839         hostif = &intf->altsetting[1];
1840         intfd = get_iface_desc(hostif);
1841         if (intfd->bNumEndpoints != 2 ||
1842             (get_endpoint(hostif, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_BULK ||
1843             (get_endpoint(hostif, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_INT)
1844                 return;
1845
1846         snd_printdd(KERN_INFO "switching to altsetting %d with int ep\n",
1847                     intfd->bAlternateSetting);
1848         usb_set_interface(umidi->dev, intfd->bInterfaceNumber,
1849                           intfd->bAlternateSetting);
1850
1851         umidi->roland_load_ctl = snd_ctl_new1(&roland_load_ctl, umidi);
1852         if (snd_ctl_add(umidi->card, umidi->roland_load_ctl) < 0)
1853                 umidi->roland_load_ctl = NULL;
1854 }
1855
1856 /*
1857  * Try to find any usable endpoints in the interface.
1858  */
1859 static int snd_usbmidi_detect_endpoints(struct snd_usb_midi* umidi,
1860                                         struct snd_usb_midi_endpoint_info* endpoint,
1861                                         int max_endpoints)
1862 {
1863         struct usb_interface* intf;
1864         struct usb_host_interface *hostif;
1865         struct usb_interface_descriptor* intfd;
1866         struct usb_endpoint_descriptor* epd;
1867         int i, out_eps = 0, in_eps = 0;
1868
1869         if (USB_ID_VENDOR(umidi->usb_id) == 0x0582)
1870                 snd_usbmidi_switch_roland_altsetting(umidi);
1871
1872         if (endpoint[0].out_ep || endpoint[0].in_ep)
1873                 return 0;
1874
1875         intf = umidi->iface;
1876         if (!intf || intf->num_altsetting < 1)
1877                 return -ENOENT;
1878         hostif = intf->cur_altsetting;
1879         intfd = get_iface_desc(hostif);
1880
1881         for (i = 0; i < intfd->bNumEndpoints; ++i) {
1882                 epd = get_endpoint(hostif, i);
1883                 if (!usb_endpoint_xfer_bulk(epd) &&
1884                     !usb_endpoint_xfer_int(epd))
1885                         continue;
1886                 if (out_eps < max_endpoints &&
1887                     usb_endpoint_dir_out(epd)) {
1888                         endpoint[out_eps].out_ep = usb_endpoint_num(epd);
1889                         if (usb_endpoint_xfer_int(epd))
1890                                 endpoint[out_eps].out_interval = epd->bInterval;
1891                         ++out_eps;
1892                 }
1893                 if (in_eps < max_endpoints &&
1894                     usb_endpoint_dir_in(epd)) {
1895                         endpoint[in_eps].in_ep = usb_endpoint_num(epd);
1896                         if (usb_endpoint_xfer_int(epd))
1897                                 endpoint[in_eps].in_interval = epd->bInterval;
1898                         ++in_eps;
1899                 }
1900         }
1901         return (out_eps || in_eps) ? 0 : -ENOENT;
1902 }
1903
1904 /*
1905  * Detects the endpoints for one-port-per-endpoint protocols.
1906  */
1907 static int snd_usbmidi_detect_per_port_endpoints(struct snd_usb_midi* umidi,
1908                                                  struct snd_usb_midi_endpoint_info* endpoints)
1909 {
1910         int err, i;
1911
1912         err = snd_usbmidi_detect_endpoints(umidi, endpoints, MIDI_MAX_ENDPOINTS);
1913         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1914                 if (endpoints[i].out_ep)
1915                         endpoints[i].out_cables = 0x0001;
1916                 if (endpoints[i].in_ep)
1917                         endpoints[i].in_cables = 0x0001;
1918         }
1919         return err;
1920 }
1921
1922 /*
1923  * Detects the endpoints and ports of Yamaha devices.
1924  */
1925 static int snd_usbmidi_detect_yamaha(struct snd_usb_midi* umidi,
1926                                      struct snd_usb_midi_endpoint_info* endpoint)
1927 {
1928         struct usb_interface* intf;
1929         struct usb_host_interface *hostif;
1930         struct usb_interface_descriptor* intfd;
1931         uint8_t* cs_desc;
1932
1933         intf = umidi->iface;
1934         if (!intf)
1935                 return -ENOENT;
1936         hostif = intf->altsetting;
1937         intfd = get_iface_desc(hostif);
1938         if (intfd->bNumEndpoints < 1)
1939                 return -ENOENT;
1940
1941         /*
1942          * For each port there is one MIDI_IN/OUT_JACK descriptor, not
1943          * necessarily with any useful contents.  So simply count 'em.
1944          */
1945         for (cs_desc = hostif->extra;
1946              cs_desc < hostif->extra + hostif->extralen && cs_desc[0] >= 2;
1947              cs_desc += cs_desc[0]) {
1948                 if (cs_desc[1] == USB_DT_CS_INTERFACE) {
1949                         if (cs_desc[2] == UAC_MIDI_IN_JACK)
1950                                 endpoint->in_cables = (endpoint->in_cables << 1) | 1;
1951                         else if (cs_desc[2] == UAC_MIDI_OUT_JACK)
1952                                 endpoint->out_cables = (endpoint->out_cables << 1) | 1;
1953                 }
1954         }
1955         if (!endpoint->in_cables && !endpoint->out_cables)
1956                 return -ENOENT;
1957
1958         return snd_usbmidi_detect_endpoints(umidi, endpoint, 1);
1959 }
1960
1961 /*
1962  * Creates the endpoints and their ports for Midiman devices.
1963  */
1964 static int snd_usbmidi_create_endpoints_midiman(struct snd_usb_midi* umidi,
1965                                                 struct snd_usb_midi_endpoint_info* endpoint)
1966 {
1967         struct snd_usb_midi_endpoint_info ep_info;
1968         struct usb_interface* intf;
1969         struct usb_host_interface *hostif;
1970         struct usb_interface_descriptor* intfd;
1971         struct usb_endpoint_descriptor* epd;
1972         int cable, err;
1973
1974         intf = umidi->iface;
1975         if (!intf)
1976                 return -ENOENT;
1977         hostif = intf->altsetting;
1978         intfd = get_iface_desc(hostif);
1979         /*
1980          * The various MidiSport devices have more or less random endpoint
1981          * numbers, so we have to identify the endpoints by their index in
1982          * the descriptor array, like the driver for that other OS does.
1983          *
1984          * There is one interrupt input endpoint for all input ports, one
1985          * bulk output endpoint for even-numbered ports, and one for odd-
1986          * numbered ports.  Both bulk output endpoints have corresponding
1987          * input bulk endpoints (at indices 1 and 3) which aren't used.
1988          */
1989         if (intfd->bNumEndpoints < (endpoint->out_cables > 0x0001 ? 5 : 3)) {
1990                 snd_printdd(KERN_ERR "not enough endpoints\n");
1991                 return -ENOENT;
1992         }
1993
1994         epd = get_endpoint(hostif, 0);
1995         if (!usb_endpoint_dir_in(epd) || !usb_endpoint_xfer_int(epd)) {
1996                 snd_printdd(KERN_ERR "endpoint[0] isn't interrupt\n");
1997                 return -ENXIO;
1998         }
1999         epd = get_endpoint(hostif, 2);
2000         if (!usb_endpoint_dir_out(epd) || !usb_endpoint_xfer_bulk(epd)) {
2001                 snd_printdd(KERN_ERR "endpoint[2] isn't bulk output\n");
2002                 return -ENXIO;
2003         }
2004         if (endpoint->out_cables > 0x0001) {
2005                 epd = get_endpoint(hostif, 4);
2006                 if (!usb_endpoint_dir_out(epd) ||
2007                     !usb_endpoint_xfer_bulk(epd)) {
2008                         snd_printdd(KERN_ERR "endpoint[4] isn't bulk output\n");
2009                         return -ENXIO;
2010                 }
2011         }
2012
2013         ep_info.out_ep = get_endpoint(hostif, 2)->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
2014         ep_info.out_interval = 0;
2015         ep_info.out_cables = endpoint->out_cables & 0x5555;
2016         err = snd_usbmidi_out_endpoint_create(umidi, &ep_info, &umidi->endpoints[0]);
2017         if (err < 0)
2018                 return err;
2019
2020         ep_info.in_ep = get_endpoint(hostif, 0)->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
2021         ep_info.in_interval = get_endpoint(hostif, 0)->bInterval;
2022         ep_info.in_cables = endpoint->in_cables;
2023         err = snd_usbmidi_in_endpoint_create(umidi, &ep_info, &umidi->endpoints[0]);
2024         if (err < 0)
2025                 return err;
2026
2027         if (endpoint->out_cables > 0x0001) {
2028                 ep_info.out_ep = get_endpoint(hostif, 4)->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
2029                 ep_info.out_cables = endpoint->out_cables & 0xaaaa;
2030                 err = snd_usbmidi_out_endpoint_create(umidi, &ep_info, &umidi->endpoints[1]);
2031                 if (err < 0)
2032                         return err;
2033         }
2034
2035         for (cable = 0; cable < 0x10; ++cable) {
2036                 if (endpoint->out_cables & (1 << cable))
2037                         snd_usbmidi_init_substream(umidi, SNDRV_RAWMIDI_STREAM_OUTPUT, cable,
2038                                                    &umidi->endpoints[cable & 1].out->ports[cable].substream);
2039                 if (endpoint->in_cables & (1 << cable))
2040                         snd_usbmidi_init_substream(umidi, SNDRV_RAWMIDI_STREAM_INPUT, cable,
2041                                                    &umidi->endpoints[0].in->ports[cable].substream);
2042         }
2043         return 0;
2044 }
2045
2046 static struct snd_rawmidi_global_ops snd_usbmidi_ops = {
2047         .get_port_info = snd_usbmidi_get_port_info,
2048 };
2049
2050 static int snd_usbmidi_create_rawmidi(struct snd_usb_midi* umidi,
2051                                       int out_ports, int in_ports)
2052 {
2053         struct snd_rawmidi *rmidi;
2054         int err;
2055
2056         err = snd_rawmidi_new(umidi->card, "USB MIDI",
2057                               umidi->next_midi_device++,
2058                               out_ports, in_ports, &rmidi);
2059         if (err < 0)
2060                 return err;
2061         strcpy(rmidi->name, umidi->card->shortname);
2062         rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
2063                             SNDRV_RAWMIDI_INFO_INPUT |
2064                             SNDRV_RAWMIDI_INFO_DUPLEX;
2065         rmidi->ops = &snd_usbmidi_ops;
2066         rmidi->private_data = umidi;
2067         rmidi->private_free = snd_usbmidi_rawmidi_free;
2068         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_usbmidi_output_ops);
2069         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_usbmidi_input_ops);
2070
2071         umidi->rmidi = rmidi;
2072         return 0;
2073 }
2074
2075 /*
2076  * Temporarily stop input.
2077  */
2078 void snd_usbmidi_input_stop(struct list_head* p)
2079 {
2080         struct snd_usb_midi* umidi;
2081         unsigned int i, j;
2082
2083         umidi = list_entry(p, struct snd_usb_midi, list);
2084         if (!umidi->input_running)
2085                 return;
2086         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
2087                 struct snd_usb_midi_endpoint* ep = &umidi->endpoints[i];
2088                 if (ep->in)
2089                         for (j = 0; j < INPUT_URBS; ++j)
2090                                 usb_kill_urb(ep->in->urbs[j]);
2091         }
2092         umidi->input_running = 0;
2093 }
2094
2095 static void snd_usbmidi_input_start_ep(struct snd_usb_midi_in_endpoint* ep)
2096 {
2097         unsigned int i;
2098
2099         if (!ep)
2100                 return;
2101         for (i = 0; i < INPUT_URBS; ++i) {
2102                 struct urb* urb = ep->urbs[i];
2103                 urb->dev = ep->umidi->dev;
2104                 snd_usbmidi_submit_urb(urb, GFP_KERNEL);
2105         }
2106 }
2107
2108 /*
2109  * Resume input after a call to snd_usbmidi_input_stop().
2110  */
2111 void snd_usbmidi_input_start(struct list_head* p)
2112 {
2113         struct snd_usb_midi* umidi;
2114         int i;
2115
2116         umidi = list_entry(p, struct snd_usb_midi, list);
2117         if (umidi->input_running || !umidi->opened[1])
2118                 return;
2119         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
2120                 snd_usbmidi_input_start_ep(umidi->endpoints[i].in);
2121         umidi->input_running = 1;
2122 }
2123
2124 /*
2125  * Creates and registers everything needed for a MIDI streaming interface.
2126  */
2127 int snd_usbmidi_create(struct snd_card *card,
2128                        struct usb_interface* iface,
2129                        struct list_head *midi_list,
2130                        const struct snd_usb_audio_quirk* quirk)
2131 {
2132         struct snd_usb_midi* umidi;
2133         struct snd_usb_midi_endpoint_info endpoints[MIDI_MAX_ENDPOINTS];
2134         int out_ports, in_ports;
2135         int i, err;
2136
2137         umidi = kzalloc(sizeof(*umidi), GFP_KERNEL);
2138         if (!umidi)
2139                 return -ENOMEM;
2140         umidi->dev = interface_to_usbdev(iface);
2141         umidi->card = card;
2142         umidi->iface = iface;
2143         umidi->quirk = quirk;
2144         umidi->usb_protocol_ops = &snd_usbmidi_standard_ops;
2145         init_timer(&umidi->error_timer);
2146         spin_lock_init(&umidi->disc_lock);
2147         init_rwsem(&umidi->disc_rwsem);
2148         mutex_init(&umidi->mutex);
2149         umidi->usb_id = USB_ID(le16_to_cpu(umidi->dev->descriptor.idVendor),
2150                                le16_to_cpu(umidi->dev->descriptor.idProduct));
2151         umidi->error_timer.function = snd_usbmidi_error_timer;
2152         umidi->error_timer.data = (unsigned long)umidi;
2153
2154         /* detect the endpoint(s) to use */
2155         memset(endpoints, 0, sizeof(endpoints));
2156         switch (quirk ? quirk->type : QUIRK_MIDI_STANDARD_INTERFACE) {
2157         case QUIRK_MIDI_STANDARD_INTERFACE:
2158                 err = snd_usbmidi_get_ms_info(umidi, endpoints);
2159                 if (umidi->usb_id == USB_ID(0x0763, 0x0150)) /* M-Audio Uno */
2160                         umidi->usb_protocol_ops =
2161                                 &snd_usbmidi_maudio_broken_running_status_ops;
2162                 break;
2163         case QUIRK_MIDI_US122L:
2164                 umidi->usb_protocol_ops = &snd_usbmidi_122l_ops;
2165                 /* fall through */
2166         case QUIRK_MIDI_FIXED_ENDPOINT:
2167                 memcpy(&endpoints[0], quirk->data,
2168                        sizeof(struct snd_usb_midi_endpoint_info));
2169                 err = snd_usbmidi_detect_endpoints(umidi, &endpoints[0], 1);
2170                 break;
2171         case QUIRK_MIDI_YAMAHA:
2172                 err = snd_usbmidi_detect_yamaha(umidi, &endpoints[0]);
2173                 break;
2174         case QUIRK_MIDI_MIDIMAN:
2175                 umidi->usb_protocol_ops = &snd_usbmidi_midiman_ops;
2176                 memcpy(&endpoints[0], quirk->data,
2177                        sizeof(struct snd_usb_midi_endpoint_info));
2178                 err = 0;
2179                 break;
2180         case QUIRK_MIDI_NOVATION:
2181                 umidi->usb_protocol_ops = &snd_usbmidi_novation_ops;
2182                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2183                 break;
2184         case QUIRK_MIDI_RAW_BYTES:
2185                 umidi->usb_protocol_ops = &snd_usbmidi_raw_ops;
2186                 /*
2187                  * Interface 1 contains isochronous endpoints, but with the same
2188                  * numbers as in interface 0.  Since it is interface 1 that the
2189                  * USB core has most recently seen, these descriptors are now
2190                  * associated with the endpoint numbers.  This will foul up our
2191                  * attempts to submit bulk/interrupt URBs to the endpoints in
2192                  * interface 0, so we have to make sure that the USB core looks
2193                  * again at interface 0 by calling usb_set_interface() on it.
2194                  */
2195                 if (umidi->usb_id == USB_ID(0x07fd, 0x0001)) /* MOTU Fastlane */
2196                         usb_set_interface(umidi->dev, 0, 0);
2197                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2198                 break;
2199         case QUIRK_MIDI_EMAGIC:
2200                 umidi->usb_protocol_ops = &snd_usbmidi_emagic_ops;
2201                 memcpy(&endpoints[0], quirk->data,
2202                        sizeof(struct snd_usb_midi_endpoint_info));
2203                 err = snd_usbmidi_detect_endpoints(umidi, &endpoints[0], 1);
2204                 break;
2205         case QUIRK_MIDI_CME:
2206                 umidi->usb_protocol_ops = &snd_usbmidi_cme_ops;
2207                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2208                 break;
2209         case QUIRK_MIDI_AKAI:
2210                 umidi->usb_protocol_ops = &snd_usbmidi_akai_ops;
2211                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2212                 /* endpoint 1 is input-only */
2213                 endpoints[1].out_cables = 0;
2214                 break;
2215         case QUIRK_MIDI_FTDI:
2216                 umidi->usb_protocol_ops = &snd_usbmidi_ftdi_ops;
2217
2218                 /* set baud rate to 31250 (48 MHz / 16 / 96) */
2219                 err = usb_control_msg(umidi->dev, usb_sndctrlpipe(umidi->dev, 0),
2220                                       3, 0x40, 0x60, 0, NULL, 0, 1000);
2221                 if (err < 0)
2222                         break;
2223
2224                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2225                 break;
2226         default:
2227                 snd_printd(KERN_ERR "invalid quirk type %d\n", quirk->type);
2228                 err = -ENXIO;
2229                 break;
2230         }
2231         if (err < 0) {
2232                 kfree(umidi);
2233                 return err;
2234         }
2235
2236         /* create rawmidi device */
2237         out_ports = 0;
2238         in_ports = 0;
2239         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
2240                 out_ports += hweight16(endpoints[i].out_cables);
2241                 in_ports += hweight16(endpoints[i].in_cables);
2242         }
2243         err = snd_usbmidi_create_rawmidi(umidi, out_ports, in_ports);
2244         if (err < 0) {
2245                 kfree(umidi);
2246                 return err;
2247         }
2248
2249         /* create endpoint/port structures */
2250         if (quirk && quirk->type == QUIRK_MIDI_MIDIMAN)
2251                 err = snd_usbmidi_create_endpoints_midiman(umidi, &endpoints[0]);
2252         else
2253                 err = snd_usbmidi_create_endpoints(umidi, endpoints);
2254         if (err < 0) {
2255                 snd_usbmidi_free(umidi);
2256                 return err;
2257         }
2258
2259         list_add_tail(&umidi->list, midi_list);
2260         return 0;
2261 }
2262
2263 EXPORT_SYMBOL(snd_usbmidi_create);
2264 EXPORT_SYMBOL(snd_usbmidi_input_stop);
2265 EXPORT_SYMBOL(snd_usbmidi_input_start);
2266 EXPORT_SYMBOL(snd_usbmidi_disconnect);