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