sound/usb/midi.c

   1 /*
   2  * usbmidi.c - ALSA USB MIDI driver
   3  *
   4  * Copyright (c) 2002-2009 Clemens Ladisch
   5  * All rights reserved.
   6  *
   7  * Based on the OSS usb-midi driver by NAGANO Daisuke,
   8  *          NetBSD's umidi driver by Takuya SHIOZAKI,
   9  *          the "USB Device Class Definition for MIDI Devices" by Roland
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. The name of the author may not be used to endorse or promote products
  18  *    derived from this software without specific prior written permission.
  19  *
  20  * Alternatively, this software may be distributed and/or modified under the
  21  * terms of the GNU General Public License as published by the Free Software
  22  * Foundation; either version 2 of the License, or (at your option) any later
  23  * version.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  29  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  */
  37
  38 #include <linux/kernel.h>
  39 #include <linux/types.h>
  40 #include <linux/bitops.h>
  41 #include <linux/interrupt.h>
  42 #include <linux/spinlock.h>
  43 #include <linux/string.h>
  44 #include <linux/init.h>
  45 #include <linux/slab.h>
  46 #include <linux/timer.h>
  47 #include <linux/usb.h>
  48 #include <linux/wait.h>
  49 #include <linux/usb/audio.h>
  50 #include <linux/module.h>
  51
  52 #include <sound/core.h>
  53 #include <sound/control.h>
  54 #include <sound/rawmidi.h>
  55 #include <sound/asequencer.h>
  56 #include "usbaudio.h"
  57 #include "midi.h"
  58 #include "power.h"
  59 #include "helper.h"
  60
  61 /*
  62  * define this to log all USB packets
  63  */
  64 /* #define DUMP_PACKETS */
  65
  66 /*
  67  * how long to wait after some USB errors, so that hub_wq can disconnect() us
  68  * without too many spurious errors
  69  */
  70 #define ERROR_DELAY_JIFFIES (HZ / 10)
  71
  72 #define OUTPUT_URBS 7
  73 #define INPUT_URBS 7
  74
  75
  76 MODULE_AUTHOR("Clemens Ladisch <[email protected]>");
  77 MODULE_DESCRIPTION("USB Audio/MIDI helper module");
  78 MODULE_LICENSE("Dual BSD/GPL");
  79
  80
  81 struct usb_ms_header_descriptor {
  82         __u8  bLength;
  83         __u8  bDescriptorType;
  84         __u8  bDescriptorSubtype;
  85         __u8  bcdMSC[2];
  86         __le16 wTotalLength;
  87 } __attribute__ ((packed));
  88
  89 struct usb_ms_endpoint_descriptor {
  90         __u8  bLength;
  91         __u8  bDescriptorType;
  92         __u8  bDescriptorSubtype;
  93         __u8  bNumEmbMIDIJack;
  94         __u8  baAssocJackID[0];
  95 } __attribute__ ((packed));
  96
  97 struct snd_usb_midi_in_endpoint;
  98 struct snd_usb_midi_out_endpoint;
  99 struct snd_usb_midi_endpoint;
 100
 101 struct usb_protocol_ops {
 102         void (*input)(struct snd_usb_midi_in_endpoint*, uint8_t*, int);
 103         void (*output)(struct snd_usb_midi_out_endpoint *ep, struct urb *urb);
 104         void (*output_packet)(struct urb*, uint8_t, uint8_t, uint8_t, uint8_t);
 105         void (*init_out_endpoint)(struct snd_usb_midi_out_endpoint *);
 106         void (*finish_out_endpoint)(struct snd_usb_midi_out_endpoint *);
 107 };
 108
 109 struct snd_usb_midi {
 110         struct usb_device *dev;
 111         struct snd_card *card;
 112         struct usb_interface *iface;
 113         const struct snd_usb_audio_quirk *quirk;
 114         struct snd_rawmidi *rmidi;
 115         const struct usb_protocol_ops *usb_protocol_ops;
 116         struct list_head list;
 117         struct timer_list error_timer;
 118         spinlock_t disc_lock;
 119         struct rw_semaphore disc_rwsem;
 120         struct mutex mutex;
 121         u32 usb_id;
 122         int next_midi_device;
 123
 124         struct snd_usb_midi_endpoint {
 125                 struct snd_usb_midi_out_endpoint *out;
 126                 struct snd_usb_midi_in_endpoint *in;
 127         } endpoints[MIDI_MAX_ENDPOINTS];
 128         unsigned long input_triggered;
 129         unsigned int opened[2];
 130         unsigned char disconnected;
 131         unsigned char input_running;
 132
 133         struct snd_kcontrol *roland_load_ctl;
 134 };
 135
 136 struct snd_usb_midi_out_endpoint {
 137         struct snd_usb_midi *umidi;
 138         struct out_urb_context {
 139                 struct urb *urb;
 140                 struct snd_usb_midi_out_endpoint *ep;
 141         } urbs[OUTPUT_URBS];
 142         unsigned int active_urbs;
 143         unsigned int drain_urbs;
 144         int max_transfer;               /* size of urb buffer */
 145         struct tasklet_struct tasklet;
 146         unsigned int next_urb;
 147         spinlock_t buffer_lock;
 148
 149         struct usbmidi_out_port {
 150                 struct snd_usb_midi_out_endpoint *ep;
 151                 struct snd_rawmidi_substream *substream;
 152                 int active;
 153                 uint8_t cable;          /* cable number << 4 */
 154                 uint8_t state;
 155 #define STATE_UNKNOWN   0
 156 #define STATE_1PARAM    1
 157 #define STATE_2PARAM_1  2
 158 #define STATE_2PARAM_2  3
 159 #define STATE_SYSEX_0   4
 160 #define STATE_SYSEX_1   5
 161 #define STATE_SYSEX_2   6
 162                 uint8_t data[2];
 163         } ports[0x10];
 164         int current_port;
 165
 166         wait_queue_head_t drain_wait;
 167 };
 168
 169 struct snd_usb_midi_in_endpoint {
 170         struct snd_usb_midi *umidi;
 171         struct urb *urbs[INPUT_URBS];
 172         struct usbmidi_in_port {
 173                 struct snd_rawmidi_substream *substream;
 174                 u8 running_status_length;
 175         } ports[0x10];
 176         u8 seen_f5;
 177         bool in_sysex;
 178         u8 last_cin;
 179         u8 error_resubmit;
 180         int current_port;
 181 };
 182
 183 static void snd_usbmidi_do_output(struct snd_usb_midi_out_endpoint *ep);
 184
 185 static const uint8_t snd_usbmidi_cin_length[] = {
 186         0, 0, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 2, 2, 3, 1
 187 };
 188
 189 /*
 190  * Submits the URB, with error handling.
 191  */
 192 static int snd_usbmidi_submit_urb(struct urb *urb, gfp_t flags)
 193 {
 194         int err = usb_submit_urb(urb, flags);
 195         if (err < 0 && err != -ENODEV)
 196                 dev_err(&urb->dev->dev, "usb_submit_urb: %d\n", err);
 197         return err;
 198 }
 199
 200 /*
 201  * Error handling for URB completion functions.
 202  */
 203 static int snd_usbmidi_urb_error(const struct urb *urb)
 204 {
 205         switch (urb->status) {
 206         /* manually unlinked, or device gone */
 207         case -ENOENT:
 208         case -ECONNRESET:
 209         case -ESHUTDOWN:
 210         case -ENODEV:
 211                 return -ENODEV;
 212         /* errors that might occur during unplugging */
 213         case -EPROTO:
 214         case -ETIME:
 215         case -EILSEQ:
 216                 return -EIO;
 217         default:
 218                 dev_err(&urb->dev->dev, "urb status %d\n", urb->status);
 219                 return 0; /* continue */
 220         }
 221 }
 222
 223 /*
 224  * Receives a chunk of MIDI data.
 225  */
 226 static void snd_usbmidi_input_data(struct snd_usb_midi_in_endpoint *ep,
 227                                    int portidx, uint8_t *data, int length)
 228 {
 229         struct usbmidi_in_port *port = &ep->ports[portidx];
 230
 231         if (!port->substream) {
 232                 dev_dbg(&ep->umidi->dev->dev, "unexpected port %d!\n", portidx);
 233                 return;
 234         }
 235         if (!test_bit(port->substream->number, &ep->umidi->input_triggered))
 236                 return;
 237         snd_rawmidi_receive(port->substream, data, length);
 238 }
 239
 240 #ifdef DUMP_PACKETS
 241 static void dump_urb(const char *type, const u8 *data, int length)
 242 {
 243         snd_printk(KERN_DEBUG "%s packet: [", type);
 244         for (; length > 0; ++data, --length)
 245                 printk(" %02x", *data);
 246         printk(" ]\n");
 247 }
 248 #else
 249 #define dump_urb(type, data, length) /* nothing */
 250 #endif
 251
 252 /*
 253  * Processes the data read from the device.
 254  */
 255 static void snd_usbmidi_in_urb_complete(struct urb *urb)
 256 {
 257         struct snd_usb_midi_in_endpoint *ep = urb->context;
 258
 259         if (urb->status == 0) {
 260                 dump_urb("received", urb->transfer_buffer, urb->actual_length);
 261                 ep->umidi->usb_protocol_ops->input(ep, urb->transfer_buffer,
 262                                                    urb->actual_length);
 263         } else {
 264                 int err = snd_usbmidi_urb_error(urb);
 265                 if (err < 0) {
 266                         if (err != -ENODEV) {
 267                                 ep->error_resubmit = 1;
 268                                 mod_timer(&ep->umidi->error_timer,
 269                                           jiffies + ERROR_DELAY_JIFFIES);
 270                         }
 271                         return;
 272                 }
 273         }
 274
 275         urb->dev = ep->umidi->dev;
 276         snd_usbmidi_submit_urb(urb, GFP_ATOMIC);
 277 }
 278
 279 static void snd_usbmidi_out_urb_complete(struct urb *urb)
 280 {
 281         struct out_urb_context *context = urb->context;
 282         struct snd_usb_midi_out_endpoint *ep = context->ep;
 283         unsigned int urb_index;
 284
 285         spin_lock(&ep->buffer_lock);
 286         urb_index = context - ep->urbs;
 287         ep->active_urbs &= ~(1 << urb_index);
 288         if (unlikely(ep->drain_urbs)) {
 289                 ep->drain_urbs &= ~(1 << urb_index);
 290                 wake_up(&ep->drain_wait);
 291         }
 292         spin_unlock(&ep->buffer_lock);
 293         if (urb->status < 0) {
 294                 int err = snd_usbmidi_urb_error(urb);
 295                 if (err < 0) {
 296                         if (err != -ENODEV)
 297                                 mod_timer(&ep->umidi->error_timer,
 298                                           jiffies + ERROR_DELAY_JIFFIES);
 299                         return;
 300                 }
 301         }
 302         snd_usbmidi_do_output(ep);
 303 }
 304
 305 /*
 306  * This is called when some data should be transferred to the device
 307  * (from one or more substreams).
 308  */
 309 static void snd_usbmidi_do_output(struct snd_usb_midi_out_endpoint *ep)
 310 {
 311         unsigned int urb_index;
 312         struct urb *urb;
 313         unsigned long flags;
 314
 315         spin_lock_irqsave(&ep->buffer_lock, flags);
 316         if (ep->umidi->disconnected) {
 317                 spin_unlock_irqrestore(&ep->buffer_lock, flags);
 318                 return;
 319         }
 320
 321         urb_index = ep->next_urb;
 322         for (;;) {
 323                 if (!(ep->active_urbs & (1 << urb_index))) {
 324                         urb = ep->urbs[urb_index].urb;
 325                         urb->transfer_buffer_length = 0;
 326                         ep->umidi->usb_protocol_ops->output(ep, urb);
 327                         if (urb->transfer_buffer_length == 0)
 328                                 break;
 329
 330                         dump_urb("sending", urb->transfer_buffer,
 331                                  urb->transfer_buffer_length);
 332                         urb->dev = ep->umidi->dev;
 333                         if (snd_usbmidi_submit_urb(urb, GFP_ATOMIC) < 0)
 334                                 break;
 335                         ep->active_urbs |= 1 << urb_index;
 336                 }
 337                 if (++urb_index >= OUTPUT_URBS)
 338                         urb_index = 0;
 339                 if (urb_index == ep->next_urb)
 340                         break;
 341         }
 342         ep->next_urb = urb_index;
 343         spin_unlock_irqrestore(&ep->buffer_lock, flags);
 344 }
 345
 346 static void snd_usbmidi_out_tasklet(unsigned long data)
 347 {
 348         struct snd_usb_midi_out_endpoint *ep =
 349                 (struct snd_usb_midi_out_endpoint *) data;
 350
 351         snd_usbmidi_do_output(ep);
 352 }
 353
 354 /* called after transfers had been interrupted due to some USB error */
 355 static void snd_usbmidi_error_timer(unsigned long data)
 356 {
 357         struct snd_usb_midi *umidi = (struct snd_usb_midi *)data;
 358         unsigned int i, j;
 359
 360         spin_lock(&umidi->disc_lock);
 361         if (umidi->disconnected) {
 362                 spin_unlock(&umidi->disc_lock);
 363                 return;
 364         }
 365         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
 366                 struct snd_usb_midi_in_endpoint *in = umidi->endpoints[i].in;
 367                 if (in && in->error_resubmit) {
 368                         in->error_resubmit = 0;
 369                         for (j = 0; j < INPUT_URBS; ++j) {
 370                                 if (atomic_read(&in->urbs[j]->use_count))
 371                                         continue;
 372                                 in->urbs[j]->dev = umidi->dev;
 373                                 snd_usbmidi_submit_urb(in->urbs[j], GFP_ATOMIC);
 374                         }
 375                 }
 376                 if (umidi->endpoints[i].out)
 377                         snd_usbmidi_do_output(umidi->endpoints[i].out);
 378         }
 379         spin_unlock(&umidi->disc_lock);
 380 }
 381
 382 /* helper function to send static data that may not DMA-able */
 383 static int send_bulk_static_data(struct snd_usb_midi_out_endpoint *ep,
 384                                  const void *data, int len)
 385 {
 386         int err = 0;
 387         void *buf = kmemdup(data, len, GFP_KERNEL);
 388         if (!buf)
 389                 return -ENOMEM;
 390         dump_urb("sending", buf, len);
 391         if (ep->urbs[0].urb)
 392                 err = usb_bulk_msg(ep->umidi->dev, ep->urbs[0].urb->pipe,
 393                                    buf, len, NULL, 250);
 394         kfree(buf);
 395         return err;
 396 }
 397
 398 /*
 399  * Standard USB MIDI protocol: see the spec.
 400  * Midiman protocol: like the standard protocol, but the control byte is the
 401  * fourth byte in each packet, and uses length instead of CIN.
 402  */
 403
 404 static void snd_usbmidi_standard_input(struct snd_usb_midi_in_endpoint *ep,
 405                                        uint8_t *buffer, int buffer_length)
 406 {
 407         int i;
 408
 409         for (i = 0; i + 3 < buffer_length; i += 4)
 410                 if (buffer[i] != 0) {
 411                         int cable = buffer[i] >> 4;
 412                         int length = snd_usbmidi_cin_length[buffer[i] & 0x0f];
 413                         snd_usbmidi_input_data(ep, cable, &buffer[i + 1],
 414                                                length);
 415                 }
 416 }
 417
 418 static void snd_usbmidi_midiman_input(struct snd_usb_midi_in_endpoint *ep,
 419                                       uint8_t *buffer, int buffer_length)
 420 {
 421         int i;
 422
 423         for (i = 0; i + 3 < buffer_length; i += 4)
 424                 if (buffer[i + 3] != 0) {
 425                         int port = buffer[i + 3] >> 4;
 426                         int length = buffer[i + 3] & 3;
 427                         snd_usbmidi_input_data(ep, port, &buffer[i], length);
 428                 }
 429 }
 430
 431 /*
 432  * Buggy M-Audio device: running status on input results in a packet that has
 433  * the data bytes but not the status byte and that is marked with CIN 4.
 434  */
 435 static void snd_usbmidi_maudio_broken_running_status_input(
 436                                         struct snd_usb_midi_in_endpoint *ep,
 437                                         uint8_t *buffer, int buffer_length)
 438 {
 439         int i;
 440
 441         for (i = 0; i + 3 < buffer_length; i += 4)
 442                 if (buffer[i] != 0) {
 443                         int cable = buffer[i] >> 4;
 444                         u8 cin = buffer[i] & 0x0f;
 445                         struct usbmidi_in_port *port = &ep->ports[cable];
 446                         int length;
 447
 448                         length = snd_usbmidi_cin_length[cin];
 449                         if (cin == 0xf && buffer[i + 1] >= 0xf8)
 450                                 ; /* realtime msg: no running status change */
 451                         else if (cin >= 0x8 && cin <= 0xe)
 452                                 /* channel msg */
 453                                 port->running_status_length = length - 1;
 454                         else if (cin == 0x4 &&
 455                                  port->running_status_length != 0 &&
 456                                  buffer[i + 1] < 0x80)
 457                                 /* CIN 4 that is not a SysEx */
 458                                 length = port->running_status_length;
 459                         else
 460                                 /*
 461                                  * All other msgs cannot begin running status.
 462                                  * (A channel msg sent as two or three CIN 0xF
 463                                  * packets could in theory, but this device
 464                                  * doesn't use this format.)
 465                                  */
 466                                 port->running_status_length = 0;
 467                         snd_usbmidi_input_data(ep, cable, &buffer[i + 1],
 468                                                length);
 469                 }
 470 }
 471
 472 /*
 473  * QinHeng CH345 is buggy: every second packet inside a SysEx has not CIN 4
 474  * but the previously seen CIN, but still with three data bytes.
 475  */
 476 static void ch345_broken_sysex_input(struct snd_usb_midi_in_endpoint *ep,
 477                                      uint8_t *buffer, int buffer_length)
 478 {
 479         unsigned int i, cin, length;
 480
 481         for (i = 0; i + 3 < buffer_length; i += 4) {
 482                 if (buffer[i] == 0 && i > 0)
 483                         break;
 484                 cin = buffer[i] & 0x0f;
 485                 if (ep->in_sysex &&
 486                     cin == ep->last_cin &&
 487                     (buffer[i + 1 + (cin == 0x6)] & 0x80) == 0)
 488                         cin = 0x4;
 489 #if 0
 490                 if (buffer[i + 1] == 0x90) {
 491                         /*
 492                          * Either a corrupted running status or a real note-on
 493                          * message; impossible to detect reliably.
 494                          */
 495                 }
 496 #endif
 497                 length = snd_usbmidi_cin_length[cin];
 498                 snd_usbmidi_input_data(ep, 0, &buffer[i + 1], length);
 499                 ep->in_sysex = cin == 0x4;
 500                 if (!ep->in_sysex)
 501                         ep->last_cin = cin;
 502         }
 503 }
 504
 505 /*
 506  * CME protocol: like the standard protocol, but SysEx commands are sent as a
 507  * single USB packet preceded by a 0x0F byte.
 508  */
 509 static void snd_usbmidi_cme_input(struct snd_usb_midi_in_endpoint *ep,
 510                                   uint8_t *buffer, int buffer_length)
 511 {
 512         if (buffer_length < 2 || (buffer[0] & 0x0f) != 0x0f)
 513                 snd_usbmidi_standard_input(ep, buffer, buffer_length);
 514         else
 515                 snd_usbmidi_input_data(ep, buffer[0] >> 4,
 516                                        &buffer[1], buffer_length - 1);
 517 }
 518
 519 /*
 520  * Adds one USB MIDI packet to the output buffer.
 521  */
 522 static void snd_usbmidi_output_standard_packet(struct urb *urb, uint8_t p0,
 523                                                uint8_t p1, uint8_t p2,
 524                                                uint8_t p3)
 525 {
 526
 527         uint8_t *buf =
 528                 (uint8_t *)urb->transfer_buffer + urb->transfer_buffer_length;
 529         buf[0] = p0;
 530         buf[1] = p1;
 531         buf[2] = p2;
 532         buf[3] = p3;
 533         urb->transfer_buffer_length += 4;
 534 }
 535
 536 /*
 537  * Adds one Midiman packet to the output buffer.
 538  */
 539 static void snd_usbmidi_output_midiman_packet(struct urb *urb, uint8_t p0,
 540                                               uint8_t p1, uint8_t p2,
 541                                               uint8_t p3)
 542 {
 543
 544         uint8_t *buf =
 545                 (uint8_t *)urb->transfer_buffer + urb->transfer_buffer_length;
 546         buf[0] = p1;
 547         buf[1] = p2;
 548         buf[2] = p3;
 549         buf[3] = (p0 & 0xf0) | snd_usbmidi_cin_length[p0 & 0x0f];
 550         urb->transfer_buffer_length += 4;
 551 }
 552
 553 /*
 554  * Converts MIDI commands to USB MIDI packets.
 555  */
 556 static void snd_usbmidi_transmit_byte(struct usbmidi_out_port *port,
 557                                       uint8_t b, struct urb *urb)
 558 {
 559         uint8_t p0 = port->cable;
 560         void (*output_packet)(struct urb*, uint8_t, uint8_t, uint8_t, uint8_t) =
 561                 port->ep->umidi->usb_protocol_ops->output_packet;
 562
 563         if (b >= 0xf8) {
 564                 output_packet(urb, p0 | 0x0f, b, 0, 0);
 565         } else if (b >= 0xf0) {
 566                 switch (b) {
 567                 case 0xf0:
 568                         port->data[0] = b;
 569                         port->state = STATE_SYSEX_1;
 570                         break;
 571                 case 0xf1:
 572                 case 0xf3:
 573                         port->data[0] = b;
 574                         port->state = STATE_1PARAM;
 575                         break;
 576                 case 0xf2:
 577                         port->data[0] = b;
 578                         port->state = STATE_2PARAM_1;
 579                         break;
 580                 case 0xf4:
 581                 case 0xf5:
 582                         port->state = STATE_UNKNOWN;
 583                         break;
 584                 case 0xf6:
 585                         output_packet(urb, p0 | 0x05, 0xf6, 0, 0);
 586                         port->state = STATE_UNKNOWN;
 587                         break;
 588                 case 0xf7:
 589                         switch (port->state) {
 590                         case STATE_SYSEX_0:
 591                                 output_packet(urb, p0 | 0x05, 0xf7, 0, 0);
 592                                 break;
 593                         case STATE_SYSEX_1:
 594                                 output_packet(urb, p0 | 0x06, port->data[0],
 595                                               0xf7, 0);
 596                                 break;
 597                         case STATE_SYSEX_2:
 598                                 output_packet(urb, p0 | 0x07, port->data[0],
 599                                               port->data[1], 0xf7);
 600                                 break;
 601                         }
 602                         port->state = STATE_UNKNOWN;
 603                         break;
 604                 }
 605         } else if (b >= 0x80) {
 606                 port->data[0] = b;
 607                 if (b >= 0xc0 && b <= 0xdf)
 608                         port->state = STATE_1PARAM;
 609                 else
 610                         port->state = STATE_2PARAM_1;
 611         } else { /* b < 0x80 */
 612                 switch (port->state) {
 613                 case STATE_1PARAM:
 614                         if (port->data[0] < 0xf0) {
 615                                 p0 |= port->data[0] >> 4;
 616                         } else {
 617                                 p0 |= 0x02;
 618                                 port->state = STATE_UNKNOWN;
 619                         }
 620                         output_packet(urb, p0, port->data[0], b, 0);
 621                         break;
 622                 case STATE_2PARAM_1:
 623                         port->data[1] = b;
 624                         port->state = STATE_2PARAM_2;
 625                         break;
 626                 case STATE_2PARAM_2:
 627                         if (port->data[0] < 0xf0) {
 628                                 p0 |= port->data[0] >> 4;
 629                                 port->state = STATE_2PARAM_1;
 630                         } else {
 631                                 p0 |= 0x03;
 632                                 port->state = STATE_UNKNOWN;
 633                         }
 634                         output_packet(urb, p0, port->data[0], port->data[1], b);
 635                         break;
 636                 case STATE_SYSEX_0:
 637                         port->data[0] = b;
 638                         port->state = STATE_SYSEX_1;
 639                         break;
 640                 case STATE_SYSEX_1:
 641                         port->data[1] = b;
 642                         port->state = STATE_SYSEX_2;
 643                         break;
 644                 case STATE_SYSEX_2:
 645                         output_packet(urb, p0 | 0x04, port->data[0],
 646                                       port->data[1], b);
 647                         port->state = STATE_SYSEX_0;
 648                         break;
 649                 }
 650         }
 651 }
 652
 653 static void snd_usbmidi_standard_output(struct snd_usb_midi_out_endpoint *ep,
 654                                         struct urb *urb)
 655 {
 656         int p;
 657
 658         /* FIXME: lower-numbered ports can starve higher-numbered ports */
 659         for (p = 0; p < 0x10; ++p) {
 660                 struct usbmidi_out_port *port = &ep->ports[p];
 661                 if (!port->active)
 662                         continue;
 663                 while (urb->transfer_buffer_length + 3 < ep->max_transfer) {
 664                         uint8_t b;
 665                         if (snd_rawmidi_transmit(port->substream, &b, 1) != 1) {
 666                                 port->active = 0;
 667                                 break;
 668                         }
 669                         snd_usbmidi_transmit_byte(port, b, urb);
 670                 }
 671         }
 672 }
 673
 674 static const struct usb_protocol_ops snd_usbmidi_standard_ops = {
 675         .input = snd_usbmidi_standard_input,
 676         .output = snd_usbmidi_standard_output,
 677         .output_packet = snd_usbmidi_output_standard_packet,
 678 };
 679
 680 static const struct usb_protocol_ops snd_usbmidi_midiman_ops = {
 681         .input = snd_usbmidi_midiman_input,
 682         .output = snd_usbmidi_standard_output,
 683         .output_packet = snd_usbmidi_output_midiman_packet,
 684 };
 685
 686 static const
 687 struct usb_protocol_ops snd_usbmidi_maudio_broken_running_status_ops = {
 688         .input = snd_usbmidi_maudio_broken_running_status_input,
 689         .output = snd_usbmidi_standard_output,
 690         .output_packet = snd_usbmidi_output_standard_packet,
 691 };
 692
 693 static const struct usb_protocol_ops snd_usbmidi_cme_ops = {
 694         .input = snd_usbmidi_cme_input,
 695         .output = snd_usbmidi_standard_output,
 696         .output_packet = snd_usbmidi_output_standard_packet,
 697 };
 698
 699 static const struct usb_protocol_ops snd_usbmidi_ch345_broken_sysex_ops = {
 700         .input = ch345_broken_sysex_input,
 701         .output = snd_usbmidi_standard_output,
 702         .output_packet = snd_usbmidi_output_standard_packet,
 703 };
 704
 705 /*
 706  * AKAI MPD16 protocol:
 707  *
 708  * For control port (endpoint 1):
 709  * ==============================
 710  * One or more chunks consisting of first byte of (0x10 | msg_len) and then a
 711  * SysEx message (msg_len=9 bytes long).
 712  *
 713  * For data port (endpoint 2):
 714  * ===========================
 715  * One or more chunks consisting of first byte of (0x20 | msg_len) and then a
 716  * MIDI message (msg_len bytes long)
 717  *
 718  * Messages sent: Active Sense, Note On, Poly Pressure, Control Change.
 719  */
 720 static void snd_usbmidi_akai_input(struct snd_usb_midi_in_endpoint *ep,
 721                                    uint8_t *buffer, int buffer_length)
 722 {
 723         unsigned int pos = 0;
 724         unsigned int len = (unsigned int)buffer_length;
 725         while (pos < len) {
 726                 unsigned int port = (buffer[pos] >> 4) - 1;
 727                 unsigned int msg_len = buffer[pos] & 0x0f;
 728                 pos++;
 729                 if (pos + msg_len <= len && port < 2)
 730                         snd_usbmidi_input_data(ep, 0, &buffer[pos], msg_len);
 731                 pos += msg_len;
 732         }
 733 }
 734
 735 #define MAX_AKAI_SYSEX_LEN 9
 736
 737 static void snd_usbmidi_akai_output(struct snd_usb_midi_out_endpoint *ep,
 738                                     struct urb *urb)
 739 {
 740         uint8_t *msg;
 741         int pos, end, count, buf_end;
 742         uint8_t tmp[MAX_AKAI_SYSEX_LEN];
 743         struct snd_rawmidi_substream *substream = ep->ports[0].substream;
 744
 745         if (!ep->ports[0].active)
 746                 return;
 747
 748         msg = urb->transfer_buffer + urb->transfer_buffer_length;
 749         buf_end = ep->max_transfer - MAX_AKAI_SYSEX_LEN - 1;
 750
 751         /* only try adding more data when there's space for at least 1 SysEx */
 752         while (urb->transfer_buffer_length < buf_end) {
 753                 count = snd_rawmidi_transmit_peek(substream,
 754                                                   tmp, MAX_AKAI_SYSEX_LEN);
 755                 if (!count) {
 756                         ep->ports[0].active = 0;
 757                         return;
 758                 }
 759                 /* try to skip non-SysEx data */
 760                 for (pos = 0; pos < count && tmp[pos] != 0xF0; pos++)
 761                         ;
 762
 763                 if (pos > 0) {
 764                         snd_rawmidi_transmit_ack(substream, pos);
 765                         continue;
 766                 }
 767
 768                 /* look for the start or end marker */
 769                 for (end = 1; end < count && tmp[end] < 0xF0; end++)
 770                         ;
 771
 772                 /* next SysEx started before the end of current one */
 773                 if (end < count && tmp[end] == 0xF0) {
 774                         /* it's incomplete - drop it */
 775                         snd_rawmidi_transmit_ack(substream, end);
 776                         continue;
 777                 }
 778                 /* SysEx complete */
 779                 if (end < count && tmp[end] == 0xF7) {
 780                         /* queue it, ack it, and get the next one */
 781                         count = end + 1;
 782                         msg[0] = 0x10 | count;
 783                         memcpy(&msg[1], tmp, count);
 784                         snd_rawmidi_transmit_ack(substream, count);
 785                         urb->transfer_buffer_length += count + 1;
 786                         msg += count + 1;
 787                         continue;
 788                 }
 789                 /* less than 9 bytes and no end byte - wait for more */
 790                 if (count < MAX_AKAI_SYSEX_LEN) {
 791                         ep->ports[0].active = 0;
 792                         return;
 793                 }
 794                 /* 9 bytes and no end marker in sight - malformed, skip it */
 795                 snd_rawmidi_transmit_ack(substream, count);
 796         }
 797 }
 798
 799 static const struct usb_protocol_ops snd_usbmidi_akai_ops = {
 800         .input = snd_usbmidi_akai_input,
 801         .output = snd_usbmidi_akai_output,
 802 };
 803
 804 /*
 805  * Novation USB MIDI protocol: number of data bytes is in the first byte
 806  * (when receiving) (+1!) or in the second byte (when sending); data begins
 807  * at the third byte.
 808  */
 809
 810 static void snd_usbmidi_novation_input(struct snd_usb_midi_in_endpoint *ep,
 811                                        uint8_t *buffer, int buffer_length)
 812 {
 813         if (buffer_length < 2 || !buffer[0] || buffer_length < buffer[0] + 1)
 814                 return;
 815         snd_usbmidi_input_data(ep, 0, &buffer[2], buffer[0] - 1);
 816 }
 817
 818 static void snd_usbmidi_novation_output(struct snd_usb_midi_out_endpoint *ep,
 819                                         struct urb *urb)
 820 {
 821         uint8_t *transfer_buffer;
 822         int count;
 823
 824         if (!ep->ports[0].active)
 825                 return;
 826         transfer_buffer = urb->transfer_buffer;
 827         count = snd_rawmidi_transmit(ep->ports[0].substream,
 828                                      &transfer_buffer[2],
 829                                      ep->max_transfer - 2);
 830         if (count < 1) {
 831                 ep->ports[0].active = 0;
 832                 return;
 833         }
 834         transfer_buffer[0] = 0;
 835         transfer_buffer[1] = count;
 836         urb->transfer_buffer_length = 2 + count;
 837 }
 838
 839 static const struct usb_protocol_ops snd_usbmidi_novation_ops = {
 840         .input = snd_usbmidi_novation_input,
 841         .output = snd_usbmidi_novation_output,
 842 };
 843
 844 /*
 845  * "raw" protocol: just move raw MIDI bytes from/to the endpoint
 846  */
 847
 848 static void snd_usbmidi_raw_input(struct snd_usb_midi_in_endpoint *ep,
 849                                   uint8_t *buffer, int buffer_length)
 850 {
 851         snd_usbmidi_input_data(ep, 0, buffer, buffer_length);
 852 }
 853
 854 static void snd_usbmidi_raw_output(struct snd_usb_midi_out_endpoint *ep,
 855                                    struct urb *urb)
 856 {
 857         int count;
 858
 859         if (!ep->ports[0].active)
 860                 return;
 861         count = snd_rawmidi_transmit(ep->ports[0].substream,
 862                                      urb->transfer_buffer,
 863                                      ep->max_transfer);
 864         if (count < 1) {
 865                 ep->ports[0].active = 0;
 866                 return;
 867         }
 868         urb->transfer_buffer_length = count;
 869 }
 870
 871 static const struct usb_protocol_ops snd_usbmidi_raw_ops = {
 872         .input = snd_usbmidi_raw_input,
 873         .output = snd_usbmidi_raw_output,
 874 };
 875
 876 /*
 877  * FTDI protocol: raw MIDI bytes, but input packets have two modem status bytes.
 878  */
 879
 880 static void snd_usbmidi_ftdi_input(struct snd_usb_midi_in_endpoint *ep,
 881                                    uint8_t *buffer, int buffer_length)
 882 {
 883         if (buffer_length > 2)
 884                 snd_usbmidi_input_data(ep, 0, buffer + 2, buffer_length - 2);
 885 }
 886
 887 static const struct usb_protocol_ops snd_usbmidi_ftdi_ops = {
 888         .input = snd_usbmidi_ftdi_input,
 889         .output = snd_usbmidi_raw_output,
 890 };
 891
 892 static void snd_usbmidi_us122l_input(struct snd_usb_midi_in_endpoint *ep,
 893                                      uint8_t *buffer, int buffer_length)
 894 {
 895         if (buffer_length != 9)
 896                 return;
 897         buffer_length = 8;
 898         while (buffer_length && buffer[buffer_length - 1] == 0xFD)
 899                 buffer_length--;
 900         if (buffer_length)
 901                 snd_usbmidi_input_data(ep, 0, buffer, buffer_length);
 902 }
 903
 904 static void snd_usbmidi_us122l_output(struct snd_usb_midi_out_endpoint *ep,
 905                                       struct urb *urb)
 906 {
 907         int count;
 908
 909         if (!ep->ports[0].active)
 910                 return;
 911         switch (snd_usb_get_speed(ep->umidi->dev)) {
 912         case USB_SPEED_HIGH:
 913         case USB_SPEED_SUPER:
 914                 count = 1;
 915                 break;
 916         default:
 917                 count = 2;
 918         }
 919         count = snd_rawmidi_transmit(ep->ports[0].substream,
 920                                      urb->transfer_buffer,
 921                                      count);
 922         if (count < 1) {
 923                 ep->ports[0].active = 0;
 924                 return;
 925         }
 926
 927         memset(urb->transfer_buffer + count, 0xFD, ep->max_transfer - count);
 928         urb->transfer_buffer_length = ep->max_transfer;
 929 }
 930
 931 static const struct usb_protocol_ops snd_usbmidi_122l_ops = {
 932         .input = snd_usbmidi_us122l_input,
 933         .output = snd_usbmidi_us122l_output,
 934 };
 935
 936 /*
 937  * Emagic USB MIDI protocol: raw MIDI with "F5 xx" port switching.
 938  */
 939
 940 static void snd_usbmidi_emagic_init_out(struct snd_usb_midi_out_endpoint *ep)
 941 {
 942         static const u8 init_data[] = {
 943                 /* initialization magic: "get version" */
 944                 0xf0,
 945                 0x00, 0x20, 0x31,       /* Emagic */
 946                 0x64,                   /* Unitor8 */
 947                 0x0b,                   /* version number request */
 948                 0x00,                   /* command version */
 949                 0x00,                   /* EEPROM, box 0 */
 950                 0xf7
 951         };
 952         send_bulk_static_data(ep, init_data, sizeof(init_data));
 953         /* while we're at it, pour on more magic */
 954         send_bulk_static_data(ep, init_data, sizeof(init_data));
 955 }
 956
 957 static void snd_usbmidi_emagic_finish_out(struct snd_usb_midi_out_endpoint *ep)
 958 {
 959         static const u8 finish_data[] = {
 960                 /* switch to patch mode with last preset */
 961                 0xf0,
 962                 0x00, 0x20, 0x31,       /* Emagic */
 963                 0x64,                   /* Unitor8 */
 964                 0x10,                   /* patch switch command */
 965                 0x00,                   /* command version */
 966                 0x7f,                   /* to all boxes */
 967                 0x40,                   /* last preset in EEPROM */
 968                 0xf7
 969         };
 970         send_bulk_static_data(ep, finish_data, sizeof(finish_data));
 971 }
 972
 973 static void snd_usbmidi_emagic_input(struct snd_usb_midi_in_endpoint *ep,
 974                                      uint8_t *buffer, int buffer_length)
 975 {
 976         int i;
 977
 978         /* FF indicates end of valid data */
 979         for (i = 0; i < buffer_length; ++i)
 980                 if (buffer[i] == 0xff) {
 981                         buffer_length = i;
 982                         break;
 983                 }
 984
 985         /* handle F5 at end of last buffer */
 986         if (ep->seen_f5)
 987                 goto switch_port;
 988
 989         while (buffer_length > 0) {
 990                 /* determine size of data until next F5 */
 991                 for (i = 0; i < buffer_length; ++i)
 992                         if (buffer[i] == 0xf5)
 993                                 break;
 994                 snd_usbmidi_input_data(ep, ep->current_port, buffer, i);
 995                 buffer += i;
 996                 buffer_length -= i;
 997
 998                 if (buffer_length <= 0)
 999                         break;
1000                 /* assert(buffer[0] == 0xf5); */
1001                 ep->seen_f5 = 1;
1002                 ++buffer;
1003                 --buffer_length;
1004
1005         switch_port:
1006                 if (buffer_length <= 0)
1007                         break;
1008                 if (buffer[0] < 0x80) {
1009                         ep->current_port = (buffer[0] - 1) & 15;
1010                         ++buffer;
1011                         --buffer_length;
1012                 }
1013                 ep->seen_f5 = 0;
1014         }
1015 }
1016
1017 static void snd_usbmidi_emagic_output(struct snd_usb_midi_out_endpoint *ep,
1018                                       struct urb *urb)
1019 {
1020         int port0 = ep->current_port;
1021         uint8_t *buf = urb->transfer_buffer;
1022         int buf_free = ep->max_transfer;
1023         int length, i;
1024
1025         for (i = 0; i < 0x10; ++i) {
1026                 /* round-robin, starting at the last current port */
1027                 int portnum = (port0 + i) & 15;
1028                 struct usbmidi_out_port *port = &ep->ports[portnum];
1029
1030                 if (!port->active)
1031                         continue;
1032                 if (snd_rawmidi_transmit_peek(port->substream, buf, 1) != 1) {
1033                         port->active = 0;
1034                         continue;
1035                 }
1036
1037                 if (portnum != ep->current_port) {
1038                         if (buf_free < 2)
1039                                 break;
1040                         ep->current_port = portnum;
1041                         buf[0] = 0xf5;
1042                         buf[1] = (portnum + 1) & 15;
1043                         buf += 2;
1044                         buf_free -= 2;
1045                 }
1046
1047                 if (buf_free < 1)
1048                         break;
1049                 length = snd_rawmidi_transmit(port->substream, buf, buf_free);
1050                 if (length > 0) {
1051                         buf += length;
1052                         buf_free -= length;
1053                         if (buf_free < 1)
1054                                 break;
1055                 }
1056         }
1057         if (buf_free < ep->max_transfer && buf_free > 0) {
1058                 *buf = 0xff;
1059                 --buf_free;
1060         }
1061         urb->transfer_buffer_length = ep->max_transfer - buf_free;
1062 }
1063
1064 static const struct usb_protocol_ops snd_usbmidi_emagic_ops = {
1065         .input = snd_usbmidi_emagic_input,
1066         .output = snd_usbmidi_emagic_output,
1067         .init_out_endpoint = snd_usbmidi_emagic_init_out,
1068         .finish_out_endpoint = snd_usbmidi_emagic_finish_out,
1069 };
1070
1071
1072 static void update_roland_altsetting(struct snd_usb_midi *umidi)
1073 {
1074         struct usb_interface *intf;
1075         struct usb_host_interface *hostif;
1076         struct usb_interface_descriptor *intfd;
1077         int is_light_load;
1078
1079         intf = umidi->iface;
1080         is_light_load = intf->cur_altsetting != intf->altsetting;
1081         if (umidi->roland_load_ctl->private_value == is_light_load)
1082                 return;
1083         hostif = &intf->altsetting[umidi->roland_load_ctl->private_value];
1084         intfd = get_iface_desc(hostif);
1085         snd_usbmidi_input_stop(&umidi->list);
1086         usb_set_interface(umidi->dev, intfd->bInterfaceNumber,
1087                           intfd->bAlternateSetting);
1088         snd_usbmidi_input_start(&umidi->list);
1089 }
1090
1091 static int substream_open(struct snd_rawmidi_substream *substream, int dir,
1092                           int open)
1093 {
1094         struct snd_usb_midi *umidi = substream->rmidi->private_data;
1095         struct snd_kcontrol *ctl;
1096
1097         down_read(&umidi->disc_rwsem);
1098         if (umidi->disconnected) {
1099                 up_read(&umidi->disc_rwsem);
1100                 return open ? -ENODEV : 0;
1101         }
1102
1103         mutex_lock(&umidi->mutex);
1104         if (open) {
1105                 if (!umidi->opened[0] && !umidi->opened[1]) {
1106                         if (umidi->roland_load_ctl) {
1107                                 ctl = umidi->roland_load_ctl;
1108                                 ctl->vd[0].access |=
1109                                         SNDRV_CTL_ELEM_ACCESS_INACTIVE;
1110                                 snd_ctl_notify(umidi->card,
1111                                        SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
1112                                 update_roland_altsetting(umidi);
1113                         }
1114                 }
1115                 umidi->opened[dir]++;
1116                 if (umidi->opened[1])
1117                         snd_usbmidi_input_start(&umidi->list);
1118         } else {
1119                 umidi->opened[dir]--;
1120                 if (!umidi->opened[1])
1121                         snd_usbmidi_input_stop(&umidi->list);
1122                 if (!umidi->opened[0] && !umidi->opened[1]) {
1123                         if (umidi->roland_load_ctl) {
1124                                 ctl = umidi->roland_load_ctl;
1125                                 ctl->vd[0].access &=
1126                                         ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
1127                                 snd_ctl_notify(umidi->card,
1128                                        SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
1129                         }
1130                 }
1131         }
1132         mutex_unlock(&umidi->mutex);
1133         up_read(&umidi->disc_rwsem);
1134         return 0;
1135 }
1136
1137 static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
1138 {
1139         struct snd_usb_midi *umidi = substream->rmidi->private_data;
1140         struct usbmidi_out_port *port = NULL;
1141         int i, j;
1142
1143         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
1144                 if (umidi->endpoints[i].out)
1145                         for (j = 0; j < 0x10; ++j)
1146                                 if (umidi->endpoints[i].out->ports[j].substream == substream) {
1147                                         port = &umidi->endpoints[i].out->ports[j];
1148                                         break;
1149                                 }
1150         if (!port) {
1151                 snd_BUG();
1152                 return -ENXIO;
1153         }
1154
1155         substream->runtime->private_data = port;
1156         port->state = STATE_UNKNOWN;
1157         return substream_open(substream, 0, 1);
1158 }
1159
1160 static int snd_usbmidi_output_close(struct snd_rawmidi_substream *substream)
1161 {
1162         return substream_open(substream, 0, 0);
1163 }
1164
1165 static void snd_usbmidi_output_trigger(struct snd_rawmidi_substream *substream,
1166                                        int up)
1167 {
1168         struct usbmidi_out_port *port =
1169                 (struct usbmidi_out_port *)substream->runtime->private_data;
1170
1171         port->active = up;
1172         if (up) {
1173                 if (port->ep->umidi->disconnected) {
1174                         /* gobble up remaining bytes to prevent wait in
1175                          * snd_rawmidi_drain_output */
1176                         while (!snd_rawmidi_transmit_empty(substream))
1177                                 snd_rawmidi_transmit_ack(substream, 1);
1178                         return;
1179                 }
1180                 tasklet_schedule(&port->ep->tasklet);
1181         }
1182 }
1183
1184 static void snd_usbmidi_output_drain(struct snd_rawmidi_substream *substream)
1185 {
1186         struct usbmidi_out_port *port = substream->runtime->private_data;
1187         struct snd_usb_midi_out_endpoint *ep = port->ep;
1188         unsigned int drain_urbs;
1189         DEFINE_WAIT(wait);
1190         long timeout = msecs_to_jiffies(50);
1191
1192         if (ep->umidi->disconnected)
1193                 return;
1194         /*
1195          * The substream buffer is empty, but some data might still be in the
1196          * currently active URBs, so we have to wait for those to complete.
1197          */
1198         spin_lock_irq(&ep->buffer_lock);
1199         drain_urbs = ep->active_urbs;
1200         if (drain_urbs) {
1201                 ep->drain_urbs |= drain_urbs;
1202                 do {
1203                         prepare_to_wait(&ep->drain_wait, &wait,
1204                                         TASK_UNINTERRUPTIBLE);
1205                         spin_unlock_irq(&ep->buffer_lock);
1206                         timeout = schedule_timeout(timeout);
1207                         spin_lock_irq(&ep->buffer_lock);
1208                         drain_urbs &= ep->drain_urbs;
1209                 } while (drain_urbs && timeout);
1210                 finish_wait(&ep->drain_wait, &wait);
1211         }
1212         spin_unlock_irq(&ep->buffer_lock);
1213 }
1214
1215 static int snd_usbmidi_input_open(struct snd_rawmidi_substream *substream)
1216 {
1217         return substream_open(substream, 1, 1);
1218 }
1219
1220 static int snd_usbmidi_input_close(struct snd_rawmidi_substream *substream)
1221 {
1222         return substream_open(substream, 1, 0);
1223 }
1224
1225 static void snd_usbmidi_input_trigger(struct snd_rawmidi_substream *substream,
1226                                       int up)
1227 {
1228         struct snd_usb_midi *umidi = substream->rmidi->private_data;
1229
1230         if (up)
1231                 set_bit(substream->number, &umidi->input_triggered);
1232         else
1233                 clear_bit(substream->number, &umidi->input_triggered);
1234 }
1235
1236 static struct snd_rawmidi_ops snd_usbmidi_output_ops = {
1237         .open = snd_usbmidi_output_open,
1238         .close = snd_usbmidi_output_close,
1239         .trigger = snd_usbmidi_output_trigger,
1240         .drain = snd_usbmidi_output_drain,
1241 };
1242
1243 static struct snd_rawmidi_ops snd_usbmidi_input_ops = {
1244         .open = snd_usbmidi_input_open,
1245         .close = snd_usbmidi_input_close,
1246         .trigger = snd_usbmidi_input_trigger
1247 };
1248
1249 static void free_urb_and_buffer(struct snd_usb_midi *umidi, struct urb *urb,
1250                                 unsigned int buffer_length)
1251 {
1252         usb_free_coherent(umidi->dev, buffer_length,
1253                           urb->transfer_buffer, urb->transfer_dma);
1254         usb_free_urb(urb);
1255 }
1256
1257 /*
1258  * Frees an input endpoint.
1259  * May be called when ep hasn't been initialized completely.
1260  */
1261 static void snd_usbmidi_in_endpoint_delete(struct snd_usb_midi_in_endpoint *ep)
1262 {
1263         unsigned int i;
1264
1265         for (i = 0; i < INPUT_URBS; ++i)
1266                 if (ep->urbs[i])
1267                         free_urb_and_buffer(ep->umidi, ep->urbs[i],
1268                                             ep->urbs[i]->transfer_buffer_length);
1269         kfree(ep);
1270 }
1271
1272 /*
1273  * Creates an input endpoint.
1274  */
1275 static int snd_usbmidi_in_endpoint_create(struct snd_usb_midi *umidi,
1276                                           struct snd_usb_midi_endpoint_info *ep_info,
1277                                           struct snd_usb_midi_endpoint *rep)
1278 {
1279         struct snd_usb_midi_in_endpoint *ep;
1280         void *buffer;
1281         unsigned int pipe;
1282         int length;
1283         unsigned int i;
1284
1285         rep->in = NULL;
1286         ep = kzalloc(sizeof(*ep), GFP_KERNEL);
1287         if (!ep)
1288                 return -ENOMEM;
1289         ep->umidi = umidi;
1290
1291         for (i = 0; i < INPUT_URBS; ++i) {
1292                 ep->urbs[i] = usb_alloc_urb(0, GFP_KERNEL);
1293                 if (!ep->urbs[i]) {
1294                         snd_usbmidi_in_endpoint_delete(ep);
1295                         return -ENOMEM;
1296                 }
1297         }
1298         if (ep_info->in_interval)
1299                 pipe = usb_rcvintpipe(umidi->dev, ep_info->in_ep);
1300         else
1301                 pipe = usb_rcvbulkpipe(umidi->dev, ep_info->in_ep);
1302         length = usb_maxpacket(umidi->dev, pipe, 0);
1303         for (i = 0; i < INPUT_URBS; ++i) {
1304                 buffer = usb_alloc_coherent(umidi->dev, length, GFP_KERNEL,
1305                                             &ep->urbs[i]->transfer_dma);
1306                 if (!buffer) {
1307                         snd_usbmidi_in_endpoint_delete(ep);
1308                         return -ENOMEM;
1309                 }
1310                 if (ep_info->in_interval)
1311                         usb_fill_int_urb(ep->urbs[i], umidi->dev,
1312                                          pipe, buffer, length,
1313                                          snd_usbmidi_in_urb_complete,
1314                                          ep, ep_info->in_interval);
1315                 else
1316                         usb_fill_bulk_urb(ep->urbs[i], umidi->dev,
1317                                           pipe, buffer, length,
1318                                           snd_usbmidi_in_urb_complete, ep);
1319                 ep->urbs[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1320         }
1321
1322         rep->in = ep;
1323         return 0;
1324 }
1325
1326 /*
1327  * Frees an output endpoint.
1328  * May be called when ep hasn't been initialized completely.
1329  */
1330 static void snd_usbmidi_out_endpoint_clear(struct snd_usb_midi_out_endpoint *ep)
1331 {
1332         unsigned int i;
1333
1334         for (i = 0; i < OUTPUT_URBS; ++i)
1335                 if (ep->urbs[i].urb) {
1336                         free_urb_and_buffer(ep->umidi, ep->urbs[i].urb,
1337                                             ep->max_transfer);
1338                         ep->urbs[i].urb = NULL;
1339                 }
1340 }
1341
1342 static void snd_usbmidi_out_endpoint_delete(struct snd_usb_midi_out_endpoint *ep)
1343 {
1344         snd_usbmidi_out_endpoint_clear(ep);
1345         kfree(ep);
1346 }
1347
1348 /*
1349  * Creates an output endpoint, and initializes output ports.
1350  */
1351 static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi *umidi,
1352                                            struct snd_usb_midi_endpoint_info *ep_info,
1353                                            struct snd_usb_midi_endpoint *rep)
1354 {
1355         struct snd_usb_midi_out_endpoint *ep;
1356         unsigned int i;
1357         unsigned int pipe;
1358         void *buffer;
1359
1360         rep->out = NULL;
1361         ep = kzalloc(sizeof(*ep), GFP_KERNEL);
1362         if (!ep)
1363                 return -ENOMEM;
1364         ep->umidi = umidi;
1365
1366         for (i = 0; i < OUTPUT_URBS; ++i) {
1367                 ep->urbs[i].urb = usb_alloc_urb(0, GFP_KERNEL);
1368                 if (!ep->urbs[i].urb) {
1369                         snd_usbmidi_out_endpoint_delete(ep);
1370                         return -ENOMEM;
1371                 }
1372                 ep->urbs[i].ep = ep;
1373         }
1374         if (ep_info->out_interval)
1375                 pipe = usb_sndintpipe(umidi->dev, ep_info->out_ep);
1376         else
1377                 pipe = usb_sndbulkpipe(umidi->dev, ep_info->out_ep);
1378         switch (umidi->usb_id) {
1379         default:
1380                 ep->max_transfer = usb_maxpacket(umidi->dev, pipe, 1);
1381                 break;
1382                 /*
1383                  * Various chips declare a packet size larger than 4 bytes, but
1384                  * do not actually work with larger packets:
1385                  */
1386         case USB_ID(0x0a67, 0x5011): /* Medeli DD305 */
1387         case USB_ID(0x0a92, 0x1020): /* ESI M4U */
1388         case USB_ID(0x1430, 0x474b): /* RedOctane GH MIDI INTERFACE */
1389         case USB_ID(0x15ca, 0x0101): /* Textech USB Midi Cable */
1390         case USB_ID(0x15ca, 0x1806): /* Textech USB Midi Cable */
1391         case USB_ID(0x1a86, 0x752d): /* QinHeng CH345 "USB2.0-MIDI" */
1392         case USB_ID(0xfc08, 0x0101): /* Unknown vendor Cable */
1393                 ep->max_transfer = 4;
1394                 break;
1395                 /*
1396                  * Some devices only work with 9 bytes packet size:
1397                  */
1398         case USB_ID(0x0644, 0x800E): /* Tascam US-122L */
1399         case USB_ID(0x0644, 0x800F): /* Tascam US-144 */
1400                 ep->max_transfer = 9;
1401                 break;
1402         }
1403         for (i = 0; i < OUTPUT_URBS; ++i) {
1404                 buffer = usb_alloc_coherent(umidi->dev,
1405                                             ep->max_transfer, GFP_KERNEL,
1406                                             &ep->urbs[i].urb->transfer_dma);
1407                 if (!buffer) {
1408                         snd_usbmidi_out_endpoint_delete(ep);
1409                         return -ENOMEM;
1410                 }
1411                 if (ep_info->out_interval)
1412                         usb_fill_int_urb(ep->urbs[i].urb, umidi->dev,
1413                                          pipe, buffer, ep->max_transfer,
1414                                          snd_usbmidi_out_urb_complete,
1415                                          &ep->urbs[i], ep_info->out_interval);
1416                 else
1417                         usb_fill_bulk_urb(ep->urbs[i].urb, umidi->dev,
1418                                           pipe, buffer, ep->max_transfer,
1419                                           snd_usbmidi_out_urb_complete,
1420                                           &ep->urbs[i]);
1421                 ep->urbs[i].urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1422         }
1423
1424         spin_lock_init(&ep->buffer_lock);
1425         tasklet_init(&ep->tasklet, snd_usbmidi_out_tasklet, (unsigned long)ep);
1426         init_waitqueue_head(&ep->drain_wait);
1427
1428         for (i = 0; i < 0x10; ++i)
1429                 if (ep_info->out_cables & (1 << i)) {
1430                         ep->ports[i].ep = ep;
1431                         ep->ports[i].cable = i << 4;
1432                 }
1433
1434         if (umidi->usb_protocol_ops->init_out_endpoint)
1435                 umidi->usb_protocol_ops->init_out_endpoint(ep);
1436
1437         rep->out = ep;
1438         return 0;
1439 }
1440
1441 /*
1442  * Frees everything.
1443  */
1444 static void snd_usbmidi_free(struct snd_usb_midi *umidi)
1445 {
1446         int i;
1447
1448         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1449                 struct snd_usb_midi_endpoint *ep = &umidi->endpoints[i];
1450                 if (ep->out)
1451                         snd_usbmidi_out_endpoint_delete(ep->out);
1452                 if (ep->in)
1453                         snd_usbmidi_in_endpoint_delete(ep->in);
1454         }
1455         mutex_destroy(&umidi->mutex);
1456         kfree(umidi);
1457 }
1458
1459 /*
1460  * Unlinks all URBs (must be done before the usb_device is deleted).
1461  */
1462 void snd_usbmidi_disconnect(struct list_head *p)
1463 {
1464         struct snd_usb_midi *umidi;
1465         unsigned int i, j;
1466
1467         umidi = list_entry(p, struct snd_usb_midi, list);
1468         /*
1469          * an URB's completion handler may start the timer and
1470          * a timer may submit an URB. To reliably break the cycle
1471          * a flag under lock must be used
1472          */
1473         down_write(&umidi->disc_rwsem);
1474         spin_lock_irq(&umidi->disc_lock);
1475         umidi->disconnected = 1;
1476         spin_unlock_irq(&umidi->disc_lock);
1477         up_write(&umidi->disc_rwsem);
1478
1479         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1480                 struct snd_usb_midi_endpoint *ep = &umidi->endpoints[i];
1481                 if (ep->out)
1482                         tasklet_kill(&ep->out->tasklet);
1483                 if (ep->out) {
1484                         for (j = 0; j < OUTPUT_URBS; ++j)
1485                                 usb_kill_urb(ep->out->urbs[j].urb);
1486                         if (umidi->usb_protocol_ops->finish_out_endpoint)
1487                                 umidi->usb_protocol_ops->finish_out_endpoint(ep->out);
1488                         ep->out->active_urbs = 0;
1489                         if (ep->out->drain_urbs) {
1490                                 ep->out->drain_urbs = 0;
1491                                 wake_up(&ep->out->drain_wait);
1492                         }
1493                 }
1494                 if (ep->in)
1495                         for (j = 0; j < INPUT_URBS; ++j)
1496                                 usb_kill_urb(ep->in->urbs[j]);
1497                 /* free endpoints here; later call can result in Oops */
1498                 if (ep->out)
1499                         snd_usbmidi_out_endpoint_clear(ep->out);
1500                 if (ep->in) {
1501                         snd_usbmidi_in_endpoint_delete(ep->in);
1502                         ep->in = NULL;
1503                 }
1504         }
1505         del_timer_sync(&umidi->error_timer);
1506 }
1507 EXPORT_SYMBOL(snd_usbmidi_disconnect);
1508
1509 static void snd_usbmidi_rawmidi_free(struct snd_rawmidi *rmidi)
1510 {
1511         struct snd_usb_midi *umidi = rmidi->private_data;
1512         snd_usbmidi_free(umidi);
1513 }
1514
1515 static struct snd_rawmidi_substream *snd_usbmidi_find_substream(struct snd_usb_midi *umidi,
1516                                                                 int stream,
1517                                                                 int number)
1518 {
1519         struct snd_rawmidi_substream *substream;
1520
1521         list_for_each_entry(substream, &umidi->rmidi->streams[stream].substreams,
1522                             list) {
1523                 if (substream->number == number)
1524                         return substream;
1525         }
1526         return NULL;
1527 }
1528
1529 /*
1530  * This list specifies names for ports that do not fit into the standard
1531  * "(product) MIDI (n)" schema because they aren't external MIDI ports,
1532  * such as internal control or synthesizer ports.
1533  */
1534 static struct port_info {
1535         u32 id;
1536         short int port;
1537         short int voices;
1538         const char *name;
1539         unsigned int seq_flags;
1540 } snd_usbmidi_port_info[] = {
1541 #define PORT_INFO(vendor, product, num, name_, voices_, flags) \
1542         { .id = USB_ID(vendor, product), \
1543           .port = num, .voices = voices_, \
1544           .name = name_, .seq_flags = flags }
1545 #define EXTERNAL_PORT(vendor, product, num, name) \
1546         PORT_INFO(vendor, product, num, name, 0, \
1547                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1548                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1549                   SNDRV_SEQ_PORT_TYPE_PORT)
1550 #define CONTROL_PORT(vendor, product, num, name) \
1551         PORT_INFO(vendor, product, num, name, 0, \
1552                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1553                   SNDRV_SEQ_PORT_TYPE_HARDWARE)
1554 #define GM_SYNTH_PORT(vendor, product, num, name, voices) \
1555         PORT_INFO(vendor, product, num, name, voices, \
1556                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1557                   SNDRV_SEQ_PORT_TYPE_MIDI_GM | \
1558                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1559                   SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
1560 #define ROLAND_SYNTH_PORT(vendor, product, num, name, voices) \
1561         PORT_INFO(vendor, product, num, name, voices, \
1562                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1563                   SNDRV_SEQ_PORT_TYPE_MIDI_GM | \
1564                   SNDRV_SEQ_PORT_TYPE_MIDI_GM2 | \
1565                   SNDRV_SEQ_PORT_TYPE_MIDI_GS | \
1566                   SNDRV_SEQ_PORT_TYPE_MIDI_XG | \
1567                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1568                   SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
1569 #define SOUNDCANVAS_PORT(vendor, product, num, name, voices) \
1570         PORT_INFO(vendor, product, num, name, voices, \
1571                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1572                   SNDRV_SEQ_PORT_TYPE_MIDI_GM | \
1573                   SNDRV_SEQ_PORT_TYPE_MIDI_GM2 | \
1574                   SNDRV_SEQ_PORT_TYPE_MIDI_GS | \
1575                   SNDRV_SEQ_PORT_TYPE_MIDI_XG | \
1576                   SNDRV_SEQ_PORT_TYPE_MIDI_MT32 | \
1577                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1578                   SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
1579         /* Yamaha MOTIF XF */
1580         GM_SYNTH_PORT(0x0499, 0x105c, 0, "%s Tone Generator", 128),
1581         CONTROL_PORT(0x0499, 0x105c, 1, "%s Remote Control"),
1582         EXTERNAL_PORT(0x0499, 0x105c, 2, "%s Thru"),
1583         CONTROL_PORT(0x0499, 0x105c, 3, "%s Editor"),
1584         /* Roland UA-100 */
1585         CONTROL_PORT(0x0582, 0x0000, 2, "%s Control"),
1586         /* Roland SC-8850 */
1587         SOUNDCANVAS_PORT(0x0582, 0x0003, 0, "%s Part A", 128),
1588         SOUNDCANVAS_PORT(0x0582, 0x0003, 1, "%s Part B", 128),
1589         SOUNDCANVAS_PORT(0x0582, 0x0003, 2, "%s Part C", 128),
1590         SOUNDCANVAS_PORT(0x0582, 0x0003, 3, "%s Part D", 128),
1591         EXTERNAL_PORT(0x0582, 0x0003, 4, "%s MIDI 1"),
1592         EXTERNAL_PORT(0x0582, 0x0003, 5, "%s MIDI 2"),
1593         /* Roland U-8 */
1594         EXTERNAL_PORT(0x0582, 0x0004, 0, "%s MIDI"),
1595         CONTROL_PORT(0x0582, 0x0004, 1, "%s Control"),
1596         /* Roland SC-8820 */
1597         SOUNDCANVAS_PORT(0x0582, 0x0007, 0, "%s Part A", 64),
1598         SOUNDCANVAS_PORT(0x0582, 0x0007, 1, "%s Part B", 64),
1599         EXTERNAL_PORT(0x0582, 0x0007, 2, "%s MIDI"),
1600         /* Roland SK-500 */
1601         SOUNDCANVAS_PORT(0x0582, 0x000b, 0, "%s Part A", 64),
1602         SOUNDCANVAS_PORT(0x0582, 0x000b, 1, "%s Part B", 64),
1603         EXTERNAL_PORT(0x0582, 0x000b, 2, "%s MIDI"),
1604         /* Roland SC-D70 */
1605         SOUNDCANVAS_PORT(0x0582, 0x000c, 0, "%s Part A", 64),
1606         SOUNDCANVAS_PORT(0x0582, 0x000c, 1, "%s Part B", 64),
1607         EXTERNAL_PORT(0x0582, 0x000c, 2, "%s MIDI"),
1608         /* Edirol UM-880 */
1609         CONTROL_PORT(0x0582, 0x0014, 8, "%s Control"),
1610         /* Edirol SD-90 */
1611         ROLAND_SYNTH_PORT(0x0582, 0x0016, 0, "%s Part A", 128),
1612         ROLAND_SYNTH_PORT(0x0582, 0x0016, 1, "%s Part B", 128),
1613         EXTERNAL_PORT(0x0582, 0x0016, 2, "%s MIDI 1"),
1614         EXTERNAL_PORT(0x0582, 0x0016, 3, "%s MIDI 2"),
1615         /* Edirol UM-550 */
1616         CONTROL_PORT(0x0582, 0x0023, 5, "%s Control"),
1617         /* Edirol SD-20 */
1618         ROLAND_SYNTH_PORT(0x0582, 0x0027, 0, "%s Part A", 64),
1619         ROLAND_SYNTH_PORT(0x0582, 0x0027, 1, "%s Part B", 64),
1620         EXTERNAL_PORT(0x0582, 0x0027, 2, "%s MIDI"),
1621         /* Edirol SD-80 */
1622         ROLAND_SYNTH_PORT(0x0582, 0x0029, 0, "%s Part A", 128),
1623         ROLAND_SYNTH_PORT(0x0582, 0x0029, 1, "%s Part B", 128),
1624         EXTERNAL_PORT(0x0582, 0x0029, 2, "%s MIDI 1"),
1625         EXTERNAL_PORT(0x0582, 0x0029, 3, "%s MIDI 2"),
1626         /* Edirol UA-700 */
1627         EXTERNAL_PORT(0x0582, 0x002b, 0, "%s MIDI"),
1628         CONTROL_PORT(0x0582, 0x002b, 1, "%s Control"),
1629         /* Roland VariOS */
1630         EXTERNAL_PORT(0x0582, 0x002f, 0, "%s MIDI"),
1631         EXTERNAL_PORT(0x0582, 0x002f, 1, "%s External MIDI"),
1632         EXTERNAL_PORT(0x0582, 0x002f, 2, "%s Sync"),
1633         /* Edirol PCR */
1634         EXTERNAL_PORT(0x0582, 0x0033, 0, "%s MIDI"),
1635         EXTERNAL_PORT(0x0582, 0x0033, 1, "%s 1"),
1636         EXTERNAL_PORT(0x0582, 0x0033, 2, "%s 2"),
1637         /* BOSS GS-10 */
1638         EXTERNAL_PORT(0x0582, 0x003b, 0, "%s MIDI"),
1639         CONTROL_PORT(0x0582, 0x003b, 1, "%s Control"),
1640         /* Edirol UA-1000 */
1641         EXTERNAL_PORT(0x0582, 0x0044, 0, "%s MIDI"),
1642         CONTROL_PORT(0x0582, 0x0044, 1, "%s Control"),
1643         /* Edirol UR-80 */
1644         EXTERNAL_PORT(0x0582, 0x0048, 0, "%s MIDI"),
1645         EXTERNAL_PORT(0x0582, 0x0048, 1, "%s 1"),
1646         EXTERNAL_PORT(0x0582, 0x0048, 2, "%s 2"),
1647         /* Edirol PCR-A */
1648         EXTERNAL_PORT(0x0582, 0x004d, 0, "%s MIDI"),
1649         EXTERNAL_PORT(0x0582, 0x004d, 1, "%s 1"),
1650         EXTERNAL_PORT(0x0582, 0x004d, 2, "%s 2"),
1651         /* BOSS GT-PRO */
1652         CONTROL_PORT(0x0582, 0x0089, 0, "%s Control"),
1653         /* Edirol UM-3EX */
1654         CONTROL_PORT(0x0582, 0x009a, 3, "%s Control"),
1655         /* Roland VG-99 */
1656         CONTROL_PORT(0x0582, 0x00b2, 0, "%s Control"),
1657         EXTERNAL_PORT(0x0582, 0x00b2, 1, "%s MIDI"),
1658         /* Cakewalk Sonar V-Studio 100 */
1659         EXTERNAL_PORT(0x0582, 0x00eb, 0, "%s MIDI"),
1660         CONTROL_PORT(0x0582, 0x00eb, 1, "%s Control"),
1661         /* Roland VB-99 */
1662         CONTROL_PORT(0x0582, 0x0102, 0, "%s Control"),
1663         EXTERNAL_PORT(0x0582, 0x0102, 1, "%s MIDI"),
1664         /* Roland A-PRO */
1665         EXTERNAL_PORT(0x0582, 0x010f, 0, "%s MIDI"),
1666         CONTROL_PORT(0x0582, 0x010f, 1, "%s 1"),
1667         CONTROL_PORT(0x0582, 0x010f, 2, "%s 2"),
1668         /* Roland SD-50 */
1669         ROLAND_SYNTH_PORT(0x0582, 0x0114, 0, "%s Synth", 128),
1670         EXTERNAL_PORT(0x0582, 0x0114, 1, "%s MIDI"),
1671         CONTROL_PORT(0x0582, 0x0114, 2, "%s Control"),
1672         /* Roland OCTA-CAPTURE */
1673         EXTERNAL_PORT(0x0582, 0x0120, 0, "%s MIDI"),
1674         CONTROL_PORT(0x0582, 0x0120, 1, "%s Control"),
1675         EXTERNAL_PORT(0x0582, 0x0121, 0, "%s MIDI"),
1676         CONTROL_PORT(0x0582, 0x0121, 1, "%s Control"),
1677         /* Roland SPD-SX */
1678         CONTROL_PORT(0x0582, 0x0145, 0, "%s Control"),
1679         EXTERNAL_PORT(0x0582, 0x0145, 1, "%s MIDI"),
1680         /* Roland A-Series */
1681         CONTROL_PORT(0x0582, 0x0156, 0, "%s Keyboard"),
1682         EXTERNAL_PORT(0x0582, 0x0156, 1, "%s MIDI"),
1683         /* Roland INTEGRA-7 */
1684         ROLAND_SYNTH_PORT(0x0582, 0x015b, 0, "%s Synth", 128),
1685         CONTROL_PORT(0x0582, 0x015b, 1, "%s Control"),
1686         /* M-Audio MidiSport 8x8 */
1687         CONTROL_PORT(0x0763, 0x1031, 8, "%s Control"),
1688         CONTROL_PORT(0x0763, 0x1033, 8, "%s Control"),
1689         /* MOTU Fastlane */
1690         EXTERNAL_PORT(0x07fd, 0x0001, 0, "%s MIDI A"),
1691         EXTERNAL_PORT(0x07fd, 0x0001, 1, "%s MIDI B"),
1692         /* Emagic Unitor8/AMT8/MT4 */
1693         EXTERNAL_PORT(0x086a, 0x0001, 8, "%s Broadcast"),
1694         EXTERNAL_PORT(0x086a, 0x0002, 8, "%s Broadcast"),
1695         EXTERNAL_PORT(0x086a, 0x0003, 4, "%s Broadcast"),
1696         /* Akai MPD16 */
1697         CONTROL_PORT(0x09e8, 0x0062, 0, "%s Control"),
1698         PORT_INFO(0x09e8, 0x0062, 1, "%s MIDI", 0,
1699                 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
1700                 SNDRV_SEQ_PORT_TYPE_HARDWARE),
1701         /* Access Music Virus TI */
1702         EXTERNAL_PORT(0x133e, 0x0815, 0, "%s MIDI"),
1703         PORT_INFO(0x133e, 0x0815, 1, "%s Synth", 0,
1704                 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
1705                 SNDRV_SEQ_PORT_TYPE_HARDWARE |
1706                 SNDRV_SEQ_PORT_TYPE_SYNTHESIZER),
1707 };
1708
1709 static struct port_info *find_port_info(struct snd_usb_midi *umidi, int number)
1710 {
1711         int i;
1712
1713         for (i = 0; i < ARRAY_SIZE(snd_usbmidi_port_info); ++i) {
1714                 if (snd_usbmidi_port_info[i].id == umidi->usb_id &&
1715                     snd_usbmidi_port_info[i].port == number)
1716                         return &snd_usbmidi_port_info[i];
1717         }
1718         return NULL;
1719 }
1720
1721 static void snd_usbmidi_get_port_info(struct snd_rawmidi *rmidi, int number,
1722                                       struct snd_seq_port_info *seq_port_info)
1723 {
1724         struct snd_usb_midi *umidi = rmidi->private_data;
1725         struct port_info *port_info;
1726
1727         /* TODO: read port flags from descriptors */
1728         port_info = find_port_info(umidi, number);
1729         if (port_info) {
1730                 seq_port_info->type = port_info->seq_flags;
1731                 seq_port_info->midi_voices = port_info->voices;
1732         }
1733 }
1734
1735 static void snd_usbmidi_init_substream(struct snd_usb_midi *umidi,
1736                                        int stream, int number,
1737                                        struct snd_rawmidi_substream **rsubstream)
1738 {
1739         struct port_info *port_info;
1740         const char *name_format;
1741
1742         struct snd_rawmidi_substream *substream =
1743                 snd_usbmidi_find_substream(umidi, stream, number);
1744         if (!substream) {
1745                 dev_err(&umidi->dev->dev, "substream %d:%d not found\n", stream,
1746                         number);
1747                 return;
1748         }
1749
1750         /* TODO: read port name from jack descriptor */
1751         port_info = find_port_info(umidi, number);
1752         name_format = port_info ? port_info->name : "%s MIDI %d";
1753         snprintf(substream->name, sizeof(substream->name),
1754                  name_format, umidi->card->shortname, number + 1);
1755
1756         *rsubstream = substream;
1757 }
1758
1759 /*
1760  * Creates the endpoints and their ports.
1761  */
1762 static int snd_usbmidi_create_endpoints(struct snd_usb_midi *umidi,
1763                                         struct snd_usb_midi_endpoint_info *endpoints)
1764 {
1765         int i, j, err;
1766         int out_ports = 0, in_ports = 0;
1767
1768         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1769                 if (endpoints[i].out_cables) {
1770                         err = snd_usbmidi_out_endpoint_create(umidi,
1771                                                               &endpoints[i],
1772                                                               &umidi->endpoints[i]);
1773                         if (err < 0)
1774                                 return err;
1775                 }
1776                 if (endpoints[i].in_cables) {
1777                         err = snd_usbmidi_in_endpoint_create(umidi,
1778                                                              &endpoints[i],
1779                                                              &umidi->endpoints[i]);
1780                         if (err < 0)
1781                                 return err;
1782                 }
1783
1784                 for (j = 0; j < 0x10; ++j) {
1785                         if (endpoints[i].out_cables & (1 << j)) {
1786                                 snd_usbmidi_init_substream(umidi,
1787                                                            SNDRV_RAWMIDI_STREAM_OUTPUT,
1788                                                            out_ports,
1789                                                            &umidi->endpoints[i].out->ports[j].substream);
1790                                 ++out_ports;
1791                         }
1792                         if (endpoints[i].in_cables & (1 << j)) {
1793                                 snd_usbmidi_init_substream(umidi,
1794                                                            SNDRV_RAWMIDI_STREAM_INPUT,
1795                                                            in_ports,
1796                                                            &umidi->endpoints[i].in->ports[j].substream);
1797                                 ++in_ports;
1798                         }
1799                 }
1800         }
1801         dev_dbg(&umidi->dev->dev, "created %d output and %d input ports\n",
1802                     out_ports, in_ports);
1803         return 0;
1804 }
1805
1806 /*
1807  * Returns MIDIStreaming device capabilities.
1808  */
1809 static int snd_usbmidi_get_ms_info(struct snd_usb_midi *umidi,
1810                                    struct snd_usb_midi_endpoint_info *endpoints)
1811 {
1812         struct usb_interface *intf;
1813         struct usb_host_interface *hostif;
1814         struct usb_interface_descriptor *intfd;
1815         struct usb_ms_header_descriptor *ms_header;
1816         struct usb_host_endpoint *hostep;
1817         struct usb_endpoint_descriptor *ep;
1818         struct usb_ms_endpoint_descriptor *ms_ep;
1819         int i, epidx;
1820
1821         intf = umidi->iface;
1822         if (!intf)
1823                 return -ENXIO;
1824         hostif = &intf->altsetting[0];
1825         intfd = get_iface_desc(hostif);
1826         ms_header = (struct usb_ms_header_descriptor *)hostif->extra;
1827         if (hostif->extralen >= 7 &&
1828             ms_header->bLength >= 7 &&
1829             ms_header->bDescriptorType == USB_DT_CS_INTERFACE &&
1830             ms_header->bDescriptorSubtype == UAC_HEADER)
1831                 dev_dbg(&umidi->dev->dev, "MIDIStreaming version %02x.%02x\n",
1832                             ms_header->bcdMSC[1], ms_header->bcdMSC[0]);
1833         else
1834                 dev_warn(&umidi->dev->dev,
1835                          "MIDIStreaming interface descriptor not found\n");
1836
1837         epidx = 0;
1838         for (i = 0; i < intfd->bNumEndpoints; ++i) {
1839                 hostep = &hostif->endpoint[i];
1840                 ep = get_ep_desc(hostep);
1841                 if (!usb_endpoint_xfer_bulk(ep) && !usb_endpoint_xfer_int(ep))
1842                         continue;
1843                 ms_ep = (struct usb_ms_endpoint_descriptor *)hostep->extra;
1844                 if (hostep->extralen < 4 ||
1845                     ms_ep->bLength < 4 ||
1846                     ms_ep->bDescriptorType != USB_DT_CS_ENDPOINT ||
1847                     ms_ep->bDescriptorSubtype != UAC_MS_GENERAL)
1848                         continue;
1849                 if (usb_endpoint_dir_out(ep)) {
1850                         if (endpoints[epidx].out_ep) {
1851                                 if (++epidx >= MIDI_MAX_ENDPOINTS) {
1852                                         dev_warn(&umidi->dev->dev,
1853                                                  "too many endpoints\n");
1854                                         break;
1855                                 }
1856                         }
1857                         endpoints[epidx].out_ep = usb_endpoint_num(ep);
1858                         if (usb_endpoint_xfer_int(ep))
1859                                 endpoints[epidx].out_interval = ep->bInterval;
1860                         else if (snd_usb_get_speed(umidi->dev) == USB_SPEED_LOW)
1861                                 /*
1862                                  * Low speed bulk transfers don't exist, so
1863                                  * force interrupt transfers for devices like
1864                                  * ESI MIDI Mate that try to use them anyway.
1865                                  */
1866                                 endpoints[epidx].out_interval = 1;
1867                         endpoints[epidx].out_cables =
1868                                 (1 << ms_ep->bNumEmbMIDIJack) - 1;
1869                         dev_dbg(&umidi->dev->dev, "EP %02X: %d jack(s)\n",
1870                                 ep->bEndpointAddress, ms_ep->bNumEmbMIDIJack);
1871                 } else {
1872                         if (endpoints[epidx].in_ep) {
1873                                 if (++epidx >= MIDI_MAX_ENDPOINTS) {
1874                                         dev_warn(&umidi->dev->dev,
1875                                                  "too many endpoints\n");
1876                                         break;
1877                                 }
1878                         }
1879                         endpoints[epidx].in_ep = usb_endpoint_num(ep);
1880                         if (usb_endpoint_xfer_int(ep))
1881                                 endpoints[epidx].in_interval = ep->bInterval;
1882                         else if (snd_usb_get_speed(umidi->dev) == USB_SPEED_LOW)
1883                                 endpoints[epidx].in_interval = 1;
1884                         endpoints[epidx].in_cables =
1885                                 (1 << ms_ep->bNumEmbMIDIJack) - 1;
1886                         dev_dbg(&umidi->dev->dev, "EP %02X: %d jack(s)\n",
1887                                 ep->bEndpointAddress, ms_ep->bNumEmbMIDIJack);
1888                 }
1889         }
1890         return 0;
1891 }
1892
1893 static int roland_load_info(struct snd_kcontrol *kcontrol,
1894                             struct snd_ctl_elem_info *info)
1895 {
1896         static const char *const names[] = { "High Load", "Light Load" };
1897
1898         return snd_ctl_enum_info(info, 1, 2, names);
1899 }
1900
1901 static int roland_load_get(struct snd_kcontrol *kcontrol,
1902                            struct snd_ctl_elem_value *value)
1903 {
1904         value->value.enumerated.item[0] = kcontrol->private_value;
1905         return 0;
1906 }
1907
1908 static int roland_load_put(struct snd_kcontrol *kcontrol,
1909                            struct snd_ctl_elem_value *value)
1910 {
1911         struct snd_usb_midi *umidi = kcontrol->private_data;
1912         int changed;
1913
1914         if (value->value.enumerated.item[0] > 1)
1915                 return -EINVAL;
1916         mutex_lock(&umidi->mutex);
1917         changed = value->value.enumerated.item[0] != kcontrol->private_value;
1918         if (changed)
1919                 kcontrol->private_value = value->value.enumerated.item[0];
1920         mutex_unlock(&umidi->mutex);
1921         return changed;
1922 }
1923
1924 static struct snd_kcontrol_new roland_load_ctl = {
1925         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1926         .name = "MIDI Input Mode",
1927         .info = roland_load_info,
1928         .get = roland_load_get,
1929         .put = roland_load_put,
1930         .private_value = 1,
1931 };
1932
1933 /*
1934  * On Roland devices, use the second alternate setting to be able to use
1935  * the interrupt input endpoint.
1936  */
1937 static void snd_usbmidi_switch_roland_altsetting(struct snd_usb_midi *umidi)
1938 {
1939         struct usb_interface *intf;
1940         struct usb_host_interface *hostif;
1941         struct usb_interface_descriptor *intfd;
1942
1943         intf = umidi->iface;
1944         if (!intf || intf->num_altsetting != 2)
1945                 return;
1946
1947         hostif = &intf->altsetting[1];
1948         intfd = get_iface_desc(hostif);
1949        /* If either or both of the endpoints support interrupt transfer,
1950         * then use the alternate setting
1951         */
1952         if (intfd->bNumEndpoints != 2 ||
1953             !((get_endpoint(hostif, 0)->bmAttributes &
1954                USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT ||
1955               (get_endpoint(hostif, 1)->bmAttributes &
1956                USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT))
1957                 return;
1958
1959         dev_dbg(&umidi->dev->dev, "switching to altsetting %d with int ep\n",
1960                     intfd->bAlternateSetting);
1961         usb_set_interface(umidi->dev, intfd->bInterfaceNumber,
1962                           intfd->bAlternateSetting);
1963
1964         umidi->roland_load_ctl = snd_ctl_new1(&roland_load_ctl, umidi);
1965         if (snd_ctl_add(umidi->card, umidi->roland_load_ctl) < 0)
1966                 umidi->roland_load_ctl = NULL;
1967 }
1968
1969 /*
1970  * Try to find any usable endpoints in the interface.
1971  */
1972 static int snd_usbmidi_detect_endpoints(struct snd_usb_midi *umidi,
1973                                         struct snd_usb_midi_endpoint_info *endpoint,
1974                                         int max_endpoints)
1975 {
1976         struct usb_interface *intf;
1977         struct usb_host_interface *hostif;
1978         struct usb_interface_descriptor *intfd;
1979         struct usb_endpoint_descriptor *epd;
1980         int i, out_eps = 0, in_eps = 0;
1981
1982         if (USB_ID_VENDOR(umidi->usb_id) == 0x0582)
1983                 snd_usbmidi_switch_roland_altsetting(umidi);
1984
1985         if (endpoint[0].out_ep || endpoint[0].in_ep)
1986                 return 0;
1987
1988         intf = umidi->iface;
1989         if (!intf || intf->num_altsetting < 1)
1990                 return -ENOENT;
1991         hostif = intf->cur_altsetting;
1992         intfd = get_iface_desc(hostif);
1993
1994         for (i = 0; i < intfd->bNumEndpoints; ++i) {
1995                 epd = get_endpoint(hostif, i);
1996                 if (!usb_endpoint_xfer_bulk(epd) &&
1997                     !usb_endpoint_xfer_int(epd))
1998                         continue;
1999                 if (out_eps < max_endpoints &&
2000                     usb_endpoint_dir_out(epd)) {
2001                         endpoint[out_eps].out_ep = usb_endpoint_num(epd);
2002                         if (usb_endpoint_xfer_int(epd))
2003                                 endpoint[out_eps].out_interval = epd->bInterval;
2004                         ++out_eps;
2005                 }
2006                 if (in_eps < max_endpoints &&
2007                     usb_endpoint_dir_in(epd)) {
2008                         endpoint[in_eps].in_ep = usb_endpoint_num(epd);
2009                         if (usb_endpoint_xfer_int(epd))
2010                                 endpoint[in_eps].in_interval = epd->bInterval;
2011                         ++in_eps;
2012                 }
2013         }
2014         return (out_eps || in_eps) ? 0 : -ENOENT;
2015 }
2016
2017 /*
2018  * Detects the endpoints for one-port-per-endpoint protocols.
2019  */
2020 static int snd_usbmidi_detect_per_port_endpoints(struct snd_usb_midi *umidi,
2021                                                  struct snd_usb_midi_endpoint_info *endpoints)
2022 {
2023         int err, i;
2024
2025         err = snd_usbmidi_detect_endpoints(umidi, endpoints, MIDI_MAX_ENDPOINTS);
2026         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
2027                 if (endpoints[i].out_ep)
2028                         endpoints[i].out_cables = 0x0001;
2029                 if (endpoints[i].in_ep)
2030                         endpoints[i].in_cables = 0x0001;
2031         }
2032         return err;
2033 }
2034
2035 /*
2036  * Detects the endpoints and ports of Yamaha devices.
2037  */
2038 static int snd_usbmidi_detect_yamaha(struct snd_usb_midi *umidi,
2039                                      struct snd_usb_midi_endpoint_info *endpoint)
2040 {
2041         struct usb_interface *intf;
2042         struct usb_host_interface *hostif;
2043         struct usb_interface_descriptor *intfd;
2044         uint8_t *cs_desc;
2045
2046         intf = umidi->iface;
2047         if (!intf)
2048                 return -ENOENT;
2049         hostif = intf->altsetting;
2050         intfd = get_iface_desc(hostif);
2051         if (intfd->bNumEndpoints < 1)
2052                 return -ENOENT;
2053
2054         /*
2055          * For each port there is one MIDI_IN/OUT_JACK descriptor, not
2056          * necessarily with any useful contents.  So simply count 'em.
2057          */
2058         for (cs_desc = hostif->extra;
2059              cs_desc < hostif->extra + hostif->extralen && cs_desc[0] >= 2;
2060              cs_desc += cs_desc[0]) {
2061                 if (cs_desc[1] == USB_DT_CS_INTERFACE) {
2062                         if (cs_desc[2] == UAC_MIDI_IN_JACK)
2063                                 endpoint->in_cables =
2064                                         (endpoint->in_cables << 1) | 1;
2065                         else if (cs_desc[2] == UAC_MIDI_OUT_JACK)
2066                                 endpoint->out_cables =
2067                                         (endpoint->out_cables << 1) | 1;
2068                 }
2069         }
2070         if (!endpoint->in_cables && !endpoint->out_cables)
2071                 return -ENOENT;
2072
2073         return snd_usbmidi_detect_endpoints(umidi, endpoint, 1);
2074 }
2075
2076 /*
2077  * Detects the endpoints and ports of Roland devices.
2078  */
2079 static int snd_usbmidi_detect_roland(struct snd_usb_midi *umidi,
2080                                      struct snd_usb_midi_endpoint_info *endpoint)
2081 {
2082         struct usb_interface *intf;
2083         struct usb_host_interface *hostif;
2084         u8 *cs_desc;
2085
2086         intf = umidi->iface;
2087         if (!intf)
2088                 return -ENOENT;
2089         hostif = intf->altsetting;
2090         /*
2091          * Some devices have a descriptor <06 24 F1 02 <inputs> <outputs>>,
2092          * some have standard class descriptors, or both kinds, or neither.
2093          */
2094         for (cs_desc = hostif->extra;
2095              cs_desc < hostif->extra + hostif->extralen && cs_desc[0] >= 2;
2096              cs_desc += cs_desc[0]) {
2097                 if (cs_desc[0] >= 6 &&
2098                     cs_desc[1] == USB_DT_CS_INTERFACE &&
2099                     cs_desc[2] == 0xf1 &&
2100                     cs_desc[3] == 0x02) {
2101                         endpoint->in_cables  = (1 << cs_desc[4]) - 1;
2102                         endpoint->out_cables = (1 << cs_desc[5]) - 1;
2103                         return snd_usbmidi_detect_endpoints(umidi, endpoint, 1);
2104                 } else if (cs_desc[0] >= 7 &&
2105                            cs_desc[1] == USB_DT_CS_INTERFACE &&
2106                            cs_desc[2] == UAC_HEADER) {
2107                         return snd_usbmidi_get_ms_info(umidi, endpoint);
2108                 }
2109         }
2110
2111         return -ENODEV;
2112 }
2113
2114 /*
2115  * Creates the endpoints and their ports for Midiman devices.
2116  */
2117 static int snd_usbmidi_create_endpoints_midiman(struct snd_usb_midi *umidi,
2118                                                 struct snd_usb_midi_endpoint_info *endpoint)
2119 {
2120         struct snd_usb_midi_endpoint_info ep_info;
2121         struct usb_interface *intf;
2122         struct usb_host_interface *hostif;
2123         struct usb_interface_descriptor *intfd;
2124         struct usb_endpoint_descriptor *epd;
2125         int cable, err;
2126
2127         intf = umidi->iface;
2128         if (!intf)
2129                 return -ENOENT;
2130         hostif = intf->altsetting;
2131         intfd = get_iface_desc(hostif);
2132         /*
2133          * The various MidiSport devices have more or less random endpoint
2134          * numbers, so we have to identify the endpoints by their index in
2135          * the descriptor array, like the driver for that other OS does.
2136          *
2137          * There is one interrupt input endpoint for all input ports, one
2138          * bulk output endpoint for even-numbered ports, and one for odd-
2139          * numbered ports.  Both bulk output endpoints have corresponding
2140          * input bulk endpoints (at indices 1 and 3) which aren't used.
2141          */
2142         if (intfd->bNumEndpoints < (endpoint->out_cables > 0x0001 ? 5 : 3)) {
2143                 dev_dbg(&umidi->dev->dev, "not enough endpoints\n");
2144                 return -ENOENT;
2145         }
2146
2147         epd = get_endpoint(hostif, 0);
2148         if (!usb_endpoint_dir_in(epd) || !usb_endpoint_xfer_int(epd)) {
2149                 dev_dbg(&umidi->dev->dev, "endpoint[0] isn't interrupt\n");
2150                 return -ENXIO;
2151         }
2152         epd = get_endpoint(hostif, 2);
2153         if (!usb_endpoint_dir_out(epd) || !usb_endpoint_xfer_bulk(epd)) {
2154                 dev_dbg(&umidi->dev->dev, "endpoint[2] isn't bulk output\n");
2155                 return -ENXIO;
2156         }
2157         if (endpoint->out_cables > 0x0001) {
2158                 epd = get_endpoint(hostif, 4);
2159                 if (!usb_endpoint_dir_out(epd) ||
2160                     !usb_endpoint_xfer_bulk(epd)) {
2161                         dev_dbg(&umidi->dev->dev,
2162                                 "endpoint[4] isn't bulk output\n");
2163                         return -ENXIO;
2164                 }
2165         }
2166
2167         ep_info.out_ep = get_endpoint(hostif, 2)->bEndpointAddress &
2168                 USB_ENDPOINT_NUMBER_MASK;
2169         ep_info.out_interval = 0;
2170         ep_info.out_cables = endpoint->out_cables & 0x5555;
2171         err = snd_usbmidi_out_endpoint_create(umidi, &ep_info,
2172                                               &umidi->endpoints[0]);
2173         if (err < 0)
2174                 return err;
2175
2176         ep_info.in_ep = get_endpoint(hostif, 0)->bEndpointAddress &
2177                 USB_ENDPOINT_NUMBER_MASK;
2178         ep_info.in_interval = get_endpoint(hostif, 0)->bInterval;
2179         ep_info.in_cables = endpoint->in_cables;
2180         err = snd_usbmidi_in_endpoint_create(umidi, &ep_info,
2181                                              &umidi->endpoints[0]);
2182         if (err < 0)
2183                 return err;
2184
2185         if (endpoint->out_cables > 0x0001) {
2186                 ep_info.out_ep = get_endpoint(hostif, 4)->bEndpointAddress &
2187                         USB_ENDPOINT_NUMBER_MASK;
2188                 ep_info.out_cables = endpoint->out_cables & 0xaaaa;
2189                 err = snd_usbmidi_out_endpoint_create(umidi, &ep_info,
2190                                                       &umidi->endpoints[1]);
2191                 if (err < 0)
2192                         return err;
2193         }
2194
2195         for (cable = 0; cable < 0x10; ++cable) {
2196                 if (endpoint->out_cables & (1 << cable))
2197                         snd_usbmidi_init_substream(umidi,
2198                                                    SNDRV_RAWMIDI_STREAM_OUTPUT,
2199                                                    cable,
2200                                                    &umidi->endpoints[cable & 1].out->ports[cable].substream);
2201                 if (endpoint->in_cables & (1 << cable))
2202                         snd_usbmidi_init_substream(umidi,
2203                                                    SNDRV_RAWMIDI_STREAM_INPUT,
2204                                                    cable,
2205                                                    &umidi->endpoints[0].in->ports[cable].substream);
2206         }
2207         return 0;
2208 }
2209
2210 static const struct snd_rawmidi_global_ops snd_usbmidi_ops = {
2211         .get_port_info = snd_usbmidi_get_port_info,
2212 };
2213
2214 static int snd_usbmidi_create_rawmidi(struct snd_usb_midi *umidi,
2215                                       int out_ports, int in_ports)
2216 {
2217         struct snd_rawmidi *rmidi;
2218         int err;
2219
2220         err = snd_rawmidi_new(umidi->card, "USB MIDI",
2221                               umidi->next_midi_device++,
2222                               out_ports, in_ports, &rmidi);
2223         if (err < 0)
2224                 return err;
2225         strcpy(rmidi->name, umidi->card->shortname);
2226         rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
2227                             SNDRV_RAWMIDI_INFO_INPUT |
2228                             SNDRV_RAWMIDI_INFO_DUPLEX;
2229         rmidi->ops = &snd_usbmidi_ops;
2230         rmidi->private_data = umidi;
2231         rmidi->private_free = snd_usbmidi_rawmidi_free;
2232         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
2233                             &snd_usbmidi_output_ops);
2234         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
2235                             &snd_usbmidi_input_ops);
2236
2237         umidi->rmidi = rmidi;
2238         return 0;
2239 }
2240
2241 /*
2242  * Temporarily stop input.
2243  */
2244 void snd_usbmidi_input_stop(struct list_head *p)
2245 {
2246         struct snd_usb_midi *umidi;
2247         unsigned int i, j;
2248
2249         umidi = list_entry(p, struct snd_usb_midi, list);
2250         if (!umidi->input_running)
2251                 return;
2252         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
2253                 struct snd_usb_midi_endpoint *ep = &umidi->endpoints[i];
2254                 if (ep->in)
2255                         for (j = 0; j < INPUT_URBS; ++j)
2256                                 usb_kill_urb(ep->in->urbs[j]);
2257         }
2258         umidi->input_running = 0;
2259 }
2260 EXPORT_SYMBOL(snd_usbmidi_input_stop);
2261
2262 static void snd_usbmidi_input_start_ep(struct snd_usb_midi_in_endpoint *ep)
2263 {
2264         unsigned int i;
2265
2266         if (!ep)
2267                 return;
2268         for (i = 0; i < INPUT_URBS; ++i) {
2269                 struct urb *urb = ep->urbs[i];
2270                 urb->dev = ep->umidi->dev;
2271                 snd_usbmidi_submit_urb(urb, GFP_KERNEL);
2272         }
2273 }
2274
2275 /*
2276  * Resume input after a call to snd_usbmidi_input_stop().
2277  */
2278 void snd_usbmidi_input_start(struct list_head *p)
2279 {
2280         struct snd_usb_midi *umidi;
2281         int i;
2282
2283         umidi = list_entry(p, struct snd_usb_midi, list);
2284         if (umidi->input_running || !umidi->opened[1])
2285                 return;
2286         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
2287                 snd_usbmidi_input_start_ep(umidi->endpoints[i].in);
2288         umidi->input_running = 1;
2289 }
2290 EXPORT_SYMBOL(snd_usbmidi_input_start);
2291
2292 /*
2293  * Prepare for suspend. Typically called from the USB suspend callback.
2294  */
2295 void snd_usbmidi_suspend(struct list_head *p)
2296 {
2297         struct snd_usb_midi *umidi;
2298
2299         umidi = list_entry(p, struct snd_usb_midi, list);
2300         mutex_lock(&umidi->mutex);
2301         snd_usbmidi_input_stop(p);
2302         mutex_unlock(&umidi->mutex);
2303 }
2304 EXPORT_SYMBOL(snd_usbmidi_suspend);
2305
2306 /*
2307  * Resume. Typically called from the USB resume callback.
2308  */
2309 void snd_usbmidi_resume(struct list_head *p)
2310 {
2311         struct snd_usb_midi *umidi;
2312
2313         umidi = list_entry(p, struct snd_usb_midi, list);
2314         mutex_lock(&umidi->mutex);
2315         snd_usbmidi_input_start(p);
2316         mutex_unlock(&umidi->mutex);
2317 }
2318 EXPORT_SYMBOL(snd_usbmidi_resume);
2319
2320 /*
2321  * Creates and registers everything needed for a MIDI streaming interface.
2322  */
2323 int __snd_usbmidi_create(struct snd_card *card,
2324                          struct usb_interface *iface,
2325                          struct list_head *midi_list,
2326                          const struct snd_usb_audio_quirk *quirk,
2327                          unsigned int usb_id)
2328 {
2329         struct snd_usb_midi *umidi;
2330         struct snd_usb_midi_endpoint_info endpoints[MIDI_MAX_ENDPOINTS];
2331         int out_ports, in_ports;
2332         int i, err;
2333
2334         umidi = kzalloc(sizeof(*umidi), GFP_KERNEL);
2335         if (!umidi)
2336                 return -ENOMEM;
2337         umidi->dev = interface_to_usbdev(iface);
2338         umidi->card = card;
2339         umidi->iface = iface;
2340         umidi->quirk = quirk;
2341         umidi->usb_protocol_ops = &snd_usbmidi_standard_ops;
2342         spin_lock_init(&umidi->disc_lock);
2343         init_rwsem(&umidi->disc_rwsem);
2344         mutex_init(&umidi->mutex);
2345         if (!usb_id)
2346                 usb_id = USB_ID(le16_to_cpu(umidi->dev->descriptor.idVendor),
2347                                le16_to_cpu(umidi->dev->descriptor.idProduct));
2348         umidi->usb_id = usb_id;
2349         setup_timer(&umidi->error_timer, snd_usbmidi_error_timer,
2350                     (unsigned long)umidi);
2351
2352         /* detect the endpoint(s) to use */
2353         memset(endpoints, 0, sizeof(endpoints));
2354         switch (quirk ? quirk->type : QUIRK_MIDI_STANDARD_INTERFACE) {
2355         case QUIRK_MIDI_STANDARD_INTERFACE:
2356                 err = snd_usbmidi_get_ms_info(umidi, endpoints);
2357                 if (umidi->usb_id == USB_ID(0x0763, 0x0150)) /* M-Audio Uno */
2358                         umidi->usb_protocol_ops =
2359                                 &snd_usbmidi_maudio_broken_running_status_ops;
2360                 break;
2361         case QUIRK_MIDI_US122L:
2362                 umidi->usb_protocol_ops = &snd_usbmidi_122l_ops;
2363                 /* fall through */
2364         case QUIRK_MIDI_FIXED_ENDPOINT:
2365                 memcpy(&endpoints[0], quirk->data,
2366                        sizeof(struct snd_usb_midi_endpoint_info));
2367                 err = snd_usbmidi_detect_endpoints(umidi, &endpoints[0], 1);
2368                 break;
2369         case QUIRK_MIDI_YAMAHA:
2370                 err = snd_usbmidi_detect_yamaha(umidi, &endpoints[0]);
2371                 break;
2372         case QUIRK_MIDI_ROLAND:
2373                 err = snd_usbmidi_detect_roland(umidi, &endpoints[0]);
2374                 break;
2375         case QUIRK_MIDI_MIDIMAN:
2376                 umidi->usb_protocol_ops = &snd_usbmidi_midiman_ops;
2377                 memcpy(&endpoints[0], quirk->data,
2378                        sizeof(struct snd_usb_midi_endpoint_info));
2379                 err = 0;
2380                 break;
2381         case QUIRK_MIDI_NOVATION:
2382                 umidi->usb_protocol_ops = &snd_usbmidi_novation_ops;
2383                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2384                 break;
2385         case QUIRK_MIDI_RAW_BYTES:
2386                 umidi->usb_protocol_ops = &snd_usbmidi_raw_ops;
2387                 /*
2388                  * Interface 1 contains isochronous endpoints, but with the same
2389                  * numbers as in interface 0.  Since it is interface 1 that the
2390                  * USB core has most recently seen, these descriptors are now
2391                  * associated with the endpoint numbers.  This will foul up our
2392                  * attempts to submit bulk/interrupt URBs to the endpoints in
2393                  * interface 0, so we have to make sure that the USB core looks
2394                  * again at interface 0 by calling usb_set_interface() on it.
2395                  */
2396                 if (umidi->usb_id == USB_ID(0x07fd, 0x0001)) /* MOTU Fastlane */
2397                         usb_set_interface(umidi->dev, 0, 0);
2398                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2399                 break;
2400         case QUIRK_MIDI_EMAGIC:
2401                 umidi->usb_protocol_ops = &snd_usbmidi_emagic_ops;
2402                 memcpy(&endpoints[0], quirk->data,
2403                        sizeof(struct snd_usb_midi_endpoint_info));
2404                 err = snd_usbmidi_detect_endpoints(umidi, &endpoints[0], 1);
2405                 break;
2406         case QUIRK_MIDI_CME:
2407                 umidi->usb_protocol_ops = &snd_usbmidi_cme_ops;
2408                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2409                 break;
2410         case QUIRK_MIDI_AKAI:
2411                 umidi->usb_protocol_ops = &snd_usbmidi_akai_ops;
2412                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2413                 /* endpoint 1 is input-only */
2414                 endpoints[1].out_cables = 0;
2415                 break;
2416         case QUIRK_MIDI_FTDI:
2417                 umidi->usb_protocol_ops = &snd_usbmidi_ftdi_ops;
2418
2419                 /* set baud rate to 31250 (48 MHz / 16 / 96) */
2420                 err = usb_control_msg(umidi->dev, usb_sndctrlpipe(umidi->dev, 0),
2421                                       3, 0x40, 0x60, 0, NULL, 0, 1000);
2422                 if (err < 0)
2423                         break;
2424
2425                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2426                 break;
2427         case QUIRK_MIDI_CH345:
2428                 umidi->usb_protocol_ops = &snd_usbmidi_ch345_broken_sysex_ops;
2429                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2430                 break;
2431         default:
2432                 dev_err(&umidi->dev->dev, "invalid quirk type %d\n",
2433                         quirk->type);
2434                 err = -ENXIO;
2435                 break;
2436         }
2437         if (err < 0) {
2438                 kfree(umidi);
2439                 return err;
2440         }
2441
2442         /* create rawmidi device */
2443         out_ports = 0;
2444         in_ports = 0;
2445         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
2446                 out_ports += hweight16(endpoints[i].out_cables);
2447                 in_ports += hweight16(endpoints[i].in_cables);
2448         }
2449         err = snd_usbmidi_create_rawmidi(umidi, out_ports, in_ports);
2450         if (err < 0) {
2451                 kfree(umidi);
2452                 return err;
2453         }
2454
2455         /* create endpoint/port structures */
2456         if (quirk && quirk->type == QUIRK_MIDI_MIDIMAN)
2457                 err = snd_usbmidi_create_endpoints_midiman(umidi, &endpoints[0]);
2458         else
2459                 err = snd_usbmidi_create_endpoints(umidi, endpoints);
2460         if (err < 0) {
2461                 return err;
2462         }
2463
2464         usb_autopm_get_interface_no_resume(umidi->iface);
2465
2466         list_add_tail(&umidi->list, midi_list);
2467         return 0;
2468 }
2469 EXPORT_SYMBOL(__snd_usbmidi_create);