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