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Linux/sound/usb/midi.c

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  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 <clemens@ladisch.de>");
 77 MODULE_DESCRIPTION("USB Audio/MIDI helper module");
 78 MODULE_LICENSE("Dual BSD/GPL");
 79 
 80 
 81 struct usb_ms_header_descriptor {
 82         __u8  bLength;
 83         __u8  bDescriptorType;
 84         __u8  bDescriptorSubtype;
 85         __u8  bcdMSC[2];
 86         __le16 wTotalLength;
 87 } __attribute__ ((packed));
 88 
 89 struct usb_ms_endpoint_descriptor {
 90         __u8  bLength;
 91         __u8  bDescriptorType;
 92         __u8  bDescriptorSubtype;
 93         __u8  bNumEmbMIDIJack;
 94         __u8  baAssocJackID[0];
 95 } __attribute__ ((packed));
 96 
 97 struct snd_usb_midi_in_endpoint;
 98 struct snd_usb_midi_out_endpoint;
 99 struct snd_usb_midi_endpoint;
100 
101 struct usb_protocol_ops {
102         void (*input)(struct snd_usb_midi_in_endpoint*, uint8_t*, int);
103         void (*output)(struct snd_usb_midi_out_endpoint *ep, struct urb *urb);
104         void (*output_packet)(struct urb*, uint8_t, uint8_t, uint8_t, uint8_t);
105         void (*init_out_endpoint)(struct snd_usb_midi_out_endpoint *);
106         void (*finish_out_endpoint)(struct snd_usb_midi_out_endpoint *);
107 };
108 
109 struct snd_usb_midi {
110         struct usb_device *dev;
111         struct snd_card *card;
112         struct usb_interface *iface;
113         const struct snd_usb_audio_quirk *quirk;
114         struct snd_rawmidi *rmidi;
115         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         case USB_SPEED_SUPER_PLUS:
915                 count = 1;
916                 break;
917         default:
918                 count = 2;
919         }
920         count = snd_rawmidi_transmit(ep->ports[0].substream,
921                                      urb->transfer_buffer,
922                                      count);
923         if (count < 1) {
924                 ep->ports[0].active = 0;
925                 return;
926         }
927 
928         memset(urb->transfer_buffer + count, 0xFD, ep->max_transfer - count);
929         urb->transfer_buffer_length = ep->max_transfer;
930 }
931 
932 static const struct usb_protocol_ops snd_usbmidi_122l_ops = {
933         .input = snd_usbmidi_us122l_input,
934         .output = snd_usbmidi_us122l_output,
935 };
936 
937 /*
938  * Emagic USB MIDI protocol: raw MIDI with "F5 xx" port switching.
939  */
940 
941 static void snd_usbmidi_emagic_init_out(struct snd_usb_midi_out_endpoint *ep)
942 {
943         static const u8 init_data[] = {
944                 /* initialization magic: "get version" */
945                 0xf0,
946                 0x00, 0x20, 0x31,       /* Emagic */
947                 0x64,                   /* Unitor8 */
948                 0x0b,                   /* version number request */
949                 0x00,                   /* command version */
950                 0x00,                   /* EEPROM, box 0 */
951                 0xf7
952         };
953         send_bulk_static_data(ep, init_data, sizeof(init_data));
954         /* while we're at it, pour on more magic */
955         send_bulk_static_data(ep, init_data, sizeof(init_data));
956 }
957 
958 static void snd_usbmidi_emagic_finish_out(struct snd_usb_midi_out_endpoint *ep)
959 {
960         static const u8 finish_data[] = {
961                 /* switch to patch mode with last preset */
962                 0xf0,
963                 0x00, 0x20, 0x31,       /* Emagic */
964                 0x64,                   /* Unitor8 */
965                 0x10,                   /* patch switch command */
966                 0x00,                   /* command version */
967                 0x7f,                   /* to all boxes */
968                 0x40,                   /* last preset in EEPROM */
969                 0xf7
970         };
971         send_bulk_static_data(ep, finish_data, sizeof(finish_data));
972 }
973 
974 static void snd_usbmidi_emagic_input(struct snd_usb_midi_in_endpoint *ep,
975                                      uint8_t *buffer, int buffer_length)
976 {
977         int i;
978 
979         /* FF indicates end of valid data */
980         for (i = 0; i < buffer_length; ++i)
981                 if (buffer[i] == 0xff) {
982                         buffer_length = i;
983                         break;
984                 }
985 
986         /* handle F5 at end of last buffer */
987         if (ep->seen_f5)
988                 goto switch_port;
989 
990         while (buffer_length > 0) {
991                 /* determine size of data until next F5 */
992                 for (i = 0; i < buffer_length; ++i)
993                         if (buffer[i] == 0xf5)
994                                 break;
995                 snd_usbmidi_input_data(ep, ep->current_port, buffer, i);
996                 buffer += i;
997                 buffer_length -= i;
998 
999                 if (buffer_length <= 0)
1000                         break;
1001                 /* assert(buffer[0] == 0xf5); */
1002                 ep->seen_f5 = 1;
1003                 ++buffer;
1004                 --buffer_length;
1005 
1006         switch_port:
1007                 if (buffer_length <= 0)
1008                         break;
1009                 if (buffer[0] < 0x80) {
1010                         ep->current_port = (buffer[0] - 1) & 15;
1011                         ++buffer;
1012                         --buffer_length;
1013                 }
1014                 ep->seen_f5 = 0;
1015         }
1016 }
1017 
1018 static void snd_usbmidi_emagic_output(struct snd_usb_midi_out_endpoint *ep,
1019                                       struct urb *urb)
1020 {
1021         int port0 = ep->current_port;
1022         uint8_t *buf = urb->transfer_buffer;
1023         int buf_free = ep->max_transfer;
1024         int length, i;
1025 
1026         for (i = 0; i < 0x10; ++i) {
1027                 /* round-robin, starting at the last current port */
1028                 int portnum = (port0 + i) & 15;
1029                 struct usbmidi_out_port *port = &ep->ports[portnum];
1030 
1031                 if (!port->active)
1032                         continue;
1033                 if (snd_rawmidi_transmit_peek(port->substream, buf, 1) != 1) {
1034                         port->active = 0;
1035                         continue;
1036                 }
1037 
1038                 if (portnum != ep->current_port) {
1039                         if (buf_free < 2)
1040                                 break;
1041                         ep->current_port = portnum;
1042                         buf[0] = 0xf5;
1043                         buf[1] = (portnum + 1) & 15;
1044                         buf += 2;
1045                         buf_free -= 2;
1046                 }
1047 
1048                 if (buf_free < 1)
1049                         break;
1050                 length = snd_rawmidi_transmit(port->substream, buf, buf_free);
1051                 if (length > 0) {
1052                         buf += length;
1053                         buf_free -= length;
1054                         if (buf_free < 1)
1055                                 break;
1056                 }
1057         }
1058         if (buf_free < ep->max_transfer && buf_free > 0) {
1059                 *buf = 0xff;
1060                 --buf_free;
1061         }
1062         urb->transfer_buffer_length = ep->max_transfer - buf_free;
1063 }
1064 
1065 static const struct usb_protocol_ops snd_usbmidi_emagic_ops = {
1066         .input = snd_usbmidi_emagic_input,
1067         .output = snd_usbmidi_emagic_output,
1068         .init_out_endpoint = snd_usbmidi_emagic_init_out,
1069         .finish_out_endpoint = snd_usbmidi_emagic_finish_out,
1070 };
1071 
1072 
1073 static void update_roland_altsetting(struct snd_usb_midi *umidi)
1074 {
1075         struct usb_interface *intf;
1076         struct usb_host_interface *hostif;
1077         struct usb_interface_descriptor *intfd;
1078         int is_light_load;
1079 
1080         intf = umidi->iface;
1081         is_light_load = intf->cur_altsetting != intf->altsetting;
1082         if (umidi->roland_load_ctl->private_value == is_light_load)
1083                 return;
1084         hostif = &intf->altsetting[umidi->roland_load_ctl->private_value];
1085         intfd = get_iface_desc(hostif);
1086         snd_usbmidi_input_stop(&umidi->list);
1087         usb_set_interface(umidi->dev, intfd->bInterfaceNumber,
1088                           intfd->bAlternateSetting);
1089         snd_usbmidi_input_start(&umidi->list);
1090 }
1091 
1092 static int substream_open(struct snd_rawmidi_substream *substream, int dir,
1093                           int open)
1094 {
1095         struct snd_usb_midi *umidi = substream->rmidi->private_data;
1096         struct snd_kcontrol *ctl;
1097 
1098         down_read(&umidi->disc_rwsem);
1099         if (umidi->disconnected) {
1100                 up_read(&umidi->disc_rwsem);
1101                 return open ? -ENODEV : 0;
1102         }
1103 
1104         mutex_lock(&umidi->mutex);
1105         if (open) {
1106                 if (!umidi->opened[0] && !umidi->opened[1]) {
1107                         if (umidi->roland_load_ctl) {
1108                                 ctl = umidi->roland_load_ctl;
1109                                 ctl->vd[0].access |=
1110                                         SNDRV_CTL_ELEM_ACCESS_INACTIVE;
1111                                 snd_ctl_notify(umidi->card,
1112                                        SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
1113                                 update_roland_altsetting(umidi);
1114                         }
1115                 }
1116                 umidi->opened[dir]++;
1117                 if (umidi->opened[1])
1118                         snd_usbmidi_input_start(&umidi->list);
1119         } else {
1120                 umidi->opened[dir]--;
1121                 if (!umidi->opened[1])
1122                         snd_usbmidi_input_stop(&umidi->list);
1123                 if (!umidi->opened[0] && !umidi->opened[1]) {
1124                         if (umidi->roland_load_ctl) {
1125                                 ctl = umidi->roland_load_ctl;
1126                                 ctl->vd[0].access &=
1127                                         ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
1128                                 snd_ctl_notify(umidi->card,
1129                                        SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
1130                         }
1131                 }
1132         }
1133         mutex_unlock(&umidi->mutex);
1134         up_read(&umidi->disc_rwsem);
1135         return 0;
1136 }
1137 
1138 static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
1139 {
1140         struct snd_usb_midi *umidi = substream->rmidi->private_data;
1141         struct usbmidi_out_port *port = NULL;
1142         int i, j;
1143 
1144         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
1145                 if (umidi->endpoints[i].out)
1146                         for (j = 0; j < 0x10; ++j)
1147                                 if (umidi->endpoints[i].out->ports[j].substream == substream) {
1148                                         port = &umidi->endpoints[i].out->ports[j];
1149                                         break;
1150                                 }
1151         if (!port) {
1152                 snd_BUG();
1153                 return -ENXIO;
1154         }
1155 
1156         substream->runtime->private_data = port;
1157         port->state = STATE_UNKNOWN;
1158         return substream_open(substream, 0, 1);
1159 }
1160 
1161 static int snd_usbmidi_output_close(struct snd_rawmidi_substream *substream)
1162 {
1163         return substream_open(substream, 0, 0);
1164 }
1165 
1166 static void snd_usbmidi_output_trigger(struct snd_rawmidi_substream *substream,
1167                                        int up)
1168 {
1169         struct usbmidi_out_port *port =
1170                 (struct usbmidi_out_port *)substream->runtime->private_data;
1171 
1172         port->active = up;
1173         if (up) {
1174                 if (port->ep->umidi->disconnected) {
1175                         /* gobble up remaining bytes to prevent wait in
1176                          * snd_rawmidi_drain_output */
1177                         while (!snd_rawmidi_transmit_empty(substream))
1178                                 snd_rawmidi_transmit_ack(substream, 1);
1179                         return;
1180                 }
1181                 tasklet_schedule(&port->ep->tasklet);
1182         }
1183 }
1184 
1185 static void snd_usbmidi_output_drain(struct snd_rawmidi_substream *substream)
1186 {
1187         struct usbmidi_out_port *port = substream->runtime->private_data;
1188         struct snd_usb_midi_out_endpoint *ep = port->ep;
1189         unsigned int drain_urbs;
1190         DEFINE_WAIT(wait);
1191         long timeout = msecs_to_jiffies(50);
1192 
1193         if (ep->umidi->disconnected)
1194                 return;
1195         /*
1196          * The substream buffer is empty, but some data might still be in the
1197          * currently active URBs, so we have to wait for those to complete.
1198          */
1199         spin_lock_irq(&ep->buffer_lock);
1200         drain_urbs = ep->active_urbs;
1201         if (drain_urbs) {
1202                 ep->drain_urbs |= drain_urbs;
1203                 do {
1204                         prepare_to_wait(&ep->drain_wait, &wait,
1205                                         TASK_UNINTERRUPTIBLE);
1206                         spin_unlock_irq(&ep->buffer_lock);
1207                         timeout = schedule_timeout(timeout);
1208                         spin_lock_irq(&ep->buffer_lock);
1209                         drain_urbs &= ep->drain_urbs;
1210                 } while (drain_urbs && timeout);
1211                 finish_wait(&ep->drain_wait, &wait);
1212         }
1213         spin_unlock_irq(&ep->buffer_lock);
1214 }
1215 
1216 static int snd_usbmidi_input_open(struct snd_rawmidi_substream *substream)
1217 {
1218         return substream_open(substream, 1, 1);
1219 }
1220 
1221 static int snd_usbmidi_input_close(struct snd_rawmidi_substream *substream)
1222 {
1223         return substream_open(substream, 1, 0);
1224 }
1225 
1226 static void snd_usbmidi_input_trigger(struct snd_rawmidi_substream *substream,
1227                                       int up)
1228 {
1229         struct snd_usb_midi *umidi = substream->rmidi->private_data;
1230 
1231         if (up)
1232                 set_bit(substream->number, &umidi->input_triggered);
1233         else
1234                 clear_bit(substream->number, &umidi->input_triggered);
1235 }
1236 
1237 static const struct snd_rawmidi_ops snd_usbmidi_output_ops = {
1238         .open = snd_usbmidi_output_open,
1239         .close = snd_usbmidi_output_close,
1240         .trigger = snd_usbmidi_output_trigger,
1241         .drain = snd_usbmidi_output_drain,
1242 };
1243 
1244 static const struct snd_rawmidi_ops snd_usbmidi_input_ops = {
1245         .open = snd_usbmidi_input_open,
1246         .close = snd_usbmidi_input_close,
1247         .trigger = snd_usbmidi_input_trigger
1248 };
1249 
1250 static void free_urb_and_buffer(struct snd_usb_midi *umidi, struct urb *urb,
1251                                 unsigned int buffer_length)
1252 {
1253         usb_free_coherent(umidi->dev, buffer_length,
1254                           urb->transfer_buffer, urb->transfer_dma);
1255         usb_free_urb(urb);
1256 }
1257 
1258 /*
1259  * Frees an input endpoint.
1260  * May be called when ep hasn't been initialized completely.
1261  */
1262 static void snd_usbmidi_in_endpoint_delete(struct snd_usb_midi_in_endpoint *ep)
1263 {
1264         unsigned int i;
1265 
1266         for (i = 0; i < INPUT_URBS; ++i)
1267                 if (ep->urbs[i])
1268                         free_urb_and_buffer(ep->umidi, ep->urbs[i],
1269                                             ep->urbs[i]->transfer_buffer_length);
1270         kfree(ep);
1271 }
1272 
1273 /*
1274  * Creates an input endpoint.
1275  */
1276 static int snd_usbmidi_in_endpoint_create(struct snd_usb_midi *umidi,
1277                                           struct snd_usb_midi_endpoint_info *ep_info,
1278                                           struct snd_usb_midi_endpoint *rep)
1279 {
1280         struct snd_usb_midi_in_endpoint *ep;
1281         void *buffer;
1282         unsigned int pipe;
1283         int length;
1284         unsigned int i;
1285 
1286         rep->in = NULL;
1287         ep = kzalloc(sizeof(*ep), GFP_KERNEL);
1288         if (!ep)
1289                 return -ENOMEM;
1290         ep->umidi = umidi;
1291 
1292         for (i = 0; i < INPUT_URBS; ++i) {
1293                 ep->urbs[i] = usb_alloc_urb(0, GFP_KERNEL);
1294                 if (!ep->urbs[i]) {
1295                         snd_usbmidi_in_endpoint_delete(ep);
1296                         return -ENOMEM;
1297                 }
1298         }
1299         if (ep_info->in_interval)
1300                 pipe = usb_rcvintpipe(umidi->dev, ep_info->in_ep);
1301         else
1302                 pipe = usb_rcvbulkpipe(umidi->dev, ep_info->in_ep);
1303         length = usb_maxpacket(umidi->dev, pipe, 0);
1304         for (i = 0; i < INPUT_URBS; ++i) {
1305                 buffer = usb_alloc_coherent(umidi->dev, length, GFP_KERNEL,
1306                                             &ep->urbs[i]->transfer_dma);
1307                 if (!buffer) {
1308                         snd_usbmidi_in_endpoint_delete(ep);
1309                         return -ENOMEM;
1310                 }
1311                 if (ep_info->in_interval)
1312                         usb_fill_int_urb(ep->urbs[i], umidi->dev,
1313                                          pipe, buffer, length,
1314                                          snd_usbmidi_in_urb_complete,
1315                                          ep, ep_info->in_interval);
1316                 else
1317                         usb_fill_bulk_urb(ep->urbs[i], umidi->dev,
1318                                           pipe, buffer, length,
1319                                           snd_usbmidi_in_urb_complete, ep);
1320                 ep->urbs[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1321         }
1322 
1323         rep->in = ep;
1324         return 0;
1325 }
1326 
1327 /*
1328  * Frees an output endpoint.
1329  * May be called when ep hasn't been initialized completely.
1330  */
1331 static void snd_usbmidi_out_endpoint_clear(struct snd_usb_midi_out_endpoint *ep)
1332 {
1333         unsigned int i;
1334 
1335         for (i = 0; i < OUTPUT_URBS; ++i)
1336                 if (ep->urbs[i].urb) {
1337                         free_urb_and_buffer(ep->umidi, ep->urbs[i].urb,
1338                                             ep->max_transfer);
1339                         ep->urbs[i].urb = NULL;
1340                 }
1341 }
1342 
1343 static void snd_usbmidi_out_endpoint_delete(struct snd_usb_midi_out_endpoint *ep)
1344 {
1345         snd_usbmidi_out_endpoint_clear(ep);
1346         kfree(ep);
1347 }
1348 
1349 /*
1350  * Creates an output endpoint, and initializes output ports.
1351  */
1352 static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi *umidi,
1353                                            struct snd_usb_midi_endpoint_info *ep_info,
1354                                            struct snd_usb_midi_endpoint *rep)
1355 {
1356         struct snd_usb_midi_out_endpoint *ep;
1357         unsigned int i;
1358         unsigned int pipe;
1359         void *buffer;
1360 
1361         rep->out = NULL;
1362         ep = kzalloc(sizeof(*ep), GFP_KERNEL);
1363         if (!ep)
1364                 return -ENOMEM;
1365         ep->umidi = umidi;
1366 
1367         for (i = 0; i < OUTPUT_URBS; ++i) {
1368                 ep->urbs[i].urb = usb_alloc_urb(0, GFP_KERNEL);
1369                 if (!ep->urbs[i].urb) {
1370                         snd_usbmidi_out_endpoint_delete(ep);
1371                         return -ENOMEM;
1372                 }
1373                 ep->urbs[i].ep = ep;
1374         }
1375         if (ep_info->out_interval)
1376                 pipe = usb_sndintpipe(umidi->dev, ep_info->out_ep);
1377         else
1378                 pipe = usb_sndbulkpipe(umidi->dev, ep_info->out_ep);
1379         switch (umidi->usb_id) {
1380         default:
1381                 ep->max_transfer = usb_maxpacket(umidi->dev, pipe, 1);
1382                 break;
1383                 /*
1384                  * Various chips declare a packet size larger than 4 bytes, but
1385                  * do not actually work with larger packets:
1386                  */
1387         case USB_ID(0x0a67, 0x5011): /* Medeli DD305 */
1388         case USB_ID(0x0a92, 0x1020): /* ESI M4U */
1389         case USB_ID(0x1430, 0x474b): /* RedOctane GH MIDI INTERFACE */
1390         case USB_ID(0x15ca, 0x0101): /* Textech USB Midi Cable */
1391         case USB_ID(0x15ca, 0x1806): /* Textech USB Midi Cable */
1392         case USB_ID(0x1a86, 0x752d): /* QinHeng CH345 "USB2.0-MIDI" */
1393         case USB_ID(0xfc08, 0x0101): /* Unknown vendor Cable */
1394                 ep->max_transfer = 4;
1395                 break;
1396                 /*
1397                  * Some devices only work with 9 bytes packet size:
1398                  */
1399         case USB_ID(0x0644, 0x800E): /* Tascam US-122L */
1400         case USB_ID(0x0644, 0x800F): /* Tascam US-144 */
1401                 ep->max_transfer = 9;
1402                 break;
1403         }
1404         for (i = 0; i < OUTPUT_URBS; ++i) {
1405                 buffer = usb_alloc_coherent(umidi->dev,
1406                                             ep->max_transfer, GFP_KERNEL,
1407                                             &ep->urbs[i].urb->transfer_dma);
1408                 if (!buffer) {
1409                         snd_usbmidi_out_endpoint_delete(ep);
1410                         return -ENOMEM;
1411                 }
1412                 if (ep_info->out_interval)
1413                         usb_fill_int_urb(ep->urbs[i].urb, umidi->dev,
1414                                          pipe, buffer, ep->max_transfer,
1415                                          snd_usbmidi_out_urb_complete,
1416                                          &ep->urbs[i], ep_info->out_interval);
1417                 else
1418                         usb_fill_bulk_urb(ep->urbs[i].urb, umidi->dev,
1419                                           pipe, buffer, ep->max_transfer,
1420                                           snd_usbmidi_out_urb_complete,
1421                                           &ep->urbs[i]);
1422                 ep->urbs[i].urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1423         }
1424 
1425         spin_lock_init(&ep->buffer_lock);
1426         tasklet_init(&ep->tasklet, snd_usbmidi_out_tasklet, (unsigned long)ep);
1427         init_waitqueue_head(&ep->drain_wait);
1428 
1429         for (i = 0; i < 0x10; ++i)
1430                 if (ep_info->out_cables & (1 << i)) {
1431                         ep->ports[i].ep = ep;
1432                         ep->ports[i].cable = i << 4;
1433                 }
1434 
1435         if (umidi->usb_protocol_ops->init_out_endpoint)
1436                 umidi->usb_protocol_ops->init_out_endpoint(ep);
1437 
1438         rep->out = ep;
1439         return 0;
1440 }
1441 
1442 /*
1443  * Frees everything.
1444  */
1445 static void snd_usbmidi_free(struct snd_usb_midi *umidi)
1446 {
1447         int i;
1448 
1449         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1450                 struct snd_usb_midi_endpoint *ep = &umidi->endpoints[i];
1451                 if (ep->out)
1452                         snd_usbmidi_out_endpoint_delete(ep->out);
1453                 if (ep->in)
1454                         snd_usbmidi_in_endpoint_delete(ep->in);
1455         }
1456         mutex_destroy(&umidi->mutex);
1457         kfree(umidi);
1458 }
1459 
1460 /*
1461  * Unlinks all URBs (must be done before the usb_device is deleted).
1462  */
1463 void snd_usbmidi_disconnect(struct list_head *p)
1464 {
1465         struct snd_usb_midi *umidi;
1466         unsigned int i, j;
1467 
1468         umidi = list_entry(p, struct snd_usb_midi, list);
1469         /*
1470          * an URB's completion handler may start the timer and
1471          * a timer may submit an URB. To reliably break the cycle
1472          * a flag under lock must be used
1473          */
1474         down_write(&umidi->disc_rwsem);
1475         spin_lock_irq(&umidi->disc_lock);
1476         umidi->disconnected = 1;
1477         spin_unlock_irq(&umidi->disc_lock);
1478         up_write(&umidi->disc_rwsem);
1479 
1480         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1481                 struct snd_usb_midi_endpoint *ep = &umidi->endpoints[i];
1482                 if (ep->out)
1483                         tasklet_kill(&ep->out->tasklet);
1484                 if (ep->out) {
1485                         for (j = 0; j < OUTPUT_URBS; ++j)
1486                                 usb_kill_urb(ep->out->urbs[j].urb);
1487                         if (umidi->usb_protocol_ops->finish_out_endpoint)
1488                                 umidi->usb_protocol_ops->finish_out_endpoint(ep->out);
1489                         ep->out->active_urbs = 0;
1490                         if (ep->out->drain_urbs) {
1491                                 ep->out->drain_urbs = 0;
1492                                 wake_up(&ep->out->drain_wait);
1493                         }
1494                 }
1495                 if (ep->in)
1496                         for (j = 0; j < INPUT_URBS; ++j)
1497                                 usb_kill_urb(ep->in->urbs[j]);
1498                 /* free endpoints here; later call can result in Oops */
1499                 if (ep->out)
1500                         snd_usbmidi_out_endpoint_clear(ep->out);
1501                 if (ep->in) {
1502                         snd_usbmidi_in_endpoint_delete(ep->in);
1503                         ep->in = NULL;
1504                 }
1505         }
1506         del_timer_sync(&umidi->error_timer);
1507 }
1508 EXPORT_SYMBOL(snd_usbmidi_disconnect);
1509 
1510 static void snd_usbmidi_rawmidi_free(struct snd_rawmidi *rmidi)
1511 {
1512         struct snd_usb_midi *umidi = rmidi->private_data;
1513         snd_usbmidi_free(umidi);
1514 }
1515 
1516 static struct snd_rawmidi_substream *snd_usbmidi_find_substream(struct snd_usb_midi *umidi,
1517                                                                 int stream,
1518                                                                 int number)
1519 {
1520         struct snd_rawmidi_substream *substream;
1521 
1522         list_for_each_entry(substream, &umidi->rmidi->streams[stream].substreams,
1523                             list) {
1524                 if (substream->number == number)
1525                         return substream;
1526         }
1527         return NULL;
1528 }
1529 
1530 /*
1531  * This list specifies names for ports that do not fit into the standard
1532  * "(product) MIDI (n)" schema because they aren't external MIDI ports,
1533  * such as internal control or synthesizer ports.
1534  */
1535 static struct port_info {
1536         u32 id;
1537         short int port;
1538         short int voices;
1539         const char *name;
1540         unsigned int seq_flags;
1541 } snd_usbmidi_port_info[] = {
1542 #define PORT_INFO(vendor, product, num, name_, voices_, flags) \
1543         { .id = USB_ID(vendor, product), \
1544           .port = num, .voices = voices_, \
1545           .name = name_, .seq_flags = flags }
1546 #define EXTERNAL_PORT(vendor, product, num, name) \
1547         PORT_INFO(vendor, product, num, name, 0, \
1548                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1549                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1550                   SNDRV_SEQ_PORT_TYPE_PORT)
1551 #define CONTROL_PORT(vendor, product, num, name) \
1552         PORT_INFO(vendor, product, num, name, 0, \
1553                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1554                   SNDRV_SEQ_PORT_TYPE_HARDWARE)
1555 #define GM_SYNTH_PORT(vendor, product, num, name, voices) \
1556         PORT_INFO(vendor, product, num, name, voices, \
1557                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1558                   SNDRV_SEQ_PORT_TYPE_MIDI_GM | \
1559                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1560                   SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
1561 #define ROLAND_SYNTH_PORT(vendor, product, num, name, voices) \
1562         PORT_INFO(vendor, product, num, name, voices, \
1563                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1564                   SNDRV_SEQ_PORT_TYPE_MIDI_GM | \
1565                   SNDRV_SEQ_PORT_TYPE_MIDI_GM2 | \
1566                   SNDRV_SEQ_PORT_TYPE_MIDI_GS | \
1567                   SNDRV_SEQ_PORT_TYPE_MIDI_XG | \
1568                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1569                   SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
1570 #define SOUNDCANVAS_PORT(vendor, product, num, name, voices) \
1571         PORT_INFO(vendor, product, num, name, voices, \
1572                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1573                   SNDRV_SEQ_PORT_TYPE_MIDI_GM | \
1574                   SNDRV_SEQ_PORT_TYPE_MIDI_GM2 | \
1575                   SNDRV_SEQ_PORT_TYPE_MIDI_GS | \
1576                   SNDRV_SEQ_PORT_TYPE_MIDI_XG | \
1577                   SNDRV_SEQ_PORT_TYPE_MIDI_MT32 | \
1578                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1579                   SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
1580         /* Yamaha MOTIF XF */
1581         GM_SYNTH_PORT(0x0499, 0x105c, 0, "%s Tone Generator", 128),
1582         CONTROL_PORT(0x0499, 0x105c, 1, "%s Remote Control"),
1583         EXTERNAL_PORT(0x0499, 0x105c, 2, "%s Thru"),
1584         CONTROL_PORT(0x0499, 0x105c, 3, "%s Editor"),
1585         /* Roland UA-100 */
1586         CONTROL_PORT(0x0582, 0x0000, 2, "%s Control"),
1587         /* Roland SC-8850 */
1588         SOUNDCANVAS_PORT(0x0582, 0x0003, 0, "%s Part A", 128),
1589         SOUNDCANVAS_PORT(0x0582, 0x0003, 1, "%s Part B", 128),
1590         SOUNDCANVAS_PORT(0x0582, 0x0003, 2, "%s Part C", 128),
1591         SOUNDCANVAS_PORT(0x0582, 0x0003, 3, "%s Part D", 128),
1592         EXTERNAL_PORT(0x0582, 0x0003, 4, "%s MIDI 1"),
1593         EXTERNAL_PORT(0x0582, 0x0003, 5, "%s MIDI 2"),
1594         /* Roland U-8 */
1595         EXTERNAL_PORT(0x0582, 0x0004, 0, "%s MIDI"),
1596         CONTROL_PORT(0x0582, 0x0004, 1, "%s Control"),
1597         /* Roland SC-8820 */
1598         SOUNDCANVAS_PORT(0x0582, 0x0007, 0, "%s Part A", 64),
1599         SOUNDCANVAS_PORT(0x0582, 0x0007, 1, "%s Part B", 64),
1600         EXTERNAL_PORT(0x0582, 0x0007, 2, "%s MIDI"),
1601         /* Roland SK-500 */
1602         SOUNDCANVAS_PORT(0x0582, 0x000b, 0, "%s Part A", 64),
1603         SOUNDCANVAS_PORT(0x0582, 0x000b, 1, "%s Part B", 64),
1604         EXTERNAL_PORT(0x0582, 0x000b, 2, "%s MIDI"),
1605         /* Roland SC-D70 */
1606         SOUNDCANVAS_PORT(0x0582, 0x000c, 0, "%s Part A", 64),
1607         SOUNDCANVAS_PORT(0x0582, 0x000c, 1, "%s Part B", 64),
1608         EXTERNAL_PORT(0x0582, 0x000c, 2, "%s MIDI"),
1609         /* Edirol UM-880 */
1610         CONTROL_PORT(0x0582, 0x0014, 8, "%s Control"),
1611         /* Edirol SD-90 */
1612         ROLAND_SYNTH_PORT(0x0582, 0x0016, 0, "%s Part A", 128),
1613         ROLAND_SYNTH_PORT(0x0582, 0x0016, 1, "%s Part B", 128),
1614         EXTERNAL_PORT(0x0582, 0x0016, 2, "%s MIDI 1"),
1615         EXTERNAL_PORT(0x0582, 0x0016, 3, "%s MIDI 2"),
1616         /* Edirol UM-550 */
1617         CONTROL_PORT(0x0582, 0x0023, 5, "%s Control"),
1618         /* Edirol SD-20 */
1619         ROLAND_SYNTH_PORT(0x0582, 0x0027, 0, "%s Part A", 64),
1620         ROLAND_SYNTH_PORT(0x0582, 0x0027, 1, "%s Part B", 64),
1621         EXTERNAL_PORT(0x0582, 0x0027, 2, "%s MIDI"),
1622         /* Edirol SD-80 */
1623         ROLAND_SYNTH_PORT(0x0582, 0x0029, 0, "%s Part A", 128),
1624         ROLAND_SYNTH_PORT(0x0582, 0x0029, 1, "%s Part B", 128),
1625         EXTERNAL_PORT(0x0582, 0x0029, 2, "%s MIDI 1"),
1626         EXTERNAL_PORT(0x0582, 0x0029, 3, "%s MIDI 2"),
1627         /* Edirol UA-700 */
1628         EXTERNAL_PORT(0x0582, 0x002b, 0, "%s MIDI"),
1629         CONTROL_PORT(0x0582, 0x002b, 1, "%s Control"),
1630         /* Roland VariOS */
1631         EXTERNAL_PORT(0x0582, 0x002f, 0, "%s MIDI"),
1632         EXTERNAL_PORT(0x0582, 0x002f, 1, "%s External MIDI"),
1633         EXTERNAL_PORT(0x0582, 0x002f, 2, "%s Sync"),
1634         /* Edirol PCR */
1635         EXTERNAL_PORT(0x0582, 0x0033, 0, "%s MIDI"),
1636         EXTERNAL_PORT(0x0582, 0x0033, 1, "%s 1"),
1637         EXTERNAL_PORT(0x0582, 0x0033, 2, "%s 2"),
1638         /* BOSS GS-10 */
1639         EXTERNAL_PORT(0x0582, 0x003b, 0, "%s MIDI"),
1640         CONTROL_PORT(0x0582, 0x003b, 1, "%s Control"),
1641         /* Edirol UA-1000 */
1642         EXTERNAL_PORT(0x0582, 0x0044, 0, "%s MIDI"),
1643         CONTROL_PORT(0x0582, 0x0044, 1, "%s Control"),
1644         /* Edirol UR-80 */
1645         EXTERNAL_PORT(0x0582, 0x0048, 0, "%s MIDI"),
1646         EXTERNAL_PORT(0x0582, 0x0048, 1, "%s 1"),
1647         EXTERNAL_PORT(0x0582, 0x0048, 2, "%s 2"),
1648         /* Edirol PCR-A */
1649         EXTERNAL_PORT(0x0582, 0x004d, 0, "%s MIDI"),
1650         EXTERNAL_PORT(0x0582, 0x004d, 1, "%s 1"),
1651         EXTERNAL_PORT(0x0582, 0x004d, 2, "%s 2"),
1652         /* BOSS GT-PRO */
1653         CONTROL_PORT(0x0582, 0x0089, 0, "%s Control"),
1654         /* Edirol UM-3EX */
1655         CONTROL_PORT(0x0582, 0x009a, 3, "%s Control"),
1656         /* Roland VG-99 */
1657         CONTROL_PORT(0x0582, 0x00b2, 0, "%s Control"),
1658         EXTERNAL_PORT(0x0582, 0x00b2, 1, "%s MIDI"),
1659         /* Cakewalk Sonar V-Studio 100 */
1660         EXTERNAL_PORT(0x0582, 0x00eb, 0, "%s MIDI"),
1661         CONTROL_PORT(0x0582, 0x00eb, 1, "%s Control"),
1662         /* Roland VB-99 */
1663         CONTROL_PORT(0x0582, 0x0102, 0, "%s Control"),
1664         EXTERNAL_PORT(0x0582, 0x0102, 1, "%s MIDI"),
1665         /* Roland A-PRO */
1666         EXTERNAL_PORT(0x0582, 0x010f, 0, "%s MIDI"),
1667         CONTROL_PORT(0x0582, 0x010f, 1, "%s 1"),
1668         CONTROL_PORT(0x0582, 0x010f, 2, "%s 2"),
1669         /* Roland SD-50 */
1670         ROLAND_SYNTH_PORT(0x0582, 0x0114, 0, "%s Synth", 128),
1671         EXTERNAL_PORT(0x0582, 0x0114, 1, "%s MIDI"),
1672         CONTROL_PORT(0x0582, 0x0114, 2, "%s Control"),
1673         /* Roland OCTA-CAPTURE */
1674         EXTERNAL_PORT(0x0582, 0x0120, 0, "%s MIDI"),
1675         CONTROL_PORT(0x0582, 0x0120, 1, "%s Control"),
1676         EXTERNAL_PORT(0x0582, 0x0121, 0, "%s MIDI"),
1677         CONTROL_PORT(0x0582, 0x0121, 1, "%s Control"),
1678         /* Roland SPD-SX */
1679         CONTROL_PORT(0x0582, 0x0145, 0, "%s Control"),
1680         EXTERNAL_PORT(0x0582, 0x0145, 1, "%s MIDI"),
1681         /* Roland A-Series */
1682         CONTROL_PORT(0x0582, 0x0156, 0, "%s Keyboard"),
1683         EXTERNAL_PORT(0x0582, 0x0156, 1, "%s MIDI"),
1684         /* Roland INTEGRA-7 */
1685         ROLAND_SYNTH_PORT(0x0582, 0x015b, 0, "%s Synth", 128),
1686         CONTROL_PORT(0x0582, 0x015b, 1, "%s Control"),
1687         /* M-Audio MidiSport 8x8 */
1688         CONTROL_PORT(0x0763, 0x1031, 8, "%s Control"),
1689         CONTROL_PORT(0x0763, 0x1033, 8, "%s Control"),
1690         /* MOTU Fastlane */
1691         EXTERNAL_PORT(0x07fd, 0x0001, 0, "%s MIDI A"),
1692         EXTERNAL_PORT(0x07fd, 0x0001, 1, "%s MIDI B"),
1693         /* Emagic Unitor8/AMT8/MT4 */
1694         EXTERNAL_PORT(0x086a, 0x0001, 8, "%s Broadcast"),
1695         EXTERNAL_PORT(0x086a, 0x0002, 8, "%s Broadcast"),
1696         EXTERNAL_PORT(0x086a, 0x0003, 4, "%s Broadcast"),
1697         /* Akai MPD16 */
1698         CONTROL_PORT(0x09e8, 0x0062, 0, "%s Control"),
1699         PORT_INFO(0x09e8, 0x0062, 1, "%s MIDI", 0,
1700                 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
1701                 SNDRV_SEQ_PORT_TYPE_HARDWARE),
1702         /* Access Music Virus TI */
1703         EXTERNAL_PORT(0x133e, 0x0815, 0, "%s MIDI"),
1704         PORT_INFO(0x133e, 0x0815, 1, "%s Synth", 0,
1705                 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
1706                 SNDRV_SEQ_PORT_TYPE_HARDWARE |
1707                 SNDRV_SEQ_PORT_TYPE_SYNTHESIZER),
1708 };
1709 
1710 static struct port_info *find_port_info(struct snd_usb_midi *umidi, int number)
1711 {
1712         int i;
1713 
1714         for (i = 0; i < ARRAY_SIZE(snd_usbmidi_port_info); ++i) {
1715                 if (snd_usbmidi_port_info[i].id == umidi->usb_id &&
1716                     snd_usbmidi_port_info[i].port == number)
1717                         return &snd_usbmidi_port_info[i];
1718         }
1719         return NULL;
1720 }
1721 
1722 static void snd_usbmidi_get_port_info(struct snd_rawmidi *rmidi, int number,
1723                                       struct snd_seq_port_info *seq_port_info)
1724 {
1725         struct snd_usb_midi *umidi = rmidi->private_data;
1726         struct port_info *port_info;
1727 
1728         /* TODO: read port flags from descriptors */
1729         port_info = find_port_info(umidi, number);
1730         if (port_info) {
1731                 seq_port_info->type = port_info->seq_flags;
1732                 seq_port_info->midi_voices = port_info->voices;
1733         }
1734 }
1735 
1736 static void snd_usbmidi_init_substream(struct snd_usb_midi *umidi,
1737                                        int stream, int number,
1738                                        struct snd_rawmidi_substream **rsubstream)
1739 {
1740         struct port_info *port_info;
1741         const char *name_format;
1742 
1743         struct snd_rawmidi_substream *substream =
1744                 snd_usbmidi_find_substream(umidi, stream, number);
1745         if (!substream) {
1746                 dev_err(&umidi->dev->dev, "substream %d:%d not found\n", stream,
1747                         number);
1748                 return;
1749         }
1750 
1751         /* TODO: read port name from jack descriptor */
1752         port_info = find_port_info(umidi, number);
1753         name_format = port_info ? port_info->name : "%s MIDI %d";
1754         snprintf(substream->name, sizeof(substream->name),
1755                  name_format, umidi->card->shortname, number + 1);
1756 
1757         *rsubstream = substream;
1758 }
1759 
1760 /*
1761  * Creates the endpoints and their ports.
1762  */
1763 static int snd_usbmidi_create_endpoints(struct snd_usb_midi *umidi,
1764                                         struct snd_usb_midi_endpoint_info *endpoints)
1765 {
1766         int i, j, err;
1767         int out_ports = 0, in_ports = 0;
1768 
1769         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1770                 if (endpoints[i].out_cables) {
1771                         err = snd_usbmidi_out_endpoint_create(umidi,
1772                                                               &endpoints[i],
1773                                                               &umidi->endpoints[i]);
1774                         if (err < 0)
1775                                 return err;
1776                 }
1777                 if (endpoints[i].in_cables) {
1778                         err = snd_usbmidi_in_endpoint_create(umidi,
1779                                                              &endpoints[i],
1780                                                              &umidi->endpoints[i]);
1781                         if (err < 0)
1782                                 return err;
1783                 }
1784 
1785                 for (j = 0; j < 0x10; ++j) {
1786                         if (endpoints[i].out_cables & (1 << j)) {
1787                                 snd_usbmidi_init_substream(umidi,
1788                                                            SNDRV_RAWMIDI_STREAM_OUTPUT,
1789                                                            out_ports,
1790                                                            &umidi->endpoints[i].out->ports[j].substream);
1791                                 ++out_ports;
1792                         }
1793                         if (endpoints[i].in_cables & (1 << j)) {
1794                                 snd_usbmidi_init_substream(umidi,
1795                                                            SNDRV_RAWMIDI_STREAM_INPUT,
1796                                                            in_ports,
1797                                                            &umidi->endpoints[i].in->ports[j].substream);
1798                                 ++in_ports;
1799                         }
1800                 }
1801         }
1802         dev_dbg(&umidi->dev->dev, "created %d output and %d input ports\n",
1803                     out_ports, in_ports);
1804         return 0;
1805 }
1806 
1807 /*
1808  * Returns MIDIStreaming device capabilities.
1809  */
1810 static int snd_usbmidi_get_ms_info(struct snd_usb_midi *umidi,
1811                                    struct snd_usb_midi_endpoint_info *endpoints)
1812 {
1813         struct usb_interface *intf;
1814         struct usb_host_interface *hostif;
1815         struct usb_interface_descriptor *intfd;
1816         struct usb_ms_header_descriptor *ms_header;
1817         struct usb_host_endpoint *hostep;
1818         struct usb_endpoint_descriptor *ep;
1819         struct usb_ms_endpoint_descriptor *ms_ep;
1820         int i, epidx;
1821 
1822         intf = umidi->iface;
1823         if (!intf)
1824                 return -ENXIO;
1825         hostif = &intf->altsetting[0];
1826         intfd = get_iface_desc(hostif);
1827         ms_header = (struct usb_ms_header_descriptor *)hostif->extra;
1828         if (hostif->extralen >= 7 &&
1829             ms_header->bLength >= 7 &&
1830             ms_header->bDescriptorType == USB_DT_CS_INTERFACE &&
1831             ms_header->bDescriptorSubtype == UAC_HEADER)
1832                 dev_dbg(&umidi->dev->dev, "MIDIStreaming version %02x.%02x\n",
1833                             ms_header->bcdMSC[1], ms_header->bcdMSC[0]);
1834         else
1835                 dev_warn(&umidi->dev->dev,
1836                          "MIDIStreaming interface descriptor not found\n");
1837 
1838         epidx = 0;
1839         for (i = 0; i < intfd->bNumEndpoints; ++i) {
1840                 hostep = &hostif->endpoint[i];
1841                 ep = get_ep_desc(hostep);
1842                 if (!usb_endpoint_xfer_bulk(ep) && !usb_endpoint_xfer_int(ep))
1843                         continue;
1844                 ms_ep = (struct usb_ms_endpoint_descriptor *)hostep->extra;
1845                 if (hostep->extralen < 4 ||
1846                     ms_ep->bLength < 4 ||
1847                     ms_ep->bDescriptorType != USB_DT_CS_ENDPOINT ||
1848                     ms_ep->bDescriptorSubtype != UAC_MS_GENERAL)
1849                         continue;
1850                 if (usb_endpoint_dir_out(ep)) {
1851                         if (endpoints[epidx].out_ep) {
1852                                 if (++epidx >= MIDI_MAX_ENDPOINTS) {
1853                                         dev_warn(&umidi->dev->dev,
1854                                                  "too many endpoints\n");
1855                                         break;
1856                                 }
1857                         }
1858                         endpoints[epidx].out_ep = usb_endpoint_num(ep);
1859                         if (usb_endpoint_xfer_int(ep))
1860                                 endpoints[epidx].out_interval = ep->bInterval;
1861                         else if (snd_usb_get_speed(umidi->dev) == USB_SPEED_LOW)
1862                                 /*
1863                                  * Low speed bulk transfers don't exist, so
1864                                  * force interrupt transfers for devices like
1865                                  * ESI MIDI Mate that try to use them anyway.
1866                                  */
1867                                 endpoints[epidx].out_interval = 1;
1868                         endpoints[epidx].out_cables =
1869                                 (1 << ms_ep->bNumEmbMIDIJack) - 1;
1870                         dev_dbg(&umidi->dev->dev, "EP %02X: %d jack(s)\n",
1871                                 ep->bEndpointAddress, ms_ep->bNumEmbMIDIJack);
1872                 } else {
1873                         if (endpoints[epidx].in_ep) {
1874                                 if (++epidx >= MIDI_MAX_ENDPOINTS) {
1875                                         dev_warn(&umidi->dev->dev,
1876                                                  "too many endpoints\n");
1877                                         break;
1878                                 }
1879                         }
1880                         endpoints[epidx].in_ep = usb_endpoint_num(ep);
1881                         if (usb_endpoint_xfer_int(ep))
1882                                 endpoints[epidx].in_interval = ep->bInterval;
1883                         else if (snd_usb_get_speed(umidi->dev) == USB_SPEED_LOW)
1884                                 endpoints[epidx].in_interval = 1;
1885                         endpoints[epidx].in_cables =
1886                                 (1 << ms_ep->bNumEmbMIDIJack) - 1;
1887                         dev_dbg(&umidi->dev->dev, "EP %02X: %d jack(s)\n",
1888                                 ep->bEndpointAddress, ms_ep->bNumEmbMIDIJack);
1889                 }
1890         }
1891         return 0;
1892 }
1893 
1894 static int roland_load_info(struct snd_kcontrol *kcontrol,
1895                             struct snd_ctl_elem_info *info)
1896 {
1897         static const char *const names[] = { "High Load", "Light Load" };
1898 
1899         return snd_ctl_enum_info(info, 1, 2, names);
1900 }
1901 
1902 static int roland_load_get(struct snd_kcontrol *kcontrol,
1903                            struct snd_ctl_elem_value *value)
1904 {
1905         value->value.enumerated.item[0] = kcontrol->private_value;
1906         return 0;
1907 }
1908 
1909 static int roland_load_put(struct snd_kcontrol *kcontrol,
1910                            struct snd_ctl_elem_value *value)
1911 {
1912         struct snd_usb_midi *umidi = kcontrol->private_data;
1913         int changed;
1914 
1915         if (value->value.enumerated.item[0] > 1)
1916                 return -EINVAL;
1917         mutex_lock(&umidi->mutex);
1918         changed = value->value.enumerated.item[0] != kcontrol->private_value;
1919         if (changed)
1920                 kcontrol->private_value = value->value.enumerated.item[0];
1921         mutex_unlock(&umidi->mutex);
1922         return changed;
1923 }
1924 
1925 static const struct snd_kcontrol_new roland_load_ctl = {
1926         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1927         .name = "MIDI Input Mode",
1928         .info = roland_load_info,
1929         .get = roland_load_get,
1930         .put = roland_load_put,
1931         .private_value = 1,
1932 };
1933 
1934 /*
1935  * On Roland devices, use the second alternate setting to be able to use
1936  * the interrupt input endpoint.
1937  */
1938 static void snd_usbmidi_switch_roland_altsetting(struct snd_usb_midi *umidi)
1939 {
1940         struct usb_interface *intf;
1941         struct usb_host_interface *hostif;
1942         struct usb_interface_descriptor *intfd;
1943 
1944         intf = umidi->iface;
1945         if (!intf || intf->num_altsetting != 2)
1946                 return;
1947 
1948         hostif = &intf->altsetting[1];
1949         intfd = get_iface_desc(hostif);
1950        /* If either or both of the endpoints support interrupt transfer,
1951         * then use the alternate setting
1952         */
1953         if (intfd->bNumEndpoints != 2 ||
1954             !((get_endpoint(hostif, 0)->bmAttributes &
1955                USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT ||
1956               (get_endpoint(hostif, 1)->bmAttributes &
1957                USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT))
1958                 return;
1959 
1960         dev_dbg(&umidi->dev->dev, "switching to altsetting %d with int ep\n",
1961                     intfd->bAlternateSetting);
1962         usb_set_interface(umidi->dev, intfd->bInterfaceNumber,
1963                           intfd->bAlternateSetting);
1964 
1965         umidi->roland_load_ctl = snd_ctl_new1(&roland_load_ctl, umidi);
1966         if (snd_ctl_add(umidi->card, umidi->roland_load_ctl) < 0)
1967                 umidi->roland_load_ctl = NULL;
1968 }
1969 
1970 /*
1971  * Try to find any usable endpoints in the interface.
1972  */
1973 static int snd_usbmidi_detect_endpoints(struct snd_usb_midi *umidi,
1974                                         struct snd_usb_midi_endpoint_info *endpoint,
1975                                         int max_endpoints)
1976 {
1977         struct usb_interface *intf;
1978         struct usb_host_interface *hostif;
1979         struct usb_interface_descriptor *intfd;
1980         struct usb_endpoint_descriptor *epd;
1981         int i, out_eps = 0, in_eps = 0;
1982 
1983         if (USB_ID_VENDOR(umidi->usb_id) == 0x0582)
1984                 snd_usbmidi_switch_roland_altsetting(umidi);
1985 
1986         if (endpoint[0].out_ep || endpoint[0].in_ep)
1987                 return 0;
1988 
1989         intf = umidi->iface;
1990         if (!intf || intf->num_altsetting < 1)
1991                 return -ENOENT;
1992         hostif = intf->cur_altsetting;
1993         intfd = get_iface_desc(hostif);
1994 
1995         for (i = 0; i < intfd->bNumEndpoints; ++i) {
1996                 epd = get_endpoint(hostif, i);
1997                 if (!usb_endpoint_xfer_bulk(epd) &&
1998                     !usb_endpoint_xfer_int(epd))
1999                         continue;
2000                 if (out_eps < max_endpoints &&
2001                     usb_endpoint_dir_out(epd)) {
2002                         endpoint[out_eps].out_ep = usb_endpoint_num(epd);
2003                         if (usb_endpoint_xfer_int(epd))
2004                                 endpoint[out_eps].out_interval = epd->bInterval;
2005                         ++out_eps;
2006                 }
2007                 if (in_eps < max_endpoints &&
2008                     usb_endpoint_dir_in(epd)) {
2009                         endpoint[in_eps].in_ep = usb_endpoint_num(epd);
2010                         if (usb_endpoint_xfer_int(epd))
2011                                 endpoint[in_eps].in_interval = epd->bInterval;
2012                         ++in_eps;
2013                 }
2014         }
2015         return (out_eps || in_eps) ? 0 : -ENOENT;
2016 }
2017 
2018 /*
2019  * Detects the endpoints for one-port-per-endpoint protocols.
2020  */
2021 static int snd_usbmidi_detect_per_port_endpoints(struct snd_usb_midi *umidi,
2022                                                  struct snd_usb_midi_endpoint_info *endpoints)
2023 {
2024         int err, i;
2025 
2026         err = snd_usbmidi_detect_endpoints(umidi, endpoints, MIDI_MAX_ENDPOINTS);
2027         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
2028                 if (endpoints[i].out_ep)
2029                         endpoints[i].out_cables = 0x0001;
2030                 if (endpoints[i].in_ep)
2031                         endpoints[i].in_cables = 0x0001;
2032         }
2033         return err;
2034 }
2035 
2036 /*
2037  * Detects the endpoints and ports of Yamaha devices.
2038  */
2039 static int snd_usbmidi_detect_yamaha(struct snd_usb_midi *umidi,
2040                                      struct snd_usb_midi_endpoint_info *endpoint)
2041 {
2042         struct usb_interface *intf;
2043         struct usb_host_interface *hostif;
2044         struct usb_interface_descriptor *intfd;
2045         uint8_t *cs_desc;
2046 
2047         intf = umidi->iface;
2048         if (!intf)
2049                 return -ENOENT;
2050         hostif = intf->altsetting;
2051         intfd = get_iface_desc(hostif);
2052         if (intfd->bNumEndpoints < 1)
2053                 return -ENOENT;
2054 
2055         /*
2056          * For each port there is one MIDI_IN/OUT_JACK descriptor, not
2057          * necessarily with any useful contents.  So simply count 'em.
2058          */
2059         for (cs_desc = hostif->extra;
2060              cs_desc < hostif->extra + hostif->extralen && cs_desc[0] >= 2;
2061              cs_desc += cs_desc[0]) {
2062                 if (cs_desc[1] == USB_DT_CS_INTERFACE) {
2063                         if (cs_desc[2] == UAC_MIDI_IN_JACK)
2064                                 endpoint->in_cables =
2065                                         (endpoint->in_cables << 1) | 1;
2066                         else if (cs_desc[2] == UAC_MIDI_OUT_JACK)
2067                                 endpoint->out_cables =
2068                                         (endpoint->out_cables << 1) | 1;
2069                 }
2070         }
2071         if (!endpoint->in_cables && !endpoint->out_cables)
2072                 return -ENOENT;
2073 
2074         return snd_usbmidi_detect_endpoints(umidi, endpoint, 1);
2075 }
2076 
2077 /*
2078  * Detects the endpoints and ports of Roland devices.
2079  */
2080 static int snd_usbmidi_detect_roland(struct snd_usb_midi *umidi,
2081                                      struct snd_usb_midi_endpoint_info *endpoint)
2082 {
2083         struct usb_interface *intf;
2084         struct usb_host_interface *hostif;
2085         u8 *cs_desc;
2086 
2087         intf = umidi->iface;
2088         if (!intf)
2089                 return -ENOENT;
2090         hostif = intf->altsetting;
2091         /*
2092          * Some devices have a descriptor <06 24 F1 02 <inputs> <outputs>>,
2093          * some have standard class descriptors, or both kinds, or neither.
2094          */
2095         for (cs_desc = hostif->extra;
2096              cs_desc < hostif->extra + hostif->extralen && cs_desc[0] >= 2;
2097              cs_desc += cs_desc[0]) {
2098                 if (cs_desc[0] >= 6 &&
2099                     cs_desc[1] == USB_DT_CS_INTERFACE &&
2100                     cs_desc[2] == 0xf1 &&
2101                     cs_desc[3] == 0x02) {
2102                         endpoint->in_cables  = (1 << cs_desc[4]) - 1;
2103                         endpoint->out_cables = (1 << cs_desc[5]) - 1;
2104                         return snd_usbmidi_detect_endpoints(umidi, endpoint, 1);
2105                 } else if (cs_desc[0] >= 7 &&
2106                            cs_desc[1] == USB_DT_CS_INTERFACE &&
2107                            cs_desc[2] == UAC_HEADER) {
2108                         return snd_usbmidi_get_ms_info(umidi, endpoint);
2109                 }
2110         }
2111 
2112         return -ENODEV;
2113 }
2114 
2115 /*
2116  * Creates the endpoints and their ports for Midiman devices.
2117  */
2118 static int snd_usbmidi_create_endpoints_midiman(struct snd_usb_midi *umidi,
2119                                                 struct snd_usb_midi_endpoint_info *endpoint)
2120 {
2121         struct snd_usb_midi_endpoint_info ep_info;
2122         struct usb_interface *intf;
2123         struct usb_host_interface *hostif;
2124         struct usb_interface_descriptor *intfd;
2125         struct usb_endpoint_descriptor *epd;
2126         int cable, err;
2127 
2128         intf = umidi->iface;
2129         if (!intf)
2130                 return -ENOENT;
2131         hostif = intf->altsetting;
2132         intfd = get_iface_desc(hostif);
2133         /*
2134          * The various MidiSport devices have more or less random endpoint
2135          * numbers, so we have to identify the endpoints by their index in
2136          * the descriptor array, like the driver for that other OS does.
2137          *
2138          * There is one interrupt input endpoint for all input ports, one
2139          * bulk output endpoint for even-numbered ports, and one for odd-
2140          * numbered ports.  Both bulk output endpoints have corresponding
2141          * input bulk endpoints (at indices 1 and 3) which aren't used.
2142          */
2143         if (intfd->bNumEndpoints < (endpoint->out_cables > 0x0001 ? 5 : 3)) {
2144                 dev_dbg(&umidi->dev->dev, "not enough endpoints\n");
2145                 return -ENOENT;
2146         }
2147 
2148         epd = get_endpoint(hostif, 0);
2149         if (!usb_endpoint_dir_in(epd) || !usb_endpoint_xfer_int(epd)) {
2150                 dev_dbg(&umidi->dev->dev, "endpoint[0] isn't interrupt\n");
2151                 return -ENXIO;
2152         }
2153         epd = get_endpoint(hostif, 2);
2154         if (!usb_endpoint_dir_out(epd) || !usb_endpoint_xfer_bulk(epd)) {
2155                 dev_dbg(&umidi->dev->dev, "endpoint[2] isn't bulk output\n");
2156                 return -ENXIO;
2157         }
2158         if (endpoint->out_cables > 0x0001) {
2159                 epd = get_endpoint(hostif, 4);
2160                 if (!usb_endpoint_dir_out(epd) ||
2161                     !usb_endpoint_xfer_bulk(epd)) {
2162                         dev_dbg(&umidi->dev->dev,
2163                                 "endpoint[4] isn't bulk output\n");
2164                         return -ENXIO;
2165                 }
2166         }
2167 
2168         ep_info.out_ep = get_endpoint(hostif, 2)->bEndpointAddress &
2169                 USB_ENDPOINT_NUMBER_MASK;
2170         ep_info.out_interval = 0;
2171         ep_info.out_cables = endpoint->out_cables & 0x5555;
2172         err = snd_usbmidi_out_endpoint_create(umidi, &ep_info,
2173                                               &umidi->endpoints[0]);
2174         if (err < 0)
2175                 return err;
2176 
2177         ep_info.in_ep = get_endpoint(hostif, 0)->bEndpointAddress &
2178                 USB_ENDPOINT_NUMBER_MASK;
2179         ep_info.in_interval = get_endpoint(hostif, 0)->bInterval;
2180         ep_info.in_cables = endpoint->in_cables;
2181         err = snd_usbmidi_in_endpoint_create(umidi, &ep_info,
2182                                              &umidi->endpoints[0]);
2183         if (err < 0)
2184                 return err;
2185 
2186         if (endpoint->out_cables > 0x0001) {
2187                 ep_info.out_ep = get_endpoint(hostif, 4)->bEndpointAddress &
2188                         USB_ENDPOINT_NUMBER_MASK;
2189                 ep_info.out_cables = endpoint->out_cables & 0xaaaa;
2190                 err = snd_usbmidi_out_endpoint_create(umidi, &ep_info,
2191                                                       &umidi->endpoints[1]);
2192                 if (err < 0)
2193                         return err;
2194         }
2195 
2196         for (cable = 0; cable < 0x10; ++cable) {
2197                 if (endpoint->out_cables & (1 << cable))
2198                         snd_usbmidi_init_substream(umidi,
2199                                                    SNDRV_RAWMIDI_STREAM_OUTPUT,
2200                                                    cable,
2201                                                    &umidi->endpoints[cable & 1].out->ports[cable].substream);
2202                 if (endpoint->in_cables & (1 << cable))
2203                         snd_usbmidi_init_substream(umidi,
2204                                                    SNDRV_RAWMIDI_STREAM_INPUT,
2205                                                    cable,
2206                                                    &umidi->endpoints[0].in->ports[cable].substream);
2207         }
2208         return 0;
2209 }
2210 
2211 static const struct snd_rawmidi_global_ops snd_usbmidi_ops = {
2212         .get_port_info = snd_usbmidi_get_port_info,
2213 };
2214 
2215 static int snd_usbmidi_create_rawmidi(struct snd_usb_midi *umidi,
2216                                       int out_ports, int in_ports)
2217 {
2218         struct snd_rawmidi *rmidi;
2219         int err;
2220 
2221         err = snd_rawmidi_new(umidi->card, "USB MIDI",
2222                               umidi->next_midi_device++,
2223                               out_ports, in_ports, &rmidi);
2224         if (err < 0)
2225                 return err;
2226         strcpy(rmidi->name, umidi->card->shortname);
2227         rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
2228                             SNDRV_RAWMIDI_INFO_INPUT |
2229                             SNDRV_RAWMIDI_INFO_DUPLEX;
2230         rmidi->ops = &snd_usbmidi_ops;
2231         rmidi->private_data = umidi;
2232         rmidi->private_free = snd_usbmidi_rawmidi_free;
2233         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
2234                             &snd_usbmidi_output_ops);
2235         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
2236                             &snd_usbmidi_input_ops);
2237 
2238         umidi->rmidi = rmidi;
2239         return 0;
2240 }
2241 
2242 /*
2243  * Temporarily stop input.
2244  */
2245 void snd_usbmidi_input_stop(struct list_head *p)
2246 {
2247         struct snd_usb_midi *umidi;
2248         unsigned int i, j;
2249 
2250         umidi = list_entry(p, struct snd_usb_midi, list);
2251         if (!umidi->input_running)
2252                 return;
2253         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
2254                 struct snd_usb_midi_endpoint *ep = &umidi->endpoints[i];
2255                 if (ep->in)
2256                         for (j = 0; j < INPUT_URBS; ++j)
2257                                 usb_kill_urb(ep->in->urbs[j]);
2258         }
2259         umidi->input_running = 0;
2260 }
2261 EXPORT_SYMBOL(snd_usbmidi_input_stop);
2262 
2263 static void snd_usbmidi_input_start_ep(struct snd_usb_midi_in_endpoint *ep)
2264 {
2265         unsigned int i;
2266 
2267         if (!ep)
2268                 return;
2269         for (i = 0; i < INPUT_URBS; ++i) {
2270                 struct urb *urb = ep->urbs[i];
2271                 urb->dev = ep->umidi->dev;
2272                 snd_usbmidi_submit_urb(urb, GFP_KERNEL);
2273         }
2274 }
2275 
2276 /*
2277  * Resume input after a call to snd_usbmidi_input_stop().
2278  */
2279 void snd_usbmidi_input_start(struct list_head *p)
2280 {
2281         struct snd_usb_midi *umidi;
2282         int i;
2283 
2284         umidi = list_entry(p, struct snd_usb_midi, list);
2285         if (umidi->input_running || !umidi->opened[1])
2286                 return;
2287         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
2288                 snd_usbmidi_input_start_ep(umidi->endpoints[i].in);
2289         umidi->input_running = 1;
2290 }
2291 EXPORT_SYMBOL(snd_usbmidi_input_start);
2292 
2293 /*
2294  * Prepare for suspend. Typically called from the USB suspend callback.
2295  */
2296 void snd_usbmidi_suspend(struct list_head *p)
2297 {
2298         struct snd_usb_midi *umidi;
2299 
2300         umidi = list_entry(p, struct snd_usb_midi, list);
2301         mutex_lock(&umidi->mutex);
2302         snd_usbmidi_input_stop(p);
2303         mutex_unlock(&umidi->mutex);
2304 }
2305 EXPORT_SYMBOL(snd_usbmidi_suspend);
2306 
2307 /*
2308  * Resume. Typically called from the USB resume callback.
2309  */
2310 void snd_usbmidi_resume(struct list_head *p)
2311 {
2312         struct snd_usb_midi *umidi;
2313 
2314         umidi = list_entry(p, struct snd_usb_midi, list);
2315         mutex_lock(&umidi->mutex);
2316         snd_usbmidi_input_start(p);
2317         mutex_unlock(&umidi->mutex);
2318 }
2319 EXPORT_SYMBOL(snd_usbmidi_resume);
2320 
2321 /*
2322  * Creates and registers everything needed for a MIDI streaming interface.
2323  */
2324 int __snd_usbmidi_create(struct snd_card *card,
2325                          struct usb_interface *iface,
2326                          struct list_head *midi_list,
2327                          const struct snd_usb_audio_quirk *quirk,
2328                          unsigned int usb_id)
2329 {
2330         struct snd_usb_midi *umidi;
2331         struct snd_usb_midi_endpoint_info endpoints[MIDI_MAX_ENDPOINTS];
2332         int out_ports, in_ports;
2333         int i, err;
2334 
2335         umidi = kzalloc(sizeof(*umidi), GFP_KERNEL);
2336         if (!umidi)
2337                 return -ENOMEM;
2338         umidi->dev = interface_to_usbdev(iface);
2339         umidi->card = card;
2340         umidi->iface = iface;
2341         umidi->quirk = quirk;
2342         umidi->usb_protocol_ops = &snd_usbmidi_standard_ops;
2343         spin_lock_init(&umidi->disc_lock);
2344         init_rwsem(&umidi->disc_rwsem);
2345         mutex_init(&umidi->mutex);
2346         if (!usb_id)
2347                 usb_id = USB_ID(le16_to_cpu(umidi->dev->descriptor.idVendor),
2348                                le16_to_cpu(umidi->dev->descriptor.idProduct));
2349         umidi->usb_id = usb_id;
2350         setup_timer(&umidi->error_timer, snd_usbmidi_error_timer,
2351                     (unsigned long)umidi);
2352 
2353         /* detect the endpoint(s) to use */
2354         memset(endpoints, 0, sizeof(endpoints));
2355         switch (quirk ? quirk->type : QUIRK_MIDI_STANDARD_INTERFACE) {
2356         case QUIRK_MIDI_STANDARD_INTERFACE:
2357                 err = snd_usbmidi_get_ms_info(umidi, endpoints);
2358                 if (umidi->usb_id == USB_ID(0x0763, 0x0150)) /* M-Audio Uno */
2359                         umidi->usb_protocol_ops =
2360                                 &snd_usbmidi_maudio_broken_running_status_ops;
2361                 break;
2362         case QUIRK_MIDI_US122L:
2363                 umidi->usb_protocol_ops = &snd_usbmidi_122l_ops;
2364                 /* fall through */
2365         case QUIRK_MIDI_FIXED_ENDPOINT:
2366                 memcpy(&endpoints[0], quirk->data,
2367                        sizeof(struct snd_usb_midi_endpoint_info));
2368                 err = snd_usbmidi_detect_endpoints(umidi, &endpoints[0], 1);
2369                 break;
2370         case QUIRK_MIDI_YAMAHA:
2371                 err = snd_usbmidi_detect_yamaha(umidi, &endpoints[0]);
2372                 break;
2373         case QUIRK_MIDI_ROLAND:
2374                 err = snd_usbmidi_detect_roland(umidi, &endpoints[0]);
2375                 break;
2376         case QUIRK_MIDI_MIDIMAN:
2377                 umidi->usb_protocol_ops = &snd_usbmidi_midiman_ops;
2378                 memcpy(&endpoints[0], quirk->data,
2379                        sizeof(struct snd_usb_midi_endpoint_info));
2380                 err = 0;
2381                 break;
2382         case QUIRK_MIDI_NOVATION:
2383                 umidi->usb_protocol_ops = &snd_usbmidi_novation_ops;
2384                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2385                 break;
2386         case QUIRK_MIDI_RAW_BYTES:
2387                 umidi->usb_protocol_ops = &snd_usbmidi_raw_ops;
2388                 /*
2389                  * Interface 1 contains isochronous endpoints, but with the same
2390                  * numbers as in interface 0.  Since it is interface 1 that the
2391                  * USB core has most recently seen, these descriptors are now
2392                  * associated with the endpoint numbers.  This will foul up our
2393                  * attempts to submit bulk/interrupt URBs to the endpoints in
2394                  * interface 0, so we have to make sure that the USB core looks
2395                  * again at interface 0 by calling usb_set_interface() on it.
2396                  */
2397                 if (umidi->usb_id == USB_ID(0x07fd, 0x0001)) /* MOTU Fastlane */
2398                         usb_set_interface(umidi->dev, 0, 0);
2399                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2400                 break;
2401         case QUIRK_MIDI_EMAGIC:
2402                 umidi->usb_protocol_ops = &snd_usbmidi_emagic_ops;
2403                 memcpy(&endpoints[0], quirk->data,
2404                        sizeof(struct snd_usb_midi_endpoint_info));
2405                 err = snd_usbmidi_detect_endpoints(umidi, &endpoints[0], 1);
2406                 break;
2407         case QUIRK_MIDI_CME:
2408                 umidi->usb_protocol_ops = &snd_usbmidi_cme_ops;
2409                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2410                 break;
2411         case QUIRK_MIDI_AKAI:
2412                 umidi->usb_protocol_ops = &snd_usbmidi_akai_ops;
2413                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2414                 /* endpoint 1 is input-only */
2415                 endpoints[1].out_cables = 0;
2416                 break;
2417         case QUIRK_MIDI_FTDI:
2418                 umidi->usb_protocol_ops = &snd_usbmidi_ftdi_ops;
2419 
2420                 /* set baud rate to 31250 (48 MHz / 16 / 96) */
2421                 err = usb_control_msg(umidi->dev, usb_sndctrlpipe(umidi->dev, 0),
2422                                       3, 0x40, 0x60, 0, NULL, 0, 1000);
2423                 if (err < 0)
2424                         break;
2425 
2426                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2427                 break;
2428         case QUIRK_MIDI_CH345:
2429                 umidi->usb_protocol_ops = &snd_usbmidi_ch345_broken_sysex_ops;
2430                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2431                 break;
2432         default:
2433                 dev_err(&umidi->dev->dev, "invalid quirk type %d\n",
2434                         quirk->type);
2435                 err = -ENXIO;
2436                 break;
2437         }
2438         if (err < 0) {
2439                 kfree(umidi);
2440                 return err;
2441         }
2442 
2443         /* create rawmidi device */
2444         out_ports = 0;
2445         in_ports = 0;
2446         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
2447                 out_ports += hweight16(endpoints[i].out_cables);
2448                 in_ports += hweight16(endpoints[i].in_cables);
2449         }
2450         err = snd_usbmidi_create_rawmidi(umidi, out_ports, in_ports);
2451         if (err < 0) {
2452                 kfree(umidi);
2453                 return err;
2454         }
2455 
2456         /* create endpoint/port structures */
2457         if (quirk && quirk->type == QUIRK_MIDI_MIDIMAN)
2458                 err = snd_usbmidi_create_endpoints_midiman(umidi, &endpoints[0]);
2459         else
2460                 err = snd_usbmidi_create_endpoints(umidi, endpoints);
2461         if (err < 0) {
2462                 return err;
2463         }
2464 
2465         usb_autopm_get_interface_no_resume(umidi->iface);
2466 
2467         list_add_tail(&umidi->list, midi_list);
2468         return 0;
2469 }
2470 EXPORT_SYMBOL(__snd_usbmidi_create);
2471 

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