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TOMOYO Linux Cross Reference
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(KERN_CONT " %02x", *data);
246         printk(KERN_CONT " ]\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         unsigned long flags;
285 
286         spin_lock_irqsave(&ep->buffer_lock, flags);
287         urb_index = context - ep->urbs;
288         ep->active_urbs &= ~(1 << urb_index);
289         if (unlikely(ep->drain_urbs)) {
290                 ep->drain_urbs &= ~(1 << urb_index);
291                 wake_up(&ep->drain_wait);
292         }
293         spin_unlock_irqrestore(&ep->buffer_lock, flags);
294         if (urb->status < 0) {
295                 int err = snd_usbmidi_urb_error(urb);
296                 if (err < 0) {
297                         if (err != -ENODEV)
298                                 mod_timer(&ep->umidi->error_timer,
299                                           jiffies + ERROR_DELAY_JIFFIES);
300                         return;
301                 }
302         }
303         snd_usbmidi_do_output(ep);
304 }
305 
306 /*
307  * This is called when some data should be transferred to the device
308  * (from one or more substreams).
309  */
310 static void snd_usbmidi_do_output(struct snd_usb_midi_out_endpoint *ep)
311 {
312         unsigned int urb_index;
313         struct urb *urb;
314         unsigned long flags;
315 
316         spin_lock_irqsave(&ep->buffer_lock, flags);
317         if (ep->umidi->disconnected) {
318                 spin_unlock_irqrestore(&ep->buffer_lock, flags);
319                 return;
320         }
321 
322         urb_index = ep->next_urb;
323         for (;;) {
324                 if (!(ep->active_urbs & (1 << urb_index))) {
325                         urb = ep->urbs[urb_index].urb;
326                         urb->transfer_buffer_length = 0;
327                         ep->umidi->usb_protocol_ops->output(ep, urb);
328                         if (urb->transfer_buffer_length == 0)
329                                 break;
330 
331                         dump_urb("sending", urb->transfer_buffer,
332                                  urb->transfer_buffer_length);
333                         urb->dev = ep->umidi->dev;
334                         if (snd_usbmidi_submit_urb(urb, GFP_ATOMIC) < 0)
335                                 break;
336                         ep->active_urbs |= 1 << urb_index;
337                 }
338                 if (++urb_index >= OUTPUT_URBS)
339                         urb_index = 0;
340                 if (urb_index == ep->next_urb)
341                         break;
342         }
343         ep->next_urb = urb_index;
344         spin_unlock_irqrestore(&ep->buffer_lock, flags);
345 }
346 
347 static void snd_usbmidi_out_tasklet(unsigned long data)
348 {
349         struct snd_usb_midi_out_endpoint *ep =
350                 (struct snd_usb_midi_out_endpoint *) data;
351 
352         snd_usbmidi_do_output(ep);
353 }
354 
355 /* called after transfers had been interrupted due to some USB error */
356 static void snd_usbmidi_error_timer(struct timer_list *t)
357 {
358         struct snd_usb_midi *umidi = from_timer(umidi, t, error_timer);
359         unsigned int i, j;
360 
361         spin_lock(&umidi->disc_lock);
362         if (umidi->disconnected) {
363                 spin_unlock(&umidi->disc_lock);
364                 return;
365         }
366         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
367                 struct snd_usb_midi_in_endpoint *in = umidi->endpoints[i].in;
368                 if (in && in->error_resubmit) {
369                         in->error_resubmit = 0;
370                         for (j = 0; j < INPUT_URBS; ++j) {
371                                 if (atomic_read(&in->urbs[j]->use_count))
372                                         continue;
373                                 in->urbs[j]->dev = umidi->dev;
374                                 snd_usbmidi_submit_urb(in->urbs[j], GFP_ATOMIC);
375                         }
376                 }
377                 if (umidi->endpoints[i].out)
378                         snd_usbmidi_do_output(umidi->endpoints[i].out);
379         }
380         spin_unlock(&umidi->disc_lock);
381 }
382 
383 /* helper function to send static data that may not DMA-able */
384 static int send_bulk_static_data(struct snd_usb_midi_out_endpoint *ep,
385                                  const void *data, int len)
386 {
387         int err = 0;
388         void *buf = kmemdup(data, len, GFP_KERNEL);
389         if (!buf)
390                 return -ENOMEM;
391         dump_urb("sending", buf, len);
392         if (ep->urbs[0].urb)
393                 err = usb_bulk_msg(ep->umidi->dev, ep->urbs[0].urb->pipe,
394                                    buf, len, NULL, 250);
395         kfree(buf);
396         return err;
397 }
398 
399 /*
400  * Standard USB MIDI protocol: see the spec.
401  * Midiman protocol: like the standard protocol, but the control byte is the
402  * fourth byte in each packet, and uses length instead of CIN.
403  */
404 
405 static void snd_usbmidi_standard_input(struct snd_usb_midi_in_endpoint *ep,
406                                        uint8_t *buffer, int buffer_length)
407 {
408         int i;
409 
410         for (i = 0; i + 3 < buffer_length; i += 4)
411                 if (buffer[i] != 0) {
412                         int cable = buffer[i] >> 4;
413                         int length = snd_usbmidi_cin_length[buffer[i] & 0x0f];
414                         snd_usbmidi_input_data(ep, cable, &buffer[i + 1],
415                                                length);
416                 }
417 }
418 
419 static void snd_usbmidi_midiman_input(struct snd_usb_midi_in_endpoint *ep,
420                                       uint8_t *buffer, int buffer_length)
421 {
422         int i;
423 
424         for (i = 0; i + 3 < buffer_length; i += 4)
425                 if (buffer[i + 3] != 0) {
426                         int port = buffer[i + 3] >> 4;
427                         int length = buffer[i + 3] & 3;
428                         snd_usbmidi_input_data(ep, port, &buffer[i], length);
429                 }
430 }
431 
432 /*
433  * Buggy M-Audio device: running status on input results in a packet that has
434  * the data bytes but not the status byte and that is marked with CIN 4.
435  */
436 static void snd_usbmidi_maudio_broken_running_status_input(
437                                         struct snd_usb_midi_in_endpoint *ep,
438                                         uint8_t *buffer, int buffer_length)
439 {
440         int i;
441 
442         for (i = 0; i + 3 < buffer_length; i += 4)
443                 if (buffer[i] != 0) {
444                         int cable = buffer[i] >> 4;
445                         u8 cin = buffer[i] & 0x0f;
446                         struct usbmidi_in_port *port = &ep->ports[cable];
447                         int length;
448 
449                         length = snd_usbmidi_cin_length[cin];
450                         if (cin == 0xf && buffer[i + 1] >= 0xf8)
451                                 ; /* realtime msg: no running status change */
452                         else if (cin >= 0x8 && cin <= 0xe)
453                                 /* channel msg */
454                                 port->running_status_length = length - 1;
455                         else if (cin == 0x4 &&
456                                  port->running_status_length != 0 &&
457                                  buffer[i + 1] < 0x80)
458                                 /* CIN 4 that is not a SysEx */
459                                 length = port->running_status_length;
460                         else
461                                 /*
462                                  * All other msgs cannot begin running status.
463                                  * (A channel msg sent as two or three CIN 0xF
464                                  * packets could in theory, but this device
465                                  * doesn't use this format.)
466                                  */
467                                 port->running_status_length = 0;
468                         snd_usbmidi_input_data(ep, cable, &buffer[i + 1],
469                                                length);
470                 }
471 }
472 
473 /*
474  * QinHeng CH345 is buggy: every second packet inside a SysEx has not CIN 4
475  * but the previously seen CIN, but still with three data bytes.
476  */
477 static void ch345_broken_sysex_input(struct snd_usb_midi_in_endpoint *ep,
478                                      uint8_t *buffer, int buffer_length)
479 {
480         unsigned int i, cin, length;
481 
482         for (i = 0; i + 3 < buffer_length; i += 4) {
483                 if (buffer[i] == 0 && i > 0)
484                         break;
485                 cin = buffer[i] & 0x0f;
486                 if (ep->in_sysex &&
487                     cin == ep->last_cin &&
488                     (buffer[i + 1 + (cin == 0x6)] & 0x80) == 0)
489                         cin = 0x4;
490 #if 0
491                 if (buffer[i + 1] == 0x90) {
492                         /*
493                          * Either a corrupted running status or a real note-on
494                          * message; impossible to detect reliably.
495                          */
496                 }
497 #endif
498                 length = snd_usbmidi_cin_length[cin];
499                 snd_usbmidi_input_data(ep, 0, &buffer[i + 1], length);
500                 ep->in_sysex = cin == 0x4;
501                 if (!ep->in_sysex)
502                         ep->last_cin = cin;
503         }
504 }
505 
506 /*
507  * CME protocol: like the standard protocol, but SysEx commands are sent as a
508  * single USB packet preceded by a 0x0F byte.
509  */
510 static void snd_usbmidi_cme_input(struct snd_usb_midi_in_endpoint *ep,
511                                   uint8_t *buffer, int buffer_length)
512 {
513         if (buffer_length < 2 || (buffer[0] & 0x0f) != 0x0f)
514                 snd_usbmidi_standard_input(ep, buffer, buffer_length);
515         else
516                 snd_usbmidi_input_data(ep, buffer[0] >> 4,
517                                        &buffer[1], buffer_length - 1);
518 }
519 
520 /*
521  * Adds one USB MIDI packet to the output buffer.
522  */
523 static void snd_usbmidi_output_standard_packet(struct urb *urb, uint8_t p0,
524                                                uint8_t p1, uint8_t p2,
525                                                uint8_t p3)
526 {
527 
528         uint8_t *buf =
529                 (uint8_t *)urb->transfer_buffer + urb->transfer_buffer_length;
530         buf[0] = p0;
531         buf[1] = p1;
532         buf[2] = p2;
533         buf[3] = p3;
534         urb->transfer_buffer_length += 4;
535 }
536 
537 /*
538  * Adds one Midiman packet to the output buffer.
539  */
540 static void snd_usbmidi_output_midiman_packet(struct urb *urb, uint8_t p0,
541                                               uint8_t p1, uint8_t p2,
542                                               uint8_t p3)
543 {
544 
545         uint8_t *buf =
546                 (uint8_t *)urb->transfer_buffer + urb->transfer_buffer_length;
547         buf[0] = p1;
548         buf[1] = p2;
549         buf[2] = p3;
550         buf[3] = (p0 & 0xf0) | snd_usbmidi_cin_length[p0 & 0x0f];
551         urb->transfer_buffer_length += 4;
552 }
553 
554 /*
555  * Converts MIDI commands to USB MIDI packets.
556  */
557 static void snd_usbmidi_transmit_byte(struct usbmidi_out_port *port,
558                                       uint8_t b, struct urb *urb)
559 {
560         uint8_t p0 = port->cable;
561         void (*output_packet)(struct urb*, uint8_t, uint8_t, uint8_t, uint8_t) =
562                 port->ep->umidi->usb_protocol_ops->output_packet;
563 
564         if (b >= 0xf8) {
565                 output_packet(urb, p0 | 0x0f, b, 0, 0);
566         } else if (b >= 0xf0) {
567                 switch (b) {
568                 case 0xf0:
569                         port->data[0] = b;
570                         port->state = STATE_SYSEX_1;
571                         break;
572                 case 0xf1:
573                 case 0xf3:
574                         port->data[0] = b;
575                         port->state = STATE_1PARAM;
576                         break;
577                 case 0xf2:
578                         port->data[0] = b;
579                         port->state = STATE_2PARAM_1;
580                         break;
581                 case 0xf4:
582                 case 0xf5:
583                         port->state = STATE_UNKNOWN;
584                         break;
585                 case 0xf6:
586                         output_packet(urb, p0 | 0x05, 0xf6, 0, 0);
587                         port->state = STATE_UNKNOWN;
588                         break;
589                 case 0xf7:
590                         switch (port->state) {
591                         case STATE_SYSEX_0:
592                                 output_packet(urb, p0 | 0x05, 0xf7, 0, 0);
593                                 break;
594                         case STATE_SYSEX_1:
595                                 output_packet(urb, p0 | 0x06, port->data[0],
596                                               0xf7, 0);
597                                 break;
598                         case STATE_SYSEX_2:
599                                 output_packet(urb, p0 | 0x07, port->data[0],
600                                               port->data[1], 0xf7);
601                                 break;
602                         }
603                         port->state = STATE_UNKNOWN;
604                         break;
605                 }
606         } else if (b >= 0x80) {
607                 port->data[0] = b;
608                 if (b >= 0xc0 && b <= 0xdf)
609                         port->state = STATE_1PARAM;
610                 else
611                         port->state = STATE_2PARAM_1;
612         } else { /* b < 0x80 */
613                 switch (port->state) {
614                 case STATE_1PARAM:
615                         if (port->data[0] < 0xf0) {
616                                 p0 |= port->data[0] >> 4;
617                         } else {
618                                 p0 |= 0x02;
619                                 port->state = STATE_UNKNOWN;
620                         }
621                         output_packet(urb, p0, port->data[0], b, 0);
622                         break;
623                 case STATE_2PARAM_1:
624                         port->data[1] = b;
625                         port->state = STATE_2PARAM_2;
626                         break;
627                 case STATE_2PARAM_2:
628                         if (port->data[0] < 0xf0) {
629                                 p0 |= port->data[0] >> 4;
630                                 port->state = STATE_2PARAM_1;
631                         } else {
632                                 p0 |= 0x03;
633                                 port->state = STATE_UNKNOWN;
634                         }
635                         output_packet(urb, p0, port->data[0], port->data[1], b);
636                         break;
637                 case STATE_SYSEX_0:
638                         port->data[0] = b;
639                         port->state = STATE_SYSEX_1;
640                         break;
641                 case STATE_SYSEX_1:
642                         port->data[1] = b;
643                         port->state = STATE_SYSEX_2;
644                         break;
645                 case STATE_SYSEX_2:
646                         output_packet(urb, p0 | 0x04, port->data[0],
647                                       port->data[1], b);
648                         port->state = STATE_SYSEX_0;
649                         break;
650                 }
651         }
652 }
653 
654 static void snd_usbmidi_standard_output(struct snd_usb_midi_out_endpoint *ep,
655                                         struct urb *urb)
656 {
657         int p;
658 
659         /* FIXME: lower-numbered ports can starve higher-numbered ports */
660         for (p = 0; p < 0x10; ++p) {
661                 struct usbmidi_out_port *port = &ep->ports[p];
662                 if (!port->active)
663                         continue;
664                 while (urb->transfer_buffer_length + 3 < ep->max_transfer) {
665                         uint8_t b;
666                         if (snd_rawmidi_transmit(port->substream, &b, 1) != 1) {
667                                 port->active = 0;
668                                 break;
669                         }
670                         snd_usbmidi_transmit_byte(port, b, urb);
671                 }
672         }
673 }
674 
675 static const struct usb_protocol_ops snd_usbmidi_standard_ops = {
676         .input = snd_usbmidi_standard_input,
677         .output = snd_usbmidi_standard_output,
678         .output_packet = snd_usbmidi_output_standard_packet,
679 };
680 
681 static const struct usb_protocol_ops snd_usbmidi_midiman_ops = {
682         .input = snd_usbmidi_midiman_input,
683         .output = snd_usbmidi_standard_output,
684         .output_packet = snd_usbmidi_output_midiman_packet,
685 };
686 
687 static const
688 struct usb_protocol_ops snd_usbmidi_maudio_broken_running_status_ops = {
689         .input = snd_usbmidi_maudio_broken_running_status_input,
690         .output = snd_usbmidi_standard_output,
691         .output_packet = snd_usbmidi_output_standard_packet,
692 };
693 
694 static const struct usb_protocol_ops snd_usbmidi_cme_ops = {
695         .input = snd_usbmidi_cme_input,
696         .output = snd_usbmidi_standard_output,
697         .output_packet = snd_usbmidi_output_standard_packet,
698 };
699 
700 static const struct usb_protocol_ops snd_usbmidi_ch345_broken_sysex_ops = {
701         .input = ch345_broken_sysex_input,
702         .output = snd_usbmidi_standard_output,
703         .output_packet = snd_usbmidi_output_standard_packet,
704 };
705 
706 /*
707  * AKAI MPD16 protocol:
708  *
709  * For control port (endpoint 1):
710  * ==============================
711  * One or more chunks consisting of first byte of (0x10 | msg_len) and then a
712  * SysEx message (msg_len=9 bytes long).
713  *
714  * For data port (endpoint 2):
715  * ===========================
716  * One or more chunks consisting of first byte of (0x20 | msg_len) and then a
717  * MIDI message (msg_len bytes long)
718  *
719  * Messages sent: Active Sense, Note On, Poly Pressure, Control Change.
720  */
721 static void snd_usbmidi_akai_input(struct snd_usb_midi_in_endpoint *ep,
722                                    uint8_t *buffer, int buffer_length)
723 {
724         unsigned int pos = 0;
725         unsigned int len = (unsigned int)buffer_length;
726         while (pos < len) {
727                 unsigned int port = (buffer[pos] >> 4) - 1;
728                 unsigned int msg_len = buffer[pos] & 0x0f;
729                 pos++;
730                 if (pos + msg_len <= len && port < 2)
731                         snd_usbmidi_input_data(ep, 0, &buffer[pos], msg_len);
732                 pos += msg_len;
733         }
734 }
735 
736 #define MAX_AKAI_SYSEX_LEN 9
737 
738 static void snd_usbmidi_akai_output(struct snd_usb_midi_out_endpoint *ep,
739                                     struct urb *urb)
740 {
741         uint8_t *msg;
742         int pos, end, count, buf_end;
743         uint8_t tmp[MAX_AKAI_SYSEX_LEN];
744         struct snd_rawmidi_substream *substream = ep->ports[0].substream;
745 
746         if (!ep->ports[0].active)
747                 return;
748 
749         msg = urb->transfer_buffer + urb->transfer_buffer_length;
750         buf_end = ep->max_transfer - MAX_AKAI_SYSEX_LEN - 1;
751 
752         /* only try adding more data when there's space for at least 1 SysEx */
753         while (urb->transfer_buffer_length < buf_end) {
754                 count = snd_rawmidi_transmit_peek(substream,
755                                                   tmp, MAX_AKAI_SYSEX_LEN);
756                 if (!count) {
757                         ep->ports[0].active = 0;
758                         return;
759                 }
760                 /* try to skip non-SysEx data */
761                 for (pos = 0; pos < count && tmp[pos] != 0xF0; pos++)
762                         ;
763 
764                 if (pos > 0) {
765                         snd_rawmidi_transmit_ack(substream, pos);
766                         continue;
767                 }
768 
769                 /* look for the start or end marker */
770                 for (end = 1; end < count && tmp[end] < 0xF0; end++)
771                         ;
772 
773                 /* next SysEx started before the end of current one */
774                 if (end < count && tmp[end] == 0xF0) {
775                         /* it's incomplete - drop it */
776                         snd_rawmidi_transmit_ack(substream, end);
777                         continue;
778                 }
779                 /* SysEx complete */
780                 if (end < count && tmp[end] == 0xF7) {
781                         /* queue it, ack it, and get the next one */
782                         count = end + 1;
783                         msg[0] = 0x10 | count;
784                         memcpy(&msg[1], tmp, count);
785                         snd_rawmidi_transmit_ack(substream, count);
786                         urb->transfer_buffer_length += count + 1;
787                         msg += count + 1;
788                         continue;
789                 }
790                 /* less than 9 bytes and no end byte - wait for more */
791                 if (count < MAX_AKAI_SYSEX_LEN) {
792                         ep->ports[0].active = 0;
793                         return;
794                 }
795                 /* 9 bytes and no end marker in sight - malformed, skip it */
796                 snd_rawmidi_transmit_ack(substream, count);
797         }
798 }
799 
800 static const struct usb_protocol_ops snd_usbmidi_akai_ops = {
801         .input = snd_usbmidi_akai_input,
802         .output = snd_usbmidi_akai_output,
803 };
804 
805 /*
806  * Novation USB MIDI protocol: number of data bytes is in the first byte
807  * (when receiving) (+1!) or in the second byte (when sending); data begins
808  * at the third byte.
809  */
810 
811 static void snd_usbmidi_novation_input(struct snd_usb_midi_in_endpoint *ep,
812                                        uint8_t *buffer, int buffer_length)
813 {
814         if (buffer_length < 2 || !buffer[0] || buffer_length < buffer[0] + 1)
815                 return;
816         snd_usbmidi_input_data(ep, 0, &buffer[2], buffer[0] - 1);
817 }
818 
819 static void snd_usbmidi_novation_output(struct snd_usb_midi_out_endpoint *ep,
820                                         struct urb *urb)
821 {
822         uint8_t *transfer_buffer;
823         int count;
824 
825         if (!ep->ports[0].active)
826                 return;
827         transfer_buffer = urb->transfer_buffer;
828         count = snd_rawmidi_transmit(ep->ports[0].substream,
829                                      &transfer_buffer[2],
830                                      ep->max_transfer - 2);
831         if (count < 1) {
832                 ep->ports[0].active = 0;
833                 return;
834         }
835         transfer_buffer[0] = 0;
836         transfer_buffer[1] = count;
837         urb->transfer_buffer_length = 2 + count;
838 }
839 
840 static const struct usb_protocol_ops snd_usbmidi_novation_ops = {
841         .input = snd_usbmidi_novation_input,
842         .output = snd_usbmidi_novation_output,
843 };
844 
845 /*
846  * "raw" protocol: just move raw MIDI bytes from/to the endpoint
847  */
848 
849 static void snd_usbmidi_raw_input(struct snd_usb_midi_in_endpoint *ep,
850                                   uint8_t *buffer, int buffer_length)
851 {
852         snd_usbmidi_input_data(ep, 0, buffer, buffer_length);
853 }
854 
855 static void snd_usbmidi_raw_output(struct snd_usb_midi_out_endpoint *ep,
856                                    struct urb *urb)
857 {
858         int count;
859 
860         if (!ep->ports[0].active)
861                 return;
862         count = snd_rawmidi_transmit(ep->ports[0].substream,
863                                      urb->transfer_buffer,
864                                      ep->max_transfer);
865         if (count < 1) {
866                 ep->ports[0].active = 0;
867                 return;
868         }
869         urb->transfer_buffer_length = count;
870 }
871 
872 static const struct usb_protocol_ops snd_usbmidi_raw_ops = {
873         .input = snd_usbmidi_raw_input,
874         .output = snd_usbmidi_raw_output,
875 };
876 
877 /*
878  * FTDI protocol: raw MIDI bytes, but input packets have two modem status bytes.
879  */
880 
881 static void snd_usbmidi_ftdi_input(struct snd_usb_midi_in_endpoint *ep,
882                                    uint8_t *buffer, int buffer_length)
883 {
884         if (buffer_length > 2)
885                 snd_usbmidi_input_data(ep, 0, buffer + 2, buffer_length - 2);
886 }
887 
888 static const struct usb_protocol_ops snd_usbmidi_ftdi_ops = {
889         .input = snd_usbmidi_ftdi_input,
890         .output = snd_usbmidi_raw_output,
891 };
892 
893 static void snd_usbmidi_us122l_input(struct snd_usb_midi_in_endpoint *ep,
894                                      uint8_t *buffer, int buffer_length)
895 {
896         if (buffer_length != 9)
897                 return;
898         buffer_length = 8;
899         while (buffer_length && buffer[buffer_length - 1] == 0xFD)
900                 buffer_length--;
901         if (buffer_length)
902                 snd_usbmidi_input_data(ep, 0, buffer, buffer_length);
903 }
904 
905 static void snd_usbmidi_us122l_output(struct snd_usb_midi_out_endpoint *ep,
906                                       struct urb *urb)
907 {
908         int count;
909 
910         if (!ep->ports[0].active)
911                 return;
912         switch (snd_usb_get_speed(ep->umidi->dev)) {
913         case USB_SPEED_HIGH:
914         case USB_SPEED_SUPER:
915         case USB_SPEED_SUPER_PLUS:
916                 count = 1;
917                 break;
918         default:
919                 count = 2;
920         }
921         count = snd_rawmidi_transmit(ep->ports[0].substream,
922                                      urb->transfer_buffer,
923                                      count);
924         if (count < 1) {
925                 ep->ports[0].active = 0;
926                 return;
927         }
928 
929         memset(urb->transfer_buffer + count, 0xFD, ep->max_transfer - count);
930         urb->transfer_buffer_length = ep->max_transfer;
931 }
932 
933 static const struct usb_protocol_ops snd_usbmidi_122l_ops = {
934         .input = snd_usbmidi_us122l_input,
935         .output = snd_usbmidi_us122l_output,
936 };
937 
938 /*
939  * Emagic USB MIDI protocol: raw MIDI with "F5 xx" port switching.
940  */
941 
942 static void snd_usbmidi_emagic_init_out(struct snd_usb_midi_out_endpoint *ep)
943 {
944         static const u8 init_data[] = {
945                 /* initialization magic: "get version" */
946                 0xf0,
947                 0x00, 0x20, 0x31,       /* Emagic */
948                 0x64,                   /* Unitor8 */
949                 0x0b,                   /* version number request */
950                 0x00,                   /* command version */
951                 0x00,                   /* EEPROM, box 0 */
952                 0xf7
953         };
954         send_bulk_static_data(ep, init_data, sizeof(init_data));
955         /* while we're at it, pour on more magic */
956         send_bulk_static_data(ep, init_data, sizeof(init_data));
957 }
958 
959 static void snd_usbmidi_emagic_finish_out(struct snd_usb_midi_out_endpoint *ep)
960 {
961         static const u8 finish_data[] = {
962                 /* switch to patch mode with last preset */
963                 0xf0,
964                 0x00, 0x20, 0x31,       /* Emagic */
965                 0x64,                   /* Unitor8 */
966                 0x10,                   /* patch switch command */
967                 0x00,                   /* command version */
968                 0x7f,                   /* to all boxes */
969                 0x40,                   /* last preset in EEPROM */
970                 0xf7
971         };
972         send_bulk_static_data(ep, finish_data, sizeof(finish_data));
973 }
974 
975 static void snd_usbmidi_emagic_input(struct snd_usb_midi_in_endpoint *ep,
976                                      uint8_t *buffer, int buffer_length)
977 {
978         int i;
979 
980         /* FF indicates end of valid data */
981         for (i = 0; i < buffer_length; ++i)
982                 if (buffer[i] == 0xff) {
983                         buffer_length = i;
984                         break;
985                 }
986 
987         /* handle F5 at end of last buffer */
988         if (ep->seen_f5)
989                 goto switch_port;
990 
991         while (buffer_length > 0) {
992                 /* determine size of data until next F5 */
993                 for (i = 0; i < buffer_length; ++i)
994                         if (buffer[i] == 0xf5)
995                                 break;
996                 snd_usbmidi_input_data(ep, ep->current_port, buffer, i);
997                 buffer += i;
998                 buffer_length -= i;
999 
1000                 if (buffer_length <= 0)
1001                         break;
1002                 /* assert(buffer[0] == 0xf5); */
1003                 ep->seen_f5 = 1;
1004                 ++buffer;
1005                 --buffer_length;
1006 
1007         switch_port:
1008                 if (buffer_length <= 0)
1009                         break;
1010                 if (buffer[0] < 0x80) {
1011                         ep->current_port = (buffer[0] - 1) & 15;
1012                         ++buffer;
1013                         --buffer_length;
1014                 }
1015                 ep->seen_f5 = 0;
1016         }
1017 }
1018 
1019 static void snd_usbmidi_emagic_output(struct snd_usb_midi_out_endpoint *ep,
1020                                       struct urb *urb)
1021 {
1022         int port0 = ep->current_port;
1023         uint8_t *buf = urb->transfer_buffer;
1024         int buf_free = ep->max_transfer;
1025         int length, i;
1026 
1027         for (i = 0; i < 0x10; ++i) {
1028                 /* round-robin, starting at the last current port */
1029                 int portnum = (port0 + i) & 15;
1030                 struct usbmidi_out_port *port = &ep->ports[portnum];
1031 
1032                 if (!port->active)
1033                         continue;
1034                 if (snd_rawmidi_transmit_peek(port->substream, buf, 1) != 1) {
1035                         port->active = 0;
1036                         continue;
1037                 }
1038 
1039                 if (portnum != ep->current_port) {
1040                         if (buf_free < 2)
1041                                 break;
1042                         ep->current_port = portnum;
1043                         buf[0] = 0xf5;
1044                         buf[1] = (portnum + 1) & 15;
1045                         buf += 2;
1046                         buf_free -= 2;
1047                 }
1048 
1049                 if (buf_free < 1)
1050                         break;
1051                 length = snd_rawmidi_transmit(port->substream, buf, buf_free);
1052                 if (length > 0) {
1053                         buf += length;
1054                         buf_free -= length;
1055                         if (buf_free < 1)
1056                                 break;
1057                 }
1058         }
1059         if (buf_free < ep->max_transfer && buf_free > 0) {
1060                 *buf = 0xff;
1061                 --buf_free;
1062         }
1063         urb->transfer_buffer_length = ep->max_transfer - buf_free;
1064 }
1065 
1066 static const struct usb_protocol_ops snd_usbmidi_emagic_ops = {
1067         .input = snd_usbmidi_emagic_input,
1068         .output = snd_usbmidi_emagic_output,
1069         .init_out_endpoint = snd_usbmidi_emagic_init_out,
1070         .finish_out_endpoint = snd_usbmidi_emagic_finish_out,
1071 };
1072 
1073 
1074 static void update_roland_altsetting(struct snd_usb_midi *umidi)
1075 {
1076         struct usb_interface *intf;
1077         struct usb_host_interface *hostif;
1078         struct usb_interface_descriptor *intfd;
1079         int is_light_load;
1080 
1081         intf = umidi->iface;
1082         is_light_load = intf->cur_altsetting != intf->altsetting;
1083         if (umidi->roland_load_ctl->private_value == is_light_load)
1084                 return;
1085         hostif = &intf->altsetting[umidi->roland_load_ctl->private_value];
1086         intfd = get_iface_desc(hostif);
1087         snd_usbmidi_input_stop(&umidi->list);
1088         usb_set_interface(umidi->dev, intfd->bInterfaceNumber,
1089                           intfd->bAlternateSetting);
1090         snd_usbmidi_input_start(&umidi->list);
1091 }
1092 
1093 static int substream_open(struct snd_rawmidi_substream *substream, int dir,
1094                           int open)
1095 {
1096         struct snd_usb_midi *umidi = substream->rmidi->private_data;
1097         struct snd_kcontrol *ctl;
1098 
1099         down_read(&umidi->disc_rwsem);
1100         if (umidi->disconnected) {
1101                 up_read(&umidi->disc_rwsem);
1102                 return open ? -ENODEV : 0;
1103         }
1104 
1105         mutex_lock(&umidi->mutex);
1106         if (open) {
1107                 if (!umidi->opened[0] && !umidi->opened[1]) {
1108                         if (umidi->roland_load_ctl) {
1109                                 ctl = umidi->roland_load_ctl;
1110                                 ctl->vd[0].access |=
1111                                         SNDRV_CTL_ELEM_ACCESS_INACTIVE;
1112                                 snd_ctl_notify(umidi->card,
1113                                        SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
1114                                 update_roland_altsetting(umidi);
1115                         }
1116                 }
1117                 umidi->opened[dir]++;
1118                 if (umidi->opened[1])
1119                         snd_usbmidi_input_start(&umidi->list);
1120         } else {
1121                 umidi->opened[dir]--;
1122                 if (!umidi->opened[1])
1123                         snd_usbmidi_input_stop(&umidi->list);
1124                 if (!umidi->opened[0] && !umidi->opened[1]) {
1125                         if (umidi->roland_load_ctl) {
1126                                 ctl = umidi->roland_load_ctl;
1127                                 ctl->vd[0].access &=
1128                                         ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
1129                                 snd_ctl_notify(umidi->card,
1130                                        SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
1131                         }
1132                 }
1133         }
1134         mutex_unlock(&umidi->mutex);
1135         up_read(&umidi->disc_rwsem);
1136         return 0;
1137 }
1138 
1139 static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
1140 {
1141         struct snd_usb_midi *umidi = substream->rmidi->private_data;
1142         struct usbmidi_out_port *port = NULL;
1143         int i, j;
1144 
1145         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
1146                 if (umidi->endpoints[i].out)
1147                         for (j = 0; j < 0x10; ++j)
1148                                 if (umidi->endpoints[i].out->ports[j].substream == substream) {
1149                                         port = &umidi->endpoints[i].out->ports[j];
1150                                         break;
1151                                 }
1152         if (!port) {
1153                 snd_BUG();
1154                 return -ENXIO;
1155         }
1156 
1157         substream->runtime->private_data = port;
1158         port->state = STATE_UNKNOWN;
1159         return substream_open(substream, 0, 1);
1160 }
1161 
1162 static int snd_usbmidi_output_close(struct snd_rawmidi_substream *substream)
1163 {
1164         return substream_open(substream, 0, 0);
1165 }
1166 
1167 static void snd_usbmidi_output_trigger(struct snd_rawmidi_substream *substream,
1168                                        int up)
1169 {
1170         struct usbmidi_out_port *port =
1171                 (struct usbmidi_out_port *)substream->runtime->private_data;
1172 
1173         port->active = up;
1174         if (up) {
1175                 if (port->ep->umidi->disconnected) {
1176                         /* gobble up remaining bytes to prevent wait in
1177                          * snd_rawmidi_drain_output */
1178                         snd_rawmidi_proceed(substream);
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         int err;
1286 
1287         rep->in = NULL;
1288         ep = kzalloc(sizeof(*ep), GFP_KERNEL);
1289         if (!ep)
1290                 return -ENOMEM;
1291         ep->umidi = umidi;
1292 
1293         for (i = 0; i < INPUT_URBS; ++i) {
1294                 ep->urbs[i] = usb_alloc_urb(0, GFP_KERNEL);
1295                 if (!ep->urbs[i]) {
1296                         err = -ENOMEM;
1297                         goto error;
1298                 }
1299         }
1300         if (ep_info->in_interval)
1301                 pipe = usb_rcvintpipe(umidi->dev, ep_info->in_ep);
1302         else
1303                 pipe = usb_rcvbulkpipe(umidi->dev, ep_info->in_ep);
1304         length = usb_maxpacket(umidi->dev, pipe, 0);
1305         for (i = 0; i < INPUT_URBS; ++i) {
1306                 buffer = usb_alloc_coherent(umidi->dev, length, GFP_KERNEL,
1307                                             &ep->urbs[i]->transfer_dma);
1308                 if (!buffer) {
1309                         err = -ENOMEM;
1310                         goto error;
1311                 }
1312                 if (ep_info->in_interval)
1313                         usb_fill_int_urb(ep->urbs[i], umidi->dev,
1314                                          pipe, buffer, length,
1315                                          snd_usbmidi_in_urb_complete,
1316                                          ep, ep_info->in_interval);
1317                 else
1318                         usb_fill_bulk_urb(ep->urbs[i], umidi->dev,
1319                                           pipe, buffer, length,
1320                                           snd_usbmidi_in_urb_complete, ep);
1321                 ep->urbs[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1322                 err = usb_urb_ep_type_check(ep->urbs[i]);
1323                 if (err < 0) {
1324                         dev_err(&umidi->dev->dev, "invalid MIDI in EP %x\n",
1325                                 ep_info->in_ep);
1326                         goto error;
1327                 }
1328         }
1329 
1330         rep->in = ep;
1331         return 0;
1332 
1333  error:
1334         snd_usbmidi_in_endpoint_delete(ep);
1335         return -ENOMEM;
1336 }
1337 
1338 /*
1339  * Frees an output endpoint.
1340  * May be called when ep hasn't been initialized completely.
1341  */
1342 static void snd_usbmidi_out_endpoint_clear(struct snd_usb_midi_out_endpoint *ep)
1343 {
1344         unsigned int i;
1345 
1346         for (i = 0; i < OUTPUT_URBS; ++i)
1347                 if (ep->urbs[i].urb) {
1348                         free_urb_and_buffer(ep->umidi, ep->urbs[i].urb,
1349                                             ep->max_transfer);
1350                         ep->urbs[i].urb = NULL;
1351                 }
1352 }
1353 
1354 static void snd_usbmidi_out_endpoint_delete(struct snd_usb_midi_out_endpoint *ep)
1355 {
1356         snd_usbmidi_out_endpoint_clear(ep);
1357         kfree(ep);
1358 }
1359 
1360 /*
1361  * Creates an output endpoint, and initializes output ports.
1362  */
1363 static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi *umidi,
1364                                            struct snd_usb_midi_endpoint_info *ep_info,
1365                                            struct snd_usb_midi_endpoint *rep)
1366 {
1367         struct snd_usb_midi_out_endpoint *ep;
1368         unsigned int i;
1369         unsigned int pipe;
1370         void *buffer;
1371         int err;
1372 
1373         rep->out = NULL;
1374         ep = kzalloc(sizeof(*ep), GFP_KERNEL);
1375         if (!ep)
1376                 return -ENOMEM;
1377         ep->umidi = umidi;
1378 
1379         for (i = 0; i < OUTPUT_URBS; ++i) {
1380                 ep->urbs[i].urb = usb_alloc_urb(0, GFP_KERNEL);
1381                 if (!ep->urbs[i].urb) {
1382                         err = -ENOMEM;
1383                         goto error;
1384                 }
1385                 ep->urbs[i].ep = ep;
1386         }
1387         if (ep_info->out_interval)
1388                 pipe = usb_sndintpipe(umidi->dev, ep_info->out_ep);
1389         else
1390                 pipe = usb_sndbulkpipe(umidi->dev, ep_info->out_ep);
1391         switch (umidi->usb_id) {
1392         default:
1393                 ep->max_transfer = usb_maxpacket(umidi->dev, pipe, 1);
1394                 break;
1395                 /*
1396                  * Various chips declare a packet size larger than 4 bytes, but
1397                  * do not actually work with larger packets:
1398                  */
1399         case USB_ID(0x0a67, 0x5011): /* Medeli DD305 */
1400         case USB_ID(0x0a92, 0x1020): /* ESI M4U */
1401         case USB_ID(0x1430, 0x474b): /* RedOctane GH MIDI INTERFACE */
1402         case USB_ID(0x15ca, 0x0101): /* Textech USB Midi Cable */
1403         case USB_ID(0x15ca, 0x1806): /* Textech USB Midi Cable */
1404         case USB_ID(0x1a86, 0x752d): /* QinHeng CH345 "USB2.0-MIDI" */
1405         case USB_ID(0xfc08, 0x0101): /* Unknown vendor Cable */
1406                 ep->max_transfer = 4;
1407                 break;
1408                 /*
1409                  * Some devices only work with 9 bytes packet size:
1410                  */
1411         case USB_ID(0x0644, 0x800E): /* Tascam US-122L */
1412         case USB_ID(0x0644, 0x800F): /* Tascam US-144 */
1413                 ep->max_transfer = 9;
1414                 break;
1415         }
1416         for (i = 0; i < OUTPUT_URBS; ++i) {
1417                 buffer = usb_alloc_coherent(umidi->dev,
1418                                             ep->max_transfer, GFP_KERNEL,
1419                                             &ep->urbs[i].urb->transfer_dma);
1420                 if (!buffer) {
1421                         err = -ENOMEM;
1422                         goto error;
1423                 }
1424                 if (ep_info->out_interval)
1425                         usb_fill_int_urb(ep->urbs[i].urb, umidi->dev,
1426                                          pipe, buffer, ep->max_transfer,
1427                                          snd_usbmidi_out_urb_complete,
1428                                          &ep->urbs[i], ep_info->out_interval);
1429                 else
1430                         usb_fill_bulk_urb(ep->urbs[i].urb, umidi->dev,
1431                                           pipe, buffer, ep->max_transfer,
1432                                           snd_usbmidi_out_urb_complete,
1433                                           &ep->urbs[i]);
1434                 err = usb_urb_ep_type_check(ep->urbs[i].urb);
1435                 if (err < 0) {
1436                         dev_err(&umidi->dev->dev, "invalid MIDI out EP %x\n",
1437                                 ep_info->out_ep);
1438                         goto error;
1439                 }
1440                 ep->urbs[i].urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1441         }
1442 
1443         spin_lock_init(&ep->buffer_lock);
1444         tasklet_init(&ep->tasklet, snd_usbmidi_out_tasklet, (unsigned long)ep);
1445         init_waitqueue_head(&ep->drain_wait);
1446 
1447         for (i = 0; i < 0x10; ++i)
1448                 if (ep_info->out_cables & (1 << i)) {
1449                         ep->ports[i].ep = ep;
1450                         ep->ports[i].cable = i << 4;
1451                 }
1452 
1453         if (umidi->usb_protocol_ops->init_out_endpoint)
1454                 umidi->usb_protocol_ops->init_out_endpoint(ep);
1455 
1456         rep->out = ep;
1457         return 0;
1458 
1459  error:
1460         snd_usbmidi_out_endpoint_delete(ep);
1461         return err;
1462 }
1463 
1464 /*
1465  * Frees everything.
1466  */
1467 static void snd_usbmidi_free(struct snd_usb_midi *umidi)
1468 {
1469         int i;
1470 
1471         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1472                 struct snd_usb_midi_endpoint *ep = &umidi->endpoints[i];
1473                 if (ep->out)
1474                         snd_usbmidi_out_endpoint_delete(ep->out);
1475                 if (ep->in)
1476                         snd_usbmidi_in_endpoint_delete(ep->in);
1477         }
1478         mutex_destroy(&umidi->mutex);
1479         kfree(umidi);
1480 }
1481 
1482 /*
1483  * Unlinks all URBs (must be done before the usb_device is deleted).
1484  */
1485 void snd_usbmidi_disconnect(struct list_head *p)
1486 {
1487         struct snd_usb_midi *umidi;
1488         unsigned int i, j;
1489 
1490         umidi = list_entry(p, struct snd_usb_midi, list);
1491         /*
1492          * an URB's completion handler may start the timer and
1493          * a timer may submit an URB. To reliably break the cycle
1494          * a flag under lock must be used
1495          */
1496         down_write(&umidi->disc_rwsem);
1497         spin_lock_irq(&umidi->disc_lock);
1498         umidi->disconnected = 1;
1499         spin_unlock_irq(&umidi->disc_lock);
1500         up_write(&umidi->disc_rwsem);
1501 
1502         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1503                 struct snd_usb_midi_endpoint *ep = &umidi->endpoints[i];
1504                 if (ep->out)
1505                         tasklet_kill(&ep->out->tasklet);
1506                 if (ep->out) {
1507                         for (j = 0; j < OUTPUT_URBS; ++j)
1508                                 usb_kill_urb(ep->out->urbs[j].urb);
1509                         if (umidi->usb_protocol_ops->finish_out_endpoint)
1510                                 umidi->usb_protocol_ops->finish_out_endpoint(ep->out);
1511                         ep->out->active_urbs = 0;
1512                         if (ep->out->drain_urbs) {
1513                                 ep->out->drain_urbs = 0;
1514                                 wake_up(&ep->out->drain_wait);
1515                         }
1516                 }
1517                 if (ep->in)
1518                         for (j = 0; j < INPUT_URBS; ++j)
1519                                 usb_kill_urb(ep->in->urbs[j]);
1520                 /* free endpoints here; later call can result in Oops */
1521                 if (ep->out)
1522                         snd_usbmidi_out_endpoint_clear(ep->out);
1523                 if (ep->in) {
1524                         snd_usbmidi_in_endpoint_delete(ep->in);
1525                         ep->in = NULL;
1526                 }
1527         }
1528         del_timer_sync(&umidi->error_timer);
1529 }
1530 EXPORT_SYMBOL(snd_usbmidi_disconnect);
1531 
1532 static void snd_usbmidi_rawmidi_free(struct snd_rawmidi *rmidi)
1533 {
1534         struct snd_usb_midi *umidi = rmidi->private_data;
1535         snd_usbmidi_free(umidi);
1536 }
1537 
1538 static struct snd_rawmidi_substream *snd_usbmidi_find_substream(struct snd_usb_midi *umidi,
1539                                                                 int stream,
1540                                                                 int number)
1541 {
1542         struct snd_rawmidi_substream *substream;
1543 
1544         list_for_each_entry(substream, &umidi->rmidi->streams[stream].substreams,
1545                             list) {
1546                 if (substream->number == number)
1547                         return substream;
1548         }
1549         return NULL;
1550 }
1551 
1552 /*
1553  * This list specifies names for ports that do not fit into the standard
1554  * "(product) MIDI (n)" schema because they aren't external MIDI ports,
1555  * such as internal control or synthesizer ports.
1556  */
1557 static struct port_info {
1558         u32 id;
1559         short int port;
1560         short int voices;
1561         const char *name;
1562         unsigned int seq_flags;
1563 } snd_usbmidi_port_info[] = {
1564 #define PORT_INFO(vendor, product, num, name_, voices_, flags) \
1565         { .id = USB_ID(vendor, product), \
1566           .port = num, .voices = voices_, \
1567           .name = name_, .seq_flags = flags }
1568 #define EXTERNAL_PORT(vendor, product, num, name) \
1569         PORT_INFO(vendor, product, num, name, 0, \
1570                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1571                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1572                   SNDRV_SEQ_PORT_TYPE_PORT)
1573 #define CONTROL_PORT(vendor, product, num, name) \
1574         PORT_INFO(vendor, product, num, name, 0, \
1575                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1576                   SNDRV_SEQ_PORT_TYPE_HARDWARE)
1577 #define GM_SYNTH_PORT(vendor, product, num, name, voices) \
1578         PORT_INFO(vendor, product, num, name, voices, \
1579                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1580                   SNDRV_SEQ_PORT_TYPE_MIDI_GM | \
1581                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1582                   SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
1583 #define ROLAND_SYNTH_PORT(vendor, product, num, name, voices) \
1584         PORT_INFO(vendor, product, num, name, voices, \
1585                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1586                   SNDRV_SEQ_PORT_TYPE_MIDI_GM | \
1587                   SNDRV_SEQ_PORT_TYPE_MIDI_GM2 | \
1588                   SNDRV_SEQ_PORT_TYPE_MIDI_GS | \
1589                   SNDRV_SEQ_PORT_TYPE_MIDI_XG | \
1590                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1591                   SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
1592 #define SOUNDCANVAS_PORT(vendor, product, num, name, voices) \
1593         PORT_INFO(vendor, product, num, name, voices, \
1594                   SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | \
1595                   SNDRV_SEQ_PORT_TYPE_MIDI_GM | \
1596                   SNDRV_SEQ_PORT_TYPE_MIDI_GM2 | \
1597                   SNDRV_SEQ_PORT_TYPE_MIDI_GS | \
1598                   SNDRV_SEQ_PORT_TYPE_MIDI_XG | \
1599                   SNDRV_SEQ_PORT_TYPE_MIDI_MT32 | \
1600                   SNDRV_SEQ_PORT_TYPE_HARDWARE | \
1601                   SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
1602         /* Yamaha MOTIF XF */
1603         GM_SYNTH_PORT(0x0499, 0x105c, 0, "%s Tone Generator", 128),
1604         CONTROL_PORT(0x0499, 0x105c, 1, "%s Remote Control"),
1605         EXTERNAL_PORT(0x0499, 0x105c, 2, "%s Thru"),
1606         CONTROL_PORT(0x0499, 0x105c, 3, "%s Editor"),
1607         /* Roland UA-100 */
1608         CONTROL_PORT(0x0582, 0x0000, 2, "%s Control"),
1609         /* Roland SC-8850 */
1610         SOUNDCANVAS_PORT(0x0582, 0x0003, 0, "%s Part A", 128),
1611         SOUNDCANVAS_PORT(0x0582, 0x0003, 1, "%s Part B", 128),
1612         SOUNDCANVAS_PORT(0x0582, 0x0003, 2, "%s Part C", 128),
1613         SOUNDCANVAS_PORT(0x0582, 0x0003, 3, "%s Part D", 128),
1614         EXTERNAL_PORT(0x0582, 0x0003, 4, "%s MIDI 1"),
1615         EXTERNAL_PORT(0x0582, 0x0003, 5, "%s MIDI 2"),
1616         /* Roland U-8 */
1617         EXTERNAL_PORT(0x0582, 0x0004, 0, "%s MIDI"),
1618         CONTROL_PORT(0x0582, 0x0004, 1, "%s Control"),
1619         /* Roland SC-8820 */
1620         SOUNDCANVAS_PORT(0x0582, 0x0007, 0, "%s Part A", 64),
1621         SOUNDCANVAS_PORT(0x0582, 0x0007, 1, "%s Part B", 64),
1622         EXTERNAL_PORT(0x0582, 0x0007, 2, "%s MIDI"),
1623         /* Roland SK-500 */
1624         SOUNDCANVAS_PORT(0x0582, 0x000b, 0, "%s Part A", 64),
1625         SOUNDCANVAS_PORT(0x0582, 0x000b, 1, "%s Part B", 64),
1626         EXTERNAL_PORT(0x0582, 0x000b, 2, "%s MIDI"),
1627         /* Roland SC-D70 */
1628         SOUNDCANVAS_PORT(0x0582, 0x000c, 0, "%s Part A", 64),
1629         SOUNDCANVAS_PORT(0x0582, 0x000c, 1, "%s Part B", 64),
1630         EXTERNAL_PORT(0x0582, 0x000c, 2, "%s MIDI"),
1631         /* Edirol UM-880 */
1632         CONTROL_PORT(0x0582, 0x0014, 8, "%s Control"),
1633         /* Edirol SD-90 */
1634         ROLAND_SYNTH_PORT(0x0582, 0x0016, 0, "%s Part A", 128),
1635         ROLAND_SYNTH_PORT(0x0582, 0x0016, 1, "%s Part B", 128),
1636         EXTERNAL_PORT(0x0582, 0x0016, 2, "%s MIDI 1"),
1637         EXTERNAL_PORT(0x0582, 0x0016, 3, "%s MIDI 2"),
1638         /* Edirol UM-550 */
1639         CONTROL_PORT(0x0582, 0x0023, 5, "%s Control"),
1640         /* Edirol SD-20 */
1641         ROLAND_SYNTH_PORT(0x0582, 0x0027, 0, "%s Part A", 64),
1642         ROLAND_SYNTH_PORT(0x0582, 0x0027, 1, "%s Part B", 64),
1643         EXTERNAL_PORT(0x0582, 0x0027, 2, "%s MIDI"),
1644         /* Edirol SD-80 */
1645         ROLAND_SYNTH_PORT(0x0582, 0x0029, 0, "%s Part A", 128),
1646         ROLAND_SYNTH_PORT(0x0582, 0x0029, 1, "%s Part B", 128),
1647         EXTERNAL_PORT(0x0582, 0x0029, 2, "%s MIDI 1"),
1648         EXTERNAL_PORT(0x0582, 0x0029, 3, "%s MIDI 2"),
1649         /* Edirol UA-700 */
1650         EXTERNAL_PORT(0x0582, 0x002b, 0, "%s MIDI"),
1651         CONTROL_PORT(0x0582, 0x002b, 1, "%s Control"),
1652         /* Roland VariOS */
1653         EXTERNAL_PORT(0x0582, 0x002f, 0, "%s MIDI"),
1654         EXTERNAL_PORT(0x0582, 0x002f, 1, "%s External MIDI"),
1655         EXTERNAL_PORT(0x0582, 0x002f, 2, "%s Sync"),
1656         /* Edirol PCR */
1657         EXTERNAL_PORT(0x0582, 0x0033, 0, "%s MIDI"),
1658         EXTERNAL_PORT(0x0582, 0x0033, 1, "%s 1"),
1659         EXTERNAL_PORT(0x0582, 0x0033, 2, "%s 2"),
1660         /* BOSS GS-10 */
1661         EXTERNAL_PORT(0x0582, 0x003b, 0, "%s MIDI"),
1662         CONTROL_PORT(0x0582, 0x003b, 1, "%s Control"),
1663         /* Edirol UA-1000 */
1664         EXTERNAL_PORT(0x0582, 0x0044, 0, "%s MIDI"),
1665         CONTROL_PORT(0x0582, 0x0044, 1, "%s Control"),
1666         /* Edirol UR-80 */
1667         EXTERNAL_PORT(0x0582, 0x0048, 0, "%s MIDI"),
1668         EXTERNAL_PORT(0x0582, 0x0048, 1, "%s 1"),
1669         EXTERNAL_PORT(0x0582, 0x0048, 2, "%s 2"),
1670         /* Edirol PCR-A */
1671         EXTERNAL_PORT(0x0582, 0x004d, 0, "%s MIDI"),
1672         EXTERNAL_PORT(0x0582, 0x004d, 1, "%s 1"),
1673         EXTERNAL_PORT(0x0582, 0x004d, 2, "%s 2"),
1674         /* BOSS GT-PRO */
1675         CONTROL_PORT(0x0582, 0x0089, 0, "%s Control"),
1676         /* Edirol UM-3EX */
1677         CONTROL_PORT(0x0582, 0x009a, 3, "%s Control"),
1678         /* Roland VG-99 */
1679         CONTROL_PORT(0x0582, 0x00b2, 0, "%s Control"),
1680         EXTERNAL_PORT(0x0582, 0x00b2, 1, "%s MIDI"),
1681         /* Cakewalk Sonar V-Studio 100 */
1682         EXTERNAL_PORT(0x0582, 0x00eb, 0, "%s MIDI"),
1683         CONTROL_PORT(0x0582, 0x00eb, 1, "%s Control"),
1684         /* Roland VB-99 */
1685         CONTROL_PORT(0x0582, 0x0102, 0, "%s Control"),
1686         EXTERNAL_PORT(0x0582, 0x0102, 1, "%s MIDI"),
1687         /* Roland A-PRO */
1688         EXTERNAL_PORT(0x0582, 0x010f, 0, "%s MIDI"),
1689         CONTROL_PORT(0x0582, 0x010f, 1, "%s 1"),
1690         CONTROL_PORT(0x0582, 0x010f, 2, "%s 2"),
1691         /* Roland SD-50 */
1692         ROLAND_SYNTH_PORT(0x0582, 0x0114, 0, "%s Synth", 128),
1693         EXTERNAL_PORT(0x0582, 0x0114, 1, "%s MIDI"),
1694         CONTROL_PORT(0x0582, 0x0114, 2, "%s Control"),
1695         /* Roland OCTA-CAPTURE */
1696         EXTERNAL_PORT(0x0582, 0x0120, 0, "%s MIDI"),
1697         CONTROL_PORT(0x0582, 0x0120, 1, "%s Control"),
1698         EXTERNAL_PORT(0x0582, 0x0121, 0, "%s MIDI"),
1699         CONTROL_PORT(0x0582, 0x0121, 1, "%s Control"),
1700         /* Roland SPD-SX */
1701         CONTROL_PORT(0x0582, 0x0145, 0, "%s Control"),
1702         EXTERNAL_PORT(0x0582, 0x0145, 1, "%s MIDI"),
1703         /* Roland A-Series */
1704         CONTROL_PORT(0x0582, 0x0156, 0, "%s Keyboard"),
1705         EXTERNAL_PORT(0x0582, 0x0156, 1, "%s MIDI"),
1706         /* Roland INTEGRA-7 */
1707         ROLAND_SYNTH_PORT(0x0582, 0x015b, 0, "%s Synth", 128),
1708         CONTROL_PORT(0x0582, 0x015b, 1, "%s Control"),
1709         /* M-Audio MidiSport 8x8 */
1710         CONTROL_PORT(0x0763, 0x1031, 8, "%s Control"),
1711         CONTROL_PORT(0x0763, 0x1033, 8, "%s Control"),
1712         /* MOTU Fastlane */
1713         EXTERNAL_PORT(0x07fd, 0x0001, 0, "%s MIDI A"),
1714         EXTERNAL_PORT(0x07fd, 0x0001, 1, "%s MIDI B"),
1715         /* Emagic Unitor8/AMT8/MT4 */
1716         EXTERNAL_PORT(0x086a, 0x0001, 8, "%s Broadcast"),
1717         EXTERNAL_PORT(0x086a, 0x0002, 8, "%s Broadcast"),
1718         EXTERNAL_PORT(0x086a, 0x0003, 4, "%s Broadcast"),
1719         /* Akai MPD16 */
1720         CONTROL_PORT(0x09e8, 0x0062, 0, "%s Control"),
1721         PORT_INFO(0x09e8, 0x0062, 1, "%s MIDI", 0,
1722                 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
1723                 SNDRV_SEQ_PORT_TYPE_HARDWARE),
1724         /* Access Music Virus TI */
1725         EXTERNAL_PORT(0x133e, 0x0815, 0, "%s MIDI"),
1726         PORT_INFO(0x133e, 0x0815, 1, "%s Synth", 0,
1727                 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
1728                 SNDRV_SEQ_PORT_TYPE_HARDWARE |
1729                 SNDRV_SEQ_PORT_TYPE_SYNTHESIZER),
1730 };
1731 
1732 static struct port_info *find_port_info(struct snd_usb_midi *umidi, int number)
1733 {
1734         int i;
1735 
1736         for (i = 0; i < ARRAY_SIZE(snd_usbmidi_port_info); ++i) {
1737                 if (snd_usbmidi_port_info[i].id == umidi->usb_id &&
1738                     snd_usbmidi_port_info[i].port == number)
1739                         return &snd_usbmidi_port_info[i];
1740         }
1741         return NULL;
1742 }
1743 
1744 static void snd_usbmidi_get_port_info(struct snd_rawmidi *rmidi, int number,
1745                                       struct snd_seq_port_info *seq_port_info)
1746 {
1747         struct snd_usb_midi *umidi = rmidi->private_data;
1748         struct port_info *port_info;
1749 
1750         /* TODO: read port flags from descriptors */
1751         port_info = find_port_info(umidi, number);
1752         if (port_info) {
1753                 seq_port_info->type = port_info->seq_flags;
1754                 seq_port_info->midi_voices = port_info->voices;
1755         }
1756 }
1757 
1758 static void snd_usbmidi_init_substream(struct snd_usb_midi *umidi,
1759                                        int stream, int number,
1760                                        struct snd_rawmidi_substream **rsubstream)
1761 {
1762         struct port_info *port_info;
1763         const char *name_format;
1764 
1765         struct snd_rawmidi_substream *substream =
1766                 snd_usbmidi_find_substream(umidi, stream, number);
1767         if (!substream) {
1768                 dev_err(&umidi->dev->dev, "substream %d:%d not found\n", stream,
1769                         number);
1770                 return;
1771         }
1772 
1773         /* TODO: read port name from jack descriptor */
1774         port_info = find_port_info(umidi, number);
1775         name_format = port_info ? port_info->name : "%s MIDI %d";
1776         snprintf(substream->name, sizeof(substream->name),
1777                  name_format, umidi->card->shortname, number + 1);
1778 
1779         *rsubstream = substream;
1780 }
1781 
1782 /*
1783  * Creates the endpoints and their ports.
1784  */
1785 static int snd_usbmidi_create_endpoints(struct snd_usb_midi *umidi,
1786                                         struct snd_usb_midi_endpoint_info *endpoints)
1787 {
1788         int i, j, err;
1789         int out_ports = 0, in_ports = 0;
1790 
1791         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
1792                 if (endpoints[i].out_cables) {
1793                         err = snd_usbmidi_out_endpoint_create(umidi,
1794                                                               &endpoints[i],
1795                                                               &umidi->endpoints[i]);
1796                         if (err < 0)
1797                                 return err;
1798                 }
1799                 if (endpoints[i].in_cables) {
1800                         err = snd_usbmidi_in_endpoint_create(umidi,
1801                                                              &endpoints[i],
1802                                                              &umidi->endpoints[i]);
1803                         if (err < 0)
1804                                 return err;
1805                 }
1806 
1807                 for (j = 0; j < 0x10; ++j) {
1808                         if (endpoints[i].out_cables & (1 << j)) {
1809                                 snd_usbmidi_init_substream(umidi,
1810                                                            SNDRV_RAWMIDI_STREAM_OUTPUT,
1811                                                            out_ports,
1812                                                            &umidi->endpoints[i].out->ports[j].substream);
1813                                 ++out_ports;
1814                         }
1815                         if (endpoints[i].in_cables & (1 << j)) {
1816                                 snd_usbmidi_init_substream(umidi,
1817                                                            SNDRV_RAWMIDI_STREAM_INPUT,
1818                                                            in_ports,
1819                                                            &umidi->endpoints[i].in->ports[j].substream);
1820                                 ++in_ports;
1821                         }
1822                 }
1823         }
1824         dev_dbg(&umidi->dev->dev, "created %d output and %d input ports\n",
1825                     out_ports, in_ports);
1826         return 0;
1827 }
1828 
1829 /*
1830  * Returns MIDIStreaming device capabilities.
1831  */
1832 static int snd_usbmidi_get_ms_info(struct snd_usb_midi *umidi,
1833                                    struct snd_usb_midi_endpoint_info *endpoints)
1834 {
1835         struct usb_interface *intf;
1836         struct usb_host_interface *hostif;
1837         struct usb_interface_descriptor *intfd;
1838         struct usb_ms_header_descriptor *ms_header;
1839         struct usb_host_endpoint *hostep;
1840         struct usb_endpoint_descriptor *ep;
1841         struct usb_ms_endpoint_descriptor *ms_ep;
1842         int i, epidx;
1843 
1844         intf = umidi->iface;
1845         if (!intf)
1846                 return -ENXIO;
1847         hostif = &intf->altsetting[0];
1848         intfd = get_iface_desc(hostif);
1849         ms_header = (struct usb_ms_header_descriptor *)hostif->extra;
1850         if (hostif->extralen >= 7 &&
1851             ms_header->bLength >= 7 &&
1852             ms_header->bDescriptorType == USB_DT_CS_INTERFACE &&
1853             ms_header->bDescriptorSubtype == UAC_HEADER)
1854                 dev_dbg(&umidi->dev->dev, "MIDIStreaming version %02x.%02x\n",
1855                             ms_header->bcdMSC[1], ms_header->bcdMSC[0]);
1856         else
1857                 dev_warn(&umidi->dev->dev,
1858                          "MIDIStreaming interface descriptor not found\n");
1859 
1860         epidx = 0;
1861         for (i = 0; i < intfd->bNumEndpoints; ++i) {
1862                 hostep = &hostif->endpoint[i];
1863                 ep = get_ep_desc(hostep);
1864                 if (!usb_endpoint_xfer_bulk(ep) && !usb_endpoint_xfer_int(ep))
1865                         continue;
1866                 ms_ep = (struct usb_ms_endpoint_descriptor *)hostep->extra;
1867                 if (hostep->extralen < 4 ||
1868                     ms_ep->bLength < 4 ||
1869                     ms_ep->bDescriptorType != USB_DT_CS_ENDPOINT ||
1870                     ms_ep->bDescriptorSubtype != UAC_MS_GENERAL)
1871                         continue;
1872                 if (usb_endpoint_dir_out(ep)) {
1873                         if (endpoints[epidx].out_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].out_ep = usb_endpoint_num(ep);
1881                         if (usb_endpoint_xfer_int(ep))
1882                                 endpoints[epidx].out_interval = ep->bInterval;
1883                         else if (snd_usb_get_speed(umidi->dev) == USB_SPEED_LOW)
1884                                 /*
1885                                  * Low speed bulk transfers don't exist, so
1886                                  * force interrupt transfers for devices like
1887                                  * ESI MIDI Mate that try to use them anyway.
1888                                  */
1889                                 endpoints[epidx].out_interval = 1;
1890                         endpoints[epidx].out_cables =
1891                                 (1 << ms_ep->bNumEmbMIDIJack) - 1;
1892                         dev_dbg(&umidi->dev->dev, "EP %02X: %d jack(s)\n",
1893                                 ep->bEndpointAddress, ms_ep->bNumEmbMIDIJack);
1894                 } else {
1895                         if (endpoints[epidx].in_ep) {
1896                                 if (++epidx >= MIDI_MAX_ENDPOINTS) {
1897                                         dev_warn(&umidi->dev->dev,
1898                                                  "too many endpoints\n");
1899                                         break;
1900                                 }
1901                         }
1902                         endpoints[epidx].in_ep = usb_endpoint_num(ep);
1903                         if (usb_endpoint_xfer_int(ep))
1904                                 endpoints[epidx].in_interval = ep->bInterval;
1905                         else if (snd_usb_get_speed(umidi->dev) == USB_SPEED_LOW)
1906                                 endpoints[epidx].in_interval = 1;
1907                         endpoints[epidx].in_cables =
1908                                 (1 << ms_ep->bNumEmbMIDIJack) - 1;
1909                         dev_dbg(&umidi->dev->dev, "EP %02X: %d jack(s)\n",
1910                                 ep->bEndpointAddress, ms_ep->bNumEmbMIDIJack);
1911                 }
1912         }
1913         return 0;
1914 }
1915 
1916 static int roland_load_info(struct snd_kcontrol *kcontrol,
1917                             struct snd_ctl_elem_info *info)
1918 {
1919         static const char *const names[] = { "High Load", "Light Load" };
1920 
1921         return snd_ctl_enum_info(info, 1, 2, names);
1922 }
1923 
1924 static int roland_load_get(struct snd_kcontrol *kcontrol,
1925                            struct snd_ctl_elem_value *value)
1926 {
1927         value->value.enumerated.item[0] = kcontrol->private_value;
1928         return 0;
1929 }
1930 
1931 static int roland_load_put(struct snd_kcontrol *kcontrol,
1932                            struct snd_ctl_elem_value *value)
1933 {
1934         struct snd_usb_midi *umidi = kcontrol->private_data;
1935         int changed;
1936 
1937         if (value->value.enumerated.item[0] > 1)
1938                 return -EINVAL;
1939         mutex_lock(&umidi->mutex);
1940         changed = value->value.enumerated.item[0] != kcontrol->private_value;
1941         if (changed)
1942                 kcontrol->private_value = value->value.enumerated.item[0];
1943         mutex_unlock(&umidi->mutex);
1944         return changed;
1945 }
1946 
1947 static const struct snd_kcontrol_new roland_load_ctl = {
1948         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1949         .name = "MIDI Input Mode",
1950         .info = roland_load_info,
1951         .get = roland_load_get,
1952         .put = roland_load_put,
1953         .private_value = 1,
1954 };
1955 
1956 /*
1957  * On Roland devices, use the second alternate setting to be able to use
1958  * the interrupt input endpoint.
1959  */
1960 static void snd_usbmidi_switch_roland_altsetting(struct snd_usb_midi *umidi)
1961 {
1962         struct usb_interface *intf;
1963         struct usb_host_interface *hostif;
1964         struct usb_interface_descriptor *intfd;
1965 
1966         intf = umidi->iface;
1967         if (!intf || intf->num_altsetting != 2)
1968                 return;
1969 
1970         hostif = &intf->altsetting[1];
1971         intfd = get_iface_desc(hostif);
1972        /* If either or both of the endpoints support interrupt transfer,
1973         * then use the alternate setting
1974         */
1975         if (intfd->bNumEndpoints != 2 ||
1976             !((get_endpoint(hostif, 0)->bmAttributes &
1977                USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT ||
1978               (get_endpoint(hostif, 1)->bmAttributes &
1979                USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT))
1980                 return;
1981 
1982         dev_dbg(&umidi->dev->dev, "switching to altsetting %d with int ep\n",
1983                     intfd->bAlternateSetting);
1984         usb_set_interface(umidi->dev, intfd->bInterfaceNumber,
1985                           intfd->bAlternateSetting);
1986 
1987         umidi->roland_load_ctl = snd_ctl_new1(&roland_load_ctl, umidi);
1988         if (snd_ctl_add(umidi->card, umidi->roland_load_ctl) < 0)
1989                 umidi->roland_load_ctl = NULL;
1990 }
1991 
1992 /*
1993  * Try to find any usable endpoints in the interface.
1994  */
1995 static int snd_usbmidi_detect_endpoints(struct snd_usb_midi *umidi,
1996                                         struct snd_usb_midi_endpoint_info *endpoint,
1997                                         int max_endpoints)
1998 {
1999         struct usb_interface *intf;
2000         struct usb_host_interface *hostif;
2001         struct usb_interface_descriptor *intfd;
2002         struct usb_endpoint_descriptor *epd;
2003         int i, out_eps = 0, in_eps = 0;
2004 
2005         if (USB_ID_VENDOR(umidi->usb_id) == 0x0582)
2006                 snd_usbmidi_switch_roland_altsetting(umidi);
2007 
2008         if (endpoint[0].out_ep || endpoint[0].in_ep)
2009                 return 0;
2010 
2011         intf = umidi->iface;
2012         if (!intf || intf->num_altsetting < 1)
2013                 return -ENOENT;
2014         hostif = intf->cur_altsetting;
2015         intfd = get_iface_desc(hostif);
2016 
2017         for (i = 0; i < intfd->bNumEndpoints; ++i) {
2018                 epd = get_endpoint(hostif, i);
2019                 if (!usb_endpoint_xfer_bulk(epd) &&
2020                     !usb_endpoint_xfer_int(epd))
2021                         continue;
2022                 if (out_eps < max_endpoints &&
2023                     usb_endpoint_dir_out(epd)) {
2024                         endpoint[out_eps].out_ep = usb_endpoint_num(epd);
2025                         if (usb_endpoint_xfer_int(epd))
2026                                 endpoint[out_eps].out_interval = epd->bInterval;
2027                         ++out_eps;
2028                 }
2029                 if (in_eps < max_endpoints &&
2030                     usb_endpoint_dir_in(epd)) {
2031                         endpoint[in_eps].in_ep = usb_endpoint_num(epd);
2032                         if (usb_endpoint_xfer_int(epd))
2033                                 endpoint[in_eps].in_interval = epd->bInterval;
2034                         ++in_eps;
2035                 }
2036         }
2037         return (out_eps || in_eps) ? 0 : -ENOENT;
2038 }
2039 
2040 /*
2041  * Detects the endpoints for one-port-per-endpoint protocols.
2042  */
2043 static int snd_usbmidi_detect_per_port_endpoints(struct snd_usb_midi *umidi,
2044                                                  struct snd_usb_midi_endpoint_info *endpoints)
2045 {
2046         int err, i;
2047 
2048         err = snd_usbmidi_detect_endpoints(umidi, endpoints, MIDI_MAX_ENDPOINTS);
2049         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
2050                 if (endpoints[i].out_ep)
2051                         endpoints[i].out_cables = 0x0001;
2052                 if (endpoints[i].in_ep)
2053                         endpoints[i].in_cables = 0x0001;
2054         }
2055         return err;
2056 }
2057 
2058 /*
2059  * Detects the endpoints and ports of Yamaha devices.
2060  */
2061 static int snd_usbmidi_detect_yamaha(struct snd_usb_midi *umidi,
2062                                      struct snd_usb_midi_endpoint_info *endpoint)
2063 {
2064         struct usb_interface *intf;
2065         struct usb_host_interface *hostif;
2066         struct usb_interface_descriptor *intfd;
2067         uint8_t *cs_desc;
2068 
2069         intf = umidi->iface;
2070         if (!intf)
2071                 return -ENOENT;
2072         hostif = intf->altsetting;
2073         intfd = get_iface_desc(hostif);
2074         if (intfd->bNumEndpoints < 1)
2075                 return -ENOENT;
2076 
2077         /*
2078          * For each port there is one MIDI_IN/OUT_JACK descriptor, not
2079          * necessarily with any useful contents.  So simply count 'em.
2080          */
2081         for (cs_desc = hostif->extra;
2082              cs_desc < hostif->extra + hostif->extralen && cs_desc[0] >= 2;
2083              cs_desc += cs_desc[0]) {
2084                 if (cs_desc[1] == USB_DT_CS_INTERFACE) {
2085                         if (cs_desc[2] == UAC_MIDI_IN_JACK)
2086                                 endpoint->in_cables =
2087                                         (endpoint->in_cables << 1) | 1;
2088                         else if (cs_desc[2] == UAC_MIDI_OUT_JACK)
2089                                 endpoint->out_cables =
2090                                         (endpoint->out_cables << 1) | 1;
2091                 }
2092         }
2093         if (!endpoint->in_cables && !endpoint->out_cables)
2094                 return -ENOENT;
2095 
2096         return snd_usbmidi_detect_endpoints(umidi, endpoint, 1);
2097 }
2098 
2099 /*
2100  * Detects the endpoints and ports of Roland devices.
2101  */
2102 static int snd_usbmidi_detect_roland(struct snd_usb_midi *umidi,
2103                                      struct snd_usb_midi_endpoint_info *endpoint)
2104 {
2105         struct usb_interface *intf;
2106         struct usb_host_interface *hostif;
2107         u8 *cs_desc;
2108 
2109         intf = umidi->iface;
2110         if (!intf)
2111                 return -ENOENT;
2112         hostif = intf->altsetting;
2113         /*
2114          * Some devices have a descriptor <06 24 F1 02 <inputs> <outputs>>,
2115          * some have standard class descriptors, or both kinds, or neither.
2116          */
2117         for (cs_desc = hostif->extra;
2118              cs_desc < hostif->extra + hostif->extralen && cs_desc[0] >= 2;
2119              cs_desc += cs_desc[0]) {
2120                 if (cs_desc[0] >= 6 &&
2121                     cs_desc[1] == USB_DT_CS_INTERFACE &&
2122                     cs_desc[2] == 0xf1 &&
2123                     cs_desc[3] == 0x02) {
2124                         endpoint->in_cables  = (1 << cs_desc[4]) - 1;
2125                         endpoint->out_cables = (1 << cs_desc[5]) - 1;
2126                         return snd_usbmidi_detect_endpoints(umidi, endpoint, 1);
2127                 } else if (cs_desc[0] >= 7 &&
2128                            cs_desc[1] == USB_DT_CS_INTERFACE &&
2129                            cs_desc[2] == UAC_HEADER) {
2130                         return snd_usbmidi_get_ms_info(umidi, endpoint);
2131                 }
2132         }
2133 
2134         return -ENODEV;
2135 }
2136 
2137 /*
2138  * Creates the endpoints and their ports for Midiman devices.
2139  */
2140 static int snd_usbmidi_create_endpoints_midiman(struct snd_usb_midi *umidi,
2141                                                 struct snd_usb_midi_endpoint_info *endpoint)
2142 {
2143         struct snd_usb_midi_endpoint_info ep_info;
2144         struct usb_interface *intf;
2145         struct usb_host_interface *hostif;
2146         struct usb_interface_descriptor *intfd;
2147         struct usb_endpoint_descriptor *epd;
2148         int cable, err;
2149 
2150         intf = umidi->iface;
2151         if (!intf)
2152                 return -ENOENT;
2153         hostif = intf->altsetting;
2154         intfd = get_iface_desc(hostif);
2155         /*
2156          * The various MidiSport devices have more or less random endpoint
2157          * numbers, so we have to identify the endpoints by their index in
2158          * the descriptor array, like the driver for that other OS does.
2159          *
2160          * There is one interrupt input endpoint for all input ports, one
2161          * bulk output endpoint for even-numbered ports, and one for odd-
2162          * numbered ports.  Both bulk output endpoints have corresponding
2163          * input bulk endpoints (at indices 1 and 3) which aren't used.
2164          */
2165         if (intfd->bNumEndpoints < (endpoint->out_cables > 0x0001 ? 5 : 3)) {
2166                 dev_dbg(&umidi->dev->dev, "not enough endpoints\n");
2167                 return -ENOENT;
2168         }
2169 
2170         epd = get_endpoint(hostif, 0);
2171         if (!usb_endpoint_dir_in(epd) || !usb_endpoint_xfer_int(epd)) {
2172                 dev_dbg(&umidi->dev->dev, "endpoint[0] isn't interrupt\n");
2173                 return -ENXIO;
2174         }
2175         epd = get_endpoint(hostif, 2);
2176         if (!usb_endpoint_dir_out(epd) || !usb_endpoint_xfer_bulk(epd)) {
2177                 dev_dbg(&umidi->dev->dev, "endpoint[2] isn't bulk output\n");
2178                 return -ENXIO;
2179         }
2180         if (endpoint->out_cables > 0x0001) {
2181                 epd = get_endpoint(hostif, 4);
2182                 if (!usb_endpoint_dir_out(epd) ||
2183                     !usb_endpoint_xfer_bulk(epd)) {
2184                         dev_dbg(&umidi->dev->dev,
2185                                 "endpoint[4] isn't bulk output\n");
2186                         return -ENXIO;
2187                 }
2188         }
2189 
2190         ep_info.out_ep = get_endpoint(hostif, 2)->bEndpointAddress &
2191                 USB_ENDPOINT_NUMBER_MASK;
2192         ep_info.out_interval = 0;
2193         ep_info.out_cables = endpoint->out_cables & 0x5555;
2194         err = snd_usbmidi_out_endpoint_create(umidi, &ep_info,
2195                                               &umidi->endpoints[0]);
2196         if (err < 0)
2197                 return err;
2198 
2199         ep_info.in_ep = get_endpoint(hostif, 0)->bEndpointAddress &
2200                 USB_ENDPOINT_NUMBER_MASK;
2201         ep_info.in_interval = get_endpoint(hostif, 0)->bInterval;
2202         ep_info.in_cables = endpoint->in_cables;
2203         err = snd_usbmidi_in_endpoint_create(umidi, &ep_info,
2204                                              &umidi->endpoints[0]);
2205         if (err < 0)
2206                 return err;
2207 
2208         if (endpoint->out_cables > 0x0001) {
2209                 ep_info.out_ep = get_endpoint(hostif, 4)->bEndpointAddress &
2210                         USB_ENDPOINT_NUMBER_MASK;
2211                 ep_info.out_cables = endpoint->out_cables & 0xaaaa;
2212                 err = snd_usbmidi_out_endpoint_create(umidi, &ep_info,
2213                                                       &umidi->endpoints[1]);
2214                 if (err < 0)
2215                         return err;
2216         }
2217 
2218         for (cable = 0; cable < 0x10; ++cable) {
2219                 if (endpoint->out_cables & (1 << cable))
2220                         snd_usbmidi_init_substream(umidi,
2221                                                    SNDRV_RAWMIDI_STREAM_OUTPUT,
2222                                                    cable,
2223                                                    &umidi->endpoints[cable & 1].out->ports[cable].substream);
2224                 if (endpoint->in_cables & (1 << cable))
2225                         snd_usbmidi_init_substream(umidi,
2226                                                    SNDRV_RAWMIDI_STREAM_INPUT,
2227                                                    cable,
2228                                                    &umidi->endpoints[0].in->ports[cable].substream);
2229         }
2230         return 0;
2231 }
2232 
2233 static const struct snd_rawmidi_global_ops snd_usbmidi_ops = {
2234         .get_port_info = snd_usbmidi_get_port_info,
2235 };
2236 
2237 static int snd_usbmidi_create_rawmidi(struct snd_usb_midi *umidi,
2238                                       int out_ports, int in_ports)
2239 {
2240         struct snd_rawmidi *rmidi;
2241         int err;
2242 
2243         err = snd_rawmidi_new(umidi->card, "USB MIDI",
2244                               umidi->next_midi_device++,
2245                               out_ports, in_ports, &rmidi);
2246         if (err < 0)
2247                 return err;
2248         strcpy(rmidi->name, umidi->card->shortname);
2249         rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
2250                             SNDRV_RAWMIDI_INFO_INPUT |
2251                             SNDRV_RAWMIDI_INFO_DUPLEX;
2252         rmidi->ops = &snd_usbmidi_ops;
2253         rmidi->private_data = umidi;
2254         rmidi->private_free = snd_usbmidi_rawmidi_free;
2255         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
2256                             &snd_usbmidi_output_ops);
2257         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
2258                             &snd_usbmidi_input_ops);
2259 
2260         umidi->rmidi = rmidi;
2261         return 0;
2262 }
2263 
2264 /*
2265  * Temporarily stop input.
2266  */
2267 void snd_usbmidi_input_stop(struct list_head *p)
2268 {
2269         struct snd_usb_midi *umidi;
2270         unsigned int i, j;
2271 
2272         umidi = list_entry(p, struct snd_usb_midi, list);
2273         if (!umidi->input_running)
2274                 return;
2275         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
2276                 struct snd_usb_midi_endpoint *ep = &umidi->endpoints[i];
2277                 if (ep->in)
2278                         for (j = 0; j < INPUT_URBS; ++j)
2279                                 usb_kill_urb(ep->in->urbs[j]);
2280         }
2281         umidi->input_running = 0;
2282 }
2283 EXPORT_SYMBOL(snd_usbmidi_input_stop);
2284 
2285 static void snd_usbmidi_input_start_ep(struct snd_usb_midi_in_endpoint *ep)
2286 {
2287         unsigned int i;
2288 
2289         if (!ep)
2290                 return;
2291         for (i = 0; i < INPUT_URBS; ++i) {
2292                 struct urb *urb = ep->urbs[i];
2293                 urb->dev = ep->umidi->dev;
2294                 snd_usbmidi_submit_urb(urb, GFP_KERNEL);
2295         }
2296 }
2297 
2298 /*
2299  * Resume input after a call to snd_usbmidi_input_stop().
2300  */
2301 void snd_usbmidi_input_start(struct list_head *p)
2302 {
2303         struct snd_usb_midi *umidi;
2304         int i;
2305 
2306         umidi = list_entry(p, struct snd_usb_midi, list);
2307         if (umidi->input_running || !umidi->opened[1])
2308                 return;
2309         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
2310                 snd_usbmidi_input_start_ep(umidi->endpoints[i].in);
2311         umidi->input_running = 1;
2312 }
2313 EXPORT_SYMBOL(snd_usbmidi_input_start);
2314 
2315 /*
2316  * Prepare for suspend. Typically called from the USB suspend callback.
2317  */
2318 void snd_usbmidi_suspend(struct list_head *p)
2319 {
2320         struct snd_usb_midi *umidi;
2321 
2322         umidi = list_entry(p, struct snd_usb_midi, list);
2323         mutex_lock(&umidi->mutex);
2324         snd_usbmidi_input_stop(p);
2325         mutex_unlock(&umidi->mutex);
2326 }
2327 EXPORT_SYMBOL(snd_usbmidi_suspend);
2328 
2329 /*
2330  * Resume. Typically called from the USB resume callback.
2331  */
2332 void snd_usbmidi_resume(struct list_head *p)
2333 {
2334         struct snd_usb_midi *umidi;
2335 
2336         umidi = list_entry(p, struct snd_usb_midi, list);
2337         mutex_lock(&umidi->mutex);
2338         snd_usbmidi_input_start(p);
2339         mutex_unlock(&umidi->mutex);
2340 }
2341 EXPORT_SYMBOL(snd_usbmidi_resume);
2342 
2343 /*
2344  * Creates and registers everything needed for a MIDI streaming interface.
2345  */
2346 int __snd_usbmidi_create(struct snd_card *card,
2347                          struct usb_interface *iface,
2348                          struct list_head *midi_list,
2349                          const struct snd_usb_audio_quirk *quirk,
2350                          unsigned int usb_id)
2351 {
2352         struct snd_usb_midi *umidi;
2353         struct snd_usb_midi_endpoint_info endpoints[MIDI_MAX_ENDPOINTS];
2354         int out_ports, in_ports;
2355         int i, err;
2356 
2357         umidi = kzalloc(sizeof(*umidi), GFP_KERNEL);
2358         if (!umidi)
2359                 return -ENOMEM;
2360         umidi->dev = interface_to_usbdev(iface);
2361         umidi->card = card;
2362         umidi->iface = iface;
2363         umidi->quirk = quirk;
2364         umidi->usb_protocol_ops = &snd_usbmidi_standard_ops;
2365         spin_lock_init(&umidi->disc_lock);
2366         init_rwsem(&umidi->disc_rwsem);
2367         mutex_init(&umidi->mutex);
2368         if (!usb_id)
2369                 usb_id = USB_ID(le16_to_cpu(umidi->dev->descriptor.idVendor),
2370                                le16_to_cpu(umidi->dev->descriptor.idProduct));
2371         umidi->usb_id = usb_id;
2372         timer_setup(&umidi->error_timer, snd_usbmidi_error_timer, 0);
2373 
2374         /* detect the endpoint(s) to use */
2375         memset(endpoints, 0, sizeof(endpoints));
2376         switch (quirk ? quirk->type : QUIRK_MIDI_STANDARD_INTERFACE) {
2377         case QUIRK_MIDI_STANDARD_INTERFACE:
2378                 err = snd_usbmidi_get_ms_info(umidi, endpoints);
2379                 if (umidi->usb_id == USB_ID(0x0763, 0x0150)) /* M-Audio Uno */
2380                         umidi->usb_protocol_ops =
2381                                 &snd_usbmidi_maudio_broken_running_status_ops;
2382                 break;
2383         case QUIRK_MIDI_US122L:
2384                 umidi->usb_protocol_ops = &snd_usbmidi_122l_ops;
2385                 /* fall through */
2386         case QUIRK_MIDI_FIXED_ENDPOINT:
2387                 memcpy(&endpoints[0], quirk->data,
2388                        sizeof(struct snd_usb_midi_endpoint_info));
2389                 err = snd_usbmidi_detect_endpoints(umidi, &endpoints[0], 1);
2390                 break;
2391         case QUIRK_MIDI_YAMAHA:
2392                 err = snd_usbmidi_detect_yamaha(umidi, &endpoints[0]);
2393                 break;
2394         case QUIRK_MIDI_ROLAND:
2395                 err = snd_usbmidi_detect_roland(umidi, &endpoints[0]);
2396                 break;
2397         case QUIRK_MIDI_MIDIMAN:
2398                 umidi->usb_protocol_ops = &snd_usbmidi_midiman_ops;
2399                 memcpy(&endpoints[0], quirk->data,
2400                        sizeof(struct snd_usb_midi_endpoint_info));
2401                 err = 0;
2402                 break;
2403         case QUIRK_MIDI_NOVATION:
2404                 umidi->usb_protocol_ops = &snd_usbmidi_novation_ops;
2405                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2406                 break;
2407         case QUIRK_MIDI_RAW_BYTES:
2408                 umidi->usb_protocol_ops = &snd_usbmidi_raw_ops;
2409                 /*
2410                  * Interface 1 contains isochronous endpoints, but with the same
2411                  * numbers as in interface 0.  Since it is interface 1 that the
2412                  * USB core has most recently seen, these descriptors are now
2413                  * associated with the endpoint numbers.  This will foul up our
2414                  * attempts to submit bulk/interrupt URBs to the endpoints in
2415                  * interface 0, so we have to make sure that the USB core looks
2416                  * again at interface 0 by calling usb_set_interface() on it.
2417                  */
2418                 if (umidi->usb_id == USB_ID(0x07fd, 0x0001)) /* MOTU Fastlane */
2419                         usb_set_interface(umidi->dev, 0, 0);
2420                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2421                 break;
2422         case QUIRK_MIDI_EMAGIC:
2423                 umidi->usb_protocol_ops = &snd_usbmidi_emagic_ops;
2424                 memcpy(&endpoints[0], quirk->data,
2425                        sizeof(struct snd_usb_midi_endpoint_info));
2426                 err = snd_usbmidi_detect_endpoints(umidi, &endpoints[0], 1);
2427                 break;
2428         case QUIRK_MIDI_CME:
2429                 umidi->usb_protocol_ops = &snd_usbmidi_cme_ops;
2430                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2431                 break;
2432         case QUIRK_MIDI_AKAI:
2433                 umidi->usb_protocol_ops = &snd_usbmidi_akai_ops;
2434                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2435                 /* endpoint 1 is input-only */
2436                 endpoints[1].out_cables = 0;
2437                 break;
2438         case QUIRK_MIDI_FTDI:
2439                 umidi->usb_protocol_ops = &snd_usbmidi_ftdi_ops;
2440 
2441                 /* set baud rate to 31250 (48 MHz / 16 / 96) */
2442                 err = usb_control_msg(umidi->dev, usb_sndctrlpipe(umidi->dev, 0),
2443                                       3, 0x40, 0x60, 0, NULL, 0, 1000);
2444                 if (err < 0)
2445                         break;
2446 
2447                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2448                 break;
2449         case QUIRK_MIDI_CH345:
2450                 umidi->usb_protocol_ops = &snd_usbmidi_ch345_broken_sysex_ops;
2451                 err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
2452                 break;
2453         default:
2454                 dev_err(&umidi->dev->dev, "invalid quirk type %d\n",
2455                         quirk->type);
2456                 err = -ENXIO;
2457                 break;
2458         }
2459         if (err < 0)
2460                 goto free_midi;
2461 
2462         /* create rawmidi device */
2463         out_ports = 0;
2464         in_ports = 0;
2465         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
2466                 out_ports += hweight16(endpoints[i].out_cables);
2467                 in_ports += hweight16(endpoints[i].in_cables);
2468         }
2469         err = snd_usbmidi_create_rawmidi(umidi, out_ports, in_ports);
2470         if (err < 0)
2471                 goto free_midi;
2472 
2473         /* create endpoint/port structures */
2474         if (quirk && quirk->type == QUIRK_MIDI_MIDIMAN)
2475                 err = snd_usbmidi_create_endpoints_midiman(umidi, &endpoints[0]);
2476         else
2477                 err = snd_usbmidi_create_endpoints(umidi, endpoints);
2478         if (err < 0)
2479                 goto exit;
2480 
2481         usb_autopm_get_interface_no_resume(umidi->iface);
2482 
2483         list_add_tail(&umidi->list, midi_list);
2484         return 0;
2485 
2486 free_midi:
2487         kfree(umidi);
2488 exit:
2489         return err;
2490 }
2491 EXPORT_SYMBOL(__snd_usbmidi_create);
2492 

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