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22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/slab.h>
25#include <linux/device.h>
26
27#include <sound/core.h>
28#include <sound/initval.h>
29#include <sound/rawmidi.h>
30
31#include <linux/usb/ch9.h>
32#include <linux/usb/gadget.h>
33#include <linux/usb/audio.h>
34#include <linux/usb/midi.h>
35
36#include "u_f.h"
37#include "u_midi.h"
38
39MODULE_AUTHOR("Ben Williamson");
40MODULE_LICENSE("GPL v2");
41
42static const char f_midi_shortname[] = "f_midi";
43static const char f_midi_longname[] = "MIDI Gadget";
44
45
46
47
48
49
50#define MAX_PORTS 16
51
52
53
54
55
56
57struct gmidi_in_port {
58 struct f_midi *midi;
59 int active;
60 uint8_t cable;
61 uint8_t state;
62#define STATE_UNKNOWN 0
63#define STATE_1PARAM 1
64#define STATE_2PARAM_1 2
65#define STATE_2PARAM_2 3
66#define STATE_SYSEX_0 4
67#define STATE_SYSEX_1 5
68#define STATE_SYSEX_2 6
69 uint8_t data[2];
70};
71
72struct f_midi {
73 struct usb_function func;
74 struct usb_gadget *gadget;
75 struct usb_ep *in_ep, *out_ep;
76 struct snd_card *card;
77 struct snd_rawmidi *rmidi;
78
79 struct snd_rawmidi_substream *in_substream[MAX_PORTS];
80 struct snd_rawmidi_substream *out_substream[MAX_PORTS];
81 struct gmidi_in_port *in_port[MAX_PORTS];
82
83 unsigned long out_triggered;
84 struct tasklet_struct tasklet;
85 unsigned int in_ports;
86 unsigned int out_ports;
87 int index;
88 char *id;
89 unsigned int buflen, qlen;
90};
91
92static inline struct f_midi *func_to_midi(struct usb_function *f)
93{
94 return container_of(f, struct f_midi, func);
95}
96
97static void f_midi_transmit(struct f_midi *midi, struct usb_request *req);
98
99DECLARE_UAC_AC_HEADER_DESCRIPTOR(1);
100DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(1);
101DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(16);
102
103
104static struct usb_interface_descriptor ac_interface_desc = {
105 .bLength = USB_DT_INTERFACE_SIZE,
106 .bDescriptorType = USB_DT_INTERFACE,
107
108
109 .bInterfaceClass = USB_CLASS_AUDIO,
110 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
111
112};
113
114
115static struct uac1_ac_header_descriptor_1 ac_header_desc = {
116 .bLength = UAC_DT_AC_HEADER_SIZE(1),
117 .bDescriptorType = USB_DT_CS_INTERFACE,
118 .bDescriptorSubtype = USB_MS_HEADER,
119 .bcdADC = cpu_to_le16(0x0100),
120 .wTotalLength = cpu_to_le16(UAC_DT_AC_HEADER_SIZE(1)),
121 .bInCollection = 1,
122
123};
124
125
126static struct usb_interface_descriptor ms_interface_desc = {
127 .bLength = USB_DT_INTERFACE_SIZE,
128 .bDescriptorType = USB_DT_INTERFACE,
129
130 .bNumEndpoints = 2,
131 .bInterfaceClass = USB_CLASS_AUDIO,
132 .bInterfaceSubClass = USB_SUBCLASS_MIDISTREAMING,
133
134};
135
136
137static struct usb_ms_header_descriptor ms_header_desc = {
138 .bLength = USB_DT_MS_HEADER_SIZE,
139 .bDescriptorType = USB_DT_CS_INTERFACE,
140 .bDescriptorSubtype = USB_MS_HEADER,
141 .bcdMSC = cpu_to_le16(0x0100),
142
143};
144
145
146static struct usb_endpoint_descriptor bulk_out_desc = {
147 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
148 .bDescriptorType = USB_DT_ENDPOINT,
149 .bEndpointAddress = USB_DIR_OUT,
150 .bmAttributes = USB_ENDPOINT_XFER_BULK,
151};
152
153
154static struct usb_ms_endpoint_descriptor_16 ms_out_desc = {
155
156 .bDescriptorType = USB_DT_CS_ENDPOINT,
157 .bDescriptorSubtype = USB_MS_GENERAL,
158
159
160};
161
162
163static struct usb_endpoint_descriptor bulk_in_desc = {
164 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
165 .bDescriptorType = USB_DT_ENDPOINT,
166 .bEndpointAddress = USB_DIR_IN,
167 .bmAttributes = USB_ENDPOINT_XFER_BULK,
168};
169
170
171static struct usb_ms_endpoint_descriptor_16 ms_in_desc = {
172
173 .bDescriptorType = USB_DT_CS_ENDPOINT,
174 .bDescriptorSubtype = USB_MS_GENERAL,
175
176
177};
178
179
180
181#define STRING_FUNC_IDX 0
182
183static struct usb_string midi_string_defs[] = {
184 [STRING_FUNC_IDX].s = "MIDI function",
185 { }
186};
187
188static struct usb_gadget_strings midi_stringtab = {
189 .language = 0x0409,
190 .strings = midi_string_defs,
191};
192
193static struct usb_gadget_strings *midi_strings[] = {
194 &midi_stringtab,
195 NULL,
196};
197
198static inline struct usb_request *midi_alloc_ep_req(struct usb_ep *ep,
199 unsigned length)
200{
201 return alloc_ep_req(ep, length, length);
202}
203
204static void free_ep_req(struct usb_ep *ep, struct usb_request *req)
205{
206 kfree(req->buf);
207 usb_ep_free_request(ep, req);
208}
209
210static const uint8_t f_midi_cin_length[] = {
211 0, 0, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 2, 2, 3, 1
212};
213
214
215
216
217static void f_midi_read_data(struct usb_ep *ep, int cable,
218 uint8_t *data, int length)
219{
220 struct f_midi *midi = ep->driver_data;
221 struct snd_rawmidi_substream *substream = midi->out_substream[cable];
222
223 if (!substream)
224
225 return;
226
227 if (!test_bit(cable, &midi->out_triggered))
228 return;
229
230 snd_rawmidi_receive(substream, data, length);
231}
232
233static void f_midi_handle_out_data(struct usb_ep *ep, struct usb_request *req)
234{
235 unsigned int i;
236 u8 *buf = req->buf;
237
238 for (i = 0; i + 3 < req->actual; i += 4)
239 if (buf[i] != 0) {
240 int cable = buf[i] >> 4;
241 int length = f_midi_cin_length[buf[i] & 0x0f];
242 f_midi_read_data(ep, cable, &buf[i + 1], length);
243 }
244}
245
246static void
247f_midi_complete(struct usb_ep *ep, struct usb_request *req)
248{
249 struct f_midi *midi = ep->driver_data;
250 struct usb_composite_dev *cdev = midi->func.config->cdev;
251 int status = req->status;
252
253 switch (status) {
254 case 0:
255 if (ep == midi->out_ep) {
256
257 f_midi_handle_out_data(ep, req);
258 } else if (ep == midi->in_ep) {
259
260
261 f_midi_transmit(midi, req);
262 return;
263 }
264 break;
265
266
267 case -ECONNABORTED:
268 case -ECONNRESET:
269 case -ESHUTDOWN:
270 VDBG(cdev, "%s gone (%d), %d/%d\n", ep->name, status,
271 req->actual, req->length);
272 if (ep == midi->out_ep)
273 f_midi_handle_out_data(ep, req);
274
275 free_ep_req(ep, req);
276 return;
277
278 case -EOVERFLOW:
279
280
281 default:
282 DBG(cdev, "%s complete --> %d, %d/%d\n", ep->name,
283 status, req->actual, req->length);
284 break;
285 case -EREMOTEIO:
286 break;
287 }
288
289 status = usb_ep_queue(ep, req, GFP_ATOMIC);
290 if (status) {
291 ERROR(cdev, "kill %s: resubmit %d bytes --> %d\n",
292 ep->name, req->length, status);
293 usb_ep_set_halt(ep);
294
295 }
296}
297
298static int f_midi_start_ep(struct f_midi *midi,
299 struct usb_function *f,
300 struct usb_ep *ep)
301{
302 int err;
303 struct usb_composite_dev *cdev = f->config->cdev;
304
305 if (ep->driver_data)
306 usb_ep_disable(ep);
307
308 err = config_ep_by_speed(midi->gadget, f, ep);
309 if (err) {
310 ERROR(cdev, "can't configure %s: %d\n", ep->name, err);
311 return err;
312 }
313
314 err = usb_ep_enable(ep);
315 if (err) {
316 ERROR(cdev, "can't start %s: %d\n", ep->name, err);
317 return err;
318 }
319
320 ep->driver_data = midi;
321
322 return 0;
323}
324
325static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
326{
327 struct f_midi *midi = func_to_midi(f);
328 struct usb_composite_dev *cdev = f->config->cdev;
329 unsigned i;
330 int err;
331
332
333 if (intf == 0)
334 return 0;
335
336 err = f_midi_start_ep(midi, f, midi->in_ep);
337 if (err)
338 return err;
339
340 err = f_midi_start_ep(midi, f, midi->out_ep);
341 if (err)
342 return err;
343
344 if (midi->out_ep->driver_data)
345 usb_ep_disable(midi->out_ep);
346
347 err = config_ep_by_speed(midi->gadget, f, midi->out_ep);
348 if (err) {
349 ERROR(cdev, "can't configure %s: %d\n",
350 midi->out_ep->name, err);
351 return err;
352 }
353
354 err = usb_ep_enable(midi->out_ep);
355 if (err) {
356 ERROR(cdev, "can't start %s: %d\n",
357 midi->out_ep->name, err);
358 return err;
359 }
360
361 midi->out_ep->driver_data = midi;
362
363
364 for (i = 0; i < midi->qlen && err == 0; i++) {
365 struct usb_request *req =
366 midi_alloc_ep_req(midi->out_ep, midi->buflen);
367 if (req == NULL)
368 return -ENOMEM;
369
370 req->complete = f_midi_complete;
371 err = usb_ep_queue(midi->out_ep, req, GFP_ATOMIC);
372 if (err) {
373 ERROR(midi, "%s queue req: %d\n",
374 midi->out_ep->name, err);
375 }
376 }
377
378 return 0;
379}
380
381static void f_midi_disable(struct usb_function *f)
382{
383 struct f_midi *midi = func_to_midi(f);
384 struct usb_composite_dev *cdev = f->config->cdev;
385
386 DBG(cdev, "disable\n");
387
388
389
390
391
392 usb_ep_disable(midi->in_ep);
393 usb_ep_disable(midi->out_ep);
394}
395
396static int f_midi_snd_free(struct snd_device *device)
397{
398 return 0;
399}
400
401static void f_midi_transmit_packet(struct usb_request *req, uint8_t p0,
402 uint8_t p1, uint8_t p2, uint8_t p3)
403{
404 unsigned length = req->length;
405 u8 *buf = (u8 *)req->buf + length;
406
407 buf[0] = p0;
408 buf[1] = p1;
409 buf[2] = p2;
410 buf[3] = p3;
411 req->length = length + 4;
412}
413
414
415
416
417static void f_midi_transmit_byte(struct usb_request *req,
418 struct gmidi_in_port *port, uint8_t b)
419{
420 uint8_t p0 = port->cable << 4;
421
422 if (b >= 0xf8) {
423 f_midi_transmit_packet(req, p0 | 0x0f, b, 0, 0);
424 } else if (b >= 0xf0) {
425 switch (b) {
426 case 0xf0:
427 port->data[0] = b;
428 port->state = STATE_SYSEX_1;
429 break;
430 case 0xf1:
431 case 0xf3:
432 port->data[0] = b;
433 port->state = STATE_1PARAM;
434 break;
435 case 0xf2:
436 port->data[0] = b;
437 port->state = STATE_2PARAM_1;
438 break;
439 case 0xf4:
440 case 0xf5:
441 port->state = STATE_UNKNOWN;
442 break;
443 case 0xf6:
444 f_midi_transmit_packet(req, p0 | 0x05, 0xf6, 0, 0);
445 port->state = STATE_UNKNOWN;
446 break;
447 case 0xf7:
448 switch (port->state) {
449 case STATE_SYSEX_0:
450 f_midi_transmit_packet(req,
451 p0 | 0x05, 0xf7, 0, 0);
452 break;
453 case STATE_SYSEX_1:
454 f_midi_transmit_packet(req,
455 p0 | 0x06, port->data[0], 0xf7, 0);
456 break;
457 case STATE_SYSEX_2:
458 f_midi_transmit_packet(req,
459 p0 | 0x07, port->data[0],
460 port->data[1], 0xf7);
461 break;
462 }
463 port->state = STATE_UNKNOWN;
464 break;
465 }
466 } else if (b >= 0x80) {
467 port->data[0] = b;
468 if (b >= 0xc0 && b <= 0xdf)
469 port->state = STATE_1PARAM;
470 else
471 port->state = STATE_2PARAM_1;
472 } else {
473 switch (port->state) {
474 case STATE_1PARAM:
475 if (port->data[0] < 0xf0) {
476 p0 |= port->data[0] >> 4;
477 } else {
478 p0 |= 0x02;
479 port->state = STATE_UNKNOWN;
480 }
481 f_midi_transmit_packet(req, p0, port->data[0], b, 0);
482 break;
483 case STATE_2PARAM_1:
484 port->data[1] = b;
485 port->state = STATE_2PARAM_2;
486 break;
487 case STATE_2PARAM_2:
488 if (port->data[0] < 0xf0) {
489 p0 |= port->data[0] >> 4;
490 port->state = STATE_2PARAM_1;
491 } else {
492 p0 |= 0x03;
493 port->state = STATE_UNKNOWN;
494 }
495 f_midi_transmit_packet(req,
496 p0, port->data[0], port->data[1], b);
497 break;
498 case STATE_SYSEX_0:
499 port->data[0] = b;
500 port->state = STATE_SYSEX_1;
501 break;
502 case STATE_SYSEX_1:
503 port->data[1] = b;
504 port->state = STATE_SYSEX_2;
505 break;
506 case STATE_SYSEX_2:
507 f_midi_transmit_packet(req,
508 p0 | 0x04, port->data[0], port->data[1], b);
509 port->state = STATE_SYSEX_0;
510 break;
511 }
512 }
513}
514
515static void f_midi_transmit(struct f_midi *midi, struct usb_request *req)
516{
517 struct usb_ep *ep = midi->in_ep;
518 int i;
519
520 if (!ep)
521 return;
522
523 if (!req)
524 req = midi_alloc_ep_req(ep, midi->buflen);
525
526 if (!req) {
527 ERROR(midi, "%s: alloc_ep_request failed\n", __func__);
528 return;
529 }
530 req->length = 0;
531 req->complete = f_midi_complete;
532
533 for (i = 0; i < MAX_PORTS; i++) {
534 struct gmidi_in_port *port = midi->in_port[i];
535 struct snd_rawmidi_substream *substream = midi->in_substream[i];
536
537 if (!port || !port->active || !substream)
538 continue;
539
540 while (req->length + 3 < midi->buflen) {
541 uint8_t b;
542 if (snd_rawmidi_transmit(substream, &b, 1) != 1) {
543 port->active = 0;
544 break;
545 }
546 f_midi_transmit_byte(req, port, b);
547 }
548 }
549
550 if (req->length > 0)
551 usb_ep_queue(ep, req, GFP_ATOMIC);
552 else
553 free_ep_req(ep, req);
554}
555
556static void f_midi_in_tasklet(unsigned long data)
557{
558 struct f_midi *midi = (struct f_midi *) data;
559 f_midi_transmit(midi, NULL);
560}
561
562static int f_midi_in_open(struct snd_rawmidi_substream *substream)
563{
564 struct f_midi *midi = substream->rmidi->private_data;
565
566 if (!midi->in_port[substream->number])
567 return -EINVAL;
568
569 VDBG(midi, "%s()\n", __func__);
570 midi->in_substream[substream->number] = substream;
571 midi->in_port[substream->number]->state = STATE_UNKNOWN;
572 return 0;
573}
574
575static int f_midi_in_close(struct snd_rawmidi_substream *substream)
576{
577 struct f_midi *midi = substream->rmidi->private_data;
578
579 VDBG(midi, "%s()\n", __func__);
580 return 0;
581}
582
583static void f_midi_in_trigger(struct snd_rawmidi_substream *substream, int up)
584{
585 struct f_midi *midi = substream->rmidi->private_data;
586
587 if (!midi->in_port[substream->number])
588 return;
589
590 VDBG(midi, "%s() %d\n", __func__, up);
591 midi->in_port[substream->number]->active = up;
592 if (up)
593 tasklet_hi_schedule(&midi->tasklet);
594}
595
596static int f_midi_out_open(struct snd_rawmidi_substream *substream)
597{
598 struct f_midi *midi = substream->rmidi->private_data;
599
600 if (substream->number >= MAX_PORTS)
601 return -EINVAL;
602
603 VDBG(midi, "%s()\n", __func__);
604 midi->out_substream[substream->number] = substream;
605 return 0;
606}
607
608static int f_midi_out_close(struct snd_rawmidi_substream *substream)
609{
610 struct f_midi *midi = substream->rmidi->private_data;
611
612 VDBG(midi, "%s()\n", __func__);
613 return 0;
614}
615
616static void f_midi_out_trigger(struct snd_rawmidi_substream *substream, int up)
617{
618 struct f_midi *midi = substream->rmidi->private_data;
619
620 VDBG(midi, "%s()\n", __func__);
621
622 if (up)
623 set_bit(substream->number, &midi->out_triggered);
624 else
625 clear_bit(substream->number, &midi->out_triggered);
626}
627
628static struct snd_rawmidi_ops gmidi_in_ops = {
629 .open = f_midi_in_open,
630 .close = f_midi_in_close,
631 .trigger = f_midi_in_trigger,
632};
633
634static struct snd_rawmidi_ops gmidi_out_ops = {
635 .open = f_midi_out_open,
636 .close = f_midi_out_close,
637 .trigger = f_midi_out_trigger
638};
639
640static inline void f_midi_unregister_card(struct f_midi *midi)
641{
642 if (midi->card) {
643 snd_card_free(midi->card);
644 midi->card = NULL;
645 }
646}
647
648
649static int f_midi_register_card(struct f_midi *midi)
650{
651 struct snd_card *card;
652 struct snd_rawmidi *rmidi;
653 int err;
654 static struct snd_device_ops ops = {
655 .dev_free = f_midi_snd_free,
656 };
657
658 err = snd_card_new(&midi->gadget->dev, midi->index, midi->id,
659 THIS_MODULE, 0, &card);
660 if (err < 0) {
661 ERROR(midi, "snd_card_new() failed\n");
662 goto fail;
663 }
664 midi->card = card;
665
666 err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, midi, &ops);
667 if (err < 0) {
668 ERROR(midi, "snd_device_new() failed: error %d\n", err);
669 goto fail;
670 }
671
672 strcpy(card->driver, f_midi_longname);
673 strcpy(card->longname, f_midi_longname);
674 strcpy(card->shortname, f_midi_shortname);
675
676
677 snd_component_add(card, "MIDI");
678 err = snd_rawmidi_new(card, card->longname, 0,
679 midi->out_ports, midi->in_ports, &rmidi);
680 if (err < 0) {
681 ERROR(midi, "snd_rawmidi_new() failed: error %d\n", err);
682 goto fail;
683 }
684 midi->rmidi = rmidi;
685 strcpy(rmidi->name, card->shortname);
686 rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
687 SNDRV_RAWMIDI_INFO_INPUT |
688 SNDRV_RAWMIDI_INFO_DUPLEX;
689 rmidi->private_data = midi;
690
691
692
693
694
695 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &gmidi_in_ops);
696 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &gmidi_out_ops);
697
698
699 err = snd_card_register(card);
700 if (err < 0) {
701 ERROR(midi, "snd_card_register() failed\n");
702 goto fail;
703 }
704
705 VDBG(midi, "%s() finished ok\n", __func__);
706 return 0;
707
708fail:
709 f_midi_unregister_card(midi);
710 return err;
711}
712
713
714
715static int f_midi_bind(struct usb_configuration *c, struct usb_function *f)
716{
717 struct usb_descriptor_header **midi_function;
718 struct usb_midi_in_jack_descriptor jack_in_ext_desc[MAX_PORTS];
719 struct usb_midi_in_jack_descriptor jack_in_emb_desc[MAX_PORTS];
720 struct usb_midi_out_jack_descriptor_1 jack_out_ext_desc[MAX_PORTS];
721 struct usb_midi_out_jack_descriptor_1 jack_out_emb_desc[MAX_PORTS];
722 struct usb_composite_dev *cdev = c->cdev;
723 struct f_midi *midi = func_to_midi(f);
724 struct usb_string *us;
725 int status, n, jack = 1, i = 0;
726
727 midi->gadget = cdev->gadget;
728 tasklet_init(&midi->tasklet, f_midi_in_tasklet, (unsigned long) midi);
729 status = f_midi_register_card(midi);
730 if (status < 0)
731 goto fail_register;
732
733
734 us = usb_gstrings_attach(c->cdev, midi_strings,
735 ARRAY_SIZE(midi_string_defs));
736 if (IS_ERR(us)) {
737 status = PTR_ERR(us);
738 goto fail;
739 }
740 ac_interface_desc.iInterface = us[STRING_FUNC_IDX].id;
741
742
743 status = usb_interface_id(c, f);
744 if (status < 0)
745 goto fail;
746 ac_interface_desc.bInterfaceNumber = status;
747
748 status = usb_interface_id(c, f);
749 if (status < 0)
750 goto fail;
751 ms_interface_desc.bInterfaceNumber = status;
752 ac_header_desc.baInterfaceNr[0] = status;
753
754 status = -ENODEV;
755
756
757 midi->in_ep = usb_ep_autoconfig(cdev->gadget, &bulk_in_desc);
758 if (!midi->in_ep)
759 goto fail;
760 midi->in_ep->driver_data = cdev;
761
762 midi->out_ep = usb_ep_autoconfig(cdev->gadget, &bulk_out_desc);
763 if (!midi->out_ep)
764 goto fail;
765 midi->out_ep->driver_data = cdev;
766
767
768 midi_function = kcalloc((MAX_PORTS * 4) + 9, sizeof(*midi_function),
769 GFP_KERNEL);
770 if (!midi_function) {
771 status = -ENOMEM;
772 goto fail;
773 }
774
775
776
777
778
779
780
781
782 midi_function[i++] = (struct usb_descriptor_header *) &ac_interface_desc;
783 midi_function[i++] = (struct usb_descriptor_header *) &ac_header_desc;
784 midi_function[i++] = (struct usb_descriptor_header *) &ms_interface_desc;
785
786
787 n = USB_DT_MS_HEADER_SIZE
788 + (midi->in_ports + midi->out_ports) *
789 (USB_DT_MIDI_IN_SIZE + USB_DT_MIDI_OUT_SIZE(1));
790 ms_header_desc.wTotalLength = cpu_to_le16(n);
791
792 midi_function[i++] = (struct usb_descriptor_header *) &ms_header_desc;
793
794
795 for (n = 0; n < midi->in_ports; n++) {
796 struct usb_midi_in_jack_descriptor *in_ext = &jack_in_ext_desc[n];
797 struct usb_midi_out_jack_descriptor_1 *out_emb = &jack_out_emb_desc[n];
798
799 in_ext->bLength = USB_DT_MIDI_IN_SIZE;
800 in_ext->bDescriptorType = USB_DT_CS_INTERFACE;
801 in_ext->bDescriptorSubtype = USB_MS_MIDI_IN_JACK;
802 in_ext->bJackType = USB_MS_EXTERNAL;
803 in_ext->bJackID = jack++;
804 in_ext->iJack = 0;
805 midi_function[i++] = (struct usb_descriptor_header *) in_ext;
806
807 out_emb->bLength = USB_DT_MIDI_OUT_SIZE(1);
808 out_emb->bDescriptorType = USB_DT_CS_INTERFACE;
809 out_emb->bDescriptorSubtype = USB_MS_MIDI_OUT_JACK;
810 out_emb->bJackType = USB_MS_EMBEDDED;
811 out_emb->bJackID = jack++;
812 out_emb->bNrInputPins = 1;
813 out_emb->pins[0].baSourcePin = 1;
814 out_emb->pins[0].baSourceID = in_ext->bJackID;
815 out_emb->iJack = 0;
816 midi_function[i++] = (struct usb_descriptor_header *) out_emb;
817
818
819 ms_in_desc.baAssocJackID[n] = out_emb->bJackID;
820 }
821
822
823 for (n = 0; n < midi->out_ports; n++) {
824 struct usb_midi_in_jack_descriptor *in_emb = &jack_in_emb_desc[n];
825 struct usb_midi_out_jack_descriptor_1 *out_ext = &jack_out_ext_desc[n];
826
827 in_emb->bLength = USB_DT_MIDI_IN_SIZE;
828 in_emb->bDescriptorType = USB_DT_CS_INTERFACE;
829 in_emb->bDescriptorSubtype = USB_MS_MIDI_IN_JACK;
830 in_emb->bJackType = USB_MS_EMBEDDED;
831 in_emb->bJackID = jack++;
832 in_emb->iJack = 0;
833 midi_function[i++] = (struct usb_descriptor_header *) in_emb;
834
835 out_ext->bLength = USB_DT_MIDI_OUT_SIZE(1);
836 out_ext->bDescriptorType = USB_DT_CS_INTERFACE;
837 out_ext->bDescriptorSubtype = USB_MS_MIDI_OUT_JACK;
838 out_ext->bJackType = USB_MS_EXTERNAL;
839 out_ext->bJackID = jack++;
840 out_ext->bNrInputPins = 1;
841 out_ext->iJack = 0;
842 out_ext->pins[0].baSourceID = in_emb->bJackID;
843 out_ext->pins[0].baSourcePin = 1;
844 midi_function[i++] = (struct usb_descriptor_header *) out_ext;
845
846
847 ms_out_desc.baAssocJackID[n] = in_emb->bJackID;
848 }
849
850
851 ms_out_desc.bLength = USB_DT_MS_ENDPOINT_SIZE(midi->in_ports);
852 ms_out_desc.bNumEmbMIDIJack = midi->in_ports;
853
854 ms_in_desc.bLength = USB_DT_MS_ENDPOINT_SIZE(midi->out_ports);
855 ms_in_desc.bNumEmbMIDIJack = midi->out_ports;
856
857
858 midi_function[i++] = (struct usb_descriptor_header *) &bulk_out_desc;
859 midi_function[i++] = (struct usb_descriptor_header *) &ms_out_desc;
860 midi_function[i++] = (struct usb_descriptor_header *) &bulk_in_desc;
861 midi_function[i++] = (struct usb_descriptor_header *) &ms_in_desc;
862 midi_function[i++] = NULL;
863
864
865
866
867
868
869
870 f->fs_descriptors = usb_copy_descriptors(midi_function);
871 if (!f->fs_descriptors)
872 goto fail_f_midi;
873
874 if (gadget_is_dualspeed(c->cdev->gadget)) {
875 bulk_in_desc.wMaxPacketSize = cpu_to_le16(512);
876 bulk_out_desc.wMaxPacketSize = cpu_to_le16(512);
877 f->hs_descriptors = usb_copy_descriptors(midi_function);
878 if (!f->hs_descriptors)
879 goto fail_f_midi;
880 }
881
882 kfree(midi_function);
883
884 return 0;
885
886fail_f_midi:
887 kfree(midi_function);
888 usb_free_descriptors(f->hs_descriptors);
889fail:
890 f_midi_unregister_card(midi);
891fail_register:
892
893 if (midi->out_ep)
894 midi->out_ep->driver_data = NULL;
895 if (midi->in_ep)
896 midi->in_ep->driver_data = NULL;
897
898 ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
899
900 return status;
901}
902
903static inline struct f_midi_opts *to_f_midi_opts(struct config_item *item)
904{
905 return container_of(to_config_group(item), struct f_midi_opts,
906 func_inst.group);
907}
908
909CONFIGFS_ATTR_STRUCT(f_midi_opts);
910CONFIGFS_ATTR_OPS(f_midi_opts);
911
912static void midi_attr_release(struct config_item *item)
913{
914 struct f_midi_opts *opts = to_f_midi_opts(item);
915
916 usb_put_function_instance(&opts->func_inst);
917}
918
919static struct configfs_item_operations midi_item_ops = {
920 .release = midi_attr_release,
921 .show_attribute = f_midi_opts_attr_show,
922 .store_attribute = f_midi_opts_attr_store,
923};
924
925#define F_MIDI_OPT(name, test_limit, limit) \
926static ssize_t f_midi_opts_##name##_show(struct f_midi_opts *opts, char *page) \
927{ \
928 int result; \
929 \
930 mutex_lock(&opts->lock); \
931 result = sprintf(page, "%d\n", opts->name); \
932 mutex_unlock(&opts->lock); \
933 \
934 return result; \
935} \
936 \
937static ssize_t f_midi_opts_##name##_store(struct f_midi_opts *opts, \
938 const char *page, size_t len) \
939{ \
940 int ret; \
941 u32 num; \
942 \
943 mutex_lock(&opts->lock); \
944 if (opts->refcnt) { \
945 ret = -EBUSY; \
946 goto end; \
947 } \
948 \
949 ret = kstrtou32(page, 0, &num); \
950 if (ret) \
951 goto end; \
952 \
953 if (test_limit && num > limit) { \
954 ret = -EINVAL; \
955 goto end; \
956 } \
957 opts->name = num; \
958 ret = len; \
959 \
960end: \
961 mutex_unlock(&opts->lock); \
962 return ret; \
963} \
964 \
965static struct f_midi_opts_attribute f_midi_opts_##name = \
966 __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, f_midi_opts_##name##_show, \
967 f_midi_opts_##name##_store)
968
969F_MIDI_OPT(index, true, SNDRV_CARDS);
970F_MIDI_OPT(buflen, false, 0);
971F_MIDI_OPT(qlen, false, 0);
972F_MIDI_OPT(in_ports, true, MAX_PORTS);
973F_MIDI_OPT(out_ports, true, MAX_PORTS);
974
975static ssize_t f_midi_opts_id_show(struct f_midi_opts *opts, char *page)
976{
977 int result;
978
979 mutex_lock(&opts->lock);
980 if (opts->id) {
981 result = strlcpy(page, opts->id, PAGE_SIZE);
982 } else {
983 page[0] = 0;
984 result = 0;
985 }
986
987 mutex_unlock(&opts->lock);
988
989 return result;
990}
991
992static ssize_t f_midi_opts_id_store(struct f_midi_opts *opts,
993 const char *page, size_t len)
994{
995 int ret;
996 char *c;
997
998 mutex_lock(&opts->lock);
999 if (opts->refcnt) {
1000 ret = -EBUSY;
1001 goto end;
1002 }
1003
1004 c = kstrndup(page, len, GFP_KERNEL);
1005 if (!c) {
1006 ret = -ENOMEM;
1007 goto end;
1008 }
1009 if (opts->id_allocated)
1010 kfree(opts->id);
1011 opts->id = c;
1012 opts->id_allocated = true;
1013 ret = len;
1014end:
1015 mutex_unlock(&opts->lock);
1016 return ret;
1017}
1018
1019static struct f_midi_opts_attribute f_midi_opts_id =
1020 __CONFIGFS_ATTR(id, S_IRUGO | S_IWUSR, f_midi_opts_id_show,
1021 f_midi_opts_id_store);
1022
1023static struct configfs_attribute *midi_attrs[] = {
1024 &f_midi_opts_index.attr,
1025 &f_midi_opts_buflen.attr,
1026 &f_midi_opts_qlen.attr,
1027 &f_midi_opts_in_ports.attr,
1028 &f_midi_opts_out_ports.attr,
1029 &f_midi_opts_id.attr,
1030 NULL,
1031};
1032
1033static struct config_item_type midi_func_type = {
1034 .ct_item_ops = &midi_item_ops,
1035 .ct_attrs = midi_attrs,
1036 .ct_owner = THIS_MODULE,
1037};
1038
1039static void f_midi_free_inst(struct usb_function_instance *f)
1040{
1041 struct f_midi_opts *opts;
1042
1043 opts = container_of(f, struct f_midi_opts, func_inst);
1044
1045 if (opts->id_allocated)
1046 kfree(opts->id);
1047
1048 kfree(opts);
1049}
1050
1051static struct usb_function_instance *f_midi_alloc_inst(void)
1052{
1053 struct f_midi_opts *opts;
1054
1055 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1056 if (!opts)
1057 return ERR_PTR(-ENOMEM);
1058
1059 mutex_init(&opts->lock);
1060 opts->func_inst.free_func_inst = f_midi_free_inst;
1061 opts->index = SNDRV_DEFAULT_IDX1;
1062 opts->id = SNDRV_DEFAULT_STR1;
1063 opts->buflen = 256;
1064 opts->qlen = 32;
1065 opts->in_ports = 1;
1066 opts->out_ports = 1;
1067
1068 config_group_init_type_name(&opts->func_inst.group, "",
1069 &midi_func_type);
1070
1071 return &opts->func_inst;
1072}
1073
1074static void f_midi_free(struct usb_function *f)
1075{
1076 struct f_midi *midi;
1077 struct f_midi_opts *opts;
1078 int i;
1079
1080 midi = func_to_midi(f);
1081 opts = container_of(f->fi, struct f_midi_opts, func_inst);
1082 kfree(midi->id);
1083 mutex_lock(&opts->lock);
1084 for (i = opts->in_ports - 1; i >= 0; --i)
1085 kfree(midi->in_port[i]);
1086 kfree(midi);
1087 --opts->refcnt;
1088 mutex_unlock(&opts->lock);
1089}
1090
1091static void f_midi_unbind(struct usb_configuration *c, struct usb_function *f)
1092{
1093 struct usb_composite_dev *cdev = f->config->cdev;
1094 struct f_midi *midi = func_to_midi(f);
1095 struct snd_card *card;
1096
1097 DBG(cdev, "unbind\n");
1098
1099
1100 f_midi_disable(f);
1101
1102 card = midi->card;
1103 midi->card = NULL;
1104 if (card)
1105 snd_card_free(card);
1106
1107 usb_free_all_descriptors(f);
1108}
1109
1110static struct usb_function *f_midi_alloc(struct usb_function_instance *fi)
1111{
1112 struct f_midi *midi;
1113 struct f_midi_opts *opts;
1114 int status, i;
1115
1116 opts = container_of(fi, struct f_midi_opts, func_inst);
1117
1118 mutex_lock(&opts->lock);
1119
1120 if (opts->in_ports > MAX_PORTS || opts->out_ports > MAX_PORTS) {
1121 mutex_unlock(&opts->lock);
1122 return ERR_PTR(-EINVAL);
1123 }
1124
1125
1126 midi = kzalloc(sizeof(*midi), GFP_KERNEL);
1127 if (!midi) {
1128 mutex_unlock(&opts->lock);
1129 return ERR_PTR(-ENOMEM);
1130 }
1131
1132 for (i = 0; i < opts->in_ports; i++) {
1133 struct gmidi_in_port *port = kzalloc(sizeof(*port), GFP_KERNEL);
1134
1135 if (!port) {
1136 status = -ENOMEM;
1137 mutex_unlock(&opts->lock);
1138 goto setup_fail;
1139 }
1140
1141 port->midi = midi;
1142 port->active = 0;
1143 port->cable = i;
1144 midi->in_port[i] = port;
1145 }
1146
1147
1148 midi->id = kstrdup(opts->id, GFP_KERNEL);
1149 if (opts->id && !midi->id) {
1150 status = -ENOMEM;
1151 mutex_unlock(&opts->lock);
1152 goto setup_fail;
1153 }
1154 midi->in_ports = opts->in_ports;
1155 midi->out_ports = opts->out_ports;
1156 midi->index = opts->index;
1157 midi->buflen = opts->buflen;
1158 midi->qlen = opts->qlen;
1159 ++opts->refcnt;
1160 mutex_unlock(&opts->lock);
1161
1162 midi->func.name = "gmidi function";
1163 midi->func.bind = f_midi_bind;
1164 midi->func.unbind = f_midi_unbind;
1165 midi->func.set_alt = f_midi_set_alt;
1166 midi->func.disable = f_midi_disable;
1167 midi->func.free_func = f_midi_free;
1168
1169 return &midi->func;
1170
1171setup_fail:
1172 for (--i; i >= 0; i--)
1173 kfree(midi->in_port[i]);
1174 kfree(midi);
1175 return ERR_PTR(status);
1176}
1177
1178DECLARE_USB_FUNCTION_INIT(midi, f_midi_alloc_inst, f_midi_alloc);
1179
