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usb: gadget: f_midi: move some of f_midi_transmit to separate func
[deliverable/linux.git] / drivers / usb / gadget / function / f_midi.c
CommitLineData
d5daf49b
DM		 1/*
2 * f_midi.c -- USB MIDI class function driver
3 *
4 * Copyright (C) 2006 Thumtronics Pty Ltd.
5 * Developed for Thumtronics by Grey Innovation
6 * Ben Williamson <ben.williamson@greyinnovation.com>
7 *
8 * Rewritten for the composite framework
9 * Copyright (C) 2011 Daniel Mack <zonque@gmail.com>
10 *
11 * Based on drivers/usb/gadget/f_audio.c,
12 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
13 * Copyright (C) 2008 Analog Devices, Inc
14 *
15 * and drivers/usb/gadget/midi.c,
16 * Copyright (C) 2006 Thumtronics Pty Ltd.
17 * Ben Williamson <ben.williamson@greyinnovation.com>
18 *
19 * Licensed under the GPL-2 or later.
20 */
21
22#include <linux/kernel.h>
b85e9de9 23#include <linux/module.h>
d5daf49b 24#include <linux/slab.h>
d5daf49b 25#include <linux/device.h>
e1e3d7ec 26#include <linux/kfifo.h>
d5daf49b
DM		 27
28#include <sound/core.h>
29#include <sound/initval.h>
30#include <sound/rawmidi.h>
31
32#include <linux/usb/ch9.h>
33#include <linux/usb/gadget.h>
34#include <linux/usb/audio.h>
35#include <linux/usb/midi.h>
36
1efd54ea 37#include "u_f.h"
b85e9de9 38#include "u_midi.h"
1efd54ea 39
d5daf49b
DM		 40MODULE_AUTHOR("Ben Williamson");
41MODULE_LICENSE("GPL v2");
42
43static const char f_midi_shortname[] = "f_midi";
44static const char f_midi_longname[] = "MIDI Gadget";
45
c8933c3f
DM		 46/*
47 * We can only handle 16 cables on one single endpoint, as cable numbers are
48 * stored in 4-bit fields. And as the interface currently only holds one
49 * single endpoint, this is the maximum number of ports we can allow.
50 */
51#define MAX_PORTS 16
52
d5daf49b
DM		 53/*
54 * This is a gadget, and the IN/OUT naming is from the host's perspective.
55 * USB -> OUT endpoint -> rawmidi
56 * USB <- IN endpoint <- rawmidi
57 */
58struct gmidi_in_port {
d5daf49b 59 int active;
c8933c3f 60 uint8_t cable;
d5daf49b
DM		 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;
919de443 78 u8 ms_id;
d5daf49b 79
c8933c3f
DM		 80 struct snd_rawmidi_substream *in_substream[MAX_PORTS];
81 struct snd_rawmidi_substream *out_substream[MAX_PORTS];
82 struct gmidi_in_port *in_port[MAX_PORTS];
83
d5daf49b
DM		 84 unsigned long out_triggered;
85 struct tasklet_struct tasklet;
c8933c3f
DM		 86 unsigned int in_ports;
87 unsigned int out_ports;
d5daf49b
DM		 88 int index;
89 char *id;
90 unsigned int buflen, qlen;
e1e3d7ec
FT		 91 /* This fifo is used as a buffer ring for pre-allocated IN usb_requests */
92 DECLARE_KFIFO_PTR(in_req_fifo, struct usb_request *);
93 unsigned int in_last_port;
d5daf49b
DM		 94};
95
96static inline struct f_midi *func_to_midi(struct usb_function *f)
97{
98 return container_of(f, struct f_midi, func);
99}
100
e1e3d7ec 101static void f_midi_transmit(struct f_midi *midi);
d5daf49b
DM		 102
103DECLARE_UAC_AC_HEADER_DESCRIPTOR(1);
104DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(1);
c8933c3f 105DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(16);
d5daf49b
DM		 106
107/* B.3.1 Standard AC Interface Descriptor */
b85e9de9 108static struct usb_interface_descriptor ac_interface_desc = {
d5daf49b
DM		 109 .bLength = USB_DT_INTERFACE_SIZE,
110 .bDescriptorType = USB_DT_INTERFACE,
111 /* .bInterfaceNumber = DYNAMIC */
112 /* .bNumEndpoints = DYNAMIC */
113 .bInterfaceClass = USB_CLASS_AUDIO,
114 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
115 /* .iInterface = DYNAMIC */
116};
117
118/* B.3.2 Class-Specific AC Interface Descriptor */
b85e9de9 119static struct uac1_ac_header_descriptor_1 ac_header_desc = {
d5daf49b
DM		 120 .bLength = UAC_DT_AC_HEADER_SIZE(1),
121 .bDescriptorType = USB_DT_CS_INTERFACE,
122 .bDescriptorSubtype = USB_MS_HEADER,
123 .bcdADC = cpu_to_le16(0x0100),
124 .wTotalLength = cpu_to_le16(UAC_DT_AC_HEADER_SIZE(1)),
125 .bInCollection = 1,
126 /* .baInterfaceNr = DYNAMIC */
127};
128
129/* B.4.1 Standard MS Interface Descriptor */
b85e9de9 130static struct usb_interface_descriptor ms_interface_desc = {
d5daf49b
DM		 131 .bLength = USB_DT_INTERFACE_SIZE,
132 .bDescriptorType = USB_DT_INTERFACE,
133 /* .bInterfaceNumber = DYNAMIC */
134 .bNumEndpoints = 2,
135 .bInterfaceClass = USB_CLASS_AUDIO,
136 .bInterfaceSubClass = USB_SUBCLASS_MIDISTREAMING,
137 /* .iInterface = DYNAMIC */
138};
139
140/* B.4.2 Class-Specific MS Interface Descriptor */
b85e9de9 141static struct usb_ms_header_descriptor ms_header_desc = {
d5daf49b
DM		 142 .bLength = USB_DT_MS_HEADER_SIZE,
143 .bDescriptorType = USB_DT_CS_INTERFACE,
144 .bDescriptorSubtype = USB_MS_HEADER,
145 .bcdMSC = cpu_to_le16(0x0100),
c8933c3f 146 /* .wTotalLength = DYNAMIC */
d5daf49b
DM		 147};
148
d5daf49b
DM		 149/* B.5.1 Standard Bulk OUT Endpoint Descriptor */
150static struct usb_endpoint_descriptor bulk_out_desc = {
151 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
152 .bDescriptorType = USB_DT_ENDPOINT,
153 .bEndpointAddress = USB_DIR_OUT,
154 .bmAttributes = USB_ENDPOINT_XFER_BULK,
155};
156
157/* B.5.2 Class-specific MS Bulk OUT Endpoint Descriptor */
c8933c3f
DM		 158static struct usb_ms_endpoint_descriptor_16 ms_out_desc = {
159 /* .bLength = DYNAMIC */
d5daf49b
DM		 160 .bDescriptorType = USB_DT_CS_ENDPOINT,
161 .bDescriptorSubtype = USB_MS_GENERAL,
c8933c3f
DM		 162 /* .bNumEmbMIDIJack = DYNAMIC */
163 /* .baAssocJackID = DYNAMIC */
d5daf49b
DM		 164};
165
166/* B.6.1 Standard Bulk IN Endpoint Descriptor */
167static struct usb_endpoint_descriptor bulk_in_desc = {
168 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
169 .bDescriptorType = USB_DT_ENDPOINT,
170 .bEndpointAddress = USB_DIR_IN,
171 .bmAttributes = USB_ENDPOINT_XFER_BULK,
172};
173
174/* B.6.2 Class-specific MS Bulk IN Endpoint Descriptor */
c8933c3f
DM		 175static struct usb_ms_endpoint_descriptor_16 ms_in_desc = {
176 /* .bLength = DYNAMIC */
d5daf49b
DM		 177 .bDescriptorType = USB_DT_CS_ENDPOINT,
178 .bDescriptorSubtype = USB_MS_GENERAL,
c8933c3f
DM		 179 /* .bNumEmbMIDIJack = DYNAMIC */
180 /* .baAssocJackID = DYNAMIC */
d5daf49b
DM		 181};
182
183/* string IDs are assigned dynamically */
184
185#define STRING_FUNC_IDX 0
186
187static struct usb_string midi_string_defs[] = {
188 [STRING_FUNC_IDX].s = "MIDI function",
189 { } /* end of list */
190};
191
192static struct usb_gadget_strings midi_stringtab = {
193 .language = 0x0409, /* en-us */
194 .strings = midi_string_defs,
195};
196
197static struct usb_gadget_strings *midi_strings[] = {
198 &midi_stringtab,
199 NULL,
200};
201
1efd54ea
AP		 202static inline struct usb_request *midi_alloc_ep_req(struct usb_ep *ep,
203 unsigned length)
d5daf49b 204{
1efd54ea 205 return alloc_ep_req(ep, length, length);
d5daf49b
DM		 206}
207
d5daf49b
DM		 208static const uint8_t f_midi_cin_length[] = {
209 0, 0, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 2, 2, 3, 1
210};
211
212/*
213 * Receives a chunk of MIDI data.
214 */
215static void f_midi_read_data(struct usb_ep *ep, int cable,
216 uint8_t *data, int length)
217{
218 struct f_midi *midi = ep->driver_data;
c8933c3f 219 struct snd_rawmidi_substream *substream = midi->out_substream[cable];
d5daf49b 220
c8933c3f 221 if (!substream)
d5daf49b
DM		 222 /* Nobody is listening - throw it on the floor. */
223 return;
224
c8933c3f 225 if (!test_bit(cable, &midi->out_triggered))
d5daf49b
DM		 226 return;
227
c8933c3f 228 snd_rawmidi_receive(substream, data, length);
d5daf49b
DM		 229}
230
231static void f_midi_handle_out_data(struct usb_ep *ep, struct usb_request *req)
232{
233 unsigned int i;
234 u8 *buf = req->buf;
235
236 for (i = 0; i + 3 < req->actual; i += 4)
237 if (buf[i] != 0) {
238 int cable = buf[i] >> 4;
239 int length = f_midi_cin_length[buf[i] & 0x0f];
240 f_midi_read_data(ep, cable, &buf[i + 1], length);
241 }
242}
243
244static void
245f_midi_complete(struct usb_ep *ep, struct usb_request *req)
246{
247 struct f_midi *midi = ep->driver_data;
248 struct usb_composite_dev *cdev = midi->func.config->cdev;
249 int status = req->status;
250
251 switch (status) {
252 case 0: /* normal completion */
253 if (ep == midi->out_ep) {
254 /* We received stuff. req is queued again, below */
255 f_midi_handle_out_data(ep, req);
256 } else if (ep == midi->in_ep) {
257 /* Our transmit completed. See if there's more to go.
258 * f_midi_transmit eats req, don't queue it again. */
e1e3d7ec
FT		 259 req->length = 0;
260 f_midi_transmit(midi);
d5daf49b
DM		 261 return;
262 }
263 break;
264
265 /* this endpoint is normally active while we're configured */
266 case -ECONNABORTED: /* hardware forced ep reset */
267 case -ECONNRESET: /* request dequeued */
268 case -ESHUTDOWN: /* disconnect from host */
269 VDBG(cdev, "%s gone (%d), %d/%d\n", ep->name, status,
270 req->actual, req->length);
e1e3d7ec 271 if (ep == midi->out_ep) {
d5daf49b 272 f_midi_handle_out_data(ep, req);
e1e3d7ec
FT		 273 /* We don't need to free IN requests because it's handled
274 * by the midi->in_req_fifo. */
275 free_ep_req(ep, req);
276 }
d5daf49b
DM		 277 return;
278
279 case -EOVERFLOW: /* buffer overrun on read means that
280 * we didn't provide a big enough buffer.
281 */
282 default:
283 DBG(cdev, "%s complete --> %d, %d/%d\n", ep->name,
284 status, req->actual, req->length);
285 break;
286 case -EREMOTEIO: /* short read */
287 break;
288 }
289
290 status = usb_ep_queue(ep, req, GFP_ATOMIC);
291 if (status) {
292 ERROR(cdev, "kill %s: resubmit %d bytes --> %d\n",
293 ep->name, req->length, status);
294 usb_ep_set_halt(ep);
295 /* FIXME recover later ... somehow */
296 }
297}
298
299static int f_midi_start_ep(struct f_midi *midi,
300 struct usb_function *f,
301 struct usb_ep *ep)
302{
303 int err;
304 struct usb_composite_dev *cdev = f->config->cdev;
305
ce723951 306 usb_ep_disable(ep);
d5daf49b
DM		 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);
d5daf49b
DM		 328 unsigned i;
329 int err;
330
919de443
FT		 331 /* we only set alt for MIDIStreaming interface */
332 if (intf != midi->ms_id)
4ef7a4a1
RB		 333 return 0;
334
d5daf49b
DM		 335 err = f_midi_start_ep(midi, f, midi->in_ep);
336 if (err)
337 return err;
338
339 err = f_midi_start_ep(midi, f, midi->out_ep);
340 if (err)
341 return err;
342
e1e3d7ec
FT		 343 /* pre-allocate write usb requests to use on f_midi_transmit. */
344 while (kfifo_avail(&midi->in_req_fifo)) {
345 struct usb_request *req =
346 midi_alloc_ep_req(midi->in_ep, midi->buflen);
347
348 if (req == NULL)
349 return -ENOMEM;
350
351 req->length = 0;
352 req->complete = f_midi_complete;
353
354 kfifo_put(&midi->in_req_fifo, req);
355 }
356
d5daf49b
DM		 357 /* allocate a bunch of read buffers and queue them all at once. */
358 for (i = 0; i < midi->qlen && err == 0; i++) {
359 struct usb_request *req =
1efd54ea 360 midi_alloc_ep_req(midi->out_ep, midi->buflen);
d5daf49b
DM		 361 if (req == NULL)
362 return -ENOMEM;
363
364 req->complete = f_midi_complete;
365 err = usb_ep_queue(midi->out_ep, req, GFP_ATOMIC);
366 if (err) {
f0f1b8ca 367 ERROR(midi, "%s: couldn't enqueue request: %d\n",
d5daf49b 368 midi->out_ep->name, err);
ad0d1a05 369 free_ep_req(midi->out_ep, req);
f0f1b8ca 370 return err;
d5daf49b
DM		 371 }
372 }
373
374 return 0;
375}
376
377static void f_midi_disable(struct usb_function *f)
378{
379 struct f_midi *midi = func_to_midi(f);
380 struct usb_composite_dev *cdev = f->config->cdev;
e1e3d7ec 381 struct usb_request *req = NULL;
d5daf49b
DM		 382
383 DBG(cdev, "disable\n");
384
385 /*
386 * just disable endpoints, forcing completion of pending i/o.
387 * all our completion handlers free their requests in this case.
388 */
389 usb_ep_disable(midi->in_ep);
390 usb_ep_disable(midi->out_ep);
e1e3d7ec
FT		 391
392 /* release IN requests */
393 while (kfifo_get(&midi->in_req_fifo, &req))
394 free_ep_req(midi->in_ep, req);
d5daf49b
DM		 395}
396
d5daf49b
DM		 397static int f_midi_snd_free(struct snd_device *device)
398{
399 return 0;
400}
401
402static void f_midi_transmit_packet(struct usb_request *req, uint8_t p0,
403 uint8_t p1, uint8_t p2, uint8_t p3)
404{
405 unsigned length = req->length;
406 u8 *buf = (u8 *)req->buf + length;
407
408 buf[0] = p0;
409 buf[1] = p1;
410 buf[2] = p2;
411 buf[3] = p3;
412 req->length = length + 4;
413}
414
415/*
416 * Converts MIDI commands to USB MIDI packets.
417 */
418static void f_midi_transmit_byte(struct usb_request *req,
419 struct gmidi_in_port *port, uint8_t b)
420{
c8933c3f 421 uint8_t p0 = port->cable << 4;
d5daf49b
DM		 422
423 if (b >= 0xf8) {
424 f_midi_transmit_packet(req, p0 | 0x0f, b, 0, 0);
425 } else if (b >= 0xf0) {
426 switch (b) {
427 case 0xf0:
428 port->data[0] = b;
429 port->state = STATE_SYSEX_1;
430 break;
431 case 0xf1:
432 case 0xf3:
433 port->data[0] = b;
434 port->state = STATE_1PARAM;
435 break;
436 case 0xf2:
437 port->data[0] = b;
438 port->state = STATE_2PARAM_1;
439 break;
440 case 0xf4:
441 case 0xf5:
442 port->state = STATE_UNKNOWN;
443 break;
444 case 0xf6:
445 f_midi_transmit_packet(req, p0 | 0x05, 0xf6, 0, 0);
446 port->state = STATE_UNKNOWN;
447 break;
448 case 0xf7:
449 switch (port->state) {
450 case STATE_SYSEX_0:
451 f_midi_transmit_packet(req,
452 p0 | 0x05, 0xf7, 0, 0);
453 break;
454 case STATE_SYSEX_1:
455 f_midi_transmit_packet(req,
456 p0 | 0x06, port->data[0], 0xf7, 0);
457 break;
458 case STATE_SYSEX_2:
459 f_midi_transmit_packet(req,
460 p0 | 0x07, port->data[0],
461 port->data[1], 0xf7);
462 break;
463 }
464 port->state = STATE_UNKNOWN;
465 break;
466 }
467 } else if (b >= 0x80) {
468 port->data[0] = b;
469 if (b >= 0xc0 && b <= 0xdf)
470 port->state = STATE_1PARAM;
471 else
472 port->state = STATE_2PARAM_1;
473 } else { /* b < 0x80 */
474 switch (port->state) {
475 case STATE_1PARAM:
476 if (port->data[0] < 0xf0) {
477 p0 |= port->data[0] >> 4;
478 } else {
479 p0 |= 0x02;
480 port->state = STATE_UNKNOWN;
481 }
482 f_midi_transmit_packet(req, p0, port->data[0], b, 0);
483 break;
484 case STATE_2PARAM_1:
485 port->data[1] = b;
486 port->state = STATE_2PARAM_2;
487 break;
488 case STATE_2PARAM_2:
489 if (port->data[0] < 0xf0) {
490 p0 |= port->data[0] >> 4;
491 port->state = STATE_2PARAM_1;
492 } else {
493 p0 |= 0x03;
494 port->state = STATE_UNKNOWN;
495 }
496 f_midi_transmit_packet(req,
497 p0, port->data[0], port->data[1], b);
498 break;
499 case STATE_SYSEX_0:
500 port->data[0] = b;
501 port->state = STATE_SYSEX_1;
502 break;
503 case STATE_SYSEX_1:
504 port->data[1] = b;
505 port->state = STATE_SYSEX_2;
506 break;
507 case STATE_SYSEX_2:
508 f_midi_transmit_packet(req,
509 p0 | 0x04, port->data[0], port->data[1], b);
510 port->state = STATE_SYSEX_0;
511 break;
512 }
513 }
514}
515
e1e3d7ec 516static void f_midi_drop_out_substreams(struct f_midi *midi)
d5daf49b 517{
e1e3d7ec 518 unsigned int i;
d5daf49b 519
c8933c3f
DM		 520 for (i = 0; i < MAX_PORTS; i++) {
521 struct gmidi_in_port *port = midi->in_port[i];
522 struct snd_rawmidi_substream *substream = midi->in_substream[i];
523
e1e3d7ec
FT		 524 if (!port)
525 break;
526
527 if (!port->active || !substream)
c8933c3f
DM		 528 continue;
529
e1e3d7ec
FT		 530 snd_rawmidi_drop_output(substream);
531 }
532}
533
9a71eb56 534static int f_midi_do_transmit(struct f_midi *midi, struct usb_ep *ep)
e1e3d7ec 535{
9a71eb56
MN		 536 struct usb_request *req = NULL;
537 unsigned int len, i;
538 bool active = false;
539 int err;
e1e3d7ec 540
9a71eb56
MN		 541 /*
542 * We peek the request in order to reuse it if it fails to enqueue on
543 * its endpoint
544 */
545 len = kfifo_peek(&midi->in_req_fifo, &req);
546 if (len != 1) {
547 ERROR(midi, "%s: Couldn't get usb request\n", __func__);
548 return -1;
549 }
e1e3d7ec 550
9a71eb56
MN		 551 /*
552 * If buffer overrun, then we ignore this transmission.
553 * IMPORTANT: This will cause the user-space rawmidi device to block
554 * until a) usb requests have been completed or b) snd_rawmidi_write()
555 * times out.
556 */
557 if (req->length > 0)
558 return 0;
e1e3d7ec 559
9a71eb56
MN		 560 for (i = midi->in_last_port; i < MAX_PORTS; i++) {
561 struct gmidi_in_port *port = midi->in_port[i];
562 struct snd_rawmidi_substream *substream = midi->in_substream[i];
e1e3d7ec 563
9a71eb56
MN		 564 if (!port) {
565 /* Reset counter when we reach the last available port */
566 midi->in_last_port = 0;
567 break;
e1e3d7ec
FT		 568 }
569
9a71eb56
MN		 570 if (!port->active || !substream)
571 continue;
e1e3d7ec 572
9a71eb56
MN		 573 while (req->length + 3 < midi->buflen) {
574 uint8_t b;
e1e3d7ec 575
9a71eb56
MN		 576 if (snd_rawmidi_transmit(substream, &b, 1) != 1) {
577 port->active = 0;
e1e3d7ec
FT		 578 break;
579 }
9a71eb56
MN		 580 f_midi_transmit_byte(req, port, b);
581 }
e1e3d7ec 582
9a71eb56
MN		 583 active = !!port->active;
584 /*
585 * Check if last port is still active, which means that there is
586 * still data on that substream but this current request run out
587 * of space.
588 */
589 if (active) {
590 midi->in_last_port = i;
591 /* There is no need to re-iterate though midi ports. */
592 break;
593 }
594 }
e1e3d7ec 595
9a71eb56
MN		 596 if (req->length <= 0)
597 return active;
598
599 err = usb_ep_queue(ep, req, GFP_ATOMIC);
600 if (err < 0) {
601 ERROR(midi, "%s failed to queue req: %d\n",
602 midi->in_ep->name, err);
603 req->length = 0; /* Re-use request next time. */
604 } else {
605 /* Upon success, put request at the back of the queue. */
606 kfifo_skip(&midi->in_req_fifo);
607 kfifo_put(&midi->in_req_fifo, req);
608 }
e1e3d7ec 609
9a71eb56
MN		 610 return active;
611}
e1e3d7ec 612
9a71eb56
MN		 613static void f_midi_transmit(struct f_midi *midi)
614{
615 struct usb_ep *ep = midi->in_ep;
616 int ret;
d5daf49b 617
9a71eb56
MN		 618 /* We only care about USB requests if IN endpoint is enabled */
619 if (!ep || !ep->enabled)
620 goto drop_out;
f35fe4be 621
9a71eb56
MN		 622 do {
623 ret = f_midi_do_transmit(midi, ep);
624 if (ret < 0)
625 goto drop_out;
626 } while (ret);
e1e3d7ec
FT		 627
628 return;
629
630drop_out:
631 f_midi_drop_out_substreams(midi);
d5daf49b
DM		 632}
633
634static void f_midi_in_tasklet(unsigned long data)
635{
636 struct f_midi *midi = (struct f_midi *) data;
e1e3d7ec 637 f_midi_transmit(midi);
d5daf49b
DM		 638}
639
640static int f_midi_in_open(struct snd_rawmidi_substream *substream)
641{
642 struct f_midi *midi = substream->rmidi->private_data;
643
c8933c3f
DM		 644 if (!midi->in_port[substream->number])
645 return -EINVAL;
646
d5daf49b 647 VDBG(midi, "%s()\n", __func__);
c8933c3f
DM		 648 midi->in_substream[substream->number] = substream;
649 midi->in_port[substream->number]->state = STATE_UNKNOWN;
d5daf49b
DM		 650 return 0;
651}
652
653static int f_midi_in_close(struct snd_rawmidi_substream *substream)
654{
655 struct f_midi *midi = substream->rmidi->private_data;
656
657 VDBG(midi, "%s()\n", __func__);
658 return 0;
659}
660
661static void f_midi_in_trigger(struct snd_rawmidi_substream *substream, int up)
662{
663 struct f_midi *midi = substream->rmidi->private_data;
664
c8933c3f
DM		 665 if (!midi->in_port[substream->number])
666 return;
667
d5daf49b 668 VDBG(midi, "%s() %d\n", __func__, up);
c8933c3f 669 midi->in_port[substream->number]->active = up;
d5daf49b
DM		 670 if (up)
671 tasklet_hi_schedule(&midi->tasklet);
672}
673
674static int f_midi_out_open(struct snd_rawmidi_substream *substream)
675{
676 struct f_midi *midi = substream->rmidi->private_data;
677
08895512 678 if (substream->number >= MAX_PORTS)
c8933c3f
DM		 679 return -EINVAL;
680
d5daf49b 681 VDBG(midi, "%s()\n", __func__);
c8933c3f 682 midi->out_substream[substream->number] = substream;
d5daf49b
DM		 683 return 0;
684}
685
686static int f_midi_out_close(struct snd_rawmidi_substream *substream)
687{
688 struct f_midi *midi = substream->rmidi->private_data;
689
690 VDBG(midi, "%s()\n", __func__);
691 return 0;
692}
693
694static void f_midi_out_trigger(struct snd_rawmidi_substream *substream, int up)
695{
696 struct f_midi *midi = substream->rmidi->private_data;
697
698 VDBG(midi, "%s()\n", __func__);
699
700 if (up)
701 set_bit(substream->number, &midi->out_triggered);
702 else
703 clear_bit(substream->number, &midi->out_triggered);
704}
705
706static struct snd_rawmidi_ops gmidi_in_ops = {
707 .open = f_midi_in_open,
708 .close = f_midi_in_close,
709 .trigger = f_midi_in_trigger,
710};
711
712static struct snd_rawmidi_ops gmidi_out_ops = {
713 .open = f_midi_out_open,
714 .close = f_midi_out_close,
715 .trigger = f_midi_out_trigger
716};
717
d23b4c3e
AP		 718static inline void f_midi_unregister_card(struct f_midi *midi)
719{
720 if (midi->card) {
721 snd_card_free(midi->card);
722 midi->card = NULL;
723 }
724}
725
d5daf49b
DM		 726/* register as a sound "card" */
727static int f_midi_register_card(struct f_midi *midi)
728{
729 struct snd_card *card;
730 struct snd_rawmidi *rmidi;
731 int err;
d5daf49b
DM		 732 static struct snd_device_ops ops = {
733 .dev_free = f_midi_snd_free,
734 };
735
13345095
TI		 736 err = snd_card_new(&midi->gadget->dev, midi->index, midi->id,
737 THIS_MODULE, 0, &card);
d5daf49b 738 if (err < 0) {
13345095 739 ERROR(midi, "snd_card_new() failed\n");
d5daf49b
DM		 740 goto fail;
741 }
742 midi->card = card;
743
744 err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, midi, &ops);
745 if (err < 0) {
746 ERROR(midi, "snd_device_new() failed: error %d\n", err);
747 goto fail;
748 }
749
750 strcpy(card->driver, f_midi_longname);
751 strcpy(card->longname, f_midi_longname);
752 strcpy(card->shortname, f_midi_shortname);
753
754 /* Set up rawmidi */
d5daf49b
DM		 755 snd_component_add(card, "MIDI");
756 err = snd_rawmidi_new(card, card->longname, 0,
c8933c3f 757 midi->out_ports, midi->in_ports, &rmidi);
d5daf49b
DM		 758 if (err < 0) {
759 ERROR(midi, "snd_rawmidi_new() failed: error %d\n", err);
760 goto fail;
761 }
762 midi->rmidi = rmidi;
e1e3d7ec 763 midi->in_last_port = 0;
d5daf49b
DM		 764 strcpy(rmidi->name, card->shortname);
765 rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
766 SNDRV_RAWMIDI_INFO_INPUT |
767 SNDRV_RAWMIDI_INFO_DUPLEX;
768 rmidi->private_data = midi;
769
770 /*
771 * Yes, rawmidi OUTPUT = USB IN, and rawmidi INPUT = USB OUT.
772 * It's an upside-down world being a gadget.
773 */
774 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &gmidi_in_ops);
775 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &gmidi_out_ops);
776
d5daf49b
DM		 777 /* register it - we're ready to go */
778 err = snd_card_register(card);
779 if (err < 0) {
780 ERROR(midi, "snd_card_register() failed\n");
781 goto fail;
782 }
783
784 VDBG(midi, "%s() finished ok\n", __func__);
785 return 0;
786
787fail:
d23b4c3e 788 f_midi_unregister_card(midi);
d5daf49b
DM		 789 return err;
790}
791
792/* MIDI function driver setup/binding */
793
b85e9de9 794static int f_midi_bind(struct usb_configuration *c, struct usb_function *f)
d5daf49b 795{
74203de0 796 struct usb_descriptor_header **midi_function;
c8933c3f 797 struct usb_midi_in_jack_descriptor jack_in_ext_desc[MAX_PORTS];
74203de0 798 struct usb_midi_in_jack_descriptor jack_in_emb_desc[MAX_PORTS];
c8933c3f 799 struct usb_midi_out_jack_descriptor_1 jack_out_ext_desc[MAX_PORTS];
74203de0 800 struct usb_midi_out_jack_descriptor_1 jack_out_emb_desc[MAX_PORTS];
d5daf49b
DM		 801 struct usb_composite_dev *cdev = c->cdev;
802 struct f_midi *midi = func_to_midi(f);
9caa0d77 803 struct usb_string *us;
c8933c3f 804 int status, n, jack = 1, i = 0;
d5daf49b 805
b85e9de9
AP		 806 midi->gadget = cdev->gadget;
807 tasklet_init(&midi->tasklet, f_midi_in_tasklet, (unsigned long) midi);
808 status = f_midi_register_card(midi);
809 if (status < 0)
810 goto fail_register;
811
d5daf49b 812 /* maybe allocate device-global string ID */
9caa0d77
AP		 813 us = usb_gstrings_attach(c->cdev, midi_strings,
814 ARRAY_SIZE(midi_string_defs));
815 if (IS_ERR(us)) {
816 status = PTR_ERR(us);
817 goto fail;
d5daf49b 818 }
9caa0d77 819 ac_interface_desc.iInterface = us[STRING_FUNC_IDX].id;
d5daf49b
DM		 820
821 /* We have two interfaces, AudioControl and MIDIStreaming */
822 status = usb_interface_id(c, f);
823 if (status < 0)
824 goto fail;
825 ac_interface_desc.bInterfaceNumber = status;
826
827 status = usb_interface_id(c, f);
828 if (status < 0)
829 goto fail;
830 ms_interface_desc.bInterfaceNumber = status;
831 ac_header_desc.baInterfaceNr[0] = status;
919de443 832 midi->ms_id = status;
d5daf49b
DM		 833
834 status = -ENODEV;
835
836 /* allocate instance-specific endpoints */
837 midi->in_ep = usb_ep_autoconfig(cdev->gadget, &bulk_in_desc);
838 if (!midi->in_ep)
839 goto fail;
d5daf49b
DM		 840
841 midi->out_ep = usb_ep_autoconfig(cdev->gadget, &bulk_out_desc);
842 if (!midi->out_ep)
843 goto fail;
d5daf49b 844
74203de0 845 /* allocate temporary function list */
2a5be878 846 midi_function = kcalloc((MAX_PORTS * 4) + 9, sizeof(*midi_function),
74203de0
DM		 847 GFP_KERNEL);
848 if (!midi_function) {
849 status = -ENOMEM;
850 goto fail;
851 }
852
c8933c3f
DM		 853 /*
854 * construct the function's descriptor set. As the number of
855 * input and output MIDI ports is configurable, we have to do
856 * it that way.
857 */
858
859 /* add the headers - these are always the same */
860 midi_function[i++] = (struct usb_descriptor_header *) &ac_interface_desc;
861 midi_function[i++] = (struct usb_descriptor_header *) &ac_header_desc;
862 midi_function[i++] = (struct usb_descriptor_header *) &ms_interface_desc;
863
864 /* calculate the header's wTotalLength */
865 n = USB_DT_MS_HEADER_SIZE
74203de0
DM		 866 + (midi->in_ports + midi->out_ports) *
867 (USB_DT_MIDI_IN_SIZE + USB_DT_MIDI_OUT_SIZE(1));
c8933c3f
DM		 868 ms_header_desc.wTotalLength = cpu_to_le16(n);
869
870 midi_function[i++] = (struct usb_descriptor_header *) &ms_header_desc;
871
74203de0 872 /* configure the external IN jacks, each linked to an embedded OUT jack */
c8933c3f 873 for (n = 0; n < midi->in_ports; n++) {
74203de0
DM		 874 struct usb_midi_in_jack_descriptor *in_ext = &jack_in_ext_desc[n];
875 struct usb_midi_out_jack_descriptor_1 *out_emb = &jack_out_emb_desc[n];
876
877 in_ext->bLength = USB_DT_MIDI_IN_SIZE;
878 in_ext->bDescriptorType = USB_DT_CS_INTERFACE;
879 in_ext->bDescriptorSubtype = USB_MS_MIDI_IN_JACK;
880 in_ext->bJackType = USB_MS_EXTERNAL;
881 in_ext->bJackID = jack++;
882 in_ext->iJack = 0;
883 midi_function[i++] = (struct usb_descriptor_header *) in_ext;
884
885 out_emb->bLength = USB_DT_MIDI_OUT_SIZE(1);
886 out_emb->bDescriptorType = USB_DT_CS_INTERFACE;
887 out_emb->bDescriptorSubtype = USB_MS_MIDI_OUT_JACK;
888 out_emb->bJackType = USB_MS_EMBEDDED;
889 out_emb->bJackID = jack++;
890 out_emb->bNrInputPins = 1;
891 out_emb->pins[0].baSourcePin = 1;
892 out_emb->pins[0].baSourceID = in_ext->bJackID;
893 out_emb->iJack = 0;
894 midi_function[i++] = (struct usb_descriptor_header *) out_emb;
895
896 /* link it to the endpoint */
897 ms_in_desc.baAssocJackID[n] = out_emb->bJackID;
c8933c3f
DM		 898 }
899
74203de0 900 /* configure the external OUT jacks, each linked to an embedded IN jack */
c8933c3f 901 for (n = 0; n < midi->out_ports; n++) {
74203de0
DM		 902 struct usb_midi_in_jack_descriptor *in_emb = &jack_in_emb_desc[n];
903 struct usb_midi_out_jack_descriptor_1 *out_ext = &jack_out_ext_desc[n];
904
905 in_emb->bLength = USB_DT_MIDI_IN_SIZE;
906 in_emb->bDescriptorType = USB_DT_CS_INTERFACE;
907 in_emb->bDescriptorSubtype = USB_MS_MIDI_IN_JACK;
908 in_emb->bJackType = USB_MS_EMBEDDED;
909 in_emb->bJackID = jack++;
910 in_emb->iJack = 0;
911 midi_function[i++] = (struct usb_descriptor_header *) in_emb;
912
913 out_ext->bLength = USB_DT_MIDI_OUT_SIZE(1);
914 out_ext->bDescriptorType = USB_DT_CS_INTERFACE;
915 out_ext->bDescriptorSubtype = USB_MS_MIDI_OUT_JACK;
916 out_ext->bJackType = USB_MS_EXTERNAL;
917 out_ext->bJackID = jack++;
918 out_ext->bNrInputPins = 1;
919 out_ext->iJack = 0;
920 out_ext->pins[0].baSourceID = in_emb->bJackID;
921 out_ext->pins[0].baSourcePin = 1;
922 midi_function[i++] = (struct usb_descriptor_header *) out_ext;
923
924 /* link it to the endpoint */
925 ms_out_desc.baAssocJackID[n] = in_emb->bJackID;
c8933c3f
DM		 926 }
927
928 /* configure the endpoint descriptors ... */
929 ms_out_desc.bLength = USB_DT_MS_ENDPOINT_SIZE(midi->in_ports);
930 ms_out_desc.bNumEmbMIDIJack = midi->in_ports;
c8933c3f
DM		 931
932 ms_in_desc.bLength = USB_DT_MS_ENDPOINT_SIZE(midi->out_ports);
933 ms_in_desc.bNumEmbMIDIJack = midi->out_ports;
c8933c3f
DM		 934
935 /* ... and add them to the list */
936 midi_function[i++] = (struct usb_descriptor_header *) &bulk_out_desc;
937 midi_function[i++] = (struct usb_descriptor_header *) &ms_out_desc;
938 midi_function[i++] = (struct usb_descriptor_header *) &bulk_in_desc;
939 midi_function[i++] = (struct usb_descriptor_header *) &ms_in_desc;
940 midi_function[i++] = NULL;
941
d5daf49b
DM		 942 /*
943 * support all relevant hardware speeds... we expect that when
944 * hardware is dual speed, all bulk-capable endpoints work at
945 * both speeds
946 */
947 /* copy descriptors, and track endpoint copies */
10287bae
SAS		 948 f->fs_descriptors = usb_copy_descriptors(midi_function);
949 if (!f->fs_descriptors)
7f2a9268 950 goto fail_f_midi;
10287bae 951
d5daf49b 952 if (gadget_is_dualspeed(c->cdev->gadget)) {
d5daf49b
DM		 953 bulk_in_desc.wMaxPacketSize = cpu_to_le16(512);
954 bulk_out_desc.wMaxPacketSize = cpu_to_le16(512);
955 f->hs_descriptors = usb_copy_descriptors(midi_function);
7f2a9268
SAS		 956 if (!f->hs_descriptors)
957 goto fail_f_midi;
d5daf49b
DM		 958 }
959
74203de0
DM		 960 kfree(midi_function);
961
d5daf49b
DM		 962 return 0;
963
7f2a9268
SAS		 964fail_f_midi:
965 kfree(midi_function);
966 usb_free_descriptors(f->hs_descriptors);
d5daf49b 967fail:
b85e9de9
AP		 968 f_midi_unregister_card(midi);
969fail_register:
d5daf49b
DM		 970 ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
971
972 return status;
973}
974
6f1de344
AP		 975static inline struct f_midi_opts *to_f_midi_opts(struct config_item *item)
976{
977 return container_of(to_config_group(item), struct f_midi_opts,
978 func_inst.group);
979}
980
6f1de344
AP		 981static void midi_attr_release(struct config_item *item)
982{
983 struct f_midi_opts *opts = to_f_midi_opts(item);
984
985 usb_put_function_instance(&opts->func_inst);
986}
987
988static struct configfs_item_operations midi_item_ops = {
989 .release = midi_attr_release,
6f1de344
AP		 990};
991
992#define F_MIDI_OPT(name, test_limit, limit) \
3755a273 993static ssize_t f_midi_opts_##name##_show(struct config_item *item, char *page) \
6f1de344 994{ \
3755a273 995 struct f_midi_opts *opts = to_f_midi_opts(item); \
6f1de344
AP		 996 int result; \
997 \
998 mutex_lock(&opts->lock); \
999 result = sprintf(page, "%d\n", opts->name); \
1000 mutex_unlock(&opts->lock); \
1001 \
1002 return result; \
1003} \
1004 \
3755a273 1005static ssize_t f_midi_opts_##name##_store(struct config_item *item, \
6f1de344
AP		 1006 const char *page, size_t len) \
1007{ \
3755a273 1008 struct f_midi_opts *opts = to_f_midi_opts(item); \
6f1de344
AP		 1009 int ret; \
1010 u32 num; \
1011 \
1012 mutex_lock(&opts->lock); \
1013 if (opts->refcnt) { \
1014 ret = -EBUSY; \
1015 goto end; \
1016 } \
1017 \
1018 ret = kstrtou32(page, 0, &num); \
1019 if (ret) \
1020 goto end; \
1021 \
1022 if (test_limit && num > limit) { \
1023 ret = -EINVAL; \
1024 goto end; \
1025 } \
1026 opts->name = num; \
1027 ret = len; \
1028 \
1029end: \
1030 mutex_unlock(&opts->lock); \
1031 return ret; \
1032} \
1033 \
3755a273 1034CONFIGFS_ATTR(f_midi_opts_, name);
6f1de344
AP		 1035
1036F_MIDI_OPT(index, true, SNDRV_CARDS);
1037F_MIDI_OPT(buflen, false, 0);
1038F_MIDI_OPT(qlen, false, 0);
1039F_MIDI_OPT(in_ports, true, MAX_PORTS);
1040F_MIDI_OPT(out_ports, true, MAX_PORTS);
1041
3755a273 1042static ssize_t f_midi_opts_id_show(struct config_item *item, char *page)
6f1de344 1043{
3755a273 1044 struct f_midi_opts *opts = to_f_midi_opts(item);
6f1de344
AP		 1045 int result;
1046
1047 mutex_lock(&opts->lock);
a25a23cc
PS		 1048 if (opts->id) {
1049 result = strlcpy(page, opts->id, PAGE_SIZE);
1050 } else {
1051 page[0] = 0;
1052 result = 0;
1053 }
1054
6f1de344
AP		 1055 mutex_unlock(&opts->lock);
1056
1057 return result;
1058}
1059
3755a273 1060static ssize_t f_midi_opts_id_store(struct config_item *item,
6f1de344
AP		 1061 const char *page, size_t len)
1062{
3755a273 1063 struct f_midi_opts *opts = to_f_midi_opts(item);
6f1de344
AP		 1064 int ret;
1065 char *c;
1066
1067 mutex_lock(&opts->lock);
1068 if (opts->refcnt) {
1069 ret = -EBUSY;
1070 goto end;
1071 }
1072
1073 c = kstrndup(page, len, GFP_KERNEL);
1074 if (!c) {
1075 ret = -ENOMEM;
1076 goto end;
1077 }
1078 if (opts->id_allocated)
1079 kfree(opts->id);
1080 opts->id = c;
1081 opts->id_allocated = true;
1082 ret = len;
1083end:
1084 mutex_unlock(&opts->lock);
1085 return ret;
1086}
1087
3755a273 1088CONFIGFS_ATTR(f_midi_opts_, id);
6f1de344
AP		 1089
1090static struct configfs_attribute *midi_attrs[] = {
3755a273
CH		 1091 &f_midi_opts_attr_index,
1092 &f_midi_opts_attr_buflen,
1093 &f_midi_opts_attr_qlen,
1094 &f_midi_opts_attr_in_ports,
1095 &f_midi_opts_attr_out_ports,
1096 &f_midi_opts_attr_id,
6f1de344
AP		 1097 NULL,
1098};
1099
1100static struct config_item_type midi_func_type = {
1101 .ct_item_ops = &midi_item_ops,
1102 .ct_attrs = midi_attrs,
1103 .ct_owner = THIS_MODULE,
1104};
1105
b85e9de9
AP		 1106static void f_midi_free_inst(struct usb_function_instance *f)
1107{
1108 struct f_midi_opts *opts;
1109
1110 opts = container_of(f, struct f_midi_opts, func_inst);
1111
6f1de344
AP		 1112 if (opts->id_allocated)
1113 kfree(opts->id);
1114
b85e9de9
AP		 1115 kfree(opts);
1116}
1117
1118static struct usb_function_instance *f_midi_alloc_inst(void)
1119{
1120 struct f_midi_opts *opts;
1121
1122 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1123 if (!opts)
1124 return ERR_PTR(-ENOMEM);
6f1de344
AP		 1125
1126 mutex_init(&opts->lock);
b85e9de9 1127 opts->func_inst.free_func_inst = f_midi_free_inst;
6f1de344
AP		 1128 opts->index = SNDRV_DEFAULT_IDX1;
1129 opts->id = SNDRV_DEFAULT_STR1;
1130 opts->buflen = 256;
1131 opts->qlen = 32;
1132 opts->in_ports = 1;
1133 opts->out_ports = 1;
1134
1135 config_group_init_type_name(&opts->func_inst.group, "",
1136 &midi_func_type);
b85e9de9
AP		 1137
1138 return &opts->func_inst;
1139}
1140
1141static void f_midi_free(struct usb_function *f)
1142{
1143 struct f_midi *midi;
1144 struct f_midi_opts *opts;
1145 int i;
1146
1147 midi = func_to_midi(f);
1148 opts = container_of(f->fi, struct f_midi_opts, func_inst);
1149 kfree(midi->id);
6f1de344 1150 mutex_lock(&opts->lock);
b85e9de9
AP		 1151 for (i = opts->in_ports - 1; i >= 0; --i)
1152 kfree(midi->in_port[i]);
e1e3d7ec 1153 kfifo_free(&midi->in_req_fifo);
b85e9de9 1154 kfree(midi);
6f1de344
AP		 1155 --opts->refcnt;
1156 mutex_unlock(&opts->lock);
b85e9de9
AP		 1157}
1158
1159static void f_midi_unbind(struct usb_configuration *c, struct usb_function *f)
1160{
1161 struct usb_composite_dev *cdev = f->config->cdev;
1162 struct f_midi *midi = func_to_midi(f);
1163 struct snd_card *card;
1164
1165 DBG(cdev, "unbind\n");
1166
1167 /* just to be sure */
1168 f_midi_disable(f);
1169
1170 card = midi->card;
1171 midi->card = NULL;
1172 if (card)
1173 snd_card_free(card);
1174
1175 usb_free_all_descriptors(f);
1176}
1177
f509fee8 1178static struct usb_function *f_midi_alloc(struct usb_function_instance *fi)
b85e9de9
AP		 1179{
1180 struct f_midi *midi;
1181 struct f_midi_opts *opts;
1182 int status, i;
1183
1184 opts = container_of(fi, struct f_midi_opts, func_inst);
6f1de344
AP		 1185
1186 mutex_lock(&opts->lock);
b85e9de9 1187 /* sanity check */
6f1de344
AP		 1188 if (opts->in_ports > MAX_PORTS || opts->out_ports > MAX_PORTS) {
1189 mutex_unlock(&opts->lock);
b85e9de9 1190 return ERR_PTR(-EINVAL);
6f1de344 1191 }
b85e9de9
AP		 1192
1193 /* allocate and initialize one new instance */
1194 midi = kzalloc(sizeof(*midi), GFP_KERNEL);
6f1de344
AP		 1195 if (!midi) {
1196 mutex_unlock(&opts->lock);
b85e9de9 1197 return ERR_PTR(-ENOMEM);
6f1de344 1198 }
b85e9de9
AP		 1199
1200 for (i = 0; i < opts->in_ports; i++) {
1201 struct gmidi_in_port *port = kzalloc(sizeof(*port), GFP_KERNEL);
1202
1203 if (!port) {
1204 status = -ENOMEM;
6f1de344 1205 mutex_unlock(&opts->lock);
b85e9de9
AP		 1206 goto setup_fail;
1207 }
1208
b85e9de9
AP		 1209 port->active = 0;
1210 port->cable = i;
1211 midi->in_port[i] = port;
1212 }
1213
1214 /* set up ALSA midi devices */
1215 midi->id = kstrdup(opts->id, GFP_KERNEL);
1216 if (opts->id && !midi->id) {
1217 status = -ENOMEM;
6f1de344 1218 mutex_unlock(&opts->lock);
b2e2c94b 1219 goto setup_fail;
b85e9de9
AP		 1220 }
1221 midi->in_ports = opts->in_ports;
1222 midi->out_ports = opts->out_ports;
1223 midi->index = opts->index;
1224 midi->buflen = opts->buflen;
1225 midi->qlen = opts->qlen;
e1e3d7ec
FT		 1226 midi->in_last_port = 0;
1227
1228 status = kfifo_alloc(&midi->in_req_fifo, midi->qlen, GFP_KERNEL);
1229 if (status)
1230 goto setup_fail;
1231
6f1de344
AP		 1232 ++opts->refcnt;
1233 mutex_unlock(&opts->lock);
b85e9de9
AP		 1234
1235 midi->func.name = "gmidi function";
b85e9de9
AP		 1236 midi->func.bind = f_midi_bind;
1237 midi->func.unbind = f_midi_unbind;
1238 midi->func.set_alt = f_midi_set_alt;
1239 midi->func.disable = f_midi_disable;
1240 midi->func.free_func = f_midi_free;
1241
1242 return &midi->func;
1243
b85e9de9
AP		 1244setup_fail:
1245 for (--i; i >= 0; i--)
1246 kfree(midi->in_port[i]);
1247 kfree(midi);
1248 return ERR_PTR(status);
1249}
1250
1251DECLARE_USB_FUNCTION_INIT(midi, f_midi_alloc_inst, f_midi_alloc);
Linux kernel - Deliverables
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