1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * f_midi.c -- USB MIDI class function driver 4 * 5 * Copyright (C) 2006 Thumtronics Pty Ltd. 6 * Developed for Thumtronics by Grey Innovation 7 * Ben Williamson <ben.williamson@greyinnovation.com> 8 * 9 * Rewritten for the composite framework 10 * Copyright (C) 2011 Daniel Mack <zonque@gmail.com> 11 * 12 * Based on drivers/usb/gadget/f_audio.c, 13 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org> 14 * Copyright (C) 2008 Analog Devices, Inc 15 * 16 * and drivers/usb/gadget/midi.c, 17 * Copyright (C) 2006 Thumtronics Pty Ltd. 18 * Ben Williamson <ben.williamson@greyinnovation.com> 19 */ 20 21 #include <linux/kernel.h> 22 #include <linux/module.h> 23 #include <linux/slab.h> 24 #include <linux/device.h> 25 #include <linux/kfifo.h> 26 #include <linux/spinlock.h> 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/func_utils.h> 34 #include <linux/usb/gadget.h> 35 #include <linux/usb/audio.h> 36 #include <linux/usb/midi.h> 37 38 #include "u_midi.h" 39 40 MODULE_AUTHOR("Ben Williamson"); 41 MODULE_DESCRIPTION("USB MIDI class function driver"); 42 MODULE_LICENSE("GPL v2"); 43 44 static const char f_midi_shortname[] = "f_midi"; 45 static const char f_midi_longname[] = "MIDI Gadget"; 46 47 /* 48 * We can only handle 16 cables on one single endpoint, as cable numbers are 49 * stored in 4-bit fields. And as the interface currently only holds one 50 * single endpoint, this is the maximum number of ports we can allow. 51 */ 52 #define MAX_PORTS 16 53 54 /* MIDI message states */ 55 enum { 56 STATE_INITIAL = 0, /* pseudo state */ 57 STATE_1PARAM, 58 STATE_2PARAM_1, 59 STATE_2PARAM_2, 60 STATE_SYSEX_0, 61 STATE_SYSEX_1, 62 STATE_SYSEX_2, 63 STATE_REAL_TIME, 64 STATE_FINISHED, /* pseudo state */ 65 }; 66 67 /* 68 * This is a gadget, and the IN/OUT naming is from the host's perspective. 69 * USB -> OUT endpoint -> rawmidi 70 * USB <- IN endpoint <- rawmidi 71 */ 72 struct gmidi_in_port { 73 struct snd_rawmidi_substream *substream; 74 int active; 75 uint8_t cable; 76 uint8_t state; 77 uint8_t data[2]; 78 }; 79 80 struct f_midi { 81 struct usb_function func; 82 struct usb_gadget *gadget; 83 struct usb_ep *in_ep, *out_ep; 84 struct snd_card *card; 85 struct snd_rawmidi *rmidi; 86 u8 ms_id; 87 88 struct snd_rawmidi_substream *out_substream[MAX_PORTS]; 89 90 unsigned long out_triggered; 91 struct work_struct work; 92 unsigned int in_ports; 93 unsigned int out_ports; 94 int index; 95 char *id; 96 unsigned int buflen, qlen; 97 /* This fifo is used as a buffer ring for pre-allocated IN usb_requests */ 98 DECLARE_KFIFO_PTR(in_req_fifo, struct usb_request *); 99 spinlock_t transmit_lock; 100 unsigned int in_last_port; 101 unsigned char free_ref; 102 103 struct gmidi_in_port in_ports_array[] __counted_by(in_ports); 104 }; 105 106 static inline struct f_midi *func_to_midi(struct usb_function *f) 107 { 108 return container_of(f, struct f_midi, func); 109 } 110 111 static void f_midi_transmit(struct f_midi *midi); 112 static void f_midi_rmidi_free(struct snd_rawmidi *rmidi); 113 static void f_midi_free_inst(struct usb_function_instance *f); 114 115 DECLARE_UAC_AC_HEADER_DESCRIPTOR(1); 116 DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(1); 117 DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(16); 118 119 /* B.3.1 Standard AC Interface Descriptor */ 120 static struct usb_interface_descriptor ac_interface_desc = { 121 .bLength = USB_DT_INTERFACE_SIZE, 122 .bDescriptorType = USB_DT_INTERFACE, 123 /* .bInterfaceNumber = DYNAMIC */ 124 /* .bNumEndpoints = DYNAMIC */ 125 .bInterfaceClass = USB_CLASS_AUDIO, 126 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, 127 /* .iInterface = DYNAMIC */ 128 }; 129 130 /* B.3.2 Class-Specific AC Interface Descriptor */ 131 static struct uac1_ac_header_descriptor_1 ac_header_desc = { 132 .bLength = UAC_DT_AC_HEADER_SIZE(1), 133 .bDescriptorType = USB_DT_CS_INTERFACE, 134 .bDescriptorSubtype = USB_MS_HEADER, 135 .bcdADC = cpu_to_le16(0x0100), 136 .wTotalLength = cpu_to_le16(UAC_DT_AC_HEADER_SIZE(1)), 137 .bInCollection = 1, 138 /* .baInterfaceNr = DYNAMIC */ 139 }; 140 141 /* B.4.1 Standard MS Interface Descriptor */ 142 static struct usb_interface_descriptor ms_interface_desc = { 143 .bLength = USB_DT_INTERFACE_SIZE, 144 .bDescriptorType = USB_DT_INTERFACE, 145 /* .bInterfaceNumber = DYNAMIC */ 146 .bNumEndpoints = 2, 147 .bInterfaceClass = USB_CLASS_AUDIO, 148 .bInterfaceSubClass = USB_SUBCLASS_MIDISTREAMING, 149 /* .iInterface = DYNAMIC */ 150 }; 151 152 /* B.4.2 Class-Specific MS Interface Descriptor */ 153 static struct usb_ms_header_descriptor ms_header_desc = { 154 .bLength = USB_DT_MS_HEADER_SIZE, 155 .bDescriptorType = USB_DT_CS_INTERFACE, 156 .bDescriptorSubtype = USB_MS_HEADER, 157 .bcdMSC = cpu_to_le16(0x0100), 158 /* .wTotalLength = DYNAMIC */ 159 }; 160 161 /* B.5.1 Standard Bulk OUT Endpoint Descriptor */ 162 static struct usb_endpoint_descriptor bulk_out_desc = { 163 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, 164 .bDescriptorType = USB_DT_ENDPOINT, 165 .bEndpointAddress = USB_DIR_OUT, 166 .bmAttributes = USB_ENDPOINT_XFER_BULK, 167 }; 168 169 static struct usb_ss_ep_comp_descriptor bulk_out_ss_comp_desc = { 170 .bLength = sizeof(bulk_out_ss_comp_desc), 171 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 172 /* .bMaxBurst = 0, */ 173 /* .bmAttributes = 0, */ 174 }; 175 176 /* B.5.2 Class-specific MS Bulk OUT Endpoint Descriptor */ 177 static struct usb_ms_endpoint_descriptor_16 ms_out_desc = { 178 /* .bLength = DYNAMIC */ 179 .bDescriptorType = USB_DT_CS_ENDPOINT, 180 .bDescriptorSubtype = USB_MS_GENERAL, 181 /* .bNumEmbMIDIJack = DYNAMIC */ 182 /* .baAssocJackID = DYNAMIC */ 183 }; 184 185 /* B.6.1 Standard Bulk IN Endpoint Descriptor */ 186 static struct usb_endpoint_descriptor bulk_in_desc = { 187 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, 188 .bDescriptorType = USB_DT_ENDPOINT, 189 .bEndpointAddress = USB_DIR_IN, 190 .bmAttributes = USB_ENDPOINT_XFER_BULK, 191 }; 192 193 static struct usb_ss_ep_comp_descriptor bulk_in_ss_comp_desc = { 194 .bLength = sizeof(bulk_in_ss_comp_desc), 195 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 196 /* .bMaxBurst = 0, */ 197 /* .bmAttributes = 0, */ 198 }; 199 200 /* B.6.2 Class-specific MS Bulk IN Endpoint Descriptor */ 201 static struct usb_ms_endpoint_descriptor_16 ms_in_desc = { 202 /* .bLength = DYNAMIC */ 203 .bDescriptorType = USB_DT_CS_ENDPOINT, 204 .bDescriptorSubtype = USB_MS_GENERAL, 205 /* .bNumEmbMIDIJack = DYNAMIC */ 206 /* .baAssocJackID = DYNAMIC */ 207 }; 208 209 /* string IDs are assigned dynamically */ 210 211 #define STRING_FUNC_IDX 0 212 213 static struct usb_string midi_string_defs[] = { 214 [STRING_FUNC_IDX].s = "MIDI function", 215 { } /* end of list */ 216 }; 217 218 static struct usb_gadget_strings midi_stringtab = { 219 .language = 0x0409, /* en-us */ 220 .strings = midi_string_defs, 221 }; 222 223 static struct usb_gadget_strings *midi_strings[] = { 224 &midi_stringtab, 225 NULL, 226 }; 227 228 static inline struct usb_request *midi_alloc_ep_req(struct usb_ep *ep, 229 unsigned length) 230 { 231 return alloc_ep_req(ep, length); 232 } 233 234 static const uint8_t f_midi_cin_length[] = { 235 0, 0, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 2, 2, 3, 1 236 }; 237 238 /* 239 * Receives a chunk of MIDI data. 240 */ 241 static void f_midi_read_data(struct usb_ep *ep, int cable, 242 uint8_t *data, int length) 243 { 244 struct f_midi *midi = ep->driver_data; 245 struct snd_rawmidi_substream *substream = midi->out_substream[cable]; 246 247 if (!substream) 248 /* Nobody is listening - throw it on the floor. */ 249 return; 250 251 if (!test_bit(cable, &midi->out_triggered)) 252 return; 253 254 snd_rawmidi_receive(substream, data, length); 255 } 256 257 static void f_midi_handle_out_data(struct usb_ep *ep, struct usb_request *req) 258 { 259 unsigned int i; 260 u8 *buf = req->buf; 261 262 for (i = 0; i + 3 < req->actual; i += 4) 263 if (buf[i] != 0) { 264 int cable = buf[i] >> 4; 265 int length = f_midi_cin_length[buf[i] & 0x0f]; 266 f_midi_read_data(ep, cable, &buf[i + 1], length); 267 } 268 } 269 270 static void 271 f_midi_complete(struct usb_ep *ep, struct usb_request *req) 272 { 273 struct f_midi *midi = ep->driver_data; 274 struct usb_composite_dev *cdev = midi->func.config->cdev; 275 int status = req->status; 276 277 switch (status) { 278 case 0: /* normal completion */ 279 if (ep == midi->out_ep) { 280 /* We received stuff. req is queued again, below */ 281 f_midi_handle_out_data(ep, req); 282 } else if (ep == midi->in_ep) { 283 /* Our transmit completed. See if there's more to go. 284 * f_midi_transmit eats req, don't queue it again. */ 285 req->length = 0; 286 queue_work(system_highpri_wq, &midi->work); 287 return; 288 } 289 break; 290 291 /* this endpoint is normally active while we're configured */ 292 case -ECONNABORTED: /* hardware forced ep reset */ 293 case -ECONNRESET: /* request dequeued */ 294 case -ESHUTDOWN: /* disconnect from host */ 295 VDBG(cdev, "%s gone (%d), %d/%d\n", ep->name, status, 296 req->actual, req->length); 297 if (ep == midi->out_ep) { 298 f_midi_handle_out_data(ep, req); 299 /* We don't need to free IN requests because it's handled 300 * by the midi->in_req_fifo. */ 301 free_ep_req(ep, req); 302 } 303 return; 304 305 case -EOVERFLOW: /* buffer overrun on read means that 306 * we didn't provide a big enough buffer. 307 */ 308 default: 309 DBG(cdev, "%s complete --> %d, %d/%d\n", ep->name, 310 status, req->actual, req->length); 311 break; 312 case -EREMOTEIO: /* short read */ 313 break; 314 } 315 316 status = usb_ep_queue(ep, req, GFP_ATOMIC); 317 if (status) { 318 ERROR(cdev, "kill %s: resubmit %d bytes --> %d\n", 319 ep->name, req->length, status); 320 usb_ep_set_halt(ep); 321 /* FIXME recover later ... somehow */ 322 } 323 } 324 325 static void f_midi_drop_out_substreams(struct f_midi *midi) 326 { 327 unsigned int i; 328 329 for (i = 0; i < midi->in_ports; i++) { 330 struct gmidi_in_port *port = midi->in_ports_array + i; 331 struct snd_rawmidi_substream *substream = port->substream; 332 333 if (port->active && substream) 334 snd_rawmidi_drop_output(substream); 335 } 336 } 337 338 static int f_midi_start_ep(struct f_midi *midi, 339 struct usb_function *f, 340 struct usb_ep *ep) 341 { 342 int err; 343 struct usb_composite_dev *cdev = f->config->cdev; 344 345 usb_ep_disable(ep); 346 347 err = config_ep_by_speed(midi->gadget, f, ep); 348 if (err) { 349 ERROR(cdev, "can't configure %s: %d\n", ep->name, err); 350 return err; 351 } 352 353 err = usb_ep_enable(ep); 354 if (err) { 355 ERROR(cdev, "can't start %s: %d\n", ep->name, err); 356 return err; 357 } 358 359 ep->driver_data = midi; 360 361 return 0; 362 } 363 364 static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 365 { 366 struct f_midi *midi = func_to_midi(f); 367 unsigned i; 368 int err; 369 370 /* we only set alt for MIDIStreaming interface */ 371 if (intf != midi->ms_id) 372 return 0; 373 374 err = f_midi_start_ep(midi, f, midi->in_ep); 375 if (err) 376 return err; 377 378 err = f_midi_start_ep(midi, f, midi->out_ep); 379 if (err) 380 return err; 381 382 /* pre-allocate write usb requests to use on f_midi_transmit. */ 383 while (kfifo_avail(&midi->in_req_fifo)) { 384 struct usb_request *req = 385 midi_alloc_ep_req(midi->in_ep, midi->buflen); 386 387 if (req == NULL) 388 return -ENOMEM; 389 390 req->length = 0; 391 req->complete = f_midi_complete; 392 393 kfifo_put(&midi->in_req_fifo, req); 394 } 395 396 /* allocate a bunch of read buffers and queue them all at once. */ 397 for (i = 0; i < midi->qlen && err == 0; i++) { 398 struct usb_request *req = 399 midi_alloc_ep_req(midi->out_ep, midi->buflen); 400 401 if (req == NULL) 402 return -ENOMEM; 403 404 req->complete = f_midi_complete; 405 err = usb_ep_queue(midi->out_ep, req, GFP_ATOMIC); 406 if (err) { 407 ERROR(midi, "%s: couldn't enqueue request: %d\n", 408 midi->out_ep->name, err); 409 if (req->buf != NULL) 410 free_ep_req(midi->out_ep, req); 411 return err; 412 } 413 } 414 415 return 0; 416 } 417 418 static void f_midi_disable(struct usb_function *f) 419 { 420 struct f_midi *midi = func_to_midi(f); 421 struct usb_composite_dev *cdev = f->config->cdev; 422 struct usb_request *req = NULL; 423 424 DBG(cdev, "disable\n"); 425 426 /* 427 * just disable endpoints, forcing completion of pending i/o. 428 * all our completion handlers free their requests in this case. 429 */ 430 usb_ep_disable(midi->in_ep); 431 usb_ep_disable(midi->out_ep); 432 433 /* release IN requests */ 434 while (kfifo_get(&midi->in_req_fifo, &req)) 435 free_ep_req(midi->in_ep, req); 436 437 f_midi_drop_out_substreams(midi); 438 } 439 440 static int f_midi_snd_free(struct snd_device *device) 441 { 442 return 0; 443 } 444 445 /* 446 * Converts MIDI commands to USB MIDI packets. 447 */ 448 static void f_midi_transmit_byte(struct usb_request *req, 449 struct gmidi_in_port *port, uint8_t b) 450 { 451 uint8_t p[4] = { port->cable << 4, 0, 0, 0 }; 452 uint8_t next_state = STATE_INITIAL; 453 454 switch (b) { 455 case 0xf8 ... 0xff: 456 /* System Real-Time Messages */ 457 p[0] |= 0x0f; 458 p[1] = b; 459 next_state = port->state; 460 port->state = STATE_REAL_TIME; 461 break; 462 463 case 0xf7: 464 /* End of SysEx */ 465 switch (port->state) { 466 case STATE_SYSEX_0: 467 p[0] |= 0x05; 468 p[1] = 0xf7; 469 next_state = STATE_FINISHED; 470 break; 471 case STATE_SYSEX_1: 472 p[0] |= 0x06; 473 p[1] = port->data[0]; 474 p[2] = 0xf7; 475 next_state = STATE_FINISHED; 476 break; 477 case STATE_SYSEX_2: 478 p[0] |= 0x07; 479 p[1] = port->data[0]; 480 p[2] = port->data[1]; 481 p[3] = 0xf7; 482 next_state = STATE_FINISHED; 483 break; 484 default: 485 /* Ignore byte */ 486 next_state = port->state; 487 port->state = STATE_INITIAL; 488 } 489 break; 490 491 case 0xf0 ... 0xf6: 492 /* System Common Messages */ 493 port->data[0] = port->data[1] = 0; 494 port->state = STATE_INITIAL; 495 switch (b) { 496 case 0xf0: 497 port->data[0] = b; 498 port->data[1] = 0; 499 next_state = STATE_SYSEX_1; 500 break; 501 case 0xf1: 502 case 0xf3: 503 port->data[0] = b; 504 next_state = STATE_1PARAM; 505 break; 506 case 0xf2: 507 port->data[0] = b; 508 next_state = STATE_2PARAM_1; 509 break; 510 case 0xf4: 511 case 0xf5: 512 next_state = STATE_INITIAL; 513 break; 514 case 0xf6: 515 p[0] |= 0x05; 516 p[1] = 0xf6; 517 next_state = STATE_FINISHED; 518 break; 519 } 520 break; 521 522 case 0x80 ... 0xef: 523 /* 524 * Channel Voice Messages, Channel Mode Messages 525 * and Control Change Messages. 526 */ 527 port->data[0] = b; 528 port->data[1] = 0; 529 port->state = STATE_INITIAL; 530 if (b >= 0xc0 && b <= 0xdf) 531 next_state = STATE_1PARAM; 532 else 533 next_state = STATE_2PARAM_1; 534 break; 535 536 case 0x00 ... 0x7f: 537 /* Message parameters */ 538 switch (port->state) { 539 case STATE_1PARAM: 540 if (port->data[0] < 0xf0) 541 p[0] |= port->data[0] >> 4; 542 else 543 p[0] |= 0x02; 544 545 p[1] = port->data[0]; 546 p[2] = b; 547 /* This is to allow Running State Messages */ 548 next_state = STATE_1PARAM; 549 break; 550 case STATE_2PARAM_1: 551 port->data[1] = b; 552 next_state = STATE_2PARAM_2; 553 break; 554 case STATE_2PARAM_2: 555 if (port->data[0] < 0xf0) 556 p[0] |= port->data[0] >> 4; 557 else 558 p[0] |= 0x03; 559 560 p[1] = port->data[0]; 561 p[2] = port->data[1]; 562 p[3] = b; 563 /* This is to allow Running State Messages */ 564 next_state = STATE_2PARAM_1; 565 break; 566 case STATE_SYSEX_0: 567 port->data[0] = b; 568 next_state = STATE_SYSEX_1; 569 break; 570 case STATE_SYSEX_1: 571 port->data[1] = b; 572 next_state = STATE_SYSEX_2; 573 break; 574 case STATE_SYSEX_2: 575 p[0] |= 0x04; 576 p[1] = port->data[0]; 577 p[2] = port->data[1]; 578 p[3] = b; 579 next_state = STATE_SYSEX_0; 580 break; 581 } 582 break; 583 } 584 585 /* States where we have to write into the USB request */ 586 if (next_state == STATE_FINISHED || 587 port->state == STATE_SYSEX_2 || 588 port->state == STATE_1PARAM || 589 port->state == STATE_2PARAM_2 || 590 port->state == STATE_REAL_TIME) { 591 592 unsigned int length = req->length; 593 u8 *buf = (u8 *)req->buf + length; 594 595 memcpy(buf, p, sizeof(p)); 596 req->length = length + sizeof(p); 597 598 if (next_state == STATE_FINISHED) { 599 next_state = STATE_INITIAL; 600 port->data[0] = port->data[1] = 0; 601 } 602 } 603 604 port->state = next_state; 605 } 606 607 static int f_midi_do_transmit(struct f_midi *midi, struct usb_ep *ep) 608 { 609 struct usb_request *req = NULL; 610 unsigned int len, i; 611 bool active = false; 612 int err; 613 614 /* 615 * We peek the request in order to reuse it if it fails to enqueue on 616 * its endpoint 617 */ 618 len = kfifo_peek(&midi->in_req_fifo, &req); 619 if (len != 1) { 620 ERROR(midi, "%s: Couldn't get usb request\n", __func__); 621 return -1; 622 } 623 624 /* 625 * If buffer overrun, then we ignore this transmission. 626 * IMPORTANT: This will cause the user-space rawmidi device to block 627 * until a) usb requests have been completed or b) snd_rawmidi_write() 628 * times out. 629 */ 630 if (req->length > 0) 631 return 0; 632 633 for (i = midi->in_last_port; i < midi->in_ports; ++i) { 634 struct gmidi_in_port *port = midi->in_ports_array + i; 635 struct snd_rawmidi_substream *substream = port->substream; 636 637 if (!port->active || !substream) 638 continue; 639 640 while (req->length + 3 < midi->buflen) { 641 uint8_t b; 642 643 if (snd_rawmidi_transmit(substream, &b, 1) != 1) { 644 port->active = 0; 645 break; 646 } 647 f_midi_transmit_byte(req, port, b); 648 } 649 650 active = !!port->active; 651 if (active) 652 break; 653 } 654 midi->in_last_port = active ? i : 0; 655 656 if (req->length <= 0) 657 goto done; 658 659 err = usb_ep_queue(ep, req, GFP_ATOMIC); 660 if (err < 0) { 661 ERROR(midi, "%s failed to queue req: %d\n", 662 midi->in_ep->name, err); 663 req->length = 0; /* Re-use request next time. */ 664 } else { 665 /* Upon success, put request at the back of the queue. */ 666 kfifo_skip(&midi->in_req_fifo); 667 kfifo_put(&midi->in_req_fifo, req); 668 } 669 670 done: 671 return active; 672 } 673 674 static void f_midi_transmit(struct f_midi *midi) 675 { 676 struct usb_ep *ep = midi->in_ep; 677 int ret; 678 unsigned long flags; 679 680 /* We only care about USB requests if IN endpoint is enabled */ 681 if (!ep || !ep->enabled) 682 goto drop_out; 683 684 spin_lock_irqsave(&midi->transmit_lock, flags); 685 686 do { 687 ret = f_midi_do_transmit(midi, ep); 688 if (ret < 0) { 689 spin_unlock_irqrestore(&midi->transmit_lock, flags); 690 goto drop_out; 691 } 692 } while (ret); 693 694 spin_unlock_irqrestore(&midi->transmit_lock, flags); 695 696 return; 697 698 drop_out: 699 f_midi_drop_out_substreams(midi); 700 } 701 702 static void f_midi_in_work(struct work_struct *work) 703 { 704 struct f_midi *midi; 705 706 midi = container_of(work, struct f_midi, work); 707 f_midi_transmit(midi); 708 } 709 710 static int f_midi_in_open(struct snd_rawmidi_substream *substream) 711 { 712 struct f_midi *midi = substream->rmidi->private_data; 713 struct gmidi_in_port *port; 714 715 if (substream->number >= midi->in_ports) 716 return -EINVAL; 717 718 VDBG(midi, "%s()\n", __func__); 719 port = midi->in_ports_array + substream->number; 720 port->substream = substream; 721 port->state = STATE_INITIAL; 722 return 0; 723 } 724 725 static int f_midi_in_close(struct snd_rawmidi_substream *substream) 726 { 727 struct f_midi *midi = substream->rmidi->private_data; 728 729 VDBG(midi, "%s()\n", __func__); 730 return 0; 731 } 732 733 static void f_midi_in_trigger(struct snd_rawmidi_substream *substream, int up) 734 { 735 struct f_midi *midi = substream->rmidi->private_data; 736 737 if (substream->number >= midi->in_ports) 738 return; 739 740 VDBG(midi, "%s() %d\n", __func__, up); 741 midi->in_ports_array[substream->number].active = up; 742 if (up) 743 queue_work(system_highpri_wq, &midi->work); 744 } 745 746 static int f_midi_out_open(struct snd_rawmidi_substream *substream) 747 { 748 struct f_midi *midi = substream->rmidi->private_data; 749 750 if (substream->number >= MAX_PORTS) 751 return -EINVAL; 752 753 VDBG(midi, "%s()\n", __func__); 754 midi->out_substream[substream->number] = substream; 755 return 0; 756 } 757 758 static int f_midi_out_close(struct snd_rawmidi_substream *substream) 759 { 760 struct f_midi *midi = substream->rmidi->private_data; 761 762 VDBG(midi, "%s()\n", __func__); 763 return 0; 764 } 765 766 static void f_midi_out_trigger(struct snd_rawmidi_substream *substream, int up) 767 { 768 struct f_midi *midi = substream->rmidi->private_data; 769 770 VDBG(midi, "%s()\n", __func__); 771 772 if (up) 773 set_bit(substream->number, &midi->out_triggered); 774 else 775 clear_bit(substream->number, &midi->out_triggered); 776 } 777 778 static const struct snd_rawmidi_ops gmidi_in_ops = { 779 .open = f_midi_in_open, 780 .close = f_midi_in_close, 781 .trigger = f_midi_in_trigger, 782 }; 783 784 static const struct snd_rawmidi_ops gmidi_out_ops = { 785 .open = f_midi_out_open, 786 .close = f_midi_out_close, 787 .trigger = f_midi_out_trigger 788 }; 789 790 static inline void f_midi_unregister_card(struct f_midi *midi) 791 { 792 if (midi->card) { 793 snd_card_free(midi->card); 794 midi->card = NULL; 795 } 796 } 797 798 /* register as a sound "card" */ 799 static int f_midi_register_card(struct f_midi *midi) 800 { 801 struct snd_card *card; 802 struct snd_rawmidi *rmidi; 803 int err; 804 static struct snd_device_ops ops = { 805 .dev_free = f_midi_snd_free, 806 }; 807 808 err = snd_card_new(&midi->gadget->dev, midi->index, midi->id, 809 THIS_MODULE, 0, &card); 810 if (err < 0) { 811 ERROR(midi, "snd_card_new() failed\n"); 812 goto fail; 813 } 814 midi->card = card; 815 816 err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, midi, &ops); 817 if (err < 0) { 818 ERROR(midi, "snd_device_new() failed: error %d\n", err); 819 goto fail; 820 } 821 822 strscpy(card->driver, f_midi_longname); 823 strscpy(card->longname, f_midi_longname); 824 strscpy(card->shortname, f_midi_shortname); 825 826 /* Set up rawmidi */ 827 snd_component_add(card, "MIDI"); 828 err = snd_rawmidi_new(card, card->longname, 0, 829 midi->out_ports, midi->in_ports, &rmidi); 830 if (err < 0) { 831 ERROR(midi, "snd_rawmidi_new() failed: error %d\n", err); 832 goto fail; 833 } 834 midi->rmidi = rmidi; 835 midi->in_last_port = 0; 836 strscpy(rmidi->name, card->shortname); 837 rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT | 838 SNDRV_RAWMIDI_INFO_INPUT | 839 SNDRV_RAWMIDI_INFO_DUPLEX; 840 rmidi->private_data = midi; 841 rmidi->private_free = f_midi_rmidi_free; 842 midi->free_ref++; 843 844 /* 845 * Yes, rawmidi OUTPUT = USB IN, and rawmidi INPUT = USB OUT. 846 * It's an upside-down world being a gadget. 847 */ 848 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &gmidi_in_ops); 849 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &gmidi_out_ops); 850 851 /* register it - we're ready to go */ 852 err = snd_card_register(card); 853 if (err < 0) { 854 ERROR(midi, "snd_card_register() failed\n"); 855 goto fail; 856 } 857 858 VDBG(midi, "%s() finished ok\n", __func__); 859 return 0; 860 861 fail: 862 f_midi_unregister_card(midi); 863 return err; 864 } 865 866 /* MIDI function driver setup/binding */ 867 868 static int f_midi_bind(struct usb_configuration *c, struct usb_function *f) 869 { 870 struct usb_descriptor_header **midi_function; 871 struct usb_midi_in_jack_descriptor jack_in_ext_desc[MAX_PORTS]; 872 struct usb_midi_in_jack_descriptor jack_in_emb_desc[MAX_PORTS]; 873 struct usb_midi_out_jack_descriptor_1 jack_out_ext_desc[MAX_PORTS]; 874 struct usb_midi_out_jack_descriptor_1 jack_out_emb_desc[MAX_PORTS]; 875 struct usb_composite_dev *cdev = c->cdev; 876 struct f_midi *midi = func_to_midi(f); 877 struct usb_string *us; 878 int status, n, jack = 1, i = 0, endpoint_descriptor_index = 0; 879 880 midi->gadget = cdev->gadget; 881 INIT_WORK(&midi->work, f_midi_in_work); 882 status = f_midi_register_card(midi); 883 if (status < 0) 884 goto fail_register; 885 886 /* maybe allocate device-global string ID */ 887 us = usb_gstrings_attach(c->cdev, midi_strings, 888 ARRAY_SIZE(midi_string_defs)); 889 if (IS_ERR(us)) { 890 status = PTR_ERR(us); 891 goto fail; 892 } 893 ac_interface_desc.iInterface = us[STRING_FUNC_IDX].id; 894 895 /* We have two interfaces, AudioControl and MIDIStreaming */ 896 status = usb_interface_id(c, f); 897 if (status < 0) 898 goto fail; 899 ac_interface_desc.bInterfaceNumber = status; 900 901 status = usb_interface_id(c, f); 902 if (status < 0) 903 goto fail; 904 ms_interface_desc.bInterfaceNumber = status; 905 ac_header_desc.baInterfaceNr[0] = status; 906 midi->ms_id = status; 907 908 status = -ENODEV; 909 910 /* 911 * Reset wMaxPacketSize with maximum packet size of FS bulk transfer before 912 * endpoint claim. This ensures that the wMaxPacketSize does not exceed the 913 * limit during bind retries where configured dwc3 TX/RX FIFO's maxpacket 914 * size of 512 bytes for IN/OUT endpoints in support HS speed only. 915 */ 916 bulk_in_desc.wMaxPacketSize = cpu_to_le16(64); 917 bulk_out_desc.wMaxPacketSize = cpu_to_le16(64); 918 919 /* allocate instance-specific endpoints */ 920 midi->in_ep = usb_ep_autoconfig(cdev->gadget, &bulk_in_desc); 921 if (!midi->in_ep) 922 goto fail; 923 924 midi->out_ep = usb_ep_autoconfig(cdev->gadget, &bulk_out_desc); 925 if (!midi->out_ep) 926 goto fail; 927 928 /* allocate temporary function list */ 929 midi_function = kcalloc((MAX_PORTS * 4) + 11, sizeof(*midi_function), 930 GFP_KERNEL); 931 if (!midi_function) { 932 status = -ENOMEM; 933 goto fail; 934 } 935 936 /* 937 * construct the function's descriptor set. As the number of 938 * input and output MIDI ports is configurable, we have to do 939 * it that way. 940 */ 941 942 /* add the headers - these are always the same */ 943 midi_function[i++] = (struct usb_descriptor_header *) &ac_interface_desc; 944 midi_function[i++] = (struct usb_descriptor_header *) &ac_header_desc; 945 midi_function[i++] = (struct usb_descriptor_header *) &ms_interface_desc; 946 947 /* calculate the header's wTotalLength */ 948 n = USB_DT_MS_HEADER_SIZE 949 + (midi->in_ports + midi->out_ports) * 950 (USB_DT_MIDI_IN_SIZE + USB_DT_MIDI_OUT_SIZE(1)); 951 ms_header_desc.wTotalLength = cpu_to_le16(n); 952 953 midi_function[i++] = (struct usb_descriptor_header *) &ms_header_desc; 954 955 /* configure the external IN jacks, each linked to an embedded OUT jack */ 956 for (n = 0; n < midi->in_ports; n++) { 957 struct usb_midi_in_jack_descriptor *in_ext = &jack_in_ext_desc[n]; 958 struct usb_midi_out_jack_descriptor_1 *out_emb = &jack_out_emb_desc[n]; 959 960 in_ext->bLength = USB_DT_MIDI_IN_SIZE; 961 in_ext->bDescriptorType = USB_DT_CS_INTERFACE; 962 in_ext->bDescriptorSubtype = USB_MS_MIDI_IN_JACK; 963 in_ext->bJackType = USB_MS_EXTERNAL; 964 in_ext->bJackID = jack++; 965 in_ext->iJack = 0; 966 midi_function[i++] = (struct usb_descriptor_header *) in_ext; 967 968 out_emb->bLength = USB_DT_MIDI_OUT_SIZE(1); 969 out_emb->bDescriptorType = USB_DT_CS_INTERFACE; 970 out_emb->bDescriptorSubtype = USB_MS_MIDI_OUT_JACK; 971 out_emb->bJackType = USB_MS_EMBEDDED; 972 out_emb->bJackID = jack++; 973 out_emb->bNrInputPins = 1; 974 out_emb->pins[0].baSourcePin = 1; 975 out_emb->pins[0].baSourceID = in_ext->bJackID; 976 out_emb->iJack = 0; 977 midi_function[i++] = (struct usb_descriptor_header *) out_emb; 978 979 /* link it to the endpoint */ 980 ms_in_desc.baAssocJackID[n] = out_emb->bJackID; 981 } 982 983 /* configure the external OUT jacks, each linked to an embedded IN jack */ 984 for (n = 0; n < midi->out_ports; n++) { 985 struct usb_midi_in_jack_descriptor *in_emb = &jack_in_emb_desc[n]; 986 struct usb_midi_out_jack_descriptor_1 *out_ext = &jack_out_ext_desc[n]; 987 988 in_emb->bLength = USB_DT_MIDI_IN_SIZE; 989 in_emb->bDescriptorType = USB_DT_CS_INTERFACE; 990 in_emb->bDescriptorSubtype = USB_MS_MIDI_IN_JACK; 991 in_emb->bJackType = USB_MS_EMBEDDED; 992 in_emb->bJackID = jack++; 993 in_emb->iJack = 0; 994 midi_function[i++] = (struct usb_descriptor_header *) in_emb; 995 996 out_ext->bLength = USB_DT_MIDI_OUT_SIZE(1); 997 out_ext->bDescriptorType = USB_DT_CS_INTERFACE; 998 out_ext->bDescriptorSubtype = USB_MS_MIDI_OUT_JACK; 999 out_ext->bJackType = USB_MS_EXTERNAL; 1000 out_ext->bJackID = jack++; 1001 out_ext->bNrInputPins = 1; 1002 out_ext->iJack = 0; 1003 out_ext->pins[0].baSourceID = in_emb->bJackID; 1004 out_ext->pins[0].baSourcePin = 1; 1005 midi_function[i++] = (struct usb_descriptor_header *) out_ext; 1006 1007 /* link it to the endpoint */ 1008 ms_out_desc.baAssocJackID[n] = in_emb->bJackID; 1009 } 1010 1011 /* configure the endpoint descriptors ... */ 1012 ms_out_desc.bLength = USB_DT_MS_ENDPOINT_SIZE(midi->out_ports); 1013 ms_out_desc.bNumEmbMIDIJack = midi->out_ports; 1014 1015 ms_in_desc.bLength = USB_DT_MS_ENDPOINT_SIZE(midi->in_ports); 1016 ms_in_desc.bNumEmbMIDIJack = midi->in_ports; 1017 1018 /* ... and add them to the list */ 1019 endpoint_descriptor_index = i; 1020 midi_function[i++] = (struct usb_descriptor_header *) &bulk_out_desc; 1021 midi_function[i++] = (struct usb_descriptor_header *) &ms_out_desc; 1022 midi_function[i++] = (struct usb_descriptor_header *) &bulk_in_desc; 1023 midi_function[i++] = (struct usb_descriptor_header *) &ms_in_desc; 1024 midi_function[i++] = NULL; 1025 1026 /* 1027 * support all relevant hardware speeds... we expect that when 1028 * hardware is dual speed, all bulk-capable endpoints work at 1029 * both speeds 1030 */ 1031 /* copy descriptors, and track endpoint copies */ 1032 f->fs_descriptors = usb_copy_descriptors(midi_function); 1033 if (!f->fs_descriptors) 1034 goto fail_f_midi; 1035 1036 bulk_in_desc.wMaxPacketSize = cpu_to_le16(512); 1037 bulk_out_desc.wMaxPacketSize = cpu_to_le16(512); 1038 f->hs_descriptors = usb_copy_descriptors(midi_function); 1039 if (!f->hs_descriptors) 1040 goto fail_f_midi; 1041 1042 bulk_in_desc.wMaxPacketSize = cpu_to_le16(1024); 1043 bulk_out_desc.wMaxPacketSize = cpu_to_le16(1024); 1044 i = endpoint_descriptor_index; 1045 midi_function[i++] = (struct usb_descriptor_header *) 1046 &bulk_out_desc; 1047 midi_function[i++] = (struct usb_descriptor_header *) 1048 &bulk_out_ss_comp_desc; 1049 midi_function[i++] = (struct usb_descriptor_header *) 1050 &ms_out_desc; 1051 midi_function[i++] = (struct usb_descriptor_header *) 1052 &bulk_in_desc; 1053 midi_function[i++] = (struct usb_descriptor_header *) 1054 &bulk_in_ss_comp_desc; 1055 midi_function[i++] = (struct usb_descriptor_header *) 1056 &ms_in_desc; 1057 f->ss_descriptors = usb_copy_descriptors(midi_function); 1058 if (!f->ss_descriptors) 1059 goto fail_f_midi; 1060 1061 kfree(midi_function); 1062 1063 return 0; 1064 1065 fail_f_midi: 1066 kfree(midi_function); 1067 usb_free_all_descriptors(f); 1068 fail: 1069 f_midi_unregister_card(midi); 1070 fail_register: 1071 ERROR(cdev, "%s: can't bind, err %d\n", f->name, status); 1072 1073 return status; 1074 } 1075 1076 static inline struct f_midi_opts *to_f_midi_opts(struct config_item *item) 1077 { 1078 return container_of(to_config_group(item), struct f_midi_opts, 1079 func_inst.group); 1080 } 1081 1082 static void midi_attr_release(struct config_item *item) 1083 { 1084 struct f_midi_opts *opts = to_f_midi_opts(item); 1085 1086 usb_put_function_instance(&opts->func_inst); 1087 } 1088 1089 static struct configfs_item_operations midi_item_ops = { 1090 .release = midi_attr_release, 1091 }; 1092 1093 #define F_MIDI_OPT(name, test_limit, limit) \ 1094 static ssize_t f_midi_opts_##name##_show(struct config_item *item, char *page) \ 1095 { \ 1096 struct f_midi_opts *opts = to_f_midi_opts(item); \ 1097 int result; \ 1098 \ 1099 mutex_lock(&opts->lock); \ 1100 result = sprintf(page, "%u\n", opts->name); \ 1101 mutex_unlock(&opts->lock); \ 1102 \ 1103 return result; \ 1104 } \ 1105 \ 1106 static ssize_t f_midi_opts_##name##_store(struct config_item *item, \ 1107 const char *page, size_t len) \ 1108 { \ 1109 struct f_midi_opts *opts = to_f_midi_opts(item); \ 1110 int ret; \ 1111 u32 num; \ 1112 \ 1113 mutex_lock(&opts->lock); \ 1114 if (opts->refcnt > 1) { \ 1115 ret = -EBUSY; \ 1116 goto end; \ 1117 } \ 1118 \ 1119 ret = kstrtou32(page, 0, &num); \ 1120 if (ret) \ 1121 goto end; \ 1122 \ 1123 if (test_limit && num > limit) { \ 1124 ret = -EINVAL; \ 1125 goto end; \ 1126 } \ 1127 opts->name = num; \ 1128 ret = len; \ 1129 \ 1130 end: \ 1131 mutex_unlock(&opts->lock); \ 1132 return ret; \ 1133 } \ 1134 \ 1135 CONFIGFS_ATTR(f_midi_opts_, name); 1136 1137 #define F_MIDI_OPT_SIGNED(name, test_limit, limit) \ 1138 static ssize_t f_midi_opts_##name##_show(struct config_item *item, char *page) \ 1139 { \ 1140 struct f_midi_opts *opts = to_f_midi_opts(item); \ 1141 int result; \ 1142 \ 1143 mutex_lock(&opts->lock); \ 1144 result = sprintf(page, "%d\n", opts->name); \ 1145 mutex_unlock(&opts->lock); \ 1146 \ 1147 return result; \ 1148 } \ 1149 \ 1150 static ssize_t f_midi_opts_##name##_store(struct config_item *item, \ 1151 const char *page, size_t len) \ 1152 { \ 1153 struct f_midi_opts *opts = to_f_midi_opts(item); \ 1154 int ret; \ 1155 s32 num; \ 1156 \ 1157 mutex_lock(&opts->lock); \ 1158 if (opts->refcnt > 1) { \ 1159 ret = -EBUSY; \ 1160 goto end; \ 1161 } \ 1162 \ 1163 ret = kstrtos32(page, 0, &num); \ 1164 if (ret) \ 1165 goto end; \ 1166 \ 1167 if (test_limit && num > limit) { \ 1168 ret = -EINVAL; \ 1169 goto end; \ 1170 } \ 1171 opts->name = num; \ 1172 ret = len; \ 1173 \ 1174 end: \ 1175 mutex_unlock(&opts->lock); \ 1176 return ret; \ 1177 } \ 1178 \ 1179 CONFIGFS_ATTR(f_midi_opts_, name); 1180 1181 F_MIDI_OPT_SIGNED(index, true, SNDRV_CARDS); 1182 F_MIDI_OPT(buflen, false, 0); 1183 F_MIDI_OPT(qlen, false, 0); 1184 F_MIDI_OPT(in_ports, true, MAX_PORTS); 1185 F_MIDI_OPT(out_ports, true, MAX_PORTS); 1186 1187 static ssize_t f_midi_opts_id_show(struct config_item *item, char *page) 1188 { 1189 struct f_midi_opts *opts = to_f_midi_opts(item); 1190 ssize_t result; 1191 1192 mutex_lock(&opts->lock); 1193 if (opts->id) { 1194 result = strscpy(page, opts->id, PAGE_SIZE); 1195 } else { 1196 page[0] = 0; 1197 result = 0; 1198 } 1199 1200 mutex_unlock(&opts->lock); 1201 1202 return result; 1203 } 1204 1205 static ssize_t f_midi_opts_id_store(struct config_item *item, 1206 const char *page, size_t len) 1207 { 1208 struct f_midi_opts *opts = to_f_midi_opts(item); 1209 int ret; 1210 char *c; 1211 1212 mutex_lock(&opts->lock); 1213 if (opts->refcnt > 1) { 1214 ret = -EBUSY; 1215 goto end; 1216 } 1217 1218 c = kstrndup(page, len, GFP_KERNEL); 1219 if (!c) { 1220 ret = -ENOMEM; 1221 goto end; 1222 } 1223 if (opts->id_allocated) 1224 kfree(opts->id); 1225 opts->id = c; 1226 opts->id_allocated = true; 1227 ret = len; 1228 end: 1229 mutex_unlock(&opts->lock); 1230 return ret; 1231 } 1232 1233 CONFIGFS_ATTR(f_midi_opts_, id); 1234 1235 static struct configfs_attribute *midi_attrs[] = { 1236 &f_midi_opts_attr_index, 1237 &f_midi_opts_attr_buflen, 1238 &f_midi_opts_attr_qlen, 1239 &f_midi_opts_attr_in_ports, 1240 &f_midi_opts_attr_out_ports, 1241 &f_midi_opts_attr_id, 1242 NULL, 1243 }; 1244 1245 static const struct config_item_type midi_func_type = { 1246 .ct_item_ops = &midi_item_ops, 1247 .ct_attrs = midi_attrs, 1248 .ct_owner = THIS_MODULE, 1249 }; 1250 1251 static void f_midi_free_inst(struct usb_function_instance *f) 1252 { 1253 struct f_midi_opts *opts; 1254 bool free = false; 1255 1256 opts = container_of(f, struct f_midi_opts, func_inst); 1257 1258 mutex_lock(&opts->lock); 1259 if (!--opts->refcnt) { 1260 free = true; 1261 } 1262 mutex_unlock(&opts->lock); 1263 1264 if (free) { 1265 if (opts->id_allocated) 1266 kfree(opts->id); 1267 kfree(opts); 1268 } 1269 } 1270 1271 static struct usb_function_instance *f_midi_alloc_inst(void) 1272 { 1273 struct f_midi_opts *opts; 1274 1275 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 1276 if (!opts) 1277 return ERR_PTR(-ENOMEM); 1278 1279 mutex_init(&opts->lock); 1280 opts->func_inst.free_func_inst = f_midi_free_inst; 1281 opts->index = SNDRV_DEFAULT_IDX1; 1282 opts->id = SNDRV_DEFAULT_STR1; 1283 opts->buflen = 512; 1284 opts->qlen = 32; 1285 opts->in_ports = 1; 1286 opts->out_ports = 1; 1287 opts->refcnt = 1; 1288 1289 config_group_init_type_name(&opts->func_inst.group, "", 1290 &midi_func_type); 1291 1292 return &opts->func_inst; 1293 } 1294 1295 static void f_midi_free(struct usb_function *f) 1296 { 1297 struct f_midi *midi; 1298 struct f_midi_opts *opts; 1299 bool free = false; 1300 1301 midi = func_to_midi(f); 1302 opts = container_of(f->fi, struct f_midi_opts, func_inst); 1303 mutex_lock(&opts->lock); 1304 if (!--midi->free_ref) { 1305 kfree(midi->id); 1306 kfifo_free(&midi->in_req_fifo); 1307 kfree(midi); 1308 free = true; 1309 } 1310 mutex_unlock(&opts->lock); 1311 1312 if (free) 1313 f_midi_free_inst(&opts->func_inst); 1314 } 1315 1316 static void f_midi_rmidi_free(struct snd_rawmidi *rmidi) 1317 { 1318 f_midi_free(rmidi->private_data); 1319 } 1320 1321 static void f_midi_unbind(struct usb_configuration *c, struct usb_function *f) 1322 { 1323 struct usb_composite_dev *cdev = f->config->cdev; 1324 struct f_midi *midi = func_to_midi(f); 1325 struct snd_card *card; 1326 1327 DBG(cdev, "unbind\n"); 1328 1329 /* just to be sure */ 1330 f_midi_disable(f); 1331 1332 card = midi->card; 1333 midi->card = NULL; 1334 if (card) 1335 snd_card_free_when_closed(card); 1336 1337 usb_free_all_descriptors(f); 1338 } 1339 1340 static struct usb_function *f_midi_alloc(struct usb_function_instance *fi) 1341 { 1342 struct f_midi *midi = NULL; 1343 struct f_midi_opts *opts; 1344 int status, i; 1345 1346 opts = container_of(fi, struct f_midi_opts, func_inst); 1347 1348 mutex_lock(&opts->lock); 1349 /* sanity check */ 1350 if (opts->in_ports > MAX_PORTS || opts->out_ports > MAX_PORTS) { 1351 status = -EINVAL; 1352 goto setup_fail; 1353 } 1354 1355 /* allocate and initialize one new instance */ 1356 midi = kzalloc(struct_size(midi, in_ports_array, opts->in_ports), 1357 GFP_KERNEL); 1358 if (!midi) { 1359 status = -ENOMEM; 1360 goto setup_fail; 1361 } 1362 midi->in_ports = opts->in_ports; 1363 1364 for (i = 0; i < opts->in_ports; i++) 1365 midi->in_ports_array[i].cable = i; 1366 1367 /* set up ALSA midi devices */ 1368 midi->id = kstrdup(opts->id, GFP_KERNEL); 1369 if (opts->id && !midi->id) { 1370 status = -ENOMEM; 1371 goto midi_free; 1372 } 1373 midi->out_ports = opts->out_ports; 1374 midi->index = opts->index; 1375 midi->buflen = opts->buflen; 1376 midi->qlen = opts->qlen; 1377 midi->in_last_port = 0; 1378 midi->free_ref = 1; 1379 1380 status = kfifo_alloc(&midi->in_req_fifo, midi->qlen, GFP_KERNEL); 1381 if (status) 1382 goto midi_free; 1383 1384 spin_lock_init(&midi->transmit_lock); 1385 1386 ++opts->refcnt; 1387 mutex_unlock(&opts->lock); 1388 1389 midi->func.name = "gmidi function"; 1390 midi->func.bind = f_midi_bind; 1391 midi->func.unbind = f_midi_unbind; 1392 midi->func.set_alt = f_midi_set_alt; 1393 midi->func.disable = f_midi_disable; 1394 midi->func.free_func = f_midi_free; 1395 1396 return &midi->func; 1397 1398 midi_free: 1399 if (midi) 1400 kfree(midi->id); 1401 kfree(midi); 1402 setup_fail: 1403 mutex_unlock(&opts->lock); 1404 1405 return ERR_PTR(status); 1406 } 1407 1408 DECLARE_USB_FUNCTION_INIT(midi, f_midi_alloc_inst, f_midi_alloc); 1409