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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> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/utsname.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 | MODULE_AUTHOR("Ben Williamson"); | |
37 | MODULE_LICENSE("GPL v2"); | |
38 | ||
39 | static const char f_midi_shortname[] = "f_midi"; | |
40 | static const char f_midi_longname[] = "MIDI Gadget"; | |
41 | ||
42 | /* | |
43 | * This is a gadget, and the IN/OUT naming is from the host's perspective. | |
44 | * USB -> OUT endpoint -> rawmidi | |
45 | * USB <- IN endpoint <- rawmidi | |
46 | */ | |
47 | struct gmidi_in_port { | |
48 | struct f_midi *midi; | |
49 | int active; | |
50 | uint8_t cable; /* cable number << 4 */ | |
51 | uint8_t state; | |
52 | #define STATE_UNKNOWN 0 | |
53 | #define STATE_1PARAM 1 | |
54 | #define STATE_2PARAM_1 2 | |
55 | #define STATE_2PARAM_2 3 | |
56 | #define STATE_SYSEX_0 4 | |
57 | #define STATE_SYSEX_1 5 | |
58 | #define STATE_SYSEX_2 6 | |
59 | uint8_t data[2]; | |
60 | }; | |
61 | ||
62 | struct f_midi { | |
63 | struct usb_function func; | |
64 | struct usb_gadget *gadget; | |
65 | struct usb_ep *in_ep, *out_ep; | |
66 | struct snd_card *card; | |
67 | struct snd_rawmidi *rmidi; | |
68 | struct snd_rawmidi_substream *in_substream; | |
69 | struct snd_rawmidi_substream *out_substream; | |
70 | ||
71 | /* For the moment we only support one port in | |
72 | each direction, but in_port is kept as a | |
73 | separate struct so we can have more later. */ | |
74 | struct gmidi_in_port in_port; | |
75 | unsigned long out_triggered; | |
76 | struct tasklet_struct tasklet; | |
77 | int index; | |
78 | char *id; | |
79 | unsigned int buflen, qlen; | |
80 | }; | |
81 | ||
82 | static inline struct f_midi *func_to_midi(struct usb_function *f) | |
83 | { | |
84 | return container_of(f, struct f_midi, func); | |
85 | } | |
86 | ||
87 | static void f_midi_transmit(struct f_midi *midi, struct usb_request *req); | |
88 | ||
89 | DECLARE_UAC_AC_HEADER_DESCRIPTOR(1); | |
90 | DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(1); | |
91 | DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(1); | |
92 | ||
93 | /* B.3.1 Standard AC Interface Descriptor */ | |
94 | static struct usb_interface_descriptor ac_interface_desc __initdata = { | |
95 | .bLength = USB_DT_INTERFACE_SIZE, | |
96 | .bDescriptorType = USB_DT_INTERFACE, | |
97 | /* .bInterfaceNumber = DYNAMIC */ | |
98 | /* .bNumEndpoints = DYNAMIC */ | |
99 | .bInterfaceClass = USB_CLASS_AUDIO, | |
100 | .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, | |
101 | /* .iInterface = DYNAMIC */ | |
102 | }; | |
103 | ||
104 | /* B.3.2 Class-Specific AC Interface Descriptor */ | |
105 | static struct uac1_ac_header_descriptor_1 ac_header_desc __initdata = { | |
106 | .bLength = UAC_DT_AC_HEADER_SIZE(1), | |
107 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
108 | .bDescriptorSubtype = USB_MS_HEADER, | |
109 | .bcdADC = cpu_to_le16(0x0100), | |
110 | .wTotalLength = cpu_to_le16(UAC_DT_AC_HEADER_SIZE(1)), | |
111 | .bInCollection = 1, | |
112 | /* .baInterfaceNr = DYNAMIC */ | |
113 | }; | |
114 | ||
115 | /* B.4.1 Standard MS Interface Descriptor */ | |
116 | static struct usb_interface_descriptor ms_interface_desc __initdata = { | |
117 | .bLength = USB_DT_INTERFACE_SIZE, | |
118 | .bDescriptorType = USB_DT_INTERFACE, | |
119 | /* .bInterfaceNumber = DYNAMIC */ | |
120 | .bNumEndpoints = 2, | |
121 | .bInterfaceClass = USB_CLASS_AUDIO, | |
122 | .bInterfaceSubClass = USB_SUBCLASS_MIDISTREAMING, | |
123 | /* .iInterface = DYNAMIC */ | |
124 | }; | |
125 | ||
126 | /* B.4.2 Class-Specific MS Interface Descriptor */ | |
127 | static struct usb_ms_header_descriptor ms_header_desc __initdata = { | |
128 | .bLength = USB_DT_MS_HEADER_SIZE, | |
129 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
130 | .bDescriptorSubtype = USB_MS_HEADER, | |
131 | .bcdMSC = cpu_to_le16(0x0100), | |
132 | .wTotalLength = cpu_to_le16(USB_DT_MS_HEADER_SIZE | |
133 | + 2*USB_DT_MIDI_IN_SIZE | |
134 | + 2*USB_DT_MIDI_OUT_SIZE(1)), | |
135 | }; | |
136 | ||
137 | #define JACK_IN_EMB 1 | |
138 | #define JACK_IN_EXT 2 | |
139 | #define JACK_OUT_EMB 3 | |
140 | #define JACK_OUT_EXT 4 | |
141 | ||
142 | /* B.4.3 MIDI IN Jack Descriptors */ | |
143 | static const struct usb_midi_in_jack_descriptor jack_in_emb_desc = { | |
144 | .bLength = USB_DT_MIDI_IN_SIZE, | |
145 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
146 | .bDescriptorSubtype = USB_MS_MIDI_IN_JACK, | |
147 | .bJackType = USB_MS_EMBEDDED, | |
148 | .bJackID = JACK_IN_EMB, | |
149 | }; | |
150 | ||
151 | static const struct usb_midi_in_jack_descriptor jack_in_ext_desc = { | |
152 | .bLength = USB_DT_MIDI_IN_SIZE, | |
153 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
154 | .bDescriptorSubtype = USB_MS_MIDI_IN_JACK, | |
155 | .bJackType = USB_MS_EXTERNAL, | |
156 | .bJackID = JACK_IN_EXT, | |
157 | }; | |
158 | ||
159 | /* B.4.4 MIDI OUT Jack Descriptors */ | |
160 | static const struct usb_midi_out_jack_descriptor_1 jack_out_emb_desc = { | |
161 | .bLength = USB_DT_MIDI_OUT_SIZE(1), | |
162 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
163 | .bDescriptorSubtype = USB_MS_MIDI_OUT_JACK, | |
164 | .bJackType = USB_MS_EMBEDDED, | |
165 | .bJackID = JACK_OUT_EMB, | |
166 | .bNrInputPins = 1, | |
167 | .pins = { | |
168 | [0] = { | |
169 | .baSourceID = JACK_IN_EXT, | |
170 | .baSourcePin = 1, | |
171 | } | |
172 | } | |
173 | }; | |
174 | ||
175 | static const struct usb_midi_out_jack_descriptor_1 jack_out_ext_desc = { | |
176 | .bLength = USB_DT_MIDI_OUT_SIZE(1), | |
177 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
178 | .bDescriptorSubtype = USB_MS_MIDI_OUT_JACK, | |
179 | .bJackType = USB_MS_EXTERNAL, | |
180 | .bJackID = JACK_OUT_EXT, | |
181 | .bNrInputPins = 1, | |
182 | .pins = { | |
183 | [0] = { | |
184 | .baSourceID = JACK_IN_EMB, | |
185 | .baSourcePin = 1, | |
186 | } | |
187 | } | |
188 | }; | |
189 | ||
190 | /* B.5.1 Standard Bulk OUT Endpoint Descriptor */ | |
191 | static struct usb_endpoint_descriptor bulk_out_desc = { | |
192 | .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, | |
193 | .bDescriptorType = USB_DT_ENDPOINT, | |
194 | .bEndpointAddress = USB_DIR_OUT, | |
195 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
196 | }; | |
197 | ||
198 | /* B.5.2 Class-specific MS Bulk OUT Endpoint Descriptor */ | |
199 | static const struct usb_ms_endpoint_descriptor_1 ms_out_desc = { | |
200 | .bLength = USB_DT_MS_ENDPOINT_SIZE(1), | |
201 | .bDescriptorType = USB_DT_CS_ENDPOINT, | |
202 | .bDescriptorSubtype = USB_MS_GENERAL, | |
203 | .bNumEmbMIDIJack = 1, | |
204 | .baAssocJackID = { | |
205 | [0] = JACK_IN_EMB, | |
206 | } | |
207 | }; | |
208 | ||
209 | /* B.6.1 Standard Bulk IN Endpoint Descriptor */ | |
210 | static struct usb_endpoint_descriptor bulk_in_desc = { | |
211 | .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, | |
212 | .bDescriptorType = USB_DT_ENDPOINT, | |
213 | .bEndpointAddress = USB_DIR_IN, | |
214 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
215 | }; | |
216 | ||
217 | /* B.6.2 Class-specific MS Bulk IN Endpoint Descriptor */ | |
218 | static const struct usb_ms_endpoint_descriptor_1 ms_in_desc = { | |
219 | .bLength = USB_DT_MS_ENDPOINT_SIZE(1), | |
220 | .bDescriptorType = USB_DT_CS_ENDPOINT, | |
221 | .bDescriptorSubtype = USB_MS_GENERAL, | |
222 | .bNumEmbMIDIJack = 1, | |
223 | .baAssocJackID = { | |
224 | [0] = JACK_OUT_EMB, | |
225 | } | |
226 | }; | |
227 | ||
228 | static struct usb_descriptor_header *midi_function[] = { | |
229 | (struct usb_descriptor_header *)&ac_interface_desc, | |
230 | (struct usb_descriptor_header *)&ac_header_desc, | |
231 | (struct usb_descriptor_header *)&ms_interface_desc, | |
232 | ||
233 | (struct usb_descriptor_header *)&ms_header_desc, | |
234 | (struct usb_descriptor_header *)&jack_in_emb_desc, | |
235 | (struct usb_descriptor_header *)&jack_in_ext_desc, | |
236 | (struct usb_descriptor_header *)&jack_out_emb_desc, | |
237 | (struct usb_descriptor_header *)&jack_out_ext_desc, | |
238 | /* If you add more jacks, update ms_header_desc.wTotalLength */ | |
239 | ||
240 | (struct usb_descriptor_header *)&bulk_out_desc, | |
241 | (struct usb_descriptor_header *)&ms_out_desc, | |
242 | (struct usb_descriptor_header *)&bulk_in_desc, | |
243 | (struct usb_descriptor_header *)&ms_in_desc, | |
244 | NULL, | |
245 | }; | |
246 | ||
247 | /* string IDs are assigned dynamically */ | |
248 | ||
249 | #define STRING_FUNC_IDX 0 | |
250 | ||
251 | static struct usb_string midi_string_defs[] = { | |
252 | [STRING_FUNC_IDX].s = "MIDI function", | |
253 | { } /* end of list */ | |
254 | }; | |
255 | ||
256 | static struct usb_gadget_strings midi_stringtab = { | |
257 | .language = 0x0409, /* en-us */ | |
258 | .strings = midi_string_defs, | |
259 | }; | |
260 | ||
261 | static struct usb_gadget_strings *midi_strings[] = { | |
262 | &midi_stringtab, | |
263 | NULL, | |
264 | }; | |
265 | ||
266 | static struct usb_request *alloc_ep_req(struct usb_ep *ep, unsigned length) | |
267 | { | |
268 | struct usb_request *req; | |
269 | ||
270 | req = usb_ep_alloc_request(ep, GFP_ATOMIC); | |
271 | if (req) { | |
272 | req->length = length; | |
273 | req->buf = kmalloc(length, GFP_ATOMIC); | |
274 | if (!req->buf) { | |
275 | usb_ep_free_request(ep, req); | |
276 | req = NULL; | |
277 | } | |
278 | } | |
279 | return req; | |
280 | } | |
281 | ||
282 | static void free_ep_req(struct usb_ep *ep, struct usb_request *req) | |
283 | { | |
284 | kfree(req->buf); | |
285 | usb_ep_free_request(ep, req); | |
286 | } | |
287 | ||
288 | static const uint8_t f_midi_cin_length[] = { | |
289 | 0, 0, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 2, 2, 3, 1 | |
290 | }; | |
291 | ||
292 | /* | |
293 | * Receives a chunk of MIDI data. | |
294 | */ | |
295 | static void f_midi_read_data(struct usb_ep *ep, int cable, | |
296 | uint8_t *data, int length) | |
297 | { | |
298 | struct f_midi *midi = ep->driver_data; | |
299 | /* cable is ignored, because for now we only have one. */ | |
300 | ||
301 | if (!midi->out_substream) | |
302 | /* Nobody is listening - throw it on the floor. */ | |
303 | return; | |
304 | ||
305 | if (!test_bit(midi->out_substream->number, &midi->out_triggered)) | |
306 | return; | |
307 | ||
308 | snd_rawmidi_receive(midi->out_substream, data, length); | |
309 | } | |
310 | ||
311 | static void f_midi_handle_out_data(struct usb_ep *ep, struct usb_request *req) | |
312 | { | |
313 | unsigned int i; | |
314 | u8 *buf = req->buf; | |
315 | ||
316 | for (i = 0; i + 3 < req->actual; i += 4) | |
317 | if (buf[i] != 0) { | |
318 | int cable = buf[i] >> 4; | |
319 | int length = f_midi_cin_length[buf[i] & 0x0f]; | |
320 | f_midi_read_data(ep, cable, &buf[i + 1], length); | |
321 | } | |
322 | } | |
323 | ||
324 | static void | |
325 | f_midi_complete(struct usb_ep *ep, struct usb_request *req) | |
326 | { | |
327 | struct f_midi *midi = ep->driver_data; | |
328 | struct usb_composite_dev *cdev = midi->func.config->cdev; | |
329 | int status = req->status; | |
330 | ||
331 | switch (status) { | |
332 | case 0: /* normal completion */ | |
333 | if (ep == midi->out_ep) { | |
334 | /* We received stuff. req is queued again, below */ | |
335 | f_midi_handle_out_data(ep, req); | |
336 | } else if (ep == midi->in_ep) { | |
337 | /* Our transmit completed. See if there's more to go. | |
338 | * f_midi_transmit eats req, don't queue it again. */ | |
339 | f_midi_transmit(midi, req); | |
340 | return; | |
341 | } | |
342 | break; | |
343 | ||
344 | /* this endpoint is normally active while we're configured */ | |
345 | case -ECONNABORTED: /* hardware forced ep reset */ | |
346 | case -ECONNRESET: /* request dequeued */ | |
347 | case -ESHUTDOWN: /* disconnect from host */ | |
348 | VDBG(cdev, "%s gone (%d), %d/%d\n", ep->name, status, | |
349 | req->actual, req->length); | |
350 | if (ep == midi->out_ep) | |
351 | f_midi_handle_out_data(ep, req); | |
352 | ||
353 | free_ep_req(ep, req); | |
354 | return; | |
355 | ||
356 | case -EOVERFLOW: /* buffer overrun on read means that | |
357 | * we didn't provide a big enough buffer. | |
358 | */ | |
359 | default: | |
360 | DBG(cdev, "%s complete --> %d, %d/%d\n", ep->name, | |
361 | status, req->actual, req->length); | |
362 | break; | |
363 | case -EREMOTEIO: /* short read */ | |
364 | break; | |
365 | } | |
366 | ||
367 | status = usb_ep_queue(ep, req, GFP_ATOMIC); | |
368 | if (status) { | |
369 | ERROR(cdev, "kill %s: resubmit %d bytes --> %d\n", | |
370 | ep->name, req->length, status); | |
371 | usb_ep_set_halt(ep); | |
372 | /* FIXME recover later ... somehow */ | |
373 | } | |
374 | } | |
375 | ||
376 | static int f_midi_start_ep(struct f_midi *midi, | |
377 | struct usb_function *f, | |
378 | struct usb_ep *ep) | |
379 | { | |
380 | int err; | |
381 | struct usb_composite_dev *cdev = f->config->cdev; | |
382 | ||
383 | if (ep->driver_data) | |
384 | usb_ep_disable(ep); | |
385 | ||
386 | err = config_ep_by_speed(midi->gadget, f, ep); | |
387 | if (err) { | |
388 | ERROR(cdev, "can't configure %s: %d\n", ep->name, err); | |
389 | return err; | |
390 | } | |
391 | ||
392 | err = usb_ep_enable(ep); | |
393 | if (err) { | |
394 | ERROR(cdev, "can't start %s: %d\n", ep->name, err); | |
395 | return err; | |
396 | } | |
397 | ||
398 | ep->driver_data = midi; | |
399 | ||
400 | return 0; | |
401 | } | |
402 | ||
403 | static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt) | |
404 | { | |
405 | struct f_midi *midi = func_to_midi(f); | |
406 | struct usb_composite_dev *cdev = f->config->cdev; | |
407 | unsigned i; | |
408 | int err; | |
409 | ||
410 | err = f_midi_start_ep(midi, f, midi->in_ep); | |
411 | if (err) | |
412 | return err; | |
413 | ||
414 | err = f_midi_start_ep(midi, f, midi->out_ep); | |
415 | if (err) | |
416 | return err; | |
417 | ||
418 | if (midi->out_ep->driver_data) | |
419 | usb_ep_disable(midi->out_ep); | |
420 | ||
421 | err = config_ep_by_speed(midi->gadget, f, midi->out_ep); | |
422 | if (err) { | |
423 | ERROR(cdev, "can't configure %s: %d\n", | |
424 | midi->out_ep->name, err); | |
425 | return err; | |
426 | } | |
427 | ||
428 | err = usb_ep_enable(midi->out_ep); | |
429 | if (err) { | |
430 | ERROR(cdev, "can't start %s: %d\n", | |
431 | midi->out_ep->name, err); | |
432 | return err; | |
433 | } | |
434 | ||
435 | midi->out_ep->driver_data = midi; | |
436 | ||
437 | /* allocate a bunch of read buffers and queue them all at once. */ | |
438 | for (i = 0; i < midi->qlen && err == 0; i++) { | |
439 | struct usb_request *req = | |
440 | alloc_ep_req(midi->out_ep, midi->buflen); | |
441 | if (req == NULL) | |
442 | return -ENOMEM; | |
443 | ||
444 | req->complete = f_midi_complete; | |
445 | err = usb_ep_queue(midi->out_ep, req, GFP_ATOMIC); | |
446 | if (err) { | |
447 | ERROR(midi, "%s queue req: %d\n", | |
448 | midi->out_ep->name, err); | |
449 | } | |
450 | } | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
455 | static void f_midi_disable(struct usb_function *f) | |
456 | { | |
457 | struct f_midi *midi = func_to_midi(f); | |
458 | struct usb_composite_dev *cdev = f->config->cdev; | |
459 | ||
460 | DBG(cdev, "disable\n"); | |
461 | ||
462 | /* | |
463 | * just disable endpoints, forcing completion of pending i/o. | |
464 | * all our completion handlers free their requests in this case. | |
465 | */ | |
466 | usb_ep_disable(midi->in_ep); | |
467 | usb_ep_disable(midi->out_ep); | |
468 | } | |
469 | ||
470 | static void f_midi_unbind(struct usb_configuration *c, struct usb_function *f) | |
471 | { | |
472 | struct usb_composite_dev *cdev = f->config->cdev; | |
473 | struct f_midi *midi = func_to_midi(f); | |
474 | struct snd_card *card; | |
475 | ||
476 | DBG(cdev, "unbind\n"); | |
477 | ||
478 | /* just to be sure */ | |
479 | f_midi_disable(f); | |
480 | ||
481 | card = midi->card; | |
482 | midi->card = NULL; | |
483 | if (card) | |
484 | snd_card_free(card); | |
485 | ||
486 | kfree(midi->id); | |
487 | midi->id = NULL; | |
488 | ||
489 | usb_free_descriptors(f->descriptors); | |
490 | kfree(midi); | |
491 | } | |
492 | ||
493 | static int f_midi_snd_free(struct snd_device *device) | |
494 | { | |
495 | return 0; | |
496 | } | |
497 | ||
498 | static void f_midi_transmit_packet(struct usb_request *req, uint8_t p0, | |
499 | uint8_t p1, uint8_t p2, uint8_t p3) | |
500 | { | |
501 | unsigned length = req->length; | |
502 | u8 *buf = (u8 *)req->buf + length; | |
503 | ||
504 | buf[0] = p0; | |
505 | buf[1] = p1; | |
506 | buf[2] = p2; | |
507 | buf[3] = p3; | |
508 | req->length = length + 4; | |
509 | } | |
510 | ||
511 | /* | |
512 | * Converts MIDI commands to USB MIDI packets. | |
513 | */ | |
514 | static void f_midi_transmit_byte(struct usb_request *req, | |
515 | struct gmidi_in_port *port, uint8_t b) | |
516 | { | |
517 | uint8_t p0 = port->cable; | |
518 | ||
519 | if (b >= 0xf8) { | |
520 | f_midi_transmit_packet(req, p0 | 0x0f, b, 0, 0); | |
521 | } else if (b >= 0xf0) { | |
522 | switch (b) { | |
523 | case 0xf0: | |
524 | port->data[0] = b; | |
525 | port->state = STATE_SYSEX_1; | |
526 | break; | |
527 | case 0xf1: | |
528 | case 0xf3: | |
529 | port->data[0] = b; | |
530 | port->state = STATE_1PARAM; | |
531 | break; | |
532 | case 0xf2: | |
533 | port->data[0] = b; | |
534 | port->state = STATE_2PARAM_1; | |
535 | break; | |
536 | case 0xf4: | |
537 | case 0xf5: | |
538 | port->state = STATE_UNKNOWN; | |
539 | break; | |
540 | case 0xf6: | |
541 | f_midi_transmit_packet(req, p0 | 0x05, 0xf6, 0, 0); | |
542 | port->state = STATE_UNKNOWN; | |
543 | break; | |
544 | case 0xf7: | |
545 | switch (port->state) { | |
546 | case STATE_SYSEX_0: | |
547 | f_midi_transmit_packet(req, | |
548 | p0 | 0x05, 0xf7, 0, 0); | |
549 | break; | |
550 | case STATE_SYSEX_1: | |
551 | f_midi_transmit_packet(req, | |
552 | p0 | 0x06, port->data[0], 0xf7, 0); | |
553 | break; | |
554 | case STATE_SYSEX_2: | |
555 | f_midi_transmit_packet(req, | |
556 | p0 | 0x07, port->data[0], | |
557 | port->data[1], 0xf7); | |
558 | break; | |
559 | } | |
560 | port->state = STATE_UNKNOWN; | |
561 | break; | |
562 | } | |
563 | } else if (b >= 0x80) { | |
564 | port->data[0] = b; | |
565 | if (b >= 0xc0 && b <= 0xdf) | |
566 | port->state = STATE_1PARAM; | |
567 | else | |
568 | port->state = STATE_2PARAM_1; | |
569 | } else { /* b < 0x80 */ | |
570 | switch (port->state) { | |
571 | case STATE_1PARAM: | |
572 | if (port->data[0] < 0xf0) { | |
573 | p0 |= port->data[0] >> 4; | |
574 | } else { | |
575 | p0 |= 0x02; | |
576 | port->state = STATE_UNKNOWN; | |
577 | } | |
578 | f_midi_transmit_packet(req, p0, port->data[0], b, 0); | |
579 | break; | |
580 | case STATE_2PARAM_1: | |
581 | port->data[1] = b; | |
582 | port->state = STATE_2PARAM_2; | |
583 | break; | |
584 | case STATE_2PARAM_2: | |
585 | if (port->data[0] < 0xf0) { | |
586 | p0 |= port->data[0] >> 4; | |
587 | port->state = STATE_2PARAM_1; | |
588 | } else { | |
589 | p0 |= 0x03; | |
590 | port->state = STATE_UNKNOWN; | |
591 | } | |
592 | f_midi_transmit_packet(req, | |
593 | p0, port->data[0], port->data[1], b); | |
594 | break; | |
595 | case STATE_SYSEX_0: | |
596 | port->data[0] = b; | |
597 | port->state = STATE_SYSEX_1; | |
598 | break; | |
599 | case STATE_SYSEX_1: | |
600 | port->data[1] = b; | |
601 | port->state = STATE_SYSEX_2; | |
602 | break; | |
603 | case STATE_SYSEX_2: | |
604 | f_midi_transmit_packet(req, | |
605 | p0 | 0x04, port->data[0], port->data[1], b); | |
606 | port->state = STATE_SYSEX_0; | |
607 | break; | |
608 | } | |
609 | } | |
610 | } | |
611 | ||
612 | static void f_midi_transmit(struct f_midi *midi, struct usb_request *req) | |
613 | { | |
614 | struct usb_ep *ep = midi->in_ep; | |
615 | struct gmidi_in_port *port = &midi->in_port; | |
616 | ||
617 | if (!ep) | |
618 | return; | |
619 | ||
620 | if (!req) | |
621 | req = alloc_ep_req(ep, midi->buflen); | |
622 | ||
623 | if (!req) { | |
624 | ERROR(midi, "gmidi_transmit: alloc_ep_request failed\n"); | |
625 | return; | |
626 | } | |
627 | req->length = 0; | |
628 | req->complete = f_midi_complete; | |
629 | ||
630 | if (port->active) { | |
631 | while (req->length + 3 < midi->buflen) { | |
632 | uint8_t b; | |
633 | if (snd_rawmidi_transmit(midi->in_substream, &b, 1) != 1) { | |
634 | port->active = 0; | |
635 | break; | |
636 | } | |
637 | f_midi_transmit_byte(req, port, b); | |
638 | } | |
639 | } | |
640 | ||
641 | if (req->length > 0) | |
642 | usb_ep_queue(ep, req, GFP_ATOMIC); | |
643 | else | |
644 | free_ep_req(ep, req); | |
645 | } | |
646 | ||
647 | static void f_midi_in_tasklet(unsigned long data) | |
648 | { | |
649 | struct f_midi *midi = (struct f_midi *) data; | |
650 | f_midi_transmit(midi, NULL); | |
651 | } | |
652 | ||
653 | static int f_midi_in_open(struct snd_rawmidi_substream *substream) | |
654 | { | |
655 | struct f_midi *midi = substream->rmidi->private_data; | |
656 | ||
657 | VDBG(midi, "%s()\n", __func__); | |
658 | midi->in_substream = substream; | |
659 | midi->in_port.state = STATE_UNKNOWN; | |
660 | return 0; | |
661 | } | |
662 | ||
663 | static int f_midi_in_close(struct snd_rawmidi_substream *substream) | |
664 | { | |
665 | struct f_midi *midi = substream->rmidi->private_data; | |
666 | ||
667 | VDBG(midi, "%s()\n", __func__); | |
668 | return 0; | |
669 | } | |
670 | ||
671 | static void f_midi_in_trigger(struct snd_rawmidi_substream *substream, int up) | |
672 | { | |
673 | struct f_midi *midi = substream->rmidi->private_data; | |
674 | ||
675 | VDBG(midi, "%s() %d\n", __func__, up); | |
676 | midi->in_port.active = up; | |
677 | if (up) | |
678 | tasklet_hi_schedule(&midi->tasklet); | |
679 | } | |
680 | ||
681 | static int f_midi_out_open(struct snd_rawmidi_substream *substream) | |
682 | { | |
683 | struct f_midi *midi = substream->rmidi->private_data; | |
684 | ||
685 | VDBG(midi, "%s()\n", __func__); | |
686 | midi->out_substream = substream; | |
687 | return 0; | |
688 | } | |
689 | ||
690 | static int f_midi_out_close(struct snd_rawmidi_substream *substream) | |
691 | { | |
692 | struct f_midi *midi = substream->rmidi->private_data; | |
693 | ||
694 | VDBG(midi, "%s()\n", __func__); | |
695 | return 0; | |
696 | } | |
697 | ||
698 | static void f_midi_out_trigger(struct snd_rawmidi_substream *substream, int up) | |
699 | { | |
700 | struct f_midi *midi = substream->rmidi->private_data; | |
701 | ||
702 | VDBG(midi, "%s()\n", __func__); | |
703 | ||
704 | if (up) | |
705 | set_bit(substream->number, &midi->out_triggered); | |
706 | else | |
707 | clear_bit(substream->number, &midi->out_triggered); | |
708 | } | |
709 | ||
710 | static struct snd_rawmidi_ops gmidi_in_ops = { | |
711 | .open = f_midi_in_open, | |
712 | .close = f_midi_in_close, | |
713 | .trigger = f_midi_in_trigger, | |
714 | }; | |
715 | ||
716 | static struct snd_rawmidi_ops gmidi_out_ops = { | |
717 | .open = f_midi_out_open, | |
718 | .close = f_midi_out_close, | |
719 | .trigger = f_midi_out_trigger | |
720 | }; | |
721 | ||
722 | /* register as a sound "card" */ | |
723 | static int f_midi_register_card(struct f_midi *midi) | |
724 | { | |
725 | struct snd_card *card; | |
726 | struct snd_rawmidi *rmidi; | |
727 | int err; | |
728 | int out_ports = 1; | |
729 | int in_ports = 1; | |
730 | static struct snd_device_ops ops = { | |
731 | .dev_free = f_midi_snd_free, | |
732 | }; | |
733 | ||
734 | err = snd_card_create(midi->index, midi->id, THIS_MODULE, 0, &card); | |
735 | if (err < 0) { | |
736 | ERROR(midi, "snd_card_create() failed\n"); | |
737 | goto fail; | |
738 | } | |
739 | midi->card = card; | |
740 | ||
741 | err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, midi, &ops); | |
742 | if (err < 0) { | |
743 | ERROR(midi, "snd_device_new() failed: error %d\n", err); | |
744 | goto fail; | |
745 | } | |
746 | ||
747 | strcpy(card->driver, f_midi_longname); | |
748 | strcpy(card->longname, f_midi_longname); | |
749 | strcpy(card->shortname, f_midi_shortname); | |
750 | ||
751 | /* Set up rawmidi */ | |
752 | midi->in_port.midi = midi; | |
753 | midi->in_port.active = 0; | |
754 | snd_component_add(card, "MIDI"); | |
755 | err = snd_rawmidi_new(card, card->longname, 0, | |
756 | out_ports, in_ports, &rmidi); | |
757 | if (err < 0) { | |
758 | ERROR(midi, "snd_rawmidi_new() failed: error %d\n", err); | |
759 | goto fail; | |
760 | } | |
761 | midi->rmidi = rmidi; | |
762 | strcpy(rmidi->name, card->shortname); | |
763 | rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT | | |
764 | SNDRV_RAWMIDI_INFO_INPUT | | |
765 | SNDRV_RAWMIDI_INFO_DUPLEX; | |
766 | rmidi->private_data = midi; | |
767 | ||
768 | /* | |
769 | * Yes, rawmidi OUTPUT = USB IN, and rawmidi INPUT = USB OUT. | |
770 | * It's an upside-down world being a gadget. | |
771 | */ | |
772 | snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &gmidi_in_ops); | |
773 | snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &gmidi_out_ops); | |
774 | ||
775 | snd_card_set_dev(card, &midi->gadget->dev); | |
776 | ||
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 | ||
787 | fail: | |
788 | if (midi->card) { | |
789 | snd_card_free(midi->card); | |
790 | midi->card = NULL; | |
791 | } | |
792 | return err; | |
793 | } | |
794 | ||
795 | /* MIDI function driver setup/binding */ | |
796 | ||
797 | static int __init | |
798 | f_midi_bind(struct usb_configuration *c, struct usb_function *f) | |
799 | { | |
800 | struct usb_composite_dev *cdev = c->cdev; | |
801 | struct f_midi *midi = func_to_midi(f); | |
802 | int status; | |
803 | ||
804 | /* maybe allocate device-global string ID */ | |
805 | if (midi_string_defs[0].id == 0) { | |
806 | status = usb_string_id(c->cdev); | |
807 | if (status < 0) | |
808 | goto fail; | |
809 | midi_string_defs[0].id = status; | |
810 | } | |
811 | ||
812 | /* We have two interfaces, AudioControl and MIDIStreaming */ | |
813 | status = usb_interface_id(c, f); | |
814 | if (status < 0) | |
815 | goto fail; | |
816 | ac_interface_desc.bInterfaceNumber = status; | |
817 | ||
818 | status = usb_interface_id(c, f); | |
819 | if (status < 0) | |
820 | goto fail; | |
821 | ms_interface_desc.bInterfaceNumber = status; | |
822 | ac_header_desc.baInterfaceNr[0] = status; | |
823 | ||
824 | status = -ENODEV; | |
825 | ||
826 | /* allocate instance-specific endpoints */ | |
827 | midi->in_ep = usb_ep_autoconfig(cdev->gadget, &bulk_in_desc); | |
828 | if (!midi->in_ep) | |
829 | goto fail; | |
830 | midi->in_ep->driver_data = cdev; /* claim */ | |
831 | ||
832 | midi->out_ep = usb_ep_autoconfig(cdev->gadget, &bulk_out_desc); | |
833 | if (!midi->out_ep) | |
834 | goto fail; | |
835 | midi->out_ep->driver_data = cdev; /* claim */ | |
836 | ||
837 | /* | |
838 | * support all relevant hardware speeds... we expect that when | |
839 | * hardware is dual speed, all bulk-capable endpoints work at | |
840 | * both speeds | |
841 | */ | |
842 | /* copy descriptors, and track endpoint copies */ | |
843 | if (gadget_is_dualspeed(c->cdev->gadget)) { | |
844 | c->highspeed = true; | |
845 | bulk_in_desc.wMaxPacketSize = cpu_to_le16(512); | |
846 | bulk_out_desc.wMaxPacketSize = cpu_to_le16(512); | |
847 | f->hs_descriptors = usb_copy_descriptors(midi_function); | |
848 | } else { | |
849 | f->descriptors = usb_copy_descriptors(midi_function); | |
850 | } | |
851 | ||
852 | return 0; | |
853 | ||
854 | fail: | |
855 | /* we might as well release our claims on endpoints */ | |
856 | if (midi->out_ep) | |
857 | midi->out_ep->driver_data = NULL; | |
858 | if (midi->in_ep) | |
859 | midi->in_ep->driver_data = NULL; | |
860 | ||
861 | ERROR(cdev, "%s: can't bind, err %d\n", f->name, status); | |
862 | ||
863 | return status; | |
864 | } | |
865 | ||
866 | /** | |
867 | * f_midi_bind_config - add USB MIDI function to a configuration | |
868 | * @c: the configuration to supcard the USB audio function | |
869 | * @index: the soundcard index to use for the ALSA device creation | |
870 | * @id: the soundcard id to use for the ALSA device creation | |
871 | * @buflen: the buffer length to use | |
872 | * @qlen the number of read requests to pre-allocate | |
873 | * Context: single threaded during gadget setup | |
874 | * | |
875 | * Returns zero on success, else negative errno. | |
876 | */ | |
877 | int __init f_midi_bind_config(struct usb_configuration *c, | |
878 | int index, char *id, | |
879 | unsigned int buflen, | |
880 | unsigned int qlen) | |
881 | { | |
882 | struct f_midi *midi; | |
883 | int status; | |
884 | ||
885 | /* allocate and initialize one new instance */ | |
886 | midi = kzalloc(sizeof *midi, GFP_KERNEL); | |
887 | if (!midi) { | |
888 | status = -ENOMEM; | |
889 | goto fail; | |
890 | } | |
891 | ||
892 | midi->gadget = c->cdev->gadget; | |
893 | tasklet_init(&midi->tasklet, f_midi_in_tasklet, (unsigned long) midi); | |
894 | ||
895 | /* set up ALSA midi devices */ | |
896 | status = f_midi_register_card(midi); | |
897 | if (status < 0) | |
898 | goto setup_fail; | |
899 | ||
900 | midi->func.name = "gmidi function"; | |
901 | midi->func.strings = midi_strings; | |
902 | midi->func.bind = f_midi_bind; | |
903 | midi->func.unbind = f_midi_unbind; | |
904 | midi->func.set_alt = f_midi_set_alt; | |
905 | midi->func.disable = f_midi_disable; | |
906 | ||
907 | midi->id = kstrdup(id, GFP_KERNEL); | |
908 | midi->index = index; | |
909 | midi->buflen = buflen; | |
910 | midi->qlen = qlen; | |
911 | ||
912 | status = usb_add_function(c, &midi->func); | |
913 | if (status) | |
914 | goto setup_fail; | |
915 | ||
916 | return 0; | |
917 | ||
918 | setup_fail: | |
919 | kfree(midi); | |
920 | fail: | |
921 | return status; | |
922 | } | |
923 |