Commit | Line | Data |
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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> | |
23 | #include <linux/slab.h> | |
d5daf49b DM |
24 | #include <linux/device.h> |
25 | ||
26 | #include <sound/core.h> | |
27 | #include <sound/initval.h> | |
28 | #include <sound/rawmidi.h> | |
29 | ||
30 | #include <linux/usb/ch9.h> | |
31 | #include <linux/usb/gadget.h> | |
32 | #include <linux/usb/audio.h> | |
33 | #include <linux/usb/midi.h> | |
34 | ||
35 | MODULE_AUTHOR("Ben Williamson"); | |
36 | MODULE_LICENSE("GPL v2"); | |
37 | ||
38 | static const char f_midi_shortname[] = "f_midi"; | |
39 | static const char f_midi_longname[] = "MIDI Gadget"; | |
40 | ||
c8933c3f DM |
41 | /* |
42 | * We can only handle 16 cables on one single endpoint, as cable numbers are | |
43 | * stored in 4-bit fields. And as the interface currently only holds one | |
44 | * single endpoint, this is the maximum number of ports we can allow. | |
45 | */ | |
46 | #define MAX_PORTS 16 | |
47 | ||
d5daf49b DM |
48 | /* |
49 | * This is a gadget, and the IN/OUT naming is from the host's perspective. | |
50 | * USB -> OUT endpoint -> rawmidi | |
51 | * USB <- IN endpoint <- rawmidi | |
52 | */ | |
53 | struct gmidi_in_port { | |
54 | struct f_midi *midi; | |
55 | int active; | |
c8933c3f | 56 | uint8_t cable; |
d5daf49b DM |
57 | uint8_t state; |
58 | #define STATE_UNKNOWN 0 | |
59 | #define STATE_1PARAM 1 | |
60 | #define STATE_2PARAM_1 2 | |
61 | #define STATE_2PARAM_2 3 | |
62 | #define STATE_SYSEX_0 4 | |
63 | #define STATE_SYSEX_1 5 | |
64 | #define STATE_SYSEX_2 6 | |
65 | uint8_t data[2]; | |
66 | }; | |
67 | ||
68 | struct f_midi { | |
69 | struct usb_function func; | |
70 | struct usb_gadget *gadget; | |
71 | struct usb_ep *in_ep, *out_ep; | |
72 | struct snd_card *card; | |
73 | struct snd_rawmidi *rmidi; | |
d5daf49b | 74 | |
c8933c3f DM |
75 | struct snd_rawmidi_substream *in_substream[MAX_PORTS]; |
76 | struct snd_rawmidi_substream *out_substream[MAX_PORTS]; | |
77 | struct gmidi_in_port *in_port[MAX_PORTS]; | |
78 | ||
d5daf49b DM |
79 | unsigned long out_triggered; |
80 | struct tasklet_struct tasklet; | |
c8933c3f DM |
81 | unsigned int in_ports; |
82 | unsigned int out_ports; | |
d5daf49b DM |
83 | int index; |
84 | char *id; | |
85 | unsigned int buflen, qlen; | |
86 | }; | |
87 | ||
88 | static inline struct f_midi *func_to_midi(struct usb_function *f) | |
89 | { | |
90 | return container_of(f, struct f_midi, func); | |
91 | } | |
92 | ||
93 | static void f_midi_transmit(struct f_midi *midi, struct usb_request *req); | |
94 | ||
95 | DECLARE_UAC_AC_HEADER_DESCRIPTOR(1); | |
96 | DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(1); | |
c8933c3f | 97 | DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(16); |
d5daf49b DM |
98 | |
99 | /* B.3.1 Standard AC Interface Descriptor */ | |
100 | static struct usb_interface_descriptor ac_interface_desc __initdata = { | |
101 | .bLength = USB_DT_INTERFACE_SIZE, | |
102 | .bDescriptorType = USB_DT_INTERFACE, | |
103 | /* .bInterfaceNumber = DYNAMIC */ | |
104 | /* .bNumEndpoints = DYNAMIC */ | |
105 | .bInterfaceClass = USB_CLASS_AUDIO, | |
106 | .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, | |
107 | /* .iInterface = DYNAMIC */ | |
108 | }; | |
109 | ||
110 | /* B.3.2 Class-Specific AC Interface Descriptor */ | |
111 | static struct uac1_ac_header_descriptor_1 ac_header_desc __initdata = { | |
112 | .bLength = UAC_DT_AC_HEADER_SIZE(1), | |
113 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
114 | .bDescriptorSubtype = USB_MS_HEADER, | |
115 | .bcdADC = cpu_to_le16(0x0100), | |
116 | .wTotalLength = cpu_to_le16(UAC_DT_AC_HEADER_SIZE(1)), | |
117 | .bInCollection = 1, | |
118 | /* .baInterfaceNr = DYNAMIC */ | |
119 | }; | |
120 | ||
121 | /* B.4.1 Standard MS Interface Descriptor */ | |
122 | static struct usb_interface_descriptor ms_interface_desc __initdata = { | |
123 | .bLength = USB_DT_INTERFACE_SIZE, | |
124 | .bDescriptorType = USB_DT_INTERFACE, | |
125 | /* .bInterfaceNumber = DYNAMIC */ | |
126 | .bNumEndpoints = 2, | |
127 | .bInterfaceClass = USB_CLASS_AUDIO, | |
128 | .bInterfaceSubClass = USB_SUBCLASS_MIDISTREAMING, | |
129 | /* .iInterface = DYNAMIC */ | |
130 | }; | |
131 | ||
132 | /* B.4.2 Class-Specific MS Interface Descriptor */ | |
133 | static struct usb_ms_header_descriptor ms_header_desc __initdata = { | |
134 | .bLength = USB_DT_MS_HEADER_SIZE, | |
135 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
136 | .bDescriptorSubtype = USB_MS_HEADER, | |
137 | .bcdMSC = cpu_to_le16(0x0100), | |
c8933c3f | 138 | /* .wTotalLength = DYNAMIC */ |
d5daf49b DM |
139 | }; |
140 | ||
d5daf49b DM |
141 | /* B.5.1 Standard Bulk OUT Endpoint Descriptor */ |
142 | static struct usb_endpoint_descriptor bulk_out_desc = { | |
143 | .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, | |
144 | .bDescriptorType = USB_DT_ENDPOINT, | |
145 | .bEndpointAddress = USB_DIR_OUT, | |
146 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
147 | }; | |
148 | ||
149 | /* B.5.2 Class-specific MS Bulk OUT Endpoint Descriptor */ | |
c8933c3f DM |
150 | static struct usb_ms_endpoint_descriptor_16 ms_out_desc = { |
151 | /* .bLength = DYNAMIC */ | |
d5daf49b DM |
152 | .bDescriptorType = USB_DT_CS_ENDPOINT, |
153 | .bDescriptorSubtype = USB_MS_GENERAL, | |
c8933c3f DM |
154 | /* .bNumEmbMIDIJack = DYNAMIC */ |
155 | /* .baAssocJackID = DYNAMIC */ | |
d5daf49b DM |
156 | }; |
157 | ||
158 | /* B.6.1 Standard Bulk IN Endpoint Descriptor */ | |
159 | static struct usb_endpoint_descriptor bulk_in_desc = { | |
160 | .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, | |
161 | .bDescriptorType = USB_DT_ENDPOINT, | |
162 | .bEndpointAddress = USB_DIR_IN, | |
163 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
164 | }; | |
165 | ||
166 | /* B.6.2 Class-specific MS Bulk IN Endpoint Descriptor */ | |
c8933c3f DM |
167 | static struct usb_ms_endpoint_descriptor_16 ms_in_desc = { |
168 | /* .bLength = DYNAMIC */ | |
d5daf49b DM |
169 | .bDescriptorType = USB_DT_CS_ENDPOINT, |
170 | .bDescriptorSubtype = USB_MS_GENERAL, | |
c8933c3f DM |
171 | /* .bNumEmbMIDIJack = DYNAMIC */ |
172 | /* .baAssocJackID = DYNAMIC */ | |
d5daf49b DM |
173 | }; |
174 | ||
175 | /* string IDs are assigned dynamically */ | |
176 | ||
177 | #define STRING_FUNC_IDX 0 | |
178 | ||
179 | static struct usb_string midi_string_defs[] = { | |
180 | [STRING_FUNC_IDX].s = "MIDI function", | |
181 | { } /* end of list */ | |
182 | }; | |
183 | ||
184 | static struct usb_gadget_strings midi_stringtab = { | |
185 | .language = 0x0409, /* en-us */ | |
186 | .strings = midi_string_defs, | |
187 | }; | |
188 | ||
189 | static struct usb_gadget_strings *midi_strings[] = { | |
190 | &midi_stringtab, | |
191 | NULL, | |
192 | }; | |
193 | ||
194 | static struct usb_request *alloc_ep_req(struct usb_ep *ep, unsigned length) | |
195 | { | |
196 | struct usb_request *req; | |
197 | ||
198 | req = usb_ep_alloc_request(ep, GFP_ATOMIC); | |
199 | if (req) { | |
200 | req->length = length; | |
201 | req->buf = kmalloc(length, GFP_ATOMIC); | |
202 | if (!req->buf) { | |
203 | usb_ep_free_request(ep, req); | |
204 | req = NULL; | |
205 | } | |
206 | } | |
207 | return req; | |
208 | } | |
209 | ||
210 | static void free_ep_req(struct usb_ep *ep, struct usb_request *req) | |
211 | { | |
212 | kfree(req->buf); | |
213 | usb_ep_free_request(ep, req); | |
214 | } | |
215 | ||
216 | static const uint8_t f_midi_cin_length[] = { | |
217 | 0, 0, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 2, 2, 3, 1 | |
218 | }; | |
219 | ||
220 | /* | |
221 | * Receives a chunk of MIDI data. | |
222 | */ | |
223 | static void f_midi_read_data(struct usb_ep *ep, int cable, | |
224 | uint8_t *data, int length) | |
225 | { | |
226 | struct f_midi *midi = ep->driver_data; | |
c8933c3f | 227 | struct snd_rawmidi_substream *substream = midi->out_substream[cable]; |
d5daf49b | 228 | |
c8933c3f | 229 | if (!substream) |
d5daf49b DM |
230 | /* Nobody is listening - throw it on the floor. */ |
231 | return; | |
232 | ||
c8933c3f | 233 | if (!test_bit(cable, &midi->out_triggered)) |
d5daf49b DM |
234 | return; |
235 | ||
c8933c3f | 236 | snd_rawmidi_receive(substream, data, length); |
d5daf49b DM |
237 | } |
238 | ||
239 | static void f_midi_handle_out_data(struct usb_ep *ep, struct usb_request *req) | |
240 | { | |
241 | unsigned int i; | |
242 | u8 *buf = req->buf; | |
243 | ||
244 | for (i = 0; i + 3 < req->actual; i += 4) | |
245 | if (buf[i] != 0) { | |
246 | int cable = buf[i] >> 4; | |
247 | int length = f_midi_cin_length[buf[i] & 0x0f]; | |
248 | f_midi_read_data(ep, cable, &buf[i + 1], length); | |
249 | } | |
250 | } | |
251 | ||
252 | static void | |
253 | f_midi_complete(struct usb_ep *ep, struct usb_request *req) | |
254 | { | |
255 | struct f_midi *midi = ep->driver_data; | |
256 | struct usb_composite_dev *cdev = midi->func.config->cdev; | |
257 | int status = req->status; | |
258 | ||
259 | switch (status) { | |
260 | case 0: /* normal completion */ | |
261 | if (ep == midi->out_ep) { | |
262 | /* We received stuff. req is queued again, below */ | |
263 | f_midi_handle_out_data(ep, req); | |
264 | } else if (ep == midi->in_ep) { | |
265 | /* Our transmit completed. See if there's more to go. | |
266 | * f_midi_transmit eats req, don't queue it again. */ | |
267 | f_midi_transmit(midi, req); | |
268 | return; | |
269 | } | |
270 | break; | |
271 | ||
272 | /* this endpoint is normally active while we're configured */ | |
273 | case -ECONNABORTED: /* hardware forced ep reset */ | |
274 | case -ECONNRESET: /* request dequeued */ | |
275 | case -ESHUTDOWN: /* disconnect from host */ | |
276 | VDBG(cdev, "%s gone (%d), %d/%d\n", ep->name, status, | |
277 | req->actual, req->length); | |
278 | if (ep == midi->out_ep) | |
279 | f_midi_handle_out_data(ep, req); | |
280 | ||
281 | free_ep_req(ep, req); | |
282 | return; | |
283 | ||
284 | case -EOVERFLOW: /* buffer overrun on read means that | |
285 | * we didn't provide a big enough buffer. | |
286 | */ | |
287 | default: | |
288 | DBG(cdev, "%s complete --> %d, %d/%d\n", ep->name, | |
289 | status, req->actual, req->length); | |
290 | break; | |
291 | case -EREMOTEIO: /* short read */ | |
292 | break; | |
293 | } | |
294 | ||
295 | status = usb_ep_queue(ep, req, GFP_ATOMIC); | |
296 | if (status) { | |
297 | ERROR(cdev, "kill %s: resubmit %d bytes --> %d\n", | |
298 | ep->name, req->length, status); | |
299 | usb_ep_set_halt(ep); | |
300 | /* FIXME recover later ... somehow */ | |
301 | } | |
302 | } | |
303 | ||
304 | static int f_midi_start_ep(struct f_midi *midi, | |
305 | struct usb_function *f, | |
306 | struct usb_ep *ep) | |
307 | { | |
308 | int err; | |
309 | struct usb_composite_dev *cdev = f->config->cdev; | |
310 | ||
311 | if (ep->driver_data) | |
312 | usb_ep_disable(ep); | |
313 | ||
314 | err = config_ep_by_speed(midi->gadget, f, ep); | |
315 | if (err) { | |
316 | ERROR(cdev, "can't configure %s: %d\n", ep->name, err); | |
317 | return err; | |
318 | } | |
319 | ||
320 | err = usb_ep_enable(ep); | |
321 | if (err) { | |
322 | ERROR(cdev, "can't start %s: %d\n", ep->name, err); | |
323 | return err; | |
324 | } | |
325 | ||
326 | ep->driver_data = midi; | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt) | |
332 | { | |
333 | struct f_midi *midi = func_to_midi(f); | |
334 | struct usb_composite_dev *cdev = f->config->cdev; | |
335 | unsigned i; | |
336 | int err; | |
337 | ||
338 | err = f_midi_start_ep(midi, f, midi->in_ep); | |
339 | if (err) | |
340 | return err; | |
341 | ||
342 | err = f_midi_start_ep(midi, f, midi->out_ep); | |
343 | if (err) | |
344 | return err; | |
345 | ||
346 | if (midi->out_ep->driver_data) | |
347 | usb_ep_disable(midi->out_ep); | |
348 | ||
349 | err = config_ep_by_speed(midi->gadget, f, midi->out_ep); | |
350 | if (err) { | |
351 | ERROR(cdev, "can't configure %s: %d\n", | |
352 | midi->out_ep->name, err); | |
353 | return err; | |
354 | } | |
355 | ||
356 | err = usb_ep_enable(midi->out_ep); | |
357 | if (err) { | |
358 | ERROR(cdev, "can't start %s: %d\n", | |
359 | midi->out_ep->name, err); | |
360 | return err; | |
361 | } | |
362 | ||
363 | midi->out_ep->driver_data = midi; | |
364 | ||
365 | /* allocate a bunch of read buffers and queue them all at once. */ | |
366 | for (i = 0; i < midi->qlen && err == 0; i++) { | |
367 | struct usb_request *req = | |
368 | alloc_ep_req(midi->out_ep, midi->buflen); | |
369 | if (req == NULL) | |
370 | return -ENOMEM; | |
371 | ||
372 | req->complete = f_midi_complete; | |
373 | err = usb_ep_queue(midi->out_ep, req, GFP_ATOMIC); | |
374 | if (err) { | |
375 | ERROR(midi, "%s queue req: %d\n", | |
376 | midi->out_ep->name, err); | |
377 | } | |
378 | } | |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
383 | static void f_midi_disable(struct usb_function *f) | |
384 | { | |
385 | struct f_midi *midi = func_to_midi(f); | |
386 | struct usb_composite_dev *cdev = f->config->cdev; | |
387 | ||
388 | DBG(cdev, "disable\n"); | |
389 | ||
390 | /* | |
391 | * just disable endpoints, forcing completion of pending i/o. | |
392 | * all our completion handlers free their requests in this case. | |
393 | */ | |
394 | usb_ep_disable(midi->in_ep); | |
395 | usb_ep_disable(midi->out_ep); | |
396 | } | |
397 | ||
398 | static void f_midi_unbind(struct usb_configuration *c, struct usb_function *f) | |
399 | { | |
400 | struct usb_composite_dev *cdev = f->config->cdev; | |
401 | struct f_midi *midi = func_to_midi(f); | |
402 | struct snd_card *card; | |
403 | ||
404 | DBG(cdev, "unbind\n"); | |
405 | ||
406 | /* just to be sure */ | |
407 | f_midi_disable(f); | |
408 | ||
409 | card = midi->card; | |
410 | midi->card = NULL; | |
411 | if (card) | |
412 | snd_card_free(card); | |
413 | ||
414 | kfree(midi->id); | |
415 | midi->id = NULL; | |
416 | ||
10287bae | 417 | usb_free_all_descriptors(f); |
d5daf49b DM |
418 | kfree(midi); |
419 | } | |
420 | ||
421 | static int f_midi_snd_free(struct snd_device *device) | |
422 | { | |
423 | return 0; | |
424 | } | |
425 | ||
426 | static void f_midi_transmit_packet(struct usb_request *req, uint8_t p0, | |
427 | uint8_t p1, uint8_t p2, uint8_t p3) | |
428 | { | |
429 | unsigned length = req->length; | |
430 | u8 *buf = (u8 *)req->buf + length; | |
431 | ||
432 | buf[0] = p0; | |
433 | buf[1] = p1; | |
434 | buf[2] = p2; | |
435 | buf[3] = p3; | |
436 | req->length = length + 4; | |
437 | } | |
438 | ||
439 | /* | |
440 | * Converts MIDI commands to USB MIDI packets. | |
441 | */ | |
442 | static void f_midi_transmit_byte(struct usb_request *req, | |
443 | struct gmidi_in_port *port, uint8_t b) | |
444 | { | |
c8933c3f | 445 | uint8_t p0 = port->cable << 4; |
d5daf49b DM |
446 | |
447 | if (b >= 0xf8) { | |
448 | f_midi_transmit_packet(req, p0 | 0x0f, b, 0, 0); | |
449 | } else if (b >= 0xf0) { | |
450 | switch (b) { | |
451 | case 0xf0: | |
452 | port->data[0] = b; | |
453 | port->state = STATE_SYSEX_1; | |
454 | break; | |
455 | case 0xf1: | |
456 | case 0xf3: | |
457 | port->data[0] = b; | |
458 | port->state = STATE_1PARAM; | |
459 | break; | |
460 | case 0xf2: | |
461 | port->data[0] = b; | |
462 | port->state = STATE_2PARAM_1; | |
463 | break; | |
464 | case 0xf4: | |
465 | case 0xf5: | |
466 | port->state = STATE_UNKNOWN; | |
467 | break; | |
468 | case 0xf6: | |
469 | f_midi_transmit_packet(req, p0 | 0x05, 0xf6, 0, 0); | |
470 | port->state = STATE_UNKNOWN; | |
471 | break; | |
472 | case 0xf7: | |
473 | switch (port->state) { | |
474 | case STATE_SYSEX_0: | |
475 | f_midi_transmit_packet(req, | |
476 | p0 | 0x05, 0xf7, 0, 0); | |
477 | break; | |
478 | case STATE_SYSEX_1: | |
479 | f_midi_transmit_packet(req, | |
480 | p0 | 0x06, port->data[0], 0xf7, 0); | |
481 | break; | |
482 | case STATE_SYSEX_2: | |
483 | f_midi_transmit_packet(req, | |
484 | p0 | 0x07, port->data[0], | |
485 | port->data[1], 0xf7); | |
486 | break; | |
487 | } | |
488 | port->state = STATE_UNKNOWN; | |
489 | break; | |
490 | } | |
491 | } else if (b >= 0x80) { | |
492 | port->data[0] = b; | |
493 | if (b >= 0xc0 && b <= 0xdf) | |
494 | port->state = STATE_1PARAM; | |
495 | else | |
496 | port->state = STATE_2PARAM_1; | |
497 | } else { /* b < 0x80 */ | |
498 | switch (port->state) { | |
499 | case STATE_1PARAM: | |
500 | if (port->data[0] < 0xf0) { | |
501 | p0 |= port->data[0] >> 4; | |
502 | } else { | |
503 | p0 |= 0x02; | |
504 | port->state = STATE_UNKNOWN; | |
505 | } | |
506 | f_midi_transmit_packet(req, p0, port->data[0], b, 0); | |
507 | break; | |
508 | case STATE_2PARAM_1: | |
509 | port->data[1] = b; | |
510 | port->state = STATE_2PARAM_2; | |
511 | break; | |
512 | case STATE_2PARAM_2: | |
513 | if (port->data[0] < 0xf0) { | |
514 | p0 |= port->data[0] >> 4; | |
515 | port->state = STATE_2PARAM_1; | |
516 | } else { | |
517 | p0 |= 0x03; | |
518 | port->state = STATE_UNKNOWN; | |
519 | } | |
520 | f_midi_transmit_packet(req, | |
521 | p0, port->data[0], port->data[1], b); | |
522 | break; | |
523 | case STATE_SYSEX_0: | |
524 | port->data[0] = b; | |
525 | port->state = STATE_SYSEX_1; | |
526 | break; | |
527 | case STATE_SYSEX_1: | |
528 | port->data[1] = b; | |
529 | port->state = STATE_SYSEX_2; | |
530 | break; | |
531 | case STATE_SYSEX_2: | |
532 | f_midi_transmit_packet(req, | |
533 | p0 | 0x04, port->data[0], port->data[1], b); | |
534 | port->state = STATE_SYSEX_0; | |
535 | break; | |
536 | } | |
537 | } | |
538 | } | |
539 | ||
540 | static void f_midi_transmit(struct f_midi *midi, struct usb_request *req) | |
541 | { | |
542 | struct usb_ep *ep = midi->in_ep; | |
c8933c3f | 543 | int i; |
d5daf49b DM |
544 | |
545 | if (!ep) | |
546 | return; | |
547 | ||
548 | if (!req) | |
549 | req = alloc_ep_req(ep, midi->buflen); | |
550 | ||
551 | if (!req) { | |
552 | ERROR(midi, "gmidi_transmit: alloc_ep_request failed\n"); | |
553 | return; | |
554 | } | |
555 | req->length = 0; | |
556 | req->complete = f_midi_complete; | |
557 | ||
c8933c3f DM |
558 | for (i = 0; i < MAX_PORTS; i++) { |
559 | struct gmidi_in_port *port = midi->in_port[i]; | |
560 | struct snd_rawmidi_substream *substream = midi->in_substream[i]; | |
561 | ||
562 | if (!port || !port->active || !substream) | |
563 | continue; | |
564 | ||
d5daf49b DM |
565 | while (req->length + 3 < midi->buflen) { |
566 | uint8_t b; | |
c8933c3f | 567 | if (snd_rawmidi_transmit(substream, &b, 1) != 1) { |
d5daf49b DM |
568 | port->active = 0; |
569 | break; | |
570 | } | |
571 | f_midi_transmit_byte(req, port, b); | |
572 | } | |
573 | } | |
574 | ||
575 | if (req->length > 0) | |
576 | usb_ep_queue(ep, req, GFP_ATOMIC); | |
577 | else | |
578 | free_ep_req(ep, req); | |
579 | } | |
580 | ||
581 | static void f_midi_in_tasklet(unsigned long data) | |
582 | { | |
583 | struct f_midi *midi = (struct f_midi *) data; | |
584 | f_midi_transmit(midi, NULL); | |
585 | } | |
586 | ||
587 | static int f_midi_in_open(struct snd_rawmidi_substream *substream) | |
588 | { | |
589 | struct f_midi *midi = substream->rmidi->private_data; | |
590 | ||
c8933c3f DM |
591 | if (!midi->in_port[substream->number]) |
592 | return -EINVAL; | |
593 | ||
d5daf49b | 594 | VDBG(midi, "%s()\n", __func__); |
c8933c3f DM |
595 | midi->in_substream[substream->number] = substream; |
596 | midi->in_port[substream->number]->state = STATE_UNKNOWN; | |
d5daf49b DM |
597 | return 0; |
598 | } | |
599 | ||
600 | static int f_midi_in_close(struct snd_rawmidi_substream *substream) | |
601 | { | |
602 | struct f_midi *midi = substream->rmidi->private_data; | |
603 | ||
604 | VDBG(midi, "%s()\n", __func__); | |
605 | return 0; | |
606 | } | |
607 | ||
608 | static void f_midi_in_trigger(struct snd_rawmidi_substream *substream, int up) | |
609 | { | |
610 | struct f_midi *midi = substream->rmidi->private_data; | |
611 | ||
c8933c3f DM |
612 | if (!midi->in_port[substream->number]) |
613 | return; | |
614 | ||
d5daf49b | 615 | VDBG(midi, "%s() %d\n", __func__, up); |
c8933c3f | 616 | midi->in_port[substream->number]->active = up; |
d5daf49b DM |
617 | if (up) |
618 | tasklet_hi_schedule(&midi->tasklet); | |
619 | } | |
620 | ||
621 | static int f_midi_out_open(struct snd_rawmidi_substream *substream) | |
622 | { | |
623 | struct f_midi *midi = substream->rmidi->private_data; | |
624 | ||
08895512 | 625 | if (substream->number >= MAX_PORTS) |
c8933c3f DM |
626 | return -EINVAL; |
627 | ||
d5daf49b | 628 | VDBG(midi, "%s()\n", __func__); |
c8933c3f | 629 | midi->out_substream[substream->number] = substream; |
d5daf49b DM |
630 | return 0; |
631 | } | |
632 | ||
633 | static int f_midi_out_close(struct snd_rawmidi_substream *substream) | |
634 | { | |
635 | struct f_midi *midi = substream->rmidi->private_data; | |
636 | ||
637 | VDBG(midi, "%s()\n", __func__); | |
638 | return 0; | |
639 | } | |
640 | ||
641 | static void f_midi_out_trigger(struct snd_rawmidi_substream *substream, int up) | |
642 | { | |
643 | struct f_midi *midi = substream->rmidi->private_data; | |
644 | ||
645 | VDBG(midi, "%s()\n", __func__); | |
646 | ||
647 | if (up) | |
648 | set_bit(substream->number, &midi->out_triggered); | |
649 | else | |
650 | clear_bit(substream->number, &midi->out_triggered); | |
651 | } | |
652 | ||
653 | static struct snd_rawmidi_ops gmidi_in_ops = { | |
654 | .open = f_midi_in_open, | |
655 | .close = f_midi_in_close, | |
656 | .trigger = f_midi_in_trigger, | |
657 | }; | |
658 | ||
659 | static struct snd_rawmidi_ops gmidi_out_ops = { | |
660 | .open = f_midi_out_open, | |
661 | .close = f_midi_out_close, | |
662 | .trigger = f_midi_out_trigger | |
663 | }; | |
664 | ||
665 | /* register as a sound "card" */ | |
666 | static int f_midi_register_card(struct f_midi *midi) | |
667 | { | |
668 | struct snd_card *card; | |
669 | struct snd_rawmidi *rmidi; | |
670 | int err; | |
d5daf49b DM |
671 | static struct snd_device_ops ops = { |
672 | .dev_free = f_midi_snd_free, | |
673 | }; | |
674 | ||
675 | err = snd_card_create(midi->index, midi->id, THIS_MODULE, 0, &card); | |
676 | if (err < 0) { | |
677 | ERROR(midi, "snd_card_create() failed\n"); | |
678 | goto fail; | |
679 | } | |
680 | midi->card = card; | |
681 | ||
682 | err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, midi, &ops); | |
683 | if (err < 0) { | |
684 | ERROR(midi, "snd_device_new() failed: error %d\n", err); | |
685 | goto fail; | |
686 | } | |
687 | ||
688 | strcpy(card->driver, f_midi_longname); | |
689 | strcpy(card->longname, f_midi_longname); | |
690 | strcpy(card->shortname, f_midi_shortname); | |
691 | ||
692 | /* Set up rawmidi */ | |
d5daf49b DM |
693 | snd_component_add(card, "MIDI"); |
694 | err = snd_rawmidi_new(card, card->longname, 0, | |
c8933c3f | 695 | midi->out_ports, midi->in_ports, &rmidi); |
d5daf49b DM |
696 | if (err < 0) { |
697 | ERROR(midi, "snd_rawmidi_new() failed: error %d\n", err); | |
698 | goto fail; | |
699 | } | |
700 | midi->rmidi = rmidi; | |
701 | strcpy(rmidi->name, card->shortname); | |
702 | rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT | | |
703 | SNDRV_RAWMIDI_INFO_INPUT | | |
704 | SNDRV_RAWMIDI_INFO_DUPLEX; | |
705 | rmidi->private_data = midi; | |
706 | ||
707 | /* | |
708 | * Yes, rawmidi OUTPUT = USB IN, and rawmidi INPUT = USB OUT. | |
709 | * It's an upside-down world being a gadget. | |
710 | */ | |
711 | snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &gmidi_in_ops); | |
712 | snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &gmidi_out_ops); | |
713 | ||
714 | snd_card_set_dev(card, &midi->gadget->dev); | |
715 | ||
716 | /* register it - we're ready to go */ | |
717 | err = snd_card_register(card); | |
718 | if (err < 0) { | |
719 | ERROR(midi, "snd_card_register() failed\n"); | |
720 | goto fail; | |
721 | } | |
722 | ||
723 | VDBG(midi, "%s() finished ok\n", __func__); | |
724 | return 0; | |
725 | ||
726 | fail: | |
727 | if (midi->card) { | |
728 | snd_card_free(midi->card); | |
729 | midi->card = NULL; | |
730 | } | |
731 | return err; | |
732 | } | |
733 | ||
734 | /* MIDI function driver setup/binding */ | |
735 | ||
736 | static int __init | |
737 | f_midi_bind(struct usb_configuration *c, struct usb_function *f) | |
738 | { | |
74203de0 | 739 | struct usb_descriptor_header **midi_function; |
c8933c3f | 740 | struct usb_midi_in_jack_descriptor jack_in_ext_desc[MAX_PORTS]; |
74203de0 | 741 | struct usb_midi_in_jack_descriptor jack_in_emb_desc[MAX_PORTS]; |
c8933c3f | 742 | struct usb_midi_out_jack_descriptor_1 jack_out_ext_desc[MAX_PORTS]; |
74203de0 | 743 | struct usb_midi_out_jack_descriptor_1 jack_out_emb_desc[MAX_PORTS]; |
d5daf49b DM |
744 | struct usb_composite_dev *cdev = c->cdev; |
745 | struct f_midi *midi = func_to_midi(f); | |
c8933c3f | 746 | int status, n, jack = 1, i = 0; |
d5daf49b DM |
747 | |
748 | /* maybe allocate device-global string ID */ | |
749 | if (midi_string_defs[0].id == 0) { | |
750 | status = usb_string_id(c->cdev); | |
751 | if (status < 0) | |
752 | goto fail; | |
753 | midi_string_defs[0].id = status; | |
754 | } | |
755 | ||
756 | /* We have two interfaces, AudioControl and MIDIStreaming */ | |
757 | status = usb_interface_id(c, f); | |
758 | if (status < 0) | |
759 | goto fail; | |
760 | ac_interface_desc.bInterfaceNumber = status; | |
761 | ||
762 | status = usb_interface_id(c, f); | |
763 | if (status < 0) | |
764 | goto fail; | |
765 | ms_interface_desc.bInterfaceNumber = status; | |
766 | ac_header_desc.baInterfaceNr[0] = status; | |
767 | ||
768 | status = -ENODEV; | |
769 | ||
770 | /* allocate instance-specific endpoints */ | |
771 | midi->in_ep = usb_ep_autoconfig(cdev->gadget, &bulk_in_desc); | |
772 | if (!midi->in_ep) | |
773 | goto fail; | |
774 | midi->in_ep->driver_data = cdev; /* claim */ | |
775 | ||
776 | midi->out_ep = usb_ep_autoconfig(cdev->gadget, &bulk_out_desc); | |
777 | if (!midi->out_ep) | |
778 | goto fail; | |
779 | midi->out_ep->driver_data = cdev; /* claim */ | |
780 | ||
74203de0 | 781 | /* allocate temporary function list */ |
2a5be878 | 782 | midi_function = kcalloc((MAX_PORTS * 4) + 9, sizeof(*midi_function), |
74203de0 DM |
783 | GFP_KERNEL); |
784 | if (!midi_function) { | |
785 | status = -ENOMEM; | |
786 | goto fail; | |
787 | } | |
788 | ||
c8933c3f DM |
789 | /* |
790 | * construct the function's descriptor set. As the number of | |
791 | * input and output MIDI ports is configurable, we have to do | |
792 | * it that way. | |
793 | */ | |
794 | ||
795 | /* add the headers - these are always the same */ | |
796 | midi_function[i++] = (struct usb_descriptor_header *) &ac_interface_desc; | |
797 | midi_function[i++] = (struct usb_descriptor_header *) &ac_header_desc; | |
798 | midi_function[i++] = (struct usb_descriptor_header *) &ms_interface_desc; | |
799 | ||
800 | /* calculate the header's wTotalLength */ | |
801 | n = USB_DT_MS_HEADER_SIZE | |
74203de0 DM |
802 | + (midi->in_ports + midi->out_ports) * |
803 | (USB_DT_MIDI_IN_SIZE + USB_DT_MIDI_OUT_SIZE(1)); | |
c8933c3f DM |
804 | ms_header_desc.wTotalLength = cpu_to_le16(n); |
805 | ||
806 | midi_function[i++] = (struct usb_descriptor_header *) &ms_header_desc; | |
807 | ||
74203de0 | 808 | /* configure the external IN jacks, each linked to an embedded OUT jack */ |
c8933c3f | 809 | for (n = 0; n < midi->in_ports; n++) { |
74203de0 DM |
810 | struct usb_midi_in_jack_descriptor *in_ext = &jack_in_ext_desc[n]; |
811 | struct usb_midi_out_jack_descriptor_1 *out_emb = &jack_out_emb_desc[n]; | |
812 | ||
813 | in_ext->bLength = USB_DT_MIDI_IN_SIZE; | |
814 | in_ext->bDescriptorType = USB_DT_CS_INTERFACE; | |
815 | in_ext->bDescriptorSubtype = USB_MS_MIDI_IN_JACK; | |
816 | in_ext->bJackType = USB_MS_EXTERNAL; | |
817 | in_ext->bJackID = jack++; | |
818 | in_ext->iJack = 0; | |
819 | midi_function[i++] = (struct usb_descriptor_header *) in_ext; | |
820 | ||
821 | out_emb->bLength = USB_DT_MIDI_OUT_SIZE(1); | |
822 | out_emb->bDescriptorType = USB_DT_CS_INTERFACE; | |
823 | out_emb->bDescriptorSubtype = USB_MS_MIDI_OUT_JACK; | |
824 | out_emb->bJackType = USB_MS_EMBEDDED; | |
825 | out_emb->bJackID = jack++; | |
826 | out_emb->bNrInputPins = 1; | |
827 | out_emb->pins[0].baSourcePin = 1; | |
828 | out_emb->pins[0].baSourceID = in_ext->bJackID; | |
829 | out_emb->iJack = 0; | |
830 | midi_function[i++] = (struct usb_descriptor_header *) out_emb; | |
831 | ||
832 | /* link it to the endpoint */ | |
833 | ms_in_desc.baAssocJackID[n] = out_emb->bJackID; | |
c8933c3f DM |
834 | } |
835 | ||
74203de0 | 836 | /* configure the external OUT jacks, each linked to an embedded IN jack */ |
c8933c3f | 837 | for (n = 0; n < midi->out_ports; n++) { |
74203de0 DM |
838 | struct usb_midi_in_jack_descriptor *in_emb = &jack_in_emb_desc[n]; |
839 | struct usb_midi_out_jack_descriptor_1 *out_ext = &jack_out_ext_desc[n]; | |
840 | ||
841 | in_emb->bLength = USB_DT_MIDI_IN_SIZE; | |
842 | in_emb->bDescriptorType = USB_DT_CS_INTERFACE; | |
843 | in_emb->bDescriptorSubtype = USB_MS_MIDI_IN_JACK; | |
844 | in_emb->bJackType = USB_MS_EMBEDDED; | |
845 | in_emb->bJackID = jack++; | |
846 | in_emb->iJack = 0; | |
847 | midi_function[i++] = (struct usb_descriptor_header *) in_emb; | |
848 | ||
849 | out_ext->bLength = USB_DT_MIDI_OUT_SIZE(1); | |
850 | out_ext->bDescriptorType = USB_DT_CS_INTERFACE; | |
851 | out_ext->bDescriptorSubtype = USB_MS_MIDI_OUT_JACK; | |
852 | out_ext->bJackType = USB_MS_EXTERNAL; | |
853 | out_ext->bJackID = jack++; | |
854 | out_ext->bNrInputPins = 1; | |
855 | out_ext->iJack = 0; | |
856 | out_ext->pins[0].baSourceID = in_emb->bJackID; | |
857 | out_ext->pins[0].baSourcePin = 1; | |
858 | midi_function[i++] = (struct usb_descriptor_header *) out_ext; | |
859 | ||
860 | /* link it to the endpoint */ | |
861 | ms_out_desc.baAssocJackID[n] = in_emb->bJackID; | |
c8933c3f DM |
862 | } |
863 | ||
864 | /* configure the endpoint descriptors ... */ | |
865 | ms_out_desc.bLength = USB_DT_MS_ENDPOINT_SIZE(midi->in_ports); | |
866 | ms_out_desc.bNumEmbMIDIJack = midi->in_ports; | |
c8933c3f DM |
867 | |
868 | ms_in_desc.bLength = USB_DT_MS_ENDPOINT_SIZE(midi->out_ports); | |
869 | ms_in_desc.bNumEmbMIDIJack = midi->out_ports; | |
c8933c3f DM |
870 | |
871 | /* ... and add them to the list */ | |
872 | midi_function[i++] = (struct usb_descriptor_header *) &bulk_out_desc; | |
873 | midi_function[i++] = (struct usb_descriptor_header *) &ms_out_desc; | |
874 | midi_function[i++] = (struct usb_descriptor_header *) &bulk_in_desc; | |
875 | midi_function[i++] = (struct usb_descriptor_header *) &ms_in_desc; | |
876 | midi_function[i++] = NULL; | |
877 | ||
d5daf49b DM |
878 | /* |
879 | * support all relevant hardware speeds... we expect that when | |
880 | * hardware is dual speed, all bulk-capable endpoints work at | |
881 | * both speeds | |
882 | */ | |
883 | /* copy descriptors, and track endpoint copies */ | |
10287bae SAS |
884 | f->fs_descriptors = usb_copy_descriptors(midi_function); |
885 | if (!f->fs_descriptors) | |
7f2a9268 | 886 | goto fail_f_midi; |
10287bae | 887 | |
d5daf49b | 888 | if (gadget_is_dualspeed(c->cdev->gadget)) { |
d5daf49b DM |
889 | bulk_in_desc.wMaxPacketSize = cpu_to_le16(512); |
890 | bulk_out_desc.wMaxPacketSize = cpu_to_le16(512); | |
891 | f->hs_descriptors = usb_copy_descriptors(midi_function); | |
7f2a9268 SAS |
892 | if (!f->hs_descriptors) |
893 | goto fail_f_midi; | |
d5daf49b DM |
894 | } |
895 | ||
74203de0 DM |
896 | kfree(midi_function); |
897 | ||
d5daf49b DM |
898 | return 0; |
899 | ||
7f2a9268 SAS |
900 | fail_f_midi: |
901 | kfree(midi_function); | |
902 | usb_free_descriptors(f->hs_descriptors); | |
d5daf49b DM |
903 | fail: |
904 | /* we might as well release our claims on endpoints */ | |
905 | if (midi->out_ep) | |
906 | midi->out_ep->driver_data = NULL; | |
907 | if (midi->in_ep) | |
908 | midi->in_ep->driver_data = NULL; | |
909 | ||
910 | ERROR(cdev, "%s: can't bind, err %d\n", f->name, status); | |
911 | ||
912 | return status; | |
913 | } | |
914 | ||
915 | /** | |
916 | * f_midi_bind_config - add USB MIDI function to a configuration | |
917 | * @c: the configuration to supcard the USB audio function | |
918 | * @index: the soundcard index to use for the ALSA device creation | |
919 | * @id: the soundcard id to use for the ALSA device creation | |
920 | * @buflen: the buffer length to use | |
921 | * @qlen the number of read requests to pre-allocate | |
922 | * Context: single threaded during gadget setup | |
923 | * | |
924 | * Returns zero on success, else negative errno. | |
925 | */ | |
926 | int __init f_midi_bind_config(struct usb_configuration *c, | |
927 | int index, char *id, | |
c8933c3f DM |
928 | unsigned int in_ports, |
929 | unsigned int out_ports, | |
d5daf49b DM |
930 | unsigned int buflen, |
931 | unsigned int qlen) | |
932 | { | |
933 | struct f_midi *midi; | |
c8933c3f DM |
934 | int status, i; |
935 | ||
936 | /* sanity check */ | |
937 | if (in_ports > MAX_PORTS || out_ports > MAX_PORTS) | |
938 | return -EINVAL; | |
d5daf49b DM |
939 | |
940 | /* allocate and initialize one new instance */ | |
941 | midi = kzalloc(sizeof *midi, GFP_KERNEL); | |
942 | if (!midi) { | |
943 | status = -ENOMEM; | |
944 | goto fail; | |
945 | } | |
946 | ||
c8933c3f DM |
947 | for (i = 0; i < in_ports; i++) { |
948 | struct gmidi_in_port *port = kzalloc(sizeof(*port), GFP_KERNEL); | |
949 | if (!port) { | |
950 | status = -ENOMEM; | |
0f8fd43c | 951 | goto setup_fail; |
c8933c3f DM |
952 | } |
953 | ||
954 | port->midi = midi; | |
955 | port->active = 0; | |
956 | port->cable = i; | |
957 | midi->in_port[i] = port; | |
958 | } | |
959 | ||
d5daf49b DM |
960 | midi->gadget = c->cdev->gadget; |
961 | tasklet_init(&midi->tasklet, f_midi_in_tasklet, (unsigned long) midi); | |
962 | ||
963 | /* set up ALSA midi devices */ | |
c8933c3f DM |
964 | midi->in_ports = in_ports; |
965 | midi->out_ports = out_ports; | |
d5daf49b DM |
966 | status = f_midi_register_card(midi); |
967 | if (status < 0) | |
968 | goto setup_fail; | |
969 | ||
970 | midi->func.name = "gmidi function"; | |
971 | midi->func.strings = midi_strings; | |
972 | midi->func.bind = f_midi_bind; | |
973 | midi->func.unbind = f_midi_unbind; | |
974 | midi->func.set_alt = f_midi_set_alt; | |
975 | midi->func.disable = f_midi_disable; | |
976 | ||
977 | midi->id = kstrdup(id, GFP_KERNEL); | |
978 | midi->index = index; | |
979 | midi->buflen = buflen; | |
980 | midi->qlen = qlen; | |
981 | ||
982 | status = usb_add_function(c, &midi->func); | |
983 | if (status) | |
984 | goto setup_fail; | |
985 | ||
986 | return 0; | |
987 | ||
988 | setup_fail: | |
0f8fd43c DC |
989 | for (--i; i >= 0; i--) |
990 | kfree(midi->in_port[i]); | |
d5daf49b DM |
991 | kfree(midi); |
992 | fail: | |
993 | return status; | |
994 | } | |
995 |