1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* |
3 | * f_audio.c -- USB Audio class function driver |
4 | * |
5 | * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org> |
6 | * Copyright (C) 2008 Analog Devices, Inc |
7 | */ |
8 | |
9 | #include <linux/slab.h> |
10 | #include <linux/kernel.h> |
11 | #include <linux/module.h> |
12 | #include <linux/device.h> |
13 | #include <linux/atomic.h> |
14 | |
15 | #include "u_uac1_legacy.h" |
16 | |
17 | static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value); |
18 | static int generic_get_cmd(struct usb_audio_control *con, u8 cmd); |
19 | |
20 | /* |
21 | * DESCRIPTORS ... most are static, but strings and full |
22 | * configuration descriptors are built on demand. |
23 | */ |
24 | |
25 | /* |
26 | * We have two interfaces- AudioControl and AudioStreaming |
27 | * TODO: only supcard playback currently |
28 | */ |
29 | #define F_AUDIO_AC_INTERFACE 0 |
30 | #define F_AUDIO_AS_INTERFACE 1 |
31 | #define F_AUDIO_NUM_INTERFACES 1 |
32 | |
33 | /* B.3.1 Standard AC Interface Descriptor */ |
34 | static struct usb_interface_descriptor ac_interface_desc = { |
35 | .bLength = USB_DT_INTERFACE_SIZE, |
36 | .bDescriptorType = USB_DT_INTERFACE, |
37 | .bNumEndpoints = 0, |
38 | .bInterfaceClass = USB_CLASS_AUDIO, |
39 | .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, |
40 | }; |
41 | |
42 | /* |
43 | * The number of AudioStreaming and MIDIStreaming interfaces |
44 | * in the Audio Interface Collection |
45 | */ |
46 | DECLARE_UAC_AC_HEADER_DESCRIPTOR(1); |
47 | |
48 | #define UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES) |
49 | /* 1 input terminal, 1 output terminal and 1 feature unit */ |
50 | #define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH + UAC_DT_INPUT_TERMINAL_SIZE \ |
51 | + UAC_DT_OUTPUT_TERMINAL_SIZE + UAC_DT_FEATURE_UNIT_SIZE(0)) |
52 | /* B.3.2 Class-Specific AC Interface Descriptor */ |
53 | static struct uac1_ac_header_descriptor_1 = { |
54 | .bLength = UAC_DT_AC_HEADER_LENGTH, |
55 | .bDescriptorType = USB_DT_CS_INTERFACE, |
56 | .bDescriptorSubtype = UAC_HEADER, |
57 | .bcdADC = cpu_to_le16(0x0100), |
58 | .wTotalLength = cpu_to_le16(UAC_DT_TOTAL_LENGTH), |
59 | .bInCollection = F_AUDIO_NUM_INTERFACES, |
60 | .baInterfaceNr = { |
61 | /* Interface number of the first AudioStream interface */ |
62 | [0] = 1, |
63 | } |
64 | }; |
65 | |
66 | #define INPUT_TERMINAL_ID 1 |
67 | static struct uac_input_terminal_descriptor input_terminal_desc = { |
68 | .bLength = UAC_DT_INPUT_TERMINAL_SIZE, |
69 | .bDescriptorType = USB_DT_CS_INTERFACE, |
70 | .bDescriptorSubtype = UAC_INPUT_TERMINAL, |
71 | .bTerminalID = INPUT_TERMINAL_ID, |
72 | .wTerminalType = UAC_TERMINAL_STREAMING, |
73 | .bAssocTerminal = 0, |
74 | .wChannelConfig = 0x3, |
75 | }; |
76 | |
77 | DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0); |
78 | |
79 | #define FEATURE_UNIT_ID 2 |
80 | static struct uac_feature_unit_descriptor_0 feature_unit_desc = { |
81 | .bLength = UAC_DT_FEATURE_UNIT_SIZE(0), |
82 | .bDescriptorType = USB_DT_CS_INTERFACE, |
83 | .bDescriptorSubtype = UAC_FEATURE_UNIT, |
84 | .bUnitID = FEATURE_UNIT_ID, |
85 | .bSourceID = INPUT_TERMINAL_ID, |
86 | .bControlSize = 2, |
87 | .bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME), |
88 | }; |
89 | |
90 | static struct usb_audio_control mute_control = { |
91 | .list = LIST_HEAD_INIT(mute_control.list), |
92 | .name = "Mute Control" , |
93 | .type = UAC_FU_MUTE, |
94 | /* Todo: add real Mute control code */ |
95 | .set = generic_set_cmd, |
96 | .get = generic_get_cmd, |
97 | }; |
98 | |
99 | static struct usb_audio_control volume_control = { |
100 | .list = LIST_HEAD_INIT(volume_control.list), |
101 | .name = "Volume Control" , |
102 | .type = UAC_FU_VOLUME, |
103 | /* Todo: add real Volume control code */ |
104 | .set = generic_set_cmd, |
105 | .get = generic_get_cmd, |
106 | }; |
107 | |
108 | static struct usb_audio_control_selector feature_unit = { |
109 | .list = LIST_HEAD_INIT(feature_unit.list), |
110 | .id = FEATURE_UNIT_ID, |
111 | .name = "Mute & Volume Control" , |
112 | .type = UAC_FEATURE_UNIT, |
113 | .desc = (struct usb_descriptor_header *)&feature_unit_desc, |
114 | }; |
115 | |
116 | #define OUTPUT_TERMINAL_ID 3 |
117 | static struct uac1_output_terminal_descriptor output_terminal_desc = { |
118 | .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE, |
119 | .bDescriptorType = USB_DT_CS_INTERFACE, |
120 | .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, |
121 | .bTerminalID = OUTPUT_TERMINAL_ID, |
122 | .wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER, |
123 | .bAssocTerminal = FEATURE_UNIT_ID, |
124 | .bSourceID = FEATURE_UNIT_ID, |
125 | }; |
126 | |
127 | /* B.4.1 Standard AS Interface Descriptor */ |
128 | static struct usb_interface_descriptor as_interface_alt_0_desc = { |
129 | .bLength = USB_DT_INTERFACE_SIZE, |
130 | .bDescriptorType = USB_DT_INTERFACE, |
131 | .bAlternateSetting = 0, |
132 | .bNumEndpoints = 0, |
133 | .bInterfaceClass = USB_CLASS_AUDIO, |
134 | .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, |
135 | }; |
136 | |
137 | static struct usb_interface_descriptor as_interface_alt_1_desc = { |
138 | .bLength = USB_DT_INTERFACE_SIZE, |
139 | .bDescriptorType = USB_DT_INTERFACE, |
140 | .bAlternateSetting = 1, |
141 | .bNumEndpoints = 1, |
142 | .bInterfaceClass = USB_CLASS_AUDIO, |
143 | .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, |
144 | }; |
145 | |
146 | /* B.4.2 Class-Specific AS Interface Descriptor */ |
147 | static struct uac1_as_header_descriptor = { |
148 | .bLength = UAC_DT_AS_HEADER_SIZE, |
149 | .bDescriptorType = USB_DT_CS_INTERFACE, |
150 | .bDescriptorSubtype = UAC_AS_GENERAL, |
151 | .bTerminalLink = INPUT_TERMINAL_ID, |
152 | .bDelay = 1, |
153 | .wFormatTag = UAC_FORMAT_TYPE_I_PCM, |
154 | }; |
155 | |
156 | DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1); |
157 | |
158 | static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = { |
159 | .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1), |
160 | .bDescriptorType = USB_DT_CS_INTERFACE, |
161 | .bDescriptorSubtype = UAC_FORMAT_TYPE, |
162 | .bFormatType = UAC_FORMAT_TYPE_I, |
163 | .bSubframeSize = 2, |
164 | .bBitResolution = 16, |
165 | .bSamFreqType = 1, |
166 | }; |
167 | |
168 | /* Standard ISO OUT Endpoint Descriptor */ |
169 | static struct usb_endpoint_descriptor as_out_ep_desc = { |
170 | .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, |
171 | .bDescriptorType = USB_DT_ENDPOINT, |
172 | .bEndpointAddress = USB_DIR_OUT, |
173 | .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE |
174 | | USB_ENDPOINT_XFER_ISOC, |
175 | .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE), |
176 | .bInterval = 4, |
177 | }; |
178 | |
179 | /* Class-specific AS ISO OUT Endpoint Descriptor */ |
180 | static struct uac_iso_endpoint_descriptor as_iso_out_desc = { |
181 | .bLength = UAC_ISO_ENDPOINT_DESC_SIZE, |
182 | .bDescriptorType = USB_DT_CS_ENDPOINT, |
183 | .bDescriptorSubtype = UAC_EP_GENERAL, |
184 | .bmAttributes = 1, |
185 | .bLockDelayUnits = 1, |
186 | .wLockDelay = cpu_to_le16(1), |
187 | }; |
188 | |
189 | static struct usb_descriptor_header *f_audio_desc[] = { |
190 | (struct usb_descriptor_header *)&ac_interface_desc, |
191 | (struct usb_descriptor_header *)&ac_header_desc, |
192 | |
193 | (struct usb_descriptor_header *)&input_terminal_desc, |
194 | (struct usb_descriptor_header *)&output_terminal_desc, |
195 | (struct usb_descriptor_header *)&feature_unit_desc, |
196 | |
197 | (struct usb_descriptor_header *)&as_interface_alt_0_desc, |
198 | (struct usb_descriptor_header *)&as_interface_alt_1_desc, |
199 | (struct usb_descriptor_header *)&as_header_desc, |
200 | |
201 | (struct usb_descriptor_header *)&as_type_i_desc, |
202 | |
203 | (struct usb_descriptor_header *)&as_out_ep_desc, |
204 | (struct usb_descriptor_header *)&as_iso_out_desc, |
205 | NULL, |
206 | }; |
207 | |
208 | enum { |
209 | STR_AC_IF, |
210 | STR_INPUT_TERMINAL, |
211 | STR_INPUT_TERMINAL_CH_NAMES, |
212 | STR_FEAT_DESC_0, |
213 | STR_OUTPUT_TERMINAL, |
214 | STR_AS_IF_ALT0, |
215 | STR_AS_IF_ALT1, |
216 | }; |
217 | |
218 | static struct usb_string strings_uac1[] = { |
219 | [STR_AC_IF].s = "AC Interface" , |
220 | [STR_INPUT_TERMINAL].s = "Input terminal" , |
221 | [STR_INPUT_TERMINAL_CH_NAMES].s = "Channels" , |
222 | [STR_FEAT_DESC_0].s = "Volume control & mute" , |
223 | [STR_OUTPUT_TERMINAL].s = "Output terminal" , |
224 | [STR_AS_IF_ALT0].s = "AS Interface" , |
225 | [STR_AS_IF_ALT1].s = "AS Interface" , |
226 | { }, |
227 | }; |
228 | |
229 | static struct usb_gadget_strings str_uac1 = { |
230 | .language = 0x0409, /* en-us */ |
231 | .strings = strings_uac1, |
232 | }; |
233 | |
234 | static struct usb_gadget_strings *uac1_strings[] = { |
235 | &str_uac1, |
236 | NULL, |
237 | }; |
238 | |
239 | /* |
240 | * This function is an ALSA sound card following USB Audio Class Spec 1.0. |
241 | */ |
242 | |
243 | /*-------------------------------------------------------------------------*/ |
244 | struct f_audio_buf { |
245 | u8 *buf; |
246 | int actual; |
247 | struct list_head list; |
248 | }; |
249 | |
250 | static struct f_audio_buf *f_audio_buffer_alloc(int buf_size) |
251 | { |
252 | struct f_audio_buf *copy_buf; |
253 | |
254 | copy_buf = kzalloc(size: sizeof *copy_buf, GFP_ATOMIC); |
255 | if (!copy_buf) |
256 | return ERR_PTR(error: -ENOMEM); |
257 | |
258 | copy_buf->buf = kzalloc(size: buf_size, GFP_ATOMIC); |
259 | if (!copy_buf->buf) { |
260 | kfree(objp: copy_buf); |
261 | return ERR_PTR(error: -ENOMEM); |
262 | } |
263 | |
264 | return copy_buf; |
265 | } |
266 | |
267 | static void f_audio_buffer_free(struct f_audio_buf *audio_buf) |
268 | { |
269 | kfree(objp: audio_buf->buf); |
270 | kfree(objp: audio_buf); |
271 | } |
272 | /*-------------------------------------------------------------------------*/ |
273 | |
274 | struct f_audio { |
275 | struct gaudio card; |
276 | |
277 | u8 ac_intf, ac_alt; |
278 | u8 as_intf, as_alt; |
279 | |
280 | /* endpoints handle full and/or high speeds */ |
281 | struct usb_ep *out_ep; |
282 | |
283 | spinlock_t lock; |
284 | struct f_audio_buf *copy_buf; |
285 | struct work_struct playback_work; |
286 | struct list_head play_queue; |
287 | |
288 | /* Control Set command */ |
289 | struct list_head cs; |
290 | u8 set_cmd; |
291 | struct usb_audio_control *set_con; |
292 | }; |
293 | |
294 | static inline struct f_audio *func_to_audio(struct usb_function *f) |
295 | { |
296 | return container_of(f, struct f_audio, card.func); |
297 | } |
298 | |
299 | /*-------------------------------------------------------------------------*/ |
300 | |
301 | static void f_audio_playback_work(struct work_struct *data) |
302 | { |
303 | struct f_audio *audio = container_of(data, struct f_audio, |
304 | playback_work); |
305 | struct f_audio_buf *play_buf; |
306 | |
307 | spin_lock_irq(lock: &audio->lock); |
308 | if (list_empty(head: &audio->play_queue)) { |
309 | spin_unlock_irq(lock: &audio->lock); |
310 | return; |
311 | } |
312 | play_buf = list_first_entry(&audio->play_queue, |
313 | struct f_audio_buf, list); |
314 | list_del(entry: &play_buf->list); |
315 | spin_unlock_irq(lock: &audio->lock); |
316 | |
317 | u_audio_playback(card: &audio->card, buf: play_buf->buf, count: play_buf->actual); |
318 | f_audio_buffer_free(audio_buf: play_buf); |
319 | } |
320 | |
321 | static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req) |
322 | { |
323 | struct f_audio *audio = req->context; |
324 | struct usb_composite_dev *cdev = audio->card.func.config->cdev; |
325 | struct f_audio_buf *copy_buf = audio->copy_buf; |
326 | struct f_uac1_legacy_opts *opts; |
327 | int audio_buf_size; |
328 | int err; |
329 | |
330 | opts = container_of(audio->card.func.fi, struct f_uac1_legacy_opts, |
331 | func_inst); |
332 | audio_buf_size = opts->audio_buf_size; |
333 | |
334 | if (!copy_buf) |
335 | return -EINVAL; |
336 | |
337 | /* Copy buffer is full, add it to the play_queue */ |
338 | if (audio_buf_size - copy_buf->actual < req->actual) { |
339 | spin_lock_irq(lock: &audio->lock); |
340 | list_add_tail(new: ©_buf->list, head: &audio->play_queue); |
341 | spin_unlock_irq(lock: &audio->lock); |
342 | schedule_work(work: &audio->playback_work); |
343 | copy_buf = f_audio_buffer_alloc(buf_size: audio_buf_size); |
344 | if (IS_ERR(ptr: copy_buf)) |
345 | return -ENOMEM; |
346 | } |
347 | |
348 | memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual); |
349 | copy_buf->actual += req->actual; |
350 | audio->copy_buf = copy_buf; |
351 | |
352 | err = usb_ep_queue(ep, req, GFP_ATOMIC); |
353 | if (err) |
354 | ERROR(cdev, "%s queue req: %d\n" , ep->name, err); |
355 | |
356 | return 0; |
357 | |
358 | } |
359 | |
360 | static void f_audio_complete(struct usb_ep *ep, struct usb_request *req) |
361 | { |
362 | struct f_audio *audio = req->context; |
363 | int status = req->status; |
364 | u32 data = 0; |
365 | struct usb_ep *out_ep = audio->out_ep; |
366 | |
367 | switch (status) { |
368 | |
369 | case 0: /* normal completion? */ |
370 | if (ep == out_ep) |
371 | f_audio_out_ep_complete(ep, req); |
372 | else if (audio->set_con) { |
373 | memcpy(&data, req->buf, req->length); |
374 | audio->set_con->set(audio->set_con, audio->set_cmd, |
375 | le16_to_cpu(data)); |
376 | audio->set_con = NULL; |
377 | } |
378 | break; |
379 | default: |
380 | break; |
381 | } |
382 | } |
383 | |
384 | static int audio_set_intf_req(struct usb_function *f, |
385 | const struct usb_ctrlrequest *ctrl) |
386 | { |
387 | struct f_audio *audio = func_to_audio(f); |
388 | struct usb_composite_dev *cdev = f->config->cdev; |
389 | struct usb_request *req = cdev->req; |
390 | u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); |
391 | u16 len = le16_to_cpu(ctrl->wLength); |
392 | u16 w_value = le16_to_cpu(ctrl->wValue); |
393 | u8 con_sel = (w_value >> 8) & 0xFF; |
394 | u8 cmd = (ctrl->bRequest & 0x0F); |
395 | struct usb_audio_control_selector *cs; |
396 | struct usb_audio_control *con; |
397 | |
398 | DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n" , |
399 | ctrl->bRequest, w_value, len, id); |
400 | |
401 | list_for_each_entry(cs, &audio->cs, list) { |
402 | if (cs->id == id) { |
403 | list_for_each_entry(con, &cs->control, list) { |
404 | if (con->type == con_sel) { |
405 | audio->set_con = con; |
406 | break; |
407 | } |
408 | } |
409 | break; |
410 | } |
411 | } |
412 | |
413 | audio->set_cmd = cmd; |
414 | req->context = audio; |
415 | req->complete = f_audio_complete; |
416 | |
417 | return len; |
418 | } |
419 | |
420 | static int audio_get_intf_req(struct usb_function *f, |
421 | const struct usb_ctrlrequest *ctrl) |
422 | { |
423 | struct f_audio *audio = func_to_audio(f); |
424 | struct usb_composite_dev *cdev = f->config->cdev; |
425 | struct usb_request *req = cdev->req; |
426 | int value = -EOPNOTSUPP; |
427 | u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); |
428 | u16 len = le16_to_cpu(ctrl->wLength); |
429 | u16 w_value = le16_to_cpu(ctrl->wValue); |
430 | u8 con_sel = (w_value >> 8) & 0xFF; |
431 | u8 cmd = (ctrl->bRequest & 0x0F); |
432 | struct usb_audio_control_selector *cs; |
433 | struct usb_audio_control *con; |
434 | |
435 | DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n" , |
436 | ctrl->bRequest, w_value, len, id); |
437 | |
438 | list_for_each_entry(cs, &audio->cs, list) { |
439 | if (cs->id == id) { |
440 | list_for_each_entry(con, &cs->control, list) { |
441 | if (con->type == con_sel && con->get) { |
442 | value = con->get(con, cmd); |
443 | break; |
444 | } |
445 | } |
446 | break; |
447 | } |
448 | } |
449 | |
450 | req->context = audio; |
451 | req->complete = f_audio_complete; |
452 | len = min_t(size_t, sizeof(value), len); |
453 | memcpy(req->buf, &value, len); |
454 | |
455 | return len; |
456 | } |
457 | |
458 | static int audio_set_endpoint_req(struct usb_function *f, |
459 | const struct usb_ctrlrequest *ctrl) |
460 | { |
461 | struct usb_composite_dev *cdev = f->config->cdev; |
462 | int value = -EOPNOTSUPP; |
463 | u16 ep = le16_to_cpu(ctrl->wIndex); |
464 | u16 len = le16_to_cpu(ctrl->wLength); |
465 | u16 w_value = le16_to_cpu(ctrl->wValue); |
466 | |
467 | DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n" , |
468 | ctrl->bRequest, w_value, len, ep); |
469 | |
470 | switch (ctrl->bRequest) { |
471 | case UAC_SET_CUR: |
472 | value = len; |
473 | break; |
474 | |
475 | case UAC_SET_MIN: |
476 | break; |
477 | |
478 | case UAC_SET_MAX: |
479 | break; |
480 | |
481 | case UAC_SET_RES: |
482 | break; |
483 | |
484 | case UAC_SET_MEM: |
485 | break; |
486 | |
487 | default: |
488 | break; |
489 | } |
490 | |
491 | return value; |
492 | } |
493 | |
494 | static int audio_get_endpoint_req(struct usb_function *f, |
495 | const struct usb_ctrlrequest *ctrl) |
496 | { |
497 | struct usb_composite_dev *cdev = f->config->cdev; |
498 | int value = -EOPNOTSUPP; |
499 | u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); |
500 | u16 len = le16_to_cpu(ctrl->wLength); |
501 | u16 w_value = le16_to_cpu(ctrl->wValue); |
502 | |
503 | DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n" , |
504 | ctrl->bRequest, w_value, len, ep); |
505 | |
506 | switch (ctrl->bRequest) { |
507 | case UAC_GET_CUR: |
508 | case UAC_GET_MIN: |
509 | case UAC_GET_MAX: |
510 | case UAC_GET_RES: |
511 | value = len; |
512 | break; |
513 | case UAC_GET_MEM: |
514 | break; |
515 | default: |
516 | break; |
517 | } |
518 | |
519 | return value; |
520 | } |
521 | |
522 | static int |
523 | f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) |
524 | { |
525 | struct usb_composite_dev *cdev = f->config->cdev; |
526 | struct usb_request *req = cdev->req; |
527 | int value = -EOPNOTSUPP; |
528 | u16 w_index = le16_to_cpu(ctrl->wIndex); |
529 | u16 w_value = le16_to_cpu(ctrl->wValue); |
530 | u16 w_length = le16_to_cpu(ctrl->wLength); |
531 | |
532 | /* composite driver infrastructure handles everything; interface |
533 | * activation uses set_alt(). |
534 | */ |
535 | switch (ctrl->bRequestType) { |
536 | case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE: |
537 | value = audio_set_intf_req(f, ctrl); |
538 | break; |
539 | |
540 | case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE: |
541 | value = audio_get_intf_req(f, ctrl); |
542 | break; |
543 | |
544 | case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: |
545 | value = audio_set_endpoint_req(f, ctrl); |
546 | break; |
547 | |
548 | case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: |
549 | value = audio_get_endpoint_req(f, ctrl); |
550 | break; |
551 | |
552 | default: |
553 | ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n" , |
554 | ctrl->bRequestType, ctrl->bRequest, |
555 | w_value, w_index, w_length); |
556 | } |
557 | |
558 | /* respond with data transfer or status phase? */ |
559 | if (value >= 0) { |
560 | DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n" , |
561 | ctrl->bRequestType, ctrl->bRequest, |
562 | w_value, w_index, w_length); |
563 | req->zero = 0; |
564 | req->length = value; |
565 | value = usb_ep_queue(ep: cdev->gadget->ep0, req, GFP_ATOMIC); |
566 | if (value < 0) |
567 | ERROR(cdev, "audio response on err %d\n" , value); |
568 | } |
569 | |
570 | /* device either stalls (value < 0) or reports success */ |
571 | return value; |
572 | } |
573 | |
574 | static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt) |
575 | { |
576 | struct f_audio *audio = func_to_audio(f); |
577 | struct usb_composite_dev *cdev = f->config->cdev; |
578 | struct usb_ep *out_ep = audio->out_ep; |
579 | struct usb_request *req; |
580 | struct f_uac1_legacy_opts *opts; |
581 | int req_buf_size, req_count, audio_buf_size; |
582 | int i = 0, err = 0; |
583 | |
584 | DBG(cdev, "intf %d, alt %d\n" , intf, alt); |
585 | |
586 | opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst); |
587 | req_buf_size = opts->req_buf_size; |
588 | req_count = opts->req_count; |
589 | audio_buf_size = opts->audio_buf_size; |
590 | |
591 | /* No i/f has more than 2 alt settings */ |
592 | if (alt > 1) { |
593 | ERROR(cdev, "%s:%d Error!\n" , __func__, __LINE__); |
594 | return -EINVAL; |
595 | } |
596 | |
597 | if (intf == audio->ac_intf) { |
598 | /* Control I/f has only 1 AltSetting - 0 */ |
599 | if (alt) { |
600 | ERROR(cdev, "%s:%d Error!\n" , __func__, __LINE__); |
601 | return -EINVAL; |
602 | } |
603 | return 0; |
604 | } else if (intf == audio->as_intf) { |
605 | if (alt == 1) { |
606 | err = config_ep_by_speed(g: cdev->gadget, f, ep: out_ep); |
607 | if (err) |
608 | return err; |
609 | |
610 | usb_ep_enable(ep: out_ep); |
611 | audio->copy_buf = f_audio_buffer_alloc(buf_size: audio_buf_size); |
612 | if (IS_ERR(ptr: audio->copy_buf)) |
613 | return -ENOMEM; |
614 | |
615 | /* |
616 | * allocate a bunch of read buffers |
617 | * and queue them all at once. |
618 | */ |
619 | for (i = 0; i < req_count && err == 0; i++) { |
620 | req = usb_ep_alloc_request(ep: out_ep, GFP_ATOMIC); |
621 | if (req) { |
622 | req->buf = kzalloc(size: req_buf_size, |
623 | GFP_ATOMIC); |
624 | if (req->buf) { |
625 | req->length = req_buf_size; |
626 | req->context = audio; |
627 | req->complete = |
628 | f_audio_complete; |
629 | err = usb_ep_queue(ep: out_ep, |
630 | req, GFP_ATOMIC); |
631 | if (err) |
632 | ERROR(cdev, |
633 | "%s queue req: %d\n" , |
634 | out_ep->name, err); |
635 | } else |
636 | err = -ENOMEM; |
637 | } else |
638 | err = -ENOMEM; |
639 | } |
640 | |
641 | } else { |
642 | struct f_audio_buf *copy_buf = audio->copy_buf; |
643 | if (copy_buf) { |
644 | list_add_tail(new: ©_buf->list, |
645 | head: &audio->play_queue); |
646 | schedule_work(work: &audio->playback_work); |
647 | } |
648 | } |
649 | audio->as_alt = alt; |
650 | } |
651 | |
652 | return err; |
653 | } |
654 | |
655 | static int f_audio_get_alt(struct usb_function *f, unsigned intf) |
656 | { |
657 | struct f_audio *audio = func_to_audio(f); |
658 | struct usb_composite_dev *cdev = f->config->cdev; |
659 | |
660 | if (intf == audio->ac_intf) |
661 | return audio->ac_alt; |
662 | else if (intf == audio->as_intf) |
663 | return audio->as_alt; |
664 | else |
665 | ERROR(cdev, "%s:%d Invalid Interface %d!\n" , |
666 | __func__, __LINE__, intf); |
667 | |
668 | return -EINVAL; |
669 | } |
670 | |
671 | static void f_audio_disable(struct usb_function *f) |
672 | { |
673 | return; |
674 | } |
675 | |
676 | /*-------------------------------------------------------------------------*/ |
677 | |
678 | static void f_audio_build_desc(struct f_audio *audio) |
679 | { |
680 | struct gaudio *card = &audio->card; |
681 | u8 *sam_freq; |
682 | int rate; |
683 | |
684 | /* Set channel numbers */ |
685 | input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card); |
686 | as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card); |
687 | |
688 | /* Set sample rates */ |
689 | rate = u_audio_get_playback_rate(card); |
690 | sam_freq = as_type_i_desc.tSamFreq[0]; |
691 | memcpy(sam_freq, &rate, 3); |
692 | |
693 | /* Todo: Set Sample bits and other parameters */ |
694 | |
695 | return; |
696 | } |
697 | |
698 | /* audio function driver setup/binding */ |
699 | static int |
700 | f_audio_bind(struct usb_configuration *c, struct usb_function *f) |
701 | { |
702 | struct usb_composite_dev *cdev = c->cdev; |
703 | struct f_audio *audio = func_to_audio(f); |
704 | struct usb_string *us; |
705 | int status; |
706 | struct usb_ep *ep = NULL; |
707 | struct f_uac1_legacy_opts *audio_opts; |
708 | |
709 | audio_opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst); |
710 | audio->card.gadget = c->cdev->gadget; |
711 | /* set up ASLA audio devices */ |
712 | if (!audio_opts->bound) { |
713 | status = gaudio_setup(card: &audio->card); |
714 | if (status < 0) |
715 | return status; |
716 | audio_opts->bound = true; |
717 | } |
718 | us = usb_gstrings_attach(cdev, sp: uac1_strings, ARRAY_SIZE(strings_uac1)); |
719 | if (IS_ERR(ptr: us)) |
720 | return PTR_ERR(ptr: us); |
721 | ac_interface_desc.iInterface = us[STR_AC_IF].id; |
722 | input_terminal_desc.iTerminal = us[STR_INPUT_TERMINAL].id; |
723 | input_terminal_desc.iChannelNames = us[STR_INPUT_TERMINAL_CH_NAMES].id; |
724 | feature_unit_desc.iFeature = us[STR_FEAT_DESC_0].id; |
725 | output_terminal_desc.iTerminal = us[STR_OUTPUT_TERMINAL].id; |
726 | as_interface_alt_0_desc.iInterface = us[STR_AS_IF_ALT0].id; |
727 | as_interface_alt_1_desc.iInterface = us[STR_AS_IF_ALT1].id; |
728 | |
729 | |
730 | f_audio_build_desc(audio); |
731 | |
732 | /* allocate instance-specific interface IDs, and patch descriptors */ |
733 | status = usb_interface_id(c, f); |
734 | if (status < 0) |
735 | goto fail; |
736 | ac_interface_desc.bInterfaceNumber = status; |
737 | audio->ac_intf = status; |
738 | audio->ac_alt = 0; |
739 | |
740 | status = usb_interface_id(c, f); |
741 | if (status < 0) |
742 | goto fail; |
743 | as_interface_alt_0_desc.bInterfaceNumber = status; |
744 | as_interface_alt_1_desc.bInterfaceNumber = status; |
745 | audio->as_intf = status; |
746 | audio->as_alt = 0; |
747 | |
748 | status = -ENODEV; |
749 | |
750 | /* allocate instance-specific endpoints */ |
751 | ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc); |
752 | if (!ep) |
753 | goto fail; |
754 | audio->out_ep = ep; |
755 | audio->out_ep->desc = &as_out_ep_desc; |
756 | |
757 | /* copy descriptors, and track endpoint copies */ |
758 | status = usb_assign_descriptors(f, fs: f_audio_desc, hs: f_audio_desc, NULL, |
759 | NULL); |
760 | if (status) |
761 | goto fail; |
762 | return 0; |
763 | |
764 | fail: |
765 | gaudio_cleanup(the_card: &audio->card); |
766 | return status; |
767 | } |
768 | |
769 | /*-------------------------------------------------------------------------*/ |
770 | |
771 | static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value) |
772 | { |
773 | con->data[cmd] = value; |
774 | |
775 | return 0; |
776 | } |
777 | |
778 | static int generic_get_cmd(struct usb_audio_control *con, u8 cmd) |
779 | { |
780 | return con->data[cmd]; |
781 | } |
782 | |
783 | /* Todo: add more control selecotor dynamically */ |
784 | static int control_selector_init(struct f_audio *audio) |
785 | { |
786 | INIT_LIST_HEAD(list: &audio->cs); |
787 | list_add(new: &feature_unit.list, head: &audio->cs); |
788 | |
789 | INIT_LIST_HEAD(list: &feature_unit.control); |
790 | list_add(new: &mute_control.list, head: &feature_unit.control); |
791 | list_add(new: &volume_control.list, head: &feature_unit.control); |
792 | |
793 | volume_control.data[UAC__CUR] = 0xffc0; |
794 | volume_control.data[UAC__MIN] = 0xe3a0; |
795 | volume_control.data[UAC__MAX] = 0xfff0; |
796 | volume_control.data[UAC__RES] = 0x0030; |
797 | |
798 | return 0; |
799 | } |
800 | |
801 | static inline |
802 | struct f_uac1_legacy_opts *to_f_uac1_opts(struct config_item *item) |
803 | { |
804 | return container_of(to_config_group(item), struct f_uac1_legacy_opts, |
805 | func_inst.group); |
806 | } |
807 | |
808 | static void f_uac1_attr_release(struct config_item *item) |
809 | { |
810 | struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); |
811 | |
812 | usb_put_function_instance(fi: &opts->func_inst); |
813 | } |
814 | |
815 | static struct configfs_item_operations f_uac1_item_ops = { |
816 | .release = f_uac1_attr_release, |
817 | }; |
818 | |
819 | #define UAC1_INT_ATTRIBUTE(name) \ |
820 | static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \ |
821 | char *page) \ |
822 | { \ |
823 | struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \ |
824 | int result; \ |
825 | \ |
826 | mutex_lock(&opts->lock); \ |
827 | result = sprintf(page, "%u\n", opts->name); \ |
828 | mutex_unlock(&opts->lock); \ |
829 | \ |
830 | return result; \ |
831 | } \ |
832 | \ |
833 | static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \ |
834 | const char *page, size_t len) \ |
835 | { \ |
836 | struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \ |
837 | int ret; \ |
838 | u32 num; \ |
839 | \ |
840 | mutex_lock(&opts->lock); \ |
841 | if (opts->refcnt) { \ |
842 | ret = -EBUSY; \ |
843 | goto end; \ |
844 | } \ |
845 | \ |
846 | ret = kstrtou32(page, 0, &num); \ |
847 | if (ret) \ |
848 | goto end; \ |
849 | \ |
850 | opts->name = num; \ |
851 | ret = len; \ |
852 | \ |
853 | end: \ |
854 | mutex_unlock(&opts->lock); \ |
855 | return ret; \ |
856 | } \ |
857 | \ |
858 | CONFIGFS_ATTR(f_uac1_opts_, name) |
859 | |
860 | UAC1_INT_ATTRIBUTE(req_buf_size); |
861 | UAC1_INT_ATTRIBUTE(req_count); |
862 | UAC1_INT_ATTRIBUTE(audio_buf_size); |
863 | |
864 | #define UAC1_STR_ATTRIBUTE(name) \ |
865 | static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \ |
866 | char *page) \ |
867 | { \ |
868 | struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \ |
869 | int result; \ |
870 | \ |
871 | mutex_lock(&opts->lock); \ |
872 | result = sprintf(page, "%s\n", opts->name); \ |
873 | mutex_unlock(&opts->lock); \ |
874 | \ |
875 | return result; \ |
876 | } \ |
877 | \ |
878 | static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \ |
879 | const char *page, size_t len) \ |
880 | { \ |
881 | struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \ |
882 | int ret = -EBUSY; \ |
883 | char *tmp; \ |
884 | \ |
885 | mutex_lock(&opts->lock); \ |
886 | if (opts->refcnt) \ |
887 | goto end; \ |
888 | \ |
889 | tmp = kstrndup(page, len, GFP_KERNEL); \ |
890 | if (tmp) { \ |
891 | ret = -ENOMEM; \ |
892 | goto end; \ |
893 | } \ |
894 | if (opts->name##_alloc) \ |
895 | kfree(opts->name); \ |
896 | opts->name##_alloc = true; \ |
897 | opts->name = tmp; \ |
898 | ret = len; \ |
899 | \ |
900 | end: \ |
901 | mutex_unlock(&opts->lock); \ |
902 | return ret; \ |
903 | } \ |
904 | \ |
905 | CONFIGFS_ATTR(f_uac1_opts_, name) |
906 | |
907 | UAC1_STR_ATTRIBUTE(fn_play); |
908 | UAC1_STR_ATTRIBUTE(fn_cap); |
909 | UAC1_STR_ATTRIBUTE(fn_cntl); |
910 | |
911 | static struct configfs_attribute *f_uac1_attrs[] = { |
912 | &f_uac1_opts_attr_req_buf_size, |
913 | &f_uac1_opts_attr_req_count, |
914 | &f_uac1_opts_attr_audio_buf_size, |
915 | &f_uac1_opts_attr_fn_play, |
916 | &f_uac1_opts_attr_fn_cap, |
917 | &f_uac1_opts_attr_fn_cntl, |
918 | NULL, |
919 | }; |
920 | |
921 | static const struct config_item_type f_uac1_func_type = { |
922 | .ct_item_ops = &f_uac1_item_ops, |
923 | .ct_attrs = f_uac1_attrs, |
924 | .ct_owner = THIS_MODULE, |
925 | }; |
926 | |
927 | static void f_audio_free_inst(struct usb_function_instance *f) |
928 | { |
929 | struct f_uac1_legacy_opts *opts; |
930 | |
931 | opts = container_of(f, struct f_uac1_legacy_opts, func_inst); |
932 | if (opts->fn_play_alloc) |
933 | kfree(objp: opts->fn_play); |
934 | if (opts->fn_cap_alloc) |
935 | kfree(objp: opts->fn_cap); |
936 | if (opts->fn_cntl_alloc) |
937 | kfree(objp: opts->fn_cntl); |
938 | kfree(objp: opts); |
939 | } |
940 | |
941 | static struct usb_function_instance *f_audio_alloc_inst(void) |
942 | { |
943 | struct f_uac1_legacy_opts *opts; |
944 | |
945 | opts = kzalloc(size: sizeof(*opts), GFP_KERNEL); |
946 | if (!opts) |
947 | return ERR_PTR(error: -ENOMEM); |
948 | |
949 | mutex_init(&opts->lock); |
950 | opts->func_inst.free_func_inst = f_audio_free_inst; |
951 | |
952 | config_group_init_type_name(group: &opts->func_inst.group, name: "" , |
953 | type: &f_uac1_func_type); |
954 | |
955 | opts->req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE; |
956 | opts->req_count = UAC1_REQ_COUNT; |
957 | opts->audio_buf_size = UAC1_AUDIO_BUF_SIZE; |
958 | opts->fn_play = FILE_PCM_PLAYBACK; |
959 | opts->fn_cap = FILE_PCM_CAPTURE; |
960 | opts->fn_cntl = FILE_CONTROL; |
961 | return &opts->func_inst; |
962 | } |
963 | |
964 | static void f_audio_free(struct usb_function *f) |
965 | { |
966 | struct f_audio *audio = func_to_audio(f); |
967 | struct f_uac1_legacy_opts *opts; |
968 | |
969 | gaudio_cleanup(the_card: &audio->card); |
970 | opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst); |
971 | kfree(objp: audio); |
972 | mutex_lock(&opts->lock); |
973 | --opts->refcnt; |
974 | mutex_unlock(lock: &opts->lock); |
975 | } |
976 | |
977 | static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f) |
978 | { |
979 | usb_free_all_descriptors(f); |
980 | } |
981 | |
982 | static struct usb_function *f_audio_alloc(struct usb_function_instance *fi) |
983 | { |
984 | struct f_audio *audio; |
985 | struct f_uac1_legacy_opts *opts; |
986 | |
987 | /* allocate and initialize one new instance */ |
988 | audio = kzalloc(size: sizeof(*audio), GFP_KERNEL); |
989 | if (!audio) |
990 | return ERR_PTR(error: -ENOMEM); |
991 | |
992 | audio->card.func.name = "g_audio" ; |
993 | |
994 | opts = container_of(fi, struct f_uac1_legacy_opts, func_inst); |
995 | mutex_lock(&opts->lock); |
996 | ++opts->refcnt; |
997 | mutex_unlock(lock: &opts->lock); |
998 | INIT_LIST_HEAD(list: &audio->play_queue); |
999 | spin_lock_init(&audio->lock); |
1000 | |
1001 | audio->card.func.bind = f_audio_bind; |
1002 | audio->card.func.unbind = f_audio_unbind; |
1003 | audio->card.func.set_alt = f_audio_set_alt; |
1004 | audio->card.func.get_alt = f_audio_get_alt; |
1005 | audio->card.func.setup = f_audio_setup; |
1006 | audio->card.func.disable = f_audio_disable; |
1007 | audio->card.func.free_func = f_audio_free; |
1008 | |
1009 | control_selector_init(audio); |
1010 | |
1011 | INIT_WORK(&audio->playback_work, f_audio_playback_work); |
1012 | |
1013 | return &audio->card.func; |
1014 | } |
1015 | |
1016 | DECLARE_USB_FUNCTION_INIT(uac1_legacy, f_audio_alloc_inst, f_audio_alloc); |
1017 | MODULE_LICENSE("GPL" ); |
1018 | MODULE_AUTHOR("Bryan Wu" ); |
1019 | |