1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * f_uac1.c -- USB Audio Class 1.0 Function (using u_audio API) 4 * 5 * Copyright (C) 2016 Ruslan Bilovol <ruslan.bilovol@gmail.com> 6 * Copyright (C) 2021 Julian Scheel <julian@jusst.de> 7 * 8 * This driver doesn't expect any real Audio codec to be present 9 * on the device - the audio streams are simply sinked to and 10 * sourced from a virtual ALSA sound card created. 11 * 12 * This file is based on f_uac1.c which is 13 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org> 14 * Copyright (C) 2008 Analog Devices, Inc 15 */ 16 17 #include <linux/usb/audio.h> 18 #include <linux/module.h> 19 20 #include "u_audio.h" 21 #include "u_uac1.h" 22 23 /* UAC1 spec: 3.7.2.3 Audio Channel Cluster Format */ 24 #define UAC1_CHANNEL_MASK 0x0FFF 25 26 #define USB_OUT_FU_ID (out_feature_unit_desc->bUnitID) 27 #define USB_IN_FU_ID (in_feature_unit_desc->bUnitID) 28 29 #define EPIN_EN(_opts) ((_opts)->p_chmask != 0) 30 #define EPOUT_EN(_opts) ((_opts)->c_chmask != 0) 31 #define FUIN_EN(_opts) ((_opts)->p_mute_present \ 32 || (_opts)->p_volume_present) 33 #define FUOUT_EN(_opts) ((_opts)->c_mute_present \ 34 || (_opts)->c_volume_present) 35 36 struct f_uac1 { 37 struct g_audio g_audio; 38 u8 ac_intf, as_in_intf, as_out_intf; 39 u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */ 40 41 struct usb_ctrlrequest setup_cr; /* will be used in data stage */ 42 43 /* Interrupt IN endpoint of AC interface */ 44 struct usb_ep *int_ep; 45 atomic_t int_count; 46 int ctl_id; /* EP id */ 47 int c_srate; /* current capture srate */ 48 int p_srate; /* current playback prate */ 49 }; 50 51 static inline struct f_uac1 *func_to_uac1(struct usb_function *f) 52 { 53 return container_of(f, struct f_uac1, g_audio.func); 54 } 55 56 static inline struct f_uac1_opts *g_audio_to_uac1_opts(struct g_audio *audio) 57 { 58 return container_of(audio->func.fi, struct f_uac1_opts, func_inst); 59 } 60 61 /* 62 * DESCRIPTORS ... most are static, but strings and full 63 * configuration descriptors are built on demand. 64 */ 65 66 /* 67 * We have three interfaces - one AudioControl and two AudioStreaming 68 * 69 * The driver implements a simple UAC_1 topology. 70 * USB-OUT -> IT_1 -> OT_2 -> ALSA_Capture 71 * ALSA_Playback -> IT_3 -> OT_4 -> USB-IN 72 */ 73 74 /* B.3.1 Standard AC Interface Descriptor */ 75 static struct usb_interface_descriptor ac_interface_desc = { 76 .bLength = USB_DT_INTERFACE_SIZE, 77 .bDescriptorType = USB_DT_INTERFACE, 78 /* .bNumEndpoints = DYNAMIC */ 79 .bInterfaceClass = USB_CLASS_AUDIO, 80 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, 81 }; 82 83 /* B.3.2 Class-Specific AC Interface Descriptor */ 84 static struct uac1_ac_header_descriptor *ac_header_desc; 85 86 static struct uac_input_terminal_descriptor usb_out_it_desc = { 87 .bLength = UAC_DT_INPUT_TERMINAL_SIZE, 88 .bDescriptorType = USB_DT_CS_INTERFACE, 89 .bDescriptorSubtype = UAC_INPUT_TERMINAL, 90 /* .bTerminalID = DYNAMIC */ 91 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING), 92 .bAssocTerminal = 0, 93 .wChannelConfig = cpu_to_le16(0x3), 94 }; 95 96 static struct uac1_output_terminal_descriptor io_out_ot_desc = { 97 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE, 98 .bDescriptorType = USB_DT_CS_INTERFACE, 99 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, 100 /* .bTerminalID = DYNAMIC */ 101 .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_SPEAKER), 102 .bAssocTerminal = 0, 103 /* .bSourceID = DYNAMIC */ 104 }; 105 106 static struct uac_input_terminal_descriptor io_in_it_desc = { 107 .bLength = UAC_DT_INPUT_TERMINAL_SIZE, 108 .bDescriptorType = USB_DT_CS_INTERFACE, 109 .bDescriptorSubtype = UAC_INPUT_TERMINAL, 110 /* .bTerminalID = DYNAMIC */ 111 .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_MICROPHONE), 112 .bAssocTerminal = 0, 113 .wChannelConfig = cpu_to_le16(0x3), 114 }; 115 116 static struct uac1_output_terminal_descriptor usb_in_ot_desc = { 117 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE, 118 .bDescriptorType = USB_DT_CS_INTERFACE, 119 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, 120 /* .bTerminalID = DYNAMIC */ 121 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING), 122 .bAssocTerminal = 0, 123 /* .bSourceID = DYNAMIC */ 124 }; 125 126 static struct uac_feature_unit_descriptor *in_feature_unit_desc; 127 static struct uac_feature_unit_descriptor *out_feature_unit_desc; 128 129 /* AC IN Interrupt Endpoint */ 130 static struct usb_endpoint_descriptor ac_int_ep_desc = { 131 .bLength = USB_DT_ENDPOINT_SIZE, 132 .bDescriptorType = USB_DT_ENDPOINT, 133 .bEndpointAddress = USB_DIR_IN, 134 .bmAttributes = USB_ENDPOINT_XFER_INT, 135 .wMaxPacketSize = cpu_to_le16(2), 136 .bInterval = 4, 137 }; 138 139 /* B.4.1 Standard AS Interface Descriptor */ 140 static struct usb_interface_descriptor as_out_interface_alt_0_desc = { 141 .bLength = USB_DT_INTERFACE_SIZE, 142 .bDescriptorType = USB_DT_INTERFACE, 143 .bAlternateSetting = 0, 144 .bNumEndpoints = 0, 145 .bInterfaceClass = USB_CLASS_AUDIO, 146 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 147 }; 148 149 static struct usb_interface_descriptor as_out_interface_alt_1_desc = { 150 .bLength = USB_DT_INTERFACE_SIZE, 151 .bDescriptorType = USB_DT_INTERFACE, 152 .bAlternateSetting = 1, 153 .bNumEndpoints = 1, 154 .bInterfaceClass = USB_CLASS_AUDIO, 155 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 156 }; 157 158 static struct usb_interface_descriptor as_in_interface_alt_0_desc = { 159 .bLength = USB_DT_INTERFACE_SIZE, 160 .bDescriptorType = USB_DT_INTERFACE, 161 .bAlternateSetting = 0, 162 .bNumEndpoints = 0, 163 .bInterfaceClass = USB_CLASS_AUDIO, 164 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 165 }; 166 167 static struct usb_interface_descriptor as_in_interface_alt_1_desc = { 168 .bLength = USB_DT_INTERFACE_SIZE, 169 .bDescriptorType = USB_DT_INTERFACE, 170 .bAlternateSetting = 1, 171 .bNumEndpoints = 1, 172 .bInterfaceClass = USB_CLASS_AUDIO, 173 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 174 }; 175 176 /* B.4.2 Class-Specific AS Interface Descriptor */ 177 static struct uac1_as_header_descriptor as_out_header_desc = { 178 .bLength = UAC_DT_AS_HEADER_SIZE, 179 .bDescriptorType = USB_DT_CS_INTERFACE, 180 .bDescriptorSubtype = UAC_AS_GENERAL, 181 /* .bTerminalLink = DYNAMIC */ 182 .bDelay = 1, 183 .wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM), 184 }; 185 186 static struct uac1_as_header_descriptor as_in_header_desc = { 187 .bLength = UAC_DT_AS_HEADER_SIZE, 188 .bDescriptorType = USB_DT_CS_INTERFACE, 189 .bDescriptorSubtype = UAC_AS_GENERAL, 190 /* .bTerminalLink = DYNAMIC */ 191 .bDelay = 1, 192 .wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM), 193 }; 194 195 DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(UAC_MAX_RATES); 196 #define uac_format_type_i_discrete_descriptor \ 197 uac_format_type_i_discrete_descriptor_##UAC_MAX_RATES 198 199 static struct uac_format_type_i_discrete_descriptor as_out_type_i_desc = { 200 .bLength = 0, /* filled on rate setup */ 201 .bDescriptorType = USB_DT_CS_INTERFACE, 202 .bDescriptorSubtype = UAC_FORMAT_TYPE, 203 .bFormatType = UAC_FORMAT_TYPE_I, 204 .bSubframeSize = 2, 205 .bBitResolution = 16, 206 .bSamFreqType = 0, /* filled on rate setup */ 207 }; 208 209 /* Standard ISO OUT Endpoint Descriptor */ 210 static struct usb_endpoint_descriptor as_out_ep_desc = { 211 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, 212 .bDescriptorType = USB_DT_ENDPOINT, 213 .bEndpointAddress = USB_DIR_OUT, 214 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE 215 | USB_ENDPOINT_XFER_ISOC, 216 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE), 217 .bInterval = 4, 218 }; 219 220 /* Class-specific AS ISO OUT Endpoint Descriptor */ 221 static struct uac_iso_endpoint_descriptor as_iso_out_desc = { 222 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE, 223 .bDescriptorType = USB_DT_CS_ENDPOINT, 224 .bDescriptorSubtype = UAC_EP_GENERAL, 225 .bmAttributes = 1, 226 .bLockDelayUnits = 1, 227 .wLockDelay = cpu_to_le16(1), 228 }; 229 230 static struct uac_format_type_i_discrete_descriptor as_in_type_i_desc = { 231 .bLength = 0, /* filled on rate setup */ 232 .bDescriptorType = USB_DT_CS_INTERFACE, 233 .bDescriptorSubtype = UAC_FORMAT_TYPE, 234 .bFormatType = UAC_FORMAT_TYPE_I, 235 .bSubframeSize = 2, 236 .bBitResolution = 16, 237 .bSamFreqType = 0, /* filled on rate setup */ 238 }; 239 240 /* Standard ISO OUT Endpoint Descriptor */ 241 static struct usb_endpoint_descriptor as_in_ep_desc = { 242 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, 243 .bDescriptorType = USB_DT_ENDPOINT, 244 .bEndpointAddress = USB_DIR_IN, 245 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC 246 | USB_ENDPOINT_XFER_ISOC, 247 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE), 248 .bInterval = 4, 249 }; 250 251 /* Class-specific AS ISO OUT Endpoint Descriptor */ 252 static struct uac_iso_endpoint_descriptor as_iso_in_desc = { 253 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE, 254 .bDescriptorType = USB_DT_CS_ENDPOINT, 255 .bDescriptorSubtype = UAC_EP_GENERAL, 256 .bmAttributes = 1, 257 .bLockDelayUnits = 0, 258 .wLockDelay = 0, 259 }; 260 261 static struct usb_descriptor_header *f_audio_desc[] = { 262 (struct usb_descriptor_header *)&ac_interface_desc, 263 (struct usb_descriptor_header *)&ac_header_desc, 264 265 (struct usb_descriptor_header *)&usb_out_it_desc, 266 (struct usb_descriptor_header *)&io_out_ot_desc, 267 (struct usb_descriptor_header *)&out_feature_unit_desc, 268 269 (struct usb_descriptor_header *)&io_in_it_desc, 270 (struct usb_descriptor_header *)&usb_in_ot_desc, 271 (struct usb_descriptor_header *)&in_feature_unit_desc, 272 273 (struct usb_descriptor_header *)&ac_int_ep_desc, 274 275 (struct usb_descriptor_header *)&as_out_interface_alt_0_desc, 276 (struct usb_descriptor_header *)&as_out_interface_alt_1_desc, 277 (struct usb_descriptor_header *)&as_out_header_desc, 278 279 (struct usb_descriptor_header *)&as_out_type_i_desc, 280 281 (struct usb_descriptor_header *)&as_out_ep_desc, 282 (struct usb_descriptor_header *)&as_iso_out_desc, 283 284 (struct usb_descriptor_header *)&as_in_interface_alt_0_desc, 285 (struct usb_descriptor_header *)&as_in_interface_alt_1_desc, 286 (struct usb_descriptor_header *)&as_in_header_desc, 287 288 (struct usb_descriptor_header *)&as_in_type_i_desc, 289 290 (struct usb_descriptor_header *)&as_in_ep_desc, 291 (struct usb_descriptor_header *)&as_iso_in_desc, 292 NULL, 293 }; 294 295 enum { 296 STR_AC_IF, 297 STR_USB_OUT_IT, 298 STR_USB_OUT_IT_CH_NAMES, 299 STR_IO_OUT_OT, 300 STR_IO_IN_IT, 301 STR_IO_IN_IT_CH_NAMES, 302 STR_USB_IN_OT, 303 STR_FU_IN, 304 STR_FU_OUT, 305 STR_AS_OUT_IF_ALT0, 306 STR_AS_OUT_IF_ALT1, 307 STR_AS_IN_IF_ALT0, 308 STR_AS_IN_IF_ALT1, 309 }; 310 311 static struct usb_string strings_uac1[] = { 312 /* [STR_AC_IF].s = DYNAMIC, */ 313 [STR_USB_OUT_IT].s = "Playback Input terminal", 314 [STR_USB_OUT_IT_CH_NAMES].s = "Playback Channels", 315 [STR_IO_OUT_OT].s = "Playback Output terminal", 316 [STR_IO_IN_IT].s = "Capture Input terminal", 317 [STR_IO_IN_IT_CH_NAMES].s = "Capture Channels", 318 [STR_USB_IN_OT].s = "Capture Output terminal", 319 [STR_FU_IN].s = "Capture Volume", 320 [STR_FU_OUT].s = "Playback Volume", 321 [STR_AS_OUT_IF_ALT0].s = "Playback Inactive", 322 [STR_AS_OUT_IF_ALT1].s = "Playback Active", 323 [STR_AS_IN_IF_ALT0].s = "Capture Inactive", 324 [STR_AS_IN_IF_ALT1].s = "Capture Active", 325 { }, 326 }; 327 328 static struct usb_gadget_strings str_uac1 = { 329 .language = 0x0409, /* en-us */ 330 .strings = strings_uac1, 331 }; 332 333 static struct usb_gadget_strings *uac1_strings[] = { 334 &str_uac1, 335 NULL, 336 }; 337 338 /* 339 * This function is an ALSA sound card following USB Audio Class Spec 1.0. 340 */ 341 342 static void uac_cs_attr_sample_rate(struct usb_ep *ep, struct usb_request *req) 343 { 344 struct usb_function *fn = ep->driver_data; 345 struct usb_composite_dev *cdev = fn->config->cdev; 346 struct g_audio *agdev = func_to_g_audio(fn); 347 struct f_uac1 *uac1 = func_to_uac1(fn); 348 u8 *buf = (u8 *)req->buf; 349 u32 val = 0; 350 351 if (req->actual != 3) { 352 WARN(cdev, "Invalid data size for UAC_EP_CS_ATTR_SAMPLE_RATE.\n"); 353 return; 354 } 355 356 val = buf[0] | (buf[1] << 8) | (buf[2] << 16); 357 if (uac1->ctl_id == (USB_DIR_IN | 2)) { 358 uac1->p_srate = val; 359 u_audio_set_playback_srate(agdev, uac1->p_srate); 360 } else if (uac1->ctl_id == (USB_DIR_OUT | 1)) { 361 uac1->c_srate = val; 362 u_audio_set_capture_srate(agdev, uac1->c_srate); 363 } 364 } 365 366 static void audio_notify_complete(struct usb_ep *_ep, struct usb_request *req) 367 { 368 struct g_audio *audio = req->context; 369 struct f_uac1 *uac1 = func_to_uac1(&audio->func); 370 371 atomic_dec(&uac1->int_count); 372 kfree(req->buf); 373 usb_ep_free_request(_ep, req); 374 } 375 376 static int audio_notify(struct g_audio *audio, int unit_id, int cs) 377 { 378 struct f_uac1 *uac1 = func_to_uac1(&audio->func); 379 struct usb_request *req; 380 struct uac1_status_word *msg; 381 int ret; 382 383 if (!uac1->int_ep->enabled) 384 return 0; 385 386 if (atomic_inc_return(&uac1->int_count) > UAC1_DEF_INT_REQ_NUM) { 387 atomic_dec(&uac1->int_count); 388 return 0; 389 } 390 391 req = usb_ep_alloc_request(uac1->int_ep, GFP_ATOMIC); 392 if (req == NULL) { 393 ret = -ENOMEM; 394 goto err_dec_int_count; 395 } 396 397 msg = kmalloc(sizeof(*msg), GFP_ATOMIC); 398 if (msg == NULL) { 399 ret = -ENOMEM; 400 goto err_free_request; 401 } 402 403 msg->bStatusType = UAC1_STATUS_TYPE_IRQ_PENDING 404 | UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF; 405 msg->bOriginator = unit_id; 406 407 req->length = sizeof(*msg); 408 req->buf = msg; 409 req->context = audio; 410 req->complete = audio_notify_complete; 411 412 ret = usb_ep_queue(uac1->int_ep, req, GFP_ATOMIC); 413 414 if (ret) 415 goto err_free_msg; 416 417 return 0; 418 419 err_free_msg: 420 kfree(msg); 421 err_free_request: 422 usb_ep_free_request(uac1->int_ep, req); 423 err_dec_int_count: 424 atomic_dec(&uac1->int_count); 425 426 return ret; 427 } 428 429 static int 430 in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr) 431 { 432 struct usb_request *req = fn->config->cdev->req; 433 struct g_audio *audio = func_to_g_audio(fn); 434 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio); 435 u16 w_length = le16_to_cpu(cr->wLength); 436 u16 w_index = le16_to_cpu(cr->wIndex); 437 u16 w_value = le16_to_cpu(cr->wValue); 438 u8 entity_id = (w_index >> 8) & 0xff; 439 u8 control_selector = w_value >> 8; 440 int value = -EOPNOTSUPP; 441 442 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) || 443 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) { 444 unsigned int is_playback = 0; 445 446 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) 447 is_playback = 1; 448 449 if (control_selector == UAC_FU_MUTE) { 450 unsigned int mute; 451 452 u_audio_get_mute(audio, is_playback, &mute); 453 454 *(u8 *)req->buf = mute; 455 value = min_t(unsigned int, w_length, 1); 456 } else if (control_selector == UAC_FU_VOLUME) { 457 __le16 c; 458 s16 volume; 459 460 u_audio_get_volume(audio, is_playback, &volume); 461 462 c = cpu_to_le16(volume); 463 464 value = min_t(unsigned int, w_length, sizeof(c)); 465 memcpy(req->buf, &c, value); 466 } else { 467 dev_err(&audio->gadget->dev, 468 "%s:%d control_selector=%d TODO!\n", 469 __func__, __LINE__, control_selector); 470 } 471 } else { 472 dev_err(&audio->gadget->dev, 473 "%s:%d entity_id=%d control_selector=%d TODO!\n", 474 __func__, __LINE__, entity_id, control_selector); 475 } 476 477 return value; 478 } 479 480 static int 481 in_rq_min(struct usb_function *fn, const struct usb_ctrlrequest *cr) 482 { 483 struct usb_request *req = fn->config->cdev->req; 484 struct g_audio *audio = func_to_g_audio(fn); 485 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio); 486 u16 w_length = le16_to_cpu(cr->wLength); 487 u16 w_index = le16_to_cpu(cr->wIndex); 488 u16 w_value = le16_to_cpu(cr->wValue); 489 u8 entity_id = (w_index >> 8) & 0xff; 490 u8 control_selector = w_value >> 8; 491 int value = -EOPNOTSUPP; 492 493 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) || 494 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) { 495 unsigned int is_playback = 0; 496 497 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) 498 is_playback = 1; 499 500 if (control_selector == UAC_FU_VOLUME) { 501 __le16 r; 502 s16 min_db; 503 504 if (is_playback) 505 min_db = opts->p_volume_min; 506 else 507 min_db = opts->c_volume_min; 508 509 r = cpu_to_le16(min_db); 510 511 value = min_t(unsigned int, w_length, sizeof(r)); 512 memcpy(req->buf, &r, value); 513 } else { 514 dev_err(&audio->gadget->dev, 515 "%s:%d control_selector=%d TODO!\n", 516 __func__, __LINE__, control_selector); 517 } 518 } else { 519 dev_err(&audio->gadget->dev, 520 "%s:%d entity_id=%d control_selector=%d TODO!\n", 521 __func__, __LINE__, entity_id, control_selector); 522 } 523 524 return value; 525 } 526 527 static int 528 in_rq_max(struct usb_function *fn, const struct usb_ctrlrequest *cr) 529 { 530 struct usb_request *req = fn->config->cdev->req; 531 struct g_audio *audio = func_to_g_audio(fn); 532 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio); 533 u16 w_length = le16_to_cpu(cr->wLength); 534 u16 w_index = le16_to_cpu(cr->wIndex); 535 u16 w_value = le16_to_cpu(cr->wValue); 536 u8 entity_id = (w_index >> 8) & 0xff; 537 u8 control_selector = w_value >> 8; 538 int value = -EOPNOTSUPP; 539 540 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) || 541 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) { 542 unsigned int is_playback = 0; 543 544 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) 545 is_playback = 1; 546 547 if (control_selector == UAC_FU_VOLUME) { 548 __le16 r; 549 s16 max_db; 550 551 if (is_playback) 552 max_db = opts->p_volume_max; 553 else 554 max_db = opts->c_volume_max; 555 556 r = cpu_to_le16(max_db); 557 558 value = min_t(unsigned int, w_length, sizeof(r)); 559 memcpy(req->buf, &r, value); 560 } else { 561 dev_err(&audio->gadget->dev, 562 "%s:%d control_selector=%d TODO!\n", 563 __func__, __LINE__, control_selector); 564 } 565 } else { 566 dev_err(&audio->gadget->dev, 567 "%s:%d entity_id=%d control_selector=%d TODO!\n", 568 __func__, __LINE__, entity_id, control_selector); 569 } 570 571 return value; 572 } 573 574 static int 575 in_rq_res(struct usb_function *fn, const struct usb_ctrlrequest *cr) 576 { 577 struct usb_request *req = fn->config->cdev->req; 578 struct g_audio *audio = func_to_g_audio(fn); 579 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio); 580 u16 w_length = le16_to_cpu(cr->wLength); 581 u16 w_index = le16_to_cpu(cr->wIndex); 582 u16 w_value = le16_to_cpu(cr->wValue); 583 u8 entity_id = (w_index >> 8) & 0xff; 584 u8 control_selector = w_value >> 8; 585 int value = -EOPNOTSUPP; 586 587 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) || 588 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) { 589 unsigned int is_playback = 0; 590 591 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) 592 is_playback = 1; 593 594 if (control_selector == UAC_FU_VOLUME) { 595 __le16 r; 596 s16 res_db; 597 598 if (is_playback) 599 res_db = opts->p_volume_res; 600 else 601 res_db = opts->c_volume_res; 602 603 r = cpu_to_le16(res_db); 604 605 value = min_t(unsigned int, w_length, sizeof(r)); 606 memcpy(req->buf, &r, value); 607 } else { 608 dev_err(&audio->gadget->dev, 609 "%s:%d control_selector=%d TODO!\n", 610 __func__, __LINE__, control_selector); 611 } 612 } else { 613 dev_err(&audio->gadget->dev, 614 "%s:%d entity_id=%d control_selector=%d TODO!\n", 615 __func__, __LINE__, entity_id, control_selector); 616 } 617 618 return value; 619 } 620 621 static void 622 out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req) 623 { 624 struct g_audio *audio = req->context; 625 struct usb_composite_dev *cdev = audio->func.config->cdev; 626 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio); 627 struct f_uac1 *uac1 = func_to_uac1(&audio->func); 628 struct usb_ctrlrequest *cr = &uac1->setup_cr; 629 u16 w_index = le16_to_cpu(cr->wIndex); 630 u16 w_value = le16_to_cpu(cr->wValue); 631 u8 entity_id = (w_index >> 8) & 0xff; 632 u8 control_selector = w_value >> 8; 633 634 if (req->status != 0) { 635 dev_dbg(&cdev->gadget->dev, "completion err %d\n", req->status); 636 return; 637 } 638 639 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) || 640 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) { 641 unsigned int is_playback = 0; 642 643 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) 644 is_playback = 1; 645 646 if (control_selector == UAC_FU_MUTE) { 647 u8 mute = *(u8 *)req->buf; 648 649 u_audio_set_mute(audio, is_playback, mute); 650 651 return; 652 } else if (control_selector == UAC_FU_VOLUME) { 653 __le16 *c = req->buf; 654 s16 volume; 655 656 volume = le16_to_cpu(*c); 657 u_audio_set_volume(audio, is_playback, volume); 658 659 return; 660 } else { 661 dev_err(&audio->gadget->dev, 662 "%s:%d control_selector=%d TODO!\n", 663 __func__, __LINE__, control_selector); 664 usb_ep_set_halt(ep); 665 } 666 } else { 667 dev_err(&audio->gadget->dev, 668 "%s:%d entity_id=%d control_selector=%d TODO!\n", 669 __func__, __LINE__, entity_id, control_selector); 670 usb_ep_set_halt(ep); 671 672 } 673 } 674 675 static int 676 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr) 677 { 678 struct usb_request *req = fn->config->cdev->req; 679 struct g_audio *audio = func_to_g_audio(fn); 680 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio); 681 struct f_uac1 *uac1 = func_to_uac1(&audio->func); 682 u16 w_length = le16_to_cpu(cr->wLength); 683 u16 w_index = le16_to_cpu(cr->wIndex); 684 u16 w_value = le16_to_cpu(cr->wValue); 685 u8 entity_id = (w_index >> 8) & 0xff; 686 u8 control_selector = w_value >> 8; 687 688 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) || 689 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) { 690 memcpy(&uac1->setup_cr, cr, sizeof(*cr)); 691 req->context = audio; 692 req->complete = out_rq_cur_complete; 693 694 return w_length; 695 } else { 696 dev_err(&audio->gadget->dev, 697 "%s:%d entity_id=%d control_selector=%d TODO!\n", 698 __func__, __LINE__, entity_id, control_selector); 699 } 700 return -EOPNOTSUPP; 701 } 702 703 static int ac_rq_in(struct usb_function *f, 704 const struct usb_ctrlrequest *ctrl) 705 { 706 struct usb_composite_dev *cdev = f->config->cdev; 707 int value = -EOPNOTSUPP; 708 u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); 709 u16 len = le16_to_cpu(ctrl->wLength); 710 u16 w_value = le16_to_cpu(ctrl->wValue); 711 712 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n", 713 ctrl->bRequest, w_value, len, ep); 714 715 switch (ctrl->bRequest) { 716 case UAC_GET_CUR: 717 return in_rq_cur(f, ctrl); 718 case UAC_GET_MIN: 719 return in_rq_min(f, ctrl); 720 case UAC_GET_MAX: 721 return in_rq_max(f, ctrl); 722 case UAC_GET_RES: 723 return in_rq_res(f, ctrl); 724 case UAC_GET_MEM: 725 break; 726 case UAC_GET_STAT: 727 value = len; 728 break; 729 default: 730 break; 731 } 732 733 return value; 734 } 735 736 static int audio_set_endpoint_req(struct usb_function *f, 737 const struct usb_ctrlrequest *ctrl) 738 { 739 struct usb_composite_dev *cdev = f->config->cdev; 740 struct usb_request *req = f->config->cdev->req; 741 struct f_uac1 *uac1 = func_to_uac1(f); 742 int value = -EOPNOTSUPP; 743 u16 ep = le16_to_cpu(ctrl->wIndex); 744 u16 len = le16_to_cpu(ctrl->wLength); 745 u16 w_value = le16_to_cpu(ctrl->wValue); 746 u8 cs = w_value >> 8; 747 748 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n", 749 ctrl->bRequest, w_value, len, ep); 750 751 switch (ctrl->bRequest) { 752 case UAC_SET_CUR: { 753 if (cs == UAC_EP_CS_ATTR_SAMPLE_RATE) { 754 cdev->gadget->ep0->driver_data = f; 755 uac1->ctl_id = ep; 756 req->complete = uac_cs_attr_sample_rate; 757 } 758 value = len; 759 break; 760 } 761 762 case UAC_SET_MIN: 763 break; 764 765 case UAC_SET_MAX: 766 break; 767 768 case UAC_SET_RES: 769 break; 770 771 case UAC_SET_MEM: 772 break; 773 774 default: 775 break; 776 } 777 778 return value; 779 } 780 781 static int audio_get_endpoint_req(struct usb_function *f, 782 const struct usb_ctrlrequest *ctrl) 783 { 784 struct usb_composite_dev *cdev = f->config->cdev; 785 struct usb_request *req = f->config->cdev->req; 786 struct f_uac1 *uac1 = func_to_uac1(f); 787 u8 *buf = (u8 *)req->buf; 788 int value = -EOPNOTSUPP; 789 u8 ep = le16_to_cpu(ctrl->wIndex); 790 u16 len = le16_to_cpu(ctrl->wLength); 791 u16 w_value = le16_to_cpu(ctrl->wValue); 792 u8 cs = w_value >> 8; 793 u32 val = 0; 794 795 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n", 796 ctrl->bRequest, w_value, len, ep); 797 798 switch (ctrl->bRequest) { 799 case UAC_GET_CUR: { 800 if (cs == UAC_EP_CS_ATTR_SAMPLE_RATE) { 801 if (ep == (USB_DIR_IN | 2)) 802 val = uac1->p_srate; 803 else if (ep == (USB_DIR_OUT | 1)) 804 val = uac1->c_srate; 805 buf[2] = (val >> 16) & 0xff; 806 buf[1] = (val >> 8) & 0xff; 807 buf[0] = val & 0xff; 808 } 809 value = len; 810 break; 811 } 812 case UAC_GET_MIN: 813 case UAC_GET_MAX: 814 case UAC_GET_RES: 815 value = len; 816 break; 817 case UAC_GET_MEM: 818 break; 819 default: 820 break; 821 } 822 823 return value; 824 } 825 826 static int 827 f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) 828 { 829 struct usb_composite_dev *cdev = f->config->cdev; 830 struct usb_request *req = cdev->req; 831 int value = -EOPNOTSUPP; 832 u16 w_index = le16_to_cpu(ctrl->wIndex); 833 u16 w_value = le16_to_cpu(ctrl->wValue); 834 u16 w_length = le16_to_cpu(ctrl->wLength); 835 836 /* composite driver infrastructure handles everything; interface 837 * activation uses set_alt(). 838 */ 839 switch (ctrl->bRequestType) { 840 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: 841 value = audio_set_endpoint_req(f, ctrl); 842 break; 843 844 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: 845 value = audio_get_endpoint_req(f, ctrl); 846 break; 847 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE: 848 if (ctrl->bRequest == UAC_SET_CUR) 849 value = out_rq_cur(f, ctrl); 850 break; 851 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE: 852 value = ac_rq_in(f, ctrl); 853 break; 854 default: 855 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", 856 ctrl->bRequestType, ctrl->bRequest, 857 w_value, w_index, w_length); 858 } 859 860 /* respond with data transfer or status phase? */ 861 if (value >= 0) { 862 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n", 863 ctrl->bRequestType, ctrl->bRequest, 864 w_value, w_index, w_length); 865 req->zero = 0; 866 req->length = value; 867 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); 868 if (value < 0) 869 ERROR(cdev, "audio response on err %d\n", value); 870 } 871 872 /* device either stalls (value < 0) or reports success */ 873 return value; 874 } 875 876 static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 877 { 878 struct usb_composite_dev *cdev = f->config->cdev; 879 struct usb_gadget *gadget = cdev->gadget; 880 struct device *dev = &gadget->dev; 881 struct g_audio *audio = func_to_g_audio(f); 882 struct f_uac1 *uac1 = func_to_uac1(f); 883 int ret = 0; 884 885 /* No i/f has more than 2 alt settings */ 886 if (alt > 1) { 887 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 888 return -EINVAL; 889 } 890 891 if (intf == uac1->ac_intf) { 892 /* Control I/f has only 1 AltSetting - 0 */ 893 if (alt) { 894 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 895 return -EINVAL; 896 } 897 898 /* restart interrupt endpoint */ 899 if (uac1->int_ep) { 900 usb_ep_disable(uac1->int_ep); 901 config_ep_by_speed(gadget, &audio->func, uac1->int_ep); 902 usb_ep_enable(uac1->int_ep); 903 } 904 905 return 0; 906 } 907 908 if (intf == uac1->as_out_intf) { 909 uac1->as_out_alt = alt; 910 911 if (alt) 912 ret = u_audio_start_capture(&uac1->g_audio); 913 else 914 u_audio_stop_capture(&uac1->g_audio); 915 } else if (intf == uac1->as_in_intf) { 916 uac1->as_in_alt = alt; 917 918 if (alt) 919 ret = u_audio_start_playback(&uac1->g_audio); 920 else 921 u_audio_stop_playback(&uac1->g_audio); 922 } else { 923 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 924 return -EINVAL; 925 } 926 927 return ret; 928 } 929 930 static int f_audio_get_alt(struct usb_function *f, unsigned intf) 931 { 932 struct usb_composite_dev *cdev = f->config->cdev; 933 struct usb_gadget *gadget = cdev->gadget; 934 struct device *dev = &gadget->dev; 935 struct f_uac1 *uac1 = func_to_uac1(f); 936 937 if (intf == uac1->ac_intf) 938 return uac1->ac_alt; 939 else if (intf == uac1->as_out_intf) 940 return uac1->as_out_alt; 941 else if (intf == uac1->as_in_intf) 942 return uac1->as_in_alt; 943 else 944 dev_err(dev, "%s:%d Invalid Interface %d!\n", 945 __func__, __LINE__, intf); 946 947 return -EINVAL; 948 } 949 950 951 static void f_audio_disable(struct usb_function *f) 952 { 953 struct f_uac1 *uac1 = func_to_uac1(f); 954 955 uac1->as_out_alt = 0; 956 uac1->as_in_alt = 0; 957 958 u_audio_stop_playback(&uac1->g_audio); 959 u_audio_stop_capture(&uac1->g_audio); 960 if (uac1->int_ep) 961 usb_ep_disable(uac1->int_ep); 962 } 963 964 static void 965 f_audio_suspend(struct usb_function *f) 966 { 967 struct f_uac1 *uac1 = func_to_uac1(f); 968 969 u_audio_suspend(&uac1->g_audio); 970 } 971 972 /*-------------------------------------------------------------------------*/ 973 static struct uac_feature_unit_descriptor *build_fu_desc(int chmask) 974 { 975 struct uac_feature_unit_descriptor *fu_desc; 976 int channels = num_channels(chmask); 977 int fu_desc_size = UAC_DT_FEATURE_UNIT_SIZE(channels); 978 979 fu_desc = kzalloc(fu_desc_size, GFP_KERNEL); 980 if (!fu_desc) 981 return NULL; 982 983 fu_desc->bLength = fu_desc_size; 984 fu_desc->bDescriptorType = USB_DT_CS_INTERFACE; 985 986 fu_desc->bDescriptorSubtype = UAC_FEATURE_UNIT; 987 fu_desc->bControlSize = 2; 988 989 /* bUnitID, bSourceID and bmaControls will be defined later */ 990 991 return fu_desc; 992 } 993 994 /* B.3.2 Class-Specific AC Interface Descriptor */ 995 static struct 996 uac1_ac_header_descriptor *build_ac_header_desc(struct f_uac1_opts *opts) 997 { 998 struct uac1_ac_header_descriptor *ac_desc; 999 int ac_header_desc_size; 1000 int num_ifaces = 0; 1001 1002 if (EPOUT_EN(opts)) 1003 num_ifaces++; 1004 if (EPIN_EN(opts)) 1005 num_ifaces++; 1006 1007 ac_header_desc_size = UAC_DT_AC_HEADER_SIZE(num_ifaces); 1008 1009 ac_desc = kzalloc(ac_header_desc_size, GFP_KERNEL); 1010 if (!ac_desc) 1011 return NULL; 1012 1013 ac_desc->bLength = ac_header_desc_size; 1014 ac_desc->bDescriptorType = USB_DT_CS_INTERFACE; 1015 ac_desc->bDescriptorSubtype = UAC_HEADER; 1016 ac_desc->bcdADC = cpu_to_le16(0x0100); 1017 ac_desc->bInCollection = num_ifaces; 1018 1019 /* wTotalLength and baInterfaceNr will be defined later */ 1020 1021 return ac_desc; 1022 } 1023 1024 /* Use macro to overcome line length limitation */ 1025 #define USBDHDR(p) (struct usb_descriptor_header *)(p) 1026 1027 static void setup_descriptor(struct f_uac1_opts *opts) 1028 { 1029 /* patch descriptors */ 1030 int i = 1; /* ID's start with 1 */ 1031 1032 if (EPOUT_EN(opts)) 1033 usb_out_it_desc.bTerminalID = i++; 1034 if (EPIN_EN(opts)) 1035 io_in_it_desc.bTerminalID = i++; 1036 if (EPOUT_EN(opts)) 1037 io_out_ot_desc.bTerminalID = i++; 1038 if (EPIN_EN(opts)) 1039 usb_in_ot_desc.bTerminalID = i++; 1040 if (FUOUT_EN(opts)) 1041 out_feature_unit_desc->bUnitID = i++; 1042 if (FUIN_EN(opts)) 1043 in_feature_unit_desc->bUnitID = i++; 1044 1045 if (FUIN_EN(opts)) { 1046 usb_in_ot_desc.bSourceID = in_feature_unit_desc->bUnitID; 1047 in_feature_unit_desc->bSourceID = io_in_it_desc.bTerminalID; 1048 } else { 1049 usb_in_ot_desc.bSourceID = io_in_it_desc.bTerminalID; 1050 } 1051 if (FUOUT_EN(opts)) { 1052 io_out_ot_desc.bSourceID = out_feature_unit_desc->bUnitID; 1053 out_feature_unit_desc->bSourceID = usb_out_it_desc.bTerminalID; 1054 } else { 1055 io_out_ot_desc.bSourceID = usb_out_it_desc.bTerminalID; 1056 } 1057 1058 as_out_header_desc.bTerminalLink = usb_out_it_desc.bTerminalID; 1059 as_in_header_desc.bTerminalLink = usb_in_ot_desc.bTerminalID; 1060 1061 ac_header_desc->wTotalLength = cpu_to_le16(ac_header_desc->bLength); 1062 1063 if (EPIN_EN(opts)) { 1064 u16 len = le16_to_cpu(ac_header_desc->wTotalLength); 1065 1066 len += sizeof(usb_in_ot_desc); 1067 len += sizeof(io_in_it_desc); 1068 if (FUIN_EN(opts)) 1069 len += in_feature_unit_desc->bLength; 1070 ac_header_desc->wTotalLength = cpu_to_le16(len); 1071 } 1072 if (EPOUT_EN(opts)) { 1073 u16 len = le16_to_cpu(ac_header_desc->wTotalLength); 1074 1075 len += sizeof(usb_out_it_desc); 1076 len += sizeof(io_out_ot_desc); 1077 if (FUOUT_EN(opts)) 1078 len += out_feature_unit_desc->bLength; 1079 ac_header_desc->wTotalLength = cpu_to_le16(len); 1080 } 1081 1082 i = 0; 1083 f_audio_desc[i++] = USBDHDR(&ac_interface_desc); 1084 f_audio_desc[i++] = USBDHDR(ac_header_desc); 1085 1086 if (EPOUT_EN(opts)) { 1087 f_audio_desc[i++] = USBDHDR(&usb_out_it_desc); 1088 f_audio_desc[i++] = USBDHDR(&io_out_ot_desc); 1089 if (FUOUT_EN(opts)) 1090 f_audio_desc[i++] = USBDHDR(out_feature_unit_desc); 1091 } 1092 1093 if (EPIN_EN(opts)) { 1094 f_audio_desc[i++] = USBDHDR(&io_in_it_desc); 1095 f_audio_desc[i++] = USBDHDR(&usb_in_ot_desc); 1096 if (FUIN_EN(opts)) 1097 f_audio_desc[i++] = USBDHDR(in_feature_unit_desc); 1098 } 1099 1100 if (FUOUT_EN(opts) || FUIN_EN(opts)) 1101 f_audio_desc[i++] = USBDHDR(&ac_int_ep_desc); 1102 1103 if (EPOUT_EN(opts)) { 1104 f_audio_desc[i++] = USBDHDR(&as_out_interface_alt_0_desc); 1105 f_audio_desc[i++] = USBDHDR(&as_out_interface_alt_1_desc); 1106 f_audio_desc[i++] = USBDHDR(&as_out_header_desc); 1107 f_audio_desc[i++] = USBDHDR(&as_out_type_i_desc); 1108 f_audio_desc[i++] = USBDHDR(&as_out_ep_desc); 1109 f_audio_desc[i++] = USBDHDR(&as_iso_out_desc); 1110 } 1111 if (EPIN_EN(opts)) { 1112 f_audio_desc[i++] = USBDHDR(&as_in_interface_alt_0_desc); 1113 f_audio_desc[i++] = USBDHDR(&as_in_interface_alt_1_desc); 1114 f_audio_desc[i++] = USBDHDR(&as_in_header_desc); 1115 f_audio_desc[i++] = USBDHDR(&as_in_type_i_desc); 1116 f_audio_desc[i++] = USBDHDR(&as_in_ep_desc); 1117 f_audio_desc[i++] = USBDHDR(&as_iso_in_desc); 1118 } 1119 f_audio_desc[i] = NULL; 1120 } 1121 1122 static int f_audio_validate_opts(struct g_audio *audio, struct device *dev) 1123 { 1124 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio); 1125 1126 if (!opts->p_chmask && !opts->c_chmask) { 1127 dev_err(dev, "Error: no playback and capture channels\n"); 1128 return -EINVAL; 1129 } else if (opts->p_chmask & ~UAC1_CHANNEL_MASK) { 1130 dev_err(dev, "Error: unsupported playback channels mask\n"); 1131 return -EINVAL; 1132 } else if (opts->c_chmask & ~UAC1_CHANNEL_MASK) { 1133 dev_err(dev, "Error: unsupported capture channels mask\n"); 1134 return -EINVAL; 1135 } else if ((opts->p_ssize < 1) || (opts->p_ssize > 4)) { 1136 dev_err(dev, "Error: incorrect playback sample size\n"); 1137 return -EINVAL; 1138 } else if ((opts->c_ssize < 1) || (opts->c_ssize > 4)) { 1139 dev_err(dev, "Error: incorrect capture sample size\n"); 1140 return -EINVAL; 1141 } else if (!opts->p_srates[0]) { 1142 dev_err(dev, "Error: incorrect playback sampling rate\n"); 1143 return -EINVAL; 1144 } else if (!opts->c_srates[0]) { 1145 dev_err(dev, "Error: incorrect capture sampling rate\n"); 1146 return -EINVAL; 1147 } 1148 1149 if (opts->p_volume_max <= opts->p_volume_min) { 1150 dev_err(dev, "Error: incorrect playback volume max/min\n"); 1151 return -EINVAL; 1152 } else if (opts->c_volume_max <= opts->c_volume_min) { 1153 dev_err(dev, "Error: incorrect capture volume max/min\n"); 1154 return -EINVAL; 1155 } else if (opts->p_volume_res <= 0) { 1156 dev_err(dev, "Error: negative/zero playback volume resolution\n"); 1157 return -EINVAL; 1158 } else if (opts->c_volume_res <= 0) { 1159 dev_err(dev, "Error: negative/zero capture volume resolution\n"); 1160 return -EINVAL; 1161 } 1162 1163 if ((opts->p_volume_max - opts->p_volume_min) % opts->p_volume_res) { 1164 dev_err(dev, "Error: incorrect playback volume resolution\n"); 1165 return -EINVAL; 1166 } else if ((opts->c_volume_max - opts->c_volume_min) % opts->c_volume_res) { 1167 dev_err(dev, "Error: incorrect capture volume resolution\n"); 1168 return -EINVAL; 1169 } 1170 1171 return 0; 1172 } 1173 1174 /* audio function driver setup/binding */ 1175 static int f_audio_bind(struct usb_configuration *c, struct usb_function *f) 1176 { 1177 struct usb_composite_dev *cdev = c->cdev; 1178 struct usb_gadget *gadget = cdev->gadget; 1179 struct device *dev = &gadget->dev; 1180 struct f_uac1 *uac1 = func_to_uac1(f); 1181 struct g_audio *audio = func_to_g_audio(f); 1182 struct f_uac1_opts *audio_opts; 1183 struct usb_ep *ep = NULL; 1184 struct usb_string *us; 1185 int ba_iface_id; 1186 int status; 1187 int idx, i; 1188 1189 status = f_audio_validate_opts(audio, dev); 1190 if (status) 1191 return status; 1192 1193 audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst); 1194 1195 strings_uac1[STR_AC_IF].s = audio_opts->function_name; 1196 1197 us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1)); 1198 if (IS_ERR(us)) 1199 return PTR_ERR(us); 1200 1201 ac_header_desc = build_ac_header_desc(audio_opts); 1202 if (!ac_header_desc) 1203 return -ENOMEM; 1204 1205 if (FUOUT_EN(audio_opts)) { 1206 out_feature_unit_desc = build_fu_desc(audio_opts->c_chmask); 1207 if (!out_feature_unit_desc) { 1208 status = -ENOMEM; 1209 goto fail; 1210 } 1211 } 1212 if (FUIN_EN(audio_opts)) { 1213 in_feature_unit_desc = build_fu_desc(audio_opts->p_chmask); 1214 if (!in_feature_unit_desc) { 1215 status = -ENOMEM; 1216 goto err_free_fu; 1217 } 1218 } 1219 1220 ac_interface_desc.iInterface = us[STR_AC_IF].id; 1221 usb_out_it_desc.iTerminal = us[STR_USB_OUT_IT].id; 1222 usb_out_it_desc.iChannelNames = us[STR_USB_OUT_IT_CH_NAMES].id; 1223 io_out_ot_desc.iTerminal = us[STR_IO_OUT_OT].id; 1224 as_out_interface_alt_0_desc.iInterface = us[STR_AS_OUT_IF_ALT0].id; 1225 as_out_interface_alt_1_desc.iInterface = us[STR_AS_OUT_IF_ALT1].id; 1226 io_in_it_desc.iTerminal = us[STR_IO_IN_IT].id; 1227 io_in_it_desc.iChannelNames = us[STR_IO_IN_IT_CH_NAMES].id; 1228 usb_in_ot_desc.iTerminal = us[STR_USB_IN_OT].id; 1229 as_in_interface_alt_0_desc.iInterface = us[STR_AS_IN_IF_ALT0].id; 1230 as_in_interface_alt_1_desc.iInterface = us[STR_AS_IN_IF_ALT1].id; 1231 1232 if (FUOUT_EN(audio_opts)) { 1233 u8 *i_feature; 1234 1235 i_feature = (u8 *)out_feature_unit_desc + 1236 out_feature_unit_desc->bLength - 1; 1237 *i_feature = us[STR_FU_OUT].id; 1238 } 1239 if (FUIN_EN(audio_opts)) { 1240 u8 *i_feature; 1241 1242 i_feature = (u8 *)in_feature_unit_desc + 1243 in_feature_unit_desc->bLength - 1; 1244 *i_feature = us[STR_FU_IN].id; 1245 } 1246 1247 /* Set channel numbers */ 1248 usb_out_it_desc.bNrChannels = num_channels(audio_opts->c_chmask); 1249 usb_out_it_desc.wChannelConfig = cpu_to_le16(audio_opts->c_chmask); 1250 as_out_type_i_desc.bNrChannels = num_channels(audio_opts->c_chmask); 1251 as_out_type_i_desc.bSubframeSize = audio_opts->c_ssize; 1252 as_out_type_i_desc.bBitResolution = audio_opts->c_ssize * 8; 1253 io_in_it_desc.bNrChannels = num_channels(audio_opts->p_chmask); 1254 io_in_it_desc.wChannelConfig = cpu_to_le16(audio_opts->p_chmask); 1255 as_in_type_i_desc.bNrChannels = num_channels(audio_opts->p_chmask); 1256 as_in_type_i_desc.bSubframeSize = audio_opts->p_ssize; 1257 as_in_type_i_desc.bBitResolution = audio_opts->p_ssize * 8; 1258 1259 if (FUOUT_EN(audio_opts)) { 1260 __le16 *bma = (__le16 *)&out_feature_unit_desc->bmaControls[0]; 1261 u32 control = 0; 1262 1263 if (audio_opts->c_mute_present) 1264 control |= UAC_FU_MUTE; 1265 if (audio_opts->c_volume_present) 1266 control |= UAC_FU_VOLUME; 1267 *bma = cpu_to_le16(control); 1268 } 1269 if (FUIN_EN(audio_opts)) { 1270 __le16 *bma = (__le16 *)&in_feature_unit_desc->bmaControls[0]; 1271 u32 control = 0; 1272 1273 if (audio_opts->p_mute_present) 1274 control |= UAC_FU_MUTE; 1275 if (audio_opts->p_volume_present) 1276 control |= UAC_FU_VOLUME; 1277 *bma = cpu_to_le16(control); 1278 } 1279 1280 /* Set sample rates */ 1281 for (i = 0, idx = 0; i < UAC_MAX_RATES; i++) { 1282 if (audio_opts->c_srates[i] == 0) 1283 break; 1284 memcpy(as_out_type_i_desc.tSamFreq[idx++], 1285 &audio_opts->c_srates[i], 3); 1286 } 1287 as_out_type_i_desc.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(idx); 1288 as_out_type_i_desc.bSamFreqType = idx; 1289 1290 for (i = 0, idx = 0; i < UAC_MAX_RATES; i++) { 1291 if (audio_opts->p_srates[i] == 0) 1292 break; 1293 memcpy(as_in_type_i_desc.tSamFreq[idx++], 1294 &audio_opts->p_srates[i], 3); 1295 } 1296 as_in_type_i_desc.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(idx); 1297 as_in_type_i_desc.bSamFreqType = idx; 1298 uac1->p_srate = audio_opts->p_srates[0]; 1299 uac1->c_srate = audio_opts->c_srates[0]; 1300 1301 /* allocate instance-specific interface IDs, and patch descriptors */ 1302 status = usb_interface_id(c, f); 1303 if (status < 0) 1304 goto err_free_fu; 1305 ac_interface_desc.bInterfaceNumber = status; 1306 uac1->ac_intf = status; 1307 uac1->ac_alt = 0; 1308 1309 ba_iface_id = 0; 1310 1311 if (EPOUT_EN(audio_opts)) { 1312 status = usb_interface_id(c, f); 1313 if (status < 0) 1314 goto err_free_fu; 1315 as_out_interface_alt_0_desc.bInterfaceNumber = status; 1316 as_out_interface_alt_1_desc.bInterfaceNumber = status; 1317 ac_header_desc->baInterfaceNr[ba_iface_id++] = status; 1318 uac1->as_out_intf = status; 1319 uac1->as_out_alt = 0; 1320 } 1321 1322 if (EPIN_EN(audio_opts)) { 1323 status = usb_interface_id(c, f); 1324 if (status < 0) 1325 goto err_free_fu; 1326 as_in_interface_alt_0_desc.bInterfaceNumber = status; 1327 as_in_interface_alt_1_desc.bInterfaceNumber = status; 1328 ac_header_desc->baInterfaceNr[ba_iface_id++] = status; 1329 uac1->as_in_intf = status; 1330 uac1->as_in_alt = 0; 1331 } 1332 1333 audio->gadget = gadget; 1334 1335 status = -ENODEV; 1336 1337 ac_interface_desc.bNumEndpoints = 0; 1338 1339 /* allocate AC interrupt endpoint */ 1340 if (FUOUT_EN(audio_opts) || FUIN_EN(audio_opts)) { 1341 ep = usb_ep_autoconfig(cdev->gadget, &ac_int_ep_desc); 1342 if (!ep) 1343 goto err_free_fu; 1344 uac1->int_ep = ep; 1345 uac1->int_ep->desc = &ac_int_ep_desc; 1346 1347 ac_interface_desc.bNumEndpoints = 1; 1348 } 1349 1350 /* allocate instance-specific endpoints */ 1351 if (EPOUT_EN(audio_opts)) { 1352 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc); 1353 if (!ep) 1354 goto err_free_fu; 1355 audio->out_ep = ep; 1356 audio->out_ep->desc = &as_out_ep_desc; 1357 } 1358 1359 if (EPIN_EN(audio_opts)) { 1360 ep = usb_ep_autoconfig(cdev->gadget, &as_in_ep_desc); 1361 if (!ep) 1362 goto err_free_fu; 1363 audio->in_ep = ep; 1364 audio->in_ep->desc = &as_in_ep_desc; 1365 } 1366 1367 setup_descriptor(audio_opts); 1368 1369 /* copy descriptors, and track endpoint copies */ 1370 status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL, 1371 NULL); 1372 if (status) 1373 goto err_free_fu; 1374 1375 audio->out_ep_maxpsize = le16_to_cpu(as_out_ep_desc.wMaxPacketSize); 1376 audio->in_ep_maxpsize = le16_to_cpu(as_in_ep_desc.wMaxPacketSize); 1377 audio->params.c_chmask = audio_opts->c_chmask; 1378 memcpy(audio->params.c_srates, audio_opts->c_srates, 1379 sizeof(audio->params.c_srates)); 1380 audio->params.c_ssize = audio_opts->c_ssize; 1381 if (FUIN_EN(audio_opts)) { 1382 audio->params.p_fu.id = USB_IN_FU_ID; 1383 audio->params.p_fu.mute_present = audio_opts->p_mute_present; 1384 audio->params.p_fu.volume_present = 1385 audio_opts->p_volume_present; 1386 audio->params.p_fu.volume_min = audio_opts->p_volume_min; 1387 audio->params.p_fu.volume_max = audio_opts->p_volume_max; 1388 audio->params.p_fu.volume_res = audio_opts->p_volume_res; 1389 } 1390 audio->params.p_chmask = audio_opts->p_chmask; 1391 memcpy(audio->params.p_srates, audio_opts->p_srates, 1392 sizeof(audio->params.p_srates)); 1393 audio->params.p_ssize = audio_opts->p_ssize; 1394 if (FUOUT_EN(audio_opts)) { 1395 audio->params.c_fu.id = USB_OUT_FU_ID; 1396 audio->params.c_fu.mute_present = audio_opts->c_mute_present; 1397 audio->params.c_fu.volume_present = 1398 audio_opts->c_volume_present; 1399 audio->params.c_fu.volume_min = audio_opts->c_volume_min; 1400 audio->params.c_fu.volume_max = audio_opts->c_volume_max; 1401 audio->params.c_fu.volume_res = audio_opts->c_volume_res; 1402 } 1403 audio->params.req_number = audio_opts->req_number; 1404 audio->params.fb_max = FBACK_FAST_MAX; 1405 if (FUOUT_EN(audio_opts) || FUIN_EN(audio_opts)) 1406 audio->notify = audio_notify; 1407 1408 status = g_audio_setup(audio, "UAC1_PCM", "UAC1_Gadget"); 1409 if (status) 1410 goto err_card_register; 1411 1412 return 0; 1413 1414 err_card_register: 1415 usb_free_all_descriptors(f); 1416 err_free_fu: 1417 kfree(out_feature_unit_desc); 1418 out_feature_unit_desc = NULL; 1419 kfree(in_feature_unit_desc); 1420 in_feature_unit_desc = NULL; 1421 fail: 1422 kfree(ac_header_desc); 1423 ac_header_desc = NULL; 1424 return status; 1425 } 1426 1427 /*-------------------------------------------------------------------------*/ 1428 1429 static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item) 1430 { 1431 return container_of(to_config_group(item), struct f_uac1_opts, 1432 func_inst.group); 1433 } 1434 1435 static void f_uac1_attr_release(struct config_item *item) 1436 { 1437 struct f_uac1_opts *opts = to_f_uac1_opts(item); 1438 1439 usb_put_function_instance(&opts->func_inst); 1440 } 1441 1442 static struct configfs_item_operations f_uac1_item_ops = { 1443 .release = f_uac1_attr_release, 1444 }; 1445 1446 #define uac1_kstrtou32 kstrtou32 1447 #define uac1_kstrtos16 kstrtos16 1448 #define uac1_kstrtobool(s, base, res) kstrtobool((s), (res)) 1449 1450 static const char *u32_fmt = "%u\n"; 1451 static const char *s16_fmt = "%hd\n"; 1452 static const char *bool_fmt = "%u\n"; 1453 1454 #define UAC1_ATTRIBUTE(type, name) \ 1455 static ssize_t f_uac1_opts_##name##_show( \ 1456 struct config_item *item, \ 1457 char *page) \ 1458 { \ 1459 struct f_uac1_opts *opts = to_f_uac1_opts(item); \ 1460 int result; \ 1461 \ 1462 mutex_lock(&opts->lock); \ 1463 result = sprintf(page, type##_fmt, opts->name); \ 1464 mutex_unlock(&opts->lock); \ 1465 \ 1466 return result; \ 1467 } \ 1468 \ 1469 static ssize_t f_uac1_opts_##name##_store( \ 1470 struct config_item *item, \ 1471 const char *page, size_t len) \ 1472 { \ 1473 struct f_uac1_opts *opts = to_f_uac1_opts(item); \ 1474 int ret; \ 1475 type num; \ 1476 \ 1477 mutex_lock(&opts->lock); \ 1478 if (opts->refcnt) { \ 1479 ret = -EBUSY; \ 1480 goto end; \ 1481 } \ 1482 \ 1483 ret = uac1_kstrto##type(page, 0, &num); \ 1484 if (ret) \ 1485 goto end; \ 1486 \ 1487 opts->name = num; \ 1488 ret = len; \ 1489 \ 1490 end: \ 1491 mutex_unlock(&opts->lock); \ 1492 return ret; \ 1493 } \ 1494 \ 1495 CONFIGFS_ATTR(f_uac1_opts_, name) 1496 1497 #define UAC1_RATE_ATTRIBUTE(name) \ 1498 static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \ 1499 char *page) \ 1500 { \ 1501 struct f_uac1_opts *opts = to_f_uac1_opts(item); \ 1502 int result = 0; \ 1503 int i; \ 1504 \ 1505 mutex_lock(&opts->lock); \ 1506 page[0] = '\0'; \ 1507 for (i = 0; i < UAC_MAX_RATES; i++) { \ 1508 if (opts->name##s[i] == 0) \ 1509 break; \ 1510 result += sprintf(page + strlen(page), "%u,", \ 1511 opts->name##s[i]); \ 1512 } \ 1513 if (strlen(page) > 0) \ 1514 page[strlen(page) - 1] = '\n'; \ 1515 mutex_unlock(&opts->lock); \ 1516 \ 1517 return result; \ 1518 } \ 1519 \ 1520 static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \ 1521 const char *page, size_t len) \ 1522 { \ 1523 struct f_uac1_opts *opts = to_f_uac1_opts(item); \ 1524 char *split_page = NULL; \ 1525 int ret = -EINVAL; \ 1526 char *token; \ 1527 u32 num; \ 1528 int i; \ 1529 \ 1530 mutex_lock(&opts->lock); \ 1531 if (opts->refcnt) { \ 1532 ret = -EBUSY; \ 1533 goto end; \ 1534 } \ 1535 \ 1536 i = 0; \ 1537 memset(opts->name##s, 0x00, sizeof(opts->name##s)); \ 1538 split_page = kstrdup(page, GFP_KERNEL); \ 1539 while ((token = strsep(&split_page, ",")) != NULL) { \ 1540 ret = kstrtou32(token, 0, &num); \ 1541 if (ret) \ 1542 goto end; \ 1543 \ 1544 opts->name##s[i++] = num; \ 1545 ret = len; \ 1546 }; \ 1547 \ 1548 end: \ 1549 kfree(split_page); \ 1550 mutex_unlock(&opts->lock); \ 1551 return ret; \ 1552 } \ 1553 \ 1554 CONFIGFS_ATTR(f_uac1_opts_, name) 1555 1556 #define UAC1_ATTRIBUTE_STRING(name) \ 1557 static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \ 1558 char *page) \ 1559 { \ 1560 struct f_uac1_opts *opts = to_f_uac1_opts(item); \ 1561 int result; \ 1562 \ 1563 mutex_lock(&opts->lock); \ 1564 result = snprintf(page, sizeof(opts->name), "%s", opts->name); \ 1565 mutex_unlock(&opts->lock); \ 1566 \ 1567 return result; \ 1568 } \ 1569 \ 1570 static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \ 1571 const char *page, size_t len) \ 1572 { \ 1573 struct f_uac1_opts *opts = to_f_uac1_opts(item); \ 1574 int ret = 0; \ 1575 \ 1576 mutex_lock(&opts->lock); \ 1577 if (opts->refcnt) { \ 1578 ret = -EBUSY; \ 1579 goto end; \ 1580 } \ 1581 \ 1582 ret = snprintf(opts->name, min(sizeof(opts->name), len), \ 1583 "%s", page); \ 1584 \ 1585 end: \ 1586 mutex_unlock(&opts->lock); \ 1587 return ret; \ 1588 } \ 1589 \ 1590 CONFIGFS_ATTR(f_uac1_opts_, name) 1591 1592 UAC1_ATTRIBUTE(u32, c_chmask); 1593 UAC1_RATE_ATTRIBUTE(c_srate); 1594 UAC1_ATTRIBUTE(u32, c_ssize); 1595 UAC1_ATTRIBUTE(u32, p_chmask); 1596 UAC1_RATE_ATTRIBUTE(p_srate); 1597 UAC1_ATTRIBUTE(u32, p_ssize); 1598 UAC1_ATTRIBUTE(u32, req_number); 1599 1600 UAC1_ATTRIBUTE(bool, p_mute_present); 1601 UAC1_ATTRIBUTE(bool, p_volume_present); 1602 UAC1_ATTRIBUTE(s16, p_volume_min); 1603 UAC1_ATTRIBUTE(s16, p_volume_max); 1604 UAC1_ATTRIBUTE(s16, p_volume_res); 1605 1606 UAC1_ATTRIBUTE(bool, c_mute_present); 1607 UAC1_ATTRIBUTE(bool, c_volume_present); 1608 UAC1_ATTRIBUTE(s16, c_volume_min); 1609 UAC1_ATTRIBUTE(s16, c_volume_max); 1610 UAC1_ATTRIBUTE(s16, c_volume_res); 1611 UAC1_ATTRIBUTE_STRING(function_name); 1612 1613 static struct configfs_attribute *f_uac1_attrs[] = { 1614 &f_uac1_opts_attr_c_chmask, 1615 &f_uac1_opts_attr_c_srate, 1616 &f_uac1_opts_attr_c_ssize, 1617 &f_uac1_opts_attr_p_chmask, 1618 &f_uac1_opts_attr_p_srate, 1619 &f_uac1_opts_attr_p_ssize, 1620 &f_uac1_opts_attr_req_number, 1621 1622 &f_uac1_opts_attr_p_mute_present, 1623 &f_uac1_opts_attr_p_volume_present, 1624 &f_uac1_opts_attr_p_volume_min, 1625 &f_uac1_opts_attr_p_volume_max, 1626 &f_uac1_opts_attr_p_volume_res, 1627 1628 &f_uac1_opts_attr_c_mute_present, 1629 &f_uac1_opts_attr_c_volume_present, 1630 &f_uac1_opts_attr_c_volume_min, 1631 &f_uac1_opts_attr_c_volume_max, 1632 &f_uac1_opts_attr_c_volume_res, 1633 1634 &f_uac1_opts_attr_function_name, 1635 1636 NULL, 1637 }; 1638 1639 static const struct config_item_type f_uac1_func_type = { 1640 .ct_item_ops = &f_uac1_item_ops, 1641 .ct_attrs = f_uac1_attrs, 1642 .ct_owner = THIS_MODULE, 1643 }; 1644 1645 static void f_audio_free_inst(struct usb_function_instance *f) 1646 { 1647 struct f_uac1_opts *opts; 1648 1649 opts = container_of(f, struct f_uac1_opts, func_inst); 1650 kfree(opts); 1651 } 1652 1653 static struct usb_function_instance *f_audio_alloc_inst(void) 1654 { 1655 struct f_uac1_opts *opts; 1656 1657 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 1658 if (!opts) 1659 return ERR_PTR(-ENOMEM); 1660 1661 mutex_init(&opts->lock); 1662 opts->func_inst.free_func_inst = f_audio_free_inst; 1663 1664 config_group_init_type_name(&opts->func_inst.group, "", 1665 &f_uac1_func_type); 1666 1667 opts->c_chmask = UAC1_DEF_CCHMASK; 1668 opts->c_srates[0] = UAC1_DEF_CSRATE; 1669 opts->c_ssize = UAC1_DEF_CSSIZE; 1670 opts->p_chmask = UAC1_DEF_PCHMASK; 1671 opts->p_srates[0] = UAC1_DEF_PSRATE; 1672 opts->p_ssize = UAC1_DEF_PSSIZE; 1673 1674 opts->p_mute_present = UAC1_DEF_MUTE_PRESENT; 1675 opts->p_volume_present = UAC1_DEF_VOLUME_PRESENT; 1676 opts->p_volume_min = UAC1_DEF_MIN_DB; 1677 opts->p_volume_max = UAC1_DEF_MAX_DB; 1678 opts->p_volume_res = UAC1_DEF_RES_DB; 1679 1680 opts->c_mute_present = UAC1_DEF_MUTE_PRESENT; 1681 opts->c_volume_present = UAC1_DEF_VOLUME_PRESENT; 1682 opts->c_volume_min = UAC1_DEF_MIN_DB; 1683 opts->c_volume_max = UAC1_DEF_MAX_DB; 1684 opts->c_volume_res = UAC1_DEF_RES_DB; 1685 1686 opts->req_number = UAC1_DEF_REQ_NUM; 1687 1688 snprintf(opts->function_name, sizeof(opts->function_name), "AC Interface"); 1689 1690 return &opts->func_inst; 1691 } 1692 1693 static void f_audio_free(struct usb_function *f) 1694 { 1695 struct g_audio *audio; 1696 struct f_uac1_opts *opts; 1697 1698 audio = func_to_g_audio(f); 1699 opts = container_of(f->fi, struct f_uac1_opts, func_inst); 1700 kfree(audio); 1701 mutex_lock(&opts->lock); 1702 --opts->refcnt; 1703 mutex_unlock(&opts->lock); 1704 } 1705 1706 static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f) 1707 { 1708 struct g_audio *audio = func_to_g_audio(f); 1709 1710 g_audio_cleanup(audio); 1711 usb_free_all_descriptors(f); 1712 1713 kfree(out_feature_unit_desc); 1714 out_feature_unit_desc = NULL; 1715 kfree(in_feature_unit_desc); 1716 in_feature_unit_desc = NULL; 1717 1718 kfree(ac_header_desc); 1719 ac_header_desc = NULL; 1720 1721 audio->gadget = NULL; 1722 } 1723 1724 static struct usb_function *f_audio_alloc(struct usb_function_instance *fi) 1725 { 1726 struct f_uac1 *uac1; 1727 struct f_uac1_opts *opts; 1728 1729 /* allocate and initialize one new instance */ 1730 uac1 = kzalloc(sizeof(*uac1), GFP_KERNEL); 1731 if (!uac1) 1732 return ERR_PTR(-ENOMEM); 1733 1734 opts = container_of(fi, struct f_uac1_opts, func_inst); 1735 mutex_lock(&opts->lock); 1736 ++opts->refcnt; 1737 mutex_unlock(&opts->lock); 1738 1739 uac1->g_audio.func.name = "uac1_func"; 1740 uac1->g_audio.func.bind = f_audio_bind; 1741 uac1->g_audio.func.unbind = f_audio_unbind; 1742 uac1->g_audio.func.set_alt = f_audio_set_alt; 1743 uac1->g_audio.func.get_alt = f_audio_get_alt; 1744 uac1->g_audio.func.setup = f_audio_setup; 1745 uac1->g_audio.func.disable = f_audio_disable; 1746 uac1->g_audio.func.suspend = f_audio_suspend; 1747 uac1->g_audio.func.free_func = f_audio_free; 1748 1749 return &uac1->g_audio.func; 1750 } 1751 1752 DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc); 1753 MODULE_LICENSE("GPL"); 1754 MODULE_AUTHOR("Ruslan Bilovol"); 1755