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 * 7 * This driver doesn't expect any real Audio codec to be present 8 * on the device - the audio streams are simply sinked to and 9 * sourced from a virtual ALSA sound card created. 10 * 11 * This file is based on f_uac1.c which is 12 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org> 13 * Copyright (C) 2008 Analog Devices, Inc 14 */ 15 16#include <linux/usb/audio.h> 17#include <linux/module.h> 18 19#include "u_audio.h" 20#include "u_uac1.h" 21 22/* UAC1 spec: 3.7.2.3 Audio Channel Cluster Format */ 23#define UAC1_CHANNEL_MASK 0x0FFF 24 25struct f_uac1 { 26 struct g_audio g_audio; 27 u8 ac_intf, as_in_intf, as_out_intf; 28 u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */ 29}; 30 31static inline struct f_uac1 *func_to_uac1(struct usb_function *f) 32{ 33 return container_of(f, struct f_uac1, g_audio.func); 34} 35 36static inline struct f_uac1_opts *g_audio_to_uac1_opts(struct g_audio *audio) 37{ 38 return container_of(audio->func.fi, struct f_uac1_opts, func_inst); 39} 40 41/* 42 * DESCRIPTORS ... most are static, but strings and full 43 * configuration descriptors are built on demand. 44 */ 45 46/* 47 * We have three interfaces - one AudioControl and two AudioStreaming 48 * 49 * The driver implements a simple UAC_1 topology. 50 * USB-OUT -> IT_1 -> OT_2 -> ALSA_Capture 51 * ALSA_Playback -> IT_3 -> OT_4 -> USB-IN 52 */ 53#define F_AUDIO_AC_INTERFACE 0 54#define F_AUDIO_AS_OUT_INTERFACE 1 55#define F_AUDIO_AS_IN_INTERFACE 2 56/* Number of streaming interfaces */ 57#define F_AUDIO_NUM_INTERFACES 2 58 59/* B.3.1 Standard AC Interface Descriptor */ 60static struct usb_interface_descriptor ac_interface_desc = { 61 .bLength = USB_DT_INTERFACE_SIZE, 62 .bDescriptorType = USB_DT_INTERFACE, 63 .bNumEndpoints = 0, 64 .bInterfaceClass = USB_CLASS_AUDIO, 65 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, 66}; 67 68/* 69 * The number of AudioStreaming and MIDIStreaming interfaces 70 * in the Audio Interface Collection 71 */ 72DECLARE_UAC_AC_HEADER_DESCRIPTOR(2); 73 74#define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES) 75/* 2 input terminals and 2 output terminals */ 76#define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH \ 77 + 2*UAC_DT_INPUT_TERMINAL_SIZE + 2*UAC_DT_OUTPUT_TERMINAL_SIZE) 78/* B.3.2 Class-Specific AC Interface Descriptor */ 79static struct uac1_ac_header_descriptor_2 ac_header_desc = { 80 .bLength = UAC_DT_AC_HEADER_LENGTH, 81 .bDescriptorType = USB_DT_CS_INTERFACE, 82 .bDescriptorSubtype = UAC_HEADER, 83 .bcdADC = cpu_to_le16(0x0100), 84 .wTotalLength = cpu_to_le16(UAC_DT_TOTAL_LENGTH), 85 .bInCollection = F_AUDIO_NUM_INTERFACES, 86 .baInterfaceNr = { 87 /* Interface number of the AudioStream interfaces */ 88 [0] = 1, 89 [1] = 2, 90 } 91}; 92 93#define USB_OUT_IT_ID 1 94static struct uac_input_terminal_descriptor usb_out_it_desc = { 95 .bLength = UAC_DT_INPUT_TERMINAL_SIZE, 96 .bDescriptorType = USB_DT_CS_INTERFACE, 97 .bDescriptorSubtype = UAC_INPUT_TERMINAL, 98 .bTerminalID = USB_OUT_IT_ID, 99 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING), 100 .bAssocTerminal = 0, 101 .wChannelConfig = cpu_to_le16(0x3), 102}; 103 104#define IO_OUT_OT_ID 2 105static struct uac1_output_terminal_descriptor io_out_ot_desc = { 106 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE, 107 .bDescriptorType = USB_DT_CS_INTERFACE, 108 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, 109 .bTerminalID = IO_OUT_OT_ID, 110 .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_SPEAKER), 111 .bAssocTerminal = 0, 112 .bSourceID = USB_OUT_IT_ID, 113}; 114 115#define IO_IN_IT_ID 3 116static struct uac_input_terminal_descriptor io_in_it_desc = { 117 .bLength = UAC_DT_INPUT_TERMINAL_SIZE, 118 .bDescriptorType = USB_DT_CS_INTERFACE, 119 .bDescriptorSubtype = UAC_INPUT_TERMINAL, 120 .bTerminalID = IO_IN_IT_ID, 121 .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_MICROPHONE), 122 .bAssocTerminal = 0, 123 .wChannelConfig = cpu_to_le16(0x3), 124}; 125 126#define USB_IN_OT_ID 4 127static struct uac1_output_terminal_descriptor usb_in_ot_desc = { 128 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE, 129 .bDescriptorType = USB_DT_CS_INTERFACE, 130 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, 131 .bTerminalID = USB_IN_OT_ID, 132 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING), 133 .bAssocTerminal = 0, 134 .bSourceID = IO_IN_IT_ID, 135}; 136 137/* B.4.1 Standard AS Interface Descriptor */ 138static struct usb_interface_descriptor as_out_interface_alt_0_desc = { 139 .bLength = USB_DT_INTERFACE_SIZE, 140 .bDescriptorType = USB_DT_INTERFACE, 141 .bAlternateSetting = 0, 142 .bNumEndpoints = 0, 143 .bInterfaceClass = USB_CLASS_AUDIO, 144 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 145}; 146 147static struct usb_interface_descriptor as_out_interface_alt_1_desc = { 148 .bLength = USB_DT_INTERFACE_SIZE, 149 .bDescriptorType = USB_DT_INTERFACE, 150 .bAlternateSetting = 1, 151 .bNumEndpoints = 1, 152 .bInterfaceClass = USB_CLASS_AUDIO, 153 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 154}; 155 156static struct usb_interface_descriptor as_in_interface_alt_0_desc = { 157 .bLength = USB_DT_INTERFACE_SIZE, 158 .bDescriptorType = USB_DT_INTERFACE, 159 .bAlternateSetting = 0, 160 .bNumEndpoints = 0, 161 .bInterfaceClass = USB_CLASS_AUDIO, 162 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 163}; 164 165static struct usb_interface_descriptor as_in_interface_alt_1_desc = { 166 .bLength = USB_DT_INTERFACE_SIZE, 167 .bDescriptorType = USB_DT_INTERFACE, 168 .bAlternateSetting = 1, 169 .bNumEndpoints = 1, 170 .bInterfaceClass = USB_CLASS_AUDIO, 171 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 172}; 173 174/* B.4.2 Class-Specific AS Interface Descriptor */ 175static struct uac1_as_header_descriptor as_out_header_desc = { 176 .bLength = UAC_DT_AS_HEADER_SIZE, 177 .bDescriptorType = USB_DT_CS_INTERFACE, 178 .bDescriptorSubtype = UAC_AS_GENERAL, 179 .bTerminalLink = USB_OUT_IT_ID, 180 .bDelay = 1, 181 .wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM), 182}; 183 184static struct uac1_as_header_descriptor as_in_header_desc = { 185 .bLength = UAC_DT_AS_HEADER_SIZE, 186 .bDescriptorType = USB_DT_CS_INTERFACE, 187 .bDescriptorSubtype = UAC_AS_GENERAL, 188 .bTerminalLink = USB_IN_OT_ID, 189 .bDelay = 1, 190 .wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM), 191}; 192 193DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1); 194 195static struct uac_format_type_i_discrete_descriptor_1 as_out_type_i_desc = { 196 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1), 197 .bDescriptorType = USB_DT_CS_INTERFACE, 198 .bDescriptorSubtype = UAC_FORMAT_TYPE, 199 .bFormatType = UAC_FORMAT_TYPE_I, 200 .bSubframeSize = 2, 201 .bBitResolution = 16, 202 .bSamFreqType = 1, 203}; 204 205/* Standard ISO OUT Endpoint Descriptor */ 206static struct usb_endpoint_descriptor as_out_ep_desc = { 207 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, 208 .bDescriptorType = USB_DT_ENDPOINT, 209 .bEndpointAddress = USB_DIR_OUT, 210 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE 211 | USB_ENDPOINT_XFER_ISOC, 212 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE), 213 .bInterval = 4, 214}; 215 216/* Class-specific AS ISO OUT Endpoint Descriptor */ 217static struct uac_iso_endpoint_descriptor as_iso_out_desc = { 218 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE, 219 .bDescriptorType = USB_DT_CS_ENDPOINT, 220 .bDescriptorSubtype = UAC_EP_GENERAL, 221 .bmAttributes = 1, 222 .bLockDelayUnits = 1, 223 .wLockDelay = cpu_to_le16(1), 224}; 225 226static struct uac_format_type_i_discrete_descriptor_1 as_in_type_i_desc = { 227 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1), 228 .bDescriptorType = USB_DT_CS_INTERFACE, 229 .bDescriptorSubtype = UAC_FORMAT_TYPE, 230 .bFormatType = UAC_FORMAT_TYPE_I, 231 .bSubframeSize = 2, 232 .bBitResolution = 16, 233 .bSamFreqType = 1, 234}; 235 236/* Standard ISO OUT Endpoint Descriptor */ 237static struct usb_endpoint_descriptor as_in_ep_desc = { 238 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, 239 .bDescriptorType = USB_DT_ENDPOINT, 240 .bEndpointAddress = USB_DIR_IN, 241 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC 242 | USB_ENDPOINT_XFER_ISOC, 243 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE), 244 .bInterval = 4, 245}; 246 247/* Class-specific AS ISO OUT Endpoint Descriptor */ 248static struct uac_iso_endpoint_descriptor as_iso_in_desc = { 249 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE, 250 .bDescriptorType = USB_DT_CS_ENDPOINT, 251 .bDescriptorSubtype = UAC_EP_GENERAL, 252 .bmAttributes = 1, 253 .bLockDelayUnits = 0, 254 .wLockDelay = 0, 255}; 256 257static struct usb_descriptor_header *f_audio_desc[] = { 258 (struct usb_descriptor_header *)&ac_interface_desc, 259 (struct usb_descriptor_header *)&ac_header_desc, 260 261 (struct usb_descriptor_header *)&usb_out_it_desc, 262 (struct usb_descriptor_header *)&io_out_ot_desc, 263 (struct usb_descriptor_header *)&io_in_it_desc, 264 (struct usb_descriptor_header *)&usb_in_ot_desc, 265 266 (struct usb_descriptor_header *)&as_out_interface_alt_0_desc, 267 (struct usb_descriptor_header *)&as_out_interface_alt_1_desc, 268 (struct usb_descriptor_header *)&as_out_header_desc, 269 270 (struct usb_descriptor_header *)&as_out_type_i_desc, 271 272 (struct usb_descriptor_header *)&as_out_ep_desc, 273 (struct usb_descriptor_header *)&as_iso_out_desc, 274 275 (struct usb_descriptor_header *)&as_in_interface_alt_0_desc, 276 (struct usb_descriptor_header *)&as_in_interface_alt_1_desc, 277 (struct usb_descriptor_header *)&as_in_header_desc, 278 279 (struct usb_descriptor_header *)&as_in_type_i_desc, 280 281 (struct usb_descriptor_header *)&as_in_ep_desc, 282 (struct usb_descriptor_header *)&as_iso_in_desc, 283 NULL, 284}; 285 286enum { 287 STR_AC_IF, 288 STR_USB_OUT_IT, 289 STR_USB_OUT_IT_CH_NAMES, 290 STR_IO_OUT_OT, 291 STR_IO_IN_IT, 292 STR_IO_IN_IT_CH_NAMES, 293 STR_USB_IN_OT, 294 STR_AS_OUT_IF_ALT0, 295 STR_AS_OUT_IF_ALT1, 296 STR_AS_IN_IF_ALT0, 297 STR_AS_IN_IF_ALT1, 298}; 299 300static struct usb_string strings_uac1[] = { 301 [STR_AC_IF].s = "AC Interface", 302 [STR_USB_OUT_IT].s = "Playback Input terminal", 303 [STR_USB_OUT_IT_CH_NAMES].s = "Playback Channels", 304 [STR_IO_OUT_OT].s = "Playback Output terminal", 305 [STR_IO_IN_IT].s = "Capture Input terminal", 306 [STR_IO_IN_IT_CH_NAMES].s = "Capture Channels", 307 [STR_USB_IN_OT].s = "Capture Output terminal", 308 [STR_AS_OUT_IF_ALT0].s = "Playback Inactive", 309 [STR_AS_OUT_IF_ALT1].s = "Playback Active", 310 [STR_AS_IN_IF_ALT0].s = "Capture Inactive", 311 [STR_AS_IN_IF_ALT1].s = "Capture Active", 312 { }, 313}; 314 315static struct usb_gadget_strings str_uac1 = { 316 .language = 0x0409, /* en-us */ 317 .strings = strings_uac1, 318}; 319 320static struct usb_gadget_strings *uac1_strings[] = { 321 &str_uac1, 322 NULL, 323}; 324 325/* 326 * This function is an ALSA sound card following USB Audio Class Spec 1.0. 327 */ 328 329static int audio_set_endpoint_req(struct usb_function *f, 330 const struct usb_ctrlrequest *ctrl) 331{ 332 struct usb_composite_dev *cdev = f->config->cdev; 333 int value = -EOPNOTSUPP; 334 u16 ep = le16_to_cpu(ctrl->wIndex); 335 u16 len = le16_to_cpu(ctrl->wLength); 336 u16 w_value = le16_to_cpu(ctrl->wValue); 337 338 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n", 339 ctrl->bRequest, w_value, len, ep); 340 341 switch (ctrl->bRequest) { 342 case UAC_SET_CUR: 343 value = len; 344 break; 345 346 case UAC_SET_MIN: 347 break; 348 349 case UAC_SET_MAX: 350 break; 351 352 case UAC_SET_RES: 353 break; 354 355 case UAC_SET_MEM: 356 break; 357 358 default: 359 break; 360 } 361 362 return value; 363} 364 365static int audio_get_endpoint_req(struct usb_function *f, 366 const struct usb_ctrlrequest *ctrl) 367{ 368 struct usb_composite_dev *cdev = f->config->cdev; 369 int value = -EOPNOTSUPP; 370 u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); 371 u16 len = le16_to_cpu(ctrl->wLength); 372 u16 w_value = le16_to_cpu(ctrl->wValue); 373 374 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n", 375 ctrl->bRequest, w_value, len, ep); 376 377 switch (ctrl->bRequest) { 378 case UAC_GET_CUR: 379 case UAC_GET_MIN: 380 case UAC_GET_MAX: 381 case UAC_GET_RES: 382 value = len; 383 break; 384 case UAC_GET_MEM: 385 break; 386 default: 387 break; 388 } 389 390 return value; 391} 392 393static int 394f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) 395{ 396 struct usb_composite_dev *cdev = f->config->cdev; 397 struct usb_request *req = cdev->req; 398 int value = -EOPNOTSUPP; 399 u16 w_index = le16_to_cpu(ctrl->wIndex); 400 u16 w_value = le16_to_cpu(ctrl->wValue); 401 u16 w_length = le16_to_cpu(ctrl->wLength); 402 403 /* composite driver infrastructure handles everything; interface 404 * activation uses set_alt(). 405 */ 406 switch (ctrl->bRequestType) { 407 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: 408 value = audio_set_endpoint_req(f, ctrl); 409 break; 410 411 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: 412 value = audio_get_endpoint_req(f, ctrl); 413 break; 414 415 default: 416 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", 417 ctrl->bRequestType, ctrl->bRequest, 418 w_value, w_index, w_length); 419 } 420 421 /* respond with data transfer or status phase? */ 422 if (value >= 0) { 423 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n", 424 ctrl->bRequestType, ctrl->bRequest, 425 w_value, w_index, w_length); 426 req->zero = 0; 427 req->length = value; 428 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); 429 if (value < 0) 430 ERROR(cdev, "audio response on err %d\n", value); 431 } 432 433 /* device either stalls (value < 0) or reports success */ 434 return value; 435} 436 437static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 438{ 439 struct usb_composite_dev *cdev = f->config->cdev; 440 struct usb_gadget *gadget = cdev->gadget; 441 struct device *dev = &gadget->dev; 442 struct f_uac1 *uac1 = func_to_uac1(f); 443 int ret = 0; 444 445 /* No i/f has more than 2 alt settings */ 446 if (alt > 1) { 447 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 448 return -EINVAL; 449 } 450 451 if (intf == uac1->ac_intf) { 452 /* Control I/f has only 1 AltSetting - 0 */ 453 if (alt) { 454 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 455 return -EINVAL; 456 } 457 return 0; 458 } 459 460 if (intf == uac1->as_out_intf) { 461 uac1->as_out_alt = alt; 462 463 if (alt) 464 ret = u_audio_start_capture(&uac1->g_audio); 465 else 466 u_audio_stop_capture(&uac1->g_audio); 467 } else if (intf == uac1->as_in_intf) { 468 uac1->as_in_alt = alt; 469 470 if (alt) 471 ret = u_audio_start_playback(&uac1->g_audio); 472 else 473 u_audio_stop_playback(&uac1->g_audio); 474 } else { 475 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 476 return -EINVAL; 477 } 478 479 return ret; 480} 481 482static int f_audio_get_alt(struct usb_function *f, unsigned intf) 483{ 484 struct usb_composite_dev *cdev = f->config->cdev; 485 struct usb_gadget *gadget = cdev->gadget; 486 struct device *dev = &gadget->dev; 487 struct f_uac1 *uac1 = func_to_uac1(f); 488 489 if (intf == uac1->ac_intf) 490 return uac1->ac_alt; 491 else if (intf == uac1->as_out_intf) 492 return uac1->as_out_alt; 493 else if (intf == uac1->as_in_intf) 494 return uac1->as_in_alt; 495 else 496 dev_err(dev, "%s:%d Invalid Interface %d!\n", 497 __func__, __LINE__, intf); 498 499 return -EINVAL; 500} 501 502 503static void f_audio_disable(struct usb_function *f) 504{ 505 struct f_uac1 *uac1 = func_to_uac1(f); 506 507 uac1->as_out_alt = 0; 508 uac1->as_in_alt = 0; 509 510 u_audio_stop_playback(&uac1->g_audio); 511 u_audio_stop_capture(&uac1->g_audio); 512} 513 514/*-------------------------------------------------------------------------*/ 515 516static int f_audio_validate_opts(struct g_audio *audio, struct device *dev) 517{ 518 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio); 519 520 if (!opts->p_chmask && !opts->c_chmask) { 521 dev_err(dev, "Error: no playback and capture channels\n"); 522 return -EINVAL; 523 } else if (opts->p_chmask & ~UAC1_CHANNEL_MASK) { 524 dev_err(dev, "Error: unsupported playback channels mask\n"); 525 return -EINVAL; 526 } else if (opts->c_chmask & ~UAC1_CHANNEL_MASK) { 527 dev_err(dev, "Error: unsupported capture channels mask\n"); 528 return -EINVAL; 529 } else if ((opts->p_ssize < 1) || (opts->p_ssize > 4)) { 530 dev_err(dev, "Error: incorrect playback sample size\n"); 531 return -EINVAL; 532 } else if ((opts->c_ssize < 1) || (opts->c_ssize > 4)) { 533 dev_err(dev, "Error: incorrect capture sample size\n"); 534 return -EINVAL; 535 } else if (!opts->p_srate) { 536 dev_err(dev, "Error: incorrect playback sampling rate\n"); 537 return -EINVAL; 538 } else if (!opts->c_srate) { 539 dev_err(dev, "Error: incorrect capture sampling rate\n"); 540 return -EINVAL; 541 } 542 543 return 0; 544} 545 546/* audio function driver setup/binding */ 547static int f_audio_bind(struct usb_configuration *c, struct usb_function *f) 548{ 549 struct usb_composite_dev *cdev = c->cdev; 550 struct usb_gadget *gadget = cdev->gadget; 551 struct device *dev = &gadget->dev; 552 struct f_uac1 *uac1 = func_to_uac1(f); 553 struct g_audio *audio = func_to_g_audio(f); 554 struct f_uac1_opts *audio_opts; 555 struct usb_ep *ep = NULL; 556 struct usb_string *us; 557 u8 *sam_freq; 558 int rate; 559 int status; 560 561 status = f_audio_validate_opts(audio, dev); 562 if (status) 563 return status; 564 565 audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst); 566 567 us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1)); 568 if (IS_ERR(us)) 569 return PTR_ERR(us); 570 ac_interface_desc.iInterface = us[STR_AC_IF].id; 571 usb_out_it_desc.iTerminal = us[STR_USB_OUT_IT].id; 572 usb_out_it_desc.iChannelNames = us[STR_USB_OUT_IT_CH_NAMES].id; 573 io_out_ot_desc.iTerminal = us[STR_IO_OUT_OT].id; 574 as_out_interface_alt_0_desc.iInterface = us[STR_AS_OUT_IF_ALT0].id; 575 as_out_interface_alt_1_desc.iInterface = us[STR_AS_OUT_IF_ALT1].id; 576 io_in_it_desc.iTerminal = us[STR_IO_IN_IT].id; 577 io_in_it_desc.iChannelNames = us[STR_IO_IN_IT_CH_NAMES].id; 578 usb_in_ot_desc.iTerminal = us[STR_USB_IN_OT].id; 579 as_in_interface_alt_0_desc.iInterface = us[STR_AS_IN_IF_ALT0].id; 580 as_in_interface_alt_1_desc.iInterface = us[STR_AS_IN_IF_ALT1].id; 581 582 /* Set channel numbers */ 583 usb_out_it_desc.bNrChannels = num_channels(audio_opts->c_chmask); 584 usb_out_it_desc.wChannelConfig = cpu_to_le16(audio_opts->c_chmask); 585 as_out_type_i_desc.bNrChannels = num_channels(audio_opts->c_chmask); 586 as_out_type_i_desc.bSubframeSize = audio_opts->c_ssize; 587 as_out_type_i_desc.bBitResolution = audio_opts->c_ssize * 8; 588 io_in_it_desc.bNrChannels = num_channels(audio_opts->p_chmask); 589 io_in_it_desc.wChannelConfig = cpu_to_le16(audio_opts->p_chmask); 590 as_in_type_i_desc.bNrChannels = num_channels(audio_opts->p_chmask); 591 as_in_type_i_desc.bSubframeSize = audio_opts->p_ssize; 592 as_in_type_i_desc.bBitResolution = audio_opts->p_ssize * 8; 593 594 /* Set sample rates */ 595 rate = audio_opts->c_srate; 596 sam_freq = as_out_type_i_desc.tSamFreq[0]; 597 memcpy(sam_freq, &rate, 3); 598 rate = audio_opts->p_srate; 599 sam_freq = as_in_type_i_desc.tSamFreq[0]; 600 memcpy(sam_freq, &rate, 3); 601 602 /* allocate instance-specific interface IDs, and patch descriptors */ 603 status = usb_interface_id(c, f); 604 if (status < 0) 605 goto fail; 606 ac_interface_desc.bInterfaceNumber = status; 607 uac1->ac_intf = status; 608 uac1->ac_alt = 0; 609 610 status = usb_interface_id(c, f); 611 if (status < 0) 612 goto fail; 613 as_out_interface_alt_0_desc.bInterfaceNumber = status; 614 as_out_interface_alt_1_desc.bInterfaceNumber = status; 615 ac_header_desc.baInterfaceNr[0] = status; 616 uac1->as_out_intf = status; 617 uac1->as_out_alt = 0; 618 619 status = usb_interface_id(c, f); 620 if (status < 0) 621 goto fail; 622 as_in_interface_alt_0_desc.bInterfaceNumber = status; 623 as_in_interface_alt_1_desc.bInterfaceNumber = status; 624 ac_header_desc.baInterfaceNr[1] = status; 625 uac1->as_in_intf = status; 626 uac1->as_in_alt = 0; 627 628 audio->gadget = gadget; 629 630 status = -ENODEV; 631 632 /* allocate instance-specific endpoints */ 633 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc); 634 if (!ep) 635 goto fail; 636 audio->out_ep = ep; 637 audio->out_ep->desc = &as_out_ep_desc; 638 639 ep = usb_ep_autoconfig(cdev->gadget, &as_in_ep_desc); 640 if (!ep) 641 goto fail; 642 audio->in_ep = ep; 643 audio->in_ep->desc = &as_in_ep_desc; 644 645 /* copy descriptors, and track endpoint copies */ 646 status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL, 647 NULL); 648 if (status) 649 goto fail; 650 651 audio->out_ep_maxpsize = le16_to_cpu(as_out_ep_desc.wMaxPacketSize); 652 audio->in_ep_maxpsize = le16_to_cpu(as_in_ep_desc.wMaxPacketSize); 653 audio->params.c_chmask = audio_opts->c_chmask; 654 audio->params.c_srate = audio_opts->c_srate; 655 audio->params.c_ssize = audio_opts->c_ssize; 656 audio->params.p_chmask = audio_opts->p_chmask; 657 audio->params.p_srate = audio_opts->p_srate; 658 audio->params.p_ssize = audio_opts->p_ssize; 659 audio->params.req_number = audio_opts->req_number; 660 661 status = g_audio_setup(audio, "UAC1_PCM", "UAC1_Gadget"); 662 if (status) 663 goto err_card_register; 664 665 return 0; 666 667err_card_register: 668 usb_free_all_descriptors(f); 669fail: 670 return status; 671} 672 673/*-------------------------------------------------------------------------*/ 674 675static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item) 676{ 677 return container_of(to_config_group(item), struct f_uac1_opts, 678 func_inst.group); 679} 680 681static void f_uac1_attr_release(struct config_item *item) 682{ 683 struct f_uac1_opts *opts = to_f_uac1_opts(item); 684 685 usb_put_function_instance(&opts->func_inst); 686} 687 688static struct configfs_item_operations f_uac1_item_ops = { 689 .release = f_uac1_attr_release, 690}; 691 692#define UAC1_ATTRIBUTE(name) \ 693static ssize_t f_uac1_opts_##name##_show( \ 694 struct config_item *item, \ 695 char *page) \ 696{ \ 697 struct f_uac1_opts *opts = to_f_uac1_opts(item); \ 698 int result; \ 699 \ 700 mutex_lock(&opts->lock); \ 701 result = sprintf(page, "%u\n", opts->name); \ 702 mutex_unlock(&opts->lock); \ 703 \ 704 return result; \ 705} \ 706 \ 707static ssize_t f_uac1_opts_##name##_store( \ 708 struct config_item *item, \ 709 const char *page, size_t len) \ 710{ \ 711 struct f_uac1_opts *opts = to_f_uac1_opts(item); \ 712 int ret; \ 713 u32 num; \ 714 \ 715 mutex_lock(&opts->lock); \ 716 if (opts->refcnt) { \ 717 ret = -EBUSY; \ 718 goto end; \ 719 } \ 720 \ 721 ret = kstrtou32(page, 0, &num); \ 722 if (ret) \ 723 goto end; \ 724 \ 725 opts->name = num; \ 726 ret = len; \ 727 \ 728end: \ 729 mutex_unlock(&opts->lock); \ 730 return ret; \ 731} \ 732 \ 733CONFIGFS_ATTR(f_uac1_opts_, name) 734 735UAC1_ATTRIBUTE(c_chmask); 736UAC1_ATTRIBUTE(c_srate); 737UAC1_ATTRIBUTE(c_ssize); 738UAC1_ATTRIBUTE(p_chmask); 739UAC1_ATTRIBUTE(p_srate); 740UAC1_ATTRIBUTE(p_ssize); 741UAC1_ATTRIBUTE(req_number); 742 743static struct configfs_attribute *f_uac1_attrs[] = { 744 &f_uac1_opts_attr_c_chmask, 745 &f_uac1_opts_attr_c_srate, 746 &f_uac1_opts_attr_c_ssize, 747 &f_uac1_opts_attr_p_chmask, 748 &f_uac1_opts_attr_p_srate, 749 &f_uac1_opts_attr_p_ssize, 750 &f_uac1_opts_attr_req_number, 751 NULL, 752}; 753 754static const struct config_item_type f_uac1_func_type = { 755 .ct_item_ops = &f_uac1_item_ops, 756 .ct_attrs = f_uac1_attrs, 757 .ct_owner = THIS_MODULE, 758}; 759 760static void f_audio_free_inst(struct usb_function_instance *f) 761{ 762 struct f_uac1_opts *opts; 763 764 opts = container_of(f, struct f_uac1_opts, func_inst); 765 kfree(opts); 766} 767 768static struct usb_function_instance *f_audio_alloc_inst(void) 769{ 770 struct f_uac1_opts *opts; 771 772 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 773 if (!opts) 774 return ERR_PTR(-ENOMEM); 775 776 mutex_init(&opts->lock); 777 opts->func_inst.free_func_inst = f_audio_free_inst; 778 779 config_group_init_type_name(&opts->func_inst.group, "", 780 &f_uac1_func_type); 781 782 opts->c_chmask = UAC1_DEF_CCHMASK; 783 opts->c_srate = UAC1_DEF_CSRATE; 784 opts->c_ssize = UAC1_DEF_CSSIZE; 785 opts->p_chmask = UAC1_DEF_PCHMASK; 786 opts->p_srate = UAC1_DEF_PSRATE; 787 opts->p_ssize = UAC1_DEF_PSSIZE; 788 opts->req_number = UAC1_DEF_REQ_NUM; 789 return &opts->func_inst; 790} 791 792static void f_audio_free(struct usb_function *f) 793{ 794 struct g_audio *audio; 795 struct f_uac1_opts *opts; 796 797 audio = func_to_g_audio(f); 798 opts = container_of(f->fi, struct f_uac1_opts, func_inst); 799 kfree(audio); 800 mutex_lock(&opts->lock); 801 --opts->refcnt; 802 mutex_unlock(&opts->lock); 803} 804 805static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f) 806{ 807 struct g_audio *audio = func_to_g_audio(f); 808 809 g_audio_cleanup(audio); 810 usb_free_all_descriptors(f); 811 812 audio->gadget = NULL; 813} 814 815static struct usb_function *f_audio_alloc(struct usb_function_instance *fi) 816{ 817 struct f_uac1 *uac1; 818 struct f_uac1_opts *opts; 819 820 /* allocate and initialize one new instance */ 821 uac1 = kzalloc(sizeof(*uac1), GFP_KERNEL); 822 if (!uac1) 823 return ERR_PTR(-ENOMEM); 824 825 opts = container_of(fi, struct f_uac1_opts, func_inst); 826 mutex_lock(&opts->lock); 827 ++opts->refcnt; 828 mutex_unlock(&opts->lock); 829 830 uac1->g_audio.func.name = "uac1_func"; 831 uac1->g_audio.func.bind = f_audio_bind; 832 uac1->g_audio.func.unbind = f_audio_unbind; 833 uac1->g_audio.func.set_alt = f_audio_set_alt; 834 uac1->g_audio.func.get_alt = f_audio_get_alt; 835 uac1->g_audio.func.setup = f_audio_setup; 836 uac1->g_audio.func.disable = f_audio_disable; 837 uac1->g_audio.func.free_func = f_audio_free; 838 839 return &uac1->g_audio.func; 840} 841 842DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc); 843MODULE_LICENSE("GPL"); 844MODULE_AUTHOR("Ruslan Bilovol"); 845