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