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