1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * f_uac2.c -- USB Audio Class 2.0 Function 4 * 5 * Copyright (C) 2011 6 * Yadwinder Singh (yadi.brar01@gmail.com) 7 * Jaswinder Singh (jaswinder.singh@linaro.org) 8 */ 9 10 #include <linux/usb/audio.h> 11 #include <linux/usb/audio-v2.h> 12 #include <linux/module.h> 13 14 #include "u_audio.h" 15 #include "u_uac2.h" 16 17 /* 18 * The driver implements a simple UAC_2 topology. 19 * USB-OUT -> IT_1 -> OT_3 -> ALSA_Capture 20 * ALSA_Playback -> IT_2 -> OT_4 -> USB-IN 21 * Capture and Playback sampling rates are independently 22 * controlled by two clock sources : 23 * CLK_5 := c_srate, and CLK_6 := p_srate 24 */ 25 #define USB_OUT_CLK_ID (out_clk_src_desc.bClockID) 26 #define USB_IN_CLK_ID (in_clk_src_desc.bClockID) 27 28 #define CONTROL_ABSENT 0 29 #define CONTROL_RDONLY 1 30 #define CONTROL_RDWR 3 31 32 #define CLK_FREQ_CTRL 0 33 #define CLK_VLD_CTRL 2 34 35 #define COPY_CTRL 0 36 #define CONN_CTRL 2 37 #define OVRLD_CTRL 4 38 #define CLSTR_CTRL 6 39 #define UNFLW_CTRL 8 40 #define OVFLW_CTRL 10 41 42 #define EPIN_EN(_opts) ((_opts)->p_chmask != 0) 43 #define EPOUT_EN(_opts) ((_opts)->c_chmask != 0) 44 45 struct f_uac2 { 46 struct g_audio g_audio; 47 u8 ac_intf, as_in_intf, as_out_intf; 48 u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */ 49 }; 50 51 static inline struct f_uac2 *func_to_uac2(struct usb_function *f) 52 { 53 return container_of(f, struct f_uac2, g_audio.func); 54 } 55 56 static inline 57 struct f_uac2_opts *g_audio_to_uac2_opts(struct g_audio *agdev) 58 { 59 return container_of(agdev->func.fi, struct f_uac2_opts, func_inst); 60 } 61 62 /* --------- USB Function Interface ------------- */ 63 64 enum { 65 STR_ASSOC, 66 STR_IF_CTRL, 67 STR_CLKSRC_IN, 68 STR_CLKSRC_OUT, 69 STR_USB_IT, 70 STR_IO_IT, 71 STR_USB_OT, 72 STR_IO_OT, 73 STR_AS_OUT_ALT0, 74 STR_AS_OUT_ALT1, 75 STR_AS_IN_ALT0, 76 STR_AS_IN_ALT1, 77 }; 78 79 static char clksrc_in[8]; 80 static char clksrc_out[8]; 81 82 static struct usb_string strings_fn[] = { 83 [STR_ASSOC].s = "Source/Sink", 84 [STR_IF_CTRL].s = "Topology Control", 85 [STR_CLKSRC_IN].s = clksrc_in, 86 [STR_CLKSRC_OUT].s = clksrc_out, 87 [STR_USB_IT].s = "USBH Out", 88 [STR_IO_IT].s = "USBD Out", 89 [STR_USB_OT].s = "USBH In", 90 [STR_IO_OT].s = "USBD In", 91 [STR_AS_OUT_ALT0].s = "Playback Inactive", 92 [STR_AS_OUT_ALT1].s = "Playback Active", 93 [STR_AS_IN_ALT0].s = "Capture Inactive", 94 [STR_AS_IN_ALT1].s = "Capture Active", 95 { }, 96 }; 97 98 static struct usb_gadget_strings str_fn = { 99 .language = 0x0409, /* en-us */ 100 .strings = strings_fn, 101 }; 102 103 static struct usb_gadget_strings *fn_strings[] = { 104 &str_fn, 105 NULL, 106 }; 107 108 static struct usb_interface_assoc_descriptor iad_desc = { 109 .bLength = sizeof iad_desc, 110 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION, 111 112 .bFirstInterface = 0, 113 .bInterfaceCount = 3, 114 .bFunctionClass = USB_CLASS_AUDIO, 115 .bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED, 116 .bFunctionProtocol = UAC_VERSION_2, 117 }; 118 119 /* Audio Control Interface */ 120 static struct usb_interface_descriptor std_ac_if_desc = { 121 .bLength = sizeof std_ac_if_desc, 122 .bDescriptorType = USB_DT_INTERFACE, 123 124 .bAlternateSetting = 0, 125 .bNumEndpoints = 0, 126 .bInterfaceClass = USB_CLASS_AUDIO, 127 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, 128 .bInterfaceProtocol = UAC_VERSION_2, 129 }; 130 131 /* Clock source for IN traffic */ 132 static struct uac_clock_source_descriptor in_clk_src_desc = { 133 .bLength = sizeof in_clk_src_desc, 134 .bDescriptorType = USB_DT_CS_INTERFACE, 135 136 .bDescriptorSubtype = UAC2_CLOCK_SOURCE, 137 /* .bClockID = DYNAMIC */ 138 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED, 139 .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL), 140 .bAssocTerminal = 0, 141 }; 142 143 /* Clock source for OUT traffic */ 144 static struct uac_clock_source_descriptor out_clk_src_desc = { 145 .bLength = sizeof out_clk_src_desc, 146 .bDescriptorType = USB_DT_CS_INTERFACE, 147 148 .bDescriptorSubtype = UAC2_CLOCK_SOURCE, 149 /* .bClockID = DYNAMIC */ 150 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED, 151 .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL), 152 .bAssocTerminal = 0, 153 }; 154 155 /* Input Terminal for USB_OUT */ 156 static struct uac2_input_terminal_descriptor usb_out_it_desc = { 157 .bLength = sizeof usb_out_it_desc, 158 .bDescriptorType = USB_DT_CS_INTERFACE, 159 160 .bDescriptorSubtype = UAC_INPUT_TERMINAL, 161 /* .bTerminalID = DYNAMIC */ 162 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING), 163 .bAssocTerminal = 0, 164 /* .bCSourceID = DYNAMIC */ 165 .iChannelNames = 0, 166 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL), 167 }; 168 169 /* Input Terminal for I/O-In */ 170 static struct uac2_input_terminal_descriptor io_in_it_desc = { 171 .bLength = sizeof io_in_it_desc, 172 .bDescriptorType = USB_DT_CS_INTERFACE, 173 174 .bDescriptorSubtype = UAC_INPUT_TERMINAL, 175 /* .bTerminalID = DYNAMIC */ 176 .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_UNDEFINED), 177 .bAssocTerminal = 0, 178 /* .bCSourceID = DYNAMIC */ 179 .iChannelNames = 0, 180 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL), 181 }; 182 183 /* Ouput Terminal for USB_IN */ 184 static struct uac2_output_terminal_descriptor usb_in_ot_desc = { 185 .bLength = sizeof usb_in_ot_desc, 186 .bDescriptorType = USB_DT_CS_INTERFACE, 187 188 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, 189 /* .bTerminalID = DYNAMIC */ 190 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING), 191 .bAssocTerminal = 0, 192 /* .bSourceID = DYNAMIC */ 193 /* .bCSourceID = DYNAMIC */ 194 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL), 195 }; 196 197 /* Ouput Terminal for I/O-Out */ 198 static struct uac2_output_terminal_descriptor io_out_ot_desc = { 199 .bLength = sizeof io_out_ot_desc, 200 .bDescriptorType = USB_DT_CS_INTERFACE, 201 202 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, 203 /* .bTerminalID = DYNAMIC */ 204 .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_UNDEFINED), 205 .bAssocTerminal = 0, 206 /* .bSourceID = DYNAMIC */ 207 /* .bCSourceID = DYNAMIC */ 208 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL), 209 }; 210 211 static struct uac2_ac_header_descriptor ac_hdr_desc = { 212 .bLength = sizeof ac_hdr_desc, 213 .bDescriptorType = USB_DT_CS_INTERFACE, 214 215 .bDescriptorSubtype = UAC_MS_HEADER, 216 .bcdADC = cpu_to_le16(0x200), 217 .bCategory = UAC2_FUNCTION_IO_BOX, 218 /* .wTotalLength = DYNAMIC */ 219 .bmControls = 0, 220 }; 221 222 /* Audio Streaming OUT Interface - Alt0 */ 223 static struct usb_interface_descriptor std_as_out_if0_desc = { 224 .bLength = sizeof std_as_out_if0_desc, 225 .bDescriptorType = USB_DT_INTERFACE, 226 227 .bAlternateSetting = 0, 228 .bNumEndpoints = 0, 229 .bInterfaceClass = USB_CLASS_AUDIO, 230 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 231 .bInterfaceProtocol = UAC_VERSION_2, 232 }; 233 234 /* Audio Streaming OUT Interface - Alt1 */ 235 static struct usb_interface_descriptor std_as_out_if1_desc = { 236 .bLength = sizeof std_as_out_if1_desc, 237 .bDescriptorType = USB_DT_INTERFACE, 238 239 .bAlternateSetting = 1, 240 .bNumEndpoints = 1, 241 .bInterfaceClass = USB_CLASS_AUDIO, 242 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 243 .bInterfaceProtocol = UAC_VERSION_2, 244 }; 245 246 /* Audio Stream OUT Intface Desc */ 247 static struct uac2_as_header_descriptor as_out_hdr_desc = { 248 .bLength = sizeof as_out_hdr_desc, 249 .bDescriptorType = USB_DT_CS_INTERFACE, 250 251 .bDescriptorSubtype = UAC_AS_GENERAL, 252 /* .bTerminalLink = DYNAMIC */ 253 .bmControls = 0, 254 .bFormatType = UAC_FORMAT_TYPE_I, 255 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM), 256 .iChannelNames = 0, 257 }; 258 259 /* Audio USB_OUT Format */ 260 static struct uac2_format_type_i_descriptor as_out_fmt1_desc = { 261 .bLength = sizeof as_out_fmt1_desc, 262 .bDescriptorType = USB_DT_CS_INTERFACE, 263 .bDescriptorSubtype = UAC_FORMAT_TYPE, 264 .bFormatType = UAC_FORMAT_TYPE_I, 265 }; 266 267 /* STD AS ISO OUT Endpoint */ 268 static struct usb_endpoint_descriptor fs_epout_desc = { 269 .bLength = USB_DT_ENDPOINT_SIZE, 270 .bDescriptorType = USB_DT_ENDPOINT, 271 272 .bEndpointAddress = USB_DIR_OUT, 273 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 274 .wMaxPacketSize = cpu_to_le16(1023), 275 .bInterval = 1, 276 }; 277 278 static struct usb_endpoint_descriptor hs_epout_desc = { 279 .bLength = USB_DT_ENDPOINT_SIZE, 280 .bDescriptorType = USB_DT_ENDPOINT, 281 282 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 283 .wMaxPacketSize = cpu_to_le16(1024), 284 .bInterval = 4, 285 }; 286 287 /* CS AS ISO OUT Endpoint */ 288 static struct uac2_iso_endpoint_descriptor as_iso_out_desc = { 289 .bLength = sizeof as_iso_out_desc, 290 .bDescriptorType = USB_DT_CS_ENDPOINT, 291 292 .bDescriptorSubtype = UAC_EP_GENERAL, 293 .bmAttributes = 0, 294 .bmControls = 0, 295 .bLockDelayUnits = 0, 296 .wLockDelay = 0, 297 }; 298 299 /* Audio Streaming IN Interface - Alt0 */ 300 static struct usb_interface_descriptor std_as_in_if0_desc = { 301 .bLength = sizeof std_as_in_if0_desc, 302 .bDescriptorType = USB_DT_INTERFACE, 303 304 .bAlternateSetting = 0, 305 .bNumEndpoints = 0, 306 .bInterfaceClass = USB_CLASS_AUDIO, 307 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 308 .bInterfaceProtocol = UAC_VERSION_2, 309 }; 310 311 /* Audio Streaming IN Interface - Alt1 */ 312 static struct usb_interface_descriptor std_as_in_if1_desc = { 313 .bLength = sizeof std_as_in_if1_desc, 314 .bDescriptorType = USB_DT_INTERFACE, 315 316 .bAlternateSetting = 1, 317 .bNumEndpoints = 1, 318 .bInterfaceClass = USB_CLASS_AUDIO, 319 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 320 .bInterfaceProtocol = UAC_VERSION_2, 321 }; 322 323 /* Audio Stream IN Intface Desc */ 324 static struct uac2_as_header_descriptor as_in_hdr_desc = { 325 .bLength = sizeof as_in_hdr_desc, 326 .bDescriptorType = USB_DT_CS_INTERFACE, 327 328 .bDescriptorSubtype = UAC_AS_GENERAL, 329 /* .bTerminalLink = DYNAMIC */ 330 .bmControls = 0, 331 .bFormatType = UAC_FORMAT_TYPE_I, 332 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM), 333 .iChannelNames = 0, 334 }; 335 336 /* Audio USB_IN Format */ 337 static struct uac2_format_type_i_descriptor as_in_fmt1_desc = { 338 .bLength = sizeof as_in_fmt1_desc, 339 .bDescriptorType = USB_DT_CS_INTERFACE, 340 .bDescriptorSubtype = UAC_FORMAT_TYPE, 341 .bFormatType = UAC_FORMAT_TYPE_I, 342 }; 343 344 /* STD AS ISO IN Endpoint */ 345 static struct usb_endpoint_descriptor fs_epin_desc = { 346 .bLength = USB_DT_ENDPOINT_SIZE, 347 .bDescriptorType = USB_DT_ENDPOINT, 348 349 .bEndpointAddress = USB_DIR_IN, 350 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 351 .wMaxPacketSize = cpu_to_le16(1023), 352 .bInterval = 1, 353 }; 354 355 static struct usb_endpoint_descriptor hs_epin_desc = { 356 .bLength = USB_DT_ENDPOINT_SIZE, 357 .bDescriptorType = USB_DT_ENDPOINT, 358 359 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 360 .wMaxPacketSize = cpu_to_le16(1024), 361 .bInterval = 4, 362 }; 363 364 /* CS AS ISO IN Endpoint */ 365 static struct uac2_iso_endpoint_descriptor as_iso_in_desc = { 366 .bLength = sizeof as_iso_in_desc, 367 .bDescriptorType = USB_DT_CS_ENDPOINT, 368 369 .bDescriptorSubtype = UAC_EP_GENERAL, 370 .bmAttributes = 0, 371 .bmControls = 0, 372 .bLockDelayUnits = 0, 373 .wLockDelay = 0, 374 }; 375 376 static struct usb_descriptor_header *fs_audio_desc[] = { 377 (struct usb_descriptor_header *)&iad_desc, 378 (struct usb_descriptor_header *)&std_ac_if_desc, 379 380 (struct usb_descriptor_header *)&ac_hdr_desc, 381 (struct usb_descriptor_header *)&in_clk_src_desc, 382 (struct usb_descriptor_header *)&out_clk_src_desc, 383 (struct usb_descriptor_header *)&usb_out_it_desc, 384 (struct usb_descriptor_header *)&io_in_it_desc, 385 (struct usb_descriptor_header *)&usb_in_ot_desc, 386 (struct usb_descriptor_header *)&io_out_ot_desc, 387 388 (struct usb_descriptor_header *)&std_as_out_if0_desc, 389 (struct usb_descriptor_header *)&std_as_out_if1_desc, 390 391 (struct usb_descriptor_header *)&as_out_hdr_desc, 392 (struct usb_descriptor_header *)&as_out_fmt1_desc, 393 (struct usb_descriptor_header *)&fs_epout_desc, 394 (struct usb_descriptor_header *)&as_iso_out_desc, 395 396 (struct usb_descriptor_header *)&std_as_in_if0_desc, 397 (struct usb_descriptor_header *)&std_as_in_if1_desc, 398 399 (struct usb_descriptor_header *)&as_in_hdr_desc, 400 (struct usb_descriptor_header *)&as_in_fmt1_desc, 401 (struct usb_descriptor_header *)&fs_epin_desc, 402 (struct usb_descriptor_header *)&as_iso_in_desc, 403 NULL, 404 }; 405 406 static struct usb_descriptor_header *hs_audio_desc[] = { 407 (struct usb_descriptor_header *)&iad_desc, 408 (struct usb_descriptor_header *)&std_ac_if_desc, 409 410 (struct usb_descriptor_header *)&ac_hdr_desc, 411 (struct usb_descriptor_header *)&in_clk_src_desc, 412 (struct usb_descriptor_header *)&out_clk_src_desc, 413 (struct usb_descriptor_header *)&usb_out_it_desc, 414 (struct usb_descriptor_header *)&io_in_it_desc, 415 (struct usb_descriptor_header *)&usb_in_ot_desc, 416 (struct usb_descriptor_header *)&io_out_ot_desc, 417 418 (struct usb_descriptor_header *)&std_as_out_if0_desc, 419 (struct usb_descriptor_header *)&std_as_out_if1_desc, 420 421 (struct usb_descriptor_header *)&as_out_hdr_desc, 422 (struct usb_descriptor_header *)&as_out_fmt1_desc, 423 (struct usb_descriptor_header *)&hs_epout_desc, 424 (struct usb_descriptor_header *)&as_iso_out_desc, 425 426 (struct usb_descriptor_header *)&std_as_in_if0_desc, 427 (struct usb_descriptor_header *)&std_as_in_if1_desc, 428 429 (struct usb_descriptor_header *)&as_in_hdr_desc, 430 (struct usb_descriptor_header *)&as_in_fmt1_desc, 431 (struct usb_descriptor_header *)&hs_epin_desc, 432 (struct usb_descriptor_header *)&as_iso_in_desc, 433 NULL, 434 }; 435 436 struct cntrl_cur_lay3 { 437 __le32 dCUR; 438 }; 439 440 struct cntrl_range_lay3 { 441 __le16 wNumSubRanges; 442 __le32 dMIN; 443 __le32 dMAX; 444 __le32 dRES; 445 } __packed; 446 447 static void set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts, 448 struct usb_endpoint_descriptor *ep_desc, 449 unsigned int factor, bool is_playback) 450 { 451 int chmask, srate, ssize; 452 u16 max_packet_size; 453 454 if (is_playback) { 455 chmask = uac2_opts->p_chmask; 456 srate = uac2_opts->p_srate; 457 ssize = uac2_opts->p_ssize; 458 } else { 459 chmask = uac2_opts->c_chmask; 460 srate = uac2_opts->c_srate; 461 ssize = uac2_opts->c_ssize; 462 } 463 464 max_packet_size = num_channels(chmask) * ssize * 465 DIV_ROUND_UP(srate, factor / (1 << (ep_desc->bInterval - 1))); 466 ep_desc->wMaxPacketSize = cpu_to_le16(min_t(u16, max_packet_size, 467 le16_to_cpu(ep_desc->wMaxPacketSize))); 468 } 469 470 /* Use macro to overcome line length limitation */ 471 #define USBDHDR(p) (struct usb_descriptor_header *)(p) 472 473 static void setup_descriptor(struct f_uac2_opts *opts) 474 { 475 /* patch descriptors */ 476 int i = 1; /* ID's start with 1 */ 477 478 if (EPOUT_EN(opts)) 479 usb_out_it_desc.bTerminalID = i++; 480 if (EPIN_EN(opts)) 481 io_in_it_desc.bTerminalID = i++; 482 if (EPOUT_EN(opts)) 483 io_out_ot_desc.bTerminalID = i++; 484 if (EPIN_EN(opts)) 485 usb_in_ot_desc.bTerminalID = i++; 486 if (EPOUT_EN(opts)) 487 out_clk_src_desc.bClockID = i++; 488 if (EPIN_EN(opts)) 489 in_clk_src_desc.bClockID = i++; 490 491 usb_out_it_desc.bCSourceID = out_clk_src_desc.bClockID; 492 usb_in_ot_desc.bSourceID = io_in_it_desc.bTerminalID; 493 usb_in_ot_desc.bCSourceID = in_clk_src_desc.bClockID; 494 io_in_it_desc.bCSourceID = in_clk_src_desc.bClockID; 495 io_out_ot_desc.bCSourceID = out_clk_src_desc.bClockID; 496 io_out_ot_desc.bSourceID = usb_out_it_desc.bTerminalID; 497 as_out_hdr_desc.bTerminalLink = usb_out_it_desc.bTerminalID; 498 as_in_hdr_desc.bTerminalLink = usb_in_ot_desc.bTerminalID; 499 500 iad_desc.bInterfaceCount = 1; 501 ac_hdr_desc.wTotalLength = cpu_to_le16(sizeof(ac_hdr_desc)); 502 503 if (EPIN_EN(opts)) { 504 u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength); 505 506 len += sizeof(in_clk_src_desc); 507 len += sizeof(usb_in_ot_desc); 508 len += sizeof(io_in_it_desc); 509 ac_hdr_desc.wTotalLength = cpu_to_le16(len); 510 iad_desc.bInterfaceCount++; 511 } 512 if (EPOUT_EN(opts)) { 513 u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength); 514 515 len += sizeof(out_clk_src_desc); 516 len += sizeof(usb_out_it_desc); 517 len += sizeof(io_out_ot_desc); 518 ac_hdr_desc.wTotalLength = cpu_to_le16(len); 519 iad_desc.bInterfaceCount++; 520 } 521 522 i = 0; 523 fs_audio_desc[i++] = USBDHDR(&iad_desc); 524 fs_audio_desc[i++] = USBDHDR(&std_ac_if_desc); 525 fs_audio_desc[i++] = USBDHDR(&ac_hdr_desc); 526 if (EPIN_EN(opts)) 527 fs_audio_desc[i++] = USBDHDR(&in_clk_src_desc); 528 if (EPOUT_EN(opts)) { 529 fs_audio_desc[i++] = USBDHDR(&out_clk_src_desc); 530 fs_audio_desc[i++] = USBDHDR(&usb_out_it_desc); 531 } 532 if (EPIN_EN(opts)) { 533 fs_audio_desc[i++] = USBDHDR(&io_in_it_desc); 534 fs_audio_desc[i++] = USBDHDR(&usb_in_ot_desc); 535 } 536 if (EPOUT_EN(opts)) { 537 fs_audio_desc[i++] = USBDHDR(&io_out_ot_desc); 538 fs_audio_desc[i++] = USBDHDR(&std_as_out_if0_desc); 539 fs_audio_desc[i++] = USBDHDR(&std_as_out_if1_desc); 540 fs_audio_desc[i++] = USBDHDR(&as_out_hdr_desc); 541 fs_audio_desc[i++] = USBDHDR(&as_out_fmt1_desc); 542 fs_audio_desc[i++] = USBDHDR(&fs_epout_desc); 543 fs_audio_desc[i++] = USBDHDR(&as_iso_out_desc); 544 } 545 if (EPIN_EN(opts)) { 546 fs_audio_desc[i++] = USBDHDR(&std_as_in_if0_desc); 547 fs_audio_desc[i++] = USBDHDR(&std_as_in_if1_desc); 548 fs_audio_desc[i++] = USBDHDR(&as_in_hdr_desc); 549 fs_audio_desc[i++] = USBDHDR(&as_in_fmt1_desc); 550 fs_audio_desc[i++] = USBDHDR(&fs_epin_desc); 551 fs_audio_desc[i++] = USBDHDR(&as_iso_in_desc); 552 } 553 fs_audio_desc[i] = NULL; 554 555 i = 0; 556 hs_audio_desc[i++] = USBDHDR(&iad_desc); 557 hs_audio_desc[i++] = USBDHDR(&std_ac_if_desc); 558 hs_audio_desc[i++] = USBDHDR(&ac_hdr_desc); 559 if (EPIN_EN(opts)) 560 hs_audio_desc[i++] = USBDHDR(&in_clk_src_desc); 561 if (EPOUT_EN(opts)) { 562 hs_audio_desc[i++] = USBDHDR(&out_clk_src_desc); 563 hs_audio_desc[i++] = USBDHDR(&usb_out_it_desc); 564 } 565 if (EPIN_EN(opts)) { 566 hs_audio_desc[i++] = USBDHDR(&io_in_it_desc); 567 hs_audio_desc[i++] = USBDHDR(&usb_in_ot_desc); 568 } 569 if (EPOUT_EN(opts)) { 570 hs_audio_desc[i++] = USBDHDR(&io_out_ot_desc); 571 hs_audio_desc[i++] = USBDHDR(&std_as_out_if0_desc); 572 hs_audio_desc[i++] = USBDHDR(&std_as_out_if1_desc); 573 hs_audio_desc[i++] = USBDHDR(&as_out_hdr_desc); 574 hs_audio_desc[i++] = USBDHDR(&as_out_fmt1_desc); 575 hs_audio_desc[i++] = USBDHDR(&hs_epout_desc); 576 hs_audio_desc[i++] = USBDHDR(&as_iso_out_desc); 577 } 578 if (EPIN_EN(opts)) { 579 hs_audio_desc[i++] = USBDHDR(&std_as_in_if0_desc); 580 hs_audio_desc[i++] = USBDHDR(&std_as_in_if1_desc); 581 hs_audio_desc[i++] = USBDHDR(&as_in_hdr_desc); 582 hs_audio_desc[i++] = USBDHDR(&as_in_fmt1_desc); 583 hs_audio_desc[i++] = USBDHDR(&hs_epin_desc); 584 hs_audio_desc[i++] = USBDHDR(&as_iso_in_desc); 585 } 586 hs_audio_desc[i] = NULL; 587 } 588 589 static int 590 afunc_bind(struct usb_configuration *cfg, struct usb_function *fn) 591 { 592 struct f_uac2 *uac2 = func_to_uac2(fn); 593 struct g_audio *agdev = func_to_g_audio(fn); 594 struct usb_composite_dev *cdev = cfg->cdev; 595 struct usb_gadget *gadget = cdev->gadget; 596 struct device *dev = &gadget->dev; 597 struct f_uac2_opts *uac2_opts; 598 struct usb_string *us; 599 int ret; 600 601 uac2_opts = container_of(fn->fi, struct f_uac2_opts, func_inst); 602 603 us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn)); 604 if (IS_ERR(us)) 605 return PTR_ERR(us); 606 iad_desc.iFunction = us[STR_ASSOC].id; 607 std_ac_if_desc.iInterface = us[STR_IF_CTRL].id; 608 in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id; 609 out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id; 610 usb_out_it_desc.iTerminal = us[STR_USB_IT].id; 611 io_in_it_desc.iTerminal = us[STR_IO_IT].id; 612 usb_in_ot_desc.iTerminal = us[STR_USB_OT].id; 613 io_out_ot_desc.iTerminal = us[STR_IO_OT].id; 614 std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id; 615 std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id; 616 std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id; 617 std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id; 618 619 620 /* Initialize the configurable parameters */ 621 usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask); 622 usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask); 623 io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask); 624 io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask); 625 as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask); 626 as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask); 627 as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask); 628 as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask); 629 as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize; 630 as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8; 631 as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize; 632 as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8; 633 634 snprintf(clksrc_in, sizeof(clksrc_in), "%uHz", uac2_opts->p_srate); 635 snprintf(clksrc_out, sizeof(clksrc_out), "%uHz", uac2_opts->c_srate); 636 637 ret = usb_interface_id(cfg, fn); 638 if (ret < 0) { 639 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 640 return ret; 641 } 642 iad_desc.bFirstInterface = ret; 643 644 std_ac_if_desc.bInterfaceNumber = ret; 645 uac2->ac_intf = ret; 646 uac2->ac_alt = 0; 647 648 if (EPOUT_EN(uac2_opts)) { 649 ret = usb_interface_id(cfg, fn); 650 if (ret < 0) { 651 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 652 return ret; 653 } 654 std_as_out_if0_desc.bInterfaceNumber = ret; 655 std_as_out_if1_desc.bInterfaceNumber = ret; 656 uac2->as_out_intf = ret; 657 uac2->as_out_alt = 0; 658 } 659 660 if (EPIN_EN(uac2_opts)) { 661 ret = usb_interface_id(cfg, fn); 662 if (ret < 0) { 663 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 664 return ret; 665 } 666 std_as_in_if0_desc.bInterfaceNumber = ret; 667 std_as_in_if1_desc.bInterfaceNumber = ret; 668 uac2->as_in_intf = ret; 669 uac2->as_in_alt = 0; 670 } 671 672 /* Calculate wMaxPacketSize according to audio bandwidth */ 673 set_ep_max_packet_size(uac2_opts, &fs_epin_desc, 1000, true); 674 set_ep_max_packet_size(uac2_opts, &fs_epout_desc, 1000, false); 675 set_ep_max_packet_size(uac2_opts, &hs_epin_desc, 8000, true); 676 set_ep_max_packet_size(uac2_opts, &hs_epout_desc, 8000, false); 677 678 if (EPOUT_EN(uac2_opts)) { 679 agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc); 680 if (!agdev->out_ep) { 681 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 682 return -ENODEV; 683 } 684 } 685 686 if (EPIN_EN(uac2_opts)) { 687 agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc); 688 if (!agdev->in_ep) { 689 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 690 return -ENODEV; 691 } 692 } 693 694 agdev->in_ep_maxpsize = max_t(u16, 695 le16_to_cpu(fs_epin_desc.wMaxPacketSize), 696 le16_to_cpu(hs_epin_desc.wMaxPacketSize)); 697 agdev->out_ep_maxpsize = max_t(u16, 698 le16_to_cpu(fs_epout_desc.wMaxPacketSize), 699 le16_to_cpu(hs_epout_desc.wMaxPacketSize)); 700 701 hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress; 702 hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress; 703 704 setup_descriptor(uac2_opts); 705 706 ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, NULL, 707 NULL); 708 if (ret) 709 return ret; 710 711 agdev->gadget = gadget; 712 713 agdev->params.p_chmask = uac2_opts->p_chmask; 714 agdev->params.p_srate = uac2_opts->p_srate; 715 agdev->params.p_ssize = uac2_opts->p_ssize; 716 agdev->params.c_chmask = uac2_opts->c_chmask; 717 agdev->params.c_srate = uac2_opts->c_srate; 718 agdev->params.c_ssize = uac2_opts->c_ssize; 719 agdev->params.req_number = uac2_opts->req_number; 720 ret = g_audio_setup(agdev, "UAC2 PCM", "UAC2_Gadget"); 721 if (ret) 722 goto err_free_descs; 723 return 0; 724 725 err_free_descs: 726 usb_free_all_descriptors(fn); 727 agdev->gadget = NULL; 728 return ret; 729 } 730 731 static int 732 afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt) 733 { 734 struct usb_composite_dev *cdev = fn->config->cdev; 735 struct f_uac2 *uac2 = func_to_uac2(fn); 736 struct usb_gadget *gadget = cdev->gadget; 737 struct device *dev = &gadget->dev; 738 int ret = 0; 739 740 /* No i/f has more than 2 alt settings */ 741 if (alt > 1) { 742 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 743 return -EINVAL; 744 } 745 746 if (intf == uac2->ac_intf) { 747 /* Control I/f has only 1 AltSetting - 0 */ 748 if (alt) { 749 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 750 return -EINVAL; 751 } 752 return 0; 753 } 754 755 if (intf == uac2->as_out_intf) { 756 uac2->as_out_alt = alt; 757 758 if (alt) 759 ret = u_audio_start_capture(&uac2->g_audio); 760 else 761 u_audio_stop_capture(&uac2->g_audio); 762 } else if (intf == uac2->as_in_intf) { 763 uac2->as_in_alt = alt; 764 765 if (alt) 766 ret = u_audio_start_playback(&uac2->g_audio); 767 else 768 u_audio_stop_playback(&uac2->g_audio); 769 } else { 770 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 771 return -EINVAL; 772 } 773 774 return ret; 775 } 776 777 static int 778 afunc_get_alt(struct usb_function *fn, unsigned intf) 779 { 780 struct f_uac2 *uac2 = func_to_uac2(fn); 781 struct g_audio *agdev = func_to_g_audio(fn); 782 783 if (intf == uac2->ac_intf) 784 return uac2->ac_alt; 785 else if (intf == uac2->as_out_intf) 786 return uac2->as_out_alt; 787 else if (intf == uac2->as_in_intf) 788 return uac2->as_in_alt; 789 else 790 dev_err(&agdev->gadget->dev, 791 "%s:%d Invalid Interface %d!\n", 792 __func__, __LINE__, intf); 793 794 return -EINVAL; 795 } 796 797 static void 798 afunc_disable(struct usb_function *fn) 799 { 800 struct f_uac2 *uac2 = func_to_uac2(fn); 801 802 uac2->as_in_alt = 0; 803 uac2->as_out_alt = 0; 804 u_audio_stop_capture(&uac2->g_audio); 805 u_audio_stop_playback(&uac2->g_audio); 806 } 807 808 static int 809 in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr) 810 { 811 struct usb_request *req = fn->config->cdev->req; 812 struct g_audio *agdev = func_to_g_audio(fn); 813 struct f_uac2_opts *opts; 814 u16 w_length = le16_to_cpu(cr->wLength); 815 u16 w_index = le16_to_cpu(cr->wIndex); 816 u16 w_value = le16_to_cpu(cr->wValue); 817 u8 entity_id = (w_index >> 8) & 0xff; 818 u8 control_selector = w_value >> 8; 819 int value = -EOPNOTSUPP; 820 int p_srate, c_srate; 821 822 opts = g_audio_to_uac2_opts(agdev); 823 p_srate = opts->p_srate; 824 c_srate = opts->c_srate; 825 826 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) { 827 struct cntrl_cur_lay3 c; 828 memset(&c, 0, sizeof(struct cntrl_cur_lay3)); 829 830 if (entity_id == USB_IN_CLK_ID) 831 c.dCUR = cpu_to_le32(p_srate); 832 else if (entity_id == USB_OUT_CLK_ID) 833 c.dCUR = cpu_to_le32(c_srate); 834 835 value = min_t(unsigned, w_length, sizeof c); 836 memcpy(req->buf, &c, value); 837 } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) { 838 *(u8 *)req->buf = 1; 839 value = min_t(unsigned, w_length, 1); 840 } else { 841 dev_err(&agdev->gadget->dev, 842 "%s:%d control_selector=%d TODO!\n", 843 __func__, __LINE__, control_selector); 844 } 845 846 return value; 847 } 848 849 static int 850 in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr) 851 { 852 struct usb_request *req = fn->config->cdev->req; 853 struct g_audio *agdev = func_to_g_audio(fn); 854 struct f_uac2_opts *opts; 855 u16 w_length = le16_to_cpu(cr->wLength); 856 u16 w_index = le16_to_cpu(cr->wIndex); 857 u16 w_value = le16_to_cpu(cr->wValue); 858 u8 entity_id = (w_index >> 8) & 0xff; 859 u8 control_selector = w_value >> 8; 860 struct cntrl_range_lay3 r; 861 int value = -EOPNOTSUPP; 862 int p_srate, c_srate; 863 864 opts = g_audio_to_uac2_opts(agdev); 865 p_srate = opts->p_srate; 866 c_srate = opts->c_srate; 867 868 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) { 869 if (entity_id == USB_IN_CLK_ID) 870 r.dMIN = cpu_to_le32(p_srate); 871 else if (entity_id == USB_OUT_CLK_ID) 872 r.dMIN = cpu_to_le32(c_srate); 873 else 874 return -EOPNOTSUPP; 875 876 r.dMAX = r.dMIN; 877 r.dRES = 0; 878 r.wNumSubRanges = cpu_to_le16(1); 879 880 value = min_t(unsigned, w_length, sizeof r); 881 memcpy(req->buf, &r, value); 882 } else { 883 dev_err(&agdev->gadget->dev, 884 "%s:%d control_selector=%d TODO!\n", 885 __func__, __LINE__, control_selector); 886 } 887 888 return value; 889 } 890 891 static int 892 ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr) 893 { 894 if (cr->bRequest == UAC2_CS_CUR) 895 return in_rq_cur(fn, cr); 896 else if (cr->bRequest == UAC2_CS_RANGE) 897 return in_rq_range(fn, cr); 898 else 899 return -EOPNOTSUPP; 900 } 901 902 static int 903 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr) 904 { 905 u16 w_length = le16_to_cpu(cr->wLength); 906 u16 w_value = le16_to_cpu(cr->wValue); 907 u8 control_selector = w_value >> 8; 908 909 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) 910 return w_length; 911 912 return -EOPNOTSUPP; 913 } 914 915 static int 916 setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr) 917 { 918 struct f_uac2 *uac2 = func_to_uac2(fn); 919 struct g_audio *agdev = func_to_g_audio(fn); 920 u16 w_index = le16_to_cpu(cr->wIndex); 921 u8 intf = w_index & 0xff; 922 923 if (intf != uac2->ac_intf) { 924 dev_err(&agdev->gadget->dev, 925 "%s:%d Error!\n", __func__, __LINE__); 926 return -EOPNOTSUPP; 927 } 928 929 if (cr->bRequestType & USB_DIR_IN) 930 return ac_rq_in(fn, cr); 931 else if (cr->bRequest == UAC2_CS_CUR) 932 return out_rq_cur(fn, cr); 933 934 return -EOPNOTSUPP; 935 } 936 937 static int 938 afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr) 939 { 940 struct usb_composite_dev *cdev = fn->config->cdev; 941 struct g_audio *agdev = func_to_g_audio(fn); 942 struct usb_request *req = cdev->req; 943 u16 w_length = le16_to_cpu(cr->wLength); 944 int value = -EOPNOTSUPP; 945 946 /* Only Class specific requests are supposed to reach here */ 947 if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) 948 return -EOPNOTSUPP; 949 950 if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE) 951 value = setup_rq_inf(fn, cr); 952 else 953 dev_err(&agdev->gadget->dev, "%s:%d Error!\n", 954 __func__, __LINE__); 955 956 if (value >= 0) { 957 req->length = value; 958 req->zero = value < w_length; 959 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); 960 if (value < 0) { 961 dev_err(&agdev->gadget->dev, 962 "%s:%d Error!\n", __func__, __LINE__); 963 req->status = 0; 964 } 965 } 966 967 return value; 968 } 969 970 static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item) 971 { 972 return container_of(to_config_group(item), struct f_uac2_opts, 973 func_inst.group); 974 } 975 976 static void f_uac2_attr_release(struct config_item *item) 977 { 978 struct f_uac2_opts *opts = to_f_uac2_opts(item); 979 980 usb_put_function_instance(&opts->func_inst); 981 } 982 983 static struct configfs_item_operations f_uac2_item_ops = { 984 .release = f_uac2_attr_release, 985 }; 986 987 #define UAC2_ATTRIBUTE(name) \ 988 static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \ 989 char *page) \ 990 { \ 991 struct f_uac2_opts *opts = to_f_uac2_opts(item); \ 992 int result; \ 993 \ 994 mutex_lock(&opts->lock); \ 995 result = sprintf(page, "%u\n", opts->name); \ 996 mutex_unlock(&opts->lock); \ 997 \ 998 return result; \ 999 } \ 1000 \ 1001 static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \ 1002 const char *page, size_t len) \ 1003 { \ 1004 struct f_uac2_opts *opts = to_f_uac2_opts(item); \ 1005 int ret; \ 1006 u32 num; \ 1007 \ 1008 mutex_lock(&opts->lock); \ 1009 if (opts->refcnt) { \ 1010 ret = -EBUSY; \ 1011 goto end; \ 1012 } \ 1013 \ 1014 ret = kstrtou32(page, 0, &num); \ 1015 if (ret) \ 1016 goto end; \ 1017 \ 1018 opts->name = num; \ 1019 ret = len; \ 1020 \ 1021 end: \ 1022 mutex_unlock(&opts->lock); \ 1023 return ret; \ 1024 } \ 1025 \ 1026 CONFIGFS_ATTR(f_uac2_opts_, name) 1027 1028 UAC2_ATTRIBUTE(p_chmask); 1029 UAC2_ATTRIBUTE(p_srate); 1030 UAC2_ATTRIBUTE(p_ssize); 1031 UAC2_ATTRIBUTE(c_chmask); 1032 UAC2_ATTRIBUTE(c_srate); 1033 UAC2_ATTRIBUTE(c_ssize); 1034 UAC2_ATTRIBUTE(req_number); 1035 1036 static struct configfs_attribute *f_uac2_attrs[] = { 1037 &f_uac2_opts_attr_p_chmask, 1038 &f_uac2_opts_attr_p_srate, 1039 &f_uac2_opts_attr_p_ssize, 1040 &f_uac2_opts_attr_c_chmask, 1041 &f_uac2_opts_attr_c_srate, 1042 &f_uac2_opts_attr_c_ssize, 1043 &f_uac2_opts_attr_req_number, 1044 NULL, 1045 }; 1046 1047 static const struct config_item_type f_uac2_func_type = { 1048 .ct_item_ops = &f_uac2_item_ops, 1049 .ct_attrs = f_uac2_attrs, 1050 .ct_owner = THIS_MODULE, 1051 }; 1052 1053 static void afunc_free_inst(struct usb_function_instance *f) 1054 { 1055 struct f_uac2_opts *opts; 1056 1057 opts = container_of(f, struct f_uac2_opts, func_inst); 1058 kfree(opts); 1059 } 1060 1061 static struct usb_function_instance *afunc_alloc_inst(void) 1062 { 1063 struct f_uac2_opts *opts; 1064 1065 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 1066 if (!opts) 1067 return ERR_PTR(-ENOMEM); 1068 1069 mutex_init(&opts->lock); 1070 opts->func_inst.free_func_inst = afunc_free_inst; 1071 1072 config_group_init_type_name(&opts->func_inst.group, "", 1073 &f_uac2_func_type); 1074 1075 opts->p_chmask = UAC2_DEF_PCHMASK; 1076 opts->p_srate = UAC2_DEF_PSRATE; 1077 opts->p_ssize = UAC2_DEF_PSSIZE; 1078 opts->c_chmask = UAC2_DEF_CCHMASK; 1079 opts->c_srate = UAC2_DEF_CSRATE; 1080 opts->c_ssize = UAC2_DEF_CSSIZE; 1081 opts->req_number = UAC2_DEF_REQ_NUM; 1082 return &opts->func_inst; 1083 } 1084 1085 static void afunc_free(struct usb_function *f) 1086 { 1087 struct g_audio *agdev; 1088 struct f_uac2_opts *opts; 1089 1090 agdev = func_to_g_audio(f); 1091 opts = container_of(f->fi, struct f_uac2_opts, func_inst); 1092 kfree(agdev); 1093 mutex_lock(&opts->lock); 1094 --opts->refcnt; 1095 mutex_unlock(&opts->lock); 1096 } 1097 1098 static void afunc_unbind(struct usb_configuration *c, struct usb_function *f) 1099 { 1100 struct g_audio *agdev = func_to_g_audio(f); 1101 1102 g_audio_cleanup(agdev); 1103 usb_free_all_descriptors(f); 1104 1105 agdev->gadget = NULL; 1106 } 1107 1108 static struct usb_function *afunc_alloc(struct usb_function_instance *fi) 1109 { 1110 struct f_uac2 *uac2; 1111 struct f_uac2_opts *opts; 1112 1113 uac2 = kzalloc(sizeof(*uac2), GFP_KERNEL); 1114 if (uac2 == NULL) 1115 return ERR_PTR(-ENOMEM); 1116 1117 opts = container_of(fi, struct f_uac2_opts, func_inst); 1118 mutex_lock(&opts->lock); 1119 ++opts->refcnt; 1120 mutex_unlock(&opts->lock); 1121 1122 uac2->g_audio.func.name = "uac2_func"; 1123 uac2->g_audio.func.bind = afunc_bind; 1124 uac2->g_audio.func.unbind = afunc_unbind; 1125 uac2->g_audio.func.set_alt = afunc_set_alt; 1126 uac2->g_audio.func.get_alt = afunc_get_alt; 1127 uac2->g_audio.func.disable = afunc_disable; 1128 uac2->g_audio.func.setup = afunc_setup; 1129 uac2->g_audio.func.free_func = afunc_free; 1130 1131 return &uac2->g_audio.func; 1132 } 1133 1134 DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc); 1135 MODULE_LICENSE("GPL"); 1136 MODULE_AUTHOR("Yadwinder Singh"); 1137 MODULE_AUTHOR("Jaswinder Singh"); 1138