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 * Copyright (C) 2020 10 * Ruslan Bilovol (ruslan.bilovol@gmail.com) 11 */ 12 13 #include <linux/usb/audio.h> 14 #include <linux/usb/audio-v2.h> 15 #include <linux/module.h> 16 17 #include "u_audio.h" 18 19 #include "u_uac2.h" 20 21 /* UAC2 spec: 4.1 Audio Channel Cluster Descriptor */ 22 #define UAC2_CHANNEL_MASK 0x07FFFFFF 23 24 /* 25 * The driver implements a simple UAC_2 topology. 26 * USB-OUT -> IT_1 -> FU -> OT_3 -> ALSA_Capture 27 * ALSA_Playback -> IT_2 -> FU -> OT_4 -> USB-IN 28 * Capture and Playback sampling rates are independently 29 * controlled by two clock sources : 30 * CLK_5 := c_srate, and CLK_6 := p_srate 31 */ 32 #define USB_OUT_CLK_ID (out_clk_src_desc.bClockID) 33 #define USB_IN_CLK_ID (in_clk_src_desc.bClockID) 34 #define USB_OUT_FU_ID (out_feature_unit_desc->bUnitID) 35 #define USB_IN_FU_ID (in_feature_unit_desc->bUnitID) 36 37 #define CONTROL_ABSENT 0 38 #define CONTROL_RDONLY 1 39 #define CONTROL_RDWR 3 40 41 #define CLK_FREQ_CTRL 0 42 #define CLK_VLD_CTRL 2 43 #define FU_MUTE_CTRL 0 44 #define FU_VOL_CTRL 2 45 46 #define COPY_CTRL 0 47 #define CONN_CTRL 2 48 #define OVRLD_CTRL 4 49 #define CLSTR_CTRL 6 50 #define UNFLW_CTRL 8 51 #define OVFLW_CTRL 10 52 53 #define EPIN_EN(_opts) ((_opts)->p_chmask != 0) 54 #define EPOUT_EN(_opts) ((_opts)->c_chmask != 0) 55 #define FUIN_EN(_opts) (EPIN_EN(_opts) \ 56 && ((_opts)->p_mute_present \ 57 || (_opts)->p_volume_present)) 58 #define FUOUT_EN(_opts) (EPOUT_EN(_opts) \ 59 && ((_opts)->c_mute_present \ 60 || (_opts)->c_volume_present)) 61 #define EPOUT_FBACK_IN_EN(_opts) ((_opts)->c_sync == USB_ENDPOINT_SYNC_ASYNC) 62 63 struct f_uac2 { 64 struct g_audio g_audio; 65 u8 ac_intf, as_in_intf, as_out_intf; 66 u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */ 67 68 struct usb_ctrlrequest setup_cr; /* will be used in data stage */ 69 70 /* Interrupt IN endpoint of AC interface */ 71 struct usb_ep *int_ep; 72 atomic_t int_count; 73 /* transient state, only valid during handling of a single control request */ 74 int clock_id; 75 }; 76 77 static inline struct f_uac2 *func_to_uac2(struct usb_function *f) 78 { 79 return container_of(f, struct f_uac2, g_audio.func); 80 } 81 82 static inline 83 struct f_uac2_opts *g_audio_to_uac2_opts(struct g_audio *agdev) 84 { 85 return container_of(agdev->func.fi, struct f_uac2_opts, func_inst); 86 } 87 88 static int afunc_notify(struct g_audio *agdev, int unit_id, int cs); 89 90 /* --------- USB Function Interface ------------- */ 91 92 enum { 93 STR_ASSOC, 94 STR_IF_CTRL, 95 STR_CLKSRC_IN, 96 STR_CLKSRC_OUT, 97 STR_USB_IT, 98 STR_IO_IT, 99 STR_USB_OT, 100 STR_IO_OT, 101 STR_FU_IN, 102 STR_FU_OUT, 103 STR_AS_OUT_ALT0, 104 STR_AS_OUT_ALT1, 105 STR_AS_IN_ALT0, 106 STR_AS_IN_ALT1, 107 }; 108 109 static struct usb_string strings_fn[] = { 110 /* [STR_ASSOC].s = DYNAMIC, */ 111 [STR_IF_CTRL].s = "Topology Control", 112 [STR_CLKSRC_IN].s = "Input Clock", 113 [STR_CLKSRC_OUT].s = "Output Clock", 114 [STR_USB_IT].s = "USBH Out", 115 [STR_IO_IT].s = "USBD Out", 116 [STR_USB_OT].s = "USBH In", 117 [STR_IO_OT].s = "USBD In", 118 [STR_FU_IN].s = "Capture Volume", 119 [STR_FU_OUT].s = "Playback Volume", 120 [STR_AS_OUT_ALT0].s = "Playback Inactive", 121 [STR_AS_OUT_ALT1].s = "Playback Active", 122 [STR_AS_IN_ALT0].s = "Capture Inactive", 123 [STR_AS_IN_ALT1].s = "Capture Active", 124 { }, 125 }; 126 127 static const char *const speed_names[] = { 128 [USB_SPEED_UNKNOWN] = "UNKNOWN", 129 [USB_SPEED_LOW] = "LS", 130 [USB_SPEED_FULL] = "FS", 131 [USB_SPEED_HIGH] = "HS", 132 [USB_SPEED_WIRELESS] = "W", 133 [USB_SPEED_SUPER] = "SS", 134 [USB_SPEED_SUPER_PLUS] = "SS+", 135 }; 136 137 static struct usb_gadget_strings str_fn = { 138 .language = 0x0409, /* en-us */ 139 .strings = strings_fn, 140 }; 141 142 static struct usb_gadget_strings *fn_strings[] = { 143 &str_fn, 144 NULL, 145 }; 146 147 static struct usb_interface_assoc_descriptor iad_desc = { 148 .bLength = sizeof iad_desc, 149 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION, 150 151 .bFirstInterface = 0, 152 .bInterfaceCount = 3, 153 .bFunctionClass = USB_CLASS_AUDIO, 154 .bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED, 155 .bFunctionProtocol = UAC_VERSION_2, 156 }; 157 158 /* Audio Control Interface */ 159 static struct usb_interface_descriptor std_ac_if_desc = { 160 .bLength = sizeof std_ac_if_desc, 161 .bDescriptorType = USB_DT_INTERFACE, 162 163 .bAlternateSetting = 0, 164 /* .bNumEndpoints = DYNAMIC */ 165 .bInterfaceClass = USB_CLASS_AUDIO, 166 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, 167 .bInterfaceProtocol = UAC_VERSION_2, 168 }; 169 170 /* Clock source for IN traffic */ 171 static struct uac_clock_source_descriptor in_clk_src_desc = { 172 .bLength = sizeof in_clk_src_desc, 173 .bDescriptorType = USB_DT_CS_INTERFACE, 174 175 .bDescriptorSubtype = UAC2_CLOCK_SOURCE, 176 /* .bClockID = DYNAMIC */ 177 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED, 178 .bmControls = (CONTROL_RDWR << CLK_FREQ_CTRL), 179 .bAssocTerminal = 0, 180 }; 181 182 /* Clock source for OUT traffic */ 183 static struct uac_clock_source_descriptor out_clk_src_desc = { 184 .bLength = sizeof out_clk_src_desc, 185 .bDescriptorType = USB_DT_CS_INTERFACE, 186 187 .bDescriptorSubtype = UAC2_CLOCK_SOURCE, 188 /* .bClockID = DYNAMIC */ 189 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED, 190 .bmControls = (CONTROL_RDWR << CLK_FREQ_CTRL), 191 .bAssocTerminal = 0, 192 }; 193 194 /* Input Terminal for USB_OUT */ 195 static struct uac2_input_terminal_descriptor usb_out_it_desc = { 196 .bLength = sizeof usb_out_it_desc, 197 .bDescriptorType = USB_DT_CS_INTERFACE, 198 199 .bDescriptorSubtype = UAC_INPUT_TERMINAL, 200 /* .bTerminalID = DYNAMIC */ 201 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING), 202 .bAssocTerminal = 0, 203 /* .bCSourceID = DYNAMIC */ 204 .iChannelNames = 0, 205 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL), 206 }; 207 208 /* Input Terminal for I/O-In */ 209 static struct uac2_input_terminal_descriptor io_in_it_desc = { 210 .bLength = sizeof io_in_it_desc, 211 .bDescriptorType = USB_DT_CS_INTERFACE, 212 213 .bDescriptorSubtype = UAC_INPUT_TERMINAL, 214 /* .bTerminalID = DYNAMIC */ 215 /* .wTerminalType = DYNAMIC */ 216 .bAssocTerminal = 0, 217 /* .bCSourceID = DYNAMIC */ 218 .iChannelNames = 0, 219 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL), 220 }; 221 222 /* Ouput Terminal for USB_IN */ 223 static struct uac2_output_terminal_descriptor usb_in_ot_desc = { 224 .bLength = sizeof usb_in_ot_desc, 225 .bDescriptorType = USB_DT_CS_INTERFACE, 226 227 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, 228 /* .bTerminalID = DYNAMIC */ 229 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING), 230 .bAssocTerminal = 0, 231 /* .bSourceID = DYNAMIC */ 232 /* .bCSourceID = DYNAMIC */ 233 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL), 234 }; 235 236 /* Ouput Terminal for I/O-Out */ 237 static struct uac2_output_terminal_descriptor io_out_ot_desc = { 238 .bLength = sizeof io_out_ot_desc, 239 .bDescriptorType = USB_DT_CS_INTERFACE, 240 241 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, 242 /* .bTerminalID = DYNAMIC */ 243 /* .wTerminalType = DYNAMIC */ 244 .bAssocTerminal = 0, 245 /* .bSourceID = DYNAMIC */ 246 /* .bCSourceID = DYNAMIC */ 247 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL), 248 }; 249 250 static struct uac2_feature_unit_descriptor *in_feature_unit_desc; 251 static struct uac2_feature_unit_descriptor *out_feature_unit_desc; 252 253 static struct uac2_ac_header_descriptor ac_hdr_desc = { 254 .bLength = sizeof ac_hdr_desc, 255 .bDescriptorType = USB_DT_CS_INTERFACE, 256 257 .bDescriptorSubtype = UAC_MS_HEADER, 258 .bcdADC = cpu_to_le16(0x200), 259 .bCategory = UAC2_FUNCTION_IO_BOX, 260 /* .wTotalLength = DYNAMIC */ 261 .bmControls = 0, 262 }; 263 264 /* AC IN Interrupt Endpoint */ 265 static struct usb_endpoint_descriptor fs_ep_int_desc = { 266 .bLength = USB_DT_ENDPOINT_SIZE, 267 .bDescriptorType = USB_DT_ENDPOINT, 268 269 .bEndpointAddress = USB_DIR_IN, 270 .bmAttributes = USB_ENDPOINT_XFER_INT, 271 .wMaxPacketSize = cpu_to_le16(6), 272 .bInterval = 1, 273 }; 274 275 static struct usb_endpoint_descriptor hs_ep_int_desc = { 276 .bLength = USB_DT_ENDPOINT_SIZE, 277 .bDescriptorType = USB_DT_ENDPOINT, 278 279 .bmAttributes = USB_ENDPOINT_XFER_INT, 280 .wMaxPacketSize = cpu_to_le16(6), 281 .bInterval = 4, 282 }; 283 284 static struct usb_endpoint_descriptor ss_ep_int_desc = { 285 .bLength = USB_DT_ENDPOINT_SIZE, 286 .bDescriptorType = USB_DT_ENDPOINT, 287 288 .bEndpointAddress = USB_DIR_IN, 289 .bmAttributes = USB_ENDPOINT_XFER_INT, 290 .wMaxPacketSize = cpu_to_le16(6), 291 .bInterval = 4, 292 }; 293 294 static struct usb_ss_ep_comp_descriptor ss_ep_int_desc_comp = { 295 .bLength = sizeof(ss_ep_int_desc_comp), 296 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 297 .wBytesPerInterval = cpu_to_le16(6), 298 }; 299 300 /* Audio Streaming OUT Interface - Alt0 */ 301 static struct usb_interface_descriptor std_as_out_if0_desc = { 302 .bLength = sizeof std_as_out_if0_desc, 303 .bDescriptorType = USB_DT_INTERFACE, 304 305 .bAlternateSetting = 0, 306 .bNumEndpoints = 0, 307 .bInterfaceClass = USB_CLASS_AUDIO, 308 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 309 .bInterfaceProtocol = UAC_VERSION_2, 310 }; 311 312 /* Audio Streaming OUT Interface - Alt1 */ 313 static struct usb_interface_descriptor std_as_out_if1_desc = { 314 .bLength = sizeof std_as_out_if1_desc, 315 .bDescriptorType = USB_DT_INTERFACE, 316 317 .bAlternateSetting = 1, 318 .bNumEndpoints = 1, 319 .bInterfaceClass = USB_CLASS_AUDIO, 320 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 321 .bInterfaceProtocol = UAC_VERSION_2, 322 }; 323 324 /* Audio Stream OUT Intface Desc */ 325 static struct uac2_as_header_descriptor as_out_hdr_desc = { 326 .bLength = sizeof as_out_hdr_desc, 327 .bDescriptorType = USB_DT_CS_INTERFACE, 328 329 .bDescriptorSubtype = UAC_AS_GENERAL, 330 /* .bTerminalLink = DYNAMIC */ 331 .bmControls = 0, 332 .bFormatType = UAC_FORMAT_TYPE_I, 333 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM), 334 .iChannelNames = 0, 335 }; 336 337 /* Audio USB_OUT Format */ 338 static struct uac2_format_type_i_descriptor as_out_fmt1_desc = { 339 .bLength = sizeof as_out_fmt1_desc, 340 .bDescriptorType = USB_DT_CS_INTERFACE, 341 .bDescriptorSubtype = UAC_FORMAT_TYPE, 342 .bFormatType = UAC_FORMAT_TYPE_I, 343 }; 344 345 /* STD AS ISO OUT Endpoint */ 346 static struct usb_endpoint_descriptor fs_epout_desc = { 347 .bLength = USB_DT_ENDPOINT_SIZE, 348 .bDescriptorType = USB_DT_ENDPOINT, 349 350 .bEndpointAddress = USB_DIR_OUT, 351 /* .bmAttributes = DYNAMIC */ 352 /* .wMaxPacketSize = DYNAMIC */ 353 .bInterval = 1, 354 }; 355 356 static struct usb_endpoint_descriptor hs_epout_desc = { 357 .bLength = USB_DT_ENDPOINT_SIZE, 358 .bDescriptorType = USB_DT_ENDPOINT, 359 360 /* .bmAttributes = DYNAMIC */ 361 /* .wMaxPacketSize = DYNAMIC */ 362 /* .bInterval = DYNAMIC */ 363 }; 364 365 static struct usb_endpoint_descriptor ss_epout_desc = { 366 .bLength = USB_DT_ENDPOINT_SIZE, 367 .bDescriptorType = USB_DT_ENDPOINT, 368 369 .bEndpointAddress = USB_DIR_OUT, 370 /* .bmAttributes = DYNAMIC */ 371 /* .wMaxPacketSize = DYNAMIC */ 372 /* .bInterval = DYNAMIC */ 373 }; 374 375 static struct usb_ss_ep_comp_descriptor ss_epout_desc_comp = { 376 .bLength = sizeof(ss_epout_desc_comp), 377 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 378 .bMaxBurst = 0, 379 .bmAttributes = 0, 380 /* wBytesPerInterval = DYNAMIC */ 381 }; 382 383 /* CS AS ISO OUT Endpoint */ 384 static struct uac2_iso_endpoint_descriptor as_iso_out_desc = { 385 .bLength = sizeof as_iso_out_desc, 386 .bDescriptorType = USB_DT_CS_ENDPOINT, 387 388 .bDescriptorSubtype = UAC_EP_GENERAL, 389 .bmAttributes = 0, 390 .bmControls = 0, 391 .bLockDelayUnits = 0, 392 .wLockDelay = 0, 393 }; 394 395 /* STD AS ISO IN Feedback Endpoint */ 396 static struct usb_endpoint_descriptor fs_epin_fback_desc = { 397 .bLength = USB_DT_ENDPOINT_SIZE, 398 .bDescriptorType = USB_DT_ENDPOINT, 399 400 .bEndpointAddress = USB_DIR_IN, 401 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK, 402 .wMaxPacketSize = cpu_to_le16(3), 403 .bInterval = 1, 404 }; 405 406 static struct usb_endpoint_descriptor hs_epin_fback_desc = { 407 .bLength = USB_DT_ENDPOINT_SIZE, 408 .bDescriptorType = USB_DT_ENDPOINT, 409 410 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK, 411 .wMaxPacketSize = cpu_to_le16(4), 412 .bInterval = 4, 413 }; 414 415 static struct usb_endpoint_descriptor ss_epin_fback_desc = { 416 .bLength = USB_DT_ENDPOINT_SIZE, 417 .bDescriptorType = USB_DT_ENDPOINT, 418 419 .bEndpointAddress = USB_DIR_IN, 420 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK, 421 .wMaxPacketSize = cpu_to_le16(4), 422 .bInterval = 4, 423 }; 424 425 static struct usb_ss_ep_comp_descriptor ss_epin_fback_desc_comp = { 426 .bLength = sizeof(ss_epin_fback_desc_comp), 427 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 428 .bMaxBurst = 0, 429 .bmAttributes = 0, 430 .wBytesPerInterval = cpu_to_le16(4), 431 }; 432 433 434 /* Audio Streaming IN Interface - Alt0 */ 435 static struct usb_interface_descriptor std_as_in_if0_desc = { 436 .bLength = sizeof std_as_in_if0_desc, 437 .bDescriptorType = USB_DT_INTERFACE, 438 439 .bAlternateSetting = 0, 440 .bNumEndpoints = 0, 441 .bInterfaceClass = USB_CLASS_AUDIO, 442 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 443 .bInterfaceProtocol = UAC_VERSION_2, 444 }; 445 446 /* Audio Streaming IN Interface - Alt1 */ 447 static struct usb_interface_descriptor std_as_in_if1_desc = { 448 .bLength = sizeof std_as_in_if1_desc, 449 .bDescriptorType = USB_DT_INTERFACE, 450 451 .bAlternateSetting = 1, 452 .bNumEndpoints = 1, 453 .bInterfaceClass = USB_CLASS_AUDIO, 454 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 455 .bInterfaceProtocol = UAC_VERSION_2, 456 }; 457 458 /* Audio Stream IN Intface Desc */ 459 static struct uac2_as_header_descriptor as_in_hdr_desc = { 460 .bLength = sizeof as_in_hdr_desc, 461 .bDescriptorType = USB_DT_CS_INTERFACE, 462 463 .bDescriptorSubtype = UAC_AS_GENERAL, 464 /* .bTerminalLink = DYNAMIC */ 465 .bmControls = 0, 466 .bFormatType = UAC_FORMAT_TYPE_I, 467 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM), 468 .iChannelNames = 0, 469 }; 470 471 /* Audio USB_IN Format */ 472 static struct uac2_format_type_i_descriptor as_in_fmt1_desc = { 473 .bLength = sizeof as_in_fmt1_desc, 474 .bDescriptorType = USB_DT_CS_INTERFACE, 475 .bDescriptorSubtype = UAC_FORMAT_TYPE, 476 .bFormatType = UAC_FORMAT_TYPE_I, 477 }; 478 479 /* STD AS ISO IN Endpoint */ 480 static struct usb_endpoint_descriptor fs_epin_desc = { 481 .bLength = USB_DT_ENDPOINT_SIZE, 482 .bDescriptorType = USB_DT_ENDPOINT, 483 484 .bEndpointAddress = USB_DIR_IN, 485 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 486 /* .wMaxPacketSize = DYNAMIC */ 487 .bInterval = 1, 488 }; 489 490 static struct usb_endpoint_descriptor hs_epin_desc = { 491 .bLength = USB_DT_ENDPOINT_SIZE, 492 .bDescriptorType = USB_DT_ENDPOINT, 493 494 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 495 /* .wMaxPacketSize = DYNAMIC */ 496 /* .bInterval = DYNAMIC */ 497 }; 498 499 static struct usb_endpoint_descriptor ss_epin_desc = { 500 .bLength = USB_DT_ENDPOINT_SIZE, 501 .bDescriptorType = USB_DT_ENDPOINT, 502 503 .bEndpointAddress = USB_DIR_IN, 504 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 505 /* .wMaxPacketSize = DYNAMIC */ 506 /* .bInterval = DYNAMIC */ 507 }; 508 509 static struct usb_ss_ep_comp_descriptor ss_epin_desc_comp = { 510 .bLength = sizeof(ss_epin_desc_comp), 511 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 512 .bMaxBurst = 0, 513 .bmAttributes = 0, 514 /* wBytesPerInterval = DYNAMIC */ 515 }; 516 517 /* CS AS ISO IN Endpoint */ 518 static struct uac2_iso_endpoint_descriptor as_iso_in_desc = { 519 .bLength = sizeof as_iso_in_desc, 520 .bDescriptorType = USB_DT_CS_ENDPOINT, 521 522 .bDescriptorSubtype = UAC_EP_GENERAL, 523 .bmAttributes = 0, 524 .bmControls = 0, 525 .bLockDelayUnits = 0, 526 .wLockDelay = 0, 527 }; 528 529 static struct usb_descriptor_header *fs_audio_desc[] = { 530 (struct usb_descriptor_header *)&iad_desc, 531 (struct usb_descriptor_header *)&std_ac_if_desc, 532 533 (struct usb_descriptor_header *)&ac_hdr_desc, 534 (struct usb_descriptor_header *)&in_clk_src_desc, 535 (struct usb_descriptor_header *)&out_clk_src_desc, 536 (struct usb_descriptor_header *)&usb_out_it_desc, 537 (struct usb_descriptor_header *)&out_feature_unit_desc, 538 (struct usb_descriptor_header *)&io_in_it_desc, 539 (struct usb_descriptor_header *)&usb_in_ot_desc, 540 (struct usb_descriptor_header *)&in_feature_unit_desc, 541 (struct usb_descriptor_header *)&io_out_ot_desc, 542 543 (struct usb_descriptor_header *)&fs_ep_int_desc, 544 545 (struct usb_descriptor_header *)&std_as_out_if0_desc, 546 (struct usb_descriptor_header *)&std_as_out_if1_desc, 547 548 (struct usb_descriptor_header *)&as_out_hdr_desc, 549 (struct usb_descriptor_header *)&as_out_fmt1_desc, 550 (struct usb_descriptor_header *)&fs_epout_desc, 551 (struct usb_descriptor_header *)&as_iso_out_desc, 552 (struct usb_descriptor_header *)&fs_epin_fback_desc, 553 554 (struct usb_descriptor_header *)&std_as_in_if0_desc, 555 (struct usb_descriptor_header *)&std_as_in_if1_desc, 556 557 (struct usb_descriptor_header *)&as_in_hdr_desc, 558 (struct usb_descriptor_header *)&as_in_fmt1_desc, 559 (struct usb_descriptor_header *)&fs_epin_desc, 560 (struct usb_descriptor_header *)&as_iso_in_desc, 561 NULL, 562 }; 563 564 static struct usb_descriptor_header *hs_audio_desc[] = { 565 (struct usb_descriptor_header *)&iad_desc, 566 (struct usb_descriptor_header *)&std_ac_if_desc, 567 568 (struct usb_descriptor_header *)&ac_hdr_desc, 569 (struct usb_descriptor_header *)&in_clk_src_desc, 570 (struct usb_descriptor_header *)&out_clk_src_desc, 571 (struct usb_descriptor_header *)&usb_out_it_desc, 572 (struct usb_descriptor_header *)&out_feature_unit_desc, 573 (struct usb_descriptor_header *)&io_in_it_desc, 574 (struct usb_descriptor_header *)&usb_in_ot_desc, 575 (struct usb_descriptor_header *)&in_feature_unit_desc, 576 (struct usb_descriptor_header *)&io_out_ot_desc, 577 578 (struct usb_descriptor_header *)&hs_ep_int_desc, 579 580 (struct usb_descriptor_header *)&std_as_out_if0_desc, 581 (struct usb_descriptor_header *)&std_as_out_if1_desc, 582 583 (struct usb_descriptor_header *)&as_out_hdr_desc, 584 (struct usb_descriptor_header *)&as_out_fmt1_desc, 585 (struct usb_descriptor_header *)&hs_epout_desc, 586 (struct usb_descriptor_header *)&as_iso_out_desc, 587 (struct usb_descriptor_header *)&hs_epin_fback_desc, 588 589 (struct usb_descriptor_header *)&std_as_in_if0_desc, 590 (struct usb_descriptor_header *)&std_as_in_if1_desc, 591 592 (struct usb_descriptor_header *)&as_in_hdr_desc, 593 (struct usb_descriptor_header *)&as_in_fmt1_desc, 594 (struct usb_descriptor_header *)&hs_epin_desc, 595 (struct usb_descriptor_header *)&as_iso_in_desc, 596 NULL, 597 }; 598 599 static struct usb_descriptor_header *ss_audio_desc[] = { 600 (struct usb_descriptor_header *)&iad_desc, 601 (struct usb_descriptor_header *)&std_ac_if_desc, 602 603 (struct usb_descriptor_header *)&ac_hdr_desc, 604 (struct usb_descriptor_header *)&in_clk_src_desc, 605 (struct usb_descriptor_header *)&out_clk_src_desc, 606 (struct usb_descriptor_header *)&usb_out_it_desc, 607 (struct usb_descriptor_header *)&out_feature_unit_desc, 608 (struct usb_descriptor_header *)&io_in_it_desc, 609 (struct usb_descriptor_header *)&usb_in_ot_desc, 610 (struct usb_descriptor_header *)&in_feature_unit_desc, 611 (struct usb_descriptor_header *)&io_out_ot_desc, 612 613 (struct usb_descriptor_header *)&ss_ep_int_desc, 614 (struct usb_descriptor_header *)&ss_ep_int_desc_comp, 615 616 (struct usb_descriptor_header *)&std_as_out_if0_desc, 617 (struct usb_descriptor_header *)&std_as_out_if1_desc, 618 619 (struct usb_descriptor_header *)&as_out_hdr_desc, 620 (struct usb_descriptor_header *)&as_out_fmt1_desc, 621 (struct usb_descriptor_header *)&ss_epout_desc, 622 (struct usb_descriptor_header *)&ss_epout_desc_comp, 623 (struct usb_descriptor_header *)&as_iso_out_desc, 624 (struct usb_descriptor_header *)&ss_epin_fback_desc, 625 (struct usb_descriptor_header *)&ss_epin_fback_desc_comp, 626 627 (struct usb_descriptor_header *)&std_as_in_if0_desc, 628 (struct usb_descriptor_header *)&std_as_in_if1_desc, 629 630 (struct usb_descriptor_header *)&as_in_hdr_desc, 631 (struct usb_descriptor_header *)&as_in_fmt1_desc, 632 (struct usb_descriptor_header *)&ss_epin_desc, 633 (struct usb_descriptor_header *)&ss_epin_desc_comp, 634 (struct usb_descriptor_header *)&as_iso_in_desc, 635 NULL, 636 }; 637 638 struct cntrl_cur_lay2 { 639 __le16 wCUR; 640 }; 641 642 struct cntrl_range_lay2 { 643 __le16 wNumSubRanges; 644 __le16 wMIN; 645 __le16 wMAX; 646 __le16 wRES; 647 } __packed; 648 649 struct cntrl_cur_lay3 { 650 __le32 dCUR; 651 }; 652 653 struct cntrl_subrange_lay3 { 654 __le32 dMIN; 655 __le32 dMAX; 656 __le32 dRES; 657 } __packed; 658 659 #define ranges_lay3_size(c) (sizeof(c.wNumSubRanges) \ 660 + le16_to_cpu(c.wNumSubRanges) \ 661 * sizeof(struct cntrl_subrange_lay3)) 662 663 #define DECLARE_UAC2_CNTRL_RANGES_LAY3(k, n) \ 664 struct cntrl_ranges_lay3_##k { \ 665 __le16 wNumSubRanges; \ 666 struct cntrl_subrange_lay3 r[n]; \ 667 } __packed 668 669 DECLARE_UAC2_CNTRL_RANGES_LAY3(srates, UAC_MAX_RATES); 670 671 static int get_max_srate(const int *srates) 672 { 673 int i, max_srate = 0; 674 675 for (i = 0; i < UAC_MAX_RATES; i++) { 676 if (srates[i] == 0) 677 break; 678 if (srates[i] > max_srate) 679 max_srate = srates[i]; 680 } 681 return max_srate; 682 } 683 684 static int get_max_bw_for_bint(const struct f_uac2_opts *uac2_opts, 685 u8 bint, unsigned int factor, bool is_playback) 686 { 687 int chmask, srate, ssize; 688 u16 max_size_bw; 689 690 if (is_playback) { 691 chmask = uac2_opts->p_chmask; 692 srate = get_max_srate(uac2_opts->p_srates); 693 ssize = uac2_opts->p_ssize; 694 } else { 695 chmask = uac2_opts->c_chmask; 696 srate = get_max_srate(uac2_opts->c_srates); 697 ssize = uac2_opts->c_ssize; 698 } 699 700 if (is_playback || (uac2_opts->c_sync == USB_ENDPOINT_SYNC_ASYNC)) { 701 // playback is always async, capture only when configured 702 // Win10 requires max packet size + 1 frame 703 srate = srate * (1000 + uac2_opts->fb_max) / 1000; 704 // updated srate is always bigger, therefore DIV_ROUND_UP always yields +1 705 max_size_bw = num_channels(chmask) * ssize * 706 (DIV_ROUND_UP(srate, factor / (1 << (bint - 1)))); 707 } else { 708 // adding 1 frame provision for Win10 709 max_size_bw = num_channels(chmask) * ssize * 710 (DIV_ROUND_UP(srate, factor / (1 << (bint - 1))) + 1); 711 } 712 return max_size_bw; 713 } 714 715 static int set_ep_max_packet_size_bint(struct device *dev, const struct f_uac2_opts *uac2_opts, 716 struct usb_endpoint_descriptor *ep_desc, 717 enum usb_device_speed speed, bool is_playback) 718 { 719 u16 max_size_bw, max_size_ep; 720 u8 bint, opts_bint; 721 char *dir; 722 723 switch (speed) { 724 case USB_SPEED_FULL: 725 max_size_ep = 1023; 726 // fixed 727 bint = ep_desc->bInterval; 728 max_size_bw = get_max_bw_for_bint(uac2_opts, bint, 1000, is_playback); 729 break; 730 731 case USB_SPEED_HIGH: 732 case USB_SPEED_SUPER: 733 max_size_ep = 1024; 734 if (is_playback) 735 opts_bint = uac2_opts->p_hs_bint; 736 else 737 opts_bint = uac2_opts->c_hs_bint; 738 739 if (opts_bint > 0) { 740 /* fixed bint */ 741 bint = opts_bint; 742 max_size_bw = get_max_bw_for_bint(uac2_opts, bint, 8000, is_playback); 743 } else { 744 /* checking bInterval from 4 to 1 whether the required bandwidth fits */ 745 for (bint = 4; bint > 0; --bint) { 746 max_size_bw = get_max_bw_for_bint( 747 uac2_opts, bint, 8000, is_playback); 748 if (max_size_bw <= max_size_ep) 749 break; 750 } 751 } 752 break; 753 754 default: 755 return -EINVAL; 756 } 757 758 if (is_playback) 759 dir = "Playback"; 760 else 761 dir = "Capture"; 762 763 if (max_size_bw <= max_size_ep) 764 dev_dbg(dev, 765 "%s %s: Would use wMaxPacketSize %d and bInterval %d\n", 766 speed_names[speed], dir, max_size_bw, bint); 767 else { 768 dev_warn(dev, 769 "%s %s: Req. wMaxPacketSize %d at bInterval %d > max ISOC %d, may drop data!\n", 770 speed_names[speed], dir, max_size_bw, bint, max_size_ep); 771 max_size_bw = max_size_ep; 772 } 773 774 ep_desc->wMaxPacketSize = cpu_to_le16(max_size_bw); 775 ep_desc->bInterval = bint; 776 777 return 0; 778 } 779 780 static struct uac2_feature_unit_descriptor *build_fu_desc(int chmask) 781 { 782 struct uac2_feature_unit_descriptor *fu_desc; 783 int channels = num_channels(chmask); 784 int fu_desc_size = UAC2_DT_FEATURE_UNIT_SIZE(channels); 785 786 fu_desc = kzalloc(fu_desc_size, GFP_KERNEL); 787 if (!fu_desc) 788 return NULL; 789 790 fu_desc->bLength = fu_desc_size; 791 fu_desc->bDescriptorType = USB_DT_CS_INTERFACE; 792 793 fu_desc->bDescriptorSubtype = UAC_FEATURE_UNIT; 794 795 /* bUnitID, bSourceID and bmaControls will be defined later */ 796 797 return fu_desc; 798 } 799 800 /* Use macro to overcome line length limitation */ 801 #define USBDHDR(p) (struct usb_descriptor_header *)(p) 802 803 static void setup_headers(struct f_uac2_opts *opts, 804 struct usb_descriptor_header **headers, 805 enum usb_device_speed speed) 806 { 807 struct usb_ss_ep_comp_descriptor *epout_desc_comp = NULL; 808 struct usb_ss_ep_comp_descriptor *epin_desc_comp = NULL; 809 struct usb_ss_ep_comp_descriptor *epin_fback_desc_comp = NULL; 810 struct usb_ss_ep_comp_descriptor *ep_int_desc_comp = NULL; 811 struct usb_endpoint_descriptor *epout_desc; 812 struct usb_endpoint_descriptor *epin_desc; 813 struct usb_endpoint_descriptor *epin_fback_desc; 814 struct usb_endpoint_descriptor *ep_int_desc; 815 int i; 816 817 switch (speed) { 818 case USB_SPEED_FULL: 819 epout_desc = &fs_epout_desc; 820 epin_desc = &fs_epin_desc; 821 epin_fback_desc = &fs_epin_fback_desc; 822 ep_int_desc = &fs_ep_int_desc; 823 break; 824 case USB_SPEED_HIGH: 825 epout_desc = &hs_epout_desc; 826 epin_desc = &hs_epin_desc; 827 epin_fback_desc = &hs_epin_fback_desc; 828 ep_int_desc = &hs_ep_int_desc; 829 break; 830 default: 831 epout_desc = &ss_epout_desc; 832 epin_desc = &ss_epin_desc; 833 epout_desc_comp = &ss_epout_desc_comp; 834 epin_desc_comp = &ss_epin_desc_comp; 835 epin_fback_desc = &ss_epin_fback_desc; 836 epin_fback_desc_comp = &ss_epin_fback_desc_comp; 837 ep_int_desc = &ss_ep_int_desc; 838 ep_int_desc_comp = &ss_ep_int_desc_comp; 839 } 840 841 i = 0; 842 headers[i++] = USBDHDR(&iad_desc); 843 headers[i++] = USBDHDR(&std_ac_if_desc); 844 headers[i++] = USBDHDR(&ac_hdr_desc); 845 if (EPIN_EN(opts)) 846 headers[i++] = USBDHDR(&in_clk_src_desc); 847 if (EPOUT_EN(opts)) { 848 headers[i++] = USBDHDR(&out_clk_src_desc); 849 headers[i++] = USBDHDR(&usb_out_it_desc); 850 851 if (FUOUT_EN(opts)) 852 headers[i++] = USBDHDR(out_feature_unit_desc); 853 } 854 855 if (EPIN_EN(opts)) { 856 headers[i++] = USBDHDR(&io_in_it_desc); 857 858 if (FUIN_EN(opts)) 859 headers[i++] = USBDHDR(in_feature_unit_desc); 860 861 headers[i++] = USBDHDR(&usb_in_ot_desc); 862 } 863 864 if (EPOUT_EN(opts)) 865 headers[i++] = USBDHDR(&io_out_ot_desc); 866 867 if (FUOUT_EN(opts) || FUIN_EN(opts)) { 868 headers[i++] = USBDHDR(ep_int_desc); 869 if (ep_int_desc_comp) 870 headers[i++] = USBDHDR(ep_int_desc_comp); 871 } 872 873 if (EPOUT_EN(opts)) { 874 headers[i++] = USBDHDR(&std_as_out_if0_desc); 875 headers[i++] = USBDHDR(&std_as_out_if1_desc); 876 headers[i++] = USBDHDR(&as_out_hdr_desc); 877 headers[i++] = USBDHDR(&as_out_fmt1_desc); 878 headers[i++] = USBDHDR(epout_desc); 879 if (epout_desc_comp) 880 headers[i++] = USBDHDR(epout_desc_comp); 881 882 headers[i++] = USBDHDR(&as_iso_out_desc); 883 884 if (EPOUT_FBACK_IN_EN(opts)) { 885 headers[i++] = USBDHDR(epin_fback_desc); 886 if (epin_fback_desc_comp) 887 headers[i++] = USBDHDR(epin_fback_desc_comp); 888 } 889 } 890 891 if (EPIN_EN(opts)) { 892 headers[i++] = USBDHDR(&std_as_in_if0_desc); 893 headers[i++] = USBDHDR(&std_as_in_if1_desc); 894 headers[i++] = USBDHDR(&as_in_hdr_desc); 895 headers[i++] = USBDHDR(&as_in_fmt1_desc); 896 headers[i++] = USBDHDR(epin_desc); 897 if (epin_desc_comp) 898 headers[i++] = USBDHDR(epin_desc_comp); 899 900 headers[i++] = USBDHDR(&as_iso_in_desc); 901 } 902 headers[i] = NULL; 903 } 904 905 static void setup_descriptor(struct f_uac2_opts *opts) 906 { 907 /* patch descriptors */ 908 int i = 1; /* ID's start with 1 */ 909 910 if (EPOUT_EN(opts)) 911 usb_out_it_desc.bTerminalID = i++; 912 if (EPIN_EN(opts)) 913 io_in_it_desc.bTerminalID = i++; 914 if (EPOUT_EN(opts)) 915 io_out_ot_desc.bTerminalID = i++; 916 if (EPIN_EN(opts)) 917 usb_in_ot_desc.bTerminalID = i++; 918 if (FUOUT_EN(opts)) 919 out_feature_unit_desc->bUnitID = i++; 920 if (FUIN_EN(opts)) 921 in_feature_unit_desc->bUnitID = i++; 922 if (EPOUT_EN(opts)) 923 out_clk_src_desc.bClockID = i++; 924 if (EPIN_EN(opts)) 925 in_clk_src_desc.bClockID = i++; 926 927 usb_out_it_desc.bCSourceID = out_clk_src_desc.bClockID; 928 929 if (FUIN_EN(opts)) { 930 usb_in_ot_desc.bSourceID = in_feature_unit_desc->bUnitID; 931 in_feature_unit_desc->bSourceID = io_in_it_desc.bTerminalID; 932 } else { 933 usb_in_ot_desc.bSourceID = io_in_it_desc.bTerminalID; 934 } 935 936 usb_in_ot_desc.bCSourceID = in_clk_src_desc.bClockID; 937 io_in_it_desc.bCSourceID = in_clk_src_desc.bClockID; 938 io_out_ot_desc.bCSourceID = out_clk_src_desc.bClockID; 939 940 if (FUOUT_EN(opts)) { 941 io_out_ot_desc.bSourceID = out_feature_unit_desc->bUnitID; 942 out_feature_unit_desc->bSourceID = usb_out_it_desc.bTerminalID; 943 } else { 944 io_out_ot_desc.bSourceID = usb_out_it_desc.bTerminalID; 945 } 946 947 as_out_hdr_desc.bTerminalLink = usb_out_it_desc.bTerminalID; 948 as_in_hdr_desc.bTerminalLink = usb_in_ot_desc.bTerminalID; 949 950 iad_desc.bInterfaceCount = 1; 951 ac_hdr_desc.wTotalLength = cpu_to_le16(sizeof(ac_hdr_desc)); 952 953 if (EPIN_EN(opts)) { 954 u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength); 955 956 len += sizeof(in_clk_src_desc); 957 len += sizeof(usb_in_ot_desc); 958 959 if (FUIN_EN(opts)) 960 len += in_feature_unit_desc->bLength; 961 962 len += sizeof(io_in_it_desc); 963 ac_hdr_desc.wTotalLength = cpu_to_le16(len); 964 iad_desc.bInterfaceCount++; 965 } 966 if (EPOUT_EN(opts)) { 967 u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength); 968 969 len += sizeof(out_clk_src_desc); 970 len += sizeof(usb_out_it_desc); 971 972 if (FUOUT_EN(opts)) 973 len += out_feature_unit_desc->bLength; 974 975 len += sizeof(io_out_ot_desc); 976 ac_hdr_desc.wTotalLength = cpu_to_le16(len); 977 iad_desc.bInterfaceCount++; 978 } 979 980 io_in_it_desc.wTerminalType = cpu_to_le16(opts->c_terminal_type); 981 io_out_ot_desc.wTerminalType = cpu_to_le16(opts->p_terminal_type); 982 983 setup_headers(opts, fs_audio_desc, USB_SPEED_FULL); 984 setup_headers(opts, hs_audio_desc, USB_SPEED_HIGH); 985 setup_headers(opts, ss_audio_desc, USB_SPEED_SUPER); 986 } 987 988 static int afunc_validate_opts(struct g_audio *agdev, struct device *dev) 989 { 990 struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev); 991 const char *msg = NULL; 992 993 if (!opts->p_chmask && !opts->c_chmask) 994 msg = "no playback and capture channels"; 995 else if (opts->p_chmask & ~UAC2_CHANNEL_MASK) 996 msg = "unsupported playback channels mask"; 997 else if (opts->c_chmask & ~UAC2_CHANNEL_MASK) 998 msg = "unsupported capture channels mask"; 999 else if ((opts->p_ssize < 1) || (opts->p_ssize > 4)) 1000 msg = "incorrect playback sample size"; 1001 else if ((opts->c_ssize < 1) || (opts->c_ssize > 4)) 1002 msg = "incorrect capture sample size"; 1003 else if (!opts->p_srates[0]) 1004 msg = "incorrect playback sampling rate"; 1005 else if (!opts->c_srates[0]) 1006 msg = "incorrect capture sampling rate"; 1007 1008 else if (opts->p_volume_max <= opts->p_volume_min) 1009 msg = "incorrect playback volume max/min"; 1010 else if (opts->c_volume_max <= opts->c_volume_min) 1011 msg = "incorrect capture volume max/min"; 1012 else if (opts->p_volume_res <= 0) 1013 msg = "negative/zero playback volume resolution"; 1014 else if (opts->c_volume_res <= 0) 1015 msg = "negative/zero capture volume resolution"; 1016 1017 else if ((opts->p_volume_max - opts->p_volume_min) % opts->p_volume_res) 1018 msg = "incorrect playback volume resolution"; 1019 else if ((opts->c_volume_max - opts->c_volume_min) % opts->c_volume_res) 1020 msg = "incorrect capture volume resolution"; 1021 1022 else if ((opts->p_hs_bint < 0) || (opts->p_hs_bint > 4)) 1023 msg = "incorrect playback HS/SS bInterval (1-4: fixed, 0: auto)"; 1024 else if ((opts->c_hs_bint < 0) || (opts->c_hs_bint > 4)) 1025 msg = "incorrect capture HS/SS bInterval (1-4: fixed, 0: auto)"; 1026 1027 if (msg) { 1028 dev_err(dev, "Error: %s\n", msg); 1029 return -EINVAL; 1030 } 1031 1032 return 0; 1033 } 1034 1035 static int 1036 afunc_bind(struct usb_configuration *cfg, struct usb_function *fn) 1037 { 1038 struct f_uac2 *uac2 = func_to_uac2(fn); 1039 struct g_audio *agdev = func_to_g_audio(fn); 1040 struct usb_composite_dev *cdev = cfg->cdev; 1041 struct usb_gadget *gadget = cdev->gadget; 1042 struct device *dev = &gadget->dev; 1043 struct f_uac2_opts *uac2_opts = g_audio_to_uac2_opts(agdev); 1044 struct usb_string *us; 1045 int ret; 1046 1047 ret = afunc_validate_opts(agdev, dev); 1048 if (ret) 1049 return ret; 1050 1051 strings_fn[STR_ASSOC].s = uac2_opts->function_name; 1052 1053 us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn)); 1054 if (IS_ERR(us)) 1055 return PTR_ERR(us); 1056 1057 if (FUOUT_EN(uac2_opts)) { 1058 out_feature_unit_desc = build_fu_desc(uac2_opts->c_chmask); 1059 if (!out_feature_unit_desc) 1060 return -ENOMEM; 1061 } 1062 if (FUIN_EN(uac2_opts)) { 1063 in_feature_unit_desc = build_fu_desc(uac2_opts->p_chmask); 1064 if (!in_feature_unit_desc) { 1065 ret = -ENOMEM; 1066 goto err_free_fu; 1067 } 1068 } 1069 1070 iad_desc.iFunction = us[STR_ASSOC].id; 1071 std_ac_if_desc.iInterface = us[STR_IF_CTRL].id; 1072 in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id; 1073 out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id; 1074 usb_out_it_desc.iTerminal = us[STR_USB_IT].id; 1075 io_in_it_desc.iTerminal = us[STR_IO_IT].id; 1076 usb_in_ot_desc.iTerminal = us[STR_USB_OT].id; 1077 io_out_ot_desc.iTerminal = us[STR_IO_OT].id; 1078 std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id; 1079 std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id; 1080 std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id; 1081 std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id; 1082 1083 if (FUOUT_EN(uac2_opts)) { 1084 u8 *i_feature = (u8 *)out_feature_unit_desc + 1085 out_feature_unit_desc->bLength - 1; 1086 *i_feature = us[STR_FU_OUT].id; 1087 } 1088 if (FUIN_EN(uac2_opts)) { 1089 u8 *i_feature = (u8 *)in_feature_unit_desc + 1090 in_feature_unit_desc->bLength - 1; 1091 *i_feature = us[STR_FU_IN].id; 1092 } 1093 1094 1095 /* Initialize the configurable parameters */ 1096 usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask); 1097 usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask); 1098 io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask); 1099 io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask); 1100 as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask); 1101 as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask); 1102 as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask); 1103 as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask); 1104 as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize; 1105 as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8; 1106 as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize; 1107 as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8; 1108 if (FUOUT_EN(uac2_opts)) { 1109 __le32 *bma = (__le32 *)&out_feature_unit_desc->bmaControls[0]; 1110 u32 control = 0; 1111 1112 if (uac2_opts->c_mute_present) 1113 control |= CONTROL_RDWR << FU_MUTE_CTRL; 1114 if (uac2_opts->c_volume_present) 1115 control |= CONTROL_RDWR << FU_VOL_CTRL; 1116 *bma = cpu_to_le32(control); 1117 } 1118 if (FUIN_EN(uac2_opts)) { 1119 __le32 *bma = (__le32 *)&in_feature_unit_desc->bmaControls[0]; 1120 u32 control = 0; 1121 1122 if (uac2_opts->p_mute_present) 1123 control |= CONTROL_RDWR << FU_MUTE_CTRL; 1124 if (uac2_opts->p_volume_present) 1125 control |= CONTROL_RDWR << FU_VOL_CTRL; 1126 *bma = cpu_to_le32(control); 1127 } 1128 1129 ret = usb_interface_id(cfg, fn); 1130 if (ret < 0) { 1131 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1132 goto err_free_fu; 1133 } 1134 iad_desc.bFirstInterface = ret; 1135 1136 std_ac_if_desc.bInterfaceNumber = ret; 1137 uac2->ac_intf = ret; 1138 uac2->ac_alt = 0; 1139 1140 if (EPOUT_EN(uac2_opts)) { 1141 ret = usb_interface_id(cfg, fn); 1142 if (ret < 0) { 1143 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1144 goto err_free_fu; 1145 } 1146 std_as_out_if0_desc.bInterfaceNumber = ret; 1147 std_as_out_if1_desc.bInterfaceNumber = ret; 1148 std_as_out_if1_desc.bNumEndpoints = 1; 1149 uac2->as_out_intf = ret; 1150 uac2->as_out_alt = 0; 1151 1152 if (EPOUT_FBACK_IN_EN(uac2_opts)) { 1153 fs_epout_desc.bmAttributes = 1154 USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC; 1155 hs_epout_desc.bmAttributes = 1156 USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC; 1157 ss_epout_desc.bmAttributes = 1158 USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC; 1159 std_as_out_if1_desc.bNumEndpoints++; 1160 } else { 1161 fs_epout_desc.bmAttributes = 1162 USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE; 1163 hs_epout_desc.bmAttributes = 1164 USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE; 1165 ss_epout_desc.bmAttributes = 1166 USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE; 1167 } 1168 } 1169 1170 if (EPIN_EN(uac2_opts)) { 1171 ret = usb_interface_id(cfg, fn); 1172 if (ret < 0) { 1173 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1174 goto err_free_fu; 1175 } 1176 std_as_in_if0_desc.bInterfaceNumber = ret; 1177 std_as_in_if1_desc.bInterfaceNumber = ret; 1178 uac2->as_in_intf = ret; 1179 uac2->as_in_alt = 0; 1180 } 1181 1182 if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts)) { 1183 uac2->int_ep = usb_ep_autoconfig(gadget, &fs_ep_int_desc); 1184 if (!uac2->int_ep) { 1185 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1186 ret = -ENODEV; 1187 goto err_free_fu; 1188 } 1189 1190 std_ac_if_desc.bNumEndpoints = 1; 1191 } 1192 1193 hs_epin_desc.bInterval = uac2_opts->p_hs_bint; 1194 ss_epin_desc.bInterval = uac2_opts->p_hs_bint; 1195 hs_epout_desc.bInterval = uac2_opts->c_hs_bint; 1196 ss_epout_desc.bInterval = uac2_opts->c_hs_bint; 1197 1198 /* Calculate wMaxPacketSize according to audio bandwidth */ 1199 ret = set_ep_max_packet_size_bint(dev, uac2_opts, &fs_epin_desc, 1200 USB_SPEED_FULL, true); 1201 if (ret < 0) { 1202 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1203 return ret; 1204 } 1205 1206 ret = set_ep_max_packet_size_bint(dev, uac2_opts, &fs_epout_desc, 1207 USB_SPEED_FULL, false); 1208 if (ret < 0) { 1209 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1210 return ret; 1211 } 1212 1213 ret = set_ep_max_packet_size_bint(dev, uac2_opts, &hs_epin_desc, 1214 USB_SPEED_HIGH, true); 1215 if (ret < 0) { 1216 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1217 return ret; 1218 } 1219 1220 ret = set_ep_max_packet_size_bint(dev, uac2_opts, &hs_epout_desc, 1221 USB_SPEED_HIGH, false); 1222 if (ret < 0) { 1223 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1224 return ret; 1225 } 1226 1227 ret = set_ep_max_packet_size_bint(dev, uac2_opts, &ss_epin_desc, 1228 USB_SPEED_SUPER, true); 1229 if (ret < 0) { 1230 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1231 return ret; 1232 } 1233 1234 ret = set_ep_max_packet_size_bint(dev, uac2_opts, &ss_epout_desc, 1235 USB_SPEED_SUPER, false); 1236 if (ret < 0) { 1237 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1238 return ret; 1239 } 1240 1241 if (EPOUT_EN(uac2_opts)) { 1242 agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc); 1243 if (!agdev->out_ep) { 1244 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1245 ret = -ENODEV; 1246 goto err_free_fu; 1247 } 1248 if (EPOUT_FBACK_IN_EN(uac2_opts)) { 1249 agdev->in_ep_fback = usb_ep_autoconfig(gadget, 1250 &fs_epin_fback_desc); 1251 if (!agdev->in_ep_fback) { 1252 dev_err(dev, "%s:%d Error!\n", 1253 __func__, __LINE__); 1254 ret = -ENODEV; 1255 goto err_free_fu; 1256 } 1257 } 1258 } 1259 1260 if (EPIN_EN(uac2_opts)) { 1261 agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc); 1262 if (!agdev->in_ep) { 1263 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1264 ret = -ENODEV; 1265 goto err_free_fu; 1266 } 1267 } 1268 1269 agdev->in_ep_maxpsize = max_t(u16, 1270 le16_to_cpu(fs_epin_desc.wMaxPacketSize), 1271 le16_to_cpu(hs_epin_desc.wMaxPacketSize)); 1272 agdev->out_ep_maxpsize = max_t(u16, 1273 le16_to_cpu(fs_epout_desc.wMaxPacketSize), 1274 le16_to_cpu(hs_epout_desc.wMaxPacketSize)); 1275 1276 agdev->in_ep_maxpsize = max_t(u16, agdev->in_ep_maxpsize, 1277 le16_to_cpu(ss_epin_desc.wMaxPacketSize)); 1278 agdev->out_ep_maxpsize = max_t(u16, agdev->out_ep_maxpsize, 1279 le16_to_cpu(ss_epout_desc.wMaxPacketSize)); 1280 1281 ss_epin_desc_comp.wBytesPerInterval = ss_epin_desc.wMaxPacketSize; 1282 ss_epout_desc_comp.wBytesPerInterval = ss_epout_desc.wMaxPacketSize; 1283 1284 // HS and SS endpoint addresses are copied from autoconfigured FS descriptors 1285 hs_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress; 1286 hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress; 1287 hs_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress; 1288 hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress; 1289 ss_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress; 1290 ss_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress; 1291 ss_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress; 1292 ss_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress; 1293 1294 setup_descriptor(uac2_opts); 1295 1296 ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, ss_audio_desc, 1297 ss_audio_desc); 1298 if (ret) 1299 goto err_free_fu; 1300 1301 agdev->gadget = gadget; 1302 1303 agdev->params.p_chmask = uac2_opts->p_chmask; 1304 memcpy(agdev->params.p_srates, uac2_opts->p_srates, 1305 sizeof(agdev->params.p_srates)); 1306 agdev->params.p_ssize = uac2_opts->p_ssize; 1307 if (FUIN_EN(uac2_opts)) { 1308 agdev->params.p_fu.id = USB_IN_FU_ID; 1309 agdev->params.p_fu.mute_present = uac2_opts->p_mute_present; 1310 agdev->params.p_fu.volume_present = uac2_opts->p_volume_present; 1311 agdev->params.p_fu.volume_min = uac2_opts->p_volume_min; 1312 agdev->params.p_fu.volume_max = uac2_opts->p_volume_max; 1313 agdev->params.p_fu.volume_res = uac2_opts->p_volume_res; 1314 } 1315 agdev->params.c_chmask = uac2_opts->c_chmask; 1316 memcpy(agdev->params.c_srates, uac2_opts->c_srates, 1317 sizeof(agdev->params.c_srates)); 1318 agdev->params.c_ssize = uac2_opts->c_ssize; 1319 if (FUOUT_EN(uac2_opts)) { 1320 agdev->params.c_fu.id = USB_OUT_FU_ID; 1321 agdev->params.c_fu.mute_present = uac2_opts->c_mute_present; 1322 agdev->params.c_fu.volume_present = uac2_opts->c_volume_present; 1323 agdev->params.c_fu.volume_min = uac2_opts->c_volume_min; 1324 agdev->params.c_fu.volume_max = uac2_opts->c_volume_max; 1325 agdev->params.c_fu.volume_res = uac2_opts->c_volume_res; 1326 } 1327 agdev->params.req_number = uac2_opts->req_number; 1328 agdev->params.fb_max = uac2_opts->fb_max; 1329 1330 if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts)) 1331 agdev->notify = afunc_notify; 1332 1333 ret = g_audio_setup(agdev, "UAC2 PCM", "UAC2_Gadget"); 1334 if (ret) 1335 goto err_free_descs; 1336 1337 return 0; 1338 1339 err_free_descs: 1340 usb_free_all_descriptors(fn); 1341 agdev->gadget = NULL; 1342 err_free_fu: 1343 kfree(out_feature_unit_desc); 1344 out_feature_unit_desc = NULL; 1345 kfree(in_feature_unit_desc); 1346 in_feature_unit_desc = NULL; 1347 return ret; 1348 } 1349 1350 static void 1351 afunc_notify_complete(struct usb_ep *_ep, struct usb_request *req) 1352 { 1353 struct g_audio *agdev = req->context; 1354 struct f_uac2 *uac2 = func_to_uac2(&agdev->func); 1355 1356 atomic_dec(&uac2->int_count); 1357 kfree(req->buf); 1358 usb_ep_free_request(_ep, req); 1359 } 1360 1361 static int 1362 afunc_notify(struct g_audio *agdev, int unit_id, int cs) 1363 { 1364 struct f_uac2 *uac2 = func_to_uac2(&agdev->func); 1365 struct usb_request *req; 1366 struct uac2_interrupt_data_msg *msg; 1367 u16 w_index, w_value; 1368 int ret; 1369 1370 if (!uac2->int_ep->enabled) 1371 return 0; 1372 1373 if (atomic_inc_return(&uac2->int_count) > UAC2_DEF_INT_REQ_NUM) { 1374 atomic_dec(&uac2->int_count); 1375 return 0; 1376 } 1377 1378 req = usb_ep_alloc_request(uac2->int_ep, GFP_ATOMIC); 1379 if (req == NULL) { 1380 ret = -ENOMEM; 1381 goto err_dec_int_count; 1382 } 1383 1384 msg = kzalloc(sizeof(*msg), GFP_ATOMIC); 1385 if (msg == NULL) { 1386 ret = -ENOMEM; 1387 goto err_free_request; 1388 } 1389 1390 w_index = unit_id << 8 | uac2->ac_intf; 1391 w_value = cs << 8; 1392 1393 msg->bInfo = 0; /* Non-vendor, interface interrupt */ 1394 msg->bAttribute = UAC2_CS_CUR; 1395 msg->wIndex = cpu_to_le16(w_index); 1396 msg->wValue = cpu_to_le16(w_value); 1397 1398 req->length = sizeof(*msg); 1399 req->buf = msg; 1400 req->context = agdev; 1401 req->complete = afunc_notify_complete; 1402 1403 ret = usb_ep_queue(uac2->int_ep, req, GFP_ATOMIC); 1404 1405 if (ret) 1406 goto err_free_msg; 1407 1408 return 0; 1409 1410 err_free_msg: 1411 kfree(msg); 1412 err_free_request: 1413 usb_ep_free_request(uac2->int_ep, req); 1414 err_dec_int_count: 1415 atomic_dec(&uac2->int_count); 1416 1417 return ret; 1418 } 1419 1420 static int 1421 afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt) 1422 { 1423 struct usb_composite_dev *cdev = fn->config->cdev; 1424 struct f_uac2 *uac2 = func_to_uac2(fn); 1425 struct g_audio *agdev = func_to_g_audio(fn); 1426 struct usb_gadget *gadget = cdev->gadget; 1427 struct device *dev = &gadget->dev; 1428 int ret = 0; 1429 1430 /* No i/f has more than 2 alt settings */ 1431 if (alt > 1) { 1432 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1433 return -EINVAL; 1434 } 1435 1436 if (intf == uac2->ac_intf) { 1437 /* Control I/f has only 1 AltSetting - 0 */ 1438 if (alt) { 1439 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1440 return -EINVAL; 1441 } 1442 1443 /* restart interrupt endpoint */ 1444 if (uac2->int_ep) { 1445 usb_ep_disable(uac2->int_ep); 1446 config_ep_by_speed(gadget, &agdev->func, uac2->int_ep); 1447 usb_ep_enable(uac2->int_ep); 1448 } 1449 1450 return 0; 1451 } 1452 1453 if (intf == uac2->as_out_intf) { 1454 uac2->as_out_alt = alt; 1455 1456 if (alt) 1457 ret = u_audio_start_capture(&uac2->g_audio); 1458 else 1459 u_audio_stop_capture(&uac2->g_audio); 1460 } else if (intf == uac2->as_in_intf) { 1461 uac2->as_in_alt = alt; 1462 1463 if (alt) 1464 ret = u_audio_start_playback(&uac2->g_audio); 1465 else 1466 u_audio_stop_playback(&uac2->g_audio); 1467 } else { 1468 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1469 return -EINVAL; 1470 } 1471 1472 return ret; 1473 } 1474 1475 static int 1476 afunc_get_alt(struct usb_function *fn, unsigned intf) 1477 { 1478 struct f_uac2 *uac2 = func_to_uac2(fn); 1479 struct g_audio *agdev = func_to_g_audio(fn); 1480 1481 if (intf == uac2->ac_intf) 1482 return uac2->ac_alt; 1483 else if (intf == uac2->as_out_intf) 1484 return uac2->as_out_alt; 1485 else if (intf == uac2->as_in_intf) 1486 return uac2->as_in_alt; 1487 else 1488 dev_err(&agdev->gadget->dev, 1489 "%s:%d Invalid Interface %d!\n", 1490 __func__, __LINE__, intf); 1491 1492 return -EINVAL; 1493 } 1494 1495 static void 1496 afunc_disable(struct usb_function *fn) 1497 { 1498 struct f_uac2 *uac2 = func_to_uac2(fn); 1499 1500 uac2->as_in_alt = 0; 1501 uac2->as_out_alt = 0; 1502 u_audio_stop_capture(&uac2->g_audio); 1503 u_audio_stop_playback(&uac2->g_audio); 1504 if (uac2->int_ep) 1505 usb_ep_disable(uac2->int_ep); 1506 } 1507 1508 static void 1509 afunc_suspend(struct usb_function *fn) 1510 { 1511 struct f_uac2 *uac2 = func_to_uac2(fn); 1512 1513 u_audio_suspend(&uac2->g_audio); 1514 } 1515 1516 static int 1517 in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1518 { 1519 struct usb_request *req = fn->config->cdev->req; 1520 struct g_audio *agdev = func_to_g_audio(fn); 1521 struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev); 1522 u16 w_length = le16_to_cpu(cr->wLength); 1523 u16 w_index = le16_to_cpu(cr->wIndex); 1524 u16 w_value = le16_to_cpu(cr->wValue); 1525 u8 entity_id = (w_index >> 8) & 0xff; 1526 u8 control_selector = w_value >> 8; 1527 int value = -EOPNOTSUPP; 1528 u32 p_srate, c_srate; 1529 1530 u_audio_get_playback_srate(agdev, &p_srate); 1531 u_audio_get_capture_srate(agdev, &c_srate); 1532 1533 if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) { 1534 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) { 1535 struct cntrl_cur_lay3 c; 1536 1537 memset(&c, 0, sizeof(struct cntrl_cur_lay3)); 1538 1539 if (entity_id == USB_IN_CLK_ID) 1540 c.dCUR = cpu_to_le32(p_srate); 1541 else if (entity_id == USB_OUT_CLK_ID) 1542 c.dCUR = cpu_to_le32(c_srate); 1543 1544 value = min_t(unsigned int, w_length, sizeof(c)); 1545 memcpy(req->buf, &c, value); 1546 } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) { 1547 *(u8 *)req->buf = 1; 1548 value = min_t(unsigned int, w_length, 1); 1549 } else { 1550 dev_err(&agdev->gadget->dev, 1551 "%s:%d control_selector=%d TODO!\n", 1552 __func__, __LINE__, control_selector); 1553 } 1554 } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) || 1555 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) { 1556 unsigned int is_playback = 0; 1557 1558 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) 1559 is_playback = 1; 1560 1561 if (control_selector == UAC_FU_MUTE) { 1562 unsigned int mute; 1563 1564 u_audio_get_mute(agdev, is_playback, &mute); 1565 1566 *(u8 *)req->buf = mute; 1567 value = min_t(unsigned int, w_length, 1); 1568 } else if (control_selector == UAC_FU_VOLUME) { 1569 struct cntrl_cur_lay2 c; 1570 s16 volume; 1571 1572 memset(&c, 0, sizeof(struct cntrl_cur_lay2)); 1573 1574 u_audio_get_volume(agdev, is_playback, &volume); 1575 c.wCUR = cpu_to_le16(volume); 1576 1577 value = min_t(unsigned int, w_length, sizeof(c)); 1578 memcpy(req->buf, &c, value); 1579 } else { 1580 dev_err(&agdev->gadget->dev, 1581 "%s:%d control_selector=%d TODO!\n", 1582 __func__, __LINE__, control_selector); 1583 } 1584 } else { 1585 dev_err(&agdev->gadget->dev, 1586 "%s:%d entity_id=%d control_selector=%d TODO!\n", 1587 __func__, __LINE__, entity_id, control_selector); 1588 } 1589 1590 return value; 1591 } 1592 1593 static int 1594 in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1595 { 1596 struct usb_request *req = fn->config->cdev->req; 1597 struct g_audio *agdev = func_to_g_audio(fn); 1598 struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev); 1599 u16 w_length = le16_to_cpu(cr->wLength); 1600 u16 w_index = le16_to_cpu(cr->wIndex); 1601 u16 w_value = le16_to_cpu(cr->wValue); 1602 u8 entity_id = (w_index >> 8) & 0xff; 1603 u8 control_selector = w_value >> 8; 1604 int value = -EOPNOTSUPP; 1605 1606 if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) { 1607 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) { 1608 struct cntrl_ranges_lay3_srates rs; 1609 int i; 1610 int wNumSubRanges = 0; 1611 int srate; 1612 int *srates; 1613 1614 if (entity_id == USB_IN_CLK_ID) 1615 srates = opts->p_srates; 1616 else if (entity_id == USB_OUT_CLK_ID) 1617 srates = opts->c_srates; 1618 else 1619 return -EOPNOTSUPP; 1620 for (i = 0; i < UAC_MAX_RATES; i++) { 1621 srate = srates[i]; 1622 if (srate == 0) 1623 break; 1624 1625 rs.r[wNumSubRanges].dMIN = cpu_to_le32(srate); 1626 rs.r[wNumSubRanges].dMAX = cpu_to_le32(srate); 1627 rs.r[wNumSubRanges].dRES = 0; 1628 wNumSubRanges++; 1629 dev_dbg(&agdev->gadget->dev, 1630 "%s(): clk %d: rate ID %d: %d\n", 1631 __func__, entity_id, wNumSubRanges, srate); 1632 } 1633 rs.wNumSubRanges = cpu_to_le16(wNumSubRanges); 1634 value = min_t(unsigned int, w_length, ranges_lay3_size(rs)); 1635 dev_dbg(&agdev->gadget->dev, "%s(): sending %d rates, size %d\n", 1636 __func__, rs.wNumSubRanges, value); 1637 memcpy(req->buf, &rs, value); 1638 } else { 1639 dev_err(&agdev->gadget->dev, 1640 "%s:%d control_selector=%d TODO!\n", 1641 __func__, __LINE__, control_selector); 1642 } 1643 } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) || 1644 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) { 1645 unsigned int is_playback = 0; 1646 1647 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) 1648 is_playback = 1; 1649 1650 if (control_selector == UAC_FU_VOLUME) { 1651 struct cntrl_range_lay2 r; 1652 s16 max_db, min_db, res_db; 1653 1654 if (is_playback) { 1655 max_db = opts->p_volume_max; 1656 min_db = opts->p_volume_min; 1657 res_db = opts->p_volume_res; 1658 } else { 1659 max_db = opts->c_volume_max; 1660 min_db = opts->c_volume_min; 1661 res_db = opts->c_volume_res; 1662 } 1663 1664 r.wMAX = cpu_to_le16(max_db); 1665 r.wMIN = cpu_to_le16(min_db); 1666 r.wRES = cpu_to_le16(res_db); 1667 r.wNumSubRanges = cpu_to_le16(1); 1668 1669 value = min_t(unsigned int, w_length, sizeof(r)); 1670 memcpy(req->buf, &r, value); 1671 } else { 1672 dev_err(&agdev->gadget->dev, 1673 "%s:%d control_selector=%d TODO!\n", 1674 __func__, __LINE__, control_selector); 1675 } 1676 } else { 1677 dev_err(&agdev->gadget->dev, 1678 "%s:%d entity_id=%d control_selector=%d TODO!\n", 1679 __func__, __LINE__, entity_id, control_selector); 1680 } 1681 1682 return value; 1683 } 1684 1685 static int 1686 ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1687 { 1688 if (cr->bRequest == UAC2_CS_CUR) 1689 return in_rq_cur(fn, cr); 1690 else if (cr->bRequest == UAC2_CS_RANGE) 1691 return in_rq_range(fn, cr); 1692 else 1693 return -EOPNOTSUPP; 1694 } 1695 1696 static void uac2_cs_control_sam_freq(struct usb_ep *ep, struct usb_request *req) 1697 { 1698 struct usb_function *fn = ep->driver_data; 1699 struct g_audio *agdev = func_to_g_audio(fn); 1700 struct f_uac2 *uac2 = func_to_uac2(fn); 1701 u32 val; 1702 1703 if (req->actual != 4) 1704 return; 1705 1706 val = le32_to_cpu(*((__le32 *)req->buf)); 1707 dev_dbg(&agdev->gadget->dev, "%s val: %d.\n", __func__, val); 1708 if (uac2->clock_id == USB_IN_CLK_ID) { 1709 u_audio_set_playback_srate(agdev, val); 1710 } else if (uac2->clock_id == USB_OUT_CLK_ID) { 1711 u_audio_set_capture_srate(agdev, val); 1712 } 1713 } 1714 1715 static void 1716 out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req) 1717 { 1718 struct g_audio *agdev = req->context; 1719 struct usb_composite_dev *cdev = agdev->func.config->cdev; 1720 struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev); 1721 struct f_uac2 *uac2 = func_to_uac2(&agdev->func); 1722 struct usb_ctrlrequest *cr = &uac2->setup_cr; 1723 u16 w_index = le16_to_cpu(cr->wIndex); 1724 u16 w_value = le16_to_cpu(cr->wValue); 1725 u8 entity_id = (w_index >> 8) & 0xff; 1726 u8 control_selector = w_value >> 8; 1727 1728 if (req->status != 0) { 1729 dev_dbg(&cdev->gadget->dev, "completion err %d\n", req->status); 1730 return; 1731 } 1732 1733 if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) || 1734 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) { 1735 unsigned int is_playback = 0; 1736 1737 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) 1738 is_playback = 1; 1739 1740 if (control_selector == UAC_FU_MUTE) { 1741 u8 mute = *(u8 *)req->buf; 1742 1743 u_audio_set_mute(agdev, is_playback, mute); 1744 1745 return; 1746 } else if (control_selector == UAC_FU_VOLUME) { 1747 struct cntrl_cur_lay2 *c = req->buf; 1748 s16 volume; 1749 1750 volume = le16_to_cpu(c->wCUR); 1751 u_audio_set_volume(agdev, is_playback, volume); 1752 1753 return; 1754 } else { 1755 dev_err(&agdev->gadget->dev, 1756 "%s:%d control_selector=%d TODO!\n", 1757 __func__, __LINE__, control_selector); 1758 usb_ep_set_halt(ep); 1759 } 1760 } 1761 } 1762 1763 static int 1764 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1765 { 1766 struct usb_composite_dev *cdev = fn->config->cdev; 1767 struct usb_request *req = fn->config->cdev->req; 1768 struct g_audio *agdev = func_to_g_audio(fn); 1769 struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev); 1770 struct f_uac2 *uac2 = func_to_uac2(fn); 1771 u16 w_length = le16_to_cpu(cr->wLength); 1772 u16 w_index = le16_to_cpu(cr->wIndex); 1773 u16 w_value = le16_to_cpu(cr->wValue); 1774 u8 entity_id = (w_index >> 8) & 0xff; 1775 u8 control_selector = w_value >> 8; 1776 u8 clock_id = w_index >> 8; 1777 1778 if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) { 1779 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) { 1780 dev_dbg(&agdev->gadget->dev, 1781 "control_selector UAC2_CS_CONTROL_SAM_FREQ, clock: %d\n", clock_id); 1782 cdev->gadget->ep0->driver_data = fn; 1783 uac2->clock_id = clock_id; 1784 req->complete = uac2_cs_control_sam_freq; 1785 return w_length; 1786 } 1787 } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) || 1788 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) { 1789 memcpy(&uac2->setup_cr, cr, sizeof(*cr)); 1790 req->context = agdev; 1791 req->complete = out_rq_cur_complete; 1792 1793 return w_length; 1794 } else { 1795 dev_err(&agdev->gadget->dev, 1796 "%s:%d entity_id=%d control_selector=%d TODO!\n", 1797 __func__, __LINE__, entity_id, control_selector); 1798 } 1799 return -EOPNOTSUPP; 1800 } 1801 1802 static int 1803 setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1804 { 1805 struct f_uac2 *uac2 = func_to_uac2(fn); 1806 struct g_audio *agdev = func_to_g_audio(fn); 1807 u16 w_index = le16_to_cpu(cr->wIndex); 1808 u8 intf = w_index & 0xff; 1809 1810 if (intf != uac2->ac_intf) { 1811 dev_err(&agdev->gadget->dev, 1812 "%s:%d Error!\n", __func__, __LINE__); 1813 return -EOPNOTSUPP; 1814 } 1815 1816 if (cr->bRequestType & USB_DIR_IN) 1817 return ac_rq_in(fn, cr); 1818 else if (cr->bRequest == UAC2_CS_CUR) 1819 return out_rq_cur(fn, cr); 1820 1821 return -EOPNOTSUPP; 1822 } 1823 1824 static int 1825 afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1826 { 1827 struct usb_composite_dev *cdev = fn->config->cdev; 1828 struct g_audio *agdev = func_to_g_audio(fn); 1829 struct usb_request *req = cdev->req; 1830 u16 w_length = le16_to_cpu(cr->wLength); 1831 int value = -EOPNOTSUPP; 1832 1833 /* Only Class specific requests are supposed to reach here */ 1834 if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) 1835 return -EOPNOTSUPP; 1836 1837 if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE) 1838 value = setup_rq_inf(fn, cr); 1839 else 1840 dev_err(&agdev->gadget->dev, "%s:%d Error!\n", 1841 __func__, __LINE__); 1842 1843 if (value >= 0) { 1844 req->length = value; 1845 req->zero = value < w_length; 1846 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); 1847 if (value < 0) { 1848 dev_err(&agdev->gadget->dev, 1849 "%s:%d Error!\n", __func__, __LINE__); 1850 req->status = 0; 1851 } 1852 } 1853 1854 return value; 1855 } 1856 1857 static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item) 1858 { 1859 return container_of(to_config_group(item), struct f_uac2_opts, 1860 func_inst.group); 1861 } 1862 1863 static void f_uac2_attr_release(struct config_item *item) 1864 { 1865 struct f_uac2_opts *opts = to_f_uac2_opts(item); 1866 1867 usb_put_function_instance(&opts->func_inst); 1868 } 1869 1870 static struct configfs_item_operations f_uac2_item_ops = { 1871 .release = f_uac2_attr_release, 1872 }; 1873 1874 #define uac2_kstrtou8 kstrtou8 1875 #define uac2_kstrtou32 kstrtou32 1876 #define uac2_kstrtos16 kstrtos16 1877 #define uac2_kstrtobool(s, base, res) kstrtobool((s), (res)) 1878 1879 static const char *u8_fmt = "%u\n"; 1880 static const char *u32_fmt = "%u\n"; 1881 static const char *s16_fmt = "%hd\n"; 1882 static const char *bool_fmt = "%u\n"; 1883 1884 #define UAC2_ATTRIBUTE(type, name) \ 1885 static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \ 1886 char *page) \ 1887 { \ 1888 struct f_uac2_opts *opts = to_f_uac2_opts(item); \ 1889 int result; \ 1890 \ 1891 mutex_lock(&opts->lock); \ 1892 result = sprintf(page, type##_fmt, opts->name); \ 1893 mutex_unlock(&opts->lock); \ 1894 \ 1895 return result; \ 1896 } \ 1897 \ 1898 static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \ 1899 const char *page, size_t len) \ 1900 { \ 1901 struct f_uac2_opts *opts = to_f_uac2_opts(item); \ 1902 int ret; \ 1903 type num; \ 1904 \ 1905 mutex_lock(&opts->lock); \ 1906 if (opts->refcnt) { \ 1907 ret = -EBUSY; \ 1908 goto end; \ 1909 } \ 1910 \ 1911 ret = uac2_kstrto##type(page, 0, &num); \ 1912 if (ret) \ 1913 goto end; \ 1914 \ 1915 opts->name = num; \ 1916 ret = len; \ 1917 \ 1918 end: \ 1919 mutex_unlock(&opts->lock); \ 1920 return ret; \ 1921 } \ 1922 \ 1923 CONFIGFS_ATTR(f_uac2_opts_, name) 1924 1925 #define UAC2_ATTRIBUTE_SYNC(name) \ 1926 static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \ 1927 char *page) \ 1928 { \ 1929 struct f_uac2_opts *opts = to_f_uac2_opts(item); \ 1930 int result; \ 1931 char *str; \ 1932 \ 1933 mutex_lock(&opts->lock); \ 1934 switch (opts->name) { \ 1935 case USB_ENDPOINT_SYNC_ASYNC: \ 1936 str = "async"; \ 1937 break; \ 1938 case USB_ENDPOINT_SYNC_ADAPTIVE: \ 1939 str = "adaptive"; \ 1940 break; \ 1941 default: \ 1942 str = "unknown"; \ 1943 break; \ 1944 } \ 1945 result = sprintf(page, "%s\n", str); \ 1946 mutex_unlock(&opts->lock); \ 1947 \ 1948 return result; \ 1949 } \ 1950 \ 1951 static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \ 1952 const char *page, size_t len) \ 1953 { \ 1954 struct f_uac2_opts *opts = to_f_uac2_opts(item); \ 1955 int ret = 0; \ 1956 \ 1957 mutex_lock(&opts->lock); \ 1958 if (opts->refcnt) { \ 1959 ret = -EBUSY; \ 1960 goto end; \ 1961 } \ 1962 \ 1963 if (!strncmp(page, "async", 5)) \ 1964 opts->name = USB_ENDPOINT_SYNC_ASYNC; \ 1965 else if (!strncmp(page, "adaptive", 8)) \ 1966 opts->name = USB_ENDPOINT_SYNC_ADAPTIVE; \ 1967 else { \ 1968 ret = -EINVAL; \ 1969 goto end; \ 1970 } \ 1971 \ 1972 ret = len; \ 1973 \ 1974 end: \ 1975 mutex_unlock(&opts->lock); \ 1976 return ret; \ 1977 } \ 1978 \ 1979 CONFIGFS_ATTR(f_uac2_opts_, name) 1980 1981 #define UAC2_RATE_ATTRIBUTE(name) \ 1982 static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \ 1983 char *page) \ 1984 { \ 1985 struct f_uac2_opts *opts = to_f_uac2_opts(item); \ 1986 int result = 0; \ 1987 int i; \ 1988 \ 1989 mutex_lock(&opts->lock); \ 1990 page[0] = '\0'; \ 1991 for (i = 0; i < UAC_MAX_RATES; i++) { \ 1992 if (opts->name##s[i] == 0) \ 1993 break; \ 1994 result += sprintf(page + strlen(page), "%u,", \ 1995 opts->name##s[i]); \ 1996 } \ 1997 if (strlen(page) > 0) \ 1998 page[strlen(page) - 1] = '\n'; \ 1999 mutex_unlock(&opts->lock); \ 2000 \ 2001 return result; \ 2002 } \ 2003 \ 2004 static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \ 2005 const char *page, size_t len) \ 2006 { \ 2007 struct f_uac2_opts *opts = to_f_uac2_opts(item); \ 2008 char *split_page = NULL; \ 2009 int ret = -EINVAL; \ 2010 char *token; \ 2011 u32 num; \ 2012 int i; \ 2013 \ 2014 mutex_lock(&opts->lock); \ 2015 if (opts->refcnt) { \ 2016 ret = -EBUSY; \ 2017 goto end; \ 2018 } \ 2019 \ 2020 i = 0; \ 2021 memset(opts->name##s, 0x00, sizeof(opts->name##s)); \ 2022 split_page = kstrdup(page, GFP_KERNEL); \ 2023 while ((token = strsep(&split_page, ",")) != NULL) { \ 2024 ret = kstrtou32(token, 0, &num); \ 2025 if (ret) \ 2026 goto end; \ 2027 \ 2028 opts->name##s[i++] = num; \ 2029 ret = len; \ 2030 }; \ 2031 \ 2032 end: \ 2033 kfree(split_page); \ 2034 mutex_unlock(&opts->lock); \ 2035 return ret; \ 2036 } \ 2037 \ 2038 CONFIGFS_ATTR(f_uac2_opts_, name) 2039 2040 #define UAC2_ATTRIBUTE_STRING(name) \ 2041 static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \ 2042 char *page) \ 2043 { \ 2044 struct f_uac2_opts *opts = to_f_uac2_opts(item); \ 2045 int result; \ 2046 \ 2047 mutex_lock(&opts->lock); \ 2048 result = scnprintf(page, sizeof(opts->name), "%s", opts->name); \ 2049 mutex_unlock(&opts->lock); \ 2050 \ 2051 return result; \ 2052 } \ 2053 \ 2054 static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \ 2055 const char *page, size_t len) \ 2056 { \ 2057 struct f_uac2_opts *opts = to_f_uac2_opts(item); \ 2058 int ret = 0; \ 2059 \ 2060 mutex_lock(&opts->lock); \ 2061 if (opts->refcnt) { \ 2062 ret = -EBUSY; \ 2063 goto end; \ 2064 } \ 2065 \ 2066 if (len && page[len - 1] == '\n') \ 2067 len--; \ 2068 \ 2069 ret = scnprintf(opts->name, min(sizeof(opts->name), len + 1), \ 2070 "%s", page); \ 2071 \ 2072 end: \ 2073 mutex_unlock(&opts->lock); \ 2074 return ret; \ 2075 } \ 2076 \ 2077 CONFIGFS_ATTR(f_uac2_opts_, name) 2078 2079 UAC2_ATTRIBUTE(u32, p_chmask); 2080 UAC2_RATE_ATTRIBUTE(p_srate); 2081 UAC2_ATTRIBUTE(u32, p_ssize); 2082 UAC2_ATTRIBUTE(u8, p_hs_bint); 2083 UAC2_ATTRIBUTE(u32, c_chmask); 2084 UAC2_RATE_ATTRIBUTE(c_srate); 2085 UAC2_ATTRIBUTE_SYNC(c_sync); 2086 UAC2_ATTRIBUTE(u32, c_ssize); 2087 UAC2_ATTRIBUTE(u8, c_hs_bint); 2088 UAC2_ATTRIBUTE(u32, req_number); 2089 2090 UAC2_ATTRIBUTE(bool, p_mute_present); 2091 UAC2_ATTRIBUTE(bool, p_volume_present); 2092 UAC2_ATTRIBUTE(s16, p_volume_min); 2093 UAC2_ATTRIBUTE(s16, p_volume_max); 2094 UAC2_ATTRIBUTE(s16, p_volume_res); 2095 2096 UAC2_ATTRIBUTE(bool, c_mute_present); 2097 UAC2_ATTRIBUTE(bool, c_volume_present); 2098 UAC2_ATTRIBUTE(s16, c_volume_min); 2099 UAC2_ATTRIBUTE(s16, c_volume_max); 2100 UAC2_ATTRIBUTE(s16, c_volume_res); 2101 UAC2_ATTRIBUTE(u32, fb_max); 2102 UAC2_ATTRIBUTE_STRING(function_name); 2103 2104 UAC2_ATTRIBUTE(s16, p_terminal_type); 2105 UAC2_ATTRIBUTE(s16, c_terminal_type); 2106 2107 static struct configfs_attribute *f_uac2_attrs[] = { 2108 &f_uac2_opts_attr_p_chmask, 2109 &f_uac2_opts_attr_p_srate, 2110 &f_uac2_opts_attr_p_ssize, 2111 &f_uac2_opts_attr_p_hs_bint, 2112 &f_uac2_opts_attr_c_chmask, 2113 &f_uac2_opts_attr_c_srate, 2114 &f_uac2_opts_attr_c_ssize, 2115 &f_uac2_opts_attr_c_hs_bint, 2116 &f_uac2_opts_attr_c_sync, 2117 &f_uac2_opts_attr_req_number, 2118 &f_uac2_opts_attr_fb_max, 2119 2120 &f_uac2_opts_attr_p_mute_present, 2121 &f_uac2_opts_attr_p_volume_present, 2122 &f_uac2_opts_attr_p_volume_min, 2123 &f_uac2_opts_attr_p_volume_max, 2124 &f_uac2_opts_attr_p_volume_res, 2125 2126 &f_uac2_opts_attr_c_mute_present, 2127 &f_uac2_opts_attr_c_volume_present, 2128 &f_uac2_opts_attr_c_volume_min, 2129 &f_uac2_opts_attr_c_volume_max, 2130 &f_uac2_opts_attr_c_volume_res, 2131 2132 &f_uac2_opts_attr_function_name, 2133 2134 &f_uac2_opts_attr_p_terminal_type, 2135 &f_uac2_opts_attr_c_terminal_type, 2136 2137 NULL, 2138 }; 2139 2140 static const struct config_item_type f_uac2_func_type = { 2141 .ct_item_ops = &f_uac2_item_ops, 2142 .ct_attrs = f_uac2_attrs, 2143 .ct_owner = THIS_MODULE, 2144 }; 2145 2146 static void afunc_free_inst(struct usb_function_instance *f) 2147 { 2148 struct f_uac2_opts *opts; 2149 2150 opts = container_of(f, struct f_uac2_opts, func_inst); 2151 kfree(opts); 2152 } 2153 2154 static struct usb_function_instance *afunc_alloc_inst(void) 2155 { 2156 struct f_uac2_opts *opts; 2157 2158 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 2159 if (!opts) 2160 return ERR_PTR(-ENOMEM); 2161 2162 mutex_init(&opts->lock); 2163 opts->func_inst.free_func_inst = afunc_free_inst; 2164 2165 config_group_init_type_name(&opts->func_inst.group, "", 2166 &f_uac2_func_type); 2167 2168 opts->p_chmask = UAC2_DEF_PCHMASK; 2169 opts->p_srates[0] = UAC2_DEF_PSRATE; 2170 opts->p_ssize = UAC2_DEF_PSSIZE; 2171 opts->p_hs_bint = UAC2_DEF_PHSBINT; 2172 opts->c_chmask = UAC2_DEF_CCHMASK; 2173 opts->c_srates[0] = UAC2_DEF_CSRATE; 2174 opts->c_ssize = UAC2_DEF_CSSIZE; 2175 opts->c_hs_bint = UAC2_DEF_CHSBINT; 2176 opts->c_sync = UAC2_DEF_CSYNC; 2177 2178 opts->p_mute_present = UAC2_DEF_MUTE_PRESENT; 2179 opts->p_volume_present = UAC2_DEF_VOLUME_PRESENT; 2180 opts->p_volume_min = UAC2_DEF_MIN_DB; 2181 opts->p_volume_max = UAC2_DEF_MAX_DB; 2182 opts->p_volume_res = UAC2_DEF_RES_DB; 2183 2184 opts->c_mute_present = UAC2_DEF_MUTE_PRESENT; 2185 opts->c_volume_present = UAC2_DEF_VOLUME_PRESENT; 2186 opts->c_volume_min = UAC2_DEF_MIN_DB; 2187 opts->c_volume_max = UAC2_DEF_MAX_DB; 2188 opts->c_volume_res = UAC2_DEF_RES_DB; 2189 2190 opts->req_number = UAC2_DEF_REQ_NUM; 2191 opts->fb_max = FBACK_FAST_MAX; 2192 2193 scnprintf(opts->function_name, sizeof(opts->function_name), "Source/Sink"); 2194 2195 opts->p_terminal_type = UAC2_DEF_P_TERM_TYPE; 2196 opts->c_terminal_type = UAC2_DEF_C_TERM_TYPE; 2197 2198 return &opts->func_inst; 2199 } 2200 2201 static void afunc_free(struct usb_function *f) 2202 { 2203 struct g_audio *agdev; 2204 struct f_uac2_opts *opts; 2205 2206 agdev = func_to_g_audio(f); 2207 opts = container_of(f->fi, struct f_uac2_opts, func_inst); 2208 kfree(agdev); 2209 mutex_lock(&opts->lock); 2210 --opts->refcnt; 2211 mutex_unlock(&opts->lock); 2212 } 2213 2214 static void afunc_unbind(struct usb_configuration *c, struct usb_function *f) 2215 { 2216 struct g_audio *agdev = func_to_g_audio(f); 2217 2218 g_audio_cleanup(agdev); 2219 usb_free_all_descriptors(f); 2220 2221 agdev->gadget = NULL; 2222 2223 kfree(out_feature_unit_desc); 2224 out_feature_unit_desc = NULL; 2225 kfree(in_feature_unit_desc); 2226 in_feature_unit_desc = NULL; 2227 } 2228 2229 static struct usb_function *afunc_alloc(struct usb_function_instance *fi) 2230 { 2231 struct f_uac2 *uac2; 2232 struct f_uac2_opts *opts; 2233 2234 uac2 = kzalloc(sizeof(*uac2), GFP_KERNEL); 2235 if (uac2 == NULL) 2236 return ERR_PTR(-ENOMEM); 2237 2238 opts = container_of(fi, struct f_uac2_opts, func_inst); 2239 mutex_lock(&opts->lock); 2240 ++opts->refcnt; 2241 mutex_unlock(&opts->lock); 2242 2243 uac2->g_audio.func.name = "uac2_func"; 2244 uac2->g_audio.func.bind = afunc_bind; 2245 uac2->g_audio.func.unbind = afunc_unbind; 2246 uac2->g_audio.func.set_alt = afunc_set_alt; 2247 uac2->g_audio.func.get_alt = afunc_get_alt; 2248 uac2->g_audio.func.disable = afunc_disable; 2249 uac2->g_audio.func.suspend = afunc_suspend; 2250 uac2->g_audio.func.setup = afunc_setup; 2251 uac2->g_audio.func.free_func = afunc_free; 2252 2253 return &uac2->g_audio.func; 2254 } 2255 2256 DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc); 2257 MODULE_DESCRIPTION("USB Audio Class 2.0 Function"); 2258 MODULE_LICENSE("GPL"); 2259 MODULE_AUTHOR("Yadwinder Singh"); 2260 MODULE_AUTHOR("Jaswinder Singh"); 2261 MODULE_AUTHOR("Ruslan Bilovol"); 2262