1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2010 Hans Petter Selasky. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 /* 29 * USB audio specs: http://www.usb.org/developers/devclass_docs/audio10.pdf 30 * http://www.usb.org/developers/devclass_docs/frmts10.pdf 31 * http://www.usb.org/developers/devclass_docs/termt10.pdf 32 */ 33 34 #include <sys/param.h> 35 #include <sys/stdint.h> 36 #include <sys/stddef.h> 37 #include <sys/queue.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/bus.h> 41 #include <sys/linker_set.h> 42 #include <sys/module.h> 43 #include <sys/lock.h> 44 #include <sys/mutex.h> 45 #include <sys/condvar.h> 46 #include <sys/sysctl.h> 47 #include <sys/sx.h> 48 #include <sys/unistd.h> 49 #include <sys/callout.h> 50 #include <sys/malloc.h> 51 #include <sys/priv.h> 52 53 #include <dev/usb/usb.h> 54 #include <dev/usb/usb_cdc.h> 55 #include <dev/usb/usbdi.h> 56 #include <dev/usb/usbdi_util.h> 57 #include <dev/usb/usbhid.h> 58 #include "usb_if.h" 59 60 #define USB_DEBUG_VAR g_audio_debug 61 #include <dev/usb/usb_debug.h> 62 63 #include <dev/usb/gadget/g_audio.h> 64 65 enum { 66 G_AUDIO_ISOC0_RD, 67 G_AUDIO_ISOC1_RD, 68 G_AUDIO_ISOC0_WR, 69 G_AUDIO_ISOC1_WR, 70 G_AUDIO_N_TRANSFER, 71 }; 72 73 struct g_audio_softc { 74 struct mtx sc_mtx; 75 struct usb_callout sc_callout; 76 struct usb_callout sc_watchdog; 77 struct usb_xfer *sc_xfer[G_AUDIO_N_TRANSFER]; 78 79 int sc_mode; 80 int sc_pattern_len; 81 int sc_throughput; 82 int sc_tx_interval; 83 int sc_state; 84 int sc_noise_rem; 85 86 int8_t sc_pattern[G_AUDIO_MAX_STRLEN]; 87 88 uint16_t sc_data_len[2][G_AUDIO_FRAMES]; 89 90 int16_t sc_data_buf[2][G_AUDIO_BUFSIZE / 2]; 91 92 uint8_t sc_volume_setting[32]; 93 uint8_t sc_volume_limit[32]; 94 uint8_t sc_sample_rate[32]; 95 }; 96 97 static SYSCTL_NODE(_hw_usb, OID_AUTO, g_audio, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 98 "USB audio gadget"); 99 100 #ifdef USB_DEBUG 101 static int g_audio_debug = 0; 102 103 SYSCTL_INT(_hw_usb_g_audio, OID_AUTO, debug, CTLFLAG_RWTUN, 104 &g_audio_debug, 0, "Debug level"); 105 #endif 106 107 static int g_audio_mode = 0; 108 109 SYSCTL_INT(_hw_usb_g_audio, OID_AUTO, mode, CTLFLAG_RWTUN, 110 &g_audio_mode, 0, "Mode selection"); 111 112 static int g_audio_pattern_interval = 1000; 113 114 SYSCTL_INT(_hw_usb_g_audio, OID_AUTO, pattern_interval, CTLFLAG_RWTUN, 115 &g_audio_pattern_interval, 0, "Pattern interval in milliseconds"); 116 117 static char g_audio_pattern_data[G_AUDIO_MAX_STRLEN]; 118 119 SYSCTL_STRING(_hw_usb_g_audio, OID_AUTO, pattern, CTLFLAG_RW, 120 &g_audio_pattern_data, sizeof(g_audio_pattern_data), "Data pattern"); 121 122 static int g_audio_throughput; 123 124 SYSCTL_INT(_hw_usb_g_audio, OID_AUTO, throughput, CTLFLAG_RD, 125 &g_audio_throughput, sizeof(g_audio_throughput), "Throughput in bytes per second"); 126 127 static device_probe_t g_audio_probe; 128 static device_attach_t g_audio_attach; 129 static device_detach_t g_audio_detach; 130 static usb_handle_request_t g_audio_handle_request; 131 132 static usb_callback_t g_audio_isoc_read_callback; 133 static usb_callback_t g_audio_isoc_write_callback; 134 135 static void g_audio_watchdog(void *arg); 136 static void g_audio_timeout(void *arg); 137 138 static device_method_t g_audio_methods[] = { 139 /* USB interface */ 140 DEVMETHOD(usb_handle_request, g_audio_handle_request), 141 142 /* Device interface */ 143 DEVMETHOD(device_probe, g_audio_probe), 144 DEVMETHOD(device_attach, g_audio_attach), 145 DEVMETHOD(device_detach, g_audio_detach), 146 147 DEVMETHOD_END 148 }; 149 150 static driver_t g_audio_driver = { 151 .name = "g_audio", 152 .methods = g_audio_methods, 153 .size = sizeof(struct g_audio_softc), 154 }; 155 156 DRIVER_MODULE(g_audio, uhub, g_audio_driver, 0, 0); 157 MODULE_DEPEND(g_audio, usb, 1, 1, 1); 158 159 static const struct usb_config g_audio_config[G_AUDIO_N_TRANSFER] = { 160 [G_AUDIO_ISOC0_RD] = { 161 .type = UE_ISOCHRONOUS, 162 .endpoint = UE_ADDR_ANY, 163 .direction = UE_DIR_RX, 164 .flags = {.ext_buffer = 1,.pipe_bof = 1,.short_xfer_ok = 1,}, 165 .bufsize = G_AUDIO_BUFSIZE, 166 .callback = &g_audio_isoc_read_callback, 167 .frames = G_AUDIO_FRAMES, 168 .usb_mode = USB_MODE_DEVICE, 169 .if_index = 1, 170 }, 171 172 [G_AUDIO_ISOC1_RD] = { 173 .type = UE_ISOCHRONOUS, 174 .endpoint = UE_ADDR_ANY, 175 .direction = UE_DIR_RX, 176 .flags = {.ext_buffer = 1,.pipe_bof = 1,.short_xfer_ok = 1,}, 177 .bufsize = G_AUDIO_BUFSIZE, 178 .callback = &g_audio_isoc_read_callback, 179 .frames = G_AUDIO_FRAMES, 180 .usb_mode = USB_MODE_DEVICE, 181 .if_index = 1, 182 }, 183 184 [G_AUDIO_ISOC0_WR] = { 185 .type = UE_ISOCHRONOUS, 186 .endpoint = UE_ADDR_ANY, 187 .direction = UE_DIR_TX, 188 .flags = {.ext_buffer = 1,.pipe_bof = 1,}, 189 .bufsize = G_AUDIO_BUFSIZE, 190 .callback = &g_audio_isoc_write_callback, 191 .frames = G_AUDIO_FRAMES, 192 .usb_mode = USB_MODE_DEVICE, 193 .if_index = 2, 194 }, 195 196 [G_AUDIO_ISOC1_WR] = { 197 .type = UE_ISOCHRONOUS, 198 .endpoint = UE_ADDR_ANY, 199 .direction = UE_DIR_TX, 200 .flags = {.ext_buffer = 1,.pipe_bof = 1,}, 201 .bufsize = G_AUDIO_BUFSIZE, 202 .callback = &g_audio_isoc_write_callback, 203 .frames = G_AUDIO_FRAMES, 204 .usb_mode = USB_MODE_DEVICE, 205 .if_index = 2, 206 }, 207 }; 208 209 static void 210 g_audio_timeout_reset(struct g_audio_softc *sc) 211 { 212 int i = g_audio_pattern_interval; 213 214 sc->sc_tx_interval = i; 215 216 if (i <= 0) 217 i = 1; 218 else if (i > 1023) 219 i = 1023; 220 221 i = USB_MS_TO_TICKS(i); 222 223 usb_callout_reset(&sc->sc_callout, i, &g_audio_timeout, sc); 224 } 225 226 static void 227 g_audio_timeout(void *arg) 228 { 229 struct g_audio_softc *sc = arg; 230 231 sc->sc_mode = g_audio_mode; 232 233 memcpy(sc->sc_pattern, g_audio_pattern_data, sizeof(sc->sc_pattern)); 234 235 sc->sc_pattern[G_AUDIO_MAX_STRLEN - 1] = 0; 236 237 sc->sc_pattern_len = strlen(sc->sc_pattern); 238 239 if (sc->sc_mode != G_AUDIO_MODE_LOOP) { 240 usbd_transfer_start(sc->sc_xfer[G_AUDIO_ISOC0_WR]); 241 usbd_transfer_start(sc->sc_xfer[G_AUDIO_ISOC1_WR]); 242 } 243 g_audio_timeout_reset(sc); 244 } 245 246 static void 247 g_audio_watchdog_reset(struct g_audio_softc *sc) 248 { 249 usb_callout_reset(&sc->sc_watchdog, hz, &g_audio_watchdog, sc); 250 } 251 252 static void 253 g_audio_watchdog(void *arg) 254 { 255 struct g_audio_softc *sc = arg; 256 int i; 257 258 i = sc->sc_throughput; 259 260 sc->sc_throughput = 0; 261 262 g_audio_throughput = i; 263 264 g_audio_watchdog_reset(sc); 265 } 266 267 static int 268 g_audio_probe(device_t dev) 269 { 270 struct usb_attach_arg *uaa = device_get_ivars(dev); 271 272 DPRINTFN(11, "\n"); 273 274 if (uaa->usb_mode != USB_MODE_DEVICE) 275 return (ENXIO); 276 277 if ((uaa->info.bInterfaceClass == UICLASS_AUDIO) && 278 (uaa->info.bInterfaceSubClass == UISUBCLASS_AUDIOCONTROL)) 279 return (0); 280 281 return (ENXIO); 282 } 283 284 static int 285 g_audio_attach(device_t dev) 286 { 287 struct g_audio_softc *sc = device_get_softc(dev); 288 struct usb_attach_arg *uaa = device_get_ivars(dev); 289 int error; 290 int i; 291 uint8_t iface_index[3]; 292 293 DPRINTFN(11, "\n"); 294 295 device_set_usb_desc(dev); 296 297 mtx_init(&sc->sc_mtx, "g_audio", NULL, MTX_DEF); 298 299 usb_callout_init_mtx(&sc->sc_callout, &sc->sc_mtx, 0); 300 usb_callout_init_mtx(&sc->sc_watchdog, &sc->sc_mtx, 0); 301 302 sc->sc_mode = G_AUDIO_MODE_SILENT; 303 304 sc->sc_noise_rem = 1; 305 306 for (i = 0; i != G_AUDIO_FRAMES; i++) { 307 sc->sc_data_len[0][i] = G_AUDIO_BUFSIZE / G_AUDIO_FRAMES; 308 sc->sc_data_len[1][i] = G_AUDIO_BUFSIZE / G_AUDIO_FRAMES; 309 } 310 311 iface_index[0] = uaa->info.bIfaceIndex; 312 iface_index[1] = uaa->info.bIfaceIndex + 1; 313 iface_index[2] = uaa->info.bIfaceIndex + 2; 314 315 error = usbd_set_alt_interface_index(uaa->device, iface_index[1], 1); 316 if (error) { 317 DPRINTF("alt iface setting error=%s\n", usbd_errstr(error)); 318 goto detach; 319 } 320 error = usbd_set_alt_interface_index(uaa->device, iface_index[2], 1); 321 if (error) { 322 DPRINTF("alt iface setting error=%s\n", usbd_errstr(error)); 323 goto detach; 324 } 325 error = usbd_transfer_setup(uaa->device, 326 iface_index, sc->sc_xfer, g_audio_config, 327 G_AUDIO_N_TRANSFER, sc, &sc->sc_mtx); 328 329 if (error) { 330 DPRINTF("error=%s\n", usbd_errstr(error)); 331 goto detach; 332 } 333 usbd_set_parent_iface(uaa->device, iface_index[1], iface_index[0]); 334 usbd_set_parent_iface(uaa->device, iface_index[2], iface_index[0]); 335 336 mtx_lock(&sc->sc_mtx); 337 338 usbd_transfer_start(sc->sc_xfer[G_AUDIO_ISOC0_RD]); 339 usbd_transfer_start(sc->sc_xfer[G_AUDIO_ISOC1_RD]); 340 341 usbd_transfer_start(sc->sc_xfer[G_AUDIO_ISOC0_WR]); 342 usbd_transfer_start(sc->sc_xfer[G_AUDIO_ISOC1_WR]); 343 344 g_audio_timeout_reset(sc); 345 346 g_audio_watchdog_reset(sc); 347 348 mtx_unlock(&sc->sc_mtx); 349 350 return (0); /* success */ 351 352 detach: 353 g_audio_detach(dev); 354 355 return (ENXIO); /* error */ 356 } 357 358 static int 359 g_audio_detach(device_t dev) 360 { 361 struct g_audio_softc *sc = device_get_softc(dev); 362 363 DPRINTF("\n"); 364 365 mtx_lock(&sc->sc_mtx); 366 usb_callout_stop(&sc->sc_callout); 367 usb_callout_stop(&sc->sc_watchdog); 368 mtx_unlock(&sc->sc_mtx); 369 370 usbd_transfer_unsetup(sc->sc_xfer, G_AUDIO_N_TRANSFER); 371 372 usb_callout_drain(&sc->sc_callout); 373 usb_callout_drain(&sc->sc_watchdog); 374 375 mtx_destroy(&sc->sc_mtx); 376 377 return (0); 378 } 379 380 static int32_t 381 g_noise(struct g_audio_softc *sc) 382 { 383 uint32_t temp; 384 const uint32_t prime = 0xFFFF1D; 385 386 if (sc->sc_noise_rem & 1) { 387 sc->sc_noise_rem += prime; 388 } 389 sc->sc_noise_rem /= 2; 390 391 temp = sc->sc_noise_rem; 392 393 /* unsigned to signed conversion */ 394 395 temp ^= 0x800000; 396 if (temp & 0x800000) { 397 temp |= (-0x800000); 398 } 399 return temp; 400 } 401 402 static void 403 g_audio_make_samples(struct g_audio_softc *sc, int16_t *ptr, int samples) 404 { 405 int i; 406 int j; 407 408 for (i = 0; i != samples; i++) { 409 j = g_noise(sc); 410 411 if ((sc->sc_state < 0) || (sc->sc_state >= sc->sc_pattern_len)) 412 sc->sc_state = 0; 413 414 if (sc->sc_pattern_len != 0) { 415 j = (j * sc->sc_pattern[sc->sc_state]) >> 16; 416 sc->sc_state++; 417 } 418 *ptr++ = j / 256; 419 *ptr++ = j / 256; 420 } 421 } 422 423 static void 424 g_audio_isoc_write_callback(struct usb_xfer *xfer, usb_error_t error) 425 { 426 struct g_audio_softc *sc = usbd_xfer_softc(xfer); 427 int actlen; 428 int aframes; 429 int nr = (xfer == sc->sc_xfer[G_AUDIO_ISOC0_WR]) ? 0 : 1; 430 int16_t *ptr; 431 int i; 432 433 usbd_xfer_status(xfer, &actlen, NULL, &aframes, NULL); 434 435 DPRINTF("st=%d aframes=%d actlen=%d bytes\n", 436 USB_GET_STATE(xfer), aframes, actlen); 437 438 switch (USB_GET_STATE(xfer)) { 439 case USB_ST_TRANSFERRED: 440 441 sc->sc_throughput += actlen; 442 443 if (sc->sc_mode == G_AUDIO_MODE_LOOP) 444 break; /* sync with RX */ 445 446 case USB_ST_SETUP: 447 tr_setup: 448 449 ptr = sc->sc_data_buf[nr]; 450 451 if (sc->sc_mode == G_AUDIO_MODE_PATTERN) { 452 for (i = 0; i != G_AUDIO_FRAMES; i++) { 453 usbd_xfer_set_frame_data(xfer, i, ptr, sc->sc_data_len[nr][i]); 454 455 g_audio_make_samples(sc, ptr, (G_AUDIO_BUFSIZE / G_AUDIO_FRAMES) / 2); 456 457 ptr += (G_AUDIO_BUFSIZE / G_AUDIO_FRAMES) / 2; 458 } 459 } else if (sc->sc_mode == G_AUDIO_MODE_LOOP) { 460 for (i = 0; i != G_AUDIO_FRAMES; i++) { 461 usbd_xfer_set_frame_data(xfer, i, ptr, sc->sc_data_len[nr][i] & ~3); 462 463 g_audio_make_samples(sc, ptr, sc->sc_data_len[nr][i] / 4); 464 465 ptr += (G_AUDIO_BUFSIZE / G_AUDIO_FRAMES) / 2; 466 } 467 } 468 break; 469 470 default: /* Error */ 471 DPRINTF("error=%s\n", usbd_errstr(error)); 472 473 if (error != USB_ERR_CANCELLED) { 474 /* try to clear stall first */ 475 usbd_xfer_set_stall(xfer); 476 goto tr_setup; 477 } 478 break; 479 } 480 } 481 482 static void 483 g_audio_isoc_read_callback(struct usb_xfer *xfer, usb_error_t error) 484 { 485 struct g_audio_softc *sc = usbd_xfer_softc(xfer); 486 int actlen; 487 int aframes; 488 int nr = (xfer == sc->sc_xfer[G_AUDIO_ISOC0_RD]) ? 0 : 1; 489 int16_t *ptr; 490 int i; 491 492 usbd_xfer_status(xfer, &actlen, NULL, &aframes, NULL); 493 494 DPRINTF("st=%d aframes=%d actlen=%d bytes\n", 495 USB_GET_STATE(xfer), aframes, actlen); 496 497 switch (USB_GET_STATE(xfer)) { 498 case USB_ST_TRANSFERRED: 499 500 sc->sc_throughput += actlen; 501 502 for (i = 0; i != G_AUDIO_FRAMES; i++) { 503 sc->sc_data_len[nr][i] = usbd_xfer_frame_len(xfer, i); 504 } 505 506 usbd_transfer_start(sc->sc_xfer[G_AUDIO_ISOC0_WR]); 507 usbd_transfer_start(sc->sc_xfer[G_AUDIO_ISOC1_WR]); 508 509 break; 510 511 case USB_ST_SETUP: 512 tr_setup: 513 ptr = sc->sc_data_buf[nr]; 514 515 for (i = 0; i != G_AUDIO_FRAMES; i++) { 516 usbd_xfer_set_frame_data(xfer, i, ptr, 517 G_AUDIO_BUFSIZE / G_AUDIO_FRAMES); 518 519 ptr += (G_AUDIO_BUFSIZE / G_AUDIO_FRAMES) / 2; 520 } 521 522 usbd_transfer_submit(xfer); 523 break; 524 525 default: /* Error */ 526 DPRINTF("error=%s\n", usbd_errstr(error)); 527 528 if (error != USB_ERR_CANCELLED) { 529 /* try to clear stall first */ 530 usbd_xfer_set_stall(xfer); 531 goto tr_setup; 532 } 533 break; 534 } 535 } 536 537 static int 538 g_audio_handle_request(device_t dev, 539 const void *preq, void **pptr, uint16_t *plen, 540 uint16_t offset, uint8_t *pstate) 541 { 542 struct g_audio_softc *sc = device_get_softc(dev); 543 const struct usb_device_request *req = preq; 544 uint8_t is_complete = *pstate; 545 546 if (!is_complete) { 547 if ((req->bmRequestType == UT_READ_CLASS_INTERFACE) && 548 (req->bRequest == 0x82 /* get min */ )) { 549 if (offset == 0) { 550 USETW(sc->sc_volume_limit, 0); 551 *plen = 2; 552 *pptr = &sc->sc_volume_limit; 553 } else { 554 *plen = 0; 555 } 556 return (0); 557 } else if ((req->bmRequestType == UT_READ_CLASS_INTERFACE) && 558 (req->bRequest == 0x83 /* get max */ )) { 559 if (offset == 0) { 560 USETW(sc->sc_volume_limit, 0x2000); 561 *plen = 2; 562 *pptr = &sc->sc_volume_limit; 563 } else { 564 *plen = 0; 565 } 566 return (0); 567 } else if ((req->bmRequestType == UT_READ_CLASS_INTERFACE) && 568 (req->bRequest == 0x84 /* get residue */ )) { 569 if (offset == 0) { 570 USETW(sc->sc_volume_limit, 1); 571 *plen = 2; 572 *pptr = &sc->sc_volume_limit; 573 } else { 574 *plen = 0; 575 } 576 return (0); 577 } else if ((req->bmRequestType == UT_READ_CLASS_INTERFACE) && 578 (req->bRequest == 0x81 /* get value */ )) { 579 if (offset == 0) { 580 USETW(sc->sc_volume_setting, 0x2000); 581 *plen = sizeof(sc->sc_volume_setting); 582 *pptr = &sc->sc_volume_setting; 583 } else { 584 *plen = 0; 585 } 586 return (0); 587 } else if ((req->bmRequestType == UT_WRITE_CLASS_INTERFACE) && 588 (req->bRequest == 0x01 /* set value */ )) { 589 if (offset == 0) { 590 *plen = sizeof(sc->sc_volume_setting); 591 *pptr = &sc->sc_volume_setting; 592 } else { 593 *plen = 0; 594 } 595 return (0); 596 } else if ((req->bmRequestType == UT_WRITE_CLASS_ENDPOINT) && 597 (req->bRequest == 0x01 /* set value */ )) { 598 if (offset == 0) { 599 *plen = sizeof(sc->sc_sample_rate); 600 *pptr = &sc->sc_sample_rate; 601 } else { 602 *plen = 0; 603 } 604 return (0); 605 } 606 } 607 return (ENXIO); /* use builtin handler */ 608 } 609