Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/dev/usb/usb_hub.c
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1 /* $FreeBSD: releng/8.1/sys/dev/usb/usb_hub.c 208223 2010-05-17 23:46:45Z thompsa $ */ 2 /*- 3 * Copyright (c) 1998 The NetBSD Foundation, Inc. All rights reserved. 4 * Copyright (c) 1998 Lennart Augustsson. All rights reserved. 5 * Copyright (c) 2008 Hans Petter Selasky. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * USB spec: http://www.usb.org/developers/docs/usbspec.zip 31 */ 32 33 #include <sys/stdint.h> 34 #include <sys/stddef.h> 35 #include <sys/param.h> 36 #include <sys/queue.h> 37 #include <sys/types.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_ioctl.h> 55 #include <dev/usb/usbdi.h> 56 57 #define USB_DEBUG_VAR uhub_debug 58 59 #include <dev/usb/usb_core.h> 60 #include <dev/usb/usb_process.h> 61 #include <dev/usb/usb_device.h> 62 #include <dev/usb/usb_request.h> 63 #include <dev/usb/usb_debug.h> 64 #include <dev/usb/usb_hub.h> 65 #include <dev/usb/usb_util.h> 66 #include <dev/usb/usb_busdma.h> 67 #include <dev/usb/usb_transfer.h> 68 #include <dev/usb/usb_dynamic.h> 69 70 #include <dev/usb/usb_controller.h> 71 #include <dev/usb/usb_bus.h> 72 73 #define UHUB_INTR_INTERVAL 250 /* ms */ 74 #define UHUB_N_TRANSFER 1 75 76 #ifdef USB_DEBUG 77 static int uhub_debug = 0; 78 79 SYSCTL_NODE(_hw_usb, OID_AUTO, uhub, CTLFLAG_RW, 0, "USB HUB"); 80 SYSCTL_INT(_hw_usb_uhub, OID_AUTO, debug, CTLFLAG_RW, &uhub_debug, 0, 81 "Debug level"); 82 83 TUNABLE_INT("hw.usb.uhub.debug", &uhub_debug); 84 #endif 85 86 #if USB_HAVE_POWERD 87 static int usb_power_timeout = 30; /* seconds */ 88 89 SYSCTL_INT(_hw_usb, OID_AUTO, power_timeout, CTLFLAG_RW, 90 &usb_power_timeout, 0, "USB power timeout"); 91 #endif 92 93 struct uhub_current_state { 94 uint16_t port_change; 95 uint16_t port_status; 96 }; 97 98 struct uhub_softc { 99 struct uhub_current_state sc_st;/* current state */ 100 device_t sc_dev; /* base device */ 101 struct mtx sc_mtx; /* our mutex */ 102 struct usb_device *sc_udev; /* USB device */ 103 struct usb_xfer *sc_xfer[UHUB_N_TRANSFER]; /* interrupt xfer */ 104 uint8_t sc_flags; 105 #define UHUB_FLAG_DID_EXPLORE 0x01 106 char sc_name[32]; 107 }; 108 109 #define UHUB_PROTO(sc) ((sc)->sc_udev->ddesc.bDeviceProtocol) 110 #define UHUB_IS_HIGH_SPEED(sc) (UHUB_PROTO(sc) != UDPROTO_FSHUB) 111 #define UHUB_IS_SINGLE_TT(sc) (UHUB_PROTO(sc) == UDPROTO_HSHUBSTT) 112 113 /* prototypes for type checking: */ 114 115 static device_probe_t uhub_probe; 116 static device_attach_t uhub_attach; 117 static device_detach_t uhub_detach; 118 static device_suspend_t uhub_suspend; 119 static device_resume_t uhub_resume; 120 121 static bus_driver_added_t uhub_driver_added; 122 static bus_child_location_str_t uhub_child_location_string; 123 static bus_child_pnpinfo_str_t uhub_child_pnpinfo_string; 124 125 static usb_callback_t uhub_intr_callback; 126 127 static void usb_dev_resume_peer(struct usb_device *udev); 128 static void usb_dev_suspend_peer(struct usb_device *udev); 129 static uint8_t usb_peer_should_wakeup(struct usb_device *udev); 130 131 static const struct usb_config uhub_config[UHUB_N_TRANSFER] = { 132 133 [0] = { 134 .type = UE_INTERRUPT, 135 .endpoint = UE_ADDR_ANY, 136 .direction = UE_DIR_ANY, 137 .timeout = 0, 138 .flags = {.pipe_bof = 1,.short_xfer_ok = 1,}, 139 .bufsize = 0, /* use wMaxPacketSize */ 140 .callback = &uhub_intr_callback, 141 .interval = UHUB_INTR_INTERVAL, 142 }, 143 }; 144 145 /* 146 * driver instance for "hub" connected to "usb" 147 * and "hub" connected to "hub" 148 */ 149 static devclass_t uhub_devclass; 150 151 static device_method_t uhub_methods[] = { 152 DEVMETHOD(device_probe, uhub_probe), 153 DEVMETHOD(device_attach, uhub_attach), 154 DEVMETHOD(device_detach, uhub_detach), 155 156 DEVMETHOD(device_suspend, uhub_suspend), 157 DEVMETHOD(device_resume, uhub_resume), 158 159 DEVMETHOD(bus_child_location_str, uhub_child_location_string), 160 DEVMETHOD(bus_child_pnpinfo_str, uhub_child_pnpinfo_string), 161 DEVMETHOD(bus_driver_added, uhub_driver_added), 162 {0, 0} 163 }; 164 165 static driver_t uhub_driver = { 166 .name = "uhub", 167 .methods = uhub_methods, 168 .size = sizeof(struct uhub_softc) 169 }; 170 171 DRIVER_MODULE(uhub, usbus, uhub_driver, uhub_devclass, 0, 0); 172 DRIVER_MODULE(uhub, uhub, uhub_driver, uhub_devclass, NULL, 0); 173 174 static void 175 uhub_intr_callback(struct usb_xfer *xfer, usb_error_t error) 176 { 177 struct uhub_softc *sc = usbd_xfer_softc(xfer); 178 179 switch (USB_GET_STATE(xfer)) { 180 case USB_ST_TRANSFERRED: 181 DPRINTFN(2, "\n"); 182 /* 183 * This is an indication that some port 184 * has changed status. Notify the bus 185 * event handler thread that we need 186 * to be explored again: 187 */ 188 usb_needs_explore(sc->sc_udev->bus, 0); 189 190 case USB_ST_SETUP: 191 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer)); 192 usbd_transfer_submit(xfer); 193 break; 194 195 default: /* Error */ 196 if (xfer->error != USB_ERR_CANCELLED) { 197 /* 198 * Do a clear-stall. The "stall_pipe" flag 199 * will get cleared before next callback by 200 * the USB stack. 201 */ 202 usbd_xfer_set_stall(xfer); 203 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer)); 204 usbd_transfer_submit(xfer); 205 } 206 break; 207 } 208 } 209 210 /*------------------------------------------------------------------------* 211 * uhub_explore_sub - subroutine 212 * 213 * Return values: 214 * 0: Success 215 * Else: A control transaction failed 216 *------------------------------------------------------------------------*/ 217 static usb_error_t 218 uhub_explore_sub(struct uhub_softc *sc, struct usb_port *up) 219 { 220 struct usb_bus *bus; 221 struct usb_device *child; 222 uint8_t refcount; 223 usb_error_t err; 224 225 bus = sc->sc_udev->bus; 226 err = 0; 227 228 /* get driver added refcount from USB bus */ 229 refcount = bus->driver_added_refcount; 230 231 /* get device assosiated with the given port */ 232 child = usb_bus_port_get_device(bus, up); 233 if (child == NULL) { 234 /* nothing to do */ 235 goto done; 236 } 237 /* check if probe and attach should be done */ 238 239 if (child->driver_added_refcount != refcount) { 240 child->driver_added_refcount = refcount; 241 err = usb_probe_and_attach(child, 242 USB_IFACE_INDEX_ANY); 243 if (err) { 244 goto done; 245 } 246 } 247 /* start control transfer, if device mode */ 248 249 if (child->flags.usb_mode == USB_MODE_DEVICE) { 250 usbd_ctrl_transfer_setup(child); 251 } 252 /* if a HUB becomes present, do a recursive HUB explore */ 253 254 if (child->hub) { 255 err = (child->hub->explore) (child); 256 } 257 done: 258 return (err); 259 } 260 261 /*------------------------------------------------------------------------* 262 * uhub_read_port_status - factored out code 263 *------------------------------------------------------------------------*/ 264 static usb_error_t 265 uhub_read_port_status(struct uhub_softc *sc, uint8_t portno) 266 { 267 struct usb_port_status ps; 268 usb_error_t err; 269 270 err = usbd_req_get_port_status( 271 sc->sc_udev, NULL, &ps, portno); 272 273 /* update status regardless of error */ 274 275 sc->sc_st.port_status = UGETW(ps.wPortStatus); 276 sc->sc_st.port_change = UGETW(ps.wPortChange); 277 278 /* debugging print */ 279 280 DPRINTFN(4, "port %d, wPortStatus=0x%04x, " 281 "wPortChange=0x%04x, err=%s\n", 282 portno, sc->sc_st.port_status, 283 sc->sc_st.port_change, usbd_errstr(err)); 284 return (err); 285 } 286 287 /*------------------------------------------------------------------------* 288 * uhub_reattach_port 289 * 290 * Returns: 291 * 0: Success 292 * Else: A control transaction failed 293 *------------------------------------------------------------------------*/ 294 static usb_error_t 295 uhub_reattach_port(struct uhub_softc *sc, uint8_t portno) 296 { 297 struct usb_device *child; 298 struct usb_device *udev; 299 enum usb_dev_speed speed; 300 enum usb_hc_mode mode; 301 usb_error_t err; 302 uint8_t timeout; 303 304 DPRINTF("reattaching port %d\n", portno); 305 306 err = 0; 307 timeout = 0; 308 udev = sc->sc_udev; 309 child = usb_bus_port_get_device(udev->bus, 310 udev->hub->ports + portno - 1); 311 312 repeat: 313 314 /* first clear the port connection change bit */ 315 316 err = usbd_req_clear_port_feature(udev, NULL, 317 portno, UHF_C_PORT_CONNECTION); 318 319 if (err) { 320 goto error; 321 } 322 /* check if there is a child */ 323 324 if (child != NULL) { 325 /* 326 * Free USB device and all subdevices, if any. 327 */ 328 usb_free_device(child, 0); 329 child = NULL; 330 } 331 /* get fresh status */ 332 333 err = uhub_read_port_status(sc, portno); 334 if (err) { 335 goto error; 336 } 337 /* check if nothing is connected to the port */ 338 339 if (!(sc->sc_st.port_status & UPS_CURRENT_CONNECT_STATUS)) { 340 goto error; 341 } 342 /* check if there is no power on the port and print a warning */ 343 344 if (!(sc->sc_st.port_status & UPS_PORT_POWER)) { 345 DPRINTF("WARNING: strange, connected port %d " 346 "has no power\n", portno); 347 } 348 /* check if the device is in Host Mode */ 349 350 if (!(sc->sc_st.port_status & UPS_PORT_MODE_DEVICE)) { 351 352 DPRINTF("Port %d is in Host Mode\n", portno); 353 354 if (sc->sc_st.port_status & UPS_SUSPEND) { 355 DPRINTF("Port %d was still " 356 "suspended, clearing.\n", portno); 357 err = usbd_req_clear_port_feature(sc->sc_udev, 358 NULL, portno, UHF_PORT_SUSPEND); 359 } 360 /* USB Host Mode */ 361 362 /* wait for maximum device power up time */ 363 364 usb_pause_mtx(NULL, 365 USB_MS_TO_TICKS(USB_PORT_POWERUP_DELAY)); 366 367 /* reset port, which implies enabling it */ 368 369 err = usbd_req_reset_port(udev, NULL, portno); 370 371 if (err) { 372 DPRINTFN(0, "port %d reset " 373 "failed, error=%s\n", 374 portno, usbd_errstr(err)); 375 goto error; 376 } 377 /* get port status again, it might have changed during reset */ 378 379 err = uhub_read_port_status(sc, portno); 380 if (err) { 381 goto error; 382 } 383 /* check if something changed during port reset */ 384 385 if ((sc->sc_st.port_change & UPS_C_CONNECT_STATUS) || 386 (!(sc->sc_st.port_status & UPS_CURRENT_CONNECT_STATUS))) { 387 if (timeout) { 388 DPRINTFN(0, "giving up port reset " 389 "- device vanished\n"); 390 goto error; 391 } 392 timeout = 1; 393 goto repeat; 394 } 395 } else { 396 DPRINTF("Port %d is in Device Mode\n", portno); 397 } 398 399 /* 400 * Figure out the device speed 401 */ 402 switch (udev->speed) { 403 case USB_SPEED_HIGH: 404 if (sc->sc_st.port_status & UPS_HIGH_SPEED) 405 speed = USB_SPEED_HIGH; 406 else if (sc->sc_st.port_status & UPS_LOW_SPEED) 407 speed = USB_SPEED_LOW; 408 else 409 speed = USB_SPEED_FULL; 410 break; 411 case USB_SPEED_FULL: 412 if (sc->sc_st.port_status & UPS_LOW_SPEED) 413 speed = USB_SPEED_LOW; 414 else 415 speed = USB_SPEED_FULL; 416 break; 417 case USB_SPEED_LOW: 418 speed = USB_SPEED_LOW; 419 break; 420 default: 421 /* same speed like parent */ 422 speed = udev->speed; 423 break; 424 } 425 /* 426 * Figure out the device mode 427 * 428 * NOTE: This part is currently FreeBSD specific. 429 */ 430 if (sc->sc_st.port_status & UPS_PORT_MODE_DEVICE) 431 mode = USB_MODE_DEVICE; 432 else 433 mode = USB_MODE_HOST; 434 435 /* need to create a new child */ 436 child = usb_alloc_device(sc->sc_dev, udev->bus, udev, 437 udev->depth + 1, portno - 1, portno, speed, mode); 438 if (child == NULL) { 439 DPRINTFN(0, "could not allocate new device\n"); 440 goto error; 441 } 442 return (0); /* success */ 443 444 error: 445 if (child != NULL) { 446 /* 447 * Free USB device and all subdevices, if any. 448 */ 449 usb_free_device(child, 0); 450 child = NULL; 451 } 452 if (err == 0) { 453 if (sc->sc_st.port_status & UPS_PORT_ENABLED) { 454 err = usbd_req_clear_port_feature( 455 sc->sc_udev, NULL, 456 portno, UHF_PORT_ENABLE); 457 } 458 } 459 if (err) { 460 DPRINTFN(0, "device problem (%s), " 461 "disabling port %d\n", usbd_errstr(err), portno); 462 } 463 return (err); 464 } 465 466 /*------------------------------------------------------------------------* 467 * uhub_suspend_resume_port 468 * 469 * Returns: 470 * 0: Success 471 * Else: A control transaction failed 472 *------------------------------------------------------------------------*/ 473 static usb_error_t 474 uhub_suspend_resume_port(struct uhub_softc *sc, uint8_t portno) 475 { 476 struct usb_device *child; 477 struct usb_device *udev; 478 uint8_t is_suspend; 479 usb_error_t err; 480 481 DPRINTF("port %d\n", portno); 482 483 udev = sc->sc_udev; 484 child = usb_bus_port_get_device(udev->bus, 485 udev->hub->ports + portno - 1); 486 487 /* first clear the port suspend change bit */ 488 489 err = usbd_req_clear_port_feature(udev, NULL, 490 portno, UHF_C_PORT_SUSPEND); 491 if (err) { 492 DPRINTF("clearing suspend failed.\n"); 493 goto done; 494 } 495 /* get fresh status */ 496 497 err = uhub_read_port_status(sc, portno); 498 if (err) { 499 DPRINTF("reading port status failed.\n"); 500 goto done; 501 } 502 /* get current state */ 503 504 if (sc->sc_st.port_status & UPS_SUSPEND) { 505 is_suspend = 1; 506 } else { 507 is_suspend = 0; 508 } 509 510 DPRINTF("suspended=%u\n", is_suspend); 511 512 /* do the suspend or resume */ 513 514 if (child) { 515 /* 516 * This code handle two cases: 1) Host Mode - we can only 517 * receive resume here 2) Device Mode - we can receive 518 * suspend and resume here 519 */ 520 if (is_suspend == 0) 521 usb_dev_resume_peer(child); 522 else if (child->flags.usb_mode == USB_MODE_DEVICE) 523 usb_dev_suspend_peer(child); 524 } 525 done: 526 return (err); 527 } 528 529 /*------------------------------------------------------------------------* 530 * uhub_root_interrupt 531 * 532 * This function is called when a Root HUB interrupt has 533 * happened. "ptr" and "len" makes up the Root HUB interrupt 534 * packet. This function is called having the "bus_mtx" locked. 535 *------------------------------------------------------------------------*/ 536 void 537 uhub_root_intr(struct usb_bus *bus, const uint8_t *ptr, uint8_t len) 538 { 539 USB_BUS_LOCK_ASSERT(bus, MA_OWNED); 540 541 usb_needs_explore(bus, 0); 542 } 543 544 /*------------------------------------------------------------------------* 545 * uhub_explore 546 * 547 * Returns: 548 * 0: Success 549 * Else: Failure 550 *------------------------------------------------------------------------*/ 551 static usb_error_t 552 uhub_explore(struct usb_device *udev) 553 { 554 struct usb_hub *hub; 555 struct uhub_softc *sc; 556 struct usb_port *up; 557 usb_error_t err; 558 uint8_t portno; 559 uint8_t x; 560 561 hub = udev->hub; 562 sc = hub->hubsoftc; 563 564 DPRINTFN(11, "udev=%p addr=%d\n", udev, udev->address); 565 566 /* ignore hubs that are too deep */ 567 if (udev->depth > USB_HUB_MAX_DEPTH) { 568 return (USB_ERR_TOO_DEEP); 569 } 570 571 if (udev->flags.self_suspended) { 572 /* need to wait until the child signals resume */ 573 DPRINTF("Device is suspended!\n"); 574 return (0); 575 } 576 for (x = 0; x != hub->nports; x++) { 577 up = hub->ports + x; 578 portno = x + 1; 579 580 err = uhub_read_port_status(sc, portno); 581 if (err) { 582 /* most likely the HUB is gone */ 583 break; 584 } 585 if (sc->sc_st.port_change & UPS_C_OVERCURRENT_INDICATOR) { 586 DPRINTF("Overcurrent on port %u.\n", portno); 587 err = usbd_req_clear_port_feature( 588 udev, NULL, portno, UHF_C_PORT_OVER_CURRENT); 589 if (err) { 590 /* most likely the HUB is gone */ 591 break; 592 } 593 } 594 if (!(sc->sc_flags & UHUB_FLAG_DID_EXPLORE)) { 595 /* 596 * Fake a connect status change so that the 597 * status gets checked initially! 598 */ 599 sc->sc_st.port_change |= 600 UPS_C_CONNECT_STATUS; 601 } 602 if (sc->sc_st.port_change & UPS_C_PORT_ENABLED) { 603 err = usbd_req_clear_port_feature( 604 udev, NULL, portno, UHF_C_PORT_ENABLE); 605 if (err) { 606 /* most likely the HUB is gone */ 607 break; 608 } 609 if (sc->sc_st.port_change & UPS_C_CONNECT_STATUS) { 610 /* 611 * Ignore the port error if the device 612 * has vanished ! 613 */ 614 } else if (sc->sc_st.port_status & UPS_PORT_ENABLED) { 615 DPRINTFN(0, "illegal enable change, " 616 "port %d\n", portno); 617 } else { 618 619 if (up->restartcnt == USB_RESTART_MAX) { 620 /* XXX could try another speed ? */ 621 DPRINTFN(0, "port error, giving up " 622 "port %d\n", portno); 623 } else { 624 sc->sc_st.port_change |= 625 UPS_C_CONNECT_STATUS; 626 up->restartcnt++; 627 } 628 } 629 } 630 if (sc->sc_st.port_change & UPS_C_CONNECT_STATUS) { 631 err = uhub_reattach_port(sc, portno); 632 if (err) { 633 /* most likely the HUB is gone */ 634 break; 635 } 636 } 637 if (sc->sc_st.port_change & UPS_C_SUSPEND) { 638 err = uhub_suspend_resume_port(sc, portno); 639 if (err) { 640 /* most likely the HUB is gone */ 641 break; 642 } 643 } 644 err = uhub_explore_sub(sc, up); 645 if (err) { 646 /* no device(s) present */ 647 continue; 648 } 649 /* explore succeeded - reset restart counter */ 650 up->restartcnt = 0; 651 } 652 653 /* initial status checked */ 654 sc->sc_flags |= UHUB_FLAG_DID_EXPLORE; 655 656 /* return success */ 657 return (USB_ERR_NORMAL_COMPLETION); 658 } 659 660 static int 661 uhub_probe(device_t dev) 662 { 663 struct usb_attach_arg *uaa = device_get_ivars(dev); 664 665 if (uaa->usb_mode != USB_MODE_HOST) { 666 return (ENXIO); 667 } 668 /* 669 * The subclass for USB HUBs is ignored because it is 0 for 670 * some and 1 for others. 671 */ 672 if ((uaa->info.bConfigIndex == 0) && 673 (uaa->info.bDeviceClass == UDCLASS_HUB)) { 674 return (0); 675 } 676 return (ENXIO); 677 } 678 679 static int 680 uhub_attach(device_t dev) 681 { 682 struct uhub_softc *sc = device_get_softc(dev); 683 struct usb_attach_arg *uaa = device_get_ivars(dev); 684 struct usb_device *udev = uaa->device; 685 struct usb_device *parent_hub = udev->parent_hub; 686 struct usb_hub *hub; 687 struct usb_hub_descriptor hubdesc; 688 uint16_t pwrdly; 689 uint8_t x; 690 uint8_t nports; 691 uint8_t portno; 692 uint8_t removable; 693 uint8_t iface_index; 694 usb_error_t err; 695 696 sc->sc_udev = udev; 697 sc->sc_dev = dev; 698 699 mtx_init(&sc->sc_mtx, "USB HUB mutex", NULL, MTX_DEF); 700 701 snprintf(sc->sc_name, sizeof(sc->sc_name), "%s", 702 device_get_nameunit(dev)); 703 704 device_set_usb_desc(dev); 705 706 DPRINTFN(2, "depth=%d selfpowered=%d, parent=%p, " 707 "parent->selfpowered=%d\n", 708 udev->depth, 709 udev->flags.self_powered, 710 parent_hub, 711 parent_hub ? 712 parent_hub->flags.self_powered : 0); 713 714 if (udev->depth > USB_HUB_MAX_DEPTH) { 715 DPRINTFN(0, "hub depth, %d, exceeded. HUB ignored\n", 716 USB_HUB_MAX_DEPTH); 717 goto error; 718 } 719 if (!udev->flags.self_powered && parent_hub && 720 (!parent_hub->flags.self_powered)) { 721 DPRINTFN(0, "bus powered HUB connected to " 722 "bus powered HUB. HUB ignored\n"); 723 goto error; 724 } 725 /* get HUB descriptor */ 726 727 DPRINTFN(2, "getting HUB descriptor\n"); 728 729 /* assuming that there is one port */ 730 err = usbd_req_get_hub_descriptor(udev, NULL, &hubdesc, 1); 731 732 nports = hubdesc.bNbrPorts; 733 734 if (!err && (nports >= 8)) { 735 /* get complete HUB descriptor */ 736 err = usbd_req_get_hub_descriptor(udev, NULL, &hubdesc, nports); 737 } 738 if (err) { 739 DPRINTFN(0, "getting hub descriptor failed," 740 "error=%s\n", usbd_errstr(err)); 741 goto error; 742 } 743 if (hubdesc.bNbrPorts != nports) { 744 DPRINTFN(0, "number of ports changed\n"); 745 goto error; 746 } 747 if (nports == 0) { 748 DPRINTFN(0, "portless HUB\n"); 749 goto error; 750 } 751 hub = malloc(sizeof(hub[0]) + (sizeof(hub->ports[0]) * nports), 752 M_USBDEV, M_WAITOK | M_ZERO); 753 754 if (hub == NULL) { 755 goto error; 756 } 757 udev->hub = hub; 758 759 #if USB_HAVE_TT_SUPPORT 760 /* init FULL-speed ISOCHRONOUS schedule */ 761 usbd_fs_isoc_schedule_init_all(hub->fs_isoc_schedule); 762 #endif 763 /* initialize HUB structure */ 764 hub->hubsoftc = sc; 765 hub->explore = &uhub_explore; 766 hub->nports = hubdesc.bNbrPorts; 767 hub->hubudev = udev; 768 769 /* if self powered hub, give ports maximum current */ 770 if (udev->flags.self_powered) { 771 hub->portpower = USB_MAX_POWER; 772 } else { 773 hub->portpower = USB_MIN_POWER; 774 } 775 776 /* set up interrupt pipe */ 777 iface_index = 0; 778 if (udev->parent_hub == NULL) { 779 /* root HUB is special */ 780 err = 0; 781 } else { 782 /* normal HUB */ 783 err = usbd_transfer_setup(udev, &iface_index, sc->sc_xfer, 784 uhub_config, UHUB_N_TRANSFER, sc, &sc->sc_mtx); 785 } 786 if (err) { 787 DPRINTFN(0, "cannot setup interrupt transfer, " 788 "errstr=%s\n", usbd_errstr(err)); 789 goto error; 790 } 791 /* wait with power off for a while */ 792 usb_pause_mtx(NULL, USB_MS_TO_TICKS(USB_POWER_DOWN_TIME)); 793 794 /* 795 * To have the best chance of success we do things in the exact same 796 * order as Windoze98. This should not be necessary, but some 797 * devices do not follow the USB specs to the letter. 798 * 799 * These are the events on the bus when a hub is attached: 800 * Get device and config descriptors (see attach code) 801 * Get hub descriptor (see above) 802 * For all ports 803 * turn on power 804 * wait for power to become stable 805 * (all below happens in explore code) 806 * For all ports 807 * clear C_PORT_CONNECTION 808 * For all ports 809 * get port status 810 * if device connected 811 * wait 100 ms 812 * turn on reset 813 * wait 814 * clear C_PORT_RESET 815 * get port status 816 * proceed with device attachment 817 */ 818 819 /* XXX should check for none, individual, or ganged power? */ 820 821 removable = 0; 822 pwrdly = ((hubdesc.bPwrOn2PwrGood * UHD_PWRON_FACTOR) + 823 USB_EXTRA_POWER_UP_TIME); 824 825 for (x = 0; x != nports; x++) { 826 /* set up data structures */ 827 struct usb_port *up = hub->ports + x; 828 829 up->device_index = 0; 830 up->restartcnt = 0; 831 portno = x + 1; 832 833 /* check if port is removable */ 834 if (!UHD_NOT_REMOV(&hubdesc, portno)) { 835 removable++; 836 } 837 if (!err) { 838 /* turn the power on */ 839 err = usbd_req_set_port_feature(udev, NULL, 840 portno, UHF_PORT_POWER); 841 } 842 if (err) { 843 DPRINTFN(0, "port %d power on failed, %s\n", 844 portno, usbd_errstr(err)); 845 } 846 DPRINTF("turn on port %d power\n", 847 portno); 848 849 /* wait for stable power */ 850 usb_pause_mtx(NULL, USB_MS_TO_TICKS(pwrdly)); 851 } 852 853 device_printf(dev, "%d port%s with %d " 854 "removable, %s powered\n", nports, (nports != 1) ? "s" : "", 855 removable, udev->flags.self_powered ? "self" : "bus"); 856 857 /* Start the interrupt endpoint, if any */ 858 859 if (sc->sc_xfer[0] != NULL) { 860 mtx_lock(&sc->sc_mtx); 861 usbd_transfer_start(sc->sc_xfer[0]); 862 mtx_unlock(&sc->sc_mtx); 863 } 864 865 /* Enable automatic power save on all USB HUBs */ 866 867 usbd_set_power_mode(udev, USB_POWER_MODE_SAVE); 868 869 return (0); 870 871 error: 872 usbd_transfer_unsetup(sc->sc_xfer, UHUB_N_TRANSFER); 873 874 if (udev->hub) { 875 free(udev->hub, M_USBDEV); 876 udev->hub = NULL; 877 } 878 879 mtx_destroy(&sc->sc_mtx); 880 881 return (ENXIO); 882 } 883 884 /* 885 * Called from process context when the hub is gone. 886 * Detach all devices on active ports. 887 */ 888 static int 889 uhub_detach(device_t dev) 890 { 891 struct uhub_softc *sc = device_get_softc(dev); 892 struct usb_hub *hub = sc->sc_udev->hub; 893 struct usb_device *child; 894 uint8_t x; 895 896 if (hub == NULL) { /* must be partially working */ 897 return (0); 898 } 899 900 /* Make sure interrupt transfer is gone. */ 901 usbd_transfer_unsetup(sc->sc_xfer, UHUB_N_TRANSFER); 902 903 /* Detach all ports */ 904 for (x = 0; x != hub->nports; x++) { 905 906 child = usb_bus_port_get_device(sc->sc_udev->bus, hub->ports + x); 907 908 if (child == NULL) { 909 continue; 910 } 911 912 /* 913 * Free USB device and all subdevices, if any. 914 */ 915 usb_free_device(child, 0); 916 } 917 918 free(hub, M_USBDEV); 919 sc->sc_udev->hub = NULL; 920 921 mtx_destroy(&sc->sc_mtx); 922 923 return (0); 924 } 925 926 static int 927 uhub_suspend(device_t dev) 928 { 929 DPRINTF("\n"); 930 /* Sub-devices are not suspended here! */ 931 return (0); 932 } 933 934 static int 935 uhub_resume(device_t dev) 936 { 937 DPRINTF("\n"); 938 /* Sub-devices are not resumed here! */ 939 return (0); 940 } 941 942 static void 943 uhub_driver_added(device_t dev, driver_t *driver) 944 { 945 usb_needs_explore_all(); 946 } 947 948 struct hub_result { 949 struct usb_device *udev; 950 uint8_t portno; 951 uint8_t iface_index; 952 }; 953 954 static void 955 uhub_find_iface_index(struct usb_hub *hub, device_t child, 956 struct hub_result *res) 957 { 958 struct usb_interface *iface; 959 struct usb_device *udev; 960 uint8_t nports; 961 uint8_t x; 962 uint8_t i; 963 964 nports = hub->nports; 965 for (x = 0; x != nports; x++) { 966 udev = usb_bus_port_get_device(hub->hubudev->bus, 967 hub->ports + x); 968 if (!udev) { 969 continue; 970 } 971 for (i = 0; i != USB_IFACE_MAX; i++) { 972 iface = usbd_get_iface(udev, i); 973 if (iface && 974 (iface->subdev == child)) { 975 res->iface_index = i; 976 res->udev = udev; 977 res->portno = x + 1; 978 return; 979 } 980 } 981 } 982 res->iface_index = 0; 983 res->udev = NULL; 984 res->portno = 0; 985 } 986 987 static int 988 uhub_child_location_string(device_t parent, device_t child, 989 char *buf, size_t buflen) 990 { 991 struct uhub_softc *sc; 992 struct usb_hub *hub; 993 struct hub_result res; 994 995 if (!device_is_attached(parent)) { 996 if (buflen) 997 buf[0] = 0; 998 return (0); 999 } 1000 1001 sc = device_get_softc(parent); 1002 hub = sc->sc_udev->hub; 1003 1004 mtx_lock(&Giant); 1005 uhub_find_iface_index(hub, child, &res); 1006 if (!res.udev) { 1007 DPRINTF("device not on hub\n"); 1008 if (buflen) { 1009 buf[0] = '\0'; 1010 } 1011 goto done; 1012 } 1013 snprintf(buf, buflen, "bus=%u hubaddr=%u port=%u devaddr=%u interface=%u", 1014 (res.udev->parent_hub != NULL) ? res.udev->parent_hub->device_index : 0, 1015 res.portno, device_get_unit(res.udev->bus->bdev), 1016 res.udev->device_index, res.iface_index); 1017 done: 1018 mtx_unlock(&Giant); 1019 1020 return (0); 1021 } 1022 1023 static int 1024 uhub_child_pnpinfo_string(device_t parent, device_t child, 1025 char *buf, size_t buflen) 1026 { 1027 struct uhub_softc *sc; 1028 struct usb_hub *hub; 1029 struct usb_interface *iface; 1030 struct hub_result res; 1031 1032 if (!device_is_attached(parent)) { 1033 if (buflen) 1034 buf[0] = 0; 1035 return (0); 1036 } 1037 1038 sc = device_get_softc(parent); 1039 hub = sc->sc_udev->hub; 1040 1041 mtx_lock(&Giant); 1042 uhub_find_iface_index(hub, child, &res); 1043 if (!res.udev) { 1044 DPRINTF("device not on hub\n"); 1045 if (buflen) { 1046 buf[0] = '\0'; 1047 } 1048 goto done; 1049 } 1050 iface = usbd_get_iface(res.udev, res.iface_index); 1051 if (iface && iface->idesc) { 1052 snprintf(buf, buflen, "vendor=0x%04x product=0x%04x " 1053 "devclass=0x%02x devsubclass=0x%02x " 1054 "sernum=\"%s\" " 1055 "release=0x%04x " 1056 "intclass=0x%02x intsubclass=0x%02x", 1057 UGETW(res.udev->ddesc.idVendor), 1058 UGETW(res.udev->ddesc.idProduct), 1059 res.udev->ddesc.bDeviceClass, 1060 res.udev->ddesc.bDeviceSubClass, 1061 res.udev->serial, 1062 UGETW(res.udev->ddesc.bcdDevice), 1063 iface->idesc->bInterfaceClass, 1064 iface->idesc->bInterfaceSubClass); 1065 } else { 1066 if (buflen) { 1067 buf[0] = '\0'; 1068 } 1069 goto done; 1070 } 1071 done: 1072 mtx_unlock(&Giant); 1073 1074 return (0); 1075 } 1076 1077 /* 1078 * The USB Transaction Translator: 1079 * =============================== 1080 * 1081 * When doing LOW- and FULL-speed USB transfers accross a HIGH-speed 1082 * USB HUB, bandwidth must be allocated for ISOCHRONOUS and INTERRUPT 1083 * USB transfers. To utilize bandwidth dynamically the "scatter and 1084 * gather" principle must be applied. This means that bandwidth must 1085 * be divided into equal parts of bandwidth. With regard to USB all 1086 * data is transferred in smaller packets with length 1087 * "wMaxPacketSize". The problem however is that "wMaxPacketSize" is 1088 * not a constant! 1089 * 1090 * The bandwidth scheduler which I have implemented will simply pack 1091 * the USB transfers back to back until there is no more space in the 1092 * schedule. Out of the 8 microframes which the USB 2.0 standard 1093 * provides, only 6 are available for non-HIGH-speed devices. I have 1094 * reserved the first 4 microframes for ISOCHRONOUS transfers. The 1095 * last 2 microframes I have reserved for INTERRUPT transfers. Without 1096 * this division, it is very difficult to allocate and free bandwidth 1097 * dynamically. 1098 * 1099 * NOTE about the Transaction Translator in USB HUBs: 1100 * 1101 * USB HUBs have a very simple Transaction Translator, that will 1102 * simply pipeline all the SPLIT transactions. That means that the 1103 * transactions will be executed in the order they are queued! 1104 * 1105 */ 1106 1107 /*------------------------------------------------------------------------* 1108 * usb_intr_find_best_slot 1109 * 1110 * Return value: 1111 * The best Transaction Translation slot for an interrupt endpoint. 1112 *------------------------------------------------------------------------*/ 1113 static uint8_t 1114 usb_intr_find_best_slot(usb_size_t *ptr, uint8_t start, 1115 uint8_t end, uint8_t mask) 1116 { 1117 usb_size_t min = 0 - 1; 1118 usb_size_t sum; 1119 uint8_t x; 1120 uint8_t y; 1121 uint8_t z; 1122 1123 y = 0; 1124 1125 /* find the last slot with lesser used bandwidth */ 1126 1127 for (x = start; x < end; x++) { 1128 1129 sum = 0; 1130 1131 /* compute sum of bandwidth */ 1132 for (z = x; z < end; z++) { 1133 if (mask & (1U << (z - x))) 1134 sum += ptr[z]; 1135 } 1136 1137 /* check if the current multi-slot is more optimal */ 1138 if (min >= sum) { 1139 min = sum; 1140 y = x; 1141 } 1142 1143 /* check if the mask is about to be shifted out */ 1144 if (mask & (1U << (end - 1 - x))) 1145 break; 1146 } 1147 return (y); 1148 } 1149 1150 /*------------------------------------------------------------------------* 1151 * usb_hs_bandwidth_adjust 1152 * 1153 * This function will update the bandwith usage for the microframe 1154 * having index "slot" by "len" bytes. "len" can be negative. If the 1155 * "slot" argument is greater or equal to "USB_HS_MICRO_FRAMES_MAX" 1156 * the "slot" argument will be replaced by the slot having least used 1157 * bandwidth. The "mask" argument is used for multi-slot allocations. 1158 * 1159 * Returns: 1160 * The slot in which the bandwidth update was done: 0..7 1161 *------------------------------------------------------------------------*/ 1162 static uint8_t 1163 usb_hs_bandwidth_adjust(struct usb_device *udev, int16_t len, 1164 uint8_t slot, uint8_t mask) 1165 { 1166 struct usb_bus *bus = udev->bus; 1167 struct usb_hub *hub; 1168 enum usb_dev_speed speed; 1169 uint8_t x; 1170 1171 USB_BUS_LOCK_ASSERT(bus, MA_OWNED); 1172 1173 speed = usbd_get_speed(udev); 1174 1175 switch (speed) { 1176 case USB_SPEED_LOW: 1177 case USB_SPEED_FULL: 1178 if (speed == USB_SPEED_LOW) { 1179 len *= 8; 1180 } 1181 /* 1182 * The Host Controller Driver should have 1183 * performed checks so that the lookup 1184 * below does not result in a NULL pointer 1185 * access. 1186 */ 1187 1188 hub = udev->parent_hs_hub->hub; 1189 if (slot >= USB_HS_MICRO_FRAMES_MAX) { 1190 slot = usb_intr_find_best_slot(hub->uframe_usage, 1191 USB_FS_ISOC_UFRAME_MAX, 6, mask); 1192 } 1193 for (x = slot; x < 8; x++) { 1194 if (mask & (1U << (x - slot))) { 1195 hub->uframe_usage[x] += len; 1196 bus->uframe_usage[x] += len; 1197 } 1198 } 1199 break; 1200 default: 1201 if (slot >= USB_HS_MICRO_FRAMES_MAX) { 1202 slot = usb_intr_find_best_slot(bus->uframe_usage, 0, 1203 USB_HS_MICRO_FRAMES_MAX, mask); 1204 } 1205 for (x = slot; x < 8; x++) { 1206 if (mask & (1U << (x - slot))) { 1207 bus->uframe_usage[x] += len; 1208 } 1209 } 1210 break; 1211 } 1212 return (slot); 1213 } 1214 1215 /*------------------------------------------------------------------------* 1216 * usb_hs_bandwidth_alloc 1217 * 1218 * This function is a wrapper function for "usb_hs_bandwidth_adjust()". 1219 *------------------------------------------------------------------------*/ 1220 void 1221 usb_hs_bandwidth_alloc(struct usb_xfer *xfer) 1222 { 1223 struct usb_device *udev; 1224 uint8_t slot; 1225 uint8_t mask; 1226 uint8_t speed; 1227 1228 udev = xfer->xroot->udev; 1229 1230 if (udev->flags.usb_mode != USB_MODE_HOST) 1231 return; /* not supported */ 1232 1233 xfer->endpoint->refcount_bw++; 1234 if (xfer->endpoint->refcount_bw != 1) 1235 return; /* already allocated */ 1236 1237 speed = usbd_get_speed(udev); 1238 1239 switch (xfer->endpoint->edesc->bmAttributes & UE_XFERTYPE) { 1240 case UE_INTERRUPT: 1241 /* allocate a microframe slot */ 1242 1243 mask = 0x01; 1244 slot = usb_hs_bandwidth_adjust(udev, 1245 xfer->max_frame_size, USB_HS_MICRO_FRAMES_MAX, mask); 1246 1247 xfer->endpoint->usb_uframe = slot; 1248 xfer->endpoint->usb_smask = mask << slot; 1249 1250 if ((speed != USB_SPEED_FULL) && 1251 (speed != USB_SPEED_LOW)) { 1252 xfer->endpoint->usb_cmask = 0x00 ; 1253 } else { 1254 xfer->endpoint->usb_cmask = (-(0x04 << slot)) & 0xFE; 1255 } 1256 break; 1257 1258 case UE_ISOCHRONOUS: 1259 switch (usbd_xfer_get_fps_shift(xfer)) { 1260 case 0: 1261 mask = 0xFF; 1262 break; 1263 case 1: 1264 mask = 0x55; 1265 break; 1266 case 2: 1267 mask = 0x11; 1268 break; 1269 default: 1270 mask = 0x01; 1271 break; 1272 } 1273 1274 /* allocate a microframe multi-slot */ 1275 1276 slot = usb_hs_bandwidth_adjust(udev, 1277 xfer->max_frame_size, USB_HS_MICRO_FRAMES_MAX, mask); 1278 1279 xfer->endpoint->usb_uframe = slot; 1280 xfer->endpoint->usb_cmask = 0; 1281 xfer->endpoint->usb_smask = mask << slot; 1282 break; 1283 1284 default: 1285 xfer->endpoint->usb_uframe = 0; 1286 xfer->endpoint->usb_cmask = 0; 1287 xfer->endpoint->usb_smask = 0; 1288 break; 1289 } 1290 1291 DPRINTFN(11, "slot=%d, mask=0x%02x\n", 1292 xfer->endpoint->usb_uframe, 1293 xfer->endpoint->usb_smask >> xfer->endpoint->usb_uframe); 1294 } 1295 1296 /*------------------------------------------------------------------------* 1297 * usb_hs_bandwidth_free 1298 * 1299 * This function is a wrapper function for "usb_hs_bandwidth_adjust()". 1300 *------------------------------------------------------------------------*/ 1301 void 1302 usb_hs_bandwidth_free(struct usb_xfer *xfer) 1303 { 1304 struct usb_device *udev; 1305 uint8_t slot; 1306 uint8_t mask; 1307 1308 udev = xfer->xroot->udev; 1309 1310 if (udev->flags.usb_mode != USB_MODE_HOST) 1311 return; /* not supported */ 1312 1313 xfer->endpoint->refcount_bw--; 1314 if (xfer->endpoint->refcount_bw != 0) 1315 return; /* still allocated */ 1316 1317 switch (xfer->endpoint->edesc->bmAttributes & UE_XFERTYPE) { 1318 case UE_INTERRUPT: 1319 case UE_ISOCHRONOUS: 1320 1321 slot = xfer->endpoint->usb_uframe; 1322 mask = xfer->endpoint->usb_smask; 1323 1324 /* free microframe slot(s): */ 1325 usb_hs_bandwidth_adjust(udev, 1326 -xfer->max_frame_size, slot, mask >> slot); 1327 1328 DPRINTFN(11, "slot=%d, mask=0x%02x\n", 1329 slot, mask >> slot); 1330 1331 xfer->endpoint->usb_uframe = 0; 1332 xfer->endpoint->usb_cmask = 0; 1333 xfer->endpoint->usb_smask = 0; 1334 break; 1335 1336 default: 1337 break; 1338 } 1339 } 1340 1341 /*------------------------------------------------------------------------* 1342 * usbd_fs_isoc_schedule_init_sub 1343 * 1344 * This function initialises an USB FULL speed isochronous schedule 1345 * entry. 1346 *------------------------------------------------------------------------*/ 1347 #if USB_HAVE_TT_SUPPORT 1348 static void 1349 usbd_fs_isoc_schedule_init_sub(struct usb_fs_isoc_schedule *fss) 1350 { 1351 fss->total_bytes = (USB_FS_ISOC_UFRAME_MAX * 1352 USB_FS_BYTES_PER_HS_UFRAME); 1353 fss->frame_bytes = (USB_FS_BYTES_PER_HS_UFRAME); 1354 fss->frame_slot = 0; 1355 } 1356 #endif 1357 1358 /*------------------------------------------------------------------------* 1359 * usbd_fs_isoc_schedule_init_all 1360 * 1361 * This function will reset the complete USB FULL speed isochronous 1362 * bandwidth schedule. 1363 *------------------------------------------------------------------------*/ 1364 #if USB_HAVE_TT_SUPPORT 1365 void 1366 usbd_fs_isoc_schedule_init_all(struct usb_fs_isoc_schedule *fss) 1367 { 1368 struct usb_fs_isoc_schedule *fss_end = fss + USB_ISOC_TIME_MAX; 1369 1370 while (fss != fss_end) { 1371 usbd_fs_isoc_schedule_init_sub(fss); 1372 fss++; 1373 } 1374 } 1375 #endif 1376 1377 /*------------------------------------------------------------------------* 1378 * usb_isoc_time_expand 1379 * 1380 * This function will expand the time counter from 7-bit to 16-bit. 1381 * 1382 * Returns: 1383 * 16-bit isochronous time counter. 1384 *------------------------------------------------------------------------*/ 1385 uint16_t 1386 usb_isoc_time_expand(struct usb_bus *bus, uint16_t isoc_time_curr) 1387 { 1388 uint16_t rem; 1389 1390 USB_BUS_LOCK_ASSERT(bus, MA_OWNED); 1391 1392 rem = bus->isoc_time_last & (USB_ISOC_TIME_MAX - 1); 1393 1394 isoc_time_curr &= (USB_ISOC_TIME_MAX - 1); 1395 1396 if (isoc_time_curr < rem) { 1397 /* the time counter wrapped around */ 1398 bus->isoc_time_last += USB_ISOC_TIME_MAX; 1399 } 1400 /* update the remainder */ 1401 1402 bus->isoc_time_last &= ~(USB_ISOC_TIME_MAX - 1); 1403 bus->isoc_time_last |= isoc_time_curr; 1404 1405 return (bus->isoc_time_last); 1406 } 1407 1408 /*------------------------------------------------------------------------* 1409 * usbd_fs_isoc_schedule_isoc_time_expand 1410 * 1411 * This function does multiple things. First of all it will expand the 1412 * passed isochronous time, which is the return value. Then it will 1413 * store where the current FULL speed isochronous schedule is 1414 * positioned in time and where the end is. See "pp_start" and 1415 * "pp_end" arguments. 1416 * 1417 * Returns: 1418 * Expanded version of "isoc_time". 1419 * 1420 * NOTE: This function depends on being called regularly with 1421 * intervals less than "USB_ISOC_TIME_MAX". 1422 *------------------------------------------------------------------------*/ 1423 #if USB_HAVE_TT_SUPPORT 1424 uint16_t 1425 usbd_fs_isoc_schedule_isoc_time_expand(struct usb_device *udev, 1426 struct usb_fs_isoc_schedule **pp_start, 1427 struct usb_fs_isoc_schedule **pp_end, 1428 uint16_t isoc_time) 1429 { 1430 struct usb_fs_isoc_schedule *fss_end; 1431 struct usb_fs_isoc_schedule *fss_a; 1432 struct usb_fs_isoc_schedule *fss_b; 1433 struct usb_hub *hs_hub; 1434 1435 isoc_time = usb_isoc_time_expand(udev->bus, isoc_time); 1436 1437 hs_hub = udev->parent_hs_hub->hub; 1438 1439 if (hs_hub != NULL) { 1440 1441 fss_a = hs_hub->fs_isoc_schedule + 1442 (hs_hub->isoc_last_time % USB_ISOC_TIME_MAX); 1443 1444 hs_hub->isoc_last_time = isoc_time; 1445 1446 fss_b = hs_hub->fs_isoc_schedule + 1447 (isoc_time % USB_ISOC_TIME_MAX); 1448 1449 fss_end = hs_hub->fs_isoc_schedule + USB_ISOC_TIME_MAX; 1450 1451 *pp_start = hs_hub->fs_isoc_schedule; 1452 *pp_end = fss_end; 1453 1454 while (fss_a != fss_b) { 1455 if (fss_a == fss_end) { 1456 fss_a = hs_hub->fs_isoc_schedule; 1457 continue; 1458 } 1459 usbd_fs_isoc_schedule_init_sub(fss_a); 1460 fss_a++; 1461 } 1462 1463 } else { 1464 1465 *pp_start = NULL; 1466 *pp_end = NULL; 1467 } 1468 return (isoc_time); 1469 } 1470 #endif 1471 1472 /*------------------------------------------------------------------------* 1473 * usbd_fs_isoc_schedule_alloc 1474 * 1475 * This function will allocate bandwidth for an isochronous FULL speed 1476 * transaction in the FULL speed schedule. The microframe slot where 1477 * the transaction should be started is stored in the byte pointed to 1478 * by "pstart". The "len" argument specifies the length of the 1479 * transaction in bytes. 1480 * 1481 * Returns: 1482 * 0: Success 1483 * Else: Error 1484 *------------------------------------------------------------------------*/ 1485 #if USB_HAVE_TT_SUPPORT 1486 uint8_t 1487 usbd_fs_isoc_schedule_alloc(struct usb_fs_isoc_schedule *fss, 1488 uint8_t *pstart, uint16_t len) 1489 { 1490 uint8_t slot = fss->frame_slot; 1491 1492 /* Compute overhead and bit-stuffing */ 1493 1494 len += 8; 1495 1496 len *= 7; 1497 len /= 6; 1498 1499 if (len > fss->total_bytes) { 1500 *pstart = 0; /* set some dummy value */ 1501 return (1); /* error */ 1502 } 1503 if (len > 0) { 1504 1505 fss->total_bytes -= len; 1506 1507 while (len >= fss->frame_bytes) { 1508 len -= fss->frame_bytes; 1509 fss->frame_bytes = USB_FS_BYTES_PER_HS_UFRAME; 1510 fss->frame_slot++; 1511 } 1512 1513 fss->frame_bytes -= len; 1514 } 1515 *pstart = slot; 1516 return (0); /* success */ 1517 } 1518 #endif 1519 1520 /*------------------------------------------------------------------------* 1521 * usb_bus_port_get_device 1522 * 1523 * This function is NULL safe. 1524 *------------------------------------------------------------------------*/ 1525 struct usb_device * 1526 usb_bus_port_get_device(struct usb_bus *bus, struct usb_port *up) 1527 { 1528 if ((bus == NULL) || (up == NULL)) { 1529 /* be NULL safe */ 1530 return (NULL); 1531 } 1532 if (up->device_index == 0) { 1533 /* nothing to do */ 1534 return (NULL); 1535 } 1536 return (bus->devices[up->device_index]); 1537 } 1538 1539 /*------------------------------------------------------------------------* 1540 * usb_bus_port_set_device 1541 * 1542 * This function is NULL safe. 1543 *------------------------------------------------------------------------*/ 1544 void 1545 usb_bus_port_set_device(struct usb_bus *bus, struct usb_port *up, 1546 struct usb_device *udev, uint8_t device_index) 1547 { 1548 if (bus == NULL) { 1549 /* be NULL safe */ 1550 return; 1551 } 1552 /* 1553 * There is only one case where we don't 1554 * have an USB port, and that is the Root Hub! 1555 */ 1556 if (up) { 1557 if (udev) { 1558 up->device_index = device_index; 1559 } else { 1560 device_index = up->device_index; 1561 up->device_index = 0; 1562 } 1563 } 1564 /* 1565 * Make relationships to our new device 1566 */ 1567 if (device_index != 0) { 1568 #if USB_HAVE_UGEN 1569 mtx_lock(&usb_ref_lock); 1570 #endif 1571 bus->devices[device_index] = udev; 1572 #if USB_HAVE_UGEN 1573 mtx_unlock(&usb_ref_lock); 1574 #endif 1575 } 1576 /* 1577 * Debug print 1578 */ 1579 DPRINTFN(2, "bus %p devices[%u] = %p\n", bus, device_index, udev); 1580 } 1581 1582 /*------------------------------------------------------------------------* 1583 * usb_needs_explore 1584 * 1585 * This functions is called when the USB event thread needs to run. 1586 *------------------------------------------------------------------------*/ 1587 void 1588 usb_needs_explore(struct usb_bus *bus, uint8_t do_probe) 1589 { 1590 uint8_t do_unlock; 1591 1592 DPRINTF("\n"); 1593 1594 if (bus == NULL) { 1595 DPRINTF("No bus pointer!\n"); 1596 return; 1597 } 1598 if ((bus->devices == NULL) || 1599 (bus->devices[USB_ROOT_HUB_ADDR] == NULL)) { 1600 DPRINTF("No root HUB\n"); 1601 return; 1602 } 1603 if (mtx_owned(&bus->bus_mtx)) { 1604 do_unlock = 0; 1605 } else { 1606 USB_BUS_LOCK(bus); 1607 do_unlock = 1; 1608 } 1609 if (do_probe) { 1610 bus->do_probe = 1; 1611 } 1612 if (usb_proc_msignal(&bus->explore_proc, 1613 &bus->explore_msg[0], &bus->explore_msg[1])) { 1614 /* ignore */ 1615 } 1616 if (do_unlock) { 1617 USB_BUS_UNLOCK(bus); 1618 } 1619 } 1620 1621 /*------------------------------------------------------------------------* 1622 * usb_needs_explore_all 1623 * 1624 * This function is called whenever a new driver is loaded and will 1625 * cause that all USB busses are re-explored. 1626 *------------------------------------------------------------------------*/ 1627 void 1628 usb_needs_explore_all(void) 1629 { 1630 struct usb_bus *bus; 1631 devclass_t dc; 1632 device_t dev; 1633 int max; 1634 1635 DPRINTFN(3, "\n"); 1636 1637 dc = usb_devclass_ptr; 1638 if (dc == NULL) { 1639 DPRINTFN(0, "no devclass\n"); 1640 return; 1641 } 1642 /* 1643 * Explore all USB busses in parallell. 1644 */ 1645 max = devclass_get_maxunit(dc); 1646 while (max >= 0) { 1647 dev = devclass_get_device(dc, max); 1648 if (dev) { 1649 bus = device_get_softc(dev); 1650 if (bus) { 1651 usb_needs_explore(bus, 1); 1652 } 1653 } 1654 max--; 1655 } 1656 } 1657 1658 /*------------------------------------------------------------------------* 1659 * usb_bus_power_update 1660 * 1661 * This function will ensure that all USB devices on the given bus are 1662 * properly suspended or resumed according to the device transfer 1663 * state. 1664 *------------------------------------------------------------------------*/ 1665 #if USB_HAVE_POWERD 1666 void 1667 usb_bus_power_update(struct usb_bus *bus) 1668 { 1669 usb_needs_explore(bus, 0 /* no probe */ ); 1670 } 1671 #endif 1672 1673 /*------------------------------------------------------------------------* 1674 * usbd_transfer_power_ref 1675 * 1676 * This function will modify the power save reference counts and 1677 * wakeup the USB device associated with the given USB transfer, if 1678 * needed. 1679 *------------------------------------------------------------------------*/ 1680 #if USB_HAVE_POWERD 1681 void 1682 usbd_transfer_power_ref(struct usb_xfer *xfer, int val) 1683 { 1684 static const usb_power_mask_t power_mask[4] = { 1685 [UE_CONTROL] = USB_HW_POWER_CONTROL, 1686 [UE_BULK] = USB_HW_POWER_BULK, 1687 [UE_INTERRUPT] = USB_HW_POWER_INTERRUPT, 1688 [UE_ISOCHRONOUS] = USB_HW_POWER_ISOC, 1689 }; 1690 struct usb_device *udev; 1691 uint8_t needs_explore; 1692 uint8_t needs_hw_power; 1693 uint8_t xfer_type; 1694 1695 udev = xfer->xroot->udev; 1696 1697 if (udev->device_index == USB_ROOT_HUB_ADDR) { 1698 /* no power save for root HUB */ 1699 return; 1700 } 1701 USB_BUS_LOCK(udev->bus); 1702 1703 xfer_type = xfer->endpoint->edesc->bmAttributes & UE_XFERTYPE; 1704 1705 udev->pwr_save.last_xfer_time = ticks; 1706 udev->pwr_save.type_refs[xfer_type] += val; 1707 1708 if (xfer->flags_int.control_xfr) { 1709 udev->pwr_save.read_refs += val; 1710 if (xfer->flags_int.usb_mode == USB_MODE_HOST) { 1711 /* 1712 * It is not allowed to suspend during a 1713 * control transfer: 1714 */ 1715 udev->pwr_save.write_refs += val; 1716 } 1717 } else if (USB_GET_DATA_ISREAD(xfer)) { 1718 udev->pwr_save.read_refs += val; 1719 } else { 1720 udev->pwr_save.write_refs += val; 1721 } 1722 1723 if (val > 0) { 1724 if (udev->flags.self_suspended) 1725 needs_explore = usb_peer_should_wakeup(udev); 1726 else 1727 needs_explore = 0; 1728 1729 if (!(udev->bus->hw_power_state & power_mask[xfer_type])) { 1730 DPRINTF("Adding type %u to power state\n", xfer_type); 1731 udev->bus->hw_power_state |= power_mask[xfer_type]; 1732 needs_hw_power = 1; 1733 } else { 1734 needs_hw_power = 0; 1735 } 1736 } else { 1737 needs_explore = 0; 1738 needs_hw_power = 0; 1739 } 1740 1741 USB_BUS_UNLOCK(udev->bus); 1742 1743 if (needs_explore) { 1744 DPRINTF("update\n"); 1745 usb_bus_power_update(udev->bus); 1746 } else if (needs_hw_power) { 1747 DPRINTF("needs power\n"); 1748 if (udev->bus->methods->set_hw_power != NULL) { 1749 (udev->bus->methods->set_hw_power) (udev->bus); 1750 } 1751 } 1752 } 1753 #endif 1754 1755 /*------------------------------------------------------------------------* 1756 * usb_peer_should_wakeup 1757 * 1758 * This function returns non-zero if the current device should wake up. 1759 *------------------------------------------------------------------------*/ 1760 static uint8_t 1761 usb_peer_should_wakeup(struct usb_device *udev) 1762 { 1763 return ((udev->power_mode == USB_POWER_MODE_ON) || 1764 (udev->pwr_save.type_refs[UE_ISOCHRONOUS] != 0) || 1765 (udev->pwr_save.write_refs != 0) || 1766 ((udev->pwr_save.read_refs != 0) && 1767 (udev->flags.usb_mode == USB_MODE_HOST) && 1768 (usb_peer_can_wakeup(udev) == 0))); 1769 } 1770 1771 /*------------------------------------------------------------------------* 1772 * usb_bus_powerd 1773 * 1774 * This function implements the USB power daemon and is called 1775 * regularly from the USB explore thread. 1776 *------------------------------------------------------------------------*/ 1777 #if USB_HAVE_POWERD 1778 void 1779 usb_bus_powerd(struct usb_bus *bus) 1780 { 1781 struct usb_device *udev; 1782 usb_ticks_t temp; 1783 usb_ticks_t limit; 1784 usb_ticks_t mintime; 1785 usb_size_t type_refs[5]; 1786 uint8_t x; 1787 1788 limit = usb_power_timeout; 1789 if (limit == 0) 1790 limit = hz; 1791 else if (limit > 255) 1792 limit = 255 * hz; 1793 else 1794 limit = limit * hz; 1795 1796 DPRINTF("bus=%p\n", bus); 1797 1798 USB_BUS_LOCK(bus); 1799 1800 /* 1801 * The root HUB device is never suspended 1802 * and we simply skip it. 1803 */ 1804 for (x = USB_ROOT_HUB_ADDR + 1; 1805 x != bus->devices_max; x++) { 1806 1807 udev = bus->devices[x]; 1808 if (udev == NULL) 1809 continue; 1810 1811 temp = ticks - udev->pwr_save.last_xfer_time; 1812 1813 if (usb_peer_should_wakeup(udev)) { 1814 /* check if we are suspended */ 1815 if (udev->flags.self_suspended != 0) { 1816 USB_BUS_UNLOCK(bus); 1817 usb_dev_resume_peer(udev); 1818 USB_BUS_LOCK(bus); 1819 } 1820 } else if ((temp >= limit) && 1821 (udev->flags.usb_mode == USB_MODE_HOST) && 1822 (udev->flags.self_suspended == 0)) { 1823 /* try to do suspend */ 1824 1825 USB_BUS_UNLOCK(bus); 1826 usb_dev_suspend_peer(udev); 1827 USB_BUS_LOCK(bus); 1828 } 1829 } 1830 1831 /* reset counters */ 1832 1833 mintime = 0 - 1; 1834 type_refs[0] = 0; 1835 type_refs[1] = 0; 1836 type_refs[2] = 0; 1837 type_refs[3] = 0; 1838 type_refs[4] = 0; 1839 1840 /* Re-loop all the devices to get the actual state */ 1841 1842 for (x = USB_ROOT_HUB_ADDR + 1; 1843 x != bus->devices_max; x++) { 1844 1845 udev = bus->devices[x]; 1846 if (udev == NULL) 1847 continue; 1848 1849 /* we found a non-Root-Hub USB device */ 1850 type_refs[4] += 1; 1851 1852 /* "last_xfer_time" can be updated by a resume */ 1853 temp = ticks - udev->pwr_save.last_xfer_time; 1854 1855 /* 1856 * Compute minimum time since last transfer for the complete 1857 * bus: 1858 */ 1859 if (temp < mintime) 1860 mintime = temp; 1861 1862 if (udev->flags.self_suspended == 0) { 1863 type_refs[0] += udev->pwr_save.type_refs[0]; 1864 type_refs[1] += udev->pwr_save.type_refs[1]; 1865 type_refs[2] += udev->pwr_save.type_refs[2]; 1866 type_refs[3] += udev->pwr_save.type_refs[3]; 1867 } 1868 } 1869 1870 if (mintime >= (1 * hz)) { 1871 /* recompute power masks */ 1872 DPRINTF("Recomputing power masks\n"); 1873 bus->hw_power_state = 0; 1874 if (type_refs[UE_CONTROL] != 0) 1875 bus->hw_power_state |= USB_HW_POWER_CONTROL; 1876 if (type_refs[UE_BULK] != 0) 1877 bus->hw_power_state |= USB_HW_POWER_BULK; 1878 if (type_refs[UE_INTERRUPT] != 0) 1879 bus->hw_power_state |= USB_HW_POWER_INTERRUPT; 1880 if (type_refs[UE_ISOCHRONOUS] != 0) 1881 bus->hw_power_state |= USB_HW_POWER_ISOC; 1882 if (type_refs[4] != 0) 1883 bus->hw_power_state |= USB_HW_POWER_NON_ROOT_HUB; 1884 } 1885 USB_BUS_UNLOCK(bus); 1886 1887 if (bus->methods->set_hw_power != NULL) { 1888 /* always update hardware power! */ 1889 (bus->methods->set_hw_power) (bus); 1890 } 1891 return; 1892 } 1893 #endif 1894 1895 /*------------------------------------------------------------------------* 1896 * usb_dev_resume_peer 1897 * 1898 * This function will resume an USB peer and do the required USB 1899 * signalling to get an USB device out of the suspended state. 1900 *------------------------------------------------------------------------*/ 1901 static void 1902 usb_dev_resume_peer(struct usb_device *udev) 1903 { 1904 struct usb_bus *bus; 1905 int err; 1906 1907 /* be NULL safe */ 1908 if (udev == NULL) 1909 return; 1910 1911 /* check if already resumed */ 1912 if (udev->flags.self_suspended == 0) 1913 return; 1914 1915 /* we need a parent HUB to do resume */ 1916 if (udev->parent_hub == NULL) 1917 return; 1918 1919 DPRINTF("udev=%p\n", udev); 1920 1921 if ((udev->flags.usb_mode == USB_MODE_DEVICE) && 1922 (udev->flags.remote_wakeup == 0)) { 1923 /* 1924 * If the host did not set the remote wakeup feature, we can 1925 * not wake it up either! 1926 */ 1927 DPRINTF("remote wakeup is not set!\n"); 1928 return; 1929 } 1930 /* get bus pointer */ 1931 bus = udev->bus; 1932 1933 /* resume parent hub first */ 1934 usb_dev_resume_peer(udev->parent_hub); 1935 1936 /* reduce chance of instant resume failure by waiting a little bit */ 1937 usb_pause_mtx(NULL, USB_MS_TO_TICKS(20)); 1938 1939 /* resume current port (Valid in Host and Device Mode) */ 1940 err = usbd_req_clear_port_feature(udev->parent_hub, 1941 NULL, udev->port_no, UHF_PORT_SUSPEND); 1942 if (err) { 1943 DPRINTFN(0, "Resuming port failed\n"); 1944 return; 1945 } 1946 /* resume settle time */ 1947 usb_pause_mtx(NULL, USB_MS_TO_TICKS(USB_PORT_RESUME_DELAY)); 1948 1949 if (bus->methods->device_resume != NULL) { 1950 /* resume USB device on the USB controller */ 1951 (bus->methods->device_resume) (udev); 1952 } 1953 USB_BUS_LOCK(bus); 1954 /* set that this device is now resumed */ 1955 udev->flags.self_suspended = 0; 1956 #if USB_HAVE_POWERD 1957 /* make sure that we don't go into suspend right away */ 1958 udev->pwr_save.last_xfer_time = ticks; 1959 1960 /* make sure the needed power masks are on */ 1961 if (udev->pwr_save.type_refs[UE_CONTROL] != 0) 1962 bus->hw_power_state |= USB_HW_POWER_CONTROL; 1963 if (udev->pwr_save.type_refs[UE_BULK] != 0) 1964 bus->hw_power_state |= USB_HW_POWER_BULK; 1965 if (udev->pwr_save.type_refs[UE_INTERRUPT] != 0) 1966 bus->hw_power_state |= USB_HW_POWER_INTERRUPT; 1967 if (udev->pwr_save.type_refs[UE_ISOCHRONOUS] != 0) 1968 bus->hw_power_state |= USB_HW_POWER_ISOC; 1969 #endif 1970 USB_BUS_UNLOCK(bus); 1971 1972 if (bus->methods->set_hw_power != NULL) { 1973 /* always update hardware power! */ 1974 (bus->methods->set_hw_power) (bus); 1975 } 1976 1977 usbd_sr_lock(udev); 1978 1979 /* notify all sub-devices about resume */ 1980 err = usb_suspend_resume(udev, 0); 1981 1982 usbd_sr_unlock(udev); 1983 1984 /* check if peer has wakeup capability */ 1985 if (usb_peer_can_wakeup(udev)) { 1986 /* clear remote wakeup */ 1987 err = usbd_req_clear_device_feature(udev, 1988 NULL, UF_DEVICE_REMOTE_WAKEUP); 1989 if (err) { 1990 DPRINTFN(0, "Clearing device " 1991 "remote wakeup failed: %s\n", 1992 usbd_errstr(err)); 1993 } 1994 } 1995 return; 1996 } 1997 1998 /*------------------------------------------------------------------------* 1999 * usb_dev_suspend_peer 2000 * 2001 * This function will suspend an USB peer and do the required USB 2002 * signalling to get an USB device into the suspended state. 2003 *------------------------------------------------------------------------*/ 2004 static void 2005 usb_dev_suspend_peer(struct usb_device *udev) 2006 { 2007 struct usb_device *child; 2008 int err; 2009 uint8_t x; 2010 uint8_t nports; 2011 2012 repeat: 2013 /* be NULL safe */ 2014 if (udev == NULL) 2015 return; 2016 2017 /* check if already suspended */ 2018 if (udev->flags.self_suspended) 2019 return; 2020 2021 /* we need a parent HUB to do suspend */ 2022 if (udev->parent_hub == NULL) 2023 return; 2024 2025 DPRINTF("udev=%p\n", udev); 2026 2027 /* check if the current device is a HUB */ 2028 if (udev->hub != NULL) { 2029 nports = udev->hub->nports; 2030 2031 /* check if all devices on the HUB are suspended */ 2032 for (x = 0; x != nports; x++) { 2033 2034 child = usb_bus_port_get_device(udev->bus, 2035 udev->hub->ports + x); 2036 2037 if (child == NULL) 2038 continue; 2039 2040 if (child->flags.self_suspended) 2041 continue; 2042 2043 DPRINTFN(1, "Port %u is busy on the HUB!\n", x + 1); 2044 return; 2045 } 2046 } 2047 2048 USB_BUS_LOCK(udev->bus); 2049 /* 2050 * Checking for suspend condition and setting suspended bit 2051 * must be atomic! 2052 */ 2053 err = usb_peer_should_wakeup(udev); 2054 if (err == 0) { 2055 /* 2056 * Set that this device is suspended. This variable 2057 * must be set before calling USB controller suspend 2058 * callbacks. 2059 */ 2060 udev->flags.self_suspended = 1; 2061 } 2062 USB_BUS_UNLOCK(udev->bus); 2063 2064 if (err != 0) { 2065 if (udev->flags.usb_mode == USB_MODE_DEVICE) { 2066 /* resume parent HUB first */ 2067 usb_dev_resume_peer(udev->parent_hub); 2068 2069 /* reduce chance of instant resume failure by waiting a little bit */ 2070 usb_pause_mtx(NULL, USB_MS_TO_TICKS(20)); 2071 2072 /* resume current port (Valid in Host and Device Mode) */ 2073 err = usbd_req_clear_port_feature(udev->parent_hub, 2074 NULL, udev->port_no, UHF_PORT_SUSPEND); 2075 2076 /* resume settle time */ 2077 usb_pause_mtx(NULL, USB_MS_TO_TICKS(USB_PORT_RESUME_DELAY)); 2078 } 2079 DPRINTF("Suspend was cancelled!\n"); 2080 return; 2081 } 2082 2083 usbd_sr_lock(udev); 2084 2085 /* notify all sub-devices about suspend */ 2086 err = usb_suspend_resume(udev, 1); 2087 2088 usbd_sr_unlock(udev); 2089 2090 if (usb_peer_can_wakeup(udev)) { 2091 /* allow device to do remote wakeup */ 2092 err = usbd_req_set_device_feature(udev, 2093 NULL, UF_DEVICE_REMOTE_WAKEUP); 2094 if (err) { 2095 DPRINTFN(0, "Setting device " 2096 "remote wakeup failed\n"); 2097 } 2098 } 2099 2100 if (udev->bus->methods->device_suspend != NULL) { 2101 usb_timeout_t temp; 2102 2103 /* suspend device on the USB controller */ 2104 (udev->bus->methods->device_suspend) (udev); 2105 2106 /* do DMA delay */ 2107 temp = usbd_get_dma_delay(udev->bus); 2108 usb_pause_mtx(NULL, USB_MS_TO_TICKS(temp)); 2109 2110 } 2111 /* suspend current port */ 2112 err = usbd_req_set_port_feature(udev->parent_hub, 2113 NULL, udev->port_no, UHF_PORT_SUSPEND); 2114 if (err) { 2115 DPRINTFN(0, "Suspending port failed\n"); 2116 return; 2117 } 2118 2119 udev = udev->parent_hub; 2120 goto repeat; 2121 } 2122 2123 /*------------------------------------------------------------------------* 2124 * usbd_set_power_mode 2125 * 2126 * This function will set the power mode, see USB_POWER_MODE_XXX for a 2127 * USB device. 2128 *------------------------------------------------------------------------*/ 2129 void 2130 usbd_set_power_mode(struct usb_device *udev, uint8_t power_mode) 2131 { 2132 /* filter input argument */ 2133 if ((power_mode != USB_POWER_MODE_ON) && 2134 (power_mode != USB_POWER_MODE_OFF)) { 2135 power_mode = USB_POWER_MODE_SAVE; 2136 } 2137 udev->power_mode = power_mode; /* update copy of power mode */ 2138 2139 #if USB_HAVE_POWERD 2140 usb_bus_power_update(udev->bus); 2141 #endif 2142 }
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