firmware/usb.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Linus Nielsen Feltzing
  11  *
  12  * iPod driver based on code from the ipodlinux project - http://ipodlinux.org
  13  * Adapted for Rockbox in January 2006
  14  * Original file: podzilla/usb.c
  15  * Copyright (C) 2005 Adam Johnston
  16  *
  17  * This program is free software; you can redistribute it and/or
  18  * modify it under the terms of the GNU General Public License
  19  * as published by the Free Software Foundation; either version 2
  20  * of the License, or (at your option) any later version.
  21  *
  22  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  23  * KIND, either express or implied.
  24  *
  25  ****************************************************************************/
  26 #include "config.h"
  27 #include "cpu.h"
  28 #include "kernel.h"
  29 #include "thread.h"
  30 #include "system.h"
  31 #include "debug.h"
  32 #include "storage.h"
  33 #include "fat.h"
  34 #include "disk.h"
  35 #include "panic.h"
  36 #include "lcd.h"
  37 #include "usb-target.h"
  38 #include "usb.h"
  39 #include "button.h"
  40 #include "string.h"
  41 #ifdef HAVE_USBSTACK
  42 #include "usb_core.h"
  43 #endif
  44 #include "logf.h"
  45 #include "screendump.h"
  46
  47 /* Conditions under which we want the entire driver */
  48 #if !defined(BOOTLOADER) || (CONFIG_CPU == SH7034) || \
  49      (defined(TOSHIBA_GIGABEAT_S) && defined(USE_ROCKBOX_USB) && defined(USB_ENABLE_STORAGE)) || \
  50      (defined(HAVE_USBSTACK) && (defined(CREATIVE_ZVx))) || \
  51      (defined(HAVE_USBSTACK) && (defined(OLYMPUS_MROBE_500))) || \
  52      (defined(HAVE_USBSTACK) && (defined(IPOD_NANO2G))) || \
  53      defined(CPU_TCC77X) || defined(CPU_TCC780X) || \
  54      (CONFIG_USBOTG == USBOTG_JZ4740) || \
  55      (defined(USE_ROCKBOX_USB) && CONFIG_USBOTG == USBOTG_AS3525) || \
  56      (defined(USE_ROCKBOX_USB) && CONFIG_USBOTG == USBOTG_AS3525v2)
  57 #define USB_FULL_INIT
  58 #endif
  59
  60 #ifdef HAVE_LCD_BITMAP
  61 bool do_screendump_instead_of_usb = false;
  62 #endif
  63
  64 #if !defined(SIMULATOR) && !defined(USB_NONE)
  65
  66 static int usb_state;
  67
  68 #if (CONFIG_STORAGE & STORAGE_MMC) && defined(USB_FULL_INIT)
  69 static int usb_mmc_countdown = 0;
  70 #endif
  71
  72 /* Make sure there's enough stack space for screendump */
  73 #ifdef USB_FULL_INIT
  74 static long usb_stack[(DEFAULT_STACK_SIZE + SECTOR_SIZE + DUMP_BMP_LINESIZE)/sizeof(long)];
  75 static const char usb_thread_name[] = "usb";
  76 static unsigned int usb_thread_entry = 0;
  77 #ifndef USB_STATUS_BY_EVENT
  78 #define NUM_POLL_READINGS (HZ/5)
  79 static int countdown;
  80 #endif /* USB_STATUS_BY_EVENT */
  81 #endif /* USB_FULL_INIT */
  82 static struct event_queue usb_queue;
  83 static bool usb_monitor_enabled;
  84 static int last_usb_status;
  85 #ifdef HAVE_USBSTACK
  86 static bool exclusive_storage_access;
  87 #endif
  88
  89 #ifdef USB_FIREWIRE_HANDLING
  90 static int firewire_countdown;
  91 static bool last_firewire_status;
  92 #endif
  93
  94 #ifdef USB_FULL_INIT
  95
  96 #if defined(USB_FIREWIRE_HANDLING) \
  97     || (defined(HAVE_USBSTACK) && !defined(USE_ROCKBOX_USB))
  98 static void try_reboot(void)
  99 {
 100 #ifdef HAVE_DISK_STORAGE
 101     storage_sleepnow(); /* Immediately spindown the disk. */
 102     sleep(HZ*2);
 103 #endif
 104
 105 #ifdef IPOD_ARCH  /* The following code is based on ipodlinux */
 106 #if CONFIG_CPU == PP5020
 107     memcpy((void *)0x40017f00, "diskmode\0\0hotstuff\0\0\1", 21);
 108 #elif CONFIG_CPU == PP5022
 109     memcpy((void *)0x4001ff00, "diskmode\0\0hotstuff\0\0\1", 21);
 110 #endif /* CONFIG_CPU */
 111 #endif /* IPOD_ARCH */
 112
 113 #ifdef IPOD_NANO2G
 114     memcpy((void *)0x0002bf00, "diskmodehotstuff\1\0\0\0", 20);
 115 #endif
 116
 117     system_reboot(); /* Reboot */
 118 }
 119 #endif /* USB_FIRWIRE_HANDLING || (HAVE_USBSTACK && !USE_ROCKBOX_USB) */
 120
 121 #ifdef HAVE_USBSTACK
 122 /* inline since branch is chosen at compile time */
 123 static inline void usb_slave_mode(bool on)
 124 {
 125 #ifdef USE_ROCKBOX_USB
 126     int rc;
 127
 128     if (on)
 129     {
 130         trigger_cpu_boost();
 131 #ifdef HAVE_PRIORITY_SCHEDULING
 132         thread_set_priority(THREAD_ID_CURRENT, PRIORITY_REALTIME);
 133 #endif
 134         disk_unmount_all();
 135         usb_attach();
 136     }
 137     else /* usb_state == USB_INSERTED (only!) */
 138     {
 139 #ifndef USB_DETECT_BY_DRV
 140         usb_enable(false);
 141 #endif
 142 #ifdef HAVE_PRIORITY_SCHEDULING
 143         thread_set_priority(THREAD_ID_CURRENT, PRIORITY_SYSTEM);
 144 #endif
 145         /* Entered exclusive mode */
 146         rc = disk_mount_all();
 147         if (rc <= 0) /* no partition */
 148             panicf("mount: %d",rc);
 149
 150         cancel_cpu_boost();
 151     }
 152 #else /* !USE_ROCKBOX_USB */
 153     if (on)
 154     {
 155         /* until we have native mass-storage mode, we want to reboot on
 156            usb host connect */
 157         try_reboot();
 158     }
 159 #endif /* USE_ROCKBOX_USB */
 160 }
 161
 162 void usb_signal_transfer_completion(
 163     struct usb_transfer_completion_event_data* event_data)
 164 {
 165     queue_post(&usb_queue, USB_TRANSFER_COMPLETION, (intptr_t)event_data);
 166 }
 167 #else  /* !HAVE_USBSTACK */
 168 /* inline since branch is chosen at compile time */
 169 static inline void usb_slave_mode(bool on)
 170 {
 171     int rc;
 172
 173     if(on)
 174     {
 175         DEBUGF("Entering USB slave mode\n");
 176         disk_unmount_all();
 177         storage_soft_reset();
 178         storage_init();
 179         storage_enable(false);
 180         usb_enable(true);
 181         cpu_idle_mode(true);
 182     }
 183     else
 184     {
 185         DEBUGF("Leaving USB slave mode\n");
 186
 187         cpu_idle_mode(false);
 188
 189         /* Let the ISDx00 settle */
 190         sleep(HZ*1);
 191
 192         usb_enable(false);
 193
 194         rc = storage_init();
 195         if(rc)
 196             panicf("storage: %d",rc);
 197
 198         rc = disk_mount_all();
 199         if (rc <= 0) /* no partition */
 200             panicf("mount: %d",rc);
 201     }
 202 }
 203 #endif /* HAVE_USBSTACK */
 204
 205 #ifdef HAVE_USB_POWER
 206 static inline bool usb_power_button(void)
 207 {
 208 #if (defined(IRIVER_H10) || defined (IRIVER_H10_5GB)) && !defined(USE_ROCKBOX_USB)
 209     return (button_status() & ~USBPOWER_BTN_IGNORE) != USBPOWER_BUTTON;
 210 #else
 211     return (button_status() & ~USBPOWER_BTN_IGNORE) == USBPOWER_BUTTON;
 212 #endif
 213 }
 214
 215 #ifdef USB_FIREWIRE_HANDLING
 216 static inline bool usb_reboot_button(void)
 217 {
 218     return (button_status() & ~USBPOWER_BTN_IGNORE) != USBPOWER_BUTTON;
 219 }
 220 #endif
 221 #endif /* HAVE_USB_POWER */
 222
 223 #ifdef USB_ENABLE_HID
 224 static bool usb_hid = true;
 225 #endif
 226
 227 static void usb_thread(void)
 228 {
 229     int num_acks_to_expect = 0;
 230     struct queue_event ev;
 231
 232     while(1)
 233     {
 234         queue_wait(&usb_queue, &ev);
 235         switch(ev.id)
 236         {
 237 #ifdef USB_DRIVER_CLOSE
 238             case USB_QUIT:
 239                 return;
 240 #endif
 241 #ifdef HAVE_USBSTACK
 242             case USB_TRANSFER_COMPLETION:
 243                 usb_core_handle_transfer_completion(
 244                     (struct usb_transfer_completion_event_data*)ev.data);
 245                 break;
 246 #endif
 247 #ifdef USB_DETECT_BY_DRV
 248             /* In this case, these events the handle cable insertion USB
 249              * driver determines INSERTED/EXTRACTED state. */
 250             case USB_POWERED:
 251                 /* Set the state to USB_POWERED for now and enable the driver
 252                  * to detect a bus reset only. If a bus reset is detected,
 253                  * USB_INSERTED will be received. */
 254                 usb_state = USB_POWERED;
 255                 usb_enable(true);
 256                 break;
 257
 258             case USB_UNPOWERED:
 259                 usb_enable(false);
 260                 /* This part shouldn't be obligatory for anything that can
 261                  * reliably detect removal of the data lines. USB_EXTRACTED
 262                  * could be posted on that event while bus power remains
 263                  * available. */
 264                 queue_post(&usb_queue, USB_EXTRACTED, 0);
 265                 break;
 266 #endif /* USB_DETECT_BY_DRV */
 267             case USB_INSERTED:
 268 #ifdef HAVE_LCD_BITMAP
 269                 if(do_screendump_instead_of_usb)
 270                 {
 271                     usb_state = USB_SCREENDUMP;
 272                     screen_dump();
 273 #ifdef HAVE_REMOTE_LCD
 274                     remote_screen_dump();
 275 #endif
 276                     break;
 277                 }
 278 #endif
 279 #ifdef HAVE_USB_POWER
 280                 if(usb_power_button())
 281                 {
 282                     /* Only charging is desired */
 283                     usb_state = USB_POWERED;
 284 #ifdef HAVE_USBSTACK
 285 #ifdef USB_ENABLE_STORAGE
 286                     usb_core_enable_driver(USB_DRIVER_MASS_STORAGE, false);
 287 #endif
 288
 289 #ifdef USB_ENABLE_HID
 290 #ifdef USB_ENABLE_CHARGING_ONLY
 291                     usb_core_enable_driver(USB_DRIVER_HID, false);
 292 #else
 293                     usb_core_enable_driver(USB_DRIVER_HID, true);
 294 #endif /* USB_ENABLE_CHARGING_ONLY */
 295 #endif /* USB_ENABLE_HID */
 296
 297 #ifdef USB_ENABLE_CHARGING_ONLY
 298                     usb_core_enable_driver(USB_DRIVER_CHARGING_ONLY, true);
 299 #endif
 300                     usb_attach();
 301 #endif
 302                     break;
 303                 }
 304 #endif /* HAVE_USB_POWER */
 305 #ifdef HAVE_USBSTACK
 306 #ifdef HAVE_USB_POWER
 307                 /* Set the state to USB_POWERED for now. If permission to connect
 308                  * by threads and storage is granted it will be changed to
 309                  * USB_CONNECTED. */
 310                 usb_state = USB_POWERED;
 311 #endif
 312 #ifdef USB_ENABLE_STORAGE
 313                 usb_core_enable_driver(USB_DRIVER_MASS_STORAGE, true);
 314 #endif
 315 #ifdef USB_ENABLE_HID
 316                 usb_core_enable_driver(USB_DRIVER_HID, usb_hid);
 317 #endif
 318 #ifdef USB_ENABLE_CHARGING_ONLY
 319                 usb_core_enable_driver(USB_DRIVER_CHARGING_ONLY, false);
 320 #endif
 321
 322                 /* Check any drivers enabled at this point for exclusive storage
 323                  * access requirements. */
 324                 exclusive_storage_access = usb_core_any_exclusive_storage();
 325
 326                 if(!exclusive_storage_access)
 327                 {
 328                     usb_attach();
 329                     break;
 330                 }
 331 #endif /* HAVE_USBSTACK */
 332                 /* Tell all threads that they have to back off the storage.
 333                    We subtract one for our own thread. */
 334                 num_acks_to_expect = queue_broadcast(SYS_USB_CONNECTED, 0) - 1;
 335                 DEBUGF("USB inserted. Waiting for ack from %d threads...\n",
 336                        num_acks_to_expect);
 337                 break;
 338
 339             case SYS_USB_CONNECTED_ACK:
 340                 if(num_acks_to_expect > 0 && --num_acks_to_expect == 0)
 341                 {
 342                     DEBUGF("All threads have acknowledged the connect.\n");
 343                     usb_slave_mode(true);
 344                     usb_state = USB_INSERTED;
 345                 }
 346                 else
 347                 {
 348                     DEBUGF("usb: got ack, %d to go...\n",
 349                            num_acks_to_expect);
 350                 }
 351                 break;
 352
 353             case USB_EXTRACTED:
 354 #ifdef HAVE_LCD_BITMAP
 355                 if(usb_state == USB_SCREENDUMP)
 356                 {
 357                     usb_state = USB_EXTRACTED;
 358                     break; /* Connected for screendump only */
 359                 }
 360 #endif
 361 #ifndef HAVE_USBSTACK /* Stack must undo this if POWERED state was transitional */
 362 #ifdef HAVE_USB_POWER
 363                 if(usb_state == USB_POWERED)
 364                 {
 365                     usb_state = USB_EXTRACTED;
 366                     break;
 367                 }
 368 #endif
 369 #endif /* HAVE_USBSTACK */
 370                 if(usb_state == USB_INSERTED)
 371                 {
 372                     /* Only disable the USB mode if we really have enabled it
 373                        some threads might not have acknowledged the
 374                        insertion */
 375                     usb_slave_mode(false);
 376                 }
 377
 378                 usb_state = USB_EXTRACTED;
 379 #ifdef HAVE_USBSTACK
 380                 if(!exclusive_storage_access)
 381                 {
 382 #ifndef USB_DETECT_BY_DRV /* Disabled handling USB_UNPOWERED */
 383                     usb_enable(false);
 384 #endif
 385                     break;
 386                 }
 387
 388 #endif /* HAVE_USBSTACK */
 389                 num_acks_to_expect = usb_release_exclusive_storage();
 390
 391                 break;
 392
 393             case SYS_USB_DISCONNECTED_ACK:
 394                 if(num_acks_to_expect > 0 && --num_acks_to_expect == 0)
 395                 {
 396                     DEBUGF("All threads have acknowledged. "
 397                            "We're in business.\n");
 398                 }
 399                 else
 400                 {
 401                     DEBUGF("usb: got ack, %d to go...\n",
 402                            num_acks_to_expect);
 403                 }
 404                 break;
 405
 406 #ifdef HAVE_HOTSWAP
 407             case SYS_HOTSWAP_INSERTED:
 408             case SYS_HOTSWAP_EXTRACTED:
 409 #ifdef HAVE_USBSTACK
 410                 usb_core_hotswap_event(1,ev.id == SYS_HOTSWAP_INSERTED);
 411 #else  /* !HAVE_USBSTACK */
 412                 if(usb_state == USB_INSERTED)
 413                 {
 414 #if (CONFIG_STORAGE & STORAGE_MMC)
 415                     usb_enable(false);
 416                     usb_mmc_countdown = HZ/2; /* re-enable after 0.5 sec */
 417 #endif /* STORAGE_MMC */
 418                 }
 419 #endif /* HAVE_USBSTACK */
 420                 break;
 421
 422 #if (CONFIG_STORAGE & STORAGE_MMC)
 423             case USB_REENABLE:
 424                 if(usb_state == USB_INSERTED)
 425                     usb_enable(true);  /* reenable only if still inserted */
 426                 break;
 427 #endif /* STORAGE_MMC */
 428 #endif /* HAVE_HOTSWAP */
 429
 430 #ifdef USB_FIREWIRE_HANDLING
 431             case USB_REQUEST_REBOOT:
 432 #ifdef HAVE_USB_POWER
 433                 if (usb_reboot_button())
 434 #endif
 435                     try_reboot();
 436                 break;
 437 #endif /* USB_FIREWIRE_HANDLING */
 438
 439 #if defined(HAVE_USB_CHARGING_ENABLE) && defined(HAVE_USBSTACK)
 440             case USB_CHARGER_UPDATE:
 441                 usb_charging_maxcurrent_change(usb_charging_maxcurrent());
 442                 break;
 443 #endif
 444         }
 445     }
 446 }
 447
 448 #if defined(HAVE_USB_CHARGING_ENABLE) && defined(HAVE_USBSTACK)
 449 void usb_charger_update(void)
 450 {
 451     queue_post(&usb_queue, USB_CHARGER_UPDATE, 0);
 452 }
 453 #endif
 454
 455 #ifdef USB_STATUS_BY_EVENT
 456 void usb_status_event(int current_status)
 457 {
 458     /* Caller isn't expected to filter for changes in status.
 459      * current_status:
 460      *   USB_DETECT_BY_DRV: USB_POWERED, USB_UNPOWERED, USB_INSERTED (driver)
 461      *                else: USB_INSERTED, USB_EXTRACTED
 462      */
 463     if(usb_monitor_enabled)
 464     {
 465         int oldstatus = disable_irq_save(); /* Dual-use function */
 466
 467         if(last_usb_status != current_status)
 468         {
 469             last_usb_status = current_status;
 470             queue_post(&usb_queue, current_status, 0);
 471         }
 472
 473         restore_irq(oldstatus);
 474     }
 475 }
 476
 477 void usb_start_monitoring(void)
 478 {
 479     int oldstatus = disable_irq_save(); /* Sync to event */
 480     int status = usb_detect();
 481
 482     usb_monitor_enabled = true;
 483
 484 #ifdef USB_DETECT_BY_DRV
 485     status = (status == USB_INSERTED) ? USB_POWERED : USB_UNPOWERED;
 486 #endif
 487     usb_status_event(status);
 488
 489 #ifdef USB_FIREWIRE_HANDLING
 490     if (firewire_detect())
 491         usb_firewire_connect_event();
 492 #endif
 493
 494     restore_irq(oldstatus);
 495 }
 496
 497 #ifdef USB_FIREWIRE_HANDLING
 498 void usb_firewire_connect_event(void)
 499 {
 500     queue_post(&usb_queue, USB_REQUEST_REBOOT, 0);
 501 }
 502 #endif /* USB_FIREWIRE_HANDLING */
 503 #else /* !USB_STATUS_BY_EVENT */
 504 static void usb_tick(void)
 505 {
 506     int current_status;
 507
 508     if(usb_monitor_enabled)
 509     {
 510 #ifdef USB_FIREWIRE_HANDLING
 511         int current_firewire_status = firewire_detect();
 512         if(current_firewire_status != last_firewire_status)
 513         {
 514             last_firewire_status = current_firewire_status;
 515             firewire_countdown = NUM_POLL_READINGS;
 516         }
 517         else
 518         {
 519             /* Count down until it gets negative */
 520             if(firewire_countdown >= 0)
 521                 firewire_countdown--;
 522
 523             /* Report to the thread if we have had 3 identical status
 524                readings in a row */
 525             if(firewire_countdown == 0)
 526             {
 527                 queue_post(&usb_queue, USB_REQUEST_REBOOT, 0);
 528             }
 529         }
 530 #endif /* USB_FIREWIRE_HANDLING */
 531
 532         current_status = usb_detect();
 533
 534         /* Only report when the status has changed */
 535         if(current_status != last_usb_status)
 536         {
 537             last_usb_status = current_status;
 538             countdown = NUM_POLL_READINGS;
 539         }
 540         else
 541         {
 542             /* Count down until it gets negative */
 543             if(countdown >= 0)
 544                 countdown--;
 545
 546             /* Report to the thread if we have had 3 identical status
 547                readings in a row */
 548             if(countdown == 0)
 549             {
 550                 queue_post(&usb_queue, current_status, 0);
 551             }
 552         }
 553     }
 554 #if (CONFIG_STORAGE & STORAGE_MMC)
 555     if(usb_mmc_countdown > 0)
 556     {
 557         usb_mmc_countdown--;
 558         if (usb_mmc_countdown == 0)
 559             queue_post(&usb_queue, USB_REENABLE, 0);
 560     }
 561 #endif
 562 }
 563
 564 void usb_start_monitoring(void)
 565 {
 566     usb_monitor_enabled = true;
 567 }
 568 #endif /* USB_STATUS_BY_EVENT */
 569 #endif /* USB_FULL_INIT */
 570
 571 void usb_acknowledge(long id)
 572 {
 573     queue_post(&usb_queue, id, 0);
 574 }
 575
 576 void usb_init(void)
 577 {
 578     /* We assume that the USB cable is extracted */
 579     usb_state = USB_EXTRACTED;
 580 #ifdef USB_DETECT_BY_DRV
 581     last_usb_status = USB_UNPOWERED;
 582 #else
 583     last_usb_status = USB_EXTRACTED;
 584 #endif
 585     usb_monitor_enabled = false;
 586
 587 #ifdef HAVE_USBSTACK
 588     exclusive_storage_access = false;
 589 #endif
 590
 591 #ifdef USB_FIREWIRE_HANDLING
 592     firewire_countdown = -1;
 593     last_firewire_status = false;
 594 #endif
 595
 596     usb_init_device();
 597 #ifdef USB_FULL_INIT
 598     usb_enable(false);
 599
 600     queue_init(&usb_queue, true);
 601
 602     usb_thread_entry = create_thread(usb_thread, usb_stack,
 603                        sizeof(usb_stack), 0, usb_thread_name
 604                        IF_PRIO(, PRIORITY_SYSTEM) IF_COP(, CPU));
 605
 606 #ifndef USB_STATUS_BY_EVENT
 607     countdown = -1;
 608     tick_add_task(usb_tick);
 609 #endif
 610 #endif /* USB_FULL_INIT */
 611 }
 612
 613 void usb_wait_for_disconnect(struct event_queue *q)
 614 {
 615 #ifdef USB_FULL_INIT
 616     struct queue_event ev;
 617
 618     /* Don't return until we get SYS_USB_DISCONNECTED */
 619     while(1)
 620     {
 621         queue_wait(q, &ev);
 622         if(ev.id == SYS_USB_DISCONNECTED)
 623         {
 624             usb_acknowledge(SYS_USB_DISCONNECTED_ACK);
 625             return;
 626         }
 627     }
 628 #else
 629     (void)q;
 630 #endif /* USB_FULL_INIT */
 631 }
 632
 633 int usb_wait_for_disconnect_w_tmo(struct event_queue *q, int ticks)
 634 {
 635 #ifdef USB_FULL_INIT
 636     struct queue_event ev;
 637
 638     /* Don't return until we get SYS_USB_DISCONNECTED or SYS_TIMEOUT */
 639     while(1)
 640     {
 641         queue_wait_w_tmo(q, &ev, ticks);
 642         switch(ev.id)
 643         {
 644             case SYS_USB_DISCONNECTED:
 645                 usb_acknowledge(SYS_USB_DISCONNECTED_ACK);
 646                 return 0;
 647             case SYS_TIMEOUT:
 648                 return 1;
 649         }
 650     }
 651 #else
 652     (void)q; (void)ticks;
 653     return 0;
 654 #endif /* USB_FULL_INIT */
 655 }
 656
 657 #ifdef USB_DRIVER_CLOSE
 658 void usb_close(void)
 659 {
 660     unsigned int thread = usb_thread_entry;
 661     usb_thread_entry = 0;
 662
 663     if (thread == 0)
 664         return;
 665
 666 #ifndef USB_STATUS_BY_EVENT
 667     tick_remove_task(usb_tick);
 668 #endif
 669     usb_monitor_enabled = false;
 670
 671     queue_post(&usb_queue, USB_QUIT, 0);
 672     thread_wait(thread);
 673 }
 674 #endif /* USB_DRIVER_CLOSE */
 675
 676 bool usb_inserted(void)
 677 {
 678 #ifdef HAVE_USB_POWER
 679     return usb_state == USB_INSERTED || usb_state == USB_POWERED;
 680 #else
 681     return usb_state == USB_INSERTED;
 682 #endif
 683 }
 684
 685 #ifdef HAVE_USBSTACK
 686 bool usb_exclusive_storage(void)
 687 {
 688     return exclusive_storage_access;
 689 }
 690 #endif
 691
 692 int usb_release_exclusive_storage(void)
 693 {
 694     int num_acks_to_expect;
 695 #ifdef HAVE_USBSTACK
 696     exclusive_storage_access = false;
 697 #endif /* HAVE_USBSTACK */
 698     /* Tell all threads that we are back in business */
 699     num_acks_to_expect =
 700         queue_broadcast(SYS_USB_DISCONNECTED, 0) - 1;
 701     DEBUGF("USB extracted. Waiting for ack from %d threads...\n",
 702            num_acks_to_expect);
 703     return num_acks_to_expect;
 704 }
 705
 706 #ifdef HAVE_USB_POWER
 707 bool usb_powered(void)
 708 {
 709     return usb_state == USB_POWERED;
 710 }
 711 #endif
 712
 713 #ifdef USB_ENABLE_HID
 714 void usb_set_hid(bool enable)
 715 {
 716     usb_hid = enable;
 717     usb_core_enable_driver(USB_DRIVER_HID, usb_hid);
 718 }
 719 #endif
 720
 721 #else
 722
 723 #ifdef USB_NONE
 724 bool usb_inserted(void)
 725 {
 726     return false;
 727 }
 728 #endif
 729
 730 /* Dummy simulator functions */
 731 void usb_acknowledge(long id)
 732 {
 733     id = id;
 734 }
 735
 736 void usb_init(void)
 737 {
 738 }
 739
 740 void usb_start_monitoring(void)
 741 {
 742 }
 743
 744 int usb_detect(void)
 745 {
 746     return USB_EXTRACTED;
 747 }
 748
 749 void usb_wait_for_disconnect(struct event_queue *q)
 750 {
 751    (void)q;
 752 }
 753
 754 #endif /* USB_NONE or SIMULATOR */