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 "sprintf.h"
  41 #include "string.h"
  42 #ifdef HAVE_USBSTACK
  43 #include "usb_core.h"
  44 #endif
  45 #include "logf.h"
  46 #include "screendump.h"
  47
  48 /* Conditions under which we want the entire driver */
  49 #if !defined(BOOTLOADER) || (CONFIG_CPU == SH7034) || \
  50      (defined(TOSHIBA_GIGABEAT_S) && defined(USE_ROCKBOX_USB) && defined(USB_ENABLE_STORAGE)) || \
  51      (defined(HAVE_USBSTACK) && (defined(CREATIVE_ZVx))) || \
  52      (defined(HAVE_USBSTACK) && (defined(OLYMPUS_MROBE_500))) || \
  53      (defined(HAVE_USBSTACK) && (defined(IPOD_NANO2G))) || \
  54      defined(CPU_TCC77X) || defined(CPU_TCC780X) || \
  55      (CONFIG_USBOTG == USBOTG_JZ4740)
  56 #define USB_FULL_INIT
  57 #endif
  58
  59 #ifdef HAVE_LCD_BITMAP
  60 bool do_screendump_instead_of_usb = false;
  61 #endif
  62
  63 #if !defined(SIMULATOR) && !defined(USB_NONE)
  64
  65 static int usb_state;
  66
  67 #if (CONFIG_STORAGE & STORAGE_MMC) && defined(USB_FULL_INIT)
  68 static int usb_mmc_countdown = 0;
  69 #endif
  70
  71 /* FIXME: The extra 0x800 is consumed by fat_mount() when the fsinfo
  72    needs updating */
  73 #ifdef USB_FULL_INIT
  74 static long usb_stack[(DEFAULT_STACK_SIZE + 0x800)/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         usb_attach();
 135     }
 136     else /* usb_state == USB_INSERTED (only!) */
 137     {
 138 #ifndef USB_DETECT_BY_DRV
 139         usb_enable(false);
 140 #endif
 141 #ifdef HAVE_PRIORITY_SCHEDULING
 142         thread_set_priority(THREAD_ID_CURRENT, PRIORITY_SYSTEM);
 143 #endif
 144         /* Entered exclusive mode */
 145         rc = disk_mount_all();
 146         if (rc <= 0) /* no partition */
 147             panicf("mount: %d",rc);
 148
 149         cancel_cpu_boost();
 150     }
 151 #else /* !USE_ROCKBOX_USB */
 152     if (on)
 153     {
 154         /* until we have native mass-storage mode, we want to reboot on
 155            usb host connect */
 156         try_reboot();
 157     }
 158 #endif /* USE_ROCKBOX_USB */
 159 }
 160
 161 void usb_signal_transfer_completion(
 162     struct usb_transfer_completion_event_data* event_data)
 163 {
 164     queue_post(&usb_queue, USB_TRANSFER_COMPLETION, (intptr_t)event_data);
 165 }
 166 #else  /* !HAVE_USBSTACK */
 167 /* inline since branch is chosen at compile time */
 168 static inline void usb_slave_mode(bool on)
 169 {
 170     int rc;
 171
 172     if(on)
 173     {
 174         DEBUGF("Entering USB slave mode\n");
 175         storage_soft_reset();
 176         storage_init();
 177         storage_enable(false);
 178         usb_enable(true);
 179         cpu_idle_mode(true);
 180     }
 181     else
 182     {
 183         DEBUGF("Leaving USB slave mode\n");
 184
 185         cpu_idle_mode(false);
 186
 187         /* Let the ISDx00 settle */
 188         sleep(HZ*1);
 189
 190         usb_enable(false);
 191
 192         rc = storage_init();
 193         if(rc)
 194             panicf("storage: %d",rc);
 195
 196         rc = disk_mount_all();
 197         if (rc <= 0) /* no partition */
 198             panicf("mount: %d",rc);
 199     }
 200 }
 201 #endif /* HAVE_USBSTACK */
 202
 203 #ifdef HAVE_USB_POWER
 204 static inline bool usb_power_button(void)
 205 {
 206 #if (defined(IRIVER_H10) || defined (IRIVER_H10_5GB)) && !defined(USE_ROCKBOX_USB)
 207     return (button_status() & ~USBPOWER_BTN_IGNORE) != USBPOWER_BUTTON;
 208 #else
 209     return (button_status() & ~USBPOWER_BTN_IGNORE) == USBPOWER_BUTTON;
 210 #endif
 211 }
 212
 213 #ifdef USB_FIREWIRE_HANDLING
 214 static inline bool usb_reboot_button(void)
 215 {
 216     return (button_status() & ~USBPOWER_BTN_IGNORE) != USBPOWER_BUTTON;
 217 }
 218 #endif
 219 #endif /* HAVE_USB_POWER */
 220
 221 #ifdef USB_ENABLE_HID
 222 static bool usb_hid = true;
 223 #endif
 224
 225 static void usb_thread(void)
 226 {
 227     int num_acks_to_expect = 0;
 228     struct queue_event ev;
 229
 230     while(1)
 231     {
 232         queue_wait(&usb_queue, &ev);
 233         switch(ev.id)
 234         {
 235 #ifdef USB_DRIVER_CLOSE
 236             case USB_QUIT:
 237                 return;
 238 #endif
 239 #ifdef HAVE_USBSTACK
 240             case USB_TRANSFER_COMPLETION:
 241                 usb_core_handle_transfer_completion(
 242                     (struct usb_transfer_completion_event_data*)ev.data);
 243                 break;
 244 #endif
 245 #ifdef USB_DETECT_BY_DRV
 246             /* In this case, these events the handle cable insertion USB
 247              * driver determines INSERTED/EXTRACTED state. */
 248             case USB_POWERED:
 249                 /* Set the state to USB_POWERED for now and enable the driver
 250                  * to detect a bus reset only. If a bus reset is detected,
 251                  * USB_INSERTED will be received. */
 252                 usb_state = USB_POWERED;
 253                 usb_enable(true);
 254                 break;
 255
 256             case USB_UNPOWERED:
 257                 usb_enable(false);
 258                 /* This part shouldn't be obligatory for anything that can
 259                  * reliably detect removal of the data lines. USB_EXTRACTED
 260                  * could be posted on that event while bus power remains
 261                  * available. */
 262                 queue_post(&usb_queue, USB_EXTRACTED, 0);
 263                 break;
 264 #endif /* USB_DETECT_BY_DRV */
 265             case USB_INSERTED:
 266 #ifdef HAVE_LCD_BITMAP
 267                 if(do_screendump_instead_of_usb)
 268                 {
 269                     usb_state = USB_SCREENDUMP;
 270                     screen_dump();
 271 #ifdef HAVE_REMOTE_LCD
 272                     remote_screen_dump();
 273 #endif
 274                     break;
 275                 }
 276 #endif
 277 #ifdef HAVE_USB_POWER
 278                 if(usb_power_button())
 279                 {
 280                     /* Only charging is desired */
 281                     usb_state = USB_POWERED;
 282 #ifdef HAVE_USBSTACK
 283 #ifdef USB_ENABLE_STORAGE
 284                     usb_core_enable_driver(USB_DRIVER_MASS_STORAGE, false);
 285 #endif
 286
 287 #ifdef USB_ENABLE_HID
 288 #ifdef USB_ENABLE_CHARGING_ONLY
 289                     usb_core_enable_driver(USB_DRIVER_HID, false);
 290 #else
 291                     usb_core_enable_driver(USB_DRIVER_HID, true);
 292 #endif /* USB_ENABLE_CHARGING_ONLY */
 293 #endif /* USB_ENABLE_HID */
 294
 295 #ifdef USB_ENABLE_CHARGING_ONLY
 296                     usb_core_enable_driver(USB_DRIVER_CHARGING_ONLY, true);
 297 #endif
 298                     usb_attach();
 299 #endif
 300                     break;
 301                 }
 302 #endif /* HAVE_USB_POWER */
 303 #ifdef HAVE_USBSTACK
 304 #ifdef HAVE_USB_POWER
 305                 /* Set the state to USB_POWERED for now. If permission to connect
 306                  * by threads and storage is granted it will be changed to
 307                  * USB_CONNECTED. */
 308                 usb_state = USB_POWERED;
 309 #endif
 310 #ifdef USB_ENABLE_STORAGE
 311                 usb_core_enable_driver(USB_DRIVER_MASS_STORAGE, true);
 312 #endif
 313 #ifdef USB_ENABLE_HID
 314                 usb_core_enable_driver(USB_DRIVER_HID, usb_hid);
 315 #endif
 316 #ifdef USB_ENABLE_CHARGING_ONLY
 317                 usb_core_enable_driver(USB_DRIVER_CHARGING_ONLY, false);
 318 #endif
 319
 320                 /* Check any drivers enabled at this point for exclusive storage
 321                  * access requirements. */
 322                 exclusive_storage_access = usb_core_any_exclusive_storage();
 323
 324                 if(!exclusive_storage_access)
 325                 {
 326                     usb_attach();
 327                     break;
 328                 }
 329 #endif /* HAVE_USBSTACK */
 330                 /* Tell all threads that they have to back off the storage.
 331                    We subtract one for our own thread. */
 332                 num_acks_to_expect = queue_broadcast(SYS_USB_CONNECTED, 0) - 1;
 333                 DEBUGF("USB inserted. Waiting for ack from %d threads...\n",
 334                        num_acks_to_expect);
 335                 break;
 336
 337             case SYS_USB_CONNECTED_ACK:
 338                 if(num_acks_to_expect > 0 && --num_acks_to_expect == 0)
 339                 {
 340                     DEBUGF("All threads have acknowledged the connect.\n");
 341                     usb_slave_mode(true);
 342                     usb_state = USB_INSERTED;
 343                 }
 344                 else
 345                 {
 346                     DEBUGF("usb: got ack, %d to go...\n",
 347                            num_acks_to_expect);
 348                 }
 349                 break;
 350
 351             case USB_EXTRACTED:
 352 #ifdef HAVE_LCD_BITMAP
 353                 if(usb_state == USB_SCREENDUMP)
 354                 {
 355                     usb_state = USB_EXTRACTED;
 356                     break; /* Connected for screendump only */
 357                 }
 358 #endif
 359 #ifndef HAVE_USBSTACK /* Stack must undo this if POWERED state was transitional */
 360 #ifdef HAVE_USB_POWER
 361                 if(usb_state == USB_POWERED)
 362                 {
 363                     usb_state = USB_EXTRACTED;
 364                     break;
 365                 }
 366 #endif
 367 #endif /* HAVE_USBSTACK */
 368                 if(usb_state == USB_INSERTED)
 369                 {
 370                     /* Only disable the USB mode if we really have enabled it
 371                        some threads might not have acknowledged the
 372                        insertion */
 373                     usb_slave_mode(false);
 374                 }
 375
 376                 usb_state = USB_EXTRACTED;
 377 #ifdef HAVE_USBSTACK
 378                 if(!exclusive_storage_access)
 379                 {
 380 #ifndef USB_DETECT_BY_DRV /* Disabled handling USB_UNPOWERED */
 381                     usb_enable(false);
 382 #endif
 383                     break;
 384                 }
 385
 386 #endif /* HAVE_USBSTACK */
 387                 num_acks_to_expect = usb_release_exclusive_storage();
 388
 389                 break;
 390
 391             case SYS_USB_DISCONNECTED_ACK:
 392                 if(num_acks_to_expect > 0 && --num_acks_to_expect == 0)
 393                 {
 394                     DEBUGF("All threads have acknowledged. "
 395                            "We're in business.\n");
 396                 }
 397                 else
 398                 {
 399                     DEBUGF("usb: got ack, %d to go...\n",
 400                            num_acks_to_expect);
 401                 }
 402                 break;
 403
 404 #ifdef HAVE_HOTSWAP
 405             case SYS_HOTSWAP_INSERTED:
 406             case SYS_HOTSWAP_EXTRACTED:
 407 #ifdef HAVE_USBSTACK
 408                 usb_core_hotswap_event(1,ev.id == SYS_HOTSWAP_INSERTED);
 409 #else  /* !HAVE_USBSTACK */
 410                 if(usb_state == USB_INSERTED)
 411                 {
 412                     usb_enable(false);
 413 #if (CONFIG_STORAGE & STORAGE_MMC)
 414                     usb_mmc_countdown = HZ/2; /* re-enable after 0.5 sec */
 415 #endif /* STORAGE_MMC */
 416                 }
 417 #endif /* HAVE_USBSTACK */
 418                 break;
 419
 420 #if (CONFIG_STORAGE & STORAGE_MMC)
 421             case USB_REENABLE:
 422                 if(usb_state == USB_INSERTED)
 423                     usb_enable(true);  /* reenable only if still inserted */
 424                 break;
 425 #endif /* STORAGE_MMC */
 426 #endif /* HAVE_HOTSWAP */
 427
 428 #ifdef USB_FIREWIRE_HANDLING
 429             case USB_REQUEST_REBOOT:
 430 #ifdef HAVE_USB_POWER
 431                 if (usb_reboot_button())
 432 #endif
 433                     try_reboot();
 434                 break;
 435 #endif /* USB_FIREWIRE_HANDLING */
 436         }
 437     }
 438 }
 439
 440 #ifdef USB_STATUS_BY_EVENT
 441 void usb_status_event(int current_status)
 442 {
 443     /* Caller isn't expected to filter for changes in status.
 444      * current_status:
 445      *   USB_DETECT_BY_DRV: USB_POWERED, USB_UNPOWERED, USB_INSERTED (driver)
 446      *                else: USB_INSERTED, USB_EXTRACTED
 447      */
 448     if(usb_monitor_enabled)
 449     {
 450         int oldstatus = disable_irq_save(); /* Dual-use function */
 451
 452         if(last_usb_status != current_status)
 453         {
 454             last_usb_status = current_status;
 455             queue_post(&usb_queue, current_status, 0);
 456         }
 457
 458         restore_irq(oldstatus);
 459     }
 460 }
 461
 462 void usb_start_monitoring(void)
 463 {
 464     int oldstatus = disable_irq_save(); /* Sync to event */
 465     int status = usb_detect();
 466
 467     usb_monitor_enabled = true;
 468
 469 #ifdef USB_DETECT_BY_DRV
 470     status = (status == USB_INSERTED) ? USB_POWERED : USB_UNPOWERED;
 471 #endif
 472     usb_status_event(status);
 473
 474 #ifdef USB_FIREWIRE_HANDLING
 475     if (firewire_detect())
 476         usb_firewire_connect_event();
 477 #endif
 478
 479     restore_irq(oldstatus);
 480 }
 481
 482 #ifdef USB_FIREWIRE_HANDLING
 483 void usb_firewire_connect_event(void)
 484 {
 485     queue_post(&usb_queue, USB_REQUEST_REBOOT, 0);
 486 }
 487 #endif /* USB_FIREWIRE_HANDLING */
 488 #else /* !USB_STATUS_BY_EVENT */
 489 static void usb_tick(void)
 490 {
 491     int current_status;
 492
 493     if(usb_monitor_enabled)
 494     {
 495 #ifdef USB_FIREWIRE_HANDLING
 496         int current_firewire_status = firewire_detect();
 497         if(current_firewire_status != last_firewire_status)
 498         {
 499             last_firewire_status = current_firewire_status;
 500             firewire_countdown = NUM_POLL_READINGS;
 501         }
 502         else
 503         {
 504             /* Count down until it gets negative */
 505             if(firewire_countdown >= 0)
 506                 firewire_countdown--;
 507
 508             /* Report to the thread if we have had 3 identical status
 509                readings in a row */
 510             if(firewire_countdown == 0)
 511             {
 512                 queue_post(&usb_queue, USB_REQUEST_REBOOT, 0);
 513             }
 514         }
 515 #endif /* USB_FIREWIRE_HANDLING */
 516
 517         current_status = usb_detect();
 518
 519         /* Only report when the status has changed */
 520         if(current_status != last_usb_status)
 521         {
 522             last_usb_status = current_status;
 523             countdown = NUM_POLL_READINGS;
 524         }
 525         else
 526         {
 527             /* Count down until it gets negative */
 528             if(countdown >= 0)
 529                 countdown--;
 530
 531             /* Report to the thread if we have had 3 identical status
 532                readings in a row */
 533             if(countdown == 0)
 534             {
 535                 queue_post(&usb_queue, current_status, 0);
 536             }
 537         }
 538     }
 539 #if (CONFIG_STORAGE & STORAGE_MMC)
 540     if(usb_mmc_countdown > 0)
 541     {
 542         usb_mmc_countdown--;
 543         if (usb_mmc_countdown == 0)
 544             queue_post(&usb_queue, USB_REENABLE, 0);
 545     }
 546 #endif
 547 }
 548
 549 void usb_start_monitoring(void)
 550 {
 551     usb_monitor_enabled = true;
 552 }
 553 #endif /* USB_STATUS_BY_EVENT */
 554 #endif /* USB_FULL_INIT */
 555
 556 void usb_acknowledge(long id)
 557 {
 558     queue_post(&usb_queue, id, 0);
 559 }
 560
 561 void usb_init(void)
 562 {
 563     /* We assume that the USB cable is extracted */
 564     usb_state = USB_EXTRACTED;
 565 #ifdef USB_DETECT_BY_DRV
 566     last_usb_status = USB_UNPOWERED;
 567 #else
 568     last_usb_status = USB_EXTRACTED;
 569 #endif
 570     usb_monitor_enabled = false;
 571
 572 #ifdef HAVE_USBSTACK
 573     exclusive_storage_access = false;
 574 #endif
 575
 576 #ifdef USB_FIREWIRE_HANDLING
 577     firewire_countdown = -1;
 578     last_firewire_status = false;
 579 #endif
 580
 581     usb_init_device();
 582 #ifdef USB_FULL_INIT
 583     usb_enable(false);
 584
 585     queue_init(&usb_queue, true);
 586
 587     usb_thread_entry = create_thread(usb_thread, usb_stack,
 588                        sizeof(usb_stack), 0, usb_thread_name
 589                        IF_PRIO(, PRIORITY_SYSTEM) IF_COP(, CPU));
 590
 591 #ifndef USB_STATUS_BY_EVENT
 592     countdown = -1;
 593     tick_add_task(usb_tick);
 594 #endif
 595 #endif /* USB_FULL_INIT */
 596 }
 597
 598 void usb_wait_for_disconnect(struct event_queue *q)
 599 {
 600 #ifdef USB_FULL_INIT
 601     struct queue_event ev;
 602
 603     /* Don't return until we get SYS_USB_DISCONNECTED */
 604     while(1)
 605     {
 606         queue_wait(q, &ev);
 607         if(ev.id == SYS_USB_DISCONNECTED)
 608         {
 609             usb_acknowledge(SYS_USB_DISCONNECTED_ACK);
 610             return;
 611         }
 612     }
 613 #else
 614     (void)q;
 615 #endif /* USB_FULL_INIT */
 616 }
 617
 618 int usb_wait_for_disconnect_w_tmo(struct event_queue *q, int ticks)
 619 {
 620 #ifdef USB_FULL_INIT
 621     struct queue_event ev;
 622
 623     /* Don't return until we get SYS_USB_DISCONNECTED or SYS_TIMEOUT */
 624     while(1)
 625     {
 626         queue_wait_w_tmo(q, &ev, ticks);
 627         switch(ev.id)
 628         {
 629             case SYS_USB_DISCONNECTED:
 630                 usb_acknowledge(SYS_USB_DISCONNECTED_ACK);
 631                 return 0;
 632             case SYS_TIMEOUT:
 633                 return 1;
 634         }
 635     }
 636 #else
 637     (void)q; (void)ticks;
 638     return 0;
 639 #endif /* USB_FULL_INIT */
 640 }
 641
 642 #ifdef USB_DRIVER_CLOSE
 643 void usb_close(void)
 644 {
 645     unsigned int thread = usb_thread_entry;
 646     usb_thread_entry = 0;
 647
 648     if (thread == 0)
 649         return;
 650
 651 #ifndef USB_STATUS_BY_EVENT
 652     tick_remove_task(usb_tick);
 653 #endif
 654     usb_monitor_enabled = false;
 655
 656     queue_post(&usb_queue, USB_QUIT, 0);
 657     thread_wait(thread);
 658 }
 659 #endif /* USB_DRIVER_CLOSE */
 660
 661 bool usb_inserted(void)
 662 {
 663 #ifdef HAVE_USB_POWER
 664     return usb_state == USB_INSERTED || usb_state == USB_POWERED;
 665 #else
 666     return usb_state == USB_INSERTED;
 667 #endif
 668 }
 669
 670 #ifdef HAVE_USBSTACK
 671 bool usb_exclusive_storage(void)
 672 {
 673     return exclusive_storage_access;
 674 }
 675 #endif
 676
 677 int usb_release_exclusive_storage(void)
 678 {
 679     int num_acks_to_expect;
 680 #ifdef HAVE_USBSTACK
 681     exclusive_storage_access = false;
 682 #endif /* HAVE_USBSTACK */
 683     /* Tell all threads that we are back in business */
 684     num_acks_to_expect =
 685         queue_broadcast(SYS_USB_DISCONNECTED, 0) - 1;
 686     DEBUGF("USB extracted. Waiting for ack from %d threads...\n",
 687            num_acks_to_expect);
 688     return num_acks_to_expect;
 689 }
 690
 691 #ifdef HAVE_USB_POWER
 692 bool usb_powered(void)
 693 {
 694     return usb_state == USB_POWERED;
 695 }
 696 #endif
 697
 698 #ifdef USB_ENABLE_HID
 699 void usb_set_hid(bool enable)
 700 {
 701     usb_hid = enable;
 702     usb_core_enable_driver(USB_DRIVER_HID, usb_hid);
 703 }
 704 #endif
 705
 706 #else
 707
 708 #ifdef USB_NONE
 709 bool usb_inserted(void)
 710 {
 711     return false;
 712 }
 713 #endif
 714
 715 /* Dummy simulator functions */
 716 void usb_acknowledge(long id)
 717 {
 718     id = id;
 719 }
 720
 721 void usb_init(void)
 722 {
 723 }
 724
 725 void usb_start_monitoring(void)
 726 {
 727 }
 728
 729 int usb_detect(void)
 730 {
 731     return USB_EXTRACTED;
 732 }
 733
 734 void usb_wait_for_disconnect(struct event_queue *q)
 735 {
 736    (void)q;
 737 }
 738
 739 #endif /* USB_NONE or SIMULATOR */