sys/dev/acpica/acpi_dock.c

   1 /*-
   2  * Copyright (c) 2005-2006 Mitsuru IWASAKI <iwasaki@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD$
  27  */
  28
  29 #include "opt_acpi.h"
  30 #include <sys/param.h>
  31 #include <sys/bus.h>
  32 #include <sys/kernel.h>
  33 #include <sys/module.h>
  34
  35 #include <contrib/dev/acpica/include/acpi.h>
  36 #include <contrib/dev/acpica/include/accommon.h>
  37
  38 #include <dev/acpica/acpivar.h>
  39 #include <dev/acpica/acpiio.h>
  40
  41 /* Hooks for the ACPI CA debugging infrastructure */
  42 #define _COMPONENT      ACPI_DOCK
  43 ACPI_MODULE_NAME("DOCK")
  44
  45 /* For Docking status */
  46 #define ACPI_DOCK_STATUS_UNKNOWN        -1
  47 #define ACPI_DOCK_STATUS_UNDOCKED       0
  48 #define ACPI_DOCK_STATUS_DOCKED         1
  49
  50 #define ACPI_DOCK_UNLOCK                0 /* Allow device to be ejected */
  51 #define ACPI_DOCK_LOCK                  1 /* Prevent dev from being removed */
  52
  53 #define ACPI_DOCK_ISOLATE               0 /* Isolate from dock connector */
  54 #define ACPI_DOCK_CONNECT               1 /* Connect to dock */
  55
  56 struct acpi_dock_softc {
  57         int             _sta;
  58         int             _bdn;
  59         int             _uid;
  60         int             status;
  61         struct sysctl_ctx_list  *sysctl_ctx;
  62         struct sysctl_oid       *sysctl_tree;
  63 };
  64
  65 ACPI_SERIAL_DECL(dock, "ACPI Docking Station");
  66
  67 /*
  68  * Utility functions
  69  */
  70
  71 static void
  72 acpi_dock_get_info(device_t dev)
  73 {
  74         struct acpi_dock_softc *sc;
  75         ACPI_HANDLE     h;
  76
  77         sc = device_get_softc(dev);
  78         h = acpi_get_handle(dev);
  79
  80         if (ACPI_FAILURE(acpi_GetInteger(h, "_STA", &sc->_sta)))
  81                 sc->_sta = ACPI_DOCK_STATUS_UNKNOWN;
  82         if (ACPI_FAILURE(acpi_GetInteger(h, "_BDN", &sc->_bdn)))
  83                 sc->_bdn = ACPI_DOCK_STATUS_UNKNOWN;
  84         if (ACPI_FAILURE(acpi_GetInteger(h, "_UID", &sc->_uid)))
  85                 sc->_uid = ACPI_DOCK_STATUS_UNKNOWN;
  86         ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  87                     "_STA: %04x, _BDN: %04x, _UID: %04x\n", sc->_sta,
  88                     sc->_bdn, sc->_uid);
  89 }
  90
  91 static int
  92 acpi_dock_execute_dck(device_t dev, int dock)
  93 {
  94         ACPI_HANDLE     h;
  95         ACPI_OBJECT     argobj;
  96         ACPI_OBJECT_LIST args;
  97         ACPI_BUFFER     buf;
  98         ACPI_OBJECT     retobj;
  99         ACPI_STATUS     status;
 100
 101         h = acpi_get_handle(dev);
 102
 103         argobj.Type = ACPI_TYPE_INTEGER;
 104         argobj.Integer.Value = dock;
 105         args.Count = 1;
 106         args.Pointer = &argobj;
 107         buf.Pointer = &retobj;
 108         buf.Length = sizeof(retobj);
 109         status = AcpiEvaluateObject(h, "_DCK", &args, &buf);
 110
 111         /*
 112          * When _DCK is called with 0, OSPM will ignore the return value.
 113          */
 114         if (dock == ACPI_DOCK_ISOLATE)
 115                 return (0);
 116
 117         /* If _DCK returned 1, the request succeeded. */
 118         if (ACPI_SUCCESS(status) && retobj.Type == ACPI_TYPE_INTEGER &&
 119             retobj.Integer.Value == 1)
 120                 return (0);
 121
 122         return (-1);
 123 }
 124
 125 /* Lock devices while docked to prevent surprise removal. */
 126 static void
 127 acpi_dock_execute_lck(device_t dev, int lock)
 128 {
 129         ACPI_HANDLE     h;
 130
 131         h = acpi_get_handle(dev);
 132         acpi_SetInteger(h, "_LCK", lock);
 133 }
 134
 135 /* Eject a device (i.e., motorized). */
 136 static int
 137 acpi_dock_execute_ejx(device_t dev, int eject, int state)
 138 {
 139         ACPI_HANDLE     h;
 140         ACPI_STATUS     status;
 141         char            ejx[5];
 142
 143         h = acpi_get_handle(dev);
 144         snprintf(ejx, sizeof(ejx), "_EJ%d", state);
 145         status = acpi_SetInteger(h, ejx, eject);
 146         if (ACPI_SUCCESS(status))
 147                 return (0);
 148
 149         return (-1);
 150 }
 151
 152 /* Find dependent devices.  When their parent is removed, so are they. */
 153 static int
 154 acpi_dock_is_ejd_device(ACPI_HANDLE dock_handle, ACPI_HANDLE handle)
 155 {
 156         int             ret;
 157         ACPI_STATUS     ret_status;
 158         ACPI_BUFFER     ejd_buffer;
 159         ACPI_OBJECT     *obj;
 160
 161         ret = 0;
 162
 163         ejd_buffer.Pointer = NULL;
 164         ejd_buffer.Length = ACPI_ALLOCATE_BUFFER;
 165         ret_status = AcpiEvaluateObject(handle, "_EJD", NULL, &ejd_buffer);
 166         if (ACPI_FAILURE(ret_status))
 167                 goto out;
 168
 169         obj = (ACPI_OBJECT *)ejd_buffer.Pointer;
 170         if (dock_handle == acpi_GetReference(NULL, obj))
 171                 ret = 1;
 172
 173 out:
 174         if (ejd_buffer.Pointer != NULL)
 175                 AcpiOsFree(ejd_buffer.Pointer);
 176
 177         return (ret);
 178 }
 179
 180 /*
 181  * Docking functions
 182  */
 183
 184 static void
 185 acpi_dock_attach_later(void *context)
 186 {
 187         device_t        dev;
 188
 189         dev = (device_t)context;
 190
 191         if (!device_is_enabled(dev))
 192                 device_enable(dev);
 193
 194         mtx_lock(&Giant);
 195         device_probe_and_attach(dev);
 196         mtx_unlock(&Giant);
 197 }
 198
 199 static ACPI_STATUS
 200 acpi_dock_insert_child(ACPI_HANDLE handle, UINT32 level, void *context,
 201     void **status)
 202 {
 203         device_t        dock_dev, dev;
 204         ACPI_HANDLE     dock_handle;
 205
 206         dock_dev = (device_t)context;
 207         dock_handle = acpi_get_handle(dock_dev);
 208
 209         if (!acpi_dock_is_ejd_device(dock_handle, handle))
 210                 goto out;
 211
 212         ACPI_VPRINT(dock_dev, acpi_device_get_parent_softc(dock_dev),
 213                     "inserting device for %s\n", acpi_name(handle));
 214
 215 #if 0
 216         /*
 217          * If the system boot up w/o Docking, the devices under the dock
 218          * still un-initialized, also control methods such as _INI, _STA
 219          * are not executed.
 220          * Normal devices are initialized at booting by calling
 221          * AcpiInitializeObjects(), however the devices under the dock
 222          * need to be initialized here on the scheme of ACPICA.
 223          */
 224         ACPI_INIT_WALK_INFO     Info;
 225
 226         AcpiNsWalkNamespace(ACPI_TYPE_ANY, handle,
 227             100, TRUE, AcpiNsInitOneDevice, NULL, &Info, NULL);
 228 #endif
 229
 230         dev = acpi_get_device(handle);
 231         if (dev == NULL) {
 232                 device_printf(dock_dev, "error: %s has no associated device\n",
 233                     acpi_name(handle));
 234                 goto out;
 235         }
 236
 237         AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_dock_attach_later, dev);
 238
 239 out:
 240         return (AE_OK);
 241 }
 242
 243 static void
 244 acpi_dock_insert_children(device_t dev)
 245 {
 246         ACPI_STATUS     status;
 247         ACPI_HANDLE     sb_handle;
 248
 249         status = AcpiGetHandle(ACPI_ROOT_OBJECT, "\\_SB_", &sb_handle);
 250         if (ACPI_SUCCESS(status)) {
 251                 AcpiWalkNamespace(ACPI_TYPE_DEVICE, sb_handle,
 252                     100, acpi_dock_insert_child, NULL, dev, NULL);
 253         }
 254 }
 255
 256 static void
 257 acpi_dock_insert(device_t dev)
 258 {
 259         struct acpi_dock_softc *sc;
 260
 261         ACPI_SERIAL_ASSERT(dock);
 262
 263         sc = device_get_softc(dev);
 264
 265         if (sc->status == ACPI_DOCK_STATUS_UNDOCKED ||
 266             sc->status == ACPI_DOCK_STATUS_UNKNOWN) {
 267                 acpi_dock_execute_lck(dev, ACPI_DOCK_LOCK);
 268                 if (acpi_dock_execute_dck(dev, ACPI_DOCK_CONNECT) != 0) {
 269                         device_printf(dev, "_DCK failed\n");
 270                         return;
 271                 }
 272
 273                 if (!cold)
 274                         acpi_dock_insert_children(dev);
 275                 sc->status = ACPI_DOCK_STATUS_DOCKED;
 276         }
 277 }
 278
 279 /*
 280  * Undock
 281  */
 282
 283 static ACPI_STATUS
 284 acpi_dock_eject_child(ACPI_HANDLE handle, UINT32 level, void *context,
 285     void **status)
 286 {
 287         device_t        dock_dev, dev;
 288         ACPI_HANDLE     dock_handle;
 289
 290         dock_dev = *(device_t *)context;
 291         dock_handle = acpi_get_handle(dock_dev);
 292
 293         if (!acpi_dock_is_ejd_device(dock_handle, handle))
 294                 goto out;
 295
 296         ACPI_VPRINT(dock_dev, acpi_device_get_parent_softc(dock_dev),
 297             "ejecting device for %s\n", acpi_name(handle));
 298
 299         dev = acpi_get_device(handle);
 300         if (dev != NULL && device_is_attached(dev)) {
 301                 mtx_lock(&Giant);
 302                 device_detach(dev);
 303                 mtx_unlock(&Giant);
 304         }
 305
 306         acpi_SetInteger(handle, "_EJ0", 0);
 307 out:
 308         return (AE_OK);
 309 }
 310
 311 static void
 312 acpi_dock_eject_children(device_t dev)
 313 {
 314         ACPI_HANDLE     sb_handle;
 315         ACPI_STATUS     status;
 316
 317         status = AcpiGetHandle(ACPI_ROOT_OBJECT, "\\_SB_", &sb_handle);
 318         if (ACPI_SUCCESS(status)) {
 319                 AcpiWalkNamespace(ACPI_TYPE_DEVICE, sb_handle,
 320                     100, acpi_dock_eject_child, NULL, &dev, NULL);
 321         }
 322 }
 323
 324 static void
 325 acpi_dock_removal(device_t dev)
 326 {
 327         struct acpi_dock_softc *sc;
 328
 329         ACPI_SERIAL_ASSERT(dock);
 330
 331         sc = device_get_softc(dev);
 332         if (sc->status == ACPI_DOCK_STATUS_DOCKED ||
 333             sc->status == ACPI_DOCK_STATUS_UNKNOWN) {
 334                 acpi_dock_eject_children(dev);
 335                 if (acpi_dock_execute_dck(dev, ACPI_DOCK_ISOLATE) != 0)
 336                         return;
 337
 338                 acpi_dock_execute_lck(dev, ACPI_DOCK_UNLOCK);
 339
 340                 if (acpi_dock_execute_ejx(dev, 1, 0) != 0) {
 341                         device_printf(dev, "_EJ0 failed\n");
 342                         return;
 343                 }
 344
 345                 sc->status = ACPI_DOCK_STATUS_UNDOCKED;
 346         }
 347
 348         acpi_dock_get_info(dev);
 349         if (sc->_sta != 0)
 350                 device_printf(dev, "mechanical failure (%#x).\n", sc->_sta);
 351 }
 352
 353 /*
 354  * Device/Bus check
 355  */
 356
 357 static void
 358 acpi_dock_device_check(device_t dev)
 359 {
 360         struct acpi_dock_softc *sc;
 361
 362         ACPI_SERIAL_ASSERT(dock);
 363
 364         sc = device_get_softc(dev);
 365         acpi_dock_get_info(dev);
 366
 367         /*
 368          * If the _STA method indicates 'present' and 'functioning', the
 369          * system is docked.  If _STA does not exist for this device, it
 370          * is always present.
 371          */
 372         if (sc->_sta == ACPI_DOCK_STATUS_UNKNOWN ||
 373             ACPI_DEVICE_PRESENT(sc->_sta))
 374                 acpi_dock_insert(dev);
 375         else if (sc->_sta == 0)
 376                 acpi_dock_removal(dev);
 377 }
 378
 379 /*
 380  * Notify Handler
 381  */
 382
 383 static void
 384 acpi_dock_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
 385 {
 386         device_t        dev;
 387
 388         dev = (device_t) context;
 389         ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
 390                     "got notification %#x\n", notify);
 391
 392         ACPI_SERIAL_BEGIN(dock);
 393         switch (notify) {
 394         case ACPI_NOTIFY_BUS_CHECK:
 395         case ACPI_NOTIFY_DEVICE_CHECK:
 396                 acpi_dock_device_check(dev);
 397                 break;
 398         case ACPI_NOTIFY_EJECT_REQUEST:
 399                 acpi_dock_removal(dev);
 400                 break;
 401         default:
 402                 device_printf(dev, "unknown notify %#x\n", notify);
 403                 break;
 404         }
 405         ACPI_SERIAL_END(dock);
 406 }
 407
 408 static int
 409 acpi_dock_status_sysctl(SYSCTL_HANDLER_ARGS)
 410 {
 411         struct acpi_dock_softc *sc;
 412         device_t        dev;
 413         int             status, err;
 414
 415         dev = (device_t)arg1;
 416
 417         sc = device_get_softc(dev);
 418         status = sc->status;
 419
 420         ACPI_SERIAL_BEGIN(dock);
 421         err = sysctl_handle_int(oidp, &status, 0, req);
 422         if (err != 0 || req->newptr == NULL)
 423                 goto out;
 424
 425         if (status != ACPI_DOCK_STATUS_UNDOCKED &&
 426             status != ACPI_DOCK_STATUS_DOCKED) {
 427                 err = EINVAL;
 428                 goto out;
 429         }
 430
 431         if (status == sc->status)
 432                 goto out;
 433
 434         switch (status) {
 435         case ACPI_DOCK_STATUS_UNDOCKED:
 436                 acpi_dock_removal(dev);
 437                 break;
 438         case ACPI_DOCK_STATUS_DOCKED:
 439                 acpi_dock_device_check(dev);
 440                 break;
 441         default:
 442                 err = EINVAL;
 443                 break;
 444         }
 445 out:
 446         ACPI_SERIAL_END(dock);
 447         return (err);
 448 }
 449
 450 static int
 451 acpi_dock_probe(device_t dev)
 452 {
 453         ACPI_HANDLE     h, tmp;
 454
 455         h = acpi_get_handle(dev);
 456         if (acpi_disabled("dock") ||
 457             ACPI_FAILURE(AcpiGetHandle(h, "_DCK", &tmp)))
 458                 return (ENXIO);
 459
 460         device_set_desc(dev, "ACPI Docking Station");
 461
 462         /*
 463          * XXX Somewhere else in the kernel panics on "sysctl kern" if we
 464          * return a negative value here (reprobe ok).
 465          */
 466         return (0);
 467 }
 468
 469 static int
 470 acpi_dock_attach(device_t dev)
 471 {
 472         struct acpi_dock_softc *sc;
 473         ACPI_HANDLE     h;
 474
 475         sc = device_get_softc(dev);
 476         h = acpi_get_handle(dev);
 477         if (sc == NULL || h == NULL)
 478                 return (ENXIO);
 479
 480         sc->status = ACPI_DOCK_STATUS_UNKNOWN;
 481
 482         AcpiEvaluateObject(h, "_INI", NULL, NULL);
 483
 484         ACPI_SERIAL_BEGIN(dock);
 485
 486         acpi_dock_device_check(dev);
 487
 488         /* Get the sysctl tree */
 489         sc->sysctl_ctx = device_get_sysctl_ctx(dev);
 490         sc->sysctl_tree = device_get_sysctl_tree(dev);
 491
 492         SYSCTL_ADD_INT(sc->sysctl_ctx,
 493                 SYSCTL_CHILDREN(sc->sysctl_tree),
 494                 OID_AUTO, "_sta", CTLFLAG_RD,
 495                 &sc->_sta, 0, "Dock _STA");
 496         SYSCTL_ADD_INT(sc->sysctl_ctx,
 497                 SYSCTL_CHILDREN(sc->sysctl_tree),
 498                 OID_AUTO, "_bdn", CTLFLAG_RD,
 499                 &sc->_bdn, 0, "Dock _BDN");
 500         SYSCTL_ADD_INT(sc->sysctl_ctx,
 501                 SYSCTL_CHILDREN(sc->sysctl_tree),
 502                 OID_AUTO, "_uid", CTLFLAG_RD,
 503                 &sc->_uid, 0, "Dock _UID");
 504         SYSCTL_ADD_PROC(sc->sysctl_ctx,
 505                 SYSCTL_CHILDREN(sc->sysctl_tree),
 506                 OID_AUTO, "status",
 507                 CTLTYPE_INT|CTLFLAG_RW, dev, 0,
 508                 acpi_dock_status_sysctl, "I",
 509                 "Dock/Undock operation");
 510
 511         ACPI_SERIAL_END(dock);
 512
 513         AcpiInstallNotifyHandler(h, ACPI_ALL_NOTIFY,
 514                                  acpi_dock_notify_handler, dev);
 515
 516         return (0);
 517 }
 518
 519 static device_method_t acpi_dock_methods[] = {
 520         /* Device interface */
 521         DEVMETHOD(device_probe, acpi_dock_probe),
 522         DEVMETHOD(device_attach, acpi_dock_attach),
 523
 524         DEVMETHOD_END
 525 };
 526
 527 static driver_t acpi_dock_driver = {
 528         "acpi_dock",
 529         acpi_dock_methods,
 530         sizeof(struct acpi_dock_softc),
 531 };
 532
 533 static devclass_t acpi_dock_devclass;
 534
 535 DRIVER_MODULE(acpi_dock, acpi, acpi_dock_driver, acpi_dock_devclass, 0, 0);
 536 MODULE_DEPEND(acpi_dock, acpi, 1, 1, 1);
 537