drivers/acpi/scan.c

   1 /*
   2  * scan.c - support for transforming the ACPI namespace into individual objects
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/init.h>
   7 #include <linux/slab.h>
   8 #include <linux/kernel.h>
   9 #include <linux/acpi.h>
  10 #include <linux/signal.h>
  11 #include <linux/kthread.h>
  12 #include <linux/dmi.h>
  13 #include <linux/nls.h>
  14
  15 #include <acpi/acpi_drivers.h>
  16
  17 #include "internal.h"
  18
  19 #define _COMPONENT              ACPI_BUS_COMPONENT
  20 ACPI_MODULE_NAME("scan");
  21 #define STRUCT_TO_INT(s)        (*((int*)&s))
  22 extern struct acpi_device *acpi_root;
  23
  24 #define ACPI_BUS_CLASS                  "system_bus"
  25 #define ACPI_BUS_HID                    "LNXSYBUS"
  26 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  27
  28 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  29
  30 static const char *dummy_hid = "device";
  31
  32 static LIST_HEAD(acpi_device_list);
  33 static LIST_HEAD(acpi_bus_id_list);
  34 static DEFINE_MUTEX(acpi_scan_lock);
  35 static LIST_HEAD(acpi_scan_handlers_list);
  36 DEFINE_MUTEX(acpi_device_lock);
  37 LIST_HEAD(acpi_wakeup_device_list);
  38
  39 struct acpi_device_bus_id{
  40         char bus_id[15];
  41         unsigned int instance_no;
  42         struct list_head node;
  43 };
  44
  45 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  46 {
  47         if (!handler || !handler->attach)
  48                 return -EINVAL;
  49
  50         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
  51         return 0;
  52 }
  53
  54 /*
  55  * Creates hid/cid(s) string needed for modalias and uevent
  56  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  57  * char *modalias: "acpi:IBM0001:ACPI0001"
  58 */
  59 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  60                            int size)
  61 {
  62         int len;
  63         int count;
  64         struct acpi_hardware_id *id;
  65
  66         if (list_empty(&acpi_dev->pnp.ids))
  67                 return 0;
  68
  69         len = snprintf(modalias, size, "acpi:");
  70         size -= len;
  71
  72         list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
  73                 count = snprintf(&modalias[len], size, "%s:", id->id);
  74                 if (count < 0 || count >= size)
  75                         return -EINVAL;
  76                 len += count;
  77                 size -= count;
  78         }
  79
  80         modalias[len] = '\0';
  81         return len;
  82 }
  83
  84 static ssize_t
  85 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  86         struct acpi_device *acpi_dev = to_acpi_device(dev);
  87         int len;
  88
  89         /* Device has no HID and no CID or string is >1024 */
  90         len = create_modalias(acpi_dev, buf, 1024);
  91         if (len <= 0)
  92                 return 0;
  93         buf[len++] = '\n';
  94         return len;
  95 }
  96 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  97
  98 /**
  99  * acpi_bus_hot_remove_device: hot-remove a device and its children
 100  * @context: struct acpi_eject_event pointer (freed in this func)
 101  *
 102  * Hot-remove a device and its children. This function frees up the
 103  * memory space passed by arg context, so that the caller may call
 104  * this function asynchronously through acpi_os_hotplug_execute().
 105  */
 106 void acpi_bus_hot_remove_device(void *context)
 107 {
 108         struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
 109         struct acpi_device *device = ej_event->device;
 110         acpi_handle handle = device->handle;
 111         acpi_handle temp;
 112         struct acpi_object_list arg_list;
 113         union acpi_object arg;
 114         acpi_status status = AE_OK;
 115         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
 116
 117         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 118                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 119
 120         acpi_bus_trim(device);
 121         /* Device node has been released. */
 122         device = NULL;
 123
 124         /* power off device */
 125         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 126         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 127                 printk(KERN_WARNING PREFIX
 128                                 "Power-off device failed\n");
 129
 130         if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
 131                 arg_list.count = 1;
 132                 arg_list.pointer = &arg;
 133                 arg.type = ACPI_TYPE_INTEGER;
 134                 arg.integer.value = 0;
 135                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 136         }
 137
 138         arg_list.count = 1;
 139         arg_list.pointer = &arg;
 140         arg.type = ACPI_TYPE_INTEGER;
 141         arg.integer.value = 1;
 142
 143         /*
 144          * TBD: _EJD support.
 145          */
 146         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 147         if (ACPI_FAILURE(status)) {
 148                 if (status != AE_NOT_FOUND)
 149                         printk(KERN_WARNING PREFIX
 150                                         "Eject device failed\n");
 151                 goto err_out;
 152         }
 153
 154         kfree(context);
 155         return;
 156
 157 err_out:
 158         /* Inform firmware the hot-remove operation has completed w/ error */
 159         (void) acpi_evaluate_hotplug_ost(handle,
 160                                 ej_event->event, ost_code, NULL);
 161         kfree(context);
 162         return;
 163 }
 164 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
 165
 166 static ssize_t real_power_state_show(struct device *dev,
 167                                      struct device_attribute *attr, char *buf)
 168 {
 169         struct acpi_device *adev = to_acpi_device(dev);
 170         int state;
 171         int ret;
 172
 173         ret = acpi_device_get_power(adev, &state);
 174         if (ret)
 175                 return ret;
 176
 177         return sprintf(buf, "%s\n", acpi_power_state_string(state));
 178 }
 179
 180 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
 181
 182 static ssize_t power_state_show(struct device *dev,
 183                                 struct device_attribute *attr, char *buf)
 184 {
 185         struct acpi_device *adev = to_acpi_device(dev);
 186
 187         return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
 188 }
 189
 190 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
 191
 192 static ssize_t
 193 acpi_eject_store(struct device *d, struct device_attribute *attr,
 194                 const char *buf, size_t count)
 195 {
 196         int ret = count;
 197         acpi_status status;
 198         acpi_object_type type = 0;
 199         struct acpi_device *acpi_device = to_acpi_device(d);
 200         struct acpi_eject_event *ej_event;
 201
 202         if ((!count) || (buf[0] != '1')) {
 203                 return -EINVAL;
 204         }
 205 #ifndef FORCE_EJECT
 206         if (acpi_device->driver == NULL) {
 207                 ret = -ENODEV;
 208                 goto err;
 209         }
 210 #endif
 211         status = acpi_get_type(acpi_device->handle, &type);
 212         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 213                 ret = -ENODEV;
 214                 goto err;
 215         }
 216
 217         ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
 218         if (!ej_event) {
 219                 ret = -ENOMEM;
 220                 goto err;
 221         }
 222
 223         ej_event->device = acpi_device;
 224         if (acpi_device->flags.eject_pending) {
 225                 /* event originated from ACPI eject notification */
 226                 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
 227                 acpi_device->flags.eject_pending = 0;
 228         } else {
 229                 /* event originated from user */
 230                 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
 231                 (void) acpi_evaluate_hotplug_ost(acpi_device->handle,
 232                         ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 233         }
 234
 235         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
 236 err:
 237         return ret;
 238 }
 239
 240 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 241
 242 static ssize_t
 243 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 244         struct acpi_device *acpi_dev = to_acpi_device(dev);
 245
 246         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 247 }
 248 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 249
 250 static ssize_t acpi_device_uid_show(struct device *dev,
 251                                     struct device_attribute *attr, char *buf)
 252 {
 253         struct acpi_device *acpi_dev = to_acpi_device(dev);
 254
 255         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 256 }
 257 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 258
 259 static ssize_t acpi_device_adr_show(struct device *dev,
 260                                     struct device_attribute *attr, char *buf)
 261 {
 262         struct acpi_device *acpi_dev = to_acpi_device(dev);
 263
 264         return sprintf(buf, "0x%08x\n",
 265                        (unsigned int)(acpi_dev->pnp.bus_address));
 266 }
 267 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 268
 269 static ssize_t
 270 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 271         struct acpi_device *acpi_dev = to_acpi_device(dev);
 272         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 273         int result;
 274
 275         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 276         if (result)
 277                 goto end;
 278
 279         result = sprintf(buf, "%s\n", (char*)path.pointer);
 280         kfree(path.pointer);
 281 end:
 282         return result;
 283 }
 284 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 285
 286 /* sysfs file that shows description text from the ACPI _STR method */
 287 static ssize_t description_show(struct device *dev,
 288                                 struct device_attribute *attr,
 289                                 char *buf) {
 290         struct acpi_device *acpi_dev = to_acpi_device(dev);
 291         int result;
 292
 293         if (acpi_dev->pnp.str_obj == NULL)
 294                 return 0;
 295
 296         /*
 297          * The _STR object contains a Unicode identifier for a device.
 298          * We need to convert to utf-8 so it can be displayed.
 299          */
 300         result = utf16s_to_utf8s(
 301                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 302                 acpi_dev->pnp.str_obj->buffer.length,
 303                 UTF16_LITTLE_ENDIAN, buf,
 304                 PAGE_SIZE);
 305
 306         buf[result++] = '\n';
 307
 308         return result;
 309 }
 310 static DEVICE_ATTR(description, 0444, description_show, NULL);
 311
 312 static ssize_t
 313 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 314                      char *buf) {
 315         struct acpi_device *acpi_dev = to_acpi_device(dev);
 316
 317         return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 318 }
 319 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 320
 321 static int acpi_device_setup_files(struct acpi_device *dev)
 322 {
 323         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 324         acpi_status status;
 325         acpi_handle temp;
 326         unsigned long long sun;
 327         int result = 0;
 328
 329         /*
 330          * Devices gotten from FADT don't have a "path" attribute
 331          */
 332         if (dev->handle) {
 333                 result = device_create_file(&dev->dev, &dev_attr_path);
 334                 if (result)
 335                         goto end;
 336         }
 337
 338         if (!list_empty(&dev->pnp.ids)) {
 339                 result = device_create_file(&dev->dev, &dev_attr_hid);
 340                 if (result)
 341                         goto end;
 342
 343                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 344                 if (result)
 345                         goto end;
 346         }
 347
 348         /*
 349          * If device has _STR, 'description' file is created
 350          */
 351         status = acpi_get_handle(dev->handle, "_STR", &temp);
 352         if (ACPI_SUCCESS(status)) {
 353                 status = acpi_evaluate_object(dev->handle, "_STR",
 354                                         NULL, &buffer);
 355                 if (ACPI_FAILURE(status))
 356                         buffer.pointer = NULL;
 357                 dev->pnp.str_obj = buffer.pointer;
 358                 result = device_create_file(&dev->dev, &dev_attr_description);
 359                 if (result)
 360                         goto end;
 361         }
 362
 363         if (dev->flags.bus_address)
 364                 result = device_create_file(&dev->dev, &dev_attr_adr);
 365         if (dev->pnp.unique_id)
 366                 result = device_create_file(&dev->dev, &dev_attr_uid);
 367
 368         status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 369         if (ACPI_SUCCESS(status)) {
 370                 dev->pnp.sun = (unsigned long)sun;
 371                 result = device_create_file(&dev->dev, &dev_attr_sun);
 372                 if (result)
 373                         goto end;
 374         } else {
 375                 dev->pnp.sun = (unsigned long)-1;
 376         }
 377
 378         /*
 379          * If device has _EJ0, 'eject' file is created that is used to trigger
 380          * hot-removal function from userland.
 381          */
 382         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 383         if (ACPI_SUCCESS(status)) {
 384                 result = device_create_file(&dev->dev, &dev_attr_eject);
 385                 if (result)
 386                         return result;
 387         }
 388
 389         if (dev->flags.power_manageable) {
 390                 result = device_create_file(&dev->dev, &dev_attr_power_state);
 391                 if (result)
 392                         return result;
 393
 394                 if (dev->power.flags.power_resources)
 395                         result = device_create_file(&dev->dev,
 396                                                     &dev_attr_real_power_state);
 397         }
 398
 399 end:
 400         return result;
 401 }
 402
 403 static void acpi_device_remove_files(struct acpi_device *dev)
 404 {
 405         acpi_status status;
 406         acpi_handle temp;
 407
 408         if (dev->flags.power_manageable) {
 409                 device_remove_file(&dev->dev, &dev_attr_power_state);
 410                 if (dev->power.flags.power_resources)
 411                         device_remove_file(&dev->dev,
 412                                            &dev_attr_real_power_state);
 413         }
 414
 415         /*
 416          * If device has _STR, remove 'description' file
 417          */
 418         status = acpi_get_handle(dev->handle, "_STR", &temp);
 419         if (ACPI_SUCCESS(status)) {
 420                 kfree(dev->pnp.str_obj);
 421                 device_remove_file(&dev->dev, &dev_attr_description);
 422         }
 423         /*
 424          * If device has _EJ0, remove 'eject' file.
 425          */
 426         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 427         if (ACPI_SUCCESS(status))
 428                 device_remove_file(&dev->dev, &dev_attr_eject);
 429
 430         status = acpi_get_handle(dev->handle, "_SUN", &temp);
 431         if (ACPI_SUCCESS(status))
 432                 device_remove_file(&dev->dev, &dev_attr_sun);
 433
 434         if (dev->pnp.unique_id)
 435                 device_remove_file(&dev->dev, &dev_attr_uid);
 436         if (dev->flags.bus_address)
 437                 device_remove_file(&dev->dev, &dev_attr_adr);
 438         device_remove_file(&dev->dev, &dev_attr_modalias);
 439         device_remove_file(&dev->dev, &dev_attr_hid);
 440         if (dev->handle)
 441                 device_remove_file(&dev->dev, &dev_attr_path);
 442 }
 443 /* --------------------------------------------------------------------------
 444                         ACPI Bus operations
 445    -------------------------------------------------------------------------- */
 446
 447 static const struct acpi_device_id *__acpi_match_device(
 448         struct acpi_device *device, const struct acpi_device_id *ids)
 449 {
 450         const struct acpi_device_id *id;
 451         struct acpi_hardware_id *hwid;
 452
 453         /*
 454          * If the device is not present, it is unnecessary to load device
 455          * driver for it.
 456          */
 457         if (!device->status.present)
 458                 return NULL;
 459
 460         for (id = ids; id->id[0]; id++)
 461                 list_for_each_entry(hwid, &device->pnp.ids, list)
 462                         if (!strcmp((char *) id->id, hwid->id))
 463                                 return id;
 464
 465         return NULL;
 466 }
 467
 468 /**
 469  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 470  * @ids: Array of struct acpi_device_id object to match against.
 471  * @dev: The device structure to match.
 472  *
 473  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 474  * object for that handle and use that object to match against a given list of
 475  * device IDs.
 476  *
 477  * Return a pointer to the first matching ID on success or %NULL on failure.
 478  */
 479 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 480                                                const struct device *dev)
 481 {
 482         struct acpi_device *adev;
 483
 484         if (!ids || !ACPI_HANDLE(dev)
 485             || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
 486                 return NULL;
 487
 488         return __acpi_match_device(adev, ids);
 489 }
 490 EXPORT_SYMBOL_GPL(acpi_match_device);
 491
 492 int acpi_match_device_ids(struct acpi_device *device,
 493                           const struct acpi_device_id *ids)
 494 {
 495         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 496 }
 497 EXPORT_SYMBOL(acpi_match_device_ids);
 498
 499 void acpi_free_ids(struct acpi_device *device)
 500 {
 501         struct acpi_hardware_id *id, *tmp;
 502
 503         list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
 504                 kfree(id->id);
 505                 kfree(id);
 506         }
 507         kfree(device->pnp.unique_id);
 508 }
 509
 510 static void acpi_free_power_resources_lists(struct acpi_device *device)
 511 {
 512         int i;
 513
 514         if (device->wakeup.flags.valid)
 515                 acpi_power_resources_list_free(&device->wakeup.resources);
 516
 517         if (!device->flags.power_manageable)
 518                 return;
 519
 520         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 521                 struct acpi_device_power_state *ps = &device->power.states[i];
 522                 acpi_power_resources_list_free(&ps->resources);
 523         }
 524 }
 525
 526 static void acpi_device_release(struct device *dev)
 527 {
 528         struct acpi_device *acpi_dev = to_acpi_device(dev);
 529
 530         acpi_free_ids(acpi_dev);
 531         acpi_free_power_resources_lists(acpi_dev);
 532         kfree(acpi_dev);
 533 }
 534
 535 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 536 {
 537         struct acpi_device *acpi_dev = to_acpi_device(dev);
 538         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 539
 540         return acpi_dev->flags.match_driver
 541                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 542 }
 543
 544 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 545 {
 546         struct acpi_device *acpi_dev = to_acpi_device(dev);
 547         int len;
 548
 549         if (list_empty(&acpi_dev->pnp.ids))
 550                 return 0;
 551
 552         if (add_uevent_var(env, "MODALIAS="))
 553                 return -ENOMEM;
 554         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 555                               sizeof(env->buf) - env->buflen);
 556         if (len >= (sizeof(env->buf) - env->buflen))
 557                 return -ENOMEM;
 558         env->buflen += len;
 559         return 0;
 560 }
 561
 562 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 563 {
 564         struct acpi_device *device = data;
 565
 566         device->driver->ops.notify(device, event);
 567 }
 568
 569 static acpi_status acpi_device_notify_fixed(void *data)
 570 {
 571         struct acpi_device *device = data;
 572
 573         /* Fixed hardware devices have no handles */
 574         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 575         return AE_OK;
 576 }
 577
 578 static int acpi_device_install_notify_handler(struct acpi_device *device)
 579 {
 580         acpi_status status;
 581
 582         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 583                 status =
 584                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 585                                                      acpi_device_notify_fixed,
 586                                                      device);
 587         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 588                 status =
 589                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 590                                                      acpi_device_notify_fixed,
 591                                                      device);
 592         else
 593                 status = acpi_install_notify_handler(device->handle,
 594                                                      ACPI_DEVICE_NOTIFY,
 595                                                      acpi_device_notify,
 596                                                      device);
 597
 598         if (ACPI_FAILURE(status))
 599                 return -EINVAL;
 600         return 0;
 601 }
 602
 603 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 604 {
 605         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 606                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 607                                                 acpi_device_notify_fixed);
 608         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 609                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 610                                                 acpi_device_notify_fixed);
 611         else
 612                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 613                                            acpi_device_notify);
 614 }
 615
 616 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 617 static int acpi_device_probe(struct device * dev)
 618 {
 619         struct acpi_device *acpi_dev = to_acpi_device(dev);
 620         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 621         int ret;
 622
 623         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 624         if (!ret) {
 625                 if (acpi_drv->ops.notify) {
 626                         ret = acpi_device_install_notify_handler(acpi_dev);
 627                         if (ret) {
 628                                 if (acpi_drv->ops.remove)
 629                                         acpi_drv->ops.remove(acpi_dev);
 630                                 return ret;
 631                         }
 632                 }
 633
 634                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 635                         "Found driver [%s] for device [%s]\n",
 636                         acpi_drv->name, acpi_dev->pnp.bus_id));
 637                 get_device(dev);
 638         }
 639         return ret;
 640 }
 641
 642 static int acpi_device_remove(struct device * dev)
 643 {
 644         struct acpi_device *acpi_dev = to_acpi_device(dev);
 645         struct acpi_driver *acpi_drv = acpi_dev->driver;
 646
 647         if (acpi_drv) {
 648                 if (acpi_drv->ops.notify)
 649                         acpi_device_remove_notify_handler(acpi_dev);
 650                 if (acpi_drv->ops.remove)
 651                         acpi_drv->ops.remove(acpi_dev);
 652         }
 653         acpi_dev->driver = NULL;
 654         acpi_dev->driver_data = NULL;
 655
 656         put_device(dev);
 657         return 0;
 658 }
 659
 660 struct bus_type acpi_bus_type = {
 661         .name           = "acpi",
 662         .match          = acpi_bus_match,
 663         .probe          = acpi_device_probe,
 664         .remove         = acpi_device_remove,
 665         .uevent         = acpi_device_uevent,
 666 };
 667
 668 int acpi_device_add(struct acpi_device *device,
 669                     void (*release)(struct device *))
 670 {
 671         int result;
 672         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 673         int found = 0;
 674
 675         if (device->handle) {
 676                 acpi_status status;
 677
 678                 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
 679                                           device);
 680                 if (ACPI_FAILURE(status)) {
 681                         acpi_handle_err(device->handle,
 682                                         "Unable to attach device data\n");
 683                         return -ENODEV;
 684                 }
 685         }
 686
 687         /*
 688          * Linkage
 689          * -------
 690          * Link this device to its parent and siblings.
 691          */
 692         INIT_LIST_HEAD(&device->children);
 693         INIT_LIST_HEAD(&device->node);
 694         INIT_LIST_HEAD(&device->wakeup_list);
 695         INIT_LIST_HEAD(&device->physical_node_list);
 696         mutex_init(&device->physical_node_lock);
 697         INIT_LIST_HEAD(&device->power_dependent);
 698
 699         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 700         if (!new_bus_id) {
 701                 pr_err(PREFIX "Memory allocation error\n");
 702                 result = -ENOMEM;
 703                 goto err_detach;
 704         }
 705
 706         mutex_lock(&acpi_device_lock);
 707         /*
 708          * Find suitable bus_id and instance number in acpi_bus_id_list
 709          * If failed, create one and link it into acpi_bus_id_list
 710          */
 711         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 712                 if (!strcmp(acpi_device_bus_id->bus_id,
 713                             acpi_device_hid(device))) {
 714                         acpi_device_bus_id->instance_no++;
 715                         found = 1;
 716                         kfree(new_bus_id);
 717                         break;
 718                 }
 719         }
 720         if (!found) {
 721                 acpi_device_bus_id = new_bus_id;
 722                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 723                 acpi_device_bus_id->instance_no = 0;
 724                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 725         }
 726         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 727
 728         if (device->parent)
 729                 list_add_tail(&device->node, &device->parent->children);
 730
 731         if (device->wakeup.flags.valid)
 732                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 733         mutex_unlock(&acpi_device_lock);
 734
 735         if (device->parent)
 736                 device->dev.parent = &device->parent->dev;
 737         device->dev.bus = &acpi_bus_type;
 738         device->dev.release = release;
 739         result = device_add(&device->dev);
 740         if (result) {
 741                 dev_err(&device->dev, "Error registering device\n");
 742                 goto err;
 743         }
 744
 745         result = acpi_device_setup_files(device);
 746         if (result)
 747                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 748                        dev_name(&device->dev));
 749
 750         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 751         return 0;
 752
 753  err:
 754         mutex_lock(&acpi_device_lock);
 755         if (device->parent)
 756                 list_del(&device->node);
 757         list_del(&device->wakeup_list);
 758         mutex_unlock(&acpi_device_lock);
 759
 760  err_detach:
 761         acpi_detach_data(device->handle, acpi_bus_data_handler);
 762         return result;
 763 }
 764
 765 static void acpi_device_unregister(struct acpi_device *device)
 766 {
 767         mutex_lock(&acpi_device_lock);
 768         if (device->parent)
 769                 list_del(&device->node);
 770
 771         list_del(&device->wakeup_list);
 772         mutex_unlock(&acpi_device_lock);
 773
 774         acpi_detach_data(device->handle, acpi_bus_data_handler);
 775
 776         acpi_power_add_remove_device(device, false);
 777         acpi_device_remove_files(device);
 778         if (device->remove)
 779                 device->remove(device);
 780
 781         device_del(&device->dev);
 782         /*
 783          * Drop the reference counts of all power resources the device depends
 784          * on and turn off the ones that have no more references.
 785          */
 786         acpi_power_transition(device, ACPI_STATE_D3_COLD);
 787         put_device(&device->dev);
 788 }
 789
 790 /* --------------------------------------------------------------------------
 791                                  Driver Management
 792    -------------------------------------------------------------------------- */
 793 /**
 794  * acpi_bus_driver_init - add a device to a driver
 795  * @device: the device to add and initialize
 796  * @driver: driver for the device
 797  *
 798  * Used to initialize a device via its device driver.  Called whenever a
 799  * driver is bound to a device.  Invokes the driver's add() ops.
 800  */
 801 static int
 802 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 803 {
 804         int result = 0;
 805
 806         if (!device || !driver)
 807                 return -EINVAL;
 808
 809         if (!driver->ops.add)
 810                 return -ENOSYS;
 811
 812         result = driver->ops.add(device);
 813         if (result) {
 814                 device->driver = NULL;
 815                 device->driver_data = NULL;
 816                 return result;
 817         }
 818
 819         device->driver = driver;
 820
 821         /*
 822          * TBD - Configuration Management: Assign resources to device based
 823          * upon possible configuration and currently allocated resources.
 824          */
 825
 826         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 827                           "Driver successfully bound to device\n"));
 828         return 0;
 829 }
 830
 831 /**
 832  * acpi_bus_register_driver - register a driver with the ACPI bus
 833  * @driver: driver being registered
 834  *
 835  * Registers a driver with the ACPI bus.  Searches the namespace for all
 836  * devices that match the driver's criteria and binds.  Returns zero for
 837  * success or a negative error status for failure.
 838  */
 839 int acpi_bus_register_driver(struct acpi_driver *driver)
 840 {
 841         int ret;
 842
 843         if (acpi_disabled)
 844                 return -ENODEV;
 845         driver->drv.name = driver->name;
 846         driver->drv.bus = &acpi_bus_type;
 847         driver->drv.owner = driver->owner;
 848
 849         ret = driver_register(&driver->drv);
 850         return ret;
 851 }
 852
 853 EXPORT_SYMBOL(acpi_bus_register_driver);
 854
 855 /**
 856  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 857  * @driver: driver to unregister
 858  *
 859  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 860  * devices that match the driver's criteria and unbinds.
 861  */
 862 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 863 {
 864         driver_unregister(&driver->drv);
 865 }
 866
 867 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 868
 869 /* --------------------------------------------------------------------------
 870                                  Device Enumeration
 871    -------------------------------------------------------------------------- */
 872 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 873 {
 874         struct acpi_device *device = NULL;
 875         acpi_status status;
 876
 877         /*
 878          * Fixed hardware devices do not appear in the namespace and do not
 879          * have handles, but we fabricate acpi_devices for them, so we have
 880          * to deal with them specially.
 881          */
 882         if (!handle)
 883                 return acpi_root;
 884
 885         do {
 886                 status = acpi_get_parent(handle, &handle);
 887                 if (ACPI_FAILURE(status))
 888                         return status == AE_NULL_ENTRY ? NULL : acpi_root;
 889         } while (acpi_bus_get_device(handle, &device));
 890         return device;
 891 }
 892
 893 acpi_status
 894 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 895 {
 896         acpi_status status;
 897         acpi_handle tmp;
 898         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 899         union acpi_object *obj;
 900
 901         status = acpi_get_handle(handle, "_EJD", &tmp);
 902         if (ACPI_FAILURE(status))
 903                 return status;
 904
 905         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 906         if (ACPI_SUCCESS(status)) {
 907                 obj = buffer.pointer;
 908                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 909                                          ejd);
 910                 kfree(buffer.pointer);
 911         }
 912         return status;
 913 }
 914 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 915
 916 void acpi_bus_data_handler(acpi_handle handle, void *context)
 917 {
 918
 919         /* TBD */
 920
 921         return;
 922 }
 923
 924 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 925                                         struct acpi_device_wakeup *wakeup)
 926 {
 927         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 928         union acpi_object *package = NULL;
 929         union acpi_object *element = NULL;
 930         acpi_status status;
 931         int err = -ENODATA;
 932
 933         if (!wakeup)
 934                 return -EINVAL;
 935
 936         INIT_LIST_HEAD(&wakeup->resources);
 937
 938         /* _PRW */
 939         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 940         if (ACPI_FAILURE(status)) {
 941                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 942                 return err;
 943         }
 944
 945         package = (union acpi_object *)buffer.pointer;
 946
 947         if (!package || package->package.count < 2)
 948                 goto out;
 949
 950         element = &(package->package.elements[0]);
 951         if (!element)
 952                 goto out;
 953
 954         if (element->type == ACPI_TYPE_PACKAGE) {
 955                 if ((element->package.count < 2) ||
 956                     (element->package.elements[0].type !=
 957                      ACPI_TYPE_LOCAL_REFERENCE)
 958                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 959                         goto out;
 960
 961                 wakeup->gpe_device =
 962                     element->package.elements[0].reference.handle;
 963                 wakeup->gpe_number =
 964                     (u32) element->package.elements[1].integer.value;
 965         } else if (element->type == ACPI_TYPE_INTEGER) {
 966                 wakeup->gpe_device = NULL;
 967                 wakeup->gpe_number = element->integer.value;
 968         } else {
 969                 goto out;
 970         }
 971
 972         element = &(package->package.elements[1]);
 973         if (element->type != ACPI_TYPE_INTEGER)
 974                 goto out;
 975
 976         wakeup->sleep_state = element->integer.value;
 977
 978         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
 979         if (err)
 980                 goto out;
 981
 982         if (!list_empty(&wakeup->resources)) {
 983                 int sleep_state;
 984
 985                 sleep_state = acpi_power_min_system_level(&wakeup->resources);
 986                 if (sleep_state < wakeup->sleep_state) {
 987                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
 988                                          "(S%d) by S%d from power resources\n",
 989                                          (int)wakeup->sleep_state, sleep_state);
 990                         wakeup->sleep_state = sleep_state;
 991                 }
 992         }
 993         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
 994
 995  out:
 996         kfree(buffer.pointer);
 997         return err;
 998 }
 999
1000 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1001 {
1002         struct acpi_device_id button_device_ids[] = {
1003                 {"PNP0C0C", 0},
1004                 {"PNP0C0D", 0},
1005                 {"PNP0C0E", 0},
1006                 {"", 0},
1007         };
1008         acpi_status status;
1009         acpi_event_status event_status;
1010
1011         device->wakeup.flags.notifier_present = 0;
1012
1013         /* Power button, Lid switch always enable wakeup */
1014         if (!acpi_match_device_ids(device, button_device_ids)) {
1015                 device->wakeup.flags.run_wake = 1;
1016                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1017                         /* Do not use Lid/sleep button for S5 wakeup */
1018                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
1019                                 device->wakeup.sleep_state = ACPI_STATE_S4;
1020                 }
1021                 device_set_wakeup_capable(&device->dev, true);
1022                 return;
1023         }
1024
1025         status = acpi_get_gpe_status(device->wakeup.gpe_device,
1026                                         device->wakeup.gpe_number,
1027                                                 &event_status);
1028         if (status == AE_OK)
1029                 device->wakeup.flags.run_wake =
1030                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1031 }
1032
1033 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1034 {
1035         acpi_handle temp;
1036         acpi_status status = 0;
1037         int err;
1038
1039         /* Presence of _PRW indicates wake capable */
1040         status = acpi_get_handle(device->handle, "_PRW", &temp);
1041         if (ACPI_FAILURE(status))
1042                 return;
1043
1044         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1045                                                            &device->wakeup);
1046         if (err) {
1047                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1048                 return;
1049         }
1050
1051         device->wakeup.flags.valid = 1;
1052         device->wakeup.prepare_count = 0;
1053         acpi_bus_set_run_wake_flags(device);
1054         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1055          * system for the ACPI device with the _PRW object.
1056          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1057          * So it is necessary to call _DSW object first. Only when it is not
1058          * present will the _PSW object used.
1059          */
1060         err = acpi_device_sleep_wake(device, 0, 0, 0);
1061         if (err)
1062                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1063                                 "error in _DSW or _PSW evaluation\n"));
1064 }
1065
1066 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1067 {
1068         struct acpi_device_power_state *ps = &device->power.states[state];
1069         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1070         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1071         acpi_handle handle;
1072         acpi_status status;
1073
1074         INIT_LIST_HEAD(&ps->resources);
1075
1076         /* Evaluate "_PRx" to get referenced power resources */
1077         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1078         if (ACPI_SUCCESS(status)) {
1079                 union acpi_object *package = buffer.pointer;
1080
1081                 if (buffer.length && package
1082                     && package->type == ACPI_TYPE_PACKAGE
1083                     && package->package.count) {
1084                         int err = acpi_extract_power_resources(package, 0,
1085                                                                &ps->resources);
1086                         if (!err)
1087                                 device->power.flags.power_resources = 1;
1088                 }
1089                 ACPI_FREE(buffer.pointer);
1090         }
1091
1092         /* Evaluate "_PSx" to see if we can do explicit sets */
1093         pathname[2] = 'S';
1094         status = acpi_get_handle(device->handle, pathname, &handle);
1095         if (ACPI_SUCCESS(status))
1096                 ps->flags.explicit_set = 1;
1097
1098         /*
1099          * State is valid if there are means to put the device into it.
1100          * D3hot is only valid if _PR3 present.
1101          */
1102         if (!list_empty(&ps->resources)
1103             || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1104                 ps->flags.valid = 1;
1105                 ps->flags.os_accessible = 1;
1106         }
1107
1108         ps->power = -1;         /* Unknown - driver assigned */
1109         ps->latency = -1;       /* Unknown - driver assigned */
1110 }
1111
1112 static void acpi_bus_get_power_flags(struct acpi_device *device)
1113 {
1114         acpi_status status;
1115         acpi_handle handle;
1116         u32 i;
1117
1118         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1119         status = acpi_get_handle(device->handle, "_PS0", &handle);
1120         if (ACPI_FAILURE(status)) {
1121                 status = acpi_get_handle(device->handle, "_PR0", &handle);
1122                 if (ACPI_FAILURE(status))
1123                         return;
1124         }
1125
1126         device->flags.power_manageable = 1;
1127
1128         /*
1129          * Power Management Flags
1130          */
1131         status = acpi_get_handle(device->handle, "_PSC", &handle);
1132         if (ACPI_SUCCESS(status))
1133                 device->power.flags.explicit_get = 1;
1134         status = acpi_get_handle(device->handle, "_IRC", &handle);
1135         if (ACPI_SUCCESS(status))
1136                 device->power.flags.inrush_current = 1;
1137
1138         /*
1139          * Enumerate supported power management states
1140          */
1141         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1142                 acpi_bus_init_power_state(device, i);
1143
1144         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1145
1146         /* Set defaults for D0 and D3 states (always valid) */
1147         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1148         device->power.states[ACPI_STATE_D0].power = 100;
1149         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1150         device->power.states[ACPI_STATE_D3].power = 0;
1151
1152         /* Set D3cold's explicit_set flag if _PS3 exists. */
1153         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1154                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1155
1156         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1157         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1158                         device->power.flags.power_resources)
1159                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1160
1161         acpi_bus_init_power(device);
1162 }
1163
1164 static void acpi_bus_get_flags(struct acpi_device *device)
1165 {
1166         acpi_status status = AE_OK;
1167         acpi_handle temp = NULL;
1168
1169         /* Presence of _STA indicates 'dynamic_status' */
1170         status = acpi_get_handle(device->handle, "_STA", &temp);
1171         if (ACPI_SUCCESS(status))
1172                 device->flags.dynamic_status = 1;
1173
1174         /* Presence of _RMV indicates 'removable' */
1175         status = acpi_get_handle(device->handle, "_RMV", &temp);
1176         if (ACPI_SUCCESS(status))
1177                 device->flags.removable = 1;
1178
1179         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1180         status = acpi_get_handle(device->handle, "_EJD", &temp);
1181         if (ACPI_SUCCESS(status))
1182                 device->flags.ejectable = 1;
1183         else {
1184                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1185                 if (ACPI_SUCCESS(status))
1186                         device->flags.ejectable = 1;
1187         }
1188 }
1189
1190 static void acpi_device_get_busid(struct acpi_device *device)
1191 {
1192         char bus_id[5] = { '?', 0 };
1193         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1194         int i = 0;
1195
1196         /*
1197          * Bus ID
1198          * ------
1199          * The device's Bus ID is simply the object name.
1200          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1201          */
1202         if (ACPI_IS_ROOT_DEVICE(device)) {
1203                 strcpy(device->pnp.bus_id, "ACPI");
1204                 return;
1205         }
1206
1207         switch (device->device_type) {
1208         case ACPI_BUS_TYPE_POWER_BUTTON:
1209                 strcpy(device->pnp.bus_id, "PWRF");
1210                 break;
1211         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1212                 strcpy(device->pnp.bus_id, "SLPF");
1213                 break;
1214         default:
1215                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1216                 /* Clean up trailing underscores (if any) */
1217                 for (i = 3; i > 1; i--) {
1218                         if (bus_id[i] == '_')
1219                                 bus_id[i] = '\0';
1220                         else
1221                                 break;
1222                 }
1223                 strcpy(device->pnp.bus_id, bus_id);
1224                 break;
1225         }
1226 }
1227
1228 /*
1229  * acpi_bay_match - see if a device is an ejectable driver bay
1230  *
1231  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1232  * then we can safely call it an ejectable drive bay
1233  */
1234 static int acpi_bay_match(struct acpi_device *device){
1235         acpi_status status;
1236         acpi_handle handle;
1237         acpi_handle tmp;
1238         acpi_handle phandle;
1239
1240         handle = device->handle;
1241
1242         status = acpi_get_handle(handle, "_EJ0", &tmp);
1243         if (ACPI_FAILURE(status))
1244                 return -ENODEV;
1245
1246         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1247                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1248                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1249                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1250                 return 0;
1251
1252         if (acpi_get_parent(handle, &phandle))
1253                 return -ENODEV;
1254
1255         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1256                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1257                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1258                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1259                 return 0;
1260
1261         return -ENODEV;
1262 }
1263
1264 /*
1265  * acpi_dock_match - see if a device has a _DCK method
1266  */
1267 static int acpi_dock_match(struct acpi_device *device)
1268 {
1269         acpi_handle tmp;
1270         return acpi_get_handle(device->handle, "_DCK", &tmp);
1271 }
1272
1273 const char *acpi_device_hid(struct acpi_device *device)
1274 {
1275         struct acpi_hardware_id *hid;
1276
1277         if (list_empty(&device->pnp.ids))
1278                 return dummy_hid;
1279
1280         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1281         return hid->id;
1282 }
1283 EXPORT_SYMBOL(acpi_device_hid);
1284
1285 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1286 {
1287         struct acpi_hardware_id *id;
1288
1289         id = kmalloc(sizeof(*id), GFP_KERNEL);
1290         if (!id)
1291                 return;
1292
1293         id->id = kstrdup(dev_id, GFP_KERNEL);
1294         if (!id->id) {
1295                 kfree(id);
1296                 return;
1297         }
1298
1299         list_add_tail(&id->list, &device->pnp.ids);
1300 }
1301
1302 /*
1303  * Old IBM workstations have a DSDT bug wherein the SMBus object
1304  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1305  * prefix.  Work around this.
1306  */
1307 static int acpi_ibm_smbus_match(struct acpi_device *device)
1308 {
1309         acpi_handle h_dummy;
1310         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1311         int result;
1312
1313         if (!dmi_name_in_vendors("IBM"))
1314                 return -ENODEV;
1315
1316         /* Look for SMBS object */
1317         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1318         if (result)
1319                 return result;
1320
1321         if (strcmp("SMBS", path.pointer)) {
1322                 result = -ENODEV;
1323                 goto out;
1324         }
1325
1326         /* Does it have the necessary (but misnamed) methods? */
1327         result = -ENODEV;
1328         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1329             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1330             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1331                 result = 0;
1332 out:
1333         kfree(path.pointer);
1334         return result;
1335 }
1336
1337 static void acpi_device_set_id(struct acpi_device *device)
1338 {
1339         acpi_status status;
1340         struct acpi_device_info *info;
1341         struct acpi_pnp_device_id_list *cid_list;
1342         int i;
1343
1344         switch (device->device_type) {
1345         case ACPI_BUS_TYPE_DEVICE:
1346                 if (ACPI_IS_ROOT_DEVICE(device)) {
1347                         acpi_add_id(device, ACPI_SYSTEM_HID);
1348                         break;
1349                 }
1350
1351                 status = acpi_get_object_info(device->handle, &info);
1352                 if (ACPI_FAILURE(status)) {
1353                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1354                         return;
1355                 }
1356
1357                 if (info->valid & ACPI_VALID_HID)
1358                         acpi_add_id(device, info->hardware_id.string);
1359                 if (info->valid & ACPI_VALID_CID) {
1360                         cid_list = &info->compatible_id_list;
1361                         for (i = 0; i < cid_list->count; i++)
1362                                 acpi_add_id(device, cid_list->ids[i].string);
1363                 }
1364                 if (info->valid & ACPI_VALID_ADR) {
1365                         device->pnp.bus_address = info->address;
1366                         device->flags.bus_address = 1;
1367                 }
1368                 if (info->valid & ACPI_VALID_UID)
1369                         device->pnp.unique_id = kstrdup(info->unique_id.string,
1370                                                         GFP_KERNEL);
1371
1372                 kfree(info);
1373
1374                 /*
1375                  * Some devices don't reliably have _HIDs & _CIDs, so add
1376                  * synthetic HIDs to make sure drivers can find them.
1377                  */
1378                 if (acpi_is_video_device(device))
1379                         acpi_add_id(device, ACPI_VIDEO_HID);
1380                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1381                         acpi_add_id(device, ACPI_BAY_HID);
1382                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1383                         acpi_add_id(device, ACPI_DOCK_HID);
1384                 else if (!acpi_ibm_smbus_match(device))
1385                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1386                 else if (list_empty(&device->pnp.ids) &&
1387                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1388                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1389                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1390                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1391                 }
1392
1393                 break;
1394         case ACPI_BUS_TYPE_POWER:
1395                 acpi_add_id(device, ACPI_POWER_HID);
1396                 break;
1397         case ACPI_BUS_TYPE_PROCESSOR:
1398                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1399                 break;
1400         case ACPI_BUS_TYPE_THERMAL:
1401                 acpi_add_id(device, ACPI_THERMAL_HID);
1402                 break;
1403         case ACPI_BUS_TYPE_POWER_BUTTON:
1404                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1405                 break;
1406         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1407                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1408                 break;
1409         }
1410 }
1411
1412 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1413                              int type, unsigned long long sta)
1414 {
1415         INIT_LIST_HEAD(&device->pnp.ids);
1416         device->device_type = type;
1417         device->handle = handle;
1418         device->parent = acpi_bus_get_parent(handle);
1419         STRUCT_TO_INT(device->status) = sta;
1420         acpi_device_get_busid(device);
1421         acpi_device_set_id(device);
1422         acpi_bus_get_flags(device);
1423         device->flags.match_driver = false;
1424         device_initialize(&device->dev);
1425         dev_set_uevent_suppress(&device->dev, true);
1426 }
1427
1428 void acpi_device_add_finalize(struct acpi_device *device)
1429 {
1430         device->flags.match_driver = true;
1431         dev_set_uevent_suppress(&device->dev, false);
1432         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1433 }
1434
1435 static int acpi_add_single_object(struct acpi_device **child,
1436                                   acpi_handle handle, int type,
1437                                   unsigned long long sta)
1438 {
1439         int result;
1440         struct acpi_device *device;
1441         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1442
1443         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1444         if (!device) {
1445                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1446                 return -ENOMEM;
1447         }
1448
1449         acpi_init_device_object(device, handle, type, sta);
1450         acpi_bus_get_power_flags(device);
1451         acpi_bus_get_wakeup_device_flags(device);
1452
1453         result = acpi_device_add(device, acpi_device_release);
1454         if (result) {
1455                 acpi_device_release(&device->dev);
1456                 return result;
1457         }
1458
1459         acpi_power_add_remove_device(device, true);
1460         acpi_device_add_finalize(device);
1461         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1462         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1463                 dev_name(&device->dev), (char *) buffer.pointer,
1464                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1465         kfree(buffer.pointer);
1466         *child = device;
1467         return 0;
1468 }
1469
1470 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1471                                     unsigned long long *sta)
1472 {
1473         acpi_status status;
1474         acpi_object_type acpi_type;
1475
1476         status = acpi_get_type(handle, &acpi_type);
1477         if (ACPI_FAILURE(status))
1478                 return -ENODEV;
1479
1480         switch (acpi_type) {
1481         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1482         case ACPI_TYPE_DEVICE:
1483                 *type = ACPI_BUS_TYPE_DEVICE;
1484                 status = acpi_bus_get_status_handle(handle, sta);
1485                 if (ACPI_FAILURE(status))
1486                         return -ENODEV;
1487                 break;
1488         case ACPI_TYPE_PROCESSOR:
1489                 *type = ACPI_BUS_TYPE_PROCESSOR;
1490                 status = acpi_bus_get_status_handle(handle, sta);
1491                 if (ACPI_FAILURE(status))
1492                         return -ENODEV;
1493                 break;
1494         case ACPI_TYPE_THERMAL:
1495                 *type = ACPI_BUS_TYPE_THERMAL;
1496                 *sta = ACPI_STA_DEFAULT;
1497                 break;
1498         case ACPI_TYPE_POWER:
1499                 *type = ACPI_BUS_TYPE_POWER;
1500                 *sta = ACPI_STA_DEFAULT;
1501                 break;
1502         default:
1503                 return -ENODEV;
1504         }
1505
1506         return 0;
1507 }
1508
1509 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1510                                       void *not_used, void **return_value)
1511 {
1512         struct acpi_device *device = NULL;
1513         int type;
1514         unsigned long long sta;
1515         acpi_status status;
1516         int result;
1517
1518         acpi_bus_get_device(handle, &device);
1519         if (device)
1520                 goto out;
1521
1522         result = acpi_bus_type_and_status(handle, &type, &sta);
1523         if (result)
1524                 return AE_OK;
1525
1526         if (type == ACPI_BUS_TYPE_POWER) {
1527                 acpi_add_power_resource(handle);
1528                 return AE_OK;
1529         }
1530
1531         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1532             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1533                 struct acpi_device_wakeup wakeup;
1534                 acpi_handle temp;
1535
1536                 status = acpi_get_handle(handle, "_PRW", &temp);
1537                 if (ACPI_SUCCESS(status)) {
1538                         acpi_bus_extract_wakeup_device_power_package(handle,
1539                                                                      &wakeup);
1540                         acpi_power_resources_list_free(&wakeup.resources);
1541                 }
1542                 return AE_CTRL_DEPTH;
1543         }
1544
1545         acpi_add_single_object(&device, handle, type, sta);
1546         if (!device)
1547                 return AE_CTRL_DEPTH;
1548
1549  out:
1550         if (!*return_value)
1551                 *return_value = device;
1552
1553         return AE_OK;
1554 }
1555
1556 static int acpi_scan_attach_handler(struct acpi_device *device)
1557 {
1558         struct acpi_scan_handler *handler;
1559         int ret = 0;
1560
1561         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) {
1562                 const struct acpi_device_id *id;
1563
1564                 id = __acpi_match_device(device, handler->ids);
1565                 if (!id)
1566                         continue;
1567
1568                 ret = handler->attach(device, id);
1569                 if (ret > 0) {
1570                         device->handler = handler;
1571                         break;
1572                 } else if (ret < 0) {
1573                         break;
1574                 }
1575         }
1576         return ret;
1577 }
1578
1579 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1580                                           void *not_used, void **ret_not_used)
1581 {
1582         struct acpi_device *device;
1583         unsigned long long sta_not_used;
1584         int ret;
1585
1586         /*
1587          * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1588          * namespace walks prematurely.
1589          */
1590         if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1591                 return AE_OK;
1592
1593         if (acpi_bus_get_device(handle, &device))
1594                 return AE_CTRL_DEPTH;
1595
1596         ret = acpi_scan_attach_handler(device);
1597         if (ret)
1598                 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1599
1600         ret = device_attach(&device->dev);
1601         return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1602 }
1603
1604 /**
1605  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1606  * @handle: Root of the namespace scope to scan.
1607  *
1608  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1609  * found devices.
1610  *
1611  * If no devices were found, -ENODEV is returned, but it does not mean that
1612  * there has been a real error.  There just have been no suitable ACPI objects
1613  * in the table trunk from which the kernel could create a device and add an
1614  * appropriate driver.
1615  */
1616 int acpi_bus_scan(acpi_handle handle)
1617 {
1618         void *device = NULL;
1619         int error = 0;
1620
1621         mutex_lock(&acpi_scan_lock);
1622
1623         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1624                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1625                                     acpi_bus_check_add, NULL, NULL, &device);
1626
1627         if (!device)
1628                 error = -ENODEV;
1629         else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1630                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1631                                     acpi_bus_device_attach, NULL, NULL, NULL);
1632
1633         mutex_unlock(&acpi_scan_lock);
1634         return error;
1635 }
1636 EXPORT_SYMBOL(acpi_bus_scan);
1637
1638 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1639                                           void *not_used, void **ret_not_used)
1640 {
1641         struct acpi_device *device = NULL;
1642
1643         if (!acpi_bus_get_device(handle, &device)) {
1644                 struct acpi_scan_handler *dev_handler = device->handler;
1645
1646                 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1647                 if (dev_handler) {
1648                         if (dev_handler->detach)
1649                                 dev_handler->detach(device);
1650
1651                         device->handler = NULL;
1652                 } else {
1653                         device_release_driver(&device->dev);
1654                 }
1655         }
1656         return AE_OK;
1657 }
1658
1659 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1660                                    void *not_used, void **ret_not_used)
1661 {
1662         struct acpi_device *device = NULL;
1663
1664         if (!acpi_bus_get_device(handle, &device))
1665                 acpi_device_unregister(device);
1666
1667         return AE_OK;
1668 }
1669
1670 void acpi_bus_trim(struct acpi_device *start)
1671 {
1672         mutex_lock(&acpi_scan_lock);
1673
1674         /*
1675          * Execute acpi_bus_device_detach() as a post-order callback to detach
1676          * all ACPI drivers from the device nodes being removed.
1677          */
1678         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1679                             acpi_bus_device_detach, NULL, NULL);
1680         acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1681         /*
1682          * Execute acpi_bus_remove() as a post-order callback to remove device
1683          * nodes in the given namespace scope.
1684          */
1685         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1686                             acpi_bus_remove, NULL, NULL);
1687         acpi_bus_remove(start->handle, 0, NULL, NULL);
1688
1689         mutex_unlock(&acpi_scan_lock);
1690 }
1691 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1692
1693 static int acpi_bus_scan_fixed(void)
1694 {
1695         int result = 0;
1696
1697         /*
1698          * Enumerate all fixed-feature devices.
1699          */
1700         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1701                 struct acpi_device *device = NULL;
1702
1703                 result = acpi_add_single_object(&device, NULL,
1704                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1705                                                 ACPI_STA_DEFAULT);
1706                 if (result)
1707                         return result;
1708
1709                 result = device_attach(&device->dev);
1710                 if (result < 0)
1711                         return result;
1712
1713                 device_init_wakeup(&device->dev, true);
1714         }
1715
1716         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1717                 struct acpi_device *device = NULL;
1718
1719                 result = acpi_add_single_object(&device, NULL,
1720                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1721                                                 ACPI_STA_DEFAULT);
1722                 if (result)
1723                         return result;
1724
1725                 result = device_attach(&device->dev);
1726         }
1727
1728         return result < 0 ? result : 0;
1729 }
1730
1731 int __init acpi_scan_init(void)
1732 {
1733         int result;
1734
1735         result = bus_register(&acpi_bus_type);
1736         if (result) {
1737                 /* We don't want to quit even if we failed to add suspend/resume */
1738                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1739         }
1740
1741         acpi_pci_root_init();
1742         acpi_pci_link_init();
1743         acpi_platform_init();
1744         acpi_csrt_init();
1745
1746         /*
1747          * Enumerate devices in the ACPI namespace.
1748          */
1749         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1750         if (result)
1751                 return result;
1752
1753         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1754         if (result)
1755                 return result;
1756
1757         result = acpi_bus_scan_fixed();
1758         if (result) {
1759                 acpi_device_unregister(acpi_root);
1760                 return result;
1761         }
1762
1763         acpi_update_all_gpes();
1764         return 0;
1765 }