2 * scan.c - support for transforming the ACPI namespace into individual objects
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/kernel.h>
8 #include <linux/acpi.h>
10 #include <acpi/acpi_drivers.h>
11 #include <acpi/acinterp.h> /* for acpi_ex_eisa_id_to_string() */
13 #define _COMPONENT ACPI_BUS_COMPONENT
14 ACPI_MODULE_NAME("scan");
15 #define STRUCT_TO_INT(s) (*((int*)&s))
16 extern struct acpi_device *acpi_root;
18 #define ACPI_BUS_CLASS "system_bus"
19 #define ACPI_BUS_HID "LNXSYBUS"
20 #define ACPI_BUS_DEVICE_NAME "System Bus"
22 static LIST_HEAD(acpi_device_list);
23 static LIST_HEAD(acpi_bus_id_list);
24 DEFINE_SPINLOCK(acpi_device_lock);
25 LIST_HEAD(acpi_wakeup_device_list);
27 struct acpi_device_bus_id{
29 unsigned int instance_no;
30 struct list_head node;
34 * Creates hid/cid(s) string needed for modalias and uevent
35 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
36 * char *modalias: "acpi:IBM0001:ACPI0001"
38 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
44 if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
47 len = snprintf(modalias, size, "acpi:");
50 if (acpi_dev->flags.hardware_id) {
51 count = snprintf(&modalias[len], size, "%s:",
52 acpi_dev->pnp.hardware_id);
53 if (count < 0 || count >= size)
59 if (acpi_dev->flags.compatible_ids) {
60 struct acpi_compatible_id_list *cid_list;
63 cid_list = acpi_dev->pnp.cid_list;
64 for (i = 0; i < cid_list->count; i++) {
65 count = snprintf(&modalias[len], size, "%s:",
66 cid_list->id[i].value);
67 if (count < 0 || count >= size) {
68 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
69 acpi_dev->pnp.device_name, i);
82 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
83 struct acpi_device *acpi_dev = to_acpi_device(dev);
86 /* Device has no HID and no CID or string is >1024 */
87 len = create_modalias(acpi_dev, buf, 1024);
93 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
95 static int acpi_eject_operation(acpi_handle handle, int lockable)
97 struct acpi_object_list arg_list;
98 union acpi_object arg;
99 acpi_status status = AE_OK;
102 * TBD: evaluate _PS3?
107 arg_list.pointer = &arg;
108 arg.type = ACPI_TYPE_INTEGER;
109 arg.integer.value = 0;
110 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
114 arg_list.pointer = &arg;
115 arg.type = ACPI_TYPE_INTEGER;
116 arg.integer.value = 1;
122 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
123 if (ACPI_FAILURE(status)) {
131 acpi_eject_store(struct device *d, struct device_attribute *attr,
132 const char *buf, size_t count)
139 acpi_object_type type = 0;
140 struct acpi_device *acpi_device = to_acpi_device(d);
142 if ((!count) || (buf[0] != '1')) {
146 if (acpi_device->driver == NULL) {
151 status = acpi_get_type(acpi_device->handle, &type);
152 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
157 islockable = acpi_device->flags.lockable;
158 handle = acpi_device->handle;
160 result = acpi_bus_trim(acpi_device, 1);
163 result = acpi_eject_operation(handle, islockable);
172 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
175 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
176 struct acpi_device *acpi_dev = to_acpi_device(dev);
178 return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
180 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
183 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
184 struct acpi_device *acpi_dev = to_acpi_device(dev);
185 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
188 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
192 result = sprintf(buf, "%s\n", (char*)path.pointer);
197 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
199 static int acpi_device_setup_files(struct acpi_device *dev)
206 * Devices gotten from FADT don't have a "path" attribute
209 result = device_create_file(&dev->dev, &dev_attr_path);
214 if(dev->flags.hardware_id) {
215 result = device_create_file(&dev->dev, &dev_attr_hid);
220 if (dev->flags.hardware_id || dev->flags.compatible_ids){
221 result = device_create_file(&dev->dev, &dev_attr_modalias);
227 * If device has _EJ0, 'eject' file is created that is used to trigger
228 * hot-removal function from userland.
230 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
231 if (ACPI_SUCCESS(status))
232 result = device_create_file(&dev->dev, &dev_attr_eject);
237 static void acpi_device_remove_files(struct acpi_device *dev)
243 * If device has _EJ0, 'eject' file is created that is used to trigger
244 * hot-removal function from userland.
246 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
247 if (ACPI_SUCCESS(status))
248 device_remove_file(&dev->dev, &dev_attr_eject);
250 if (dev->flags.hardware_id || dev->flags.compatible_ids)
251 device_remove_file(&dev->dev, &dev_attr_modalias);
253 if(dev->flags.hardware_id)
254 device_remove_file(&dev->dev, &dev_attr_hid);
256 device_remove_file(&dev->dev, &dev_attr_path);
258 /* --------------------------------------------------------------------------
260 -------------------------------------------------------------------------- */
262 int acpi_match_device_ids(struct acpi_device *device,
263 const struct acpi_device_id *ids)
265 const struct acpi_device_id *id;
267 if (device->flags.hardware_id) {
268 for (id = ids; id->id[0]; id++) {
269 if (!strcmp((char*)id->id, device->pnp.hardware_id))
274 if (device->flags.compatible_ids) {
275 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
278 for (id = ids; id->id[0]; id++) {
279 /* compare multiple _CID entries against driver ids */
280 for (i = 0; i < cid_list->count; i++) {
281 if (!strcmp((char*)id->id,
282 cid_list->id[i].value))
290 EXPORT_SYMBOL(acpi_match_device_ids);
292 static void acpi_device_release(struct device *dev)
294 struct acpi_device *acpi_dev = to_acpi_device(dev);
296 kfree(acpi_dev->pnp.cid_list);
300 static int acpi_device_suspend(struct device *dev, pm_message_t state)
302 struct acpi_device *acpi_dev = to_acpi_device(dev);
303 struct acpi_driver *acpi_drv = acpi_dev->driver;
305 if (acpi_drv && acpi_drv->ops.suspend)
306 return acpi_drv->ops.suspend(acpi_dev, state);
310 static int acpi_device_resume(struct device *dev)
312 struct acpi_device *acpi_dev = to_acpi_device(dev);
313 struct acpi_driver *acpi_drv = acpi_dev->driver;
315 if (acpi_drv && acpi_drv->ops.resume)
316 return acpi_drv->ops.resume(acpi_dev);
320 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
322 struct acpi_device *acpi_dev = to_acpi_device(dev);
323 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
325 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
328 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
330 struct acpi_device *acpi_dev = to_acpi_device(dev);
333 if (add_uevent_var(env, "MODALIAS="))
335 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
336 sizeof(env->buf) - env->buflen);
337 if (len >= (sizeof(env->buf) - env->buflen))
343 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
344 static int acpi_start_single_object(struct acpi_device *);
345 static int acpi_device_probe(struct device * dev)
347 struct acpi_device *acpi_dev = to_acpi_device(dev);
348 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
351 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
353 if (acpi_dev->bus_ops.acpi_op_start)
354 acpi_start_single_object(acpi_dev);
355 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
356 "Found driver [%s] for device [%s]\n",
357 acpi_drv->name, acpi_dev->pnp.bus_id));
363 static int acpi_device_remove(struct device * dev)
365 struct acpi_device *acpi_dev = to_acpi_device(dev);
366 struct acpi_driver *acpi_drv = acpi_dev->driver;
369 if (acpi_drv->ops.stop)
370 acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
371 if (acpi_drv->ops.remove)
372 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
374 acpi_dev->driver = NULL;
375 acpi_driver_data(dev) = NULL;
381 static void acpi_device_shutdown(struct device *dev)
383 struct acpi_device *acpi_dev = to_acpi_device(dev);
384 struct acpi_driver *acpi_drv = acpi_dev->driver;
386 if (acpi_drv && acpi_drv->ops.shutdown)
387 acpi_drv->ops.shutdown(acpi_dev);
392 struct bus_type acpi_bus_type = {
394 .suspend = acpi_device_suspend,
395 .resume = acpi_device_resume,
396 .shutdown = acpi_device_shutdown,
397 .match = acpi_bus_match,
398 .probe = acpi_device_probe,
399 .remove = acpi_device_remove,
400 .uevent = acpi_device_uevent,
403 static int acpi_device_register(struct acpi_device *device,
404 struct acpi_device *parent)
407 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
412 * Link this device to its parent and siblings.
414 INIT_LIST_HEAD(&device->children);
415 INIT_LIST_HEAD(&device->node);
416 INIT_LIST_HEAD(&device->g_list);
417 INIT_LIST_HEAD(&device->wakeup_list);
419 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
421 printk(KERN_ERR PREFIX "Memory allocation error\n");
425 spin_lock(&acpi_device_lock);
427 * Find suitable bus_id and instance number in acpi_bus_id_list
428 * If failed, create one and link it into acpi_bus_id_list
430 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
431 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
432 acpi_device_bus_id->instance_no ++;
439 acpi_device_bus_id = new_bus_id;
440 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
441 acpi_device_bus_id->instance_no = 0;
442 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
444 sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
446 if (device->parent) {
447 list_add_tail(&device->node, &device->parent->children);
448 list_add_tail(&device->g_list, &device->parent->g_list);
450 list_add_tail(&device->g_list, &acpi_device_list);
451 if (device->wakeup.flags.valid)
452 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
453 spin_unlock(&acpi_device_lock);
456 device->dev.parent = &parent->dev;
457 device->dev.bus = &acpi_bus_type;
458 device_initialize(&device->dev);
459 device->dev.release = &acpi_device_release;
460 result = device_add(&device->dev);
462 printk(KERN_ERR PREFIX "Error adding device %s", device->dev.bus_id);
466 result = acpi_device_setup_files(device);
468 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id));
470 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
473 spin_lock(&acpi_device_lock);
474 if (device->parent) {
475 list_del(&device->node);
476 list_del(&device->g_list);
478 list_del(&device->g_list);
479 list_del(&device->wakeup_list);
480 spin_unlock(&acpi_device_lock);
484 static void acpi_device_unregister(struct acpi_device *device, int type)
486 spin_lock(&acpi_device_lock);
487 if (device->parent) {
488 list_del(&device->node);
489 list_del(&device->g_list);
491 list_del(&device->g_list);
493 list_del(&device->wakeup_list);
494 spin_unlock(&acpi_device_lock);
496 acpi_detach_data(device->handle, acpi_bus_data_handler);
498 acpi_device_remove_files(device);
499 device_unregister(&device->dev);
502 /* --------------------------------------------------------------------------
504 -------------------------------------------------------------------------- */
506 * acpi_bus_driver_init - add a device to a driver
507 * @device: the device to add and initialize
508 * @driver: driver for the device
510 * Used to initialize a device via its device driver. Called whenever a
511 * driver is bound to a device. Invokes the driver's add() ops.
514 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
519 if (!device || !driver)
522 if (!driver->ops.add)
525 result = driver->ops.add(device);
527 device->driver = NULL;
528 acpi_driver_data(device) = NULL;
532 device->driver = driver;
535 * TBD - Configuration Management: Assign resources to device based
536 * upon possible configuration and currently allocated resources.
539 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
540 "Driver successfully bound to device\n"));
544 static int acpi_start_single_object(struct acpi_device *device)
547 struct acpi_driver *driver;
550 if (!(driver = device->driver))
553 if (driver->ops.start) {
554 result = driver->ops.start(device);
555 if (result && driver->ops.remove)
556 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
563 * acpi_bus_register_driver - register a driver with the ACPI bus
564 * @driver: driver being registered
566 * Registers a driver with the ACPI bus. Searches the namespace for all
567 * devices that match the driver's criteria and binds. Returns zero for
568 * success or a negative error status for failure.
570 int acpi_bus_register_driver(struct acpi_driver *driver)
576 driver->drv.name = driver->name;
577 driver->drv.bus = &acpi_bus_type;
578 driver->drv.owner = driver->owner;
580 ret = driver_register(&driver->drv);
584 EXPORT_SYMBOL(acpi_bus_register_driver);
587 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
588 * @driver: driver to unregister
590 * Unregisters a driver with the ACPI bus. Searches the namespace for all
591 * devices that match the driver's criteria and unbinds.
593 void acpi_bus_unregister_driver(struct acpi_driver *driver)
595 driver_unregister(&driver->drv);
598 EXPORT_SYMBOL(acpi_bus_unregister_driver);
600 /* --------------------------------------------------------------------------
602 -------------------------------------------------------------------------- */
604 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
608 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
609 union acpi_object *obj;
611 status = acpi_get_handle(handle, "_EJD", &tmp);
612 if (ACPI_FAILURE(status))
615 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
616 if (ACPI_SUCCESS(status)) {
617 obj = buffer.pointer;
618 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
620 kfree(buffer.pointer);
624 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
626 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
634 static int acpi_bus_get_perf_flags(struct acpi_device *device)
636 device->performance.state = ACPI_STATE_UNKNOWN;
641 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
642 union acpi_object *package)
645 union acpi_object *element = NULL;
647 if (!device || !package || (package->package.count < 2))
648 return AE_BAD_PARAMETER;
650 element = &(package->package.elements[0]);
652 return AE_BAD_PARAMETER;
653 if (element->type == ACPI_TYPE_PACKAGE) {
654 if ((element->package.count < 2) ||
655 (element->package.elements[0].type !=
656 ACPI_TYPE_LOCAL_REFERENCE)
657 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
659 device->wakeup.gpe_device =
660 element->package.elements[0].reference.handle;
661 device->wakeup.gpe_number =
662 (u32) element->package.elements[1].integer.value;
663 } else if (element->type == ACPI_TYPE_INTEGER) {
664 device->wakeup.gpe_number = element->integer.value;
668 element = &(package->package.elements[1]);
669 if (element->type != ACPI_TYPE_INTEGER) {
672 device->wakeup.sleep_state = element->integer.value;
674 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
677 device->wakeup.resources.count = package->package.count - 2;
678 for (i = 0; i < device->wakeup.resources.count; i++) {
679 element = &(package->package.elements[i + 2]);
680 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
683 device->wakeup.resources.handles[i] = element->reference.handle;
689 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
691 acpi_status status = 0;
692 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
693 union acpi_object *package = NULL;
695 struct acpi_device_id button_device_ids[] = {
704 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
705 if (ACPI_FAILURE(status)) {
706 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
710 package = (union acpi_object *)buffer.pointer;
711 status = acpi_bus_extract_wakeup_device_power_package(device, package);
712 if (ACPI_FAILURE(status)) {
713 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
717 kfree(buffer.pointer);
719 device->wakeup.flags.valid = 1;
720 /* Power button, Lid switch always enable wakeup */
721 if (!acpi_match_device_ids(device, button_device_ids))
722 device->wakeup.flags.run_wake = 1;
725 if (ACPI_FAILURE(status))
726 device->flags.wake_capable = 0;
730 static int acpi_bus_get_power_flags(struct acpi_device *device)
732 acpi_status status = 0;
733 acpi_handle handle = NULL;
738 * Power Management Flags
740 status = acpi_get_handle(device->handle, "_PSC", &handle);
741 if (ACPI_SUCCESS(status))
742 device->power.flags.explicit_get = 1;
743 status = acpi_get_handle(device->handle, "_IRC", &handle);
744 if (ACPI_SUCCESS(status))
745 device->power.flags.inrush_current = 1;
748 * Enumerate supported power management states
750 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
751 struct acpi_device_power_state *ps = &device->power.states[i];
752 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
754 /* Evaluate "_PRx" to se if power resources are referenced */
755 acpi_evaluate_reference(device->handle, object_name, NULL,
757 if (ps->resources.count) {
758 device->power.flags.power_resources = 1;
762 /* Evaluate "_PSx" to see if we can do explicit sets */
763 object_name[2] = 'S';
764 status = acpi_get_handle(device->handle, object_name, &handle);
765 if (ACPI_SUCCESS(status)) {
766 ps->flags.explicit_set = 1;
770 /* State is valid if we have some power control */
771 if (ps->resources.count || ps->flags.explicit_set)
774 ps->power = -1; /* Unknown - driver assigned */
775 ps->latency = -1; /* Unknown - driver assigned */
778 /* Set defaults for D0 and D3 states (always valid) */
779 device->power.states[ACPI_STATE_D0].flags.valid = 1;
780 device->power.states[ACPI_STATE_D0].power = 100;
781 device->power.states[ACPI_STATE_D3].flags.valid = 1;
782 device->power.states[ACPI_STATE_D3].power = 0;
784 /* TBD: System wake support and resource requirements. */
786 device->power.state = ACPI_STATE_UNKNOWN;
791 static int acpi_bus_get_flags(struct acpi_device *device)
793 acpi_status status = AE_OK;
794 acpi_handle temp = NULL;
797 /* Presence of _STA indicates 'dynamic_status' */
798 status = acpi_get_handle(device->handle, "_STA", &temp);
799 if (ACPI_SUCCESS(status))
800 device->flags.dynamic_status = 1;
802 /* Presence of _CID indicates 'compatible_ids' */
803 status = acpi_get_handle(device->handle, "_CID", &temp);
804 if (ACPI_SUCCESS(status))
805 device->flags.compatible_ids = 1;
807 /* Presence of _RMV indicates 'removable' */
808 status = acpi_get_handle(device->handle, "_RMV", &temp);
809 if (ACPI_SUCCESS(status))
810 device->flags.removable = 1;
812 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
813 status = acpi_get_handle(device->handle, "_EJD", &temp);
814 if (ACPI_SUCCESS(status))
815 device->flags.ejectable = 1;
817 status = acpi_get_handle(device->handle, "_EJ0", &temp);
818 if (ACPI_SUCCESS(status))
819 device->flags.ejectable = 1;
822 /* Presence of _LCK indicates 'lockable' */
823 status = acpi_get_handle(device->handle, "_LCK", &temp);
824 if (ACPI_SUCCESS(status))
825 device->flags.lockable = 1;
827 /* Presence of _PS0|_PR0 indicates 'power manageable' */
828 status = acpi_get_handle(device->handle, "_PS0", &temp);
829 if (ACPI_FAILURE(status))
830 status = acpi_get_handle(device->handle, "_PR0", &temp);
831 if (ACPI_SUCCESS(status))
832 device->flags.power_manageable = 1;
834 /* Presence of _PRW indicates wake capable */
835 status = acpi_get_handle(device->handle, "_PRW", &temp);
836 if (ACPI_SUCCESS(status))
837 device->flags.wake_capable = 1;
839 /* TBD: Performance management */
844 static void acpi_device_get_busid(struct acpi_device *device,
845 acpi_handle handle, int type)
847 char bus_id[5] = { '?', 0 };
848 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
854 * The device's Bus ID is simply the object name.
855 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
858 case ACPI_BUS_TYPE_SYSTEM:
859 strcpy(device->pnp.bus_id, "ACPI");
861 case ACPI_BUS_TYPE_POWER_BUTTON:
862 strcpy(device->pnp.bus_id, "PWRF");
864 case ACPI_BUS_TYPE_SLEEP_BUTTON:
865 strcpy(device->pnp.bus_id, "SLPF");
868 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
869 /* Clean up trailing underscores (if any) */
870 for (i = 3; i > 1; i--) {
871 if (bus_id[i] == '_')
876 strcpy(device->pnp.bus_id, bus_id);
882 acpi_video_bus_match(struct acpi_device *device)
884 acpi_handle h_dummy1;
885 acpi_handle h_dummy2;
886 acpi_handle h_dummy3;
892 /* Since there is no HID, CID for ACPI Video drivers, we have
893 * to check well known required nodes for each feature we support.
896 /* Does this device able to support video switching ? */
897 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
898 ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
901 /* Does this device able to retrieve a video ROM ? */
902 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
905 /* Does this device able to configure which video head to be POSTed ? */
906 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
907 ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
908 ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
915 * acpi_bay_match - see if a device is an ejectable driver bay
917 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
918 * then we can safely call it an ejectable drive bay
920 static int acpi_bay_match(struct acpi_device *device){
926 handle = device->handle;
928 status = acpi_get_handle(handle, "_EJ0", &tmp);
929 if (ACPI_FAILURE(status))
932 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
933 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
934 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
935 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
938 if (acpi_get_parent(handle, &phandle))
941 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
942 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
943 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
944 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
951 * acpi_dock_match - see if a device has a _DCK method
953 static int acpi_dock_match(struct acpi_device *device)
956 return acpi_get_handle(device->handle, "_DCK", &tmp);
959 static void acpi_device_set_id(struct acpi_device *device,
960 struct acpi_device *parent, acpi_handle handle,
963 struct acpi_device_info *info;
964 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
967 struct acpi_compatible_id_list *cid_list = NULL;
968 const char *cid_add = NULL;
972 case ACPI_BUS_TYPE_DEVICE:
973 status = acpi_get_object_info(handle, &buffer);
974 if (ACPI_FAILURE(status)) {
975 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
979 info = buffer.pointer;
980 if (info->valid & ACPI_VALID_HID)
981 hid = info->hardware_id.value;
982 if (info->valid & ACPI_VALID_UID)
983 uid = info->unique_id.value;
984 if (info->valid & ACPI_VALID_CID)
985 cid_list = &info->compatibility_id;
986 if (info->valid & ACPI_VALID_ADR) {
987 device->pnp.bus_address = info->address;
988 device->flags.bus_address = 1;
991 /* If we have a video/bay/dock device, add our selfdefined
992 HID to the CID list. Like that the video/bay/dock drivers
993 will get autoloaded and the device might still match
994 against another driver.
996 if (ACPI_SUCCESS(acpi_video_bus_match(device)))
997 cid_add = ACPI_VIDEO_HID;
998 else if (ACPI_SUCCESS(acpi_bay_match(device)))
999 cid_add = ACPI_BAY_HID;
1000 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1001 cid_add = ACPI_DOCK_HID;
1004 case ACPI_BUS_TYPE_POWER:
1005 hid = ACPI_POWER_HID;
1007 case ACPI_BUS_TYPE_PROCESSOR:
1008 hid = ACPI_PROCESSOR_HID;
1010 case ACPI_BUS_TYPE_SYSTEM:
1011 hid = ACPI_SYSTEM_HID;
1013 case ACPI_BUS_TYPE_THERMAL:
1014 hid = ACPI_THERMAL_HID;
1016 case ACPI_BUS_TYPE_POWER_BUTTON:
1017 hid = ACPI_BUTTON_HID_POWERF;
1019 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1020 hid = ACPI_BUTTON_HID_SLEEPF;
1027 * Fix for the system root bus device -- the only root-level device.
1029 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1031 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1032 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1036 strcpy(device->pnp.hardware_id, hid);
1037 device->flags.hardware_id = 1;
1040 strcpy(device->pnp.unique_id, uid);
1041 device->flags.unique_id = 1;
1043 if (cid_list || cid_add) {
1044 struct acpi_compatible_id_list *list;
1049 size = cid_list->size;
1050 } else if (cid_add) {
1051 size = sizeof(struct acpi_compatible_id_list);
1052 cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1054 printk(KERN_ERR "Memory allocation error\n");
1055 kfree(buffer.pointer);
1058 cid_list->count = 0;
1059 cid_list->size = size;
1063 size += sizeof(struct acpi_compatible_id);
1064 list = kmalloc(size, GFP_KERNEL);
1068 memcpy(list, cid_list, cid_list->size);
1069 count = cid_list->count;
1072 strncpy(list->id[count].value, cid_add,
1073 ACPI_MAX_CID_LENGTH);
1075 device->flags.compatible_ids = 1;
1078 list->count = count;
1079 device->pnp.cid_list = list;
1081 printk(KERN_ERR PREFIX "Memory allocation error\n");
1084 kfree(buffer.pointer);
1087 static int acpi_device_set_context(struct acpi_device *device, int type)
1089 acpi_status status = AE_OK;
1094 * Attach this 'struct acpi_device' to the ACPI object. This makes
1095 * resolutions from handle->device very efficient. Note that we need
1096 * to be careful with fixed-feature devices as they all attach to the
1099 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1100 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1101 status = acpi_attach_data(device->handle,
1102 acpi_bus_data_handler, device);
1104 if (ACPI_FAILURE(status)) {
1105 printk(KERN_ERR PREFIX "Error attaching device data\n");
1112 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1117 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1118 device_release_driver(&dev->dev);
1124 * unbind _ADR-Based Devices when hot removal
1126 if (dev->flags.bus_address) {
1127 if ((dev->parent) && (dev->parent->ops.unbind))
1128 dev->parent->ops.unbind(dev);
1130 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1136 acpi_is_child_device(struct acpi_device *device,
1137 int (*matcher)(struct acpi_device *))
1139 int result = -ENODEV;
1142 if (ACPI_SUCCESS(matcher(device)))
1144 } while ((device = device->parent));
1150 acpi_add_single_object(struct acpi_device **child,
1151 struct acpi_device *parent, acpi_handle handle, int type,
1152 struct acpi_bus_ops *ops)
1155 struct acpi_device *device = NULL;
1161 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1163 printk(KERN_ERR PREFIX "Memory allocation error\n");
1167 device->handle = handle;
1168 device->parent = parent;
1169 device->bus_ops = *ops; /* workround for not call .start */
1172 acpi_device_get_busid(device, handle, type);
1177 * Get prior to calling acpi_bus_get_status() so we know whether
1178 * or not _STA is present. Note that we only look for object
1179 * handles -- cannot evaluate objects until we know the device is
1180 * present and properly initialized.
1182 result = acpi_bus_get_flags(device);
1189 * See if the device is present. We always assume that non-Device
1190 * and non-Processor objects (e.g. thermal zones, power resources,
1191 * etc.) are present, functioning, etc. (at least when parent object
1192 * is present). Note that _STA has a different meaning for some
1193 * objects (e.g. power resources) so we need to be careful how we use
1197 case ACPI_BUS_TYPE_PROCESSOR:
1198 case ACPI_BUS_TYPE_DEVICE:
1199 result = acpi_bus_get_status(device);
1200 if (ACPI_FAILURE(result)) {
1204 if (!device->status.present) {
1205 /* Bay and dock should be handled even if absent */
1207 acpi_is_child_device(device, acpi_bay_match)) &&
1209 acpi_is_child_device(device, acpi_dock_match))) {
1216 STRUCT_TO_INT(device->status) =
1217 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1218 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
1225 * TBD: Synch with Core's enumeration/initialization process.
1229 * Hardware ID, Unique ID, & Bus Address
1230 * -------------------------------------
1232 acpi_device_set_id(device, parent, handle, type);
1238 if (device->flags.power_manageable) {
1239 result = acpi_bus_get_power_flags(device);
1245 * Wakeup device management
1246 *-----------------------
1248 if (device->flags.wake_capable) {
1249 result = acpi_bus_get_wakeup_device_flags(device);
1255 * Performance Management
1256 * ----------------------
1258 if (device->flags.performance_manageable) {
1259 result = acpi_bus_get_perf_flags(device);
1264 if ((result = acpi_device_set_context(device, type)))
1267 result = acpi_device_register(device, parent);
1270 * Bind _ADR-Based Devices when hot add
1272 if (device->flags.bus_address) {
1273 if (device->parent && device->parent->ops.bind)
1274 device->parent->ops.bind(device);
1281 kfree(device->pnp.cid_list);
1288 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1290 acpi_status status = AE_OK;
1291 struct acpi_device *parent = NULL;
1292 struct acpi_device *child = NULL;
1293 acpi_handle phandle = NULL;
1294 acpi_handle chandle = NULL;
1295 acpi_object_type type = 0;
1303 phandle = start->handle;
1306 * Parse through the ACPI namespace, identify all 'devices', and
1307 * create a new 'struct acpi_device' for each.
1309 while ((level > 0) && parent) {
1311 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1315 * If this scope is exhausted then move our way back up.
1317 if (ACPI_FAILURE(status)) {
1320 acpi_get_parent(phandle, &phandle);
1322 parent = parent->parent;
1326 status = acpi_get_type(chandle, &type);
1327 if (ACPI_FAILURE(status))
1331 * If this is a scope object then parse it (depth-first).
1333 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1341 * We're only interested in objects that we consider 'devices'.
1344 case ACPI_TYPE_DEVICE:
1345 type = ACPI_BUS_TYPE_DEVICE;
1347 case ACPI_TYPE_PROCESSOR:
1348 type = ACPI_BUS_TYPE_PROCESSOR;
1350 case ACPI_TYPE_THERMAL:
1351 type = ACPI_BUS_TYPE_THERMAL;
1353 case ACPI_TYPE_POWER:
1354 type = ACPI_BUS_TYPE_POWER;
1360 if (ops->acpi_op_add)
1361 status = acpi_add_single_object(&child, parent,
1362 chandle, type, ops);
1364 status = acpi_bus_get_device(chandle, &child);
1366 if (ACPI_FAILURE(status))
1369 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1370 status = acpi_start_single_object(child);
1371 if (ACPI_FAILURE(status))
1376 * If the device is present, enabled, and functioning then
1377 * parse its scope (depth-first). Note that we need to
1378 * represent absent devices to facilitate PnP notifications
1379 * -- but only the subtree head (not all of its children,
1380 * which will be enumerated when the parent is inserted).
1382 * TBD: Need notifications and other detection mechanisms
1383 * in place before we can fully implement this.
1385 if (child->status.present) {
1386 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1388 if (ACPI_SUCCESS(status)) {
1401 acpi_bus_add(struct acpi_device **child,
1402 struct acpi_device *parent, acpi_handle handle, int type)
1405 struct acpi_bus_ops ops;
1407 memset(&ops, 0, sizeof(ops));
1408 ops.acpi_op_add = 1;
1410 result = acpi_add_single_object(child, parent, handle, type, &ops);
1412 result = acpi_bus_scan(*child, &ops);
1417 EXPORT_SYMBOL(acpi_bus_add);
1419 int acpi_bus_start(struct acpi_device *device)
1422 struct acpi_bus_ops ops;
1428 result = acpi_start_single_object(device);
1430 memset(&ops, 0, sizeof(ops));
1431 ops.acpi_op_start = 1;
1432 result = acpi_bus_scan(device, &ops);
1437 EXPORT_SYMBOL(acpi_bus_start);
1439 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1442 struct acpi_device *parent, *child;
1443 acpi_handle phandle, chandle;
1444 acpi_object_type type;
1449 phandle = start->handle;
1450 child = chandle = NULL;
1452 while ((level > 0) && parent && (!err)) {
1453 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1457 * If this scope is exhausted then move our way back up.
1459 if (ACPI_FAILURE(status)) {
1462 acpi_get_parent(phandle, &phandle);
1464 parent = parent->parent;
1467 err = acpi_bus_remove(child, rmdevice);
1469 err = acpi_bus_remove(child, 1);
1474 status = acpi_get_type(chandle, &type);
1475 if (ACPI_FAILURE(status)) {
1479 * If there is a device corresponding to chandle then
1480 * parse it (depth-first).
1482 if (acpi_bus_get_device(chandle, &child) == 0) {
1492 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1495 static int acpi_bus_scan_fixed(struct acpi_device *root)
1498 struct acpi_device *device = NULL;
1499 struct acpi_bus_ops ops;
1504 memset(&ops, 0, sizeof(ops));
1505 ops.acpi_op_add = 1;
1506 ops.acpi_op_start = 1;
1509 * Enumerate all fixed-feature devices.
1511 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1512 result = acpi_add_single_object(&device, acpi_root,
1514 ACPI_BUS_TYPE_POWER_BUTTON,
1518 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1519 result = acpi_add_single_object(&device, acpi_root,
1521 ACPI_BUS_TYPE_SLEEP_BUTTON,
1528 int __init acpi_boot_ec_enable(void);
1530 static int __init acpi_scan_init(void)
1533 struct acpi_bus_ops ops;
1539 memset(&ops, 0, sizeof(ops));
1540 ops.acpi_op_add = 1;
1541 ops.acpi_op_start = 1;
1543 result = bus_register(&acpi_bus_type);
1545 /* We don't want to quit even if we failed to add suspend/resume */
1546 printk(KERN_ERR PREFIX "Could not register bus type\n");
1550 * Create the root device in the bus's device tree
1552 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1553 ACPI_BUS_TYPE_SYSTEM, &ops);
1558 * Enumerate devices in the ACPI namespace.
1560 result = acpi_bus_scan_fixed(acpi_root);
1562 /* EC region might be needed at bus_scan, so enable it now */
1563 acpi_boot_ec_enable();
1566 result = acpi_bus_scan(acpi_root, &ops);
1569 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1575 subsys_initcall(acpi_scan_init);