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 "ACPI_BUS"
20 #define ACPI_BUS_DRIVER_NAME "ACPI Bus Driver"
21 #define ACPI_BUS_DEVICE_NAME "System Bus"
23 static LIST_HEAD(acpi_device_list);
24 DEFINE_SPINLOCK(acpi_device_lock);
25 LIST_HEAD(acpi_wakeup_device_list);
27 static int acpi_eject_operation(acpi_handle handle, int lockable)
29 struct acpi_object_list arg_list;
30 union acpi_object arg;
31 acpi_status status = AE_OK;
39 arg_list.pointer = &arg;
40 arg.type = ACPI_TYPE_INTEGER;
41 arg.integer.value = 0;
42 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
46 arg_list.pointer = &arg;
47 arg.type = ACPI_TYPE_INTEGER;
48 arg.integer.value = 1;
54 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
55 if (ACPI_FAILURE(status)) {
63 acpi_eject_store(struct device *d, struct device_attribute *attr,
64 const char *buf, size_t count)
71 acpi_object_type type = 0;
72 struct acpi_device *acpi_device = to_acpi_device(d);
74 if ((!count) || (buf[0] != '1')) {
78 if (acpi_device->driver == NULL) {
83 status = acpi_get_type(acpi_device->handle, &type);
84 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
89 islockable = acpi_device->flags.lockable;
90 handle = acpi_device->handle;
92 result = acpi_bus_trim(acpi_device, 1);
95 result = acpi_eject_operation(handle, islockable);
104 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
106 static void acpi_device_setup_files(struct acpi_device *dev)
112 * If device has _EJ0, 'eject' file is created that is used to trigger
113 * hot-removal function from userland.
115 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
116 if (ACPI_SUCCESS(status))
117 device_create_file(&dev->dev, &dev_attr_eject);
120 static void acpi_device_remove_files(struct acpi_device *dev)
126 * If device has _EJ0, 'eject' file is created that is used to trigger
127 * hot-removal function from userland.
129 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
130 if (ACPI_SUCCESS(status))
131 device_remove_file(&dev->dev, &dev_attr_eject);
133 /* --------------------------------------------------------------------------
135 -------------------------------------------------------------------------- */
136 static void acpi_device_release(struct device *dev)
138 struct acpi_device *acpi_dev = to_acpi_device(dev);
140 kfree(acpi_dev->pnp.cid_list);
144 static int acpi_device_suspend(struct device *dev, pm_message_t state)
146 struct acpi_device *acpi_dev = to_acpi_device(dev);
147 struct acpi_driver *acpi_drv = acpi_dev->driver;
149 if (acpi_drv && acpi_drv->ops.suspend)
150 return acpi_drv->ops.suspend(acpi_dev, state);
154 static int acpi_device_resume(struct device *dev)
156 struct acpi_device *acpi_dev = to_acpi_device(dev);
157 struct acpi_driver *acpi_drv = acpi_dev->driver;
159 if (acpi_drv && acpi_drv->ops.resume)
160 return acpi_drv->ops.resume(acpi_dev);
164 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
166 struct acpi_device *acpi_dev = to_acpi_device(dev);
167 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
169 return !acpi_match_ids(acpi_dev, acpi_drv->ids);
172 static int acpi_device_uevent(struct device *dev, char **envp, int num_envp,
173 char *buffer, int buffer_size)
175 struct acpi_device *acpi_dev = to_acpi_device(dev);
176 int i = 0, length = 0, ret = 0;
178 if (acpi_dev->flags.hardware_id)
179 ret = add_uevent_var(envp, num_envp, &i,
180 buffer, buffer_size, &length,
181 "HWID=%s", acpi_dev->pnp.hardware_id);
184 if (acpi_dev->flags.compatible_ids) {
186 struct acpi_compatible_id_list *cid_list;
188 cid_list = acpi_dev->pnp.cid_list;
190 for (j = 0; j < cid_list->count; j++) {
191 ret = add_uevent_var(envp, num_envp, &i, buffer,
192 buffer_size, &length, "COMPTID=%s",
193 cid_list->id[j].value);
203 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
204 static int acpi_start_single_object(struct acpi_device *);
205 static int acpi_device_probe(struct device * dev)
207 struct acpi_device *acpi_dev = to_acpi_device(dev);
208 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
211 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
213 if (acpi_dev->bus_ops.acpi_op_start)
214 acpi_start_single_object(acpi_dev);
215 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
216 "Found driver [%s] for device [%s]\n",
217 acpi_drv->name, acpi_dev->pnp.bus_id));
223 static int acpi_device_remove(struct device * dev)
225 struct acpi_device *acpi_dev = to_acpi_device(dev);
226 struct acpi_driver *acpi_drv = acpi_dev->driver;
229 if (acpi_drv->ops.stop)
230 acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
231 if (acpi_drv->ops.remove)
232 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
234 acpi_dev->driver = NULL;
235 acpi_driver_data(dev) = NULL;
241 static void acpi_device_shutdown(struct device *dev)
243 struct acpi_device *acpi_dev = to_acpi_device(dev);
244 struct acpi_driver *acpi_drv = acpi_dev->driver;
246 if (acpi_drv && acpi_drv->ops.shutdown)
247 acpi_drv->ops.shutdown(acpi_dev);
252 static struct bus_type acpi_bus_type = {
254 .suspend = acpi_device_suspend,
255 .resume = acpi_device_resume,
256 .shutdown = acpi_device_shutdown,
257 .match = acpi_bus_match,
258 .probe = acpi_device_probe,
259 .remove = acpi_device_remove,
260 .uevent = acpi_device_uevent,
263 static void acpi_device_register(struct acpi_device *device,
264 struct acpi_device *parent)
269 * Link this device to its parent and siblings.
271 INIT_LIST_HEAD(&device->children);
272 INIT_LIST_HEAD(&device->node);
273 INIT_LIST_HEAD(&device->g_list);
274 INIT_LIST_HEAD(&device->wakeup_list);
276 spin_lock(&acpi_device_lock);
277 if (device->parent) {
278 list_add_tail(&device->node, &device->parent->children);
279 list_add_tail(&device->g_list, &device->parent->g_list);
281 list_add_tail(&device->g_list, &acpi_device_list);
282 if (device->wakeup.flags.valid)
283 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
284 spin_unlock(&acpi_device_lock);
287 device->dev.parent = &parent->dev;
288 device->dev.bus = &acpi_bus_type;
289 device_initialize(&device->dev);
290 sprintf(device->dev.bus_id, "%s", device->pnp.bus_id);
291 device->dev.release = &acpi_device_release;
292 device_add(&device->dev);
294 acpi_device_setup_files(device);
295 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
298 static void acpi_device_unregister(struct acpi_device *device, int type)
300 spin_lock(&acpi_device_lock);
301 if (device->parent) {
302 list_del(&device->node);
303 list_del(&device->g_list);
305 list_del(&device->g_list);
307 list_del(&device->wakeup_list);
308 spin_unlock(&acpi_device_lock);
310 acpi_detach_data(device->handle, acpi_bus_data_handler);
312 acpi_device_remove_files(device);
313 device_unregister(&device->dev);
316 /* --------------------------------------------------------------------------
318 -------------------------------------------------------------------------- */
320 * acpi_bus_driver_init - add a device to a driver
321 * @device: the device to add and initialize
322 * @driver: driver for the device
324 * Used to initialize a device via its device driver. Called whenever a
325 * driver is bound to a device. Invokes the driver's add() ops.
328 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
333 if (!device || !driver)
336 if (!driver->ops.add)
339 result = driver->ops.add(device);
341 device->driver = NULL;
342 acpi_driver_data(device) = NULL;
346 device->driver = driver;
349 * TBD - Configuration Management: Assign resources to device based
350 * upon possible configuration and currently allocated resources.
353 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
354 "Driver successfully bound to device\n"));
358 static int acpi_start_single_object(struct acpi_device *device)
361 struct acpi_driver *driver;
364 if (!(driver = device->driver))
367 if (driver->ops.start) {
368 result = driver->ops.start(device);
369 if (result && driver->ops.remove)
370 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
377 * acpi_bus_register_driver - register a driver with the ACPI bus
378 * @driver: driver being registered
380 * Registers a driver with the ACPI bus. Searches the namespace for all
381 * devices that match the driver's criteria and binds. Returns zero for
382 * success or a negative error status for failure.
384 int acpi_bus_register_driver(struct acpi_driver *driver)
390 driver->drv.name = driver->name;
391 driver->drv.bus = &acpi_bus_type;
392 driver->drv.owner = driver->owner;
394 ret = driver_register(&driver->drv);
398 EXPORT_SYMBOL(acpi_bus_register_driver);
401 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
402 * @driver: driver to unregister
404 * Unregisters a driver with the ACPI bus. Searches the namespace for all
405 * devices that match the driver's criteria and unbinds.
407 void acpi_bus_unregister_driver(struct acpi_driver *driver)
409 driver_unregister(&driver->drv);
412 EXPORT_SYMBOL(acpi_bus_unregister_driver);
414 /* --------------------------------------------------------------------------
416 -------------------------------------------------------------------------- */
418 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
422 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
423 union acpi_object *obj;
425 status = acpi_get_handle(handle, "_EJD", &tmp);
426 if (ACPI_FAILURE(status))
429 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
430 if (ACPI_SUCCESS(status)) {
431 obj = buffer.pointer;
432 status = acpi_get_handle(NULL, obj->string.pointer, ejd);
433 kfree(buffer.pointer);
437 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
439 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
447 int acpi_match_ids(struct acpi_device *device, char *ids)
449 if (device->flags.hardware_id)
450 if (strstr(ids, device->pnp.hardware_id))
453 if (device->flags.compatible_ids) {
454 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
457 /* compare multiple _CID entries against driver ids */
458 for (i = 0; i < cid_list->count; i++) {
459 if (strstr(ids, cid_list->id[i].value))
466 static int acpi_bus_get_perf_flags(struct acpi_device *device)
468 device->performance.state = ACPI_STATE_UNKNOWN;
473 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
474 union acpi_object *package)
477 union acpi_object *element = NULL;
479 if (!device || !package || (package->package.count < 2))
480 return AE_BAD_PARAMETER;
482 element = &(package->package.elements[0]);
484 return AE_BAD_PARAMETER;
485 if (element->type == ACPI_TYPE_PACKAGE) {
486 if ((element->package.count < 2) ||
487 (element->package.elements[0].type !=
488 ACPI_TYPE_LOCAL_REFERENCE)
489 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
491 device->wakeup.gpe_device =
492 element->package.elements[0].reference.handle;
493 device->wakeup.gpe_number =
494 (u32) element->package.elements[1].integer.value;
495 } else if (element->type == ACPI_TYPE_INTEGER) {
496 device->wakeup.gpe_number = element->integer.value;
500 element = &(package->package.elements[1]);
501 if (element->type != ACPI_TYPE_INTEGER) {
504 device->wakeup.sleep_state = element->integer.value;
506 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
509 device->wakeup.resources.count = package->package.count - 2;
510 for (i = 0; i < device->wakeup.resources.count; i++) {
511 element = &(package->package.elements[i + 2]);
512 if (element->type != ACPI_TYPE_ANY) {
516 device->wakeup.resources.handles[i] = element->reference.handle;
522 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
524 acpi_status status = 0;
525 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
526 union acpi_object *package = NULL;
530 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
531 if (ACPI_FAILURE(status)) {
532 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
536 package = (union acpi_object *)buffer.pointer;
537 status = acpi_bus_extract_wakeup_device_power_package(device, package);
538 if (ACPI_FAILURE(status)) {
539 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
543 kfree(buffer.pointer);
545 device->wakeup.flags.valid = 1;
546 /* Power button, Lid switch always enable wakeup */
547 if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E"))
548 device->wakeup.flags.run_wake = 1;
551 if (ACPI_FAILURE(status))
552 device->flags.wake_capable = 0;
556 static int acpi_bus_get_power_flags(struct acpi_device *device)
558 acpi_status status = 0;
559 acpi_handle handle = NULL;
564 * Power Management Flags
566 status = acpi_get_handle(device->handle, "_PSC", &handle);
567 if (ACPI_SUCCESS(status))
568 device->power.flags.explicit_get = 1;
569 status = acpi_get_handle(device->handle, "_IRC", &handle);
570 if (ACPI_SUCCESS(status))
571 device->power.flags.inrush_current = 1;
574 * Enumerate supported power management states
576 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
577 struct acpi_device_power_state *ps = &device->power.states[i];
578 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
580 /* Evaluate "_PRx" to se if power resources are referenced */
581 acpi_evaluate_reference(device->handle, object_name, NULL,
583 if (ps->resources.count) {
584 device->power.flags.power_resources = 1;
588 /* Evaluate "_PSx" to see if we can do explicit sets */
589 object_name[2] = 'S';
590 status = acpi_get_handle(device->handle, object_name, &handle);
591 if (ACPI_SUCCESS(status)) {
592 ps->flags.explicit_set = 1;
596 /* State is valid if we have some power control */
597 if (ps->resources.count || ps->flags.explicit_set)
600 ps->power = -1; /* Unknown - driver assigned */
601 ps->latency = -1; /* Unknown - driver assigned */
604 /* Set defaults for D0 and D3 states (always valid) */
605 device->power.states[ACPI_STATE_D0].flags.valid = 1;
606 device->power.states[ACPI_STATE_D0].power = 100;
607 device->power.states[ACPI_STATE_D3].flags.valid = 1;
608 device->power.states[ACPI_STATE_D3].power = 0;
610 /* TBD: System wake support and resource requirements. */
612 device->power.state = ACPI_STATE_UNKNOWN;
617 static int acpi_bus_get_flags(struct acpi_device *device)
619 acpi_status status = AE_OK;
620 acpi_handle temp = NULL;
623 /* Presence of _STA indicates 'dynamic_status' */
624 status = acpi_get_handle(device->handle, "_STA", &temp);
625 if (ACPI_SUCCESS(status))
626 device->flags.dynamic_status = 1;
628 /* Presence of _CID indicates 'compatible_ids' */
629 status = acpi_get_handle(device->handle, "_CID", &temp);
630 if (ACPI_SUCCESS(status))
631 device->flags.compatible_ids = 1;
633 /* Presence of _RMV indicates 'removable' */
634 status = acpi_get_handle(device->handle, "_RMV", &temp);
635 if (ACPI_SUCCESS(status))
636 device->flags.removable = 1;
638 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
639 status = acpi_get_handle(device->handle, "_EJD", &temp);
640 if (ACPI_SUCCESS(status))
641 device->flags.ejectable = 1;
643 status = acpi_get_handle(device->handle, "_EJ0", &temp);
644 if (ACPI_SUCCESS(status))
645 device->flags.ejectable = 1;
648 /* Presence of _LCK indicates 'lockable' */
649 status = acpi_get_handle(device->handle, "_LCK", &temp);
650 if (ACPI_SUCCESS(status))
651 device->flags.lockable = 1;
653 /* Presence of _PS0|_PR0 indicates 'power manageable' */
654 status = acpi_get_handle(device->handle, "_PS0", &temp);
655 if (ACPI_FAILURE(status))
656 status = acpi_get_handle(device->handle, "_PR0", &temp);
657 if (ACPI_SUCCESS(status))
658 device->flags.power_manageable = 1;
660 /* Presence of _PRW indicates wake capable */
661 status = acpi_get_handle(device->handle, "_PRW", &temp);
662 if (ACPI_SUCCESS(status))
663 device->flags.wake_capable = 1;
665 /* TBD: Peformance management */
670 static void acpi_device_get_busid(struct acpi_device *device,
671 acpi_handle handle, int type)
673 char bus_id[5] = { '?', 0 };
674 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
680 * The device's Bus ID is simply the object name.
681 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
684 case ACPI_BUS_TYPE_SYSTEM:
685 strcpy(device->pnp.bus_id, "ACPI");
687 case ACPI_BUS_TYPE_POWER_BUTTON:
688 strcpy(device->pnp.bus_id, "PWRF");
690 case ACPI_BUS_TYPE_SLEEP_BUTTON:
691 strcpy(device->pnp.bus_id, "SLPF");
694 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
695 /* Clean up trailing underscores (if any) */
696 for (i = 3; i > 1; i--) {
697 if (bus_id[i] == '_')
702 strcpy(device->pnp.bus_id, bus_id);
708 acpi_video_bus_match(struct acpi_device *device)
710 acpi_handle h_dummy1;
711 acpi_handle h_dummy2;
712 acpi_handle h_dummy3;
718 /* Since there is no HID, CID for ACPI Video drivers, we have
719 * to check well known required nodes for each feature we support.
722 /* Does this device able to support video switching ? */
723 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
724 ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
727 /* Does this device able to retrieve a video ROM ? */
728 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
731 /* Does this device able to configure which video head to be POSTed ? */
732 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
733 ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
734 ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
740 static int acpi_pci_bridge_match(struct acpi_device *device)
745 /* pci bridge has _PRT but isn't PNP0A03 */
746 status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
747 if (ACPI_FAILURE(status))
749 if (!acpi_match_ids(device, "PNP0A03"))
754 static void acpi_device_set_id(struct acpi_device *device,
755 struct acpi_device *parent, acpi_handle handle,
758 struct acpi_device_info *info;
759 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
762 struct acpi_compatible_id_list *cid_list = NULL;
766 case ACPI_BUS_TYPE_DEVICE:
767 status = acpi_get_object_info(handle, &buffer);
768 if (ACPI_FAILURE(status)) {
769 printk("%s: Error reading device info\n", __FUNCTION__);
773 info = buffer.pointer;
774 if (info->valid & ACPI_VALID_HID)
775 hid = info->hardware_id.value;
776 if (info->valid & ACPI_VALID_UID)
777 uid = info->unique_id.value;
778 if (info->valid & ACPI_VALID_CID)
779 cid_list = &info->compatibility_id;
780 if (info->valid & ACPI_VALID_ADR) {
781 device->pnp.bus_address = info->address;
782 device->flags.bus_address = 1;
785 if(!(info->valid & (ACPI_VALID_HID | ACPI_VALID_CID))){
786 status = acpi_video_bus_match(device);
787 if(ACPI_SUCCESS(status))
788 hid = ACPI_VIDEO_HID;
790 status = acpi_pci_bridge_match(device);
791 if(ACPI_SUCCESS(status))
792 hid = ACPI_PCI_BRIDGE_HID;
795 case ACPI_BUS_TYPE_POWER:
796 hid = ACPI_POWER_HID;
798 case ACPI_BUS_TYPE_PROCESSOR:
799 hid = ACPI_PROCESSOR_HID;
801 case ACPI_BUS_TYPE_SYSTEM:
802 hid = ACPI_SYSTEM_HID;
804 case ACPI_BUS_TYPE_THERMAL:
805 hid = ACPI_THERMAL_HID;
807 case ACPI_BUS_TYPE_POWER_BUTTON:
808 hid = ACPI_BUTTON_HID_POWERF;
810 case ACPI_BUS_TYPE_SLEEP_BUTTON:
811 hid = ACPI_BUTTON_HID_SLEEPF;
818 * Fix for the system root bus device -- the only root-level device.
820 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
822 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
823 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
827 strcpy(device->pnp.hardware_id, hid);
828 device->flags.hardware_id = 1;
831 strcpy(device->pnp.unique_id, uid);
832 device->flags.unique_id = 1;
835 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
836 if (device->pnp.cid_list)
837 memcpy(device->pnp.cid_list, cid_list, cid_list->size);
839 printk(KERN_ERR "Memory allocation error\n");
842 kfree(buffer.pointer);
845 static int acpi_device_set_context(struct acpi_device *device, int type)
847 acpi_status status = AE_OK;
852 * Attach this 'struct acpi_device' to the ACPI object. This makes
853 * resolutions from handle->device very efficient. Note that we need
854 * to be careful with fixed-feature devices as they all attach to the
857 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
858 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
859 status = acpi_attach_data(device->handle,
860 acpi_bus_data_handler, device);
862 if (ACPI_FAILURE(status)) {
863 printk("Error attaching device data\n");
870 static void acpi_device_get_debug_info(struct acpi_device *device,
871 acpi_handle handle, int type)
873 #ifdef CONFIG_ACPI_DEBUG_OUTPUT
874 char *type_string = NULL;
875 char name[80] = { '?', '\0' };
876 struct acpi_buffer buffer = { sizeof(name), name };
879 case ACPI_BUS_TYPE_DEVICE:
880 type_string = "Device";
881 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
883 case ACPI_BUS_TYPE_POWER:
884 type_string = "Power Resource";
885 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
887 case ACPI_BUS_TYPE_PROCESSOR:
888 type_string = "Processor";
889 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
891 case ACPI_BUS_TYPE_SYSTEM:
892 type_string = "System";
893 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
895 case ACPI_BUS_TYPE_THERMAL:
896 type_string = "Thermal Zone";
897 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
899 case ACPI_BUS_TYPE_POWER_BUTTON:
900 type_string = "Power Button";
901 sprintf(name, "PWRB");
903 case ACPI_BUS_TYPE_SLEEP_BUTTON:
904 type_string = "Sleep Button";
905 sprintf(name, "SLPB");
909 printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle);
910 #endif /*CONFIG_ACPI_DEBUG_OUTPUT */
913 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
918 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
919 device_release_driver(&dev->dev);
924 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
930 acpi_add_single_object(struct acpi_device **child,
931 struct acpi_device *parent, acpi_handle handle, int type,
932 struct acpi_bus_ops *ops)
935 struct acpi_device *device = NULL;
941 device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
943 printk(KERN_ERR PREFIX "Memory allocation error\n");
946 memset(device, 0, sizeof(struct acpi_device));
948 device->handle = handle;
949 device->parent = parent;
950 device->bus_ops = *ops; /* workround for not call .start */
953 acpi_device_get_busid(device, handle, type);
958 * Get prior to calling acpi_bus_get_status() so we know whether
959 * or not _STA is present. Note that we only look for object
960 * handles -- cannot evaluate objects until we know the device is
961 * present and properly initialized.
963 result = acpi_bus_get_flags(device);
970 * See if the device is present. We always assume that non-Device
971 * and non-Processor objects (e.g. thermal zones, power resources,
972 * etc.) are present, functioning, etc. (at least when parent object
973 * is present). Note that _STA has a different meaning for some
974 * objects (e.g. power resources) so we need to be careful how we use
978 case ACPI_BUS_TYPE_PROCESSOR:
979 case ACPI_BUS_TYPE_DEVICE:
980 result = acpi_bus_get_status(device);
981 if (ACPI_FAILURE(result) || !device->status.present) {
987 STRUCT_TO_INT(device->status) = 0x0F;
994 * TBD: Synch with Core's enumeration/initialization process.
998 * Hardware ID, Unique ID, & Bus Address
999 * -------------------------------------
1001 acpi_device_set_id(device, parent, handle, type);
1007 if (device->flags.power_manageable) {
1008 result = acpi_bus_get_power_flags(device);
1014 * Wakeup device management
1015 *-----------------------
1017 if (device->flags.wake_capable) {
1018 result = acpi_bus_get_wakeup_device_flags(device);
1024 * Performance Management
1025 * ----------------------
1027 if (device->flags.performance_manageable) {
1028 result = acpi_bus_get_perf_flags(device);
1033 if ((result = acpi_device_set_context(device, type)))
1036 acpi_device_get_debug_info(device, handle, type);
1038 acpi_device_register(device, parent);
1044 kfree(device->pnp.cid_list);
1051 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1053 acpi_status status = AE_OK;
1054 struct acpi_device *parent = NULL;
1055 struct acpi_device *child = NULL;
1056 acpi_handle phandle = NULL;
1057 acpi_handle chandle = NULL;
1058 acpi_object_type type = 0;
1066 phandle = start->handle;
1069 * Parse through the ACPI namespace, identify all 'devices', and
1070 * create a new 'struct acpi_device' for each.
1072 while ((level > 0) && parent) {
1074 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1078 * If this scope is exhausted then move our way back up.
1080 if (ACPI_FAILURE(status)) {
1083 acpi_get_parent(phandle, &phandle);
1085 parent = parent->parent;
1089 status = acpi_get_type(chandle, &type);
1090 if (ACPI_FAILURE(status))
1094 * If this is a scope object then parse it (depth-first).
1096 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1104 * We're only interested in objects that we consider 'devices'.
1107 case ACPI_TYPE_DEVICE:
1108 type = ACPI_BUS_TYPE_DEVICE;
1110 case ACPI_TYPE_PROCESSOR:
1111 type = ACPI_BUS_TYPE_PROCESSOR;
1113 case ACPI_TYPE_THERMAL:
1114 type = ACPI_BUS_TYPE_THERMAL;
1116 case ACPI_TYPE_POWER:
1117 type = ACPI_BUS_TYPE_POWER;
1123 if (ops->acpi_op_add)
1124 status = acpi_add_single_object(&child, parent,
1125 chandle, type, ops);
1127 status = acpi_bus_get_device(chandle, &child);
1129 if (ACPI_FAILURE(status))
1132 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1133 status = acpi_start_single_object(child);
1134 if (ACPI_FAILURE(status))
1139 * If the device is present, enabled, and functioning then
1140 * parse its scope (depth-first). Note that we need to
1141 * represent absent devices to facilitate PnP notifications
1142 * -- but only the subtree head (not all of its children,
1143 * which will be enumerated when the parent is inserted).
1145 * TBD: Need notifications and other detection mechanisms
1146 * in place before we can fully implement this.
1148 if (child->status.present) {
1149 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1151 if (ACPI_SUCCESS(status)) {
1164 acpi_bus_add(struct acpi_device **child,
1165 struct acpi_device *parent, acpi_handle handle, int type)
1168 struct acpi_bus_ops ops;
1170 memset(&ops, 0, sizeof(ops));
1171 ops.acpi_op_add = 1;
1173 result = acpi_add_single_object(child, parent, handle, type, &ops);
1175 result = acpi_bus_scan(*child, &ops);
1180 EXPORT_SYMBOL(acpi_bus_add);
1182 int acpi_bus_start(struct acpi_device *device)
1185 struct acpi_bus_ops ops;
1191 result = acpi_start_single_object(device);
1193 memset(&ops, 0, sizeof(ops));
1194 ops.acpi_op_start = 1;
1195 result = acpi_bus_scan(device, &ops);
1200 EXPORT_SYMBOL(acpi_bus_start);
1202 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1205 struct acpi_device *parent, *child;
1206 acpi_handle phandle, chandle;
1207 acpi_object_type type;
1212 phandle = start->handle;
1213 child = chandle = NULL;
1215 while ((level > 0) && parent && (!err)) {
1216 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1220 * If this scope is exhausted then move our way back up.
1222 if (ACPI_FAILURE(status)) {
1225 acpi_get_parent(phandle, &phandle);
1227 parent = parent->parent;
1230 err = acpi_bus_remove(child, rmdevice);
1232 err = acpi_bus_remove(child, 1);
1237 status = acpi_get_type(chandle, &type);
1238 if (ACPI_FAILURE(status)) {
1242 * If there is a device corresponding to chandle then
1243 * parse it (depth-first).
1245 if (acpi_bus_get_device(chandle, &child) == 0) {
1255 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1258 static int acpi_bus_scan_fixed(struct acpi_device *root)
1261 struct acpi_device *device = NULL;
1262 struct acpi_bus_ops ops;
1267 memset(&ops, 0, sizeof(ops));
1268 ops.acpi_op_add = 1;
1269 ops.acpi_op_start = 1;
1272 * Enumerate all fixed-feature devices.
1274 if (acpi_fadt.pwr_button == 0) {
1275 result = acpi_add_single_object(&device, acpi_root,
1277 ACPI_BUS_TYPE_POWER_BUTTON,
1281 if (acpi_fadt.sleep_button == 0) {
1282 result = acpi_add_single_object(&device, acpi_root,
1284 ACPI_BUS_TYPE_SLEEP_BUTTON,
1291 static int __init acpi_scan_init(void)
1294 struct acpi_bus_ops ops;
1300 memset(&ops, 0, sizeof(ops));
1301 ops.acpi_op_add = 1;
1302 ops.acpi_op_start = 1;
1304 result = bus_register(&acpi_bus_type);
1306 /* We don't want to quit even if we failed to add suspend/resume */
1307 printk(KERN_ERR PREFIX "Could not register bus type\n");
1311 * Create the root device in the bus's device tree
1313 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1314 ACPI_BUS_TYPE_SYSTEM, &ops);
1319 * Enumerate devices in the ACPI namespace.
1321 result = acpi_bus_scan_fixed(acpi_root);
1323 result = acpi_bus_scan(acpi_root, &ops);
1326 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1332 subsys_initcall(acpi_scan_init);