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 if (acpi_drv->ops.match)
170 return !acpi_drv->ops.match(acpi_dev, acpi_drv);
171 return !acpi_match_ids(acpi_dev, acpi_drv->ids);
174 static int acpi_device_uevent(struct device *dev, char **envp, int num_envp,
175 char *buffer, int buffer_size)
177 struct acpi_device *acpi_dev = to_acpi_device(dev);
178 int i = 0, length = 0, ret = 0;
180 if (acpi_dev->flags.hardware_id)
181 ret = add_uevent_var(envp, num_envp, &i,
182 buffer, buffer_size, &length,
183 "HWID=%s", acpi_dev->pnp.hardware_id);
186 if (acpi_dev->flags.compatible_ids) {
188 struct acpi_compatible_id_list *cid_list;
190 cid_list = acpi_dev->pnp.cid_list;
192 for (j = 0; j < cid_list->count; j++) {
193 ret = add_uevent_var(envp, num_envp, &i, buffer,
194 buffer_size, &length, "COMPTID=%s",
195 cid_list->id[j].value);
205 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
206 static int acpi_start_single_object(struct acpi_device *);
207 static int acpi_device_probe(struct device * dev)
209 struct acpi_device *acpi_dev = to_acpi_device(dev);
210 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
213 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
215 if (acpi_dev->bus_ops.acpi_op_start)
216 acpi_start_single_object(acpi_dev);
217 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
218 "Found driver [%s] for device [%s]\n",
219 acpi_drv->name, acpi_dev->pnp.bus_id));
225 static int acpi_device_remove(struct device * dev)
227 struct acpi_device *acpi_dev = to_acpi_device(dev);
228 struct acpi_driver *acpi_drv = acpi_dev->driver;
231 if (acpi_drv->ops.stop)
232 acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
233 if (acpi_drv->ops.remove)
234 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
236 acpi_dev->driver = NULL;
237 acpi_driver_data(dev) = NULL;
243 static void acpi_device_shutdown(struct device *dev)
245 struct acpi_device *acpi_dev = to_acpi_device(dev);
246 struct acpi_driver *acpi_drv = acpi_dev->driver;
248 if (acpi_drv && acpi_drv->ops.shutdown)
249 acpi_drv->ops.shutdown(acpi_dev);
254 static struct bus_type acpi_bus_type = {
256 .suspend = acpi_device_suspend,
257 .resume = acpi_device_resume,
258 .shutdown = acpi_device_shutdown,
259 .match = acpi_bus_match,
260 .probe = acpi_device_probe,
261 .remove = acpi_device_remove,
262 .uevent = acpi_device_uevent,
265 static void acpi_device_register(struct acpi_device *device,
266 struct acpi_device *parent)
271 * Link this device to its parent and siblings.
273 INIT_LIST_HEAD(&device->children);
274 INIT_LIST_HEAD(&device->node);
275 INIT_LIST_HEAD(&device->g_list);
276 INIT_LIST_HEAD(&device->wakeup_list);
278 spin_lock(&acpi_device_lock);
279 if (device->parent) {
280 list_add_tail(&device->node, &device->parent->children);
281 list_add_tail(&device->g_list, &device->parent->g_list);
283 list_add_tail(&device->g_list, &acpi_device_list);
284 if (device->wakeup.flags.valid)
285 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
286 spin_unlock(&acpi_device_lock);
289 device->dev.parent = &parent->dev;
290 device->dev.bus = &acpi_bus_type;
291 device_initialize(&device->dev);
292 sprintf(device->dev.bus_id, "%s", device->pnp.bus_id);
293 device->dev.release = &acpi_device_release;
294 device_add(&device->dev);
296 acpi_device_setup_files(device);
297 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
300 static void acpi_device_unregister(struct acpi_device *device, int type)
302 spin_lock(&acpi_device_lock);
303 if (device->parent) {
304 list_del(&device->node);
305 list_del(&device->g_list);
307 list_del(&device->g_list);
309 list_del(&device->wakeup_list);
310 spin_unlock(&acpi_device_lock);
312 acpi_detach_data(device->handle, acpi_bus_data_handler);
314 acpi_device_remove_files(device);
315 device_unregister(&device->dev);
318 /* --------------------------------------------------------------------------
320 -------------------------------------------------------------------------- */
322 * acpi_bus_driver_init - add a device to a driver
323 * @device: the device to add and initialize
324 * @driver: driver for the device
326 * Used to initialize a device via its device driver. Called whenever a
327 * driver is bound to a device. Invokes the driver's add() ops.
330 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
335 if (!device || !driver)
338 if (!driver->ops.add)
341 result = driver->ops.add(device);
343 device->driver = NULL;
344 acpi_driver_data(device) = NULL;
348 device->driver = driver;
351 * TBD - Configuration Management: Assign resources to device based
352 * upon possible configuration and currently allocated resources.
355 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
356 "Driver successfully bound to device\n"));
360 static int acpi_start_single_object(struct acpi_device *device)
363 struct acpi_driver *driver;
366 if (!(driver = device->driver))
369 if (driver->ops.start) {
370 result = driver->ops.start(device);
371 if (result && driver->ops.remove)
372 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
379 * acpi_bus_register_driver - register a driver with the ACPI bus
380 * @driver: driver being registered
382 * Registers a driver with the ACPI bus. Searches the namespace for all
383 * devices that match the driver's criteria and binds. Returns zero for
384 * success or a negative error status for failure.
386 int acpi_bus_register_driver(struct acpi_driver *driver)
392 driver->drv.name = driver->name;
393 driver->drv.bus = &acpi_bus_type;
394 driver->drv.owner = driver->owner;
396 ret = driver_register(&driver->drv);
400 EXPORT_SYMBOL(acpi_bus_register_driver);
403 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
404 * @driver: driver to unregister
406 * Unregisters a driver with the ACPI bus. Searches the namespace for all
407 * devices that match the driver's criteria and unbinds.
409 void acpi_bus_unregister_driver(struct acpi_driver *driver)
411 driver_unregister(&driver->drv);
414 EXPORT_SYMBOL(acpi_bus_unregister_driver);
416 /* --------------------------------------------------------------------------
418 -------------------------------------------------------------------------- */
420 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
424 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
425 union acpi_object *obj;
427 status = acpi_get_handle(handle, "_EJD", &tmp);
428 if (ACPI_FAILURE(status))
431 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
432 if (ACPI_SUCCESS(status)) {
433 obj = buffer.pointer;
434 status = acpi_get_handle(NULL, obj->string.pointer, ejd);
435 kfree(buffer.pointer);
439 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
441 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
449 int acpi_match_ids(struct acpi_device *device, char *ids)
451 if (device->flags.hardware_id)
452 if (strstr(ids, device->pnp.hardware_id))
455 if (device->flags.compatible_ids) {
456 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
459 /* compare multiple _CID entries against driver ids */
460 for (i = 0; i < cid_list->count; i++) {
461 if (strstr(ids, cid_list->id[i].value))
468 static int acpi_bus_get_perf_flags(struct acpi_device *device)
470 device->performance.state = ACPI_STATE_UNKNOWN;
475 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
476 union acpi_object *package)
479 union acpi_object *element = NULL;
481 if (!device || !package || (package->package.count < 2))
482 return AE_BAD_PARAMETER;
484 element = &(package->package.elements[0]);
486 return AE_BAD_PARAMETER;
487 if (element->type == ACPI_TYPE_PACKAGE) {
488 if ((element->package.count < 2) ||
489 (element->package.elements[0].type !=
490 ACPI_TYPE_LOCAL_REFERENCE)
491 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
493 device->wakeup.gpe_device =
494 element->package.elements[0].reference.handle;
495 device->wakeup.gpe_number =
496 (u32) element->package.elements[1].integer.value;
497 } else if (element->type == ACPI_TYPE_INTEGER) {
498 device->wakeup.gpe_number = element->integer.value;
502 element = &(package->package.elements[1]);
503 if (element->type != ACPI_TYPE_INTEGER) {
506 device->wakeup.sleep_state = element->integer.value;
508 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
511 device->wakeup.resources.count = package->package.count - 2;
512 for (i = 0; i < device->wakeup.resources.count; i++) {
513 element = &(package->package.elements[i + 2]);
514 if (element->type != ACPI_TYPE_ANY) {
518 device->wakeup.resources.handles[i] = element->reference.handle;
524 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
526 acpi_status status = 0;
527 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
528 union acpi_object *package = NULL;
532 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
533 if (ACPI_FAILURE(status)) {
534 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
538 package = (union acpi_object *)buffer.pointer;
539 status = acpi_bus_extract_wakeup_device_power_package(device, package);
540 if (ACPI_FAILURE(status)) {
541 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
545 kfree(buffer.pointer);
547 device->wakeup.flags.valid = 1;
548 /* Power button, Lid switch always enable wakeup */
549 if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E"))
550 device->wakeup.flags.run_wake = 1;
553 if (ACPI_FAILURE(status))
554 device->flags.wake_capable = 0;
558 static int acpi_bus_get_power_flags(struct acpi_device *device)
560 acpi_status status = 0;
561 acpi_handle handle = NULL;
566 * Power Management Flags
568 status = acpi_get_handle(device->handle, "_PSC", &handle);
569 if (ACPI_SUCCESS(status))
570 device->power.flags.explicit_get = 1;
571 status = acpi_get_handle(device->handle, "_IRC", &handle);
572 if (ACPI_SUCCESS(status))
573 device->power.flags.inrush_current = 1;
576 * Enumerate supported power management states
578 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
579 struct acpi_device_power_state *ps = &device->power.states[i];
580 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
582 /* Evaluate "_PRx" to se if power resources are referenced */
583 acpi_evaluate_reference(device->handle, object_name, NULL,
585 if (ps->resources.count) {
586 device->power.flags.power_resources = 1;
590 /* Evaluate "_PSx" to see if we can do explicit sets */
591 object_name[2] = 'S';
592 status = acpi_get_handle(device->handle, object_name, &handle);
593 if (ACPI_SUCCESS(status)) {
594 ps->flags.explicit_set = 1;
598 /* State is valid if we have some power control */
599 if (ps->resources.count || ps->flags.explicit_set)
602 ps->power = -1; /* Unknown - driver assigned */
603 ps->latency = -1; /* Unknown - driver assigned */
606 /* Set defaults for D0 and D3 states (always valid) */
607 device->power.states[ACPI_STATE_D0].flags.valid = 1;
608 device->power.states[ACPI_STATE_D0].power = 100;
609 device->power.states[ACPI_STATE_D3].flags.valid = 1;
610 device->power.states[ACPI_STATE_D3].power = 0;
612 /* TBD: System wake support and resource requirements. */
614 device->power.state = ACPI_STATE_UNKNOWN;
619 static int acpi_bus_get_flags(struct acpi_device *device)
621 acpi_status status = AE_OK;
622 acpi_handle temp = NULL;
625 /* Presence of _STA indicates 'dynamic_status' */
626 status = acpi_get_handle(device->handle, "_STA", &temp);
627 if (ACPI_SUCCESS(status))
628 device->flags.dynamic_status = 1;
630 /* Presence of _CID indicates 'compatible_ids' */
631 status = acpi_get_handle(device->handle, "_CID", &temp);
632 if (ACPI_SUCCESS(status))
633 device->flags.compatible_ids = 1;
635 /* Presence of _RMV indicates 'removable' */
636 status = acpi_get_handle(device->handle, "_RMV", &temp);
637 if (ACPI_SUCCESS(status))
638 device->flags.removable = 1;
640 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
641 status = acpi_get_handle(device->handle, "_EJD", &temp);
642 if (ACPI_SUCCESS(status))
643 device->flags.ejectable = 1;
645 status = acpi_get_handle(device->handle, "_EJ0", &temp);
646 if (ACPI_SUCCESS(status))
647 device->flags.ejectable = 1;
650 /* Presence of _LCK indicates 'lockable' */
651 status = acpi_get_handle(device->handle, "_LCK", &temp);
652 if (ACPI_SUCCESS(status))
653 device->flags.lockable = 1;
655 /* Presence of _PS0|_PR0 indicates 'power manageable' */
656 status = acpi_get_handle(device->handle, "_PS0", &temp);
657 if (ACPI_FAILURE(status))
658 status = acpi_get_handle(device->handle, "_PR0", &temp);
659 if (ACPI_SUCCESS(status))
660 device->flags.power_manageable = 1;
662 /* Presence of _PRW indicates wake capable */
663 status = acpi_get_handle(device->handle, "_PRW", &temp);
664 if (ACPI_SUCCESS(status))
665 device->flags.wake_capable = 1;
667 /* TBD: Peformance management */
672 static void acpi_device_get_busid(struct acpi_device *device,
673 acpi_handle handle, int type)
675 char bus_id[5] = { '?', 0 };
676 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
682 * The device's Bus ID is simply the object name.
683 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
686 case ACPI_BUS_TYPE_SYSTEM:
687 strcpy(device->pnp.bus_id, "ACPI");
689 case ACPI_BUS_TYPE_POWER_BUTTON:
690 strcpy(device->pnp.bus_id, "PWRF");
692 case ACPI_BUS_TYPE_SLEEP_BUTTON:
693 strcpy(device->pnp.bus_id, "SLPF");
696 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
697 /* Clean up trailing underscores (if any) */
698 for (i = 3; i > 1; i--) {
699 if (bus_id[i] == '_')
704 strcpy(device->pnp.bus_id, bus_id);
709 static void acpi_device_set_id(struct acpi_device *device,
710 struct acpi_device *parent, acpi_handle handle,
713 struct acpi_device_info *info;
714 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
717 struct acpi_compatible_id_list *cid_list = NULL;
721 case ACPI_BUS_TYPE_DEVICE:
722 status = acpi_get_object_info(handle, &buffer);
723 if (ACPI_FAILURE(status)) {
724 printk("%s: Error reading device info\n", __FUNCTION__);
728 info = buffer.pointer;
729 if (info->valid & ACPI_VALID_HID)
730 hid = info->hardware_id.value;
731 if (info->valid & ACPI_VALID_UID)
732 uid = info->unique_id.value;
733 if (info->valid & ACPI_VALID_CID)
734 cid_list = &info->compatibility_id;
735 if (info->valid & ACPI_VALID_ADR) {
736 device->pnp.bus_address = info->address;
737 device->flags.bus_address = 1;
740 case ACPI_BUS_TYPE_POWER:
741 hid = ACPI_POWER_HID;
743 case ACPI_BUS_TYPE_PROCESSOR:
744 hid = ACPI_PROCESSOR_HID;
746 case ACPI_BUS_TYPE_SYSTEM:
747 hid = ACPI_SYSTEM_HID;
749 case ACPI_BUS_TYPE_THERMAL:
750 hid = ACPI_THERMAL_HID;
752 case ACPI_BUS_TYPE_POWER_BUTTON:
753 hid = ACPI_BUTTON_HID_POWERF;
755 case ACPI_BUS_TYPE_SLEEP_BUTTON:
756 hid = ACPI_BUTTON_HID_SLEEPF;
763 * Fix for the system root bus device -- the only root-level device.
765 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
767 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
768 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
772 strcpy(device->pnp.hardware_id, hid);
773 device->flags.hardware_id = 1;
776 strcpy(device->pnp.unique_id, uid);
777 device->flags.unique_id = 1;
780 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
781 if (device->pnp.cid_list)
782 memcpy(device->pnp.cid_list, cid_list, cid_list->size);
784 printk(KERN_ERR "Memory allocation error\n");
787 kfree(buffer.pointer);
790 static int acpi_device_set_context(struct acpi_device *device, int type)
792 acpi_status status = AE_OK;
797 * Attach this 'struct acpi_device' to the ACPI object. This makes
798 * resolutions from handle->device very efficient. Note that we need
799 * to be careful with fixed-feature devices as they all attach to the
802 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
803 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
804 status = acpi_attach_data(device->handle,
805 acpi_bus_data_handler, device);
807 if (ACPI_FAILURE(status)) {
808 printk("Error attaching device data\n");
815 static void acpi_device_get_debug_info(struct acpi_device *device,
816 acpi_handle handle, int type)
818 #ifdef CONFIG_ACPI_DEBUG_OUTPUT
819 char *type_string = NULL;
820 char name[80] = { '?', '\0' };
821 struct acpi_buffer buffer = { sizeof(name), name };
824 case ACPI_BUS_TYPE_DEVICE:
825 type_string = "Device";
826 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
828 case ACPI_BUS_TYPE_POWER:
829 type_string = "Power Resource";
830 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
832 case ACPI_BUS_TYPE_PROCESSOR:
833 type_string = "Processor";
834 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
836 case ACPI_BUS_TYPE_SYSTEM:
837 type_string = "System";
838 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
840 case ACPI_BUS_TYPE_THERMAL:
841 type_string = "Thermal Zone";
842 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
844 case ACPI_BUS_TYPE_POWER_BUTTON:
845 type_string = "Power Button";
846 sprintf(name, "PWRB");
848 case ACPI_BUS_TYPE_SLEEP_BUTTON:
849 type_string = "Sleep Button";
850 sprintf(name, "SLPB");
854 printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle);
855 #endif /*CONFIG_ACPI_DEBUG_OUTPUT */
858 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
863 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
864 device_release_driver(&dev->dev);
869 if (dev->flags.bus_address) {
870 if ((dev->parent) && (dev->parent->ops.unbind))
871 dev->parent->ops.unbind(dev);
874 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
880 acpi_add_single_object(struct acpi_device **child,
881 struct acpi_device *parent, acpi_handle handle, int type,
882 struct acpi_bus_ops *ops)
885 struct acpi_device *device = NULL;
891 device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
893 printk(KERN_ERR PREFIX "Memory allocation error\n");
896 memset(device, 0, sizeof(struct acpi_device));
898 device->handle = handle;
899 device->parent = parent;
900 device->bus_ops = *ops; /* workround for not call .start */
903 acpi_device_get_busid(device, handle, type);
908 * Get prior to calling acpi_bus_get_status() so we know whether
909 * or not _STA is present. Note that we only look for object
910 * handles -- cannot evaluate objects until we know the device is
911 * present and properly initialized.
913 result = acpi_bus_get_flags(device);
920 * See if the device is present. We always assume that non-Device
921 * and non-Processor objects (e.g. thermal zones, power resources,
922 * etc.) are present, functioning, etc. (at least when parent object
923 * is present). Note that _STA has a different meaning for some
924 * objects (e.g. power resources) so we need to be careful how we use
928 case ACPI_BUS_TYPE_PROCESSOR:
929 case ACPI_BUS_TYPE_DEVICE:
930 result = acpi_bus_get_status(device);
931 if (ACPI_FAILURE(result) || !device->status.present) {
937 STRUCT_TO_INT(device->status) = 0x0F;
944 * TBD: Synch with Core's enumeration/initialization process.
948 * Hardware ID, Unique ID, & Bus Address
949 * -------------------------------------
951 acpi_device_set_id(device, parent, handle, type);
957 if (device->flags.power_manageable) {
958 result = acpi_bus_get_power_flags(device);
964 * Wakeup device management
965 *-----------------------
967 if (device->flags.wake_capable) {
968 result = acpi_bus_get_wakeup_device_flags(device);
974 * Performance Management
975 * ----------------------
977 if (device->flags.performance_manageable) {
978 result = acpi_bus_get_perf_flags(device);
983 if ((result = acpi_device_set_context(device, type)))
986 acpi_device_get_debug_info(device, handle, type);
988 acpi_device_register(device, parent);
991 * Bind _ADR-Based Devices
992 * -----------------------
993 * If there's a a bus address (_ADR) then we utilize the parent's
994 * 'bind' function (if exists) to bind the ACPI- and natively-
995 * enumerated device representations.
997 if (device->flags.bus_address) {
998 if (device->parent && device->parent->ops.bind)
999 device->parent->ops.bind(device);
1006 kfree(device->pnp.cid_list);
1013 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1015 acpi_status status = AE_OK;
1016 struct acpi_device *parent = NULL;
1017 struct acpi_device *child = NULL;
1018 acpi_handle phandle = NULL;
1019 acpi_handle chandle = NULL;
1020 acpi_object_type type = 0;
1028 phandle = start->handle;
1031 * Parse through the ACPI namespace, identify all 'devices', and
1032 * create a new 'struct acpi_device' for each.
1034 while ((level > 0) && parent) {
1036 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1040 * If this scope is exhausted then move our way back up.
1042 if (ACPI_FAILURE(status)) {
1045 acpi_get_parent(phandle, &phandle);
1047 parent = parent->parent;
1051 status = acpi_get_type(chandle, &type);
1052 if (ACPI_FAILURE(status))
1056 * If this is a scope object then parse it (depth-first).
1058 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1066 * We're only interested in objects that we consider 'devices'.
1069 case ACPI_TYPE_DEVICE:
1070 type = ACPI_BUS_TYPE_DEVICE;
1072 case ACPI_TYPE_PROCESSOR:
1073 type = ACPI_BUS_TYPE_PROCESSOR;
1075 case ACPI_TYPE_THERMAL:
1076 type = ACPI_BUS_TYPE_THERMAL;
1078 case ACPI_TYPE_POWER:
1079 type = ACPI_BUS_TYPE_POWER;
1085 if (ops->acpi_op_add)
1086 status = acpi_add_single_object(&child, parent,
1087 chandle, type, ops);
1089 status = acpi_bus_get_device(chandle, &child);
1091 if (ACPI_FAILURE(status))
1094 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1095 status = acpi_start_single_object(child);
1096 if (ACPI_FAILURE(status))
1101 * If the device is present, enabled, and functioning then
1102 * parse its scope (depth-first). Note that we need to
1103 * represent absent devices to facilitate PnP notifications
1104 * -- but only the subtree head (not all of its children,
1105 * which will be enumerated when the parent is inserted).
1107 * TBD: Need notifications and other detection mechanisms
1108 * in place before we can fully implement this.
1110 if (child->status.present) {
1111 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1113 if (ACPI_SUCCESS(status)) {
1126 acpi_bus_add(struct acpi_device **child,
1127 struct acpi_device *parent, acpi_handle handle, int type)
1130 struct acpi_bus_ops ops;
1132 memset(&ops, 0, sizeof(ops));
1133 ops.acpi_op_add = 1;
1135 result = acpi_add_single_object(child, parent, handle, type, &ops);
1137 result = acpi_bus_scan(*child, &ops);
1142 EXPORT_SYMBOL(acpi_bus_add);
1144 int acpi_bus_start(struct acpi_device *device)
1147 struct acpi_bus_ops ops;
1153 result = acpi_start_single_object(device);
1155 memset(&ops, 0, sizeof(ops));
1156 ops.acpi_op_start = 1;
1157 result = acpi_bus_scan(device, &ops);
1162 EXPORT_SYMBOL(acpi_bus_start);
1164 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1167 struct acpi_device *parent, *child;
1168 acpi_handle phandle, chandle;
1169 acpi_object_type type;
1174 phandle = start->handle;
1175 child = chandle = NULL;
1177 while ((level > 0) && parent && (!err)) {
1178 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1182 * If this scope is exhausted then move our way back up.
1184 if (ACPI_FAILURE(status)) {
1187 acpi_get_parent(phandle, &phandle);
1189 parent = parent->parent;
1192 err = acpi_bus_remove(child, rmdevice);
1194 err = acpi_bus_remove(child, 1);
1199 status = acpi_get_type(chandle, &type);
1200 if (ACPI_FAILURE(status)) {
1204 * If there is a device corresponding to chandle then
1205 * parse it (depth-first).
1207 if (acpi_bus_get_device(chandle, &child) == 0) {
1217 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1220 static int acpi_bus_scan_fixed(struct acpi_device *root)
1223 struct acpi_device *device = NULL;
1224 struct acpi_bus_ops ops;
1229 memset(&ops, 0, sizeof(ops));
1230 ops.acpi_op_add = 1;
1231 ops.acpi_op_start = 1;
1234 * Enumerate all fixed-feature devices.
1236 if (acpi_fadt.pwr_button == 0) {
1237 result = acpi_add_single_object(&device, acpi_root,
1239 ACPI_BUS_TYPE_POWER_BUTTON,
1243 if (acpi_fadt.sleep_button == 0) {
1244 result = acpi_add_single_object(&device, acpi_root,
1246 ACPI_BUS_TYPE_SLEEP_BUTTON,
1253 static int __init acpi_scan_init(void)
1256 struct acpi_bus_ops ops;
1262 memset(&ops, 0, sizeof(ops));
1263 ops.acpi_op_add = 1;
1264 ops.acpi_op_start = 1;
1266 result = bus_register(&acpi_bus_type);
1268 /* We don't want to quit even if we failed to add suspend/resume */
1269 printk(KERN_ERR PREFIX "Could not register bus type\n");
1273 * Create the root device in the bus's device tree
1275 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1276 ACPI_BUS_TYPE_SYSTEM, &ops);
1281 * Enumerate devices in the ACPI namespace.
1283 result = acpi_bus_scan_fixed(acpi_root);
1285 result = acpi_bus_scan(acpi_root, &ops);
1288 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1294 subsys_initcall(acpi_scan_init);