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>
9 #include <linux/signal.h>
10 #include <linux/kthread.h>
12 #include <acpi/acpi_drivers.h>
16 #define _COMPONENT ACPI_BUS_COMPONENT
17 ACPI_MODULE_NAME("scan");
18 #define STRUCT_TO_INT(s) (*((int*)&s))
19 extern struct acpi_device *acpi_root;
21 #define ACPI_BUS_CLASS "system_bus"
22 #define ACPI_BUS_HID "LNXSYBUS"
23 #define ACPI_BUS_DEVICE_NAME "System Bus"
25 static LIST_HEAD(acpi_device_list);
26 static LIST_HEAD(acpi_bus_id_list);
27 DEFINE_MUTEX(acpi_device_lock);
28 LIST_HEAD(acpi_wakeup_device_list);
30 struct acpi_device_bus_id{
32 unsigned int instance_no;
33 struct list_head node;
37 * Creates hid/cid(s) string needed for modalias and uevent
38 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
39 * char *modalias: "acpi:IBM0001:ACPI0001"
41 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
47 if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
50 len = snprintf(modalias, size, "acpi:");
53 if (acpi_dev->flags.hardware_id) {
54 count = snprintf(&modalias[len], size, "%s:",
55 acpi_dev->pnp.hardware_id);
56 if (count < 0 || count >= size)
62 if (acpi_dev->flags.compatible_ids) {
63 struct acpica_device_id_list *cid_list;
66 cid_list = acpi_dev->pnp.cid_list;
67 for (i = 0; i < cid_list->count; i++) {
68 count = snprintf(&modalias[len], size, "%s:",
69 cid_list->ids[i].string);
70 if (count < 0 || count >= size) {
71 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
72 acpi_dev->pnp.device_name, i);
85 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
86 struct acpi_device *acpi_dev = to_acpi_device(dev);
89 /* Device has no HID and no CID or string is >1024 */
90 len = create_modalias(acpi_dev, buf, 1024);
96 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
98 static void acpi_bus_hot_remove_device(void *context)
100 struct acpi_device *device;
101 acpi_handle handle = context;
102 struct acpi_object_list arg_list;
103 union acpi_object arg;
104 acpi_status status = AE_OK;
106 if (acpi_bus_get_device(handle, &device))
112 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
113 "Hot-removing device %s...\n", dev_name(&device->dev)));
115 if (acpi_bus_trim(device, 1)) {
116 printk(KERN_ERR PREFIX
117 "Removing device failed\n");
121 /* power off device */
122 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
123 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
124 printk(KERN_WARNING PREFIX
125 "Power-off device failed\n");
127 if (device->flags.lockable) {
129 arg_list.pointer = &arg;
130 arg.type = ACPI_TYPE_INTEGER;
131 arg.integer.value = 0;
132 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
136 arg_list.pointer = &arg;
137 arg.type = ACPI_TYPE_INTEGER;
138 arg.integer.value = 1;
143 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
144 if (ACPI_FAILURE(status))
145 printk(KERN_WARNING PREFIX
146 "Eject device failed\n");
152 acpi_eject_store(struct device *d, struct device_attribute *attr,
153 const char *buf, size_t count)
157 acpi_object_type type = 0;
158 struct acpi_device *acpi_device = to_acpi_device(d);
160 if ((!count) || (buf[0] != '1')) {
164 if (acpi_device->driver == NULL) {
169 status = acpi_get_type(acpi_device->handle, &type);
170 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
175 acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
180 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
183 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
184 struct acpi_device *acpi_dev = to_acpi_device(dev);
186 return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
188 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
191 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
192 struct acpi_device *acpi_dev = to_acpi_device(dev);
193 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
196 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
200 result = sprintf(buf, "%s\n", (char*)path.pointer);
205 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
207 static int acpi_device_setup_files(struct acpi_device *dev)
214 * Devices gotten from FADT don't have a "path" attribute
217 result = device_create_file(&dev->dev, &dev_attr_path);
222 if (dev->flags.hardware_id) {
223 result = device_create_file(&dev->dev, &dev_attr_hid);
228 if (dev->flags.hardware_id || dev->flags.compatible_ids) {
229 result = device_create_file(&dev->dev, &dev_attr_modalias);
235 * If device has _EJ0, 'eject' file is created that is used to trigger
236 * hot-removal function from userland.
238 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
239 if (ACPI_SUCCESS(status))
240 result = device_create_file(&dev->dev, &dev_attr_eject);
245 static void acpi_device_remove_files(struct acpi_device *dev)
251 * If device has _EJ0, 'eject' file is created that is used to trigger
252 * hot-removal function from userland.
254 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
255 if (ACPI_SUCCESS(status))
256 device_remove_file(&dev->dev, &dev_attr_eject);
258 if (dev->flags.hardware_id || dev->flags.compatible_ids)
259 device_remove_file(&dev->dev, &dev_attr_modalias);
261 if (dev->flags.hardware_id)
262 device_remove_file(&dev->dev, &dev_attr_hid);
264 device_remove_file(&dev->dev, &dev_attr_path);
266 /* --------------------------------------------------------------------------
268 -------------------------------------------------------------------------- */
270 int acpi_match_device_ids(struct acpi_device *device,
271 const struct acpi_device_id *ids)
273 const struct acpi_device_id *id;
276 * If the device is not present, it is unnecessary to load device
279 if (!device->status.present)
282 if (device->flags.hardware_id) {
283 for (id = ids; id->id[0]; id++) {
284 if (!strcmp((char*)id->id, device->pnp.hardware_id))
289 if (device->flags.compatible_ids) {
290 struct acpica_device_id_list *cid_list = device->pnp.cid_list;
293 for (id = ids; id->id[0]; id++) {
294 /* compare multiple _CID entries against driver ids */
295 for (i = 0; i < cid_list->count; i++) {
296 if (!strcmp((char*)id->id,
297 cid_list->ids[i].string))
305 EXPORT_SYMBOL(acpi_match_device_ids);
307 static void acpi_device_release(struct device *dev)
309 struct acpi_device *acpi_dev = to_acpi_device(dev);
311 kfree(acpi_dev->pnp.cid_list);
312 if (acpi_dev->flags.hardware_id)
313 kfree(acpi_dev->pnp.hardware_id);
314 if (acpi_dev->flags.unique_id)
315 kfree(acpi_dev->pnp.unique_id);
319 static int acpi_device_suspend(struct device *dev, pm_message_t state)
321 struct acpi_device *acpi_dev = to_acpi_device(dev);
322 struct acpi_driver *acpi_drv = acpi_dev->driver;
324 if (acpi_drv && acpi_drv->ops.suspend)
325 return acpi_drv->ops.suspend(acpi_dev, state);
329 static int acpi_device_resume(struct device *dev)
331 struct acpi_device *acpi_dev = to_acpi_device(dev);
332 struct acpi_driver *acpi_drv = acpi_dev->driver;
334 if (acpi_drv && acpi_drv->ops.resume)
335 return acpi_drv->ops.resume(acpi_dev);
339 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
341 struct acpi_device *acpi_dev = to_acpi_device(dev);
342 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
344 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
347 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
349 struct acpi_device *acpi_dev = to_acpi_device(dev);
352 if (add_uevent_var(env, "MODALIAS="))
354 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
355 sizeof(env->buf) - env->buflen);
356 if (len >= (sizeof(env->buf) - env->buflen))
362 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
364 struct acpi_device *device = data;
366 device->driver->ops.notify(device, event);
369 static acpi_status acpi_device_notify_fixed(void *data)
371 struct acpi_device *device = data;
373 acpi_device_notify(device->handle, ACPI_FIXED_HARDWARE_EVENT, device);
377 static int acpi_device_install_notify_handler(struct acpi_device *device)
382 hid = acpi_device_hid(device);
383 if (!strcmp(hid, ACPI_BUTTON_HID_POWERF))
385 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
386 acpi_device_notify_fixed,
388 else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEPF))
390 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
391 acpi_device_notify_fixed,
394 status = acpi_install_notify_handler(device->handle,
399 if (ACPI_FAILURE(status))
404 static void acpi_device_remove_notify_handler(struct acpi_device *device)
406 if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF))
407 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
408 acpi_device_notify_fixed);
409 else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF))
410 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
411 acpi_device_notify_fixed);
413 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
417 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
418 static int acpi_start_single_object(struct acpi_device *);
419 static int acpi_device_probe(struct device * dev)
421 struct acpi_device *acpi_dev = to_acpi_device(dev);
422 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
425 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
427 if (acpi_dev->bus_ops.acpi_op_start)
428 acpi_start_single_object(acpi_dev);
430 if (acpi_drv->ops.notify) {
431 ret = acpi_device_install_notify_handler(acpi_dev);
433 if (acpi_drv->ops.remove)
434 acpi_drv->ops.remove(acpi_dev,
435 acpi_dev->removal_type);
440 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
441 "Found driver [%s] for device [%s]\n",
442 acpi_drv->name, acpi_dev->pnp.bus_id));
448 static int acpi_device_remove(struct device * dev)
450 struct acpi_device *acpi_dev = to_acpi_device(dev);
451 struct acpi_driver *acpi_drv = acpi_dev->driver;
454 if (acpi_drv->ops.notify)
455 acpi_device_remove_notify_handler(acpi_dev);
456 if (acpi_drv->ops.remove)
457 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
459 acpi_dev->driver = NULL;
460 acpi_dev->driver_data = NULL;
466 struct bus_type acpi_bus_type = {
468 .suspend = acpi_device_suspend,
469 .resume = acpi_device_resume,
470 .match = acpi_bus_match,
471 .probe = acpi_device_probe,
472 .remove = acpi_device_remove,
473 .uevent = acpi_device_uevent,
476 static int acpi_device_register(struct acpi_device *device,
477 struct acpi_device *parent)
480 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
485 * Link this device to its parent and siblings.
487 INIT_LIST_HEAD(&device->children);
488 INIT_LIST_HEAD(&device->node);
489 INIT_LIST_HEAD(&device->wakeup_list);
491 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
493 printk(KERN_ERR PREFIX "Memory allocation error\n");
497 mutex_lock(&acpi_device_lock);
499 * Find suitable bus_id and instance number in acpi_bus_id_list
500 * If failed, create one and link it into acpi_bus_id_list
502 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
503 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
504 acpi_device_bus_id->instance_no ++;
511 acpi_device_bus_id = new_bus_id;
512 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
513 acpi_device_bus_id->instance_no = 0;
514 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
516 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
519 list_add_tail(&device->node, &device->parent->children);
521 if (device->wakeup.flags.valid)
522 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
523 mutex_unlock(&acpi_device_lock);
526 device->dev.parent = &parent->dev;
527 device->dev.bus = &acpi_bus_type;
528 device->dev.release = &acpi_device_release;
529 result = device_register(&device->dev);
531 dev_err(&device->dev, "Error registering device\n");
535 result = acpi_device_setup_files(device);
537 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
538 dev_name(&device->dev));
540 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
543 mutex_lock(&acpi_device_lock);
545 list_del(&device->node);
546 list_del(&device->wakeup_list);
547 mutex_unlock(&acpi_device_lock);
551 static void acpi_device_unregister(struct acpi_device *device, int type)
553 mutex_lock(&acpi_device_lock);
555 list_del(&device->node);
557 list_del(&device->wakeup_list);
558 mutex_unlock(&acpi_device_lock);
560 acpi_detach_data(device->handle, acpi_bus_data_handler);
562 acpi_device_remove_files(device);
563 device_unregister(&device->dev);
566 /* --------------------------------------------------------------------------
568 -------------------------------------------------------------------------- */
570 * acpi_bus_driver_init - add a device to a driver
571 * @device: the device to add and initialize
572 * @driver: driver for the device
574 * Used to initialize a device via its device driver. Called whenever a
575 * driver is bound to a device. Invokes the driver's add() ops.
578 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
582 if (!device || !driver)
585 if (!driver->ops.add)
588 result = driver->ops.add(device);
590 device->driver = NULL;
591 device->driver_data = NULL;
595 device->driver = driver;
598 * TBD - Configuration Management: Assign resources to device based
599 * upon possible configuration and currently allocated resources.
602 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
603 "Driver successfully bound to device\n"));
607 static int acpi_start_single_object(struct acpi_device *device)
610 struct acpi_driver *driver;
613 if (!(driver = device->driver))
616 if (driver->ops.start) {
617 result = driver->ops.start(device);
618 if (result && driver->ops.remove)
619 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
626 * acpi_bus_register_driver - register a driver with the ACPI bus
627 * @driver: driver being registered
629 * Registers a driver with the ACPI bus. Searches the namespace for all
630 * devices that match the driver's criteria and binds. Returns zero for
631 * success or a negative error status for failure.
633 int acpi_bus_register_driver(struct acpi_driver *driver)
639 driver->drv.name = driver->name;
640 driver->drv.bus = &acpi_bus_type;
641 driver->drv.owner = driver->owner;
643 ret = driver_register(&driver->drv);
647 EXPORT_SYMBOL(acpi_bus_register_driver);
650 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
651 * @driver: driver to unregister
653 * Unregisters a driver with the ACPI bus. Searches the namespace for all
654 * devices that match the driver's criteria and unbinds.
656 void acpi_bus_unregister_driver(struct acpi_driver *driver)
658 driver_unregister(&driver->drv);
661 EXPORT_SYMBOL(acpi_bus_unregister_driver);
663 /* --------------------------------------------------------------------------
665 -------------------------------------------------------------------------- */
667 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
671 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
672 union acpi_object *obj;
674 status = acpi_get_handle(handle, "_EJD", &tmp);
675 if (ACPI_FAILURE(status))
678 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
679 if (ACPI_SUCCESS(status)) {
680 obj = buffer.pointer;
681 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
683 kfree(buffer.pointer);
687 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
689 void acpi_bus_data_handler(acpi_handle handle, void *context)
697 static int acpi_bus_get_perf_flags(struct acpi_device *device)
699 device->performance.state = ACPI_STATE_UNKNOWN;
704 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
705 union acpi_object *package)
708 union acpi_object *element = NULL;
710 if (!device || !package || (package->package.count < 2))
711 return AE_BAD_PARAMETER;
713 element = &(package->package.elements[0]);
715 return AE_BAD_PARAMETER;
716 if (element->type == ACPI_TYPE_PACKAGE) {
717 if ((element->package.count < 2) ||
718 (element->package.elements[0].type !=
719 ACPI_TYPE_LOCAL_REFERENCE)
720 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
722 device->wakeup.gpe_device =
723 element->package.elements[0].reference.handle;
724 device->wakeup.gpe_number =
725 (u32) element->package.elements[1].integer.value;
726 } else if (element->type == ACPI_TYPE_INTEGER) {
727 device->wakeup.gpe_number = element->integer.value;
731 element = &(package->package.elements[1]);
732 if (element->type != ACPI_TYPE_INTEGER) {
735 device->wakeup.sleep_state = element->integer.value;
737 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
740 device->wakeup.resources.count = package->package.count - 2;
741 for (i = 0; i < device->wakeup.resources.count; i++) {
742 element = &(package->package.elements[i + 2]);
743 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
746 device->wakeup.resources.handles[i] = element->reference.handle;
752 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
754 acpi_status status = 0;
755 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
756 union acpi_object *package = NULL;
759 struct acpi_device_id button_device_ids[] = {
767 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
768 if (ACPI_FAILURE(status)) {
769 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
773 package = (union acpi_object *)buffer.pointer;
774 status = acpi_bus_extract_wakeup_device_power_package(device, package);
775 if (ACPI_FAILURE(status)) {
776 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
780 kfree(buffer.pointer);
782 device->wakeup.flags.valid = 1;
783 device->wakeup.prepare_count = 0;
784 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
785 * system for the ACPI device with the _PRW object.
786 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
787 * So it is necessary to call _DSW object first. Only when it is not
788 * present will the _PSW object used.
790 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
792 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
793 "error in _DSW or _PSW evaluation\n"));
795 /* Power button, Lid switch always enable wakeup */
796 if (!acpi_match_device_ids(device, button_device_ids))
797 device->wakeup.flags.run_wake = 1;
800 if (ACPI_FAILURE(status))
801 device->flags.wake_capable = 0;
805 static int acpi_bus_get_power_flags(struct acpi_device *device)
807 acpi_status status = 0;
808 acpi_handle handle = NULL;
813 * Power Management Flags
815 status = acpi_get_handle(device->handle, "_PSC", &handle);
816 if (ACPI_SUCCESS(status))
817 device->power.flags.explicit_get = 1;
818 status = acpi_get_handle(device->handle, "_IRC", &handle);
819 if (ACPI_SUCCESS(status))
820 device->power.flags.inrush_current = 1;
823 * Enumerate supported power management states
825 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
826 struct acpi_device_power_state *ps = &device->power.states[i];
827 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
829 /* Evaluate "_PRx" to se if power resources are referenced */
830 acpi_evaluate_reference(device->handle, object_name, NULL,
832 if (ps->resources.count) {
833 device->power.flags.power_resources = 1;
837 /* Evaluate "_PSx" to see if we can do explicit sets */
838 object_name[2] = 'S';
839 status = acpi_get_handle(device->handle, object_name, &handle);
840 if (ACPI_SUCCESS(status)) {
841 ps->flags.explicit_set = 1;
845 /* State is valid if we have some power control */
846 if (ps->resources.count || ps->flags.explicit_set)
849 ps->power = -1; /* Unknown - driver assigned */
850 ps->latency = -1; /* Unknown - driver assigned */
853 /* Set defaults for D0 and D3 states (always valid) */
854 device->power.states[ACPI_STATE_D0].flags.valid = 1;
855 device->power.states[ACPI_STATE_D0].power = 100;
856 device->power.states[ACPI_STATE_D3].flags.valid = 1;
857 device->power.states[ACPI_STATE_D3].power = 0;
859 /* TBD: System wake support and resource requirements. */
861 device->power.state = ACPI_STATE_UNKNOWN;
862 acpi_bus_get_power(device->handle, &(device->power.state));
867 static int acpi_bus_get_flags(struct acpi_device *device)
869 acpi_status status = AE_OK;
870 acpi_handle temp = NULL;
873 /* Presence of _STA indicates 'dynamic_status' */
874 status = acpi_get_handle(device->handle, "_STA", &temp);
875 if (ACPI_SUCCESS(status))
876 device->flags.dynamic_status = 1;
878 /* Presence of _CID indicates 'compatible_ids' */
879 status = acpi_get_handle(device->handle, "_CID", &temp);
880 if (ACPI_SUCCESS(status))
881 device->flags.compatible_ids = 1;
883 /* Presence of _RMV indicates 'removable' */
884 status = acpi_get_handle(device->handle, "_RMV", &temp);
885 if (ACPI_SUCCESS(status))
886 device->flags.removable = 1;
888 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
889 status = acpi_get_handle(device->handle, "_EJD", &temp);
890 if (ACPI_SUCCESS(status))
891 device->flags.ejectable = 1;
893 status = acpi_get_handle(device->handle, "_EJ0", &temp);
894 if (ACPI_SUCCESS(status))
895 device->flags.ejectable = 1;
898 /* Presence of _LCK indicates 'lockable' */
899 status = acpi_get_handle(device->handle, "_LCK", &temp);
900 if (ACPI_SUCCESS(status))
901 device->flags.lockable = 1;
903 /* Presence of _PS0|_PR0 indicates 'power manageable' */
904 status = acpi_get_handle(device->handle, "_PS0", &temp);
905 if (ACPI_FAILURE(status))
906 status = acpi_get_handle(device->handle, "_PR0", &temp);
907 if (ACPI_SUCCESS(status))
908 device->flags.power_manageable = 1;
910 /* Presence of _PRW indicates wake capable */
911 status = acpi_get_handle(device->handle, "_PRW", &temp);
912 if (ACPI_SUCCESS(status))
913 device->flags.wake_capable = 1;
915 /* TBD: Performance management */
920 static void acpi_device_get_busid(struct acpi_device *device,
921 acpi_handle handle, int type)
923 char bus_id[5] = { '?', 0 };
924 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
930 * The device's Bus ID is simply the object name.
931 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
934 case ACPI_BUS_TYPE_SYSTEM:
935 strcpy(device->pnp.bus_id, "ACPI");
937 case ACPI_BUS_TYPE_POWER_BUTTON:
938 strcpy(device->pnp.bus_id, "PWRF");
940 case ACPI_BUS_TYPE_SLEEP_BUTTON:
941 strcpy(device->pnp.bus_id, "SLPF");
944 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
945 /* Clean up trailing underscores (if any) */
946 for (i = 3; i > 1; i--) {
947 if (bus_id[i] == '_')
952 strcpy(device->pnp.bus_id, bus_id);
958 * acpi_bay_match - see if a device is an ejectable driver bay
960 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
961 * then we can safely call it an ejectable drive bay
963 static int acpi_bay_match(struct acpi_device *device){
969 handle = device->handle;
971 status = acpi_get_handle(handle, "_EJ0", &tmp);
972 if (ACPI_FAILURE(status))
975 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
976 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
977 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
978 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
981 if (acpi_get_parent(handle, &phandle))
984 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
985 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
986 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
987 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
994 * acpi_dock_match - see if a device has a _DCK method
996 static int acpi_dock_match(struct acpi_device *device)
999 return acpi_get_handle(device->handle, "_DCK", &tmp);
1002 static struct acpica_device_id_list*
1004 struct acpi_device_info *info,
1005 struct acpica_device_id *new_cid)
1007 struct acpica_device_id_list *cid;
1008 char *next_id_string;
1009 acpi_size cid_length;
1010 acpi_size new_cid_length;
1014 /* Allocate new CID list with room for the new CID */
1017 new_cid_length = info->compatible_id_list.list_size;
1018 else if (info->compatible_id_list.list_size)
1019 new_cid_length = info->compatible_id_list.list_size +
1020 new_cid->length + sizeof(struct acpica_device_id);
1022 new_cid_length = sizeof(struct acpica_device_id_list) + new_cid->length;
1024 cid = ACPI_ALLOCATE_ZEROED(new_cid_length);
1029 cid->list_size = new_cid_length;
1030 cid->count = info->compatible_id_list.count;
1033 next_id_string = (char *) cid->ids + (cid->count * sizeof(struct acpica_device_id));
1035 /* Copy all existing CIDs */
1037 for (i = 0; i < info->compatible_id_list.count; i++) {
1038 cid_length = info->compatible_id_list.ids[i].length;
1039 cid->ids[i].string = next_id_string;
1040 cid->ids[i].length = cid_length;
1042 ACPI_MEMCPY(next_id_string, info->compatible_id_list.ids[i].string,
1045 next_id_string += cid_length;
1048 /* Append the new CID */
1051 cid->ids[i].string = next_id_string;
1052 cid->ids[i].length = new_cid->length;
1054 ACPI_MEMCPY(next_id_string, new_cid->string, new_cid->length);
1060 static void acpi_device_set_id(struct acpi_device *device,
1061 struct acpi_device *parent, acpi_handle handle,
1064 struct acpi_device_info *info = NULL;
1067 struct acpica_device_id_list *cid_list = NULL;
1068 char *cid_add = NULL;
1072 case ACPI_BUS_TYPE_DEVICE:
1073 status = acpi_get_object_info(handle, &info);
1074 if (ACPI_FAILURE(status)) {
1075 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1079 if (info->valid & ACPI_VALID_HID)
1080 hid = info->hardware_id.string;
1081 if (info->valid & ACPI_VALID_UID)
1082 uid = info->unique_id.string;
1083 if (info->valid & ACPI_VALID_CID)
1084 cid_list = &info->compatible_id_list;
1085 if (info->valid & ACPI_VALID_ADR) {
1086 device->pnp.bus_address = info->address;
1087 device->flags.bus_address = 1;
1090 /* If we have a video/bay/dock device, add our selfdefined
1091 HID to the CID list. Like that the video/bay/dock drivers
1092 will get autoloaded and the device might still match
1093 against another driver.
1095 if (acpi_is_video_device(device))
1096 cid_add = ACPI_VIDEO_HID;
1097 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1098 cid_add = ACPI_BAY_HID;
1099 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1100 cid_add = ACPI_DOCK_HID;
1103 case ACPI_BUS_TYPE_POWER:
1104 hid = ACPI_POWER_HID;
1106 case ACPI_BUS_TYPE_PROCESSOR:
1107 hid = ACPI_PROCESSOR_OBJECT_HID;
1109 case ACPI_BUS_TYPE_SYSTEM:
1110 hid = ACPI_SYSTEM_HID;
1112 case ACPI_BUS_TYPE_THERMAL:
1113 hid = ACPI_THERMAL_HID;
1115 case ACPI_BUS_TYPE_POWER_BUTTON:
1116 hid = ACPI_BUTTON_HID_POWERF;
1118 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1119 hid = ACPI_BUTTON_HID_SLEEPF;
1126 * Fix for the system root bus device -- the only root-level device.
1128 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1130 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1131 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1135 device->pnp.hardware_id = ACPI_ALLOCATE_ZEROED(strlen (hid) + 1);
1136 if (device->pnp.hardware_id) {
1137 strcpy(device->pnp.hardware_id, hid);
1138 device->flags.hardware_id = 1;
1141 if (!device->flags.hardware_id)
1142 device->pnp.hardware_id = "";
1145 device->pnp.unique_id = ACPI_ALLOCATE_ZEROED(strlen (uid) + 1);
1146 if (device->pnp.unique_id) {
1147 strcpy(device->pnp.unique_id, uid);
1148 device->flags.unique_id = 1;
1151 if (!device->flags.unique_id)
1152 device->pnp.unique_id = "";
1154 if (cid_list || cid_add) {
1155 struct acpica_device_id_list *list;
1158 struct acpica_device_id cid;
1159 cid.length = strlen (cid_add) + 1;
1160 cid.string = cid_add;
1162 list = acpi_add_cid(info, &cid);
1164 list = acpi_add_cid(info, NULL);
1168 device->pnp.cid_list = list;
1170 device->flags.compatible_ids = 1;
1177 static int acpi_device_set_context(struct acpi_device *device, int type)
1179 acpi_status status = AE_OK;
1184 * Attach this 'struct acpi_device' to the ACPI object. This makes
1185 * resolutions from handle->device very efficient. Note that we need
1186 * to be careful with fixed-feature devices as they all attach to the
1189 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1190 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1191 status = acpi_attach_data(device->handle,
1192 acpi_bus_data_handler, device);
1194 if (ACPI_FAILURE(status)) {
1195 printk(KERN_ERR PREFIX "Error attaching device data\n");
1202 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1207 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1208 device_release_driver(&dev->dev);
1214 * unbind _ADR-Based Devices when hot removal
1216 if (dev->flags.bus_address) {
1217 if ((dev->parent) && (dev->parent->ops.unbind))
1218 dev->parent->ops.unbind(dev);
1220 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1226 acpi_add_single_object(struct acpi_device **child,
1227 struct acpi_device *parent, acpi_handle handle, int type,
1228 struct acpi_bus_ops *ops)
1231 struct acpi_device *device = NULL;
1237 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1239 printk(KERN_ERR PREFIX "Memory allocation error\n");
1243 device->handle = handle;
1244 device->parent = parent;
1245 device->bus_ops = *ops; /* workround for not call .start */
1248 acpi_device_get_busid(device, handle, type);
1253 * Get prior to calling acpi_bus_get_status() so we know whether
1254 * or not _STA is present. Note that we only look for object
1255 * handles -- cannot evaluate objects until we know the device is
1256 * present and properly initialized.
1258 result = acpi_bus_get_flags(device);
1265 * See if the device is present. We always assume that non-Device
1266 * and non-Processor objects (e.g. thermal zones, power resources,
1267 * etc.) are present, functioning, etc. (at least when parent object
1268 * is present). Note that _STA has a different meaning for some
1269 * objects (e.g. power resources) so we need to be careful how we use
1273 case ACPI_BUS_TYPE_PROCESSOR:
1274 case ACPI_BUS_TYPE_DEVICE:
1275 result = acpi_bus_get_status(device);
1276 if (ACPI_FAILURE(result)) {
1281 * When the device is neither present nor functional, the
1282 * device should not be added to Linux ACPI device tree.
1283 * When the status of the device is not present but functinal,
1284 * it should be added to Linux ACPI tree. For example : bay
1285 * device , dock device.
1286 * In such conditions it is unncessary to check whether it is
1287 * bay device or dock device.
1289 if (!device->status.present && !device->status.functional) {
1295 STRUCT_TO_INT(device->status) =
1296 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1297 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
1304 * TBD: Synch with Core's enumeration/initialization process.
1308 * Hardware ID, Unique ID, & Bus Address
1309 * -------------------------------------
1311 acpi_device_set_id(device, parent, handle, type);
1317 if (device->flags.power_manageable) {
1318 result = acpi_bus_get_power_flags(device);
1324 * Wakeup device management
1325 *-----------------------
1327 if (device->flags.wake_capable) {
1328 result = acpi_bus_get_wakeup_device_flags(device);
1334 * Performance Management
1335 * ----------------------
1337 if (device->flags.performance_manageable) {
1338 result = acpi_bus_get_perf_flags(device);
1343 if ((result = acpi_device_set_context(device, type)))
1346 result = acpi_device_register(device, parent);
1349 * Bind _ADR-Based Devices when hot add
1351 if (device->flags.bus_address) {
1352 if (device->parent && device->parent->ops.bind)
1353 device->parent->ops.bind(device);
1360 acpi_device_release(&device->dev);
1365 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1367 acpi_status status = AE_OK;
1368 struct acpi_device *parent = NULL;
1369 struct acpi_device *child = NULL;
1370 acpi_handle phandle = NULL;
1371 acpi_handle chandle = NULL;
1372 acpi_object_type type = 0;
1380 phandle = start->handle;
1383 * Parse through the ACPI namespace, identify all 'devices', and
1384 * create a new 'struct acpi_device' for each.
1386 while ((level > 0) && parent) {
1388 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1392 * If this scope is exhausted then move our way back up.
1394 if (ACPI_FAILURE(status)) {
1397 acpi_get_parent(phandle, &phandle);
1399 parent = parent->parent;
1403 status = acpi_get_type(chandle, &type);
1404 if (ACPI_FAILURE(status))
1408 * If this is a scope object then parse it (depth-first).
1410 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1418 * We're only interested in objects that we consider 'devices'.
1421 case ACPI_TYPE_DEVICE:
1422 type = ACPI_BUS_TYPE_DEVICE;
1424 case ACPI_TYPE_PROCESSOR:
1425 type = ACPI_BUS_TYPE_PROCESSOR;
1427 case ACPI_TYPE_THERMAL:
1428 type = ACPI_BUS_TYPE_THERMAL;
1430 case ACPI_TYPE_POWER:
1431 type = ACPI_BUS_TYPE_POWER;
1437 if (ops->acpi_op_add)
1438 status = acpi_add_single_object(&child, parent,
1439 chandle, type, ops);
1441 status = acpi_bus_get_device(chandle, &child);
1443 if (ACPI_FAILURE(status))
1446 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1447 status = acpi_start_single_object(child);
1448 if (ACPI_FAILURE(status))
1453 * If the device is present, enabled, and functioning then
1454 * parse its scope (depth-first). Note that we need to
1455 * represent absent devices to facilitate PnP notifications
1456 * -- but only the subtree head (not all of its children,
1457 * which will be enumerated when the parent is inserted).
1459 * TBD: Need notifications and other detection mechanisms
1460 * in place before we can fully implement this.
1463 * When the device is not present but functional, it is also
1464 * necessary to scan the children of this device.
1466 if (child->status.present || (!child->status.present &&
1467 child->status.functional)) {
1468 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1470 if (ACPI_SUCCESS(status)) {
1483 acpi_bus_add(struct acpi_device **child,
1484 struct acpi_device *parent, acpi_handle handle, int type)
1487 struct acpi_bus_ops ops;
1489 memset(&ops, 0, sizeof(ops));
1490 ops.acpi_op_add = 1;
1492 result = acpi_add_single_object(child, parent, handle, type, &ops);
1494 result = acpi_bus_scan(*child, &ops);
1498 EXPORT_SYMBOL(acpi_bus_add);
1500 int acpi_bus_start(struct acpi_device *device)
1503 struct acpi_bus_ops ops;
1509 result = acpi_start_single_object(device);
1511 memset(&ops, 0, sizeof(ops));
1512 ops.acpi_op_start = 1;
1513 result = acpi_bus_scan(device, &ops);
1517 EXPORT_SYMBOL(acpi_bus_start);
1519 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1522 struct acpi_device *parent, *child;
1523 acpi_handle phandle, chandle;
1524 acpi_object_type type;
1529 phandle = start->handle;
1530 child = chandle = NULL;
1532 while ((level > 0) && parent && (!err)) {
1533 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1537 * If this scope is exhausted then move our way back up.
1539 if (ACPI_FAILURE(status)) {
1542 acpi_get_parent(phandle, &phandle);
1544 parent = parent->parent;
1547 err = acpi_bus_remove(child, rmdevice);
1549 err = acpi_bus_remove(child, 1);
1554 status = acpi_get_type(chandle, &type);
1555 if (ACPI_FAILURE(status)) {
1559 * If there is a device corresponding to chandle then
1560 * parse it (depth-first).
1562 if (acpi_bus_get_device(chandle, &child) == 0) {
1572 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1574 static int acpi_bus_scan_fixed(struct acpi_device *root)
1577 struct acpi_device *device = NULL;
1578 struct acpi_bus_ops ops;
1583 memset(&ops, 0, sizeof(ops));
1584 ops.acpi_op_add = 1;
1585 ops.acpi_op_start = 1;
1588 * Enumerate all fixed-feature devices.
1590 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1591 result = acpi_add_single_object(&device, acpi_root,
1593 ACPI_BUS_TYPE_POWER_BUTTON,
1597 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1598 result = acpi_add_single_object(&device, acpi_root,
1600 ACPI_BUS_TYPE_SLEEP_BUTTON,
1607 int __init acpi_scan_init(void)
1610 struct acpi_bus_ops ops;
1612 memset(&ops, 0, sizeof(ops));
1613 ops.acpi_op_add = 1;
1614 ops.acpi_op_start = 1;
1616 result = bus_register(&acpi_bus_type);
1618 /* We don't want to quit even if we failed to add suspend/resume */
1619 printk(KERN_ERR PREFIX "Could not register bus type\n");
1623 * Create the root device in the bus's device tree
1625 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1626 ACPI_BUS_TYPE_SYSTEM, &ops);
1631 * Enumerate devices in the ACPI namespace.
1633 result = acpi_bus_scan_fixed(acpi_root);
1636 result = acpi_bus_scan(acpi_root, &ops);
1639 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);