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 /* Fixed hardware devices have no handles */
374 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
378 static int acpi_device_install_notify_handler(struct acpi_device *device)
382 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
384 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
385 acpi_device_notify_fixed,
387 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
389 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
390 acpi_device_notify_fixed,
393 status = acpi_install_notify_handler(device->handle,
398 if (ACPI_FAILURE(status))
403 static void acpi_device_remove_notify_handler(struct acpi_device *device)
405 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
406 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
407 acpi_device_notify_fixed);
408 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
409 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
410 acpi_device_notify_fixed);
412 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
416 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
417 static int acpi_start_single_object(struct acpi_device *);
418 static int acpi_device_probe(struct device * dev)
420 struct acpi_device *acpi_dev = to_acpi_device(dev);
421 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
424 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
426 if (acpi_dev->bus_ops.acpi_op_start)
427 acpi_start_single_object(acpi_dev);
429 if (acpi_drv->ops.notify) {
430 ret = acpi_device_install_notify_handler(acpi_dev);
432 if (acpi_drv->ops.remove)
433 acpi_drv->ops.remove(acpi_dev,
434 acpi_dev->removal_type);
439 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
440 "Found driver [%s] for device [%s]\n",
441 acpi_drv->name, acpi_dev->pnp.bus_id));
447 static int acpi_device_remove(struct device * dev)
449 struct acpi_device *acpi_dev = to_acpi_device(dev);
450 struct acpi_driver *acpi_drv = acpi_dev->driver;
453 if (acpi_drv->ops.notify)
454 acpi_device_remove_notify_handler(acpi_dev);
455 if (acpi_drv->ops.remove)
456 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
458 acpi_dev->driver = NULL;
459 acpi_dev->driver_data = NULL;
465 struct bus_type acpi_bus_type = {
467 .suspend = acpi_device_suspend,
468 .resume = acpi_device_resume,
469 .match = acpi_bus_match,
470 .probe = acpi_device_probe,
471 .remove = acpi_device_remove,
472 .uevent = acpi_device_uevent,
475 static int acpi_device_register(struct acpi_device *device)
478 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
484 * Link this device to its parent and siblings.
486 INIT_LIST_HEAD(&device->children);
487 INIT_LIST_HEAD(&device->node);
488 INIT_LIST_HEAD(&device->wakeup_list);
490 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
492 printk(KERN_ERR PREFIX "Memory allocation error\n");
496 mutex_lock(&acpi_device_lock);
498 * Find suitable bus_id and instance number in acpi_bus_id_list
499 * If failed, create one and link it into acpi_bus_id_list
501 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
502 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
503 acpi_device_bus_id->instance_no ++;
510 acpi_device_bus_id = new_bus_id;
511 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
512 acpi_device_bus_id->instance_no = 0;
513 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
515 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
518 list_add_tail(&device->node, &device->parent->children);
520 if (device->wakeup.flags.valid)
521 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
522 mutex_unlock(&acpi_device_lock);
525 device->dev.parent = &device->parent->dev;
526 device->dev.bus = &acpi_bus_type;
527 device->dev.release = &acpi_device_release;
528 result = device_register(&device->dev);
530 dev_err(&device->dev, "Error registering device\n");
534 result = acpi_device_setup_files(device);
536 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
537 dev_name(&device->dev));
539 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
542 mutex_lock(&acpi_device_lock);
544 list_del(&device->node);
545 list_del(&device->wakeup_list);
546 mutex_unlock(&acpi_device_lock);
550 static void acpi_device_unregister(struct acpi_device *device, int type)
552 mutex_lock(&acpi_device_lock);
554 list_del(&device->node);
556 list_del(&device->wakeup_list);
557 mutex_unlock(&acpi_device_lock);
559 acpi_detach_data(device->handle, acpi_bus_data_handler);
561 acpi_device_remove_files(device);
562 device_unregister(&device->dev);
565 /* --------------------------------------------------------------------------
567 -------------------------------------------------------------------------- */
569 * acpi_bus_driver_init - add a device to a driver
570 * @device: the device to add and initialize
571 * @driver: driver for the device
573 * Used to initialize a device via its device driver. Called whenever a
574 * driver is bound to a device. Invokes the driver's add() ops.
577 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
581 if (!device || !driver)
584 if (!driver->ops.add)
587 result = driver->ops.add(device);
589 device->driver = NULL;
590 device->driver_data = NULL;
594 device->driver = driver;
597 * TBD - Configuration Management: Assign resources to device based
598 * upon possible configuration and currently allocated resources.
601 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
602 "Driver successfully bound to device\n"));
606 static int acpi_start_single_object(struct acpi_device *device)
609 struct acpi_driver *driver;
612 if (!(driver = device->driver))
615 if (driver->ops.start) {
616 result = driver->ops.start(device);
617 if (result && driver->ops.remove)
618 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
625 * acpi_bus_register_driver - register a driver with the ACPI bus
626 * @driver: driver being registered
628 * Registers a driver with the ACPI bus. Searches the namespace for all
629 * devices that match the driver's criteria and binds. Returns zero for
630 * success or a negative error status for failure.
632 int acpi_bus_register_driver(struct acpi_driver *driver)
638 driver->drv.name = driver->name;
639 driver->drv.bus = &acpi_bus_type;
640 driver->drv.owner = driver->owner;
642 ret = driver_register(&driver->drv);
646 EXPORT_SYMBOL(acpi_bus_register_driver);
649 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
650 * @driver: driver to unregister
652 * Unregisters a driver with the ACPI bus. Searches the namespace for all
653 * devices that match the driver's criteria and unbinds.
655 void acpi_bus_unregister_driver(struct acpi_driver *driver)
657 driver_unregister(&driver->drv);
660 EXPORT_SYMBOL(acpi_bus_unregister_driver);
662 /* --------------------------------------------------------------------------
664 -------------------------------------------------------------------------- */
666 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
670 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
671 union acpi_object *obj;
673 status = acpi_get_handle(handle, "_EJD", &tmp);
674 if (ACPI_FAILURE(status))
677 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
678 if (ACPI_SUCCESS(status)) {
679 obj = buffer.pointer;
680 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
682 kfree(buffer.pointer);
686 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
688 void acpi_bus_data_handler(acpi_handle handle, void *context)
696 static int acpi_bus_get_perf_flags(struct acpi_device *device)
698 device->performance.state = ACPI_STATE_UNKNOWN;
703 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
704 union acpi_object *package)
707 union acpi_object *element = NULL;
709 if (!device || !package || (package->package.count < 2))
710 return AE_BAD_PARAMETER;
712 element = &(package->package.elements[0]);
714 return AE_BAD_PARAMETER;
715 if (element->type == ACPI_TYPE_PACKAGE) {
716 if ((element->package.count < 2) ||
717 (element->package.elements[0].type !=
718 ACPI_TYPE_LOCAL_REFERENCE)
719 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
721 device->wakeup.gpe_device =
722 element->package.elements[0].reference.handle;
723 device->wakeup.gpe_number =
724 (u32) element->package.elements[1].integer.value;
725 } else if (element->type == ACPI_TYPE_INTEGER) {
726 device->wakeup.gpe_number = element->integer.value;
730 element = &(package->package.elements[1]);
731 if (element->type != ACPI_TYPE_INTEGER) {
734 device->wakeup.sleep_state = element->integer.value;
736 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
739 device->wakeup.resources.count = package->package.count - 2;
740 for (i = 0; i < device->wakeup.resources.count; i++) {
741 element = &(package->package.elements[i + 2]);
742 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
745 device->wakeup.resources.handles[i] = element->reference.handle;
751 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
753 acpi_status status = 0;
754 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
755 union acpi_object *package = NULL;
758 struct acpi_device_id button_device_ids[] = {
766 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
767 if (ACPI_FAILURE(status)) {
768 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
772 package = (union acpi_object *)buffer.pointer;
773 status = acpi_bus_extract_wakeup_device_power_package(device, package);
774 if (ACPI_FAILURE(status)) {
775 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
779 kfree(buffer.pointer);
781 device->wakeup.flags.valid = 1;
782 device->wakeup.prepare_count = 0;
783 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
784 * system for the ACPI device with the _PRW object.
785 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
786 * So it is necessary to call _DSW object first. Only when it is not
787 * present will the _PSW object used.
789 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
791 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
792 "error in _DSW or _PSW evaluation\n"));
794 /* Power button, Lid switch always enable wakeup */
795 if (!acpi_match_device_ids(device, button_device_ids))
796 device->wakeup.flags.run_wake = 1;
799 if (ACPI_FAILURE(status))
800 device->flags.wake_capable = 0;
804 static int acpi_bus_get_power_flags(struct acpi_device *device)
806 acpi_status status = 0;
807 acpi_handle handle = NULL;
812 * Power Management Flags
814 status = acpi_get_handle(device->handle, "_PSC", &handle);
815 if (ACPI_SUCCESS(status))
816 device->power.flags.explicit_get = 1;
817 status = acpi_get_handle(device->handle, "_IRC", &handle);
818 if (ACPI_SUCCESS(status))
819 device->power.flags.inrush_current = 1;
822 * Enumerate supported power management states
824 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
825 struct acpi_device_power_state *ps = &device->power.states[i];
826 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
828 /* Evaluate "_PRx" to se if power resources are referenced */
829 acpi_evaluate_reference(device->handle, object_name, NULL,
831 if (ps->resources.count) {
832 device->power.flags.power_resources = 1;
836 /* Evaluate "_PSx" to see if we can do explicit sets */
837 object_name[2] = 'S';
838 status = acpi_get_handle(device->handle, object_name, &handle);
839 if (ACPI_SUCCESS(status)) {
840 ps->flags.explicit_set = 1;
844 /* State is valid if we have some power control */
845 if (ps->resources.count || ps->flags.explicit_set)
848 ps->power = -1; /* Unknown - driver assigned */
849 ps->latency = -1; /* Unknown - driver assigned */
852 /* Set defaults for D0 and D3 states (always valid) */
853 device->power.states[ACPI_STATE_D0].flags.valid = 1;
854 device->power.states[ACPI_STATE_D0].power = 100;
855 device->power.states[ACPI_STATE_D3].flags.valid = 1;
856 device->power.states[ACPI_STATE_D3].power = 0;
858 /* TBD: System wake support and resource requirements. */
860 device->power.state = ACPI_STATE_UNKNOWN;
861 acpi_bus_get_power(device->handle, &(device->power.state));
866 static int acpi_bus_get_flags(struct acpi_device *device)
868 acpi_status status = AE_OK;
869 acpi_handle temp = NULL;
872 /* Presence of _STA indicates 'dynamic_status' */
873 status = acpi_get_handle(device->handle, "_STA", &temp);
874 if (ACPI_SUCCESS(status))
875 device->flags.dynamic_status = 1;
877 /* Presence of _CID indicates 'compatible_ids' */
878 status = acpi_get_handle(device->handle, "_CID", &temp);
879 if (ACPI_SUCCESS(status))
880 device->flags.compatible_ids = 1;
882 /* Presence of _RMV indicates 'removable' */
883 status = acpi_get_handle(device->handle, "_RMV", &temp);
884 if (ACPI_SUCCESS(status))
885 device->flags.removable = 1;
887 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
888 status = acpi_get_handle(device->handle, "_EJD", &temp);
889 if (ACPI_SUCCESS(status))
890 device->flags.ejectable = 1;
892 status = acpi_get_handle(device->handle, "_EJ0", &temp);
893 if (ACPI_SUCCESS(status))
894 device->flags.ejectable = 1;
897 /* Presence of _LCK indicates 'lockable' */
898 status = acpi_get_handle(device->handle, "_LCK", &temp);
899 if (ACPI_SUCCESS(status))
900 device->flags.lockable = 1;
902 /* Presence of _PS0|_PR0 indicates 'power manageable' */
903 status = acpi_get_handle(device->handle, "_PS0", &temp);
904 if (ACPI_FAILURE(status))
905 status = acpi_get_handle(device->handle, "_PR0", &temp);
906 if (ACPI_SUCCESS(status))
907 device->flags.power_manageable = 1;
909 /* Presence of _PRW indicates wake capable */
910 status = acpi_get_handle(device->handle, "_PRW", &temp);
911 if (ACPI_SUCCESS(status))
912 device->flags.wake_capable = 1;
914 /* TBD: Performance management */
919 static void acpi_device_get_busid(struct acpi_device *device)
921 char bus_id[5] = { '?', 0 };
922 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
928 * The device's Bus ID is simply the object name.
929 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
931 switch (device->device_type) {
932 case ACPI_BUS_TYPE_SYSTEM:
933 strcpy(device->pnp.bus_id, "ACPI");
935 case ACPI_BUS_TYPE_POWER_BUTTON:
936 strcpy(device->pnp.bus_id, "PWRF");
938 case ACPI_BUS_TYPE_SLEEP_BUTTON:
939 strcpy(device->pnp.bus_id, "SLPF");
942 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
943 /* Clean up trailing underscores (if any) */
944 for (i = 3; i > 1; i--) {
945 if (bus_id[i] == '_')
950 strcpy(device->pnp.bus_id, bus_id);
956 * acpi_bay_match - see if a device is an ejectable driver bay
958 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
959 * then we can safely call it an ejectable drive bay
961 static int acpi_bay_match(struct acpi_device *device){
967 handle = device->handle;
969 status = acpi_get_handle(handle, "_EJ0", &tmp);
970 if (ACPI_FAILURE(status))
973 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
974 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
975 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
976 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
979 if (acpi_get_parent(handle, &phandle))
982 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
983 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
984 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
985 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
992 * acpi_dock_match - see if a device has a _DCK method
994 static int acpi_dock_match(struct acpi_device *device)
997 return acpi_get_handle(device->handle, "_DCK", &tmp);
1000 static struct acpica_device_id_list*
1002 struct acpi_device_info *info,
1003 struct acpica_device_id *new_cid)
1005 struct acpica_device_id_list *cid;
1006 char *next_id_string;
1007 acpi_size cid_length;
1008 acpi_size new_cid_length;
1012 /* Allocate new CID list with room for the new CID */
1015 new_cid_length = info->compatible_id_list.list_size;
1016 else if (info->compatible_id_list.list_size)
1017 new_cid_length = info->compatible_id_list.list_size +
1018 new_cid->length + sizeof(struct acpica_device_id);
1020 new_cid_length = sizeof(struct acpica_device_id_list) + new_cid->length;
1022 cid = ACPI_ALLOCATE_ZEROED(new_cid_length);
1027 cid->list_size = new_cid_length;
1028 cid->count = info->compatible_id_list.count;
1031 next_id_string = (char *) cid->ids + (cid->count * sizeof(struct acpica_device_id));
1033 /* Copy all existing CIDs */
1035 for (i = 0; i < info->compatible_id_list.count; i++) {
1036 cid_length = info->compatible_id_list.ids[i].length;
1037 cid->ids[i].string = next_id_string;
1038 cid->ids[i].length = cid_length;
1040 ACPI_MEMCPY(next_id_string, info->compatible_id_list.ids[i].string,
1043 next_id_string += cid_length;
1046 /* Append the new CID */
1049 cid->ids[i].string = next_id_string;
1050 cid->ids[i].length = new_cid->length;
1052 ACPI_MEMCPY(next_id_string, new_cid->string, new_cid->length);
1058 static void acpi_device_set_id(struct acpi_device *device)
1060 struct acpi_device_info *info = NULL;
1063 struct acpica_device_id_list *cid_list = NULL;
1064 char *cid_add = NULL;
1067 switch (device->device_type) {
1068 case ACPI_BUS_TYPE_DEVICE:
1069 status = acpi_get_object_info(device->handle, &info);
1070 if (ACPI_FAILURE(status)) {
1071 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1075 if (info->valid & ACPI_VALID_HID)
1076 hid = info->hardware_id.string;
1077 if (info->valid & ACPI_VALID_UID)
1078 uid = info->unique_id.string;
1079 if (info->valid & ACPI_VALID_CID)
1080 cid_list = &info->compatible_id_list;
1081 if (info->valid & ACPI_VALID_ADR) {
1082 device->pnp.bus_address = info->address;
1083 device->flags.bus_address = 1;
1086 /* If we have a video/bay/dock device, add our selfdefined
1087 HID to the CID list. Like that the video/bay/dock drivers
1088 will get autoloaded and the device might still match
1089 against another driver.
1091 if (acpi_is_video_device(device))
1092 cid_add = ACPI_VIDEO_HID;
1093 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1094 cid_add = ACPI_BAY_HID;
1095 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1096 cid_add = ACPI_DOCK_HID;
1099 case ACPI_BUS_TYPE_POWER:
1100 hid = ACPI_POWER_HID;
1102 case ACPI_BUS_TYPE_PROCESSOR:
1103 hid = ACPI_PROCESSOR_OBJECT_HID;
1105 case ACPI_BUS_TYPE_SYSTEM:
1106 hid = ACPI_SYSTEM_HID;
1108 case ACPI_BUS_TYPE_THERMAL:
1109 hid = ACPI_THERMAL_HID;
1111 case ACPI_BUS_TYPE_POWER_BUTTON:
1112 hid = ACPI_BUTTON_HID_POWERF;
1114 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1115 hid = ACPI_BUTTON_HID_SLEEPF;
1122 * Fix for the system root bus device -- the only root-level device.
1124 if (((acpi_handle)device->parent == ACPI_ROOT_OBJECT) &&
1125 (device->device_type == ACPI_BUS_TYPE_DEVICE)) {
1127 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1128 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1132 device->pnp.hardware_id = ACPI_ALLOCATE_ZEROED(strlen (hid) + 1);
1133 if (device->pnp.hardware_id) {
1134 strcpy(device->pnp.hardware_id, hid);
1135 device->flags.hardware_id = 1;
1138 if (!device->flags.hardware_id)
1139 device->pnp.hardware_id = "";
1142 device->pnp.unique_id = ACPI_ALLOCATE_ZEROED(strlen (uid) + 1);
1143 if (device->pnp.unique_id) {
1144 strcpy(device->pnp.unique_id, uid);
1145 device->flags.unique_id = 1;
1148 if (!device->flags.unique_id)
1149 device->pnp.unique_id = "";
1151 if (cid_list || cid_add) {
1152 struct acpica_device_id_list *list;
1155 struct acpica_device_id cid;
1156 cid.length = strlen (cid_add) + 1;
1157 cid.string = cid_add;
1159 list = acpi_add_cid(info, &cid);
1161 list = acpi_add_cid(info, NULL);
1165 device->pnp.cid_list = list;
1167 device->flags.compatible_ids = 1;
1174 static int acpi_device_set_context(struct acpi_device *device)
1181 * Attach this 'struct acpi_device' to the ACPI object. This makes
1182 * resolutions from handle->device very efficient. Fixed hardware
1183 * devices have no handles, so we skip them.
1185 if (!device->handle)
1188 status = acpi_attach_data(device->handle,
1189 acpi_bus_data_handler, device);
1190 if (ACPI_SUCCESS(status))
1193 printk(KERN_ERR PREFIX "Error attaching device data\n");
1197 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1202 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1203 device_release_driver(&dev->dev);
1209 * unbind _ADR-Based Devices when hot removal
1211 if (dev->flags.bus_address) {
1212 if ((dev->parent) && (dev->parent->ops.unbind))
1213 dev->parent->ops.unbind(dev);
1215 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1221 acpi_add_single_object(struct acpi_device **child,
1222 struct acpi_device *parent, acpi_handle handle, int type,
1223 struct acpi_bus_ops *ops)
1226 struct acpi_device *device = NULL;
1227 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1233 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1235 printk(KERN_ERR PREFIX "Memory allocation error\n");
1239 device->device_type = type;
1240 device->handle = handle;
1241 device->parent = parent;
1242 device->bus_ops = *ops; /* workround for not call .start */
1244 acpi_device_get_busid(device);
1249 * Get prior to calling acpi_bus_get_status() so we know whether
1250 * or not _STA is present. Note that we only look for object
1251 * handles -- cannot evaluate objects until we know the device is
1252 * present and properly initialized.
1254 result = acpi_bus_get_flags(device);
1261 * See if the device is present. We always assume that non-Device
1262 * and non-Processor objects (e.g. thermal zones, power resources,
1263 * etc.) are present, functioning, etc. (at least when parent object
1264 * is present). Note that _STA has a different meaning for some
1265 * objects (e.g. power resources) so we need to be careful how we use
1269 case ACPI_BUS_TYPE_PROCESSOR:
1270 case ACPI_BUS_TYPE_DEVICE:
1271 result = acpi_bus_get_status(device);
1272 if (ACPI_FAILURE(result)) {
1277 * When the device is neither present nor functional, the
1278 * device should not be added to Linux ACPI device tree.
1279 * When the status of the device is not present but functinal,
1280 * it should be added to Linux ACPI tree. For example : bay
1281 * device , dock device.
1282 * In such conditions it is unncessary to check whether it is
1283 * bay device or dock device.
1285 if (!device->status.present && !device->status.functional) {
1291 STRUCT_TO_INT(device->status) =
1292 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1293 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
1300 * TBD: Synch with Core's enumeration/initialization process.
1304 * Hardware ID, Unique ID, & Bus Address
1305 * -------------------------------------
1307 acpi_device_set_id(device);
1313 if (device->flags.power_manageable) {
1314 result = acpi_bus_get_power_flags(device);
1320 * Wakeup device management
1321 *-----------------------
1323 if (device->flags.wake_capable) {
1324 result = acpi_bus_get_wakeup_device_flags(device);
1330 * Performance Management
1331 * ----------------------
1333 if (device->flags.performance_manageable) {
1334 result = acpi_bus_get_perf_flags(device);
1339 if ((result = acpi_device_set_context(device)))
1342 result = acpi_device_register(device);
1345 * Bind _ADR-Based Devices when hot add
1347 if (device->flags.bus_address) {
1348 if (device->parent && device->parent->ops.bind)
1349 device->parent->ops.bind(device);
1354 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1355 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1356 "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1357 (char *) buffer.pointer,
1358 device->parent ? dev_name(&device->parent->dev) :
1360 kfree(buffer.pointer);
1363 acpi_device_release(&device->dev);
1368 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1370 acpi_status status = AE_OK;
1371 struct acpi_device *parent = NULL;
1372 struct acpi_device *child = NULL;
1373 acpi_handle phandle = NULL;
1374 acpi_handle chandle = NULL;
1375 acpi_object_type type = 0;
1383 phandle = start->handle;
1386 * Parse through the ACPI namespace, identify all 'devices', and
1387 * create a new 'struct acpi_device' for each.
1389 while ((level > 0) && parent) {
1391 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1395 * If this scope is exhausted then move our way back up.
1397 if (ACPI_FAILURE(status)) {
1400 acpi_get_parent(phandle, &phandle);
1402 parent = parent->parent;
1406 status = acpi_get_type(chandle, &type);
1407 if (ACPI_FAILURE(status))
1411 * If this is a scope object then parse it (depth-first).
1413 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1421 * We're only interested in objects that we consider 'devices'.
1424 case ACPI_TYPE_DEVICE:
1425 type = ACPI_BUS_TYPE_DEVICE;
1427 case ACPI_TYPE_PROCESSOR:
1428 type = ACPI_BUS_TYPE_PROCESSOR;
1430 case ACPI_TYPE_THERMAL:
1431 type = ACPI_BUS_TYPE_THERMAL;
1433 case ACPI_TYPE_POWER:
1434 type = ACPI_BUS_TYPE_POWER;
1440 if (ops->acpi_op_add)
1441 status = acpi_add_single_object(&child, parent,
1442 chandle, type, ops);
1444 status = acpi_bus_get_device(chandle, &child);
1446 if (ACPI_FAILURE(status))
1449 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1450 status = acpi_start_single_object(child);
1451 if (ACPI_FAILURE(status))
1456 * If the device is present, enabled, and functioning then
1457 * parse its scope (depth-first). Note that we need to
1458 * represent absent devices to facilitate PnP notifications
1459 * -- but only the subtree head (not all of its children,
1460 * which will be enumerated when the parent is inserted).
1462 * TBD: Need notifications and other detection mechanisms
1463 * in place before we can fully implement this.
1466 * When the device is not present but functional, it is also
1467 * necessary to scan the children of this device.
1469 if (child->status.present || (!child->status.present &&
1470 child->status.functional)) {
1471 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1473 if (ACPI_SUCCESS(status)) {
1486 acpi_bus_add(struct acpi_device **child,
1487 struct acpi_device *parent, acpi_handle handle, int type)
1490 struct acpi_bus_ops ops;
1492 memset(&ops, 0, sizeof(ops));
1493 ops.acpi_op_add = 1;
1495 result = acpi_add_single_object(child, parent, handle, type, &ops);
1497 result = acpi_bus_scan(*child, &ops);
1501 EXPORT_SYMBOL(acpi_bus_add);
1503 int acpi_bus_start(struct acpi_device *device)
1506 struct acpi_bus_ops ops;
1512 result = acpi_start_single_object(device);
1514 memset(&ops, 0, sizeof(ops));
1515 ops.acpi_op_start = 1;
1516 result = acpi_bus_scan(device, &ops);
1520 EXPORT_SYMBOL(acpi_bus_start);
1522 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1525 struct acpi_device *parent, *child;
1526 acpi_handle phandle, chandle;
1527 acpi_object_type type;
1532 phandle = start->handle;
1533 child = chandle = NULL;
1535 while ((level > 0) && parent && (!err)) {
1536 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1540 * If this scope is exhausted then move our way back up.
1542 if (ACPI_FAILURE(status)) {
1545 acpi_get_parent(phandle, &phandle);
1547 parent = parent->parent;
1550 err = acpi_bus_remove(child, rmdevice);
1552 err = acpi_bus_remove(child, 1);
1557 status = acpi_get_type(chandle, &type);
1558 if (ACPI_FAILURE(status)) {
1562 * If there is a device corresponding to chandle then
1563 * parse it (depth-first).
1565 if (acpi_bus_get_device(chandle, &child) == 0) {
1575 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1577 static int acpi_bus_scan_fixed(void)
1580 struct acpi_device *device = NULL;
1581 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();
1636 result = acpi_bus_scan(acpi_root, &ops);
1639 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);