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 -------------------------------------------------------------------------- */
665 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
669 struct acpi_device *device;
672 * Fixed hardware devices do not appear in the namespace and do not
673 * have handles, but we fabricate acpi_devices for them, so we have
674 * to deal with them specially.
680 status = acpi_get_parent(handle, &handle);
681 if (status == AE_NULL_ENTRY)
683 if (ACPI_FAILURE(status))
686 ret = acpi_bus_get_device(handle, &device);
693 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
697 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
698 union acpi_object *obj;
700 status = acpi_get_handle(handle, "_EJD", &tmp);
701 if (ACPI_FAILURE(status))
704 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
705 if (ACPI_SUCCESS(status)) {
706 obj = buffer.pointer;
707 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
709 kfree(buffer.pointer);
713 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
715 void acpi_bus_data_handler(acpi_handle handle, void *context)
723 static int acpi_bus_get_perf_flags(struct acpi_device *device)
725 device->performance.state = ACPI_STATE_UNKNOWN;
730 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
731 union acpi_object *package)
734 union acpi_object *element = NULL;
736 if (!device || !package || (package->package.count < 2))
737 return AE_BAD_PARAMETER;
739 element = &(package->package.elements[0]);
741 return AE_BAD_PARAMETER;
742 if (element->type == ACPI_TYPE_PACKAGE) {
743 if ((element->package.count < 2) ||
744 (element->package.elements[0].type !=
745 ACPI_TYPE_LOCAL_REFERENCE)
746 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
748 device->wakeup.gpe_device =
749 element->package.elements[0].reference.handle;
750 device->wakeup.gpe_number =
751 (u32) element->package.elements[1].integer.value;
752 } else if (element->type == ACPI_TYPE_INTEGER) {
753 device->wakeup.gpe_number = element->integer.value;
757 element = &(package->package.elements[1]);
758 if (element->type != ACPI_TYPE_INTEGER) {
761 device->wakeup.sleep_state = element->integer.value;
763 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
766 device->wakeup.resources.count = package->package.count - 2;
767 for (i = 0; i < device->wakeup.resources.count; i++) {
768 element = &(package->package.elements[i + 2]);
769 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
772 device->wakeup.resources.handles[i] = element->reference.handle;
778 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
780 acpi_status status = 0;
781 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
782 union acpi_object *package = NULL;
785 struct acpi_device_id button_device_ids[] = {
793 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
794 if (ACPI_FAILURE(status)) {
795 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
799 package = (union acpi_object *)buffer.pointer;
800 status = acpi_bus_extract_wakeup_device_power_package(device, package);
801 if (ACPI_FAILURE(status)) {
802 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
806 kfree(buffer.pointer);
808 device->wakeup.flags.valid = 1;
809 device->wakeup.prepare_count = 0;
810 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
811 * system for the ACPI device with the _PRW object.
812 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
813 * So it is necessary to call _DSW object first. Only when it is not
814 * present will the _PSW object used.
816 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
818 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
819 "error in _DSW or _PSW evaluation\n"));
821 /* Power button, Lid switch always enable wakeup */
822 if (!acpi_match_device_ids(device, button_device_ids))
823 device->wakeup.flags.run_wake = 1;
826 if (ACPI_FAILURE(status))
827 device->flags.wake_capable = 0;
831 static int acpi_bus_get_power_flags(struct acpi_device *device)
833 acpi_status status = 0;
834 acpi_handle handle = NULL;
839 * Power Management Flags
841 status = acpi_get_handle(device->handle, "_PSC", &handle);
842 if (ACPI_SUCCESS(status))
843 device->power.flags.explicit_get = 1;
844 status = acpi_get_handle(device->handle, "_IRC", &handle);
845 if (ACPI_SUCCESS(status))
846 device->power.flags.inrush_current = 1;
849 * Enumerate supported power management states
851 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
852 struct acpi_device_power_state *ps = &device->power.states[i];
853 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
855 /* Evaluate "_PRx" to se if power resources are referenced */
856 acpi_evaluate_reference(device->handle, object_name, NULL,
858 if (ps->resources.count) {
859 device->power.flags.power_resources = 1;
863 /* Evaluate "_PSx" to see if we can do explicit sets */
864 object_name[2] = 'S';
865 status = acpi_get_handle(device->handle, object_name, &handle);
866 if (ACPI_SUCCESS(status)) {
867 ps->flags.explicit_set = 1;
871 /* State is valid if we have some power control */
872 if (ps->resources.count || ps->flags.explicit_set)
875 ps->power = -1; /* Unknown - driver assigned */
876 ps->latency = -1; /* Unknown - driver assigned */
879 /* Set defaults for D0 and D3 states (always valid) */
880 device->power.states[ACPI_STATE_D0].flags.valid = 1;
881 device->power.states[ACPI_STATE_D0].power = 100;
882 device->power.states[ACPI_STATE_D3].flags.valid = 1;
883 device->power.states[ACPI_STATE_D3].power = 0;
885 /* TBD: System wake support and resource requirements. */
887 device->power.state = ACPI_STATE_UNKNOWN;
888 acpi_bus_get_power(device->handle, &(device->power.state));
893 static int acpi_bus_get_flags(struct acpi_device *device)
895 acpi_status status = AE_OK;
896 acpi_handle temp = NULL;
899 /* Presence of _STA indicates 'dynamic_status' */
900 status = acpi_get_handle(device->handle, "_STA", &temp);
901 if (ACPI_SUCCESS(status))
902 device->flags.dynamic_status = 1;
904 /* Presence of _CID indicates 'compatible_ids' */
905 status = acpi_get_handle(device->handle, "_CID", &temp);
906 if (ACPI_SUCCESS(status))
907 device->flags.compatible_ids = 1;
909 /* Presence of _RMV indicates 'removable' */
910 status = acpi_get_handle(device->handle, "_RMV", &temp);
911 if (ACPI_SUCCESS(status))
912 device->flags.removable = 1;
914 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
915 status = acpi_get_handle(device->handle, "_EJD", &temp);
916 if (ACPI_SUCCESS(status))
917 device->flags.ejectable = 1;
919 status = acpi_get_handle(device->handle, "_EJ0", &temp);
920 if (ACPI_SUCCESS(status))
921 device->flags.ejectable = 1;
924 /* Presence of _LCK indicates 'lockable' */
925 status = acpi_get_handle(device->handle, "_LCK", &temp);
926 if (ACPI_SUCCESS(status))
927 device->flags.lockable = 1;
929 /* Presence of _PS0|_PR0 indicates 'power manageable' */
930 status = acpi_get_handle(device->handle, "_PS0", &temp);
931 if (ACPI_FAILURE(status))
932 status = acpi_get_handle(device->handle, "_PR0", &temp);
933 if (ACPI_SUCCESS(status))
934 device->flags.power_manageable = 1;
936 /* Presence of _PRW indicates wake capable */
937 status = acpi_get_handle(device->handle, "_PRW", &temp);
938 if (ACPI_SUCCESS(status))
939 device->flags.wake_capable = 1;
941 /* TBD: Performance management */
946 static void acpi_device_get_busid(struct acpi_device *device)
948 char bus_id[5] = { '?', 0 };
949 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
955 * The device's Bus ID is simply the object name.
956 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
958 switch (device->device_type) {
959 case ACPI_BUS_TYPE_SYSTEM:
960 strcpy(device->pnp.bus_id, "ACPI");
962 case ACPI_BUS_TYPE_POWER_BUTTON:
963 strcpy(device->pnp.bus_id, "PWRF");
965 case ACPI_BUS_TYPE_SLEEP_BUTTON:
966 strcpy(device->pnp.bus_id, "SLPF");
969 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
970 /* Clean up trailing underscores (if any) */
971 for (i = 3; i > 1; i--) {
972 if (bus_id[i] == '_')
977 strcpy(device->pnp.bus_id, bus_id);
983 * acpi_bay_match - see if a device is an ejectable driver bay
985 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
986 * then we can safely call it an ejectable drive bay
988 static int acpi_bay_match(struct acpi_device *device){
994 handle = device->handle;
996 status = acpi_get_handle(handle, "_EJ0", &tmp);
997 if (ACPI_FAILURE(status))
1000 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1001 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1002 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1003 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1006 if (acpi_get_parent(handle, &phandle))
1009 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1010 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1011 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1012 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1019 * acpi_dock_match - see if a device has a _DCK method
1021 static int acpi_dock_match(struct acpi_device *device)
1024 return acpi_get_handle(device->handle, "_DCK", &tmp);
1027 static struct acpica_device_id_list*
1029 struct acpi_device_info *info,
1030 struct acpica_device_id *new_cid)
1032 struct acpica_device_id_list *cid;
1033 char *next_id_string;
1034 acpi_size cid_length;
1035 acpi_size new_cid_length;
1039 /* Allocate new CID list with room for the new CID */
1042 new_cid_length = info->compatible_id_list.list_size;
1043 else if (info->compatible_id_list.list_size)
1044 new_cid_length = info->compatible_id_list.list_size +
1045 new_cid->length + sizeof(struct acpica_device_id);
1047 new_cid_length = sizeof(struct acpica_device_id_list) + new_cid->length;
1049 cid = ACPI_ALLOCATE_ZEROED(new_cid_length);
1054 cid->list_size = new_cid_length;
1055 cid->count = info->compatible_id_list.count;
1058 next_id_string = (char *) cid->ids + (cid->count * sizeof(struct acpica_device_id));
1060 /* Copy all existing CIDs */
1062 for (i = 0; i < info->compatible_id_list.count; i++) {
1063 cid_length = info->compatible_id_list.ids[i].length;
1064 cid->ids[i].string = next_id_string;
1065 cid->ids[i].length = cid_length;
1067 ACPI_MEMCPY(next_id_string, info->compatible_id_list.ids[i].string,
1070 next_id_string += cid_length;
1073 /* Append the new CID */
1076 cid->ids[i].string = next_id_string;
1077 cid->ids[i].length = new_cid->length;
1079 ACPI_MEMCPY(next_id_string, new_cid->string, new_cid->length);
1085 static void acpi_device_set_id(struct acpi_device *device)
1087 struct acpi_device_info *info = NULL;
1090 struct acpica_device_id_list *cid_list = NULL;
1091 char *cid_add = NULL;
1094 switch (device->device_type) {
1095 case ACPI_BUS_TYPE_DEVICE:
1096 status = acpi_get_object_info(device->handle, &info);
1097 if (ACPI_FAILURE(status)) {
1098 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1102 if (info->valid & ACPI_VALID_HID)
1103 hid = info->hardware_id.string;
1104 if (info->valid & ACPI_VALID_UID)
1105 uid = info->unique_id.string;
1106 if (info->valid & ACPI_VALID_CID)
1107 cid_list = &info->compatible_id_list;
1108 if (info->valid & ACPI_VALID_ADR) {
1109 device->pnp.bus_address = info->address;
1110 device->flags.bus_address = 1;
1113 /* If we have a video/bay/dock device, add our selfdefined
1114 HID to the CID list. Like that the video/bay/dock drivers
1115 will get autoloaded and the device might still match
1116 against another driver.
1118 if (acpi_is_video_device(device))
1119 cid_add = ACPI_VIDEO_HID;
1120 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1121 cid_add = ACPI_BAY_HID;
1122 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1123 cid_add = ACPI_DOCK_HID;
1126 case ACPI_BUS_TYPE_POWER:
1127 hid = ACPI_POWER_HID;
1129 case ACPI_BUS_TYPE_PROCESSOR:
1130 hid = ACPI_PROCESSOR_OBJECT_HID;
1132 case ACPI_BUS_TYPE_SYSTEM:
1133 hid = ACPI_SYSTEM_HID;
1135 case ACPI_BUS_TYPE_THERMAL:
1136 hid = ACPI_THERMAL_HID;
1138 case ACPI_BUS_TYPE_POWER_BUTTON:
1139 hid = ACPI_BUTTON_HID_POWERF;
1141 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1142 hid = ACPI_BUTTON_HID_SLEEPF;
1149 * Fix for the system root bus device -- the only root-level device.
1151 if (((acpi_handle)device->parent == ACPI_ROOT_OBJECT) &&
1152 (device->device_type == ACPI_BUS_TYPE_DEVICE)) {
1154 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1155 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1159 device->pnp.hardware_id = ACPI_ALLOCATE_ZEROED(strlen (hid) + 1);
1160 if (device->pnp.hardware_id) {
1161 strcpy(device->pnp.hardware_id, hid);
1162 device->flags.hardware_id = 1;
1165 if (!device->flags.hardware_id)
1166 device->pnp.hardware_id = "";
1169 device->pnp.unique_id = ACPI_ALLOCATE_ZEROED(strlen (uid) + 1);
1170 if (device->pnp.unique_id) {
1171 strcpy(device->pnp.unique_id, uid);
1172 device->flags.unique_id = 1;
1175 if (!device->flags.unique_id)
1176 device->pnp.unique_id = "";
1178 if (cid_list || cid_add) {
1179 struct acpica_device_id_list *list;
1182 struct acpica_device_id cid;
1183 cid.length = strlen (cid_add) + 1;
1184 cid.string = cid_add;
1186 list = acpi_add_cid(info, &cid);
1188 list = acpi_add_cid(info, NULL);
1192 device->pnp.cid_list = list;
1194 device->flags.compatible_ids = 1;
1201 static int acpi_device_set_context(struct acpi_device *device)
1208 * Attach this 'struct acpi_device' to the ACPI object. This makes
1209 * resolutions from handle->device very efficient. Fixed hardware
1210 * devices have no handles, so we skip them.
1212 if (!device->handle)
1215 status = acpi_attach_data(device->handle,
1216 acpi_bus_data_handler, device);
1217 if (ACPI_SUCCESS(status))
1220 printk(KERN_ERR PREFIX "Error attaching device data\n");
1224 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1229 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1230 device_release_driver(&dev->dev);
1236 * unbind _ADR-Based Devices when hot removal
1238 if (dev->flags.bus_address) {
1239 if ((dev->parent) && (dev->parent->ops.unbind))
1240 dev->parent->ops.unbind(dev);
1242 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1247 static int acpi_add_single_object(struct acpi_device **child,
1248 acpi_handle handle, int type,
1249 struct acpi_bus_ops *ops)
1252 struct acpi_device *device;
1253 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1255 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1257 printk(KERN_ERR PREFIX "Memory allocation error\n");
1261 device->device_type = type;
1262 device->handle = handle;
1263 device->parent = acpi_bus_get_parent(handle);
1264 device->bus_ops = *ops; /* workround for not call .start */
1266 acpi_device_get_busid(device);
1271 * Get prior to calling acpi_bus_get_status() so we know whether
1272 * or not _STA is present. Note that we only look for object
1273 * handles -- cannot evaluate objects until we know the device is
1274 * present and properly initialized.
1276 result = acpi_bus_get_flags(device);
1283 * See if the device is present. We always assume that non-Device
1284 * and non-Processor objects (e.g. thermal zones, power resources,
1285 * etc.) are present, functioning, etc. (at least when parent object
1286 * is present). Note that _STA has a different meaning for some
1287 * objects (e.g. power resources) so we need to be careful how we use
1291 case ACPI_BUS_TYPE_PROCESSOR:
1292 case ACPI_BUS_TYPE_DEVICE:
1293 result = acpi_bus_get_status(device);
1294 if (ACPI_FAILURE(result)) {
1299 * When the device is neither present nor functional, the
1300 * device should not be added to Linux ACPI device tree.
1301 * When the status of the device is not present but functinal,
1302 * it should be added to Linux ACPI tree. For example : bay
1303 * device , dock device.
1304 * In such conditions it is unncessary to check whether it is
1305 * bay device or dock device.
1307 if (!device->status.present && !device->status.functional) {
1313 STRUCT_TO_INT(device->status) =
1314 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1315 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
1322 * TBD: Synch with Core's enumeration/initialization process.
1326 * Hardware ID, Unique ID, & Bus Address
1327 * -------------------------------------
1329 acpi_device_set_id(device);
1335 if (device->flags.power_manageable) {
1336 result = acpi_bus_get_power_flags(device);
1342 * Wakeup device management
1343 *-----------------------
1345 if (device->flags.wake_capable) {
1346 result = acpi_bus_get_wakeup_device_flags(device);
1352 * Performance Management
1353 * ----------------------
1355 if (device->flags.performance_manageable) {
1356 result = acpi_bus_get_perf_flags(device);
1361 if ((result = acpi_device_set_context(device)))
1364 result = acpi_device_register(device);
1367 * Bind _ADR-Based Devices when hot add
1369 if (device->flags.bus_address) {
1370 if (device->parent && device->parent->ops.bind)
1371 device->parent->ops.bind(device);
1376 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1377 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1378 "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1379 (char *) buffer.pointer,
1380 device->parent ? dev_name(&device->parent->dev) :
1382 kfree(buffer.pointer);
1385 acpi_device_release(&device->dev);
1390 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops)
1392 acpi_status status = AE_OK;
1393 struct acpi_device *parent = NULL;
1394 struct acpi_device *child = NULL;
1395 acpi_handle phandle = NULL;
1396 acpi_handle chandle = NULL;
1397 acpi_object_type type = 0;
1402 * We must have an acpi_device for the starting node already, and
1403 * we scan its children.
1406 ret = acpi_bus_get_device(phandle, &parent);
1411 * Parse through the ACPI namespace, identify all 'devices', and
1412 * create a new 'struct acpi_device' for each.
1414 while ((level > 0) && parent) {
1416 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1420 * If this scope is exhausted then move our way back up.
1422 if (ACPI_FAILURE(status)) {
1425 acpi_get_parent(phandle, &phandle);
1427 parent = parent->parent;
1431 status = acpi_get_type(chandle, &type);
1432 if (ACPI_FAILURE(status))
1436 * If this is a scope object then parse it (depth-first).
1438 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1446 * We're only interested in objects that we consider 'devices'.
1449 case ACPI_TYPE_DEVICE:
1450 type = ACPI_BUS_TYPE_DEVICE;
1452 case ACPI_TYPE_PROCESSOR:
1453 type = ACPI_BUS_TYPE_PROCESSOR;
1455 case ACPI_TYPE_THERMAL:
1456 type = ACPI_BUS_TYPE_THERMAL;
1458 case ACPI_TYPE_POWER:
1459 type = ACPI_BUS_TYPE_POWER;
1465 if (ops->acpi_op_add)
1466 status = acpi_add_single_object(&child, chandle, type,
1469 status = acpi_bus_get_device(chandle, &child);
1471 if (ACPI_FAILURE(status))
1474 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1475 status = acpi_start_single_object(child);
1476 if (ACPI_FAILURE(status))
1481 * If the device is present, enabled, and functioning then
1482 * parse its scope (depth-first). Note that we need to
1483 * represent absent devices to facilitate PnP notifications
1484 * -- but only the subtree head (not all of its children,
1485 * which will be enumerated when the parent is inserted).
1487 * TBD: Need notifications and other detection mechanisms
1488 * in place before we can fully implement this.
1491 * When the device is not present but functional, it is also
1492 * necessary to scan the children of this device.
1494 if (child->status.present || (!child->status.present &&
1495 child->status.functional)) {
1496 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1498 if (ACPI_SUCCESS(status)) {
1511 acpi_bus_add(struct acpi_device **child,
1512 struct acpi_device *parent, acpi_handle handle, int type)
1515 struct acpi_bus_ops ops;
1517 memset(&ops, 0, sizeof(ops));
1518 ops.acpi_op_add = 1;
1520 result = acpi_add_single_object(child, handle, type, &ops);
1522 result = acpi_bus_scan((*child)->handle, &ops);
1526 EXPORT_SYMBOL(acpi_bus_add);
1528 int acpi_bus_start(struct acpi_device *device)
1531 struct acpi_bus_ops ops;
1533 memset(&ops, 0, sizeof(ops));
1534 ops.acpi_op_start = 1;
1536 result = acpi_start_single_object(device);
1538 result = acpi_bus_scan(device->handle, &ops);
1542 EXPORT_SYMBOL(acpi_bus_start);
1544 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1547 struct acpi_device *parent, *child;
1548 acpi_handle phandle, chandle;
1549 acpi_object_type type;
1554 phandle = start->handle;
1555 child = chandle = NULL;
1557 while ((level > 0) && parent && (!err)) {
1558 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1562 * If this scope is exhausted then move our way back up.
1564 if (ACPI_FAILURE(status)) {
1567 acpi_get_parent(phandle, &phandle);
1569 parent = parent->parent;
1572 err = acpi_bus_remove(child, rmdevice);
1574 err = acpi_bus_remove(child, 1);
1579 status = acpi_get_type(chandle, &type);
1580 if (ACPI_FAILURE(status)) {
1584 * If there is a device corresponding to chandle then
1585 * parse it (depth-first).
1587 if (acpi_bus_get_device(chandle, &child) == 0) {
1597 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1599 static int acpi_bus_scan_fixed(void)
1602 struct acpi_device *device = NULL;
1603 struct acpi_bus_ops ops;
1605 memset(&ops, 0, sizeof(ops));
1606 ops.acpi_op_add = 1;
1607 ops.acpi_op_start = 1;
1610 * Enumerate all fixed-feature devices.
1612 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1613 result = acpi_add_single_object(&device, NULL,
1614 ACPI_BUS_TYPE_POWER_BUTTON,
1618 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1619 result = acpi_add_single_object(&device, NULL,
1620 ACPI_BUS_TYPE_SLEEP_BUTTON,
1627 int __init acpi_scan_init(void)
1630 struct acpi_bus_ops ops;
1632 memset(&ops, 0, sizeof(ops));
1633 ops.acpi_op_add = 1;
1634 ops.acpi_op_start = 1;
1636 result = bus_register(&acpi_bus_type);
1638 /* We don't want to quit even if we failed to add suspend/resume */
1639 printk(KERN_ERR PREFIX "Could not register bus type\n");
1643 * Create the root device in the bus's device tree
1645 result = acpi_add_single_object(&acpi_root, ACPI_ROOT_OBJECT,
1646 ACPI_BUS_TYPE_SYSTEM, &ops);
1651 * Enumerate devices in the ACPI namespace.
1653 result = acpi_bus_scan_fixed();
1656 result = acpi_bus_scan(acpi_root->handle, &ops);
1659 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);