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 acpi_compatible_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->id[i].value);
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 acpi_compatible_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->id[i].value))
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);
315 static int acpi_device_suspend(struct device *dev, pm_message_t state)
317 struct acpi_device *acpi_dev = to_acpi_device(dev);
318 struct acpi_driver *acpi_drv = acpi_dev->driver;
320 if (acpi_drv && acpi_drv->ops.suspend)
321 return acpi_drv->ops.suspend(acpi_dev, state);
325 static int acpi_device_resume(struct device *dev)
327 struct acpi_device *acpi_dev = to_acpi_device(dev);
328 struct acpi_driver *acpi_drv = acpi_dev->driver;
330 if (acpi_drv && acpi_drv->ops.resume)
331 return acpi_drv->ops.resume(acpi_dev);
335 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
337 struct acpi_device *acpi_dev = to_acpi_device(dev);
338 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
340 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
343 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
345 struct acpi_device *acpi_dev = to_acpi_device(dev);
348 if (add_uevent_var(env, "MODALIAS="))
350 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
351 sizeof(env->buf) - env->buflen);
352 if (len >= (sizeof(env->buf) - env->buflen))
358 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
360 struct acpi_device *device = data;
362 device->driver->ops.notify(device, event);
365 static acpi_status acpi_device_notify_fixed(void *data)
367 struct acpi_device *device = data;
369 acpi_device_notify(device->handle, ACPI_FIXED_HARDWARE_EVENT, device);
373 static int acpi_device_install_notify_handler(struct acpi_device *device)
378 hid = acpi_device_hid(device);
379 if (!strcmp(hid, ACPI_BUTTON_HID_POWERF))
381 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
382 acpi_device_notify_fixed,
384 else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEPF))
386 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
387 acpi_device_notify_fixed,
390 status = acpi_install_notify_handler(device->handle,
395 if (ACPI_FAILURE(status))
400 static void acpi_device_remove_notify_handler(struct acpi_device *device)
402 if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF))
403 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
404 acpi_device_notify_fixed);
405 else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF))
406 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
407 acpi_device_notify_fixed);
409 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
413 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
414 static int acpi_start_single_object(struct acpi_device *);
415 static int acpi_device_probe(struct device * dev)
417 struct acpi_device *acpi_dev = to_acpi_device(dev);
418 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
421 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
423 if (acpi_dev->bus_ops.acpi_op_start)
424 acpi_start_single_object(acpi_dev);
426 if (acpi_drv->ops.notify) {
427 ret = acpi_device_install_notify_handler(acpi_dev);
429 if (acpi_drv->ops.stop)
430 acpi_drv->ops.stop(acpi_dev,
431 acpi_dev->removal_type);
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.stop)
456 acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
457 if (acpi_drv->ops.remove)
458 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
460 acpi_dev->driver = NULL;
461 acpi_dev->driver_data = NULL;
467 struct bus_type acpi_bus_type = {
469 .suspend = acpi_device_suspend,
470 .resume = acpi_device_resume,
471 .match = acpi_bus_match,
472 .probe = acpi_device_probe,
473 .remove = acpi_device_remove,
474 .uevent = acpi_device_uevent,
477 static int acpi_device_register(struct acpi_device *device,
478 struct acpi_device *parent)
481 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
486 * Link this device to its parent and siblings.
488 INIT_LIST_HEAD(&device->children);
489 INIT_LIST_HEAD(&device->node);
490 INIT_LIST_HEAD(&device->wakeup_list);
492 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
494 printk(KERN_ERR PREFIX "Memory allocation error\n");
498 mutex_lock(&acpi_device_lock);
500 * Find suitable bus_id and instance number in acpi_bus_id_list
501 * If failed, create one and link it into acpi_bus_id_list
503 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
504 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
505 acpi_device_bus_id->instance_no ++;
512 acpi_device_bus_id = new_bus_id;
513 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
514 acpi_device_bus_id->instance_no = 0;
515 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
517 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
520 list_add_tail(&device->node, &device->parent->children);
522 if (device->wakeup.flags.valid)
523 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
524 mutex_unlock(&acpi_device_lock);
527 device->dev.parent = &parent->dev;
528 device->dev.bus = &acpi_bus_type;
529 device->dev.release = &acpi_device_release;
530 result = device_register(&device->dev);
532 dev_err(&device->dev, "Error registering device\n");
536 result = acpi_device_setup_files(device);
538 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
539 dev_name(&device->dev));
541 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
544 mutex_lock(&acpi_device_lock);
546 list_del(&device->node);
547 list_del(&device->wakeup_list);
548 mutex_unlock(&acpi_device_lock);
552 static void acpi_device_unregister(struct acpi_device *device, int type)
554 mutex_lock(&acpi_device_lock);
556 list_del(&device->node);
558 list_del(&device->wakeup_list);
559 mutex_unlock(&acpi_device_lock);
561 acpi_detach_data(device->handle, acpi_bus_data_handler);
563 acpi_device_remove_files(device);
564 device_unregister(&device->dev);
567 /* --------------------------------------------------------------------------
569 -------------------------------------------------------------------------- */
571 * acpi_bus_driver_init - add a device to a driver
572 * @device: the device to add and initialize
573 * @driver: driver for the device
575 * Used to initialize a device via its device driver. Called whenever a
576 * driver is bound to a device. Invokes the driver's add() ops.
579 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
583 if (!device || !driver)
586 if (!driver->ops.add)
589 result = driver->ops.add(device);
591 device->driver = NULL;
592 device->driver_data = NULL;
596 device->driver = driver;
599 * TBD - Configuration Management: Assign resources to device based
600 * upon possible configuration and currently allocated resources.
603 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
604 "Driver successfully bound to device\n"));
608 static int acpi_start_single_object(struct acpi_device *device)
611 struct acpi_driver *driver;
614 if (!(driver = device->driver))
617 if (driver->ops.start) {
618 result = driver->ops.start(device);
619 if (result && driver->ops.remove)
620 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
627 * acpi_bus_register_driver - register a driver with the ACPI bus
628 * @driver: driver being registered
630 * Registers a driver with the ACPI bus. Searches the namespace for all
631 * devices that match the driver's criteria and binds. Returns zero for
632 * success or a negative error status for failure.
634 int acpi_bus_register_driver(struct acpi_driver *driver)
640 driver->drv.name = driver->name;
641 driver->drv.bus = &acpi_bus_type;
642 driver->drv.owner = driver->owner;
644 ret = driver_register(&driver->drv);
648 EXPORT_SYMBOL(acpi_bus_register_driver);
651 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
652 * @driver: driver to unregister
654 * Unregisters a driver with the ACPI bus. Searches the namespace for all
655 * devices that match the driver's criteria and unbinds.
657 void acpi_bus_unregister_driver(struct acpi_driver *driver)
659 driver_unregister(&driver->drv);
662 EXPORT_SYMBOL(acpi_bus_unregister_driver);
664 /* --------------------------------------------------------------------------
666 -------------------------------------------------------------------------- */
668 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
672 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
673 union acpi_object *obj;
675 status = acpi_get_handle(handle, "_EJD", &tmp);
676 if (ACPI_FAILURE(status))
679 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
680 if (ACPI_SUCCESS(status)) {
681 obj = buffer.pointer;
682 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
684 kfree(buffer.pointer);
688 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
690 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
698 static int acpi_bus_get_perf_flags(struct acpi_device *device)
700 device->performance.state = ACPI_STATE_UNKNOWN;
705 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
706 union acpi_object *package)
709 union acpi_object *element = NULL;
711 if (!device || !package || (package->package.count < 2))
712 return AE_BAD_PARAMETER;
714 element = &(package->package.elements[0]);
716 return AE_BAD_PARAMETER;
717 if (element->type == ACPI_TYPE_PACKAGE) {
718 if ((element->package.count < 2) ||
719 (element->package.elements[0].type !=
720 ACPI_TYPE_LOCAL_REFERENCE)
721 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
723 device->wakeup.gpe_device =
724 element->package.elements[0].reference.handle;
725 device->wakeup.gpe_number =
726 (u32) element->package.elements[1].integer.value;
727 } else if (element->type == ACPI_TYPE_INTEGER) {
728 device->wakeup.gpe_number = element->integer.value;
732 element = &(package->package.elements[1]);
733 if (element->type != ACPI_TYPE_INTEGER) {
736 device->wakeup.sleep_state = element->integer.value;
738 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
741 device->wakeup.resources.count = package->package.count - 2;
742 for (i = 0; i < device->wakeup.resources.count; i++) {
743 element = &(package->package.elements[i + 2]);
744 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
747 device->wakeup.resources.handles[i] = element->reference.handle;
753 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
755 acpi_status status = 0;
756 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
757 union acpi_object *package = NULL;
760 struct acpi_device_id button_device_ids[] = {
768 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
769 if (ACPI_FAILURE(status)) {
770 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
774 package = (union acpi_object *)buffer.pointer;
775 status = acpi_bus_extract_wakeup_device_power_package(device, package);
776 if (ACPI_FAILURE(status)) {
777 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
781 kfree(buffer.pointer);
783 device->wakeup.flags.valid = 1;
784 device->wakeup.prepare_count = 0;
785 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
786 * system for the ACPI device with the _PRW object.
787 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
788 * So it is necessary to call _DSW object first. Only when it is not
789 * present will the _PSW object used.
791 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
793 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
794 "error in _DSW or _PSW evaluation\n"));
796 /* Power button, Lid switch always enable wakeup */
797 if (!acpi_match_device_ids(device, button_device_ids))
798 device->wakeup.flags.run_wake = 1;
801 if (ACPI_FAILURE(status))
802 device->flags.wake_capable = 0;
806 static int acpi_bus_get_power_flags(struct acpi_device *device)
808 acpi_status status = 0;
809 acpi_handle handle = NULL;
814 * Power Management Flags
816 status = acpi_get_handle(device->handle, "_PSC", &handle);
817 if (ACPI_SUCCESS(status))
818 device->power.flags.explicit_get = 1;
819 status = acpi_get_handle(device->handle, "_IRC", &handle);
820 if (ACPI_SUCCESS(status))
821 device->power.flags.inrush_current = 1;
824 * Enumerate supported power management states
826 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
827 struct acpi_device_power_state *ps = &device->power.states[i];
828 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
830 /* Evaluate "_PRx" to se if power resources are referenced */
831 acpi_evaluate_reference(device->handle, object_name, NULL,
833 if (ps->resources.count) {
834 device->power.flags.power_resources = 1;
838 /* Evaluate "_PSx" to see if we can do explicit sets */
839 object_name[2] = 'S';
840 status = acpi_get_handle(device->handle, object_name, &handle);
841 if (ACPI_SUCCESS(status)) {
842 ps->flags.explicit_set = 1;
846 /* State is valid if we have some power control */
847 if (ps->resources.count || ps->flags.explicit_set)
850 ps->power = -1; /* Unknown - driver assigned */
851 ps->latency = -1; /* Unknown - driver assigned */
854 /* Set defaults for D0 and D3 states (always valid) */
855 device->power.states[ACPI_STATE_D0].flags.valid = 1;
856 device->power.states[ACPI_STATE_D0].power = 100;
857 device->power.states[ACPI_STATE_D3].flags.valid = 1;
858 device->power.states[ACPI_STATE_D3].power = 0;
860 /* TBD: System wake support and resource requirements. */
862 device->power.state = ACPI_STATE_UNKNOWN;
863 acpi_bus_get_power(device->handle, &(device->power.state));
868 static int acpi_bus_get_flags(struct acpi_device *device)
870 acpi_status status = AE_OK;
871 acpi_handle temp = NULL;
874 /* Presence of _STA indicates 'dynamic_status' */
875 status = acpi_get_handle(device->handle, "_STA", &temp);
876 if (ACPI_SUCCESS(status))
877 device->flags.dynamic_status = 1;
879 /* Presence of _CID indicates 'compatible_ids' */
880 status = acpi_get_handle(device->handle, "_CID", &temp);
881 if (ACPI_SUCCESS(status))
882 device->flags.compatible_ids = 1;
884 /* Presence of _RMV indicates 'removable' */
885 status = acpi_get_handle(device->handle, "_RMV", &temp);
886 if (ACPI_SUCCESS(status))
887 device->flags.removable = 1;
889 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
890 status = acpi_get_handle(device->handle, "_EJD", &temp);
891 if (ACPI_SUCCESS(status))
892 device->flags.ejectable = 1;
894 status = acpi_get_handle(device->handle, "_EJ0", &temp);
895 if (ACPI_SUCCESS(status))
896 device->flags.ejectable = 1;
899 /* Presence of _LCK indicates 'lockable' */
900 status = acpi_get_handle(device->handle, "_LCK", &temp);
901 if (ACPI_SUCCESS(status))
902 device->flags.lockable = 1;
904 /* Presence of _PS0|_PR0 indicates 'power manageable' */
905 status = acpi_get_handle(device->handle, "_PS0", &temp);
906 if (ACPI_FAILURE(status))
907 status = acpi_get_handle(device->handle, "_PR0", &temp);
908 if (ACPI_SUCCESS(status))
909 device->flags.power_manageable = 1;
911 /* Presence of _PRW indicates wake capable */
912 status = acpi_get_handle(device->handle, "_PRW", &temp);
913 if (ACPI_SUCCESS(status))
914 device->flags.wake_capable = 1;
916 /* TBD: Performance management */
921 static void acpi_device_get_busid(struct acpi_device *device,
922 acpi_handle handle, int type)
924 char bus_id[5] = { '?', 0 };
925 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
931 * The device's Bus ID is simply the object name.
932 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
935 case ACPI_BUS_TYPE_SYSTEM:
936 strcpy(device->pnp.bus_id, "ACPI");
938 case ACPI_BUS_TYPE_POWER_BUTTON:
939 strcpy(device->pnp.bus_id, "PWRF");
941 case ACPI_BUS_TYPE_SLEEP_BUTTON:
942 strcpy(device->pnp.bus_id, "SLPF");
945 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
946 /* Clean up trailing underscores (if any) */
947 for (i = 3; i > 1; i--) {
948 if (bus_id[i] == '_')
953 strcpy(device->pnp.bus_id, bus_id);
959 * acpi_bay_match - see if a device is an ejectable driver bay
961 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
962 * then we can safely call it an ejectable drive bay
964 static int acpi_bay_match(struct acpi_device *device){
970 handle = device->handle;
972 status = acpi_get_handle(handle, "_EJ0", &tmp);
973 if (ACPI_FAILURE(status))
976 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
977 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
978 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
979 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
982 if (acpi_get_parent(handle, &phandle))
985 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
986 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
987 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
988 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
995 * acpi_dock_match - see if a device has a _DCK method
997 static int acpi_dock_match(struct acpi_device *device)
1000 return acpi_get_handle(device->handle, "_DCK", &tmp);
1003 static void acpi_device_set_id(struct acpi_device *device,
1004 struct acpi_device *parent, acpi_handle handle,
1007 struct acpi_device_info *info;
1008 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1011 struct acpi_compatible_id_list *cid_list = NULL;
1012 const char *cid_add = NULL;
1016 case ACPI_BUS_TYPE_DEVICE:
1017 status = acpi_get_object_info(handle, &buffer);
1018 if (ACPI_FAILURE(status)) {
1019 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1023 info = buffer.pointer;
1024 if (info->valid & ACPI_VALID_HID)
1025 hid = info->hardware_id.value;
1026 if (info->valid & ACPI_VALID_UID)
1027 uid = info->unique_id.value;
1028 if (info->valid & ACPI_VALID_CID)
1029 cid_list = &info->compatibility_id;
1030 if (info->valid & ACPI_VALID_ADR) {
1031 device->pnp.bus_address = info->address;
1032 device->flags.bus_address = 1;
1035 /* If we have a video/bay/dock device, add our selfdefined
1036 HID to the CID list. Like that the video/bay/dock drivers
1037 will get autoloaded and the device might still match
1038 against another driver.
1040 if (acpi_is_video_device(device))
1041 cid_add = ACPI_VIDEO_HID;
1042 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1043 cid_add = ACPI_BAY_HID;
1044 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1045 cid_add = ACPI_DOCK_HID;
1048 case ACPI_BUS_TYPE_POWER:
1049 hid = ACPI_POWER_HID;
1051 case ACPI_BUS_TYPE_PROCESSOR:
1052 hid = ACPI_PROCESSOR_OBJECT_HID;
1054 case ACPI_BUS_TYPE_SYSTEM:
1055 hid = ACPI_SYSTEM_HID;
1057 case ACPI_BUS_TYPE_THERMAL:
1058 hid = ACPI_THERMAL_HID;
1060 case ACPI_BUS_TYPE_POWER_BUTTON:
1061 hid = ACPI_BUTTON_HID_POWERF;
1063 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1064 hid = ACPI_BUTTON_HID_SLEEPF;
1071 * Fix for the system root bus device -- the only root-level device.
1073 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1075 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1076 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1080 strcpy(device->pnp.hardware_id, hid);
1081 device->flags.hardware_id = 1;
1084 strcpy(device->pnp.unique_id, uid);
1085 device->flags.unique_id = 1;
1087 if (cid_list || cid_add) {
1088 struct acpi_compatible_id_list *list;
1093 size = cid_list->size;
1094 } else if (cid_add) {
1095 size = sizeof(struct acpi_compatible_id_list);
1096 cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1098 printk(KERN_ERR "Memory allocation error\n");
1099 kfree(buffer.pointer);
1102 cid_list->count = 0;
1103 cid_list->size = size;
1107 size += sizeof(struct acpi_compatible_id);
1108 list = kmalloc(size, GFP_KERNEL);
1112 memcpy(list, cid_list, cid_list->size);
1113 count = cid_list->count;
1116 strncpy(list->id[count].value, cid_add,
1117 ACPI_MAX_CID_LENGTH);
1119 device->flags.compatible_ids = 1;
1122 list->count = count;
1123 device->pnp.cid_list = list;
1125 printk(KERN_ERR PREFIX "Memory allocation error\n");
1128 kfree(buffer.pointer);
1131 static int acpi_device_set_context(struct acpi_device *device, int type)
1133 acpi_status status = AE_OK;
1138 * Attach this 'struct acpi_device' to the ACPI object. This makes
1139 * resolutions from handle->device very efficient. Note that we need
1140 * to be careful with fixed-feature devices as they all attach to the
1143 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1144 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1145 status = acpi_attach_data(device->handle,
1146 acpi_bus_data_handler, device);
1148 if (ACPI_FAILURE(status)) {
1149 printk(KERN_ERR PREFIX "Error attaching device data\n");
1156 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1161 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1162 device_release_driver(&dev->dev);
1168 * unbind _ADR-Based Devices when hot removal
1170 if (dev->flags.bus_address) {
1171 if ((dev->parent) && (dev->parent->ops.unbind))
1172 dev->parent->ops.unbind(dev);
1174 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1180 acpi_add_single_object(struct acpi_device **child,
1181 struct acpi_device *parent, acpi_handle handle, int type,
1182 struct acpi_bus_ops *ops)
1185 struct acpi_device *device = NULL;
1191 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1193 printk(KERN_ERR PREFIX "Memory allocation error\n");
1197 device->handle = handle;
1198 device->parent = parent;
1199 device->bus_ops = *ops; /* workround for not call .start */
1202 acpi_device_get_busid(device, handle, type);
1207 * Get prior to calling acpi_bus_get_status() so we know whether
1208 * or not _STA is present. Note that we only look for object
1209 * handles -- cannot evaluate objects until we know the device is
1210 * present and properly initialized.
1212 result = acpi_bus_get_flags(device);
1219 * See if the device is present. We always assume that non-Device
1220 * and non-Processor objects (e.g. thermal zones, power resources,
1221 * etc.) are present, functioning, etc. (at least when parent object
1222 * is present). Note that _STA has a different meaning for some
1223 * objects (e.g. power resources) so we need to be careful how we use
1227 case ACPI_BUS_TYPE_PROCESSOR:
1228 case ACPI_BUS_TYPE_DEVICE:
1229 result = acpi_bus_get_status(device);
1230 if (ACPI_FAILURE(result)) {
1235 * When the device is neither present nor functional, the
1236 * device should not be added to Linux ACPI device tree.
1237 * When the status of the device is not present but functinal,
1238 * it should be added to Linux ACPI tree. For example : bay
1239 * device , dock device.
1240 * In such conditions it is unncessary to check whether it is
1241 * bay device or dock device.
1243 if (!device->status.present && !device->status.functional) {
1249 STRUCT_TO_INT(device->status) =
1250 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1251 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
1258 * TBD: Synch with Core's enumeration/initialization process.
1262 * Hardware ID, Unique ID, & Bus Address
1263 * -------------------------------------
1265 acpi_device_set_id(device, parent, handle, type);
1268 * The ACPI device is attached to acpi handle before getting
1269 * the power/wakeup/peformance flags. Otherwise OS can't get
1270 * the corresponding ACPI device by the acpi handle in the course
1271 * of getting the power/wakeup/performance flags.
1273 result = acpi_device_set_context(device, type);
1281 if (device->flags.power_manageable) {
1282 result = acpi_bus_get_power_flags(device);
1288 * Wakeup device management
1289 *-----------------------
1291 if (device->flags.wake_capable) {
1292 result = acpi_bus_get_wakeup_device_flags(device);
1298 * Performance Management
1299 * ----------------------
1301 if (device->flags.performance_manageable) {
1302 result = acpi_bus_get_perf_flags(device);
1308 result = acpi_device_register(device, parent);
1311 * Bind _ADR-Based Devices when hot add
1313 if (device->flags.bus_address) {
1314 if (device->parent && device->parent->ops.bind)
1315 device->parent->ops.bind(device);
1322 kfree(device->pnp.cid_list);
1329 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1331 acpi_status status = AE_OK;
1332 struct acpi_device *parent = NULL;
1333 struct acpi_device *child = NULL;
1334 acpi_handle phandle = NULL;
1335 acpi_handle chandle = NULL;
1336 acpi_object_type type = 0;
1344 phandle = start->handle;
1347 * Parse through the ACPI namespace, identify all 'devices', and
1348 * create a new 'struct acpi_device' for each.
1350 while ((level > 0) && parent) {
1352 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1356 * If this scope is exhausted then move our way back up.
1358 if (ACPI_FAILURE(status)) {
1361 acpi_get_parent(phandle, &phandle);
1363 parent = parent->parent;
1367 status = acpi_get_type(chandle, &type);
1368 if (ACPI_FAILURE(status))
1372 * If this is a scope object then parse it (depth-first).
1374 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1382 * We're only interested in objects that we consider 'devices'.
1385 case ACPI_TYPE_DEVICE:
1386 type = ACPI_BUS_TYPE_DEVICE;
1388 case ACPI_TYPE_PROCESSOR:
1389 type = ACPI_BUS_TYPE_PROCESSOR;
1391 case ACPI_TYPE_THERMAL:
1392 type = ACPI_BUS_TYPE_THERMAL;
1394 case ACPI_TYPE_POWER:
1395 type = ACPI_BUS_TYPE_POWER;
1401 if (ops->acpi_op_add)
1402 status = acpi_add_single_object(&child, parent,
1403 chandle, type, ops);
1405 status = acpi_bus_get_device(chandle, &child);
1407 if (ACPI_FAILURE(status))
1410 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1411 status = acpi_start_single_object(child);
1412 if (ACPI_FAILURE(status))
1417 * If the device is present, enabled, and functioning then
1418 * parse its scope (depth-first). Note that we need to
1419 * represent absent devices to facilitate PnP notifications
1420 * -- but only the subtree head (not all of its children,
1421 * which will be enumerated when the parent is inserted).
1423 * TBD: Need notifications and other detection mechanisms
1424 * in place before we can fully implement this.
1427 * When the device is not present but functional, it is also
1428 * necessary to scan the children of this device.
1430 if (child->status.present || (!child->status.present &&
1431 child->status.functional)) {
1432 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1434 if (ACPI_SUCCESS(status)) {
1447 acpi_bus_add(struct acpi_device **child,
1448 struct acpi_device *parent, acpi_handle handle, int type)
1451 struct acpi_bus_ops ops;
1453 memset(&ops, 0, sizeof(ops));
1454 ops.acpi_op_add = 1;
1456 result = acpi_add_single_object(child, parent, handle, type, &ops);
1458 result = acpi_bus_scan(*child, &ops);
1462 EXPORT_SYMBOL(acpi_bus_add);
1464 int acpi_bus_start(struct acpi_device *device)
1467 struct acpi_bus_ops ops;
1473 result = acpi_start_single_object(device);
1475 memset(&ops, 0, sizeof(ops));
1476 ops.acpi_op_start = 1;
1477 result = acpi_bus_scan(device, &ops);
1481 EXPORT_SYMBOL(acpi_bus_start);
1483 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1486 struct acpi_device *parent, *child;
1487 acpi_handle phandle, chandle;
1488 acpi_object_type type;
1493 phandle = start->handle;
1494 child = chandle = NULL;
1496 while ((level > 0) && parent && (!err)) {
1497 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1501 * If this scope is exhausted then move our way back up.
1503 if (ACPI_FAILURE(status)) {
1506 acpi_get_parent(phandle, &phandle);
1508 parent = parent->parent;
1511 err = acpi_bus_remove(child, rmdevice);
1513 err = acpi_bus_remove(child, 1);
1518 status = acpi_get_type(chandle, &type);
1519 if (ACPI_FAILURE(status)) {
1523 * If there is a device corresponding to chandle then
1524 * parse it (depth-first).
1526 if (acpi_bus_get_device(chandle, &child) == 0) {
1536 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1538 static int acpi_bus_scan_fixed(struct acpi_device *root)
1541 struct acpi_device *device = NULL;
1542 struct acpi_bus_ops ops;
1547 memset(&ops, 0, sizeof(ops));
1548 ops.acpi_op_add = 1;
1549 ops.acpi_op_start = 1;
1552 * Enumerate all fixed-feature devices.
1554 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1555 result = acpi_add_single_object(&device, acpi_root,
1557 ACPI_BUS_TYPE_POWER_BUTTON,
1561 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1562 result = acpi_add_single_object(&device, acpi_root,
1564 ACPI_BUS_TYPE_SLEEP_BUTTON,
1571 int __init acpi_scan_init(void)
1574 struct acpi_bus_ops ops;
1576 memset(&ops, 0, sizeof(ops));
1577 ops.acpi_op_add = 1;
1578 ops.acpi_op_start = 1;
1580 result = bus_register(&acpi_bus_type);
1582 /* We don't want to quit even if we failed to add suspend/resume */
1583 printk(KERN_ERR PREFIX "Could not register bus type\n");
1587 * Create the root device in the bus's device tree
1589 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1590 ACPI_BUS_TYPE_SYSTEM, &ops);
1595 * Enumerate devices in the ACPI namespace.
1597 result = acpi_bus_scan_fixed(acpi_root);
1600 result = acpi_bus_scan(acpi_root, &ops);
1603 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);