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>
13 #include <acpi/acinterp.h> /* for acpi_ex_eisa_id_to_string() */
15 #define _COMPONENT ACPI_BUS_COMPONENT
16 ACPI_MODULE_NAME("scan");
17 #define STRUCT_TO_INT(s) (*((int*)&s))
18 extern struct acpi_device *acpi_root;
20 #define ACPI_BUS_CLASS "system_bus"
21 #define ACPI_BUS_HID "LNXSYBUS"
22 #define ACPI_BUS_DEVICE_NAME "System Bus"
24 static LIST_HEAD(acpi_device_list);
25 static LIST_HEAD(acpi_bus_id_list);
26 DEFINE_SPINLOCK(acpi_device_lock);
27 LIST_HEAD(acpi_wakeup_device_list);
29 struct acpi_device_bus_id{
31 unsigned int instance_no;
32 struct list_head node;
36 * Creates hid/cid(s) string needed for modalias and uevent
37 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
38 * char *modalias: "acpi:IBM0001:ACPI0001"
40 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
46 if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
49 len = snprintf(modalias, size, "acpi:");
52 if (acpi_dev->flags.hardware_id) {
53 count = snprintf(&modalias[len], size, "%s:",
54 acpi_dev->pnp.hardware_id);
55 if (count < 0 || count >= size)
61 if (acpi_dev->flags.compatible_ids) {
62 struct acpi_compatible_id_list *cid_list;
65 cid_list = acpi_dev->pnp.cid_list;
66 for (i = 0; i < cid_list->count; i++) {
67 count = snprintf(&modalias[len], size, "%s:",
68 cid_list->id[i].value);
69 if (count < 0 || count >= size) {
70 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
71 acpi_dev->pnp.device_name, i);
84 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
85 struct acpi_device *acpi_dev = to_acpi_device(dev);
88 /* Device has no HID and no CID or string is >1024 */
89 len = create_modalias(acpi_dev, buf, 1024);
95 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
97 static int acpi_bus_hot_remove_device(void *context)
99 struct acpi_device *device;
100 acpi_handle handle = context;
101 struct acpi_object_list arg_list;
102 union acpi_object arg;
103 acpi_status status = AE_OK;
105 if (acpi_bus_get_device(handle, &device))
111 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
112 "Hot-removing device %s...\n", device->dev.bus_id));
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))
151 acpi_eject_store(struct device *d, struct device_attribute *attr,
152 const char *buf, size_t count)
156 acpi_object_type type = 0;
157 struct acpi_device *acpi_device = to_acpi_device(d);
158 struct task_struct *task;
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 /* remove the device in another thread to fix the deadlock issue */
176 task = kthread_run(acpi_bus_hot_remove_device,
177 acpi_device->handle, "acpi_hot_remove_device");
184 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
187 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
188 struct acpi_device *acpi_dev = to_acpi_device(dev);
190 return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
192 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
195 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
196 struct acpi_device *acpi_dev = to_acpi_device(dev);
197 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
200 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
204 result = sprintf(buf, "%s\n", (char*)path.pointer);
209 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
211 static int acpi_device_setup_files(struct acpi_device *dev)
218 * Devices gotten from FADT don't have a "path" attribute
221 result = device_create_file(&dev->dev, &dev_attr_path);
226 if(dev->flags.hardware_id) {
227 result = device_create_file(&dev->dev, &dev_attr_hid);
232 if (dev->flags.hardware_id || dev->flags.compatible_ids){
233 result = device_create_file(&dev->dev, &dev_attr_modalias);
239 * If device has _EJ0, 'eject' file is created that is used to trigger
240 * hot-removal function from userland.
242 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
243 if (ACPI_SUCCESS(status))
244 result = device_create_file(&dev->dev, &dev_attr_eject);
249 static void acpi_device_remove_files(struct acpi_device *dev)
255 * If device has _EJ0, 'eject' file is created that is used to trigger
256 * hot-removal function from userland.
258 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
259 if (ACPI_SUCCESS(status))
260 device_remove_file(&dev->dev, &dev_attr_eject);
262 if (dev->flags.hardware_id || dev->flags.compatible_ids)
263 device_remove_file(&dev->dev, &dev_attr_modalias);
265 if(dev->flags.hardware_id)
266 device_remove_file(&dev->dev, &dev_attr_hid);
268 device_remove_file(&dev->dev, &dev_attr_path);
270 /* --------------------------------------------------------------------------
272 -------------------------------------------------------------------------- */
274 int acpi_match_device_ids(struct acpi_device *device,
275 const struct acpi_device_id *ids)
277 const struct acpi_device_id *id;
280 * If the device is not present, it is unnecessary to load device
283 if (!device->status.present)
286 if (device->flags.hardware_id) {
287 for (id = ids; id->id[0]; id++) {
288 if (!strcmp((char*)id->id, device->pnp.hardware_id))
293 if (device->flags.compatible_ids) {
294 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
297 for (id = ids; id->id[0]; id++) {
298 /* compare multiple _CID entries against driver ids */
299 for (i = 0; i < cid_list->count; i++) {
300 if (!strcmp((char*)id->id,
301 cid_list->id[i].value))
309 EXPORT_SYMBOL(acpi_match_device_ids);
311 static void acpi_device_release(struct device *dev)
313 struct acpi_device *acpi_dev = to_acpi_device(dev);
315 kfree(acpi_dev->pnp.cid_list);
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 int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
363 static int acpi_start_single_object(struct acpi_device *);
364 static int acpi_device_probe(struct device * dev)
366 struct acpi_device *acpi_dev = to_acpi_device(dev);
367 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
370 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
372 if (acpi_dev->bus_ops.acpi_op_start)
373 acpi_start_single_object(acpi_dev);
374 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
375 "Found driver [%s] for device [%s]\n",
376 acpi_drv->name, acpi_dev->pnp.bus_id));
382 static int acpi_device_remove(struct device * dev)
384 struct acpi_device *acpi_dev = to_acpi_device(dev);
385 struct acpi_driver *acpi_drv = acpi_dev->driver;
388 if (acpi_drv->ops.stop)
389 acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
390 if (acpi_drv->ops.remove)
391 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
393 acpi_dev->driver = NULL;
394 acpi_driver_data(dev) = NULL;
400 static void acpi_device_shutdown(struct device *dev)
402 struct acpi_device *acpi_dev = to_acpi_device(dev);
403 struct acpi_driver *acpi_drv = acpi_dev->driver;
405 if (acpi_drv && acpi_drv->ops.shutdown)
406 acpi_drv->ops.shutdown(acpi_dev);
411 struct bus_type acpi_bus_type = {
413 .suspend = acpi_device_suspend,
414 .resume = acpi_device_resume,
415 .shutdown = acpi_device_shutdown,
416 .match = acpi_bus_match,
417 .probe = acpi_device_probe,
418 .remove = acpi_device_remove,
419 .uevent = acpi_device_uevent,
422 static int acpi_device_register(struct acpi_device *device,
423 struct acpi_device *parent)
426 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
431 * Link this device to its parent and siblings.
433 INIT_LIST_HEAD(&device->children);
434 INIT_LIST_HEAD(&device->node);
435 INIT_LIST_HEAD(&device->g_list);
436 INIT_LIST_HEAD(&device->wakeup_list);
438 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
440 printk(KERN_ERR PREFIX "Memory allocation error\n");
444 spin_lock(&acpi_device_lock);
446 * Find suitable bus_id and instance number in acpi_bus_id_list
447 * If failed, create one and link it into acpi_bus_id_list
449 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
450 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
451 acpi_device_bus_id->instance_no ++;
458 acpi_device_bus_id = new_bus_id;
459 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
460 acpi_device_bus_id->instance_no = 0;
461 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
463 sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
465 if (device->parent) {
466 list_add_tail(&device->node, &device->parent->children);
467 list_add_tail(&device->g_list, &device->parent->g_list);
469 list_add_tail(&device->g_list, &acpi_device_list);
470 if (device->wakeup.flags.valid)
471 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
472 spin_unlock(&acpi_device_lock);
475 device->dev.parent = &parent->dev;
476 device->dev.bus = &acpi_bus_type;
477 device_initialize(&device->dev);
478 device->dev.release = &acpi_device_release;
479 result = device_add(&device->dev);
481 dev_err(&device->dev, "Error adding device\n");
485 result = acpi_device_setup_files(device);
487 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", device->dev.bus_id);
489 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
492 spin_lock(&acpi_device_lock);
493 if (device->parent) {
494 list_del(&device->node);
495 list_del(&device->g_list);
497 list_del(&device->g_list);
498 list_del(&device->wakeup_list);
499 spin_unlock(&acpi_device_lock);
503 static void acpi_device_unregister(struct acpi_device *device, int type)
505 spin_lock(&acpi_device_lock);
506 if (device->parent) {
507 list_del(&device->node);
508 list_del(&device->g_list);
510 list_del(&device->g_list);
512 list_del(&device->wakeup_list);
513 spin_unlock(&acpi_device_lock);
515 acpi_detach_data(device->handle, acpi_bus_data_handler);
517 acpi_device_remove_files(device);
518 device_unregister(&device->dev);
521 /* --------------------------------------------------------------------------
523 -------------------------------------------------------------------------- */
525 * acpi_bus_driver_init - add a device to a driver
526 * @device: the device to add and initialize
527 * @driver: driver for the device
529 * Used to initialize a device via its device driver. Called whenever a
530 * driver is bound to a device. Invokes the driver's add() ops.
533 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
538 if (!device || !driver)
541 if (!driver->ops.add)
544 result = driver->ops.add(device);
546 device->driver = NULL;
547 acpi_driver_data(device) = NULL;
551 device->driver = driver;
554 * TBD - Configuration Management: Assign resources to device based
555 * upon possible configuration and currently allocated resources.
558 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
559 "Driver successfully bound to device\n"));
563 static int acpi_start_single_object(struct acpi_device *device)
566 struct acpi_driver *driver;
569 if (!(driver = device->driver))
572 if (driver->ops.start) {
573 result = driver->ops.start(device);
574 if (result && driver->ops.remove)
575 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
582 * acpi_bus_register_driver - register a driver with the ACPI bus
583 * @driver: driver being registered
585 * Registers a driver with the ACPI bus. Searches the namespace for all
586 * devices that match the driver's criteria and binds. Returns zero for
587 * success or a negative error status for failure.
589 int acpi_bus_register_driver(struct acpi_driver *driver)
595 driver->drv.name = driver->name;
596 driver->drv.bus = &acpi_bus_type;
597 driver->drv.owner = driver->owner;
599 ret = driver_register(&driver->drv);
603 EXPORT_SYMBOL(acpi_bus_register_driver);
606 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
607 * @driver: driver to unregister
609 * Unregisters a driver with the ACPI bus. Searches the namespace for all
610 * devices that match the driver's criteria and unbinds.
612 void acpi_bus_unregister_driver(struct acpi_driver *driver)
614 driver_unregister(&driver->drv);
617 EXPORT_SYMBOL(acpi_bus_unregister_driver);
619 /* --------------------------------------------------------------------------
621 -------------------------------------------------------------------------- */
623 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
627 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
628 union acpi_object *obj;
630 status = acpi_get_handle(handle, "_EJD", &tmp);
631 if (ACPI_FAILURE(status))
634 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
635 if (ACPI_SUCCESS(status)) {
636 obj = buffer.pointer;
637 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
639 kfree(buffer.pointer);
643 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
645 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
653 static int acpi_bus_get_perf_flags(struct acpi_device *device)
655 device->performance.state = ACPI_STATE_UNKNOWN;
660 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
661 union acpi_object *package)
664 union acpi_object *element = NULL;
666 if (!device || !package || (package->package.count < 2))
667 return AE_BAD_PARAMETER;
669 element = &(package->package.elements[0]);
671 return AE_BAD_PARAMETER;
672 if (element->type == ACPI_TYPE_PACKAGE) {
673 if ((element->package.count < 2) ||
674 (element->package.elements[0].type !=
675 ACPI_TYPE_LOCAL_REFERENCE)
676 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
678 device->wakeup.gpe_device =
679 element->package.elements[0].reference.handle;
680 device->wakeup.gpe_number =
681 (u32) element->package.elements[1].integer.value;
682 } else if (element->type == ACPI_TYPE_INTEGER) {
683 device->wakeup.gpe_number = element->integer.value;
687 element = &(package->package.elements[1]);
688 if (element->type != ACPI_TYPE_INTEGER) {
691 device->wakeup.sleep_state = element->integer.value;
693 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
696 device->wakeup.resources.count = package->package.count - 2;
697 for (i = 0; i < device->wakeup.resources.count; i++) {
698 element = &(package->package.elements[i + 2]);
699 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
702 device->wakeup.resources.handles[i] = element->reference.handle;
708 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
710 acpi_status status = 0;
711 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
712 union acpi_object *package = NULL;
715 struct acpi_device_id button_device_ids[] = {
723 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
724 if (ACPI_FAILURE(status)) {
725 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
729 package = (union acpi_object *)buffer.pointer;
730 status = acpi_bus_extract_wakeup_device_power_package(device, package);
731 if (ACPI_FAILURE(status)) {
732 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
736 kfree(buffer.pointer);
738 device->wakeup.flags.valid = 1;
739 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
740 * system for the ACPI device with the _PRW object.
741 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
742 * So it is necessary to call _DSW object first. Only when it is not
743 * present will the _PSW object used.
745 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
747 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
748 "error in _DSW or _PSW evaluation\n"));
750 /* Power button, Lid switch always enable wakeup */
751 if (!acpi_match_device_ids(device, button_device_ids))
752 device->wakeup.flags.run_wake = 1;
755 if (ACPI_FAILURE(status))
756 device->flags.wake_capable = 0;
760 static int acpi_bus_get_power_flags(struct acpi_device *device)
762 acpi_status status = 0;
763 acpi_handle handle = NULL;
768 * Power Management Flags
770 status = acpi_get_handle(device->handle, "_PSC", &handle);
771 if (ACPI_SUCCESS(status))
772 device->power.flags.explicit_get = 1;
773 status = acpi_get_handle(device->handle, "_IRC", &handle);
774 if (ACPI_SUCCESS(status))
775 device->power.flags.inrush_current = 1;
778 * Enumerate supported power management states
780 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
781 struct acpi_device_power_state *ps = &device->power.states[i];
782 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
784 /* Evaluate "_PRx" to se if power resources are referenced */
785 acpi_evaluate_reference(device->handle, object_name, NULL,
787 if (ps->resources.count) {
788 device->power.flags.power_resources = 1;
792 /* Evaluate "_PSx" to see if we can do explicit sets */
793 object_name[2] = 'S';
794 status = acpi_get_handle(device->handle, object_name, &handle);
795 if (ACPI_SUCCESS(status)) {
796 ps->flags.explicit_set = 1;
800 /* State is valid if we have some power control */
801 if (ps->resources.count || ps->flags.explicit_set)
804 ps->power = -1; /* Unknown - driver assigned */
805 ps->latency = -1; /* Unknown - driver assigned */
808 /* Set defaults for D0 and D3 states (always valid) */
809 device->power.states[ACPI_STATE_D0].flags.valid = 1;
810 device->power.states[ACPI_STATE_D0].power = 100;
811 device->power.states[ACPI_STATE_D3].flags.valid = 1;
812 device->power.states[ACPI_STATE_D3].power = 0;
814 /* TBD: System wake support and resource requirements. */
816 device->power.state = ACPI_STATE_UNKNOWN;
817 acpi_bus_get_power(device->handle, &(device->power.state));
822 static int acpi_bus_get_flags(struct acpi_device *device)
824 acpi_status status = AE_OK;
825 acpi_handle temp = NULL;
828 /* Presence of _STA indicates 'dynamic_status' */
829 status = acpi_get_handle(device->handle, "_STA", &temp);
830 if (ACPI_SUCCESS(status))
831 device->flags.dynamic_status = 1;
833 /* Presence of _CID indicates 'compatible_ids' */
834 status = acpi_get_handle(device->handle, "_CID", &temp);
835 if (ACPI_SUCCESS(status))
836 device->flags.compatible_ids = 1;
838 /* Presence of _RMV indicates 'removable' */
839 status = acpi_get_handle(device->handle, "_RMV", &temp);
840 if (ACPI_SUCCESS(status))
841 device->flags.removable = 1;
843 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
844 status = acpi_get_handle(device->handle, "_EJD", &temp);
845 if (ACPI_SUCCESS(status))
846 device->flags.ejectable = 1;
848 status = acpi_get_handle(device->handle, "_EJ0", &temp);
849 if (ACPI_SUCCESS(status))
850 device->flags.ejectable = 1;
853 /* Presence of _LCK indicates 'lockable' */
854 status = acpi_get_handle(device->handle, "_LCK", &temp);
855 if (ACPI_SUCCESS(status))
856 device->flags.lockable = 1;
858 /* Presence of _PS0|_PR0 indicates 'power manageable' */
859 status = acpi_get_handle(device->handle, "_PS0", &temp);
860 if (ACPI_FAILURE(status))
861 status = acpi_get_handle(device->handle, "_PR0", &temp);
862 if (ACPI_SUCCESS(status))
863 device->flags.power_manageable = 1;
865 /* Presence of _PRW indicates wake capable */
866 status = acpi_get_handle(device->handle, "_PRW", &temp);
867 if (ACPI_SUCCESS(status))
868 device->flags.wake_capable = 1;
870 /* TBD: Performance management */
875 static void acpi_device_get_busid(struct acpi_device *device,
876 acpi_handle handle, int type)
878 char bus_id[5] = { '?', 0 };
879 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
885 * The device's Bus ID is simply the object name.
886 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
889 case ACPI_BUS_TYPE_SYSTEM:
890 strcpy(device->pnp.bus_id, "ACPI");
892 case ACPI_BUS_TYPE_POWER_BUTTON:
893 strcpy(device->pnp.bus_id, "PWRF");
895 case ACPI_BUS_TYPE_SLEEP_BUTTON:
896 strcpy(device->pnp.bus_id, "SLPF");
899 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
900 /* Clean up trailing underscores (if any) */
901 for (i = 3; i > 1; i--) {
902 if (bus_id[i] == '_')
907 strcpy(device->pnp.bus_id, bus_id);
913 acpi_video_bus_match(struct acpi_device *device)
920 /* Since there is no HID, CID for ACPI Video drivers, we have
921 * to check well known required nodes for each feature we support.
924 /* Does this device able to support video switching ? */
925 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) &&
926 ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy)))
929 /* Does this device able to retrieve a video ROM ? */
930 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy)))
933 /* Does this device able to configure which video head to be POSTed ? */
934 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy)) &&
935 ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy)) &&
936 ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy)))
943 * acpi_bay_match - see if a device is an ejectable driver bay
945 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
946 * then we can safely call it an ejectable drive bay
948 static int acpi_bay_match(struct acpi_device *device){
954 handle = device->handle;
956 status = acpi_get_handle(handle, "_EJ0", &tmp);
957 if (ACPI_FAILURE(status))
960 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
961 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
962 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
963 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
966 if (acpi_get_parent(handle, &phandle))
969 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
970 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
971 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
972 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
979 * acpi_dock_match - see if a device has a _DCK method
981 static int acpi_dock_match(struct acpi_device *device)
984 return acpi_get_handle(device->handle, "_DCK", &tmp);
987 static void acpi_device_set_id(struct acpi_device *device,
988 struct acpi_device *parent, acpi_handle handle,
991 struct acpi_device_info *info;
992 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
995 struct acpi_compatible_id_list *cid_list = NULL;
996 const char *cid_add = NULL;
1000 case ACPI_BUS_TYPE_DEVICE:
1001 status = acpi_get_object_info(handle, &buffer);
1002 if (ACPI_FAILURE(status)) {
1003 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1007 info = buffer.pointer;
1008 if (info->valid & ACPI_VALID_HID)
1009 hid = info->hardware_id.value;
1010 if (info->valid & ACPI_VALID_UID)
1011 uid = info->unique_id.value;
1012 if (info->valid & ACPI_VALID_CID)
1013 cid_list = &info->compatibility_id;
1014 if (info->valid & ACPI_VALID_ADR) {
1015 device->pnp.bus_address = info->address;
1016 device->flags.bus_address = 1;
1019 /* If we have a video/bay/dock device, add our selfdefined
1020 HID to the CID list. Like that the video/bay/dock drivers
1021 will get autoloaded and the device might still match
1022 against another driver.
1024 if (ACPI_SUCCESS(acpi_video_bus_match(device)))
1025 cid_add = ACPI_VIDEO_HID;
1026 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1027 cid_add = ACPI_BAY_HID;
1028 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1029 cid_add = ACPI_DOCK_HID;
1032 case ACPI_BUS_TYPE_POWER:
1033 hid = ACPI_POWER_HID;
1035 case ACPI_BUS_TYPE_PROCESSOR:
1036 hid = ACPI_PROCESSOR_HID;
1038 case ACPI_BUS_TYPE_SYSTEM:
1039 hid = ACPI_SYSTEM_HID;
1041 case ACPI_BUS_TYPE_THERMAL:
1042 hid = ACPI_THERMAL_HID;
1044 case ACPI_BUS_TYPE_POWER_BUTTON:
1045 hid = ACPI_BUTTON_HID_POWERF;
1047 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1048 hid = ACPI_BUTTON_HID_SLEEPF;
1055 * Fix for the system root bus device -- the only root-level device.
1057 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1059 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1060 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1064 strcpy(device->pnp.hardware_id, hid);
1065 device->flags.hardware_id = 1;
1068 strcpy(device->pnp.unique_id, uid);
1069 device->flags.unique_id = 1;
1071 if (cid_list || cid_add) {
1072 struct acpi_compatible_id_list *list;
1077 size = cid_list->size;
1078 } else if (cid_add) {
1079 size = sizeof(struct acpi_compatible_id_list);
1080 cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1082 printk(KERN_ERR "Memory allocation error\n");
1083 kfree(buffer.pointer);
1086 cid_list->count = 0;
1087 cid_list->size = size;
1091 size += sizeof(struct acpi_compatible_id);
1092 list = kmalloc(size, GFP_KERNEL);
1096 memcpy(list, cid_list, cid_list->size);
1097 count = cid_list->count;
1100 strncpy(list->id[count].value, cid_add,
1101 ACPI_MAX_CID_LENGTH);
1103 device->flags.compatible_ids = 1;
1106 list->count = count;
1107 device->pnp.cid_list = list;
1109 printk(KERN_ERR PREFIX "Memory allocation error\n");
1112 kfree(buffer.pointer);
1115 static int acpi_device_set_context(struct acpi_device *device, int type)
1117 acpi_status status = AE_OK;
1122 * Attach this 'struct acpi_device' to the ACPI object. This makes
1123 * resolutions from handle->device very efficient. Note that we need
1124 * to be careful with fixed-feature devices as they all attach to the
1127 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1128 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1129 status = acpi_attach_data(device->handle,
1130 acpi_bus_data_handler, device);
1132 if (ACPI_FAILURE(status)) {
1133 printk(KERN_ERR PREFIX "Error attaching device data\n");
1140 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1145 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1146 device_release_driver(&dev->dev);
1152 * unbind _ADR-Based Devices when hot removal
1154 if (dev->flags.bus_address) {
1155 if ((dev->parent) && (dev->parent->ops.unbind))
1156 dev->parent->ops.unbind(dev);
1158 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1164 acpi_add_single_object(struct acpi_device **child,
1165 struct acpi_device *parent, acpi_handle handle, int type,
1166 struct acpi_bus_ops *ops)
1169 struct acpi_device *device = NULL;
1175 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1177 printk(KERN_ERR PREFIX "Memory allocation error\n");
1181 device->handle = handle;
1182 device->parent = parent;
1183 device->bus_ops = *ops; /* workround for not call .start */
1186 acpi_device_get_busid(device, handle, type);
1191 * Get prior to calling acpi_bus_get_status() so we know whether
1192 * or not _STA is present. Note that we only look for object
1193 * handles -- cannot evaluate objects until we know the device is
1194 * present and properly initialized.
1196 result = acpi_bus_get_flags(device);
1203 * See if the device is present. We always assume that non-Device
1204 * and non-Processor objects (e.g. thermal zones, power resources,
1205 * etc.) are present, functioning, etc. (at least when parent object
1206 * is present). Note that _STA has a different meaning for some
1207 * objects (e.g. power resources) so we need to be careful how we use
1211 case ACPI_BUS_TYPE_PROCESSOR:
1212 case ACPI_BUS_TYPE_DEVICE:
1213 result = acpi_bus_get_status(device);
1214 if (ACPI_FAILURE(result)) {
1219 * When the device is neither present nor functional, the
1220 * device should not be added to Linux ACPI device tree.
1221 * When the status of the device is not present but functinal,
1222 * it should be added to Linux ACPI tree. For example : bay
1223 * device , dock device.
1224 * In such conditions it is unncessary to check whether it is
1225 * bay device or dock device.
1227 if (!device->status.present && !device->status.functional) {
1233 STRUCT_TO_INT(device->status) =
1234 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1235 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
1242 * TBD: Synch with Core's enumeration/initialization process.
1246 * Hardware ID, Unique ID, & Bus Address
1247 * -------------------------------------
1249 acpi_device_set_id(device, parent, handle, type);
1252 * The ACPI device is attached to acpi handle before getting
1253 * the power/wakeup/peformance flags. Otherwise OS can't get
1254 * the corresponding ACPI device by the acpi handle in the course
1255 * of getting the power/wakeup/performance flags.
1257 result = acpi_device_set_context(device, type);
1265 if (device->flags.power_manageable) {
1266 result = acpi_bus_get_power_flags(device);
1272 * Wakeup device management
1273 *-----------------------
1275 if (device->flags.wake_capable) {
1276 result = acpi_bus_get_wakeup_device_flags(device);
1282 * Performance Management
1283 * ----------------------
1285 if (device->flags.performance_manageable) {
1286 result = acpi_bus_get_perf_flags(device);
1292 result = acpi_device_register(device, parent);
1295 * Bind _ADR-Based Devices when hot add
1297 if (device->flags.bus_address) {
1298 if (device->parent && device->parent->ops.bind)
1299 device->parent->ops.bind(device);
1306 kfree(device->pnp.cid_list);
1313 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1315 acpi_status status = AE_OK;
1316 struct acpi_device *parent = NULL;
1317 struct acpi_device *child = NULL;
1318 acpi_handle phandle = NULL;
1319 acpi_handle chandle = NULL;
1320 acpi_object_type type = 0;
1328 phandle = start->handle;
1331 * Parse through the ACPI namespace, identify all 'devices', and
1332 * create a new 'struct acpi_device' for each.
1334 while ((level > 0) && parent) {
1336 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1340 * If this scope is exhausted then move our way back up.
1342 if (ACPI_FAILURE(status)) {
1345 acpi_get_parent(phandle, &phandle);
1347 parent = parent->parent;
1351 status = acpi_get_type(chandle, &type);
1352 if (ACPI_FAILURE(status))
1356 * If this is a scope object then parse it (depth-first).
1358 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1366 * We're only interested in objects that we consider 'devices'.
1369 case ACPI_TYPE_DEVICE:
1370 type = ACPI_BUS_TYPE_DEVICE;
1372 case ACPI_TYPE_PROCESSOR:
1373 type = ACPI_BUS_TYPE_PROCESSOR;
1375 case ACPI_TYPE_THERMAL:
1376 type = ACPI_BUS_TYPE_THERMAL;
1378 case ACPI_TYPE_POWER:
1379 type = ACPI_BUS_TYPE_POWER;
1385 if (ops->acpi_op_add)
1386 status = acpi_add_single_object(&child, parent,
1387 chandle, type, ops);
1389 status = acpi_bus_get_device(chandle, &child);
1391 if (ACPI_FAILURE(status))
1394 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1395 status = acpi_start_single_object(child);
1396 if (ACPI_FAILURE(status))
1401 * If the device is present, enabled, and functioning then
1402 * parse its scope (depth-first). Note that we need to
1403 * represent absent devices to facilitate PnP notifications
1404 * -- but only the subtree head (not all of its children,
1405 * which will be enumerated when the parent is inserted).
1407 * TBD: Need notifications and other detection mechanisms
1408 * in place before we can fully implement this.
1411 * When the device is not present but functional, it is also
1412 * necessary to scan the children of this device.
1414 if (child->status.present || (!child->status.present &&
1415 child->status.functional)) {
1416 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1418 if (ACPI_SUCCESS(status)) {
1431 acpi_bus_add(struct acpi_device **child,
1432 struct acpi_device *parent, acpi_handle handle, int type)
1435 struct acpi_bus_ops ops;
1437 memset(&ops, 0, sizeof(ops));
1438 ops.acpi_op_add = 1;
1440 result = acpi_add_single_object(child, parent, handle, type, &ops);
1442 result = acpi_bus_scan(*child, &ops);
1447 EXPORT_SYMBOL(acpi_bus_add);
1449 int acpi_bus_start(struct acpi_device *device)
1452 struct acpi_bus_ops ops;
1458 result = acpi_start_single_object(device);
1460 memset(&ops, 0, sizeof(ops));
1461 ops.acpi_op_start = 1;
1462 result = acpi_bus_scan(device, &ops);
1467 EXPORT_SYMBOL(acpi_bus_start);
1469 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1472 struct acpi_device *parent, *child;
1473 acpi_handle phandle, chandle;
1474 acpi_object_type type;
1479 phandle = start->handle;
1480 child = chandle = NULL;
1482 while ((level > 0) && parent && (!err)) {
1483 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1487 * If this scope is exhausted then move our way back up.
1489 if (ACPI_FAILURE(status)) {
1492 acpi_get_parent(phandle, &phandle);
1494 parent = parent->parent;
1497 err = acpi_bus_remove(child, rmdevice);
1499 err = acpi_bus_remove(child, 1);
1504 status = acpi_get_type(chandle, &type);
1505 if (ACPI_FAILURE(status)) {
1509 * If there is a device corresponding to chandle then
1510 * parse it (depth-first).
1512 if (acpi_bus_get_device(chandle, &child) == 0) {
1522 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1525 static int acpi_bus_scan_fixed(struct acpi_device *root)
1528 struct acpi_device *device = NULL;
1529 struct acpi_bus_ops ops;
1534 memset(&ops, 0, sizeof(ops));
1535 ops.acpi_op_add = 1;
1536 ops.acpi_op_start = 1;
1539 * Enumerate all fixed-feature devices.
1541 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1542 result = acpi_add_single_object(&device, acpi_root,
1544 ACPI_BUS_TYPE_POWER_BUTTON,
1548 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1549 result = acpi_add_single_object(&device, acpi_root,
1551 ACPI_BUS_TYPE_SLEEP_BUTTON,
1558 int __init acpi_boot_ec_enable(void);
1560 static int __init acpi_scan_init(void)
1563 struct acpi_bus_ops ops;
1569 memset(&ops, 0, sizeof(ops));
1570 ops.acpi_op_add = 1;
1571 ops.acpi_op_start = 1;
1573 result = bus_register(&acpi_bus_type);
1575 /* We don't want to quit even if we failed to add suspend/resume */
1576 printk(KERN_ERR PREFIX "Could not register bus type\n");
1580 * Create the root device in the bus's device tree
1582 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1583 ACPI_BUS_TYPE_SYSTEM, &ops);
1588 * Enumerate devices in the ACPI namespace.
1590 result = acpi_bus_scan_fixed(acpi_root);
1592 /* EC region might be needed at bus_scan, so enable it now */
1593 acpi_boot_ec_enable();
1596 result = acpi_bus_scan(acpi_root, &ops);
1599 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1605 subsys_initcall(acpi_scan_init);