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 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
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;
279 if (device->flags.hardware_id) {
280 for (id = ids; id->id[0]; id++) {
281 if (!strcmp((char*)id->id, device->pnp.hardware_id))
286 if (device->flags.compatible_ids) {
287 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
290 for (id = ids; id->id[0]; id++) {
291 /* compare multiple _CID entries against driver ids */
292 for (i = 0; i < cid_list->count; i++) {
293 if (!strcmp((char*)id->id,
294 cid_list->id[i].value))
302 EXPORT_SYMBOL(acpi_match_device_ids);
304 static void acpi_device_release(struct device *dev)
306 struct acpi_device *acpi_dev = to_acpi_device(dev);
308 kfree(acpi_dev->pnp.cid_list);
312 static int acpi_device_suspend(struct device *dev, pm_message_t state)
314 struct acpi_device *acpi_dev = to_acpi_device(dev);
315 struct acpi_driver *acpi_drv = acpi_dev->driver;
317 if (acpi_drv && acpi_drv->ops.suspend)
318 return acpi_drv->ops.suspend(acpi_dev, state);
322 static int acpi_device_resume(struct device *dev)
324 struct acpi_device *acpi_dev = to_acpi_device(dev);
325 struct acpi_driver *acpi_drv = acpi_dev->driver;
327 if (acpi_drv && acpi_drv->ops.resume)
328 return acpi_drv->ops.resume(acpi_dev);
332 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
334 struct acpi_device *acpi_dev = to_acpi_device(dev);
335 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
337 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
340 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
342 struct acpi_device *acpi_dev = to_acpi_device(dev);
345 if (add_uevent_var(env, "MODALIAS="))
347 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
348 sizeof(env->buf) - env->buflen);
349 if (len >= (sizeof(env->buf) - env->buflen))
355 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
356 static int acpi_start_single_object(struct acpi_device *);
357 static int acpi_device_probe(struct device * dev)
359 struct acpi_device *acpi_dev = to_acpi_device(dev);
360 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
363 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
365 if (acpi_dev->bus_ops.acpi_op_start)
366 acpi_start_single_object(acpi_dev);
367 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
368 "Found driver [%s] for device [%s]\n",
369 acpi_drv->name, acpi_dev->pnp.bus_id));
375 static int acpi_device_remove(struct device * dev)
377 struct acpi_device *acpi_dev = to_acpi_device(dev);
378 struct acpi_driver *acpi_drv = acpi_dev->driver;
381 if (acpi_drv->ops.stop)
382 acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
383 if (acpi_drv->ops.remove)
384 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
386 acpi_dev->driver = NULL;
387 acpi_driver_data(dev) = NULL;
393 static void acpi_device_shutdown(struct device *dev)
395 struct acpi_device *acpi_dev = to_acpi_device(dev);
396 struct acpi_driver *acpi_drv = acpi_dev->driver;
398 if (acpi_drv && acpi_drv->ops.shutdown)
399 acpi_drv->ops.shutdown(acpi_dev);
404 struct bus_type acpi_bus_type = {
406 .suspend = acpi_device_suspend,
407 .resume = acpi_device_resume,
408 .shutdown = acpi_device_shutdown,
409 .match = acpi_bus_match,
410 .probe = acpi_device_probe,
411 .remove = acpi_device_remove,
412 .uevent = acpi_device_uevent,
415 static int acpi_device_register(struct acpi_device *device,
416 struct acpi_device *parent)
419 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
424 * Link this device to its parent and siblings.
426 INIT_LIST_HEAD(&device->children);
427 INIT_LIST_HEAD(&device->node);
428 INIT_LIST_HEAD(&device->g_list);
429 INIT_LIST_HEAD(&device->wakeup_list);
431 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
433 printk(KERN_ERR PREFIX "Memory allocation error\n");
437 spin_lock(&acpi_device_lock);
439 * Find suitable bus_id and instance number in acpi_bus_id_list
440 * If failed, create one and link it into acpi_bus_id_list
442 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
443 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
444 acpi_device_bus_id->instance_no ++;
451 acpi_device_bus_id = new_bus_id;
452 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
453 acpi_device_bus_id->instance_no = 0;
454 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
456 sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
458 if (device->parent) {
459 list_add_tail(&device->node, &device->parent->children);
460 list_add_tail(&device->g_list, &device->parent->g_list);
462 list_add_tail(&device->g_list, &acpi_device_list);
463 if (device->wakeup.flags.valid)
464 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
465 spin_unlock(&acpi_device_lock);
468 device->dev.parent = &parent->dev;
469 device->dev.bus = &acpi_bus_type;
470 device_initialize(&device->dev);
471 device->dev.release = &acpi_device_release;
472 result = device_add(&device->dev);
474 dev_err(&device->dev, "Error adding device\n");
478 result = acpi_device_setup_files(device);
480 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id));
482 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
485 spin_lock(&acpi_device_lock);
486 if (device->parent) {
487 list_del(&device->node);
488 list_del(&device->g_list);
490 list_del(&device->g_list);
491 list_del(&device->wakeup_list);
492 spin_unlock(&acpi_device_lock);
496 static void acpi_device_unregister(struct acpi_device *device, int type)
498 spin_lock(&acpi_device_lock);
499 if (device->parent) {
500 list_del(&device->node);
501 list_del(&device->g_list);
503 list_del(&device->g_list);
505 list_del(&device->wakeup_list);
506 spin_unlock(&acpi_device_lock);
508 acpi_detach_data(device->handle, acpi_bus_data_handler);
510 acpi_device_remove_files(device);
511 device_unregister(&device->dev);
514 /* --------------------------------------------------------------------------
516 -------------------------------------------------------------------------- */
518 * acpi_bus_driver_init - add a device to a driver
519 * @device: the device to add and initialize
520 * @driver: driver for the device
522 * Used to initialize a device via its device driver. Called whenever a
523 * driver is bound to a device. Invokes the driver's add() ops.
526 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
531 if (!device || !driver)
534 if (!driver->ops.add)
537 result = driver->ops.add(device);
539 device->driver = NULL;
540 acpi_driver_data(device) = NULL;
544 device->driver = driver;
547 * TBD - Configuration Management: Assign resources to device based
548 * upon possible configuration and currently allocated resources.
551 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
552 "Driver successfully bound to device\n"));
556 static int acpi_start_single_object(struct acpi_device *device)
559 struct acpi_driver *driver;
562 if (!(driver = device->driver))
565 if (driver->ops.start) {
566 result = driver->ops.start(device);
567 if (result && driver->ops.remove)
568 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
575 * acpi_bus_register_driver - register a driver with the ACPI bus
576 * @driver: driver being registered
578 * Registers a driver with the ACPI bus. Searches the namespace for all
579 * devices that match the driver's criteria and binds. Returns zero for
580 * success or a negative error status for failure.
582 int acpi_bus_register_driver(struct acpi_driver *driver)
588 driver->drv.name = driver->name;
589 driver->drv.bus = &acpi_bus_type;
590 driver->drv.owner = driver->owner;
592 ret = driver_register(&driver->drv);
596 EXPORT_SYMBOL(acpi_bus_register_driver);
599 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
600 * @driver: driver to unregister
602 * Unregisters a driver with the ACPI bus. Searches the namespace for all
603 * devices that match the driver's criteria and unbinds.
605 void acpi_bus_unregister_driver(struct acpi_driver *driver)
607 driver_unregister(&driver->drv);
610 EXPORT_SYMBOL(acpi_bus_unregister_driver);
612 /* --------------------------------------------------------------------------
614 -------------------------------------------------------------------------- */
616 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
620 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
621 union acpi_object *obj;
623 status = acpi_get_handle(handle, "_EJD", &tmp);
624 if (ACPI_FAILURE(status))
627 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
628 if (ACPI_SUCCESS(status)) {
629 obj = buffer.pointer;
630 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
632 kfree(buffer.pointer);
636 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
638 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
646 static int acpi_bus_get_perf_flags(struct acpi_device *device)
648 device->performance.state = ACPI_STATE_UNKNOWN;
653 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
654 union acpi_object *package)
657 union acpi_object *element = NULL;
659 if (!device || !package || (package->package.count < 2))
660 return AE_BAD_PARAMETER;
662 element = &(package->package.elements[0]);
664 return AE_BAD_PARAMETER;
665 if (element->type == ACPI_TYPE_PACKAGE) {
666 if ((element->package.count < 2) ||
667 (element->package.elements[0].type !=
668 ACPI_TYPE_LOCAL_REFERENCE)
669 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
671 device->wakeup.gpe_device =
672 element->package.elements[0].reference.handle;
673 device->wakeup.gpe_number =
674 (u32) element->package.elements[1].integer.value;
675 } else if (element->type == ACPI_TYPE_INTEGER) {
676 device->wakeup.gpe_number = element->integer.value;
680 element = &(package->package.elements[1]);
681 if (element->type != ACPI_TYPE_INTEGER) {
684 device->wakeup.sleep_state = element->integer.value;
686 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
689 device->wakeup.resources.count = package->package.count - 2;
690 for (i = 0; i < device->wakeup.resources.count; i++) {
691 element = &(package->package.elements[i + 2]);
692 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
695 device->wakeup.resources.handles[i] = element->reference.handle;
701 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
703 acpi_status status = 0;
704 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
705 union acpi_object *package = NULL;
708 struct acpi_device_id button_device_ids[] = {
716 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
717 if (ACPI_FAILURE(status)) {
718 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
722 package = (union acpi_object *)buffer.pointer;
723 status = acpi_bus_extract_wakeup_device_power_package(device, package);
724 if (ACPI_FAILURE(status)) {
725 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
729 kfree(buffer.pointer);
731 device->wakeup.flags.valid = 1;
732 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
733 * system for the ACPI device with the _PRW object.
734 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
735 * So it is necessary to call _DSW object first. Only when it is not
736 * present will the _PSW object used.
738 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
740 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
741 "error in _DSW or _PSW evaluation\n"));
743 /* Power button, Lid switch always enable wakeup */
744 if (!acpi_match_device_ids(device, button_device_ids))
745 device->wakeup.flags.run_wake = 1;
748 * Don't set Power button GPE as run_wake
749 * if Fixed Power button is used
751 if (!strcmp(device->pnp.hardware_id, "PNP0C0C") &&
752 !(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
753 device->wakeup.flags.run_wake = 0;
754 device->wakeup.flags.valid = 0;
758 if (ACPI_FAILURE(status))
759 device->flags.wake_capable = 0;
763 static int acpi_bus_get_power_flags(struct acpi_device *device)
765 acpi_status status = 0;
766 acpi_handle handle = NULL;
771 * Power Management Flags
773 status = acpi_get_handle(device->handle, "_PSC", &handle);
774 if (ACPI_SUCCESS(status))
775 device->power.flags.explicit_get = 1;
776 status = acpi_get_handle(device->handle, "_IRC", &handle);
777 if (ACPI_SUCCESS(status))
778 device->power.flags.inrush_current = 1;
781 * Enumerate supported power management states
783 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
784 struct acpi_device_power_state *ps = &device->power.states[i];
785 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
787 /* Evaluate "_PRx" to se if power resources are referenced */
788 acpi_evaluate_reference(device->handle, object_name, NULL,
790 if (ps->resources.count) {
791 device->power.flags.power_resources = 1;
795 /* Evaluate "_PSx" to see if we can do explicit sets */
796 object_name[2] = 'S';
797 status = acpi_get_handle(device->handle, object_name, &handle);
798 if (ACPI_SUCCESS(status)) {
799 ps->flags.explicit_set = 1;
803 /* State is valid if we have some power control */
804 if (ps->resources.count || ps->flags.explicit_set)
807 ps->power = -1; /* Unknown - driver assigned */
808 ps->latency = -1; /* Unknown - driver assigned */
811 /* Set defaults for D0 and D3 states (always valid) */
812 device->power.states[ACPI_STATE_D0].flags.valid = 1;
813 device->power.states[ACPI_STATE_D0].power = 100;
814 device->power.states[ACPI_STATE_D3].flags.valid = 1;
815 device->power.states[ACPI_STATE_D3].power = 0;
817 /* TBD: System wake support and resource requirements. */
819 device->power.state = ACPI_STATE_UNKNOWN;
824 static int acpi_bus_get_flags(struct acpi_device *device)
826 acpi_status status = AE_OK;
827 acpi_handle temp = NULL;
830 /* Presence of _STA indicates 'dynamic_status' */
831 status = acpi_get_handle(device->handle, "_STA", &temp);
832 if (ACPI_SUCCESS(status))
833 device->flags.dynamic_status = 1;
835 /* Presence of _CID indicates 'compatible_ids' */
836 status = acpi_get_handle(device->handle, "_CID", &temp);
837 if (ACPI_SUCCESS(status))
838 device->flags.compatible_ids = 1;
840 /* Presence of _RMV indicates 'removable' */
841 status = acpi_get_handle(device->handle, "_RMV", &temp);
842 if (ACPI_SUCCESS(status))
843 device->flags.removable = 1;
845 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
846 status = acpi_get_handle(device->handle, "_EJD", &temp);
847 if (ACPI_SUCCESS(status))
848 device->flags.ejectable = 1;
850 status = acpi_get_handle(device->handle, "_EJ0", &temp);
851 if (ACPI_SUCCESS(status))
852 device->flags.ejectable = 1;
855 /* Presence of _LCK indicates 'lockable' */
856 status = acpi_get_handle(device->handle, "_LCK", &temp);
857 if (ACPI_SUCCESS(status))
858 device->flags.lockable = 1;
860 /* Presence of _PS0|_PR0 indicates 'power manageable' */
861 status = acpi_get_handle(device->handle, "_PS0", &temp);
862 if (ACPI_FAILURE(status))
863 status = acpi_get_handle(device->handle, "_PR0", &temp);
864 if (ACPI_SUCCESS(status))
865 device->flags.power_manageable = 1;
867 /* Presence of _PRW indicates wake capable */
868 status = acpi_get_handle(device->handle, "_PRW", &temp);
869 if (ACPI_SUCCESS(status))
870 device->flags.wake_capable = 1;
872 /* TBD: Performance management */
877 static void acpi_device_get_busid(struct acpi_device *device,
878 acpi_handle handle, int type)
880 char bus_id[5] = { '?', 0 };
881 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
887 * The device's Bus ID is simply the object name.
888 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
891 case ACPI_BUS_TYPE_SYSTEM:
892 strcpy(device->pnp.bus_id, "ACPI");
894 case ACPI_BUS_TYPE_POWER_BUTTON:
895 strcpy(device->pnp.bus_id, "PWRF");
897 case ACPI_BUS_TYPE_SLEEP_BUTTON:
898 strcpy(device->pnp.bus_id, "SLPF");
901 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
902 /* Clean up trailing underscores (if any) */
903 for (i = 3; i > 1; i--) {
904 if (bus_id[i] == '_')
909 strcpy(device->pnp.bus_id, bus_id);
915 acpi_video_bus_match(struct acpi_device *device)
922 /* Since there is no HID, CID for ACPI Video drivers, we have
923 * to check well known required nodes for each feature we support.
926 /* Does this device able to support video switching ? */
927 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) &&
928 ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy)))
931 /* Does this device able to retrieve a video ROM ? */
932 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy)))
935 /* Does this device able to configure which video head to be POSTed ? */
936 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy)) &&
937 ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy)) &&
938 ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy)))
945 * acpi_bay_match - see if a device is an ejectable driver bay
947 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
948 * then we can safely call it an ejectable drive bay
950 static int acpi_bay_match(struct acpi_device *device){
956 handle = device->handle;
958 status = acpi_get_handle(handle, "_EJ0", &tmp);
959 if (ACPI_FAILURE(status))
962 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
963 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
964 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
965 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
968 if (acpi_get_parent(handle, &phandle))
971 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
972 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
973 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
974 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
981 * acpi_dock_match - see if a device has a _DCK method
983 static int acpi_dock_match(struct acpi_device *device)
986 return acpi_get_handle(device->handle, "_DCK", &tmp);
989 static void acpi_device_set_id(struct acpi_device *device,
990 struct acpi_device *parent, acpi_handle handle,
993 struct acpi_device_info *info;
994 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
997 struct acpi_compatible_id_list *cid_list = NULL;
998 const char *cid_add = NULL;
1002 case ACPI_BUS_TYPE_DEVICE:
1003 status = acpi_get_object_info(handle, &buffer);
1004 if (ACPI_FAILURE(status)) {
1005 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1009 info = buffer.pointer;
1010 if (info->valid & ACPI_VALID_HID)
1011 hid = info->hardware_id.value;
1012 if (info->valid & ACPI_VALID_UID)
1013 uid = info->unique_id.value;
1014 if (info->valid & ACPI_VALID_CID)
1015 cid_list = &info->compatibility_id;
1016 if (info->valid & ACPI_VALID_ADR) {
1017 device->pnp.bus_address = info->address;
1018 device->flags.bus_address = 1;
1021 /* If we have a video/bay/dock device, add our selfdefined
1022 HID to the CID list. Like that the video/bay/dock drivers
1023 will get autoloaded and the device might still match
1024 against another driver.
1026 if (ACPI_SUCCESS(acpi_video_bus_match(device)))
1027 cid_add = ACPI_VIDEO_HID;
1028 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1029 cid_add = ACPI_BAY_HID;
1030 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1031 cid_add = ACPI_DOCK_HID;
1034 case ACPI_BUS_TYPE_POWER:
1035 hid = ACPI_POWER_HID;
1037 case ACPI_BUS_TYPE_PROCESSOR:
1038 hid = ACPI_PROCESSOR_HID;
1040 case ACPI_BUS_TYPE_SYSTEM:
1041 hid = ACPI_SYSTEM_HID;
1043 case ACPI_BUS_TYPE_THERMAL:
1044 hid = ACPI_THERMAL_HID;
1046 case ACPI_BUS_TYPE_POWER_BUTTON:
1047 hid = ACPI_BUTTON_HID_POWERF;
1049 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1050 hid = ACPI_BUTTON_HID_SLEEPF;
1057 * Fix for the system root bus device -- the only root-level device.
1059 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1061 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1062 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1066 strcpy(device->pnp.hardware_id, hid);
1067 device->flags.hardware_id = 1;
1070 strcpy(device->pnp.unique_id, uid);
1071 device->flags.unique_id = 1;
1073 if (cid_list || cid_add) {
1074 struct acpi_compatible_id_list *list;
1079 size = cid_list->size;
1080 } else if (cid_add) {
1081 size = sizeof(struct acpi_compatible_id_list);
1082 cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1084 printk(KERN_ERR "Memory allocation error\n");
1085 kfree(buffer.pointer);
1088 cid_list->count = 0;
1089 cid_list->size = size;
1093 size += sizeof(struct acpi_compatible_id);
1094 list = kmalloc(size, GFP_KERNEL);
1098 memcpy(list, cid_list, cid_list->size);
1099 count = cid_list->count;
1102 strncpy(list->id[count].value, cid_add,
1103 ACPI_MAX_CID_LENGTH);
1105 device->flags.compatible_ids = 1;
1108 list->count = count;
1109 device->pnp.cid_list = list;
1111 printk(KERN_ERR PREFIX "Memory allocation error\n");
1114 kfree(buffer.pointer);
1117 static int acpi_device_set_context(struct acpi_device *device, int type)
1119 acpi_status status = AE_OK;
1124 * Attach this 'struct acpi_device' to the ACPI object. This makes
1125 * resolutions from handle->device very efficient. Note that we need
1126 * to be careful with fixed-feature devices as they all attach to the
1129 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1130 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1131 status = acpi_attach_data(device->handle,
1132 acpi_bus_data_handler, device);
1134 if (ACPI_FAILURE(status)) {
1135 printk(KERN_ERR PREFIX "Error attaching device data\n");
1142 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1147 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1148 device_release_driver(&dev->dev);
1154 * unbind _ADR-Based Devices when hot removal
1156 if (dev->flags.bus_address) {
1157 if ((dev->parent) && (dev->parent->ops.unbind))
1158 dev->parent->ops.unbind(dev);
1160 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1166 acpi_is_child_device(struct acpi_device *device,
1167 int (*matcher)(struct acpi_device *))
1169 int result = -ENODEV;
1172 if (ACPI_SUCCESS(matcher(device)))
1174 } while ((device = device->parent));
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)) {
1234 if (!device->status.present) {
1235 /* Bay and dock should be handled even if absent */
1237 acpi_is_child_device(device, acpi_bay_match)) &&
1239 acpi_is_child_device(device, acpi_dock_match))) {
1246 STRUCT_TO_INT(device->status) =
1247 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1248 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
1255 * TBD: Synch with Core's enumeration/initialization process.
1259 * Hardware ID, Unique ID, & Bus Address
1260 * -------------------------------------
1262 acpi_device_set_id(device, parent, handle, type);
1268 if (device->flags.power_manageable) {
1269 result = acpi_bus_get_power_flags(device);
1275 * Wakeup device management
1276 *-----------------------
1278 if (device->flags.wake_capable) {
1279 result = acpi_bus_get_wakeup_device_flags(device);
1285 * Performance Management
1286 * ----------------------
1288 if (device->flags.performance_manageable) {
1289 result = acpi_bus_get_perf_flags(device);
1294 if ((result = acpi_device_set_context(device, type)))
1297 result = acpi_device_register(device, parent);
1300 * Bind _ADR-Based Devices when hot add
1302 if (device->flags.bus_address) {
1303 if (device->parent && device->parent->ops.bind)
1304 device->parent->ops.bind(device);
1311 kfree(device->pnp.cid_list);
1318 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1320 acpi_status status = AE_OK;
1321 struct acpi_device *parent = NULL;
1322 struct acpi_device *child = NULL;
1323 acpi_handle phandle = NULL;
1324 acpi_handle chandle = NULL;
1325 acpi_object_type type = 0;
1333 phandle = start->handle;
1336 * Parse through the ACPI namespace, identify all 'devices', and
1337 * create a new 'struct acpi_device' for each.
1339 while ((level > 0) && parent) {
1341 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1345 * If this scope is exhausted then move our way back up.
1347 if (ACPI_FAILURE(status)) {
1350 acpi_get_parent(phandle, &phandle);
1352 parent = parent->parent;
1356 status = acpi_get_type(chandle, &type);
1357 if (ACPI_FAILURE(status))
1361 * If this is a scope object then parse it (depth-first).
1363 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1371 * We're only interested in objects that we consider 'devices'.
1374 case ACPI_TYPE_DEVICE:
1375 type = ACPI_BUS_TYPE_DEVICE;
1377 case ACPI_TYPE_PROCESSOR:
1378 type = ACPI_BUS_TYPE_PROCESSOR;
1380 case ACPI_TYPE_THERMAL:
1381 type = ACPI_BUS_TYPE_THERMAL;
1383 case ACPI_TYPE_POWER:
1384 type = ACPI_BUS_TYPE_POWER;
1390 if (ops->acpi_op_add)
1391 status = acpi_add_single_object(&child, parent,
1392 chandle, type, ops);
1394 status = acpi_bus_get_device(chandle, &child);
1396 if (ACPI_FAILURE(status))
1399 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1400 status = acpi_start_single_object(child);
1401 if (ACPI_FAILURE(status))
1406 * If the device is present, enabled, and functioning then
1407 * parse its scope (depth-first). Note that we need to
1408 * represent absent devices to facilitate PnP notifications
1409 * -- but only the subtree head (not all of its children,
1410 * which will be enumerated when the parent is inserted).
1412 * TBD: Need notifications and other detection mechanisms
1413 * in place before we can fully implement this.
1415 if (child->status.present) {
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);