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/acpi.h>
9 #include <acpi/acpi_drivers.h>
10 #include <acpi/acinterp.h> /* for acpi_ex_eisa_id_to_string() */
12 #define _COMPONENT ACPI_BUS_COMPONENT
13 ACPI_MODULE_NAME("scan")
14 #define STRUCT_TO_INT(s) (*((int*)&s))
15 extern struct acpi_device *acpi_root;
17 #define ACPI_BUS_CLASS "system_bus"
18 #define ACPI_BUS_HID "ACPI_BUS"
19 #define ACPI_BUS_DRIVER_NAME "ACPI Bus Driver"
20 #define ACPI_BUS_DEVICE_NAME "System Bus"
22 static LIST_HEAD(acpi_device_list);
23 DEFINE_SPINLOCK(acpi_device_lock);
24 LIST_HEAD(acpi_wakeup_device_list);
27 static void acpi_device_release(struct kobject *kobj)
29 struct acpi_device *dev = container_of(kobj, struct acpi_device, kobj);
30 kfree(dev->pnp.cid_list);
34 struct acpi_device_attribute {
35 struct attribute attr;
36 ssize_t(*show) (struct acpi_device *, char *);
37 ssize_t(*store) (struct acpi_device *, const char *, size_t);
40 typedef void acpi_device_sysfs_files(struct kobject *,
41 const struct attribute *);
43 static void setup_sys_fs_device_files(struct acpi_device *dev,
44 acpi_device_sysfs_files * func);
46 #define create_sysfs_device_files(dev) \
47 setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file)
48 #define remove_sysfs_device_files(dev) \
49 setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file)
51 #define to_acpi_device(n) container_of(n, struct acpi_device, kobj)
52 #define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr);
54 static ssize_t acpi_device_attr_show(struct kobject *kobj,
55 struct attribute *attr, char *buf)
57 struct acpi_device *device = to_acpi_device(kobj);
58 struct acpi_device_attribute *attribute = to_handle_attr(attr);
59 return attribute->show ? attribute->show(device, buf) : -EIO;
61 static ssize_t acpi_device_attr_store(struct kobject *kobj,
62 struct attribute *attr, const char *buf,
65 struct acpi_device *device = to_acpi_device(kobj);
66 struct acpi_device_attribute *attribute = to_handle_attr(attr);
67 return attribute->store ? attribute->store(device, buf, len) : -EIO;
70 static struct sysfs_ops acpi_device_sysfs_ops = {
71 .show = acpi_device_attr_show,
72 .store = acpi_device_attr_store,
75 static struct kobj_type ktype_acpi_ns = {
76 .sysfs_ops = &acpi_device_sysfs_ops,
77 .release = acpi_device_release,
80 static int namespace_uevent(struct kset *kset, struct kobject *kobj,
81 char **envp, int num_envp, char *buffer,
84 struct acpi_device *dev = to_acpi_device(kobj);
91 if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
92 "PHYSDEVDRIVER=%s", dev->driver->name))
100 static struct kset_uevent_ops namespace_uevent_ops = {
101 .uevent = &namespace_uevent,
104 static struct kset acpi_namespace_kset = {
108 .subsys = &acpi_subsys,
109 .ktype = &ktype_acpi_ns,
110 .uevent_ops = &namespace_uevent_ops,
113 static void acpi_device_register(struct acpi_device *device,
114 struct acpi_device *parent)
119 * Link this device to its parent and siblings.
121 INIT_LIST_HEAD(&device->children);
122 INIT_LIST_HEAD(&device->node);
123 INIT_LIST_HEAD(&device->g_list);
124 INIT_LIST_HEAD(&device->wakeup_list);
126 spin_lock(&acpi_device_lock);
127 if (device->parent) {
128 list_add_tail(&device->node, &device->parent->children);
129 list_add_tail(&device->g_list, &device->parent->g_list);
131 list_add_tail(&device->g_list, &acpi_device_list);
132 if (device->wakeup.flags.valid)
133 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
134 spin_unlock(&acpi_device_lock);
136 strlcpy(device->kobj.name, device->pnp.bus_id, KOBJ_NAME_LEN);
138 device->kobj.parent = &parent->kobj;
139 device->kobj.ktype = &ktype_acpi_ns;
140 device->kobj.kset = &acpi_namespace_kset;
141 kobject_register(&device->kobj);
142 create_sysfs_device_files(device);
145 static void acpi_device_unregister(struct acpi_device *device, int type)
147 spin_lock(&acpi_device_lock);
148 if (device->parent) {
149 list_del(&device->node);
150 list_del(&device->g_list);
152 list_del(&device->g_list);
154 list_del(&device->wakeup_list);
156 spin_unlock(&acpi_device_lock);
158 acpi_detach_data(device->handle, acpi_bus_data_handler);
159 remove_sysfs_device_files(device);
160 kobject_unregister(&device->kobj);
163 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
165 ACPI_FUNCTION_TRACE("acpi_bus_data_handler");
172 static int acpi_bus_get_power_flags(struct acpi_device *device)
174 acpi_status status = 0;
175 acpi_handle handle = NULL;
178 ACPI_FUNCTION_TRACE("acpi_bus_get_power_flags");
181 * Power Management Flags
183 status = acpi_get_handle(device->handle, "_PSC", &handle);
184 if (ACPI_SUCCESS(status))
185 device->power.flags.explicit_get = 1;
186 status = acpi_get_handle(device->handle, "_IRC", &handle);
187 if (ACPI_SUCCESS(status))
188 device->power.flags.inrush_current = 1;
191 * Enumerate supported power management states
193 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
194 struct acpi_device_power_state *ps = &device->power.states[i];
195 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
197 /* Evaluate "_PRx" to se if power resources are referenced */
198 acpi_evaluate_reference(device->handle, object_name, NULL,
200 if (ps->resources.count) {
201 device->power.flags.power_resources = 1;
205 /* Evaluate "_PSx" to see if we can do explicit sets */
206 object_name[2] = 'S';
207 status = acpi_get_handle(device->handle, object_name, &handle);
208 if (ACPI_SUCCESS(status)) {
209 ps->flags.explicit_set = 1;
213 /* State is valid if we have some power control */
214 if (ps->resources.count || ps->flags.explicit_set)
217 ps->power = -1; /* Unknown - driver assigned */
218 ps->latency = -1; /* Unknown - driver assigned */
221 /* Set defaults for D0 and D3 states (always valid) */
222 device->power.states[ACPI_STATE_D0].flags.valid = 1;
223 device->power.states[ACPI_STATE_D0].power = 100;
224 device->power.states[ACPI_STATE_D3].flags.valid = 1;
225 device->power.states[ACPI_STATE_D3].power = 0;
227 /* TBD: System wake support and resource requirements. */
229 device->power.state = ACPI_STATE_UNKNOWN;
234 int acpi_match_ids(struct acpi_device *device, char *ids)
237 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
239 if (device->flags.hardware_id)
240 if (strstr(ids, device->pnp.hardware_id))
243 if (device->flags.compatible_ids) {
244 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
247 /* compare multiple _CID entries against driver ids */
248 for (i = 0; i < cid_list->count; i++) {
249 if (strstr(ids, cid_list->id[i].value))
257 acpi_os_free(buffer.pointer);
262 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
263 union acpi_object *package)
266 union acpi_object *element = NULL;
268 if (!device || !package || (package->package.count < 2))
269 return AE_BAD_PARAMETER;
271 element = &(package->package.elements[0]);
273 return AE_BAD_PARAMETER;
274 if (element->type == ACPI_TYPE_PACKAGE) {
275 if ((element->package.count < 2) ||
276 (element->package.elements[0].type !=
277 ACPI_TYPE_LOCAL_REFERENCE)
278 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
280 device->wakeup.gpe_device =
281 element->package.elements[0].reference.handle;
282 device->wakeup.gpe_number =
283 (u32) element->package.elements[1].integer.value;
284 } else if (element->type == ACPI_TYPE_INTEGER) {
285 device->wakeup.gpe_number = element->integer.value;
289 element = &(package->package.elements[1]);
290 if (element->type != ACPI_TYPE_INTEGER) {
293 device->wakeup.sleep_state = element->integer.value;
295 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
298 device->wakeup.resources.count = package->package.count - 2;
299 for (i = 0; i < device->wakeup.resources.count; i++) {
300 element = &(package->package.elements[i + 2]);
301 if (element->type != ACPI_TYPE_ANY) {
305 device->wakeup.resources.handles[i] = element->reference.handle;
311 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
313 acpi_status status = 0;
314 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
315 union acpi_object *package = NULL;
317 ACPI_FUNCTION_TRACE("acpi_bus_get_wakeup_flags");
320 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
321 if (ACPI_FAILURE(status)) {
322 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRW\n"));
326 package = (union acpi_object *)buffer.pointer;
327 status = acpi_bus_extract_wakeup_device_power_package(device, package);
328 if (ACPI_FAILURE(status)) {
329 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
330 "Error extracting _PRW package\n"));
334 acpi_os_free(buffer.pointer);
336 device->wakeup.flags.valid = 1;
337 /* Power button, Lid switch always enable wakeup */
338 if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E"))
339 device->wakeup.flags.run_wake = 1;
342 if (ACPI_FAILURE(status))
343 device->flags.wake_capable = 0;
347 /* --------------------------------------------------------------------------
348 ACPI sysfs device file support
349 -------------------------------------------------------------------------- */
350 static ssize_t acpi_eject_store(struct acpi_device *device,
351 const char *buf, size_t count);
353 #define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \
354 static struct acpi_device_attribute acpi_device_attr_##_name = \
355 __ATTR(_name, _mode, _show, _store)
357 ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
360 * setup_sys_fs_device_files - sets up the device files under device namespace
361 * @dev: acpi_device object
362 * @func: function pointer to create or destroy the device file
365 setup_sys_fs_device_files(struct acpi_device *dev,
366 acpi_device_sysfs_files * func)
369 acpi_handle temp = NULL;
372 * If device has _EJ0, 'eject' file is created that is used to trigger
373 * hot-removal function from userland.
375 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
376 if (ACPI_SUCCESS(status))
377 (*(func)) (&dev->kobj, &acpi_device_attr_eject.attr);
380 static int acpi_eject_operation(acpi_handle handle, int lockable)
382 struct acpi_object_list arg_list;
383 union acpi_object arg;
384 acpi_status status = AE_OK;
387 * TBD: evaluate _PS3?
392 arg_list.pointer = &arg;
393 arg.type = ACPI_TYPE_INTEGER;
394 arg.integer.value = 0;
395 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
399 arg_list.pointer = &arg;
400 arg.type = ACPI_TYPE_INTEGER;
401 arg.integer.value = 1;
407 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
408 if (ACPI_FAILURE(status)) {
416 acpi_eject_store(struct acpi_device *device, const char *buf, size_t count)
423 acpi_object_type type = 0;
425 if ((!count) || (buf[0] != '1')) {
429 if (device->driver == NULL) {
434 status = acpi_get_type(device->handle, &type);
435 if (ACPI_FAILURE(status) || (!device->flags.ejectable)) {
440 islockable = device->flags.lockable;
441 handle = device->handle;
443 if (type == ACPI_TYPE_PROCESSOR)
444 result = acpi_bus_trim(device, 0);
446 result = acpi_bus_trim(device, 1);
449 result = acpi_eject_operation(handle, islockable);
458 /* --------------------------------------------------------------------------
459 Performance Management
460 -------------------------------------------------------------------------- */
462 static int acpi_bus_get_perf_flags(struct acpi_device *device)
464 device->performance.state = ACPI_STATE_UNKNOWN;
468 /* --------------------------------------------------------------------------
470 -------------------------------------------------------------------------- */
472 static LIST_HEAD(acpi_bus_drivers);
473 static DECLARE_MUTEX(acpi_bus_drivers_lock);
476 * acpi_bus_match - match device IDs to driver's supported IDs
477 * @device: the device that we are trying to match to a driver
478 * @driver: driver whose device id table is being checked
480 * Checks the device's hardware (_HID) or compatible (_CID) ids to see if it
481 * matches the specified driver's criteria.
484 acpi_bus_match(struct acpi_device *device, struct acpi_driver *driver)
486 if (driver && driver->ops.match)
487 return driver->ops.match(device, driver);
488 return acpi_match_ids(device, driver->ids);
492 * acpi_bus_driver_init - add a device to a driver
493 * @device: the device to add and initialize
494 * @driver: driver for the device
496 * Used to initialize a device via its device driver. Called whenever a
497 * driver is bound to a device. Invokes the driver's add() and start() ops.
500 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
504 ACPI_FUNCTION_TRACE("acpi_bus_driver_init");
506 if (!device || !driver)
507 return_VALUE(-EINVAL);
509 if (!driver->ops.add)
510 return_VALUE(-ENOSYS);
512 result = driver->ops.add(device);
514 device->driver = NULL;
515 acpi_driver_data(device) = NULL;
516 return_VALUE(result);
519 device->driver = driver;
522 * TBD - Configuration Management: Assign resources to device based
523 * upon possible configuration and currently allocated resources.
526 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
527 "Driver successfully bound to device\n"));
531 static int acpi_start_single_object(struct acpi_device *device)
534 struct acpi_driver *driver;
536 ACPI_FUNCTION_TRACE("acpi_start_single_object");
538 if (!(driver = device->driver))
541 if (driver->ops.start) {
542 result = driver->ops.start(device);
543 if (result && driver->ops.remove)
544 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
547 return_VALUE(result);
550 static void acpi_driver_attach(struct acpi_driver *drv)
552 struct list_head *node, *next;
554 ACPI_FUNCTION_TRACE("acpi_driver_attach");
556 spin_lock(&acpi_device_lock);
557 list_for_each_safe(node, next, &acpi_device_list) {
558 struct acpi_device *dev =
559 container_of(node, struct acpi_device, g_list);
561 if (dev->driver || !dev->status.present)
563 spin_unlock(&acpi_device_lock);
565 if (!acpi_bus_match(dev, drv)) {
566 if (!acpi_bus_driver_init(dev, drv)) {
567 acpi_start_single_object(dev);
568 atomic_inc(&drv->references);
569 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
570 "Found driver [%s] for device [%s]\n",
571 drv->name, dev->pnp.bus_id));
574 spin_lock(&acpi_device_lock);
576 spin_unlock(&acpi_device_lock);
579 static void acpi_driver_detach(struct acpi_driver *drv)
581 struct list_head *node, *next;
583 ACPI_FUNCTION_TRACE("acpi_driver_detach");
585 spin_lock(&acpi_device_lock);
586 list_for_each_safe(node, next, &acpi_device_list) {
587 struct acpi_device *dev =
588 container_of(node, struct acpi_device, g_list);
590 if (dev->driver == drv) {
591 spin_unlock(&acpi_device_lock);
593 drv->ops.remove(dev, ACPI_BUS_REMOVAL_NORMAL);
594 spin_lock(&acpi_device_lock);
596 dev->driver_data = NULL;
597 atomic_dec(&drv->references);
600 spin_unlock(&acpi_device_lock);
604 * acpi_bus_register_driver - register a driver with the ACPI bus
605 * @driver: driver being registered
607 * Registers a driver with the ACPI bus. Searches the namespace for all
608 * devices that match the driver's criteria and binds. Returns zero for
609 * success or a negative error status for failure.
611 int acpi_bus_register_driver(struct acpi_driver *driver)
613 ACPI_FUNCTION_TRACE("acpi_bus_register_driver");
616 return_VALUE(-ENODEV);
618 spin_lock(&acpi_device_lock);
619 list_add_tail(&driver->node, &acpi_bus_drivers);
620 spin_unlock(&acpi_device_lock);
621 acpi_driver_attach(driver);
626 EXPORT_SYMBOL(acpi_bus_register_driver);
629 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
630 * @driver: driver to unregister
632 * Unregisters a driver with the ACPI bus. Searches the namespace for all
633 * devices that match the driver's criteria and unbinds.
635 void acpi_bus_unregister_driver(struct acpi_driver *driver)
637 acpi_driver_detach(driver);
639 if (!atomic_read(&driver->references)) {
640 spin_lock(&acpi_device_lock);
641 list_del_init(&driver->node);
642 spin_unlock(&acpi_device_lock);
647 EXPORT_SYMBOL(acpi_bus_unregister_driver);
650 * acpi_bus_find_driver - check if there is a driver installed for the device
651 * @device: device that we are trying to find a supporting driver for
653 * Parses the list of registered drivers looking for a driver applicable for
654 * the specified device.
656 static int acpi_bus_find_driver(struct acpi_device *device)
659 struct list_head *node, *next;
661 ACPI_FUNCTION_TRACE("acpi_bus_find_driver");
663 spin_lock(&acpi_device_lock);
664 list_for_each_safe(node, next, &acpi_bus_drivers) {
665 struct acpi_driver *driver =
666 container_of(node, struct acpi_driver, node);
668 atomic_inc(&driver->references);
669 spin_unlock(&acpi_device_lock);
670 if (!acpi_bus_match(device, driver)) {
671 result = acpi_bus_driver_init(device, driver);
675 atomic_dec(&driver->references);
676 spin_lock(&acpi_device_lock);
678 spin_unlock(&acpi_device_lock);
681 return_VALUE(result);
684 /* --------------------------------------------------------------------------
686 -------------------------------------------------------------------------- */
688 static int acpi_bus_get_flags(struct acpi_device *device)
690 acpi_status status = AE_OK;
691 acpi_handle temp = NULL;
693 ACPI_FUNCTION_TRACE("acpi_bus_get_flags");
695 /* Presence of _STA indicates 'dynamic_status' */
696 status = acpi_get_handle(device->handle, "_STA", &temp);
697 if (ACPI_SUCCESS(status))
698 device->flags.dynamic_status = 1;
700 /* Presence of _CID indicates 'compatible_ids' */
701 status = acpi_get_handle(device->handle, "_CID", &temp);
702 if (ACPI_SUCCESS(status))
703 device->flags.compatible_ids = 1;
705 /* Presence of _RMV indicates 'removable' */
706 status = acpi_get_handle(device->handle, "_RMV", &temp);
707 if (ACPI_SUCCESS(status))
708 device->flags.removable = 1;
710 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
711 status = acpi_get_handle(device->handle, "_EJD", &temp);
712 if (ACPI_SUCCESS(status))
713 device->flags.ejectable = 1;
715 status = acpi_get_handle(device->handle, "_EJ0", &temp);
716 if (ACPI_SUCCESS(status))
717 device->flags.ejectable = 1;
720 /* Presence of _LCK indicates 'lockable' */
721 status = acpi_get_handle(device->handle, "_LCK", &temp);
722 if (ACPI_SUCCESS(status))
723 device->flags.lockable = 1;
725 /* Presence of _PS0|_PR0 indicates 'power manageable' */
726 status = acpi_get_handle(device->handle, "_PS0", &temp);
727 if (ACPI_FAILURE(status))
728 status = acpi_get_handle(device->handle, "_PR0", &temp);
729 if (ACPI_SUCCESS(status))
730 device->flags.power_manageable = 1;
732 /* Presence of _PRW indicates wake capable */
733 status = acpi_get_handle(device->handle, "_PRW", &temp);
734 if (ACPI_SUCCESS(status))
735 device->flags.wake_capable = 1;
737 /* TBD: Peformance management */
742 static void acpi_device_get_busid(struct acpi_device *device,
743 acpi_handle handle, int type)
745 char bus_id[5] = { '?', 0 };
746 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
752 * The device's Bus ID is simply the object name.
753 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
756 case ACPI_BUS_TYPE_SYSTEM:
757 strcpy(device->pnp.bus_id, "ACPI");
759 case ACPI_BUS_TYPE_POWER_BUTTON:
760 strcpy(device->pnp.bus_id, "PWRF");
762 case ACPI_BUS_TYPE_SLEEP_BUTTON:
763 strcpy(device->pnp.bus_id, "SLPF");
766 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
767 /* Clean up trailing underscores (if any) */
768 for (i = 3; i > 1; i--) {
769 if (bus_id[i] == '_')
774 strcpy(device->pnp.bus_id, bus_id);
779 static void acpi_device_set_id(struct acpi_device *device,
780 struct acpi_device *parent, acpi_handle handle,
783 struct acpi_device_info *info;
784 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
787 struct acpi_compatible_id_list *cid_list = NULL;
791 case ACPI_BUS_TYPE_DEVICE:
792 status = acpi_get_object_info(handle, &buffer);
793 if (ACPI_FAILURE(status)) {
794 printk("%s: Error reading device info\n", __FUNCTION__);
798 info = buffer.pointer;
799 if (info->valid & ACPI_VALID_HID)
800 hid = info->hardware_id.value;
801 if (info->valid & ACPI_VALID_UID)
802 uid = info->unique_id.value;
803 if (info->valid & ACPI_VALID_CID)
804 cid_list = &info->compatibility_id;
805 if (info->valid & ACPI_VALID_ADR) {
806 device->pnp.bus_address = info->address;
807 device->flags.bus_address = 1;
810 case ACPI_BUS_TYPE_POWER:
811 hid = ACPI_POWER_HID;
813 case ACPI_BUS_TYPE_PROCESSOR:
814 hid = ACPI_PROCESSOR_HID;
816 case ACPI_BUS_TYPE_SYSTEM:
817 hid = ACPI_SYSTEM_HID;
819 case ACPI_BUS_TYPE_THERMAL:
820 hid = ACPI_THERMAL_HID;
822 case ACPI_BUS_TYPE_POWER_BUTTON:
823 hid = ACPI_BUTTON_HID_POWERF;
825 case ACPI_BUS_TYPE_SLEEP_BUTTON:
826 hid = ACPI_BUTTON_HID_SLEEPF;
833 * Fix for the system root bus device -- the only root-level device.
835 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
837 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
838 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
842 strcpy(device->pnp.hardware_id, hid);
843 device->flags.hardware_id = 1;
846 strcpy(device->pnp.unique_id, uid);
847 device->flags.unique_id = 1;
850 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
851 if (device->pnp.cid_list)
852 memcpy(device->pnp.cid_list, cid_list, cid_list->size);
854 printk(KERN_ERR "Memory allocation error\n");
857 acpi_os_free(buffer.pointer);
860 static int acpi_device_set_context(struct acpi_device *device, int type)
862 acpi_status status = AE_OK;
867 * Attach this 'struct acpi_device' to the ACPI object. This makes
868 * resolutions from handle->device very efficient. Note that we need
869 * to be careful with fixed-feature devices as they all attach to the
872 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
873 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
874 status = acpi_attach_data(device->handle,
875 acpi_bus_data_handler, device);
877 if (ACPI_FAILURE(status)) {
878 printk("Error attaching device data\n");
885 static void acpi_device_get_debug_info(struct acpi_device *device,
886 acpi_handle handle, int type)
888 #ifdef CONFIG_ACPI_DEBUG_OUTPUT
889 char *type_string = NULL;
890 char name[80] = { '?', '\0' };
891 struct acpi_buffer buffer = { sizeof(name), name };
894 case ACPI_BUS_TYPE_DEVICE:
895 type_string = "Device";
896 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
898 case ACPI_BUS_TYPE_POWER:
899 type_string = "Power Resource";
900 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
902 case ACPI_BUS_TYPE_PROCESSOR:
903 type_string = "Processor";
904 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
906 case ACPI_BUS_TYPE_SYSTEM:
907 type_string = "System";
908 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
910 case ACPI_BUS_TYPE_THERMAL:
911 type_string = "Thermal Zone";
912 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
914 case ACPI_BUS_TYPE_POWER_BUTTON:
915 type_string = "Power Button";
916 sprintf(name, "PWRB");
918 case ACPI_BUS_TYPE_SLEEP_BUTTON:
919 type_string = "Sleep Button";
920 sprintf(name, "SLPB");
924 printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle);
925 #endif /*CONFIG_ACPI_DEBUG_OUTPUT */
928 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
931 struct acpi_driver *driver;
933 ACPI_FUNCTION_TRACE("acpi_bus_remove");
936 return_VALUE(-EINVAL);
938 driver = dev->driver;
940 if ((driver) && (driver->ops.remove)) {
942 if (driver->ops.stop) {
943 result = driver->ops.stop(dev, ACPI_BUS_REMOVAL_EJECT);
945 return_VALUE(result);
948 result = dev->driver->ops.remove(dev, ACPI_BUS_REMOVAL_EJECT);
950 return_VALUE(result);
953 atomic_dec(&dev->driver->references);
955 acpi_driver_data(dev) = NULL;
961 if (dev->flags.bus_address) {
962 if ((dev->parent) && (dev->parent->ops.unbind))
963 dev->parent->ops.unbind(dev);
966 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
972 acpi_add_single_object(struct acpi_device **child,
973 struct acpi_device *parent, acpi_handle handle, int type)
976 struct acpi_device *device = NULL;
978 ACPI_FUNCTION_TRACE("acpi_add_single_object");
981 return_VALUE(-EINVAL);
983 device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
985 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n"));
986 return_VALUE(-ENOMEM);
988 memset(device, 0, sizeof(struct acpi_device));
990 device->handle = handle;
991 device->parent = parent;
993 acpi_device_get_busid(device, handle, type);
998 * Get prior to calling acpi_bus_get_status() so we know whether
999 * or not _STA is present. Note that we only look for object
1000 * handles -- cannot evaluate objects until we know the device is
1001 * present and properly initialized.
1003 result = acpi_bus_get_flags(device);
1010 * See if the device is present. We always assume that non-Device
1011 * and non-Processor objects (e.g. thermal zones, power resources,
1012 * etc.) are present, functioning, etc. (at least when parent object
1013 * is present). Note that _STA has a different meaning for some
1014 * objects (e.g. power resources) so we need to be careful how we use
1018 case ACPI_BUS_TYPE_PROCESSOR:
1019 case ACPI_BUS_TYPE_DEVICE:
1020 result = acpi_bus_get_status(device);
1021 if (ACPI_FAILURE(result) || !device->status.present) {
1027 STRUCT_TO_INT(device->status) = 0x0F;
1034 * TBD: Synch with Core's enumeration/initialization process.
1038 * Hardware ID, Unique ID, & Bus Address
1039 * -------------------------------------
1041 acpi_device_set_id(device, parent, handle, type);
1047 if (device->flags.power_manageable) {
1048 result = acpi_bus_get_power_flags(device);
1054 * Wakeup device management
1055 *-----------------------
1057 if (device->flags.wake_capable) {
1058 result = acpi_bus_get_wakeup_device_flags(device);
1064 * Performance Management
1065 * ----------------------
1067 if (device->flags.performance_manageable) {
1068 result = acpi_bus_get_perf_flags(device);
1073 if ((result = acpi_device_set_context(device, type)))
1076 acpi_device_get_debug_info(device, handle, type);
1078 acpi_device_register(device, parent);
1081 * Bind _ADR-Based Devices
1082 * -----------------------
1083 * If there's a a bus address (_ADR) then we utilize the parent's
1084 * 'bind' function (if exists) to bind the ACPI- and natively-
1085 * enumerated device representations.
1087 if (device->flags.bus_address) {
1088 if (device->parent && device->parent->ops.bind)
1089 device->parent->ops.bind(device);
1093 * Locate & Attach Driver
1094 * ----------------------
1095 * If there's a hardware id (_HID) or compatible ids (_CID) we check
1096 * to see if there's a driver installed for this kind of device. Note
1097 * that drivers can install before or after a device is enumerated.
1099 * TBD: Assumes LDM provides driver hot-plug capability.
1101 acpi_bus_find_driver(device);
1107 kfree(device->pnp.cid_list);
1111 return_VALUE(result);
1114 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1116 acpi_status status = AE_OK;
1117 struct acpi_device *parent = NULL;
1118 struct acpi_device *child = NULL;
1119 acpi_handle phandle = NULL;
1120 acpi_handle chandle = NULL;
1121 acpi_object_type type = 0;
1124 ACPI_FUNCTION_TRACE("acpi_bus_scan");
1127 return_VALUE(-EINVAL);
1130 phandle = start->handle;
1133 * Parse through the ACPI namespace, identify all 'devices', and
1134 * create a new 'struct acpi_device' for each.
1136 while ((level > 0) && parent) {
1138 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1142 * If this scope is exhausted then move our way back up.
1144 if (ACPI_FAILURE(status)) {
1147 acpi_get_parent(phandle, &phandle);
1149 parent = parent->parent;
1153 status = acpi_get_type(chandle, &type);
1154 if (ACPI_FAILURE(status))
1158 * If this is a scope object then parse it (depth-first).
1160 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1168 * We're only interested in objects that we consider 'devices'.
1171 case ACPI_TYPE_DEVICE:
1172 type = ACPI_BUS_TYPE_DEVICE;
1174 case ACPI_TYPE_PROCESSOR:
1175 type = ACPI_BUS_TYPE_PROCESSOR;
1177 case ACPI_TYPE_THERMAL:
1178 type = ACPI_BUS_TYPE_THERMAL;
1180 case ACPI_TYPE_POWER:
1181 type = ACPI_BUS_TYPE_POWER;
1187 if (ops->acpi_op_add)
1188 status = acpi_add_single_object(&child, parent,
1191 status = acpi_bus_get_device(chandle, &child);
1193 if (ACPI_FAILURE(status))
1196 if (ops->acpi_op_start) {
1197 status = acpi_start_single_object(child);
1198 if (ACPI_FAILURE(status))
1203 * If the device is present, enabled, and functioning then
1204 * parse its scope (depth-first). Note that we need to
1205 * represent absent devices to facilitate PnP notifications
1206 * -- but only the subtree head (not all of its children,
1207 * which will be enumerated when the parent is inserted).
1209 * TBD: Need notifications and other detection mechanisms
1210 * in place before we can fully implement this.
1212 if (child->status.present) {
1213 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1215 if (ACPI_SUCCESS(status)) {
1228 acpi_bus_add(struct acpi_device **child,
1229 struct acpi_device *parent, acpi_handle handle, int type)
1232 struct acpi_bus_ops ops;
1234 ACPI_FUNCTION_TRACE("acpi_bus_add");
1236 result = acpi_add_single_object(child, parent, handle, type);
1238 memset(&ops, 0, sizeof(ops));
1239 ops.acpi_op_add = 1;
1240 result = acpi_bus_scan(*child, &ops);
1242 return_VALUE(result);
1245 EXPORT_SYMBOL(acpi_bus_add);
1247 int acpi_bus_start(struct acpi_device *device)
1250 struct acpi_bus_ops ops;
1252 ACPI_FUNCTION_TRACE("acpi_bus_start");
1255 return_VALUE(-EINVAL);
1257 result = acpi_start_single_object(device);
1259 memset(&ops, 0, sizeof(ops));
1260 ops.acpi_op_start = 1;
1261 result = acpi_bus_scan(device, &ops);
1263 return_VALUE(result);
1266 EXPORT_SYMBOL(acpi_bus_start);
1268 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1271 struct acpi_device *parent, *child;
1272 acpi_handle phandle, chandle;
1273 acpi_object_type type;
1278 phandle = start->handle;
1279 child = chandle = NULL;
1281 while ((level > 0) && parent && (!err)) {
1282 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1286 * If this scope is exhausted then move our way back up.
1288 if (ACPI_FAILURE(status)) {
1291 acpi_get_parent(phandle, &phandle);
1293 parent = parent->parent;
1296 err = acpi_bus_remove(child, rmdevice);
1298 err = acpi_bus_remove(child, 1);
1303 status = acpi_get_type(chandle, &type);
1304 if (ACPI_FAILURE(status)) {
1308 * If there is a device corresponding to chandle then
1309 * parse it (depth-first).
1311 if (acpi_bus_get_device(chandle, &child) == 0) {
1321 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1324 static int acpi_bus_scan_fixed(struct acpi_device *root)
1327 struct acpi_device *device = NULL;
1329 ACPI_FUNCTION_TRACE("acpi_bus_scan_fixed");
1332 return_VALUE(-ENODEV);
1335 * Enumerate all fixed-feature devices.
1337 if (acpi_fadt.pwr_button == 0) {
1338 result = acpi_add_single_object(&device, acpi_root,
1340 ACPI_BUS_TYPE_POWER_BUTTON);
1342 result = acpi_start_single_object(device);
1345 if (acpi_fadt.sleep_button == 0) {
1346 result = acpi_add_single_object(&device, acpi_root,
1348 ACPI_BUS_TYPE_SLEEP_BUTTON);
1350 result = acpi_start_single_object(device);
1353 return_VALUE(result);
1356 static int __init acpi_scan_init(void)
1359 struct acpi_bus_ops ops;
1361 ACPI_FUNCTION_TRACE("acpi_scan_init");
1366 kset_register(&acpi_namespace_kset);
1369 * Create the root device in the bus's device tree
1371 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1372 ACPI_BUS_TYPE_SYSTEM);
1376 result = acpi_start_single_object(acpi_root);
1379 * Enumerate devices in the ACPI namespace.
1381 result = acpi_bus_scan_fixed(acpi_root);
1383 memset(&ops, 0, sizeof(ops));
1384 ops.acpi_op_add = 1;
1385 ops.acpi_op_start = 1;
1386 result = acpi_bus_scan(acpi_root, &ops);
1390 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1393 return_VALUE(result);
1396 subsys_initcall(acpi_scan_init);