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 int 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);
164 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
166 ACPI_FUNCTION_TRACE("acpi_bus_data_handler");
173 static int acpi_bus_get_power_flags(struct acpi_device *device)
175 acpi_status status = 0;
176 acpi_handle handle = NULL;
179 ACPI_FUNCTION_TRACE("acpi_bus_get_power_flags");
182 * Power Management Flags
184 status = acpi_get_handle(device->handle, "_PSC", &handle);
185 if (ACPI_SUCCESS(status))
186 device->power.flags.explicit_get = 1;
187 status = acpi_get_handle(device->handle, "_IRC", &handle);
188 if (ACPI_SUCCESS(status))
189 device->power.flags.inrush_current = 1;
192 * Enumerate supported power management states
194 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
195 struct acpi_device_power_state *ps = &device->power.states[i];
196 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
198 /* Evaluate "_PRx" to se if power resources are referenced */
199 acpi_evaluate_reference(device->handle, object_name, NULL,
201 if (ps->resources.count) {
202 device->power.flags.power_resources = 1;
206 /* Evaluate "_PSx" to see if we can do explicit sets */
207 object_name[2] = 'S';
208 status = acpi_get_handle(device->handle, object_name, &handle);
209 if (ACPI_SUCCESS(status)) {
210 ps->flags.explicit_set = 1;
214 /* State is valid if we have some power control */
215 if (ps->resources.count || ps->flags.explicit_set)
218 ps->power = -1; /* Unknown - driver assigned */
219 ps->latency = -1; /* Unknown - driver assigned */
222 /* Set defaults for D0 and D3 states (always valid) */
223 device->power.states[ACPI_STATE_D0].flags.valid = 1;
224 device->power.states[ACPI_STATE_D0].power = 100;
225 device->power.states[ACPI_STATE_D3].flags.valid = 1;
226 device->power.states[ACPI_STATE_D3].power = 0;
228 /* TBD: System wake support and resource requirements. */
230 device->power.state = ACPI_STATE_UNKNOWN;
235 int acpi_match_ids(struct acpi_device *device, char *ids)
238 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
240 if (device->flags.hardware_id)
241 if (strstr(ids, device->pnp.hardware_id))
244 if (device->flags.compatible_ids) {
245 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
248 /* compare multiple _CID entries against driver ids */
249 for (i = 0; i < cid_list->count; i++) {
250 if (strstr(ids, cid_list->id[i].value))
258 acpi_os_free(buffer.pointer);
263 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
264 union acpi_object *package)
267 union acpi_object *element = NULL;
269 if (!device || !package || (package->package.count < 2))
270 return AE_BAD_PARAMETER;
272 element = &(package->package.elements[0]);
274 return AE_BAD_PARAMETER;
275 if (element->type == ACPI_TYPE_PACKAGE) {
276 if ((element->package.count < 2) ||
277 (element->package.elements[0].type !=
278 ACPI_TYPE_LOCAL_REFERENCE)
279 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
281 device->wakeup.gpe_device =
282 element->package.elements[0].reference.handle;
283 device->wakeup.gpe_number =
284 (u32) element->package.elements[1].integer.value;
285 } else if (element->type == ACPI_TYPE_INTEGER) {
286 device->wakeup.gpe_number = element->integer.value;
290 element = &(package->package.elements[1]);
291 if (element->type != ACPI_TYPE_INTEGER) {
294 device->wakeup.sleep_state = element->integer.value;
296 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
299 device->wakeup.resources.count = package->package.count - 2;
300 for (i = 0; i < device->wakeup.resources.count; i++) {
301 element = &(package->package.elements[i + 2]);
302 if (element->type != ACPI_TYPE_ANY) {
306 device->wakeup.resources.handles[i] = element->reference.handle;
312 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
314 acpi_status status = 0;
315 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
316 union acpi_object *package = NULL;
318 ACPI_FUNCTION_TRACE("acpi_bus_get_wakeup_flags");
321 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
322 if (ACPI_FAILURE(status)) {
323 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRW\n"));
327 package = (union acpi_object *)buffer.pointer;
328 status = acpi_bus_extract_wakeup_device_power_package(device, package);
329 if (ACPI_FAILURE(status)) {
330 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
331 "Error extracting _PRW package\n"));
335 acpi_os_free(buffer.pointer);
337 device->wakeup.flags.valid = 1;
338 /* Power button, Lid switch always enable wakeup */
339 if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E"))
340 device->wakeup.flags.run_wake = 1;
343 if (ACPI_FAILURE(status))
344 device->flags.wake_capable = 0;
348 /* --------------------------------------------------------------------------
349 ACPI sysfs device file support
350 -------------------------------------------------------------------------- */
351 static ssize_t acpi_eject_store(struct acpi_device *device,
352 const char *buf, size_t count);
354 #define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \
355 static struct acpi_device_attribute acpi_device_attr_##_name = \
356 __ATTR(_name, _mode, _show, _store)
358 ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
361 * setup_sys_fs_device_files - sets up the device files under device namespace
362 * @dev: acpi_device object
363 * @func: function pointer to create or destroy the device file
366 setup_sys_fs_device_files(struct acpi_device *dev,
367 acpi_device_sysfs_files * func)
370 acpi_handle temp = NULL;
373 * If device has _EJ0, 'eject' file is created that is used to trigger
374 * hot-removal function from userland.
376 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
377 if (ACPI_SUCCESS(status))
378 (*(func)) (&dev->kobj, &acpi_device_attr_eject.attr);
381 static int acpi_eject_operation(acpi_handle handle, int lockable)
383 struct acpi_object_list arg_list;
384 union acpi_object arg;
385 acpi_status status = AE_OK;
388 * TBD: evaluate _PS3?
393 arg_list.pointer = &arg;
394 arg.type = ACPI_TYPE_INTEGER;
395 arg.integer.value = 0;
396 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
400 arg_list.pointer = &arg;
401 arg.type = ACPI_TYPE_INTEGER;
402 arg.integer.value = 1;
408 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
409 if (ACPI_FAILURE(status)) {
417 acpi_eject_store(struct acpi_device *device, const char *buf, size_t count)
424 acpi_object_type type = 0;
426 if ((!count) || (buf[0] != '1')) {
430 if (device->driver == NULL) {
435 status = acpi_get_type(device->handle, &type);
436 if (ACPI_FAILURE(status) || (!device->flags.ejectable)) {
441 islockable = device->flags.lockable;
442 handle = device->handle;
444 result = acpi_bus_trim(device, 1);
447 result = acpi_eject_operation(handle, islockable);
456 /* --------------------------------------------------------------------------
457 Performance Management
458 -------------------------------------------------------------------------- */
460 static int acpi_bus_get_perf_flags(struct acpi_device *device)
462 device->performance.state = ACPI_STATE_UNKNOWN;
466 /* --------------------------------------------------------------------------
468 -------------------------------------------------------------------------- */
470 static LIST_HEAD(acpi_bus_drivers);
471 static DECLARE_MUTEX(acpi_bus_drivers_lock);
474 * acpi_bus_match - match device IDs to driver's supported IDs
475 * @device: the device that we are trying to match to a driver
476 * @driver: driver whose device id table is being checked
478 * Checks the device's hardware (_HID) or compatible (_CID) ids to see if it
479 * matches the specified driver's criteria.
482 acpi_bus_match(struct acpi_device *device, struct acpi_driver *driver)
484 if (driver && driver->ops.match)
485 return driver->ops.match(device, driver);
486 return acpi_match_ids(device, driver->ids);
490 * acpi_bus_driver_init - add a device to a driver
491 * @device: the device to add and initialize
492 * @driver: driver for the device
494 * Used to initialize a device via its device driver. Called whenever a
495 * driver is bound to a device. Invokes the driver's add() and start() ops.
498 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
502 ACPI_FUNCTION_TRACE("acpi_bus_driver_init");
504 if (!device || !driver)
505 return_VALUE(-EINVAL);
507 if (!driver->ops.add)
508 return_VALUE(-ENOSYS);
510 result = driver->ops.add(device);
512 device->driver = NULL;
513 acpi_driver_data(device) = NULL;
514 return_VALUE(result);
517 device->driver = driver;
520 * TBD - Configuration Management: Assign resources to device based
521 * upon possible configuration and currently allocated resources.
524 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
525 "Driver successfully bound to device\n"));
529 static int acpi_start_single_object(struct acpi_device *device)
532 struct acpi_driver *driver;
534 ACPI_FUNCTION_TRACE("acpi_start_single_object");
536 if (!(driver = device->driver))
539 if (driver->ops.start) {
540 result = driver->ops.start(device);
541 if (result && driver->ops.remove)
542 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
545 return_VALUE(result);
548 static int acpi_driver_attach(struct acpi_driver *drv)
550 struct list_head *node, *next;
553 ACPI_FUNCTION_TRACE("acpi_driver_attach");
555 spin_lock(&acpi_device_lock);
556 list_for_each_safe(node, next, &acpi_device_list) {
557 struct acpi_device *dev =
558 container_of(node, struct acpi_device, g_list);
560 if (dev->driver || !dev->status.present)
562 spin_unlock(&acpi_device_lock);
564 if (!acpi_bus_match(dev, drv)) {
565 if (!acpi_bus_driver_init(dev, drv)) {
566 acpi_start_single_object(dev);
567 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);
580 static int acpi_driver_detach(struct acpi_driver *drv)
582 struct list_head *node, *next;
584 ACPI_FUNCTION_TRACE("acpi_driver_detach");
586 spin_lock(&acpi_device_lock);
587 list_for_each_safe(node, next, &acpi_device_list) {
588 struct acpi_device *dev =
589 container_of(node, struct acpi_device, g_list);
591 if (dev->driver == drv) {
592 spin_unlock(&acpi_device_lock);
594 drv->ops.remove(dev, ACPI_BUS_REMOVAL_NORMAL);
595 spin_lock(&acpi_device_lock);
597 dev->driver_data = NULL;
598 atomic_dec(&drv->references);
601 spin_unlock(&acpi_device_lock);
606 * acpi_bus_register_driver - register a driver with the ACPI bus
607 * @driver: driver being registered
609 * Registers a driver with the ACPI bus. Searches the namespace for all
610 * devices that match the driver's criteria and binds. Returns the
611 * number of devices that were claimed by the driver, or a negative
612 * error status for failure.
614 int acpi_bus_register_driver(struct acpi_driver *driver)
618 ACPI_FUNCTION_TRACE("acpi_bus_register_driver");
621 return_VALUE(-ENODEV);
624 return_VALUE(-EINVAL);
626 spin_lock(&acpi_device_lock);
627 list_add_tail(&driver->node, &acpi_bus_drivers);
628 spin_unlock(&acpi_device_lock);
629 count = acpi_driver_attach(driver);
634 EXPORT_SYMBOL(acpi_bus_register_driver);
637 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
638 * @driver: driver to unregister
640 * Unregisters a driver with the ACPI bus. Searches the namespace for all
641 * devices that match the driver's criteria and unbinds.
643 int acpi_bus_unregister_driver(struct acpi_driver *driver)
647 ACPI_FUNCTION_TRACE("acpi_bus_unregister_driver");
650 acpi_driver_detach(driver);
652 if (!atomic_read(&driver->references)) {
653 spin_lock(&acpi_device_lock);
654 list_del_init(&driver->node);
655 spin_unlock(&acpi_device_lock);
662 EXPORT_SYMBOL(acpi_bus_unregister_driver);
665 * acpi_bus_find_driver - check if there is a driver installed for the device
666 * @device: device that we are trying to find a supporting driver for
668 * Parses the list of registered drivers looking for a driver applicable for
669 * the specified device.
671 static int acpi_bus_find_driver(struct acpi_device *device)
674 struct list_head *node, *next;
676 ACPI_FUNCTION_TRACE("acpi_bus_find_driver");
678 spin_lock(&acpi_device_lock);
679 list_for_each_safe(node, next, &acpi_bus_drivers) {
680 struct acpi_driver *driver =
681 container_of(node, struct acpi_driver, node);
683 atomic_inc(&driver->references);
684 spin_unlock(&acpi_device_lock);
685 if (!acpi_bus_match(device, driver)) {
686 result = acpi_bus_driver_init(device, driver);
690 atomic_dec(&driver->references);
691 spin_lock(&acpi_device_lock);
693 spin_unlock(&acpi_device_lock);
696 return_VALUE(result);
699 /* --------------------------------------------------------------------------
701 -------------------------------------------------------------------------- */
703 static int acpi_bus_get_flags(struct acpi_device *device)
705 acpi_status status = AE_OK;
706 acpi_handle temp = NULL;
708 ACPI_FUNCTION_TRACE("acpi_bus_get_flags");
710 /* Presence of _STA indicates 'dynamic_status' */
711 status = acpi_get_handle(device->handle, "_STA", &temp);
712 if (ACPI_SUCCESS(status))
713 device->flags.dynamic_status = 1;
715 /* Presence of _CID indicates 'compatible_ids' */
716 status = acpi_get_handle(device->handle, "_CID", &temp);
717 if (ACPI_SUCCESS(status))
718 device->flags.compatible_ids = 1;
720 /* Presence of _RMV indicates 'removable' */
721 status = acpi_get_handle(device->handle, "_RMV", &temp);
722 if (ACPI_SUCCESS(status))
723 device->flags.removable = 1;
725 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
726 status = acpi_get_handle(device->handle, "_EJD", &temp);
727 if (ACPI_SUCCESS(status))
728 device->flags.ejectable = 1;
730 status = acpi_get_handle(device->handle, "_EJ0", &temp);
731 if (ACPI_SUCCESS(status))
732 device->flags.ejectable = 1;
735 /* Presence of _LCK indicates 'lockable' */
736 status = acpi_get_handle(device->handle, "_LCK", &temp);
737 if (ACPI_SUCCESS(status))
738 device->flags.lockable = 1;
740 /* Presence of _PS0|_PR0 indicates 'power manageable' */
741 status = acpi_get_handle(device->handle, "_PS0", &temp);
742 if (ACPI_FAILURE(status))
743 status = acpi_get_handle(device->handle, "_PR0", &temp);
744 if (ACPI_SUCCESS(status))
745 device->flags.power_manageable = 1;
747 /* Presence of _PRW indicates wake capable */
748 status = acpi_get_handle(device->handle, "_PRW", &temp);
749 if (ACPI_SUCCESS(status))
750 device->flags.wake_capable = 1;
752 /* TBD: Peformance management */
757 static void acpi_device_get_busid(struct acpi_device *device,
758 acpi_handle handle, int type)
760 char bus_id[5] = { '?', 0 };
761 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
767 * The device's Bus ID is simply the object name.
768 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
771 case ACPI_BUS_TYPE_SYSTEM:
772 strcpy(device->pnp.bus_id, "ACPI");
774 case ACPI_BUS_TYPE_POWER_BUTTON:
775 strcpy(device->pnp.bus_id, "PWRF");
777 case ACPI_BUS_TYPE_SLEEP_BUTTON:
778 strcpy(device->pnp.bus_id, "SLPF");
781 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
782 /* Clean up trailing underscores (if any) */
783 for (i = 3; i > 1; i--) {
784 if (bus_id[i] == '_')
789 strcpy(device->pnp.bus_id, bus_id);
794 static void acpi_device_set_id(struct acpi_device *device,
795 struct acpi_device *parent, acpi_handle handle,
798 struct acpi_device_info *info;
799 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
802 struct acpi_compatible_id_list *cid_list = NULL;
806 case ACPI_BUS_TYPE_DEVICE:
807 status = acpi_get_object_info(handle, &buffer);
808 if (ACPI_FAILURE(status)) {
809 printk("%s: Error reading device info\n", __FUNCTION__);
813 info = buffer.pointer;
814 if (info->valid & ACPI_VALID_HID)
815 hid = info->hardware_id.value;
816 if (info->valid & ACPI_VALID_UID)
817 uid = info->unique_id.value;
818 if (info->valid & ACPI_VALID_CID)
819 cid_list = &info->compatibility_id;
820 if (info->valid & ACPI_VALID_ADR) {
821 device->pnp.bus_address = info->address;
822 device->flags.bus_address = 1;
825 case ACPI_BUS_TYPE_POWER:
826 hid = ACPI_POWER_HID;
828 case ACPI_BUS_TYPE_PROCESSOR:
829 hid = ACPI_PROCESSOR_HID;
831 case ACPI_BUS_TYPE_SYSTEM:
832 hid = ACPI_SYSTEM_HID;
834 case ACPI_BUS_TYPE_THERMAL:
835 hid = ACPI_THERMAL_HID;
837 case ACPI_BUS_TYPE_POWER_BUTTON:
838 hid = ACPI_BUTTON_HID_POWERF;
840 case ACPI_BUS_TYPE_SLEEP_BUTTON:
841 hid = ACPI_BUTTON_HID_SLEEPF;
848 * Fix for the system root bus device -- the only root-level device.
850 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
852 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
853 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
857 strcpy(device->pnp.hardware_id, hid);
858 device->flags.hardware_id = 1;
861 strcpy(device->pnp.unique_id, uid);
862 device->flags.unique_id = 1;
865 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
866 if (device->pnp.cid_list)
867 memcpy(device->pnp.cid_list, cid_list, cid_list->size);
869 printk(KERN_ERR "Memory allocation error\n");
872 acpi_os_free(buffer.pointer);
875 static int acpi_device_set_context(struct acpi_device *device, int type)
877 acpi_status status = AE_OK;
882 * Attach this 'struct acpi_device' to the ACPI object. This makes
883 * resolutions from handle->device very efficient. Note that we need
884 * to be careful with fixed-feature devices as they all attach to the
887 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
888 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
889 status = acpi_attach_data(device->handle,
890 acpi_bus_data_handler, device);
892 if (ACPI_FAILURE(status)) {
893 printk("Error attaching device data\n");
900 static void acpi_device_get_debug_info(struct acpi_device *device,
901 acpi_handle handle, int type)
903 #ifdef CONFIG_ACPI_DEBUG_OUTPUT
904 char *type_string = NULL;
905 char name[80] = { '?', '\0' };
906 struct acpi_buffer buffer = { sizeof(name), name };
909 case ACPI_BUS_TYPE_DEVICE:
910 type_string = "Device";
911 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
913 case ACPI_BUS_TYPE_POWER:
914 type_string = "Power Resource";
915 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
917 case ACPI_BUS_TYPE_PROCESSOR:
918 type_string = "Processor";
919 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
921 case ACPI_BUS_TYPE_SYSTEM:
922 type_string = "System";
923 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
925 case ACPI_BUS_TYPE_THERMAL:
926 type_string = "Thermal Zone";
927 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
929 case ACPI_BUS_TYPE_POWER_BUTTON:
930 type_string = "Power Button";
931 sprintf(name, "PWRB");
933 case ACPI_BUS_TYPE_SLEEP_BUTTON:
934 type_string = "Sleep Button";
935 sprintf(name, "SLPB");
939 printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle);
940 #endif /*CONFIG_ACPI_DEBUG_OUTPUT */
943 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
946 struct acpi_driver *driver;
948 ACPI_FUNCTION_TRACE("acpi_bus_remove");
951 return_VALUE(-EINVAL);
953 driver = dev->driver;
955 if ((driver) && (driver->ops.remove)) {
957 if (driver->ops.stop) {
958 result = driver->ops.stop(dev, ACPI_BUS_REMOVAL_EJECT);
960 return_VALUE(result);
963 result = dev->driver->ops.remove(dev, ACPI_BUS_REMOVAL_EJECT);
965 return_VALUE(result);
968 atomic_dec(&dev->driver->references);
970 acpi_driver_data(dev) = NULL;
976 if (dev->flags.bus_address) {
977 if ((dev->parent) && (dev->parent->ops.unbind))
978 dev->parent->ops.unbind(dev);
981 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
987 acpi_add_single_object(struct acpi_device **child,
988 struct acpi_device *parent, acpi_handle handle, int type)
991 struct acpi_device *device = NULL;
993 ACPI_FUNCTION_TRACE("acpi_add_single_object");
996 return_VALUE(-EINVAL);
998 device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
1000 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n"));
1001 return_VALUE(-ENOMEM);
1003 memset(device, 0, sizeof(struct acpi_device));
1005 device->handle = handle;
1006 device->parent = parent;
1008 acpi_device_get_busid(device, handle, type);
1013 * Get prior to calling acpi_bus_get_status() so we know whether
1014 * or not _STA is present. Note that we only look for object
1015 * handles -- cannot evaluate objects until we know the device is
1016 * present and properly initialized.
1018 result = acpi_bus_get_flags(device);
1025 * See if the device is present. We always assume that non-Device
1026 * and non-Processor objects (e.g. thermal zones, power resources,
1027 * etc.) are present, functioning, etc. (at least when parent object
1028 * is present). Note that _STA has a different meaning for some
1029 * objects (e.g. power resources) so we need to be careful how we use
1033 case ACPI_BUS_TYPE_PROCESSOR:
1034 case ACPI_BUS_TYPE_DEVICE:
1035 result = acpi_bus_get_status(device);
1036 if (ACPI_FAILURE(result) || !device->status.present) {
1042 STRUCT_TO_INT(device->status) = 0x0F;
1049 * TBD: Synch with Core's enumeration/initialization process.
1053 * Hardware ID, Unique ID, & Bus Address
1054 * -------------------------------------
1056 acpi_device_set_id(device, parent, handle, type);
1062 if (device->flags.power_manageable) {
1063 result = acpi_bus_get_power_flags(device);
1069 * Wakeup device management
1070 *-----------------------
1072 if (device->flags.wake_capable) {
1073 result = acpi_bus_get_wakeup_device_flags(device);
1079 * Performance Management
1080 * ----------------------
1082 if (device->flags.performance_manageable) {
1083 result = acpi_bus_get_perf_flags(device);
1088 if ((result = acpi_device_set_context(device, type)))
1091 acpi_device_get_debug_info(device, handle, type);
1093 acpi_device_register(device, parent);
1096 * Bind _ADR-Based Devices
1097 * -----------------------
1098 * If there's a a bus address (_ADR) then we utilize the parent's
1099 * 'bind' function (if exists) to bind the ACPI- and natively-
1100 * enumerated device representations.
1102 if (device->flags.bus_address) {
1103 if (device->parent && device->parent->ops.bind)
1104 device->parent->ops.bind(device);
1108 * Locate & Attach Driver
1109 * ----------------------
1110 * If there's a hardware id (_HID) or compatible ids (_CID) we check
1111 * to see if there's a driver installed for this kind of device. Note
1112 * that drivers can install before or after a device is enumerated.
1114 * TBD: Assumes LDM provides driver hot-plug capability.
1116 acpi_bus_find_driver(device);
1122 kfree(device->pnp.cid_list);
1126 return_VALUE(result);
1129 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1131 acpi_status status = AE_OK;
1132 struct acpi_device *parent = NULL;
1133 struct acpi_device *child = NULL;
1134 acpi_handle phandle = NULL;
1135 acpi_handle chandle = NULL;
1136 acpi_object_type type = 0;
1139 ACPI_FUNCTION_TRACE("acpi_bus_scan");
1142 return_VALUE(-EINVAL);
1145 phandle = start->handle;
1148 * Parse through the ACPI namespace, identify all 'devices', and
1149 * create a new 'struct acpi_device' for each.
1151 while ((level > 0) && parent) {
1153 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1157 * If this scope is exhausted then move our way back up.
1159 if (ACPI_FAILURE(status)) {
1162 acpi_get_parent(phandle, &phandle);
1164 parent = parent->parent;
1168 status = acpi_get_type(chandle, &type);
1169 if (ACPI_FAILURE(status))
1173 * If this is a scope object then parse it (depth-first).
1175 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1183 * We're only interested in objects that we consider 'devices'.
1186 case ACPI_TYPE_DEVICE:
1187 type = ACPI_BUS_TYPE_DEVICE;
1189 case ACPI_TYPE_PROCESSOR:
1190 type = ACPI_BUS_TYPE_PROCESSOR;
1192 case ACPI_TYPE_THERMAL:
1193 type = ACPI_BUS_TYPE_THERMAL;
1195 case ACPI_TYPE_POWER:
1196 type = ACPI_BUS_TYPE_POWER;
1202 if (ops->acpi_op_add)
1203 status = acpi_add_single_object(&child, parent,
1206 status = acpi_bus_get_device(chandle, &child);
1208 if (ACPI_FAILURE(status))
1211 if (ops->acpi_op_start) {
1212 status = acpi_start_single_object(child);
1213 if (ACPI_FAILURE(status))
1218 * If the device is present, enabled, and functioning then
1219 * parse its scope (depth-first). Note that we need to
1220 * represent absent devices to facilitate PnP notifications
1221 * -- but only the subtree head (not all of its children,
1222 * which will be enumerated when the parent is inserted).
1224 * TBD: Need notifications and other detection mechanisms
1225 * in place before we can fully implement this.
1227 if (child->status.present) {
1228 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1230 if (ACPI_SUCCESS(status)) {
1243 acpi_bus_add(struct acpi_device **child,
1244 struct acpi_device *parent, acpi_handle handle, int type)
1247 struct acpi_bus_ops ops;
1249 ACPI_FUNCTION_TRACE("acpi_bus_add");
1251 result = acpi_add_single_object(child, parent, handle, type);
1253 memset(&ops, 0, sizeof(ops));
1254 ops.acpi_op_add = 1;
1255 result = acpi_bus_scan(*child, &ops);
1257 return_VALUE(result);
1260 EXPORT_SYMBOL(acpi_bus_add);
1262 int acpi_bus_start(struct acpi_device *device)
1265 struct acpi_bus_ops ops;
1267 ACPI_FUNCTION_TRACE("acpi_bus_start");
1270 return_VALUE(-EINVAL);
1272 result = acpi_start_single_object(device);
1274 memset(&ops, 0, sizeof(ops));
1275 ops.acpi_op_start = 1;
1276 result = acpi_bus_scan(device, &ops);
1278 return_VALUE(result);
1281 EXPORT_SYMBOL(acpi_bus_start);
1283 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1286 struct acpi_device *parent, *child;
1287 acpi_handle phandle, chandle;
1288 acpi_object_type type;
1293 phandle = start->handle;
1294 child = chandle = NULL;
1296 while ((level > 0) && parent && (!err)) {
1297 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1301 * If this scope is exhausted then move our way back up.
1303 if (ACPI_FAILURE(status)) {
1306 acpi_get_parent(phandle, &phandle);
1308 parent = parent->parent;
1311 err = acpi_bus_remove(child, rmdevice);
1313 err = acpi_bus_remove(child, 1);
1318 status = acpi_get_type(chandle, &type);
1319 if (ACPI_FAILURE(status)) {
1323 * If there is a device corresponding to chandle then
1324 * parse it (depth-first).
1326 if (acpi_bus_get_device(chandle, &child) == 0) {
1336 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1339 static int acpi_bus_scan_fixed(struct acpi_device *root)
1342 struct acpi_device *device = NULL;
1344 ACPI_FUNCTION_TRACE("acpi_bus_scan_fixed");
1347 return_VALUE(-ENODEV);
1350 * Enumerate all fixed-feature devices.
1352 if (acpi_fadt.pwr_button == 0) {
1353 result = acpi_add_single_object(&device, acpi_root,
1355 ACPI_BUS_TYPE_POWER_BUTTON);
1357 result = acpi_start_single_object(device);
1360 if (acpi_fadt.sleep_button == 0) {
1361 result = acpi_add_single_object(&device, acpi_root,
1363 ACPI_BUS_TYPE_SLEEP_BUTTON);
1365 result = acpi_start_single_object(device);
1368 return_VALUE(result);
1371 static int __init acpi_scan_init(void)
1374 struct acpi_bus_ops ops;
1376 ACPI_FUNCTION_TRACE("acpi_scan_init");
1381 kset_register(&acpi_namespace_kset);
1384 * Create the root device in the bus's device tree
1386 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1387 ACPI_BUS_TYPE_SYSTEM);
1391 result = acpi_start_single_object(acpi_root);
1394 * Enumerate devices in the ACPI namespace.
1396 result = acpi_bus_scan_fixed(acpi_root);
1398 memset(&ops, 0, sizeof(ops));
1399 ops.acpi_op_add = 1;
1400 ops.acpi_op_start = 1;
1401 result = acpi_bus_scan(acpi_root, &ops);
1405 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1408 return_VALUE(result);
1411 subsys_initcall(acpi_scan_init);