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)
236 if (device->flags.hardware_id)
237 if (strstr(ids, device->pnp.hardware_id))
240 if (device->flags.compatible_ids) {
241 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
244 /* compare multiple _CID entries against driver ids */
245 for (i = 0; i < cid_list->count; i++) {
246 if (strstr(ids, cid_list->id[i].value))
254 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
255 union acpi_object *package)
258 union acpi_object *element = NULL;
260 if (!device || !package || (package->package.count < 2))
261 return AE_BAD_PARAMETER;
263 element = &(package->package.elements[0]);
265 return AE_BAD_PARAMETER;
266 if (element->type == ACPI_TYPE_PACKAGE) {
267 if ((element->package.count < 2) ||
268 (element->package.elements[0].type !=
269 ACPI_TYPE_LOCAL_REFERENCE)
270 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
272 device->wakeup.gpe_device =
273 element->package.elements[0].reference.handle;
274 device->wakeup.gpe_number =
275 (u32) element->package.elements[1].integer.value;
276 } else if (element->type == ACPI_TYPE_INTEGER) {
277 device->wakeup.gpe_number = element->integer.value;
281 element = &(package->package.elements[1]);
282 if (element->type != ACPI_TYPE_INTEGER) {
285 device->wakeup.sleep_state = element->integer.value;
287 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
290 device->wakeup.resources.count = package->package.count - 2;
291 for (i = 0; i < device->wakeup.resources.count; i++) {
292 element = &(package->package.elements[i + 2]);
293 if (element->type != ACPI_TYPE_ANY) {
297 device->wakeup.resources.handles[i] = element->reference.handle;
303 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
305 acpi_status status = 0;
306 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
307 union acpi_object *package = NULL;
309 ACPI_FUNCTION_TRACE("acpi_bus_get_wakeup_flags");
312 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
313 if (ACPI_FAILURE(status)) {
314 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRW\n"));
318 package = (union acpi_object *)buffer.pointer;
319 status = acpi_bus_extract_wakeup_device_power_package(device, package);
320 if (ACPI_FAILURE(status)) {
321 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
322 "Error extracting _PRW package\n"));
326 acpi_os_free(buffer.pointer);
328 device->wakeup.flags.valid = 1;
329 /* Power button, Lid switch always enable wakeup */
330 if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E"))
331 device->wakeup.flags.run_wake = 1;
334 if (ACPI_FAILURE(status))
335 device->flags.wake_capable = 0;
339 /* --------------------------------------------------------------------------
340 ACPI sysfs device file support
341 -------------------------------------------------------------------------- */
342 static ssize_t acpi_eject_store(struct acpi_device *device,
343 const char *buf, size_t count);
345 #define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \
346 static struct acpi_device_attribute acpi_device_attr_##_name = \
347 __ATTR(_name, _mode, _show, _store)
349 ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
352 * setup_sys_fs_device_files - sets up the device files under device namespace
353 * @dev: acpi_device object
354 * @func: function pointer to create or destroy the device file
357 setup_sys_fs_device_files(struct acpi_device *dev,
358 acpi_device_sysfs_files * func)
361 acpi_handle temp = NULL;
364 * If device has _EJ0, 'eject' file is created that is used to trigger
365 * hot-removal function from userland.
367 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
368 if (ACPI_SUCCESS(status))
369 (*(func)) (&dev->kobj, &acpi_device_attr_eject.attr);
372 static int acpi_eject_operation(acpi_handle handle, int lockable)
374 struct acpi_object_list arg_list;
375 union acpi_object arg;
376 acpi_status status = AE_OK;
379 * TBD: evaluate _PS3?
384 arg_list.pointer = &arg;
385 arg.type = ACPI_TYPE_INTEGER;
386 arg.integer.value = 0;
387 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
391 arg_list.pointer = &arg;
392 arg.type = ACPI_TYPE_INTEGER;
393 arg.integer.value = 1;
399 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
400 if (ACPI_FAILURE(status)) {
408 acpi_eject_store(struct acpi_device *device, const char *buf, size_t count)
415 acpi_object_type type = 0;
417 if ((!count) || (buf[0] != '1')) {
421 if (device->driver == NULL) {
426 status = acpi_get_type(device->handle, &type);
427 if (ACPI_FAILURE(status) || (!device->flags.ejectable)) {
432 islockable = device->flags.lockable;
433 handle = device->handle;
435 result = acpi_bus_trim(device, 1);
438 result = acpi_eject_operation(handle, islockable);
447 /* --------------------------------------------------------------------------
448 Performance Management
449 -------------------------------------------------------------------------- */
451 static int acpi_bus_get_perf_flags(struct acpi_device *device)
453 device->performance.state = ACPI_STATE_UNKNOWN;
457 /* --------------------------------------------------------------------------
459 -------------------------------------------------------------------------- */
461 static LIST_HEAD(acpi_bus_drivers);
462 static DECLARE_MUTEX(acpi_bus_drivers_lock);
465 * acpi_bus_match - match device IDs to driver's supported IDs
466 * @device: the device that we are trying to match to a driver
467 * @driver: driver whose device id table is being checked
469 * Checks the device's hardware (_HID) or compatible (_CID) ids to see if it
470 * matches the specified driver's criteria.
473 acpi_bus_match(struct acpi_device *device, struct acpi_driver *driver)
475 if (driver && driver->ops.match)
476 return driver->ops.match(device, driver);
477 return acpi_match_ids(device, driver->ids);
481 * acpi_bus_driver_init - add a device to a driver
482 * @device: the device to add and initialize
483 * @driver: driver for the device
485 * Used to initialize a device via its device driver. Called whenever a
486 * driver is bound to a device. Invokes the driver's add() and start() ops.
489 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
493 ACPI_FUNCTION_TRACE("acpi_bus_driver_init");
495 if (!device || !driver)
496 return_VALUE(-EINVAL);
498 if (!driver->ops.add)
499 return_VALUE(-ENOSYS);
501 result = driver->ops.add(device);
503 device->driver = NULL;
504 acpi_driver_data(device) = NULL;
505 return_VALUE(result);
508 device->driver = driver;
511 * TBD - Configuration Management: Assign resources to device based
512 * upon possible configuration and currently allocated resources.
515 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
516 "Driver successfully bound to device\n"));
520 static int acpi_start_single_object(struct acpi_device *device)
523 struct acpi_driver *driver;
525 ACPI_FUNCTION_TRACE("acpi_start_single_object");
527 if (!(driver = device->driver))
530 if (driver->ops.start) {
531 result = driver->ops.start(device);
532 if (result && driver->ops.remove)
533 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
536 return_VALUE(result);
539 static void acpi_driver_attach(struct acpi_driver *drv)
541 struct list_head *node, *next;
543 ACPI_FUNCTION_TRACE("acpi_driver_attach");
545 spin_lock(&acpi_device_lock);
546 list_for_each_safe(node, next, &acpi_device_list) {
547 struct acpi_device *dev =
548 container_of(node, struct acpi_device, g_list);
550 if (dev->driver || !dev->status.present)
552 spin_unlock(&acpi_device_lock);
554 if (!acpi_bus_match(dev, drv)) {
555 if (!acpi_bus_driver_init(dev, drv)) {
556 acpi_start_single_object(dev);
557 atomic_inc(&drv->references);
558 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
559 "Found driver [%s] for device [%s]\n",
560 drv->name, dev->pnp.bus_id));
563 spin_lock(&acpi_device_lock);
565 spin_unlock(&acpi_device_lock);
568 static void acpi_driver_detach(struct acpi_driver *drv)
570 struct list_head *node, *next;
572 ACPI_FUNCTION_TRACE("acpi_driver_detach");
574 spin_lock(&acpi_device_lock);
575 list_for_each_safe(node, next, &acpi_device_list) {
576 struct acpi_device *dev =
577 container_of(node, struct acpi_device, g_list);
579 if (dev->driver == drv) {
580 spin_unlock(&acpi_device_lock);
582 drv->ops.remove(dev, ACPI_BUS_REMOVAL_NORMAL);
583 spin_lock(&acpi_device_lock);
585 dev->driver_data = NULL;
586 atomic_dec(&drv->references);
589 spin_unlock(&acpi_device_lock);
593 * acpi_bus_register_driver - register a driver with the ACPI bus
594 * @driver: driver being registered
596 * Registers a driver with the ACPI bus. Searches the namespace for all
597 * devices that match the driver's criteria and binds. Returns zero for
598 * success or a negative error status for failure.
600 int acpi_bus_register_driver(struct acpi_driver *driver)
602 ACPI_FUNCTION_TRACE("acpi_bus_register_driver");
605 return_VALUE(-ENODEV);
607 spin_lock(&acpi_device_lock);
608 list_add_tail(&driver->node, &acpi_bus_drivers);
609 spin_unlock(&acpi_device_lock);
610 acpi_driver_attach(driver);
615 EXPORT_SYMBOL(acpi_bus_register_driver);
618 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
619 * @driver: driver to unregister
621 * Unregisters a driver with the ACPI bus. Searches the namespace for all
622 * devices that match the driver's criteria and unbinds.
624 void acpi_bus_unregister_driver(struct acpi_driver *driver)
626 acpi_driver_detach(driver);
628 if (!atomic_read(&driver->references)) {
629 spin_lock(&acpi_device_lock);
630 list_del_init(&driver->node);
631 spin_unlock(&acpi_device_lock);
636 EXPORT_SYMBOL(acpi_bus_unregister_driver);
639 * acpi_bus_find_driver - check if there is a driver installed for the device
640 * @device: device that we are trying to find a supporting driver for
642 * Parses the list of registered drivers looking for a driver applicable for
643 * the specified device.
645 static int acpi_bus_find_driver(struct acpi_device *device)
648 struct list_head *node, *next;
650 ACPI_FUNCTION_TRACE("acpi_bus_find_driver");
652 spin_lock(&acpi_device_lock);
653 list_for_each_safe(node, next, &acpi_bus_drivers) {
654 struct acpi_driver *driver =
655 container_of(node, struct acpi_driver, node);
657 atomic_inc(&driver->references);
658 spin_unlock(&acpi_device_lock);
659 if (!acpi_bus_match(device, driver)) {
660 result = acpi_bus_driver_init(device, driver);
664 atomic_dec(&driver->references);
665 spin_lock(&acpi_device_lock);
667 spin_unlock(&acpi_device_lock);
670 return_VALUE(result);
673 /* --------------------------------------------------------------------------
675 -------------------------------------------------------------------------- */
677 static int acpi_bus_get_flags(struct acpi_device *device)
679 acpi_status status = AE_OK;
680 acpi_handle temp = NULL;
682 ACPI_FUNCTION_TRACE("acpi_bus_get_flags");
684 /* Presence of _STA indicates 'dynamic_status' */
685 status = acpi_get_handle(device->handle, "_STA", &temp);
686 if (ACPI_SUCCESS(status))
687 device->flags.dynamic_status = 1;
689 /* Presence of _CID indicates 'compatible_ids' */
690 status = acpi_get_handle(device->handle, "_CID", &temp);
691 if (ACPI_SUCCESS(status))
692 device->flags.compatible_ids = 1;
694 /* Presence of _RMV indicates 'removable' */
695 status = acpi_get_handle(device->handle, "_RMV", &temp);
696 if (ACPI_SUCCESS(status))
697 device->flags.removable = 1;
699 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
700 status = acpi_get_handle(device->handle, "_EJD", &temp);
701 if (ACPI_SUCCESS(status))
702 device->flags.ejectable = 1;
704 status = acpi_get_handle(device->handle, "_EJ0", &temp);
705 if (ACPI_SUCCESS(status))
706 device->flags.ejectable = 1;
709 /* Presence of _LCK indicates 'lockable' */
710 status = acpi_get_handle(device->handle, "_LCK", &temp);
711 if (ACPI_SUCCESS(status))
712 device->flags.lockable = 1;
714 /* Presence of _PS0|_PR0 indicates 'power manageable' */
715 status = acpi_get_handle(device->handle, "_PS0", &temp);
716 if (ACPI_FAILURE(status))
717 status = acpi_get_handle(device->handle, "_PR0", &temp);
718 if (ACPI_SUCCESS(status))
719 device->flags.power_manageable = 1;
721 /* Presence of _PRW indicates wake capable */
722 status = acpi_get_handle(device->handle, "_PRW", &temp);
723 if (ACPI_SUCCESS(status))
724 device->flags.wake_capable = 1;
726 /* TBD: Peformance management */
731 static void acpi_device_get_busid(struct acpi_device *device,
732 acpi_handle handle, int type)
734 char bus_id[5] = { '?', 0 };
735 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
741 * The device's Bus ID is simply the object name.
742 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
745 case ACPI_BUS_TYPE_SYSTEM:
746 strcpy(device->pnp.bus_id, "ACPI");
748 case ACPI_BUS_TYPE_POWER_BUTTON:
749 strcpy(device->pnp.bus_id, "PWRF");
751 case ACPI_BUS_TYPE_SLEEP_BUTTON:
752 strcpy(device->pnp.bus_id, "SLPF");
755 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
756 /* Clean up trailing underscores (if any) */
757 for (i = 3; i > 1; i--) {
758 if (bus_id[i] == '_')
763 strcpy(device->pnp.bus_id, bus_id);
768 static void acpi_device_set_id(struct acpi_device *device,
769 struct acpi_device *parent, acpi_handle handle,
772 struct acpi_device_info *info;
773 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
776 struct acpi_compatible_id_list *cid_list = NULL;
780 case ACPI_BUS_TYPE_DEVICE:
781 status = acpi_get_object_info(handle, &buffer);
782 if (ACPI_FAILURE(status)) {
783 printk("%s: Error reading device info\n", __FUNCTION__);
787 info = buffer.pointer;
788 if (info->valid & ACPI_VALID_HID)
789 hid = info->hardware_id.value;
790 if (info->valid & ACPI_VALID_UID)
791 uid = info->unique_id.value;
792 if (info->valid & ACPI_VALID_CID)
793 cid_list = &info->compatibility_id;
794 if (info->valid & ACPI_VALID_ADR) {
795 device->pnp.bus_address = info->address;
796 device->flags.bus_address = 1;
799 case ACPI_BUS_TYPE_POWER:
800 hid = ACPI_POWER_HID;
802 case ACPI_BUS_TYPE_PROCESSOR:
803 hid = ACPI_PROCESSOR_HID;
805 case ACPI_BUS_TYPE_SYSTEM:
806 hid = ACPI_SYSTEM_HID;
808 case ACPI_BUS_TYPE_THERMAL:
809 hid = ACPI_THERMAL_HID;
811 case ACPI_BUS_TYPE_POWER_BUTTON:
812 hid = ACPI_BUTTON_HID_POWERF;
814 case ACPI_BUS_TYPE_SLEEP_BUTTON:
815 hid = ACPI_BUTTON_HID_SLEEPF;
822 * Fix for the system root bus device -- the only root-level device.
824 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
826 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
827 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
831 strcpy(device->pnp.hardware_id, hid);
832 device->flags.hardware_id = 1;
835 strcpy(device->pnp.unique_id, uid);
836 device->flags.unique_id = 1;
839 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
840 if (device->pnp.cid_list)
841 memcpy(device->pnp.cid_list, cid_list, cid_list->size);
843 printk(KERN_ERR "Memory allocation error\n");
846 acpi_os_free(buffer.pointer);
849 static int acpi_device_set_context(struct acpi_device *device, int type)
851 acpi_status status = AE_OK;
856 * Attach this 'struct acpi_device' to the ACPI object. This makes
857 * resolutions from handle->device very efficient. Note that we need
858 * to be careful with fixed-feature devices as they all attach to the
861 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
862 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
863 status = acpi_attach_data(device->handle,
864 acpi_bus_data_handler, device);
866 if (ACPI_FAILURE(status)) {
867 printk("Error attaching device data\n");
874 static void acpi_device_get_debug_info(struct acpi_device *device,
875 acpi_handle handle, int type)
877 #ifdef CONFIG_ACPI_DEBUG_OUTPUT
878 char *type_string = NULL;
879 char name[80] = { '?', '\0' };
880 struct acpi_buffer buffer = { sizeof(name), name };
883 case ACPI_BUS_TYPE_DEVICE:
884 type_string = "Device";
885 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
887 case ACPI_BUS_TYPE_POWER:
888 type_string = "Power Resource";
889 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
891 case ACPI_BUS_TYPE_PROCESSOR:
892 type_string = "Processor";
893 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
895 case ACPI_BUS_TYPE_SYSTEM:
896 type_string = "System";
897 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
899 case ACPI_BUS_TYPE_THERMAL:
900 type_string = "Thermal Zone";
901 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
903 case ACPI_BUS_TYPE_POWER_BUTTON:
904 type_string = "Power Button";
905 sprintf(name, "PWRB");
907 case ACPI_BUS_TYPE_SLEEP_BUTTON:
908 type_string = "Sleep Button";
909 sprintf(name, "SLPB");
913 printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle);
914 #endif /*CONFIG_ACPI_DEBUG_OUTPUT */
917 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
920 struct acpi_driver *driver;
922 ACPI_FUNCTION_TRACE("acpi_bus_remove");
925 return_VALUE(-EINVAL);
927 driver = dev->driver;
929 if ((driver) && (driver->ops.remove)) {
931 if (driver->ops.stop) {
932 result = driver->ops.stop(dev, ACPI_BUS_REMOVAL_EJECT);
934 return_VALUE(result);
937 result = dev->driver->ops.remove(dev, ACPI_BUS_REMOVAL_EJECT);
939 return_VALUE(result);
942 atomic_dec(&dev->driver->references);
944 acpi_driver_data(dev) = NULL;
950 if (dev->flags.bus_address) {
951 if ((dev->parent) && (dev->parent->ops.unbind))
952 dev->parent->ops.unbind(dev);
955 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
961 acpi_add_single_object(struct acpi_device **child,
962 struct acpi_device *parent, acpi_handle handle, int type)
965 struct acpi_device *device = NULL;
967 ACPI_FUNCTION_TRACE("acpi_add_single_object");
970 return_VALUE(-EINVAL);
972 device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
974 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n"));
975 return_VALUE(-ENOMEM);
977 memset(device, 0, sizeof(struct acpi_device));
979 device->handle = handle;
980 device->parent = parent;
982 acpi_device_get_busid(device, handle, type);
987 * Get prior to calling acpi_bus_get_status() so we know whether
988 * or not _STA is present. Note that we only look for object
989 * handles -- cannot evaluate objects until we know the device is
990 * present and properly initialized.
992 result = acpi_bus_get_flags(device);
999 * See if the device is present. We always assume that non-Device
1000 * and non-Processor objects (e.g. thermal zones, power resources,
1001 * etc.) are present, functioning, etc. (at least when parent object
1002 * is present). Note that _STA has a different meaning for some
1003 * objects (e.g. power resources) so we need to be careful how we use
1007 case ACPI_BUS_TYPE_PROCESSOR:
1008 case ACPI_BUS_TYPE_DEVICE:
1009 result = acpi_bus_get_status(device);
1010 if (ACPI_FAILURE(result) || !device->status.present) {
1016 STRUCT_TO_INT(device->status) = 0x0F;
1023 * TBD: Synch with Core's enumeration/initialization process.
1027 * Hardware ID, Unique ID, & Bus Address
1028 * -------------------------------------
1030 acpi_device_set_id(device, parent, handle, type);
1036 if (device->flags.power_manageable) {
1037 result = acpi_bus_get_power_flags(device);
1043 * Wakeup device management
1044 *-----------------------
1046 if (device->flags.wake_capable) {
1047 result = acpi_bus_get_wakeup_device_flags(device);
1053 * Performance Management
1054 * ----------------------
1056 if (device->flags.performance_manageable) {
1057 result = acpi_bus_get_perf_flags(device);
1062 if ((result = acpi_device_set_context(device, type)))
1065 acpi_device_get_debug_info(device, handle, type);
1067 acpi_device_register(device, parent);
1070 * Bind _ADR-Based Devices
1071 * -----------------------
1072 * If there's a a bus address (_ADR) then we utilize the parent's
1073 * 'bind' function (if exists) to bind the ACPI- and natively-
1074 * enumerated device representations.
1076 if (device->flags.bus_address) {
1077 if (device->parent && device->parent->ops.bind)
1078 device->parent->ops.bind(device);
1082 * Locate & Attach Driver
1083 * ----------------------
1084 * If there's a hardware id (_HID) or compatible ids (_CID) we check
1085 * to see if there's a driver installed for this kind of device. Note
1086 * that drivers can install before or after a device is enumerated.
1088 * TBD: Assumes LDM provides driver hot-plug capability.
1090 acpi_bus_find_driver(device);
1096 kfree(device->pnp.cid_list);
1100 return_VALUE(result);
1103 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1105 acpi_status status = AE_OK;
1106 struct acpi_device *parent = NULL;
1107 struct acpi_device *child = NULL;
1108 acpi_handle phandle = NULL;
1109 acpi_handle chandle = NULL;
1110 acpi_object_type type = 0;
1113 ACPI_FUNCTION_TRACE("acpi_bus_scan");
1116 return_VALUE(-EINVAL);
1119 phandle = start->handle;
1122 * Parse through the ACPI namespace, identify all 'devices', and
1123 * create a new 'struct acpi_device' for each.
1125 while ((level > 0) && parent) {
1127 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1131 * If this scope is exhausted then move our way back up.
1133 if (ACPI_FAILURE(status)) {
1136 acpi_get_parent(phandle, &phandle);
1138 parent = parent->parent;
1142 status = acpi_get_type(chandle, &type);
1143 if (ACPI_FAILURE(status))
1147 * If this is a scope object then parse it (depth-first).
1149 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1157 * We're only interested in objects that we consider 'devices'.
1160 case ACPI_TYPE_DEVICE:
1161 type = ACPI_BUS_TYPE_DEVICE;
1163 case ACPI_TYPE_PROCESSOR:
1164 type = ACPI_BUS_TYPE_PROCESSOR;
1166 case ACPI_TYPE_THERMAL:
1167 type = ACPI_BUS_TYPE_THERMAL;
1169 case ACPI_TYPE_POWER:
1170 type = ACPI_BUS_TYPE_POWER;
1176 if (ops->acpi_op_add)
1177 status = acpi_add_single_object(&child, parent,
1180 status = acpi_bus_get_device(chandle, &child);
1182 if (ACPI_FAILURE(status))
1185 if (ops->acpi_op_start) {
1186 status = acpi_start_single_object(child);
1187 if (ACPI_FAILURE(status))
1192 * If the device is present, enabled, and functioning then
1193 * parse its scope (depth-first). Note that we need to
1194 * represent absent devices to facilitate PnP notifications
1195 * -- but only the subtree head (not all of its children,
1196 * which will be enumerated when the parent is inserted).
1198 * TBD: Need notifications and other detection mechanisms
1199 * in place before we can fully implement this.
1201 if (child->status.present) {
1202 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1204 if (ACPI_SUCCESS(status)) {
1217 acpi_bus_add(struct acpi_device **child,
1218 struct acpi_device *parent, acpi_handle handle, int type)
1221 struct acpi_bus_ops ops;
1223 ACPI_FUNCTION_TRACE("acpi_bus_add");
1225 result = acpi_add_single_object(child, parent, handle, type);
1227 memset(&ops, 0, sizeof(ops));
1228 ops.acpi_op_add = 1;
1229 result = acpi_bus_scan(*child, &ops);
1231 return_VALUE(result);
1234 EXPORT_SYMBOL(acpi_bus_add);
1236 int acpi_bus_start(struct acpi_device *device)
1239 struct acpi_bus_ops ops;
1241 ACPI_FUNCTION_TRACE("acpi_bus_start");
1244 return_VALUE(-EINVAL);
1246 result = acpi_start_single_object(device);
1248 memset(&ops, 0, sizeof(ops));
1249 ops.acpi_op_start = 1;
1250 result = acpi_bus_scan(device, &ops);
1252 return_VALUE(result);
1255 EXPORT_SYMBOL(acpi_bus_start);
1257 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1260 struct acpi_device *parent, *child;
1261 acpi_handle phandle, chandle;
1262 acpi_object_type type;
1267 phandle = start->handle;
1268 child = chandle = NULL;
1270 while ((level > 0) && parent && (!err)) {
1271 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1275 * If this scope is exhausted then move our way back up.
1277 if (ACPI_FAILURE(status)) {
1280 acpi_get_parent(phandle, &phandle);
1282 parent = parent->parent;
1285 err = acpi_bus_remove(child, rmdevice);
1287 err = acpi_bus_remove(child, 1);
1292 status = acpi_get_type(chandle, &type);
1293 if (ACPI_FAILURE(status)) {
1297 * If there is a device corresponding to chandle then
1298 * parse it (depth-first).
1300 if (acpi_bus_get_device(chandle, &child) == 0) {
1310 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1313 static int acpi_bus_scan_fixed(struct acpi_device *root)
1316 struct acpi_device *device = NULL;
1318 ACPI_FUNCTION_TRACE("acpi_bus_scan_fixed");
1321 return_VALUE(-ENODEV);
1324 * Enumerate all fixed-feature devices.
1326 if (acpi_fadt.pwr_button == 0) {
1327 result = acpi_add_single_object(&device, acpi_root,
1329 ACPI_BUS_TYPE_POWER_BUTTON);
1331 result = acpi_start_single_object(device);
1334 if (acpi_fadt.sleep_button == 0) {
1335 result = acpi_add_single_object(&device, acpi_root,
1337 ACPI_BUS_TYPE_SLEEP_BUTTON);
1339 result = acpi_start_single_object(device);
1342 return_VALUE(result);
1345 static int __init acpi_scan_init(void)
1348 struct acpi_bus_ops ops;
1350 ACPI_FUNCTION_TRACE("acpi_scan_init");
1355 kset_register(&acpi_namespace_kset);
1358 * Create the root device in the bus's device tree
1360 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1361 ACPI_BUS_TYPE_SYSTEM);
1365 result = acpi_start_single_object(acpi_root);
1368 * Enumerate devices in the ACPI namespace.
1370 result = acpi_bus_scan_fixed(acpi_root);
1372 memset(&ops, 0, sizeof(ops));
1373 ops.acpi_op_add = 1;
1374 ops.acpi_op_start = 1;
1375 result = acpi_bus_scan(acpi_root, &ops);
1379 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1382 return_VALUE(result);
1385 subsys_initcall(acpi_scan_init);