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)
237 if (device->flags.hardware_id)
238 if (strstr(ids, device->pnp.hardware_id))
241 if (device->flags.compatible_ids) {
242 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
245 /* compare multiple _CID entries against driver ids */
246 for (i = 0; i < cid_list->count; i++) {
247 if (strstr(ids, cid_list->id[i].value))
255 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
256 union acpi_object *package)
259 union acpi_object *element = NULL;
261 if (!device || !package || (package->package.count < 2))
262 return AE_BAD_PARAMETER;
264 element = &(package->package.elements[0]);
266 return AE_BAD_PARAMETER;
267 if (element->type == ACPI_TYPE_PACKAGE) {
268 if ((element->package.count < 2) ||
269 (element->package.elements[0].type !=
270 ACPI_TYPE_LOCAL_REFERENCE)
271 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
273 device->wakeup.gpe_device =
274 element->package.elements[0].reference.handle;
275 device->wakeup.gpe_number =
276 (u32) element->package.elements[1].integer.value;
277 } else if (element->type == ACPI_TYPE_INTEGER) {
278 device->wakeup.gpe_number = element->integer.value;
282 element = &(package->package.elements[1]);
283 if (element->type != ACPI_TYPE_INTEGER) {
286 device->wakeup.sleep_state = element->integer.value;
288 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
291 device->wakeup.resources.count = package->package.count - 2;
292 for (i = 0; i < device->wakeup.resources.count; i++) {
293 element = &(package->package.elements[i + 2]);
294 if (element->type != ACPI_TYPE_ANY) {
298 device->wakeup.resources.handles[i] = element->reference.handle;
304 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
306 acpi_status status = 0;
307 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
308 union acpi_object *package = NULL;
310 ACPI_FUNCTION_TRACE("acpi_bus_get_wakeup_flags");
313 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
314 if (ACPI_FAILURE(status)) {
315 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRW\n"));
319 package = (union acpi_object *)buffer.pointer;
320 status = acpi_bus_extract_wakeup_device_power_package(device, package);
321 if (ACPI_FAILURE(status)) {
322 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
323 "Error extracting _PRW package\n"));
327 acpi_os_free(buffer.pointer);
329 device->wakeup.flags.valid = 1;
330 /* Power button, Lid switch always enable wakeup */
331 if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E"))
332 device->wakeup.flags.run_wake = 1;
335 if (ACPI_FAILURE(status))
336 device->flags.wake_capable = 0;
340 /* --------------------------------------------------------------------------
341 ACPI sysfs device file support
342 -------------------------------------------------------------------------- */
343 static ssize_t acpi_eject_store(struct acpi_device *device,
344 const char *buf, size_t count);
346 #define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \
347 static struct acpi_device_attribute acpi_device_attr_##_name = \
348 __ATTR(_name, _mode, _show, _store)
350 ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
353 * setup_sys_fs_device_files - sets up the device files under device namespace
354 * @dev: acpi_device object
355 * @func: function pointer to create or destroy the device file
358 setup_sys_fs_device_files(struct acpi_device *dev,
359 acpi_device_sysfs_files * func)
362 acpi_handle temp = NULL;
365 * If device has _EJ0, 'eject' file is created that is used to trigger
366 * hot-removal function from userland.
368 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
369 if (ACPI_SUCCESS(status))
370 (*(func)) (&dev->kobj, &acpi_device_attr_eject.attr);
373 static int acpi_eject_operation(acpi_handle handle, int lockable)
375 struct acpi_object_list arg_list;
376 union acpi_object arg;
377 acpi_status status = AE_OK;
380 * TBD: evaluate _PS3?
385 arg_list.pointer = &arg;
386 arg.type = ACPI_TYPE_INTEGER;
387 arg.integer.value = 0;
388 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
392 arg_list.pointer = &arg;
393 arg.type = ACPI_TYPE_INTEGER;
394 arg.integer.value = 1;
400 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
401 if (ACPI_FAILURE(status)) {
409 acpi_eject_store(struct acpi_device *device, const char *buf, size_t count)
416 acpi_object_type type = 0;
418 if ((!count) || (buf[0] != '1')) {
422 if (device->driver == NULL) {
427 status = acpi_get_type(device->handle, &type);
428 if (ACPI_FAILURE(status) || (!device->flags.ejectable)) {
433 islockable = device->flags.lockable;
434 handle = device->handle;
436 if (type == ACPI_TYPE_PROCESSOR)
437 result = acpi_bus_trim(device, 0);
439 result = acpi_bus_trim(device, 1);
442 result = acpi_eject_operation(handle, islockable);
451 /* --------------------------------------------------------------------------
452 Performance Management
453 -------------------------------------------------------------------------- */
455 static int acpi_bus_get_perf_flags(struct acpi_device *device)
457 device->performance.state = ACPI_STATE_UNKNOWN;
461 /* --------------------------------------------------------------------------
463 -------------------------------------------------------------------------- */
465 static LIST_HEAD(acpi_bus_drivers);
466 static DECLARE_MUTEX(acpi_bus_drivers_lock);
469 * acpi_bus_match - match device IDs to driver's supported IDs
470 * @device: the device that we are trying to match to a driver
471 * @driver: driver whose device id table is being checked
473 * Checks the device's hardware (_HID) or compatible (_CID) ids to see if it
474 * matches the specified driver's criteria.
477 acpi_bus_match(struct acpi_device *device, struct acpi_driver *driver)
479 if (driver && driver->ops.match)
480 return driver->ops.match(device, driver);
481 return acpi_match_ids(device, driver->ids);
485 * acpi_bus_driver_init - add a device to a driver
486 * @device: the device to add and initialize
487 * @driver: driver for the device
489 * Used to initialize a device via its device driver. Called whenever a
490 * driver is bound to a device. Invokes the driver's add() and start() ops.
493 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
497 ACPI_FUNCTION_TRACE("acpi_bus_driver_init");
499 if (!device || !driver)
500 return_VALUE(-EINVAL);
502 if (!driver->ops.add)
503 return_VALUE(-ENOSYS);
505 result = driver->ops.add(device);
507 device->driver = NULL;
508 acpi_driver_data(device) = NULL;
509 return_VALUE(result);
512 device->driver = driver;
515 * TBD - Configuration Management: Assign resources to device based
516 * upon possible configuration and currently allocated resources.
519 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
520 "Driver successfully bound to device\n"));
524 static int acpi_start_single_object(struct acpi_device *device)
527 struct acpi_driver *driver;
529 ACPI_FUNCTION_TRACE("acpi_start_single_object");
531 if (!(driver = device->driver))
534 if (driver->ops.start) {
535 result = driver->ops.start(device);
536 if (result && driver->ops.remove)
537 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
540 return_VALUE(result);
543 static int acpi_driver_attach(struct acpi_driver *drv)
545 struct list_head *node, *next;
548 ACPI_FUNCTION_TRACE("acpi_driver_attach");
550 spin_lock(&acpi_device_lock);
551 list_for_each_safe(node, next, &acpi_device_list) {
552 struct acpi_device *dev =
553 container_of(node, struct acpi_device, g_list);
555 if (dev->driver || !dev->status.present)
557 spin_unlock(&acpi_device_lock);
559 if (!acpi_bus_match(dev, drv)) {
560 if (!acpi_bus_driver_init(dev, drv)) {
561 acpi_start_single_object(dev);
562 atomic_inc(&drv->references);
564 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
565 "Found driver [%s] for device [%s]\n",
566 drv->name, dev->pnp.bus_id));
569 spin_lock(&acpi_device_lock);
571 spin_unlock(&acpi_device_lock);
575 static int acpi_driver_detach(struct acpi_driver *drv)
577 struct list_head *node, *next;
579 ACPI_FUNCTION_TRACE("acpi_driver_detach");
581 spin_lock(&acpi_device_lock);
582 list_for_each_safe(node, next, &acpi_device_list) {
583 struct acpi_device *dev =
584 container_of(node, struct acpi_device, g_list);
586 if (dev->driver == drv) {
587 spin_unlock(&acpi_device_lock);
589 drv->ops.remove(dev, ACPI_BUS_REMOVAL_NORMAL);
590 spin_lock(&acpi_device_lock);
592 dev->driver_data = NULL;
593 atomic_dec(&drv->references);
596 spin_unlock(&acpi_device_lock);
601 * acpi_bus_register_driver - register a driver with the ACPI bus
602 * @driver: driver being registered
604 * Registers a driver with the ACPI bus. Searches the namespace for all
605 * devices that match the driver's criteria and binds. Returns the
606 * number of devices that were claimed by the driver, or a negative
607 * error status for failure.
609 int acpi_bus_register_driver(struct acpi_driver *driver)
613 ACPI_FUNCTION_TRACE("acpi_bus_register_driver");
616 return_VALUE(-ENODEV);
619 return_VALUE(-EINVAL);
621 spin_lock(&acpi_device_lock);
622 list_add_tail(&driver->node, &acpi_bus_drivers);
623 spin_unlock(&acpi_device_lock);
624 count = acpi_driver_attach(driver);
629 EXPORT_SYMBOL(acpi_bus_register_driver);
632 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
633 * @driver: driver to unregister
635 * Unregisters a driver with the ACPI bus. Searches the namespace for all
636 * devices that match the driver's criteria and unbinds.
638 int acpi_bus_unregister_driver(struct acpi_driver *driver)
640 ACPI_FUNCTION_TRACE("acpi_bus_unregister_driver");
643 return_VALUE(-EINVAL);
645 acpi_driver_detach(driver);
647 if (!atomic_read(&driver->references)) {
648 spin_lock(&acpi_device_lock);
649 list_del_init(&driver->node);
650 spin_unlock(&acpi_device_lock);
655 EXPORT_SYMBOL(acpi_bus_unregister_driver);
658 * acpi_bus_find_driver - check if there is a driver installed for the device
659 * @device: device that we are trying to find a supporting driver for
661 * Parses the list of registered drivers looking for a driver applicable for
662 * the specified device.
664 static int acpi_bus_find_driver(struct acpi_device *device)
667 struct list_head *node, *next;
669 ACPI_FUNCTION_TRACE("acpi_bus_find_driver");
671 spin_lock(&acpi_device_lock);
672 list_for_each_safe(node, next, &acpi_bus_drivers) {
673 struct acpi_driver *driver =
674 container_of(node, struct acpi_driver, node);
676 atomic_inc(&driver->references);
677 spin_unlock(&acpi_device_lock);
678 if (!acpi_bus_match(device, driver)) {
679 result = acpi_bus_driver_init(device, driver);
683 atomic_dec(&driver->references);
684 spin_lock(&acpi_device_lock);
686 spin_unlock(&acpi_device_lock);
689 return_VALUE(result);
692 /* --------------------------------------------------------------------------
694 -------------------------------------------------------------------------- */
696 static int acpi_bus_get_flags(struct acpi_device *device)
698 acpi_status status = AE_OK;
699 acpi_handle temp = NULL;
701 ACPI_FUNCTION_TRACE("acpi_bus_get_flags");
703 /* Presence of _STA indicates 'dynamic_status' */
704 status = acpi_get_handle(device->handle, "_STA", &temp);
705 if (ACPI_SUCCESS(status))
706 device->flags.dynamic_status = 1;
708 /* Presence of _CID indicates 'compatible_ids' */
709 status = acpi_get_handle(device->handle, "_CID", &temp);
710 if (ACPI_SUCCESS(status))
711 device->flags.compatible_ids = 1;
713 /* Presence of _RMV indicates 'removable' */
714 status = acpi_get_handle(device->handle, "_RMV", &temp);
715 if (ACPI_SUCCESS(status))
716 device->flags.removable = 1;
718 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
719 status = acpi_get_handle(device->handle, "_EJD", &temp);
720 if (ACPI_SUCCESS(status))
721 device->flags.ejectable = 1;
723 status = acpi_get_handle(device->handle, "_EJ0", &temp);
724 if (ACPI_SUCCESS(status))
725 device->flags.ejectable = 1;
728 /* Presence of _LCK indicates 'lockable' */
729 status = acpi_get_handle(device->handle, "_LCK", &temp);
730 if (ACPI_SUCCESS(status))
731 device->flags.lockable = 1;
733 /* Presence of _PS0|_PR0 indicates 'power manageable' */
734 status = acpi_get_handle(device->handle, "_PS0", &temp);
735 if (ACPI_FAILURE(status))
736 status = acpi_get_handle(device->handle, "_PR0", &temp);
737 if (ACPI_SUCCESS(status))
738 device->flags.power_manageable = 1;
740 /* Presence of _PRW indicates wake capable */
741 status = acpi_get_handle(device->handle, "_PRW", &temp);
742 if (ACPI_SUCCESS(status))
743 device->flags.wake_capable = 1;
745 /* TBD: Peformance management */
750 static void acpi_device_get_busid(struct acpi_device *device,
751 acpi_handle handle, int type)
753 char bus_id[5] = { '?', 0 };
754 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
760 * The device's Bus ID is simply the object name.
761 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
764 case ACPI_BUS_TYPE_SYSTEM:
765 strcpy(device->pnp.bus_id, "ACPI");
767 case ACPI_BUS_TYPE_POWER_BUTTON:
768 strcpy(device->pnp.bus_id, "PWRF");
770 case ACPI_BUS_TYPE_SLEEP_BUTTON:
771 strcpy(device->pnp.bus_id, "SLPF");
774 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
775 /* Clean up trailing underscores (if any) */
776 for (i = 3; i > 1; i--) {
777 if (bus_id[i] == '_')
782 strcpy(device->pnp.bus_id, bus_id);
787 static void acpi_device_set_id(struct acpi_device *device,
788 struct acpi_device *parent, acpi_handle handle,
791 struct acpi_device_info *info;
792 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
795 struct acpi_compatible_id_list *cid_list = NULL;
799 case ACPI_BUS_TYPE_DEVICE:
800 status = acpi_get_object_info(handle, &buffer);
801 if (ACPI_FAILURE(status)) {
802 printk("%s: Error reading device info\n", __FUNCTION__);
806 info = buffer.pointer;
807 if (info->valid & ACPI_VALID_HID)
808 hid = info->hardware_id.value;
809 if (info->valid & ACPI_VALID_UID)
810 uid = info->unique_id.value;
811 if (info->valid & ACPI_VALID_CID)
812 cid_list = &info->compatibility_id;
813 if (info->valid & ACPI_VALID_ADR) {
814 device->pnp.bus_address = info->address;
815 device->flags.bus_address = 1;
818 case ACPI_BUS_TYPE_POWER:
819 hid = ACPI_POWER_HID;
821 case ACPI_BUS_TYPE_PROCESSOR:
822 hid = ACPI_PROCESSOR_HID;
824 case ACPI_BUS_TYPE_SYSTEM:
825 hid = ACPI_SYSTEM_HID;
827 case ACPI_BUS_TYPE_THERMAL:
828 hid = ACPI_THERMAL_HID;
830 case ACPI_BUS_TYPE_POWER_BUTTON:
831 hid = ACPI_BUTTON_HID_POWERF;
833 case ACPI_BUS_TYPE_SLEEP_BUTTON:
834 hid = ACPI_BUTTON_HID_SLEEPF;
841 * Fix for the system root bus device -- the only root-level device.
843 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
845 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
846 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
850 strcpy(device->pnp.hardware_id, hid);
851 device->flags.hardware_id = 1;
854 strcpy(device->pnp.unique_id, uid);
855 device->flags.unique_id = 1;
858 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
859 if (device->pnp.cid_list)
860 memcpy(device->pnp.cid_list, cid_list, cid_list->size);
862 printk(KERN_ERR "Memory allocation error\n");
865 acpi_os_free(buffer.pointer);
868 static int acpi_device_set_context(struct acpi_device *device, int type)
870 acpi_status status = AE_OK;
875 * Attach this 'struct acpi_device' to the ACPI object. This makes
876 * resolutions from handle->device very efficient. Note that we need
877 * to be careful with fixed-feature devices as they all attach to the
880 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
881 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
882 status = acpi_attach_data(device->handle,
883 acpi_bus_data_handler, device);
885 if (ACPI_FAILURE(status)) {
886 printk("Error attaching device data\n");
893 static void acpi_device_get_debug_info(struct acpi_device *device,
894 acpi_handle handle, int type)
896 #ifdef CONFIG_ACPI_DEBUG_OUTPUT
897 char *type_string = NULL;
898 char name[80] = { '?', '\0' };
899 struct acpi_buffer buffer = { sizeof(name), name };
902 case ACPI_BUS_TYPE_DEVICE:
903 type_string = "Device";
904 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
906 case ACPI_BUS_TYPE_POWER:
907 type_string = "Power Resource";
908 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
910 case ACPI_BUS_TYPE_PROCESSOR:
911 type_string = "Processor";
912 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
914 case ACPI_BUS_TYPE_SYSTEM:
915 type_string = "System";
916 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
918 case ACPI_BUS_TYPE_THERMAL:
919 type_string = "Thermal Zone";
920 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
922 case ACPI_BUS_TYPE_POWER_BUTTON:
923 type_string = "Power Button";
924 sprintf(name, "PWRB");
926 case ACPI_BUS_TYPE_SLEEP_BUTTON:
927 type_string = "Sleep Button";
928 sprintf(name, "SLPB");
932 printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle);
933 #endif /*CONFIG_ACPI_DEBUG_OUTPUT */
936 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
939 struct acpi_driver *driver;
941 ACPI_FUNCTION_TRACE("acpi_bus_remove");
944 return_VALUE(-EINVAL);
946 driver = dev->driver;
948 if ((driver) && (driver->ops.remove)) {
950 if (driver->ops.stop) {
951 result = driver->ops.stop(dev, ACPI_BUS_REMOVAL_EJECT);
953 return_VALUE(result);
956 result = dev->driver->ops.remove(dev, ACPI_BUS_REMOVAL_EJECT);
958 return_VALUE(result);
961 atomic_dec(&dev->driver->references);
963 acpi_driver_data(dev) = NULL;
969 if (dev->flags.bus_address) {
970 if ((dev->parent) && (dev->parent->ops.unbind))
971 dev->parent->ops.unbind(dev);
974 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
980 acpi_add_single_object(struct acpi_device **child,
981 struct acpi_device *parent, acpi_handle handle, int type)
984 struct acpi_device *device = NULL;
986 ACPI_FUNCTION_TRACE("acpi_add_single_object");
989 return_VALUE(-EINVAL);
991 device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
993 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n"));
994 return_VALUE(-ENOMEM);
996 memset(device, 0, sizeof(struct acpi_device));
998 device->handle = handle;
999 device->parent = parent;
1001 acpi_device_get_busid(device, handle, type);
1006 * Get prior to calling acpi_bus_get_status() so we know whether
1007 * or not _STA is present. Note that we only look for object
1008 * handles -- cannot evaluate objects until we know the device is
1009 * present and properly initialized.
1011 result = acpi_bus_get_flags(device);
1018 * See if the device is present. We always assume that non-Device
1019 * and non-Processor objects (e.g. thermal zones, power resources,
1020 * etc.) are present, functioning, etc. (at least when parent object
1021 * is present). Note that _STA has a different meaning for some
1022 * objects (e.g. power resources) so we need to be careful how we use
1026 case ACPI_BUS_TYPE_PROCESSOR:
1027 case ACPI_BUS_TYPE_DEVICE:
1028 result = acpi_bus_get_status(device);
1029 if (ACPI_FAILURE(result) || !device->status.present) {
1035 STRUCT_TO_INT(device->status) = 0x0F;
1042 * TBD: Synch with Core's enumeration/initialization process.
1046 * Hardware ID, Unique ID, & Bus Address
1047 * -------------------------------------
1049 acpi_device_set_id(device, parent, handle, type);
1055 if (device->flags.power_manageable) {
1056 result = acpi_bus_get_power_flags(device);
1062 * Wakeup device management
1063 *-----------------------
1065 if (device->flags.wake_capable) {
1066 result = acpi_bus_get_wakeup_device_flags(device);
1072 * Performance Management
1073 * ----------------------
1075 if (device->flags.performance_manageable) {
1076 result = acpi_bus_get_perf_flags(device);
1081 if ((result = acpi_device_set_context(device, type)))
1084 acpi_device_get_debug_info(device, handle, type);
1086 acpi_device_register(device, parent);
1089 * Bind _ADR-Based Devices
1090 * -----------------------
1091 * If there's a a bus address (_ADR) then we utilize the parent's
1092 * 'bind' function (if exists) to bind the ACPI- and natively-
1093 * enumerated device representations.
1095 if (device->flags.bus_address) {
1096 if (device->parent && device->parent->ops.bind)
1097 device->parent->ops.bind(device);
1101 * Locate & Attach Driver
1102 * ----------------------
1103 * If there's a hardware id (_HID) or compatible ids (_CID) we check
1104 * to see if there's a driver installed for this kind of device. Note
1105 * that drivers can install before or after a device is enumerated.
1107 * TBD: Assumes LDM provides driver hot-plug capability.
1109 acpi_bus_find_driver(device);
1115 kfree(device->pnp.cid_list);
1119 return_VALUE(result);
1122 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1124 acpi_status status = AE_OK;
1125 struct acpi_device *parent = NULL;
1126 struct acpi_device *child = NULL;
1127 acpi_handle phandle = NULL;
1128 acpi_handle chandle = NULL;
1129 acpi_object_type type = 0;
1132 ACPI_FUNCTION_TRACE("acpi_bus_scan");
1135 return_VALUE(-EINVAL);
1138 phandle = start->handle;
1141 * Parse through the ACPI namespace, identify all 'devices', and
1142 * create a new 'struct acpi_device' for each.
1144 while ((level > 0) && parent) {
1146 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1150 * If this scope is exhausted then move our way back up.
1152 if (ACPI_FAILURE(status)) {
1155 acpi_get_parent(phandle, &phandle);
1157 parent = parent->parent;
1161 status = acpi_get_type(chandle, &type);
1162 if (ACPI_FAILURE(status))
1166 * If this is a scope object then parse it (depth-first).
1168 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1176 * We're only interested in objects that we consider 'devices'.
1179 case ACPI_TYPE_DEVICE:
1180 type = ACPI_BUS_TYPE_DEVICE;
1182 case ACPI_TYPE_PROCESSOR:
1183 type = ACPI_BUS_TYPE_PROCESSOR;
1185 case ACPI_TYPE_THERMAL:
1186 type = ACPI_BUS_TYPE_THERMAL;
1188 case ACPI_TYPE_POWER:
1189 type = ACPI_BUS_TYPE_POWER;
1195 if (ops->acpi_op_add)
1196 status = acpi_add_single_object(&child, parent,
1199 status = acpi_bus_get_device(chandle, &child);
1201 if (ACPI_FAILURE(status))
1204 if (ops->acpi_op_start) {
1205 status = acpi_start_single_object(child);
1206 if (ACPI_FAILURE(status))
1211 * If the device is present, enabled, and functioning then
1212 * parse its scope (depth-first). Note that we need to
1213 * represent absent devices to facilitate PnP notifications
1214 * -- but only the subtree head (not all of its children,
1215 * which will be enumerated when the parent is inserted).
1217 * TBD: Need notifications and other detection mechanisms
1218 * in place before we can fully implement this.
1220 if (child->status.present) {
1221 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1223 if (ACPI_SUCCESS(status)) {
1236 acpi_bus_add(struct acpi_device **child,
1237 struct acpi_device *parent, acpi_handle handle, int type)
1240 struct acpi_bus_ops ops;
1242 ACPI_FUNCTION_TRACE("acpi_bus_add");
1244 result = acpi_add_single_object(child, parent, handle, type);
1246 memset(&ops, 0, sizeof(ops));
1247 ops.acpi_op_add = 1;
1248 result = acpi_bus_scan(*child, &ops);
1250 return_VALUE(result);
1253 EXPORT_SYMBOL(acpi_bus_add);
1255 int acpi_bus_start(struct acpi_device *device)
1258 struct acpi_bus_ops ops;
1260 ACPI_FUNCTION_TRACE("acpi_bus_start");
1263 return_VALUE(-EINVAL);
1265 result = acpi_start_single_object(device);
1267 memset(&ops, 0, sizeof(ops));
1268 ops.acpi_op_start = 1;
1269 result = acpi_bus_scan(device, &ops);
1271 return_VALUE(result);
1274 EXPORT_SYMBOL(acpi_bus_start);
1276 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1279 struct acpi_device *parent, *child;
1280 acpi_handle phandle, chandle;
1281 acpi_object_type type;
1286 phandle = start->handle;
1287 child = chandle = NULL;
1289 while ((level > 0) && parent && (!err)) {
1290 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1294 * If this scope is exhausted then move our way back up.
1296 if (ACPI_FAILURE(status)) {
1299 acpi_get_parent(phandle, &phandle);
1301 parent = parent->parent;
1304 err = acpi_bus_remove(child, rmdevice);
1306 err = acpi_bus_remove(child, 1);
1311 status = acpi_get_type(chandle, &type);
1312 if (ACPI_FAILURE(status)) {
1316 * If there is a device corresponding to chandle then
1317 * parse it (depth-first).
1319 if (acpi_bus_get_device(chandle, &child) == 0) {
1329 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1332 static int acpi_bus_scan_fixed(struct acpi_device *root)
1335 struct acpi_device *device = NULL;
1337 ACPI_FUNCTION_TRACE("acpi_bus_scan_fixed");
1340 return_VALUE(-ENODEV);
1343 * Enumerate all fixed-feature devices.
1345 if (acpi_fadt.pwr_button == 0) {
1346 result = acpi_add_single_object(&device, acpi_root,
1348 ACPI_BUS_TYPE_POWER_BUTTON);
1350 result = acpi_start_single_object(device);
1353 if (acpi_fadt.sleep_button == 0) {
1354 result = acpi_add_single_object(&device, acpi_root,
1356 ACPI_BUS_TYPE_SLEEP_BUTTON);
1358 result = acpi_start_single_object(device);
1361 return_VALUE(result);
1364 static int __init acpi_scan_init(void)
1367 struct acpi_bus_ops ops;
1369 ACPI_FUNCTION_TRACE("acpi_scan_init");
1374 kset_register(&acpi_namespace_kset);
1377 * Create the root device in the bus's device tree
1379 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1380 ACPI_BUS_TYPE_SYSTEM);
1384 result = acpi_start_single_object(acpi_root);
1387 * Enumerate devices in the ACPI namespace.
1389 result = acpi_bus_scan_fixed(acpi_root);
1391 memset(&ops, 0, sizeof(ops));
1392 ops.acpi_op_add = 1;
1393 ops.acpi_op_start = 1;
1394 result = acpi_bus_scan(acpi_root, &ops);
1398 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1401 return_VALUE(result);
1404 subsys_initcall(acpi_scan_init);