Merge master.kernel.org:/pub/scm/linux/kernel/git/dtor/input
[linux-2.6] / drivers / acpi / scan.c
1 /*
2  * scan.c - support for transforming the ACPI namespace into individual objects
3  */
4
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/acpi.h>
8
9 #include <acpi/acpi_drivers.h>
10 #include <acpi/acinterp.h>      /* for acpi_ex_eisa_id_to_string() */
11
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;
16
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"
21
22 static LIST_HEAD(acpi_device_list);
23 DEFINE_SPINLOCK(acpi_device_lock);
24 LIST_HEAD(acpi_wakeup_device_list);
25
26 static int acpi_bus_trim(struct acpi_device *start, int rmdevice);
27
28 static void acpi_device_release(struct kobject *kobj)
29 {
30         struct acpi_device *dev = container_of(kobj, struct acpi_device, kobj);
31         kfree(dev->pnp.cid_list);
32         kfree(dev);
33 }
34
35 struct acpi_device_attribute {
36         struct attribute attr;
37          ssize_t(*show) (struct acpi_device *, char *);
38          ssize_t(*store) (struct acpi_device *, const char *, size_t);
39 };
40
41 typedef void acpi_device_sysfs_files(struct kobject *,
42                                      const struct attribute *);
43
44 static void setup_sys_fs_device_files(struct acpi_device *dev,
45                                       acpi_device_sysfs_files * func);
46
47 #define create_sysfs_device_files(dev)  \
48         setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file)
49 #define remove_sysfs_device_files(dev)  \
50         setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file)
51
52 #define to_acpi_device(n) container_of(n, struct acpi_device, kobj)
53 #define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr);
54
55 static ssize_t acpi_device_attr_show(struct kobject *kobj,
56                                      struct attribute *attr, char *buf)
57 {
58         struct acpi_device *device = to_acpi_device(kobj);
59         struct acpi_device_attribute *attribute = to_handle_attr(attr);
60         return attribute->show ? attribute->show(device, buf) : -EIO;
61 }
62 static ssize_t acpi_device_attr_store(struct kobject *kobj,
63                                       struct attribute *attr, const char *buf,
64                                       size_t len)
65 {
66         struct acpi_device *device = to_acpi_device(kobj);
67         struct acpi_device_attribute *attribute = to_handle_attr(attr);
68         return attribute->store ? attribute->store(device, buf, len) : -EIO;
69 }
70
71 static struct sysfs_ops acpi_device_sysfs_ops = {
72         .show = acpi_device_attr_show,
73         .store = acpi_device_attr_store,
74 };
75
76 static struct kobj_type ktype_acpi_ns = {
77         .sysfs_ops = &acpi_device_sysfs_ops,
78         .release = acpi_device_release,
79 };
80
81 static int namespace_uevent(struct kset *kset, struct kobject *kobj,
82                              char **envp, int num_envp, char *buffer,
83                              int buffer_size)
84 {
85         struct acpi_device *dev = to_acpi_device(kobj);
86         int i = 0;
87         int len = 0;
88
89         if (!dev->driver)
90                 return 0;
91
92         if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
93                            "PHYSDEVDRIVER=%s", dev->driver->name))
94                 return -ENOMEM;
95
96         envp[i] = NULL;
97
98         return 0;
99 }
100
101 static struct kset_uevent_ops namespace_uevent_ops = {
102         .uevent = &namespace_uevent,
103 };
104
105 static struct kset acpi_namespace_kset = {
106         .kobj = {
107                  .name = "namespace",
108                  },
109         .subsys = &acpi_subsys,
110         .ktype = &ktype_acpi_ns,
111         .uevent_ops = &namespace_uevent_ops,
112 };
113
114 static void acpi_device_register(struct acpi_device *device,
115                                  struct acpi_device *parent)
116 {
117         /*
118          * Linkage
119          * -------
120          * Link this device to its parent and siblings.
121          */
122         INIT_LIST_HEAD(&device->children);
123         INIT_LIST_HEAD(&device->node);
124         INIT_LIST_HEAD(&device->g_list);
125         INIT_LIST_HEAD(&device->wakeup_list);
126
127         spin_lock(&acpi_device_lock);
128         if (device->parent) {
129                 list_add_tail(&device->node, &device->parent->children);
130                 list_add_tail(&device->g_list, &device->parent->g_list);
131         } else
132                 list_add_tail(&device->g_list, &acpi_device_list);
133         if (device->wakeup.flags.valid)
134                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
135         spin_unlock(&acpi_device_lock);
136
137         strlcpy(device->kobj.name, device->pnp.bus_id, KOBJ_NAME_LEN);
138         if (parent)
139                 device->kobj.parent = &parent->kobj;
140         device->kobj.ktype = &ktype_acpi_ns;
141         device->kobj.kset = &acpi_namespace_kset;
142         kobject_register(&device->kobj);
143         create_sysfs_device_files(device);
144 }
145
146 static int acpi_device_unregister(struct acpi_device *device, int type)
147 {
148         spin_lock(&acpi_device_lock);
149         if (device->parent) {
150                 list_del(&device->node);
151                 list_del(&device->g_list);
152         } else
153                 list_del(&device->g_list);
154
155         list_del(&device->wakeup_list);
156
157         spin_unlock(&acpi_device_lock);
158
159         acpi_detach_data(device->handle, acpi_bus_data_handler);
160         remove_sysfs_device_files(device);
161         kobject_unregister(&device->kobj);
162         return 0;
163 }
164
165 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
166 {
167         ACPI_FUNCTION_TRACE("acpi_bus_data_handler");
168
169         /* TBD */
170
171         return_VOID;
172 }
173
174 static int acpi_bus_get_power_flags(struct acpi_device *device)
175 {
176         acpi_status status = 0;
177         acpi_handle handle = NULL;
178         u32 i = 0;
179
180         ACPI_FUNCTION_TRACE("acpi_bus_get_power_flags");
181
182         /*
183          * Power Management Flags
184          */
185         status = acpi_get_handle(device->handle, "_PSC", &handle);
186         if (ACPI_SUCCESS(status))
187                 device->power.flags.explicit_get = 1;
188         status = acpi_get_handle(device->handle, "_IRC", &handle);
189         if (ACPI_SUCCESS(status))
190                 device->power.flags.inrush_current = 1;
191
192         /*
193          * Enumerate supported power management states
194          */
195         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
196                 struct acpi_device_power_state *ps = &device->power.states[i];
197                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
198
199                 /* Evaluate "_PRx" to se if power resources are referenced */
200                 acpi_evaluate_reference(device->handle, object_name, NULL,
201                                         &ps->resources);
202                 if (ps->resources.count) {
203                         device->power.flags.power_resources = 1;
204                         ps->flags.valid = 1;
205                 }
206
207                 /* Evaluate "_PSx" to see if we can do explicit sets */
208                 object_name[2] = 'S';
209                 status = acpi_get_handle(device->handle, object_name, &handle);
210                 if (ACPI_SUCCESS(status)) {
211                         ps->flags.explicit_set = 1;
212                         ps->flags.valid = 1;
213                 }
214
215                 /* State is valid if we have some power control */
216                 if (ps->resources.count || ps->flags.explicit_set)
217                         ps->flags.valid = 1;
218
219                 ps->power = -1; /* Unknown - driver assigned */
220                 ps->latency = -1;       /* Unknown - driver assigned */
221         }
222
223         /* Set defaults for D0 and D3 states (always valid) */
224         device->power.states[ACPI_STATE_D0].flags.valid = 1;
225         device->power.states[ACPI_STATE_D0].power = 100;
226         device->power.states[ACPI_STATE_D3].flags.valid = 1;
227         device->power.states[ACPI_STATE_D3].power = 0;
228
229         /* TBD: System wake support and resource requirements. */
230
231         device->power.state = ACPI_STATE_UNKNOWN;
232
233         return_VALUE(0);
234 }
235
236 int acpi_match_ids(struct acpi_device *device, char *ids)
237 {
238         int error = 0;
239         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
240
241         if (device->flags.hardware_id)
242                 if (strstr(ids, device->pnp.hardware_id))
243                         goto Done;
244
245         if (device->flags.compatible_ids) {
246                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
247                 int i;
248
249                 /* compare multiple _CID entries against driver ids */
250                 for (i = 0; i < cid_list->count; i++) {
251                         if (strstr(ids, cid_list->id[i].value))
252                                 goto Done;
253                 }
254         }
255         error = -ENOENT;
256
257       Done:
258         if (buffer.pointer)
259                 acpi_os_free(buffer.pointer);
260         return error;
261 }
262
263 static acpi_status
264 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
265                                              union acpi_object *package)
266 {
267         int i = 0;
268         union acpi_object *element = NULL;
269
270         if (!device || !package || (package->package.count < 2))
271                 return AE_BAD_PARAMETER;
272
273         element = &(package->package.elements[0]);
274         if (!element)
275                 return AE_BAD_PARAMETER;
276         if (element->type == ACPI_TYPE_PACKAGE) {
277                 if ((element->package.count < 2) ||
278                     (element->package.elements[0].type !=
279                      ACPI_TYPE_LOCAL_REFERENCE)
280                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
281                         return AE_BAD_DATA;
282                 device->wakeup.gpe_device =
283                     element->package.elements[0].reference.handle;
284                 device->wakeup.gpe_number =
285                     (u32) element->package.elements[1].integer.value;
286         } else if (element->type == ACPI_TYPE_INTEGER) {
287                 device->wakeup.gpe_number = element->integer.value;
288         } else
289                 return AE_BAD_DATA;
290
291         element = &(package->package.elements[1]);
292         if (element->type != ACPI_TYPE_INTEGER) {
293                 return AE_BAD_DATA;
294         }
295         device->wakeup.sleep_state = element->integer.value;
296
297         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
298                 return AE_NO_MEMORY;
299         }
300         device->wakeup.resources.count = package->package.count - 2;
301         for (i = 0; i < device->wakeup.resources.count; i++) {
302                 element = &(package->package.elements[i + 2]);
303                 if (element->type != ACPI_TYPE_ANY) {
304                         return AE_BAD_DATA;
305                 }
306
307                 device->wakeup.resources.handles[i] = element->reference.handle;
308         }
309
310         return AE_OK;
311 }
312
313 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
314 {
315         acpi_status status = 0;
316         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
317         union acpi_object *package = NULL;
318
319         ACPI_FUNCTION_TRACE("acpi_bus_get_wakeup_flags");
320
321         /* _PRW */
322         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
323         if (ACPI_FAILURE(status)) {
324                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRW\n"));
325                 goto end;
326         }
327
328         package = (union acpi_object *)buffer.pointer;
329         status = acpi_bus_extract_wakeup_device_power_package(device, package);
330         if (ACPI_FAILURE(status)) {
331                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
332                                   "Error extracting _PRW package\n"));
333                 goto end;
334         }
335
336         acpi_os_free(buffer.pointer);
337
338         device->wakeup.flags.valid = 1;
339         /* Power button, Lid switch always enable wakeup */
340         if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E"))
341                 device->wakeup.flags.run_wake = 1;
342
343       end:
344         if (ACPI_FAILURE(status))
345                 device->flags.wake_capable = 0;
346         return_VALUE(0);
347 }
348
349 /* --------------------------------------------------------------------------
350                 ACPI sysfs device file support
351    -------------------------------------------------------------------------- */
352 static ssize_t acpi_eject_store(struct acpi_device *device,
353                                 const char *buf, size_t count);
354
355 #define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \
356 static struct acpi_device_attribute acpi_device_attr_##_name = \
357                 __ATTR(_name, _mode, _show, _store)
358
359 ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
360
361 /**
362  * setup_sys_fs_device_files - sets up the device files under device namespace
363  * @dev:        acpi_device object
364  * @func:       function pointer to create or destroy the device file
365  */
366 static void
367 setup_sys_fs_device_files(struct acpi_device *dev,
368                           acpi_device_sysfs_files * func)
369 {
370         acpi_status status;
371         acpi_handle temp = NULL;
372
373         /*
374          * If device has _EJ0, 'eject' file is created that is used to trigger
375          * hot-removal function from userland.
376          */
377         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
378         if (ACPI_SUCCESS(status))
379                 (*(func)) (&dev->kobj, &acpi_device_attr_eject.attr);
380 }
381
382 static int acpi_eject_operation(acpi_handle handle, int lockable)
383 {
384         struct acpi_object_list arg_list;
385         union acpi_object arg;
386         acpi_status status = AE_OK;
387
388         /*
389          * TBD: evaluate _PS3?
390          */
391
392         if (lockable) {
393                 arg_list.count = 1;
394                 arg_list.pointer = &arg;
395                 arg.type = ACPI_TYPE_INTEGER;
396                 arg.integer.value = 0;
397                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
398         }
399
400         arg_list.count = 1;
401         arg_list.pointer = &arg;
402         arg.type = ACPI_TYPE_INTEGER;
403         arg.integer.value = 1;
404
405         /*
406          * TBD: _EJD support.
407          */
408
409         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
410         if (ACPI_FAILURE(status)) {
411                 return (-ENODEV);
412         }
413
414         return (0);
415 }
416
417 static ssize_t
418 acpi_eject_store(struct acpi_device *device, const char *buf, size_t count)
419 {
420         int result;
421         int ret = count;
422         int islockable;
423         acpi_status status;
424         acpi_handle handle;
425         acpi_object_type type = 0;
426
427         if ((!count) || (buf[0] != '1')) {
428                 return -EINVAL;
429         }
430 #ifndef FORCE_EJECT
431         if (device->driver == NULL) {
432                 ret = -ENODEV;
433                 goto err;
434         }
435 #endif
436         status = acpi_get_type(device->handle, &type);
437         if (ACPI_FAILURE(status) || (!device->flags.ejectable)) {
438                 ret = -ENODEV;
439                 goto err;
440         }
441
442         islockable = device->flags.lockable;
443         handle = device->handle;
444
445         if (type == ACPI_TYPE_PROCESSOR)
446                 result = acpi_bus_trim(device, 0);
447         else
448                 result = acpi_bus_trim(device, 1);
449
450         if (!result)
451                 result = acpi_eject_operation(handle, islockable);
452
453         if (result) {
454                 ret = -EBUSY;
455         }
456       err:
457         return ret;
458 }
459
460 /* --------------------------------------------------------------------------
461                               Performance Management
462    -------------------------------------------------------------------------- */
463
464 static int acpi_bus_get_perf_flags(struct acpi_device *device)
465 {
466         device->performance.state = ACPI_STATE_UNKNOWN;
467         return 0;
468 }
469
470 /* --------------------------------------------------------------------------
471                                  Driver Management
472    -------------------------------------------------------------------------- */
473
474 static LIST_HEAD(acpi_bus_drivers);
475 static DECLARE_MUTEX(acpi_bus_drivers_lock);
476
477 /**
478  * acpi_bus_match - match device IDs to driver's supported IDs
479  * @device: the device that we are trying to match to a driver
480  * @driver: driver whose device id table is being checked
481  *
482  * Checks the device's hardware (_HID) or compatible (_CID) ids to see if it
483  * matches the specified driver's criteria.
484  */
485 static int
486 acpi_bus_match(struct acpi_device *device, struct acpi_driver *driver)
487 {
488         if (driver && driver->ops.match)
489                 return driver->ops.match(device, driver);
490         return acpi_match_ids(device, driver->ids);
491 }
492
493 /**
494  * acpi_bus_driver_init - add a device to a driver
495  * @device: the device to add and initialize
496  * @driver: driver for the device
497  *
498  * Used to initialize a device via its device driver.  Called whenever a 
499  * driver is bound to a device.  Invokes the driver's add() and start() ops.
500  */
501 static int
502 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
503 {
504         int result = 0;
505
506         ACPI_FUNCTION_TRACE("acpi_bus_driver_init");
507
508         if (!device || !driver)
509                 return_VALUE(-EINVAL);
510
511         if (!driver->ops.add)
512                 return_VALUE(-ENOSYS);
513
514         result = driver->ops.add(device);
515         if (result) {
516                 device->driver = NULL;
517                 acpi_driver_data(device) = NULL;
518                 return_VALUE(result);
519         }
520
521         device->driver = driver;
522
523         /*
524          * TBD - Configuration Management: Assign resources to device based
525          * upon possible configuration and currently allocated resources.
526          */
527
528         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
529                           "Driver successfully bound to device\n"));
530         return_VALUE(0);
531 }
532
533 static int acpi_start_single_object(struct acpi_device *device)
534 {
535         int result = 0;
536         struct acpi_driver *driver;
537
538         ACPI_FUNCTION_TRACE("acpi_start_single_object");
539
540         if (!(driver = device->driver))
541                 return_VALUE(0);
542
543         if (driver->ops.start) {
544                 result = driver->ops.start(device);
545                 if (result && driver->ops.remove)
546                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
547         }
548
549         return_VALUE(result);
550 }
551
552 static int acpi_driver_attach(struct acpi_driver *drv)
553 {
554         struct list_head *node, *next;
555         int count = 0;
556
557         ACPI_FUNCTION_TRACE("acpi_driver_attach");
558
559         spin_lock(&acpi_device_lock);
560         list_for_each_safe(node, next, &acpi_device_list) {
561                 struct acpi_device *dev =
562                     container_of(node, struct acpi_device, g_list);
563
564                 if (dev->driver || !dev->status.present)
565                         continue;
566                 spin_unlock(&acpi_device_lock);
567
568                 if (!acpi_bus_match(dev, drv)) {
569                         if (!acpi_bus_driver_init(dev, drv)) {
570                                 acpi_start_single_object(dev);
571                                 atomic_inc(&drv->references);
572                                 count++;
573                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
574                                                   "Found driver [%s] for device [%s]\n",
575                                                   drv->name, dev->pnp.bus_id));
576                         }
577                 }
578                 spin_lock(&acpi_device_lock);
579         }
580         spin_unlock(&acpi_device_lock);
581         return_VALUE(count);
582 }
583
584 static int acpi_driver_detach(struct acpi_driver *drv)
585 {
586         struct list_head *node, *next;
587
588         ACPI_FUNCTION_TRACE("acpi_driver_detach");
589
590         spin_lock(&acpi_device_lock);
591         list_for_each_safe(node, next, &acpi_device_list) {
592                 struct acpi_device *dev =
593                     container_of(node, struct acpi_device, g_list);
594
595                 if (dev->driver == drv) {
596                         spin_unlock(&acpi_device_lock);
597                         if (drv->ops.remove)
598                                 drv->ops.remove(dev, ACPI_BUS_REMOVAL_NORMAL);
599                         spin_lock(&acpi_device_lock);
600                         dev->driver = NULL;
601                         dev->driver_data = NULL;
602                         atomic_dec(&drv->references);
603                 }
604         }
605         spin_unlock(&acpi_device_lock);
606         return_VALUE(0);
607 }
608
609 /**
610  * acpi_bus_register_driver - register a driver with the ACPI bus
611  * @driver: driver being registered
612  *
613  * Registers a driver with the ACPI bus.  Searches the namespace for all
614  * devices that match the driver's criteria and binds.  Returns the
615  * number of devices that were claimed by the driver, or a negative
616  * error status for failure.
617  */
618 int acpi_bus_register_driver(struct acpi_driver *driver)
619 {
620         int count;
621
622         ACPI_FUNCTION_TRACE("acpi_bus_register_driver");
623
624         if (acpi_disabled)
625                 return_VALUE(-ENODEV);
626
627         if (!driver)
628                 return_VALUE(-EINVAL);
629
630         spin_lock(&acpi_device_lock);
631         list_add_tail(&driver->node, &acpi_bus_drivers);
632         spin_unlock(&acpi_device_lock);
633         count = acpi_driver_attach(driver);
634
635         return_VALUE(count);
636 }
637
638 EXPORT_SYMBOL(acpi_bus_register_driver);
639
640 /**
641  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
642  * @driver: driver to unregister
643  *
644  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
645  * devices that match the driver's criteria and unbinds.
646  */
647 int acpi_bus_unregister_driver(struct acpi_driver *driver)
648 {
649         int error = 0;
650
651         ACPI_FUNCTION_TRACE("acpi_bus_unregister_driver");
652
653         if (driver) {
654                 acpi_driver_detach(driver);
655
656                 if (!atomic_read(&driver->references)) {
657                         spin_lock(&acpi_device_lock);
658                         list_del_init(&driver->node);
659                         spin_unlock(&acpi_device_lock);
660                 }
661         } else
662                 error = -EINVAL;
663         return_VALUE(error);
664 }
665
666 EXPORT_SYMBOL(acpi_bus_unregister_driver);
667
668 /**
669  * acpi_bus_find_driver - check if there is a driver installed for the device
670  * @device: device that we are trying to find a supporting driver for
671  *
672  * Parses the list of registered drivers looking for a driver applicable for
673  * the specified device.
674  */
675 static int acpi_bus_find_driver(struct acpi_device *device)
676 {
677         int result = 0;
678         struct list_head *node, *next;
679
680         ACPI_FUNCTION_TRACE("acpi_bus_find_driver");
681
682         spin_lock(&acpi_device_lock);
683         list_for_each_safe(node, next, &acpi_bus_drivers) {
684                 struct acpi_driver *driver =
685                     container_of(node, struct acpi_driver, node);
686
687                 atomic_inc(&driver->references);
688                 spin_unlock(&acpi_device_lock);
689                 if (!acpi_bus_match(device, driver)) {
690                         result = acpi_bus_driver_init(device, driver);
691                         if (!result)
692                                 goto Done;
693                 }
694                 atomic_dec(&driver->references);
695                 spin_lock(&acpi_device_lock);
696         }
697         spin_unlock(&acpi_device_lock);
698
699       Done:
700         return_VALUE(result);
701 }
702
703 /* --------------------------------------------------------------------------
704                                  Device Enumeration
705    -------------------------------------------------------------------------- */
706
707 static int acpi_bus_get_flags(struct acpi_device *device)
708 {
709         acpi_status status = AE_OK;
710         acpi_handle temp = NULL;
711
712         ACPI_FUNCTION_TRACE("acpi_bus_get_flags");
713
714         /* Presence of _STA indicates 'dynamic_status' */
715         status = acpi_get_handle(device->handle, "_STA", &temp);
716         if (ACPI_SUCCESS(status))
717                 device->flags.dynamic_status = 1;
718
719         /* Presence of _CID indicates 'compatible_ids' */
720         status = acpi_get_handle(device->handle, "_CID", &temp);
721         if (ACPI_SUCCESS(status))
722                 device->flags.compatible_ids = 1;
723
724         /* Presence of _RMV indicates 'removable' */
725         status = acpi_get_handle(device->handle, "_RMV", &temp);
726         if (ACPI_SUCCESS(status))
727                 device->flags.removable = 1;
728
729         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
730         status = acpi_get_handle(device->handle, "_EJD", &temp);
731         if (ACPI_SUCCESS(status))
732                 device->flags.ejectable = 1;
733         else {
734                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
735                 if (ACPI_SUCCESS(status))
736                         device->flags.ejectable = 1;
737         }
738
739         /* Presence of _LCK indicates 'lockable' */
740         status = acpi_get_handle(device->handle, "_LCK", &temp);
741         if (ACPI_SUCCESS(status))
742                 device->flags.lockable = 1;
743
744         /* Presence of _PS0|_PR0 indicates 'power manageable' */
745         status = acpi_get_handle(device->handle, "_PS0", &temp);
746         if (ACPI_FAILURE(status))
747                 status = acpi_get_handle(device->handle, "_PR0", &temp);
748         if (ACPI_SUCCESS(status))
749                 device->flags.power_manageable = 1;
750
751         /* Presence of _PRW indicates wake capable */
752         status = acpi_get_handle(device->handle, "_PRW", &temp);
753         if (ACPI_SUCCESS(status))
754                 device->flags.wake_capable = 1;
755
756         /* TBD: Peformance management */
757
758         return_VALUE(0);
759 }
760
761 static void acpi_device_get_busid(struct acpi_device *device,
762                                   acpi_handle handle, int type)
763 {
764         char bus_id[5] = { '?', 0 };
765         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
766         int i = 0;
767
768         /*
769          * Bus ID
770          * ------
771          * The device's Bus ID is simply the object name.
772          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
773          */
774         switch (type) {
775         case ACPI_BUS_TYPE_SYSTEM:
776                 strcpy(device->pnp.bus_id, "ACPI");
777                 break;
778         case ACPI_BUS_TYPE_POWER_BUTTON:
779                 strcpy(device->pnp.bus_id, "PWRF");
780                 break;
781         case ACPI_BUS_TYPE_SLEEP_BUTTON:
782                 strcpy(device->pnp.bus_id, "SLPF");
783                 break;
784         default:
785                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
786                 /* Clean up trailing underscores (if any) */
787                 for (i = 3; i > 1; i--) {
788                         if (bus_id[i] == '_')
789                                 bus_id[i] = '\0';
790                         else
791                                 break;
792                 }
793                 strcpy(device->pnp.bus_id, bus_id);
794                 break;
795         }
796 }
797
798 static void acpi_device_set_id(struct acpi_device *device,
799                                struct acpi_device *parent, acpi_handle handle,
800                                int type)
801 {
802         struct acpi_device_info *info;
803         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
804         char *hid = NULL;
805         char *uid = NULL;
806         struct acpi_compatible_id_list *cid_list = NULL;
807         acpi_status status;
808
809         switch (type) {
810         case ACPI_BUS_TYPE_DEVICE:
811                 status = acpi_get_object_info(handle, &buffer);
812                 if (ACPI_FAILURE(status)) {
813                         printk("%s: Error reading device info\n", __FUNCTION__);
814                         return;
815                 }
816
817                 info = buffer.pointer;
818                 if (info->valid & ACPI_VALID_HID)
819                         hid = info->hardware_id.value;
820                 if (info->valid & ACPI_VALID_UID)
821                         uid = info->unique_id.value;
822                 if (info->valid & ACPI_VALID_CID)
823                         cid_list = &info->compatibility_id;
824                 if (info->valid & ACPI_VALID_ADR) {
825                         device->pnp.bus_address = info->address;
826                         device->flags.bus_address = 1;
827                 }
828                 break;
829         case ACPI_BUS_TYPE_POWER:
830                 hid = ACPI_POWER_HID;
831                 break;
832         case ACPI_BUS_TYPE_PROCESSOR:
833                 hid = ACPI_PROCESSOR_HID;
834                 break;
835         case ACPI_BUS_TYPE_SYSTEM:
836                 hid = ACPI_SYSTEM_HID;
837                 break;
838         case ACPI_BUS_TYPE_THERMAL:
839                 hid = ACPI_THERMAL_HID;
840                 break;
841         case ACPI_BUS_TYPE_POWER_BUTTON:
842                 hid = ACPI_BUTTON_HID_POWERF;
843                 break;
844         case ACPI_BUS_TYPE_SLEEP_BUTTON:
845                 hid = ACPI_BUTTON_HID_SLEEPF;
846                 break;
847         }
848
849         /* 
850          * \_SB
851          * ----
852          * Fix for the system root bus device -- the only root-level device.
853          */
854         if ((parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
855                 hid = ACPI_BUS_HID;
856                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
857                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
858         }
859
860         if (hid) {
861                 strcpy(device->pnp.hardware_id, hid);
862                 device->flags.hardware_id = 1;
863         }
864         if (uid) {
865                 strcpy(device->pnp.unique_id, uid);
866                 device->flags.unique_id = 1;
867         }
868         if (cid_list) {
869                 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
870                 if (device->pnp.cid_list)
871                         memcpy(device->pnp.cid_list, cid_list, cid_list->size);
872                 else
873                         printk(KERN_ERR "Memory allocation error\n");
874         }
875
876         acpi_os_free(buffer.pointer);
877 }
878
879 static int acpi_device_set_context(struct acpi_device *device, int type)
880 {
881         acpi_status status = AE_OK;
882         int result = 0;
883         /*
884          * Context
885          * -------
886          * Attach this 'struct acpi_device' to the ACPI object.  This makes
887          * resolutions from handle->device very efficient.  Note that we need
888          * to be careful with fixed-feature devices as they all attach to the
889          * root object.
890          */
891         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
892             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
893                 status = acpi_attach_data(device->handle,
894                                           acpi_bus_data_handler, device);
895
896                 if (ACPI_FAILURE(status)) {
897                         printk("Error attaching device data\n");
898                         result = -ENODEV;
899                 }
900         }
901         return result;
902 }
903
904 static void acpi_device_get_debug_info(struct acpi_device *device,
905                                        acpi_handle handle, int type)
906 {
907 #ifdef CONFIG_ACPI_DEBUG_OUTPUT
908         char *type_string = NULL;
909         char name[80] = { '?', '\0' };
910         struct acpi_buffer buffer = { sizeof(name), name };
911
912         switch (type) {
913         case ACPI_BUS_TYPE_DEVICE:
914                 type_string = "Device";
915                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
916                 break;
917         case ACPI_BUS_TYPE_POWER:
918                 type_string = "Power Resource";
919                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
920                 break;
921         case ACPI_BUS_TYPE_PROCESSOR:
922                 type_string = "Processor";
923                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
924                 break;
925         case ACPI_BUS_TYPE_SYSTEM:
926                 type_string = "System";
927                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
928                 break;
929         case ACPI_BUS_TYPE_THERMAL:
930                 type_string = "Thermal Zone";
931                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
932                 break;
933         case ACPI_BUS_TYPE_POWER_BUTTON:
934                 type_string = "Power Button";
935                 sprintf(name, "PWRB");
936                 break;
937         case ACPI_BUS_TYPE_SLEEP_BUTTON:
938                 type_string = "Sleep Button";
939                 sprintf(name, "SLPB");
940                 break;
941         }
942
943         printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle);
944 #endif                          /*CONFIG_ACPI_DEBUG_OUTPUT */
945 }
946
947 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
948 {
949         int result = 0;
950         struct acpi_driver *driver;
951
952         ACPI_FUNCTION_TRACE("acpi_bus_remove");
953
954         if (!dev)
955                 return_VALUE(-EINVAL);
956
957         driver = dev->driver;
958
959         if ((driver) && (driver->ops.remove)) {
960
961                 if (driver->ops.stop) {
962                         result = driver->ops.stop(dev, ACPI_BUS_REMOVAL_EJECT);
963                         if (result)
964                                 return_VALUE(result);
965                 }
966
967                 result = dev->driver->ops.remove(dev, ACPI_BUS_REMOVAL_EJECT);
968                 if (result) {
969                         return_VALUE(result);
970                 }
971
972                 atomic_dec(&dev->driver->references);
973                 dev->driver = NULL;
974                 acpi_driver_data(dev) = NULL;
975         }
976
977         if (!rmdevice)
978                 return_VALUE(0);
979
980         if (dev->flags.bus_address) {
981                 if ((dev->parent) && (dev->parent->ops.unbind))
982                         dev->parent->ops.unbind(dev);
983         }
984
985         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
986
987         return_VALUE(0);
988 }
989
990 static int
991 acpi_add_single_object(struct acpi_device **child,
992                        struct acpi_device *parent, acpi_handle handle, int type)
993 {
994         int result = 0;
995         struct acpi_device *device = NULL;
996
997         ACPI_FUNCTION_TRACE("acpi_add_single_object");
998
999         if (!child)
1000                 return_VALUE(-EINVAL);
1001
1002         device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
1003         if (!device) {
1004                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n"));
1005                 return_VALUE(-ENOMEM);
1006         }
1007         memset(device, 0, sizeof(struct acpi_device));
1008
1009         device->handle = handle;
1010         device->parent = parent;
1011
1012         acpi_device_get_busid(device, handle, type);
1013
1014         /*
1015          * Flags
1016          * -----
1017          * Get prior to calling acpi_bus_get_status() so we know whether
1018          * or not _STA is present.  Note that we only look for object
1019          * handles -- cannot evaluate objects until we know the device is
1020          * present and properly initialized.
1021          */
1022         result = acpi_bus_get_flags(device);
1023         if (result)
1024                 goto end;
1025
1026         /*
1027          * Status
1028          * ------
1029          * See if the device is present.  We always assume that non-Device
1030          * and non-Processor objects (e.g. thermal zones, power resources,
1031          * etc.) are present, functioning, etc. (at least when parent object
1032          * is present).  Note that _STA has a different meaning for some
1033          * objects (e.g. power resources) so we need to be careful how we use
1034          * it.
1035          */
1036         switch (type) {
1037         case ACPI_BUS_TYPE_PROCESSOR:
1038         case ACPI_BUS_TYPE_DEVICE:
1039                 result = acpi_bus_get_status(device);
1040                 if (ACPI_FAILURE(result) || !device->status.present) {
1041                         result = -ENOENT;
1042                         goto end;
1043                 }
1044                 break;
1045         default:
1046                 STRUCT_TO_INT(device->status) = 0x0F;
1047                 break;
1048         }
1049
1050         /*
1051          * Initialize Device
1052          * -----------------
1053          * TBD: Synch with Core's enumeration/initialization process.
1054          */
1055
1056         /*
1057          * Hardware ID, Unique ID, & Bus Address
1058          * -------------------------------------
1059          */
1060         acpi_device_set_id(device, parent, handle, type);
1061
1062         /*
1063          * Power Management
1064          * ----------------
1065          */
1066         if (device->flags.power_manageable) {
1067                 result = acpi_bus_get_power_flags(device);
1068                 if (result)
1069                         goto end;
1070         }
1071
1072         /*
1073          * Wakeup device management
1074          *-----------------------
1075          */
1076         if (device->flags.wake_capable) {
1077                 result = acpi_bus_get_wakeup_device_flags(device);
1078                 if (result)
1079                         goto end;
1080         }
1081
1082         /*
1083          * Performance Management
1084          * ----------------------
1085          */
1086         if (device->flags.performance_manageable) {
1087                 result = acpi_bus_get_perf_flags(device);
1088                 if (result)
1089                         goto end;
1090         }
1091
1092         if ((result = acpi_device_set_context(device, type)))
1093                 goto end;
1094
1095         acpi_device_get_debug_info(device, handle, type);
1096
1097         acpi_device_register(device, parent);
1098
1099         /*
1100          * Bind _ADR-Based Devices
1101          * -----------------------
1102          * If there's a a bus address (_ADR) then we utilize the parent's 
1103          * 'bind' function (if exists) to bind the ACPI- and natively-
1104          * enumerated device representations.
1105          */
1106         if (device->flags.bus_address) {
1107                 if (device->parent && device->parent->ops.bind)
1108                         device->parent->ops.bind(device);
1109         }
1110
1111         /*
1112          * Locate & Attach Driver
1113          * ----------------------
1114          * If there's a hardware id (_HID) or compatible ids (_CID) we check
1115          * to see if there's a driver installed for this kind of device.  Note
1116          * that drivers can install before or after a device is enumerated.
1117          *
1118          * TBD: Assumes LDM provides driver hot-plug capability.
1119          */
1120         acpi_bus_find_driver(device);
1121
1122       end:
1123         if (!result)
1124                 *child = device;
1125         else {
1126                 kfree(device->pnp.cid_list);
1127                 kfree(device);
1128         }
1129
1130         return_VALUE(result);
1131 }
1132
1133 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1134 {
1135         acpi_status status = AE_OK;
1136         struct acpi_device *parent = NULL;
1137         struct acpi_device *child = NULL;
1138         acpi_handle phandle = NULL;
1139         acpi_handle chandle = NULL;
1140         acpi_object_type type = 0;
1141         u32 level = 1;
1142
1143         ACPI_FUNCTION_TRACE("acpi_bus_scan");
1144
1145         if (!start)
1146                 return_VALUE(-EINVAL);
1147
1148         parent = start;
1149         phandle = start->handle;
1150
1151         /*
1152          * Parse through the ACPI namespace, identify all 'devices', and
1153          * create a new 'struct acpi_device' for each.
1154          */
1155         while ((level > 0) && parent) {
1156
1157                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1158                                               chandle, &chandle);
1159
1160                 /*
1161                  * If this scope is exhausted then move our way back up.
1162                  */
1163                 if (ACPI_FAILURE(status)) {
1164                         level--;
1165                         chandle = phandle;
1166                         acpi_get_parent(phandle, &phandle);
1167                         if (parent->parent)
1168                                 parent = parent->parent;
1169                         continue;
1170                 }
1171
1172                 status = acpi_get_type(chandle, &type);
1173                 if (ACPI_FAILURE(status))
1174                         continue;
1175
1176                 /*
1177                  * If this is a scope object then parse it (depth-first).
1178                  */
1179                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1180                         level++;
1181                         phandle = chandle;
1182                         chandle = NULL;
1183                         continue;
1184                 }
1185
1186                 /*
1187                  * We're only interested in objects that we consider 'devices'.
1188                  */
1189                 switch (type) {
1190                 case ACPI_TYPE_DEVICE:
1191                         type = ACPI_BUS_TYPE_DEVICE;
1192                         break;
1193                 case ACPI_TYPE_PROCESSOR:
1194                         type = ACPI_BUS_TYPE_PROCESSOR;
1195                         break;
1196                 case ACPI_TYPE_THERMAL:
1197                         type = ACPI_BUS_TYPE_THERMAL;
1198                         break;
1199                 case ACPI_TYPE_POWER:
1200                         type = ACPI_BUS_TYPE_POWER;
1201                         break;
1202                 default:
1203                         continue;
1204                 }
1205
1206                 if (ops->acpi_op_add)
1207                         status = acpi_add_single_object(&child, parent,
1208                                                         chandle, type);
1209                 else
1210                         status = acpi_bus_get_device(chandle, &child);
1211
1212                 if (ACPI_FAILURE(status))
1213                         continue;
1214
1215                 if (ops->acpi_op_start) {
1216                         status = acpi_start_single_object(child);
1217                         if (ACPI_FAILURE(status))
1218                                 continue;
1219                 }
1220
1221                 /*
1222                  * If the device is present, enabled, and functioning then
1223                  * parse its scope (depth-first).  Note that we need to
1224                  * represent absent devices to facilitate PnP notifications
1225                  * -- but only the subtree head (not all of its children,
1226                  * which will be enumerated when the parent is inserted).
1227                  *
1228                  * TBD: Need notifications and other detection mechanisms
1229                  *      in place before we can fully implement this.
1230                  */
1231                 if (child->status.present) {
1232                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1233                                                       NULL, NULL);
1234                         if (ACPI_SUCCESS(status)) {
1235                                 level++;
1236                                 phandle = chandle;
1237                                 chandle = NULL;
1238                                 parent = child;
1239                         }
1240                 }
1241         }
1242
1243         return_VALUE(0);
1244 }
1245
1246 int
1247 acpi_bus_add(struct acpi_device **child,
1248              struct acpi_device *parent, acpi_handle handle, int type)
1249 {
1250         int result;
1251         struct acpi_bus_ops ops;
1252
1253         ACPI_FUNCTION_TRACE("acpi_bus_add");
1254
1255         result = acpi_add_single_object(child, parent, handle, type);
1256         if (!result) {
1257                 memset(&ops, 0, sizeof(ops));
1258                 ops.acpi_op_add = 1;
1259                 result = acpi_bus_scan(*child, &ops);
1260         }
1261         return_VALUE(result);
1262 }
1263
1264 EXPORT_SYMBOL(acpi_bus_add);
1265
1266 int acpi_bus_start(struct acpi_device *device)
1267 {
1268         int result;
1269         struct acpi_bus_ops ops;
1270
1271         ACPI_FUNCTION_TRACE("acpi_bus_start");
1272
1273         if (!device)
1274                 return_VALUE(-EINVAL);
1275
1276         result = acpi_start_single_object(device);
1277         if (!result) {
1278                 memset(&ops, 0, sizeof(ops));
1279                 ops.acpi_op_start = 1;
1280                 result = acpi_bus_scan(device, &ops);
1281         }
1282         return_VALUE(result);
1283 }
1284
1285 EXPORT_SYMBOL(acpi_bus_start);
1286
1287 static int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1288 {
1289         acpi_status status;
1290         struct acpi_device *parent, *child;
1291         acpi_handle phandle, chandle;
1292         acpi_object_type type;
1293         u32 level = 1;
1294         int err = 0;
1295
1296         parent = start;
1297         phandle = start->handle;
1298         child = chandle = NULL;
1299
1300         while ((level > 0) && parent && (!err)) {
1301                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1302                                               chandle, &chandle);
1303
1304                 /*
1305                  * If this scope is exhausted then move our way back up.
1306                  */
1307                 if (ACPI_FAILURE(status)) {
1308                         level--;
1309                         chandle = phandle;
1310                         acpi_get_parent(phandle, &phandle);
1311                         child = parent;
1312                         parent = parent->parent;
1313
1314                         if (level == 0)
1315                                 err = acpi_bus_remove(child, rmdevice);
1316                         else
1317                                 err = acpi_bus_remove(child, 1);
1318
1319                         continue;
1320                 }
1321
1322                 status = acpi_get_type(chandle, &type);
1323                 if (ACPI_FAILURE(status)) {
1324                         continue;
1325                 }
1326                 /*
1327                  * If there is a device corresponding to chandle then
1328                  * parse it (depth-first).
1329                  */
1330                 if (acpi_bus_get_device(chandle, &child) == 0) {
1331                         level++;
1332                         phandle = chandle;
1333                         chandle = NULL;
1334                         parent = child;
1335                 }
1336                 continue;
1337         }
1338         return err;
1339 }
1340
1341 static int acpi_bus_scan_fixed(struct acpi_device *root)
1342 {
1343         int result = 0;
1344         struct acpi_device *device = NULL;
1345
1346         ACPI_FUNCTION_TRACE("acpi_bus_scan_fixed");
1347
1348         if (!root)
1349                 return_VALUE(-ENODEV);
1350
1351         /*
1352          * Enumerate all fixed-feature devices.
1353          */
1354         if (acpi_fadt.pwr_button == 0) {
1355                 result = acpi_add_single_object(&device, acpi_root,
1356                                                 NULL,
1357                                                 ACPI_BUS_TYPE_POWER_BUTTON);
1358                 if (!result)
1359                         result = acpi_start_single_object(device);
1360         }
1361
1362         if (acpi_fadt.sleep_button == 0) {
1363                 result = acpi_add_single_object(&device, acpi_root,
1364                                                 NULL,
1365                                                 ACPI_BUS_TYPE_SLEEP_BUTTON);
1366                 if (!result)
1367                         result = acpi_start_single_object(device);
1368         }
1369
1370         return_VALUE(result);
1371 }
1372
1373 static int __init acpi_scan_init(void)
1374 {
1375         int result;
1376         struct acpi_bus_ops ops;
1377
1378         ACPI_FUNCTION_TRACE("acpi_scan_init");
1379
1380         if (acpi_disabled)
1381                 return_VALUE(0);
1382
1383         kset_register(&acpi_namespace_kset);
1384
1385         /*
1386          * Create the root device in the bus's device tree
1387          */
1388         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1389                                         ACPI_BUS_TYPE_SYSTEM);
1390         if (result)
1391                 goto Done;
1392
1393         result = acpi_start_single_object(acpi_root);
1394
1395         /*
1396          * Enumerate devices in the ACPI namespace.
1397          */
1398         result = acpi_bus_scan_fixed(acpi_root);
1399         if (!result) {
1400                 memset(&ops, 0, sizeof(ops));
1401                 ops.acpi_op_add = 1;
1402                 ops.acpi_op_start = 1;
1403                 result = acpi_bus_scan(acpi_root, &ops);
1404         }
1405
1406         if (result)
1407                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1408
1409       Done:
1410         return_VALUE(result);
1411 }
1412
1413 subsys_initcall(acpi_scan_init);