Merge by hand (conflicts between pending drivers and kfree cleanups)
[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_hotplug(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_hotplug_env_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_hotplug_ops namespace_hotplug_ops = {
102         .hotplug = &namespace_hotplug,
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         .hotplug_ops = &namespace_hotplug_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 hotplug 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 
479  * --------------
480  * Checks the device's hardware (_HID) or compatible (_CID) ids to see if it
481  * matches the specified driver's criteria.
482  */
483 static int
484 acpi_bus_match(struct acpi_device *device, struct acpi_driver *driver)
485 {
486         if (driver && driver->ops.match)
487                 return driver->ops.match(device, driver);
488         return acpi_match_ids(device, driver->ids);
489 }
490
491 /**
492  * acpi_bus_driver_init 
493  * --------------------
494  * Used to initialize a device via its device driver.  Called whenever a 
495  * driver is bound to a device.  Invokes the driver's add() and start() ops.
496  */
497 static int
498 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
499 {
500         int result = 0;
501
502         ACPI_FUNCTION_TRACE("acpi_bus_driver_init");
503
504         if (!device || !driver)
505                 return_VALUE(-EINVAL);
506
507         if (!driver->ops.add)
508                 return_VALUE(-ENOSYS);
509
510         result = driver->ops.add(device);
511         if (result) {
512                 device->driver = NULL;
513                 acpi_driver_data(device) = NULL;
514                 return_VALUE(result);
515         }
516
517         device->driver = driver;
518
519         /*
520          * TBD - Configuration Management: Assign resources to device based
521          * upon possible configuration and currently allocated resources.
522          */
523
524         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
525                           "Driver successfully bound to device\n"));
526         return_VALUE(0);
527 }
528
529 static int acpi_start_single_object(struct acpi_device *device)
530 {
531         int result = 0;
532         struct acpi_driver *driver;
533
534         ACPI_FUNCTION_TRACE("acpi_start_single_object");
535
536         if (!(driver = device->driver))
537                 return_VALUE(0);
538
539         if (driver->ops.start) {
540                 result = driver->ops.start(device);
541                 if (result && driver->ops.remove)
542                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
543         }
544
545         return_VALUE(result);
546 }
547
548 static int acpi_driver_attach(struct acpi_driver *drv)
549 {
550         struct list_head *node, *next;
551         int count = 0;
552
553         ACPI_FUNCTION_TRACE("acpi_driver_attach");
554
555         spin_lock(&acpi_device_lock);
556         list_for_each_safe(node, next, &acpi_device_list) {
557                 struct acpi_device *dev =
558                     container_of(node, struct acpi_device, g_list);
559
560                 if (dev->driver || !dev->status.present)
561                         continue;
562                 spin_unlock(&acpi_device_lock);
563
564                 if (!acpi_bus_match(dev, drv)) {
565                         if (!acpi_bus_driver_init(dev, drv)) {
566                                 acpi_start_single_object(dev);
567                                 atomic_inc(&drv->references);
568                                 count++;
569                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
570                                                   "Found driver [%s] for device [%s]\n",
571                                                   drv->name, dev->pnp.bus_id));
572                         }
573                 }
574                 spin_lock(&acpi_device_lock);
575         }
576         spin_unlock(&acpi_device_lock);
577         return_VALUE(count);
578 }
579
580 static int acpi_driver_detach(struct acpi_driver *drv)
581 {
582         struct list_head *node, *next;
583
584         ACPI_FUNCTION_TRACE("acpi_driver_detach");
585
586         spin_lock(&acpi_device_lock);
587         list_for_each_safe(node, next, &acpi_device_list) {
588                 struct acpi_device *dev =
589                     container_of(node, struct acpi_device, g_list);
590
591                 if (dev->driver == drv) {
592                         spin_unlock(&acpi_device_lock);
593                         if (drv->ops.remove)
594                                 drv->ops.remove(dev, ACPI_BUS_REMOVAL_NORMAL);
595                         spin_lock(&acpi_device_lock);
596                         dev->driver = NULL;
597                         dev->driver_data = NULL;
598                         atomic_dec(&drv->references);
599                 }
600         }
601         spin_unlock(&acpi_device_lock);
602         return_VALUE(0);
603 }
604
605 /**
606  * acpi_bus_register_driver 
607  * ------------------------ 
608  * Registers a driver with the ACPI bus.  Searches the namespace for all
609  * devices that match the driver's criteria and binds.  Returns the
610  * number of devices that were claimed by the driver, or a negative
611  * error status for failure.
612  */
613 int acpi_bus_register_driver(struct acpi_driver *driver)
614 {
615         int count;
616
617         ACPI_FUNCTION_TRACE("acpi_bus_register_driver");
618
619         if (acpi_disabled)
620                 return_VALUE(-ENODEV);
621
622         if (!driver)
623                 return_VALUE(-EINVAL);
624
625         spin_lock(&acpi_device_lock);
626         list_add_tail(&driver->node, &acpi_bus_drivers);
627         spin_unlock(&acpi_device_lock);
628         count = acpi_driver_attach(driver);
629
630         return_VALUE(count);
631 }
632
633 EXPORT_SYMBOL(acpi_bus_register_driver);
634
635 /**
636  * acpi_bus_unregister_driver 
637  * --------------------------
638  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
639  * devices that match the driver's criteria and unbinds.
640  */
641 int acpi_bus_unregister_driver(struct acpi_driver *driver)
642 {
643         int error = 0;
644
645         ACPI_FUNCTION_TRACE("acpi_bus_unregister_driver");
646
647         if (driver) {
648                 acpi_driver_detach(driver);
649
650                 if (!atomic_read(&driver->references)) {
651                         spin_lock(&acpi_device_lock);
652                         list_del_init(&driver->node);
653                         spin_unlock(&acpi_device_lock);
654                 }
655         } else
656                 error = -EINVAL;
657         return_VALUE(error);
658 }
659
660 EXPORT_SYMBOL(acpi_bus_unregister_driver);
661
662 /**
663  * acpi_bus_find_driver 
664  * --------------------
665  * Parses the list of registered drivers looking for a driver applicable for
666  * the specified device.
667  */
668 static int acpi_bus_find_driver(struct acpi_device *device)
669 {
670         int result = 0;
671         struct list_head *node, *next;
672
673         ACPI_FUNCTION_TRACE("acpi_bus_find_driver");
674
675         spin_lock(&acpi_device_lock);
676         list_for_each_safe(node, next, &acpi_bus_drivers) {
677                 struct acpi_driver *driver =
678                     container_of(node, struct acpi_driver, node);
679
680                 atomic_inc(&driver->references);
681                 spin_unlock(&acpi_device_lock);
682                 if (!acpi_bus_match(device, driver)) {
683                         result = acpi_bus_driver_init(device, driver);
684                         if (!result)
685                                 goto Done;
686                 }
687                 atomic_dec(&driver->references);
688                 spin_lock(&acpi_device_lock);
689         }
690         spin_unlock(&acpi_device_lock);
691
692       Done:
693         return_VALUE(result);
694 }
695
696 /* --------------------------------------------------------------------------
697                                  Device Enumeration
698    -------------------------------------------------------------------------- */
699
700 static int acpi_bus_get_flags(struct acpi_device *device)
701 {
702         acpi_status status = AE_OK;
703         acpi_handle temp = NULL;
704
705         ACPI_FUNCTION_TRACE("acpi_bus_get_flags");
706
707         /* Presence of _STA indicates 'dynamic_status' */
708         status = acpi_get_handle(device->handle, "_STA", &temp);
709         if (ACPI_SUCCESS(status))
710                 device->flags.dynamic_status = 1;
711
712         /* Presence of _CID indicates 'compatible_ids' */
713         status = acpi_get_handle(device->handle, "_CID", &temp);
714         if (ACPI_SUCCESS(status))
715                 device->flags.compatible_ids = 1;
716
717         /* Presence of _RMV indicates 'removable' */
718         status = acpi_get_handle(device->handle, "_RMV", &temp);
719         if (ACPI_SUCCESS(status))
720                 device->flags.removable = 1;
721
722         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
723         status = acpi_get_handle(device->handle, "_EJD", &temp);
724         if (ACPI_SUCCESS(status))
725                 device->flags.ejectable = 1;
726         else {
727                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
728                 if (ACPI_SUCCESS(status))
729                         device->flags.ejectable = 1;
730         }
731
732         /* Presence of _LCK indicates 'lockable' */
733         status = acpi_get_handle(device->handle, "_LCK", &temp);
734         if (ACPI_SUCCESS(status))
735                 device->flags.lockable = 1;
736
737         /* Presence of _PS0|_PR0 indicates 'power manageable' */
738         status = acpi_get_handle(device->handle, "_PS0", &temp);
739         if (ACPI_FAILURE(status))
740                 status = acpi_get_handle(device->handle, "_PR0", &temp);
741         if (ACPI_SUCCESS(status))
742                 device->flags.power_manageable = 1;
743
744         /* Presence of _PRW indicates wake capable */
745         status = acpi_get_handle(device->handle, "_PRW", &temp);
746         if (ACPI_SUCCESS(status))
747                 device->flags.wake_capable = 1;
748
749         /* TBD: Peformance management */
750
751         return_VALUE(0);
752 }
753
754 static void acpi_device_get_busid(struct acpi_device *device,
755                                   acpi_handle handle, int type)
756 {
757         char bus_id[5] = { '?', 0 };
758         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
759         int i = 0;
760
761         /*
762          * Bus ID
763          * ------
764          * The device's Bus ID is simply the object name.
765          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
766          */
767         switch (type) {
768         case ACPI_BUS_TYPE_SYSTEM:
769                 strcpy(device->pnp.bus_id, "ACPI");
770                 break;
771         case ACPI_BUS_TYPE_POWER_BUTTON:
772                 strcpy(device->pnp.bus_id, "PWRF");
773                 break;
774         case ACPI_BUS_TYPE_SLEEP_BUTTON:
775                 strcpy(device->pnp.bus_id, "SLPF");
776                 break;
777         default:
778                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
779                 /* Clean up trailing underscores (if any) */
780                 for (i = 3; i > 1; i--) {
781                         if (bus_id[i] == '_')
782                                 bus_id[i] = '\0';
783                         else
784                                 break;
785                 }
786                 strcpy(device->pnp.bus_id, bus_id);
787                 break;
788         }
789 }
790
791 static void acpi_device_set_id(struct acpi_device *device,
792                                struct acpi_device *parent, acpi_handle handle,
793                                int type)
794 {
795         struct acpi_device_info *info;
796         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
797         char *hid = NULL;
798         char *uid = NULL;
799         struct acpi_compatible_id_list *cid_list = NULL;
800         acpi_status status;
801
802         switch (type) {
803         case ACPI_BUS_TYPE_DEVICE:
804                 status = acpi_get_object_info(handle, &buffer);
805                 if (ACPI_FAILURE(status)) {
806                         printk("%s: Error reading device info\n", __FUNCTION__);
807                         return;
808                 }
809
810                 info = buffer.pointer;
811                 if (info->valid & ACPI_VALID_HID)
812                         hid = info->hardware_id.value;
813                 if (info->valid & ACPI_VALID_UID)
814                         uid = info->unique_id.value;
815                 if (info->valid & ACPI_VALID_CID)
816                         cid_list = &info->compatibility_id;
817                 if (info->valid & ACPI_VALID_ADR) {
818                         device->pnp.bus_address = info->address;
819                         device->flags.bus_address = 1;
820                 }
821                 break;
822         case ACPI_BUS_TYPE_POWER:
823                 hid = ACPI_POWER_HID;
824                 break;
825         case ACPI_BUS_TYPE_PROCESSOR:
826                 hid = ACPI_PROCESSOR_HID;
827                 break;
828         case ACPI_BUS_TYPE_SYSTEM:
829                 hid = ACPI_SYSTEM_HID;
830                 break;
831         case ACPI_BUS_TYPE_THERMAL:
832                 hid = ACPI_THERMAL_HID;
833                 break;
834         case ACPI_BUS_TYPE_POWER_BUTTON:
835                 hid = ACPI_BUTTON_HID_POWERF;
836                 break;
837         case ACPI_BUS_TYPE_SLEEP_BUTTON:
838                 hid = ACPI_BUTTON_HID_SLEEPF;
839                 break;
840         }
841
842         /* 
843          * \_SB
844          * ----
845          * Fix for the system root bus device -- the only root-level device.
846          */
847         if ((parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
848                 hid = ACPI_BUS_HID;
849                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
850                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
851         }
852
853         if (hid) {
854                 strcpy(device->pnp.hardware_id, hid);
855                 device->flags.hardware_id = 1;
856         }
857         if (uid) {
858                 strcpy(device->pnp.unique_id, uid);
859                 device->flags.unique_id = 1;
860         }
861         if (cid_list) {
862                 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
863                 if (device->pnp.cid_list)
864                         memcpy(device->pnp.cid_list, cid_list, cid_list->size);
865                 else
866                         printk(KERN_ERR "Memory allocation error\n");
867         }
868
869         acpi_os_free(buffer.pointer);
870 }
871
872 static int acpi_device_set_context(struct acpi_device *device, int type)
873 {
874         acpi_status status = AE_OK;
875         int result = 0;
876         /*
877          * Context
878          * -------
879          * Attach this 'struct acpi_device' to the ACPI object.  This makes
880          * resolutions from handle->device very efficient.  Note that we need
881          * to be careful with fixed-feature devices as they all attach to the
882          * root object.
883          */
884         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
885             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
886                 status = acpi_attach_data(device->handle,
887                                           acpi_bus_data_handler, device);
888
889                 if (ACPI_FAILURE(status)) {
890                         printk("Error attaching device data\n");
891                         result = -ENODEV;
892                 }
893         }
894         return result;
895 }
896
897 static void acpi_device_get_debug_info(struct acpi_device *device,
898                                        acpi_handle handle, int type)
899 {
900 #ifdef CONFIG_ACPI_DEBUG_OUTPUT
901         char *type_string = NULL;
902         char name[80] = { '?', '\0' };
903         struct acpi_buffer buffer = { sizeof(name), name };
904
905         switch (type) {
906         case ACPI_BUS_TYPE_DEVICE:
907                 type_string = "Device";
908                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
909                 break;
910         case ACPI_BUS_TYPE_POWER:
911                 type_string = "Power Resource";
912                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
913                 break;
914         case ACPI_BUS_TYPE_PROCESSOR:
915                 type_string = "Processor";
916                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
917                 break;
918         case ACPI_BUS_TYPE_SYSTEM:
919                 type_string = "System";
920                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
921                 break;
922         case ACPI_BUS_TYPE_THERMAL:
923                 type_string = "Thermal Zone";
924                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
925                 break;
926         case ACPI_BUS_TYPE_POWER_BUTTON:
927                 type_string = "Power Button";
928                 sprintf(name, "PWRB");
929                 break;
930         case ACPI_BUS_TYPE_SLEEP_BUTTON:
931                 type_string = "Sleep Button";
932                 sprintf(name, "SLPB");
933                 break;
934         }
935
936         printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle);
937 #endif                          /*CONFIG_ACPI_DEBUG_OUTPUT */
938 }
939
940 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
941 {
942         int result = 0;
943         struct acpi_driver *driver;
944
945         ACPI_FUNCTION_TRACE("acpi_bus_remove");
946
947         if (!dev)
948                 return_VALUE(-EINVAL);
949
950         driver = dev->driver;
951
952         if ((driver) && (driver->ops.remove)) {
953
954                 if (driver->ops.stop) {
955                         result = driver->ops.stop(dev, ACPI_BUS_REMOVAL_EJECT);
956                         if (result)
957                                 return_VALUE(result);
958                 }
959
960                 result = dev->driver->ops.remove(dev, ACPI_BUS_REMOVAL_EJECT);
961                 if (result) {
962                         return_VALUE(result);
963                 }
964
965                 atomic_dec(&dev->driver->references);
966                 dev->driver = NULL;
967                 acpi_driver_data(dev) = NULL;
968         }
969
970         if (!rmdevice)
971                 return_VALUE(0);
972
973         if (dev->flags.bus_address) {
974                 if ((dev->parent) && (dev->parent->ops.unbind))
975                         dev->parent->ops.unbind(dev);
976         }
977
978         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
979
980         return_VALUE(0);
981 }
982
983 static int
984 acpi_add_single_object(struct acpi_device **child,
985                        struct acpi_device *parent, acpi_handle handle, int type)
986 {
987         int result = 0;
988         struct acpi_device *device = NULL;
989
990         ACPI_FUNCTION_TRACE("acpi_add_single_object");
991
992         if (!child)
993                 return_VALUE(-EINVAL);
994
995         device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
996         if (!device) {
997                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n"));
998                 return_VALUE(-ENOMEM);
999         }
1000         memset(device, 0, sizeof(struct acpi_device));
1001
1002         device->handle = handle;
1003         device->parent = parent;
1004
1005         acpi_device_get_busid(device, handle, type);
1006
1007         /*
1008          * Flags
1009          * -----
1010          * Get prior to calling acpi_bus_get_status() so we know whether
1011          * or not _STA is present.  Note that we only look for object
1012          * handles -- cannot evaluate objects until we know the device is
1013          * present and properly initialized.
1014          */
1015         result = acpi_bus_get_flags(device);
1016         if (result)
1017                 goto end;
1018
1019         /*
1020          * Status
1021          * ------
1022          * See if the device is present.  We always assume that non-Device
1023          * and non-Processor objects (e.g. thermal zones, power resources,
1024          * etc.) are present, functioning, etc. (at least when parent object
1025          * is present).  Note that _STA has a different meaning for some
1026          * objects (e.g. power resources) so we need to be careful how we use
1027          * it.
1028          */
1029         switch (type) {
1030         case ACPI_BUS_TYPE_PROCESSOR:
1031         case ACPI_BUS_TYPE_DEVICE:
1032                 result = acpi_bus_get_status(device);
1033                 if (ACPI_FAILURE(result) || !device->status.present) {
1034                         result = -ENOENT;
1035                         goto end;
1036                 }
1037                 break;
1038         default:
1039                 STRUCT_TO_INT(device->status) = 0x0F;
1040                 break;
1041         }
1042
1043         /*
1044          * Initialize Device
1045          * -----------------
1046          * TBD: Synch with Core's enumeration/initialization process.
1047          */
1048
1049         /*
1050          * Hardware ID, Unique ID, & Bus Address
1051          * -------------------------------------
1052          */
1053         acpi_device_set_id(device, parent, handle, type);
1054
1055         /*
1056          * Power Management
1057          * ----------------
1058          */
1059         if (device->flags.power_manageable) {
1060                 result = acpi_bus_get_power_flags(device);
1061                 if (result)
1062                         goto end;
1063         }
1064
1065         /*
1066          * Wakeup device management
1067          *-----------------------
1068          */
1069         if (device->flags.wake_capable) {
1070                 result = acpi_bus_get_wakeup_device_flags(device);
1071                 if (result)
1072                         goto end;
1073         }
1074
1075         /*
1076          * Performance Management
1077          * ----------------------
1078          */
1079         if (device->flags.performance_manageable) {
1080                 result = acpi_bus_get_perf_flags(device);
1081                 if (result)
1082                         goto end;
1083         }
1084
1085         if ((result = acpi_device_set_context(device, type)))
1086                 goto end;
1087
1088         acpi_device_get_debug_info(device, handle, type);
1089
1090         acpi_device_register(device, parent);
1091
1092         /*
1093          * Bind _ADR-Based Devices
1094          * -----------------------
1095          * If there's a a bus address (_ADR) then we utilize the parent's 
1096          * 'bind' function (if exists) to bind the ACPI- and natively-
1097          * enumerated device representations.
1098          */
1099         if (device->flags.bus_address) {
1100                 if (device->parent && device->parent->ops.bind)
1101                         device->parent->ops.bind(device);
1102         }
1103
1104         /*
1105          * Locate & Attach Driver
1106          * ----------------------
1107          * If there's a hardware id (_HID) or compatible ids (_CID) we check
1108          * to see if there's a driver installed for this kind of device.  Note
1109          * that drivers can install before or after a device is enumerated.
1110          *
1111          * TBD: Assumes LDM provides driver hot-plug capability.
1112          */
1113         result = acpi_bus_find_driver(device);
1114
1115       end:
1116         if (!result)
1117                 *child = device;
1118         else {
1119                 kfree(device->pnp.cid_list);
1120                 kfree(device);
1121         }
1122
1123         return_VALUE(result);
1124 }
1125
1126 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1127 {
1128         acpi_status status = AE_OK;
1129         struct acpi_device *parent = NULL;
1130         struct acpi_device *child = NULL;
1131         acpi_handle phandle = NULL;
1132         acpi_handle chandle = NULL;
1133         acpi_object_type type = 0;
1134         u32 level = 1;
1135
1136         ACPI_FUNCTION_TRACE("acpi_bus_scan");
1137
1138         if (!start)
1139                 return_VALUE(-EINVAL);
1140
1141         parent = start;
1142         phandle = start->handle;
1143
1144         /*
1145          * Parse through the ACPI namespace, identify all 'devices', and
1146          * create a new 'struct acpi_device' for each.
1147          */
1148         while ((level > 0) && parent) {
1149
1150                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1151                                               chandle, &chandle);
1152
1153                 /*
1154                  * If this scope is exhausted then move our way back up.
1155                  */
1156                 if (ACPI_FAILURE(status)) {
1157                         level--;
1158                         chandle = phandle;
1159                         acpi_get_parent(phandle, &phandle);
1160                         if (parent->parent)
1161                                 parent = parent->parent;
1162                         continue;
1163                 }
1164
1165                 status = acpi_get_type(chandle, &type);
1166                 if (ACPI_FAILURE(status))
1167                         continue;
1168
1169                 /*
1170                  * If this is a scope object then parse it (depth-first).
1171                  */
1172                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1173                         level++;
1174                         phandle = chandle;
1175                         chandle = NULL;
1176                         continue;
1177                 }
1178
1179                 /*
1180                  * We're only interested in objects that we consider 'devices'.
1181                  */
1182                 switch (type) {
1183                 case ACPI_TYPE_DEVICE:
1184                         type = ACPI_BUS_TYPE_DEVICE;
1185                         break;
1186                 case ACPI_TYPE_PROCESSOR:
1187                         type = ACPI_BUS_TYPE_PROCESSOR;
1188                         break;
1189                 case ACPI_TYPE_THERMAL:
1190                         type = ACPI_BUS_TYPE_THERMAL;
1191                         break;
1192                 case ACPI_TYPE_POWER:
1193                         type = ACPI_BUS_TYPE_POWER;
1194                         break;
1195                 default:
1196                         continue;
1197                 }
1198
1199                 if (ops->acpi_op_add)
1200                         status = acpi_add_single_object(&child, parent,
1201                                                         chandle, type);
1202                 else
1203                         status = acpi_bus_get_device(chandle, &child);
1204
1205                 if (ACPI_FAILURE(status))
1206                         continue;
1207
1208                 if (ops->acpi_op_start) {
1209                         status = acpi_start_single_object(child);
1210                         if (ACPI_FAILURE(status))
1211                                 continue;
1212                 }
1213
1214                 /*
1215                  * If the device is present, enabled, and functioning then
1216                  * parse its scope (depth-first).  Note that we need to
1217                  * represent absent devices to facilitate PnP notifications
1218                  * -- but only the subtree head (not all of its children,
1219                  * which will be enumerated when the parent is inserted).
1220                  *
1221                  * TBD: Need notifications and other detection mechanisms
1222                  *      in place before we can fully implement this.
1223                  */
1224                 if (child->status.present) {
1225                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1226                                                       NULL, NULL);
1227                         if (ACPI_SUCCESS(status)) {
1228                                 level++;
1229                                 phandle = chandle;
1230                                 chandle = NULL;
1231                                 parent = child;
1232                         }
1233                 }
1234         }
1235
1236         return_VALUE(0);
1237 }
1238
1239 int
1240 acpi_bus_add(struct acpi_device **child,
1241              struct acpi_device *parent, acpi_handle handle, int type)
1242 {
1243         int result;
1244         struct acpi_bus_ops ops;
1245
1246         ACPI_FUNCTION_TRACE("acpi_bus_add");
1247
1248         result = acpi_add_single_object(child, parent, handle, type);
1249         if (!result) {
1250                 memset(&ops, 0, sizeof(ops));
1251                 ops.acpi_op_add = 1;
1252                 result = acpi_bus_scan(*child, &ops);
1253         }
1254         return_VALUE(result);
1255 }
1256
1257 EXPORT_SYMBOL(acpi_bus_add);
1258
1259 int acpi_bus_start(struct acpi_device *device)
1260 {
1261         int result;
1262         struct acpi_bus_ops ops;
1263
1264         ACPI_FUNCTION_TRACE("acpi_bus_start");
1265
1266         if (!device)
1267                 return_VALUE(-EINVAL);
1268
1269         result = acpi_start_single_object(device);
1270         if (!result) {
1271                 memset(&ops, 0, sizeof(ops));
1272                 ops.acpi_op_start = 1;
1273                 result = acpi_bus_scan(device, &ops);
1274         }
1275         return_VALUE(result);
1276 }
1277
1278 EXPORT_SYMBOL(acpi_bus_start);
1279
1280 static int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1281 {
1282         acpi_status status;
1283         struct acpi_device *parent, *child;
1284         acpi_handle phandle, chandle;
1285         acpi_object_type type;
1286         u32 level = 1;
1287         int err = 0;
1288
1289         parent = start;
1290         phandle = start->handle;
1291         child = chandle = NULL;
1292
1293         while ((level > 0) && parent && (!err)) {
1294                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1295                                               chandle, &chandle);
1296
1297                 /*
1298                  * If this scope is exhausted then move our way back up.
1299                  */
1300                 if (ACPI_FAILURE(status)) {
1301                         level--;
1302                         chandle = phandle;
1303                         acpi_get_parent(phandle, &phandle);
1304                         child = parent;
1305                         parent = parent->parent;
1306
1307                         if (level == 0)
1308                                 err = acpi_bus_remove(child, rmdevice);
1309                         else
1310                                 err = acpi_bus_remove(child, 1);
1311
1312                         continue;
1313                 }
1314
1315                 status = acpi_get_type(chandle, &type);
1316                 if (ACPI_FAILURE(status)) {
1317                         continue;
1318                 }
1319                 /*
1320                  * If there is a device corresponding to chandle then
1321                  * parse it (depth-first).
1322                  */
1323                 if (acpi_bus_get_device(chandle, &child) == 0) {
1324                         level++;
1325                         phandle = chandle;
1326                         chandle = NULL;
1327                         parent = child;
1328                 }
1329                 continue;
1330         }
1331         return err;
1332 }
1333
1334 static int acpi_bus_scan_fixed(struct acpi_device *root)
1335 {
1336         int result = 0;
1337         struct acpi_device *device = NULL;
1338
1339         ACPI_FUNCTION_TRACE("acpi_bus_scan_fixed");
1340
1341         if (!root)
1342                 return_VALUE(-ENODEV);
1343
1344         /*
1345          * Enumerate all fixed-feature devices.
1346          */
1347         if (acpi_fadt.pwr_button == 0) {
1348                 result = acpi_add_single_object(&device, acpi_root,
1349                                                 NULL,
1350                                                 ACPI_BUS_TYPE_POWER_BUTTON);
1351                 if (!result)
1352                         result = acpi_start_single_object(device);
1353         }
1354
1355         if (acpi_fadt.sleep_button == 0) {
1356                 result = acpi_add_single_object(&device, acpi_root,
1357                                                 NULL,
1358                                                 ACPI_BUS_TYPE_SLEEP_BUTTON);
1359                 if (!result)
1360                         result = acpi_start_single_object(device);
1361         }
1362
1363         return_VALUE(result);
1364 }
1365
1366 static int __init acpi_scan_init(void)
1367 {
1368         int result;
1369         struct acpi_bus_ops ops;
1370
1371         ACPI_FUNCTION_TRACE("acpi_scan_init");
1372
1373         if (acpi_disabled)
1374                 return_VALUE(0);
1375
1376         kset_register(&acpi_namespace_kset);
1377
1378         /*
1379          * Create the root device in the bus's device tree
1380          */
1381         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1382                                         ACPI_BUS_TYPE_SYSTEM);
1383         if (result)
1384                 goto Done;
1385
1386         result = acpi_start_single_object(acpi_root);
1387
1388         /*
1389          * Enumerate devices in the ACPI namespace.
1390          */
1391         result = acpi_bus_scan_fixed(acpi_root);
1392         if (!result) {
1393                 memset(&ops, 0, sizeof(ops));
1394                 ops.acpi_op_add = 1;
1395                 ops.acpi_op_start = 1;
1396                 result = acpi_bus_scan(acpi_root, &ops);
1397         }
1398
1399         if (result)
1400                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1401
1402       Done:
1403         return_VALUE(result);
1404 }
1405
1406 subsys_initcall(acpi_scan_init);