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