Pull address_range 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         if (type == ACPI_TYPE_PROCESSOR)
445                 result = acpi_bus_trim(device, 0);
446         else
447                 result = acpi_bus_trim(device, 1);
448
449         if (!result)
450                 result = acpi_eject_operation(handle, islockable);
451
452         if (result) {
453                 ret = -EBUSY;
454         }
455       err:
456         return ret;
457 }
458
459 /* --------------------------------------------------------------------------
460                               Performance Management
461    -------------------------------------------------------------------------- */
462
463 static int acpi_bus_get_perf_flags(struct acpi_device *device)
464 {
465         device->performance.state = ACPI_STATE_UNKNOWN;
466         return 0;
467 }
468
469 /* --------------------------------------------------------------------------
470                                  Driver Management
471    -------------------------------------------------------------------------- */
472
473 static LIST_HEAD(acpi_bus_drivers);
474 static DECLARE_MUTEX(acpi_bus_drivers_lock);
475
476 /**
477  * acpi_bus_match - match device IDs to driver's supported IDs
478  * @device: the device that we are trying to match to a driver
479  * @driver: driver whose device id table is being checked
480  *
481  * Checks the device's hardware (_HID) or compatible (_CID) ids to see if it
482  * matches the specified driver's criteria.
483  */
484 static int
485 acpi_bus_match(struct acpi_device *device, struct acpi_driver *driver)
486 {
487         if (driver && driver->ops.match)
488                 return driver->ops.match(device, driver);
489         return acpi_match_ids(device, driver->ids);
490 }
491
492 /**
493  * acpi_bus_driver_init - add a device to a driver
494  * @device: the device to add and initialize
495  * @driver: driver for the device
496  *
497  * Used to initialize a device via its device driver.  Called whenever a 
498  * driver is bound to a device.  Invokes the driver's add() and start() ops.
499  */
500 static int
501 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
502 {
503         int result = 0;
504
505         ACPI_FUNCTION_TRACE("acpi_bus_driver_init");
506
507         if (!device || !driver)
508                 return_VALUE(-EINVAL);
509
510         if (!driver->ops.add)
511                 return_VALUE(-ENOSYS);
512
513         result = driver->ops.add(device);
514         if (result) {
515                 device->driver = NULL;
516                 acpi_driver_data(device) = NULL;
517                 return_VALUE(result);
518         }
519
520         device->driver = driver;
521
522         /*
523          * TBD - Configuration Management: Assign resources to device based
524          * upon possible configuration and currently allocated resources.
525          */
526
527         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
528                           "Driver successfully bound to device\n"));
529         return_VALUE(0);
530 }
531
532 static int acpi_start_single_object(struct acpi_device *device)
533 {
534         int result = 0;
535         struct acpi_driver *driver;
536
537         ACPI_FUNCTION_TRACE("acpi_start_single_object");
538
539         if (!(driver = device->driver))
540                 return_VALUE(0);
541
542         if (driver->ops.start) {
543                 result = driver->ops.start(device);
544                 if (result && driver->ops.remove)
545                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
546         }
547
548         return_VALUE(result);
549 }
550
551 static int acpi_driver_attach(struct acpi_driver *drv)
552 {
553         struct list_head *node, *next;
554         int count = 0;
555
556         ACPI_FUNCTION_TRACE("acpi_driver_attach");
557
558         spin_lock(&acpi_device_lock);
559         list_for_each_safe(node, next, &acpi_device_list) {
560                 struct acpi_device *dev =
561                     container_of(node, struct acpi_device, g_list);
562
563                 if (dev->driver || !dev->status.present)
564                         continue;
565                 spin_unlock(&acpi_device_lock);
566
567                 if (!acpi_bus_match(dev, drv)) {
568                         if (!acpi_bus_driver_init(dev, drv)) {
569                                 acpi_start_single_object(dev);
570                                 atomic_inc(&drv->references);
571                                 count++;
572                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
573                                                   "Found driver [%s] for device [%s]\n",
574                                                   drv->name, dev->pnp.bus_id));
575                         }
576                 }
577                 spin_lock(&acpi_device_lock);
578         }
579         spin_unlock(&acpi_device_lock);
580         return_VALUE(count);
581 }
582
583 static int acpi_driver_detach(struct acpi_driver *drv)
584 {
585         struct list_head *node, *next;
586
587         ACPI_FUNCTION_TRACE("acpi_driver_detach");
588
589         spin_lock(&acpi_device_lock);
590         list_for_each_safe(node, next, &acpi_device_list) {
591                 struct acpi_device *dev =
592                     container_of(node, struct acpi_device, g_list);
593
594                 if (dev->driver == drv) {
595                         spin_unlock(&acpi_device_lock);
596                         if (drv->ops.remove)
597                                 drv->ops.remove(dev, ACPI_BUS_REMOVAL_NORMAL);
598                         spin_lock(&acpi_device_lock);
599                         dev->driver = NULL;
600                         dev->driver_data = NULL;
601                         atomic_dec(&drv->references);
602                 }
603         }
604         spin_unlock(&acpi_device_lock);
605         return_VALUE(0);
606 }
607
608 /**
609  * acpi_bus_register_driver - register a driver with the ACPI bus
610  * @driver: driver being registered
611  *
612  * Registers a driver with the ACPI bus.  Searches the namespace for all
613  * devices that match the driver's criteria and binds.  Returns the
614  * number of devices that were claimed by the driver, or a negative
615  * error status for failure.
616  */
617 int acpi_bus_register_driver(struct acpi_driver *driver)
618 {
619         int count;
620
621         ACPI_FUNCTION_TRACE("acpi_bus_register_driver");
622
623         if (acpi_disabled)
624                 return_VALUE(-ENODEV);
625
626         if (!driver)
627                 return_VALUE(-EINVAL);
628
629         spin_lock(&acpi_device_lock);
630         list_add_tail(&driver->node, &acpi_bus_drivers);
631         spin_unlock(&acpi_device_lock);
632         count = acpi_driver_attach(driver);
633
634         return_VALUE(count);
635 }
636
637 EXPORT_SYMBOL(acpi_bus_register_driver);
638
639 /**
640  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
641  * @driver: driver to unregister
642  *
643  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
644  * devices that match the driver's criteria and unbinds.
645  */
646 int acpi_bus_unregister_driver(struct acpi_driver *driver)
647 {
648         int error = 0;
649
650         ACPI_FUNCTION_TRACE("acpi_bus_unregister_driver");
651
652         if (driver) {
653                 acpi_driver_detach(driver);
654
655                 if (!atomic_read(&driver->references)) {
656                         spin_lock(&acpi_device_lock);
657                         list_del_init(&driver->node);
658                         spin_unlock(&acpi_device_lock);
659                 }
660         } else
661                 error = -EINVAL;
662         return_VALUE(error);
663 }
664
665 EXPORT_SYMBOL(acpi_bus_unregister_driver);
666
667 /**
668  * acpi_bus_find_driver - check if there is a driver installed for the device
669  * @device: device that we are trying to find a supporting driver for
670  *
671  * Parses the list of registered drivers looking for a driver applicable for
672  * the specified device.
673  */
674 static int acpi_bus_find_driver(struct acpi_device *device)
675 {
676         int result = 0;
677         struct list_head *node, *next;
678
679         ACPI_FUNCTION_TRACE("acpi_bus_find_driver");
680
681         spin_lock(&acpi_device_lock);
682         list_for_each_safe(node, next, &acpi_bus_drivers) {
683                 struct acpi_driver *driver =
684                     container_of(node, struct acpi_driver, node);
685
686                 atomic_inc(&driver->references);
687                 spin_unlock(&acpi_device_lock);
688                 if (!acpi_bus_match(device, driver)) {
689                         result = acpi_bus_driver_init(device, driver);
690                         if (!result)
691                                 goto Done;
692                 }
693                 atomic_dec(&driver->references);
694                 spin_lock(&acpi_device_lock);
695         }
696         spin_unlock(&acpi_device_lock);
697
698       Done:
699         return_VALUE(result);
700 }
701
702 /* --------------------------------------------------------------------------
703                                  Device Enumeration
704    -------------------------------------------------------------------------- */
705
706 static int acpi_bus_get_flags(struct acpi_device *device)
707 {
708         acpi_status status = AE_OK;
709         acpi_handle temp = NULL;
710
711         ACPI_FUNCTION_TRACE("acpi_bus_get_flags");
712
713         /* Presence of _STA indicates 'dynamic_status' */
714         status = acpi_get_handle(device->handle, "_STA", &temp);
715         if (ACPI_SUCCESS(status))
716                 device->flags.dynamic_status = 1;
717
718         /* Presence of _CID indicates 'compatible_ids' */
719         status = acpi_get_handle(device->handle, "_CID", &temp);
720         if (ACPI_SUCCESS(status))
721                 device->flags.compatible_ids = 1;
722
723         /* Presence of _RMV indicates 'removable' */
724         status = acpi_get_handle(device->handle, "_RMV", &temp);
725         if (ACPI_SUCCESS(status))
726                 device->flags.removable = 1;
727
728         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
729         status = acpi_get_handle(device->handle, "_EJD", &temp);
730         if (ACPI_SUCCESS(status))
731                 device->flags.ejectable = 1;
732         else {
733                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
734                 if (ACPI_SUCCESS(status))
735                         device->flags.ejectable = 1;
736         }
737
738         /* Presence of _LCK indicates 'lockable' */
739         status = acpi_get_handle(device->handle, "_LCK", &temp);
740         if (ACPI_SUCCESS(status))
741                 device->flags.lockable = 1;
742
743         /* Presence of _PS0|_PR0 indicates 'power manageable' */
744         status = acpi_get_handle(device->handle, "_PS0", &temp);
745         if (ACPI_FAILURE(status))
746                 status = acpi_get_handle(device->handle, "_PR0", &temp);
747         if (ACPI_SUCCESS(status))
748                 device->flags.power_manageable = 1;
749
750         /* Presence of _PRW indicates wake capable */
751         status = acpi_get_handle(device->handle, "_PRW", &temp);
752         if (ACPI_SUCCESS(status))
753                 device->flags.wake_capable = 1;
754
755         /* TBD: Peformance management */
756
757         return_VALUE(0);
758 }
759
760 static void acpi_device_get_busid(struct acpi_device *device,
761                                   acpi_handle handle, int type)
762 {
763         char bus_id[5] = { '?', 0 };
764         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
765         int i = 0;
766
767         /*
768          * Bus ID
769          * ------
770          * The device's Bus ID is simply the object name.
771          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
772          */
773         switch (type) {
774         case ACPI_BUS_TYPE_SYSTEM:
775                 strcpy(device->pnp.bus_id, "ACPI");
776                 break;
777         case ACPI_BUS_TYPE_POWER_BUTTON:
778                 strcpy(device->pnp.bus_id, "PWRF");
779                 break;
780         case ACPI_BUS_TYPE_SLEEP_BUTTON:
781                 strcpy(device->pnp.bus_id, "SLPF");
782                 break;
783         default:
784                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
785                 /* Clean up trailing underscores (if any) */
786                 for (i = 3; i > 1; i--) {
787                         if (bus_id[i] == '_')
788                                 bus_id[i] = '\0';
789                         else
790                                 break;
791                 }
792                 strcpy(device->pnp.bus_id, bus_id);
793                 break;
794         }
795 }
796
797 static void acpi_device_set_id(struct acpi_device *device,
798                                struct acpi_device *parent, acpi_handle handle,
799                                int type)
800 {
801         struct acpi_device_info *info;
802         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
803         char *hid = NULL;
804         char *uid = NULL;
805         struct acpi_compatible_id_list *cid_list = NULL;
806         acpi_status status;
807
808         switch (type) {
809         case ACPI_BUS_TYPE_DEVICE:
810                 status = acpi_get_object_info(handle, &buffer);
811                 if (ACPI_FAILURE(status)) {
812                         printk("%s: Error reading device info\n", __FUNCTION__);
813                         return;
814                 }
815
816                 info = buffer.pointer;
817                 if (info->valid & ACPI_VALID_HID)
818                         hid = info->hardware_id.value;
819                 if (info->valid & ACPI_VALID_UID)
820                         uid = info->unique_id.value;
821                 if (info->valid & ACPI_VALID_CID)
822                         cid_list = &info->compatibility_id;
823                 if (info->valid & ACPI_VALID_ADR) {
824                         device->pnp.bus_address = info->address;
825                         device->flags.bus_address = 1;
826                 }
827                 break;
828         case ACPI_BUS_TYPE_POWER:
829                 hid = ACPI_POWER_HID;
830                 break;
831         case ACPI_BUS_TYPE_PROCESSOR:
832                 hid = ACPI_PROCESSOR_HID;
833                 break;
834         case ACPI_BUS_TYPE_SYSTEM:
835                 hid = ACPI_SYSTEM_HID;
836                 break;
837         case ACPI_BUS_TYPE_THERMAL:
838                 hid = ACPI_THERMAL_HID;
839                 break;
840         case ACPI_BUS_TYPE_POWER_BUTTON:
841                 hid = ACPI_BUTTON_HID_POWERF;
842                 break;
843         case ACPI_BUS_TYPE_SLEEP_BUTTON:
844                 hid = ACPI_BUTTON_HID_SLEEPF;
845                 break;
846         }
847
848         /* 
849          * \_SB
850          * ----
851          * Fix for the system root bus device -- the only root-level device.
852          */
853         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
854                 hid = ACPI_BUS_HID;
855                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
856                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
857         }
858
859         if (hid) {
860                 strcpy(device->pnp.hardware_id, hid);
861                 device->flags.hardware_id = 1;
862         }
863         if (uid) {
864                 strcpy(device->pnp.unique_id, uid);
865                 device->flags.unique_id = 1;
866         }
867         if (cid_list) {
868                 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
869                 if (device->pnp.cid_list)
870                         memcpy(device->pnp.cid_list, cid_list, cid_list->size);
871                 else
872                         printk(KERN_ERR "Memory allocation error\n");
873         }
874
875         acpi_os_free(buffer.pointer);
876 }
877
878 static int acpi_device_set_context(struct acpi_device *device, int type)
879 {
880         acpi_status status = AE_OK;
881         int result = 0;
882         /*
883          * Context
884          * -------
885          * Attach this 'struct acpi_device' to the ACPI object.  This makes
886          * resolutions from handle->device very efficient.  Note that we need
887          * to be careful with fixed-feature devices as they all attach to the
888          * root object.
889          */
890         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
891             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
892                 status = acpi_attach_data(device->handle,
893                                           acpi_bus_data_handler, device);
894
895                 if (ACPI_FAILURE(status)) {
896                         printk("Error attaching device data\n");
897                         result = -ENODEV;
898                 }
899         }
900         return result;
901 }
902
903 static void acpi_device_get_debug_info(struct acpi_device *device,
904                                        acpi_handle handle, int type)
905 {
906 #ifdef CONFIG_ACPI_DEBUG_OUTPUT
907         char *type_string = NULL;
908         char name[80] = { '?', '\0' };
909         struct acpi_buffer buffer = { sizeof(name), name };
910
911         switch (type) {
912         case ACPI_BUS_TYPE_DEVICE:
913                 type_string = "Device";
914                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
915                 break;
916         case ACPI_BUS_TYPE_POWER:
917                 type_string = "Power Resource";
918                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
919                 break;
920         case ACPI_BUS_TYPE_PROCESSOR:
921                 type_string = "Processor";
922                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
923                 break;
924         case ACPI_BUS_TYPE_SYSTEM:
925                 type_string = "System";
926                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
927                 break;
928         case ACPI_BUS_TYPE_THERMAL:
929                 type_string = "Thermal Zone";
930                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
931                 break;
932         case ACPI_BUS_TYPE_POWER_BUTTON:
933                 type_string = "Power Button";
934                 sprintf(name, "PWRB");
935                 break;
936         case ACPI_BUS_TYPE_SLEEP_BUTTON:
937                 type_string = "Sleep Button";
938                 sprintf(name, "SLPB");
939                 break;
940         }
941
942         printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle);
943 #endif                          /*CONFIG_ACPI_DEBUG_OUTPUT */
944 }
945
946 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
947 {
948         int result = 0;
949         struct acpi_driver *driver;
950
951         ACPI_FUNCTION_TRACE("acpi_bus_remove");
952
953         if (!dev)
954                 return_VALUE(-EINVAL);
955
956         driver = dev->driver;
957
958         if ((driver) && (driver->ops.remove)) {
959
960                 if (driver->ops.stop) {
961                         result = driver->ops.stop(dev, ACPI_BUS_REMOVAL_EJECT);
962                         if (result)
963                                 return_VALUE(result);
964                 }
965
966                 result = dev->driver->ops.remove(dev, ACPI_BUS_REMOVAL_EJECT);
967                 if (result) {
968                         return_VALUE(result);
969                 }
970
971                 atomic_dec(&dev->driver->references);
972                 dev->driver = NULL;
973                 acpi_driver_data(dev) = NULL;
974         }
975
976         if (!rmdevice)
977                 return_VALUE(0);
978
979         if (dev->flags.bus_address) {
980                 if ((dev->parent) && (dev->parent->ops.unbind))
981                         dev->parent->ops.unbind(dev);
982         }
983
984         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
985
986         return_VALUE(0);
987 }
988
989 static int
990 acpi_add_single_object(struct acpi_device **child,
991                        struct acpi_device *parent, acpi_handle handle, int type)
992 {
993         int result = 0;
994         struct acpi_device *device = NULL;
995
996         ACPI_FUNCTION_TRACE("acpi_add_single_object");
997
998         if (!child)
999                 return_VALUE(-EINVAL);
1000
1001         device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
1002         if (!device) {
1003                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n"));
1004                 return_VALUE(-ENOMEM);
1005         }
1006         memset(device, 0, sizeof(struct acpi_device));
1007
1008         device->handle = handle;
1009         device->parent = parent;
1010
1011         acpi_device_get_busid(device, handle, type);
1012
1013         /*
1014          * Flags
1015          * -----
1016          * Get prior to calling acpi_bus_get_status() so we know whether
1017          * or not _STA is present.  Note that we only look for object
1018          * handles -- cannot evaluate objects until we know the device is
1019          * present and properly initialized.
1020          */
1021         result = acpi_bus_get_flags(device);
1022         if (result)
1023                 goto end;
1024
1025         /*
1026          * Status
1027          * ------
1028          * See if the device is present.  We always assume that non-Device
1029          * and non-Processor objects (e.g. thermal zones, power resources,
1030          * etc.) are present, functioning, etc. (at least when parent object
1031          * is present).  Note that _STA has a different meaning for some
1032          * objects (e.g. power resources) so we need to be careful how we use
1033          * it.
1034          */
1035         switch (type) {
1036         case ACPI_BUS_TYPE_PROCESSOR:
1037         case ACPI_BUS_TYPE_DEVICE:
1038                 result = acpi_bus_get_status(device);
1039                 if (ACPI_FAILURE(result) || !device->status.present) {
1040                         result = -ENOENT;
1041                         goto end;
1042                 }
1043                 break;
1044         default:
1045                 STRUCT_TO_INT(device->status) = 0x0F;
1046                 break;
1047         }
1048
1049         /*
1050          * Initialize Device
1051          * -----------------
1052          * TBD: Synch with Core's enumeration/initialization process.
1053          */
1054
1055         /*
1056          * Hardware ID, Unique ID, & Bus Address
1057          * -------------------------------------
1058          */
1059         acpi_device_set_id(device, parent, handle, type);
1060
1061         /*
1062          * Power Management
1063          * ----------------
1064          */
1065         if (device->flags.power_manageable) {
1066                 result = acpi_bus_get_power_flags(device);
1067                 if (result)
1068                         goto end;
1069         }
1070
1071         /*
1072          * Wakeup device management
1073          *-----------------------
1074          */
1075         if (device->flags.wake_capable) {
1076                 result = acpi_bus_get_wakeup_device_flags(device);
1077                 if (result)
1078                         goto end;
1079         }
1080
1081         /*
1082          * Performance Management
1083          * ----------------------
1084          */
1085         if (device->flags.performance_manageable) {
1086                 result = acpi_bus_get_perf_flags(device);
1087                 if (result)
1088                         goto end;
1089         }
1090
1091         if ((result = acpi_device_set_context(device, type)))
1092                 goto end;
1093
1094         acpi_device_get_debug_info(device, handle, type);
1095
1096         acpi_device_register(device, parent);
1097
1098         /*
1099          * Bind _ADR-Based Devices
1100          * -----------------------
1101          * If there's a a bus address (_ADR) then we utilize the parent's 
1102          * 'bind' function (if exists) to bind the ACPI- and natively-
1103          * enumerated device representations.
1104          */
1105         if (device->flags.bus_address) {
1106                 if (device->parent && device->parent->ops.bind)
1107                         device->parent->ops.bind(device);
1108         }
1109
1110         /*
1111          * Locate & Attach Driver
1112          * ----------------------
1113          * If there's a hardware id (_HID) or compatible ids (_CID) we check
1114          * to see if there's a driver installed for this kind of device.  Note
1115          * that drivers can install before or after a device is enumerated.
1116          *
1117          * TBD: Assumes LDM provides driver hot-plug capability.
1118          */
1119         acpi_bus_find_driver(device);
1120
1121       end:
1122         if (!result)
1123                 *child = device;
1124         else {
1125                 kfree(device->pnp.cid_list);
1126                 kfree(device);
1127         }
1128
1129         return_VALUE(result);
1130 }
1131
1132 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1133 {
1134         acpi_status status = AE_OK;
1135         struct acpi_device *parent = NULL;
1136         struct acpi_device *child = NULL;
1137         acpi_handle phandle = NULL;
1138         acpi_handle chandle = NULL;
1139         acpi_object_type type = 0;
1140         u32 level = 1;
1141
1142         ACPI_FUNCTION_TRACE("acpi_bus_scan");
1143
1144         if (!start)
1145                 return_VALUE(-EINVAL);
1146
1147         parent = start;
1148         phandle = start->handle;
1149
1150         /*
1151          * Parse through the ACPI namespace, identify all 'devices', and
1152          * create a new 'struct acpi_device' for each.
1153          */
1154         while ((level > 0) && parent) {
1155
1156                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1157                                               chandle, &chandle);
1158
1159                 /*
1160                  * If this scope is exhausted then move our way back up.
1161                  */
1162                 if (ACPI_FAILURE(status)) {
1163                         level--;
1164                         chandle = phandle;
1165                         acpi_get_parent(phandle, &phandle);
1166                         if (parent->parent)
1167                                 parent = parent->parent;
1168                         continue;
1169                 }
1170
1171                 status = acpi_get_type(chandle, &type);
1172                 if (ACPI_FAILURE(status))
1173                         continue;
1174
1175                 /*
1176                  * If this is a scope object then parse it (depth-first).
1177                  */
1178                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1179                         level++;
1180                         phandle = chandle;
1181                         chandle = NULL;
1182                         continue;
1183                 }
1184
1185                 /*
1186                  * We're only interested in objects that we consider 'devices'.
1187                  */
1188                 switch (type) {
1189                 case ACPI_TYPE_DEVICE:
1190                         type = ACPI_BUS_TYPE_DEVICE;
1191                         break;
1192                 case ACPI_TYPE_PROCESSOR:
1193                         type = ACPI_BUS_TYPE_PROCESSOR;
1194                         break;
1195                 case ACPI_TYPE_THERMAL:
1196                         type = ACPI_BUS_TYPE_THERMAL;
1197                         break;
1198                 case ACPI_TYPE_POWER:
1199                         type = ACPI_BUS_TYPE_POWER;
1200                         break;
1201                 default:
1202                         continue;
1203                 }
1204
1205                 if (ops->acpi_op_add)
1206                         status = acpi_add_single_object(&child, parent,
1207                                                         chandle, type);
1208                 else
1209                         status = acpi_bus_get_device(chandle, &child);
1210
1211                 if (ACPI_FAILURE(status))
1212                         continue;
1213
1214                 if (ops->acpi_op_start) {
1215                         status = acpi_start_single_object(child);
1216                         if (ACPI_FAILURE(status))
1217                                 continue;
1218                 }
1219
1220                 /*
1221                  * If the device is present, enabled, and functioning then
1222                  * parse its scope (depth-first).  Note that we need to
1223                  * represent absent devices to facilitate PnP notifications
1224                  * -- but only the subtree head (not all of its children,
1225                  * which will be enumerated when the parent is inserted).
1226                  *
1227                  * TBD: Need notifications and other detection mechanisms
1228                  *      in place before we can fully implement this.
1229                  */
1230                 if (child->status.present) {
1231                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1232                                                       NULL, NULL);
1233                         if (ACPI_SUCCESS(status)) {
1234                                 level++;
1235                                 phandle = chandle;
1236                                 chandle = NULL;
1237                                 parent = child;
1238                         }
1239                 }
1240         }
1241
1242         return_VALUE(0);
1243 }
1244
1245 int
1246 acpi_bus_add(struct acpi_device **child,
1247              struct acpi_device *parent, acpi_handle handle, int type)
1248 {
1249         int result;
1250         struct acpi_bus_ops ops;
1251
1252         ACPI_FUNCTION_TRACE("acpi_bus_add");
1253
1254         result = acpi_add_single_object(child, parent, handle, type);
1255         if (!result) {
1256                 memset(&ops, 0, sizeof(ops));
1257                 ops.acpi_op_add = 1;
1258                 result = acpi_bus_scan(*child, &ops);
1259         }
1260         return_VALUE(result);
1261 }
1262
1263 EXPORT_SYMBOL(acpi_bus_add);
1264
1265 int acpi_bus_start(struct acpi_device *device)
1266 {
1267         int result;
1268         struct acpi_bus_ops ops;
1269
1270         ACPI_FUNCTION_TRACE("acpi_bus_start");
1271
1272         if (!device)
1273                 return_VALUE(-EINVAL);
1274
1275         result = acpi_start_single_object(device);
1276         if (!result) {
1277                 memset(&ops, 0, sizeof(ops));
1278                 ops.acpi_op_start = 1;
1279                 result = acpi_bus_scan(device, &ops);
1280         }
1281         return_VALUE(result);
1282 }
1283
1284 EXPORT_SYMBOL(acpi_bus_start);
1285
1286 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1287 {
1288         acpi_status status;
1289         struct acpi_device *parent, *child;
1290         acpi_handle phandle, chandle;
1291         acpi_object_type type;
1292         u32 level = 1;
1293         int err = 0;
1294
1295         parent = start;
1296         phandle = start->handle;
1297         child = chandle = NULL;
1298
1299         while ((level > 0) && parent && (!err)) {
1300                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1301                                               chandle, &chandle);
1302
1303                 /*
1304                  * If this scope is exhausted then move our way back up.
1305                  */
1306                 if (ACPI_FAILURE(status)) {
1307                         level--;
1308                         chandle = phandle;
1309                         acpi_get_parent(phandle, &phandle);
1310                         child = parent;
1311                         parent = parent->parent;
1312
1313                         if (level == 0)
1314                                 err = acpi_bus_remove(child, rmdevice);
1315                         else
1316                                 err = acpi_bus_remove(child, 1);
1317
1318                         continue;
1319                 }
1320
1321                 status = acpi_get_type(chandle, &type);
1322                 if (ACPI_FAILURE(status)) {
1323                         continue;
1324                 }
1325                 /*
1326                  * If there is a device corresponding to chandle then
1327                  * parse it (depth-first).
1328                  */
1329                 if (acpi_bus_get_device(chandle, &child) == 0) {
1330                         level++;
1331                         phandle = chandle;
1332                         chandle = NULL;
1333                         parent = child;
1334                 }
1335                 continue;
1336         }
1337         return err;
1338 }
1339 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1340
1341
1342 static int acpi_bus_scan_fixed(struct acpi_device *root)
1343 {
1344         int result = 0;
1345         struct acpi_device *device = NULL;
1346
1347         ACPI_FUNCTION_TRACE("acpi_bus_scan_fixed");
1348
1349         if (!root)
1350                 return_VALUE(-ENODEV);
1351
1352         /*
1353          * Enumerate all fixed-feature devices.
1354          */
1355         if (acpi_fadt.pwr_button == 0) {
1356                 result = acpi_add_single_object(&device, acpi_root,
1357                                                 NULL,
1358                                                 ACPI_BUS_TYPE_POWER_BUTTON);
1359                 if (!result)
1360                         result = acpi_start_single_object(device);
1361         }
1362
1363         if (acpi_fadt.sleep_button == 0) {
1364                 result = acpi_add_single_object(&device, acpi_root,
1365                                                 NULL,
1366                                                 ACPI_BUS_TYPE_SLEEP_BUTTON);
1367                 if (!result)
1368                         result = acpi_start_single_object(device);
1369         }
1370
1371         return_VALUE(result);
1372 }
1373
1374 static int __init acpi_scan_init(void)
1375 {
1376         int result;
1377         struct acpi_bus_ops ops;
1378
1379         ACPI_FUNCTION_TRACE("acpi_scan_init");
1380
1381         if (acpi_disabled)
1382                 return_VALUE(0);
1383
1384         kset_register(&acpi_namespace_kset);
1385
1386         /*
1387          * Create the root device in the bus's device tree
1388          */
1389         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1390                                         ACPI_BUS_TYPE_SYSTEM);
1391         if (result)
1392                 goto Done;
1393
1394         result = acpi_start_single_object(acpi_root);
1395
1396         /*
1397          * Enumerate devices in the ACPI namespace.
1398          */
1399         result = acpi_bus_scan_fixed(acpi_root);
1400         if (!result) {
1401                 memset(&ops, 0, sizeof(ops));
1402                 ops.acpi_op_add = 1;
1403                 ops.acpi_op_start = 1;
1404                 result = acpi_bus_scan(acpi_root, &ops);
1405         }
1406
1407         if (result)
1408                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1409
1410       Done:
1411         return_VALUE(result);
1412 }
1413
1414 subsys_initcall(acpi_scan_init);