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