ACPI: fix a regression of ACPI device driver autoloading
[sfrench/cifs-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/kernel.h>
8 #include <linux/acpi.h>
9
10 #include <acpi/acpi_drivers.h>
11 #include <acpi/acinterp.h>      /* for acpi_ex_eisa_id_to_string() */
12
13 #define _COMPONENT              ACPI_BUS_COMPONENT
14 ACPI_MODULE_NAME("scan");
15 #define STRUCT_TO_INT(s)        (*((int*)&s))
16 extern struct acpi_device *acpi_root;
17
18 #define ACPI_BUS_CLASS                  "system_bus"
19 #define ACPI_BUS_HID                    "LNXSYBUS"
20 #define ACPI_BUS_DEVICE_NAME            "System Bus"
21
22 static LIST_HEAD(acpi_device_list);
23 static LIST_HEAD(acpi_bus_id_list);
24 DEFINE_SPINLOCK(acpi_device_lock);
25 LIST_HEAD(acpi_wakeup_device_list);
26
27 struct acpi_device_bus_id{
28         char bus_id[15];
29         unsigned int instance_no;
30         struct list_head node;
31 };
32
33 /*
34  * Creates hid/cid(s) string needed for modalias and uevent
35  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
36  * char *modalias: "acpi:IBM0001:ACPI0001"
37 */
38 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
39                            int size)
40 {
41         int len;
42         int count;
43
44         if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
45                 return -ENODEV;
46
47         len = snprintf(modalias, size, "acpi:");
48         size -= len;
49
50         if (acpi_dev->flags.hardware_id) {
51                 count = snprintf(&modalias[len], size, "%s:",
52                                  acpi_dev->pnp.hardware_id);
53                 if (count < 0 || count >= size)
54                         return -EINVAL;
55                 len += count;
56                 size -= count;
57         }
58
59         if (acpi_dev->flags.compatible_ids) {
60                 struct acpi_compatible_id_list *cid_list;
61                 int i;
62
63                 cid_list = acpi_dev->pnp.cid_list;
64                 for (i = 0; i < cid_list->count; i++) {
65                         count = snprintf(&modalias[len], size, "%s:",
66                                          cid_list->id[i].value);
67                         if (count < 0 || count >= size) {
68                                 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
69                                        acpi_dev->pnp.device_name, i);
70                                 break;
71                         }
72                         len += count;
73                         size -= count;
74                 }
75         }
76
77         modalias[len] = '\0';
78         return len;
79 }
80
81 static ssize_t
82 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
83         struct acpi_device *acpi_dev = to_acpi_device(dev);
84         int len;
85
86         /* Device has no HID and no CID or string is >1024 */
87         len = create_modalias(acpi_dev, buf, 1024);
88         if (len <= 0)
89                 return 0;
90         buf[len++] = '\n';
91         return len;
92 }
93 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
94
95 static int acpi_eject_operation(acpi_handle handle, int lockable)
96 {
97         struct acpi_object_list arg_list;
98         union acpi_object arg;
99         acpi_status status = AE_OK;
100
101         /*
102          * TBD: evaluate _PS3?
103          */
104
105         if (lockable) {
106                 arg_list.count = 1;
107                 arg_list.pointer = &arg;
108                 arg.type = ACPI_TYPE_INTEGER;
109                 arg.integer.value = 0;
110                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
111         }
112
113         arg_list.count = 1;
114         arg_list.pointer = &arg;
115         arg.type = ACPI_TYPE_INTEGER;
116         arg.integer.value = 1;
117
118         /*
119          * TBD: _EJD support.
120          */
121
122         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
123         if (ACPI_FAILURE(status)) {
124                 return (-ENODEV);
125         }
126
127         return (0);
128 }
129
130 static ssize_t
131 acpi_eject_store(struct device *d, struct device_attribute *attr,
132                 const char *buf, size_t count)
133 {
134         int result;
135         int ret = count;
136         int islockable;
137         acpi_status status;
138         acpi_handle handle;
139         acpi_object_type type = 0;
140         struct acpi_device *acpi_device = to_acpi_device(d);
141
142         if ((!count) || (buf[0] != '1')) {
143                 return -EINVAL;
144         }
145 #ifndef FORCE_EJECT
146         if (acpi_device->driver == NULL) {
147                 ret = -ENODEV;
148                 goto err;
149         }
150 #endif
151         status = acpi_get_type(acpi_device->handle, &type);
152         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
153                 ret = -ENODEV;
154                 goto err;
155         }
156
157         islockable = acpi_device->flags.lockable;
158         handle = acpi_device->handle;
159
160         result = acpi_bus_trim(acpi_device, 1);
161
162         if (!result)
163                 result = acpi_eject_operation(handle, islockable);
164
165         if (result) {
166                 ret = -EBUSY;
167         }
168       err:
169         return ret;
170 }
171
172 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
173
174 static ssize_t
175 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
176         struct acpi_device *acpi_dev = to_acpi_device(dev);
177
178         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
179 }
180 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
181
182 static ssize_t
183 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
184         struct acpi_device *acpi_dev = to_acpi_device(dev);
185         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
186         int result;
187
188         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
189         if(result)
190                 goto end;
191
192         result = sprintf(buf, "%s\n", (char*)path.pointer);
193         kfree(path.pointer);
194   end:
195         return result;
196 }
197 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
198
199 static int acpi_device_setup_files(struct acpi_device *dev)
200 {
201         acpi_status status;
202         acpi_handle temp;
203         int result = 0;
204
205         /*
206          * Devices gotten from FADT don't have a "path" attribute
207          */
208         if(dev->handle) {
209                 result = device_create_file(&dev->dev, &dev_attr_path);
210                 if(result)
211                         goto end;
212         }
213
214         if(dev->flags.hardware_id) {
215                 result = device_create_file(&dev->dev, &dev_attr_hid);
216                 if(result)
217                         goto end;
218         }
219
220         if (dev->flags.hardware_id || dev->flags.compatible_ids){
221                 result = device_create_file(&dev->dev, &dev_attr_modalias);
222                 if(result)
223                         goto end;
224         }
225
226         /*
227          * If device has _EJ0, 'eject' file is created that is used to trigger
228          * hot-removal function from userland.
229          */
230         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
231         if (ACPI_SUCCESS(status))
232                 result = device_create_file(&dev->dev, &dev_attr_eject);
233   end:
234         return result;
235 }
236
237 static void acpi_device_remove_files(struct acpi_device *dev)
238 {
239         acpi_status status;
240         acpi_handle temp;
241
242         /*
243          * If device has _EJ0, 'eject' file is created that is used to trigger
244          * hot-removal function from userland.
245          */
246         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
247         if (ACPI_SUCCESS(status))
248                 device_remove_file(&dev->dev, &dev_attr_eject);
249
250         if (dev->flags.hardware_id || dev->flags.compatible_ids)
251                 device_remove_file(&dev->dev, &dev_attr_modalias);
252
253         if(dev->flags.hardware_id)
254                 device_remove_file(&dev->dev, &dev_attr_hid);
255         if(dev->handle)
256                 device_remove_file(&dev->dev, &dev_attr_path);
257 }
258 /* --------------------------------------------------------------------------
259                         ACPI Bus operations
260    -------------------------------------------------------------------------- */
261
262 int acpi_match_device_ids(struct acpi_device *device,
263                           const struct acpi_device_id *ids)
264 {
265         const struct acpi_device_id *id;
266
267         if (device->flags.hardware_id) {
268                 for (id = ids; id->id[0]; id++) {
269                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
270                                 return 0;
271                 }
272         }
273
274         if (device->flags.compatible_ids) {
275                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
276                 int i;
277
278                 for (id = ids; id->id[0]; id++) {
279                         /* compare multiple _CID entries against driver ids */
280                         for (i = 0; i < cid_list->count; i++) {
281                                 if (!strcmp((char*)id->id,
282                                             cid_list->id[i].value))
283                                         return 0;
284                         }
285                 }
286         }
287
288         return -ENOENT;
289 }
290 EXPORT_SYMBOL(acpi_match_device_ids);
291
292 static void acpi_device_release(struct device *dev)
293 {
294         struct acpi_device *acpi_dev = to_acpi_device(dev);
295
296         kfree(acpi_dev->pnp.cid_list);
297         kfree(acpi_dev);
298 }
299
300 static int acpi_device_suspend(struct device *dev, pm_message_t state)
301 {
302         struct acpi_device *acpi_dev = to_acpi_device(dev);
303         struct acpi_driver *acpi_drv = acpi_dev->driver;
304
305         if (acpi_drv && acpi_drv->ops.suspend)
306                 return acpi_drv->ops.suspend(acpi_dev, state);
307         return 0;
308 }
309
310 static int acpi_device_resume(struct device *dev)
311 {
312         struct acpi_device *acpi_dev = to_acpi_device(dev);
313         struct acpi_driver *acpi_drv = acpi_dev->driver;
314
315         if (acpi_drv && acpi_drv->ops.resume)
316                 return acpi_drv->ops.resume(acpi_dev);
317         return 0;
318 }
319
320 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
321 {
322         struct acpi_device *acpi_dev = to_acpi_device(dev);
323         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
324
325         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
326 }
327
328 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
329 {
330         struct acpi_device *acpi_dev = to_acpi_device(dev);
331         int len;
332
333         if (add_uevent_var(env, "MODALIAS="))
334                 return -ENOMEM;
335         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
336                               sizeof(env->buf) - env->buflen);
337         if (len >= (sizeof(env->buf) - env->buflen))
338                 return -ENOMEM;
339         env->buflen += len;
340         return 0;
341 }
342
343 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
344 static int acpi_start_single_object(struct acpi_device *);
345 static int acpi_device_probe(struct device * dev)
346 {
347         struct acpi_device *acpi_dev = to_acpi_device(dev);
348         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
349         int ret;
350
351         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
352         if (!ret) {
353                 if (acpi_dev->bus_ops.acpi_op_start)
354                         acpi_start_single_object(acpi_dev);
355                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
356                         "Found driver [%s] for device [%s]\n",
357                         acpi_drv->name, acpi_dev->pnp.bus_id));
358                 get_device(dev);
359         }
360         return ret;
361 }
362
363 static int acpi_device_remove(struct device * dev)
364 {
365         struct acpi_device *acpi_dev = to_acpi_device(dev);
366         struct acpi_driver *acpi_drv = acpi_dev->driver;
367
368         if (acpi_drv) {
369                 if (acpi_drv->ops.stop)
370                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
371                 if (acpi_drv->ops.remove)
372                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
373         }
374         acpi_dev->driver = NULL;
375         acpi_driver_data(dev) = NULL;
376
377         put_device(dev);
378         return 0;
379 }
380
381 static void acpi_device_shutdown(struct device *dev)
382 {
383         struct acpi_device *acpi_dev = to_acpi_device(dev);
384         struct acpi_driver *acpi_drv = acpi_dev->driver;
385
386         if (acpi_drv && acpi_drv->ops.shutdown)
387                 acpi_drv->ops.shutdown(acpi_dev);
388
389         return ;
390 }
391
392 struct bus_type acpi_bus_type = {
393         .name           = "acpi",
394         .suspend        = acpi_device_suspend,
395         .resume         = acpi_device_resume,
396         .shutdown       = acpi_device_shutdown,
397         .match          = acpi_bus_match,
398         .probe          = acpi_device_probe,
399         .remove         = acpi_device_remove,
400         .uevent         = acpi_device_uevent,
401 };
402
403 static int acpi_device_register(struct acpi_device *device,
404                                  struct acpi_device *parent)
405 {
406         int result;
407         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
408         int found = 0;
409         /*
410          * Linkage
411          * -------
412          * Link this device to its parent and siblings.
413          */
414         INIT_LIST_HEAD(&device->children);
415         INIT_LIST_HEAD(&device->node);
416         INIT_LIST_HEAD(&device->g_list);
417         INIT_LIST_HEAD(&device->wakeup_list);
418
419         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
420         if (!new_bus_id) {
421                 printk(KERN_ERR PREFIX "Memory allocation error\n");
422                 return -ENOMEM;
423         }
424
425         spin_lock(&acpi_device_lock);
426         /*
427          * Find suitable bus_id and instance number in acpi_bus_id_list
428          * If failed, create one and link it into acpi_bus_id_list
429          */
430         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
431                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
432                         acpi_device_bus_id->instance_no ++;
433                         found = 1;
434                         kfree(new_bus_id);
435                         break;
436                 }
437         }
438         if(!found) {
439                 acpi_device_bus_id = new_bus_id;
440                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
441                 acpi_device_bus_id->instance_no = 0;
442                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
443         }
444         sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
445
446         if (device->parent) {
447                 list_add_tail(&device->node, &device->parent->children);
448                 list_add_tail(&device->g_list, &device->parent->g_list);
449         } else
450                 list_add_tail(&device->g_list, &acpi_device_list);
451         if (device->wakeup.flags.valid)
452                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
453         spin_unlock(&acpi_device_lock);
454
455         if (device->parent)
456                 device->dev.parent = &parent->dev;
457         device->dev.bus = &acpi_bus_type;
458         device_initialize(&device->dev);
459         device->dev.release = &acpi_device_release;
460         result = device_add(&device->dev);
461         if(result) {
462                 printk(KERN_ERR PREFIX "Error adding device %s", device->dev.bus_id);
463                 goto end;
464         }
465
466         result = acpi_device_setup_files(device);
467         if(result)
468                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id));
469
470         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
471         return 0;
472   end:
473         spin_lock(&acpi_device_lock);
474         if (device->parent) {
475                 list_del(&device->node);
476                 list_del(&device->g_list);
477         } else
478                 list_del(&device->g_list);
479         list_del(&device->wakeup_list);
480         spin_unlock(&acpi_device_lock);
481         return result;
482 }
483
484 static void acpi_device_unregister(struct acpi_device *device, int type)
485 {
486         spin_lock(&acpi_device_lock);
487         if (device->parent) {
488                 list_del(&device->node);
489                 list_del(&device->g_list);
490         } else
491                 list_del(&device->g_list);
492
493         list_del(&device->wakeup_list);
494         spin_unlock(&acpi_device_lock);
495
496         acpi_detach_data(device->handle, acpi_bus_data_handler);
497
498         acpi_device_remove_files(device);
499         device_unregister(&device->dev);
500 }
501
502 /* --------------------------------------------------------------------------
503                                  Driver Management
504    -------------------------------------------------------------------------- */
505 /**
506  * acpi_bus_driver_init - add a device to a driver
507  * @device: the device to add and initialize
508  * @driver: driver for the device
509  *
510  * Used to initialize a device via its device driver.  Called whenever a 
511  * driver is bound to a device.  Invokes the driver's add() ops.
512  */
513 static int
514 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
515 {
516         int result = 0;
517
518
519         if (!device || !driver)
520                 return -EINVAL;
521
522         if (!driver->ops.add)
523                 return -ENOSYS;
524
525         result = driver->ops.add(device);
526         if (result) {
527                 device->driver = NULL;
528                 acpi_driver_data(device) = NULL;
529                 return result;
530         }
531
532         device->driver = driver;
533
534         /*
535          * TBD - Configuration Management: Assign resources to device based
536          * upon possible configuration and currently allocated resources.
537          */
538
539         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
540                           "Driver successfully bound to device\n"));
541         return 0;
542 }
543
544 static int acpi_start_single_object(struct acpi_device *device)
545 {
546         int result = 0;
547         struct acpi_driver *driver;
548
549
550         if (!(driver = device->driver))
551                 return 0;
552
553         if (driver->ops.start) {
554                 result = driver->ops.start(device);
555                 if (result && driver->ops.remove)
556                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
557         }
558
559         return result;
560 }
561
562 /**
563  * acpi_bus_register_driver - register a driver with the ACPI bus
564  * @driver: driver being registered
565  *
566  * Registers a driver with the ACPI bus.  Searches the namespace for all
567  * devices that match the driver's criteria and binds.  Returns zero for
568  * success or a negative error status for failure.
569  */
570 int acpi_bus_register_driver(struct acpi_driver *driver)
571 {
572         int ret;
573
574         if (acpi_disabled)
575                 return -ENODEV;
576         driver->drv.name = driver->name;
577         driver->drv.bus = &acpi_bus_type;
578         driver->drv.owner = driver->owner;
579
580         ret = driver_register(&driver->drv);
581         return ret;
582 }
583
584 EXPORT_SYMBOL(acpi_bus_register_driver);
585
586 /**
587  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
588  * @driver: driver to unregister
589  *
590  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
591  * devices that match the driver's criteria and unbinds.
592  */
593 void acpi_bus_unregister_driver(struct acpi_driver *driver)
594 {
595         driver_unregister(&driver->drv);
596 }
597
598 EXPORT_SYMBOL(acpi_bus_unregister_driver);
599
600 /* --------------------------------------------------------------------------
601                                  Device Enumeration
602    -------------------------------------------------------------------------- */
603 acpi_status
604 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
605 {
606         acpi_status status;
607         acpi_handle tmp;
608         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
609         union acpi_object *obj;
610
611         status = acpi_get_handle(handle, "_EJD", &tmp);
612         if (ACPI_FAILURE(status))
613                 return status;
614
615         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
616         if (ACPI_SUCCESS(status)) {
617                 obj = buffer.pointer;
618                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
619                                          ejd);
620                 kfree(buffer.pointer);
621         }
622         return status;
623 }
624 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
625
626 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
627 {
628
629         /* TBD */
630
631         return;
632 }
633
634 static int acpi_bus_get_perf_flags(struct acpi_device *device)
635 {
636         device->performance.state = ACPI_STATE_UNKNOWN;
637         return 0;
638 }
639
640 static acpi_status
641 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
642                                              union acpi_object *package)
643 {
644         int i = 0;
645         union acpi_object *element = NULL;
646
647         if (!device || !package || (package->package.count < 2))
648                 return AE_BAD_PARAMETER;
649
650         element = &(package->package.elements[0]);
651         if (!element)
652                 return AE_BAD_PARAMETER;
653         if (element->type == ACPI_TYPE_PACKAGE) {
654                 if ((element->package.count < 2) ||
655                     (element->package.elements[0].type !=
656                      ACPI_TYPE_LOCAL_REFERENCE)
657                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
658                         return AE_BAD_DATA;
659                 device->wakeup.gpe_device =
660                     element->package.elements[0].reference.handle;
661                 device->wakeup.gpe_number =
662                     (u32) element->package.elements[1].integer.value;
663         } else if (element->type == ACPI_TYPE_INTEGER) {
664                 device->wakeup.gpe_number = element->integer.value;
665         } else
666                 return AE_BAD_DATA;
667
668         element = &(package->package.elements[1]);
669         if (element->type != ACPI_TYPE_INTEGER) {
670                 return AE_BAD_DATA;
671         }
672         device->wakeup.sleep_state = element->integer.value;
673
674         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
675                 return AE_NO_MEMORY;
676         }
677         device->wakeup.resources.count = package->package.count - 2;
678         for (i = 0; i < device->wakeup.resources.count; i++) {
679                 element = &(package->package.elements[i + 2]);
680                 if (element->type != ACPI_TYPE_ANY) {
681                         return AE_BAD_DATA;
682                 }
683
684                 device->wakeup.resources.handles[i] = element->reference.handle;
685         }
686
687         return AE_OK;
688 }
689
690 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
691 {
692         acpi_status status = 0;
693         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
694         union acpi_object *package = NULL;
695
696         struct acpi_device_id button_device_ids[] = {
697                 {"PNP0C0D", 0},
698                 {"PNP0C0C", 0},
699                 {"PNP0C0E", 0},
700                 {"", 0},
701         };
702
703
704         /* _PRW */
705         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
706         if (ACPI_FAILURE(status)) {
707                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
708                 goto end;
709         }
710
711         package = (union acpi_object *)buffer.pointer;
712         status = acpi_bus_extract_wakeup_device_power_package(device, package);
713         if (ACPI_FAILURE(status)) {
714                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
715                 goto end;
716         }
717
718         kfree(buffer.pointer);
719
720         device->wakeup.flags.valid = 1;
721         /* Power button, Lid switch always enable wakeup */
722         if (!acpi_match_device_ids(device, button_device_ids))
723                 device->wakeup.flags.run_wake = 1;
724
725       end:
726         if (ACPI_FAILURE(status))
727                 device->flags.wake_capable = 0;
728         return 0;
729 }
730
731 static int acpi_bus_get_power_flags(struct acpi_device *device)
732 {
733         acpi_status status = 0;
734         acpi_handle handle = NULL;
735         u32 i = 0;
736
737
738         /*
739          * Power Management Flags
740          */
741         status = acpi_get_handle(device->handle, "_PSC", &handle);
742         if (ACPI_SUCCESS(status))
743                 device->power.flags.explicit_get = 1;
744         status = acpi_get_handle(device->handle, "_IRC", &handle);
745         if (ACPI_SUCCESS(status))
746                 device->power.flags.inrush_current = 1;
747
748         /*
749          * Enumerate supported power management states
750          */
751         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
752                 struct acpi_device_power_state *ps = &device->power.states[i];
753                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
754
755                 /* Evaluate "_PRx" to se if power resources are referenced */
756                 acpi_evaluate_reference(device->handle, object_name, NULL,
757                                         &ps->resources);
758                 if (ps->resources.count) {
759                         device->power.flags.power_resources = 1;
760                         ps->flags.valid = 1;
761                 }
762
763                 /* Evaluate "_PSx" to see if we can do explicit sets */
764                 object_name[2] = 'S';
765                 status = acpi_get_handle(device->handle, object_name, &handle);
766                 if (ACPI_SUCCESS(status)) {
767                         ps->flags.explicit_set = 1;
768                         ps->flags.valid = 1;
769                 }
770
771                 /* State is valid if we have some power control */
772                 if (ps->resources.count || ps->flags.explicit_set)
773                         ps->flags.valid = 1;
774
775                 ps->power = -1; /* Unknown - driver assigned */
776                 ps->latency = -1;       /* Unknown - driver assigned */
777         }
778
779         /* Set defaults for D0 and D3 states (always valid) */
780         device->power.states[ACPI_STATE_D0].flags.valid = 1;
781         device->power.states[ACPI_STATE_D0].power = 100;
782         device->power.states[ACPI_STATE_D3].flags.valid = 1;
783         device->power.states[ACPI_STATE_D3].power = 0;
784
785         /* TBD: System wake support and resource requirements. */
786
787         device->power.state = ACPI_STATE_UNKNOWN;
788
789         return 0;
790 }
791
792 static int acpi_bus_get_flags(struct acpi_device *device)
793 {
794         acpi_status status = AE_OK;
795         acpi_handle temp = NULL;
796
797
798         /* Presence of _STA indicates 'dynamic_status' */
799         status = acpi_get_handle(device->handle, "_STA", &temp);
800         if (ACPI_SUCCESS(status))
801                 device->flags.dynamic_status = 1;
802
803         /* Presence of _CID indicates 'compatible_ids' */
804         status = acpi_get_handle(device->handle, "_CID", &temp);
805         if (ACPI_SUCCESS(status))
806                 device->flags.compatible_ids = 1;
807
808         /* Presence of _RMV indicates 'removable' */
809         status = acpi_get_handle(device->handle, "_RMV", &temp);
810         if (ACPI_SUCCESS(status))
811                 device->flags.removable = 1;
812
813         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
814         status = acpi_get_handle(device->handle, "_EJD", &temp);
815         if (ACPI_SUCCESS(status))
816                 device->flags.ejectable = 1;
817         else {
818                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
819                 if (ACPI_SUCCESS(status))
820                         device->flags.ejectable = 1;
821         }
822
823         /* Presence of _LCK indicates 'lockable' */
824         status = acpi_get_handle(device->handle, "_LCK", &temp);
825         if (ACPI_SUCCESS(status))
826                 device->flags.lockable = 1;
827
828         /* Presence of _PS0|_PR0 indicates 'power manageable' */
829         status = acpi_get_handle(device->handle, "_PS0", &temp);
830         if (ACPI_FAILURE(status))
831                 status = acpi_get_handle(device->handle, "_PR0", &temp);
832         if (ACPI_SUCCESS(status))
833                 device->flags.power_manageable = 1;
834
835         /* Presence of _PRW indicates wake capable */
836         status = acpi_get_handle(device->handle, "_PRW", &temp);
837         if (ACPI_SUCCESS(status))
838                 device->flags.wake_capable = 1;
839
840         /* TBD: Performance management */
841
842         return 0;
843 }
844
845 static void acpi_device_get_busid(struct acpi_device *device,
846                                   acpi_handle handle, int type)
847 {
848         char bus_id[5] = { '?', 0 };
849         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
850         int i = 0;
851
852         /*
853          * Bus ID
854          * ------
855          * The device's Bus ID is simply the object name.
856          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
857          */
858         switch (type) {
859         case ACPI_BUS_TYPE_SYSTEM:
860                 strcpy(device->pnp.bus_id, "ACPI");
861                 break;
862         case ACPI_BUS_TYPE_POWER_BUTTON:
863                 strcpy(device->pnp.bus_id, "PWRF");
864                 break;
865         case ACPI_BUS_TYPE_SLEEP_BUTTON:
866                 strcpy(device->pnp.bus_id, "SLPF");
867                 break;
868         default:
869                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
870                 /* Clean up trailing underscores (if any) */
871                 for (i = 3; i > 1; i--) {
872                         if (bus_id[i] == '_')
873                                 bus_id[i] = '\0';
874                         else
875                                 break;
876                 }
877                 strcpy(device->pnp.bus_id, bus_id);
878                 break;
879         }
880 }
881
882 static int
883 acpi_video_bus_match(struct acpi_device *device)
884 {
885         acpi_handle h_dummy1;
886         acpi_handle h_dummy2;
887         acpi_handle h_dummy3;
888
889
890         if (!device)
891                 return -EINVAL;
892
893         /* Since there is no HID, CID for ACPI Video drivers, we have
894          * to check well known required nodes for each feature we support.
895          */
896
897         /* Does this device able to support video switching ? */
898         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
899             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
900                 return 0;
901
902         /* Does this device able to retrieve a video ROM ? */
903         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
904                 return 0;
905
906         /* Does this device able to configure which video head to be POSTed ? */
907         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
908             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
909             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
910                 return 0;
911
912         return -ENODEV;
913 }
914
915 /*
916  * acpi_bay_match - see if a device is an ejectable driver bay
917  *
918  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
919  * then we can safely call it an ejectable drive bay
920  */
921 static int acpi_bay_match(struct acpi_device *device){
922         acpi_status status;
923         acpi_handle handle;
924         acpi_handle tmp;
925         acpi_handle phandle;
926
927         handle = device->handle;
928
929         status = acpi_get_handle(handle, "_EJ0", &tmp);
930         if (ACPI_FAILURE(status))
931                 return -ENODEV;
932
933         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
934                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
935                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
936                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
937                 return 0;
938
939         if (acpi_get_parent(handle, &phandle))
940                 return -ENODEV;
941
942         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
943                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
944                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
945                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
946                 return 0;
947
948         return -ENODEV;
949 }
950
951 /*
952  * acpi_dock_match - see if a device has a _DCK method
953  */
954 static int acpi_dock_match(struct acpi_device *device)
955 {
956         acpi_handle tmp;
957         return acpi_get_handle(device->handle, "_DCK", &tmp);
958 }
959
960 static void acpi_device_set_id(struct acpi_device *device,
961                                struct acpi_device *parent, acpi_handle handle,
962                                int type)
963 {
964         struct acpi_device_info *info;
965         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
966         char *hid = NULL;
967         char *uid = NULL;
968         struct acpi_compatible_id_list *cid_list = NULL;
969         const char *cid_add = NULL;
970         acpi_status status;
971
972         switch (type) {
973         case ACPI_BUS_TYPE_DEVICE:
974                 status = acpi_get_object_info(handle, &buffer);
975                 if (ACPI_FAILURE(status)) {
976                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
977                         return;
978                 }
979
980                 info = buffer.pointer;
981                 if (info->valid & ACPI_VALID_HID)
982                         hid = info->hardware_id.value;
983                 if (info->valid & ACPI_VALID_UID)
984                         uid = info->unique_id.value;
985                 if (info->valid & ACPI_VALID_CID)
986                         cid_list = &info->compatibility_id;
987                 if (info->valid & ACPI_VALID_ADR) {
988                         device->pnp.bus_address = info->address;
989                         device->flags.bus_address = 1;
990                 }
991
992                 /* If we have a video/bay/dock device, add our selfdefined
993                    HID to the CID list. Like that the video/bay/dock drivers
994                    will get autoloaded and the device might still match
995                    against another driver.
996                 */
997                 if (ACPI_SUCCESS(acpi_video_bus_match(device)))
998                         cid_add = ACPI_VIDEO_HID;
999                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1000                         cid_add = ACPI_BAY_HID;
1001                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1002                         cid_add = ACPI_DOCK_HID;
1003
1004                 break;
1005         case ACPI_BUS_TYPE_POWER:
1006                 hid = ACPI_POWER_HID;
1007                 break;
1008         case ACPI_BUS_TYPE_PROCESSOR:
1009                 hid = ACPI_PROCESSOR_HID;
1010                 break;
1011         case ACPI_BUS_TYPE_SYSTEM:
1012                 hid = ACPI_SYSTEM_HID;
1013                 break;
1014         case ACPI_BUS_TYPE_THERMAL:
1015                 hid = ACPI_THERMAL_HID;
1016                 break;
1017         case ACPI_BUS_TYPE_POWER_BUTTON:
1018                 hid = ACPI_BUTTON_HID_POWERF;
1019                 break;
1020         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1021                 hid = ACPI_BUTTON_HID_SLEEPF;
1022                 break;
1023         }
1024
1025         /* 
1026          * \_SB
1027          * ----
1028          * Fix for the system root bus device -- the only root-level device.
1029          */
1030         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1031                 hid = ACPI_BUS_HID;
1032                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1033                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1034         }
1035
1036         if (hid) {
1037                 strcpy(device->pnp.hardware_id, hid);
1038                 device->flags.hardware_id = 1;
1039         }
1040         if (uid) {
1041                 strcpy(device->pnp.unique_id, uid);
1042                 device->flags.unique_id = 1;
1043         }
1044         if (cid_list || cid_add) {
1045                 struct  acpi_compatible_id_list *list;
1046                 int size = 0;
1047                 int count = 0;
1048
1049                 if (cid_list) {
1050                         size = cid_list->size;
1051                 } else if (cid_add) {
1052                         size = sizeof(struct acpi_compatible_id_list);
1053                         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1054                         if (!cid_list) {
1055                                 printk(KERN_ERR "Memory allocation error\n");
1056                                 kfree(buffer.pointer);
1057                                 return;
1058                         } else {
1059                                 cid_list->count = 0;
1060                                 cid_list->size = size;
1061                         }
1062                 }
1063                 if (cid_add)
1064                         size += sizeof(struct acpi_compatible_id);
1065                 list = kmalloc(size, GFP_KERNEL);
1066
1067                 if (list) {
1068                         if (cid_list) {
1069                                 memcpy(list, cid_list, cid_list->size);
1070                                 count = cid_list->count;
1071                         }
1072                         if (cid_add) {
1073                                 strncpy(list->id[count].value, cid_add,
1074                                         ACPI_MAX_CID_LENGTH);
1075                                 count++;
1076                                 device->flags.compatible_ids = 1;
1077                         }
1078                         list->size = size;
1079                         list->count = count;
1080                         device->pnp.cid_list = list;
1081                 } else
1082                         printk(KERN_ERR PREFIX "Memory allocation error\n");
1083         }
1084
1085         kfree(buffer.pointer);
1086 }
1087
1088 static int acpi_device_set_context(struct acpi_device *device, int type)
1089 {
1090         acpi_status status = AE_OK;
1091         int result = 0;
1092         /*
1093          * Context
1094          * -------
1095          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1096          * resolutions from handle->device very efficient.  Note that we need
1097          * to be careful with fixed-feature devices as they all attach to the
1098          * root object.
1099          */
1100         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1101             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1102                 status = acpi_attach_data(device->handle,
1103                                           acpi_bus_data_handler, device);
1104
1105                 if (ACPI_FAILURE(status)) {
1106                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1107                         result = -ENODEV;
1108                 }
1109         }
1110         return result;
1111 }
1112
1113 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1114 {
1115         if (!dev)
1116                 return -EINVAL;
1117
1118         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1119         device_release_driver(&dev->dev);
1120
1121         if (!rmdevice)
1122                 return 0;
1123
1124         /*
1125          * unbind _ADR-Based Devices when hot removal
1126          */
1127         if (dev->flags.bus_address) {
1128                 if ((dev->parent) && (dev->parent->ops.unbind))
1129                         dev->parent->ops.unbind(dev);
1130         }
1131         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1132
1133         return 0;
1134 }
1135
1136 static int
1137 acpi_is_child_device(struct acpi_device *device,
1138                         int (*matcher)(struct acpi_device *))
1139 {
1140         int result = -ENODEV;
1141
1142         do {
1143                 if (ACPI_SUCCESS(matcher(device)))
1144                         return AE_OK;
1145         } while ((device = device->parent));
1146
1147         return result;
1148 }
1149
1150 static int
1151 acpi_add_single_object(struct acpi_device **child,
1152                        struct acpi_device *parent, acpi_handle handle, int type,
1153                         struct acpi_bus_ops *ops)
1154 {
1155         int result = 0;
1156         struct acpi_device *device = NULL;
1157
1158
1159         if (!child)
1160                 return -EINVAL;
1161
1162         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1163         if (!device) {
1164                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1165                 return -ENOMEM;
1166         }
1167
1168         device->handle = handle;
1169         device->parent = parent;
1170         device->bus_ops = *ops; /* workround for not call .start */
1171
1172
1173         acpi_device_get_busid(device, handle, type);
1174
1175         /*
1176          * Flags
1177          * -----
1178          * Get prior to calling acpi_bus_get_status() so we know whether
1179          * or not _STA is present.  Note that we only look for object
1180          * handles -- cannot evaluate objects until we know the device is
1181          * present and properly initialized.
1182          */
1183         result = acpi_bus_get_flags(device);
1184         if (result)
1185                 goto end;
1186
1187         /*
1188          * Status
1189          * ------
1190          * See if the device is present.  We always assume that non-Device
1191          * and non-Processor objects (e.g. thermal zones, power resources,
1192          * etc.) are present, functioning, etc. (at least when parent object
1193          * is present).  Note that _STA has a different meaning for some
1194          * objects (e.g. power resources) so we need to be careful how we use
1195          * it.
1196          */
1197         switch (type) {
1198         case ACPI_BUS_TYPE_PROCESSOR:
1199         case ACPI_BUS_TYPE_DEVICE:
1200                 result = acpi_bus_get_status(device);
1201                 if (ACPI_FAILURE(result)) {
1202                         result = -ENODEV;
1203                         goto end;
1204                 }
1205                 if (!device->status.present) {
1206                         /* Bay and dock should be handled even if absent */
1207                         if (!ACPI_SUCCESS(
1208                              acpi_is_child_device(device, acpi_bay_match)) &&
1209                             !ACPI_SUCCESS(
1210                              acpi_is_child_device(device, acpi_dock_match))) {
1211                                         result = -ENODEV;
1212                                         goto end;
1213                         }
1214                 }
1215                 break;
1216         default:
1217                 STRUCT_TO_INT(device->status) =
1218                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1219                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1220                 break;
1221         }
1222
1223         /*
1224          * Initialize Device
1225          * -----------------
1226          * TBD: Synch with Core's enumeration/initialization process.
1227          */
1228
1229         /*
1230          * Hardware ID, Unique ID, & Bus Address
1231          * -------------------------------------
1232          */
1233         acpi_device_set_id(device, parent, handle, type);
1234
1235         /*
1236          * Power Management
1237          * ----------------
1238          */
1239         if (device->flags.power_manageable) {
1240                 result = acpi_bus_get_power_flags(device);
1241                 if (result)
1242                         goto end;
1243         }
1244
1245         /*
1246          * Wakeup device management
1247          *-----------------------
1248          */
1249         if (device->flags.wake_capable) {
1250                 result = acpi_bus_get_wakeup_device_flags(device);
1251                 if (result)
1252                         goto end;
1253         }
1254
1255         /*
1256          * Performance Management
1257          * ----------------------
1258          */
1259         if (device->flags.performance_manageable) {
1260                 result = acpi_bus_get_perf_flags(device);
1261                 if (result)
1262                         goto end;
1263         }
1264
1265         if ((result = acpi_device_set_context(device, type)))
1266                 goto end;
1267
1268         result = acpi_device_register(device, parent);
1269
1270         /*
1271          * Bind _ADR-Based Devices when hot add
1272          */
1273         if (device->flags.bus_address) {
1274                 if (device->parent && device->parent->ops.bind)
1275                         device->parent->ops.bind(device);
1276         }
1277
1278       end:
1279         if (!result)
1280                 *child = device;
1281         else {
1282                 kfree(device->pnp.cid_list);
1283                 kfree(device);
1284         }
1285
1286         return result;
1287 }
1288
1289 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1290 {
1291         acpi_status status = AE_OK;
1292         struct acpi_device *parent = NULL;
1293         struct acpi_device *child = NULL;
1294         acpi_handle phandle = NULL;
1295         acpi_handle chandle = NULL;
1296         acpi_object_type type = 0;
1297         u32 level = 1;
1298
1299
1300         if (!start)
1301                 return -EINVAL;
1302
1303         parent = start;
1304         phandle = start->handle;
1305
1306         /*
1307          * Parse through the ACPI namespace, identify all 'devices', and
1308          * create a new 'struct acpi_device' for each.
1309          */
1310         while ((level > 0) && parent) {
1311
1312                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1313                                               chandle, &chandle);
1314
1315                 /*
1316                  * If this scope is exhausted then move our way back up.
1317                  */
1318                 if (ACPI_FAILURE(status)) {
1319                         level--;
1320                         chandle = phandle;
1321                         acpi_get_parent(phandle, &phandle);
1322                         if (parent->parent)
1323                                 parent = parent->parent;
1324                         continue;
1325                 }
1326
1327                 status = acpi_get_type(chandle, &type);
1328                 if (ACPI_FAILURE(status))
1329                         continue;
1330
1331                 /*
1332                  * If this is a scope object then parse it (depth-first).
1333                  */
1334                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1335                         level++;
1336                         phandle = chandle;
1337                         chandle = NULL;
1338                         continue;
1339                 }
1340
1341                 /*
1342                  * We're only interested in objects that we consider 'devices'.
1343                  */
1344                 switch (type) {
1345                 case ACPI_TYPE_DEVICE:
1346                         type = ACPI_BUS_TYPE_DEVICE;
1347                         break;
1348                 case ACPI_TYPE_PROCESSOR:
1349                         type = ACPI_BUS_TYPE_PROCESSOR;
1350                         break;
1351                 case ACPI_TYPE_THERMAL:
1352                         type = ACPI_BUS_TYPE_THERMAL;
1353                         break;
1354                 case ACPI_TYPE_POWER:
1355                         type = ACPI_BUS_TYPE_POWER;
1356                         break;
1357                 default:
1358                         continue;
1359                 }
1360
1361                 if (ops->acpi_op_add)
1362                         status = acpi_add_single_object(&child, parent,
1363                                 chandle, type, ops);
1364                 else
1365                         status = acpi_bus_get_device(chandle, &child);
1366
1367                 if (ACPI_FAILURE(status))
1368                         continue;
1369
1370                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1371                         status = acpi_start_single_object(child);
1372                         if (ACPI_FAILURE(status))
1373                                 continue;
1374                 }
1375
1376                 /*
1377                  * If the device is present, enabled, and functioning then
1378                  * parse its scope (depth-first).  Note that we need to
1379                  * represent absent devices to facilitate PnP notifications
1380                  * -- but only the subtree head (not all of its children,
1381                  * which will be enumerated when the parent is inserted).
1382                  *
1383                  * TBD: Need notifications and other detection mechanisms
1384                  *      in place before we can fully implement this.
1385                  */
1386                 if (child->status.present) {
1387                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1388                                                       NULL, NULL);
1389                         if (ACPI_SUCCESS(status)) {
1390                                 level++;
1391                                 phandle = chandle;
1392                                 chandle = NULL;
1393                                 parent = child;
1394                         }
1395                 }
1396         }
1397
1398         return 0;
1399 }
1400
1401 int
1402 acpi_bus_add(struct acpi_device **child,
1403              struct acpi_device *parent, acpi_handle handle, int type)
1404 {
1405         int result;
1406         struct acpi_bus_ops ops;
1407
1408         memset(&ops, 0, sizeof(ops));
1409         ops.acpi_op_add = 1;
1410
1411         result = acpi_add_single_object(child, parent, handle, type, &ops);
1412         if (!result)
1413                 result = acpi_bus_scan(*child, &ops);
1414
1415         return result;
1416 }
1417
1418 EXPORT_SYMBOL(acpi_bus_add);
1419
1420 int acpi_bus_start(struct acpi_device *device)
1421 {
1422         int result;
1423         struct acpi_bus_ops ops;
1424
1425
1426         if (!device)
1427                 return -EINVAL;
1428
1429         result = acpi_start_single_object(device);
1430         if (!result) {
1431                 memset(&ops, 0, sizeof(ops));
1432                 ops.acpi_op_start = 1;
1433                 result = acpi_bus_scan(device, &ops);
1434         }
1435         return result;
1436 }
1437
1438 EXPORT_SYMBOL(acpi_bus_start);
1439
1440 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1441 {
1442         acpi_status status;
1443         struct acpi_device *parent, *child;
1444         acpi_handle phandle, chandle;
1445         acpi_object_type type;
1446         u32 level = 1;
1447         int err = 0;
1448
1449         parent = start;
1450         phandle = start->handle;
1451         child = chandle = NULL;
1452
1453         while ((level > 0) && parent && (!err)) {
1454                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1455                                               chandle, &chandle);
1456
1457                 /*
1458                  * If this scope is exhausted then move our way back up.
1459                  */
1460                 if (ACPI_FAILURE(status)) {
1461                         level--;
1462                         chandle = phandle;
1463                         acpi_get_parent(phandle, &phandle);
1464                         child = parent;
1465                         parent = parent->parent;
1466
1467                         if (level == 0)
1468                                 err = acpi_bus_remove(child, rmdevice);
1469                         else
1470                                 err = acpi_bus_remove(child, 1);
1471
1472                         continue;
1473                 }
1474
1475                 status = acpi_get_type(chandle, &type);
1476                 if (ACPI_FAILURE(status)) {
1477                         continue;
1478                 }
1479                 /*
1480                  * If there is a device corresponding to chandle then
1481                  * parse it (depth-first).
1482                  */
1483                 if (acpi_bus_get_device(chandle, &child) == 0) {
1484                         level++;
1485                         phandle = chandle;
1486                         chandle = NULL;
1487                         parent = child;
1488                 }
1489                 continue;
1490         }
1491         return err;
1492 }
1493 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1494
1495
1496 static int acpi_bus_scan_fixed(struct acpi_device *root)
1497 {
1498         int result = 0;
1499         struct acpi_device *device = NULL;
1500         struct acpi_bus_ops ops;
1501
1502         if (!root)
1503                 return -ENODEV;
1504
1505         memset(&ops, 0, sizeof(ops));
1506         ops.acpi_op_add = 1;
1507         ops.acpi_op_start = 1;
1508
1509         /*
1510          * Enumerate all fixed-feature devices.
1511          */
1512         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1513                 result = acpi_add_single_object(&device, acpi_root,
1514                                                 NULL,
1515                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1516                                                 &ops);
1517         }
1518
1519         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1520                 result = acpi_add_single_object(&device, acpi_root,
1521                                                 NULL,
1522                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1523                                                 &ops);
1524         }
1525
1526         return result;
1527 }
1528
1529 int __init acpi_boot_ec_enable(void);
1530
1531 static int __init acpi_scan_init(void)
1532 {
1533         int result;
1534         struct acpi_bus_ops ops;
1535
1536
1537         if (acpi_disabled)
1538                 return 0;
1539
1540         memset(&ops, 0, sizeof(ops));
1541         ops.acpi_op_add = 1;
1542         ops.acpi_op_start = 1;
1543
1544         result = bus_register(&acpi_bus_type);
1545         if (result) {
1546                 /* We don't want to quit even if we failed to add suspend/resume */
1547                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1548         }
1549
1550         /*
1551          * Create the root device in the bus's device tree
1552          */
1553         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1554                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1555         if (result)
1556                 goto Done;
1557
1558         /*
1559          * Enumerate devices in the ACPI namespace.
1560          */
1561         result = acpi_bus_scan_fixed(acpi_root);
1562
1563         /* EC region might be needed at bus_scan, so enable it now */
1564         acpi_boot_ec_enable();
1565
1566         if (!result)
1567                 result = acpi_bus_scan(acpi_root, &ops);
1568
1569         if (result)
1570                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1571
1572       Done:
1573         return result;
1574 }
1575
1576 subsys_initcall(acpi_scan_init);