Pull trivial into test branch
[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                    "ACPI_BUS"
20 #define ACPI_BUS_DRIVER_NAME            "ACPI Bus Driver"
21 #define ACPI_BUS_DEVICE_NAME            "System Bus"
22
23 static LIST_HEAD(acpi_device_list);
24 static LIST_HEAD(acpi_bus_id_list);
25 DEFINE_SPINLOCK(acpi_device_lock);
26 LIST_HEAD(acpi_wakeup_device_list);
27
28 struct acpi_device_bus_id{
29         char bus_id[15];
30         unsigned int instance_no;
31         struct list_head node;
32 };
33 static int acpi_eject_operation(acpi_handle handle, int lockable)
34 {
35         struct acpi_object_list arg_list;
36         union acpi_object arg;
37         acpi_status status = AE_OK;
38
39         /*
40          * TBD: evaluate _PS3?
41          */
42
43         if (lockable) {
44                 arg_list.count = 1;
45                 arg_list.pointer = &arg;
46                 arg.type = ACPI_TYPE_INTEGER;
47                 arg.integer.value = 0;
48                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
49         }
50
51         arg_list.count = 1;
52         arg_list.pointer = &arg;
53         arg.type = ACPI_TYPE_INTEGER;
54         arg.integer.value = 1;
55
56         /*
57          * TBD: _EJD support.
58          */
59
60         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
61         if (ACPI_FAILURE(status)) {
62                 return (-ENODEV);
63         }
64
65         return (0);
66 }
67
68 static ssize_t
69 acpi_eject_store(struct device *d, struct device_attribute *attr,
70                 const char *buf, size_t count)
71 {
72         int result;
73         int ret = count;
74         int islockable;
75         acpi_status status;
76         acpi_handle handle;
77         acpi_object_type type = 0;
78         struct acpi_device *acpi_device = to_acpi_device(d);
79
80         if ((!count) || (buf[0] != '1')) {
81                 return -EINVAL;
82         }
83 #ifndef FORCE_EJECT
84         if (acpi_device->driver == NULL) {
85                 ret = -ENODEV;
86                 goto err;
87         }
88 #endif
89         status = acpi_get_type(acpi_device->handle, &type);
90         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
91                 ret = -ENODEV;
92                 goto err;
93         }
94
95         islockable = acpi_device->flags.lockable;
96         handle = acpi_device->handle;
97
98         result = acpi_bus_trim(acpi_device, 1);
99
100         if (!result)
101                 result = acpi_eject_operation(handle, islockable);
102
103         if (result) {
104                 ret = -EBUSY;
105         }
106       err:
107         return ret;
108 }
109
110 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
111
112 static ssize_t
113 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
114         struct acpi_device *acpi_dev = to_acpi_device(dev);
115
116         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
117 }
118 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
119
120 static ssize_t
121 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
122         struct acpi_device *acpi_dev = to_acpi_device(dev);
123         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
124         int result;
125
126         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
127         if(result)
128                 goto end;
129
130         result = sprintf(buf, "%s\n", (char*)path.pointer);
131         kfree(path.pointer);
132   end:
133         return result;
134 }
135 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
136
137 static int acpi_device_setup_files(struct acpi_device *dev)
138 {
139         acpi_status status;
140         acpi_handle temp;
141         int result = 0;
142
143         /*
144          * Devices gotten from FADT don't have a "path" attribute
145          */
146         if(dev->handle) {
147                 result = device_create_file(&dev->dev, &dev_attr_path);
148                 if(result)
149                         goto end;
150         }
151
152         if(dev->flags.hardware_id) {
153                 result = device_create_file(&dev->dev, &dev_attr_hid);
154                 if(result)
155                         goto end;
156         }
157
158         /*
159          * If device has _EJ0, 'eject' file is created that is used to trigger
160          * hot-removal function from userland.
161          */
162         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
163         if (ACPI_SUCCESS(status))
164                 result = device_create_file(&dev->dev, &dev_attr_eject);
165   end:
166         return result;
167 }
168
169 static void acpi_device_remove_files(struct acpi_device *dev)
170 {
171         acpi_status status;
172         acpi_handle temp;
173
174         /*
175          * If device has _EJ0, 'eject' file is created that is used to trigger
176          * hot-removal function from userland.
177          */
178         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
179         if (ACPI_SUCCESS(status))
180                 device_remove_file(&dev->dev, &dev_attr_eject);
181
182         if(dev->flags.hardware_id)
183                 device_remove_file(&dev->dev, &dev_attr_hid);
184         if(dev->handle)
185                 device_remove_file(&dev->dev, &dev_attr_path);
186 }
187 /* --------------------------------------------------------------------------
188                         ACPI Bus operations
189    -------------------------------------------------------------------------- */
190 static void acpi_device_release(struct device *dev)
191 {
192         struct acpi_device *acpi_dev = to_acpi_device(dev);
193
194         kfree(acpi_dev->pnp.cid_list);
195         kfree(acpi_dev);
196 }
197
198 static int acpi_device_suspend(struct device *dev, pm_message_t state)
199 {
200         struct acpi_device *acpi_dev = to_acpi_device(dev);
201         struct acpi_driver *acpi_drv = acpi_dev->driver;
202
203         if (acpi_drv && acpi_drv->ops.suspend)
204                 return acpi_drv->ops.suspend(acpi_dev, state);
205         return 0;
206 }
207
208 static int acpi_device_resume(struct device *dev)
209 {
210         struct acpi_device *acpi_dev = to_acpi_device(dev);
211         struct acpi_driver *acpi_drv = acpi_dev->driver;
212
213         if (acpi_drv && acpi_drv->ops.resume)
214                 return acpi_drv->ops.resume(acpi_dev);
215         return 0;
216 }
217
218 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
219 {
220         struct acpi_device *acpi_dev = to_acpi_device(dev);
221         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
222
223         return !acpi_match_ids(acpi_dev, acpi_drv->ids);
224 }
225
226 static int acpi_device_uevent(struct device *dev, char **envp, int num_envp,
227         char *buffer, int buffer_size)
228 {
229         struct acpi_device *acpi_dev = to_acpi_device(dev);
230         int i = 0, length = 0, ret = 0;
231
232         if (acpi_dev->flags.hardware_id)
233                 ret = add_uevent_var(envp, num_envp, &i,
234                         buffer, buffer_size, &length,
235                         "HWID=%s", acpi_dev->pnp.hardware_id);
236         if (ret)
237                 return -ENOMEM;
238         if (acpi_dev->flags.compatible_ids) {
239                 int j;
240                 struct acpi_compatible_id_list *cid_list;
241
242                 cid_list = acpi_dev->pnp.cid_list;
243
244                 for (j = 0; j < cid_list->count; j++) {
245                         ret = add_uevent_var(envp, num_envp, &i, buffer,
246                                 buffer_size, &length, "COMPTID=%s",
247                                 cid_list->id[j].value);
248                         if (ret)
249                                 return -ENOMEM;
250                 }
251         }
252
253         envp[i] = NULL;
254         return 0;
255 }
256
257 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
258 static int acpi_start_single_object(struct acpi_device *);
259 static int acpi_device_probe(struct device * dev)
260 {
261         struct acpi_device *acpi_dev = to_acpi_device(dev);
262         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
263         int ret;
264
265         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
266         if (!ret) {
267                 if (acpi_dev->bus_ops.acpi_op_start)
268                         acpi_start_single_object(acpi_dev);
269                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
270                         "Found driver [%s] for device [%s]\n",
271                         acpi_drv->name, acpi_dev->pnp.bus_id));
272                 get_device(dev);
273         }
274         return ret;
275 }
276
277 static int acpi_device_remove(struct device * dev)
278 {
279         struct acpi_device *acpi_dev = to_acpi_device(dev);
280         struct acpi_driver *acpi_drv = acpi_dev->driver;
281
282         if (acpi_drv) {
283                 if (acpi_drv->ops.stop)
284                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
285                 if (acpi_drv->ops.remove)
286                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
287         }
288         acpi_dev->driver = NULL;
289         acpi_driver_data(dev) = NULL;
290
291         put_device(dev);
292         return 0;
293 }
294
295 static void acpi_device_shutdown(struct device *dev)
296 {
297         struct acpi_device *acpi_dev = to_acpi_device(dev);
298         struct acpi_driver *acpi_drv = acpi_dev->driver;
299
300         if (acpi_drv && acpi_drv->ops.shutdown)
301                 acpi_drv->ops.shutdown(acpi_dev);
302
303         return ;
304 }
305
306 static struct bus_type acpi_bus_type = {
307         .name           = "acpi",
308         .suspend        = acpi_device_suspend,
309         .resume         = acpi_device_resume,
310         .shutdown       = acpi_device_shutdown,
311         .match          = acpi_bus_match,
312         .probe          = acpi_device_probe,
313         .remove         = acpi_device_remove,
314         .uevent         = acpi_device_uevent,
315 };
316
317 static int acpi_device_register(struct acpi_device *device,
318                                  struct acpi_device *parent)
319 {
320         int result;
321         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
322         int found = 0;
323         /*
324          * Linkage
325          * -------
326          * Link this device to its parent and siblings.
327          */
328         INIT_LIST_HEAD(&device->children);
329         INIT_LIST_HEAD(&device->node);
330         INIT_LIST_HEAD(&device->g_list);
331         INIT_LIST_HEAD(&device->wakeup_list);
332
333         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
334         if (!new_bus_id) {
335                 printk(KERN_ERR PREFIX "Memory allocation error\n");
336                 return -ENOMEM;
337         }
338
339         spin_lock(&acpi_device_lock);
340         /*
341          * Find suitable bus_id and instance number in acpi_bus_id_list
342          * If failed, create one and link it into acpi_bus_id_list
343          */
344         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
345                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
346                         acpi_device_bus_id->instance_no ++;
347                         found = 1;
348                         kfree(new_bus_id);
349                         break;
350                 }
351         }
352         if(!found) {
353                 acpi_device_bus_id = new_bus_id;
354                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
355                 acpi_device_bus_id->instance_no = 0;
356                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
357         }
358         sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
359
360         if (device->parent) {
361                 list_add_tail(&device->node, &device->parent->children);
362                 list_add_tail(&device->g_list, &device->parent->g_list);
363         } else
364                 list_add_tail(&device->g_list, &acpi_device_list);
365         if (device->wakeup.flags.valid)
366                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
367         spin_unlock(&acpi_device_lock);
368
369         if (device->parent)
370                 device->dev.parent = &parent->dev;
371         device->dev.bus = &acpi_bus_type;
372         device_initialize(&device->dev);
373         device->dev.release = &acpi_device_release;
374         result = device_add(&device->dev);
375         if(result) {
376                 printk("Error adding device %s", device->dev.bus_id);
377                 goto end;
378         }
379
380         result = acpi_device_setup_files(device);
381         if(result)
382                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id));
383
384         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
385         return 0;
386   end:
387         spin_lock(&acpi_device_lock);
388         if (device->parent) {
389                 list_del(&device->node);
390                 list_del(&device->g_list);
391         } else
392                 list_del(&device->g_list);
393         list_del(&device->wakeup_list);
394         spin_unlock(&acpi_device_lock);
395         return result;
396 }
397
398 static void acpi_device_unregister(struct acpi_device *device, int type)
399 {
400         spin_lock(&acpi_device_lock);
401         if (device->parent) {
402                 list_del(&device->node);
403                 list_del(&device->g_list);
404         } else
405                 list_del(&device->g_list);
406
407         list_del(&device->wakeup_list);
408         spin_unlock(&acpi_device_lock);
409
410         acpi_detach_data(device->handle, acpi_bus_data_handler);
411
412         acpi_device_remove_files(device);
413         device_unregister(&device->dev);
414 }
415
416 /* --------------------------------------------------------------------------
417                                  Driver Management
418    -------------------------------------------------------------------------- */
419 /**
420  * acpi_bus_driver_init - add a device to a driver
421  * @device: the device to add and initialize
422  * @driver: driver for the device
423  *
424  * Used to initialize a device via its device driver.  Called whenever a 
425  * driver is bound to a device.  Invokes the driver's add() ops.
426  */
427 static int
428 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
429 {
430         int result = 0;
431
432
433         if (!device || !driver)
434                 return -EINVAL;
435
436         if (!driver->ops.add)
437                 return -ENOSYS;
438
439         result = driver->ops.add(device);
440         if (result) {
441                 device->driver = NULL;
442                 acpi_driver_data(device) = NULL;
443                 return result;
444         }
445
446         device->driver = driver;
447
448         /*
449          * TBD - Configuration Management: Assign resources to device based
450          * upon possible configuration and currently allocated resources.
451          */
452
453         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
454                           "Driver successfully bound to device\n"));
455         return 0;
456 }
457
458 static int acpi_start_single_object(struct acpi_device *device)
459 {
460         int result = 0;
461         struct acpi_driver *driver;
462
463
464         if (!(driver = device->driver))
465                 return 0;
466
467         if (driver->ops.start) {
468                 result = driver->ops.start(device);
469                 if (result && driver->ops.remove)
470                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
471         }
472
473         return result;
474 }
475
476 /**
477  * acpi_bus_register_driver - register a driver with the ACPI bus
478  * @driver: driver being registered
479  *
480  * Registers a driver with the ACPI bus.  Searches the namespace for all
481  * devices that match the driver's criteria and binds.  Returns zero for
482  * success or a negative error status for failure.
483  */
484 int acpi_bus_register_driver(struct acpi_driver *driver)
485 {
486         int ret;
487
488         if (acpi_disabled)
489                 return -ENODEV;
490         driver->drv.name = driver->name;
491         driver->drv.bus = &acpi_bus_type;
492         driver->drv.owner = driver->owner;
493
494         ret = driver_register(&driver->drv);
495         return ret;
496 }
497
498 EXPORT_SYMBOL(acpi_bus_register_driver);
499
500 /**
501  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
502  * @driver: driver to unregister
503  *
504  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
505  * devices that match the driver's criteria and unbinds.
506  */
507 void acpi_bus_unregister_driver(struct acpi_driver *driver)
508 {
509         driver_unregister(&driver->drv);
510 }
511
512 EXPORT_SYMBOL(acpi_bus_unregister_driver);
513
514 /* --------------------------------------------------------------------------
515                                  Device Enumeration
516    -------------------------------------------------------------------------- */
517 acpi_status
518 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
519 {
520         acpi_status status;
521         acpi_handle tmp;
522         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
523         union acpi_object *obj;
524
525         status = acpi_get_handle(handle, "_EJD", &tmp);
526         if (ACPI_FAILURE(status))
527                 return status;
528
529         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
530         if (ACPI_SUCCESS(status)) {
531                 obj = buffer.pointer;
532                 status = acpi_get_handle(NULL, obj->string.pointer, ejd);
533                 kfree(buffer.pointer);
534         }
535         return status;
536 }
537 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
538
539 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
540 {
541
542         /* TBD */
543
544         return;
545 }
546
547 int acpi_match_ids(struct acpi_device *device, char *ids)
548 {
549         if (device->flags.hardware_id)
550                 if (strstr(ids, device->pnp.hardware_id))
551                         return 0;
552
553         if (device->flags.compatible_ids) {
554                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
555                 int i;
556
557                 /* compare multiple _CID entries against driver ids */
558                 for (i = 0; i < cid_list->count; i++) {
559                         if (strstr(ids, cid_list->id[i].value))
560                                 return 0;
561                 }
562         }
563         return -ENOENT;
564 }
565
566 static int acpi_bus_get_perf_flags(struct acpi_device *device)
567 {
568         device->performance.state = ACPI_STATE_UNKNOWN;
569         return 0;
570 }
571
572 static acpi_status
573 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
574                                              union acpi_object *package)
575 {
576         int i = 0;
577         union acpi_object *element = NULL;
578
579         if (!device || !package || (package->package.count < 2))
580                 return AE_BAD_PARAMETER;
581
582         element = &(package->package.elements[0]);
583         if (!element)
584                 return AE_BAD_PARAMETER;
585         if (element->type == ACPI_TYPE_PACKAGE) {
586                 if ((element->package.count < 2) ||
587                     (element->package.elements[0].type !=
588                      ACPI_TYPE_LOCAL_REFERENCE)
589                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
590                         return AE_BAD_DATA;
591                 device->wakeup.gpe_device =
592                     element->package.elements[0].reference.handle;
593                 device->wakeup.gpe_number =
594                     (u32) element->package.elements[1].integer.value;
595         } else if (element->type == ACPI_TYPE_INTEGER) {
596                 device->wakeup.gpe_number = element->integer.value;
597         } else
598                 return AE_BAD_DATA;
599
600         element = &(package->package.elements[1]);
601         if (element->type != ACPI_TYPE_INTEGER) {
602                 return AE_BAD_DATA;
603         }
604         device->wakeup.sleep_state = element->integer.value;
605
606         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
607                 return AE_NO_MEMORY;
608         }
609         device->wakeup.resources.count = package->package.count - 2;
610         for (i = 0; i < device->wakeup.resources.count; i++) {
611                 element = &(package->package.elements[i + 2]);
612                 if (element->type != ACPI_TYPE_ANY) {
613                         return AE_BAD_DATA;
614                 }
615
616                 device->wakeup.resources.handles[i] = element->reference.handle;
617         }
618
619         return AE_OK;
620 }
621
622 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
623 {
624         acpi_status status = 0;
625         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
626         union acpi_object *package = NULL;
627
628
629         /* _PRW */
630         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
631         if (ACPI_FAILURE(status)) {
632                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
633                 goto end;
634         }
635
636         package = (union acpi_object *)buffer.pointer;
637         status = acpi_bus_extract_wakeup_device_power_package(device, package);
638         if (ACPI_FAILURE(status)) {
639                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
640                 goto end;
641         }
642
643         kfree(buffer.pointer);
644
645         device->wakeup.flags.valid = 1;
646         /* Power button, Lid switch always enable wakeup */
647         if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E"))
648                 device->wakeup.flags.run_wake = 1;
649
650       end:
651         if (ACPI_FAILURE(status))
652                 device->flags.wake_capable = 0;
653         return 0;
654 }
655
656 static int acpi_bus_get_power_flags(struct acpi_device *device)
657 {
658         acpi_status status = 0;
659         acpi_handle handle = NULL;
660         u32 i = 0;
661
662
663         /*
664          * Power Management Flags
665          */
666         status = acpi_get_handle(device->handle, "_PSC", &handle);
667         if (ACPI_SUCCESS(status))
668                 device->power.flags.explicit_get = 1;
669         status = acpi_get_handle(device->handle, "_IRC", &handle);
670         if (ACPI_SUCCESS(status))
671                 device->power.flags.inrush_current = 1;
672
673         /*
674          * Enumerate supported power management states
675          */
676         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
677                 struct acpi_device_power_state *ps = &device->power.states[i];
678                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
679
680                 /* Evaluate "_PRx" to se if power resources are referenced */
681                 acpi_evaluate_reference(device->handle, object_name, NULL,
682                                         &ps->resources);
683                 if (ps->resources.count) {
684                         device->power.flags.power_resources = 1;
685                         ps->flags.valid = 1;
686                 }
687
688                 /* Evaluate "_PSx" to see if we can do explicit sets */
689                 object_name[2] = 'S';
690                 status = acpi_get_handle(device->handle, object_name, &handle);
691                 if (ACPI_SUCCESS(status)) {
692                         ps->flags.explicit_set = 1;
693                         ps->flags.valid = 1;
694                 }
695
696                 /* State is valid if we have some power control */
697                 if (ps->resources.count || ps->flags.explicit_set)
698                         ps->flags.valid = 1;
699
700                 ps->power = -1; /* Unknown - driver assigned */
701                 ps->latency = -1;       /* Unknown - driver assigned */
702         }
703
704         /* Set defaults for D0 and D3 states (always valid) */
705         device->power.states[ACPI_STATE_D0].flags.valid = 1;
706         device->power.states[ACPI_STATE_D0].power = 100;
707         device->power.states[ACPI_STATE_D3].flags.valid = 1;
708         device->power.states[ACPI_STATE_D3].power = 0;
709
710         /* TBD: System wake support and resource requirements. */
711
712         device->power.state = ACPI_STATE_UNKNOWN;
713
714         return 0;
715 }
716
717 static int acpi_bus_get_flags(struct acpi_device *device)
718 {
719         acpi_status status = AE_OK;
720         acpi_handle temp = NULL;
721
722
723         /* Presence of _STA indicates 'dynamic_status' */
724         status = acpi_get_handle(device->handle, "_STA", &temp);
725         if (ACPI_SUCCESS(status))
726                 device->flags.dynamic_status = 1;
727
728         /* Presence of _CID indicates 'compatible_ids' */
729         status = acpi_get_handle(device->handle, "_CID", &temp);
730         if (ACPI_SUCCESS(status))
731                 device->flags.compatible_ids = 1;
732
733         /* Presence of _RMV indicates 'removable' */
734         status = acpi_get_handle(device->handle, "_RMV", &temp);
735         if (ACPI_SUCCESS(status))
736                 device->flags.removable = 1;
737
738         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
739         status = acpi_get_handle(device->handle, "_EJD", &temp);
740         if (ACPI_SUCCESS(status))
741                 device->flags.ejectable = 1;
742         else {
743                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
744                 if (ACPI_SUCCESS(status))
745                         device->flags.ejectable = 1;
746         }
747
748         /* Presence of _LCK indicates 'lockable' */
749         status = acpi_get_handle(device->handle, "_LCK", &temp);
750         if (ACPI_SUCCESS(status))
751                 device->flags.lockable = 1;
752
753         /* Presence of _PS0|_PR0 indicates 'power manageable' */
754         status = acpi_get_handle(device->handle, "_PS0", &temp);
755         if (ACPI_FAILURE(status))
756                 status = acpi_get_handle(device->handle, "_PR0", &temp);
757         if (ACPI_SUCCESS(status))
758                 device->flags.power_manageable = 1;
759
760         /* Presence of _PRW indicates wake capable */
761         status = acpi_get_handle(device->handle, "_PRW", &temp);
762         if (ACPI_SUCCESS(status))
763                 device->flags.wake_capable = 1;
764
765         /* TBD: Peformance management */
766
767         return 0;
768 }
769
770 static void acpi_device_get_busid(struct acpi_device *device,
771                                   acpi_handle handle, int type)
772 {
773         char bus_id[5] = { '?', 0 };
774         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
775         int i = 0;
776
777         /*
778          * Bus ID
779          * ------
780          * The device's Bus ID is simply the object name.
781          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
782          */
783         switch (type) {
784         case ACPI_BUS_TYPE_SYSTEM:
785                 strcpy(device->pnp.bus_id, "ACPI");
786                 break;
787         case ACPI_BUS_TYPE_POWER_BUTTON:
788                 strcpy(device->pnp.bus_id, "PWRF");
789                 break;
790         case ACPI_BUS_TYPE_SLEEP_BUTTON:
791                 strcpy(device->pnp.bus_id, "SLPF");
792                 break;
793         default:
794                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
795                 /* Clean up trailing underscores (if any) */
796                 for (i = 3; i > 1; i--) {
797                         if (bus_id[i] == '_')
798                                 bus_id[i] = '\0';
799                         else
800                                 break;
801                 }
802                 strcpy(device->pnp.bus_id, bus_id);
803                 break;
804         }
805 }
806
807 static int
808 acpi_video_bus_match(struct acpi_device *device)
809 {
810         acpi_handle h_dummy1;
811         acpi_handle h_dummy2;
812         acpi_handle h_dummy3;
813
814
815         if (!device)
816                 return -EINVAL;
817
818         /* Since there is no HID, CID for ACPI Video drivers, we have
819          * to check well known required nodes for each feature we support.
820          */
821
822         /* Does this device able to support video switching ? */
823         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
824             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
825                 return 0;
826
827         /* Does this device able to retrieve a video ROM ? */
828         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
829                 return 0;
830
831         /* Does this device able to configure which video head to be POSTed ? */
832         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
833             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
834             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
835                 return 0;
836
837         return -ENODEV;
838 }
839
840 /*
841  * acpi_bay_match - see if a device is an ejectable driver bay
842  *
843  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
844  * then we can safely call it an ejectable drive bay
845  */
846 static int acpi_bay_match(struct acpi_device *device){
847         acpi_status status;
848         acpi_handle handle;
849         acpi_handle tmp;
850         acpi_handle phandle;
851
852         handle = device->handle;
853
854         status = acpi_get_handle(handle, "_EJ0", &tmp);
855         if (ACPI_FAILURE(status))
856                 return -ENODEV;
857
858         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
859                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
860                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
861                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
862                 return 0;
863
864         if (acpi_get_parent(handle, &phandle))
865                 return -ENODEV;
866
867         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
868                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
869                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
870                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
871                 return 0;
872
873         return -ENODEV;
874 }
875
876 static void acpi_device_set_id(struct acpi_device *device,
877                                struct acpi_device *parent, acpi_handle handle,
878                                int type)
879 {
880         struct acpi_device_info *info;
881         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
882         char *hid = NULL;
883         char *uid = NULL;
884         struct acpi_compatible_id_list *cid_list = NULL;
885         acpi_status status;
886
887         switch (type) {
888         case ACPI_BUS_TYPE_DEVICE:
889                 status = acpi_get_object_info(handle, &buffer);
890                 if (ACPI_FAILURE(status)) {
891                         printk("%s: Error reading device info\n", __FUNCTION__);
892                         return;
893                 }
894
895                 info = buffer.pointer;
896                 if (info->valid & ACPI_VALID_HID)
897                         hid = info->hardware_id.value;
898                 if (info->valid & ACPI_VALID_UID)
899                         uid = info->unique_id.value;
900                 if (info->valid & ACPI_VALID_CID)
901                         cid_list = &info->compatibility_id;
902                 if (info->valid & ACPI_VALID_ADR) {
903                         device->pnp.bus_address = info->address;
904                         device->flags.bus_address = 1;
905                 }
906
907                 if(!(info->valid & (ACPI_VALID_HID | ACPI_VALID_CID))){
908                         status = acpi_video_bus_match(device);
909                         if(ACPI_SUCCESS(status))
910                                 hid = ACPI_VIDEO_HID;
911
912                         status = acpi_bay_match(device);
913                         if (ACPI_SUCCESS(status))
914                                 hid = ACPI_BAY_HID;
915                 }
916                 break;
917         case ACPI_BUS_TYPE_POWER:
918                 hid = ACPI_POWER_HID;
919                 break;
920         case ACPI_BUS_TYPE_PROCESSOR:
921                 hid = ACPI_PROCESSOR_HID;
922                 break;
923         case ACPI_BUS_TYPE_SYSTEM:
924                 hid = ACPI_SYSTEM_HID;
925                 break;
926         case ACPI_BUS_TYPE_THERMAL:
927                 hid = ACPI_THERMAL_HID;
928                 break;
929         case ACPI_BUS_TYPE_POWER_BUTTON:
930                 hid = ACPI_BUTTON_HID_POWERF;
931                 break;
932         case ACPI_BUS_TYPE_SLEEP_BUTTON:
933                 hid = ACPI_BUTTON_HID_SLEEPF;
934                 break;
935         }
936
937         /* 
938          * \_SB
939          * ----
940          * Fix for the system root bus device -- the only root-level device.
941          */
942         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
943                 hid = ACPI_BUS_HID;
944                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
945                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
946         }
947
948         if (hid) {
949                 strcpy(device->pnp.hardware_id, hid);
950                 device->flags.hardware_id = 1;
951         }
952         if (uid) {
953                 strcpy(device->pnp.unique_id, uid);
954                 device->flags.unique_id = 1;
955         }
956         if (cid_list) {
957                 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
958                 if (device->pnp.cid_list)
959                         memcpy(device->pnp.cid_list, cid_list, cid_list->size);
960                 else
961                         printk(KERN_ERR "Memory allocation error\n");
962         }
963
964         kfree(buffer.pointer);
965 }
966
967 static int acpi_device_set_context(struct acpi_device *device, int type)
968 {
969         acpi_status status = AE_OK;
970         int result = 0;
971         /*
972          * Context
973          * -------
974          * Attach this 'struct acpi_device' to the ACPI object.  This makes
975          * resolutions from handle->device very efficient.  Note that we need
976          * to be careful with fixed-feature devices as they all attach to the
977          * root object.
978          */
979         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
980             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
981                 status = acpi_attach_data(device->handle,
982                                           acpi_bus_data_handler, device);
983
984                 if (ACPI_FAILURE(status)) {
985                         printk("Error attaching device data\n");
986                         result = -ENODEV;
987                 }
988         }
989         return result;
990 }
991
992 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
993 {
994         if (!dev)
995                 return -EINVAL;
996
997         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
998         device_release_driver(&dev->dev);
999
1000         if (!rmdevice)
1001                 return 0;
1002
1003         /*
1004          * unbind _ADR-Based Devices when hot removal
1005          */
1006         if (dev->flags.bus_address) {
1007                 if ((dev->parent) && (dev->parent->ops.unbind))
1008                         dev->parent->ops.unbind(dev);
1009         }
1010         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1011
1012         return 0;
1013 }
1014
1015 static int
1016 acpi_add_single_object(struct acpi_device **child,
1017                        struct acpi_device *parent, acpi_handle handle, int type,
1018                         struct acpi_bus_ops *ops)
1019 {
1020         int result = 0;
1021         struct acpi_device *device = NULL;
1022
1023
1024         if (!child)
1025                 return -EINVAL;
1026
1027         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1028         if (!device) {
1029                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1030                 return -ENOMEM;
1031         }
1032
1033         device->handle = handle;
1034         device->parent = parent;
1035         device->bus_ops = *ops; /* workround for not call .start */
1036
1037
1038         acpi_device_get_busid(device, handle, type);
1039
1040         /*
1041          * Flags
1042          * -----
1043          * Get prior to calling acpi_bus_get_status() so we know whether
1044          * or not _STA is present.  Note that we only look for object
1045          * handles -- cannot evaluate objects until we know the device is
1046          * present and properly initialized.
1047          */
1048         result = acpi_bus_get_flags(device);
1049         if (result)
1050                 goto end;
1051
1052         /*
1053          * Status
1054          * ------
1055          * See if the device is present.  We always assume that non-Device
1056          * and non-Processor objects (e.g. thermal zones, power resources,
1057          * etc.) are present, functioning, etc. (at least when parent object
1058          * is present).  Note that _STA has a different meaning for some
1059          * objects (e.g. power resources) so we need to be careful how we use
1060          * it.
1061          */
1062         switch (type) {
1063         case ACPI_BUS_TYPE_PROCESSOR:
1064         case ACPI_BUS_TYPE_DEVICE:
1065                 result = acpi_bus_get_status(device);
1066                 if (ACPI_FAILURE(result) || !device->status.present) {
1067                         result = -ENOENT;
1068                         goto end;
1069                 }
1070                 break;
1071         default:
1072                 STRUCT_TO_INT(device->status) = 0x0F;
1073                 break;
1074         }
1075
1076         /*
1077          * Initialize Device
1078          * -----------------
1079          * TBD: Synch with Core's enumeration/initialization process.
1080          */
1081
1082         /*
1083          * Hardware ID, Unique ID, & Bus Address
1084          * -------------------------------------
1085          */
1086         acpi_device_set_id(device, parent, handle, type);
1087
1088         /*
1089          * Power Management
1090          * ----------------
1091          */
1092         if (device->flags.power_manageable) {
1093                 result = acpi_bus_get_power_flags(device);
1094                 if (result)
1095                         goto end;
1096         }
1097
1098         /*
1099          * Wakeup device management
1100          *-----------------------
1101          */
1102         if (device->flags.wake_capable) {
1103                 result = acpi_bus_get_wakeup_device_flags(device);
1104                 if (result)
1105                         goto end;
1106         }
1107
1108         /*
1109          * Performance Management
1110          * ----------------------
1111          */
1112         if (device->flags.performance_manageable) {
1113                 result = acpi_bus_get_perf_flags(device);
1114                 if (result)
1115                         goto end;
1116         }
1117
1118         if ((result = acpi_device_set_context(device, type)))
1119                 goto end;
1120
1121         result = acpi_device_register(device, parent);
1122
1123         /*
1124          * Bind _ADR-Based Devices when hot add
1125          */
1126         if (device->flags.bus_address) {
1127                 if (device->parent && device->parent->ops.bind)
1128                         device->parent->ops.bind(device);
1129         }
1130
1131       end:
1132         if (!result)
1133                 *child = device;
1134         else {
1135                 kfree(device->pnp.cid_list);
1136                 kfree(device);
1137         }
1138
1139         return result;
1140 }
1141
1142 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1143 {
1144         acpi_status status = AE_OK;
1145         struct acpi_device *parent = NULL;
1146         struct acpi_device *child = NULL;
1147         acpi_handle phandle = NULL;
1148         acpi_handle chandle = NULL;
1149         acpi_object_type type = 0;
1150         u32 level = 1;
1151
1152
1153         if (!start)
1154                 return -EINVAL;
1155
1156         parent = start;
1157         phandle = start->handle;
1158
1159         /*
1160          * Parse through the ACPI namespace, identify all 'devices', and
1161          * create a new 'struct acpi_device' for each.
1162          */
1163         while ((level > 0) && parent) {
1164
1165                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1166                                               chandle, &chandle);
1167
1168                 /*
1169                  * If this scope is exhausted then move our way back up.
1170                  */
1171                 if (ACPI_FAILURE(status)) {
1172                         level--;
1173                         chandle = phandle;
1174                         acpi_get_parent(phandle, &phandle);
1175                         if (parent->parent)
1176                                 parent = parent->parent;
1177                         continue;
1178                 }
1179
1180                 status = acpi_get_type(chandle, &type);
1181                 if (ACPI_FAILURE(status))
1182                         continue;
1183
1184                 /*
1185                  * If this is a scope object then parse it (depth-first).
1186                  */
1187                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1188                         level++;
1189                         phandle = chandle;
1190                         chandle = NULL;
1191                         continue;
1192                 }
1193
1194                 /*
1195                  * We're only interested in objects that we consider 'devices'.
1196                  */
1197                 switch (type) {
1198                 case ACPI_TYPE_DEVICE:
1199                         type = ACPI_BUS_TYPE_DEVICE;
1200                         break;
1201                 case ACPI_TYPE_PROCESSOR:
1202                         type = ACPI_BUS_TYPE_PROCESSOR;
1203                         break;
1204                 case ACPI_TYPE_THERMAL:
1205                         type = ACPI_BUS_TYPE_THERMAL;
1206                         break;
1207                 case ACPI_TYPE_POWER:
1208                         type = ACPI_BUS_TYPE_POWER;
1209                         break;
1210                 default:
1211                         continue;
1212                 }
1213
1214                 if (ops->acpi_op_add)
1215                         status = acpi_add_single_object(&child, parent,
1216                                 chandle, type, ops);
1217                 else
1218                         status = acpi_bus_get_device(chandle, &child);
1219
1220                 if (ACPI_FAILURE(status))
1221                         continue;
1222
1223                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1224                         status = acpi_start_single_object(child);
1225                         if (ACPI_FAILURE(status))
1226                                 continue;
1227                 }
1228
1229                 /*
1230                  * If the device is present, enabled, and functioning then
1231                  * parse its scope (depth-first).  Note that we need to
1232                  * represent absent devices to facilitate PnP notifications
1233                  * -- but only the subtree head (not all of its children,
1234                  * which will be enumerated when the parent is inserted).
1235                  *
1236                  * TBD: Need notifications and other detection mechanisms
1237                  *      in place before we can fully implement this.
1238                  */
1239                 if (child->status.present) {
1240                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1241                                                       NULL, NULL);
1242                         if (ACPI_SUCCESS(status)) {
1243                                 level++;
1244                                 phandle = chandle;
1245                                 chandle = NULL;
1246                                 parent = child;
1247                         }
1248                 }
1249         }
1250
1251         return 0;
1252 }
1253
1254 int
1255 acpi_bus_add(struct acpi_device **child,
1256              struct acpi_device *parent, acpi_handle handle, int type)
1257 {
1258         int result;
1259         struct acpi_bus_ops ops;
1260
1261         memset(&ops, 0, sizeof(ops));
1262         ops.acpi_op_add = 1;
1263
1264         result = acpi_add_single_object(child, parent, handle, type, &ops);
1265         if (!result)
1266                 result = acpi_bus_scan(*child, &ops);
1267
1268         return result;
1269 }
1270
1271 EXPORT_SYMBOL(acpi_bus_add);
1272
1273 int acpi_bus_start(struct acpi_device *device)
1274 {
1275         int result;
1276         struct acpi_bus_ops ops;
1277
1278
1279         if (!device)
1280                 return -EINVAL;
1281
1282         result = acpi_start_single_object(device);
1283         if (!result) {
1284                 memset(&ops, 0, sizeof(ops));
1285                 ops.acpi_op_start = 1;
1286                 result = acpi_bus_scan(device, &ops);
1287         }
1288         return result;
1289 }
1290
1291 EXPORT_SYMBOL(acpi_bus_start);
1292
1293 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1294 {
1295         acpi_status status;
1296         struct acpi_device *parent, *child;
1297         acpi_handle phandle, chandle;
1298         acpi_object_type type;
1299         u32 level = 1;
1300         int err = 0;
1301
1302         parent = start;
1303         phandle = start->handle;
1304         child = chandle = NULL;
1305
1306         while ((level > 0) && parent && (!err)) {
1307                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1308                                               chandle, &chandle);
1309
1310                 /*
1311                  * If this scope is exhausted then move our way back up.
1312                  */
1313                 if (ACPI_FAILURE(status)) {
1314                         level--;
1315                         chandle = phandle;
1316                         acpi_get_parent(phandle, &phandle);
1317                         child = parent;
1318                         parent = parent->parent;
1319
1320                         if (level == 0)
1321                                 err = acpi_bus_remove(child, rmdevice);
1322                         else
1323                                 err = acpi_bus_remove(child, 1);
1324
1325                         continue;
1326                 }
1327
1328                 status = acpi_get_type(chandle, &type);
1329                 if (ACPI_FAILURE(status)) {
1330                         continue;
1331                 }
1332                 /*
1333                  * If there is a device corresponding to chandle then
1334                  * parse it (depth-first).
1335                  */
1336                 if (acpi_bus_get_device(chandle, &child) == 0) {
1337                         level++;
1338                         phandle = chandle;
1339                         chandle = NULL;
1340                         parent = child;
1341                 }
1342                 continue;
1343         }
1344         return err;
1345 }
1346 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1347
1348
1349 static int acpi_bus_scan_fixed(struct acpi_device *root)
1350 {
1351         int result = 0;
1352         struct acpi_device *device = NULL;
1353         struct acpi_bus_ops ops;
1354
1355         if (!root)
1356                 return -ENODEV;
1357
1358         memset(&ops, 0, sizeof(ops));
1359         ops.acpi_op_add = 1;
1360         ops.acpi_op_start = 1;
1361
1362         /*
1363          * Enumerate all fixed-feature devices.
1364          */
1365         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1366                 result = acpi_add_single_object(&device, acpi_root,
1367                                                 NULL,
1368                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1369                                                 &ops);
1370         }
1371
1372         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1373                 result = acpi_add_single_object(&device, acpi_root,
1374                                                 NULL,
1375                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1376                                                 &ops);
1377         }
1378
1379         return result;
1380 }
1381
1382 static int __init acpi_scan_init(void)
1383 {
1384         int result;
1385         struct acpi_bus_ops ops;
1386
1387
1388         if (acpi_disabled)
1389                 return 0;
1390
1391         memset(&ops, 0, sizeof(ops));
1392         ops.acpi_op_add = 1;
1393         ops.acpi_op_start = 1;
1394
1395         result = bus_register(&acpi_bus_type);
1396         if (result) {
1397                 /* We don't want to quit even if we failed to add suspend/resume */
1398                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1399         }
1400
1401         /*
1402          * Create the root device in the bus's device tree
1403          */
1404         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1405                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1406         if (result)
1407                 goto Done;
1408
1409         /*
1410          * Enumerate devices in the ACPI namespace.
1411          */
1412         result = acpi_bus_scan_fixed(acpi_root);
1413         if (!result)
1414                 result = acpi_bus_scan(acpi_root, &ops);
1415
1416         if (result)
1417                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1418
1419       Done:
1420         return result;
1421 }
1422
1423 subsys_initcall(acpi_scan_init);