1 /*
2 * scan.c - support for transforming the ACPI namespace into individual objects
3 */
4
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/acpi.h>
8
9 #include <acpi/acpi_drivers.h>
10 #include <acpi/acinterp.h> /* for acpi_ex_eisa_id_to_string() */
11
12
13 #define _COMPONENT ACPI_BUS_COMPONENT
14 ACPI_MODULE_NAME ("scan")
15
16 #define STRUCT_TO_INT(s) (*((int*)&s))
17
18 extern struct acpi_device *acpi_root;
19
20
21 #define ACPI_BUS_CLASS "system_bus"
22 #define ACPI_BUS_HID "ACPI_BUS"
23 #define ACPI_BUS_DRIVER_NAME "ACPI Bus Driver"
24 #define ACPI_BUS_DEVICE_NAME "System Bus"
25
26 static LIST_HEAD(acpi_device_list);
27 DEFINE_SPINLOCK(acpi_device_lock);
28 LIST_HEAD(acpi_wakeup_device_list);
29
30 static void acpi_device_release(struct kobject * kobj)
31 {
32 struct acpi_device * dev = container_of(kobj,struct acpi_device,kobj);
33 if (dev->pnp.cid_list)
34 kfree(dev->pnp.cid_list);
35 kfree(dev);
36 }
37
38 struct acpi_device_attribute {
39 struct attribute attr;
40 ssize_t (*show)(struct acpi_device *, char *);
41 ssize_t (*store)(struct acpi_device *, const char *, size_t);
42 };
43
44 typedef void acpi_device_sysfs_files(struct kobject *,
45 const struct attribute *);
46
47 static void setup_sys_fs_device_files(struct acpi_device *dev,
48 acpi_device_sysfs_files *func);
49
50 #define create_sysfs_device_files(dev) \
51 setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file)
52 #define remove_sysfs_device_files(dev) \
53 setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file)
54
55
56 #define to_acpi_device(n) container_of(n, struct acpi_device, kobj)
57 #define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr);
58
59 static ssize_t acpi_device_attr_show(struct kobject *kobj,
60 struct attribute *attr, char *buf)
61 {
62 struct acpi_device *device = to_acpi_device(kobj);
63 struct acpi_device_attribute *attribute = to_handle_attr(attr);
64 return attribute->show ? attribute->show(device, buf) : 0;
65 }
66 static ssize_t acpi_device_attr_store(struct kobject *kobj,
67 struct attribute *attr, const char *buf, size_t len)
68 {
69 struct acpi_device *device = to_acpi_device(kobj);
70 struct acpi_device_attribute *attribute = to_handle_attr(attr);
71 return attribute->store ? attribute->store(device, buf, len) : len;
72 }
73
74 static struct sysfs_ops acpi_device_sysfs_ops = {
75 .show = acpi_device_attr_show,
76 .store = acpi_device_attr_store,
77 };
78
79 static struct kobj_type ktype_acpi_ns = {
80 .sysfs_ops = &acpi_device_sysfs_ops,
81 .release = acpi_device_release,
82 };
83
84 static struct kset acpi_namespace_kset = {
85 .kobj = {
86 .name = "namespace",
87 },
88 .subsys = &acpi_subsys,
89 .ktype = &ktype_acpi_ns,
90 };
91
92
93 static void acpi_device_register(struct acpi_device * device, struct acpi_device * parent)
94 {
95 /*
96 * Linkage
97 * -------
98 * Link this device to its parent and siblings.
99 */
100 INIT_LIST_HEAD(&device->children);
101 INIT_LIST_HEAD(&device->node);
102 INIT_LIST_HEAD(&device->g_list);
103 INIT_LIST_HEAD(&device->wakeup_list);
104
105 spin_lock(&acpi_device_lock);
106 if (device->parent) {
107 list_add_tail(&device->node, &device->parent->children);
108 list_add_tail(&device->g_list,&device->parent->g_list);
109 } else
110 list_add_tail(&device->g_list,&acpi_device_list);
111 if (device->wakeup.flags.valid)
112 list_add_tail(&device->wakeup_list,&acpi_wakeup_device_list);
113 spin_unlock(&acpi_device_lock);
114
115 strlcpy(device->kobj.name,device->pnp.bus_id,KOBJ_NAME_LEN);
116 if (parent)
117 device->kobj.parent = &parent->kobj;
118 device->kobj.ktype = &ktype_acpi_ns;
119 device->kobj.kset = &acpi_namespace_kset;
120 kobject_register(&device->kobj);
121 create_sysfs_device_files(device);
122 }
123
124 static int
125 acpi_device_unregister (
126 struct acpi_device *device,
127 int type)
128 {
129 spin_lock(&acpi_device_lock);
130 if (device->parent) {
131 list_del(&device->node);
132 list_del(&device->g_list);
133 } else
134 list_del(&device->g_list);
135
136 list_del(&device->wakeup_list);
137
138 spin_unlock(&acpi_device_lock);
139
140 acpi_detach_data(device->handle, acpi_bus_data_handler);
141 remove_sysfs_device_files(device);
142 kobject_unregister(&device->kobj);
143 return 0;
144 }
145
146 void
147 acpi_bus_data_handler (
148 acpi_handle handle,
149 u32 function,
150 void *context)
151 {
152 ACPI_FUNCTION_TRACE("acpi_bus_data_handler");
153
154 /* TBD */
155
156 return_VOID;
157 }
158
159 static int
160 acpi_bus_get_power_flags (
161 struct acpi_device *device)
162 {
163 acpi_status status = 0;
164 acpi_handle handle = NULL;
165 u32 i = 0;
166
167 ACPI_FUNCTION_TRACE("acpi_bus_get_power_flags");
168
169 /*
170 * Power Management Flags
171 */
172 status = acpi_get_handle(device->handle, "_PSC", &handle);
173 if (ACPI_SUCCESS(status))
174 device->power.flags.explicit_get = 1;
175 status = acpi_get_handle(device->handle, "_IRC", &handle);
176 if (ACPI_SUCCESS(status))
177 device->power.flags.inrush_current = 1;
178
179 /*
180 * Enumerate supported power management states
181 */
182 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
183 struct acpi_device_power_state *ps = &device->power.states[i];
184 char object_name[5] = {'_','P','R',''+i,'\0'};
185
186 /* Evaluate "_PRx" to se if power resources are referenced */
187 acpi_evaluate_reference(device->handle, object_name, NULL,
188 &ps->resources);
189 if (ps->resources.count) {
190 device->power.flags.power_resources = 1;
191 ps->flags.valid = 1;
192 }
193
194 /* Evaluate "_PSx" to see if we can do explicit sets */
195 object_name[2] = 'S';
196 status = acpi_get_handle(device->handle, object_name, &handle);
197 if (ACPI_SUCCESS(status)) {
198 ps->flags.explicit_set = 1;
199 ps->flags.valid = 1;
200 }
201
202 /* State is valid if we have some power control */
203 if (ps->resources.count || ps->flags.explicit_set)
204 ps->flags.valid = 1;
205
206 ps->power = -1; /* Unknown - driver assigned */
207 ps->latency = -1; /* Unknown - driver assigned */
208 }
209
210 /* Set defaults for D0 and D3 states (always valid) */
211 device->power.states[ACPI_STATE_D0].flags.valid = 1;
212 device->power.states[ACPI_STATE_D0].power = 100;
213 device->power.states[ACPI_STATE_D3].flags.valid = 1;
214 device->power.states[ACPI_STATE_D3].power = 0;
215
216 /* TBD: System wake support and resource requirements. */
217
218 device->power.state = ACPI_STATE_UNKNOWN;
219
220 return_VALUE(0);
221 }
222
223 int
224 acpi_match_ids (
225 struct acpi_device *device,
226 char *ids)
227 {
228 int error = 0;
229 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
230
231 if (device->flags.hardware_id)
232 if (strstr(ids, device->pnp.hardware_id))
233 goto Done;
234
235 if (device->flags.compatible_ids) {
236 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
237 int i;
238
239 /* compare multiple _CID entries against driver ids */
240 for (i = 0; i < cid_list->count; i++)
241 {
242 if (strstr(ids, cid_list->id[i].value))
243 goto Done;
244 }
245 }
246 error = -ENOENT;
247
248 Done:
249 if (buffer.pointer)
250 acpi_os_free(buffer.pointer);
251 return error;
252 }
253
254 static acpi_status
255 acpi_bus_extract_wakeup_device_power_package (
256 struct acpi_device *device,
257 union acpi_object *package)
258 {
259 int i = 0;
260 union acpi_object *element = NULL;
261
262 if (!device || !package || (package->package.count < 2))
263 return AE_BAD_PARAMETER;
264
265 element = &(package->package.elements[0]);
266 if (!element)
267 return AE_BAD_PARAMETER;
268 if (element->type == ACPI_TYPE_PACKAGE) {
269 if ((element->package.count < 2) ||
270 (element->package.elements[0].type != ACPI_TYPE_LOCAL_REFERENCE) ||
271 (element->package.elements[1].type != ACPI_TYPE_INTEGER))
272 return AE_BAD_DATA;
273 device->wakeup.gpe_device = element->package.elements[0].reference.handle;
274 device->wakeup.gpe_number = (u32)element->package.elements[1].integer.value;
275 }else if (element->type == ACPI_TYPE_INTEGER) {
276 device->wakeup.gpe_number = element->integer.value;
277 }else
278 return AE_BAD_DATA;
279
280 element = &(package->package.elements[1]);
281 if (element->type != ACPI_TYPE_INTEGER) {
282 return AE_BAD_DATA;
283 }
284 device->wakeup.sleep_state = element->integer.value;
285
286 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
287 return AE_NO_MEMORY;
288 }
289 device->wakeup.resources.count = package->package.count - 2;
290 for (i=0; i < device->wakeup.resources.count; i++) {
291 element = &(package->package.elements[i + 2]);
292 if (element->type != ACPI_TYPE_ANY ) {
293 return AE_BAD_DATA;
294 }
295
296 device->wakeup.resources.handles[i] = element->reference.handle;
297 }
298
299 return AE_OK;
300 }
301
302 static int
303 acpi_bus_get_wakeup_device_flags (
304 struct acpi_device *device)
305 {
306 acpi_status status = 0;
307 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
308 union acpi_object *package = NULL;
309
310 ACPI_FUNCTION_TRACE("acpi_bus_get_wakeup_flags");
311
312 /* _PRW */
313 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
314 if (ACPI_FAILURE(status)) {
315 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRW\n"));
316 goto end;
317 }
318
319 package = (union acpi_object *) buffer.pointer;
320 status = acpi_bus_extract_wakeup_device_power_package(device, package);
321 if (ACPI_FAILURE(status)) {
322 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error extracting _PRW package\n"));
323 goto end;
324 }
325
326 acpi_os_free(buffer.pointer);
327
328 device->wakeup.flags.valid = 1;
329 /* Power button, Lid switch always enable wakeup*/
330 if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E"))
331 device->wakeup.flags.run_wake = 1;
332
333 end:
334 if (ACPI_FAILURE(status))
335 device->flags.wake_capable = 0;
336 return_VALUE(0);
337 }
338
339 /* --------------------------------------------------------------------------
340 ACPI hotplug sysfs device file support
341 -------------------------------------------------------------------------- */
342 static ssize_t acpi_eject_store(struct acpi_device *device,
343 const char *buf, size_t count);
344
345 #define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \
346 static struct acpi_device_attribute acpi_device_attr_##_name = \
347 __ATTR(_name, _mode, _show, _store)
348
349 ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
350
351 /**
352 * setup_sys_fs_device_files - sets up the device files under device namespace
353 * @@dev: acpi_device object
354 * @@func: function pointer to create or destroy the device file
355 */
356 static void
357 setup_sys_fs_device_files (
358 struct acpi_device *dev,
359 acpi_device_sysfs_files *func)
360 {
361 if (dev->flags.ejectable == 1)
362 (*(func))(&dev->kobj,&acpi_device_attr_eject.attr);
363 }
364
365 static int
366 acpi_eject_operation(acpi_handle handle, int lockable)
367 {
368 struct acpi_object_list arg_list;
369 union acpi_object arg;
370 acpi_status status = AE_OK;
371
372 /*
373 * TBD: evaluate _PS3?
374 */
375
376 if (lockable) {
377 arg_list.count = 1;
378 arg_list.pointer = &arg;
379 arg.type = ACPI_TYPE_INTEGER;
380 arg.integer.value = 0;
381 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
382 }
383
384 arg_list.count = 1;
385 arg_list.pointer = &arg;
386 arg.type = ACPI_TYPE_INTEGER;
387 arg.integer.value = 1;
388
389 /*
390 * TBD: _EJD support.
391 */
392
393 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
394 if (ACPI_FAILURE(status)) {
395 return(-ENODEV);
396 }
397
398 return(0);
399 }
400
401
402 static ssize_t
403 acpi_eject_store(struct acpi_device *device, const char *buf, size_t count)
404 {
405 int result;
406 int ret = count;
407 int islockable;
408 acpi_status status;
409 acpi_handle handle;
410 acpi_object_type type = 0;
411
412 if ((!count) || (buf[0] != '1')) {
413 return -EINVAL;
414 }
415
416 #ifndef FORCE_EJECT
417 if (device->driver == NULL) {
418 ret = -ENODEV;
419 goto err;
420 }
421 #endif
422 status = acpi_get_type(device->handle, &type);
423 if (ACPI_FAILURE(status) || (!device->flags.ejectable) ) {
424 ret = -ENODEV;
425 goto err;
426 }
427
428 islockable = device->flags.lockable;
429 handle = device->handle;
430
431 if (type == ACPI_TYPE_PROCESSOR)
432 result = acpi_bus_trim(device, 0);
433 else
434 result = acpi_bus_trim(device, 1);
435
436 if (!result)
437 result = acpi_eject_operation(handle, islockable);
438
439 if (result) {
440 ret = -EBUSY;
441 }
442 err:
443 return ret;
444 }
445
446
447 /* --------------------------------------------------------------------------
448 Performance Management
449 -------------------------------------------------------------------------- */
450
451 static int
452 acpi_bus_get_perf_flags (
453 struct acpi_device *device)
454 {
455 device->performance.state = ACPI_STATE_UNKNOWN;
456 return 0;
457 }
458
459 /* --------------------------------------------------------------------------
460 Driver Management
461 -------------------------------------------------------------------------- */
462
463 static LIST_HEAD(acpi_bus_drivers);
464 static DECLARE_MUTEX(acpi_bus_drivers_lock);
465
466
467 /**
468 * acpi_bus_match
469 * --------------
470 * Checks the device's hardware (_HID) or compatible (_CID) ids to see if it
471 * matches the specified driver's criteria.
472 */
473 static int
474 acpi_bus_match (
475 struct acpi_device *device,
476 struct acpi_driver *driver)
477 {
478 if (driver && driver->ops.match)
479 return driver->ops.match(device, driver);
480 return acpi_match_ids(device, driver->ids);
481 }
482
483
484 /**
485 * acpi_bus_driver_init
486 * --------------------
487 * Used to initialize a device via its device driver. Called whenever a
488 * driver is bound to a device. Invokes the driver's add() and start() ops.
489 */
490 static int
491 acpi_bus_driver_init (
492 struct acpi_device *device,
493 struct acpi_driver *driver)
494 {
495 int result = 0;
496
497 ACPI_FUNCTION_TRACE("acpi_bus_driver_init");
498
499 if (!device || !driver)
500 return_VALUE(-EINVAL);
501
502 if (!driver->ops.add)
503 return_VALUE(-ENOSYS);
504
505 result = driver->ops.add(device);
506 if (result) {
507 device->driver = NULL;
508 acpi_driver_data(device) = NULL;
509 return_VALUE(result);
510 }
511
512 device->driver = driver;
513
514 /*
515 * TBD - Configuration Management: Assign resources to device based
516 * upon possible configuration and currently allocated resources.
517 */
518
519 if (driver->ops.start) {
520 result = driver->ops.start(device);
521 if (result && driver->ops.remove)
522 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
523 return_VALUE(result);
524 }
525
526 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Driver successfully bound to device\n"));
527
528 if (driver->ops.scan) {
529 driver->ops.scan(device);
530 }
531
532 return_VALUE(0);
533 }
534
535 static int acpi_driver_attach(struct acpi_driver * drv)
536 {
537 struct list_head * node, * next;
538 int count = 0;
539
540 ACPI_FUNCTION_TRACE("acpi_driver_attach");
541
542 spin_lock(&acpi_device_lock);
543 list_for_each_safe(node, next, &acpi_device_list) {
544 struct acpi_device * dev = container_of(node, struct acpi_device, g_list);
545
546 if (dev->driver || !dev->status.present)
547 continue;
548 spin_unlock(&acpi_device_lock);
549
550 if (!acpi_bus_match(dev, drv)) {
551 if (!acpi_bus_driver_init(dev, drv)) {
552 atomic_inc(&drv->references);
553 count++;
554 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
555 drv->name, dev->pnp.bus_id));
556 }
557 }
558 spin_lock(&acpi_device_lock);
559 }
560 spin_unlock(&acpi_device_lock);
561 return_VALUE(count);
562 }
563
564 static int acpi_driver_detach(struct acpi_driver * drv)
565 {
566 struct list_head * node, * next;
567
568 ACPI_FUNCTION_TRACE("acpi_driver_detach");
569
570 spin_lock(&acpi_device_lock);
571 list_for_each_safe(node,next,&acpi_device_list) {
572 struct acpi_device * dev = container_of(node,struct acpi_device,g_list);
573
574 if (dev->driver == drv) {
575 spin_unlock(&acpi_device_lock);
576 if (drv->ops.remove)
577 drv->ops.remove(dev,ACPI_BUS_REMOVAL_NORMAL);
578 spin_lock(&acpi_device_lock);
579 dev->driver = NULL;
580 dev->driver_data = NULL;
581 atomic_dec(&drv->references);
582 }
583 }
584 spin_unlock(&acpi_device_lock);
585 return_VALUE(0);
586 }
587
588 /**
589 * acpi_bus_register_driver
590 * ------------------------
591 * Registers a driver with the ACPI bus. Searches the namespace for all
592 * devices that match the driver's criteria and binds. Returns the
593 * number of devices that were claimed by the driver, or a negative
594 * error status for failure.
595 */
596 int
597 acpi_bus_register_driver (
598 struct acpi_driver *driver)
599 {
600 int count;
601
602 ACPI_FUNCTION_TRACE("acpi_bus_register_driver");
603
604 if (acpi_disabled)
605 return_VALUE(-ENODEV);
606
607 if (!driver)
608 return_VALUE(-EINVAL);
609
610 spin_lock(&acpi_device_lock);
611 list_add_tail(&driver->node, &acpi_bus_drivers);
612 spin_unlock(&acpi_device_lock);
613 count = acpi_driver_attach(driver);
614
615 return_VALUE(count);
616 }
617 EXPORT_SYMBOL(acpi_bus_register_driver);
618
619
620 /**
621 * acpi_bus_unregister_driver
622 * --------------------------
623 * Unregisters a driver with the ACPI bus. Searches the namespace for all
624 * devices that match the driver's criteria and unbinds.
625 */
626 int
627 acpi_bus_unregister_driver (
628 struct acpi_driver *driver)
629 {
630 int error = 0;
631
632 ACPI_FUNCTION_TRACE("acpi_bus_unregister_driver");
633
634 if (driver) {
635 acpi_driver_detach(driver);
636
637 if (!atomic_read(&driver->references)) {
638 spin_lock(&acpi_device_lock);
639 list_del_init(&driver->node);
640 spin_unlock(&acpi_device_lock);
641 }
642 } else
643 error = -EINVAL;
644 return_VALUE(error);
645 }
646 EXPORT_SYMBOL(acpi_bus_unregister_driver);
647
648 /**
649 * acpi_bus_find_driver
650 * --------------------
651 * Parses the list of registered drivers looking for a driver applicable for
652 * the specified device.
653 */
654 static int
655 acpi_bus_find_driver (
656 struct acpi_device *device)
657 {
658 int result = 0;
659 struct list_head * node, *next;
660
661 ACPI_FUNCTION_TRACE("acpi_bus_find_driver");
662
663 spin_lock(&acpi_device_lock);
664 list_for_each_safe(node,next,&acpi_bus_drivers) {
665 struct acpi_driver * driver = container_of(node,struct acpi_driver,node);
666
667 atomic_inc(&driver->references);
668 spin_unlock(&acpi_device_lock);
669 if (!acpi_bus_match(device, driver)) {
670 result = acpi_bus_driver_init(device, driver);
671 if (!result)
672 goto Done;
673 }
674 atomic_dec(&driver->references);
675 spin_lock(&acpi_device_lock);
676 }
677 spin_unlock(&acpi_device_lock);
678
679 Done:
680 return_VALUE(result);
681 }
682
683
684 /* --------------------------------------------------------------------------
685 Device Enumeration
686 -------------------------------------------------------------------------- */
687
688 static int
689 acpi_bus_get_flags (
690 struct acpi_device *device)
691 {
692 acpi_status status = AE_OK;
693 acpi_handle temp = NULL;
694
695 ACPI_FUNCTION_TRACE("acpi_bus_get_flags");
696
697 /* Presence of _STA indicates 'dynamic_status' */
698 status = acpi_get_handle(device->handle, "_STA", &temp);
699 if (ACPI_SUCCESS(status))
700 device->flags.dynamic_status = 1;
701
702 /* Presence of _CID indicates 'compatible_ids' */
703 status = acpi_get_handle(device->handle, "_CID", &temp);
704 if (ACPI_SUCCESS(status))
705 device->flags.compatible_ids = 1;
706
707 /* Presence of _RMV indicates 'removable' */
708 status = acpi_get_handle(device->handle, "_RMV", &temp);
709 if (ACPI_SUCCESS(status))
710 device->flags.removable = 1;
711
712 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
713 status = acpi_get_handle(device->handle, "_EJD", &temp);
714 if (ACPI_SUCCESS(status))
715 device->flags.ejectable = 1;
716 else {
717 status = acpi_get_handle(device->handle, "_EJ0", &temp);
718 if (ACPI_SUCCESS(status))
719 device->flags.ejectable = 1;
720 }
721
722 /* Presence of _LCK indicates 'lockable' */
723 status = acpi_get_handle(device->handle, "_LCK", &temp);
724 if (ACPI_SUCCESS(status))
725 device->flags.lockable = 1;
726
727 /* Presence of _PS0|_PR0 indicates 'power manageable' */
728 status = acpi_get_handle(device->handle, "_PS0", &temp);
729 if (ACPI_FAILURE(status))
730 status = acpi_get_handle(device->handle, "_PR0", &temp);
731 if (ACPI_SUCCESS(status))
732 device->flags.power_manageable = 1;
733
734 /* Presence of _PRW indicates wake capable */
735 status = acpi_get_handle(device->handle, "_PRW", &temp);
736 if (ACPI_SUCCESS(status))
737 device->flags.wake_capable = 1;
738
739 /* TBD: Peformance management */
740
741 return_VALUE(0);
742 }
743
744 static void acpi_device_get_busid(struct acpi_device * device, acpi_handle handle, int type)
745 {
746 char bus_id[5] = {'?',0};
747 struct acpi_buffer buffer = {sizeof(bus_id), bus_id};
748 int i = 0;
749
750 /*
751 * Bus ID
752 * ------
753 * The device's Bus ID is simply the object name.
754 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
755 */
756 switch (type) {
757 case ACPI_BUS_TYPE_SYSTEM:
758 strcpy(device->pnp.bus_id, "ACPI");
759 break;
760 case ACPI_BUS_TYPE_POWER_BUTTON:
761 strcpy(device->pnp.bus_id, "PWRF");
762 break;
763 case ACPI_BUS_TYPE_SLEEP_BUTTON:
764 strcpy(device->pnp.bus_id, "SLPF");
765 break;
766 default:
767 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
768 /* Clean up trailing underscores (if any) */
769 for (i = 3; i > 1; i--) {
770 if (bus_id[i] == '_')
771 bus_id[i] = '\0';
772 else
773 break;
774 }
775 strcpy(device->pnp.bus_id, bus_id);
776 break;
777 }
778 }
779
780 static void acpi_device_set_id(struct acpi_device * device, struct acpi_device * parent,
781 acpi_handle handle, int type)
782 {
783 struct acpi_device_info *info;
784 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
785 char *hid = NULL;
786 char *uid = NULL;
787 struct acpi_compatible_id_list *cid_list = NULL;
788 acpi_status status;
789
790 switch (type) {
791 case ACPI_BUS_TYPE_DEVICE:
792 status = acpi_get_object_info(handle, &buffer);
793 if (ACPI_FAILURE(status)) {
794 printk("%s: Error reading device info\n",__FUNCTION__);
795 return;
796 }
797
798 info = buffer.pointer;
799 if (info->valid & ACPI_VALID_HID)
800 hid = info->hardware_id.value;
801 if (info->valid & ACPI_VALID_UID)
802 uid = info->unique_id.value;
803 if (info->valid & ACPI_VALID_CID)
804 cid_list = &info->compatibility_id;
805 if (info->valid & ACPI_VALID_ADR) {
806 device->pnp.bus_address = info->address;
807 device->flags.bus_address = 1;
808 }
809 break;
810 case ACPI_BUS_TYPE_POWER:
811 hid = ACPI_POWER_HID;
812 break;
813 case ACPI_BUS_TYPE_PROCESSOR:
814 hid = ACPI_PROCESSOR_HID;
815 break;
816 case ACPI_BUS_TYPE_SYSTEM:
817 hid = ACPI_SYSTEM_HID;
818 break;
819 case ACPI_BUS_TYPE_THERMAL:
820 hid = ACPI_THERMAL_HID;
821 break;
822 case ACPI_BUS_TYPE_POWER_BUTTON:
823 hid = ACPI_BUTTON_HID_POWERF;
824 break;
825 case ACPI_BUS_TYPE_SLEEP_BUTTON:
826 hid = ACPI_BUTTON_HID_SLEEPF;
827 break;
828 }
829
830 /*
831 * \_SB
832 * ----
833 * Fix for the system root bus device -- the only root-level device.
834 */
835 if ((parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
836 hid = ACPI_BUS_HID;
837 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
838 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
839 }
840
841 if (hid) {
842 strcpy(device->pnp.hardware_id, hid);
843 device->flags.hardware_id = 1;
844 }
845 if (uid) {
846 strcpy(device->pnp.unique_id, uid);
847 device->flags.unique_id = 1;
848 }
849 if (cid_list) {
850 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
851 if (device->pnp.cid_list)
852 memcpy(device->pnp.cid_list, cid_list, cid_list->size);
853 else
854 printk(KERN_ERR "Memory allocation error\n");
855 }
856
857 acpi_os_free(buffer.pointer);
858 }
859
860 int acpi_device_set_context(struct acpi_device * device, int type)
861 {
862 acpi_status status = AE_OK;
863 int result = 0;
864 /*
865 * Context
866 * -------
867 * Attach this 'struct acpi_device' to the ACPI object. This makes
868 * resolutions from handle->device very efficient. Note that we need
869 * to be careful with fixed-feature devices as they all attach to the
870 * root object.
871 */
872 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
873 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
874 status = acpi_attach_data(device->handle,
875 acpi_bus_data_handler, device);
876
877 if (ACPI_FAILURE(status)) {
878 printk("Error attaching device data\n");
879 result = -ENODEV;
880 }
881 }
882 return result;
883 }
884
885 void acpi_device_get_debug_info(struct acpi_device * device, acpi_handle handle, int type)
886 {
887 #ifdef CONFIG_ACPI_DEBUG_OUTPUT
888 char *type_string = NULL;
889 char name[80] = {'?','\0'};
890 struct acpi_buffer buffer = {sizeof(name), name};
891
892 switch (type) {
893 case ACPI_BUS_TYPE_DEVICE:
894 type_string = "Device";
895 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
896 break;
897 case ACPI_BUS_TYPE_POWER:
898 type_string = "Power Resource";
899 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
900 break;
901 case ACPI_BUS_TYPE_PROCESSOR:
902 type_string = "Processor";
903 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
904 break;
905 case ACPI_BUS_TYPE_SYSTEM:
906 type_string = "System";
907 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
908 break;
909 case ACPI_BUS_TYPE_THERMAL:
910 type_string = "Thermal Zone";
911 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
912 break;
913 case ACPI_BUS_TYPE_POWER_BUTTON:
914 type_string = "Power Button";
915 sprintf(name, "PWRB");
916 break;
917 case ACPI_BUS_TYPE_SLEEP_BUTTON:
918 type_string = "Sleep Button";
919 sprintf(name, "SLPB");
920 break;
921 }
922
923 printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle);
924 #endif /*CONFIG_ACPI_DEBUG_OUTPUT*/
925 }
926
927
928 int
929 acpi_bus_remove (
930 struct acpi_device *dev,
931 int rmdevice)
932 {
933 int result = 0;
934 struct acpi_driver *driver;
935
936 ACPI_FUNCTION_TRACE("acpi_bus_remove");
937
938 if (!dev)
939 return_VALUE(-EINVAL);
940
941 driver = dev->driver;
942
943 if ((driver) && (driver->ops.remove)) {
944
945 if (driver->ops.stop) {
946 result = driver->ops.stop(dev, ACPI_BUS_REMOVAL_EJECT);
947 if (result)
948 return_VALUE(result);
949 }
950
951 result = dev->driver->ops.remove(dev, ACPI_BUS_REMOVAL_EJECT);
952 if (result) {
953 return_VALUE(result);
954 }
955
956 atomic_dec(&dev->driver->references);
957 dev->driver = NULL;
958 acpi_driver_data(dev) = NULL;
959 }
960
961 if (!rmdevice)
962 return_VALUE(0);
963
964 if (dev->flags.bus_address) {
965 if ((dev->parent) && (dev->parent->ops.unbind))
966 dev->parent->ops.unbind(dev);
967 }
968
969 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
970
971 return_VALUE(0);
972 }
973
974
975 int
976 acpi_bus_add (
977 struct acpi_device **child,
978 struct acpi_device *parent,
979 acpi_handle handle,
980 int type)
981 {
982 int result = 0;
983 struct acpi_device *device = NULL;
984
985 ACPI_FUNCTION_TRACE("acpi_bus_add");
986
987 if (!child)
988 return_VALUE(-EINVAL);
989
990 device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
991 if (!device) {
992 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n"));
993 return_VALUE(-ENOMEM);
994 }
995 memset(device, 0, sizeof(struct acpi_device));
996
997 device->handle = handle;
998 device->parent = parent;
999
1000 acpi_device_get_busid(device,handle,type);
1001
1002 /*
1003 * Flags
1004 * -----
1005 * Get prior to calling acpi_bus_get_status() so we know whether
1006 * or not _STA is present. Note that we only look for object
1007 * handles -- cannot evaluate objects until we know the device is
1008 * present and properly initialized.
1009 */
1010 result = acpi_bus_get_flags(device);
1011 if (result)
1012 goto end;
1013
1014 /*
1015 * Status
1016 * ------
1017 * See if the device is present. We always assume that non-Device()
1018 * objects (e.g. thermal zones, power resources, processors, etc.) are
1019 * present, functioning, etc. (at least when parent object is present).
1020 * Note that _STA has a different meaning for some objects (e.g.
1021 * power resources) so we need to be careful how we use it.
1022 */
1023 switch (type) {
1024 case ACPI_BUS_TYPE_DEVICE:
1025 result = acpi_bus_get_status(device);
1026 if (ACPI_FAILURE(result) || !device->status.present) {
1027 result = -ENOENT;
1028 goto end;
1029 }
1030 break;
1031 default:
1032 STRUCT_TO_INT(device->status) = 0x0F;
1033 break;
1034 }
1035
1036 /*
1037 * Initialize Device
1038 * -----------------
1039 * TBD: Synch with Core's enumeration/initialization process.
1040 */
1041
1042 /*
1043 * Hardware ID, Unique ID, & Bus Address
1044 * -------------------------------------
1045 */
1046 acpi_device_set_id(device,parent,handle,type);
1047
1048 /*
1049 * Power Management
1050 * ----------------
1051 */
1052 if (device->flags.power_manageable) {
1053 result = acpi_bus_get_power_flags(device);
1054 if (result)
1055 goto end;
1056 }
1057
1058 /*
1059 * Wakeup device management
1060 *-----------------------
1061 */
1062 if (device->flags.wake_capable) {
1063 result = acpi_bus_get_wakeup_device_flags(device);
1064 if (result)
1065 goto end;
1066 }
1067
1068 /*
1069 * Performance Management
1070 * ----------------------
1071 */
1072 if (device->flags.performance_manageable) {
1073 result = acpi_bus_get_perf_flags(device);
1074 if (result)
1075 goto end;
1076 }
1077
1078 if ((result = acpi_device_set_context(device,type)))
1079 goto end;
1080
1081 acpi_device_get_debug_info(device,handle,type);
1082
1083 acpi_device_register(device,parent);
1084
1085 /*
1086 * Bind _ADR-Based Devices
1087 * -----------------------
1088 * If there's a a bus address (_ADR) then we utilize the parent's
1089 * 'bind' function (if exists) to bind the ACPI- and natively-
1090 * enumerated device representations.
1091 */
1092 if (device->flags.bus_address) {
1093 if (device->parent && device->parent->ops.bind)
1094 device->parent->ops.bind(device);
1095 }
1096
1097 /*
1098 * Locate & Attach Driver
1099 * ----------------------
1100 * If there's a hardware id (_HID) or compatible ids (_CID) we check
1101 * to see if there's a driver installed for this kind of device. Note
1102 * that drivers can install before or after a device is enumerated.
1103 *
1104 * TBD: Assumes LDM provides driver hot-plug capability.
1105 */
1106 acpi_bus_find_driver(device);
1107
1108 end:
1109 if (!result)
1110 *child = device;
1111 else {
1112 if (device->pnp.cid_list)
1113 kfree(device->pnp.cid_list);
1114 kfree(device);
1115 }
1116
1117 return_VALUE(result);
1118 }
1119 EXPORT_SYMBOL(acpi_bus_add);
1120
1121
1122 int acpi_bus_scan (struct acpi_device *start)
1123 {
1124 acpi_status status = AE_OK;
1125 struct acpi_device *parent = NULL;
1126 struct acpi_device *child = NULL;
1127 acpi_handle phandle = NULL;
1128 acpi_handle chandle = NULL;
1129 acpi_object_type type = 0;
1130 u32 level = 1;
1131
1132 ACPI_FUNCTION_TRACE("acpi_bus_scan");
1133
1134 if (!start)
1135 return_VALUE(-EINVAL);
1136
1137 parent = start;
1138 phandle = start->handle;
1139
1140 /*
1141 * Parse through the ACPI namespace, identify all 'devices', and
1142 * create a new 'struct acpi_device' for each.
1143 */
1144 while ((level > 0) && parent) {
1145
1146 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1147 chandle, &chandle);
1148
1149 /*
1150 * If this scope is exhausted then move our way back up.
1151 */
1152 if (ACPI_FAILURE(status)) {
1153 level--;
1154 chandle = phandle;
1155 acpi_get_parent(phandle, &phandle);
1156 if (parent->parent)
1157 parent = parent->parent;
1158 continue;
1159 }
1160
1161 status = acpi_get_type(chandle, &type);
1162 if (ACPI_FAILURE(status))
1163 continue;
1164
1165 /*
1166 * If this is a scope object then parse it (depth-first).
1167 */
1168 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1169 level++;
1170 phandle = chandle;
1171 chandle = NULL;
1172 continue;
1173 }
1174
1175 /*
1176 * We're only interested in objects that we consider 'devices'.
1177 */
1178 switch (type) {
1179 case ACPI_TYPE_DEVICE:
1180 type = ACPI_BUS_TYPE_DEVICE;
1181 break;
1182 case ACPI_TYPE_PROCESSOR:
1183 type = ACPI_BUS_TYPE_PROCESSOR;
1184 break;
1185 case ACPI_TYPE_THERMAL:
1186 type = ACPI_BUS_TYPE_THERMAL;
1187 break;
1188 case ACPI_TYPE_POWER:
1189 type = ACPI_BUS_TYPE_POWER;
1190 break;
1191 default:
1192 continue;
1193 }
1194
1195 status = acpi_bus_add(&child, parent, chandle, type);
1196 if (ACPI_FAILURE(status))
1197 continue;
1198
1199 /*
1200 * If the device is present, enabled, and functioning then
1201 * parse its scope (depth-first). Note that we need to
1202 * represent absent devices to facilitate PnP notifications
1203 * -- but only the subtree head (not all of its children,
1204 * which will be enumerated when the parent is inserted).
1205 *
1206 * TBD: Need notifications and other detection mechanisms
1207 * in place before we can fully implement this.
1208 */
1209 if (child->status.present) {
1210 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1211 NULL, NULL);
1212 if (ACPI_SUCCESS(status)) {
1213 level++;
1214 phandle = chandle;
1215 chandle = NULL;
1216 parent = child;
1217 }
1218 }
1219 }
1220
1221 return_VALUE(0);
1222 }
1223 EXPORT_SYMBOL(acpi_bus_scan);
1224
1225
1226 int
1227 acpi_bus_trim(struct acpi_device *start,
1228 int rmdevice)
1229 {
1230 acpi_status status;
1231 struct acpi_device *parent, *child;
1232 acpi_handle phandle, chandle;
1233 acpi_object_type type;
1234 u32 level = 1;
1235 int err = 0;
1236
1237 parent = start;
1238 phandle = start->handle;
1239 child = chandle = NULL;
1240
1241 while ((level > 0) && parent && (!err)) {
1242 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1243 chandle, &chandle);
1244
1245 /*
1246 * If this scope is exhausted then move our way back up.
1247 */
1248 if (ACPI_FAILURE(status)) {
1249 level--;
1250 chandle = phandle;
1251 acpi_get_parent(phandle, &phandle);
1252 child = parent;
1253 parent = parent->parent;
1254
1255 if (level == 0)
1256 err = acpi_bus_remove(child, rmdevice);
1257 else
1258 err = acpi_bus_remove(child, 1);
1259
1260 continue;
1261 }
1262
1263 status = acpi_get_type(chandle, &type);
1264 if (ACPI_FAILURE(status)) {
1265 continue;
1266 }
1267 /*
1268 * If there is a device corresponding to chandle then
1269 * parse it (depth-first).
1270 */
1271 if (acpi_bus_get_device(chandle, &child) == 0) {
1272 level++;
1273 phandle = chandle;
1274 chandle = NULL;
1275 parent = child;
1276 }
1277 continue;
1278 }
1279 return err;
1280 }
1281
1282 static int
1283 acpi_bus_scan_fixed (
1284 struct acpi_device *root)
1285 {
1286 int result = 0;
1287 struct acpi_device *device = NULL;
1288
1289 ACPI_FUNCTION_TRACE("acpi_bus_scan_fixed");
1290
1291 if (!root)
1292 return_VALUE(-ENODEV);
1293
1294 /*
1295 * Enumerate all fixed-feature devices.
1296 */
1297 if (acpi_fadt.pwr_button == 0)
1298 result = acpi_bus_add(&device, acpi_root,
1299 NULL, ACPI_BUS_TYPE_POWER_BUTTON);
1300
1301 if (acpi_fadt.sleep_button == 0)
1302 result = acpi_bus_add(&device, acpi_root,
1303 NULL, ACPI_BUS_TYPE_SLEEP_BUTTON);
1304
1305 return_VALUE(result);
1306 }
1307
1308
1309 static int __init acpi_scan_init(void)
1310 {
1311 int result;
1312
1313 ACPI_FUNCTION_TRACE("acpi_scan_init");
1314
1315 if (acpi_disabled)
1316 return_VALUE(0);
1317
1318 kset_register(&acpi_namespace_kset);
1319
1320 /*
1321 * Create the root device in the bus's device tree
1322 */
1323 result = acpi_bus_add(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1324 ACPI_BUS_TYPE_SYSTEM);
1325 if (result)
1326 goto Done;
1327
1328 /*
1329 * Enumerate devices in the ACPI namespace.
1330 */
1331 result = acpi_bus_scan_fixed(acpi_root);
1332 if (!result)
1333 result = acpi_bus_scan(acpi_root);
1334
1335 if (result)
1336 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1337
1338 Done:
1339 return_VALUE(result);
1340 }
1341
1342 subsys_initcall(acpi_scan_init);
1343
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