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[linux-2.6-block.git] / drivers / acpi / scan.c
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1da177e4
LT		 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
14ACPI_MODULE_NAME ("scan")
15
16#define STRUCT_TO_INT(s) (*((int*)&s))
17
18extern 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
26static LIST_HEAD(acpi_device_list);
27DEFINE_SPINLOCK(acpi_device_lock);
28LIST_HEAD(acpi_wakeup_device_list);
29
30static int
31acpi_bus_trim(struct acpi_device *start,
32 int rmdevice);
33
34static void acpi_device_release(struct kobject * kobj)
35{
36 struct acpi_device * dev = container_of(kobj,struct acpi_device,kobj);
37 if (dev->pnp.cid_list)
38 kfree(dev->pnp.cid_list);
39 kfree(dev);
40}
41
42struct acpi_device_attribute {
43 struct attribute attr;
44 ssize_t (*show)(struct acpi_device *, char *);
45 ssize_t (*store)(struct acpi_device *, const char *, size_t);
46};
47
48typedef void acpi_device_sysfs_files(struct kobject *,
49 const struct attribute *);
50
51static void setup_sys_fs_device_files(struct acpi_device *dev,
52 acpi_device_sysfs_files *func);
53
54#define create_sysfs_device_files(dev) \
55 setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file)
56#define remove_sysfs_device_files(dev) \
57 setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file)
58
59
60#define to_acpi_device(n) container_of(n, struct acpi_device, kobj)
61#define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr);
62
63static ssize_t acpi_device_attr_show(struct kobject *kobj,
64 struct attribute *attr, char *buf)
65{
66 struct acpi_device *device = to_acpi_device(kobj);
67 struct acpi_device_attribute *attribute = to_handle_attr(attr);
70f2817a 68 return attribute->show ? attribute->show(device, buf) : -EIO;
1da177e4
LT		 69}
70static ssize_t acpi_device_attr_store(struct kobject *kobj,
71 struct attribute *attr, const char *buf, size_t len)
72{
73 struct acpi_device *device = to_acpi_device(kobj);
74 struct acpi_device_attribute *attribute = to_handle_attr(attr);
70f2817a 75 return attribute->store ? attribute->store(device, buf, len) : -EIO;
1da177e4
LT		 76}
77
78static struct sysfs_ops acpi_device_sysfs_ops = {
79 .show = acpi_device_attr_show,
80 .store = acpi_device_attr_store,
81};
82
83static struct kobj_type ktype_acpi_ns = {
84 .sysfs_ops = &acpi_device_sysfs_ops,
85 .release = acpi_device_release,
86};
87
88static int namespace_hotplug(struct kset *kset, struct kobject *kobj,
89 char **envp, int num_envp, char *buffer,
90 int buffer_size)
91{
92 struct acpi_device *dev = to_acpi_device(kobj);
93 int i = 0;
94 int len = 0;
95
96 if (!dev->driver)
97 return 0;
98
99 if (add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, &len,
100 "PHYSDEVDRIVER=%s", dev->driver->name))
101 return -ENOMEM;
102
103 envp[i] = NULL;
104
105 return 0;
106}
107
108static struct kset_hotplug_ops namespace_hotplug_ops = {
109 .hotplug = &namespace_hotplug,
110};
111
112static struct kset acpi_namespace_kset = {
113 .kobj = {
114 .name = "namespace",
115 },
116 .subsys = &acpi_subsys,
117 .ktype = &ktype_acpi_ns,
118 .hotplug_ops = &namespace_hotplug_ops,
119};
120
121
122static void acpi_device_register(struct acpi_device * device, struct acpi_device * parent)
123{
124 /*
125 * Linkage
126 * -------
127 * Link this device to its parent and siblings.
128 */
129 INIT_LIST_HEAD(&device->children);
130 INIT_LIST_HEAD(&device->node);
131 INIT_LIST_HEAD(&device->g_list);
132 INIT_LIST_HEAD(&device->wakeup_list);
133
134 spin_lock(&acpi_device_lock);
135 if (device->parent) {
136 list_add_tail(&device->node, &device->parent->children);
137 list_add_tail(&device->g_list,&device->parent->g_list);
138 } else
139 list_add_tail(&device->g_list,&acpi_device_list);
140 if (device->wakeup.flags.valid)
141 list_add_tail(&device->wakeup_list,&acpi_wakeup_device_list);
142 spin_unlock(&acpi_device_lock);
143
144 strlcpy(device->kobj.name,device->pnp.bus_id,KOBJ_NAME_LEN);
145 if (parent)
146 device->kobj.parent = &parent->kobj;
147 device->kobj.ktype = &ktype_acpi_ns;
148 device->kobj.kset = &acpi_namespace_kset;
149 kobject_register(&device->kobj);
150 create_sysfs_device_files(device);
151}
152
153static int
154acpi_device_unregister (
155 struct acpi_device *device,
156 int type)
157{
158 spin_lock(&acpi_device_lock);
159 if (device->parent) {
160 list_del(&device->node);
161 list_del(&device->g_list);
162 } else
163 list_del(&device->g_list);
164
165 list_del(&device->wakeup_list);
166
167 spin_unlock(&acpi_device_lock);
168
169 acpi_detach_data(device->handle, acpi_bus_data_handler);
170 remove_sysfs_device_files(device);
171 kobject_unregister(&device->kobj);
172 return 0;
173}
174
175void
176acpi_bus_data_handler (
177 acpi_handle handle,
178 u32 function,
179 void *context)
180{
181 ACPI_FUNCTION_TRACE("acpi_bus_data_handler");
182
183 /* TBD */
184
185 return_VOID;
186}
187
188static int
189acpi_bus_get_power_flags (
190 struct acpi_device *device)
191{
192 acpi_status status = 0;
193 acpi_handle handle = NULL;
194 u32 i = 0;
195
196 ACPI_FUNCTION_TRACE("acpi_bus_get_power_flags");
197
198 /*
199 * Power Management Flags
200 */
201 status = acpi_get_handle(device->handle, "_PSC", &handle);
202 if (ACPI_SUCCESS(status))
203 device->power.flags.explicit_get = 1;
204 status = acpi_get_handle(device->handle, "_IRC", &handle);
205 if (ACPI_SUCCESS(status))
206 device->power.flags.inrush_current = 1;
207
208 /*
209 * Enumerate supported power management states
210 */
211 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
212 struct acpi_device_power_state *ps = &device->power.states[i];
213 char object_name[5] = {'_','P','R','0'+i,'\0'};
214
215 /* Evaluate "_PRx" to se if power resources are referenced */
216 acpi_evaluate_reference(device->handle, object_name, NULL,
217 &ps->resources);
218 if (ps->resources.count) {
219 device->power.flags.power_resources = 1;
220 ps->flags.valid = 1;
221 }
222
223 /* Evaluate "_PSx" to see if we can do explicit sets */
224 object_name[2] = 'S';
225 status = acpi_get_handle(device->handle, object_name, &handle);
226 if (ACPI_SUCCESS(status)) {
227 ps->flags.explicit_set = 1;
228 ps->flags.valid = 1;
229 }
230
231 /* State is valid if we have some power control */
232 if (ps->resources.count || ps->flags.explicit_set)
233 ps->flags.valid = 1;
234
235 ps->power = -1; /* Unknown - driver assigned */
236 ps->latency = -1; /* Unknown - driver assigned */
237 }
238
239 /* Set defaults for D0 and D3 states (always valid) */
240 device->power.states[ACPI_STATE_D0].flags.valid = 1;
241 device->power.states[ACPI_STATE_D0].power = 100;
242 device->power.states[ACPI_STATE_D3].flags.valid = 1;
243 device->power.states[ACPI_STATE_D3].power = 0;
244
245 /* TBD: System wake support and resource requirements. */
246
247 device->power.state = ACPI_STATE_UNKNOWN;
248
249 return_VALUE(0);
250}
251
252int
253acpi_match_ids (
254 struct acpi_device *device,
255 char *ids)
256{
257 int error = 0;
258 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
259
260 if (device->flags.hardware_id)
261 if (strstr(ids, device->pnp.hardware_id))
262 goto Done;
263
264 if (device->flags.compatible_ids) {
265 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
266 int i;
267
268 /* compare multiple _CID entries against driver ids */
269 for (i = 0; i < cid_list->count; i++)
270 {
271 if (strstr(ids, cid_list->id[i].value))
272 goto Done;
273 }
274 }
275 error = -ENOENT;
276
277 Done:
278 if (buffer.pointer)
279 acpi_os_free(buffer.pointer);
280 return error;
281}
282
283static acpi_status
284acpi_bus_extract_wakeup_device_power_package (
285 struct acpi_device *device,
286 union acpi_object *package)
287{
288 int i = 0;
289 union acpi_object *element = NULL;
290
291 if (!device || !package || (package->package.count < 2))
292 return AE_BAD_PARAMETER;
293
294 element = &(package->package.elements[0]);
295 if (!element)
296 return AE_BAD_PARAMETER;
297 if (element->type == ACPI_TYPE_PACKAGE) {
298 if ((element->package.count < 2) ||
299 (element->package.elements[0].type != ACPI_TYPE_LOCAL_REFERENCE) ||
300 (element->package.elements[1].type != ACPI_TYPE_INTEGER))
301 return AE_BAD_DATA;
302 device->wakeup.gpe_device = element->package.elements[0].reference.handle;
303 device->wakeup.gpe_number = (u32)element->package.elements[1].integer.value;
304 }else if (element->type == ACPI_TYPE_INTEGER) {
305 device->wakeup.gpe_number = element->integer.value;
306 }else
307 return AE_BAD_DATA;
308
309 element = &(package->package.elements[1]);
310 if (element->type != ACPI_TYPE_INTEGER) {
311 return AE_BAD_DATA;
312 }
313 device->wakeup.sleep_state = element->integer.value;
314
315 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
316 return AE_NO_MEMORY;
317 }
318 device->wakeup.resources.count = package->package.count - 2;
319 for (i=0; i < device->wakeup.resources.count; i++) {
320 element = &(package->package.elements[i + 2]);
321 if (element->type != ACPI_TYPE_ANY ) {
322 return AE_BAD_DATA;
323 }
324
325 device->wakeup.resources.handles[i] = element->reference.handle;
326 }
327
328 return AE_OK;
329}
330
331static int
332acpi_bus_get_wakeup_device_flags (
333 struct acpi_device *device)
334{
335 acpi_status status = 0;
336 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
337 union acpi_object *package = NULL;
338
339 ACPI_FUNCTION_TRACE("acpi_bus_get_wakeup_flags");
340
341 /* _PRW */
342 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
343 if (ACPI_FAILURE(status)) {
344 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRW\n"));
345 goto end;
346 }
347
348 package = (union acpi_object *) buffer.pointer;
349 status = acpi_bus_extract_wakeup_device_power_package(device, package);
350 if (ACPI_FAILURE(status)) {
351 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error extracting _PRW package\n"));
352 goto end;
353 }
354
355 acpi_os_free(buffer.pointer);
356
357 device->wakeup.flags.valid = 1;
358 /* Power button, Lid switch always enable wakeup*/
359 if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E"))
360 device->wakeup.flags.run_wake = 1;
361
362end:
363 if (ACPI_FAILURE(status))
364 device->flags.wake_capable = 0;
365 return_VALUE(0);
366}
367
368/* --------------------------------------------------------------------------
369 ACPI hotplug sysfs device file support
370 -------------------------------------------------------------------------- */
371static ssize_t acpi_eject_store(struct acpi_device *device,
372 const char *buf, size_t count);
373
374#define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \
375static struct acpi_device_attribute acpi_device_attr_##_name = \
376 __ATTR(_name, _mode, _show, _store)
377
378ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
379
380/**
381 * setup_sys_fs_device_files - sets up the device files under device namespace
67be2dd1
MW		 382 * @dev: acpi_device object
383 * @func: function pointer to create or destroy the device file
1da177e4
LT		 384 */
385static void
386setup_sys_fs_device_files (
387 struct acpi_device *dev,
388 acpi_device_sysfs_files *func)
389{
390 acpi_status status;
391 acpi_handle temp = NULL;
392
393 /*
394 * If device has _EJ0, 'eject' file is created that is used to trigger
395 * hot-removal function from userland.
396 */
397 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
398 if (ACPI_SUCCESS(status))
399 (*(func))(&dev->kobj,&acpi_device_attr_eject.attr);
400}
401
402static int
403acpi_eject_operation(acpi_handle handle, int lockable)
404{
405 struct acpi_object_list arg_list;
406 union acpi_object arg;
407 acpi_status status = AE_OK;
408
409 /*
410 * TBD: evaluate _PS3?
411 */
412
413 if (lockable) {
414 arg_list.count = 1;
415 arg_list.pointer = &arg;
416 arg.type = ACPI_TYPE_INTEGER;
417 arg.integer.value = 0;
418 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
419 }
420
421 arg_list.count = 1;
422 arg_list.pointer = &arg;
423 arg.type = ACPI_TYPE_INTEGER;
424 arg.integer.value = 1;
425
426 /*
427 * TBD: _EJD support.
428 */
429
430 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
431 if (ACPI_FAILURE(status)) {
432 return(-ENODEV);
433 }
434
435 return(0);
436}
437
438
439static ssize_t
440acpi_eject_store(struct acpi_device *device, const char *buf, size_t count)
441{
442 int result;
443 int ret = count;
444 int islockable;
445 acpi_status status;
446 acpi_handle handle;
447 acpi_object_type type = 0;
448
449 if ((!count) || (buf[0] != '1')) {
450 return -EINVAL;
451 }
452
453#ifndef FORCE_EJECT
454 if (device->driver == NULL) {
455 ret = -ENODEV;
456 goto err;
457 }
458#endif
459 status = acpi_get_type(device->handle, &type);
460 if (ACPI_FAILURE(status) || (!device->flags.ejectable) ) {
461 ret = -ENODEV;
462 goto err;
463 }
464
465 islockable = device->flags.lockable;
466 handle = device->handle;
467
468 if (type == ACPI_TYPE_PROCESSOR)
469 result = acpi_bus_trim(device, 0);
470 else
471 result = acpi_bus_trim(device, 1);
472
473 if (!result)
474 result = acpi_eject_operation(handle, islockable);
475
476 if (result) {
477 ret = -EBUSY;
478 }
479err:
480 return ret;
481}
482
483
484/* --------------------------------------------------------------------------
485 Performance Management
486 -------------------------------------------------------------------------- */
487
488static int
489acpi_bus_get_perf_flags (
490 struct acpi_device *device)
491{
492 device->performance.state = ACPI_STATE_UNKNOWN;
493 return 0;
494}
495
496/* --------------------------------------------------------------------------
497 Driver Management
498 -------------------------------------------------------------------------- */
499
500static LIST_HEAD(acpi_bus_drivers);
501static DECLARE_MUTEX(acpi_bus_drivers_lock);
502
503
504/**
505 * acpi_bus_match
506 * --------------
507 * Checks the device's hardware (_HID) or compatible (_CID) ids to see if it
508 * matches the specified driver's criteria.
509 */
510static int
511acpi_bus_match (
512 struct acpi_device *device,
513 struct acpi_driver *driver)
514{
515 if (driver && driver->ops.match)
516 return driver->ops.match(device, driver);
517 return acpi_match_ids(device, driver->ids);
518}
519
520
521/**
522 * acpi_bus_driver_init
523 * --------------------
524 * Used to initialize a device via its device driver. Called whenever a
525 * driver is bound to a device. Invokes the driver's add() and start() ops.
526 */
527static int
528acpi_bus_driver_init (
529 struct acpi_device *device,
530 struct acpi_driver *driver)
531{
532 int result = 0;
533
534 ACPI_FUNCTION_TRACE("acpi_bus_driver_init");
535
536 if (!device || !driver)
537 return_VALUE(-EINVAL);
538
539 if (!driver->ops.add)
540 return_VALUE(-ENOSYS);
541
542 result = driver->ops.add(device);
543 if (result) {
544 device->driver = NULL;
545 acpi_driver_data(device) = NULL;
546 return_VALUE(result);
547 }
548
549 device->driver = driver;
550
551 /*
552 * TBD - Configuration Management: Assign resources to device based
553 * upon possible configuration and currently allocated resources.
554 */
555
3fb02738
RS		 556 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Driver successfully bound to device\n"));
557 return_VALUE(0);
558}
559
560int
561acpi_start_single_object (
562 struct acpi_device *device)
563{
564 int result = 0;
565 struct acpi_driver *driver;
566
567 ACPI_FUNCTION_TRACE("acpi_start_single_object");
568
569 if (!(driver = device->driver))
570 return_VALUE(0);
571
1da177e4
LT		 572 if (driver->ops.start) {
573 result = driver->ops.start(device);
574 if (result && driver->ops.remove)
575 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
1da177e4
LT		 576 }
577
3fb02738 578 return_VALUE(result);
1da177e4
LT		 579}
580
581static int acpi_driver_attach(struct acpi_driver * drv)
582{
583 struct list_head * node, * next;
584 int count = 0;
585
586 ACPI_FUNCTION_TRACE("acpi_driver_attach");
587
588 spin_lock(&acpi_device_lock);
589 list_for_each_safe(node, next, &acpi_device_list) {
590 struct acpi_device * dev = container_of(node, struct acpi_device, g_list);
591
592 if (dev->driver || !dev->status.present)
593 continue;
594 spin_unlock(&acpi_device_lock);
595
596 if (!acpi_bus_match(dev, drv)) {
597 if (!acpi_bus_driver_init(dev, drv)) {
3fb02738 598 acpi_start_single_object(dev);
1da177e4
LT		 599 atomic_inc(&drv->references);
600 count++;
601 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
602 drv->name, dev->pnp.bus_id));
603 }
604 }
605 spin_lock(&acpi_device_lock);
606 }
607 spin_unlock(&acpi_device_lock);
608 return_VALUE(count);
609}
610
611static int acpi_driver_detach(struct acpi_driver * drv)
612{
613 struct list_head * node, * next;
614
615 ACPI_FUNCTION_TRACE("acpi_driver_detach");
616
617 spin_lock(&acpi_device_lock);
618 list_for_each_safe(node,next,&acpi_device_list) {
619 struct acpi_device * dev = container_of(node,struct acpi_device,g_list);
620
621 if (dev->driver == drv) {
622 spin_unlock(&acpi_device_lock);
623 if (drv->ops.remove)
624 drv->ops.remove(dev,ACPI_BUS_REMOVAL_NORMAL);
625 spin_lock(&acpi_device_lock);
626 dev->driver = NULL;
627 dev->driver_data = NULL;
628 atomic_dec(&drv->references);
629 }
630 }
631 spin_unlock(&acpi_device_lock);
632 return_VALUE(0);
633}
634
635/**
636 * acpi_bus_register_driver
637 * ------------------------
638 * Registers a driver with the ACPI bus. Searches the namespace for all
639 * devices that match the driver's criteria and binds. Returns the
640 * number of devices that were claimed by the driver, or a negative
641 * error status for failure.
642 */
643int
644acpi_bus_register_driver (
645 struct acpi_driver *driver)
646{
647 int count;
648
649 ACPI_FUNCTION_TRACE("acpi_bus_register_driver");
650
651 if (acpi_disabled)
652 return_VALUE(-ENODEV);
653
654 if (!driver)
655 return_VALUE(-EINVAL);
656
657 spin_lock(&acpi_device_lock);
658 list_add_tail(&driver->node, &acpi_bus_drivers);
659 spin_unlock(&acpi_device_lock);
660 count = acpi_driver_attach(driver);
661
662 return_VALUE(count);
663}
664EXPORT_SYMBOL(acpi_bus_register_driver);
665
666
667/**
668 * acpi_bus_unregister_driver
669 * --------------------------
670 * Unregisters a driver with the ACPI bus. Searches the namespace for all
671 * devices that match the driver's criteria and unbinds.
672 */
673int
674acpi_bus_unregister_driver (
675 struct acpi_driver *driver)
676{
677 int error = 0;
678
679 ACPI_FUNCTION_TRACE("acpi_bus_unregister_driver");
680
681 if (driver) {
682 acpi_driver_detach(driver);
683
684 if (!atomic_read(&driver->references)) {
685 spin_lock(&acpi_device_lock);
686 list_del_init(&driver->node);
687 spin_unlock(&acpi_device_lock);
688 }
689 } else
690 error = -EINVAL;
691 return_VALUE(error);
692}
693EXPORT_SYMBOL(acpi_bus_unregister_driver);
694
695/**
696 * acpi_bus_find_driver
697 * --------------------
698 * Parses the list of registered drivers looking for a driver applicable for
699 * the specified device.
700 */
701static int
702acpi_bus_find_driver (
703 struct acpi_device *device)
704{
705 int result = 0;
706 struct list_head * node, *next;
707
708 ACPI_FUNCTION_TRACE("acpi_bus_find_driver");
709
710 spin_lock(&acpi_device_lock);
711 list_for_each_safe(node,next,&acpi_bus_drivers) {
712 struct acpi_driver * driver = container_of(node,struct acpi_driver,node);
713
714 atomic_inc(&driver->references);
715 spin_unlock(&acpi_device_lock);
716 if (!acpi_bus_match(device, driver)) {
717 result = acpi_bus_driver_init(device, driver);
718 if (!result)
719 goto Done;
720 }
721 atomic_dec(&driver->references);
722 spin_lock(&acpi_device_lock);
723 }
724 spin_unlock(&acpi_device_lock);
725
726 Done:
727 return_VALUE(result);
728}
729
730
731/* --------------------------------------------------------------------------
732 Device Enumeration
733 -------------------------------------------------------------------------- */
734
735static int
736acpi_bus_get_flags (
737 struct acpi_device *device)
738{
739 acpi_status status = AE_OK;
740 acpi_handle temp = NULL;
741
742 ACPI_FUNCTION_TRACE("acpi_bus_get_flags");
743
744 /* Presence of _STA indicates 'dynamic_status' */
745 status = acpi_get_handle(device->handle, "_STA", &temp);
746 if (ACPI_SUCCESS(status))
747 device->flags.dynamic_status = 1;
748
749 /* Presence of _CID indicates 'compatible_ids' */
750 status = acpi_get_handle(device->handle, "_CID", &temp);
751 if (ACPI_SUCCESS(status))
752 device->flags.compatible_ids = 1;
753
754 /* Presence of _RMV indicates 'removable' */
755 status = acpi_get_handle(device->handle, "_RMV", &temp);
756 if (ACPI_SUCCESS(status))
757 device->flags.removable = 1;
758
759 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
760 status = acpi_get_handle(device->handle, "_EJD", &temp);
761 if (ACPI_SUCCESS(status))
762 device->flags.ejectable = 1;
763 else {
764 status = acpi_get_handle(device->handle, "_EJ0", &temp);
765 if (ACPI_SUCCESS(status))
766 device->flags.ejectable = 1;
767 }
768
769 /* Presence of _LCK indicates 'lockable' */
770 status = acpi_get_handle(device->handle, "_LCK", &temp);
771 if (ACPI_SUCCESS(status))
772 device->flags.lockable = 1;
773
774 /* Presence of _PS0|_PR0 indicates 'power manageable' */
775 status = acpi_get_handle(device->handle, "_PS0", &temp);
776 if (ACPI_FAILURE(status))
777 status = acpi_get_handle(device->handle, "_PR0", &temp);
778 if (ACPI_SUCCESS(status))
779 device->flags.power_manageable = 1;
780
781 /* Presence of _PRW indicates wake capable */
782 status = acpi_get_handle(device->handle, "_PRW", &temp);
783 if (ACPI_SUCCESS(status))
784 device->flags.wake_capable = 1;
785
786 /* TBD: Peformance management */
787
788 return_VALUE(0);
789}
790
791static void acpi_device_get_busid(struct acpi_device * device, acpi_handle handle, int type)
792{
793 char bus_id[5] = {'?',0};
794 struct acpi_buffer buffer = {sizeof(bus_id), bus_id};
795 int i = 0;
796
797 /*
798 * Bus ID
799 * ------
800 * The device's Bus ID is simply the object name.
801 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
802 */
803 switch (type) {
804 case ACPI_BUS_TYPE_SYSTEM:
805 strcpy(device->pnp.bus_id, "ACPI");
806 break;
807 case ACPI_BUS_TYPE_POWER_BUTTON:
808 strcpy(device->pnp.bus_id, "PWRF");
809 break;
810 case ACPI_BUS_TYPE_SLEEP_BUTTON:
811 strcpy(device->pnp.bus_id, "SLPF");
812 break;
813 default:
814 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
815 /* Clean up trailing underscores (if any) */
816 for (i = 3; i > 1; i--) {
817 if (bus_id[i] == '_')
818 bus_id[i] = '\0';
819 else
820 break;
821 }
822 strcpy(device->pnp.bus_id, bus_id);
823 break;
824 }
825}
826
827static void acpi_device_set_id(struct acpi_device * device, struct acpi_device * parent,
828 acpi_handle handle, int type)
829{
830 struct acpi_device_info *info;
831 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
832 char *hid = NULL;
833 char *uid = NULL;
834 struct acpi_compatible_id_list *cid_list = NULL;
835 acpi_status status;
836
837 switch (type) {
838 case ACPI_BUS_TYPE_DEVICE:
839 status = acpi_get_object_info(handle, &buffer);
840 if (ACPI_FAILURE(status)) {
841 printk("%s: Error reading device info\n",__FUNCTION__);
842 return;
843 }
844
845 info = buffer.pointer;
846 if (info->valid & ACPI_VALID_HID)
847 hid = info->hardware_id.value;
848 if (info->valid & ACPI_VALID_UID)
849 uid = info->unique_id.value;
850 if (info->valid & ACPI_VALID_CID)
851 cid_list = &info->compatibility_id;
852 if (info->valid & ACPI_VALID_ADR) {
853 device->pnp.bus_address = info->address;
854 device->flags.bus_address = 1;
855 }
856 break;
857 case ACPI_BUS_TYPE_POWER:
858 hid = ACPI_POWER_HID;
859 break;
860 case ACPI_BUS_TYPE_PROCESSOR:
861 hid = ACPI_PROCESSOR_HID;
862 break;
863 case ACPI_BUS_TYPE_SYSTEM:
864 hid = ACPI_SYSTEM_HID;
865 break;
866 case ACPI_BUS_TYPE_THERMAL:
867 hid = ACPI_THERMAL_HID;
868 break;
869 case ACPI_BUS_TYPE_POWER_BUTTON:
870 hid = ACPI_BUTTON_HID_POWERF;
871 break;
872 case ACPI_BUS_TYPE_SLEEP_BUTTON:
873 hid = ACPI_BUTTON_HID_SLEEPF;
874 break;
875 }
876
877 /*
878 * \_SB
879 * ----
880 * Fix for the system root bus device -- the only root-level device.
881 */
882 if ((parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
883 hid = ACPI_BUS_HID;
884 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
885 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
886 }
887
888 if (hid) {
889 strcpy(device->pnp.hardware_id, hid);
890 device->flags.hardware_id = 1;
891 }
892 if (uid) {
893 strcpy(device->pnp.unique_id, uid);
894 device->flags.unique_id = 1;
895 }
896 if (cid_list) {
897 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
898 if (device->pnp.cid_list)
899 memcpy(device->pnp.cid_list, cid_list, cid_list->size);
900 else
901 printk(KERN_ERR "Memory allocation error\n");
902 }
903
904 acpi_os_free(buffer.pointer);
905}
906
907static int acpi_device_set_context(struct acpi_device * device, int type)
908{
909 acpi_status status = AE_OK;
910 int result = 0;
911 /*
912 * Context
913 * -------
914 * Attach this 'struct acpi_device' to the ACPI object. This makes
915 * resolutions from handle->device very efficient. Note that we need
916 * to be careful with fixed-feature devices as they all attach to the
917 * root object.
918 */
919 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
920 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
921 status = acpi_attach_data(device->handle,
922 acpi_bus_data_handler, device);
923
924 if (ACPI_FAILURE(status)) {
925 printk("Error attaching device data\n");
926 result = -ENODEV;
927 }
928 }
929 return result;
930}
931
932static void acpi_device_get_debug_info(struct acpi_device * device, acpi_handle handle, int type)
933{
934#ifdef CONFIG_ACPI_DEBUG_OUTPUT
935 char *type_string = NULL;
936 char name[80] = {'?','\0'};
937 struct acpi_buffer buffer = {sizeof(name), name};
938
939 switch (type) {
940 case ACPI_BUS_TYPE_DEVICE:
941 type_string = "Device";
942 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
943 break;
944 case ACPI_BUS_TYPE_POWER:
945 type_string = "Power Resource";
946 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
947 break;
948 case ACPI_BUS_TYPE_PROCESSOR:
949 type_string = "Processor";
950 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
951 break;
952 case ACPI_BUS_TYPE_SYSTEM:
953 type_string = "System";
954 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
955 break;
956 case ACPI_BUS_TYPE_THERMAL:
957 type_string = "Thermal Zone";
958 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
959 break;
960 case ACPI_BUS_TYPE_POWER_BUTTON:
961 type_string = "Power Button";
962 sprintf(name, "PWRB");
963 break;
964 case ACPI_BUS_TYPE_SLEEP_BUTTON:
965 type_string = "Sleep Button";
966 sprintf(name, "SLPB");
967 break;
968 }
969
970 printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle);
971#endif /*CONFIG_ACPI_DEBUG_OUTPUT*/
972}
973
974
975static int
976acpi_bus_remove (
977 struct acpi_device *dev,
978 int rmdevice)
979{
980 int result = 0;
981 struct acpi_driver *driver;
982
983 ACPI_FUNCTION_TRACE("acpi_bus_remove");
984
985 if (!dev)
986 return_VALUE(-EINVAL);
987
988 driver = dev->driver;
989
990 if ((driver) && (driver->ops.remove)) {
991
992 if (driver->ops.stop) {
993 result = driver->ops.stop(dev, ACPI_BUS_REMOVAL_EJECT);
994 if (result)
995 return_VALUE(result);
996 }
997
998 result = dev->driver->ops.remove(dev, ACPI_BUS_REMOVAL_EJECT);
999 if (result) {
1000 return_VALUE(result);
1001 }
1002
1003 atomic_dec(&dev->driver->references);
1004 dev->driver = NULL;
1005 acpi_driver_data(dev) = NULL;
1006 }
1007
1008 if (!rmdevice)
1009 return_VALUE(0);
1010
1011 if (dev->flags.bus_address) {
1012 if ((dev->parent) && (dev->parent->ops.unbind))
1013 dev->parent->ops.unbind(dev);
1014 }
1015
1016 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1017
1018 return_VALUE(0);
1019}
1020
1021
3fb02738
RS		 1022static int
1023acpi_add_single_object (
1da177e4
LT		 1024 struct acpi_device **child,
1025 struct acpi_device *parent,
1026 acpi_handle handle,
1027 int type)
1028{
1029 int result = 0;
1030 struct acpi_device *device = NULL;
1031
3fb02738 1032 ACPI_FUNCTION_TRACE("acpi_add_single_object");
1da177e4
LT		 1033
1034 if (!child)
1035 return_VALUE(-EINVAL);
1036
1037 device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
1038 if (!device) {
1039 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n"));
1040 return_VALUE(-ENOMEM);
1041 }
1042 memset(device, 0, sizeof(struct acpi_device));
1043
1044 device->handle = handle;
1045 device->parent = parent;
1046
1047 acpi_device_get_busid(device,handle,type);
1048
1049 /*
1050 * Flags
1051 * -----
1052 * Get prior to calling acpi_bus_get_status() so we know whether
1053 * or not _STA is present. Note that we only look for object
1054 * handles -- cannot evaluate objects until we know the device is
1055 * present and properly initialized.
1056 */
1057 result = acpi_bus_get_flags(device);
1058 if (result)
1059 goto end;
1060
1061 /*
1062 * Status
1063 * ------
6940faba
KT		 1064 * See if the device is present. We always assume that non-Device
1065 * and non-Processor objects (e.g. thermal zones, power resources,
1066 * etc.) are present, functioning, etc. (at least when parent object
1067 * is present). Note that _STA has a different meaning for some
1068 * objects (e.g. power resources) so we need to be careful how we use
1069 * it.
1da177e4
LT		 1070 */
1071 switch (type) {
6940faba 1072 case ACPI_BUS_TYPE_PROCESSOR:
1da177e4
LT		 1073 case ACPI_BUS_TYPE_DEVICE:
1074 result = acpi_bus_get_status(device);
1075 if (ACPI_FAILURE(result) || !device->status.present) {
1076 result = -ENOENT;
1077 goto end;
1078 }
1079 break;
1080 default:
1081 STRUCT_TO_INT(device->status) = 0x0F;
1082 break;
1083 }
1084
1085 /*
1086 * Initialize Device
1087 * -----------------
1088 * TBD: Synch with Core's enumeration/initialization process.
1089 */
1090
1091 /*
1092 * Hardware ID, Unique ID, & Bus Address
1093 * -------------------------------------
1094 */
1095 acpi_device_set_id(device,parent,handle,type);
1096
1097 /*
1098 * Power Management
1099 * ----------------
1100 */
1101 if (device->flags.power_manageable) {
1102 result = acpi_bus_get_power_flags(device);
1103 if (result)
1104 goto end;
1105 }
1106
1107 /*
1108 * Wakeup device management
1109 *-----------------------
1110 */
1111 if (device->flags.wake_capable) {
1112 result = acpi_bus_get_wakeup_device_flags(device);
1113 if (result)
1114 goto end;
1115 }
1116
1117 /*
1118 * Performance Management
1119 * ----------------------
1120 */
1121 if (device->flags.performance_manageable) {
1122 result = acpi_bus_get_perf_flags(device);
1123 if (result)
1124 goto end;
1125 }
1126
1127 if ((result = acpi_device_set_context(device,type)))
1128 goto end;
1129
1130 acpi_device_get_debug_info(device,handle,type);
1131
1132 acpi_device_register(device,parent);
1133
1134 /*
1135 * Bind _ADR-Based Devices
1136 * -----------------------
1137 * If there's a a bus address (_ADR) then we utilize the parent's
1138 * 'bind' function (if exists) to bind the ACPI- and natively-
1139 * enumerated device representations.
1140 */
1141 if (device->flags.bus_address) {
1142 if (device->parent && device->parent->ops.bind)
1143 device->parent->ops.bind(device);
1144 }
1145
1146 /*
1147 * Locate & Attach Driver
1148 * ----------------------
1149 * If there's a hardware id (_HID) or compatible ids (_CID) we check
1150 * to see if there's a driver installed for this kind of device. Note
1151 * that drivers can install before or after a device is enumerated.
1152 *
1153 * TBD: Assumes LDM provides driver hot-plug capability.
1154 */
3fb02738 1155 result = acpi_bus_find_driver(device);
1da177e4
LT		 1156
1157end:
1158 if (!result)
1159 *child = device;
1160 else {
1161 if (device->pnp.cid_list)
1162 kfree(device->pnp.cid_list);
1163 kfree(device);
1164 }
1165
1166 return_VALUE(result);
1167}
1da177e4
LT		 1168
1169
3fb02738
RS		 1170static int acpi_bus_scan (struct acpi_device *start,
1171 struct acpi_bus_ops *ops)
1da177e4
LT		 1172{
1173 acpi_status status = AE_OK;
1174 struct acpi_device *parent = NULL;
1175 struct acpi_device *child = NULL;
1176 acpi_handle phandle = NULL;
1177 acpi_handle chandle = NULL;
1178 acpi_object_type type = 0;
1179 u32 level = 1;
1180
1181 ACPI_FUNCTION_TRACE("acpi_bus_scan");
1182
1183 if (!start)
1184 return_VALUE(-EINVAL);
1185
1186 parent = start;
1187 phandle = start->handle;
1188
1189 /*
1190 * Parse through the ACPI namespace, identify all 'devices', and
1191 * create a new 'struct acpi_device' for each.
1192 */
1193 while ((level > 0) && parent) {
1194
1195 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1196 chandle, &chandle);
1197
1198 /*
1199 * If this scope is exhausted then move our way back up.
1200 */
1201 if (ACPI_FAILURE(status)) {
1202 level--;
1203 chandle = phandle;
1204 acpi_get_parent(phandle, &phandle);
1205 if (parent->parent)
1206 parent = parent->parent;
1207 continue;
1208 }
1209
1210 status = acpi_get_type(chandle, &type);
1211 if (ACPI_FAILURE(status))
1212 continue;
1213
1214 /*
1215 * If this is a scope object then parse it (depth-first).
1216 */
1217 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1218 level++;
1219 phandle = chandle;
1220 chandle = NULL;
1221 continue;
1222 }
1223
1224 /*
1225 * We're only interested in objects that we consider 'devices'.
1226 */
1227 switch (type) {
1228 case ACPI_TYPE_DEVICE:
1229 type = ACPI_BUS_TYPE_DEVICE;
1230 break;
1231 case ACPI_TYPE_PROCESSOR:
1232 type = ACPI_BUS_TYPE_PROCESSOR;
1233 break;
1234 case ACPI_TYPE_THERMAL:
1235 type = ACPI_BUS_TYPE_THERMAL;
1236 break;
1237 case ACPI_TYPE_POWER:
1238 type = ACPI_BUS_TYPE_POWER;
1239 break;
1240 default:
1241 continue;
1242 }
1243
3fb02738
RS		 1244 if (ops->acpi_op_add)
1245 status = acpi_add_single_object(&child, parent,
1246 chandle, type);
1247 else
1248 status = acpi_bus_get_device(chandle, &child);
1249
1250 if (ACPI_FAILURE(status))
1251 continue;
1252
1253 if (ops->acpi_op_start) {
1254 status = acpi_start_single_object(child);
1255 if (ACPI_FAILURE(status))
1256 continue;
1257 }
1da177e4
LT		 1258
1259 /*
1260 * If the device is present, enabled, and functioning then
1261 * parse its scope (depth-first). Note that we need to
1262 * represent absent devices to facilitate PnP notifications
1263 * -- but only the subtree head (not all of its children,
1264 * which will be enumerated when the parent is inserted).
1265 *
1266 * TBD: Need notifications and other detection mechanisms
1267 * in place before we can fully implement this.
1268 */
1269 if (child->status.present) {
1270 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1271 NULL, NULL);
1272 if (ACPI_SUCCESS(status)) {
1273 level++;
1274 phandle = chandle;
1275 chandle = NULL;
1276 parent = child;
1277 }
1278 }
1279 }
1280
1281 return_VALUE(0);
1282}
1da177e4 1283
3fb02738
RS		 1284int
1285acpi_bus_add (
1286 struct acpi_device **child,
1287 struct acpi_device *parent,
1288 acpi_handle handle,
1289 int type)
1290{
1291 int result;
1292 struct acpi_bus_ops ops;
1293
1294 ACPI_FUNCTION_TRACE("acpi_bus_add");
1295
1296 result = acpi_add_single_object(child, parent, handle, type);
1297 if (!result) {
1298 memset(&ops, 0, sizeof(ops));
1299 ops.acpi_op_add = 1;
1300 result = acpi_bus_scan(*child, &ops);
1301 }
1302 return_VALUE(result);
1303}
1304EXPORT_SYMBOL(acpi_bus_add);
1305
1306int
1307acpi_bus_start (
1308 struct acpi_device *device)
1309{
1310 int result;
1311 struct acpi_bus_ops ops;
1312
1313 ACPI_FUNCTION_TRACE("acpi_bus_start");
1314
1315 if (!device)
1316 return_VALUE(-EINVAL);
1317
1318 result = acpi_start_single_object(device);
1319 if (!result) {
1320 memset(&ops, 0, sizeof(ops));
1321 ops.acpi_op_start = 1;
1322 result = acpi_bus_scan(device, &ops);
1323 }
1324 return_VALUE(result);
1325}
1326EXPORT_SYMBOL(acpi_bus_start);
1da177e4
LT		 1327
1328static int
1329acpi_bus_trim(struct acpi_device *start,
1330 int rmdevice)
1331{
1332 acpi_status status;
1333 struct acpi_device *parent, *child;
1334 acpi_handle phandle, chandle;
1335 acpi_object_type type;
1336 u32 level = 1;
1337 int err = 0;
1338
1339 parent = start;
1340 phandle = start->handle;
1341 child = chandle = NULL;
1342
1343 while ((level > 0) && parent && (!err)) {
1344 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1345 chandle, &chandle);
1346
1347 /*
1348 * If this scope is exhausted then move our way back up.
1349 */
1350 if (ACPI_FAILURE(status)) {
1351 level--;
1352 chandle = phandle;
1353 acpi_get_parent(phandle, &phandle);
1354 child = parent;
1355 parent = parent->parent;
1356
1357 if (level == 0)
1358 err = acpi_bus_remove(child, rmdevice);
1359 else
1360 err = acpi_bus_remove(child, 1);
1361
1362 continue;
1363 }
1364
1365 status = acpi_get_type(chandle, &type);
1366 if (ACPI_FAILURE(status)) {
1367 continue;
1368 }
1369 /*
1370 * If there is a device corresponding to chandle then
1371 * parse it (depth-first).
1372 */
1373 if (acpi_bus_get_device(chandle, &child) == 0) {
1374 level++;
1375 phandle = chandle;
1376 chandle = NULL;
1377 parent = child;
1378 }
1379 continue;
1380 }
1381 return err;
1382}
1383
1384static int
1385acpi_bus_scan_fixed (
1386 struct acpi_device *root)
1387{
1388 int result = 0;
1389 struct acpi_device *device = NULL;
1390
1391 ACPI_FUNCTION_TRACE("acpi_bus_scan_fixed");
1392
1393 if (!root)
1394 return_VALUE(-ENODEV);
1395
1396 /*
1397 * Enumerate all fixed-feature devices.
1398 */
3fb02738
RS		 1399 if (acpi_fadt.pwr_button == 0) {
1400 result = acpi_add_single_object(&device, acpi_root,
1da177e4 1401 NULL, ACPI_BUS_TYPE_POWER_BUTTON);
3fb02738
RS		 1402 if (!result)
1403 result = acpi_start_single_object(device);
1404 }
1da177e4 1405
3fb02738
RS		 1406 if (acpi_fadt.sleep_button == 0) {
1407 result = acpi_add_single_object(&device, acpi_root,
1da177e4 1408 NULL, ACPI_BUS_TYPE_SLEEP_BUTTON);
3fb02738
RS		 1409 if (!result)
1410 result = acpi_start_single_object(device);
1411 }
1da177e4
LT		 1412
1413 return_VALUE(result);
1414}
1415
1416
1417static int __init acpi_scan_init(void)
1418{
1419 int result;
3fb02738 1420 struct acpi_bus_ops ops;
1da177e4
LT		 1421
1422 ACPI_FUNCTION_TRACE("acpi_scan_init");
1423
1424 if (acpi_disabled)
1425 return_VALUE(0);
1426
1427 kset_register(&acpi_namespace_kset);
1428
1429 /*
1430 * Create the root device in the bus's device tree
1431 */
3fb02738 1432 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1da177e4
LT		 1433 ACPI_BUS_TYPE_SYSTEM);
1434 if (result)
1435 goto Done;
1436
3fb02738
RS		 1437 result = acpi_start_single_object(acpi_root);
1438
1da177e4
LT		 1439 /*
1440 * Enumerate devices in the ACPI namespace.
1441 */
1442 result = acpi_bus_scan_fixed(acpi_root);
3fb02738
RS		 1443 if (!result) {
1444 memset(&ops, 0, sizeof(ops));
1445 ops.acpi_op_add = 1;
1446 ops.acpi_op_start = 1;
1447 result = acpi_bus_scan(acpi_root, &ops);
1448 }
1da177e4
LT		 1449
1450 if (result)
1451 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1452
1453 Done:
1454 return_VALUE(result);
1455}
1456
1457subsys_initcall(acpi_scan_init);
Linux 6.x block layer and io_uring tree(s)