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ACPI: fix checkpatch.pl complaints in scan.c
[linux-2.6/mini2440.git] / drivers / acpi / scan.c
blob5b049cd795530a683393d1bca044ba6aa20498e4
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 #include <linux/signal.h>
10 #include <linux/kthread.h>
11
12 #include <acpi/acpi_drivers.h>
13 #include <acpi/acinterp.h> /* for acpi_ex_eisa_id_to_string() */
14
15 #define _COMPONENT ACPI_BUS_COMPONENT
16 ACPI_MODULE_NAME("scan");
17 #define STRUCT_TO_INT(s) (*((int*)&s))
18 extern struct acpi_device *acpi_root;
19
20 #define ACPI_BUS_CLASS "system_bus"
21 #define ACPI_BUS_HID "LNXSYBUS"
22 #define ACPI_BUS_DEVICE_NAME "System Bus"
23
24 static LIST_HEAD(acpi_device_list);
25 static LIST_HEAD(acpi_bus_id_list);
26 DEFINE_SPINLOCK(acpi_device_lock);
27 LIST_HEAD(acpi_wakeup_device_list);
28
29 struct acpi_device_bus_id{
30 char bus_id[15];
31 unsigned int instance_no;
32 struct list_head node;
33 };
34
35 /*
36 * Creates hid/cid(s) string needed for modalias and uevent
37 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
38 * char *modalias: "acpi:IBM0001:ACPI0001"
39 */
40 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
41 int size)
42 {
43 int len;
44 int count;
45
46 if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
47 return -ENODEV;
48
49 len = snprintf(modalias, size, "acpi:");
50 size -= len;
51
52 if (acpi_dev->flags.hardware_id) {
53 count = snprintf(&modalias[len], size, "%s:",
54 acpi_dev->pnp.hardware_id);
55 if (count < 0 || count >= size)
56 return -EINVAL;
57 len += count;
58 size -= count;
59 }
60
61 if (acpi_dev->flags.compatible_ids) {
62 struct acpi_compatible_id_list *cid_list;
63 int i;
64
65 cid_list = acpi_dev->pnp.cid_list;
66 for (i = 0; i < cid_list->count; i++) {
67 count = snprintf(&modalias[len], size, "%s:",
68 cid_list->id[i].value);
69 if (count < 0 || count >= size) {
70 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
71 acpi_dev->pnp.device_name, i);
72 break;
73 }
74 len += count;
75 size -= count;
76 }
77 }
78
79 modalias[len] = '\0';
80 return len;
81 }
82
83 static ssize_t
84 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
85 struct acpi_device *acpi_dev = to_acpi_device(dev);
86 int len;
87
88 /* Device has no HID and no CID or string is >1024 */
89 len = create_modalias(acpi_dev, buf, 1024);
90 if (len <= 0)
91 return 0;
92 buf[len++] = '\n';
93 return len;
94 }
95 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
96
97 static int acpi_bus_hot_remove_device(void *context)
98 {
99 struct acpi_device *device;
100 acpi_handle handle = context;
101 struct acpi_object_list arg_list;
102 union acpi_object arg;
103 acpi_status status = AE_OK;
104
105 if (acpi_bus_get_device(handle, &device))
106 return 0;
107
108 if (!device)
109 return 0;
110
111 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
112 "Hot-removing device %s...\n", device->dev.bus_id));
113
114
115 if (acpi_bus_trim(device, 1)) {
116 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
117 "Removing device failed\n"));
118 return -1;
119 }
120
121 /* power off device */
122 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
123 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
124 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
125 "Power-off device failed\n"));
126
127 if (device->flags.lockable) {
128 arg_list.count = 1;
129 arg_list.pointer = &arg;
130 arg.type = ACPI_TYPE_INTEGER;
131 arg.integer.value = 0;
132 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
133 }
134
135 arg_list.count = 1;
136 arg_list.pointer = &arg;
137 arg.type = ACPI_TYPE_INTEGER;
138 arg.integer.value = 1;
139
140 /*
141 * TBD: _EJD support.
142 */
143 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
144 if (ACPI_FAILURE(status))
145 return -ENODEV;
146
147 return 0;
148 }
149
150 static ssize_t
151 acpi_eject_store(struct device *d, struct device_attribute *attr,
152 const char *buf, size_t count)
153 {
154 int ret = count;
155 acpi_status status;
156 acpi_object_type type = 0;
157 struct acpi_device *acpi_device = to_acpi_device(d);
158 struct task_struct *task;
159
160 if ((!count) || (buf[0] != '1')) {
161 return -EINVAL;
162 }
163 #ifndef FORCE_EJECT
164 if (acpi_device->driver == NULL) {
165 ret = -ENODEV;
166 goto err;
167 }
168 #endif
169 status = acpi_get_type(acpi_device->handle, &type);
170 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
171 ret = -ENODEV;
172 goto err;
173 }
174
175 /* remove the device in another thread to fix the deadlock issue */
176 task = kthread_run(acpi_bus_hot_remove_device,
177 acpi_device->handle, "acpi_hot_remove_device");
178 if (IS_ERR(task))
179 ret = PTR_ERR(task);
180 err:
181 return ret;
182 }
183
184 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
185
186 static ssize_t
187 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
188 struct acpi_device *acpi_dev = to_acpi_device(dev);
189
190 return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
191 }
192 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
193
194 static ssize_t
195 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
196 struct acpi_device *acpi_dev = to_acpi_device(dev);
197 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
198 int result;
199
200 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
201 if(result)
202 goto end;
203
204 result = sprintf(buf, "%s\n", (char*)path.pointer);
205 kfree(path.pointer);
206 end:
207 return result;
208 }
209 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
210
211 static int acpi_device_setup_files(struct acpi_device *dev)
212 {
213 acpi_status status;
214 acpi_handle temp;
215 int result = 0;
216
217 /*
218 * Devices gotten from FADT don't have a "path" attribute
219 */
220 if(dev->handle) {
221 result = device_create_file(&dev->dev, &dev_attr_path);
222 if(result)
223 goto end;
224 }
225
226 if(dev->flags.hardware_id) {
227 result = device_create_file(&dev->dev, &dev_attr_hid);
228 if(result)
229 goto end;
230 }
231
232 if (dev->flags.hardware_id || dev->flags.compatible_ids){
233 result = device_create_file(&dev->dev, &dev_attr_modalias);
234 if(result)
235 goto end;
236 }
237
238 /*
239 * If device has _EJ0, 'eject' file is created that is used to trigger
240 * hot-removal function from userland.
241 */
242 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
243 if (ACPI_SUCCESS(status))
244 result = device_create_file(&dev->dev, &dev_attr_eject);
245 end:
246 return result;
247 }
248
249 static void acpi_device_remove_files(struct acpi_device *dev)
250 {
251 acpi_status status;
252 acpi_handle temp;
253
254 /*
255 * If device has _EJ0, 'eject' file is created that is used to trigger
256 * hot-removal function from userland.
257 */
258 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
259 if (ACPI_SUCCESS(status))
260 device_remove_file(&dev->dev, &dev_attr_eject);
261
262 if (dev->flags.hardware_id || dev->flags.compatible_ids)
263 device_remove_file(&dev->dev, &dev_attr_modalias);
264
265 if(dev->flags.hardware_id)
266 device_remove_file(&dev->dev, &dev_attr_hid);
267 if(dev->handle)
268 device_remove_file(&dev->dev, &dev_attr_path);
269 }
270 /* --------------------------------------------------------------------------
271 ACPI Bus operations
272 -------------------------------------------------------------------------- */
273
274 int acpi_match_device_ids(struct acpi_device *device,
275 const struct acpi_device_id *ids)
276 {
277 const struct acpi_device_id *id;
278
279 if (device->flags.hardware_id) {
280 for (id = ids; id->id[0]; id++) {
281 if (!strcmp((char*)id->id, device->pnp.hardware_id))
282 return 0;
283 }
284 }
285
286 if (device->flags.compatible_ids) {
287 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
288 int i;
289
290 for (id = ids; id->id[0]; id++) {
291 /* compare multiple _CID entries against driver ids */
292 for (i = 0; i < cid_list->count; i++) {
293 if (!strcmp((char*)id->id,
294 cid_list->id[i].value))
295 return 0;
296 }
297 }
298 }
299
300 return -ENOENT;
301 }
302 EXPORT_SYMBOL(acpi_match_device_ids);
303
304 static void acpi_device_release(struct device *dev)
305 {
306 struct acpi_device *acpi_dev = to_acpi_device(dev);
307
308 kfree(acpi_dev->pnp.cid_list);
309 kfree(acpi_dev);
310 }
311
312 static int acpi_device_suspend(struct device *dev, pm_message_t state)
313 {
314 struct acpi_device *acpi_dev = to_acpi_device(dev);
315 struct acpi_driver *acpi_drv = acpi_dev->driver;
316
317 if (acpi_drv && acpi_drv->ops.suspend)
318 return acpi_drv->ops.suspend(acpi_dev, state);
319 return 0;
320 }
321
322 static int acpi_device_resume(struct device *dev)
323 {
324 struct acpi_device *acpi_dev = to_acpi_device(dev);
325 struct acpi_driver *acpi_drv = acpi_dev->driver;
326
327 if (acpi_drv && acpi_drv->ops.resume)
328 return acpi_drv->ops.resume(acpi_dev);
329 return 0;
330 }
331
332 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
333 {
334 struct acpi_device *acpi_dev = to_acpi_device(dev);
335 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
336
337 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
338 }
339
340 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
341 {
342 struct acpi_device *acpi_dev = to_acpi_device(dev);
343 int len;
344
345 if (add_uevent_var(env, "MODALIAS="))
346 return -ENOMEM;
347 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
348 sizeof(env->buf) - env->buflen);
349 if (len >= (sizeof(env->buf) - env->buflen))
350 return -ENOMEM;
351 env->buflen += len;
352 return 0;
353 }
354
355 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
356 static int acpi_start_single_object(struct acpi_device *);
357 static int acpi_device_probe(struct device * dev)
358 {
359 struct acpi_device *acpi_dev = to_acpi_device(dev);
360 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
361 int ret;
362
363 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
364 if (!ret) {
365 if (acpi_dev->bus_ops.acpi_op_start)
366 acpi_start_single_object(acpi_dev);
367 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
368 "Found driver [%s] for device [%s]\n",
369 acpi_drv->name, acpi_dev->pnp.bus_id));
370 get_device(dev);
371 }
372 return ret;
373 }
374
375 static int acpi_device_remove(struct device * dev)
376 {
377 struct acpi_device *acpi_dev = to_acpi_device(dev);
378 struct acpi_driver *acpi_drv = acpi_dev->driver;
379
380 if (acpi_drv) {
381 if (acpi_drv->ops.stop)
382 acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
383 if (acpi_drv->ops.remove)
384 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
385 }
386 acpi_dev->driver = NULL;
387 acpi_driver_data(dev) = NULL;
388
389 put_device(dev);
390 return 0;
391 }
392
393 static void acpi_device_shutdown(struct device *dev)
394 {
395 struct acpi_device *acpi_dev = to_acpi_device(dev);
396 struct acpi_driver *acpi_drv = acpi_dev->driver;
397
398 if (acpi_drv && acpi_drv->ops.shutdown)
399 acpi_drv->ops.shutdown(acpi_dev);
400
401 return ;
402 }
403
404 struct bus_type acpi_bus_type = {
405 .name = "acpi",
406 .suspend = acpi_device_suspend,
407 .resume = acpi_device_resume,
408 .shutdown = acpi_device_shutdown,
409 .match = acpi_bus_match,
410 .probe = acpi_device_probe,
411 .remove = acpi_device_remove,
412 .uevent = acpi_device_uevent,
413 };
414
415 static int acpi_device_register(struct acpi_device *device,
416 struct acpi_device *parent)
417 {
418 int result;
419 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
420 int found = 0;
421 /*
422 * Linkage
423 * -------
424 * Link this device to its parent and siblings.
425 */
426 INIT_LIST_HEAD(&device->children);
427 INIT_LIST_HEAD(&device->node);
428 INIT_LIST_HEAD(&device->g_list);
429 INIT_LIST_HEAD(&device->wakeup_list);
430
431 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
432 if (!new_bus_id) {
433 printk(KERN_ERR PREFIX "Memory allocation error\n");
434 return -ENOMEM;
435 }
436
437 spin_lock(&acpi_device_lock);
438 /*
439 * Find suitable bus_id and instance number in acpi_bus_id_list
440 * If failed, create one and link it into acpi_bus_id_list
441 */
442 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
443 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
444 acpi_device_bus_id->instance_no ++;
445 found = 1;
446 kfree(new_bus_id);
447 break;
448 }
449 }
450 if(!found) {
451 acpi_device_bus_id = new_bus_id;
452 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
453 acpi_device_bus_id->instance_no = 0;
454 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
455 }
456 sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
457
458 if (device->parent) {
459 list_add_tail(&device->node, &device->parent->children);
460 list_add_tail(&device->g_list, &device->parent->g_list);
461 } else
462 list_add_tail(&device->g_list, &acpi_device_list);
463 if (device->wakeup.flags.valid)
464 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
465 spin_unlock(&acpi_device_lock);
466
467 if (device->parent)
468 device->dev.parent = &parent->dev;
469 device->dev.bus = &acpi_bus_type;
470 device_initialize(&device->dev);
471 device->dev.release = &acpi_device_release;
472 result = device_add(&device->dev);
473 if(result) {
474 printk(KERN_ERR PREFIX "Error adding device %s", device->dev.bus_id);
475 goto end;
476 }
477
478 result = acpi_device_setup_files(device);
479 if(result)
480 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id));
481
482 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
483 return 0;
484 end:
485 spin_lock(&acpi_device_lock);
486 if (device->parent) {
487 list_del(&device->node);
488 list_del(&device->g_list);
489 } else
490 list_del(&device->g_list);
491 list_del(&device->wakeup_list);
492 spin_unlock(&acpi_device_lock);
493 return result;
494 }
495
496 static void acpi_device_unregister(struct acpi_device *device, int type)
497 {
498 spin_lock(&acpi_device_lock);
499 if (device->parent) {
500 list_del(&device->node);
501 list_del(&device->g_list);
502 } else
503 list_del(&device->g_list);
504
505 list_del(&device->wakeup_list);
506 spin_unlock(&acpi_device_lock);
507
508 acpi_detach_data(device->handle, acpi_bus_data_handler);
509
510 acpi_device_remove_files(device);
511 device_unregister(&device->dev);
512 }
513
514 /* --------------------------------------------------------------------------
515 Driver Management
516 -------------------------------------------------------------------------- */
517 /**
518 * acpi_bus_driver_init - add a device to a driver
519 * @device: the device to add and initialize
520 * @driver: driver for the device
521 *
522 * Used to initialize a device via its device driver. Called whenever a
523 * driver is bound to a device. Invokes the driver's add() ops.
524 */
525 static int
526 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
527 {
528 int result = 0;
529
530
531 if (!device || !driver)
532 return -EINVAL;
533
534 if (!driver->ops.add)
535 return -ENOSYS;
536
537 result = driver->ops.add(device);
538 if (result) {
539 device->driver = NULL;
540 acpi_driver_data(device) = NULL;
541 return result;
542 }
543
544 device->driver = driver;
545
546 /*
547 * TBD - Configuration Management: Assign resources to device based
548 * upon possible configuration and currently allocated resources.
549 */
550
551 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
552 "Driver successfully bound to device\n"));
553 return 0;
554 }
555
556 static int acpi_start_single_object(struct acpi_device *device)
557 {
558 int result = 0;
559 struct acpi_driver *driver;
560
561
562 if (!(driver = device->driver))
563 return 0;
564
565 if (driver->ops.start) {
566 result = driver->ops.start(device);
567 if (result && driver->ops.remove)
568 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
569 }
570
571 return result;
572 }
573
574 /**
575 * acpi_bus_register_driver - register a driver with the ACPI bus
576 * @driver: driver being registered
577 *
578 * Registers a driver with the ACPI bus. Searches the namespace for all
579 * devices that match the driver's criteria and binds. Returns zero for
580 * success or a negative error status for failure.
581 */
582 int acpi_bus_register_driver(struct acpi_driver *driver)
583 {
584 int ret;
585
586 if (acpi_disabled)
587 return -ENODEV;
588 driver->drv.name = driver->name;
589 driver->drv.bus = &acpi_bus_type;
590 driver->drv.owner = driver->owner;
591
592 ret = driver_register(&driver->drv);
593 return ret;
594 }
595
596 EXPORT_SYMBOL(acpi_bus_register_driver);
597
598 /**
599 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
600 * @driver: driver to unregister
601 *
602 * Unregisters a driver with the ACPI bus. Searches the namespace for all
603 * devices that match the driver's criteria and unbinds.
604 */
605 void acpi_bus_unregister_driver(struct acpi_driver *driver)
606 {
607 driver_unregister(&driver->drv);
608 }
609
610 EXPORT_SYMBOL(acpi_bus_unregister_driver);
611
612 /* --------------------------------------------------------------------------
613 Device Enumeration
614 -------------------------------------------------------------------------- */
615 acpi_status
616 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
617 {
618 acpi_status status;
619 acpi_handle tmp;
620 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
621 union acpi_object *obj;
622
623 status = acpi_get_handle(handle, "_EJD", &tmp);
624 if (ACPI_FAILURE(status))
625 return status;
626
627 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
628 if (ACPI_SUCCESS(status)) {
629 obj = buffer.pointer;
630 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
631 ejd);
632 kfree(buffer.pointer);
633 }
634 return status;
635 }
636 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
637
638 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
639 {
640
641 /* TBD */
642
643 return;
644 }
645
646 static int acpi_bus_get_perf_flags(struct acpi_device *device)
647 {
648 device->performance.state = ACPI_STATE_UNKNOWN;
649 return 0;
650 }
651
652 static acpi_status
653 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
654 union acpi_object *package)
655 {
656 int i = 0;
657 union acpi_object *element = NULL;
658
659 if (!device || !package || (package->package.count < 2))
660 return AE_BAD_PARAMETER;
661
662 element = &(package->package.elements[0]);
663 if (!element)
664 return AE_BAD_PARAMETER;
665 if (element->type == ACPI_TYPE_PACKAGE) {
666 if ((element->package.count < 2) ||
667 (element->package.elements[0].type !=
668 ACPI_TYPE_LOCAL_REFERENCE)
669 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
670 return AE_BAD_DATA;
671 device->wakeup.gpe_device =
672 element->package.elements[0].reference.handle;
673 device->wakeup.gpe_number =
674 (u32) element->package.elements[1].integer.value;
675 } else if (element->type == ACPI_TYPE_INTEGER) {
676 device->wakeup.gpe_number = element->integer.value;
677 } else
678 return AE_BAD_DATA;
679
680 element = &(package->package.elements[1]);
681 if (element->type != ACPI_TYPE_INTEGER) {
682 return AE_BAD_DATA;
683 }
684 device->wakeup.sleep_state = element->integer.value;
685
686 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
687 return AE_NO_MEMORY;
688 }
689 device->wakeup.resources.count = package->package.count - 2;
690 for (i = 0; i < device->wakeup.resources.count; i++) {
691 element = &(package->package.elements[i + 2]);
692 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
693 return AE_BAD_DATA;
694
695 device->wakeup.resources.handles[i] = element->reference.handle;
696 }
697
698 return AE_OK;
699 }
700
701 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
702 {
703 acpi_status status = 0;
704 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
705 union acpi_object *package = NULL;
706 union acpi_object in_arg[3];
707 struct acpi_object_list arg_list = { 3, in_arg };
708 acpi_status psw_status = AE_OK;
709
710 struct acpi_device_id button_device_ids[] = {
711 {"PNP0C0D", 0},
712 {"PNP0C0C", 0},
713 {"PNP0C0E", 0},
714 {"", 0},
715 };
716
717 /* _PRW */
718 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
719 if (ACPI_FAILURE(status)) {
720 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
721 goto end;
722 }
723
724 package = (union acpi_object *)buffer.pointer;
725 status = acpi_bus_extract_wakeup_device_power_package(device, package);
726 if (ACPI_FAILURE(status)) {
727 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
728 goto end;
729 }
730
731 kfree(buffer.pointer);
732
733 device->wakeup.flags.valid = 1;
734 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
735 * system for the ACPI device with the _PRW object.
736 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
737 * So it is necessary to call _DSW object first. Only when it is not
738 * present will the _PSW object used.
739 */
740 /*
741 * Three agruments are needed for the _DSW object.
742 * Argument 0: enable/disable the wake capabilities
743 * When _DSW object is called to disable the wake capabilities, maybe
744 * the first argument is filled. The value of the other two agruments
745 * is meaningless.
746 */
747 in_arg[0].type = ACPI_TYPE_INTEGER;
748 in_arg[0].integer.value = 0;
749 in_arg[1].type = ACPI_TYPE_INTEGER;
750 in_arg[1].integer.value = 0;
751 in_arg[2].type = ACPI_TYPE_INTEGER;
752 in_arg[2].integer.value = 0;
753 psw_status = acpi_evaluate_object(device->handle, "_DSW",
754 &arg_list, NULL);
755 if (ACPI_FAILURE(psw_status) && (psw_status != AE_NOT_FOUND))
756 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "error in evaluate _DSW\n"));
757 /*
758 * When the _DSW object is not present, OSPM will call _PSW object.
759 */
760 if (psw_status == AE_NOT_FOUND) {
761 /*
762 * Only one agruments is required for the _PSW object.
763 * agrument 0: enable/disable the wake capabilities
764 */
765 arg_list.count = 1;
766 in_arg[0].integer.value = 0;
767 psw_status = acpi_evaluate_object(device->handle, "_PSW",
768 &arg_list, NULL);
769 if (ACPI_FAILURE(psw_status) && (psw_status != AE_NOT_FOUND))
770 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "error in "
771 "evaluate _PSW\n"));
772 }
773 /* Power button, Lid switch always enable wakeup */
774 if (!acpi_match_device_ids(device, button_device_ids))
775 device->wakeup.flags.run_wake = 1;
776
777 end:
778 if (ACPI_FAILURE(status))
779 device->flags.wake_capable = 0;
780 return 0;
781 }
782
783 static int acpi_bus_get_power_flags(struct acpi_device *device)
784 {
785 acpi_status status = 0;
786 acpi_handle handle = NULL;
787 u32 i = 0;
788
789
790 /*
791 * Power Management Flags
792 */
793 status = acpi_get_handle(device->handle, "_PSC", &handle);
794 if (ACPI_SUCCESS(status))
795 device->power.flags.explicit_get = 1;
796 status = acpi_get_handle(device->handle, "_IRC", &handle);
797 if (ACPI_SUCCESS(status))
798 device->power.flags.inrush_current = 1;
799
800 /*
801 * Enumerate supported power management states
802 */
803 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
804 struct acpi_device_power_state *ps = &device->power.states[i];
805 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
806
807 /* Evaluate "_PRx" to se if power resources are referenced */
808 acpi_evaluate_reference(device->handle, object_name, NULL,
809 &ps->resources);
810 if (ps->resources.count) {
811 device->power.flags.power_resources = 1;
812 ps->flags.valid = 1;
813 }
814
815 /* Evaluate "_PSx" to see if we can do explicit sets */
816 object_name[2] = 'S';
817 status = acpi_get_handle(device->handle, object_name, &handle);
818 if (ACPI_SUCCESS(status)) {
819 ps->flags.explicit_set = 1;
820 ps->flags.valid = 1;
821 }
822
823 /* State is valid if we have some power control */
824 if (ps->resources.count || ps->flags.explicit_set)
825 ps->flags.valid = 1;
826
827 ps->power = -1; /* Unknown - driver assigned */
828 ps->latency = -1; /* Unknown - driver assigned */
829 }
830
831 /* Set defaults for D0 and D3 states (always valid) */
832 device->power.states[ACPI_STATE_D0].flags.valid = 1;
833 device->power.states[ACPI_STATE_D0].power = 100;
834 device->power.states[ACPI_STATE_D3].flags.valid = 1;
835 device->power.states[ACPI_STATE_D3].power = 0;
836
837 /* TBD: System wake support and resource requirements. */
838
839 device->power.state = ACPI_STATE_UNKNOWN;
840
841 return 0;
842 }
843
844 static int acpi_bus_get_flags(struct acpi_device *device)
845 {
846 acpi_status status = AE_OK;
847 acpi_handle temp = NULL;
848
849
850 /* Presence of _STA indicates 'dynamic_status' */
851 status = acpi_get_handle(device->handle, "_STA", &temp);
852 if (ACPI_SUCCESS(status))
853 device->flags.dynamic_status = 1;
854
855 /* Presence of _CID indicates 'compatible_ids' */
856 status = acpi_get_handle(device->handle, "_CID", &temp);
857 if (ACPI_SUCCESS(status))
858 device->flags.compatible_ids = 1;
859
860 /* Presence of _RMV indicates 'removable' */
861 status = acpi_get_handle(device->handle, "_RMV", &temp);
862 if (ACPI_SUCCESS(status))
863 device->flags.removable = 1;
864
865 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
866 status = acpi_get_handle(device->handle, "_EJD", &temp);
867 if (ACPI_SUCCESS(status))
868 device->flags.ejectable = 1;
869 else {
870 status = acpi_get_handle(device->handle, "_EJ0", &temp);
871 if (ACPI_SUCCESS(status))
872 device->flags.ejectable = 1;
873 }
874
875 /* Presence of _LCK indicates 'lockable' */
876 status = acpi_get_handle(device->handle, "_LCK", &temp);
877 if (ACPI_SUCCESS(status))
878 device->flags.lockable = 1;
879
880 /* Presence of _PS0|_PR0 indicates 'power manageable' */
881 status = acpi_get_handle(device->handle, "_PS0", &temp);
882 if (ACPI_FAILURE(status))
883 status = acpi_get_handle(device->handle, "_PR0", &temp);
884 if (ACPI_SUCCESS(status))
885 device->flags.power_manageable = 1;
886
887 /* Presence of _PRW indicates wake capable */
888 status = acpi_get_handle(device->handle, "_PRW", &temp);
889 if (ACPI_SUCCESS(status))
890 device->flags.wake_capable = 1;
891
892 /* TBD: Performance management */
893
894 return 0;
895 }
896
897 static void acpi_device_get_busid(struct acpi_device *device,
898 acpi_handle handle, int type)
899 {
900 char bus_id[5] = { '?', 0 };
901 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
902 int i = 0;
903
904 /*
905 * Bus ID
906 * ------
907 * The device's Bus ID is simply the object name.
908 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
909 */
910 switch (type) {
911 case ACPI_BUS_TYPE_SYSTEM:
912 strcpy(device->pnp.bus_id, "ACPI");
913 break;
914 case ACPI_BUS_TYPE_POWER_BUTTON:
915 strcpy(device->pnp.bus_id, "PWRF");
916 break;
917 case ACPI_BUS_TYPE_SLEEP_BUTTON:
918 strcpy(device->pnp.bus_id, "SLPF");
919 break;
920 default:
921 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
922 /* Clean up trailing underscores (if any) */
923 for (i = 3; i > 1; i--) {
924 if (bus_id[i] == '_')
925 bus_id[i] = '\0';
926 else
927 break;
928 }
929 strcpy(device->pnp.bus_id, bus_id);
930 break;
931 }
932 }
933
934 static int
935 acpi_video_bus_match(struct acpi_device *device)
936 {
937 acpi_handle h_dummy;
938
939 if (!device)
940 return -EINVAL;
941
942 /* Since there is no HID, CID for ACPI Video drivers, we have
943 * to check well known required nodes for each feature we support.
944 */
945
946 /* Does this device able to support video switching ? */
947 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) &&
948 ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy)))
949 return 0;
950
951 /* Does this device able to retrieve a video ROM ? */
952 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy)))
953 return 0;
954
955 /* Does this device able to configure which video head to be POSTed ? */
956 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy)) &&
957 ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy)) &&
958 ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy)))
959 return 0;
960
961 return -ENODEV;
962 }
963
964 /*
965 * acpi_bay_match - see if a device is an ejectable driver bay
966 *
967 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
968 * then we can safely call it an ejectable drive bay
969 */
970 static int acpi_bay_match(struct acpi_device *device){
971 acpi_status status;
972 acpi_handle handle;
973 acpi_handle tmp;
974 acpi_handle phandle;
975
976 handle = device->handle;
977
978 status = acpi_get_handle(handle, "_EJ0", &tmp);
979 if (ACPI_FAILURE(status))
980 return -ENODEV;
981
982 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
983 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
984 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
985 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
986 return 0;
987
988 if (acpi_get_parent(handle, &phandle))
989 return -ENODEV;
990
991 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
992 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
993 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
994 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
995 return 0;
996
997 return -ENODEV;
998 }
999
1000 /*
1001 * acpi_dock_match - see if a device has a _DCK method
1002 */
1003 static int acpi_dock_match(struct acpi_device *device)
1004 {
1005 acpi_handle tmp;
1006 return acpi_get_handle(device->handle, "_DCK", &tmp);
1007 }
1008
1009 static void acpi_device_set_id(struct acpi_device *device,
1010 struct acpi_device *parent, acpi_handle handle,
1011 int type)
1012 {
1013 struct acpi_device_info *info;
1014 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1015 char *hid = NULL;
1016 char *uid = NULL;
1017 struct acpi_compatible_id_list *cid_list = NULL;
1018 const char *cid_add = NULL;
1019 acpi_status status;
1020
1021 switch (type) {
1022 case ACPI_BUS_TYPE_DEVICE:
1023 status = acpi_get_object_info(handle, &buffer);
1024 if (ACPI_FAILURE(status)) {
1025 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1026 return;
1027 }
1028
1029 info = buffer.pointer;
1030 if (info->valid & ACPI_VALID_HID)
1031 hid = info->hardware_id.value;
1032 if (info->valid & ACPI_VALID_UID)
1033 uid = info->unique_id.value;
1034 if (info->valid & ACPI_VALID_CID)
1035 cid_list = &info->compatibility_id;
1036 if (info->valid & ACPI_VALID_ADR) {
1037 device->pnp.bus_address = info->address;
1038 device->flags.bus_address = 1;
1039 }
1040
1041 /* If we have a video/bay/dock device, add our selfdefined
1042 HID to the CID list. Like that the video/bay/dock drivers
1043 will get autoloaded and the device might still match
1044 against another driver.
1045 */
1046 if (ACPI_SUCCESS(acpi_video_bus_match(device)))
1047 cid_add = ACPI_VIDEO_HID;
1048 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1049 cid_add = ACPI_BAY_HID;
1050 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1051 cid_add = ACPI_DOCK_HID;
1052
1053 break;
1054 case ACPI_BUS_TYPE_POWER:
1055 hid = ACPI_POWER_HID;
1056 break;
1057 case ACPI_BUS_TYPE_PROCESSOR:
1058 hid = ACPI_PROCESSOR_HID;
1059 break;
1060 case ACPI_BUS_TYPE_SYSTEM:
1061 hid = ACPI_SYSTEM_HID;
1062 break;
1063 case ACPI_BUS_TYPE_THERMAL:
1064 hid = ACPI_THERMAL_HID;
1065 break;
1066 case ACPI_BUS_TYPE_POWER_BUTTON:
1067 hid = ACPI_BUTTON_HID_POWERF;
1068 break;
1069 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1070 hid = ACPI_BUTTON_HID_SLEEPF;
1071 break;
1072 }
1073
1074 /*
1075 * \_SB
1076 * ----
1077 * Fix for the system root bus device -- the only root-level device.
1078 */
1079 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1080 hid = ACPI_BUS_HID;
1081 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1082 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1083 }
1084
1085 if (hid) {
1086 strcpy(device->pnp.hardware_id, hid);
1087 device->flags.hardware_id = 1;
1088 }
1089 if (uid) {
1090 strcpy(device->pnp.unique_id, uid);
1091 device->flags.unique_id = 1;
1092 }
1093 if (cid_list || cid_add) {
1094 struct acpi_compatible_id_list *list;
1095 int size = 0;
1096 int count = 0;
1097
1098 if (cid_list) {
1099 size = cid_list->size;
1100 } else if (cid_add) {
1101 size = sizeof(struct acpi_compatible_id_list);
1102 cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1103 if (!cid_list) {
1104 printk(KERN_ERR "Memory allocation error\n");
1105 kfree(buffer.pointer);
1106 return;
1107 } else {
1108 cid_list->count = 0;
1109 cid_list->size = size;
1110 }
1111 }
1112 if (cid_add)
1113 size += sizeof(struct acpi_compatible_id);
1114 list = kmalloc(size, GFP_KERNEL);
1115
1116 if (list) {
1117 if (cid_list) {
1118 memcpy(list, cid_list, cid_list->size);
1119 count = cid_list->count;
1120 }
1121 if (cid_add) {
1122 strncpy(list->id[count].value, cid_add,
1123 ACPI_MAX_CID_LENGTH);
1124 count++;
1125 device->flags.compatible_ids = 1;
1126 }
1127 list->size = size;
1128 list->count = count;
1129 device->pnp.cid_list = list;
1130 } else
1131 printk(KERN_ERR PREFIX "Memory allocation error\n");
1132 }
1133
1134 kfree(buffer.pointer);
1135 }
1136
1137 static int acpi_device_set_context(struct acpi_device *device, int type)
1138 {
1139 acpi_status status = AE_OK;
1140 int result = 0;
1141 /*
1142 * Context
1143 * -------
1144 * Attach this 'struct acpi_device' to the ACPI object. This makes
1145 * resolutions from handle->device very efficient. Note that we need
1146 * to be careful with fixed-feature devices as they all attach to the
1147 * root object.
1148 */
1149 if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1150 type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1151 status = acpi_attach_data(device->handle,
1152 acpi_bus_data_handler, device);
1153
1154 if (ACPI_FAILURE(status)) {
1155 printk(KERN_ERR PREFIX "Error attaching device data\n");
1156 result = -ENODEV;
1157 }
1158 }
1159 return result;
1160 }
1161
1162 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1163 {
1164 if (!dev)
1165 return -EINVAL;
1166
1167 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1168 device_release_driver(&dev->dev);
1169
1170 if (!rmdevice)
1171 return 0;
1172
1173 /*
1174 * unbind _ADR-Based Devices when hot removal
1175 */
1176 if (dev->flags.bus_address) {
1177 if ((dev->parent) && (dev->parent->ops.unbind))
1178 dev->parent->ops.unbind(dev);
1179 }
1180 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1181
1182 return 0;
1183 }
1184
1185 static int
1186 acpi_is_child_device(struct acpi_device *device,
1187 int (*matcher)(struct acpi_device *))
1188 {
1189 int result = -ENODEV;
1190
1191 do {
1192 if (ACPI_SUCCESS(matcher(device)))
1193 return AE_OK;
1194 } while ((device = device->parent));
1195
1196 return result;
1197 }
1198
1199 static int
1200 acpi_add_single_object(struct acpi_device **child,
1201 struct acpi_device *parent, acpi_handle handle, int type,
1202 struct acpi_bus_ops *ops)
1203 {
1204 int result = 0;
1205 struct acpi_device *device = NULL;
1206
1207
1208 if (!child)
1209 return -EINVAL;
1210
1211 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1212 if (!device) {
1213 printk(KERN_ERR PREFIX "Memory allocation error\n");
1214 return -ENOMEM;
1215 }
1216
1217 device->handle = handle;
1218 device->parent = parent;
1219 device->bus_ops = *ops; /* workround for not call .start */
1220
1221
1222 acpi_device_get_busid(device, handle, type);
1223
1224 /*
1225 * Flags
1226 * -----
1227 * Get prior to calling acpi_bus_get_status() so we know whether
1228 * or not _STA is present. Note that we only look for object
1229 * handles -- cannot evaluate objects until we know the device is
1230 * present and properly initialized.
1231 */
1232 result = acpi_bus_get_flags(device);
1233 if (result)
1234 goto end;
1235
1236 /*
1237 * Status
1238 * ------
1239 * See if the device is present. We always assume that non-Device
1240 * and non-Processor objects (e.g. thermal zones, power resources,
1241 * etc.) are present, functioning, etc. (at least when parent object
1242 * is present). Note that _STA has a different meaning for some
1243 * objects (e.g. power resources) so we need to be careful how we use
1244 * it.
1245 */
1246 switch (type) {
1247 case ACPI_BUS_TYPE_PROCESSOR:
1248 case ACPI_BUS_TYPE_DEVICE:
1249 result = acpi_bus_get_status(device);
1250 if (ACPI_FAILURE(result)) {
1251 result = -ENODEV;
1252 goto end;
1253 }
1254 if (!device->status.present) {
1255 /* Bay and dock should be handled even if absent */
1256 if (!ACPI_SUCCESS(
1257 acpi_is_child_device(device, acpi_bay_match)) &&
1258 !ACPI_SUCCESS(
1259 acpi_is_child_device(device, acpi_dock_match))) {
1260 result = -ENODEV;
1261 goto end;
1262 }
1263 }
1264 break;
1265 default:
1266 STRUCT_TO_INT(device->status) =
1267 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1268 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
1269 break;
1270 }
1271
1272 /*
1273 * Initialize Device
1274 * -----------------
1275 * TBD: Synch with Core's enumeration/initialization process.
1276 */
1277
1278 /*
1279 * Hardware ID, Unique ID, & Bus Address
1280 * -------------------------------------
1281 */
1282 acpi_device_set_id(device, parent, handle, type);
1283
1284 /*
1285 * Power Management
1286 * ----------------
1287 */
1288 if (device->flags.power_manageable) {
1289 result = acpi_bus_get_power_flags(device);
1290 if (result)
1291 goto end;
1292 }
1293
1294 /*
1295 * Wakeup device management
1296 *-----------------------
1297 */
1298 if (device->flags.wake_capable) {
1299 result = acpi_bus_get_wakeup_device_flags(device);
1300 if (result)
1301 goto end;
1302 }
1303
1304 /*
1305 * Performance Management
1306 * ----------------------
1307 */
1308 if (device->flags.performance_manageable) {
1309 result = acpi_bus_get_perf_flags(device);
1310 if (result)
1311 goto end;
1312 }
1313
1314 if ((result = acpi_device_set_context(device, type)))
1315 goto end;
1316
1317 result = acpi_device_register(device, parent);
1318
1319 /*
1320 * Bind _ADR-Based Devices when hot add
1321 */
1322 if (device->flags.bus_address) {
1323 if (device->parent && device->parent->ops.bind)
1324 device->parent->ops.bind(device);
1325 }
1326
1327 end:
1328 if (!result)
1329 *child = device;
1330 else {
1331 kfree(device->pnp.cid_list);
1332 kfree(device);
1333 }
1334
1335 return result;
1336 }
1337
1338 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1339 {
1340 acpi_status status = AE_OK;
1341 struct acpi_device *parent = NULL;
1342 struct acpi_device *child = NULL;
1343 acpi_handle phandle = NULL;
1344 acpi_handle chandle = NULL;
1345 acpi_object_type type = 0;
1346 u32 level = 1;
1347
1348
1349 if (!start)
1350 return -EINVAL;
1351
1352 parent = start;
1353 phandle = start->handle;
1354
1355 /*
1356 * Parse through the ACPI namespace, identify all 'devices', and
1357 * create a new 'struct acpi_device' for each.
1358 */
1359 while ((level > 0) && parent) {
1360
1361 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1362 chandle, &chandle);
1363
1364 /*
1365 * If this scope is exhausted then move our way back up.
1366 */
1367 if (ACPI_FAILURE(status)) {
1368 level--;
1369 chandle = phandle;
1370 acpi_get_parent(phandle, &phandle);
1371 if (parent->parent)
1372 parent = parent->parent;
1373 continue;
1374 }
1375
1376 status = acpi_get_type(chandle, &type);
1377 if (ACPI_FAILURE(status))
1378 continue;
1379
1380 /*
1381 * If this is a scope object then parse it (depth-first).
1382 */
1383 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1384 level++;
1385 phandle = chandle;
1386 chandle = NULL;
1387 continue;
1388 }
1389
1390 /*
1391 * We're only interested in objects that we consider 'devices'.
1392 */
1393 switch (type) {
1394 case ACPI_TYPE_DEVICE:
1395 type = ACPI_BUS_TYPE_DEVICE;
1396 break;
1397 case ACPI_TYPE_PROCESSOR:
1398 type = ACPI_BUS_TYPE_PROCESSOR;
1399 break;
1400 case ACPI_TYPE_THERMAL:
1401 type = ACPI_BUS_TYPE_THERMAL;
1402 break;
1403 case ACPI_TYPE_POWER:
1404 type = ACPI_BUS_TYPE_POWER;
1405 break;
1406 default:
1407 continue;
1408 }
1409
1410 if (ops->acpi_op_add)
1411 status = acpi_add_single_object(&child, parent,
1412 chandle, type, ops);
1413 else
1414 status = acpi_bus_get_device(chandle, &child);
1415
1416 if (ACPI_FAILURE(status))
1417 continue;
1418
1419 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1420 status = acpi_start_single_object(child);
1421 if (ACPI_FAILURE(status))
1422 continue;
1423 }
1424
1425 /*
1426 * If the device is present, enabled, and functioning then
1427 * parse its scope (depth-first). Note that we need to
1428 * represent absent devices to facilitate PnP notifications
1429 * -- but only the subtree head (not all of its children,
1430 * which will be enumerated when the parent is inserted).
1431 *
1432 * TBD: Need notifications and other detection mechanisms
1433 * in place before we can fully implement this.
1434 */
1435 if (child->status.present) {
1436 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1437 NULL, NULL);
1438 if (ACPI_SUCCESS(status)) {
1439 level++;
1440 phandle = chandle;
1441 chandle = NULL;
1442 parent = child;
1443 }
1444 }
1445 }
1446
1447 return 0;
1448 }
1449
1450 int
1451 acpi_bus_add(struct acpi_device **child,
1452 struct acpi_device *parent, acpi_handle handle, int type)
1453 {
1454 int result;
1455 struct acpi_bus_ops ops;
1456
1457 memset(&ops, 0, sizeof(ops));
1458 ops.acpi_op_add = 1;
1459
1460 result = acpi_add_single_object(child, parent, handle, type, &ops);
1461 if (!result)
1462 result = acpi_bus_scan(*child, &ops);
1463
1464 return result;
1465 }
1466
1467 EXPORT_SYMBOL(acpi_bus_add);
1468
1469 int acpi_bus_start(struct acpi_device *device)
1470 {
1471 int result;
1472 struct acpi_bus_ops ops;
1473
1474
1475 if (!device)
1476 return -EINVAL;
1477
1478 result = acpi_start_single_object(device);
1479 if (!result) {
1480 memset(&ops, 0, sizeof(ops));
1481 ops.acpi_op_start = 1;
1482 result = acpi_bus_scan(device, &ops);
1483 }
1484 return result;
1485 }
1486
1487 EXPORT_SYMBOL(acpi_bus_start);
1488
1489 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1490 {
1491 acpi_status status;
1492 struct acpi_device *parent, *child;
1493 acpi_handle phandle, chandle;
1494 acpi_object_type type;
1495 u32 level = 1;
1496 int err = 0;
1497
1498 parent = start;
1499 phandle = start->handle;
1500 child = chandle = NULL;
1501
1502 while ((level > 0) && parent && (!err)) {
1503 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1504 chandle, &chandle);
1505
1506 /*
1507 * If this scope is exhausted then move our way back up.
1508 */
1509 if (ACPI_FAILURE(status)) {
1510 level--;
1511 chandle = phandle;
1512 acpi_get_parent(phandle, &phandle);
1513 child = parent;
1514 parent = parent->parent;
1515
1516 if (level == 0)
1517 err = acpi_bus_remove(child, rmdevice);
1518 else
1519 err = acpi_bus_remove(child, 1);
1520
1521 continue;
1522 }
1523
1524 status = acpi_get_type(chandle, &type);
1525 if (ACPI_FAILURE(status)) {
1526 continue;
1527 }
1528 /*
1529 * If there is a device corresponding to chandle then
1530 * parse it (depth-first).
1531 */
1532 if (acpi_bus_get_device(chandle, &child) == 0) {
1533 level++;
1534 phandle = chandle;
1535 chandle = NULL;
1536 parent = child;
1537 }
1538 continue;
1539 }
1540 return err;
1541 }
1542 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1543
1544
1545 static int acpi_bus_scan_fixed(struct acpi_device *root)
1546 {
1547 int result = 0;
1548 struct acpi_device *device = NULL;
1549 struct acpi_bus_ops ops;
1550
1551 if (!root)
1552 return -ENODEV;
1553
1554 memset(&ops, 0, sizeof(ops));
1555 ops.acpi_op_add = 1;
1556 ops.acpi_op_start = 1;
1557
1558 /*
1559 * Enumerate all fixed-feature devices.
1560 */
1561 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1562 result = acpi_add_single_object(&device, acpi_root,
1563 NULL,
1564 ACPI_BUS_TYPE_POWER_BUTTON,
1565 &ops);
1566 }
1567
1568 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1569 result = acpi_add_single_object(&device, acpi_root,
1570 NULL,
1571 ACPI_BUS_TYPE_SLEEP_BUTTON,
1572 &ops);
1573 }
1574
1575 return result;
1576 }
1577
1578 int __init acpi_boot_ec_enable(void);
1579
1580 static int __init acpi_scan_init(void)
1581 {
1582 int result;
1583 struct acpi_bus_ops ops;
1584
1585
1586 if (acpi_disabled)
1587 return 0;
1588
1589 memset(&ops, 0, sizeof(ops));
1590 ops.acpi_op_add = 1;
1591 ops.acpi_op_start = 1;
1592
1593 result = bus_register(&acpi_bus_type);
1594 if (result) {
1595 /* We don't want to quit even if we failed to add suspend/resume */
1596 printk(KERN_ERR PREFIX "Could not register bus type\n");
1597 }
1598
1599 /*
1600 * Create the root device in the bus's device tree
1601 */
1602 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1603 ACPI_BUS_TYPE_SYSTEM, &ops);
1604 if (result)
1605 goto Done;
1606
1607 /*
1608 * Enumerate devices in the ACPI namespace.
1609 */
1610 result = acpi_bus_scan_fixed(acpi_root);
1611
1612 /* EC region might be needed at bus_scan, so enable it now */
1613 acpi_boot_ec_enable();
1614
1615 if (!result)
1616 result = acpi_bus_scan(acpi_root, &ops);
1617
1618 if (result)
1619 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1620
1621 Done:
1622 return result;
1623 }
1624
1625 subsys_initcall(acpi_scan_init);
Support for the Chinese Samsung S3C2440 based development boards