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Merge tag 'arm64-stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas...
[linux-block.git] / drivers / acpi / scan.c
CommitLineData
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>
5a0e3ad6 7#include <linux/slab.h>
9b6d97b6 8#include <linux/kernel.h>
1da177e4 9#include <linux/acpi.h>
74523c90
AK		 10#include <linux/signal.h>
11#include <linux/kthread.h>
222e82ac 12#include <linux/dmi.h>
d1efe3c3 13#include <linux/nls.h>
1da177e4
LT		 14
15#include <acpi/acpi_drivers.h>
1da177e4 16
e60cc7a6
BH		 17#include "internal.h"
18
1da177e4 19#define _COMPONENT ACPI_BUS_COMPONENT
f52fd66d 20ACPI_MODULE_NAME("scan");
1da177e4 21#define STRUCT_TO_INT(s) (*((int*)&s))
4be44fcd 22extern struct acpi_device *acpi_root;
1da177e4
LT		 23
24#define ACPI_BUS_CLASS "system_bus"
29b71a1c 25#define ACPI_BUS_HID "LNXSYBUS"
1da177e4
LT		 26#define ACPI_BUS_DEVICE_NAME "System Bus"
27
859ac9a4
BH		 28#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
29
683058e3
RW		 30/*
31 * If set, devices will be hot-removed even if they cannot be put offline
32 * gracefully (from the kernel's standpoint).
33 */
34bool acpi_force_hot_remove;
35
620e112c 36static const char *dummy_hid = "device";
2b2ae7c7 37
e49bd2dd 38static LIST_HEAD(acpi_bus_id_list);
c511cc19 39static DEFINE_MUTEX(acpi_scan_lock);
ca589f94 40static LIST_HEAD(acpi_scan_handlers_list);
9090589d 41DEFINE_MUTEX(acpi_device_lock);
1da177e4
LT		 42LIST_HEAD(acpi_wakeup_device_list);
43
e49bd2dd 44struct acpi_device_bus_id{
bb095854 45 char bus_id[15];
e49bd2dd
ZR		 46 unsigned int instance_no;
47 struct list_head node;
1da177e4 48};
29b71a1c 49
3757b948
RW		 50void acpi_scan_lock_acquire(void)
51{
52 mutex_lock(&acpi_scan_lock);
53}
54EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
55
56void acpi_scan_lock_release(void)
57{
58 mutex_unlock(&acpi_scan_lock);
59}
60EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
61
ca589f94
RW		 62int acpi_scan_add_handler(struct acpi_scan_handler *handler)
63{
64 if (!handler || !handler->attach)
65 return -EINVAL;
66
67 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
68 return 0;
69}
70
3f8055c3
RW		 71int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
72 const char *hotplug_profile_name)
73{
74 int error;
75
76 error = acpi_scan_add_handler(handler);
77 if (error)
78 return error;
79
80 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
81 return 0;
82}
83
29b71a1c
TR		 84/*
85 * Creates hid/cid(s) string needed for modalias and uevent
86 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
87 * char *modalias: "acpi:IBM0001:ACPI0001"
88*/
b3e572d2
AB		 89static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
90 int size)
91{
29b71a1c 92 int len;
5c9fcb5d 93 int count;
7f47fa6c 94 struct acpi_hardware_id *id;
29b71a1c 95
2b2ae7c7
TR		 96 if (list_empty(&acpi_dev->pnp.ids))
97 return 0;
98
5c9fcb5d 99 len = snprintf(modalias, size, "acpi:");
29b71a1c
TR		 100 size -= len;
101
7f47fa6c
BH		 102 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
103 count = snprintf(&modalias[len], size, "%s:", id->id);
5c9fcb5d
ZR		 104 if (count < 0 || count >= size)
105 return -EINVAL;
106 len += count;
107 size -= count;
108 }
109
29b71a1c
TR		 110 modalias[len] = '\0';
111 return len;
112}
113
114static ssize_t
115acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
116 struct acpi_device *acpi_dev = to_acpi_device(dev);
117 int len;
118
119 /* Device has no HID and no CID or string is >1024 */
120 len = create_modalias(acpi_dev, buf, 1024);
121 if (len <= 0)
122 return 0;
123 buf[len++] = '\n';
124 return len;
125}
126static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
127
683058e3
RW		 128static acpi_status acpi_bus_offline_companions(acpi_handle handle, u32 lvl,
129 void *data, void **ret_p)
130{
131 struct acpi_device *device = NULL;
132 struct acpi_device_physical_node *pn;
303bfdb1 133 bool second_pass = (bool)data;
683058e3
RW		 134 acpi_status status = AE_OK;
135
136 if (acpi_bus_get_device(handle, &device))
137 return AE_OK;
138
139 mutex_lock(&device->physical_node_lock);
140
141 list_for_each_entry(pn, &device->physical_node_list, node) {
142 int ret;
143
303bfdb1
RW		 144 if (second_pass) {
145 /* Skip devices offlined by the first pass. */
146 if (pn->put_online)
147 continue;
148 } else {
149 pn->put_online = false;
150 }
683058e3
RW		 151 ret = device_offline(pn->dev);
152 if (acpi_force_hot_remove)
153 continue;
154
303bfdb1
RW		 155 if (ret >= 0) {
156 pn->put_online = !ret;
157 } else {
158 *ret_p = pn->dev;
159 if (second_pass) {
160 status = AE_ERROR;
161 break;
162 }
683058e3 163 }
683058e3
RW		 164 }
165
166 mutex_unlock(&device->physical_node_lock);
167
168 return status;
169}
170
171static acpi_status acpi_bus_online_companions(acpi_handle handle, u32 lvl,
172 void *data, void **ret_p)
173{
174 struct acpi_device *device = NULL;
175 struct acpi_device_physical_node *pn;
176
177 if (acpi_bus_get_device(handle, &device))
178 return AE_OK;
179
180 mutex_lock(&device->physical_node_lock);
181
182 list_for_each_entry(pn, &device->physical_node_list, node)
183 if (pn->put_online) {
184 device_online(pn->dev);
185 pn->put_online = false;
186 }
187
188 mutex_unlock(&device->physical_node_lock);
189
190 return AE_OK;
191}
192
a33ec399 193static int acpi_scan_hot_remove(struct acpi_device *device)
1da177e4 194{
5993c467 195 acpi_handle handle = device->handle;
a33ec399 196 acpi_handle not_used;
1da177e4
LT		 197 struct acpi_object_list arg_list;
198 union acpi_object arg;
303bfdb1 199 struct device *errdev;
a33ec399 200 acpi_status status;
882fd12e 201 unsigned long long sta;
f058cdf4 202
3757b948 203 /* If there is no handle, the device node has been unregistered. */
a33ec399 204 if (!handle) {
3757b948
RW		 205 dev_dbg(&device->dev, "ACPI handle missing\n");
206 put_device(&device->dev);
a33ec399 207 return -EINVAL;
3757b948
RW		 208 }
209
683058e3
RW		 210 lock_device_hotplug();
211
303bfdb1
RW		 212 /*
213 * Carry out two passes here and ignore errors in the first pass,
214 * because if the devices in question are memory blocks and
215 * CONFIG_MEMCG is set, one of the blocks may hold data structures
216 * that the other blocks depend on, but it is not known in advance which
217 * block holds them.
218 *
219 * If the first pass is successful, the second one isn't needed, though.
220 */
221 errdev = NULL;
222 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
223 NULL, acpi_bus_offline_companions,
224 (void *)false, (void **)&errdev);
225 acpi_bus_offline_companions(handle, 0, (void *)false, (void **)&errdev);
226 if (errdev) {
227 errdev = NULL;
683058e3 228 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
303bfdb1
RW		 229 NULL, acpi_bus_offline_companions,
230 (void *)true , (void **)&errdev);
231 if (!errdev || acpi_force_hot_remove)
232 acpi_bus_offline_companions(handle, 0, (void *)true,
233 (void **)&errdev);
234
235 if (errdev && !acpi_force_hot_remove) {
236 dev_warn(errdev, "Offline failed.\n");
237 acpi_bus_online_companions(handle, 0, NULL, NULL);
238 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
239 ACPI_UINT32_MAX,
240 acpi_bus_online_companions, NULL,
241 NULL, NULL);
242
243 unlock_device_hotplug();
244
245 put_device(&device->dev);
246 return -EBUSY;
247 }
683058e3
RW		 248 }
249
26d46867 250 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
0794469d 251 "Hot-removing device %s...\n", dev_name(&device->dev)));
26d46867 252
bfee26db 253 acpi_bus_trim(device);
683058e3
RW		 254
255 unlock_device_hotplug();
256
3757b948
RW		 257 /* Device node has been unregistered. */
258 put_device(&device->dev);
b3c450c3
TK		 259 device = NULL;
260
a33ec399 261 if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &not_used))) {
1da177e4
LT		 262 arg_list.count = 1;
263 arg_list.pointer = &arg;
264 arg.type = ACPI_TYPE_INTEGER;
265 arg.integer.value = 0;
266 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
267 }
1da177e4 268
1da177e4
LT		 269 arg_list.count = 1;
270 arg_list.pointer = &arg;
271 arg.type = ACPI_TYPE_INTEGER;
272 arg.integer.value = 1;
1da177e4 273
1da177e4
LT		 274 /*
275 * TBD: _EJD support.
276 */
1da177e4 277 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
c4753e57 278 if (ACPI_FAILURE(status)) {
a33ec399
RW		 279 if (status == AE_NOT_FOUND) {
280 return -ENODEV;
281 } else {
882fd12e
TK		 282 acpi_handle_warn(handle, "Eject failed (0x%x)\n",
283 status);
a33ec399
RW		 284 return -EIO;
285 }
286 }
1da177e4 287
882fd12e
TK		 288 /*
289 * Verify if eject was indeed successful. If not, log an error
290 * message. No need to call _OST since _EJ0 call was made OK.
291 */
292 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
293 if (ACPI_FAILURE(status)) {
294 acpi_handle_warn(handle,
295 "Status check after eject failed (0x%x)\n", status);
296 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
297 acpi_handle_warn(handle,
298 "Eject incomplete - status 0x%llx\n", sta);
299 }
300
a33ec399
RW		 301 return 0;
302}
1da177e4 303
a33ec399
RW		 304static void acpi_bus_device_eject(void *context)
305{
306 acpi_handle handle = context;
307 struct acpi_device *device = NULL;
308 struct acpi_scan_handler *handler;
309 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
310
311 mutex_lock(&acpi_scan_lock);
312
313 acpi_bus_get_device(handle, &device);
314 if (!device)
315 goto err_out;
316
317 handler = device->handler;
318 if (!handler || !handler->hotplug.enabled) {
319 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
320 goto err_out;
321 }
322 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
323 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
324 if (handler->hotplug.mode == AHM_CONTAINER) {
325 device->flags.eject_pending = true;
326 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
327 } else {
328 int error;
329
330 get_device(&device->dev);
331 error = acpi_scan_hot_remove(device);
332 if (error)
333 goto err_out;
f058cdf4 334 }
1da177e4 335
3757b948 336 out:
f058cdf4 337 mutex_unlock(&acpi_scan_lock);
c8d72a5e 338 return;
a33ec399
RW		 339
340 err_out:
341 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code,
342 NULL);
343 goto out;
344}
345
346static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
347{
348 struct acpi_device *device = NULL;
349 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
350 int error;
351
352 mutex_lock(&acpi_scan_lock);
683058e3 353 lock_device_hotplug();
a33ec399 354
8832f7e4
RW		 355 if (ost_source != ACPI_NOTIFY_BUS_CHECK) {
356 acpi_bus_get_device(handle, &device);
357 if (device) {
358 dev_warn(&device->dev, "Attempt to re-insert\n");
359 goto out;
360 }
a33ec399
RW		 361 }
362 acpi_evaluate_hotplug_ost(handle, ost_source,
363 ACPI_OST_SC_INSERT_IN_PROGRESS, NULL);
364 error = acpi_bus_scan(handle);
365 if (error) {
366 acpi_handle_warn(handle, "Namespace scan failure\n");
367 goto out;
368 }
369 error = acpi_bus_get_device(handle, &device);
370 if (error) {
371 acpi_handle_warn(handle, "Missing device node object\n");
372 goto out;
373 }
374 ost_code = ACPI_OST_SC_SUCCESS;
375 if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
376 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
377
378 out:
683058e3 379 unlock_device_hotplug();
a33ec399
RW		 380 acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
381 mutex_unlock(&acpi_scan_lock);
382}
383
384static void acpi_scan_bus_check(void *context)
385{
386 acpi_scan_bus_device_check((acpi_handle)context,
387 ACPI_NOTIFY_BUS_CHECK);
388}
389
390static void acpi_scan_device_check(void *context)
391{
392 acpi_scan_bus_device_check((acpi_handle)context,
393 ACPI_NOTIFY_DEVICE_CHECK);
394}
395
2cbb14fb
TK		 396static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
397{
398 u32 ost_status;
399
400 switch (type) {
401 case ACPI_NOTIFY_BUS_CHECK:
402 acpi_handle_debug(handle,
403 "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
404 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
405 break;
406 case ACPI_NOTIFY_DEVICE_CHECK:
407 acpi_handle_debug(handle,
408 "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
409 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
410 break;
411 case ACPI_NOTIFY_EJECT_REQUEST:
412 acpi_handle_debug(handle,
413 "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
414 ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
415 break;
416 default:
417 /* non-hotplug event; possibly handled by other handler */
418 return;
419 }
420
421 acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
422}
423
424static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
a33ec399
RW		 425{
426 acpi_osd_exec_callback callback;
2cbb14fb 427 struct acpi_scan_handler *handler = data;
a33ec399
RW		 428 acpi_status status;
429
2cbb14fb
TK		 430 if (!handler->hotplug.enabled)
431 return acpi_hotplug_unsupported(handle, type);
432
a33ec399
RW		 433 switch (type) {
434 case ACPI_NOTIFY_BUS_CHECK:
435 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
436 callback = acpi_scan_bus_check;
437 break;
438 case ACPI_NOTIFY_DEVICE_CHECK:
439 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
440 callback = acpi_scan_device_check;
441 break;
442 case ACPI_NOTIFY_EJECT_REQUEST:
443 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
444 callback = acpi_bus_device_eject;
445 break;
446 default:
447 /* non-hotplug event; possibly handled by other handler */
448 return;
449 }
450 status = acpi_os_hotplug_execute(callback, handle);
451 if (ACPI_FAILURE(status))
452 acpi_evaluate_hotplug_ost(handle, type,
453 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
454 NULL);
455}
456
457/**
458 * acpi_bus_hot_remove_device: hot-remove a device and its children
459 * @context: struct acpi_eject_event pointer (freed in this func)
460 *
461 * Hot-remove a device and its children. This function frees up the
462 * memory space passed by arg context, so that the caller may call
463 * this function asynchronously through acpi_os_hotplug_execute().
464 */
465void acpi_bus_hot_remove_device(void *context)
466{
467 struct acpi_eject_event *ej_event = context;
468 struct acpi_device *device = ej_event->device;
469 acpi_handle handle = device->handle;
470 int error;
471
472 mutex_lock(&acpi_scan_lock);
473
474 error = acpi_scan_hot_remove(device);
475 if (error && handle)
476 acpi_evaluate_hotplug_ost(handle, ej_event->event,
477 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
478 NULL);
479
480 mutex_unlock(&acpi_scan_lock);
481 kfree(context);
1da177e4 482}
61622acc 483EXPORT_SYMBOL(acpi_bus_hot_remove_device);
1da177e4 484
836aedb1
RW		 485static ssize_t real_power_state_show(struct device *dev,
486 struct device_attribute *attr, char *buf)
487{
488 struct acpi_device *adev = to_acpi_device(dev);
489 int state;
490 int ret;
491
492 ret = acpi_device_get_power(adev, &state);
493 if (ret)
494 return ret;
495
496 return sprintf(buf, "%s\n", acpi_power_state_string(state));
497}
498
499static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
500
501static ssize_t power_state_show(struct device *dev,
502 struct device_attribute *attr, char *buf)
503{
504 struct acpi_device *adev = to_acpi_device(dev);
505
506 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
507}
508
509static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
510
1da177e4 511static ssize_t
f883d9db
PM		 512acpi_eject_store(struct device *d, struct device_attribute *attr,
513 const char *buf, size_t count)
1da177e4 514{
f883d9db 515 struct acpi_device *acpi_device = to_acpi_device(d);
c4753e57 516 struct acpi_eject_event *ej_event;
a33ec399
RW		 517 acpi_object_type not_used;
518 acpi_status status;
519 u32 ost_source;
520 int ret;
1da177e4 521
a33ec399 522 if (!count || buf[0] != '1')
1da177e4 523 return -EINVAL;
1da177e4 524
a33ec399
RW		 525 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
526 && !acpi_device->driver)
527 return -ENODEV;
528
529 status = acpi_get_type(acpi_device->handle, &not_used);
530 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
531 return -ENODEV;
532
533 mutex_lock(&acpi_scan_lock);
c4753e57 534
c4753e57 535 if (acpi_device->flags.eject_pending) {
a33ec399
RW		 536 /* ACPI eject notification event. */
537 ost_source = ACPI_NOTIFY_EJECT_REQUEST;
c4753e57
TK		 538 acpi_device->flags.eject_pending = 0;
539 } else {
a33ec399
RW		 540 /* Eject initiated by user space. */
541 ost_source = ACPI_OST_EC_OSPM_EJECT;
c4753e57 542 }
a33ec399
RW		 543 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
544 if (!ej_event) {
545 ret = -ENOMEM;
546 goto err_out;
547 }
548 acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
549 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
550 ej_event->device = acpi_device;
551 ej_event->event = ost_source;
552 get_device(&acpi_device->dev);
3757b948
RW		 553 status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
554 if (ACPI_FAILURE(status)) {
555 put_device(&acpi_device->dev);
556 kfree(ej_event);
a33ec399
RW		 557 ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
558 goto err_out;
3757b948 559 }
a33ec399
RW		 560 ret = count;
561
562 out:
563 mutex_unlock(&acpi_scan_lock);
1da177e4 564 return ret;
a33ec399
RW		 565
566 err_out:
567 acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
568 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
569 goto out;
1da177e4
LT		 570}
571
f883d9db 572static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
1da177e4 573
e49bd2dd
ZR		 574static ssize_t
575acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
576 struct acpi_device *acpi_dev = to_acpi_device(dev);
1da177e4 577
ea8d82fd 578 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
1da177e4 579}
e49bd2dd 580static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
1da177e4 581
923d4a45
LZ		 582static ssize_t acpi_device_uid_show(struct device *dev,
583 struct device_attribute *attr, char *buf)
584{
585 struct acpi_device *acpi_dev = to_acpi_device(dev);
586
587 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
588}
589static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
590
591static ssize_t acpi_device_adr_show(struct device *dev,
592 struct device_attribute *attr, char *buf)
593{
594 struct acpi_device *acpi_dev = to_acpi_device(dev);
595
596 return sprintf(buf, "0x%08x\n",
597 (unsigned int)(acpi_dev->pnp.bus_address));
598}
599static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
600
e49bd2dd
ZR		 601static ssize_t
602acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
603 struct acpi_device *acpi_dev = to_acpi_device(dev);
604 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
605 int result;
1da177e4 606
e49bd2dd 607 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
0c526d96 608 if (result)
e49bd2dd 609 goto end;
1da177e4 610
e49bd2dd
ZR		 611 result = sprintf(buf, "%s\n", (char*)path.pointer);
612 kfree(path.pointer);
0c526d96 613end:
e49bd2dd 614 return result;
1da177e4 615}
e49bd2dd 616static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
1da177e4 617
d1efe3c3
LO		 618/* sysfs file that shows description text from the ACPI _STR method */
619static ssize_t description_show(struct device *dev,
620 struct device_attribute *attr,
621 char *buf) {
622 struct acpi_device *acpi_dev = to_acpi_device(dev);
623 int result;
624
625 if (acpi_dev->pnp.str_obj == NULL)
626 return 0;
627
628 /*
629 * The _STR object contains a Unicode identifier for a device.
630 * We need to convert to utf-8 so it can be displayed.
631 */
632 result = utf16s_to_utf8s(
633 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
634 acpi_dev->pnp.str_obj->buffer.length,
635 UTF16_LITTLE_ENDIAN, buf,
636 PAGE_SIZE);
637
638 buf[result++] = '\n';
639
640 return result;
641}
642static DEVICE_ATTR(description, 0444, description_show, NULL);
643
bb74ac23
YI		 644static ssize_t
645acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
646 char *buf) {
647 struct acpi_device *acpi_dev = to_acpi_device(dev);
648
649 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
650}
651static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
652
e49bd2dd 653static int acpi_device_setup_files(struct acpi_device *dev)
1da177e4 654{
d1efe3c3 655 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
f883d9db
PM		 656 acpi_status status;
657 acpi_handle temp;
bb74ac23 658 unsigned long long sun;
e49bd2dd 659 int result = 0;
1da177e4
LT		 660
661 /*
e49bd2dd 662 * Devices gotten from FADT don't have a "path" attribute
1da177e4 663 */
0c526d96 664 if (dev->handle) {
e49bd2dd 665 result = device_create_file(&dev->dev, &dev_attr_path);
0c526d96 666 if (result)
e49bd2dd 667 goto end;
1da177e4
LT		 668 }
669
2b2ae7c7
TR		 670 if (!list_empty(&dev->pnp.ids)) {
671 result = device_create_file(&dev->dev, &dev_attr_hid);
672 if (result)
673 goto end;
1da177e4 674
2b2ae7c7
TR		 675 result = device_create_file(&dev->dev, &dev_attr_modalias);
676 if (result)
677 goto end;
678 }
29b71a1c 679
d1efe3c3
LO		 680 /*
681 * If device has _STR, 'description' file is created
682 */
683 status = acpi_get_handle(dev->handle, "_STR", &temp);
684 if (ACPI_SUCCESS(status)) {
685 status = acpi_evaluate_object(dev->handle, "_STR",
686 NULL, &buffer);
687 if (ACPI_FAILURE(status))
688 buffer.pointer = NULL;
689 dev->pnp.str_obj = buffer.pointer;
690 result = device_create_file(&dev->dev, &dev_attr_description);
691 if (result)
692 goto end;
693 }
694
d4e1a692 695 if (dev->pnp.type.bus_address)
923d4a45
LZ		 696 result = device_create_file(&dev->dev, &dev_attr_adr);
697 if (dev->pnp.unique_id)
698 result = device_create_file(&dev->dev, &dev_attr_uid);
699
bb74ac23
YI		 700 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
701 if (ACPI_SUCCESS(status)) {
702 dev->pnp.sun = (unsigned long)sun;
703 result = device_create_file(&dev->dev, &dev_attr_sun);
704 if (result)
705 goto end;
706 } else {
707 dev->pnp.sun = (unsigned long)-1;
708 }
709
e49bd2dd
ZR		 710 /*
711 * If device has _EJ0, 'eject' file is created that is used to trigger
712 * hot-removal function from userland.
713 */
f883d9db 714 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
836aedb1 715 if (ACPI_SUCCESS(status)) {
e49bd2dd 716 result = device_create_file(&dev->dev, &dev_attr_eject);
836aedb1
RW		 717 if (result)
718 return result;
719 }
720
721 if (dev->flags.power_manageable) {
722 result = device_create_file(&dev->dev, &dev_attr_power_state);
723 if (result)
724 return result;
725
726 if (dev->power.flags.power_resources)
727 result = device_create_file(&dev->dev,
728 &dev_attr_real_power_state);
729 }
730
0c526d96 731end:
e49bd2dd 732 return result;
1da177e4
LT		 733}
734
f883d9db 735static void acpi_device_remove_files(struct acpi_device *dev)
1da177e4 736{
f883d9db
PM		 737 acpi_status status;
738 acpi_handle temp;
1da177e4 739
836aedb1
RW		 740 if (dev->flags.power_manageable) {
741 device_remove_file(&dev->dev, &dev_attr_power_state);
742 if (dev->power.flags.power_resources)
743 device_remove_file(&dev->dev,
744 &dev_attr_real_power_state);
745 }
746
f883d9db 747 /*
d1efe3c3
LO		 748 * If device has _STR, remove 'description' file
749 */
750 status = acpi_get_handle(dev->handle, "_STR", &temp);
751 if (ACPI_SUCCESS(status)) {
752 kfree(dev->pnp.str_obj);
753 device_remove_file(&dev->dev, &dev_attr_description);
754 }
755 /*
756 * If device has _EJ0, remove 'eject' file.
f883d9db
PM		 757 */
758 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
759 if (ACPI_SUCCESS(status))
760 device_remove_file(&dev->dev, &dev_attr_eject);
1da177e4 761
bb74ac23
YI		 762 status = acpi_get_handle(dev->handle, "_SUN", &temp);
763 if (ACPI_SUCCESS(status))
764 device_remove_file(&dev->dev, &dev_attr_sun);
765
923d4a45
LZ		 766 if (dev->pnp.unique_id)
767 device_remove_file(&dev->dev, &dev_attr_uid);
d4e1a692 768 if (dev->pnp.type.bus_address)
923d4a45 769 device_remove_file(&dev->dev, &dev_attr_adr);
1131b938
BH		 770 device_remove_file(&dev->dev, &dev_attr_modalias);
771 device_remove_file(&dev->dev, &dev_attr_hid);
0c526d96 772 if (dev->handle)
e49bd2dd 773 device_remove_file(&dev->dev, &dev_attr_path);
1da177e4 774}
1da177e4 775/* --------------------------------------------------------------------------
9e89dde2 776 ACPI Bus operations
1da177e4 777 -------------------------------------------------------------------------- */
29b71a1c 778
cf761af9
MW		 779static const struct acpi_device_id *__acpi_match_device(
780 struct acpi_device *device, const struct acpi_device_id *ids)
29b71a1c
TR		 781{
782 const struct acpi_device_id *id;
7f47fa6c 783 struct acpi_hardware_id *hwid;
29b71a1c 784
39a0ad87
ZY		 785 /*
786 * If the device is not present, it is unnecessary to load device
787 * driver for it.
788 */
789 if (!device->status.present)
cf761af9 790 return NULL;
39a0ad87 791
7f47fa6c
BH		 792 for (id = ids; id->id[0]; id++)
793 list_for_each_entry(hwid, &device->pnp.ids, list)
794 if (!strcmp((char *) id->id, hwid->id))
cf761af9
MW		 795 return id;
796
797 return NULL;
798}
799
800/**
801 * acpi_match_device - Match a struct device against a given list of ACPI IDs
802 * @ids: Array of struct acpi_device_id object to match against.
803 * @dev: The device structure to match.
804 *
805 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
806 * object for that handle and use that object to match against a given list of
807 * device IDs.
808 *
809 * Return a pointer to the first matching ID on success or %NULL on failure.
810 */
811const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
812 const struct device *dev)
813{
814 struct acpi_device *adev;
0613e1f7 815 acpi_handle handle = ACPI_HANDLE(dev);
cf761af9 816
0613e1f7 817 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
cf761af9
MW		 818 return NULL;
819
820 return __acpi_match_device(adev, ids);
821}
822EXPORT_SYMBOL_GPL(acpi_match_device);
29b71a1c 823
cf761af9
MW		 824int acpi_match_device_ids(struct acpi_device *device,
825 const struct acpi_device_id *ids)
826{
827 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
29b71a1c
TR		 828}
829EXPORT_SYMBOL(acpi_match_device_ids);
830
0b224527
RW		 831static void acpi_free_power_resources_lists(struct acpi_device *device)
832{
833 int i;
834
993cbe59
RW		 835 if (device->wakeup.flags.valid)
836 acpi_power_resources_list_free(&device->wakeup.resources);
837
0b224527
RW		 838 if (!device->flags.power_manageable)
839 return;
840
841 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
842 struct acpi_device_power_state *ps = &device->power.states[i];
843 acpi_power_resources_list_free(&ps->resources);
844 }
7f47fa6c
BH		 845}
846
1890a97a 847static void acpi_device_release(struct device *dev)
1da177e4 848{
1890a97a 849 struct acpi_device *acpi_dev = to_acpi_device(dev);
1da177e4 850
c0af4175 851 acpi_free_pnp_ids(&acpi_dev->pnp);
0b224527 852 acpi_free_power_resources_lists(acpi_dev);
1890a97a 853 kfree(acpi_dev);
1da177e4
LT		 854}
855
5d9464a4 856static int acpi_bus_match(struct device *dev, struct device_driver *drv)
9e89dde2 857{
5d9464a4
PM		 858 struct acpi_device *acpi_dev = to_acpi_device(dev);
859 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
1da177e4 860
209d3b17 861 return acpi_dev->flags.match_driver
805d410f 862 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
5d9464a4 863}
1da177e4 864
7eff2e7a 865static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
1da177e4 866{
5d9464a4 867 struct acpi_device *acpi_dev = to_acpi_device(dev);
7eff2e7a 868 int len;
5d9464a4 869
2b2ae7c7
TR		 870 if (list_empty(&acpi_dev->pnp.ids))
871 return 0;
872
7eff2e7a
KS		 873 if (add_uevent_var(env, "MODALIAS="))
874 return -ENOMEM;
875 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
876 sizeof(env->buf) - env->buflen);
877 if (len >= (sizeof(env->buf) - env->buflen))
878 return -ENOMEM;
879 env->buflen += len;
9e89dde2 880 return 0;
1da177e4
LT		 881}
882
46ec8598
BH		 883static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
884{
885 struct acpi_device *device = data;
886
887 device->driver->ops.notify(device, event);
888}
889
890static acpi_status acpi_device_notify_fixed(void *data)
891{
892 struct acpi_device *device = data;
893
53de5356
BH		 894 /* Fixed hardware devices have no handles */
895 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
46ec8598
BH		 896 return AE_OK;
897}
898
899static int acpi_device_install_notify_handler(struct acpi_device *device)
900{
901 acpi_status status;
46ec8598 902
ccba2a36 903 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
46ec8598
BH		 904 status =
905 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
906 acpi_device_notify_fixed,
907 device);
ccba2a36 908 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
46ec8598
BH		 909 status =
910 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
911 acpi_device_notify_fixed,
912 device);
913 else
914 status = acpi_install_notify_handler(device->handle,
915 ACPI_DEVICE_NOTIFY,
916 acpi_device_notify,
917 device);
918
919 if (ACPI_FAILURE(status))
920 return -EINVAL;
921 return 0;
922}
923
924static void acpi_device_remove_notify_handler(struct acpi_device *device)
925{
ccba2a36 926 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
46ec8598
BH		 927 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
928 acpi_device_notify_fixed);
ccba2a36 929 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
46ec8598
BH		 930 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
931 acpi_device_notify_fixed);
932 else
933 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
934 acpi_device_notify);
935}
936
d9e455f5 937static int acpi_device_probe(struct device *dev)
1da177e4 938{
5d9464a4
PM		 939 struct acpi_device *acpi_dev = to_acpi_device(dev);
940 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
941 int ret;
942
24071f47
RW		 943 if (acpi_dev->handler)
944 return -EINVAL;
945
d9e455f5
RW		 946 if (!acpi_drv->ops.add)
947 return -ENOSYS;
46ec8598 948
d9e455f5
RW		 949 ret = acpi_drv->ops.add(acpi_dev);
950 if (ret)
951 return ret;
46ec8598 952
d9e455f5
RW		 953 acpi_dev->driver = acpi_drv;
954 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
955 "Driver [%s] successfully bound to device [%s]\n",
956 acpi_drv->name, acpi_dev->pnp.bus_id));
957
958 if (acpi_drv->ops.notify) {
959 ret = acpi_device_install_notify_handler(acpi_dev);
960 if (ret) {
961 if (acpi_drv->ops.remove)
962 acpi_drv->ops.remove(acpi_dev);
963
964 acpi_dev->driver = NULL;
965 acpi_dev->driver_data = NULL;
966 return ret;
967 }
5d9464a4 968 }
d9e455f5
RW		 969
970 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
971 acpi_drv->name, acpi_dev->pnp.bus_id));
972 get_device(dev);
973 return 0;
5d9464a4 974}
1da177e4 975
5d9464a4
PM		 976static int acpi_device_remove(struct device * dev)
977{
978 struct acpi_device *acpi_dev = to_acpi_device(dev);
979 struct acpi_driver *acpi_drv = acpi_dev->driver;
980
981 if (acpi_drv) {
46ec8598
BH		 982 if (acpi_drv->ops.notify)
983 acpi_device_remove_notify_handler(acpi_dev);
5d9464a4 984 if (acpi_drv->ops.remove)
51fac838 985 acpi_drv->ops.remove(acpi_dev);
1da177e4 986 }
5d9464a4 987 acpi_dev->driver = NULL;
db89b4f0 988 acpi_dev->driver_data = NULL;
1da177e4 989
5d9464a4 990 put_device(dev);
9e89dde2
ZR		 991 return 0;
992}
1da177e4 993
55955aad 994struct bus_type acpi_bus_type = {
9e89dde2 995 .name = "acpi",
5d9464a4
PM		 996 .match = acpi_bus_match,
997 .probe = acpi_device_probe,
998 .remove = acpi_device_remove,
999 .uevent = acpi_device_uevent,
9e89dde2
ZR		 1000};
1001
cf860be6
RW		 1002int acpi_device_add(struct acpi_device *device,
1003 void (*release)(struct device *))
1da177e4 1004{
4be44fcd 1005 int result;
e49bd2dd
ZR		 1006 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1007 int found = 0;
66b7ed40 1008
d43e167d
RW		 1009 if (device->handle) {
1010 acpi_status status;
1011
1012 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
1013 device);
1014 if (ACPI_FAILURE(status)) {
1015 acpi_handle_err(device->handle,
1016 "Unable to attach device data\n");
1017 return -ENODEV;
1018 }
1019 }
1020
9e89dde2
ZR		 1021 /*
1022 * Linkage
1023 * -------
1024 * Link this device to its parent and siblings.
1025 */
1026 INIT_LIST_HEAD(&device->children);
1027 INIT_LIST_HEAD(&device->node);
9e89dde2 1028 INIT_LIST_HEAD(&device->wakeup_list);
1033f904
LT		 1029 INIT_LIST_HEAD(&device->physical_node_list);
1030 mutex_init(&device->physical_node_lock);
bc9b6407 1031 INIT_LIST_HEAD(&device->power_dependent);
1da177e4 1032
e49bd2dd
ZR		 1033 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1034 if (!new_bus_id) {
d43e167d
RW		 1035 pr_err(PREFIX "Memory allocation error\n");
1036 result = -ENOMEM;
1037 goto err_detach;
1da177e4 1038 }
e49bd2dd 1039
9090589d 1040 mutex_lock(&acpi_device_lock);
e49bd2dd
ZR		 1041 /*
1042 * Find suitable bus_id and instance number in acpi_bus_id_list
1043 * If failed, create one and link it into acpi_bus_id_list
1044 */
1045 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1131b938
BH		 1046 if (!strcmp(acpi_device_bus_id->bus_id,
1047 acpi_device_hid(device))) {
1048 acpi_device_bus_id->instance_no++;
e49bd2dd
ZR		 1049 found = 1;
1050 kfree(new_bus_id);
1051 break;
1052 }
1da177e4 1053 }
0c526d96 1054 if (!found) {
e49bd2dd 1055 acpi_device_bus_id = new_bus_id;
1131b938 1056 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
e49bd2dd
ZR		 1057 acpi_device_bus_id->instance_no = 0;
1058 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1da177e4 1059 }
0794469d 1060 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
1da177e4 1061
33b57150 1062 if (device->parent)
9e89dde2 1063 list_add_tail(&device->node, &device->parent->children);
33b57150 1064
9e89dde2
ZR		 1065 if (device->wakeup.flags.valid)
1066 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
9090589d 1067 mutex_unlock(&acpi_device_lock);
1da177e4 1068
1890a97a 1069 if (device->parent)
66b7ed40 1070 device->dev.parent = &device->parent->dev;
1890a97a 1071 device->dev.bus = &acpi_bus_type;
82c7d5ef 1072 device->dev.release = release;
cf860be6 1073 result = device_add(&device->dev);
0c526d96 1074 if (result) {
8b12b922 1075 dev_err(&device->dev, "Error registering device\n");
d43e167d 1076 goto err;
1da177e4 1077 }
1da177e4 1078
e49bd2dd 1079 result = acpi_device_setup_files(device);
0c526d96 1080 if (result)
0794469d
KS		 1081 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1082 dev_name(&device->dev));
1da177e4 1083
1da177e4 1084 return 0;
d43e167d
RW		 1085
1086 err:
9090589d 1087 mutex_lock(&acpi_device_lock);
33b57150 1088 if (device->parent)
e49bd2dd 1089 list_del(&device->node);
e49bd2dd 1090 list_del(&device->wakeup_list);
9090589d 1091 mutex_unlock(&acpi_device_lock);
d43e167d
RW		 1092
1093 err_detach:
1094 acpi_detach_data(device->handle, acpi_bus_data_handler);
e49bd2dd 1095 return result;
1da177e4
LT		 1096}
1097
b17b537a 1098static void acpi_device_unregister(struct acpi_device *device)
9e89dde2 1099{
9090589d 1100 mutex_lock(&acpi_device_lock);
33b57150 1101 if (device->parent)
9e89dde2 1102 list_del(&device->node);
1da177e4 1103
9e89dde2 1104 list_del(&device->wakeup_list);
9090589d 1105 mutex_unlock(&acpi_device_lock);
1da177e4 1106
9e89dde2 1107 acpi_detach_data(device->handle, acpi_bus_data_handler);
1890a97a 1108
bc9b6407 1109 acpi_power_add_remove_device(device, false);
f883d9db 1110 acpi_device_remove_files(device);
b1c0f99b
RW		 1111 if (device->remove)
1112 device->remove(device);
1113
cf860be6 1114 device_del(&device->dev);
bc9b6407 1115 /*
0aa120a0
RW		 1116 * Transition the device to D3cold to drop the reference counts of all
1117 * power resources the device depends on and turn off the ones that have
1118 * no more references.
bc9b6407 1119 */
0aa120a0 1120 acpi_device_set_power(device, ACPI_STATE_D3_COLD);
3757b948 1121 device->handle = NULL;
cf860be6 1122 put_device(&device->dev);
1da177e4
LT		 1123}
1124
9e89dde2
ZR		 1125/* --------------------------------------------------------------------------
1126 Driver Management
1127 -------------------------------------------------------------------------- */
9e89dde2
ZR		 1128/**
1129 * acpi_bus_register_driver - register a driver with the ACPI bus
1130 * @driver: driver being registered
1131 *
1132 * Registers a driver with the ACPI bus. Searches the namespace for all
1133 * devices that match the driver's criteria and binds. Returns zero for
1134 * success or a negative error status for failure.
1135 */
1136int acpi_bus_register_driver(struct acpi_driver *driver)
1da177e4 1137{
1890a97a 1138 int ret;
1da177e4 1139
9e89dde2
ZR		 1140 if (acpi_disabled)
1141 return -ENODEV;
1890a97a
PM		 1142 driver->drv.name = driver->name;
1143 driver->drv.bus = &acpi_bus_type;
1144 driver->drv.owner = driver->owner;
1da177e4 1145
1890a97a
PM		 1146 ret = driver_register(&driver->drv);
1147 return ret;
9e89dde2 1148}
1da177e4 1149
9e89dde2
ZR		 1150EXPORT_SYMBOL(acpi_bus_register_driver);
1151
1152/**
1153 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1154 * @driver: driver to unregister
1155 *
1156 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1157 * devices that match the driver's criteria and unbinds.
1158 */
1159void acpi_bus_unregister_driver(struct acpi_driver *driver)
1160{
1890a97a 1161 driver_unregister(&driver->drv);
9e89dde2
ZR		 1162}
1163
1164EXPORT_SYMBOL(acpi_bus_unregister_driver);
1165
9e89dde2
ZR		 1166/* --------------------------------------------------------------------------
1167 Device Enumeration
1168 -------------------------------------------------------------------------- */
5c478f49
BH		 1169static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1170{
456de893 1171 struct acpi_device *device = NULL;
5c478f49 1172 acpi_status status;
5c478f49
BH		 1173
1174 /*
1175 * Fixed hardware devices do not appear in the namespace and do not
1176 * have handles, but we fabricate acpi_devices for them, so we have
1177 * to deal with them specially.
1178 */
456de893 1179 if (!handle)
5c478f49
BH		 1180 return acpi_root;
1181
1182 do {
1183 status = acpi_get_parent(handle, &handle);
5c478f49 1184 if (ACPI_FAILURE(status))
456de893
RW		 1185 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1186 } while (acpi_bus_get_device(handle, &device));
1187 return device;
5c478f49
BH		 1188}
1189
9e89dde2
ZR		 1190acpi_status
1191acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1192{
1193 acpi_status status;
1194 acpi_handle tmp;
1195 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1196 union acpi_object *obj;
1197
1198 status = acpi_get_handle(handle, "_EJD", &tmp);
1199 if (ACPI_FAILURE(status))
1200 return status;
1201
1202 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1203 if (ACPI_SUCCESS(status)) {
1204 obj = buffer.pointer;
3b5fee59
HM		 1205 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1206 ejd);
9e89dde2
ZR		 1207 kfree(buffer.pointer);
1208 }
1209 return status;
1210}
1211EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1212
8e4319c4 1213void acpi_bus_data_handler(acpi_handle handle, void *context)
9e89dde2
ZR		 1214{
1215
1216 /* TBD */
1217
1218 return;
1219}
1220
e88c9c60
RW		 1221static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1222 struct acpi_device_wakeup *wakeup)
9e89dde2 1223{
b581a7f9
RW		 1224 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1225 union acpi_object *package = NULL;
9e89dde2 1226 union acpi_object *element = NULL;
b581a7f9 1227 acpi_status status;
e88c9c60 1228 int err = -ENODATA;
9e89dde2 1229
b581a7f9 1230 if (!wakeup)
e88c9c60 1231 return -EINVAL;
9e89dde2 1232
993cbe59 1233 INIT_LIST_HEAD(&wakeup->resources);
9e89dde2 1234
b581a7f9
RW		 1235 /* _PRW */
1236 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1237 if (ACPI_FAILURE(status)) {
1238 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
e88c9c60 1239 return err;
b581a7f9
RW		 1240 }
1241
1242 package = (union acpi_object *)buffer.pointer;
1243
e88c9c60 1244 if (!package || package->package.count < 2)
b581a7f9 1245 goto out;
b581a7f9 1246
9e89dde2 1247 element = &(package->package.elements[0]);
e88c9c60 1248 if (!element)
b581a7f9 1249 goto out;
e88c9c60 1250
9e89dde2
ZR		 1251 if (element->type == ACPI_TYPE_PACKAGE) {
1252 if ((element->package.count < 2) ||
1253 (element->package.elements[0].type !=
1254 ACPI_TYPE_LOCAL_REFERENCE)
e88c9c60 1255 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
b581a7f9 1256 goto out;
e88c9c60 1257
b581a7f9 1258 wakeup->gpe_device =
9e89dde2 1259 element->package.elements[0].reference.handle;
b581a7f9 1260 wakeup->gpe_number =
9e89dde2
ZR		 1261 (u32) element->package.elements[1].integer.value;
1262 } else if (element->type == ACPI_TYPE_INTEGER) {
b581a7f9
RW		 1263 wakeup->gpe_device = NULL;
1264 wakeup->gpe_number = element->integer.value;
1265 } else {
b581a7f9
RW		 1266 goto out;
1267 }
9e89dde2
ZR		 1268
1269 element = &(package->package.elements[1]);
e88c9c60 1270 if (element->type != ACPI_TYPE_INTEGER)
b581a7f9 1271 goto out;
e88c9c60 1272
b581a7f9 1273 wakeup->sleep_state = element->integer.value;
9e89dde2 1274
e88c9c60
RW		 1275 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1276 if (err)
b581a7f9 1277 goto out;
9e89dde2 1278
0596a52b
RW		 1279 if (!list_empty(&wakeup->resources)) {
1280 int sleep_state;
9e89dde2 1281
b5d667eb
RW		 1282 err = acpi_power_wakeup_list_init(&wakeup->resources,
1283 &sleep_state);
1284 if (err) {
1285 acpi_handle_warn(handle, "Retrieving current states "
1286 "of wakeup power resources failed\n");
1287 acpi_power_resources_list_free(&wakeup->resources);
1288 goto out;
1289 }
0596a52b
RW		 1290 if (sleep_state < wakeup->sleep_state) {
1291 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1292 "(S%d) by S%d from power resources\n",
1293 (int)wakeup->sleep_state, sleep_state);
1294 wakeup->sleep_state = sleep_state;
1295 }
1296 }
bba63a29 1297 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
9874647b 1298
b581a7f9
RW		 1299 out:
1300 kfree(buffer.pointer);
e88c9c60 1301 return err;
1da177e4
LT		 1302}
1303
f517709d 1304static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1da177e4 1305{
29b71a1c 1306 struct acpi_device_id button_device_ids[] = {
29b71a1c 1307 {"PNP0C0C", 0},
b7e38304 1308 {"PNP0C0D", 0},
29b71a1c
TR		 1309 {"PNP0C0E", 0},
1310 {"", 0},
1311 };
f517709d
RW		 1312 acpi_status status;
1313 acpi_event_status event_status;
1314
b67ea761 1315 device->wakeup.flags.notifier_present = 0;
f517709d
RW		 1316
1317 /* Power button, Lid switch always enable wakeup */
1318 if (!acpi_match_device_ids(device, button_device_ids)) {
1319 device->wakeup.flags.run_wake = 1;
b7e38304
ZR		 1320 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1321 /* Do not use Lid/sleep button for S5 wakeup */
1322 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1323 device->wakeup.sleep_state = ACPI_STATE_S4;
1324 }
f2b56bc8 1325 device_set_wakeup_capable(&device->dev, true);
f517709d
RW		 1326 return;
1327 }
1328
e8e18c95
RW		 1329 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1330 device->wakeup.gpe_number,
1331 &event_status);
f517709d
RW		 1332 if (status == AE_OK)
1333 device->wakeup.flags.run_wake =
1334 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1335}
1336
d57d09a4 1337static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
f517709d 1338{
d57d09a4 1339 acpi_handle temp;
f517709d 1340 acpi_status status = 0;
e88c9c60 1341 int err;
29b71a1c 1342
d57d09a4
RW		 1343 /* Presence of _PRW indicates wake capable */
1344 status = acpi_get_handle(device->handle, "_PRW", &temp);
1345 if (ACPI_FAILURE(status))
1346 return;
1347
e88c9c60
RW		 1348 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1349 &device->wakeup);
1350 if (err) {
1351 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
d57d09a4 1352 return;
9e89dde2 1353 }
1da177e4 1354
9e89dde2 1355 device->wakeup.flags.valid = 1;
9b83ccd2 1356 device->wakeup.prepare_count = 0;
f517709d 1357 acpi_bus_set_run_wake_flags(device);
729b2bdb
ZY		 1358 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1359 * system for the ACPI device with the _PRW object.
1360 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1361 * So it is necessary to call _DSW object first. Only when it is not
1362 * present will the _PSW object used.
1363 */
e88c9c60
RW		 1364 err = acpi_device_sleep_wake(device, 0, 0, 0);
1365 if (err)
77e76609
RW		 1366 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1367 "error in _DSW or _PSW evaluation\n"));
1da177e4 1368}
1da177e4 1369
f33ce568
RW		 1370static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1371{
1372 struct acpi_device_power_state *ps = &device->power.states[state];
ef85bdbe
RW		 1373 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1374 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
f33ce568
RW		 1375 acpi_handle handle;
1376 acpi_status status;
bf325f95 1377
f33ce568
RW		 1378 INIT_LIST_HEAD(&ps->resources);
1379
ef85bdbe
RW		 1380 /* Evaluate "_PRx" to get referenced power resources */
1381 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1382 if (ACPI_SUCCESS(status)) {
1383 union acpi_object *package = buffer.pointer;
1384
1385 if (buffer.length && package
1386 && package->type == ACPI_TYPE_PACKAGE
1387 && package->package.count) {
e88c9c60
RW		 1388 int err = acpi_extract_power_resources(package, 0,
1389 &ps->resources);
1390 if (!err)
ef85bdbe 1391 device->power.flags.power_resources = 1;
f33ce568 1392 }
ef85bdbe 1393 ACPI_FREE(buffer.pointer);
f33ce568
RW		 1394 }
1395
1396 /* Evaluate "_PSx" to see if we can do explicit sets */
ef85bdbe
RW		 1397 pathname[2] = 'S';
1398 status = acpi_get_handle(device->handle, pathname, &handle);
f33ce568
RW		 1399 if (ACPI_SUCCESS(status))
1400 ps->flags.explicit_set = 1;
1401
1402 /*
1403 * State is valid if there are means to put the device into it.
1404 * D3hot is only valid if _PR3 present.
1405 */
ef85bdbe 1406 if (!list_empty(&ps->resources)
f33ce568
RW		 1407 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1408 ps->flags.valid = 1;
1409 ps->flags.os_accessible = 1;
1410 }
1411
1412 ps->power = -1; /* Unknown - driver assigned */
1413 ps->latency = -1; /* Unknown - driver assigned */
1414}
1415
d43e167d 1416static void acpi_bus_get_power_flags(struct acpi_device *device)
1da177e4 1417{
8bc5053b
RW		 1418 acpi_status status;
1419 acpi_handle handle;
1420 u32 i;
1a365616 1421
d43e167d
RW		 1422 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1423 status = acpi_get_handle(device->handle, "_PS0", &handle);
1424 if (ACPI_FAILURE(status)) {
1425 status = acpi_get_handle(device->handle, "_PR0", &handle);
1426 if (ACPI_FAILURE(status))
1427 return;
1428 }
1a365616 1429
d43e167d 1430 device->flags.power_manageable = 1;
4be44fcd 1431
9e89dde2
ZR		 1432 /*
1433 * Power Management Flags
1434 */
1435 status = acpi_get_handle(device->handle, "_PSC", &handle);
1436 if (ACPI_SUCCESS(status))
1437 device->power.flags.explicit_get = 1;
1438 status = acpi_get_handle(device->handle, "_IRC", &handle);
1439 if (ACPI_SUCCESS(status))
1440 device->power.flags.inrush_current = 1;
1da177e4 1441
9e89dde2
ZR		 1442 /*
1443 * Enumerate supported power management states
1444 */
f33ce568
RW		 1445 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1446 acpi_bus_init_power_state(device, i);
bf325f95 1447
0b224527 1448 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1da177e4 1449
9e89dde2
ZR		 1450 /* Set defaults for D0 and D3 states (always valid) */
1451 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1452 device->power.states[ACPI_STATE_D0].power = 100;
1453 device->power.states[ACPI_STATE_D3].flags.valid = 1;
1454 device->power.states[ACPI_STATE_D3].power = 0;
c8f7a62c 1455
5c7dd710
RW		 1456 /* Set D3cold's explicit_set flag if _PS3 exists. */
1457 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1458 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1459
1399dfcd
AL		 1460 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1461 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1462 device->power.flags.power_resources)
1463 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1464
b3785492
RW		 1465 if (acpi_bus_init_power(device)) {
1466 acpi_free_power_resources_lists(device);
1467 device->flags.power_manageable = 0;
1468 }
9e89dde2 1469}
c8f7a62c 1470
d43e167d 1471static void acpi_bus_get_flags(struct acpi_device *device)
1da177e4 1472{
4be44fcd
LB		 1473 acpi_status status = AE_OK;
1474 acpi_handle temp = NULL;
1da177e4 1475
1da177e4
LT		 1476 /* Presence of _STA indicates 'dynamic_status' */
1477 status = acpi_get_handle(device->handle, "_STA", &temp);
1478 if (ACPI_SUCCESS(status))
1479 device->flags.dynamic_status = 1;
1480
1da177e4
LT		 1481 /* Presence of _RMV indicates 'removable' */
1482 status = acpi_get_handle(device->handle, "_RMV", &temp);
1483 if (ACPI_SUCCESS(status))
1484 device->flags.removable = 1;
1485
1486 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1487 status = acpi_get_handle(device->handle, "_EJD", &temp);
1488 if (ACPI_SUCCESS(status))
1489 device->flags.ejectable = 1;
1490 else {
1491 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1492 if (ACPI_SUCCESS(status))
1493 device->flags.ejectable = 1;
1494 }
1da177e4
LT		 1495}
1496
c7bcb4e9 1497static void acpi_device_get_busid(struct acpi_device *device)
1da177e4 1498{
4be44fcd
LB		 1499 char bus_id[5] = { '?', 0 };
1500 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1501 int i = 0;
1da177e4
LT		 1502
1503 /*
1504 * Bus ID
1505 * ------
1506 * The device's Bus ID is simply the object name.
1507 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1508 */
859ac9a4 1509 if (ACPI_IS_ROOT_DEVICE(device)) {
1da177e4 1510 strcpy(device->pnp.bus_id, "ACPI");
859ac9a4
BH		 1511 return;
1512 }
1513
1514 switch (device->device_type) {
1da177e4
LT		 1515 case ACPI_BUS_TYPE_POWER_BUTTON:
1516 strcpy(device->pnp.bus_id, "PWRF");
1517 break;
1518 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1519 strcpy(device->pnp.bus_id, "SLPF");
1520 break;
1521 default:
66b7ed40 1522 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1da177e4
LT		 1523 /* Clean up trailing underscores (if any) */
1524 for (i = 3; i > 1; i--) {
1525 if (bus_id[i] == '_')
1526 bus_id[i] = '\0';
1527 else
1528 break;
1529 }
1530 strcpy(device->pnp.bus_id, bus_id);
1531 break;
1532 }
1533}
1534
54735266 1535/*
d4e1a692 1536 * acpi_bay_match - see if an acpi object is an ejectable driver bay
54735266
ZR		 1537 *
1538 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1539 * then we can safely call it an ejectable drive bay
1540 */
d4e1a692
TK		 1541static int acpi_bay_match(acpi_handle handle)
1542{
54735266 1543 acpi_status status;
54735266
ZR		 1544 acpi_handle tmp;
1545 acpi_handle phandle;
1546
54735266
ZR		 1547 status = acpi_get_handle(handle, "_EJ0", &tmp);
1548 if (ACPI_FAILURE(status))
1549 return -ENODEV;
1550
1551 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1552 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1553 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1554 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1555 return 0;
1556
1557 if (acpi_get_parent(handle, &phandle))
1558 return -ENODEV;
1559
1560 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1561 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1562 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1563 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1564 return 0;
1565
1566 return -ENODEV;
1567}
1568
3620f2f2 1569/*
d4e1a692 1570 * acpi_dock_match - see if an acpi object has a _DCK method
3620f2f2 1571 */
d4e1a692 1572static int acpi_dock_match(acpi_handle handle)
3620f2f2
FS		 1573{
1574 acpi_handle tmp;
d4e1a692 1575 return acpi_get_handle(handle, "_DCK", &tmp);
3620f2f2
FS		 1576}
1577
620e112c 1578const char *acpi_device_hid(struct acpi_device *device)
15b8dd53 1579{
7f47fa6c 1580 struct acpi_hardware_id *hid;
15b8dd53 1581
2b2ae7c7
TR		 1582 if (list_empty(&device->pnp.ids))
1583 return dummy_hid;
1584
7f47fa6c
BH		 1585 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1586 return hid->id;
1587}
1588EXPORT_SYMBOL(acpi_device_hid);
15b8dd53 1589
d4e1a692 1590static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
7f47fa6c
BH		 1591{
1592 struct acpi_hardware_id *id;
15b8dd53 1593
7f47fa6c
BH		 1594 id = kmalloc(sizeof(*id), GFP_KERNEL);
1595 if (!id)
1596 return;
15b8dd53 1597
581de59e 1598 id->id = kstrdup(dev_id, GFP_KERNEL);
7f47fa6c
BH		 1599 if (!id->id) {
1600 kfree(id);
1601 return;
15b8dd53
BM		 1602 }
1603
d4e1a692
TK		 1604 list_add_tail(&id->list, &pnp->ids);
1605 pnp->type.hardware_id = 1;
15b8dd53
BM		 1606}
1607
222e82ac
DW		 1608/*
1609 * Old IBM workstations have a DSDT bug wherein the SMBus object
1610 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1611 * prefix. Work around this.
1612 */
d4e1a692 1613static int acpi_ibm_smbus_match(acpi_handle handle)
222e82ac
DW		 1614{
1615 acpi_handle h_dummy;
1616 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1617 int result;
1618
1619 if (!dmi_name_in_vendors("IBM"))
1620 return -ENODEV;
1621
1622 /* Look for SMBS object */
d4e1a692 1623 result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path);
222e82ac
DW		 1624 if (result)
1625 return result;
1626
1627 if (strcmp("SMBS", path.pointer)) {
1628 result = -ENODEV;
1629 goto out;
1630 }
1631
1632 /* Does it have the necessary (but misnamed) methods? */
1633 result = -ENODEV;
d4e1a692
TK		 1634 if (ACPI_SUCCESS(acpi_get_handle(handle, "SBI", &h_dummy)) &&
1635 ACPI_SUCCESS(acpi_get_handle(handle, "SBR", &h_dummy)) &&
1636 ACPI_SUCCESS(acpi_get_handle(handle, "SBW", &h_dummy)))
222e82ac
DW		 1637 result = 0;
1638out:
1639 kfree(path.pointer);
1640 return result;
1641}
1642
c0af4175
TK		 1643static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1644 int device_type)
1da177e4 1645{
4be44fcd 1646 acpi_status status;
57f3674f 1647 struct acpi_device_info *info;
78e25fef 1648 struct acpi_pnp_device_id_list *cid_list;
7f47fa6c 1649 int i;
1da177e4 1650
c0af4175 1651 switch (device_type) {
1da177e4 1652 case ACPI_BUS_TYPE_DEVICE:
c0af4175
TK		 1653 if (handle == ACPI_ROOT_OBJECT) {
1654 acpi_add_id(pnp, ACPI_SYSTEM_HID);
859ac9a4
BH		 1655 break;
1656 }
1657
c0af4175 1658 status = acpi_get_object_info(handle, &info);
1da177e4 1659 if (ACPI_FAILURE(status)) {
c0af4175
TK		 1660 pr_err(PREFIX "%s: Error reading device info\n",
1661 __func__);
1da177e4
LT		 1662 return;
1663 }
1664
1da177e4 1665 if (info->valid & ACPI_VALID_HID)
c0af4175 1666 acpi_add_id(pnp, info->hardware_id.string);
57f3674f 1667 if (info->valid & ACPI_VALID_CID) {
15b8dd53 1668 cid_list = &info->compatible_id_list;
57f3674f 1669 for (i = 0; i < cid_list->count; i++)
c0af4175 1670 acpi_add_id(pnp, cid_list->ids[i].string);
57f3674f 1671 }
1da177e4 1672 if (info->valid & ACPI_VALID_ADR) {
c0af4175
TK		 1673 pnp->bus_address = info->address;
1674 pnp->type.bus_address = 1;
1da177e4 1675 }
ccf78040 1676 if (info->valid & ACPI_VALID_UID)
c0af4175 1677 pnp->unique_id = kstrdup(info->unique_id.string,
ccf78040 1678 GFP_KERNEL);
ae843332 1679
a83893ae
BH		 1680 kfree(info);
1681
57f3674f
BH		 1682 /*
1683 * Some devices don't reliably have _HIDs & _CIDs, so add
1684 * synthetic HIDs to make sure drivers can find them.
1685 */
c0af4175
TK		 1686 if (acpi_is_video_device(handle))
1687 acpi_add_id(pnp, ACPI_VIDEO_HID);
1688 else if (ACPI_SUCCESS(acpi_bay_match(handle)))
1689 acpi_add_id(pnp, ACPI_BAY_HID);
1690 else if (ACPI_SUCCESS(acpi_dock_match(handle)))
1691 acpi_add_id(pnp, ACPI_DOCK_HID);
1692 else if (!acpi_ibm_smbus_match(handle))
1693 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1694 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1695 acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1696 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1697 strcpy(pnp->device_class, ACPI_BUS_CLASS);
b7b30de5 1698 }
54735266 1699
1da177e4
LT		 1700 break;
1701 case ACPI_BUS_TYPE_POWER:
c0af4175 1702 acpi_add_id(pnp, ACPI_POWER_HID);
1da177e4
LT		 1703 break;
1704 case ACPI_BUS_TYPE_PROCESSOR:
c0af4175 1705 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
1da177e4 1706 break;
1da177e4 1707 case ACPI_BUS_TYPE_THERMAL:
c0af4175 1708 acpi_add_id(pnp, ACPI_THERMAL_HID);
1da177e4
LT		 1709 break;
1710 case ACPI_BUS_TYPE_POWER_BUTTON:
c0af4175 1711 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
1da177e4
LT		 1712 break;
1713 case ACPI_BUS_TYPE_SLEEP_BUTTON:
c0af4175 1714 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
1da177e4
LT		 1715 break;
1716 }
1da177e4
LT		 1717}
1718
c0af4175
TK		 1719void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1720{
1721 struct acpi_hardware_id *id, *tmp;
1722
1723 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1724 kfree(id->id);
1725 kfree(id);
1726 }
1727 kfree(pnp->unique_id);
1728}
1729
82c7d5ef
RW		 1730void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1731 int type, unsigned long long sta)
1da177e4 1732{
d43e167d
RW		 1733 INIT_LIST_HEAD(&device->pnp.ids);
1734 device->device_type = type;
1735 device->handle = handle;
1736 device->parent = acpi_bus_get_parent(handle);
1737 STRUCT_TO_INT(device->status) = sta;
1738 acpi_device_get_busid(device);
c0af4175 1739 acpi_set_pnp_ids(handle, &device->pnp, type);
d43e167d 1740 acpi_bus_get_flags(device);
2c0d4fe0 1741 device->flags.match_driver = false;
cf860be6
RW		 1742 device_initialize(&device->dev);
1743 dev_set_uevent_suppress(&device->dev, true);
1744}
bc3b0772 1745
cf860be6
RW		 1746void acpi_device_add_finalize(struct acpi_device *device)
1747{
2c0d4fe0 1748 device->flags.match_driver = true;
cf860be6
RW		 1749 dev_set_uevent_suppress(&device->dev, false);
1750 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1da177e4
LT		 1751}
1752
5c478f49
BH		 1753static int acpi_add_single_object(struct acpi_device **child,
1754 acpi_handle handle, int type,
2c0d4fe0 1755 unsigned long long sta)
1da177e4 1756{
77c24888
BH		 1757 int result;
1758 struct acpi_device *device;
29aaefa6 1759 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1da177e4 1760
36bcbec7 1761 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1da177e4 1762 if (!device) {
6468463a 1763 printk(KERN_ERR PREFIX "Memory allocation error\n");
d550d98d 1764 return -ENOMEM;
1da177e4 1765 }
1da177e4 1766
d43e167d
RW		 1767 acpi_init_device_object(device, handle, type, sta);
1768 acpi_bus_get_power_flags(device);
d57d09a4 1769 acpi_bus_get_wakeup_device_flags(device);
1da177e4 1770
cf860be6 1771 result = acpi_device_add(device, acpi_device_release);
d43e167d 1772 if (result) {
718fb0de 1773 acpi_device_release(&device->dev);
d43e167d
RW		 1774 return result;
1775 }
1da177e4 1776
d43e167d 1777 acpi_power_add_remove_device(device, true);
cf860be6 1778 acpi_device_add_finalize(device);
d43e167d
RW		 1779 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1780 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1781 dev_name(&device->dev), (char *) buffer.pointer,
1782 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1783 kfree(buffer.pointer);
1784 *child = device;
1785 return 0;
bf325f95
RW		 1786}
1787
778cbc1d
BH		 1788static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1789 unsigned long long *sta)
1da177e4 1790{
778cbc1d
BH		 1791 acpi_status status;
1792 acpi_object_type acpi_type;
1da177e4 1793
778cbc1d 1794 status = acpi_get_type(handle, &acpi_type);
51a85faf 1795 if (ACPI_FAILURE(status))
778cbc1d 1796 return -ENODEV;
4be44fcd 1797
778cbc1d 1798 switch (acpi_type) {
51a85faf
BH		 1799 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1800 case ACPI_TYPE_DEVICE:
778cbc1d
BH		 1801 *type = ACPI_BUS_TYPE_DEVICE;
1802 status = acpi_bus_get_status_handle(handle, sta);
1803 if (ACPI_FAILURE(status))
1804 return -ENODEV;
51a85faf
BH		 1805 break;
1806 case ACPI_TYPE_PROCESSOR:
778cbc1d
BH		 1807 *type = ACPI_BUS_TYPE_PROCESSOR;
1808 status = acpi_bus_get_status_handle(handle, sta);
1809 if (ACPI_FAILURE(status))
1810 return -ENODEV;
51a85faf
BH		 1811 break;
1812 case ACPI_TYPE_THERMAL:
778cbc1d
BH		 1813 *type = ACPI_BUS_TYPE_THERMAL;
1814 *sta = ACPI_STA_DEFAULT;
51a85faf
BH		 1815 break;
1816 case ACPI_TYPE_POWER:
778cbc1d
BH		 1817 *type = ACPI_BUS_TYPE_POWER;
1818 *sta = ACPI_STA_DEFAULT;
51a85faf
BH		 1819 break;
1820 default:
778cbc1d 1821 return -ENODEV;
51a85faf 1822 }
1da177e4 1823
778cbc1d
BH		 1824 return 0;
1825}
1826
4b59cc1f
RW		 1827static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1828 char *idstr,
1829 const struct acpi_device_id **matchid)
1830{
1831 const struct acpi_device_id *devid;
1832
1833 for (devid = handler->ids; devid->id[0]; devid++)
1834 if (!strcmp((char *)devid->id, idstr)) {
1835 if (matchid)
1836 *matchid = devid;
1837
1838 return true;
1839 }
1840
1841 return false;
1842}
1843
6b772e8f
TK		 1844static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1845 const struct acpi_device_id **matchid)
1846{
1847 struct acpi_scan_handler *handler;
1848
1849 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1850 if (acpi_scan_handler_matching(handler, idstr, matchid))
1851 return handler;
1852
1853 return NULL;
1854}
1855
3f8055c3
RW		 1856void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1857{
3f8055c3
RW		 1858 if (!!hotplug->enabled == !!val)
1859 return;
1860
1861 mutex_lock(&acpi_scan_lock);
1862
1863 hotplug->enabled = val;
3f8055c3
RW		 1864
1865 mutex_unlock(&acpi_scan_lock);
1866}
1867
6b772e8f 1868static void acpi_scan_init_hotplug(acpi_handle handle, int type)
a33ec399 1869{
6b772e8f
TK		 1870 struct acpi_device_pnp pnp = {};
1871 struct acpi_hardware_id *hwid;
a33ec399
RW		 1872 struct acpi_scan_handler *handler;
1873
6b772e8f
TK		 1874 INIT_LIST_HEAD(&pnp.ids);
1875 acpi_set_pnp_ids(handle, &pnp, type);
a33ec399 1876
6b772e8f 1877 if (!pnp.type.hardware_id)
7a26b530 1878 goto out;
a33ec399
RW		 1879
1880 /*
1881 * This relies on the fact that acpi_install_notify_handler() will not
1882 * install the same notify handler routine twice for the same handle.
1883 */
6b772e8f
TK		 1884 list_for_each_entry(hwid, &pnp.ids, list) {
1885 handler = acpi_scan_match_handler(hwid->id, NULL);
1886 if (handler) {
2cbb14fb
TK		 1887 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1888 acpi_hotplug_notify_cb, handler);
6b772e8f
TK		 1889 break;
1890 }
1891 }
1892
7a26b530 1893out:
6b772e8f 1894 acpi_free_pnp_ids(&pnp);
a33ec399
RW		 1895}
1896
e3863094
RW		 1897static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1898 void *not_used, void **return_value)
778cbc1d 1899{
805d410f 1900 struct acpi_device *device = NULL;
778cbc1d
BH		 1901 int type;
1902 unsigned long long sta;
e3b87f8a 1903 acpi_status status;
778cbc1d
BH		 1904 int result;
1905
4002bf38
RW		 1906 acpi_bus_get_device(handle, &device);
1907 if (device)
1908 goto out;
1909
778cbc1d
BH		 1910 result = acpi_bus_type_and_status(handle, &type, &sta);
1911 if (result)
1912 return AE_OK;
1913
82c7d5ef
RW		 1914 if (type == ACPI_BUS_TYPE_POWER) {
1915 acpi_add_power_resource(handle);
1916 return AE_OK;
1917 }
1918
6b772e8f 1919 acpi_scan_init_hotplug(handle, type);
a33ec399 1920
778cbc1d 1921 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
b581a7f9 1922 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
86e4e20e
RW		 1923 struct acpi_device_wakeup wakeup;
1924 acpi_handle temp;
1925
1926 status = acpi_get_handle(handle, "_PRW", &temp);
993cbe59 1927 if (ACPI_SUCCESS(status)) {
86e4e20e
RW		 1928 acpi_bus_extract_wakeup_device_power_package(handle,
1929 &wakeup);
993cbe59
RW		 1930 acpi_power_resources_list_free(&wakeup.resources);
1931 }
778cbc1d 1932 return AE_CTRL_DEPTH;
b581a7f9 1933 }
778cbc1d 1934
2c0d4fe0 1935 acpi_add_single_object(&device, handle, type, sta);
e3b87f8a 1936 if (!device)
51a85faf 1937 return AE_CTRL_DEPTH;
1da177e4 1938
4002bf38 1939 out:
51a85faf
BH		 1940 if (!*return_value)
1941 *return_value = device;
805d410f 1942
51a85faf
BH		 1943 return AE_OK;
1944}
3fb02738 1945
c5698074 1946static int acpi_scan_attach_handler(struct acpi_device *device)
ca589f94 1947{
c5698074
RW		 1948 struct acpi_hardware_id *hwid;
1949 int ret = 0;
ca589f94 1950
c5698074 1951 list_for_each_entry(hwid, &device->pnp.ids, list) {
87b85b3c 1952 const struct acpi_device_id *devid;
c5698074 1953 struct acpi_scan_handler *handler;
ca589f94 1954
c5698074
RW		 1955 handler = acpi_scan_match_handler(hwid->id, &devid);
1956 if (handler) {
87b85b3c
RW		 1957 ret = handler->attach(device, devid);
1958 if (ret > 0) {
1959 device->handler = handler;
c5698074 1960 break;
87b85b3c 1961 } else if (ret < 0) {
c5698074 1962 break;
87b85b3c 1963 }
ca589f94
RW		 1964 }
1965 }
1966 return ret;
1967}
1968
0fc300b0
RW		 1969static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1970 void *not_used, void **ret_not_used)
51a85faf 1971{
805d410f
RW		 1972 struct acpi_device *device;
1973 unsigned long long sta_not_used;
ca589f94 1974 int ret;
3fb02738 1975
805d410f
RW		 1976 /*
1977 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1978 * namespace walks prematurely.
1979 */
ca589f94 1980 if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
805d410f 1981 return AE_OK;
1da177e4 1982
805d410f
RW		 1983 if (acpi_bus_get_device(handle, &device))
1984 return AE_CTRL_DEPTH;
7779688f 1985
3a391a39
RW		 1986 if (device->handler)
1987 return AE_OK;
1988
ca589f94
RW		 1989 ret = acpi_scan_attach_handler(device);
1990 if (ret)
1991 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1992
1993 ret = device_attach(&device->dev);
1994 return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1da177e4 1995}
1da177e4 1996
636458de 1997/**
b8bd759a 1998 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
636458de 1999 * @handle: Root of the namespace scope to scan.
7779688f 2000 *
636458de
RW		 2001 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2002 * found devices.
7779688f 2003 *
636458de
RW		 2004 * If no devices were found, -ENODEV is returned, but it does not mean that
2005 * there has been a real error. There just have been no suitable ACPI objects
2006 * in the table trunk from which the kernel could create a device and add an
2007 * appropriate driver.
3757b948
RW		 2008 *
2009 * Must be called under acpi_scan_lock.
7779688f 2010 */
b8bd759a 2011int acpi_bus_scan(acpi_handle handle)
3fb02738 2012{
b8bd759a 2013 void *device = NULL;
c511cc19 2014 int error = 0;
3fb02738 2015
b8bd759a
RW		 2016 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
2017 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2018 acpi_bus_check_add, NULL, NULL, &device);
3fb02738 2019
d2f6650a 2020 if (!device)
c511cc19
RW		 2021 error = -ENODEV;
2022 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
b8bd759a
RW		 2023 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
2024 acpi_bus_device_attach, NULL, NULL, NULL);
3fb02738 2025
c511cc19 2026 return error;
3fb02738 2027}
b8bd759a 2028EXPORT_SYMBOL(acpi_bus_scan);
a2100801 2029
05404d8f
RW		 2030static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
2031 void *not_used, void **ret_not_used)
2032{
2033 struct acpi_device *device = NULL;
a2100801 2034
05404d8f 2035 if (!acpi_bus_get_device(handle, &device)) {
ca589f94
RW		 2036 struct acpi_scan_handler *dev_handler = device->handler;
2037
ca589f94
RW		 2038 if (dev_handler) {
2039 if (dev_handler->detach)
2040 dev_handler->detach(device);
2041
2042 device->handler = NULL;
2043 } else {
2044 device_release_driver(&device->dev);
2045 }
05404d8f
RW		 2046 }
2047 return AE_OK;
3fb02738 2048}
1da177e4 2049
05404d8f
RW		 2050static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
2051 void *not_used, void **ret_not_used)
1da177e4 2052{
05404d8f 2053 struct acpi_device *device = NULL;
4be44fcd 2054
05404d8f
RW		 2055 if (!acpi_bus_get_device(handle, &device))
2056 acpi_device_unregister(device);
1da177e4 2057
05404d8f
RW		 2058 return AE_OK;
2059}
1da177e4 2060
3757b948
RW		 2061/**
2062 * acpi_bus_trim - Remove ACPI device node and all of its descendants
2063 * @start: Root of the ACPI device nodes subtree to remove.
2064 *
2065 * Must be called under acpi_scan_lock.
2066 */
bfee26db 2067void acpi_bus_trim(struct acpi_device *start)
1da177e4 2068{
05404d8f
RW		 2069 /*
2070 * Execute acpi_bus_device_detach() as a post-order callback to detach
2071 * all ACPI drivers from the device nodes being removed.
2072 */
2073 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2074 acpi_bus_device_detach, NULL, NULL);
2075 acpi_bus_device_detach(start->handle, 0, NULL, NULL);
cecdb193
RW		 2076 /*
2077 * Execute acpi_bus_remove() as a post-order callback to remove device
2078 * nodes in the given namespace scope.
2079 */
2080 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
2081 acpi_bus_remove, NULL, NULL);
2082 acpi_bus_remove(start->handle, 0, NULL, NULL);
1da177e4 2083}
ceaba663
KA		 2084EXPORT_SYMBOL_GPL(acpi_bus_trim);
2085
e8b945c9 2086static int acpi_bus_scan_fixed(void)
1da177e4 2087{
4be44fcd 2088 int result = 0;
c4168bff 2089
1da177e4
LT		 2090 /*
2091 * Enumerate all fixed-feature devices.
2092 */
2c0d4fe0
RW		 2093 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2094 struct acpi_device *device = NULL;
2095
5c478f49 2096 result = acpi_add_single_object(&device, NULL,
c4168bff 2097 ACPI_BUS_TYPE_POWER_BUTTON,
2c0d4fe0
RW		 2098 ACPI_STA_DEFAULT);
2099 if (result)
2100 return result;
2101
2102 result = device_attach(&device->dev);
2103 if (result < 0)
2104 return result;
2105
c10d7a13 2106 device_init_wakeup(&device->dev, true);
3fb02738 2107 }
1da177e4 2108
2c0d4fe0
RW		 2109 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2110 struct acpi_device *device = NULL;
2111
5c478f49 2112 result = acpi_add_single_object(&device, NULL,
c4168bff 2113 ACPI_BUS_TYPE_SLEEP_BUTTON,
2c0d4fe0
RW		 2114 ACPI_STA_DEFAULT);
2115 if (result)
2116 return result;
2117
2118 result = device_attach(&device->dev);
3fb02738 2119 }
1da177e4 2120
2c0d4fe0 2121 return result < 0 ? result : 0;
1da177e4
LT		 2122}
2123
e747f274 2124int __init acpi_scan_init(void)
1da177e4
LT		 2125{
2126 int result;
1da177e4 2127
5b327265
PM		 2128 result = bus_register(&acpi_bus_type);
2129 if (result) {
2130 /* We don't want to quit even if we failed to add suspend/resume */
2131 printk(KERN_ERR PREFIX "Could not register bus type\n");
2132 }
2133
92ef2a25 2134 acpi_pci_root_init();
4daeaf68 2135 acpi_pci_link_init();
ac212b69 2136 acpi_processor_init();
141a297b 2137 acpi_platform_init();
f58b082a 2138 acpi_lpss_init();
2fa97feb 2139 acpi_cmos_rtc_init();
737f1a9f 2140 acpi_container_init();
0a347644 2141 acpi_memory_hotplug_init();
94add0f8 2142 acpi_dock_init();
97d9a9e9 2143
3757b948 2144 mutex_lock(&acpi_scan_lock);
1da177e4
LT		 2145 /*
2146 * Enumerate devices in the ACPI namespace.
2147 */
0cd6ac52
RW		 2148 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
2149 if (result)
3757b948 2150 goto out;
1da177e4 2151
0cd6ac52 2152 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1da177e4 2153 if (result)
3757b948 2154 goto out;
1da177e4 2155
b8bd759a
RW		 2156 result = acpi_bus_scan_fixed();
2157 if (result) {
b17b537a 2158 acpi_device_unregister(acpi_root);
3757b948 2159 goto out;
b8bd759a 2160 }
1da177e4 2161
b8bd759a 2162 acpi_update_all_gpes();
3757b948 2163
668192b6
YL		 2164 acpi_pci_root_hp_init();
2165
3757b948
RW		 2166 out:
2167 mutex_unlock(&acpi_scan_lock);
2168 return result;
1da177e4 2169}
Linux 6.x block layer and io_uring tree(s)