blob: 7efe546a8c42704137f3cbae8a3159485f3473b9 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * scan.c - support for transforming the ACPI namespace into individual objects
3 */
4
5#include <linux/module.h>
6#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09007#include <linux/slab.h>
Randy Dunlap9b6d97b2006-07-12 02:08:00 -04008#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/acpi.h>
Alok N Kataria74523c92008-06-13 12:54:24 -040010#include <linux/signal.h>
11#include <linux/kthread.h>
Darrick J. Wong222e82a2010-03-24 14:38:37 +010012#include <linux/dmi.h>
Lance Ortizd1efe3c2012-10-02 12:43:23 -060013#include <linux/nls.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
Rafael J. Wysockid7831562013-11-22 21:52:12 +010015#include <asm/pgtable.h>
16
Bjorn Helgaase60cc7a2009-03-13 12:08:26 -060017#include "internal.h"
18
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#define _COMPONENT ACPI_BUS_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050020ACPI_MODULE_NAME("scan");
Len Brown4be44fc2005-08-05 00:44:28 -040021extern struct acpi_device *acpi_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23#define ACPI_BUS_CLASS "system_bus"
Thomas Renninger29b71a12007-07-23 14:43:51 +020024#define ACPI_BUS_HID "LNXSYBUS"
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#define ACPI_BUS_DEVICE_NAME "System Bus"
26
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +000027#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
28
Rafael J. Wysockid7831562013-11-22 21:52:12 +010029#define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
30
Rafael J. Wysocki683058e2013-05-03 00:26:16 +020031/*
32 * If set, devices will be hot-removed even if they cannot be put offline
33 * gracefully (from the kernel's standpoint).
34 */
35bool acpi_force_hot_remove;
36
Thomas Renninger620e1122010-10-01 10:54:00 +020037static const char *dummy_hid = "device";
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +020038
Zhang Ruie49bd2dd2006-12-08 17:23:43 +080039static LIST_HEAD(acpi_bus_id_list);
Rafael J. Wysockic511cc12013-01-27 21:17:29 +010040static DEFINE_MUTEX(acpi_scan_lock);
Rafael J. Wysockica589f92013-01-30 14:27:29 +010041static LIST_HEAD(acpi_scan_handlers_list);
Shaohua Li90905892009-04-07 10:24:29 +080042DEFINE_MUTEX(acpi_device_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043LIST_HEAD(acpi_wakeup_device_list);
Rafael J. Wysockie5255062014-02-04 00:43:17 +010044static DEFINE_MUTEX(acpi_hp_context_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Zhang Ruie49bd2dd2006-12-08 17:23:43 +080046struct acpi_device_bus_id{
Zhang Ruibb095852007-01-04 15:03:18 +080047 char bus_id[15];
Zhang Ruie49bd2dd2006-12-08 17:23:43 +080048 unsigned int instance_no;
49 struct list_head node;
50};
Thomas Renninger29b71a12007-07-23 14:43:51 +020051
Rafael J. Wysocki3757b942013-02-13 14:36:47 +010052void acpi_scan_lock_acquire(void)
53{
54 mutex_lock(&acpi_scan_lock);
55}
56EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
57
58void acpi_scan_lock_release(void)
59{
60 mutex_unlock(&acpi_scan_lock);
61}
62EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
63
Rafael J. Wysockie5255062014-02-04 00:43:17 +010064void acpi_lock_hp_context(void)
65{
66 mutex_lock(&acpi_hp_context_lock);
67}
68
69void acpi_unlock_hp_context(void)
70{
71 mutex_unlock(&acpi_hp_context_lock);
72}
73
Rafael J. Wysocki5d513202014-02-22 00:48:31 +010074void acpi_initialize_hp_context(struct acpi_device *adev,
75 struct acpi_hotplug_context *hp,
76 int (*notify)(struct acpi_device *, u32),
77 void (*uevent)(struct acpi_device *, u32))
78{
79 acpi_lock_hp_context();
80 acpi_set_hp_context(adev, hp, notify, uevent, NULL);
81 acpi_unlock_hp_context();
82}
83EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
84
Rafael J. Wysockica589f92013-01-30 14:27:29 +010085int acpi_scan_add_handler(struct acpi_scan_handler *handler)
86{
87 if (!handler || !handler->attach)
88 return -EINVAL;
89
90 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
91 return 0;
92}
93
Rafael J. Wysocki3f8055c2013-03-03 23:08:16 +010094int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
95 const char *hotplug_profile_name)
96{
97 int error;
98
99 error = acpi_scan_add_handler(handler);
100 if (error)
101 return error;
102
103 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
104 return 0;
105}
106
Thomas Renninger29b71a12007-07-23 14:43:51 +0200107/*
108 * Creates hid/cid(s) string needed for modalias and uevent
109 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
110 * char *modalias: "acpi:IBM0001:ACPI0001"
Zhang Rui3d8e0092014-01-14 16:46:35 +0800111 * Return: 0: no _HID and no _CID
112 * -EINVAL: output error
113 * -ENOMEM: output is truncated
Thomas Renninger29b71a12007-07-23 14:43:51 +0200114*/
Adrian Bunkb3e572d2007-08-14 23:22:35 +0200115static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
116 int size)
117{
Thomas Renninger29b71a12007-07-23 14:43:51 +0200118 int len;
Zhang Rui5c9fcb52008-03-20 16:40:32 +0800119 int count;
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600120 struct acpi_hardware_id *id;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200121
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200122 if (list_empty(&acpi_dev->pnp.ids))
123 return 0;
124
Zhang Rui5c9fcb52008-03-20 16:40:32 +0800125 len = snprintf(modalias, size, "acpi:");
Thomas Renninger29b71a12007-07-23 14:43:51 +0200126 size -= len;
127
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600128 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
129 count = snprintf(&modalias[len], size, "%s:", id->id);
Zhang Rui3d8e0092014-01-14 16:46:35 +0800130 if (count < 0)
131 return EINVAL;
132 if (count >= size)
133 return -ENOMEM;
Zhang Rui5c9fcb52008-03-20 16:40:32 +0800134 len += count;
135 size -= count;
136 }
137
Thomas Renninger29b71a12007-07-23 14:43:51 +0200138 modalias[len] = '\0';
139 return len;
140}
141
Zhang Rui6eb24512014-01-14 16:46:36 +0800142/*
143 * Creates uevent modalias field for ACPI enumerated devices.
144 * Because the other buses does not support ACPI HIDs & CIDs.
145 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
146 * "acpi:IBM0001:ACPI0001"
147 */
148int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
149{
150 struct acpi_device *acpi_dev;
151 int len;
152
153 acpi_dev = ACPI_COMPANION(dev);
154 if (!acpi_dev)
155 return -ENODEV;
156
157 /* Fall back to bus specific way of modalias exporting */
158 if (list_empty(&acpi_dev->pnp.ids))
159 return -ENODEV;
160
161 if (add_uevent_var(env, "MODALIAS="))
162 return -ENOMEM;
163 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
164 sizeof(env->buf) - env->buflen);
165 if (len <= 0)
166 return len;
167 env->buflen += len;
168 return 0;
169}
170EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);
171
172/*
173 * Creates modalias sysfs attribute for ACPI enumerated devices.
174 * Because the other buses does not support ACPI HIDs & CIDs.
175 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
176 * "acpi:IBM0001:ACPI0001"
177 */
178int acpi_device_modalias(struct device *dev, char *buf, int size)
179{
180 struct acpi_device *acpi_dev;
181 int len;
182
183 acpi_dev = ACPI_COMPANION(dev);
184 if (!acpi_dev)
185 return -ENODEV;
186
187 /* Fall back to bus specific way of modalias exporting */
188 if (list_empty(&acpi_dev->pnp.ids))
189 return -ENODEV;
190
191 len = create_modalias(acpi_dev, buf, size -1);
192 if (len <= 0)
193 return len;
194 buf[len++] = '\n';
195 return len;
196}
197EXPORT_SYMBOL_GPL(acpi_device_modalias);
198
Thomas Renninger29b71a12007-07-23 14:43:51 +0200199static ssize_t
200acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
201 struct acpi_device *acpi_dev = to_acpi_device(dev);
202 int len;
203
Thomas Renninger29b71a12007-07-23 14:43:51 +0200204 len = create_modalias(acpi_dev, buf, 1024);
205 if (len <= 0)
Zhang Rui3d8e0092014-01-14 16:46:35 +0800206 return len;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200207 buf[len++] = '\n';
208 return len;
209}
210static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
211
Rafael J. Wysockicaa73ea2013-12-29 15:25:48 +0100212bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
Rafael J. Wysockid22ddcb2013-12-29 15:25:35 +0100213{
214 struct acpi_device_physical_node *pn;
215 bool offline = true;
216
217 mutex_lock(&adev->physical_node_lock);
218
219 list_for_each_entry(pn, &adev->physical_node_list, node)
220 if (device_supports_offline(pn->dev) && !pn->dev->offline) {
Rafael J. Wysockicaa73ea2013-12-29 15:25:48 +0100221 if (uevent)
222 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
223
Rafael J. Wysockid22ddcb2013-12-29 15:25:35 +0100224 offline = false;
225 break;
226 }
227
228 mutex_unlock(&adev->physical_node_lock);
229 return offline;
230}
231
Rafael J. Wysocki7f28dde2013-11-07 01:41:14 +0100232static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
233 void **ret_p)
Rafael J. Wysocki683058e2013-05-03 00:26:16 +0200234{
235 struct acpi_device *device = NULL;
236 struct acpi_device_physical_node *pn;
Rafael J. Wysocki303bfdb2013-05-23 10:43:13 +0200237 bool second_pass = (bool)data;
Rafael J. Wysocki683058e2013-05-03 00:26:16 +0200238 acpi_status status = AE_OK;
239
240 if (acpi_bus_get_device(handle, &device))
241 return AE_OK;
242
Rafael J. Wysocki7f28dde2013-11-07 01:41:14 +0100243 if (device->handler && !device->handler->hotplug.enabled) {
244 *ret_p = &device->dev;
245 return AE_SUPPORT;
246 }
247
Rafael J. Wysocki683058e2013-05-03 00:26:16 +0200248 mutex_lock(&device->physical_node_lock);
249
250 list_for_each_entry(pn, &device->physical_node_list, node) {
251 int ret;
252
Rafael J. Wysocki303bfdb2013-05-23 10:43:13 +0200253 if (second_pass) {
254 /* Skip devices offlined by the first pass. */
255 if (pn->put_online)
256 continue;
257 } else {
258 pn->put_online = false;
259 }
Rafael J. Wysocki683058e2013-05-03 00:26:16 +0200260 ret = device_offline(pn->dev);
261 if (acpi_force_hot_remove)
262 continue;
263
Rafael J. Wysocki303bfdb2013-05-23 10:43:13 +0200264 if (ret >= 0) {
265 pn->put_online = !ret;
266 } else {
267 *ret_p = pn->dev;
268 if (second_pass) {
269 status = AE_ERROR;
270 break;
271 }
Rafael J. Wysocki683058e2013-05-03 00:26:16 +0200272 }
Rafael J. Wysocki683058e2013-05-03 00:26:16 +0200273 }
274
275 mutex_unlock(&device->physical_node_lock);
276
277 return status;
278}
279
Rafael J. Wysocki7f28dde2013-11-07 01:41:14 +0100280static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
281 void **ret_p)
Rafael J. Wysocki683058e2013-05-03 00:26:16 +0200282{
283 struct acpi_device *device = NULL;
284 struct acpi_device_physical_node *pn;
285
286 if (acpi_bus_get_device(handle, &device))
287 return AE_OK;
288
289 mutex_lock(&device->physical_node_lock);
290
291 list_for_each_entry(pn, &device->physical_node_list, node)
292 if (pn->put_online) {
293 device_online(pn->dev);
294 pn->put_online = false;
295 }
296
297 mutex_unlock(&device->physical_node_lock);
298
299 return AE_OK;
300}
301
Rafael J. Wysockid22ddcb2013-12-29 15:25:35 +0100302static int acpi_scan_try_to_offline(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303{
Yinghai Lu5993c462013-01-11 22:40:41 +0000304 acpi_handle handle = device->handle;
Rafael J. Wysockid22ddcb2013-12-29 15:25:35 +0100305 struct device *errdev = NULL;
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100306 acpi_status status;
Rafael J. Wysockif058cdf2013-02-09 15:29:11 +0100307
Rafael J. Wysocki303bfdb2013-05-23 10:43:13 +0200308 /*
309 * Carry out two passes here and ignore errors in the first pass,
310 * because if the devices in question are memory blocks and
311 * CONFIG_MEMCG is set, one of the blocks may hold data structures
312 * that the other blocks depend on, but it is not known in advance which
313 * block holds them.
314 *
315 * If the first pass is successful, the second one isn't needed, though.
316 */
Rafael J. Wysocki7f28dde2013-11-07 01:41:14 +0100317 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
318 NULL, acpi_bus_offline, (void *)false,
319 (void **)&errdev);
320 if (status == AE_SUPPORT) {
321 dev_warn(errdev, "Offline disabled.\n");
322 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
323 acpi_bus_online, NULL, NULL, NULL);
Rafael J. Wysocki7f28dde2013-11-07 01:41:14 +0100324 return -EPERM;
325 }
326 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
Rafael J. Wysocki303bfdb2013-05-23 10:43:13 +0200327 if (errdev) {
328 errdev = NULL;
Rafael J. Wysocki683058e2013-05-03 00:26:16 +0200329 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
Rafael J. Wysocki7f28dde2013-11-07 01:41:14 +0100330 NULL, acpi_bus_offline, (void *)true,
331 (void **)&errdev);
Rafael J. Wysocki303bfdb2013-05-23 10:43:13 +0200332 if (!errdev || acpi_force_hot_remove)
Rafael J. Wysocki7f28dde2013-11-07 01:41:14 +0100333 acpi_bus_offline(handle, 0, (void *)true,
334 (void **)&errdev);
Rafael J. Wysocki683058e2013-05-03 00:26:16 +0200335
Rafael J. Wysocki303bfdb2013-05-23 10:43:13 +0200336 if (errdev && !acpi_force_hot_remove) {
337 dev_warn(errdev, "Offline failed.\n");
Rafael J. Wysocki7f28dde2013-11-07 01:41:14 +0100338 acpi_bus_online(handle, 0, NULL, NULL);
Rafael J. Wysocki303bfdb2013-05-23 10:43:13 +0200339 acpi_walk_namespace(ACPI_TYPE_ANY, handle,
Rafael J. Wysocki7f28dde2013-11-07 01:41:14 +0100340 ACPI_UINT32_MAX, acpi_bus_online,
341 NULL, NULL, NULL);
Rafael J. Wysocki303bfdb2013-05-23 10:43:13 +0200342 return -EBUSY;
343 }
Rafael J. Wysocki683058e2013-05-03 00:26:16 +0200344 }
Rafael J. Wysockid22ddcb2013-12-29 15:25:35 +0100345 return 0;
346}
347
348static int acpi_scan_hot_remove(struct acpi_device *device)
349{
350 acpi_handle handle = device->handle;
351 unsigned long long sta;
352 acpi_status status;
353
354 if (device->handler->hotplug.demand_offline && !acpi_force_hot_remove) {
Rafael J. Wysockicaa73ea2013-12-29 15:25:48 +0100355 if (!acpi_scan_is_offline(device, true))
Rafael J. Wysockid22ddcb2013-12-29 15:25:35 +0100356 return -EBUSY;
357 } else {
358 int error = acpi_scan_try_to_offline(device);
359 if (error)
360 return error;
361 }
Rafael J. Wysocki683058e2013-05-03 00:26:16 +0200362
Zhang Rui26d46862008-04-29 02:35:48 -0400363 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Kay Sievers07944692008-10-30 01:18:59 +0100364 "Hot-removing device %s...\n", dev_name(&device->dev)));
Zhang Rui26d46862008-04-29 02:35:48 -0400365
Rafael J. Wysockibfee26d2013-01-26 00:27:44 +0100366 acpi_bus_trim(device);
Rafael J. Wysocki683058e2013-05-03 00:26:16 +0200367
Jiang Liu7d2421f2013-06-29 00:24:40 +0800368 acpi_evaluate_lck(handle, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 /*
370 * TBD: _EJD support.
371 */
Jiang Liu7d2421f2013-06-29 00:24:40 +0800372 status = acpi_evaluate_ej0(handle);
373 if (status == AE_NOT_FOUND)
374 return -ENODEV;
375 else if (ACPI_FAILURE(status))
376 return -EIO;
Rafael J. Wysockif058cdf2013-02-09 15:29:11 +0100377
Toshi Kani882fd122013-03-13 19:29:26 +0000378 /*
379 * Verify if eject was indeed successful. If not, log an error
380 * message. No need to call _OST since _EJ0 call was made OK.
381 */
382 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
383 if (ACPI_FAILURE(status)) {
384 acpi_handle_warn(handle,
385 "Status check after eject failed (0x%x)\n", status);
386 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
387 acpi_handle_warn(handle,
388 "Eject incomplete - status 0x%llx\n", sta);
389 }
390
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100391 return 0;
392}
Rafael J. Wysockif058cdf2013-02-09 15:29:11 +0100393
Rafael J. Wysocki443fc822013-11-22 21:55:43 +0100394static int acpi_scan_device_not_present(struct acpi_device *adev)
395{
396 if (!acpi_device_enumerated(adev)) {
397 dev_warn(&adev->dev, "Still not present\n");
398 return -EALREADY;
399 }
400 acpi_bus_trim(adev);
401 return 0;
402}
403
Rafael J. Wysockic27b2c32013-11-22 21:55:07 +0100404static int acpi_scan_device_check(struct acpi_device *adev)
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100405{
Rafael J. Wysockif943db42013-08-28 21:41:07 +0200406 int error;
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100407
Rafael J. Wysocki443fc822013-11-22 21:55:43 +0100408 acpi_bus_get_status(adev);
409 if (adev->status.present || adev->status.functional) {
410 /*
411 * This function is only called for device objects for which
412 * matching scan handlers exist. The only situation in which
413 * the scan handler is not attached to this device object yet
414 * is when the device has just appeared (either it wasn't
415 * present at all before or it was removed and then added
416 * again).
417 */
418 if (adev->handler) {
419 dev_warn(&adev->dev, "Already enumerated\n");
420 return -EALREADY;
421 }
422 error = acpi_bus_scan(adev->handle);
423 if (error) {
424 dev_warn(&adev->dev, "Namespace scan failure\n");
425 return error;
426 }
427 if (!adev->handler) {
428 dev_warn(&adev->dev, "Enumeration failure\n");
429 error = -ENODEV;
430 }
431 } else {
432 error = acpi_scan_device_not_present(adev);
433 }
434 return error;
435}
436
437static int acpi_scan_bus_check(struct acpi_device *adev)
438{
439 struct acpi_scan_handler *handler = adev->handler;
440 struct acpi_device *child;
441 int error;
442
443 acpi_bus_get_status(adev);
444 if (!(adev->status.present || adev->status.functional)) {
445 acpi_scan_device_not_present(adev);
446 return 0;
447 }
448 if (handler && handler->hotplug.scan_dependent)
449 return handler->hotplug.scan_dependent(adev);
450
Rafael J. Wysockic27b2c32013-11-22 21:55:07 +0100451 error = acpi_bus_scan(adev->handle);
452 if (error) {
453 dev_warn(&adev->dev, "Namespace scan failure\n");
454 return error;
455 }
Rafael J. Wysocki443fc822013-11-22 21:55:43 +0100456 list_for_each_entry(child, &adev->children, node) {
457 error = acpi_scan_bus_check(child);
458 if (error)
459 return error;
Rafael J. Wysockic27b2c32013-11-22 21:55:07 +0100460 }
461 return 0;
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100462}
463
Rafael J. Wysocki3c2cc7f2014-02-06 17:31:37 +0100464static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
465{
466 switch (type) {
467 case ACPI_NOTIFY_BUS_CHECK:
468 return acpi_scan_bus_check(adev);
469 case ACPI_NOTIFY_DEVICE_CHECK:
470 return acpi_scan_device_check(adev);
471 case ACPI_NOTIFY_EJECT_REQUEST:
472 case ACPI_OST_EC_OSPM_EJECT:
Rafael J. Wysockidd2151b2014-02-04 00:44:02 +0100473 if (adev->handler && !adev->handler->hotplug.enabled) {
474 dev_info(&adev->dev, "Eject disabled\n");
475 return -EPERM;
476 }
Rafael J. Wysocki700b8422014-02-21 01:07:17 +0100477 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
478 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
Rafael J. Wysocki3c2cc7f2014-02-06 17:31:37 +0100479 return acpi_scan_hot_remove(adev);
480 }
481 return -EINVAL;
482}
483
Rafael J. Wysocki1e3bcb592014-03-03 00:40:38 +0100484void acpi_device_hotplug(struct acpi_device *adev, u32 src)
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100485{
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100486 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
Rafael J. Wysocki3c2cc7f2014-02-06 17:31:37 +0100487 int error = -ENODEV;
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100488
Rafael J. Wysocki683058e2013-05-03 00:26:16 +0200489 lock_device_hotplug();
Rafael J. Wysockie0ae8fe2013-08-30 14:19:29 +0200490 mutex_lock(&acpi_scan_lock);
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100491
Rafael J. Wysockic27b2c32013-11-22 21:55:07 +0100492 /*
493 * The device object's ACPI handle cannot become invalid as long as we
Rafael J. Wysocki3c2cc7f2014-02-06 17:31:37 +0100494 * are holding acpi_scan_lock, but it might have become invalid before
Rafael J. Wysockic27b2c32013-11-22 21:55:07 +0100495 * that lock was acquired.
496 */
497 if (adev->handle == INVALID_ACPI_HANDLE)
Rafael J. Wysocki3c2cc7f2014-02-06 17:31:37 +0100498 goto err_out;
Rafael J. Wysockic27b2c32013-11-22 21:55:07 +0100499
Rafael J. Wysocki1e2380c2014-02-16 01:51:01 +0100500 if (adev->flags.is_dock_station) {
501 error = dock_notify(adev, src);
502 } else if (adev->flags.hotplug_notify) {
Rafael J. Wysocki3c2cc7f2014-02-06 17:31:37 +0100503 error = acpi_generic_hotplug_event(adev, src);
Rafael J. Wysockidd2151b2014-02-04 00:44:02 +0100504 if (error == -EPERM) {
505 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
506 goto err_out;
507 }
Rafael J. Wysocki3c2cc7f2014-02-06 17:31:37 +0100508 } else {
Rafael J. Wysockibe27b3d2014-02-21 01:10:27 +0100509 int (*notify)(struct acpi_device *, u32);
Rafael J. Wysocki3c2cc7f2014-02-06 17:31:37 +0100510
511 acpi_lock_hp_context();
Rafael J. Wysockibe27b3d2014-02-21 01:10:27 +0100512 notify = adev->hp ? adev->hp->notify : NULL;
Rafael J. Wysocki3c2cc7f2014-02-06 17:31:37 +0100513 acpi_unlock_hp_context();
514 /*
515 * There may be additional notify handlers for device objects
516 * without the .event() callback, so ignore them here.
517 */
Rafael J. Wysockibe27b3d2014-02-21 01:10:27 +0100518 if (notify)
519 error = notify(adev, src);
Rafael J. Wysocki3c2cc7f2014-02-06 17:31:37 +0100520 else
521 goto out;
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100522 }
Rafael J. Wysockic27b2c32013-11-22 21:55:07 +0100523 if (!error)
524 ost_code = ACPI_OST_SC_SUCCESS;
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100525
Rafael J. Wysocki3c2cc7f2014-02-06 17:31:37 +0100526 err_out:
Rafael J. Wysocki700b8422014-02-21 01:07:17 +0100527 acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
Rafael J. Wysocki3c2cc7f2014-02-06 17:31:37 +0100528
529 out:
Rafael J. Wysocki78ea4632014-02-04 00:43:05 +0100530 acpi_bus_put_acpi_device(adev);
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100531 mutex_unlock(&acpi_scan_lock);
Rafael J. Wysockie0ae8fe2013-08-30 14:19:29 +0200532 unlock_device_hotplug();
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100533}
534
Rafael J. Wysocki836aedb2013-01-24 12:49:59 +0100535static ssize_t real_power_state_show(struct device *dev,
536 struct device_attribute *attr, char *buf)
537{
538 struct acpi_device *adev = to_acpi_device(dev);
539 int state;
540 int ret;
541
542 ret = acpi_device_get_power(adev, &state);
543 if (ret)
544 return ret;
545
546 return sprintf(buf, "%s\n", acpi_power_state_string(state));
547}
548
549static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
550
551static ssize_t power_state_show(struct device *dev,
552 struct device_attribute *attr, char *buf)
553{
554 struct acpi_device *adev = to_acpi_device(dev);
555
556 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
557}
558
559static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
560
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561static ssize_t
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800562acpi_eject_store(struct device *d, struct device_attribute *attr,
563 const char *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564{
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800565 struct acpi_device *acpi_device = to_acpi_device(d);
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100566 acpi_object_type not_used;
567 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100569 if (!count || buf[0] != '1')
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100572 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
573 && !acpi_device->driver)
574 return -ENODEV;
575
576 status = acpi_get_type(acpi_device->handle, &not_used);
577 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
578 return -ENODEV;
579
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100580 get_device(&acpi_device->dev);
Rafael J. Wysocki1e3bcb592014-03-03 00:40:38 +0100581 status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
Rafael J. Wysockif943db42013-08-28 21:41:07 +0200582 if (ACPI_SUCCESS(status))
583 return count;
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100584
Rafael J. Wysockif943db42013-08-28 21:41:07 +0200585 put_device(&acpi_device->dev);
Rafael J. Wysocki700b8422014-02-21 01:07:17 +0100586 acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
587 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
Rafael J. Wysocki5add99c2013-11-07 01:41:39 +0100588 return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589}
590
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800591static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800593static ssize_t
594acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
595 struct acpi_device *acpi_dev = to_acpi_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
Bjorn Helgaasea8d82f2009-09-21 13:35:09 -0600597 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800598}
599static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
600
Lv Zheng923d4a42012-10-30 14:43:26 +0100601static ssize_t acpi_device_uid_show(struct device *dev,
602 struct device_attribute *attr, char *buf)
603{
604 struct acpi_device *acpi_dev = to_acpi_device(dev);
605
606 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
607}
608static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
609
610static ssize_t acpi_device_adr_show(struct device *dev,
611 struct device_attribute *attr, char *buf)
612{
613 struct acpi_device *acpi_dev = to_acpi_device(dev);
614
615 return sprintf(buf, "0x%08x\n",
616 (unsigned int)(acpi_dev->pnp.bus_address));
617}
618static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
619
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800620static ssize_t
621acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
622 struct acpi_device *acpi_dev = to_acpi_device(dev);
623 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
624 int result;
625
626 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
Alex Chiang0c526d92009-05-14 08:31:37 -0600627 if (result)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800628 goto end;
629
630 result = sprintf(buf, "%s\n", (char*)path.pointer);
631 kfree(path.pointer);
Alex Chiang0c526d92009-05-14 08:31:37 -0600632end:
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800633 return result;
634}
635static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
636
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600637/* sysfs file that shows description text from the ACPI _STR method */
638static ssize_t description_show(struct device *dev,
639 struct device_attribute *attr,
640 char *buf) {
641 struct acpi_device *acpi_dev = to_acpi_device(dev);
642 int result;
643
644 if (acpi_dev->pnp.str_obj == NULL)
645 return 0;
646
647 /*
648 * The _STR object contains a Unicode identifier for a device.
649 * We need to convert to utf-8 so it can be displayed.
650 */
651 result = utf16s_to_utf8s(
652 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
653 acpi_dev->pnp.str_obj->buffer.length,
654 UTF16_LITTLE_ENDIAN, buf,
655 PAGE_SIZE);
656
657 buf[result++] = '\n';
658
659 return result;
660}
661static DEVICE_ATTR(description, 0444, description_show, NULL);
662
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100663static ssize_t
664acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
665 char *buf) {
666 struct acpi_device *acpi_dev = to_acpi_device(dev);
667
668 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
669}
670static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
671
Srinivas Pandruvadac713cd72014-01-10 16:00:05 -0800672static ssize_t status_show(struct device *dev, struct device_attribute *attr,
673 char *buf) {
674 struct acpi_device *acpi_dev = to_acpi_device(dev);
675 acpi_status status;
676 unsigned long long sta;
677
678 status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
679 if (ACPI_FAILURE(status))
680 return -ENODEV;
681
682 return sprintf(buf, "%llu\n", sta);
683}
684static DEVICE_ATTR_RO(status);
685
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800686static int acpi_device_setup_files(struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687{
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600688 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800689 acpi_status status;
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100690 unsigned long long sun;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800691 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800693 /*
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800694 * Devices gotten from FADT don't have a "path" attribute
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800695 */
Alex Chiang0c526d92009-05-14 08:31:37 -0600696 if (dev->handle) {
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800697 result = device_create_file(&dev->dev, &dev_attr_path);
Alex Chiang0c526d92009-05-14 08:31:37 -0600698 if (result)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800699 goto end;
700 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200702 if (!list_empty(&dev->pnp.ids)) {
703 result = device_create_file(&dev->dev, &dev_attr_hid);
704 if (result)
705 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200707 result = device_create_file(&dev->dev, &dev_attr_modalias);
708 if (result)
709 goto end;
710 }
Thomas Renninger29b71a12007-07-23 14:43:51 +0200711
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600712 /*
713 * If device has _STR, 'description' file is created
714 */
Jiang Liu952c63e2013-06-29 00:24:38 +0800715 if (acpi_has_method(dev->handle, "_STR")) {
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600716 status = acpi_evaluate_object(dev->handle, "_STR",
717 NULL, &buffer);
718 if (ACPI_FAILURE(status))
719 buffer.pointer = NULL;
720 dev->pnp.str_obj = buffer.pointer;
721 result = device_create_file(&dev->dev, &dev_attr_description);
722 if (result)
723 goto end;
724 }
725
Toshi Kanid4e1a692013-03-04 21:30:41 +0000726 if (dev->pnp.type.bus_address)
Lv Zheng923d4a42012-10-30 14:43:26 +0100727 result = device_create_file(&dev->dev, &dev_attr_adr);
728 if (dev->pnp.unique_id)
729 result = device_create_file(&dev->dev, &dev_attr_uid);
730
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100731 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
732 if (ACPI_SUCCESS(status)) {
733 dev->pnp.sun = (unsigned long)sun;
734 result = device_create_file(&dev->dev, &dev_attr_sun);
735 if (result)
736 goto end;
737 } else {
738 dev->pnp.sun = (unsigned long)-1;
739 }
740
Srinivas Pandruvadac713cd72014-01-10 16:00:05 -0800741 if (acpi_has_method(dev->handle, "_STA")) {
742 result = device_create_file(&dev->dev, &dev_attr_status);
743 if (result)
744 goto end;
745 }
746
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800747 /*
748 * If device has _EJ0, 'eject' file is created that is used to trigger
749 * hot-removal function from userland.
750 */
Jiang Liu952c63e2013-06-29 00:24:38 +0800751 if (acpi_has_method(dev->handle, "_EJ0")) {
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800752 result = device_create_file(&dev->dev, &dev_attr_eject);
Rafael J. Wysocki836aedb2013-01-24 12:49:59 +0100753 if (result)
754 return result;
755 }
756
757 if (dev->flags.power_manageable) {
758 result = device_create_file(&dev->dev, &dev_attr_power_state);
759 if (result)
760 return result;
761
762 if (dev->power.flags.power_resources)
763 result = device_create_file(&dev->dev,
764 &dev_attr_real_power_state);
765 }
766
Alex Chiang0c526d92009-05-14 08:31:37 -0600767end:
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800768 return result;
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800769}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800771static void acpi_device_remove_files(struct acpi_device *dev)
772{
Rafael J. Wysocki836aedb2013-01-24 12:49:59 +0100773 if (dev->flags.power_manageable) {
774 device_remove_file(&dev->dev, &dev_attr_power_state);
775 if (dev->power.flags.power_resources)
776 device_remove_file(&dev->dev,
777 &dev_attr_real_power_state);
778 }
779
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800780 /*
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600781 * If device has _STR, remove 'description' file
782 */
Jiang Liu952c63e2013-06-29 00:24:38 +0800783 if (acpi_has_method(dev->handle, "_STR")) {
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600784 kfree(dev->pnp.str_obj);
785 device_remove_file(&dev->dev, &dev_attr_description);
786 }
787 /*
788 * If device has _EJ0, remove 'eject' file.
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800789 */
Jiang Liu952c63e2013-06-29 00:24:38 +0800790 if (acpi_has_method(dev->handle, "_EJ0"))
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800791 device_remove_file(&dev->dev, &dev_attr_eject);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800792
Jiang Liu952c63e2013-06-29 00:24:38 +0800793 if (acpi_has_method(dev->handle, "_SUN"))
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100794 device_remove_file(&dev->dev, &dev_attr_sun);
795
Lv Zheng923d4a42012-10-30 14:43:26 +0100796 if (dev->pnp.unique_id)
797 device_remove_file(&dev->dev, &dev_attr_uid);
Toshi Kanid4e1a692013-03-04 21:30:41 +0000798 if (dev->pnp.type.bus_address)
Lv Zheng923d4a42012-10-30 14:43:26 +0100799 device_remove_file(&dev->dev, &dev_attr_adr);
Bjorn Helgaas1131b932009-09-21 13:35:29 -0600800 device_remove_file(&dev->dev, &dev_attr_modalias);
801 device_remove_file(&dev->dev, &dev_attr_hid);
Srinivas Pandruvadac713cd72014-01-10 16:00:05 -0800802 if (acpi_has_method(dev->handle, "_STA"))
803 device_remove_file(&dev->dev, &dev_attr_status);
Alex Chiang0c526d92009-05-14 08:31:37 -0600804 if (dev->handle)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800805 device_remove_file(&dev->dev, &dev_attr_path);
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800806}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807/* --------------------------------------------------------------------------
Zhang Rui9e89dde2006-12-07 20:56:16 +0800808 ACPI Bus operations
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 -------------------------------------------------------------------------- */
Thomas Renninger29b71a12007-07-23 14:43:51 +0200810
Mika Westerbergcf761af2012-10-31 22:44:41 +0100811static const struct acpi_device_id *__acpi_match_device(
812 struct acpi_device *device, const struct acpi_device_id *ids)
Thomas Renninger29b71a12007-07-23 14:43:51 +0200813{
814 const struct acpi_device_id *id;
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600815 struct acpi_hardware_id *hwid;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200816
Zhao Yakui39a0ad82008-08-11 13:40:22 +0800817 /*
818 * If the device is not present, it is unnecessary to load device
819 * driver for it.
820 */
821 if (!device->status.present)
Mika Westerbergcf761af2012-10-31 22:44:41 +0100822 return NULL;
Zhao Yakui39a0ad82008-08-11 13:40:22 +0800823
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600824 for (id = ids; id->id[0]; id++)
825 list_for_each_entry(hwid, &device->pnp.ids, list)
826 if (!strcmp((char *) id->id, hwid->id))
Mika Westerbergcf761af2012-10-31 22:44:41 +0100827 return id;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200828
Mika Westerbergcf761af2012-10-31 22:44:41 +0100829 return NULL;
830}
831
832/**
833 * acpi_match_device - Match a struct device against a given list of ACPI IDs
834 * @ids: Array of struct acpi_device_id object to match against.
835 * @dev: The device structure to match.
836 *
837 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
838 * object for that handle and use that object to match against a given list of
839 * device IDs.
840 *
841 * Return a pointer to the first matching ID on success or %NULL on failure.
842 */
843const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
844 const struct device *dev)
845{
846 struct acpi_device *adev;
Rafael J. Wysocki0613e1f2013-01-31 20:54:05 +0100847 acpi_handle handle = ACPI_HANDLE(dev);
Mika Westerbergcf761af2012-10-31 22:44:41 +0100848
Rafael J. Wysocki0613e1f2013-01-31 20:54:05 +0100849 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
Mika Westerbergcf761af2012-10-31 22:44:41 +0100850 return NULL;
851
852 return __acpi_match_device(adev, ids);
853}
854EXPORT_SYMBOL_GPL(acpi_match_device);
855
856int acpi_match_device_ids(struct acpi_device *device,
857 const struct acpi_device_id *ids)
858{
859 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200860}
861EXPORT_SYMBOL(acpi_match_device_ids);
862
Rafael J. Wysocki0b224522013-01-17 14:11:06 +0100863static void acpi_free_power_resources_lists(struct acpi_device *device)
864{
865 int i;
866
Rafael J. Wysocki993cbe52013-01-17 14:11:06 +0100867 if (device->wakeup.flags.valid)
868 acpi_power_resources_list_free(&device->wakeup.resources);
869
Rafael J. Wysocki0b224522013-01-17 14:11:06 +0100870 if (!device->flags.power_manageable)
871 return;
872
873 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
874 struct acpi_device_power_state *ps = &device->power.states[i];
875 acpi_power_resources_list_free(&ps->resources);
876 }
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600877}
878
Patrick Mochel1890a972006-12-07 20:56:31 +0800879static void acpi_device_release(struct device *dev)
880{
881 struct acpi_device *acpi_dev = to_acpi_device(dev);
882
Toshi Kanic0af4172013-03-04 21:30:42 +0000883 acpi_free_pnp_ids(&acpi_dev->pnp);
Rafael J. Wysocki0b224522013-01-17 14:11:06 +0100884 acpi_free_power_resources_lists(acpi_dev);
Patrick Mochel1890a972006-12-07 20:56:31 +0800885 kfree(acpi_dev);
886}
887
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800888static int acpi_bus_match(struct device *dev, struct device_driver *drv)
889{
890 struct acpi_device *acpi_dev = to_acpi_device(dev);
891 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
892
Rafael J. Wysocki209d3b12012-12-21 00:36:48 +0100893 return acpi_dev->flags.match_driver
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +0100894 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800895}
896
Kay Sievers7eff2e72007-08-14 15:15:12 +0200897static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800898{
899 struct acpi_device *acpi_dev = to_acpi_device(dev);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200900 int len;
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800901
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200902 if (list_empty(&acpi_dev->pnp.ids))
903 return 0;
904
Kay Sievers7eff2e72007-08-14 15:15:12 +0200905 if (add_uevent_var(env, "MODALIAS="))
906 return -ENOMEM;
907 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
908 sizeof(env->buf) - env->buflen);
Zhang Rui3d8e0092014-01-14 16:46:35 +0800909 if (len <= 0)
910 return len;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200911 env->buflen += len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 return 0;
913}
914
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000915static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
916{
917 struct acpi_device *device = data;
918
919 device->driver->ops.notify(device, event);
920}
921
922static acpi_status acpi_device_notify_fixed(void *data)
923{
924 struct acpi_device *device = data;
925
Bjorn Helgaas53de5352009-08-31 22:32:20 +0000926 /* Fixed hardware devices have no handles */
927 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000928 return AE_OK;
929}
930
931static int acpi_device_install_notify_handler(struct acpi_device *device)
932{
933 acpi_status status;
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000934
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000935 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000936 status =
937 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
938 acpi_device_notify_fixed,
939 device);
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000940 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000941 status =
942 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
943 acpi_device_notify_fixed,
944 device);
945 else
946 status = acpi_install_notify_handler(device->handle,
947 ACPI_DEVICE_NOTIFY,
948 acpi_device_notify,
949 device);
950
951 if (ACPI_FAILURE(status))
952 return -EINVAL;
953 return 0;
954}
955
956static void acpi_device_remove_notify_handler(struct acpi_device *device)
957{
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000958 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000959 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
960 acpi_device_notify_fixed);
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000961 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000962 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
963 acpi_device_notify_fixed);
964 else
965 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
966 acpi_device_notify);
967}
968
Rafael J. Wysockid9e455f2013-06-10 13:00:50 +0200969static int acpi_device_probe(struct device *dev)
Zhang Rui9e89dde2006-12-07 20:56:16 +0800970{
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800971 struct acpi_device *acpi_dev = to_acpi_device(dev);
972 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
973 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974
Rafael J. Wysocki24071f42013-06-16 00:36:41 +0200975 if (acpi_dev->handler)
976 return -EINVAL;
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000977
Rafael J. Wysockid9e455f2013-06-10 13:00:50 +0200978 if (!acpi_drv->ops.add)
979 return -ENOSYS;
Li Shaohuac4168bf2006-12-07 20:56:41 +0800980
Rafael J. Wysockid9e455f2013-06-10 13:00:50 +0200981 ret = acpi_drv->ops.add(acpi_dev);
982 if (ret)
983 return ret;
984
985 acpi_dev->driver = acpi_drv;
986 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
987 "Driver [%s] successfully bound to device [%s]\n",
988 acpi_drv->name, acpi_dev->pnp.bus_id));
989
990 if (acpi_drv->ops.notify) {
991 ret = acpi_device_install_notify_handler(acpi_dev);
992 if (ret) {
993 if (acpi_drv->ops.remove)
994 acpi_drv->ops.remove(acpi_dev);
995
996 acpi_dev->driver = NULL;
997 acpi_dev->driver_data = NULL;
998 return ret;
999 }
Zhang Rui9e89dde2006-12-07 20:56:16 +08001000 }
Rafael J. Wysockid9e455f2013-06-10 13:00:50 +02001001
1002 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
1003 acpi_drv->name, acpi_dev->pnp.bus_id));
1004 get_device(dev);
1005 return 0;
Patrick Mochel5d9464a2006-12-07 20:56:27 +08001006}
1007
1008static int acpi_device_remove(struct device * dev)
1009{
1010 struct acpi_device *acpi_dev = to_acpi_device(dev);
1011 struct acpi_driver *acpi_drv = acpi_dev->driver;
1012
1013 if (acpi_drv) {
Bjorn Helgaas46ec8592009-03-30 17:48:13 +00001014 if (acpi_drv->ops.notify)
1015 acpi_device_remove_notify_handler(acpi_dev);
Patrick Mochel5d9464a2006-12-07 20:56:27 +08001016 if (acpi_drv->ops.remove)
Rafael J. Wysocki51fac832013-01-24 00:24:48 +01001017 acpi_drv->ops.remove(acpi_dev);
Patrick Mochel5d9464a2006-12-07 20:56:27 +08001018 }
1019 acpi_dev->driver = NULL;
Pavel Machekdb89b4f2008-09-22 14:37:34 -07001020 acpi_dev->driver_data = NULL;
Patrick Mochel5d9464a2006-12-07 20:56:27 +08001021
1022 put_device(dev);
Zhang Rui9e89dde2006-12-07 20:56:16 +08001023 return 0;
1024}
1025
David Brownell55955aa2007-05-08 00:28:35 -07001026struct bus_type acpi_bus_type = {
Zhang Rui9e89dde2006-12-07 20:56:16 +08001027 .name = "acpi",
Patrick Mochel5d9464a2006-12-07 20:56:27 +08001028 .match = acpi_bus_match,
1029 .probe = acpi_device_probe,
1030 .remove = acpi_device_remove,
1031 .uevent = acpi_device_uevent,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032};
1033
Rafael J. Wysockid7831562013-11-22 21:52:12 +01001034static void acpi_device_del(struct acpi_device *device)
Rafael J. Wysockicaf5c032013-07-30 14:38:34 +02001035{
Rafael J. Wysockid7831562013-11-22 21:52:12 +01001036 mutex_lock(&acpi_device_lock);
1037 if (device->parent)
1038 list_del(&device->node);
1039
1040 list_del(&device->wakeup_list);
1041 mutex_unlock(&acpi_device_lock);
1042
1043 acpi_power_add_remove_device(device, false);
1044 acpi_device_remove_files(device);
1045 if (device->remove)
1046 device->remove(device);
1047
1048 device_del(&device->dev);
1049}
1050
1051static LIST_HEAD(acpi_device_del_list);
1052static DEFINE_MUTEX(acpi_device_del_lock);
1053
1054static void acpi_device_del_work_fn(struct work_struct *work_not_used)
1055{
1056 for (;;) {
1057 struct acpi_device *adev;
1058
1059 mutex_lock(&acpi_device_del_lock);
1060
1061 if (list_empty(&acpi_device_del_list)) {
1062 mutex_unlock(&acpi_device_del_lock);
1063 break;
1064 }
1065 adev = list_first_entry(&acpi_device_del_list,
1066 struct acpi_device, del_list);
1067 list_del(&adev->del_list);
1068
1069 mutex_unlock(&acpi_device_del_lock);
1070
1071 acpi_device_del(adev);
1072 /*
1073 * Drop references to all power resources that might have been
1074 * used by the device.
1075 */
1076 acpi_power_transition(adev, ACPI_STATE_D3_COLD);
1077 put_device(&adev->dev);
1078 }
1079}
1080
1081/**
1082 * acpi_scan_drop_device - Drop an ACPI device object.
1083 * @handle: Handle of an ACPI namespace node, not used.
1084 * @context: Address of the ACPI device object to drop.
1085 *
1086 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
1087 * namespace node the device object pointed to by @context is attached to.
1088 *
1089 * The unregistration is carried out asynchronously to avoid running
1090 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
1091 * ensure the correct ordering (the device objects must be unregistered in the
1092 * same order in which the corresponding namespace nodes are deleted).
1093 */
1094static void acpi_scan_drop_device(acpi_handle handle, void *context)
1095{
1096 static DECLARE_WORK(work, acpi_device_del_work_fn);
1097 struct acpi_device *adev = context;
1098
1099 mutex_lock(&acpi_device_del_lock);
1100
1101 /*
1102 * Use the ACPI hotplug workqueue which is ordered, so this work item
1103 * won't run after any hotplug work items submitted subsequently. That
1104 * prevents attempts to register device objects identical to those being
1105 * deleted from happening concurrently (such attempts result from
1106 * hotplug events handled via the ACPI hotplug workqueue). It also will
1107 * run after all of the work items submitted previosuly, which helps
1108 * those work items to ensure that they are not accessing stale device
1109 * objects.
1110 */
1111 if (list_empty(&acpi_device_del_list))
1112 acpi_queue_hotplug_work(&work);
1113
1114 list_add_tail(&adev->del_list, &acpi_device_del_list);
1115 /* Make acpi_ns_validate_handle() return NULL for this handle. */
1116 adev->handle = INVALID_ACPI_HANDLE;
1117
1118 mutex_unlock(&acpi_device_del_lock);
Rafael J. Wysockicaf5c032013-07-30 14:38:34 +02001119}
1120
Rafael J. Wysocki78ea4632014-02-04 00:43:05 +01001121static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
1122 void (*callback)(void *))
Rafael J. Wysockicaf5c032013-07-30 14:38:34 +02001123{
1124 acpi_status status;
1125
1126 if (!device)
1127 return -EINVAL;
1128
Rafael J. Wysocki78ea4632014-02-04 00:43:05 +01001129 status = acpi_get_data_full(handle, acpi_scan_drop_device,
1130 (void **)device, callback);
Rafael J. Wysockicaf5c032013-07-30 14:38:34 +02001131 if (ACPI_FAILURE(status) || !*device) {
1132 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
1133 handle));
1134 return -ENODEV;
1135 }
1136 return 0;
1137}
Rafael J. Wysocki78ea4632014-02-04 00:43:05 +01001138
1139int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
1140{
1141 return acpi_get_device_data(handle, device, NULL);
1142}
Rafael J. Wysocki65859252013-10-01 23:02:43 +02001143EXPORT_SYMBOL(acpi_bus_get_device);
Rafael J. Wysockicaf5c032013-07-30 14:38:34 +02001144
Rafael J. Wysocki78ea4632014-02-04 00:43:05 +01001145static void get_acpi_device(void *dev)
1146{
1147 if (dev)
1148 get_device(&((struct acpi_device *)dev)->dev);
1149}
1150
1151struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
1152{
1153 struct acpi_device *adev = NULL;
1154
1155 acpi_get_device_data(handle, &adev, get_acpi_device);
1156 return adev;
1157}
1158
1159void acpi_bus_put_acpi_device(struct acpi_device *adev)
1160{
1161 put_device(&adev->dev);
1162}
1163
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001164int acpi_device_add(struct acpi_device *device,
1165 void (*release)(struct device *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166{
Zhang Ruie49bd2dd2006-12-08 17:23:43 +08001167 int result;
1168 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
1169 int found = 0;
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +00001170
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001171 if (device->handle) {
1172 acpi_status status;
1173
Rafael J. Wysockid7831562013-11-22 21:52:12 +01001174 status = acpi_attach_data(device->handle, acpi_scan_drop_device,
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001175 device);
1176 if (ACPI_FAILURE(status)) {
1177 acpi_handle_err(device->handle,
1178 "Unable to attach device data\n");
1179 return -ENODEV;
1180 }
1181 }
1182
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 /*
1184 * Linkage
1185 * -------
1186 * Link this device to its parent and siblings.
1187 */
1188 INIT_LIST_HEAD(&device->children);
1189 INIT_LIST_HEAD(&device->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 INIT_LIST_HEAD(&device->wakeup_list);
Lan Tianyu1033f902012-08-17 14:44:09 +08001191 INIT_LIST_HEAD(&device->physical_node_list);
Rafael J. Wysockid7831562013-11-22 21:52:12 +01001192 INIT_LIST_HEAD(&device->del_list);
Lan Tianyu1033f902012-08-17 14:44:09 +08001193 mutex_init(&device->physical_node_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194
Zhang Ruie49bd2dd2006-12-08 17:23:43 +08001195 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
1196 if (!new_bus_id) {
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001197 pr_err(PREFIX "Memory allocation error\n");
1198 result = -ENOMEM;
1199 goto err_detach;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +08001200 }
1201
Shaohua Li90905892009-04-07 10:24:29 +08001202 mutex_lock(&acpi_device_lock);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +08001203 /*
1204 * Find suitable bus_id and instance number in acpi_bus_id_list
1205 * If failed, create one and link it into acpi_bus_id_list
1206 */
1207 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
Bjorn Helgaas1131b932009-09-21 13:35:29 -06001208 if (!strcmp(acpi_device_bus_id->bus_id,
1209 acpi_device_hid(device))) {
1210 acpi_device_bus_id->instance_no++;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +08001211 found = 1;
1212 kfree(new_bus_id);
1213 break;
1214 }
1215 }
Alex Chiang0c526d92009-05-14 08:31:37 -06001216 if (!found) {
Zhang Ruie49bd2dd2006-12-08 17:23:43 +08001217 acpi_device_bus_id = new_bus_id;
Bjorn Helgaas1131b932009-09-21 13:35:29 -06001218 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
Zhang Ruie49bd2dd2006-12-08 17:23:43 +08001219 acpi_device_bus_id->instance_no = 0;
1220 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
1221 }
Kay Sievers07944692008-10-30 01:18:59 +01001222 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +08001223
Len Brown33b57152008-12-15 22:09:26 -05001224 if (device->parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 list_add_tail(&device->node, &device->parent->children);
Len Brown33b57152008-12-15 22:09:26 -05001226
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 if (device->wakeup.flags.valid)
1228 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
Shaohua Li90905892009-04-07 10:24:29 +08001229 mutex_unlock(&acpi_device_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230
Patrick Mochel1890a972006-12-07 20:56:31 +08001231 if (device->parent)
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +00001232 device->dev.parent = &device->parent->dev;
Patrick Mochel1890a972006-12-07 20:56:31 +08001233 device->dev.bus = &acpi_bus_type;
Rafael J. Wysocki82c7d5e2013-01-17 14:11:05 +01001234 device->dev.release = release;
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001235 result = device_add(&device->dev);
Alex Chiang0c526d92009-05-14 08:31:37 -06001236 if (result) {
Alex Chiang8b12b922009-05-14 08:31:32 -06001237 dev_err(&device->dev, "Error registering device\n");
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001238 goto err;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +08001239 }
Patrick Mochelf883d9d2006-12-07 20:56:38 +08001240
Zhang Ruie49bd2dd2006-12-08 17:23:43 +08001241 result = acpi_device_setup_files(device);
Alex Chiang0c526d92009-05-14 08:31:37 -06001242 if (result)
Kay Sievers07944692008-10-30 01:18:59 +01001243 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
1244 dev_name(&device->dev));
Zhang Ruie49bd2dd2006-12-08 17:23:43 +08001245
Zhang Ruie49bd2dd2006-12-08 17:23:43 +08001246 return 0;
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001247
1248 err:
Shaohua Li90905892009-04-07 10:24:29 +08001249 mutex_lock(&acpi_device_lock);
Len Brown33b57152008-12-15 22:09:26 -05001250 if (device->parent)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +08001251 list_del(&device->node);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +08001252 list_del(&device->wakeup_list);
Shaohua Li90905892009-04-07 10:24:29 +08001253 mutex_unlock(&acpi_device_lock);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001254
1255 err_detach:
Rafael J. Wysockid7831562013-11-22 21:52:12 +01001256 acpi_detach_data(device->handle, acpi_scan_drop_device);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +08001257 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258}
1259
Zhang Rui9e89dde2006-12-07 20:56:16 +08001260/* --------------------------------------------------------------------------
1261 Driver Management
1262 -------------------------------------------------------------------------- */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263/**
Randy Dunlapd758a8f2006-01-06 01:31:00 -05001264 * acpi_bus_register_driver - register a driver with the ACPI bus
1265 * @driver: driver being registered
1266 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 * Registers a driver with the ACPI bus. Searches the namespace for all
Bjorn Helgaas9d9f7492006-03-28 17:04:00 -05001268 * devices that match the driver's criteria and binds. Returns zero for
1269 * success or a negative error status for failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 */
Len Brown4be44fc2005-08-05 00:44:28 -04001271int acpi_bus_register_driver(struct acpi_driver *driver)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272{
Patrick Mochel1890a972006-12-07 20:56:31 +08001273 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274
1275 if (acpi_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -04001276 return -ENODEV;
Patrick Mochel1890a972006-12-07 20:56:31 +08001277 driver->drv.name = driver->name;
1278 driver->drv.bus = &acpi_bus_type;
1279 driver->drv.owner = driver->owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280
Patrick Mochel1890a972006-12-07 20:56:31 +08001281 ret = driver_register(&driver->drv);
1282 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284
Len Brown4be44fc2005-08-05 00:44:28 -04001285EXPORT_SYMBOL(acpi_bus_register_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286
1287/**
Hanjun Guob27b14c2013-09-22 15:42:41 +08001288 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
Randy Dunlapd758a8f2006-01-06 01:31:00 -05001289 * @driver: driver to unregister
1290 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1292 * devices that match the driver's criteria and unbinds.
1293 */
Bjorn Helgaas06ea8e082006-04-27 05:25:00 -04001294void acpi_bus_unregister_driver(struct acpi_driver *driver)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295{
Patrick Mochel1890a972006-12-07 20:56:31 +08001296 driver_unregister(&driver->drv);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297}
Len Brown4be44fc2005-08-05 00:44:28 -04001298
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299EXPORT_SYMBOL(acpi_bus_unregister_driver);
1300
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301/* --------------------------------------------------------------------------
1302 Device Enumeration
1303 -------------------------------------------------------------------------- */
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001304static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1305{
Rafael J. Wysocki456de892013-01-31 20:57:40 +01001306 struct acpi_device *device = NULL;
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001307 acpi_status status;
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001308
1309 /*
1310 * Fixed hardware devices do not appear in the namespace and do not
1311 * have handles, but we fabricate acpi_devices for them, so we have
1312 * to deal with them specially.
1313 */
Rafael J. Wysocki456de892013-01-31 20:57:40 +01001314 if (!handle)
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001315 return acpi_root;
1316
1317 do {
1318 status = acpi_get_parent(handle, &handle);
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001319 if (ACPI_FAILURE(status))
Rafael J. Wysocki456de892013-01-31 20:57:40 +01001320 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1321 } while (acpi_bus_get_device(handle, &device));
1322 return device;
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001323}
1324
Len Brownc8f7a622006-07-09 17:22:28 -04001325acpi_status
1326acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1327{
1328 acpi_status status;
1329 acpi_handle tmp;
1330 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1331 union acpi_object *obj;
1332
1333 status = acpi_get_handle(handle, "_EJD", &tmp);
1334 if (ACPI_FAILURE(status))
1335 return status;
1336
1337 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1338 if (ACPI_SUCCESS(status)) {
1339 obj = buffer.pointer;
Holger Macht3b5fee52008-02-14 13:40:34 +01001340 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1341 ejd);
Len Brownc8f7a622006-07-09 17:22:28 -04001342 kfree(buffer.pointer);
1343 }
1344 return status;
1345}
1346EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1347
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001348static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1349 struct acpi_device_wakeup *wakeup)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350{
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001351 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1352 union acpi_object *package = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 union acpi_object *element = NULL;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001354 acpi_status status;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001355 int err = -ENODATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001357 if (!wakeup)
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001358 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359
Rafael J. Wysocki993cbe52013-01-17 14:11:06 +01001360 INIT_LIST_HEAD(&wakeup->resources);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001362 /* _PRW */
1363 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1364 if (ACPI_FAILURE(status)) {
1365 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001366 return err;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001367 }
1368
1369 package = (union acpi_object *)buffer.pointer;
1370
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001371 if (!package || package->package.count < 2)
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001372 goto out;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001373
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 element = &(package->package.elements[0]);
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001375 if (!element)
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001376 goto out;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001377
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378 if (element->type == ACPI_TYPE_PACKAGE) {
1379 if ((element->package.count < 2) ||
1380 (element->package.elements[0].type !=
1381 ACPI_TYPE_LOCAL_REFERENCE)
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001382 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001383 goto out;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001384
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001385 wakeup->gpe_device =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 element->package.elements[0].reference.handle;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001387 wakeup->gpe_number =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 (u32) element->package.elements[1].integer.value;
1389 } else if (element->type == ACPI_TYPE_INTEGER) {
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001390 wakeup->gpe_device = NULL;
1391 wakeup->gpe_number = element->integer.value;
1392 } else {
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001393 goto out;
1394 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395
1396 element = &(package->package.elements[1]);
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001397 if (element->type != ACPI_TYPE_INTEGER)
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001398 goto out;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001399
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001400 wakeup->sleep_state = element->integer.value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001402 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1403 if (err)
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001404 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405
Rafael J. Wysocki0596a522013-01-17 14:11:07 +01001406 if (!list_empty(&wakeup->resources)) {
1407 int sleep_state;
1408
Rafael J. Wysockib5d667e2013-02-23 23:15:21 +01001409 err = acpi_power_wakeup_list_init(&wakeup->resources,
1410 &sleep_state);
1411 if (err) {
1412 acpi_handle_warn(handle, "Retrieving current states "
1413 "of wakeup power resources failed\n");
1414 acpi_power_resources_list_free(&wakeup->resources);
1415 goto out;
1416 }
Rafael J. Wysocki0596a522013-01-17 14:11:07 +01001417 if (sleep_state < wakeup->sleep_state) {
1418 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1419 "(S%d) by S%d from power resources\n",
1420 (int)wakeup->sleep_state, sleep_state);
1421 wakeup->sleep_state = sleep_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 }
Lin Mingbba63a22010-12-13 13:39:17 +08001424 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
Rafael J. Wysocki98746472010-07-08 00:43:36 +02001425
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001426 out:
1427 kfree(buffer.pointer);
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001428 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429}
1430
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001431static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432{
Thomas Renninger29b71a12007-07-23 14:43:51 +02001433 struct acpi_device_id button_device_ids[] = {
Thomas Renninger29b71a12007-07-23 14:43:51 +02001434 {"PNP0C0C", 0},
Zhang Ruib7e38302012-12-04 23:23:16 +01001435 {"PNP0C0D", 0},
Thomas Renninger29b71a12007-07-23 14:43:51 +02001436 {"PNP0C0E", 0},
1437 {"", 0},
1438 };
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001439 acpi_status status;
1440 acpi_event_status event_status;
1441
Rafael J. Wysockib67ea762010-02-17 23:44:09 +01001442 device->wakeup.flags.notifier_present = 0;
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001443
1444 /* Power button, Lid switch always enable wakeup */
1445 if (!acpi_match_device_ids(device, button_device_ids)) {
1446 device->wakeup.flags.run_wake = 1;
Zhang Ruib7e38302012-12-04 23:23:16 +01001447 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1448 /* Do not use Lid/sleep button for S5 wakeup */
1449 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1450 device->wakeup.sleep_state = ACPI_STATE_S4;
1451 }
Rafael J. Wysockif2b56bc2011-01-06 23:34:22 +01001452 device_set_wakeup_capable(&device->dev, true);
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001453 return;
1454 }
1455
Rafael J. Wysockie8e18c92010-07-08 00:42:51 +02001456 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1457 device->wakeup.gpe_number,
1458 &event_status);
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001459 if (status == AE_OK)
1460 device->wakeup.flags.run_wake =
1461 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1462}
1463
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001464static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001465{
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001466 int err;
Thomas Renninger29b71a12007-07-23 14:43:51 +02001467
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001468 /* Presence of _PRW indicates wake capable */
Jiang Liu952c63e2013-06-29 00:24:38 +08001469 if (!acpi_has_method(device->handle, "_PRW"))
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001470 return;
1471
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001472 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1473 &device->wakeup);
1474 if (err) {
1475 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001476 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477 }
1478
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479 device->wakeup.flags.valid = 1;
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +02001480 device->wakeup.prepare_count = 0;
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001481 acpi_bus_set_run_wake_flags(device);
Zhao Yakui729b2bd2008-03-19 13:26:54 +08001482 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1483 * system for the ACPI device with the _PRW object.
1484 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1485 * So it is necessary to call _DSW object first. Only when it is not
1486 * present will the _PSW object used.
1487 */
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001488 err = acpi_device_sleep_wake(device, 0, 0, 0);
1489 if (err)
Rafael J. Wysocki77e76602008-07-07 03:33:34 +02001490 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1491 "error in _DSW or _PSW evaluation\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492}
1493
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001494static void acpi_bus_init_power_state(struct acpi_device *device, int state)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495{
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001496 struct acpi_device_power_state *ps = &device->power.states[state];
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001497 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1498 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001499 acpi_status status;
Zhang Rui9e89dde2006-12-07 20:56:16 +08001500
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001501 INIT_LIST_HEAD(&ps->resources);
1502
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001503 /* Evaluate "_PRx" to get referenced power resources */
1504 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1505 if (ACPI_SUCCESS(status)) {
1506 union acpi_object *package = buffer.pointer;
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001507
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001508 if (buffer.length && package
1509 && package->type == ACPI_TYPE_PACKAGE
1510 && package->package.count) {
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001511 int err = acpi_extract_power_resources(package, 0,
1512 &ps->resources);
1513 if (!err)
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001514 device->power.flags.power_resources = 1;
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001515 }
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001516 ACPI_FREE(buffer.pointer);
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001517 }
1518
1519 /* Evaluate "_PSx" to see if we can do explicit sets */
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001520 pathname[2] = 'S';
Jiang Liu952c63e2013-06-29 00:24:38 +08001521 if (acpi_has_method(device->handle, pathname))
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001522 ps->flags.explicit_set = 1;
1523
1524 /*
1525 * State is valid if there are means to put the device into it.
1526 * D3hot is only valid if _PR3 present.
1527 */
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001528 if (!list_empty(&ps->resources)
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001529 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1530 ps->flags.valid = 1;
1531 ps->flags.os_accessible = 1;
1532 }
1533
1534 ps->power = -1; /* Unknown - driver assigned */
1535 ps->latency = -1; /* Unknown - driver assigned */
1536}
1537
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001538static void acpi_bus_get_power_flags(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539{
Rafael J. Wysocki8bc50532013-01-17 14:11:07 +01001540 u32 i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001542 /* Presence of _PS0|_PR0 indicates 'power manageable' */
Jiang Liu952c63e2013-06-29 00:24:38 +08001543 if (!acpi_has_method(device->handle, "_PS0") &&
1544 !acpi_has_method(device->handle, "_PR0"))
1545 return;
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001546
1547 device->flags.power_manageable = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548
1549 /*
Zhang Rui9e89dde2006-12-07 20:56:16 +08001550 * Power Management Flags
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551 */
Jiang Liu952c63e2013-06-29 00:24:38 +08001552 if (acpi_has_method(device->handle, "_PSC"))
Zhang Rui9e89dde2006-12-07 20:56:16 +08001553 device->power.flags.explicit_get = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +08001554 if (acpi_has_method(device->handle, "_IRC"))
Zhang Rui9e89dde2006-12-07 20:56:16 +08001555 device->power.flags.inrush_current = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556
1557 /*
Zhang Rui9e89dde2006-12-07 20:56:16 +08001558 * Enumerate supported power management states
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559 */
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001560 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1561 acpi_bus_init_power_state(device, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562
Rafael J. Wysocki0b224522013-01-17 14:11:06 +01001563 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564
Zhang Rui9e89dde2006-12-07 20:56:16 +08001565 /* Set defaults for D0 and D3 states (always valid) */
1566 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1567 device->power.states[ACPI_STATE_D0].power = 100;
Rafael J. Wysocki8ad928d2013-07-30 14:36:20 +02001568 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
1569 device->power.states[ACPI_STATE_D3_COLD].power = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570
Rafael J. Wysocki5c7dd712012-05-18 00:39:35 +02001571 /* Set D3cold's explicit_set flag if _PS3 exists. */
1572 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1573 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1574
Aaron Lu1399dfc2012-11-21 23:33:40 +01001575 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1576 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1577 device->power.flags.power_resources)
1578 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1579
Rafael J. Wysockib3785492013-02-01 23:43:02 +01001580 if (acpi_bus_init_power(device)) {
1581 acpi_free_power_resources_lists(device);
1582 device->flags.power_manageable = 0;
1583 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584}
1585
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001586static void acpi_bus_get_flags(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588 /* Presence of _STA indicates 'dynamic_status' */
Jiang Liu952c63e2013-06-29 00:24:38 +08001589 if (acpi_has_method(device->handle, "_STA"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590 device->flags.dynamic_status = 1;
1591
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592 /* Presence of _RMV indicates 'removable' */
Jiang Liu952c63e2013-06-29 00:24:38 +08001593 if (acpi_has_method(device->handle, "_RMV"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001594 device->flags.removable = 1;
1595
1596 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
Jiang Liu952c63e2013-06-29 00:24:38 +08001597 if (acpi_has_method(device->handle, "_EJD") ||
1598 acpi_has_method(device->handle, "_EJ0"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599 device->flags.ejectable = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600}
1601
Bjorn Helgaasc7bcb4e2009-09-21 19:29:25 +00001602static void acpi_device_get_busid(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603{
Len Brown4be44fc2005-08-05 00:44:28 -04001604 char bus_id[5] = { '?', 0 };
1605 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1606 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607
1608 /*
1609 * Bus ID
1610 * ------
1611 * The device's Bus ID is simply the object name.
1612 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1613 */
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +00001614 if (ACPI_IS_ROOT_DEVICE(device)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615 strcpy(device->pnp.bus_id, "ACPI");
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +00001616 return;
1617 }
1618
1619 switch (device->device_type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620 case ACPI_BUS_TYPE_POWER_BUTTON:
1621 strcpy(device->pnp.bus_id, "PWRF");
1622 break;
1623 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1624 strcpy(device->pnp.bus_id, "SLPF");
1625 break;
1626 default:
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +00001627 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628 /* Clean up trailing underscores (if any) */
1629 for (i = 3; i > 1; i--) {
1630 if (bus_id[i] == '_')
1631 bus_id[i] = '\0';
1632 else
1633 break;
1634 }
1635 strcpy(device->pnp.bus_id, bus_id);
1636 break;
1637 }
1638}
1639
Zhang Rui54735262007-01-11 02:09:09 -05001640/*
Jiang Liuebf4df82013-06-29 00:24:41 +08001641 * acpi_ata_match - see if an acpi object is an ATA device
1642 *
1643 * If an acpi object has one of the ACPI ATA methods defined,
1644 * then we can safely call it an ATA device.
1645 */
1646bool acpi_ata_match(acpi_handle handle)
1647{
1648 return acpi_has_method(handle, "_GTF") ||
1649 acpi_has_method(handle, "_GTM") ||
1650 acpi_has_method(handle, "_STM") ||
1651 acpi_has_method(handle, "_SDD");
1652}
1653
1654/*
Toshi Kanid4e1a692013-03-04 21:30:41 +00001655 * acpi_bay_match - see if an acpi object is an ejectable driver bay
Zhang Rui54735262007-01-11 02:09:09 -05001656 *
1657 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1658 * then we can safely call it an ejectable drive bay
1659 */
Jiang Liuebf4df82013-06-29 00:24:41 +08001660bool acpi_bay_match(acpi_handle handle)
Toshi Kanid4e1a692013-03-04 21:30:41 +00001661{
Zhang Rui54735262007-01-11 02:09:09 -05001662 acpi_handle phandle;
1663
Jiang Liu952c63e2013-06-29 00:24:38 +08001664 if (!acpi_has_method(handle, "_EJ0"))
Jiang Liuebf4df82013-06-29 00:24:41 +08001665 return false;
1666 if (acpi_ata_match(handle))
1667 return true;
1668 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
1669 return false;
Zhang Rui54735262007-01-11 02:09:09 -05001670
Jiang Liuebf4df82013-06-29 00:24:41 +08001671 return acpi_ata_match(phandle);
Zhang Rui54735262007-01-11 02:09:09 -05001672}
1673
Rafael J. Wysockib43109f2014-02-16 00:09:34 +01001674bool acpi_device_is_battery(struct acpi_device *adev)
Rafael J. Wysocki1e2380c2014-02-16 01:51:01 +01001675{
Rafael J. Wysockib43109f2014-02-16 00:09:34 +01001676 struct acpi_hardware_id *hwid;
Rafael J. Wysocki1e2380c2014-02-16 01:51:01 +01001677
Rafael J. Wysockib43109f2014-02-16 00:09:34 +01001678 list_for_each_entry(hwid, &adev->pnp.ids, list)
1679 if (!strcmp("PNP0C0A", hwid->id))
1680 return true;
Rafael J. Wysocki1e2380c2014-02-16 01:51:01 +01001681
Rafael J. Wysockib43109f2014-02-16 00:09:34 +01001682 return false;
Rafael J. Wysocki1e2380c2014-02-16 01:51:01 +01001683}
1684
Rafael J. Wysockib43109f2014-02-16 00:09:34 +01001685static bool is_ejectable_bay(struct acpi_device *adev)
Rafael J. Wysocki1e2380c2014-02-16 01:51:01 +01001686{
Rafael J. Wysockib43109f2014-02-16 00:09:34 +01001687 acpi_handle handle = adev->handle;
1688
1689 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
Rafael J. Wysocki1e2380c2014-02-16 01:51:01 +01001690 return true;
1691
1692 return acpi_bay_match(handle);
1693}
1694
Frank Seidel3620f2f2007-12-07 13:20:34 +01001695/*
Toshi Kanid4e1a692013-03-04 21:30:41 +00001696 * acpi_dock_match - see if an acpi object has a _DCK method
Frank Seidel3620f2f2007-12-07 13:20:34 +01001697 */
Jiang Liuebf4df82013-06-29 00:24:41 +08001698bool acpi_dock_match(acpi_handle handle)
Frank Seidel3620f2f2007-12-07 13:20:34 +01001699{
Jiang Liuebf4df82013-06-29 00:24:41 +08001700 return acpi_has_method(handle, "_DCK");
Frank Seidel3620f2f2007-12-07 13:20:34 +01001701}
1702
Thomas Renninger620e1122010-10-01 10:54:00 +02001703const char *acpi_device_hid(struct acpi_device *device)
Bob Moore15b8dd52009-06-29 13:39:29 +08001704{
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001705 struct acpi_hardware_id *hid;
Bob Moore15b8dd52009-06-29 13:39:29 +08001706
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +02001707 if (list_empty(&device->pnp.ids))
1708 return dummy_hid;
1709
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001710 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1711 return hid->id;
1712}
1713EXPORT_SYMBOL(acpi_device_hid);
Bob Moore15b8dd52009-06-29 13:39:29 +08001714
Toshi Kanid4e1a692013-03-04 21:30:41 +00001715static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001716{
1717 struct acpi_hardware_id *id;
Bob Moore15b8dd52009-06-29 13:39:29 +08001718
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001719 id = kmalloc(sizeof(*id), GFP_KERNEL);
1720 if (!id)
1721 return;
Bob Moore15b8dd52009-06-29 13:39:29 +08001722
Thomas Meyer581de592011-08-06 11:32:56 +02001723 id->id = kstrdup(dev_id, GFP_KERNEL);
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001724 if (!id->id) {
1725 kfree(id);
1726 return;
Bob Moore15b8dd52009-06-29 13:39:29 +08001727 }
1728
Toshi Kanid4e1a692013-03-04 21:30:41 +00001729 list_add_tail(&id->list, &pnp->ids);
1730 pnp->type.hardware_id = 1;
Bob Moore15b8dd52009-06-29 13:39:29 +08001731}
1732
Darrick J. Wong222e82a2010-03-24 14:38:37 +01001733/*
1734 * Old IBM workstations have a DSDT bug wherein the SMBus object
1735 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1736 * prefix. Work around this.
1737 */
Jiang Liuebf4df82013-06-29 00:24:41 +08001738static bool acpi_ibm_smbus_match(acpi_handle handle)
Darrick J. Wong222e82a2010-03-24 14:38:37 +01001739{
Jiang Liuebf4df82013-06-29 00:24:41 +08001740 char node_name[ACPI_PATH_SEGMENT_LENGTH];
1741 struct acpi_buffer path = { sizeof(node_name), node_name };
Darrick J. Wong222e82a2010-03-24 14:38:37 +01001742
1743 if (!dmi_name_in_vendors("IBM"))
Jiang Liuebf4df82013-06-29 00:24:41 +08001744 return false;
Darrick J. Wong222e82a2010-03-24 14:38:37 +01001745
1746 /* Look for SMBS object */
Jiang Liuebf4df82013-06-29 00:24:41 +08001747 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
1748 strcmp("SMBS", path.pointer))
1749 return false;
Darrick J. Wong222e82a2010-03-24 14:38:37 +01001750
1751 /* Does it have the necessary (but misnamed) methods? */
Jiang Liu952c63e2013-06-29 00:24:38 +08001752 if (acpi_has_method(handle, "SBI") &&
1753 acpi_has_method(handle, "SBR") &&
1754 acpi_has_method(handle, "SBW"))
Jiang Liuebf4df82013-06-29 00:24:41 +08001755 return true;
1756
1757 return false;
Darrick J. Wong222e82a2010-03-24 14:38:37 +01001758}
1759
Jiang Liuae3caa82014-02-19 14:02:19 +08001760static bool acpi_object_is_system_bus(acpi_handle handle)
1761{
1762 acpi_handle tmp;
1763
1764 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
1765 tmp == handle)
1766 return true;
1767 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
1768 tmp == handle)
1769 return true;
1770
1771 return false;
1772}
1773
Toshi Kanic0af4172013-03-04 21:30:42 +00001774static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1775 int device_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001776{
Len Brown4be44fc2005-08-05 00:44:28 -04001777 acpi_status status;
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001778 struct acpi_device_info *info;
Lv Zheng78e25fe2012-10-31 02:25:24 +00001779 struct acpi_pnp_device_id_list *cid_list;
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001780 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781
Toshi Kanic0af4172013-03-04 21:30:42 +00001782 switch (device_type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783 case ACPI_BUS_TYPE_DEVICE:
Toshi Kanic0af4172013-03-04 21:30:42 +00001784 if (handle == ACPI_ROOT_OBJECT) {
1785 acpi_add_id(pnp, ACPI_SYSTEM_HID);
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +00001786 break;
1787 }
1788
Toshi Kanic0af4172013-03-04 21:30:42 +00001789 status = acpi_get_object_info(handle, &info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001790 if (ACPI_FAILURE(status)) {
Toshi Kanic0af4172013-03-04 21:30:42 +00001791 pr_err(PREFIX "%s: Error reading device info\n",
1792 __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793 return;
1794 }
1795
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796 if (info->valid & ACPI_VALID_HID)
Toshi Kanic0af4172013-03-04 21:30:42 +00001797 acpi_add_id(pnp, info->hardware_id.string);
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001798 if (info->valid & ACPI_VALID_CID) {
Bob Moore15b8dd52009-06-29 13:39:29 +08001799 cid_list = &info->compatible_id_list;
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001800 for (i = 0; i < cid_list->count; i++)
Toshi Kanic0af4172013-03-04 21:30:42 +00001801 acpi_add_id(pnp, cid_list->ids[i].string);
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001802 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803 if (info->valid & ACPI_VALID_ADR) {
Toshi Kanic0af4172013-03-04 21:30:42 +00001804 pnp->bus_address = info->address;
1805 pnp->type.bus_address = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001806 }
Lv Zhengccf78042012-10-30 14:41:07 +01001807 if (info->valid & ACPI_VALID_UID)
Toshi Kanic0af4172013-03-04 21:30:42 +00001808 pnp->unique_id = kstrdup(info->unique_id.string,
Lv Zhengccf78042012-10-30 14:41:07 +01001809 GFP_KERNEL);
Zhang Ruiae843332006-12-07 20:57:10 +08001810
Bjorn Helgaasa83893ae2009-10-02 11:03:12 -04001811 kfree(info);
1812
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001813 /*
1814 * Some devices don't reliably have _HIDs & _CIDs, so add
1815 * synthetic HIDs to make sure drivers can find them.
1816 */
Toshi Kanic0af4172013-03-04 21:30:42 +00001817 if (acpi_is_video_device(handle))
1818 acpi_add_id(pnp, ACPI_VIDEO_HID);
Jiang Liuebf4df82013-06-29 00:24:41 +08001819 else if (acpi_bay_match(handle))
Toshi Kanic0af4172013-03-04 21:30:42 +00001820 acpi_add_id(pnp, ACPI_BAY_HID);
Jiang Liuebf4df82013-06-29 00:24:41 +08001821 else if (acpi_dock_match(handle))
Toshi Kanic0af4172013-03-04 21:30:42 +00001822 acpi_add_id(pnp, ACPI_DOCK_HID);
Jiang Liuebf4df82013-06-29 00:24:41 +08001823 else if (acpi_ibm_smbus_match(handle))
Toshi Kanic0af4172013-03-04 21:30:42 +00001824 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
Jiang Liuae3caa82014-02-19 14:02:19 +08001825 else if (list_empty(&pnp->ids) &&
1826 acpi_object_is_system_bus(handle)) {
1827 /* \_SB, \_TZ, LNXSYBUS */
1828 acpi_add_id(pnp, ACPI_BUS_HID);
Toshi Kanic0af4172013-03-04 21:30:42 +00001829 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1830 strcpy(pnp->device_class, ACPI_BUS_CLASS);
Bjorn Helgaasb7b30de2010-03-24 10:44:33 -06001831 }
Zhang Rui54735262007-01-11 02:09:09 -05001832
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 break;
1834 case ACPI_BUS_TYPE_POWER:
Toshi Kanic0af4172013-03-04 21:30:42 +00001835 acpi_add_id(pnp, ACPI_POWER_HID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836 break;
1837 case ACPI_BUS_TYPE_PROCESSOR:
Toshi Kanic0af4172013-03-04 21:30:42 +00001838 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840 case ACPI_BUS_TYPE_THERMAL:
Toshi Kanic0af4172013-03-04 21:30:42 +00001841 acpi_add_id(pnp, ACPI_THERMAL_HID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842 break;
1843 case ACPI_BUS_TYPE_POWER_BUTTON:
Toshi Kanic0af4172013-03-04 21:30:42 +00001844 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001845 break;
1846 case ACPI_BUS_TYPE_SLEEP_BUTTON:
Toshi Kanic0af4172013-03-04 21:30:42 +00001847 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001848 break;
1849 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850}
1851
Toshi Kanic0af4172013-03-04 21:30:42 +00001852void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1853{
1854 struct acpi_hardware_id *id, *tmp;
1855
1856 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1857 kfree(id->id);
1858 kfree(id);
1859 }
1860 kfree(pnp->unique_id);
1861}
1862
Rafael J. Wysocki82c7d5e2013-01-17 14:11:05 +01001863void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1864 int type, unsigned long long sta)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865{
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001866 INIT_LIST_HEAD(&device->pnp.ids);
1867 device->device_type = type;
1868 device->handle = handle;
1869 device->parent = acpi_bus_get_parent(handle);
Rafael J. Wysocki25db1152013-11-22 21:56:06 +01001870 acpi_set_device_status(device, sta);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001871 acpi_device_get_busid(device);
Toshi Kanic0af4172013-03-04 21:30:42 +00001872 acpi_set_pnp_ids(handle, &device->pnp, type);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001873 acpi_bus_get_flags(device);
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001874 device->flags.match_driver = false;
Rafael J. Wysocki202317a2013-11-22 21:54:37 +01001875 device->flags.initialized = true;
1876 device->flags.visited = false;
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001877 device_initialize(&device->dev);
1878 dev_set_uevent_suppress(&device->dev, true);
1879}
Bjorn Helgaasbc3b0772009-09-21 19:29:20 +00001880
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001881void acpi_device_add_finalize(struct acpi_device *device)
1882{
1883 dev_set_uevent_suppress(&device->dev, false);
1884 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885}
1886
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001887static int acpi_add_single_object(struct acpi_device **child,
1888 acpi_handle handle, int type,
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001889 unsigned long long sta)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890{
Bjorn Helgaas77c24882009-09-21 19:29:30 +00001891 int result;
1892 struct acpi_device *device;
Bjorn Helgaas29aaefa2009-09-21 19:28:54 +00001893 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894
Burman Yan36bcbec2006-12-19 12:56:11 -08001895 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896 if (!device) {
Len Brown64684632006-06-26 23:41:38 -04001897 printk(KERN_ERR PREFIX "Memory allocation error\n");
Patrick Mocheld550d982006-06-27 00:41:40 -04001898 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001899 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001900
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001901 acpi_init_device_object(device, handle, type, sta);
1902 acpi_bus_get_power_flags(device);
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001903 acpi_bus_get_wakeup_device_flags(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001905 result = acpi_device_add(device, acpi_device_release);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001906 if (result) {
Hugh Dickins718fb0d2009-08-06 23:18:12 +00001907 acpi_device_release(&device->dev);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001908 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909 }
1910
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001911 acpi_power_add_remove_device(device, true);
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001912 acpi_device_add_finalize(device);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001913 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1914 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1915 dev_name(&device->dev), (char *) buffer.pointer,
1916 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1917 kfree(buffer.pointer);
1918 *child = device;
1919 return 0;
Rafael J. Wysockibf325f92010-11-25 00:10:44 +01001920}
1921
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001922static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1923 unsigned long long *sta)
1924{
1925 acpi_status status;
1926 acpi_object_type acpi_type;
1927
1928 status = acpi_get_type(handle, &acpi_type);
1929 if (ACPI_FAILURE(status))
1930 return -ENODEV;
1931
1932 switch (acpi_type) {
1933 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1934 case ACPI_TYPE_DEVICE:
1935 *type = ACPI_BUS_TYPE_DEVICE;
1936 status = acpi_bus_get_status_handle(handle, sta);
1937 if (ACPI_FAILURE(status))
1938 return -ENODEV;
1939 break;
1940 case ACPI_TYPE_PROCESSOR:
1941 *type = ACPI_BUS_TYPE_PROCESSOR;
1942 status = acpi_bus_get_status_handle(handle, sta);
1943 if (ACPI_FAILURE(status))
1944 return -ENODEV;
1945 break;
1946 case ACPI_TYPE_THERMAL:
1947 *type = ACPI_BUS_TYPE_THERMAL;
1948 *sta = ACPI_STA_DEFAULT;
1949 break;
1950 case ACPI_TYPE_POWER:
1951 *type = ACPI_BUS_TYPE_POWER;
1952 *sta = ACPI_STA_DEFAULT;
1953 break;
1954 default:
1955 return -ENODEV;
1956 }
1957
1958 return 0;
1959}
1960
Rafael J. Wysocki202317a2013-11-22 21:54:37 +01001961bool acpi_device_is_present(struct acpi_device *adev)
1962{
1963 if (adev->status.present || adev->status.functional)
1964 return true;
1965
1966 adev->flags.initialized = false;
1967 return false;
1968}
1969
Rafael J. Wysocki4b59cc12013-03-03 23:06:21 +01001970static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1971 char *idstr,
1972 const struct acpi_device_id **matchid)
1973{
1974 const struct acpi_device_id *devid;
1975
1976 for (devid = handler->ids; devid->id[0]; devid++)
1977 if (!strcmp((char *)devid->id, idstr)) {
1978 if (matchid)
1979 *matchid = devid;
1980
1981 return true;
1982 }
1983
1984 return false;
1985}
1986
Toshi Kani6b772e8f2013-03-04 21:30:43 +00001987static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1988 const struct acpi_device_id **matchid)
1989{
1990 struct acpi_scan_handler *handler;
1991
1992 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1993 if (acpi_scan_handler_matching(handler, idstr, matchid))
1994 return handler;
1995
1996 return NULL;
1997}
1998
Rafael J. Wysocki3f8055c2013-03-03 23:08:16 +01001999void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
2000{
Rafael J. Wysocki3f8055c2013-03-03 23:08:16 +01002001 if (!!hotplug->enabled == !!val)
2002 return;
2003
2004 mutex_lock(&acpi_scan_lock);
2005
2006 hotplug->enabled = val;
Rafael J. Wysocki3f8055c2013-03-03 23:08:16 +01002007
2008 mutex_unlock(&acpi_scan_lock);
2009}
2010
Rafael J. Wysocki3c2cc7f2014-02-06 17:31:37 +01002011static void acpi_scan_init_hotplug(struct acpi_device *adev)
Rafael J. Wysockic5698072013-03-03 23:05:14 +01002012{
Toshi Kani6b772e8f2013-03-04 21:30:43 +00002013 struct acpi_hardware_id *hwid;
Rafael J. Wysockic5698072013-03-03 23:05:14 +01002014
Rafael J. Wysockib43109f2014-02-16 00:09:34 +01002015 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
Rafael J. Wysocki1e2380c2014-02-16 01:51:01 +01002016 acpi_dock_add(adev);
2017 return;
2018 }
Rafael J. Wysocki3c2cc7f2014-02-06 17:31:37 +01002019 list_for_each_entry(hwid, &adev->pnp.ids, list) {
2020 struct acpi_scan_handler *handler;
Rafael J. Wysockic5698072013-03-03 23:05:14 +01002021
Toshi Kani6b772e8f2013-03-04 21:30:43 +00002022 handler = acpi_scan_match_handler(hwid->id, NULL);
Rafael J. Wysocki1a699472014-02-06 13:58:13 +01002023 if (handler) {
2024 adev->flags.hotplug_notify = true;
2025 break;
2026 }
Rafael J. Wysocki3c2cc7f2014-02-06 17:31:37 +01002027 }
Rafael J. Wysockia33ec392013-03-03 23:05:29 +01002028}
2029
Rafael J. Wysockie3863092012-12-21 00:36:47 +01002030static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
2031 void *not_used, void **return_value)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032{
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01002033 struct acpi_device *device = NULL;
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00002034 int type;
2035 unsigned long long sta;
2036 int result;
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00002037
Rafael J. Wysocki4002bf32012-12-21 00:36:44 +01002038 acpi_bus_get_device(handle, &device);
2039 if (device)
2040 goto out;
2041
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00002042 result = acpi_bus_type_and_status(handle, &type, &sta);
2043 if (result)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00002044 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002045
Rafael J. Wysocki82c7d5e2013-01-17 14:11:05 +01002046 if (type == ACPI_BUS_TYPE_POWER) {
2047 acpi_add_power_resource(handle);
2048 return AE_OK;
2049 }
2050
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01002051 acpi_add_single_object(&device, handle, type, sta);
Bjorn Helgaase3b87f82009-09-21 19:30:11 +00002052 if (!device)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00002053 return AE_CTRL_DEPTH;
2054
Rafael J. Wysocki3c2cc7f2014-02-06 17:31:37 +01002055 acpi_scan_init_hotplug(device);
2056
Rafael J. Wysocki4002bf32012-12-21 00:36:44 +01002057 out:
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00002058 if (!*return_value)
2059 *return_value = device;
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01002060
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00002061 return AE_OK;
2062}
2063
Rafael J. Wysocki87b85b32013-02-06 13:05:22 +01002064static int acpi_scan_attach_handler(struct acpi_device *device)
2065{
2066 struct acpi_hardware_id *hwid;
2067 int ret = 0;
2068
2069 list_for_each_entry(hwid, &device->pnp.ids, list) {
Rafael J. Wysockic5698072013-03-03 23:05:14 +01002070 const struct acpi_device_id *devid;
2071 struct acpi_scan_handler *handler;
Rafael J. Wysocki87b85b32013-02-06 13:05:22 +01002072
Rafael J. Wysockic5698072013-03-03 23:05:14 +01002073 handler = acpi_scan_match_handler(hwid->id, &devid);
2074 if (handler) {
Rafael J. Wysocki9cb32ac2014-02-11 00:35:46 +01002075 device->handler = handler;
Rafael J. Wysockic5698072013-03-03 23:05:14 +01002076 ret = handler->attach(device, devid);
Rafael J. Wysocki9cb32ac2014-02-11 00:35:46 +01002077 if (ret > 0)
Rafael J. Wysockic5698072013-03-03 23:05:14 +01002078 break;
Rafael J. Wysocki9cb32ac2014-02-11 00:35:46 +01002079
2080 device->handler = NULL;
2081 if (ret < 0)
Rafael J. Wysockic5698072013-03-03 23:05:14 +01002082 break;
Rafael J. Wysockic5698072013-03-03 23:05:14 +01002083 }
Rafael J. Wysocki87b85b32013-02-06 13:05:22 +01002084 }
Rafael J. Wysockica589f92013-01-30 14:27:29 +01002085 return ret;
2086}
2087
Rafael J. Wysocki2c22e652013-11-25 00:52:21 +01002088static void acpi_bus_attach(struct acpi_device *device)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00002089{
Rafael J. Wysocki2c22e652013-11-25 00:52:21 +01002090 struct acpi_device *child;
Rafael J. Wysocki1e2380c2014-02-16 01:51:01 +01002091 acpi_handle ejd;
Rafael J. Wysockica589f92013-01-30 14:27:29 +01002092 int ret;
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00002093
Rafael J. Wysocki1e2380c2014-02-16 01:51:01 +01002094 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
2095 register_dock_dependent_device(device, ejd);
2096
Rafael J. Wysocki2c22e652013-11-25 00:52:21 +01002097 acpi_bus_get_status(device);
Rafael J. Wysocki202317a2013-11-22 21:54:37 +01002098 /* Skip devices that are not present. */
Rafael J. Wysocki2c22e652013-11-25 00:52:21 +01002099 if (!acpi_device_is_present(device)) {
2100 device->flags.visited = false;
2101 return;
2102 }
Rafael J. Wysocki3a391a32013-07-12 13:45:59 +02002103 if (device->handler)
Rafael J. Wysocki2c22e652013-11-25 00:52:21 +01002104 goto ok;
Rafael J. Wysocki3a391a32013-07-12 13:45:59 +02002105
Rafael J. Wysocki202317a2013-11-22 21:54:37 +01002106 if (!device->flags.initialized) {
2107 acpi_bus_update_power(device, NULL);
2108 device->flags.initialized = true;
2109 }
Rafael J. Wysocki2c22e652013-11-25 00:52:21 +01002110 device->flags.visited = false;
Rafael J. Wysockica589f92013-01-30 14:27:29 +01002111 ret = acpi_scan_attach_handler(device);
Rafael J. Wysocki69310072013-11-07 01:41:01 +01002112 if (ret < 0)
Rafael J. Wysocki2c22e652013-11-25 00:52:21 +01002113 return;
Rafael J. Wysocki69310072013-11-07 01:41:01 +01002114
2115 device->flags.match_driver = true;
Rafael J. Wysocki2c22e652013-11-25 00:52:21 +01002116 if (!ret) {
2117 ret = device_attach(&device->dev);
2118 if (ret < 0)
2119 return;
2120 }
2121 device->flags.visited = true;
Rafael J. Wysocki202317a2013-11-22 21:54:37 +01002122
2123 ok:
Rafael J. Wysocki2c22e652013-11-25 00:52:21 +01002124 list_for_each_entry(child, &device->children, node)
2125 acpi_bus_attach(child);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002126}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002127
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01002128/**
2129 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2130 * @handle: Root of the namespace scope to scan.
Thomas Renninger77796882010-01-29 17:48:52 +01002131 *
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01002132 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
2133 * found devices.
Thomas Renninger77796882010-01-29 17:48:52 +01002134 *
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01002135 * If no devices were found, -ENODEV is returned, but it does not mean that
2136 * there has been a real error. There just have been no suitable ACPI objects
2137 * in the table trunk from which the kernel could create a device and add an
2138 * appropriate driver.
Rafael J. Wysocki3757b942013-02-13 14:36:47 +01002139 *
2140 * Must be called under acpi_scan_lock.
Thomas Renninger77796882010-01-29 17:48:52 +01002141 */
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01002142int acpi_bus_scan(acpi_handle handle)
Rajesh Shah3fb02732005-04-28 00:25:52 -07002143{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002144 void *device = NULL;
Rajesh Shah3fb02732005-04-28 00:25:52 -07002145
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01002146 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002147 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
Rafael J. Wysockie3863092012-12-21 00:36:47 +01002148 acpi_bus_check_add, NULL, NULL, &device);
Rajesh Shah3fb02732005-04-28 00:25:52 -07002149
Rafael J. Wysocki2c22e652013-11-25 00:52:21 +01002150 if (device) {
2151 acpi_bus_attach(device);
2152 return 0;
2153 }
2154 return -ENODEV;
Rajesh Shah3fb02732005-04-28 00:25:52 -07002155}
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01002156EXPORT_SYMBOL(acpi_bus_scan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002157
Rafael J. Wysocki3757b942013-02-13 14:36:47 +01002158/**
Rafael J. Wysocki2c22e652013-11-25 00:52:21 +01002159 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
2160 * @adev: Root of the ACPI namespace scope to walk.
Rafael J. Wysocki3757b942013-02-13 14:36:47 +01002161 *
2162 * Must be called under acpi_scan_lock.
2163 */
Rafael J. Wysocki2c22e652013-11-25 00:52:21 +01002164void acpi_bus_trim(struct acpi_device *adev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002165{
Rafael J. Wysocki2c22e652013-11-25 00:52:21 +01002166 struct acpi_scan_handler *handler = adev->handler;
2167 struct acpi_device *child;
2168
2169 list_for_each_entry_reverse(child, &adev->children, node)
2170 acpi_bus_trim(child);
2171
Rafael J. Wysockia951c772014-01-27 23:08:09 +01002172 adev->flags.match_driver = false;
Rafael J. Wysocki2c22e652013-11-25 00:52:21 +01002173 if (handler) {
2174 if (handler->detach)
2175 handler->detach(adev);
2176
2177 adev->handler = NULL;
2178 } else {
2179 device_release_driver(&adev->dev);
2180 }
Rafael J. Wysockicecdb192013-01-15 13:24:02 +01002181 /*
Rafael J. Wysocki2c22e652013-11-25 00:52:21 +01002182 * Most likely, the device is going away, so put it into D3cold before
2183 * that.
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01002184 */
Rafael J. Wysocki2c22e652013-11-25 00:52:21 +01002185 acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
2186 adev->flags.initialized = false;
2187 adev->flags.visited = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002188}
Kristen Accardiceaba6632006-02-23 17:56:01 -08002189EXPORT_SYMBOL_GPL(acpi_bus_trim);
2190
Bjorn Helgaase8b945c2009-09-21 19:28:59 +00002191static int acpi_bus_scan_fixed(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002192{
Len Brown4be44fc2005-08-05 00:44:28 -04002193 int result = 0;
Li Shaohuac4168bf2006-12-07 20:56:41 +08002194
Linus Torvalds1da177e2005-04-16 15:20:36 -07002195 /*
2196 * Enumerate all fixed-feature devices.
2197 */
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01002198 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2199 struct acpi_device *device = NULL;
2200
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00002201 result = acpi_add_single_object(&device, NULL,
Li Shaohuac4168bf2006-12-07 20:56:41 +08002202 ACPI_BUS_TYPE_POWER_BUTTON,
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01002203 ACPI_STA_DEFAULT);
2204 if (result)
2205 return result;
2206
Rafael J. Wysocki88346162013-11-18 14:18:47 +01002207 device->flags.match_driver = true;
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01002208 result = device_attach(&device->dev);
2209 if (result < 0)
2210 return result;
2211
Daniel Drakec10d7a12012-05-10 00:08:43 +01002212 device_init_wakeup(&device->dev, true);
Rajesh Shah3fb02732005-04-28 00:25:52 -07002213 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002214
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01002215 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2216 struct acpi_device *device = NULL;
2217
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00002218 result = acpi_add_single_object(&device, NULL,
Li Shaohuac4168bf2006-12-07 20:56:41 +08002219 ACPI_BUS_TYPE_SLEEP_BUTTON,
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01002220 ACPI_STA_DEFAULT);
2221 if (result)
2222 return result;
2223
Rafael J. Wysocki88346162013-11-18 14:18:47 +01002224 device->flags.match_driver = true;
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01002225 result = device_attach(&device->dev);
Rajesh Shah3fb02732005-04-28 00:25:52 -07002226 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002227
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01002228 return result < 0 ? result : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002229}
2230
Bjorn Helgaase747f272009-03-24 16:49:43 -06002231int __init acpi_scan_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002232{
2233 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002234
Patrick Mochel5b327262006-05-10 10:33:00 -04002235 result = bus_register(&acpi_bus_type);
2236 if (result) {
2237 /* We don't want to quit even if we failed to add suspend/resume */
2238 printk(KERN_ERR PREFIX "Could not register bus type\n");
2239 }
2240
Rafael J. Wysocki92ef2a22012-12-21 00:36:40 +01002241 acpi_pci_root_init();
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +01002242 acpi_pci_link_init();
Rafael J. Wysockiac212b62013-05-03 00:26:22 +02002243 acpi_processor_init();
Rafael J. Wysocki141a2972013-01-30 14:27:40 +01002244 acpi_platform_init();
Rafael J. Wysockif58b0822013-03-06 23:46:20 +01002245 acpi_lpss_init();
Lan Tianyu2fa97fe2013-06-05 02:27:50 +00002246 acpi_cmos_rtc_init();
Rafael J. Wysocki737f1a92013-02-08 23:52:39 +01002247 acpi_container_init();
Rafael J. Wysocki0a347642013-03-03 23:18:03 +01002248 acpi_memory_hotplug_init();
Rafael J. Wysocki97d9a9e2010-11-25 00:10:02 +01002249
Rafael J. Wysocki3757b942013-02-13 14:36:47 +01002250 mutex_lock(&acpi_scan_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002251 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002252 * Enumerate devices in the ACPI namespace.
2253 */
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01002254 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002255 if (result)
Rafael J. Wysocki3757b942013-02-13 14:36:47 +01002256 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002257
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01002258 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002259 if (result)
Rafael J. Wysocki3757b942013-02-13 14:36:47 +01002260 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002261
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01002262 result = acpi_bus_scan_fixed();
2263 if (result) {
Rafael J. Wysocki202317a2013-11-22 21:54:37 +01002264 acpi_detach_data(acpi_root->handle, acpi_scan_drop_device);
2265 acpi_device_del(acpi_root);
2266 put_device(&acpi_root->dev);
Rafael J. Wysocki3757b942013-02-13 14:36:47 +01002267 goto out;
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01002268 }
2269
2270 acpi_update_all_gpes();
Rafael J. Wysocki3757b942013-02-13 14:36:47 +01002271
2272 out:
2273 mutex_unlock(&acpi_scan_lock);
2274 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002275}