Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * scan.c - support for transforming the ACPI namespace into individual objects | |
3 | */ | |
4 | ||
5 | #include <linux/module.h> | |
6 | #include <linux/init.h> | |
5a0e3ad6 | 7 | #include <linux/slab.h> |
9b6d97b6 | 8 | #include <linux/kernel.h> |
1da177e4 | 9 | #include <linux/acpi.h> |
74523c90 AK |
10 | #include <linux/signal.h> |
11 | #include <linux/kthread.h> | |
222e82ac | 12 | #include <linux/dmi.h> |
d1efe3c3 | 13 | #include <linux/nls.h> |
1da177e4 | 14 | |
d783156e RW |
15 | #include <asm/pgtable.h> |
16 | ||
e60cc7a6 BH |
17 | #include "internal.h" |
18 | ||
1da177e4 | 19 | #define _COMPONENT ACPI_BUS_COMPONENT |
f52fd66d | 20 | ACPI_MODULE_NAME("scan"); |
4be44fcd | 21 | extern struct acpi_device *acpi_root; |
1da177e4 LT |
22 | |
23 | #define ACPI_BUS_CLASS "system_bus" | |
29b71a1c | 24 | #define ACPI_BUS_HID "LNXSYBUS" |
1da177e4 LT |
25 | #define ACPI_BUS_DEVICE_NAME "System Bus" |
26 | ||
859ac9a4 BH |
27 | #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent) |
28 | ||
d783156e RW |
29 | #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page) |
30 | ||
683058e3 RW |
31 | /* |
32 | * If set, devices will be hot-removed even if they cannot be put offline | |
33 | * gracefully (from the kernel's standpoint). | |
34 | */ | |
35 | bool acpi_force_hot_remove; | |
36 | ||
620e112c | 37 | static const char *dummy_hid = "device"; |
2b2ae7c7 | 38 | |
40e7fcb1 LT |
39 | static LIST_HEAD(acpi_dep_list); |
40 | static DEFINE_MUTEX(acpi_dep_list_lock); | |
e49bd2dd | 41 | static LIST_HEAD(acpi_bus_id_list); |
c511cc19 | 42 | static DEFINE_MUTEX(acpi_scan_lock); |
ca589f94 | 43 | static LIST_HEAD(acpi_scan_handlers_list); |
9090589d | 44 | DEFINE_MUTEX(acpi_device_lock); |
1da177e4 | 45 | LIST_HEAD(acpi_wakeup_device_list); |
e525506f | 46 | static DEFINE_MUTEX(acpi_hp_context_lock); |
1da177e4 | 47 | |
40e7fcb1 LT |
48 | struct acpi_dep_data { |
49 | struct list_head node; | |
50 | acpi_handle master; | |
51 | acpi_handle slave; | |
52 | }; | |
53 | ||
e49bd2dd | 54 | struct acpi_device_bus_id{ |
bb095854 | 55 | char bus_id[15]; |
e49bd2dd ZR |
56 | unsigned int instance_no; |
57 | struct list_head node; | |
1da177e4 | 58 | }; |
29b71a1c | 59 | |
3757b948 RW |
60 | void acpi_scan_lock_acquire(void) |
61 | { | |
62 | mutex_lock(&acpi_scan_lock); | |
63 | } | |
64 | EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire); | |
65 | ||
66 | void acpi_scan_lock_release(void) | |
67 | { | |
68 | mutex_unlock(&acpi_scan_lock); | |
69 | } | |
70 | EXPORT_SYMBOL_GPL(acpi_scan_lock_release); | |
71 | ||
e525506f RW |
72 | void acpi_lock_hp_context(void) |
73 | { | |
74 | mutex_lock(&acpi_hp_context_lock); | |
75 | } | |
76 | ||
77 | void acpi_unlock_hp_context(void) | |
78 | { | |
79 | mutex_unlock(&acpi_hp_context_lock); | |
80 | } | |
81 | ||
5d513205 RW |
82 | void acpi_initialize_hp_context(struct acpi_device *adev, |
83 | struct acpi_hotplug_context *hp, | |
84 | int (*notify)(struct acpi_device *, u32), | |
85 | void (*uevent)(struct acpi_device *, u32)) | |
86 | { | |
87 | acpi_lock_hp_context(); | |
ba574dc8 RW |
88 | hp->notify = notify; |
89 | hp->uevent = uevent; | |
90 | acpi_set_hp_context(adev, hp); | |
5d513205 RW |
91 | acpi_unlock_hp_context(); |
92 | } | |
93 | EXPORT_SYMBOL_GPL(acpi_initialize_hp_context); | |
94 | ||
ca589f94 RW |
95 | int acpi_scan_add_handler(struct acpi_scan_handler *handler) |
96 | { | |
d34afa9d | 97 | if (!handler) |
ca589f94 RW |
98 | return -EINVAL; |
99 | ||
100 | list_add_tail(&handler->list_node, &acpi_scan_handlers_list); | |
101 | return 0; | |
102 | } | |
103 | ||
3f8055c3 RW |
104 | int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler, |
105 | const char *hotplug_profile_name) | |
106 | { | |
107 | int error; | |
108 | ||
109 | error = acpi_scan_add_handler(handler); | |
110 | if (error) | |
111 | return error; | |
112 | ||
113 | acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name); | |
114 | return 0; | |
115 | } | |
116 | ||
8765c5ba RW |
117 | /** |
118 | * create_pnp_modalias - Create hid/cid(s) string for modalias and uevent | |
119 | * @acpi_dev: ACPI device object. | |
120 | * @modalias: Buffer to print into. | |
121 | * @size: Size of the buffer. | |
122 | * | |
29b71a1c TR |
123 | * Creates hid/cid(s) string needed for modalias and uevent |
124 | * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get: | |
125 | * char *modalias: "acpi:IBM0001:ACPI0001" | |
3d8e0090 ZR |
126 | * Return: 0: no _HID and no _CID |
127 | * -EINVAL: output error | |
128 | * -ENOMEM: output is truncated | |
29b71a1c | 129 | */ |
8765c5ba RW |
130 | static int create_pnp_modalias(struct acpi_device *acpi_dev, char *modalias, |
131 | int size) | |
b3e572d2 | 132 | { |
29b71a1c | 133 | int len; |
5c9fcb5d | 134 | int count; |
7f47fa6c | 135 | struct acpi_hardware_id *id; |
29b71a1c | 136 | |
733e6251 | 137 | /* |
ee892094 RW |
138 | * Since we skip ACPI_DT_NAMESPACE_HID from the modalias below, 0 should |
139 | * be returned if ACPI_DT_NAMESPACE_HID is the only ACPI/PNP ID in the | |
140 | * device's list. | |
733e6251 | 141 | */ |
8765c5ba RW |
142 | count = 0; |
143 | list_for_each_entry(id, &acpi_dev->pnp.ids, list) | |
ee892094 | 144 | if (strcmp(id->id, ACPI_DT_NAMESPACE_HID)) |
8765c5ba | 145 | count++; |
733e6251 | 146 | |
8765c5ba RW |
147 | if (!count) |
148 | return 0; | |
149 | ||
150 | len = snprintf(modalias, size, "acpi:"); | |
151 | if (len <= 0) | |
152 | return len; | |
153 | ||
154 | size -= len; | |
155 | ||
156 | list_for_each_entry(id, &acpi_dev->pnp.ids, list) { | |
ee892094 | 157 | if (!strcmp(id->id, ACPI_DT_NAMESPACE_HID)) |
8765c5ba RW |
158 | continue; |
159 | ||
160 | count = snprintf(&modalias[len], size, "%s:", id->id); | |
161 | if (count < 0) | |
162 | return -EINVAL; | |
163 | ||
164 | if (count >= size) | |
165 | return -ENOMEM; | |
166 | ||
167 | len += count; | |
168 | size -= count; | |
5c9fcb5d | 169 | } |
8765c5ba RW |
170 | modalias[len] = '\0'; |
171 | return len; | |
172 | } | |
173 | ||
174 | /** | |
175 | * create_of_modalias - Creates DT compatible string for modalias and uevent | |
176 | * @acpi_dev: ACPI device object. | |
177 | * @modalias: Buffer to print into. | |
178 | * @size: Size of the buffer. | |
179 | * | |
180 | * Expose DT compatible modalias as of:NnameTCcompatible. This function should | |
ee892094 RW |
181 | * only be called for devices having ACPI_DT_NAMESPACE_HID in their list of |
182 | * ACPI/PNP IDs. | |
8765c5ba RW |
183 | */ |
184 | static int create_of_modalias(struct acpi_device *acpi_dev, char *modalias, | |
185 | int size) | |
186 | { | |
187 | struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; | |
188 | const union acpi_object *of_compatible, *obj; | |
189 | int len, count; | |
190 | int i, nval; | |
191 | char *c; | |
5c9fcb5d | 192 | |
8765c5ba RW |
193 | acpi_get_name(acpi_dev->handle, ACPI_SINGLE_NAME, &buf); |
194 | /* DT strings are all in lower case */ | |
195 | for (c = buf.pointer; *c != '\0'; c++) | |
196 | *c = tolower(*c); | |
197 | ||
198 | len = snprintf(modalias, size, "of:N%sT", (char *)buf.pointer); | |
199 | ACPI_FREE(buf.pointer); | |
200 | ||
201 | if (len <= 0) | |
202 | return len; | |
203 | ||
204 | of_compatible = acpi_dev->data.of_compatible; | |
205 | if (of_compatible->type == ACPI_TYPE_PACKAGE) { | |
206 | nval = of_compatible->package.count; | |
207 | obj = of_compatible->package.elements; | |
208 | } else { /* Must be ACPI_TYPE_STRING. */ | |
209 | nval = 1; | |
210 | obj = of_compatible; | |
211 | } | |
212 | for (i = 0; i < nval; i++, obj++) { | |
213 | count = snprintf(&modalias[len], size, "C%s", | |
214 | obj->string.pointer); | |
215 | if (count < 0) | |
216 | return -EINVAL; | |
217 | ||
218 | if (count >= size) | |
219 | return -ENOMEM; | |
220 | ||
221 | len += count; | |
222 | size -= count; | |
223 | } | |
29b71a1c TR |
224 | modalias[len] = '\0'; |
225 | return len; | |
226 | } | |
227 | ||
52870786 MW |
228 | /* |
229 | * acpi_companion_match() - Can we match via ACPI companion device | |
230 | * @dev: Device in question | |
231 | * | |
232 | * Check if the given device has an ACPI companion and if that companion has | |
233 | * a valid list of PNP IDs, and if the device is the first (primary) physical | |
e1acdeb0 RW |
234 | * device associated with it. Return the companion pointer if that's the case |
235 | * or NULL otherwise. | |
52870786 MW |
236 | * |
237 | * If multiple physical devices are attached to a single ACPI companion, we need | |
238 | * to be careful. The usage scenario for this kind of relationship is that all | |
239 | * of the physical devices in question use resources provided by the ACPI | |
240 | * companion. A typical case is an MFD device where all the sub-devices share | |
241 | * the parent's ACPI companion. In such cases we can only allow the primary | |
242 | * (first) physical device to be matched with the help of the companion's PNP | |
243 | * IDs. | |
244 | * | |
245 | * Additional physical devices sharing the ACPI companion can still use | |
246 | * resources available from it but they will be matched normally using functions | |
247 | * provided by their bus types (and analogously for their modalias). | |
248 | */ | |
e1acdeb0 | 249 | static struct acpi_device *acpi_companion_match(const struct device *dev) |
52870786 MW |
250 | { |
251 | struct acpi_device *adev; | |
5f2e3274 | 252 | struct mutex *physical_node_lock; |
52870786 MW |
253 | |
254 | adev = ACPI_COMPANION(dev); | |
255 | if (!adev) | |
e1acdeb0 | 256 | return NULL; |
52870786 MW |
257 | |
258 | if (list_empty(&adev->pnp.ids)) | |
e1acdeb0 | 259 | return NULL; |
52870786 | 260 | |
5f2e3274 RW |
261 | physical_node_lock = &adev->physical_node_lock; |
262 | mutex_lock(physical_node_lock); | |
52870786 | 263 | if (list_empty(&adev->physical_node_list)) { |
e1acdeb0 | 264 | adev = NULL; |
52870786 MW |
265 | } else { |
266 | const struct acpi_device_physical_node *node; | |
267 | ||
268 | node = list_first_entry(&adev->physical_node_list, | |
269 | struct acpi_device_physical_node, node); | |
e1acdeb0 RW |
270 | if (node->dev != dev) |
271 | adev = NULL; | |
52870786 | 272 | } |
5f2e3274 | 273 | mutex_unlock(physical_node_lock); |
52870786 | 274 | |
e1acdeb0 | 275 | return adev; |
52870786 MW |
276 | } |
277 | ||
8765c5ba RW |
278 | static int __acpi_device_uevent_modalias(struct acpi_device *adev, |
279 | struct kobj_uevent_env *env) | |
6eb2451f | 280 | { |
6eb2451f ZR |
281 | int len; |
282 | ||
8765c5ba | 283 | if (!adev) |
6eb2451f ZR |
284 | return -ENODEV; |
285 | ||
8765c5ba RW |
286 | if (list_empty(&adev->pnp.ids)) |
287 | return 0; | |
288 | ||
6eb2451f ZR |
289 | if (add_uevent_var(env, "MODALIAS=")) |
290 | return -ENOMEM; | |
8765c5ba RW |
291 | |
292 | len = create_pnp_modalias(adev, &env->buf[env->buflen - 1], | |
293 | sizeof(env->buf) - env->buflen); | |
294 | if (len < 0) | |
6eb2451f | 295 | return len; |
8765c5ba RW |
296 | |
297 | env->buflen += len; | |
298 | if (!adev->data.of_compatible) | |
299 | return 0; | |
300 | ||
301 | if (len > 0 && add_uevent_var(env, "MODALIAS=")) | |
302 | return -ENOMEM; | |
303 | ||
304 | len = create_of_modalias(adev, &env->buf[env->buflen - 1], | |
305 | sizeof(env->buf) - env->buflen); | |
306 | if (len < 0) | |
307 | return len; | |
308 | ||
6eb2451f | 309 | env->buflen += len; |
8765c5ba | 310 | |
6eb2451f ZR |
311 | return 0; |
312 | } | |
6eb2451f ZR |
313 | |
314 | /* | |
8765c5ba | 315 | * Creates uevent modalias field for ACPI enumerated devices. |
6eb2451f ZR |
316 | * Because the other buses does not support ACPI HIDs & CIDs. |
317 | * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get: | |
318 | * "acpi:IBM0001:ACPI0001" | |
319 | */ | |
8765c5ba | 320 | int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env) |
6eb2451f | 321 | { |
8765c5ba RW |
322 | return __acpi_device_uevent_modalias(acpi_companion_match(dev), env); |
323 | } | |
324 | EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias); | |
325 | ||
326 | static int __acpi_device_modalias(struct acpi_device *adev, char *buf, int size) | |
327 | { | |
328 | int len, count; | |
6eb2451f | 329 | |
8765c5ba | 330 | if (!adev) |
6eb2451f ZR |
331 | return -ENODEV; |
332 | ||
8765c5ba RW |
333 | if (list_empty(&adev->pnp.ids)) |
334 | return 0; | |
335 | ||
336 | len = create_pnp_modalias(adev, buf, size - 1); | |
337 | if (len < 0) { | |
6eb2451f | 338 | return len; |
8765c5ba RW |
339 | } else if (len > 0) { |
340 | buf[len++] = '\n'; | |
341 | size -= len; | |
342 | } | |
343 | if (!adev->data.of_compatible) | |
344 | return len; | |
345 | ||
346 | count = create_of_modalias(adev, buf + len, size - 1); | |
347 | if (count < 0) { | |
348 | return count; | |
349 | } else if (count > 0) { | |
350 | len += count; | |
351 | buf[len++] = '\n'; | |
352 | } | |
353 | ||
6eb2451f ZR |
354 | return len; |
355 | } | |
8765c5ba RW |
356 | |
357 | /* | |
358 | * Creates modalias sysfs attribute for ACPI enumerated devices. | |
359 | * Because the other buses does not support ACPI HIDs & CIDs. | |
360 | * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get: | |
361 | * "acpi:IBM0001:ACPI0001" | |
362 | */ | |
363 | int acpi_device_modalias(struct device *dev, char *buf, int size) | |
364 | { | |
365 | return __acpi_device_modalias(acpi_companion_match(dev), buf, size); | |
366 | } | |
6eb2451f ZR |
367 | EXPORT_SYMBOL_GPL(acpi_device_modalias); |
368 | ||
29b71a1c TR |
369 | static ssize_t |
370 | acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
8765c5ba | 371 | return __acpi_device_modalias(to_acpi_device(dev), buf, 1024); |
29b71a1c TR |
372 | } |
373 | static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL); | |
374 | ||
caa73ea1 | 375 | bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent) |
d22ddcbc RW |
376 | { |
377 | struct acpi_device_physical_node *pn; | |
378 | bool offline = true; | |
379 | ||
4c533c80 RW |
380 | /* |
381 | * acpi_container_offline() calls this for all of the container's | |
382 | * children under the container's physical_node_lock lock. | |
383 | */ | |
384 | mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING); | |
d22ddcbc RW |
385 | |
386 | list_for_each_entry(pn, &adev->physical_node_list, node) | |
387 | if (device_supports_offline(pn->dev) && !pn->dev->offline) { | |
caa73ea1 RW |
388 | if (uevent) |
389 | kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE); | |
390 | ||
d22ddcbc RW |
391 | offline = false; |
392 | break; | |
393 | } | |
394 | ||
395 | mutex_unlock(&adev->physical_node_lock); | |
396 | return offline; | |
397 | } | |
398 | ||
7f28ddec RW |
399 | static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data, |
400 | void **ret_p) | |
683058e3 RW |
401 | { |
402 | struct acpi_device *device = NULL; | |
403 | struct acpi_device_physical_node *pn; | |
303bfdb1 | 404 | bool second_pass = (bool)data; |
683058e3 RW |
405 | acpi_status status = AE_OK; |
406 | ||
407 | if (acpi_bus_get_device(handle, &device)) | |
408 | return AE_OK; | |
409 | ||
7f28ddec RW |
410 | if (device->handler && !device->handler->hotplug.enabled) { |
411 | *ret_p = &device->dev; | |
412 | return AE_SUPPORT; | |
413 | } | |
414 | ||
683058e3 RW |
415 | mutex_lock(&device->physical_node_lock); |
416 | ||
417 | list_for_each_entry(pn, &device->physical_node_list, node) { | |
418 | int ret; | |
419 | ||
303bfdb1 RW |
420 | if (second_pass) { |
421 | /* Skip devices offlined by the first pass. */ | |
422 | if (pn->put_online) | |
423 | continue; | |
424 | } else { | |
425 | pn->put_online = false; | |
426 | } | |
683058e3 RW |
427 | ret = device_offline(pn->dev); |
428 | if (acpi_force_hot_remove) | |
429 | continue; | |
430 | ||
303bfdb1 RW |
431 | if (ret >= 0) { |
432 | pn->put_online = !ret; | |
433 | } else { | |
434 | *ret_p = pn->dev; | |
435 | if (second_pass) { | |
436 | status = AE_ERROR; | |
437 | break; | |
438 | } | |
683058e3 | 439 | } |
683058e3 RW |
440 | } |
441 | ||
442 | mutex_unlock(&device->physical_node_lock); | |
443 | ||
444 | return status; | |
445 | } | |
446 | ||
7f28ddec RW |
447 | static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data, |
448 | void **ret_p) | |
683058e3 RW |
449 | { |
450 | struct acpi_device *device = NULL; | |
451 | struct acpi_device_physical_node *pn; | |
452 | ||
453 | if (acpi_bus_get_device(handle, &device)) | |
454 | return AE_OK; | |
455 | ||
456 | mutex_lock(&device->physical_node_lock); | |
457 | ||
458 | list_for_each_entry(pn, &device->physical_node_list, node) | |
459 | if (pn->put_online) { | |
460 | device_online(pn->dev); | |
461 | pn->put_online = false; | |
462 | } | |
463 | ||
464 | mutex_unlock(&device->physical_node_lock); | |
465 | ||
466 | return AE_OK; | |
467 | } | |
468 | ||
d22ddcbc | 469 | static int acpi_scan_try_to_offline(struct acpi_device *device) |
1da177e4 | 470 | { |
5993c467 | 471 | acpi_handle handle = device->handle; |
d22ddcbc | 472 | struct device *errdev = NULL; |
a33ec399 | 473 | acpi_status status; |
f058cdf4 | 474 | |
303bfdb1 RW |
475 | /* |
476 | * Carry out two passes here and ignore errors in the first pass, | |
477 | * because if the devices in question are memory blocks and | |
478 | * CONFIG_MEMCG is set, one of the blocks may hold data structures | |
479 | * that the other blocks depend on, but it is not known in advance which | |
480 | * block holds them. | |
481 | * | |
482 | * If the first pass is successful, the second one isn't needed, though. | |
483 | */ | |
7f28ddec RW |
484 | status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
485 | NULL, acpi_bus_offline, (void *)false, | |
486 | (void **)&errdev); | |
487 | if (status == AE_SUPPORT) { | |
488 | dev_warn(errdev, "Offline disabled.\n"); | |
489 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
490 | acpi_bus_online, NULL, NULL, NULL); | |
7f28ddec RW |
491 | return -EPERM; |
492 | } | |
493 | acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev); | |
303bfdb1 RW |
494 | if (errdev) { |
495 | errdev = NULL; | |
683058e3 | 496 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
7f28ddec RW |
497 | NULL, acpi_bus_offline, (void *)true, |
498 | (void **)&errdev); | |
303bfdb1 | 499 | if (!errdev || acpi_force_hot_remove) |
7f28ddec RW |
500 | acpi_bus_offline(handle, 0, (void *)true, |
501 | (void **)&errdev); | |
303bfdb1 RW |
502 | |
503 | if (errdev && !acpi_force_hot_remove) { | |
504 | dev_warn(errdev, "Offline failed.\n"); | |
7f28ddec | 505 | acpi_bus_online(handle, 0, NULL, NULL); |
303bfdb1 | 506 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, |
7f28ddec RW |
507 | ACPI_UINT32_MAX, acpi_bus_online, |
508 | NULL, NULL, NULL); | |
303bfdb1 RW |
509 | return -EBUSY; |
510 | } | |
683058e3 | 511 | } |
d22ddcbc RW |
512 | return 0; |
513 | } | |
514 | ||
515 | static int acpi_scan_hot_remove(struct acpi_device *device) | |
516 | { | |
517 | acpi_handle handle = device->handle; | |
518 | unsigned long long sta; | |
519 | acpi_status status; | |
520 | ||
dee15926 TC |
521 | if (device->handler && device->handler->hotplug.demand_offline |
522 | && !acpi_force_hot_remove) { | |
caa73ea1 | 523 | if (!acpi_scan_is_offline(device, true)) |
d22ddcbc RW |
524 | return -EBUSY; |
525 | } else { | |
526 | int error = acpi_scan_try_to_offline(device); | |
527 | if (error) | |
528 | return error; | |
529 | } | |
683058e3 | 530 | |
26d46867 | 531 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
0794469d | 532 | "Hot-removing device %s...\n", dev_name(&device->dev))); |
26d46867 | 533 | |
bfee26db | 534 | acpi_bus_trim(device); |
683058e3 | 535 | |
7d2421f8 | 536 | acpi_evaluate_lck(handle, 0); |
1da177e4 LT |
537 | /* |
538 | * TBD: _EJD support. | |
539 | */ | |
7d2421f8 JL |
540 | status = acpi_evaluate_ej0(handle); |
541 | if (status == AE_NOT_FOUND) | |
542 | return -ENODEV; | |
543 | else if (ACPI_FAILURE(status)) | |
544 | return -EIO; | |
1da177e4 | 545 | |
882fd12e TK |
546 | /* |
547 | * Verify if eject was indeed successful. If not, log an error | |
548 | * message. No need to call _OST since _EJ0 call was made OK. | |
549 | */ | |
550 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
551 | if (ACPI_FAILURE(status)) { | |
552 | acpi_handle_warn(handle, | |
553 | "Status check after eject failed (0x%x)\n", status); | |
554 | } else if (sta & ACPI_STA_DEVICE_ENABLED) { | |
555 | acpi_handle_warn(handle, | |
556 | "Eject incomplete - status 0x%llx\n", sta); | |
557 | } | |
558 | ||
a33ec399 RW |
559 | return 0; |
560 | } | |
1da177e4 | 561 | |
443fc820 RW |
562 | static int acpi_scan_device_not_present(struct acpi_device *adev) |
563 | { | |
564 | if (!acpi_device_enumerated(adev)) { | |
565 | dev_warn(&adev->dev, "Still not present\n"); | |
566 | return -EALREADY; | |
567 | } | |
568 | acpi_bus_trim(adev); | |
569 | return 0; | |
570 | } | |
571 | ||
c27b2c33 | 572 | static int acpi_scan_device_check(struct acpi_device *adev) |
a33ec399 | 573 | { |
f943db40 | 574 | int error; |
a33ec399 | 575 | |
443fc820 RW |
576 | acpi_bus_get_status(adev); |
577 | if (adev->status.present || adev->status.functional) { | |
578 | /* | |
579 | * This function is only called for device objects for which | |
580 | * matching scan handlers exist. The only situation in which | |
581 | * the scan handler is not attached to this device object yet | |
582 | * is when the device has just appeared (either it wasn't | |
583 | * present at all before or it was removed and then added | |
584 | * again). | |
585 | */ | |
586 | if (adev->handler) { | |
587 | dev_warn(&adev->dev, "Already enumerated\n"); | |
588 | return -EALREADY; | |
589 | } | |
590 | error = acpi_bus_scan(adev->handle); | |
591 | if (error) { | |
592 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
593 | return error; | |
594 | } | |
595 | if (!adev->handler) { | |
596 | dev_warn(&adev->dev, "Enumeration failure\n"); | |
597 | error = -ENODEV; | |
598 | } | |
599 | } else { | |
600 | error = acpi_scan_device_not_present(adev); | |
601 | } | |
602 | return error; | |
603 | } | |
604 | ||
605 | static int acpi_scan_bus_check(struct acpi_device *adev) | |
606 | { | |
607 | struct acpi_scan_handler *handler = adev->handler; | |
608 | struct acpi_device *child; | |
609 | int error; | |
610 | ||
611 | acpi_bus_get_status(adev); | |
612 | if (!(adev->status.present || adev->status.functional)) { | |
613 | acpi_scan_device_not_present(adev); | |
614 | return 0; | |
615 | } | |
616 | if (handler && handler->hotplug.scan_dependent) | |
617 | return handler->hotplug.scan_dependent(adev); | |
618 | ||
c27b2c33 RW |
619 | error = acpi_bus_scan(adev->handle); |
620 | if (error) { | |
621 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
622 | return error; | |
623 | } | |
443fc820 RW |
624 | list_for_each_entry(child, &adev->children, node) { |
625 | error = acpi_scan_bus_check(child); | |
626 | if (error) | |
627 | return error; | |
c27b2c33 RW |
628 | } |
629 | return 0; | |
a33ec399 RW |
630 | } |
631 | ||
3c2cc7ff RW |
632 | static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type) |
633 | { | |
634 | switch (type) { | |
635 | case ACPI_NOTIFY_BUS_CHECK: | |
636 | return acpi_scan_bus_check(adev); | |
637 | case ACPI_NOTIFY_DEVICE_CHECK: | |
638 | return acpi_scan_device_check(adev); | |
639 | case ACPI_NOTIFY_EJECT_REQUEST: | |
640 | case ACPI_OST_EC_OSPM_EJECT: | |
dd2151be RW |
641 | if (adev->handler && !adev->handler->hotplug.enabled) { |
642 | dev_info(&adev->dev, "Eject disabled\n"); | |
643 | return -EPERM; | |
644 | } | |
700b8422 RW |
645 | acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST, |
646 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); | |
3c2cc7ff RW |
647 | return acpi_scan_hot_remove(adev); |
648 | } | |
649 | return -EINVAL; | |
650 | } | |
651 | ||
1e3bcb59 | 652 | void acpi_device_hotplug(struct acpi_device *adev, u32 src) |
a33ec399 | 653 | { |
a33ec399 | 654 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
3c2cc7ff | 655 | int error = -ENODEV; |
a33ec399 | 656 | |
683058e3 | 657 | lock_device_hotplug(); |
e0ae8fee | 658 | mutex_lock(&acpi_scan_lock); |
a33ec399 | 659 | |
c27b2c33 RW |
660 | /* |
661 | * The device object's ACPI handle cannot become invalid as long as we | |
3c2cc7ff | 662 | * are holding acpi_scan_lock, but it might have become invalid before |
c27b2c33 RW |
663 | * that lock was acquired. |
664 | */ | |
665 | if (adev->handle == INVALID_ACPI_HANDLE) | |
3c2cc7ff | 666 | goto err_out; |
c27b2c33 | 667 | |
1e2380cd RW |
668 | if (adev->flags.is_dock_station) { |
669 | error = dock_notify(adev, src); | |
670 | } else if (adev->flags.hotplug_notify) { | |
3c2cc7ff | 671 | error = acpi_generic_hotplug_event(adev, src); |
dd2151be RW |
672 | if (error == -EPERM) { |
673 | ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; | |
674 | goto err_out; | |
675 | } | |
3c2cc7ff | 676 | } else { |
be27b3dc | 677 | int (*notify)(struct acpi_device *, u32); |
3c2cc7ff RW |
678 | |
679 | acpi_lock_hp_context(); | |
be27b3dc | 680 | notify = adev->hp ? adev->hp->notify : NULL; |
3c2cc7ff RW |
681 | acpi_unlock_hp_context(); |
682 | /* | |
683 | * There may be additional notify handlers for device objects | |
684 | * without the .event() callback, so ignore them here. | |
685 | */ | |
be27b3dc RW |
686 | if (notify) |
687 | error = notify(adev, src); | |
3c2cc7ff RW |
688 | else |
689 | goto out; | |
a33ec399 | 690 | } |
c27b2c33 RW |
691 | if (!error) |
692 | ost_code = ACPI_OST_SC_SUCCESS; | |
a33ec399 | 693 | |
3c2cc7ff | 694 | err_out: |
700b8422 | 695 | acpi_evaluate_ost(adev->handle, src, ost_code, NULL); |
3c2cc7ff RW |
696 | |
697 | out: | |
78ea4639 | 698 | acpi_bus_put_acpi_device(adev); |
a33ec399 | 699 | mutex_unlock(&acpi_scan_lock); |
e0ae8fee | 700 | unlock_device_hotplug(); |
a33ec399 RW |
701 | } |
702 | ||
836aedb1 RW |
703 | static ssize_t real_power_state_show(struct device *dev, |
704 | struct device_attribute *attr, char *buf) | |
705 | { | |
706 | struct acpi_device *adev = to_acpi_device(dev); | |
707 | int state; | |
708 | int ret; | |
709 | ||
710 | ret = acpi_device_get_power(adev, &state); | |
711 | if (ret) | |
712 | return ret; | |
713 | ||
714 | return sprintf(buf, "%s\n", acpi_power_state_string(state)); | |
715 | } | |
716 | ||
717 | static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL); | |
718 | ||
719 | static ssize_t power_state_show(struct device *dev, | |
720 | struct device_attribute *attr, char *buf) | |
721 | { | |
722 | struct acpi_device *adev = to_acpi_device(dev); | |
723 | ||
724 | return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state)); | |
725 | } | |
726 | ||
727 | static DEVICE_ATTR(power_state, 0444, power_state_show, NULL); | |
728 | ||
1da177e4 | 729 | static ssize_t |
f883d9db PM |
730 | acpi_eject_store(struct device *d, struct device_attribute *attr, |
731 | const char *buf, size_t count) | |
1da177e4 | 732 | { |
f883d9db | 733 | struct acpi_device *acpi_device = to_acpi_device(d); |
a33ec399 RW |
734 | acpi_object_type not_used; |
735 | acpi_status status; | |
1da177e4 | 736 | |
a33ec399 | 737 | if (!count || buf[0] != '1') |
1da177e4 | 738 | return -EINVAL; |
1da177e4 | 739 | |
a33ec399 RW |
740 | if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled) |
741 | && !acpi_device->driver) | |
742 | return -ENODEV; | |
743 | ||
744 | status = acpi_get_type(acpi_device->handle, ¬_used); | |
745 | if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable) | |
746 | return -ENODEV; | |
747 | ||
a33ec399 | 748 | get_device(&acpi_device->dev); |
1e3bcb59 | 749 | status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT); |
f943db40 RW |
750 | if (ACPI_SUCCESS(status)) |
751 | return count; | |
a33ec399 | 752 | |
f943db40 | 753 | put_device(&acpi_device->dev); |
700b8422 RW |
754 | acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, |
755 | ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); | |
5add99cf | 756 | return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN; |
1da177e4 LT |
757 | } |
758 | ||
f883d9db | 759 | static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); |
1da177e4 | 760 | |
e49bd2dd ZR |
761 | static ssize_t |
762 | acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
763 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
1da177e4 | 764 | |
ea8d82fd | 765 | return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev)); |
1da177e4 | 766 | } |
e49bd2dd | 767 | static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL); |
1da177e4 | 768 | |
923d4a45 LZ |
769 | static ssize_t acpi_device_uid_show(struct device *dev, |
770 | struct device_attribute *attr, char *buf) | |
771 | { | |
772 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
773 | ||
774 | return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id); | |
775 | } | |
776 | static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL); | |
777 | ||
778 | static ssize_t acpi_device_adr_show(struct device *dev, | |
779 | struct device_attribute *attr, char *buf) | |
780 | { | |
781 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
782 | ||
783 | return sprintf(buf, "0x%08x\n", | |
784 | (unsigned int)(acpi_dev->pnp.bus_address)); | |
785 | } | |
786 | static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL); | |
787 | ||
e49bd2dd ZR |
788 | static ssize_t |
789 | acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
790 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
791 | struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; | |
792 | int result; | |
1da177e4 | 793 | |
e49bd2dd | 794 | result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path); |
0c526d96 | 795 | if (result) |
e49bd2dd | 796 | goto end; |
1da177e4 | 797 | |
e49bd2dd ZR |
798 | result = sprintf(buf, "%s\n", (char*)path.pointer); |
799 | kfree(path.pointer); | |
0c526d96 | 800 | end: |
e49bd2dd | 801 | return result; |
1da177e4 | 802 | } |
e49bd2dd | 803 | static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL); |
1da177e4 | 804 | |
d1efe3c3 LO |
805 | /* sysfs file that shows description text from the ACPI _STR method */ |
806 | static ssize_t description_show(struct device *dev, | |
807 | struct device_attribute *attr, | |
808 | char *buf) { | |
809 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
810 | int result; | |
811 | ||
812 | if (acpi_dev->pnp.str_obj == NULL) | |
813 | return 0; | |
814 | ||
815 | /* | |
816 | * The _STR object contains a Unicode identifier for a device. | |
817 | * We need to convert to utf-8 so it can be displayed. | |
818 | */ | |
819 | result = utf16s_to_utf8s( | |
820 | (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer, | |
821 | acpi_dev->pnp.str_obj->buffer.length, | |
822 | UTF16_LITTLE_ENDIAN, buf, | |
823 | PAGE_SIZE); | |
824 | ||
825 | buf[result++] = '\n'; | |
826 | ||
827 | return result; | |
828 | } | |
829 | static DEVICE_ATTR(description, 0444, description_show, NULL); | |
830 | ||
bb74ac23 YI |
831 | static ssize_t |
832 | acpi_device_sun_show(struct device *dev, struct device_attribute *attr, | |
833 | char *buf) { | |
834 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
a383b68d YI |
835 | acpi_status status; |
836 | unsigned long long sun; | |
bb74ac23 | 837 | |
a383b68d YI |
838 | status = acpi_evaluate_integer(acpi_dev->handle, "_SUN", NULL, &sun); |
839 | if (ACPI_FAILURE(status)) | |
840 | return -ENODEV; | |
841 | ||
842 | return sprintf(buf, "%llu\n", sun); | |
bb74ac23 YI |
843 | } |
844 | static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL); | |
845 | ||
c713cd7f SP |
846 | static ssize_t status_show(struct device *dev, struct device_attribute *attr, |
847 | char *buf) { | |
848 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
849 | acpi_status status; | |
850 | unsigned long long sta; | |
851 | ||
852 | status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta); | |
853 | if (ACPI_FAILURE(status)) | |
854 | return -ENODEV; | |
855 | ||
856 | return sprintf(buf, "%llu\n", sta); | |
857 | } | |
858 | static DEVICE_ATTR_RO(status); | |
859 | ||
e49bd2dd | 860 | static int acpi_device_setup_files(struct acpi_device *dev) |
1da177e4 | 861 | { |
d1efe3c3 | 862 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
f883d9db | 863 | acpi_status status; |
e49bd2dd | 864 | int result = 0; |
1da177e4 LT |
865 | |
866 | /* | |
e49bd2dd | 867 | * Devices gotten from FADT don't have a "path" attribute |
1da177e4 | 868 | */ |
0c526d96 | 869 | if (dev->handle) { |
e49bd2dd | 870 | result = device_create_file(&dev->dev, &dev_attr_path); |
0c526d96 | 871 | if (result) |
e49bd2dd | 872 | goto end; |
1da177e4 LT |
873 | } |
874 | ||
2b2ae7c7 TR |
875 | if (!list_empty(&dev->pnp.ids)) { |
876 | result = device_create_file(&dev->dev, &dev_attr_hid); | |
877 | if (result) | |
878 | goto end; | |
1da177e4 | 879 | |
2b2ae7c7 TR |
880 | result = device_create_file(&dev->dev, &dev_attr_modalias); |
881 | if (result) | |
882 | goto end; | |
883 | } | |
29b71a1c | 884 | |
d1efe3c3 LO |
885 | /* |
886 | * If device has _STR, 'description' file is created | |
887 | */ | |
952c63e9 | 888 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
889 | status = acpi_evaluate_object(dev->handle, "_STR", |
890 | NULL, &buffer); | |
891 | if (ACPI_FAILURE(status)) | |
892 | buffer.pointer = NULL; | |
893 | dev->pnp.str_obj = buffer.pointer; | |
894 | result = device_create_file(&dev->dev, &dev_attr_description); | |
895 | if (result) | |
896 | goto end; | |
897 | } | |
898 | ||
d4e1a692 | 899 | if (dev->pnp.type.bus_address) |
923d4a45 LZ |
900 | result = device_create_file(&dev->dev, &dev_attr_adr); |
901 | if (dev->pnp.unique_id) | |
902 | result = device_create_file(&dev->dev, &dev_attr_uid); | |
903 | ||
a383b68d | 904 | if (acpi_has_method(dev->handle, "_SUN")) { |
bb74ac23 YI |
905 | result = device_create_file(&dev->dev, &dev_attr_sun); |
906 | if (result) | |
907 | goto end; | |
bb74ac23 YI |
908 | } |
909 | ||
c713cd7f SP |
910 | if (acpi_has_method(dev->handle, "_STA")) { |
911 | result = device_create_file(&dev->dev, &dev_attr_status); | |
912 | if (result) | |
913 | goto end; | |
914 | } | |
915 | ||
e49bd2dd ZR |
916 | /* |
917 | * If device has _EJ0, 'eject' file is created that is used to trigger | |
918 | * hot-removal function from userland. | |
919 | */ | |
952c63e9 | 920 | if (acpi_has_method(dev->handle, "_EJ0")) { |
e49bd2dd | 921 | result = device_create_file(&dev->dev, &dev_attr_eject); |
836aedb1 RW |
922 | if (result) |
923 | return result; | |
924 | } | |
925 | ||
926 | if (dev->flags.power_manageable) { | |
927 | result = device_create_file(&dev->dev, &dev_attr_power_state); | |
928 | if (result) | |
929 | return result; | |
930 | ||
931 | if (dev->power.flags.power_resources) | |
932 | result = device_create_file(&dev->dev, | |
933 | &dev_attr_real_power_state); | |
934 | } | |
935 | ||
0c526d96 | 936 | end: |
e49bd2dd | 937 | return result; |
1da177e4 LT |
938 | } |
939 | ||
f883d9db | 940 | static void acpi_device_remove_files(struct acpi_device *dev) |
1da177e4 | 941 | { |
836aedb1 RW |
942 | if (dev->flags.power_manageable) { |
943 | device_remove_file(&dev->dev, &dev_attr_power_state); | |
944 | if (dev->power.flags.power_resources) | |
945 | device_remove_file(&dev->dev, | |
946 | &dev_attr_real_power_state); | |
947 | } | |
948 | ||
f883d9db | 949 | /* |
d1efe3c3 LO |
950 | * If device has _STR, remove 'description' file |
951 | */ | |
952c63e9 | 952 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
953 | kfree(dev->pnp.str_obj); |
954 | device_remove_file(&dev->dev, &dev_attr_description); | |
955 | } | |
956 | /* | |
957 | * If device has _EJ0, remove 'eject' file. | |
f883d9db | 958 | */ |
952c63e9 | 959 | if (acpi_has_method(dev->handle, "_EJ0")) |
f883d9db | 960 | device_remove_file(&dev->dev, &dev_attr_eject); |
1da177e4 | 961 | |
952c63e9 | 962 | if (acpi_has_method(dev->handle, "_SUN")) |
bb74ac23 YI |
963 | device_remove_file(&dev->dev, &dev_attr_sun); |
964 | ||
923d4a45 LZ |
965 | if (dev->pnp.unique_id) |
966 | device_remove_file(&dev->dev, &dev_attr_uid); | |
d4e1a692 | 967 | if (dev->pnp.type.bus_address) |
923d4a45 | 968 | device_remove_file(&dev->dev, &dev_attr_adr); |
1131b938 BH |
969 | device_remove_file(&dev->dev, &dev_attr_modalias); |
970 | device_remove_file(&dev->dev, &dev_attr_hid); | |
c713cd7f SP |
971 | if (acpi_has_method(dev->handle, "_STA")) |
972 | device_remove_file(&dev->dev, &dev_attr_status); | |
0c526d96 | 973 | if (dev->handle) |
e49bd2dd | 974 | device_remove_file(&dev->dev, &dev_attr_path); |
1da177e4 | 975 | } |
1da177e4 | 976 | /* -------------------------------------------------------------------------- |
9e89dde2 | 977 | ACPI Bus operations |
1da177e4 | 978 | -------------------------------------------------------------------------- */ |
29b71a1c | 979 | |
2b9c698e RW |
980 | /** |
981 | * acpi_of_match_device - Match device object using the "compatible" property. | |
982 | * @adev: ACPI device object to match. | |
983 | * @of_match_table: List of device IDs to match against. | |
984 | * | |
ee892094 RW |
985 | * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of |
986 | * identifiers and a _DSD object with the "compatible" property, use that | |
987 | * property to match against the given list of identifiers. | |
2b9c698e RW |
988 | */ |
989 | static bool acpi_of_match_device(struct acpi_device *adev, | |
990 | const struct of_device_id *of_match_table) | |
991 | { | |
992 | const union acpi_object *of_compatible, *obj; | |
993 | int i, nval; | |
994 | ||
995 | if (!adev) | |
996 | return false; | |
997 | ||
998 | of_compatible = adev->data.of_compatible; | |
999 | if (!of_match_table || !of_compatible) | |
1000 | return false; | |
1001 | ||
1002 | if (of_compatible->type == ACPI_TYPE_PACKAGE) { | |
1003 | nval = of_compatible->package.count; | |
1004 | obj = of_compatible->package.elements; | |
1005 | } else { /* Must be ACPI_TYPE_STRING. */ | |
1006 | nval = 1; | |
1007 | obj = of_compatible; | |
1008 | } | |
1009 | /* Now we can look for the driver DT compatible strings */ | |
1010 | for (i = 0; i < nval; i++, obj++) { | |
1011 | const struct of_device_id *id; | |
1012 | ||
1013 | for (id = of_match_table; id->compatible[0]; id++) | |
1014 | if (!strcasecmp(obj->string.pointer, id->compatible)) | |
1015 | return true; | |
1016 | } | |
1017 | ||
1018 | return false; | |
1019 | } | |
1020 | ||
cf761af9 | 1021 | static const struct acpi_device_id *__acpi_match_device( |
2b9c698e RW |
1022 | struct acpi_device *device, |
1023 | const struct acpi_device_id *ids, | |
1024 | const struct of_device_id *of_ids) | |
29b71a1c TR |
1025 | { |
1026 | const struct acpi_device_id *id; | |
7f47fa6c | 1027 | struct acpi_hardware_id *hwid; |
29b71a1c | 1028 | |
39a0ad87 ZY |
1029 | /* |
1030 | * If the device is not present, it is unnecessary to load device | |
1031 | * driver for it. | |
1032 | */ | |
e1acdeb0 | 1033 | if (!device || !device->status.present) |
cf761af9 | 1034 | return NULL; |
39a0ad87 | 1035 | |
2b9c698e RW |
1036 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
1037 | /* First, check the ACPI/PNP IDs provided by the caller. */ | |
1038 | for (id = ids; id->id[0]; id++) | |
7f47fa6c | 1039 | if (!strcmp((char *) id->id, hwid->id)) |
cf761af9 MW |
1040 | return id; |
1041 | ||
2b9c698e | 1042 | /* |
ee892094 | 1043 | * Next, check ACPI_DT_NAMESPACE_HID and try to match the |
2b9c698e RW |
1044 | * "compatible" property if found. |
1045 | * | |
1046 | * The id returned by the below is not valid, but the only | |
1047 | * caller passing non-NULL of_ids here is only interested in | |
1048 | * whether or not the return value is NULL. | |
1049 | */ | |
ee892094 | 1050 | if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id) |
2b9c698e RW |
1051 | && acpi_of_match_device(device, of_ids)) |
1052 | return id; | |
1053 | } | |
cf761af9 MW |
1054 | return NULL; |
1055 | } | |
1056 | ||
1057 | /** | |
1058 | * acpi_match_device - Match a struct device against a given list of ACPI IDs | |
1059 | * @ids: Array of struct acpi_device_id object to match against. | |
1060 | * @dev: The device structure to match. | |
1061 | * | |
1062 | * Check if @dev has a valid ACPI handle and if there is a struct acpi_device | |
1063 | * object for that handle and use that object to match against a given list of | |
1064 | * device IDs. | |
1065 | * | |
1066 | * Return a pointer to the first matching ID on success or %NULL on failure. | |
1067 | */ | |
1068 | const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, | |
1069 | const struct device *dev) | |
1070 | { | |
2b9c698e | 1071 | return __acpi_match_device(acpi_companion_match(dev), ids, NULL); |
cf761af9 MW |
1072 | } |
1073 | EXPORT_SYMBOL_GPL(acpi_match_device); | |
29b71a1c | 1074 | |
cf761af9 MW |
1075 | int acpi_match_device_ids(struct acpi_device *device, |
1076 | const struct acpi_device_id *ids) | |
1077 | { | |
2b9c698e | 1078 | return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT; |
29b71a1c TR |
1079 | } |
1080 | EXPORT_SYMBOL(acpi_match_device_ids); | |
1081 | ||
733e6251 MW |
1082 | bool acpi_driver_match_device(struct device *dev, |
1083 | const struct device_driver *drv) | |
1084 | { | |
1085 | if (!drv->acpi_match_table) | |
2b9c698e RW |
1086 | return acpi_of_match_device(ACPI_COMPANION(dev), |
1087 | drv->of_match_table); | |
733e6251 | 1088 | |
2b9c698e RW |
1089 | return !!__acpi_match_device(acpi_companion_match(dev), |
1090 | drv->acpi_match_table, drv->of_match_table); | |
733e6251 MW |
1091 | } |
1092 | EXPORT_SYMBOL_GPL(acpi_driver_match_device); | |
1093 | ||
0b224527 RW |
1094 | static void acpi_free_power_resources_lists(struct acpi_device *device) |
1095 | { | |
1096 | int i; | |
1097 | ||
993cbe59 RW |
1098 | if (device->wakeup.flags.valid) |
1099 | acpi_power_resources_list_free(&device->wakeup.resources); | |
1100 | ||
1b1f3e16 | 1101 | if (!device->power.flags.power_resources) |
0b224527 RW |
1102 | return; |
1103 | ||
1104 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { | |
1105 | struct acpi_device_power_state *ps = &device->power.states[i]; | |
1106 | acpi_power_resources_list_free(&ps->resources); | |
1107 | } | |
7f47fa6c BH |
1108 | } |
1109 | ||
1890a97a | 1110 | static void acpi_device_release(struct device *dev) |
1da177e4 | 1111 | { |
1890a97a | 1112 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1da177e4 | 1113 | |
ffdcd955 | 1114 | acpi_free_properties(acpi_dev); |
c0af4175 | 1115 | acpi_free_pnp_ids(&acpi_dev->pnp); |
0b224527 | 1116 | acpi_free_power_resources_lists(acpi_dev); |
1890a97a | 1117 | kfree(acpi_dev); |
1da177e4 LT |
1118 | } |
1119 | ||
5d9464a4 | 1120 | static int acpi_bus_match(struct device *dev, struct device_driver *drv) |
9e89dde2 | 1121 | { |
5d9464a4 PM |
1122 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1123 | struct acpi_driver *acpi_drv = to_acpi_driver(drv); | |
1da177e4 | 1124 | |
209d3b17 | 1125 | return acpi_dev->flags.match_driver |
805d410f | 1126 | && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); |
5d9464a4 | 1127 | } |
1da177e4 | 1128 | |
7eff2e7a | 1129 | static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 | 1130 | { |
8765c5ba | 1131 | return __acpi_device_uevent_modalias(to_acpi_device(dev), env); |
1da177e4 LT |
1132 | } |
1133 | ||
46ec8598 BH |
1134 | static void acpi_device_notify(acpi_handle handle, u32 event, void *data) |
1135 | { | |
1136 | struct acpi_device *device = data; | |
1137 | ||
1138 | device->driver->ops.notify(device, event); | |
1139 | } | |
1140 | ||
236105db | 1141 | static void acpi_device_notify_fixed(void *data) |
46ec8598 BH |
1142 | { |
1143 | struct acpi_device *device = data; | |
1144 | ||
53de5356 BH |
1145 | /* Fixed hardware devices have no handles */ |
1146 | acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); | |
236105db LT |
1147 | } |
1148 | ||
fd9caef4 | 1149 | static u32 acpi_device_fixed_event(void *data) |
236105db LT |
1150 | { |
1151 | acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data); | |
fd9caef4 | 1152 | return ACPI_INTERRUPT_HANDLED; |
46ec8598 BH |
1153 | } |
1154 | ||
1155 | static int acpi_device_install_notify_handler(struct acpi_device *device) | |
1156 | { | |
1157 | acpi_status status; | |
46ec8598 | 1158 | |
ccba2a36 | 1159 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 BH |
1160 | status = |
1161 | acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, | |
236105db | 1162 | acpi_device_fixed_event, |
46ec8598 | 1163 | device); |
ccba2a36 | 1164 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 BH |
1165 | status = |
1166 | acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, | |
236105db | 1167 | acpi_device_fixed_event, |
46ec8598 BH |
1168 | device); |
1169 | else | |
1170 | status = acpi_install_notify_handler(device->handle, | |
1171 | ACPI_DEVICE_NOTIFY, | |
1172 | acpi_device_notify, | |
1173 | device); | |
1174 | ||
1175 | if (ACPI_FAILURE(status)) | |
1176 | return -EINVAL; | |
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | static void acpi_device_remove_notify_handler(struct acpi_device *device) | |
1181 | { | |
ccba2a36 | 1182 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 | 1183 | acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, |
236105db | 1184 | acpi_device_fixed_event); |
ccba2a36 | 1185 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 | 1186 | acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, |
236105db | 1187 | acpi_device_fixed_event); |
46ec8598 BH |
1188 | else |
1189 | acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, | |
1190 | acpi_device_notify); | |
1191 | } | |
1192 | ||
d9e455f5 | 1193 | static int acpi_device_probe(struct device *dev) |
1da177e4 | 1194 | { |
5d9464a4 PM |
1195 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1196 | struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); | |
1197 | int ret; | |
1198 | ||
fc2e0a83 | 1199 | if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) |
24071f47 RW |
1200 | return -EINVAL; |
1201 | ||
d9e455f5 RW |
1202 | if (!acpi_drv->ops.add) |
1203 | return -ENOSYS; | |
46ec8598 | 1204 | |
d9e455f5 RW |
1205 | ret = acpi_drv->ops.add(acpi_dev); |
1206 | if (ret) | |
1207 | return ret; | |
46ec8598 | 1208 | |
d9e455f5 RW |
1209 | acpi_dev->driver = acpi_drv; |
1210 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
1211 | "Driver [%s] successfully bound to device [%s]\n", | |
1212 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
1213 | ||
1214 | if (acpi_drv->ops.notify) { | |
1215 | ret = acpi_device_install_notify_handler(acpi_dev); | |
1216 | if (ret) { | |
1217 | if (acpi_drv->ops.remove) | |
1218 | acpi_drv->ops.remove(acpi_dev); | |
1219 | ||
1220 | acpi_dev->driver = NULL; | |
1221 | acpi_dev->driver_data = NULL; | |
1222 | return ret; | |
1223 | } | |
5d9464a4 | 1224 | } |
d9e455f5 RW |
1225 | |
1226 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n", | |
1227 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
1228 | get_device(dev); | |
1229 | return 0; | |
5d9464a4 | 1230 | } |
1da177e4 | 1231 | |
5d9464a4 PM |
1232 | static int acpi_device_remove(struct device * dev) |
1233 | { | |
1234 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
1235 | struct acpi_driver *acpi_drv = acpi_dev->driver; | |
1236 | ||
1237 | if (acpi_drv) { | |
46ec8598 BH |
1238 | if (acpi_drv->ops.notify) |
1239 | acpi_device_remove_notify_handler(acpi_dev); | |
5d9464a4 | 1240 | if (acpi_drv->ops.remove) |
51fac838 | 1241 | acpi_drv->ops.remove(acpi_dev); |
1da177e4 | 1242 | } |
5d9464a4 | 1243 | acpi_dev->driver = NULL; |
db89b4f0 | 1244 | acpi_dev->driver_data = NULL; |
1da177e4 | 1245 | |
5d9464a4 | 1246 | put_device(dev); |
9e89dde2 ZR |
1247 | return 0; |
1248 | } | |
1da177e4 | 1249 | |
55955aad | 1250 | struct bus_type acpi_bus_type = { |
9e89dde2 | 1251 | .name = "acpi", |
5d9464a4 PM |
1252 | .match = acpi_bus_match, |
1253 | .probe = acpi_device_probe, | |
1254 | .remove = acpi_device_remove, | |
1255 | .uevent = acpi_device_uevent, | |
9e89dde2 ZR |
1256 | }; |
1257 | ||
d783156e RW |
1258 | static void acpi_device_del(struct acpi_device *device) |
1259 | { | |
1260 | mutex_lock(&acpi_device_lock); | |
1261 | if (device->parent) | |
1262 | list_del(&device->node); | |
1263 | ||
1264 | list_del(&device->wakeup_list); | |
1265 | mutex_unlock(&acpi_device_lock); | |
1266 | ||
1267 | acpi_power_add_remove_device(device, false); | |
1268 | acpi_device_remove_files(device); | |
1269 | if (device->remove) | |
1270 | device->remove(device); | |
1271 | ||
1272 | device_del(&device->dev); | |
1273 | } | |
1274 | ||
1275 | static LIST_HEAD(acpi_device_del_list); | |
1276 | static DEFINE_MUTEX(acpi_device_del_lock); | |
1277 | ||
1278 | static void acpi_device_del_work_fn(struct work_struct *work_not_used) | |
1279 | { | |
1280 | for (;;) { | |
1281 | struct acpi_device *adev; | |
1282 | ||
1283 | mutex_lock(&acpi_device_del_lock); | |
1284 | ||
1285 | if (list_empty(&acpi_device_del_list)) { | |
1286 | mutex_unlock(&acpi_device_del_lock); | |
1287 | break; | |
1288 | } | |
1289 | adev = list_first_entry(&acpi_device_del_list, | |
1290 | struct acpi_device, del_list); | |
1291 | list_del(&adev->del_list); | |
1292 | ||
1293 | mutex_unlock(&acpi_device_del_lock); | |
1294 | ||
1295 | acpi_device_del(adev); | |
1296 | /* | |
1297 | * Drop references to all power resources that might have been | |
1298 | * used by the device. | |
1299 | */ | |
1300 | acpi_power_transition(adev, ACPI_STATE_D3_COLD); | |
1301 | put_device(&adev->dev); | |
1302 | } | |
1303 | } | |
1304 | ||
1305 | /** | |
1306 | * acpi_scan_drop_device - Drop an ACPI device object. | |
1307 | * @handle: Handle of an ACPI namespace node, not used. | |
1308 | * @context: Address of the ACPI device object to drop. | |
1309 | * | |
1310 | * This is invoked by acpi_ns_delete_node() during the removal of the ACPI | |
1311 | * namespace node the device object pointed to by @context is attached to. | |
1312 | * | |
1313 | * The unregistration is carried out asynchronously to avoid running | |
1314 | * acpi_device_del() under the ACPICA's namespace mutex and the list is used to | |
1315 | * ensure the correct ordering (the device objects must be unregistered in the | |
1316 | * same order in which the corresponding namespace nodes are deleted). | |
1317 | */ | |
1318 | static void acpi_scan_drop_device(acpi_handle handle, void *context) | |
caf5c03f | 1319 | { |
d783156e RW |
1320 | static DECLARE_WORK(work, acpi_device_del_work_fn); |
1321 | struct acpi_device *adev = context; | |
1322 | ||
1323 | mutex_lock(&acpi_device_del_lock); | |
1324 | ||
1325 | /* | |
1326 | * Use the ACPI hotplug workqueue which is ordered, so this work item | |
1327 | * won't run after any hotplug work items submitted subsequently. That | |
1328 | * prevents attempts to register device objects identical to those being | |
1329 | * deleted from happening concurrently (such attempts result from | |
1330 | * hotplug events handled via the ACPI hotplug workqueue). It also will | |
1331 | * run after all of the work items submitted previosuly, which helps | |
1332 | * those work items to ensure that they are not accessing stale device | |
1333 | * objects. | |
1334 | */ | |
1335 | if (list_empty(&acpi_device_del_list)) | |
1336 | acpi_queue_hotplug_work(&work); | |
1337 | ||
1338 | list_add_tail(&adev->del_list, &acpi_device_del_list); | |
1339 | /* Make acpi_ns_validate_handle() return NULL for this handle. */ | |
1340 | adev->handle = INVALID_ACPI_HANDLE; | |
1341 | ||
1342 | mutex_unlock(&acpi_device_del_lock); | |
caf5c03f RW |
1343 | } |
1344 | ||
78ea4639 RW |
1345 | static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device, |
1346 | void (*callback)(void *)) | |
caf5c03f RW |
1347 | { |
1348 | acpi_status status; | |
1349 | ||
1350 | if (!device) | |
1351 | return -EINVAL; | |
1352 | ||
78ea4639 RW |
1353 | status = acpi_get_data_full(handle, acpi_scan_drop_device, |
1354 | (void **)device, callback); | |
caf5c03f RW |
1355 | if (ACPI_FAILURE(status) || !*device) { |
1356 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", | |
1357 | handle)); | |
1358 | return -ENODEV; | |
1359 | } | |
1360 | return 0; | |
1361 | } | |
78ea4639 RW |
1362 | |
1363 | int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) | |
1364 | { | |
1365 | return acpi_get_device_data(handle, device, NULL); | |
1366 | } | |
6585925b | 1367 | EXPORT_SYMBOL(acpi_bus_get_device); |
caf5c03f | 1368 | |
78ea4639 RW |
1369 | static void get_acpi_device(void *dev) |
1370 | { | |
1371 | if (dev) | |
1372 | get_device(&((struct acpi_device *)dev)->dev); | |
1373 | } | |
1374 | ||
1375 | struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle) | |
1376 | { | |
1377 | struct acpi_device *adev = NULL; | |
1378 | ||
1379 | acpi_get_device_data(handle, &adev, get_acpi_device); | |
1380 | return adev; | |
1381 | } | |
1382 | ||
1383 | void acpi_bus_put_acpi_device(struct acpi_device *adev) | |
1384 | { | |
1385 | put_device(&adev->dev); | |
1386 | } | |
1387 | ||
cf860be6 RW |
1388 | int acpi_device_add(struct acpi_device *device, |
1389 | void (*release)(struct device *)) | |
1da177e4 | 1390 | { |
4be44fcd | 1391 | int result; |
e49bd2dd ZR |
1392 | struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; |
1393 | int found = 0; | |
66b7ed40 | 1394 | |
d43e167d RW |
1395 | if (device->handle) { |
1396 | acpi_status status; | |
1397 | ||
d783156e | 1398 | status = acpi_attach_data(device->handle, acpi_scan_drop_device, |
d43e167d RW |
1399 | device); |
1400 | if (ACPI_FAILURE(status)) { | |
1401 | acpi_handle_err(device->handle, | |
1402 | "Unable to attach device data\n"); | |
1403 | return -ENODEV; | |
1404 | } | |
1405 | } | |
1406 | ||
9e89dde2 ZR |
1407 | /* |
1408 | * Linkage | |
1409 | * ------- | |
1410 | * Link this device to its parent and siblings. | |
1411 | */ | |
1412 | INIT_LIST_HEAD(&device->children); | |
1413 | INIT_LIST_HEAD(&device->node); | |
9e89dde2 | 1414 | INIT_LIST_HEAD(&device->wakeup_list); |
1033f904 | 1415 | INIT_LIST_HEAD(&device->physical_node_list); |
d783156e | 1416 | INIT_LIST_HEAD(&device->del_list); |
1033f904 | 1417 | mutex_init(&device->physical_node_lock); |
1da177e4 | 1418 | |
e49bd2dd ZR |
1419 | new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); |
1420 | if (!new_bus_id) { | |
d43e167d RW |
1421 | pr_err(PREFIX "Memory allocation error\n"); |
1422 | result = -ENOMEM; | |
1423 | goto err_detach; | |
1da177e4 | 1424 | } |
e49bd2dd | 1425 | |
9090589d | 1426 | mutex_lock(&acpi_device_lock); |
e49bd2dd ZR |
1427 | /* |
1428 | * Find suitable bus_id and instance number in acpi_bus_id_list | |
1429 | * If failed, create one and link it into acpi_bus_id_list | |
1430 | */ | |
1431 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { | |
1131b938 BH |
1432 | if (!strcmp(acpi_device_bus_id->bus_id, |
1433 | acpi_device_hid(device))) { | |
1434 | acpi_device_bus_id->instance_no++; | |
e49bd2dd ZR |
1435 | found = 1; |
1436 | kfree(new_bus_id); | |
1437 | break; | |
1438 | } | |
1da177e4 | 1439 | } |
0c526d96 | 1440 | if (!found) { |
e49bd2dd | 1441 | acpi_device_bus_id = new_bus_id; |
1131b938 | 1442 | strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); |
e49bd2dd ZR |
1443 | acpi_device_bus_id->instance_no = 0; |
1444 | list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); | |
1da177e4 | 1445 | } |
0794469d | 1446 | dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); |
1da177e4 | 1447 | |
33b57150 | 1448 | if (device->parent) |
9e89dde2 | 1449 | list_add_tail(&device->node, &device->parent->children); |
33b57150 | 1450 | |
9e89dde2 ZR |
1451 | if (device->wakeup.flags.valid) |
1452 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); | |
9090589d | 1453 | mutex_unlock(&acpi_device_lock); |
1da177e4 | 1454 | |
1890a97a | 1455 | if (device->parent) |
66b7ed40 | 1456 | device->dev.parent = &device->parent->dev; |
1890a97a | 1457 | device->dev.bus = &acpi_bus_type; |
82c7d5ef | 1458 | device->dev.release = release; |
cf860be6 | 1459 | result = device_add(&device->dev); |
0c526d96 | 1460 | if (result) { |
8b12b922 | 1461 | dev_err(&device->dev, "Error registering device\n"); |
d43e167d | 1462 | goto err; |
1da177e4 | 1463 | } |
1da177e4 | 1464 | |
e49bd2dd | 1465 | result = acpi_device_setup_files(device); |
0c526d96 | 1466 | if (result) |
0794469d KS |
1467 | printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", |
1468 | dev_name(&device->dev)); | |
1da177e4 | 1469 | |
1da177e4 | 1470 | return 0; |
d43e167d RW |
1471 | |
1472 | err: | |
9090589d | 1473 | mutex_lock(&acpi_device_lock); |
33b57150 | 1474 | if (device->parent) |
e49bd2dd | 1475 | list_del(&device->node); |
e49bd2dd | 1476 | list_del(&device->wakeup_list); |
9090589d | 1477 | mutex_unlock(&acpi_device_lock); |
d43e167d RW |
1478 | |
1479 | err_detach: | |
d783156e | 1480 | acpi_detach_data(device->handle, acpi_scan_drop_device); |
e49bd2dd | 1481 | return result; |
1da177e4 LT |
1482 | } |
1483 | ||
8a0662d9 RW |
1484 | struct acpi_device *acpi_get_next_child(struct device *dev, |
1485 | struct acpi_device *child) | |
1486 | { | |
1487 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
1488 | struct list_head *head, *next; | |
1489 | ||
1490 | if (!adev) | |
1491 | return NULL; | |
1492 | ||
1493 | head = &adev->children; | |
1494 | if (list_empty(head)) | |
1495 | return NULL; | |
1496 | ||
1497 | if (!child) | |
1498 | return list_first_entry(head, struct acpi_device, node); | |
1499 | ||
1500 | next = child->node.next; | |
1501 | return next == head ? NULL : list_entry(next, struct acpi_device, node); | |
1502 | } | |
1503 | ||
9e89dde2 ZR |
1504 | /* -------------------------------------------------------------------------- |
1505 | Driver Management | |
1506 | -------------------------------------------------------------------------- */ | |
9e89dde2 ZR |
1507 | /** |
1508 | * acpi_bus_register_driver - register a driver with the ACPI bus | |
1509 | * @driver: driver being registered | |
1510 | * | |
1511 | * Registers a driver with the ACPI bus. Searches the namespace for all | |
1512 | * devices that match the driver's criteria and binds. Returns zero for | |
1513 | * success or a negative error status for failure. | |
1514 | */ | |
1515 | int acpi_bus_register_driver(struct acpi_driver *driver) | |
1da177e4 | 1516 | { |
1890a97a | 1517 | int ret; |
1da177e4 | 1518 | |
9e89dde2 ZR |
1519 | if (acpi_disabled) |
1520 | return -ENODEV; | |
1890a97a PM |
1521 | driver->drv.name = driver->name; |
1522 | driver->drv.bus = &acpi_bus_type; | |
1523 | driver->drv.owner = driver->owner; | |
1da177e4 | 1524 | |
1890a97a PM |
1525 | ret = driver_register(&driver->drv); |
1526 | return ret; | |
9e89dde2 | 1527 | } |
1da177e4 | 1528 | |
9e89dde2 ZR |
1529 | EXPORT_SYMBOL(acpi_bus_register_driver); |
1530 | ||
1531 | /** | |
b27b14ce | 1532 | * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus |
9e89dde2 ZR |
1533 | * @driver: driver to unregister |
1534 | * | |
1535 | * Unregisters a driver with the ACPI bus. Searches the namespace for all | |
1536 | * devices that match the driver's criteria and unbinds. | |
1537 | */ | |
1538 | void acpi_bus_unregister_driver(struct acpi_driver *driver) | |
1539 | { | |
1890a97a | 1540 | driver_unregister(&driver->drv); |
9e89dde2 ZR |
1541 | } |
1542 | ||
1543 | EXPORT_SYMBOL(acpi_bus_unregister_driver); | |
1544 | ||
9e89dde2 ZR |
1545 | /* -------------------------------------------------------------------------- |
1546 | Device Enumeration | |
1547 | -------------------------------------------------------------------------- */ | |
5c478f49 BH |
1548 | static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) |
1549 | { | |
456de893 | 1550 | struct acpi_device *device = NULL; |
5c478f49 | 1551 | acpi_status status; |
5c478f49 BH |
1552 | |
1553 | /* | |
1554 | * Fixed hardware devices do not appear in the namespace and do not | |
1555 | * have handles, but we fabricate acpi_devices for them, so we have | |
1556 | * to deal with them specially. | |
1557 | */ | |
456de893 | 1558 | if (!handle) |
5c478f49 BH |
1559 | return acpi_root; |
1560 | ||
1561 | do { | |
1562 | status = acpi_get_parent(handle, &handle); | |
5c478f49 | 1563 | if (ACPI_FAILURE(status)) |
456de893 RW |
1564 | return status == AE_NULL_ENTRY ? NULL : acpi_root; |
1565 | } while (acpi_bus_get_device(handle, &device)); | |
1566 | return device; | |
5c478f49 BH |
1567 | } |
1568 | ||
9e89dde2 ZR |
1569 | acpi_status |
1570 | acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) | |
1571 | { | |
1572 | acpi_status status; | |
1573 | acpi_handle tmp; | |
1574 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
1575 | union acpi_object *obj; | |
1576 | ||
1577 | status = acpi_get_handle(handle, "_EJD", &tmp); | |
1578 | if (ACPI_FAILURE(status)) | |
1579 | return status; | |
1580 | ||
1581 | status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); | |
1582 | if (ACPI_SUCCESS(status)) { | |
1583 | obj = buffer.pointer; | |
3b5fee59 HM |
1584 | status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, |
1585 | ejd); | |
9e89dde2 ZR |
1586 | kfree(buffer.pointer); |
1587 | } | |
1588 | return status; | |
1589 | } | |
1590 | EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); | |
1591 | ||
e88c9c60 RW |
1592 | static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle, |
1593 | struct acpi_device_wakeup *wakeup) | |
9e89dde2 | 1594 | { |
b581a7f9 RW |
1595 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1596 | union acpi_object *package = NULL; | |
9e89dde2 | 1597 | union acpi_object *element = NULL; |
b581a7f9 | 1598 | acpi_status status; |
e88c9c60 | 1599 | int err = -ENODATA; |
9e89dde2 | 1600 | |
b581a7f9 | 1601 | if (!wakeup) |
e88c9c60 | 1602 | return -EINVAL; |
9e89dde2 | 1603 | |
993cbe59 | 1604 | INIT_LIST_HEAD(&wakeup->resources); |
9e89dde2 | 1605 | |
b581a7f9 RW |
1606 | /* _PRW */ |
1607 | status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); | |
1608 | if (ACPI_FAILURE(status)) { | |
1609 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); | |
e88c9c60 | 1610 | return err; |
b581a7f9 RW |
1611 | } |
1612 | ||
1613 | package = (union acpi_object *)buffer.pointer; | |
1614 | ||
e88c9c60 | 1615 | if (!package || package->package.count < 2) |
b581a7f9 | 1616 | goto out; |
b581a7f9 | 1617 | |
9e89dde2 | 1618 | element = &(package->package.elements[0]); |
e88c9c60 | 1619 | if (!element) |
b581a7f9 | 1620 | goto out; |
e88c9c60 | 1621 | |
9e89dde2 ZR |
1622 | if (element->type == ACPI_TYPE_PACKAGE) { |
1623 | if ((element->package.count < 2) || | |
1624 | (element->package.elements[0].type != | |
1625 | ACPI_TYPE_LOCAL_REFERENCE) | |
e88c9c60 | 1626 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) |
b581a7f9 | 1627 | goto out; |
e88c9c60 | 1628 | |
b581a7f9 | 1629 | wakeup->gpe_device = |
9e89dde2 | 1630 | element->package.elements[0].reference.handle; |
b581a7f9 | 1631 | wakeup->gpe_number = |
9e89dde2 ZR |
1632 | (u32) element->package.elements[1].integer.value; |
1633 | } else if (element->type == ACPI_TYPE_INTEGER) { | |
b581a7f9 RW |
1634 | wakeup->gpe_device = NULL; |
1635 | wakeup->gpe_number = element->integer.value; | |
1636 | } else { | |
b581a7f9 RW |
1637 | goto out; |
1638 | } | |
9e89dde2 ZR |
1639 | |
1640 | element = &(package->package.elements[1]); | |
e88c9c60 | 1641 | if (element->type != ACPI_TYPE_INTEGER) |
b581a7f9 | 1642 | goto out; |
e88c9c60 | 1643 | |
b581a7f9 | 1644 | wakeup->sleep_state = element->integer.value; |
9e89dde2 | 1645 | |
e88c9c60 RW |
1646 | err = acpi_extract_power_resources(package, 2, &wakeup->resources); |
1647 | if (err) | |
b581a7f9 | 1648 | goto out; |
9e89dde2 | 1649 | |
0596a52b RW |
1650 | if (!list_empty(&wakeup->resources)) { |
1651 | int sleep_state; | |
9e89dde2 | 1652 | |
b5d667eb RW |
1653 | err = acpi_power_wakeup_list_init(&wakeup->resources, |
1654 | &sleep_state); | |
1655 | if (err) { | |
1656 | acpi_handle_warn(handle, "Retrieving current states " | |
1657 | "of wakeup power resources failed\n"); | |
1658 | acpi_power_resources_list_free(&wakeup->resources); | |
1659 | goto out; | |
1660 | } | |
0596a52b RW |
1661 | if (sleep_state < wakeup->sleep_state) { |
1662 | acpi_handle_warn(handle, "Overriding _PRW sleep state " | |
1663 | "(S%d) by S%d from power resources\n", | |
1664 | (int)wakeup->sleep_state, sleep_state); | |
1665 | wakeup->sleep_state = sleep_state; | |
1666 | } | |
1667 | } | |
9874647b | 1668 | |
b581a7f9 RW |
1669 | out: |
1670 | kfree(buffer.pointer); | |
e88c9c60 | 1671 | return err; |
1da177e4 LT |
1672 | } |
1673 | ||
bd9b2f9a | 1674 | static void acpi_wakeup_gpe_init(struct acpi_device *device) |
1da177e4 | 1675 | { |
29b71a1c | 1676 | struct acpi_device_id button_device_ids[] = { |
29b71a1c | 1677 | {"PNP0C0C", 0}, |
b7e38304 | 1678 | {"PNP0C0D", 0}, |
29b71a1c TR |
1679 | {"PNP0C0E", 0}, |
1680 | {"", 0}, | |
1681 | }; | |
bd9b2f9a | 1682 | struct acpi_device_wakeup *wakeup = &device->wakeup; |
f517709d RW |
1683 | acpi_status status; |
1684 | acpi_event_status event_status; | |
1685 | ||
bd9b2f9a | 1686 | wakeup->flags.notifier_present = 0; |
f517709d RW |
1687 | |
1688 | /* Power button, Lid switch always enable wakeup */ | |
1689 | if (!acpi_match_device_ids(device, button_device_ids)) { | |
bd9b2f9a | 1690 | wakeup->flags.run_wake = 1; |
b7e38304 ZR |
1691 | if (!acpi_match_device_ids(device, &button_device_ids[1])) { |
1692 | /* Do not use Lid/sleep button for S5 wakeup */ | |
bd9b2f9a RW |
1693 | if (wakeup->sleep_state == ACPI_STATE_S5) |
1694 | wakeup->sleep_state = ACPI_STATE_S4; | |
b7e38304 | 1695 | } |
bd9b2f9a | 1696 | acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number); |
f2b56bc8 | 1697 | device_set_wakeup_capable(&device->dev, true); |
f517709d RW |
1698 | return; |
1699 | } | |
1700 | ||
bd9b2f9a RW |
1701 | acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device, |
1702 | wakeup->gpe_number); | |
1703 | status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number, | |
1704 | &event_status); | |
1705 | if (ACPI_FAILURE(status)) | |
1706 | return; | |
1707 | ||
2f857234 | 1708 | wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER); |
f517709d RW |
1709 | } |
1710 | ||
d57d09a4 | 1711 | static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
f517709d | 1712 | { |
e88c9c60 | 1713 | int err; |
29b71a1c | 1714 | |
d57d09a4 | 1715 | /* Presence of _PRW indicates wake capable */ |
952c63e9 | 1716 | if (!acpi_has_method(device->handle, "_PRW")) |
d57d09a4 RW |
1717 | return; |
1718 | ||
e88c9c60 RW |
1719 | err = acpi_bus_extract_wakeup_device_power_package(device->handle, |
1720 | &device->wakeup); | |
1721 | if (err) { | |
1722 | dev_err(&device->dev, "_PRW evaluation error: %d\n", err); | |
d57d09a4 | 1723 | return; |
9e89dde2 | 1724 | } |
1da177e4 | 1725 | |
9e89dde2 | 1726 | device->wakeup.flags.valid = 1; |
9b83ccd2 | 1727 | device->wakeup.prepare_count = 0; |
bd9b2f9a | 1728 | acpi_wakeup_gpe_init(device); |
729b2bdb ZY |
1729 | /* Call _PSW/_DSW object to disable its ability to wake the sleeping |
1730 | * system for the ACPI device with the _PRW object. | |
1731 | * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW. | |
1732 | * So it is necessary to call _DSW object first. Only when it is not | |
1733 | * present will the _PSW object used. | |
1734 | */ | |
e88c9c60 RW |
1735 | err = acpi_device_sleep_wake(device, 0, 0, 0); |
1736 | if (err) | |
77e76609 RW |
1737 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
1738 | "error in _DSW or _PSW evaluation\n")); | |
1da177e4 | 1739 | } |
1da177e4 | 1740 | |
f33ce568 RW |
1741 | static void acpi_bus_init_power_state(struct acpi_device *device, int state) |
1742 | { | |
1743 | struct acpi_device_power_state *ps = &device->power.states[state]; | |
ef85bdbe RW |
1744 | char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; |
1745 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
f33ce568 | 1746 | acpi_status status; |
bf325f95 | 1747 | |
f33ce568 RW |
1748 | INIT_LIST_HEAD(&ps->resources); |
1749 | ||
ef85bdbe RW |
1750 | /* Evaluate "_PRx" to get referenced power resources */ |
1751 | status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer); | |
1752 | if (ACPI_SUCCESS(status)) { | |
1753 | union acpi_object *package = buffer.pointer; | |
1754 | ||
1755 | if (buffer.length && package | |
1756 | && package->type == ACPI_TYPE_PACKAGE | |
1757 | && package->package.count) { | |
e88c9c60 RW |
1758 | int err = acpi_extract_power_resources(package, 0, |
1759 | &ps->resources); | |
1760 | if (!err) | |
ef85bdbe | 1761 | device->power.flags.power_resources = 1; |
f33ce568 | 1762 | } |
ef85bdbe | 1763 | ACPI_FREE(buffer.pointer); |
f33ce568 RW |
1764 | } |
1765 | ||
1766 | /* Evaluate "_PSx" to see if we can do explicit sets */ | |
ef85bdbe | 1767 | pathname[2] = 'S'; |
952c63e9 | 1768 | if (acpi_has_method(device->handle, pathname)) |
f33ce568 RW |
1769 | ps->flags.explicit_set = 1; |
1770 | ||
1771 | /* | |
1772 | * State is valid if there are means to put the device into it. | |
1773 | * D3hot is only valid if _PR3 present. | |
1774 | */ | |
ef85bdbe | 1775 | if (!list_empty(&ps->resources) |
f33ce568 RW |
1776 | || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) { |
1777 | ps->flags.valid = 1; | |
1778 | ps->flags.os_accessible = 1; | |
1779 | } | |
1780 | ||
1781 | ps->power = -1; /* Unknown - driver assigned */ | |
1782 | ps->latency = -1; /* Unknown - driver assigned */ | |
1783 | } | |
1784 | ||
d43e167d | 1785 | static void acpi_bus_get_power_flags(struct acpi_device *device) |
1da177e4 | 1786 | { |
8bc5053b | 1787 | u32 i; |
1a365616 | 1788 | |
d43e167d | 1789 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ |
952c63e9 JL |
1790 | if (!acpi_has_method(device->handle, "_PS0") && |
1791 | !acpi_has_method(device->handle, "_PR0")) | |
1792 | return; | |
1a365616 | 1793 | |
d43e167d | 1794 | device->flags.power_manageable = 1; |
4be44fcd | 1795 | |
9e89dde2 ZR |
1796 | /* |
1797 | * Power Management Flags | |
1798 | */ | |
952c63e9 | 1799 | if (acpi_has_method(device->handle, "_PSC")) |
9e89dde2 | 1800 | device->power.flags.explicit_get = 1; |
f25c0ae2 | 1801 | |
952c63e9 | 1802 | if (acpi_has_method(device->handle, "_IRC")) |
9e89dde2 | 1803 | device->power.flags.inrush_current = 1; |
1da177e4 | 1804 | |
f25c0ae2 RW |
1805 | if (acpi_has_method(device->handle, "_DSW")) |
1806 | device->power.flags.dsw_present = 1; | |
1807 | ||
9e89dde2 ZR |
1808 | /* |
1809 | * Enumerate supported power management states | |
1810 | */ | |
f33ce568 RW |
1811 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) |
1812 | acpi_bus_init_power_state(device, i); | |
bf325f95 | 1813 | |
0b224527 | 1814 | INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); |
1da177e4 | 1815 | |
9e89dde2 ZR |
1816 | /* Set defaults for D0 and D3 states (always valid) */ |
1817 | device->power.states[ACPI_STATE_D0].flags.valid = 1; | |
1818 | device->power.states[ACPI_STATE_D0].power = 100; | |
8ad928d5 RW |
1819 | device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; |
1820 | device->power.states[ACPI_STATE_D3_COLD].power = 0; | |
c8f7a62c | 1821 | |
5c7dd710 RW |
1822 | /* Set D3cold's explicit_set flag if _PS3 exists. */ |
1823 | if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set) | |
1824 | device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1; | |
1825 | ||
1399dfcd AL |
1826 | /* Presence of _PS3 or _PRx means we can put the device into D3 cold */ |
1827 | if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set || | |
1828 | device->power.flags.power_resources) | |
1829 | device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1; | |
1830 | ||
1b1f3e16 | 1831 | if (acpi_bus_init_power(device)) |
b3785492 | 1832 | device->flags.power_manageable = 0; |
9e89dde2 | 1833 | } |
c8f7a62c | 1834 | |
d43e167d | 1835 | static void acpi_bus_get_flags(struct acpi_device *device) |
1da177e4 | 1836 | { |
1da177e4 | 1837 | /* Presence of _STA indicates 'dynamic_status' */ |
952c63e9 | 1838 | if (acpi_has_method(device->handle, "_STA")) |
1da177e4 LT |
1839 | device->flags.dynamic_status = 1; |
1840 | ||
1da177e4 | 1841 | /* Presence of _RMV indicates 'removable' */ |
952c63e9 | 1842 | if (acpi_has_method(device->handle, "_RMV")) |
1da177e4 LT |
1843 | device->flags.removable = 1; |
1844 | ||
1845 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ | |
952c63e9 JL |
1846 | if (acpi_has_method(device->handle, "_EJD") || |
1847 | acpi_has_method(device->handle, "_EJ0")) | |
1da177e4 | 1848 | device->flags.ejectable = 1; |
1da177e4 LT |
1849 | } |
1850 | ||
c7bcb4e9 | 1851 | static void acpi_device_get_busid(struct acpi_device *device) |
1da177e4 | 1852 | { |
4be44fcd LB |
1853 | char bus_id[5] = { '?', 0 }; |
1854 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; | |
1855 | int i = 0; | |
1da177e4 LT |
1856 | |
1857 | /* | |
1858 | * Bus ID | |
1859 | * ------ | |
1860 | * The device's Bus ID is simply the object name. | |
1861 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? | |
1862 | */ | |
859ac9a4 | 1863 | if (ACPI_IS_ROOT_DEVICE(device)) { |
1da177e4 | 1864 | strcpy(device->pnp.bus_id, "ACPI"); |
859ac9a4 BH |
1865 | return; |
1866 | } | |
1867 | ||
1868 | switch (device->device_type) { | |
1da177e4 LT |
1869 | case ACPI_BUS_TYPE_POWER_BUTTON: |
1870 | strcpy(device->pnp.bus_id, "PWRF"); | |
1871 | break; | |
1872 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
1873 | strcpy(device->pnp.bus_id, "SLPF"); | |
1874 | break; | |
1875 | default: | |
66b7ed40 | 1876 | acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); |
1da177e4 LT |
1877 | /* Clean up trailing underscores (if any) */ |
1878 | for (i = 3; i > 1; i--) { | |
1879 | if (bus_id[i] == '_') | |
1880 | bus_id[i] = '\0'; | |
1881 | else | |
1882 | break; | |
1883 | } | |
1884 | strcpy(device->pnp.bus_id, bus_id); | |
1885 | break; | |
1886 | } | |
1887 | } | |
1888 | ||
ebf4df8d JL |
1889 | /* |
1890 | * acpi_ata_match - see if an acpi object is an ATA device | |
1891 | * | |
1892 | * If an acpi object has one of the ACPI ATA methods defined, | |
1893 | * then we can safely call it an ATA device. | |
1894 | */ | |
1895 | bool acpi_ata_match(acpi_handle handle) | |
1896 | { | |
1897 | return acpi_has_method(handle, "_GTF") || | |
1898 | acpi_has_method(handle, "_GTM") || | |
1899 | acpi_has_method(handle, "_STM") || | |
1900 | acpi_has_method(handle, "_SDD"); | |
1901 | } | |
1902 | ||
54735266 | 1903 | /* |
d4e1a692 | 1904 | * acpi_bay_match - see if an acpi object is an ejectable driver bay |
54735266 ZR |
1905 | * |
1906 | * If an acpi object is ejectable and has one of the ACPI ATA methods defined, | |
1907 | * then we can safely call it an ejectable drive bay | |
1908 | */ | |
ebf4df8d | 1909 | bool acpi_bay_match(acpi_handle handle) |
d4e1a692 | 1910 | { |
54735266 ZR |
1911 | acpi_handle phandle; |
1912 | ||
952c63e9 | 1913 | if (!acpi_has_method(handle, "_EJ0")) |
ebf4df8d JL |
1914 | return false; |
1915 | if (acpi_ata_match(handle)) | |
1916 | return true; | |
1917 | if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) | |
1918 | return false; | |
54735266 | 1919 | |
ebf4df8d | 1920 | return acpi_ata_match(phandle); |
54735266 ZR |
1921 | } |
1922 | ||
b43109fa | 1923 | bool acpi_device_is_battery(struct acpi_device *adev) |
1e2380cd | 1924 | { |
b43109fa | 1925 | struct acpi_hardware_id *hwid; |
1e2380cd | 1926 | |
b43109fa RW |
1927 | list_for_each_entry(hwid, &adev->pnp.ids, list) |
1928 | if (!strcmp("PNP0C0A", hwid->id)) | |
1929 | return true; | |
1e2380cd | 1930 | |
b43109fa | 1931 | return false; |
1e2380cd RW |
1932 | } |
1933 | ||
b43109fa | 1934 | static bool is_ejectable_bay(struct acpi_device *adev) |
1e2380cd | 1935 | { |
b43109fa RW |
1936 | acpi_handle handle = adev->handle; |
1937 | ||
1938 | if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev)) | |
1e2380cd RW |
1939 | return true; |
1940 | ||
1941 | return acpi_bay_match(handle); | |
1942 | } | |
1943 | ||
3620f2f2 | 1944 | /* |
d4e1a692 | 1945 | * acpi_dock_match - see if an acpi object has a _DCK method |
3620f2f2 | 1946 | */ |
ebf4df8d | 1947 | bool acpi_dock_match(acpi_handle handle) |
3620f2f2 | 1948 | { |
ebf4df8d | 1949 | return acpi_has_method(handle, "_DCK"); |
3620f2f2 FS |
1950 | } |
1951 | ||
620e112c | 1952 | const char *acpi_device_hid(struct acpi_device *device) |
15b8dd53 | 1953 | { |
7f47fa6c | 1954 | struct acpi_hardware_id *hid; |
15b8dd53 | 1955 | |
2b2ae7c7 TR |
1956 | if (list_empty(&device->pnp.ids)) |
1957 | return dummy_hid; | |
1958 | ||
7f47fa6c BH |
1959 | hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); |
1960 | return hid->id; | |
1961 | } | |
1962 | EXPORT_SYMBOL(acpi_device_hid); | |
15b8dd53 | 1963 | |
d4e1a692 | 1964 | static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) |
7f47fa6c BH |
1965 | { |
1966 | struct acpi_hardware_id *id; | |
15b8dd53 | 1967 | |
7f47fa6c BH |
1968 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
1969 | if (!id) | |
1970 | return; | |
15b8dd53 | 1971 | |
581de59e | 1972 | id->id = kstrdup(dev_id, GFP_KERNEL); |
7f47fa6c BH |
1973 | if (!id->id) { |
1974 | kfree(id); | |
1975 | return; | |
15b8dd53 BM |
1976 | } |
1977 | ||
d4e1a692 TK |
1978 | list_add_tail(&id->list, &pnp->ids); |
1979 | pnp->type.hardware_id = 1; | |
15b8dd53 BM |
1980 | } |
1981 | ||
222e82ac DW |
1982 | /* |
1983 | * Old IBM workstations have a DSDT bug wherein the SMBus object | |
1984 | * lacks the SMBUS01 HID and the methods do not have the necessary "_" | |
1985 | * prefix. Work around this. | |
1986 | */ | |
ebf4df8d | 1987 | static bool acpi_ibm_smbus_match(acpi_handle handle) |
222e82ac | 1988 | { |
ebf4df8d JL |
1989 | char node_name[ACPI_PATH_SEGMENT_LENGTH]; |
1990 | struct acpi_buffer path = { sizeof(node_name), node_name }; | |
222e82ac DW |
1991 | |
1992 | if (!dmi_name_in_vendors("IBM")) | |
ebf4df8d | 1993 | return false; |
222e82ac DW |
1994 | |
1995 | /* Look for SMBS object */ | |
ebf4df8d JL |
1996 | if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || |
1997 | strcmp("SMBS", path.pointer)) | |
1998 | return false; | |
222e82ac DW |
1999 | |
2000 | /* Does it have the necessary (but misnamed) methods? */ | |
952c63e9 JL |
2001 | if (acpi_has_method(handle, "SBI") && |
2002 | acpi_has_method(handle, "SBR") && | |
2003 | acpi_has_method(handle, "SBW")) | |
ebf4df8d JL |
2004 | return true; |
2005 | ||
2006 | return false; | |
222e82ac DW |
2007 | } |
2008 | ||
ae3caa80 JL |
2009 | static bool acpi_object_is_system_bus(acpi_handle handle) |
2010 | { | |
2011 | acpi_handle tmp; | |
2012 | ||
2013 | if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) && | |
2014 | tmp == handle) | |
2015 | return true; | |
2016 | if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) && | |
2017 | tmp == handle) | |
2018 | return true; | |
2019 | ||
2020 | return false; | |
2021 | } | |
2022 | ||
c0af4175 TK |
2023 | static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, |
2024 | int device_type) | |
1da177e4 | 2025 | { |
4be44fcd | 2026 | acpi_status status; |
57f3674f | 2027 | struct acpi_device_info *info; |
78e25fef | 2028 | struct acpi_pnp_device_id_list *cid_list; |
7f47fa6c | 2029 | int i; |
1da177e4 | 2030 | |
c0af4175 | 2031 | switch (device_type) { |
1da177e4 | 2032 | case ACPI_BUS_TYPE_DEVICE: |
c0af4175 TK |
2033 | if (handle == ACPI_ROOT_OBJECT) { |
2034 | acpi_add_id(pnp, ACPI_SYSTEM_HID); | |
859ac9a4 BH |
2035 | break; |
2036 | } | |
2037 | ||
c0af4175 | 2038 | status = acpi_get_object_info(handle, &info); |
1da177e4 | 2039 | if (ACPI_FAILURE(status)) { |
c0af4175 TK |
2040 | pr_err(PREFIX "%s: Error reading device info\n", |
2041 | __func__); | |
1da177e4 LT |
2042 | return; |
2043 | } | |
2044 | ||
549e6845 | 2045 | if (info->valid & ACPI_VALID_HID) { |
c0af4175 | 2046 | acpi_add_id(pnp, info->hardware_id.string); |
549e6845 RW |
2047 | pnp->type.platform_id = 1; |
2048 | } | |
57f3674f | 2049 | if (info->valid & ACPI_VALID_CID) { |
15b8dd53 | 2050 | cid_list = &info->compatible_id_list; |
57f3674f | 2051 | for (i = 0; i < cid_list->count; i++) |
c0af4175 | 2052 | acpi_add_id(pnp, cid_list->ids[i].string); |
57f3674f | 2053 | } |
1da177e4 | 2054 | if (info->valid & ACPI_VALID_ADR) { |
c0af4175 TK |
2055 | pnp->bus_address = info->address; |
2056 | pnp->type.bus_address = 1; | |
1da177e4 | 2057 | } |
ccf78040 | 2058 | if (info->valid & ACPI_VALID_UID) |
c0af4175 | 2059 | pnp->unique_id = kstrdup(info->unique_id.string, |
ccf78040 | 2060 | GFP_KERNEL); |
ae843332 | 2061 | |
a83893ae BH |
2062 | kfree(info); |
2063 | ||
57f3674f BH |
2064 | /* |
2065 | * Some devices don't reliably have _HIDs & _CIDs, so add | |
2066 | * synthetic HIDs to make sure drivers can find them. | |
2067 | */ | |
c0af4175 TK |
2068 | if (acpi_is_video_device(handle)) |
2069 | acpi_add_id(pnp, ACPI_VIDEO_HID); | |
ebf4df8d | 2070 | else if (acpi_bay_match(handle)) |
c0af4175 | 2071 | acpi_add_id(pnp, ACPI_BAY_HID); |
ebf4df8d | 2072 | else if (acpi_dock_match(handle)) |
c0af4175 | 2073 | acpi_add_id(pnp, ACPI_DOCK_HID); |
ebf4df8d | 2074 | else if (acpi_ibm_smbus_match(handle)) |
c0af4175 | 2075 | acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); |
ae3caa80 JL |
2076 | else if (list_empty(&pnp->ids) && |
2077 | acpi_object_is_system_bus(handle)) { | |
2078 | /* \_SB, \_TZ, LNXSYBUS */ | |
2079 | acpi_add_id(pnp, ACPI_BUS_HID); | |
c0af4175 TK |
2080 | strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); |
2081 | strcpy(pnp->device_class, ACPI_BUS_CLASS); | |
b7b30de5 | 2082 | } |
54735266 | 2083 | |
1da177e4 LT |
2084 | break; |
2085 | case ACPI_BUS_TYPE_POWER: | |
c0af4175 | 2086 | acpi_add_id(pnp, ACPI_POWER_HID); |
1da177e4 LT |
2087 | break; |
2088 | case ACPI_BUS_TYPE_PROCESSOR: | |
c0af4175 | 2089 | acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID); |
1da177e4 | 2090 | break; |
1da177e4 | 2091 | case ACPI_BUS_TYPE_THERMAL: |
c0af4175 | 2092 | acpi_add_id(pnp, ACPI_THERMAL_HID); |
1da177e4 LT |
2093 | break; |
2094 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
c0af4175 | 2095 | acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF); |
1da177e4 LT |
2096 | break; |
2097 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
c0af4175 | 2098 | acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); |
1da177e4 LT |
2099 | break; |
2100 | } | |
1da177e4 LT |
2101 | } |
2102 | ||
c0af4175 TK |
2103 | void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) |
2104 | { | |
2105 | struct acpi_hardware_id *id, *tmp; | |
2106 | ||
2107 | list_for_each_entry_safe(id, tmp, &pnp->ids, list) { | |
2108 | kfree(id->id); | |
2109 | kfree(id); | |
2110 | } | |
2111 | kfree(pnp->unique_id); | |
2112 | } | |
2113 | ||
82c7d5ef RW |
2114 | void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, |
2115 | int type, unsigned long long sta) | |
1da177e4 | 2116 | { |
d43e167d RW |
2117 | INIT_LIST_HEAD(&device->pnp.ids); |
2118 | device->device_type = type; | |
2119 | device->handle = handle; | |
2120 | device->parent = acpi_bus_get_parent(handle); | |
8a0662d9 | 2121 | device->fwnode.type = FWNODE_ACPI; |
25db115b | 2122 | acpi_set_device_status(device, sta); |
d43e167d | 2123 | acpi_device_get_busid(device); |
c0af4175 | 2124 | acpi_set_pnp_ids(handle, &device->pnp, type); |
ffdcd955 | 2125 | acpi_init_properties(device); |
d43e167d | 2126 | acpi_bus_get_flags(device); |
2c0d4fe0 | 2127 | device->flags.match_driver = false; |
202317a5 RW |
2128 | device->flags.initialized = true; |
2129 | device->flags.visited = false; | |
cf860be6 RW |
2130 | device_initialize(&device->dev); |
2131 | dev_set_uevent_suppress(&device->dev, true); | |
2132 | } | |
bc3b0772 | 2133 | |
cf860be6 RW |
2134 | void acpi_device_add_finalize(struct acpi_device *device) |
2135 | { | |
2136 | dev_set_uevent_suppress(&device->dev, false); | |
2137 | kobject_uevent(&device->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
2138 | } |
2139 | ||
5c478f49 BH |
2140 | static int acpi_add_single_object(struct acpi_device **child, |
2141 | acpi_handle handle, int type, | |
2c0d4fe0 | 2142 | unsigned long long sta) |
1da177e4 | 2143 | { |
77c24888 BH |
2144 | int result; |
2145 | struct acpi_device *device; | |
29aaefa6 | 2146 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1da177e4 | 2147 | |
36bcbec7 | 2148 | device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); |
1da177e4 | 2149 | if (!device) { |
6468463a | 2150 | printk(KERN_ERR PREFIX "Memory allocation error\n"); |
d550d98d | 2151 | return -ENOMEM; |
1da177e4 | 2152 | } |
1da177e4 | 2153 | |
d43e167d RW |
2154 | acpi_init_device_object(device, handle, type, sta); |
2155 | acpi_bus_get_power_flags(device); | |
d57d09a4 | 2156 | acpi_bus_get_wakeup_device_flags(device); |
1da177e4 | 2157 | |
cf860be6 | 2158 | result = acpi_device_add(device, acpi_device_release); |
d43e167d | 2159 | if (result) { |
718fb0de | 2160 | acpi_device_release(&device->dev); |
d43e167d RW |
2161 | return result; |
2162 | } | |
1da177e4 | 2163 | |
d43e167d | 2164 | acpi_power_add_remove_device(device, true); |
cf860be6 | 2165 | acpi_device_add_finalize(device); |
d43e167d RW |
2166 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
2167 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n", | |
2168 | dev_name(&device->dev), (char *) buffer.pointer, | |
2169 | device->parent ? dev_name(&device->parent->dev) : "(null)")); | |
2170 | kfree(buffer.pointer); | |
2171 | *child = device; | |
2172 | return 0; | |
bf325f95 RW |
2173 | } |
2174 | ||
778cbc1d BH |
2175 | static int acpi_bus_type_and_status(acpi_handle handle, int *type, |
2176 | unsigned long long *sta) | |
1da177e4 | 2177 | { |
778cbc1d BH |
2178 | acpi_status status; |
2179 | acpi_object_type acpi_type; | |
1da177e4 | 2180 | |
778cbc1d | 2181 | status = acpi_get_type(handle, &acpi_type); |
51a85faf | 2182 | if (ACPI_FAILURE(status)) |
778cbc1d | 2183 | return -ENODEV; |
4be44fcd | 2184 | |
778cbc1d | 2185 | switch (acpi_type) { |
51a85faf BH |
2186 | case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ |
2187 | case ACPI_TYPE_DEVICE: | |
778cbc1d BH |
2188 | *type = ACPI_BUS_TYPE_DEVICE; |
2189 | status = acpi_bus_get_status_handle(handle, sta); | |
2190 | if (ACPI_FAILURE(status)) | |
2191 | return -ENODEV; | |
51a85faf BH |
2192 | break; |
2193 | case ACPI_TYPE_PROCESSOR: | |
778cbc1d BH |
2194 | *type = ACPI_BUS_TYPE_PROCESSOR; |
2195 | status = acpi_bus_get_status_handle(handle, sta); | |
2196 | if (ACPI_FAILURE(status)) | |
2197 | return -ENODEV; | |
51a85faf BH |
2198 | break; |
2199 | case ACPI_TYPE_THERMAL: | |
778cbc1d BH |
2200 | *type = ACPI_BUS_TYPE_THERMAL; |
2201 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
2202 | break; |
2203 | case ACPI_TYPE_POWER: | |
778cbc1d BH |
2204 | *type = ACPI_BUS_TYPE_POWER; |
2205 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
2206 | break; |
2207 | default: | |
778cbc1d | 2208 | return -ENODEV; |
51a85faf | 2209 | } |
1da177e4 | 2210 | |
778cbc1d BH |
2211 | return 0; |
2212 | } | |
2213 | ||
202317a5 RW |
2214 | bool acpi_device_is_present(struct acpi_device *adev) |
2215 | { | |
2216 | if (adev->status.present || adev->status.functional) | |
2217 | return true; | |
2218 | ||
2219 | adev->flags.initialized = false; | |
2220 | return false; | |
2221 | } | |
2222 | ||
4b59cc1f RW |
2223 | static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, |
2224 | char *idstr, | |
2225 | const struct acpi_device_id **matchid) | |
2226 | { | |
2227 | const struct acpi_device_id *devid; | |
2228 | ||
aca0a4eb RW |
2229 | if (handler->match) |
2230 | return handler->match(idstr, matchid); | |
2231 | ||
4b59cc1f RW |
2232 | for (devid = handler->ids; devid->id[0]; devid++) |
2233 | if (!strcmp((char *)devid->id, idstr)) { | |
2234 | if (matchid) | |
2235 | *matchid = devid; | |
2236 | ||
2237 | return true; | |
2238 | } | |
2239 | ||
2240 | return false; | |
2241 | } | |
2242 | ||
6b772e8f TK |
2243 | static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr, |
2244 | const struct acpi_device_id **matchid) | |
2245 | { | |
2246 | struct acpi_scan_handler *handler; | |
2247 | ||
2248 | list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) | |
2249 | if (acpi_scan_handler_matching(handler, idstr, matchid)) | |
2250 | return handler; | |
2251 | ||
2252 | return NULL; | |
2253 | } | |
2254 | ||
3f8055c3 RW |
2255 | void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) |
2256 | { | |
3f8055c3 RW |
2257 | if (!!hotplug->enabled == !!val) |
2258 | return; | |
2259 | ||
2260 | mutex_lock(&acpi_scan_lock); | |
2261 | ||
2262 | hotplug->enabled = val; | |
3f8055c3 RW |
2263 | |
2264 | mutex_unlock(&acpi_scan_lock); | |
2265 | } | |
2266 | ||
3c2cc7ff | 2267 | static void acpi_scan_init_hotplug(struct acpi_device *adev) |
a33ec399 | 2268 | { |
6b772e8f | 2269 | struct acpi_hardware_id *hwid; |
a33ec399 | 2270 | |
b43109fa | 2271 | if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) { |
1e2380cd RW |
2272 | acpi_dock_add(adev); |
2273 | return; | |
2274 | } | |
3c2cc7ff RW |
2275 | list_for_each_entry(hwid, &adev->pnp.ids, list) { |
2276 | struct acpi_scan_handler *handler; | |
a33ec399 | 2277 | |
6b772e8f | 2278 | handler = acpi_scan_match_handler(hwid->id, NULL); |
1a699476 RW |
2279 | if (handler) { |
2280 | adev->flags.hotplug_notify = true; | |
2281 | break; | |
2282 | } | |
3c2cc7ff | 2283 | } |
a33ec399 RW |
2284 | } |
2285 | ||
40e7fcb1 LT |
2286 | static void acpi_device_dep_initialize(struct acpi_device *adev) |
2287 | { | |
2288 | struct acpi_dep_data *dep; | |
2289 | struct acpi_handle_list dep_devices; | |
2290 | acpi_status status; | |
2291 | int i; | |
2292 | ||
2293 | if (!acpi_has_method(adev->handle, "_DEP")) | |
2294 | return; | |
2295 | ||
2296 | status = acpi_evaluate_reference(adev->handle, "_DEP", NULL, | |
2297 | &dep_devices); | |
2298 | if (ACPI_FAILURE(status)) { | |
80167a24 | 2299 | dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n"); |
40e7fcb1 LT |
2300 | return; |
2301 | } | |
2302 | ||
2303 | for (i = 0; i < dep_devices.count; i++) { | |
2304 | struct acpi_device_info *info; | |
2305 | int skip; | |
2306 | ||
2307 | status = acpi_get_object_info(dep_devices.handles[i], &info); | |
2308 | if (ACPI_FAILURE(status)) { | |
80167a24 | 2309 | dev_dbg(&adev->dev, "Error reading _DEP device info\n"); |
40e7fcb1 LT |
2310 | continue; |
2311 | } | |
2312 | ||
2313 | /* | |
2314 | * Skip the dependency of Windows System Power | |
2315 | * Management Controller | |
2316 | */ | |
2317 | skip = info->valid & ACPI_VALID_HID && | |
2318 | !strcmp(info->hardware_id.string, "INT3396"); | |
2319 | ||
2320 | kfree(info); | |
2321 | ||
2322 | if (skip) | |
2323 | continue; | |
2324 | ||
2325 | dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL); | |
2326 | if (!dep) | |
2327 | return; | |
2328 | ||
2329 | dep->master = dep_devices.handles[i]; | |
2330 | dep->slave = adev->handle; | |
2331 | adev->dep_unmet++; | |
2332 | ||
2333 | mutex_lock(&acpi_dep_list_lock); | |
2334 | list_add_tail(&dep->node , &acpi_dep_list); | |
2335 | mutex_unlock(&acpi_dep_list_lock); | |
2336 | } | |
2337 | } | |
2338 | ||
e3863094 RW |
2339 | static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, |
2340 | void *not_used, void **return_value) | |
778cbc1d | 2341 | { |
805d410f | 2342 | struct acpi_device *device = NULL; |
778cbc1d BH |
2343 | int type; |
2344 | unsigned long long sta; | |
2345 | int result; | |
2346 | ||
4002bf38 RW |
2347 | acpi_bus_get_device(handle, &device); |
2348 | if (device) | |
2349 | goto out; | |
2350 | ||
778cbc1d BH |
2351 | result = acpi_bus_type_and_status(handle, &type, &sta); |
2352 | if (result) | |
2353 | return AE_OK; | |
2354 | ||
82c7d5ef RW |
2355 | if (type == ACPI_BUS_TYPE_POWER) { |
2356 | acpi_add_power_resource(handle); | |
2357 | return AE_OK; | |
2358 | } | |
2359 | ||
2c0d4fe0 | 2360 | acpi_add_single_object(&device, handle, type, sta); |
e3b87f8a | 2361 | if (!device) |
51a85faf | 2362 | return AE_CTRL_DEPTH; |
1da177e4 | 2363 | |
3c2cc7ff | 2364 | acpi_scan_init_hotplug(device); |
40e7fcb1 | 2365 | acpi_device_dep_initialize(device); |
3c2cc7ff | 2366 | |
4002bf38 | 2367 | out: |
51a85faf BH |
2368 | if (!*return_value) |
2369 | *return_value = device; | |
805d410f | 2370 | |
51a85faf BH |
2371 | return AE_OK; |
2372 | } | |
3fb02738 | 2373 | |
48459340 ZR |
2374 | static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data) |
2375 | { | |
2376 | bool *is_spi_i2c_slave_p = data; | |
2377 | ||
2378 | if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) | |
2379 | return 1; | |
2380 | ||
2381 | /* | |
2382 | * devices that are connected to UART still need to be enumerated to | |
2383 | * platform bus | |
2384 | */ | |
2385 | if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART) | |
2386 | *is_spi_i2c_slave_p = true; | |
2387 | ||
2388 | /* no need to do more checking */ | |
2389 | return -1; | |
2390 | } | |
2391 | ||
2392 | static void acpi_default_enumeration(struct acpi_device *device) | |
2393 | { | |
2394 | struct list_head resource_list; | |
2395 | bool is_spi_i2c_slave = false; | |
2396 | ||
48459340 ZR |
2397 | /* |
2398 | * Do not enemerate SPI/I2C slaves as they will be enuerated by their | |
2399 | * respective parents. | |
2400 | */ | |
2401 | INIT_LIST_HEAD(&resource_list); | |
2402 | acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave, | |
2403 | &is_spi_i2c_slave); | |
2404 | acpi_dev_free_resource_list(&resource_list); | |
2405 | if (!is_spi_i2c_slave) | |
2406 | acpi_create_platform_device(device); | |
2407 | } | |
2408 | ||
7d284352 | 2409 | static const struct acpi_device_id generic_device_ids[] = { |
ee892094 | 2410 | {ACPI_DT_NAMESPACE_HID, }, |
7d284352 RW |
2411 | {"", }, |
2412 | }; | |
2413 | ||
2414 | static int acpi_generic_device_attach(struct acpi_device *adev, | |
2415 | const struct acpi_device_id *not_used) | |
2416 | { | |
2417 | /* | |
ee892094 RW |
2418 | * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test |
2419 | * below can be unconditional. | |
7d284352 RW |
2420 | */ |
2421 | if (adev->data.of_compatible) | |
2422 | acpi_default_enumeration(adev); | |
2423 | ||
2424 | return 1; | |
2425 | } | |
2426 | ||
2427 | static struct acpi_scan_handler generic_device_handler = { | |
2428 | .ids = generic_device_ids, | |
2429 | .attach = acpi_generic_device_attach, | |
2430 | }; | |
2431 | ||
c5698074 | 2432 | static int acpi_scan_attach_handler(struct acpi_device *device) |
ca589f94 | 2433 | { |
c5698074 RW |
2434 | struct acpi_hardware_id *hwid; |
2435 | int ret = 0; | |
ca589f94 | 2436 | |
c5698074 | 2437 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
87b85b3c | 2438 | const struct acpi_device_id *devid; |
c5698074 | 2439 | struct acpi_scan_handler *handler; |
ca589f94 | 2440 | |
c5698074 RW |
2441 | handler = acpi_scan_match_handler(hwid->id, &devid); |
2442 | if (handler) { | |
d34afa9d RW |
2443 | if (!handler->attach) { |
2444 | device->pnp.type.platform_id = 0; | |
2445 | continue; | |
2446 | } | |
9cb32acf | 2447 | device->handler = handler; |
87b85b3c | 2448 | ret = handler->attach(device, devid); |
9cb32acf | 2449 | if (ret > 0) |
c5698074 | 2450 | break; |
9cb32acf RW |
2451 | |
2452 | device->handler = NULL; | |
2453 | if (ret < 0) | |
c5698074 | 2454 | break; |
ca589f94 RW |
2455 | } |
2456 | } | |
48459340 | 2457 | |
ca589f94 RW |
2458 | return ret; |
2459 | } | |
2460 | ||
2c22e652 | 2461 | static void acpi_bus_attach(struct acpi_device *device) |
51a85faf | 2462 | { |
2c22e652 | 2463 | struct acpi_device *child; |
1e2380cd | 2464 | acpi_handle ejd; |
ca589f94 | 2465 | int ret; |
3fb02738 | 2466 | |
1e2380cd RW |
2467 | if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd))) |
2468 | register_dock_dependent_device(device, ejd); | |
2469 | ||
2c22e652 | 2470 | acpi_bus_get_status(device); |
202317a5 | 2471 | /* Skip devices that are not present. */ |
2c22e652 RW |
2472 | if (!acpi_device_is_present(device)) { |
2473 | device->flags.visited = false; | |
1b1f3e16 | 2474 | device->flags.power_manageable = 0; |
2c22e652 RW |
2475 | return; |
2476 | } | |
3a391a39 | 2477 | if (device->handler) |
2c22e652 | 2478 | goto ok; |
3a391a39 | 2479 | |
202317a5 | 2480 | if (!device->flags.initialized) { |
1b1f3e16 RW |
2481 | device->flags.power_manageable = |
2482 | device->power.states[ACPI_STATE_D0].flags.valid; | |
2483 | if (acpi_bus_init_power(device)) | |
2484 | device->flags.power_manageable = 0; | |
2485 | ||
202317a5 RW |
2486 | device->flags.initialized = true; |
2487 | } | |
2c22e652 | 2488 | device->flags.visited = false; |
ca589f94 | 2489 | ret = acpi_scan_attach_handler(device); |
6931007c | 2490 | if (ret < 0) |
2c22e652 | 2491 | return; |
6931007c RW |
2492 | |
2493 | device->flags.match_driver = true; | |
2c22e652 RW |
2494 | if (!ret) { |
2495 | ret = device_attach(&device->dev); | |
2496 | if (ret < 0) | |
2497 | return; | |
7d284352 RW |
2498 | |
2499 | if (!ret && device->pnp.type.platform_id) | |
2500 | acpi_default_enumeration(device); | |
2c22e652 | 2501 | } |
202317a5 | 2502 | device->flags.visited = true; |
202317a5 | 2503 | |
2c22e652 RW |
2504 | ok: |
2505 | list_for_each_entry(child, &device->children, node) | |
2506 | acpi_bus_attach(child); | |
8ab17fc9 RW |
2507 | |
2508 | if (device->handler && device->handler->hotplug.notify_online) | |
2509 | device->handler->hotplug.notify_online(device); | |
1da177e4 | 2510 | } |
1da177e4 | 2511 | |
40e7fcb1 LT |
2512 | void acpi_walk_dep_device_list(acpi_handle handle) |
2513 | { | |
2514 | struct acpi_dep_data *dep, *tmp; | |
2515 | struct acpi_device *adev; | |
2516 | ||
2517 | mutex_lock(&acpi_dep_list_lock); | |
2518 | list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) { | |
2519 | if (dep->master == handle) { | |
2520 | acpi_bus_get_device(dep->slave, &adev); | |
2521 | if (!adev) | |
2522 | continue; | |
2523 | ||
2524 | adev->dep_unmet--; | |
2525 | if (!adev->dep_unmet) | |
2526 | acpi_bus_attach(adev); | |
2527 | list_del(&dep->node); | |
2528 | kfree(dep); | |
2529 | } | |
2530 | } | |
2531 | mutex_unlock(&acpi_dep_list_lock); | |
2532 | } | |
2533 | EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list); | |
2534 | ||
636458de | 2535 | /** |
b8bd759a | 2536 | * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. |
636458de | 2537 | * @handle: Root of the namespace scope to scan. |
7779688f | 2538 | * |
636458de RW |
2539 | * Scan a given ACPI tree (probably recently hot-plugged) and create and add |
2540 | * found devices. | |
7779688f | 2541 | * |
636458de RW |
2542 | * If no devices were found, -ENODEV is returned, but it does not mean that |
2543 | * there has been a real error. There just have been no suitable ACPI objects | |
2544 | * in the table trunk from which the kernel could create a device and add an | |
2545 | * appropriate driver. | |
3757b948 RW |
2546 | * |
2547 | * Must be called under acpi_scan_lock. | |
7779688f | 2548 | */ |
b8bd759a | 2549 | int acpi_bus_scan(acpi_handle handle) |
3fb02738 | 2550 | { |
b8bd759a | 2551 | void *device = NULL; |
3fb02738 | 2552 | |
b8bd759a RW |
2553 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device))) |
2554 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
2555 | acpi_bus_check_add, NULL, NULL, &device); | |
3fb02738 | 2556 | |
2c22e652 RW |
2557 | if (device) { |
2558 | acpi_bus_attach(device); | |
2559 | return 0; | |
05404d8f | 2560 | } |
2c22e652 | 2561 | return -ENODEV; |
3fb02738 | 2562 | } |
2c22e652 | 2563 | EXPORT_SYMBOL(acpi_bus_scan); |
1da177e4 | 2564 | |
3757b948 | 2565 | /** |
2c22e652 RW |
2566 | * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects. |
2567 | * @adev: Root of the ACPI namespace scope to walk. | |
3757b948 RW |
2568 | * |
2569 | * Must be called under acpi_scan_lock. | |
2570 | */ | |
2c22e652 | 2571 | void acpi_bus_trim(struct acpi_device *adev) |
1da177e4 | 2572 | { |
2c22e652 RW |
2573 | struct acpi_scan_handler *handler = adev->handler; |
2574 | struct acpi_device *child; | |
2575 | ||
2576 | list_for_each_entry_reverse(child, &adev->children, node) | |
2577 | acpi_bus_trim(child); | |
2578 | ||
a951c773 | 2579 | adev->flags.match_driver = false; |
2c22e652 RW |
2580 | if (handler) { |
2581 | if (handler->detach) | |
2582 | handler->detach(adev); | |
2583 | ||
2584 | adev->handler = NULL; | |
2585 | } else { | |
2586 | device_release_driver(&adev->dev); | |
2587 | } | |
05404d8f | 2588 | /* |
2c22e652 RW |
2589 | * Most likely, the device is going away, so put it into D3cold before |
2590 | * that. | |
05404d8f | 2591 | */ |
2c22e652 RW |
2592 | acpi_device_set_power(adev, ACPI_STATE_D3_COLD); |
2593 | adev->flags.initialized = false; | |
2594 | adev->flags.visited = false; | |
1da177e4 | 2595 | } |
ceaba663 KA |
2596 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
2597 | ||
e8b945c9 | 2598 | static int acpi_bus_scan_fixed(void) |
1da177e4 | 2599 | { |
4be44fcd | 2600 | int result = 0; |
c4168bff | 2601 | |
1da177e4 LT |
2602 | /* |
2603 | * Enumerate all fixed-feature devices. | |
2604 | */ | |
2c0d4fe0 RW |
2605 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { |
2606 | struct acpi_device *device = NULL; | |
2607 | ||
5c478f49 | 2608 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2609 | ACPI_BUS_TYPE_POWER_BUTTON, |
2c0d4fe0 RW |
2610 | ACPI_STA_DEFAULT); |
2611 | if (result) | |
2612 | return result; | |
2613 | ||
88346167 | 2614 | device->flags.match_driver = true; |
2c0d4fe0 RW |
2615 | result = device_attach(&device->dev); |
2616 | if (result < 0) | |
2617 | return result; | |
2618 | ||
c10d7a13 | 2619 | device_init_wakeup(&device->dev, true); |
3fb02738 | 2620 | } |
1da177e4 | 2621 | |
2c0d4fe0 RW |
2622 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { |
2623 | struct acpi_device *device = NULL; | |
2624 | ||
5c478f49 | 2625 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2626 | ACPI_BUS_TYPE_SLEEP_BUTTON, |
2c0d4fe0 RW |
2627 | ACPI_STA_DEFAULT); |
2628 | if (result) | |
2629 | return result; | |
2630 | ||
88346167 | 2631 | device->flags.match_driver = true; |
2c0d4fe0 | 2632 | result = device_attach(&device->dev); |
3fb02738 | 2633 | } |
1da177e4 | 2634 | |
2c0d4fe0 | 2635 | return result < 0 ? result : 0; |
1da177e4 LT |
2636 | } |
2637 | ||
e747f274 | 2638 | int __init acpi_scan_init(void) |
1da177e4 LT |
2639 | { |
2640 | int result; | |
1da177e4 | 2641 | |
5b327265 PM |
2642 | result = bus_register(&acpi_bus_type); |
2643 | if (result) { | |
2644 | /* We don't want to quit even if we failed to add suspend/resume */ | |
2645 | printk(KERN_ERR PREFIX "Could not register bus type\n"); | |
2646 | } | |
2647 | ||
92ef2a25 | 2648 | acpi_pci_root_init(); |
4daeaf68 | 2649 | acpi_pci_link_init(); |
ac212b69 | 2650 | acpi_processor_init(); |
f58b082a | 2651 | acpi_lpss_init(); |
92082a88 | 2652 | acpi_apd_init(); |
2fa97feb | 2653 | acpi_cmos_rtc_init(); |
737f1a9f | 2654 | acpi_container_init(); |
0a347644 | 2655 | acpi_memory_hotplug_init(); |
eec15edb | 2656 | acpi_pnp_init(); |
3230bbfc | 2657 | acpi_int340x_thermal_init(); |
97d9a9e9 | 2658 | |
7d284352 RW |
2659 | acpi_scan_add_handler(&generic_device_handler); |
2660 | ||
3757b948 | 2661 | mutex_lock(&acpi_scan_lock); |
1da177e4 LT |
2662 | /* |
2663 | * Enumerate devices in the ACPI namespace. | |
2664 | */ | |
0cd6ac52 RW |
2665 | result = acpi_bus_scan(ACPI_ROOT_OBJECT); |
2666 | if (result) | |
3757b948 | 2667 | goto out; |
1da177e4 | 2668 | |
0cd6ac52 | 2669 | result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root); |
1da177e4 | 2670 | if (result) |
3757b948 | 2671 | goto out; |
1da177e4 | 2672 | |
2650ef42 AL |
2673 | /* Fixed feature devices do not exist on HW-reduced platform */ |
2674 | if (!acpi_gbl_reduced_hardware) { | |
2675 | result = acpi_bus_scan_fixed(); | |
2676 | if (result) { | |
2677 | acpi_detach_data(acpi_root->handle, | |
2678 | acpi_scan_drop_device); | |
2679 | acpi_device_del(acpi_root); | |
2680 | put_device(&acpi_root->dev); | |
2681 | goto out; | |
2682 | } | |
b8bd759a | 2683 | } |
1da177e4 | 2684 | |
b8bd759a | 2685 | acpi_update_all_gpes(); |
3757b948 RW |
2686 | |
2687 | out: | |
2688 | mutex_unlock(&acpi_scan_lock); | |
2689 | return result; | |
1da177e4 | 2690 | } |