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> |
d0562674 | 14 | #include <linux/dma-mapping.h> |
1da177e4 | 15 | |
d783156e RW |
16 | #include <asm/pgtable.h> |
17 | ||
e60cc7a6 BH |
18 | #include "internal.h" |
19 | ||
1da177e4 | 20 | #define _COMPONENT ACPI_BUS_COMPONENT |
f52fd66d | 21 | ACPI_MODULE_NAME("scan"); |
4be44fcd | 22 | extern struct acpi_device *acpi_root; |
1da177e4 LT |
23 | |
24 | #define ACPI_BUS_CLASS "system_bus" | |
29b71a1c | 25 | #define ACPI_BUS_HID "LNXSYBUS" |
1da177e4 LT |
26 | #define ACPI_BUS_DEVICE_NAME "System Bus" |
27 | ||
859ac9a4 BH |
28 | #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent) |
29 | ||
d783156e RW |
30 | #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page) |
31 | ||
683058e3 RW |
32 | /* |
33 | * If set, devices will be hot-removed even if they cannot be put offline | |
34 | * gracefully (from the kernel's standpoint). | |
35 | */ | |
36 | bool acpi_force_hot_remove; | |
37 | ||
620e112c | 38 | static const char *dummy_hid = "device"; |
2b2ae7c7 | 39 | |
40e7fcb1 LT |
40 | static LIST_HEAD(acpi_dep_list); |
41 | static DEFINE_MUTEX(acpi_dep_list_lock); | |
e49bd2dd | 42 | static LIST_HEAD(acpi_bus_id_list); |
c511cc19 | 43 | static DEFINE_MUTEX(acpi_scan_lock); |
ca589f94 | 44 | static LIST_HEAD(acpi_scan_handlers_list); |
9090589d | 45 | DEFINE_MUTEX(acpi_device_lock); |
1da177e4 | 46 | LIST_HEAD(acpi_wakeup_device_list); |
e525506f | 47 | static DEFINE_MUTEX(acpi_hp_context_lock); |
1da177e4 | 48 | |
40e7fcb1 LT |
49 | struct acpi_dep_data { |
50 | struct list_head node; | |
51 | acpi_handle master; | |
52 | acpi_handle slave; | |
53 | }; | |
54 | ||
e49bd2dd | 55 | struct acpi_device_bus_id{ |
bb095854 | 56 | char bus_id[15]; |
e49bd2dd ZR |
57 | unsigned int instance_no; |
58 | struct list_head node; | |
1da177e4 | 59 | }; |
29b71a1c | 60 | |
3757b948 RW |
61 | void acpi_scan_lock_acquire(void) |
62 | { | |
63 | mutex_lock(&acpi_scan_lock); | |
64 | } | |
65 | EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire); | |
66 | ||
67 | void acpi_scan_lock_release(void) | |
68 | { | |
69 | mutex_unlock(&acpi_scan_lock); | |
70 | } | |
71 | EXPORT_SYMBOL_GPL(acpi_scan_lock_release); | |
72 | ||
e525506f RW |
73 | void acpi_lock_hp_context(void) |
74 | { | |
75 | mutex_lock(&acpi_hp_context_lock); | |
76 | } | |
77 | ||
78 | void acpi_unlock_hp_context(void) | |
79 | { | |
80 | mutex_unlock(&acpi_hp_context_lock); | |
81 | } | |
82 | ||
5d513205 RW |
83 | void acpi_initialize_hp_context(struct acpi_device *adev, |
84 | struct acpi_hotplug_context *hp, | |
85 | int (*notify)(struct acpi_device *, u32), | |
86 | void (*uevent)(struct acpi_device *, u32)) | |
87 | { | |
88 | acpi_lock_hp_context(); | |
ba574dc8 RW |
89 | hp->notify = notify; |
90 | hp->uevent = uevent; | |
91 | acpi_set_hp_context(adev, hp); | |
5d513205 RW |
92 | acpi_unlock_hp_context(); |
93 | } | |
94 | EXPORT_SYMBOL_GPL(acpi_initialize_hp_context); | |
95 | ||
ca589f94 RW |
96 | int acpi_scan_add_handler(struct acpi_scan_handler *handler) |
97 | { | |
d34afa9d | 98 | if (!handler) |
ca589f94 RW |
99 | return -EINVAL; |
100 | ||
101 | list_add_tail(&handler->list_node, &acpi_scan_handlers_list); | |
102 | return 0; | |
103 | } | |
104 | ||
3f8055c3 RW |
105 | int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler, |
106 | const char *hotplug_profile_name) | |
107 | { | |
108 | int error; | |
109 | ||
110 | error = acpi_scan_add_handler(handler); | |
111 | if (error) | |
112 | return error; | |
113 | ||
114 | acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name); | |
115 | return 0; | |
116 | } | |
117 | ||
8765c5ba RW |
118 | /** |
119 | * create_pnp_modalias - Create hid/cid(s) string for modalias and uevent | |
120 | * @acpi_dev: ACPI device object. | |
121 | * @modalias: Buffer to print into. | |
122 | * @size: Size of the buffer. | |
123 | * | |
29b71a1c TR |
124 | * Creates hid/cid(s) string needed for modalias and uevent |
125 | * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get: | |
126 | * char *modalias: "acpi:IBM0001:ACPI0001" | |
3d8e0090 ZR |
127 | * Return: 0: no _HID and no _CID |
128 | * -EINVAL: output error | |
129 | * -ENOMEM: output is truncated | |
29b71a1c | 130 | */ |
8765c5ba RW |
131 | static int create_pnp_modalias(struct acpi_device *acpi_dev, char *modalias, |
132 | int size) | |
b3e572d2 | 133 | { |
29b71a1c | 134 | int len; |
5c9fcb5d | 135 | int count; |
7f47fa6c | 136 | struct acpi_hardware_id *id; |
29b71a1c | 137 | |
733e6251 | 138 | /* |
ee892094 RW |
139 | * Since we skip ACPI_DT_NAMESPACE_HID from the modalias below, 0 should |
140 | * be returned if ACPI_DT_NAMESPACE_HID is the only ACPI/PNP ID in the | |
141 | * device's list. | |
733e6251 | 142 | */ |
8765c5ba RW |
143 | count = 0; |
144 | list_for_each_entry(id, &acpi_dev->pnp.ids, list) | |
ee892094 | 145 | if (strcmp(id->id, ACPI_DT_NAMESPACE_HID)) |
8765c5ba | 146 | count++; |
733e6251 | 147 | |
8765c5ba RW |
148 | if (!count) |
149 | return 0; | |
150 | ||
151 | len = snprintf(modalias, size, "acpi:"); | |
152 | if (len <= 0) | |
153 | return len; | |
154 | ||
155 | size -= len; | |
156 | ||
157 | list_for_each_entry(id, &acpi_dev->pnp.ids, list) { | |
ee892094 | 158 | if (!strcmp(id->id, ACPI_DT_NAMESPACE_HID)) |
8765c5ba RW |
159 | continue; |
160 | ||
161 | count = snprintf(&modalias[len], size, "%s:", id->id); | |
162 | if (count < 0) | |
163 | return -EINVAL; | |
164 | ||
165 | if (count >= size) | |
166 | return -ENOMEM; | |
167 | ||
168 | len += count; | |
169 | size -= count; | |
5c9fcb5d | 170 | } |
8765c5ba RW |
171 | modalias[len] = '\0'; |
172 | return len; | |
173 | } | |
174 | ||
175 | /** | |
176 | * create_of_modalias - Creates DT compatible string for modalias and uevent | |
177 | * @acpi_dev: ACPI device object. | |
178 | * @modalias: Buffer to print into. | |
179 | * @size: Size of the buffer. | |
180 | * | |
181 | * Expose DT compatible modalias as of:NnameTCcompatible. This function should | |
ee892094 RW |
182 | * only be called for devices having ACPI_DT_NAMESPACE_HID in their list of |
183 | * ACPI/PNP IDs. | |
8765c5ba RW |
184 | */ |
185 | static int create_of_modalias(struct acpi_device *acpi_dev, char *modalias, | |
186 | int size) | |
187 | { | |
188 | struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; | |
189 | const union acpi_object *of_compatible, *obj; | |
190 | int len, count; | |
191 | int i, nval; | |
192 | char *c; | |
5c9fcb5d | 193 | |
8765c5ba RW |
194 | acpi_get_name(acpi_dev->handle, ACPI_SINGLE_NAME, &buf); |
195 | /* DT strings are all in lower case */ | |
196 | for (c = buf.pointer; *c != '\0'; c++) | |
197 | *c = tolower(*c); | |
198 | ||
199 | len = snprintf(modalias, size, "of:N%sT", (char *)buf.pointer); | |
200 | ACPI_FREE(buf.pointer); | |
201 | ||
202 | if (len <= 0) | |
203 | return len; | |
204 | ||
205 | of_compatible = acpi_dev->data.of_compatible; | |
206 | if (of_compatible->type == ACPI_TYPE_PACKAGE) { | |
207 | nval = of_compatible->package.count; | |
208 | obj = of_compatible->package.elements; | |
209 | } else { /* Must be ACPI_TYPE_STRING. */ | |
210 | nval = 1; | |
211 | obj = of_compatible; | |
212 | } | |
213 | for (i = 0; i < nval; i++, obj++) { | |
214 | count = snprintf(&modalias[len], size, "C%s", | |
215 | obj->string.pointer); | |
216 | if (count < 0) | |
217 | return -EINVAL; | |
218 | ||
219 | if (count >= size) | |
220 | return -ENOMEM; | |
221 | ||
222 | len += count; | |
223 | size -= count; | |
224 | } | |
29b71a1c TR |
225 | modalias[len] = '\0'; |
226 | return len; | |
227 | } | |
228 | ||
52870786 MW |
229 | /* |
230 | * acpi_companion_match() - Can we match via ACPI companion device | |
231 | * @dev: Device in question | |
232 | * | |
233 | * Check if the given device has an ACPI companion and if that companion has | |
234 | * a valid list of PNP IDs, and if the device is the first (primary) physical | |
e1acdeb0 RW |
235 | * device associated with it. Return the companion pointer if that's the case |
236 | * or NULL otherwise. | |
52870786 MW |
237 | * |
238 | * If multiple physical devices are attached to a single ACPI companion, we need | |
239 | * to be careful. The usage scenario for this kind of relationship is that all | |
240 | * of the physical devices in question use resources provided by the ACPI | |
241 | * companion. A typical case is an MFD device where all the sub-devices share | |
242 | * the parent's ACPI companion. In such cases we can only allow the primary | |
243 | * (first) physical device to be matched with the help of the companion's PNP | |
244 | * IDs. | |
245 | * | |
246 | * Additional physical devices sharing the ACPI companion can still use | |
247 | * resources available from it but they will be matched normally using functions | |
248 | * provided by their bus types (and analogously for their modalias). | |
249 | */ | |
e1acdeb0 | 250 | static struct acpi_device *acpi_companion_match(const struct device *dev) |
52870786 MW |
251 | { |
252 | struct acpi_device *adev; | |
5f2e3274 | 253 | struct mutex *physical_node_lock; |
52870786 MW |
254 | |
255 | adev = ACPI_COMPANION(dev); | |
256 | if (!adev) | |
e1acdeb0 | 257 | return NULL; |
52870786 MW |
258 | |
259 | if (list_empty(&adev->pnp.ids)) | |
e1acdeb0 | 260 | return NULL; |
52870786 | 261 | |
5f2e3274 RW |
262 | physical_node_lock = &adev->physical_node_lock; |
263 | mutex_lock(physical_node_lock); | |
52870786 | 264 | if (list_empty(&adev->physical_node_list)) { |
e1acdeb0 | 265 | adev = NULL; |
52870786 MW |
266 | } else { |
267 | const struct acpi_device_physical_node *node; | |
268 | ||
269 | node = list_first_entry(&adev->physical_node_list, | |
270 | struct acpi_device_physical_node, node); | |
e1acdeb0 RW |
271 | if (node->dev != dev) |
272 | adev = NULL; | |
52870786 | 273 | } |
5f2e3274 | 274 | mutex_unlock(physical_node_lock); |
52870786 | 275 | |
e1acdeb0 | 276 | return adev; |
52870786 MW |
277 | } |
278 | ||
8765c5ba RW |
279 | static int __acpi_device_uevent_modalias(struct acpi_device *adev, |
280 | struct kobj_uevent_env *env) | |
6eb2451f | 281 | { |
6eb2451f ZR |
282 | int len; |
283 | ||
8765c5ba | 284 | if (!adev) |
6eb2451f ZR |
285 | return -ENODEV; |
286 | ||
8765c5ba RW |
287 | if (list_empty(&adev->pnp.ids)) |
288 | return 0; | |
289 | ||
6eb2451f ZR |
290 | if (add_uevent_var(env, "MODALIAS=")) |
291 | return -ENOMEM; | |
8765c5ba RW |
292 | |
293 | len = create_pnp_modalias(adev, &env->buf[env->buflen - 1], | |
294 | sizeof(env->buf) - env->buflen); | |
295 | if (len < 0) | |
6eb2451f | 296 | return len; |
8765c5ba RW |
297 | |
298 | env->buflen += len; | |
299 | if (!adev->data.of_compatible) | |
300 | return 0; | |
301 | ||
302 | if (len > 0 && add_uevent_var(env, "MODALIAS=")) | |
303 | return -ENOMEM; | |
304 | ||
305 | len = create_of_modalias(adev, &env->buf[env->buflen - 1], | |
306 | sizeof(env->buf) - env->buflen); | |
307 | if (len < 0) | |
308 | return len; | |
309 | ||
6eb2451f | 310 | env->buflen += len; |
8765c5ba | 311 | |
6eb2451f ZR |
312 | return 0; |
313 | } | |
6eb2451f ZR |
314 | |
315 | /* | |
8765c5ba | 316 | * Creates uevent modalias field for ACPI enumerated devices. |
6eb2451f ZR |
317 | * Because the other buses does not support ACPI HIDs & CIDs. |
318 | * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get: | |
319 | * "acpi:IBM0001:ACPI0001" | |
320 | */ | |
8765c5ba | 321 | int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env) |
6eb2451f | 322 | { |
8765c5ba RW |
323 | return __acpi_device_uevent_modalias(acpi_companion_match(dev), env); |
324 | } | |
325 | EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias); | |
326 | ||
327 | static int __acpi_device_modalias(struct acpi_device *adev, char *buf, int size) | |
328 | { | |
329 | int len, count; | |
6eb2451f | 330 | |
8765c5ba | 331 | if (!adev) |
6eb2451f ZR |
332 | return -ENODEV; |
333 | ||
8765c5ba RW |
334 | if (list_empty(&adev->pnp.ids)) |
335 | return 0; | |
336 | ||
337 | len = create_pnp_modalias(adev, buf, size - 1); | |
338 | if (len < 0) { | |
6eb2451f | 339 | return len; |
8765c5ba RW |
340 | } else if (len > 0) { |
341 | buf[len++] = '\n'; | |
342 | size -= len; | |
343 | } | |
344 | if (!adev->data.of_compatible) | |
345 | return len; | |
346 | ||
347 | count = create_of_modalias(adev, buf + len, size - 1); | |
348 | if (count < 0) { | |
349 | return count; | |
350 | } else if (count > 0) { | |
351 | len += count; | |
352 | buf[len++] = '\n'; | |
353 | } | |
354 | ||
6eb2451f ZR |
355 | return len; |
356 | } | |
8765c5ba RW |
357 | |
358 | /* | |
359 | * Creates modalias sysfs attribute for ACPI enumerated devices. | |
360 | * Because the other buses does not support ACPI HIDs & CIDs. | |
361 | * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get: | |
362 | * "acpi:IBM0001:ACPI0001" | |
363 | */ | |
364 | int acpi_device_modalias(struct device *dev, char *buf, int size) | |
365 | { | |
366 | return __acpi_device_modalias(acpi_companion_match(dev), buf, size); | |
367 | } | |
6eb2451f ZR |
368 | EXPORT_SYMBOL_GPL(acpi_device_modalias); |
369 | ||
29b71a1c TR |
370 | static ssize_t |
371 | acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
8765c5ba | 372 | return __acpi_device_modalias(to_acpi_device(dev), buf, 1024); |
29b71a1c TR |
373 | } |
374 | static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL); | |
375 | ||
caa73ea1 | 376 | bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent) |
d22ddcbc RW |
377 | { |
378 | struct acpi_device_physical_node *pn; | |
379 | bool offline = true; | |
380 | ||
4c533c80 RW |
381 | /* |
382 | * acpi_container_offline() calls this for all of the container's | |
383 | * children under the container's physical_node_lock lock. | |
384 | */ | |
385 | mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING); | |
d22ddcbc RW |
386 | |
387 | list_for_each_entry(pn, &adev->physical_node_list, node) | |
388 | if (device_supports_offline(pn->dev) && !pn->dev->offline) { | |
caa73ea1 RW |
389 | if (uevent) |
390 | kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE); | |
391 | ||
d22ddcbc RW |
392 | offline = false; |
393 | break; | |
394 | } | |
395 | ||
396 | mutex_unlock(&adev->physical_node_lock); | |
397 | return offline; | |
398 | } | |
399 | ||
7f28ddec RW |
400 | static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data, |
401 | void **ret_p) | |
683058e3 RW |
402 | { |
403 | struct acpi_device *device = NULL; | |
404 | struct acpi_device_physical_node *pn; | |
303bfdb1 | 405 | bool second_pass = (bool)data; |
683058e3 RW |
406 | acpi_status status = AE_OK; |
407 | ||
408 | if (acpi_bus_get_device(handle, &device)) | |
409 | return AE_OK; | |
410 | ||
7f28ddec RW |
411 | if (device->handler && !device->handler->hotplug.enabled) { |
412 | *ret_p = &device->dev; | |
413 | return AE_SUPPORT; | |
414 | } | |
415 | ||
683058e3 RW |
416 | mutex_lock(&device->physical_node_lock); |
417 | ||
418 | list_for_each_entry(pn, &device->physical_node_list, node) { | |
419 | int ret; | |
420 | ||
303bfdb1 RW |
421 | if (second_pass) { |
422 | /* Skip devices offlined by the first pass. */ | |
423 | if (pn->put_online) | |
424 | continue; | |
425 | } else { | |
426 | pn->put_online = false; | |
427 | } | |
683058e3 RW |
428 | ret = device_offline(pn->dev); |
429 | if (acpi_force_hot_remove) | |
430 | continue; | |
431 | ||
303bfdb1 RW |
432 | if (ret >= 0) { |
433 | pn->put_online = !ret; | |
434 | } else { | |
435 | *ret_p = pn->dev; | |
436 | if (second_pass) { | |
437 | status = AE_ERROR; | |
438 | break; | |
439 | } | |
683058e3 | 440 | } |
683058e3 RW |
441 | } |
442 | ||
443 | mutex_unlock(&device->physical_node_lock); | |
444 | ||
445 | return status; | |
446 | } | |
447 | ||
7f28ddec RW |
448 | static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data, |
449 | void **ret_p) | |
683058e3 RW |
450 | { |
451 | struct acpi_device *device = NULL; | |
452 | struct acpi_device_physical_node *pn; | |
453 | ||
454 | if (acpi_bus_get_device(handle, &device)) | |
455 | return AE_OK; | |
456 | ||
457 | mutex_lock(&device->physical_node_lock); | |
458 | ||
459 | list_for_each_entry(pn, &device->physical_node_list, node) | |
460 | if (pn->put_online) { | |
461 | device_online(pn->dev); | |
462 | pn->put_online = false; | |
463 | } | |
464 | ||
465 | mutex_unlock(&device->physical_node_lock); | |
466 | ||
467 | return AE_OK; | |
468 | } | |
469 | ||
d22ddcbc | 470 | static int acpi_scan_try_to_offline(struct acpi_device *device) |
1da177e4 | 471 | { |
5993c467 | 472 | acpi_handle handle = device->handle; |
d22ddcbc | 473 | struct device *errdev = NULL; |
a33ec399 | 474 | acpi_status status; |
f058cdf4 | 475 | |
303bfdb1 RW |
476 | /* |
477 | * Carry out two passes here and ignore errors in the first pass, | |
478 | * because if the devices in question are memory blocks and | |
479 | * CONFIG_MEMCG is set, one of the blocks may hold data structures | |
480 | * that the other blocks depend on, but it is not known in advance which | |
481 | * block holds them. | |
482 | * | |
483 | * If the first pass is successful, the second one isn't needed, though. | |
484 | */ | |
7f28ddec RW |
485 | status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
486 | NULL, acpi_bus_offline, (void *)false, | |
487 | (void **)&errdev); | |
488 | if (status == AE_SUPPORT) { | |
489 | dev_warn(errdev, "Offline disabled.\n"); | |
490 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
491 | acpi_bus_online, NULL, NULL, NULL); | |
7f28ddec RW |
492 | return -EPERM; |
493 | } | |
494 | acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev); | |
303bfdb1 RW |
495 | if (errdev) { |
496 | errdev = NULL; | |
683058e3 | 497 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
7f28ddec RW |
498 | NULL, acpi_bus_offline, (void *)true, |
499 | (void **)&errdev); | |
303bfdb1 | 500 | if (!errdev || acpi_force_hot_remove) |
7f28ddec RW |
501 | acpi_bus_offline(handle, 0, (void *)true, |
502 | (void **)&errdev); | |
303bfdb1 RW |
503 | |
504 | if (errdev && !acpi_force_hot_remove) { | |
505 | dev_warn(errdev, "Offline failed.\n"); | |
7f28ddec | 506 | acpi_bus_online(handle, 0, NULL, NULL); |
303bfdb1 | 507 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, |
7f28ddec RW |
508 | ACPI_UINT32_MAX, acpi_bus_online, |
509 | NULL, NULL, NULL); | |
303bfdb1 RW |
510 | return -EBUSY; |
511 | } | |
683058e3 | 512 | } |
d22ddcbc RW |
513 | return 0; |
514 | } | |
515 | ||
516 | static int acpi_scan_hot_remove(struct acpi_device *device) | |
517 | { | |
518 | acpi_handle handle = device->handle; | |
519 | unsigned long long sta; | |
520 | acpi_status status; | |
521 | ||
dee15926 TC |
522 | if (device->handler && device->handler->hotplug.demand_offline |
523 | && !acpi_force_hot_remove) { | |
caa73ea1 | 524 | if (!acpi_scan_is_offline(device, true)) |
d22ddcbc RW |
525 | return -EBUSY; |
526 | } else { | |
527 | int error = acpi_scan_try_to_offline(device); | |
528 | if (error) | |
529 | return error; | |
530 | } | |
683058e3 | 531 | |
26d46867 | 532 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
0794469d | 533 | "Hot-removing device %s...\n", dev_name(&device->dev))); |
26d46867 | 534 | |
bfee26db | 535 | acpi_bus_trim(device); |
683058e3 | 536 | |
7d2421f8 | 537 | acpi_evaluate_lck(handle, 0); |
1da177e4 LT |
538 | /* |
539 | * TBD: _EJD support. | |
540 | */ | |
7d2421f8 JL |
541 | status = acpi_evaluate_ej0(handle); |
542 | if (status == AE_NOT_FOUND) | |
543 | return -ENODEV; | |
544 | else if (ACPI_FAILURE(status)) | |
545 | return -EIO; | |
1da177e4 | 546 | |
882fd12e TK |
547 | /* |
548 | * Verify if eject was indeed successful. If not, log an error | |
549 | * message. No need to call _OST since _EJ0 call was made OK. | |
550 | */ | |
551 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
552 | if (ACPI_FAILURE(status)) { | |
553 | acpi_handle_warn(handle, | |
554 | "Status check after eject failed (0x%x)\n", status); | |
555 | } else if (sta & ACPI_STA_DEVICE_ENABLED) { | |
556 | acpi_handle_warn(handle, | |
557 | "Eject incomplete - status 0x%llx\n", sta); | |
558 | } | |
559 | ||
a33ec399 RW |
560 | return 0; |
561 | } | |
1da177e4 | 562 | |
443fc820 RW |
563 | static int acpi_scan_device_not_present(struct acpi_device *adev) |
564 | { | |
565 | if (!acpi_device_enumerated(adev)) { | |
566 | dev_warn(&adev->dev, "Still not present\n"); | |
567 | return -EALREADY; | |
568 | } | |
569 | acpi_bus_trim(adev); | |
570 | return 0; | |
571 | } | |
572 | ||
c27b2c33 | 573 | static int acpi_scan_device_check(struct acpi_device *adev) |
a33ec399 | 574 | { |
f943db40 | 575 | int error; |
a33ec399 | 576 | |
443fc820 RW |
577 | acpi_bus_get_status(adev); |
578 | if (adev->status.present || adev->status.functional) { | |
579 | /* | |
580 | * This function is only called for device objects for which | |
581 | * matching scan handlers exist. The only situation in which | |
582 | * the scan handler is not attached to this device object yet | |
583 | * is when the device has just appeared (either it wasn't | |
584 | * present at all before or it was removed and then added | |
585 | * again). | |
586 | */ | |
587 | if (adev->handler) { | |
588 | dev_warn(&adev->dev, "Already enumerated\n"); | |
589 | return -EALREADY; | |
590 | } | |
591 | error = acpi_bus_scan(adev->handle); | |
592 | if (error) { | |
593 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
594 | return error; | |
595 | } | |
596 | if (!adev->handler) { | |
597 | dev_warn(&adev->dev, "Enumeration failure\n"); | |
598 | error = -ENODEV; | |
599 | } | |
600 | } else { | |
601 | error = acpi_scan_device_not_present(adev); | |
602 | } | |
603 | return error; | |
604 | } | |
605 | ||
606 | static int acpi_scan_bus_check(struct acpi_device *adev) | |
607 | { | |
608 | struct acpi_scan_handler *handler = adev->handler; | |
609 | struct acpi_device *child; | |
610 | int error; | |
611 | ||
612 | acpi_bus_get_status(adev); | |
613 | if (!(adev->status.present || adev->status.functional)) { | |
614 | acpi_scan_device_not_present(adev); | |
615 | return 0; | |
616 | } | |
617 | if (handler && handler->hotplug.scan_dependent) | |
618 | return handler->hotplug.scan_dependent(adev); | |
619 | ||
c27b2c33 RW |
620 | error = acpi_bus_scan(adev->handle); |
621 | if (error) { | |
622 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
623 | return error; | |
624 | } | |
443fc820 RW |
625 | list_for_each_entry(child, &adev->children, node) { |
626 | error = acpi_scan_bus_check(child); | |
627 | if (error) | |
628 | return error; | |
c27b2c33 RW |
629 | } |
630 | return 0; | |
a33ec399 RW |
631 | } |
632 | ||
3c2cc7ff RW |
633 | static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type) |
634 | { | |
635 | switch (type) { | |
636 | case ACPI_NOTIFY_BUS_CHECK: | |
637 | return acpi_scan_bus_check(adev); | |
638 | case ACPI_NOTIFY_DEVICE_CHECK: | |
639 | return acpi_scan_device_check(adev); | |
640 | case ACPI_NOTIFY_EJECT_REQUEST: | |
641 | case ACPI_OST_EC_OSPM_EJECT: | |
dd2151be RW |
642 | if (adev->handler && !adev->handler->hotplug.enabled) { |
643 | dev_info(&adev->dev, "Eject disabled\n"); | |
644 | return -EPERM; | |
645 | } | |
700b8422 RW |
646 | acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST, |
647 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); | |
3c2cc7ff RW |
648 | return acpi_scan_hot_remove(adev); |
649 | } | |
650 | return -EINVAL; | |
651 | } | |
652 | ||
1e3bcb59 | 653 | void acpi_device_hotplug(struct acpi_device *adev, u32 src) |
a33ec399 | 654 | { |
a33ec399 | 655 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
3c2cc7ff | 656 | int error = -ENODEV; |
a33ec399 | 657 | |
683058e3 | 658 | lock_device_hotplug(); |
e0ae8fee | 659 | mutex_lock(&acpi_scan_lock); |
a33ec399 | 660 | |
c27b2c33 RW |
661 | /* |
662 | * The device object's ACPI handle cannot become invalid as long as we | |
3c2cc7ff | 663 | * are holding acpi_scan_lock, but it might have become invalid before |
c27b2c33 RW |
664 | * that lock was acquired. |
665 | */ | |
666 | if (adev->handle == INVALID_ACPI_HANDLE) | |
3c2cc7ff | 667 | goto err_out; |
c27b2c33 | 668 | |
1e2380cd RW |
669 | if (adev->flags.is_dock_station) { |
670 | error = dock_notify(adev, src); | |
671 | } else if (adev->flags.hotplug_notify) { | |
3c2cc7ff | 672 | error = acpi_generic_hotplug_event(adev, src); |
dd2151be RW |
673 | if (error == -EPERM) { |
674 | ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; | |
675 | goto err_out; | |
676 | } | |
3c2cc7ff | 677 | } else { |
be27b3dc | 678 | int (*notify)(struct acpi_device *, u32); |
3c2cc7ff RW |
679 | |
680 | acpi_lock_hp_context(); | |
be27b3dc | 681 | notify = adev->hp ? adev->hp->notify : NULL; |
3c2cc7ff RW |
682 | acpi_unlock_hp_context(); |
683 | /* | |
684 | * There may be additional notify handlers for device objects | |
685 | * without the .event() callback, so ignore them here. | |
686 | */ | |
be27b3dc RW |
687 | if (notify) |
688 | error = notify(adev, src); | |
3c2cc7ff RW |
689 | else |
690 | goto out; | |
a33ec399 | 691 | } |
c27b2c33 RW |
692 | if (!error) |
693 | ost_code = ACPI_OST_SC_SUCCESS; | |
a33ec399 | 694 | |
3c2cc7ff | 695 | err_out: |
700b8422 | 696 | acpi_evaluate_ost(adev->handle, src, ost_code, NULL); |
3c2cc7ff RW |
697 | |
698 | out: | |
78ea4639 | 699 | acpi_bus_put_acpi_device(adev); |
a33ec399 | 700 | mutex_unlock(&acpi_scan_lock); |
e0ae8fee | 701 | unlock_device_hotplug(); |
a33ec399 RW |
702 | } |
703 | ||
836aedb1 RW |
704 | static ssize_t real_power_state_show(struct device *dev, |
705 | struct device_attribute *attr, char *buf) | |
706 | { | |
707 | struct acpi_device *adev = to_acpi_device(dev); | |
708 | int state; | |
709 | int ret; | |
710 | ||
711 | ret = acpi_device_get_power(adev, &state); | |
712 | if (ret) | |
713 | return ret; | |
714 | ||
715 | return sprintf(buf, "%s\n", acpi_power_state_string(state)); | |
716 | } | |
717 | ||
718 | static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL); | |
719 | ||
720 | static ssize_t power_state_show(struct device *dev, | |
721 | struct device_attribute *attr, char *buf) | |
722 | { | |
723 | struct acpi_device *adev = to_acpi_device(dev); | |
724 | ||
725 | return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state)); | |
726 | } | |
727 | ||
728 | static DEVICE_ATTR(power_state, 0444, power_state_show, NULL); | |
729 | ||
1da177e4 | 730 | static ssize_t |
f883d9db PM |
731 | acpi_eject_store(struct device *d, struct device_attribute *attr, |
732 | const char *buf, size_t count) | |
1da177e4 | 733 | { |
f883d9db | 734 | struct acpi_device *acpi_device = to_acpi_device(d); |
a33ec399 RW |
735 | acpi_object_type not_used; |
736 | acpi_status status; | |
1da177e4 | 737 | |
a33ec399 | 738 | if (!count || buf[0] != '1') |
1da177e4 | 739 | return -EINVAL; |
1da177e4 | 740 | |
a33ec399 RW |
741 | if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled) |
742 | && !acpi_device->driver) | |
743 | return -ENODEV; | |
744 | ||
745 | status = acpi_get_type(acpi_device->handle, ¬_used); | |
746 | if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable) | |
747 | return -ENODEV; | |
748 | ||
a33ec399 | 749 | get_device(&acpi_device->dev); |
1e3bcb59 | 750 | status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT); |
f943db40 RW |
751 | if (ACPI_SUCCESS(status)) |
752 | return count; | |
a33ec399 | 753 | |
f943db40 | 754 | put_device(&acpi_device->dev); |
700b8422 RW |
755 | acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, |
756 | ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); | |
5add99cf | 757 | return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN; |
1da177e4 LT |
758 | } |
759 | ||
f883d9db | 760 | static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); |
1da177e4 | 761 | |
e49bd2dd ZR |
762 | static ssize_t |
763 | acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
764 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
1da177e4 | 765 | |
ea8d82fd | 766 | return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev)); |
1da177e4 | 767 | } |
e49bd2dd | 768 | static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL); |
1da177e4 | 769 | |
923d4a45 LZ |
770 | static ssize_t acpi_device_uid_show(struct device *dev, |
771 | struct device_attribute *attr, char *buf) | |
772 | { | |
773 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
774 | ||
775 | return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id); | |
776 | } | |
777 | static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL); | |
778 | ||
779 | static ssize_t acpi_device_adr_show(struct device *dev, | |
780 | struct device_attribute *attr, char *buf) | |
781 | { | |
782 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
783 | ||
784 | return sprintf(buf, "0x%08x\n", | |
785 | (unsigned int)(acpi_dev->pnp.bus_address)); | |
786 | } | |
787 | static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL); | |
788 | ||
e49bd2dd ZR |
789 | static ssize_t |
790 | acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
791 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
792 | struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; | |
793 | int result; | |
1da177e4 | 794 | |
e49bd2dd | 795 | result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path); |
0c526d96 | 796 | if (result) |
e49bd2dd | 797 | goto end; |
1da177e4 | 798 | |
e49bd2dd ZR |
799 | result = sprintf(buf, "%s\n", (char*)path.pointer); |
800 | kfree(path.pointer); | |
0c526d96 | 801 | end: |
e49bd2dd | 802 | return result; |
1da177e4 | 803 | } |
e49bd2dd | 804 | static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL); |
1da177e4 | 805 | |
d1efe3c3 LO |
806 | /* sysfs file that shows description text from the ACPI _STR method */ |
807 | static ssize_t description_show(struct device *dev, | |
808 | struct device_attribute *attr, | |
809 | char *buf) { | |
810 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
811 | int result; | |
812 | ||
813 | if (acpi_dev->pnp.str_obj == NULL) | |
814 | return 0; | |
815 | ||
816 | /* | |
817 | * The _STR object contains a Unicode identifier for a device. | |
818 | * We need to convert to utf-8 so it can be displayed. | |
819 | */ | |
820 | result = utf16s_to_utf8s( | |
821 | (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer, | |
822 | acpi_dev->pnp.str_obj->buffer.length, | |
823 | UTF16_LITTLE_ENDIAN, buf, | |
824 | PAGE_SIZE); | |
825 | ||
826 | buf[result++] = '\n'; | |
827 | ||
828 | return result; | |
829 | } | |
830 | static DEVICE_ATTR(description, 0444, description_show, NULL); | |
831 | ||
bb74ac23 YI |
832 | static ssize_t |
833 | acpi_device_sun_show(struct device *dev, struct device_attribute *attr, | |
834 | char *buf) { | |
835 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
a383b68d YI |
836 | acpi_status status; |
837 | unsigned long long sun; | |
bb74ac23 | 838 | |
a383b68d YI |
839 | status = acpi_evaluate_integer(acpi_dev->handle, "_SUN", NULL, &sun); |
840 | if (ACPI_FAILURE(status)) | |
841 | return -ENODEV; | |
842 | ||
843 | return sprintf(buf, "%llu\n", sun); | |
bb74ac23 YI |
844 | } |
845 | static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL); | |
846 | ||
c713cd7f SP |
847 | static ssize_t status_show(struct device *dev, struct device_attribute *attr, |
848 | char *buf) { | |
849 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
850 | acpi_status status; | |
851 | unsigned long long sta; | |
852 | ||
853 | status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta); | |
854 | if (ACPI_FAILURE(status)) | |
855 | return -ENODEV; | |
856 | ||
857 | return sprintf(buf, "%llu\n", sta); | |
858 | } | |
859 | static DEVICE_ATTR_RO(status); | |
860 | ||
e49bd2dd | 861 | static int acpi_device_setup_files(struct acpi_device *dev) |
1da177e4 | 862 | { |
d1efe3c3 | 863 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
f883d9db | 864 | acpi_status status; |
e49bd2dd | 865 | int result = 0; |
1da177e4 LT |
866 | |
867 | /* | |
e49bd2dd | 868 | * Devices gotten from FADT don't have a "path" attribute |
1da177e4 | 869 | */ |
0c526d96 | 870 | if (dev->handle) { |
e49bd2dd | 871 | result = device_create_file(&dev->dev, &dev_attr_path); |
0c526d96 | 872 | if (result) |
e49bd2dd | 873 | goto end; |
1da177e4 LT |
874 | } |
875 | ||
2b2ae7c7 TR |
876 | if (!list_empty(&dev->pnp.ids)) { |
877 | result = device_create_file(&dev->dev, &dev_attr_hid); | |
878 | if (result) | |
879 | goto end; | |
1da177e4 | 880 | |
2b2ae7c7 TR |
881 | result = device_create_file(&dev->dev, &dev_attr_modalias); |
882 | if (result) | |
883 | goto end; | |
884 | } | |
29b71a1c | 885 | |
d1efe3c3 LO |
886 | /* |
887 | * If device has _STR, 'description' file is created | |
888 | */ | |
952c63e9 | 889 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
890 | status = acpi_evaluate_object(dev->handle, "_STR", |
891 | NULL, &buffer); | |
892 | if (ACPI_FAILURE(status)) | |
893 | buffer.pointer = NULL; | |
894 | dev->pnp.str_obj = buffer.pointer; | |
895 | result = device_create_file(&dev->dev, &dev_attr_description); | |
896 | if (result) | |
897 | goto end; | |
898 | } | |
899 | ||
d4e1a692 | 900 | if (dev->pnp.type.bus_address) |
923d4a45 LZ |
901 | result = device_create_file(&dev->dev, &dev_attr_adr); |
902 | if (dev->pnp.unique_id) | |
903 | result = device_create_file(&dev->dev, &dev_attr_uid); | |
904 | ||
a383b68d | 905 | if (acpi_has_method(dev->handle, "_SUN")) { |
bb74ac23 YI |
906 | result = device_create_file(&dev->dev, &dev_attr_sun); |
907 | if (result) | |
908 | goto end; | |
bb74ac23 YI |
909 | } |
910 | ||
c713cd7f SP |
911 | if (acpi_has_method(dev->handle, "_STA")) { |
912 | result = device_create_file(&dev->dev, &dev_attr_status); | |
913 | if (result) | |
914 | goto end; | |
915 | } | |
916 | ||
e49bd2dd ZR |
917 | /* |
918 | * If device has _EJ0, 'eject' file is created that is used to trigger | |
919 | * hot-removal function from userland. | |
920 | */ | |
952c63e9 | 921 | if (acpi_has_method(dev->handle, "_EJ0")) { |
e49bd2dd | 922 | result = device_create_file(&dev->dev, &dev_attr_eject); |
836aedb1 RW |
923 | if (result) |
924 | return result; | |
925 | } | |
926 | ||
927 | if (dev->flags.power_manageable) { | |
928 | result = device_create_file(&dev->dev, &dev_attr_power_state); | |
929 | if (result) | |
930 | return result; | |
931 | ||
932 | if (dev->power.flags.power_resources) | |
933 | result = device_create_file(&dev->dev, | |
934 | &dev_attr_real_power_state); | |
935 | } | |
936 | ||
0c526d96 | 937 | end: |
e49bd2dd | 938 | return result; |
1da177e4 LT |
939 | } |
940 | ||
f883d9db | 941 | static void acpi_device_remove_files(struct acpi_device *dev) |
1da177e4 | 942 | { |
836aedb1 RW |
943 | if (dev->flags.power_manageable) { |
944 | device_remove_file(&dev->dev, &dev_attr_power_state); | |
945 | if (dev->power.flags.power_resources) | |
946 | device_remove_file(&dev->dev, | |
947 | &dev_attr_real_power_state); | |
948 | } | |
949 | ||
f883d9db | 950 | /* |
d1efe3c3 LO |
951 | * If device has _STR, remove 'description' file |
952 | */ | |
952c63e9 | 953 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
954 | kfree(dev->pnp.str_obj); |
955 | device_remove_file(&dev->dev, &dev_attr_description); | |
956 | } | |
957 | /* | |
958 | * If device has _EJ0, remove 'eject' file. | |
f883d9db | 959 | */ |
952c63e9 | 960 | if (acpi_has_method(dev->handle, "_EJ0")) |
f883d9db | 961 | device_remove_file(&dev->dev, &dev_attr_eject); |
1da177e4 | 962 | |
952c63e9 | 963 | if (acpi_has_method(dev->handle, "_SUN")) |
bb74ac23 YI |
964 | device_remove_file(&dev->dev, &dev_attr_sun); |
965 | ||
923d4a45 LZ |
966 | if (dev->pnp.unique_id) |
967 | device_remove_file(&dev->dev, &dev_attr_uid); | |
d4e1a692 | 968 | if (dev->pnp.type.bus_address) |
923d4a45 | 969 | device_remove_file(&dev->dev, &dev_attr_adr); |
1131b938 BH |
970 | device_remove_file(&dev->dev, &dev_attr_modalias); |
971 | device_remove_file(&dev->dev, &dev_attr_hid); | |
c713cd7f SP |
972 | if (acpi_has_method(dev->handle, "_STA")) |
973 | device_remove_file(&dev->dev, &dev_attr_status); | |
0c526d96 | 974 | if (dev->handle) |
e49bd2dd | 975 | device_remove_file(&dev->dev, &dev_attr_path); |
1da177e4 | 976 | } |
1da177e4 | 977 | /* -------------------------------------------------------------------------- |
9e89dde2 | 978 | ACPI Bus operations |
1da177e4 | 979 | -------------------------------------------------------------------------- */ |
29b71a1c | 980 | |
2b9c698e RW |
981 | /** |
982 | * acpi_of_match_device - Match device object using the "compatible" property. | |
983 | * @adev: ACPI device object to match. | |
984 | * @of_match_table: List of device IDs to match against. | |
985 | * | |
ee892094 RW |
986 | * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of |
987 | * identifiers and a _DSD object with the "compatible" property, use that | |
988 | * property to match against the given list of identifiers. | |
2b9c698e RW |
989 | */ |
990 | static bool acpi_of_match_device(struct acpi_device *adev, | |
991 | const struct of_device_id *of_match_table) | |
992 | { | |
993 | const union acpi_object *of_compatible, *obj; | |
994 | int i, nval; | |
995 | ||
996 | if (!adev) | |
997 | return false; | |
998 | ||
999 | of_compatible = adev->data.of_compatible; | |
1000 | if (!of_match_table || !of_compatible) | |
1001 | return false; | |
1002 | ||
1003 | if (of_compatible->type == ACPI_TYPE_PACKAGE) { | |
1004 | nval = of_compatible->package.count; | |
1005 | obj = of_compatible->package.elements; | |
1006 | } else { /* Must be ACPI_TYPE_STRING. */ | |
1007 | nval = 1; | |
1008 | obj = of_compatible; | |
1009 | } | |
1010 | /* Now we can look for the driver DT compatible strings */ | |
1011 | for (i = 0; i < nval; i++, obj++) { | |
1012 | const struct of_device_id *id; | |
1013 | ||
1014 | for (id = of_match_table; id->compatible[0]; id++) | |
1015 | if (!strcasecmp(obj->string.pointer, id->compatible)) | |
1016 | return true; | |
1017 | } | |
1018 | ||
1019 | return false; | |
1020 | } | |
1021 | ||
cf761af9 | 1022 | static const struct acpi_device_id *__acpi_match_device( |
2b9c698e RW |
1023 | struct acpi_device *device, |
1024 | const struct acpi_device_id *ids, | |
1025 | const struct of_device_id *of_ids) | |
29b71a1c TR |
1026 | { |
1027 | const struct acpi_device_id *id; | |
7f47fa6c | 1028 | struct acpi_hardware_id *hwid; |
29b71a1c | 1029 | |
39a0ad87 ZY |
1030 | /* |
1031 | * If the device is not present, it is unnecessary to load device | |
1032 | * driver for it. | |
1033 | */ | |
e1acdeb0 | 1034 | if (!device || !device->status.present) |
cf761af9 | 1035 | return NULL; |
39a0ad87 | 1036 | |
2b9c698e RW |
1037 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
1038 | /* First, check the ACPI/PNP IDs provided by the caller. */ | |
1039 | for (id = ids; id->id[0]; id++) | |
7f47fa6c | 1040 | if (!strcmp((char *) id->id, hwid->id)) |
cf761af9 MW |
1041 | return id; |
1042 | ||
2b9c698e | 1043 | /* |
ee892094 | 1044 | * Next, check ACPI_DT_NAMESPACE_HID and try to match the |
2b9c698e RW |
1045 | * "compatible" property if found. |
1046 | * | |
1047 | * The id returned by the below is not valid, but the only | |
1048 | * caller passing non-NULL of_ids here is only interested in | |
1049 | * whether or not the return value is NULL. | |
1050 | */ | |
ee892094 | 1051 | if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id) |
2b9c698e RW |
1052 | && acpi_of_match_device(device, of_ids)) |
1053 | return id; | |
1054 | } | |
cf761af9 MW |
1055 | return NULL; |
1056 | } | |
1057 | ||
1058 | /** | |
1059 | * acpi_match_device - Match a struct device against a given list of ACPI IDs | |
1060 | * @ids: Array of struct acpi_device_id object to match against. | |
1061 | * @dev: The device structure to match. | |
1062 | * | |
1063 | * Check if @dev has a valid ACPI handle and if there is a struct acpi_device | |
1064 | * object for that handle and use that object to match against a given list of | |
1065 | * device IDs. | |
1066 | * | |
1067 | * Return a pointer to the first matching ID on success or %NULL on failure. | |
1068 | */ | |
1069 | const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, | |
1070 | const struct device *dev) | |
1071 | { | |
2b9c698e | 1072 | return __acpi_match_device(acpi_companion_match(dev), ids, NULL); |
cf761af9 MW |
1073 | } |
1074 | EXPORT_SYMBOL_GPL(acpi_match_device); | |
29b71a1c | 1075 | |
cf761af9 MW |
1076 | int acpi_match_device_ids(struct acpi_device *device, |
1077 | const struct acpi_device_id *ids) | |
1078 | { | |
2b9c698e | 1079 | return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT; |
29b71a1c TR |
1080 | } |
1081 | EXPORT_SYMBOL(acpi_match_device_ids); | |
1082 | ||
733e6251 MW |
1083 | bool acpi_driver_match_device(struct device *dev, |
1084 | const struct device_driver *drv) | |
1085 | { | |
1086 | if (!drv->acpi_match_table) | |
2b9c698e RW |
1087 | return acpi_of_match_device(ACPI_COMPANION(dev), |
1088 | drv->of_match_table); | |
733e6251 | 1089 | |
2b9c698e RW |
1090 | return !!__acpi_match_device(acpi_companion_match(dev), |
1091 | drv->acpi_match_table, drv->of_match_table); | |
733e6251 MW |
1092 | } |
1093 | EXPORT_SYMBOL_GPL(acpi_driver_match_device); | |
1094 | ||
0b224527 RW |
1095 | static void acpi_free_power_resources_lists(struct acpi_device *device) |
1096 | { | |
1097 | int i; | |
1098 | ||
993cbe59 RW |
1099 | if (device->wakeup.flags.valid) |
1100 | acpi_power_resources_list_free(&device->wakeup.resources); | |
1101 | ||
1b1f3e16 | 1102 | if (!device->power.flags.power_resources) |
0b224527 RW |
1103 | return; |
1104 | ||
1105 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { | |
1106 | struct acpi_device_power_state *ps = &device->power.states[i]; | |
1107 | acpi_power_resources_list_free(&ps->resources); | |
1108 | } | |
7f47fa6c BH |
1109 | } |
1110 | ||
1890a97a | 1111 | static void acpi_device_release(struct device *dev) |
1da177e4 | 1112 | { |
1890a97a | 1113 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1da177e4 | 1114 | |
ffdcd955 | 1115 | acpi_free_properties(acpi_dev); |
c0af4175 | 1116 | acpi_free_pnp_ids(&acpi_dev->pnp); |
0b224527 | 1117 | acpi_free_power_resources_lists(acpi_dev); |
1890a97a | 1118 | kfree(acpi_dev); |
1da177e4 LT |
1119 | } |
1120 | ||
5d9464a4 | 1121 | static int acpi_bus_match(struct device *dev, struct device_driver *drv) |
9e89dde2 | 1122 | { |
5d9464a4 PM |
1123 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1124 | struct acpi_driver *acpi_drv = to_acpi_driver(drv); | |
1da177e4 | 1125 | |
209d3b17 | 1126 | return acpi_dev->flags.match_driver |
805d410f | 1127 | && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); |
5d9464a4 | 1128 | } |
1da177e4 | 1129 | |
7eff2e7a | 1130 | static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 | 1131 | { |
8765c5ba | 1132 | return __acpi_device_uevent_modalias(to_acpi_device(dev), env); |
1da177e4 LT |
1133 | } |
1134 | ||
46ec8598 BH |
1135 | static void acpi_device_notify(acpi_handle handle, u32 event, void *data) |
1136 | { | |
1137 | struct acpi_device *device = data; | |
1138 | ||
1139 | device->driver->ops.notify(device, event); | |
1140 | } | |
1141 | ||
236105db | 1142 | static void acpi_device_notify_fixed(void *data) |
46ec8598 BH |
1143 | { |
1144 | struct acpi_device *device = data; | |
1145 | ||
53de5356 BH |
1146 | /* Fixed hardware devices have no handles */ |
1147 | acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); | |
236105db LT |
1148 | } |
1149 | ||
fd9caef4 | 1150 | static u32 acpi_device_fixed_event(void *data) |
236105db LT |
1151 | { |
1152 | acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data); | |
fd9caef4 | 1153 | return ACPI_INTERRUPT_HANDLED; |
46ec8598 BH |
1154 | } |
1155 | ||
1156 | static int acpi_device_install_notify_handler(struct acpi_device *device) | |
1157 | { | |
1158 | acpi_status status; | |
46ec8598 | 1159 | |
ccba2a36 | 1160 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 BH |
1161 | status = |
1162 | acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, | |
236105db | 1163 | acpi_device_fixed_event, |
46ec8598 | 1164 | device); |
ccba2a36 | 1165 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 BH |
1166 | status = |
1167 | acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, | |
236105db | 1168 | acpi_device_fixed_event, |
46ec8598 BH |
1169 | device); |
1170 | else | |
1171 | status = acpi_install_notify_handler(device->handle, | |
1172 | ACPI_DEVICE_NOTIFY, | |
1173 | acpi_device_notify, | |
1174 | device); | |
1175 | ||
1176 | if (ACPI_FAILURE(status)) | |
1177 | return -EINVAL; | |
1178 | return 0; | |
1179 | } | |
1180 | ||
1181 | static void acpi_device_remove_notify_handler(struct acpi_device *device) | |
1182 | { | |
ccba2a36 | 1183 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 | 1184 | acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, |
236105db | 1185 | acpi_device_fixed_event); |
ccba2a36 | 1186 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 | 1187 | acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, |
236105db | 1188 | acpi_device_fixed_event); |
46ec8598 BH |
1189 | else |
1190 | acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, | |
1191 | acpi_device_notify); | |
1192 | } | |
1193 | ||
d9e455f5 | 1194 | static int acpi_device_probe(struct device *dev) |
1da177e4 | 1195 | { |
5d9464a4 PM |
1196 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1197 | struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); | |
1198 | int ret; | |
1199 | ||
fc2e0a83 | 1200 | if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) |
24071f47 RW |
1201 | return -EINVAL; |
1202 | ||
d9e455f5 RW |
1203 | if (!acpi_drv->ops.add) |
1204 | return -ENOSYS; | |
46ec8598 | 1205 | |
d9e455f5 RW |
1206 | ret = acpi_drv->ops.add(acpi_dev); |
1207 | if (ret) | |
1208 | return ret; | |
46ec8598 | 1209 | |
d9e455f5 RW |
1210 | acpi_dev->driver = acpi_drv; |
1211 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
1212 | "Driver [%s] successfully bound to device [%s]\n", | |
1213 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
1214 | ||
1215 | if (acpi_drv->ops.notify) { | |
1216 | ret = acpi_device_install_notify_handler(acpi_dev); | |
1217 | if (ret) { | |
1218 | if (acpi_drv->ops.remove) | |
1219 | acpi_drv->ops.remove(acpi_dev); | |
1220 | ||
1221 | acpi_dev->driver = NULL; | |
1222 | acpi_dev->driver_data = NULL; | |
1223 | return ret; | |
1224 | } | |
5d9464a4 | 1225 | } |
d9e455f5 RW |
1226 | |
1227 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n", | |
1228 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
1229 | get_device(dev); | |
1230 | return 0; | |
5d9464a4 | 1231 | } |
1da177e4 | 1232 | |
5d9464a4 PM |
1233 | static int acpi_device_remove(struct device * dev) |
1234 | { | |
1235 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
1236 | struct acpi_driver *acpi_drv = acpi_dev->driver; | |
1237 | ||
1238 | if (acpi_drv) { | |
46ec8598 BH |
1239 | if (acpi_drv->ops.notify) |
1240 | acpi_device_remove_notify_handler(acpi_dev); | |
5d9464a4 | 1241 | if (acpi_drv->ops.remove) |
51fac838 | 1242 | acpi_drv->ops.remove(acpi_dev); |
1da177e4 | 1243 | } |
5d9464a4 | 1244 | acpi_dev->driver = NULL; |
db89b4f0 | 1245 | acpi_dev->driver_data = NULL; |
1da177e4 | 1246 | |
5d9464a4 | 1247 | put_device(dev); |
9e89dde2 ZR |
1248 | return 0; |
1249 | } | |
1da177e4 | 1250 | |
55955aad | 1251 | struct bus_type acpi_bus_type = { |
9e89dde2 | 1252 | .name = "acpi", |
5d9464a4 PM |
1253 | .match = acpi_bus_match, |
1254 | .probe = acpi_device_probe, | |
1255 | .remove = acpi_device_remove, | |
1256 | .uevent = acpi_device_uevent, | |
9e89dde2 ZR |
1257 | }; |
1258 | ||
d783156e RW |
1259 | static void acpi_device_del(struct acpi_device *device) |
1260 | { | |
1261 | mutex_lock(&acpi_device_lock); | |
1262 | if (device->parent) | |
1263 | list_del(&device->node); | |
1264 | ||
1265 | list_del(&device->wakeup_list); | |
1266 | mutex_unlock(&acpi_device_lock); | |
1267 | ||
1268 | acpi_power_add_remove_device(device, false); | |
1269 | acpi_device_remove_files(device); | |
1270 | if (device->remove) | |
1271 | device->remove(device); | |
1272 | ||
1273 | device_del(&device->dev); | |
1274 | } | |
1275 | ||
1276 | static LIST_HEAD(acpi_device_del_list); | |
1277 | static DEFINE_MUTEX(acpi_device_del_lock); | |
1278 | ||
1279 | static void acpi_device_del_work_fn(struct work_struct *work_not_used) | |
1280 | { | |
1281 | for (;;) { | |
1282 | struct acpi_device *adev; | |
1283 | ||
1284 | mutex_lock(&acpi_device_del_lock); | |
1285 | ||
1286 | if (list_empty(&acpi_device_del_list)) { | |
1287 | mutex_unlock(&acpi_device_del_lock); | |
1288 | break; | |
1289 | } | |
1290 | adev = list_first_entry(&acpi_device_del_list, | |
1291 | struct acpi_device, del_list); | |
1292 | list_del(&adev->del_list); | |
1293 | ||
1294 | mutex_unlock(&acpi_device_del_lock); | |
1295 | ||
1296 | acpi_device_del(adev); | |
1297 | /* | |
1298 | * Drop references to all power resources that might have been | |
1299 | * used by the device. | |
1300 | */ | |
1301 | acpi_power_transition(adev, ACPI_STATE_D3_COLD); | |
1302 | put_device(&adev->dev); | |
1303 | } | |
1304 | } | |
1305 | ||
1306 | /** | |
1307 | * acpi_scan_drop_device - Drop an ACPI device object. | |
1308 | * @handle: Handle of an ACPI namespace node, not used. | |
1309 | * @context: Address of the ACPI device object to drop. | |
1310 | * | |
1311 | * This is invoked by acpi_ns_delete_node() during the removal of the ACPI | |
1312 | * namespace node the device object pointed to by @context is attached to. | |
1313 | * | |
1314 | * The unregistration is carried out asynchronously to avoid running | |
1315 | * acpi_device_del() under the ACPICA's namespace mutex and the list is used to | |
1316 | * ensure the correct ordering (the device objects must be unregistered in the | |
1317 | * same order in which the corresponding namespace nodes are deleted). | |
1318 | */ | |
1319 | static void acpi_scan_drop_device(acpi_handle handle, void *context) | |
caf5c03f | 1320 | { |
d783156e RW |
1321 | static DECLARE_WORK(work, acpi_device_del_work_fn); |
1322 | struct acpi_device *adev = context; | |
1323 | ||
1324 | mutex_lock(&acpi_device_del_lock); | |
1325 | ||
1326 | /* | |
1327 | * Use the ACPI hotplug workqueue which is ordered, so this work item | |
1328 | * won't run after any hotplug work items submitted subsequently. That | |
1329 | * prevents attempts to register device objects identical to those being | |
1330 | * deleted from happening concurrently (such attempts result from | |
1331 | * hotplug events handled via the ACPI hotplug workqueue). It also will | |
1332 | * run after all of the work items submitted previosuly, which helps | |
1333 | * those work items to ensure that they are not accessing stale device | |
1334 | * objects. | |
1335 | */ | |
1336 | if (list_empty(&acpi_device_del_list)) | |
1337 | acpi_queue_hotplug_work(&work); | |
1338 | ||
1339 | list_add_tail(&adev->del_list, &acpi_device_del_list); | |
1340 | /* Make acpi_ns_validate_handle() return NULL for this handle. */ | |
1341 | adev->handle = INVALID_ACPI_HANDLE; | |
1342 | ||
1343 | mutex_unlock(&acpi_device_del_lock); | |
caf5c03f RW |
1344 | } |
1345 | ||
78ea4639 RW |
1346 | static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device, |
1347 | void (*callback)(void *)) | |
caf5c03f RW |
1348 | { |
1349 | acpi_status status; | |
1350 | ||
1351 | if (!device) | |
1352 | return -EINVAL; | |
1353 | ||
78ea4639 RW |
1354 | status = acpi_get_data_full(handle, acpi_scan_drop_device, |
1355 | (void **)device, callback); | |
caf5c03f RW |
1356 | if (ACPI_FAILURE(status) || !*device) { |
1357 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", | |
1358 | handle)); | |
1359 | return -ENODEV; | |
1360 | } | |
1361 | return 0; | |
1362 | } | |
78ea4639 RW |
1363 | |
1364 | int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) | |
1365 | { | |
1366 | return acpi_get_device_data(handle, device, NULL); | |
1367 | } | |
6585925b | 1368 | EXPORT_SYMBOL(acpi_bus_get_device); |
caf5c03f | 1369 | |
78ea4639 RW |
1370 | static void get_acpi_device(void *dev) |
1371 | { | |
1372 | if (dev) | |
1373 | get_device(&((struct acpi_device *)dev)->dev); | |
1374 | } | |
1375 | ||
1376 | struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle) | |
1377 | { | |
1378 | struct acpi_device *adev = NULL; | |
1379 | ||
1380 | acpi_get_device_data(handle, &adev, get_acpi_device); | |
1381 | return adev; | |
1382 | } | |
1383 | ||
1384 | void acpi_bus_put_acpi_device(struct acpi_device *adev) | |
1385 | { | |
1386 | put_device(&adev->dev); | |
1387 | } | |
1388 | ||
cf860be6 RW |
1389 | int acpi_device_add(struct acpi_device *device, |
1390 | void (*release)(struct device *)) | |
1da177e4 | 1391 | { |
4be44fcd | 1392 | int result; |
e49bd2dd ZR |
1393 | struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; |
1394 | int found = 0; | |
66b7ed40 | 1395 | |
d43e167d RW |
1396 | if (device->handle) { |
1397 | acpi_status status; | |
1398 | ||
d783156e | 1399 | status = acpi_attach_data(device->handle, acpi_scan_drop_device, |
d43e167d RW |
1400 | device); |
1401 | if (ACPI_FAILURE(status)) { | |
1402 | acpi_handle_err(device->handle, | |
1403 | "Unable to attach device data\n"); | |
1404 | return -ENODEV; | |
1405 | } | |
1406 | } | |
1407 | ||
9e89dde2 ZR |
1408 | /* |
1409 | * Linkage | |
1410 | * ------- | |
1411 | * Link this device to its parent and siblings. | |
1412 | */ | |
1413 | INIT_LIST_HEAD(&device->children); | |
1414 | INIT_LIST_HEAD(&device->node); | |
9e89dde2 | 1415 | INIT_LIST_HEAD(&device->wakeup_list); |
1033f904 | 1416 | INIT_LIST_HEAD(&device->physical_node_list); |
d783156e | 1417 | INIT_LIST_HEAD(&device->del_list); |
1033f904 | 1418 | mutex_init(&device->physical_node_lock); |
1da177e4 | 1419 | |
e49bd2dd ZR |
1420 | new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); |
1421 | if (!new_bus_id) { | |
d43e167d RW |
1422 | pr_err(PREFIX "Memory allocation error\n"); |
1423 | result = -ENOMEM; | |
1424 | goto err_detach; | |
1da177e4 | 1425 | } |
e49bd2dd | 1426 | |
9090589d | 1427 | mutex_lock(&acpi_device_lock); |
e49bd2dd ZR |
1428 | /* |
1429 | * Find suitable bus_id and instance number in acpi_bus_id_list | |
1430 | * If failed, create one and link it into acpi_bus_id_list | |
1431 | */ | |
1432 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { | |
1131b938 BH |
1433 | if (!strcmp(acpi_device_bus_id->bus_id, |
1434 | acpi_device_hid(device))) { | |
1435 | acpi_device_bus_id->instance_no++; | |
e49bd2dd ZR |
1436 | found = 1; |
1437 | kfree(new_bus_id); | |
1438 | break; | |
1439 | } | |
1da177e4 | 1440 | } |
0c526d96 | 1441 | if (!found) { |
e49bd2dd | 1442 | acpi_device_bus_id = new_bus_id; |
1131b938 | 1443 | strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); |
e49bd2dd ZR |
1444 | acpi_device_bus_id->instance_no = 0; |
1445 | list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); | |
1da177e4 | 1446 | } |
0794469d | 1447 | dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); |
1da177e4 | 1448 | |
33b57150 | 1449 | if (device->parent) |
9e89dde2 | 1450 | list_add_tail(&device->node, &device->parent->children); |
33b57150 | 1451 | |
9e89dde2 ZR |
1452 | if (device->wakeup.flags.valid) |
1453 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); | |
9090589d | 1454 | mutex_unlock(&acpi_device_lock); |
1da177e4 | 1455 | |
1890a97a | 1456 | if (device->parent) |
66b7ed40 | 1457 | device->dev.parent = &device->parent->dev; |
1890a97a | 1458 | device->dev.bus = &acpi_bus_type; |
82c7d5ef | 1459 | device->dev.release = release; |
cf860be6 | 1460 | result = device_add(&device->dev); |
0c526d96 | 1461 | if (result) { |
8b12b922 | 1462 | dev_err(&device->dev, "Error registering device\n"); |
d43e167d | 1463 | goto err; |
1da177e4 | 1464 | } |
1da177e4 | 1465 | |
e49bd2dd | 1466 | result = acpi_device_setup_files(device); |
0c526d96 | 1467 | if (result) |
0794469d KS |
1468 | printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", |
1469 | dev_name(&device->dev)); | |
1da177e4 | 1470 | |
1da177e4 | 1471 | return 0; |
d43e167d RW |
1472 | |
1473 | err: | |
9090589d | 1474 | mutex_lock(&acpi_device_lock); |
33b57150 | 1475 | if (device->parent) |
e49bd2dd | 1476 | list_del(&device->node); |
e49bd2dd | 1477 | list_del(&device->wakeup_list); |
9090589d | 1478 | mutex_unlock(&acpi_device_lock); |
d43e167d RW |
1479 | |
1480 | err_detach: | |
d783156e | 1481 | acpi_detach_data(device->handle, acpi_scan_drop_device); |
e49bd2dd | 1482 | return result; |
1da177e4 LT |
1483 | } |
1484 | ||
8a0662d9 RW |
1485 | struct acpi_device *acpi_get_next_child(struct device *dev, |
1486 | struct acpi_device *child) | |
1487 | { | |
1488 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
1489 | struct list_head *head, *next; | |
1490 | ||
1491 | if (!adev) | |
1492 | return NULL; | |
1493 | ||
1494 | head = &adev->children; | |
1495 | if (list_empty(head)) | |
1496 | return NULL; | |
1497 | ||
1498 | if (!child) | |
1499 | return list_first_entry(head, struct acpi_device, node); | |
1500 | ||
1501 | next = child->node.next; | |
1502 | return next == head ? NULL : list_entry(next, struct acpi_device, node); | |
1503 | } | |
1504 | ||
9e89dde2 ZR |
1505 | /* -------------------------------------------------------------------------- |
1506 | Driver Management | |
1507 | -------------------------------------------------------------------------- */ | |
9e89dde2 ZR |
1508 | /** |
1509 | * acpi_bus_register_driver - register a driver with the ACPI bus | |
1510 | * @driver: driver being registered | |
1511 | * | |
1512 | * Registers a driver with the ACPI bus. Searches the namespace for all | |
1513 | * devices that match the driver's criteria and binds. Returns zero for | |
1514 | * success or a negative error status for failure. | |
1515 | */ | |
1516 | int acpi_bus_register_driver(struct acpi_driver *driver) | |
1da177e4 | 1517 | { |
1890a97a | 1518 | int ret; |
1da177e4 | 1519 | |
9e89dde2 ZR |
1520 | if (acpi_disabled) |
1521 | return -ENODEV; | |
1890a97a PM |
1522 | driver->drv.name = driver->name; |
1523 | driver->drv.bus = &acpi_bus_type; | |
1524 | driver->drv.owner = driver->owner; | |
1da177e4 | 1525 | |
1890a97a PM |
1526 | ret = driver_register(&driver->drv); |
1527 | return ret; | |
9e89dde2 | 1528 | } |
1da177e4 | 1529 | |
9e89dde2 ZR |
1530 | EXPORT_SYMBOL(acpi_bus_register_driver); |
1531 | ||
1532 | /** | |
b27b14ce | 1533 | * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus |
9e89dde2 ZR |
1534 | * @driver: driver to unregister |
1535 | * | |
1536 | * Unregisters a driver with the ACPI bus. Searches the namespace for all | |
1537 | * devices that match the driver's criteria and unbinds. | |
1538 | */ | |
1539 | void acpi_bus_unregister_driver(struct acpi_driver *driver) | |
1540 | { | |
1890a97a | 1541 | driver_unregister(&driver->drv); |
9e89dde2 ZR |
1542 | } |
1543 | ||
1544 | EXPORT_SYMBOL(acpi_bus_unregister_driver); | |
1545 | ||
9e89dde2 ZR |
1546 | /* -------------------------------------------------------------------------- |
1547 | Device Enumeration | |
1548 | -------------------------------------------------------------------------- */ | |
5c478f49 BH |
1549 | static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) |
1550 | { | |
456de893 | 1551 | struct acpi_device *device = NULL; |
5c478f49 | 1552 | acpi_status status; |
5c478f49 BH |
1553 | |
1554 | /* | |
1555 | * Fixed hardware devices do not appear in the namespace and do not | |
1556 | * have handles, but we fabricate acpi_devices for them, so we have | |
1557 | * to deal with them specially. | |
1558 | */ | |
456de893 | 1559 | if (!handle) |
5c478f49 BH |
1560 | return acpi_root; |
1561 | ||
1562 | do { | |
1563 | status = acpi_get_parent(handle, &handle); | |
5c478f49 | 1564 | if (ACPI_FAILURE(status)) |
456de893 RW |
1565 | return status == AE_NULL_ENTRY ? NULL : acpi_root; |
1566 | } while (acpi_bus_get_device(handle, &device)); | |
1567 | return device; | |
5c478f49 BH |
1568 | } |
1569 | ||
9e89dde2 ZR |
1570 | acpi_status |
1571 | acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) | |
1572 | { | |
1573 | acpi_status status; | |
1574 | acpi_handle tmp; | |
1575 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
1576 | union acpi_object *obj; | |
1577 | ||
1578 | status = acpi_get_handle(handle, "_EJD", &tmp); | |
1579 | if (ACPI_FAILURE(status)) | |
1580 | return status; | |
1581 | ||
1582 | status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); | |
1583 | if (ACPI_SUCCESS(status)) { | |
1584 | obj = buffer.pointer; | |
3b5fee59 HM |
1585 | status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, |
1586 | ejd); | |
9e89dde2 ZR |
1587 | kfree(buffer.pointer); |
1588 | } | |
1589 | return status; | |
1590 | } | |
1591 | EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); | |
1592 | ||
e88c9c60 RW |
1593 | static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle, |
1594 | struct acpi_device_wakeup *wakeup) | |
9e89dde2 | 1595 | { |
b581a7f9 RW |
1596 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1597 | union acpi_object *package = NULL; | |
9e89dde2 | 1598 | union acpi_object *element = NULL; |
b581a7f9 | 1599 | acpi_status status; |
e88c9c60 | 1600 | int err = -ENODATA; |
9e89dde2 | 1601 | |
b581a7f9 | 1602 | if (!wakeup) |
e88c9c60 | 1603 | return -EINVAL; |
9e89dde2 | 1604 | |
993cbe59 | 1605 | INIT_LIST_HEAD(&wakeup->resources); |
9e89dde2 | 1606 | |
b581a7f9 RW |
1607 | /* _PRW */ |
1608 | status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); | |
1609 | if (ACPI_FAILURE(status)) { | |
1610 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); | |
e88c9c60 | 1611 | return err; |
b581a7f9 RW |
1612 | } |
1613 | ||
1614 | package = (union acpi_object *)buffer.pointer; | |
1615 | ||
e88c9c60 | 1616 | if (!package || package->package.count < 2) |
b581a7f9 | 1617 | goto out; |
b581a7f9 | 1618 | |
9e89dde2 | 1619 | element = &(package->package.elements[0]); |
e88c9c60 | 1620 | if (!element) |
b581a7f9 | 1621 | goto out; |
e88c9c60 | 1622 | |
9e89dde2 ZR |
1623 | if (element->type == ACPI_TYPE_PACKAGE) { |
1624 | if ((element->package.count < 2) || | |
1625 | (element->package.elements[0].type != | |
1626 | ACPI_TYPE_LOCAL_REFERENCE) | |
e88c9c60 | 1627 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) |
b581a7f9 | 1628 | goto out; |
e88c9c60 | 1629 | |
b581a7f9 | 1630 | wakeup->gpe_device = |
9e89dde2 | 1631 | element->package.elements[0].reference.handle; |
b581a7f9 | 1632 | wakeup->gpe_number = |
9e89dde2 ZR |
1633 | (u32) element->package.elements[1].integer.value; |
1634 | } else if (element->type == ACPI_TYPE_INTEGER) { | |
b581a7f9 RW |
1635 | wakeup->gpe_device = NULL; |
1636 | wakeup->gpe_number = element->integer.value; | |
1637 | } else { | |
b581a7f9 RW |
1638 | goto out; |
1639 | } | |
9e89dde2 ZR |
1640 | |
1641 | element = &(package->package.elements[1]); | |
e88c9c60 | 1642 | if (element->type != ACPI_TYPE_INTEGER) |
b581a7f9 | 1643 | goto out; |
e88c9c60 | 1644 | |
b581a7f9 | 1645 | wakeup->sleep_state = element->integer.value; |
9e89dde2 | 1646 | |
e88c9c60 RW |
1647 | err = acpi_extract_power_resources(package, 2, &wakeup->resources); |
1648 | if (err) | |
b581a7f9 | 1649 | goto out; |
9e89dde2 | 1650 | |
0596a52b RW |
1651 | if (!list_empty(&wakeup->resources)) { |
1652 | int sleep_state; | |
9e89dde2 | 1653 | |
b5d667eb RW |
1654 | err = acpi_power_wakeup_list_init(&wakeup->resources, |
1655 | &sleep_state); | |
1656 | if (err) { | |
1657 | acpi_handle_warn(handle, "Retrieving current states " | |
1658 | "of wakeup power resources failed\n"); | |
1659 | acpi_power_resources_list_free(&wakeup->resources); | |
1660 | goto out; | |
1661 | } | |
0596a52b RW |
1662 | if (sleep_state < wakeup->sleep_state) { |
1663 | acpi_handle_warn(handle, "Overriding _PRW sleep state " | |
1664 | "(S%d) by S%d from power resources\n", | |
1665 | (int)wakeup->sleep_state, sleep_state); | |
1666 | wakeup->sleep_state = sleep_state; | |
1667 | } | |
1668 | } | |
9874647b | 1669 | |
b581a7f9 RW |
1670 | out: |
1671 | kfree(buffer.pointer); | |
e88c9c60 | 1672 | return err; |
1da177e4 LT |
1673 | } |
1674 | ||
bd9b2f9a | 1675 | static void acpi_wakeup_gpe_init(struct acpi_device *device) |
1da177e4 | 1676 | { |
0519ade7 | 1677 | static const struct acpi_device_id button_device_ids[] = { |
29b71a1c | 1678 | {"PNP0C0C", 0}, |
b7e38304 | 1679 | {"PNP0C0D", 0}, |
29b71a1c TR |
1680 | {"PNP0C0E", 0}, |
1681 | {"", 0}, | |
1682 | }; | |
bd9b2f9a | 1683 | struct acpi_device_wakeup *wakeup = &device->wakeup; |
f517709d RW |
1684 | acpi_status status; |
1685 | acpi_event_status event_status; | |
1686 | ||
bd9b2f9a | 1687 | wakeup->flags.notifier_present = 0; |
f517709d RW |
1688 | |
1689 | /* Power button, Lid switch always enable wakeup */ | |
1690 | if (!acpi_match_device_ids(device, button_device_ids)) { | |
bd9b2f9a | 1691 | wakeup->flags.run_wake = 1; |
b7e38304 ZR |
1692 | if (!acpi_match_device_ids(device, &button_device_ids[1])) { |
1693 | /* Do not use Lid/sleep button for S5 wakeup */ | |
bd9b2f9a RW |
1694 | if (wakeup->sleep_state == ACPI_STATE_S5) |
1695 | wakeup->sleep_state = ACPI_STATE_S4; | |
b7e38304 | 1696 | } |
bd9b2f9a | 1697 | acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number); |
f2b56bc8 | 1698 | device_set_wakeup_capable(&device->dev, true); |
f517709d RW |
1699 | return; |
1700 | } | |
1701 | ||
bd9b2f9a RW |
1702 | acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device, |
1703 | wakeup->gpe_number); | |
1704 | status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number, | |
1705 | &event_status); | |
1706 | if (ACPI_FAILURE(status)) | |
1707 | return; | |
1708 | ||
2f857234 | 1709 | wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER); |
f517709d RW |
1710 | } |
1711 | ||
d57d09a4 | 1712 | static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
f517709d | 1713 | { |
e88c9c60 | 1714 | int err; |
29b71a1c | 1715 | |
d57d09a4 | 1716 | /* Presence of _PRW indicates wake capable */ |
952c63e9 | 1717 | if (!acpi_has_method(device->handle, "_PRW")) |
d57d09a4 RW |
1718 | return; |
1719 | ||
e88c9c60 RW |
1720 | err = acpi_bus_extract_wakeup_device_power_package(device->handle, |
1721 | &device->wakeup); | |
1722 | if (err) { | |
1723 | dev_err(&device->dev, "_PRW evaluation error: %d\n", err); | |
d57d09a4 | 1724 | return; |
9e89dde2 | 1725 | } |
1da177e4 | 1726 | |
9e89dde2 | 1727 | device->wakeup.flags.valid = 1; |
9b83ccd2 | 1728 | device->wakeup.prepare_count = 0; |
bd9b2f9a | 1729 | acpi_wakeup_gpe_init(device); |
729b2bdb ZY |
1730 | /* Call _PSW/_DSW object to disable its ability to wake the sleeping |
1731 | * system for the ACPI device with the _PRW object. | |
1732 | * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW. | |
1733 | * So it is necessary to call _DSW object first. Only when it is not | |
1734 | * present will the _PSW object used. | |
1735 | */ | |
e88c9c60 RW |
1736 | err = acpi_device_sleep_wake(device, 0, 0, 0); |
1737 | if (err) | |
77e76609 RW |
1738 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
1739 | "error in _DSW or _PSW evaluation\n")); | |
1da177e4 | 1740 | } |
1da177e4 | 1741 | |
f33ce568 RW |
1742 | static void acpi_bus_init_power_state(struct acpi_device *device, int state) |
1743 | { | |
1744 | struct acpi_device_power_state *ps = &device->power.states[state]; | |
ef85bdbe RW |
1745 | char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; |
1746 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
f33ce568 | 1747 | acpi_status status; |
bf325f95 | 1748 | |
f33ce568 RW |
1749 | INIT_LIST_HEAD(&ps->resources); |
1750 | ||
ef85bdbe RW |
1751 | /* Evaluate "_PRx" to get referenced power resources */ |
1752 | status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer); | |
1753 | if (ACPI_SUCCESS(status)) { | |
1754 | union acpi_object *package = buffer.pointer; | |
1755 | ||
1756 | if (buffer.length && package | |
1757 | && package->type == ACPI_TYPE_PACKAGE | |
1758 | && package->package.count) { | |
e88c9c60 RW |
1759 | int err = acpi_extract_power_resources(package, 0, |
1760 | &ps->resources); | |
1761 | if (!err) | |
ef85bdbe | 1762 | device->power.flags.power_resources = 1; |
f33ce568 | 1763 | } |
ef85bdbe | 1764 | ACPI_FREE(buffer.pointer); |
f33ce568 RW |
1765 | } |
1766 | ||
1767 | /* Evaluate "_PSx" to see if we can do explicit sets */ | |
ef85bdbe | 1768 | pathname[2] = 'S'; |
952c63e9 | 1769 | if (acpi_has_method(device->handle, pathname)) |
f33ce568 RW |
1770 | ps->flags.explicit_set = 1; |
1771 | ||
20dacb71 RW |
1772 | /* State is valid if there are means to put the device into it. */ |
1773 | if (!list_empty(&ps->resources) || ps->flags.explicit_set) | |
f33ce568 | 1774 | ps->flags.valid = 1; |
f33ce568 RW |
1775 | |
1776 | ps->power = -1; /* Unknown - driver assigned */ | |
1777 | ps->latency = -1; /* Unknown - driver assigned */ | |
1778 | } | |
1779 | ||
d43e167d | 1780 | static void acpi_bus_get_power_flags(struct acpi_device *device) |
1da177e4 | 1781 | { |
8bc5053b | 1782 | u32 i; |
1a365616 | 1783 | |
d43e167d | 1784 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ |
952c63e9 JL |
1785 | if (!acpi_has_method(device->handle, "_PS0") && |
1786 | !acpi_has_method(device->handle, "_PR0")) | |
1787 | return; | |
1a365616 | 1788 | |
d43e167d | 1789 | device->flags.power_manageable = 1; |
4be44fcd | 1790 | |
9e89dde2 ZR |
1791 | /* |
1792 | * Power Management Flags | |
1793 | */ | |
952c63e9 | 1794 | if (acpi_has_method(device->handle, "_PSC")) |
9e89dde2 | 1795 | device->power.flags.explicit_get = 1; |
f25c0ae2 | 1796 | |
952c63e9 | 1797 | if (acpi_has_method(device->handle, "_IRC")) |
9e89dde2 | 1798 | device->power.flags.inrush_current = 1; |
1da177e4 | 1799 | |
f25c0ae2 RW |
1800 | if (acpi_has_method(device->handle, "_DSW")) |
1801 | device->power.flags.dsw_present = 1; | |
1802 | ||
9e89dde2 ZR |
1803 | /* |
1804 | * Enumerate supported power management states | |
1805 | */ | |
f33ce568 RW |
1806 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) |
1807 | acpi_bus_init_power_state(device, i); | |
bf325f95 | 1808 | |
0b224527 | 1809 | INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); |
20dacb71 RW |
1810 | if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources)) |
1811 | device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; | |
1da177e4 | 1812 | |
20dacb71 | 1813 | /* Set defaults for D0 and D3hot states (always valid) */ |
9e89dde2 ZR |
1814 | device->power.states[ACPI_STATE_D0].flags.valid = 1; |
1815 | device->power.states[ACPI_STATE_D0].power = 100; | |
20dacb71 | 1816 | device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1; |
1399dfcd | 1817 | |
1b1f3e16 | 1818 | if (acpi_bus_init_power(device)) |
b3785492 | 1819 | device->flags.power_manageable = 0; |
9e89dde2 | 1820 | } |
c8f7a62c | 1821 | |
d43e167d | 1822 | static void acpi_bus_get_flags(struct acpi_device *device) |
1da177e4 | 1823 | { |
1da177e4 | 1824 | /* Presence of _STA indicates 'dynamic_status' */ |
952c63e9 | 1825 | if (acpi_has_method(device->handle, "_STA")) |
1da177e4 LT |
1826 | device->flags.dynamic_status = 1; |
1827 | ||
1da177e4 | 1828 | /* Presence of _RMV indicates 'removable' */ |
952c63e9 | 1829 | if (acpi_has_method(device->handle, "_RMV")) |
1da177e4 LT |
1830 | device->flags.removable = 1; |
1831 | ||
1832 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ | |
952c63e9 JL |
1833 | if (acpi_has_method(device->handle, "_EJD") || |
1834 | acpi_has_method(device->handle, "_EJ0")) | |
1da177e4 | 1835 | device->flags.ejectable = 1; |
1da177e4 LT |
1836 | } |
1837 | ||
c7bcb4e9 | 1838 | static void acpi_device_get_busid(struct acpi_device *device) |
1da177e4 | 1839 | { |
4be44fcd LB |
1840 | char bus_id[5] = { '?', 0 }; |
1841 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; | |
1842 | int i = 0; | |
1da177e4 LT |
1843 | |
1844 | /* | |
1845 | * Bus ID | |
1846 | * ------ | |
1847 | * The device's Bus ID is simply the object name. | |
1848 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? | |
1849 | */ | |
859ac9a4 | 1850 | if (ACPI_IS_ROOT_DEVICE(device)) { |
1da177e4 | 1851 | strcpy(device->pnp.bus_id, "ACPI"); |
859ac9a4 BH |
1852 | return; |
1853 | } | |
1854 | ||
1855 | switch (device->device_type) { | |
1da177e4 LT |
1856 | case ACPI_BUS_TYPE_POWER_BUTTON: |
1857 | strcpy(device->pnp.bus_id, "PWRF"); | |
1858 | break; | |
1859 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
1860 | strcpy(device->pnp.bus_id, "SLPF"); | |
1861 | break; | |
1862 | default: | |
66b7ed40 | 1863 | acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); |
1da177e4 LT |
1864 | /* Clean up trailing underscores (if any) */ |
1865 | for (i = 3; i > 1; i--) { | |
1866 | if (bus_id[i] == '_') | |
1867 | bus_id[i] = '\0'; | |
1868 | else | |
1869 | break; | |
1870 | } | |
1871 | strcpy(device->pnp.bus_id, bus_id); | |
1872 | break; | |
1873 | } | |
1874 | } | |
1875 | ||
ebf4df8d JL |
1876 | /* |
1877 | * acpi_ata_match - see if an acpi object is an ATA device | |
1878 | * | |
1879 | * If an acpi object has one of the ACPI ATA methods defined, | |
1880 | * then we can safely call it an ATA device. | |
1881 | */ | |
1882 | bool acpi_ata_match(acpi_handle handle) | |
1883 | { | |
1884 | return acpi_has_method(handle, "_GTF") || | |
1885 | acpi_has_method(handle, "_GTM") || | |
1886 | acpi_has_method(handle, "_STM") || | |
1887 | acpi_has_method(handle, "_SDD"); | |
1888 | } | |
1889 | ||
54735266 | 1890 | /* |
d4e1a692 | 1891 | * acpi_bay_match - see if an acpi object is an ejectable driver bay |
54735266 ZR |
1892 | * |
1893 | * If an acpi object is ejectable and has one of the ACPI ATA methods defined, | |
1894 | * then we can safely call it an ejectable drive bay | |
1895 | */ | |
ebf4df8d | 1896 | bool acpi_bay_match(acpi_handle handle) |
d4e1a692 | 1897 | { |
54735266 ZR |
1898 | acpi_handle phandle; |
1899 | ||
952c63e9 | 1900 | if (!acpi_has_method(handle, "_EJ0")) |
ebf4df8d JL |
1901 | return false; |
1902 | if (acpi_ata_match(handle)) | |
1903 | return true; | |
1904 | if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) | |
1905 | return false; | |
54735266 | 1906 | |
ebf4df8d | 1907 | return acpi_ata_match(phandle); |
54735266 ZR |
1908 | } |
1909 | ||
b43109fa | 1910 | bool acpi_device_is_battery(struct acpi_device *adev) |
1e2380cd | 1911 | { |
b43109fa | 1912 | struct acpi_hardware_id *hwid; |
1e2380cd | 1913 | |
b43109fa RW |
1914 | list_for_each_entry(hwid, &adev->pnp.ids, list) |
1915 | if (!strcmp("PNP0C0A", hwid->id)) | |
1916 | return true; | |
1e2380cd | 1917 | |
b43109fa | 1918 | return false; |
1e2380cd RW |
1919 | } |
1920 | ||
b43109fa | 1921 | static bool is_ejectable_bay(struct acpi_device *adev) |
1e2380cd | 1922 | { |
b43109fa RW |
1923 | acpi_handle handle = adev->handle; |
1924 | ||
1925 | if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev)) | |
1e2380cd RW |
1926 | return true; |
1927 | ||
1928 | return acpi_bay_match(handle); | |
1929 | } | |
1930 | ||
3620f2f2 | 1931 | /* |
d4e1a692 | 1932 | * acpi_dock_match - see if an acpi object has a _DCK method |
3620f2f2 | 1933 | */ |
ebf4df8d | 1934 | bool acpi_dock_match(acpi_handle handle) |
3620f2f2 | 1935 | { |
ebf4df8d | 1936 | return acpi_has_method(handle, "_DCK"); |
3620f2f2 FS |
1937 | } |
1938 | ||
adc8bb8e HG |
1939 | static acpi_status |
1940 | acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context, | |
1941 | void **return_value) | |
1942 | { | |
1943 | long *cap = context; | |
1944 | ||
1945 | if (acpi_has_method(handle, "_BCM") && | |
1946 | acpi_has_method(handle, "_BCL")) { | |
1947 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight " | |
1948 | "support\n")); | |
1949 | *cap |= ACPI_VIDEO_BACKLIGHT; | |
1950 | if (!acpi_has_method(handle, "_BQC")) | |
1951 | printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, " | |
1952 | "cannot determine initial brightness\n"); | |
1953 | /* We have backlight support, no need to scan further */ | |
1954 | return AE_CTRL_TERMINATE; | |
1955 | } | |
1956 | return 0; | |
1957 | } | |
1958 | ||
1959 | /* Returns true if the ACPI object is a video device which can be | |
1960 | * handled by video.ko. | |
1961 | * The device will get a Linux specific CID added in scan.c to | |
1962 | * identify the device as an ACPI graphics device | |
1963 | * Be aware that the graphics device may not be physically present | |
1964 | * Use acpi_video_get_capabilities() to detect general ACPI video | |
1965 | * capabilities of present cards | |
1966 | */ | |
1967 | long acpi_is_video_device(acpi_handle handle) | |
1968 | { | |
1969 | long video_caps = 0; | |
1970 | ||
1971 | /* Is this device able to support video switching ? */ | |
1972 | if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS")) | |
1973 | video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING; | |
1974 | ||
1975 | /* Is this device able to retrieve a video ROM ? */ | |
1976 | if (acpi_has_method(handle, "_ROM")) | |
1977 | video_caps |= ACPI_VIDEO_ROM_AVAILABLE; | |
1978 | ||
1979 | /* Is this device able to configure which video head to be POSTed ? */ | |
1980 | if (acpi_has_method(handle, "_VPO") && | |
1981 | acpi_has_method(handle, "_GPD") && | |
1982 | acpi_has_method(handle, "_SPD")) | |
1983 | video_caps |= ACPI_VIDEO_DEVICE_POSTING; | |
1984 | ||
1985 | /* Only check for backlight functionality if one of the above hit. */ | |
1986 | if (video_caps) | |
1987 | acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, | |
1988 | ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL, | |
1989 | &video_caps, NULL); | |
1990 | ||
1991 | return video_caps; | |
1992 | } | |
1993 | EXPORT_SYMBOL(acpi_is_video_device); | |
1994 | ||
620e112c | 1995 | const char *acpi_device_hid(struct acpi_device *device) |
15b8dd53 | 1996 | { |
7f47fa6c | 1997 | struct acpi_hardware_id *hid; |
15b8dd53 | 1998 | |
2b2ae7c7 TR |
1999 | if (list_empty(&device->pnp.ids)) |
2000 | return dummy_hid; | |
2001 | ||
7f47fa6c BH |
2002 | hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); |
2003 | return hid->id; | |
2004 | } | |
2005 | EXPORT_SYMBOL(acpi_device_hid); | |
15b8dd53 | 2006 | |
d4e1a692 | 2007 | static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) |
7f47fa6c BH |
2008 | { |
2009 | struct acpi_hardware_id *id; | |
15b8dd53 | 2010 | |
7f47fa6c BH |
2011 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
2012 | if (!id) | |
2013 | return; | |
15b8dd53 | 2014 | |
581de59e | 2015 | id->id = kstrdup(dev_id, GFP_KERNEL); |
7f47fa6c BH |
2016 | if (!id->id) { |
2017 | kfree(id); | |
2018 | return; | |
15b8dd53 BM |
2019 | } |
2020 | ||
d4e1a692 TK |
2021 | list_add_tail(&id->list, &pnp->ids); |
2022 | pnp->type.hardware_id = 1; | |
15b8dd53 BM |
2023 | } |
2024 | ||
222e82ac DW |
2025 | /* |
2026 | * Old IBM workstations have a DSDT bug wherein the SMBus object | |
2027 | * lacks the SMBUS01 HID and the methods do not have the necessary "_" | |
2028 | * prefix. Work around this. | |
2029 | */ | |
ebf4df8d | 2030 | static bool acpi_ibm_smbus_match(acpi_handle handle) |
222e82ac | 2031 | { |
ebf4df8d JL |
2032 | char node_name[ACPI_PATH_SEGMENT_LENGTH]; |
2033 | struct acpi_buffer path = { sizeof(node_name), node_name }; | |
222e82ac DW |
2034 | |
2035 | if (!dmi_name_in_vendors("IBM")) | |
ebf4df8d | 2036 | return false; |
222e82ac DW |
2037 | |
2038 | /* Look for SMBS object */ | |
ebf4df8d JL |
2039 | if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || |
2040 | strcmp("SMBS", path.pointer)) | |
2041 | return false; | |
222e82ac DW |
2042 | |
2043 | /* Does it have the necessary (but misnamed) methods? */ | |
952c63e9 JL |
2044 | if (acpi_has_method(handle, "SBI") && |
2045 | acpi_has_method(handle, "SBR") && | |
2046 | acpi_has_method(handle, "SBW")) | |
ebf4df8d JL |
2047 | return true; |
2048 | ||
2049 | return false; | |
222e82ac DW |
2050 | } |
2051 | ||
ae3caa80 JL |
2052 | static bool acpi_object_is_system_bus(acpi_handle handle) |
2053 | { | |
2054 | acpi_handle tmp; | |
2055 | ||
2056 | if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) && | |
2057 | tmp == handle) | |
2058 | return true; | |
2059 | if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) && | |
2060 | tmp == handle) | |
2061 | return true; | |
2062 | ||
2063 | return false; | |
2064 | } | |
2065 | ||
c0af4175 TK |
2066 | static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, |
2067 | int device_type) | |
1da177e4 | 2068 | { |
4be44fcd | 2069 | acpi_status status; |
57f3674f | 2070 | struct acpi_device_info *info; |
78e25fef | 2071 | struct acpi_pnp_device_id_list *cid_list; |
7f47fa6c | 2072 | int i; |
1da177e4 | 2073 | |
c0af4175 | 2074 | switch (device_type) { |
1da177e4 | 2075 | case ACPI_BUS_TYPE_DEVICE: |
c0af4175 TK |
2076 | if (handle == ACPI_ROOT_OBJECT) { |
2077 | acpi_add_id(pnp, ACPI_SYSTEM_HID); | |
859ac9a4 BH |
2078 | break; |
2079 | } | |
2080 | ||
c0af4175 | 2081 | status = acpi_get_object_info(handle, &info); |
1da177e4 | 2082 | if (ACPI_FAILURE(status)) { |
c0af4175 TK |
2083 | pr_err(PREFIX "%s: Error reading device info\n", |
2084 | __func__); | |
1da177e4 LT |
2085 | return; |
2086 | } | |
2087 | ||
549e6845 | 2088 | if (info->valid & ACPI_VALID_HID) { |
c0af4175 | 2089 | acpi_add_id(pnp, info->hardware_id.string); |
549e6845 RW |
2090 | pnp->type.platform_id = 1; |
2091 | } | |
57f3674f | 2092 | if (info->valid & ACPI_VALID_CID) { |
15b8dd53 | 2093 | cid_list = &info->compatible_id_list; |
57f3674f | 2094 | for (i = 0; i < cid_list->count; i++) |
c0af4175 | 2095 | acpi_add_id(pnp, cid_list->ids[i].string); |
57f3674f | 2096 | } |
1da177e4 | 2097 | if (info->valid & ACPI_VALID_ADR) { |
c0af4175 TK |
2098 | pnp->bus_address = info->address; |
2099 | pnp->type.bus_address = 1; | |
1da177e4 | 2100 | } |
ccf78040 | 2101 | if (info->valid & ACPI_VALID_UID) |
c0af4175 | 2102 | pnp->unique_id = kstrdup(info->unique_id.string, |
ccf78040 | 2103 | GFP_KERNEL); |
ae843332 | 2104 | |
a83893ae BH |
2105 | kfree(info); |
2106 | ||
57f3674f BH |
2107 | /* |
2108 | * Some devices don't reliably have _HIDs & _CIDs, so add | |
2109 | * synthetic HIDs to make sure drivers can find them. | |
2110 | */ | |
c0af4175 TK |
2111 | if (acpi_is_video_device(handle)) |
2112 | acpi_add_id(pnp, ACPI_VIDEO_HID); | |
ebf4df8d | 2113 | else if (acpi_bay_match(handle)) |
c0af4175 | 2114 | acpi_add_id(pnp, ACPI_BAY_HID); |
ebf4df8d | 2115 | else if (acpi_dock_match(handle)) |
c0af4175 | 2116 | acpi_add_id(pnp, ACPI_DOCK_HID); |
ebf4df8d | 2117 | else if (acpi_ibm_smbus_match(handle)) |
c0af4175 | 2118 | acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); |
ae3caa80 JL |
2119 | else if (list_empty(&pnp->ids) && |
2120 | acpi_object_is_system_bus(handle)) { | |
2121 | /* \_SB, \_TZ, LNXSYBUS */ | |
2122 | acpi_add_id(pnp, ACPI_BUS_HID); | |
c0af4175 TK |
2123 | strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); |
2124 | strcpy(pnp->device_class, ACPI_BUS_CLASS); | |
b7b30de5 | 2125 | } |
54735266 | 2126 | |
1da177e4 LT |
2127 | break; |
2128 | case ACPI_BUS_TYPE_POWER: | |
c0af4175 | 2129 | acpi_add_id(pnp, ACPI_POWER_HID); |
1da177e4 LT |
2130 | break; |
2131 | case ACPI_BUS_TYPE_PROCESSOR: | |
c0af4175 | 2132 | acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID); |
1da177e4 | 2133 | break; |
1da177e4 | 2134 | case ACPI_BUS_TYPE_THERMAL: |
c0af4175 | 2135 | acpi_add_id(pnp, ACPI_THERMAL_HID); |
1da177e4 LT |
2136 | break; |
2137 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
c0af4175 | 2138 | acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF); |
1da177e4 LT |
2139 | break; |
2140 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
c0af4175 | 2141 | acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); |
1da177e4 LT |
2142 | break; |
2143 | } | |
1da177e4 LT |
2144 | } |
2145 | ||
c0af4175 TK |
2146 | void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) |
2147 | { | |
2148 | struct acpi_hardware_id *id, *tmp; | |
2149 | ||
2150 | list_for_each_entry_safe(id, tmp, &pnp->ids, list) { | |
2151 | kfree(id->id); | |
2152 | kfree(id); | |
2153 | } | |
2154 | kfree(pnp->unique_id); | |
2155 | } | |
2156 | ||
d0562674 SS |
2157 | static void acpi_init_coherency(struct acpi_device *adev) |
2158 | { | |
2159 | unsigned long long cca = 0; | |
2160 | acpi_status status; | |
2161 | struct acpi_device *parent = adev->parent; | |
2162 | ||
2163 | if (parent && parent->flags.cca_seen) { | |
2164 | /* | |
2165 | * From ACPI spec, OSPM will ignore _CCA if an ancestor | |
2166 | * already saw one. | |
2167 | */ | |
2168 | adev->flags.cca_seen = 1; | |
2169 | cca = parent->flags.coherent_dma; | |
2170 | } else { | |
2171 | status = acpi_evaluate_integer(adev->handle, "_CCA", | |
2172 | NULL, &cca); | |
2173 | if (ACPI_SUCCESS(status)) | |
2174 | adev->flags.cca_seen = 1; | |
2175 | else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED)) | |
2176 | /* | |
2177 | * If architecture does not specify that _CCA is | |
2178 | * required for DMA-able devices (e.g. x86), | |
2179 | * we default to _CCA=1. | |
2180 | */ | |
2181 | cca = 1; | |
2182 | else | |
2183 | acpi_handle_debug(adev->handle, | |
2184 | "ACPI device is missing _CCA.\n"); | |
2185 | } | |
2186 | ||
2187 | adev->flags.coherent_dma = cca; | |
2188 | } | |
2189 | ||
82c7d5ef RW |
2190 | void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, |
2191 | int type, unsigned long long sta) | |
1da177e4 | 2192 | { |
d43e167d RW |
2193 | INIT_LIST_HEAD(&device->pnp.ids); |
2194 | device->device_type = type; | |
2195 | device->handle = handle; | |
2196 | device->parent = acpi_bus_get_parent(handle); | |
8a0662d9 | 2197 | device->fwnode.type = FWNODE_ACPI; |
25db115b | 2198 | acpi_set_device_status(device, sta); |
d43e167d | 2199 | acpi_device_get_busid(device); |
c0af4175 | 2200 | acpi_set_pnp_ids(handle, &device->pnp, type); |
ffdcd955 | 2201 | acpi_init_properties(device); |
d43e167d | 2202 | acpi_bus_get_flags(device); |
2c0d4fe0 | 2203 | device->flags.match_driver = false; |
202317a5 RW |
2204 | device->flags.initialized = true; |
2205 | device->flags.visited = false; | |
cf860be6 RW |
2206 | device_initialize(&device->dev); |
2207 | dev_set_uevent_suppress(&device->dev, true); | |
d0562674 | 2208 | acpi_init_coherency(device); |
cf860be6 | 2209 | } |
bc3b0772 | 2210 | |
cf860be6 RW |
2211 | void acpi_device_add_finalize(struct acpi_device *device) |
2212 | { | |
2213 | dev_set_uevent_suppress(&device->dev, false); | |
2214 | kobject_uevent(&device->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
2215 | } |
2216 | ||
5c478f49 BH |
2217 | static int acpi_add_single_object(struct acpi_device **child, |
2218 | acpi_handle handle, int type, | |
2c0d4fe0 | 2219 | unsigned long long sta) |
1da177e4 | 2220 | { |
77c24888 BH |
2221 | int result; |
2222 | struct acpi_device *device; | |
29aaefa6 | 2223 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1da177e4 | 2224 | |
36bcbec7 | 2225 | device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); |
1da177e4 | 2226 | if (!device) { |
6468463a | 2227 | printk(KERN_ERR PREFIX "Memory allocation error\n"); |
d550d98d | 2228 | return -ENOMEM; |
1da177e4 | 2229 | } |
1da177e4 | 2230 | |
d43e167d RW |
2231 | acpi_init_device_object(device, handle, type, sta); |
2232 | acpi_bus_get_power_flags(device); | |
d57d09a4 | 2233 | acpi_bus_get_wakeup_device_flags(device); |
1da177e4 | 2234 | |
cf860be6 | 2235 | result = acpi_device_add(device, acpi_device_release); |
d43e167d | 2236 | if (result) { |
718fb0de | 2237 | acpi_device_release(&device->dev); |
d43e167d RW |
2238 | return result; |
2239 | } | |
1da177e4 | 2240 | |
d43e167d | 2241 | acpi_power_add_remove_device(device, true); |
cf860be6 | 2242 | acpi_device_add_finalize(device); |
d43e167d RW |
2243 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
2244 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n", | |
2245 | dev_name(&device->dev), (char *) buffer.pointer, | |
2246 | device->parent ? dev_name(&device->parent->dev) : "(null)")); | |
2247 | kfree(buffer.pointer); | |
2248 | *child = device; | |
2249 | return 0; | |
bf325f95 RW |
2250 | } |
2251 | ||
778cbc1d BH |
2252 | static int acpi_bus_type_and_status(acpi_handle handle, int *type, |
2253 | unsigned long long *sta) | |
1da177e4 | 2254 | { |
778cbc1d BH |
2255 | acpi_status status; |
2256 | acpi_object_type acpi_type; | |
1da177e4 | 2257 | |
778cbc1d | 2258 | status = acpi_get_type(handle, &acpi_type); |
51a85faf | 2259 | if (ACPI_FAILURE(status)) |
778cbc1d | 2260 | return -ENODEV; |
4be44fcd | 2261 | |
778cbc1d | 2262 | switch (acpi_type) { |
51a85faf BH |
2263 | case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ |
2264 | case ACPI_TYPE_DEVICE: | |
778cbc1d BH |
2265 | *type = ACPI_BUS_TYPE_DEVICE; |
2266 | status = acpi_bus_get_status_handle(handle, sta); | |
2267 | if (ACPI_FAILURE(status)) | |
2268 | return -ENODEV; | |
51a85faf BH |
2269 | break; |
2270 | case ACPI_TYPE_PROCESSOR: | |
778cbc1d BH |
2271 | *type = ACPI_BUS_TYPE_PROCESSOR; |
2272 | status = acpi_bus_get_status_handle(handle, sta); | |
2273 | if (ACPI_FAILURE(status)) | |
2274 | return -ENODEV; | |
51a85faf BH |
2275 | break; |
2276 | case ACPI_TYPE_THERMAL: | |
778cbc1d BH |
2277 | *type = ACPI_BUS_TYPE_THERMAL; |
2278 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
2279 | break; |
2280 | case ACPI_TYPE_POWER: | |
778cbc1d BH |
2281 | *type = ACPI_BUS_TYPE_POWER; |
2282 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
2283 | break; |
2284 | default: | |
778cbc1d | 2285 | return -ENODEV; |
51a85faf | 2286 | } |
1da177e4 | 2287 | |
778cbc1d BH |
2288 | return 0; |
2289 | } | |
2290 | ||
202317a5 RW |
2291 | bool acpi_device_is_present(struct acpi_device *adev) |
2292 | { | |
2293 | if (adev->status.present || adev->status.functional) | |
2294 | return true; | |
2295 | ||
2296 | adev->flags.initialized = false; | |
2297 | return false; | |
2298 | } | |
2299 | ||
4b59cc1f RW |
2300 | static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, |
2301 | char *idstr, | |
2302 | const struct acpi_device_id **matchid) | |
2303 | { | |
2304 | const struct acpi_device_id *devid; | |
2305 | ||
aca0a4eb RW |
2306 | if (handler->match) |
2307 | return handler->match(idstr, matchid); | |
2308 | ||
4b59cc1f RW |
2309 | for (devid = handler->ids; devid->id[0]; devid++) |
2310 | if (!strcmp((char *)devid->id, idstr)) { | |
2311 | if (matchid) | |
2312 | *matchid = devid; | |
2313 | ||
2314 | return true; | |
2315 | } | |
2316 | ||
2317 | return false; | |
2318 | } | |
2319 | ||
6b772e8f TK |
2320 | static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr, |
2321 | const struct acpi_device_id **matchid) | |
2322 | { | |
2323 | struct acpi_scan_handler *handler; | |
2324 | ||
2325 | list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) | |
2326 | if (acpi_scan_handler_matching(handler, idstr, matchid)) | |
2327 | return handler; | |
2328 | ||
2329 | return NULL; | |
2330 | } | |
2331 | ||
3f8055c3 RW |
2332 | void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) |
2333 | { | |
3f8055c3 RW |
2334 | if (!!hotplug->enabled == !!val) |
2335 | return; | |
2336 | ||
2337 | mutex_lock(&acpi_scan_lock); | |
2338 | ||
2339 | hotplug->enabled = val; | |
3f8055c3 RW |
2340 | |
2341 | mutex_unlock(&acpi_scan_lock); | |
2342 | } | |
2343 | ||
3c2cc7ff | 2344 | static void acpi_scan_init_hotplug(struct acpi_device *adev) |
a33ec399 | 2345 | { |
6b772e8f | 2346 | struct acpi_hardware_id *hwid; |
a33ec399 | 2347 | |
b43109fa | 2348 | if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) { |
1e2380cd RW |
2349 | acpi_dock_add(adev); |
2350 | return; | |
2351 | } | |
3c2cc7ff RW |
2352 | list_for_each_entry(hwid, &adev->pnp.ids, list) { |
2353 | struct acpi_scan_handler *handler; | |
a33ec399 | 2354 | |
6b772e8f | 2355 | handler = acpi_scan_match_handler(hwid->id, NULL); |
1a699476 RW |
2356 | if (handler) { |
2357 | adev->flags.hotplug_notify = true; | |
2358 | break; | |
2359 | } | |
3c2cc7ff | 2360 | } |
a33ec399 RW |
2361 | } |
2362 | ||
40e7fcb1 LT |
2363 | static void acpi_device_dep_initialize(struct acpi_device *adev) |
2364 | { | |
2365 | struct acpi_dep_data *dep; | |
2366 | struct acpi_handle_list dep_devices; | |
2367 | acpi_status status; | |
2368 | int i; | |
2369 | ||
2370 | if (!acpi_has_method(adev->handle, "_DEP")) | |
2371 | return; | |
2372 | ||
2373 | status = acpi_evaluate_reference(adev->handle, "_DEP", NULL, | |
2374 | &dep_devices); | |
2375 | if (ACPI_FAILURE(status)) { | |
80167a24 | 2376 | dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n"); |
40e7fcb1 LT |
2377 | return; |
2378 | } | |
2379 | ||
2380 | for (i = 0; i < dep_devices.count; i++) { | |
2381 | struct acpi_device_info *info; | |
2382 | int skip; | |
2383 | ||
2384 | status = acpi_get_object_info(dep_devices.handles[i], &info); | |
2385 | if (ACPI_FAILURE(status)) { | |
80167a24 | 2386 | dev_dbg(&adev->dev, "Error reading _DEP device info\n"); |
40e7fcb1 LT |
2387 | continue; |
2388 | } | |
2389 | ||
2390 | /* | |
2391 | * Skip the dependency of Windows System Power | |
2392 | * Management Controller | |
2393 | */ | |
2394 | skip = info->valid & ACPI_VALID_HID && | |
2395 | !strcmp(info->hardware_id.string, "INT3396"); | |
2396 | ||
2397 | kfree(info); | |
2398 | ||
2399 | if (skip) | |
2400 | continue; | |
2401 | ||
2402 | dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL); | |
2403 | if (!dep) | |
2404 | return; | |
2405 | ||
2406 | dep->master = dep_devices.handles[i]; | |
2407 | dep->slave = adev->handle; | |
2408 | adev->dep_unmet++; | |
2409 | ||
2410 | mutex_lock(&acpi_dep_list_lock); | |
2411 | list_add_tail(&dep->node , &acpi_dep_list); | |
2412 | mutex_unlock(&acpi_dep_list_lock); | |
2413 | } | |
2414 | } | |
2415 | ||
e3863094 RW |
2416 | static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, |
2417 | void *not_used, void **return_value) | |
778cbc1d | 2418 | { |
805d410f | 2419 | struct acpi_device *device = NULL; |
778cbc1d BH |
2420 | int type; |
2421 | unsigned long long sta; | |
2422 | int result; | |
2423 | ||
4002bf38 RW |
2424 | acpi_bus_get_device(handle, &device); |
2425 | if (device) | |
2426 | goto out; | |
2427 | ||
778cbc1d BH |
2428 | result = acpi_bus_type_and_status(handle, &type, &sta); |
2429 | if (result) | |
2430 | return AE_OK; | |
2431 | ||
82c7d5ef RW |
2432 | if (type == ACPI_BUS_TYPE_POWER) { |
2433 | acpi_add_power_resource(handle); | |
2434 | return AE_OK; | |
2435 | } | |
2436 | ||
2c0d4fe0 | 2437 | acpi_add_single_object(&device, handle, type, sta); |
e3b87f8a | 2438 | if (!device) |
51a85faf | 2439 | return AE_CTRL_DEPTH; |
1da177e4 | 2440 | |
3c2cc7ff | 2441 | acpi_scan_init_hotplug(device); |
40e7fcb1 | 2442 | acpi_device_dep_initialize(device); |
3c2cc7ff | 2443 | |
4002bf38 | 2444 | out: |
51a85faf BH |
2445 | if (!*return_value) |
2446 | *return_value = device; | |
805d410f | 2447 | |
51a85faf BH |
2448 | return AE_OK; |
2449 | } | |
3fb02738 | 2450 | |
48459340 ZR |
2451 | static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data) |
2452 | { | |
2453 | bool *is_spi_i2c_slave_p = data; | |
2454 | ||
2455 | if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) | |
2456 | return 1; | |
2457 | ||
2458 | /* | |
2459 | * devices that are connected to UART still need to be enumerated to | |
2460 | * platform bus | |
2461 | */ | |
2462 | if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART) | |
2463 | *is_spi_i2c_slave_p = true; | |
2464 | ||
2465 | /* no need to do more checking */ | |
2466 | return -1; | |
2467 | } | |
2468 | ||
2469 | static void acpi_default_enumeration(struct acpi_device *device) | |
2470 | { | |
2471 | struct list_head resource_list; | |
2472 | bool is_spi_i2c_slave = false; | |
2473 | ||
48459340 ZR |
2474 | /* |
2475 | * Do not enemerate SPI/I2C slaves as they will be enuerated by their | |
2476 | * respective parents. | |
2477 | */ | |
2478 | INIT_LIST_HEAD(&resource_list); | |
2479 | acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave, | |
2480 | &is_spi_i2c_slave); | |
2481 | acpi_dev_free_resource_list(&resource_list); | |
2482 | if (!is_spi_i2c_slave) | |
2483 | acpi_create_platform_device(device); | |
2484 | } | |
2485 | ||
7d284352 | 2486 | static const struct acpi_device_id generic_device_ids[] = { |
ee892094 | 2487 | {ACPI_DT_NAMESPACE_HID, }, |
7d284352 RW |
2488 | {"", }, |
2489 | }; | |
2490 | ||
2491 | static int acpi_generic_device_attach(struct acpi_device *adev, | |
2492 | const struct acpi_device_id *not_used) | |
2493 | { | |
2494 | /* | |
ee892094 RW |
2495 | * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test |
2496 | * below can be unconditional. | |
7d284352 RW |
2497 | */ |
2498 | if (adev->data.of_compatible) | |
2499 | acpi_default_enumeration(adev); | |
2500 | ||
2501 | return 1; | |
2502 | } | |
2503 | ||
2504 | static struct acpi_scan_handler generic_device_handler = { | |
2505 | .ids = generic_device_ids, | |
2506 | .attach = acpi_generic_device_attach, | |
2507 | }; | |
2508 | ||
c5698074 | 2509 | static int acpi_scan_attach_handler(struct acpi_device *device) |
ca589f94 | 2510 | { |
c5698074 RW |
2511 | struct acpi_hardware_id *hwid; |
2512 | int ret = 0; | |
ca589f94 | 2513 | |
c5698074 | 2514 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
87b85b3c | 2515 | const struct acpi_device_id *devid; |
c5698074 | 2516 | struct acpi_scan_handler *handler; |
ca589f94 | 2517 | |
c5698074 RW |
2518 | handler = acpi_scan_match_handler(hwid->id, &devid); |
2519 | if (handler) { | |
d34afa9d RW |
2520 | if (!handler->attach) { |
2521 | device->pnp.type.platform_id = 0; | |
2522 | continue; | |
2523 | } | |
9cb32acf | 2524 | device->handler = handler; |
87b85b3c | 2525 | ret = handler->attach(device, devid); |
9cb32acf | 2526 | if (ret > 0) |
c5698074 | 2527 | break; |
9cb32acf RW |
2528 | |
2529 | device->handler = NULL; | |
2530 | if (ret < 0) | |
c5698074 | 2531 | break; |
ca589f94 RW |
2532 | } |
2533 | } | |
48459340 | 2534 | |
ca589f94 RW |
2535 | return ret; |
2536 | } | |
2537 | ||
2c22e652 | 2538 | static void acpi_bus_attach(struct acpi_device *device) |
51a85faf | 2539 | { |
2c22e652 | 2540 | struct acpi_device *child; |
1e2380cd | 2541 | acpi_handle ejd; |
ca589f94 | 2542 | int ret; |
3fb02738 | 2543 | |
1e2380cd RW |
2544 | if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd))) |
2545 | register_dock_dependent_device(device, ejd); | |
2546 | ||
2c22e652 | 2547 | acpi_bus_get_status(device); |
202317a5 | 2548 | /* Skip devices that are not present. */ |
2c22e652 RW |
2549 | if (!acpi_device_is_present(device)) { |
2550 | device->flags.visited = false; | |
1b1f3e16 | 2551 | device->flags.power_manageable = 0; |
2c22e652 RW |
2552 | return; |
2553 | } | |
3a391a39 | 2554 | if (device->handler) |
2c22e652 | 2555 | goto ok; |
3a391a39 | 2556 | |
202317a5 | 2557 | if (!device->flags.initialized) { |
1b1f3e16 RW |
2558 | device->flags.power_manageable = |
2559 | device->power.states[ACPI_STATE_D0].flags.valid; | |
2560 | if (acpi_bus_init_power(device)) | |
2561 | device->flags.power_manageable = 0; | |
2562 | ||
202317a5 RW |
2563 | device->flags.initialized = true; |
2564 | } | |
2c22e652 | 2565 | device->flags.visited = false; |
ca589f94 | 2566 | ret = acpi_scan_attach_handler(device); |
6931007c | 2567 | if (ret < 0) |
2c22e652 | 2568 | return; |
6931007c RW |
2569 | |
2570 | device->flags.match_driver = true; | |
2c22e652 RW |
2571 | if (!ret) { |
2572 | ret = device_attach(&device->dev); | |
2573 | if (ret < 0) | |
2574 | return; | |
7d284352 RW |
2575 | |
2576 | if (!ret && device->pnp.type.platform_id) | |
2577 | acpi_default_enumeration(device); | |
2c22e652 | 2578 | } |
202317a5 | 2579 | device->flags.visited = true; |
202317a5 | 2580 | |
2c22e652 RW |
2581 | ok: |
2582 | list_for_each_entry(child, &device->children, node) | |
2583 | acpi_bus_attach(child); | |
8ab17fc9 RW |
2584 | |
2585 | if (device->handler && device->handler->hotplug.notify_online) | |
2586 | device->handler->hotplug.notify_online(device); | |
1da177e4 | 2587 | } |
1da177e4 | 2588 | |
40e7fcb1 LT |
2589 | void acpi_walk_dep_device_list(acpi_handle handle) |
2590 | { | |
2591 | struct acpi_dep_data *dep, *tmp; | |
2592 | struct acpi_device *adev; | |
2593 | ||
2594 | mutex_lock(&acpi_dep_list_lock); | |
2595 | list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) { | |
2596 | if (dep->master == handle) { | |
2597 | acpi_bus_get_device(dep->slave, &adev); | |
2598 | if (!adev) | |
2599 | continue; | |
2600 | ||
2601 | adev->dep_unmet--; | |
2602 | if (!adev->dep_unmet) | |
2603 | acpi_bus_attach(adev); | |
2604 | list_del(&dep->node); | |
2605 | kfree(dep); | |
2606 | } | |
2607 | } | |
2608 | mutex_unlock(&acpi_dep_list_lock); | |
2609 | } | |
2610 | EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list); | |
2611 | ||
636458de | 2612 | /** |
b8bd759a | 2613 | * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. |
636458de | 2614 | * @handle: Root of the namespace scope to scan. |
7779688f | 2615 | * |
636458de RW |
2616 | * Scan a given ACPI tree (probably recently hot-plugged) and create and add |
2617 | * found devices. | |
7779688f | 2618 | * |
636458de RW |
2619 | * If no devices were found, -ENODEV is returned, but it does not mean that |
2620 | * there has been a real error. There just have been no suitable ACPI objects | |
2621 | * in the table trunk from which the kernel could create a device and add an | |
2622 | * appropriate driver. | |
3757b948 RW |
2623 | * |
2624 | * Must be called under acpi_scan_lock. | |
7779688f | 2625 | */ |
b8bd759a | 2626 | int acpi_bus_scan(acpi_handle handle) |
3fb02738 | 2627 | { |
b8bd759a | 2628 | void *device = NULL; |
3fb02738 | 2629 | |
b8bd759a RW |
2630 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device))) |
2631 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
2632 | acpi_bus_check_add, NULL, NULL, &device); | |
3fb02738 | 2633 | |
2c22e652 RW |
2634 | if (device) { |
2635 | acpi_bus_attach(device); | |
2636 | return 0; | |
05404d8f | 2637 | } |
2c22e652 | 2638 | return -ENODEV; |
3fb02738 | 2639 | } |
2c22e652 | 2640 | EXPORT_SYMBOL(acpi_bus_scan); |
1da177e4 | 2641 | |
3757b948 | 2642 | /** |
2c22e652 RW |
2643 | * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects. |
2644 | * @adev: Root of the ACPI namespace scope to walk. | |
3757b948 RW |
2645 | * |
2646 | * Must be called under acpi_scan_lock. | |
2647 | */ | |
2c22e652 | 2648 | void acpi_bus_trim(struct acpi_device *adev) |
1da177e4 | 2649 | { |
2c22e652 RW |
2650 | struct acpi_scan_handler *handler = adev->handler; |
2651 | struct acpi_device *child; | |
2652 | ||
2653 | list_for_each_entry_reverse(child, &adev->children, node) | |
2654 | acpi_bus_trim(child); | |
2655 | ||
a951c773 | 2656 | adev->flags.match_driver = false; |
2c22e652 RW |
2657 | if (handler) { |
2658 | if (handler->detach) | |
2659 | handler->detach(adev); | |
2660 | ||
2661 | adev->handler = NULL; | |
2662 | } else { | |
2663 | device_release_driver(&adev->dev); | |
2664 | } | |
05404d8f | 2665 | /* |
2c22e652 RW |
2666 | * Most likely, the device is going away, so put it into D3cold before |
2667 | * that. | |
05404d8f | 2668 | */ |
2c22e652 RW |
2669 | acpi_device_set_power(adev, ACPI_STATE_D3_COLD); |
2670 | adev->flags.initialized = false; | |
2671 | adev->flags.visited = false; | |
1da177e4 | 2672 | } |
ceaba663 KA |
2673 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
2674 | ||
e8b945c9 | 2675 | static int acpi_bus_scan_fixed(void) |
1da177e4 | 2676 | { |
4be44fcd | 2677 | int result = 0; |
c4168bff | 2678 | |
1da177e4 LT |
2679 | /* |
2680 | * Enumerate all fixed-feature devices. | |
2681 | */ | |
2c0d4fe0 RW |
2682 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { |
2683 | struct acpi_device *device = NULL; | |
2684 | ||
5c478f49 | 2685 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2686 | ACPI_BUS_TYPE_POWER_BUTTON, |
2c0d4fe0 RW |
2687 | ACPI_STA_DEFAULT); |
2688 | if (result) | |
2689 | return result; | |
2690 | ||
88346167 | 2691 | device->flags.match_driver = true; |
2c0d4fe0 RW |
2692 | result = device_attach(&device->dev); |
2693 | if (result < 0) | |
2694 | return result; | |
2695 | ||
c10d7a13 | 2696 | device_init_wakeup(&device->dev, true); |
3fb02738 | 2697 | } |
1da177e4 | 2698 | |
2c0d4fe0 RW |
2699 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { |
2700 | struct acpi_device *device = NULL; | |
2701 | ||
5c478f49 | 2702 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2703 | ACPI_BUS_TYPE_SLEEP_BUTTON, |
2c0d4fe0 RW |
2704 | ACPI_STA_DEFAULT); |
2705 | if (result) | |
2706 | return result; | |
2707 | ||
88346167 | 2708 | device->flags.match_driver = true; |
2c0d4fe0 | 2709 | result = device_attach(&device->dev); |
3fb02738 | 2710 | } |
1da177e4 | 2711 | |
2c0d4fe0 | 2712 | return result < 0 ? result : 0; |
1da177e4 LT |
2713 | } |
2714 | ||
e747f274 | 2715 | int __init acpi_scan_init(void) |
1da177e4 LT |
2716 | { |
2717 | int result; | |
1da177e4 | 2718 | |
5b327265 PM |
2719 | result = bus_register(&acpi_bus_type); |
2720 | if (result) { | |
2721 | /* We don't want to quit even if we failed to add suspend/resume */ | |
2722 | printk(KERN_ERR PREFIX "Could not register bus type\n"); | |
2723 | } | |
2724 | ||
92ef2a25 | 2725 | acpi_pci_root_init(); |
4daeaf68 | 2726 | acpi_pci_link_init(); |
ac212b69 | 2727 | acpi_processor_init(); |
f58b082a | 2728 | acpi_lpss_init(); |
92082a88 | 2729 | acpi_apd_init(); |
2fa97feb | 2730 | acpi_cmos_rtc_init(); |
737f1a9f | 2731 | acpi_container_init(); |
0a347644 | 2732 | acpi_memory_hotplug_init(); |
eec15edb | 2733 | acpi_pnp_init(); |
3230bbfc | 2734 | acpi_int340x_thermal_init(); |
97d9a9e9 | 2735 | |
7d284352 RW |
2736 | acpi_scan_add_handler(&generic_device_handler); |
2737 | ||
3757b948 | 2738 | mutex_lock(&acpi_scan_lock); |
1da177e4 LT |
2739 | /* |
2740 | * Enumerate devices in the ACPI namespace. | |
2741 | */ | |
0cd6ac52 RW |
2742 | result = acpi_bus_scan(ACPI_ROOT_OBJECT); |
2743 | if (result) | |
3757b948 | 2744 | goto out; |
1da177e4 | 2745 | |
0cd6ac52 | 2746 | result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root); |
1da177e4 | 2747 | if (result) |
3757b948 | 2748 | goto out; |
1da177e4 | 2749 | |
2650ef42 AL |
2750 | /* Fixed feature devices do not exist on HW-reduced platform */ |
2751 | if (!acpi_gbl_reduced_hardware) { | |
2752 | result = acpi_bus_scan_fixed(); | |
2753 | if (result) { | |
2754 | acpi_detach_data(acpi_root->handle, | |
2755 | acpi_scan_drop_device); | |
2756 | acpi_device_del(acpi_root); | |
2757 | put_device(&acpi_root->dev); | |
2758 | goto out; | |
2759 | } | |
b8bd759a | 2760 | } |
1da177e4 | 2761 | |
b8bd759a | 2762 | acpi_update_all_gpes(); |
3757b948 RW |
2763 | |
2764 | out: | |
2765 | mutex_unlock(&acpi_scan_lock); | |
2766 | return result; | |
1da177e4 | 2767 | } |