1 /*
2 * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
3 *
4 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5 *
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or (at
11 * your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
19 */
20
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/ioport.h>
24 #include <linux/kernel.h>
25 #include <linux/list.h>
26 #include <linux/sched.h>
27 #include <linux/pm.h>
28 #include <linux/device.h>
29 #include <linux/proc_fs.h>
30 #include <linux/acpi.h>
31 #include <linux/slab.h>
32 #include <linux/regulator/machine.h>
33 #ifdef CONFIG_X86
34 #include <asm/mpspec.h>
35 #endif
36 #include <linux/pci.h>
37 #include <acpi/apei.h>
38 #include <linux/dmi.h>
39 #include <linux/suspend.h>
40
41 #include "internal.h"
42
43 #define _COMPONENT ACPI_BUS_COMPONENT
44 ACPI_MODULE_NAME("bus");
45
46 struct acpi_device *acpi_root;
47 struct proc_dir_entry *acpi_root_dir;
48 EXPORT_SYMBOL(acpi_root_dir);
49
50 #ifdef CONFIG_X86
51 #ifdef CONFIG_ACPI_CUSTOM_DSDT
set_copy_dsdt(const struct dmi_system_id * id)52 static inline int set_copy_dsdt(const struct dmi_system_id *id)
53 {
54 return 0;
55 }
56 #else
set_copy_dsdt(const struct dmi_system_id * id)57 static int set_copy_dsdt(const struct dmi_system_id *id)
58 {
59 printk(KERN_NOTICE "%s detected - "
60 "force copy of DSDT to local memory\n", id->ident);
61 acpi_gbl_copy_dsdt_locally = 1;
62 return 0;
63 }
64 #endif
65
66 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
67 /*
68 * Invoke DSDT corruption work-around on all Toshiba Satellite.
69 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
70 */
71 {
72 .callback = set_copy_dsdt,
73 .ident = "TOSHIBA Satellite",
74 .matches = {
75 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
76 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
77 },
78 },
79 {}
80 };
81 #else
82 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
83 {}
84 };
85 #endif
86
87 /* --------------------------------------------------------------------------
88 Device Management
89 -------------------------------------------------------------------------- */
90
acpi_bus_get_status_handle(acpi_handle handle,unsigned long long * sta)91 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
92 unsigned long long *sta)
93 {
94 acpi_status status;
95
96 status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
97 if (ACPI_SUCCESS(status))
98 return AE_OK;
99
100 if (status == AE_NOT_FOUND) {
101 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
102 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
103 return AE_OK;
104 }
105 return status;
106 }
107
acpi_bus_get_status(struct acpi_device * device)108 int acpi_bus_get_status(struct acpi_device *device)
109 {
110 acpi_status status;
111 unsigned long long sta;
112
113 status = acpi_bus_get_status_handle(device->handle, &sta);
114 if (ACPI_FAILURE(status))
115 return -ENODEV;
116
117 acpi_set_device_status(device, sta);
118
119 if (device->status.functional && !device->status.present) {
120 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
121 "functional but not present;\n",
122 device->pnp.bus_id, (u32)sta));
123 }
124
125 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
126 device->pnp.bus_id, (u32)sta));
127 return 0;
128 }
129 EXPORT_SYMBOL(acpi_bus_get_status);
130
acpi_bus_private_data_handler(acpi_handle handle,void * context)131 void acpi_bus_private_data_handler(acpi_handle handle,
132 void *context)
133 {
134 return;
135 }
136 EXPORT_SYMBOL(acpi_bus_private_data_handler);
137
acpi_bus_attach_private_data(acpi_handle handle,void * data)138 int acpi_bus_attach_private_data(acpi_handle handle, void *data)
139 {
140 acpi_status status;
141
142 status = acpi_attach_data(handle,
143 acpi_bus_private_data_handler, data);
144 if (ACPI_FAILURE(status)) {
145 acpi_handle_debug(handle, "Error attaching device data\n");
146 return -ENODEV;
147 }
148
149 return 0;
150 }
151 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
152
acpi_bus_get_private_data(acpi_handle handle,void ** data)153 int acpi_bus_get_private_data(acpi_handle handle, void **data)
154 {
155 acpi_status status;
156
157 if (!data)
158 return -EINVAL;
159
160 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
161 if (ACPI_FAILURE(status)) {
162 acpi_handle_debug(handle, "No context for object\n");
163 return -ENODEV;
164 }
165
166 return 0;
167 }
168 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
169
acpi_bus_detach_private_data(acpi_handle handle)170 void acpi_bus_detach_private_data(acpi_handle handle)
171 {
172 acpi_detach_data(handle, acpi_bus_private_data_handler);
173 }
174 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
175
acpi_print_osc_error(acpi_handle handle,struct acpi_osc_context * context,char * error)176 static void acpi_print_osc_error(acpi_handle handle,
177 struct acpi_osc_context *context, char *error)
178 {
179 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
180 int i;
181
182 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
183 printk(KERN_DEBUG "%s\n", error);
184 else {
185 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
186 kfree(buffer.pointer);
187 }
188 printk(KERN_DEBUG"_OSC request data:");
189 for (i = 0; i < context->cap.length; i += sizeof(u32))
190 printk("%x ", *((u32 *)(context->cap.pointer + i)));
191 printk("\n");
192 }
193
acpi_str_to_uuid(char * str,u8 * uuid)194 acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
195 {
196 int i;
197 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
198 24, 26, 28, 30, 32, 34};
199
200 if (strlen(str) != 36)
201 return AE_BAD_PARAMETER;
202 for (i = 0; i < 36; i++) {
203 if (i == 8 || i == 13 || i == 18 || i == 23) {
204 if (str[i] != '-')
205 return AE_BAD_PARAMETER;
206 } else if (!isxdigit(str[i]))
207 return AE_BAD_PARAMETER;
208 }
209 for (i = 0; i < 16; i++) {
210 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
211 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
212 }
213 return AE_OK;
214 }
215 EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
216
acpi_run_osc(acpi_handle handle,struct acpi_osc_context * context)217 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
218 {
219 acpi_status status;
220 struct acpi_object_list input;
221 union acpi_object in_params[4];
222 union acpi_object *out_obj;
223 u8 uuid[16];
224 u32 errors;
225 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
226
227 if (!context)
228 return AE_ERROR;
229 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
230 return AE_ERROR;
231 context->ret.length = ACPI_ALLOCATE_BUFFER;
232 context->ret.pointer = NULL;
233
234 /* Setting up input parameters */
235 input.count = 4;
236 input.pointer = in_params;
237 in_params[0].type = ACPI_TYPE_BUFFER;
238 in_params[0].buffer.length = 16;
239 in_params[0].buffer.pointer = uuid;
240 in_params[1].type = ACPI_TYPE_INTEGER;
241 in_params[1].integer.value = context->rev;
242 in_params[2].type = ACPI_TYPE_INTEGER;
243 in_params[2].integer.value = context->cap.length/sizeof(u32);
244 in_params[3].type = ACPI_TYPE_BUFFER;
245 in_params[3].buffer.length = context->cap.length;
246 in_params[3].buffer.pointer = context->cap.pointer;
247
248 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
249 if (ACPI_FAILURE(status))
250 return status;
251
252 if (!output.length)
253 return AE_NULL_OBJECT;
254
255 out_obj = output.pointer;
256 if (out_obj->type != ACPI_TYPE_BUFFER
257 || out_obj->buffer.length != context->cap.length) {
258 acpi_print_osc_error(handle, context,
259 "_OSC evaluation returned wrong type");
260 status = AE_TYPE;
261 goto out_kfree;
262 }
263 /* Need to ignore the bit0 in result code */
264 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
265 if (errors) {
266 if (errors & OSC_REQUEST_ERROR)
267 acpi_print_osc_error(handle, context,
268 "_OSC request failed");
269 if (errors & OSC_INVALID_UUID_ERROR)
270 acpi_print_osc_error(handle, context,
271 "_OSC invalid UUID");
272 if (errors & OSC_INVALID_REVISION_ERROR)
273 acpi_print_osc_error(handle, context,
274 "_OSC invalid revision");
275 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
276 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
277 & OSC_QUERY_ENABLE)
278 goto out_success;
279 status = AE_SUPPORT;
280 goto out_kfree;
281 }
282 status = AE_ERROR;
283 goto out_kfree;
284 }
285 out_success:
286 context->ret.length = out_obj->buffer.length;
287 context->ret.pointer = kmemdup(out_obj->buffer.pointer,
288 context->ret.length, GFP_KERNEL);
289 if (!context->ret.pointer) {
290 status = AE_NO_MEMORY;
291 goto out_kfree;
292 }
293 status = AE_OK;
294
295 out_kfree:
296 kfree(output.pointer);
297 if (status != AE_OK)
298 context->ret.pointer = NULL;
299 return status;
300 }
301 EXPORT_SYMBOL(acpi_run_osc);
302
303 bool osc_sb_apei_support_acked;
304 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
acpi_bus_osc_support(void)305 static void acpi_bus_osc_support(void)
306 {
307 u32 capbuf[2];
308 struct acpi_osc_context context = {
309 .uuid_str = sb_uuid_str,
310 .rev = 1,
311 .cap.length = 8,
312 .cap.pointer = capbuf,
313 };
314 acpi_handle handle;
315
316 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
317 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
318 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
319 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
320 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
321 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
322
323 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
324
325 if (!ghes_disable)
326 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
327 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
328 return;
329 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
330 u32 *capbuf_ret = context.ret.pointer;
331 if (context.ret.length > OSC_SUPPORT_DWORD)
332 osc_sb_apei_support_acked =
333 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
334 kfree(context.ret.pointer);
335 }
336 /* do we need to check other returned cap? Sounds no */
337 }
338
339 /* --------------------------------------------------------------------------
340 Notification Handling
341 -------------------------------------------------------------------------- */
342
343 /**
344 * acpi_bus_notify
345 * ---------------
346 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
347 */
acpi_bus_notify(acpi_handle handle,u32 type,void * data)348 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
349 {
350 struct acpi_device *adev;
351 struct acpi_driver *driver;
352 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
353 bool hotplug_event = false;
354
355 switch (type) {
356 case ACPI_NOTIFY_BUS_CHECK:
357 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
358 hotplug_event = true;
359 break;
360
361 case ACPI_NOTIFY_DEVICE_CHECK:
362 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
363 hotplug_event = true;
364 break;
365
366 case ACPI_NOTIFY_DEVICE_WAKE:
367 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
368 break;
369
370 case ACPI_NOTIFY_EJECT_REQUEST:
371 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
372 hotplug_event = true;
373 break;
374
375 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
376 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
377 /* TBD: Exactly what does 'light' mean? */
378 break;
379
380 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
381 acpi_handle_err(handle, "Device cannot be configured due "
382 "to a frequency mismatch\n");
383 break;
384
385 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
386 acpi_handle_err(handle, "Device cannot be configured due "
387 "to a bus mode mismatch\n");
388 break;
389
390 case ACPI_NOTIFY_POWER_FAULT:
391 acpi_handle_err(handle, "Device has suffered a power fault\n");
392 break;
393
394 default:
395 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
396 break;
397 }
398
399 adev = acpi_bus_get_acpi_device(handle);
400 if (!adev)
401 goto err;
402
403 driver = adev->driver;
404 if (driver && driver->ops.notify &&
405 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
406 driver->ops.notify(adev, type);
407
408 if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
409 return;
410
411 acpi_bus_put_acpi_device(adev);
412 return;
413
414 err:
415 acpi_evaluate_ost(handle, type, ost_code, NULL);
416 }
417
acpi_device_notify(acpi_handle handle,u32 event,void * data)418 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
419 {
420 struct acpi_device *device = data;
421
422 device->driver->ops.notify(device, event);
423 }
424
acpi_device_notify_fixed(void * data)425 static void acpi_device_notify_fixed(void *data)
426 {
427 struct acpi_device *device = data;
428
429 /* Fixed hardware devices have no handles */
430 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
431 }
432
acpi_device_fixed_event(void * data)433 static u32 acpi_device_fixed_event(void *data)
434 {
435 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
436 return ACPI_INTERRUPT_HANDLED;
437 }
438
acpi_device_install_notify_handler(struct acpi_device * device)439 static int acpi_device_install_notify_handler(struct acpi_device *device)
440 {
441 acpi_status status;
442
443 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
444 status =
445 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
446 acpi_device_fixed_event,
447 device);
448 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
449 status =
450 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
451 acpi_device_fixed_event,
452 device);
453 else
454 status = acpi_install_notify_handler(device->handle,
455 ACPI_DEVICE_NOTIFY,
456 acpi_device_notify,
457 device);
458
459 if (ACPI_FAILURE(status))
460 return -EINVAL;
461 return 0;
462 }
463
acpi_device_remove_notify_handler(struct acpi_device * device)464 static void acpi_device_remove_notify_handler(struct acpi_device *device)
465 {
466 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
467 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
468 acpi_device_fixed_event);
469 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
470 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
471 acpi_device_fixed_event);
472 else
473 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
474 acpi_device_notify);
475 }
476
477 /* --------------------------------------------------------------------------
478 Device Matching
479 -------------------------------------------------------------------------- */
480
acpi_primary_dev_companion(struct acpi_device * adev,const struct device * dev)481 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
482 const struct device *dev)
483 {
484 struct mutex *physical_node_lock = &adev->physical_node_lock;
485
486 mutex_lock(physical_node_lock);
487 if (list_empty(&adev->physical_node_list)) {
488 adev = NULL;
489 } else {
490 const struct acpi_device_physical_node *node;
491
492 node = list_first_entry(&adev->physical_node_list,
493 struct acpi_device_physical_node, node);
494 if (node->dev != dev)
495 adev = NULL;
496 }
497 mutex_unlock(physical_node_lock);
498 return adev;
499 }
500
501 /**
502 * acpi_device_is_first_physical_node - Is given dev first physical node
503 * @adev: ACPI companion device
504 * @dev: Physical device to check
505 *
506 * Function checks if given @dev is the first physical devices attached to
507 * the ACPI companion device. This distinction is needed in some cases
508 * where the same companion device is shared between many physical devices.
509 *
510 * Note that the caller have to provide valid @adev pointer.
511 */
acpi_device_is_first_physical_node(struct acpi_device * adev,const struct device * dev)512 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
513 const struct device *dev)
514 {
515 return !!acpi_primary_dev_companion(adev, dev);
516 }
517
518 /*
519 * acpi_companion_match() - Can we match via ACPI companion device
520 * @dev: Device in question
521 *
522 * Check if the given device has an ACPI companion and if that companion has
523 * a valid list of PNP IDs, and if the device is the first (primary) physical
524 * device associated with it. Return the companion pointer if that's the case
525 * or NULL otherwise.
526 *
527 * If multiple physical devices are attached to a single ACPI companion, we need
528 * to be careful. The usage scenario for this kind of relationship is that all
529 * of the physical devices in question use resources provided by the ACPI
530 * companion. A typical case is an MFD device where all the sub-devices share
531 * the parent's ACPI companion. In such cases we can only allow the primary
532 * (first) physical device to be matched with the help of the companion's PNP
533 * IDs.
534 *
535 * Additional physical devices sharing the ACPI companion can still use
536 * resources available from it but they will be matched normally using functions
537 * provided by their bus types (and analogously for their modalias).
538 */
acpi_companion_match(const struct device * dev)539 struct acpi_device *acpi_companion_match(const struct device *dev)
540 {
541 struct acpi_device *adev;
542
543 adev = ACPI_COMPANION(dev);
544 if (!adev)
545 return NULL;
546
547 if (list_empty(&adev->pnp.ids))
548 return NULL;
549
550 return acpi_primary_dev_companion(adev, dev);
551 }
552
553 /**
554 * acpi_of_match_device - Match device object using the "compatible" property.
555 * @adev: ACPI device object to match.
556 * @of_match_table: List of device IDs to match against.
557 *
558 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
559 * identifiers and a _DSD object with the "compatible" property, use that
560 * property to match against the given list of identifiers.
561 */
acpi_of_match_device(struct acpi_device * adev,const struct of_device_id * of_match_table)562 static bool acpi_of_match_device(struct acpi_device *adev,
563 const struct of_device_id *of_match_table)
564 {
565 const union acpi_object *of_compatible, *obj;
566 int i, nval;
567
568 if (!adev)
569 return false;
570
571 of_compatible = adev->data.of_compatible;
572 if (!of_match_table || !of_compatible)
573 return false;
574
575 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
576 nval = of_compatible->package.count;
577 obj = of_compatible->package.elements;
578 } else { /* Must be ACPI_TYPE_STRING. */
579 nval = 1;
580 obj = of_compatible;
581 }
582 /* Now we can look for the driver DT compatible strings */
583 for (i = 0; i < nval; i++, obj++) {
584 const struct of_device_id *id;
585
586 for (id = of_match_table; id->compatible[0]; id++)
587 if (!strcasecmp(obj->string.pointer, id->compatible))
588 return true;
589 }
590
591 return false;
592 }
593
__acpi_match_device_cls(const struct acpi_device_id * id,struct acpi_hardware_id * hwid)594 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
595 struct acpi_hardware_id *hwid)
596 {
597 int i, msk, byte_shift;
598 char buf[3];
599
600 if (!id->cls)
601 return false;
602
603 /* Apply class-code bitmask, before checking each class-code byte */
604 for (i = 1; i <= 3; i++) {
605 byte_shift = 8 * (3 - i);
606 msk = (id->cls_msk >> byte_shift) & 0xFF;
607 if (!msk)
608 continue;
609
610 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
611 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
612 return false;
613 }
614 return true;
615 }
616
__acpi_match_device(struct acpi_device * device,const struct acpi_device_id * ids,const struct of_device_id * of_ids)617 static const struct acpi_device_id *__acpi_match_device(
618 struct acpi_device *device,
619 const struct acpi_device_id *ids,
620 const struct of_device_id *of_ids)
621 {
622 const struct acpi_device_id *id;
623 struct acpi_hardware_id *hwid;
624
625 /*
626 * If the device is not present, it is unnecessary to load device
627 * driver for it.
628 */
629 if (!device || !device->status.present)
630 return NULL;
631
632 list_for_each_entry(hwid, &device->pnp.ids, list) {
633 /* First, check the ACPI/PNP IDs provided by the caller. */
634 for (id = ids; id->id[0] || id->cls; id++) {
635 if (id->id[0] && !strcmp((char *) id->id, hwid->id))
636 return id;
637 else if (id->cls && __acpi_match_device_cls(id, hwid))
638 return id;
639 }
640
641 /*
642 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
643 * "compatible" property if found.
644 *
645 * The id returned by the below is not valid, but the only
646 * caller passing non-NULL of_ids here is only interested in
647 * whether or not the return value is NULL.
648 */
649 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)
650 && acpi_of_match_device(device, of_ids))
651 return id;
652 }
653 return NULL;
654 }
655
656 /**
657 * acpi_match_device - Match a struct device against a given list of ACPI IDs
658 * @ids: Array of struct acpi_device_id object to match against.
659 * @dev: The device structure to match.
660 *
661 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
662 * object for that handle and use that object to match against a given list of
663 * device IDs.
664 *
665 * Return a pointer to the first matching ID on success or %NULL on failure.
666 */
acpi_match_device(const struct acpi_device_id * ids,const struct device * dev)667 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
668 const struct device *dev)
669 {
670 return __acpi_match_device(acpi_companion_match(dev), ids, NULL);
671 }
672 EXPORT_SYMBOL_GPL(acpi_match_device);
673
acpi_match_device_ids(struct acpi_device * device,const struct acpi_device_id * ids)674 int acpi_match_device_ids(struct acpi_device *device,
675 const struct acpi_device_id *ids)
676 {
677 return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT;
678 }
679 EXPORT_SYMBOL(acpi_match_device_ids);
680
acpi_driver_match_device(struct device * dev,const struct device_driver * drv)681 bool acpi_driver_match_device(struct device *dev,
682 const struct device_driver *drv)
683 {
684 if (!drv->acpi_match_table)
685 return acpi_of_match_device(ACPI_COMPANION(dev),
686 drv->of_match_table);
687
688 return !!__acpi_match_device(acpi_companion_match(dev),
689 drv->acpi_match_table, drv->of_match_table);
690 }
691 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
692
693 /* --------------------------------------------------------------------------
694 ACPI Driver Management
695 -------------------------------------------------------------------------- */
696
697 /**
698 * acpi_bus_register_driver - register a driver with the ACPI bus
699 * @driver: driver being registered
700 *
701 * Registers a driver with the ACPI bus. Searches the namespace for all
702 * devices that match the driver's criteria and binds. Returns zero for
703 * success or a negative error status for failure.
704 */
acpi_bus_register_driver(struct acpi_driver * driver)705 int acpi_bus_register_driver(struct acpi_driver *driver)
706 {
707 int ret;
708
709 if (acpi_disabled)
710 return -ENODEV;
711 driver->drv.name = driver->name;
712 driver->drv.bus = &acpi_bus_type;
713 driver->drv.owner = driver->owner;
714
715 ret = driver_register(&driver->drv);
716 return ret;
717 }
718
719 EXPORT_SYMBOL(acpi_bus_register_driver);
720
721 /**
722 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
723 * @driver: driver to unregister
724 *
725 * Unregisters a driver with the ACPI bus. Searches the namespace for all
726 * devices that match the driver's criteria and unbinds.
727 */
acpi_bus_unregister_driver(struct acpi_driver * driver)728 void acpi_bus_unregister_driver(struct acpi_driver *driver)
729 {
730 driver_unregister(&driver->drv);
731 }
732
733 EXPORT_SYMBOL(acpi_bus_unregister_driver);
734
735 /* --------------------------------------------------------------------------
736 ACPI Bus operations
737 -------------------------------------------------------------------------- */
738
acpi_bus_match(struct device * dev,struct device_driver * drv)739 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
740 {
741 struct acpi_device *acpi_dev = to_acpi_device(dev);
742 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
743
744 return acpi_dev->flags.match_driver
745 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
746 }
747
acpi_device_uevent(struct device * dev,struct kobj_uevent_env * env)748 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
749 {
750 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
751 }
752
acpi_device_probe(struct device * dev)753 static int acpi_device_probe(struct device *dev)
754 {
755 struct acpi_device *acpi_dev = to_acpi_device(dev);
756 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
757 int ret;
758
759 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
760 return -EINVAL;
761
762 if (!acpi_drv->ops.add)
763 return -ENOSYS;
764
765 ret = acpi_drv->ops.add(acpi_dev);
766 if (ret)
767 return ret;
768
769 acpi_dev->driver = acpi_drv;
770 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
771 "Driver [%s] successfully bound to device [%s]\n",
772 acpi_drv->name, acpi_dev->pnp.bus_id));
773
774 if (acpi_drv->ops.notify) {
775 ret = acpi_device_install_notify_handler(acpi_dev);
776 if (ret) {
777 if (acpi_drv->ops.remove)
778 acpi_drv->ops.remove(acpi_dev);
779
780 acpi_dev->driver = NULL;
781 acpi_dev->driver_data = NULL;
782 return ret;
783 }
784 }
785
786 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
787 acpi_drv->name, acpi_dev->pnp.bus_id));
788 get_device(dev);
789 return 0;
790 }
791
acpi_device_remove(struct device * dev)792 static int acpi_device_remove(struct device * dev)
793 {
794 struct acpi_device *acpi_dev = to_acpi_device(dev);
795 struct acpi_driver *acpi_drv = acpi_dev->driver;
796
797 if (acpi_drv) {
798 if (acpi_drv->ops.notify)
799 acpi_device_remove_notify_handler(acpi_dev);
800 if (acpi_drv->ops.remove)
801 acpi_drv->ops.remove(acpi_dev);
802 }
803 acpi_dev->driver = NULL;
804 acpi_dev->driver_data = NULL;
805
806 put_device(dev);
807 return 0;
808 }
809
810 struct bus_type acpi_bus_type = {
811 .name = "acpi",
812 .match = acpi_bus_match,
813 .probe = acpi_device_probe,
814 .remove = acpi_device_remove,
815 .uevent = acpi_device_uevent,
816 };
817
818 /* --------------------------------------------------------------------------
819 Initialization/Cleanup
820 -------------------------------------------------------------------------- */
821
acpi_bus_init_irq(void)822 static int __init acpi_bus_init_irq(void)
823 {
824 acpi_status status;
825 char *message = NULL;
826
827
828 /*
829 * Let the system know what interrupt model we are using by
830 * evaluating the \_PIC object, if exists.
831 */
832
833 switch (acpi_irq_model) {
834 case ACPI_IRQ_MODEL_PIC:
835 message = "PIC";
836 break;
837 case ACPI_IRQ_MODEL_IOAPIC:
838 message = "IOAPIC";
839 break;
840 case ACPI_IRQ_MODEL_IOSAPIC:
841 message = "IOSAPIC";
842 break;
843 case ACPI_IRQ_MODEL_GIC:
844 message = "GIC";
845 break;
846 case ACPI_IRQ_MODEL_PLATFORM:
847 message = "platform specific model";
848 break;
849 default:
850 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
851 return -ENODEV;
852 }
853
854 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
855
856 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
857 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
858 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
859 return -ENODEV;
860 }
861
862 return 0;
863 }
864
865 /**
866 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
867 *
868 * The ACPI tables are accessible after this, but the handling of events has not
869 * been initialized and the global lock is not available yet, so AML should not
870 * be executed at this point.
871 *
872 * Doing this before switching the EFI runtime services to virtual mode allows
873 * the EfiBootServices memory to be freed slightly earlier on boot.
874 */
acpi_early_init(void)875 void __init acpi_early_init(void)
876 {
877 acpi_status status;
878
879 if (acpi_disabled)
880 return;
881
882 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
883
884 /* It's safe to verify table checksums during late stage */
885 acpi_gbl_verify_table_checksum = TRUE;
886
887 /* enable workarounds, unless strict ACPI spec. compliance */
888 if (!acpi_strict)
889 acpi_gbl_enable_interpreter_slack = TRUE;
890
891 acpi_gbl_permanent_mmap = 1;
892
893 /*
894 * If the machine falls into the DMI check table,
895 * DSDT will be copied to memory
896 */
897 dmi_check_system(dsdt_dmi_table);
898
899 status = acpi_reallocate_root_table();
900 if (ACPI_FAILURE(status)) {
901 printk(KERN_ERR PREFIX
902 "Unable to reallocate ACPI tables\n");
903 goto error0;
904 }
905
906 status = acpi_initialize_subsystem();
907 if (ACPI_FAILURE(status)) {
908 printk(KERN_ERR PREFIX
909 "Unable to initialize the ACPI Interpreter\n");
910 goto error0;
911 }
912
913 status = acpi_load_tables();
914 if (ACPI_FAILURE(status)) {
915 printk(KERN_ERR PREFIX
916 "Unable to load the System Description Tables\n");
917 goto error0;
918 }
919
920 #ifdef CONFIG_X86
921 if (!acpi_ioapic) {
922 /* compatible (0) means level (3) */
923 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
924 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
925 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
926 }
927 /* Set PIC-mode SCI trigger type */
928 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
929 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
930 } else {
931 /*
932 * now that acpi_gbl_FADT is initialized,
933 * update it with result from INT_SRC_OVR parsing
934 */
935 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
936 }
937 #endif
938 return;
939
940 error0:
941 disable_acpi();
942 }
943
944 /**
945 * acpi_subsystem_init - Finalize the early initialization of ACPI.
946 *
947 * Switch over the platform to the ACPI mode (if possible), initialize the
948 * handling of ACPI events, install the interrupt and global lock handlers.
949 *
950 * Doing this too early is generally unsafe, but at the same time it needs to be
951 * done before all things that really depend on ACPI. The right spot appears to
952 * be before finalizing the EFI initialization.
953 */
acpi_subsystem_init(void)954 void __init acpi_subsystem_init(void)
955 {
956 acpi_status status;
957
958 if (acpi_disabled)
959 return;
960
961 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
962 if (ACPI_FAILURE(status)) {
963 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
964 disable_acpi();
965 } else {
966 /*
967 * If the system is using ACPI then we can be reasonably
968 * confident that any regulators are managed by the firmware
969 * so tell the regulator core it has everything it needs to
970 * know.
971 */
972 regulator_has_full_constraints();
973 }
974 }
975
acpi_bus_init(void)976 static int __init acpi_bus_init(void)
977 {
978 int result;
979 acpi_status status;
980
981 acpi_os_initialize1();
982
983 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
984 if (ACPI_FAILURE(status)) {
985 printk(KERN_ERR PREFIX
986 "Unable to start the ACPI Interpreter\n");
987 goto error1;
988 }
989
990 /*
991 * ACPI 2.0 requires the EC driver to be loaded and work before
992 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
993 * is called).
994 *
995 * This is accomplished by looking for the ECDT table, and getting
996 * the EC parameters out of that.
997 */
998 status = acpi_ec_ecdt_probe();
999 /* Ignore result. Not having an ECDT is not fatal. */
1000
1001 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1002 if (ACPI_FAILURE(status)) {
1003 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1004 goto error1;
1005 }
1006
1007 /* Set capability bits for _OSC under processor scope */
1008 acpi_early_processor_osc();
1009
1010 /*
1011 * _OSC method may exist in module level code,
1012 * so it must be run after ACPI_FULL_INITIALIZATION
1013 */
1014 acpi_bus_osc_support();
1015
1016 /*
1017 * _PDC control method may load dynamic SSDT tables,
1018 * and we need to install the table handler before that.
1019 */
1020 acpi_sysfs_init();
1021
1022 acpi_early_processor_set_pdc();
1023
1024 /*
1025 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1026 * is necessary to enable it as early as possible.
1027 */
1028 acpi_boot_ec_enable();
1029
1030 printk(KERN_INFO PREFIX "Interpreter enabled\n");
1031
1032 /* Initialize sleep structures */
1033 acpi_sleep_init();
1034
1035 /*
1036 * Get the system interrupt model and evaluate \_PIC.
1037 */
1038 result = acpi_bus_init_irq();
1039 if (result)
1040 goto error1;
1041
1042 /*
1043 * Register the for all standard device notifications.
1044 */
1045 status =
1046 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1047 &acpi_bus_notify, NULL);
1048 if (ACPI_FAILURE(status)) {
1049 printk(KERN_ERR PREFIX
1050 "Unable to register for device notifications\n");
1051 goto error1;
1052 }
1053
1054 /*
1055 * Create the top ACPI proc directory
1056 */
1057 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1058
1059 result = bus_register(&acpi_bus_type);
1060 if (!result)
1061 return 0;
1062
1063 /* Mimic structured exception handling */
1064 error1:
1065 acpi_terminate();
1066 return -ENODEV;
1067 }
1068
1069 struct kobject *acpi_kobj;
1070 EXPORT_SYMBOL_GPL(acpi_kobj);
1071
acpi_init(void)1072 static int __init acpi_init(void)
1073 {
1074 int result;
1075
1076 if (acpi_disabled) {
1077 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1078 return -ENODEV;
1079 }
1080
1081 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1082 if (!acpi_kobj) {
1083 printk(KERN_WARNING "%s: kset create error\n", __func__);
1084 acpi_kobj = NULL;
1085 }
1086
1087 init_acpi_device_notify();
1088 result = acpi_bus_init();
1089 if (result) {
1090 kobject_put(acpi_kobj);
1091 disable_acpi();
1092 return result;
1093 }
1094
1095 pci_mmcfg_late_init();
1096 acpi_scan_init();
1097 acpi_ec_init();
1098 acpi_debugfs_init();
1099 acpi_sleep_proc_init();
1100 acpi_wakeup_device_init();
1101 return 0;
1102 }
1103
1104 subsys_initcall(acpi_init);
1105