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microblaze: generic atomic64 support
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / osl.c
1 /*
2 * acpi_osl.c - OS-dependent functions ($Revision: 83 $)
3 *
4 * Copyright (C) 2000 Andrew Henroid
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * Copyright (c) 2008 Intel Corporation
8 * Author: Matthew Wilcox <willy@linux.intel.com>
9 *
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 *
28 */
29
30 #include <linux/module.h>
31 #include <linux/kernel.h>
32 #include <linux/slab.h>
33 #include <linux/mm.h>
34 #include <linux/pci.h>
35 #include <linux/interrupt.h>
36 #include <linux/kmod.h>
37 #include <linux/delay.h>
38 #include <linux/workqueue.h>
39 #include <linux/nmi.h>
40 #include <linux/acpi.h>
41 #include <linux/acpi_io.h>
42 #include <linux/efi.h>
43 #include <linux/ioport.h>
44 #include <linux/list.h>
45 #include <linux/jiffies.h>
46 #include <linux/semaphore.h>
47
48 #include <asm/io.h>
49 #include <asm/uaccess.h>
50
51 #include <acpi/acpi.h>
52 #include <acpi/acpi_bus.h>
53 #include <acpi/processor.h>
54
55 #define _COMPONENT ACPI_OS_SERVICES
56 ACPI_MODULE_NAME("osl");
57 #define PREFIX "ACPI: "
58 struct acpi_os_dpc {
59 acpi_osd_exec_callback function;
60 void *context;
61 struct work_struct work;
62 int wait;
63 };
64
65 #ifdef CONFIG_ACPI_CUSTOM_DSDT
66 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
67 #endif
68
69 #ifdef ENABLE_DEBUGGER
70 #include <linux/kdb.h>
71
72 /* stuff for debugger support */
73 int acpi_in_debugger;
74 EXPORT_SYMBOL(acpi_in_debugger);
75
76 extern char line_buf[80];
77 #endif /*ENABLE_DEBUGGER */
78
79 static acpi_osd_handler acpi_irq_handler;
80 static void *acpi_irq_context;
81 static struct workqueue_struct *kacpid_wq;
82 static struct workqueue_struct *kacpi_notify_wq;
83 struct workqueue_struct *kacpi_hotplug_wq;
84 EXPORT_SYMBOL(kacpi_hotplug_wq);
85
86 /*
87 * This list of permanent mappings is for memory that may be accessed from
88 * interrupt context, where we can't do the ioremap().
89 */
90 struct acpi_ioremap {
91 struct list_head list;
92 void __iomem *virt;
93 acpi_physical_address phys;
94 acpi_size size;
95 unsigned long refcount;
96 };
97
98 static LIST_HEAD(acpi_ioremaps);
99 static DEFINE_MUTEX(acpi_ioremap_lock);
100
101 static void __init acpi_osi_setup_late(void);
102
103 /*
104 * The story of _OSI(Linux)
105 *
106 * From pre-history through Linux-2.6.22,
107 * Linux responded TRUE upon a BIOS OSI(Linux) query.
108 *
109 * Unfortunately, reference BIOS writers got wind of this
110 * and put OSI(Linux) in their example code, quickly exposing
111 * this string as ill-conceived and opening the door to
112 * an un-bounded number of BIOS incompatibilities.
113 *
114 * For example, OSI(Linux) was used on resume to re-POST a
115 * video card on one system, because Linux at that time
116 * could not do a speedy restore in its native driver.
117 * But then upon gaining quick native restore capability,
118 * Linux has no way to tell the BIOS to skip the time-consuming
119 * POST -- putting Linux at a permanent performance disadvantage.
120 * On another system, the BIOS writer used OSI(Linux)
121 * to infer native OS support for IPMI! On other systems,
122 * OSI(Linux) simply got in the way of Linux claiming to
123 * be compatible with other operating systems, exposing
124 * BIOS issues such as skipped device initialization.
125 *
126 * So "Linux" turned out to be a really poor chose of
127 * OSI string, and from Linux-2.6.23 onward we respond FALSE.
128 *
129 * BIOS writers should NOT query _OSI(Linux) on future systems.
130 * Linux will complain on the console when it sees it, and return FALSE.
131 * To get Linux to return TRUE for your system will require
132 * a kernel source update to add a DMI entry,
133 * or boot with "acpi_osi=Linux"
134 */
135
136 static struct osi_linux {
137 unsigned int enable:1;
138 unsigned int dmi:1;
139 unsigned int cmdline:1;
140 } osi_linux = {0, 0, 0};
141
142 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
143 {
144 if (!strcmp("Linux", interface)) {
145
146 printk_once(KERN_NOTICE FW_BUG PREFIX
147 "BIOS _OSI(Linux) query %s%s\n",
148 osi_linux.enable ? "honored" : "ignored",
149 osi_linux.cmdline ? " via cmdline" :
150 osi_linux.dmi ? " via DMI" : "");
151 }
152
153 return supported;
154 }
155
156 static void __init acpi_request_region (struct acpi_generic_address *gas,
157 unsigned int length, char *desc)
158 {
159 u64 addr;
160
161 /* Handle possible alignment issues */
162 memcpy(&addr, &gas->address, sizeof(addr));
163 if (!addr || !length)
164 return;
165
166 /* Resources are never freed */
167 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
168 request_region(addr, length, desc);
169 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
170 request_mem_region(addr, length, desc);
171 }
172
173 static int __init acpi_reserve_resources(void)
174 {
175 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
176 "ACPI PM1a_EVT_BLK");
177
178 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
179 "ACPI PM1b_EVT_BLK");
180
181 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
182 "ACPI PM1a_CNT_BLK");
183
184 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
185 "ACPI PM1b_CNT_BLK");
186
187 if (acpi_gbl_FADT.pm_timer_length == 4)
188 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
189
190 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
191 "ACPI PM2_CNT_BLK");
192
193 /* Length of GPE blocks must be a non-negative multiple of 2 */
194
195 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
196 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
197 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
198
199 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
200 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
201 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
202
203 return 0;
204 }
205 device_initcall(acpi_reserve_resources);
206
207 void acpi_os_printf(const char *fmt, ...)
208 {
209 va_list args;
210 va_start(args, fmt);
211 acpi_os_vprintf(fmt, args);
212 va_end(args);
213 }
214
215 void acpi_os_vprintf(const char *fmt, va_list args)
216 {
217 static char buffer[512];
218
219 vsprintf(buffer, fmt, args);
220
221 #ifdef ENABLE_DEBUGGER
222 if (acpi_in_debugger) {
223 kdb_printf("%s", buffer);
224 } else {
225 printk(KERN_CONT "%s", buffer);
226 }
227 #else
228 printk(KERN_CONT "%s", buffer);
229 #endif
230 }
231
232 #ifdef CONFIG_KEXEC
233 static unsigned long acpi_rsdp;
234 static int __init setup_acpi_rsdp(char *arg)
235 {
236 acpi_rsdp = simple_strtoul(arg, NULL, 16);
237 return 0;
238 }
239 early_param("acpi_rsdp", setup_acpi_rsdp);
240 #endif
241
242 acpi_physical_address __init acpi_os_get_root_pointer(void)
243 {
244 #ifdef CONFIG_KEXEC
245 if (acpi_rsdp)
246 return acpi_rsdp;
247 #endif
248
249 if (efi_enabled) {
250 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
251 return efi.acpi20;
252 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
253 return efi.acpi;
254 else {
255 printk(KERN_ERR PREFIX
256 "System description tables not found\n");
257 return 0;
258 }
259 } else {
260 acpi_physical_address pa = 0;
261
262 acpi_find_root_pointer(&pa);
263 return pa;
264 }
265 }
266
267 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
268 static struct acpi_ioremap *
269 acpi_map_lookup(acpi_physical_address phys, acpi_size size)
270 {
271 struct acpi_ioremap *map;
272
273 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
274 if (map->phys <= phys &&
275 phys + size <= map->phys + map->size)
276 return map;
277
278 return NULL;
279 }
280
281 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
282 static void __iomem *
283 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
284 {
285 struct acpi_ioremap *map;
286
287 map = acpi_map_lookup(phys, size);
288 if (map)
289 return map->virt + (phys - map->phys);
290
291 return NULL;
292 }
293
294 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
295 {
296 struct acpi_ioremap *map;
297 void __iomem *virt = NULL;
298
299 mutex_lock(&acpi_ioremap_lock);
300 map = acpi_map_lookup(phys, size);
301 if (map) {
302 virt = map->virt + (phys - map->phys);
303 map->refcount++;
304 }
305 mutex_unlock(&acpi_ioremap_lock);
306 return virt;
307 }
308 EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
309
310 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
311 static struct acpi_ioremap *
312 acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
313 {
314 struct acpi_ioremap *map;
315
316 list_for_each_entry_rcu(map, &acpi_ioremaps, list)
317 if (map->virt <= virt &&
318 virt + size <= map->virt + map->size)
319 return map;
320
321 return NULL;
322 }
323
324 void __iomem *__init_refok
325 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
326 {
327 struct acpi_ioremap *map;
328 void __iomem *virt;
329 acpi_physical_address pg_off;
330 acpi_size pg_sz;
331
332 if (phys > ULONG_MAX) {
333 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
334 return NULL;
335 }
336
337 if (!acpi_gbl_permanent_mmap)
338 return __acpi_map_table((unsigned long)phys, size);
339
340 mutex_lock(&acpi_ioremap_lock);
341 /* Check if there's a suitable mapping already. */
342 map = acpi_map_lookup(phys, size);
343 if (map) {
344 map->refcount++;
345 goto out;
346 }
347
348 map = kzalloc(sizeof(*map), GFP_KERNEL);
349 if (!map) {
350 mutex_unlock(&acpi_ioremap_lock);
351 return NULL;
352 }
353
354 pg_off = round_down(phys, PAGE_SIZE);
355 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
356 virt = acpi_os_ioremap(pg_off, pg_sz);
357 if (!virt) {
358 mutex_unlock(&acpi_ioremap_lock);
359 kfree(map);
360 return NULL;
361 }
362
363 INIT_LIST_HEAD(&map->list);
364 map->virt = virt;
365 map->phys = pg_off;
366 map->size = pg_sz;
367 map->refcount = 1;
368
369 list_add_tail_rcu(&map->list, &acpi_ioremaps);
370
371 out:
372 mutex_unlock(&acpi_ioremap_lock);
373 return map->virt + (phys - map->phys);
374 }
375 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
376
377 static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
378 {
379 if (!--map->refcount)
380 list_del_rcu(&map->list);
381 }
382
383 static void acpi_os_map_cleanup(struct acpi_ioremap *map)
384 {
385 if (!map->refcount) {
386 synchronize_rcu();
387 iounmap(map->virt);
388 kfree(map);
389 }
390 }
391
392 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
393 {
394 struct acpi_ioremap *map;
395
396 if (!acpi_gbl_permanent_mmap) {
397 __acpi_unmap_table(virt, size);
398 return;
399 }
400
401 mutex_lock(&acpi_ioremap_lock);
402 map = acpi_map_lookup_virt(virt, size);
403 if (!map) {
404 mutex_unlock(&acpi_ioremap_lock);
405 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
406 return;
407 }
408 acpi_os_drop_map_ref(map);
409 mutex_unlock(&acpi_ioremap_lock);
410
411 acpi_os_map_cleanup(map);
412 }
413 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
414
415 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
416 {
417 if (!acpi_gbl_permanent_mmap)
418 __acpi_unmap_table(virt, size);
419 }
420
421 int acpi_os_map_generic_address(struct acpi_generic_address *gas)
422 {
423 u64 addr;
424 void __iomem *virt;
425
426 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
427 return 0;
428
429 /* Handle possible alignment issues */
430 memcpy(&addr, &gas->address, sizeof(addr));
431 if (!addr || !gas->bit_width)
432 return -EINVAL;
433
434 virt = acpi_os_map_memory(addr, gas->bit_width / 8);
435 if (!virt)
436 return -EIO;
437
438 return 0;
439 }
440 EXPORT_SYMBOL(acpi_os_map_generic_address);
441
442 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
443 {
444 u64 addr;
445 struct acpi_ioremap *map;
446
447 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
448 return;
449
450 /* Handle possible alignment issues */
451 memcpy(&addr, &gas->address, sizeof(addr));
452 if (!addr || !gas->bit_width)
453 return;
454
455 mutex_lock(&acpi_ioremap_lock);
456 map = acpi_map_lookup(addr, gas->bit_width / 8);
457 if (!map) {
458 mutex_unlock(&acpi_ioremap_lock);
459 return;
460 }
461 acpi_os_drop_map_ref(map);
462 mutex_unlock(&acpi_ioremap_lock);
463
464 acpi_os_map_cleanup(map);
465 }
466 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
467
468 #ifdef ACPI_FUTURE_USAGE
469 acpi_status
470 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
471 {
472 if (!phys || !virt)
473 return AE_BAD_PARAMETER;
474
475 *phys = virt_to_phys(virt);
476
477 return AE_OK;
478 }
479 #endif
480
481 #define ACPI_MAX_OVERRIDE_LEN 100
482
483 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
484
485 acpi_status
486 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
487 acpi_string * new_val)
488 {
489 if (!init_val || !new_val)
490 return AE_BAD_PARAMETER;
491
492 *new_val = NULL;
493 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
494 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
495 acpi_os_name);
496 *new_val = acpi_os_name;
497 }
498
499 return AE_OK;
500 }
501
502 acpi_status
503 acpi_os_table_override(struct acpi_table_header * existing_table,
504 struct acpi_table_header ** new_table)
505 {
506 if (!existing_table || !new_table)
507 return AE_BAD_PARAMETER;
508
509 *new_table = NULL;
510
511 #ifdef CONFIG_ACPI_CUSTOM_DSDT
512 if (strncmp(existing_table->signature, "DSDT", 4) == 0)
513 *new_table = (struct acpi_table_header *)AmlCode;
514 #endif
515 if (*new_table != NULL) {
516 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
517 "this is unsafe: tainting kernel\n",
518 existing_table->signature,
519 existing_table->oem_table_id);
520 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
521 }
522 return AE_OK;
523 }
524
525 static irqreturn_t acpi_irq(int irq, void *dev_id)
526 {
527 u32 handled;
528
529 handled = (*acpi_irq_handler) (acpi_irq_context);
530
531 if (handled) {
532 acpi_irq_handled++;
533 return IRQ_HANDLED;
534 } else {
535 acpi_irq_not_handled++;
536 return IRQ_NONE;
537 }
538 }
539
540 acpi_status
541 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
542 void *context)
543 {
544 unsigned int irq;
545
546 acpi_irq_stats_init();
547
548 /*
549 * ACPI interrupts different from the SCI in our copy of the FADT are
550 * not supported.
551 */
552 if (gsi != acpi_gbl_FADT.sci_interrupt)
553 return AE_BAD_PARAMETER;
554
555 if (acpi_irq_handler)
556 return AE_ALREADY_ACQUIRED;
557
558 if (acpi_gsi_to_irq(gsi, &irq) < 0) {
559 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
560 gsi);
561 return AE_OK;
562 }
563
564 acpi_irq_handler = handler;
565 acpi_irq_context = context;
566 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
567 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
568 acpi_irq_handler = NULL;
569 return AE_NOT_ACQUIRED;
570 }
571
572 return AE_OK;
573 }
574
575 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
576 {
577 if (irq != acpi_gbl_FADT.sci_interrupt)
578 return AE_BAD_PARAMETER;
579
580 free_irq(irq, acpi_irq);
581 acpi_irq_handler = NULL;
582
583 return AE_OK;
584 }
585
586 /*
587 * Running in interpreter thread context, safe to sleep
588 */
589
590 void acpi_os_sleep(u64 ms)
591 {
592 schedule_timeout_interruptible(msecs_to_jiffies(ms));
593 }
594
595 void acpi_os_stall(u32 us)
596 {
597 while (us) {
598 u32 delay = 1000;
599
600 if (delay > us)
601 delay = us;
602 udelay(delay);
603 touch_nmi_watchdog();
604 us -= delay;
605 }
606 }
607
608 /*
609 * Support ACPI 3.0 AML Timer operand
610 * Returns 64-bit free-running, monotonically increasing timer
611 * with 100ns granularity
612 */
613 u64 acpi_os_get_timer(void)
614 {
615 static u64 t;
616
617 #ifdef CONFIG_HPET
618 /* TBD: use HPET if available */
619 #endif
620
621 #ifdef CONFIG_X86_PM_TIMER
622 /* TBD: default to PM timer if HPET was not available */
623 #endif
624 if (!t)
625 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
626
627 return ++t;
628 }
629
630 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
631 {
632 u32 dummy;
633
634 if (!value)
635 value = &dummy;
636
637 *value = 0;
638 if (width <= 8) {
639 *(u8 *) value = inb(port);
640 } else if (width <= 16) {
641 *(u16 *) value = inw(port);
642 } else if (width <= 32) {
643 *(u32 *) value = inl(port);
644 } else {
645 BUG();
646 }
647
648 return AE_OK;
649 }
650
651 EXPORT_SYMBOL(acpi_os_read_port);
652
653 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
654 {
655 if (width <= 8) {
656 outb(value, port);
657 } else if (width <= 16) {
658 outw(value, port);
659 } else if (width <= 32) {
660 outl(value, port);
661 } else {
662 BUG();
663 }
664
665 return AE_OK;
666 }
667
668 EXPORT_SYMBOL(acpi_os_write_port);
669
670 acpi_status
671 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
672 {
673 void __iomem *virt_addr;
674 unsigned int size = width / 8;
675 bool unmap = false;
676 u32 dummy;
677
678 rcu_read_lock();
679 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
680 if (!virt_addr) {
681 rcu_read_unlock();
682 virt_addr = acpi_os_ioremap(phys_addr, size);
683 if (!virt_addr)
684 return AE_BAD_ADDRESS;
685 unmap = true;
686 }
687
688 if (!value)
689 value = &dummy;
690
691 switch (width) {
692 case 8:
693 *(u8 *) value = readb(virt_addr);
694 break;
695 case 16:
696 *(u16 *) value = readw(virt_addr);
697 break;
698 case 32:
699 *(u32 *) value = readl(virt_addr);
700 break;
701 default:
702 BUG();
703 }
704
705 if (unmap)
706 iounmap(virt_addr);
707 else
708 rcu_read_unlock();
709
710 return AE_OK;
711 }
712
713 acpi_status
714 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
715 {
716 void __iomem *virt_addr;
717 unsigned int size = width / 8;
718 bool unmap = false;
719
720 rcu_read_lock();
721 virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
722 if (!virt_addr) {
723 rcu_read_unlock();
724 virt_addr = acpi_os_ioremap(phys_addr, size);
725 if (!virt_addr)
726 return AE_BAD_ADDRESS;
727 unmap = true;
728 }
729
730 switch (width) {
731 case 8:
732 writeb(value, virt_addr);
733 break;
734 case 16:
735 writew(value, virt_addr);
736 break;
737 case 32:
738 writel(value, virt_addr);
739 break;
740 default:
741 BUG();
742 }
743
744 if (unmap)
745 iounmap(virt_addr);
746 else
747 rcu_read_unlock();
748
749 return AE_OK;
750 }
751
752 acpi_status
753 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
754 u64 *value, u32 width)
755 {
756 int result, size;
757 u32 value32;
758
759 if (!value)
760 return AE_BAD_PARAMETER;
761
762 switch (width) {
763 case 8:
764 size = 1;
765 break;
766 case 16:
767 size = 2;
768 break;
769 case 32:
770 size = 4;
771 break;
772 default:
773 return AE_ERROR;
774 }
775
776 result = raw_pci_read(pci_id->segment, pci_id->bus,
777 PCI_DEVFN(pci_id->device, pci_id->function),
778 reg, size, &value32);
779 *value = value32;
780
781 return (result ? AE_ERROR : AE_OK);
782 }
783
784 acpi_status
785 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
786 u64 value, u32 width)
787 {
788 int result, size;
789
790 switch (width) {
791 case 8:
792 size = 1;
793 break;
794 case 16:
795 size = 2;
796 break;
797 case 32:
798 size = 4;
799 break;
800 default:
801 return AE_ERROR;
802 }
803
804 result = raw_pci_write(pci_id->segment, pci_id->bus,
805 PCI_DEVFN(pci_id->device, pci_id->function),
806 reg, size, value);
807
808 return (result ? AE_ERROR : AE_OK);
809 }
810
811 static void acpi_os_execute_deferred(struct work_struct *work)
812 {
813 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
814
815 if (dpc->wait)
816 acpi_os_wait_events_complete(NULL);
817
818 dpc->function(dpc->context);
819 kfree(dpc);
820 }
821
822 /*******************************************************************************
823 *
824 * FUNCTION: acpi_os_execute
825 *
826 * PARAMETERS: Type - Type of the callback
827 * Function - Function to be executed
828 * Context - Function parameters
829 *
830 * RETURN: Status
831 *
832 * DESCRIPTION: Depending on type, either queues function for deferred execution or
833 * immediately executes function on a separate thread.
834 *
835 ******************************************************************************/
836
837 static acpi_status __acpi_os_execute(acpi_execute_type type,
838 acpi_osd_exec_callback function, void *context, int hp)
839 {
840 acpi_status status = AE_OK;
841 struct acpi_os_dpc *dpc;
842 struct workqueue_struct *queue;
843 int ret;
844 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
845 "Scheduling function [%p(%p)] for deferred execution.\n",
846 function, context));
847
848 /*
849 * Allocate/initialize DPC structure. Note that this memory will be
850 * freed by the callee. The kernel handles the work_struct list in a
851 * way that allows us to also free its memory inside the callee.
852 * Because we may want to schedule several tasks with different
853 * parameters we can't use the approach some kernel code uses of
854 * having a static work_struct.
855 */
856
857 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
858 if (!dpc)
859 return AE_NO_MEMORY;
860
861 dpc->function = function;
862 dpc->context = context;
863
864 /*
865 * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
866 * because the hotplug code may call driver .remove() functions,
867 * which invoke flush_scheduled_work/acpi_os_wait_events_complete
868 * to flush these workqueues.
869 */
870 queue = hp ? kacpi_hotplug_wq :
871 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
872 dpc->wait = hp ? 1 : 0;
873
874 if (queue == kacpi_hotplug_wq)
875 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
876 else if (queue == kacpi_notify_wq)
877 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
878 else
879 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
880
881 /*
882 * On some machines, a software-initiated SMI causes corruption unless
883 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
884 * typically it's done in GPE-related methods that are run via
885 * workqueues, so we can avoid the known corruption cases by always
886 * queueing on CPU 0.
887 */
888 ret = queue_work_on(0, queue, &dpc->work);
889
890 if (!ret) {
891 printk(KERN_ERR PREFIX
892 "Call to queue_work() failed.\n");
893 status = AE_ERROR;
894 kfree(dpc);
895 }
896 return status;
897 }
898
899 acpi_status acpi_os_execute(acpi_execute_type type,
900 acpi_osd_exec_callback function, void *context)
901 {
902 return __acpi_os_execute(type, function, context, 0);
903 }
904 EXPORT_SYMBOL(acpi_os_execute);
905
906 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
907 void *context)
908 {
909 return __acpi_os_execute(0, function, context, 1);
910 }
911
912 void acpi_os_wait_events_complete(void *context)
913 {
914 flush_workqueue(kacpid_wq);
915 flush_workqueue(kacpi_notify_wq);
916 }
917
918 EXPORT_SYMBOL(acpi_os_wait_events_complete);
919
920 acpi_status
921 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
922 {
923 struct semaphore *sem = NULL;
924
925 sem = acpi_os_allocate(sizeof(struct semaphore));
926 if (!sem)
927 return AE_NO_MEMORY;
928 memset(sem, 0, sizeof(struct semaphore));
929
930 sema_init(sem, initial_units);
931
932 *handle = (acpi_handle *) sem;
933
934 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
935 *handle, initial_units));
936
937 return AE_OK;
938 }
939
940 /*
941 * TODO: A better way to delete semaphores? Linux doesn't have a
942 * 'delete_semaphore()' function -- may result in an invalid
943 * pointer dereference for non-synchronized consumers. Should
944 * we at least check for blocked threads and signal/cancel them?
945 */
946
947 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
948 {
949 struct semaphore *sem = (struct semaphore *)handle;
950
951 if (!sem)
952 return AE_BAD_PARAMETER;
953
954 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
955
956 BUG_ON(!list_empty(&sem->wait_list));
957 kfree(sem);
958 sem = NULL;
959
960 return AE_OK;
961 }
962
963 /*
964 * TODO: Support for units > 1?
965 */
966 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
967 {
968 acpi_status status = AE_OK;
969 struct semaphore *sem = (struct semaphore *)handle;
970 long jiffies;
971 int ret = 0;
972
973 if (!sem || (units < 1))
974 return AE_BAD_PARAMETER;
975
976 if (units > 1)
977 return AE_SUPPORT;
978
979 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
980 handle, units, timeout));
981
982 if (timeout == ACPI_WAIT_FOREVER)
983 jiffies = MAX_SCHEDULE_TIMEOUT;
984 else
985 jiffies = msecs_to_jiffies(timeout);
986
987 ret = down_timeout(sem, jiffies);
988 if (ret)
989 status = AE_TIME;
990
991 if (ACPI_FAILURE(status)) {
992 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
993 "Failed to acquire semaphore[%p|%d|%d], %s",
994 handle, units, timeout,
995 acpi_format_exception(status)));
996 } else {
997 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
998 "Acquired semaphore[%p|%d|%d]", handle,
999 units, timeout));
1000 }
1001
1002 return status;
1003 }
1004
1005 /*
1006 * TODO: Support for units > 1?
1007 */
1008 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
1009 {
1010 struct semaphore *sem = (struct semaphore *)handle;
1011
1012 if (!sem || (units < 1))
1013 return AE_BAD_PARAMETER;
1014
1015 if (units > 1)
1016 return AE_SUPPORT;
1017
1018 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1019 units));
1020
1021 up(sem);
1022
1023 return AE_OK;
1024 }
1025
1026 #ifdef ACPI_FUTURE_USAGE
1027 u32 acpi_os_get_line(char *buffer)
1028 {
1029
1030 #ifdef ENABLE_DEBUGGER
1031 if (acpi_in_debugger) {
1032 u32 chars;
1033
1034 kdb_read(buffer, sizeof(line_buf));
1035
1036 /* remove the CR kdb includes */
1037 chars = strlen(buffer) - 1;
1038 buffer[chars] = '\0';
1039 }
1040 #endif
1041
1042 return 0;
1043 }
1044 #endif /* ACPI_FUTURE_USAGE */
1045
1046 acpi_status acpi_os_signal(u32 function, void *info)
1047 {
1048 switch (function) {
1049 case ACPI_SIGNAL_FATAL:
1050 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1051 break;
1052 case ACPI_SIGNAL_BREAKPOINT:
1053 /*
1054 * AML Breakpoint
1055 * ACPI spec. says to treat it as a NOP unless
1056 * you are debugging. So if/when we integrate
1057 * AML debugger into the kernel debugger its
1058 * hook will go here. But until then it is
1059 * not useful to print anything on breakpoints.
1060 */
1061 break;
1062 default:
1063 break;
1064 }
1065
1066 return AE_OK;
1067 }
1068
1069 static int __init acpi_os_name_setup(char *str)
1070 {
1071 char *p = acpi_os_name;
1072 int count = ACPI_MAX_OVERRIDE_LEN - 1;
1073
1074 if (!str || !*str)
1075 return 0;
1076
1077 for (; count-- && str && *str; str++) {
1078 if (isalnum(*str) || *str == ' ' || *str == ':')
1079 *p++ = *str;
1080 else if (*str == '\'' || *str == '"')
1081 continue;
1082 else
1083 break;
1084 }
1085 *p = 0;
1086
1087 return 1;
1088
1089 }
1090
1091 __setup("acpi_os_name=", acpi_os_name_setup);
1092
1093 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
1094 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */
1095
1096 struct osi_setup_entry {
1097 char string[OSI_STRING_LENGTH_MAX];
1098 bool enable;
1099 };
1100
1101 static struct osi_setup_entry __initdata
1102 osi_setup_entries[OSI_STRING_ENTRIES_MAX] = {
1103 {"Module Device", true},
1104 {"Processor Device", true},
1105 {"3.0 _SCP Extensions", true},
1106 {"Processor Aggregator Device", true},
1107 };
1108
1109 void __init acpi_osi_setup(char *str)
1110 {
1111 struct osi_setup_entry *osi;
1112 bool enable = true;
1113 int i;
1114
1115 if (!acpi_gbl_create_osi_method)
1116 return;
1117
1118 if (str == NULL || *str == '\0') {
1119 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1120 acpi_gbl_create_osi_method = FALSE;
1121 return;
1122 }
1123
1124 if (*str == '!') {
1125 str++;
1126 enable = false;
1127 }
1128
1129 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1130 osi = &osi_setup_entries[i];
1131 if (!strcmp(osi->string, str)) {
1132 osi->enable = enable;
1133 break;
1134 } else if (osi->string[0] == '\0') {
1135 osi->enable = enable;
1136 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
1137 break;
1138 }
1139 }
1140 }
1141
1142 static void __init set_osi_linux(unsigned int enable)
1143 {
1144 if (osi_linux.enable != enable)
1145 osi_linux.enable = enable;
1146
1147 if (osi_linux.enable)
1148 acpi_osi_setup("Linux");
1149 else
1150 acpi_osi_setup("!Linux");
1151
1152 return;
1153 }
1154
1155 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1156 {
1157 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */
1158 osi_linux.dmi = 0;
1159 set_osi_linux(enable);
1160
1161 return;
1162 }
1163
1164 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1165 {
1166 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1167
1168 if (enable == -1)
1169 return;
1170
1171 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
1172 set_osi_linux(enable);
1173
1174 return;
1175 }
1176
1177 /*
1178 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1179 *
1180 * empty string disables _OSI
1181 * string starting with '!' disables that string
1182 * otherwise string is added to list, augmenting built-in strings
1183 */
1184 static void __init acpi_osi_setup_late(void)
1185 {
1186 struct osi_setup_entry *osi;
1187 char *str;
1188 int i;
1189 acpi_status status;
1190
1191 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
1192 osi = &osi_setup_entries[i];
1193 str = osi->string;
1194
1195 if (*str == '\0')
1196 break;
1197 if (osi->enable) {
1198 status = acpi_install_interface(str);
1199
1200 if (ACPI_SUCCESS(status))
1201 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1202 } else {
1203 status = acpi_remove_interface(str);
1204
1205 if (ACPI_SUCCESS(status))
1206 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1207 }
1208 }
1209 }
1210
1211 static int __init osi_setup(char *str)
1212 {
1213 if (str && !strcmp("Linux", str))
1214 acpi_cmdline_osi_linux(1);
1215 else if (str && !strcmp("!Linux", str))
1216 acpi_cmdline_osi_linux(0);
1217 else
1218 acpi_osi_setup(str);
1219
1220 return 1;
1221 }
1222
1223 __setup("acpi_osi=", osi_setup);
1224
1225 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1226 static int __init acpi_serialize_setup(char *str)
1227 {
1228 printk(KERN_INFO PREFIX "serialize enabled\n");
1229
1230 acpi_gbl_all_methods_serialized = TRUE;
1231
1232 return 1;
1233 }
1234
1235 __setup("acpi_serialize", acpi_serialize_setup);
1236
1237 /* Check of resource interference between native drivers and ACPI
1238 * OperationRegions (SystemIO and System Memory only).
1239 * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1240 * in arbitrary AML code and can interfere with legacy drivers.
1241 * acpi_enforce_resources= can be set to:
1242 *
1243 * - strict (default) (2)
1244 * -> further driver trying to access the resources will not load
1245 * - lax (1)
1246 * -> further driver trying to access the resources will load, but you
1247 * get a system message that something might go wrong...
1248 *
1249 * - no (0)
1250 * -> ACPI Operation Region resources will not be registered
1251 *
1252 */
1253 #define ENFORCE_RESOURCES_STRICT 2
1254 #define ENFORCE_RESOURCES_LAX 1
1255 #define ENFORCE_RESOURCES_NO 0
1256
1257 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1258
1259 static int __init acpi_enforce_resources_setup(char *str)
1260 {
1261 if (str == NULL || *str == '\0')
1262 return 0;
1263
1264 if (!strcmp("strict", str))
1265 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1266 else if (!strcmp("lax", str))
1267 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1268 else if (!strcmp("no", str))
1269 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1270
1271 return 1;
1272 }
1273
1274 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1275
1276 /* Check for resource conflicts between ACPI OperationRegions and native
1277 * drivers */
1278 int acpi_check_resource_conflict(const struct resource *res)
1279 {
1280 acpi_adr_space_type space_id;
1281 acpi_size length;
1282 u8 warn = 0;
1283 int clash = 0;
1284
1285 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1286 return 0;
1287 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1288 return 0;
1289
1290 if (res->flags & IORESOURCE_IO)
1291 space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1292 else
1293 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
1294
1295 length = res->end - res->start + 1;
1296 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
1297 warn = 1;
1298 clash = acpi_check_address_range(space_id, res->start, length, warn);
1299
1300 if (clash) {
1301 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1302 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1303 printk(KERN_NOTICE "ACPI: This conflict may"
1304 " cause random problems and system"
1305 " instability\n");
1306 printk(KERN_INFO "ACPI: If an ACPI driver is available"
1307 " for this device, you should use it instead of"
1308 " the native driver\n");
1309 }
1310 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1311 return -EBUSY;
1312 }
1313 return 0;
1314 }
1315 EXPORT_SYMBOL(acpi_check_resource_conflict);
1316
1317 int acpi_check_region(resource_size_t start, resource_size_t n,
1318 const char *name)
1319 {
1320 struct resource res = {
1321 .start = start,
1322 .end = start + n - 1,
1323 .name = name,
1324 .flags = IORESOURCE_IO,
1325 };
1326
1327 return acpi_check_resource_conflict(&res);
1328 }
1329 EXPORT_SYMBOL(acpi_check_region);
1330
1331 /*
1332 * Let drivers know whether the resource checks are effective
1333 */
1334 int acpi_resources_are_enforced(void)
1335 {
1336 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1337 }
1338 EXPORT_SYMBOL(acpi_resources_are_enforced);
1339
1340 /*
1341 * Deallocate the memory for a spinlock.
1342 */
1343 void acpi_os_delete_lock(acpi_spinlock handle)
1344 {
1345 ACPI_FREE(handle);
1346 }
1347
1348 /*
1349 * Acquire a spinlock.
1350 *
1351 * handle is a pointer to the spinlock_t.
1352 */
1353
1354 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1355 {
1356 acpi_cpu_flags flags;
1357 spin_lock_irqsave(lockp, flags);
1358 return flags;
1359 }
1360
1361 /*
1362 * Release a spinlock. See above.
1363 */
1364
1365 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1366 {
1367 spin_unlock_irqrestore(lockp, flags);
1368 }
1369
1370 #ifndef ACPI_USE_LOCAL_CACHE
1371
1372 /*******************************************************************************
1373 *
1374 * FUNCTION: acpi_os_create_cache
1375 *
1376 * PARAMETERS: name - Ascii name for the cache
1377 * size - Size of each cached object
1378 * depth - Maximum depth of the cache (in objects) <ignored>
1379 * cache - Where the new cache object is returned
1380 *
1381 * RETURN: status
1382 *
1383 * DESCRIPTION: Create a cache object
1384 *
1385 ******************************************************************************/
1386
1387 acpi_status
1388 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1389 {
1390 *cache = kmem_cache_create(name, size, 0, 0, NULL);
1391 if (*cache == NULL)
1392 return AE_ERROR;
1393 else
1394 return AE_OK;
1395 }
1396
1397 /*******************************************************************************
1398 *
1399 * FUNCTION: acpi_os_purge_cache
1400 *
1401 * PARAMETERS: Cache - Handle to cache object
1402 *
1403 * RETURN: Status
1404 *
1405 * DESCRIPTION: Free all objects within the requested cache.
1406 *
1407 ******************************************************************************/
1408
1409 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1410 {
1411 kmem_cache_shrink(cache);
1412 return (AE_OK);
1413 }
1414
1415 /*******************************************************************************
1416 *
1417 * FUNCTION: acpi_os_delete_cache
1418 *
1419 * PARAMETERS: Cache - Handle to cache object
1420 *
1421 * RETURN: Status
1422 *
1423 * DESCRIPTION: Free all objects within the requested cache and delete the
1424 * cache object.
1425 *
1426 ******************************************************************************/
1427
1428 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1429 {
1430 kmem_cache_destroy(cache);
1431 return (AE_OK);
1432 }
1433
1434 /*******************************************************************************
1435 *
1436 * FUNCTION: acpi_os_release_object
1437 *
1438 * PARAMETERS: Cache - Handle to cache object
1439 * Object - The object to be released
1440 *
1441 * RETURN: None
1442 *
1443 * DESCRIPTION: Release an object to the specified cache. If cache is full,
1444 * the object is deleted.
1445 *
1446 ******************************************************************************/
1447
1448 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1449 {
1450 kmem_cache_free(cache, object);
1451 return (AE_OK);
1452 }
1453 #endif
1454
1455 acpi_status __init acpi_os_initialize(void)
1456 {
1457 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1458 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1459 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
1460 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
1461
1462 return AE_OK;
1463 }
1464
1465 acpi_status __init acpi_os_initialize1(void)
1466 {
1467 kacpid_wq = alloc_workqueue("kacpid", 0, 1);
1468 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
1469 kacpi_hotplug_wq = alloc_workqueue("kacpi_hotplug", 0, 1);
1470 BUG_ON(!kacpid_wq);
1471 BUG_ON(!kacpi_notify_wq);
1472 BUG_ON(!kacpi_hotplug_wq);
1473 acpi_install_interface_handler(acpi_osi_handler);
1474 acpi_osi_setup_late();
1475 return AE_OK;
1476 }
1477
1478 acpi_status acpi_os_terminate(void)
1479 {
1480 if (acpi_irq_handler) {
1481 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
1482 acpi_irq_handler);
1483 }
1484
1485 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
1486 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
1487 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
1488 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
1489
1490 destroy_workqueue(kacpid_wq);
1491 destroy_workqueue(kacpi_notify_wq);
1492 destroy_workqueue(kacpi_hotplug_wq);
1493
1494 return AE_OK;
1495 }
kernel source for telekom puls (alcatel/mediatek)