ACPICA: Update all ACPICA copyrights and signons to 2011
[linux-2.6.git] / drivers / acpi / sysfs.c
1 /*
2  * sysfs.c - ACPI sysfs interface to userspace.
3  */
4
5 #include <linux/init.h>
6 #include <linux/kernel.h>
7 #include <linux/moduleparam.h>
8 #include <acpi/acpi_drivers.h>
9
10 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
11 ACPI_MODULE_NAME("sysfs");
12
13 #define PREFIX "ACPI: "
14
15 #ifdef CONFIG_ACPI_DEBUG
16 /*
17  * ACPI debug sysfs I/F, including:
18  * /sys/modules/acpi/parameters/debug_layer
19  * /sys/modules/acpi/parameters/debug_level
20  * /sys/modules/acpi/parameters/trace_method_name
21  * /sys/modules/acpi/parameters/trace_state
22  * /sys/modules/acpi/parameters/trace_debug_layer
23  * /sys/modules/acpi/parameters/trace_debug_level
24  */
25
26 struct acpi_dlayer {
27         const char *name;
28         unsigned long value;
29 };
30 struct acpi_dlevel {
31         const char *name;
32         unsigned long value;
33 };
34 #define ACPI_DEBUG_INIT(v)      { .name = #v, .value = v }
35
36 static const struct acpi_dlayer acpi_debug_layers[] = {
37         ACPI_DEBUG_INIT(ACPI_UTILITIES),
38         ACPI_DEBUG_INIT(ACPI_HARDWARE),
39         ACPI_DEBUG_INIT(ACPI_EVENTS),
40         ACPI_DEBUG_INIT(ACPI_TABLES),
41         ACPI_DEBUG_INIT(ACPI_NAMESPACE),
42         ACPI_DEBUG_INIT(ACPI_PARSER),
43         ACPI_DEBUG_INIT(ACPI_DISPATCHER),
44         ACPI_DEBUG_INIT(ACPI_EXECUTER),
45         ACPI_DEBUG_INIT(ACPI_RESOURCES),
46         ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
47         ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
48         ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
49         ACPI_DEBUG_INIT(ACPI_COMPILER),
50         ACPI_DEBUG_INIT(ACPI_TOOLS),
51
52         ACPI_DEBUG_INIT(ACPI_BUS_COMPONENT),
53         ACPI_DEBUG_INIT(ACPI_AC_COMPONENT),
54         ACPI_DEBUG_INIT(ACPI_BATTERY_COMPONENT),
55         ACPI_DEBUG_INIT(ACPI_BUTTON_COMPONENT),
56         ACPI_DEBUG_INIT(ACPI_SBS_COMPONENT),
57         ACPI_DEBUG_INIT(ACPI_FAN_COMPONENT),
58         ACPI_DEBUG_INIT(ACPI_PCI_COMPONENT),
59         ACPI_DEBUG_INIT(ACPI_POWER_COMPONENT),
60         ACPI_DEBUG_INIT(ACPI_CONTAINER_COMPONENT),
61         ACPI_DEBUG_INIT(ACPI_SYSTEM_COMPONENT),
62         ACPI_DEBUG_INIT(ACPI_THERMAL_COMPONENT),
63         ACPI_DEBUG_INIT(ACPI_MEMORY_DEVICE_COMPONENT),
64         ACPI_DEBUG_INIT(ACPI_VIDEO_COMPONENT),
65         ACPI_DEBUG_INIT(ACPI_PROCESSOR_COMPONENT),
66 };
67
68 static const struct acpi_dlevel acpi_debug_levels[] = {
69         ACPI_DEBUG_INIT(ACPI_LV_INIT),
70         ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
71         ACPI_DEBUG_INIT(ACPI_LV_INFO),
72
73         ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
74         ACPI_DEBUG_INIT(ACPI_LV_PARSE),
75         ACPI_DEBUG_INIT(ACPI_LV_LOAD),
76         ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
77         ACPI_DEBUG_INIT(ACPI_LV_EXEC),
78         ACPI_DEBUG_INIT(ACPI_LV_NAMES),
79         ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
80         ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
81         ACPI_DEBUG_INIT(ACPI_LV_TABLES),
82         ACPI_DEBUG_INIT(ACPI_LV_VALUES),
83         ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
84         ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
85         ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
86         ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
87
88         ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
89         ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
90         ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
91
92         ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
93         ACPI_DEBUG_INIT(ACPI_LV_THREADS),
94         ACPI_DEBUG_INIT(ACPI_LV_IO),
95         ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
96
97         ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
98         ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
99         ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
100         ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
101 };
102
103 static int param_get_debug_layer(char *buffer, const struct kernel_param *kp)
104 {
105         int result = 0;
106         int i;
107
108         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
109
110         for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
111                 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
112                                   acpi_debug_layers[i].name,
113                                   acpi_debug_layers[i].value,
114                                   (acpi_dbg_layer & acpi_debug_layers[i].value)
115                                   ? '*' : ' ');
116         }
117         result +=
118             sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
119                     ACPI_ALL_DRIVERS,
120                     (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
121                     ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS)
122                     == 0 ? ' ' : '-');
123         result +=
124             sprintf(buffer + result,
125                     "--\ndebug_layer = 0x%08X ( * = enabled)\n",
126                     acpi_dbg_layer);
127
128         return result;
129 }
130
131 static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
132 {
133         int result = 0;
134         int i;
135
136         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
137
138         for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
139                 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
140                                   acpi_debug_levels[i].name,
141                                   acpi_debug_levels[i].value,
142                                   (acpi_dbg_level & acpi_debug_levels[i].value)
143                                   ? '*' : ' ');
144         }
145         result +=
146             sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n",
147                     acpi_dbg_level);
148
149         return result;
150 }
151
152 static struct kernel_param_ops param_ops_debug_layer = {
153         .set = param_set_uint,
154         .get = param_get_debug_layer,
155 };
156
157 static struct kernel_param_ops param_ops_debug_level = {
158         .set = param_set_uint,
159         .get = param_get_debug_level,
160 };
161
162 module_param_cb(debug_layer, &param_ops_debug_layer, &acpi_dbg_layer, 0644);
163 module_param_cb(debug_level, &param_ops_debug_level, &acpi_dbg_level, 0644);
164
165 static char trace_method_name[6];
166 module_param_string(trace_method_name, trace_method_name, 6, 0644);
167 static unsigned int trace_debug_layer;
168 module_param(trace_debug_layer, uint, 0644);
169 static unsigned int trace_debug_level;
170 module_param(trace_debug_level, uint, 0644);
171
172 static int param_set_trace_state(const char *val, struct kernel_param *kp)
173 {
174         int result = 0;
175
176         if (!strncmp(val, "enable", strlen("enable") - 1)) {
177                 result = acpi_debug_trace(trace_method_name, trace_debug_level,
178                                           trace_debug_layer, 0);
179                 if (result)
180                         result = -EBUSY;
181                 goto exit;
182         }
183
184         if (!strncmp(val, "disable", strlen("disable") - 1)) {
185                 int name = 0;
186                 result = acpi_debug_trace((char *)&name, trace_debug_level,
187                                           trace_debug_layer, 0);
188                 if (result)
189                         result = -EBUSY;
190                 goto exit;
191         }
192
193         if (!strncmp(val, "1", 1)) {
194                 result = acpi_debug_trace(trace_method_name, trace_debug_level,
195                                           trace_debug_layer, 1);
196                 if (result)
197                         result = -EBUSY;
198                 goto exit;
199         }
200
201         result = -EINVAL;
202 exit:
203         return result;
204 }
205
206 static int param_get_trace_state(char *buffer, struct kernel_param *kp)
207 {
208         if (!acpi_gbl_trace_method_name)
209                 return sprintf(buffer, "disable");
210         else {
211                 if (acpi_gbl_trace_flags & 1)
212                         return sprintf(buffer, "1");
213                 else
214                         return sprintf(buffer, "enable");
215         }
216         return 0;
217 }
218
219 module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
220                   NULL, 0644);
221 #endif /* CONFIG_ACPI_DEBUG */
222
223 /* /sys/module/acpi/parameters/acpica_version */
224 static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
225 {
226         int result;
227
228         result = sprintf(buffer, "%x", ACPI_CA_VERSION);
229
230         return result;
231 }
232
233 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
234
235 /*
236  * ACPI table sysfs I/F:
237  * /sys/firmware/acpi/tables/
238  * /sys/firmware/acpi/tables/dynamic/
239  */
240
241 static LIST_HEAD(acpi_table_attr_list);
242 static struct kobject *tables_kobj;
243 static struct kobject *dynamic_tables_kobj;
244
245 struct acpi_table_attr {
246         struct bin_attribute attr;
247         char name[8];
248         int instance;
249         struct list_head node;
250 };
251
252 static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
253                                struct bin_attribute *bin_attr, char *buf,
254                                loff_t offset, size_t count)
255 {
256         struct acpi_table_attr *table_attr =
257             container_of(bin_attr, struct acpi_table_attr, attr);
258         struct acpi_table_header *table_header = NULL;
259         acpi_status status;
260         char name[ACPI_NAME_SIZE];
261
262         if (strncmp(table_attr->name, "NULL", 4))
263                 memcpy(name, table_attr->name, ACPI_NAME_SIZE);
264         else
265                 memcpy(name, "\0\0\0\0", 4);
266
267         status = acpi_get_table(name, table_attr->instance, &table_header);
268         if (ACPI_FAILURE(status))
269                 return -ENODEV;
270
271         return memory_read_from_buffer(buf, count, &offset,
272                                        table_header, table_header->length);
273 }
274
275 static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
276                                  struct acpi_table_header *table_header)
277 {
278         struct acpi_table_header *header = NULL;
279         struct acpi_table_attr *attr = NULL;
280
281         sysfs_attr_init(&table_attr->attr.attr);
282         if (table_header->signature[0] != '\0')
283                 memcpy(table_attr->name, table_header->signature,
284                        ACPI_NAME_SIZE);
285         else
286                 memcpy(table_attr->name, "NULL", 4);
287
288         list_for_each_entry(attr, &acpi_table_attr_list, node) {
289                 if (!memcmp(table_attr->name, attr->name, ACPI_NAME_SIZE))
290                         if (table_attr->instance < attr->instance)
291                                 table_attr->instance = attr->instance;
292         }
293         table_attr->instance++;
294
295         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
296                                          !acpi_get_table
297                                          (table_header->signature, 2, &header)))
298                 sprintf(table_attr->name + ACPI_NAME_SIZE, "%d",
299                         table_attr->instance);
300
301         table_attr->attr.size = 0;
302         table_attr->attr.read = acpi_table_show;
303         table_attr->attr.attr.name = table_attr->name;
304         table_attr->attr.attr.mode = 0400;
305
306         return;
307 }
308
309 static acpi_status
310 acpi_sysfs_table_handler(u32 event, void *table, void *context)
311 {
312         struct acpi_table_attr *table_attr;
313
314         switch (event) {
315         case ACPI_TABLE_EVENT_LOAD:
316                 table_attr =
317                     kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
318                 if (!table_attr)
319                         return AE_NO_MEMORY;
320
321                 acpi_table_attr_init(table_attr, table);
322                 if (sysfs_create_bin_file(dynamic_tables_kobj,
323                                           &table_attr->attr)) {
324                         kfree(table_attr);
325                         return AE_ERROR;
326                 } else
327                         list_add_tail(&table_attr->node, &acpi_table_attr_list);
328                 break;
329         case ACPI_TABLE_EVENT_UNLOAD:
330                 /*
331                  * we do not need to do anything right now
332                  * because the table is not deleted from the
333                  * global table list when unloading it.
334                  */
335                 break;
336         default:
337                 return AE_BAD_PARAMETER;
338         }
339         return AE_OK;
340 }
341
342 static int acpi_tables_sysfs_init(void)
343 {
344         struct acpi_table_attr *table_attr;
345         struct acpi_table_header *table_header = NULL;
346         int table_index = 0;
347         int result;
348
349         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
350         if (!tables_kobj)
351                 goto err;
352
353         dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
354         if (!dynamic_tables_kobj)
355                 goto err_dynamic_tables;
356
357         do {
358                 result = acpi_get_table_by_index(table_index, &table_header);
359                 if (!result) {
360                         table_index++;
361                         table_attr = NULL;
362                         table_attr =
363                             kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
364                         if (!table_attr)
365                                 return -ENOMEM;
366
367                         acpi_table_attr_init(table_attr, table_header);
368                         result =
369                             sysfs_create_bin_file(tables_kobj,
370                                                   &table_attr->attr);
371                         if (result) {
372                                 kfree(table_attr);
373                                 return result;
374                         } else
375                                 list_add_tail(&table_attr->node,
376                                               &acpi_table_attr_list);
377                 }
378         } while (!result);
379         kobject_uevent(tables_kobj, KOBJ_ADD);
380         kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
381         result = acpi_install_table_handler(acpi_sysfs_table_handler, NULL);
382
383         return result == AE_OK ? 0 : -EINVAL;
384 err_dynamic_tables:
385         kobject_put(tables_kobj);
386 err:
387         return -ENOMEM;
388 }
389
390 /*
391  * Detailed ACPI IRQ counters:
392  * /sys/firmware/acpi/interrupts/
393  */
394
395 u32 acpi_irq_handled;
396 u32 acpi_irq_not_handled;
397
398 #define COUNT_GPE 0
399 #define COUNT_SCI 1             /* acpi_irq_handled */
400 #define COUNT_SCI_NOT 2         /* acpi_irq_not_handled */
401 #define COUNT_ERROR 3           /* other */
402 #define NUM_COUNTERS_EXTRA 4
403
404 struct event_counter {
405         u32 count;
406         u32 flags;
407 };
408
409 static struct event_counter *all_counters;
410 static u32 num_gpes;
411 static u32 num_counters;
412 static struct attribute **all_attrs;
413 static u32 acpi_gpe_count;
414
415 static struct attribute_group interrupt_stats_attr_group = {
416         .name = "interrupts",
417 };
418
419 static struct kobj_attribute *counter_attrs;
420
421 static void delete_gpe_attr_array(void)
422 {
423         struct event_counter *tmp = all_counters;
424
425         all_counters = NULL;
426         kfree(tmp);
427
428         if (counter_attrs) {
429                 int i;
430
431                 for (i = 0; i < num_gpes; i++)
432                         kfree(counter_attrs[i].attr.name);
433
434                 kfree(counter_attrs);
435         }
436         kfree(all_attrs);
437
438         return;
439 }
440
441 static void gpe_count(u32 gpe_number)
442 {
443         acpi_gpe_count++;
444
445         if (!all_counters)
446                 return;
447
448         if (gpe_number < num_gpes)
449                 all_counters[gpe_number].count++;
450         else
451                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
452                              COUNT_ERROR].count++;
453
454         return;
455 }
456
457 static void fixed_event_count(u32 event_number)
458 {
459         if (!all_counters)
460                 return;
461
462         if (event_number < ACPI_NUM_FIXED_EVENTS)
463                 all_counters[num_gpes + event_number].count++;
464         else
465                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
466                              COUNT_ERROR].count++;
467
468         return;
469 }
470
471 static void acpi_gbl_event_handler(u32 event_type, acpi_handle device,
472         u32 event_number, void *context)
473 {
474         if (event_type == ACPI_EVENT_TYPE_GPE)
475                 gpe_count(event_number);
476
477         if (event_type == ACPI_EVENT_TYPE_FIXED)
478                 fixed_event_count(event_number);
479 }
480
481 static int get_status(u32 index, acpi_event_status *status,
482                       acpi_handle *handle)
483 {
484         int result = 0;
485
486         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
487                 goto end;
488
489         if (index < num_gpes) {
490                 result = acpi_get_gpe_device(index, handle);
491                 if (result) {
492                         ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
493                                         "Invalid GPE 0x%x\n", index));
494                         goto end;
495                 }
496                 result = acpi_get_gpe_status(*handle, index, status);
497         } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
498                 result = acpi_get_event_status(index - num_gpes, status);
499
500 end:
501         return result;
502 }
503
504 static ssize_t counter_show(struct kobject *kobj,
505                             struct kobj_attribute *attr, char *buf)
506 {
507         int index = attr - counter_attrs;
508         int size;
509         acpi_handle handle;
510         acpi_event_status status;
511         int result = 0;
512
513         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
514             acpi_irq_handled;
515         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
516             acpi_irq_not_handled;
517         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
518             acpi_gpe_count;
519         size = sprintf(buf, "%8d", all_counters[index].count);
520
521         /* "gpe_all" or "sci" */
522         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
523                 goto end;
524
525         result = get_status(index, &status, &handle);
526         if (result)
527                 goto end;
528
529         if (!(status & ACPI_EVENT_FLAG_HANDLE))
530                 size += sprintf(buf + size, "   invalid");
531         else if (status & ACPI_EVENT_FLAG_ENABLED)
532                 size += sprintf(buf + size, "   enabled");
533         else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
534                 size += sprintf(buf + size, "   wake_enabled");
535         else
536                 size += sprintf(buf + size, "   disabled");
537
538 end:
539         size += sprintf(buf + size, "\n");
540         return result ? result : size;
541 }
542
543 /*
544  * counter_set() sets the specified counter.
545  * setting the total "sci" file to any value clears all counters.
546  * enable/disable/clear a gpe/fixed event in user space.
547  */
548 static ssize_t counter_set(struct kobject *kobj,
549                            struct kobj_attribute *attr, const char *buf,
550                            size_t size)
551 {
552         int index = attr - counter_attrs;
553         acpi_event_status status;
554         acpi_handle handle;
555         int result = 0;
556
557         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
558                 int i;
559                 for (i = 0; i < num_counters; ++i)
560                         all_counters[i].count = 0;
561                 acpi_gpe_count = 0;
562                 acpi_irq_handled = 0;
563                 acpi_irq_not_handled = 0;
564                 goto end;
565         }
566
567         /* show the event status for both GPEs and Fixed Events */
568         result = get_status(index, &status, &handle);
569         if (result)
570                 goto end;
571
572         if (!(status & ACPI_EVENT_FLAG_HANDLE)) {
573                 printk(KERN_WARNING PREFIX
574                        "Can not change Invalid GPE/Fixed Event status\n");
575                 return -EINVAL;
576         }
577
578         if (index < num_gpes) {
579                 if (!strcmp(buf, "disable\n") &&
580                     (status & ACPI_EVENT_FLAG_ENABLED))
581                         result = acpi_disable_gpe(handle, index);
582                 else if (!strcmp(buf, "enable\n") &&
583                          !(status & ACPI_EVENT_FLAG_ENABLED))
584                         result = acpi_enable_gpe(handle, index);
585                 else if (!strcmp(buf, "clear\n") &&
586                          (status & ACPI_EVENT_FLAG_SET))
587                         result = acpi_clear_gpe(handle, index);
588                 else
589                         all_counters[index].count = strtoul(buf, NULL, 0);
590         } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
591                 int event = index - num_gpes;
592                 if (!strcmp(buf, "disable\n") &&
593                     (status & ACPI_EVENT_FLAG_ENABLED))
594                         result = acpi_disable_event(event, ACPI_NOT_ISR);
595                 else if (!strcmp(buf, "enable\n") &&
596                          !(status & ACPI_EVENT_FLAG_ENABLED))
597                         result = acpi_enable_event(event, ACPI_NOT_ISR);
598                 else if (!strcmp(buf, "clear\n") &&
599                          (status & ACPI_EVENT_FLAG_SET))
600                         result = acpi_clear_event(event);
601                 else
602                         all_counters[index].count = strtoul(buf, NULL, 0);
603         } else
604                 all_counters[index].count = strtoul(buf, NULL, 0);
605
606         if (ACPI_FAILURE(result))
607                 result = -EINVAL;
608 end:
609         return result ? result : size;
610 }
611
612 void acpi_irq_stats_init(void)
613 {
614         acpi_status status;
615         int i;
616
617         if (all_counters)
618                 return;
619
620         num_gpes = acpi_current_gpe_count;
621         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
622
623         all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
624                             GFP_KERNEL);
625         if (all_attrs == NULL)
626                 return;
627
628         all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
629                                GFP_KERNEL);
630         if (all_counters == NULL)
631                 goto fail;
632
633         status = acpi_install_global_event_handler(acpi_gbl_event_handler, NULL);
634         if (ACPI_FAILURE(status))
635                 goto fail;
636
637         counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
638                                 GFP_KERNEL);
639         if (counter_attrs == NULL)
640                 goto fail;
641
642         for (i = 0; i < num_counters; ++i) {
643                 char buffer[12];
644                 char *name;
645
646                 if (i < num_gpes)
647                         sprintf(buffer, "gpe%02X", i);
648                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
649                         sprintf(buffer, "ff_pmtimer");
650                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
651                         sprintf(buffer, "ff_gbl_lock");
652                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
653                         sprintf(buffer, "ff_pwr_btn");
654                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
655                         sprintf(buffer, "ff_slp_btn");
656                 else if (i == num_gpes + ACPI_EVENT_RTC)
657                         sprintf(buffer, "ff_rt_clk");
658                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
659                         sprintf(buffer, "gpe_all");
660                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
661                         sprintf(buffer, "sci");
662                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
663                         sprintf(buffer, "sci_not");
664                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
665                         sprintf(buffer, "error");
666                 else
667                         sprintf(buffer, "bug%02X", i);
668
669                 name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
670                 if (name == NULL)
671                         goto fail;
672                 strncpy(name, buffer, strlen(buffer) + 1);
673
674                 sysfs_attr_init(&counter_attrs[i].attr);
675                 counter_attrs[i].attr.name = name;
676                 counter_attrs[i].attr.mode = 0644;
677                 counter_attrs[i].show = counter_show;
678                 counter_attrs[i].store = counter_set;
679
680                 all_attrs[i] = &counter_attrs[i].attr;
681         }
682
683         interrupt_stats_attr_group.attrs = all_attrs;
684         if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
685                 return;
686
687 fail:
688         delete_gpe_attr_array();
689         return;
690 }
691
692 static void __exit interrupt_stats_exit(void)
693 {
694         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
695
696         delete_gpe_attr_array();
697
698         return;
699 }
700
701 int __init acpi_sysfs_init(void)
702 {
703         int result;
704
705         result = acpi_tables_sysfs_init();
706
707         return result;
708 }