xref: /linux/drivers/acpi/sysfs.c (revision b889fcf63cb62e7fdb7816565e28f44dbe4a76a5)
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 const struct kernel_param_ops param_ops_debug_layer = {
153 	.set = param_set_uint,
154 	.get = param_get_debug_layer,
155 };
156 
157 static const 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", sizeof("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", sizeof("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 
224 /* /sys/modules/acpi/parameters/aml_debug_output */
225 
226 module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
227 		   bool, 0644);
228 MODULE_PARM_DESC(aml_debug_output,
229 		 "To enable/disable the ACPI Debug Object output.");
230 
231 /* /sys/module/acpi/parameters/acpica_version */
232 static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
233 {
234 	int result;
235 
236 	result = sprintf(buffer, "%x", ACPI_CA_VERSION);
237 
238 	return result;
239 }
240 
241 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
242 
243 /*
244  * ACPI table sysfs I/F:
245  * /sys/firmware/acpi/tables/
246  * /sys/firmware/acpi/tables/dynamic/
247  */
248 
249 static LIST_HEAD(acpi_table_attr_list);
250 static struct kobject *tables_kobj;
251 static struct kobject *dynamic_tables_kobj;
252 
253 struct acpi_table_attr {
254 	struct bin_attribute attr;
255 	char name[8];
256 	int instance;
257 	struct list_head node;
258 };
259 
260 static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
261 			       struct bin_attribute *bin_attr, char *buf,
262 			       loff_t offset, size_t count)
263 {
264 	struct acpi_table_attr *table_attr =
265 	    container_of(bin_attr, struct acpi_table_attr, attr);
266 	struct acpi_table_header *table_header = NULL;
267 	acpi_status status;
268 	char name[ACPI_NAME_SIZE];
269 
270 	if (strncmp(table_attr->name, "NULL", 4))
271 		memcpy(name, table_attr->name, ACPI_NAME_SIZE);
272 	else
273 		memcpy(name, "\0\0\0\0", 4);
274 
275 	status = acpi_get_table(name, table_attr->instance, &table_header);
276 	if (ACPI_FAILURE(status))
277 		return -ENODEV;
278 
279 	return memory_read_from_buffer(buf, count, &offset,
280 				       table_header, table_header->length);
281 }
282 
283 static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
284 				 struct acpi_table_header *table_header)
285 {
286 	struct acpi_table_header *header = NULL;
287 	struct acpi_table_attr *attr = NULL;
288 
289 	sysfs_attr_init(&table_attr->attr.attr);
290 	if (table_header->signature[0] != '\0')
291 		memcpy(table_attr->name, table_header->signature,
292 		       ACPI_NAME_SIZE);
293 	else
294 		memcpy(table_attr->name, "NULL", 4);
295 
296 	list_for_each_entry(attr, &acpi_table_attr_list, node) {
297 		if (!memcmp(table_attr->name, attr->name, ACPI_NAME_SIZE))
298 			if (table_attr->instance < attr->instance)
299 				table_attr->instance = attr->instance;
300 	}
301 	table_attr->instance++;
302 
303 	if (table_attr->instance > 1 || (table_attr->instance == 1 &&
304 					 !acpi_get_table
305 					 (table_header->signature, 2, &header)))
306 		sprintf(table_attr->name + ACPI_NAME_SIZE, "%d",
307 			table_attr->instance);
308 
309 	table_attr->attr.size = 0;
310 	table_attr->attr.read = acpi_table_show;
311 	table_attr->attr.attr.name = table_attr->name;
312 	table_attr->attr.attr.mode = 0400;
313 
314 	return;
315 }
316 
317 static acpi_status
318 acpi_sysfs_table_handler(u32 event, void *table, void *context)
319 {
320 	struct acpi_table_attr *table_attr;
321 
322 	switch (event) {
323 	case ACPI_TABLE_EVENT_LOAD:
324 		table_attr =
325 		    kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
326 		if (!table_attr)
327 			return AE_NO_MEMORY;
328 
329 		acpi_table_attr_init(table_attr, table);
330 		if (sysfs_create_bin_file(dynamic_tables_kobj,
331 					  &table_attr->attr)) {
332 			kfree(table_attr);
333 			return AE_ERROR;
334 		} else
335 			list_add_tail(&table_attr->node, &acpi_table_attr_list);
336 		break;
337 	case ACPI_TABLE_EVENT_UNLOAD:
338 		/*
339 		 * we do not need to do anything right now
340 		 * because the table is not deleted from the
341 		 * global table list when unloading it.
342 		 */
343 		break;
344 	default:
345 		return AE_BAD_PARAMETER;
346 	}
347 	return AE_OK;
348 }
349 
350 static int acpi_tables_sysfs_init(void)
351 {
352 	struct acpi_table_attr *table_attr;
353 	struct acpi_table_header *table_header = NULL;
354 	int table_index = 0;
355 	int result;
356 
357 	tables_kobj = kobject_create_and_add("tables", acpi_kobj);
358 	if (!tables_kobj)
359 		goto err;
360 
361 	dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
362 	if (!dynamic_tables_kobj)
363 		goto err_dynamic_tables;
364 
365 	do {
366 		result = acpi_get_table_by_index(table_index, &table_header);
367 		if (!result) {
368 			table_index++;
369 			table_attr = NULL;
370 			table_attr =
371 			    kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
372 			if (!table_attr)
373 				return -ENOMEM;
374 
375 			acpi_table_attr_init(table_attr, table_header);
376 			result =
377 			    sysfs_create_bin_file(tables_kobj,
378 						  &table_attr->attr);
379 			if (result) {
380 				kfree(table_attr);
381 				return result;
382 			} else
383 				list_add_tail(&table_attr->node,
384 					      &acpi_table_attr_list);
385 		}
386 	} while (!result);
387 	kobject_uevent(tables_kobj, KOBJ_ADD);
388 	kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
389 	result = acpi_install_table_handler(acpi_sysfs_table_handler, NULL);
390 
391 	return result == AE_OK ? 0 : -EINVAL;
392 err_dynamic_tables:
393 	kobject_put(tables_kobj);
394 err:
395 	return -ENOMEM;
396 }
397 
398 /*
399  * Detailed ACPI IRQ counters:
400  * /sys/firmware/acpi/interrupts/
401  */
402 
403 u32 acpi_irq_handled;
404 u32 acpi_irq_not_handled;
405 
406 #define COUNT_GPE 0
407 #define COUNT_SCI 1		/* acpi_irq_handled */
408 #define COUNT_SCI_NOT 2		/* acpi_irq_not_handled */
409 #define COUNT_ERROR 3		/* other */
410 #define NUM_COUNTERS_EXTRA 4
411 
412 struct event_counter {
413 	u32 count;
414 	u32 flags;
415 };
416 
417 static struct event_counter *all_counters;
418 static u32 num_gpes;
419 static u32 num_counters;
420 static struct attribute **all_attrs;
421 static u32 acpi_gpe_count;
422 
423 static struct attribute_group interrupt_stats_attr_group = {
424 	.name = "interrupts",
425 };
426 
427 static struct kobj_attribute *counter_attrs;
428 
429 static void delete_gpe_attr_array(void)
430 {
431 	struct event_counter *tmp = all_counters;
432 
433 	all_counters = NULL;
434 	kfree(tmp);
435 
436 	if (counter_attrs) {
437 		int i;
438 
439 		for (i = 0; i < num_gpes; i++)
440 			kfree(counter_attrs[i].attr.name);
441 
442 		kfree(counter_attrs);
443 	}
444 	kfree(all_attrs);
445 
446 	return;
447 }
448 
449 static void gpe_count(u32 gpe_number)
450 {
451 	acpi_gpe_count++;
452 
453 	if (!all_counters)
454 		return;
455 
456 	if (gpe_number < num_gpes)
457 		all_counters[gpe_number].count++;
458 	else
459 		all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
460 			     COUNT_ERROR].count++;
461 
462 	return;
463 }
464 
465 static void fixed_event_count(u32 event_number)
466 {
467 	if (!all_counters)
468 		return;
469 
470 	if (event_number < ACPI_NUM_FIXED_EVENTS)
471 		all_counters[num_gpes + event_number].count++;
472 	else
473 		all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
474 			     COUNT_ERROR].count++;
475 
476 	return;
477 }
478 
479 static void acpi_global_event_handler(u32 event_type, acpi_handle device,
480 	u32 event_number, void *context)
481 {
482 	if (event_type == ACPI_EVENT_TYPE_GPE)
483 		gpe_count(event_number);
484 
485 	if (event_type == ACPI_EVENT_TYPE_FIXED)
486 		fixed_event_count(event_number);
487 }
488 
489 static int get_status(u32 index, acpi_event_status *status,
490 		      acpi_handle *handle)
491 {
492 	int result = 0;
493 
494 	if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
495 		goto end;
496 
497 	if (index < num_gpes) {
498 		result = acpi_get_gpe_device(index, handle);
499 		if (result) {
500 			ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
501 					"Invalid GPE 0x%x\n", index));
502 			goto end;
503 		}
504 		result = acpi_get_gpe_status(*handle, index, status);
505 	} else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
506 		result = acpi_get_event_status(index - num_gpes, status);
507 
508 end:
509 	return result;
510 }
511 
512 static ssize_t counter_show(struct kobject *kobj,
513 			    struct kobj_attribute *attr, char *buf)
514 {
515 	int index = attr - counter_attrs;
516 	int size;
517 	acpi_handle handle;
518 	acpi_event_status status;
519 	int result = 0;
520 
521 	all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
522 	    acpi_irq_handled;
523 	all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
524 	    acpi_irq_not_handled;
525 	all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
526 	    acpi_gpe_count;
527 	size = sprintf(buf, "%8d", all_counters[index].count);
528 
529 	/* "gpe_all" or "sci" */
530 	if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
531 		goto end;
532 
533 	result = get_status(index, &status, &handle);
534 	if (result)
535 		goto end;
536 
537 	if (!(status & ACPI_EVENT_FLAG_HANDLE))
538 		size += sprintf(buf + size, "   invalid");
539 	else if (status & ACPI_EVENT_FLAG_ENABLED)
540 		size += sprintf(buf + size, "   enabled");
541 	else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
542 		size += sprintf(buf + size, "   wake_enabled");
543 	else
544 		size += sprintf(buf + size, "   disabled");
545 
546 end:
547 	size += sprintf(buf + size, "\n");
548 	return result ? result : size;
549 }
550 
551 /*
552  * counter_set() sets the specified counter.
553  * setting the total "sci" file to any value clears all counters.
554  * enable/disable/clear a gpe/fixed event in user space.
555  */
556 static ssize_t counter_set(struct kobject *kobj,
557 			   struct kobj_attribute *attr, const char *buf,
558 			   size_t size)
559 {
560 	int index = attr - counter_attrs;
561 	acpi_event_status status;
562 	acpi_handle handle;
563 	int result = 0;
564 
565 	if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
566 		int i;
567 		for (i = 0; i < num_counters; ++i)
568 			all_counters[i].count = 0;
569 		acpi_gpe_count = 0;
570 		acpi_irq_handled = 0;
571 		acpi_irq_not_handled = 0;
572 		goto end;
573 	}
574 
575 	/* show the event status for both GPEs and Fixed Events */
576 	result = get_status(index, &status, &handle);
577 	if (result)
578 		goto end;
579 
580 	if (!(status & ACPI_EVENT_FLAG_HANDLE)) {
581 		printk(KERN_WARNING PREFIX
582 		       "Can not change Invalid GPE/Fixed Event status\n");
583 		return -EINVAL;
584 	}
585 
586 	if (index < num_gpes) {
587 		if (!strcmp(buf, "disable\n") &&
588 		    (status & ACPI_EVENT_FLAG_ENABLED))
589 			result = acpi_disable_gpe(handle, index);
590 		else if (!strcmp(buf, "enable\n") &&
591 			 !(status & ACPI_EVENT_FLAG_ENABLED))
592 			result = acpi_enable_gpe(handle, index);
593 		else if (!strcmp(buf, "clear\n") &&
594 			 (status & ACPI_EVENT_FLAG_SET))
595 			result = acpi_clear_gpe(handle, index);
596 		else
597 			all_counters[index].count = strtoul(buf, NULL, 0);
598 	} else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
599 		int event = index - num_gpes;
600 		if (!strcmp(buf, "disable\n") &&
601 		    (status & ACPI_EVENT_FLAG_ENABLED))
602 			result = acpi_disable_event(event, ACPI_NOT_ISR);
603 		else if (!strcmp(buf, "enable\n") &&
604 			 !(status & ACPI_EVENT_FLAG_ENABLED))
605 			result = acpi_enable_event(event, ACPI_NOT_ISR);
606 		else if (!strcmp(buf, "clear\n") &&
607 			 (status & ACPI_EVENT_FLAG_SET))
608 			result = acpi_clear_event(event);
609 		else
610 			all_counters[index].count = strtoul(buf, NULL, 0);
611 	} else
612 		all_counters[index].count = strtoul(buf, NULL, 0);
613 
614 	if (ACPI_FAILURE(result))
615 		result = -EINVAL;
616 end:
617 	return result ? result : size;
618 }
619 
620 void acpi_irq_stats_init(void)
621 {
622 	acpi_status status;
623 	int i;
624 
625 	if (all_counters)
626 		return;
627 
628 	num_gpes = acpi_current_gpe_count;
629 	num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
630 
631 	all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
632 			    GFP_KERNEL);
633 	if (all_attrs == NULL)
634 		return;
635 
636 	all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
637 			       GFP_KERNEL);
638 	if (all_counters == NULL)
639 		goto fail;
640 
641 	status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
642 	if (ACPI_FAILURE(status))
643 		goto fail;
644 
645 	counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
646 				GFP_KERNEL);
647 	if (counter_attrs == NULL)
648 		goto fail;
649 
650 	for (i = 0; i < num_counters; ++i) {
651 		char buffer[12];
652 		char *name;
653 
654 		if (i < num_gpes)
655 			sprintf(buffer, "gpe%02X", i);
656 		else if (i == num_gpes + ACPI_EVENT_PMTIMER)
657 			sprintf(buffer, "ff_pmtimer");
658 		else if (i == num_gpes + ACPI_EVENT_GLOBAL)
659 			sprintf(buffer, "ff_gbl_lock");
660 		else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
661 			sprintf(buffer, "ff_pwr_btn");
662 		else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
663 			sprintf(buffer, "ff_slp_btn");
664 		else if (i == num_gpes + ACPI_EVENT_RTC)
665 			sprintf(buffer, "ff_rt_clk");
666 		else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
667 			sprintf(buffer, "gpe_all");
668 		else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
669 			sprintf(buffer, "sci");
670 		else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
671 			sprintf(buffer, "sci_not");
672 		else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
673 			sprintf(buffer, "error");
674 		else
675 			sprintf(buffer, "bug%02X", i);
676 
677 		name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
678 		if (name == NULL)
679 			goto fail;
680 		strncpy(name, buffer, strlen(buffer) + 1);
681 
682 		sysfs_attr_init(&counter_attrs[i].attr);
683 		counter_attrs[i].attr.name = name;
684 		counter_attrs[i].attr.mode = 0644;
685 		counter_attrs[i].show = counter_show;
686 		counter_attrs[i].store = counter_set;
687 
688 		all_attrs[i] = &counter_attrs[i].attr;
689 	}
690 
691 	interrupt_stats_attr_group.attrs = all_attrs;
692 	if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
693 		return;
694 
695 fail:
696 	delete_gpe_attr_array();
697 	return;
698 }
699 
700 static void __exit interrupt_stats_exit(void)
701 {
702 	sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
703 
704 	delete_gpe_attr_array();
705 
706 	return;
707 }
708 
709 static ssize_t
710 acpi_show_profile(struct device *dev, struct device_attribute *attr,
711 		  char *buf)
712 {
713 	return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
714 }
715 
716 static const struct device_attribute pm_profile_attr =
717 	__ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL);
718 
719 int __init acpi_sysfs_init(void)
720 {
721 	int result;
722 
723 	result = acpi_tables_sysfs_init();
724 	if (result)
725 		return result;
726 	result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
727 	return result;
728 }
729