Merge branches 'acpi-button', 'acpica' and 'acpi-sysfs'
[sfrench/cifs-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 <linux/acpi.h>
9
10 #include "internal.h"
11
12 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
13 ACPI_MODULE_NAME("sysfs");
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         ACPI_DEBUG_INIT(ACPI_LV_REPAIR),
73         ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT),
74
75         ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
76         ACPI_DEBUG_INIT(ACPI_LV_PARSE),
77         ACPI_DEBUG_INIT(ACPI_LV_LOAD),
78         ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
79         ACPI_DEBUG_INIT(ACPI_LV_EXEC),
80         ACPI_DEBUG_INIT(ACPI_LV_NAMES),
81         ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
82         ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
83         ACPI_DEBUG_INIT(ACPI_LV_TABLES),
84         ACPI_DEBUG_INIT(ACPI_LV_VALUES),
85         ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
86         ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
87         ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
88         ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
89
90         ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
91         ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
92         ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
93
94         ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
95         ACPI_DEBUG_INIT(ACPI_LV_THREADS),
96         ACPI_DEBUG_INIT(ACPI_LV_IO),
97         ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
98
99         ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
100         ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
101         ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
102         ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
103 };
104
105 static int param_get_debug_layer(char *buffer, const struct kernel_param *kp)
106 {
107         int result = 0;
108         int i;
109
110         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
111
112         for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
113                 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
114                                   acpi_debug_layers[i].name,
115                                   acpi_debug_layers[i].value,
116                                   (acpi_dbg_layer & acpi_debug_layers[i].value)
117                                   ? '*' : ' ');
118         }
119         result +=
120             sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
121                     ACPI_ALL_DRIVERS,
122                     (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
123                     ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS)
124                     == 0 ? ' ' : '-');
125         result +=
126             sprintf(buffer + result,
127                     "--\ndebug_layer = 0x%08X ( * = enabled)\n",
128                     acpi_dbg_layer);
129
130         return result;
131 }
132
133 static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
134 {
135         int result = 0;
136         int i;
137
138         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
139
140         for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
141                 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
142                                   acpi_debug_levels[i].name,
143                                   acpi_debug_levels[i].value,
144                                   (acpi_dbg_level & acpi_debug_levels[i].value)
145                                   ? '*' : ' ');
146         }
147         result +=
148             sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n",
149                     acpi_dbg_level);
150
151         return result;
152 }
153
154 static const struct kernel_param_ops param_ops_debug_layer = {
155         .set = param_set_uint,
156         .get = param_get_debug_layer,
157 };
158
159 static const struct kernel_param_ops param_ops_debug_level = {
160         .set = param_set_uint,
161         .get = param_get_debug_level,
162 };
163
164 module_param_cb(debug_layer, &param_ops_debug_layer, &acpi_dbg_layer, 0644);
165 module_param_cb(debug_level, &param_ops_debug_level, &acpi_dbg_level, 0644);
166
167 static char trace_method_name[1024];
168
169 int param_set_trace_method_name(const char *val, const struct kernel_param *kp)
170 {
171         u32 saved_flags = 0;
172         bool is_abs_path = true;
173
174         if (*val != '\\')
175                 is_abs_path = false;
176
177         if ((is_abs_path && strlen(val) > 1023) ||
178             (!is_abs_path && strlen(val) > 1022)) {
179                 pr_err("%s: string parameter too long\n", kp->name);
180                 return -ENOSPC;
181         }
182
183         /*
184          * It's not safe to update acpi_gbl_trace_method_name without
185          * having the tracer stopped, so we save the original tracer
186          * state and disable it.
187          */
188         saved_flags = acpi_gbl_trace_flags;
189         (void)acpi_debug_trace(NULL,
190                                acpi_gbl_trace_dbg_level,
191                                acpi_gbl_trace_dbg_layer,
192                                0);
193
194         /* This is a hack.  We can't kmalloc in early boot. */
195         if (is_abs_path)
196                 strcpy(trace_method_name, val);
197         else {
198                 trace_method_name[0] = '\\';
199                 strcpy(trace_method_name+1, val);
200         }
201
202         /* Restore the original tracer state */
203         (void)acpi_debug_trace(trace_method_name,
204                                acpi_gbl_trace_dbg_level,
205                                acpi_gbl_trace_dbg_layer,
206                                saved_flags);
207
208         return 0;
209 }
210
211 static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp)
212 {
213         return scnprintf(buffer, PAGE_SIZE, "%s", acpi_gbl_trace_method_name);
214 }
215
216 static const struct kernel_param_ops param_ops_trace_method = {
217         .set = param_set_trace_method_name,
218         .get = param_get_trace_method_name,
219 };
220
221 static const struct kernel_param_ops param_ops_trace_attrib = {
222         .set = param_set_uint,
223         .get = param_get_uint,
224 };
225
226 module_param_cb(trace_method_name, &param_ops_trace_method, &trace_method_name, 0644);
227 module_param_cb(trace_debug_layer, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
228 module_param_cb(trace_debug_level, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
229
230 static int param_set_trace_state(const char *val, struct kernel_param *kp)
231 {
232         acpi_status status;
233         const char *method = trace_method_name;
234         u32 flags = 0;
235
236 /* So "xxx-once" comparison should go prior than "xxx" comparison */
237 #define acpi_compare_param(val, key)    \
238         strncmp((val), (key), sizeof(key) - 1)
239
240         if (!acpi_compare_param(val, "enable")) {
241                 method = NULL;
242                 flags = ACPI_TRACE_ENABLED;
243         } else if (!acpi_compare_param(val, "disable"))
244                 method = NULL;
245         else if (!acpi_compare_param(val, "method-once"))
246                 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT;
247         else if (!acpi_compare_param(val, "method"))
248                 flags = ACPI_TRACE_ENABLED;
249         else if (!acpi_compare_param(val, "opcode-once"))
250                 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE;
251         else if (!acpi_compare_param(val, "opcode"))
252                 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE;
253         else
254                 return -EINVAL;
255
256         status = acpi_debug_trace(method,
257                                   acpi_gbl_trace_dbg_level,
258                                   acpi_gbl_trace_dbg_layer,
259                                   flags);
260         if (ACPI_FAILURE(status))
261                 return -EBUSY;
262
263         return 0;
264 }
265
266 static int param_get_trace_state(char *buffer, struct kernel_param *kp)
267 {
268         if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED))
269                 return sprintf(buffer, "disable");
270         else {
271                 if (acpi_gbl_trace_method_name) {
272                         if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
273                                 return sprintf(buffer, "method-once");
274                         else
275                                 return sprintf(buffer, "method");
276                 } else
277                         return sprintf(buffer, "enable");
278         }
279         return 0;
280 }
281
282 module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
283                   NULL, 0644);
284 #endif /* CONFIG_ACPI_DEBUG */
285
286
287 /* /sys/modules/acpi/parameters/aml_debug_output */
288
289 module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
290                    byte, 0644);
291 MODULE_PARM_DESC(aml_debug_output,
292                  "To enable/disable the ACPI Debug Object output.");
293
294 /* /sys/module/acpi/parameters/acpica_version */
295 static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
296 {
297         int result;
298
299         result = sprintf(buffer, "%x", ACPI_CA_VERSION);
300
301         return result;
302 }
303
304 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
305
306 /*
307  * ACPI table sysfs I/F:
308  * /sys/firmware/acpi/tables/
309  * /sys/firmware/acpi/tables/dynamic/
310  */
311
312 static LIST_HEAD(acpi_table_attr_list);
313 static struct kobject *tables_kobj;
314 static struct kobject *dynamic_tables_kobj;
315 static struct kobject *hotplug_kobj;
316
317 #define ACPI_MAX_TABLE_INSTANCES        999
318 #define ACPI_INST_SIZE                  4 /* including trailing 0 */
319
320 struct acpi_table_attr {
321         struct bin_attribute attr;
322         char name[ACPI_NAME_SIZE];
323         int instance;
324         char filename[ACPI_NAME_SIZE+ACPI_INST_SIZE];
325         struct list_head node;
326 };
327
328 static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
329                                struct bin_attribute *bin_attr, char *buf,
330                                loff_t offset, size_t count)
331 {
332         struct acpi_table_attr *table_attr =
333             container_of(bin_attr, struct acpi_table_attr, attr);
334         struct acpi_table_header *table_header = NULL;
335         acpi_status status;
336         ssize_t rc;
337
338         status = acpi_get_table(table_attr->name, table_attr->instance,
339                                 &table_header);
340         if (ACPI_FAILURE(status))
341                 return -ENODEV;
342
343         rc = memory_read_from_buffer(buf, count, &offset, table_header,
344                         table_header->length);
345         acpi_put_table(table_header);
346         return rc;
347 }
348
349 static int acpi_table_attr_init(struct kobject *tables_obj,
350                                 struct acpi_table_attr *table_attr,
351                                 struct acpi_table_header *table_header)
352 {
353         struct acpi_table_header *header = NULL;
354         struct acpi_table_attr *attr = NULL;
355         char instance_str[ACPI_INST_SIZE];
356
357         sysfs_attr_init(&table_attr->attr.attr);
358         ACPI_MOVE_NAME(table_attr->name, table_header->signature);
359
360         list_for_each_entry(attr, &acpi_table_attr_list, node) {
361                 if (ACPI_COMPARE_NAME(table_attr->name, attr->name))
362                         if (table_attr->instance < attr->instance)
363                                 table_attr->instance = attr->instance;
364         }
365         table_attr->instance++;
366         if (table_attr->instance > ACPI_MAX_TABLE_INSTANCES) {
367                 pr_warn("%4.4s: too many table instances\n",
368                         table_attr->name);
369                 return -ERANGE;
370         }
371
372         ACPI_MOVE_NAME(table_attr->filename, table_header->signature);
373         table_attr->filename[ACPI_NAME_SIZE] = '\0';
374         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
375                                          !acpi_get_table
376                                          (table_header->signature, 2, &header))) {
377                 snprintf(instance_str, sizeof(instance_str), "%u",
378                          table_attr->instance);
379                 strcat(table_attr->filename, instance_str);
380         }
381
382         table_attr->attr.size = table_header->length;
383         table_attr->attr.read = acpi_table_show;
384         table_attr->attr.attr.name = table_attr->filename;
385         table_attr->attr.attr.mode = 0400;
386
387         return sysfs_create_bin_file(tables_obj, &table_attr->attr);
388 }
389
390 acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context)
391 {
392         struct acpi_table_attr *table_attr;
393
394         switch (event) {
395         case ACPI_TABLE_EVENT_INSTALL:
396                 table_attr =
397                     kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
398                 if (!table_attr)
399                         return AE_NO_MEMORY;
400
401                 if (acpi_table_attr_init(dynamic_tables_kobj,
402                                          table_attr, table)) {
403                         kfree(table_attr);
404                         return AE_ERROR;
405                 }
406                 list_add_tail(&table_attr->node, &acpi_table_attr_list);
407                 break;
408         case ACPI_TABLE_EVENT_LOAD:
409         case ACPI_TABLE_EVENT_UNLOAD:
410         case ACPI_TABLE_EVENT_UNINSTALL:
411                 /*
412                  * we do not need to do anything right now
413                  * because the table is not deleted from the
414                  * global table list when unloading it.
415                  */
416                 break;
417         default:
418                 return AE_BAD_PARAMETER;
419         }
420         return AE_OK;
421 }
422
423 static int acpi_tables_sysfs_init(void)
424 {
425         struct acpi_table_attr *table_attr;
426         struct acpi_table_header *table_header = NULL;
427         int table_index;
428         acpi_status status;
429         int ret;
430
431         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
432         if (!tables_kobj)
433                 goto err;
434
435         dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
436         if (!dynamic_tables_kobj)
437                 goto err_dynamic_tables;
438
439         for (table_index = 0;; table_index++) {
440                 status = acpi_get_table_by_index(table_index, &table_header);
441
442                 if (status == AE_BAD_PARAMETER)
443                         break;
444
445                 if (ACPI_FAILURE(status))
446                         continue;
447
448                 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
449                 if (!table_attr)
450                         return -ENOMEM;
451
452                 ret = acpi_table_attr_init(tables_kobj,
453                                            table_attr, table_header);
454                 if (ret) {
455                         kfree(table_attr);
456                         return ret;
457                 }
458                 list_add_tail(&table_attr->node, &acpi_table_attr_list);
459         }
460
461         kobject_uevent(tables_kobj, KOBJ_ADD);
462         kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
463
464         return 0;
465 err_dynamic_tables:
466         kobject_put(tables_kobj);
467 err:
468         return -ENOMEM;
469 }
470
471 /*
472  * Detailed ACPI IRQ counters:
473  * /sys/firmware/acpi/interrupts/
474  */
475
476 u32 acpi_irq_handled;
477 u32 acpi_irq_not_handled;
478
479 #define COUNT_GPE 0
480 #define COUNT_SCI 1             /* acpi_irq_handled */
481 #define COUNT_SCI_NOT 2         /* acpi_irq_not_handled */
482 #define COUNT_ERROR 3           /* other */
483 #define NUM_COUNTERS_EXTRA 4
484
485 struct event_counter {
486         u32 count;
487         u32 flags;
488 };
489
490 static struct event_counter *all_counters;
491 static u32 num_gpes;
492 static u32 num_counters;
493 static struct attribute **all_attrs;
494 static u32 acpi_gpe_count;
495
496 static struct attribute_group interrupt_stats_attr_group = {
497         .name = "interrupts",
498 };
499
500 static struct kobj_attribute *counter_attrs;
501
502 static void delete_gpe_attr_array(void)
503 {
504         struct event_counter *tmp = all_counters;
505
506         all_counters = NULL;
507         kfree(tmp);
508
509         if (counter_attrs) {
510                 int i;
511
512                 for (i = 0; i < num_gpes; i++)
513                         kfree(counter_attrs[i].attr.name);
514
515                 kfree(counter_attrs);
516         }
517         kfree(all_attrs);
518
519         return;
520 }
521
522 static void gpe_count(u32 gpe_number)
523 {
524         acpi_gpe_count++;
525
526         if (!all_counters)
527                 return;
528
529         if (gpe_number < num_gpes)
530                 all_counters[gpe_number].count++;
531         else
532                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
533                              COUNT_ERROR].count++;
534
535         return;
536 }
537
538 static void fixed_event_count(u32 event_number)
539 {
540         if (!all_counters)
541                 return;
542
543         if (event_number < ACPI_NUM_FIXED_EVENTS)
544                 all_counters[num_gpes + event_number].count++;
545         else
546                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
547                              COUNT_ERROR].count++;
548
549         return;
550 }
551
552 static void acpi_global_event_handler(u32 event_type, acpi_handle device,
553         u32 event_number, void *context)
554 {
555         if (event_type == ACPI_EVENT_TYPE_GPE)
556                 gpe_count(event_number);
557
558         if (event_type == ACPI_EVENT_TYPE_FIXED)
559                 fixed_event_count(event_number);
560 }
561
562 static int get_status(u32 index, acpi_event_status *status,
563                       acpi_handle *handle)
564 {
565         int result;
566
567         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
568                 return -EINVAL;
569
570         if (index < num_gpes) {
571                 result = acpi_get_gpe_device(index, handle);
572                 if (result) {
573                         ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
574                                         "Invalid GPE 0x%x", index));
575                         return result;
576                 }
577                 result = acpi_get_gpe_status(*handle, index, status);
578         } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
579                 result = acpi_get_event_status(index - num_gpes, status);
580
581         return result;
582 }
583
584 static ssize_t counter_show(struct kobject *kobj,
585                             struct kobj_attribute *attr, char *buf)
586 {
587         int index = attr - counter_attrs;
588         int size;
589         acpi_handle handle;
590         acpi_event_status status;
591         int result = 0;
592
593         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
594             acpi_irq_handled;
595         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
596             acpi_irq_not_handled;
597         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
598             acpi_gpe_count;
599         size = sprintf(buf, "%8u", all_counters[index].count);
600
601         /* "gpe_all" or "sci" */
602         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
603                 goto end;
604
605         result = get_status(index, &status, &handle);
606         if (result)
607                 goto end;
608
609         if (status & ACPI_EVENT_FLAG_ENABLE_SET)
610                 size += sprintf(buf + size, "  EN");
611         else
612                 size += sprintf(buf + size, "    ");
613         if (status & ACPI_EVENT_FLAG_STATUS_SET)
614                 size += sprintf(buf + size, " STS");
615         else
616                 size += sprintf(buf + size, "    ");
617
618         if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER))
619                 size += sprintf(buf + size, " invalid     ");
620         else if (status & ACPI_EVENT_FLAG_ENABLED)
621                 size += sprintf(buf + size, " enabled     ");
622         else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
623                 size += sprintf(buf + size, " wake_enabled");
624         else
625                 size += sprintf(buf + size, " disabled    ");
626         if (status & ACPI_EVENT_FLAG_MASKED)
627                 size += sprintf(buf + size, " masked  ");
628         else
629                 size += sprintf(buf + size, " unmasked");
630
631 end:
632         size += sprintf(buf + size, "\n");
633         return result ? result : size;
634 }
635
636 /*
637  * counter_set() sets the specified counter.
638  * setting the total "sci" file to any value clears all counters.
639  * enable/disable/clear a gpe/fixed event in user space.
640  */
641 static ssize_t counter_set(struct kobject *kobj,
642                            struct kobj_attribute *attr, const char *buf,
643                            size_t size)
644 {
645         int index = attr - counter_attrs;
646         acpi_event_status status;
647         acpi_handle handle;
648         int result = 0;
649         unsigned long tmp;
650
651         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
652                 int i;
653                 for (i = 0; i < num_counters; ++i)
654                         all_counters[i].count = 0;
655                 acpi_gpe_count = 0;
656                 acpi_irq_handled = 0;
657                 acpi_irq_not_handled = 0;
658                 goto end;
659         }
660
661         /* show the event status for both GPEs and Fixed Events */
662         result = get_status(index, &status, &handle);
663         if (result)
664                 goto end;
665
666         if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) {
667                 printk(KERN_WARNING PREFIX
668                        "Can not change Invalid GPE/Fixed Event status\n");
669                 return -EINVAL;
670         }
671
672         if (index < num_gpes) {
673                 if (!strcmp(buf, "disable\n") &&
674                     (status & ACPI_EVENT_FLAG_ENABLED))
675                         result = acpi_disable_gpe(handle, index);
676                 else if (!strcmp(buf, "enable\n") &&
677                          !(status & ACPI_EVENT_FLAG_ENABLED))
678                         result = acpi_enable_gpe(handle, index);
679                 else if (!strcmp(buf, "clear\n") &&
680                          (status & ACPI_EVENT_FLAG_STATUS_SET))
681                         result = acpi_clear_gpe(handle, index);
682                 else if (!strcmp(buf, "mask\n"))
683                         result = acpi_mask_gpe(handle, index, TRUE);
684                 else if (!strcmp(buf, "unmask\n"))
685                         result = acpi_mask_gpe(handle, index, FALSE);
686                 else if (!kstrtoul(buf, 0, &tmp))
687                         all_counters[index].count = tmp;
688                 else
689                         result = -EINVAL;
690         } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
691                 int event = index - num_gpes;
692                 if (!strcmp(buf, "disable\n") &&
693                     (status & ACPI_EVENT_FLAG_ENABLE_SET))
694                         result = acpi_disable_event(event, ACPI_NOT_ISR);
695                 else if (!strcmp(buf, "enable\n") &&
696                          !(status & ACPI_EVENT_FLAG_ENABLE_SET))
697                         result = acpi_enable_event(event, ACPI_NOT_ISR);
698                 else if (!strcmp(buf, "clear\n") &&
699                          (status & ACPI_EVENT_FLAG_STATUS_SET))
700                         result = acpi_clear_event(event);
701                 else if (!kstrtoul(buf, 0, &tmp))
702                         all_counters[index].count = tmp;
703                 else
704                         result = -EINVAL;
705         } else
706                 all_counters[index].count = strtoul(buf, NULL, 0);
707
708         if (ACPI_FAILURE(result))
709                 result = -EINVAL;
710 end:
711         return result ? result : size;
712 }
713
714 /*
715  * A Quirk Mechanism for GPE Flooding Prevention:
716  *
717  * Quirks may be needed to prevent GPE flooding on a specific GPE. The
718  * flooding typically cannot be detected and automatically prevented by
719  * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in
720  * the AML tables. This normally indicates a feature gap in Linux, thus
721  * instead of providing endless quirk tables, we provide a boot parameter
722  * for those who want this quirk. For example, if the users want to prevent
723  * the GPE flooding for GPE 00, they need to specify the following boot
724  * parameter:
725  *   acpi_mask_gpe=0x00
726  * The masking status can be modified by the following runtime controlling
727  * interface:
728  *   echo unmask > /sys/firmware/acpi/interrupts/gpe00
729  */
730
731 /*
732  * Currently, the GPE flooding prevention only supports to mask the GPEs
733  * numbered from 00 to 7f.
734  */
735 #define ACPI_MASKABLE_GPE_MAX   0x80
736
737 static u64 __initdata acpi_masked_gpes;
738
739 static int __init acpi_gpe_set_masked_gpes(char *val)
740 {
741         u8 gpe;
742
743         if (kstrtou8(val, 0, &gpe) || gpe > ACPI_MASKABLE_GPE_MAX)
744                 return -EINVAL;
745         acpi_masked_gpes |= ((u64)1<<gpe);
746
747         return 1;
748 }
749 __setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes);
750
751 void __init acpi_gpe_apply_masked_gpes(void)
752 {
753         acpi_handle handle;
754         acpi_status status;
755         u8 gpe;
756
757         for (gpe = 0;
758              gpe < min_t(u8, ACPI_MASKABLE_GPE_MAX, acpi_current_gpe_count);
759              gpe++) {
760                 if (acpi_masked_gpes & ((u64)1<<gpe)) {
761                         status = acpi_get_gpe_device(gpe, &handle);
762                         if (ACPI_SUCCESS(status)) {
763                                 pr_info("Masking GPE 0x%x.\n", gpe);
764                                 (void)acpi_mask_gpe(handle, gpe, TRUE);
765                         }
766                 }
767         }
768 }
769
770 void acpi_irq_stats_init(void)
771 {
772         acpi_status status;
773         int i;
774
775         if (all_counters)
776                 return;
777
778         num_gpes = acpi_current_gpe_count;
779         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
780
781         all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
782                             GFP_KERNEL);
783         if (all_attrs == NULL)
784                 return;
785
786         all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
787                                GFP_KERNEL);
788         if (all_counters == NULL)
789                 goto fail;
790
791         status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
792         if (ACPI_FAILURE(status))
793                 goto fail;
794
795         counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
796                                 GFP_KERNEL);
797         if (counter_attrs == NULL)
798                 goto fail;
799
800         for (i = 0; i < num_counters; ++i) {
801                 char buffer[12];
802                 char *name;
803
804                 if (i < num_gpes)
805                         sprintf(buffer, "gpe%02X", i);
806                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
807                         sprintf(buffer, "ff_pmtimer");
808                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
809                         sprintf(buffer, "ff_gbl_lock");
810                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
811                         sprintf(buffer, "ff_pwr_btn");
812                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
813                         sprintf(buffer, "ff_slp_btn");
814                 else if (i == num_gpes + ACPI_EVENT_RTC)
815                         sprintf(buffer, "ff_rt_clk");
816                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
817                         sprintf(buffer, "gpe_all");
818                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
819                         sprintf(buffer, "sci");
820                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
821                         sprintf(buffer, "sci_not");
822                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
823                         sprintf(buffer, "error");
824                 else
825                         sprintf(buffer, "bug%02X", i);
826
827                 name = kstrdup(buffer, GFP_KERNEL);
828                 if (name == NULL)
829                         goto fail;
830
831                 sysfs_attr_init(&counter_attrs[i].attr);
832                 counter_attrs[i].attr.name = name;
833                 counter_attrs[i].attr.mode = 0644;
834                 counter_attrs[i].show = counter_show;
835                 counter_attrs[i].store = counter_set;
836
837                 all_attrs[i] = &counter_attrs[i].attr;
838         }
839
840         interrupt_stats_attr_group.attrs = all_attrs;
841         if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
842                 return;
843
844 fail:
845         delete_gpe_attr_array();
846         return;
847 }
848
849 static void __exit interrupt_stats_exit(void)
850 {
851         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
852
853         delete_gpe_attr_array();
854
855         return;
856 }
857
858 static ssize_t
859 acpi_show_profile(struct device *dev, struct device_attribute *attr,
860                   char *buf)
861 {
862         return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
863 }
864
865 static const struct device_attribute pm_profile_attr =
866         __ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL);
867
868 static ssize_t hotplug_enabled_show(struct kobject *kobj,
869                                     struct kobj_attribute *attr, char *buf)
870 {
871         struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
872
873         return sprintf(buf, "%d\n", hotplug->enabled);
874 }
875
876 static ssize_t hotplug_enabled_store(struct kobject *kobj,
877                                      struct kobj_attribute *attr,
878                                      const char *buf, size_t size)
879 {
880         struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
881         unsigned int val;
882
883         if (kstrtouint(buf, 10, &val) || val > 1)
884                 return -EINVAL;
885
886         acpi_scan_hotplug_enabled(hotplug, val);
887         return size;
888 }
889
890 static struct kobj_attribute hotplug_enabled_attr =
891         __ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show,
892                 hotplug_enabled_store);
893
894 static struct attribute *hotplug_profile_attrs[] = {
895         &hotplug_enabled_attr.attr,
896         NULL
897 };
898
899 static struct kobj_type acpi_hotplug_profile_ktype = {
900         .sysfs_ops = &kobj_sysfs_ops,
901         .default_attrs = hotplug_profile_attrs,
902 };
903
904 void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
905                                     const char *name)
906 {
907         int error;
908
909         if (!hotplug_kobj)
910                 goto err_out;
911
912         error = kobject_init_and_add(&hotplug->kobj,
913                 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
914         if (error)
915                 goto err_out;
916
917         kobject_uevent(&hotplug->kobj, KOBJ_ADD);
918         return;
919
920  err_out:
921         pr_err(PREFIX "Unable to add hotplug profile '%s'\n", name);
922 }
923
924 static ssize_t force_remove_show(struct kobject *kobj,
925                                  struct kobj_attribute *attr, char *buf)
926 {
927         return sprintf(buf, "%d\n", 0);
928 }
929
930 static ssize_t force_remove_store(struct kobject *kobj,
931                                   struct kobj_attribute *attr,
932                                   const char *buf, size_t size)
933 {
934         bool val;
935         int ret;
936
937         ret = strtobool(buf, &val);
938         if (ret < 0)
939                 return ret;
940
941         if (val) {
942                 pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n");
943                 return -EINVAL;
944         }
945         return size;
946 }
947
948 static const struct kobj_attribute force_remove_attr =
949         __ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show,
950                force_remove_store);
951
952 int __init acpi_sysfs_init(void)
953 {
954         int result;
955
956         result = acpi_tables_sysfs_init();
957         if (result)
958                 return result;
959
960         hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
961         if (!hotplug_kobj)
962                 return -ENOMEM;
963
964         result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
965         if (result)
966                 return result;
967
968         result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
969         return result;
970 }