Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1/*
2 * acpi_system.c - ACPI System Driver ($Revision: 63 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or (at
12 * your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 */
25
26#include <linux/proc_fs.h>
27#include <linux/seq_file.h>
28#include <linux/init.h>
29#include <linux/string.h>
30#include <asm/uaccess.h>
31
32#include <acpi/acpi_drivers.h>
33
34#define _COMPONENT ACPI_SYSTEM_COMPONENT
35ACPI_MODULE_NAME("system");
36
37#define ACPI_SYSTEM_CLASS "system"
38#define ACPI_SYSTEM_DEVICE_NAME "System"
39
40u32 acpi_irq_handled;
41u32 acpi_irq_not_handled;
42
43/*
44 * Make ACPICA version work as module param
45 */
46static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
47{
48 int result;
49
50 result = sprintf(buffer, "%x", ACPI_CA_VERSION);
51
52 return result;
53}
54
55module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
56
57/* --------------------------------------------------------------------------
58 FS Interface (/sys)
59 -------------------------------------------------------------------------- */
60static LIST_HEAD(acpi_table_attr_list);
61static struct kobject *tables_kobj;
62static struct kobject *dynamic_tables_kobj;
63
64struct acpi_table_attr {
65 struct bin_attribute attr;
66 char name[8];
67 int instance;
68 struct list_head node;
69};
70
71static ssize_t acpi_table_show(struct kobject *kobj,
72 struct bin_attribute *bin_attr, char *buf,
73 loff_t offset, size_t count)
74{
75 struct acpi_table_attr *table_attr =
76 container_of(bin_attr, struct acpi_table_attr, attr);
77 struct acpi_table_header *table_header = NULL;
78 acpi_status status;
79 char name[ACPI_NAME_SIZE];
80
81 if (strncmp(table_attr->name, "NULL", 4))
82 memcpy(name, table_attr->name, ACPI_NAME_SIZE);
83 else
84 memcpy(name, "\0\0\0\0", 4);
85
86 status =
87 acpi_get_table(name, table_attr->instance,
88 &table_header);
89 if (ACPI_FAILURE(status))
90 return -ENODEV;
91
92 return memory_read_from_buffer(buf, count, &offset,
93 table_header, table_header->length);
94}
95
96static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
97 struct acpi_table_header *table_header)
98{
99 struct acpi_table_header *header = NULL;
100 struct acpi_table_attr *attr = NULL;
101
102 if (table_header->signature[0] != '\0')
103 memcpy(table_attr->name, table_header->signature,
104 ACPI_NAME_SIZE);
105 else
106 memcpy(table_attr->name, "NULL", 4);
107
108 list_for_each_entry(attr, &acpi_table_attr_list, node) {
109 if (!memcmp(table_attr->name, attr->name, ACPI_NAME_SIZE))
110 if (table_attr->instance < attr->instance)
111 table_attr->instance = attr->instance;
112 }
113 table_attr->instance++;
114
115 if (table_attr->instance > 1 || (table_attr->instance == 1 &&
116 !acpi_get_table
117 (table_header->signature, 2, &header)))
118 sprintf(table_attr->name + ACPI_NAME_SIZE, "%d",
119 table_attr->instance);
120
121 table_attr->attr.size = 0;
122 table_attr->attr.read = acpi_table_show;
123 table_attr->attr.attr.name = table_attr->name;
124 table_attr->attr.attr.mode = 0400;
125
126 return;
127}
128
129static acpi_status
130acpi_sysfs_table_handler(u32 event, void *table, void *context)
131{
132 struct acpi_table_attr *table_attr;
133
134 switch (event) {
135 case ACPI_TABLE_EVENT_LOAD:
136 table_attr =
137 kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
138 if (!table_attr)
139 return AE_NO_MEMORY;
140
141 acpi_table_attr_init(table_attr, table);
142 if (sysfs_create_bin_file(dynamic_tables_kobj,
143 &table_attr->attr)) {
144 kfree(table_attr);
145 return AE_ERROR;
146 } else
147 list_add_tail(&table_attr->node,
148 &acpi_table_attr_list);
149 break;
150 case ACPI_TABLE_EVENT_UNLOAD:
151 /*
152 * we do not need to do anything right now
153 * because the table is not deleted from the
154 * global table list when unloading it.
155 */
156 break;
157 default:
158 return AE_BAD_PARAMETER;
159 }
160 return AE_OK;
161}
162
163static int acpi_system_sysfs_init(void)
164{
165 struct acpi_table_attr *table_attr;
166 struct acpi_table_header *table_header = NULL;
167 int table_index = 0;
168 int result;
169
170 tables_kobj = kobject_create_and_add("tables", acpi_kobj);
171 if (!tables_kobj)
172 goto err;
173
174 dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
175 if (!dynamic_tables_kobj)
176 goto err_dynamic_tables;
177
178 do {
179 result = acpi_get_table_by_index(table_index, &table_header);
180 if (!result) {
181 table_index++;
182 table_attr = NULL;
183 table_attr =
184 kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
185 if (!table_attr)
186 return -ENOMEM;
187
188 acpi_table_attr_init(table_attr, table_header);
189 result =
190 sysfs_create_bin_file(tables_kobj,
191 &table_attr->attr);
192 if (result) {
193 kfree(table_attr);
194 return result;
195 } else
196 list_add_tail(&table_attr->node,
197 &acpi_table_attr_list);
198 }
199 } while (!result);
200 kobject_uevent(tables_kobj, KOBJ_ADD);
201 kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
202 result = acpi_install_table_handler(acpi_sysfs_table_handler, NULL);
203
204 return result == AE_OK ? 0 : -EINVAL;
205err_dynamic_tables:
206 kobject_put(tables_kobj);
207err:
208 return -ENOMEM;
209}
210
211/*
212 * Detailed ACPI IRQ counters in /sys/firmware/acpi/interrupts/
213 * See Documentation/ABI/testing/sysfs-firmware-acpi
214 */
215
216#define COUNT_GPE 0
217#define COUNT_SCI 1 /* acpi_irq_handled */
218#define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */
219#define COUNT_ERROR 3 /* other */
220#define NUM_COUNTERS_EXTRA 4
221
222struct event_counter {
223 u32 count;
224 u32 flags;
225};
226
227static struct event_counter *all_counters;
228static u32 num_gpes;
229static u32 num_counters;
230static struct attribute **all_attrs;
231static u32 acpi_gpe_count;
232
233static struct attribute_group interrupt_stats_attr_group = {
234 .name = "interrupts",
235};
236static struct kobj_attribute *counter_attrs;
237
238static void delete_gpe_attr_array(void)
239{
240 struct event_counter *tmp = all_counters;
241
242 all_counters = NULL;
243 kfree(tmp);
244
245 if (counter_attrs) {
246 int i;
247
248 for (i = 0; i < num_gpes; i++)
249 kfree(counter_attrs[i].attr.name);
250
251 kfree(counter_attrs);
252 }
253 kfree(all_attrs);
254
255 return;
256}
257
258void acpi_os_gpe_count(u32 gpe_number)
259{
260 acpi_gpe_count++;
261
262 if (!all_counters)
263 return;
264
265 if (gpe_number < num_gpes)
266 all_counters[gpe_number].count++;
267 else
268 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
269 count++;
270
271 return;
272}
273
274void acpi_os_fixed_event_count(u32 event_number)
275{
276 if (!all_counters)
277 return;
278
279 if (event_number < ACPI_NUM_FIXED_EVENTS)
280 all_counters[num_gpes + event_number].count++;
281 else
282 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
283 count++;
284
285 return;
286}
287
288static int get_status(u32 index, acpi_event_status *status, acpi_handle *handle)
289{
290 int result = 0;
291
292 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
293 goto end;
294
295 if (index < num_gpes) {
296 result = acpi_get_gpe_device(index, handle);
297 if (result) {
298 ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
299 "Invalid GPE 0x%x\n", index));
300 goto end;
301 }
302 result = acpi_get_gpe_status(*handle, index,
303 ACPI_NOT_ISR, status);
304 } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
305 result = acpi_get_event_status(index - num_gpes, status);
306
307end:
308 return result;
309}
310
311static ssize_t counter_show(struct kobject *kobj,
312 struct kobj_attribute *attr, char *buf)
313{
314 int index = attr - counter_attrs;
315 int size;
316 acpi_handle handle;
317 acpi_event_status status;
318 int result = 0;
319
320 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
321 acpi_irq_handled;
322 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
323 acpi_irq_not_handled;
324 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
325 acpi_gpe_count;
326
327 size = sprintf(buf, "%8d", all_counters[index].count);
328
329 /* "gpe_all" or "sci" */
330 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
331 goto end;
332
333 result = get_status(index, &status, &handle);
334 if (result)
335 goto end;
336
337 if (!(status & ACPI_EVENT_FLAG_HANDLE))
338 size += sprintf(buf + size, " invalid");
339 else if (status & ACPI_EVENT_FLAG_ENABLED)
340 size += sprintf(buf + size, " enabled");
341 else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
342 size += sprintf(buf + size, " wake_enabled");
343 else
344 size += sprintf(buf + size, " disabled");
345
346end:
347 size += sprintf(buf + size, "\n");
348 return result ? result : size;
349}
350
351/*
352 * counter_set() sets the specified counter.
353 * setting the total "sci" file to any value clears all counters.
354 * enable/disable/clear a gpe/fixed event in user space.
355 */
356static ssize_t counter_set(struct kobject *kobj,
357 struct kobj_attribute *attr, const char *buf, size_t size)
358{
359 int index = attr - counter_attrs;
360 acpi_event_status status;
361 acpi_handle handle;
362 int result = 0;
363
364 if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
365 int i;
366 for (i = 0; i < num_counters; ++i)
367 all_counters[i].count = 0;
368 acpi_gpe_count = 0;
369 acpi_irq_handled = 0;
370 acpi_irq_not_handled = 0;
371 goto end;
372 }
373
374 /* show the event status for both GPEs and Fixed Events */
375 result = get_status(index, &status, &handle);
376 if (result)
377 goto end;
378
379 if (!(status & ACPI_EVENT_FLAG_HANDLE)) {
380 printk(KERN_WARNING PREFIX
381 "Can not change Invalid GPE/Fixed Event status\n");
382 return -EINVAL;
383 }
384
385 if (index < num_gpes) {
386 if (!strcmp(buf, "disable\n") &&
387 (status & ACPI_EVENT_FLAG_ENABLED))
388 result = acpi_disable_gpe(handle, index);
389 else if (!strcmp(buf, "enable\n") &&
390 !(status & ACPI_EVENT_FLAG_ENABLED))
391 result = acpi_enable_gpe(handle, index);
392 else if (!strcmp(buf, "clear\n") &&
393 (status & ACPI_EVENT_FLAG_SET))
394 result = acpi_clear_gpe(handle, index, ACPI_NOT_ISR);
395 else
396 all_counters[index].count = strtoul(buf, NULL, 0);
397 } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
398 int event = index - num_gpes;
399 if (!strcmp(buf, "disable\n") &&
400 (status & ACPI_EVENT_FLAG_ENABLED))
401 result = acpi_disable_event(event, ACPI_NOT_ISR);
402 else if (!strcmp(buf, "enable\n") &&
403 !(status & ACPI_EVENT_FLAG_ENABLED))
404 result = acpi_enable_event(event, ACPI_NOT_ISR);
405 else if (!strcmp(buf, "clear\n") &&
406 (status & ACPI_EVENT_FLAG_SET))
407 result = acpi_clear_event(event);
408 else
409 all_counters[index].count = strtoul(buf, NULL, 0);
410 } else
411 all_counters[index].count = strtoul(buf, NULL, 0);
412
413 if (ACPI_FAILURE(result))
414 result = -EINVAL;
415end:
416 return result ? result : size;
417}
418
419void acpi_irq_stats_init(void)
420{
421 int i;
422
423 if (all_counters)
424 return;
425
426 num_gpes = acpi_current_gpe_count;
427 num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
428
429 all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
430 GFP_KERNEL);
431 if (all_attrs == NULL)
432 return;
433
434 all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
435 GFP_KERNEL);
436 if (all_counters == NULL)
437 goto fail;
438
439 counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
440 GFP_KERNEL);
441 if (counter_attrs == NULL)
442 goto fail;
443
444 for (i = 0; i < num_counters; ++i) {
445 char buffer[12];
446 char *name;
447
448 if (i < num_gpes)
449 sprintf(buffer, "gpe%02X", i);
450 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
451 sprintf(buffer, "ff_pmtimer");
452 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
453 sprintf(buffer, "ff_gbl_lock");
454 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
455 sprintf(buffer, "ff_pwr_btn");
456 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
457 sprintf(buffer, "ff_slp_btn");
458 else if (i == num_gpes + ACPI_EVENT_RTC)
459 sprintf(buffer, "ff_rt_clk");
460 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
461 sprintf(buffer, "gpe_all");
462 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
463 sprintf(buffer, "sci");
464 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
465 sprintf(buffer, "sci_not");
466 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
467 sprintf(buffer, "error");
468 else
469 sprintf(buffer, "bug%02X", i);
470
471 name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
472 if (name == NULL)
473 goto fail;
474 strncpy(name, buffer, strlen(buffer) + 1);
475
476 counter_attrs[i].attr.name = name;
477 counter_attrs[i].attr.mode = 0644;
478 counter_attrs[i].show = counter_show;
479 counter_attrs[i].store = counter_set;
480
481 all_attrs[i] = &counter_attrs[i].attr;
482 }
483
484 interrupt_stats_attr_group.attrs = all_attrs;
485 if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
486 return;
487
488fail:
489 delete_gpe_attr_array();
490 return;
491}
492
493static void __exit interrupt_stats_exit(void)
494{
495 sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
496
497 delete_gpe_attr_array();
498
499 return;
500}
501
502/* --------------------------------------------------------------------------
503 FS Interface (/proc)
504 -------------------------------------------------------------------------- */
505#ifdef CONFIG_ACPI_PROCFS
506#define ACPI_SYSTEM_FILE_INFO "info"
507#define ACPI_SYSTEM_FILE_EVENT "event"
508#define ACPI_SYSTEM_FILE_DSDT "dsdt"
509#define ACPI_SYSTEM_FILE_FADT "fadt"
510
511static int acpi_system_read_info(struct seq_file *seq, void *offset)
512{
513
514 seq_printf(seq, "version: %x\n", ACPI_CA_VERSION);
515 return 0;
516}
517
518static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
519{
520 return single_open(file, acpi_system_read_info, PDE(inode)->data);
521}
522
523static const struct file_operations acpi_system_info_ops = {
524 .owner = THIS_MODULE,
525 .open = acpi_system_info_open_fs,
526 .read = seq_read,
527 .llseek = seq_lseek,
528 .release = single_release,
529};
530
531static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
532 loff_t *);
533
534static const struct file_operations acpi_system_dsdt_ops = {
535 .owner = THIS_MODULE,
536 .read = acpi_system_read_dsdt,
537};
538
539static ssize_t
540acpi_system_read_dsdt(struct file *file,
541 char __user * buffer, size_t count, loff_t * ppos)
542{
543 acpi_status status = AE_OK;
544 struct acpi_table_header *dsdt = NULL;
545 ssize_t res;
546
547 status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
548 if (ACPI_FAILURE(status))
549 return -ENODEV;
550
551 res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);
552
553 return res;
554}
555
556static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
557 loff_t *);
558
559static const struct file_operations acpi_system_fadt_ops = {
560 .owner = THIS_MODULE,
561 .read = acpi_system_read_fadt,
562};
563
564static ssize_t
565acpi_system_read_fadt(struct file *file,
566 char __user * buffer, size_t count, loff_t * ppos)
567{
568 acpi_status status = AE_OK;
569 struct acpi_table_header *fadt = NULL;
570 ssize_t res;
571
572 status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
573 if (ACPI_FAILURE(status))
574 return -ENODEV;
575
576 res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);
577
578 return res;
579}
580
581static int acpi_system_procfs_init(void)
582{
583 struct proc_dir_entry *entry;
584 int error = 0;
585
586 /* 'info' [R] */
587 entry = proc_create(ACPI_SYSTEM_FILE_INFO, S_IRUGO, acpi_root_dir,
588 &acpi_system_info_ops);
589 if (!entry)
590 goto Error;
591
592 /* 'dsdt' [R] */
593 entry = proc_create(ACPI_SYSTEM_FILE_DSDT, S_IRUSR, acpi_root_dir,
594 &acpi_system_dsdt_ops);
595 if (!entry)
596 goto Error;
597
598 /* 'fadt' [R] */
599 entry = proc_create(ACPI_SYSTEM_FILE_FADT, S_IRUSR, acpi_root_dir,
600 &acpi_system_fadt_ops);
601 if (!entry)
602 goto Error;
603
604 Done:
605 return error;
606
607 Error:
608 remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
609 remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
610 remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
611
612 error = -EFAULT;
613 goto Done;
614}
615#else
616static int acpi_system_procfs_init(void)
617{
618 return 0;
619}
620#endif
621
622int __init acpi_system_init(void)
623{
624 int result;
625
626 result = acpi_system_procfs_init();
627 if (result)
628 return result;
629
630 result = acpi_system_sysfs_init();
631
632 return result;
633}