Merge branch 'for-2.6.27' of git://git.marvell.com/mv643xx_eth into upstream-fixes
[linux-2.6] / drivers / acpi / system.c
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
35 ACPI_MODULE_NAME("system");
36 #ifdef MODULE_PARAM_PREFIX
37 #undef MODULE_PARAM_PREFIX
38 #endif
39 #define MODULE_PARAM_PREFIX "acpi."
40
41 #define ACPI_SYSTEM_CLASS               "system"
42 #define ACPI_SYSTEM_DEVICE_NAME         "System"
43
44 u32 acpi_irq_handled;
45
46 /*
47  * Make ACPICA version work as module param
48  */
49 static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
50 {
51         int result;
52
53         result = sprintf(buffer, "%x", ACPI_CA_VERSION);
54
55         return result;
56 }
57
58 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
59
60 /* --------------------------------------------------------------------------
61                               FS Interface (/sys)
62    -------------------------------------------------------------------------- */
63 static LIST_HEAD(acpi_table_attr_list);
64 static struct kobject *tables_kobj;
65
66 struct acpi_table_attr {
67         struct bin_attribute attr;
68         char name[8];
69         int instance;
70         struct list_head node;
71 };
72
73 static ssize_t acpi_table_show(struct kobject *kobj,
74                                struct bin_attribute *bin_attr, char *buf,
75                                loff_t offset, size_t count)
76 {
77         struct acpi_table_attr *table_attr =
78             container_of(bin_attr, struct acpi_table_attr, attr);
79         struct acpi_table_header *table_header = NULL;
80         acpi_status status;
81
82         status =
83             acpi_get_table(table_attr->name, table_attr->instance,
84                            &table_header);
85         if (ACPI_FAILURE(status))
86                 return -ENODEV;
87
88         return memory_read_from_buffer(buf, count, &offset,
89                                         table_header, table_header->length);
90 }
91
92 static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
93                                  struct acpi_table_header *table_header)
94 {
95         struct acpi_table_header *header = NULL;
96         struct acpi_table_attr *attr = NULL;
97
98         memcpy(table_attr->name, table_header->signature, ACPI_NAME_SIZE);
99
100         list_for_each_entry(attr, &acpi_table_attr_list, node) {
101                 if (!memcmp(table_header->signature, attr->name,
102                             ACPI_NAME_SIZE))
103                         if (table_attr->instance < attr->instance)
104                                 table_attr->instance = attr->instance;
105         }
106         table_attr->instance++;
107
108         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
109                                          !acpi_get_table(table_header->
110                                                          signature, 2,
111                                                          &header)))
112                 sprintf(table_attr->name + 4, "%d", table_attr->instance);
113
114         table_attr->attr.size = 0;
115         table_attr->attr.read = acpi_table_show;
116         table_attr->attr.attr.name = table_attr->name;
117         table_attr->attr.attr.mode = 0444;
118         table_attr->attr.attr.owner = THIS_MODULE;
119
120         return;
121 }
122
123 static int acpi_system_sysfs_init(void)
124 {
125         struct acpi_table_attr *table_attr;
126         struct acpi_table_header *table_header = NULL;
127         int table_index = 0;
128         int result;
129
130         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
131         if (!tables_kobj)
132                 return -ENOMEM;
133
134         do {
135                 result = acpi_get_table_by_index(table_index, &table_header);
136                 if (!result) {
137                         table_index++;
138                         table_attr = NULL;
139                         table_attr =
140                             kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
141                         if (!table_attr)
142                                 return -ENOMEM;
143
144                         acpi_table_attr_init(table_attr, table_header);
145                         result =
146                             sysfs_create_bin_file(tables_kobj,
147                                                   &table_attr->attr);
148                         if (result) {
149                                 kfree(table_attr);
150                                 return result;
151                         } else
152                                 list_add_tail(&table_attr->node,
153                                               &acpi_table_attr_list);
154                 }
155         } while (!result);
156         kobject_uevent(tables_kobj, KOBJ_ADD);
157
158         return 0;
159 }
160
161 /*
162  * Detailed ACPI IRQ counters in /sys/firmware/acpi/interrupts/
163  * See Documentation/ABI/testing/sysfs-firmware-acpi
164  */
165
166 #define COUNT_GPE 0
167 #define COUNT_SCI 1     /* acpi_irq_handled */
168 #define COUNT_ERROR 2   /* other */
169 #define NUM_COUNTERS_EXTRA 3
170
171 #define ACPI_EVENT_VALID        0x01
172 struct event_counter {
173         u32 count;
174         u32 flags;
175 };
176
177 static struct event_counter *all_counters;
178 static u32 num_gpes;
179 static u32 num_counters;
180 static struct attribute **all_attrs;
181 static u32 acpi_gpe_count;
182
183 static struct attribute_group interrupt_stats_attr_group = {
184         .name = "interrupts",
185 };
186 static struct kobj_attribute *counter_attrs;
187
188 static int count_num_gpes(void)
189 {
190         int count = 0;
191         struct acpi_gpe_xrupt_info *gpe_xrupt_info;
192         struct acpi_gpe_block_info *gpe_block;
193         acpi_cpu_flags flags;
194
195         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
196
197         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
198         while (gpe_xrupt_info) {
199                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
200                 while (gpe_block) {
201                         count += gpe_block->register_count *
202                             ACPI_GPE_REGISTER_WIDTH;
203                         gpe_block = gpe_block->next;
204                 }
205                 gpe_xrupt_info = gpe_xrupt_info->next;
206         }
207         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
208
209         return count;
210 }
211
212 static int get_gpe_device(int index, acpi_handle *handle)
213 {
214         struct acpi_gpe_xrupt_info *gpe_xrupt_info;
215         struct acpi_gpe_block_info *gpe_block;
216         acpi_cpu_flags flags;
217         struct acpi_namespace_node *node;
218
219         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
220
221         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
222         while (gpe_xrupt_info) {
223                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
224                 node = gpe_block->node;
225                 while (gpe_block) {
226                         index -= gpe_block->register_count *
227                             ACPI_GPE_REGISTER_WIDTH;
228                         if (index < 0) {
229                                 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
230                                 /* return NULL if it's FADT GPE */
231                                 if (node->type != ACPI_TYPE_DEVICE)
232                                         *handle = NULL;
233                                 else
234                                         *handle = node;
235                                 return 0;
236                         }
237                         node = gpe_block->node;
238                         gpe_block = gpe_block->next;
239                 }
240                 gpe_xrupt_info = gpe_xrupt_info->next;
241         }
242         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
243
244         return -ENODEV;
245 }
246
247 static void delete_gpe_attr_array(void)
248 {
249         struct event_counter *tmp = all_counters;
250
251         all_counters = NULL;
252         kfree(tmp);
253
254         if (counter_attrs) {
255                 int i;
256
257                 for (i = 0; i < num_gpes; i++)
258                         kfree(counter_attrs[i].attr.name);
259
260                 kfree(counter_attrs);
261         }
262         kfree(all_attrs);
263
264         return;
265 }
266
267 void acpi_os_gpe_count(u32 gpe_number)
268 {
269         acpi_gpe_count++;
270
271         if (!all_counters)
272                 return;
273
274         if (gpe_number < num_gpes)
275                 all_counters[gpe_number].count++;
276         else
277                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
278                                         count++;
279
280         return;
281 }
282
283 void acpi_os_fixed_event_count(u32 event_number)
284 {
285         if (!all_counters)
286                 return;
287
288         if (event_number < ACPI_NUM_FIXED_EVENTS)
289                 all_counters[num_gpes + event_number].count++;
290         else
291                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
292                                 count++;
293
294         return;
295 }
296
297 static int get_status(u32 index, acpi_event_status *status, acpi_handle *handle)
298 {
299         int result = 0;
300
301         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
302                 goto end;
303
304         if (index < num_gpes) {
305                 result = get_gpe_device(index, handle);
306                 if (result) {
307                         ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
308                                 "Invalid GPE 0x%x\n", index));
309                         goto end;
310                 }
311                 result = acpi_get_gpe_status(*handle, index,
312                                                 ACPI_NOT_ISR, status);
313         } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
314                 result = acpi_get_event_status(index - num_gpes, status);
315
316         /*
317          * sleep/power button GPE/Fixed Event is enabled after acpi_system_init,
318          * check the status at runtime and mark it as valid once it's enabled
319          */
320         if (!result && (*status & ACPI_EVENT_FLAG_ENABLED))
321                 all_counters[index].flags |= ACPI_EVENT_VALID;
322 end:
323         return result;
324 }
325
326 static ssize_t counter_show(struct kobject *kobj,
327         struct kobj_attribute *attr, char *buf)
328 {
329         int index = attr - counter_attrs;
330         int size;
331         acpi_handle handle;
332         acpi_event_status status;
333         int result = 0;
334
335         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
336                 acpi_irq_handled;
337         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
338                 acpi_gpe_count;
339
340         size = sprintf(buf, "%8d", all_counters[index].count);
341
342         /* "gpe_all" or "sci" */
343         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
344                 goto end;
345
346         result = get_status(index, &status, &handle);
347         if (result)
348                 goto end;
349
350         if (!(all_counters[index].flags & ACPI_EVENT_VALID))
351                 size += sprintf(buf + size, "  invalid");
352         else if (status & ACPI_EVENT_FLAG_ENABLED)
353                 size += sprintf(buf + size, "   enable");
354         else
355                 size += sprintf(buf + size, "  disable");
356
357 end:
358         size += sprintf(buf + size, "\n");
359         return result ? result : size;
360 }
361
362 /*
363  * counter_set() sets the specified counter.
364  * setting the total "sci" file to any value clears all counters.
365  * enable/disable/clear a gpe/fixed event in user space.
366  */
367 static ssize_t counter_set(struct kobject *kobj,
368         struct kobj_attribute *attr, const char *buf, size_t size)
369 {
370         int index = attr - counter_attrs;
371         acpi_event_status status;
372         acpi_handle handle;
373         int result = 0;
374
375         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
376                 int i;
377                 for (i = 0; i < num_counters; ++i)
378                         all_counters[i].count = 0;
379                 acpi_gpe_count = 0;
380                 acpi_irq_handled = 0;
381                 goto end;
382         }
383
384         /* show the event status for both GPEs and Fixed Events */
385         result = get_status(index, &status, &handle);
386         if (result)
387                 goto end;
388
389         if (!(all_counters[index].flags & ACPI_EVENT_VALID)) {
390                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
391                         "Can not change Invalid GPE/Fixed Event status\n"));
392                 return -EINVAL;
393         }
394
395         if (index < num_gpes) {
396                 if (!strcmp(buf, "disable\n") &&
397                                 (status & ACPI_EVENT_FLAG_ENABLED))
398                         result = acpi_disable_gpe(handle, index, ACPI_NOT_ISR);
399                 else if (!strcmp(buf, "enable\n") &&
400                                 !(status & ACPI_EVENT_FLAG_ENABLED))
401                         result = acpi_enable_gpe(handle, index, ACPI_NOT_ISR);
402                 else if (!strcmp(buf, "clear\n") &&
403                                 (status & ACPI_EVENT_FLAG_SET))
404                         result = acpi_clear_gpe(handle, index, ACPI_NOT_ISR);
405                 else
406                         all_counters[index].count = strtoul(buf, NULL, 0);
407         } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
408                 int event = index - num_gpes;
409                 if (!strcmp(buf, "disable\n") &&
410                                 (status & ACPI_EVENT_FLAG_ENABLED))
411                         result = acpi_disable_event(event, ACPI_NOT_ISR);
412                 else if (!strcmp(buf, "enable\n") &&
413                                 !(status & ACPI_EVENT_FLAG_ENABLED))
414                         result = acpi_enable_event(event, ACPI_NOT_ISR);
415                 else if (!strcmp(buf, "clear\n") &&
416                                 (status & ACPI_EVENT_FLAG_SET))
417                         result = acpi_clear_event(event);
418                 else
419                         all_counters[index].count = strtoul(buf, NULL, 0);
420         } else
421                 all_counters[index].count = strtoul(buf, NULL, 0);
422
423         if (ACPI_FAILURE(result))
424                 result = -EINVAL;
425 end:
426         return result ? result : size;
427 }
428
429 void acpi_irq_stats_init(void)
430 {
431         int i;
432
433         if (all_counters)
434                 return;
435
436         num_gpes = count_num_gpes();
437         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
438
439         all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
440                         GFP_KERNEL);
441         if (all_attrs == NULL)
442                 return;
443
444         all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
445                                 GFP_KERNEL);
446         if (all_counters == NULL)
447                 goto fail;
448
449         counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
450                         GFP_KERNEL);
451         if (counter_attrs == NULL)
452                 goto fail;
453
454         for (i = 0; i < num_counters; ++i) {
455                 char buffer[12];
456                 char *name;
457
458                 if (i < num_gpes)
459                         sprintf(buffer, "gpe%02X", i);
460                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
461                         sprintf(buffer, "ff_pmtimer");
462                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
463                         sprintf(buffer, "ff_gbl_lock");
464                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
465                         sprintf(buffer, "ff_pwr_btn");
466                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
467                         sprintf(buffer, "ff_slp_btn");
468                 else if (i == num_gpes + ACPI_EVENT_RTC)
469                         sprintf(buffer, "ff_rt_clk");
470                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
471                         sprintf(buffer, "gpe_all");
472                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
473                         sprintf(buffer, "sci");
474                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
475                         sprintf(buffer, "error");
476                 else
477                         sprintf(buffer, "bug%02X", i);
478
479                 name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
480                 if (name == NULL)
481                         goto fail;
482                 strncpy(name, buffer, strlen(buffer) + 1);
483
484                 counter_attrs[i].attr.name = name;
485                 counter_attrs[i].attr.mode = 0644;
486                 counter_attrs[i].show = counter_show;
487                 counter_attrs[i].store = counter_set;
488
489                 all_attrs[i] = &counter_attrs[i].attr;
490         }
491
492         interrupt_stats_attr_group.attrs = all_attrs;
493         if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
494                 return;
495
496 fail:
497         delete_gpe_attr_array();
498         return;
499 }
500
501 static void __exit interrupt_stats_exit(void)
502 {
503         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
504
505         delete_gpe_attr_array();
506
507         return;
508 }
509
510 /* --------------------------------------------------------------------------
511                               FS Interface (/proc)
512    -------------------------------------------------------------------------- */
513 #ifdef CONFIG_ACPI_PROCFS
514 #define ACPI_SYSTEM_FILE_INFO           "info"
515 #define ACPI_SYSTEM_FILE_EVENT          "event"
516 #define ACPI_SYSTEM_FILE_DSDT           "dsdt"
517 #define ACPI_SYSTEM_FILE_FADT           "fadt"
518
519 static int acpi_system_read_info(struct seq_file *seq, void *offset)
520 {
521
522         seq_printf(seq, "version:                 %x\n", ACPI_CA_VERSION);
523         return 0;
524 }
525
526 static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
527 {
528         return single_open(file, acpi_system_read_info, PDE(inode)->data);
529 }
530
531 static const struct file_operations acpi_system_info_ops = {
532         .owner = THIS_MODULE,
533         .open = acpi_system_info_open_fs,
534         .read = seq_read,
535         .llseek = seq_lseek,
536         .release = single_release,
537 };
538
539 static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
540                                      loff_t *);
541
542 static const struct file_operations acpi_system_dsdt_ops = {
543         .owner = THIS_MODULE,
544         .read = acpi_system_read_dsdt,
545 };
546
547 static ssize_t
548 acpi_system_read_dsdt(struct file *file,
549                       char __user * buffer, size_t count, loff_t * ppos)
550 {
551         acpi_status status = AE_OK;
552         struct acpi_table_header *dsdt = NULL;
553         ssize_t res;
554
555         status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
556         if (ACPI_FAILURE(status))
557                 return -ENODEV;
558
559         res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);
560
561         return res;
562 }
563
564 static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
565                                      loff_t *);
566
567 static const struct file_operations acpi_system_fadt_ops = {
568         .owner = THIS_MODULE,
569         .read = acpi_system_read_fadt,
570 };
571
572 static ssize_t
573 acpi_system_read_fadt(struct file *file,
574                       char __user * buffer, size_t count, loff_t * ppos)
575 {
576         acpi_status status = AE_OK;
577         struct acpi_table_header *fadt = NULL;
578         ssize_t res;
579
580         status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
581         if (ACPI_FAILURE(status))
582                 return -ENODEV;
583
584         res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);
585
586         return res;
587 }
588
589 static int acpi_system_procfs_init(void)
590 {
591         struct proc_dir_entry *entry;
592         int error = 0;
593
594         /* 'info' [R] */
595         entry = proc_create(ACPI_SYSTEM_FILE_INFO, S_IRUGO, acpi_root_dir,
596                             &acpi_system_info_ops);
597         if (!entry)
598                 goto Error;
599
600         /* 'dsdt' [R] */
601         entry = proc_create(ACPI_SYSTEM_FILE_DSDT, S_IRUSR, acpi_root_dir,
602                             &acpi_system_dsdt_ops);
603         if (!entry)
604                 goto Error;
605
606         /* 'fadt' [R] */
607         entry = proc_create(ACPI_SYSTEM_FILE_FADT, S_IRUSR, acpi_root_dir,
608                             &acpi_system_fadt_ops);
609         if (!entry)
610                 goto Error;
611
612       Done:
613         return error;
614
615       Error:
616         remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
617         remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
618         remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
619
620         error = -EFAULT;
621         goto Done;
622 }
623 #else
624 static int acpi_system_procfs_init(void)
625 {
626         return 0;
627 }
628 #endif
629
630 static int __init acpi_system_init(void)
631 {
632         int result = 0;
633
634         if (acpi_disabled)
635                 return 0;
636
637         result = acpi_system_procfs_init();
638         if (result)
639                 return result;
640
641         result = acpi_system_sysfs_init();
642
643         return result;
644 }
645
646 subsys_initcall(acpi_system_init);