Merge branch 'bugzilla-11539' into release
[linux-2.6.git] / 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         char name[ACPI_NAME_SIZE];
82
83         if (strncmp(table_attr->name, "NULL", 4))
84                 memcpy(name, table_attr->name, ACPI_NAME_SIZE);
85         else
86                 memcpy(name, "\0\0\0\0", 4);
87
88         status =
89             acpi_get_table(name, table_attr->instance,
90                            &table_header);
91         if (ACPI_FAILURE(status))
92                 return -ENODEV;
93
94         return memory_read_from_buffer(buf, count, &offset,
95                                         table_header, table_header->length);
96 }
97
98 static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
99                                  struct acpi_table_header *table_header)
100 {
101         struct acpi_table_header *header = NULL;
102         struct acpi_table_attr *attr = NULL;
103
104         if (table_header->signature[0] != '\0')
105                 memcpy(table_attr->name, table_header->signature,
106                         ACPI_NAME_SIZE);
107         else
108                 memcpy(table_attr->name, "NULL", 4);
109
110         list_for_each_entry(attr, &acpi_table_attr_list, node) {
111                 if (!memcmp(table_attr->name, attr->name, ACPI_NAME_SIZE))
112                         if (table_attr->instance < attr->instance)
113                                 table_attr->instance = attr->instance;
114         }
115         table_attr->instance++;
116
117         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
118                                         !acpi_get_table
119                                         (table_header->signature, 2, &header)))
120                 sprintf(table_attr->name + ACPI_NAME_SIZE, "%d",
121                         table_attr->instance);
122
123         table_attr->attr.size = 0;
124         table_attr->attr.read = acpi_table_show;
125         table_attr->attr.attr.name = table_attr->name;
126         table_attr->attr.attr.mode = 0444;
127
128         return;
129 }
130
131 static int acpi_system_sysfs_init(void)
132 {
133         struct acpi_table_attr *table_attr;
134         struct acpi_table_header *table_header = NULL;
135         int table_index = 0;
136         int result;
137
138         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
139         if (!tables_kobj)
140                 return -ENOMEM;
141
142         do {
143                 result = acpi_get_table_by_index(table_index, &table_header);
144                 if (!result) {
145                         table_index++;
146                         table_attr = NULL;
147                         table_attr =
148                             kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
149                         if (!table_attr)
150                                 return -ENOMEM;
151
152                         acpi_table_attr_init(table_attr, table_header);
153                         result =
154                             sysfs_create_bin_file(tables_kobj,
155                                                   &table_attr->attr);
156                         if (result) {
157                                 kfree(table_attr);
158                                 return result;
159                         } else
160                                 list_add_tail(&table_attr->node,
161                                               &acpi_table_attr_list);
162                 }
163         } while (!result);
164         kobject_uevent(tables_kobj, KOBJ_ADD);
165
166         return 0;
167 }
168
169 /*
170  * Detailed ACPI IRQ counters in /sys/firmware/acpi/interrupts/
171  * See Documentation/ABI/testing/sysfs-firmware-acpi
172  */
173
174 #define COUNT_GPE 0
175 #define COUNT_SCI 1     /* acpi_irq_handled */
176 #define COUNT_ERROR 2   /* other */
177 #define NUM_COUNTERS_EXTRA 3
178
179 struct event_counter {
180         u32 count;
181         u32 flags;
182 };
183
184 static struct event_counter *all_counters;
185 static u32 num_gpes;
186 static u32 num_counters;
187 static struct attribute **all_attrs;
188 static u32 acpi_gpe_count;
189
190 static struct attribute_group interrupt_stats_attr_group = {
191         .name = "interrupts",
192 };
193 static struct kobj_attribute *counter_attrs;
194
195 static int count_num_gpes(void)
196 {
197         int count = 0;
198         struct acpi_gpe_xrupt_info *gpe_xrupt_info;
199         struct acpi_gpe_block_info *gpe_block;
200         acpi_cpu_flags flags;
201
202         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
203
204         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
205         while (gpe_xrupt_info) {
206                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
207                 while (gpe_block) {
208                         count += gpe_block->register_count *
209                             ACPI_GPE_REGISTER_WIDTH;
210                         gpe_block = gpe_block->next;
211                 }
212                 gpe_xrupt_info = gpe_xrupt_info->next;
213         }
214         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
215
216         return count;
217 }
218
219 static int get_gpe_device(int index, acpi_handle *handle)
220 {
221         struct acpi_gpe_xrupt_info *gpe_xrupt_info;
222         struct acpi_gpe_block_info *gpe_block;
223         acpi_cpu_flags flags;
224         struct acpi_namespace_node *node;
225
226         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
227
228         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
229         while (gpe_xrupt_info) {
230                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
231                 node = gpe_block->node;
232                 while (gpe_block) {
233                         index -= gpe_block->register_count *
234                             ACPI_GPE_REGISTER_WIDTH;
235                         if (index < 0) {
236                                 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
237                                 /* return NULL if it's FADT GPE */
238                                 if (node->type != ACPI_TYPE_DEVICE)
239                                         *handle = NULL;
240                                 else
241                                         *handle = node;
242                                 return 0;
243                         }
244                         node = gpe_block->node;
245                         gpe_block = gpe_block->next;
246                 }
247                 gpe_xrupt_info = gpe_xrupt_info->next;
248         }
249         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
250
251         return -ENODEV;
252 }
253
254 static void delete_gpe_attr_array(void)
255 {
256         struct event_counter *tmp = all_counters;
257
258         all_counters = NULL;
259         kfree(tmp);
260
261         if (counter_attrs) {
262                 int i;
263
264                 for (i = 0; i < num_gpes; i++)
265                         kfree(counter_attrs[i].attr.name);
266
267                 kfree(counter_attrs);
268         }
269         kfree(all_attrs);
270
271         return;
272 }
273
274 void acpi_os_gpe_count(u32 gpe_number)
275 {
276         acpi_gpe_count++;
277
278         if (!all_counters)
279                 return;
280
281         if (gpe_number < num_gpes)
282                 all_counters[gpe_number].count++;
283         else
284                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
285                                         count++;
286
287         return;
288 }
289
290 void acpi_os_fixed_event_count(u32 event_number)
291 {
292         if (!all_counters)
293                 return;
294
295         if (event_number < ACPI_NUM_FIXED_EVENTS)
296                 all_counters[num_gpes + event_number].count++;
297         else
298                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
299                                 count++;
300
301         return;
302 }
303
304 static int get_status(u32 index, acpi_event_status *status, acpi_handle *handle)
305 {
306         int result = 0;
307
308         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
309                 goto end;
310
311         if (index < num_gpes) {
312                 result = get_gpe_device(index, handle);
313                 if (result) {
314                         ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
315                                 "Invalid GPE 0x%x\n", index));
316                         goto end;
317                 }
318                 result = acpi_get_gpe_status(*handle, index,
319                                                 ACPI_NOT_ISR, status);
320         } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
321                 result = acpi_get_event_status(index - num_gpes, status);
322
323 end:
324         return result;
325 }
326
327 static ssize_t counter_show(struct kobject *kobj,
328         struct kobj_attribute *attr, char *buf)
329 {
330         int index = attr - counter_attrs;
331         int size;
332         acpi_handle handle;
333         acpi_event_status status;
334         int result = 0;
335
336         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
337                 acpi_irq_handled;
338         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
339                 acpi_gpe_count;
340
341         size = sprintf(buf, "%8d", all_counters[index].count);
342
343         /* "gpe_all" or "sci" */
344         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
345                 goto end;
346
347         result = get_status(index, &status, &handle);
348         if (result)
349                 goto end;
350
351         if (!(status & ACPI_EVENT_FLAG_HANDLE))
352                 size += sprintf(buf + size, "   invalid");
353         else if (status & ACPI_EVENT_FLAG_ENABLED)
354                 size += sprintf(buf + size, "   enabled");
355         else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
356                 size += sprintf(buf + size, "   wake_enabled");
357         else
358                 size += sprintf(buf + size, "   disabled");
359
360 end:
361         size += sprintf(buf + size, "\n");
362         return result ? result : size;
363 }
364
365 /*
366  * counter_set() sets the specified counter.
367  * setting the total "sci" file to any value clears all counters.
368  * enable/disable/clear a gpe/fixed event in user space.
369  */
370 static ssize_t counter_set(struct kobject *kobj,
371         struct kobj_attribute *attr, const char *buf, size_t size)
372 {
373         int index = attr - counter_attrs;
374         acpi_event_status status;
375         acpi_handle handle;
376         int result = 0;
377
378         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
379                 int i;
380                 for (i = 0; i < num_counters; ++i)
381                         all_counters[i].count = 0;
382                 acpi_gpe_count = 0;
383                 acpi_irq_handled = 0;
384                 goto end;
385         }
386
387         /* show the event status for both GPEs and Fixed Events */
388         result = get_status(index, &status, &handle);
389         if (result)
390                 goto end;
391
392         if (!(status & ACPI_EVENT_FLAG_HANDLE)) {
393                 printk(KERN_WARNING PREFIX
394                         "Can not change Invalid GPE/Fixed Event status\n");
395                 return -EINVAL;
396         }
397
398         if (index < num_gpes) {
399                 if (!strcmp(buf, "disable\n") &&
400                                 (status & ACPI_EVENT_FLAG_ENABLED))
401                         result = acpi_disable_gpe(handle, index, ACPI_NOT_ISR);
402                 else if (!strcmp(buf, "enable\n") &&
403                                 !(status & ACPI_EVENT_FLAG_ENABLED))
404                         result = acpi_enable_gpe(handle, index, ACPI_NOT_ISR);
405                 else if (!strcmp(buf, "clear\n") &&
406                                 (status & ACPI_EVENT_FLAG_SET))
407                         result = acpi_clear_gpe(handle, index, ACPI_NOT_ISR);
408                 else
409                         all_counters[index].count = strtoul(buf, NULL, 0);
410         } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
411                 int event = index - num_gpes;
412                 if (!strcmp(buf, "disable\n") &&
413                                 (status & ACPI_EVENT_FLAG_ENABLED))
414                         result = acpi_disable_event(event, ACPI_NOT_ISR);
415                 else if (!strcmp(buf, "enable\n") &&
416                                 !(status & ACPI_EVENT_FLAG_ENABLED))
417                         result = acpi_enable_event(event, ACPI_NOT_ISR);
418                 else if (!strcmp(buf, "clear\n") &&
419                                 (status & ACPI_EVENT_FLAG_SET))
420                         result = acpi_clear_event(event);
421                 else
422                         all_counters[index].count = strtoul(buf, NULL, 0);
423         } else
424                 all_counters[index].count = strtoul(buf, NULL, 0);
425
426         if (ACPI_FAILURE(result))
427                 result = -EINVAL;
428 end:
429         return result ? result : size;
430 }
431
432 void acpi_irq_stats_init(void)
433 {
434         int i;
435
436         if (all_counters)
437                 return;
438
439         num_gpes = count_num_gpes();
440         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
441
442         all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
443                         GFP_KERNEL);
444         if (all_attrs == NULL)
445                 return;
446
447         all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
448                                 GFP_KERNEL);
449         if (all_counters == NULL)
450                 goto fail;
451
452         counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
453                         GFP_KERNEL);
454         if (counter_attrs == NULL)
455                 goto fail;
456
457         for (i = 0; i < num_counters; ++i) {
458                 char buffer[12];
459                 char *name;
460
461                 if (i < num_gpes)
462                         sprintf(buffer, "gpe%02X", i);
463                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
464                         sprintf(buffer, "ff_pmtimer");
465                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
466                         sprintf(buffer, "ff_gbl_lock");
467                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
468                         sprintf(buffer, "ff_pwr_btn");
469                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
470                         sprintf(buffer, "ff_slp_btn");
471                 else if (i == num_gpes + ACPI_EVENT_RTC)
472                         sprintf(buffer, "ff_rt_clk");
473                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
474                         sprintf(buffer, "gpe_all");
475                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
476                         sprintf(buffer, "sci");
477                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
478                         sprintf(buffer, "error");
479                 else
480                         sprintf(buffer, "bug%02X", i);
481
482                 name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
483                 if (name == NULL)
484                         goto fail;
485                 strncpy(name, buffer, strlen(buffer) + 1);
486
487                 counter_attrs[i].attr.name = name;
488                 counter_attrs[i].attr.mode = 0644;
489                 counter_attrs[i].show = counter_show;
490                 counter_attrs[i].store = counter_set;
491
492                 all_attrs[i] = &counter_attrs[i].attr;
493         }
494
495         interrupt_stats_attr_group.attrs = all_attrs;
496         if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
497                 return;
498
499 fail:
500         delete_gpe_attr_array();
501         return;
502 }
503
504 static void __exit interrupt_stats_exit(void)
505 {
506         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
507
508         delete_gpe_attr_array();
509
510         return;
511 }
512
513 /* --------------------------------------------------------------------------
514                               FS Interface (/proc)
515    -------------------------------------------------------------------------- */
516 #ifdef CONFIG_ACPI_PROCFS
517 #define ACPI_SYSTEM_FILE_INFO           "info"
518 #define ACPI_SYSTEM_FILE_EVENT          "event"
519 #define ACPI_SYSTEM_FILE_DSDT           "dsdt"
520 #define ACPI_SYSTEM_FILE_FADT           "fadt"
521
522 static int acpi_system_read_info(struct seq_file *seq, void *offset)
523 {
524
525         seq_printf(seq, "version:                 %x\n", ACPI_CA_VERSION);
526         return 0;
527 }
528
529 static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
530 {
531         return single_open(file, acpi_system_read_info, PDE(inode)->data);
532 }
533
534 static const struct file_operations acpi_system_info_ops = {
535         .owner = THIS_MODULE,
536         .open = acpi_system_info_open_fs,
537         .read = seq_read,
538         .llseek = seq_lseek,
539         .release = single_release,
540 };
541
542 static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
543                                      loff_t *);
544
545 static const struct file_operations acpi_system_dsdt_ops = {
546         .owner = THIS_MODULE,
547         .read = acpi_system_read_dsdt,
548 };
549
550 static ssize_t
551 acpi_system_read_dsdt(struct file *file,
552                       char __user * buffer, size_t count, loff_t * ppos)
553 {
554         acpi_status status = AE_OK;
555         struct acpi_table_header *dsdt = NULL;
556         ssize_t res;
557
558         status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
559         if (ACPI_FAILURE(status))
560                 return -ENODEV;
561
562         res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);
563
564         return res;
565 }
566
567 static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
568                                      loff_t *);
569
570 static const struct file_operations acpi_system_fadt_ops = {
571         .owner = THIS_MODULE,
572         .read = acpi_system_read_fadt,
573 };
574
575 static ssize_t
576 acpi_system_read_fadt(struct file *file,
577                       char __user * buffer, size_t count, loff_t * ppos)
578 {
579         acpi_status status = AE_OK;
580         struct acpi_table_header *fadt = NULL;
581         ssize_t res;
582
583         status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
584         if (ACPI_FAILURE(status))
585                 return -ENODEV;
586
587         res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);
588
589         return res;
590 }
591
592 static int acpi_system_procfs_init(void)
593 {
594         struct proc_dir_entry *entry;
595         int error = 0;
596
597         /* 'info' [R] */
598         entry = proc_create(ACPI_SYSTEM_FILE_INFO, S_IRUGO, acpi_root_dir,
599                             &acpi_system_info_ops);
600         if (!entry)
601                 goto Error;
602
603         /* 'dsdt' [R] */
604         entry = proc_create(ACPI_SYSTEM_FILE_DSDT, S_IRUSR, acpi_root_dir,
605                             &acpi_system_dsdt_ops);
606         if (!entry)
607                 goto Error;
608
609         /* 'fadt' [R] */
610         entry = proc_create(ACPI_SYSTEM_FILE_FADT, S_IRUSR, acpi_root_dir,
611                             &acpi_system_fadt_ops);
612         if (!entry)
613                 goto Error;
614
615       Done:
616         return error;
617
618       Error:
619         remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
620         remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
621         remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
622
623         error = -EFAULT;
624         goto Done;
625 }
626 #else
627 static int acpi_system_procfs_init(void)
628 {
629         return 0;
630 }
631 #endif
632
633 static int __init acpi_system_init(void)
634 {
635         int result = 0;
636
637         if (acpi_disabled)
638                 return 0;
639
640         result = acpi_system_procfs_init();
641         if (result)
642                 return result;
643
644         result = acpi_system_sysfs_init();
645
646         return result;
647 }
648
649 subsys_initcall(acpi_system_init);