Merge branch 'bjorn.button' into release
[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
37 #define ACPI_SYSTEM_CLASS               "system"
38 #define ACPI_SYSTEM_DEVICE_NAME         "System"
39
40 u32 acpi_irq_handled;
41 u32 acpi_irq_not_handled;
42
43 /*
44  * Make ACPICA version work as module param
45  */
46 static 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
55 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
56
57 /* --------------------------------------------------------------------------
58                               FS Interface (/sys)
59    -------------------------------------------------------------------------- */
60 static LIST_HEAD(acpi_table_attr_list);
61 static struct kobject *tables_kobj;
62 static struct kobject *dynamic_tables_kobj;
63
64 struct acpi_table_attr {
65         struct bin_attribute attr;
66         char name[8];
67         int instance;
68         struct list_head node;
69 };
70
71 static 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
96 static 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 = 0444;
125
126         return;
127 }
128
129 static acpi_status
130 acpi_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
163 static 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;
205 err_dynamic_tables:
206         kobject_put(tables_kobj);
207 err:
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
222 struct event_counter {
223         u32 count;
224         u32 flags;
225 };
226
227 static struct event_counter *all_counters;
228 static u32 num_gpes;
229 static u32 num_counters;
230 static struct attribute **all_attrs;
231 static u32 acpi_gpe_count;
232
233 static struct attribute_group interrupt_stats_attr_group = {
234         .name = "interrupts",
235 };
236 static struct kobj_attribute *counter_attrs;
237
238 static 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
258 void 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
274 void 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
288 static 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
307 end:
308         return result;
309 }
310
311 static 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
346 end:
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  */
356 static 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;
415 end:
416         return result ? result : size;
417 }
418
419 void 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
488 fail:
489         delete_gpe_attr_array();
490         return;
491 }
492
493 static 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
511 static 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
518 static 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
523 static 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
531 static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
532                                      loff_t *);
533
534 static const struct file_operations acpi_system_dsdt_ops = {
535         .owner = THIS_MODULE,
536         .read = acpi_system_read_dsdt,
537 };
538
539 static ssize_t
540 acpi_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
556 static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
557                                      loff_t *);
558
559 static const struct file_operations acpi_system_fadt_ops = {
560         .owner = THIS_MODULE,
561         .read = acpi_system_read_fadt,
562 };
563
564 static ssize_t
565 acpi_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
581 static 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
616 static int acpi_system_procfs_init(void)
617 {
618         return 0;
619 }
620 #endif
621
622 int __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 }