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 PREFIX "ACPI: "
  35
  36 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  37 ACPI_MODULE_NAME("system");
  38
  39 #define ACPI_SYSTEM_CLASS               "system"
  40 #define ACPI_SYSTEM_DEVICE_NAME         "System"
  41
  42 u32 acpi_irq_handled;
  43 u32 acpi_irq_not_handled;
  44
  45 /*
  46  * Make ACPICA version work as module param
  47  */
  48 static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
  49 {
  50         int result;
  51
  52         result = sprintf(buffer, "%x", ACPI_CA_VERSION);
  53
  54         return result;
  55 }
  56
  57 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
  58
  59 /* --------------------------------------------------------------------------
  60                               FS Interface (/sys)
  61    -------------------------------------------------------------------------- */
  62 static LIST_HEAD(acpi_table_attr_list);
  63 static struct kobject *tables_kobj;
  64 static struct kobject *dynamic_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         sysfs_attr_init(&table_attr->attr.attr);
 105         if (table_header->signature[0] != '\0')
 106                 memcpy(table_attr->name, table_header->signature,
 107                         ACPI_NAME_SIZE);
 108         else
 109                 memcpy(table_attr->name, "NULL", 4);
 110
 111         list_for_each_entry(attr, &acpi_table_attr_list, node) {
 112                 if (!memcmp(table_attr->name, attr->name, ACPI_NAME_SIZE))
 113                         if (table_attr->instance < attr->instance)
 114                                 table_attr->instance = attr->instance;
 115         }
 116         table_attr->instance++;
 117
 118         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
 119                                         !acpi_get_table
 120                                         (table_header->signature, 2, &header)))
 121                 sprintf(table_attr->name + ACPI_NAME_SIZE, "%d",
 122                         table_attr->instance);
 123
 124         table_attr->attr.size = 0;
 125         table_attr->attr.read = acpi_table_show;
 126         table_attr->attr.attr.name = table_attr->name;
 127         table_attr->attr.attr.mode = 0400;
 128
 129         return;
 130 }
 131
 132 static acpi_status
 133 acpi_sysfs_table_handler(u32 event, void *table, void *context)
 134 {
 135         struct acpi_table_attr *table_attr;
 136
 137         switch (event) {
 138         case ACPI_TABLE_EVENT_LOAD:
 139                 table_attr =
 140                         kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
 141                 if (!table_attr)
 142                         return AE_NO_MEMORY;
 143
 144                 acpi_table_attr_init(table_attr, table);
 145                 if (sysfs_create_bin_file(dynamic_tables_kobj,
 146                                         &table_attr->attr)) {
 147                         kfree(table_attr);
 148                         return AE_ERROR;
 149                 } else
 150                         list_add_tail(&table_attr->node,
 151                                         &acpi_table_attr_list);
 152                 break;
 153         case ACPI_TABLE_EVENT_UNLOAD:
 154                 /*
 155                  * we do not need to do anything right now
 156                  * because the table is not deleted from the
 157                  * global table list when unloading it.
 158                  */
 159                 break;
 160         default:
 161                 return AE_BAD_PARAMETER;
 162         }
 163         return AE_OK;
 164 }
 165
 166 static int acpi_system_sysfs_init(void)
 167 {
 168         struct acpi_table_attr *table_attr;
 169         struct acpi_table_header *table_header = NULL;
 170         int table_index = 0;
 171         int result;
 172
 173         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
 174         if (!tables_kobj)
 175                 goto err;
 176
 177         dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
 178         if (!dynamic_tables_kobj)
 179                 goto err_dynamic_tables;
 180
 181         do {
 182                 result = acpi_get_table_by_index(table_index, &table_header);
 183                 if (!result) {
 184                         table_index++;
 185                         table_attr = NULL;
 186                         table_attr =
 187                             kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
 188                         if (!table_attr)
 189                                 return -ENOMEM;
 190
 191                         acpi_table_attr_init(table_attr, table_header);
 192                         result =
 193                             sysfs_create_bin_file(tables_kobj,
 194                                                   &table_attr->attr);
 195                         if (result) {
 196                                 kfree(table_attr);
 197                                 return result;
 198                         } else
 199                                 list_add_tail(&table_attr->node,
 200                                               &acpi_table_attr_list);
 201                 }
 202         } while (!result);
 203         kobject_uevent(tables_kobj, KOBJ_ADD);
 204         kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
 205         result = acpi_install_table_handler(acpi_sysfs_table_handler, NULL);
 206
 207         return result == AE_OK ? 0 : -EINVAL;
 208 err_dynamic_tables:
 209         kobject_put(tables_kobj);
 210 err:
 211         return -ENOMEM;
 212 }
 213
 214 /*
 215  * Detailed ACPI IRQ counters in /sys/firmware/acpi/interrupts/
 216  * See Documentation/ABI/testing/sysfs-firmware-acpi
 217  */
 218
 219 #define COUNT_GPE 0
 220 #define COUNT_SCI 1     /* acpi_irq_handled */
 221 #define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */
 222 #define COUNT_ERROR 3   /* other */
 223 #define NUM_COUNTERS_EXTRA 4
 224
 225 struct event_counter {
 226         u32 count;
 227         u32 flags;
 228 };
 229
 230 static struct event_counter *all_counters;
 231 static u32 num_gpes;
 232 static u32 num_counters;
 233 static struct attribute **all_attrs;
 234 static u32 acpi_gpe_count;
 235
 236 static struct attribute_group interrupt_stats_attr_group = {
 237         .name = "interrupts",
 238 };
 239 static struct kobj_attribute *counter_attrs;
 240
 241 static void delete_gpe_attr_array(void)
 242 {
 243         struct event_counter *tmp = all_counters;
 244
 245         all_counters = NULL;
 246         kfree(tmp);
 247
 248         if (counter_attrs) {
 249                 int i;
 250
 251                 for (i = 0; i < num_gpes; i++)
 252                         kfree(counter_attrs[i].attr.name);
 253
 254                 kfree(counter_attrs);
 255         }
 256         kfree(all_attrs);
 257
 258         return;
 259 }
 260
 261 void acpi_os_gpe_count(u32 gpe_number)
 262 {
 263         acpi_gpe_count++;
 264
 265         if (!all_counters)
 266                 return;
 267
 268         if (gpe_number < num_gpes)
 269                 all_counters[gpe_number].count++;
 270         else
 271                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
 272                                         count++;
 273
 274         return;
 275 }
 276
 277 void acpi_os_fixed_event_count(u32 event_number)
 278 {
 279         if (!all_counters)
 280                 return;
 281
 282         if (event_number < ACPI_NUM_FIXED_EVENTS)
 283                 all_counters[num_gpes + event_number].count++;
 284         else
 285                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
 286                                 count++;
 287
 288         return;
 289 }
 290
 291 static int get_status(u32 index, acpi_event_status *status, acpi_handle *handle)
 292 {
 293         int result = 0;
 294
 295         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 296                 goto end;
 297
 298         if (index < num_gpes) {
 299                 result = acpi_get_gpe_device(index, handle);
 300                 if (result) {
 301                         ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
 302                                 "Invalid GPE 0x%x\n", index));
 303                         goto end;
 304                 }
 305                 result = acpi_get_gpe_status(*handle, index,
 306                                                 ACPI_NOT_ISR, status);
 307         } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
 308                 result = acpi_get_event_status(index - num_gpes, status);
 309
 310 end:
 311         return result;
 312 }
 313
 314 static ssize_t counter_show(struct kobject *kobj,
 315         struct kobj_attribute *attr, char *buf)
 316 {
 317         int index = attr - counter_attrs;
 318         int size;
 319         acpi_handle handle;
 320         acpi_event_status status;
 321         int result = 0;
 322
 323         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
 324                 acpi_irq_handled;
 325         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
 326                 acpi_irq_not_handled;
 327         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
 328                 acpi_gpe_count;
 329
 330         size = sprintf(buf, "%8d", all_counters[index].count);
 331
 332         /* "gpe_all" or "sci" */
 333         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 334                 goto end;
 335
 336         result = get_status(index, &status, &handle);
 337         if (result)
 338                 goto end;
 339
 340         if (!(status & ACPI_EVENT_FLAG_HANDLE))
 341                 size += sprintf(buf + size, "   invalid");
 342         else if (status & ACPI_EVENT_FLAG_ENABLED)
 343                 size += sprintf(buf + size, "   enabled");
 344         else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
 345                 size += sprintf(buf + size, "   wake_enabled");
 346         else
 347                 size += sprintf(buf + size, "   disabled");
 348
 349 end:
 350         size += sprintf(buf + size, "\n");
 351         return result ? result : size;
 352 }
 353
 354 /*
 355  * counter_set() sets the specified counter.
 356  * setting the total "sci" file to any value clears all counters.
 357  * enable/disable/clear a gpe/fixed event in user space.
 358  */
 359 static ssize_t counter_set(struct kobject *kobj,
 360         struct kobj_attribute *attr, const char *buf, size_t size)
 361 {
 362         int index = attr - counter_attrs;
 363         acpi_event_status status;
 364         acpi_handle handle;
 365         int result = 0;
 366
 367         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
 368                 int i;
 369                 for (i = 0; i < num_counters; ++i)
 370                         all_counters[i].count = 0;
 371                 acpi_gpe_count = 0;
 372                 acpi_irq_handled = 0;
 373                 acpi_irq_not_handled = 0;
 374                 goto end;
 375         }
 376
 377         /* show the event status for both GPEs and Fixed Events */
 378         result = get_status(index, &status, &handle);
 379         if (result)
 380                 goto end;
 381
 382         if (!(status & ACPI_EVENT_FLAG_HANDLE)) {
 383                 printk(KERN_WARNING PREFIX
 384                         "Can not change Invalid GPE/Fixed Event status\n");
 385                 return -EINVAL;
 386         }
 387
 388         if (index < num_gpes) {
 389                 if (!strcmp(buf, "disable\n") &&
 390                                 (status & ACPI_EVENT_FLAG_ENABLED))
 391                         result = acpi_set_gpe(handle, index, ACPI_GPE_DISABLE);
 392                 else if (!strcmp(buf, "enable\n") &&
 393                                 !(status & ACPI_EVENT_FLAG_ENABLED))
 394                         result = acpi_set_gpe(handle, index, ACPI_GPE_ENABLE);
 395                 else if (!strcmp(buf, "clear\n") &&
 396                                 (status & ACPI_EVENT_FLAG_SET))
 397                         result = acpi_clear_gpe(handle, index, ACPI_NOT_ISR);
 398                 else
 399                         all_counters[index].count = strtoul(buf, NULL, 0);
 400         } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
 401                 int event = index - num_gpes;
 402                 if (!strcmp(buf, "disable\n") &&
 403                                 (status & ACPI_EVENT_FLAG_ENABLED))
 404                         result = acpi_disable_event(event, ACPI_NOT_ISR);
 405                 else if (!strcmp(buf, "enable\n") &&
 406                                 !(status & ACPI_EVENT_FLAG_ENABLED))
 407                         result = acpi_enable_event(event, ACPI_NOT_ISR);
 408                 else if (!strcmp(buf, "clear\n") &&
 409                                 (status & ACPI_EVENT_FLAG_SET))
 410                         result = acpi_clear_event(event);
 411                 else
 412                         all_counters[index].count = strtoul(buf, NULL, 0);
 413         } else
 414                 all_counters[index].count = strtoul(buf, NULL, 0);
 415
 416         if (ACPI_FAILURE(result))
 417                 result = -EINVAL;
 418 end:
 419         return result ? result : size;
 420 }
 421
 422 void acpi_irq_stats_init(void)
 423 {
 424         int i;
 425
 426         if (all_counters)
 427                 return;
 428
 429         num_gpes = acpi_current_gpe_count;
 430         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
 431
 432         all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
 433                         GFP_KERNEL);
 434         if (all_attrs == NULL)
 435                 return;
 436
 437         all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
 438                                 GFP_KERNEL);
 439         if (all_counters == NULL)
 440                 goto fail;
 441
 442         counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
 443                         GFP_KERNEL);
 444         if (counter_attrs == NULL)
 445                 goto fail;
 446
 447         for (i = 0; i < num_counters; ++i) {
 448                 char buffer[12];
 449                 char *name;
 450
 451                 if (i < num_gpes)
 452                         sprintf(buffer, "gpe%02X", i);
 453                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
 454                         sprintf(buffer, "ff_pmtimer");
 455                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
 456                         sprintf(buffer, "ff_gbl_lock");
 457                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
 458                         sprintf(buffer, "ff_pwr_btn");
 459                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
 460                         sprintf(buffer, "ff_slp_btn");
 461                 else if (i == num_gpes + ACPI_EVENT_RTC)
 462                         sprintf(buffer, "ff_rt_clk");
 463                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
 464                         sprintf(buffer, "gpe_all");
 465                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
 466                         sprintf(buffer, "sci");
 467                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
 468                         sprintf(buffer, "sci_not");
 469                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
 470                         sprintf(buffer, "error");
 471                 else
 472                         sprintf(buffer, "bug%02X", i);
 473
 474                 name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
 475                 if (name == NULL)
 476                         goto fail;
 477                 strncpy(name, buffer, strlen(buffer) + 1);
 478
 479                 sysfs_attr_init(&counter_attrs[i].attr);
 480                 counter_attrs[i].attr.name = name;
 481                 counter_attrs[i].attr.mode = 0644;
 482                 counter_attrs[i].show = counter_show;
 483                 counter_attrs[i].store = counter_set;
 484
 485                 all_attrs[i] = &counter_attrs[i].attr;
 486         }
 487
 488         interrupt_stats_attr_group.attrs = all_attrs;
 489         if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
 490                 return;
 491
 492 fail:
 493         delete_gpe_attr_array();
 494         return;
 495 }
 496
 497 static void __exit interrupt_stats_exit(void)
 498 {
 499         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
 500
 501         delete_gpe_attr_array();
 502
 503         return;
 504 }
 505
 506 /* --------------------------------------------------------------------------
 507                               FS Interface (/proc)
 508    -------------------------------------------------------------------------- */
 509 #ifdef CONFIG_ACPI_PROCFS
 510 #define ACPI_SYSTEM_FILE_INFO           "info"
 511 #define ACPI_SYSTEM_FILE_EVENT          "event"
 512 #define ACPI_SYSTEM_FILE_DSDT           "dsdt"
 513 #define ACPI_SYSTEM_FILE_FADT           "fadt"
 514
 515 static int acpi_system_read_info(struct seq_file *seq, void *offset)
 516 {
 517
 518         seq_printf(seq, "version:                 %x\n", ACPI_CA_VERSION);
 519         return 0;
 520 }
 521
 522 static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
 523 {
 524         return single_open(file, acpi_system_read_info, PDE(inode)->data);
 525 }
 526
 527 static const struct file_operations acpi_system_info_ops = {
 528         .owner = THIS_MODULE,
 529         .open = acpi_system_info_open_fs,
 530         .read = seq_read,
 531         .llseek = seq_lseek,
 532         .release = single_release,
 533 };
 534
 535 static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
 536                                      loff_t *);
 537
 538 static const struct file_operations acpi_system_dsdt_ops = {
 539         .owner = THIS_MODULE,
 540         .read = acpi_system_read_dsdt,
 541 };
 542
 543 static ssize_t
 544 acpi_system_read_dsdt(struct file *file,
 545                       char __user * buffer, size_t count, loff_t * ppos)
 546 {
 547         acpi_status status = AE_OK;
 548         struct acpi_table_header *dsdt = NULL;
 549         ssize_t res;
 550
 551         status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
 552         if (ACPI_FAILURE(status))
 553                 return -ENODEV;
 554
 555         res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);
 556
 557         return res;
 558 }
 559
 560 static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
 561                                      loff_t *);
 562
 563 static const struct file_operations acpi_system_fadt_ops = {
 564         .owner = THIS_MODULE,
 565         .read = acpi_system_read_fadt,
 566 };
 567
 568 static ssize_t
 569 acpi_system_read_fadt(struct file *file,
 570                       char __user * buffer, size_t count, loff_t * ppos)
 571 {
 572         acpi_status status = AE_OK;
 573         struct acpi_table_header *fadt = NULL;
 574         ssize_t res;
 575
 576         status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
 577         if (ACPI_FAILURE(status))
 578                 return -ENODEV;
 579
 580         res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);
 581
 582         return res;
 583 }
 584
 585 static int acpi_system_procfs_init(void)
 586 {
 587         struct proc_dir_entry *entry;
 588         int error = 0;
 589
 590         /* 'info' [R] */
 591         entry = proc_create(ACPI_SYSTEM_FILE_INFO, S_IRUGO, acpi_root_dir,
 592                             &acpi_system_info_ops);
 593         if (!entry)
 594                 goto Error;
 595
 596         /* 'dsdt' [R] */
 597         entry = proc_create(ACPI_SYSTEM_FILE_DSDT, S_IRUSR, acpi_root_dir,
 598                             &acpi_system_dsdt_ops);
 599         if (!entry)
 600                 goto Error;
 601
 602         /* 'fadt' [R] */
 603         entry = proc_create(ACPI_SYSTEM_FILE_FADT, S_IRUSR, acpi_root_dir,
 604                             &acpi_system_fadt_ops);
 605         if (!entry)
 606                 goto Error;
 607
 608       Done:
 609         return error;
 610
 611       Error:
 612         remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
 613         remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
 614         remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
 615
 616         error = -EFAULT;
 617         goto Done;
 618 }
 619 #else
 620 static int acpi_system_procfs_init(void)
 621 {
 622         return 0;
 623 }
 624 #endif
 625
 626 int __init acpi_system_init(void)
 627 {
 628         int result;
 629
 630         result = acpi_system_procfs_init();
 631         if (result)
 632                 return result;
 633
 634         result = acpi_system_sysfs_init();
 635
 636         return result;
 637 }