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 }