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