drivers/acpi/system.c

   1 /*
   2  *  acpi_system.c - ACPI System Driver ($Revision: 63 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/proc_fs.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/init.h>
  29 #include <linux/string.h>
  30 #include <asm/uaccess.h>
  31
  32 #include <acpi/acpi_drivers.h>
  33
  34 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  35 ACPI_MODULE_NAME("system");
  36 #ifdef MODULE_PARAM_PREFIX
  37 #undef MODULE_PARAM_PREFIX
  38 #endif
  39 #define MODULE_PARAM_PREFIX "acpi."
  40
  41 #define ACPI_SYSTEM_CLASS               "system"
  42 #define ACPI_SYSTEM_DEVICE_NAME         "System"
  43
  44 u32 acpi_irq_handled;
  45
  46 /*
  47  * Make ACPICA version work as module param
  48  */
  49 static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
  50 {
  51         int result;
  52
  53         result = sprintf(buffer, "%x", ACPI_CA_VERSION);
  54
  55         return result;
  56 }
  57
  58 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
  59
  60 /* --------------------------------------------------------------------------
  61                               FS Interface (/sys)
  62    -------------------------------------------------------------------------- */
  63 static LIST_HEAD(acpi_table_attr_list);
  64 static struct kobject *tables_kobj;
  65 static struct kobject *dynamic_tables_kobj;
  66
  67 struct acpi_table_attr {
  68         struct bin_attribute attr;
  69         char name[8];
  70         int instance;
  71         struct list_head node;
  72 };
  73
  74 static ssize_t acpi_table_show(struct kobject *kobj,
  75                                struct bin_attribute *bin_attr, char *buf,
  76                                loff_t offset, size_t count)
  77 {
  78         struct acpi_table_attr *table_attr =
  79             container_of(bin_attr, struct acpi_table_attr, attr);
  80         struct acpi_table_header *table_header = NULL;
  81         acpi_status status;
  82         char name[ACPI_NAME_SIZE];
  83
  84         if (strncmp(table_attr->name, "NULL", 4))
  85                 memcpy(name, table_attr->name, ACPI_NAME_SIZE);
  86         else
  87                 memcpy(name, "\0\0\0\0", 4);
  88
  89         status =
  90             acpi_get_table(name, table_attr->instance,
  91                            &table_header);
  92         if (ACPI_FAILURE(status))
  93                 return -ENODEV;
  94
  95         return memory_read_from_buffer(buf, count, &offset,
  96                                         table_header, table_header->length);
  97 }
  98
  99 static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
 100                                  struct acpi_table_header *table_header)
 101 {
 102         struct acpi_table_header *header = NULL;
 103         struct acpi_table_attr *attr = NULL;
 104
 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 = 0444;
 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_ERROR 2   /* other */
 222 #define NUM_COUNTERS_EXTRA 3
 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_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                 goto end;
 371         }
 372
 373         /* show the event status for both GPEs and Fixed Events */
 374         result = get_status(index, &status, &handle);
 375         if (result)
 376                 goto end;
 377
 378         if (!(status & ACPI_EVENT_FLAG_HANDLE)) {
 379                 printk(KERN_WARNING PREFIX
 380                         "Can not change Invalid GPE/Fixed Event status\n");
 381                 return -EINVAL;
 382         }
 383
 384         if (index < num_gpes) {
 385                 if (!strcmp(buf, "disable\n") &&
 386                                 (status & ACPI_EVENT_FLAG_ENABLED))
 387                         result = acpi_disable_gpe(handle, index);
 388                 else if (!strcmp(buf, "enable\n") &&
 389                                 !(status & ACPI_EVENT_FLAG_ENABLED))
 390                         result = acpi_enable_gpe(handle, index);
 391                 else if (!strcmp(buf, "clear\n") &&
 392                                 (status & ACPI_EVENT_FLAG_SET))
 393                         result = acpi_clear_gpe(handle, index, ACPI_NOT_ISR);
 394                 else
 395                         all_counters[index].count = strtoul(buf, NULL, 0);
 396         } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
 397                 int event = index - num_gpes;
 398                 if (!strcmp(buf, "disable\n") &&
 399                                 (status & ACPI_EVENT_FLAG_ENABLED))
 400                         result = acpi_disable_event(event, ACPI_NOT_ISR);
 401                 else if (!strcmp(buf, "enable\n") &&
 402                                 !(status & ACPI_EVENT_FLAG_ENABLED))
 403                         result = acpi_enable_event(event, ACPI_NOT_ISR);
 404                 else if (!strcmp(buf, "clear\n") &&
 405                                 (status & ACPI_EVENT_FLAG_SET))
 406                         result = acpi_clear_event(event);
 407                 else
 408                         all_counters[index].count = strtoul(buf, NULL, 0);
 409         } else
 410                 all_counters[index].count = strtoul(buf, NULL, 0);
 411
 412         if (ACPI_FAILURE(result))
 413                 result = -EINVAL;
 414 end:
 415         return result ? result : size;
 416 }
 417
 418 void acpi_irq_stats_init(void)
 419 {
 420         int i;
 421
 422         if (all_counters)
 423                 return;
 424
 425         num_gpes = acpi_current_gpe_count;
 426         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
 427
 428         all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
 429                         GFP_KERNEL);
 430         if (all_attrs == NULL)
 431                 return;
 432
 433         all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
 434                                 GFP_KERNEL);
 435         if (all_counters == NULL)
 436                 goto fail;
 437
 438         counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
 439                         GFP_KERNEL);
 440         if (counter_attrs == NULL)
 441                 goto fail;
 442
 443         for (i = 0; i < num_counters; ++i) {
 444                 char buffer[12];
 445                 char *name;
 446
 447                 if (i < num_gpes)
 448                         sprintf(buffer, "gpe%02X", i);
 449                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
 450                         sprintf(buffer, "ff_pmtimer");
 451                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
 452                         sprintf(buffer, "ff_gbl_lock");
 453                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
 454                         sprintf(buffer, "ff_pwr_btn");
 455                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
 456                         sprintf(buffer, "ff_slp_btn");
 457                 else if (i == num_gpes + ACPI_EVENT_RTC)
 458                         sprintf(buffer, "ff_rt_clk");
 459                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
 460                         sprintf(buffer, "gpe_all");
 461                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
 462                         sprintf(buffer, "sci");
 463                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
 464                         sprintf(buffer, "error");
 465                 else
 466                         sprintf(buffer, "bug%02X", i);
 467
 468                 name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
 469                 if (name == NULL)
 470                         goto fail;
 471                 strncpy(name, buffer, strlen(buffer) + 1);
 472
 473                 counter_attrs[i].attr.name = name;
 474                 counter_attrs[i].attr.mode = 0644;
 475                 counter_attrs[i].show = counter_show;
 476                 counter_attrs[i].store = counter_set;
 477
 478                 all_attrs[i] = &counter_attrs[i].attr;
 479         }
 480
 481         interrupt_stats_attr_group.attrs = all_attrs;
 482         if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
 483                 return;
 484
 485 fail:
 486         delete_gpe_attr_array();
 487         return;
 488 }
 489
 490 static void __exit interrupt_stats_exit(void)
 491 {
 492         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
 493
 494         delete_gpe_attr_array();
 495
 496         return;
 497 }
 498
 499 /* --------------------------------------------------------------------------
 500                               FS Interface (/proc)
 501    -------------------------------------------------------------------------- */
 502 #ifdef CONFIG_ACPI_PROCFS
 503 #define ACPI_SYSTEM_FILE_INFO           "info"
 504 #define ACPI_SYSTEM_FILE_EVENT          "event"
 505 #define ACPI_SYSTEM_FILE_DSDT           "dsdt"
 506 #define ACPI_SYSTEM_FILE_FADT           "fadt"
 507
 508 static int acpi_system_read_info(struct seq_file *seq, void *offset)
 509 {
 510
 511         seq_printf(seq, "version:                 %x\n", ACPI_CA_VERSION);
 512         return 0;
 513 }
 514
 515 static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
 516 {
 517         return single_open(file, acpi_system_read_info, PDE(inode)->data);
 518 }
 519
 520 static const struct file_operations acpi_system_info_ops = {
 521         .owner = THIS_MODULE,
 522         .open = acpi_system_info_open_fs,
 523         .read = seq_read,
 524         .llseek = seq_lseek,
 525         .release = single_release,
 526 };
 527
 528 static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
 529                                      loff_t *);
 530
 531 static const struct file_operations acpi_system_dsdt_ops = {
 532         .owner = THIS_MODULE,
 533         .read = acpi_system_read_dsdt,
 534 };
 535
 536 static ssize_t
 537 acpi_system_read_dsdt(struct file *file,
 538                       char __user * buffer, size_t count, loff_t * ppos)
 539 {
 540         acpi_status status = AE_OK;
 541         struct acpi_table_header *dsdt = NULL;
 542         ssize_t res;
 543
 544         status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
 545         if (ACPI_FAILURE(status))
 546                 return -ENODEV;
 547
 548         res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);
 549
 550         return res;
 551 }
 552
 553 static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
 554                                      loff_t *);
 555
 556 static const struct file_operations acpi_system_fadt_ops = {
 557         .owner = THIS_MODULE,
 558         .read = acpi_system_read_fadt,
 559 };
 560
 561 static ssize_t
 562 acpi_system_read_fadt(struct file *file,
 563                       char __user * buffer, size_t count, loff_t * ppos)
 564 {
 565         acpi_status status = AE_OK;
 566         struct acpi_table_header *fadt = NULL;
 567         ssize_t res;
 568
 569         status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
 570         if (ACPI_FAILURE(status))
 571                 return -ENODEV;
 572
 573         res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);
 574
 575         return res;
 576 }
 577
 578 static int acpi_system_procfs_init(void)
 579 {
 580         struct proc_dir_entry *entry;
 581         int error = 0;
 582
 583         /* 'info' [R] */
 584         entry = proc_create(ACPI_SYSTEM_FILE_INFO, S_IRUGO, acpi_root_dir,
 585                             &acpi_system_info_ops);
 586         if (!entry)
 587                 goto Error;
 588
 589         /* 'dsdt' [R] */
 590         entry = proc_create(ACPI_SYSTEM_FILE_DSDT, S_IRUSR, acpi_root_dir,
 591                             &acpi_system_dsdt_ops);
 592         if (!entry)
 593                 goto Error;
 594
 595         /* 'fadt' [R] */
 596         entry = proc_create(ACPI_SYSTEM_FILE_FADT, S_IRUSR, acpi_root_dir,
 597                             &acpi_system_fadt_ops);
 598         if (!entry)
 599                 goto Error;
 600
 601       Done:
 602         return error;
 603
 604       Error:
 605         remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
 606         remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
 607         remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
 608
 609         error = -EFAULT;
 610         goto Done;
 611 }
 612 #else
 613 static int acpi_system_procfs_init(void)
 614 {
 615         return 0;
 616 }
 617 #endif
 618
 619 int __init acpi_system_init(void)
 620 {
 621         int result;
 622
 623         result = acpi_system_procfs_init();
 624         if (result)
 625                 return result;
 626
 627         result = acpi_system_sysfs_init();
 628
 629         return result;
 630 }