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/slab.h>
  29 #include <linux/init.h>
  30 #include <linux/string.h>
  31 #include <asm/uaccess.h>
  32
  33 #include <acpi/acpi_drivers.h>
  34
  35 #define PREFIX "ACPI: "
  36
  37 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  38 ACPI_MODULE_NAME("system");
  39
  40 #define ACPI_SYSTEM_CLASS               "system"
  41 #define ACPI_SYSTEM_DEVICE_NAME         "System"
  42
  43 u32 acpi_irq_handled;
  44 u32 acpi_irq_not_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         sysfs_attr_init(&table_attr->attr.attr);
 106         if (table_header->signature[0] != '\0')
 107                 memcpy(table_attr->name, table_header->signature,
 108                         ACPI_NAME_SIZE);
 109         else
 110                 memcpy(table_attr->name, "NULL", 4);
 111
 112         list_for_each_entry(attr, &acpi_table_attr_list, node) {
 113                 if (!memcmp(table_attr->name, attr->name, ACPI_NAME_SIZE))
 114                         if (table_attr->instance < attr->instance)
 115                                 table_attr->instance = attr->instance;
 116         }
 117         table_attr->instance++;
 118
 119         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
 120                                         !acpi_get_table
 121                                         (table_header->signature, 2, &header)))
 122                 sprintf(table_attr->name + ACPI_NAME_SIZE, "%d",
 123                         table_attr->instance);
 124
 125         table_attr->attr.size = 0;
 126         table_attr->attr.read = acpi_table_show;
 127         table_attr->attr.attr.name = table_attr->name;
 128         table_attr->attr.attr.mode = 0400;
 129
 130         return;
 131 }
 132
 133 static acpi_status
 134 acpi_sysfs_table_handler(u32 event, void *table, void *context)
 135 {
 136         struct acpi_table_attr *table_attr;
 137
 138         switch (event) {
 139         case ACPI_TABLE_EVENT_LOAD:
 140                 table_attr =
 141                         kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
 142                 if (!table_attr)
 143                         return AE_NO_MEMORY;
 144
 145                 acpi_table_attr_init(table_attr, table);
 146                 if (sysfs_create_bin_file(dynamic_tables_kobj,
 147                                         &table_attr->attr)) {
 148                         kfree(table_attr);
 149                         return AE_ERROR;
 150                 } else
 151                         list_add_tail(&table_attr->node,
 152                                         &acpi_table_attr_list);
 153                 break;
 154         case ACPI_TABLE_EVENT_UNLOAD:
 155                 /*
 156                  * we do not need to do anything right now
 157                  * because the table is not deleted from the
 158                  * global table list when unloading it.
 159                  */
 160                 break;
 161         default:
 162                 return AE_BAD_PARAMETER;
 163         }
 164         return AE_OK;
 165 }
 166
 167 static int acpi_system_sysfs_init(void)
 168 {
 169         struct acpi_table_attr *table_attr;
 170         struct acpi_table_header *table_header = NULL;
 171         int table_index = 0;
 172         int result;
 173
 174         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
 175         if (!tables_kobj)
 176                 goto err;
 177
 178         dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
 179         if (!dynamic_tables_kobj)
 180                 goto err_dynamic_tables;
 181
 182         do {
 183                 result = acpi_get_table_by_index(table_index, &table_header);
 184                 if (!result) {
 185                         table_index++;
 186                         table_attr = NULL;
 187                         table_attr =
 188                             kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
 189                         if (!table_attr)
 190                                 return -ENOMEM;
 191
 192                         acpi_table_attr_init(table_attr, table_header);
 193                         result =
 194                             sysfs_create_bin_file(tables_kobj,
 195                                                   &table_attr->attr);
 196                         if (result) {
 197                                 kfree(table_attr);
 198                                 return result;
 199                         } else
 200                                 list_add_tail(&table_attr->node,
 201                                               &acpi_table_attr_list);
 202                 }
 203         } while (!result);
 204         kobject_uevent(tables_kobj, KOBJ_ADD);
 205         kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
 206         result = acpi_install_table_handler(acpi_sysfs_table_handler, NULL);
 207
 208         return result == AE_OK ? 0 : -EINVAL;
 209 err_dynamic_tables:
 210         kobject_put(tables_kobj);
 211 err:
 212         return -ENOMEM;
 213 }
 214
 215 /*
 216  * Detailed ACPI IRQ counters in /sys/firmware/acpi/interrupts/
 217  * See Documentation/ABI/testing/sysfs-firmware-acpi
 218  */
 219
 220 #define COUNT_GPE 0
 221 #define COUNT_SCI 1     /* acpi_irq_handled */
 222 #define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */
 223 #define COUNT_ERROR 3   /* other */
 224 #define NUM_COUNTERS_EXTRA 4
 225
 226 struct event_counter {
 227         u32 count;
 228         u32 flags;
 229 };
 230
 231 static struct event_counter *all_counters;
 232 static u32 num_gpes;
 233 static u32 num_counters;
 234 static struct attribute **all_attrs;
 235 static u32 acpi_gpe_count;
 236
 237 static struct attribute_group interrupt_stats_attr_group = {
 238         .name = "interrupts",
 239 };
 240 static struct kobj_attribute *counter_attrs;
 241
 242 static void delete_gpe_attr_array(void)
 243 {
 244         struct event_counter *tmp = all_counters;
 245
 246         all_counters = NULL;
 247         kfree(tmp);
 248
 249         if (counter_attrs) {
 250                 int i;
 251
 252                 for (i = 0; i < num_gpes; i++)
 253                         kfree(counter_attrs[i].attr.name);
 254
 255                 kfree(counter_attrs);
 256         }
 257         kfree(all_attrs);
 258
 259         return;
 260 }
 261
 262 void acpi_os_gpe_count(u32 gpe_number)
 263 {
 264         acpi_gpe_count++;
 265
 266         if (!all_counters)
 267                 return;
 268
 269         if (gpe_number < num_gpes)
 270                 all_counters[gpe_number].count++;
 271         else
 272                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
 273                                         count++;
 274
 275         return;
 276 }
 277
 278 void acpi_os_fixed_event_count(u32 event_number)
 279 {
 280         if (!all_counters)
 281                 return;
 282
 283         if (event_number < ACPI_NUM_FIXED_EVENTS)
 284                 all_counters[num_gpes + event_number].count++;
 285         else
 286                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
 287                                 count++;
 288
 289         return;
 290 }
 291
 292 static int get_status(u32 index, acpi_event_status *status, acpi_handle *handle)
 293 {
 294         int result = 0;
 295
 296         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 297                 goto end;
 298
 299         if (index < num_gpes) {
 300                 result = acpi_get_gpe_device(index, handle);
 301                 if (result) {
 302                         ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
 303                                 "Invalid GPE 0x%x\n", index));
 304                         goto end;
 305                 }
 306                 result = acpi_get_gpe_status(*handle, index,
 307                                                 ACPI_NOT_ISR, status);
 308         } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
 309                 result = acpi_get_event_status(index - num_gpes, status);
 310
 311 end:
 312         return result;
 313 }
 314
 315 static ssize_t counter_show(struct kobject *kobj,
 316         struct kobj_attribute *attr, char *buf)
 317 {
 318         int index = attr - counter_attrs;
 319         int size;
 320         acpi_handle handle;
 321         acpi_event_status status;
 322         int result = 0;
 323
 324         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
 325                 acpi_irq_handled;
 326         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
 327                 acpi_irq_not_handled;
 328         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
 329                 acpi_gpe_count;
 330
 331         size = sprintf(buf, "%8d", all_counters[index].count);
 332
 333         /* "gpe_all" or "sci" */
 334         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 335                 goto end;
 336
 337         result = get_status(index, &status, &handle);
 338         if (result)
 339                 goto end;
 340
 341         if (!(status & ACPI_EVENT_FLAG_HANDLE))
 342                 size += sprintf(buf + size, "   invalid");
 343         else if (status & ACPI_EVENT_FLAG_ENABLED)
 344                 size += sprintf(buf + size, "   enabled");
 345         else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
 346                 size += sprintf(buf + size, "   wake_enabled");
 347         else
 348                 size += sprintf(buf + size, "   disabled");
 349
 350 end:
 351         size += sprintf(buf + size, "\n");
 352         return result ? result : size;
 353 }
 354
 355 /*
 356  * counter_set() sets the specified counter.
 357  * setting the total "sci" file to any value clears all counters.
 358  * enable/disable/clear a gpe/fixed event in user space.
 359  */
 360 static ssize_t counter_set(struct kobject *kobj,
 361         struct kobj_attribute *attr, const char *buf, size_t size)
 362 {
 363         int index = attr - counter_attrs;
 364         acpi_event_status status;
 365         acpi_handle handle;
 366         int result = 0;
 367
 368         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
 369                 int i;
 370                 for (i = 0; i < num_counters; ++i)
 371                         all_counters[i].count = 0;
 372                 acpi_gpe_count = 0;
 373                 acpi_irq_handled = 0;
 374                 acpi_irq_not_handled = 0;
 375                 goto end;
 376         }
 377
 378         /* show the event status for both GPEs and Fixed Events */
 379         result = get_status(index, &status, &handle);
 380         if (result)
 381                 goto end;
 382
 383         if (!(status & ACPI_EVENT_FLAG_HANDLE)) {
 384                 printk(KERN_WARNING PREFIX
 385                         "Can not change Invalid GPE/Fixed Event status\n");
 386                 return -EINVAL;
 387         }
 388
 389         if (index < num_gpes) {
 390                 if (!strcmp(buf, "disable\n") &&
 391                                 (status & ACPI_EVENT_FLAG_ENABLED))
 392                         result = acpi_set_gpe(handle, index, ACPI_GPE_DISABLE);
 393                 else if (!strcmp(buf, "enable\n") &&
 394                                 !(status & ACPI_EVENT_FLAG_ENABLED))
 395                         result = acpi_set_gpe(handle, index, ACPI_GPE_ENABLE);
 396                 else if (!strcmp(buf, "clear\n") &&
 397                                 (status & ACPI_EVENT_FLAG_SET))
 398                         result = acpi_clear_gpe(handle, index, ACPI_NOT_ISR);
 399                 else
 400                         all_counters[index].count = strtoul(buf, NULL, 0);
 401         } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
 402                 int event = index - num_gpes;
 403                 if (!strcmp(buf, "disable\n") &&
 404                                 (status & ACPI_EVENT_FLAG_ENABLED))
 405                         result = acpi_disable_event(event, ACPI_NOT_ISR);
 406                 else if (!strcmp(buf, "enable\n") &&
 407                                 !(status & ACPI_EVENT_FLAG_ENABLED))
 408                         result = acpi_enable_event(event, ACPI_NOT_ISR);
 409                 else if (!strcmp(buf, "clear\n") &&
 410                                 (status & ACPI_EVENT_FLAG_SET))
 411                         result = acpi_clear_event(event);
 412                 else
 413                         all_counters[index].count = strtoul(buf, NULL, 0);
 414         } else
 415                 all_counters[index].count = strtoul(buf, NULL, 0);
 416
 417         if (ACPI_FAILURE(result))
 418                 result = -EINVAL;
 419 end:
 420         return result ? result : size;
 421 }
 422
 423 void acpi_irq_stats_init(void)
 424 {
 425         int i;
 426
 427         if (all_counters)
 428                 return;
 429
 430         num_gpes = acpi_current_gpe_count;
 431         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
 432
 433         all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
 434                         GFP_KERNEL);
 435         if (all_attrs == NULL)
 436                 return;
 437
 438         all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
 439                                 GFP_KERNEL);
 440         if (all_counters == NULL)
 441                 goto fail;
 442
 443         counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
 444                         GFP_KERNEL);
 445         if (counter_attrs == NULL)
 446                 goto fail;
 447
 448         for (i = 0; i < num_counters; ++i) {
 449                 char buffer[12];
 450                 char *name;
 451
 452                 if (i < num_gpes)
 453                         sprintf(buffer, "gpe%02X", i);
 454                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
 455                         sprintf(buffer, "ff_pmtimer");
 456                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
 457                         sprintf(buffer, "ff_gbl_lock");
 458                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
 459                         sprintf(buffer, "ff_pwr_btn");
 460                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
 461                         sprintf(buffer, "ff_slp_btn");
 462                 else if (i == num_gpes + ACPI_EVENT_RTC)
 463                         sprintf(buffer, "ff_rt_clk");
 464                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
 465                         sprintf(buffer, "gpe_all");
 466                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
 467                         sprintf(buffer, "sci");
 468                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
 469                         sprintf(buffer, "sci_not");
 470                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
 471                         sprintf(buffer, "error");
 472                 else
 473                         sprintf(buffer, "bug%02X", i);
 474
 475                 name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
 476                 if (name == NULL)
 477                         goto fail;
 478                 strncpy(name, buffer, strlen(buffer) + 1);
 479
 480                 sysfs_attr_init(&counter_attrs[i].attr);
 481                 counter_attrs[i].attr.name = name;
 482                 counter_attrs[i].attr.mode = 0644;
 483                 counter_attrs[i].show = counter_show;
 484                 counter_attrs[i].store = counter_set;
 485
 486                 all_attrs[i] = &counter_attrs[i].attr;
 487         }
 488
 489         interrupt_stats_attr_group.attrs = all_attrs;
 490         if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
 491                 return;
 492
 493 fail:
 494         delete_gpe_attr_array();
 495         return;
 496 }
 497
 498 static void __exit interrupt_stats_exit(void)
 499 {
 500         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
 501
 502         delete_gpe_attr_array();
 503
 504         return;
 505 }
 506
 507 /* --------------------------------------------------------------------------
 508                               FS Interface (/proc)
 509    -------------------------------------------------------------------------- */
 510 #ifdef CONFIG_ACPI_PROCFS
 511 #define ACPI_SYSTEM_FILE_INFO           "info"
 512 #define ACPI_SYSTEM_FILE_EVENT          "event"
 513 #define ACPI_SYSTEM_FILE_DSDT           "dsdt"
 514 #define ACPI_SYSTEM_FILE_FADT           "fadt"
 515
 516 static int acpi_system_read_info(struct seq_file *seq, void *offset)
 517 {
 518
 519         seq_printf(seq, "version:                 %x\n", ACPI_CA_VERSION);
 520         return 0;
 521 }
 522
 523 static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
 524 {
 525         return single_open(file, acpi_system_read_info, PDE(inode)->data);
 526 }
 527
 528 static const struct file_operations acpi_system_info_ops = {
 529         .owner = THIS_MODULE,
 530         .open = acpi_system_info_open_fs,
 531         .read = seq_read,
 532         .llseek = seq_lseek,
 533         .release = single_release,
 534 };
 535
 536 static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
 537                                      loff_t *);
 538
 539 static const struct file_operations acpi_system_dsdt_ops = {
 540         .owner = THIS_MODULE,
 541         .read = acpi_system_read_dsdt,
 542 };
 543
 544 static ssize_t
 545 acpi_system_read_dsdt(struct file *file,
 546                       char __user * buffer, size_t count, loff_t * ppos)
 547 {
 548         acpi_status status = AE_OK;
 549         struct acpi_table_header *dsdt = NULL;
 550         ssize_t res;
 551
 552         status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
 553         if (ACPI_FAILURE(status))
 554                 return -ENODEV;
 555
 556         res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);
 557
 558         return res;
 559 }
 560
 561 static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
 562                                      loff_t *);
 563
 564 static const struct file_operations acpi_system_fadt_ops = {
 565         .owner = THIS_MODULE,
 566         .read = acpi_system_read_fadt,
 567 };
 568
 569 static ssize_t
 570 acpi_system_read_fadt(struct file *file,
 571                       char __user * buffer, size_t count, loff_t * ppos)
 572 {
 573         acpi_status status = AE_OK;
 574         struct acpi_table_header *fadt = NULL;
 575         ssize_t res;
 576
 577         status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
 578         if (ACPI_FAILURE(status))
 579                 return -ENODEV;
 580
 581         res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);
 582
 583         return res;
 584 }
 585
 586 static int acpi_system_procfs_init(void)
 587 {
 588         struct proc_dir_entry *entry;
 589         int error = 0;
 590
 591         /* 'info' [R] */
 592         entry = proc_create(ACPI_SYSTEM_FILE_INFO, S_IRUGO, acpi_root_dir,
 593                             &acpi_system_info_ops);
 594         if (!entry)
 595                 goto Error;
 596
 597         /* 'dsdt' [R] */
 598         entry = proc_create(ACPI_SYSTEM_FILE_DSDT, S_IRUSR, acpi_root_dir,
 599                             &acpi_system_dsdt_ops);
 600         if (!entry)
 601                 goto Error;
 602
 603         /* 'fadt' [R] */
 604         entry = proc_create(ACPI_SYSTEM_FILE_FADT, S_IRUSR, acpi_root_dir,
 605                             &acpi_system_fadt_ops);
 606         if (!entry)
 607                 goto Error;
 608
 609       Done:
 610         return error;
 611
 612       Error:
 613         remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
 614         remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
 615         remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
 616
 617         error = -EFAULT;
 618         goto Done;
 619 }
 620 #else
 621 static int acpi_system_procfs_init(void)
 622 {
 623         return 0;
 624 }
 625 #endif
 626
 627 int __init acpi_system_init(void)
 628 {
 629         int result;
 630
 631         result = acpi_system_procfs_init();
 632         if (result)
 633                 return result;
 634
 635         result = acpi_system_sysfs_init();
 636
 637         return result;
 638 }