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
  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
  82         status =
  83             acpi_get_table(table_attr->name, table_attr->instance,
  84                            &table_header);
  85         if (ACPI_FAILURE(status))
  86                 return -ENODEV;
  87
  88         return memory_read_from_buffer(buf, count, &offset,
  89                                         table_header, table_header->length);
  90 }
  91
  92 static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
  93                                  struct acpi_table_header *table_header)
  94 {
  95         struct acpi_table_header *header = NULL;
  96         struct acpi_table_attr *attr = NULL;
  97
  98         memcpy(table_attr->name, table_header->signature, ACPI_NAME_SIZE);
  99
 100         list_for_each_entry(attr, &acpi_table_attr_list, node) {
 101                 if (!memcmp(table_header->signature, attr->name,
 102                             ACPI_NAME_SIZE))
 103                         if (table_attr->instance < attr->instance)
 104                                 table_attr->instance = attr->instance;
 105         }
 106         table_attr->instance++;
 107
 108         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
 109                                          !acpi_get_table(table_header->
 110                                                          signature, 2,
 111                                                          &header)))
 112                 sprintf(table_attr->name + 4, "%d", table_attr->instance);
 113
 114         table_attr->attr.size = 0;
 115         table_attr->attr.read = acpi_table_show;
 116         table_attr->attr.attr.name = table_attr->name;
 117         table_attr->attr.attr.mode = 0444;
 118
 119         return;
 120 }
 121
 122 static int acpi_system_sysfs_init(void)
 123 {
 124         struct acpi_table_attr *table_attr;
 125         struct acpi_table_header *table_header = NULL;
 126         int table_index = 0;
 127         int result;
 128
 129         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
 130         if (!tables_kobj)
 131                 return -ENOMEM;
 132
 133         do {
 134                 result = acpi_get_table_by_index(table_index, &table_header);
 135                 if (!result) {
 136                         table_index++;
 137                         table_attr = NULL;
 138                         table_attr =
 139                             kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
 140                         if (!table_attr)
 141                                 return -ENOMEM;
 142
 143                         acpi_table_attr_init(table_attr, table_header);
 144                         result =
 145                             sysfs_create_bin_file(tables_kobj,
 146                                                   &table_attr->attr);
 147                         if (result) {
 148                                 kfree(table_attr);
 149                                 return result;
 150                         } else
 151                                 list_add_tail(&table_attr->node,
 152                                               &acpi_table_attr_list);
 153                 }
 154         } while (!result);
 155         kobject_uevent(tables_kobj, KOBJ_ADD);
 156
 157         return 0;
 158 }
 159
 160 /*
 161  * Detailed ACPI IRQ counters in /sys/firmware/acpi/interrupts/
 162  * See Documentation/ABI/testing/sysfs-firmware-acpi
 163  */
 164
 165 #define COUNT_GPE 0
 166 #define COUNT_SCI 1     /* acpi_irq_handled */
 167 #define COUNT_ERROR 2   /* other */
 168 #define NUM_COUNTERS_EXTRA 3
 169
 170 struct event_counter {
 171         u32 count;
 172         u32 flags;
 173 };
 174
 175 static struct event_counter *all_counters;
 176 static u32 num_gpes;
 177 static u32 num_counters;
 178 static struct attribute **all_attrs;
 179 static u32 acpi_gpe_count;
 180
 181 static struct attribute_group interrupt_stats_attr_group = {
 182         .name = "interrupts",
 183 };
 184 static struct kobj_attribute *counter_attrs;
 185
 186 static int count_num_gpes(void)
 187 {
 188         int count = 0;
 189         struct acpi_gpe_xrupt_info *gpe_xrupt_info;
 190         struct acpi_gpe_block_info *gpe_block;
 191         acpi_cpu_flags flags;
 192
 193         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 194
 195         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
 196         while (gpe_xrupt_info) {
 197                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
 198                 while (gpe_block) {
 199                         count += gpe_block->register_count *
 200                             ACPI_GPE_REGISTER_WIDTH;
 201                         gpe_block = gpe_block->next;
 202                 }
 203                 gpe_xrupt_info = gpe_xrupt_info->next;
 204         }
 205         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 206
 207         return count;
 208 }
 209
 210 static int get_gpe_device(int index, acpi_handle *handle)
 211 {
 212         struct acpi_gpe_xrupt_info *gpe_xrupt_info;
 213         struct acpi_gpe_block_info *gpe_block;
 214         acpi_cpu_flags flags;
 215         struct acpi_namespace_node *node;
 216
 217         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 218
 219         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
 220         while (gpe_xrupt_info) {
 221                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
 222                 node = gpe_block->node;
 223                 while (gpe_block) {
 224                         index -= gpe_block->register_count *
 225                             ACPI_GPE_REGISTER_WIDTH;
 226                         if (index < 0) {
 227                                 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 228                                 /* return NULL if it's FADT GPE */
 229                                 if (node->type != ACPI_TYPE_DEVICE)
 230                                         *handle = NULL;
 231                                 else
 232                                         *handle = node;
 233                                 return 0;
 234                         }
 235                         node = gpe_block->node;
 236                         gpe_block = gpe_block->next;
 237                 }
 238                 gpe_xrupt_info = gpe_xrupt_info->next;
 239         }
 240         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 241
 242         return -ENODEV;
 243 }
 244
 245 static void delete_gpe_attr_array(void)
 246 {
 247         struct event_counter *tmp = all_counters;
 248
 249         all_counters = NULL;
 250         kfree(tmp);
 251
 252         if (counter_attrs) {
 253                 int i;
 254
 255                 for (i = 0; i < num_gpes; i++)
 256                         kfree(counter_attrs[i].attr.name);
 257
 258                 kfree(counter_attrs);
 259         }
 260         kfree(all_attrs);
 261
 262         return;
 263 }
 264
 265 void acpi_os_gpe_count(u32 gpe_number)
 266 {
 267         acpi_gpe_count++;
 268
 269         if (!all_counters)
 270                 return;
 271
 272         if (gpe_number < num_gpes)
 273                 all_counters[gpe_number].count++;
 274         else
 275                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
 276                                         count++;
 277
 278         return;
 279 }
 280
 281 void acpi_os_fixed_event_count(u32 event_number)
 282 {
 283         if (!all_counters)
 284                 return;
 285
 286         if (event_number < ACPI_NUM_FIXED_EVENTS)
 287                 all_counters[num_gpes + event_number].count++;
 288         else
 289                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
 290                                 count++;
 291
 292         return;
 293 }
 294
 295 static int get_status(u32 index, acpi_event_status *status, acpi_handle *handle)
 296 {
 297         int result = 0;
 298
 299         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 300                 goto end;
 301
 302         if (index < num_gpes) {
 303                 result = get_gpe_device(index, handle);
 304                 if (result) {
 305                         ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
 306                                 "Invalid GPE 0x%x\n", index));
 307                         goto end;
 308                 }
 309                 result = acpi_get_gpe_status(*handle, index,
 310                                                 ACPI_NOT_ISR, status);
 311         } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
 312                 result = acpi_get_event_status(index - num_gpes, status);
 313
 314 end:
 315         return result;
 316 }
 317
 318 static ssize_t counter_show(struct kobject *kobj,
 319         struct kobj_attribute *attr, char *buf)
 320 {
 321         int index = attr - counter_attrs;
 322         int size;
 323         acpi_handle handle;
 324         acpi_event_status status;
 325         int result = 0;
 326
 327         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
 328                 acpi_irq_handled;
 329         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
 330                 acpi_gpe_count;
 331
 332         size = sprintf(buf, "%8d", all_counters[index].count);
 333
 334         /* "gpe_all" or "sci" */
 335         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 336                 goto end;
 337
 338         result = get_status(index, &status, &handle);
 339         if (result)
 340                 goto end;
 341
 342         if (!(status & ACPI_EVENT_FLAG_HANDLE))
 343                 size += sprintf(buf + size, "   invalid");
 344         else if (status & ACPI_EVENT_FLAG_ENABLED)
 345                 size += sprintf(buf + size, "   enabled");
 346         else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
 347                 size += sprintf(buf + size, "   wake_enabled");
 348         else
 349                 size += sprintf(buf + size, "   disabled");
 350
 351 end:
 352         size += sprintf(buf + size, "\n");
 353         return result ? result : size;
 354 }
 355
 356 /*
 357  * counter_set() sets the specified counter.
 358  * setting the total "sci" file to any value clears all counters.
 359  * enable/disable/clear a gpe/fixed event in user space.
 360  */
 361 static ssize_t counter_set(struct kobject *kobj,
 362         struct kobj_attribute *attr, const char *buf, size_t size)
 363 {
 364         int index = attr - counter_attrs;
 365         acpi_event_status status;
 366         acpi_handle handle;
 367         int result = 0;
 368
 369         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
 370                 int i;
 371                 for (i = 0; i < num_counters; ++i)
 372                         all_counters[i].count = 0;
 373                 acpi_gpe_count = 0;
 374                 acpi_irq_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_disable_gpe(handle, index, ACPI_NOT_ISR);
 393                 else if (!strcmp(buf, "enable\n") &&
 394                                 !(status & ACPI_EVENT_FLAG_ENABLED))
 395                         result = acpi_enable_gpe(handle, index, ACPI_NOT_ISR);
 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 = count_num_gpes();
 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_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 static int __init acpi_system_init(void)
 625 {
 626         int result = 0;
 627
 628         if (acpi_disabled)
 629                 return 0;
 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 }
 639
 640 subsys_initcall(acpi_system_init);