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         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 = 0444;
 127
 128         return;
 129 }
 130
 131 static int acpi_system_sysfs_init(void)
 132 {
 133         struct acpi_table_attr *table_attr;
 134         struct acpi_table_header *table_header = NULL;
 135         int table_index = 0;
 136         int result;
 137
 138         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
 139         if (!tables_kobj)
 140                 return -ENOMEM;
 141
 142         do {
 143                 result = acpi_get_table_by_index(table_index, &table_header);
 144                 if (!result) {
 145                         table_index++;
 146                         table_attr = NULL;
 147                         table_attr =
 148                             kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
 149                         if (!table_attr)
 150                                 return -ENOMEM;
 151
 152                         acpi_table_attr_init(table_attr, table_header);
 153                         result =
 154                             sysfs_create_bin_file(tables_kobj,
 155                                                   &table_attr->attr);
 156                         if (result) {
 157                                 kfree(table_attr);
 158                                 return result;
 159                         } else
 160                                 list_add_tail(&table_attr->node,
 161                                               &acpi_table_attr_list);
 162                 }
 163         } while (!result);
 164         kobject_uevent(tables_kobj, KOBJ_ADD);
 165
 166         return 0;
 167 }
 168
 169 /*
 170  * Detailed ACPI IRQ counters in /sys/firmware/acpi/interrupts/
 171  * See Documentation/ABI/testing/sysfs-firmware-acpi
 172  */
 173
 174 #define COUNT_GPE 0
 175 #define COUNT_SCI 1     /* acpi_irq_handled */
 176 #define COUNT_ERROR 2   /* other */
 177 #define NUM_COUNTERS_EXTRA 3
 178
 179 struct event_counter {
 180         u32 count;
 181         u32 flags;
 182 };
 183
 184 static struct event_counter *all_counters;
 185 static u32 num_gpes;
 186 static u32 num_counters;
 187 static struct attribute **all_attrs;
 188 static u32 acpi_gpe_count;
 189
 190 static struct attribute_group interrupt_stats_attr_group = {
 191         .name = "interrupts",
 192 };
 193 static struct kobj_attribute *counter_attrs;
 194
 195 static void delete_gpe_attr_array(void)
 196 {
 197         struct event_counter *tmp = all_counters;
 198
 199         all_counters = NULL;
 200         kfree(tmp);
 201
 202         if (counter_attrs) {
 203                 int i;
 204
 205                 for (i = 0; i < num_gpes; i++)
 206                         kfree(counter_attrs[i].attr.name);
 207
 208                 kfree(counter_attrs);
 209         }
 210         kfree(all_attrs);
 211
 212         return;
 213 }
 214
 215 void acpi_os_gpe_count(u32 gpe_number)
 216 {
 217         acpi_gpe_count++;
 218
 219         if (!all_counters)
 220                 return;
 221
 222         if (gpe_number < num_gpes)
 223                 all_counters[gpe_number].count++;
 224         else
 225                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
 226                                         count++;
 227
 228         return;
 229 }
 230
 231 void acpi_os_fixed_event_count(u32 event_number)
 232 {
 233         if (!all_counters)
 234                 return;
 235
 236         if (event_number < ACPI_NUM_FIXED_EVENTS)
 237                 all_counters[num_gpes + event_number].count++;
 238         else
 239                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
 240                                 count++;
 241
 242         return;
 243 }
 244
 245 static int get_status(u32 index, acpi_event_status *status, acpi_handle *handle)
 246 {
 247         int result = 0;
 248
 249         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 250                 goto end;
 251
 252         if (index < num_gpes) {
 253                 result = acpi_get_gpe_device(index, handle);
 254                 if (result) {
 255                         ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
 256                                 "Invalid GPE 0x%x\n", index));
 257                         goto end;
 258                 }
 259                 result = acpi_get_gpe_status(*handle, index,
 260                                                 ACPI_NOT_ISR, status);
 261         } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
 262                 result = acpi_get_event_status(index - num_gpes, status);
 263
 264 end:
 265         return result;
 266 }
 267
 268 static ssize_t counter_show(struct kobject *kobj,
 269         struct kobj_attribute *attr, char *buf)
 270 {
 271         int index = attr - counter_attrs;
 272         int size;
 273         acpi_handle handle;
 274         acpi_event_status status;
 275         int result = 0;
 276
 277         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
 278                 acpi_irq_handled;
 279         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
 280                 acpi_gpe_count;
 281
 282         size = sprintf(buf, "%8d", all_counters[index].count);
 283
 284         /* "gpe_all" or "sci" */
 285         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 286                 goto end;
 287
 288         result = get_status(index, &status, &handle);
 289         if (result)
 290                 goto end;
 291
 292         if (!(status & ACPI_EVENT_FLAG_HANDLE))
 293                 size += sprintf(buf + size, "   invalid");
 294         else if (status & ACPI_EVENT_FLAG_ENABLED)
 295                 size += sprintf(buf + size, "   enabled");
 296         else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
 297                 size += sprintf(buf + size, "   wake_enabled");
 298         else
 299                 size += sprintf(buf + size, "   disabled");
 300
 301 end:
 302         size += sprintf(buf + size, "\n");
 303         return result ? result : size;
 304 }
 305
 306 /*
 307  * counter_set() sets the specified counter.
 308  * setting the total "sci" file to any value clears all counters.
 309  * enable/disable/clear a gpe/fixed event in user space.
 310  */
 311 static ssize_t counter_set(struct kobject *kobj,
 312         struct kobj_attribute *attr, const char *buf, size_t size)
 313 {
 314         int index = attr - counter_attrs;
 315         acpi_event_status status;
 316         acpi_handle handle;
 317         int result = 0;
 318
 319         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
 320                 int i;
 321                 for (i = 0; i < num_counters; ++i)
 322                         all_counters[i].count = 0;
 323                 acpi_gpe_count = 0;
 324                 acpi_irq_handled = 0;
 325                 goto end;
 326         }
 327
 328         /* show the event status for both GPEs and Fixed Events */
 329         result = get_status(index, &status, &handle);
 330         if (result)
 331                 goto end;
 332
 333         if (!(status & ACPI_EVENT_FLAG_HANDLE)) {
 334                 printk(KERN_WARNING PREFIX
 335                         "Can not change Invalid GPE/Fixed Event status\n");
 336                 return -EINVAL;
 337         }
 338
 339         if (index < num_gpes) {
 340                 if (!strcmp(buf, "disable\n") &&
 341                                 (status & ACPI_EVENT_FLAG_ENABLED))
 342                         result = acpi_disable_gpe(handle, index);
 343                 else if (!strcmp(buf, "enable\n") &&
 344                                 !(status & ACPI_EVENT_FLAG_ENABLED))
 345                         result = acpi_enable_gpe(handle, index);
 346                 else if (!strcmp(buf, "clear\n") &&
 347                                 (status & ACPI_EVENT_FLAG_SET))
 348                         result = acpi_clear_gpe(handle, index, ACPI_NOT_ISR);
 349                 else
 350                         all_counters[index].count = strtoul(buf, NULL, 0);
 351         } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
 352                 int event = index - num_gpes;
 353                 if (!strcmp(buf, "disable\n") &&
 354                                 (status & ACPI_EVENT_FLAG_ENABLED))
 355                         result = acpi_disable_event(event, ACPI_NOT_ISR);
 356                 else if (!strcmp(buf, "enable\n") &&
 357                                 !(status & ACPI_EVENT_FLAG_ENABLED))
 358                         result = acpi_enable_event(event, ACPI_NOT_ISR);
 359                 else if (!strcmp(buf, "clear\n") &&
 360                                 (status & ACPI_EVENT_FLAG_SET))
 361                         result = acpi_clear_event(event);
 362                 else
 363                         all_counters[index].count = strtoul(buf, NULL, 0);
 364         } else
 365                 all_counters[index].count = strtoul(buf, NULL, 0);
 366
 367         if (ACPI_FAILURE(result))
 368                 result = -EINVAL;
 369 end:
 370         return result ? result : size;
 371 }
 372
 373 void acpi_irq_stats_init(void)
 374 {
 375         int i;
 376
 377         if (all_counters)
 378                 return;
 379
 380         num_gpes = acpi_current_gpe_count;
 381         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
 382
 383         all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
 384                         GFP_KERNEL);
 385         if (all_attrs == NULL)
 386                 return;
 387
 388         all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
 389                                 GFP_KERNEL);
 390         if (all_counters == NULL)
 391                 goto fail;
 392
 393         counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
 394                         GFP_KERNEL);
 395         if (counter_attrs == NULL)
 396                 goto fail;
 397
 398         for (i = 0; i < num_counters; ++i) {
 399                 char buffer[12];
 400                 char *name;
 401
 402                 if (i < num_gpes)
 403                         sprintf(buffer, "gpe%02X", i);
 404                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
 405                         sprintf(buffer, "ff_pmtimer");
 406                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
 407                         sprintf(buffer, "ff_gbl_lock");
 408                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
 409                         sprintf(buffer, "ff_pwr_btn");
 410                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
 411                         sprintf(buffer, "ff_slp_btn");
 412                 else if (i == num_gpes + ACPI_EVENT_RTC)
 413                         sprintf(buffer, "ff_rt_clk");
 414                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
 415                         sprintf(buffer, "gpe_all");
 416                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
 417                         sprintf(buffer, "sci");
 418                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
 419                         sprintf(buffer, "error");
 420                 else
 421                         sprintf(buffer, "bug%02X", i);
 422
 423                 name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
 424                 if (name == NULL)
 425                         goto fail;
 426                 strncpy(name, buffer, strlen(buffer) + 1);
 427
 428                 counter_attrs[i].attr.name = name;
 429                 counter_attrs[i].attr.mode = 0644;
 430                 counter_attrs[i].show = counter_show;
 431                 counter_attrs[i].store = counter_set;
 432
 433                 all_attrs[i] = &counter_attrs[i].attr;
 434         }
 435
 436         interrupt_stats_attr_group.attrs = all_attrs;
 437         if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
 438                 return;
 439
 440 fail:
 441         delete_gpe_attr_array();
 442         return;
 443 }
 444
 445 static void __exit interrupt_stats_exit(void)
 446 {
 447         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
 448
 449         delete_gpe_attr_array();
 450
 451         return;
 452 }
 453
 454 /* --------------------------------------------------------------------------
 455                               FS Interface (/proc)
 456    -------------------------------------------------------------------------- */
 457 #ifdef CONFIG_ACPI_PROCFS
 458 #define ACPI_SYSTEM_FILE_INFO           "info"
 459 #define ACPI_SYSTEM_FILE_EVENT          "event"
 460 #define ACPI_SYSTEM_FILE_DSDT           "dsdt"
 461 #define ACPI_SYSTEM_FILE_FADT           "fadt"
 462
 463 static int acpi_system_read_info(struct seq_file *seq, void *offset)
 464 {
 465
 466         seq_printf(seq, "version:                 %x\n", ACPI_CA_VERSION);
 467         return 0;
 468 }
 469
 470 static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
 471 {
 472         return single_open(file, acpi_system_read_info, PDE(inode)->data);
 473 }
 474
 475 static const struct file_operations acpi_system_info_ops = {
 476         .owner = THIS_MODULE,
 477         .open = acpi_system_info_open_fs,
 478         .read = seq_read,
 479         .llseek = seq_lseek,
 480         .release = single_release,
 481 };
 482
 483 static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
 484                                      loff_t *);
 485
 486 static const struct file_operations acpi_system_dsdt_ops = {
 487         .owner = THIS_MODULE,
 488         .read = acpi_system_read_dsdt,
 489 };
 490
 491 static ssize_t
 492 acpi_system_read_dsdt(struct file *file,
 493                       char __user * buffer, size_t count, loff_t * ppos)
 494 {
 495         acpi_status status = AE_OK;
 496         struct acpi_table_header *dsdt = NULL;
 497         ssize_t res;
 498
 499         status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
 500         if (ACPI_FAILURE(status))
 501                 return -ENODEV;
 502
 503         res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);
 504
 505         return res;
 506 }
 507
 508 static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
 509                                      loff_t *);
 510
 511 static const struct file_operations acpi_system_fadt_ops = {
 512         .owner = THIS_MODULE,
 513         .read = acpi_system_read_fadt,
 514 };
 515
 516 static ssize_t
 517 acpi_system_read_fadt(struct file *file,
 518                       char __user * buffer, size_t count, loff_t * ppos)
 519 {
 520         acpi_status status = AE_OK;
 521         struct acpi_table_header *fadt = NULL;
 522         ssize_t res;
 523
 524         status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
 525         if (ACPI_FAILURE(status))
 526                 return -ENODEV;
 527
 528         res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);
 529
 530         return res;
 531 }
 532
 533 static int acpi_system_procfs_init(void)
 534 {
 535         struct proc_dir_entry *entry;
 536         int error = 0;
 537
 538         /* 'info' [R] */
 539         entry = proc_create(ACPI_SYSTEM_FILE_INFO, S_IRUGO, acpi_root_dir,
 540                             &acpi_system_info_ops);
 541         if (!entry)
 542                 goto Error;
 543
 544         /* 'dsdt' [R] */
 545         entry = proc_create(ACPI_SYSTEM_FILE_DSDT, S_IRUSR, acpi_root_dir,
 546                             &acpi_system_dsdt_ops);
 547         if (!entry)
 548                 goto Error;
 549
 550         /* 'fadt' [R] */
 551         entry = proc_create(ACPI_SYSTEM_FILE_FADT, S_IRUSR, acpi_root_dir,
 552                             &acpi_system_fadt_ops);
 553         if (!entry)
 554                 goto Error;
 555
 556       Done:
 557         return error;
 558
 559       Error:
 560         remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
 561         remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
 562         remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
 563
 564         error = -EFAULT;
 565         goto Done;
 566 }
 567 #else
 568 static int acpi_system_procfs_init(void)
 569 {
 570         return 0;
 571 }
 572 #endif
 573
 574 static int __init acpi_system_init(void)
 575 {
 576         int result = 0;
 577
 578         if (acpi_disabled)
 579                 return 0;
 580
 581         result = acpi_system_procfs_init();
 582         if (result)
 583                 return result;
 584
 585         result = acpi_system_sysfs_init();
 586
 587         return result;
 588 }
 589
 590 subsys_initcall(acpi_system_init);