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   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
  37 #define ACPI_SYSTEM_CLASS               "system"
  38 #define ACPI_SYSTEM_DEVICE_NAME         "System"
  39
  40 u32 acpi_irq_handled;
  41
  42 /*
  43  * Make ACPICA version work as module param
  44  */
  45 static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
  46 {
  47         int result;
  48
  49         result = sprintf(buffer, "%x", ACPI_CA_VERSION);
  50
  51         return result;
  52 }
  53
  54 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
  55
  56 /* --------------------------------------------------------------------------
  57                               FS Interface (/sys)
  58    -------------------------------------------------------------------------- */
  59 static LIST_HEAD(acpi_table_attr_list);
  60 static struct kobject *tables_kobj;
  61
  62 struct acpi_table_attr {
  63         struct bin_attribute attr;
  64         char name[8];
  65         int instance;
  66         struct list_head node;
  67 };
  68
  69 static ssize_t acpi_table_show(struct kobject *kobj,
  70                                struct bin_attribute *bin_attr, char *buf,
  71                                loff_t offset, size_t count)
  72 {
  73         struct acpi_table_attr *table_attr =
  74             container_of(bin_attr, struct acpi_table_attr, attr);
  75         struct acpi_table_header *table_header = NULL;
  76         acpi_status status;
  77         char name[ACPI_NAME_SIZE];
  78
  79         if (strncmp(table_attr->name, "NULL", 4))
  80                 memcpy(name, table_attr->name, ACPI_NAME_SIZE);
  81         else
  82                 memcpy(name, "\0\0\0\0", 4);
  83
  84         status =
  85             acpi_get_table(name, table_attr->instance,
  86                            &table_header);
  87         if (ACPI_FAILURE(status))
  88                 return -ENODEV;
  89
  90         return memory_read_from_buffer(buf, count, &offset,
  91                                         table_header, table_header->length);
  92 }
  93
  94 static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
  95                                  struct acpi_table_header *table_header)
  96 {
  97         struct acpi_table_header *header = NULL;
  98         struct acpi_table_attr *attr = NULL;
  99
 100         if (table_header->signature[0] != '\0')
 101                 memcpy(table_attr->name, table_header->signature,
 102                         ACPI_NAME_SIZE);
 103         else
 104                 memcpy(table_attr->name, "NULL", 4);
 105
 106         list_for_each_entry(attr, &acpi_table_attr_list, node) {
 107                 if (!memcmp(table_attr->name, attr->name, ACPI_NAME_SIZE))
 108                         if (table_attr->instance < attr->instance)
 109                                 table_attr->instance = attr->instance;
 110         }
 111         table_attr->instance++;
 112
 113         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
 114                                         !acpi_get_table
 115                                         (table_header->signature, 2, &header)))
 116                 sprintf(table_attr->name + ACPI_NAME_SIZE, "%d",
 117                         table_attr->instance);
 118
 119         table_attr->attr.size = 0;
 120         table_attr->attr.read = acpi_table_show;
 121         table_attr->attr.attr.name = table_attr->name;
 122         table_attr->attr.attr.mode = 0444;
 123
 124         return;
 125 }
 126
 127 static int acpi_system_sysfs_init(void)
 128 {
 129         struct acpi_table_attr *table_attr;
 130         struct acpi_table_header *table_header = NULL;
 131         int table_index = 0;
 132         int result;
 133
 134         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
 135         if (!tables_kobj)
 136                 return -ENOMEM;
 137
 138         do {
 139                 result = acpi_get_table_by_index(table_index, &table_header);
 140                 if (!result) {
 141                         table_index++;
 142                         table_attr = NULL;
 143                         table_attr =
 144                             kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
 145                         if (!table_attr)
 146                                 return -ENOMEM;
 147
 148                         acpi_table_attr_init(table_attr, table_header);
 149                         result =
 150                             sysfs_create_bin_file(tables_kobj,
 151                                                   &table_attr->attr);
 152                         if (result) {
 153                                 kfree(table_attr);
 154                                 return result;
 155                         } else
 156                                 list_add_tail(&table_attr->node,
 157                                               &acpi_table_attr_list);
 158                 }
 159         } while (!result);
 160         kobject_uevent(tables_kobj, KOBJ_ADD);
 161
 162         return 0;
 163 }
 164
 165 /*
 166  * Detailed ACPI IRQ counters in /sys/firmware/acpi/interrupts/
 167  * See Documentation/ABI/testing/sysfs-firmware-acpi
 168  */
 169
 170 #define COUNT_GPE 0
 171 #define COUNT_SCI 1     /* acpi_irq_handled */
 172 #define COUNT_ERROR 2   /* other */
 173 #define NUM_COUNTERS_EXTRA 3
 174
 175 struct event_counter {
 176         u32 count;
 177         u32 flags;
 178 };
 179
 180 static struct event_counter *all_counters;
 181 static u32 num_gpes;
 182 static u32 num_counters;
 183 static struct attribute **all_attrs;
 184 static u32 acpi_gpe_count;
 185
 186 static struct attribute_group interrupt_stats_attr_group = {
 187         .name = "interrupts",
 188 };
 189 static struct kobj_attribute *counter_attrs;
 190
 191 static void delete_gpe_attr_array(void)
 192 {
 193         struct event_counter *tmp = all_counters;
 194
 195         all_counters = NULL;
 196         kfree(tmp);
 197
 198         if (counter_attrs) {
 199                 int i;
 200
 201                 for (i = 0; i < num_gpes; i++)
 202                         kfree(counter_attrs[i].attr.name);
 203
 204                 kfree(counter_attrs);
 205         }
 206         kfree(all_attrs);
 207
 208         return;
 209 }
 210
 211 void acpi_os_gpe_count(u32 gpe_number)
 212 {
 213         acpi_gpe_count++;
 214
 215         if (!all_counters)
 216                 return;
 217
 218         if (gpe_number < num_gpes)
 219                 all_counters[gpe_number].count++;
 220         else
 221                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
 222                                         count++;
 223
 224         return;
 225 }
 226
 227 void acpi_os_fixed_event_count(u32 event_number)
 228 {
 229         if (!all_counters)
 230                 return;
 231
 232         if (event_number < ACPI_NUM_FIXED_EVENTS)
 233                 all_counters[num_gpes + event_number].count++;
 234         else
 235                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
 236                                 count++;
 237
 238         return;
 239 }
 240
 241 static int get_status(u32 index, acpi_event_status *status, acpi_handle *handle)
 242 {
 243         int result = 0;
 244
 245         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 246                 goto end;
 247
 248         if (index < num_gpes) {
 249                 result = acpi_get_gpe_device(index, handle);
 250                 if (result) {
 251                         ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
 252                                 "Invalid GPE 0x%x\n", index));
 253                         goto end;
 254                 }
 255                 result = acpi_get_gpe_status(*handle, index,
 256                                                 ACPI_NOT_ISR, status);
 257         } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
 258                 result = acpi_get_event_status(index - num_gpes, status);
 259
 260 end:
 261         return result;
 262 }
 263
 264 static ssize_t counter_show(struct kobject *kobj,
 265         struct kobj_attribute *attr, char *buf)
 266 {
 267         int index = attr - counter_attrs;
 268         int size;
 269         acpi_handle handle;
 270         acpi_event_status status;
 271         int result = 0;
 272
 273         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
 274                 acpi_irq_handled;
 275         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
 276                 acpi_gpe_count;
 277
 278         size = sprintf(buf, "%8d", all_counters[index].count);
 279
 280         /* "gpe_all" or "sci" */
 281         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 282                 goto end;
 283
 284         result = get_status(index, &status, &handle);
 285         if (result)
 286                 goto end;
 287
 288         if (!(status & ACPI_EVENT_FLAG_HANDLE))
 289                 size += sprintf(buf + size, "   invalid");
 290         else if (status & ACPI_EVENT_FLAG_ENABLED)
 291                 size += sprintf(buf + size, "   enabled");
 292         else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
 293                 size += sprintf(buf + size, "   wake_enabled");
 294         else
 295                 size += sprintf(buf + size, "   disabled");
 296
 297 end:
 298         size += sprintf(buf + size, "\n");
 299         return result ? result : size;
 300 }
 301
 302 /*
 303  * counter_set() sets the specified counter.
 304  * setting the total "sci" file to any value clears all counters.
 305  * enable/disable/clear a gpe/fixed event in user space.
 306  */
 307 static ssize_t counter_set(struct kobject *kobj,
 308         struct kobj_attribute *attr, const char *buf, size_t size)
 309 {
 310         int index = attr - counter_attrs;
 311         acpi_event_status status;
 312         acpi_handle handle;
 313         int result = 0;
 314
 315         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
 316                 int i;
 317                 for (i = 0; i < num_counters; ++i)
 318                         all_counters[i].count = 0;
 319                 acpi_gpe_count = 0;
 320                 acpi_irq_handled = 0;
 321                 goto end;
 322         }
 323
 324         /* show the event status for both GPEs and Fixed Events */
 325         result = get_status(index, &status, &handle);
 326         if (result)
 327                 goto end;
 328
 329         if (!(status & ACPI_EVENT_FLAG_HANDLE)) {
 330                 printk(KERN_WARNING PREFIX
 331                         "Can not change Invalid GPE/Fixed Event status\n");
 332                 return -EINVAL;
 333         }
 334
 335         if (index < num_gpes) {
 336                 if (!strcmp(buf, "disable\n") &&
 337                                 (status & ACPI_EVENT_FLAG_ENABLED))
 338                         result = acpi_disable_gpe(handle, index);
 339                 else if (!strcmp(buf, "enable\n") &&
 340                                 !(status & ACPI_EVENT_FLAG_ENABLED))
 341                         result = acpi_enable_gpe(handle, index);
 342                 else if (!strcmp(buf, "clear\n") &&
 343                                 (status & ACPI_EVENT_FLAG_SET))
 344                         result = acpi_clear_gpe(handle, index, ACPI_NOT_ISR);
 345                 else
 346                         all_counters[index].count = strtoul(buf, NULL, 0);
 347         } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
 348                 int event = index - num_gpes;
 349                 if (!strcmp(buf, "disable\n") &&
 350                                 (status & ACPI_EVENT_FLAG_ENABLED))
 351                         result = acpi_disable_event(event, ACPI_NOT_ISR);
 352                 else if (!strcmp(buf, "enable\n") &&
 353                                 !(status & ACPI_EVENT_FLAG_ENABLED))
 354                         result = acpi_enable_event(event, ACPI_NOT_ISR);
 355                 else if (!strcmp(buf, "clear\n") &&
 356                                 (status & ACPI_EVENT_FLAG_SET))
 357                         result = acpi_clear_event(event);
 358                 else
 359                         all_counters[index].count = strtoul(buf, NULL, 0);
 360         } else
 361                 all_counters[index].count = strtoul(buf, NULL, 0);
 362
 363         if (ACPI_FAILURE(result))
 364                 result = -EINVAL;
 365 end:
 366         return result ? result : size;
 367 }
 368
 369 void acpi_irq_stats_init(void)
 370 {
 371         int i;
 372
 373         if (all_counters)
 374                 return;
 375
 376         num_gpes = acpi_current_gpe_count;
 377         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
 378
 379         all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
 380                         GFP_KERNEL);
 381         if (all_attrs == NULL)
 382                 return;
 383
 384         all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
 385                                 GFP_KERNEL);
 386         if (all_counters == NULL)
 387                 goto fail;
 388
 389         counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
 390                         GFP_KERNEL);
 391         if (counter_attrs == NULL)
 392                 goto fail;
 393
 394         for (i = 0; i < num_counters; ++i) {
 395                 char buffer[12];
 396                 char *name;
 397
 398                 if (i < num_gpes)
 399                         sprintf(buffer, "gpe%02X", i);
 400                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
 401                         sprintf(buffer, "ff_pmtimer");
 402                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
 403                         sprintf(buffer, "ff_gbl_lock");
 404                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
 405                         sprintf(buffer, "ff_pwr_btn");
 406                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
 407                         sprintf(buffer, "ff_slp_btn");
 408                 else if (i == num_gpes + ACPI_EVENT_RTC)
 409                         sprintf(buffer, "ff_rt_clk");
 410                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
 411                         sprintf(buffer, "gpe_all");
 412                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
 413                         sprintf(buffer, "sci");
 414                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
 415                         sprintf(buffer, "error");
 416                 else
 417                         sprintf(buffer, "bug%02X", i);
 418
 419                 name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
 420                 if (name == NULL)
 421                         goto fail;
 422                 strncpy(name, buffer, strlen(buffer) + 1);
 423
 424                 counter_attrs[i].attr.name = name;
 425                 counter_attrs[i].attr.mode = 0644;
 426                 counter_attrs[i].show = counter_show;
 427                 counter_attrs[i].store = counter_set;
 428
 429                 all_attrs[i] = &counter_attrs[i].attr;
 430         }
 431
 432         interrupt_stats_attr_group.attrs = all_attrs;
 433         if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
 434                 return;
 435
 436 fail:
 437         delete_gpe_attr_array();
 438         return;
 439 }
 440
 441 static void __exit interrupt_stats_exit(void)
 442 {
 443         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
 444
 445         delete_gpe_attr_array();
 446
 447         return;
 448 }
 449
 450 /* --------------------------------------------------------------------------
 451                               FS Interface (/proc)
 452    -------------------------------------------------------------------------- */
 453 #ifdef CONFIG_ACPI_PROCFS
 454 #define ACPI_SYSTEM_FILE_INFO           "info"
 455 #define ACPI_SYSTEM_FILE_EVENT          "event"
 456 #define ACPI_SYSTEM_FILE_DSDT           "dsdt"
 457 #define ACPI_SYSTEM_FILE_FADT           "fadt"
 458
 459 static int acpi_system_read_info(struct seq_file *seq, void *offset)
 460 {
 461
 462         seq_printf(seq, "version:                 %x\n", ACPI_CA_VERSION);
 463         return 0;
 464 }
 465
 466 static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
 467 {
 468         return single_open(file, acpi_system_read_info, PDE(inode)->data);
 469 }
 470
 471 static const struct file_operations acpi_system_info_ops = {
 472         .owner = THIS_MODULE,
 473         .open = acpi_system_info_open_fs,
 474         .read = seq_read,
 475         .llseek = seq_lseek,
 476         .release = single_release,
 477 };
 478
 479 static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
 480                                      loff_t *);
 481
 482 static const struct file_operations acpi_system_dsdt_ops = {
 483         .owner = THIS_MODULE,
 484         .read = acpi_system_read_dsdt,
 485 };
 486
 487 static ssize_t
 488 acpi_system_read_dsdt(struct file *file,
 489                       char __user * buffer, size_t count, loff_t * ppos)
 490 {
 491         acpi_status status = AE_OK;
 492         struct acpi_table_header *dsdt = NULL;
 493         ssize_t res;
 494
 495         status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
 496         if (ACPI_FAILURE(status))
 497                 return -ENODEV;
 498
 499         res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);
 500
 501         return res;
 502 }
 503
 504 static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
 505                                      loff_t *);
 506
 507 static const struct file_operations acpi_system_fadt_ops = {
 508         .owner = THIS_MODULE,
 509         .read = acpi_system_read_fadt,
 510 };
 511
 512 static ssize_t
 513 acpi_system_read_fadt(struct file *file,
 514                       char __user * buffer, size_t count, loff_t * ppos)
 515 {
 516         acpi_status status = AE_OK;
 517         struct acpi_table_header *fadt = NULL;
 518         ssize_t res;
 519
 520         status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
 521         if (ACPI_FAILURE(status))
 522                 return -ENODEV;
 523
 524         res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);
 525
 526         return res;
 527 }
 528
 529 static int acpi_system_procfs_init(void)
 530 {
 531         struct proc_dir_entry *entry;
 532         int error = 0;
 533
 534         /* 'info' [R] */
 535         entry = proc_create(ACPI_SYSTEM_FILE_INFO, S_IRUGO, acpi_root_dir,
 536                             &acpi_system_info_ops);
 537         if (!entry)
 538                 goto Error;
 539
 540         /* 'dsdt' [R] */
 541         entry = proc_create(ACPI_SYSTEM_FILE_DSDT, S_IRUSR, acpi_root_dir,
 542                             &acpi_system_dsdt_ops);
 543         if (!entry)
 544                 goto Error;
 545
 546         /* 'fadt' [R] */
 547         entry = proc_create(ACPI_SYSTEM_FILE_FADT, S_IRUSR, acpi_root_dir,
 548                             &acpi_system_fadt_ops);
 549         if (!entry)
 550                 goto Error;
 551
 552       Done:
 553         return error;
 554
 555       Error:
 556         remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
 557         remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
 558         remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
 559
 560         error = -EFAULT;
 561         goto Done;
 562 }
 563 #else
 564 static int acpi_system_procfs_init(void)
 565 {
 566         return 0;
 567 }
 568 #endif
 569
 570 static int __init acpi_system_init(void)
 571 {
 572         int result = 0;
 573
 574         if (acpi_disabled)
 575                 return 0;
 576
 577         result = acpi_system_procfs_init();
 578         if (result)
 579                 return result;
 580
 581         result = acpi_system_sysfs_init();
 582
 583         return result;
 584 }
 585
 586 subsys_initcall(acpi_system_init);