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 <asm/uaccess.h>
  30
  31 #include <acpi/acpi_drivers.h>
  32
  33 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  34 ACPI_MODULE_NAME("system");
  35 #ifdef MODULE_PARAM_PREFIX
  36 #undef MODULE_PARAM_PREFIX
  37 #endif
  38 #define MODULE_PARAM_PREFIX "acpi."
  39
  40 #define ACPI_SYSTEM_CLASS               "system"
  41 #define ACPI_SYSTEM_DEVICE_NAME         "System"
  42
  43 u32 acpi_irq_handled;
  44
  45 /*
  46  * Make ACPICA version work as module param
  47  */
  48 static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
  49 {
  50         int result;
  51
  52         result = sprintf(buffer, "%x", ACPI_CA_VERSION);
  53
  54         return result;
  55 }
  56
  57 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
  58
  59 /* --------------------------------------------------------------------------
  60                               FS Interface (/sys)
  61    -------------------------------------------------------------------------- */
  62 static LIST_HEAD(acpi_table_attr_list);
  63 static struct kobject *tables_kobj;
  64
  65 struct acpi_table_attr {
  66         struct bin_attribute attr;
  67         char name[8];
  68         int instance;
  69         struct list_head node;
  70 };
  71
  72 static ssize_t acpi_table_show(struct kobject *kobj,
  73                                struct bin_attribute *bin_attr, char *buf,
  74                                loff_t offset, size_t count)
  75 {
  76         struct acpi_table_attr *table_attr =
  77             container_of(bin_attr, struct acpi_table_attr, attr);
  78         struct acpi_table_header *table_header = NULL;
  79         acpi_status status;
  80
  81         status =
  82             acpi_get_table(table_attr->name, table_attr->instance,
  83                            &table_header);
  84         if (ACPI_FAILURE(status))
  85                 return -ENODEV;
  86
  87         return memory_read_from_buffer(buf, count, &offset,
  88                                         table_header, table_header->length);
  89 }
  90
  91 static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
  92                                  struct acpi_table_header *table_header)
  93 {
  94         struct acpi_table_header *header = NULL;
  95         struct acpi_table_attr *attr = NULL;
  96
  97         memcpy(table_attr->name, table_header->signature, ACPI_NAME_SIZE);
  98
  99         list_for_each_entry(attr, &acpi_table_attr_list, node) {
 100                 if (!memcmp(table_header->signature, attr->name,
 101                             ACPI_NAME_SIZE))
 102                         if (table_attr->instance < attr->instance)
 103                                 table_attr->instance = attr->instance;
 104         }
 105         table_attr->instance++;
 106
 107         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
 108                                          !acpi_get_table(table_header->
 109                                                          signature, 2,
 110                                                          &header)))
 111                 sprintf(table_attr->name + 4, "%d", table_attr->instance);
 112
 113         table_attr->attr.size = 0;
 114         table_attr->attr.read = acpi_table_show;
 115         table_attr->attr.attr.name = table_attr->name;
 116         table_attr->attr.attr.mode = 0444;
 117         table_attr->attr.attr.owner = THIS_MODULE;
 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 static u32 *all_counters;
 171 static u32 num_gpes;
 172 static u32 num_counters;
 173 static struct attribute **all_attrs;
 174 static u32 acpi_gpe_count;
 175
 176 static struct attribute_group interrupt_stats_attr_group = {
 177         .name = "interrupts",
 178 };
 179 static struct kobj_attribute *counter_attrs;
 180
 181 static int count_num_gpes(void)
 182 {
 183         int count = 0;
 184         struct acpi_gpe_xrupt_info *gpe_xrupt_info;
 185         struct acpi_gpe_block_info *gpe_block;
 186         acpi_cpu_flags flags;
 187
 188         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 189
 190         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
 191         while (gpe_xrupt_info) {
 192                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
 193                 while (gpe_block) {
 194                         count += gpe_block->register_count *
 195                             ACPI_GPE_REGISTER_WIDTH;
 196                         gpe_block = gpe_block->next;
 197                 }
 198                 gpe_xrupt_info = gpe_xrupt_info->next;
 199         }
 200         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 201
 202         return count;
 203 }
 204
 205 static void delete_gpe_attr_array(void)
 206 {
 207         u32 *tmp = all_counters;
 208
 209         all_counters = NULL;
 210         kfree(tmp);
 211
 212         if (counter_attrs) {
 213                 int i;
 214
 215                 for (i = 0; i < num_gpes; i++)
 216                         kfree(counter_attrs[i].attr.name);
 217
 218                 kfree(counter_attrs);
 219         }
 220         kfree(all_attrs);
 221
 222         return;
 223 }
 224
 225 void acpi_os_gpe_count(u32 gpe_number)
 226 {
 227         acpi_gpe_count++;
 228
 229         if (!all_counters)
 230                 return;
 231
 232         if (gpe_number < num_gpes)
 233                 all_counters[gpe_number]++;
 234         else
 235                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR]++;
 236
 237         return;
 238 }
 239
 240 void acpi_os_fixed_event_count(u32 event_number)
 241 {
 242         if (!all_counters)
 243                 return;
 244
 245         if (event_number < ACPI_NUM_FIXED_EVENTS)
 246                 all_counters[num_gpes + event_number]++;
 247         else
 248                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR]++;
 249
 250         return;
 251 }
 252
 253 static ssize_t counter_show(struct kobject *kobj,
 254         struct kobj_attribute *attr, char *buf)
 255 {
 256         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI] =
 257                 acpi_irq_handled;
 258         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE] =
 259                 acpi_gpe_count;
 260
 261         return sprintf(buf, "%d\n", all_counters[attr - counter_attrs]);
 262 }
 263
 264 /*
 265  * counter_set() sets the specified counter.
 266  * setting the total "sci" file to any value clears all counters.
 267  */
 268 static ssize_t counter_set(struct kobject *kobj,
 269         struct kobj_attribute *attr, const char *buf, size_t size)
 270 {
 271         int index = attr - counter_attrs;
 272
 273         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
 274                 int i;
 275                 for (i = 0; i < num_counters; ++i)
 276                         all_counters[i] = 0;
 277                 acpi_gpe_count = 0;
 278                 acpi_irq_handled = 0;
 279
 280         } else
 281                 all_counters[index] = strtoul(buf, NULL, 0);
 282
 283         return size;
 284 }
 285
 286 void acpi_irq_stats_init(void)
 287 {
 288         int i;
 289
 290         if (all_counters)
 291                 return;
 292
 293         num_gpes = count_num_gpes();
 294         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
 295
 296         all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
 297                         GFP_KERNEL);
 298         if (all_attrs == NULL)
 299                 return;
 300
 301         all_counters = kzalloc(sizeof(u32) * (num_counters), GFP_KERNEL);
 302         if (all_counters == NULL)
 303                 goto fail;
 304
 305         counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
 306                         GFP_KERNEL);
 307         if (counter_attrs == NULL)
 308                 goto fail;
 309
 310         for (i = 0; i < num_counters; ++i) {
 311                 char buffer[12];
 312                 char *name;
 313
 314                 if (i < num_gpes)
 315                         sprintf(buffer, "gpe%02X", i);
 316                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
 317                         sprintf(buffer, "ff_pmtimer");
 318                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
 319                         sprintf(buffer, "ff_gbl_lock");
 320                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
 321                         sprintf(buffer, "ff_pwr_btn");
 322                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
 323                         sprintf(buffer, "ff_slp_btn");
 324                 else if (i == num_gpes + ACPI_EVENT_RTC)
 325                         sprintf(buffer, "ff_rt_clk");
 326                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
 327                         sprintf(buffer, "gpe_all");
 328                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
 329                         sprintf(buffer, "sci");
 330                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
 331                         sprintf(buffer, "error");
 332                 else
 333                         sprintf(buffer, "bug%02X", i);
 334
 335                 name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
 336                 if (name == NULL)
 337                         goto fail;
 338                 strncpy(name, buffer, strlen(buffer) + 1);
 339
 340                 counter_attrs[i].attr.name = name;
 341                 counter_attrs[i].attr.mode = 0644;
 342                 counter_attrs[i].show = counter_show;
 343                 counter_attrs[i].store = counter_set;
 344
 345                 all_attrs[i] = &counter_attrs[i].attr;
 346         }
 347
 348         interrupt_stats_attr_group.attrs = all_attrs;
 349         if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
 350                 return;
 351
 352 fail:
 353         delete_gpe_attr_array();
 354         return;
 355 }
 356
 357 static void __exit interrupt_stats_exit(void)
 358 {
 359         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
 360
 361         delete_gpe_attr_array();
 362
 363         return;
 364 }
 365
 366 /* --------------------------------------------------------------------------
 367                               FS Interface (/proc)
 368    -------------------------------------------------------------------------- */
 369 #ifdef CONFIG_ACPI_PROCFS
 370 #define ACPI_SYSTEM_FILE_INFO           "info"
 371 #define ACPI_SYSTEM_FILE_EVENT          "event"
 372 #define ACPI_SYSTEM_FILE_DSDT           "dsdt"
 373 #define ACPI_SYSTEM_FILE_FADT           "fadt"
 374
 375 static int acpi_system_read_info(struct seq_file *seq, void *offset)
 376 {
 377
 378         seq_printf(seq, "version:                 %x\n", ACPI_CA_VERSION);
 379         return 0;
 380 }
 381
 382 static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
 383 {
 384         return single_open(file, acpi_system_read_info, PDE(inode)->data);
 385 }
 386
 387 static const struct file_operations acpi_system_info_ops = {
 388         .owner = THIS_MODULE,
 389         .open = acpi_system_info_open_fs,
 390         .read = seq_read,
 391         .llseek = seq_lseek,
 392         .release = single_release,
 393 };
 394
 395 static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
 396                                      loff_t *);
 397
 398 static const struct file_operations acpi_system_dsdt_ops = {
 399         .owner = THIS_MODULE,
 400         .read = acpi_system_read_dsdt,
 401 };
 402
 403 static ssize_t
 404 acpi_system_read_dsdt(struct file *file,
 405                       char __user * buffer, size_t count, loff_t * ppos)
 406 {
 407         acpi_status status = AE_OK;
 408         struct acpi_table_header *dsdt = NULL;
 409         ssize_t res;
 410
 411         status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
 412         if (ACPI_FAILURE(status))
 413                 return -ENODEV;
 414
 415         res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);
 416
 417         return res;
 418 }
 419
 420 static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
 421                                      loff_t *);
 422
 423 static const struct file_operations acpi_system_fadt_ops = {
 424         .owner = THIS_MODULE,
 425         .read = acpi_system_read_fadt,
 426 };
 427
 428 static ssize_t
 429 acpi_system_read_fadt(struct file *file,
 430                       char __user * buffer, size_t count, loff_t * ppos)
 431 {
 432         acpi_status status = AE_OK;
 433         struct acpi_table_header *fadt = NULL;
 434         ssize_t res;
 435
 436         status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
 437         if (ACPI_FAILURE(status))
 438                 return -ENODEV;
 439
 440         res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);
 441
 442         return res;
 443 }
 444
 445 static int acpi_system_procfs_init(void)
 446 {
 447         struct proc_dir_entry *entry;
 448         int error = 0;
 449
 450         /* 'info' [R] */
 451         entry = proc_create(ACPI_SYSTEM_FILE_INFO, S_IRUGO, acpi_root_dir,
 452                             &acpi_system_info_ops);
 453         if (!entry)
 454                 goto Error;
 455
 456         /* 'dsdt' [R] */
 457         entry = proc_create(ACPI_SYSTEM_FILE_DSDT, S_IRUSR, acpi_root_dir,
 458                             &acpi_system_dsdt_ops);
 459         if (!entry)
 460                 goto Error;
 461
 462         /* 'fadt' [R] */
 463         entry = proc_create(ACPI_SYSTEM_FILE_FADT, S_IRUSR, acpi_root_dir,
 464                             &acpi_system_fadt_ops);
 465         if (!entry)
 466                 goto Error;
 467
 468       Done:
 469         return error;
 470
 471       Error:
 472         remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
 473         remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
 474         remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
 475
 476         error = -EFAULT;
 477         goto Done;
 478 }
 479 #else
 480 static int acpi_system_procfs_init(void)
 481 {
 482         return 0;
 483 }
 484 #endif
 485
 486 static int __init acpi_system_init(void)
 487 {
 488         int result = 0;
 489
 490         if (acpi_disabled)
 491                 return 0;
 492
 493         result = acpi_system_procfs_init();
 494         if (result)
 495                 return result;
 496
 497         result = acpi_system_sysfs_init();
 498
 499         return result;
 500 }
 501
 502 subsys_initcall(acpi_system_init);