| 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 | } |