1 /* 2 * acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $) 3 * 4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com> 5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 7 * 8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or (at 13 * your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, but 16 * WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License along 21 * with this program; if not, write to the Free Software Foundation, Inc., 22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 23 * 24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 25 */ 26 27 #include <linux/kernel.h> 28 #include <linux/module.h> 29 #include <linux/init.h> 30 #include <linux/types.h> 31 #include <linux/delay.h> 32 #include <linux/proc_fs.h> 33 #include <linux/seq_file.h> 34 #include <asm/io.h> 35 #include <acpi/acpi_bus.h> 36 #include <acpi/acpi_drivers.h> 37 #include <acpi/actypes.h> 38 39 #define _COMPONENT ACPI_EC_COMPONENT 40 ACPI_MODULE_NAME ("acpi_ec") 41 42 #define ACPI_EC_COMPONENT 0x00100000 43 #define ACPI_EC_CLASS "embedded_controller" 44 #define ACPI_EC_HID "PNP0C09" 45 #define ACPI_EC_DRIVER_NAME "ACPI Embedded Controller Driver" 46 #define ACPI_EC_DEVICE_NAME "Embedded Controller" 47 #define ACPI_EC_FILE_INFO "info" 48 49 50 #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ 51 #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ 52 #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ 53 54 #define ACPI_EC_EVENT_OBF 0x01 /* Output buffer full */ 55 #define ACPI_EC_EVENT_IBE 0x02 /* Input buffer empty */ 56 57 #define ACPI_EC_UDELAY 100 /* Poll @ 100us increments */ 58 #define ACPI_EC_UDELAY_COUNT 1000 /* Wait 10ms max. during EC ops */ 59 #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ 60 61 #define ACPI_EC_COMMAND_READ 0x80 62 #define ACPI_EC_COMMAND_WRITE 0x81 63 #define ACPI_EC_COMMAND_QUERY 0x84 64 65 static int acpi_ec_add (struct acpi_device *device); 66 static int acpi_ec_remove (struct acpi_device *device, int type); 67 static int acpi_ec_start (struct acpi_device *device); 68 static int acpi_ec_stop (struct acpi_device *device, int type); 69 70 static struct acpi_driver acpi_ec_driver = { 71 .name = ACPI_EC_DRIVER_NAME, 72 .class = ACPI_EC_CLASS, 73 .ids = ACPI_EC_HID, 74 .ops = { 75 .add = acpi_ec_add, 76 .remove = acpi_ec_remove, 77 .start = acpi_ec_start, 78 .stop = acpi_ec_stop, 79 }, 80 }; 81 82 struct acpi_ec { 83 acpi_handle handle; 84 unsigned long uid; 85 unsigned long gpe_bit; 86 struct acpi_generic_address status_addr; 87 struct acpi_generic_address command_addr; 88 struct acpi_generic_address data_addr; 89 unsigned long global_lock; 90 spinlock_t lock; 91 }; 92 93 /* If we find an EC via the ECDT, we need to keep a ptr to its context */ 94 static struct acpi_ec *ec_ecdt; 95 96 /* External interfaces use first EC only, so remember */ 97 static struct acpi_device *first_ec; 98 99 /* -------------------------------------------------------------------------- 100 Transaction Management 101 -------------------------------------------------------------------------- */ 102 103 static int 104 acpi_ec_wait ( 105 struct acpi_ec *ec, 106 u8 event) 107 { 108 u32 acpi_ec_status = 0; 109 u32 i = ACPI_EC_UDELAY_COUNT; 110 111 if (!ec) 112 return -EINVAL; 113 114 /* Poll the EC status register waiting for the event to occur. */ 115 switch (event) { 116 case ACPI_EC_EVENT_OBF: 117 do { 118 acpi_hw_low_level_read(8, &acpi_ec_status, &ec->status_addr); 119 if (acpi_ec_status & ACPI_EC_FLAG_OBF) 120 return 0; 121 udelay(ACPI_EC_UDELAY); 122 } while (--i>0); 123 break; 124 case ACPI_EC_EVENT_IBE: 125 do { 126 acpi_hw_low_level_read(8, &acpi_ec_status, &ec->status_addr); 127 if (!(acpi_ec_status & ACPI_EC_FLAG_IBF)) 128 return 0; 129 udelay(ACPI_EC_UDELAY); 130 } while (--i>0); 131 break; 132 default: 133 return -EINVAL; 134 } 135 136 return -ETIME; 137 } 138 139 140 static int 141 acpi_ec_read ( 142 struct acpi_ec *ec, 143 u8 address, 144 u32 *data) 145 { 146 acpi_status status = AE_OK; 147 int result = 0; 148 unsigned long flags = 0; 149 u32 glk = 0; 150 151 ACPI_FUNCTION_TRACE("acpi_ec_read"); 152 153 if (!ec || !data) 154 return_VALUE(-EINVAL); 155 156 *data = 0; 157 158 if (ec->global_lock) { 159 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); 160 if (ACPI_FAILURE(status)) 161 return_VALUE(-ENODEV); 162 } 163 164 spin_lock_irqsave(&ec->lock, flags); 165 166 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, &ec->command_addr); 167 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); 168 if (result) 169 goto end; 170 171 acpi_hw_low_level_write(8, address, &ec->data_addr); 172 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); 173 if (result) 174 goto end; 175 176 177 acpi_hw_low_level_read(8, data, &ec->data_addr); 178 179 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n", 180 *data, address)); 181 182 end: 183 spin_unlock_irqrestore(&ec->lock, flags); 184 185 if (ec->global_lock) 186 acpi_release_global_lock(glk); 187 188 return_VALUE(result); 189 } 190 191 192 static int 193 acpi_ec_write ( 194 struct acpi_ec *ec, 195 u8 address, 196 u8 data) 197 { 198 int result = 0; 199 acpi_status status = AE_OK; 200 unsigned long flags = 0; 201 u32 glk = 0; 202 203 ACPI_FUNCTION_TRACE("acpi_ec_write"); 204 205 if (!ec) 206 return_VALUE(-EINVAL); 207 208 if (ec->global_lock) { 209 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); 210 if (ACPI_FAILURE(status)) 211 return_VALUE(-ENODEV); 212 } 213 214 spin_lock_irqsave(&ec->lock, flags); 215 216 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, &ec->command_addr); 217 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); 218 if (result) 219 goto end; 220 221 acpi_hw_low_level_write(8, address, &ec->data_addr); 222 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); 223 if (result) 224 goto end; 225 226 acpi_hw_low_level_write(8, data, &ec->data_addr); 227 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); 228 if (result) 229 goto end; 230 231 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n", 232 data, address)); 233 234 end: 235 spin_unlock_irqrestore(&ec->lock, flags); 236 237 if (ec->global_lock) 238 acpi_release_global_lock(glk); 239 240 return_VALUE(result); 241 } 242 243 /* 244 * Externally callable EC access functions. For now, assume 1 EC only 245 */ 246 int 247 ec_read(u8 addr, u8 *val) 248 { 249 struct acpi_ec *ec; 250 int err; 251 u32 temp_data; 252 253 if (!first_ec) 254 return -ENODEV; 255 256 ec = acpi_driver_data(first_ec); 257 258 err = acpi_ec_read(ec, addr, &temp_data); 259 260 if (!err) { 261 *val = temp_data; 262 return 0; 263 } 264 else 265 return err; 266 } 267 EXPORT_SYMBOL(ec_read); 268 269 int 270 ec_write(u8 addr, u8 val) 271 { 272 struct acpi_ec *ec; 273 int err; 274 275 if (!first_ec) 276 return -ENODEV; 277 278 ec = acpi_driver_data(first_ec); 279 280 err = acpi_ec_write(ec, addr, val); 281 282 return err; 283 } 284 EXPORT_SYMBOL(ec_write); 285 286 287 static int 288 acpi_ec_query ( 289 struct acpi_ec *ec, 290 u32 *data) 291 { 292 int result = 0; 293 acpi_status status = AE_OK; 294 unsigned long flags = 0; 295 u32 glk = 0; 296 297 ACPI_FUNCTION_TRACE("acpi_ec_query"); 298 299 if (!ec || !data) 300 return_VALUE(-EINVAL); 301 302 *data = 0; 303 304 if (ec->global_lock) { 305 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); 306 if (ACPI_FAILURE(status)) 307 return_VALUE(-ENODEV); 308 } 309 310 /* 311 * Query the EC to find out which _Qxx method we need to evaluate. 312 * Note that successful completion of the query causes the ACPI_EC_SCI 313 * bit to be cleared (and thus clearing the interrupt source). 314 */ 315 spin_lock_irqsave(&ec->lock, flags); 316 317 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, &ec->command_addr); 318 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); 319 if (result) 320 goto end; 321 322 acpi_hw_low_level_read(8, data, &ec->data_addr); 323 if (!*data) 324 result = -ENODATA; 325 326 end: 327 spin_unlock_irqrestore(&ec->lock, flags); 328 329 if (ec->global_lock) 330 acpi_release_global_lock(glk); 331 332 return_VALUE(result); 333 } 334 335 336 /* -------------------------------------------------------------------------- 337 Event Management 338 -------------------------------------------------------------------------- */ 339 340 struct acpi_ec_query_data { 341 acpi_handle handle; 342 u8 data; 343 }; 344 345 static void 346 acpi_ec_gpe_query ( 347 void *ec_cxt) 348 { 349 struct acpi_ec *ec = (struct acpi_ec *) ec_cxt; 350 u32 value = 0; 351 unsigned long flags = 0; 352 static char object_name[5] = {'_','Q','0','0','\0'}; 353 const char hex[] = {'0','1','2','3','4','5','6','7', 354 '8','9','A','B','C','D','E','F'}; 355 356 ACPI_FUNCTION_TRACE("acpi_ec_gpe_query"); 357 358 if (!ec_cxt) 359 goto end; 360 361 spin_lock_irqsave(&ec->lock, flags); 362 acpi_hw_low_level_read(8, &value, &ec->command_addr); 363 spin_unlock_irqrestore(&ec->lock, flags); 364 365 /* TBD: Implement asynch events! 366 * NOTE: All we care about are EC-SCI's. Other EC events are 367 * handled via polling (yuck!). This is because some systems 368 * treat EC-SCIs as level (versus EDGE!) triggered, preventing 369 * a purely interrupt-driven approach (grumble, grumble). 370 */ 371 if (!(value & ACPI_EC_FLAG_SCI)) 372 goto end; 373 374 if (acpi_ec_query(ec, &value)) 375 goto end; 376 377 object_name[2] = hex[((value >> 4) & 0x0F)]; 378 object_name[3] = hex[(value & 0x0F)]; 379 380 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name)); 381 382 acpi_evaluate_object(ec->handle, object_name, NULL, NULL); 383 384 end: 385 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); 386 } 387 388 static u32 389 acpi_ec_gpe_handler ( 390 void *data) 391 { 392 acpi_status status = AE_OK; 393 struct acpi_ec *ec = (struct acpi_ec *) data; 394 395 if (!ec) 396 return ACPI_INTERRUPT_NOT_HANDLED; 397 398 acpi_disable_gpe(NULL, ec->gpe_bit, ACPI_ISR); 399 400 status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE, 401 acpi_ec_gpe_query, ec); 402 403 if (status == AE_OK) 404 return ACPI_INTERRUPT_HANDLED; 405 else 406 return ACPI_INTERRUPT_NOT_HANDLED; 407 } 408 409 /* -------------------------------------------------------------------------- 410 Address Space Management 411 -------------------------------------------------------------------------- */ 412 413 static acpi_status 414 acpi_ec_space_setup ( 415 acpi_handle region_handle, 416 u32 function, 417 void *handler_context, 418 void **return_context) 419 { 420 /* 421 * The EC object is in the handler context and is needed 422 * when calling the acpi_ec_space_handler. 423 */ 424 if(function == ACPI_REGION_DEACTIVATE) 425 *return_context = NULL; 426 else 427 *return_context = handler_context; 428 429 return AE_OK; 430 } 431 432 433 static acpi_status 434 acpi_ec_space_handler ( 435 u32 function, 436 acpi_physical_address address, 437 u32 bit_width, 438 acpi_integer *value, 439 void *handler_context, 440 void *region_context) 441 { 442 int result = 0; 443 struct acpi_ec *ec = NULL; 444 u32 temp = 0; 445 acpi_integer f_v = 0; 446 int i = 0; 447 448 ACPI_FUNCTION_TRACE("acpi_ec_space_handler"); 449 450 if ((address > 0xFF) || !value || !handler_context) 451 return_VALUE(AE_BAD_PARAMETER); 452 453 if(bit_width != 8) { 454 printk(KERN_WARNING PREFIX "acpi_ec_space_handler: bit_width should be 8\n"); 455 if (acpi_strict) 456 return_VALUE(AE_BAD_PARAMETER); 457 } 458 459 ec = (struct acpi_ec *) handler_context; 460 461 next_byte: 462 switch (function) { 463 case ACPI_READ: 464 result = acpi_ec_read(ec, (u8) address, &temp); 465 *value = (acpi_integer) temp; 466 break; 467 case ACPI_WRITE: 468 result = acpi_ec_write(ec, (u8) address, (u8) *value); 469 break; 470 default: 471 result = -EINVAL; 472 goto out; 473 break; 474 } 475 476 bit_width -= 8; 477 if(bit_width){ 478 479 if(function == ACPI_READ) 480 f_v |= (acpi_integer) (*value) << 8*i; 481 if(function == ACPI_WRITE) 482 (*value) >>=8; 483 i++; 484 goto next_byte; 485 } 486 487 488 if(function == ACPI_READ){ 489 f_v |= (acpi_integer) (*value) << 8*i; 490 *value = f_v; 491 } 492 493 494 out: 495 switch (result) { 496 case -EINVAL: 497 return_VALUE(AE_BAD_PARAMETER); 498 break; 499 case -ENODEV: 500 return_VALUE(AE_NOT_FOUND); 501 break; 502 case -ETIME: 503 return_VALUE(AE_TIME); 504 break; 505 default: 506 return_VALUE(AE_OK); 507 } 508 509 510 } 511 512 513 /* -------------------------------------------------------------------------- 514 FS Interface (/proc) 515 -------------------------------------------------------------------------- */ 516 517 static struct proc_dir_entry *acpi_ec_dir; 518 519 520 static int 521 acpi_ec_read_info (struct seq_file *seq, void *offset) 522 { 523 struct acpi_ec *ec = (struct acpi_ec *) seq->private; 524 525 ACPI_FUNCTION_TRACE("acpi_ec_read_info"); 526 527 if (!ec) 528 goto end; 529 530 seq_printf(seq, "gpe bit: 0x%02x\n", 531 (u32) ec->gpe_bit); 532 seq_printf(seq, "ports: 0x%02x, 0x%02x\n", 533 (u32) ec->status_addr.address, (u32) ec->data_addr.address); 534 seq_printf(seq, "use global lock: %s\n", 535 ec->global_lock?"yes":"no"); 536 537 end: 538 return_VALUE(0); 539 } 540 541 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) 542 { 543 return single_open(file, acpi_ec_read_info, PDE(inode)->data); 544 } 545 546 static struct file_operations acpi_ec_info_ops = { 547 .open = acpi_ec_info_open_fs, 548 .read = seq_read, 549 .llseek = seq_lseek, 550 .release = single_release, 551 .owner = THIS_MODULE, 552 }; 553 554 static int 555 acpi_ec_add_fs ( 556 struct acpi_device *device) 557 { 558 struct proc_dir_entry *entry = NULL; 559 560 ACPI_FUNCTION_TRACE("acpi_ec_add_fs"); 561 562 if (!acpi_device_dir(device)) { 563 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 564 acpi_ec_dir); 565 if (!acpi_device_dir(device)) 566 return_VALUE(-ENODEV); 567 } 568 569 entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, 570 acpi_device_dir(device)); 571 if (!entry) 572 ACPI_DEBUG_PRINT((ACPI_DB_WARN, 573 "Unable to create '%s' fs entry\n", 574 ACPI_EC_FILE_INFO)); 575 else { 576 entry->proc_fops = &acpi_ec_info_ops; 577 entry->data = acpi_driver_data(device); 578 entry->owner = THIS_MODULE; 579 } 580 581 return_VALUE(0); 582 } 583 584 585 static int 586 acpi_ec_remove_fs ( 587 struct acpi_device *device) 588 { 589 ACPI_FUNCTION_TRACE("acpi_ec_remove_fs"); 590 591 if (acpi_device_dir(device)) { 592 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); 593 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); 594 acpi_device_dir(device) = NULL; 595 } 596 597 return_VALUE(0); 598 } 599 600 601 /* -------------------------------------------------------------------------- 602 Driver Interface 603 -------------------------------------------------------------------------- */ 604 605 static int 606 acpi_ec_add ( 607 struct acpi_device *device) 608 { 609 int result = 0; 610 acpi_status status = AE_OK; 611 struct acpi_ec *ec = NULL; 612 unsigned long uid; 613 614 ACPI_FUNCTION_TRACE("acpi_ec_add"); 615 616 if (!device) 617 return_VALUE(-EINVAL); 618 619 ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); 620 if (!ec) 621 return_VALUE(-ENOMEM); 622 memset(ec, 0, sizeof(struct acpi_ec)); 623 624 ec->handle = device->handle; 625 ec->uid = -1; 626 spin_lock_init(&ec->lock); 627 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); 628 strcpy(acpi_device_class(device), ACPI_EC_CLASS); 629 acpi_driver_data(device) = ec; 630 631 /* Use the global lock for all EC transactions? */ 632 acpi_evaluate_integer(ec->handle, "_GLK", NULL, &ec->global_lock); 633 634 /* If our UID matches the UID for the ECDT-enumerated EC, 635 we now have the *real* EC info, so kill the makeshift one.*/ 636 acpi_evaluate_integer(ec->handle, "_UID", NULL, &uid); 637 if (ec_ecdt && ec_ecdt->uid == uid) { 638 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, 639 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler); 640 641 acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, &acpi_ec_gpe_handler); 642 643 kfree(ec_ecdt); 644 } 645 646 /* Get GPE bit assignment (EC events). */ 647 /* TODO: Add support for _GPE returning a package */ 648 status = acpi_evaluate_integer(ec->handle, "_GPE", NULL, &ec->gpe_bit); 649 if (ACPI_FAILURE(status)) { 650 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 651 "Error obtaining GPE bit assignment\n")); 652 result = -ENODEV; 653 goto end; 654 } 655 656 result = acpi_ec_add_fs(device); 657 if (result) 658 goto end; 659 660 printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n", 661 acpi_device_name(device), acpi_device_bid(device), 662 (u32) ec->gpe_bit); 663 664 if (!first_ec) 665 first_ec = device; 666 667 end: 668 if (result) 669 kfree(ec); 670 671 return_VALUE(result); 672 } 673 674 675 static int 676 acpi_ec_remove ( 677 struct acpi_device *device, 678 int type) 679 { 680 struct acpi_ec *ec = NULL; 681 682 ACPI_FUNCTION_TRACE("acpi_ec_remove"); 683 684 if (!device) 685 return_VALUE(-EINVAL); 686 687 ec = acpi_driver_data(device); 688 689 acpi_ec_remove_fs(device); 690 691 kfree(ec); 692 693 return_VALUE(0); 694 } 695 696 697 static acpi_status 698 acpi_ec_io_ports ( 699 struct acpi_resource *resource, 700 void *context) 701 { 702 struct acpi_ec *ec = (struct acpi_ec *) context; 703 struct acpi_generic_address *addr; 704 705 if (resource->id != ACPI_RSTYPE_IO) { 706 return AE_OK; 707 } 708 709 /* 710 * The first address region returned is the data port, and 711 * the second address region returned is the status/command 712 * port. 713 */ 714 if (ec->data_addr.register_bit_width == 0) { 715 addr = &ec->data_addr; 716 } else if (ec->command_addr.register_bit_width == 0) { 717 addr = &ec->command_addr; 718 } else { 719 return AE_CTRL_TERMINATE; 720 } 721 722 addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO; 723 addr->register_bit_width = 8; 724 addr->register_bit_offset = 0; 725 addr->address = resource->data.io.min_base_address; 726 727 return AE_OK; 728 } 729 730 731 static int 732 acpi_ec_start ( 733 struct acpi_device *device) 734 { 735 acpi_status status = AE_OK; 736 struct acpi_ec *ec = NULL; 737 738 ACPI_FUNCTION_TRACE("acpi_ec_start"); 739 740 if (!device) 741 return_VALUE(-EINVAL); 742 743 ec = acpi_driver_data(device); 744 745 if (!ec) 746 return_VALUE(-EINVAL); 747 748 /* 749 * Get I/O port addresses. Convert to GAS format. 750 */ 751 status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS, 752 acpi_ec_io_ports, ec); 753 if (ACPI_FAILURE(status) || ec->command_addr.register_bit_width == 0) { 754 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error getting I/O port addresses")); 755 return_VALUE(-ENODEV); 756 } 757 758 ec->status_addr = ec->command_addr; 759 760 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n", 761 (u32) ec->gpe_bit, (u32) ec->command_addr.address, 762 (u32) ec->data_addr.address)); 763 764 /* 765 * Install GPE handler 766 */ 767 status = acpi_install_gpe_handler(NULL, ec->gpe_bit, 768 ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, ec); 769 if (ACPI_FAILURE(status)) { 770 return_VALUE(-ENODEV); 771 } 772 acpi_set_gpe_type (NULL, ec->gpe_bit, ACPI_GPE_TYPE_RUNTIME); 773 acpi_enable_gpe (NULL, ec->gpe_bit, ACPI_NOT_ISR); 774 775 status = acpi_install_address_space_handler (ec->handle, 776 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler, 777 &acpi_ec_space_setup, ec); 778 if (ACPI_FAILURE(status)) { 779 acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler); 780 return_VALUE(-ENODEV); 781 } 782 783 return_VALUE(AE_OK); 784 } 785 786 787 static int 788 acpi_ec_stop ( 789 struct acpi_device *device, 790 int type) 791 { 792 acpi_status status = AE_OK; 793 struct acpi_ec *ec = NULL; 794 795 ACPI_FUNCTION_TRACE("acpi_ec_stop"); 796 797 if (!device) 798 return_VALUE(-EINVAL); 799 800 ec = acpi_driver_data(device); 801 802 status = acpi_remove_address_space_handler(ec->handle, 803 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler); 804 if (ACPI_FAILURE(status)) 805 return_VALUE(-ENODEV); 806 807 status = acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler); 808 if (ACPI_FAILURE(status)) 809 return_VALUE(-ENODEV); 810 811 return_VALUE(0); 812 } 813 814 static acpi_status __init 815 acpi_fake_ecdt_callback ( 816 acpi_handle handle, 817 u32 Level, 818 void *context, 819 void **retval) 820 { 821 acpi_status status; 822 823 status = acpi_walk_resources(handle, METHOD_NAME__CRS, 824 acpi_ec_io_ports, ec_ecdt); 825 if (ACPI_FAILURE(status)) 826 return status; 827 ec_ecdt->status_addr = ec_ecdt->command_addr; 828 829 ec_ecdt->uid = -1; 830 acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid); 831 832 status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->gpe_bit); 833 if (ACPI_FAILURE(status)) 834 return status; 835 spin_lock_init(&ec_ecdt->lock); 836 ec_ecdt->global_lock = TRUE; 837 ec_ecdt->handle = handle; 838 839 printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n", 840 (u32) ec_ecdt->gpe_bit, (u32) ec_ecdt->command_addr.address, 841 (u32) ec_ecdt->data_addr.address); 842 843 return AE_CTRL_TERMINATE; 844 } 845 846 /* 847 * Some BIOS (such as some from Gateway laptops) access EC region very early 848 * such as in BAT0._INI or EC._INI before an EC device is found and 849 * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily 850 * required, but if EC regison is accessed early, it is required. 851 * The routine tries to workaround the BIOS bug by pre-scan EC device 852 * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any 853 * op region (since _REG isn't invoked yet). The assumption is true for 854 * all systems found. 855 */ 856 static int __init 857 acpi_ec_fake_ecdt(void) 858 { 859 acpi_status status; 860 int ret = 0; 861 862 printk(KERN_INFO PREFIX "Try to make an fake ECDT\n"); 863 864 ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); 865 if (!ec_ecdt) { 866 ret = -ENOMEM; 867 goto error; 868 } 869 memset(ec_ecdt, 0, sizeof(struct acpi_ec)); 870 871 status = acpi_get_devices (ACPI_EC_HID, 872 acpi_fake_ecdt_callback, 873 NULL, 874 NULL); 875 if (ACPI_FAILURE(status)) { 876 kfree(ec_ecdt); 877 ec_ecdt = NULL; 878 ret = -ENODEV; 879 goto error; 880 } 881 return 0; 882 error: 883 printk(KERN_ERR PREFIX "Can't make an fake ECDT\n"); 884 return ret; 885 } 886 887 static int __init 888 acpi_ec_get_real_ecdt(void) 889 { 890 acpi_status status; 891 struct acpi_table_ecdt *ecdt_ptr; 892 893 status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, 894 (struct acpi_table_header **) &ecdt_ptr); 895 if (ACPI_FAILURE(status)) 896 return -ENODEV; 897 898 printk(KERN_INFO PREFIX "Found ECDT\n"); 899 900 /* 901 * Generate a temporary ec context to use until the namespace is scanned 902 */ 903 ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); 904 if (!ec_ecdt) 905 return -ENOMEM; 906 memset(ec_ecdt, 0, sizeof(struct acpi_ec)); 907 908 ec_ecdt->command_addr = ecdt_ptr->ec_control; 909 ec_ecdt->status_addr = ecdt_ptr->ec_control; 910 ec_ecdt->data_addr = ecdt_ptr->ec_data; 911 ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit; 912 spin_lock_init(&ec_ecdt->lock); 913 /* use the GL just to be safe */ 914 ec_ecdt->global_lock = TRUE; 915 ec_ecdt->uid = ecdt_ptr->uid; 916 917 status = acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle); 918 if (ACPI_FAILURE(status)) { 919 goto error; 920 } 921 922 return 0; 923 error: 924 printk(KERN_ERR PREFIX "Could not use ECDT\n"); 925 kfree(ec_ecdt); 926 ec_ecdt = NULL; 927 928 return -ENODEV; 929 } 930 931 static int __initdata acpi_fake_ecdt_enabled; 932 int __init 933 acpi_ec_ecdt_probe (void) 934 { 935 acpi_status status; 936 int ret; 937 938 ret = acpi_ec_get_real_ecdt(); 939 /* Try to make a fake ECDT */ 940 if (ret && acpi_fake_ecdt_enabled) { 941 ret = acpi_ec_fake_ecdt(); 942 } 943 944 if (ret) 945 return 0; 946 947 /* 948 * Install GPE handler 949 */ 950 status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe_bit, 951 ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, 952 ec_ecdt); 953 if (ACPI_FAILURE(status)) { 954 goto error; 955 } 956 acpi_set_gpe_type (NULL, ec_ecdt->gpe_bit, ACPI_GPE_TYPE_RUNTIME); 957 acpi_enable_gpe (NULL, ec_ecdt->gpe_bit, ACPI_NOT_ISR); 958 959 status = acpi_install_address_space_handler (ACPI_ROOT_OBJECT, 960 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler, 961 &acpi_ec_space_setup, ec_ecdt); 962 if (ACPI_FAILURE(status)) { 963 acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, 964 &acpi_ec_gpe_handler); 965 goto error; 966 } 967 968 return 0; 969 970 error: 971 printk(KERN_ERR PREFIX "Could not use ECDT\n"); 972 kfree(ec_ecdt); 973 ec_ecdt = NULL; 974 975 return -ENODEV; 976 } 977 978 979 static int __init acpi_ec_init (void) 980 { 981 int result = 0; 982 983 ACPI_FUNCTION_TRACE("acpi_ec_init"); 984 985 if (acpi_disabled) 986 return_VALUE(0); 987 988 acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); 989 if (!acpi_ec_dir) 990 return_VALUE(-ENODEV); 991 992 /* Now register the driver for the EC */ 993 result = acpi_bus_register_driver(&acpi_ec_driver); 994 if (result < 0) { 995 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); 996 return_VALUE(-ENODEV); 997 } 998 999 return_VALUE(result); 1000 } 1001 1002 subsys_initcall(acpi_ec_init); 1003 1004 /* EC driver currently not unloadable */ 1005 #if 0 1006 static void __exit 1007 acpi_ec_exit (void) 1008 { 1009 ACPI_FUNCTION_TRACE("acpi_ec_exit"); 1010 1011 acpi_bus_unregister_driver(&acpi_ec_driver); 1012 1013 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); 1014 1015 return_VOID; 1016 } 1017 #endif /* 0 */ 1018 1019 static int __init acpi_fake_ecdt_setup(char *str) 1020 { 1021 acpi_fake_ecdt_enabled = 1; 1022 return 0; 1023 } 1024 __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup); 1025