err.no Git - linux-2.6/blob - drivers/acpi/ec.c

   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 <linux/interrupt.h>
  35 #include <asm/io.h>
  36 #include <acpi/acpi_bus.h>
  37 #include <acpi/acpi_drivers.h>
  38 #include <acpi/actypes.h>
  39
  40 #define _COMPONENT              ACPI_EC_COMPONENT
  41 ACPI_MODULE_NAME("acpi_ec")
  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 #define ACPI_EC_FLAG_OBF        0x01    /* Output buffer full */
  49 #define ACPI_EC_FLAG_IBF        0x02    /* Input buffer full */
  50 #define ACPI_EC_FLAG_BURST      0x10    /* burst mode */
  51 #define ACPI_EC_FLAG_SCI        0x20    /* EC-SCI occurred */
  52 #define ACPI_EC_EVENT_OBF       0x01    /* Output buffer full */
  53 #define ACPI_EC_EVENT_IBE       0x02    /* Input buffer empty */
  54 #define ACPI_EC_DELAY           50      /* Wait 50ms max. during EC ops */
  55 #define ACPI_EC_UDELAY_GLK      1000    /* Wait 1ms max. to get global lock */
  56 #define ACPI_EC_UDELAY         100      /* Poll @ 100us increments */
  57 #define ACPI_EC_UDELAY_COUNT   1000     /* Wait 10ms max. during EC ops */
  58 #define ACPI_EC_COMMAND_READ    0x80
  59 #define ACPI_EC_COMMAND_WRITE   0x81
  60 #define ACPI_EC_BURST_ENABLE    0x82
  61 #define ACPI_EC_BURST_DISABLE   0x83
  62 #define ACPI_EC_COMMAND_QUERY   0x84
  63 #define EC_POLL                 0xFF
  64 #define EC_INTR                 0x00
  65 static int acpi_ec_remove(struct acpi_device *device, int type);
  66 static int acpi_ec_start(struct acpi_device *device);
  67 static int acpi_ec_stop(struct acpi_device *device, int type);
  68 static int acpi_ec_intr_add(struct acpi_device *device);
  69 static int acpi_ec_poll_add(struct acpi_device *device);
  70
  71 static struct acpi_driver acpi_ec_driver = {
  72         .name = ACPI_EC_DRIVER_NAME,
  73         .class = ACPI_EC_CLASS,
  74         .ids = ACPI_EC_HID,
  75         .ops = {
  76                 .add = acpi_ec_intr_add,
  77                 .remove = acpi_ec_remove,
  78                 .start = acpi_ec_start,
  79                 .stop = acpi_ec_stop,
  80                 },
  81 };
  82 union acpi_ec {
  83         struct {
  84                 u32 mode;
  85                 acpi_handle handle;
  86                 unsigned long uid;
  87                 unsigned long gpe_bit;
  88                 struct acpi_generic_address status_addr;
  89                 struct acpi_generic_address command_addr;
  90                 struct acpi_generic_address data_addr;
  91                 unsigned long global_lock;
  92         } common;
  93
  94         struct {
  95                 u32 mode;
  96                 acpi_handle handle;
  97                 unsigned long uid;
  98                 unsigned long gpe_bit;
  99                 struct acpi_generic_address status_addr;
 100                 struct acpi_generic_address command_addr;
 101                 struct acpi_generic_address data_addr;
 102                 unsigned long global_lock;
 103                 u8 expect_event;
 104                 atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */
 105                 atomic_t pending_gpe;
 106                 struct semaphore sem;
 107                 wait_queue_head_t wait;
 108         } intr;
 109
 110         struct {
 111                 u32 mode;
 112                 acpi_handle handle;
 113                 unsigned long uid;
 114                 unsigned long gpe_bit;
 115                 struct acpi_generic_address status_addr;
 116                 struct acpi_generic_address command_addr;
 117                 struct acpi_generic_address data_addr;
 118                 unsigned long global_lock;
 119                 struct semaphore sem;
 120         } poll;
 121 };
 122
 123 static int acpi_ec_poll_wait(union acpi_ec *ec, u8 event);
 124 static int acpi_ec_intr_wait(union acpi_ec *ec, u8 event);
 125 static int acpi_ec_poll_transaction(union acpi_ec *ec, u8 command,
 126                                     const u8 *wdata, unsigned wdata_len,
 127                                     u8 *rdata, unsigned rdata_len);
 128 static int acpi_ec_intr_transaction(union acpi_ec *ec, u8 command,
 129                                     const u8 *wdata, unsigned wdata_len,
 130                                     u8 *rdata, unsigned rdata_len);
 131 static void acpi_ec_gpe_poll_query(void *ec_cxt);
 132 static void acpi_ec_gpe_intr_query(void *ec_cxt);
 133 static u32 acpi_ec_gpe_poll_handler(void *data);
 134 static u32 acpi_ec_gpe_intr_handler(void *data);
 135 static acpi_status __init
 136 acpi_fake_ecdt_poll_callback(acpi_handle handle,
 137                                 u32 Level, void *context, void **retval);
 138
 139 static acpi_status __init
 140 acpi_fake_ecdt_intr_callback(acpi_handle handle,
 141                               u32 Level, void *context, void **retval);
 142
 143 static int __init acpi_ec_poll_get_real_ecdt(void);
 144 static int __init acpi_ec_intr_get_real_ecdt(void);
 145 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
 146 static union acpi_ec *ec_ecdt;
 147
 148 /* External interfaces use first EC only, so remember */
 149 static struct acpi_device *first_ec;
 150 static int acpi_ec_poll_mode = EC_INTR;
 151
 152 /* --------------------------------------------------------------------------
 153                              Transaction Management
 154    -------------------------------------------------------------------------- */
 155
 156 static u32 acpi_ec_read_status(union acpi_ec *ec)
 157 {
 158         u32 status = 0;
 159
 160         acpi_hw_low_level_read(8, &status, &ec->common.status_addr);
 161         return status;
 162 }
 163
 164 static int acpi_ec_check_status(u32 status, u8 event) {
 165
 166         switch (event) {
 167         case ACPI_EC_EVENT_OBF:
 168                 if (status & ACPI_EC_FLAG_OBF)
 169                         return 1;
 170         case ACPI_EC_EVENT_IBE:
 171                 if (!(status & ACPI_EC_FLAG_IBF))
 172                         return 1;
 173         default:
 174                 break;
 175         }
 176
 177         return 0;
 178 }
 179
 180 static int acpi_ec_wait(union acpi_ec *ec, u8 event)
 181 {
 182         if (acpi_ec_poll_mode)
 183                 return acpi_ec_poll_wait(ec, event);
 184         else
 185                 return acpi_ec_intr_wait(ec, event);
 186 }
 187
 188 static int acpi_ec_poll_wait(union acpi_ec *ec, u8 event)
 189 {
 190         u32 acpi_ec_status = 0;
 191         u32 i = ACPI_EC_UDELAY_COUNT;
 192
 193         if (!ec)
 194                 return -EINVAL;
 195
 196         /* Poll the EC status register waiting for the event to occur. */
 197         switch (event) {
 198         case ACPI_EC_EVENT_OBF:
 199                 do {
 200                         acpi_hw_low_level_read(8, &acpi_ec_status,
 201                                                &ec->common.status_addr);
 202                         if (acpi_ec_status & ACPI_EC_FLAG_OBF)
 203                                 return 0;
 204                         udelay(ACPI_EC_UDELAY);
 205                 } while (--i > 0);
 206                 break;
 207         case ACPI_EC_EVENT_IBE:
 208                 do {
 209                         acpi_hw_low_level_read(8, &acpi_ec_status,
 210                                                &ec->common.status_addr);
 211                         if (!(acpi_ec_status & ACPI_EC_FLAG_IBF))
 212                                 return 0;
 213                         udelay(ACPI_EC_UDELAY);
 214                 } while (--i > 0);
 215                 break;
 216         default:
 217                 return -EINVAL;
 218         }
 219
 220         return -ETIME;
 221 }
 222
 223 static int acpi_ec_intr_wait(union acpi_ec *ec, u8 event)
 224 {
 225         long            time_left;
 226
 227         ec->intr.expect_event = event;
 228
 229         if (acpi_ec_check_status(acpi_ec_read_status(ec), event)) {
 230                         ec->intr.expect_event = 0;
 231                         return 0;
 232         }
 233
 234         time_left = wait_event_timeout(ec->intr.wait, !ec->intr.expect_event,
 235                                         msecs_to_jiffies(ACPI_EC_DELAY));
 236
 237         ec->intr.expect_event = 0;
 238         if (time_left <= 0) {
 239                 if (acpi_ec_check_status(acpi_ec_read_status(ec), event)) {
 240                                 return 0;
 241                 }
 242         } else {
 243                 return 0;
 244         }
 245
 246         return -ETIME;
 247 }
 248
 249 #ifdef ACPI_FUTURE_USAGE
 250 /*
 251  * Note: samsung nv5000 doesn't work with ec burst mode.
 252  * http://bugzilla.kernel.org/show_bug.cgi?id=4980
 253  */
 254 int acpi_ec_enter_burst_mode(union acpi_ec *ec)
 255 {
 256         u32 tmp = 0;
 257         int status = 0;
 258
 259
 260         status = acpi_ec_read_status(ec);
 261         if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
 262                 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 263                 if (status)
 264                         goto end;
 265                 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE,
 266                                         &ec->common.command_addr);
 267                 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
 268                 acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr);
 269                 if (tmp != 0x90) {      /* Burst ACK byte */
 270                         return -EINVAL;
 271                 }
 272         }
 273
 274         atomic_set(&ec->intr.leaving_burst, 0);
 275         return 0;
 276       end:
 277         ACPI_EXCEPTION ((AE_INFO, status, "EC wait, burst mode");
 278         return -1;
 279 }
 280
 281 int acpi_ec_leave_burst_mode(union acpi_ec *ec)
 282 {
 283         int status = 0;
 284
 285
 286         status = acpi_ec_read_status(ec);
 287         if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){
 288                 status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
 289                 if(status)
 290                         goto end;
 291                 acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->common.command_addr);
 292                 acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
 293         }
 294         atomic_set(&ec->intr.leaving_burst, 1);
 295         return 0;
 296 end:
 297         ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode");
 298         return -1;
 299 }
 300 #endif /* ACPI_FUTURE_USAGE */
 301
 302 static int acpi_ec_transaction(union acpi_ec *ec, u8 command,
 303                                const u8 *wdata, unsigned wdata_len,
 304                                u8 *rdata, unsigned rdata_len)
 305 {
 306         if (acpi_ec_poll_mode)
 307                 return acpi_ec_poll_transaction(ec, command, wdata, wdata_len, rdata, rdata_len);
 308         else
 309                 return acpi_ec_intr_transaction(ec, command, wdata, wdata_len, rdata, rdata_len);
 310 }
 311 static int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data)
 312 {
 313         int result;
 314         u8 d;
 315         result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, &address, 1, &d, 1);
 316         *data = d;
 317         return result;
 318 }
 319 static int acpi_ec_write(union acpi_ec *ec, u8 address, u8 data)
 320 {
 321         u8 wdata[2] = { address, data };
 322         return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, wdata, 2, NULL, 0);
 323 }
 324
 325 static int acpi_ec_transaction_unlocked(union acpi_ec *ec, u8 command,
 326                                              const u8 *wdata, unsigned wdata_len,
 327                                              u8 *rdata, unsigned rdata_len)
 328 {
 329         int result;
 330
 331         acpi_hw_low_level_write(8, command, &ec->common.command_addr);
 332
 333         for (; wdata_len > 0; wdata_len --) {
 334                 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 335                 if (result)
 336                         return result;
 337
 338                 acpi_hw_low_level_write(8, *(wdata++), &ec->common.data_addr);
 339         }
 340
 341         if (command == ACPI_EC_COMMAND_WRITE) {
 342                 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 343                 if (result)
 344                         return result;
 345         }
 346
 347         for (; rdata_len > 0; rdata_len --) {
 348                 u32 d;
 349
 350                 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
 351                 if (result)
 352                         return result;
 353
 354                 acpi_hw_low_level_read(8, &d, &ec->common.data_addr);
 355                 *(rdata++) = (u8) d;
 356         }
 357
 358         return 0;
 359 }
 360
 361 static int acpi_ec_poll_transaction(union acpi_ec *ec, u8 command,
 362                                     const u8 *wdata, unsigned wdata_len,
 363                                     u8 *rdata, unsigned rdata_len)
 364 {
 365         acpi_status status = AE_OK;
 366         int result;
 367         u32 glk = 0;
 368
 369         if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata))
 370                 return -EINVAL;
 371
 372         if (rdata)
 373                 memset(rdata, 0, rdata_len);
 374
 375         if (ec->common.global_lock) {
 376                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 377                 if (ACPI_FAILURE(status))
 378                         return -ENODEV;
 379         }
 380
 381         if (down_interruptible(&ec->poll.sem)) {
 382                 result = -ERESTARTSYS;
 383                 goto end_nosem;
 384         }
 385
 386         result = acpi_ec_transaction_unlocked(ec, command,
 387                                               wdata, wdata_len,
 388                                               rdata, rdata_len);
 389         up(&ec->poll.sem);
 390
 391 end_nosem:
 392         if (ec->common.global_lock)
 393                 acpi_release_global_lock(glk);
 394
 395         return result;
 396 }
 397
 398 static int acpi_ec_intr_transaction(union acpi_ec *ec, u8 command,
 399                                     const u8 *wdata, unsigned wdata_len,
 400                                     u8 *rdata, unsigned rdata_len)
 401 {
 402         int status;
 403         u32 glk;
 404
 405         if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata))
 406                 return -EINVAL;
 407
 408         if (rdata)
 409                 memset(rdata, 0, rdata_len);
 410
 411         if (ec->common.global_lock) {
 412                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 413                 if (ACPI_FAILURE(status))
 414                         return -ENODEV;
 415         }
 416
 417         WARN_ON(in_interrupt());
 418         down(&ec->intr.sem);
 419
 420         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 421         if (status) {
 422                 printk(KERN_DEBUG PREFIX "read EC, IB not empty\n");
 423                 goto end;
 424         }
 425
 426         status = acpi_ec_transaction_unlocked(ec, command,
 427                                               wdata, wdata_len,
 428                                               rdata, rdata_len);
 429
 430 end:
 431         up(&ec->intr.sem);
 432
 433         if (ec->common.global_lock)
 434                 acpi_release_global_lock(glk);
 435
 436         return status;
 437 }
 438
 439 /*
 440  * Externally callable EC access functions. For now, assume 1 EC only
 441  */
 442 int ec_read(u8 addr, u8 * val)
 443 {
 444         union acpi_ec *ec;
 445         int err;
 446         u32 temp_data;
 447
 448         if (!first_ec)
 449                 return -ENODEV;
 450
 451         ec = acpi_driver_data(first_ec);
 452
 453         err = acpi_ec_read(ec, addr, &temp_data);
 454
 455         if (!err) {
 456                 *val = temp_data;
 457                 return 0;
 458         } else
 459                 return err;
 460 }
 461
 462 EXPORT_SYMBOL(ec_read);
 463
 464 int ec_write(u8 addr, u8 val)
 465 {
 466         union acpi_ec *ec;
 467         int err;
 468
 469         if (!first_ec)
 470                 return -ENODEV;
 471
 472         ec = acpi_driver_data(first_ec);
 473
 474         err = acpi_ec_write(ec, addr, val);
 475
 476         return err;
 477 }
 478
 479 EXPORT_SYMBOL(ec_write);
 480
 481 extern int ec_transaction(u8 command,
 482                           const u8 *wdata, unsigned wdata_len,
 483                           u8 *rdata, unsigned rdata_len)
 484 {
 485         union acpi_ec *ec;
 486
 487         if (!first_ec)
 488                 return -ENODEV;
 489
 490         ec = acpi_driver_data(first_ec);
 491
 492         return acpi_ec_transaction(ec, command, wdata, wdata_len, rdata, rdata_len);
 493 }
 494
 495 EXPORT_SYMBOL(ec_transaction);
 496
 497 static int acpi_ec_query(union acpi_ec *ec, u32 * data) {
 498         int result;
 499         u8 d;
 500
 501         if (!ec || !data)
 502                 return -EINVAL;
 503
 504         /*
 505          * Query the EC to find out which _Qxx method we need to evaluate.
 506          * Note that successful completion of the query causes the ACPI_EC_SCI
 507          * bit to be cleared (and thus clearing the interrupt source).
 508          */
 509
 510         result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1);
 511         if (result)
 512                 return result;
 513
 514         if (!d)
 515                 return -ENODATA;
 516
 517         *data = d;
 518         return 0;
 519 }
 520
 521 /* --------------------------------------------------------------------------
 522                                 Event Management
 523    -------------------------------------------------------------------------- */
 524
 525 union acpi_ec_query_data {
 526         acpi_handle handle;
 527         u8 data;
 528 };
 529
 530 static void acpi_ec_gpe_query(void *ec_cxt)
 531 {
 532         if (acpi_ec_poll_mode)
 533                 acpi_ec_gpe_poll_query(ec_cxt);
 534         else
 535                 acpi_ec_gpe_intr_query(ec_cxt);
 536 }
 537
 538 static void acpi_ec_gpe_poll_query(void *ec_cxt)
 539 {
 540         union acpi_ec *ec = (union acpi_ec *)ec_cxt;
 541         u32 value = 0;
 542         static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
 543         const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
 544                 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
 545         };
 546
 547
 548         if (!ec_cxt)
 549                 goto end;
 550
 551         if (down_interruptible (&ec->poll.sem)) {
 552                 return;
 553         }
 554         acpi_hw_low_level_read(8, &value, &ec->common.command_addr);
 555         up(&ec->poll.sem);
 556
 557         /* TBD: Implement asynch events!
 558          * NOTE: All we care about are EC-SCI's.  Other EC events are
 559          * handled via polling (yuck!).  This is because some systems
 560          * treat EC-SCIs as level (versus EDGE!) triggered, preventing
 561          *  a purely interrupt-driven approach (grumble, grumble).
 562          */
 563         if (!(value & ACPI_EC_FLAG_SCI))
 564                 goto end;
 565
 566         if (acpi_ec_query(ec, &value))
 567                 goto end;
 568
 569         object_name[2] = hex[((value >> 4) & 0x0F)];
 570         object_name[3] = hex[(value & 0x0F)];
 571
 572         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
 573
 574         acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
 575
 576       end:
 577         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
 578 }
 579 static void acpi_ec_gpe_intr_query(void *ec_cxt)
 580 {
 581         union acpi_ec *ec = (union acpi_ec *)ec_cxt;
 582         u32 value;
 583         int result = -ENODATA;
 584         static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
 585         const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
 586                 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
 587         };
 588
 589
 590         if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI)
 591                 result = acpi_ec_query(ec, &value);
 592
 593         if (result)
 594                 goto end;
 595
 596         object_name[2] = hex[((value >> 4) & 0x0F)];
 597         object_name[3] = hex[(value & 0x0F)];
 598
 599         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
 600
 601         acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
 602       end:
 603         atomic_dec(&ec->intr.pending_gpe);
 604         return;
 605 }
 606
 607 static u32 acpi_ec_gpe_handler(void *data)
 608 {
 609         if (acpi_ec_poll_mode)
 610                 return acpi_ec_gpe_poll_handler(data);
 611         else
 612                 return acpi_ec_gpe_intr_handler(data);
 613 }
 614 static u32 acpi_ec_gpe_poll_handler(void *data)
 615 {
 616         acpi_status status = AE_OK;
 617         union acpi_ec *ec = (union acpi_ec *)data;
 618
 619         if (!ec)
 620                 return ACPI_INTERRUPT_NOT_HANDLED;
 621
 622         acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
 623
 624         status = acpi_os_execute(OSL_EC_POLL_HANDLER, acpi_ec_gpe_query, ec);
 625
 626         if (status == AE_OK)
 627                 return ACPI_INTERRUPT_HANDLED;
 628         else
 629                 return ACPI_INTERRUPT_NOT_HANDLED;
 630 }
 631 static u32 acpi_ec_gpe_intr_handler(void *data)
 632 {
 633         acpi_status status = AE_OK;
 634         u32 value;
 635         union acpi_ec *ec = (union acpi_ec *)data;
 636
 637         if (!ec)
 638                 return ACPI_INTERRUPT_NOT_HANDLED;
 639
 640         acpi_clear_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
 641         value = acpi_ec_read_status(ec);
 642
 643         switch (ec->intr.expect_event) {
 644         case ACPI_EC_EVENT_OBF:
 645                 if (!(value & ACPI_EC_FLAG_OBF))
 646                         break;
 647                 ec->intr.expect_event = 0;
 648                 wake_up(&ec->intr.wait);
 649                 break;
 650         case ACPI_EC_EVENT_IBE:
 651                 if ((value & ACPI_EC_FLAG_IBF))
 652                         break;
 653                 ec->intr.expect_event = 0;
 654                 wake_up(&ec->intr.wait);
 655                 break;
 656         default:
 657                 break;
 658         }
 659
 660         if (value & ACPI_EC_FLAG_SCI) {
 661                 atomic_add(1, &ec->intr.pending_gpe);
 662                 status = acpi_os_execute(OSL_EC_BURST_HANDLER,
 663                                                      acpi_ec_gpe_query, ec);
 664                 return status == AE_OK ?
 665                     ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
 666         }
 667         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
 668         return status == AE_OK ?
 669             ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
 670 }
 671
 672 /* --------------------------------------------------------------------------
 673                              Address Space Management
 674    -------------------------------------------------------------------------- */
 675
 676 static acpi_status
 677 acpi_ec_space_setup(acpi_handle region_handle,
 678                     u32 function, void *handler_context, void **return_context)
 679 {
 680         /*
 681          * The EC object is in the handler context and is needed
 682          * when calling the acpi_ec_space_handler.
 683          */
 684         *return_context = (function != ACPI_REGION_DEACTIVATE) ?
 685             handler_context : NULL;
 686
 687         return AE_OK;
 688 }
 689
 690 static acpi_status
 691 acpi_ec_space_handler(u32 function,
 692                       acpi_physical_address address,
 693                       u32 bit_width,
 694                       acpi_integer * value,
 695                       void *handler_context, void *region_context)
 696 {
 697         int result = 0;
 698         union acpi_ec *ec = NULL;
 699         u64 temp = *value;
 700         acpi_integer f_v = 0;
 701         int i = 0;
 702
 703
 704         if ((address > 0xFF) || !value || !handler_context)
 705                 return AE_BAD_PARAMETER;
 706
 707         if (bit_width != 8 && acpi_strict) {
 708                 printk(KERN_WARNING PREFIX
 709                        "acpi_ec_space_handler: bit_width should be 8\n");
 710                 return AE_BAD_PARAMETER;
 711         }
 712
 713         ec = (union acpi_ec *)handler_context;
 714
 715       next_byte:
 716         switch (function) {
 717         case ACPI_READ:
 718                 temp = 0;
 719                 result = acpi_ec_read(ec, (u8) address, (u32 *) & temp);
 720                 break;
 721         case ACPI_WRITE:
 722                 result = acpi_ec_write(ec, (u8) address, (u8) temp);
 723                 break;
 724         default:
 725                 result = -EINVAL;
 726                 goto out;
 727                 break;
 728         }
 729
 730         bit_width -= 8;
 731         if (bit_width) {
 732                 if (function == ACPI_READ)
 733                         f_v |= temp << 8 * i;
 734                 if (function == ACPI_WRITE)
 735                         temp >>= 8;
 736                 i++;
 737                 address++;
 738                 goto next_byte;
 739         }
 740
 741         if (function == ACPI_READ) {
 742                 f_v |= temp << 8 * i;
 743                 *value = f_v;
 744         }
 745
 746       out:
 747         switch (result) {
 748         case -EINVAL:
 749                 return AE_BAD_PARAMETER;
 750                 break;
 751         case -ENODEV:
 752                 return AE_NOT_FOUND;
 753                 break;
 754         case -ETIME:
 755                 return AE_TIME;
 756                 break;
 757         default:
 758                 return AE_OK;
 759         }
 760 }
 761
 762 /* --------------------------------------------------------------------------
 763                               FS Interface (/proc)
 764    -------------------------------------------------------------------------- */
 765
 766 static struct proc_dir_entry *acpi_ec_dir;
 767
 768 static int acpi_ec_read_info(struct seq_file *seq, void *offset)
 769 {
 770         union acpi_ec *ec = (union acpi_ec *)seq->private;
 771
 772
 773         if (!ec)
 774                 goto end;
 775
 776         seq_printf(seq, "gpe bit:                 0x%02x\n",
 777                    (u32) ec->common.gpe_bit);
 778         seq_printf(seq, "ports:                   0x%02x, 0x%02x\n",
 779                    (u32) ec->common.status_addr.address,
 780                    (u32) ec->common.data_addr.address);
 781         seq_printf(seq, "use global lock:         %s\n",
 782                    ec->common.global_lock ? "yes" : "no");
 783         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
 784
 785       end:
 786         return 0;
 787 }
 788
 789 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
 790 {
 791         return single_open(file, acpi_ec_read_info, PDE(inode)->data);
 792 }
 793
 794 static const struct file_operations acpi_ec_info_ops = {
 795         .open = acpi_ec_info_open_fs,
 796         .read = seq_read,
 797         .llseek = seq_lseek,
 798         .release = single_release,
 799         .owner = THIS_MODULE,
 800 };
 801
 802 static int acpi_ec_add_fs(struct acpi_device *device)
 803 {
 804         struct proc_dir_entry *entry = NULL;
 805
 806
 807         if (!acpi_device_dir(device)) {
 808                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 809                                                      acpi_ec_dir);
 810                 if (!acpi_device_dir(device))
 811                         return -ENODEV;
 812         }
 813
 814         entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
 815                                   acpi_device_dir(device));
 816         if (!entry)
 817                 return -ENODEV;
 818         else {
 819                 entry->proc_fops = &acpi_ec_info_ops;
 820                 entry->data = acpi_driver_data(device);
 821                 entry->owner = THIS_MODULE;
 822         }
 823
 824         return 0;
 825 }
 826
 827 static int acpi_ec_remove_fs(struct acpi_device *device)
 828 {
 829
 830         if (acpi_device_dir(device)) {
 831                 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
 832                 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
 833                 acpi_device_dir(device) = NULL;
 834         }
 835
 836         return 0;
 837 }
 838
 839 /* --------------------------------------------------------------------------
 840                                Driver Interface
 841    -------------------------------------------------------------------------- */
 842
 843 static int acpi_ec_poll_add(struct acpi_device *device)
 844 {
 845         int result = 0;
 846         acpi_status status = AE_OK;
 847         union acpi_ec *ec = NULL;
 848
 849
 850         if (!device)
 851                 return -EINVAL;
 852
 853         ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
 854         if (!ec)
 855                 return -ENOMEM;
 856         memset(ec, 0, sizeof(union acpi_ec));
 857
 858         ec->common.handle = device->handle;
 859         ec->common.uid = -1;
 860         init_MUTEX(&ec->poll.sem);
 861         strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
 862         strcpy(acpi_device_class(device), ACPI_EC_CLASS);
 863         acpi_driver_data(device) = ec;
 864
 865         /* Use the global lock for all EC transactions? */
 866         acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
 867                               &ec->common.global_lock);
 868
 869         /* XXX we don't test uids, because on some boxes ecdt uid = 0, see:
 870            http://bugzilla.kernel.org/show_bug.cgi?id=6111 */
 871         if (ec_ecdt) {
 872                 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
 873                                                   ACPI_ADR_SPACE_EC,
 874                                                   &acpi_ec_space_handler);
 875
 876                 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
 877                                         &acpi_ec_gpe_handler);
 878
 879                 kfree(ec_ecdt);
 880         }
 881
 882         /* Get GPE bit assignment (EC events). */
 883         /* TODO: Add support for _GPE returning a package */
 884         status =
 885             acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
 886                                   &ec->common.gpe_bit);
 887         if (ACPI_FAILURE(status)) {
 888                 ACPI_EXCEPTION((AE_INFO, status, "Obtaining GPE bit"));
 889                 result = -ENODEV;
 890                 goto end;
 891         }
 892
 893         result = acpi_ec_add_fs(device);
 894         if (result)
 895                 goto end;
 896
 897         printk(KERN_INFO PREFIX "%s [%s] (gpe %d) polling mode.\n",
 898                acpi_device_name(device), acpi_device_bid(device),
 899                (u32) ec->common.gpe_bit);
 900
 901         if (!first_ec)
 902                 first_ec = device;
 903
 904       end:
 905         if (result)
 906                 kfree(ec);
 907
 908         return result;
 909 }
 910 static int acpi_ec_intr_add(struct acpi_device *device)
 911 {
 912         int result = 0;
 913         acpi_status status = AE_OK;
 914         union acpi_ec *ec = NULL;
 915
 916
 917         if (!device)
 918                 return -EINVAL;
 919
 920         ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
 921         if (!ec)
 922                 return -ENOMEM;
 923         memset(ec, 0, sizeof(union acpi_ec));
 924
 925         ec->common.handle = device->handle;
 926         ec->common.uid = -1;
 927         atomic_set(&ec->intr.pending_gpe, 0);
 928         atomic_set(&ec->intr.leaving_burst, 1);
 929         init_MUTEX(&ec->intr.sem);
 930         init_waitqueue_head(&ec->intr.wait);
 931         strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
 932         strcpy(acpi_device_class(device), ACPI_EC_CLASS);
 933         acpi_driver_data(device) = ec;
 934
 935         /* Use the global lock for all EC transactions? */
 936         acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
 937                               &ec->common.global_lock);
 938
 939         /* XXX we don't test uids, because on some boxes ecdt uid = 0, see:
 940            http://bugzilla.kernel.org/show_bug.cgi?id=6111 */
 941         if (ec_ecdt) {
 942                 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
 943                                                   ACPI_ADR_SPACE_EC,
 944                                                   &acpi_ec_space_handler);
 945
 946                 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
 947                                         &acpi_ec_gpe_handler);
 948
 949                 kfree(ec_ecdt);
 950         }
 951
 952         /* Get GPE bit assignment (EC events). */
 953         /* TODO: Add support for _GPE returning a package */
 954         status =
 955             acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
 956                                   &ec->common.gpe_bit);
 957         if (ACPI_FAILURE(status)) {
 958                 printk(KERN_ERR PREFIX "Obtaining GPE bit assignment\n");
 959                 result = -ENODEV;
 960                 goto end;
 961         }
 962
 963         result = acpi_ec_add_fs(device);
 964         if (result)
 965                 goto end;
 966
 967         printk(KERN_INFO PREFIX "%s [%s] (gpe %d) interrupt mode.\n",
 968                acpi_device_name(device), acpi_device_bid(device),
 969                (u32) ec->common.gpe_bit);
 970
 971         if (!first_ec)
 972                 first_ec = device;
 973
 974       end:
 975         if (result)
 976                 kfree(ec);
 977
 978         return result;
 979 }
 980
 981 static int acpi_ec_remove(struct acpi_device *device, int type)
 982 {
 983         union acpi_ec *ec = NULL;
 984
 985
 986         if (!device)
 987                 return -EINVAL;
 988
 989         ec = acpi_driver_data(device);
 990
 991         acpi_ec_remove_fs(device);
 992
 993         kfree(ec);
 994
 995         return 0;
 996 }
 997
 998 static acpi_status
 999 acpi_ec_io_ports(struct acpi_resource *resource, void *context)
1000 {
1001         union acpi_ec *ec = (union acpi_ec *)context;
1002         struct acpi_generic_address *addr;
1003
1004         if (resource->type != ACPI_RESOURCE_TYPE_IO) {
1005                 return AE_OK;
1006         }
1007
1008         /*
1009          * The first address region returned is the data port, and
1010          * the second address region returned is the status/command
1011          * port.
1012          */
1013         if (ec->common.data_addr.register_bit_width == 0) {
1014                 addr = &ec->common.data_addr;
1015         } else if (ec->common.command_addr.register_bit_width == 0) {
1016                 addr = &ec->common.command_addr;
1017         } else {
1018                 return AE_CTRL_TERMINATE;
1019         }
1020
1021         addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1022         addr->register_bit_width = 8;
1023         addr->register_bit_offset = 0;
1024         addr->address = resource->data.io.minimum;
1025
1026         return AE_OK;
1027 }
1028
1029 static int acpi_ec_start(struct acpi_device *device)
1030 {
1031         acpi_status status = AE_OK;
1032         union acpi_ec *ec = NULL;
1033
1034
1035         if (!device)
1036                 return -EINVAL;
1037
1038         ec = acpi_driver_data(device);
1039
1040         if (!ec)
1041                 return -EINVAL;
1042
1043         /*
1044          * Get I/O port addresses. Convert to GAS format.
1045          */
1046         status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS,
1047                                      acpi_ec_io_ports, ec);
1048         if (ACPI_FAILURE(status)
1049             || ec->common.command_addr.register_bit_width == 0) {
1050                 printk(KERN_ERR PREFIX "Error getting I/O port addresses\n");
1051                 return -ENODEV;
1052         }
1053
1054         ec->common.status_addr = ec->common.command_addr;
1055
1056         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
1057                           (u32) ec->common.gpe_bit,
1058                           (u32) ec->common.command_addr.address,
1059                           (u32) ec->common.data_addr.address));
1060
1061         /*
1062          * Install GPE handler
1063          */
1064         status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit,
1065                                           ACPI_GPE_EDGE_TRIGGERED,
1066                                           &acpi_ec_gpe_handler, ec);
1067         if (ACPI_FAILURE(status)) {
1068                 return -ENODEV;
1069         }
1070         acpi_set_gpe_type(NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1071         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
1072
1073         status = acpi_install_address_space_handler(ec->common.handle,
1074                                                     ACPI_ADR_SPACE_EC,
1075                                                     &acpi_ec_space_handler,
1076                                                     &acpi_ec_space_setup, ec);
1077         if (ACPI_FAILURE(status)) {
1078                 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1079                                         &acpi_ec_gpe_handler);
1080                 return -ENODEV;
1081         }
1082
1083         return AE_OK;
1084 }
1085
1086 static int acpi_ec_stop(struct acpi_device *device, int type)
1087 {
1088         acpi_status status = AE_OK;
1089         union acpi_ec *ec = NULL;
1090
1091
1092         if (!device)
1093                 return -EINVAL;
1094
1095         ec = acpi_driver_data(device);
1096
1097         status = acpi_remove_address_space_handler(ec->common.handle,
1098                                                    ACPI_ADR_SPACE_EC,
1099                                                    &acpi_ec_space_handler);
1100         if (ACPI_FAILURE(status))
1101                 return -ENODEV;
1102
1103         status =
1104             acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1105                                     &acpi_ec_gpe_handler);
1106         if (ACPI_FAILURE(status))
1107                 return -ENODEV;
1108
1109         return 0;
1110 }
1111
1112 static acpi_status __init
1113 acpi_fake_ecdt_callback(acpi_handle handle,
1114                         u32 Level, void *context, void **retval)
1115 {
1116
1117         if (acpi_ec_poll_mode)
1118                 return acpi_fake_ecdt_poll_callback(handle,
1119                                                        Level, context, retval);
1120         else
1121                 return acpi_fake_ecdt_intr_callback(handle,
1122                                                      Level, context, retval);
1123 }
1124
1125 static acpi_status __init
1126 acpi_fake_ecdt_poll_callback(acpi_handle handle,
1127                                 u32 Level, void *context, void **retval)
1128 {
1129         acpi_status status;
1130
1131         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1132                                      acpi_ec_io_ports, ec_ecdt);
1133         if (ACPI_FAILURE(status))
1134                 return status;
1135         ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1136
1137         ec_ecdt->common.uid = -1;
1138         acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1139
1140         status =
1141             acpi_evaluate_integer(handle, "_GPE", NULL,
1142                                   &ec_ecdt->common.gpe_bit);
1143         if (ACPI_FAILURE(status))
1144                 return status;
1145         init_MUTEX(&ec_ecdt->poll.sem);
1146         ec_ecdt->common.global_lock = TRUE;
1147         ec_ecdt->common.handle = handle;
1148
1149         printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1150                (u32) ec_ecdt->common.gpe_bit,
1151                (u32) ec_ecdt->common.command_addr.address,
1152                (u32) ec_ecdt->common.data_addr.address);
1153
1154         return AE_CTRL_TERMINATE;
1155 }
1156
1157 static acpi_status __init
1158 acpi_fake_ecdt_intr_callback(acpi_handle handle,
1159                               u32 Level, void *context, void **retval)
1160 {
1161         acpi_status status;
1162
1163         init_MUTEX(&ec_ecdt->intr.sem);
1164         init_waitqueue_head(&ec_ecdt->intr.wait);
1165         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1166                                      acpi_ec_io_ports, ec_ecdt);
1167         if (ACPI_FAILURE(status))
1168                 return status;
1169         ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1170
1171         ec_ecdt->common.uid = -1;
1172         acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1173
1174         status =
1175             acpi_evaluate_integer(handle, "_GPE", NULL,
1176                                   &ec_ecdt->common.gpe_bit);
1177         if (ACPI_FAILURE(status))
1178                 return status;
1179         ec_ecdt->common.global_lock = TRUE;
1180         ec_ecdt->common.handle = handle;
1181
1182         printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1183                (u32) ec_ecdt->common.gpe_bit,
1184                (u32) ec_ecdt->common.command_addr.address,
1185                (u32) ec_ecdt->common.data_addr.address);
1186
1187         return AE_CTRL_TERMINATE;
1188 }
1189
1190 /*
1191  * Some BIOS (such as some from Gateway laptops) access EC region very early
1192  * such as in BAT0._INI or EC._INI before an EC device is found and
1193  * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
1194  * required, but if EC regison is accessed early, it is required.
1195  * The routine tries to workaround the BIOS bug by pre-scan EC device
1196  * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
1197  * op region (since _REG isn't invoked yet). The assumption is true for
1198  * all systems found.
1199  */
1200 static int __init acpi_ec_fake_ecdt(void)
1201 {
1202         acpi_status status;
1203         int ret = 0;
1204
1205         printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
1206
1207         ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1208         if (!ec_ecdt) {
1209                 ret = -ENOMEM;
1210                 goto error;
1211         }
1212         memset(ec_ecdt, 0, sizeof(union acpi_ec));
1213
1214         status = acpi_get_devices(ACPI_EC_HID,
1215                                   acpi_fake_ecdt_callback, NULL, NULL);
1216         if (ACPI_FAILURE(status)) {
1217                 kfree(ec_ecdt);
1218                 ec_ecdt = NULL;
1219                 ret = -ENODEV;
1220                 goto error;
1221         }
1222         return 0;
1223       error:
1224         printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
1225         return ret;
1226 }
1227
1228 static int __init acpi_ec_get_real_ecdt(void)
1229 {
1230         if (acpi_ec_poll_mode)
1231                 return acpi_ec_poll_get_real_ecdt();
1232         else
1233                 return acpi_ec_intr_get_real_ecdt();
1234 }
1235
1236 static int __init acpi_ec_poll_get_real_ecdt(void)
1237 {
1238         acpi_status status;
1239         struct acpi_table_ecdt *ecdt_ptr;
1240
1241         status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1242                                          (struct acpi_table_header **)
1243                                          &ecdt_ptr);
1244         if (ACPI_FAILURE(status))
1245                 return -ENODEV;
1246
1247         printk(KERN_INFO PREFIX "Found ECDT\n");
1248
1249         /*
1250          * Generate a temporary ec context to use until the namespace is scanned
1251          */
1252         ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1253         if (!ec_ecdt)
1254                 return -ENOMEM;
1255         memset(ec_ecdt, 0, sizeof(union acpi_ec));
1256
1257         ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1258         ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1259         ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1260         ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1261         init_MUTEX(&ec_ecdt->poll.sem);
1262         /* use the GL just to be safe */
1263         ec_ecdt->common.global_lock = TRUE;
1264         ec_ecdt->common.uid = ecdt_ptr->uid;
1265
1266         status =
1267             acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1268         if (ACPI_FAILURE(status)) {
1269                 goto error;
1270         }
1271
1272         return 0;
1273       error:
1274         printk(KERN_ERR PREFIX "Could not use ECDT\n");
1275         kfree(ec_ecdt);
1276         ec_ecdt = NULL;
1277
1278         return -ENODEV;
1279 }
1280
1281 static int __init acpi_ec_intr_get_real_ecdt(void)
1282 {
1283         acpi_status status;
1284         struct acpi_table_ecdt *ecdt_ptr;
1285
1286         status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1287                                          (struct acpi_table_header **)
1288                                          &ecdt_ptr);
1289         if (ACPI_FAILURE(status))
1290                 return -ENODEV;
1291
1292         printk(KERN_INFO PREFIX "Found ECDT\n");
1293
1294         /*
1295          * Generate a temporary ec context to use until the namespace is scanned
1296          */
1297         ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1298         if (!ec_ecdt)
1299                 return -ENOMEM;
1300         memset(ec_ecdt, 0, sizeof(union acpi_ec));
1301
1302         init_MUTEX(&ec_ecdt->intr.sem);
1303         init_waitqueue_head(&ec_ecdt->intr.wait);
1304         ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1305         ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1306         ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1307         ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1308         /* use the GL just to be safe */
1309         ec_ecdt->common.global_lock = TRUE;
1310         ec_ecdt->common.uid = ecdt_ptr->uid;
1311
1312         status =
1313             acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1314         if (ACPI_FAILURE(status)) {
1315                 goto error;
1316         }
1317
1318         return 0;
1319       error:
1320         printk(KERN_ERR PREFIX "Could not use ECDT\n");
1321         kfree(ec_ecdt);
1322         ec_ecdt = NULL;
1323
1324         return -ENODEV;
1325 }
1326
1327 static int __initdata acpi_fake_ecdt_enabled;
1328 int __init acpi_ec_ecdt_probe(void)
1329 {
1330         acpi_status status;
1331         int ret;
1332
1333         ret = acpi_ec_get_real_ecdt();
1334         /* Try to make a fake ECDT */
1335         if (ret && acpi_fake_ecdt_enabled) {
1336                 ret = acpi_ec_fake_ecdt();
1337         }
1338
1339         if (ret)
1340                 return 0;
1341
1342         /*
1343          * Install GPE handler
1344          */
1345         status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1346                                           ACPI_GPE_EDGE_TRIGGERED,
1347                                           &acpi_ec_gpe_handler, ec_ecdt);
1348         if (ACPI_FAILURE(status)) {
1349                 goto error;
1350         }
1351         acpi_set_gpe_type(NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1352         acpi_enable_gpe(NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR);
1353
1354         status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
1355                                                     ACPI_ADR_SPACE_EC,
1356                                                     &acpi_ec_space_handler,
1357                                                     &acpi_ec_space_setup,
1358                                                     ec_ecdt);
1359         if (ACPI_FAILURE(status)) {
1360                 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1361                                         &acpi_ec_gpe_handler);
1362                 goto error;
1363         }
1364
1365         return 0;
1366
1367       error:
1368         printk(KERN_ERR PREFIX "Could not use ECDT\n");
1369         kfree(ec_ecdt);
1370         ec_ecdt = NULL;
1371
1372         return -ENODEV;
1373 }
1374
1375 static int __init acpi_ec_init(void)
1376 {
1377         int result = 0;
1378
1379
1380         if (acpi_disabled)
1381                 return 0;
1382
1383         acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1384         if (!acpi_ec_dir)
1385                 return -ENODEV;
1386
1387         /* Now register the driver for the EC */
1388         result = acpi_bus_register_driver(&acpi_ec_driver);
1389         if (result < 0) {
1390                 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1391                 return -ENODEV;
1392         }
1393
1394         return result;
1395 }
1396
1397 subsys_initcall(acpi_ec_init);
1398
1399 /* EC driver currently not unloadable */
1400 #if 0
1401 static void __exit acpi_ec_exit(void)
1402 {
1403
1404         acpi_bus_unregister_driver(&acpi_ec_driver);
1405
1406         remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1407
1408         return;
1409 }
1410 #endif                          /* 0 */
1411
1412 static int __init acpi_fake_ecdt_setup(char *str)
1413 {
1414         acpi_fake_ecdt_enabled = 1;
1415         return 1;
1416 }
1417
1418 __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
1419 static int __init acpi_ec_set_intr_mode(char *str)
1420 {
1421         int intr;
1422
1423         if (!get_option(&str, &intr))
1424                 return 0;
1425
1426         if (intr) {
1427                 acpi_ec_poll_mode = EC_INTR;
1428                 acpi_ec_driver.ops.add = acpi_ec_intr_add;
1429         } else {
1430                 acpi_ec_poll_mode = EC_POLL;
1431                 acpi_ec_driver.ops.add = acpi_ec_poll_add;
1432         }
1433         printk(KERN_INFO PREFIX "EC %s mode.\n", intr ? "interrupt" : "polling");
1434         return 1;
1435 }
1436
1437 __setup("ec_intr=", acpi_ec_set_intr_mode);