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   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
  43 #define ACPI_EC_COMPONENT               0x00100000
  44 #define ACPI_EC_CLASS                   "embedded_controller"
  45 #define ACPI_EC_HID                     "PNP0C09"
  46 #define ACPI_EC_DRIVER_NAME             "ACPI Embedded Controller Driver"
  47 #define ACPI_EC_DEVICE_NAME             "Embedded Controller"
  48 #define ACPI_EC_FILE_INFO               "info"
  49
  50
  51 #define ACPI_EC_FLAG_OBF        0x01    /* Output buffer full */
  52 #define ACPI_EC_FLAG_IBF        0x02    /* Input buffer full */
  53 #define ACPI_EC_FLAG_BURST      0x10    /* burst mode */
  54 #define ACPI_EC_FLAG_SCI        0x20    /* EC-SCI occurred */
  55
  56 #define ACPI_EC_EVENT_OBF       0x01    /* Output buffer full */
  57 #define ACPI_EC_EVENT_IBE       0x02    /* Input buffer empty */
  58
  59 #define ACPI_EC_DELAY           50      /* Wait 50ms max. during EC ops */
  60 #define ACPI_EC_UDELAY_GLK      1000    /* Wait 1ms max. to get global lock */
  61
  62 #define ACPI_EC_COMMAND_READ    0x80
  63 #define ACPI_EC_COMMAND_WRITE   0x81
  64 #define ACPI_EC_BURST_ENABLE    0x82
  65 #define ACPI_EC_BURST_DISABLE   0x83
  66 #define ACPI_EC_COMMAND_QUERY   0x84
  67
  68 static int acpi_ec_add (struct acpi_device *device);
  69 static int acpi_ec_remove (struct acpi_device *device, int type);
  70 static int acpi_ec_start (struct acpi_device *device);
  71 static int acpi_ec_stop (struct acpi_device *device, int type);
  72
  73 static struct acpi_driver acpi_ec_driver = {
  74         .name =         ACPI_EC_DRIVER_NAME,
  75         .class =        ACPI_EC_CLASS,
  76         .ids =          ACPI_EC_HID,
  77         .ops =          {
  78                                 .add =          acpi_ec_add,
  79                                 .remove =       acpi_ec_remove,
  80                                 .start =        acpi_ec_start,
  81                                 .stop =         acpi_ec_stop,
  82                         },
  83 };
  84
  85 struct acpi_ec {
  86         acpi_handle                     handle;
  87         unsigned long                   uid;
  88         unsigned long                   gpe_bit;
  89         struct acpi_generic_address     status_addr;
  90         struct acpi_generic_address     command_addr;
  91         struct acpi_generic_address     data_addr;
  92         unsigned long                   global_lock;
  93         unsigned int                    expect_event;
  94         atomic_t                        leaving_burst; /* 0 : No, 1 : Yes, 2: abort*/
  95         atomic_t                        pending_gpe;
  96         struct semaphore                sem;
  97         wait_queue_head_t               wait;
  98 };
  99
 100 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
 101 static struct acpi_ec   *ec_ecdt;
 102
 103 /* External interfaces use first EC only, so remember */
 104 static struct acpi_device *first_ec;
 105
 106 /* --------------------------------------------------------------------------
 107                              Transaction Management
 108    -------------------------------------------------------------------------- */
 109
 110 static inline u32 acpi_ec_read_status(struct acpi_ec *ec)
 111 {
 112         u32     status = 0;
 113
 114         acpi_hw_low_level_read(8, &status, &ec->status_addr);
 115         return status;
 116 }
 117
 118 static int acpi_ec_wait(struct acpi_ec *ec, unsigned int event)
 119 {
 120         int     result = 0;
 121
 122         ACPI_FUNCTION_TRACE("acpi_ec_wait");
 123
 124         ec->expect_event = event;
 125         smp_mb();
 126
 127         result = wait_event_interruptible_timeout(ec->wait,
 128                                         !ec->expect_event,
 129                                         msecs_to_jiffies(ACPI_EC_DELAY));
 130
 131         ec->expect_event = 0;
 132         smp_mb();
 133
 134         if (result < 0){
 135                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR," result  = %d ", result));
 136                 return_VALUE(result);
 137         }
 138
 139         /*
 140          * Verify that the event in question has actually happened by
 141          * querying EC status. Do the check even if operation timed-out
 142          * to make sure that we did not miss interrupt.
 143          */
 144         switch (event) {
 145         case ACPI_EC_EVENT_OBF:
 146                 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
 147                         return_VALUE(0);
 148                 break;
 149
 150         case ACPI_EC_EVENT_IBE:
 151                 if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
 152                         return_VALUE(0);
 153                 break;
 154         }
 155
 156         return_VALUE(-ETIME);
 157 }
 158
 159
 160
 161 static int
 162 acpi_ec_enter_burst_mode (
 163         struct acpi_ec          *ec)
 164 {
 165         u32                     tmp = 0;
 166         int                     status = 0;
 167
 168         ACPI_FUNCTION_TRACE("acpi_ec_enter_burst_mode");
 169
 170         status = acpi_ec_read_status(ec);
 171         if (status != -EINVAL &&
 172                 !(status & ACPI_EC_FLAG_BURST)){
 173                 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->command_addr);
 174                 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
 175                 if (status){
 176                         acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
 177                         return_VALUE(-EINVAL);
 178                 }
 179                 acpi_hw_low_level_read(8, &tmp, &ec->data_addr);
 180                 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
 181                 if(tmp != 0x90 ) {/* Burst ACK byte*/
 182                         return_VALUE(-EINVAL);
 183                 }
 184         }
 185
 186         atomic_set(&ec->leaving_burst , 0);
 187         return_VALUE(0);
 188 }
 189
 190 static int
 191 acpi_ec_leave_burst_mode (
 192         struct acpi_ec          *ec)
 193 {
 194         int                     status =0;
 195
 196         ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode");
 197
 198         atomic_set(&ec->leaving_burst , 1);
 199         status = acpi_ec_read_status(ec);
 200         if (status != -EINVAL &&
 201                 (status & ACPI_EC_FLAG_BURST)){
 202                 acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->command_addr);
 203                 status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
 204                 if (status){
 205                         acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
 206                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"------->wait fail\n"));
 207                         return_VALUE(-EINVAL);
 208                 }
 209                 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
 210                 status = acpi_ec_read_status(ec);
 211         }
 212
 213         return_VALUE(0);
 214 }
 215
 216 static int
 217 acpi_ec_read (
 218         struct acpi_ec          *ec,
 219         u8                      address,
 220         u32                     *data)
 221 {
 222         int                     status = 0;
 223         u32                     glk;
 224
 225         ACPI_FUNCTION_TRACE("acpi_ec_read");
 226
 227         if (!ec || !data)
 228                 return_VALUE(-EINVAL);
 229
 230 retry:
 231         *data = 0;
 232
 233         if (ec->global_lock) {
 234                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 235                 if (ACPI_FAILURE(status))
 236                         return_VALUE(-ENODEV);
 237         }
 238
 239         WARN_ON(in_interrupt());
 240         down(&ec->sem);
 241
 242         if(acpi_ec_enter_burst_mode(ec))
 243                 goto end;
 244
 245         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, &ec->command_addr);
 246         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 247         acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
 248         if (status) {
 249                 goto end;
 250         }
 251
 252         acpi_hw_low_level_write(8, address, &ec->data_addr);
 253         status= acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
 254         if (status){
 255                 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
 256                 goto end;
 257         }
 258
 259         acpi_hw_low_level_read(8, data, &ec->data_addr);
 260         acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
 261
 262         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
 263                 *data, address));
 264
 265 end:
 266         acpi_ec_leave_burst_mode(ec);
 267         up(&ec->sem);
 268
 269         if (ec->global_lock)
 270                 acpi_release_global_lock(glk);
 271
 272         if(atomic_read(&ec->leaving_burst) == 2){
 273                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n"));
 274                 while(atomic_read(&ec->pending_gpe)){
 275                         msleep(1);
 276                 }
 277                 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
 278                 goto retry;
 279         }
 280
 281         return_VALUE(status);
 282 }
 283
 284
 285 static int
 286 acpi_ec_write (
 287         struct acpi_ec          *ec,
 288         u8                      address,
 289         u8                      data)
 290 {
 291         int                     status = 0;
 292         u32                     glk;
 293         u32                     tmp;
 294
 295         ACPI_FUNCTION_TRACE("acpi_ec_write");
 296
 297         if (!ec)
 298                 return_VALUE(-EINVAL);
 299 retry:
 300         if (ec->global_lock) {
 301                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 302                 if (ACPI_FAILURE(status))
 303                         return_VALUE(-ENODEV);
 304         }
 305
 306         WARN_ON(in_interrupt());
 307         down(&ec->sem);
 308
 309         if(acpi_ec_enter_burst_mode(ec))
 310                 goto end;
 311
 312         status = acpi_ec_read_status(ec);
 313         if (status != -EINVAL &&
 314                 !(status & ACPI_EC_FLAG_BURST)){
 315                 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->command_addr);
 316                 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
 317                 if (status)
 318                         goto end;
 319                 acpi_hw_low_level_read(8, &tmp, &ec->data_addr);
 320                 if(tmp != 0x90 ) /* Burst ACK byte*/
 321                         goto end;
 322         }
 323         /*Now we are in burst mode*/
 324
 325         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, &ec->command_addr);
 326         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 327         acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
 328         if (status){
 329                 goto end;
 330         }
 331
 332         acpi_hw_low_level_write(8, address, &ec->data_addr);
 333         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 334         if (status){
 335                 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
 336                 goto end;
 337         }
 338
 339         acpi_hw_low_level_write(8, data, &ec->data_addr);
 340         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 341         acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
 342         if (status)
 343                 goto end;
 344
 345         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
 346                 data, address));
 347
 348 end:
 349         acpi_ec_leave_burst_mode(ec);
 350         up(&ec->sem);
 351
 352         if (ec->global_lock)
 353                 acpi_release_global_lock(glk);
 354
 355         if(atomic_read(&ec->leaving_burst) == 2){
 356                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n"));
 357                 while(atomic_read(&ec->pending_gpe)){
 358                         msleep(1);
 359                 }
 360                 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
 361                 goto retry;
 362         }
 363
 364         return_VALUE(status);
 365 }
 366
 367 /*
 368  * Externally callable EC access functions. For now, assume 1 EC only
 369  */
 370 int
 371 ec_read(u8 addr, u8 *val)
 372 {
 373         struct acpi_ec *ec;
 374         int err;
 375         u32 temp_data;
 376
 377         if (!first_ec)
 378                 return -ENODEV;
 379
 380         ec = acpi_driver_data(first_ec);
 381
 382         err = acpi_ec_read(ec, addr, &temp_data);
 383
 384         if (!err) {
 385                 *val = temp_data;
 386                 return 0;
 387         }
 388         else
 389                 return err;
 390 }
 391 EXPORT_SYMBOL(ec_read);
 392
 393 int
 394 ec_write(u8 addr, u8 val)
 395 {
 396         struct acpi_ec *ec;
 397         int err;
 398
 399         if (!first_ec)
 400                 return -ENODEV;
 401
 402         ec = acpi_driver_data(first_ec);
 403
 404         err = acpi_ec_write(ec, addr, val);
 405
 406         return err;
 407 }
 408 EXPORT_SYMBOL(ec_write);
 409
 410
 411 static int
 412 acpi_ec_query (
 413         struct acpi_ec          *ec,
 414         u32                     *data)
 415 {
 416         int                     status = 0;
 417         u32                     glk;
 418
 419         ACPI_FUNCTION_TRACE("acpi_ec_query");
 420
 421         if (!ec || !data)
 422                 return_VALUE(-EINVAL);
 423         *data = 0;
 424
 425         if (ec->global_lock) {
 426                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 427                 if (ACPI_FAILURE(status))
 428                         return_VALUE(-ENODEV);
 429         }
 430
 431         down(&ec->sem);
 432         if(acpi_ec_enter_burst_mode(ec))
 433                 goto end;
 434         /*
 435          * Query the EC to find out which _Qxx method we need to evaluate.
 436          * Note that successful completion of the query causes the ACPI_EC_SCI
 437          * bit to be cleared (and thus clearing the interrupt source).
 438          */
 439         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, &ec->command_addr);
 440         status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
 441         if (status){
 442                 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
 443                 goto end;
 444         }
 445
 446         acpi_hw_low_level_read(8, data, &ec->data_addr);
 447         acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
 448         if (!*data)
 449                 status = -ENODATA;
 450
 451 end:
 452         acpi_ec_leave_burst_mode(ec);
 453         up(&ec->sem);
 454
 455         if (ec->global_lock)
 456                 acpi_release_global_lock(glk);
 457
 458         if(atomic_read(&ec->leaving_burst) == 2){
 459                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n"));
 460                 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
 461                 status = -ENODATA;
 462         }
 463         return_VALUE(status);
 464 }
 465
 466
 467 /* --------------------------------------------------------------------------
 468                                 Event Management
 469    -------------------------------------------------------------------------- */
 470
 471 struct acpi_ec_query_data {
 472         acpi_handle             handle;
 473         u8                      data;
 474 };
 475
 476 static void
 477 acpi_ec_gpe_query (
 478         void                    *ec_cxt)
 479 {
 480         struct acpi_ec          *ec = (struct acpi_ec *) ec_cxt;
 481         u32                     value;
 482         int                     result = -ENODATA;
 483         static char             object_name[5] = {'_','Q','0','0','\0'};
 484         const char              hex[] = {'0','1','2','3','4','5','6','7',
 485                                          '8','9','A','B','C','D','E','F'};
 486
 487         ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
 488
 489         if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI)
 490                 result = acpi_ec_query(ec, &value);
 491
 492         if (result)
 493                 goto end;
 494
 495         object_name[2] = hex[((value >> 4) & 0x0F)];
 496         object_name[3] = hex[(value & 0x0F)];
 497
 498         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
 499
 500         acpi_evaluate_object(ec->handle, object_name, NULL, NULL);
 501 end:
 502         atomic_dec(&ec->pending_gpe);
 503         return;
 504 }
 505
 506 static u32
 507 acpi_ec_gpe_handler (
 508         void                    *data)
 509 {
 510         acpi_status             status = AE_OK;
 511         u32                     value;
 512         struct acpi_ec          *ec = (struct acpi_ec *) data;
 513
 514         if (!ec)
 515                 return ACPI_INTERRUPT_NOT_HANDLED;
 516
 517         acpi_disable_gpe(NULL, ec->gpe_bit, ACPI_ISR);
 518
 519         value = acpi_ec_read_status(ec);
 520
 521         if((value & ACPI_EC_FLAG_IBF) &&
 522                 !(value & ACPI_EC_FLAG_BURST) &&
 523                         (atomic_read(&ec->leaving_burst) == 0)) {
 524         /*
 525          * the embedded controller disables
 526          * burst mode for any reason other
 527          * than the burst disable command
 528          * to process critical event.
 529          */
 530                 atomic_set(&ec->leaving_burst , 2); /* block current pending transaction
 531                                         and retry */
 532                 wake_up(&ec->wait);
 533         }else {
 534                 if ((ec->expect_event == ACPI_EC_EVENT_OBF &&
 535                                 (value & ACPI_EC_FLAG_OBF)) ||
 536                                 (ec->expect_event == ACPI_EC_EVENT_IBE &&
 537                                 !(value & ACPI_EC_FLAG_IBF))) {
 538                         ec->expect_event = 0;
 539                         wake_up(&ec->wait);
 540                         return ACPI_INTERRUPT_HANDLED;
 541                 }
 542         }
 543
 544         if (value & ACPI_EC_FLAG_SCI){
 545                 atomic_add(1, &ec->pending_gpe) ;
 546                 status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
 547                                                 acpi_ec_gpe_query, ec);
 548                 return status == AE_OK ?
 549                 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
 550         }
 551         acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_ISR);
 552         return status == AE_OK ?
 553                 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
 554 }
 555
 556 /* --------------------------------------------------------------------------
 557                              Address Space Management
 558    -------------------------------------------------------------------------- */
 559
 560 static acpi_status
 561 acpi_ec_space_setup (
 562         acpi_handle             region_handle,
 563         u32                     function,
 564         void                    *handler_context,
 565         void                    **return_context)
 566 {
 567         /*
 568          * The EC object is in the handler context and is needed
 569          * when calling the acpi_ec_space_handler.
 570          */
 571         *return_context  = (function != ACPI_REGION_DEACTIVATE) ?
 572                                                 handler_context : NULL;
 573
 574         return AE_OK;
 575 }
 576
 577
 578 static acpi_status
 579 acpi_ec_space_handler (
 580         u32                     function,
 581         acpi_physical_address   address,
 582         u32                     bit_width,
 583         acpi_integer            *value,
 584         void                    *handler_context,
 585         void                    *region_context)
 586 {
 587         int                     result = 0;
 588         struct acpi_ec          *ec = NULL;
 589         u64                     temp = *value;
 590         acpi_integer            f_v = 0;
 591         int                     i = 0;
 592
 593         ACPI_FUNCTION_TRACE("acpi_ec_space_handler");
 594
 595         if ((address > 0xFF) || !value || !handler_context)
 596                 return_VALUE(AE_BAD_PARAMETER);
 597
 598         if (bit_width != 8 && acpi_strict) {
 599                 printk(KERN_WARNING PREFIX "acpi_ec_space_handler: bit_width should be 8\n");
 600                 return_VALUE(AE_BAD_PARAMETER);
 601         }
 602
 603         ec = (struct acpi_ec *) handler_context;
 604
 605 next_byte:
 606         switch (function) {
 607         case ACPI_READ:
 608                 temp = 0;
 609                 result = acpi_ec_read(ec, (u8) address, (u32 *)&temp);
 610                 break;
 611         case ACPI_WRITE:
 612                 result = acpi_ec_write(ec, (u8) address, (u8) temp);
 613                 break;
 614         default:
 615                 result = -EINVAL;
 616                 goto out;
 617                 break;
 618         }
 619
 620         bit_width -= 8;
 621         if (bit_width) {
 622                 if (function == ACPI_READ)
 623                         f_v |= temp << 8 * i;
 624                 if (function == ACPI_WRITE)
 625                         temp >>= 8;
 626                 i++;
 627                 address++;
 628                 goto next_byte;
 629         }
 630
 631         if (function == ACPI_READ) {
 632                 f_v |= temp << 8 * i;
 633                 *value = f_v;
 634         }
 635
 636
 637 out:
 638         switch (result) {
 639         case -EINVAL:
 640                 return_VALUE(AE_BAD_PARAMETER);
 641                 break;
 642         case -ENODEV:
 643                 return_VALUE(AE_NOT_FOUND);
 644                 break;
 645         case -ETIME:
 646                 return_VALUE(AE_TIME);
 647                 break;
 648         default:
 649                 return_VALUE(AE_OK);
 650         }
 651 }
 652
 653
 654 /* --------------------------------------------------------------------------
 655                               FS Interface (/proc)
 656    -------------------------------------------------------------------------- */
 657
 658 static struct proc_dir_entry    *acpi_ec_dir;
 659
 660
 661 static int
 662 acpi_ec_read_info (struct seq_file *seq, void *offset)
 663 {
 664         struct acpi_ec          *ec = (struct acpi_ec *) seq->private;
 665
 666         ACPI_FUNCTION_TRACE("acpi_ec_read_info");
 667
 668         if (!ec)
 669                 goto end;
 670
 671         seq_printf(seq, "gpe bit:                 0x%02x\n",
 672                 (u32) ec->gpe_bit);
 673         seq_printf(seq, "ports:                   0x%02x, 0x%02x\n",
 674                 (u32) ec->status_addr.address, (u32) ec->data_addr.address);
 675         seq_printf(seq, "use global lock:         %s\n",
 676                 ec->global_lock?"yes":"no");
 677         acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
 678
 679 end:
 680         return_VALUE(0);
 681 }
 682
 683 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
 684 {
 685         return single_open(file, acpi_ec_read_info, PDE(inode)->data);
 686 }
 687
 688 static struct file_operations acpi_ec_info_ops = {
 689         .open           = acpi_ec_info_open_fs,
 690         .read           = seq_read,
 691         .llseek         = seq_lseek,
 692         .release        = single_release,
 693         .owner = THIS_MODULE,
 694 };
 695
 696 static int
 697 acpi_ec_add_fs (
 698         struct acpi_device      *device)
 699 {
 700         struct proc_dir_entry   *entry;
 701
 702         ACPI_FUNCTION_TRACE("acpi_ec_add_fs");
 703
 704         if (!acpi_device_dir(device)) {
 705                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 706                         acpi_ec_dir);
 707                 if (!acpi_device_dir(device))
 708                         return_VALUE(-ENODEV);
 709         }
 710
 711         entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
 712                 acpi_device_dir(device));
 713         if (!entry)
 714                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 715                         "Unable to create '%s' fs entry\n",
 716                         ACPI_EC_FILE_INFO));
 717         else {
 718                 entry->proc_fops = &acpi_ec_info_ops;
 719                 entry->data = acpi_driver_data(device);
 720                 entry->owner = THIS_MODULE;
 721         }
 722
 723         return_VALUE(0);
 724 }
 725
 726
 727 static int
 728 acpi_ec_remove_fs (
 729         struct acpi_device      *device)
 730 {
 731         ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");
 732
 733         if (acpi_device_dir(device)) {
 734                 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
 735                 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
 736                 acpi_device_dir(device) = NULL;
 737         }
 738
 739         return_VALUE(0);
 740 }
 741
 742
 743 /* --------------------------------------------------------------------------
 744                                Driver Interface
 745    -------------------------------------------------------------------------- */
 746
 747 static int
 748 acpi_ec_add (
 749         struct acpi_device      *device)
 750 {
 751         int                     result;
 752         acpi_status             status;
 753         struct acpi_ec          *ec;
 754         unsigned long           uid;
 755
 756         ACPI_FUNCTION_TRACE("acpi_ec_add");
 757
 758         if (!device)
 759                 return_VALUE(-EINVAL);
 760
 761         ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
 762         if (!ec)
 763                 return_VALUE(-ENOMEM);
 764         memset(ec, 0, sizeof(struct acpi_ec));
 765
 766         ec->handle = device->handle;
 767         ec->uid = -1;
 768         atomic_set(&ec->pending_gpe, 0);
 769         atomic_set(&ec->leaving_burst , 1);
 770         init_MUTEX(&ec->sem);
 771         init_waitqueue_head(&ec->wait);
 772         strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
 773         strcpy(acpi_device_class(device), ACPI_EC_CLASS);
 774         acpi_driver_data(device) = ec;
 775
 776         /* Use the global lock for all EC transactions? */
 777         acpi_evaluate_integer(ec->handle, "_GLK", NULL, &ec->global_lock);
 778
 779         /* If our UID matches the UID for the ECDT-enumerated EC,
 780            we now have the *real* EC info, so kill the makeshift one.*/
 781         acpi_evaluate_integer(ec->handle, "_UID", NULL, &uid);
 782         if (ec_ecdt && ec_ecdt->uid == uid) {
 783                 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
 784                         ACPI_ADR_SPACE_EC, &acpi_ec_space_handler);
 785
 786                 acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, &acpi_ec_gpe_handler);
 787
 788                 kfree(ec_ecdt);
 789         }
 790
 791         /* Get GPE bit assignment (EC events). */
 792         /* TODO: Add support for _GPE returning a package */
 793         status = acpi_evaluate_integer(ec->handle, "_GPE", NULL, &ec->gpe_bit);
 794         if (ACPI_FAILURE(status)) {
 795                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 796                         "Error obtaining GPE bit assignment\n"));
 797                 result = -ENODEV;
 798                 goto end;
 799         }
 800
 801         result = acpi_ec_add_fs(device);
 802         if (result)
 803                 goto end;
 804
 805         printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n",
 806                 acpi_device_name(device), acpi_device_bid(device),
 807                 (u32) ec->gpe_bit);
 808
 809         if (!first_ec)
 810                 first_ec = device;
 811
 812 end:
 813         if (result)
 814                 kfree(ec);
 815
 816         return_VALUE(result);
 817 }
 818
 819
 820 static int
 821 acpi_ec_remove (
 822         struct acpi_device      *device,
 823         int                     type)
 824 {
 825         struct acpi_ec          *ec;
 826
 827         ACPI_FUNCTION_TRACE("acpi_ec_remove");
 828
 829         if (!device)
 830                 return_VALUE(-EINVAL);
 831
 832         ec = acpi_driver_data(device);
 833
 834         acpi_ec_remove_fs(device);
 835
 836         kfree(ec);
 837
 838         return_VALUE(0);
 839 }
 840
 841
 842 static acpi_status
 843 acpi_ec_io_ports (
 844         struct acpi_resource    *resource,
 845         void                    *context)
 846 {
 847         struct acpi_ec          *ec = (struct acpi_ec *) context;
 848         struct acpi_generic_address *addr;
 849
 850         if (resource->id != ACPI_RSTYPE_IO) {
 851                 return AE_OK;
 852         }
 853
 854         /*
 855          * The first address region returned is the data port, and
 856          * the second address region returned is the status/command
 857          * port.
 858          */
 859         if (ec->data_addr.register_bit_width == 0) {
 860                 addr = &ec->data_addr;
 861         } else if (ec->command_addr.register_bit_width == 0) {
 862                 addr = &ec->command_addr;
 863         } else {
 864                 return AE_CTRL_TERMINATE;
 865         }
 866
 867         addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
 868         addr->register_bit_width = 8;
 869         addr->register_bit_offset = 0;
 870         addr->address = resource->data.io.min_base_address;
 871
 872         return AE_OK;
 873 }
 874
 875
 876 static int
 877 acpi_ec_start (
 878         struct acpi_device      *device)
 879 {
 880         acpi_status             status;
 881         struct acpi_ec          *ec;
 882
 883         ACPI_FUNCTION_TRACE("acpi_ec_start");
 884
 885         if (!device)
 886                 return_VALUE(-EINVAL);
 887
 888         ec = acpi_driver_data(device);
 889
 890         if (!ec)
 891                 return_VALUE(-EINVAL);
 892
 893         /*
 894          * Get I/O port addresses. Convert to GAS format.
 895          */
 896         status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS,
 897                 acpi_ec_io_ports, ec);
 898         if (ACPI_FAILURE(status) || ec->command_addr.register_bit_width == 0) {
 899                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error getting I/O port addresses"));
 900                 return_VALUE(-ENODEV);
 901         }
 902
 903         ec->status_addr = ec->command_addr;
 904
 905         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
 906                 (u32) ec->gpe_bit, (u32) ec->command_addr.address,
 907                 (u32) ec->data_addr.address));
 908
 909         /*
 910          * Install GPE handler
 911          */
 912         status = acpi_install_gpe_handler(NULL, ec->gpe_bit,
 913                 ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, ec);
 914         if (ACPI_FAILURE(status)) {
 915                 return_VALUE(-ENODEV);
 916         }
 917         acpi_set_gpe_type (NULL, ec->gpe_bit, ACPI_GPE_TYPE_RUNTIME);
 918         acpi_enable_gpe (NULL, ec->gpe_bit, ACPI_NOT_ISR);
 919
 920         status = acpi_install_address_space_handler (ec->handle,
 921                         ACPI_ADR_SPACE_EC, &acpi_ec_space_handler,
 922                         &acpi_ec_space_setup, ec);
 923         if (ACPI_FAILURE(status)) {
 924                 acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler);
 925                 return_VALUE(-ENODEV);
 926         }
 927
 928         return_VALUE(AE_OK);
 929 }
 930
 931
 932 static int
 933 acpi_ec_stop (
 934         struct acpi_device      *device,
 935         int                     type)
 936 {
 937         acpi_status             status;
 938         struct acpi_ec          *ec;
 939
 940         ACPI_FUNCTION_TRACE("acpi_ec_stop");
 941
 942         if (!device)
 943                 return_VALUE(-EINVAL);
 944
 945         ec = acpi_driver_data(device);
 946
 947         status = acpi_remove_address_space_handler(ec->handle,
 948                 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler);
 949         if (ACPI_FAILURE(status))
 950                 return_VALUE(-ENODEV);
 951
 952         status = acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler);
 953         if (ACPI_FAILURE(status))
 954                 return_VALUE(-ENODEV);
 955
 956         return_VALUE(0);
 957 }
 958
 959 static acpi_status __init
 960 acpi_fake_ecdt_callback (
 961         acpi_handle     handle,
 962         u32             Level,
 963         void            *context,
 964         void            **retval)
 965 {
 966         acpi_status     status;
 967
 968         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
 969                 acpi_ec_io_ports, ec_ecdt);
 970         if (ACPI_FAILURE(status))
 971                 return status;
 972         ec_ecdt->status_addr = ec_ecdt->command_addr;
 973
 974         ec_ecdt->uid = -1;
 975         acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid);
 976
 977         status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->gpe_bit);
 978         if (ACPI_FAILURE(status))
 979                 return status;
 980         ec_ecdt->global_lock = TRUE;
 981         ec_ecdt->handle = handle;
 982
 983         printk(KERN_INFO PREFIX  "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
 984                 (u32) ec_ecdt->gpe_bit, (u32) ec_ecdt->command_addr.address,
 985                 (u32) ec_ecdt->data_addr.address);
 986
 987         return AE_CTRL_TERMINATE;
 988 }
 989
 990 /*
 991  * Some BIOS (such as some from Gateway laptops) access EC region very early
 992  * such as in BAT0._INI or EC._INI before an EC device is found and
 993  * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
 994  * required, but if EC regison is accessed early, it is required.
 995  * The routine tries to workaround the BIOS bug by pre-scan EC device
 996  * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
 997  * op region (since _REG isn't invoked yet). The assumption is true for
 998  * all systems found.
 999  */
1000 static int __init
1001 acpi_ec_fake_ecdt(void)
1002 {
1003         acpi_status     status;
1004         int             ret = 0;
1005
1006         printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
1007
1008         ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
1009         if (!ec_ecdt) {
1010                 ret = -ENOMEM;
1011                 goto error;
1012         }
1013         memset(ec_ecdt, 0, sizeof(struct acpi_ec));
1014
1015         status = acpi_get_devices (ACPI_EC_HID,
1016                                 acpi_fake_ecdt_callback,
1017                                 NULL,
1018                                 NULL);
1019         if (ACPI_FAILURE(status)) {
1020                 kfree(ec_ecdt);
1021                 ec_ecdt = NULL;
1022                 ret = -ENODEV;
1023                 goto error;
1024         }
1025         return 0;
1026 error:
1027         printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
1028         return ret;
1029 }
1030
1031 static int __init
1032 acpi_ec_get_real_ecdt(void)
1033 {
1034         acpi_status             status;
1035         struct acpi_table_ecdt  *ecdt_ptr;
1036
1037         status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1038                 (struct acpi_table_header **) &ecdt_ptr);
1039         if (ACPI_FAILURE(status))
1040                 return -ENODEV;
1041
1042         printk(KERN_INFO PREFIX "Found ECDT\n");
1043
1044         /*
1045          * Generate a temporary ec context to use until the namespace is scanned
1046          */
1047         ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
1048         if (!ec_ecdt)
1049                 return -ENOMEM;
1050         memset(ec_ecdt, 0, sizeof(struct acpi_ec));
1051
1052         init_MUTEX(&ec_ecdt->sem);
1053         init_waitqueue_head(&ec_ecdt->wait);
1054         ec_ecdt->command_addr = ecdt_ptr->ec_control;
1055         ec_ecdt->status_addr = ecdt_ptr->ec_control;
1056         ec_ecdt->data_addr = ecdt_ptr->ec_data;
1057         ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit;
1058         /* use the GL just to be safe */
1059         ec_ecdt->global_lock = TRUE;
1060         ec_ecdt->uid = ecdt_ptr->uid;
1061
1062         status = acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle);
1063         if (ACPI_FAILURE(status)) {
1064                 goto error;
1065         }
1066
1067         return 0;
1068 error:
1069         printk(KERN_ERR PREFIX "Could not use ECDT\n");
1070         kfree(ec_ecdt);
1071         ec_ecdt = NULL;
1072
1073         return -ENODEV;
1074 }
1075
1076 static int __initdata acpi_fake_ecdt_enabled;
1077 int __init
1078 acpi_ec_ecdt_probe (void)
1079 {
1080         acpi_status             status;
1081         int                     ret;
1082
1083         ret = acpi_ec_get_real_ecdt();
1084         /* Try to make a fake ECDT */
1085         if (ret && acpi_fake_ecdt_enabled) {
1086                 ret = acpi_ec_fake_ecdt();
1087         }
1088
1089         if (ret)
1090                 return 0;
1091
1092         /*
1093          * Install GPE handler
1094          */
1095         status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe_bit,
1096                 ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler,
1097                 ec_ecdt);
1098         if (ACPI_FAILURE(status)) {
1099                 goto error;
1100         }
1101         acpi_set_gpe_type (NULL, ec_ecdt->gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1102         acpi_enable_gpe (NULL, ec_ecdt->gpe_bit, ACPI_NOT_ISR);
1103
1104         status = acpi_install_address_space_handler (ACPI_ROOT_OBJECT,
1105                         ACPI_ADR_SPACE_EC, &acpi_ec_space_handler,
1106                         &acpi_ec_space_setup, ec_ecdt);
1107         if (ACPI_FAILURE(status)) {
1108                 acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit,
1109                         &acpi_ec_gpe_handler);
1110                 goto error;
1111         }
1112
1113         return 0;
1114
1115 error:
1116         printk(KERN_ERR PREFIX "Could not use ECDT\n");
1117         kfree(ec_ecdt);
1118         ec_ecdt = NULL;
1119
1120         return -ENODEV;
1121 }
1122
1123
1124 static int __init acpi_ec_init (void)
1125 {
1126         int                     result;
1127
1128         ACPI_FUNCTION_TRACE("acpi_ec_init");
1129
1130         if (acpi_disabled)
1131                 return_VALUE(0);
1132
1133         acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1134         if (!acpi_ec_dir)
1135                 return_VALUE(-ENODEV);
1136
1137         /* Now register the driver for the EC */
1138         result = acpi_bus_register_driver(&acpi_ec_driver);
1139         if (result < 0) {
1140                 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1141                 return_VALUE(-ENODEV);
1142         }
1143
1144         return_VALUE(result);
1145 }
1146
1147 subsys_initcall(acpi_ec_init);
1148
1149 /* EC driver currently not unloadable */
1150 #if 0
1151 static void __exit
1152 acpi_ec_exit (void)
1153 {
1154         ACPI_FUNCTION_TRACE("acpi_ec_exit");
1155
1156         acpi_bus_unregister_driver(&acpi_ec_driver);
1157
1158         remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1159
1160         return_VOID;
1161 }
1162 #endif /* 0 */
1163
1164 static int __init acpi_fake_ecdt_setup(char *str)
1165 {
1166         acpi_fake_ecdt_enabled = 1;
1167         return 0;
1168 }
1169 __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);