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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 #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                 unsigned int 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                 spinlock_t lock;
 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, unsigned int event);
 125 static int acpi_ec_poll_read(union acpi_ec *ec, u8 address, u32 * data);
 126 static int acpi_ec_intr_read(union acpi_ec *ec, u8 address, u32 * data);
 127 static int acpi_ec_poll_write(union acpi_ec *ec, u8 address, u8 data);
 128 static int acpi_ec_intr_write(union acpi_ec *ec, u8 address, u8 data);
 129 static int acpi_ec_poll_query(union acpi_ec *ec, u32 * data);
 130 static int acpi_ec_intr_query(union acpi_ec *ec, u32 * data);
 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_wait(union acpi_ec *ec, u8 event)
 165 {
 166         if (acpi_ec_poll_mode)
 167                 return acpi_ec_poll_wait(ec, event);
 168         else
 169                 return acpi_ec_intr_wait(ec, event);
 170 }
 171
 172 static int acpi_ec_poll_wait(union acpi_ec *ec, u8 event)
 173 {
 174         u32 acpi_ec_status = 0;
 175         u32 i = ACPI_EC_UDELAY_COUNT;
 176
 177         if (!ec)
 178                 return -EINVAL;
 179
 180         /* Poll the EC status register waiting for the event to occur. */
 181         switch (event) {
 182         case ACPI_EC_EVENT_OBF:
 183                 do {
 184                         acpi_hw_low_level_read(8, &acpi_ec_status,
 185                                                &ec->common.status_addr);
 186                         if (acpi_ec_status & ACPI_EC_FLAG_OBF)
 187                                 return 0;
 188                         udelay(ACPI_EC_UDELAY);
 189                 } while (--i > 0);
 190                 break;
 191         case ACPI_EC_EVENT_IBE:
 192                 do {
 193                         acpi_hw_low_level_read(8, &acpi_ec_status,
 194                                                &ec->common.status_addr);
 195                         if (!(acpi_ec_status & ACPI_EC_FLAG_IBF))
 196                                 return 0;
 197                         udelay(ACPI_EC_UDELAY);
 198                 } while (--i > 0);
 199                 break;
 200         default:
 201                 return -EINVAL;
 202         }
 203
 204         return -ETIME;
 205 }
 206 static int acpi_ec_intr_wait(union acpi_ec *ec, unsigned int event)
 207 {
 208         int result = 0;
 209
 210         ACPI_FUNCTION_TRACE("acpi_ec_wait");
 211
 212         ec->intr.expect_event = event;
 213         smp_mb();
 214
 215         switch (event) {
 216         case ACPI_EC_EVENT_IBE:
 217                 if (~acpi_ec_read_status(ec) & event) {
 218                         ec->intr.expect_event = 0;
 219                         return_VALUE(0);
 220                 }
 221                 break;
 222         default:
 223                 break;
 224         }
 225
 226         result = wait_event_timeout(ec->intr.wait,
 227                                     !ec->intr.expect_event,
 228                                     msecs_to_jiffies(ACPI_EC_DELAY));
 229
 230         ec->intr.expect_event = 0;
 231         smp_mb();
 232
 233         /*
 234          * Verify that the event in question has actually happened by
 235          * querying EC status. Do the check even if operation timed-out
 236          * to make sure that we did not miss interrupt.
 237          */
 238         switch (event) {
 239         case ACPI_EC_EVENT_OBF:
 240                 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
 241                         return_VALUE(0);
 242                 break;
 243
 244         case ACPI_EC_EVENT_IBE:
 245                 if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
 246                         return_VALUE(0);
 247                 break;
 248         }
 249
 250         return_VALUE(-ETIME);
 251 }
 252
 253 #ifdef ACPI_FUTURE_USAGE
 254 /*
 255  * Note: samsung nv5000 doesn't work with ec burst mode.
 256  * http://bugzilla.kernel.org/show_bug.cgi?id=4980
 257  */
 258 int acpi_ec_enter_burst_mode(union acpi_ec *ec)
 259 {
 260         u32 tmp = 0;
 261         int status = 0;
 262
 263         ACPI_FUNCTION_TRACE("acpi_ec_enter_burst_mode");
 264
 265         status = acpi_ec_read_status(ec);
 266         if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
 267                 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 268                 if (status)
 269                         goto end;
 270                 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE,
 271                                         &ec->common.command_addr);
 272                 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
 273                 acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr);
 274                 if (tmp != 0x90) {      /* Burst ACK byte */
 275                         return_VALUE(-EINVAL);
 276                 }
 277         }
 278
 279         atomic_set(&ec->intr.leaving_burst, 0);
 280         return_VALUE(0);
 281       end:
 282         printk(KERN_WARNING PREFIX "Error in acpi_ec_wait\n");
 283         return_VALUE(-1);
 284 }
 285
 286 int acpi_ec_leave_burst_mode(union acpi_ec *ec)
 287 {
 288         int status = 0;
 289
 290         ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode");
 291
 292         status = acpi_ec_read_status(ec);
 293         if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){
 294                 status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
 295                 if(status)
 296                         goto end;
 297                 acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->common.command_addr);
 298                 acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
 299         }
 300         atomic_set(&ec->intr.leaving_burst, 1);
 301         return_VALUE(0);
 302 end:
 303         printk(KERN_WARNING PREFIX "leave burst_mode:error\n");
 304         return_VALUE(-1);
 305 }
 306 #endif /* ACPI_FUTURE_USAGE */
 307
 308 static int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data)
 309 {
 310         if (acpi_ec_poll_mode)
 311                 return acpi_ec_poll_read(ec, address, data);
 312         else
 313                 return acpi_ec_intr_read(ec, address, data);
 314 }
 315 static int acpi_ec_write(union acpi_ec *ec, u8 address, u8 data)
 316 {
 317         if (acpi_ec_poll_mode)
 318                 return acpi_ec_poll_write(ec, address, data);
 319         else
 320                 return acpi_ec_intr_write(ec, address, data);
 321 }
 322 static int acpi_ec_poll_read(union acpi_ec *ec, u8 address, u32 * data)
 323 {
 324         acpi_status status = AE_OK;
 325         int result = 0;
 326         unsigned long flags = 0;
 327         u32 glk = 0;
 328
 329         ACPI_FUNCTION_TRACE("acpi_ec_read");
 330
 331         if (!ec || !data)
 332                 return_VALUE(-EINVAL);
 333
 334         *data = 0;
 335
 336         if (ec->common.global_lock) {
 337                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 338                 if (ACPI_FAILURE(status))
 339                         return_VALUE(-ENODEV);
 340         }
 341
 342         spin_lock_irqsave(&ec->poll.lock, flags);
 343
 344         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
 345                                 &ec->common.command_addr);
 346         result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 347         if (result)
 348                 goto end;
 349
 350         acpi_hw_low_level_write(8, address, &ec->common.data_addr);
 351         result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
 352         if (result)
 353                 goto end;
 354
 355         acpi_hw_low_level_read(8, data, &ec->common.data_addr);
 356
 357         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
 358                           *data, address));
 359
 360       end:
 361         spin_unlock_irqrestore(&ec->poll.lock, flags);
 362
 363         if (ec->common.global_lock)
 364                 acpi_release_global_lock(glk);
 365
 366         return_VALUE(result);
 367 }
 368
 369 static int acpi_ec_poll_write(union acpi_ec *ec, u8 address, u8 data)
 370 {
 371         int result = 0;
 372         acpi_status status = AE_OK;
 373         unsigned long flags = 0;
 374         u32 glk = 0;
 375
 376         ACPI_FUNCTION_TRACE("acpi_ec_write");
 377
 378         if (!ec)
 379                 return_VALUE(-EINVAL);
 380
 381         if (ec->common.global_lock) {
 382                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 383                 if (ACPI_FAILURE(status))
 384                         return_VALUE(-ENODEV);
 385         }
 386
 387         spin_lock_irqsave(&ec->poll.lock, flags);
 388
 389         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
 390                                 &ec->common.command_addr);
 391         result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 392         if (result)
 393                 goto end;
 394
 395         acpi_hw_low_level_write(8, address, &ec->common.data_addr);
 396         result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 397         if (result)
 398                 goto end;
 399
 400         acpi_hw_low_level_write(8, data, &ec->common.data_addr);
 401         result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 402         if (result)
 403                 goto end;
 404
 405         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
 406                           data, address));
 407
 408       end:
 409         spin_unlock_irqrestore(&ec->poll.lock, flags);
 410
 411         if (ec->common.global_lock)
 412                 acpi_release_global_lock(glk);
 413
 414         return_VALUE(result);
 415 }
 416
 417 static int acpi_ec_intr_read(union acpi_ec *ec, u8 address, u32 * data)
 418 {
 419         int status = 0;
 420         u32 glk;
 421
 422         ACPI_FUNCTION_TRACE("acpi_ec_read");
 423
 424         if (!ec || !data)
 425                 return_VALUE(-EINVAL);
 426
 427         *data = 0;
 428
 429         if (ec->common.global_lock) {
 430                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 431                 if (ACPI_FAILURE(status))
 432                         return_VALUE(-ENODEV);
 433         }
 434
 435         WARN_ON(in_interrupt());
 436         down(&ec->intr.sem);
 437
 438         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 439         if (status) {
 440                 printk(KERN_DEBUG PREFIX "read EC, IB not empty\n");
 441                 goto end;
 442         }
 443         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
 444                                 &ec->common.command_addr);
 445         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 446         if (status) {
 447                 printk(KERN_DEBUG PREFIX "read EC, IB not empty\n");
 448         }
 449
 450         acpi_hw_low_level_write(8, address, &ec->common.data_addr);
 451         status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
 452         if (status) {
 453                 printk(KERN_DEBUG PREFIX "read EC, OB not full\n");
 454                 goto end;
 455         }
 456         acpi_hw_low_level_read(8, data, &ec->common.data_addr);
 457         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
 458                           *data, address));
 459
 460       end:
 461         up(&ec->intr.sem);
 462
 463         if (ec->common.global_lock)
 464                 acpi_release_global_lock(glk);
 465
 466         return_VALUE(status);
 467 }
 468
 469 static int acpi_ec_intr_write(union acpi_ec *ec, u8 address, u8 data)
 470 {
 471         int status = 0;
 472         u32 glk;
 473
 474         ACPI_FUNCTION_TRACE("acpi_ec_write");
 475
 476         if (!ec)
 477                 return_VALUE(-EINVAL);
 478
 479         if (ec->common.global_lock) {
 480                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 481                 if (ACPI_FAILURE(status))
 482                         return_VALUE(-ENODEV);
 483         }
 484
 485         WARN_ON(in_interrupt());
 486         down(&ec->intr.sem);
 487
 488         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 489         if (status) {
 490                 printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
 491         }
 492         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
 493                                 &ec->common.command_addr);
 494         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 495         if (status) {
 496                 printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
 497         }
 498
 499         acpi_hw_low_level_write(8, address, &ec->common.data_addr);
 500         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 501         if (status) {
 502                 printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
 503         }
 504
 505         acpi_hw_low_level_write(8, data, &ec->common.data_addr);
 506
 507         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
 508                           data, address));
 509
 510         up(&ec->intr.sem);
 511
 512         if (ec->common.global_lock)
 513                 acpi_release_global_lock(glk);
 514
 515         return_VALUE(status);
 516 }
 517
 518 /*
 519  * Externally callable EC access functions. For now, assume 1 EC only
 520  */
 521 int ec_read(u8 addr, u8 * val)
 522 {
 523         union acpi_ec *ec;
 524         int err;
 525         u32 temp_data;
 526
 527         if (!first_ec)
 528                 return -ENODEV;
 529
 530         ec = acpi_driver_data(first_ec);
 531
 532         err = acpi_ec_read(ec, addr, &temp_data);
 533
 534         if (!err) {
 535                 *val = temp_data;
 536                 return 0;
 537         } else
 538                 return err;
 539 }
 540
 541 EXPORT_SYMBOL(ec_read);
 542
 543 int ec_write(u8 addr, u8 val)
 544 {
 545         union acpi_ec *ec;
 546         int err;
 547
 548         if (!first_ec)
 549                 return -ENODEV;
 550
 551         ec = acpi_driver_data(first_ec);
 552
 553         err = acpi_ec_write(ec, addr, val);
 554
 555         return err;
 556 }
 557
 558 EXPORT_SYMBOL(ec_write);
 559
 560 static int acpi_ec_query(union acpi_ec *ec, u32 * data)
 561 {
 562         if (acpi_ec_poll_mode)
 563                 return acpi_ec_poll_query(ec, data);
 564         else
 565                 return acpi_ec_intr_query(ec, data);
 566 }
 567 static int acpi_ec_poll_query(union acpi_ec *ec, u32 * data)
 568 {
 569         int result = 0;
 570         acpi_status status = AE_OK;
 571         unsigned long flags = 0;
 572         u32 glk = 0;
 573
 574         ACPI_FUNCTION_TRACE("acpi_ec_query");
 575
 576         if (!ec || !data)
 577                 return_VALUE(-EINVAL);
 578
 579         *data = 0;
 580
 581         if (ec->common.global_lock) {
 582                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 583                 if (ACPI_FAILURE(status))
 584                         return_VALUE(-ENODEV);
 585         }
 586
 587         /*
 588          * Query the EC to find out which _Qxx method we need to evaluate.
 589          * Note that successful completion of the query causes the ACPI_EC_SCI
 590          * bit to be cleared (and thus clearing the interrupt source).
 591          */
 592         spin_lock_irqsave(&ec->poll.lock, flags);
 593
 594         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
 595                                 &ec->common.command_addr);
 596         result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
 597         if (result)
 598                 goto end;
 599
 600         acpi_hw_low_level_read(8, data, &ec->common.data_addr);
 601         if (!*data)
 602                 result = -ENODATA;
 603
 604       end:
 605         spin_unlock_irqrestore(&ec->poll.lock, flags);
 606
 607         if (ec->common.global_lock)
 608                 acpi_release_global_lock(glk);
 609
 610         return_VALUE(result);
 611 }
 612 static int acpi_ec_intr_query(union acpi_ec *ec, u32 * data)
 613 {
 614         int status = 0;
 615         u32 glk;
 616
 617         ACPI_FUNCTION_TRACE("acpi_ec_query");
 618
 619         if (!ec || !data)
 620                 return_VALUE(-EINVAL);
 621         *data = 0;
 622
 623         if (ec->common.global_lock) {
 624                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 625                 if (ACPI_FAILURE(status))
 626                         return_VALUE(-ENODEV);
 627         }
 628
 629         down(&ec->intr.sem);
 630
 631         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 632         if (status) {
 633                 printk(KERN_DEBUG PREFIX "query EC, IB not empty\n");
 634                 goto end;
 635         }
 636         /*
 637          * Query the EC to find out which _Qxx method we need to evaluate.
 638          * Note that successful completion of the query causes the ACPI_EC_SCI
 639          * bit to be cleared (and thus clearing the interrupt source).
 640          */
 641         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
 642                                 &ec->common.command_addr);
 643         status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
 644         if (status) {
 645                 printk(KERN_DEBUG PREFIX "query EC, OB not full\n");
 646                 goto end;
 647         }
 648
 649         acpi_hw_low_level_read(8, data, &ec->common.data_addr);
 650         if (!*data)
 651                 status = -ENODATA;
 652
 653       end:
 654         up(&ec->intr.sem);
 655
 656         if (ec->common.global_lock)
 657                 acpi_release_global_lock(glk);
 658
 659         return_VALUE(status);
 660 }
 661
 662 /* --------------------------------------------------------------------------
 663                                 Event Management
 664    -------------------------------------------------------------------------- */
 665
 666 union acpi_ec_query_data {
 667         acpi_handle handle;
 668         u8 data;
 669 };
 670
 671 static void acpi_ec_gpe_query(void *ec_cxt)
 672 {
 673         if (acpi_ec_poll_mode)
 674                 acpi_ec_gpe_poll_query(ec_cxt);
 675         else
 676                 acpi_ec_gpe_intr_query(ec_cxt);
 677 }
 678
 679 static void acpi_ec_gpe_poll_query(void *ec_cxt)
 680 {
 681         union acpi_ec *ec = (union acpi_ec *)ec_cxt;
 682         u32 value = 0;
 683         unsigned long flags = 0;
 684         static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
 685         const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
 686                 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
 687         };
 688
 689         ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
 690
 691         if (!ec_cxt)
 692                 goto end;
 693
 694         spin_lock_irqsave(&ec->poll.lock, flags);
 695         acpi_hw_low_level_read(8, &value, &ec->common.command_addr);
 696         spin_unlock_irqrestore(&ec->poll.lock, flags);
 697
 698         /* TBD: Implement asynch events!
 699          * NOTE: All we care about are EC-SCI's.  Other EC events are
 700          * handled via polling (yuck!).  This is because some systems
 701          * treat EC-SCIs as level (versus EDGE!) triggered, preventing
 702          *  a purely interrupt-driven approach (grumble, grumble).
 703          */
 704         if (!(value & ACPI_EC_FLAG_SCI))
 705                 goto end;
 706
 707         if (acpi_ec_query(ec, &value))
 708                 goto end;
 709
 710         object_name[2] = hex[((value >> 4) & 0x0F)];
 711         object_name[3] = hex[(value & 0x0F)];
 712
 713         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
 714
 715         acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
 716
 717       end:
 718         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
 719 }
 720 static void acpi_ec_gpe_intr_query(void *ec_cxt)
 721 {
 722         union acpi_ec *ec = (union acpi_ec *)ec_cxt;
 723         u32 value;
 724         int result = -ENODATA;
 725         static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
 726         const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
 727                 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
 728         };
 729
 730         ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
 731
 732         if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI)
 733                 result = acpi_ec_query(ec, &value);
 734
 735         if (result)
 736                 goto end;
 737
 738         object_name[2] = hex[((value >> 4) & 0x0F)];
 739         object_name[3] = hex[(value & 0x0F)];
 740
 741         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
 742
 743         acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
 744       end:
 745         atomic_dec(&ec->intr.pending_gpe);
 746         return;
 747 }
 748
 749 static u32 acpi_ec_gpe_handler(void *data)
 750 {
 751         if (acpi_ec_poll_mode)
 752                 return acpi_ec_gpe_poll_handler(data);
 753         else
 754                 return acpi_ec_gpe_intr_handler(data);
 755 }
 756 static u32 acpi_ec_gpe_poll_handler(void *data)
 757 {
 758         acpi_status status = AE_OK;
 759         union acpi_ec *ec = (union acpi_ec *)data;
 760
 761         if (!ec)
 762                 return ACPI_INTERRUPT_NOT_HANDLED;
 763
 764         acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
 765
 766         status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
 767                                              acpi_ec_gpe_query, ec);
 768
 769         if (status == AE_OK)
 770                 return ACPI_INTERRUPT_HANDLED;
 771         else
 772                 return ACPI_INTERRUPT_NOT_HANDLED;
 773 }
 774 static u32 acpi_ec_gpe_intr_handler(void *data)
 775 {
 776         acpi_status status = AE_OK;
 777         u32 value;
 778         union acpi_ec *ec = (union acpi_ec *)data;
 779
 780         if (!ec)
 781                 return ACPI_INTERRUPT_NOT_HANDLED;
 782
 783         acpi_clear_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
 784         value = acpi_ec_read_status(ec);
 785
 786         switch (ec->intr.expect_event) {
 787         case ACPI_EC_EVENT_OBF:
 788                 if (!(value & ACPI_EC_FLAG_OBF))
 789                         break;
 790         case ACPI_EC_EVENT_IBE:
 791                 if ((value & ACPI_EC_FLAG_IBF))
 792                         break;
 793                 ec->intr.expect_event = 0;
 794                 wake_up(&ec->intr.wait);
 795                 return ACPI_INTERRUPT_HANDLED;
 796         default:
 797                 break;
 798         }
 799
 800         if (value & ACPI_EC_FLAG_SCI) {
 801                 atomic_add(1, &ec->intr.pending_gpe);
 802                 status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
 803                                                      acpi_ec_gpe_query, ec);
 804                 return status == AE_OK ?
 805                     ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
 806         }
 807         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
 808         return status == AE_OK ?
 809             ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
 810 }
 811
 812 /* --------------------------------------------------------------------------
 813                              Address Space Management
 814    -------------------------------------------------------------------------- */
 815
 816 static acpi_status
 817 acpi_ec_space_setup(acpi_handle region_handle,
 818                     u32 function, void *handler_context, void **return_context)
 819 {
 820         /*
 821          * The EC object is in the handler context and is needed
 822          * when calling the acpi_ec_space_handler.
 823          */
 824         *return_context = (function != ACPI_REGION_DEACTIVATE) ?
 825             handler_context : NULL;
 826
 827         return AE_OK;
 828 }
 829
 830 static acpi_status
 831 acpi_ec_space_handler(u32 function,
 832                       acpi_physical_address address,
 833                       u32 bit_width,
 834                       acpi_integer * value,
 835                       void *handler_context, void *region_context)
 836 {
 837         int result = 0;
 838         union acpi_ec *ec = NULL;
 839         u64 temp = *value;
 840         acpi_integer f_v = 0;
 841         int i = 0;
 842
 843         ACPI_FUNCTION_TRACE("acpi_ec_space_handler");
 844
 845         if ((address > 0xFF) || !value || !handler_context)
 846                 return_VALUE(AE_BAD_PARAMETER);
 847
 848         if (bit_width != 8 && acpi_strict) {
 849                 printk(KERN_WARNING PREFIX
 850                        "acpi_ec_space_handler: bit_width should be 8\n");
 851                 return_VALUE(AE_BAD_PARAMETER);
 852         }
 853
 854         ec = (union acpi_ec *)handler_context;
 855
 856       next_byte:
 857         switch (function) {
 858         case ACPI_READ:
 859                 temp = 0;
 860                 result = acpi_ec_read(ec, (u8) address, (u32 *) & temp);
 861                 break;
 862         case ACPI_WRITE:
 863                 result = acpi_ec_write(ec, (u8) address, (u8) temp);
 864                 break;
 865         default:
 866                 result = -EINVAL;
 867                 goto out;
 868                 break;
 869         }
 870
 871         bit_width -= 8;
 872         if (bit_width) {
 873                 if (function == ACPI_READ)
 874                         f_v |= temp << 8 * i;
 875                 if (function == ACPI_WRITE)
 876                         temp >>= 8;
 877                 i++;
 878                 address++;
 879                 goto next_byte;
 880         }
 881
 882         if (function == ACPI_READ) {
 883                 f_v |= temp << 8 * i;
 884                 *value = f_v;
 885         }
 886
 887       out:
 888         switch (result) {
 889         case -EINVAL:
 890                 return_VALUE(AE_BAD_PARAMETER);
 891                 break;
 892         case -ENODEV:
 893                 return_VALUE(AE_NOT_FOUND);
 894                 break;
 895         case -ETIME:
 896                 return_VALUE(AE_TIME);
 897                 break;
 898         default:
 899                 return_VALUE(AE_OK);
 900         }
 901 }
 902
 903 /* --------------------------------------------------------------------------
 904                               FS Interface (/proc)
 905    -------------------------------------------------------------------------- */
 906
 907 static struct proc_dir_entry *acpi_ec_dir;
 908
 909 static int acpi_ec_read_info(struct seq_file *seq, void *offset)
 910 {
 911         union acpi_ec *ec = (union acpi_ec *)seq->private;
 912
 913         ACPI_FUNCTION_TRACE("acpi_ec_read_info");
 914
 915         if (!ec)
 916                 goto end;
 917
 918         seq_printf(seq, "gpe bit:                 0x%02x\n",
 919                    (u32) ec->common.gpe_bit);
 920         seq_printf(seq, "ports:                   0x%02x, 0x%02x\n",
 921                    (u32) ec->common.status_addr.address,
 922                    (u32) ec->common.data_addr.address);
 923         seq_printf(seq, "use global lock:         %s\n",
 924                    ec->common.global_lock ? "yes" : "no");
 925         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
 926
 927       end:
 928         return_VALUE(0);
 929 }
 930
 931 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
 932 {
 933         return single_open(file, acpi_ec_read_info, PDE(inode)->data);
 934 }
 935
 936 static struct file_operations acpi_ec_info_ops = {
 937         .open = acpi_ec_info_open_fs,
 938         .read = seq_read,
 939         .llseek = seq_lseek,
 940         .release = single_release,
 941         .owner = THIS_MODULE,
 942 };
 943
 944 static int acpi_ec_add_fs(struct acpi_device *device)
 945 {
 946         struct proc_dir_entry *entry = NULL;
 947
 948         ACPI_FUNCTION_TRACE("acpi_ec_add_fs");
 949
 950         if (!acpi_device_dir(device)) {
 951                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 952                                                      acpi_ec_dir);
 953                 if (!acpi_device_dir(device))
 954                         return_VALUE(-ENODEV);
 955         }
 956
 957         entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
 958                                   acpi_device_dir(device));
 959         if (!entry)
 960                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 961                                   "Unable to create '%s' fs entry\n",
 962                                   ACPI_EC_FILE_INFO));
 963         else {
 964                 entry->proc_fops = &acpi_ec_info_ops;
 965                 entry->data = acpi_driver_data(device);
 966                 entry->owner = THIS_MODULE;
 967         }
 968
 969         return_VALUE(0);
 970 }
 971
 972 static int acpi_ec_remove_fs(struct acpi_device *device)
 973 {
 974         ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");
 975
 976         if (acpi_device_dir(device)) {
 977                 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
 978                 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
 979                 acpi_device_dir(device) = NULL;
 980         }
 981
 982         return_VALUE(0);
 983 }
 984
 985 /* --------------------------------------------------------------------------
 986                                Driver Interface
 987    -------------------------------------------------------------------------- */
 988
 989 static int acpi_ec_poll_add(struct acpi_device *device)
 990 {
 991         int result = 0;
 992         acpi_status status = AE_OK;
 993         union acpi_ec *ec = NULL;
 994         unsigned long uid;
 995
 996         ACPI_FUNCTION_TRACE("acpi_ec_add");
 997
 998         if (!device)
 999                 return_VALUE(-EINVAL);
1000
1001         ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1002         if (!ec)
1003                 return_VALUE(-ENOMEM);
1004         memset(ec, 0, sizeof(union acpi_ec));
1005
1006         ec->common.handle = device->handle;
1007         ec->common.uid = -1;
1008         spin_lock_init(&ec->poll.lock);
1009         strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
1010         strcpy(acpi_device_class(device), ACPI_EC_CLASS);
1011         acpi_driver_data(device) = ec;
1012
1013         /* Use the global lock for all EC transactions? */
1014         acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1015                               &ec->common.global_lock);
1016
1017         /* If our UID matches the UID for the ECDT-enumerated EC,
1018            we now have the *real* EC info, so kill the makeshift one. */
1019         acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid);
1020         if (ec_ecdt && ec_ecdt->common.uid == uid) {
1021                 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
1022                                                   ACPI_ADR_SPACE_EC,
1023                                                   &acpi_ec_space_handler);
1024
1025                 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1026                                         &acpi_ec_gpe_handler);
1027
1028                 kfree(ec_ecdt);
1029         }
1030
1031         /* Get GPE bit assignment (EC events). */
1032         /* TODO: Add support for _GPE returning a package */
1033         status =
1034             acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1035                                   &ec->common.gpe_bit);
1036         if (ACPI_FAILURE(status)) {
1037                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1038                                   "Error obtaining GPE bit assignment\n"));
1039                 result = -ENODEV;
1040                 goto end;
1041         }
1042
1043         result = acpi_ec_add_fs(device);
1044         if (result)
1045                 goto end;
1046
1047         printk(KERN_INFO PREFIX "%s [%s] (gpe %d) polling mode.\n",
1048                acpi_device_name(device), acpi_device_bid(device),
1049                (u32) ec->common.gpe_bit);
1050
1051         if (!first_ec)
1052                 first_ec = device;
1053
1054       end:
1055         if (result)
1056                 kfree(ec);
1057
1058         return_VALUE(result);
1059 }
1060 static int acpi_ec_intr_add(struct acpi_device *device)
1061 {
1062         int result = 0;
1063         acpi_status status = AE_OK;
1064         union acpi_ec *ec = NULL;
1065         unsigned long uid;
1066
1067         ACPI_FUNCTION_TRACE("acpi_ec_add");
1068
1069         if (!device)
1070                 return_VALUE(-EINVAL);
1071
1072         ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1073         if (!ec)
1074                 return_VALUE(-ENOMEM);
1075         memset(ec, 0, sizeof(union acpi_ec));
1076
1077         ec->common.handle = device->handle;
1078         ec->common.uid = -1;
1079         atomic_set(&ec->intr.pending_gpe, 0);
1080         atomic_set(&ec->intr.leaving_burst, 1);
1081         init_MUTEX(&ec->intr.sem);
1082         init_waitqueue_head(&ec->intr.wait);
1083         strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
1084         strcpy(acpi_device_class(device), ACPI_EC_CLASS);
1085         acpi_driver_data(device) = ec;
1086
1087         /* Use the global lock for all EC transactions? */
1088         acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1089                               &ec->common.global_lock);
1090
1091         /* If our UID matches the UID for the ECDT-enumerated EC,
1092            we now have the *real* EC info, so kill the makeshift one. */
1093         acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid);
1094         if (ec_ecdt && ec_ecdt->common.uid == uid) {
1095                 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
1096                                                   ACPI_ADR_SPACE_EC,
1097                                                   &acpi_ec_space_handler);
1098
1099                 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1100                                         &acpi_ec_gpe_handler);
1101
1102                 kfree(ec_ecdt);
1103         }
1104
1105         /* Get GPE bit assignment (EC events). */
1106         /* TODO: Add support for _GPE returning a package */
1107         status =
1108             acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1109                                   &ec->common.gpe_bit);
1110         if (ACPI_FAILURE(status)) {
1111                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1112                                   "Error obtaining GPE bit assignment\n"));
1113                 result = -ENODEV;
1114                 goto end;
1115         }
1116
1117         result = acpi_ec_add_fs(device);
1118         if (result)
1119                 goto end;
1120
1121         printk(KERN_INFO PREFIX "%s [%s] (gpe %d) interrupt mode.\n",
1122                acpi_device_name(device), acpi_device_bid(device),
1123                (u32) ec->common.gpe_bit);
1124
1125         if (!first_ec)
1126                 first_ec = device;
1127
1128       end:
1129         if (result)
1130                 kfree(ec);
1131
1132         return_VALUE(result);
1133 }
1134
1135 static int acpi_ec_remove(struct acpi_device *device, int type)
1136 {
1137         union acpi_ec *ec = NULL;
1138
1139         ACPI_FUNCTION_TRACE("acpi_ec_remove");
1140
1141         if (!device)
1142                 return_VALUE(-EINVAL);
1143
1144         ec = acpi_driver_data(device);
1145
1146         acpi_ec_remove_fs(device);
1147
1148         kfree(ec);
1149
1150         return_VALUE(0);
1151 }
1152
1153 static acpi_status
1154 acpi_ec_io_ports(struct acpi_resource *resource, void *context)
1155 {
1156         union acpi_ec *ec = (union acpi_ec *)context;
1157         struct acpi_generic_address *addr;
1158
1159         if (resource->type != ACPI_RESOURCE_TYPE_IO) {
1160                 return AE_OK;
1161         }
1162
1163         /*
1164          * The first address region returned is the data port, and
1165          * the second address region returned is the status/command
1166          * port.
1167          */
1168         if (ec->common.data_addr.register_bit_width == 0) {
1169                 addr = &ec->common.data_addr;
1170         } else if (ec->common.command_addr.register_bit_width == 0) {
1171                 addr = &ec->common.command_addr;
1172         } else {
1173                 return AE_CTRL_TERMINATE;
1174         }
1175
1176         addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1177         addr->register_bit_width = 8;
1178         addr->register_bit_offset = 0;
1179         addr->address = resource->data.io.minimum;
1180
1181         return AE_OK;
1182 }
1183
1184 static int acpi_ec_start(struct acpi_device *device)
1185 {
1186         acpi_status status = AE_OK;
1187         union acpi_ec *ec = NULL;
1188
1189         ACPI_FUNCTION_TRACE("acpi_ec_start");
1190
1191         if (!device)
1192                 return_VALUE(-EINVAL);
1193
1194         ec = acpi_driver_data(device);
1195
1196         if (!ec)
1197                 return_VALUE(-EINVAL);
1198
1199         /*
1200          * Get I/O port addresses. Convert to GAS format.
1201          */
1202         status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS,
1203                                      acpi_ec_io_ports, ec);
1204         if (ACPI_FAILURE(status)
1205             || ec->common.command_addr.register_bit_width == 0) {
1206                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1207                                   "Error getting I/O port addresses"));
1208                 return_VALUE(-ENODEV);
1209         }
1210
1211         ec->common.status_addr = ec->common.command_addr;
1212
1213         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
1214                           (u32) ec->common.gpe_bit,
1215                           (u32) ec->common.command_addr.address,
1216                           (u32) ec->common.data_addr.address));
1217
1218         /*
1219          * Install GPE handler
1220          */
1221         status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit,
1222                                           ACPI_GPE_EDGE_TRIGGERED,
1223                                           &acpi_ec_gpe_handler, ec);
1224         if (ACPI_FAILURE(status)) {
1225                 return_VALUE(-ENODEV);
1226         }
1227         acpi_set_gpe_type(NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1228         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
1229
1230         status = acpi_install_address_space_handler(ec->common.handle,
1231                                                     ACPI_ADR_SPACE_EC,
1232                                                     &acpi_ec_space_handler,
1233                                                     &acpi_ec_space_setup, ec);
1234         if (ACPI_FAILURE(status)) {
1235                 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1236                                         &acpi_ec_gpe_handler);
1237                 return_VALUE(-ENODEV);
1238         }
1239
1240         return_VALUE(AE_OK);
1241 }
1242
1243 static int acpi_ec_stop(struct acpi_device *device, int type)
1244 {
1245         acpi_status status = AE_OK;
1246         union acpi_ec *ec = NULL;
1247
1248         ACPI_FUNCTION_TRACE("acpi_ec_stop");
1249
1250         if (!device)
1251                 return_VALUE(-EINVAL);
1252
1253         ec = acpi_driver_data(device);
1254
1255         status = acpi_remove_address_space_handler(ec->common.handle,
1256                                                    ACPI_ADR_SPACE_EC,
1257                                                    &acpi_ec_space_handler);
1258         if (ACPI_FAILURE(status))
1259                 return_VALUE(-ENODEV);
1260
1261         status =
1262             acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1263                                     &acpi_ec_gpe_handler);
1264         if (ACPI_FAILURE(status))
1265                 return_VALUE(-ENODEV);
1266
1267         return_VALUE(0);
1268 }
1269
1270 static acpi_status __init
1271 acpi_fake_ecdt_callback(acpi_handle handle,
1272                         u32 Level, void *context, void **retval)
1273 {
1274
1275         if (acpi_ec_poll_mode)
1276                 return acpi_fake_ecdt_poll_callback(handle,
1277                                                        Level, context, retval);
1278         else
1279                 return acpi_fake_ecdt_intr_callback(handle,
1280                                                      Level, context, retval);
1281 }
1282
1283 static acpi_status __init
1284 acpi_fake_ecdt_poll_callback(acpi_handle handle,
1285                                 u32 Level, void *context, void **retval)
1286 {
1287         acpi_status status;
1288
1289         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1290                                      acpi_ec_io_ports, ec_ecdt);
1291         if (ACPI_FAILURE(status))
1292                 return status;
1293         ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1294
1295         ec_ecdt->common.uid = -1;
1296         acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1297
1298         status =
1299             acpi_evaluate_integer(handle, "_GPE", NULL,
1300                                   &ec_ecdt->common.gpe_bit);
1301         if (ACPI_FAILURE(status))
1302                 return status;
1303         spin_lock_init(&ec_ecdt->poll.lock);
1304         ec_ecdt->common.global_lock = TRUE;
1305         ec_ecdt->common.handle = handle;
1306
1307         printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1308                (u32) ec_ecdt->common.gpe_bit,
1309                (u32) ec_ecdt->common.command_addr.address,
1310                (u32) ec_ecdt->common.data_addr.address);
1311
1312         return AE_CTRL_TERMINATE;
1313 }
1314
1315 static acpi_status __init
1316 acpi_fake_ecdt_intr_callback(acpi_handle handle,
1317                               u32 Level, void *context, void **retval)
1318 {
1319         acpi_status status;
1320
1321         init_MUTEX(&ec_ecdt->intr.sem);
1322         init_waitqueue_head(&ec_ecdt->intr.wait);
1323         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1324                                      acpi_ec_io_ports, ec_ecdt);
1325         if (ACPI_FAILURE(status))
1326                 return status;
1327         ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1328
1329         ec_ecdt->common.uid = -1;
1330         acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1331
1332         status =
1333             acpi_evaluate_integer(handle, "_GPE", NULL,
1334                                   &ec_ecdt->common.gpe_bit);
1335         if (ACPI_FAILURE(status))
1336                 return status;
1337         ec_ecdt->common.global_lock = TRUE;
1338         ec_ecdt->common.handle = handle;
1339
1340         printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1341                (u32) ec_ecdt->common.gpe_bit,
1342                (u32) ec_ecdt->common.command_addr.address,
1343                (u32) ec_ecdt->common.data_addr.address);
1344
1345         return AE_CTRL_TERMINATE;
1346 }
1347
1348 /*
1349  * Some BIOS (such as some from Gateway laptops) access EC region very early
1350  * such as in BAT0._INI or EC._INI before an EC device is found and
1351  * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
1352  * required, but if EC regison is accessed early, it is required.
1353  * The routine tries to workaround the BIOS bug by pre-scan EC device
1354  * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
1355  * op region (since _REG isn't invoked yet). The assumption is true for
1356  * all systems found.
1357  */
1358 static int __init acpi_ec_fake_ecdt(void)
1359 {
1360         acpi_status status;
1361         int ret = 0;
1362
1363         printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
1364
1365         ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1366         if (!ec_ecdt) {
1367                 ret = -ENOMEM;
1368                 goto error;
1369         }
1370         memset(ec_ecdt, 0, sizeof(union acpi_ec));
1371
1372         status = acpi_get_devices(ACPI_EC_HID,
1373                                   acpi_fake_ecdt_callback, NULL, NULL);
1374         if (ACPI_FAILURE(status)) {
1375                 kfree(ec_ecdt);
1376                 ec_ecdt = NULL;
1377                 ret = -ENODEV;
1378                 goto error;
1379         }
1380         return 0;
1381       error:
1382         printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
1383         return ret;
1384 }
1385
1386 static int __init acpi_ec_get_real_ecdt(void)
1387 {
1388         if (acpi_ec_poll_mode)
1389                 return acpi_ec_poll_get_real_ecdt();
1390         else
1391                 return acpi_ec_intr_get_real_ecdt();
1392 }
1393
1394 static int __init acpi_ec_poll_get_real_ecdt(void)
1395 {
1396         acpi_status status;
1397         struct acpi_table_ecdt *ecdt_ptr;
1398
1399         status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1400                                          (struct acpi_table_header **)
1401                                          &ecdt_ptr);
1402         if (ACPI_FAILURE(status))
1403                 return -ENODEV;
1404
1405         printk(KERN_INFO PREFIX "Found ECDT\n");
1406
1407         /*
1408          * Generate a temporary ec context to use until the namespace is scanned
1409          */
1410         ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1411         if (!ec_ecdt)
1412                 return -ENOMEM;
1413         memset(ec_ecdt, 0, sizeof(union acpi_ec));
1414
1415         ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1416         ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1417         ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1418         ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1419         spin_lock_init(&ec_ecdt->poll.lock);
1420         /* use the GL just to be safe */
1421         ec_ecdt->common.global_lock = TRUE;
1422         ec_ecdt->common.uid = ecdt_ptr->uid;
1423
1424         status =
1425             acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1426         if (ACPI_FAILURE(status)) {
1427                 goto error;
1428         }
1429
1430         return 0;
1431       error:
1432         printk(KERN_ERR PREFIX "Could not use ECDT\n");
1433         kfree(ec_ecdt);
1434         ec_ecdt = NULL;
1435
1436         return -ENODEV;
1437 }
1438
1439 static int __init acpi_ec_intr_get_real_ecdt(void)
1440 {
1441         acpi_status status;
1442         struct acpi_table_ecdt *ecdt_ptr;
1443
1444         status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1445                                          (struct acpi_table_header **)
1446                                          &ecdt_ptr);
1447         if (ACPI_FAILURE(status))
1448                 return -ENODEV;
1449
1450         printk(KERN_INFO PREFIX "Found ECDT\n");
1451
1452         /*
1453          * Generate a temporary ec context to use until the namespace is scanned
1454          */
1455         ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1456         if (!ec_ecdt)
1457                 return -ENOMEM;
1458         memset(ec_ecdt, 0, sizeof(union acpi_ec));
1459
1460         init_MUTEX(&ec_ecdt->intr.sem);
1461         init_waitqueue_head(&ec_ecdt->intr.wait);
1462         ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1463         ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1464         ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1465         ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1466         /* use the GL just to be safe */
1467         ec_ecdt->common.global_lock = TRUE;
1468         ec_ecdt->common.uid = ecdt_ptr->uid;
1469
1470         status =
1471             acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1472         if (ACPI_FAILURE(status)) {
1473                 goto error;
1474         }
1475
1476         return 0;
1477       error:
1478         printk(KERN_ERR PREFIX "Could not use ECDT\n");
1479         kfree(ec_ecdt);
1480         ec_ecdt = NULL;
1481
1482         return -ENODEV;
1483 }
1484
1485 static int __initdata acpi_fake_ecdt_enabled;
1486 int __init acpi_ec_ecdt_probe(void)
1487 {
1488         acpi_status status;
1489         int ret;
1490
1491         ret = acpi_ec_get_real_ecdt();
1492         /* Try to make a fake ECDT */
1493         if (ret && acpi_fake_ecdt_enabled) {
1494                 ret = acpi_ec_fake_ecdt();
1495         }
1496
1497         if (ret)
1498                 return 0;
1499
1500         /*
1501          * Install GPE handler
1502          */
1503         status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1504                                           ACPI_GPE_EDGE_TRIGGERED,
1505                                           &acpi_ec_gpe_handler, ec_ecdt);
1506         if (ACPI_FAILURE(status)) {
1507                 goto error;
1508         }
1509         acpi_set_gpe_type(NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1510         acpi_enable_gpe(NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR);
1511
1512         status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
1513                                                     ACPI_ADR_SPACE_EC,
1514                                                     &acpi_ec_space_handler,
1515                                                     &acpi_ec_space_setup,
1516                                                     ec_ecdt);
1517         if (ACPI_FAILURE(status)) {
1518                 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1519                                         &acpi_ec_gpe_handler);
1520                 goto error;
1521         }
1522
1523         return 0;
1524
1525       error:
1526         printk(KERN_ERR PREFIX "Could not use ECDT\n");
1527         kfree(ec_ecdt);
1528         ec_ecdt = NULL;
1529
1530         return -ENODEV;
1531 }
1532
1533 static int __init acpi_ec_init(void)
1534 {
1535         int result = 0;
1536
1537         ACPI_FUNCTION_TRACE("acpi_ec_init");
1538
1539         if (acpi_disabled)
1540                 return_VALUE(0);
1541
1542         acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1543         if (!acpi_ec_dir)
1544                 return_VALUE(-ENODEV);
1545
1546         /* Now register the driver for the EC */
1547         result = acpi_bus_register_driver(&acpi_ec_driver);
1548         if (result < 0) {
1549                 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1550                 return_VALUE(-ENODEV);
1551         }
1552
1553         return_VALUE(result);
1554 }
1555
1556 subsys_initcall(acpi_ec_init);
1557
1558 /* EC driver currently not unloadable */
1559 #if 0
1560 static void __exit acpi_ec_exit(void)
1561 {
1562         ACPI_FUNCTION_TRACE("acpi_ec_exit");
1563
1564         acpi_bus_unregister_driver(&acpi_ec_driver);
1565
1566         remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1567
1568         return_VOID;
1569 }
1570 #endif                          /* 0 */
1571
1572 static int __init acpi_fake_ecdt_setup(char *str)
1573 {
1574         acpi_fake_ecdt_enabled = 1;
1575         return 0;
1576 }
1577
1578 __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
1579 static int __init acpi_ec_set_intr_mode(char *str)
1580 {
1581         int intr;
1582
1583         if (!get_option(&str, &intr))
1584                 return 0;
1585
1586         if (intr) {
1587                 acpi_ec_poll_mode = EC_INTR;
1588                 acpi_ec_driver.ops.add = acpi_ec_intr_add;
1589         } else {
1590                 acpi_ec_poll_mode = EC_POLL;
1591                 acpi_ec_driver.ops.add = acpi_ec_poll_add;
1592         }
1593         printk(KERN_INFO PREFIX "EC %s mode.\n", intr ? "interrupt" : "polling");
1594         return 0;
1595 }
1596
1597 __setup("ec_intr=", acpi_ec_set_intr_mode);