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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_POLLING              0xFF
  64 #define EC_BURST                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_burst_add(struct acpi_device *device);
  69 static int acpi_ec_polling_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_polling_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         } burst;
 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         } polling;
 121 };
 122
 123 static int acpi_ec_polling_wait(union acpi_ec *ec, u8 event);
 124 static int acpi_ec_burst_wait(union acpi_ec *ec, unsigned int event);
 125 static int acpi_ec_polling_read(union acpi_ec *ec, u8 address, u32 * data);
 126 static int acpi_ec_burst_read(union acpi_ec *ec, u8 address, u32 * data);
 127 static int acpi_ec_polling_write(union acpi_ec *ec, u8 address, u8 data);
 128 static int acpi_ec_burst_write(union acpi_ec *ec, u8 address, u8 data);
 129 static int acpi_ec_polling_query(union acpi_ec *ec, u32 * data);
 130 static int acpi_ec_burst_query(union acpi_ec *ec, u32 * data);
 131 static void acpi_ec_gpe_polling_query(void *ec_cxt);
 132 static void acpi_ec_gpe_burst_query(void *ec_cxt);
 133 static u32 acpi_ec_gpe_polling_handler(void *data);
 134 static u32 acpi_ec_gpe_burst_handler(void *data);
 135 static acpi_status __init
 136 acpi_fake_ecdt_polling_callback(acpi_handle handle,
 137                                 u32 Level, void *context, void **retval);
 138
 139 static acpi_status __init
 140 acpi_fake_ecdt_burst_callback(acpi_handle handle,
 141                               u32 Level, void *context, void **retval);
 142
 143 static int __init acpi_ec_polling_get_real_ecdt(void);
 144 static int __init acpi_ec_burst_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_polling_mode = EC_POLLING;
 151
 152 /* --------------------------------------------------------------------------
 153                              Transaction Management
 154    -------------------------------------------------------------------------- */
 155
 156 static inline 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_polling_mode)
 167                 return acpi_ec_polling_wait(ec, event);
 168         else
 169                 return acpi_ec_burst_wait(ec, event);
 170 }
 171
 172 static int acpi_ec_polling_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_burst_wait(union acpi_ec *ec, unsigned int event)
 207 {
 208         int result = 0;
 209
 210         ACPI_FUNCTION_TRACE("acpi_ec_wait");
 211
 212         ec->burst.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->burst.expect_event = 0;
 219                         return_VALUE(0);
 220                 }
 221                 break;
 222         default:
 223                 break;
 224         }
 225
 226         result = wait_event_timeout(ec->burst.wait,
 227                                     !ec->burst.expect_event,
 228                                     msecs_to_jiffies(ACPI_EC_DELAY));
 229
 230         ec->burst.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 /*
 254  * Note: samsung nv5000 doesn't work with ec burst mode.
 255  * http://bugzilla.kernel.org/show_bug.cgi?id=4980
 256  */
 257 int acpi_ec_enter_burst_mode(union acpi_ec *ec)
 258 {
 259         u32 tmp = 0;
 260         int status = 0;
 261
 262         ACPI_FUNCTION_TRACE("acpi_ec_enter_burst_mode");
 263
 264         status = acpi_ec_read_status(ec);
 265         if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
 266                 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 267                 if (status)
 268                         goto end;
 269                 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE,
 270                                         &ec->common.command_addr);
 271                 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
 272                 acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr);
 273                 if (tmp != 0x90) {      /* Burst ACK byte */
 274                         return_VALUE(-EINVAL);
 275                 }
 276         }
 277
 278         atomic_set(&ec->burst.leaving_burst, 0);
 279         return_VALUE(0);
 280       end:
 281         printk("Error in acpi_ec_wait\n");
 282         return_VALUE(-1);
 283 }
 284
 285 int acpi_ec_leave_burst_mode(union acpi_ec *ec)
 286 {
 287         int status = 0;
 288
 289         ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode");
 290
 291         status = acpi_ec_read_status(ec);
 292         if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){
 293                 status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
 294                 if(status)
 295                         goto end;
 296                 acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->common.command_addr);
 297                 acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
 298         }
 299         atomic_set(&ec->burst.leaving_burst, 1);
 300         return_VALUE(0);
 301 end:
 302         printk("leave burst_mode:error \n");
 303         return_VALUE(-1);
 304 }
 305
 306 static int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data)
 307 {
 308         if (acpi_ec_polling_mode)
 309                 return acpi_ec_polling_read(ec, address, data);
 310         else
 311                 return acpi_ec_burst_read(ec, address, data);
 312 }
 313 static int acpi_ec_write(union acpi_ec *ec, u8 address, u8 data)
 314 {
 315         if (acpi_ec_polling_mode)
 316                 return acpi_ec_polling_write(ec, address, data);
 317         else
 318                 return acpi_ec_burst_write(ec, address, data);
 319 }
 320 static int acpi_ec_polling_read(union acpi_ec *ec, u8 address, u32 * data)
 321 {
 322         acpi_status status = AE_OK;
 323         int result = 0;
 324         unsigned long flags = 0;
 325         u32 glk = 0;
 326
 327         ACPI_FUNCTION_TRACE("acpi_ec_read");
 328
 329         if (!ec || !data)
 330                 return_VALUE(-EINVAL);
 331
 332         *data = 0;
 333
 334         if (ec->common.global_lock) {
 335                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 336                 if (ACPI_FAILURE(status))
 337                         return_VALUE(-ENODEV);
 338         }
 339
 340         spin_lock_irqsave(&ec->polling.lock, flags);
 341
 342         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
 343                                 &ec->common.command_addr);
 344         result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 345         if (result)
 346                 goto end;
 347
 348         acpi_hw_low_level_write(8, address, &ec->common.data_addr);
 349         result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
 350         if (result)
 351                 goto end;
 352
 353         acpi_hw_low_level_read(8, data, &ec->common.data_addr);
 354
 355         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
 356                           *data, address));
 357
 358       end:
 359         spin_unlock_irqrestore(&ec->polling.lock, flags);
 360
 361         if (ec->common.global_lock)
 362                 acpi_release_global_lock(glk);
 363
 364         return_VALUE(result);
 365 }
 366
 367 static int acpi_ec_polling_write(union acpi_ec *ec, u8 address, u8 data)
 368 {
 369         int result = 0;
 370         acpi_status status = AE_OK;
 371         unsigned long flags = 0;
 372         u32 glk = 0;
 373
 374         ACPI_FUNCTION_TRACE("acpi_ec_write");
 375
 376         if (!ec)
 377                 return_VALUE(-EINVAL);
 378
 379         if (ec->common.global_lock) {
 380                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 381                 if (ACPI_FAILURE(status))
 382                         return_VALUE(-ENODEV);
 383         }
 384
 385         spin_lock_irqsave(&ec->polling.lock, flags);
 386
 387         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
 388                                 &ec->common.command_addr);
 389         result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 390         if (result)
 391                 goto end;
 392
 393         acpi_hw_low_level_write(8, address, &ec->common.data_addr);
 394         result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 395         if (result)
 396                 goto end;
 397
 398         acpi_hw_low_level_write(8, data, &ec->common.data_addr);
 399         result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 400         if (result)
 401                 goto end;
 402
 403         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
 404                           data, address));
 405
 406       end:
 407         spin_unlock_irqrestore(&ec->polling.lock, flags);
 408
 409         if (ec->common.global_lock)
 410                 acpi_release_global_lock(glk);
 411
 412         return_VALUE(result);
 413 }
 414
 415 static int acpi_ec_burst_read(union acpi_ec *ec, u8 address, u32 * data)
 416 {
 417         int status = 0;
 418         u32 glk;
 419
 420         ACPI_FUNCTION_TRACE("acpi_ec_read");
 421
 422         if (!ec || !data)
 423                 return_VALUE(-EINVAL);
 424
 425         *data = 0;
 426
 427         if (ec->common.global_lock) {
 428                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 429                 if (ACPI_FAILURE(status))
 430                         return_VALUE(-ENODEV);
 431         }
 432
 433         WARN_ON(in_interrupt());
 434         down(&ec->burst.sem);
 435
 436         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 437         if (status) {
 438                 printk("read EC, IB not empty\n");
 439                 goto end;
 440         }
 441         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
 442                                 &ec->common.command_addr);
 443         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 444         if (status) {
 445                 printk("read EC, IB not empty\n");
 446         }
 447
 448         acpi_hw_low_level_write(8, address, &ec->common.data_addr);
 449         status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
 450         if (status) {
 451                 printk("read EC, OB not full\n");
 452                 goto end;
 453         }
 454         acpi_hw_low_level_read(8, data, &ec->common.data_addr);
 455         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
 456                           *data, address));
 457
 458       end:
 459         up(&ec->burst.sem);
 460
 461         if (ec->common.global_lock)
 462                 acpi_release_global_lock(glk);
 463
 464         return_VALUE(status);
 465 }
 466
 467 static int acpi_ec_burst_write(union acpi_ec *ec, u8 address, u8 data)
 468 {
 469         int status = 0;
 470         u32 glk;
 471
 472         ACPI_FUNCTION_TRACE("acpi_ec_write");
 473
 474         if (!ec)
 475                 return_VALUE(-EINVAL);
 476
 477         if (ec->common.global_lock) {
 478                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 479                 if (ACPI_FAILURE(status))
 480                         return_VALUE(-ENODEV);
 481         }
 482
 483         WARN_ON(in_interrupt());
 484         down(&ec->burst.sem);
 485
 486         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 487         if (status) {
 488                 printk("write EC, IB not empty\n");
 489         }
 490         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
 491                                 &ec->common.command_addr);
 492         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 493         if (status) {
 494                 printk("write EC, IB not empty\n");
 495         }
 496
 497         acpi_hw_low_level_write(8, address, &ec->common.data_addr);
 498         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 499         if (status) {
 500                 printk("write EC, IB not empty\n");
 501         }
 502
 503         acpi_hw_low_level_write(8, data, &ec->common.data_addr);
 504
 505         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
 506                           data, address));
 507
 508         up(&ec->burst.sem);
 509
 510         if (ec->common.global_lock)
 511                 acpi_release_global_lock(glk);
 512
 513         return_VALUE(status);
 514 }
 515
 516 /*
 517  * Externally callable EC access functions. For now, assume 1 EC only
 518  */
 519 int ec_read(u8 addr, u8 * val)
 520 {
 521         union acpi_ec *ec;
 522         int err;
 523         u32 temp_data;
 524
 525         if (!first_ec)
 526                 return -ENODEV;
 527
 528         ec = acpi_driver_data(first_ec);
 529
 530         err = acpi_ec_read(ec, addr, &temp_data);
 531
 532         if (!err) {
 533                 *val = temp_data;
 534                 return 0;
 535         } else
 536                 return err;
 537 }
 538
 539 EXPORT_SYMBOL(ec_read);
 540
 541 int ec_write(u8 addr, u8 val)
 542 {
 543         union acpi_ec *ec;
 544         int err;
 545
 546         if (!first_ec)
 547                 return -ENODEV;
 548
 549         ec = acpi_driver_data(first_ec);
 550
 551         err = acpi_ec_write(ec, addr, val);
 552
 553         return err;
 554 }
 555
 556 EXPORT_SYMBOL(ec_write);
 557
 558 static int acpi_ec_query(union acpi_ec *ec, u32 * data)
 559 {
 560         if (acpi_ec_polling_mode)
 561                 return acpi_ec_polling_query(ec, data);
 562         else
 563                 return acpi_ec_burst_query(ec, data);
 564 }
 565 static int acpi_ec_polling_query(union acpi_ec *ec, u32 * data)
 566 {
 567         int result = 0;
 568         acpi_status status = AE_OK;
 569         unsigned long flags = 0;
 570         u32 glk = 0;
 571
 572         ACPI_FUNCTION_TRACE("acpi_ec_query");
 573
 574         if (!ec || !data)
 575                 return_VALUE(-EINVAL);
 576
 577         *data = 0;
 578
 579         if (ec->common.global_lock) {
 580                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 581                 if (ACPI_FAILURE(status))
 582                         return_VALUE(-ENODEV);
 583         }
 584
 585         /*
 586          * Query the EC to find out which _Qxx method we need to evaluate.
 587          * Note that successful completion of the query causes the ACPI_EC_SCI
 588          * bit to be cleared (and thus clearing the interrupt source).
 589          */
 590         spin_lock_irqsave(&ec->polling.lock, flags);
 591
 592         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
 593                                 &ec->common.command_addr);
 594         result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
 595         if (result)
 596                 goto end;
 597
 598         acpi_hw_low_level_read(8, data, &ec->common.data_addr);
 599         if (!*data)
 600                 result = -ENODATA;
 601
 602       end:
 603         spin_unlock_irqrestore(&ec->polling.lock, flags);
 604
 605         if (ec->common.global_lock)
 606                 acpi_release_global_lock(glk);
 607
 608         return_VALUE(result);
 609 }
 610 static int acpi_ec_burst_query(union acpi_ec *ec, u32 * data)
 611 {
 612         int status = 0;
 613         u32 glk;
 614
 615         ACPI_FUNCTION_TRACE("acpi_ec_query");
 616
 617         if (!ec || !data)
 618                 return_VALUE(-EINVAL);
 619         *data = 0;
 620
 621         if (ec->common.global_lock) {
 622                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 623                 if (ACPI_FAILURE(status))
 624                         return_VALUE(-ENODEV);
 625         }
 626
 627         down(&ec->burst.sem);
 628
 629         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 630         if (status) {
 631                 printk("query EC, IB not empty\n");
 632                 goto end;
 633         }
 634         /*
 635          * Query the EC to find out which _Qxx method we need to evaluate.
 636          * Note that successful completion of the query causes the ACPI_EC_SCI
 637          * bit to be cleared (and thus clearing the interrupt source).
 638          */
 639         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
 640                                 &ec->common.command_addr);
 641         status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
 642         if (status) {
 643                 printk("query EC, OB not full\n");
 644                 goto end;
 645         }
 646
 647         acpi_hw_low_level_read(8, data, &ec->common.data_addr);
 648         if (!*data)
 649                 status = -ENODATA;
 650
 651       end:
 652         up(&ec->burst.sem);
 653
 654         if (ec->common.global_lock)
 655                 acpi_release_global_lock(glk);
 656
 657         return_VALUE(status);
 658 }
 659
 660 /* --------------------------------------------------------------------------
 661                                 Event Management
 662    -------------------------------------------------------------------------- */
 663
 664 union acpi_ec_query_data {
 665         acpi_handle handle;
 666         u8 data;
 667 };
 668
 669 static void acpi_ec_gpe_query(void *ec_cxt)
 670 {
 671         if (acpi_ec_polling_mode)
 672                 acpi_ec_gpe_polling_query(ec_cxt);
 673         else
 674                 acpi_ec_gpe_burst_query(ec_cxt);
 675 }
 676
 677 static void acpi_ec_gpe_polling_query(void *ec_cxt)
 678 {
 679         union acpi_ec *ec = (union acpi_ec *)ec_cxt;
 680         u32 value = 0;
 681         unsigned long flags = 0;
 682         static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
 683         const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
 684                 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
 685         };
 686
 687         ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
 688
 689         if (!ec_cxt)
 690                 goto end;
 691
 692         spin_lock_irqsave(&ec->polling.lock, flags);
 693         acpi_hw_low_level_read(8, &value, &ec->common.command_addr);
 694         spin_unlock_irqrestore(&ec->polling.lock, flags);
 695
 696         /* TBD: Implement asynch events!
 697          * NOTE: All we care about are EC-SCI's.  Other EC events are
 698          * handled via polling (yuck!).  This is because some systems
 699          * treat EC-SCIs as level (versus EDGE!) triggered, preventing
 700          *  a purely interrupt-driven approach (grumble, grumble).
 701          */
 702         if (!(value & ACPI_EC_FLAG_SCI))
 703                 goto end;
 704
 705         if (acpi_ec_query(ec, &value))
 706                 goto end;
 707
 708         object_name[2] = hex[((value >> 4) & 0x0F)];
 709         object_name[3] = hex[(value & 0x0F)];
 710
 711         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
 712
 713         acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
 714
 715       end:
 716         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
 717 }
 718 static void acpi_ec_gpe_burst_query(void *ec_cxt)
 719 {
 720         union acpi_ec *ec = (union acpi_ec *)ec_cxt;
 721         u32 value;
 722         int result = -ENODATA;
 723         static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
 724         const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
 725                 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
 726         };
 727
 728         ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
 729
 730         if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI)
 731                 result = acpi_ec_query(ec, &value);
 732
 733         if (result)
 734                 goto end;
 735
 736         object_name[2] = hex[((value >> 4) & 0x0F)];
 737         object_name[3] = hex[(value & 0x0F)];
 738
 739         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
 740
 741         acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
 742       end:
 743         atomic_dec(&ec->burst.pending_gpe);
 744         return;
 745 }
 746
 747 static u32 acpi_ec_gpe_handler(void *data)
 748 {
 749         if (acpi_ec_polling_mode)
 750                 return acpi_ec_gpe_polling_handler(data);
 751         else
 752                 return acpi_ec_gpe_burst_handler(data);
 753 }
 754 static u32 acpi_ec_gpe_polling_handler(void *data)
 755 {
 756         acpi_status status = AE_OK;
 757         union acpi_ec *ec = (union acpi_ec *)data;
 758
 759         if (!ec)
 760                 return ACPI_INTERRUPT_NOT_HANDLED;
 761
 762         acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
 763
 764         status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
 765                                              acpi_ec_gpe_query, ec);
 766
 767         if (status == AE_OK)
 768                 return ACPI_INTERRUPT_HANDLED;
 769         else
 770                 return ACPI_INTERRUPT_NOT_HANDLED;
 771 }
 772 static u32 acpi_ec_gpe_burst_handler(void *data)
 773 {
 774         acpi_status status = AE_OK;
 775         u32 value;
 776         union acpi_ec *ec = (union acpi_ec *)data;
 777
 778         if (!ec)
 779                 return ACPI_INTERRUPT_NOT_HANDLED;
 780
 781         acpi_clear_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
 782         value = acpi_ec_read_status(ec);
 783
 784         switch (ec->burst.expect_event) {
 785         case ACPI_EC_EVENT_OBF:
 786                 if (!(value & ACPI_EC_FLAG_OBF))
 787                         break;
 788         case ACPI_EC_EVENT_IBE:
 789                 if ((value & ACPI_EC_FLAG_IBF))
 790                         break;
 791                 ec->burst.expect_event = 0;
 792                 wake_up(&ec->burst.wait);
 793                 return ACPI_INTERRUPT_HANDLED;
 794         default:
 795                 break;
 796         }
 797
 798         if (value & ACPI_EC_FLAG_SCI) {
 799                 atomic_add(1, &ec->burst.pending_gpe);
 800                 status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
 801                                                      acpi_ec_gpe_query, ec);
 802                 return status == AE_OK ?
 803                     ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
 804         }
 805         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
 806         return status == AE_OK ?
 807             ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
 808 }
 809
 810 /* --------------------------------------------------------------------------
 811                              Address Space Management
 812    -------------------------------------------------------------------------- */
 813
 814 static acpi_status
 815 acpi_ec_space_setup(acpi_handle region_handle,
 816                     u32 function, void *handler_context, void **return_context)
 817 {
 818         /*
 819          * The EC object is in the handler context and is needed
 820          * when calling the acpi_ec_space_handler.
 821          */
 822         *return_context = (function != ACPI_REGION_DEACTIVATE) ?
 823             handler_context : NULL;
 824
 825         return AE_OK;
 826 }
 827
 828 static acpi_status
 829 acpi_ec_space_handler(u32 function,
 830                       acpi_physical_address address,
 831                       u32 bit_width,
 832                       acpi_integer * value,
 833                       void *handler_context, void *region_context)
 834 {
 835         int result = 0;
 836         union acpi_ec *ec = NULL;
 837         u64 temp = *value;
 838         acpi_integer f_v = 0;
 839         int i = 0;
 840
 841         ACPI_FUNCTION_TRACE("acpi_ec_space_handler");
 842
 843         if ((address > 0xFF) || !value || !handler_context)
 844                 return_VALUE(AE_BAD_PARAMETER);
 845
 846         if (bit_width != 8 && acpi_strict) {
 847                 printk(KERN_WARNING PREFIX
 848                        "acpi_ec_space_handler: bit_width should be 8\n");
 849                 return_VALUE(AE_BAD_PARAMETER);
 850         }
 851
 852         ec = (union acpi_ec *)handler_context;
 853
 854       next_byte:
 855         switch (function) {
 856         case ACPI_READ:
 857                 temp = 0;
 858                 result = acpi_ec_read(ec, (u8) address, (u32 *) & temp);
 859                 break;
 860         case ACPI_WRITE:
 861                 result = acpi_ec_write(ec, (u8) address, (u8) temp);
 862                 break;
 863         default:
 864                 result = -EINVAL;
 865                 goto out;
 866                 break;
 867         }
 868
 869         bit_width -= 8;
 870         if (bit_width) {
 871                 if (function == ACPI_READ)
 872                         f_v |= temp << 8 * i;
 873                 if (function == ACPI_WRITE)
 874                         temp >>= 8;
 875                 i++;
 876                 address++;
 877                 goto next_byte;
 878         }
 879
 880         if (function == ACPI_READ) {
 881                 f_v |= temp << 8 * i;
 882                 *value = f_v;
 883         }
 884
 885       out:
 886         switch (result) {
 887         case -EINVAL:
 888                 return_VALUE(AE_BAD_PARAMETER);
 889                 break;
 890         case -ENODEV:
 891                 return_VALUE(AE_NOT_FOUND);
 892                 break;
 893         case -ETIME:
 894                 return_VALUE(AE_TIME);
 895                 break;
 896         default:
 897                 return_VALUE(AE_OK);
 898         }
 899 }
 900
 901 /* --------------------------------------------------------------------------
 902                               FS Interface (/proc)
 903    -------------------------------------------------------------------------- */
 904
 905 static struct proc_dir_entry *acpi_ec_dir;
 906
 907 static int acpi_ec_read_info(struct seq_file *seq, void *offset)
 908 {
 909         union acpi_ec *ec = (union acpi_ec *)seq->private;
 910
 911         ACPI_FUNCTION_TRACE("acpi_ec_read_info");
 912
 913         if (!ec)
 914                 goto end;
 915
 916         seq_printf(seq, "gpe bit:                 0x%02x\n",
 917                    (u32) ec->common.gpe_bit);
 918         seq_printf(seq, "ports:                   0x%02x, 0x%02x\n",
 919                    (u32) ec->common.status_addr.address,
 920                    (u32) ec->common.data_addr.address);
 921         seq_printf(seq, "use global lock:         %s\n",
 922                    ec->common.global_lock ? "yes" : "no");
 923         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
 924
 925       end:
 926         return_VALUE(0);
 927 }
 928
 929 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
 930 {
 931         return single_open(file, acpi_ec_read_info, PDE(inode)->data);
 932 }
 933
 934 static struct file_operations acpi_ec_info_ops = {
 935         .open = acpi_ec_info_open_fs,
 936         .read = seq_read,
 937         .llseek = seq_lseek,
 938         .release = single_release,
 939         .owner = THIS_MODULE,
 940 };
 941
 942 static int acpi_ec_add_fs(struct acpi_device *device)
 943 {
 944         struct proc_dir_entry *entry = NULL;
 945
 946         ACPI_FUNCTION_TRACE("acpi_ec_add_fs");
 947
 948         if (!acpi_device_dir(device)) {
 949                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 950                                                      acpi_ec_dir);
 951                 if (!acpi_device_dir(device))
 952                         return_VALUE(-ENODEV);
 953         }
 954
 955         entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
 956                                   acpi_device_dir(device));
 957         if (!entry)
 958                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 959                                   "Unable to create '%s' fs entry\n",
 960                                   ACPI_EC_FILE_INFO));
 961         else {
 962                 entry->proc_fops = &acpi_ec_info_ops;
 963                 entry->data = acpi_driver_data(device);
 964                 entry->owner = THIS_MODULE;
 965         }
 966
 967         return_VALUE(0);
 968 }
 969
 970 static int acpi_ec_remove_fs(struct acpi_device *device)
 971 {
 972         ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");
 973
 974         if (acpi_device_dir(device)) {
 975                 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
 976                 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
 977                 acpi_device_dir(device) = NULL;
 978         }
 979
 980         return_VALUE(0);
 981 }
 982
 983 /* --------------------------------------------------------------------------
 984                                Driver Interface
 985    -------------------------------------------------------------------------- */
 986
 987 static int acpi_ec_polling_add(struct acpi_device *device)
 988 {
 989         int result = 0;
 990         acpi_status status = AE_OK;
 991         union acpi_ec *ec = NULL;
 992         unsigned long uid;
 993
 994         ACPI_FUNCTION_TRACE("acpi_ec_add");
 995
 996         if (!device)
 997                 return_VALUE(-EINVAL);
 998
 999         ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1000         if (!ec)
1001                 return_VALUE(-ENOMEM);
1002         memset(ec, 0, sizeof(union acpi_ec));
1003
1004         ec->common.handle = device->handle;
1005         ec->common.uid = -1;
1006         spin_lock_init(&ec->polling.lock);
1007         strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
1008         strcpy(acpi_device_class(device), ACPI_EC_CLASS);
1009         acpi_driver_data(device) = ec;
1010
1011         /* Use the global lock for all EC transactions? */
1012         acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1013                               &ec->common.global_lock);
1014
1015         /* If our UID matches the UID for the ECDT-enumerated EC,
1016            we now have the *real* EC info, so kill the makeshift one. */
1017         acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid);
1018         if (ec_ecdt && ec_ecdt->common.uid == uid) {
1019                 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
1020                                                   ACPI_ADR_SPACE_EC,
1021                                                   &acpi_ec_space_handler);
1022
1023                 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1024                                         &acpi_ec_gpe_handler);
1025
1026                 kfree(ec_ecdt);
1027         }
1028
1029         /* Get GPE bit assignment (EC events). */
1030         /* TODO: Add support for _GPE returning a package */
1031         status =
1032             acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1033                                   &ec->common.gpe_bit);
1034         if (ACPI_FAILURE(status)) {
1035                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1036                                   "Error obtaining GPE bit assignment\n"));
1037                 result = -ENODEV;
1038                 goto end;
1039         }
1040
1041         result = acpi_ec_add_fs(device);
1042         if (result)
1043                 goto end;
1044
1045         printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n",
1046                acpi_device_name(device), acpi_device_bid(device),
1047                (u32) ec->common.gpe_bit);
1048
1049         if (!first_ec)
1050                 first_ec = device;
1051
1052       end:
1053         if (result)
1054                 kfree(ec);
1055
1056         return_VALUE(result);
1057 }
1058 static int acpi_ec_burst_add(struct acpi_device *device)
1059 {
1060         int result = 0;
1061         acpi_status status = AE_OK;
1062         union acpi_ec *ec = NULL;
1063         unsigned long uid;
1064
1065         ACPI_FUNCTION_TRACE("acpi_ec_add");
1066
1067         if (!device)
1068                 return_VALUE(-EINVAL);
1069
1070         ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1071         if (!ec)
1072                 return_VALUE(-ENOMEM);
1073         memset(ec, 0, sizeof(union acpi_ec));
1074
1075         ec->common.handle = device->handle;
1076         ec->common.uid = -1;
1077         atomic_set(&ec->burst.pending_gpe, 0);
1078         atomic_set(&ec->burst.leaving_burst, 1);
1079         init_MUTEX(&ec->burst.sem);
1080         init_waitqueue_head(&ec->burst.wait);
1081         strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
1082         strcpy(acpi_device_class(device), ACPI_EC_CLASS);
1083         acpi_driver_data(device) = ec;
1084
1085         /* Use the global lock for all EC transactions? */
1086         acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1087                               &ec->common.global_lock);
1088
1089         /* If our UID matches the UID for the ECDT-enumerated EC,
1090            we now have the *real* EC info, so kill the makeshift one. */
1091         acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid);
1092         if (ec_ecdt && ec_ecdt->common.uid == uid) {
1093                 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
1094                                                   ACPI_ADR_SPACE_EC,
1095                                                   &acpi_ec_space_handler);
1096
1097                 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1098                                         &acpi_ec_gpe_handler);
1099
1100                 kfree(ec_ecdt);
1101         }
1102
1103         /* Get GPE bit assignment (EC events). */
1104         /* TODO: Add support for _GPE returning a package */
1105         status =
1106             acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1107                                   &ec->common.gpe_bit);
1108         if (ACPI_FAILURE(status)) {
1109                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1110                                   "Error obtaining GPE bit assignment\n"));
1111                 result = -ENODEV;
1112                 goto end;
1113         }
1114
1115         result = acpi_ec_add_fs(device);
1116         if (result)
1117                 goto end;
1118
1119         printk("burst-mode-ec-10-Aug\n");
1120         printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n",
1121                acpi_device_name(device), acpi_device_bid(device),
1122                (u32) ec->common.gpe_bit);
1123
1124         if (!first_ec)
1125                 first_ec = device;
1126
1127       end:
1128         if (result)
1129                 kfree(ec);
1130
1131         return_VALUE(result);
1132 }
1133
1134 static int acpi_ec_remove(struct acpi_device *device, int type)
1135 {
1136         union acpi_ec *ec = NULL;
1137
1138         ACPI_FUNCTION_TRACE("acpi_ec_remove");
1139
1140         if (!device)
1141                 return_VALUE(-EINVAL);
1142
1143         ec = acpi_driver_data(device);
1144
1145         acpi_ec_remove_fs(device);
1146
1147         kfree(ec);
1148
1149         return_VALUE(0);
1150 }
1151
1152 static acpi_status
1153 acpi_ec_io_ports(struct acpi_resource *resource, void *context)
1154 {
1155         union acpi_ec *ec = (union acpi_ec *)context;
1156         struct acpi_generic_address *addr;
1157
1158         if (resource->id != ACPI_RSTYPE_IO) {
1159                 return AE_OK;
1160         }
1161
1162         /*
1163          * The first address region returned is the data port, and
1164          * the second address region returned is the status/command
1165          * port.
1166          */
1167         if (ec->common.data_addr.register_bit_width == 0) {
1168                 addr = &ec->common.data_addr;
1169         } else if (ec->common.command_addr.register_bit_width == 0) {
1170                 addr = &ec->common.command_addr;
1171         } else {
1172                 return AE_CTRL_TERMINATE;
1173         }
1174
1175         addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1176         addr->register_bit_width = 8;
1177         addr->register_bit_offset = 0;
1178         addr->address = resource->data.io.min_base_address;
1179
1180         return AE_OK;
1181 }
1182
1183 static int acpi_ec_start(struct acpi_device *device)
1184 {
1185         acpi_status status = AE_OK;
1186         union acpi_ec *ec = NULL;
1187
1188         ACPI_FUNCTION_TRACE("acpi_ec_start");
1189
1190         if (!device)
1191                 return_VALUE(-EINVAL);
1192
1193         ec = acpi_driver_data(device);
1194
1195         if (!ec)
1196                 return_VALUE(-EINVAL);
1197
1198         /*
1199          * Get I/O port addresses. Convert to GAS format.
1200          */
1201         status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS,
1202                                      acpi_ec_io_ports, ec);
1203         if (ACPI_FAILURE(status)
1204             || ec->common.command_addr.register_bit_width == 0) {
1205                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1206                                   "Error getting I/O port addresses"));
1207                 return_VALUE(-ENODEV);
1208         }
1209
1210         ec->common.status_addr = ec->common.command_addr;
1211
1212         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
1213                           (u32) ec->common.gpe_bit,
1214                           (u32) ec->common.command_addr.address,
1215                           (u32) ec->common.data_addr.address));
1216
1217         /*
1218          * Install GPE handler
1219          */
1220         status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit,
1221                                           ACPI_GPE_EDGE_TRIGGERED,
1222                                           &acpi_ec_gpe_handler, ec);
1223         if (ACPI_FAILURE(status)) {
1224                 return_VALUE(-ENODEV);
1225         }
1226         acpi_set_gpe_type(NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1227         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
1228
1229         status = acpi_install_address_space_handler(ec->common.handle,
1230                                                     ACPI_ADR_SPACE_EC,
1231                                                     &acpi_ec_space_handler,
1232                                                     &acpi_ec_space_setup, ec);
1233         if (ACPI_FAILURE(status)) {
1234                 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1235                                         &acpi_ec_gpe_handler);
1236                 return_VALUE(-ENODEV);
1237         }
1238
1239         return_VALUE(AE_OK);
1240 }
1241
1242 static int acpi_ec_stop(struct acpi_device *device, int type)
1243 {
1244         acpi_status status = AE_OK;
1245         union acpi_ec *ec = NULL;
1246
1247         ACPI_FUNCTION_TRACE("acpi_ec_stop");
1248
1249         if (!device)
1250                 return_VALUE(-EINVAL);
1251
1252         ec = acpi_driver_data(device);
1253
1254         status = acpi_remove_address_space_handler(ec->common.handle,
1255                                                    ACPI_ADR_SPACE_EC,
1256                                                    &acpi_ec_space_handler);
1257         if (ACPI_FAILURE(status))
1258                 return_VALUE(-ENODEV);
1259
1260         status =
1261             acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1262                                     &acpi_ec_gpe_handler);
1263         if (ACPI_FAILURE(status))
1264                 return_VALUE(-ENODEV);
1265
1266         return_VALUE(0);
1267 }
1268
1269 static acpi_status __init
1270 acpi_fake_ecdt_callback(acpi_handle handle,
1271                         u32 Level, void *context, void **retval)
1272 {
1273
1274         if (acpi_ec_polling_mode)
1275                 return acpi_fake_ecdt_polling_callback(handle,
1276                                                        Level, context, retval);
1277         else
1278                 return acpi_fake_ecdt_burst_callback(handle,
1279                                                      Level, context, retval);
1280 }
1281
1282 static acpi_status __init
1283 acpi_fake_ecdt_polling_callback(acpi_handle handle,
1284                                 u32 Level, void *context, void **retval)
1285 {
1286         acpi_status status;
1287
1288         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1289                                      acpi_ec_io_ports, ec_ecdt);
1290         if (ACPI_FAILURE(status))
1291                 return status;
1292         ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1293
1294         ec_ecdt->common.uid = -1;
1295         acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1296
1297         status =
1298             acpi_evaluate_integer(handle, "_GPE", NULL,
1299                                   &ec_ecdt->common.gpe_bit);
1300         if (ACPI_FAILURE(status))
1301                 return status;
1302         spin_lock_init(&ec_ecdt->polling.lock);
1303         ec_ecdt->common.global_lock = TRUE;
1304         ec_ecdt->common.handle = handle;
1305
1306         printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1307                (u32) ec_ecdt->common.gpe_bit,
1308                (u32) ec_ecdt->common.command_addr.address,
1309                (u32) ec_ecdt->common.data_addr.address);
1310
1311         return AE_CTRL_TERMINATE;
1312 }
1313
1314 static acpi_status __init
1315 acpi_fake_ecdt_burst_callback(acpi_handle handle,
1316                               u32 Level, void *context, void **retval)
1317 {
1318         acpi_status status;
1319
1320         init_MUTEX(&ec_ecdt->burst.sem);
1321         init_waitqueue_head(&ec_ecdt->burst.wait);
1322         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1323                                      acpi_ec_io_ports, ec_ecdt);
1324         if (ACPI_FAILURE(status))
1325                 return status;
1326         ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1327
1328         ec_ecdt->common.uid = -1;
1329         acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1330
1331         status =
1332             acpi_evaluate_integer(handle, "_GPE", NULL,
1333                                   &ec_ecdt->common.gpe_bit);
1334         if (ACPI_FAILURE(status))
1335                 return status;
1336         ec_ecdt->common.global_lock = TRUE;
1337         ec_ecdt->common.handle = handle;
1338
1339         printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1340                (u32) ec_ecdt->common.gpe_bit,
1341                (u32) ec_ecdt->common.command_addr.address,
1342                (u32) ec_ecdt->common.data_addr.address);
1343
1344         return AE_CTRL_TERMINATE;
1345 }
1346
1347 /*
1348  * Some BIOS (such as some from Gateway laptops) access EC region very early
1349  * such as in BAT0._INI or EC._INI before an EC device is found and
1350  * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
1351  * required, but if EC regison is accessed early, it is required.
1352  * The routine tries to workaround the BIOS bug by pre-scan EC device
1353  * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
1354  * op region (since _REG isn't invoked yet). The assumption is true for
1355  * all systems found.
1356  */
1357 static int __init acpi_ec_fake_ecdt(void)
1358 {
1359         acpi_status status;
1360         int ret = 0;
1361
1362         printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
1363
1364         ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1365         if (!ec_ecdt) {
1366                 ret = -ENOMEM;
1367                 goto error;
1368         }
1369         memset(ec_ecdt, 0, sizeof(union acpi_ec));
1370
1371         status = acpi_get_devices(ACPI_EC_HID,
1372                                   acpi_fake_ecdt_callback, NULL, NULL);
1373         if (ACPI_FAILURE(status)) {
1374                 kfree(ec_ecdt);
1375                 ec_ecdt = NULL;
1376                 ret = -ENODEV;
1377                 goto error;
1378         }
1379         return 0;
1380       error:
1381         printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
1382         return ret;
1383 }
1384
1385 static int __init acpi_ec_get_real_ecdt(void)
1386 {
1387         if (acpi_ec_polling_mode)
1388                 return acpi_ec_polling_get_real_ecdt();
1389         else
1390                 return acpi_ec_burst_get_real_ecdt();
1391 }
1392
1393 static int __init acpi_ec_polling_get_real_ecdt(void)
1394 {
1395         acpi_status status;
1396         struct acpi_table_ecdt *ecdt_ptr;
1397
1398         status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1399                                          (struct acpi_table_header **)
1400                                          &ecdt_ptr);
1401         if (ACPI_FAILURE(status))
1402                 return -ENODEV;
1403
1404         printk(KERN_INFO PREFIX "Found ECDT\n");
1405
1406         /*
1407          * Generate a temporary ec context to use until the namespace is scanned
1408          */
1409         ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1410         if (!ec_ecdt)
1411                 return -ENOMEM;
1412         memset(ec_ecdt, 0, sizeof(union acpi_ec));
1413
1414         ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1415         ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1416         ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1417         ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1418         spin_lock_init(&ec_ecdt->polling.lock);
1419         /* use the GL just to be safe */
1420         ec_ecdt->common.global_lock = TRUE;
1421         ec_ecdt->common.uid = ecdt_ptr->uid;
1422
1423         status =
1424             acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1425         if (ACPI_FAILURE(status)) {
1426                 goto error;
1427         }
1428
1429         return 0;
1430       error:
1431         printk(KERN_ERR PREFIX "Could not use ECDT\n");
1432         kfree(ec_ecdt);
1433         ec_ecdt = NULL;
1434
1435         return -ENODEV;
1436 }
1437
1438 static int __init acpi_ec_burst_get_real_ecdt(void)
1439 {
1440         acpi_status status;
1441         struct acpi_table_ecdt *ecdt_ptr;
1442
1443         status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1444                                          (struct acpi_table_header **)
1445                                          &ecdt_ptr);
1446         if (ACPI_FAILURE(status))
1447                 return -ENODEV;
1448
1449         printk(KERN_INFO PREFIX "Found ECDT\n");
1450
1451         /*
1452          * Generate a temporary ec context to use until the namespace is scanned
1453          */
1454         ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1455         if (!ec_ecdt)
1456                 return -ENOMEM;
1457         memset(ec_ecdt, 0, sizeof(union acpi_ec));
1458
1459         init_MUTEX(&ec_ecdt->burst.sem);
1460         init_waitqueue_head(&ec_ecdt->burst.wait);
1461         ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1462         ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1463         ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1464         ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1465         /* use the GL just to be safe */
1466         ec_ecdt->common.global_lock = TRUE;
1467         ec_ecdt->common.uid = ecdt_ptr->uid;
1468
1469         status =
1470             acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1471         if (ACPI_FAILURE(status)) {
1472                 goto error;
1473         }
1474
1475         return 0;
1476       error:
1477         printk(KERN_ERR PREFIX "Could not use ECDT\n");
1478         kfree(ec_ecdt);
1479         ec_ecdt = NULL;
1480
1481         return -ENODEV;
1482 }
1483
1484 static int __initdata acpi_fake_ecdt_enabled;
1485 int __init acpi_ec_ecdt_probe(void)
1486 {
1487         acpi_status status;
1488         int ret;
1489
1490         ret = acpi_ec_get_real_ecdt();
1491         /* Try to make a fake ECDT */
1492         if (ret && acpi_fake_ecdt_enabled) {
1493                 ret = acpi_ec_fake_ecdt();
1494         }
1495
1496         if (ret)
1497                 return 0;
1498
1499         /*
1500          * Install GPE handler
1501          */
1502         status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1503                                           ACPI_GPE_EDGE_TRIGGERED,
1504                                           &acpi_ec_gpe_handler, ec_ecdt);
1505         if (ACPI_FAILURE(status)) {
1506                 goto error;
1507         }
1508         acpi_set_gpe_type(NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1509         acpi_enable_gpe(NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR);
1510
1511         status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
1512                                                     ACPI_ADR_SPACE_EC,
1513                                                     &acpi_ec_space_handler,
1514                                                     &acpi_ec_space_setup,
1515                                                     ec_ecdt);
1516         if (ACPI_FAILURE(status)) {
1517                 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1518                                         &acpi_ec_gpe_handler);
1519                 goto error;
1520         }
1521
1522         return 0;
1523
1524       error:
1525         printk(KERN_ERR PREFIX "Could not use ECDT\n");
1526         kfree(ec_ecdt);
1527         ec_ecdt = NULL;
1528
1529         return -ENODEV;
1530 }
1531
1532 static int __init acpi_ec_init(void)
1533 {
1534         int result = 0;
1535
1536         ACPI_FUNCTION_TRACE("acpi_ec_init");
1537
1538         if (acpi_disabled)
1539                 return_VALUE(0);
1540
1541         acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1542         if (!acpi_ec_dir)
1543                 return_VALUE(-ENODEV);
1544
1545         /* Now register the driver for the EC */
1546         result = acpi_bus_register_driver(&acpi_ec_driver);
1547         if (result < 0) {
1548                 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1549                 return_VALUE(-ENODEV);
1550         }
1551
1552         return_VALUE(result);
1553 }
1554
1555 subsys_initcall(acpi_ec_init);
1556
1557 /* EC driver currently not unloadable */
1558 #if 0
1559 static void __exit acpi_ec_exit(void)
1560 {
1561         ACPI_FUNCTION_TRACE("acpi_ec_exit");
1562
1563         acpi_bus_unregister_driver(&acpi_ec_driver);
1564
1565         remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1566
1567         return_VOID;
1568 }
1569 #endif                          /* 0 */
1570
1571 static int __init acpi_fake_ecdt_setup(char *str)
1572 {
1573         acpi_fake_ecdt_enabled = 1;
1574         return 0;
1575 }
1576
1577 __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
1578 static int __init acpi_ec_set_polling_mode(char *str)
1579 {
1580         int burst;
1581
1582         if (!get_option(&str, &burst))
1583                 return 0;
1584
1585         if (burst) {
1586                 acpi_ec_polling_mode = EC_BURST;
1587                 acpi_ec_driver.ops.add = acpi_ec_burst_add;
1588         } else {
1589                 acpi_ec_polling_mode = EC_POLLING;
1590                 acpi_ec_driver.ops.add = acpi_ec_polling_add;
1591         }
1592         printk(KERN_INFO PREFIX "EC %s mode.\n", burst ? "burst" : "polling");
1593         return 0;
1594 }
1595
1596 __setup("ec_burst=", acpi_ec_set_polling_mode);