drivers/acpi/ec.c

   1 /*
   2  *  acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/delay.h>
  32 #include <linux/proc_fs.h>
  33 #include <linux/seq_file.h>
  34 #include <linux/interrupt.h>
  35 #include <asm/io.h>
  36 #include <acpi/acpi_bus.h>
  37 #include <acpi/acpi_drivers.h>
  38 #include <acpi/actypes.h>
  39
  40 #define _COMPONENT              ACPI_EC_COMPONENT
  41 ACPI_MODULE_NAME("acpi_ec")
  42 #define ACPI_EC_COMPONENT               0x00100000
  43 #define ACPI_EC_CLASS                   "embedded_controller"
  44 #define ACPI_EC_HID                     "PNP0C09"
  45 #define ACPI_EC_DRIVER_NAME             "ACPI Embedded Controller Driver"
  46 #define ACPI_EC_DEVICE_NAME             "Embedded Controller"
  47 #define ACPI_EC_FILE_INFO               "info"
  48 #define ACPI_EC_FLAG_OBF        0x01    /* Output buffer full */
  49 #define ACPI_EC_FLAG_IBF        0x02    /* Input buffer full */
  50 #define ACPI_EC_FLAG_BURST      0x10    /* burst mode */
  51 #define ACPI_EC_FLAG_SCI        0x20    /* EC-SCI occurred */
  52 #define ACPI_EC_EVENT_OBF       0x01    /* Output buffer full */
  53 #define ACPI_EC_EVENT_IBE       0x02    /* Input buffer empty */
  54 #define ACPI_EC_DELAY           50      /* Wait 50ms max. during EC ops */
  55 #define ACPI_EC_UDELAY_GLK      1000    /* Wait 1ms max. to get global lock */
  56 #define ACPI_EC_UDELAY         100      /* Poll @ 100us increments */
  57 #define ACPI_EC_UDELAY_COUNT   1000     /* Wait 10ms max. during EC ops */
  58 #define ACPI_EC_COMMAND_READ    0x80
  59 #define ACPI_EC_COMMAND_WRITE   0x81
  60 #define ACPI_EC_BURST_ENABLE    0x82
  61 #define ACPI_EC_BURST_DISABLE   0x83
  62 #define ACPI_EC_COMMAND_QUERY   0x84
  63 #define EC_POLL                 0xFF
  64 #define EC_INTR                 0x00
  65 static int acpi_ec_remove(struct acpi_device *device, int type);
  66 static int acpi_ec_start(struct acpi_device *device);
  67 static int acpi_ec_stop(struct acpi_device *device, int type);
  68 static int acpi_ec_intr_add(struct acpi_device *device);
  69 static int acpi_ec_poll_add(struct acpi_device *device);
  70
  71 static struct acpi_driver acpi_ec_driver = {
  72         .name = ACPI_EC_DRIVER_NAME,
  73         .class = ACPI_EC_CLASS,
  74         .ids = ACPI_EC_HID,
  75         .ops = {
  76                 .add = acpi_ec_intr_add,
  77                 .remove = acpi_ec_remove,
  78                 .start = acpi_ec_start,
  79                 .stop = acpi_ec_stop,
  80                 },
  81 };
  82 union acpi_ec {
  83         struct {
  84                 u32 mode;
  85                 acpi_handle handle;
  86                 unsigned long uid;
  87                 unsigned long gpe_bit;
  88                 struct acpi_generic_address status_addr;
  89                 struct acpi_generic_address command_addr;
  90                 struct acpi_generic_address data_addr;
  91                 unsigned long global_lock;
  92         } common;
  93
  94         struct {
  95                 u32 mode;
  96                 acpi_handle handle;
  97                 unsigned long uid;
  98                 unsigned long gpe_bit;
  99                 struct acpi_generic_address status_addr;
 100                 struct acpi_generic_address command_addr;
 101                 struct acpi_generic_address data_addr;
 102                 unsigned long global_lock;
 103                 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                 struct semaphore sem;
 120         } poll;
 121 };
 122
 123 static int acpi_ec_poll_wait(union acpi_ec *ec, u8 event);
 124 static int acpi_ec_intr_wait(union acpi_ec *ec, unsigned int event);
 125 static int acpi_ec_poll_transaction(union acpi_ec *ec, u8 command,
 126                                     const u8 *wdata, unsigned wdata_len,
 127                                     u8 *rdata, unsigned rdata_len);
 128 static int acpi_ec_intr_transaction(union acpi_ec *ec, u8 command,
 129                                     const u8 *wdata, unsigned wdata_len,
 130                                     u8 *rdata, unsigned rdata_len);
 131 static void acpi_ec_gpe_poll_query(void *ec_cxt);
 132 static void acpi_ec_gpe_intr_query(void *ec_cxt);
 133 static u32 acpi_ec_gpe_poll_handler(void *data);
 134 static u32 acpi_ec_gpe_intr_handler(void *data);
 135 static acpi_status __init
 136 acpi_fake_ecdt_poll_callback(acpi_handle handle,
 137                                 u32 Level, void *context, void **retval);
 138
 139 static acpi_status __init
 140 acpi_fake_ecdt_intr_callback(acpi_handle handle,
 141                               u32 Level, void *context, void **retval);
 142
 143 static int __init acpi_ec_poll_get_real_ecdt(void);
 144 static int __init acpi_ec_intr_get_real_ecdt(void);
 145 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
 146 static union acpi_ec *ec_ecdt;
 147
 148 /* External interfaces use first EC only, so remember */
 149 static struct acpi_device *first_ec;
 150 static int acpi_ec_poll_mode = EC_INTR;
 151
 152 /* --------------------------------------------------------------------------
 153                              Transaction Management
 154    -------------------------------------------------------------------------- */
 155
 156 static u32 acpi_ec_read_status(union acpi_ec *ec)
 157 {
 158         u32 status = 0;
 159
 160         acpi_hw_low_level_read(8, &status, &ec->common.status_addr);
 161         return status;
 162 }
 163
 164 static int acpi_ec_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
 211         ec->intr.expect_event = event;
 212         smp_mb();
 213
 214         switch (event) {
 215         case ACPI_EC_EVENT_IBE:
 216                 if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) {
 217                         ec->intr.expect_event = 0;
 218                         return 0;
 219                 }
 220                 break;
 221         default:
 222                 break;
 223         }
 224
 225         result = wait_event_timeout(ec->intr.wait,
 226                                     !ec->intr.expect_event,
 227                                     msecs_to_jiffies(ACPI_EC_DELAY));
 228
 229         ec->intr.expect_event = 0;
 230         smp_mb();
 231
 232         /*
 233          * Verify that the event in question has actually happened by
 234          * querying EC status. Do the check even if operation timed-out
 235          * to make sure that we did not miss interrupt.
 236          */
 237         switch (event) {
 238         case ACPI_EC_EVENT_OBF:
 239                 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
 240                         return 0;
 241                 break;
 242
 243         case ACPI_EC_EVENT_IBE:
 244                 if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
 245                         return 0;
 246                 break;
 247         }
 248
 249         return -ETIME;
 250 }
 251
 252 #ifdef ACPI_FUTURE_USAGE
 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
 263         status = acpi_ec_read_status(ec);
 264         if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
 265                 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 266                 if (status)
 267                         goto end;
 268                 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE,
 269                                         &ec->common.command_addr);
 270                 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
 271                 acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr);
 272                 if (tmp != 0x90) {      /* Burst ACK byte */
 273                         return -EINVAL;
 274                 }
 275         }
 276
 277         atomic_set(&ec->intr.leaving_burst, 0);
 278         return 0;
 279       end:
 280         ACPI_EXCEPTION ((AE_INFO, status, "EC wait, burst mode");
 281         return -1;
 282 }
 283
 284 int acpi_ec_leave_burst_mode(union acpi_ec *ec)
 285 {
 286         int status = 0;
 287
 288
 289         status = acpi_ec_read_status(ec);
 290         if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){
 291                 status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
 292                 if(status)
 293                         goto end;
 294                 acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->common.command_addr);
 295                 acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
 296         }
 297         atomic_set(&ec->intr.leaving_burst, 1);
 298         return 0;
 299 end:
 300         ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode");
 301         return -1;
 302 }
 303 #endif /* ACPI_FUTURE_USAGE */
 304
 305 static int acpi_ec_transaction(union acpi_ec *ec, u8 command,
 306                                const u8 *wdata, unsigned wdata_len,
 307                                u8 *rdata, unsigned rdata_len)
 308 {
 309         if (acpi_ec_poll_mode)
 310                 return acpi_ec_poll_transaction(ec, command, wdata, wdata_len, rdata, rdata_len);
 311         else
 312                 return acpi_ec_intr_transaction(ec, command, wdata, wdata_len, rdata, rdata_len);
 313 }
 314 static int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data)
 315 {
 316         int result;
 317         u8 d;
 318         result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ, &address, 1, &d, 1);
 319         *data = d;
 320         return result;
 321 }
 322 static int acpi_ec_write(union acpi_ec *ec, u8 address, u8 data)
 323 {
 324         u8 wdata[2] = { address, data };
 325         return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE, wdata, 2, NULL, 0);
 326 }
 327
 328 static int acpi_ec_transaction_unlocked(union acpi_ec *ec, u8 command,
 329                                              const u8 *wdata, unsigned wdata_len,
 330                                              u8 *rdata, unsigned rdata_len)
 331 {
 332         int result;
 333
 334         acpi_hw_low_level_write(8, command, &ec->common.command_addr);
 335
 336         result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 337         if (result)
 338                 return result;
 339
 340         for (; wdata_len > 0; wdata_len --) {
 341
 342                 acpi_hw_low_level_write(8, *(wdata++), &ec->common.data_addr);
 343
 344                 result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 345                 if (result)
 346                         return result;
 347         }
 348
 349
 350         for (; rdata_len > 0; rdata_len --) {
 351                 u32 d;
 352
 353                 result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
 354                 if (result)
 355                         return result;
 356
 357                 acpi_hw_low_level_read(8, &d, &ec->common.data_addr);
 358                 *(rdata++) = (u8) d;
 359         }
 360
 361         return 0;
 362 }
 363
 364 static int acpi_ec_poll_transaction(union acpi_ec *ec, u8 command,
 365                                     const u8 *wdata, unsigned wdata_len,
 366                                     u8 *rdata, unsigned rdata_len)
 367 {
 368         acpi_status status = AE_OK;
 369         int result;
 370         u32 glk = 0;
 371
 372         if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata))
 373                 return -EINVAL;
 374
 375         if (rdata)
 376                 memset(rdata, 0, rdata_len);
 377
 378         if (ec->common.global_lock) {
 379                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 380                 if (ACPI_FAILURE(status))
 381                         return -ENODEV;
 382         }
 383
 384         if (down_interruptible(&ec->poll.sem)) {
 385                 result = -ERESTARTSYS;
 386                 goto end_nosem;
 387         }
 388
 389         result = acpi_ec_transaction_unlocked(ec, command,
 390                                               wdata, wdata_len,
 391                                               rdata, rdata_len);
 392         up(&ec->poll.sem);
 393
 394 end_nosem:
 395         if (ec->common.global_lock)
 396                 acpi_release_global_lock(glk);
 397
 398         return result;
 399 }
 400
 401 static int acpi_ec_intr_transaction(union acpi_ec *ec, u8 command,
 402                                     const u8 *wdata, unsigned wdata_len,
 403                                     u8 *rdata, unsigned rdata_len)
 404 {
 405         int status;
 406         u32 glk;
 407
 408         if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata))
 409                 return -EINVAL;
 410
 411         if (rdata)
 412                 memset(rdata, 0, rdata_len);
 413
 414         if (ec->common.global_lock) {
 415                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 416                 if (ACPI_FAILURE(status))
 417                         return -ENODEV;
 418         }
 419
 420         WARN_ON(in_interrupt());
 421         down(&ec->intr.sem);
 422
 423         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
 424         if (status) {
 425                 printk(KERN_DEBUG PREFIX "read EC, IB not empty\n");
 426                 goto end;
 427         }
 428
 429         status = acpi_ec_transaction_unlocked(ec, command,
 430                                               wdata, wdata_len,
 431                                               rdata, rdata_len);
 432
 433 end:
 434         up(&ec->intr.sem);
 435
 436         if (ec->common.global_lock)
 437                 acpi_release_global_lock(glk);
 438
 439         return status;
 440 }
 441
 442 /*
 443  * Externally callable EC access functions. For now, assume 1 EC only
 444  */
 445 int ec_read(u8 addr, u8 * val)
 446 {
 447         union acpi_ec *ec;
 448         int err;
 449         u32 temp_data;
 450
 451         if (!first_ec)
 452                 return -ENODEV;
 453
 454         ec = acpi_driver_data(first_ec);
 455
 456         err = acpi_ec_read(ec, addr, &temp_data);
 457
 458         if (!err) {
 459                 *val = temp_data;
 460                 return 0;
 461         } else
 462                 return err;
 463 }
 464
 465 EXPORT_SYMBOL(ec_read);
 466
 467 int ec_write(u8 addr, u8 val)
 468 {
 469         union acpi_ec *ec;
 470         int err;
 471
 472         if (!first_ec)
 473                 return -ENODEV;
 474
 475         ec = acpi_driver_data(first_ec);
 476
 477         err = acpi_ec_write(ec, addr, val);
 478
 479         return err;
 480 }
 481
 482 EXPORT_SYMBOL(ec_write);
 483
 484 extern int ec_transaction(u8 command,
 485                           const u8 *wdata, unsigned wdata_len,
 486                           u8 *rdata, unsigned rdata_len)
 487 {
 488         union acpi_ec *ec;
 489
 490         if (!first_ec)
 491                 return -ENODEV;
 492
 493         ec = acpi_driver_data(first_ec);
 494
 495         return acpi_ec_transaction(ec, command, wdata, wdata_len, rdata, rdata_len);
 496 }
 497
 498 EXPORT_SYMBOL(ec_transaction);
 499
 500 static int acpi_ec_query(union acpi_ec *ec, u32 * data) {
 501         int result;
 502         u8 d;
 503
 504         if (!ec || !data)
 505                 return -EINVAL;
 506
 507         /*
 508          * Query the EC to find out which _Qxx method we need to evaluate.
 509          * Note that successful completion of the query causes the ACPI_EC_SCI
 510          * bit to be cleared (and thus clearing the interrupt source).
 511          */
 512
 513         result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1);
 514         if (result)
 515                 return result;
 516
 517         if (!d)
 518                 return -ENODATA;
 519
 520         *data = d;
 521         return 0;
 522 }
 523
 524 /* --------------------------------------------------------------------------
 525                                 Event Management
 526    -------------------------------------------------------------------------- */
 527
 528 union acpi_ec_query_data {
 529         acpi_handle handle;
 530         u8 data;
 531 };
 532
 533 static void acpi_ec_gpe_query(void *ec_cxt)
 534 {
 535         if (acpi_ec_poll_mode)
 536                 acpi_ec_gpe_poll_query(ec_cxt);
 537         else
 538                 acpi_ec_gpe_intr_query(ec_cxt);
 539 }
 540
 541 static void acpi_ec_gpe_poll_query(void *ec_cxt)
 542 {
 543         union acpi_ec *ec = (union acpi_ec *)ec_cxt;
 544         u32 value = 0;
 545         static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
 546         const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
 547                 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
 548         };
 549
 550
 551         if (!ec_cxt)
 552                 goto end;
 553
 554         if (down_interruptible (&ec->poll.sem)) {
 555                 return;
 556         }
 557         acpi_hw_low_level_read(8, &value, &ec->common.command_addr);
 558         up(&ec->poll.sem);
 559
 560         /* TBD: Implement asynch events!
 561          * NOTE: All we care about are EC-SCI's.  Other EC events are
 562          * handled via polling (yuck!).  This is because some systems
 563          * treat EC-SCIs as level (versus EDGE!) triggered, preventing
 564          *  a purely interrupt-driven approach (grumble, grumble).
 565          */
 566         if (!(value & ACPI_EC_FLAG_SCI))
 567                 goto end;
 568
 569         if (acpi_ec_query(ec, &value))
 570                 goto end;
 571
 572         object_name[2] = hex[((value >> 4) & 0x0F)];
 573         object_name[3] = hex[(value & 0x0F)];
 574
 575         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
 576
 577         acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
 578
 579       end:
 580         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
 581 }
 582 static void acpi_ec_gpe_intr_query(void *ec_cxt)
 583 {
 584         union acpi_ec *ec = (union acpi_ec *)ec_cxt;
 585         u32 value;
 586         int result = -ENODATA;
 587         static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
 588         const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
 589                 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
 590         };
 591
 592
 593         if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI)
 594                 result = acpi_ec_query(ec, &value);
 595
 596         if (result)
 597                 goto end;
 598
 599         object_name[2] = hex[((value >> 4) & 0x0F)];
 600         object_name[3] = hex[(value & 0x0F)];
 601
 602         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
 603
 604         acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
 605       end:
 606         atomic_dec(&ec->intr.pending_gpe);
 607         return;
 608 }
 609
 610 static u32 acpi_ec_gpe_handler(void *data)
 611 {
 612         if (acpi_ec_poll_mode)
 613                 return acpi_ec_gpe_poll_handler(data);
 614         else
 615                 return acpi_ec_gpe_intr_handler(data);
 616 }
 617 static u32 acpi_ec_gpe_poll_handler(void *data)
 618 {
 619         acpi_status status = AE_OK;
 620         union acpi_ec *ec = (union acpi_ec *)data;
 621
 622         if (!ec)
 623                 return ACPI_INTERRUPT_NOT_HANDLED;
 624
 625         acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
 626
 627         status = acpi_os_execute(OSL_EC_POLL_HANDLER, acpi_ec_gpe_query, ec);
 628
 629         if (status == AE_OK)
 630                 return ACPI_INTERRUPT_HANDLED;
 631         else
 632                 return ACPI_INTERRUPT_NOT_HANDLED;
 633 }
 634 static u32 acpi_ec_gpe_intr_handler(void *data)
 635 {
 636         acpi_status status = AE_OK;
 637         u32 value;
 638         union acpi_ec *ec = (union acpi_ec *)data;
 639
 640         if (!ec)
 641                 return ACPI_INTERRUPT_NOT_HANDLED;
 642
 643         acpi_clear_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
 644         value = acpi_ec_read_status(ec);
 645
 646         switch (ec->intr.expect_event) {
 647         case ACPI_EC_EVENT_OBF:
 648                 if (!(value & ACPI_EC_FLAG_OBF))
 649                         break;
 650                 ec->intr.expect_event = 0;
 651                 wake_up(&ec->intr.wait);
 652                 break;
 653         case ACPI_EC_EVENT_IBE:
 654                 if ((value & ACPI_EC_FLAG_IBF))
 655                         break;
 656                 ec->intr.expect_event = 0;
 657                 wake_up(&ec->intr.wait);
 658                 break;
 659         default:
 660                 break;
 661         }
 662
 663         if (value & ACPI_EC_FLAG_SCI) {
 664                 atomic_add(1, &ec->intr.pending_gpe);
 665                 status = acpi_os_execute(OSL_EC_BURST_HANDLER,
 666                                                      acpi_ec_gpe_query, ec);
 667                 return status == AE_OK ?
 668                     ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
 669         }
 670         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
 671         return status == AE_OK ?
 672             ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
 673 }
 674
 675 /* --------------------------------------------------------------------------
 676                              Address Space Management
 677    -------------------------------------------------------------------------- */
 678
 679 static acpi_status
 680 acpi_ec_space_setup(acpi_handle region_handle,
 681                     u32 function, void *handler_context, void **return_context)
 682 {
 683         /*
 684          * The EC object is in the handler context and is needed
 685          * when calling the acpi_ec_space_handler.
 686          */
 687         *return_context = (function != ACPI_REGION_DEACTIVATE) ?
 688             handler_context : NULL;
 689
 690         return AE_OK;
 691 }
 692
 693 static acpi_status
 694 acpi_ec_space_handler(u32 function,
 695                       acpi_physical_address address,
 696                       u32 bit_width,
 697                       acpi_integer * value,
 698                       void *handler_context, void *region_context)
 699 {
 700         int result = 0;
 701         union acpi_ec *ec = NULL;
 702         u64 temp = *value;
 703         acpi_integer f_v = 0;
 704         int i = 0;
 705
 706
 707         if ((address > 0xFF) || !value || !handler_context)
 708                 return AE_BAD_PARAMETER;
 709
 710         if (bit_width != 8 && acpi_strict) {
 711                 printk(KERN_WARNING PREFIX
 712                        "acpi_ec_space_handler: bit_width should be 8\n");
 713                 return AE_BAD_PARAMETER;
 714         }
 715
 716         ec = (union acpi_ec *)handler_context;
 717
 718       next_byte:
 719         switch (function) {
 720         case ACPI_READ:
 721                 temp = 0;
 722                 result = acpi_ec_read(ec, (u8) address, (u32 *) & temp);
 723                 break;
 724         case ACPI_WRITE:
 725                 result = acpi_ec_write(ec, (u8) address, (u8) temp);
 726                 break;
 727         default:
 728                 result = -EINVAL;
 729                 goto out;
 730                 break;
 731         }
 732
 733         bit_width -= 8;
 734         if (bit_width) {
 735                 if (function == ACPI_READ)
 736                         f_v |= temp << 8 * i;
 737                 if (function == ACPI_WRITE)
 738                         temp >>= 8;
 739                 i++;
 740                 address++;
 741                 goto next_byte;
 742         }
 743
 744         if (function == ACPI_READ) {
 745                 f_v |= temp << 8 * i;
 746                 *value = f_v;
 747         }
 748
 749       out:
 750         switch (result) {
 751         case -EINVAL:
 752                 return AE_BAD_PARAMETER;
 753                 break;
 754         case -ENODEV:
 755                 return AE_NOT_FOUND;
 756                 break;
 757         case -ETIME:
 758                 return AE_TIME;
 759                 break;
 760         default:
 761                 return AE_OK;
 762         }
 763 }
 764
 765 /* --------------------------------------------------------------------------
 766                               FS Interface (/proc)
 767    -------------------------------------------------------------------------- */
 768
 769 static struct proc_dir_entry *acpi_ec_dir;
 770
 771 static int acpi_ec_read_info(struct seq_file *seq, void *offset)
 772 {
 773         union acpi_ec *ec = (union acpi_ec *)seq->private;
 774
 775
 776         if (!ec)
 777                 goto end;
 778
 779         seq_printf(seq, "gpe bit:                 0x%02x\n",
 780                    (u32) ec->common.gpe_bit);
 781         seq_printf(seq, "ports:                   0x%02x, 0x%02x\n",
 782                    (u32) ec->common.status_addr.address,
 783                    (u32) ec->common.data_addr.address);
 784         seq_printf(seq, "use global lock:         %s\n",
 785                    ec->common.global_lock ? "yes" : "no");
 786         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
 787
 788       end:
 789         return 0;
 790 }
 791
 792 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
 793 {
 794         return single_open(file, acpi_ec_read_info, PDE(inode)->data);
 795 }
 796
 797 static const struct file_operations acpi_ec_info_ops = {
 798         .open = acpi_ec_info_open_fs,
 799         .read = seq_read,
 800         .llseek = seq_lseek,
 801         .release = single_release,
 802         .owner = THIS_MODULE,
 803 };
 804
 805 static int acpi_ec_add_fs(struct acpi_device *device)
 806 {
 807         struct proc_dir_entry *entry = NULL;
 808
 809
 810         if (!acpi_device_dir(device)) {
 811                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 812                                                      acpi_ec_dir);
 813                 if (!acpi_device_dir(device))
 814                         return -ENODEV;
 815         }
 816
 817         entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
 818                                   acpi_device_dir(device));
 819         if (!entry)
 820                 return -ENODEV;
 821         else {
 822                 entry->proc_fops = &acpi_ec_info_ops;
 823                 entry->data = acpi_driver_data(device);
 824                 entry->owner = THIS_MODULE;
 825         }
 826
 827         return 0;
 828 }
 829
 830 static int acpi_ec_remove_fs(struct acpi_device *device)
 831 {
 832
 833         if (acpi_device_dir(device)) {
 834                 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
 835                 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
 836                 acpi_device_dir(device) = NULL;
 837         }
 838
 839         return 0;
 840 }
 841
 842 /* --------------------------------------------------------------------------
 843                                Driver Interface
 844    -------------------------------------------------------------------------- */
 845
 846 static int acpi_ec_poll_add(struct acpi_device *device)
 847 {
 848         int result = 0;
 849         acpi_status status = AE_OK;
 850         union acpi_ec *ec = NULL;
 851
 852
 853         if (!device)
 854                 return -EINVAL;
 855
 856         ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
 857         if (!ec)
 858                 return -ENOMEM;
 859         memset(ec, 0, sizeof(union acpi_ec));
 860
 861         ec->common.handle = device->handle;
 862         ec->common.uid = -1;
 863         init_MUTEX(&ec->poll.sem);
 864         strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
 865         strcpy(acpi_device_class(device), ACPI_EC_CLASS);
 866         acpi_driver_data(device) = ec;
 867
 868         /* Use the global lock for all EC transactions? */
 869         acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
 870                               &ec->common.global_lock);
 871
 872         /* XXX we don't test uids, because on some boxes ecdt uid = 0, see:
 873            http://bugzilla.kernel.org/show_bug.cgi?id=6111 */
 874         if (ec_ecdt) {
 875                 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
 876                                                   ACPI_ADR_SPACE_EC,
 877                                                   &acpi_ec_space_handler);
 878
 879                 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
 880                                         &acpi_ec_gpe_handler);
 881
 882                 kfree(ec_ecdt);
 883         }
 884
 885         /* Get GPE bit assignment (EC events). */
 886         /* TODO: Add support for _GPE returning a package */
 887         status =
 888             acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
 889                                   &ec->common.gpe_bit);
 890         if (ACPI_FAILURE(status)) {
 891                 ACPI_EXCEPTION((AE_INFO, status, "Obtaining GPE bit"));
 892                 result = -ENODEV;
 893                 goto end;
 894         }
 895
 896         result = acpi_ec_add_fs(device);
 897         if (result)
 898                 goto end;
 899
 900         printk(KERN_INFO PREFIX "%s [%s] (gpe %d) polling mode.\n",
 901                acpi_device_name(device), acpi_device_bid(device),
 902                (u32) ec->common.gpe_bit);
 903
 904         if (!first_ec)
 905                 first_ec = device;
 906
 907       end:
 908         if (result)
 909                 kfree(ec);
 910
 911         return result;
 912 }
 913 static int acpi_ec_intr_add(struct acpi_device *device)
 914 {
 915         int result = 0;
 916         acpi_status status = AE_OK;
 917         union acpi_ec *ec = NULL;
 918
 919
 920         if (!device)
 921                 return -EINVAL;
 922
 923         ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
 924         if (!ec)
 925                 return -ENOMEM;
 926         memset(ec, 0, sizeof(union acpi_ec));
 927
 928         ec->common.handle = device->handle;
 929         ec->common.uid = -1;
 930         atomic_set(&ec->intr.pending_gpe, 0);
 931         atomic_set(&ec->intr.leaving_burst, 1);
 932         init_MUTEX(&ec->intr.sem);
 933         init_waitqueue_head(&ec->intr.wait);
 934         strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
 935         strcpy(acpi_device_class(device), ACPI_EC_CLASS);
 936         acpi_driver_data(device) = ec;
 937
 938         /* Use the global lock for all EC transactions? */
 939         acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
 940                               &ec->common.global_lock);
 941
 942         /* XXX we don't test uids, because on some boxes ecdt uid = 0, see:
 943            http://bugzilla.kernel.org/show_bug.cgi?id=6111 */
 944         if (ec_ecdt) {
 945                 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
 946                                                   ACPI_ADR_SPACE_EC,
 947                                                   &acpi_ec_space_handler);
 948
 949                 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
 950                                         &acpi_ec_gpe_handler);
 951
 952                 kfree(ec_ecdt);
 953         }
 954
 955         /* Get GPE bit assignment (EC events). */
 956         /* TODO: Add support for _GPE returning a package */
 957         status =
 958             acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
 959                                   &ec->common.gpe_bit);
 960         if (ACPI_FAILURE(status)) {
 961                 printk(KERN_ERR PREFIX "Obtaining GPE bit assignment\n");
 962                 result = -ENODEV;
 963                 goto end;
 964         }
 965
 966         result = acpi_ec_add_fs(device);
 967         if (result)
 968                 goto end;
 969
 970         printk(KERN_INFO PREFIX "%s [%s] (gpe %d) interrupt mode.\n",
 971                acpi_device_name(device), acpi_device_bid(device),
 972                (u32) ec->common.gpe_bit);
 973
 974         if (!first_ec)
 975                 first_ec = device;
 976
 977       end:
 978         if (result)
 979                 kfree(ec);
 980
 981         return result;
 982 }
 983
 984 static int acpi_ec_remove(struct acpi_device *device, int type)
 985 {
 986         union acpi_ec *ec = NULL;
 987
 988
 989         if (!device)
 990                 return -EINVAL;
 991
 992         ec = acpi_driver_data(device);
 993
 994         acpi_ec_remove_fs(device);
 995
 996         kfree(ec);
 997
 998         return 0;
 999 }
1000
1001 static acpi_status
1002 acpi_ec_io_ports(struct acpi_resource *resource, void *context)
1003 {
1004         union acpi_ec *ec = (union acpi_ec *)context;
1005         struct acpi_generic_address *addr;
1006
1007         if (resource->type != ACPI_RESOURCE_TYPE_IO) {
1008                 return AE_OK;
1009         }
1010
1011         /*
1012          * The first address region returned is the data port, and
1013          * the second address region returned is the status/command
1014          * port.
1015          */
1016         if (ec->common.data_addr.register_bit_width == 0) {
1017                 addr = &ec->common.data_addr;
1018         } else if (ec->common.command_addr.register_bit_width == 0) {
1019                 addr = &ec->common.command_addr;
1020         } else {
1021                 return AE_CTRL_TERMINATE;
1022         }
1023
1024         addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1025         addr->register_bit_width = 8;
1026         addr->register_bit_offset = 0;
1027         addr->address = resource->data.io.minimum;
1028
1029         return AE_OK;
1030 }
1031
1032 static int acpi_ec_start(struct acpi_device *device)
1033 {
1034         acpi_status status = AE_OK;
1035         union acpi_ec *ec = NULL;
1036
1037
1038         if (!device)
1039                 return -EINVAL;
1040
1041         ec = acpi_driver_data(device);
1042
1043         if (!ec)
1044                 return -EINVAL;
1045
1046         /*
1047          * Get I/O port addresses. Convert to GAS format.
1048          */
1049         status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS,
1050                                      acpi_ec_io_ports, ec);
1051         if (ACPI_FAILURE(status)
1052             || ec->common.command_addr.register_bit_width == 0) {
1053                 printk(KERN_ERR PREFIX "Error getting I/O port addresses\n");
1054                 return -ENODEV;
1055         }
1056
1057         ec->common.status_addr = ec->common.command_addr;
1058
1059         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
1060                           (u32) ec->common.gpe_bit,
1061                           (u32) ec->common.command_addr.address,
1062                           (u32) ec->common.data_addr.address));
1063
1064         /*
1065          * Install GPE handler
1066          */
1067         status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit,
1068                                           ACPI_GPE_EDGE_TRIGGERED,
1069                                           &acpi_ec_gpe_handler, ec);
1070         if (ACPI_FAILURE(status)) {
1071                 return -ENODEV;
1072         }
1073         acpi_set_gpe_type(NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1074         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
1075
1076         status = acpi_install_address_space_handler(ec->common.handle,
1077                                                     ACPI_ADR_SPACE_EC,
1078                                                     &acpi_ec_space_handler,
1079                                                     &acpi_ec_space_setup, ec);
1080         if (ACPI_FAILURE(status)) {
1081                 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1082                                         &acpi_ec_gpe_handler);
1083                 return -ENODEV;
1084         }
1085
1086         return AE_OK;
1087 }
1088
1089 static int acpi_ec_stop(struct acpi_device *device, int type)
1090 {
1091         acpi_status status = AE_OK;
1092         union acpi_ec *ec = NULL;
1093
1094
1095         if (!device)
1096                 return -EINVAL;
1097
1098         ec = acpi_driver_data(device);
1099
1100         status = acpi_remove_address_space_handler(ec->common.handle,
1101                                                    ACPI_ADR_SPACE_EC,
1102                                                    &acpi_ec_space_handler);
1103         if (ACPI_FAILURE(status))
1104                 return -ENODEV;
1105
1106         status =
1107             acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1108                                     &acpi_ec_gpe_handler);
1109         if (ACPI_FAILURE(status))
1110                 return -ENODEV;
1111
1112         return 0;
1113 }
1114
1115 static acpi_status __init
1116 acpi_fake_ecdt_callback(acpi_handle handle,
1117                         u32 Level, void *context, void **retval)
1118 {
1119
1120         if (acpi_ec_poll_mode)
1121                 return acpi_fake_ecdt_poll_callback(handle,
1122                                                        Level, context, retval);
1123         else
1124                 return acpi_fake_ecdt_intr_callback(handle,
1125                                                      Level, context, retval);
1126 }
1127
1128 static acpi_status __init
1129 acpi_fake_ecdt_poll_callback(acpi_handle handle,
1130                                 u32 Level, void *context, void **retval)
1131 {
1132         acpi_status status;
1133
1134         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1135                                      acpi_ec_io_ports, ec_ecdt);
1136         if (ACPI_FAILURE(status))
1137                 return status;
1138         ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1139
1140         ec_ecdt->common.uid = -1;
1141         acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1142
1143         status =
1144             acpi_evaluate_integer(handle, "_GPE", NULL,
1145                                   &ec_ecdt->common.gpe_bit);
1146         if (ACPI_FAILURE(status))
1147                 return status;
1148         init_MUTEX(&ec_ecdt->poll.sem);
1149         ec_ecdt->common.global_lock = TRUE;
1150         ec_ecdt->common.handle = handle;
1151
1152         printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1153                (u32) ec_ecdt->common.gpe_bit,
1154                (u32) ec_ecdt->common.command_addr.address,
1155                (u32) ec_ecdt->common.data_addr.address);
1156
1157         return AE_CTRL_TERMINATE;
1158 }
1159
1160 static acpi_status __init
1161 acpi_fake_ecdt_intr_callback(acpi_handle handle,
1162                               u32 Level, void *context, void **retval)
1163 {
1164         acpi_status status;
1165
1166         init_MUTEX(&ec_ecdt->intr.sem);
1167         init_waitqueue_head(&ec_ecdt->intr.wait);
1168         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1169                                      acpi_ec_io_ports, ec_ecdt);
1170         if (ACPI_FAILURE(status))
1171                 return status;
1172         ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1173
1174         ec_ecdt->common.uid = -1;
1175         acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1176
1177         status =
1178             acpi_evaluate_integer(handle, "_GPE", NULL,
1179                                   &ec_ecdt->common.gpe_bit);
1180         if (ACPI_FAILURE(status))
1181                 return status;
1182         ec_ecdt->common.global_lock = TRUE;
1183         ec_ecdt->common.handle = handle;
1184
1185         printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1186                (u32) ec_ecdt->common.gpe_bit,
1187                (u32) ec_ecdt->common.command_addr.address,
1188                (u32) ec_ecdt->common.data_addr.address);
1189
1190         return AE_CTRL_TERMINATE;
1191 }
1192
1193 /*
1194  * Some BIOS (such as some from Gateway laptops) access EC region very early
1195  * such as in BAT0._INI or EC._INI before an EC device is found and
1196  * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
1197  * required, but if EC regison is accessed early, it is required.
1198  * The routine tries to workaround the BIOS bug by pre-scan EC device
1199  * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
1200  * op region (since _REG isn't invoked yet). The assumption is true for
1201  * all systems found.
1202  */
1203 static int __init acpi_ec_fake_ecdt(void)
1204 {
1205         acpi_status status;
1206         int ret = 0;
1207
1208         printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
1209
1210         ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1211         if (!ec_ecdt) {
1212                 ret = -ENOMEM;
1213                 goto error;
1214         }
1215         memset(ec_ecdt, 0, sizeof(union acpi_ec));
1216
1217         status = acpi_get_devices(ACPI_EC_HID,
1218                                   acpi_fake_ecdt_callback, NULL, NULL);
1219         if (ACPI_FAILURE(status)) {
1220                 kfree(ec_ecdt);
1221                 ec_ecdt = NULL;
1222                 ret = -ENODEV;
1223                 goto error;
1224         }
1225         return 0;
1226       error:
1227         printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
1228         return ret;
1229 }
1230
1231 static int __init acpi_ec_get_real_ecdt(void)
1232 {
1233         if (acpi_ec_poll_mode)
1234                 return acpi_ec_poll_get_real_ecdt();
1235         else
1236                 return acpi_ec_intr_get_real_ecdt();
1237 }
1238
1239 static int __init acpi_ec_poll_get_real_ecdt(void)
1240 {
1241         acpi_status status;
1242         struct acpi_table_ecdt *ecdt_ptr;
1243
1244         status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1245                                          (struct acpi_table_header **)
1246                                          &ecdt_ptr);
1247         if (ACPI_FAILURE(status))
1248                 return -ENODEV;
1249
1250         printk(KERN_INFO PREFIX "Found ECDT\n");
1251
1252         /*
1253          * Generate a temporary ec context to use until the namespace is scanned
1254          */
1255         ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1256         if (!ec_ecdt)
1257                 return -ENOMEM;
1258         memset(ec_ecdt, 0, sizeof(union acpi_ec));
1259
1260         ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1261         ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1262         ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1263         ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1264         init_MUTEX(&ec_ecdt->poll.sem);
1265         /* use the GL just to be safe */
1266         ec_ecdt->common.global_lock = TRUE;
1267         ec_ecdt->common.uid = ecdt_ptr->uid;
1268
1269         status =
1270             acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1271         if (ACPI_FAILURE(status)) {
1272                 goto error;
1273         }
1274
1275         return 0;
1276       error:
1277         printk(KERN_ERR PREFIX "Could not use ECDT\n");
1278         kfree(ec_ecdt);
1279         ec_ecdt = NULL;
1280
1281         return -ENODEV;
1282 }
1283
1284 static int __init acpi_ec_intr_get_real_ecdt(void)
1285 {
1286         acpi_status status;
1287         struct acpi_table_ecdt *ecdt_ptr;
1288
1289         status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1290                                          (struct acpi_table_header **)
1291                                          &ecdt_ptr);
1292         if (ACPI_FAILURE(status))
1293                 return -ENODEV;
1294
1295         printk(KERN_INFO PREFIX "Found ECDT\n");
1296
1297         /*
1298          * Generate a temporary ec context to use until the namespace is scanned
1299          */
1300         ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1301         if (!ec_ecdt)
1302                 return -ENOMEM;
1303         memset(ec_ecdt, 0, sizeof(union acpi_ec));
1304
1305         init_MUTEX(&ec_ecdt->intr.sem);
1306         init_waitqueue_head(&ec_ecdt->intr.wait);
1307         ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1308         ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1309         ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1310         ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1311         /* use the GL just to be safe */
1312         ec_ecdt->common.global_lock = TRUE;
1313         ec_ecdt->common.uid = ecdt_ptr->uid;
1314
1315         status =
1316             acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1317         if (ACPI_FAILURE(status)) {
1318                 goto error;
1319         }
1320
1321         return 0;
1322       error:
1323         printk(KERN_ERR PREFIX "Could not use ECDT\n");
1324         kfree(ec_ecdt);
1325         ec_ecdt = NULL;
1326
1327         return -ENODEV;
1328 }
1329
1330 static int __initdata acpi_fake_ecdt_enabled;
1331 int __init acpi_ec_ecdt_probe(void)
1332 {
1333         acpi_status status;
1334         int ret;
1335
1336         ret = acpi_ec_get_real_ecdt();
1337         /* Try to make a fake ECDT */
1338         if (ret && acpi_fake_ecdt_enabled) {
1339                 ret = acpi_ec_fake_ecdt();
1340         }
1341
1342         if (ret)
1343                 return 0;
1344
1345         /*
1346          * Install GPE handler
1347          */
1348         status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1349                                           ACPI_GPE_EDGE_TRIGGERED,
1350                                           &acpi_ec_gpe_handler, ec_ecdt);
1351         if (ACPI_FAILURE(status)) {
1352                 goto error;
1353         }
1354         acpi_set_gpe_type(NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1355         acpi_enable_gpe(NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR);
1356
1357         status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
1358                                                     ACPI_ADR_SPACE_EC,
1359                                                     &acpi_ec_space_handler,
1360                                                     &acpi_ec_space_setup,
1361                                                     ec_ecdt);
1362         if (ACPI_FAILURE(status)) {
1363                 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1364                                         &acpi_ec_gpe_handler);
1365                 goto error;
1366         }
1367
1368         return 0;
1369
1370       error:
1371         printk(KERN_ERR PREFIX "Could not use ECDT\n");
1372         kfree(ec_ecdt);
1373         ec_ecdt = NULL;
1374
1375         return -ENODEV;
1376 }
1377
1378 static int __init acpi_ec_init(void)
1379 {
1380         int result = 0;
1381
1382
1383         if (acpi_disabled)
1384                 return 0;
1385
1386         acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1387         if (!acpi_ec_dir)
1388                 return -ENODEV;
1389
1390         /* Now register the driver for the EC */
1391         result = acpi_bus_register_driver(&acpi_ec_driver);
1392         if (result < 0) {
1393                 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1394                 return -ENODEV;
1395         }
1396
1397         return result;
1398 }
1399
1400 subsys_initcall(acpi_ec_init);
1401
1402 /* EC driver currently not unloadable */
1403 #if 0
1404 static void __exit acpi_ec_exit(void)
1405 {
1406
1407         acpi_bus_unregister_driver(&acpi_ec_driver);
1408
1409         remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1410
1411         return;
1412 }
1413 #endif                          /* 0 */
1414
1415 static int __init acpi_fake_ecdt_setup(char *str)
1416 {
1417         acpi_fake_ecdt_enabled = 1;
1418         return 1;
1419 }
1420
1421 __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
1422 static int __init acpi_ec_set_intr_mode(char *str)
1423 {
1424         int intr;
1425
1426         if (!get_option(&str, &intr))
1427                 return 0;
1428
1429         if (intr) {
1430                 acpi_ec_poll_mode = EC_INTR;
1431                 acpi_ec_driver.ops.add = acpi_ec_intr_add;
1432         } else {
1433                 acpi_ec_poll_mode = EC_POLL;
1434                 acpi_ec_driver.ops.add = acpi_ec_poll_add;
1435         }
1436         printk(KERN_INFO PREFIX "EC %s mode.\n", intr ? "interrupt" : "polling");
1437         return 1;
1438 }
1439
1440 __setup("ec_intr=", acpi_ec_set_intr_mode);