drivers/platform/x86/toshiba_acpi.c

   1 /*
   2  *  toshiba_acpi.c - Toshiba Laptop ACPI Extras
   3  *
   4  *
   5  *  Copyright (C) 2002-2004 John Belmonte
   6  *  Copyright (C) 2008 Philip Langdale
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  *
  23  *  The devolpment page for this driver is located at
  24  *  http://memebeam.org/toys/ToshibaAcpiDriver.
  25  *
  26  *  Credits:
  27  *      Jonathan A. Buzzard - Toshiba HCI info, and critical tips on reverse
  28  *              engineering the Windows drivers
  29  *      Yasushi Nagato - changes for linux kernel 2.4 -> 2.5
  30  *      Rob Miller - TV out and hotkeys help
  31  *
  32  *
  33  *  TODO
  34  *
  35  */
  36
  37 #define TOSHIBA_ACPI_VERSION    "0.19"
  38 #define PROC_INTERFACE_VERSION  1
  39
  40 #include <linux/kernel.h>
  41 #include <linux/module.h>
  42 #include <linux/init.h>
  43 #include <linux/types.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/backlight.h>
  46 #include <linux/platform_device.h>
  47 #include <linux/rfkill.h>
  48
  49 #include <asm/uaccess.h>
  50
  51 #include <acpi/acpi_drivers.h>
  52
  53 MODULE_AUTHOR("John Belmonte");
  54 MODULE_DESCRIPTION("Toshiba Laptop ACPI Extras Driver");
  55 MODULE_LICENSE("GPL");
  56
  57 #define MY_LOGPREFIX "toshiba_acpi: "
  58 #define MY_ERR KERN_ERR MY_LOGPREFIX
  59 #define MY_NOTICE KERN_NOTICE MY_LOGPREFIX
  60 #define MY_INFO KERN_INFO MY_LOGPREFIX
  61
  62 /* Toshiba ACPI method paths */
  63 #define METHOD_LCD_BRIGHTNESS   "\\_SB_.PCI0.VGA_.LCD_._BCM"
  64 #define METHOD_HCI_1            "\\_SB_.VALD.GHCI"
  65 #define METHOD_HCI_2            "\\_SB_.VALZ.GHCI"
  66 #define METHOD_VIDEO_OUT        "\\_SB_.VALX.DSSX"
  67
  68 /* Toshiba HCI interface definitions
  69  *
  70  * HCI is Toshiba's "Hardware Control Interface" which is supposed to
  71  * be uniform across all their models.  Ideally we would just call
  72  * dedicated ACPI methods instead of using this primitive interface.
  73  * However the ACPI methods seem to be incomplete in some areas (for
  74  * example they allow setting, but not reading, the LCD brightness value),
  75  * so this is still useful.
  76  */
  77
  78 #define HCI_WORDS                       6
  79
  80 /* operations */
  81 #define HCI_SET                         0xff00
  82 #define HCI_GET                         0xfe00
  83
  84 /* return codes */
  85 #define HCI_SUCCESS                     0x0000
  86 #define HCI_FAILURE                     0x1000
  87 #define HCI_NOT_SUPPORTED               0x8000
  88 #define HCI_EMPTY                       0x8c00
  89
  90 /* registers */
  91 #define HCI_FAN                         0x0004
  92 #define HCI_SYSTEM_EVENT                0x0016
  93 #define HCI_VIDEO_OUT                   0x001c
  94 #define HCI_HOTKEY_EVENT                0x001e
  95 #define HCI_LCD_BRIGHTNESS              0x002a
  96 #define HCI_WIRELESS                    0x0056
  97
  98 /* field definitions */
  99 #define HCI_LCD_BRIGHTNESS_BITS         3
 100 #define HCI_LCD_BRIGHTNESS_SHIFT        (16-HCI_LCD_BRIGHTNESS_BITS)
 101 #define HCI_LCD_BRIGHTNESS_LEVELS       (1 << HCI_LCD_BRIGHTNESS_BITS)
 102 #define HCI_VIDEO_OUT_LCD               0x1
 103 #define HCI_VIDEO_OUT_CRT               0x2
 104 #define HCI_VIDEO_OUT_TV                0x4
 105 #define HCI_WIRELESS_KILL_SWITCH        0x01
 106 #define HCI_WIRELESS_BT_PRESENT         0x0f
 107 #define HCI_WIRELESS_BT_ATTACH          0x40
 108 #define HCI_WIRELESS_BT_POWER           0x80
 109
 110 static const struct acpi_device_id toshiba_device_ids[] = {
 111         {"TOS6200", 0},
 112         {"TOS6208", 0},
 113         {"TOS1900", 0},
 114         {"", 0},
 115 };
 116 MODULE_DEVICE_TABLE(acpi, toshiba_device_ids);
 117
 118 /* utility
 119  */
 120
 121 static __inline__ void _set_bit(u32 * word, u32 mask, int value)
 122 {
 123         *word = (*word & ~mask) | (mask * value);
 124 }
 125
 126 /* acpi interface wrappers
 127  */
 128
 129 static int is_valid_acpi_path(const char *methodName)
 130 {
 131         acpi_handle handle;
 132         acpi_status status;
 133
 134         status = acpi_get_handle(NULL, (char *)methodName, &handle);
 135         return !ACPI_FAILURE(status);
 136 }
 137
 138 static int write_acpi_int(const char *methodName, int val)
 139 {
 140         struct acpi_object_list params;
 141         union acpi_object in_objs[1];
 142         acpi_status status;
 143
 144         params.count = ARRAY_SIZE(in_objs);
 145         params.pointer = in_objs;
 146         in_objs[0].type = ACPI_TYPE_INTEGER;
 147         in_objs[0].integer.value = val;
 148
 149         status = acpi_evaluate_object(NULL, (char *)methodName, &params, NULL);
 150         return (status == AE_OK);
 151 }
 152
 153 #if 0
 154 static int read_acpi_int(const char *methodName, int *pVal)
 155 {
 156         struct acpi_buffer results;
 157         union acpi_object out_objs[1];
 158         acpi_status status;
 159
 160         results.length = sizeof(out_objs);
 161         results.pointer = out_objs;
 162
 163         status = acpi_evaluate_object(0, (char *)methodName, 0, &results);
 164         *pVal = out_objs[0].integer.value;
 165
 166         return (status == AE_OK) && (out_objs[0].type == ACPI_TYPE_INTEGER);
 167 }
 168 #endif
 169
 170 static const char *method_hci /*= 0*/ ;
 171
 172 /* Perform a raw HCI call.  Here we don't care about input or output buffer
 173  * format.
 174  */
 175 static acpi_status hci_raw(const u32 in[HCI_WORDS], u32 out[HCI_WORDS])
 176 {
 177         struct acpi_object_list params;
 178         union acpi_object in_objs[HCI_WORDS];
 179         struct acpi_buffer results;
 180         union acpi_object out_objs[HCI_WORDS + 1];
 181         acpi_status status;
 182         int i;
 183
 184         params.count = HCI_WORDS;
 185         params.pointer = in_objs;
 186         for (i = 0; i < HCI_WORDS; ++i) {
 187                 in_objs[i].type = ACPI_TYPE_INTEGER;
 188                 in_objs[i].integer.value = in[i];
 189         }
 190
 191         results.length = sizeof(out_objs);
 192         results.pointer = out_objs;
 193
 194         status = acpi_evaluate_object(NULL, (char *)method_hci, &params,
 195                                       &results);
 196         if ((status == AE_OK) && (out_objs->package.count <= HCI_WORDS)) {
 197                 for (i = 0; i < out_objs->package.count; ++i) {
 198                         out[i] = out_objs->package.elements[i].integer.value;
 199                 }
 200         }
 201
 202         return status;
 203 }
 204
 205 /* common hci tasks (get or set one or two value)
 206  *
 207  * In addition to the ACPI status, the HCI system returns a result which
 208  * may be useful (such as "not supported").
 209  */
 210
 211 static acpi_status hci_write1(u32 reg, u32 in1, u32 * result)
 212 {
 213         u32 in[HCI_WORDS] = { HCI_SET, reg, in1, 0, 0, 0 };
 214         u32 out[HCI_WORDS];
 215         acpi_status status = hci_raw(in, out);
 216         *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
 217         return status;
 218 }
 219
 220 static acpi_status hci_read1(u32 reg, u32 * out1, u32 * result)
 221 {
 222         u32 in[HCI_WORDS] = { HCI_GET, reg, 0, 0, 0, 0 };
 223         u32 out[HCI_WORDS];
 224         acpi_status status = hci_raw(in, out);
 225         *out1 = out[2];
 226         *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
 227         return status;
 228 }
 229
 230 static acpi_status hci_write2(u32 reg, u32 in1, u32 in2, u32 *result)
 231 {
 232         u32 in[HCI_WORDS] = { HCI_SET, reg, in1, in2, 0, 0 };
 233         u32 out[HCI_WORDS];
 234         acpi_status status = hci_raw(in, out);
 235         *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
 236         return status;
 237 }
 238
 239 static acpi_status hci_read2(u32 reg, u32 *out1, u32 *out2, u32 *result)
 240 {
 241         u32 in[HCI_WORDS] = { HCI_GET, reg, *out1, *out2, 0, 0 };
 242         u32 out[HCI_WORDS];
 243         acpi_status status = hci_raw(in, out);
 244         *out1 = out[2];
 245         *out2 = out[3];
 246         *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
 247         return status;
 248 }
 249
 250 struct toshiba_acpi_dev {
 251         struct platform_device *p_dev;
 252         struct rfkill *bt_rfk;
 253
 254         const char *bt_name;
 255
 256         struct mutex mutex;
 257 };
 258
 259 static struct toshiba_acpi_dev toshiba_acpi = {
 260         .bt_name = "Toshiba Bluetooth",
 261 };
 262
 263 /* Bluetooth rfkill handlers */
 264
 265 static u32 hci_get_bt_present(bool *present)
 266 {
 267         u32 hci_result;
 268         u32 value, value2;
 269
 270         value = 0;
 271         value2 = 0;
 272         hci_read2(HCI_WIRELESS, &value, &value2, &hci_result);
 273         if (hci_result == HCI_SUCCESS)
 274                 *present = (value & HCI_WIRELESS_BT_PRESENT) ? true : false;
 275
 276         return hci_result;
 277 }
 278
 279 static u32 hci_get_radio_state(bool *radio_state)
 280 {
 281         u32 hci_result;
 282         u32 value, value2;
 283
 284         value = 0;
 285         value2 = 0x0001;
 286         hci_read2(HCI_WIRELESS, &value, &value2, &hci_result);
 287
 288         *radio_state = value & HCI_WIRELESS_KILL_SWITCH;
 289         return hci_result;
 290 }
 291
 292 static int bt_rfkill_set_block(void *data, bool blocked)
 293 {
 294         struct toshiba_acpi_dev *dev = data;
 295         u32 result1, result2;
 296         u32 value;
 297         int err;
 298         bool radio_state;
 299
 300         value = (blocked == false);
 301
 302         mutex_lock(&dev->mutex);
 303         if (hci_get_radio_state(&radio_state) != HCI_SUCCESS) {
 304                 err = -EBUSY;
 305                 goto out;
 306         }
 307
 308         if (!radio_state) {
 309                 err = 0;
 310                 goto out;
 311         }
 312
 313         hci_write2(HCI_WIRELESS, value, HCI_WIRELESS_BT_POWER, &result1);
 314         hci_write2(HCI_WIRELESS, value, HCI_WIRELESS_BT_ATTACH, &result2);
 315
 316         if (result1 != HCI_SUCCESS || result2 != HCI_SUCCESS)
 317                 err = -EBUSY;
 318         else
 319                 err = 0;
 320  out:
 321         mutex_unlock(&dev->mutex);
 322         return err;
 323 }
 324
 325 static void bt_rfkill_poll(struct rfkill *rfkill, void *data)
 326 {
 327         bool new_rfk_state;
 328         bool value;
 329         u32 hci_result;
 330         struct toshiba_acpi_dev *dev = data;
 331
 332         mutex_lock(&dev->mutex);
 333
 334         hci_result = hci_get_radio_state(&value);
 335         if (hci_result != HCI_SUCCESS) {
 336                 /* Can't do anything useful */
 337                 mutex_unlock(&dev->mutex);
 338                 return;
 339         }
 340
 341         new_rfk_state = value;
 342
 343         mutex_unlock(&dev->mutex);
 344
 345         if (rfkill_set_hw_state(rfkill, !new_rfk_state))
 346                 bt_rfkill_set_block(data, true);
 347 }
 348
 349 static const struct rfkill_ops toshiba_rfk_ops = {
 350         .set_block = bt_rfkill_set_block,
 351         .poll = bt_rfkill_poll,
 352 };
 353
 354 static struct proc_dir_entry *toshiba_proc_dir /*= 0*/ ;
 355 static struct backlight_device *toshiba_backlight_device;
 356 static int force_fan;
 357 static int last_key_event;
 358 static int key_event_valid;
 359
 360 typedef struct _ProcItem {
 361         const char *name;
 362         char *(*read_func) (char *);
 363         unsigned long (*write_func) (const char *, unsigned long);
 364 } ProcItem;
 365
 366 /* proc file handlers
 367  */
 368
 369 static int
 370 dispatch_read(char *page, char **start, off_t off, int count, int *eof,
 371               ProcItem * item)
 372 {
 373         char *p = page;
 374         int len;
 375
 376         if (off == 0)
 377                 p = item->read_func(p);
 378
 379         /* ISSUE: I don't understand this code */
 380         len = (p - page);
 381         if (len <= off + count)
 382                 *eof = 1;
 383         *start = page + off;
 384         len -= off;
 385         if (len > count)
 386                 len = count;
 387         if (len < 0)
 388                 len = 0;
 389         return len;
 390 }
 391
 392 static int
 393 dispatch_write(struct file *file, const char __user * buffer,
 394                unsigned long count, ProcItem * item)
 395 {
 396         int result;
 397         char *tmp_buffer;
 398
 399         /* Arg buffer points to userspace memory, which can't be accessed
 400          * directly.  Since we're making a copy, zero-terminate the
 401          * destination so that sscanf can be used on it safely.
 402          */
 403         tmp_buffer = kmalloc(count + 1, GFP_KERNEL);
 404         if (!tmp_buffer)
 405                 return -ENOMEM;
 406
 407         if (copy_from_user(tmp_buffer, buffer, count)) {
 408                 result = -EFAULT;
 409         } else {
 410                 tmp_buffer[count] = 0;
 411                 result = item->write_func(tmp_buffer, count);
 412         }
 413         kfree(tmp_buffer);
 414         return result;
 415 }
 416
 417 static int get_lcd(struct backlight_device *bd)
 418 {
 419         u32 hci_result;
 420         u32 value;
 421
 422         hci_read1(HCI_LCD_BRIGHTNESS, &value, &hci_result);
 423         if (hci_result == HCI_SUCCESS) {
 424                 return (value >> HCI_LCD_BRIGHTNESS_SHIFT);
 425         } else
 426                 return -EFAULT;
 427 }
 428
 429 static char *read_lcd(char *p)
 430 {
 431         int value = get_lcd(NULL);
 432
 433         if (value >= 0) {
 434                 p += sprintf(p, "brightness:              %d\n", value);
 435                 p += sprintf(p, "brightness_levels:       %d\n",
 436                              HCI_LCD_BRIGHTNESS_LEVELS);
 437         } else {
 438                 printk(MY_ERR "Error reading LCD brightness\n");
 439         }
 440
 441         return p;
 442 }
 443
 444 static int set_lcd(int value)
 445 {
 446         u32 hci_result;
 447
 448         value = value << HCI_LCD_BRIGHTNESS_SHIFT;
 449         hci_write1(HCI_LCD_BRIGHTNESS, value, &hci_result);
 450         if (hci_result != HCI_SUCCESS)
 451                 return -EFAULT;
 452
 453         return 0;
 454 }
 455
 456 static int set_lcd_status(struct backlight_device *bd)
 457 {
 458         return set_lcd(bd->props.brightness);
 459 }
 460
 461 static unsigned long write_lcd(const char *buffer, unsigned long count)
 462 {
 463         int value;
 464         int ret;
 465
 466         if (sscanf(buffer, " brightness : %i", &value) == 1 &&
 467             value >= 0 && value < HCI_LCD_BRIGHTNESS_LEVELS) {
 468                 ret = set_lcd(value);
 469                 if (ret == 0)
 470                         ret = count;
 471         } else {
 472                 ret = -EINVAL;
 473         }
 474         return ret;
 475 }
 476
 477 static char *read_video(char *p)
 478 {
 479         u32 hci_result;
 480         u32 value;
 481
 482         hci_read1(HCI_VIDEO_OUT, &value, &hci_result);
 483         if (hci_result == HCI_SUCCESS) {
 484                 int is_lcd = (value & HCI_VIDEO_OUT_LCD) ? 1 : 0;
 485                 int is_crt = (value & HCI_VIDEO_OUT_CRT) ? 1 : 0;
 486                 int is_tv = (value & HCI_VIDEO_OUT_TV) ? 1 : 0;
 487                 p += sprintf(p, "lcd_out:                 %d\n", is_lcd);
 488                 p += sprintf(p, "crt_out:                 %d\n", is_crt);
 489                 p += sprintf(p, "tv_out:                  %d\n", is_tv);
 490         } else {
 491                 printk(MY_ERR "Error reading video out status\n");
 492         }
 493
 494         return p;
 495 }
 496
 497 static unsigned long write_video(const char *buffer, unsigned long count)
 498 {
 499         int value;
 500         int remain = count;
 501         int lcd_out = -1;
 502         int crt_out = -1;
 503         int tv_out = -1;
 504         u32 hci_result;
 505         u32 video_out;
 506
 507         /* scan expression.  Multiple expressions may be delimited with ;
 508          *
 509          *  NOTE: to keep scanning simple, invalid fields are ignored
 510          */
 511         while (remain) {
 512                 if (sscanf(buffer, " lcd_out : %i", &value) == 1)
 513                         lcd_out = value & 1;
 514                 else if (sscanf(buffer, " crt_out : %i", &value) == 1)
 515                         crt_out = value & 1;
 516                 else if (sscanf(buffer, " tv_out : %i", &value) == 1)
 517                         tv_out = value & 1;
 518                 /* advance to one character past the next ; */
 519                 do {
 520                         ++buffer;
 521                         --remain;
 522                 }
 523                 while (remain && *(buffer - 1) != ';');
 524         }
 525
 526         hci_read1(HCI_VIDEO_OUT, &video_out, &hci_result);
 527         if (hci_result == HCI_SUCCESS) {
 528                 unsigned int new_video_out = video_out;
 529                 if (lcd_out != -1)
 530                         _set_bit(&new_video_out, HCI_VIDEO_OUT_LCD, lcd_out);
 531                 if (crt_out != -1)
 532                         _set_bit(&new_video_out, HCI_VIDEO_OUT_CRT, crt_out);
 533                 if (tv_out != -1)
 534                         _set_bit(&new_video_out, HCI_VIDEO_OUT_TV, tv_out);
 535                 /* To avoid unnecessary video disruption, only write the new
 536                  * video setting if something changed. */
 537                 if (new_video_out != video_out)
 538                         write_acpi_int(METHOD_VIDEO_OUT, new_video_out);
 539         } else {
 540                 return -EFAULT;
 541         }
 542
 543         return count;
 544 }
 545
 546 static char *read_fan(char *p)
 547 {
 548         u32 hci_result;
 549         u32 value;
 550
 551         hci_read1(HCI_FAN, &value, &hci_result);
 552         if (hci_result == HCI_SUCCESS) {
 553                 p += sprintf(p, "running:                 %d\n", (value > 0));
 554                 p += sprintf(p, "force_on:                %d\n", force_fan);
 555         } else {
 556                 printk(MY_ERR "Error reading fan status\n");
 557         }
 558
 559         return p;
 560 }
 561
 562 static unsigned long write_fan(const char *buffer, unsigned long count)
 563 {
 564         int value;
 565         u32 hci_result;
 566
 567         if (sscanf(buffer, " force_on : %i", &value) == 1 &&
 568             value >= 0 && value <= 1) {
 569                 hci_write1(HCI_FAN, value, &hci_result);
 570                 if (hci_result != HCI_SUCCESS)
 571                         return -EFAULT;
 572                 else
 573                         force_fan = value;
 574         } else {
 575                 return -EINVAL;
 576         }
 577
 578         return count;
 579 }
 580
 581 static char *read_keys(char *p)
 582 {
 583         u32 hci_result;
 584         u32 value;
 585
 586         if (!key_event_valid) {
 587                 hci_read1(HCI_SYSTEM_EVENT, &value, &hci_result);
 588                 if (hci_result == HCI_SUCCESS) {
 589                         key_event_valid = 1;
 590                         last_key_event = value;
 591                 } else if (hci_result == HCI_EMPTY) {
 592                         /* better luck next time */
 593                 } else if (hci_result == HCI_NOT_SUPPORTED) {
 594                         /* This is a workaround for an unresolved issue on
 595                          * some machines where system events sporadically
 596                          * become disabled. */
 597                         hci_write1(HCI_SYSTEM_EVENT, 1, &hci_result);
 598                         printk(MY_NOTICE "Re-enabled hotkeys\n");
 599                 } else {
 600                         printk(MY_ERR "Error reading hotkey status\n");
 601                         goto end;
 602                 }
 603         }
 604
 605         p += sprintf(p, "hotkey_ready:            %d\n", key_event_valid);
 606         p += sprintf(p, "hotkey:                  0x%04x\n", last_key_event);
 607
 608       end:
 609         return p;
 610 }
 611
 612 static unsigned long write_keys(const char *buffer, unsigned long count)
 613 {
 614         int value;
 615
 616         if (sscanf(buffer, " hotkey_ready : %i", &value) == 1 && value == 0) {
 617                 key_event_valid = 0;
 618         } else {
 619                 return -EINVAL;
 620         }
 621
 622         return count;
 623 }
 624
 625 static char *read_version(char *p)
 626 {
 627         p += sprintf(p, "driver:                  %s\n", TOSHIBA_ACPI_VERSION);
 628         p += sprintf(p, "proc_interface:          %d\n",
 629                      PROC_INTERFACE_VERSION);
 630         return p;
 631 }
 632
 633 /* proc and module init
 634  */
 635
 636 #define PROC_TOSHIBA            "toshiba"
 637
 638 static ProcItem proc_items[] = {
 639         {"lcd", read_lcd, write_lcd},
 640         {"video", read_video, write_video},
 641         {"fan", read_fan, write_fan},
 642         {"keys", read_keys, write_keys},
 643         {"version", read_version, NULL},
 644         {NULL}
 645 };
 646
 647 static acpi_status __init add_device(void)
 648 {
 649         struct proc_dir_entry *proc;
 650         ProcItem *item;
 651
 652         for (item = proc_items; item->name; ++item) {
 653                 proc = create_proc_read_entry(item->name,
 654                                               S_IFREG | S_IRUGO | S_IWUSR,
 655                                               toshiba_proc_dir,
 656                                               (read_proc_t *) dispatch_read,
 657                                               item);
 658                 if (proc && item->write_func)
 659                         proc->write_proc = (write_proc_t *) dispatch_write;
 660         }
 661
 662         return AE_OK;
 663 }
 664
 665 static acpi_status remove_device(void)
 666 {
 667         ProcItem *item;
 668
 669         for (item = proc_items; item->name; ++item)
 670                 remove_proc_entry(item->name, toshiba_proc_dir);
 671         return AE_OK;
 672 }
 673
 674 static struct backlight_ops toshiba_backlight_data = {
 675         .get_brightness = get_lcd,
 676         .update_status  = set_lcd_status,
 677 };
 678
 679 static void toshiba_acpi_exit(void)
 680 {
 681         if (toshiba_acpi.bt_rfk) {
 682                 rfkill_unregister(toshiba_acpi.bt_rfk);
 683                 rfkill_destroy(toshiba_acpi.bt_rfk);
 684         }
 685
 686         if (toshiba_backlight_device)
 687                 backlight_device_unregister(toshiba_backlight_device);
 688
 689         remove_device();
 690
 691         if (toshiba_proc_dir)
 692                 remove_proc_entry(PROC_TOSHIBA, acpi_root_dir);
 693
 694         platform_device_unregister(toshiba_acpi.p_dev);
 695
 696         return;
 697 }
 698
 699 static int __init toshiba_acpi_init(void)
 700 {
 701         acpi_status status = AE_OK;
 702         u32 hci_result;
 703         bool bt_present;
 704         int ret = 0;
 705
 706         if (acpi_disabled)
 707                 return -ENODEV;
 708
 709         /* simple device detection: look for HCI method */
 710         if (is_valid_acpi_path(METHOD_HCI_1))
 711                 method_hci = METHOD_HCI_1;
 712         else if (is_valid_acpi_path(METHOD_HCI_2))
 713                 method_hci = METHOD_HCI_2;
 714         else
 715                 return -ENODEV;
 716
 717         printk(MY_INFO "Toshiba Laptop ACPI Extras version %s\n",
 718                TOSHIBA_ACPI_VERSION);
 719         printk(MY_INFO "    HCI method: %s\n", method_hci);
 720
 721         mutex_init(&toshiba_acpi.mutex);
 722
 723         toshiba_acpi.p_dev = platform_device_register_simple("toshiba_acpi",
 724                                                               -1, NULL, 0);
 725         if (IS_ERR(toshiba_acpi.p_dev)) {
 726                 ret = PTR_ERR(toshiba_acpi.p_dev);
 727                 printk(MY_ERR "unable to register platform device\n");
 728                 toshiba_acpi.p_dev = NULL;
 729                 toshiba_acpi_exit();
 730                 return ret;
 731         }
 732
 733         force_fan = 0;
 734         key_event_valid = 0;
 735
 736         /* enable event fifo */
 737         hci_write1(HCI_SYSTEM_EVENT, 1, &hci_result);
 738
 739         toshiba_proc_dir = proc_mkdir(PROC_TOSHIBA, acpi_root_dir);
 740         if (!toshiba_proc_dir) {
 741                 toshiba_acpi_exit();
 742                 return -ENODEV;
 743         } else {
 744                 status = add_device();
 745                 if (ACPI_FAILURE(status)) {
 746                         toshiba_acpi_exit();
 747                         return -ENODEV;
 748                 }
 749         }
 750
 751         toshiba_backlight_device = backlight_device_register("toshiba",
 752                                                 &toshiba_acpi.p_dev->dev,
 753                                                 NULL,
 754                                                 &toshiba_backlight_data);
 755         if (IS_ERR(toshiba_backlight_device)) {
 756                 ret = PTR_ERR(toshiba_backlight_device);
 757
 758                 printk(KERN_ERR "Could not register toshiba backlight device\n");
 759                 toshiba_backlight_device = NULL;
 760                 toshiba_acpi_exit();
 761                 return ret;
 762         }
 763         toshiba_backlight_device->props.max_brightness = HCI_LCD_BRIGHTNESS_LEVELS - 1;
 764
 765         /* Register rfkill switch for Bluetooth */
 766         if (hci_get_bt_present(&bt_present) == HCI_SUCCESS && bt_present) {
 767                 toshiba_acpi.bt_rfk = rfkill_alloc(toshiba_acpi.bt_name,
 768                                                    &toshiba_acpi.p_dev->dev,
 769                                                    RFKILL_TYPE_BLUETOOTH,
 770                                                    &toshiba_rfk_ops,
 771                                                    &toshiba_acpi);
 772                 if (!toshiba_acpi.bt_rfk) {
 773                         printk(MY_ERR "unable to allocate rfkill device\n");
 774                         toshiba_acpi_exit();
 775                         return -ENOMEM;
 776                 }
 777
 778                 ret = rfkill_register(toshiba_acpi.bt_rfk);
 779                 if (ret) {
 780                         printk(MY_ERR "unable to register rfkill device\n");
 781                         rfkill_destroy(toshiba_acpi.bt_rfk);
 782                         toshiba_acpi_exit();
 783                         return ret;
 784                 }
 785         }
 786
 787         return 0;
 788 }
 789
 790 module_init(toshiba_acpi_init);
 791 module_exit(toshiba_acpi_exit);