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         }
 339
 340         new_rfk_state = value;
 341
 342         mutex_unlock(&dev->mutex);
 343
 344         if (rfkill_set_hw_state(rfkill, !new_rfk_state))
 345                 bt_rfkill_set_block(data, true);
 346 }
 347
 348 static const struct rfkill_ops toshiba_rfk_ops = {
 349         .set_block = bt_rfkill_set_block,
 350         .poll = bt_rfkill_poll,
 351 };
 352
 353 static struct proc_dir_entry *toshiba_proc_dir /*= 0*/ ;
 354 static struct backlight_device *toshiba_backlight_device;
 355 static int force_fan;
 356 static int last_key_event;
 357 static int key_event_valid;
 358
 359 typedef struct _ProcItem {
 360         const char *name;
 361         char *(*read_func) (char *);
 362         unsigned long (*write_func) (const char *, unsigned long);
 363 } ProcItem;
 364
 365 /* proc file handlers
 366  */
 367
 368 static int
 369 dispatch_read(char *page, char **start, off_t off, int count, int *eof,
 370               ProcItem * item)
 371 {
 372         char *p = page;
 373         int len;
 374
 375         if (off == 0)
 376                 p = item->read_func(p);
 377
 378         /* ISSUE: I don't understand this code */
 379         len = (p - page);
 380         if (len <= off + count)
 381                 *eof = 1;
 382         *start = page + off;
 383         len -= off;
 384         if (len > count)
 385                 len = count;
 386         if (len < 0)
 387                 len = 0;
 388         return len;
 389 }
 390
 391 static int
 392 dispatch_write(struct file *file, const char __user * buffer,
 393                unsigned long count, ProcItem * item)
 394 {
 395         int result;
 396         char *tmp_buffer;
 397
 398         /* Arg buffer points to userspace memory, which can't be accessed
 399          * directly.  Since we're making a copy, zero-terminate the
 400          * destination so that sscanf can be used on it safely.
 401          */
 402         tmp_buffer = kmalloc(count + 1, GFP_KERNEL);
 403         if (!tmp_buffer)
 404                 return -ENOMEM;
 405
 406         if (copy_from_user(tmp_buffer, buffer, count)) {
 407                 result = -EFAULT;
 408         } else {
 409                 tmp_buffer[count] = 0;
 410                 result = item->write_func(tmp_buffer, count);
 411         }
 412         kfree(tmp_buffer);
 413         return result;
 414 }
 415
 416 static int get_lcd(struct backlight_device *bd)
 417 {
 418         u32 hci_result;
 419         u32 value;
 420
 421         hci_read1(HCI_LCD_BRIGHTNESS, &value, &hci_result);
 422         if (hci_result == HCI_SUCCESS) {
 423                 return (value >> HCI_LCD_BRIGHTNESS_SHIFT);
 424         } else
 425                 return -EFAULT;
 426 }
 427
 428 static char *read_lcd(char *p)
 429 {
 430         int value = get_lcd(NULL);
 431
 432         if (value >= 0) {
 433                 p += sprintf(p, "brightness:              %d\n", value);
 434                 p += sprintf(p, "brightness_levels:       %d\n",
 435                              HCI_LCD_BRIGHTNESS_LEVELS);
 436         } else {
 437                 printk(MY_ERR "Error reading LCD brightness\n");
 438         }
 439
 440         return p;
 441 }
 442
 443 static int set_lcd(int value)
 444 {
 445         u32 hci_result;
 446
 447         value = value << HCI_LCD_BRIGHTNESS_SHIFT;
 448         hci_write1(HCI_LCD_BRIGHTNESS, value, &hci_result);
 449         if (hci_result != HCI_SUCCESS)
 450                 return -EFAULT;
 451
 452         return 0;
 453 }
 454
 455 static int set_lcd_status(struct backlight_device *bd)
 456 {
 457         return set_lcd(bd->props.brightness);
 458 }
 459
 460 static unsigned long write_lcd(const char *buffer, unsigned long count)
 461 {
 462         int value;
 463         int ret;
 464
 465         if (sscanf(buffer, " brightness : %i", &value) == 1 &&
 466             value >= 0 && value < HCI_LCD_BRIGHTNESS_LEVELS) {
 467                 ret = set_lcd(value);
 468                 if (ret == 0)
 469                         ret = count;
 470         } else {
 471                 ret = -EINVAL;
 472         }
 473         return ret;
 474 }
 475
 476 static char *read_video(char *p)
 477 {
 478         u32 hci_result;
 479         u32 value;
 480
 481         hci_read1(HCI_VIDEO_OUT, &value, &hci_result);
 482         if (hci_result == HCI_SUCCESS) {
 483                 int is_lcd = (value & HCI_VIDEO_OUT_LCD) ? 1 : 0;
 484                 int is_crt = (value & HCI_VIDEO_OUT_CRT) ? 1 : 0;
 485                 int is_tv = (value & HCI_VIDEO_OUT_TV) ? 1 : 0;
 486                 p += sprintf(p, "lcd_out:                 %d\n", is_lcd);
 487                 p += sprintf(p, "crt_out:                 %d\n", is_crt);
 488                 p += sprintf(p, "tv_out:                  %d\n", is_tv);
 489         } else {
 490                 printk(MY_ERR "Error reading video out status\n");
 491         }
 492
 493         return p;
 494 }
 495
 496 static unsigned long write_video(const char *buffer, unsigned long count)
 497 {
 498         int value;
 499         int remain = count;
 500         int lcd_out = -1;
 501         int crt_out = -1;
 502         int tv_out = -1;
 503         u32 hci_result;
 504         u32 video_out;
 505
 506         /* scan expression.  Multiple expressions may be delimited with ;
 507          *
 508          *  NOTE: to keep scanning simple, invalid fields are ignored
 509          */
 510         while (remain) {
 511                 if (sscanf(buffer, " lcd_out : %i", &value) == 1)
 512                         lcd_out = value & 1;
 513                 else if (sscanf(buffer, " crt_out : %i", &value) == 1)
 514                         crt_out = value & 1;
 515                 else if (sscanf(buffer, " tv_out : %i", &value) == 1)
 516                         tv_out = value & 1;
 517                 /* advance to one character past the next ; */
 518                 do {
 519                         ++buffer;
 520                         --remain;
 521                 }
 522                 while (remain && *(buffer - 1) != ';');
 523         }
 524
 525         hci_read1(HCI_VIDEO_OUT, &video_out, &hci_result);
 526         if (hci_result == HCI_SUCCESS) {
 527                 unsigned int new_video_out = video_out;
 528                 if (lcd_out != -1)
 529                         _set_bit(&new_video_out, HCI_VIDEO_OUT_LCD, lcd_out);
 530                 if (crt_out != -1)
 531                         _set_bit(&new_video_out, HCI_VIDEO_OUT_CRT, crt_out);
 532                 if (tv_out != -1)
 533                         _set_bit(&new_video_out, HCI_VIDEO_OUT_TV, tv_out);
 534                 /* To avoid unnecessary video disruption, only write the new
 535                  * video setting if something changed. */
 536                 if (new_video_out != video_out)
 537                         write_acpi_int(METHOD_VIDEO_OUT, new_video_out);
 538         } else {
 539                 return -EFAULT;
 540         }
 541
 542         return count;
 543 }
 544
 545 static char *read_fan(char *p)
 546 {
 547         u32 hci_result;
 548         u32 value;
 549
 550         hci_read1(HCI_FAN, &value, &hci_result);
 551         if (hci_result == HCI_SUCCESS) {
 552                 p += sprintf(p, "running:                 %d\n", (value > 0));
 553                 p += sprintf(p, "force_on:                %d\n", force_fan);
 554         } else {
 555                 printk(MY_ERR "Error reading fan status\n");
 556         }
 557
 558         return p;
 559 }
 560
 561 static unsigned long write_fan(const char *buffer, unsigned long count)
 562 {
 563         int value;
 564         u32 hci_result;
 565
 566         if (sscanf(buffer, " force_on : %i", &value) == 1 &&
 567             value >= 0 && value <= 1) {
 568                 hci_write1(HCI_FAN, value, &hci_result);
 569                 if (hci_result != HCI_SUCCESS)
 570                         return -EFAULT;
 571                 else
 572                         force_fan = value;
 573         } else {
 574                 return -EINVAL;
 575         }
 576
 577         return count;
 578 }
 579
 580 static char *read_keys(char *p)
 581 {
 582         u32 hci_result;
 583         u32 value;
 584
 585         if (!key_event_valid) {
 586                 hci_read1(HCI_SYSTEM_EVENT, &value, &hci_result);
 587                 if (hci_result == HCI_SUCCESS) {
 588                         key_event_valid = 1;
 589                         last_key_event = value;
 590                 } else if (hci_result == HCI_EMPTY) {
 591                         /* better luck next time */
 592                 } else if (hci_result == HCI_NOT_SUPPORTED) {
 593                         /* This is a workaround for an unresolved issue on
 594                          * some machines where system events sporadically
 595                          * become disabled. */
 596                         hci_write1(HCI_SYSTEM_EVENT, 1, &hci_result);
 597                         printk(MY_NOTICE "Re-enabled hotkeys\n");
 598                 } else {
 599                         printk(MY_ERR "Error reading hotkey status\n");
 600                         goto end;
 601                 }
 602         }
 603
 604         p += sprintf(p, "hotkey_ready:            %d\n", key_event_valid);
 605         p += sprintf(p, "hotkey:                  0x%04x\n", last_key_event);
 606
 607       end:
 608         return p;
 609 }
 610
 611 static unsigned long write_keys(const char *buffer, unsigned long count)
 612 {
 613         int value;
 614
 615         if (sscanf(buffer, " hotkey_ready : %i", &value) == 1 && value == 0) {
 616                 key_event_valid = 0;
 617         } else {
 618                 return -EINVAL;
 619         }
 620
 621         return count;
 622 }
 623
 624 static char *read_version(char *p)
 625 {
 626         p += sprintf(p, "driver:                  %s\n", TOSHIBA_ACPI_VERSION);
 627         p += sprintf(p, "proc_interface:          %d\n",
 628                      PROC_INTERFACE_VERSION);
 629         return p;
 630 }
 631
 632 /* proc and module init
 633  */
 634
 635 #define PROC_TOSHIBA            "toshiba"
 636
 637 static ProcItem proc_items[] = {
 638         {"lcd", read_lcd, write_lcd},
 639         {"video", read_video, write_video},
 640         {"fan", read_fan, write_fan},
 641         {"keys", read_keys, write_keys},
 642         {"version", read_version, NULL},
 643         {NULL}
 644 };
 645
 646 static acpi_status __init add_device(void)
 647 {
 648         struct proc_dir_entry *proc;
 649         ProcItem *item;
 650
 651         for (item = proc_items; item->name; ++item) {
 652                 proc = create_proc_read_entry(item->name,
 653                                               S_IFREG | S_IRUGO | S_IWUSR,
 654                                               toshiba_proc_dir,
 655                                               (read_proc_t *) dispatch_read,
 656                                               item);
 657                 if (proc && item->write_func)
 658                         proc->write_proc = (write_proc_t *) dispatch_write;
 659         }
 660
 661         return AE_OK;
 662 }
 663
 664 static acpi_status remove_device(void)
 665 {
 666         ProcItem *item;
 667
 668         for (item = proc_items; item->name; ++item)
 669                 remove_proc_entry(item->name, toshiba_proc_dir);
 670         return AE_OK;
 671 }
 672
 673 static struct backlight_ops toshiba_backlight_data = {
 674         .get_brightness = get_lcd,
 675         .update_status  = set_lcd_status,
 676 };
 677
 678 static void toshiba_acpi_exit(void)
 679 {
 680         if (toshiba_acpi.bt_rfk) {
 681                 rfkill_unregister(toshiba_acpi.bt_rfk);
 682                 rfkill_destroy(toshiba_acpi.bt_rfk);
 683         }
 684
 685         if (toshiba_backlight_device)
 686                 backlight_device_unregister(toshiba_backlight_device);
 687
 688         remove_device();
 689
 690         if (toshiba_proc_dir)
 691                 remove_proc_entry(PROC_TOSHIBA, acpi_root_dir);
 692
 693         platform_device_unregister(toshiba_acpi.p_dev);
 694
 695         return;
 696 }
 697
 698 static int __init toshiba_acpi_init(void)
 699 {
 700         acpi_status status = AE_OK;
 701         u32 hci_result;
 702         bool bt_present;
 703         int ret = 0;
 704
 705         if (acpi_disabled)
 706                 return -ENODEV;
 707
 708         /* simple device detection: look for HCI method */
 709         if (is_valid_acpi_path(METHOD_HCI_1))
 710                 method_hci = METHOD_HCI_1;
 711         else if (is_valid_acpi_path(METHOD_HCI_2))
 712                 method_hci = METHOD_HCI_2;
 713         else
 714                 return -ENODEV;
 715
 716         printk(MY_INFO "Toshiba Laptop ACPI Extras version %s\n",
 717                TOSHIBA_ACPI_VERSION);
 718         printk(MY_INFO "    HCI method: %s\n", method_hci);
 719
 720         mutex_init(&toshiba_acpi.mutex);
 721
 722         toshiba_acpi.p_dev = platform_device_register_simple("toshiba_acpi",
 723                                                               -1, NULL, 0);
 724         if (IS_ERR(toshiba_acpi.p_dev)) {
 725                 ret = PTR_ERR(toshiba_acpi.p_dev);
 726                 printk(MY_ERR "unable to register platform device\n");
 727                 toshiba_acpi.p_dev = NULL;
 728                 toshiba_acpi_exit();
 729                 return ret;
 730         }
 731
 732         force_fan = 0;
 733         key_event_valid = 0;
 734
 735         /* enable event fifo */
 736         hci_write1(HCI_SYSTEM_EVENT, 1, &hci_result);
 737
 738         toshiba_proc_dir = proc_mkdir(PROC_TOSHIBA, acpi_root_dir);
 739         if (!toshiba_proc_dir) {
 740                 toshiba_acpi_exit();
 741                 return -ENODEV;
 742         } else {
 743                 status = add_device();
 744                 if (ACPI_FAILURE(status)) {
 745                         toshiba_acpi_exit();
 746                         return -ENODEV;
 747                 }
 748         }
 749
 750         toshiba_backlight_device = backlight_device_register("toshiba",
 751                                                 &toshiba_acpi.p_dev->dev,
 752                                                 NULL,
 753                                                 &toshiba_backlight_data);
 754         if (IS_ERR(toshiba_backlight_device)) {
 755                 ret = PTR_ERR(toshiba_backlight_device);
 756
 757                 printk(KERN_ERR "Could not register toshiba backlight device\n");
 758                 toshiba_backlight_device = NULL;
 759                 toshiba_acpi_exit();
 760                 return ret;
 761         }
 762         toshiba_backlight_device->props.max_brightness = HCI_LCD_BRIGHTNESS_LEVELS - 1;
 763
 764         /* Register rfkill switch for Bluetooth */
 765         if (hci_get_bt_present(&bt_present) == HCI_SUCCESS && bt_present) {
 766                 toshiba_acpi.bt_rfk = rfkill_alloc(toshiba_acpi.bt_name,
 767                                                    &toshiba_acpi.p_dev->dev,
 768                                                    RFKILL_TYPE_BLUETOOTH,
 769                                                    &toshiba_rfk_ops,
 770                                                    &toshiba_acpi);
 771                 if (!toshiba_acpi.bt_rfk) {
 772                         printk(MY_ERR "unable to allocate rfkill device\n");
 773                         toshiba_acpi_exit();
 774                         return -ENOMEM;
 775                 }
 776
 777                 ret = rfkill_register(toshiba_acpi.bt_rfk);
 778                 if (ret) {
 779                         printk(MY_ERR "unable to register rfkill device\n");
 780                         rfkill_destroy(toshiba_acpi.bt_rfk);
 781                         toshiba_acpi_exit();
 782                         return ret;
 783                 }
 784         }
 785
 786         return 0;
 787 }
 788
 789 module_init(toshiba_acpi_init);
 790 module_exit(toshiba_acpi_exit);