drivers/acpi/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 #include <linux/input-polldev.h>
  49
  50 #include <asm/uaccess.h>
  51
  52 #include <acpi/acpi_drivers.h>
  53
  54 MODULE_AUTHOR("John Belmonte");
  55 MODULE_DESCRIPTION("Toshiba Laptop ACPI Extras Driver");
  56 MODULE_LICENSE("GPL");
  57
  58 #define MY_LOGPREFIX "toshiba_acpi: "
  59 #define MY_ERR KERN_ERR MY_LOGPREFIX
  60 #define MY_NOTICE KERN_NOTICE MY_LOGPREFIX
  61 #define MY_INFO KERN_INFO MY_LOGPREFIX
  62
  63 /* Toshiba ACPI method paths */
  64 #define METHOD_LCD_BRIGHTNESS   "\\_SB_.PCI0.VGA_.LCD_._BCM"
  65 #define METHOD_HCI_1            "\\_SB_.VALD.GHCI"
  66 #define METHOD_HCI_2            "\\_SB_.VALZ.GHCI"
  67 #define METHOD_VIDEO_OUT        "\\_SB_.VALX.DSSX"
  68
  69 /* Toshiba HCI interface definitions
  70  *
  71  * HCI is Toshiba's "Hardware Control Interface" which is supposed to
  72  * be uniform across all their models.  Ideally we would just call
  73  * dedicated ACPI methods instead of using this primitive interface.
  74  * However the ACPI methods seem to be incomplete in some areas (for
  75  * example they allow setting, but not reading, the LCD brightness value),
  76  * so this is still useful.
  77  */
  78
  79 #define HCI_WORDS                       6
  80
  81 /* operations */
  82 #define HCI_SET                         0xff00
  83 #define HCI_GET                         0xfe00
  84
  85 /* return codes */
  86 #define HCI_SUCCESS                     0x0000
  87 #define HCI_FAILURE                     0x1000
  88 #define HCI_NOT_SUPPORTED               0x8000
  89 #define HCI_EMPTY                       0x8c00
  90
  91 /* registers */
  92 #define HCI_FAN                         0x0004
  93 #define HCI_SYSTEM_EVENT                0x0016
  94 #define HCI_VIDEO_OUT                   0x001c
  95 #define HCI_HOTKEY_EVENT                0x001e
  96 #define HCI_LCD_BRIGHTNESS              0x002a
  97 #define HCI_WIRELESS                    0x0056
  98
  99 /* field definitions */
 100 #define HCI_LCD_BRIGHTNESS_BITS         3
 101 #define HCI_LCD_BRIGHTNESS_SHIFT        (16-HCI_LCD_BRIGHTNESS_BITS)
 102 #define HCI_LCD_BRIGHTNESS_LEVELS       (1 << HCI_LCD_BRIGHTNESS_BITS)
 103 #define HCI_VIDEO_OUT_LCD               0x1
 104 #define HCI_VIDEO_OUT_CRT               0x2
 105 #define HCI_VIDEO_OUT_TV                0x4
 106 #define HCI_WIRELESS_KILL_SWITCH        0x01
 107 #define HCI_WIRELESS_BT_PRESENT         0x0f
 108 #define HCI_WIRELESS_BT_ATTACH          0x40
 109 #define HCI_WIRELESS_BT_POWER           0x80
 110
 111 static const struct acpi_device_id toshiba_device_ids[] = {
 112         {"TOS6200", 0},
 113         {"TOS6208", 0},
 114         {"TOS1900", 0},
 115         {"", 0},
 116 };
 117 MODULE_DEVICE_TABLE(acpi, toshiba_device_ids);
 118
 119 /* utility
 120  */
 121
 122 static __inline__ void _set_bit(u32 * word, u32 mask, int value)
 123 {
 124         *word = (*word & ~mask) | (mask * value);
 125 }
 126
 127 /* acpi interface wrappers
 128  */
 129
 130 static int is_valid_acpi_path(const char *methodName)
 131 {
 132         acpi_handle handle;
 133         acpi_status status;
 134
 135         status = acpi_get_handle(NULL, (char *)methodName, &handle);
 136         return !ACPI_FAILURE(status);
 137 }
 138
 139 static int write_acpi_int(const char *methodName, int val)
 140 {
 141         struct acpi_object_list params;
 142         union acpi_object in_objs[1];
 143         acpi_status status;
 144
 145         params.count = ARRAY_SIZE(in_objs);
 146         params.pointer = in_objs;
 147         in_objs[0].type = ACPI_TYPE_INTEGER;
 148         in_objs[0].integer.value = val;
 149
 150         status = acpi_evaluate_object(NULL, (char *)methodName, &params, NULL);
 151         return (status == AE_OK);
 152 }
 153
 154 #if 0
 155 static int read_acpi_int(const char *methodName, int *pVal)
 156 {
 157         struct acpi_buffer results;
 158         union acpi_object out_objs[1];
 159         acpi_status status;
 160
 161         results.length = sizeof(out_objs);
 162         results.pointer = out_objs;
 163
 164         status = acpi_evaluate_object(0, (char *)methodName, 0, &results);
 165         *pVal = out_objs[0].integer.value;
 166
 167         return (status == AE_OK) && (out_objs[0].type == ACPI_TYPE_INTEGER);
 168 }
 169 #endif
 170
 171 static const char *method_hci /*= 0*/ ;
 172
 173 /* Perform a raw HCI call.  Here we don't care about input or output buffer
 174  * format.
 175  */
 176 static acpi_status hci_raw(const u32 in[HCI_WORDS], u32 out[HCI_WORDS])
 177 {
 178         struct acpi_object_list params;
 179         union acpi_object in_objs[HCI_WORDS];
 180         struct acpi_buffer results;
 181         union acpi_object out_objs[HCI_WORDS + 1];
 182         acpi_status status;
 183         int i;
 184
 185         params.count = HCI_WORDS;
 186         params.pointer = in_objs;
 187         for (i = 0; i < HCI_WORDS; ++i) {
 188                 in_objs[i].type = ACPI_TYPE_INTEGER;
 189                 in_objs[i].integer.value = in[i];
 190         }
 191
 192         results.length = sizeof(out_objs);
 193         results.pointer = out_objs;
 194
 195         status = acpi_evaluate_object(NULL, (char *)method_hci, &params,
 196                                       &results);
 197         if ((status == AE_OK) && (out_objs->package.count <= HCI_WORDS)) {
 198                 for (i = 0; i < out_objs->package.count; ++i) {
 199                         out[i] = out_objs->package.elements[i].integer.value;
 200                 }
 201         }
 202
 203         return status;
 204 }
 205
 206 /* common hci tasks (get or set one or two value)
 207  *
 208  * In addition to the ACPI status, the HCI system returns a result which
 209  * may be useful (such as "not supported").
 210  */
 211
 212 static acpi_status hci_write1(u32 reg, u32 in1, u32 * result)
 213 {
 214         u32 in[HCI_WORDS] = { HCI_SET, reg, in1, 0, 0, 0 };
 215         u32 out[HCI_WORDS];
 216         acpi_status status = hci_raw(in, out);
 217         *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
 218         return status;
 219 }
 220
 221 static acpi_status hci_read1(u32 reg, u32 * out1, u32 * result)
 222 {
 223         u32 in[HCI_WORDS] = { HCI_GET, reg, 0, 0, 0, 0 };
 224         u32 out[HCI_WORDS];
 225         acpi_status status = hci_raw(in, out);
 226         *out1 = out[2];
 227         *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
 228         return status;
 229 }
 230
 231 static acpi_status hci_write2(u32 reg, u32 in1, u32 in2, u32 *result)
 232 {
 233         u32 in[HCI_WORDS] = { HCI_SET, reg, in1, in2, 0, 0 };
 234         u32 out[HCI_WORDS];
 235         acpi_status status = hci_raw(in, out);
 236         *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
 237         return status;
 238 }
 239
 240 static acpi_status hci_read2(u32 reg, u32 *out1, u32 *out2, u32 *result)
 241 {
 242         u32 in[HCI_WORDS] = { HCI_GET, reg, *out1, *out2, 0, 0 };
 243         u32 out[HCI_WORDS];
 244         acpi_status status = hci_raw(in, out);
 245         *out1 = out[2];
 246         *out2 = out[3];
 247         *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
 248         return status;
 249 }
 250
 251 struct toshiba_acpi_dev {
 252         struct platform_device *p_dev;
 253         struct rfkill *rfk_dev;
 254         struct input_polled_dev *poll_dev;
 255
 256         const char *bt_name;
 257         const char *rfk_name;
 258
 259         bool last_rfk_state;
 260
 261         struct mutex mutex;
 262 };
 263
 264 static struct toshiba_acpi_dev toshiba_acpi = {
 265         .bt_name = "Toshiba Bluetooth",
 266         .rfk_name = "Toshiba RFKill Switch",
 267         .last_rfk_state = false,
 268 };
 269
 270 /* Bluetooth rfkill handlers */
 271
 272 static u32 hci_get_bt_present(bool *present)
 273 {
 274         u32 hci_result;
 275         u32 value, value2;
 276
 277         value = 0;
 278         value2 = 0;
 279         hci_read2(HCI_WIRELESS, &value, &value2, &hci_result);
 280         if (hci_result == HCI_SUCCESS)
 281                 *present = (value & HCI_WIRELESS_BT_PRESENT) ? true : false;
 282
 283         return hci_result;
 284 }
 285
 286 static u32 hci_get_bt_on(bool *on)
 287 {
 288         u32 hci_result;
 289         u32 value, value2;
 290
 291         value = 0;
 292         value2 = 0x0001;
 293         hci_read2(HCI_WIRELESS, &value, &value2, &hci_result);
 294         if (hci_result == HCI_SUCCESS)
 295                 *on = (value & HCI_WIRELESS_BT_POWER) &&
 296                       (value & HCI_WIRELESS_BT_ATTACH);
 297
 298         return hci_result;
 299 }
 300
 301 static u32 hci_get_radio_state(bool *radio_state)
 302 {
 303         u32 hci_result;
 304         u32 value, value2;
 305
 306         value = 0;
 307         value2 = 0x0001;
 308         hci_read2(HCI_WIRELESS, &value, &value2, &hci_result);
 309
 310         *radio_state = value & HCI_WIRELESS_KILL_SWITCH;
 311         return hci_result;
 312 }
 313
 314 static int bt_rfkill_toggle_radio(void *data, enum rfkill_state state)
 315 {
 316         u32 result1, result2;
 317         u32 value;
 318         bool radio_state;
 319         struct toshiba_acpi_dev *dev = data;
 320
 321         value = (state == RFKILL_STATE_UNBLOCKED);
 322
 323         if (hci_get_radio_state(&radio_state) != HCI_SUCCESS)
 324                 return -EFAULT;
 325
 326         switch (state) {
 327         case RFKILL_STATE_UNBLOCKED:
 328                 if (!radio_state)
 329                         return -EPERM;
 330                 break;
 331         case RFKILL_STATE_SOFT_BLOCKED:
 332                 break;
 333         default:
 334                 return -EINVAL;
 335         }
 336
 337         mutex_lock(&dev->mutex);
 338         hci_write2(HCI_WIRELESS, value, HCI_WIRELESS_BT_POWER, &result1);
 339         hci_write2(HCI_WIRELESS, value, HCI_WIRELESS_BT_ATTACH, &result2);
 340         mutex_unlock(&dev->mutex);
 341
 342         if (result1 != HCI_SUCCESS || result2 != HCI_SUCCESS)
 343                 return -EFAULT;
 344
 345         return 0;
 346 }
 347
 348 static void bt_poll_rfkill(struct input_polled_dev *poll_dev)
 349 {
 350         bool state_changed;
 351         bool new_rfk_state;
 352         bool value;
 353         u32 hci_result;
 354         struct toshiba_acpi_dev *dev = poll_dev->private;
 355
 356         hci_result = hci_get_radio_state(&value);
 357         if (hci_result != HCI_SUCCESS)
 358                 return; /* Can't do anything useful */
 359
 360         new_rfk_state = value;
 361
 362         mutex_lock(&dev->mutex);
 363         state_changed = new_rfk_state != dev->last_rfk_state;
 364         dev->last_rfk_state = new_rfk_state;
 365         mutex_unlock(&dev->mutex);
 366
 367         if (unlikely(state_changed)) {
 368                 rfkill_force_state(dev->rfk_dev,
 369                                    new_rfk_state ?
 370                                    RFKILL_STATE_SOFT_BLOCKED :
 371                                    RFKILL_STATE_HARD_BLOCKED);
 372                 input_report_switch(poll_dev->input, SW_RFKILL_ALL,
 373                                     new_rfk_state);
 374         }
 375 }
 376
 377 static struct proc_dir_entry *toshiba_proc_dir /*= 0*/ ;
 378 static struct backlight_device *toshiba_backlight_device;
 379 static int force_fan;
 380 static int last_key_event;
 381 static int key_event_valid;
 382
 383 typedef struct _ProcItem {
 384         const char *name;
 385         char *(*read_func) (char *);
 386         unsigned long (*write_func) (const char *, unsigned long);
 387 } ProcItem;
 388
 389 /* proc file handlers
 390  */
 391
 392 static int
 393 dispatch_read(char *page, char **start, off_t off, int count, int *eof,
 394               ProcItem * item)
 395 {
 396         char *p = page;
 397         int len;
 398
 399         if (off == 0)
 400                 p = item->read_func(p);
 401
 402         /* ISSUE: I don't understand this code */
 403         len = (p - page);
 404         if (len <= off + count)
 405                 *eof = 1;
 406         *start = page + off;
 407         len -= off;
 408         if (len > count)
 409                 len = count;
 410         if (len < 0)
 411                 len = 0;
 412         return len;
 413 }
 414
 415 static int
 416 dispatch_write(struct file *file, const char __user * buffer,
 417                unsigned long count, ProcItem * item)
 418 {
 419         int result;
 420         char *tmp_buffer;
 421
 422         /* Arg buffer points to userspace memory, which can't be accessed
 423          * directly.  Since we're making a copy, zero-terminate the
 424          * destination so that sscanf can be used on it safely.
 425          */
 426         tmp_buffer = kmalloc(count + 1, GFP_KERNEL);
 427         if (!tmp_buffer)
 428                 return -ENOMEM;
 429
 430         if (copy_from_user(tmp_buffer, buffer, count)) {
 431                 result = -EFAULT;
 432         } else {
 433                 tmp_buffer[count] = 0;
 434                 result = item->write_func(tmp_buffer, count);
 435         }
 436         kfree(tmp_buffer);
 437         return result;
 438 }
 439
 440 static int get_lcd(struct backlight_device *bd)
 441 {
 442         u32 hci_result;
 443         u32 value;
 444
 445         hci_read1(HCI_LCD_BRIGHTNESS, &value, &hci_result);
 446         if (hci_result == HCI_SUCCESS) {
 447                 return (value >> HCI_LCD_BRIGHTNESS_SHIFT);
 448         } else
 449                 return -EFAULT;
 450 }
 451
 452 static char *read_lcd(char *p)
 453 {
 454         int value = get_lcd(NULL);
 455
 456         if (value >= 0) {
 457                 p += sprintf(p, "brightness:              %d\n", value);
 458                 p += sprintf(p, "brightness_levels:       %d\n",
 459                              HCI_LCD_BRIGHTNESS_LEVELS);
 460         } else {
 461                 printk(MY_ERR "Error reading LCD brightness\n");
 462         }
 463
 464         return p;
 465 }
 466
 467 static int set_lcd(int value)
 468 {
 469         u32 hci_result;
 470
 471         value = value << HCI_LCD_BRIGHTNESS_SHIFT;
 472         hci_write1(HCI_LCD_BRIGHTNESS, value, &hci_result);
 473         if (hci_result != HCI_SUCCESS)
 474                 return -EFAULT;
 475
 476         return 0;
 477 }
 478
 479 static int set_lcd_status(struct backlight_device *bd)
 480 {
 481         return set_lcd(bd->props.brightness);
 482 }
 483
 484 static unsigned long write_lcd(const char *buffer, unsigned long count)
 485 {
 486         int value;
 487         int ret;
 488
 489         if (sscanf(buffer, " brightness : %i", &value) == 1 &&
 490             value >= 0 && value < HCI_LCD_BRIGHTNESS_LEVELS) {
 491                 ret = set_lcd(value);
 492                 if (ret == 0)
 493                         ret = count;
 494         } else {
 495                 ret = -EINVAL;
 496         }
 497         return ret;
 498 }
 499
 500 static char *read_video(char *p)
 501 {
 502         u32 hci_result;
 503         u32 value;
 504
 505         hci_read1(HCI_VIDEO_OUT, &value, &hci_result);
 506         if (hci_result == HCI_SUCCESS) {
 507                 int is_lcd = (value & HCI_VIDEO_OUT_LCD) ? 1 : 0;
 508                 int is_crt = (value & HCI_VIDEO_OUT_CRT) ? 1 : 0;
 509                 int is_tv = (value & HCI_VIDEO_OUT_TV) ? 1 : 0;
 510                 p += sprintf(p, "lcd_out:                 %d\n", is_lcd);
 511                 p += sprintf(p, "crt_out:                 %d\n", is_crt);
 512                 p += sprintf(p, "tv_out:                  %d\n", is_tv);
 513         } else {
 514                 printk(MY_ERR "Error reading video out status\n");
 515         }
 516
 517         return p;
 518 }
 519
 520 static unsigned long write_video(const char *buffer, unsigned long count)
 521 {
 522         int value;
 523         int remain = count;
 524         int lcd_out = -1;
 525         int crt_out = -1;
 526         int tv_out = -1;
 527         u32 hci_result;
 528         u32 video_out;
 529
 530         /* scan expression.  Multiple expressions may be delimited with ;
 531          *
 532          *  NOTE: to keep scanning simple, invalid fields are ignored
 533          */
 534         while (remain) {
 535                 if (sscanf(buffer, " lcd_out : %i", &value) == 1)
 536                         lcd_out = value & 1;
 537                 else if (sscanf(buffer, " crt_out : %i", &value) == 1)
 538                         crt_out = value & 1;
 539                 else if (sscanf(buffer, " tv_out : %i", &value) == 1)
 540                         tv_out = value & 1;
 541                 /* advance to one character past the next ; */
 542                 do {
 543                         ++buffer;
 544                         --remain;
 545                 }
 546                 while (remain && *(buffer - 1) != ';');
 547         }
 548
 549         hci_read1(HCI_VIDEO_OUT, &video_out, &hci_result);
 550         if (hci_result == HCI_SUCCESS) {
 551                 unsigned int new_video_out = video_out;
 552                 if (lcd_out != -1)
 553                         _set_bit(&new_video_out, HCI_VIDEO_OUT_LCD, lcd_out);
 554                 if (crt_out != -1)
 555                         _set_bit(&new_video_out, HCI_VIDEO_OUT_CRT, crt_out);
 556                 if (tv_out != -1)
 557                         _set_bit(&new_video_out, HCI_VIDEO_OUT_TV, tv_out);
 558                 /* To avoid unnecessary video disruption, only write the new
 559                  * video setting if something changed. */
 560                 if (new_video_out != video_out)
 561                         write_acpi_int(METHOD_VIDEO_OUT, new_video_out);
 562         } else {
 563                 return -EFAULT;
 564         }
 565
 566         return count;
 567 }
 568
 569 static char *read_fan(char *p)
 570 {
 571         u32 hci_result;
 572         u32 value;
 573
 574         hci_read1(HCI_FAN, &value, &hci_result);
 575         if (hci_result == HCI_SUCCESS) {
 576                 p += sprintf(p, "running:                 %d\n", (value > 0));
 577                 p += sprintf(p, "force_on:                %d\n", force_fan);
 578         } else {
 579                 printk(MY_ERR "Error reading fan status\n");
 580         }
 581
 582         return p;
 583 }
 584
 585 static unsigned long write_fan(const char *buffer, unsigned long count)
 586 {
 587         int value;
 588         u32 hci_result;
 589
 590         if (sscanf(buffer, " force_on : %i", &value) == 1 &&
 591             value >= 0 && value <= 1) {
 592                 hci_write1(HCI_FAN, value, &hci_result);
 593                 if (hci_result != HCI_SUCCESS)
 594                         return -EFAULT;
 595                 else
 596                         force_fan = value;
 597         } else {
 598                 return -EINVAL;
 599         }
 600
 601         return count;
 602 }
 603
 604 static char *read_keys(char *p)
 605 {
 606         u32 hci_result;
 607         u32 value;
 608
 609         if (!key_event_valid) {
 610                 hci_read1(HCI_SYSTEM_EVENT, &value, &hci_result);
 611                 if (hci_result == HCI_SUCCESS) {
 612                         key_event_valid = 1;
 613                         last_key_event = value;
 614                 } else if (hci_result == HCI_EMPTY) {
 615                         /* better luck next time */
 616                 } else if (hci_result == HCI_NOT_SUPPORTED) {
 617                         /* This is a workaround for an unresolved issue on
 618                          * some machines where system events sporadically
 619                          * become disabled. */
 620                         hci_write1(HCI_SYSTEM_EVENT, 1, &hci_result);
 621                         printk(MY_NOTICE "Re-enabled hotkeys\n");
 622                 } else {
 623                         printk(MY_ERR "Error reading hotkey status\n");
 624                         goto end;
 625                 }
 626         }
 627
 628         p += sprintf(p, "hotkey_ready:            %d\n", key_event_valid);
 629         p += sprintf(p, "hotkey:                  0x%04x\n", last_key_event);
 630
 631       end:
 632         return p;
 633 }
 634
 635 static unsigned long write_keys(const char *buffer, unsigned long count)
 636 {
 637         int value;
 638
 639         if (sscanf(buffer, " hotkey_ready : %i", &value) == 1 && value == 0) {
 640                 key_event_valid = 0;
 641         } else {
 642                 return -EINVAL;
 643         }
 644
 645         return count;
 646 }
 647
 648 static char *read_version(char *p)
 649 {
 650         p += sprintf(p, "driver:                  %s\n", TOSHIBA_ACPI_VERSION);
 651         p += sprintf(p, "proc_interface:          %d\n",
 652                      PROC_INTERFACE_VERSION);
 653         return p;
 654 }
 655
 656 /* proc and module init
 657  */
 658
 659 #define PROC_TOSHIBA            "toshiba"
 660
 661 static ProcItem proc_items[] = {
 662         {"lcd", read_lcd, write_lcd},
 663         {"video", read_video, write_video},
 664         {"fan", read_fan, write_fan},
 665         {"keys", read_keys, write_keys},
 666         {"version", read_version, NULL},
 667         {NULL}
 668 };
 669
 670 static acpi_status __init add_device(void)
 671 {
 672         struct proc_dir_entry *proc;
 673         ProcItem *item;
 674
 675         for (item = proc_items; item->name; ++item) {
 676                 proc = create_proc_read_entry(item->name,
 677                                               S_IFREG | S_IRUGO | S_IWUSR,
 678                                               toshiba_proc_dir,
 679                                               (read_proc_t *) dispatch_read,
 680                                               item);
 681                 if (proc)
 682                         proc->owner = THIS_MODULE;
 683                 if (proc && item->write_func)
 684                         proc->write_proc = (write_proc_t *) dispatch_write;
 685         }
 686
 687         return AE_OK;
 688 }
 689
 690 static acpi_status remove_device(void)
 691 {
 692         ProcItem *item;
 693
 694         for (item = proc_items; item->name; ++item)
 695                 remove_proc_entry(item->name, toshiba_proc_dir);
 696         return AE_OK;
 697 }
 698
 699 static struct backlight_ops toshiba_backlight_data = {
 700         .get_brightness = get_lcd,
 701         .update_status  = set_lcd_status,
 702 };
 703
 704 static void toshiba_acpi_exit(void)
 705 {
 706         if (toshiba_acpi.poll_dev) {
 707                 input_unregister_polled_device(toshiba_acpi.poll_dev);
 708                 input_free_polled_device(toshiba_acpi.poll_dev);
 709         }
 710
 711         if (toshiba_acpi.rfk_dev)
 712                 rfkill_unregister(toshiba_acpi.rfk_dev);
 713
 714         if (toshiba_backlight_device)
 715                 backlight_device_unregister(toshiba_backlight_device);
 716
 717         remove_device();
 718
 719         if (toshiba_proc_dir)
 720                 remove_proc_entry(PROC_TOSHIBA, acpi_root_dir);
 721
 722         platform_device_unregister(toshiba_acpi.p_dev);
 723
 724         return;
 725 }
 726
 727 static int __init toshiba_acpi_init(void)
 728 {
 729         acpi_status status = AE_OK;
 730         u32 hci_result;
 731         bool bt_present;
 732         bool bt_on;
 733         bool radio_on;
 734         int ret = 0;
 735
 736         if (acpi_disabled)
 737                 return -ENODEV;
 738
 739         /* simple device detection: look for HCI method */
 740         if (is_valid_acpi_path(METHOD_HCI_1))
 741                 method_hci = METHOD_HCI_1;
 742         else if (is_valid_acpi_path(METHOD_HCI_2))
 743                 method_hci = METHOD_HCI_2;
 744         else
 745                 return -ENODEV;
 746
 747         printk(MY_INFO "Toshiba Laptop ACPI Extras version %s\n",
 748                TOSHIBA_ACPI_VERSION);
 749         printk(MY_INFO "    HCI method: %s\n", method_hci);
 750
 751         mutex_init(&toshiba_acpi.mutex);
 752
 753         toshiba_acpi.p_dev = platform_device_register_simple("toshiba_acpi",
 754                                                               -1, NULL, 0);
 755         if (IS_ERR(toshiba_acpi.p_dev)) {
 756                 ret = PTR_ERR(toshiba_acpi.p_dev);
 757                 printk(MY_ERR "unable to register platform device\n");
 758                 toshiba_acpi.p_dev = NULL;
 759                 toshiba_acpi_exit();
 760                 return ret;
 761         }
 762
 763         force_fan = 0;
 764         key_event_valid = 0;
 765
 766         /* enable event fifo */
 767         hci_write1(HCI_SYSTEM_EVENT, 1, &hci_result);
 768
 769         toshiba_proc_dir = proc_mkdir(PROC_TOSHIBA, acpi_root_dir);
 770         if (!toshiba_proc_dir) {
 771                 toshiba_acpi_exit();
 772                 return -ENODEV;
 773         } else {
 774                 toshiba_proc_dir->owner = THIS_MODULE;
 775                 status = add_device();
 776                 if (ACPI_FAILURE(status)) {
 777                         toshiba_acpi_exit();
 778                         return -ENODEV;
 779                 }
 780         }
 781
 782         toshiba_backlight_device = backlight_device_register("toshiba",
 783                                                 &toshiba_acpi.p_dev->dev,
 784                                                 NULL,
 785                                                 &toshiba_backlight_data);
 786         if (IS_ERR(toshiba_backlight_device)) {
 787                 ret = PTR_ERR(toshiba_backlight_device);
 788
 789                 printk(KERN_ERR "Could not register toshiba backlight device\n");
 790                 toshiba_backlight_device = NULL;
 791                 toshiba_acpi_exit();
 792                 return ret;
 793         }
 794         toshiba_backlight_device->props.max_brightness = HCI_LCD_BRIGHTNESS_LEVELS - 1;
 795
 796         /* Register rfkill switch for Bluetooth */
 797         if (hci_get_bt_present(&bt_present) == HCI_SUCCESS && bt_present) {
 798                 toshiba_acpi.rfk_dev = rfkill_allocate(&toshiba_acpi.p_dev->dev,
 799                                                         RFKILL_TYPE_BLUETOOTH);
 800                 if (!toshiba_acpi.rfk_dev) {
 801                         printk(MY_ERR "unable to allocate rfkill device\n");
 802                         toshiba_acpi_exit();
 803                         return -ENOMEM;
 804                 }
 805
 806                 toshiba_acpi.rfk_dev->name = toshiba_acpi.bt_name;
 807                 toshiba_acpi.rfk_dev->toggle_radio = bt_rfkill_toggle_radio;
 808                 toshiba_acpi.rfk_dev->user_claim_unsupported = 1;
 809                 toshiba_acpi.rfk_dev->data = &toshiba_acpi;
 810
 811                 if (hci_get_bt_on(&bt_on) == HCI_SUCCESS && bt_on) {
 812                         toshiba_acpi.rfk_dev->state = RFKILL_STATE_UNBLOCKED;
 813                 } else if (hci_get_radio_state(&radio_on) == HCI_SUCCESS &&
 814                            radio_on) {
 815                         toshiba_acpi.rfk_dev->state = RFKILL_STATE_SOFT_BLOCKED;
 816                 } else {
 817                         toshiba_acpi.rfk_dev->state = RFKILL_STATE_HARD_BLOCKED;
 818                 }
 819
 820                 ret = rfkill_register(toshiba_acpi.rfk_dev);
 821                 if (ret) {
 822                         printk(MY_ERR "unable to register rfkill device\n");
 823                         toshiba_acpi_exit();
 824                         return -ENOMEM;
 825                 }
 826         }
 827
 828         /* Register input device for kill switch */
 829         toshiba_acpi.poll_dev = input_allocate_polled_device();
 830         if (!toshiba_acpi.poll_dev) {
 831                 printk(MY_ERR "unable to allocate kill-switch input device\n");
 832                 toshiba_acpi_exit();
 833                 return -ENOMEM;
 834         }
 835         toshiba_acpi.poll_dev->private = &toshiba_acpi;
 836         toshiba_acpi.poll_dev->poll = bt_poll_rfkill;
 837         toshiba_acpi.poll_dev->poll_interval = 1000; /* msecs */
 838
 839         toshiba_acpi.poll_dev->input->name = toshiba_acpi.rfk_name;
 840         toshiba_acpi.poll_dev->input->id.bustype = BUS_HOST;
 841         toshiba_acpi.poll_dev->input->id.vendor = 0x0930; /* Toshiba USB ID */
 842         set_bit(EV_SW, toshiba_acpi.poll_dev->input->evbit);
 843         set_bit(SW_RFKILL_ALL, toshiba_acpi.poll_dev->input->swbit);
 844         input_report_switch(toshiba_acpi.poll_dev->input, SW_RFKILL_ALL, TRUE);
 845
 846         ret = input_register_polled_device(toshiba_acpi.poll_dev);
 847         if (ret) {
 848                 printk(MY_ERR "unable to register kill-switch input device\n");
 849                 rfkill_free(toshiba_acpi.rfk_dev);
 850                 toshiba_acpi.rfk_dev = NULL;
 851                 toshiba_acpi_exit();
 852                 return ret;
 853         }
 854
 855         return 0;
 856 }
 857
 858 module_init(toshiba_acpi_init);
 859 module_exit(toshiba_acpi_exit);