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  *  Copyright (C) 2010 Pierre Ducroquet
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  *
  24  *  The devolpment page for this driver is located at
  25  *  http://memebeam.org/toys/ToshibaAcpiDriver.
  26  *
  27  *  Credits:
  28  *      Jonathan A. Buzzard - Toshiba HCI info, and critical tips on reverse
  29  *              engineering the Windows drivers
  30  *      Yasushi Nagato - changes for linux kernel 2.4 -> 2.5
  31  *      Rob Miller - TV out and hotkeys help
  32  *
  33  *
  34  *  TODO
  35  *
  36  */
  37
  38 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  39
  40 #define TOSHIBA_ACPI_VERSION    "0.19"
  41 #define PROC_INTERFACE_VERSION  1
  42
  43 #include <linux/kernel.h>
  44 #include <linux/module.h>
  45 #include <linux/init.h>
  46 #include <linux/types.h>
  47 #include <linux/proc_fs.h>
  48 #include <linux/seq_file.h>
  49 #include <linux/backlight.h>
  50 #include <linux/rfkill.h>
  51 #include <linux/input.h>
  52 #include <linux/input/sparse-keymap.h>
  53 #include <linux/leds.h>
  54 #include <linux/slab.h>
  55 #include <linux/workqueue.h>
  56 #include <linux/i8042.h>
  57
  58 #include <asm/uaccess.h>
  59
  60 #include <acpi/acpi_drivers.h>
  61
  62 MODULE_AUTHOR("John Belmonte");
  63 MODULE_DESCRIPTION("Toshiba Laptop ACPI Extras Driver");
  64 MODULE_LICENSE("GPL");
  65
  66 #define TOSHIBA_WMI_EVENT_GUID "59142400-C6A3-40FA-BADB-8A2652834100"
  67
  68 /* Scan code for Fn key on TOS1900 models */
  69 #define TOS1900_FN_SCAN         0x6e
  70
  71 /* Toshiba ACPI method paths */
  72 #define METHOD_VIDEO_OUT        "\\_SB_.VALX.DSSX"
  73
  74 /* Toshiba HCI interface definitions
  75  *
  76  * HCI is Toshiba's "Hardware Control Interface" which is supposed to
  77  * be uniform across all their models.  Ideally we would just call
  78  * dedicated ACPI methods instead of using this primitive interface.
  79  * However the ACPI methods seem to be incomplete in some areas (for
  80  * example they allow setting, but not reading, the LCD brightness value),
  81  * so this is still useful.
  82  */
  83
  84 #define HCI_WORDS                       6
  85
  86 /* operations */
  87 #define HCI_SET                         0xff00
  88 #define HCI_GET                         0xfe00
  89
  90 /* return codes */
  91 #define HCI_SUCCESS                     0x0000
  92 #define HCI_FAILURE                     0x1000
  93 #define HCI_NOT_SUPPORTED               0x8000
  94 #define HCI_EMPTY                       0x8c00
  95
  96 /* registers */
  97 #define HCI_FAN                         0x0004
  98 #define HCI_TR_BACKLIGHT                0x0005
  99 #define HCI_SYSTEM_EVENT                0x0016
 100 #define HCI_VIDEO_OUT                   0x001c
 101 #define HCI_HOTKEY_EVENT                0x001e
 102 #define HCI_LCD_BRIGHTNESS              0x002a
 103 #define HCI_WIRELESS                    0x0056
 104
 105 /* field definitions */
 106 #define HCI_HOTKEY_DISABLE              0x0b
 107 #define HCI_HOTKEY_ENABLE               0x09
 108 #define HCI_LCD_BRIGHTNESS_BITS         3
 109 #define HCI_LCD_BRIGHTNESS_SHIFT        (16-HCI_LCD_BRIGHTNESS_BITS)
 110 #define HCI_LCD_BRIGHTNESS_LEVELS       (1 << HCI_LCD_BRIGHTNESS_BITS)
 111 #define HCI_VIDEO_OUT_LCD               0x1
 112 #define HCI_VIDEO_OUT_CRT               0x2
 113 #define HCI_VIDEO_OUT_TV                0x4
 114 #define HCI_WIRELESS_KILL_SWITCH        0x01
 115 #define HCI_WIRELESS_BT_PRESENT         0x0f
 116 #define HCI_WIRELESS_BT_ATTACH          0x40
 117 #define HCI_WIRELESS_BT_POWER           0x80
 118
 119 struct toshiba_acpi_dev {
 120         struct acpi_device *acpi_dev;
 121         const char *method_hci;
 122         struct rfkill *bt_rfk;
 123         struct input_dev *hotkey_dev;
 124         struct work_struct hotkey_work;
 125         struct backlight_device *backlight_dev;
 126         struct led_classdev led_dev;
 127
 128         int force_fan;
 129         int last_key_event;
 130         int key_event_valid;
 131
 132         unsigned int illumination_supported:1;
 133         unsigned int video_supported:1;
 134         unsigned int fan_supported:1;
 135         unsigned int system_event_supported:1;
 136         unsigned int ntfy_supported:1;
 137         unsigned int info_supported:1;
 138         unsigned int tr_backlight_supported:1;
 139
 140         struct mutex mutex;
 141 };
 142
 143 static struct toshiba_acpi_dev *toshiba_acpi;
 144
 145 static const struct acpi_device_id toshiba_device_ids[] = {
 146         {"TOS6200", 0},
 147         {"TOS6208", 0},
 148         {"TOS1900", 0},
 149         {"", 0},
 150 };
 151 MODULE_DEVICE_TABLE(acpi, toshiba_device_ids);
 152
 153 static const struct key_entry toshiba_acpi_keymap[] = {
 154         { KE_KEY, 0x101, { KEY_MUTE } },
 155         { KE_KEY, 0x102, { KEY_ZOOMOUT } },
 156         { KE_KEY, 0x103, { KEY_ZOOMIN } },
 157         { KE_KEY, 0x12c, { KEY_KBDILLUMTOGGLE } },
 158         { KE_KEY, 0x139, { KEY_ZOOMRESET } },
 159         { KE_KEY, 0x13b, { KEY_COFFEE } },
 160         { KE_KEY, 0x13c, { KEY_BATTERY } },
 161         { KE_KEY, 0x13d, { KEY_SLEEP } },
 162         { KE_KEY, 0x13e, { KEY_SUSPEND } },
 163         { KE_KEY, 0x13f, { KEY_SWITCHVIDEOMODE } },
 164         { KE_KEY, 0x140, { KEY_BRIGHTNESSDOWN } },
 165         { KE_KEY, 0x141, { KEY_BRIGHTNESSUP } },
 166         { KE_KEY, 0x142, { KEY_WLAN } },
 167         { KE_KEY, 0x143, { KEY_TOUCHPAD_TOGGLE } },
 168         { KE_KEY, 0x17f, { KEY_FN } },
 169         { KE_KEY, 0xb05, { KEY_PROG2 } },
 170         { KE_KEY, 0xb06, { KEY_WWW } },
 171         { KE_KEY, 0xb07, { KEY_MAIL } },
 172         { KE_KEY, 0xb30, { KEY_STOP } },
 173         { KE_KEY, 0xb31, { KEY_PREVIOUSSONG } },
 174         { KE_KEY, 0xb32, { KEY_NEXTSONG } },
 175         { KE_KEY, 0xb33, { KEY_PLAYPAUSE } },
 176         { KE_KEY, 0xb5a, { KEY_MEDIA } },
 177         { KE_IGNORE, 0x1430, { KEY_RESERVED } },
 178         { KE_END, 0 },
 179 };
 180
 181 /* utility
 182  */
 183
 184 static __inline__ void _set_bit(u32 * word, u32 mask, int value)
 185 {
 186         *word = (*word & ~mask) | (mask * value);
 187 }
 188
 189 /* acpi interface wrappers
 190  */
 191
 192 static int write_acpi_int(const char *methodName, int val)
 193 {
 194         acpi_status status;
 195
 196         status = acpi_execute_simple_method(NULL, (char *)methodName, val);
 197         return (status == AE_OK) ? 0 : -EIO;
 198 }
 199
 200 /* Perform a raw HCI call.  Here we don't care about input or output buffer
 201  * format.
 202  */
 203 static acpi_status hci_raw(struct toshiba_acpi_dev *dev,
 204                            const u32 in[HCI_WORDS], u32 out[HCI_WORDS])
 205 {
 206         struct acpi_object_list params;
 207         union acpi_object in_objs[HCI_WORDS];
 208         struct acpi_buffer results;
 209         union acpi_object out_objs[HCI_WORDS + 1];
 210         acpi_status status;
 211         int i;
 212
 213         params.count = HCI_WORDS;
 214         params.pointer = in_objs;
 215         for (i = 0; i < HCI_WORDS; ++i) {
 216                 in_objs[i].type = ACPI_TYPE_INTEGER;
 217                 in_objs[i].integer.value = in[i];
 218         }
 219
 220         results.length = sizeof(out_objs);
 221         results.pointer = out_objs;
 222
 223         status = acpi_evaluate_object(dev->acpi_dev->handle,
 224                                       (char *)dev->method_hci, &params,
 225                                       &results);
 226         if ((status == AE_OK) && (out_objs->package.count <= HCI_WORDS)) {
 227                 for (i = 0; i < out_objs->package.count; ++i) {
 228                         out[i] = out_objs->package.elements[i].integer.value;
 229                 }
 230         }
 231
 232         return status;
 233 }
 234
 235 /* common hci tasks (get or set one or two value)
 236  *
 237  * In addition to the ACPI status, the HCI system returns a result which
 238  * may be useful (such as "not supported").
 239  */
 240
 241 static acpi_status hci_write1(struct toshiba_acpi_dev *dev, u32 reg,
 242                               u32 in1, u32 *result)
 243 {
 244         u32 in[HCI_WORDS] = { HCI_SET, reg, in1, 0, 0, 0 };
 245         u32 out[HCI_WORDS];
 246         acpi_status status = hci_raw(dev, in, out);
 247         *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
 248         return status;
 249 }
 250
 251 static acpi_status hci_read1(struct toshiba_acpi_dev *dev, u32 reg,
 252                              u32 *out1, u32 *result)
 253 {
 254         u32 in[HCI_WORDS] = { HCI_GET, reg, 0, 0, 0, 0 };
 255         u32 out[HCI_WORDS];
 256         acpi_status status = hci_raw(dev, in, out);
 257         *out1 = out[2];
 258         *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
 259         return status;
 260 }
 261
 262 static acpi_status hci_write2(struct toshiba_acpi_dev *dev, u32 reg,
 263                               u32 in1, u32 in2, u32 *result)
 264 {
 265         u32 in[HCI_WORDS] = { HCI_SET, reg, in1, in2, 0, 0 };
 266         u32 out[HCI_WORDS];
 267         acpi_status status = hci_raw(dev, in, out);
 268         *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
 269         return status;
 270 }
 271
 272 static acpi_status hci_read2(struct toshiba_acpi_dev *dev, u32 reg,
 273                              u32 *out1, u32 *out2, u32 *result)
 274 {
 275         u32 in[HCI_WORDS] = { HCI_GET, reg, *out1, *out2, 0, 0 };
 276         u32 out[HCI_WORDS];
 277         acpi_status status = hci_raw(dev, in, out);
 278         *out1 = out[2];
 279         *out2 = out[3];
 280         *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
 281         return status;
 282 }
 283
 284 /* Illumination support */
 285 static int toshiba_illumination_available(struct toshiba_acpi_dev *dev)
 286 {
 287         u32 in[HCI_WORDS] = { 0, 0, 0, 0, 0, 0 };
 288         u32 out[HCI_WORDS];
 289         acpi_status status;
 290
 291         in[0] = 0xf100;
 292         status = hci_raw(dev, in, out);
 293         if (ACPI_FAILURE(status)) {
 294                 pr_info("Illumination device not available\n");
 295                 return 0;
 296         }
 297         in[0] = 0xf400;
 298         status = hci_raw(dev, in, out);
 299         return 1;
 300 }
 301
 302 static void toshiba_illumination_set(struct led_classdev *cdev,
 303                                      enum led_brightness brightness)
 304 {
 305         struct toshiba_acpi_dev *dev = container_of(cdev,
 306                         struct toshiba_acpi_dev, led_dev);
 307         u32 in[HCI_WORDS] = { 0, 0, 0, 0, 0, 0 };
 308         u32 out[HCI_WORDS];
 309         acpi_status status;
 310
 311         /* First request : initialize communication. */
 312         in[0] = 0xf100;
 313         status = hci_raw(dev, in, out);
 314         if (ACPI_FAILURE(status)) {
 315                 pr_info("Illumination device not available\n");
 316                 return;
 317         }
 318
 319         if (brightness) {
 320                 /* Switch the illumination on */
 321                 in[0] = 0xf400;
 322                 in[1] = 0x14e;
 323                 in[2] = 1;
 324                 status = hci_raw(dev, in, out);
 325                 if (ACPI_FAILURE(status)) {
 326                         pr_info("ACPI call for illumination failed\n");
 327                         return;
 328                 }
 329         } else {
 330                 /* Switch the illumination off */
 331                 in[0] = 0xf400;
 332                 in[1] = 0x14e;
 333                 in[2] = 0;
 334                 status = hci_raw(dev, in, out);
 335                 if (ACPI_FAILURE(status)) {
 336                         pr_info("ACPI call for illumination failed.\n");
 337                         return;
 338                 }
 339         }
 340
 341         /* Last request : close communication. */
 342         in[0] = 0xf200;
 343         in[1] = 0;
 344         in[2] = 0;
 345         hci_raw(dev, in, out);
 346 }
 347
 348 static enum led_brightness toshiba_illumination_get(struct led_classdev *cdev)
 349 {
 350         struct toshiba_acpi_dev *dev = container_of(cdev,
 351                         struct toshiba_acpi_dev, led_dev);
 352         u32 in[HCI_WORDS] = { 0, 0, 0, 0, 0, 0 };
 353         u32 out[HCI_WORDS];
 354         acpi_status status;
 355         enum led_brightness result;
 356
 357         /* First request : initialize communication. */
 358         in[0] = 0xf100;
 359         status = hci_raw(dev, in, out);
 360         if (ACPI_FAILURE(status)) {
 361                 pr_info("Illumination device not available\n");
 362                 return LED_OFF;
 363         }
 364
 365         /* Check the illumination */
 366         in[0] = 0xf300;
 367         in[1] = 0x14e;
 368         status = hci_raw(dev, in, out);
 369         if (ACPI_FAILURE(status)) {
 370                 pr_info("ACPI call for illumination failed.\n");
 371                 return LED_OFF;
 372         }
 373
 374         result = out[2] ? LED_FULL : LED_OFF;
 375
 376         /* Last request : close communication. */
 377         in[0] = 0xf200;
 378         in[1] = 0;
 379         in[2] = 0;
 380         hci_raw(dev, in, out);
 381
 382         return result;
 383 }
 384
 385 /* Bluetooth rfkill handlers */
 386
 387 static u32 hci_get_bt_present(struct toshiba_acpi_dev *dev, bool *present)
 388 {
 389         u32 hci_result;
 390         u32 value, value2;
 391
 392         value = 0;
 393         value2 = 0;
 394         hci_read2(dev, HCI_WIRELESS, &value, &value2, &hci_result);
 395         if (hci_result == HCI_SUCCESS)
 396                 *present = (value & HCI_WIRELESS_BT_PRESENT) ? true : false;
 397
 398         return hci_result;
 399 }
 400
 401 static u32 hci_get_radio_state(struct toshiba_acpi_dev *dev, bool *radio_state)
 402 {
 403         u32 hci_result;
 404         u32 value, value2;
 405
 406         value = 0;
 407         value2 = 0x0001;
 408         hci_read2(dev, HCI_WIRELESS, &value, &value2, &hci_result);
 409
 410         *radio_state = value & HCI_WIRELESS_KILL_SWITCH;
 411         return hci_result;
 412 }
 413
 414 static int bt_rfkill_set_block(void *data, bool blocked)
 415 {
 416         struct toshiba_acpi_dev *dev = data;
 417         u32 result1, result2;
 418         u32 value;
 419         int err;
 420         bool radio_state;
 421
 422         value = (blocked == false);
 423
 424         mutex_lock(&dev->mutex);
 425         if (hci_get_radio_state(dev, &radio_state) != HCI_SUCCESS) {
 426                 err = -EIO;
 427                 goto out;
 428         }
 429
 430         if (!radio_state) {
 431                 err = 0;
 432                 goto out;
 433         }
 434
 435         hci_write2(dev, HCI_WIRELESS, value, HCI_WIRELESS_BT_POWER, &result1);
 436         hci_write2(dev, HCI_WIRELESS, value, HCI_WIRELESS_BT_ATTACH, &result2);
 437
 438         if (result1 != HCI_SUCCESS || result2 != HCI_SUCCESS)
 439                 err = -EIO;
 440         else
 441                 err = 0;
 442  out:
 443         mutex_unlock(&dev->mutex);
 444         return err;
 445 }
 446
 447 static void bt_rfkill_poll(struct rfkill *rfkill, void *data)
 448 {
 449         bool new_rfk_state;
 450         bool value;
 451         u32 hci_result;
 452         struct toshiba_acpi_dev *dev = data;
 453
 454         mutex_lock(&dev->mutex);
 455
 456         hci_result = hci_get_radio_state(dev, &value);
 457         if (hci_result != HCI_SUCCESS) {
 458                 /* Can't do anything useful */
 459                 mutex_unlock(&dev->mutex);
 460                 return;
 461         }
 462
 463         new_rfk_state = value;
 464
 465         mutex_unlock(&dev->mutex);
 466
 467         if (rfkill_set_hw_state(rfkill, !new_rfk_state))
 468                 bt_rfkill_set_block(data, true);
 469 }
 470
 471 static const struct rfkill_ops toshiba_rfk_ops = {
 472         .set_block = bt_rfkill_set_block,
 473         .poll = bt_rfkill_poll,
 474 };
 475
 476 static int get_tr_backlight_status(struct toshiba_acpi_dev *dev, bool *enabled)
 477 {
 478         u32 hci_result;
 479         u32 status;
 480
 481         hci_read1(dev, HCI_TR_BACKLIGHT, &status, &hci_result);
 482         *enabled = !status;
 483         return hci_result == HCI_SUCCESS ? 0 : -EIO;
 484 }
 485
 486 static int set_tr_backlight_status(struct toshiba_acpi_dev *dev, bool enable)
 487 {
 488         u32 hci_result;
 489         u32 value = !enable;
 490
 491         hci_write1(dev, HCI_TR_BACKLIGHT, value, &hci_result);
 492         return hci_result == HCI_SUCCESS ? 0 : -EIO;
 493 }
 494
 495 static struct proc_dir_entry *toshiba_proc_dir /*= 0*/ ;
 496
 497 static int __get_lcd_brightness(struct toshiba_acpi_dev *dev)
 498 {
 499         u32 hci_result;
 500         u32 value;
 501         int brightness = 0;
 502
 503         if (dev->tr_backlight_supported) {
 504                 bool enabled;
 505                 int ret = get_tr_backlight_status(dev, &enabled);
 506                 if (ret)
 507                         return ret;
 508                 if (enabled)
 509                         return 0;
 510                 brightness++;
 511         }
 512
 513         hci_read1(dev, HCI_LCD_BRIGHTNESS, &value, &hci_result);
 514         if (hci_result == HCI_SUCCESS)
 515                 return brightness + (value >> HCI_LCD_BRIGHTNESS_SHIFT);
 516
 517         return -EIO;
 518 }
 519
 520 static int get_lcd_brightness(struct backlight_device *bd)
 521 {
 522         struct toshiba_acpi_dev *dev = bl_get_data(bd);
 523         return __get_lcd_brightness(dev);
 524 }
 525
 526 static int lcd_proc_show(struct seq_file *m, void *v)
 527 {
 528         struct toshiba_acpi_dev *dev = m->private;
 529         int value;
 530         int levels;
 531
 532         if (!dev->backlight_dev)
 533                 return -ENODEV;
 534
 535         levels = dev->backlight_dev->props.max_brightness + 1;
 536         value = get_lcd_brightness(dev->backlight_dev);
 537         if (value >= 0) {
 538                 seq_printf(m, "brightness:              %d\n", value);
 539                 seq_printf(m, "brightness_levels:       %d\n", levels);
 540                 return 0;
 541         }
 542
 543         pr_err("Error reading LCD brightness\n");
 544         return -EIO;
 545 }
 546
 547 static int lcd_proc_open(struct inode *inode, struct file *file)
 548 {
 549         return single_open(file, lcd_proc_show, PDE_DATA(inode));
 550 }
 551
 552 static int set_lcd_brightness(struct toshiba_acpi_dev *dev, int value)
 553 {
 554         u32 hci_result;
 555
 556         if (dev->tr_backlight_supported) {
 557                 bool enable = !value;
 558                 int ret = set_tr_backlight_status(dev, enable);
 559                 if (ret)
 560                         return ret;
 561                 if (value)
 562                         value--;
 563         }
 564
 565         value = value << HCI_LCD_BRIGHTNESS_SHIFT;
 566         hci_write1(dev, HCI_LCD_BRIGHTNESS, value, &hci_result);
 567         return hci_result == HCI_SUCCESS ? 0 : -EIO;
 568 }
 569
 570 static int set_lcd_status(struct backlight_device *bd)
 571 {
 572         struct toshiba_acpi_dev *dev = bl_get_data(bd);
 573         return set_lcd_brightness(dev, bd->props.brightness);
 574 }
 575
 576 static ssize_t lcd_proc_write(struct file *file, const char __user *buf,
 577                               size_t count, loff_t *pos)
 578 {
 579         struct toshiba_acpi_dev *dev = PDE_DATA(file_inode(file));
 580         char cmd[42];
 581         size_t len;
 582         int value;
 583         int ret;
 584         int levels = dev->backlight_dev->props.max_brightness + 1;
 585
 586         len = min(count, sizeof(cmd) - 1);
 587         if (copy_from_user(cmd, buf, len))
 588                 return -EFAULT;
 589         cmd[len] = '\0';
 590
 591         if (sscanf(cmd, " brightness : %i", &value) == 1 &&
 592             value >= 0 && value < levels) {
 593                 ret = set_lcd_brightness(dev, value);
 594                 if (ret == 0)
 595                         ret = count;
 596         } else {
 597                 ret = -EINVAL;
 598         }
 599         return ret;
 600 }
 601
 602 static const struct file_operations lcd_proc_fops = {
 603         .owner          = THIS_MODULE,
 604         .open           = lcd_proc_open,
 605         .read           = seq_read,
 606         .llseek         = seq_lseek,
 607         .release        = single_release,
 608         .write          = lcd_proc_write,
 609 };
 610
 611 static int get_video_status(struct toshiba_acpi_dev *dev, u32 *status)
 612 {
 613         u32 hci_result;
 614
 615         hci_read1(dev, HCI_VIDEO_OUT, status, &hci_result);
 616         return hci_result == HCI_SUCCESS ? 0 : -EIO;
 617 }
 618
 619 static int video_proc_show(struct seq_file *m, void *v)
 620 {
 621         struct toshiba_acpi_dev *dev = m->private;
 622         u32 value;
 623         int ret;
 624
 625         ret = get_video_status(dev, &value);
 626         if (!ret) {
 627                 int is_lcd = (value & HCI_VIDEO_OUT_LCD) ? 1 : 0;
 628                 int is_crt = (value & HCI_VIDEO_OUT_CRT) ? 1 : 0;
 629                 int is_tv = (value & HCI_VIDEO_OUT_TV) ? 1 : 0;
 630                 seq_printf(m, "lcd_out:                 %d\n", is_lcd);
 631                 seq_printf(m, "crt_out:                 %d\n", is_crt);
 632                 seq_printf(m, "tv_out:                  %d\n", is_tv);
 633         }
 634
 635         return ret;
 636 }
 637
 638 static int video_proc_open(struct inode *inode, struct file *file)
 639 {
 640         return single_open(file, video_proc_show, PDE_DATA(inode));
 641 }
 642
 643 static ssize_t video_proc_write(struct file *file, const char __user *buf,
 644                                 size_t count, loff_t *pos)
 645 {
 646         struct toshiba_acpi_dev *dev = PDE_DATA(file_inode(file));
 647         char *cmd, *buffer;
 648         int ret;
 649         int value;
 650         int remain = count;
 651         int lcd_out = -1;
 652         int crt_out = -1;
 653         int tv_out = -1;
 654         u32 video_out;
 655
 656         cmd = kmalloc(count + 1, GFP_KERNEL);
 657         if (!cmd)
 658                 return -ENOMEM;
 659         if (copy_from_user(cmd, buf, count)) {
 660                 kfree(cmd);
 661                 return -EFAULT;
 662         }
 663         cmd[count] = '\0';
 664
 665         buffer = cmd;
 666
 667         /* scan expression.  Multiple expressions may be delimited with ;
 668          *
 669          *  NOTE: to keep scanning simple, invalid fields are ignored
 670          */
 671         while (remain) {
 672                 if (sscanf(buffer, " lcd_out : %i", &value) == 1)
 673                         lcd_out = value & 1;
 674                 else if (sscanf(buffer, " crt_out : %i", &value) == 1)
 675                         crt_out = value & 1;
 676                 else if (sscanf(buffer, " tv_out : %i", &value) == 1)
 677                         tv_out = value & 1;
 678                 /* advance to one character past the next ; */
 679                 do {
 680                         ++buffer;
 681                         --remain;
 682                 }
 683                 while (remain && *(buffer - 1) != ';');
 684         }
 685
 686         kfree(cmd);
 687
 688         ret = get_video_status(dev, &video_out);
 689         if (!ret) {
 690                 unsigned int new_video_out = video_out;
 691                 if (lcd_out != -1)
 692                         _set_bit(&new_video_out, HCI_VIDEO_OUT_LCD, lcd_out);
 693                 if (crt_out != -1)
 694                         _set_bit(&new_video_out, HCI_VIDEO_OUT_CRT, crt_out);
 695                 if (tv_out != -1)
 696                         _set_bit(&new_video_out, HCI_VIDEO_OUT_TV, tv_out);
 697                 /* To avoid unnecessary video disruption, only write the new
 698                  * video setting if something changed. */
 699                 if (new_video_out != video_out)
 700                         ret = write_acpi_int(METHOD_VIDEO_OUT, new_video_out);
 701         }
 702
 703         return ret ? ret : count;
 704 }
 705
 706 static const struct file_operations video_proc_fops = {
 707         .owner          = THIS_MODULE,
 708         .open           = video_proc_open,
 709         .read           = seq_read,
 710         .llseek         = seq_lseek,
 711         .release        = single_release,
 712         .write          = video_proc_write,
 713 };
 714
 715 static int get_fan_status(struct toshiba_acpi_dev *dev, u32 *status)
 716 {
 717         u32 hci_result;
 718
 719         hci_read1(dev, HCI_FAN, status, &hci_result);
 720         return hci_result == HCI_SUCCESS ? 0 : -EIO;
 721 }
 722
 723 static int fan_proc_show(struct seq_file *m, void *v)
 724 {
 725         struct toshiba_acpi_dev *dev = m->private;
 726         int ret;
 727         u32 value;
 728
 729         ret = get_fan_status(dev, &value);
 730         if (!ret) {
 731                 seq_printf(m, "running:                 %d\n", (value > 0));
 732                 seq_printf(m, "force_on:                %d\n", dev->force_fan);
 733         }
 734
 735         return ret;
 736 }
 737
 738 static int fan_proc_open(struct inode *inode, struct file *file)
 739 {
 740         return single_open(file, fan_proc_show, PDE_DATA(inode));
 741 }
 742
 743 static ssize_t fan_proc_write(struct file *file, const char __user *buf,
 744                               size_t count, loff_t *pos)
 745 {
 746         struct toshiba_acpi_dev *dev = PDE_DATA(file_inode(file));
 747         char cmd[42];
 748         size_t len;
 749         int value;
 750         u32 hci_result;
 751
 752         len = min(count, sizeof(cmd) - 1);
 753         if (copy_from_user(cmd, buf, len))
 754                 return -EFAULT;
 755         cmd[len] = '\0';
 756
 757         if (sscanf(cmd, " force_on : %i", &value) == 1 &&
 758             value >= 0 && value <= 1) {
 759                 hci_write1(dev, HCI_FAN, value, &hci_result);
 760                 if (hci_result != HCI_SUCCESS)
 761                         return -EIO;
 762                 else
 763                         dev->force_fan = value;
 764         } else {
 765                 return -EINVAL;
 766         }
 767
 768         return count;
 769 }
 770
 771 static const struct file_operations fan_proc_fops = {
 772         .owner          = THIS_MODULE,
 773         .open           = fan_proc_open,
 774         .read           = seq_read,
 775         .llseek         = seq_lseek,
 776         .release        = single_release,
 777         .write          = fan_proc_write,
 778 };
 779
 780 static int keys_proc_show(struct seq_file *m, void *v)
 781 {
 782         struct toshiba_acpi_dev *dev = m->private;
 783         u32 hci_result;
 784         u32 value;
 785
 786         if (!dev->key_event_valid && dev->system_event_supported) {
 787                 hci_read1(dev, HCI_SYSTEM_EVENT, &value, &hci_result);
 788                 if (hci_result == HCI_SUCCESS) {
 789                         dev->key_event_valid = 1;
 790                         dev->last_key_event = value;
 791                 } else if (hci_result == HCI_EMPTY) {
 792                         /* better luck next time */
 793                 } else if (hci_result == HCI_NOT_SUPPORTED) {
 794                         /* This is a workaround for an unresolved issue on
 795                          * some machines where system events sporadically
 796                          * become disabled. */
 797                         hci_write1(dev, HCI_SYSTEM_EVENT, 1, &hci_result);
 798                         pr_notice("Re-enabled hotkeys\n");
 799                 } else {
 800                         pr_err("Error reading hotkey status\n");
 801                         return -EIO;
 802                 }
 803         }
 804
 805         seq_printf(m, "hotkey_ready:            %d\n", dev->key_event_valid);
 806         seq_printf(m, "hotkey:                  0x%04x\n", dev->last_key_event);
 807         return 0;
 808 }
 809
 810 static int keys_proc_open(struct inode *inode, struct file *file)
 811 {
 812         return single_open(file, keys_proc_show, PDE_DATA(inode));
 813 }
 814
 815 static ssize_t keys_proc_write(struct file *file, const char __user *buf,
 816                                size_t count, loff_t *pos)
 817 {
 818         struct toshiba_acpi_dev *dev = PDE_DATA(file_inode(file));
 819         char cmd[42];
 820         size_t len;
 821         int value;
 822
 823         len = min(count, sizeof(cmd) - 1);
 824         if (copy_from_user(cmd, buf, len))
 825                 return -EFAULT;
 826         cmd[len] = '\0';
 827
 828         if (sscanf(cmd, " hotkey_ready : %i", &value) == 1 && value == 0) {
 829                 dev->key_event_valid = 0;
 830         } else {
 831                 return -EINVAL;
 832         }
 833
 834         return count;
 835 }
 836
 837 static const struct file_operations keys_proc_fops = {
 838         .owner          = THIS_MODULE,
 839         .open           = keys_proc_open,
 840         .read           = seq_read,
 841         .llseek         = seq_lseek,
 842         .release        = single_release,
 843         .write          = keys_proc_write,
 844 };
 845
 846 static int version_proc_show(struct seq_file *m, void *v)
 847 {
 848         seq_printf(m, "driver:                  %s\n", TOSHIBA_ACPI_VERSION);
 849         seq_printf(m, "proc_interface:          %d\n", PROC_INTERFACE_VERSION);
 850         return 0;
 851 }
 852
 853 static int version_proc_open(struct inode *inode, struct file *file)
 854 {
 855         return single_open(file, version_proc_show, PDE_DATA(inode));
 856 }
 857
 858 static const struct file_operations version_proc_fops = {
 859         .owner          = THIS_MODULE,
 860         .open           = version_proc_open,
 861         .read           = seq_read,
 862         .llseek         = seq_lseek,
 863         .release        = single_release,
 864 };
 865
 866 /* proc and module init
 867  */
 868
 869 #define PROC_TOSHIBA            "toshiba"
 870
 871 static void create_toshiba_proc_entries(struct toshiba_acpi_dev *dev)
 872 {
 873         if (dev->backlight_dev)
 874                 proc_create_data("lcd", S_IRUGO | S_IWUSR, toshiba_proc_dir,
 875                                  &lcd_proc_fops, dev);
 876         if (dev->video_supported)
 877                 proc_create_data("video", S_IRUGO | S_IWUSR, toshiba_proc_dir,
 878                                  &video_proc_fops, dev);
 879         if (dev->fan_supported)
 880                 proc_create_data("fan", S_IRUGO | S_IWUSR, toshiba_proc_dir,
 881                                  &fan_proc_fops, dev);
 882         if (dev->hotkey_dev)
 883                 proc_create_data("keys", S_IRUGO | S_IWUSR, toshiba_proc_dir,
 884                                  &keys_proc_fops, dev);
 885         proc_create_data("version", S_IRUGO, toshiba_proc_dir,
 886                          &version_proc_fops, dev);
 887 }
 888
 889 static void remove_toshiba_proc_entries(struct toshiba_acpi_dev *dev)
 890 {
 891         if (dev->backlight_dev)
 892                 remove_proc_entry("lcd", toshiba_proc_dir);
 893         if (dev->video_supported)
 894                 remove_proc_entry("video", toshiba_proc_dir);
 895         if (dev->fan_supported)
 896                 remove_proc_entry("fan", toshiba_proc_dir);
 897         if (dev->hotkey_dev)
 898                 remove_proc_entry("keys", toshiba_proc_dir);
 899         remove_proc_entry("version", toshiba_proc_dir);
 900 }
 901
 902 static const struct backlight_ops toshiba_backlight_data = {
 903         .options = BL_CORE_SUSPENDRESUME,
 904         .get_brightness = get_lcd_brightness,
 905         .update_status  = set_lcd_status,
 906 };
 907
 908 static bool toshiba_acpi_i8042_filter(unsigned char data, unsigned char str,
 909                                       struct serio *port)
 910 {
 911         if (str & 0x20)
 912                 return false;
 913
 914         if (unlikely(data == 0xe0))
 915                 return false;
 916
 917         if ((data & 0x7f) == TOS1900_FN_SCAN) {
 918                 schedule_work(&toshiba_acpi->hotkey_work);
 919                 return true;
 920         }
 921
 922         return false;
 923 }
 924
 925 static void toshiba_acpi_hotkey_work(struct work_struct *work)
 926 {
 927         acpi_handle ec_handle = ec_get_handle();
 928         acpi_status status;
 929
 930         if (!ec_handle)
 931                 return;
 932
 933         status = acpi_evaluate_object(ec_handle, "NTFY", NULL, NULL);
 934         if (ACPI_FAILURE(status))
 935                 pr_err("ACPI NTFY method execution failed\n");
 936 }
 937
 938 /*
 939  * Returns hotkey scancode, or < 0 on failure.
 940  */
 941 static int toshiba_acpi_query_hotkey(struct toshiba_acpi_dev *dev)
 942 {
 943         unsigned long long value;
 944         acpi_status status;
 945
 946         status = acpi_evaluate_integer(dev->acpi_dev->handle, "INFO",
 947                                       NULL, &value);
 948         if (ACPI_FAILURE(status)) {
 949                 pr_err("ACPI INFO method execution failed\n");
 950                 return -EIO;
 951         }
 952
 953         return value;
 954 }
 955
 956 static void toshiba_acpi_report_hotkey(struct toshiba_acpi_dev *dev,
 957                                        int scancode)
 958 {
 959         if (scancode == 0x100)
 960                 return;
 961
 962         /* act on key press; ignore key release */
 963         if (scancode & 0x80)
 964                 return;
 965
 966         if (!sparse_keymap_report_event(dev->hotkey_dev, scancode, 1, true))
 967                 pr_info("Unknown key %x\n", scancode);
 968 }
 969
 970 static int toshiba_acpi_setup_keyboard(struct toshiba_acpi_dev *dev)
 971 {
 972         acpi_status status;
 973         acpi_handle ec_handle;
 974         int error;
 975         u32 hci_result;
 976
 977         dev->hotkey_dev = input_allocate_device();
 978         if (!dev->hotkey_dev)
 979                 return -ENOMEM;
 980
 981         dev->hotkey_dev->name = "Toshiba input device";
 982         dev->hotkey_dev->phys = "toshiba_acpi/input0";
 983         dev->hotkey_dev->id.bustype = BUS_HOST;
 984
 985         error = sparse_keymap_setup(dev->hotkey_dev, toshiba_acpi_keymap, NULL);
 986         if (error)
 987                 goto err_free_dev;
 988
 989         /*
 990          * For some machines the SCI responsible for providing hotkey
 991          * notification doesn't fire. We can trigger the notification
 992          * whenever the Fn key is pressed using the NTFY method, if
 993          * supported, so if it's present set up an i8042 key filter
 994          * for this purpose.
 995          */
 996         status = AE_ERROR;
 997         ec_handle = ec_get_handle();
 998         if (ec_handle && acpi_has_method(ec_handle, "NTFY")) {
 999                 INIT_WORK(&dev->hotkey_work, toshiba_acpi_hotkey_work);
1000
1001                 error = i8042_install_filter(toshiba_acpi_i8042_filter);
1002                 if (error) {
1003                         pr_err("Error installing key filter\n");
1004                         goto err_free_keymap;
1005                 }
1006
1007                 dev->ntfy_supported = 1;
1008         }
1009
1010         /*
1011          * Determine hotkey query interface. Prefer using the INFO
1012          * method when it is available.
1013          */
1014         if (acpi_has_method(dev->acpi_dev->handle, "INFO"))
1015                 dev->info_supported = 1;
1016         else {
1017                 hci_write1(dev, HCI_SYSTEM_EVENT, 1, &hci_result);
1018                 if (hci_result == HCI_SUCCESS)
1019                         dev->system_event_supported = 1;
1020         }
1021
1022         if (!dev->info_supported && !dev->system_event_supported) {
1023                 pr_warn("No hotkey query interface found\n");
1024                 goto err_remove_filter;
1025         }
1026
1027         status = acpi_evaluate_object(dev->acpi_dev->handle, "ENAB", NULL, NULL);
1028         if (ACPI_FAILURE(status)) {
1029                 pr_info("Unable to enable hotkeys\n");
1030                 error = -ENODEV;
1031                 goto err_remove_filter;
1032         }
1033
1034         error = input_register_device(dev->hotkey_dev);
1035         if (error) {
1036                 pr_info("Unable to register input device\n");
1037                 goto err_remove_filter;
1038         }
1039
1040         hci_write1(dev, HCI_HOTKEY_EVENT, HCI_HOTKEY_ENABLE, &hci_result);
1041         return 0;
1042
1043  err_remove_filter:
1044         if (dev->ntfy_supported)
1045                 i8042_remove_filter(toshiba_acpi_i8042_filter);
1046  err_free_keymap:
1047         sparse_keymap_free(dev->hotkey_dev);
1048  err_free_dev:
1049         input_free_device(dev->hotkey_dev);
1050         dev->hotkey_dev = NULL;
1051         return error;
1052 }
1053
1054 static int toshiba_acpi_setup_backlight(struct toshiba_acpi_dev *dev)
1055 {
1056         struct backlight_properties props;
1057         int brightness;
1058         int ret;
1059         bool enabled;
1060
1061         /*
1062          * Some machines don't support the backlight methods at all, and
1063          * others support it read-only. Either of these is pretty useless,
1064          * so only register the backlight device if the backlight method
1065          * supports both reads and writes.
1066          */
1067         brightness = __get_lcd_brightness(dev);
1068         if (brightness < 0)
1069                 return 0;
1070         ret = set_lcd_brightness(dev, brightness);
1071         if (ret) {
1072                 pr_debug("Backlight method is read-only, disabling backlight support\n");
1073                 return 0;
1074         }
1075
1076         /* Determine whether or not BIOS supports transflective backlight */
1077         ret = get_tr_backlight_status(dev, &enabled);
1078         dev->tr_backlight_supported = !ret;
1079
1080         memset(&props, 0, sizeof(props));
1081         props.type = BACKLIGHT_PLATFORM;
1082         props.max_brightness = HCI_LCD_BRIGHTNESS_LEVELS - 1;
1083
1084         /* adding an extra level and having 0 change to transflective mode */
1085         if (dev->tr_backlight_supported)
1086                 props.max_brightness++;
1087
1088         dev->backlight_dev = backlight_device_register("toshiba",
1089                                                        &dev->acpi_dev->dev,
1090                                                        dev,
1091                                                        &toshiba_backlight_data,
1092                                                        &props);
1093         if (IS_ERR(dev->backlight_dev)) {
1094                 ret = PTR_ERR(dev->backlight_dev);
1095                 pr_err("Could not register toshiba backlight device\n");
1096                 dev->backlight_dev = NULL;
1097                 return ret;
1098         }
1099
1100         dev->backlight_dev->props.brightness = brightness;
1101         return 0;
1102 }
1103
1104 static int toshiba_acpi_remove(struct acpi_device *acpi_dev)
1105 {
1106         struct toshiba_acpi_dev *dev = acpi_driver_data(acpi_dev);
1107
1108         remove_toshiba_proc_entries(dev);
1109
1110         if (dev->ntfy_supported) {
1111                 i8042_remove_filter(toshiba_acpi_i8042_filter);
1112                 cancel_work_sync(&dev->hotkey_work);
1113         }
1114
1115         if (dev->hotkey_dev) {
1116                 input_unregister_device(dev->hotkey_dev);
1117                 sparse_keymap_free(dev->hotkey_dev);
1118         }
1119
1120         if (dev->bt_rfk) {
1121                 rfkill_unregister(dev->bt_rfk);
1122                 rfkill_destroy(dev->bt_rfk);
1123         }
1124
1125         if (dev->backlight_dev)
1126                 backlight_device_unregister(dev->backlight_dev);
1127
1128         if (dev->illumination_supported)
1129                 led_classdev_unregister(&dev->led_dev);
1130
1131         if (toshiba_acpi)
1132                 toshiba_acpi = NULL;
1133
1134         kfree(dev);
1135
1136         return 0;
1137 }
1138
1139 static const char *find_hci_method(acpi_handle handle)
1140 {
1141         if (acpi_has_method(handle, "GHCI"))
1142                 return "GHCI";
1143
1144         if (acpi_has_method(handle, "SPFC"))
1145                 return "SPFC";
1146
1147         return NULL;
1148 }
1149
1150 static int toshiba_acpi_add(struct acpi_device *acpi_dev)
1151 {
1152         struct toshiba_acpi_dev *dev;
1153         const char *hci_method;
1154         u32 dummy;
1155         bool bt_present;
1156         int ret = 0;
1157
1158         if (toshiba_acpi)
1159                 return -EBUSY;
1160
1161         pr_info("Toshiba Laptop ACPI Extras version %s\n",
1162                TOSHIBA_ACPI_VERSION);
1163
1164         hci_method = find_hci_method(acpi_dev->handle);
1165         if (!hci_method) {
1166                 pr_err("HCI interface not found\n");
1167                 return -ENODEV;
1168         }
1169
1170         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1171         if (!dev)
1172                 return -ENOMEM;
1173         dev->acpi_dev = acpi_dev;
1174         dev->method_hci = hci_method;
1175         acpi_dev->driver_data = dev;
1176
1177         if (toshiba_acpi_setup_keyboard(dev))
1178                 pr_info("Unable to activate hotkeys\n");
1179
1180         mutex_init(&dev->mutex);
1181
1182         ret = toshiba_acpi_setup_backlight(dev);
1183         if (ret)
1184                 goto error;
1185
1186         /* Register rfkill switch for Bluetooth */
1187         if (hci_get_bt_present(dev, &bt_present) == HCI_SUCCESS && bt_present) {
1188                 dev->bt_rfk = rfkill_alloc("Toshiba Bluetooth",
1189                                            &acpi_dev->dev,
1190                                            RFKILL_TYPE_BLUETOOTH,
1191                                            &toshiba_rfk_ops,
1192                                            dev);
1193                 if (!dev->bt_rfk) {
1194                         pr_err("unable to allocate rfkill device\n");
1195                         ret = -ENOMEM;
1196                         goto error;
1197                 }
1198
1199                 ret = rfkill_register(dev->bt_rfk);
1200                 if (ret) {
1201                         pr_err("unable to register rfkill device\n");
1202                         rfkill_destroy(dev->bt_rfk);
1203                         goto error;
1204                 }
1205         }
1206
1207         if (toshiba_illumination_available(dev)) {
1208                 dev->led_dev.name = "toshiba::illumination";
1209                 dev->led_dev.max_brightness = 1;
1210                 dev->led_dev.brightness_set = toshiba_illumination_set;
1211                 dev->led_dev.brightness_get = toshiba_illumination_get;
1212                 if (!led_classdev_register(&acpi_dev->dev, &dev->led_dev))
1213                         dev->illumination_supported = 1;
1214         }
1215
1216         /* Determine whether or not BIOS supports fan and video interfaces */
1217
1218         ret = get_video_status(dev, &dummy);
1219         dev->video_supported = !ret;
1220
1221         ret = get_fan_status(dev, &dummy);
1222         dev->fan_supported = !ret;
1223
1224         create_toshiba_proc_entries(dev);
1225
1226         toshiba_acpi = dev;
1227
1228         return 0;
1229
1230 error:
1231         toshiba_acpi_remove(acpi_dev);
1232         return ret;
1233 }
1234
1235 static void toshiba_acpi_notify(struct acpi_device *acpi_dev, u32 event)
1236 {
1237         struct toshiba_acpi_dev *dev = acpi_driver_data(acpi_dev);
1238         u32 hci_result, value;
1239         int retries = 3;
1240         int scancode;
1241
1242         if (event != 0x80)
1243                 return;
1244
1245         if (dev->info_supported) {
1246                 scancode = toshiba_acpi_query_hotkey(dev);
1247                 if (scancode < 0)
1248                         pr_err("Failed to query hotkey event\n");
1249                 else if (scancode != 0)
1250                         toshiba_acpi_report_hotkey(dev, scancode);
1251         } else if (dev->system_event_supported) {
1252                 do {
1253                         hci_read1(dev, HCI_SYSTEM_EVENT, &value, &hci_result);
1254                         switch (hci_result) {
1255                         case HCI_SUCCESS:
1256                                 toshiba_acpi_report_hotkey(dev, (int)value);
1257                                 break;
1258                         case HCI_NOT_SUPPORTED:
1259                                 /*
1260                                  * This is a workaround for an unresolved
1261                                  * issue on some machines where system events
1262                                  * sporadically become disabled.
1263                                  */
1264                                 hci_write1(dev, HCI_SYSTEM_EVENT, 1,
1265                                            &hci_result);
1266                                 pr_notice("Re-enabled hotkeys\n");
1267                                 /* fall through */
1268                         default:
1269                                 retries--;
1270                                 break;
1271                         }
1272                 } while (retries && hci_result != HCI_EMPTY);
1273         }
1274 }
1275
1276 #ifdef CONFIG_PM_SLEEP
1277 static int toshiba_acpi_suspend(struct device *device)
1278 {
1279         struct toshiba_acpi_dev *dev = acpi_driver_data(to_acpi_device(device));
1280         u32 result;
1281
1282         if (dev->hotkey_dev)
1283                 hci_write1(dev, HCI_HOTKEY_EVENT, HCI_HOTKEY_DISABLE, &result);
1284
1285         return 0;
1286 }
1287
1288 static int toshiba_acpi_resume(struct device *device)
1289 {
1290         struct toshiba_acpi_dev *dev = acpi_driver_data(to_acpi_device(device));
1291         u32 result;
1292
1293         if (dev->hotkey_dev)
1294                 hci_write1(dev, HCI_HOTKEY_EVENT, HCI_HOTKEY_ENABLE, &result);
1295
1296         return 0;
1297 }
1298 #endif
1299
1300 static SIMPLE_DEV_PM_OPS(toshiba_acpi_pm,
1301                          toshiba_acpi_suspend, toshiba_acpi_resume);
1302
1303 static struct acpi_driver toshiba_acpi_driver = {
1304         .name   = "Toshiba ACPI driver",
1305         .owner  = THIS_MODULE,
1306         .ids    = toshiba_device_ids,
1307         .flags  = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1308         .ops    = {
1309                 .add            = toshiba_acpi_add,
1310                 .remove         = toshiba_acpi_remove,
1311                 .notify         = toshiba_acpi_notify,
1312         },
1313         .drv.pm = &toshiba_acpi_pm,
1314 };
1315
1316 static int __init toshiba_acpi_init(void)
1317 {
1318         int ret;
1319
1320         /*
1321          * Machines with this WMI guid aren't supported due to bugs in
1322          * their AML. This check relies on wmi initializing before
1323          * toshiba_acpi to guarantee guids have been identified.
1324          */
1325         if (wmi_has_guid(TOSHIBA_WMI_EVENT_GUID))
1326                 return -ENODEV;
1327
1328         toshiba_proc_dir = proc_mkdir(PROC_TOSHIBA, acpi_root_dir);
1329         if (!toshiba_proc_dir) {
1330                 pr_err("Unable to create proc dir " PROC_TOSHIBA "\n");
1331                 return -ENODEV;
1332         }
1333
1334         ret = acpi_bus_register_driver(&toshiba_acpi_driver);
1335         if (ret) {
1336                 pr_err("Failed to register ACPI driver: %d\n", ret);
1337                 remove_proc_entry(PROC_TOSHIBA, acpi_root_dir);
1338         }
1339
1340         return ret;
1341 }
1342
1343 static void __exit toshiba_acpi_exit(void)
1344 {
1345         acpi_bus_unregister_driver(&toshiba_acpi_driver);
1346         if (toshiba_proc_dir)
1347                 remove_proc_entry(PROC_TOSHIBA, acpi_root_dir);
1348 }
1349
1350 module_init(toshiba_acpi_init);
1351 module_exit(toshiba_acpi_exit);