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