drivers/platform/x86/dell-laptop.c

   1 /*
   2  *  Driver for Dell laptop extras
   3  *
   4  *  Copyright (c) Red Hat <mjg@redhat.com>
   5  *  Copyright (c) 2014 Gabriele Mazzotta <gabriele.mzt@gmail.com>
   6  *  Copyright (c) 2014 Pali Rohár <pali.rohar@gmail.com>
   7  *
   8  *  Based on documentation in the libsmbios package:
   9  *  Copyright (C) 2005-2014 Dell Inc.
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License version 2 as
  13  *  published by the Free Software Foundation.
  14  */
  15
  16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  17
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/backlight.h>
  23 #include <linux/err.h>
  24 #include <linux/dmi.h>
  25 #include <linux/io.h>
  26 #include <linux/rfkill.h>
  27 #include <linux/power_supply.h>
  28 #include <linux/acpi.h>
  29 #include <linux/mm.h>
  30 #include <linux/i8042.h>
  31 #include <linux/debugfs.h>
  32 #include <linux/seq_file.h>
  33 #include <acpi/video.h>
  34 #include "dell-rbtn.h"
  35 #include "dell-smbios.h"
  36
  37 #define BRIGHTNESS_TOKEN 0x7d
  38 #define KBD_LED_OFF_TOKEN 0x01E1
  39 #define KBD_LED_ON_TOKEN 0x01E2
  40 #define KBD_LED_AUTO_TOKEN 0x01E3
  41 #define KBD_LED_AUTO_25_TOKEN 0x02EA
  42 #define KBD_LED_AUTO_50_TOKEN 0x02EB
  43 #define KBD_LED_AUTO_75_TOKEN 0x02EC
  44 #define KBD_LED_AUTO_100_TOKEN 0x02F6
  45
  46 struct quirk_entry {
  47         u8 touchpad_led;
  48
  49         int needs_kbd_timeouts;
  50         /*
  51          * Ordered list of timeouts expressed in seconds.
  52          * The list must end with -1
  53          */
  54         int kbd_timeouts[];
  55 };
  56
  57 static struct quirk_entry *quirks;
  58
  59 static struct quirk_entry quirk_dell_vostro_v130 = {
  60         .touchpad_led = 1,
  61 };
  62
  63 static int __init dmi_matched(const struct dmi_system_id *dmi)
  64 {
  65         quirks = dmi->driver_data;
  66         return 1;
  67 }
  68
  69 /*
  70  * These values come from Windows utility provided by Dell. If any other value
  71  * is used then BIOS silently set timeout to 0 without any error message.
  72  */
  73 static struct quirk_entry quirk_dell_xps13_9333 = {
  74         .needs_kbd_timeouts = 1,
  75         .kbd_timeouts = { 0, 5, 15, 60, 5 * 60, 15 * 60, -1 },
  76 };
  77
  78 static struct platform_driver platform_driver = {
  79         .driver = {
  80                 .name = "dell-laptop",
  81         }
  82 };
  83
  84 static struct platform_device *platform_device;
  85 static struct backlight_device *dell_backlight_device;
  86 static struct rfkill *wifi_rfkill;
  87 static struct rfkill *bluetooth_rfkill;
  88 static struct rfkill *wwan_rfkill;
  89 static bool force_rfkill;
  90
  91 module_param(force_rfkill, bool, 0444);
  92 MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
  93
  94 static const struct dmi_system_id dell_device_table[] __initconst = {
  95         {
  96                 .ident = "Dell laptop",
  97                 .matches = {
  98                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
  99                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 100                 },
 101         },
 102         {
 103                 .matches = {
 104                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 105                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
 106                 },
 107         },
 108         {
 109                 .ident = "Dell Computer Corporation",
 110                 .matches = {
 111                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 112                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 113                 },
 114         },
 115         { }
 116 };
 117 MODULE_DEVICE_TABLE(dmi, dell_device_table);
 118
 119 static const struct dmi_system_id dell_quirks[] __initconst = {
 120         {
 121                 .callback = dmi_matched,
 122                 .ident = "Dell Vostro V130",
 123                 .matches = {
 124                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 125                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
 126                 },
 127                 .driver_data = &quirk_dell_vostro_v130,
 128         },
 129         {
 130                 .callback = dmi_matched,
 131                 .ident = "Dell Vostro V131",
 132                 .matches = {
 133                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 134                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 135                 },
 136                 .driver_data = &quirk_dell_vostro_v130,
 137         },
 138         {
 139                 .callback = dmi_matched,
 140                 .ident = "Dell Vostro 3350",
 141                 .matches = {
 142                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 143                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
 144                 },
 145                 .driver_data = &quirk_dell_vostro_v130,
 146         },
 147         {
 148                 .callback = dmi_matched,
 149                 .ident = "Dell Vostro 3555",
 150                 .matches = {
 151                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 152                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
 153                 },
 154                 .driver_data = &quirk_dell_vostro_v130,
 155         },
 156         {
 157                 .callback = dmi_matched,
 158                 .ident = "Dell Inspiron N311z",
 159                 .matches = {
 160                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 161                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
 162                 },
 163                 .driver_data = &quirk_dell_vostro_v130,
 164         },
 165         {
 166                 .callback = dmi_matched,
 167                 .ident = "Dell Inspiron M5110",
 168                 .matches = {
 169                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 170                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
 171                 },
 172                 .driver_data = &quirk_dell_vostro_v130,
 173         },
 174         {
 175                 .callback = dmi_matched,
 176                 .ident = "Dell Vostro 3360",
 177                 .matches = {
 178                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 179                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
 180                 },
 181                 .driver_data = &quirk_dell_vostro_v130,
 182         },
 183         {
 184                 .callback = dmi_matched,
 185                 .ident = "Dell Vostro 3460",
 186                 .matches = {
 187                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 188                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"),
 189                 },
 190                 .driver_data = &quirk_dell_vostro_v130,
 191         },
 192         {
 193                 .callback = dmi_matched,
 194                 .ident = "Dell Vostro 3560",
 195                 .matches = {
 196                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 197                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"),
 198                 },
 199                 .driver_data = &quirk_dell_vostro_v130,
 200         },
 201         {
 202                 .callback = dmi_matched,
 203                 .ident = "Dell Vostro 3450",
 204                 .matches = {
 205                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 206                         DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"),
 207                 },
 208                 .driver_data = &quirk_dell_vostro_v130,
 209         },
 210         {
 211                 .callback = dmi_matched,
 212                 .ident = "Dell Inspiron 5420",
 213                 .matches = {
 214                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 215                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"),
 216                 },
 217                 .driver_data = &quirk_dell_vostro_v130,
 218         },
 219         {
 220                 .callback = dmi_matched,
 221                 .ident = "Dell Inspiron 5520",
 222                 .matches = {
 223                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 224                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"),
 225                 },
 226                 .driver_data = &quirk_dell_vostro_v130,
 227         },
 228         {
 229                 .callback = dmi_matched,
 230                 .ident = "Dell Inspiron 5720",
 231                 .matches = {
 232                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 233                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"),
 234                 },
 235                 .driver_data = &quirk_dell_vostro_v130,
 236         },
 237         {
 238                 .callback = dmi_matched,
 239                 .ident = "Dell Inspiron 7420",
 240                 .matches = {
 241                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 242                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"),
 243                 },
 244                 .driver_data = &quirk_dell_vostro_v130,
 245         },
 246         {
 247                 .callback = dmi_matched,
 248                 .ident = "Dell Inspiron 7520",
 249                 .matches = {
 250                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 251                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
 252                 },
 253                 .driver_data = &quirk_dell_vostro_v130,
 254         },
 255         {
 256                 .callback = dmi_matched,
 257                 .ident = "Dell Inspiron 7720",
 258                 .matches = {
 259                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 260                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
 261                 },
 262                 .driver_data = &quirk_dell_vostro_v130,
 263         },
 264         {
 265                 .callback = dmi_matched,
 266                 .ident = "Dell XPS13 9333",
 267                 .matches = {
 268                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 269                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
 270                 },
 271                 .driver_data = &quirk_dell_xps13_9333,
 272         },
 273         { }
 274 };
 275
 276 static inline int dell_smi_error(int value)
 277 {
 278         switch (value) {
 279         case 0: /* Completed successfully */
 280                 return 0;
 281         case -1: /* Completed with error */
 282                 return -EIO;
 283         case -2: /* Function not supported */
 284                 return -ENXIO;
 285         default: /* Unknown error */
 286                 return -EINVAL;
 287         }
 288 }
 289
 290 /*
 291  * Derived from information in smbios-wireless-ctl:
 292  *
 293  * cbSelect 17, Value 11
 294  *
 295  * Return Wireless Info
 296  * cbArg1, byte0 = 0x00
 297  *
 298  *     cbRes1 Standard return codes (0, -1, -2)
 299  *     cbRes2 Info bit flags:
 300  *
 301  *     0 Hardware switch supported (1)
 302  *     1 WiFi locator supported (1)
 303  *     2 WLAN supported (1)
 304  *     3 Bluetooth (BT) supported (1)
 305  *     4 WWAN supported (1)
 306  *     5 Wireless KBD supported (1)
 307  *     6 Uw b supported (1)
 308  *     7 WiGig supported (1)
 309  *     8 WLAN installed (1)
 310  *     9 BT installed (1)
 311  *     10 WWAN installed (1)
 312  *     11 Uw b installed (1)
 313  *     12 WiGig installed (1)
 314  *     13-15 Reserved (0)
 315  *     16 Hardware (HW) switch is On (1)
 316  *     17 WLAN disabled (1)
 317  *     18 BT disabled (1)
 318  *     19 WWAN disabled (1)
 319  *     20 Uw b disabled (1)
 320  *     21 WiGig disabled (1)
 321  *     20-31 Reserved (0)
 322  *
 323  *     cbRes3 NVRAM size in bytes
 324  *     cbRes4, byte 0 NVRAM format version number
 325  *
 326  *
 327  * Set QuickSet Radio Disable Flag
 328  *     cbArg1, byte0 = 0x01
 329  *     cbArg1, byte1
 330  *     Radio ID     value:
 331  *     0        Radio Status
 332  *     1        WLAN ID
 333  *     2        BT ID
 334  *     3        WWAN ID
 335  *     4        UWB ID
 336  *     5        WIGIG ID
 337  *     cbArg1, byte2    Flag bits:
 338  *             0 QuickSet disables radio (1)
 339  *             1-7 Reserved (0)
 340  *
 341  *     cbRes1    Standard return codes (0, -1, -2)
 342  *     cbRes2    QuickSet (QS) radio disable bit map:
 343  *     0 QS disables WLAN
 344  *     1 QS disables BT
 345  *     2 QS disables WWAN
 346  *     3 QS disables UWB
 347  *     4 QS disables WIGIG
 348  *     5-31 Reserved (0)
 349  *
 350  * Wireless Switch Configuration
 351  *     cbArg1, byte0 = 0x02
 352  *
 353  *     cbArg1, byte1
 354  *     Subcommand:
 355  *     0 Get config
 356  *     1 Set config
 357  *     2 Set WiFi locator enable/disable
 358  *     cbArg1,byte2
 359  *     Switch settings (if byte 1==1):
 360  *     0 WLAN sw itch control (1)
 361  *     1 BT sw itch control (1)
 362  *     2 WWAN sw itch control (1)
 363  *     3 UWB sw itch control (1)
 364  *     4 WiGig sw itch control (1)
 365  *     5-7 Reserved (0)
 366  *    cbArg1, byte2 Enable bits (if byte 1==2):
 367  *     0 Enable WiFi locator (1)
 368  *
 369  *    cbRes1     Standard return codes (0, -1, -2)
 370  *    cbRes2 QuickSet radio disable bit map:
 371  *     0 WLAN controlled by sw itch (1)
 372  *     1 BT controlled by sw itch (1)
 373  *     2 WWAN controlled by sw itch (1)
 374  *     3 UWB controlled by sw itch (1)
 375  *     4 WiGig controlled by sw itch (1)
 376  *     5-6 Reserved (0)
 377  *     7 Wireless sw itch config locked (1)
 378  *     8 WiFi locator enabled (1)
 379  *     9-14 Reserved (0)
 380  *     15 WiFi locator setting locked (1)
 381  *     16-31 Reserved (0)
 382  *
 383  * Read Local Config Data (LCD)
 384  *     cbArg1, byte0 = 0x10
 385  *     cbArg1, byte1 NVRAM index low byte
 386  *     cbArg1, byte2 NVRAM index high byte
 387  *     cbRes1 Standard return codes (0, -1, -2)
 388  *     cbRes2 4 bytes read from LCD[index]
 389  *     cbRes3 4 bytes read from LCD[index+4]
 390  *     cbRes4 4 bytes read from LCD[index+8]
 391  *
 392  * Write Local Config Data (LCD)
 393  *     cbArg1, byte0 = 0x11
 394  *     cbArg1, byte1 NVRAM index low byte
 395  *     cbArg1, byte2 NVRAM index high byte
 396  *     cbArg2 4 bytes to w rite at LCD[index]
 397  *     cbArg3 4 bytes to w rite at LCD[index+4]
 398  *     cbArg4 4 bytes to w rite at LCD[index+8]
 399  *     cbRes1 Standard return codes (0, -1, -2)
 400  *
 401  * Populate Local Config Data from NVRAM
 402  *     cbArg1, byte0 = 0x12
 403  *     cbRes1 Standard return codes (0, -1, -2)
 404  *
 405  * Commit Local Config Data to NVRAM
 406  *     cbArg1, byte0 = 0x13
 407  *     cbRes1 Standard return codes (0, -1, -2)
 408  */
 409
 410 static int dell_rfkill_set(void *data, bool blocked)
 411 {
 412         int disable = blocked ? 1 : 0;
 413         unsigned long radio = (unsigned long)data;
 414         int hwswitch_bit = (unsigned long)data - 1;
 415         int hwswitch;
 416         int status;
 417         int ret;
 418
 419         dell_smbios_get_buffer();
 420
 421         dell_send_request(buffer, 17, 11);
 422         ret = buffer->output[0];
 423         status = buffer->output[1];
 424
 425         if (ret != 0)
 426                 goto out;
 427
 428         dell_smbios_clear_buffer();
 429
 430         buffer->input[0] = 0x2;
 431         dell_send_request(buffer, 17, 11);
 432         ret = buffer->output[0];
 433         hwswitch = buffer->output[1];
 434
 435         /* If the hardware switch controls this radio, and the hardware
 436            switch is disabled, always disable the radio */
 437         if (ret == 0 && (hwswitch & BIT(hwswitch_bit)) &&
 438             (status & BIT(0)) && !(status & BIT(16)))
 439                 disable = 1;
 440
 441         dell_smbios_clear_buffer();
 442
 443         buffer->input[0] = (1 | (radio<<8) | (disable << 16));
 444         dell_send_request(buffer, 17, 11);
 445         ret = buffer->output[0];
 446
 447  out:
 448         dell_smbios_release_buffer();
 449         return dell_smi_error(ret);
 450 }
 451
 452 /* Must be called with the buffer held */
 453 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
 454                                         int status)
 455 {
 456         if (status & BIT(0)) {
 457                 /* Has hw-switch, sync sw_state to BIOS */
 458                 int block = rfkill_blocked(rfkill);
 459                 dell_smbios_clear_buffer();
 460                 buffer->input[0] = (1 | (radio << 8) | (block << 16));
 461                 dell_send_request(buffer, 17, 11);
 462         } else {
 463                 /* No hw-switch, sync BIOS state to sw_state */
 464                 rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
 465         }
 466 }
 467
 468 static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
 469                                         int status, int hwswitch)
 470 {
 471         if (hwswitch & (BIT(radio - 1)))
 472                 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
 473 }
 474
 475 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 476 {
 477         int radio = ((unsigned long)data & 0xF);
 478         int hwswitch;
 479         int status;
 480         int ret;
 481
 482         dell_smbios_get_buffer();
 483
 484         dell_send_request(buffer, 17, 11);
 485         ret = buffer->output[0];
 486         status = buffer->output[1];
 487
 488         if (ret != 0 || !(status & BIT(0))) {
 489                 dell_smbios_release_buffer();
 490                 return;
 491         }
 492
 493         dell_smbios_clear_buffer();
 494
 495         buffer->input[0] = 0x2;
 496         dell_send_request(buffer, 17, 11);
 497         ret = buffer->output[0];
 498         hwswitch = buffer->output[1];
 499
 500         dell_smbios_release_buffer();
 501
 502         if (ret != 0)
 503                 return;
 504
 505         dell_rfkill_update_hw_state(rfkill, radio, status, hwswitch);
 506 }
 507
 508 static const struct rfkill_ops dell_rfkill_ops = {
 509         .set_block = dell_rfkill_set,
 510         .query = dell_rfkill_query,
 511 };
 512
 513 static struct dentry *dell_laptop_dir;
 514
 515 static int dell_debugfs_show(struct seq_file *s, void *data)
 516 {
 517         int hwswitch_state;
 518         int hwswitch_ret;
 519         int status;
 520         int ret;
 521
 522         dell_smbios_get_buffer();
 523
 524         dell_send_request(buffer, 17, 11);
 525         ret = buffer->output[0];
 526         status = buffer->output[1];
 527
 528         dell_smbios_clear_buffer();
 529
 530         buffer->input[0] = 0x2;
 531         dell_send_request(buffer, 17, 11);
 532         hwswitch_ret = buffer->output[0];
 533         hwswitch_state = buffer->output[1];
 534
 535         dell_smbios_release_buffer();
 536
 537         seq_printf(s, "return:\t%d\n", ret);
 538         seq_printf(s, "status:\t0x%X\n", status);
 539         seq_printf(s, "Bit 0 : Hardware switch supported:   %lu\n",
 540                    status & BIT(0));
 541         seq_printf(s, "Bit 1 : Wifi locator supported:      %lu\n",
 542                   (status & BIT(1)) >> 1);
 543         seq_printf(s, "Bit 2 : Wifi is supported:           %lu\n",
 544                   (status & BIT(2)) >> 2);
 545         seq_printf(s, "Bit 3 : Bluetooth is supported:      %lu\n",
 546                   (status & BIT(3)) >> 3);
 547         seq_printf(s, "Bit 4 : WWAN is supported:           %lu\n",
 548                   (status & BIT(4)) >> 4);
 549         seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
 550                   (status & BIT(5)) >> 5);
 551         seq_printf(s, "Bit 6 : UWB supported:               %lu\n",
 552                   (status & BIT(6)) >> 6);
 553         seq_printf(s, "Bit 7 : WiGig supported:             %lu\n",
 554                   (status & BIT(7)) >> 7);
 555         seq_printf(s, "Bit 8 : Wifi is installed:           %lu\n",
 556                   (status & BIT(8)) >> 8);
 557         seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
 558                   (status & BIT(9)) >> 9);
 559         seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
 560                   (status & BIT(10)) >> 10);
 561         seq_printf(s, "Bit 11: UWB installed:               %lu\n",
 562                   (status & BIT(11)) >> 11);
 563         seq_printf(s, "Bit 12: WiGig installed:             %lu\n",
 564                   (status & BIT(12)) >> 12);
 565
 566         seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
 567                   (status & BIT(16)) >> 16);
 568         seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
 569                   (status & BIT(17)) >> 17);
 570         seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
 571                   (status & BIT(18)) >> 18);
 572         seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
 573                   (status & BIT(19)) >> 19);
 574         seq_printf(s, "Bit 20: UWB is blocked:              %lu\n",
 575                   (status & BIT(20)) >> 20);
 576         seq_printf(s, "Bit 21: WiGig is blocked:            %lu\n",
 577                   (status & BIT(21)) >> 21);
 578
 579         seq_printf(s, "\nhwswitch_return:\t%d\n", hwswitch_ret);
 580         seq_printf(s, "hwswitch_state:\t0x%X\n", hwswitch_state);
 581         seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
 582                    hwswitch_state & BIT(0));
 583         seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
 584                    (hwswitch_state & BIT(1)) >> 1);
 585         seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
 586                    (hwswitch_state & BIT(2)) >> 2);
 587         seq_printf(s, "Bit 3 : UWB controlled by switch:       %lu\n",
 588                    (hwswitch_state & BIT(3)) >> 3);
 589         seq_printf(s, "Bit 4 : WiGig controlled by switch:     %lu\n",
 590                    (hwswitch_state & BIT(4)) >> 4);
 591         seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
 592                    (hwswitch_state & BIT(7)) >> 7);
 593         seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
 594                    (hwswitch_state & BIT(8)) >> 8);
 595         seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
 596                    (hwswitch_state & BIT(15)) >> 15);
 597
 598         return 0;
 599 }
 600
 601 static int dell_debugfs_open(struct inode *inode, struct file *file)
 602 {
 603         return single_open(file, dell_debugfs_show, inode->i_private);
 604 }
 605
 606 static const struct file_operations dell_debugfs_fops = {
 607         .owner = THIS_MODULE,
 608         .open = dell_debugfs_open,
 609         .read = seq_read,
 610         .llseek = seq_lseek,
 611         .release = single_release,
 612 };
 613
 614 static void dell_update_rfkill(struct work_struct *ignored)
 615 {
 616         int hwswitch = 0;
 617         int status;
 618         int ret;
 619
 620         dell_smbios_get_buffer();
 621
 622         dell_send_request(buffer, 17, 11);
 623         ret = buffer->output[0];
 624         status = buffer->output[1];
 625
 626         if (ret != 0)
 627                 goto out;
 628
 629         dell_smbios_clear_buffer();
 630
 631         buffer->input[0] = 0x2;
 632         dell_send_request(buffer, 17, 11);
 633         ret = buffer->output[0];
 634
 635         if (ret == 0 && (status & BIT(0)))
 636                 hwswitch = buffer->output[1];
 637
 638         if (wifi_rfkill) {
 639                 dell_rfkill_update_hw_state(wifi_rfkill, 1, status, hwswitch);
 640                 dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
 641         }
 642         if (bluetooth_rfkill) {
 643                 dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status,
 644                                             hwswitch);
 645                 dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
 646         }
 647         if (wwan_rfkill) {
 648                 dell_rfkill_update_hw_state(wwan_rfkill, 3, status, hwswitch);
 649                 dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
 650         }
 651
 652  out:
 653         dell_smbios_release_buffer();
 654 }
 655 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
 656
 657 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
 658                               struct serio *port)
 659 {
 660         static bool extended;
 661
 662         if (str & I8042_STR_AUXDATA)
 663                 return false;
 664
 665         if (unlikely(data == 0xe0)) {
 666                 extended = true;
 667                 return false;
 668         } else if (unlikely(extended)) {
 669                 switch (data) {
 670                 case 0x8:
 671                         schedule_delayed_work(&dell_rfkill_work,
 672                                               round_jiffies_relative(HZ / 4));
 673                         break;
 674                 }
 675                 extended = false;
 676         }
 677
 678         return false;
 679 }
 680
 681 static int (*dell_rbtn_notifier_register_func)(struct notifier_block *);
 682 static int (*dell_rbtn_notifier_unregister_func)(struct notifier_block *);
 683
 684 static int dell_laptop_rbtn_notifier_call(struct notifier_block *nb,
 685                                           unsigned long action, void *data)
 686 {
 687         schedule_delayed_work(&dell_rfkill_work, 0);
 688         return NOTIFY_OK;
 689 }
 690
 691 static struct notifier_block dell_laptop_rbtn_notifier = {
 692         .notifier_call = dell_laptop_rbtn_notifier_call,
 693 };
 694
 695 static int __init dell_setup_rfkill(void)
 696 {
 697         int status, ret, whitelisted;
 698         const char *product;
 699
 700         /*
 701          * rfkill support causes trouble on various models, mostly Inspirons.
 702          * So we whitelist certain series, and don't support rfkill on others.
 703          */
 704         whitelisted = 0;
 705         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 706         if (product &&  (strncmp(product, "Latitude", 8) == 0 ||
 707                          strncmp(product, "Precision", 9) == 0))
 708                 whitelisted = 1;
 709         if (!force_rfkill && !whitelisted)
 710                 return 0;
 711
 712         dell_smbios_get_buffer();
 713         dell_send_request(buffer, 17, 11);
 714         ret = buffer->output[0];
 715         status = buffer->output[1];
 716         dell_smbios_release_buffer();
 717
 718         /* dell wireless info smbios call is not supported */
 719         if (ret != 0)
 720                 return 0;
 721
 722         /* rfkill is only tested on laptops with a hwswitch */
 723         if (!(status & BIT(0)) && !force_rfkill)
 724                 return 0;
 725
 726         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 727                 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
 728                                            RFKILL_TYPE_WLAN,
 729                                            &dell_rfkill_ops, (void *) 1);
 730                 if (!wifi_rfkill) {
 731                         ret = -ENOMEM;
 732                         goto err_wifi;
 733                 }
 734                 ret = rfkill_register(wifi_rfkill);
 735                 if (ret)
 736                         goto err_wifi;
 737         }
 738
 739         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 740                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
 741                                                 &platform_device->dev,
 742                                                 RFKILL_TYPE_BLUETOOTH,
 743                                                 &dell_rfkill_ops, (void *) 2);
 744                 if (!bluetooth_rfkill) {
 745                         ret = -ENOMEM;
 746                         goto err_bluetooth;
 747                 }
 748                 ret = rfkill_register(bluetooth_rfkill);
 749                 if (ret)
 750                         goto err_bluetooth;
 751         }
 752
 753         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 754                 wwan_rfkill = rfkill_alloc("dell-wwan",
 755                                            &platform_device->dev,
 756                                            RFKILL_TYPE_WWAN,
 757                                            &dell_rfkill_ops, (void *) 3);
 758                 if (!wwan_rfkill) {
 759                         ret = -ENOMEM;
 760                         goto err_wwan;
 761                 }
 762                 ret = rfkill_register(wwan_rfkill);
 763                 if (ret)
 764                         goto err_wwan;
 765         }
 766
 767         /*
 768          * Dell Airplane Mode Switch driver (dell-rbtn) supports ACPI devices
 769          * which can receive events from HW slider switch.
 770          *
 771          * Dell SMBIOS on whitelisted models supports controlling radio devices
 772          * but does not support receiving HW button switch events. We can use
 773          * i8042 filter hook function to receive keyboard data and handle
 774          * keycode for HW button.
 775          *
 776          * So if it is possible we will use Dell Airplane Mode Switch ACPI
 777          * driver for receiving HW events and Dell SMBIOS for setting rfkill
 778          * states. If ACPI driver or device is not available we will fallback to
 779          * i8042 filter hook function.
 780          *
 781          * To prevent duplicate rfkill devices which control and do same thing,
 782          * dell-rbtn driver will automatically remove its own rfkill devices
 783          * once function dell_rbtn_notifier_register() is called.
 784          */
 785
 786         dell_rbtn_notifier_register_func =
 787                 symbol_request(dell_rbtn_notifier_register);
 788         if (dell_rbtn_notifier_register_func) {
 789                 dell_rbtn_notifier_unregister_func =
 790                         symbol_request(dell_rbtn_notifier_unregister);
 791                 if (!dell_rbtn_notifier_unregister_func) {
 792                         symbol_put(dell_rbtn_notifier_register);
 793                         dell_rbtn_notifier_register_func = NULL;
 794                 }
 795         }
 796
 797         if (dell_rbtn_notifier_register_func) {
 798                 ret = dell_rbtn_notifier_register_func(
 799                         &dell_laptop_rbtn_notifier);
 800                 symbol_put(dell_rbtn_notifier_register);
 801                 dell_rbtn_notifier_register_func = NULL;
 802                 if (ret != 0) {
 803                         symbol_put(dell_rbtn_notifier_unregister);
 804                         dell_rbtn_notifier_unregister_func = NULL;
 805                 }
 806         } else {
 807                 pr_info("Symbols from dell-rbtn acpi driver are not available\n");
 808                 ret = -ENODEV;
 809         }
 810
 811         if (ret == 0) {
 812                 pr_info("Using dell-rbtn acpi driver for receiving events\n");
 813         } else if (ret != -ENODEV) {
 814                 pr_warn("Unable to register dell rbtn notifier\n");
 815                 goto err_filter;
 816         } else {
 817                 ret = i8042_install_filter(dell_laptop_i8042_filter);
 818                 if (ret) {
 819                         pr_warn("Unable to install key filter\n");
 820                         goto err_filter;
 821                 }
 822                 pr_info("Using i8042 filter function for receiving events\n");
 823         }
 824
 825         return 0;
 826 err_filter:
 827         if (wwan_rfkill)
 828                 rfkill_unregister(wwan_rfkill);
 829 err_wwan:
 830         rfkill_destroy(wwan_rfkill);
 831         if (bluetooth_rfkill)
 832                 rfkill_unregister(bluetooth_rfkill);
 833 err_bluetooth:
 834         rfkill_destroy(bluetooth_rfkill);
 835         if (wifi_rfkill)
 836                 rfkill_unregister(wifi_rfkill);
 837 err_wifi:
 838         rfkill_destroy(wifi_rfkill);
 839
 840         return ret;
 841 }
 842
 843 static void dell_cleanup_rfkill(void)
 844 {
 845         if (dell_rbtn_notifier_unregister_func) {
 846                 dell_rbtn_notifier_unregister_func(&dell_laptop_rbtn_notifier);
 847                 symbol_put(dell_rbtn_notifier_unregister);
 848                 dell_rbtn_notifier_unregister_func = NULL;
 849         } else {
 850                 i8042_remove_filter(dell_laptop_i8042_filter);
 851         }
 852         cancel_delayed_work_sync(&dell_rfkill_work);
 853         if (wifi_rfkill) {
 854                 rfkill_unregister(wifi_rfkill);
 855                 rfkill_destroy(wifi_rfkill);
 856         }
 857         if (bluetooth_rfkill) {
 858                 rfkill_unregister(bluetooth_rfkill);
 859                 rfkill_destroy(bluetooth_rfkill);
 860         }
 861         if (wwan_rfkill) {
 862                 rfkill_unregister(wwan_rfkill);
 863                 rfkill_destroy(wwan_rfkill);
 864         }
 865 }
 866
 867 static int dell_send_intensity(struct backlight_device *bd)
 868 {
 869         int token;
 870         int ret;
 871
 872         token = find_token_location(BRIGHTNESS_TOKEN);
 873         if (token == -1)
 874                 return -ENODEV;
 875
 876         dell_smbios_get_buffer();
 877         buffer->input[0] = token;
 878         buffer->input[1] = bd->props.brightness;
 879
 880         if (power_supply_is_system_supplied() > 0)
 881                 dell_send_request(buffer, 1, 2);
 882         else
 883                 dell_send_request(buffer, 1, 1);
 884
 885         ret = dell_smi_error(buffer->output[0]);
 886
 887         dell_smbios_release_buffer();
 888         return ret;
 889 }
 890
 891 static int dell_get_intensity(struct backlight_device *bd)
 892 {
 893         int token;
 894         int ret;
 895
 896         token = find_token_location(BRIGHTNESS_TOKEN);
 897         if (token == -1)
 898                 return -ENODEV;
 899
 900         dell_smbios_get_buffer();
 901         buffer->input[0] = token;
 902
 903         if (power_supply_is_system_supplied() > 0)
 904                 dell_send_request(buffer, 0, 2);
 905         else
 906                 dell_send_request(buffer, 0, 1);
 907
 908         if (buffer->output[0])
 909                 ret = dell_smi_error(buffer->output[0]);
 910         else
 911                 ret = buffer->output[1];
 912
 913         dell_smbios_release_buffer();
 914         return ret;
 915 }
 916
 917 static const struct backlight_ops dell_ops = {
 918         .get_brightness = dell_get_intensity,
 919         .update_status  = dell_send_intensity,
 920 };
 921
 922 static void touchpad_led_on(void)
 923 {
 924         int command = 0x97;
 925         char data = 1;
 926         i8042_command(&data, command | 1 << 12);
 927 }
 928
 929 static void touchpad_led_off(void)
 930 {
 931         int command = 0x97;
 932         char data = 2;
 933         i8042_command(&data, command | 1 << 12);
 934 }
 935
 936 static void touchpad_led_set(struct led_classdev *led_cdev,
 937         enum led_brightness value)
 938 {
 939         if (value > 0)
 940                 touchpad_led_on();
 941         else
 942                 touchpad_led_off();
 943 }
 944
 945 static struct led_classdev touchpad_led = {
 946         .name = "dell-laptop::touchpad",
 947         .brightness_set = touchpad_led_set,
 948         .flags = LED_CORE_SUSPENDRESUME,
 949 };
 950
 951 static int __init touchpad_led_init(struct device *dev)
 952 {
 953         return led_classdev_register(dev, &touchpad_led);
 954 }
 955
 956 static void touchpad_led_exit(void)
 957 {
 958         led_classdev_unregister(&touchpad_led);
 959 }
 960
 961 /*
 962  * Derived from information in smbios-keyboard-ctl:
 963  *
 964  * cbClass 4
 965  * cbSelect 11
 966  * Keyboard illumination
 967  * cbArg1 determines the function to be performed
 968  *
 969  * cbArg1 0x0 = Get Feature Information
 970  *  cbRES1         Standard return codes (0, -1, -2)
 971  *  cbRES2, word0  Bitmap of user-selectable modes
 972  *     bit 0     Always off (All systems)
 973  *     bit 1     Always on (Travis ATG, Siberia)
 974  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
 975  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
 976  *     bit 4     Auto: Input-activity-based On; input-activity based Off
 977  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
 978  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
 979  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
 980  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
 981  *     bits 9-15 Reserved for future use
 982  *  cbRES2, byte2  Reserved for future use
 983  *  cbRES2, byte3  Keyboard illumination type
 984  *     0         Reserved
 985  *     1         Tasklight
 986  *     2         Backlight
 987  *     3-255     Reserved for future use
 988  *  cbRES3, byte0  Supported auto keyboard illumination trigger bitmap.
 989  *     bit 0     Any keystroke
 990  *     bit 1     Touchpad activity
 991  *     bit 2     Pointing stick
 992  *     bit 3     Any mouse
 993  *     bits 4-7  Reserved for future use
 994  *  cbRES3, byte1  Supported timeout unit bitmap
 995  *     bit 0     Seconds
 996  *     bit 1     Minutes
 997  *     bit 2     Hours
 998  *     bit 3     Days
 999  *     bits 4-7  Reserved for future use
1000  *  cbRES3, byte2  Number of keyboard light brightness levels
1001  *  cbRES4, byte0  Maximum acceptable seconds value (0 if seconds not supported).
1002  *  cbRES4, byte1  Maximum acceptable minutes value (0 if minutes not supported).
1003  *  cbRES4, byte2  Maximum acceptable hours value (0 if hours not supported).
1004  *  cbRES4, byte3  Maximum acceptable days value (0 if days not supported)
1005  *
1006  * cbArg1 0x1 = Get Current State
1007  *  cbRES1         Standard return codes (0, -1, -2)
1008  *  cbRES2, word0  Bitmap of current mode state
1009  *     bit 0     Always off (All systems)
1010  *     bit 1     Always on (Travis ATG, Siberia)
1011  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1012  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1013  *     bit 4     Auto: Input-activity-based On; input-activity based Off
1014  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1015  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1016  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1017  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1018  *     bits 9-15 Reserved for future use
1019  *     Note: Only One bit can be set
1020  *  cbRES2, byte2  Currently active auto keyboard illumination triggers.
1021  *     bit 0     Any keystroke
1022  *     bit 1     Touchpad activity
1023  *     bit 2     Pointing stick
1024  *     bit 3     Any mouse
1025  *     bits 4-7  Reserved for future use
1026  *  cbRES2, byte3  Current Timeout
1027  *     bits 7:6  Timeout units indicator:
1028  *     00b       Seconds
1029  *     01b       Minutes
1030  *     10b       Hours
1031  *     11b       Days
1032  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1033  *     NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte
1034  *     are set upon return from the [Get feature information] call.
1035  *  cbRES3, byte0  Current setting of ALS value that turns the light on or off.
1036  *  cbRES3, byte1  Current ALS reading
1037  *  cbRES3, byte2  Current keyboard light level.
1038  *
1039  * cbArg1 0x2 = Set New State
1040  *  cbRES1         Standard return codes (0, -1, -2)
1041  *  cbArg2, word0  Bitmap of current mode state
1042  *     bit 0     Always off (All systems)
1043  *     bit 1     Always on (Travis ATG, Siberia)
1044  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1045  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1046  *     bit 4     Auto: Input-activity-based On; input-activity based Off
1047  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1048  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1049  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1050  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1051  *     bits 9-15 Reserved for future use
1052  *     Note: Only One bit can be set
1053  *  cbArg2, byte2  Desired auto keyboard illumination triggers. Must remain inactive to allow
1054  *                 keyboard to turn off automatically.
1055  *     bit 0     Any keystroke
1056  *     bit 1     Touchpad activity
1057  *     bit 2     Pointing stick
1058  *     bit 3     Any mouse
1059  *     bits 4-7  Reserved for future use
1060  *  cbArg2, byte3  Desired Timeout
1061  *     bits 7:6  Timeout units indicator:
1062  *     00b       Seconds
1063  *     01b       Minutes
1064  *     10b       Hours
1065  *     11b       Days
1066  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1067  *  cbArg3, byte0  Desired setting of ALS value that turns the light on or off.
1068  *  cbArg3, byte2  Desired keyboard light level.
1069  */
1070
1071
1072 enum kbd_timeout_unit {
1073         KBD_TIMEOUT_SECONDS = 0,
1074         KBD_TIMEOUT_MINUTES,
1075         KBD_TIMEOUT_HOURS,
1076         KBD_TIMEOUT_DAYS,
1077 };
1078
1079 enum kbd_mode_bit {
1080         KBD_MODE_BIT_OFF = 0,
1081         KBD_MODE_BIT_ON,
1082         KBD_MODE_BIT_ALS,
1083         KBD_MODE_BIT_TRIGGER_ALS,
1084         KBD_MODE_BIT_TRIGGER,
1085         KBD_MODE_BIT_TRIGGER_25,
1086         KBD_MODE_BIT_TRIGGER_50,
1087         KBD_MODE_BIT_TRIGGER_75,
1088         KBD_MODE_BIT_TRIGGER_100,
1089 };
1090
1091 #define kbd_is_als_mode_bit(bit) \
1092         ((bit) == KBD_MODE_BIT_ALS || (bit) == KBD_MODE_BIT_TRIGGER_ALS)
1093 #define kbd_is_trigger_mode_bit(bit) \
1094         ((bit) >= KBD_MODE_BIT_TRIGGER_ALS && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1095 #define kbd_is_level_mode_bit(bit) \
1096         ((bit) >= KBD_MODE_BIT_TRIGGER_25 && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1097
1098 struct kbd_info {
1099         u16 modes;
1100         u8 type;
1101         u8 triggers;
1102         u8 levels;
1103         u8 seconds;
1104         u8 minutes;
1105         u8 hours;
1106         u8 days;
1107 };
1108
1109 struct kbd_state {
1110         u8 mode_bit;
1111         u8 triggers;
1112         u8 timeout_value;
1113         u8 timeout_unit;
1114         u8 als_setting;
1115         u8 als_value;
1116         u8 level;
1117 };
1118
1119 static const int kbd_tokens[] = {
1120         KBD_LED_OFF_TOKEN,
1121         KBD_LED_AUTO_25_TOKEN,
1122         KBD_LED_AUTO_50_TOKEN,
1123         KBD_LED_AUTO_75_TOKEN,
1124         KBD_LED_AUTO_100_TOKEN,
1125         KBD_LED_ON_TOKEN,
1126 };
1127
1128 static u16 kbd_token_bits;
1129
1130 static struct kbd_info kbd_info;
1131 static bool kbd_als_supported;
1132 static bool kbd_triggers_supported;
1133
1134 static u8 kbd_mode_levels[16];
1135 static int kbd_mode_levels_count;
1136
1137 static u8 kbd_previous_level;
1138 static u8 kbd_previous_mode_bit;
1139
1140 static bool kbd_led_present;
1141
1142 /*
1143  * NOTE: there are three ways to set the keyboard backlight level.
1144  * First, via kbd_state.mode_bit (assigning KBD_MODE_BIT_TRIGGER_* value).
1145  * Second, via kbd_state.level (assigning numerical value <= kbd_info.levels).
1146  * Third, via SMBIOS tokens (KBD_LED_* in kbd_tokens)
1147  *
1148  * There are laptops which support only one of these methods. If we want to
1149  * support as many machines as possible we need to implement all three methods.
1150  * The first two methods use the kbd_state structure. The third uses SMBIOS
1151  * tokens. If kbd_info.levels == 0, the machine does not support setting the
1152  * keyboard backlight level via kbd_state.level.
1153  */
1154
1155 static int kbd_get_info(struct kbd_info *info)
1156 {
1157         u8 units;
1158         int ret;
1159
1160         dell_smbios_get_buffer();
1161
1162         buffer->input[0] = 0x0;
1163         dell_send_request(buffer, 4, 11);
1164         ret = buffer->output[0];
1165
1166         if (ret) {
1167                 ret = dell_smi_error(ret);
1168                 goto out;
1169         }
1170
1171         info->modes = buffer->output[1] & 0xFFFF;
1172         info->type = (buffer->output[1] >> 24) & 0xFF;
1173         info->triggers = buffer->output[2] & 0xFF;
1174         units = (buffer->output[2] >> 8) & 0xFF;
1175         info->levels = (buffer->output[2] >> 16) & 0xFF;
1176
1177         if (units & BIT(0))
1178                 info->seconds = (buffer->output[3] >> 0) & 0xFF;
1179         if (units & BIT(1))
1180                 info->minutes = (buffer->output[3] >> 8) & 0xFF;
1181         if (units & BIT(2))
1182                 info->hours = (buffer->output[3] >> 16) & 0xFF;
1183         if (units & BIT(3))
1184                 info->days = (buffer->output[3] >> 24) & 0xFF;
1185
1186  out:
1187         dell_smbios_release_buffer();
1188         return ret;
1189 }
1190
1191 static unsigned int kbd_get_max_level(void)
1192 {
1193         if (kbd_info.levels != 0)
1194                 return kbd_info.levels;
1195         if (kbd_mode_levels_count > 0)
1196                 return kbd_mode_levels_count - 1;
1197         return 0;
1198 }
1199
1200 static int kbd_get_level(struct kbd_state *state)
1201 {
1202         int i;
1203
1204         if (kbd_info.levels != 0)
1205                 return state->level;
1206
1207         if (kbd_mode_levels_count > 0) {
1208                 for (i = 0; i < kbd_mode_levels_count; ++i)
1209                         if (kbd_mode_levels[i] == state->mode_bit)
1210                                 return i;
1211                 return 0;
1212         }
1213
1214         return -EINVAL;
1215 }
1216
1217 static int kbd_set_level(struct kbd_state *state, u8 level)
1218 {
1219         if (kbd_info.levels != 0) {
1220                 if (level != 0)
1221                         kbd_previous_level = level;
1222                 if (state->level == level)
1223                         return 0;
1224                 state->level = level;
1225                 if (level != 0 && state->mode_bit == KBD_MODE_BIT_OFF)
1226                         state->mode_bit = kbd_previous_mode_bit;
1227                 else if (level == 0 && state->mode_bit != KBD_MODE_BIT_OFF) {
1228                         kbd_previous_mode_bit = state->mode_bit;
1229                         state->mode_bit = KBD_MODE_BIT_OFF;
1230                 }
1231                 return 0;
1232         }
1233
1234         if (kbd_mode_levels_count > 0 && level < kbd_mode_levels_count) {
1235                 if (level != 0)
1236                         kbd_previous_level = level;
1237                 state->mode_bit = kbd_mode_levels[level];
1238                 return 0;
1239         }
1240
1241         return -EINVAL;
1242 }
1243
1244 static int kbd_get_state(struct kbd_state *state)
1245 {
1246         int ret;
1247
1248         dell_smbios_get_buffer();
1249
1250         buffer->input[0] = 0x1;
1251         dell_send_request(buffer, 4, 11);
1252         ret = buffer->output[0];
1253
1254         if (ret) {
1255                 ret = dell_smi_error(ret);
1256                 goto out;
1257         }
1258
1259         state->mode_bit = ffs(buffer->output[1] & 0xFFFF);
1260         if (state->mode_bit != 0)
1261                 state->mode_bit--;
1262
1263         state->triggers = (buffer->output[1] >> 16) & 0xFF;
1264         state->timeout_value = (buffer->output[1] >> 24) & 0x3F;
1265         state->timeout_unit = (buffer->output[1] >> 30) & 0x3;
1266         state->als_setting = buffer->output[2] & 0xFF;
1267         state->als_value = (buffer->output[2] >> 8) & 0xFF;
1268         state->level = (buffer->output[2] >> 16) & 0xFF;
1269
1270  out:
1271         dell_smbios_release_buffer();
1272         return ret;
1273 }
1274
1275 static int kbd_set_state(struct kbd_state *state)
1276 {
1277         int ret;
1278
1279         dell_smbios_get_buffer();
1280         buffer->input[0] = 0x2;
1281         buffer->input[1] = BIT(state->mode_bit) & 0xFFFF;
1282         buffer->input[1] |= (state->triggers & 0xFF) << 16;
1283         buffer->input[1] |= (state->timeout_value & 0x3F) << 24;
1284         buffer->input[1] |= (state->timeout_unit & 0x3) << 30;
1285         buffer->input[2] = state->als_setting & 0xFF;
1286         buffer->input[2] |= (state->level & 0xFF) << 16;
1287         dell_send_request(buffer, 4, 11);
1288         ret = buffer->output[0];
1289         dell_smbios_release_buffer();
1290
1291         return dell_smi_error(ret);
1292 }
1293
1294 static int kbd_set_state_safe(struct kbd_state *state, struct kbd_state *old)
1295 {
1296         int ret;
1297
1298         ret = kbd_set_state(state);
1299         if (ret == 0)
1300                 return 0;
1301
1302         /*
1303          * When setting the new state fails,try to restore the previous one.
1304          * This is needed on some machines where BIOS sets a default state when
1305          * setting a new state fails. This default state could be all off.
1306          */
1307
1308         if (kbd_set_state(old))
1309                 pr_err("Setting old previous keyboard state failed\n");
1310
1311         return ret;
1312 }
1313
1314 static int kbd_set_token_bit(u8 bit)
1315 {
1316         int id;
1317         int ret;
1318
1319         if (bit >= ARRAY_SIZE(kbd_tokens))
1320                 return -EINVAL;
1321
1322         id = find_token_id(kbd_tokens[bit]);
1323         if (id == -1)
1324                 return -EINVAL;
1325
1326         dell_smbios_get_buffer();
1327         buffer->input[0] = da_tokens[id].location;
1328         buffer->input[1] = da_tokens[id].value;
1329         dell_send_request(buffer, 1, 0);
1330         ret = buffer->output[0];
1331         dell_smbios_release_buffer();
1332
1333         return dell_smi_error(ret);
1334 }
1335
1336 static int kbd_get_token_bit(u8 bit)
1337 {
1338         int id;
1339         int ret;
1340         int val;
1341
1342         if (bit >= ARRAY_SIZE(kbd_tokens))
1343                 return -EINVAL;
1344
1345         id = find_token_id(kbd_tokens[bit]);
1346         if (id == -1)
1347                 return -EINVAL;
1348
1349         dell_smbios_get_buffer();
1350         buffer->input[0] = da_tokens[id].location;
1351         dell_send_request(buffer, 0, 0);
1352         ret = buffer->output[0];
1353         val = buffer->output[1];
1354         dell_smbios_release_buffer();
1355
1356         if (ret)
1357                 return dell_smi_error(ret);
1358
1359         return (val == da_tokens[id].value);
1360 }
1361
1362 static int kbd_get_first_active_token_bit(void)
1363 {
1364         int i;
1365         int ret;
1366
1367         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i) {
1368                 ret = kbd_get_token_bit(i);
1369                 if (ret == 1)
1370                         return i;
1371         }
1372
1373         return ret;
1374 }
1375
1376 static int kbd_get_valid_token_counts(void)
1377 {
1378         return hweight16(kbd_token_bits);
1379 }
1380
1381 static inline int kbd_init_info(void)
1382 {
1383         struct kbd_state state;
1384         int ret;
1385         int i;
1386
1387         ret = kbd_get_info(&kbd_info);
1388         if (ret)
1389                 return ret;
1390
1391         kbd_get_state(&state);
1392
1393         /* NOTE: timeout value is stored in 6 bits so max value is 63 */
1394         if (kbd_info.seconds > 63)
1395                 kbd_info.seconds = 63;
1396         if (kbd_info.minutes > 63)
1397                 kbd_info.minutes = 63;
1398         if (kbd_info.hours > 63)
1399                 kbd_info.hours = 63;
1400         if (kbd_info.days > 63)
1401                 kbd_info.days = 63;
1402
1403         /* NOTE: On tested machines ON mode did not work and caused
1404          *       problems (turned backlight off) so do not use it
1405          */
1406         kbd_info.modes &= ~BIT(KBD_MODE_BIT_ON);
1407
1408         kbd_previous_level = kbd_get_level(&state);
1409         kbd_previous_mode_bit = state.mode_bit;
1410
1411         if (kbd_previous_level == 0 && kbd_get_max_level() != 0)
1412                 kbd_previous_level = 1;
1413
1414         if (kbd_previous_mode_bit == KBD_MODE_BIT_OFF) {
1415                 kbd_previous_mode_bit =
1416                         ffs(kbd_info.modes & ~BIT(KBD_MODE_BIT_OFF));
1417                 if (kbd_previous_mode_bit != 0)
1418                         kbd_previous_mode_bit--;
1419         }
1420
1421         if (kbd_info.modes & (BIT(KBD_MODE_BIT_ALS) |
1422                               BIT(KBD_MODE_BIT_TRIGGER_ALS)))
1423                 kbd_als_supported = true;
1424
1425         if (kbd_info.modes & (
1426             BIT(KBD_MODE_BIT_TRIGGER_ALS) | BIT(KBD_MODE_BIT_TRIGGER) |
1427             BIT(KBD_MODE_BIT_TRIGGER_25) | BIT(KBD_MODE_BIT_TRIGGER_50) |
1428             BIT(KBD_MODE_BIT_TRIGGER_75) | BIT(KBD_MODE_BIT_TRIGGER_100)
1429            ))
1430                 kbd_triggers_supported = true;
1431
1432         /* kbd_mode_levels[0] is reserved, see below */
1433         for (i = 0; i < 16; ++i)
1434                 if (kbd_is_level_mode_bit(i) && (BIT(i) & kbd_info.modes))
1435                         kbd_mode_levels[1 + kbd_mode_levels_count++] = i;
1436
1437         /*
1438          * Find the first supported mode and assign to kbd_mode_levels[0].
1439          * This should be 0 (off), but we cannot depend on the BIOS to
1440          * support 0.
1441          */
1442         if (kbd_mode_levels_count > 0) {
1443                 for (i = 0; i < 16; ++i) {
1444                         if (BIT(i) & kbd_info.modes) {
1445                                 kbd_mode_levels[0] = i;
1446                                 break;
1447                         }
1448                 }
1449                 kbd_mode_levels_count++;
1450         }
1451
1452         return 0;
1453
1454 }
1455
1456 static inline void kbd_init_tokens(void)
1457 {
1458         int i;
1459
1460         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i)
1461                 if (find_token_id(kbd_tokens[i]) != -1)
1462                         kbd_token_bits |= BIT(i);
1463 }
1464
1465 static void kbd_init(void)
1466 {
1467         int ret;
1468
1469         ret = kbd_init_info();
1470         kbd_init_tokens();
1471
1472         if (kbd_token_bits != 0 || ret == 0)
1473                 kbd_led_present = true;
1474 }
1475
1476 static ssize_t kbd_led_timeout_store(struct device *dev,
1477                                      struct device_attribute *attr,
1478                                      const char *buf, size_t count)
1479 {
1480         struct kbd_state new_state;
1481         struct kbd_state state;
1482         bool convert;
1483         int value;
1484         int ret;
1485         char ch;
1486         u8 unit;
1487         int i;
1488
1489         ret = sscanf(buf, "%d %c", &value, &ch);
1490         if (ret < 1)
1491                 return -EINVAL;
1492         else if (ret == 1)
1493                 ch = 's';
1494
1495         if (value < 0)
1496                 return -EINVAL;
1497
1498         convert = false;
1499
1500         switch (ch) {
1501         case 's':
1502                 if (value > kbd_info.seconds)
1503                         convert = true;
1504                 unit = KBD_TIMEOUT_SECONDS;
1505                 break;
1506         case 'm':
1507                 if (value > kbd_info.minutes)
1508                         convert = true;
1509                 unit = KBD_TIMEOUT_MINUTES;
1510                 break;
1511         case 'h':
1512                 if (value > kbd_info.hours)
1513                         convert = true;
1514                 unit = KBD_TIMEOUT_HOURS;
1515                 break;
1516         case 'd':
1517                 if (value > kbd_info.days)
1518                         convert = true;
1519                 unit = KBD_TIMEOUT_DAYS;
1520                 break;
1521         default:
1522                 return -EINVAL;
1523         }
1524
1525         if (quirks && quirks->needs_kbd_timeouts)
1526                 convert = true;
1527
1528         if (convert) {
1529                 /* Convert value from current units to seconds */
1530                 switch (unit) {
1531                 case KBD_TIMEOUT_DAYS:
1532                         value *= 24;
1533                 case KBD_TIMEOUT_HOURS:
1534                         value *= 60;
1535                 case KBD_TIMEOUT_MINUTES:
1536                         value *= 60;
1537                         unit = KBD_TIMEOUT_SECONDS;
1538                 }
1539
1540                 if (quirks && quirks->needs_kbd_timeouts) {
1541                         for (i = 0; quirks->kbd_timeouts[i] != -1; i++) {
1542                                 if (value <= quirks->kbd_timeouts[i]) {
1543                                         value = quirks->kbd_timeouts[i];
1544                                         break;
1545                                 }
1546                         }
1547                 }
1548
1549                 if (value <= kbd_info.seconds && kbd_info.seconds) {
1550                         unit = KBD_TIMEOUT_SECONDS;
1551                 } else if (value / 60 <= kbd_info.minutes && kbd_info.minutes) {
1552                         value /= 60;
1553                         unit = KBD_TIMEOUT_MINUTES;
1554                 } else if (value / (60 * 60) <= kbd_info.hours && kbd_info.hours) {
1555                         value /= (60 * 60);
1556                         unit = KBD_TIMEOUT_HOURS;
1557                 } else if (value / (60 * 60 * 24) <= kbd_info.days && kbd_info.days) {
1558                         value /= (60 * 60 * 24);
1559                         unit = KBD_TIMEOUT_DAYS;
1560                 } else {
1561                         return -EINVAL;
1562                 }
1563         }
1564
1565         ret = kbd_get_state(&state);
1566         if (ret)
1567                 return ret;
1568
1569         new_state = state;
1570         new_state.timeout_value = value;
1571         new_state.timeout_unit = unit;
1572
1573         ret = kbd_set_state_safe(&new_state, &state);
1574         if (ret)
1575                 return ret;
1576
1577         return count;
1578 }
1579
1580 static ssize_t kbd_led_timeout_show(struct device *dev,
1581                                     struct device_attribute *attr, char *buf)
1582 {
1583         struct kbd_state state;
1584         int ret;
1585         int len;
1586
1587         ret = kbd_get_state(&state);
1588         if (ret)
1589                 return ret;
1590
1591         len = sprintf(buf, "%d", state.timeout_value);
1592
1593         switch (state.timeout_unit) {
1594         case KBD_TIMEOUT_SECONDS:
1595                 return len + sprintf(buf+len, "s\n");
1596         case KBD_TIMEOUT_MINUTES:
1597                 return len + sprintf(buf+len, "m\n");
1598         case KBD_TIMEOUT_HOURS:
1599                 return len + sprintf(buf+len, "h\n");
1600         case KBD_TIMEOUT_DAYS:
1601                 return len + sprintf(buf+len, "d\n");
1602         default:
1603                 return -EINVAL;
1604         }
1605
1606         return len;
1607 }
1608
1609 static DEVICE_ATTR(stop_timeout, S_IRUGO | S_IWUSR,
1610                    kbd_led_timeout_show, kbd_led_timeout_store);
1611
1612 static const char * const kbd_led_triggers[] = {
1613         "keyboard",
1614         "touchpad",
1615         /*"trackstick"*/ NULL, /* NOTE: trackstick is just alias for touchpad */
1616         "mouse",
1617 };
1618
1619 static ssize_t kbd_led_triggers_store(struct device *dev,
1620                                       struct device_attribute *attr,
1621                                       const char *buf, size_t count)
1622 {
1623         struct kbd_state new_state;
1624         struct kbd_state state;
1625         bool triggers_enabled = false;
1626         int trigger_bit = -1;
1627         char trigger[21];
1628         int i, ret;
1629
1630         ret = sscanf(buf, "%20s", trigger);
1631         if (ret != 1)
1632                 return -EINVAL;
1633
1634         if (trigger[0] != '+' && trigger[0] != '-')
1635                 return -EINVAL;
1636
1637         ret = kbd_get_state(&state);
1638         if (ret)
1639                 return ret;
1640
1641         if (kbd_triggers_supported)
1642                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1643
1644         if (kbd_triggers_supported) {
1645                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1646                         if (!(kbd_info.triggers & BIT(i)))
1647                                 continue;
1648                         if (!kbd_led_triggers[i])
1649                                 continue;
1650                         if (strcmp(trigger+1, kbd_led_triggers[i]) != 0)
1651                                 continue;
1652                         if (trigger[0] == '+' &&
1653                             triggers_enabled && (state.triggers & BIT(i)))
1654                                 return count;
1655                         if (trigger[0] == '-' &&
1656                             (!triggers_enabled || !(state.triggers & BIT(i))))
1657                                 return count;
1658                         trigger_bit = i;
1659                         break;
1660                 }
1661         }
1662
1663         if (trigger_bit != -1) {
1664                 new_state = state;
1665                 if (trigger[0] == '+')
1666                         new_state.triggers |= BIT(trigger_bit);
1667                 else {
1668                         new_state.triggers &= ~BIT(trigger_bit);
1669                         /* NOTE: trackstick bit (2) must be disabled when
1670                          *       disabling touchpad bit (1), otherwise touchpad
1671                          *       bit (1) will not be disabled */
1672                         if (trigger_bit == 1)
1673                                 new_state.triggers &= ~BIT(2);
1674                 }
1675                 if ((kbd_info.triggers & new_state.triggers) !=
1676                     new_state.triggers)
1677                         return -EINVAL;
1678                 if (new_state.triggers && !triggers_enabled) {
1679                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1680                         kbd_set_level(&new_state, kbd_previous_level);
1681                 } else if (new_state.triggers == 0) {
1682                         kbd_set_level(&new_state, 0);
1683                 }
1684                 if (!(kbd_info.modes & BIT(new_state.mode_bit)))
1685                         return -EINVAL;
1686                 ret = kbd_set_state_safe(&new_state, &state);
1687                 if (ret)
1688                         return ret;
1689                 if (new_state.mode_bit != KBD_MODE_BIT_OFF)
1690                         kbd_previous_mode_bit = new_state.mode_bit;
1691                 return count;
1692         }
1693
1694         return -EINVAL;
1695 }
1696
1697 static ssize_t kbd_led_triggers_show(struct device *dev,
1698                                      struct device_attribute *attr, char *buf)
1699 {
1700         struct kbd_state state;
1701         bool triggers_enabled;
1702         int level, i, ret;
1703         int len = 0;
1704
1705         ret = kbd_get_state(&state);
1706         if (ret)
1707                 return ret;
1708
1709         len = 0;
1710
1711         if (kbd_triggers_supported) {
1712                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1713                 level = kbd_get_level(&state);
1714                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1715                         if (!(kbd_info.triggers & BIT(i)))
1716                                 continue;
1717                         if (!kbd_led_triggers[i])
1718                                 continue;
1719                         if ((triggers_enabled || level <= 0) &&
1720                             (state.triggers & BIT(i)))
1721                                 buf[len++] = '+';
1722                         else
1723                                 buf[len++] = '-';
1724                         len += sprintf(buf+len, "%s ", kbd_led_triggers[i]);
1725                 }
1726         }
1727
1728         if (len)
1729                 buf[len - 1] = '\n';
1730
1731         return len;
1732 }
1733
1734 static DEVICE_ATTR(start_triggers, S_IRUGO | S_IWUSR,
1735                    kbd_led_triggers_show, kbd_led_triggers_store);
1736
1737 static ssize_t kbd_led_als_enabled_store(struct device *dev,
1738                                          struct device_attribute *attr,
1739                                          const char *buf, size_t count)
1740 {
1741         struct kbd_state new_state;
1742         struct kbd_state state;
1743         bool triggers_enabled = false;
1744         int enable;
1745         int ret;
1746
1747         ret = kstrtoint(buf, 0, &enable);
1748         if (ret)
1749                 return ret;
1750
1751         ret = kbd_get_state(&state);
1752         if (ret)
1753                 return ret;
1754
1755         if (enable == kbd_is_als_mode_bit(state.mode_bit))
1756                 return count;
1757
1758         new_state = state;
1759
1760         if (kbd_triggers_supported)
1761                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1762
1763         if (enable) {
1764                 if (triggers_enabled)
1765                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER_ALS;
1766                 else
1767                         new_state.mode_bit = KBD_MODE_BIT_ALS;
1768         } else {
1769                 if (triggers_enabled) {
1770                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1771                         kbd_set_level(&new_state, kbd_previous_level);
1772                 } else {
1773                         new_state.mode_bit = KBD_MODE_BIT_ON;
1774                 }
1775         }
1776         if (!(kbd_info.modes & BIT(new_state.mode_bit)))
1777                 return -EINVAL;
1778
1779         ret = kbd_set_state_safe(&new_state, &state);
1780         if (ret)
1781                 return ret;
1782         kbd_previous_mode_bit = new_state.mode_bit;
1783
1784         return count;
1785 }
1786
1787 static ssize_t kbd_led_als_enabled_show(struct device *dev,
1788                                         struct device_attribute *attr,
1789                                         char *buf)
1790 {
1791         struct kbd_state state;
1792         bool enabled = false;
1793         int ret;
1794
1795         ret = kbd_get_state(&state);
1796         if (ret)
1797                 return ret;
1798         enabled = kbd_is_als_mode_bit(state.mode_bit);
1799
1800         return sprintf(buf, "%d\n", enabled ? 1 : 0);
1801 }
1802
1803 static DEVICE_ATTR(als_enabled, S_IRUGO | S_IWUSR,
1804                    kbd_led_als_enabled_show, kbd_led_als_enabled_store);
1805
1806 static ssize_t kbd_led_als_setting_store(struct device *dev,
1807                                          struct device_attribute *attr,
1808                                          const char *buf, size_t count)
1809 {
1810         struct kbd_state state;
1811         struct kbd_state new_state;
1812         u8 setting;
1813         int ret;
1814
1815         ret = kstrtou8(buf, 10, &setting);
1816         if (ret)
1817                 return ret;
1818
1819         ret = kbd_get_state(&state);
1820         if (ret)
1821                 return ret;
1822
1823         new_state = state;
1824         new_state.als_setting = setting;
1825
1826         ret = kbd_set_state_safe(&new_state, &state);
1827         if (ret)
1828                 return ret;
1829
1830         return count;
1831 }
1832
1833 static ssize_t kbd_led_als_setting_show(struct device *dev,
1834                                         struct device_attribute *attr,
1835                                         char *buf)
1836 {
1837         struct kbd_state state;
1838         int ret;
1839
1840         ret = kbd_get_state(&state);
1841         if (ret)
1842                 return ret;
1843
1844         return sprintf(buf, "%d\n", state.als_setting);
1845 }
1846
1847 static DEVICE_ATTR(als_setting, S_IRUGO | S_IWUSR,
1848                    kbd_led_als_setting_show, kbd_led_als_setting_store);
1849
1850 static struct attribute *kbd_led_attrs[] = {
1851         &dev_attr_stop_timeout.attr,
1852         &dev_attr_start_triggers.attr,
1853         NULL,
1854 };
1855
1856 static const struct attribute_group kbd_led_group = {
1857         .attrs = kbd_led_attrs,
1858 };
1859
1860 static struct attribute *kbd_led_als_attrs[] = {
1861         &dev_attr_als_enabled.attr,
1862         &dev_attr_als_setting.attr,
1863         NULL,
1864 };
1865
1866 static const struct attribute_group kbd_led_als_group = {
1867         .attrs = kbd_led_als_attrs,
1868 };
1869
1870 static const struct attribute_group *kbd_led_groups[] = {
1871         &kbd_led_group,
1872         &kbd_led_als_group,
1873         NULL,
1874 };
1875
1876 static enum led_brightness kbd_led_level_get(struct led_classdev *led_cdev)
1877 {
1878         int ret;
1879         u16 num;
1880         struct kbd_state state;
1881
1882         if (kbd_get_max_level()) {
1883                 ret = kbd_get_state(&state);
1884                 if (ret)
1885                         return 0;
1886                 ret = kbd_get_level(&state);
1887                 if (ret < 0)
1888                         return 0;
1889                 return ret;
1890         }
1891
1892         if (kbd_get_valid_token_counts()) {
1893                 ret = kbd_get_first_active_token_bit();
1894                 if (ret < 0)
1895                         return 0;
1896                 for (num = kbd_token_bits; num != 0 && ret > 0; --ret)
1897                         num &= num - 1; /* clear the first bit set */
1898                 if (num == 0)
1899                         return 0;
1900                 return ffs(num) - 1;
1901         }
1902
1903         pr_warn("Keyboard brightness level control not supported\n");
1904         return 0;
1905 }
1906
1907 static void kbd_led_level_set(struct led_classdev *led_cdev,
1908                               enum led_brightness value)
1909 {
1910         struct kbd_state state;
1911         struct kbd_state new_state;
1912         u16 num;
1913
1914         if (kbd_get_max_level()) {
1915                 if (kbd_get_state(&state))
1916                         return;
1917                 new_state = state;
1918                 if (kbd_set_level(&new_state, value))
1919                         return;
1920                 kbd_set_state_safe(&new_state, &state);
1921                 return;
1922         }
1923
1924         if (kbd_get_valid_token_counts()) {
1925                 for (num = kbd_token_bits; num != 0 && value > 0; --value)
1926                         num &= num - 1; /* clear the first bit set */
1927                 if (num == 0)
1928                         return;
1929                 kbd_set_token_bit(ffs(num) - 1);
1930                 return;
1931         }
1932
1933         pr_warn("Keyboard brightness level control not supported\n");
1934 }
1935
1936 static struct led_classdev kbd_led = {
1937         .name           = "dell::kbd_backlight",
1938         .brightness_set = kbd_led_level_set,
1939         .brightness_get = kbd_led_level_get,
1940         .groups         = kbd_led_groups,
1941 };
1942
1943 static int __init kbd_led_init(struct device *dev)
1944 {
1945         kbd_init();
1946         if (!kbd_led_present)
1947                 return -ENODEV;
1948         if (!kbd_als_supported)
1949                 kbd_led_groups[1] = NULL;
1950         kbd_led.max_brightness = kbd_get_max_level();
1951         if (!kbd_led.max_brightness) {
1952                 kbd_led.max_brightness = kbd_get_valid_token_counts();
1953                 if (kbd_led.max_brightness)
1954                         kbd_led.max_brightness--;
1955         }
1956         return led_classdev_register(dev, &kbd_led);
1957 }
1958
1959 static void brightness_set_exit(struct led_classdev *led_cdev,
1960                                 enum led_brightness value)
1961 {
1962         /* Don't change backlight level on exit */
1963 };
1964
1965 static void kbd_led_exit(void)
1966 {
1967         if (!kbd_led_present)
1968                 return;
1969         kbd_led.brightness_set = brightness_set_exit;
1970         led_classdev_unregister(&kbd_led);
1971 }
1972
1973 static int __init dell_init(void)
1974 {
1975         int max_intensity = 0;
1976         int token;
1977         int ret;
1978
1979         if (!dmi_check_system(dell_device_table))
1980                 return -ENODEV;
1981
1982         quirks = NULL;
1983         /* find if this machine support other functions */
1984         dmi_check_system(dell_quirks);
1985
1986         ret = platform_driver_register(&platform_driver);
1987         if (ret)
1988                 goto fail_platform_driver;
1989         platform_device = platform_device_alloc("dell-laptop", -1);
1990         if (!platform_device) {
1991                 ret = -ENOMEM;
1992                 goto fail_platform_device1;
1993         }
1994         ret = platform_device_add(platform_device);
1995         if (ret)
1996                 goto fail_platform_device2;
1997
1998         ret = dell_setup_rfkill();
1999
2000         if (ret) {
2001                 pr_warn("Unable to setup rfkill\n");
2002                 goto fail_rfkill;
2003         }
2004
2005         if (quirks && quirks->touchpad_led)
2006                 touchpad_led_init(&platform_device->dev);
2007
2008         kbd_led_init(&platform_device->dev);
2009
2010         dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
2011         if (dell_laptop_dir != NULL)
2012                 debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
2013                                     &dell_debugfs_fops);
2014
2015         if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
2016                 return 0;
2017
2018         token = find_token_location(BRIGHTNESS_TOKEN);
2019         if (token != -1) {
2020                 dell_smbios_get_buffer();
2021                 buffer->input[0] = token;
2022                 dell_send_request(buffer, 0, 2);
2023                 if (buffer->output[0] == 0)
2024                         max_intensity = buffer->output[3];
2025                 dell_smbios_release_buffer();
2026         }
2027
2028         if (max_intensity) {
2029                 struct backlight_properties props;
2030                 memset(&props, 0, sizeof(struct backlight_properties));
2031                 props.type = BACKLIGHT_PLATFORM;
2032                 props.max_brightness = max_intensity;
2033                 dell_backlight_device = backlight_device_register("dell_backlight",
2034                                                                   &platform_device->dev,
2035                                                                   NULL,
2036                                                                   &dell_ops,
2037                                                                   &props);
2038
2039                 if (IS_ERR(dell_backlight_device)) {
2040                         ret = PTR_ERR(dell_backlight_device);
2041                         dell_backlight_device = NULL;
2042                         goto fail_backlight;
2043                 }
2044
2045                 dell_backlight_device->props.brightness =
2046                         dell_get_intensity(dell_backlight_device);
2047                 backlight_update_status(dell_backlight_device);
2048         }
2049
2050         return 0;
2051
2052 fail_backlight:
2053         dell_cleanup_rfkill();
2054 fail_rfkill:
2055         platform_device_del(platform_device);
2056 fail_platform_device2:
2057         platform_device_put(platform_device);
2058 fail_platform_device1:
2059         platform_driver_unregister(&platform_driver);
2060 fail_platform_driver:
2061         return ret;
2062 }
2063
2064 static void __exit dell_exit(void)
2065 {
2066         debugfs_remove_recursive(dell_laptop_dir);
2067         if (quirks && quirks->touchpad_led)
2068                 touchpad_led_exit();
2069         kbd_led_exit();
2070         backlight_device_unregister(dell_backlight_device);
2071         dell_cleanup_rfkill();
2072         if (platform_device) {
2073                 platform_device_unregister(platform_device);
2074                 platform_driver_unregister(&platform_driver);
2075         }
2076 }
2077
2078 /* dell-rbtn.c driver export functions which will not work correctly (and could
2079  * cause kernel crash) if they are called before dell-rbtn.c init code. This is
2080  * not problem when dell-rbtn.c is compiled as external module. When both files
2081  * (dell-rbtn.c and dell-laptop.c) are compiled statically into kernel, then we
2082  * need to ensure that dell_init() will be called after initializing dell-rbtn.
2083  * This can be achieved by late_initcall() instead module_init().
2084  */
2085 late_initcall(dell_init);
2086 module_exit(dell_exit);
2087
2088 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
2089 MODULE_AUTHOR("Gabriele Mazzotta <gabriele.mzt@gmail.com>");
2090 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
2091 MODULE_DESCRIPTION("Dell laptop driver");
2092 MODULE_LICENSE("GPL");