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/dell-led.h>
  33 #include <linux/seq_file.h>
  34 #include <acpi/video.h>
  35 #include "dell-rbtn.h"
  36 #include "dell-smbios.h"
  37
  38 struct quirk_entry {
  39         u8 touchpad_led;
  40
  41         int needs_kbd_timeouts;
  42         /*
  43          * Ordered list of timeouts expressed in seconds.
  44          * The list must end with -1
  45          */
  46         int kbd_timeouts[];
  47 };
  48
  49 static struct quirk_entry *quirks;
  50
  51 static struct quirk_entry quirk_dell_vostro_v130 = {
  52         .touchpad_led = 1,
  53 };
  54
  55 static int __init dmi_matched(const struct dmi_system_id *dmi)
  56 {
  57         quirks = dmi->driver_data;
  58         return 1;
  59 }
  60
  61 /*
  62  * These values come from Windows utility provided by Dell. If any other value
  63  * is used then BIOS silently set timeout to 0 without any error message.
  64  */
  65 static struct quirk_entry quirk_dell_xps13_9333 = {
  66         .needs_kbd_timeouts = 1,
  67         .kbd_timeouts = { 0, 5, 15, 60, 5 * 60, 15 * 60, -1 },
  68 };
  69
  70 static struct platform_driver platform_driver = {
  71         .driver = {
  72                 .name = "dell-laptop",
  73         }
  74 };
  75
  76 static struct calling_interface_buffer *buffer;
  77 static struct platform_device *platform_device;
  78 static struct backlight_device *dell_backlight_device;
  79 static struct rfkill *wifi_rfkill;
  80 static struct rfkill *bluetooth_rfkill;
  81 static struct rfkill *wwan_rfkill;
  82 static bool force_rfkill;
  83
  84 module_param(force_rfkill, bool, 0444);
  85 MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
  86
  87 static const struct dmi_system_id dell_device_table[] __initconst = {
  88         {
  89                 .ident = "Dell laptop",
  90                 .matches = {
  91                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
  92                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
  93                 },
  94         },
  95         {
  96                 .matches = {
  97                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
  98                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
  99                 },
 100         },
 101         {
 102                 .matches = {
 103                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 104                         DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /*Notebook*/
 105                 },
 106         },
 107         {
 108                 .ident = "Dell Computer Corporation",
 109                 .matches = {
 110                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 111                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 112                 },
 113         },
 114         { }
 115 };
 116 MODULE_DEVICE_TABLE(dmi, dell_device_table);
 117
 118 static const struct dmi_system_id dell_quirks[] __initconst = {
 119         {
 120                 .callback = dmi_matched,
 121                 .ident = "Dell Vostro V130",
 122                 .matches = {
 123                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 124                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
 125                 },
 126                 .driver_data = &quirk_dell_vostro_v130,
 127         },
 128         {
 129                 .callback = dmi_matched,
 130                 .ident = "Dell Vostro V131",
 131                 .matches = {
 132                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 133                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 134                 },
 135                 .driver_data = &quirk_dell_vostro_v130,
 136         },
 137         {
 138                 .callback = dmi_matched,
 139                 .ident = "Dell Vostro 3350",
 140                 .matches = {
 141                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 142                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
 143                 },
 144                 .driver_data = &quirk_dell_vostro_v130,
 145         },
 146         {
 147                 .callback = dmi_matched,
 148                 .ident = "Dell Vostro 3555",
 149                 .matches = {
 150                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 151                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
 152                 },
 153                 .driver_data = &quirk_dell_vostro_v130,
 154         },
 155         {
 156                 .callback = dmi_matched,
 157                 .ident = "Dell Inspiron N311z",
 158                 .matches = {
 159                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 160                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
 161                 },
 162                 .driver_data = &quirk_dell_vostro_v130,
 163         },
 164         {
 165                 .callback = dmi_matched,
 166                 .ident = "Dell Inspiron M5110",
 167                 .matches = {
 168                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 169                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
 170                 },
 171                 .driver_data = &quirk_dell_vostro_v130,
 172         },
 173         {
 174                 .callback = dmi_matched,
 175                 .ident = "Dell Vostro 3360",
 176                 .matches = {
 177                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 178                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
 179                 },
 180                 .driver_data = &quirk_dell_vostro_v130,
 181         },
 182         {
 183                 .callback = dmi_matched,
 184                 .ident = "Dell Vostro 3460",
 185                 .matches = {
 186                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 187                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"),
 188                 },
 189                 .driver_data = &quirk_dell_vostro_v130,
 190         },
 191         {
 192                 .callback = dmi_matched,
 193                 .ident = "Dell Vostro 3560",
 194                 .matches = {
 195                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 196                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"),
 197                 },
 198                 .driver_data = &quirk_dell_vostro_v130,
 199         },
 200         {
 201                 .callback = dmi_matched,
 202                 .ident = "Dell Vostro 3450",
 203                 .matches = {
 204                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 205                         DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"),
 206                 },
 207                 .driver_data = &quirk_dell_vostro_v130,
 208         },
 209         {
 210                 .callback = dmi_matched,
 211                 .ident = "Dell Inspiron 5420",
 212                 .matches = {
 213                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 214                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"),
 215                 },
 216                 .driver_data = &quirk_dell_vostro_v130,
 217         },
 218         {
 219                 .callback = dmi_matched,
 220                 .ident = "Dell Inspiron 5520",
 221                 .matches = {
 222                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 223                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"),
 224                 },
 225                 .driver_data = &quirk_dell_vostro_v130,
 226         },
 227         {
 228                 .callback = dmi_matched,
 229                 .ident = "Dell Inspiron 5720",
 230                 .matches = {
 231                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 232                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"),
 233                 },
 234                 .driver_data = &quirk_dell_vostro_v130,
 235         },
 236         {
 237                 .callback = dmi_matched,
 238                 .ident = "Dell Inspiron 7420",
 239                 .matches = {
 240                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 241                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"),
 242                 },
 243                 .driver_data = &quirk_dell_vostro_v130,
 244         },
 245         {
 246                 .callback = dmi_matched,
 247                 .ident = "Dell Inspiron 7520",
 248                 .matches = {
 249                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 250                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
 251                 },
 252                 .driver_data = &quirk_dell_vostro_v130,
 253         },
 254         {
 255                 .callback = dmi_matched,
 256                 .ident = "Dell Inspiron 7720",
 257                 .matches = {
 258                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 259                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
 260                 },
 261                 .driver_data = &quirk_dell_vostro_v130,
 262         },
 263         {
 264                 .callback = dmi_matched,
 265                 .ident = "Dell XPS13 9333",
 266                 .matches = {
 267                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 268                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
 269                 },
 270                 .driver_data = &quirk_dell_xps13_9333,
 271         },
 272         { }
 273 };
 274
 275 void dell_set_arguments(u32 arg0, u32 arg1, u32 arg2, u32 arg3)
 276 {
 277         memset(buffer, 0, sizeof(struct calling_interface_buffer));
 278         buffer->input[0] = arg0;
 279         buffer->input[1] = arg1;
 280         buffer->input[2] = arg2;
 281         buffer->input[3] = arg3;
 282 }
 283
 284 int dell_send_request(u16 class, u16 select)
 285 {
 286         int ret;
 287
 288         buffer->cmd_class = class;
 289         buffer->cmd_select = select;
 290         ret = dell_smbios_call(buffer);
 291         if (ret != 0)
 292                 return ret;
 293         return dell_smbios_error(buffer->output[0]);
 294 }
 295
 296 /*
 297  * Derived from information in smbios-wireless-ctl:
 298  *
 299  * cbSelect 17, Value 11
 300  *
 301  * Return Wireless Info
 302  * cbArg1, byte0 = 0x00
 303  *
 304  *     cbRes1 Standard return codes (0, -1, -2)
 305  *     cbRes2 Info bit flags:
 306  *
 307  *     0 Hardware switch supported (1)
 308  *     1 WiFi locator supported (1)
 309  *     2 WLAN supported (1)
 310  *     3 Bluetooth (BT) supported (1)
 311  *     4 WWAN supported (1)
 312  *     5 Wireless KBD supported (1)
 313  *     6 Uw b supported (1)
 314  *     7 WiGig supported (1)
 315  *     8 WLAN installed (1)
 316  *     9 BT installed (1)
 317  *     10 WWAN installed (1)
 318  *     11 Uw b installed (1)
 319  *     12 WiGig installed (1)
 320  *     13-15 Reserved (0)
 321  *     16 Hardware (HW) switch is On (1)
 322  *     17 WLAN disabled (1)
 323  *     18 BT disabled (1)
 324  *     19 WWAN disabled (1)
 325  *     20 Uw b disabled (1)
 326  *     21 WiGig disabled (1)
 327  *     20-31 Reserved (0)
 328  *
 329  *     cbRes3 NVRAM size in bytes
 330  *     cbRes4, byte 0 NVRAM format version number
 331  *
 332  *
 333  * Set QuickSet Radio Disable Flag
 334  *     cbArg1, byte0 = 0x01
 335  *     cbArg1, byte1
 336  *     Radio ID     value:
 337  *     0        Radio Status
 338  *     1        WLAN ID
 339  *     2        BT ID
 340  *     3        WWAN ID
 341  *     4        UWB ID
 342  *     5        WIGIG ID
 343  *     cbArg1, byte2    Flag bits:
 344  *             0 QuickSet disables radio (1)
 345  *             1-7 Reserved (0)
 346  *
 347  *     cbRes1    Standard return codes (0, -1, -2)
 348  *     cbRes2    QuickSet (QS) radio disable bit map:
 349  *     0 QS disables WLAN
 350  *     1 QS disables BT
 351  *     2 QS disables WWAN
 352  *     3 QS disables UWB
 353  *     4 QS disables WIGIG
 354  *     5-31 Reserved (0)
 355  *
 356  * Wireless Switch Configuration
 357  *     cbArg1, byte0 = 0x02
 358  *
 359  *     cbArg1, byte1
 360  *     Subcommand:
 361  *     0 Get config
 362  *     1 Set config
 363  *     2 Set WiFi locator enable/disable
 364  *     cbArg1,byte2
 365  *     Switch settings (if byte 1==1):
 366  *     0 WLAN sw itch control (1)
 367  *     1 BT sw itch control (1)
 368  *     2 WWAN sw itch control (1)
 369  *     3 UWB sw itch control (1)
 370  *     4 WiGig sw itch control (1)
 371  *     5-7 Reserved (0)
 372  *    cbArg1, byte2 Enable bits (if byte 1==2):
 373  *     0 Enable WiFi locator (1)
 374  *
 375  *    cbRes1     Standard return codes (0, -1, -2)
 376  *    cbRes2 QuickSet radio disable bit map:
 377  *     0 WLAN controlled by sw itch (1)
 378  *     1 BT controlled by sw itch (1)
 379  *     2 WWAN controlled by sw itch (1)
 380  *     3 UWB controlled by sw itch (1)
 381  *     4 WiGig controlled by sw itch (1)
 382  *     5-6 Reserved (0)
 383  *     7 Wireless sw itch config locked (1)
 384  *     8 WiFi locator enabled (1)
 385  *     9-14 Reserved (0)
 386  *     15 WiFi locator setting locked (1)
 387  *     16-31 Reserved (0)
 388  *
 389  * Read Local Config Data (LCD)
 390  *     cbArg1, byte0 = 0x10
 391  *     cbArg1, byte1 NVRAM index low byte
 392  *     cbArg1, byte2 NVRAM index high byte
 393  *     cbRes1 Standard return codes (0, -1, -2)
 394  *     cbRes2 4 bytes read from LCD[index]
 395  *     cbRes3 4 bytes read from LCD[index+4]
 396  *     cbRes4 4 bytes read from LCD[index+8]
 397  *
 398  * Write Local Config Data (LCD)
 399  *     cbArg1, byte0 = 0x11
 400  *     cbArg1, byte1 NVRAM index low byte
 401  *     cbArg1, byte2 NVRAM index high byte
 402  *     cbArg2 4 bytes to w rite at LCD[index]
 403  *     cbArg3 4 bytes to w rite at LCD[index+4]
 404  *     cbArg4 4 bytes to w rite at LCD[index+8]
 405  *     cbRes1 Standard return codes (0, -1, -2)
 406  *
 407  * Populate Local Config Data from NVRAM
 408  *     cbArg1, byte0 = 0x12
 409  *     cbRes1 Standard return codes (0, -1, -2)
 410  *
 411  * Commit Local Config Data to NVRAM
 412  *     cbArg1, byte0 = 0x13
 413  *     cbRes1 Standard return codes (0, -1, -2)
 414  */
 415
 416 static int dell_rfkill_set(void *data, bool blocked)
 417 {
 418         int disable = blocked ? 1 : 0;
 419         unsigned long radio = (unsigned long)data;
 420         int hwswitch_bit = (unsigned long)data - 1;
 421         int hwswitch;
 422         int status;
 423         int ret;
 424
 425         dell_set_arguments(0, 0, 0, 0);
 426         ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 427         if (ret)
 428                 return ret;
 429         status = buffer->output[1];
 430
 431         dell_set_arguments(0x2, 0, 0, 0);
 432         ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 433         if (ret)
 434                 return ret;
 435         hwswitch = buffer->output[1];
 436
 437         /* If the hardware switch controls this radio, and the hardware
 438            switch is disabled, always disable the radio */
 439         if (ret == 0 && (hwswitch & BIT(hwswitch_bit)) &&
 440             (status & BIT(0)) && !(status & BIT(16)))
 441                 disable = 1;
 442
 443         dell_set_arguments(1 | (radio<<8) | (disable << 16), 0, 0, 0);
 444         ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 445         return ret;
 446 }
 447
 448 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
 449                                         int status)
 450 {
 451         if (status & BIT(0)) {
 452                 /* Has hw-switch, sync sw_state to BIOS */
 453                 int block = rfkill_blocked(rfkill);
 454                 dell_set_arguments(1 | (radio << 8) | (block << 16), 0, 0, 0);
 455                 dell_send_request(CLASS_INFO, SELECT_RFKILL);
 456         } else {
 457                 /* No hw-switch, sync BIOS state to sw_state */
 458                 rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
 459         }
 460 }
 461
 462 static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
 463                                         int status, int hwswitch)
 464 {
 465         if (hwswitch & (BIT(radio - 1)))
 466                 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
 467 }
 468
 469 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 470 {
 471         int radio = ((unsigned long)data & 0xF);
 472         int hwswitch;
 473         int status;
 474         int ret;
 475
 476         dell_set_arguments(0, 0, 0, 0);
 477         ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 478         status = buffer->output[1];
 479
 480         if (ret != 0 || !(status & BIT(0))) {
 481                 return;
 482         }
 483
 484         dell_set_arguments(0, 0x2, 0, 0);
 485         ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 486         hwswitch = buffer->output[1];
 487
 488         if (ret != 0)
 489                 return;
 490
 491         dell_rfkill_update_hw_state(rfkill, radio, status, hwswitch);
 492 }
 493
 494 static const struct rfkill_ops dell_rfkill_ops = {
 495         .set_block = dell_rfkill_set,
 496         .query = dell_rfkill_query,
 497 };
 498
 499 static struct dentry *dell_laptop_dir;
 500
 501 static int dell_debugfs_show(struct seq_file *s, void *data)
 502 {
 503         int hwswitch_state;
 504         int hwswitch_ret;
 505         int status;
 506         int ret;
 507
 508         dell_set_arguments(0, 0, 0, 0);
 509         ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 510         if (ret)
 511                 return ret;
 512         status = buffer->output[1];
 513
 514         dell_set_arguments(0, 0x2, 0, 0);
 515         hwswitch_ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 516         if (hwswitch_ret)
 517                 return hwswitch_ret;
 518         hwswitch_state = buffer->output[1];
 519
 520         seq_printf(s, "return:\t%d\n", ret);
 521         seq_printf(s, "status:\t0x%X\n", status);
 522         seq_printf(s, "Bit 0 : Hardware switch supported:   %lu\n",
 523                    status & BIT(0));
 524         seq_printf(s, "Bit 1 : Wifi locator supported:      %lu\n",
 525                   (status & BIT(1)) >> 1);
 526         seq_printf(s, "Bit 2 : Wifi is supported:           %lu\n",
 527                   (status & BIT(2)) >> 2);
 528         seq_printf(s, "Bit 3 : Bluetooth is supported:      %lu\n",
 529                   (status & BIT(3)) >> 3);
 530         seq_printf(s, "Bit 4 : WWAN is supported:           %lu\n",
 531                   (status & BIT(4)) >> 4);
 532         seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
 533                   (status & BIT(5)) >> 5);
 534         seq_printf(s, "Bit 6 : UWB supported:               %lu\n",
 535                   (status & BIT(6)) >> 6);
 536         seq_printf(s, "Bit 7 : WiGig supported:             %lu\n",
 537                   (status & BIT(7)) >> 7);
 538         seq_printf(s, "Bit 8 : Wifi is installed:           %lu\n",
 539                   (status & BIT(8)) >> 8);
 540         seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
 541                   (status & BIT(9)) >> 9);
 542         seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
 543                   (status & BIT(10)) >> 10);
 544         seq_printf(s, "Bit 11: UWB installed:               %lu\n",
 545                   (status & BIT(11)) >> 11);
 546         seq_printf(s, "Bit 12: WiGig installed:             %lu\n",
 547                   (status & BIT(12)) >> 12);
 548
 549         seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
 550                   (status & BIT(16)) >> 16);
 551         seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
 552                   (status & BIT(17)) >> 17);
 553         seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
 554                   (status & BIT(18)) >> 18);
 555         seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
 556                   (status & BIT(19)) >> 19);
 557         seq_printf(s, "Bit 20: UWB is blocked:              %lu\n",
 558                   (status & BIT(20)) >> 20);
 559         seq_printf(s, "Bit 21: WiGig is blocked:            %lu\n",
 560                   (status & BIT(21)) >> 21);
 561
 562         seq_printf(s, "\nhwswitch_return:\t%d\n", hwswitch_ret);
 563         seq_printf(s, "hwswitch_state:\t0x%X\n", hwswitch_state);
 564         seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
 565                    hwswitch_state & BIT(0));
 566         seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
 567                    (hwswitch_state & BIT(1)) >> 1);
 568         seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
 569                    (hwswitch_state & BIT(2)) >> 2);
 570         seq_printf(s, "Bit 3 : UWB controlled by switch:       %lu\n",
 571                    (hwswitch_state & BIT(3)) >> 3);
 572         seq_printf(s, "Bit 4 : WiGig controlled by switch:     %lu\n",
 573                    (hwswitch_state & BIT(4)) >> 4);
 574         seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
 575                    (hwswitch_state & BIT(7)) >> 7);
 576         seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
 577                    (hwswitch_state & BIT(8)) >> 8);
 578         seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
 579                    (hwswitch_state & BIT(15)) >> 15);
 580
 581         return 0;
 582 }
 583
 584 static int dell_debugfs_open(struct inode *inode, struct file *file)
 585 {
 586         return single_open(file, dell_debugfs_show, inode->i_private);
 587 }
 588
 589 static const struct file_operations dell_debugfs_fops = {
 590         .owner = THIS_MODULE,
 591         .open = dell_debugfs_open,
 592         .read = seq_read,
 593         .llseek = seq_lseek,
 594         .release = single_release,
 595 };
 596
 597 static void dell_update_rfkill(struct work_struct *ignored)
 598 {
 599         int hwswitch = 0;
 600         int status;
 601         int ret;
 602
 603         dell_set_arguments(0, 0, 0, 0);
 604         ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 605         status = buffer->output[1];
 606
 607         if (ret != 0)
 608                 return;
 609
 610         dell_set_arguments(0, 0x2, 0, 0);
 611         ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 612
 613         if (ret == 0 && (status & BIT(0)))
 614                 hwswitch = buffer->output[1];
 615
 616         if (wifi_rfkill) {
 617                 dell_rfkill_update_hw_state(wifi_rfkill, 1, status, hwswitch);
 618                 dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
 619         }
 620         if (bluetooth_rfkill) {
 621                 dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status,
 622                                             hwswitch);
 623                 dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
 624         }
 625         if (wwan_rfkill) {
 626                 dell_rfkill_update_hw_state(wwan_rfkill, 3, status, hwswitch);
 627                 dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
 628         }
 629 }
 630 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
 631
 632 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
 633                               struct serio *port)
 634 {
 635         static bool extended;
 636
 637         if (str & I8042_STR_AUXDATA)
 638                 return false;
 639
 640         if (unlikely(data == 0xe0)) {
 641                 extended = true;
 642                 return false;
 643         } else if (unlikely(extended)) {
 644                 switch (data) {
 645                 case 0x8:
 646                         schedule_delayed_work(&dell_rfkill_work,
 647                                               round_jiffies_relative(HZ / 4));
 648                         break;
 649                 }
 650                 extended = false;
 651         }
 652
 653         return false;
 654 }
 655
 656 static int (*dell_rbtn_notifier_register_func)(struct notifier_block *);
 657 static int (*dell_rbtn_notifier_unregister_func)(struct notifier_block *);
 658
 659 static int dell_laptop_rbtn_notifier_call(struct notifier_block *nb,
 660                                           unsigned long action, void *data)
 661 {
 662         schedule_delayed_work(&dell_rfkill_work, 0);
 663         return NOTIFY_OK;
 664 }
 665
 666 static struct notifier_block dell_laptop_rbtn_notifier = {
 667         .notifier_call = dell_laptop_rbtn_notifier_call,
 668 };
 669
 670 static int __init dell_setup_rfkill(void)
 671 {
 672         int status, ret, whitelisted;
 673         const char *product;
 674
 675         /*
 676          * rfkill support causes trouble on various models, mostly Inspirons.
 677          * So we whitelist certain series, and don't support rfkill on others.
 678          */
 679         whitelisted = 0;
 680         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 681         if (product &&  (strncmp(product, "Latitude", 8) == 0 ||
 682                          strncmp(product, "Precision", 9) == 0))
 683                 whitelisted = 1;
 684         if (!force_rfkill && !whitelisted)
 685                 return 0;
 686
 687         dell_set_arguments(0, 0, 0, 0);
 688         ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 689         status = buffer->output[1];
 690
 691         /* dell wireless info smbios call is not supported */
 692         if (ret != 0)
 693                 return 0;
 694
 695         /* rfkill is only tested on laptops with a hwswitch */
 696         if (!(status & BIT(0)) && !force_rfkill)
 697                 return 0;
 698
 699         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 700                 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
 701                                            RFKILL_TYPE_WLAN,
 702                                            &dell_rfkill_ops, (void *) 1);
 703                 if (!wifi_rfkill) {
 704                         ret = -ENOMEM;
 705                         goto err_wifi;
 706                 }
 707                 ret = rfkill_register(wifi_rfkill);
 708                 if (ret)
 709                         goto err_wifi;
 710         }
 711
 712         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 713                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
 714                                                 &platform_device->dev,
 715                                                 RFKILL_TYPE_BLUETOOTH,
 716                                                 &dell_rfkill_ops, (void *) 2);
 717                 if (!bluetooth_rfkill) {
 718                         ret = -ENOMEM;
 719                         goto err_bluetooth;
 720                 }
 721                 ret = rfkill_register(bluetooth_rfkill);
 722                 if (ret)
 723                         goto err_bluetooth;
 724         }
 725
 726         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 727                 wwan_rfkill = rfkill_alloc("dell-wwan",
 728                                            &platform_device->dev,
 729                                            RFKILL_TYPE_WWAN,
 730                                            &dell_rfkill_ops, (void *) 3);
 731                 if (!wwan_rfkill) {
 732                         ret = -ENOMEM;
 733                         goto err_wwan;
 734                 }
 735                 ret = rfkill_register(wwan_rfkill);
 736                 if (ret)
 737                         goto err_wwan;
 738         }
 739
 740         /*
 741          * Dell Airplane Mode Switch driver (dell-rbtn) supports ACPI devices
 742          * which can receive events from HW slider switch.
 743          *
 744          * Dell SMBIOS on whitelisted models supports controlling radio devices
 745          * but does not support receiving HW button switch events. We can use
 746          * i8042 filter hook function to receive keyboard data and handle
 747          * keycode for HW button.
 748          *
 749          * So if it is possible we will use Dell Airplane Mode Switch ACPI
 750          * driver for receiving HW events and Dell SMBIOS for setting rfkill
 751          * states. If ACPI driver or device is not available we will fallback to
 752          * i8042 filter hook function.
 753          *
 754          * To prevent duplicate rfkill devices which control and do same thing,
 755          * dell-rbtn driver will automatically remove its own rfkill devices
 756          * once function dell_rbtn_notifier_register() is called.
 757          */
 758
 759         dell_rbtn_notifier_register_func =
 760                 symbol_request(dell_rbtn_notifier_register);
 761         if (dell_rbtn_notifier_register_func) {
 762                 dell_rbtn_notifier_unregister_func =
 763                         symbol_request(dell_rbtn_notifier_unregister);
 764                 if (!dell_rbtn_notifier_unregister_func) {
 765                         symbol_put(dell_rbtn_notifier_register);
 766                         dell_rbtn_notifier_register_func = NULL;
 767                 }
 768         }
 769
 770         if (dell_rbtn_notifier_register_func) {
 771                 ret = dell_rbtn_notifier_register_func(
 772                         &dell_laptop_rbtn_notifier);
 773                 symbol_put(dell_rbtn_notifier_register);
 774                 dell_rbtn_notifier_register_func = NULL;
 775                 if (ret != 0) {
 776                         symbol_put(dell_rbtn_notifier_unregister);
 777                         dell_rbtn_notifier_unregister_func = NULL;
 778                 }
 779         } else {
 780                 pr_info("Symbols from dell-rbtn acpi driver are not available\n");
 781                 ret = -ENODEV;
 782         }
 783
 784         if (ret == 0) {
 785                 pr_info("Using dell-rbtn acpi driver for receiving events\n");
 786         } else if (ret != -ENODEV) {
 787                 pr_warn("Unable to register dell rbtn notifier\n");
 788                 goto err_filter;
 789         } else {
 790                 ret = i8042_install_filter(dell_laptop_i8042_filter);
 791                 if (ret) {
 792                         pr_warn("Unable to install key filter\n");
 793                         goto err_filter;
 794                 }
 795                 pr_info("Using i8042 filter function for receiving events\n");
 796         }
 797
 798         return 0;
 799 err_filter:
 800         if (wwan_rfkill)
 801                 rfkill_unregister(wwan_rfkill);
 802 err_wwan:
 803         rfkill_destroy(wwan_rfkill);
 804         if (bluetooth_rfkill)
 805                 rfkill_unregister(bluetooth_rfkill);
 806 err_bluetooth:
 807         rfkill_destroy(bluetooth_rfkill);
 808         if (wifi_rfkill)
 809                 rfkill_unregister(wifi_rfkill);
 810 err_wifi:
 811         rfkill_destroy(wifi_rfkill);
 812
 813         return ret;
 814 }
 815
 816 static void dell_cleanup_rfkill(void)
 817 {
 818         if (dell_rbtn_notifier_unregister_func) {
 819                 dell_rbtn_notifier_unregister_func(&dell_laptop_rbtn_notifier);
 820                 symbol_put(dell_rbtn_notifier_unregister);
 821                 dell_rbtn_notifier_unregister_func = NULL;
 822         } else {
 823                 i8042_remove_filter(dell_laptop_i8042_filter);
 824         }
 825         cancel_delayed_work_sync(&dell_rfkill_work);
 826         if (wifi_rfkill) {
 827                 rfkill_unregister(wifi_rfkill);
 828                 rfkill_destroy(wifi_rfkill);
 829         }
 830         if (bluetooth_rfkill) {
 831                 rfkill_unregister(bluetooth_rfkill);
 832                 rfkill_destroy(bluetooth_rfkill);
 833         }
 834         if (wwan_rfkill) {
 835                 rfkill_unregister(wwan_rfkill);
 836                 rfkill_destroy(wwan_rfkill);
 837         }
 838 }
 839
 840 static int dell_send_intensity(struct backlight_device *bd)
 841 {
 842         struct calling_interface_token *token;
 843         int ret;
 844
 845         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
 846         if (!token)
 847                 return -ENODEV;
 848
 849         dell_set_arguments(token->location, bd->props.brightness, 0, 0);
 850         if (power_supply_is_system_supplied() > 0)
 851                 ret = dell_send_request(CLASS_TOKEN_WRITE, SELECT_TOKEN_AC);
 852         else
 853                 ret = dell_send_request(CLASS_TOKEN_WRITE, SELECT_TOKEN_BAT);
 854
 855         return ret;
 856 }
 857
 858 static int dell_get_intensity(struct backlight_device *bd)
 859 {
 860         struct calling_interface_token *token;
 861         int ret;
 862
 863         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
 864         if (!token)
 865                 return -ENODEV;
 866
 867         dell_set_arguments(token->location, 0, 0, 0);
 868         if (power_supply_is_system_supplied() > 0)
 869                 ret = dell_send_request(CLASS_TOKEN_READ, SELECT_TOKEN_AC);
 870         else
 871                 ret = dell_send_request(CLASS_TOKEN_READ, SELECT_TOKEN_BAT);
 872
 873         if (ret == 0)
 874                 ret = buffer->output[1];
 875         return ret;
 876 }
 877
 878 static const struct backlight_ops dell_ops = {
 879         .get_brightness = dell_get_intensity,
 880         .update_status  = dell_send_intensity,
 881 };
 882
 883 static void touchpad_led_on(void)
 884 {
 885         int command = 0x97;
 886         char data = 1;
 887         i8042_command(&data, command | 1 << 12);
 888 }
 889
 890 static void touchpad_led_off(void)
 891 {
 892         int command = 0x97;
 893         char data = 2;
 894         i8042_command(&data, command | 1 << 12);
 895 }
 896
 897 static void touchpad_led_set(struct led_classdev *led_cdev,
 898         enum led_brightness value)
 899 {
 900         if (value > 0)
 901                 touchpad_led_on();
 902         else
 903                 touchpad_led_off();
 904 }
 905
 906 static struct led_classdev touchpad_led = {
 907         .name = "dell-laptop::touchpad",
 908         .brightness_set = touchpad_led_set,
 909         .flags = LED_CORE_SUSPENDRESUME,
 910 };
 911
 912 static int __init touchpad_led_init(struct device *dev)
 913 {
 914         return led_classdev_register(dev, &touchpad_led);
 915 }
 916
 917 static void touchpad_led_exit(void)
 918 {
 919         led_classdev_unregister(&touchpad_led);
 920 }
 921
 922 /*
 923  * Derived from information in smbios-keyboard-ctl:
 924  *
 925  * cbClass 4
 926  * cbSelect 11
 927  * Keyboard illumination
 928  * cbArg1 determines the function to be performed
 929  *
 930  * cbArg1 0x0 = Get Feature Information
 931  *  cbRES1         Standard return codes (0, -1, -2)
 932  *  cbRES2, word0  Bitmap of user-selectable modes
 933  *     bit 0     Always off (All systems)
 934  *     bit 1     Always on (Travis ATG, Siberia)
 935  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
 936  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
 937  *     bit 4     Auto: Input-activity-based On; input-activity based Off
 938  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
 939  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
 940  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
 941  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
 942  *     bits 9-15 Reserved for future use
 943  *  cbRES2, byte2  Reserved for future use
 944  *  cbRES2, byte3  Keyboard illumination type
 945  *     0         Reserved
 946  *     1         Tasklight
 947  *     2         Backlight
 948  *     3-255     Reserved for future use
 949  *  cbRES3, byte0  Supported auto keyboard illumination trigger bitmap.
 950  *     bit 0     Any keystroke
 951  *     bit 1     Touchpad activity
 952  *     bit 2     Pointing stick
 953  *     bit 3     Any mouse
 954  *     bits 4-7  Reserved for future use
 955  *  cbRES3, byte1  Supported timeout unit bitmap
 956  *     bit 0     Seconds
 957  *     bit 1     Minutes
 958  *     bit 2     Hours
 959  *     bit 3     Days
 960  *     bits 4-7  Reserved for future use
 961  *  cbRES3, byte2  Number of keyboard light brightness levels
 962  *  cbRES4, byte0  Maximum acceptable seconds value (0 if seconds not supported).
 963  *  cbRES4, byte1  Maximum acceptable minutes value (0 if minutes not supported).
 964  *  cbRES4, byte2  Maximum acceptable hours value (0 if hours not supported).
 965  *  cbRES4, byte3  Maximum acceptable days value (0 if days not supported)
 966  *
 967  * cbArg1 0x1 = Get Current State
 968  *  cbRES1         Standard return codes (0, -1, -2)
 969  *  cbRES2, word0  Bitmap of current mode state
 970  *     bit 0     Always off (All systems)
 971  *     bit 1     Always on (Travis ATG, Siberia)
 972  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
 973  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
 974  *     bit 4     Auto: Input-activity-based On; input-activity based Off
 975  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
 976  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
 977  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
 978  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
 979  *     bits 9-15 Reserved for future use
 980  *     Note: Only One bit can be set
 981  *  cbRES2, byte2  Currently active auto keyboard illumination triggers.
 982  *     bit 0     Any keystroke
 983  *     bit 1     Touchpad activity
 984  *     bit 2     Pointing stick
 985  *     bit 3     Any mouse
 986  *     bits 4-7  Reserved for future use
 987  *  cbRES2, byte3  Current Timeout on battery
 988  *     bits 7:6  Timeout units indicator:
 989  *     00b       Seconds
 990  *     01b       Minutes
 991  *     10b       Hours
 992  *     11b       Days
 993  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
 994  *     NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte
 995  *     are set upon return from the [Get feature information] call.
 996  *  cbRES3, byte0  Current setting of ALS value that turns the light on or off.
 997  *  cbRES3, byte1  Current ALS reading
 998  *  cbRES3, byte2  Current keyboard light level.
 999  *  cbRES3, byte3  Current timeout on AC Power
1000  *     bits 7:6  Timeout units indicator:
1001  *     00b       Seconds
1002  *     01b       Minutes
1003  *     10b       Hours
1004  *     11b       Days
1005  *     Bits 5:0  Timeout value (0-63) in sec/min/hr/day
1006  *     NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte2
1007  *     are set upon return from the upon return from the [Get Feature information] call.
1008  *
1009  * cbArg1 0x2 = Set New State
1010  *  cbRES1         Standard return codes (0, -1, -2)
1011  *  cbArg2, word0  Bitmap of current mode state
1012  *     bit 0     Always off (All systems)
1013  *     bit 1     Always on (Travis ATG, Siberia)
1014  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1015  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1016  *     bit 4     Auto: Input-activity-based On; input-activity based Off
1017  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1018  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1019  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1020  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1021  *     bits 9-15 Reserved for future use
1022  *     Note: Only One bit can be set
1023  *  cbArg2, byte2  Desired auto keyboard illumination triggers. Must remain inactive to allow
1024  *                 keyboard to turn off automatically.
1025  *     bit 0     Any keystroke
1026  *     bit 1     Touchpad activity
1027  *     bit 2     Pointing stick
1028  *     bit 3     Any mouse
1029  *     bits 4-7  Reserved for future use
1030  *  cbArg2, byte3  Desired Timeout on battery
1031  *     bits 7:6  Timeout units indicator:
1032  *     00b       Seconds
1033  *     01b       Minutes
1034  *     10b       Hours
1035  *     11b       Days
1036  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1037  *  cbArg3, byte0  Desired setting of ALS value that turns the light on or off.
1038  *  cbArg3, byte2  Desired keyboard light level.
1039  *  cbArg3, byte3  Desired Timeout on AC power
1040  *     bits 7:6  Timeout units indicator:
1041  *     00b       Seconds
1042  *     01b       Minutes
1043  *     10b       Hours
1044  *     11b       Days
1045  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1046  */
1047
1048
1049 enum kbd_timeout_unit {
1050         KBD_TIMEOUT_SECONDS = 0,
1051         KBD_TIMEOUT_MINUTES,
1052         KBD_TIMEOUT_HOURS,
1053         KBD_TIMEOUT_DAYS,
1054 };
1055
1056 enum kbd_mode_bit {
1057         KBD_MODE_BIT_OFF = 0,
1058         KBD_MODE_BIT_ON,
1059         KBD_MODE_BIT_ALS,
1060         KBD_MODE_BIT_TRIGGER_ALS,
1061         KBD_MODE_BIT_TRIGGER,
1062         KBD_MODE_BIT_TRIGGER_25,
1063         KBD_MODE_BIT_TRIGGER_50,
1064         KBD_MODE_BIT_TRIGGER_75,
1065         KBD_MODE_BIT_TRIGGER_100,
1066 };
1067
1068 #define kbd_is_als_mode_bit(bit) \
1069         ((bit) == KBD_MODE_BIT_ALS || (bit) == KBD_MODE_BIT_TRIGGER_ALS)
1070 #define kbd_is_trigger_mode_bit(bit) \
1071         ((bit) >= KBD_MODE_BIT_TRIGGER_ALS && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1072 #define kbd_is_level_mode_bit(bit) \
1073         ((bit) >= KBD_MODE_BIT_TRIGGER_25 && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1074
1075 struct kbd_info {
1076         u16 modes;
1077         u8 type;
1078         u8 triggers;
1079         u8 levels;
1080         u8 seconds;
1081         u8 minutes;
1082         u8 hours;
1083         u8 days;
1084 };
1085
1086 struct kbd_state {
1087         u8 mode_bit;
1088         u8 triggers;
1089         u8 timeout_value;
1090         u8 timeout_unit;
1091         u8 timeout_value_ac;
1092         u8 timeout_unit_ac;
1093         u8 als_setting;
1094         u8 als_value;
1095         u8 level;
1096 };
1097
1098 static const int kbd_tokens[] = {
1099         KBD_LED_OFF_TOKEN,
1100         KBD_LED_AUTO_25_TOKEN,
1101         KBD_LED_AUTO_50_TOKEN,
1102         KBD_LED_AUTO_75_TOKEN,
1103         KBD_LED_AUTO_100_TOKEN,
1104         KBD_LED_ON_TOKEN,
1105 };
1106
1107 static u16 kbd_token_bits;
1108
1109 static struct kbd_info kbd_info;
1110 static bool kbd_als_supported;
1111 static bool kbd_triggers_supported;
1112 static bool kbd_timeout_ac_supported;
1113
1114 static u8 kbd_mode_levels[16];
1115 static int kbd_mode_levels_count;
1116
1117 static u8 kbd_previous_level;
1118 static u8 kbd_previous_mode_bit;
1119
1120 static bool kbd_led_present;
1121 static DEFINE_MUTEX(kbd_led_mutex);
1122
1123 /*
1124  * NOTE: there are three ways to set the keyboard backlight level.
1125  * First, via kbd_state.mode_bit (assigning KBD_MODE_BIT_TRIGGER_* value).
1126  * Second, via kbd_state.level (assigning numerical value <= kbd_info.levels).
1127  * Third, via SMBIOS tokens (KBD_LED_* in kbd_tokens)
1128  *
1129  * There are laptops which support only one of these methods. If we want to
1130  * support as many machines as possible we need to implement all three methods.
1131  * The first two methods use the kbd_state structure. The third uses SMBIOS
1132  * tokens. If kbd_info.levels == 0, the machine does not support setting the
1133  * keyboard backlight level via kbd_state.level.
1134  */
1135
1136 static int kbd_get_info(struct kbd_info *info)
1137 {
1138         u8 units;
1139         int ret;
1140
1141         dell_set_arguments(0, 0, 0, 0);
1142         ret = dell_send_request(CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1143         if (ret)
1144                 return ret;
1145
1146         info->modes = buffer->output[1] & 0xFFFF;
1147         info->type = (buffer->output[1] >> 24) & 0xFF;
1148         info->triggers = buffer->output[2] & 0xFF;
1149         units = (buffer->output[2] >> 8) & 0xFF;
1150         info->levels = (buffer->output[2] >> 16) & 0xFF;
1151
1152         if (units & BIT(0))
1153                 info->seconds = (buffer->output[3] >> 0) & 0xFF;
1154         if (units & BIT(1))
1155                 info->minutes = (buffer->output[3] >> 8) & 0xFF;
1156         if (units & BIT(2))
1157                 info->hours = (buffer->output[3] >> 16) & 0xFF;
1158         if (units & BIT(3))
1159                 info->days = (buffer->output[3] >> 24) & 0xFF;
1160
1161         return ret;
1162 }
1163
1164 static unsigned int kbd_get_max_level(void)
1165 {
1166         if (kbd_info.levels != 0)
1167                 return kbd_info.levels;
1168         if (kbd_mode_levels_count > 0)
1169                 return kbd_mode_levels_count - 1;
1170         return 0;
1171 }
1172
1173 static int kbd_get_level(struct kbd_state *state)
1174 {
1175         int i;
1176
1177         if (kbd_info.levels != 0)
1178                 return state->level;
1179
1180         if (kbd_mode_levels_count > 0) {
1181                 for (i = 0; i < kbd_mode_levels_count; ++i)
1182                         if (kbd_mode_levels[i] == state->mode_bit)
1183                                 return i;
1184                 return 0;
1185         }
1186
1187         return -EINVAL;
1188 }
1189
1190 static int kbd_set_level(struct kbd_state *state, u8 level)
1191 {
1192         if (kbd_info.levels != 0) {
1193                 if (level != 0)
1194                         kbd_previous_level = level;
1195                 if (state->level == level)
1196                         return 0;
1197                 state->level = level;
1198                 if (level != 0 && state->mode_bit == KBD_MODE_BIT_OFF)
1199                         state->mode_bit = kbd_previous_mode_bit;
1200                 else if (level == 0 && state->mode_bit != KBD_MODE_BIT_OFF) {
1201                         kbd_previous_mode_bit = state->mode_bit;
1202                         state->mode_bit = KBD_MODE_BIT_OFF;
1203                 }
1204                 return 0;
1205         }
1206
1207         if (kbd_mode_levels_count > 0 && level < kbd_mode_levels_count) {
1208                 if (level != 0)
1209                         kbd_previous_level = level;
1210                 state->mode_bit = kbd_mode_levels[level];
1211                 return 0;
1212         }
1213
1214         return -EINVAL;
1215 }
1216
1217 static int kbd_get_state(struct kbd_state *state)
1218 {
1219         int ret;
1220
1221         dell_set_arguments(0x1, 0, 0, 0);
1222         ret = dell_send_request(CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1223         if (ret)
1224                 return ret;
1225
1226         state->mode_bit = ffs(buffer->output[1] & 0xFFFF);
1227         if (state->mode_bit != 0)
1228                 state->mode_bit--;
1229
1230         state->triggers = (buffer->output[1] >> 16) & 0xFF;
1231         state->timeout_value = (buffer->output[1] >> 24) & 0x3F;
1232         state->timeout_unit = (buffer->output[1] >> 30) & 0x3;
1233         state->als_setting = buffer->output[2] & 0xFF;
1234         state->als_value = (buffer->output[2] >> 8) & 0xFF;
1235         state->level = (buffer->output[2] >> 16) & 0xFF;
1236         state->timeout_value_ac = (buffer->output[2] >> 24) & 0x3F;
1237         state->timeout_unit_ac = (buffer->output[2] >> 30) & 0x3;
1238
1239         return ret;
1240 }
1241
1242 static int kbd_set_state(struct kbd_state *state)
1243 {
1244         int ret;
1245         u32 input1;
1246         u32 input2;
1247
1248         input1 = BIT(state->mode_bit) & 0xFFFF;
1249         input1 |= (state->triggers & 0xFF) << 16;
1250         input1 |= (state->timeout_value & 0x3F) << 24;
1251         input1 |= (state->timeout_unit & 0x3) << 30;
1252         input2 = state->als_setting & 0xFF;
1253         input2 |= (state->level & 0xFF) << 16;
1254         input2 |= (state->timeout_value_ac & 0x3F) << 24;
1255         input2 |= (state->timeout_unit_ac & 0x3) << 30;
1256         dell_set_arguments(0x2, input1, input2, 0);
1257         ret = dell_send_request(CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1258
1259         return ret;
1260 }
1261
1262 static int kbd_set_state_safe(struct kbd_state *state, struct kbd_state *old)
1263 {
1264         int ret;
1265
1266         ret = kbd_set_state(state);
1267         if (ret == 0)
1268                 return 0;
1269
1270         /*
1271          * When setting the new state fails,try to restore the previous one.
1272          * This is needed on some machines where BIOS sets a default state when
1273          * setting a new state fails. This default state could be all off.
1274          */
1275
1276         if (kbd_set_state(old))
1277                 pr_err("Setting old previous keyboard state failed\n");
1278
1279         return ret;
1280 }
1281
1282 static int kbd_set_token_bit(u8 bit)
1283 {
1284         struct calling_interface_token *token;
1285         int ret;
1286
1287         if (bit >= ARRAY_SIZE(kbd_tokens))
1288                 return -EINVAL;
1289
1290         token = dell_smbios_find_token(kbd_tokens[bit]);
1291         if (!token)
1292                 return -EINVAL;
1293
1294         dell_set_arguments(token->location, token->value, 0, 0);
1295         ret = dell_send_request(CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
1296
1297         return ret;
1298 }
1299
1300 static int kbd_get_token_bit(u8 bit)
1301 {
1302         struct calling_interface_token *token;
1303         int ret;
1304         int val;
1305
1306         if (bit >= ARRAY_SIZE(kbd_tokens))
1307                 return -EINVAL;
1308
1309         token = dell_smbios_find_token(kbd_tokens[bit]);
1310         if (!token)
1311                 return -EINVAL;
1312
1313         dell_set_arguments(token->location, 0, 0, 0);
1314         ret = dell_send_request(CLASS_TOKEN_READ, SELECT_TOKEN_STD);
1315         val = buffer->output[1];
1316
1317         if (ret)
1318                 return ret;
1319
1320         return (val == token->value);
1321 }
1322
1323 static int kbd_get_first_active_token_bit(void)
1324 {
1325         int i;
1326         int ret;
1327
1328         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i) {
1329                 ret = kbd_get_token_bit(i);
1330                 if (ret == 1)
1331                         return i;
1332         }
1333
1334         return ret;
1335 }
1336
1337 static int kbd_get_valid_token_counts(void)
1338 {
1339         return hweight16(kbd_token_bits);
1340 }
1341
1342 static inline int kbd_init_info(void)
1343 {
1344         struct kbd_state state;
1345         int ret;
1346         int i;
1347
1348         ret = kbd_get_info(&kbd_info);
1349         if (ret)
1350                 return ret;
1351
1352         /* NOTE: Old models without KBD_LED_AC_TOKEN token supports only one
1353          *       timeout value which is shared for both battery and AC power
1354          *       settings. So do not try to set AC values on old models.
1355          */
1356         if (dell_smbios_find_token(KBD_LED_AC_TOKEN))
1357                 kbd_timeout_ac_supported = true;
1358
1359         kbd_get_state(&state);
1360
1361         /* NOTE: timeout value is stored in 6 bits so max value is 63 */
1362         if (kbd_info.seconds > 63)
1363                 kbd_info.seconds = 63;
1364         if (kbd_info.minutes > 63)
1365                 kbd_info.minutes = 63;
1366         if (kbd_info.hours > 63)
1367                 kbd_info.hours = 63;
1368         if (kbd_info.days > 63)
1369                 kbd_info.days = 63;
1370
1371         /* NOTE: On tested machines ON mode did not work and caused
1372          *       problems (turned backlight off) so do not use it
1373          */
1374         kbd_info.modes &= ~BIT(KBD_MODE_BIT_ON);
1375
1376         kbd_previous_level = kbd_get_level(&state);
1377         kbd_previous_mode_bit = state.mode_bit;
1378
1379         if (kbd_previous_level == 0 && kbd_get_max_level() != 0)
1380                 kbd_previous_level = 1;
1381
1382         if (kbd_previous_mode_bit == KBD_MODE_BIT_OFF) {
1383                 kbd_previous_mode_bit =
1384                         ffs(kbd_info.modes & ~BIT(KBD_MODE_BIT_OFF));
1385                 if (kbd_previous_mode_bit != 0)
1386                         kbd_previous_mode_bit--;
1387         }
1388
1389         if (kbd_info.modes & (BIT(KBD_MODE_BIT_ALS) |
1390                               BIT(KBD_MODE_BIT_TRIGGER_ALS)))
1391                 kbd_als_supported = true;
1392
1393         if (kbd_info.modes & (
1394             BIT(KBD_MODE_BIT_TRIGGER_ALS) | BIT(KBD_MODE_BIT_TRIGGER) |
1395             BIT(KBD_MODE_BIT_TRIGGER_25) | BIT(KBD_MODE_BIT_TRIGGER_50) |
1396             BIT(KBD_MODE_BIT_TRIGGER_75) | BIT(KBD_MODE_BIT_TRIGGER_100)
1397            ))
1398                 kbd_triggers_supported = true;
1399
1400         /* kbd_mode_levels[0] is reserved, see below */
1401         for (i = 0; i < 16; ++i)
1402                 if (kbd_is_level_mode_bit(i) && (BIT(i) & kbd_info.modes))
1403                         kbd_mode_levels[1 + kbd_mode_levels_count++] = i;
1404
1405         /*
1406          * Find the first supported mode and assign to kbd_mode_levels[0].
1407          * This should be 0 (off), but we cannot depend on the BIOS to
1408          * support 0.
1409          */
1410         if (kbd_mode_levels_count > 0) {
1411                 for (i = 0; i < 16; ++i) {
1412                         if (BIT(i) & kbd_info.modes) {
1413                                 kbd_mode_levels[0] = i;
1414                                 break;
1415                         }
1416                 }
1417                 kbd_mode_levels_count++;
1418         }
1419
1420         return 0;
1421
1422 }
1423
1424 static inline void kbd_init_tokens(void)
1425 {
1426         int i;
1427
1428         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i)
1429                 if (dell_smbios_find_token(kbd_tokens[i]))
1430                         kbd_token_bits |= BIT(i);
1431 }
1432
1433 static void kbd_init(void)
1434 {
1435         int ret;
1436
1437         ret = kbd_init_info();
1438         kbd_init_tokens();
1439
1440         /*
1441          * Only supports keyboard backlight when it has at least two modes.
1442          */
1443         if ((ret == 0 && (kbd_info.levels != 0 || kbd_mode_levels_count >= 2))
1444             || kbd_get_valid_token_counts() >= 2)
1445                 kbd_led_present = true;
1446 }
1447
1448 static ssize_t kbd_led_timeout_store(struct device *dev,
1449                                      struct device_attribute *attr,
1450                                      const char *buf, size_t count)
1451 {
1452         struct kbd_state new_state;
1453         struct kbd_state state;
1454         bool convert;
1455         int value;
1456         int ret;
1457         char ch;
1458         u8 unit;
1459         int i;
1460
1461         ret = sscanf(buf, "%d %c", &value, &ch);
1462         if (ret < 1)
1463                 return -EINVAL;
1464         else if (ret == 1)
1465                 ch = 's';
1466
1467         if (value < 0)
1468                 return -EINVAL;
1469
1470         convert = false;
1471
1472         switch (ch) {
1473         case 's':
1474                 if (value > kbd_info.seconds)
1475                         convert = true;
1476                 unit = KBD_TIMEOUT_SECONDS;
1477                 break;
1478         case 'm':
1479                 if (value > kbd_info.minutes)
1480                         convert = true;
1481                 unit = KBD_TIMEOUT_MINUTES;
1482                 break;
1483         case 'h':
1484                 if (value > kbd_info.hours)
1485                         convert = true;
1486                 unit = KBD_TIMEOUT_HOURS;
1487                 break;
1488         case 'd':
1489                 if (value > kbd_info.days)
1490                         convert = true;
1491                 unit = KBD_TIMEOUT_DAYS;
1492                 break;
1493         default:
1494                 return -EINVAL;
1495         }
1496
1497         if (quirks && quirks->needs_kbd_timeouts)
1498                 convert = true;
1499
1500         if (convert) {
1501                 /* Convert value from current units to seconds */
1502                 switch (unit) {
1503                 case KBD_TIMEOUT_DAYS:
1504                         value *= 24;
1505                 case KBD_TIMEOUT_HOURS:
1506                         value *= 60;
1507                 case KBD_TIMEOUT_MINUTES:
1508                         value *= 60;
1509                         unit = KBD_TIMEOUT_SECONDS;
1510                 }
1511
1512                 if (quirks && quirks->needs_kbd_timeouts) {
1513                         for (i = 0; quirks->kbd_timeouts[i] != -1; i++) {
1514                                 if (value <= quirks->kbd_timeouts[i]) {
1515                                         value = quirks->kbd_timeouts[i];
1516                                         break;
1517                                 }
1518                         }
1519                 }
1520
1521                 if (value <= kbd_info.seconds && kbd_info.seconds) {
1522                         unit = KBD_TIMEOUT_SECONDS;
1523                 } else if (value / 60 <= kbd_info.minutes && kbd_info.minutes) {
1524                         value /= 60;
1525                         unit = KBD_TIMEOUT_MINUTES;
1526                 } else if (value / (60 * 60) <= kbd_info.hours && kbd_info.hours) {
1527                         value /= (60 * 60);
1528                         unit = KBD_TIMEOUT_HOURS;
1529                 } else if (value / (60 * 60 * 24) <= kbd_info.days && kbd_info.days) {
1530                         value /= (60 * 60 * 24);
1531                         unit = KBD_TIMEOUT_DAYS;
1532                 } else {
1533                         return -EINVAL;
1534                 }
1535         }
1536
1537         mutex_lock(&kbd_led_mutex);
1538
1539         ret = kbd_get_state(&state);
1540         if (ret)
1541                 goto out;
1542
1543         new_state = state;
1544
1545         if (kbd_timeout_ac_supported && power_supply_is_system_supplied() > 0) {
1546                 new_state.timeout_value_ac = value;
1547                 new_state.timeout_unit_ac = unit;
1548         } else {
1549                 new_state.timeout_value = value;
1550                 new_state.timeout_unit = unit;
1551         }
1552
1553         ret = kbd_set_state_safe(&new_state, &state);
1554         if (ret)
1555                 goto out;
1556
1557         ret = count;
1558 out:
1559         mutex_unlock(&kbd_led_mutex);
1560         return ret;
1561 }
1562
1563 static ssize_t kbd_led_timeout_show(struct device *dev,
1564                                     struct device_attribute *attr, char *buf)
1565 {
1566         struct kbd_state state;
1567         int value;
1568         int ret;
1569         int len;
1570         u8 unit;
1571
1572         ret = kbd_get_state(&state);
1573         if (ret)
1574                 return ret;
1575
1576         if (kbd_timeout_ac_supported && power_supply_is_system_supplied() > 0) {
1577                 value = state.timeout_value_ac;
1578                 unit = state.timeout_unit_ac;
1579         } else {
1580                 value = state.timeout_value;
1581                 unit = state.timeout_unit;
1582         }
1583
1584         len = sprintf(buf, "%d", value);
1585
1586         switch (unit) {
1587         case KBD_TIMEOUT_SECONDS:
1588                 return len + sprintf(buf+len, "s\n");
1589         case KBD_TIMEOUT_MINUTES:
1590                 return len + sprintf(buf+len, "m\n");
1591         case KBD_TIMEOUT_HOURS:
1592                 return len + sprintf(buf+len, "h\n");
1593         case KBD_TIMEOUT_DAYS:
1594                 return len + sprintf(buf+len, "d\n");
1595         default:
1596                 return -EINVAL;
1597         }
1598
1599         return len;
1600 }
1601
1602 static DEVICE_ATTR(stop_timeout, S_IRUGO | S_IWUSR,
1603                    kbd_led_timeout_show, kbd_led_timeout_store);
1604
1605 static const char * const kbd_led_triggers[] = {
1606         "keyboard",
1607         "touchpad",
1608         /*"trackstick"*/ NULL, /* NOTE: trackstick is just alias for touchpad */
1609         "mouse",
1610 };
1611
1612 static ssize_t kbd_led_triggers_store(struct device *dev,
1613                                       struct device_attribute *attr,
1614                                       const char *buf, size_t count)
1615 {
1616         struct kbd_state new_state;
1617         struct kbd_state state;
1618         bool triggers_enabled = false;
1619         int trigger_bit = -1;
1620         char trigger[21];
1621         int i, ret;
1622
1623         ret = sscanf(buf, "%20s", trigger);
1624         if (ret != 1)
1625                 return -EINVAL;
1626
1627         if (trigger[0] != '+' && trigger[0] != '-')
1628                 return -EINVAL;
1629
1630         mutex_lock(&kbd_led_mutex);
1631
1632         ret = kbd_get_state(&state);
1633         if (ret)
1634                 goto out;
1635
1636         if (kbd_triggers_supported)
1637                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1638
1639         if (kbd_triggers_supported) {
1640                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1641                         if (!(kbd_info.triggers & BIT(i)))
1642                                 continue;
1643                         if (!kbd_led_triggers[i])
1644                                 continue;
1645                         if (strcmp(trigger+1, kbd_led_triggers[i]) != 0)
1646                                 continue;
1647                         if (trigger[0] == '+' &&
1648                             triggers_enabled && (state.triggers & BIT(i))) {
1649                                 ret = count;
1650                                 goto out;
1651                         }
1652                         if (trigger[0] == '-' &&
1653                             (!triggers_enabled || !(state.triggers & BIT(i)))) {
1654                                 ret = count;
1655                                 goto out;
1656                         }
1657                         trigger_bit = i;
1658                         break;
1659                 }
1660         }
1661
1662         if (trigger_bit == -1) {
1663                 ret = -EINVAL;
1664                 goto out;
1665         }
1666
1667         new_state = state;
1668         if (trigger[0] == '+')
1669                 new_state.triggers |= BIT(trigger_bit);
1670         else {
1671                 new_state.triggers &= ~BIT(trigger_bit);
1672                 /*
1673                  * NOTE: trackstick bit (2) must be disabled when
1674                  *       disabling touchpad bit (1), otherwise touchpad
1675                  *       bit (1) will not be disabled
1676                  */
1677                 if (trigger_bit == 1)
1678                         new_state.triggers &= ~BIT(2);
1679         }
1680         if ((kbd_info.triggers & new_state.triggers) !=
1681             new_state.triggers) {
1682                 ret = -EINVAL;
1683                 goto out;
1684         }
1685         if (new_state.triggers && !triggers_enabled) {
1686                 new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1687                 kbd_set_level(&new_state, kbd_previous_level);
1688         } else if (new_state.triggers == 0) {
1689                 kbd_set_level(&new_state, 0);
1690         }
1691         if (!(kbd_info.modes & BIT(new_state.mode_bit))) {
1692                 ret = -EINVAL;
1693                 goto out;
1694         }
1695         ret = kbd_set_state_safe(&new_state, &state);
1696         if (ret)
1697                 goto out;
1698         if (new_state.mode_bit != KBD_MODE_BIT_OFF)
1699                 kbd_previous_mode_bit = new_state.mode_bit;
1700         ret = count;
1701 out:
1702         mutex_unlock(&kbd_led_mutex);
1703         return ret;
1704 }
1705
1706 static ssize_t kbd_led_triggers_show(struct device *dev,
1707                                      struct device_attribute *attr, char *buf)
1708 {
1709         struct kbd_state state;
1710         bool triggers_enabled;
1711         int level, i, ret;
1712         int len = 0;
1713
1714         ret = kbd_get_state(&state);
1715         if (ret)
1716                 return ret;
1717
1718         len = 0;
1719
1720         if (kbd_triggers_supported) {
1721                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1722                 level = kbd_get_level(&state);
1723                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1724                         if (!(kbd_info.triggers & BIT(i)))
1725                                 continue;
1726                         if (!kbd_led_triggers[i])
1727                                 continue;
1728                         if ((triggers_enabled || level <= 0) &&
1729                             (state.triggers & BIT(i)))
1730                                 buf[len++] = '+';
1731                         else
1732                                 buf[len++] = '-';
1733                         len += sprintf(buf+len, "%s ", kbd_led_triggers[i]);
1734                 }
1735         }
1736
1737         if (len)
1738                 buf[len - 1] = '\n';
1739
1740         return len;
1741 }
1742
1743 static DEVICE_ATTR(start_triggers, S_IRUGO | S_IWUSR,
1744                    kbd_led_triggers_show, kbd_led_triggers_store);
1745
1746 static ssize_t kbd_led_als_enabled_store(struct device *dev,
1747                                          struct device_attribute *attr,
1748                                          const char *buf, size_t count)
1749 {
1750         struct kbd_state new_state;
1751         struct kbd_state state;
1752         bool triggers_enabled = false;
1753         int enable;
1754         int ret;
1755
1756         ret = kstrtoint(buf, 0, &enable);
1757         if (ret)
1758                 return ret;
1759
1760         mutex_lock(&kbd_led_mutex);
1761
1762         ret = kbd_get_state(&state);
1763         if (ret)
1764                 goto out;
1765
1766         if (enable == kbd_is_als_mode_bit(state.mode_bit)) {
1767                 ret = count;
1768                 goto out;
1769         }
1770
1771         new_state = state;
1772
1773         if (kbd_triggers_supported)
1774                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1775
1776         if (enable) {
1777                 if (triggers_enabled)
1778                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER_ALS;
1779                 else
1780                         new_state.mode_bit = KBD_MODE_BIT_ALS;
1781         } else {
1782                 if (triggers_enabled) {
1783                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1784                         kbd_set_level(&new_state, kbd_previous_level);
1785                 } else {
1786                         new_state.mode_bit = KBD_MODE_BIT_ON;
1787                 }
1788         }
1789         if (!(kbd_info.modes & BIT(new_state.mode_bit)))  {
1790                 ret = -EINVAL;
1791                 goto out;
1792         }
1793
1794         ret = kbd_set_state_safe(&new_state, &state);
1795         if (ret)
1796                 goto out;
1797         kbd_previous_mode_bit = new_state.mode_bit;
1798
1799         ret = count;
1800 out:
1801         mutex_unlock(&kbd_led_mutex);
1802         return ret;
1803 }
1804
1805 static ssize_t kbd_led_als_enabled_show(struct device *dev,
1806                                         struct device_attribute *attr,
1807                                         char *buf)
1808 {
1809         struct kbd_state state;
1810         bool enabled = false;
1811         int ret;
1812
1813         ret = kbd_get_state(&state);
1814         if (ret)
1815                 return ret;
1816         enabled = kbd_is_als_mode_bit(state.mode_bit);
1817
1818         return sprintf(buf, "%d\n", enabled ? 1 : 0);
1819 }
1820
1821 static DEVICE_ATTR(als_enabled, S_IRUGO | S_IWUSR,
1822                    kbd_led_als_enabled_show, kbd_led_als_enabled_store);
1823
1824 static ssize_t kbd_led_als_setting_store(struct device *dev,
1825                                          struct device_attribute *attr,
1826                                          const char *buf, size_t count)
1827 {
1828         struct kbd_state state;
1829         struct kbd_state new_state;
1830         u8 setting;
1831         int ret;
1832
1833         ret = kstrtou8(buf, 10, &setting);
1834         if (ret)
1835                 return ret;
1836
1837         mutex_lock(&kbd_led_mutex);
1838
1839         ret = kbd_get_state(&state);
1840         if (ret)
1841                 goto out;
1842
1843         new_state = state;
1844         new_state.als_setting = setting;
1845
1846         ret = kbd_set_state_safe(&new_state, &state);
1847         if (ret)
1848                 goto out;
1849
1850         ret = count;
1851 out:
1852         mutex_unlock(&kbd_led_mutex);
1853         return ret;
1854 }
1855
1856 static ssize_t kbd_led_als_setting_show(struct device *dev,
1857                                         struct device_attribute *attr,
1858                                         char *buf)
1859 {
1860         struct kbd_state state;
1861         int ret;
1862
1863         ret = kbd_get_state(&state);
1864         if (ret)
1865                 return ret;
1866
1867         return sprintf(buf, "%d\n", state.als_setting);
1868 }
1869
1870 static DEVICE_ATTR(als_setting, S_IRUGO | S_IWUSR,
1871                    kbd_led_als_setting_show, kbd_led_als_setting_store);
1872
1873 static struct attribute *kbd_led_attrs[] = {
1874         &dev_attr_stop_timeout.attr,
1875         &dev_attr_start_triggers.attr,
1876         NULL,
1877 };
1878
1879 static const struct attribute_group kbd_led_group = {
1880         .attrs = kbd_led_attrs,
1881 };
1882
1883 static struct attribute *kbd_led_als_attrs[] = {
1884         &dev_attr_als_enabled.attr,
1885         &dev_attr_als_setting.attr,
1886         NULL,
1887 };
1888
1889 static const struct attribute_group kbd_led_als_group = {
1890         .attrs = kbd_led_als_attrs,
1891 };
1892
1893 static const struct attribute_group *kbd_led_groups[] = {
1894         &kbd_led_group,
1895         &kbd_led_als_group,
1896         NULL,
1897 };
1898
1899 static enum led_brightness kbd_led_level_get(struct led_classdev *led_cdev)
1900 {
1901         int ret;
1902         u16 num;
1903         struct kbd_state state;
1904
1905         if (kbd_get_max_level()) {
1906                 ret = kbd_get_state(&state);
1907                 if (ret)
1908                         return 0;
1909                 ret = kbd_get_level(&state);
1910                 if (ret < 0)
1911                         return 0;
1912                 return ret;
1913         }
1914
1915         if (kbd_get_valid_token_counts()) {
1916                 ret = kbd_get_first_active_token_bit();
1917                 if (ret < 0)
1918                         return 0;
1919                 for (num = kbd_token_bits; num != 0 && ret > 0; --ret)
1920                         num &= num - 1; /* clear the first bit set */
1921                 if (num == 0)
1922                         return 0;
1923                 return ffs(num) - 1;
1924         }
1925
1926         pr_warn("Keyboard brightness level control not supported\n");
1927         return 0;
1928 }
1929
1930 static int kbd_led_level_set(struct led_classdev *led_cdev,
1931                              enum led_brightness value)
1932 {
1933         struct kbd_state state;
1934         struct kbd_state new_state;
1935         u16 num;
1936         int ret;
1937
1938         mutex_lock(&kbd_led_mutex);
1939
1940         if (kbd_get_max_level()) {
1941                 ret = kbd_get_state(&state);
1942                 if (ret)
1943                         goto out;
1944                 new_state = state;
1945                 ret = kbd_set_level(&new_state, value);
1946                 if (ret)
1947                         goto out;
1948                 ret = kbd_set_state_safe(&new_state, &state);
1949         } else if (kbd_get_valid_token_counts()) {
1950                 for (num = kbd_token_bits; num != 0 && value > 0; --value)
1951                         num &= num - 1; /* clear the first bit set */
1952                 if (num == 0)
1953                         ret = 0;
1954                 else
1955                         ret = kbd_set_token_bit(ffs(num) - 1);
1956         } else {
1957                 pr_warn("Keyboard brightness level control not supported\n");
1958                 ret = -ENXIO;
1959         }
1960
1961 out:
1962         mutex_unlock(&kbd_led_mutex);
1963         return ret;
1964 }
1965
1966 static struct led_classdev kbd_led = {
1967         .name           = "dell::kbd_backlight",
1968         .flags          = LED_BRIGHT_HW_CHANGED,
1969         .brightness_set_blocking = kbd_led_level_set,
1970         .brightness_get = kbd_led_level_get,
1971         .groups         = kbd_led_groups,
1972 };
1973
1974 static int __init kbd_led_init(struct device *dev)
1975 {
1976         int ret;
1977
1978         kbd_init();
1979         if (!kbd_led_present)
1980                 return -ENODEV;
1981         if (!kbd_als_supported)
1982                 kbd_led_groups[1] = NULL;
1983         kbd_led.max_brightness = kbd_get_max_level();
1984         if (!kbd_led.max_brightness) {
1985                 kbd_led.max_brightness = kbd_get_valid_token_counts();
1986                 if (kbd_led.max_brightness)
1987                         kbd_led.max_brightness--;
1988         }
1989         ret = led_classdev_register(dev, &kbd_led);
1990         if (ret)
1991                 kbd_led_present = false;
1992
1993         return ret;
1994 }
1995
1996 static void brightness_set_exit(struct led_classdev *led_cdev,
1997                                 enum led_brightness value)
1998 {
1999         /* Don't change backlight level on exit */
2000 };
2001
2002 static void kbd_led_exit(void)
2003 {
2004         if (!kbd_led_present)
2005                 return;
2006         kbd_led.brightness_set = brightness_set_exit;
2007         led_classdev_unregister(&kbd_led);
2008 }
2009
2010 static int dell_laptop_notifier_call(struct notifier_block *nb,
2011                                      unsigned long action, void *data)
2012 {
2013         switch (action) {
2014         case DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED:
2015                 if (!kbd_led_present)
2016                         break;
2017
2018                 led_classdev_notify_brightness_hw_changed(&kbd_led,
2019                                                 kbd_led_level_get(&kbd_led));
2020                 break;
2021         }
2022
2023         return NOTIFY_OK;
2024 }
2025
2026 static struct notifier_block dell_laptop_notifier = {
2027         .notifier_call = dell_laptop_notifier_call,
2028 };
2029
2030 int dell_micmute_led_set(int state)
2031 {
2032         struct calling_interface_token *token;
2033
2034         if (state == 0)
2035                 token = dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE);
2036         else if (state == 1)
2037                 token = dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE);
2038         else
2039                 return -EINVAL;
2040
2041         if (!token)
2042                 return -ENODEV;
2043
2044         dell_set_arguments(token->location, token->value, 0, 0);
2045         dell_send_request(CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
2046
2047         return state;
2048 }
2049 EXPORT_SYMBOL_GPL(dell_micmute_led_set);
2050
2051 static int __init dell_init(void)
2052 {
2053         struct calling_interface_token *token;
2054         int max_intensity = 0;
2055         int ret;
2056
2057         if (!dmi_check_system(dell_device_table))
2058                 return -ENODEV;
2059
2060         quirks = NULL;
2061         /* find if this machine support other functions */
2062         dmi_check_system(dell_quirks);
2063
2064         ret = platform_driver_register(&platform_driver);
2065         if (ret)
2066                 goto fail_platform_driver;
2067         platform_device = platform_device_alloc("dell-laptop", -1);
2068         if (!platform_device) {
2069                 ret = -ENOMEM;
2070                 goto fail_platform_device1;
2071         }
2072         ret = platform_device_add(platform_device);
2073         if (ret)
2074                 goto fail_platform_device2;
2075
2076         buffer = kzalloc(sizeof(struct calling_interface_buffer), GFP_KERNEL);
2077         if (!buffer) {
2078                 ret = -ENOMEM;
2079                 goto fail_buffer;
2080         }
2081
2082
2083         ret = dell_setup_rfkill();
2084
2085         if (ret) {
2086                 pr_warn("Unable to setup rfkill\n");
2087                 goto fail_rfkill;
2088         }
2089
2090         if (quirks && quirks->touchpad_led)
2091                 touchpad_led_init(&platform_device->dev);
2092
2093         kbd_led_init(&platform_device->dev);
2094
2095         dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
2096         if (dell_laptop_dir != NULL)
2097                 debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
2098                                     &dell_debugfs_fops);
2099
2100         dell_laptop_register_notifier(&dell_laptop_notifier);
2101
2102         if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
2103                 return 0;
2104
2105         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
2106         if (token) {
2107                 dell_set_arguments(token->location, 0, 0, 0);
2108                 ret = dell_send_request(CLASS_TOKEN_READ, SELECT_TOKEN_AC);
2109                 if (ret)
2110                         max_intensity = buffer->output[3];
2111         }
2112
2113         if (max_intensity) {
2114                 struct backlight_properties props;
2115                 memset(&props, 0, sizeof(struct backlight_properties));
2116                 props.type = BACKLIGHT_PLATFORM;
2117                 props.max_brightness = max_intensity;
2118                 dell_backlight_device = backlight_device_register("dell_backlight",
2119                                                                   &platform_device->dev,
2120                                                                   NULL,
2121                                                                   &dell_ops,
2122                                                                   &props);
2123
2124                 if (IS_ERR(dell_backlight_device)) {
2125                         ret = PTR_ERR(dell_backlight_device);
2126                         dell_backlight_device = NULL;
2127                         goto fail_backlight;
2128                 }
2129
2130                 dell_backlight_device->props.brightness =
2131                         dell_get_intensity(dell_backlight_device);
2132                 if (dell_backlight_device->props.brightness < 0) {
2133                         ret = dell_backlight_device->props.brightness;
2134                         goto fail_get_brightness;
2135                 }
2136                 backlight_update_status(dell_backlight_device);
2137         }
2138
2139         return 0;
2140
2141 fail_get_brightness:
2142         backlight_device_unregister(dell_backlight_device);
2143 fail_backlight:
2144         kfree(buffer);
2145 fail_buffer:
2146         dell_cleanup_rfkill();
2147 fail_rfkill:
2148         platform_device_del(platform_device);
2149 fail_platform_device2:
2150         platform_device_put(platform_device);
2151 fail_platform_device1:
2152         platform_driver_unregister(&platform_driver);
2153 fail_platform_driver:
2154         return ret;
2155 }
2156
2157 static void __exit dell_exit(void)
2158 {
2159         dell_laptop_unregister_notifier(&dell_laptop_notifier);
2160         debugfs_remove_recursive(dell_laptop_dir);
2161         if (quirks && quirks->touchpad_led)
2162                 touchpad_led_exit();
2163         kbd_led_exit();
2164         backlight_device_unregister(dell_backlight_device);
2165         kfree(buffer);
2166         dell_cleanup_rfkill();
2167         if (platform_device) {
2168                 platform_device_unregister(platform_device);
2169                 platform_driver_unregister(&platform_driver);
2170         }
2171 }
2172
2173 /* dell-rbtn.c driver export functions which will not work correctly (and could
2174  * cause kernel crash) if they are called before dell-rbtn.c init code. This is
2175  * not problem when dell-rbtn.c is compiled as external module. When both files
2176  * (dell-rbtn.c and dell-laptop.c) are compiled statically into kernel, then we
2177  * need to ensure that dell_init() will be called after initializing dell-rbtn.
2178  * This can be achieved by late_initcall() instead module_init().
2179  */
2180 late_initcall(dell_init);
2181 module_exit(dell_exit);
2182
2183 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
2184 MODULE_AUTHOR("Gabriele Mazzotta <gabriele.mzt@gmail.com>");
2185 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
2186 MODULE_DESCRIPTION("Dell laptop driver");
2187 MODULE_LICENSE("GPL");