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         u8 kbd_led_levels_off_1;
  41
  42         int needs_kbd_timeouts;
  43         /*
  44          * Ordered list of timeouts expressed in seconds.
  45          * The list must end with -1
  46          */
  47         int kbd_timeouts[];
  48 };
  49
  50 static struct quirk_entry *quirks;
  51
  52 static struct quirk_entry quirk_dell_vostro_v130 = {
  53         .touchpad_led = 1,
  54 };
  55
  56 static int __init dmi_matched(const struct dmi_system_id *dmi)
  57 {
  58         quirks = dmi->driver_data;
  59         return 1;
  60 }
  61
  62 /*
  63  * These values come from Windows utility provided by Dell. If any other value
  64  * is used then BIOS silently set timeout to 0 without any error message.
  65  */
  66 static struct quirk_entry quirk_dell_xps13_9333 = {
  67         .needs_kbd_timeouts = 1,
  68         .kbd_timeouts = { 0, 5, 15, 60, 5 * 60, 15 * 60, -1 },
  69 };
  70
  71 static struct quirk_entry quirk_dell_latitude_e6410 = {
  72         .kbd_led_levels_off_1 = 1,
  73 };
  74
  75 static struct platform_driver platform_driver = {
  76         .driver = {
  77                 .name = "dell-laptop",
  78         }
  79 };
  80
  81 static struct calling_interface_buffer *buffer;
  82 static struct platform_device *platform_device;
  83 static struct backlight_device *dell_backlight_device;
  84 static struct rfkill *wifi_rfkill;
  85 static struct rfkill *bluetooth_rfkill;
  86 static struct rfkill *wwan_rfkill;
  87 static bool force_rfkill;
  88
  89 module_param(force_rfkill, bool, 0444);
  90 MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
  91
  92 static const struct dmi_system_id dell_device_table[] __initconst = {
  93         {
  94                 .ident = "Dell laptop",
  95                 .matches = {
  96                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
  97                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
  98                 },
  99         },
 100         {
 101                 .matches = {
 102                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 103                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
 104                 },
 105         },
 106         {
 107                 .matches = {
 108                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 109                         DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /*Notebook*/
 110                 },
 111         },
 112         {
 113                 .ident = "Dell Computer Corporation",
 114                 .matches = {
 115                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 116                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 117                 },
 118         },
 119         { }
 120 };
 121 MODULE_DEVICE_TABLE(dmi, dell_device_table);
 122
 123 static const struct dmi_system_id dell_quirks[] __initconst = {
 124         {
 125                 .callback = dmi_matched,
 126                 .ident = "Dell Vostro V130",
 127                 .matches = {
 128                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 129                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
 130                 },
 131                 .driver_data = &quirk_dell_vostro_v130,
 132         },
 133         {
 134                 .callback = dmi_matched,
 135                 .ident = "Dell Vostro V131",
 136                 .matches = {
 137                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 138                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 139                 },
 140                 .driver_data = &quirk_dell_vostro_v130,
 141         },
 142         {
 143                 .callback = dmi_matched,
 144                 .ident = "Dell Vostro 3350",
 145                 .matches = {
 146                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 147                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
 148                 },
 149                 .driver_data = &quirk_dell_vostro_v130,
 150         },
 151         {
 152                 .callback = dmi_matched,
 153                 .ident = "Dell Vostro 3555",
 154                 .matches = {
 155                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 156                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
 157                 },
 158                 .driver_data = &quirk_dell_vostro_v130,
 159         },
 160         {
 161                 .callback = dmi_matched,
 162                 .ident = "Dell Inspiron N311z",
 163                 .matches = {
 164                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 165                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
 166                 },
 167                 .driver_data = &quirk_dell_vostro_v130,
 168         },
 169         {
 170                 .callback = dmi_matched,
 171                 .ident = "Dell Inspiron M5110",
 172                 .matches = {
 173                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 174                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
 175                 },
 176                 .driver_data = &quirk_dell_vostro_v130,
 177         },
 178         {
 179                 .callback = dmi_matched,
 180                 .ident = "Dell Vostro 3360",
 181                 .matches = {
 182                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 183                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
 184                 },
 185                 .driver_data = &quirk_dell_vostro_v130,
 186         },
 187         {
 188                 .callback = dmi_matched,
 189                 .ident = "Dell Vostro 3460",
 190                 .matches = {
 191                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 192                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"),
 193                 },
 194                 .driver_data = &quirk_dell_vostro_v130,
 195         },
 196         {
 197                 .callback = dmi_matched,
 198                 .ident = "Dell Vostro 3560",
 199                 .matches = {
 200                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 201                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"),
 202                 },
 203                 .driver_data = &quirk_dell_vostro_v130,
 204         },
 205         {
 206                 .callback = dmi_matched,
 207                 .ident = "Dell Vostro 3450",
 208                 .matches = {
 209                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 210                         DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"),
 211                 },
 212                 .driver_data = &quirk_dell_vostro_v130,
 213         },
 214         {
 215                 .callback = dmi_matched,
 216                 .ident = "Dell Inspiron 5420",
 217                 .matches = {
 218                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 219                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"),
 220                 },
 221                 .driver_data = &quirk_dell_vostro_v130,
 222         },
 223         {
 224                 .callback = dmi_matched,
 225                 .ident = "Dell Inspiron 5520",
 226                 .matches = {
 227                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 228                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"),
 229                 },
 230                 .driver_data = &quirk_dell_vostro_v130,
 231         },
 232         {
 233                 .callback = dmi_matched,
 234                 .ident = "Dell Inspiron 5720",
 235                 .matches = {
 236                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 237                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"),
 238                 },
 239                 .driver_data = &quirk_dell_vostro_v130,
 240         },
 241         {
 242                 .callback = dmi_matched,
 243                 .ident = "Dell Inspiron 7420",
 244                 .matches = {
 245                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 246                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"),
 247                 },
 248                 .driver_data = &quirk_dell_vostro_v130,
 249         },
 250         {
 251                 .callback = dmi_matched,
 252                 .ident = "Dell Inspiron 7520",
 253                 .matches = {
 254                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 255                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
 256                 },
 257                 .driver_data = &quirk_dell_vostro_v130,
 258         },
 259         {
 260                 .callback = dmi_matched,
 261                 .ident = "Dell Inspiron 7720",
 262                 .matches = {
 263                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 264                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
 265                 },
 266                 .driver_data = &quirk_dell_vostro_v130,
 267         },
 268         {
 269                 .callback = dmi_matched,
 270                 .ident = "Dell XPS13 9333",
 271                 .matches = {
 272                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 273                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
 274                 },
 275                 .driver_data = &quirk_dell_xps13_9333,
 276         },
 277         {
 278                 .callback = dmi_matched,
 279                 .ident = "Dell Latitude E6410",
 280                 .matches = {
 281                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 282                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6410"),
 283                 },
 284                 .driver_data = &quirk_dell_latitude_e6410,
 285         },
 286         { }
 287 };
 288
 289 void dell_set_arguments(u32 arg0, u32 arg1, u32 arg2, u32 arg3)
 290 {
 291         memset(buffer, 0, sizeof(struct calling_interface_buffer));
 292         buffer->input[0] = arg0;
 293         buffer->input[1] = arg1;
 294         buffer->input[2] = arg2;
 295         buffer->input[3] = arg3;
 296 }
 297
 298 int dell_send_request(u16 class, u16 select)
 299 {
 300         int ret;
 301
 302         buffer->cmd_class = class;
 303         buffer->cmd_select = select;
 304         ret = dell_smbios_call(buffer);
 305         if (ret != 0)
 306                 return ret;
 307         return dell_smbios_error(buffer->output[0]);
 308 }
 309
 310 /*
 311  * Derived from information in smbios-wireless-ctl:
 312  *
 313  * cbSelect 17, Value 11
 314  *
 315  * Return Wireless Info
 316  * cbArg1, byte0 = 0x00
 317  *
 318  *     cbRes1 Standard return codes (0, -1, -2)
 319  *     cbRes2 Info bit flags:
 320  *
 321  *     0 Hardware switch supported (1)
 322  *     1 WiFi locator supported (1)
 323  *     2 WLAN supported (1)
 324  *     3 Bluetooth (BT) supported (1)
 325  *     4 WWAN supported (1)
 326  *     5 Wireless KBD supported (1)
 327  *     6 Uw b supported (1)
 328  *     7 WiGig supported (1)
 329  *     8 WLAN installed (1)
 330  *     9 BT installed (1)
 331  *     10 WWAN installed (1)
 332  *     11 Uw b installed (1)
 333  *     12 WiGig installed (1)
 334  *     13-15 Reserved (0)
 335  *     16 Hardware (HW) switch is On (1)
 336  *     17 WLAN disabled (1)
 337  *     18 BT disabled (1)
 338  *     19 WWAN disabled (1)
 339  *     20 Uw b disabled (1)
 340  *     21 WiGig disabled (1)
 341  *     20-31 Reserved (0)
 342  *
 343  *     cbRes3 NVRAM size in bytes
 344  *     cbRes4, byte 0 NVRAM format version number
 345  *
 346  *
 347  * Set QuickSet Radio Disable Flag
 348  *     cbArg1, byte0 = 0x01
 349  *     cbArg1, byte1
 350  *     Radio ID     value:
 351  *     0        Radio Status
 352  *     1        WLAN ID
 353  *     2        BT ID
 354  *     3        WWAN ID
 355  *     4        UWB ID
 356  *     5        WIGIG ID
 357  *     cbArg1, byte2    Flag bits:
 358  *             0 QuickSet disables radio (1)
 359  *             1-7 Reserved (0)
 360  *
 361  *     cbRes1    Standard return codes (0, -1, -2)
 362  *     cbRes2    QuickSet (QS) radio disable bit map:
 363  *     0 QS disables WLAN
 364  *     1 QS disables BT
 365  *     2 QS disables WWAN
 366  *     3 QS disables UWB
 367  *     4 QS disables WIGIG
 368  *     5-31 Reserved (0)
 369  *
 370  * Wireless Switch Configuration
 371  *     cbArg1, byte0 = 0x02
 372  *
 373  *     cbArg1, byte1
 374  *     Subcommand:
 375  *     0 Get config
 376  *     1 Set config
 377  *     2 Set WiFi locator enable/disable
 378  *     cbArg1,byte2
 379  *     Switch settings (if byte 1==1):
 380  *     0 WLAN sw itch control (1)
 381  *     1 BT sw itch control (1)
 382  *     2 WWAN sw itch control (1)
 383  *     3 UWB sw itch control (1)
 384  *     4 WiGig sw itch control (1)
 385  *     5-7 Reserved (0)
 386  *    cbArg1, byte2 Enable bits (if byte 1==2):
 387  *     0 Enable WiFi locator (1)
 388  *
 389  *    cbRes1     Standard return codes (0, -1, -2)
 390  *    cbRes2 QuickSet radio disable bit map:
 391  *     0 WLAN controlled by sw itch (1)
 392  *     1 BT controlled by sw itch (1)
 393  *     2 WWAN controlled by sw itch (1)
 394  *     3 UWB controlled by sw itch (1)
 395  *     4 WiGig controlled by sw itch (1)
 396  *     5-6 Reserved (0)
 397  *     7 Wireless sw itch config locked (1)
 398  *     8 WiFi locator enabled (1)
 399  *     9-14 Reserved (0)
 400  *     15 WiFi locator setting locked (1)
 401  *     16-31 Reserved (0)
 402  *
 403  * Read Local Config Data (LCD)
 404  *     cbArg1, byte0 = 0x10
 405  *     cbArg1, byte1 NVRAM index low byte
 406  *     cbArg1, byte2 NVRAM index high byte
 407  *     cbRes1 Standard return codes (0, -1, -2)
 408  *     cbRes2 4 bytes read from LCD[index]
 409  *     cbRes3 4 bytes read from LCD[index+4]
 410  *     cbRes4 4 bytes read from LCD[index+8]
 411  *
 412  * Write Local Config Data (LCD)
 413  *     cbArg1, byte0 = 0x11
 414  *     cbArg1, byte1 NVRAM index low byte
 415  *     cbArg1, byte2 NVRAM index high byte
 416  *     cbArg2 4 bytes to w rite at LCD[index]
 417  *     cbArg3 4 bytes to w rite at LCD[index+4]
 418  *     cbArg4 4 bytes to w rite at LCD[index+8]
 419  *     cbRes1 Standard return codes (0, -1, -2)
 420  *
 421  * Populate Local Config Data from NVRAM
 422  *     cbArg1, byte0 = 0x12
 423  *     cbRes1 Standard return codes (0, -1, -2)
 424  *
 425  * Commit Local Config Data to NVRAM
 426  *     cbArg1, byte0 = 0x13
 427  *     cbRes1 Standard return codes (0, -1, -2)
 428  */
 429
 430 static int dell_rfkill_set(void *data, bool blocked)
 431 {
 432         int disable = blocked ? 1 : 0;
 433         unsigned long radio = (unsigned long)data;
 434         int hwswitch_bit = (unsigned long)data - 1;
 435         int hwswitch;
 436         int status;
 437         int ret;
 438
 439         dell_set_arguments(0, 0, 0, 0);
 440         ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 441         if (ret)
 442                 return ret;
 443         status = buffer->output[1];
 444
 445         dell_set_arguments(0x2, 0, 0, 0);
 446         ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 447         if (ret)
 448                 return ret;
 449         hwswitch = buffer->output[1];
 450
 451         /* If the hardware switch controls this radio, and the hardware
 452            switch is disabled, always disable the radio */
 453         if (ret == 0 && (hwswitch & BIT(hwswitch_bit)) &&
 454             (status & BIT(0)) && !(status & BIT(16)))
 455                 disable = 1;
 456
 457         dell_set_arguments(1 | (radio<<8) | (disable << 16), 0, 0, 0);
 458         ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 459         return ret;
 460 }
 461
 462 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
 463                                         int status)
 464 {
 465         if (status & BIT(0)) {
 466                 /* Has hw-switch, sync sw_state to BIOS */
 467                 int block = rfkill_blocked(rfkill);
 468                 dell_set_arguments(1 | (radio << 8) | (block << 16), 0, 0, 0);
 469                 dell_send_request(CLASS_INFO, SELECT_RFKILL);
 470         } else {
 471                 /* No hw-switch, sync BIOS state to sw_state */
 472                 rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
 473         }
 474 }
 475
 476 static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
 477                                         int status, int hwswitch)
 478 {
 479         if (hwswitch & (BIT(radio - 1)))
 480                 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
 481 }
 482
 483 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 484 {
 485         int radio = ((unsigned long)data & 0xF);
 486         int hwswitch;
 487         int status;
 488         int ret;
 489
 490         dell_set_arguments(0, 0, 0, 0);
 491         ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 492         status = buffer->output[1];
 493
 494         if (ret != 0 || !(status & BIT(0))) {
 495                 return;
 496         }
 497
 498         dell_set_arguments(0, 0x2, 0, 0);
 499         ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 500         hwswitch = buffer->output[1];
 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_set_arguments(0, 0, 0, 0);
 523         ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 524         if (ret)
 525                 return ret;
 526         status = buffer->output[1];
 527
 528         dell_set_arguments(0, 0x2, 0, 0);
 529         hwswitch_ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 530         if (hwswitch_ret)
 531                 return hwswitch_ret;
 532         hwswitch_state = buffer->output[1];
 533
 534         seq_printf(s, "return:\t%d\n", ret);
 535         seq_printf(s, "status:\t0x%X\n", status);
 536         seq_printf(s, "Bit 0 : Hardware switch supported:   %lu\n",
 537                    status & BIT(0));
 538         seq_printf(s, "Bit 1 : Wifi locator supported:      %lu\n",
 539                   (status & BIT(1)) >> 1);
 540         seq_printf(s, "Bit 2 : Wifi is supported:           %lu\n",
 541                   (status & BIT(2)) >> 2);
 542         seq_printf(s, "Bit 3 : Bluetooth is supported:      %lu\n",
 543                   (status & BIT(3)) >> 3);
 544         seq_printf(s, "Bit 4 : WWAN is supported:           %lu\n",
 545                   (status & BIT(4)) >> 4);
 546         seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
 547                   (status & BIT(5)) >> 5);
 548         seq_printf(s, "Bit 6 : UWB supported:               %lu\n",
 549                   (status & BIT(6)) >> 6);
 550         seq_printf(s, "Bit 7 : WiGig supported:             %lu\n",
 551                   (status & BIT(7)) >> 7);
 552         seq_printf(s, "Bit 8 : Wifi is installed:           %lu\n",
 553                   (status & BIT(8)) >> 8);
 554         seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
 555                   (status & BIT(9)) >> 9);
 556         seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
 557                   (status & BIT(10)) >> 10);
 558         seq_printf(s, "Bit 11: UWB installed:               %lu\n",
 559                   (status & BIT(11)) >> 11);
 560         seq_printf(s, "Bit 12: WiGig installed:             %lu\n",
 561                   (status & BIT(12)) >> 12);
 562
 563         seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
 564                   (status & BIT(16)) >> 16);
 565         seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
 566                   (status & BIT(17)) >> 17);
 567         seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
 568                   (status & BIT(18)) >> 18);
 569         seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
 570                   (status & BIT(19)) >> 19);
 571         seq_printf(s, "Bit 20: UWB is blocked:              %lu\n",
 572                   (status & BIT(20)) >> 20);
 573         seq_printf(s, "Bit 21: WiGig is blocked:            %lu\n",
 574                   (status & BIT(21)) >> 21);
 575
 576         seq_printf(s, "\nhwswitch_return:\t%d\n", hwswitch_ret);
 577         seq_printf(s, "hwswitch_state:\t0x%X\n", hwswitch_state);
 578         seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
 579                    hwswitch_state & BIT(0));
 580         seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
 581                    (hwswitch_state & BIT(1)) >> 1);
 582         seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
 583                    (hwswitch_state & BIT(2)) >> 2);
 584         seq_printf(s, "Bit 3 : UWB controlled by switch:       %lu\n",
 585                    (hwswitch_state & BIT(3)) >> 3);
 586         seq_printf(s, "Bit 4 : WiGig controlled by switch:     %lu\n",
 587                    (hwswitch_state & BIT(4)) >> 4);
 588         seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
 589                    (hwswitch_state & BIT(7)) >> 7);
 590         seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
 591                    (hwswitch_state & BIT(8)) >> 8);
 592         seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
 593                    (hwswitch_state & BIT(15)) >> 15);
 594
 595         return 0;
 596 }
 597
 598 static int dell_debugfs_open(struct inode *inode, struct file *file)
 599 {
 600         return single_open(file, dell_debugfs_show, inode->i_private);
 601 }
 602
 603 static const struct file_operations dell_debugfs_fops = {
 604         .owner = THIS_MODULE,
 605         .open = dell_debugfs_open,
 606         .read = seq_read,
 607         .llseek = seq_lseek,
 608         .release = single_release,
 609 };
 610
 611 static void dell_update_rfkill(struct work_struct *ignored)
 612 {
 613         int hwswitch = 0;
 614         int status;
 615         int ret;
 616
 617         dell_set_arguments(0, 0, 0, 0);
 618         ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 619         status = buffer->output[1];
 620
 621         if (ret != 0)
 622                 return;
 623
 624         dell_set_arguments(0, 0x2, 0, 0);
 625         ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 626
 627         if (ret == 0 && (status & BIT(0)))
 628                 hwswitch = buffer->output[1];
 629
 630         if (wifi_rfkill) {
 631                 dell_rfkill_update_hw_state(wifi_rfkill, 1, status, hwswitch);
 632                 dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
 633         }
 634         if (bluetooth_rfkill) {
 635                 dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status,
 636                                             hwswitch);
 637                 dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
 638         }
 639         if (wwan_rfkill) {
 640                 dell_rfkill_update_hw_state(wwan_rfkill, 3, status, hwswitch);
 641                 dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
 642         }
 643 }
 644 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
 645
 646 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
 647                               struct serio *port)
 648 {
 649         static bool extended;
 650
 651         if (str & I8042_STR_AUXDATA)
 652                 return false;
 653
 654         if (unlikely(data == 0xe0)) {
 655                 extended = true;
 656                 return false;
 657         } else if (unlikely(extended)) {
 658                 switch (data) {
 659                 case 0x8:
 660                         schedule_delayed_work(&dell_rfkill_work,
 661                                               round_jiffies_relative(HZ / 4));
 662                         break;
 663                 }
 664                 extended = false;
 665         }
 666
 667         return false;
 668 }
 669
 670 static int (*dell_rbtn_notifier_register_func)(struct notifier_block *);
 671 static int (*dell_rbtn_notifier_unregister_func)(struct notifier_block *);
 672
 673 static int dell_laptop_rbtn_notifier_call(struct notifier_block *nb,
 674                                           unsigned long action, void *data)
 675 {
 676         schedule_delayed_work(&dell_rfkill_work, 0);
 677         return NOTIFY_OK;
 678 }
 679
 680 static struct notifier_block dell_laptop_rbtn_notifier = {
 681         .notifier_call = dell_laptop_rbtn_notifier_call,
 682 };
 683
 684 static int __init dell_setup_rfkill(void)
 685 {
 686         int status, ret, whitelisted;
 687         const char *product;
 688
 689         /*
 690          * rfkill support causes trouble on various models, mostly Inspirons.
 691          * So we whitelist certain series, and don't support rfkill on others.
 692          */
 693         whitelisted = 0;
 694         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 695         if (product &&  (strncmp(product, "Latitude", 8) == 0 ||
 696                          strncmp(product, "Precision", 9) == 0))
 697                 whitelisted = 1;
 698         if (!force_rfkill && !whitelisted)
 699                 return 0;
 700
 701         dell_set_arguments(0, 0, 0, 0);
 702         ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
 703         status = buffer->output[1];
 704
 705         /* dell wireless info smbios call is not supported */
 706         if (ret != 0)
 707                 return 0;
 708
 709         /* rfkill is only tested on laptops with a hwswitch */
 710         if (!(status & BIT(0)) && !force_rfkill)
 711                 return 0;
 712
 713         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 714                 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
 715                                            RFKILL_TYPE_WLAN,
 716                                            &dell_rfkill_ops, (void *) 1);
 717                 if (!wifi_rfkill) {
 718                         ret = -ENOMEM;
 719                         goto err_wifi;
 720                 }
 721                 ret = rfkill_register(wifi_rfkill);
 722                 if (ret)
 723                         goto err_wifi;
 724         }
 725
 726         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 727                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
 728                                                 &platform_device->dev,
 729                                                 RFKILL_TYPE_BLUETOOTH,
 730                                                 &dell_rfkill_ops, (void *) 2);
 731                 if (!bluetooth_rfkill) {
 732                         ret = -ENOMEM;
 733                         goto err_bluetooth;
 734                 }
 735                 ret = rfkill_register(bluetooth_rfkill);
 736                 if (ret)
 737                         goto err_bluetooth;
 738         }
 739
 740         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 741                 wwan_rfkill = rfkill_alloc("dell-wwan",
 742                                            &platform_device->dev,
 743                                            RFKILL_TYPE_WWAN,
 744                                            &dell_rfkill_ops, (void *) 3);
 745                 if (!wwan_rfkill) {
 746                         ret = -ENOMEM;
 747                         goto err_wwan;
 748                 }
 749                 ret = rfkill_register(wwan_rfkill);
 750                 if (ret)
 751                         goto err_wwan;
 752         }
 753
 754         /*
 755          * Dell Airplane Mode Switch driver (dell-rbtn) supports ACPI devices
 756          * which can receive events from HW slider switch.
 757          *
 758          * Dell SMBIOS on whitelisted models supports controlling radio devices
 759          * but does not support receiving HW button switch events. We can use
 760          * i8042 filter hook function to receive keyboard data and handle
 761          * keycode for HW button.
 762          *
 763          * So if it is possible we will use Dell Airplane Mode Switch ACPI
 764          * driver for receiving HW events and Dell SMBIOS for setting rfkill
 765          * states. If ACPI driver or device is not available we will fallback to
 766          * i8042 filter hook function.
 767          *
 768          * To prevent duplicate rfkill devices which control and do same thing,
 769          * dell-rbtn driver will automatically remove its own rfkill devices
 770          * once function dell_rbtn_notifier_register() is called.
 771          */
 772
 773         dell_rbtn_notifier_register_func =
 774                 symbol_request(dell_rbtn_notifier_register);
 775         if (dell_rbtn_notifier_register_func) {
 776                 dell_rbtn_notifier_unregister_func =
 777                         symbol_request(dell_rbtn_notifier_unregister);
 778                 if (!dell_rbtn_notifier_unregister_func) {
 779                         symbol_put(dell_rbtn_notifier_register);
 780                         dell_rbtn_notifier_register_func = NULL;
 781                 }
 782         }
 783
 784         if (dell_rbtn_notifier_register_func) {
 785                 ret = dell_rbtn_notifier_register_func(
 786                         &dell_laptop_rbtn_notifier);
 787                 symbol_put(dell_rbtn_notifier_register);
 788                 dell_rbtn_notifier_register_func = NULL;
 789                 if (ret != 0) {
 790                         symbol_put(dell_rbtn_notifier_unregister);
 791                         dell_rbtn_notifier_unregister_func = NULL;
 792                 }
 793         } else {
 794                 pr_info("Symbols from dell-rbtn acpi driver are not available\n");
 795                 ret = -ENODEV;
 796         }
 797
 798         if (ret == 0) {
 799                 pr_info("Using dell-rbtn acpi driver for receiving events\n");
 800         } else if (ret != -ENODEV) {
 801                 pr_warn("Unable to register dell rbtn notifier\n");
 802                 goto err_filter;
 803         } else {
 804                 ret = i8042_install_filter(dell_laptop_i8042_filter);
 805                 if (ret) {
 806                         pr_warn("Unable to install key filter\n");
 807                         goto err_filter;
 808                 }
 809                 pr_info("Using i8042 filter function for receiving events\n");
 810         }
 811
 812         return 0;
 813 err_filter:
 814         if (wwan_rfkill)
 815                 rfkill_unregister(wwan_rfkill);
 816 err_wwan:
 817         rfkill_destroy(wwan_rfkill);
 818         if (bluetooth_rfkill)
 819                 rfkill_unregister(bluetooth_rfkill);
 820 err_bluetooth:
 821         rfkill_destroy(bluetooth_rfkill);
 822         if (wifi_rfkill)
 823                 rfkill_unregister(wifi_rfkill);
 824 err_wifi:
 825         rfkill_destroy(wifi_rfkill);
 826
 827         return ret;
 828 }
 829
 830 static void dell_cleanup_rfkill(void)
 831 {
 832         if (dell_rbtn_notifier_unregister_func) {
 833                 dell_rbtn_notifier_unregister_func(&dell_laptop_rbtn_notifier);
 834                 symbol_put(dell_rbtn_notifier_unregister);
 835                 dell_rbtn_notifier_unregister_func = NULL;
 836         } else {
 837                 i8042_remove_filter(dell_laptop_i8042_filter);
 838         }
 839         cancel_delayed_work_sync(&dell_rfkill_work);
 840         if (wifi_rfkill) {
 841                 rfkill_unregister(wifi_rfkill);
 842                 rfkill_destroy(wifi_rfkill);
 843         }
 844         if (bluetooth_rfkill) {
 845                 rfkill_unregister(bluetooth_rfkill);
 846                 rfkill_destroy(bluetooth_rfkill);
 847         }
 848         if (wwan_rfkill) {
 849                 rfkill_unregister(wwan_rfkill);
 850                 rfkill_destroy(wwan_rfkill);
 851         }
 852 }
 853
 854 static int dell_send_intensity(struct backlight_device *bd)
 855 {
 856         struct calling_interface_token *token;
 857         int ret;
 858
 859         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
 860         if (!token)
 861                 return -ENODEV;
 862
 863         dell_set_arguments(token->location, bd->props.brightness, 0, 0);
 864         if (power_supply_is_system_supplied() > 0)
 865                 ret = dell_send_request(CLASS_TOKEN_WRITE, SELECT_TOKEN_AC);
 866         else
 867                 ret = dell_send_request(CLASS_TOKEN_WRITE, SELECT_TOKEN_BAT);
 868
 869         return ret;
 870 }
 871
 872 static int dell_get_intensity(struct backlight_device *bd)
 873 {
 874         struct calling_interface_token *token;
 875         int ret;
 876
 877         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
 878         if (!token)
 879                 return -ENODEV;
 880
 881         dell_set_arguments(token->location, 0, 0, 0);
 882         if (power_supply_is_system_supplied() > 0)
 883                 ret = dell_send_request(CLASS_TOKEN_READ, SELECT_TOKEN_AC);
 884         else
 885                 ret = dell_send_request(CLASS_TOKEN_READ, SELECT_TOKEN_BAT);
 886
 887         if (ret == 0)
 888                 ret = buffer->output[1];
 889         return ret;
 890 }
 891
 892 static const struct backlight_ops dell_ops = {
 893         .get_brightness = dell_get_intensity,
 894         .update_status  = dell_send_intensity,
 895 };
 896
 897 static void touchpad_led_on(void)
 898 {
 899         int command = 0x97;
 900         char data = 1;
 901         i8042_command(&data, command | 1 << 12);
 902 }
 903
 904 static void touchpad_led_off(void)
 905 {
 906         int command = 0x97;
 907         char data = 2;
 908         i8042_command(&data, command | 1 << 12);
 909 }
 910
 911 static void touchpad_led_set(struct led_classdev *led_cdev,
 912         enum led_brightness value)
 913 {
 914         if (value > 0)
 915                 touchpad_led_on();
 916         else
 917                 touchpad_led_off();
 918 }
 919
 920 static struct led_classdev touchpad_led = {
 921         .name = "dell-laptop::touchpad",
 922         .brightness_set = touchpad_led_set,
 923         .flags = LED_CORE_SUSPENDRESUME,
 924 };
 925
 926 static int __init touchpad_led_init(struct device *dev)
 927 {
 928         return led_classdev_register(dev, &touchpad_led);
 929 }
 930
 931 static void touchpad_led_exit(void)
 932 {
 933         led_classdev_unregister(&touchpad_led);
 934 }
 935
 936 /*
 937  * Derived from information in smbios-keyboard-ctl:
 938  *
 939  * cbClass 4
 940  * cbSelect 11
 941  * Keyboard illumination
 942  * cbArg1 determines the function to be performed
 943  *
 944  * cbArg1 0x0 = Get Feature Information
 945  *  cbRES1         Standard return codes (0, -1, -2)
 946  *  cbRES2, word0  Bitmap of user-selectable modes
 947  *     bit 0     Always off (All systems)
 948  *     bit 1     Always on (Travis ATG, Siberia)
 949  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
 950  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
 951  *     bit 4     Auto: Input-activity-based On; input-activity based Off
 952  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
 953  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
 954  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
 955  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
 956  *     bits 9-15 Reserved for future use
 957  *  cbRES2, byte2  Reserved for future use
 958  *  cbRES2, byte3  Keyboard illumination type
 959  *     0         Reserved
 960  *     1         Tasklight
 961  *     2         Backlight
 962  *     3-255     Reserved for future use
 963  *  cbRES3, byte0  Supported auto keyboard illumination trigger bitmap.
 964  *     bit 0     Any keystroke
 965  *     bit 1     Touchpad activity
 966  *     bit 2     Pointing stick
 967  *     bit 3     Any mouse
 968  *     bits 4-7  Reserved for future use
 969  *  cbRES3, byte1  Supported timeout unit bitmap
 970  *     bit 0     Seconds
 971  *     bit 1     Minutes
 972  *     bit 2     Hours
 973  *     bit 3     Days
 974  *     bits 4-7  Reserved for future use
 975  *  cbRES3, byte2  Number of keyboard light brightness levels
 976  *  cbRES4, byte0  Maximum acceptable seconds value (0 if seconds not supported).
 977  *  cbRES4, byte1  Maximum acceptable minutes value (0 if minutes not supported).
 978  *  cbRES4, byte2  Maximum acceptable hours value (0 if hours not supported).
 979  *  cbRES4, byte3  Maximum acceptable days value (0 if days not supported)
 980  *
 981  * cbArg1 0x1 = Get Current State
 982  *  cbRES1         Standard return codes (0, -1, -2)
 983  *  cbRES2, word0  Bitmap of current mode state
 984  *     bit 0     Always off (All systems)
 985  *     bit 1     Always on (Travis ATG, Siberia)
 986  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
 987  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
 988  *     bit 4     Auto: Input-activity-based On; input-activity based Off
 989  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
 990  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
 991  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
 992  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
 993  *     bits 9-15 Reserved for future use
 994  *     Note: Only One bit can be set
 995  *  cbRES2, byte2  Currently active auto keyboard illumination triggers.
 996  *     bit 0     Any keystroke
 997  *     bit 1     Touchpad activity
 998  *     bit 2     Pointing stick
 999  *     bit 3     Any mouse
1000  *     bits 4-7  Reserved for future use
1001  *  cbRES2, byte3  Current Timeout on battery
1002  *     bits 7:6  Timeout units indicator:
1003  *     00b       Seconds
1004  *     01b       Minutes
1005  *     10b       Hours
1006  *     11b       Days
1007  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1008  *     NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte
1009  *     are set upon return from the [Get feature information] call.
1010  *  cbRES3, byte0  Current setting of ALS value that turns the light on or off.
1011  *  cbRES3, byte1  Current ALS reading
1012  *  cbRES3, byte2  Current keyboard light level.
1013  *  cbRES3, byte3  Current timeout on AC Power
1014  *     bits 7:6  Timeout units indicator:
1015  *     00b       Seconds
1016  *     01b       Minutes
1017  *     10b       Hours
1018  *     11b       Days
1019  *     Bits 5:0  Timeout value (0-63) in sec/min/hr/day
1020  *     NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte2
1021  *     are set upon return from the upon return from the [Get Feature information] call.
1022  *
1023  * cbArg1 0x2 = Set New State
1024  *  cbRES1         Standard return codes (0, -1, -2)
1025  *  cbArg2, word0  Bitmap of current mode state
1026  *     bit 0     Always off (All systems)
1027  *     bit 1     Always on (Travis ATG, Siberia)
1028  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1029  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1030  *     bit 4     Auto: Input-activity-based On; input-activity based Off
1031  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1032  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1033  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1034  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1035  *     bits 9-15 Reserved for future use
1036  *     Note: Only One bit can be set
1037  *  cbArg2, byte2  Desired auto keyboard illumination triggers. Must remain inactive to allow
1038  *                 keyboard to turn off automatically.
1039  *     bit 0     Any keystroke
1040  *     bit 1     Touchpad activity
1041  *     bit 2     Pointing stick
1042  *     bit 3     Any mouse
1043  *     bits 4-7  Reserved for future use
1044  *  cbArg2, byte3  Desired Timeout on battery
1045  *     bits 7:6  Timeout units indicator:
1046  *     00b       Seconds
1047  *     01b       Minutes
1048  *     10b       Hours
1049  *     11b       Days
1050  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1051  *  cbArg3, byte0  Desired setting of ALS value that turns the light on or off.
1052  *  cbArg3, byte2  Desired keyboard light level.
1053  *  cbArg3, byte3  Desired Timeout on AC power
1054  *     bits 7:6  Timeout units indicator:
1055  *     00b       Seconds
1056  *     01b       Minutes
1057  *     10b       Hours
1058  *     11b       Days
1059  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1060  */
1061
1062
1063 enum kbd_timeout_unit {
1064         KBD_TIMEOUT_SECONDS = 0,
1065         KBD_TIMEOUT_MINUTES,
1066         KBD_TIMEOUT_HOURS,
1067         KBD_TIMEOUT_DAYS,
1068 };
1069
1070 enum kbd_mode_bit {
1071         KBD_MODE_BIT_OFF = 0,
1072         KBD_MODE_BIT_ON,
1073         KBD_MODE_BIT_ALS,
1074         KBD_MODE_BIT_TRIGGER_ALS,
1075         KBD_MODE_BIT_TRIGGER,
1076         KBD_MODE_BIT_TRIGGER_25,
1077         KBD_MODE_BIT_TRIGGER_50,
1078         KBD_MODE_BIT_TRIGGER_75,
1079         KBD_MODE_BIT_TRIGGER_100,
1080 };
1081
1082 #define kbd_is_als_mode_bit(bit) \
1083         ((bit) == KBD_MODE_BIT_ALS || (bit) == KBD_MODE_BIT_TRIGGER_ALS)
1084 #define kbd_is_trigger_mode_bit(bit) \
1085         ((bit) >= KBD_MODE_BIT_TRIGGER_ALS && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1086 #define kbd_is_level_mode_bit(bit) \
1087         ((bit) >= KBD_MODE_BIT_TRIGGER_25 && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1088
1089 struct kbd_info {
1090         u16 modes;
1091         u8 type;
1092         u8 triggers;
1093         u8 levels;
1094         u8 seconds;
1095         u8 minutes;
1096         u8 hours;
1097         u8 days;
1098 };
1099
1100 struct kbd_state {
1101         u8 mode_bit;
1102         u8 triggers;
1103         u8 timeout_value;
1104         u8 timeout_unit;
1105         u8 timeout_value_ac;
1106         u8 timeout_unit_ac;
1107         u8 als_setting;
1108         u8 als_value;
1109         u8 level;
1110 };
1111
1112 static const int kbd_tokens[] = {
1113         KBD_LED_OFF_TOKEN,
1114         KBD_LED_AUTO_25_TOKEN,
1115         KBD_LED_AUTO_50_TOKEN,
1116         KBD_LED_AUTO_75_TOKEN,
1117         KBD_LED_AUTO_100_TOKEN,
1118         KBD_LED_ON_TOKEN,
1119 };
1120
1121 static u16 kbd_token_bits;
1122
1123 static struct kbd_info kbd_info;
1124 static bool kbd_als_supported;
1125 static bool kbd_triggers_supported;
1126 static bool kbd_timeout_ac_supported;
1127
1128 static u8 kbd_mode_levels[16];
1129 static int kbd_mode_levels_count;
1130
1131 static u8 kbd_previous_level;
1132 static u8 kbd_previous_mode_bit;
1133
1134 static bool kbd_led_present;
1135 static DEFINE_MUTEX(kbd_led_mutex);
1136
1137 /*
1138  * NOTE: there are three ways to set the keyboard backlight level.
1139  * First, via kbd_state.mode_bit (assigning KBD_MODE_BIT_TRIGGER_* value).
1140  * Second, via kbd_state.level (assigning numerical value <= kbd_info.levels).
1141  * Third, via SMBIOS tokens (KBD_LED_* in kbd_tokens)
1142  *
1143  * There are laptops which support only one of these methods. If we want to
1144  * support as many machines as possible we need to implement all three methods.
1145  * The first two methods use the kbd_state structure. The third uses SMBIOS
1146  * tokens. If kbd_info.levels == 0, the machine does not support setting the
1147  * keyboard backlight level via kbd_state.level.
1148  */
1149
1150 static int kbd_get_info(struct kbd_info *info)
1151 {
1152         u8 units;
1153         int ret;
1154
1155         dell_set_arguments(0, 0, 0, 0);
1156         ret = dell_send_request(CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1157         if (ret)
1158                 return ret;
1159
1160         info->modes = buffer->output[1] & 0xFFFF;
1161         info->type = (buffer->output[1] >> 24) & 0xFF;
1162         info->triggers = buffer->output[2] & 0xFF;
1163         units = (buffer->output[2] >> 8) & 0xFF;
1164         info->levels = (buffer->output[2] >> 16) & 0xFF;
1165
1166         if (quirks && quirks->kbd_led_levels_off_1 && info->levels)
1167                 info->levels--;
1168
1169         if (units & BIT(0))
1170                 info->seconds = (buffer->output[3] >> 0) & 0xFF;
1171         if (units & BIT(1))
1172                 info->minutes = (buffer->output[3] >> 8) & 0xFF;
1173         if (units & BIT(2))
1174                 info->hours = (buffer->output[3] >> 16) & 0xFF;
1175         if (units & BIT(3))
1176                 info->days = (buffer->output[3] >> 24) & 0xFF;
1177
1178         return ret;
1179 }
1180
1181 static unsigned int kbd_get_max_level(void)
1182 {
1183         if (kbd_info.levels != 0)
1184                 return kbd_info.levels;
1185         if (kbd_mode_levels_count > 0)
1186                 return kbd_mode_levels_count - 1;
1187         return 0;
1188 }
1189
1190 static int kbd_get_level(struct kbd_state *state)
1191 {
1192         int i;
1193
1194         if (kbd_info.levels != 0)
1195                 return state->level;
1196
1197         if (kbd_mode_levels_count > 0) {
1198                 for (i = 0; i < kbd_mode_levels_count; ++i)
1199                         if (kbd_mode_levels[i] == state->mode_bit)
1200                                 return i;
1201                 return 0;
1202         }
1203
1204         return -EINVAL;
1205 }
1206
1207 static int kbd_set_level(struct kbd_state *state, u8 level)
1208 {
1209         if (kbd_info.levels != 0) {
1210                 if (level != 0)
1211                         kbd_previous_level = level;
1212                 if (state->level == level)
1213                         return 0;
1214                 state->level = level;
1215                 if (level != 0 && state->mode_bit == KBD_MODE_BIT_OFF)
1216                         state->mode_bit = kbd_previous_mode_bit;
1217                 else if (level == 0 && state->mode_bit != KBD_MODE_BIT_OFF) {
1218                         kbd_previous_mode_bit = state->mode_bit;
1219                         state->mode_bit = KBD_MODE_BIT_OFF;
1220                 }
1221                 return 0;
1222         }
1223
1224         if (kbd_mode_levels_count > 0 && level < kbd_mode_levels_count) {
1225                 if (level != 0)
1226                         kbd_previous_level = level;
1227                 state->mode_bit = kbd_mode_levels[level];
1228                 return 0;
1229         }
1230
1231         return -EINVAL;
1232 }
1233
1234 static int kbd_get_state(struct kbd_state *state)
1235 {
1236         int ret;
1237
1238         dell_set_arguments(0x1, 0, 0, 0);
1239         ret = dell_send_request(CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1240         if (ret)
1241                 return ret;
1242
1243         state->mode_bit = ffs(buffer->output[1] & 0xFFFF);
1244         if (state->mode_bit != 0)
1245                 state->mode_bit--;
1246
1247         state->triggers = (buffer->output[1] >> 16) & 0xFF;
1248         state->timeout_value = (buffer->output[1] >> 24) & 0x3F;
1249         state->timeout_unit = (buffer->output[1] >> 30) & 0x3;
1250         state->als_setting = buffer->output[2] & 0xFF;
1251         state->als_value = (buffer->output[2] >> 8) & 0xFF;
1252         state->level = (buffer->output[2] >> 16) & 0xFF;
1253         state->timeout_value_ac = (buffer->output[2] >> 24) & 0x3F;
1254         state->timeout_unit_ac = (buffer->output[2] >> 30) & 0x3;
1255
1256         return ret;
1257 }
1258
1259 static int kbd_set_state(struct kbd_state *state)
1260 {
1261         int ret;
1262         u32 input1;
1263         u32 input2;
1264
1265         input1 = BIT(state->mode_bit) & 0xFFFF;
1266         input1 |= (state->triggers & 0xFF) << 16;
1267         input1 |= (state->timeout_value & 0x3F) << 24;
1268         input1 |= (state->timeout_unit & 0x3) << 30;
1269         input2 = state->als_setting & 0xFF;
1270         input2 |= (state->level & 0xFF) << 16;
1271         input2 |= (state->timeout_value_ac & 0x3F) << 24;
1272         input2 |= (state->timeout_unit_ac & 0x3) << 30;
1273         dell_set_arguments(0x2, input1, input2, 0);
1274         ret = dell_send_request(CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1275
1276         return ret;
1277 }
1278
1279 static int kbd_set_state_safe(struct kbd_state *state, struct kbd_state *old)
1280 {
1281         int ret;
1282
1283         ret = kbd_set_state(state);
1284         if (ret == 0)
1285                 return 0;
1286
1287         /*
1288          * When setting the new state fails,try to restore the previous one.
1289          * This is needed on some machines where BIOS sets a default state when
1290          * setting a new state fails. This default state could be all off.
1291          */
1292
1293         if (kbd_set_state(old))
1294                 pr_err("Setting old previous keyboard state failed\n");
1295
1296         return ret;
1297 }
1298
1299 static int kbd_set_token_bit(u8 bit)
1300 {
1301         struct calling_interface_token *token;
1302         int ret;
1303
1304         if (bit >= ARRAY_SIZE(kbd_tokens))
1305                 return -EINVAL;
1306
1307         token = dell_smbios_find_token(kbd_tokens[bit]);
1308         if (!token)
1309                 return -EINVAL;
1310
1311         dell_set_arguments(token->location, token->value, 0, 0);
1312         ret = dell_send_request(CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
1313
1314         return ret;
1315 }
1316
1317 static int kbd_get_token_bit(u8 bit)
1318 {
1319         struct calling_interface_token *token;
1320         int ret;
1321         int val;
1322
1323         if (bit >= ARRAY_SIZE(kbd_tokens))
1324                 return -EINVAL;
1325
1326         token = dell_smbios_find_token(kbd_tokens[bit]);
1327         if (!token)
1328                 return -EINVAL;
1329
1330         dell_set_arguments(token->location, 0, 0, 0);
1331         ret = dell_send_request(CLASS_TOKEN_READ, SELECT_TOKEN_STD);
1332         val = buffer->output[1];
1333
1334         if (ret)
1335                 return ret;
1336
1337         return (val == token->value);
1338 }
1339
1340 static int kbd_get_first_active_token_bit(void)
1341 {
1342         int i;
1343         int ret;
1344
1345         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i) {
1346                 ret = kbd_get_token_bit(i);
1347                 if (ret == 1)
1348                         return i;
1349         }
1350
1351         return ret;
1352 }
1353
1354 static int kbd_get_valid_token_counts(void)
1355 {
1356         return hweight16(kbd_token_bits);
1357 }
1358
1359 static inline int kbd_init_info(void)
1360 {
1361         struct kbd_state state;
1362         int ret;
1363         int i;
1364
1365         ret = kbd_get_info(&kbd_info);
1366         if (ret)
1367                 return ret;
1368
1369         /* NOTE: Old models without KBD_LED_AC_TOKEN token supports only one
1370          *       timeout value which is shared for both battery and AC power
1371          *       settings. So do not try to set AC values on old models.
1372          */
1373         if (dell_smbios_find_token(KBD_LED_AC_TOKEN))
1374                 kbd_timeout_ac_supported = true;
1375
1376         kbd_get_state(&state);
1377
1378         /* NOTE: timeout value is stored in 6 bits so max value is 63 */
1379         if (kbd_info.seconds > 63)
1380                 kbd_info.seconds = 63;
1381         if (kbd_info.minutes > 63)
1382                 kbd_info.minutes = 63;
1383         if (kbd_info.hours > 63)
1384                 kbd_info.hours = 63;
1385         if (kbd_info.days > 63)
1386                 kbd_info.days = 63;
1387
1388         /* NOTE: On tested machines ON mode did not work and caused
1389          *       problems (turned backlight off) so do not use it
1390          */
1391         kbd_info.modes &= ~BIT(KBD_MODE_BIT_ON);
1392
1393         kbd_previous_level = kbd_get_level(&state);
1394         kbd_previous_mode_bit = state.mode_bit;
1395
1396         if (kbd_previous_level == 0 && kbd_get_max_level() != 0)
1397                 kbd_previous_level = 1;
1398
1399         if (kbd_previous_mode_bit == KBD_MODE_BIT_OFF) {
1400                 kbd_previous_mode_bit =
1401                         ffs(kbd_info.modes & ~BIT(KBD_MODE_BIT_OFF));
1402                 if (kbd_previous_mode_bit != 0)
1403                         kbd_previous_mode_bit--;
1404         }
1405
1406         if (kbd_info.modes & (BIT(KBD_MODE_BIT_ALS) |
1407                               BIT(KBD_MODE_BIT_TRIGGER_ALS)))
1408                 kbd_als_supported = true;
1409
1410         if (kbd_info.modes & (
1411             BIT(KBD_MODE_BIT_TRIGGER_ALS) | BIT(KBD_MODE_BIT_TRIGGER) |
1412             BIT(KBD_MODE_BIT_TRIGGER_25) | BIT(KBD_MODE_BIT_TRIGGER_50) |
1413             BIT(KBD_MODE_BIT_TRIGGER_75) | BIT(KBD_MODE_BIT_TRIGGER_100)
1414            ))
1415                 kbd_triggers_supported = true;
1416
1417         /* kbd_mode_levels[0] is reserved, see below */
1418         for (i = 0; i < 16; ++i)
1419                 if (kbd_is_level_mode_bit(i) && (BIT(i) & kbd_info.modes))
1420                         kbd_mode_levels[1 + kbd_mode_levels_count++] = i;
1421
1422         /*
1423          * Find the first supported mode and assign to kbd_mode_levels[0].
1424          * This should be 0 (off), but we cannot depend on the BIOS to
1425          * support 0.
1426          */
1427         if (kbd_mode_levels_count > 0) {
1428                 for (i = 0; i < 16; ++i) {
1429                         if (BIT(i) & kbd_info.modes) {
1430                                 kbd_mode_levels[0] = i;
1431                                 break;
1432                         }
1433                 }
1434                 kbd_mode_levels_count++;
1435         }
1436
1437         return 0;
1438
1439 }
1440
1441 static inline void kbd_init_tokens(void)
1442 {
1443         int i;
1444
1445         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i)
1446                 if (dell_smbios_find_token(kbd_tokens[i]))
1447                         kbd_token_bits |= BIT(i);
1448 }
1449
1450 static void kbd_init(void)
1451 {
1452         int ret;
1453
1454         ret = kbd_init_info();
1455         kbd_init_tokens();
1456
1457         /*
1458          * Only supports keyboard backlight when it has at least two modes.
1459          */
1460         if ((ret == 0 && (kbd_info.levels != 0 || kbd_mode_levels_count >= 2))
1461             || kbd_get_valid_token_counts() >= 2)
1462                 kbd_led_present = true;
1463 }
1464
1465 static ssize_t kbd_led_timeout_store(struct device *dev,
1466                                      struct device_attribute *attr,
1467                                      const char *buf, size_t count)
1468 {
1469         struct kbd_state new_state;
1470         struct kbd_state state;
1471         bool convert;
1472         int value;
1473         int ret;
1474         char ch;
1475         u8 unit;
1476         int i;
1477
1478         ret = sscanf(buf, "%d %c", &value, &ch);
1479         if (ret < 1)
1480                 return -EINVAL;
1481         else if (ret == 1)
1482                 ch = 's';
1483
1484         if (value < 0)
1485                 return -EINVAL;
1486
1487         convert = false;
1488
1489         switch (ch) {
1490         case 's':
1491                 if (value > kbd_info.seconds)
1492                         convert = true;
1493                 unit = KBD_TIMEOUT_SECONDS;
1494                 break;
1495         case 'm':
1496                 if (value > kbd_info.minutes)
1497                         convert = true;
1498                 unit = KBD_TIMEOUT_MINUTES;
1499                 break;
1500         case 'h':
1501                 if (value > kbd_info.hours)
1502                         convert = true;
1503                 unit = KBD_TIMEOUT_HOURS;
1504                 break;
1505         case 'd':
1506                 if (value > kbd_info.days)
1507                         convert = true;
1508                 unit = KBD_TIMEOUT_DAYS;
1509                 break;
1510         default:
1511                 return -EINVAL;
1512         }
1513
1514         if (quirks && quirks->needs_kbd_timeouts)
1515                 convert = true;
1516
1517         if (convert) {
1518                 /* Convert value from current units to seconds */
1519                 switch (unit) {
1520                 case KBD_TIMEOUT_DAYS:
1521                         value *= 24;
1522                 case KBD_TIMEOUT_HOURS:
1523                         value *= 60;
1524                 case KBD_TIMEOUT_MINUTES:
1525                         value *= 60;
1526                         unit = KBD_TIMEOUT_SECONDS;
1527                 }
1528
1529                 if (quirks && quirks->needs_kbd_timeouts) {
1530                         for (i = 0; quirks->kbd_timeouts[i] != -1; i++) {
1531                                 if (value <= quirks->kbd_timeouts[i]) {
1532                                         value = quirks->kbd_timeouts[i];
1533                                         break;
1534                                 }
1535                         }
1536                 }
1537
1538                 if (value <= kbd_info.seconds && kbd_info.seconds) {
1539                         unit = KBD_TIMEOUT_SECONDS;
1540                 } else if (value / 60 <= kbd_info.minutes && kbd_info.minutes) {
1541                         value /= 60;
1542                         unit = KBD_TIMEOUT_MINUTES;
1543                 } else if (value / (60 * 60) <= kbd_info.hours && kbd_info.hours) {
1544                         value /= (60 * 60);
1545                         unit = KBD_TIMEOUT_HOURS;
1546                 } else if (value / (60 * 60 * 24) <= kbd_info.days && kbd_info.days) {
1547                         value /= (60 * 60 * 24);
1548                         unit = KBD_TIMEOUT_DAYS;
1549                 } else {
1550                         return -EINVAL;
1551                 }
1552         }
1553
1554         mutex_lock(&kbd_led_mutex);
1555
1556         ret = kbd_get_state(&state);
1557         if (ret)
1558                 goto out;
1559
1560         new_state = state;
1561
1562         if (kbd_timeout_ac_supported && power_supply_is_system_supplied() > 0) {
1563                 new_state.timeout_value_ac = value;
1564                 new_state.timeout_unit_ac = unit;
1565         } else {
1566                 new_state.timeout_value = value;
1567                 new_state.timeout_unit = unit;
1568         }
1569
1570         ret = kbd_set_state_safe(&new_state, &state);
1571         if (ret)
1572                 goto out;
1573
1574         ret = count;
1575 out:
1576         mutex_unlock(&kbd_led_mutex);
1577         return ret;
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 value;
1585         int ret;
1586         int len;
1587         u8 unit;
1588
1589         ret = kbd_get_state(&state);
1590         if (ret)
1591                 return ret;
1592
1593         if (kbd_timeout_ac_supported && power_supply_is_system_supplied() > 0) {
1594                 value = state.timeout_value_ac;
1595                 unit = state.timeout_unit_ac;
1596         } else {
1597                 value = state.timeout_value;
1598                 unit = state.timeout_unit;
1599         }
1600
1601         len = sprintf(buf, "%d", value);
1602
1603         switch (unit) {
1604         case KBD_TIMEOUT_SECONDS:
1605                 return len + sprintf(buf+len, "s\n");
1606         case KBD_TIMEOUT_MINUTES:
1607                 return len + sprintf(buf+len, "m\n");
1608         case KBD_TIMEOUT_HOURS:
1609                 return len + sprintf(buf+len, "h\n");
1610         case KBD_TIMEOUT_DAYS:
1611                 return len + sprintf(buf+len, "d\n");
1612         default:
1613                 return -EINVAL;
1614         }
1615
1616         return len;
1617 }
1618
1619 static DEVICE_ATTR(stop_timeout, S_IRUGO | S_IWUSR,
1620                    kbd_led_timeout_show, kbd_led_timeout_store);
1621
1622 static const char * const kbd_led_triggers[] = {
1623         "keyboard",
1624         "touchpad",
1625         /*"trackstick"*/ NULL, /* NOTE: trackstick is just alias for touchpad */
1626         "mouse",
1627 };
1628
1629 static ssize_t kbd_led_triggers_store(struct device *dev,
1630                                       struct device_attribute *attr,
1631                                       const char *buf, size_t count)
1632 {
1633         struct kbd_state new_state;
1634         struct kbd_state state;
1635         bool triggers_enabled = false;
1636         int trigger_bit = -1;
1637         char trigger[21];
1638         int i, ret;
1639
1640         ret = sscanf(buf, "%20s", trigger);
1641         if (ret != 1)
1642                 return -EINVAL;
1643
1644         if (trigger[0] != '+' && trigger[0] != '-')
1645                 return -EINVAL;
1646
1647         mutex_lock(&kbd_led_mutex);
1648
1649         ret = kbd_get_state(&state);
1650         if (ret)
1651                 goto out;
1652
1653         if (kbd_triggers_supported)
1654                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1655
1656         if (kbd_triggers_supported) {
1657                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1658                         if (!(kbd_info.triggers & BIT(i)))
1659                                 continue;
1660                         if (!kbd_led_triggers[i])
1661                                 continue;
1662                         if (strcmp(trigger+1, kbd_led_triggers[i]) != 0)
1663                                 continue;
1664                         if (trigger[0] == '+' &&
1665                             triggers_enabled && (state.triggers & BIT(i))) {
1666                                 ret = count;
1667                                 goto out;
1668                         }
1669                         if (trigger[0] == '-' &&
1670                             (!triggers_enabled || !(state.triggers & BIT(i)))) {
1671                                 ret = count;
1672                                 goto out;
1673                         }
1674                         trigger_bit = i;
1675                         break;
1676                 }
1677         }
1678
1679         if (trigger_bit == -1) {
1680                 ret = -EINVAL;
1681                 goto out;
1682         }
1683
1684         new_state = state;
1685         if (trigger[0] == '+')
1686                 new_state.triggers |= BIT(trigger_bit);
1687         else {
1688                 new_state.triggers &= ~BIT(trigger_bit);
1689                 /*
1690                  * NOTE: trackstick bit (2) must be disabled when
1691                  *       disabling touchpad bit (1), otherwise touchpad
1692                  *       bit (1) will not be disabled
1693                  */
1694                 if (trigger_bit == 1)
1695                         new_state.triggers &= ~BIT(2);
1696         }
1697         if ((kbd_info.triggers & new_state.triggers) !=
1698             new_state.triggers) {
1699                 ret = -EINVAL;
1700                 goto out;
1701         }
1702         if (new_state.triggers && !triggers_enabled) {
1703                 new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1704                 kbd_set_level(&new_state, kbd_previous_level);
1705         } else if (new_state.triggers == 0) {
1706                 kbd_set_level(&new_state, 0);
1707         }
1708         if (!(kbd_info.modes & BIT(new_state.mode_bit))) {
1709                 ret = -EINVAL;
1710                 goto out;
1711         }
1712         ret = kbd_set_state_safe(&new_state, &state);
1713         if (ret)
1714                 goto out;
1715         if (new_state.mode_bit != KBD_MODE_BIT_OFF)
1716                 kbd_previous_mode_bit = new_state.mode_bit;
1717         ret = count;
1718 out:
1719         mutex_unlock(&kbd_led_mutex);
1720         return ret;
1721 }
1722
1723 static ssize_t kbd_led_triggers_show(struct device *dev,
1724                                      struct device_attribute *attr, char *buf)
1725 {
1726         struct kbd_state state;
1727         bool triggers_enabled;
1728         int level, i, ret;
1729         int len = 0;
1730
1731         ret = kbd_get_state(&state);
1732         if (ret)
1733                 return ret;
1734
1735         len = 0;
1736
1737         if (kbd_triggers_supported) {
1738                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1739                 level = kbd_get_level(&state);
1740                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1741                         if (!(kbd_info.triggers & BIT(i)))
1742                                 continue;
1743                         if (!kbd_led_triggers[i])
1744                                 continue;
1745                         if ((triggers_enabled || level <= 0) &&
1746                             (state.triggers & BIT(i)))
1747                                 buf[len++] = '+';
1748                         else
1749                                 buf[len++] = '-';
1750                         len += sprintf(buf+len, "%s ", kbd_led_triggers[i]);
1751                 }
1752         }
1753
1754         if (len)
1755                 buf[len - 1] = '\n';
1756
1757         return len;
1758 }
1759
1760 static DEVICE_ATTR(start_triggers, S_IRUGO | S_IWUSR,
1761                    kbd_led_triggers_show, kbd_led_triggers_store);
1762
1763 static ssize_t kbd_led_als_enabled_store(struct device *dev,
1764                                          struct device_attribute *attr,
1765                                          const char *buf, size_t count)
1766 {
1767         struct kbd_state new_state;
1768         struct kbd_state state;
1769         bool triggers_enabled = false;
1770         int enable;
1771         int ret;
1772
1773         ret = kstrtoint(buf, 0, &enable);
1774         if (ret)
1775                 return ret;
1776
1777         mutex_lock(&kbd_led_mutex);
1778
1779         ret = kbd_get_state(&state);
1780         if (ret)
1781                 goto out;
1782
1783         if (enable == kbd_is_als_mode_bit(state.mode_bit)) {
1784                 ret = count;
1785                 goto out;
1786         }
1787
1788         new_state = state;
1789
1790         if (kbd_triggers_supported)
1791                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1792
1793         if (enable) {
1794                 if (triggers_enabled)
1795                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER_ALS;
1796                 else
1797                         new_state.mode_bit = KBD_MODE_BIT_ALS;
1798         } else {
1799                 if (triggers_enabled) {
1800                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1801                         kbd_set_level(&new_state, kbd_previous_level);
1802                 } else {
1803                         new_state.mode_bit = KBD_MODE_BIT_ON;
1804                 }
1805         }
1806         if (!(kbd_info.modes & BIT(new_state.mode_bit)))  {
1807                 ret = -EINVAL;
1808                 goto out;
1809         }
1810
1811         ret = kbd_set_state_safe(&new_state, &state);
1812         if (ret)
1813                 goto out;
1814         kbd_previous_mode_bit = new_state.mode_bit;
1815
1816         ret = count;
1817 out:
1818         mutex_unlock(&kbd_led_mutex);
1819         return ret;
1820 }
1821
1822 static ssize_t kbd_led_als_enabled_show(struct device *dev,
1823                                         struct device_attribute *attr,
1824                                         char *buf)
1825 {
1826         struct kbd_state state;
1827         bool enabled = false;
1828         int ret;
1829
1830         ret = kbd_get_state(&state);
1831         if (ret)
1832                 return ret;
1833         enabled = kbd_is_als_mode_bit(state.mode_bit);
1834
1835         return sprintf(buf, "%d\n", enabled ? 1 : 0);
1836 }
1837
1838 static DEVICE_ATTR(als_enabled, S_IRUGO | S_IWUSR,
1839                    kbd_led_als_enabled_show, kbd_led_als_enabled_store);
1840
1841 static ssize_t kbd_led_als_setting_store(struct device *dev,
1842                                          struct device_attribute *attr,
1843                                          const char *buf, size_t count)
1844 {
1845         struct kbd_state state;
1846         struct kbd_state new_state;
1847         u8 setting;
1848         int ret;
1849
1850         ret = kstrtou8(buf, 10, &setting);
1851         if (ret)
1852                 return ret;
1853
1854         mutex_lock(&kbd_led_mutex);
1855
1856         ret = kbd_get_state(&state);
1857         if (ret)
1858                 goto out;
1859
1860         new_state = state;
1861         new_state.als_setting = setting;
1862
1863         ret = kbd_set_state_safe(&new_state, &state);
1864         if (ret)
1865                 goto out;
1866
1867         ret = count;
1868 out:
1869         mutex_unlock(&kbd_led_mutex);
1870         return ret;
1871 }
1872
1873 static ssize_t kbd_led_als_setting_show(struct device *dev,
1874                                         struct device_attribute *attr,
1875                                         char *buf)
1876 {
1877         struct kbd_state state;
1878         int ret;
1879
1880         ret = kbd_get_state(&state);
1881         if (ret)
1882                 return ret;
1883
1884         return sprintf(buf, "%d\n", state.als_setting);
1885 }
1886
1887 static DEVICE_ATTR(als_setting, S_IRUGO | S_IWUSR,
1888                    kbd_led_als_setting_show, kbd_led_als_setting_store);
1889
1890 static struct attribute *kbd_led_attrs[] = {
1891         &dev_attr_stop_timeout.attr,
1892         &dev_attr_start_triggers.attr,
1893         NULL,
1894 };
1895
1896 static const struct attribute_group kbd_led_group = {
1897         .attrs = kbd_led_attrs,
1898 };
1899
1900 static struct attribute *kbd_led_als_attrs[] = {
1901         &dev_attr_als_enabled.attr,
1902         &dev_attr_als_setting.attr,
1903         NULL,
1904 };
1905
1906 static const struct attribute_group kbd_led_als_group = {
1907         .attrs = kbd_led_als_attrs,
1908 };
1909
1910 static const struct attribute_group *kbd_led_groups[] = {
1911         &kbd_led_group,
1912         &kbd_led_als_group,
1913         NULL,
1914 };
1915
1916 static enum led_brightness kbd_led_level_get(struct led_classdev *led_cdev)
1917 {
1918         int ret;
1919         u16 num;
1920         struct kbd_state state;
1921
1922         if (kbd_get_max_level()) {
1923                 ret = kbd_get_state(&state);
1924                 if (ret)
1925                         return 0;
1926                 ret = kbd_get_level(&state);
1927                 if (ret < 0)
1928                         return 0;
1929                 return ret;
1930         }
1931
1932         if (kbd_get_valid_token_counts()) {
1933                 ret = kbd_get_first_active_token_bit();
1934                 if (ret < 0)
1935                         return 0;
1936                 for (num = kbd_token_bits; num != 0 && ret > 0; --ret)
1937                         num &= num - 1; /* clear the first bit set */
1938                 if (num == 0)
1939                         return 0;
1940                 return ffs(num) - 1;
1941         }
1942
1943         pr_warn("Keyboard brightness level control not supported\n");
1944         return 0;
1945 }
1946
1947 static int kbd_led_level_set(struct led_classdev *led_cdev,
1948                              enum led_brightness value)
1949 {
1950         struct kbd_state state;
1951         struct kbd_state new_state;
1952         u16 num;
1953         int ret;
1954
1955         mutex_lock(&kbd_led_mutex);
1956
1957         if (kbd_get_max_level()) {
1958                 ret = kbd_get_state(&state);
1959                 if (ret)
1960                         goto out;
1961                 new_state = state;
1962                 ret = kbd_set_level(&new_state, value);
1963                 if (ret)
1964                         goto out;
1965                 ret = kbd_set_state_safe(&new_state, &state);
1966         } else if (kbd_get_valid_token_counts()) {
1967                 for (num = kbd_token_bits; num != 0 && value > 0; --value)
1968                         num &= num - 1; /* clear the first bit set */
1969                 if (num == 0)
1970                         ret = 0;
1971                 else
1972                         ret = kbd_set_token_bit(ffs(num) - 1);
1973         } else {
1974                 pr_warn("Keyboard brightness level control not supported\n");
1975                 ret = -ENXIO;
1976         }
1977
1978 out:
1979         mutex_unlock(&kbd_led_mutex);
1980         return ret;
1981 }
1982
1983 static struct led_classdev kbd_led = {
1984         .name           = "dell::kbd_backlight",
1985         .flags          = LED_BRIGHT_HW_CHANGED,
1986         .brightness_set_blocking = kbd_led_level_set,
1987         .brightness_get = kbd_led_level_get,
1988         .groups         = kbd_led_groups,
1989 };
1990
1991 static int __init kbd_led_init(struct device *dev)
1992 {
1993         int ret;
1994
1995         kbd_init();
1996         if (!kbd_led_present)
1997                 return -ENODEV;
1998         if (!kbd_als_supported)
1999                 kbd_led_groups[1] = NULL;
2000         kbd_led.max_brightness = kbd_get_max_level();
2001         if (!kbd_led.max_brightness) {
2002                 kbd_led.max_brightness = kbd_get_valid_token_counts();
2003                 if (kbd_led.max_brightness)
2004                         kbd_led.max_brightness--;
2005         }
2006         ret = led_classdev_register(dev, &kbd_led);
2007         if (ret)
2008                 kbd_led_present = false;
2009
2010         return ret;
2011 }
2012
2013 static void brightness_set_exit(struct led_classdev *led_cdev,
2014                                 enum led_brightness value)
2015 {
2016         /* Don't change backlight level on exit */
2017 };
2018
2019 static void kbd_led_exit(void)
2020 {
2021         if (!kbd_led_present)
2022                 return;
2023         kbd_led.brightness_set = brightness_set_exit;
2024         led_classdev_unregister(&kbd_led);
2025 }
2026
2027 static int dell_laptop_notifier_call(struct notifier_block *nb,
2028                                      unsigned long action, void *data)
2029 {
2030         switch (action) {
2031         case DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED:
2032                 if (!kbd_led_present)
2033                         break;
2034
2035                 led_classdev_notify_brightness_hw_changed(&kbd_led,
2036                                                 kbd_led_level_get(&kbd_led));
2037                 break;
2038         }
2039
2040         return NOTIFY_OK;
2041 }
2042
2043 static struct notifier_block dell_laptop_notifier = {
2044         .notifier_call = dell_laptop_notifier_call,
2045 };
2046
2047 int dell_micmute_led_set(int state)
2048 {
2049         struct calling_interface_token *token;
2050
2051         if (state == 0)
2052                 token = dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE);
2053         else if (state == 1)
2054                 token = dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE);
2055         else
2056                 return -EINVAL;
2057
2058         if (!token)
2059                 return -ENODEV;
2060
2061         dell_set_arguments(token->location, token->value, 0, 0);
2062         dell_send_request(CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
2063
2064         return state;
2065 }
2066 EXPORT_SYMBOL_GPL(dell_micmute_led_set);
2067
2068 static int __init dell_init(void)
2069 {
2070         struct calling_interface_token *token;
2071         int max_intensity = 0;
2072         int ret;
2073
2074         if (!dmi_check_system(dell_device_table))
2075                 return -ENODEV;
2076
2077         quirks = NULL;
2078         /* find if this machine support other functions */
2079         dmi_check_system(dell_quirks);
2080
2081         ret = platform_driver_register(&platform_driver);
2082         if (ret)
2083                 goto fail_platform_driver;
2084         platform_device = platform_device_alloc("dell-laptop", -1);
2085         if (!platform_device) {
2086                 ret = -ENOMEM;
2087                 goto fail_platform_device1;
2088         }
2089         ret = platform_device_add(platform_device);
2090         if (ret)
2091                 goto fail_platform_device2;
2092
2093         buffer = kzalloc(sizeof(struct calling_interface_buffer), GFP_KERNEL);
2094         if (!buffer) {
2095                 ret = -ENOMEM;
2096                 goto fail_buffer;
2097         }
2098
2099
2100         ret = dell_setup_rfkill();
2101
2102         if (ret) {
2103                 pr_warn("Unable to setup rfkill\n");
2104                 goto fail_rfkill;
2105         }
2106
2107         if (quirks && quirks->touchpad_led)
2108                 touchpad_led_init(&platform_device->dev);
2109
2110         kbd_led_init(&platform_device->dev);
2111
2112         dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
2113         if (dell_laptop_dir != NULL)
2114                 debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
2115                                     &dell_debugfs_fops);
2116
2117         dell_laptop_register_notifier(&dell_laptop_notifier);
2118
2119         if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
2120                 return 0;
2121
2122         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
2123         if (token) {
2124                 dell_set_arguments(token->location, 0, 0, 0);
2125                 ret = dell_send_request(CLASS_TOKEN_READ, SELECT_TOKEN_AC);
2126                 if (ret)
2127                         max_intensity = buffer->output[3];
2128         }
2129
2130         if (max_intensity) {
2131                 struct backlight_properties props;
2132                 memset(&props, 0, sizeof(struct backlight_properties));
2133                 props.type = BACKLIGHT_PLATFORM;
2134                 props.max_brightness = max_intensity;
2135                 dell_backlight_device = backlight_device_register("dell_backlight",
2136                                                                   &platform_device->dev,
2137                                                                   NULL,
2138                                                                   &dell_ops,
2139                                                                   &props);
2140
2141                 if (IS_ERR(dell_backlight_device)) {
2142                         ret = PTR_ERR(dell_backlight_device);
2143                         dell_backlight_device = NULL;
2144                         goto fail_backlight;
2145                 }
2146
2147                 dell_backlight_device->props.brightness =
2148                         dell_get_intensity(dell_backlight_device);
2149                 if (dell_backlight_device->props.brightness < 0) {
2150                         ret = dell_backlight_device->props.brightness;
2151                         goto fail_get_brightness;
2152                 }
2153                 backlight_update_status(dell_backlight_device);
2154         }
2155
2156         return 0;
2157
2158 fail_get_brightness:
2159         backlight_device_unregister(dell_backlight_device);
2160 fail_backlight:
2161         kfree(buffer);
2162 fail_buffer:
2163         dell_cleanup_rfkill();
2164 fail_rfkill:
2165         platform_device_del(platform_device);
2166 fail_platform_device2:
2167         platform_device_put(platform_device);
2168 fail_platform_device1:
2169         platform_driver_unregister(&platform_driver);
2170 fail_platform_driver:
2171         return ret;
2172 }
2173
2174 static void __exit dell_exit(void)
2175 {
2176         dell_laptop_unregister_notifier(&dell_laptop_notifier);
2177         debugfs_remove_recursive(dell_laptop_dir);
2178         if (quirks && quirks->touchpad_led)
2179                 touchpad_led_exit();
2180         kbd_led_exit();
2181         backlight_device_unregister(dell_backlight_device);
2182         kfree(buffer);
2183         dell_cleanup_rfkill();
2184         if (platform_device) {
2185                 platform_device_unregister(platform_device);
2186                 platform_driver_unregister(&platform_driver);
2187         }
2188 }
2189
2190 /* dell-rbtn.c driver export functions which will not work correctly (and could
2191  * cause kernel crash) if they are called before dell-rbtn.c init code. This is
2192  * not problem when dell-rbtn.c is compiled as external module. When both files
2193  * (dell-rbtn.c and dell-laptop.c) are compiled statically into kernel, then we
2194  * need to ensure that dell_init() will be called after initializing dell-rbtn.
2195  * This can be achieved by late_initcall() instead module_init().
2196  */
2197 late_initcall(dell_init);
2198 module_exit(dell_exit);
2199
2200 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
2201 MODULE_AUTHOR("Gabriele Mazzotta <gabriele.mzt@gmail.com>");
2202 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
2203 MODULE_DESCRIPTION("Dell laptop driver");
2204 MODULE_LICENSE("GPL");