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         bool touchpad_led;
  40         bool kbd_led_not_present;
  41         bool kbd_led_levels_off_1;
  42         bool kbd_missing_ac_tag;
  43
  44         bool needs_kbd_timeouts;
  45         /*
  46          * Ordered list of timeouts expressed in seconds.
  47          * The list must end with -1
  48          */
  49         int kbd_timeouts[];
  50 };
  51
  52 static struct quirk_entry *quirks;
  53
  54 static struct quirk_entry quirk_dell_vostro_v130 = {
  55         .touchpad_led = true,
  56 };
  57
  58 static int __init dmi_matched(const struct dmi_system_id *dmi)
  59 {
  60         quirks = dmi->driver_data;
  61         return 1;
  62 }
  63
  64 /*
  65  * These values come from Windows utility provided by Dell. If any other value
  66  * is used then BIOS silently set timeout to 0 without any error message.
  67  */
  68 static struct quirk_entry quirk_dell_xps13_9333 = {
  69         .needs_kbd_timeouts = true,
  70         .kbd_timeouts = { 0, 5, 15, 60, 5 * 60, 15 * 60, -1 },
  71 };
  72
  73 static struct quirk_entry quirk_dell_xps13_9370 = {
  74         .kbd_missing_ac_tag = true,
  75 };
  76
  77 static struct quirk_entry quirk_dell_latitude_e6410 = {
  78         .kbd_led_levels_off_1 = true,
  79 };
  80
  81 static struct quirk_entry quirk_dell_inspiron_1012 = {
  82         .kbd_led_not_present = true,
  83 };
  84
  85 static struct platform_driver platform_driver = {
  86         .driver = {
  87                 .name = "dell-laptop",
  88         }
  89 };
  90
  91 static struct platform_device *platform_device;
  92 static struct backlight_device *dell_backlight_device;
  93 static struct rfkill *wifi_rfkill;
  94 static struct rfkill *bluetooth_rfkill;
  95 static struct rfkill *wwan_rfkill;
  96 static bool force_rfkill;
  97
  98 module_param(force_rfkill, bool, 0444);
  99 MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
 100
 101 static const struct dmi_system_id dell_device_table[] __initconst = {
 102         {
 103                 .ident = "Dell laptop",
 104                 .matches = {
 105                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 106                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 107                 },
 108         },
 109         {
 110                 .matches = {
 111                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 112                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
 113                 },
 114         },
 115         {
 116                 .matches = {
 117                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 118                         DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /*Notebook*/
 119                 },
 120         },
 121         {
 122                 .matches = {
 123                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 124                         DMI_MATCH(DMI_CHASSIS_TYPE, "30"), /*Tablet*/
 125                 },
 126         },
 127         {
 128                 .matches = {
 129                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 130                         DMI_MATCH(DMI_CHASSIS_TYPE, "31"), /*Convertible*/
 131                 },
 132         },
 133         {
 134                 .matches = {
 135                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 136                         DMI_MATCH(DMI_CHASSIS_TYPE, "32"), /*Detachable*/
 137                 },
 138         },
 139         {
 140                 .ident = "Dell Computer Corporation",
 141                 .matches = {
 142                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 143                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 144                 },
 145         },
 146         { }
 147 };
 148 MODULE_DEVICE_TABLE(dmi, dell_device_table);
 149
 150 static const struct dmi_system_id dell_quirks[] __initconst = {
 151         {
 152                 .callback = dmi_matched,
 153                 .ident = "Dell Vostro V130",
 154                 .matches = {
 155                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 156                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
 157                 },
 158                 .driver_data = &quirk_dell_vostro_v130,
 159         },
 160         {
 161                 .callback = dmi_matched,
 162                 .ident = "Dell Vostro V131",
 163                 .matches = {
 164                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 165                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 166                 },
 167                 .driver_data = &quirk_dell_vostro_v130,
 168         },
 169         {
 170                 .callback = dmi_matched,
 171                 .ident = "Dell Vostro 3350",
 172                 .matches = {
 173                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 174                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
 175                 },
 176                 .driver_data = &quirk_dell_vostro_v130,
 177         },
 178         {
 179                 .callback = dmi_matched,
 180                 .ident = "Dell Vostro 3555",
 181                 .matches = {
 182                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 183                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
 184                 },
 185                 .driver_data = &quirk_dell_vostro_v130,
 186         },
 187         {
 188                 .callback = dmi_matched,
 189                 .ident = "Dell Inspiron N311z",
 190                 .matches = {
 191                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 192                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
 193                 },
 194                 .driver_data = &quirk_dell_vostro_v130,
 195         },
 196         {
 197                 .callback = dmi_matched,
 198                 .ident = "Dell Inspiron M5110",
 199                 .matches = {
 200                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 201                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
 202                 },
 203                 .driver_data = &quirk_dell_vostro_v130,
 204         },
 205         {
 206                 .callback = dmi_matched,
 207                 .ident = "Dell Vostro 3360",
 208                 .matches = {
 209                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 210                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
 211                 },
 212                 .driver_data = &quirk_dell_vostro_v130,
 213         },
 214         {
 215                 .callback = dmi_matched,
 216                 .ident = "Dell Vostro 3460",
 217                 .matches = {
 218                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 219                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"),
 220                 },
 221                 .driver_data = &quirk_dell_vostro_v130,
 222         },
 223         {
 224                 .callback = dmi_matched,
 225                 .ident = "Dell Vostro 3560",
 226                 .matches = {
 227                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 228                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"),
 229                 },
 230                 .driver_data = &quirk_dell_vostro_v130,
 231         },
 232         {
 233                 .callback = dmi_matched,
 234                 .ident = "Dell Vostro 3450",
 235                 .matches = {
 236                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 237                         DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"),
 238                 },
 239                 .driver_data = &quirk_dell_vostro_v130,
 240         },
 241         {
 242                 .callback = dmi_matched,
 243                 .ident = "Dell Inspiron 5420",
 244                 .matches = {
 245                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 246                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"),
 247                 },
 248                 .driver_data = &quirk_dell_vostro_v130,
 249         },
 250         {
 251                 .callback = dmi_matched,
 252                 .ident = "Dell Inspiron 5520",
 253                 .matches = {
 254                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 255                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"),
 256                 },
 257                 .driver_data = &quirk_dell_vostro_v130,
 258         },
 259         {
 260                 .callback = dmi_matched,
 261                 .ident = "Dell Inspiron 5720",
 262                 .matches = {
 263                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 264                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"),
 265                 },
 266                 .driver_data = &quirk_dell_vostro_v130,
 267         },
 268         {
 269                 .callback = dmi_matched,
 270                 .ident = "Dell Inspiron 7420",
 271                 .matches = {
 272                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 273                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"),
 274                 },
 275                 .driver_data = &quirk_dell_vostro_v130,
 276         },
 277         {
 278                 .callback = dmi_matched,
 279                 .ident = "Dell Inspiron 7520",
 280                 .matches = {
 281                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 282                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
 283                 },
 284                 .driver_data = &quirk_dell_vostro_v130,
 285         },
 286         {
 287                 .callback = dmi_matched,
 288                 .ident = "Dell Inspiron 7720",
 289                 .matches = {
 290                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 291                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
 292                 },
 293                 .driver_data = &quirk_dell_vostro_v130,
 294         },
 295         {
 296                 .callback = dmi_matched,
 297                 .ident = "Dell XPS13 9333",
 298                 .matches = {
 299                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 300                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
 301                 },
 302                 .driver_data = &quirk_dell_xps13_9333,
 303         },
 304         {
 305                 .callback = dmi_matched,
 306                 .ident = "Dell XPS 13 9370",
 307                 .matches = {
 308                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 309                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS 13 9370"),
 310                 },
 311                 .driver_data = &quirk_dell_xps13_9370,
 312         },
 313         {
 314                 .callback = dmi_matched,
 315                 .ident = "Dell Latitude E6410",
 316                 .matches = {
 317                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 318                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6410"),
 319                 },
 320                 .driver_data = &quirk_dell_latitude_e6410,
 321         },
 322         {
 323                 .callback = dmi_matched,
 324                 .ident = "Dell Inspiron 1012",
 325                 .matches = {
 326                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 327                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"),
 328                 },
 329                 .driver_data = &quirk_dell_inspiron_1012,
 330         },
 331         {
 332                 .callback = dmi_matched,
 333                 .ident = "Dell Inspiron 1018",
 334                 .matches = {
 335                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 336                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1018"),
 337                 },
 338                 .driver_data = &quirk_dell_inspiron_1012,
 339         },
 340         { }
 341 };
 342
 343 static void dell_fill_request(struct calling_interface_buffer *buffer,
 344                                u32 arg0, u32 arg1, u32 arg2, u32 arg3)
 345 {
 346         memset(buffer, 0, sizeof(struct calling_interface_buffer));
 347         buffer->input[0] = arg0;
 348         buffer->input[1] = arg1;
 349         buffer->input[2] = arg2;
 350         buffer->input[3] = arg3;
 351 }
 352
 353 static int dell_send_request(struct calling_interface_buffer *buffer,
 354                              u16 class, u16 select)
 355 {
 356         int ret;
 357
 358         buffer->cmd_class = class;
 359         buffer->cmd_select = select;
 360         ret = dell_smbios_call(buffer);
 361         if (ret != 0)
 362                 return ret;
 363         return dell_smbios_error(buffer->output[0]);
 364 }
 365
 366 /*
 367  * Derived from information in smbios-wireless-ctl:
 368  *
 369  * cbSelect 17, Value 11
 370  *
 371  * Return Wireless Info
 372  * cbArg1, byte0 = 0x00
 373  *
 374  *     cbRes1 Standard return codes (0, -1, -2)
 375  *     cbRes2 Info bit flags:
 376  *
 377  *     0 Hardware switch supported (1)
 378  *     1 WiFi locator supported (1)
 379  *     2 WLAN supported (1)
 380  *     3 Bluetooth (BT) supported (1)
 381  *     4 WWAN supported (1)
 382  *     5 Wireless KBD supported (1)
 383  *     6 Uw b supported (1)
 384  *     7 WiGig supported (1)
 385  *     8 WLAN installed (1)
 386  *     9 BT installed (1)
 387  *     10 WWAN installed (1)
 388  *     11 Uw b installed (1)
 389  *     12 WiGig installed (1)
 390  *     13-15 Reserved (0)
 391  *     16 Hardware (HW) switch is On (1)
 392  *     17 WLAN disabled (1)
 393  *     18 BT disabled (1)
 394  *     19 WWAN disabled (1)
 395  *     20 Uw b disabled (1)
 396  *     21 WiGig disabled (1)
 397  *     20-31 Reserved (0)
 398  *
 399  *     cbRes3 NVRAM size in bytes
 400  *     cbRes4, byte 0 NVRAM format version number
 401  *
 402  *
 403  * Set QuickSet Radio Disable Flag
 404  *     cbArg1, byte0 = 0x01
 405  *     cbArg1, byte1
 406  *     Radio ID     value:
 407  *     0        Radio Status
 408  *     1        WLAN ID
 409  *     2        BT ID
 410  *     3        WWAN ID
 411  *     4        UWB ID
 412  *     5        WIGIG ID
 413  *     cbArg1, byte2    Flag bits:
 414  *             0 QuickSet disables radio (1)
 415  *             1-7 Reserved (0)
 416  *
 417  *     cbRes1    Standard return codes (0, -1, -2)
 418  *     cbRes2    QuickSet (QS) radio disable bit map:
 419  *     0 QS disables WLAN
 420  *     1 QS disables BT
 421  *     2 QS disables WWAN
 422  *     3 QS disables UWB
 423  *     4 QS disables WIGIG
 424  *     5-31 Reserved (0)
 425  *
 426  * Wireless Switch Configuration
 427  *     cbArg1, byte0 = 0x02
 428  *
 429  *     cbArg1, byte1
 430  *     Subcommand:
 431  *     0 Get config
 432  *     1 Set config
 433  *     2 Set WiFi locator enable/disable
 434  *     cbArg1,byte2
 435  *     Switch settings (if byte 1==1):
 436  *     0 WLAN sw itch control (1)
 437  *     1 BT sw itch control (1)
 438  *     2 WWAN sw itch control (1)
 439  *     3 UWB sw itch control (1)
 440  *     4 WiGig sw itch control (1)
 441  *     5-7 Reserved (0)
 442  *    cbArg1, byte2 Enable bits (if byte 1==2):
 443  *     0 Enable WiFi locator (1)
 444  *
 445  *    cbRes1     Standard return codes (0, -1, -2)
 446  *    cbRes2 QuickSet radio disable bit map:
 447  *     0 WLAN controlled by sw itch (1)
 448  *     1 BT controlled by sw itch (1)
 449  *     2 WWAN controlled by sw itch (1)
 450  *     3 UWB controlled by sw itch (1)
 451  *     4 WiGig controlled by sw itch (1)
 452  *     5-6 Reserved (0)
 453  *     7 Wireless sw itch config locked (1)
 454  *     8 WiFi locator enabled (1)
 455  *     9-14 Reserved (0)
 456  *     15 WiFi locator setting locked (1)
 457  *     16-31 Reserved (0)
 458  *
 459  * Read Local Config Data (LCD)
 460  *     cbArg1, byte0 = 0x10
 461  *     cbArg1, byte1 NVRAM index low byte
 462  *     cbArg1, byte2 NVRAM index high byte
 463  *     cbRes1 Standard return codes (0, -1, -2)
 464  *     cbRes2 4 bytes read from LCD[index]
 465  *     cbRes3 4 bytes read from LCD[index+4]
 466  *     cbRes4 4 bytes read from LCD[index+8]
 467  *
 468  * Write Local Config Data (LCD)
 469  *     cbArg1, byte0 = 0x11
 470  *     cbArg1, byte1 NVRAM index low byte
 471  *     cbArg1, byte2 NVRAM index high byte
 472  *     cbArg2 4 bytes to w rite at LCD[index]
 473  *     cbArg3 4 bytes to w rite at LCD[index+4]
 474  *     cbArg4 4 bytes to w rite at LCD[index+8]
 475  *     cbRes1 Standard return codes (0, -1, -2)
 476  *
 477  * Populate Local Config Data from NVRAM
 478  *     cbArg1, byte0 = 0x12
 479  *     cbRes1 Standard return codes (0, -1, -2)
 480  *
 481  * Commit Local Config Data to NVRAM
 482  *     cbArg1, byte0 = 0x13
 483  *     cbRes1 Standard return codes (0, -1, -2)
 484  */
 485
 486 static int dell_rfkill_set(void *data, bool blocked)
 487 {
 488         int disable = blocked ? 1 : 0;
 489         unsigned long radio = (unsigned long)data;
 490         int hwswitch_bit = (unsigned long)data - 1;
 491         struct calling_interface_buffer buffer;
 492         int hwswitch;
 493         int status;
 494         int ret;
 495
 496         dell_fill_request(&buffer, 0, 0, 0, 0);
 497         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 498         if (ret)
 499                 return ret;
 500         status = buffer.output[1];
 501
 502         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 503         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 504         if (ret)
 505                 return ret;
 506         hwswitch = buffer.output[1];
 507
 508         /* If the hardware switch controls this radio, and the hardware
 509            switch is disabled, always disable the radio */
 510         if (ret == 0 && (hwswitch & BIT(hwswitch_bit)) &&
 511             (status & BIT(0)) && !(status & BIT(16)))
 512                 disable = 1;
 513
 514         dell_fill_request(&buffer, 1 | (radio<<8) | (disable << 16), 0, 0, 0);
 515         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 516         return ret;
 517 }
 518
 519 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
 520                                         int status)
 521 {
 522         if (status & BIT(0)) {
 523                 /* Has hw-switch, sync sw_state to BIOS */
 524                 struct calling_interface_buffer buffer;
 525                 int block = rfkill_blocked(rfkill);
 526                 dell_fill_request(&buffer,
 527                                    1 | (radio << 8) | (block << 16), 0, 0, 0);
 528                 dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 529         } else {
 530                 /* No hw-switch, sync BIOS state to sw_state */
 531                 rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
 532         }
 533 }
 534
 535 static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
 536                                         int status, int hwswitch)
 537 {
 538         if (hwswitch & (BIT(radio - 1)))
 539                 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
 540 }
 541
 542 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 543 {
 544         int radio = ((unsigned long)data & 0xF);
 545         struct calling_interface_buffer buffer;
 546         int hwswitch;
 547         int status;
 548         int ret;
 549
 550         dell_fill_request(&buffer, 0, 0, 0, 0);
 551         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 552         status = buffer.output[1];
 553
 554         if (ret != 0 || !(status & BIT(0))) {
 555                 return;
 556         }
 557
 558         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 559         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 560         hwswitch = buffer.output[1];
 561
 562         if (ret != 0)
 563                 return;
 564
 565         dell_rfkill_update_hw_state(rfkill, radio, status, hwswitch);
 566 }
 567
 568 static const struct rfkill_ops dell_rfkill_ops = {
 569         .set_block = dell_rfkill_set,
 570         .query = dell_rfkill_query,
 571 };
 572
 573 static struct dentry *dell_laptop_dir;
 574
 575 static int dell_debugfs_show(struct seq_file *s, void *data)
 576 {
 577         struct calling_interface_buffer buffer;
 578         int hwswitch_state;
 579         int hwswitch_ret;
 580         int status;
 581         int ret;
 582
 583         dell_fill_request(&buffer, 0, 0, 0, 0);
 584         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 585         if (ret)
 586                 return ret;
 587         status = buffer.output[1];
 588
 589         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 590         hwswitch_ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 591         if (hwswitch_ret)
 592                 return hwswitch_ret;
 593         hwswitch_state = buffer.output[1];
 594
 595         seq_printf(s, "return:\t%d\n", ret);
 596         seq_printf(s, "status:\t0x%X\n", status);
 597         seq_printf(s, "Bit 0 : Hardware switch supported:   %lu\n",
 598                    status & BIT(0));
 599         seq_printf(s, "Bit 1 : Wifi locator supported:      %lu\n",
 600                   (status & BIT(1)) >> 1);
 601         seq_printf(s, "Bit 2 : Wifi is supported:           %lu\n",
 602                   (status & BIT(2)) >> 2);
 603         seq_printf(s, "Bit 3 : Bluetooth is supported:      %lu\n",
 604                   (status & BIT(3)) >> 3);
 605         seq_printf(s, "Bit 4 : WWAN is supported:           %lu\n",
 606                   (status & BIT(4)) >> 4);
 607         seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
 608                   (status & BIT(5)) >> 5);
 609         seq_printf(s, "Bit 6 : UWB supported:               %lu\n",
 610                   (status & BIT(6)) >> 6);
 611         seq_printf(s, "Bit 7 : WiGig supported:             %lu\n",
 612                   (status & BIT(7)) >> 7);
 613         seq_printf(s, "Bit 8 : Wifi is installed:           %lu\n",
 614                   (status & BIT(8)) >> 8);
 615         seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
 616                   (status & BIT(9)) >> 9);
 617         seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
 618                   (status & BIT(10)) >> 10);
 619         seq_printf(s, "Bit 11: UWB installed:               %lu\n",
 620                   (status & BIT(11)) >> 11);
 621         seq_printf(s, "Bit 12: WiGig installed:             %lu\n",
 622                   (status & BIT(12)) >> 12);
 623
 624         seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
 625                   (status & BIT(16)) >> 16);
 626         seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
 627                   (status & BIT(17)) >> 17);
 628         seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
 629                   (status & BIT(18)) >> 18);
 630         seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
 631                   (status & BIT(19)) >> 19);
 632         seq_printf(s, "Bit 20: UWB is blocked:              %lu\n",
 633                   (status & BIT(20)) >> 20);
 634         seq_printf(s, "Bit 21: WiGig is blocked:            %lu\n",
 635                   (status & BIT(21)) >> 21);
 636
 637         seq_printf(s, "\nhwswitch_return:\t%d\n", hwswitch_ret);
 638         seq_printf(s, "hwswitch_state:\t0x%X\n", hwswitch_state);
 639         seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
 640                    hwswitch_state & BIT(0));
 641         seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
 642                    (hwswitch_state & BIT(1)) >> 1);
 643         seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
 644                    (hwswitch_state & BIT(2)) >> 2);
 645         seq_printf(s, "Bit 3 : UWB controlled by switch:       %lu\n",
 646                    (hwswitch_state & BIT(3)) >> 3);
 647         seq_printf(s, "Bit 4 : WiGig controlled by switch:     %lu\n",
 648                    (hwswitch_state & BIT(4)) >> 4);
 649         seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
 650                    (hwswitch_state & BIT(7)) >> 7);
 651         seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
 652                    (hwswitch_state & BIT(8)) >> 8);
 653         seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
 654                    (hwswitch_state & BIT(15)) >> 15);
 655
 656         return 0;
 657 }
 658 DEFINE_SHOW_ATTRIBUTE(dell_debugfs);
 659
 660 static void dell_update_rfkill(struct work_struct *ignored)
 661 {
 662         struct calling_interface_buffer buffer;
 663         int hwswitch = 0;
 664         int status;
 665         int ret;
 666
 667         dell_fill_request(&buffer, 0, 0, 0, 0);
 668         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 669         status = buffer.output[1];
 670
 671         if (ret != 0)
 672                 return;
 673
 674         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 675         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 676
 677         if (ret == 0 && (status & BIT(0)))
 678                 hwswitch = buffer.output[1];
 679
 680         if (wifi_rfkill) {
 681                 dell_rfkill_update_hw_state(wifi_rfkill, 1, status, hwswitch);
 682                 dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
 683         }
 684         if (bluetooth_rfkill) {
 685                 dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status,
 686                                             hwswitch);
 687                 dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
 688         }
 689         if (wwan_rfkill) {
 690                 dell_rfkill_update_hw_state(wwan_rfkill, 3, status, hwswitch);
 691                 dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
 692         }
 693 }
 694 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
 695
 696 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
 697                               struct serio *port)
 698 {
 699         static bool extended;
 700
 701         if (str & I8042_STR_AUXDATA)
 702                 return false;
 703
 704         if (unlikely(data == 0xe0)) {
 705                 extended = true;
 706                 return false;
 707         } else if (unlikely(extended)) {
 708                 switch (data) {
 709                 case 0x8:
 710                         schedule_delayed_work(&dell_rfkill_work,
 711                                               round_jiffies_relative(HZ / 4));
 712                         break;
 713                 }
 714                 extended = false;
 715         }
 716
 717         return false;
 718 }
 719
 720 static int (*dell_rbtn_notifier_register_func)(struct notifier_block *);
 721 static int (*dell_rbtn_notifier_unregister_func)(struct notifier_block *);
 722
 723 static int dell_laptop_rbtn_notifier_call(struct notifier_block *nb,
 724                                           unsigned long action, void *data)
 725 {
 726         schedule_delayed_work(&dell_rfkill_work, 0);
 727         return NOTIFY_OK;
 728 }
 729
 730 static struct notifier_block dell_laptop_rbtn_notifier = {
 731         .notifier_call = dell_laptop_rbtn_notifier_call,
 732 };
 733
 734 static int __init dell_setup_rfkill(void)
 735 {
 736         struct calling_interface_buffer buffer;
 737         int status, ret, whitelisted;
 738         const char *product;
 739
 740         /*
 741          * rfkill support causes trouble on various models, mostly Inspirons.
 742          * So we whitelist certain series, and don't support rfkill on others.
 743          */
 744         whitelisted = 0;
 745         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 746         if (product &&  (strncmp(product, "Latitude", 8) == 0 ||
 747                          strncmp(product, "Precision", 9) == 0))
 748                 whitelisted = 1;
 749         if (!force_rfkill && !whitelisted)
 750                 return 0;
 751
 752         dell_fill_request(&buffer, 0, 0, 0, 0);
 753         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 754         status = buffer.output[1];
 755
 756         /* dell wireless info smbios call is not supported */
 757         if (ret != 0)
 758                 return 0;
 759
 760         /* rfkill is only tested on laptops with a hwswitch */
 761         if (!(status & BIT(0)) && !force_rfkill)
 762                 return 0;
 763
 764         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 765                 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
 766                                            RFKILL_TYPE_WLAN,
 767                                            &dell_rfkill_ops, (void *) 1);
 768                 if (!wifi_rfkill) {
 769                         ret = -ENOMEM;
 770                         goto err_wifi;
 771                 }
 772                 ret = rfkill_register(wifi_rfkill);
 773                 if (ret)
 774                         goto err_wifi;
 775         }
 776
 777         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 778                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
 779                                                 &platform_device->dev,
 780                                                 RFKILL_TYPE_BLUETOOTH,
 781                                                 &dell_rfkill_ops, (void *) 2);
 782                 if (!bluetooth_rfkill) {
 783                         ret = -ENOMEM;
 784                         goto err_bluetooth;
 785                 }
 786                 ret = rfkill_register(bluetooth_rfkill);
 787                 if (ret)
 788                         goto err_bluetooth;
 789         }
 790
 791         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 792                 wwan_rfkill = rfkill_alloc("dell-wwan",
 793                                            &platform_device->dev,
 794                                            RFKILL_TYPE_WWAN,
 795                                            &dell_rfkill_ops, (void *) 3);
 796                 if (!wwan_rfkill) {
 797                         ret = -ENOMEM;
 798                         goto err_wwan;
 799                 }
 800                 ret = rfkill_register(wwan_rfkill);
 801                 if (ret)
 802                         goto err_wwan;
 803         }
 804
 805         /*
 806          * Dell Airplane Mode Switch driver (dell-rbtn) supports ACPI devices
 807          * which can receive events from HW slider switch.
 808          *
 809          * Dell SMBIOS on whitelisted models supports controlling radio devices
 810          * but does not support receiving HW button switch events. We can use
 811          * i8042 filter hook function to receive keyboard data and handle
 812          * keycode for HW button.
 813          *
 814          * So if it is possible we will use Dell Airplane Mode Switch ACPI
 815          * driver for receiving HW events and Dell SMBIOS for setting rfkill
 816          * states. If ACPI driver or device is not available we will fallback to
 817          * i8042 filter hook function.
 818          *
 819          * To prevent duplicate rfkill devices which control and do same thing,
 820          * dell-rbtn driver will automatically remove its own rfkill devices
 821          * once function dell_rbtn_notifier_register() is called.
 822          */
 823
 824         dell_rbtn_notifier_register_func =
 825                 symbol_request(dell_rbtn_notifier_register);
 826         if (dell_rbtn_notifier_register_func) {
 827                 dell_rbtn_notifier_unregister_func =
 828                         symbol_request(dell_rbtn_notifier_unregister);
 829                 if (!dell_rbtn_notifier_unregister_func) {
 830                         symbol_put(dell_rbtn_notifier_register);
 831                         dell_rbtn_notifier_register_func = NULL;
 832                 }
 833         }
 834
 835         if (dell_rbtn_notifier_register_func) {
 836                 ret = dell_rbtn_notifier_register_func(
 837                         &dell_laptop_rbtn_notifier);
 838                 symbol_put(dell_rbtn_notifier_register);
 839                 dell_rbtn_notifier_register_func = NULL;
 840                 if (ret != 0) {
 841                         symbol_put(dell_rbtn_notifier_unregister);
 842                         dell_rbtn_notifier_unregister_func = NULL;
 843                 }
 844         } else {
 845                 pr_info("Symbols from dell-rbtn acpi driver are not available\n");
 846                 ret = -ENODEV;
 847         }
 848
 849         if (ret == 0) {
 850                 pr_info("Using dell-rbtn acpi driver for receiving events\n");
 851         } else if (ret != -ENODEV) {
 852                 pr_warn("Unable to register dell rbtn notifier\n");
 853                 goto err_filter;
 854         } else {
 855                 ret = i8042_install_filter(dell_laptop_i8042_filter);
 856                 if (ret) {
 857                         pr_warn("Unable to install key filter\n");
 858                         goto err_filter;
 859                 }
 860                 pr_info("Using i8042 filter function for receiving events\n");
 861         }
 862
 863         return 0;
 864 err_filter:
 865         if (wwan_rfkill)
 866                 rfkill_unregister(wwan_rfkill);
 867 err_wwan:
 868         rfkill_destroy(wwan_rfkill);
 869         if (bluetooth_rfkill)
 870                 rfkill_unregister(bluetooth_rfkill);
 871 err_bluetooth:
 872         rfkill_destroy(bluetooth_rfkill);
 873         if (wifi_rfkill)
 874                 rfkill_unregister(wifi_rfkill);
 875 err_wifi:
 876         rfkill_destroy(wifi_rfkill);
 877
 878         return ret;
 879 }
 880
 881 static void dell_cleanup_rfkill(void)
 882 {
 883         if (dell_rbtn_notifier_unregister_func) {
 884                 dell_rbtn_notifier_unregister_func(&dell_laptop_rbtn_notifier);
 885                 symbol_put(dell_rbtn_notifier_unregister);
 886                 dell_rbtn_notifier_unregister_func = NULL;
 887         } else {
 888                 i8042_remove_filter(dell_laptop_i8042_filter);
 889         }
 890         cancel_delayed_work_sync(&dell_rfkill_work);
 891         if (wifi_rfkill) {
 892                 rfkill_unregister(wifi_rfkill);
 893                 rfkill_destroy(wifi_rfkill);
 894         }
 895         if (bluetooth_rfkill) {
 896                 rfkill_unregister(bluetooth_rfkill);
 897                 rfkill_destroy(bluetooth_rfkill);
 898         }
 899         if (wwan_rfkill) {
 900                 rfkill_unregister(wwan_rfkill);
 901                 rfkill_destroy(wwan_rfkill);
 902         }
 903 }
 904
 905 static int dell_send_intensity(struct backlight_device *bd)
 906 {
 907         struct calling_interface_buffer buffer;
 908         struct calling_interface_token *token;
 909         int ret;
 910
 911         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
 912         if (!token)
 913                 return -ENODEV;
 914
 915         dell_fill_request(&buffer,
 916                            token->location, bd->props.brightness, 0, 0);
 917         if (power_supply_is_system_supplied() > 0)
 918                 ret = dell_send_request(&buffer,
 919                                         CLASS_TOKEN_WRITE, SELECT_TOKEN_AC);
 920         else
 921                 ret = dell_send_request(&buffer,
 922                                         CLASS_TOKEN_WRITE, SELECT_TOKEN_BAT);
 923
 924         return ret;
 925 }
 926
 927 static int dell_get_intensity(struct backlight_device *bd)
 928 {
 929         struct calling_interface_buffer buffer;
 930         struct calling_interface_token *token;
 931         int ret;
 932
 933         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
 934         if (!token)
 935                 return -ENODEV;
 936
 937         dell_fill_request(&buffer, token->location, 0, 0, 0);
 938         if (power_supply_is_system_supplied() > 0)
 939                 ret = dell_send_request(&buffer,
 940                                         CLASS_TOKEN_READ, SELECT_TOKEN_AC);
 941         else
 942                 ret = dell_send_request(&buffer,
 943                                         CLASS_TOKEN_READ, SELECT_TOKEN_BAT);
 944
 945         if (ret == 0)
 946                 ret = buffer.output[1];
 947
 948         return ret;
 949 }
 950
 951 static const struct backlight_ops dell_ops = {
 952         .get_brightness = dell_get_intensity,
 953         .update_status  = dell_send_intensity,
 954 };
 955
 956 static void touchpad_led_on(void)
 957 {
 958         int command = 0x97;
 959         char data = 1;
 960         i8042_command(&data, command | 1 << 12);
 961 }
 962
 963 static void touchpad_led_off(void)
 964 {
 965         int command = 0x97;
 966         char data = 2;
 967         i8042_command(&data, command | 1 << 12);
 968 }
 969
 970 static void touchpad_led_set(struct led_classdev *led_cdev,
 971         enum led_brightness value)
 972 {
 973         if (value > 0)
 974                 touchpad_led_on();
 975         else
 976                 touchpad_led_off();
 977 }
 978
 979 static struct led_classdev touchpad_led = {
 980         .name = "dell-laptop::touchpad",
 981         .brightness_set = touchpad_led_set,
 982         .flags = LED_CORE_SUSPENDRESUME,
 983 };
 984
 985 static int __init touchpad_led_init(struct device *dev)
 986 {
 987         return led_classdev_register(dev, &touchpad_led);
 988 }
 989
 990 static void touchpad_led_exit(void)
 991 {
 992         led_classdev_unregister(&touchpad_led);
 993 }
 994
 995 /*
 996  * Derived from information in smbios-keyboard-ctl:
 997  *
 998  * cbClass 4
 999  * cbSelect 11
1000  * Keyboard illumination
1001  * cbArg1 determines the function to be performed
1002  *
1003  * cbArg1 0x0 = Get Feature Information
1004  *  cbRES1         Standard return codes (0, -1, -2)
1005  *  cbRES2, word0  Bitmap of user-selectable modes
1006  *     bit 0     Always off (All systems)
1007  *     bit 1     Always on (Travis ATG, Siberia)
1008  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1009  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1010  *     bit 4     Auto: Input-activity-based On; input-activity based Off
1011  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1012  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1013  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1014  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1015  *     bits 9-15 Reserved for future use
1016  *  cbRES2, byte2  Reserved for future use
1017  *  cbRES2, byte3  Keyboard illumination type
1018  *     0         Reserved
1019  *     1         Tasklight
1020  *     2         Backlight
1021  *     3-255     Reserved for future use
1022  *  cbRES3, byte0  Supported auto keyboard illumination trigger bitmap.
1023  *     bit 0     Any keystroke
1024  *     bit 1     Touchpad activity
1025  *     bit 2     Pointing stick
1026  *     bit 3     Any mouse
1027  *     bits 4-7  Reserved for future use
1028  *  cbRES3, byte1  Supported timeout unit bitmap
1029  *     bit 0     Seconds
1030  *     bit 1     Minutes
1031  *     bit 2     Hours
1032  *     bit 3     Days
1033  *     bits 4-7  Reserved for future use
1034  *  cbRES3, byte2  Number of keyboard light brightness levels
1035  *  cbRES4, byte0  Maximum acceptable seconds value (0 if seconds not supported).
1036  *  cbRES4, byte1  Maximum acceptable minutes value (0 if minutes not supported).
1037  *  cbRES4, byte2  Maximum acceptable hours value (0 if hours not supported).
1038  *  cbRES4, byte3  Maximum acceptable days value (0 if days not supported)
1039  *
1040  * cbArg1 0x1 = Get Current State
1041  *  cbRES1         Standard return codes (0, -1, -2)
1042  *  cbRES2, word0  Bitmap of current mode state
1043  *     bit 0     Always off (All systems)
1044  *     bit 1     Always on (Travis ATG, Siberia)
1045  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1046  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1047  *     bit 4     Auto: Input-activity-based On; input-activity based Off
1048  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1049  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1050  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1051  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1052  *     bits 9-15 Reserved for future use
1053  *     Note: Only One bit can be set
1054  *  cbRES2, byte2  Currently active auto keyboard illumination triggers.
1055  *     bit 0     Any keystroke
1056  *     bit 1     Touchpad activity
1057  *     bit 2     Pointing stick
1058  *     bit 3     Any mouse
1059  *     bits 4-7  Reserved for future use
1060  *  cbRES2, byte3  Current Timeout on battery
1061  *     bits 7:6  Timeout units indicator:
1062  *     00b       Seconds
1063  *     01b       Minutes
1064  *     10b       Hours
1065  *     11b       Days
1066  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1067  *     NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte
1068  *     are set upon return from the [Get feature information] call.
1069  *  cbRES3, byte0  Current setting of ALS value that turns the light on or off.
1070  *  cbRES3, byte1  Current ALS reading
1071  *  cbRES3, byte2  Current keyboard light level.
1072  *  cbRES3, byte3  Current timeout on AC Power
1073  *     bits 7:6  Timeout units indicator:
1074  *     00b       Seconds
1075  *     01b       Minutes
1076  *     10b       Hours
1077  *     11b       Days
1078  *     Bits 5:0  Timeout value (0-63) in sec/min/hr/day
1079  *     NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte2
1080  *     are set upon return from the upon return from the [Get Feature information] call.
1081  *
1082  * cbArg1 0x2 = Set New State
1083  *  cbRES1         Standard return codes (0, -1, -2)
1084  *  cbArg2, word0  Bitmap of current mode state
1085  *     bit 0     Always off (All systems)
1086  *     bit 1     Always on (Travis ATG, Siberia)
1087  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1088  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1089  *     bit 4     Auto: Input-activity-based On; input-activity based Off
1090  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1091  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1092  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1093  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1094  *     bits 9-15 Reserved for future use
1095  *     Note: Only One bit can be set
1096  *  cbArg2, byte2  Desired auto keyboard illumination triggers. Must remain inactive to allow
1097  *                 keyboard to turn off automatically.
1098  *     bit 0     Any keystroke
1099  *     bit 1     Touchpad activity
1100  *     bit 2     Pointing stick
1101  *     bit 3     Any mouse
1102  *     bits 4-7  Reserved for future use
1103  *  cbArg2, byte3  Desired Timeout on battery
1104  *     bits 7:6  Timeout units indicator:
1105  *     00b       Seconds
1106  *     01b       Minutes
1107  *     10b       Hours
1108  *     11b       Days
1109  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1110  *  cbArg3, byte0  Desired setting of ALS value that turns the light on or off.
1111  *  cbArg3, byte2  Desired keyboard light level.
1112  *  cbArg3, byte3  Desired Timeout on AC power
1113  *     bits 7:6  Timeout units indicator:
1114  *     00b       Seconds
1115  *     01b       Minutes
1116  *     10b       Hours
1117  *     11b       Days
1118  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1119  */
1120
1121
1122 enum kbd_timeout_unit {
1123         KBD_TIMEOUT_SECONDS = 0,
1124         KBD_TIMEOUT_MINUTES,
1125         KBD_TIMEOUT_HOURS,
1126         KBD_TIMEOUT_DAYS,
1127 };
1128
1129 enum kbd_mode_bit {
1130         KBD_MODE_BIT_OFF = 0,
1131         KBD_MODE_BIT_ON,
1132         KBD_MODE_BIT_ALS,
1133         KBD_MODE_BIT_TRIGGER_ALS,
1134         KBD_MODE_BIT_TRIGGER,
1135         KBD_MODE_BIT_TRIGGER_25,
1136         KBD_MODE_BIT_TRIGGER_50,
1137         KBD_MODE_BIT_TRIGGER_75,
1138         KBD_MODE_BIT_TRIGGER_100,
1139 };
1140
1141 #define kbd_is_als_mode_bit(bit) \
1142         ((bit) == KBD_MODE_BIT_ALS || (bit) == KBD_MODE_BIT_TRIGGER_ALS)
1143 #define kbd_is_trigger_mode_bit(bit) \
1144         ((bit) >= KBD_MODE_BIT_TRIGGER_ALS && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1145 #define kbd_is_level_mode_bit(bit) \
1146         ((bit) >= KBD_MODE_BIT_TRIGGER_25 && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1147
1148 struct kbd_info {
1149         u16 modes;
1150         u8 type;
1151         u8 triggers;
1152         u8 levels;
1153         u8 seconds;
1154         u8 minutes;
1155         u8 hours;
1156         u8 days;
1157 };
1158
1159 struct kbd_state {
1160         u8 mode_bit;
1161         u8 triggers;
1162         u8 timeout_value;
1163         u8 timeout_unit;
1164         u8 timeout_value_ac;
1165         u8 timeout_unit_ac;
1166         u8 als_setting;
1167         u8 als_value;
1168         u8 level;
1169 };
1170
1171 static const int kbd_tokens[] = {
1172         KBD_LED_OFF_TOKEN,
1173         KBD_LED_AUTO_25_TOKEN,
1174         KBD_LED_AUTO_50_TOKEN,
1175         KBD_LED_AUTO_75_TOKEN,
1176         KBD_LED_AUTO_100_TOKEN,
1177         KBD_LED_ON_TOKEN,
1178 };
1179
1180 static u16 kbd_token_bits;
1181
1182 static struct kbd_info kbd_info;
1183 static bool kbd_als_supported;
1184 static bool kbd_triggers_supported;
1185 static bool kbd_timeout_ac_supported;
1186
1187 static u8 kbd_mode_levels[16];
1188 static int kbd_mode_levels_count;
1189
1190 static u8 kbd_previous_level;
1191 static u8 kbd_previous_mode_bit;
1192
1193 static bool kbd_led_present;
1194 static DEFINE_MUTEX(kbd_led_mutex);
1195 static enum led_brightness kbd_led_level;
1196
1197 /*
1198  * NOTE: there are three ways to set the keyboard backlight level.
1199  * First, via kbd_state.mode_bit (assigning KBD_MODE_BIT_TRIGGER_* value).
1200  * Second, via kbd_state.level (assigning numerical value <= kbd_info.levels).
1201  * Third, via SMBIOS tokens (KBD_LED_* in kbd_tokens)
1202  *
1203  * There are laptops which support only one of these methods. If we want to
1204  * support as many machines as possible we need to implement all three methods.
1205  * The first two methods use the kbd_state structure. The third uses SMBIOS
1206  * tokens. If kbd_info.levels == 0, the machine does not support setting the
1207  * keyboard backlight level via kbd_state.level.
1208  */
1209
1210 static int kbd_get_info(struct kbd_info *info)
1211 {
1212         struct calling_interface_buffer buffer;
1213         u8 units;
1214         int ret;
1215
1216         dell_fill_request(&buffer, 0, 0, 0, 0);
1217         ret = dell_send_request(&buffer,
1218                                 CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1219         if (ret)
1220                 return ret;
1221
1222         info->modes = buffer.output[1] & 0xFFFF;
1223         info->type = (buffer.output[1] >> 24) & 0xFF;
1224         info->triggers = buffer.output[2] & 0xFF;
1225         units = (buffer.output[2] >> 8) & 0xFF;
1226         info->levels = (buffer.output[2] >> 16) & 0xFF;
1227
1228         if (quirks && quirks->kbd_led_levels_off_1 && info->levels)
1229                 info->levels--;
1230
1231         if (units & BIT(0))
1232                 info->seconds = (buffer.output[3] >> 0) & 0xFF;
1233         if (units & BIT(1))
1234                 info->minutes = (buffer.output[3] >> 8) & 0xFF;
1235         if (units & BIT(2))
1236                 info->hours = (buffer.output[3] >> 16) & 0xFF;
1237         if (units & BIT(3))
1238                 info->days = (buffer.output[3] >> 24) & 0xFF;
1239
1240         return ret;
1241 }
1242
1243 static unsigned int kbd_get_max_level(void)
1244 {
1245         if (kbd_info.levels != 0)
1246                 return kbd_info.levels;
1247         if (kbd_mode_levels_count > 0)
1248                 return kbd_mode_levels_count - 1;
1249         return 0;
1250 }
1251
1252 static int kbd_get_level(struct kbd_state *state)
1253 {
1254         int i;
1255
1256         if (kbd_info.levels != 0)
1257                 return state->level;
1258
1259         if (kbd_mode_levels_count > 0) {
1260                 for (i = 0; i < kbd_mode_levels_count; ++i)
1261                         if (kbd_mode_levels[i] == state->mode_bit)
1262                                 return i;
1263                 return 0;
1264         }
1265
1266         return -EINVAL;
1267 }
1268
1269 static int kbd_set_level(struct kbd_state *state, u8 level)
1270 {
1271         if (kbd_info.levels != 0) {
1272                 if (level != 0)
1273                         kbd_previous_level = level;
1274                 if (state->level == level)
1275                         return 0;
1276                 state->level = level;
1277                 if (level != 0 && state->mode_bit == KBD_MODE_BIT_OFF)
1278                         state->mode_bit = kbd_previous_mode_bit;
1279                 else if (level == 0 && state->mode_bit != KBD_MODE_BIT_OFF) {
1280                         kbd_previous_mode_bit = state->mode_bit;
1281                         state->mode_bit = KBD_MODE_BIT_OFF;
1282                 }
1283                 return 0;
1284         }
1285
1286         if (kbd_mode_levels_count > 0 && level < kbd_mode_levels_count) {
1287                 if (level != 0)
1288                         kbd_previous_level = level;
1289                 state->mode_bit = kbd_mode_levels[level];
1290                 return 0;
1291         }
1292
1293         return -EINVAL;
1294 }
1295
1296 static int kbd_get_state(struct kbd_state *state)
1297 {
1298         struct calling_interface_buffer buffer;
1299         int ret;
1300
1301         dell_fill_request(&buffer, 0x1, 0, 0, 0);
1302         ret = dell_send_request(&buffer,
1303                                 CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1304         if (ret)
1305                 return ret;
1306
1307         state->mode_bit = ffs(buffer.output[1] & 0xFFFF);
1308         if (state->mode_bit != 0)
1309                 state->mode_bit--;
1310
1311         state->triggers = (buffer.output[1] >> 16) & 0xFF;
1312         state->timeout_value = (buffer.output[1] >> 24) & 0x3F;
1313         state->timeout_unit = (buffer.output[1] >> 30) & 0x3;
1314         state->als_setting = buffer.output[2] & 0xFF;
1315         state->als_value = (buffer.output[2] >> 8) & 0xFF;
1316         state->level = (buffer.output[2] >> 16) & 0xFF;
1317         state->timeout_value_ac = (buffer.output[2] >> 24) & 0x3F;
1318         state->timeout_unit_ac = (buffer.output[2] >> 30) & 0x3;
1319
1320         return ret;
1321 }
1322
1323 static int kbd_set_state(struct kbd_state *state)
1324 {
1325         struct calling_interface_buffer buffer;
1326         int ret;
1327         u32 input1;
1328         u32 input2;
1329
1330         input1 = BIT(state->mode_bit) & 0xFFFF;
1331         input1 |= (state->triggers & 0xFF) << 16;
1332         input1 |= (state->timeout_value & 0x3F) << 24;
1333         input1 |= (state->timeout_unit & 0x3) << 30;
1334         input2 = state->als_setting & 0xFF;
1335         input2 |= (state->level & 0xFF) << 16;
1336         input2 |= (state->timeout_value_ac & 0x3F) << 24;
1337         input2 |= (state->timeout_unit_ac & 0x3) << 30;
1338         dell_fill_request(&buffer, 0x2, input1, input2, 0);
1339         ret = dell_send_request(&buffer,
1340                                 CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1341
1342         return ret;
1343 }
1344
1345 static int kbd_set_state_safe(struct kbd_state *state, struct kbd_state *old)
1346 {
1347         int ret;
1348
1349         ret = kbd_set_state(state);
1350         if (ret == 0)
1351                 return 0;
1352
1353         /*
1354          * When setting the new state fails,try to restore the previous one.
1355          * This is needed on some machines where BIOS sets a default state when
1356          * setting a new state fails. This default state could be all off.
1357          */
1358
1359         if (kbd_set_state(old))
1360                 pr_err("Setting old previous keyboard state failed\n");
1361
1362         return ret;
1363 }
1364
1365 static int kbd_set_token_bit(u8 bit)
1366 {
1367         struct calling_interface_buffer buffer;
1368         struct calling_interface_token *token;
1369         int ret;
1370
1371         if (bit >= ARRAY_SIZE(kbd_tokens))
1372                 return -EINVAL;
1373
1374         token = dell_smbios_find_token(kbd_tokens[bit]);
1375         if (!token)
1376                 return -EINVAL;
1377
1378         dell_fill_request(&buffer, token->location, token->value, 0, 0);
1379         ret = dell_send_request(&buffer, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
1380
1381         return ret;
1382 }
1383
1384 static int kbd_get_token_bit(u8 bit)
1385 {
1386         struct calling_interface_buffer buffer;
1387         struct calling_interface_token *token;
1388         int ret;
1389         int val;
1390
1391         if (bit >= ARRAY_SIZE(kbd_tokens))
1392                 return -EINVAL;
1393
1394         token = dell_smbios_find_token(kbd_tokens[bit]);
1395         if (!token)
1396                 return -EINVAL;
1397
1398         dell_fill_request(&buffer, token->location, 0, 0, 0);
1399         ret = dell_send_request(&buffer, CLASS_TOKEN_READ, SELECT_TOKEN_STD);
1400         val = buffer.output[1];
1401
1402         if (ret)
1403                 return ret;
1404
1405         return (val == token->value);
1406 }
1407
1408 static int kbd_get_first_active_token_bit(void)
1409 {
1410         int i;
1411         int ret;
1412
1413         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i) {
1414                 ret = kbd_get_token_bit(i);
1415                 if (ret == 1)
1416                         return i;
1417         }
1418
1419         return ret;
1420 }
1421
1422 static int kbd_get_valid_token_counts(void)
1423 {
1424         return hweight16(kbd_token_bits);
1425 }
1426
1427 static inline int kbd_init_info(void)
1428 {
1429         struct kbd_state state;
1430         int ret;
1431         int i;
1432
1433         ret = kbd_get_info(&kbd_info);
1434         if (ret)
1435                 return ret;
1436
1437         /* NOTE: Old models without KBD_LED_AC_TOKEN token supports only one
1438          *       timeout value which is shared for both battery and AC power
1439          *       settings. So do not try to set AC values on old models.
1440          */
1441         if ((quirks && quirks->kbd_missing_ac_tag) ||
1442             dell_smbios_find_token(KBD_LED_AC_TOKEN))
1443                 kbd_timeout_ac_supported = true;
1444
1445         kbd_get_state(&state);
1446
1447         /* NOTE: timeout value is stored in 6 bits so max value is 63 */
1448         if (kbd_info.seconds > 63)
1449                 kbd_info.seconds = 63;
1450         if (kbd_info.minutes > 63)
1451                 kbd_info.minutes = 63;
1452         if (kbd_info.hours > 63)
1453                 kbd_info.hours = 63;
1454         if (kbd_info.days > 63)
1455                 kbd_info.days = 63;
1456
1457         /* NOTE: On tested machines ON mode did not work and caused
1458          *       problems (turned backlight off) so do not use it
1459          */
1460         kbd_info.modes &= ~BIT(KBD_MODE_BIT_ON);
1461
1462         kbd_previous_level = kbd_get_level(&state);
1463         kbd_previous_mode_bit = state.mode_bit;
1464
1465         if (kbd_previous_level == 0 && kbd_get_max_level() != 0)
1466                 kbd_previous_level = 1;
1467
1468         if (kbd_previous_mode_bit == KBD_MODE_BIT_OFF) {
1469                 kbd_previous_mode_bit =
1470                         ffs(kbd_info.modes & ~BIT(KBD_MODE_BIT_OFF));
1471                 if (kbd_previous_mode_bit != 0)
1472                         kbd_previous_mode_bit--;
1473         }
1474
1475         if (kbd_info.modes & (BIT(KBD_MODE_BIT_ALS) |
1476                               BIT(KBD_MODE_BIT_TRIGGER_ALS)))
1477                 kbd_als_supported = true;
1478
1479         if (kbd_info.modes & (
1480             BIT(KBD_MODE_BIT_TRIGGER_ALS) | BIT(KBD_MODE_BIT_TRIGGER) |
1481             BIT(KBD_MODE_BIT_TRIGGER_25) | BIT(KBD_MODE_BIT_TRIGGER_50) |
1482             BIT(KBD_MODE_BIT_TRIGGER_75) | BIT(KBD_MODE_BIT_TRIGGER_100)
1483            ))
1484                 kbd_triggers_supported = true;
1485
1486         /* kbd_mode_levels[0] is reserved, see below */
1487         for (i = 0; i < 16; ++i)
1488                 if (kbd_is_level_mode_bit(i) && (BIT(i) & kbd_info.modes))
1489                         kbd_mode_levels[1 + kbd_mode_levels_count++] = i;
1490
1491         /*
1492          * Find the first supported mode and assign to kbd_mode_levels[0].
1493          * This should be 0 (off), but we cannot depend on the BIOS to
1494          * support 0.
1495          */
1496         if (kbd_mode_levels_count > 0) {
1497                 for (i = 0; i < 16; ++i) {
1498                         if (BIT(i) & kbd_info.modes) {
1499                                 kbd_mode_levels[0] = i;
1500                                 break;
1501                         }
1502                 }
1503                 kbd_mode_levels_count++;
1504         }
1505
1506         return 0;
1507
1508 }
1509
1510 static inline void kbd_init_tokens(void)
1511 {
1512         int i;
1513
1514         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i)
1515                 if (dell_smbios_find_token(kbd_tokens[i]))
1516                         kbd_token_bits |= BIT(i);
1517 }
1518
1519 static void kbd_init(void)
1520 {
1521         int ret;
1522
1523         if (quirks && quirks->kbd_led_not_present)
1524                 return;
1525
1526         ret = kbd_init_info();
1527         kbd_init_tokens();
1528
1529         /*
1530          * Only supports keyboard backlight when it has at least two modes.
1531          */
1532         if ((ret == 0 && (kbd_info.levels != 0 || kbd_mode_levels_count >= 2))
1533             || kbd_get_valid_token_counts() >= 2)
1534                 kbd_led_present = true;
1535 }
1536
1537 static ssize_t kbd_led_timeout_store(struct device *dev,
1538                                      struct device_attribute *attr,
1539                                      const char *buf, size_t count)
1540 {
1541         struct kbd_state new_state;
1542         struct kbd_state state;
1543         bool convert;
1544         int value;
1545         int ret;
1546         char ch;
1547         u8 unit;
1548         int i;
1549
1550         ret = sscanf(buf, "%d %c", &value, &ch);
1551         if (ret < 1)
1552                 return -EINVAL;
1553         else if (ret == 1)
1554                 ch = 's';
1555
1556         if (value < 0)
1557                 return -EINVAL;
1558
1559         convert = false;
1560
1561         switch (ch) {
1562         case 's':
1563                 if (value > kbd_info.seconds)
1564                         convert = true;
1565                 unit = KBD_TIMEOUT_SECONDS;
1566                 break;
1567         case 'm':
1568                 if (value > kbd_info.minutes)
1569                         convert = true;
1570                 unit = KBD_TIMEOUT_MINUTES;
1571                 break;
1572         case 'h':
1573                 if (value > kbd_info.hours)
1574                         convert = true;
1575                 unit = KBD_TIMEOUT_HOURS;
1576                 break;
1577         case 'd':
1578                 if (value > kbd_info.days)
1579                         convert = true;
1580                 unit = KBD_TIMEOUT_DAYS;
1581                 break;
1582         default:
1583                 return -EINVAL;
1584         }
1585
1586         if (quirks && quirks->needs_kbd_timeouts)
1587                 convert = true;
1588
1589         if (convert) {
1590                 /* Convert value from current units to seconds */
1591                 switch (unit) {
1592                 case KBD_TIMEOUT_DAYS:
1593                         value *= 24;
1594                 case KBD_TIMEOUT_HOURS:
1595                         value *= 60;
1596                 case KBD_TIMEOUT_MINUTES:
1597                         value *= 60;
1598                         unit = KBD_TIMEOUT_SECONDS;
1599                 }
1600
1601                 if (quirks && quirks->needs_kbd_timeouts) {
1602                         for (i = 0; quirks->kbd_timeouts[i] != -1; i++) {
1603                                 if (value <= quirks->kbd_timeouts[i]) {
1604                                         value = quirks->kbd_timeouts[i];
1605                                         break;
1606                                 }
1607                         }
1608                 }
1609
1610                 if (value <= kbd_info.seconds && kbd_info.seconds) {
1611                         unit = KBD_TIMEOUT_SECONDS;
1612                 } else if (value / 60 <= kbd_info.minutes && kbd_info.minutes) {
1613                         value /= 60;
1614                         unit = KBD_TIMEOUT_MINUTES;
1615                 } else if (value / (60 * 60) <= kbd_info.hours && kbd_info.hours) {
1616                         value /= (60 * 60);
1617                         unit = KBD_TIMEOUT_HOURS;
1618                 } else if (value / (60 * 60 * 24) <= kbd_info.days && kbd_info.days) {
1619                         value /= (60 * 60 * 24);
1620                         unit = KBD_TIMEOUT_DAYS;
1621                 } else {
1622                         return -EINVAL;
1623                 }
1624         }
1625
1626         mutex_lock(&kbd_led_mutex);
1627
1628         ret = kbd_get_state(&state);
1629         if (ret)
1630                 goto out;
1631
1632         new_state = state;
1633
1634         if (kbd_timeout_ac_supported && power_supply_is_system_supplied() > 0) {
1635                 new_state.timeout_value_ac = value;
1636                 new_state.timeout_unit_ac = unit;
1637         } else {
1638                 new_state.timeout_value = value;
1639                 new_state.timeout_unit = unit;
1640         }
1641
1642         ret = kbd_set_state_safe(&new_state, &state);
1643         if (ret)
1644                 goto out;
1645
1646         ret = count;
1647 out:
1648         mutex_unlock(&kbd_led_mutex);
1649         return ret;
1650 }
1651
1652 static ssize_t kbd_led_timeout_show(struct device *dev,
1653                                     struct device_attribute *attr, char *buf)
1654 {
1655         struct kbd_state state;
1656         int value;
1657         int ret;
1658         int len;
1659         u8 unit;
1660
1661         ret = kbd_get_state(&state);
1662         if (ret)
1663                 return ret;
1664
1665         if (kbd_timeout_ac_supported && power_supply_is_system_supplied() > 0) {
1666                 value = state.timeout_value_ac;
1667                 unit = state.timeout_unit_ac;
1668         } else {
1669                 value = state.timeout_value;
1670                 unit = state.timeout_unit;
1671         }
1672
1673         len = sprintf(buf, "%d", value);
1674
1675         switch (unit) {
1676         case KBD_TIMEOUT_SECONDS:
1677                 return len + sprintf(buf+len, "s\n");
1678         case KBD_TIMEOUT_MINUTES:
1679                 return len + sprintf(buf+len, "m\n");
1680         case KBD_TIMEOUT_HOURS:
1681                 return len + sprintf(buf+len, "h\n");
1682         case KBD_TIMEOUT_DAYS:
1683                 return len + sprintf(buf+len, "d\n");
1684         default:
1685                 return -EINVAL;
1686         }
1687
1688         return len;
1689 }
1690
1691 static DEVICE_ATTR(stop_timeout, S_IRUGO | S_IWUSR,
1692                    kbd_led_timeout_show, kbd_led_timeout_store);
1693
1694 static const char * const kbd_led_triggers[] = {
1695         "keyboard",
1696         "touchpad",
1697         /*"trackstick"*/ NULL, /* NOTE: trackstick is just alias for touchpad */
1698         "mouse",
1699 };
1700
1701 static ssize_t kbd_led_triggers_store(struct device *dev,
1702                                       struct device_attribute *attr,
1703                                       const char *buf, size_t count)
1704 {
1705         struct kbd_state new_state;
1706         struct kbd_state state;
1707         bool triggers_enabled = false;
1708         int trigger_bit = -1;
1709         char trigger[21];
1710         int i, ret;
1711
1712         ret = sscanf(buf, "%20s", trigger);
1713         if (ret != 1)
1714                 return -EINVAL;
1715
1716         if (trigger[0] != '+' && trigger[0] != '-')
1717                 return -EINVAL;
1718
1719         mutex_lock(&kbd_led_mutex);
1720
1721         ret = kbd_get_state(&state);
1722         if (ret)
1723                 goto out;
1724
1725         if (kbd_triggers_supported)
1726                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1727
1728         if (kbd_triggers_supported) {
1729                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1730                         if (!(kbd_info.triggers & BIT(i)))
1731                                 continue;
1732                         if (!kbd_led_triggers[i])
1733                                 continue;
1734                         if (strcmp(trigger+1, kbd_led_triggers[i]) != 0)
1735                                 continue;
1736                         if (trigger[0] == '+' &&
1737                             triggers_enabled && (state.triggers & BIT(i))) {
1738                                 ret = count;
1739                                 goto out;
1740                         }
1741                         if (trigger[0] == '-' &&
1742                             (!triggers_enabled || !(state.triggers & BIT(i)))) {
1743                                 ret = count;
1744                                 goto out;
1745                         }
1746                         trigger_bit = i;
1747                         break;
1748                 }
1749         }
1750
1751         if (trigger_bit == -1) {
1752                 ret = -EINVAL;
1753                 goto out;
1754         }
1755
1756         new_state = state;
1757         if (trigger[0] == '+')
1758                 new_state.triggers |= BIT(trigger_bit);
1759         else {
1760                 new_state.triggers &= ~BIT(trigger_bit);
1761                 /*
1762                  * NOTE: trackstick bit (2) must be disabled when
1763                  *       disabling touchpad bit (1), otherwise touchpad
1764                  *       bit (1) will not be disabled
1765                  */
1766                 if (trigger_bit == 1)
1767                         new_state.triggers &= ~BIT(2);
1768         }
1769         if ((kbd_info.triggers & new_state.triggers) !=
1770             new_state.triggers) {
1771                 ret = -EINVAL;
1772                 goto out;
1773         }
1774         if (new_state.triggers && !triggers_enabled) {
1775                 new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1776                 kbd_set_level(&new_state, kbd_previous_level);
1777         } else if (new_state.triggers == 0) {
1778                 kbd_set_level(&new_state, 0);
1779         }
1780         if (!(kbd_info.modes & BIT(new_state.mode_bit))) {
1781                 ret = -EINVAL;
1782                 goto out;
1783         }
1784         ret = kbd_set_state_safe(&new_state, &state);
1785         if (ret)
1786                 goto out;
1787         if (new_state.mode_bit != KBD_MODE_BIT_OFF)
1788                 kbd_previous_mode_bit = new_state.mode_bit;
1789         ret = count;
1790 out:
1791         mutex_unlock(&kbd_led_mutex);
1792         return ret;
1793 }
1794
1795 static ssize_t kbd_led_triggers_show(struct device *dev,
1796                                      struct device_attribute *attr, char *buf)
1797 {
1798         struct kbd_state state;
1799         bool triggers_enabled;
1800         int level, i, ret;
1801         int len = 0;
1802
1803         ret = kbd_get_state(&state);
1804         if (ret)
1805                 return ret;
1806
1807         len = 0;
1808
1809         if (kbd_triggers_supported) {
1810                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1811                 level = kbd_get_level(&state);
1812                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1813                         if (!(kbd_info.triggers & BIT(i)))
1814                                 continue;
1815                         if (!kbd_led_triggers[i])
1816                                 continue;
1817                         if ((triggers_enabled || level <= 0) &&
1818                             (state.triggers & BIT(i)))
1819                                 buf[len++] = '+';
1820                         else
1821                                 buf[len++] = '-';
1822                         len += sprintf(buf+len, "%s ", kbd_led_triggers[i]);
1823                 }
1824         }
1825
1826         if (len)
1827                 buf[len - 1] = '\n';
1828
1829         return len;
1830 }
1831
1832 static DEVICE_ATTR(start_triggers, S_IRUGO | S_IWUSR,
1833                    kbd_led_triggers_show, kbd_led_triggers_store);
1834
1835 static ssize_t kbd_led_als_enabled_store(struct device *dev,
1836                                          struct device_attribute *attr,
1837                                          const char *buf, size_t count)
1838 {
1839         struct kbd_state new_state;
1840         struct kbd_state state;
1841         bool triggers_enabled = false;
1842         int enable;
1843         int ret;
1844
1845         ret = kstrtoint(buf, 0, &enable);
1846         if (ret)
1847                 return ret;
1848
1849         mutex_lock(&kbd_led_mutex);
1850
1851         ret = kbd_get_state(&state);
1852         if (ret)
1853                 goto out;
1854
1855         if (enable == kbd_is_als_mode_bit(state.mode_bit)) {
1856                 ret = count;
1857                 goto out;
1858         }
1859
1860         new_state = state;
1861
1862         if (kbd_triggers_supported)
1863                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1864
1865         if (enable) {
1866                 if (triggers_enabled)
1867                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER_ALS;
1868                 else
1869                         new_state.mode_bit = KBD_MODE_BIT_ALS;
1870         } else {
1871                 if (triggers_enabled) {
1872                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1873                         kbd_set_level(&new_state, kbd_previous_level);
1874                 } else {
1875                         new_state.mode_bit = KBD_MODE_BIT_ON;
1876                 }
1877         }
1878         if (!(kbd_info.modes & BIT(new_state.mode_bit)))  {
1879                 ret = -EINVAL;
1880                 goto out;
1881         }
1882
1883         ret = kbd_set_state_safe(&new_state, &state);
1884         if (ret)
1885                 goto out;
1886         kbd_previous_mode_bit = new_state.mode_bit;
1887
1888         ret = count;
1889 out:
1890         mutex_unlock(&kbd_led_mutex);
1891         return ret;
1892 }
1893
1894 static ssize_t kbd_led_als_enabled_show(struct device *dev,
1895                                         struct device_attribute *attr,
1896                                         char *buf)
1897 {
1898         struct kbd_state state;
1899         bool enabled = false;
1900         int ret;
1901
1902         ret = kbd_get_state(&state);
1903         if (ret)
1904                 return ret;
1905         enabled = kbd_is_als_mode_bit(state.mode_bit);
1906
1907         return sprintf(buf, "%d\n", enabled ? 1 : 0);
1908 }
1909
1910 static DEVICE_ATTR(als_enabled, S_IRUGO | S_IWUSR,
1911                    kbd_led_als_enabled_show, kbd_led_als_enabled_store);
1912
1913 static ssize_t kbd_led_als_setting_store(struct device *dev,
1914                                          struct device_attribute *attr,
1915                                          const char *buf, size_t count)
1916 {
1917         struct kbd_state state;
1918         struct kbd_state new_state;
1919         u8 setting;
1920         int ret;
1921
1922         ret = kstrtou8(buf, 10, &setting);
1923         if (ret)
1924                 return ret;
1925
1926         mutex_lock(&kbd_led_mutex);
1927
1928         ret = kbd_get_state(&state);
1929         if (ret)
1930                 goto out;
1931
1932         new_state = state;
1933         new_state.als_setting = setting;
1934
1935         ret = kbd_set_state_safe(&new_state, &state);
1936         if (ret)
1937                 goto out;
1938
1939         ret = count;
1940 out:
1941         mutex_unlock(&kbd_led_mutex);
1942         return ret;
1943 }
1944
1945 static ssize_t kbd_led_als_setting_show(struct device *dev,
1946                                         struct device_attribute *attr,
1947                                         char *buf)
1948 {
1949         struct kbd_state state;
1950         int ret;
1951
1952         ret = kbd_get_state(&state);
1953         if (ret)
1954                 return ret;
1955
1956         return sprintf(buf, "%d\n", state.als_setting);
1957 }
1958
1959 static DEVICE_ATTR(als_setting, S_IRUGO | S_IWUSR,
1960                    kbd_led_als_setting_show, kbd_led_als_setting_store);
1961
1962 static struct attribute *kbd_led_attrs[] = {
1963         &dev_attr_stop_timeout.attr,
1964         &dev_attr_start_triggers.attr,
1965         NULL,
1966 };
1967
1968 static const struct attribute_group kbd_led_group = {
1969         .attrs = kbd_led_attrs,
1970 };
1971
1972 static struct attribute *kbd_led_als_attrs[] = {
1973         &dev_attr_als_enabled.attr,
1974         &dev_attr_als_setting.attr,
1975         NULL,
1976 };
1977
1978 static const struct attribute_group kbd_led_als_group = {
1979         .attrs = kbd_led_als_attrs,
1980 };
1981
1982 static const struct attribute_group *kbd_led_groups[] = {
1983         &kbd_led_group,
1984         &kbd_led_als_group,
1985         NULL,
1986 };
1987
1988 static enum led_brightness kbd_led_level_get(struct led_classdev *led_cdev)
1989 {
1990         int ret;
1991         u16 num;
1992         struct kbd_state state;
1993
1994         if (kbd_get_max_level()) {
1995                 ret = kbd_get_state(&state);
1996                 if (ret)
1997                         return 0;
1998                 ret = kbd_get_level(&state);
1999                 if (ret < 0)
2000                         return 0;
2001                 return ret;
2002         }
2003
2004         if (kbd_get_valid_token_counts()) {
2005                 ret = kbd_get_first_active_token_bit();
2006                 if (ret < 0)
2007                         return 0;
2008                 for (num = kbd_token_bits; num != 0 && ret > 0; --ret)
2009                         num &= num - 1; /* clear the first bit set */
2010                 if (num == 0)
2011                         return 0;
2012                 return ffs(num) - 1;
2013         }
2014
2015         pr_warn("Keyboard brightness level control not supported\n");
2016         return 0;
2017 }
2018
2019 static int kbd_led_level_set(struct led_classdev *led_cdev,
2020                              enum led_brightness value)
2021 {
2022         enum led_brightness new_value = value;
2023         struct kbd_state state;
2024         struct kbd_state new_state;
2025         u16 num;
2026         int ret;
2027
2028         mutex_lock(&kbd_led_mutex);
2029
2030         if (kbd_get_max_level()) {
2031                 ret = kbd_get_state(&state);
2032                 if (ret)
2033                         goto out;
2034                 new_state = state;
2035                 ret = kbd_set_level(&new_state, value);
2036                 if (ret)
2037                         goto out;
2038                 ret = kbd_set_state_safe(&new_state, &state);
2039         } else if (kbd_get_valid_token_counts()) {
2040                 for (num = kbd_token_bits; num != 0 && value > 0; --value)
2041                         num &= num - 1; /* clear the first bit set */
2042                 if (num == 0)
2043                         ret = 0;
2044                 else
2045                         ret = kbd_set_token_bit(ffs(num) - 1);
2046         } else {
2047                 pr_warn("Keyboard brightness level control not supported\n");
2048                 ret = -ENXIO;
2049         }
2050
2051 out:
2052         if (ret == 0)
2053                 kbd_led_level = new_value;
2054
2055         mutex_unlock(&kbd_led_mutex);
2056         return ret;
2057 }
2058
2059 static struct led_classdev kbd_led = {
2060         .name           = "dell::kbd_backlight",
2061         .flags          = LED_BRIGHT_HW_CHANGED,
2062         .brightness_set_blocking = kbd_led_level_set,
2063         .brightness_get = kbd_led_level_get,
2064         .groups         = kbd_led_groups,
2065 };
2066
2067 static int __init kbd_led_init(struct device *dev)
2068 {
2069         int ret;
2070
2071         kbd_init();
2072         if (!kbd_led_present)
2073                 return -ENODEV;
2074         if (!kbd_als_supported)
2075                 kbd_led_groups[1] = NULL;
2076         kbd_led.max_brightness = kbd_get_max_level();
2077         if (!kbd_led.max_brightness) {
2078                 kbd_led.max_brightness = kbd_get_valid_token_counts();
2079                 if (kbd_led.max_brightness)
2080                         kbd_led.max_brightness--;
2081         }
2082
2083         kbd_led_level = kbd_led_level_get(NULL);
2084
2085         ret = led_classdev_register(dev, &kbd_led);
2086         if (ret)
2087                 kbd_led_present = false;
2088
2089         return ret;
2090 }
2091
2092 static void brightness_set_exit(struct led_classdev *led_cdev,
2093                                 enum led_brightness value)
2094 {
2095         /* Don't change backlight level on exit */
2096 };
2097
2098 static void kbd_led_exit(void)
2099 {
2100         if (!kbd_led_present)
2101                 return;
2102         kbd_led.brightness_set = brightness_set_exit;
2103         led_classdev_unregister(&kbd_led);
2104 }
2105
2106 static int dell_laptop_notifier_call(struct notifier_block *nb,
2107                                      unsigned long action, void *data)
2108 {
2109         bool changed = false;
2110         enum led_brightness new_kbd_led_level;
2111
2112         switch (action) {
2113         case DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED:
2114                 if (!kbd_led_present)
2115                         break;
2116
2117                 mutex_lock(&kbd_led_mutex);
2118                 new_kbd_led_level = kbd_led_level_get(&kbd_led);
2119                 if (kbd_led_level != new_kbd_led_level) {
2120                         kbd_led_level = new_kbd_led_level;
2121                         changed = true;
2122                 }
2123                 mutex_unlock(&kbd_led_mutex);
2124
2125                 if (changed)
2126                         led_classdev_notify_brightness_hw_changed(&kbd_led,
2127                                                                 kbd_led_level);
2128                 break;
2129         }
2130
2131         return NOTIFY_OK;
2132 }
2133
2134 static struct notifier_block dell_laptop_notifier = {
2135         .notifier_call = dell_laptop_notifier_call,
2136 };
2137
2138 int dell_micmute_led_set(int state)
2139 {
2140         struct calling_interface_buffer buffer;
2141         struct calling_interface_token *token;
2142
2143         if (state == 0)
2144                 token = dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE);
2145         else if (state == 1)
2146                 token = dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE);
2147         else
2148                 return -EINVAL;
2149
2150         if (!token)
2151                 return -ENODEV;
2152
2153         dell_fill_request(&buffer, token->location, token->value, 0, 0);
2154         dell_send_request(&buffer, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
2155
2156         return state;
2157 }
2158 EXPORT_SYMBOL_GPL(dell_micmute_led_set);
2159
2160 static int __init dell_init(void)
2161 {
2162         struct calling_interface_token *token;
2163         int max_intensity = 0;
2164         int ret;
2165
2166         if (!dmi_check_system(dell_device_table))
2167                 return -ENODEV;
2168
2169         quirks = NULL;
2170         /* find if this machine support other functions */
2171         dmi_check_system(dell_quirks);
2172
2173         ret = platform_driver_register(&platform_driver);
2174         if (ret)
2175                 goto fail_platform_driver;
2176         platform_device = platform_device_alloc("dell-laptop", -1);
2177         if (!platform_device) {
2178                 ret = -ENOMEM;
2179                 goto fail_platform_device1;
2180         }
2181         ret = platform_device_add(platform_device);
2182         if (ret)
2183                 goto fail_platform_device2;
2184
2185         ret = dell_setup_rfkill();
2186
2187         if (ret) {
2188                 pr_warn("Unable to setup rfkill\n");
2189                 goto fail_rfkill;
2190         }
2191
2192         if (quirks && quirks->touchpad_led)
2193                 touchpad_led_init(&platform_device->dev);
2194
2195         kbd_led_init(&platform_device->dev);
2196
2197         dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
2198         if (dell_laptop_dir != NULL)
2199                 debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
2200                                     &dell_debugfs_fops);
2201
2202         dell_laptop_register_notifier(&dell_laptop_notifier);
2203
2204         if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
2205                 return 0;
2206
2207         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
2208         if (token) {
2209                 struct calling_interface_buffer buffer;
2210
2211                 dell_fill_request(&buffer, token->location, 0, 0, 0);
2212                 ret = dell_send_request(&buffer,
2213                                         CLASS_TOKEN_READ, SELECT_TOKEN_AC);
2214                 if (ret == 0)
2215                         max_intensity = buffer.output[3];
2216         }
2217
2218         if (max_intensity) {
2219                 struct backlight_properties props;
2220                 memset(&props, 0, sizeof(struct backlight_properties));
2221                 props.type = BACKLIGHT_PLATFORM;
2222                 props.max_brightness = max_intensity;
2223                 dell_backlight_device = backlight_device_register("dell_backlight",
2224                                                                   &platform_device->dev,
2225                                                                   NULL,
2226                                                                   &dell_ops,
2227                                                                   &props);
2228
2229                 if (IS_ERR(dell_backlight_device)) {
2230                         ret = PTR_ERR(dell_backlight_device);
2231                         dell_backlight_device = NULL;
2232                         goto fail_backlight;
2233                 }
2234
2235                 dell_backlight_device->props.brightness =
2236                         dell_get_intensity(dell_backlight_device);
2237                 if (dell_backlight_device->props.brightness < 0) {
2238                         ret = dell_backlight_device->props.brightness;
2239                         goto fail_get_brightness;
2240                 }
2241                 backlight_update_status(dell_backlight_device);
2242         }
2243
2244         return 0;
2245
2246 fail_get_brightness:
2247         backlight_device_unregister(dell_backlight_device);
2248 fail_backlight:
2249         dell_cleanup_rfkill();
2250 fail_rfkill:
2251         platform_device_del(platform_device);
2252 fail_platform_device2:
2253         platform_device_put(platform_device);
2254 fail_platform_device1:
2255         platform_driver_unregister(&platform_driver);
2256 fail_platform_driver:
2257         return ret;
2258 }
2259
2260 static void __exit dell_exit(void)
2261 {
2262         dell_laptop_unregister_notifier(&dell_laptop_notifier);
2263         debugfs_remove_recursive(dell_laptop_dir);
2264         if (quirks && quirks->touchpad_led)
2265                 touchpad_led_exit();
2266         kbd_led_exit();
2267         backlight_device_unregister(dell_backlight_device);
2268         dell_cleanup_rfkill();
2269         if (platform_device) {
2270                 platform_device_unregister(platform_device);
2271                 platform_driver_unregister(&platform_driver);
2272         }
2273 }
2274
2275 /* dell-rbtn.c driver export functions which will not work correctly (and could
2276  * cause kernel crash) if they are called before dell-rbtn.c init code. This is
2277  * not problem when dell-rbtn.c is compiled as external module. When both files
2278  * (dell-rbtn.c and dell-laptop.c) are compiled statically into kernel, then we
2279  * need to ensure that dell_init() will be called after initializing dell-rbtn.
2280  * This can be achieved by late_initcall() instead module_init().
2281  */
2282 late_initcall(dell_init);
2283 module_exit(dell_exit);
2284
2285 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
2286 MODULE_AUTHOR("Gabriele Mazzotta <gabriele.mzt@gmail.com>");
2287 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
2288 MODULE_DESCRIPTION("Dell laptop driver");
2289 MODULE_LICENSE("GPL");