drivers/platform/x86/dell/dell-laptop.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Driver for Dell laptop extras
   4  *
   5  *  Copyright (c) Red Hat <mjg@redhat.com>
   6  *  Copyright (c) 2014 Gabriele Mazzotta <gabriele.mzt@gmail.com>
   7  *  Copyright (c) 2014 Pali Rohár <pali@kernel.org>
   8  *
   9  *  Based on documentation in the libsmbios package:
  10  *  Copyright (C) 2005-2014 Dell Inc.
  11  */
  12
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/backlight.h>
  20 #include <linux/err.h>
  21 #include <linux/dmi.h>
  22 #include <linux/io.h>
  23 #include <linux/rfkill.h>
  24 #include <linux/power_supply.h>
  25 #include <linux/acpi.h>
  26 #include <linux/mm.h>
  27 #include <linux/i8042.h>
  28 #include <linux/debugfs.h>
  29 #include <linux/seq_file.h>
  30 #include <acpi/video.h>
  31 #include "dell-rbtn.h"
  32 #include "dell-smbios.h"
  33
  34 #include "dell-wmi-privacy.h"
  35
  36 struct quirk_entry {
  37         bool touchpad_led;
  38         bool kbd_led_not_present;
  39         bool kbd_led_levels_off_1;
  40         bool kbd_missing_ac_tag;
  41
  42         bool 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 = true,
  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 = true,
  68         .kbd_timeouts = { 0, 5, 15, 60, 5 * 60, 15 * 60, -1 },
  69 };
  70
  71 static struct quirk_entry quirk_dell_xps13_9370 = {
  72         .kbd_missing_ac_tag = true,
  73 };
  74
  75 static struct quirk_entry quirk_dell_latitude_e6410 = {
  76         .kbd_led_levels_off_1 = true,
  77 };
  78
  79 static struct quirk_entry quirk_dell_inspiron_1012 = {
  80         .kbd_led_not_present = true,
  81 };
  82
  83 static struct quirk_entry quirk_dell_latitude_7520 = {
  84         .kbd_missing_ac_tag = true,
  85 };
  86
  87 static struct platform_driver platform_driver = {
  88         .driver = {
  89                 .name = "dell-laptop",
  90         }
  91 };
  92
  93 static struct platform_device *platform_device;
  94 static struct backlight_device *dell_backlight_device;
  95 static struct rfkill *wifi_rfkill;
  96 static struct rfkill *bluetooth_rfkill;
  97 static struct rfkill *wwan_rfkill;
  98 static bool force_rfkill;
  99 static bool micmute_led_registered;
 100
 101 module_param(force_rfkill, bool, 0444);
 102 MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
 103
 104 static const struct dmi_system_id dell_device_table[] __initconst = {
 105         {
 106                 .ident = "Dell laptop",
 107                 .matches = {
 108                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 109                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 110                 },
 111         },
 112         {
 113                 .matches = {
 114                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 115                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
 116                 },
 117         },
 118         {
 119                 .matches = {
 120                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 121                         DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /*Notebook*/
 122                 },
 123         },
 124         {
 125                 .matches = {
 126                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 127                         DMI_MATCH(DMI_CHASSIS_TYPE, "30"), /*Tablet*/
 128                 },
 129         },
 130         {
 131                 .matches = {
 132                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 133                         DMI_MATCH(DMI_CHASSIS_TYPE, "31"), /*Convertible*/
 134                 },
 135         },
 136         {
 137                 .matches = {
 138                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 139                         DMI_MATCH(DMI_CHASSIS_TYPE, "32"), /*Detachable*/
 140                 },
 141         },
 142         {
 143                 .ident = "Dell Computer Corporation",
 144                 .matches = {
 145                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 146                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 147                 },
 148         },
 149         { }
 150 };
 151 MODULE_DEVICE_TABLE(dmi, dell_device_table);
 152
 153 static const struct dmi_system_id dell_quirks[] __initconst = {
 154         {
 155                 .callback = dmi_matched,
 156                 .ident = "Dell Vostro V130",
 157                 .matches = {
 158                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 159                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
 160                 },
 161                 .driver_data = &quirk_dell_vostro_v130,
 162         },
 163         {
 164                 .callback = dmi_matched,
 165                 .ident = "Dell Vostro V131",
 166                 .matches = {
 167                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 168                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 169                 },
 170                 .driver_data = &quirk_dell_vostro_v130,
 171         },
 172         {
 173                 .callback = dmi_matched,
 174                 .ident = "Dell Vostro 3350",
 175                 .matches = {
 176                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 177                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
 178                 },
 179                 .driver_data = &quirk_dell_vostro_v130,
 180         },
 181         {
 182                 .callback = dmi_matched,
 183                 .ident = "Dell Vostro 3555",
 184                 .matches = {
 185                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 186                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
 187                 },
 188                 .driver_data = &quirk_dell_vostro_v130,
 189         },
 190         {
 191                 .callback = dmi_matched,
 192                 .ident = "Dell Inspiron N311z",
 193                 .matches = {
 194                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 195                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
 196                 },
 197                 .driver_data = &quirk_dell_vostro_v130,
 198         },
 199         {
 200                 .callback = dmi_matched,
 201                 .ident = "Dell Inspiron M5110",
 202                 .matches = {
 203                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 204                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
 205                 },
 206                 .driver_data = &quirk_dell_vostro_v130,
 207         },
 208         {
 209                 .callback = dmi_matched,
 210                 .ident = "Dell Vostro 3360",
 211                 .matches = {
 212                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 213                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
 214                 },
 215                 .driver_data = &quirk_dell_vostro_v130,
 216         },
 217         {
 218                 .callback = dmi_matched,
 219                 .ident = "Dell Vostro 3460",
 220                 .matches = {
 221                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 222                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"),
 223                 },
 224                 .driver_data = &quirk_dell_vostro_v130,
 225         },
 226         {
 227                 .callback = dmi_matched,
 228                 .ident = "Dell Vostro 3560",
 229                 .matches = {
 230                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 231                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"),
 232                 },
 233                 .driver_data = &quirk_dell_vostro_v130,
 234         },
 235         {
 236                 .callback = dmi_matched,
 237                 .ident = "Dell Vostro 3450",
 238                 .matches = {
 239                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 240                         DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"),
 241                 },
 242                 .driver_data = &quirk_dell_vostro_v130,
 243         },
 244         {
 245                 .callback = dmi_matched,
 246                 .ident = "Dell Inspiron 5420",
 247                 .matches = {
 248                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 249                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"),
 250                 },
 251                 .driver_data = &quirk_dell_vostro_v130,
 252         },
 253         {
 254                 .callback = dmi_matched,
 255                 .ident = "Dell Inspiron 5520",
 256                 .matches = {
 257                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 258                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"),
 259                 },
 260                 .driver_data = &quirk_dell_vostro_v130,
 261         },
 262         {
 263                 .callback = dmi_matched,
 264                 .ident = "Dell Inspiron 5720",
 265                 .matches = {
 266                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 267                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"),
 268                 },
 269                 .driver_data = &quirk_dell_vostro_v130,
 270         },
 271         {
 272                 .callback = dmi_matched,
 273                 .ident = "Dell Inspiron 7420",
 274                 .matches = {
 275                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 276                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"),
 277                 },
 278                 .driver_data = &quirk_dell_vostro_v130,
 279         },
 280         {
 281                 .callback = dmi_matched,
 282                 .ident = "Dell Inspiron 7520",
 283                 .matches = {
 284                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 285                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
 286                 },
 287                 .driver_data = &quirk_dell_vostro_v130,
 288         },
 289         {
 290                 .callback = dmi_matched,
 291                 .ident = "Dell Inspiron 7720",
 292                 .matches = {
 293                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 294                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
 295                 },
 296                 .driver_data = &quirk_dell_vostro_v130,
 297         },
 298         {
 299                 .callback = dmi_matched,
 300                 .ident = "Dell XPS13 9333",
 301                 .matches = {
 302                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 303                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
 304                 },
 305                 .driver_data = &quirk_dell_xps13_9333,
 306         },
 307         {
 308                 .callback = dmi_matched,
 309                 .ident = "Dell XPS 13 9370",
 310                 .matches = {
 311                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 312                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS 13 9370"),
 313                 },
 314                 .driver_data = &quirk_dell_xps13_9370,
 315         },
 316         {
 317                 .callback = dmi_matched,
 318                 .ident = "Dell Latitude E6410",
 319                 .matches = {
 320                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 321                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6410"),
 322                 },
 323                 .driver_data = &quirk_dell_latitude_e6410,
 324         },
 325         {
 326                 .callback = dmi_matched,
 327                 .ident = "Dell Inspiron 1012",
 328                 .matches = {
 329                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 330                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"),
 331                 },
 332                 .driver_data = &quirk_dell_inspiron_1012,
 333         },
 334         {
 335                 .callback = dmi_matched,
 336                 .ident = "Dell Inspiron 1018",
 337                 .matches = {
 338                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 339                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1018"),
 340                 },
 341                 .driver_data = &quirk_dell_inspiron_1012,
 342         },
 343         {
 344                 .callback = dmi_matched,
 345                 .ident = "Dell Latitude 7520",
 346                 .matches = {
 347                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 348                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude 7520"),
 349                 },
 350                 .driver_data = &quirk_dell_latitude_7520,
 351         },
 352         { }
 353 };
 354
 355 static void dell_fill_request(struct calling_interface_buffer *buffer,
 356                                u32 arg0, u32 arg1, u32 arg2, u32 arg3)
 357 {
 358         memset(buffer, 0, sizeof(struct calling_interface_buffer));
 359         buffer->input[0] = arg0;
 360         buffer->input[1] = arg1;
 361         buffer->input[2] = arg2;
 362         buffer->input[3] = arg3;
 363 }
 364
 365 static int dell_send_request(struct calling_interface_buffer *buffer,
 366                              u16 class, u16 select)
 367 {
 368         int ret;
 369
 370         buffer->cmd_class = class;
 371         buffer->cmd_select = select;
 372         ret = dell_smbios_call(buffer);
 373         if (ret != 0)
 374                 return ret;
 375         return dell_smbios_error(buffer->output[0]);
 376 }
 377
 378 /*
 379  * Derived from information in smbios-wireless-ctl:
 380  *
 381  * cbSelect 17, Value 11
 382  *
 383  * Return Wireless Info
 384  * cbArg1, byte0 = 0x00
 385  *
 386  *     cbRes1 Standard return codes (0, -1, -2)
 387  *     cbRes2 Info bit flags:
 388  *
 389  *     0 Hardware switch supported (1)
 390  *     1 WiFi locator supported (1)
 391  *     2 WLAN supported (1)
 392  *     3 Bluetooth (BT) supported (1)
 393  *     4 WWAN supported (1)
 394  *     5 Wireless KBD supported (1)
 395  *     6 Uw b supported (1)
 396  *     7 WiGig supported (1)
 397  *     8 WLAN installed (1)
 398  *     9 BT installed (1)
 399  *     10 WWAN installed (1)
 400  *     11 Uw b installed (1)
 401  *     12 WiGig installed (1)
 402  *     13-15 Reserved (0)
 403  *     16 Hardware (HW) switch is On (1)
 404  *     17 WLAN disabled (1)
 405  *     18 BT disabled (1)
 406  *     19 WWAN disabled (1)
 407  *     20 Uw b disabled (1)
 408  *     21 WiGig disabled (1)
 409  *     20-31 Reserved (0)
 410  *
 411  *     cbRes3 NVRAM size in bytes
 412  *     cbRes4, byte 0 NVRAM format version number
 413  *
 414  *
 415  * Set QuickSet Radio Disable Flag
 416  *     cbArg1, byte0 = 0x01
 417  *     cbArg1, byte1
 418  *     Radio ID     value:
 419  *     0        Radio Status
 420  *     1        WLAN ID
 421  *     2        BT ID
 422  *     3        WWAN ID
 423  *     4        UWB ID
 424  *     5        WIGIG ID
 425  *     cbArg1, byte2    Flag bits:
 426  *             0 QuickSet disables radio (1)
 427  *             1-7 Reserved (0)
 428  *
 429  *     cbRes1    Standard return codes (0, -1, -2)
 430  *     cbRes2    QuickSet (QS) radio disable bit map:
 431  *     0 QS disables WLAN
 432  *     1 QS disables BT
 433  *     2 QS disables WWAN
 434  *     3 QS disables UWB
 435  *     4 QS disables WIGIG
 436  *     5-31 Reserved (0)
 437  *
 438  * Wireless Switch Configuration
 439  *     cbArg1, byte0 = 0x02
 440  *
 441  *     cbArg1, byte1
 442  *     Subcommand:
 443  *     0 Get config
 444  *     1 Set config
 445  *     2 Set WiFi locator enable/disable
 446  *     cbArg1,byte2
 447  *     Switch settings (if byte 1==1):
 448  *     0 WLAN sw itch control (1)
 449  *     1 BT sw itch control (1)
 450  *     2 WWAN sw itch control (1)
 451  *     3 UWB sw itch control (1)
 452  *     4 WiGig sw itch control (1)
 453  *     5-7 Reserved (0)
 454  *    cbArg1, byte2 Enable bits (if byte 1==2):
 455  *     0 Enable WiFi locator (1)
 456  *
 457  *    cbRes1     Standard return codes (0, -1, -2)
 458  *    cbRes2 QuickSet radio disable bit map:
 459  *     0 WLAN controlled by sw itch (1)
 460  *     1 BT controlled by sw itch (1)
 461  *     2 WWAN controlled by sw itch (1)
 462  *     3 UWB controlled by sw itch (1)
 463  *     4 WiGig controlled by sw itch (1)
 464  *     5-6 Reserved (0)
 465  *     7 Wireless sw itch config locked (1)
 466  *     8 WiFi locator enabled (1)
 467  *     9-14 Reserved (0)
 468  *     15 WiFi locator setting locked (1)
 469  *     16-31 Reserved (0)
 470  *
 471  * Read Local Config Data (LCD)
 472  *     cbArg1, byte0 = 0x10
 473  *     cbArg1, byte1 NVRAM index low byte
 474  *     cbArg1, byte2 NVRAM index high byte
 475  *     cbRes1 Standard return codes (0, -1, -2)
 476  *     cbRes2 4 bytes read from LCD[index]
 477  *     cbRes3 4 bytes read from LCD[index+4]
 478  *     cbRes4 4 bytes read from LCD[index+8]
 479  *
 480  * Write Local Config Data (LCD)
 481  *     cbArg1, byte0 = 0x11
 482  *     cbArg1, byte1 NVRAM index low byte
 483  *     cbArg1, byte2 NVRAM index high byte
 484  *     cbArg2 4 bytes to w rite at LCD[index]
 485  *     cbArg3 4 bytes to w rite at LCD[index+4]
 486  *     cbArg4 4 bytes to w rite at LCD[index+8]
 487  *     cbRes1 Standard return codes (0, -1, -2)
 488  *
 489  * Populate Local Config Data from NVRAM
 490  *     cbArg1, byte0 = 0x12
 491  *     cbRes1 Standard return codes (0, -1, -2)
 492  *
 493  * Commit Local Config Data to NVRAM
 494  *     cbArg1, byte0 = 0x13
 495  *     cbRes1 Standard return codes (0, -1, -2)
 496  */
 497
 498 static int dell_rfkill_set(void *data, bool blocked)
 499 {
 500         int disable = blocked ? 1 : 0;
 501         unsigned long radio = (unsigned long)data;
 502         int hwswitch_bit = (unsigned long)data - 1;
 503         struct calling_interface_buffer buffer;
 504         int hwswitch;
 505         int status;
 506         int ret;
 507
 508         dell_fill_request(&buffer, 0, 0, 0, 0);
 509         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 510         if (ret)
 511                 return ret;
 512         status = buffer.output[1];
 513
 514         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 515         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 516         if (ret)
 517                 return ret;
 518         hwswitch = buffer.output[1];
 519
 520         /* If the hardware switch controls this radio, and the hardware
 521            switch is disabled, always disable the radio */
 522         if (ret == 0 && (hwswitch & BIT(hwswitch_bit)) &&
 523             (status & BIT(0)) && !(status & BIT(16)))
 524                 disable = 1;
 525
 526         dell_fill_request(&buffer, 1 | (radio<<8) | (disable << 16), 0, 0, 0);
 527         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 528         return ret;
 529 }
 530
 531 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
 532                                         int status)
 533 {
 534         if (status & BIT(0)) {
 535                 /* Has hw-switch, sync sw_state to BIOS */
 536                 struct calling_interface_buffer buffer;
 537                 int block = rfkill_blocked(rfkill);
 538                 dell_fill_request(&buffer,
 539                                    1 | (radio << 8) | (block << 16), 0, 0, 0);
 540                 dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 541         } else {
 542                 /* No hw-switch, sync BIOS state to sw_state */
 543                 rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
 544         }
 545 }
 546
 547 static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
 548                                         int status, int hwswitch)
 549 {
 550         if (hwswitch & (BIT(radio - 1)))
 551                 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
 552 }
 553
 554 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 555 {
 556         int radio = ((unsigned long)data & 0xF);
 557         struct calling_interface_buffer buffer;
 558         int hwswitch;
 559         int status;
 560         int ret;
 561
 562         dell_fill_request(&buffer, 0, 0, 0, 0);
 563         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 564         status = buffer.output[1];
 565
 566         if (ret != 0 || !(status & BIT(0))) {
 567                 return;
 568         }
 569
 570         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 571         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 572         hwswitch = buffer.output[1];
 573
 574         if (ret != 0)
 575                 return;
 576
 577         dell_rfkill_update_hw_state(rfkill, radio, status, hwswitch);
 578 }
 579
 580 static const struct rfkill_ops dell_rfkill_ops = {
 581         .set_block = dell_rfkill_set,
 582         .query = dell_rfkill_query,
 583 };
 584
 585 static struct dentry *dell_laptop_dir;
 586
 587 static int dell_debugfs_show(struct seq_file *s, void *data)
 588 {
 589         struct calling_interface_buffer buffer;
 590         int hwswitch_state;
 591         int hwswitch_ret;
 592         int status;
 593         int ret;
 594
 595         dell_fill_request(&buffer, 0, 0, 0, 0);
 596         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 597         if (ret)
 598                 return ret;
 599         status = buffer.output[1];
 600
 601         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 602         hwswitch_ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 603         if (hwswitch_ret)
 604                 return hwswitch_ret;
 605         hwswitch_state = buffer.output[1];
 606
 607         seq_printf(s, "return:\t%d\n", ret);
 608         seq_printf(s, "status:\t0x%X\n", status);
 609         seq_printf(s, "Bit 0 : Hardware switch supported:   %lu\n",
 610                    status & BIT(0));
 611         seq_printf(s, "Bit 1 : Wifi locator supported:      %lu\n",
 612                   (status & BIT(1)) >> 1);
 613         seq_printf(s, "Bit 2 : Wifi is supported:           %lu\n",
 614                   (status & BIT(2)) >> 2);
 615         seq_printf(s, "Bit 3 : Bluetooth is supported:      %lu\n",
 616                   (status & BIT(3)) >> 3);
 617         seq_printf(s, "Bit 4 : WWAN is supported:           %lu\n",
 618                   (status & BIT(4)) >> 4);
 619         seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
 620                   (status & BIT(5)) >> 5);
 621         seq_printf(s, "Bit 6 : UWB supported:               %lu\n",
 622                   (status & BIT(6)) >> 6);
 623         seq_printf(s, "Bit 7 : WiGig supported:             %lu\n",
 624                   (status & BIT(7)) >> 7);
 625         seq_printf(s, "Bit 8 : Wifi is installed:           %lu\n",
 626                   (status & BIT(8)) >> 8);
 627         seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
 628                   (status & BIT(9)) >> 9);
 629         seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
 630                   (status & BIT(10)) >> 10);
 631         seq_printf(s, "Bit 11: UWB installed:               %lu\n",
 632                   (status & BIT(11)) >> 11);
 633         seq_printf(s, "Bit 12: WiGig installed:             %lu\n",
 634                   (status & BIT(12)) >> 12);
 635
 636         seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
 637                   (status & BIT(16)) >> 16);
 638         seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
 639                   (status & BIT(17)) >> 17);
 640         seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
 641                   (status & BIT(18)) >> 18);
 642         seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
 643                   (status & BIT(19)) >> 19);
 644         seq_printf(s, "Bit 20: UWB is blocked:              %lu\n",
 645                   (status & BIT(20)) >> 20);
 646         seq_printf(s, "Bit 21: WiGig is blocked:            %lu\n",
 647                   (status & BIT(21)) >> 21);
 648
 649         seq_printf(s, "\nhwswitch_return:\t%d\n", hwswitch_ret);
 650         seq_printf(s, "hwswitch_state:\t0x%X\n", hwswitch_state);
 651         seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
 652                    hwswitch_state & BIT(0));
 653         seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
 654                    (hwswitch_state & BIT(1)) >> 1);
 655         seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
 656                    (hwswitch_state & BIT(2)) >> 2);
 657         seq_printf(s, "Bit 3 : UWB controlled by switch:       %lu\n",
 658                    (hwswitch_state & BIT(3)) >> 3);
 659         seq_printf(s, "Bit 4 : WiGig controlled by switch:     %lu\n",
 660                    (hwswitch_state & BIT(4)) >> 4);
 661         seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
 662                    (hwswitch_state & BIT(7)) >> 7);
 663         seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
 664                    (hwswitch_state & BIT(8)) >> 8);
 665         seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
 666                    (hwswitch_state & BIT(15)) >> 15);
 667
 668         return 0;
 669 }
 670 DEFINE_SHOW_ATTRIBUTE(dell_debugfs);
 671
 672 static void dell_update_rfkill(struct work_struct *ignored)
 673 {
 674         struct calling_interface_buffer buffer;
 675         int hwswitch = 0;
 676         int status;
 677         int ret;
 678
 679         dell_fill_request(&buffer, 0, 0, 0, 0);
 680         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 681         status = buffer.output[1];
 682
 683         if (ret != 0)
 684                 return;
 685
 686         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 687         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 688
 689         if (ret == 0 && (status & BIT(0)))
 690                 hwswitch = buffer.output[1];
 691
 692         if (wifi_rfkill) {
 693                 dell_rfkill_update_hw_state(wifi_rfkill, 1, status, hwswitch);
 694                 dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
 695         }
 696         if (bluetooth_rfkill) {
 697                 dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status,
 698                                             hwswitch);
 699                 dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
 700         }
 701         if (wwan_rfkill) {
 702                 dell_rfkill_update_hw_state(wwan_rfkill, 3, status, hwswitch);
 703                 dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
 704         }
 705 }
 706 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
 707
 708 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
 709                               struct serio *port)
 710 {
 711         static bool extended;
 712
 713         if (str & I8042_STR_AUXDATA)
 714                 return false;
 715
 716         if (unlikely(data == 0xe0)) {
 717                 extended = true;
 718                 return false;
 719         } else if (unlikely(extended)) {
 720                 switch (data) {
 721                 case 0x8:
 722                         schedule_delayed_work(&dell_rfkill_work,
 723                                               round_jiffies_relative(HZ / 4));
 724                         break;
 725                 }
 726                 extended = false;
 727         }
 728
 729         return false;
 730 }
 731
 732 static int (*dell_rbtn_notifier_register_func)(struct notifier_block *);
 733 static int (*dell_rbtn_notifier_unregister_func)(struct notifier_block *);
 734
 735 static int dell_laptop_rbtn_notifier_call(struct notifier_block *nb,
 736                                           unsigned long action, void *data)
 737 {
 738         schedule_delayed_work(&dell_rfkill_work, 0);
 739         return NOTIFY_OK;
 740 }
 741
 742 static struct notifier_block dell_laptop_rbtn_notifier = {
 743         .notifier_call = dell_laptop_rbtn_notifier_call,
 744 };
 745
 746 static int __init dell_setup_rfkill(void)
 747 {
 748         struct calling_interface_buffer buffer;
 749         int status, ret, whitelisted;
 750         const char *product;
 751
 752         /*
 753          * rfkill support causes trouble on various models, mostly Inspirons.
 754          * So we whitelist certain series, and don't support rfkill on others.
 755          */
 756         whitelisted = 0;
 757         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 758         if (product &&  (strncmp(product, "Latitude", 8) == 0 ||
 759                          strncmp(product, "Precision", 9) == 0))
 760                 whitelisted = 1;
 761         if (!force_rfkill && !whitelisted)
 762                 return 0;
 763
 764         dell_fill_request(&buffer, 0, 0, 0, 0);
 765         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 766         status = buffer.output[1];
 767
 768         /* dell wireless info smbios call is not supported */
 769         if (ret != 0)
 770                 return 0;
 771
 772         /* rfkill is only tested on laptops with a hwswitch */
 773         if (!(status & BIT(0)) && !force_rfkill)
 774                 return 0;
 775
 776         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 777                 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
 778                                            RFKILL_TYPE_WLAN,
 779                                            &dell_rfkill_ops, (void *) 1);
 780                 if (!wifi_rfkill) {
 781                         ret = -ENOMEM;
 782                         goto err_wifi;
 783                 }
 784                 ret = rfkill_register(wifi_rfkill);
 785                 if (ret)
 786                         goto err_wifi;
 787         }
 788
 789         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 790                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
 791                                                 &platform_device->dev,
 792                                                 RFKILL_TYPE_BLUETOOTH,
 793                                                 &dell_rfkill_ops, (void *) 2);
 794                 if (!bluetooth_rfkill) {
 795                         ret = -ENOMEM;
 796                         goto err_bluetooth;
 797                 }
 798                 ret = rfkill_register(bluetooth_rfkill);
 799                 if (ret)
 800                         goto err_bluetooth;
 801         }
 802
 803         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 804                 wwan_rfkill = rfkill_alloc("dell-wwan",
 805                                            &platform_device->dev,
 806                                            RFKILL_TYPE_WWAN,
 807                                            &dell_rfkill_ops, (void *) 3);
 808                 if (!wwan_rfkill) {
 809                         ret = -ENOMEM;
 810                         goto err_wwan;
 811                 }
 812                 ret = rfkill_register(wwan_rfkill);
 813                 if (ret)
 814                         goto err_wwan;
 815         }
 816
 817         /*
 818          * Dell Airplane Mode Switch driver (dell-rbtn) supports ACPI devices
 819          * which can receive events from HW slider switch.
 820          *
 821          * Dell SMBIOS on whitelisted models supports controlling radio devices
 822          * but does not support receiving HW button switch events. We can use
 823          * i8042 filter hook function to receive keyboard data and handle
 824          * keycode for HW button.
 825          *
 826          * So if it is possible we will use Dell Airplane Mode Switch ACPI
 827          * driver for receiving HW events and Dell SMBIOS for setting rfkill
 828          * states. If ACPI driver or device is not available we will fallback to
 829          * i8042 filter hook function.
 830          *
 831          * To prevent duplicate rfkill devices which control and do same thing,
 832          * dell-rbtn driver will automatically remove its own rfkill devices
 833          * once function dell_rbtn_notifier_register() is called.
 834          */
 835
 836         dell_rbtn_notifier_register_func =
 837                 symbol_request(dell_rbtn_notifier_register);
 838         if (dell_rbtn_notifier_register_func) {
 839                 dell_rbtn_notifier_unregister_func =
 840                         symbol_request(dell_rbtn_notifier_unregister);
 841                 if (!dell_rbtn_notifier_unregister_func) {
 842                         symbol_put(dell_rbtn_notifier_register);
 843                         dell_rbtn_notifier_register_func = NULL;
 844                 }
 845         }
 846
 847         if (dell_rbtn_notifier_register_func) {
 848                 ret = dell_rbtn_notifier_register_func(
 849                         &dell_laptop_rbtn_notifier);
 850                 symbol_put(dell_rbtn_notifier_register);
 851                 dell_rbtn_notifier_register_func = NULL;
 852                 if (ret != 0) {
 853                         symbol_put(dell_rbtn_notifier_unregister);
 854                         dell_rbtn_notifier_unregister_func = NULL;
 855                 }
 856         } else {
 857                 pr_info("Symbols from dell-rbtn acpi driver are not available\n");
 858                 ret = -ENODEV;
 859         }
 860
 861         if (ret == 0) {
 862                 pr_info("Using dell-rbtn acpi driver for receiving events\n");
 863         } else if (ret != -ENODEV) {
 864                 pr_warn("Unable to register dell rbtn notifier\n");
 865                 goto err_filter;
 866         } else {
 867                 ret = i8042_install_filter(dell_laptop_i8042_filter);
 868                 if (ret) {
 869                         pr_warn("Unable to install key filter\n");
 870                         goto err_filter;
 871                 }
 872                 pr_info("Using i8042 filter function for receiving events\n");
 873         }
 874
 875         return 0;
 876 err_filter:
 877         if (wwan_rfkill)
 878                 rfkill_unregister(wwan_rfkill);
 879 err_wwan:
 880         rfkill_destroy(wwan_rfkill);
 881         if (bluetooth_rfkill)
 882                 rfkill_unregister(bluetooth_rfkill);
 883 err_bluetooth:
 884         rfkill_destroy(bluetooth_rfkill);
 885         if (wifi_rfkill)
 886                 rfkill_unregister(wifi_rfkill);
 887 err_wifi:
 888         rfkill_destroy(wifi_rfkill);
 889
 890         return ret;
 891 }
 892
 893 static void dell_cleanup_rfkill(void)
 894 {
 895         if (dell_rbtn_notifier_unregister_func) {
 896                 dell_rbtn_notifier_unregister_func(&dell_laptop_rbtn_notifier);
 897                 symbol_put(dell_rbtn_notifier_unregister);
 898                 dell_rbtn_notifier_unregister_func = NULL;
 899         } else {
 900                 i8042_remove_filter(dell_laptop_i8042_filter);
 901         }
 902         cancel_delayed_work_sync(&dell_rfkill_work);
 903         if (wifi_rfkill) {
 904                 rfkill_unregister(wifi_rfkill);
 905                 rfkill_destroy(wifi_rfkill);
 906         }
 907         if (bluetooth_rfkill) {
 908                 rfkill_unregister(bluetooth_rfkill);
 909                 rfkill_destroy(bluetooth_rfkill);
 910         }
 911         if (wwan_rfkill) {
 912                 rfkill_unregister(wwan_rfkill);
 913                 rfkill_destroy(wwan_rfkill);
 914         }
 915 }
 916
 917 static int dell_send_intensity(struct backlight_device *bd)
 918 {
 919         struct calling_interface_buffer buffer;
 920         struct calling_interface_token *token;
 921         int ret;
 922
 923         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
 924         if (!token)
 925                 return -ENODEV;
 926
 927         dell_fill_request(&buffer,
 928                            token->location, bd->props.brightness, 0, 0);
 929         if (power_supply_is_system_supplied() > 0)
 930                 ret = dell_send_request(&buffer,
 931                                         CLASS_TOKEN_WRITE, SELECT_TOKEN_AC);
 932         else
 933                 ret = dell_send_request(&buffer,
 934                                         CLASS_TOKEN_WRITE, SELECT_TOKEN_BAT);
 935
 936         return ret;
 937 }
 938
 939 static int dell_get_intensity(struct backlight_device *bd)
 940 {
 941         struct calling_interface_buffer buffer;
 942         struct calling_interface_token *token;
 943         int ret;
 944
 945         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
 946         if (!token)
 947                 return -ENODEV;
 948
 949         dell_fill_request(&buffer, token->location, 0, 0, 0);
 950         if (power_supply_is_system_supplied() > 0)
 951                 ret = dell_send_request(&buffer,
 952                                         CLASS_TOKEN_READ, SELECT_TOKEN_AC);
 953         else
 954                 ret = dell_send_request(&buffer,
 955                                         CLASS_TOKEN_READ, SELECT_TOKEN_BAT);
 956
 957         if (ret == 0)
 958                 ret = buffer.output[1];
 959
 960         return ret;
 961 }
 962
 963 static const struct backlight_ops dell_ops = {
 964         .get_brightness = dell_get_intensity,
 965         .update_status  = dell_send_intensity,
 966 };
 967
 968 static void touchpad_led_on(void)
 969 {
 970         int command = 0x97;
 971         char data = 1;
 972         i8042_command(&data, command | 1 << 12);
 973 }
 974
 975 static void touchpad_led_off(void)
 976 {
 977         int command = 0x97;
 978         char data = 2;
 979         i8042_command(&data, command | 1 << 12);
 980 }
 981
 982 static void touchpad_led_set(struct led_classdev *led_cdev,
 983         enum led_brightness value)
 984 {
 985         if (value > 0)
 986                 touchpad_led_on();
 987         else
 988                 touchpad_led_off();
 989 }
 990
 991 static struct led_classdev touchpad_led = {
 992         .name = "dell-laptop::touchpad",
 993         .brightness_set = touchpad_led_set,
 994         .flags = LED_CORE_SUSPENDRESUME,
 995 };
 996
 997 static int __init touchpad_led_init(struct device *dev)
 998 {
 999         return led_classdev_register(dev, &touchpad_led);
1000 }
1001
1002 static void touchpad_led_exit(void)
1003 {
1004         led_classdev_unregister(&touchpad_led);
1005 }
1006
1007 /*
1008  * Derived from information in smbios-keyboard-ctl:
1009  *
1010  * cbClass 4
1011  * cbSelect 11
1012  * Keyboard illumination
1013  * cbArg1 determines the function to be performed
1014  *
1015  * cbArg1 0x0 = Get Feature Information
1016  *  cbRES1         Standard return codes (0, -1, -2)
1017  *  cbRES2, word0  Bitmap of user-selectable modes
1018  *     bit 0     Always off (All systems)
1019  *     bit 1     Always on (Travis ATG, Siberia)
1020  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1021  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1022  *     bit 4     Auto: Input-activity-based On; input-activity based Off
1023  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1024  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1025  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1026  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1027  *     bits 9-15 Reserved for future use
1028  *  cbRES2, byte2  Reserved for future use
1029  *  cbRES2, byte3  Keyboard illumination type
1030  *     0         Reserved
1031  *     1         Tasklight
1032  *     2         Backlight
1033  *     3-255     Reserved for future use
1034  *  cbRES3, byte0  Supported auto keyboard illumination trigger bitmap.
1035  *     bit 0     Any keystroke
1036  *     bit 1     Touchpad activity
1037  *     bit 2     Pointing stick
1038  *     bit 3     Any mouse
1039  *     bits 4-7  Reserved for future use
1040  *  cbRES3, byte1  Supported timeout unit bitmap
1041  *     bit 0     Seconds
1042  *     bit 1     Minutes
1043  *     bit 2     Hours
1044  *     bit 3     Days
1045  *     bits 4-7  Reserved for future use
1046  *  cbRES3, byte2  Number of keyboard light brightness levels
1047  *  cbRES4, byte0  Maximum acceptable seconds value (0 if seconds not supported).
1048  *  cbRES4, byte1  Maximum acceptable minutes value (0 if minutes not supported).
1049  *  cbRES4, byte2  Maximum acceptable hours value (0 if hours not supported).
1050  *  cbRES4, byte3  Maximum acceptable days value (0 if days not supported)
1051  *
1052  * cbArg1 0x1 = Get Current State
1053  *  cbRES1         Standard return codes (0, -1, -2)
1054  *  cbRES2, word0  Bitmap of current mode state
1055  *     bit 0     Always off (All systems)
1056  *     bit 1     Always on (Travis ATG, Siberia)
1057  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1058  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1059  *     bit 4     Auto: Input-activity-based On; input-activity based Off
1060  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1061  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1062  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1063  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1064  *     bits 9-15 Reserved for future use
1065  *     Note: Only One bit can be set
1066  *  cbRES2, byte2  Currently active auto keyboard illumination triggers.
1067  *     bit 0     Any keystroke
1068  *     bit 1     Touchpad activity
1069  *     bit 2     Pointing stick
1070  *     bit 3     Any mouse
1071  *     bits 4-7  Reserved for future use
1072  *  cbRES2, byte3  Current Timeout on battery
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 byte
1080  *     are set upon return from the [Get feature information] call.
1081  *  cbRES3, byte0  Current setting of ALS value that turns the light on or off.
1082  *  cbRES3, byte1  Current ALS reading
1083  *  cbRES3, byte2  Current keyboard light level.
1084  *  cbRES3, byte3  Current timeout on AC Power
1085  *     bits 7:6  Timeout units indicator:
1086  *     00b       Seconds
1087  *     01b       Minutes
1088  *     10b       Hours
1089  *     11b       Days
1090  *     Bits 5:0  Timeout value (0-63) in sec/min/hr/day
1091  *     NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte2
1092  *     are set upon return from the upon return from the [Get Feature information] call.
1093  *
1094  * cbArg1 0x2 = Set New State
1095  *  cbRES1         Standard return codes (0, -1, -2)
1096  *  cbArg2, word0  Bitmap of current mode state
1097  *     bit 0     Always off (All systems)
1098  *     bit 1     Always on (Travis ATG, Siberia)
1099  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1100  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1101  *     bit 4     Auto: Input-activity-based On; input-activity based Off
1102  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1103  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1104  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1105  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1106  *     bits 9-15 Reserved for future use
1107  *     Note: Only One bit can be set
1108  *  cbArg2, byte2  Desired auto keyboard illumination triggers. Must remain inactive to allow
1109  *                 keyboard to turn off automatically.
1110  *     bit 0     Any keystroke
1111  *     bit 1     Touchpad activity
1112  *     bit 2     Pointing stick
1113  *     bit 3     Any mouse
1114  *     bits 4-7  Reserved for future use
1115  *  cbArg2, byte3  Desired Timeout on battery
1116  *     bits 7:6  Timeout units indicator:
1117  *     00b       Seconds
1118  *     01b       Minutes
1119  *     10b       Hours
1120  *     11b       Days
1121  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1122  *  cbArg3, byte0  Desired setting of ALS value that turns the light on or off.
1123  *  cbArg3, byte2  Desired keyboard light level.
1124  *  cbArg3, byte3  Desired Timeout on AC power
1125  *     bits 7:6  Timeout units indicator:
1126  *     00b       Seconds
1127  *     01b       Minutes
1128  *     10b       Hours
1129  *     11b       Days
1130  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1131  */
1132
1133
1134 enum kbd_timeout_unit {
1135         KBD_TIMEOUT_SECONDS = 0,
1136         KBD_TIMEOUT_MINUTES,
1137         KBD_TIMEOUT_HOURS,
1138         KBD_TIMEOUT_DAYS,
1139 };
1140
1141 enum kbd_mode_bit {
1142         KBD_MODE_BIT_OFF = 0,
1143         KBD_MODE_BIT_ON,
1144         KBD_MODE_BIT_ALS,
1145         KBD_MODE_BIT_TRIGGER_ALS,
1146         KBD_MODE_BIT_TRIGGER,
1147         KBD_MODE_BIT_TRIGGER_25,
1148         KBD_MODE_BIT_TRIGGER_50,
1149         KBD_MODE_BIT_TRIGGER_75,
1150         KBD_MODE_BIT_TRIGGER_100,
1151 };
1152
1153 #define kbd_is_als_mode_bit(bit) \
1154         ((bit) == KBD_MODE_BIT_ALS || (bit) == KBD_MODE_BIT_TRIGGER_ALS)
1155 #define kbd_is_trigger_mode_bit(bit) \
1156         ((bit) >= KBD_MODE_BIT_TRIGGER_ALS && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1157 #define kbd_is_level_mode_bit(bit) \
1158         ((bit) >= KBD_MODE_BIT_TRIGGER_25 && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1159
1160 struct kbd_info {
1161         u16 modes;
1162         u8 type;
1163         u8 triggers;
1164         u8 levels;
1165         u8 seconds;
1166         u8 minutes;
1167         u8 hours;
1168         u8 days;
1169 };
1170
1171 struct kbd_state {
1172         u8 mode_bit;
1173         u8 triggers;
1174         u8 timeout_value;
1175         u8 timeout_unit;
1176         u8 timeout_value_ac;
1177         u8 timeout_unit_ac;
1178         u8 als_setting;
1179         u8 als_value;
1180         u8 level;
1181 };
1182
1183 static const int kbd_tokens[] = {
1184         KBD_LED_OFF_TOKEN,
1185         KBD_LED_AUTO_25_TOKEN,
1186         KBD_LED_AUTO_50_TOKEN,
1187         KBD_LED_AUTO_75_TOKEN,
1188         KBD_LED_AUTO_100_TOKEN,
1189         KBD_LED_ON_TOKEN,
1190 };
1191
1192 static u16 kbd_token_bits;
1193
1194 static struct kbd_info kbd_info;
1195 static bool kbd_als_supported;
1196 static bool kbd_triggers_supported;
1197 static bool kbd_timeout_ac_supported;
1198
1199 static u8 kbd_mode_levels[16];
1200 static int kbd_mode_levels_count;
1201
1202 static u8 kbd_previous_level;
1203 static u8 kbd_previous_mode_bit;
1204
1205 static bool kbd_led_present;
1206 static DEFINE_MUTEX(kbd_led_mutex);
1207 static enum led_brightness kbd_led_level;
1208
1209 /*
1210  * NOTE: there are three ways to set the keyboard backlight level.
1211  * First, via kbd_state.mode_bit (assigning KBD_MODE_BIT_TRIGGER_* value).
1212  * Second, via kbd_state.level (assigning numerical value <= kbd_info.levels).
1213  * Third, via SMBIOS tokens (KBD_LED_* in kbd_tokens)
1214  *
1215  * There are laptops which support only one of these methods. If we want to
1216  * support as many machines as possible we need to implement all three methods.
1217  * The first two methods use the kbd_state structure. The third uses SMBIOS
1218  * tokens. If kbd_info.levels == 0, the machine does not support setting the
1219  * keyboard backlight level via kbd_state.level.
1220  */
1221
1222 static int kbd_get_info(struct kbd_info *info)
1223 {
1224         struct calling_interface_buffer buffer;
1225         u8 units;
1226         int ret;
1227
1228         dell_fill_request(&buffer, 0, 0, 0, 0);
1229         ret = dell_send_request(&buffer,
1230                                 CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1231         if (ret)
1232                 return ret;
1233
1234         info->modes = buffer.output[1] & 0xFFFF;
1235         info->type = (buffer.output[1] >> 24) & 0xFF;
1236         info->triggers = buffer.output[2] & 0xFF;
1237         units = (buffer.output[2] >> 8) & 0xFF;
1238         info->levels = (buffer.output[2] >> 16) & 0xFF;
1239
1240         if (quirks && quirks->kbd_led_levels_off_1 && info->levels)
1241                 info->levels--;
1242
1243         if (units & BIT(0))
1244                 info->seconds = (buffer.output[3] >> 0) & 0xFF;
1245         if (units & BIT(1))
1246                 info->minutes = (buffer.output[3] >> 8) & 0xFF;
1247         if (units & BIT(2))
1248                 info->hours = (buffer.output[3] >> 16) & 0xFF;
1249         if (units & BIT(3))
1250                 info->days = (buffer.output[3] >> 24) & 0xFF;
1251
1252         return ret;
1253 }
1254
1255 static unsigned int kbd_get_max_level(void)
1256 {
1257         if (kbd_info.levels != 0)
1258                 return kbd_info.levels;
1259         if (kbd_mode_levels_count > 0)
1260                 return kbd_mode_levels_count - 1;
1261         return 0;
1262 }
1263
1264 static int kbd_get_level(struct kbd_state *state)
1265 {
1266         int i;
1267
1268         if (kbd_info.levels != 0)
1269                 return state->level;
1270
1271         if (kbd_mode_levels_count > 0) {
1272                 for (i = 0; i < kbd_mode_levels_count; ++i)
1273                         if (kbd_mode_levels[i] == state->mode_bit)
1274                                 return i;
1275                 return 0;
1276         }
1277
1278         return -EINVAL;
1279 }
1280
1281 static int kbd_set_level(struct kbd_state *state, u8 level)
1282 {
1283         if (kbd_info.levels != 0) {
1284                 if (level != 0)
1285                         kbd_previous_level = level;
1286                 if (state->level == level)
1287                         return 0;
1288                 state->level = level;
1289                 if (level != 0 && state->mode_bit == KBD_MODE_BIT_OFF)
1290                         state->mode_bit = kbd_previous_mode_bit;
1291                 else if (level == 0 && state->mode_bit != KBD_MODE_BIT_OFF) {
1292                         kbd_previous_mode_bit = state->mode_bit;
1293                         state->mode_bit = KBD_MODE_BIT_OFF;
1294                 }
1295                 return 0;
1296         }
1297
1298         if (kbd_mode_levels_count > 0 && level < kbd_mode_levels_count) {
1299                 if (level != 0)
1300                         kbd_previous_level = level;
1301                 state->mode_bit = kbd_mode_levels[level];
1302                 return 0;
1303         }
1304
1305         return -EINVAL;
1306 }
1307
1308 static int kbd_get_state(struct kbd_state *state)
1309 {
1310         struct calling_interface_buffer buffer;
1311         int ret;
1312
1313         dell_fill_request(&buffer, 0x1, 0, 0, 0);
1314         ret = dell_send_request(&buffer,
1315                                 CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1316         if (ret)
1317                 return ret;
1318
1319         state->mode_bit = ffs(buffer.output[1] & 0xFFFF);
1320         if (state->mode_bit != 0)
1321                 state->mode_bit--;
1322
1323         state->triggers = (buffer.output[1] >> 16) & 0xFF;
1324         state->timeout_value = (buffer.output[1] >> 24) & 0x3F;
1325         state->timeout_unit = (buffer.output[1] >> 30) & 0x3;
1326         state->als_setting = buffer.output[2] & 0xFF;
1327         state->als_value = (buffer.output[2] >> 8) & 0xFF;
1328         state->level = (buffer.output[2] >> 16) & 0xFF;
1329         state->timeout_value_ac = (buffer.output[2] >> 24) & 0x3F;
1330         state->timeout_unit_ac = (buffer.output[2] >> 30) & 0x3;
1331
1332         return ret;
1333 }
1334
1335 static int kbd_set_state(struct kbd_state *state)
1336 {
1337         struct calling_interface_buffer buffer;
1338         int ret;
1339         u32 input1;
1340         u32 input2;
1341
1342         input1 = BIT(state->mode_bit) & 0xFFFF;
1343         input1 |= (state->triggers & 0xFF) << 16;
1344         input1 |= (state->timeout_value & 0x3F) << 24;
1345         input1 |= (state->timeout_unit & 0x3) << 30;
1346         input2 = state->als_setting & 0xFF;
1347         input2 |= (state->level & 0xFF) << 16;
1348         input2 |= (state->timeout_value_ac & 0x3F) << 24;
1349         input2 |= (state->timeout_unit_ac & 0x3) << 30;
1350         dell_fill_request(&buffer, 0x2, input1, input2, 0);
1351         ret = dell_send_request(&buffer,
1352                                 CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1353
1354         return ret;
1355 }
1356
1357 static int kbd_set_state_safe(struct kbd_state *state, struct kbd_state *old)
1358 {
1359         int ret;
1360
1361         ret = kbd_set_state(state);
1362         if (ret == 0)
1363                 return 0;
1364
1365         /*
1366          * When setting the new state fails,try to restore the previous one.
1367          * This is needed on some machines where BIOS sets a default state when
1368          * setting a new state fails. This default state could be all off.
1369          */
1370
1371         if (kbd_set_state(old))
1372                 pr_err("Setting old previous keyboard state failed\n");
1373
1374         return ret;
1375 }
1376
1377 static int kbd_set_token_bit(u8 bit)
1378 {
1379         struct calling_interface_buffer buffer;
1380         struct calling_interface_token *token;
1381         int ret;
1382
1383         if (bit >= ARRAY_SIZE(kbd_tokens))
1384                 return -EINVAL;
1385
1386         token = dell_smbios_find_token(kbd_tokens[bit]);
1387         if (!token)
1388                 return -EINVAL;
1389
1390         dell_fill_request(&buffer, token->location, token->value, 0, 0);
1391         ret = dell_send_request(&buffer, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
1392
1393         return ret;
1394 }
1395
1396 static int kbd_get_token_bit(u8 bit)
1397 {
1398         struct calling_interface_buffer buffer;
1399         struct calling_interface_token *token;
1400         int ret;
1401         int val;
1402
1403         if (bit >= ARRAY_SIZE(kbd_tokens))
1404                 return -EINVAL;
1405
1406         token = dell_smbios_find_token(kbd_tokens[bit]);
1407         if (!token)
1408                 return -EINVAL;
1409
1410         dell_fill_request(&buffer, token->location, 0, 0, 0);
1411         ret = dell_send_request(&buffer, CLASS_TOKEN_READ, SELECT_TOKEN_STD);
1412         val = buffer.output[1];
1413
1414         if (ret)
1415                 return ret;
1416
1417         return (val == token->value);
1418 }
1419
1420 static int kbd_get_first_active_token_bit(void)
1421 {
1422         int i;
1423         int ret;
1424
1425         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i) {
1426                 ret = kbd_get_token_bit(i);
1427                 if (ret == 1)
1428                         return i;
1429         }
1430
1431         return ret;
1432 }
1433
1434 static int kbd_get_valid_token_counts(void)
1435 {
1436         return hweight16(kbd_token_bits);
1437 }
1438
1439 static inline int kbd_init_info(void)
1440 {
1441         struct kbd_state state;
1442         int ret;
1443         int i;
1444
1445         ret = kbd_get_info(&kbd_info);
1446         if (ret)
1447                 return ret;
1448
1449         /* NOTE: Old models without KBD_LED_AC_TOKEN token supports only one
1450          *       timeout value which is shared for both battery and AC power
1451          *       settings. So do not try to set AC values on old models.
1452          */
1453         if ((quirks && quirks->kbd_missing_ac_tag) ||
1454             dell_smbios_find_token(KBD_LED_AC_TOKEN))
1455                 kbd_timeout_ac_supported = true;
1456
1457         kbd_get_state(&state);
1458
1459         /* NOTE: timeout value is stored in 6 bits so max value is 63 */
1460         if (kbd_info.seconds > 63)
1461                 kbd_info.seconds = 63;
1462         if (kbd_info.minutes > 63)
1463                 kbd_info.minutes = 63;
1464         if (kbd_info.hours > 63)
1465                 kbd_info.hours = 63;
1466         if (kbd_info.days > 63)
1467                 kbd_info.days = 63;
1468
1469         /* NOTE: On tested machines ON mode did not work and caused
1470          *       problems (turned backlight off) so do not use it
1471          */
1472         kbd_info.modes &= ~BIT(KBD_MODE_BIT_ON);
1473
1474         kbd_previous_level = kbd_get_level(&state);
1475         kbd_previous_mode_bit = state.mode_bit;
1476
1477         if (kbd_previous_level == 0 && kbd_get_max_level() != 0)
1478                 kbd_previous_level = 1;
1479
1480         if (kbd_previous_mode_bit == KBD_MODE_BIT_OFF) {
1481                 kbd_previous_mode_bit =
1482                         ffs(kbd_info.modes & ~BIT(KBD_MODE_BIT_OFF));
1483                 if (kbd_previous_mode_bit != 0)
1484                         kbd_previous_mode_bit--;
1485         }
1486
1487         if (kbd_info.modes & (BIT(KBD_MODE_BIT_ALS) |
1488                               BIT(KBD_MODE_BIT_TRIGGER_ALS)))
1489                 kbd_als_supported = true;
1490
1491         if (kbd_info.modes & (
1492             BIT(KBD_MODE_BIT_TRIGGER_ALS) | BIT(KBD_MODE_BIT_TRIGGER) |
1493             BIT(KBD_MODE_BIT_TRIGGER_25) | BIT(KBD_MODE_BIT_TRIGGER_50) |
1494             BIT(KBD_MODE_BIT_TRIGGER_75) | BIT(KBD_MODE_BIT_TRIGGER_100)
1495            ))
1496                 kbd_triggers_supported = true;
1497
1498         /* kbd_mode_levels[0] is reserved, see below */
1499         for (i = 0; i < 16; ++i)
1500                 if (kbd_is_level_mode_bit(i) && (BIT(i) & kbd_info.modes))
1501                         kbd_mode_levels[1 + kbd_mode_levels_count++] = i;
1502
1503         /*
1504          * Find the first supported mode and assign to kbd_mode_levels[0].
1505          * This should be 0 (off), but we cannot depend on the BIOS to
1506          * support 0.
1507          */
1508         if (kbd_mode_levels_count > 0) {
1509                 for (i = 0; i < 16; ++i) {
1510                         if (BIT(i) & kbd_info.modes) {
1511                                 kbd_mode_levels[0] = i;
1512                                 break;
1513                         }
1514                 }
1515                 kbd_mode_levels_count++;
1516         }
1517
1518         return 0;
1519
1520 }
1521
1522 static inline void kbd_init_tokens(void)
1523 {
1524         int i;
1525
1526         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i)
1527                 if (dell_smbios_find_token(kbd_tokens[i]))
1528                         kbd_token_bits |= BIT(i);
1529 }
1530
1531 static void kbd_init(void)
1532 {
1533         int ret;
1534
1535         if (quirks && quirks->kbd_led_not_present)
1536                 return;
1537
1538         ret = kbd_init_info();
1539         kbd_init_tokens();
1540
1541         /*
1542          * Only supports keyboard backlight when it has at least two modes.
1543          */
1544         if ((ret == 0 && (kbd_info.levels != 0 || kbd_mode_levels_count >= 2))
1545             || kbd_get_valid_token_counts() >= 2)
1546                 kbd_led_present = true;
1547 }
1548
1549 static ssize_t kbd_led_timeout_store(struct device *dev,
1550                                      struct device_attribute *attr,
1551                                      const char *buf, size_t count)
1552 {
1553         struct kbd_state new_state;
1554         struct kbd_state state;
1555         bool convert;
1556         int value;
1557         int ret;
1558         char ch;
1559         u8 unit;
1560         int i;
1561
1562         ret = sscanf(buf, "%d %c", &value, &ch);
1563         if (ret < 1)
1564                 return -EINVAL;
1565         else if (ret == 1)
1566                 ch = 's';
1567
1568         if (value < 0)
1569                 return -EINVAL;
1570
1571         convert = false;
1572
1573         switch (ch) {
1574         case 's':
1575                 if (value > kbd_info.seconds)
1576                         convert = true;
1577                 unit = KBD_TIMEOUT_SECONDS;
1578                 break;
1579         case 'm':
1580                 if (value > kbd_info.minutes)
1581                         convert = true;
1582                 unit = KBD_TIMEOUT_MINUTES;
1583                 break;
1584         case 'h':
1585                 if (value > kbd_info.hours)
1586                         convert = true;
1587                 unit = KBD_TIMEOUT_HOURS;
1588                 break;
1589         case 'd':
1590                 if (value > kbd_info.days)
1591                         convert = true;
1592                 unit = KBD_TIMEOUT_DAYS;
1593                 break;
1594         default:
1595                 return -EINVAL;
1596         }
1597
1598         if (quirks && quirks->needs_kbd_timeouts)
1599                 convert = true;
1600
1601         if (convert) {
1602                 /* Convert value from current units to seconds */
1603                 switch (unit) {
1604                 case KBD_TIMEOUT_DAYS:
1605                         value *= 24;
1606                         fallthrough;
1607                 case KBD_TIMEOUT_HOURS:
1608                         value *= 60;
1609                         fallthrough;
1610                 case KBD_TIMEOUT_MINUTES:
1611                         value *= 60;
1612                         unit = KBD_TIMEOUT_SECONDS;
1613                 }
1614
1615                 if (quirks && quirks->needs_kbd_timeouts) {
1616                         for (i = 0; quirks->kbd_timeouts[i] != -1; i++) {
1617                                 if (value <= quirks->kbd_timeouts[i]) {
1618                                         value = quirks->kbd_timeouts[i];
1619                                         break;
1620                                 }
1621                         }
1622                 }
1623
1624                 if (value <= kbd_info.seconds && kbd_info.seconds) {
1625                         unit = KBD_TIMEOUT_SECONDS;
1626                 } else if (value / 60 <= kbd_info.minutes && kbd_info.minutes) {
1627                         value /= 60;
1628                         unit = KBD_TIMEOUT_MINUTES;
1629                 } else if (value / (60 * 60) <= kbd_info.hours && kbd_info.hours) {
1630                         value /= (60 * 60);
1631                         unit = KBD_TIMEOUT_HOURS;
1632                 } else if (value / (60 * 60 * 24) <= kbd_info.days && kbd_info.days) {
1633                         value /= (60 * 60 * 24);
1634                         unit = KBD_TIMEOUT_DAYS;
1635                 } else {
1636                         return -EINVAL;
1637                 }
1638         }
1639
1640         mutex_lock(&kbd_led_mutex);
1641
1642         ret = kbd_get_state(&state);
1643         if (ret)
1644                 goto out;
1645
1646         new_state = state;
1647
1648         if (kbd_timeout_ac_supported && power_supply_is_system_supplied() > 0) {
1649                 new_state.timeout_value_ac = value;
1650                 new_state.timeout_unit_ac = unit;
1651         } else {
1652                 new_state.timeout_value = value;
1653                 new_state.timeout_unit = unit;
1654         }
1655
1656         ret = kbd_set_state_safe(&new_state, &state);
1657         if (ret)
1658                 goto out;
1659
1660         ret = count;
1661 out:
1662         mutex_unlock(&kbd_led_mutex);
1663         return ret;
1664 }
1665
1666 static ssize_t kbd_led_timeout_show(struct device *dev,
1667                                     struct device_attribute *attr, char *buf)
1668 {
1669         struct kbd_state state;
1670         int value;
1671         int ret;
1672         int len;
1673         u8 unit;
1674
1675         ret = kbd_get_state(&state);
1676         if (ret)
1677                 return ret;
1678
1679         if (kbd_timeout_ac_supported && power_supply_is_system_supplied() > 0) {
1680                 value = state.timeout_value_ac;
1681                 unit = state.timeout_unit_ac;
1682         } else {
1683                 value = state.timeout_value;
1684                 unit = state.timeout_unit;
1685         }
1686
1687         len = sprintf(buf, "%d", value);
1688
1689         switch (unit) {
1690         case KBD_TIMEOUT_SECONDS:
1691                 return len + sprintf(buf+len, "s\n");
1692         case KBD_TIMEOUT_MINUTES:
1693                 return len + sprintf(buf+len, "m\n");
1694         case KBD_TIMEOUT_HOURS:
1695                 return len + sprintf(buf+len, "h\n");
1696         case KBD_TIMEOUT_DAYS:
1697                 return len + sprintf(buf+len, "d\n");
1698         default:
1699                 return -EINVAL;
1700         }
1701
1702         return len;
1703 }
1704
1705 static DEVICE_ATTR(stop_timeout, S_IRUGO | S_IWUSR,
1706                    kbd_led_timeout_show, kbd_led_timeout_store);
1707
1708 static const char * const kbd_led_triggers[] = {
1709         "keyboard",
1710         "touchpad",
1711         /*"trackstick"*/ NULL, /* NOTE: trackstick is just alias for touchpad */
1712         "mouse",
1713 };
1714
1715 static ssize_t kbd_led_triggers_store(struct device *dev,
1716                                       struct device_attribute *attr,
1717                                       const char *buf, size_t count)
1718 {
1719         struct kbd_state new_state;
1720         struct kbd_state state;
1721         bool triggers_enabled = false;
1722         int trigger_bit = -1;
1723         char trigger[21];
1724         int i, ret;
1725
1726         ret = sscanf(buf, "%20s", trigger);
1727         if (ret != 1)
1728                 return -EINVAL;
1729
1730         if (trigger[0] != '+' && trigger[0] != '-')
1731                 return -EINVAL;
1732
1733         mutex_lock(&kbd_led_mutex);
1734
1735         ret = kbd_get_state(&state);
1736         if (ret)
1737                 goto out;
1738
1739         if (kbd_triggers_supported)
1740                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1741
1742         if (kbd_triggers_supported) {
1743                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1744                         if (!(kbd_info.triggers & BIT(i)))
1745                                 continue;
1746                         if (!kbd_led_triggers[i])
1747                                 continue;
1748                         if (strcmp(trigger+1, kbd_led_triggers[i]) != 0)
1749                                 continue;
1750                         if (trigger[0] == '+' &&
1751                             triggers_enabled && (state.triggers & BIT(i))) {
1752                                 ret = count;
1753                                 goto out;
1754                         }
1755                         if (trigger[0] == '-' &&
1756                             (!triggers_enabled || !(state.triggers & BIT(i)))) {
1757                                 ret = count;
1758                                 goto out;
1759                         }
1760                         trigger_bit = i;
1761                         break;
1762                 }
1763         }
1764
1765         if (trigger_bit == -1) {
1766                 ret = -EINVAL;
1767                 goto out;
1768         }
1769
1770         new_state = state;
1771         if (trigger[0] == '+')
1772                 new_state.triggers |= BIT(trigger_bit);
1773         else {
1774                 new_state.triggers &= ~BIT(trigger_bit);
1775                 /*
1776                  * NOTE: trackstick bit (2) must be disabled when
1777                  *       disabling touchpad bit (1), otherwise touchpad
1778                  *       bit (1) will not be disabled
1779                  */
1780                 if (trigger_bit == 1)
1781                         new_state.triggers &= ~BIT(2);
1782         }
1783         if ((kbd_info.triggers & new_state.triggers) !=
1784             new_state.triggers) {
1785                 ret = -EINVAL;
1786                 goto out;
1787         }
1788         if (new_state.triggers && !triggers_enabled) {
1789                 new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1790                 kbd_set_level(&new_state, kbd_previous_level);
1791         } else if (new_state.triggers == 0) {
1792                 kbd_set_level(&new_state, 0);
1793         }
1794         if (!(kbd_info.modes & BIT(new_state.mode_bit))) {
1795                 ret = -EINVAL;
1796                 goto out;
1797         }
1798         ret = kbd_set_state_safe(&new_state, &state);
1799         if (ret)
1800                 goto out;
1801         if (new_state.mode_bit != KBD_MODE_BIT_OFF)
1802                 kbd_previous_mode_bit = new_state.mode_bit;
1803         ret = count;
1804 out:
1805         mutex_unlock(&kbd_led_mutex);
1806         return ret;
1807 }
1808
1809 static ssize_t kbd_led_triggers_show(struct device *dev,
1810                                      struct device_attribute *attr, char *buf)
1811 {
1812         struct kbd_state state;
1813         bool triggers_enabled;
1814         int level, i, ret;
1815         int len = 0;
1816
1817         ret = kbd_get_state(&state);
1818         if (ret)
1819                 return ret;
1820
1821         len = 0;
1822
1823         if (kbd_triggers_supported) {
1824                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1825                 level = kbd_get_level(&state);
1826                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1827                         if (!(kbd_info.triggers & BIT(i)))
1828                                 continue;
1829                         if (!kbd_led_triggers[i])
1830                                 continue;
1831                         if ((triggers_enabled || level <= 0) &&
1832                             (state.triggers & BIT(i)))
1833                                 buf[len++] = '+';
1834                         else
1835                                 buf[len++] = '-';
1836                         len += sprintf(buf+len, "%s ", kbd_led_triggers[i]);
1837                 }
1838         }
1839
1840         if (len)
1841                 buf[len - 1] = '\n';
1842
1843         return len;
1844 }
1845
1846 static DEVICE_ATTR(start_triggers, S_IRUGO | S_IWUSR,
1847                    kbd_led_triggers_show, kbd_led_triggers_store);
1848
1849 static ssize_t kbd_led_als_enabled_store(struct device *dev,
1850                                          struct device_attribute *attr,
1851                                          const char *buf, size_t count)
1852 {
1853         struct kbd_state new_state;
1854         struct kbd_state state;
1855         bool triggers_enabled = false;
1856         int enable;
1857         int ret;
1858
1859         ret = kstrtoint(buf, 0, &enable);
1860         if (ret)
1861                 return ret;
1862
1863         mutex_lock(&kbd_led_mutex);
1864
1865         ret = kbd_get_state(&state);
1866         if (ret)
1867                 goto out;
1868
1869         if (enable == kbd_is_als_mode_bit(state.mode_bit)) {
1870                 ret = count;
1871                 goto out;
1872         }
1873
1874         new_state = state;
1875
1876         if (kbd_triggers_supported)
1877                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1878
1879         if (enable) {
1880                 if (triggers_enabled)
1881                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER_ALS;
1882                 else
1883                         new_state.mode_bit = KBD_MODE_BIT_ALS;
1884         } else {
1885                 if (triggers_enabled) {
1886                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1887                         kbd_set_level(&new_state, kbd_previous_level);
1888                 } else {
1889                         new_state.mode_bit = KBD_MODE_BIT_ON;
1890                 }
1891         }
1892         if (!(kbd_info.modes & BIT(new_state.mode_bit)))  {
1893                 ret = -EINVAL;
1894                 goto out;
1895         }
1896
1897         ret = kbd_set_state_safe(&new_state, &state);
1898         if (ret)
1899                 goto out;
1900         kbd_previous_mode_bit = new_state.mode_bit;
1901
1902         ret = count;
1903 out:
1904         mutex_unlock(&kbd_led_mutex);
1905         return ret;
1906 }
1907
1908 static ssize_t kbd_led_als_enabled_show(struct device *dev,
1909                                         struct device_attribute *attr,
1910                                         char *buf)
1911 {
1912         struct kbd_state state;
1913         bool enabled = false;
1914         int ret;
1915
1916         ret = kbd_get_state(&state);
1917         if (ret)
1918                 return ret;
1919         enabled = kbd_is_als_mode_bit(state.mode_bit);
1920
1921         return sprintf(buf, "%d\n", enabled ? 1 : 0);
1922 }
1923
1924 static DEVICE_ATTR(als_enabled, S_IRUGO | S_IWUSR,
1925                    kbd_led_als_enabled_show, kbd_led_als_enabled_store);
1926
1927 static ssize_t kbd_led_als_setting_store(struct device *dev,
1928                                          struct device_attribute *attr,
1929                                          const char *buf, size_t count)
1930 {
1931         struct kbd_state state;
1932         struct kbd_state new_state;
1933         u8 setting;
1934         int ret;
1935
1936         ret = kstrtou8(buf, 10, &setting);
1937         if (ret)
1938                 return ret;
1939
1940         mutex_lock(&kbd_led_mutex);
1941
1942         ret = kbd_get_state(&state);
1943         if (ret)
1944                 goto out;
1945
1946         new_state = state;
1947         new_state.als_setting = setting;
1948
1949         ret = kbd_set_state_safe(&new_state, &state);
1950         if (ret)
1951                 goto out;
1952
1953         ret = count;
1954 out:
1955         mutex_unlock(&kbd_led_mutex);
1956         return ret;
1957 }
1958
1959 static ssize_t kbd_led_als_setting_show(struct device *dev,
1960                                         struct device_attribute *attr,
1961                                         char *buf)
1962 {
1963         struct kbd_state state;
1964         int ret;
1965
1966         ret = kbd_get_state(&state);
1967         if (ret)
1968                 return ret;
1969
1970         return sprintf(buf, "%d\n", state.als_setting);
1971 }
1972
1973 static DEVICE_ATTR(als_setting, S_IRUGO | S_IWUSR,
1974                    kbd_led_als_setting_show, kbd_led_als_setting_store);
1975
1976 static struct attribute *kbd_led_attrs[] = {
1977         &dev_attr_stop_timeout.attr,
1978         &dev_attr_start_triggers.attr,
1979         NULL,
1980 };
1981
1982 static const struct attribute_group kbd_led_group = {
1983         .attrs = kbd_led_attrs,
1984 };
1985
1986 static struct attribute *kbd_led_als_attrs[] = {
1987         &dev_attr_als_enabled.attr,
1988         &dev_attr_als_setting.attr,
1989         NULL,
1990 };
1991
1992 static const struct attribute_group kbd_led_als_group = {
1993         .attrs = kbd_led_als_attrs,
1994 };
1995
1996 static const struct attribute_group *kbd_led_groups[] = {
1997         &kbd_led_group,
1998         &kbd_led_als_group,
1999         NULL,
2000 };
2001
2002 static enum led_brightness kbd_led_level_get(struct led_classdev *led_cdev)
2003 {
2004         int ret;
2005         u16 num;
2006         struct kbd_state state;
2007
2008         if (kbd_get_max_level()) {
2009                 ret = kbd_get_state(&state);
2010                 if (ret)
2011                         return 0;
2012                 ret = kbd_get_level(&state);
2013                 if (ret < 0)
2014                         return 0;
2015                 return ret;
2016         }
2017
2018         if (kbd_get_valid_token_counts()) {
2019                 ret = kbd_get_first_active_token_bit();
2020                 if (ret < 0)
2021                         return 0;
2022                 for (num = kbd_token_bits; num != 0 && ret > 0; --ret)
2023                         num &= num - 1; /* clear the first bit set */
2024                 if (num == 0)
2025                         return 0;
2026                 return ffs(num) - 1;
2027         }
2028
2029         pr_warn("Keyboard brightness level control not supported\n");
2030         return 0;
2031 }
2032
2033 static int kbd_led_level_set(struct led_classdev *led_cdev,
2034                              enum led_brightness value)
2035 {
2036         enum led_brightness new_value = value;
2037         struct kbd_state state;
2038         struct kbd_state new_state;
2039         u16 num;
2040         int ret;
2041
2042         mutex_lock(&kbd_led_mutex);
2043
2044         if (kbd_get_max_level()) {
2045                 ret = kbd_get_state(&state);
2046                 if (ret)
2047                         goto out;
2048                 new_state = state;
2049                 ret = kbd_set_level(&new_state, value);
2050                 if (ret)
2051                         goto out;
2052                 ret = kbd_set_state_safe(&new_state, &state);
2053         } else if (kbd_get_valid_token_counts()) {
2054                 for (num = kbd_token_bits; num != 0 && value > 0; --value)
2055                         num &= num - 1; /* clear the first bit set */
2056                 if (num == 0)
2057                         ret = 0;
2058                 else
2059                         ret = kbd_set_token_bit(ffs(num) - 1);
2060         } else {
2061                 pr_warn("Keyboard brightness level control not supported\n");
2062                 ret = -ENXIO;
2063         }
2064
2065 out:
2066         if (ret == 0)
2067                 kbd_led_level = new_value;
2068
2069         mutex_unlock(&kbd_led_mutex);
2070         return ret;
2071 }
2072
2073 static struct led_classdev kbd_led = {
2074         .name           = "dell::kbd_backlight",
2075         .flags          = LED_BRIGHT_HW_CHANGED,
2076         .brightness_set_blocking = kbd_led_level_set,
2077         .brightness_get = kbd_led_level_get,
2078         .groups         = kbd_led_groups,
2079 };
2080
2081 static int __init kbd_led_init(struct device *dev)
2082 {
2083         int ret;
2084
2085         kbd_init();
2086         if (!kbd_led_present)
2087                 return -ENODEV;
2088         if (!kbd_als_supported)
2089                 kbd_led_groups[1] = NULL;
2090         kbd_led.max_brightness = kbd_get_max_level();
2091         if (!kbd_led.max_brightness) {
2092                 kbd_led.max_brightness = kbd_get_valid_token_counts();
2093                 if (kbd_led.max_brightness)
2094                         kbd_led.max_brightness--;
2095         }
2096
2097         kbd_led_level = kbd_led_level_get(NULL);
2098
2099         ret = led_classdev_register(dev, &kbd_led);
2100         if (ret)
2101                 kbd_led_present = false;
2102
2103         return ret;
2104 }
2105
2106 static void brightness_set_exit(struct led_classdev *led_cdev,
2107                                 enum led_brightness value)
2108 {
2109         /* Don't change backlight level on exit */
2110 };
2111
2112 static void kbd_led_exit(void)
2113 {
2114         if (!kbd_led_present)
2115                 return;
2116         kbd_led.brightness_set = brightness_set_exit;
2117         led_classdev_unregister(&kbd_led);
2118 }
2119
2120 static int dell_laptop_notifier_call(struct notifier_block *nb,
2121                                      unsigned long action, void *data)
2122 {
2123         bool changed = false;
2124         enum led_brightness new_kbd_led_level;
2125
2126         switch (action) {
2127         case DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED:
2128                 if (!kbd_led_present)
2129                         break;
2130
2131                 mutex_lock(&kbd_led_mutex);
2132                 new_kbd_led_level = kbd_led_level_get(&kbd_led);
2133                 if (kbd_led_level != new_kbd_led_level) {
2134                         kbd_led_level = new_kbd_led_level;
2135                         changed = true;
2136                 }
2137                 mutex_unlock(&kbd_led_mutex);
2138
2139                 if (changed)
2140                         led_classdev_notify_brightness_hw_changed(&kbd_led,
2141                                                                 kbd_led_level);
2142                 break;
2143         }
2144
2145         return NOTIFY_OK;
2146 }
2147
2148 static struct notifier_block dell_laptop_notifier = {
2149         .notifier_call = dell_laptop_notifier_call,
2150 };
2151
2152 static int micmute_led_set(struct led_classdev *led_cdev,
2153                            enum led_brightness brightness)
2154 {
2155         struct calling_interface_buffer buffer;
2156         struct calling_interface_token *token;
2157         int state = brightness != LED_OFF;
2158
2159         if (state == 0)
2160                 token = dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE);
2161         else
2162                 token = dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE);
2163
2164         if (!token)
2165                 return -ENODEV;
2166
2167         dell_fill_request(&buffer, token->location, token->value, 0, 0);
2168         dell_send_request(&buffer, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
2169
2170         return 0;
2171 }
2172
2173 static struct led_classdev micmute_led_cdev = {
2174         .name = "platform::micmute",
2175         .max_brightness = 1,
2176         .brightness_set_blocking = micmute_led_set,
2177         .default_trigger = "audio-micmute",
2178 };
2179
2180 static int __init dell_init(void)
2181 {
2182         struct calling_interface_token *token;
2183         int max_intensity = 0;
2184         int ret;
2185
2186         if (!dmi_check_system(dell_device_table))
2187                 return -ENODEV;
2188
2189         quirks = NULL;
2190         /* find if this machine support other functions */
2191         dmi_check_system(dell_quirks);
2192
2193         ret = platform_driver_register(&platform_driver);
2194         if (ret)
2195                 goto fail_platform_driver;
2196         platform_device = platform_device_alloc("dell-laptop", -1);
2197         if (!platform_device) {
2198                 ret = -ENOMEM;
2199                 goto fail_platform_device1;
2200         }
2201         ret = platform_device_add(platform_device);
2202         if (ret)
2203                 goto fail_platform_device2;
2204
2205         ret = dell_setup_rfkill();
2206
2207         if (ret) {
2208                 pr_warn("Unable to setup rfkill\n");
2209                 goto fail_rfkill;
2210         }
2211
2212         if (quirks && quirks->touchpad_led)
2213                 touchpad_led_init(&platform_device->dev);
2214
2215         kbd_led_init(&platform_device->dev);
2216
2217         dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
2218         debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
2219                             &dell_debugfs_fops);
2220
2221         dell_laptop_register_notifier(&dell_laptop_notifier);
2222
2223         if (dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE) &&
2224             dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE) &&
2225             !dell_privacy_has_mic_mute()) {
2226                 micmute_led_cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
2227                 ret = led_classdev_register(&platform_device->dev, &micmute_led_cdev);
2228                 if (ret < 0)
2229                         goto fail_led;
2230                 micmute_led_registered = true;
2231         }
2232
2233         if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
2234                 return 0;
2235
2236         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
2237         if (token) {
2238                 struct calling_interface_buffer buffer;
2239
2240                 dell_fill_request(&buffer, token->location, 0, 0, 0);
2241                 ret = dell_send_request(&buffer,
2242                                         CLASS_TOKEN_READ, SELECT_TOKEN_AC);
2243                 if (ret == 0)
2244                         max_intensity = buffer.output[3];
2245         }
2246
2247         if (max_intensity) {
2248                 struct backlight_properties props;
2249                 memset(&props, 0, sizeof(struct backlight_properties));
2250                 props.type = BACKLIGHT_PLATFORM;
2251                 props.max_brightness = max_intensity;
2252                 dell_backlight_device = backlight_device_register("dell_backlight",
2253                                                                   &platform_device->dev,
2254                                                                   NULL,
2255                                                                   &dell_ops,
2256                                                                   &props);
2257
2258                 if (IS_ERR(dell_backlight_device)) {
2259                         ret = PTR_ERR(dell_backlight_device);
2260                         dell_backlight_device = NULL;
2261                         goto fail_backlight;
2262                 }
2263
2264                 dell_backlight_device->props.brightness =
2265                         dell_get_intensity(dell_backlight_device);
2266                 if (dell_backlight_device->props.brightness < 0) {
2267                         ret = dell_backlight_device->props.brightness;
2268                         goto fail_get_brightness;
2269                 }
2270                 backlight_update_status(dell_backlight_device);
2271         }
2272
2273         return 0;
2274
2275 fail_get_brightness:
2276         backlight_device_unregister(dell_backlight_device);
2277 fail_backlight:
2278         if (micmute_led_registered)
2279                 led_classdev_unregister(&micmute_led_cdev);
2280 fail_led:
2281         dell_cleanup_rfkill();
2282 fail_rfkill:
2283         platform_device_del(platform_device);
2284 fail_platform_device2:
2285         platform_device_put(platform_device);
2286 fail_platform_device1:
2287         platform_driver_unregister(&platform_driver);
2288 fail_platform_driver:
2289         return ret;
2290 }
2291
2292 static void __exit dell_exit(void)
2293 {
2294         dell_laptop_unregister_notifier(&dell_laptop_notifier);
2295         debugfs_remove_recursive(dell_laptop_dir);
2296         if (quirks && quirks->touchpad_led)
2297                 touchpad_led_exit();
2298         kbd_led_exit();
2299         backlight_device_unregister(dell_backlight_device);
2300         if (micmute_led_registered)
2301                 led_classdev_unregister(&micmute_led_cdev);
2302         dell_cleanup_rfkill();
2303         if (platform_device) {
2304                 platform_device_unregister(platform_device);
2305                 platform_driver_unregister(&platform_driver);
2306         }
2307 }
2308
2309 /* dell-rbtn.c driver export functions which will not work correctly (and could
2310  * cause kernel crash) if they are called before dell-rbtn.c init code. This is
2311  * not problem when dell-rbtn.c is compiled as external module. When both files
2312  * (dell-rbtn.c and dell-laptop.c) are compiled statically into kernel, then we
2313  * need to ensure that dell_init() will be called after initializing dell-rbtn.
2314  * This can be achieved by late_initcall() instead module_init().
2315  */
2316 late_initcall(dell_init);
2317 module_exit(dell_exit);
2318
2319 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
2320 MODULE_AUTHOR("Gabriele Mazzotta <gabriele.mzt@gmail.com>");
2321 MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");
2322 MODULE_DESCRIPTION("Dell laptop driver");
2323 MODULE_LICENSE("GPL");