drivers/platform/x86/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.rohar@gmail.com>
   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 struct quirk_entry {
  35         bool touchpad_led;
  36         bool kbd_led_levels_off_1;
  37         bool kbd_missing_ac_tag;
  38
  39         bool needs_kbd_timeouts;
  40         /*
  41          * Ordered list of timeouts expressed in seconds.
  42          * The list must end with -1
  43          */
  44         int kbd_timeouts[];
  45 };
  46
  47 static struct quirk_entry *quirks;
  48
  49 static struct quirk_entry quirk_dell_vostro_v130 = {
  50         .touchpad_led = true,
  51 };
  52
  53 static int __init dmi_matched(const struct dmi_system_id *dmi)
  54 {
  55         quirks = dmi->driver_data;
  56         return 1;
  57 }
  58
  59 /*
  60  * These values come from Windows utility provided by Dell. If any other value
  61  * is used then BIOS silently set timeout to 0 without any error message.
  62  */
  63 static struct quirk_entry quirk_dell_xps13_9333 = {
  64         .needs_kbd_timeouts = true,
  65         .kbd_timeouts = { 0, 5, 15, 60, 5 * 60, 15 * 60, -1 },
  66 };
  67
  68 static struct quirk_entry quirk_dell_xps13_9370 = {
  69         .kbd_missing_ac_tag = true,
  70 };
  71
  72 static struct quirk_entry quirk_dell_latitude_e6410 = {
  73         .kbd_led_levels_off_1 = true,
  74 };
  75
  76 static struct platform_driver platform_driver = {
  77         .driver = {
  78                 .name = "dell-laptop",
  79         }
  80 };
  81
  82 static struct platform_device *platform_device;
  83 static struct backlight_device *dell_backlight_device;
  84 static struct rfkill *wifi_rfkill;
  85 static struct rfkill *bluetooth_rfkill;
  86 static struct rfkill *wwan_rfkill;
  87 static bool force_rfkill;
  88
  89 module_param(force_rfkill, bool, 0444);
  90 MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
  91
  92 static const struct dmi_system_id dell_device_table[] __initconst = {
  93         {
  94                 .ident = "Dell laptop",
  95                 .matches = {
  96                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
  97                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
  98                 },
  99         },
 100         {
 101                 .matches = {
 102                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 103                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
 104                 },
 105         },
 106         {
 107                 .matches = {
 108                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 109                         DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /*Notebook*/
 110                 },
 111         },
 112         {
 113                 .matches = {
 114                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 115                         DMI_MATCH(DMI_CHASSIS_TYPE, "30"), /*Tablet*/
 116                 },
 117         },
 118         {
 119                 .matches = {
 120                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 121                         DMI_MATCH(DMI_CHASSIS_TYPE, "31"), /*Convertible*/
 122                 },
 123         },
 124         {
 125                 .matches = {
 126                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 127                         DMI_MATCH(DMI_CHASSIS_TYPE, "32"), /*Detachable*/
 128                 },
 129         },
 130         {
 131                 .ident = "Dell Computer Corporation",
 132                 .matches = {
 133                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 134                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 135                 },
 136         },
 137         { }
 138 };
 139 MODULE_DEVICE_TABLE(dmi, dell_device_table);
 140
 141 static const struct dmi_system_id dell_quirks[] __initconst = {
 142         {
 143                 .callback = dmi_matched,
 144                 .ident = "Dell Vostro V130",
 145                 .matches = {
 146                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 147                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
 148                 },
 149                 .driver_data = &quirk_dell_vostro_v130,
 150         },
 151         {
 152                 .callback = dmi_matched,
 153                 .ident = "Dell Vostro V131",
 154                 .matches = {
 155                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 156                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 157                 },
 158                 .driver_data = &quirk_dell_vostro_v130,
 159         },
 160         {
 161                 .callback = dmi_matched,
 162                 .ident = "Dell Vostro 3350",
 163                 .matches = {
 164                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 165                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
 166                 },
 167                 .driver_data = &quirk_dell_vostro_v130,
 168         },
 169         {
 170                 .callback = dmi_matched,
 171                 .ident = "Dell Vostro 3555",
 172                 .matches = {
 173                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 174                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
 175                 },
 176                 .driver_data = &quirk_dell_vostro_v130,
 177         },
 178         {
 179                 .callback = dmi_matched,
 180                 .ident = "Dell Inspiron N311z",
 181                 .matches = {
 182                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 183                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
 184                 },
 185                 .driver_data = &quirk_dell_vostro_v130,
 186         },
 187         {
 188                 .callback = dmi_matched,
 189                 .ident = "Dell Inspiron M5110",
 190                 .matches = {
 191                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 192                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
 193                 },
 194                 .driver_data = &quirk_dell_vostro_v130,
 195         },
 196         {
 197                 .callback = dmi_matched,
 198                 .ident = "Dell Vostro 3360",
 199                 .matches = {
 200                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 201                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
 202                 },
 203                 .driver_data = &quirk_dell_vostro_v130,
 204         },
 205         {
 206                 .callback = dmi_matched,
 207                 .ident = "Dell Vostro 3460",
 208                 .matches = {
 209                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 210                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"),
 211                 },
 212                 .driver_data = &quirk_dell_vostro_v130,
 213         },
 214         {
 215                 .callback = dmi_matched,
 216                 .ident = "Dell Vostro 3560",
 217                 .matches = {
 218                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 219                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"),
 220                 },
 221                 .driver_data = &quirk_dell_vostro_v130,
 222         },
 223         {
 224                 .callback = dmi_matched,
 225                 .ident = "Dell Vostro 3450",
 226                 .matches = {
 227                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 228                         DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"),
 229                 },
 230                 .driver_data = &quirk_dell_vostro_v130,
 231         },
 232         {
 233                 .callback = dmi_matched,
 234                 .ident = "Dell Inspiron 5420",
 235                 .matches = {
 236                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 237                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"),
 238                 },
 239                 .driver_data = &quirk_dell_vostro_v130,
 240         },
 241         {
 242                 .callback = dmi_matched,
 243                 .ident = "Dell Inspiron 5520",
 244                 .matches = {
 245                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 246                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"),
 247                 },
 248                 .driver_data = &quirk_dell_vostro_v130,
 249         },
 250         {
 251                 .callback = dmi_matched,
 252                 .ident = "Dell Inspiron 5720",
 253                 .matches = {
 254                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 255                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"),
 256                 },
 257                 .driver_data = &quirk_dell_vostro_v130,
 258         },
 259         {
 260                 .callback = dmi_matched,
 261                 .ident = "Dell Inspiron 7420",
 262                 .matches = {
 263                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 264                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"),
 265                 },
 266                 .driver_data = &quirk_dell_vostro_v130,
 267         },
 268         {
 269                 .callback = dmi_matched,
 270                 .ident = "Dell Inspiron 7520",
 271                 .matches = {
 272                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 273                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
 274                 },
 275                 .driver_data = &quirk_dell_vostro_v130,
 276         },
 277         {
 278                 .callback = dmi_matched,
 279                 .ident = "Dell Inspiron 7720",
 280                 .matches = {
 281                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 282                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
 283                 },
 284                 .driver_data = &quirk_dell_vostro_v130,
 285         },
 286         {
 287                 .callback = dmi_matched,
 288                 .ident = "Dell XPS13 9333",
 289                 .matches = {
 290                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 291                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
 292                 },
 293                 .driver_data = &quirk_dell_xps13_9333,
 294         },
 295         {
 296                 .callback = dmi_matched,
 297                 .ident = "Dell XPS 13 9370",
 298                 .matches = {
 299                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 300                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS 13 9370"),
 301                 },
 302                 .driver_data = &quirk_dell_xps13_9370,
 303         },
 304         {
 305                 .callback = dmi_matched,
 306                 .ident = "Dell Latitude E6410",
 307                 .matches = {
 308                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 309                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6410"),
 310                 },
 311                 .driver_data = &quirk_dell_latitude_e6410,
 312         },
 313         { }
 314 };
 315
 316 static void dell_fill_request(struct calling_interface_buffer *buffer,
 317                                u32 arg0, u32 arg1, u32 arg2, u32 arg3)
 318 {
 319         memset(buffer, 0, sizeof(struct calling_interface_buffer));
 320         buffer->input[0] = arg0;
 321         buffer->input[1] = arg1;
 322         buffer->input[2] = arg2;
 323         buffer->input[3] = arg3;
 324 }
 325
 326 static int dell_send_request(struct calling_interface_buffer *buffer,
 327                              u16 class, u16 select)
 328 {
 329         int ret;
 330
 331         buffer->cmd_class = class;
 332         buffer->cmd_select = select;
 333         ret = dell_smbios_call(buffer);
 334         if (ret != 0)
 335                 return ret;
 336         return dell_smbios_error(buffer->output[0]);
 337 }
 338
 339 /*
 340  * Derived from information in smbios-wireless-ctl:
 341  *
 342  * cbSelect 17, Value 11
 343  *
 344  * Return Wireless Info
 345  * cbArg1, byte0 = 0x00
 346  *
 347  *     cbRes1 Standard return codes (0, -1, -2)
 348  *     cbRes2 Info bit flags:
 349  *
 350  *     0 Hardware switch supported (1)
 351  *     1 WiFi locator supported (1)
 352  *     2 WLAN supported (1)
 353  *     3 Bluetooth (BT) supported (1)
 354  *     4 WWAN supported (1)
 355  *     5 Wireless KBD supported (1)
 356  *     6 Uw b supported (1)
 357  *     7 WiGig supported (1)
 358  *     8 WLAN installed (1)
 359  *     9 BT installed (1)
 360  *     10 WWAN installed (1)
 361  *     11 Uw b installed (1)
 362  *     12 WiGig installed (1)
 363  *     13-15 Reserved (0)
 364  *     16 Hardware (HW) switch is On (1)
 365  *     17 WLAN disabled (1)
 366  *     18 BT disabled (1)
 367  *     19 WWAN disabled (1)
 368  *     20 Uw b disabled (1)
 369  *     21 WiGig disabled (1)
 370  *     20-31 Reserved (0)
 371  *
 372  *     cbRes3 NVRAM size in bytes
 373  *     cbRes4, byte 0 NVRAM format version number
 374  *
 375  *
 376  * Set QuickSet Radio Disable Flag
 377  *     cbArg1, byte0 = 0x01
 378  *     cbArg1, byte1
 379  *     Radio ID     value:
 380  *     0        Radio Status
 381  *     1        WLAN ID
 382  *     2        BT ID
 383  *     3        WWAN ID
 384  *     4        UWB ID
 385  *     5        WIGIG ID
 386  *     cbArg1, byte2    Flag bits:
 387  *             0 QuickSet disables radio (1)
 388  *             1-7 Reserved (0)
 389  *
 390  *     cbRes1    Standard return codes (0, -1, -2)
 391  *     cbRes2    QuickSet (QS) radio disable bit map:
 392  *     0 QS disables WLAN
 393  *     1 QS disables BT
 394  *     2 QS disables WWAN
 395  *     3 QS disables UWB
 396  *     4 QS disables WIGIG
 397  *     5-31 Reserved (0)
 398  *
 399  * Wireless Switch Configuration
 400  *     cbArg1, byte0 = 0x02
 401  *
 402  *     cbArg1, byte1
 403  *     Subcommand:
 404  *     0 Get config
 405  *     1 Set config
 406  *     2 Set WiFi locator enable/disable
 407  *     cbArg1,byte2
 408  *     Switch settings (if byte 1==1):
 409  *     0 WLAN sw itch control (1)
 410  *     1 BT sw itch control (1)
 411  *     2 WWAN sw itch control (1)
 412  *     3 UWB sw itch control (1)
 413  *     4 WiGig sw itch control (1)
 414  *     5-7 Reserved (0)
 415  *    cbArg1, byte2 Enable bits (if byte 1==2):
 416  *     0 Enable WiFi locator (1)
 417  *
 418  *    cbRes1     Standard return codes (0, -1, -2)
 419  *    cbRes2 QuickSet radio disable bit map:
 420  *     0 WLAN controlled by sw itch (1)
 421  *     1 BT controlled by sw itch (1)
 422  *     2 WWAN controlled by sw itch (1)
 423  *     3 UWB controlled by sw itch (1)
 424  *     4 WiGig controlled by sw itch (1)
 425  *     5-6 Reserved (0)
 426  *     7 Wireless sw itch config locked (1)
 427  *     8 WiFi locator enabled (1)
 428  *     9-14 Reserved (0)
 429  *     15 WiFi locator setting locked (1)
 430  *     16-31 Reserved (0)
 431  *
 432  * Read Local Config Data (LCD)
 433  *     cbArg1, byte0 = 0x10
 434  *     cbArg1, byte1 NVRAM index low byte
 435  *     cbArg1, byte2 NVRAM index high byte
 436  *     cbRes1 Standard return codes (0, -1, -2)
 437  *     cbRes2 4 bytes read from LCD[index]
 438  *     cbRes3 4 bytes read from LCD[index+4]
 439  *     cbRes4 4 bytes read from LCD[index+8]
 440  *
 441  * Write Local Config Data (LCD)
 442  *     cbArg1, byte0 = 0x11
 443  *     cbArg1, byte1 NVRAM index low byte
 444  *     cbArg1, byte2 NVRAM index high byte
 445  *     cbArg2 4 bytes to w rite at LCD[index]
 446  *     cbArg3 4 bytes to w rite at LCD[index+4]
 447  *     cbArg4 4 bytes to w rite at LCD[index+8]
 448  *     cbRes1 Standard return codes (0, -1, -2)
 449  *
 450  * Populate Local Config Data from NVRAM
 451  *     cbArg1, byte0 = 0x12
 452  *     cbRes1 Standard return codes (0, -1, -2)
 453  *
 454  * Commit Local Config Data to NVRAM
 455  *     cbArg1, byte0 = 0x13
 456  *     cbRes1 Standard return codes (0, -1, -2)
 457  */
 458
 459 static int dell_rfkill_set(void *data, bool blocked)
 460 {
 461         int disable = blocked ? 1 : 0;
 462         unsigned long radio = (unsigned long)data;
 463         int hwswitch_bit = (unsigned long)data - 1;
 464         struct calling_interface_buffer buffer;
 465         int hwswitch;
 466         int status;
 467         int ret;
 468
 469         dell_fill_request(&buffer, 0, 0, 0, 0);
 470         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 471         if (ret)
 472                 return ret;
 473         status = buffer.output[1];
 474
 475         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 476         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 477         if (ret)
 478                 return ret;
 479         hwswitch = buffer.output[1];
 480
 481         /* If the hardware switch controls this radio, and the hardware
 482            switch is disabled, always disable the radio */
 483         if (ret == 0 && (hwswitch & BIT(hwswitch_bit)) &&
 484             (status & BIT(0)) && !(status & BIT(16)))
 485                 disable = 1;
 486
 487         dell_fill_request(&buffer, 1 | (radio<<8) | (disable << 16), 0, 0, 0);
 488         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 489         return ret;
 490 }
 491
 492 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
 493                                         int status)
 494 {
 495         if (status & BIT(0)) {
 496                 /* Has hw-switch, sync sw_state to BIOS */
 497                 struct calling_interface_buffer buffer;
 498                 int block = rfkill_blocked(rfkill);
 499                 dell_fill_request(&buffer,
 500                                    1 | (radio << 8) | (block << 16), 0, 0, 0);
 501                 dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 502         } else {
 503                 /* No hw-switch, sync BIOS state to sw_state */
 504                 rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
 505         }
 506 }
 507
 508 static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
 509                                         int status, int hwswitch)
 510 {
 511         if (hwswitch & (BIT(radio - 1)))
 512                 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
 513 }
 514
 515 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 516 {
 517         int radio = ((unsigned long)data & 0xF);
 518         struct calling_interface_buffer buffer;
 519         int hwswitch;
 520         int status;
 521         int ret;
 522
 523         dell_fill_request(&buffer, 0, 0, 0, 0);
 524         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 525         status = buffer.output[1];
 526
 527         if (ret != 0 || !(status & BIT(0))) {
 528                 return;
 529         }
 530
 531         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 532         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 533         hwswitch = buffer.output[1];
 534
 535         if (ret != 0)
 536                 return;
 537
 538         dell_rfkill_update_hw_state(rfkill, radio, status, hwswitch);
 539 }
 540
 541 static const struct rfkill_ops dell_rfkill_ops = {
 542         .set_block = dell_rfkill_set,
 543         .query = dell_rfkill_query,
 544 };
 545
 546 static struct dentry *dell_laptop_dir;
 547
 548 static int dell_debugfs_show(struct seq_file *s, void *data)
 549 {
 550         struct calling_interface_buffer buffer;
 551         int hwswitch_state;
 552         int hwswitch_ret;
 553         int status;
 554         int ret;
 555
 556         dell_fill_request(&buffer, 0, 0, 0, 0);
 557         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 558         if (ret)
 559                 return ret;
 560         status = buffer.output[1];
 561
 562         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 563         hwswitch_ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 564         if (hwswitch_ret)
 565                 return hwswitch_ret;
 566         hwswitch_state = buffer.output[1];
 567
 568         seq_printf(s, "return:\t%d\n", ret);
 569         seq_printf(s, "status:\t0x%X\n", status);
 570         seq_printf(s, "Bit 0 : Hardware switch supported:   %lu\n",
 571                    status & BIT(0));
 572         seq_printf(s, "Bit 1 : Wifi locator supported:      %lu\n",
 573                   (status & BIT(1)) >> 1);
 574         seq_printf(s, "Bit 2 : Wifi is supported:           %lu\n",
 575                   (status & BIT(2)) >> 2);
 576         seq_printf(s, "Bit 3 : Bluetooth is supported:      %lu\n",
 577                   (status & BIT(3)) >> 3);
 578         seq_printf(s, "Bit 4 : WWAN is supported:           %lu\n",
 579                   (status & BIT(4)) >> 4);
 580         seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
 581                   (status & BIT(5)) >> 5);
 582         seq_printf(s, "Bit 6 : UWB supported:               %lu\n",
 583                   (status & BIT(6)) >> 6);
 584         seq_printf(s, "Bit 7 : WiGig supported:             %lu\n",
 585                   (status & BIT(7)) >> 7);
 586         seq_printf(s, "Bit 8 : Wifi is installed:           %lu\n",
 587                   (status & BIT(8)) >> 8);
 588         seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
 589                   (status & BIT(9)) >> 9);
 590         seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
 591                   (status & BIT(10)) >> 10);
 592         seq_printf(s, "Bit 11: UWB installed:               %lu\n",
 593                   (status & BIT(11)) >> 11);
 594         seq_printf(s, "Bit 12: WiGig installed:             %lu\n",
 595                   (status & BIT(12)) >> 12);
 596
 597         seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
 598                   (status & BIT(16)) >> 16);
 599         seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
 600                   (status & BIT(17)) >> 17);
 601         seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
 602                   (status & BIT(18)) >> 18);
 603         seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
 604                   (status & BIT(19)) >> 19);
 605         seq_printf(s, "Bit 20: UWB is blocked:              %lu\n",
 606                   (status & BIT(20)) >> 20);
 607         seq_printf(s, "Bit 21: WiGig is blocked:            %lu\n",
 608                   (status & BIT(21)) >> 21);
 609
 610         seq_printf(s, "\nhwswitch_return:\t%d\n", hwswitch_ret);
 611         seq_printf(s, "hwswitch_state:\t0x%X\n", hwswitch_state);
 612         seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
 613                    hwswitch_state & BIT(0));
 614         seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
 615                    (hwswitch_state & BIT(1)) >> 1);
 616         seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
 617                    (hwswitch_state & BIT(2)) >> 2);
 618         seq_printf(s, "Bit 3 : UWB controlled by switch:       %lu\n",
 619                    (hwswitch_state & BIT(3)) >> 3);
 620         seq_printf(s, "Bit 4 : WiGig controlled by switch:     %lu\n",
 621                    (hwswitch_state & BIT(4)) >> 4);
 622         seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
 623                    (hwswitch_state & BIT(7)) >> 7);
 624         seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
 625                    (hwswitch_state & BIT(8)) >> 8);
 626         seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
 627                    (hwswitch_state & BIT(15)) >> 15);
 628
 629         return 0;
 630 }
 631 DEFINE_SHOW_ATTRIBUTE(dell_debugfs);
 632
 633 static void dell_update_rfkill(struct work_struct *ignored)
 634 {
 635         struct calling_interface_buffer buffer;
 636         int hwswitch = 0;
 637         int status;
 638         int ret;
 639
 640         dell_fill_request(&buffer, 0, 0, 0, 0);
 641         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 642         status = buffer.output[1];
 643
 644         if (ret != 0)
 645                 return;
 646
 647         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 648         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 649
 650         if (ret == 0 && (status & BIT(0)))
 651                 hwswitch = buffer.output[1];
 652
 653         if (wifi_rfkill) {
 654                 dell_rfkill_update_hw_state(wifi_rfkill, 1, status, hwswitch);
 655                 dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
 656         }
 657         if (bluetooth_rfkill) {
 658                 dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status,
 659                                             hwswitch);
 660                 dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
 661         }
 662         if (wwan_rfkill) {
 663                 dell_rfkill_update_hw_state(wwan_rfkill, 3, status, hwswitch);
 664                 dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
 665         }
 666 }
 667 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
 668
 669 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
 670                               struct serio *port)
 671 {
 672         static bool extended;
 673
 674         if (str & I8042_STR_AUXDATA)
 675                 return false;
 676
 677         if (unlikely(data == 0xe0)) {
 678                 extended = true;
 679                 return false;
 680         } else if (unlikely(extended)) {
 681                 switch (data) {
 682                 case 0x8:
 683                         schedule_delayed_work(&dell_rfkill_work,
 684                                               round_jiffies_relative(HZ / 4));
 685                         break;
 686                 }
 687                 extended = false;
 688         }
 689
 690         return false;
 691 }
 692
 693 static int (*dell_rbtn_notifier_register_func)(struct notifier_block *);
 694 static int (*dell_rbtn_notifier_unregister_func)(struct notifier_block *);
 695
 696 static int dell_laptop_rbtn_notifier_call(struct notifier_block *nb,
 697                                           unsigned long action, void *data)
 698 {
 699         schedule_delayed_work(&dell_rfkill_work, 0);
 700         return NOTIFY_OK;
 701 }
 702
 703 static struct notifier_block dell_laptop_rbtn_notifier = {
 704         .notifier_call = dell_laptop_rbtn_notifier_call,
 705 };
 706
 707 static int __init dell_setup_rfkill(void)
 708 {
 709         struct calling_interface_buffer buffer;
 710         int status, ret, whitelisted;
 711         const char *product;
 712
 713         /*
 714          * rfkill support causes trouble on various models, mostly Inspirons.
 715          * So we whitelist certain series, and don't support rfkill on others.
 716          */
 717         whitelisted = 0;
 718         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 719         if (product &&  (strncmp(product, "Latitude", 8) == 0 ||
 720                          strncmp(product, "Precision", 9) == 0))
 721                 whitelisted = 1;
 722         if (!force_rfkill && !whitelisted)
 723                 return 0;
 724
 725         dell_fill_request(&buffer, 0, 0, 0, 0);
 726         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 727         status = buffer.output[1];
 728
 729         /* dell wireless info smbios call is not supported */
 730         if (ret != 0)
 731                 return 0;
 732
 733         /* rfkill is only tested on laptops with a hwswitch */
 734         if (!(status & BIT(0)) && !force_rfkill)
 735                 return 0;
 736
 737         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 738                 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
 739                                            RFKILL_TYPE_WLAN,
 740                                            &dell_rfkill_ops, (void *) 1);
 741                 if (!wifi_rfkill) {
 742                         ret = -ENOMEM;
 743                         goto err_wifi;
 744                 }
 745                 ret = rfkill_register(wifi_rfkill);
 746                 if (ret)
 747                         goto err_wifi;
 748         }
 749
 750         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 751                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
 752                                                 &platform_device->dev,
 753                                                 RFKILL_TYPE_BLUETOOTH,
 754                                                 &dell_rfkill_ops, (void *) 2);
 755                 if (!bluetooth_rfkill) {
 756                         ret = -ENOMEM;
 757                         goto err_bluetooth;
 758                 }
 759                 ret = rfkill_register(bluetooth_rfkill);
 760                 if (ret)
 761                         goto err_bluetooth;
 762         }
 763
 764         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 765                 wwan_rfkill = rfkill_alloc("dell-wwan",
 766                                            &platform_device->dev,
 767                                            RFKILL_TYPE_WWAN,
 768                                            &dell_rfkill_ops, (void *) 3);
 769                 if (!wwan_rfkill) {
 770                         ret = -ENOMEM;
 771                         goto err_wwan;
 772                 }
 773                 ret = rfkill_register(wwan_rfkill);
 774                 if (ret)
 775                         goto err_wwan;
 776         }
 777
 778         /*
 779          * Dell Airplane Mode Switch driver (dell-rbtn) supports ACPI devices
 780          * which can receive events from HW slider switch.
 781          *
 782          * Dell SMBIOS on whitelisted models supports controlling radio devices
 783          * but does not support receiving HW button switch events. We can use
 784          * i8042 filter hook function to receive keyboard data and handle
 785          * keycode for HW button.
 786          *
 787          * So if it is possible we will use Dell Airplane Mode Switch ACPI
 788          * driver for receiving HW events and Dell SMBIOS for setting rfkill
 789          * states. If ACPI driver or device is not available we will fallback to
 790          * i8042 filter hook function.
 791          *
 792          * To prevent duplicate rfkill devices which control and do same thing,
 793          * dell-rbtn driver will automatically remove its own rfkill devices
 794          * once function dell_rbtn_notifier_register() is called.
 795          */
 796
 797         dell_rbtn_notifier_register_func =
 798                 symbol_request(dell_rbtn_notifier_register);
 799         if (dell_rbtn_notifier_register_func) {
 800                 dell_rbtn_notifier_unregister_func =
 801                         symbol_request(dell_rbtn_notifier_unregister);
 802                 if (!dell_rbtn_notifier_unregister_func) {
 803                         symbol_put(dell_rbtn_notifier_register);
 804                         dell_rbtn_notifier_register_func = NULL;
 805                 }
 806         }
 807
 808         if (dell_rbtn_notifier_register_func) {
 809                 ret = dell_rbtn_notifier_register_func(
 810                         &dell_laptop_rbtn_notifier);
 811                 symbol_put(dell_rbtn_notifier_register);
 812                 dell_rbtn_notifier_register_func = NULL;
 813                 if (ret != 0) {
 814                         symbol_put(dell_rbtn_notifier_unregister);
 815                         dell_rbtn_notifier_unregister_func = NULL;
 816                 }
 817         } else {
 818                 pr_info("Symbols from dell-rbtn acpi driver are not available\n");
 819                 ret = -ENODEV;
 820         }
 821
 822         if (ret == 0) {
 823                 pr_info("Using dell-rbtn acpi driver for receiving events\n");
 824         } else if (ret != -ENODEV) {
 825                 pr_warn("Unable to register dell rbtn notifier\n");
 826                 goto err_filter;
 827         } else {
 828                 ret = i8042_install_filter(dell_laptop_i8042_filter);
 829                 if (ret) {
 830                         pr_warn("Unable to install key filter\n");
 831                         goto err_filter;
 832                 }
 833                 pr_info("Using i8042 filter function for receiving events\n");
 834         }
 835
 836         return 0;
 837 err_filter:
 838         if (wwan_rfkill)
 839                 rfkill_unregister(wwan_rfkill);
 840 err_wwan:
 841         rfkill_destroy(wwan_rfkill);
 842         if (bluetooth_rfkill)
 843                 rfkill_unregister(bluetooth_rfkill);
 844 err_bluetooth:
 845         rfkill_destroy(bluetooth_rfkill);
 846         if (wifi_rfkill)
 847                 rfkill_unregister(wifi_rfkill);
 848 err_wifi:
 849         rfkill_destroy(wifi_rfkill);
 850
 851         return ret;
 852 }
 853
 854 static void dell_cleanup_rfkill(void)
 855 {
 856         if (dell_rbtn_notifier_unregister_func) {
 857                 dell_rbtn_notifier_unregister_func(&dell_laptop_rbtn_notifier);
 858                 symbol_put(dell_rbtn_notifier_unregister);
 859                 dell_rbtn_notifier_unregister_func = NULL;
 860         } else {
 861                 i8042_remove_filter(dell_laptop_i8042_filter);
 862         }
 863         cancel_delayed_work_sync(&dell_rfkill_work);
 864         if (wifi_rfkill) {
 865                 rfkill_unregister(wifi_rfkill);
 866                 rfkill_destroy(wifi_rfkill);
 867         }
 868         if (bluetooth_rfkill) {
 869                 rfkill_unregister(bluetooth_rfkill);
 870                 rfkill_destroy(bluetooth_rfkill);
 871         }
 872         if (wwan_rfkill) {
 873                 rfkill_unregister(wwan_rfkill);
 874                 rfkill_destroy(wwan_rfkill);
 875         }
 876 }
 877
 878 static int dell_send_intensity(struct backlight_device *bd)
 879 {
 880         struct calling_interface_buffer buffer;
 881         struct calling_interface_token *token;
 882         int ret;
 883
 884         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
 885         if (!token)
 886                 return -ENODEV;
 887
 888         dell_fill_request(&buffer,
 889                            token->location, bd->props.brightness, 0, 0);
 890         if (power_supply_is_system_supplied() > 0)
 891                 ret = dell_send_request(&buffer,
 892                                         CLASS_TOKEN_WRITE, SELECT_TOKEN_AC);
 893         else
 894                 ret = dell_send_request(&buffer,
 895                                         CLASS_TOKEN_WRITE, SELECT_TOKEN_BAT);
 896
 897         return ret;
 898 }
 899
 900 static int dell_get_intensity(struct backlight_device *bd)
 901 {
 902         struct calling_interface_buffer buffer;
 903         struct calling_interface_token *token;
 904         int ret;
 905
 906         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
 907         if (!token)
 908                 return -ENODEV;
 909
 910         dell_fill_request(&buffer, token->location, 0, 0, 0);
 911         if (power_supply_is_system_supplied() > 0)
 912                 ret = dell_send_request(&buffer,
 913                                         CLASS_TOKEN_READ, SELECT_TOKEN_AC);
 914         else
 915                 ret = dell_send_request(&buffer,
 916                                         CLASS_TOKEN_READ, SELECT_TOKEN_BAT);
 917
 918         if (ret == 0)
 919                 ret = buffer.output[1];
 920
 921         return ret;
 922 }
 923
 924 static const struct backlight_ops dell_ops = {
 925         .get_brightness = dell_get_intensity,
 926         .update_status  = dell_send_intensity,
 927 };
 928
 929 static void touchpad_led_on(void)
 930 {
 931         int command = 0x97;
 932         char data = 1;
 933         i8042_command(&data, command | 1 << 12);
 934 }
 935
 936 static void touchpad_led_off(void)
 937 {
 938         int command = 0x97;
 939         char data = 2;
 940         i8042_command(&data, command | 1 << 12);
 941 }
 942
 943 static void touchpad_led_set(struct led_classdev *led_cdev,
 944         enum led_brightness value)
 945 {
 946         if (value > 0)
 947                 touchpad_led_on();
 948         else
 949                 touchpad_led_off();
 950 }
 951
 952 static struct led_classdev touchpad_led = {
 953         .name = "dell-laptop::touchpad",
 954         .brightness_set = touchpad_led_set,
 955         .flags = LED_CORE_SUSPENDRESUME,
 956 };
 957
 958 static int __init touchpad_led_init(struct device *dev)
 959 {
 960         return led_classdev_register(dev, &touchpad_led);
 961 }
 962
 963 static void touchpad_led_exit(void)
 964 {
 965         led_classdev_unregister(&touchpad_led);
 966 }
 967
 968 /*
 969  * Derived from information in smbios-keyboard-ctl:
 970  *
 971  * cbClass 4
 972  * cbSelect 11
 973  * Keyboard illumination
 974  * cbArg1 determines the function to be performed
 975  *
 976  * cbArg1 0x0 = Get Feature Information
 977  *  cbRES1         Standard return codes (0, -1, -2)
 978  *  cbRES2, word0  Bitmap of user-selectable modes
 979  *     bit 0     Always off (All systems)
 980  *     bit 1     Always on (Travis ATG, Siberia)
 981  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
 982  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
 983  *     bit 4     Auto: Input-activity-based On; input-activity based Off
 984  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
 985  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
 986  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
 987  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
 988  *     bits 9-15 Reserved for future use
 989  *  cbRES2, byte2  Reserved for future use
 990  *  cbRES2, byte3  Keyboard illumination type
 991  *     0         Reserved
 992  *     1         Tasklight
 993  *     2         Backlight
 994  *     3-255     Reserved for future use
 995  *  cbRES3, byte0  Supported auto keyboard illumination trigger bitmap.
 996  *     bit 0     Any keystroke
 997  *     bit 1     Touchpad activity
 998  *     bit 2     Pointing stick
 999  *     bit 3     Any mouse
1000  *     bits 4-7  Reserved for future use
1001  *  cbRES3, byte1  Supported timeout unit bitmap
1002  *     bit 0     Seconds
1003  *     bit 1     Minutes
1004  *     bit 2     Hours
1005  *     bit 3     Days
1006  *     bits 4-7  Reserved for future use
1007  *  cbRES3, byte2  Number of keyboard light brightness levels
1008  *  cbRES4, byte0  Maximum acceptable seconds value (0 if seconds not supported).
1009  *  cbRES4, byte1  Maximum acceptable minutes value (0 if minutes not supported).
1010  *  cbRES4, byte2  Maximum acceptable hours value (0 if hours not supported).
1011  *  cbRES4, byte3  Maximum acceptable days value (0 if days not supported)
1012  *
1013  * cbArg1 0x1 = Get Current State
1014  *  cbRES1         Standard return codes (0, -1, -2)
1015  *  cbRES2, word0  Bitmap of current mode state
1016  *     bit 0     Always off (All systems)
1017  *     bit 1     Always on (Travis ATG, Siberia)
1018  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1019  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1020  *     bit 4     Auto: Input-activity-based On; input-activity based Off
1021  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1022  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1023  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1024  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1025  *     bits 9-15 Reserved for future use
1026  *     Note: Only One bit can be set
1027  *  cbRES2, byte2  Currently active auto keyboard illumination triggers.
1028  *     bit 0     Any keystroke
1029  *     bit 1     Touchpad activity
1030  *     bit 2     Pointing stick
1031  *     bit 3     Any mouse
1032  *     bits 4-7  Reserved for future use
1033  *  cbRES2, byte3  Current Timeout on battery
1034  *     bits 7:6  Timeout units indicator:
1035  *     00b       Seconds
1036  *     01b       Minutes
1037  *     10b       Hours
1038  *     11b       Days
1039  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1040  *     NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte
1041  *     are set upon return from the [Get feature information] call.
1042  *  cbRES3, byte0  Current setting of ALS value that turns the light on or off.
1043  *  cbRES3, byte1  Current ALS reading
1044  *  cbRES3, byte2  Current keyboard light level.
1045  *  cbRES3, byte3  Current timeout on AC Power
1046  *     bits 7:6  Timeout units indicator:
1047  *     00b       Seconds
1048  *     01b       Minutes
1049  *     10b       Hours
1050  *     11b       Days
1051  *     Bits 5:0  Timeout value (0-63) in sec/min/hr/day
1052  *     NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte2
1053  *     are set upon return from the upon return from the [Get Feature information] call.
1054  *
1055  * cbArg1 0x2 = Set New State
1056  *  cbRES1         Standard return codes (0, -1, -2)
1057  *  cbArg2, word0  Bitmap of current mode state
1058  *     bit 0     Always off (All systems)
1059  *     bit 1     Always on (Travis ATG, Siberia)
1060  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1061  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1062  *     bit 4     Auto: Input-activity-based On; input-activity based Off
1063  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1064  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1065  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1066  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1067  *     bits 9-15 Reserved for future use
1068  *     Note: Only One bit can be set
1069  *  cbArg2, byte2  Desired auto keyboard illumination triggers. Must remain inactive to allow
1070  *                 keyboard to turn off automatically.
1071  *     bit 0     Any keystroke
1072  *     bit 1     Touchpad activity
1073  *     bit 2     Pointing stick
1074  *     bit 3     Any mouse
1075  *     bits 4-7  Reserved for future use
1076  *  cbArg2, byte3  Desired Timeout on battery
1077  *     bits 7:6  Timeout units indicator:
1078  *     00b       Seconds
1079  *     01b       Minutes
1080  *     10b       Hours
1081  *     11b       Days
1082  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1083  *  cbArg3, byte0  Desired setting of ALS value that turns the light on or off.
1084  *  cbArg3, byte2  Desired keyboard light level.
1085  *  cbArg3, byte3  Desired Timeout on AC power
1086  *     bits 7:6  Timeout units indicator:
1087  *     00b       Seconds
1088  *     01b       Minutes
1089  *     10b       Hours
1090  *     11b       Days
1091  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1092  */
1093
1094
1095 enum kbd_timeout_unit {
1096         KBD_TIMEOUT_SECONDS = 0,
1097         KBD_TIMEOUT_MINUTES,
1098         KBD_TIMEOUT_HOURS,
1099         KBD_TIMEOUT_DAYS,
1100 };
1101
1102 enum kbd_mode_bit {
1103         KBD_MODE_BIT_OFF = 0,
1104         KBD_MODE_BIT_ON,
1105         KBD_MODE_BIT_ALS,
1106         KBD_MODE_BIT_TRIGGER_ALS,
1107         KBD_MODE_BIT_TRIGGER,
1108         KBD_MODE_BIT_TRIGGER_25,
1109         KBD_MODE_BIT_TRIGGER_50,
1110         KBD_MODE_BIT_TRIGGER_75,
1111         KBD_MODE_BIT_TRIGGER_100,
1112 };
1113
1114 #define kbd_is_als_mode_bit(bit) \
1115         ((bit) == KBD_MODE_BIT_ALS || (bit) == KBD_MODE_BIT_TRIGGER_ALS)
1116 #define kbd_is_trigger_mode_bit(bit) \
1117         ((bit) >= KBD_MODE_BIT_TRIGGER_ALS && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1118 #define kbd_is_level_mode_bit(bit) \
1119         ((bit) >= KBD_MODE_BIT_TRIGGER_25 && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1120
1121 struct kbd_info {
1122         u16 modes;
1123         u8 type;
1124         u8 triggers;
1125         u8 levels;
1126         u8 seconds;
1127         u8 minutes;
1128         u8 hours;
1129         u8 days;
1130 };
1131
1132 struct kbd_state {
1133         u8 mode_bit;
1134         u8 triggers;
1135         u8 timeout_value;
1136         u8 timeout_unit;
1137         u8 timeout_value_ac;
1138         u8 timeout_unit_ac;
1139         u8 als_setting;
1140         u8 als_value;
1141         u8 level;
1142 };
1143
1144 static const int kbd_tokens[] = {
1145         KBD_LED_OFF_TOKEN,
1146         KBD_LED_AUTO_25_TOKEN,
1147         KBD_LED_AUTO_50_TOKEN,
1148         KBD_LED_AUTO_75_TOKEN,
1149         KBD_LED_AUTO_100_TOKEN,
1150         KBD_LED_ON_TOKEN,
1151 };
1152
1153 static u16 kbd_token_bits;
1154
1155 static struct kbd_info kbd_info;
1156 static bool kbd_als_supported;
1157 static bool kbd_triggers_supported;
1158 static bool kbd_timeout_ac_supported;
1159
1160 static u8 kbd_mode_levels[16];
1161 static int kbd_mode_levels_count;
1162
1163 static u8 kbd_previous_level;
1164 static u8 kbd_previous_mode_bit;
1165
1166 static bool kbd_led_present;
1167 static DEFINE_MUTEX(kbd_led_mutex);
1168 static enum led_brightness kbd_led_level;
1169
1170 /*
1171  * NOTE: there are three ways to set the keyboard backlight level.
1172  * First, via kbd_state.mode_bit (assigning KBD_MODE_BIT_TRIGGER_* value).
1173  * Second, via kbd_state.level (assigning numerical value <= kbd_info.levels).
1174  * Third, via SMBIOS tokens (KBD_LED_* in kbd_tokens)
1175  *
1176  * There are laptops which support only one of these methods. If we want to
1177  * support as many machines as possible we need to implement all three methods.
1178  * The first two methods use the kbd_state structure. The third uses SMBIOS
1179  * tokens. If kbd_info.levels == 0, the machine does not support setting the
1180  * keyboard backlight level via kbd_state.level.
1181  */
1182
1183 static int kbd_get_info(struct kbd_info *info)
1184 {
1185         struct calling_interface_buffer buffer;
1186         u8 units;
1187         int ret;
1188
1189         dell_fill_request(&buffer, 0, 0, 0, 0);
1190         ret = dell_send_request(&buffer,
1191                                 CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1192         if (ret)
1193                 return ret;
1194
1195         info->modes = buffer.output[1] & 0xFFFF;
1196         info->type = (buffer.output[1] >> 24) & 0xFF;
1197         info->triggers = buffer.output[2] & 0xFF;
1198         units = (buffer.output[2] >> 8) & 0xFF;
1199         info->levels = (buffer.output[2] >> 16) & 0xFF;
1200
1201         if (quirks && quirks->kbd_led_levels_off_1 && info->levels)
1202                 info->levels--;
1203
1204         if (units & BIT(0))
1205                 info->seconds = (buffer.output[3] >> 0) & 0xFF;
1206         if (units & BIT(1))
1207                 info->minutes = (buffer.output[3] >> 8) & 0xFF;
1208         if (units & BIT(2))
1209                 info->hours = (buffer.output[3] >> 16) & 0xFF;
1210         if (units & BIT(3))
1211                 info->days = (buffer.output[3] >> 24) & 0xFF;
1212
1213         return ret;
1214 }
1215
1216 static unsigned int kbd_get_max_level(void)
1217 {
1218         if (kbd_info.levels != 0)
1219                 return kbd_info.levels;
1220         if (kbd_mode_levels_count > 0)
1221                 return kbd_mode_levels_count - 1;
1222         return 0;
1223 }
1224
1225 static int kbd_get_level(struct kbd_state *state)
1226 {
1227         int i;
1228
1229         if (kbd_info.levels != 0)
1230                 return state->level;
1231
1232         if (kbd_mode_levels_count > 0) {
1233                 for (i = 0; i < kbd_mode_levels_count; ++i)
1234                         if (kbd_mode_levels[i] == state->mode_bit)
1235                                 return i;
1236                 return 0;
1237         }
1238
1239         return -EINVAL;
1240 }
1241
1242 static int kbd_set_level(struct kbd_state *state, u8 level)
1243 {
1244         if (kbd_info.levels != 0) {
1245                 if (level != 0)
1246                         kbd_previous_level = level;
1247                 if (state->level == level)
1248                         return 0;
1249                 state->level = level;
1250                 if (level != 0 && state->mode_bit == KBD_MODE_BIT_OFF)
1251                         state->mode_bit = kbd_previous_mode_bit;
1252                 else if (level == 0 && state->mode_bit != KBD_MODE_BIT_OFF) {
1253                         kbd_previous_mode_bit = state->mode_bit;
1254                         state->mode_bit = KBD_MODE_BIT_OFF;
1255                 }
1256                 return 0;
1257         }
1258
1259         if (kbd_mode_levels_count > 0 && level < kbd_mode_levels_count) {
1260                 if (level != 0)
1261                         kbd_previous_level = level;
1262                 state->mode_bit = kbd_mode_levels[level];
1263                 return 0;
1264         }
1265
1266         return -EINVAL;
1267 }
1268
1269 static int kbd_get_state(struct kbd_state *state)
1270 {
1271         struct calling_interface_buffer buffer;
1272         int ret;
1273
1274         dell_fill_request(&buffer, 0x1, 0, 0, 0);
1275         ret = dell_send_request(&buffer,
1276                                 CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1277         if (ret)
1278                 return ret;
1279
1280         state->mode_bit = ffs(buffer.output[1] & 0xFFFF);
1281         if (state->mode_bit != 0)
1282                 state->mode_bit--;
1283
1284         state->triggers = (buffer.output[1] >> 16) & 0xFF;
1285         state->timeout_value = (buffer.output[1] >> 24) & 0x3F;
1286         state->timeout_unit = (buffer.output[1] >> 30) & 0x3;
1287         state->als_setting = buffer.output[2] & 0xFF;
1288         state->als_value = (buffer.output[2] >> 8) & 0xFF;
1289         state->level = (buffer.output[2] >> 16) & 0xFF;
1290         state->timeout_value_ac = (buffer.output[2] >> 24) & 0x3F;
1291         state->timeout_unit_ac = (buffer.output[2] >> 30) & 0x3;
1292
1293         return ret;
1294 }
1295
1296 static int kbd_set_state(struct kbd_state *state)
1297 {
1298         struct calling_interface_buffer buffer;
1299         int ret;
1300         u32 input1;
1301         u32 input2;
1302
1303         input1 = BIT(state->mode_bit) & 0xFFFF;
1304         input1 |= (state->triggers & 0xFF) << 16;
1305         input1 |= (state->timeout_value & 0x3F) << 24;
1306         input1 |= (state->timeout_unit & 0x3) << 30;
1307         input2 = state->als_setting & 0xFF;
1308         input2 |= (state->level & 0xFF) << 16;
1309         input2 |= (state->timeout_value_ac & 0x3F) << 24;
1310         input2 |= (state->timeout_unit_ac & 0x3) << 30;
1311         dell_fill_request(&buffer, 0x2, input1, input2, 0);
1312         ret = dell_send_request(&buffer,
1313                                 CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1314
1315         return ret;
1316 }
1317
1318 static int kbd_set_state_safe(struct kbd_state *state, struct kbd_state *old)
1319 {
1320         int ret;
1321
1322         ret = kbd_set_state(state);
1323         if (ret == 0)
1324                 return 0;
1325
1326         /*
1327          * When setting the new state fails,try to restore the previous one.
1328          * This is needed on some machines where BIOS sets a default state when
1329          * setting a new state fails. This default state could be all off.
1330          */
1331
1332         if (kbd_set_state(old))
1333                 pr_err("Setting old previous keyboard state failed\n");
1334
1335         return ret;
1336 }
1337
1338 static int kbd_set_token_bit(u8 bit)
1339 {
1340         struct calling_interface_buffer buffer;
1341         struct calling_interface_token *token;
1342         int ret;
1343
1344         if (bit >= ARRAY_SIZE(kbd_tokens))
1345                 return -EINVAL;
1346
1347         token = dell_smbios_find_token(kbd_tokens[bit]);
1348         if (!token)
1349                 return -EINVAL;
1350
1351         dell_fill_request(&buffer, token->location, token->value, 0, 0);
1352         ret = dell_send_request(&buffer, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
1353
1354         return ret;
1355 }
1356
1357 static int kbd_get_token_bit(u8 bit)
1358 {
1359         struct calling_interface_buffer buffer;
1360         struct calling_interface_token *token;
1361         int ret;
1362         int val;
1363
1364         if (bit >= ARRAY_SIZE(kbd_tokens))
1365                 return -EINVAL;
1366
1367         token = dell_smbios_find_token(kbd_tokens[bit]);
1368         if (!token)
1369                 return -EINVAL;
1370
1371         dell_fill_request(&buffer, token->location, 0, 0, 0);
1372         ret = dell_send_request(&buffer, CLASS_TOKEN_READ, SELECT_TOKEN_STD);
1373         val = buffer.output[1];
1374
1375         if (ret)
1376                 return ret;
1377
1378         return (val == token->value);
1379 }
1380
1381 static int kbd_get_first_active_token_bit(void)
1382 {
1383         int i;
1384         int ret;
1385
1386         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i) {
1387                 ret = kbd_get_token_bit(i);
1388                 if (ret == 1)
1389                         return i;
1390         }
1391
1392         return ret;
1393 }
1394
1395 static int kbd_get_valid_token_counts(void)
1396 {
1397         return hweight16(kbd_token_bits);
1398 }
1399
1400 static inline int kbd_init_info(void)
1401 {
1402         struct kbd_state state;
1403         int ret;
1404         int i;
1405
1406         ret = kbd_get_info(&kbd_info);
1407         if (ret)
1408                 return ret;
1409
1410         /* NOTE: Old models without KBD_LED_AC_TOKEN token supports only one
1411          *       timeout value which is shared for both battery and AC power
1412          *       settings. So do not try to set AC values on old models.
1413          */
1414         if ((quirks && quirks->kbd_missing_ac_tag) ||
1415             dell_smbios_find_token(KBD_LED_AC_TOKEN))
1416                 kbd_timeout_ac_supported = true;
1417
1418         kbd_get_state(&state);
1419
1420         /* NOTE: timeout value is stored in 6 bits so max value is 63 */
1421         if (kbd_info.seconds > 63)
1422                 kbd_info.seconds = 63;
1423         if (kbd_info.minutes > 63)
1424                 kbd_info.minutes = 63;
1425         if (kbd_info.hours > 63)
1426                 kbd_info.hours = 63;
1427         if (kbd_info.days > 63)
1428                 kbd_info.days = 63;
1429
1430         /* NOTE: On tested machines ON mode did not work and caused
1431          *       problems (turned backlight off) so do not use it
1432          */
1433         kbd_info.modes &= ~BIT(KBD_MODE_BIT_ON);
1434
1435         kbd_previous_level = kbd_get_level(&state);
1436         kbd_previous_mode_bit = state.mode_bit;
1437
1438         if (kbd_previous_level == 0 && kbd_get_max_level() != 0)
1439                 kbd_previous_level = 1;
1440
1441         if (kbd_previous_mode_bit == KBD_MODE_BIT_OFF) {
1442                 kbd_previous_mode_bit =
1443                         ffs(kbd_info.modes & ~BIT(KBD_MODE_BIT_OFF));
1444                 if (kbd_previous_mode_bit != 0)
1445                         kbd_previous_mode_bit--;
1446         }
1447
1448         if (kbd_info.modes & (BIT(KBD_MODE_BIT_ALS) |
1449                               BIT(KBD_MODE_BIT_TRIGGER_ALS)))
1450                 kbd_als_supported = true;
1451
1452         if (kbd_info.modes & (
1453             BIT(KBD_MODE_BIT_TRIGGER_ALS) | BIT(KBD_MODE_BIT_TRIGGER) |
1454             BIT(KBD_MODE_BIT_TRIGGER_25) | BIT(KBD_MODE_BIT_TRIGGER_50) |
1455             BIT(KBD_MODE_BIT_TRIGGER_75) | BIT(KBD_MODE_BIT_TRIGGER_100)
1456            ))
1457                 kbd_triggers_supported = true;
1458
1459         /* kbd_mode_levels[0] is reserved, see below */
1460         for (i = 0; i < 16; ++i)
1461                 if (kbd_is_level_mode_bit(i) && (BIT(i) & kbd_info.modes))
1462                         kbd_mode_levels[1 + kbd_mode_levels_count++] = i;
1463
1464         /*
1465          * Find the first supported mode and assign to kbd_mode_levels[0].
1466          * This should be 0 (off), but we cannot depend on the BIOS to
1467          * support 0.
1468          */
1469         if (kbd_mode_levels_count > 0) {
1470                 for (i = 0; i < 16; ++i) {
1471                         if (BIT(i) & kbd_info.modes) {
1472                                 kbd_mode_levels[0] = i;
1473                                 break;
1474                         }
1475                 }
1476                 kbd_mode_levels_count++;
1477         }
1478
1479         return 0;
1480
1481 }
1482
1483 static inline void kbd_init_tokens(void)
1484 {
1485         int i;
1486
1487         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i)
1488                 if (dell_smbios_find_token(kbd_tokens[i]))
1489                         kbd_token_bits |= BIT(i);
1490 }
1491
1492 static void kbd_init(void)
1493 {
1494         int ret;
1495
1496         ret = kbd_init_info();
1497         kbd_init_tokens();
1498
1499         /*
1500          * Only supports keyboard backlight when it has at least two modes.
1501          */
1502         if ((ret == 0 && (kbd_info.levels != 0 || kbd_mode_levels_count >= 2))
1503             || kbd_get_valid_token_counts() >= 2)
1504                 kbd_led_present = true;
1505 }
1506
1507 static ssize_t kbd_led_timeout_store(struct device *dev,
1508                                      struct device_attribute *attr,
1509                                      const char *buf, size_t count)
1510 {
1511         struct kbd_state new_state;
1512         struct kbd_state state;
1513         bool convert;
1514         int value;
1515         int ret;
1516         char ch;
1517         u8 unit;
1518         int i;
1519
1520         ret = sscanf(buf, "%d %c", &value, &ch);
1521         if (ret < 1)
1522                 return -EINVAL;
1523         else if (ret == 1)
1524                 ch = 's';
1525
1526         if (value < 0)
1527                 return -EINVAL;
1528
1529         convert = false;
1530
1531         switch (ch) {
1532         case 's':
1533                 if (value > kbd_info.seconds)
1534                         convert = true;
1535                 unit = KBD_TIMEOUT_SECONDS;
1536                 break;
1537         case 'm':
1538                 if (value > kbd_info.minutes)
1539                         convert = true;
1540                 unit = KBD_TIMEOUT_MINUTES;
1541                 break;
1542         case 'h':
1543                 if (value > kbd_info.hours)
1544                         convert = true;
1545                 unit = KBD_TIMEOUT_HOURS;
1546                 break;
1547         case 'd':
1548                 if (value > kbd_info.days)
1549                         convert = true;
1550                 unit = KBD_TIMEOUT_DAYS;
1551                 break;
1552         default:
1553                 return -EINVAL;
1554         }
1555
1556         if (quirks && quirks->needs_kbd_timeouts)
1557                 convert = true;
1558
1559         if (convert) {
1560                 /* Convert value from current units to seconds */
1561                 switch (unit) {
1562                 case KBD_TIMEOUT_DAYS:
1563                         value *= 24;
1564                         /* fall through */
1565                 case KBD_TIMEOUT_HOURS:
1566                         value *= 60;
1567                         /* fall through */
1568                 case KBD_TIMEOUT_MINUTES:
1569                         value *= 60;
1570                         unit = KBD_TIMEOUT_SECONDS;
1571                 }
1572
1573                 if (quirks && quirks->needs_kbd_timeouts) {
1574                         for (i = 0; quirks->kbd_timeouts[i] != -1; i++) {
1575                                 if (value <= quirks->kbd_timeouts[i]) {
1576                                         value = quirks->kbd_timeouts[i];
1577                                         break;
1578                                 }
1579                         }
1580                 }
1581
1582                 if (value <= kbd_info.seconds && kbd_info.seconds) {
1583                         unit = KBD_TIMEOUT_SECONDS;
1584                 } else if (value / 60 <= kbd_info.minutes && kbd_info.minutes) {
1585                         value /= 60;
1586                         unit = KBD_TIMEOUT_MINUTES;
1587                 } else if (value / (60 * 60) <= kbd_info.hours && kbd_info.hours) {
1588                         value /= (60 * 60);
1589                         unit = KBD_TIMEOUT_HOURS;
1590                 } else if (value / (60 * 60 * 24) <= kbd_info.days && kbd_info.days) {
1591                         value /= (60 * 60 * 24);
1592                         unit = KBD_TIMEOUT_DAYS;
1593                 } else {
1594                         return -EINVAL;
1595                 }
1596         }
1597
1598         mutex_lock(&kbd_led_mutex);
1599
1600         ret = kbd_get_state(&state);
1601         if (ret)
1602                 goto out;
1603
1604         new_state = state;
1605
1606         if (kbd_timeout_ac_supported && power_supply_is_system_supplied() > 0) {
1607                 new_state.timeout_value_ac = value;
1608                 new_state.timeout_unit_ac = unit;
1609         } else {
1610                 new_state.timeout_value = value;
1611                 new_state.timeout_unit = unit;
1612         }
1613
1614         ret = kbd_set_state_safe(&new_state, &state);
1615         if (ret)
1616                 goto out;
1617
1618         ret = count;
1619 out:
1620         mutex_unlock(&kbd_led_mutex);
1621         return ret;
1622 }
1623
1624 static ssize_t kbd_led_timeout_show(struct device *dev,
1625                                     struct device_attribute *attr, char *buf)
1626 {
1627         struct kbd_state state;
1628         int value;
1629         int ret;
1630         int len;
1631         u8 unit;
1632
1633         ret = kbd_get_state(&state);
1634         if (ret)
1635                 return ret;
1636
1637         if (kbd_timeout_ac_supported && power_supply_is_system_supplied() > 0) {
1638                 value = state.timeout_value_ac;
1639                 unit = state.timeout_unit_ac;
1640         } else {
1641                 value = state.timeout_value;
1642                 unit = state.timeout_unit;
1643         }
1644
1645         len = sprintf(buf, "%d", value);
1646
1647         switch (unit) {
1648         case KBD_TIMEOUT_SECONDS:
1649                 return len + sprintf(buf+len, "s\n");
1650         case KBD_TIMEOUT_MINUTES:
1651                 return len + sprintf(buf+len, "m\n");
1652         case KBD_TIMEOUT_HOURS:
1653                 return len + sprintf(buf+len, "h\n");
1654         case KBD_TIMEOUT_DAYS:
1655                 return len + sprintf(buf+len, "d\n");
1656         default:
1657                 return -EINVAL;
1658         }
1659
1660         return len;
1661 }
1662
1663 static DEVICE_ATTR(stop_timeout, S_IRUGO | S_IWUSR,
1664                    kbd_led_timeout_show, kbd_led_timeout_store);
1665
1666 static const char * const kbd_led_triggers[] = {
1667         "keyboard",
1668         "touchpad",
1669         /*"trackstick"*/ NULL, /* NOTE: trackstick is just alias for touchpad */
1670         "mouse",
1671 };
1672
1673 static ssize_t kbd_led_triggers_store(struct device *dev,
1674                                       struct device_attribute *attr,
1675                                       const char *buf, size_t count)
1676 {
1677         struct kbd_state new_state;
1678         struct kbd_state state;
1679         bool triggers_enabled = false;
1680         int trigger_bit = -1;
1681         char trigger[21];
1682         int i, ret;
1683
1684         ret = sscanf(buf, "%20s", trigger);
1685         if (ret != 1)
1686                 return -EINVAL;
1687
1688         if (trigger[0] != '+' && trigger[0] != '-')
1689                 return -EINVAL;
1690
1691         mutex_lock(&kbd_led_mutex);
1692
1693         ret = kbd_get_state(&state);
1694         if (ret)
1695                 goto out;
1696
1697         if (kbd_triggers_supported)
1698                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1699
1700         if (kbd_triggers_supported) {
1701                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1702                         if (!(kbd_info.triggers & BIT(i)))
1703                                 continue;
1704                         if (!kbd_led_triggers[i])
1705                                 continue;
1706                         if (strcmp(trigger+1, kbd_led_triggers[i]) != 0)
1707                                 continue;
1708                         if (trigger[0] == '+' &&
1709                             triggers_enabled && (state.triggers & BIT(i))) {
1710                                 ret = count;
1711                                 goto out;
1712                         }
1713                         if (trigger[0] == '-' &&
1714                             (!triggers_enabled || !(state.triggers & BIT(i)))) {
1715                                 ret = count;
1716                                 goto out;
1717                         }
1718                         trigger_bit = i;
1719                         break;
1720                 }
1721         }
1722
1723         if (trigger_bit == -1) {
1724                 ret = -EINVAL;
1725                 goto out;
1726         }
1727
1728         new_state = state;
1729         if (trigger[0] == '+')
1730                 new_state.triggers |= BIT(trigger_bit);
1731         else {
1732                 new_state.triggers &= ~BIT(trigger_bit);
1733                 /*
1734                  * NOTE: trackstick bit (2) must be disabled when
1735                  *       disabling touchpad bit (1), otherwise touchpad
1736                  *       bit (1) will not be disabled
1737                  */
1738                 if (trigger_bit == 1)
1739                         new_state.triggers &= ~BIT(2);
1740         }
1741         if ((kbd_info.triggers & new_state.triggers) !=
1742             new_state.triggers) {
1743                 ret = -EINVAL;
1744                 goto out;
1745         }
1746         if (new_state.triggers && !triggers_enabled) {
1747                 new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1748                 kbd_set_level(&new_state, kbd_previous_level);
1749         } else if (new_state.triggers == 0) {
1750                 kbd_set_level(&new_state, 0);
1751         }
1752         if (!(kbd_info.modes & BIT(new_state.mode_bit))) {
1753                 ret = -EINVAL;
1754                 goto out;
1755         }
1756         ret = kbd_set_state_safe(&new_state, &state);
1757         if (ret)
1758                 goto out;
1759         if (new_state.mode_bit != KBD_MODE_BIT_OFF)
1760                 kbd_previous_mode_bit = new_state.mode_bit;
1761         ret = count;
1762 out:
1763         mutex_unlock(&kbd_led_mutex);
1764         return ret;
1765 }
1766
1767 static ssize_t kbd_led_triggers_show(struct device *dev,
1768                                      struct device_attribute *attr, char *buf)
1769 {
1770         struct kbd_state state;
1771         bool triggers_enabled;
1772         int level, i, ret;
1773         int len = 0;
1774
1775         ret = kbd_get_state(&state);
1776         if (ret)
1777                 return ret;
1778
1779         len = 0;
1780
1781         if (kbd_triggers_supported) {
1782                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1783                 level = kbd_get_level(&state);
1784                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1785                         if (!(kbd_info.triggers & BIT(i)))
1786                                 continue;
1787                         if (!kbd_led_triggers[i])
1788                                 continue;
1789                         if ((triggers_enabled || level <= 0) &&
1790                             (state.triggers & BIT(i)))
1791                                 buf[len++] = '+';
1792                         else
1793                                 buf[len++] = '-';
1794                         len += sprintf(buf+len, "%s ", kbd_led_triggers[i]);
1795                 }
1796         }
1797
1798         if (len)
1799                 buf[len - 1] = '\n';
1800
1801         return len;
1802 }
1803
1804 static DEVICE_ATTR(start_triggers, S_IRUGO | S_IWUSR,
1805                    kbd_led_triggers_show, kbd_led_triggers_store);
1806
1807 static ssize_t kbd_led_als_enabled_store(struct device *dev,
1808                                          struct device_attribute *attr,
1809                                          const char *buf, size_t count)
1810 {
1811         struct kbd_state new_state;
1812         struct kbd_state state;
1813         bool triggers_enabled = false;
1814         int enable;
1815         int ret;
1816
1817         ret = kstrtoint(buf, 0, &enable);
1818         if (ret)
1819                 return ret;
1820
1821         mutex_lock(&kbd_led_mutex);
1822
1823         ret = kbd_get_state(&state);
1824         if (ret)
1825                 goto out;
1826
1827         if (enable == kbd_is_als_mode_bit(state.mode_bit)) {
1828                 ret = count;
1829                 goto out;
1830         }
1831
1832         new_state = state;
1833
1834         if (kbd_triggers_supported)
1835                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1836
1837         if (enable) {
1838                 if (triggers_enabled)
1839                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER_ALS;
1840                 else
1841                         new_state.mode_bit = KBD_MODE_BIT_ALS;
1842         } else {
1843                 if (triggers_enabled) {
1844                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1845                         kbd_set_level(&new_state, kbd_previous_level);
1846                 } else {
1847                         new_state.mode_bit = KBD_MODE_BIT_ON;
1848                 }
1849         }
1850         if (!(kbd_info.modes & BIT(new_state.mode_bit)))  {
1851                 ret = -EINVAL;
1852                 goto out;
1853         }
1854
1855         ret = kbd_set_state_safe(&new_state, &state);
1856         if (ret)
1857                 goto out;
1858         kbd_previous_mode_bit = new_state.mode_bit;
1859
1860         ret = count;
1861 out:
1862         mutex_unlock(&kbd_led_mutex);
1863         return ret;
1864 }
1865
1866 static ssize_t kbd_led_als_enabled_show(struct device *dev,
1867                                         struct device_attribute *attr,
1868                                         char *buf)
1869 {
1870         struct kbd_state state;
1871         bool enabled = false;
1872         int ret;
1873
1874         ret = kbd_get_state(&state);
1875         if (ret)
1876                 return ret;
1877         enabled = kbd_is_als_mode_bit(state.mode_bit);
1878
1879         return sprintf(buf, "%d\n", enabled ? 1 : 0);
1880 }
1881
1882 static DEVICE_ATTR(als_enabled, S_IRUGO | S_IWUSR,
1883                    kbd_led_als_enabled_show, kbd_led_als_enabled_store);
1884
1885 static ssize_t kbd_led_als_setting_store(struct device *dev,
1886                                          struct device_attribute *attr,
1887                                          const char *buf, size_t count)
1888 {
1889         struct kbd_state state;
1890         struct kbd_state new_state;
1891         u8 setting;
1892         int ret;
1893
1894         ret = kstrtou8(buf, 10, &setting);
1895         if (ret)
1896                 return ret;
1897
1898         mutex_lock(&kbd_led_mutex);
1899
1900         ret = kbd_get_state(&state);
1901         if (ret)
1902                 goto out;
1903
1904         new_state = state;
1905         new_state.als_setting = setting;
1906
1907         ret = kbd_set_state_safe(&new_state, &state);
1908         if (ret)
1909                 goto out;
1910
1911         ret = count;
1912 out:
1913         mutex_unlock(&kbd_led_mutex);
1914         return ret;
1915 }
1916
1917 static ssize_t kbd_led_als_setting_show(struct device *dev,
1918                                         struct device_attribute *attr,
1919                                         char *buf)
1920 {
1921         struct kbd_state state;
1922         int ret;
1923
1924         ret = kbd_get_state(&state);
1925         if (ret)
1926                 return ret;
1927
1928         return sprintf(buf, "%d\n", state.als_setting);
1929 }
1930
1931 static DEVICE_ATTR(als_setting, S_IRUGO | S_IWUSR,
1932                    kbd_led_als_setting_show, kbd_led_als_setting_store);
1933
1934 static struct attribute *kbd_led_attrs[] = {
1935         &dev_attr_stop_timeout.attr,
1936         &dev_attr_start_triggers.attr,
1937         NULL,
1938 };
1939
1940 static const struct attribute_group kbd_led_group = {
1941         .attrs = kbd_led_attrs,
1942 };
1943
1944 static struct attribute *kbd_led_als_attrs[] = {
1945         &dev_attr_als_enabled.attr,
1946         &dev_attr_als_setting.attr,
1947         NULL,
1948 };
1949
1950 static const struct attribute_group kbd_led_als_group = {
1951         .attrs = kbd_led_als_attrs,
1952 };
1953
1954 static const struct attribute_group *kbd_led_groups[] = {
1955         &kbd_led_group,
1956         &kbd_led_als_group,
1957         NULL,
1958 };
1959
1960 static enum led_brightness kbd_led_level_get(struct led_classdev *led_cdev)
1961 {
1962         int ret;
1963         u16 num;
1964         struct kbd_state state;
1965
1966         if (kbd_get_max_level()) {
1967                 ret = kbd_get_state(&state);
1968                 if (ret)
1969                         return 0;
1970                 ret = kbd_get_level(&state);
1971                 if (ret < 0)
1972                         return 0;
1973                 return ret;
1974         }
1975
1976         if (kbd_get_valid_token_counts()) {
1977                 ret = kbd_get_first_active_token_bit();
1978                 if (ret < 0)
1979                         return 0;
1980                 for (num = kbd_token_bits; num != 0 && ret > 0; --ret)
1981                         num &= num - 1; /* clear the first bit set */
1982                 if (num == 0)
1983                         return 0;
1984                 return ffs(num) - 1;
1985         }
1986
1987         pr_warn("Keyboard brightness level control not supported\n");
1988         return 0;
1989 }
1990
1991 static int kbd_led_level_set(struct led_classdev *led_cdev,
1992                              enum led_brightness value)
1993 {
1994         enum led_brightness new_value = value;
1995         struct kbd_state state;
1996         struct kbd_state new_state;
1997         u16 num;
1998         int ret;
1999
2000         mutex_lock(&kbd_led_mutex);
2001
2002         if (kbd_get_max_level()) {
2003                 ret = kbd_get_state(&state);
2004                 if (ret)
2005                         goto out;
2006                 new_state = state;
2007                 ret = kbd_set_level(&new_state, value);
2008                 if (ret)
2009                         goto out;
2010                 ret = kbd_set_state_safe(&new_state, &state);
2011         } else if (kbd_get_valid_token_counts()) {
2012                 for (num = kbd_token_bits; num != 0 && value > 0; --value)
2013                         num &= num - 1; /* clear the first bit set */
2014                 if (num == 0)
2015                         ret = 0;
2016                 else
2017                         ret = kbd_set_token_bit(ffs(num) - 1);
2018         } else {
2019                 pr_warn("Keyboard brightness level control not supported\n");
2020                 ret = -ENXIO;
2021         }
2022
2023 out:
2024         if (ret == 0)
2025                 kbd_led_level = new_value;
2026
2027         mutex_unlock(&kbd_led_mutex);
2028         return ret;
2029 }
2030
2031 static struct led_classdev kbd_led = {
2032         .name           = "dell::kbd_backlight",
2033         .flags          = LED_BRIGHT_HW_CHANGED,
2034         .brightness_set_blocking = kbd_led_level_set,
2035         .brightness_get = kbd_led_level_get,
2036         .groups         = kbd_led_groups,
2037 };
2038
2039 static int __init kbd_led_init(struct device *dev)
2040 {
2041         int ret;
2042
2043         kbd_init();
2044         if (!kbd_led_present)
2045                 return -ENODEV;
2046         if (!kbd_als_supported)
2047                 kbd_led_groups[1] = NULL;
2048         kbd_led.max_brightness = kbd_get_max_level();
2049         if (!kbd_led.max_brightness) {
2050                 kbd_led.max_brightness = kbd_get_valid_token_counts();
2051                 if (kbd_led.max_brightness)
2052                         kbd_led.max_brightness--;
2053         }
2054
2055         kbd_led_level = kbd_led_level_get(NULL);
2056
2057         ret = led_classdev_register(dev, &kbd_led);
2058         if (ret)
2059                 kbd_led_present = false;
2060
2061         return ret;
2062 }
2063
2064 static void brightness_set_exit(struct led_classdev *led_cdev,
2065                                 enum led_brightness value)
2066 {
2067         /* Don't change backlight level on exit */
2068 };
2069
2070 static void kbd_led_exit(void)
2071 {
2072         if (!kbd_led_present)
2073                 return;
2074         kbd_led.brightness_set = brightness_set_exit;
2075         led_classdev_unregister(&kbd_led);
2076 }
2077
2078 static int dell_laptop_notifier_call(struct notifier_block *nb,
2079                                      unsigned long action, void *data)
2080 {
2081         bool changed = false;
2082         enum led_brightness new_kbd_led_level;
2083
2084         switch (action) {
2085         case DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED:
2086                 if (!kbd_led_present)
2087                         break;
2088
2089                 mutex_lock(&kbd_led_mutex);
2090                 new_kbd_led_level = kbd_led_level_get(&kbd_led);
2091                 if (kbd_led_level != new_kbd_led_level) {
2092                         kbd_led_level = new_kbd_led_level;
2093                         changed = true;
2094                 }
2095                 mutex_unlock(&kbd_led_mutex);
2096
2097                 if (changed)
2098                         led_classdev_notify_brightness_hw_changed(&kbd_led,
2099                                                                 kbd_led_level);
2100                 break;
2101         }
2102
2103         return NOTIFY_OK;
2104 }
2105
2106 static struct notifier_block dell_laptop_notifier = {
2107         .notifier_call = dell_laptop_notifier_call,
2108 };
2109
2110 static int micmute_led_set(struct led_classdev *led_cdev,
2111                            enum led_brightness brightness)
2112 {
2113         struct calling_interface_buffer buffer;
2114         struct calling_interface_token *token;
2115         int state = brightness != LED_OFF;
2116
2117         if (state == 0)
2118                 token = dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE);
2119         else
2120                 token = dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE);
2121
2122         if (!token)
2123                 return -ENODEV;
2124
2125         dell_fill_request(&buffer, token->location, token->value, 0, 0);
2126         dell_send_request(&buffer, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
2127
2128         return 0;
2129 }
2130
2131 static struct led_classdev micmute_led_cdev = {
2132         .name = "platform::micmute",
2133         .max_brightness = 1,
2134         .brightness_set_blocking = micmute_led_set,
2135         .default_trigger = "audio-micmute",
2136 };
2137
2138 static int __init dell_init(void)
2139 {
2140         struct calling_interface_token *token;
2141         int max_intensity = 0;
2142         int ret;
2143
2144         if (!dmi_check_system(dell_device_table))
2145                 return -ENODEV;
2146
2147         quirks = NULL;
2148         /* find if this machine support other functions */
2149         dmi_check_system(dell_quirks);
2150
2151         ret = platform_driver_register(&platform_driver);
2152         if (ret)
2153                 goto fail_platform_driver;
2154         platform_device = platform_device_alloc("dell-laptop", -1);
2155         if (!platform_device) {
2156                 ret = -ENOMEM;
2157                 goto fail_platform_device1;
2158         }
2159         ret = platform_device_add(platform_device);
2160         if (ret)
2161                 goto fail_platform_device2;
2162
2163         ret = dell_setup_rfkill();
2164
2165         if (ret) {
2166                 pr_warn("Unable to setup rfkill\n");
2167                 goto fail_rfkill;
2168         }
2169
2170         if (quirks && quirks->touchpad_led)
2171                 touchpad_led_init(&platform_device->dev);
2172
2173         kbd_led_init(&platform_device->dev);
2174
2175         dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
2176         if (dell_laptop_dir != NULL)
2177                 debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
2178                                     &dell_debugfs_fops);
2179
2180         dell_laptop_register_notifier(&dell_laptop_notifier);
2181
2182         micmute_led_cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
2183         ret = led_classdev_register(&platform_device->dev, &micmute_led_cdev);
2184         if (ret < 0)
2185                 goto fail_led;
2186
2187         if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
2188                 return 0;
2189
2190         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
2191         if (token) {
2192                 struct calling_interface_buffer buffer;
2193
2194                 dell_fill_request(&buffer, token->location, 0, 0, 0);
2195                 ret = dell_send_request(&buffer,
2196                                         CLASS_TOKEN_READ, SELECT_TOKEN_AC);
2197                 if (ret == 0)
2198                         max_intensity = buffer.output[3];
2199         }
2200
2201         if (max_intensity) {
2202                 struct backlight_properties props;
2203                 memset(&props, 0, sizeof(struct backlight_properties));
2204                 props.type = BACKLIGHT_PLATFORM;
2205                 props.max_brightness = max_intensity;
2206                 dell_backlight_device = backlight_device_register("dell_backlight",
2207                                                                   &platform_device->dev,
2208                                                                   NULL,
2209                                                                   &dell_ops,
2210                                                                   &props);
2211
2212                 if (IS_ERR(dell_backlight_device)) {
2213                         ret = PTR_ERR(dell_backlight_device);
2214                         dell_backlight_device = NULL;
2215                         goto fail_backlight;
2216                 }
2217
2218                 dell_backlight_device->props.brightness =
2219                         dell_get_intensity(dell_backlight_device);
2220                 if (dell_backlight_device->props.brightness < 0) {
2221                         ret = dell_backlight_device->props.brightness;
2222                         goto fail_get_brightness;
2223                 }
2224                 backlight_update_status(dell_backlight_device);
2225         }
2226
2227         return 0;
2228
2229 fail_get_brightness:
2230         backlight_device_unregister(dell_backlight_device);
2231 fail_backlight:
2232         led_classdev_unregister(&micmute_led_cdev);
2233 fail_led:
2234         dell_cleanup_rfkill();
2235 fail_rfkill:
2236         platform_device_del(platform_device);
2237 fail_platform_device2:
2238         platform_device_put(platform_device);
2239 fail_platform_device1:
2240         platform_driver_unregister(&platform_driver);
2241 fail_platform_driver:
2242         return ret;
2243 }
2244
2245 static void __exit dell_exit(void)
2246 {
2247         dell_laptop_unregister_notifier(&dell_laptop_notifier);
2248         debugfs_remove_recursive(dell_laptop_dir);
2249         if (quirks && quirks->touchpad_led)
2250                 touchpad_led_exit();
2251         kbd_led_exit();
2252         backlight_device_unregister(dell_backlight_device);
2253         led_classdev_unregister(&micmute_led_cdev);
2254         dell_cleanup_rfkill();
2255         if (platform_device) {
2256                 platform_device_unregister(platform_device);
2257                 platform_driver_unregister(&platform_driver);
2258         }
2259 }
2260
2261 /* dell-rbtn.c driver export functions which will not work correctly (and could
2262  * cause kernel crash) if they are called before dell-rbtn.c init code. This is
2263  * not problem when dell-rbtn.c is compiled as external module. When both files
2264  * (dell-rbtn.c and dell-laptop.c) are compiled statically into kernel, then we
2265  * need to ensure that dell_init() will be called after initializing dell-rbtn.
2266  * This can be achieved by late_initcall() instead module_init().
2267  */
2268 late_initcall(dell_init);
2269 module_exit(dell_exit);
2270
2271 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
2272 MODULE_AUTHOR("Gabriele Mazzotta <gabriele.mzt@gmail.com>");
2273 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
2274 MODULE_DESCRIPTION("Dell laptop driver");
2275 MODULE_LICENSE("GPL");