drivers/platform/x86/dell-laptop.c

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