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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Driver for Dell laptop extras
   4  *
   5  *  Copyright (c) Red Hat <mjg@redhat.com>
   6  *  Copyright (c) 2014 Gabriele Mazzotta <gabriele.mzt@gmail.com>
   7  *  Copyright (c) 2014 Pali Rohár <pali@kernel.org>
   8  *
   9  *  Based on documentation in the libsmbios package:
  10  *  Copyright (C) 2005-2014 Dell Inc.
  11  */
  12
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/backlight.h>
  20 #include <linux/err.h>
  21 #include <linux/dmi.h>
  22 #include <linux/io.h>
  23 #include <linux/rfkill.h>
  24 #include <linux/power_supply.h>
  25 #include <linux/acpi.h>
  26 #include <linux/mm.h>
  27 #include <linux/i8042.h>
  28 #include <linux/debugfs.h>
  29 #include <linux/seq_file.h>
  30 #include <acpi/video.h>
  31 #include "dell-rbtn.h"
  32 #include "dell-smbios.h"
  33
  34 #include "dell-wmi-privacy.h"
  35
  36 struct quirk_entry {
  37         bool touchpad_led;
  38         bool kbd_led_not_present;
  39         bool kbd_led_levels_off_1;
  40         bool kbd_missing_ac_tag;
  41
  42         bool needs_kbd_timeouts;
  43         /*
  44          * Ordered list of timeouts expressed in seconds.
  45          * The list must end with -1
  46          */
  47         int kbd_timeouts[];
  48 };
  49
  50 static struct quirk_entry *quirks;
  51
  52 static struct quirk_entry quirk_dell_vostro_v130 = {
  53         .touchpad_led = true,
  54 };
  55
  56 static int __init dmi_matched(const struct dmi_system_id *dmi)
  57 {
  58         quirks = dmi->driver_data;
  59         return 1;
  60 }
  61
  62 /*
  63  * These values come from Windows utility provided by Dell. If any other value
  64  * is used then BIOS silently set timeout to 0 without any error message.
  65  */
  66 static struct quirk_entry quirk_dell_xps13_9333 = {
  67         .needs_kbd_timeouts = true,
  68         .kbd_timeouts = { 0, 5, 15, 60, 5 * 60, 15 * 60, -1 },
  69 };
  70
  71 static struct quirk_entry quirk_dell_xps13_9370 = {
  72         .kbd_missing_ac_tag = true,
  73 };
  74
  75 static struct quirk_entry quirk_dell_latitude_e6410 = {
  76         .kbd_led_levels_off_1 = true,
  77 };
  78
  79 static struct quirk_entry quirk_dell_inspiron_1012 = {
  80         .kbd_led_not_present = true,
  81 };
  82
  83 static struct platform_driver platform_driver = {
  84         .driver = {
  85                 .name = "dell-laptop",
  86         }
  87 };
  88
  89 static struct platform_device *platform_device;
  90 static struct backlight_device *dell_backlight_device;
  91 static struct rfkill *wifi_rfkill;
  92 static struct rfkill *bluetooth_rfkill;
  93 static struct rfkill *wwan_rfkill;
  94 static bool force_rfkill;
  95 static bool micmute_led_registered;
  96
  97 module_param(force_rfkill, bool, 0444);
  98 MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
  99
 100 static const struct dmi_system_id dell_device_table[] __initconst = {
 101         {
 102                 .ident = "Dell laptop",
 103                 .matches = {
 104                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 105                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 106                 },
 107         },
 108         {
 109                 .matches = {
 110                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 111                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
 112                 },
 113         },
 114         {
 115                 .matches = {
 116                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 117                         DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /*Notebook*/
 118                 },
 119         },
 120         {
 121                 .matches = {
 122                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 123                         DMI_MATCH(DMI_CHASSIS_TYPE, "30"), /*Tablet*/
 124                 },
 125         },
 126         {
 127                 .matches = {
 128                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 129                         DMI_MATCH(DMI_CHASSIS_TYPE, "31"), /*Convertible*/
 130                 },
 131         },
 132         {
 133                 .matches = {
 134                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 135                         DMI_MATCH(DMI_CHASSIS_TYPE, "32"), /*Detachable*/
 136                 },
 137         },
 138         {
 139                 .ident = "Dell Computer Corporation",
 140                 .matches = {
 141                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 142                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 143                 },
 144         },
 145         { }
 146 };
 147 MODULE_DEVICE_TABLE(dmi, dell_device_table);
 148
 149 static const struct dmi_system_id dell_quirks[] __initconst = {
 150         {
 151                 .callback = dmi_matched,
 152                 .ident = "Dell Vostro V130",
 153                 .matches = {
 154                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 155                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
 156                 },
 157                 .driver_data = &quirk_dell_vostro_v130,
 158         },
 159         {
 160                 .callback = dmi_matched,
 161                 .ident = "Dell Vostro V131",
 162                 .matches = {
 163                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 164                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 165                 },
 166                 .driver_data = &quirk_dell_vostro_v130,
 167         },
 168         {
 169                 .callback = dmi_matched,
 170                 .ident = "Dell Vostro 3350",
 171                 .matches = {
 172                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 173                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
 174                 },
 175                 .driver_data = &quirk_dell_vostro_v130,
 176         },
 177         {
 178                 .callback = dmi_matched,
 179                 .ident = "Dell Vostro 3555",
 180                 .matches = {
 181                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 182                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
 183                 },
 184                 .driver_data = &quirk_dell_vostro_v130,
 185         },
 186         {
 187                 .callback = dmi_matched,
 188                 .ident = "Dell Inspiron N311z",
 189                 .matches = {
 190                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 191                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
 192                 },
 193                 .driver_data = &quirk_dell_vostro_v130,
 194         },
 195         {
 196                 .callback = dmi_matched,
 197                 .ident = "Dell Inspiron M5110",
 198                 .matches = {
 199                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 200                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
 201                 },
 202                 .driver_data = &quirk_dell_vostro_v130,
 203         },
 204         {
 205                 .callback = dmi_matched,
 206                 .ident = "Dell Vostro 3360",
 207                 .matches = {
 208                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 209                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
 210                 },
 211                 .driver_data = &quirk_dell_vostro_v130,
 212         },
 213         {
 214                 .callback = dmi_matched,
 215                 .ident = "Dell Vostro 3460",
 216                 .matches = {
 217                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 218                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"),
 219                 },
 220                 .driver_data = &quirk_dell_vostro_v130,
 221         },
 222         {
 223                 .callback = dmi_matched,
 224                 .ident = "Dell Vostro 3560",
 225                 .matches = {
 226                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 227                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"),
 228                 },
 229                 .driver_data = &quirk_dell_vostro_v130,
 230         },
 231         {
 232                 .callback = dmi_matched,
 233                 .ident = "Dell Vostro 3450",
 234                 .matches = {
 235                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 236                         DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"),
 237                 },
 238                 .driver_data = &quirk_dell_vostro_v130,
 239         },
 240         {
 241                 .callback = dmi_matched,
 242                 .ident = "Dell Inspiron 5420",
 243                 .matches = {
 244                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 245                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"),
 246                 },
 247                 .driver_data = &quirk_dell_vostro_v130,
 248         },
 249         {
 250                 .callback = dmi_matched,
 251                 .ident = "Dell Inspiron 5520",
 252                 .matches = {
 253                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 254                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"),
 255                 },
 256                 .driver_data = &quirk_dell_vostro_v130,
 257         },
 258         {
 259                 .callback = dmi_matched,
 260                 .ident = "Dell Inspiron 5720",
 261                 .matches = {
 262                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 263                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"),
 264                 },
 265                 .driver_data = &quirk_dell_vostro_v130,
 266         },
 267         {
 268                 .callback = dmi_matched,
 269                 .ident = "Dell Inspiron 7420",
 270                 .matches = {
 271                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 272                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"),
 273                 },
 274                 .driver_data = &quirk_dell_vostro_v130,
 275         },
 276         {
 277                 .callback = dmi_matched,
 278                 .ident = "Dell Inspiron 7520",
 279                 .matches = {
 280                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 281                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
 282                 },
 283                 .driver_data = &quirk_dell_vostro_v130,
 284         },
 285         {
 286                 .callback = dmi_matched,
 287                 .ident = "Dell Inspiron 7720",
 288                 .matches = {
 289                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 290                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
 291                 },
 292                 .driver_data = &quirk_dell_vostro_v130,
 293         },
 294         {
 295                 .callback = dmi_matched,
 296                 .ident = "Dell XPS13 9333",
 297                 .matches = {
 298                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 299                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
 300                 },
 301                 .driver_data = &quirk_dell_xps13_9333,
 302         },
 303         {
 304                 .callback = dmi_matched,
 305                 .ident = "Dell XPS 13 9370",
 306                 .matches = {
 307                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 308                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS 13 9370"),
 309                 },
 310                 .driver_data = &quirk_dell_xps13_9370,
 311         },
 312         {
 313                 .callback = dmi_matched,
 314                 .ident = "Dell Latitude E6410",
 315                 .matches = {
 316                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 317                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6410"),
 318                 },
 319                 .driver_data = &quirk_dell_latitude_e6410,
 320         },
 321         {
 322                 .callback = dmi_matched,
 323                 .ident = "Dell Inspiron 1012",
 324                 .matches = {
 325                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 326                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"),
 327                 },
 328                 .driver_data = &quirk_dell_inspiron_1012,
 329         },
 330         {
 331                 .callback = dmi_matched,
 332                 .ident = "Dell Inspiron 1018",
 333                 .matches = {
 334                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 335                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1018"),
 336                 },
 337                 .driver_data = &quirk_dell_inspiron_1012,
 338         },
 339         { }
 340 };
 341
 342 static void dell_fill_request(struct calling_interface_buffer *buffer,
 343                                u32 arg0, u32 arg1, u32 arg2, u32 arg3)
 344 {
 345         memset(buffer, 0, sizeof(struct calling_interface_buffer));
 346         buffer->input[0] = arg0;
 347         buffer->input[1] = arg1;
 348         buffer->input[2] = arg2;
 349         buffer->input[3] = arg3;
 350 }
 351
 352 static int dell_send_request(struct calling_interface_buffer *buffer,
 353                              u16 class, u16 select)
 354 {
 355         int ret;
 356
 357         buffer->cmd_class = class;
 358         buffer->cmd_select = select;
 359         ret = dell_smbios_call(buffer);
 360         if (ret != 0)
 361                 return ret;
 362         return dell_smbios_error(buffer->output[0]);
 363 }
 364
 365 /*
 366  * Derived from information in smbios-wireless-ctl:
 367  *
 368  * cbSelect 17, Value 11
 369  *
 370  * Return Wireless Info
 371  * cbArg1, byte0 = 0x00
 372  *
 373  *     cbRes1 Standard return codes (0, -1, -2)
 374  *     cbRes2 Info bit flags:
 375  *
 376  *     0 Hardware switch supported (1)
 377  *     1 WiFi locator supported (1)
 378  *     2 WLAN supported (1)
 379  *     3 Bluetooth (BT) supported (1)
 380  *     4 WWAN supported (1)
 381  *     5 Wireless KBD supported (1)
 382  *     6 Uw b supported (1)
 383  *     7 WiGig supported (1)
 384  *     8 WLAN installed (1)
 385  *     9 BT installed (1)
 386  *     10 WWAN installed (1)
 387  *     11 Uw b installed (1)
 388  *     12 WiGig installed (1)
 389  *     13-15 Reserved (0)
 390  *     16 Hardware (HW) switch is On (1)
 391  *     17 WLAN disabled (1)
 392  *     18 BT disabled (1)
 393  *     19 WWAN disabled (1)
 394  *     20 Uw b disabled (1)
 395  *     21 WiGig disabled (1)
 396  *     20-31 Reserved (0)
 397  *
 398  *     cbRes3 NVRAM size in bytes
 399  *     cbRes4, byte 0 NVRAM format version number
 400  *
 401  *
 402  * Set QuickSet Radio Disable Flag
 403  *     cbArg1, byte0 = 0x01
 404  *     cbArg1, byte1
 405  *     Radio ID     value:
 406  *     0        Radio Status
 407  *     1        WLAN ID
 408  *     2        BT ID
 409  *     3        WWAN ID
 410  *     4        UWB ID
 411  *     5        WIGIG ID
 412  *     cbArg1, byte2    Flag bits:
 413  *             0 QuickSet disables radio (1)
 414  *             1-7 Reserved (0)
 415  *
 416  *     cbRes1    Standard return codes (0, -1, -2)
 417  *     cbRes2    QuickSet (QS) radio disable bit map:
 418  *     0 QS disables WLAN
 419  *     1 QS disables BT
 420  *     2 QS disables WWAN
 421  *     3 QS disables UWB
 422  *     4 QS disables WIGIG
 423  *     5-31 Reserved (0)
 424  *
 425  * Wireless Switch Configuration
 426  *     cbArg1, byte0 = 0x02
 427  *
 428  *     cbArg1, byte1
 429  *     Subcommand:
 430  *     0 Get config
 431  *     1 Set config
 432  *     2 Set WiFi locator enable/disable
 433  *     cbArg1,byte2
 434  *     Switch settings (if byte 1==1):
 435  *     0 WLAN sw itch control (1)
 436  *     1 BT sw itch control (1)
 437  *     2 WWAN sw itch control (1)
 438  *     3 UWB sw itch control (1)
 439  *     4 WiGig sw itch control (1)
 440  *     5-7 Reserved (0)
 441  *    cbArg1, byte2 Enable bits (if byte 1==2):
 442  *     0 Enable WiFi locator (1)
 443  *
 444  *    cbRes1     Standard return codes (0, -1, -2)
 445  *    cbRes2 QuickSet radio disable bit map:
 446  *     0 WLAN controlled by sw itch (1)
 447  *     1 BT controlled by sw itch (1)
 448  *     2 WWAN controlled by sw itch (1)
 449  *     3 UWB controlled by sw itch (1)
 450  *     4 WiGig controlled by sw itch (1)
 451  *     5-6 Reserved (0)
 452  *     7 Wireless sw itch config locked (1)
 453  *     8 WiFi locator enabled (1)
 454  *     9-14 Reserved (0)
 455  *     15 WiFi locator setting locked (1)
 456  *     16-31 Reserved (0)
 457  *
 458  * Read Local Config Data (LCD)
 459  *     cbArg1, byte0 = 0x10
 460  *     cbArg1, byte1 NVRAM index low byte
 461  *     cbArg1, byte2 NVRAM index high byte
 462  *     cbRes1 Standard return codes (0, -1, -2)
 463  *     cbRes2 4 bytes read from LCD[index]
 464  *     cbRes3 4 bytes read from LCD[index+4]
 465  *     cbRes4 4 bytes read from LCD[index+8]
 466  *
 467  * Write Local Config Data (LCD)
 468  *     cbArg1, byte0 = 0x11
 469  *     cbArg1, byte1 NVRAM index low byte
 470  *     cbArg1, byte2 NVRAM index high byte
 471  *     cbArg2 4 bytes to w rite at LCD[index]
 472  *     cbArg3 4 bytes to w rite at LCD[index+4]
 473  *     cbArg4 4 bytes to w rite at LCD[index+8]
 474  *     cbRes1 Standard return codes (0, -1, -2)
 475  *
 476  * Populate Local Config Data from NVRAM
 477  *     cbArg1, byte0 = 0x12
 478  *     cbRes1 Standard return codes (0, -1, -2)
 479  *
 480  * Commit Local Config Data to NVRAM
 481  *     cbArg1, byte0 = 0x13
 482  *     cbRes1 Standard return codes (0, -1, -2)
 483  */
 484
 485 static int dell_rfkill_set(void *data, bool blocked)
 486 {
 487         int disable = blocked ? 1 : 0;
 488         unsigned long radio = (unsigned long)data;
 489         int hwswitch_bit = (unsigned long)data - 1;
 490         struct calling_interface_buffer buffer;
 491         int hwswitch;
 492         int status;
 493         int ret;
 494
 495         dell_fill_request(&buffer, 0, 0, 0, 0);
 496         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 497         if (ret)
 498                 return ret;
 499         status = buffer.output[1];
 500
 501         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 502         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 503         if (ret)
 504                 return ret;
 505         hwswitch = buffer.output[1];
 506
 507         /* If the hardware switch controls this radio, and the hardware
 508            switch is disabled, always disable the radio */
 509         if (ret == 0 && (hwswitch & BIT(hwswitch_bit)) &&
 510             (status & BIT(0)) && !(status & BIT(16)))
 511                 disable = 1;
 512
 513         dell_fill_request(&buffer, 1 | (radio<<8) | (disable << 16), 0, 0, 0);
 514         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 515         return ret;
 516 }
 517
 518 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
 519                                         int status)
 520 {
 521         if (status & BIT(0)) {
 522                 /* Has hw-switch, sync sw_state to BIOS */
 523                 struct calling_interface_buffer buffer;
 524                 int block = rfkill_blocked(rfkill);
 525                 dell_fill_request(&buffer,
 526                                    1 | (radio << 8) | (block << 16), 0, 0, 0);
 527                 dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 528         } else {
 529                 /* No hw-switch, sync BIOS state to sw_state */
 530                 rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
 531         }
 532 }
 533
 534 static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
 535                                         int status, int hwswitch)
 536 {
 537         if (hwswitch & (BIT(radio - 1)))
 538                 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
 539 }
 540
 541 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 542 {
 543         int radio = ((unsigned long)data & 0xF);
 544         struct calling_interface_buffer buffer;
 545         int hwswitch;
 546         int status;
 547         int ret;
 548
 549         dell_fill_request(&buffer, 0, 0, 0, 0);
 550         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 551         status = buffer.output[1];
 552
 553         if (ret != 0 || !(status & BIT(0))) {
 554                 return;
 555         }
 556
 557         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 558         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 559         hwswitch = buffer.output[1];
 560
 561         if (ret != 0)
 562                 return;
 563
 564         dell_rfkill_update_hw_state(rfkill, radio, status, hwswitch);
 565 }
 566
 567 static const struct rfkill_ops dell_rfkill_ops = {
 568         .set_block = dell_rfkill_set,
 569         .query = dell_rfkill_query,
 570 };
 571
 572 static struct dentry *dell_laptop_dir;
 573
 574 static int dell_debugfs_show(struct seq_file *s, void *data)
 575 {
 576         struct calling_interface_buffer buffer;
 577         int hwswitch_state;
 578         int hwswitch_ret;
 579         int status;
 580         int ret;
 581
 582         dell_fill_request(&buffer, 0, 0, 0, 0);
 583         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 584         if (ret)
 585                 return ret;
 586         status = buffer.output[1];
 587
 588         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 589         hwswitch_ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 590         if (hwswitch_ret)
 591                 return hwswitch_ret;
 592         hwswitch_state = buffer.output[1];
 593
 594         seq_printf(s, "return:\t%d\n", ret);
 595         seq_printf(s, "status:\t0x%X\n", status);
 596         seq_printf(s, "Bit 0 : Hardware switch supported:   %lu\n",
 597                    status & BIT(0));
 598         seq_printf(s, "Bit 1 : Wifi locator supported:      %lu\n",
 599                   (status & BIT(1)) >> 1);
 600         seq_printf(s, "Bit 2 : Wifi is supported:           %lu\n",
 601                   (status & BIT(2)) >> 2);
 602         seq_printf(s, "Bit 3 : Bluetooth is supported:      %lu\n",
 603                   (status & BIT(3)) >> 3);
 604         seq_printf(s, "Bit 4 : WWAN is supported:           %lu\n",
 605                   (status & BIT(4)) >> 4);
 606         seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
 607                   (status & BIT(5)) >> 5);
 608         seq_printf(s, "Bit 6 : UWB supported:               %lu\n",
 609                   (status & BIT(6)) >> 6);
 610         seq_printf(s, "Bit 7 : WiGig supported:             %lu\n",
 611                   (status & BIT(7)) >> 7);
 612         seq_printf(s, "Bit 8 : Wifi is installed:           %lu\n",
 613                   (status & BIT(8)) >> 8);
 614         seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
 615                   (status & BIT(9)) >> 9);
 616         seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
 617                   (status & BIT(10)) >> 10);
 618         seq_printf(s, "Bit 11: UWB installed:               %lu\n",
 619                   (status & BIT(11)) >> 11);
 620         seq_printf(s, "Bit 12: WiGig installed:             %lu\n",
 621                   (status & BIT(12)) >> 12);
 622
 623         seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
 624                   (status & BIT(16)) >> 16);
 625         seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
 626                   (status & BIT(17)) >> 17);
 627         seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
 628                   (status & BIT(18)) >> 18);
 629         seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
 630                   (status & BIT(19)) >> 19);
 631         seq_printf(s, "Bit 20: UWB is blocked:              %lu\n",
 632                   (status & BIT(20)) >> 20);
 633         seq_printf(s, "Bit 21: WiGig is blocked:            %lu\n",
 634                   (status & BIT(21)) >> 21);
 635
 636         seq_printf(s, "\nhwswitch_return:\t%d\n", hwswitch_ret);
 637         seq_printf(s, "hwswitch_state:\t0x%X\n", hwswitch_state);
 638         seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
 639                    hwswitch_state & BIT(0));
 640         seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
 641                    (hwswitch_state & BIT(1)) >> 1);
 642         seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
 643                    (hwswitch_state & BIT(2)) >> 2);
 644         seq_printf(s, "Bit 3 : UWB controlled by switch:       %lu\n",
 645                    (hwswitch_state & BIT(3)) >> 3);
 646         seq_printf(s, "Bit 4 : WiGig controlled by switch:     %lu\n",
 647                    (hwswitch_state & BIT(4)) >> 4);
 648         seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
 649                    (hwswitch_state & BIT(7)) >> 7);
 650         seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
 651                    (hwswitch_state & BIT(8)) >> 8);
 652         seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
 653                    (hwswitch_state & BIT(15)) >> 15);
 654
 655         return 0;
 656 }
 657 DEFINE_SHOW_ATTRIBUTE(dell_debugfs);
 658
 659 static void dell_update_rfkill(struct work_struct *ignored)
 660 {
 661         struct calling_interface_buffer buffer;
 662         int hwswitch = 0;
 663         int status;
 664         int ret;
 665
 666         dell_fill_request(&buffer, 0, 0, 0, 0);
 667         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 668         status = buffer.output[1];
 669
 670         if (ret != 0)
 671                 return;
 672
 673         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 674         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 675
 676         if (ret == 0 && (status & BIT(0)))
 677                 hwswitch = buffer.output[1];
 678
 679         if (wifi_rfkill) {
 680                 dell_rfkill_update_hw_state(wifi_rfkill, 1, status, hwswitch);
 681                 dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
 682         }
 683         if (bluetooth_rfkill) {
 684                 dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status,
 685                                             hwswitch);
 686                 dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
 687         }
 688         if (wwan_rfkill) {
 689                 dell_rfkill_update_hw_state(wwan_rfkill, 3, status, hwswitch);
 690                 dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
 691         }
 692 }
 693 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
 694
 695 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
 696                               struct serio *port)
 697 {
 698         static bool extended;
 699
 700         if (str & I8042_STR_AUXDATA)
 701                 return false;
 702
 703         if (unlikely(data == 0xe0)) {
 704                 extended = true;
 705                 return false;
 706         } else if (unlikely(extended)) {
 707                 switch (data) {
 708                 case 0x8:
 709                         schedule_delayed_work(&dell_rfkill_work,
 710                                               round_jiffies_relative(HZ / 4));
 711                         break;
 712                 }
 713                 extended = false;
 714         }
 715
 716         return false;
 717 }
 718
 719 static int (*dell_rbtn_notifier_register_func)(struct notifier_block *);
 720 static int (*dell_rbtn_notifier_unregister_func)(struct notifier_block *);
 721
 722 static int dell_laptop_rbtn_notifier_call(struct notifier_block *nb,
 723                                           unsigned long action, void *data)
 724 {
 725         schedule_delayed_work(&dell_rfkill_work, 0);
 726         return NOTIFY_OK;
 727 }
 728
 729 static struct notifier_block dell_laptop_rbtn_notifier = {
 730         .notifier_call = dell_laptop_rbtn_notifier_call,
 731 };
 732
 733 static int __init dell_setup_rfkill(void)
 734 {
 735         struct calling_interface_buffer buffer;
 736         int status, ret, whitelisted;
 737         const char *product;
 738
 739         /*
 740          * rfkill support causes trouble on various models, mostly Inspirons.
 741          * So we whitelist certain series, and don't support rfkill on others.
 742          */
 743         whitelisted = 0;
 744         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 745         if (product &&  (strncmp(product, "Latitude", 8) == 0 ||
 746                          strncmp(product, "Precision", 9) == 0))
 747                 whitelisted = 1;
 748         if (!force_rfkill && !whitelisted)
 749                 return 0;
 750
 751         dell_fill_request(&buffer, 0, 0, 0, 0);
 752         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 753         status = buffer.output[1];
 754
 755         /* dell wireless info smbios call is not supported */
 756         if (ret != 0)
 757                 return 0;
 758
 759         /* rfkill is only tested on laptops with a hwswitch */
 760         if (!(status & BIT(0)) && !force_rfkill)
 761                 return 0;
 762
 763         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 764                 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
 765                                            RFKILL_TYPE_WLAN,
 766                                            &dell_rfkill_ops, (void *) 1);
 767                 if (!wifi_rfkill) {
 768                         ret = -ENOMEM;
 769                         goto err_wifi;
 770                 }
 771                 ret = rfkill_register(wifi_rfkill);
 772                 if (ret)
 773                         goto err_wifi;
 774         }
 775
 776         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 777                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
 778                                                 &platform_device->dev,
 779                                                 RFKILL_TYPE_BLUETOOTH,
 780                                                 &dell_rfkill_ops, (void *) 2);
 781                 if (!bluetooth_rfkill) {
 782                         ret = -ENOMEM;
 783                         goto err_bluetooth;
 784                 }
 785                 ret = rfkill_register(bluetooth_rfkill);
 786                 if (ret)
 787                         goto err_bluetooth;
 788         }
 789
 790         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 791                 wwan_rfkill = rfkill_alloc("dell-wwan",
 792                                            &platform_device->dev,
 793                                            RFKILL_TYPE_WWAN,
 794                                            &dell_rfkill_ops, (void *) 3);
 795                 if (!wwan_rfkill) {
 796                         ret = -ENOMEM;
 797                         goto err_wwan;
 798                 }
 799                 ret = rfkill_register(wwan_rfkill);
 800                 if (ret)
 801                         goto err_wwan;
 802         }
 803
 804         /*
 805          * Dell Airplane Mode Switch driver (dell-rbtn) supports ACPI devices
 806          * which can receive events from HW slider switch.
 807          *
 808          * Dell SMBIOS on whitelisted models supports controlling radio devices
 809          * but does not support receiving HW button switch events. We can use
 810          * i8042 filter hook function to receive keyboard data and handle
 811          * keycode for HW button.
 812          *
 813          * So if it is possible we will use Dell Airplane Mode Switch ACPI
 814          * driver for receiving HW events and Dell SMBIOS for setting rfkill
 815          * states. If ACPI driver or device is not available we will fallback to
 816          * i8042 filter hook function.
 817          *
 818          * To prevent duplicate rfkill devices which control and do same thing,
 819          * dell-rbtn driver will automatically remove its own rfkill devices
 820          * once function dell_rbtn_notifier_register() is called.
 821          */
 822
 823         dell_rbtn_notifier_register_func =
 824                 symbol_request(dell_rbtn_notifier_register);
 825         if (dell_rbtn_notifier_register_func) {
 826                 dell_rbtn_notifier_unregister_func =
 827                         symbol_request(dell_rbtn_notifier_unregister);
 828                 if (!dell_rbtn_notifier_unregister_func) {
 829                         symbol_put(dell_rbtn_notifier_register);
 830                         dell_rbtn_notifier_register_func = NULL;
 831                 }
 832         }
 833
 834         if (dell_rbtn_notifier_register_func) {
 835                 ret = dell_rbtn_notifier_register_func(
 836                         &dell_laptop_rbtn_notifier);
 837                 symbol_put(dell_rbtn_notifier_register);
 838                 dell_rbtn_notifier_register_func = NULL;
 839                 if (ret != 0) {
 840                         symbol_put(dell_rbtn_notifier_unregister);
 841                         dell_rbtn_notifier_unregister_func = NULL;
 842                 }
 843         } else {
 844                 pr_info("Symbols from dell-rbtn acpi driver are not available\n");
 845                 ret = -ENODEV;
 846         }
 847
 848         if (ret == 0) {
 849                 pr_info("Using dell-rbtn acpi driver for receiving events\n");
 850         } else if (ret != -ENODEV) {
 851                 pr_warn("Unable to register dell rbtn notifier\n");
 852                 goto err_filter;
 853         } else {
 854                 ret = i8042_install_filter(dell_laptop_i8042_filter);
 855                 if (ret) {
 856                         pr_warn("Unable to install key filter\n");
 857                         goto err_filter;
 858                 }
 859                 pr_info("Using i8042 filter function for receiving events\n");
 860         }
 861
 862         return 0;
 863 err_filter:
 864         if (wwan_rfkill)
 865                 rfkill_unregister(wwan_rfkill);
 866 err_wwan:
 867         rfkill_destroy(wwan_rfkill);
 868         if (bluetooth_rfkill)
 869                 rfkill_unregister(bluetooth_rfkill);
 870 err_bluetooth:
 871         rfkill_destroy(bluetooth_rfkill);
 872         if (wifi_rfkill)
 873                 rfkill_unregister(wifi_rfkill);
 874 err_wifi:
 875         rfkill_destroy(wifi_rfkill);
 876
 877         return ret;
 878 }
 879
 880 static void dell_cleanup_rfkill(void)
 881 {
 882         if (dell_rbtn_notifier_unregister_func) {
 883                 dell_rbtn_notifier_unregister_func(&dell_laptop_rbtn_notifier);
 884                 symbol_put(dell_rbtn_notifier_unregister);
 885                 dell_rbtn_notifier_unregister_func = NULL;
 886         } else {
 887                 i8042_remove_filter(dell_laptop_i8042_filter);
 888         }
 889         cancel_delayed_work_sync(&dell_rfkill_work);
 890         if (wifi_rfkill) {
 891                 rfkill_unregister(wifi_rfkill);
 892                 rfkill_destroy(wifi_rfkill);
 893         }
 894         if (bluetooth_rfkill) {
 895                 rfkill_unregister(bluetooth_rfkill);
 896                 rfkill_destroy(bluetooth_rfkill);
 897         }
 898         if (wwan_rfkill) {
 899                 rfkill_unregister(wwan_rfkill);
 900                 rfkill_destroy(wwan_rfkill);
 901         }
 902 }
 903
 904 static int dell_send_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,
 915                            token->location, bd->props.brightness, 0, 0);
 916         if (power_supply_is_system_supplied() > 0)
 917                 ret = dell_send_request(&buffer,
 918                                         CLASS_TOKEN_WRITE, SELECT_TOKEN_AC);
 919         else
 920                 ret = dell_send_request(&buffer,
 921                                         CLASS_TOKEN_WRITE, SELECT_TOKEN_BAT);
 922
 923         return ret;
 924 }
 925
 926 static int dell_get_intensity(struct backlight_device *bd)
 927 {
 928         struct calling_interface_buffer buffer;
 929         struct calling_interface_token *token;
 930         int ret;
 931
 932         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
 933         if (!token)
 934                 return -ENODEV;
 935
 936         dell_fill_request(&buffer, token->location, 0, 0, 0);
 937         if (power_supply_is_system_supplied() > 0)
 938                 ret = dell_send_request(&buffer,
 939                                         CLASS_TOKEN_READ, SELECT_TOKEN_AC);
 940         else
 941                 ret = dell_send_request(&buffer,
 942                                         CLASS_TOKEN_READ, SELECT_TOKEN_BAT);
 943
 944         if (ret == 0)
 945                 ret = buffer.output[1];
 946
 947         return ret;
 948 }
 949
 950 static const struct backlight_ops dell_ops = {
 951         .get_brightness = dell_get_intensity,
 952         .update_status  = dell_send_intensity,
 953 };
 954
 955 static void touchpad_led_on(void)
 956 {
 957         int command = 0x97;
 958         char data = 1;
 959         i8042_command(&data, command | 1 << 12);
 960 }
 961
 962 static void touchpad_led_off(void)
 963 {
 964         int command = 0x97;
 965         char data = 2;
 966         i8042_command(&data, command | 1 << 12);
 967 }
 968
 969 static void touchpad_led_set(struct led_classdev *led_cdev,
 970         enum led_brightness value)
 971 {
 972         if (value > 0)
 973                 touchpad_led_on();
 974         else
 975                 touchpad_led_off();
 976 }
 977
 978 static struct led_classdev touchpad_led = {
 979         .name = "dell-laptop::touchpad",
 980         .brightness_set = touchpad_led_set,
 981         .flags = LED_CORE_SUSPENDRESUME,
 982 };
 983
 984 static int __init touchpad_led_init(struct device *dev)
 985 {
 986         return led_classdev_register(dev, &touchpad_led);
 987 }
 988
 989 static void touchpad_led_exit(void)
 990 {
 991         led_classdev_unregister(&touchpad_led);
 992 }
 993
 994 /*
 995  * Derived from information in smbios-keyboard-ctl:
 996  *
 997  * cbClass 4
 998  * cbSelect 11
 999  * Keyboard illumination
1000  * cbArg1 determines the function to be performed
1001  *
1002  * cbArg1 0x0 = Get Feature Information
1003  *  cbRES1         Standard return codes (0, -1, -2)
1004  *  cbRES2, word0  Bitmap of user-selectable modes
1005  *     bit 0     Always off (All systems)
1006  *     bit 1     Always on (Travis ATG, Siberia)
1007  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1008  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1009  *     bit 4     Auto: Input-activity-based On; input-activity based Off
1010  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1011  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1012  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1013  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1014  *     bits 9-15 Reserved for future use
1015  *  cbRES2, byte2  Reserved for future use
1016  *  cbRES2, byte3  Keyboard illumination type
1017  *     0         Reserved
1018  *     1         Tasklight
1019  *     2         Backlight
1020  *     3-255     Reserved for future use
1021  *  cbRES3, byte0  Supported auto keyboard illumination trigger bitmap.
1022  *     bit 0     Any keystroke
1023  *     bit 1     Touchpad activity
1024  *     bit 2     Pointing stick
1025  *     bit 3     Any mouse
1026  *     bits 4-7  Reserved for future use
1027  *  cbRES3, byte1  Supported timeout unit bitmap
1028  *     bit 0     Seconds
1029  *     bit 1     Minutes
1030  *     bit 2     Hours
1031  *     bit 3     Days
1032  *     bits 4-7  Reserved for future use
1033  *  cbRES3, byte2  Number of keyboard light brightness levels
1034  *  cbRES4, byte0  Maximum acceptable seconds value (0 if seconds not supported).
1035  *  cbRES4, byte1  Maximum acceptable minutes value (0 if minutes not supported).
1036  *  cbRES4, byte2  Maximum acceptable hours value (0 if hours not supported).
1037  *  cbRES4, byte3  Maximum acceptable days value (0 if days not supported)
1038  *
1039  * cbArg1 0x1 = Get Current State
1040  *  cbRES1         Standard return codes (0, -1, -2)
1041  *  cbRES2, word0  Bitmap of current mode state
1042  *     bit 0     Always off (All systems)
1043  *     bit 1     Always on (Travis ATG, Siberia)
1044  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1045  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1046  *     bit 4     Auto: Input-activity-based On; input-activity based Off
1047  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1048  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1049  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1050  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1051  *     bits 9-15 Reserved for future use
1052  *     Note: Only One bit can be set
1053  *  cbRES2, byte2  Currently active auto keyboard illumination triggers.
1054  *     bit 0     Any keystroke
1055  *     bit 1     Touchpad activity
1056  *     bit 2     Pointing stick
1057  *     bit 3     Any mouse
1058  *     bits 4-7  Reserved for future use
1059  *  cbRES2, byte3  Current Timeout on battery
1060  *     bits 7:6  Timeout units indicator:
1061  *     00b       Seconds
1062  *     01b       Minutes
1063  *     10b       Hours
1064  *     11b       Days
1065  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1066  *     NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte
1067  *     are set upon return from the [Get feature information] call.
1068  *  cbRES3, byte0  Current setting of ALS value that turns the light on or off.
1069  *  cbRES3, byte1  Current ALS reading
1070  *  cbRES3, byte2  Current keyboard light level.
1071  *  cbRES3, byte3  Current timeout on AC Power
1072  *     bits 7:6  Timeout units indicator:
1073  *     00b       Seconds
1074  *     01b       Minutes
1075  *     10b       Hours
1076  *     11b       Days
1077  *     Bits 5:0  Timeout value (0-63) in sec/min/hr/day
1078  *     NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte2
1079  *     are set upon return from the upon return from the [Get Feature information] call.
1080  *
1081  * cbArg1 0x2 = Set New State
1082  *  cbRES1         Standard return codes (0, -1, -2)
1083  *  cbArg2, word0  Bitmap of current mode state
1084  *     bit 0     Always off (All systems)
1085  *     bit 1     Always on (Travis ATG, Siberia)
1086  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1087  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1088  *     bit 4     Auto: Input-activity-based On; input-activity based Off
1089  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1090  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1091  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1092  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1093  *     bits 9-15 Reserved for future use
1094  *     Note: Only One bit can be set
1095  *  cbArg2, byte2  Desired auto keyboard illumination triggers. Must remain inactive to allow
1096  *                 keyboard to turn off automatically.
1097  *     bit 0     Any keystroke
1098  *     bit 1     Touchpad activity
1099  *     bit 2     Pointing stick
1100  *     bit 3     Any mouse
1101  *     bits 4-7  Reserved for future use
1102  *  cbArg2, byte3  Desired Timeout on battery
1103  *     bits 7:6  Timeout units indicator:
1104  *     00b       Seconds
1105  *     01b       Minutes
1106  *     10b       Hours
1107  *     11b       Days
1108  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1109  *  cbArg3, byte0  Desired setting of ALS value that turns the light on or off.
1110  *  cbArg3, byte2  Desired keyboard light level.
1111  *  cbArg3, byte3  Desired Timeout on AC power
1112  *     bits 7:6  Timeout units indicator:
1113  *     00b       Seconds
1114  *     01b       Minutes
1115  *     10b       Hours
1116  *     11b       Days
1117  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1118  */
1119
1120
1121 enum kbd_timeout_unit {
1122         KBD_TIMEOUT_SECONDS = 0,
1123         KBD_TIMEOUT_MINUTES,
1124         KBD_TIMEOUT_HOURS,
1125         KBD_TIMEOUT_DAYS,
1126 };
1127
1128 enum kbd_mode_bit {
1129         KBD_MODE_BIT_OFF = 0,
1130         KBD_MODE_BIT_ON,
1131         KBD_MODE_BIT_ALS,
1132         KBD_MODE_BIT_TRIGGER_ALS,
1133         KBD_MODE_BIT_TRIGGER,
1134         KBD_MODE_BIT_TRIGGER_25,
1135         KBD_MODE_BIT_TRIGGER_50,
1136         KBD_MODE_BIT_TRIGGER_75,
1137         KBD_MODE_BIT_TRIGGER_100,
1138 };
1139
1140 #define kbd_is_als_mode_bit(bit) \
1141         ((bit) == KBD_MODE_BIT_ALS || (bit) == KBD_MODE_BIT_TRIGGER_ALS)
1142 #define kbd_is_trigger_mode_bit(bit) \
1143         ((bit) >= KBD_MODE_BIT_TRIGGER_ALS && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1144 #define kbd_is_level_mode_bit(bit) \
1145         ((bit) >= KBD_MODE_BIT_TRIGGER_25 && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1146
1147 struct kbd_info {
1148         u16 modes;
1149         u8 type;
1150         u8 triggers;
1151         u8 levels;
1152         u8 seconds;
1153         u8 minutes;
1154         u8 hours;
1155         u8 days;
1156 };
1157
1158 struct kbd_state {
1159         u8 mode_bit;
1160         u8 triggers;
1161         u8 timeout_value;
1162         u8 timeout_unit;
1163         u8 timeout_value_ac;
1164         u8 timeout_unit_ac;
1165         u8 als_setting;
1166         u8 als_value;
1167         u8 level;
1168 };
1169
1170 static const int kbd_tokens[] = {
1171         KBD_LED_OFF_TOKEN,
1172         KBD_LED_AUTO_25_TOKEN,
1173         KBD_LED_AUTO_50_TOKEN,
1174         KBD_LED_AUTO_75_TOKEN,
1175         KBD_LED_AUTO_100_TOKEN,
1176         KBD_LED_ON_TOKEN,
1177 };
1178
1179 static u16 kbd_token_bits;
1180
1181 static struct kbd_info kbd_info;
1182 static bool kbd_als_supported;
1183 static bool kbd_triggers_supported;
1184 static bool kbd_timeout_ac_supported;
1185
1186 static u8 kbd_mode_levels[16];
1187 static int kbd_mode_levels_count;
1188
1189 static u8 kbd_previous_level;
1190 static u8 kbd_previous_mode_bit;
1191
1192 static bool kbd_led_present;
1193 static DEFINE_MUTEX(kbd_led_mutex);
1194 static enum led_brightness kbd_led_level;
1195
1196 /*
1197  * NOTE: there are three ways to set the keyboard backlight level.
1198  * First, via kbd_state.mode_bit (assigning KBD_MODE_BIT_TRIGGER_* value).
1199  * Second, via kbd_state.level (assigning numerical value <= kbd_info.levels).
1200  * Third, via SMBIOS tokens (KBD_LED_* in kbd_tokens)
1201  *
1202  * There are laptops which support only one of these methods. If we want to
1203  * support as many machines as possible we need to implement all three methods.
1204  * The first two methods use the kbd_state structure. The third uses SMBIOS
1205  * tokens. If kbd_info.levels == 0, the machine does not support setting the
1206  * keyboard backlight level via kbd_state.level.
1207  */
1208
1209 static int kbd_get_info(struct kbd_info *info)
1210 {
1211         struct calling_interface_buffer buffer;
1212         u8 units;
1213         int ret;
1214
1215         dell_fill_request(&buffer, 0, 0, 0, 0);
1216         ret = dell_send_request(&buffer,
1217                                 CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1218         if (ret)
1219                 return ret;
1220
1221         info->modes = buffer.output[1] & 0xFFFF;
1222         info->type = (buffer.output[1] >> 24) & 0xFF;
1223         info->triggers = buffer.output[2] & 0xFF;
1224         units = (buffer.output[2] >> 8) & 0xFF;
1225         info->levels = (buffer.output[2] >> 16) & 0xFF;
1226
1227         if (quirks && quirks->kbd_led_levels_off_1 && info->levels)
1228                 info->levels--;
1229
1230         if (units & BIT(0))
1231                 info->seconds = (buffer.output[3] >> 0) & 0xFF;
1232         if (units & BIT(1))
1233                 info->minutes = (buffer.output[3] >> 8) & 0xFF;
1234         if (units & BIT(2))
1235                 info->hours = (buffer.output[3] >> 16) & 0xFF;
1236         if (units & BIT(3))
1237                 info->days = (buffer.output[3] >> 24) & 0xFF;
1238
1239         return ret;
1240 }
1241
1242 static unsigned int kbd_get_max_level(void)
1243 {
1244         if (kbd_info.levels != 0)
1245                 return kbd_info.levels;
1246         if (kbd_mode_levels_count > 0)
1247                 return kbd_mode_levels_count - 1;
1248         return 0;
1249 }
1250
1251 static int kbd_get_level(struct kbd_state *state)
1252 {
1253         int i;
1254
1255         if (kbd_info.levels != 0)
1256                 return state->level;
1257
1258         if (kbd_mode_levels_count > 0) {
1259                 for (i = 0; i < kbd_mode_levels_count; ++i)
1260                         if (kbd_mode_levels[i] == state->mode_bit)
1261                                 return i;
1262                 return 0;
1263         }
1264
1265         return -EINVAL;
1266 }
1267
1268 static int kbd_set_level(struct kbd_state *state, u8 level)
1269 {
1270         if (kbd_info.levels != 0) {
1271                 if (level != 0)
1272                         kbd_previous_level = level;
1273                 if (state->level == level)
1274                         return 0;
1275                 state->level = level;
1276                 if (level != 0 && state->mode_bit == KBD_MODE_BIT_OFF)
1277                         state->mode_bit = kbd_previous_mode_bit;
1278                 else if (level == 0 && state->mode_bit != KBD_MODE_BIT_OFF) {
1279                         kbd_previous_mode_bit = state->mode_bit;
1280                         state->mode_bit = KBD_MODE_BIT_OFF;
1281                 }
1282                 return 0;
1283         }
1284
1285         if (kbd_mode_levels_count > 0 && level < kbd_mode_levels_count) {
1286                 if (level != 0)
1287                         kbd_previous_level = level;
1288                 state->mode_bit = kbd_mode_levels[level];
1289                 return 0;
1290         }
1291
1292         return -EINVAL;
1293 }
1294
1295 static int kbd_get_state(struct kbd_state *state)
1296 {
1297         struct calling_interface_buffer buffer;
1298         int ret;
1299
1300         dell_fill_request(&buffer, 0x1, 0, 0, 0);
1301         ret = dell_send_request(&buffer,
1302                                 CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1303         if (ret)
1304                 return ret;
1305
1306         state->mode_bit = ffs(buffer.output[1] & 0xFFFF);
1307         if (state->mode_bit != 0)
1308                 state->mode_bit--;
1309
1310         state->triggers = (buffer.output[1] >> 16) & 0xFF;
1311         state->timeout_value = (buffer.output[1] >> 24) & 0x3F;
1312         state->timeout_unit = (buffer.output[1] >> 30) & 0x3;
1313         state->als_setting = buffer.output[2] & 0xFF;
1314         state->als_value = (buffer.output[2] >> 8) & 0xFF;
1315         state->level = (buffer.output[2] >> 16) & 0xFF;
1316         state->timeout_value_ac = (buffer.output[2] >> 24) & 0x3F;
1317         state->timeout_unit_ac = (buffer.output[2] >> 30) & 0x3;
1318
1319         return ret;
1320 }
1321
1322 static int kbd_set_state(struct kbd_state *state)
1323 {
1324         struct calling_interface_buffer buffer;
1325         int ret;
1326         u32 input1;
1327         u32 input2;
1328
1329         input1 = BIT(state->mode_bit) & 0xFFFF;
1330         input1 |= (state->triggers & 0xFF) << 16;
1331         input1 |= (state->timeout_value & 0x3F) << 24;
1332         input1 |= (state->timeout_unit & 0x3) << 30;
1333         input2 = state->als_setting & 0xFF;
1334         input2 |= (state->level & 0xFF) << 16;
1335         input2 |= (state->timeout_value_ac & 0x3F) << 24;
1336         input2 |= (state->timeout_unit_ac & 0x3) << 30;
1337         dell_fill_request(&buffer, 0x2, input1, input2, 0);
1338         ret = dell_send_request(&buffer,
1339                                 CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1340
1341         return ret;
1342 }
1343
1344 static int kbd_set_state_safe(struct kbd_state *state, struct kbd_state *old)
1345 {
1346         int ret;
1347
1348         ret = kbd_set_state(state);
1349         if (ret == 0)
1350                 return 0;
1351
1352         /*
1353          * When setting the new state fails,try to restore the previous one.
1354          * This is needed on some machines where BIOS sets a default state when
1355          * setting a new state fails. This default state could be all off.
1356          */
1357
1358         if (kbd_set_state(old))
1359                 pr_err("Setting old previous keyboard state failed\n");
1360
1361         return ret;
1362 }
1363
1364 static int kbd_set_token_bit(u8 bit)
1365 {
1366         struct calling_interface_buffer buffer;
1367         struct calling_interface_token *token;
1368         int ret;
1369
1370         if (bit >= ARRAY_SIZE(kbd_tokens))
1371                 return -EINVAL;
1372
1373         token = dell_smbios_find_token(kbd_tokens[bit]);
1374         if (!token)
1375                 return -EINVAL;
1376
1377         dell_fill_request(&buffer, token->location, token->value, 0, 0);
1378         ret = dell_send_request(&buffer, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
1379
1380         return ret;
1381 }
1382
1383 static int kbd_get_token_bit(u8 bit)
1384 {
1385         struct calling_interface_buffer buffer;
1386         struct calling_interface_token *token;
1387         int ret;
1388         int val;
1389
1390         if (bit >= ARRAY_SIZE(kbd_tokens))
1391                 return -EINVAL;
1392
1393         token = dell_smbios_find_token(kbd_tokens[bit]);
1394         if (!token)
1395                 return -EINVAL;
1396
1397         dell_fill_request(&buffer, token->location, 0, 0, 0);
1398         ret = dell_send_request(&buffer, CLASS_TOKEN_READ, SELECT_TOKEN_STD);
1399         val = buffer.output[1];
1400
1401         if (ret)
1402                 return ret;
1403
1404         return (val == token->value);
1405 }
1406
1407 static int kbd_get_first_active_token_bit(void)
1408 {
1409         int i;
1410         int ret;
1411
1412         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i) {
1413                 ret = kbd_get_token_bit(i);
1414                 if (ret == 1)
1415                         return i;
1416         }
1417
1418         return ret;
1419 }
1420
1421 static int kbd_get_valid_token_counts(void)
1422 {
1423         return hweight16(kbd_token_bits);
1424 }
1425
1426 static inline int kbd_init_info(void)
1427 {
1428         struct kbd_state state;
1429         int ret;
1430         int i;
1431
1432         ret = kbd_get_info(&kbd_info);
1433         if (ret)
1434                 return ret;
1435
1436         /* NOTE: Old models without KBD_LED_AC_TOKEN token supports only one
1437          *       timeout value which is shared for both battery and AC power
1438          *       settings. So do not try to set AC values on old models.
1439          */
1440         if ((quirks && quirks->kbd_missing_ac_tag) ||
1441             dell_smbios_find_token(KBD_LED_AC_TOKEN))
1442                 kbd_timeout_ac_supported = true;
1443
1444         kbd_get_state(&state);
1445
1446         /* NOTE: timeout value is stored in 6 bits so max value is 63 */
1447         if (kbd_info.seconds > 63)
1448                 kbd_info.seconds = 63;
1449         if (kbd_info.minutes > 63)
1450                 kbd_info.minutes = 63;
1451         if (kbd_info.hours > 63)
1452                 kbd_info.hours = 63;
1453         if (kbd_info.days > 63)
1454                 kbd_info.days = 63;
1455
1456         /* NOTE: On tested machines ON mode did not work and caused
1457          *       problems (turned backlight off) so do not use it
1458          */
1459         kbd_info.modes &= ~BIT(KBD_MODE_BIT_ON);
1460
1461         kbd_previous_level = kbd_get_level(&state);
1462         kbd_previous_mode_bit = state.mode_bit;
1463
1464         if (kbd_previous_level == 0 && kbd_get_max_level() != 0)
1465                 kbd_previous_level = 1;
1466
1467         if (kbd_previous_mode_bit == KBD_MODE_BIT_OFF) {
1468                 kbd_previous_mode_bit =
1469                         ffs(kbd_info.modes & ~BIT(KBD_MODE_BIT_OFF));
1470                 if (kbd_previous_mode_bit != 0)
1471                         kbd_previous_mode_bit--;
1472         }
1473
1474         if (kbd_info.modes & (BIT(KBD_MODE_BIT_ALS) |
1475                               BIT(KBD_MODE_BIT_TRIGGER_ALS)))
1476                 kbd_als_supported = true;
1477
1478         if (kbd_info.modes & (
1479             BIT(KBD_MODE_BIT_TRIGGER_ALS) | BIT(KBD_MODE_BIT_TRIGGER) |
1480             BIT(KBD_MODE_BIT_TRIGGER_25) | BIT(KBD_MODE_BIT_TRIGGER_50) |
1481             BIT(KBD_MODE_BIT_TRIGGER_75) | BIT(KBD_MODE_BIT_TRIGGER_100)
1482            ))
1483                 kbd_triggers_supported = true;
1484
1485         /* kbd_mode_levels[0] is reserved, see below */
1486         for (i = 0; i < 16; ++i)
1487                 if (kbd_is_level_mode_bit(i) && (BIT(i) & kbd_info.modes))
1488                         kbd_mode_levels[1 + kbd_mode_levels_count++] = i;
1489
1490         /*
1491          * Find the first supported mode and assign to kbd_mode_levels[0].
1492          * This should be 0 (off), but we cannot depend on the BIOS to
1493          * support 0.
1494          */
1495         if (kbd_mode_levels_count > 0) {
1496                 for (i = 0; i < 16; ++i) {
1497                         if (BIT(i) & kbd_info.modes) {
1498                                 kbd_mode_levels[0] = i;
1499                                 break;
1500                         }
1501                 }
1502                 kbd_mode_levels_count++;
1503         }
1504
1505         return 0;
1506
1507 }
1508
1509 static inline void kbd_init_tokens(void)
1510 {
1511         int i;
1512
1513         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i)
1514                 if (dell_smbios_find_token(kbd_tokens[i]))
1515                         kbd_token_bits |= BIT(i);
1516 }
1517
1518 static void kbd_init(void)
1519 {
1520         int ret;
1521
1522         if (quirks && quirks->kbd_led_not_present)
1523                 return;
1524
1525         ret = kbd_init_info();
1526         kbd_init_tokens();
1527
1528         /*
1529          * Only supports keyboard backlight when it has at least two modes.
1530          */
1531         if ((ret == 0 && (kbd_info.levels != 0 || kbd_mode_levels_count >= 2))
1532             || kbd_get_valid_token_counts() >= 2)
1533                 kbd_led_present = true;
1534 }
1535
1536 static ssize_t kbd_led_timeout_store(struct device *dev,
1537                                      struct device_attribute *attr,
1538                                      const char *buf, size_t count)
1539 {
1540         struct kbd_state new_state;
1541         struct kbd_state state;
1542         bool convert;
1543         int value;
1544         int ret;
1545         char ch;
1546         u8 unit;
1547         int i;
1548
1549         ret = sscanf(buf, "%d %c", &value, &ch);
1550         if (ret < 1)
1551                 return -EINVAL;
1552         else if (ret == 1)
1553                 ch = 's';
1554
1555         if (value < 0)
1556                 return -EINVAL;
1557
1558         convert = false;
1559
1560         switch (ch) {
1561         case 's':
1562                 if (value > kbd_info.seconds)
1563                         convert = true;
1564                 unit = KBD_TIMEOUT_SECONDS;
1565                 break;
1566         case 'm':
1567                 if (value > kbd_info.minutes)
1568                         convert = true;
1569                 unit = KBD_TIMEOUT_MINUTES;
1570                 break;
1571         case 'h':
1572                 if (value > kbd_info.hours)
1573                         convert = true;
1574                 unit = KBD_TIMEOUT_HOURS;
1575                 break;
1576         case 'd':
1577                 if (value > kbd_info.days)
1578                         convert = true;
1579                 unit = KBD_TIMEOUT_DAYS;
1580                 break;
1581         default:
1582                 return -EINVAL;
1583         }
1584
1585         if (quirks && quirks->needs_kbd_timeouts)
1586                 convert = true;
1587
1588         if (convert) {
1589                 /* Convert value from current units to seconds */
1590                 switch (unit) {
1591                 case KBD_TIMEOUT_DAYS:
1592                         value *= 24;
1593                         fallthrough;
1594                 case KBD_TIMEOUT_HOURS:
1595                         value *= 60;
1596                         fallthrough;
1597                 case KBD_TIMEOUT_MINUTES:
1598                         value *= 60;
1599                         unit = KBD_TIMEOUT_SECONDS;
1600                 }
1601
1602                 if (quirks && quirks->needs_kbd_timeouts) {
1603                         for (i = 0; quirks->kbd_timeouts[i] != -1; i++) {
1604                                 if (value <= quirks->kbd_timeouts[i]) {
1605                                         value = quirks->kbd_timeouts[i];
1606                                         break;
1607                                 }
1608                         }
1609                 }
1610
1611                 if (value <= kbd_info.seconds && kbd_info.seconds) {
1612                         unit = KBD_TIMEOUT_SECONDS;
1613                 } else if (value / 60 <= kbd_info.minutes && kbd_info.minutes) {
1614                         value /= 60;
1615                         unit = KBD_TIMEOUT_MINUTES;
1616                 } else if (value / (60 * 60) <= kbd_info.hours && kbd_info.hours) {
1617                         value /= (60 * 60);
1618                         unit = KBD_TIMEOUT_HOURS;
1619                 } else if (value / (60 * 60 * 24) <= kbd_info.days && kbd_info.days) {
1620                         value /= (60 * 60 * 24);
1621                         unit = KBD_TIMEOUT_DAYS;
1622                 } else {
1623                         return -EINVAL;
1624                 }
1625         }
1626
1627         mutex_lock(&kbd_led_mutex);
1628
1629         ret = kbd_get_state(&state);
1630         if (ret)
1631                 goto out;
1632
1633         new_state = state;
1634
1635         if (kbd_timeout_ac_supported && power_supply_is_system_supplied() > 0) {
1636                 new_state.timeout_value_ac = value;
1637                 new_state.timeout_unit_ac = unit;
1638         } else {
1639                 new_state.timeout_value = value;
1640                 new_state.timeout_unit = unit;
1641         }
1642
1643         ret = kbd_set_state_safe(&new_state, &state);
1644         if (ret)
1645                 goto out;
1646
1647         ret = count;
1648 out:
1649         mutex_unlock(&kbd_led_mutex);
1650         return ret;
1651 }
1652
1653 static ssize_t kbd_led_timeout_show(struct device *dev,
1654                                     struct device_attribute *attr, char *buf)
1655 {
1656         struct kbd_state state;
1657         int value;
1658         int ret;
1659         int len;
1660         u8 unit;
1661
1662         ret = kbd_get_state(&state);
1663         if (ret)
1664                 return ret;
1665
1666         if (kbd_timeout_ac_supported && power_supply_is_system_supplied() > 0) {
1667                 value = state.timeout_value_ac;
1668                 unit = state.timeout_unit_ac;
1669         } else {
1670                 value = state.timeout_value;
1671                 unit = state.timeout_unit;
1672         }
1673
1674         len = sprintf(buf, "%d", value);
1675
1676         switch (unit) {
1677         case KBD_TIMEOUT_SECONDS:
1678                 return len + sprintf(buf+len, "s\n");
1679         case KBD_TIMEOUT_MINUTES:
1680                 return len + sprintf(buf+len, "m\n");
1681         case KBD_TIMEOUT_HOURS:
1682                 return len + sprintf(buf+len, "h\n");
1683         case KBD_TIMEOUT_DAYS:
1684                 return len + sprintf(buf+len, "d\n");
1685         default:
1686                 return -EINVAL;
1687         }
1688
1689         return len;
1690 }
1691
1692 static DEVICE_ATTR(stop_timeout, S_IRUGO | S_IWUSR,
1693                    kbd_led_timeout_show, kbd_led_timeout_store);
1694
1695 static const char * const kbd_led_triggers[] = {
1696         "keyboard",
1697         "touchpad",
1698         /*"trackstick"*/ NULL, /* NOTE: trackstick is just alias for touchpad */
1699         "mouse",
1700 };
1701
1702 static ssize_t kbd_led_triggers_store(struct device *dev,
1703                                       struct device_attribute *attr,
1704                                       const char *buf, size_t count)
1705 {
1706         struct kbd_state new_state;
1707         struct kbd_state state;
1708         bool triggers_enabled = false;
1709         int trigger_bit = -1;
1710         char trigger[21];
1711         int i, ret;
1712
1713         ret = sscanf(buf, "%20s", trigger);
1714         if (ret != 1)
1715                 return -EINVAL;
1716
1717         if (trigger[0] != '+' && trigger[0] != '-')
1718                 return -EINVAL;
1719
1720         mutex_lock(&kbd_led_mutex);
1721
1722         ret = kbd_get_state(&state);
1723         if (ret)
1724                 goto out;
1725
1726         if (kbd_triggers_supported)
1727                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1728
1729         if (kbd_triggers_supported) {
1730                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1731                         if (!(kbd_info.triggers & BIT(i)))
1732                                 continue;
1733                         if (!kbd_led_triggers[i])
1734                                 continue;
1735                         if (strcmp(trigger+1, kbd_led_triggers[i]) != 0)
1736                                 continue;
1737                         if (trigger[0] == '+' &&
1738                             triggers_enabled && (state.triggers & BIT(i))) {
1739                                 ret = count;
1740                                 goto out;
1741                         }
1742                         if (trigger[0] == '-' &&
1743                             (!triggers_enabled || !(state.triggers & BIT(i)))) {
1744                                 ret = count;
1745                                 goto out;
1746                         }
1747                         trigger_bit = i;
1748                         break;
1749                 }
1750         }
1751
1752         if (trigger_bit == -1) {
1753                 ret = -EINVAL;
1754                 goto out;
1755         }
1756
1757         new_state = state;
1758         if (trigger[0] == '+')
1759                 new_state.triggers |= BIT(trigger_bit);
1760         else {
1761                 new_state.triggers &= ~BIT(trigger_bit);
1762                 /*
1763                  * NOTE: trackstick bit (2) must be disabled when
1764                  *       disabling touchpad bit (1), otherwise touchpad
1765                  *       bit (1) will not be disabled
1766                  */
1767                 if (trigger_bit == 1)
1768                         new_state.triggers &= ~BIT(2);
1769         }
1770         if ((kbd_info.triggers & new_state.triggers) !=
1771             new_state.triggers) {
1772                 ret = -EINVAL;
1773                 goto out;
1774         }
1775         if (new_state.triggers && !triggers_enabled) {
1776                 new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1777                 kbd_set_level(&new_state, kbd_previous_level);
1778         } else if (new_state.triggers == 0) {
1779                 kbd_set_level(&new_state, 0);
1780         }
1781         if (!(kbd_info.modes & BIT(new_state.mode_bit))) {
1782                 ret = -EINVAL;
1783                 goto out;
1784         }
1785         ret = kbd_set_state_safe(&new_state, &state);
1786         if (ret)
1787                 goto out;
1788         if (new_state.mode_bit != KBD_MODE_BIT_OFF)
1789                 kbd_previous_mode_bit = new_state.mode_bit;
1790         ret = count;
1791 out:
1792         mutex_unlock(&kbd_led_mutex);
1793         return ret;
1794 }
1795
1796 static ssize_t kbd_led_triggers_show(struct device *dev,
1797                                      struct device_attribute *attr, char *buf)
1798 {
1799         struct kbd_state state;
1800         bool triggers_enabled;
1801         int level, i, ret;
1802         int len = 0;
1803
1804         ret = kbd_get_state(&state);
1805         if (ret)
1806                 return ret;
1807
1808         len = 0;
1809
1810         if (kbd_triggers_supported) {
1811                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1812                 level = kbd_get_level(&state);
1813                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1814                         if (!(kbd_info.triggers & BIT(i)))
1815                                 continue;
1816                         if (!kbd_led_triggers[i])
1817                                 continue;
1818                         if ((triggers_enabled || level <= 0) &&
1819                             (state.triggers & BIT(i)))
1820                                 buf[len++] = '+';
1821                         else
1822                                 buf[len++] = '-';
1823                         len += sprintf(buf+len, "%s ", kbd_led_triggers[i]);
1824                 }
1825         }
1826
1827         if (len)
1828                 buf[len - 1] = '\n';
1829
1830         return len;
1831 }
1832
1833 static DEVICE_ATTR(start_triggers, S_IRUGO | S_IWUSR,
1834                    kbd_led_triggers_show, kbd_led_triggers_store);
1835
1836 static ssize_t kbd_led_als_enabled_store(struct device *dev,
1837                                          struct device_attribute *attr,
1838                                          const char *buf, size_t count)
1839 {
1840         struct kbd_state new_state;
1841         struct kbd_state state;
1842         bool triggers_enabled = false;
1843         int enable;
1844         int ret;
1845
1846         ret = kstrtoint(buf, 0, &enable);
1847         if (ret)
1848                 return ret;
1849
1850         mutex_lock(&kbd_led_mutex);
1851
1852         ret = kbd_get_state(&state);
1853         if (ret)
1854                 goto out;
1855
1856         if (enable == kbd_is_als_mode_bit(state.mode_bit)) {
1857                 ret = count;
1858                 goto out;
1859         }
1860
1861         new_state = state;
1862
1863         if (kbd_triggers_supported)
1864                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1865
1866         if (enable) {
1867                 if (triggers_enabled)
1868                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER_ALS;
1869                 else
1870                         new_state.mode_bit = KBD_MODE_BIT_ALS;
1871         } else {
1872                 if (triggers_enabled) {
1873                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1874                         kbd_set_level(&new_state, kbd_previous_level);
1875                 } else {
1876                         new_state.mode_bit = KBD_MODE_BIT_ON;
1877                 }
1878         }
1879         if (!(kbd_info.modes & BIT(new_state.mode_bit)))  {
1880                 ret = -EINVAL;
1881                 goto out;
1882         }
1883
1884         ret = kbd_set_state_safe(&new_state, &state);
1885         if (ret)
1886                 goto out;
1887         kbd_previous_mode_bit = new_state.mode_bit;
1888
1889         ret = count;
1890 out:
1891         mutex_unlock(&kbd_led_mutex);
1892         return ret;
1893 }
1894
1895 static ssize_t kbd_led_als_enabled_show(struct device *dev,
1896                                         struct device_attribute *attr,
1897                                         char *buf)
1898 {
1899         struct kbd_state state;
1900         bool enabled = false;
1901         int ret;
1902
1903         ret = kbd_get_state(&state);
1904         if (ret)
1905                 return ret;
1906         enabled = kbd_is_als_mode_bit(state.mode_bit);
1907
1908         return sprintf(buf, "%d\n", enabled ? 1 : 0);
1909 }
1910
1911 static DEVICE_ATTR(als_enabled, S_IRUGO | S_IWUSR,
1912                    kbd_led_als_enabled_show, kbd_led_als_enabled_store);
1913
1914 static ssize_t kbd_led_als_setting_store(struct device *dev,
1915                                          struct device_attribute *attr,
1916                                          const char *buf, size_t count)
1917 {
1918         struct kbd_state state;
1919         struct kbd_state new_state;
1920         u8 setting;
1921         int ret;
1922
1923         ret = kstrtou8(buf, 10, &setting);
1924         if (ret)
1925                 return ret;
1926
1927         mutex_lock(&kbd_led_mutex);
1928
1929         ret = kbd_get_state(&state);
1930         if (ret)
1931                 goto out;
1932
1933         new_state = state;
1934         new_state.als_setting = setting;
1935
1936         ret = kbd_set_state_safe(&new_state, &state);
1937         if (ret)
1938                 goto out;
1939
1940         ret = count;
1941 out:
1942         mutex_unlock(&kbd_led_mutex);
1943         return ret;
1944 }
1945
1946 static ssize_t kbd_led_als_setting_show(struct device *dev,
1947                                         struct device_attribute *attr,
1948                                         char *buf)
1949 {
1950         struct kbd_state state;
1951         int ret;
1952
1953         ret = kbd_get_state(&state);
1954         if (ret)
1955                 return ret;
1956
1957         return sprintf(buf, "%d\n", state.als_setting);
1958 }
1959
1960 static DEVICE_ATTR(als_setting, S_IRUGO | S_IWUSR,
1961                    kbd_led_als_setting_show, kbd_led_als_setting_store);
1962
1963 static struct attribute *kbd_led_attrs[] = {
1964         &dev_attr_stop_timeout.attr,
1965         &dev_attr_start_triggers.attr,
1966         NULL,
1967 };
1968
1969 static const struct attribute_group kbd_led_group = {
1970         .attrs = kbd_led_attrs,
1971 };
1972
1973 static struct attribute *kbd_led_als_attrs[] = {
1974         &dev_attr_als_enabled.attr,
1975         &dev_attr_als_setting.attr,
1976         NULL,
1977 };
1978
1979 static const struct attribute_group kbd_led_als_group = {
1980         .attrs = kbd_led_als_attrs,
1981 };
1982
1983 static const struct attribute_group *kbd_led_groups[] = {
1984         &kbd_led_group,
1985         &kbd_led_als_group,
1986         NULL,
1987 };
1988
1989 static enum led_brightness kbd_led_level_get(struct led_classdev *led_cdev)
1990 {
1991         int ret;
1992         u16 num;
1993         struct kbd_state state;
1994
1995         if (kbd_get_max_level()) {
1996                 ret = kbd_get_state(&state);
1997                 if (ret)
1998                         return 0;
1999                 ret = kbd_get_level(&state);
2000                 if (ret < 0)
2001                         return 0;
2002                 return ret;
2003         }
2004
2005         if (kbd_get_valid_token_counts()) {
2006                 ret = kbd_get_first_active_token_bit();
2007                 if (ret < 0)
2008                         return 0;
2009                 for (num = kbd_token_bits; num != 0 && ret > 0; --ret)
2010                         num &= num - 1; /* clear the first bit set */
2011                 if (num == 0)
2012                         return 0;
2013                 return ffs(num) - 1;
2014         }
2015
2016         pr_warn("Keyboard brightness level control not supported\n");
2017         return 0;
2018 }
2019
2020 static int kbd_led_level_set(struct led_classdev *led_cdev,
2021                              enum led_brightness value)
2022 {
2023         enum led_brightness new_value = value;
2024         struct kbd_state state;
2025         struct kbd_state new_state;
2026         u16 num;
2027         int ret;
2028
2029         mutex_lock(&kbd_led_mutex);
2030
2031         if (kbd_get_max_level()) {
2032                 ret = kbd_get_state(&state);
2033                 if (ret)
2034                         goto out;
2035                 new_state = state;
2036                 ret = kbd_set_level(&new_state, value);
2037                 if (ret)
2038                         goto out;
2039                 ret = kbd_set_state_safe(&new_state, &state);
2040         } else if (kbd_get_valid_token_counts()) {
2041                 for (num = kbd_token_bits; num != 0 && value > 0; --value)
2042                         num &= num - 1; /* clear the first bit set */
2043                 if (num == 0)
2044                         ret = 0;
2045                 else
2046                         ret = kbd_set_token_bit(ffs(num) - 1);
2047         } else {
2048                 pr_warn("Keyboard brightness level control not supported\n");
2049                 ret = -ENXIO;
2050         }
2051
2052 out:
2053         if (ret == 0)
2054                 kbd_led_level = new_value;
2055
2056         mutex_unlock(&kbd_led_mutex);
2057         return ret;
2058 }
2059
2060 static struct led_classdev kbd_led = {
2061         .name           = "dell::kbd_backlight",
2062         .flags          = LED_BRIGHT_HW_CHANGED,
2063         .brightness_set_blocking = kbd_led_level_set,
2064         .brightness_get = kbd_led_level_get,
2065         .groups         = kbd_led_groups,
2066 };
2067
2068 static int __init kbd_led_init(struct device *dev)
2069 {
2070         int ret;
2071
2072         kbd_init();
2073         if (!kbd_led_present)
2074                 return -ENODEV;
2075         if (!kbd_als_supported)
2076                 kbd_led_groups[1] = NULL;
2077         kbd_led.max_brightness = kbd_get_max_level();
2078         if (!kbd_led.max_brightness) {
2079                 kbd_led.max_brightness = kbd_get_valid_token_counts();
2080                 if (kbd_led.max_brightness)
2081                         kbd_led.max_brightness--;
2082         }
2083
2084         kbd_led_level = kbd_led_level_get(NULL);
2085
2086         ret = led_classdev_register(dev, &kbd_led);
2087         if (ret)
2088                 kbd_led_present = false;
2089
2090         return ret;
2091 }
2092
2093 static void brightness_set_exit(struct led_classdev *led_cdev,
2094                                 enum led_brightness value)
2095 {
2096         /* Don't change backlight level on exit */
2097 };
2098
2099 static void kbd_led_exit(void)
2100 {
2101         if (!kbd_led_present)
2102                 return;
2103         kbd_led.brightness_set = brightness_set_exit;
2104         led_classdev_unregister(&kbd_led);
2105 }
2106
2107 static int dell_laptop_notifier_call(struct notifier_block *nb,
2108                                      unsigned long action, void *data)
2109 {
2110         bool changed = false;
2111         enum led_brightness new_kbd_led_level;
2112
2113         switch (action) {
2114         case DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED:
2115                 if (!kbd_led_present)
2116                         break;
2117
2118                 mutex_lock(&kbd_led_mutex);
2119                 new_kbd_led_level = kbd_led_level_get(&kbd_led);
2120                 if (kbd_led_level != new_kbd_led_level) {
2121                         kbd_led_level = new_kbd_led_level;
2122                         changed = true;
2123                 }
2124                 mutex_unlock(&kbd_led_mutex);
2125
2126                 if (changed)
2127                         led_classdev_notify_brightness_hw_changed(&kbd_led,
2128                                                                 kbd_led_level);
2129                 break;
2130         }
2131
2132         return NOTIFY_OK;
2133 }
2134
2135 static struct notifier_block dell_laptop_notifier = {
2136         .notifier_call = dell_laptop_notifier_call,
2137 };
2138
2139 static int micmute_led_set(struct led_classdev *led_cdev,
2140                            enum led_brightness brightness)
2141 {
2142         struct calling_interface_buffer buffer;
2143         struct calling_interface_token *token;
2144         int state = brightness != LED_OFF;
2145
2146         if (state == 0)
2147                 token = dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE);
2148         else
2149                 token = dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE);
2150
2151         if (!token)
2152                 return -ENODEV;
2153
2154         dell_fill_request(&buffer, token->location, token->value, 0, 0);
2155         dell_send_request(&buffer, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
2156
2157         return 0;
2158 }
2159
2160 static struct led_classdev micmute_led_cdev = {
2161         .name = "platform::micmute",
2162         .max_brightness = 1,
2163         .brightness_set_blocking = micmute_led_set,
2164         .default_trigger = "audio-micmute",
2165 };
2166
2167 static int __init dell_init(void)
2168 {
2169         struct calling_interface_token *token;
2170         int max_intensity = 0;
2171         int ret;
2172
2173         if (!dmi_check_system(dell_device_table))
2174                 return -ENODEV;
2175
2176         quirks = NULL;
2177         /* find if this machine support other functions */
2178         dmi_check_system(dell_quirks);
2179
2180         ret = platform_driver_register(&platform_driver);
2181         if (ret)
2182                 goto fail_platform_driver;
2183         platform_device = platform_device_alloc("dell-laptop", -1);
2184         if (!platform_device) {
2185                 ret = -ENOMEM;
2186                 goto fail_platform_device1;
2187         }
2188         ret = platform_device_add(platform_device);
2189         if (ret)
2190                 goto fail_platform_device2;
2191
2192         ret = dell_setup_rfkill();
2193
2194         if (ret) {
2195                 pr_warn("Unable to setup rfkill\n");
2196                 goto fail_rfkill;
2197         }
2198
2199         if (quirks && quirks->touchpad_led)
2200                 touchpad_led_init(&platform_device->dev);
2201
2202         kbd_led_init(&platform_device->dev);
2203
2204         dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
2205         debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
2206                             &dell_debugfs_fops);
2207
2208         dell_laptop_register_notifier(&dell_laptop_notifier);
2209
2210         if (dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE) &&
2211             dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE) &&
2212             !dell_privacy_has_mic_mute()) {
2213                 micmute_led_cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
2214                 ret = led_classdev_register(&platform_device->dev, &micmute_led_cdev);
2215                 if (ret < 0)
2216                         goto fail_led;
2217                 micmute_led_registered = true;
2218         }
2219
2220         if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
2221                 return 0;
2222
2223         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
2224         if (token) {
2225                 struct calling_interface_buffer buffer;
2226
2227                 dell_fill_request(&buffer, token->location, 0, 0, 0);
2228                 ret = dell_send_request(&buffer,
2229                                         CLASS_TOKEN_READ, SELECT_TOKEN_AC);
2230                 if (ret == 0)
2231                         max_intensity = buffer.output[3];
2232         }
2233
2234         if (max_intensity) {
2235                 struct backlight_properties props;
2236                 memset(&props, 0, sizeof(struct backlight_properties));
2237                 props.type = BACKLIGHT_PLATFORM;
2238                 props.max_brightness = max_intensity;
2239                 dell_backlight_device = backlight_device_register("dell_backlight",
2240                                                                   &platform_device->dev,
2241                                                                   NULL,
2242                                                                   &dell_ops,
2243                                                                   &props);
2244
2245                 if (IS_ERR(dell_backlight_device)) {
2246                         ret = PTR_ERR(dell_backlight_device);
2247                         dell_backlight_device = NULL;
2248                         goto fail_backlight;
2249                 }
2250
2251                 dell_backlight_device->props.brightness =
2252                         dell_get_intensity(dell_backlight_device);
2253                 if (dell_backlight_device->props.brightness < 0) {
2254                         ret = dell_backlight_device->props.brightness;
2255                         goto fail_get_brightness;
2256                 }
2257                 backlight_update_status(dell_backlight_device);
2258         }
2259
2260         return 0;
2261
2262 fail_get_brightness:
2263         backlight_device_unregister(dell_backlight_device);
2264 fail_backlight:
2265         if (micmute_led_registered)
2266                 led_classdev_unregister(&micmute_led_cdev);
2267 fail_led:
2268         dell_cleanup_rfkill();
2269 fail_rfkill:
2270         platform_device_del(platform_device);
2271 fail_platform_device2:
2272         platform_device_put(platform_device);
2273 fail_platform_device1:
2274         platform_driver_unregister(&platform_driver);
2275 fail_platform_driver:
2276         return ret;
2277 }
2278
2279 static void __exit dell_exit(void)
2280 {
2281         dell_laptop_unregister_notifier(&dell_laptop_notifier);
2282         debugfs_remove_recursive(dell_laptop_dir);
2283         if (quirks && quirks->touchpad_led)
2284                 touchpad_led_exit();
2285         kbd_led_exit();
2286         backlight_device_unregister(dell_backlight_device);
2287         if (micmute_led_registered)
2288                 led_classdev_unregister(&micmute_led_cdev);
2289         dell_cleanup_rfkill();
2290         if (platform_device) {
2291                 platform_device_unregister(platform_device);
2292                 platform_driver_unregister(&platform_driver);
2293         }
2294 }
2295
2296 /* dell-rbtn.c driver export functions which will not work correctly (and could
2297  * cause kernel crash) if they are called before dell-rbtn.c init code. This is
2298  * not problem when dell-rbtn.c is compiled as external module. When both files
2299  * (dell-rbtn.c and dell-laptop.c) are compiled statically into kernel, then we
2300  * need to ensure that dell_init() will be called after initializing dell-rbtn.
2301  * This can be achieved by late_initcall() instead module_init().
2302  */
2303 late_initcall(dell_init);
2304 module_exit(dell_exit);
2305
2306 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
2307 MODULE_AUTHOR("Gabriele Mazzotta <gabriele.mzt@gmail.com>");
2308 MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");
2309 MODULE_DESCRIPTION("Dell laptop driver");
2310 MODULE_LICENSE("GPL");