drivers/platform/x86/dell-laptop.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Driver for Dell laptop extras
   4  *
   5  *  Copyright (c) Red Hat <mjg@redhat.com>
   6  *  Copyright (c) 2014 Gabriele Mazzotta <gabriele.mzt@gmail.com>
   7  *  Copyright (c) 2014 Pali Rohár <pali@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 struct quirk_entry {
  35         bool touchpad_led;
  36         bool kbd_led_not_present;
  37         bool kbd_led_levels_off_1;
  38         bool kbd_missing_ac_tag;
  39
  40         bool needs_kbd_timeouts;
  41         /*
  42          * Ordered list of timeouts expressed in seconds.
  43          * The list must end with -1
  44          */
  45         int kbd_timeouts[];
  46 };
  47
  48 static struct quirk_entry *quirks;
  49
  50 static struct quirk_entry quirk_dell_vostro_v130 = {
  51         .touchpad_led = true,
  52 };
  53
  54 static int __init dmi_matched(const struct dmi_system_id *dmi)
  55 {
  56         quirks = dmi->driver_data;
  57         return 1;
  58 }
  59
  60 /*
  61  * These values come from Windows utility provided by Dell. If any other value
  62  * is used then BIOS silently set timeout to 0 without any error message.
  63  */
  64 static struct quirk_entry quirk_dell_xps13_9333 = {
  65         .needs_kbd_timeouts = true,
  66         .kbd_timeouts = { 0, 5, 15, 60, 5 * 60, 15 * 60, -1 },
  67 };
  68
  69 static struct quirk_entry quirk_dell_xps13_9370 = {
  70         .kbd_missing_ac_tag = true,
  71 };
  72
  73 static struct quirk_entry quirk_dell_latitude_e6410 = {
  74         .kbd_led_levels_off_1 = true,
  75 };
  76
  77 static struct quirk_entry quirk_dell_inspiron_1012 = {
  78         .kbd_led_not_present = true,
  79 };
  80
  81 static struct platform_driver platform_driver = {
  82         .driver = {
  83                 .name = "dell-laptop",
  84         }
  85 };
  86
  87 static struct platform_device *platform_device;
  88 static struct backlight_device *dell_backlight_device;
  89 static struct rfkill *wifi_rfkill;
  90 static struct rfkill *bluetooth_rfkill;
  91 static struct rfkill *wwan_rfkill;
  92 static bool force_rfkill;
  93
  94 module_param(force_rfkill, bool, 0444);
  95 MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
  96
  97 static const struct dmi_system_id dell_device_table[] __initconst = {
  98         {
  99                 .ident = "Dell laptop",
 100                 .matches = {
 101                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 102                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 103                 },
 104         },
 105         {
 106                 .matches = {
 107                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 108                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
 109                 },
 110         },
 111         {
 112                 .matches = {
 113                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 114                         DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /*Notebook*/
 115                 },
 116         },
 117         {
 118                 .matches = {
 119                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 120                         DMI_MATCH(DMI_CHASSIS_TYPE, "30"), /*Tablet*/
 121                 },
 122         },
 123         {
 124                 .matches = {
 125                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 126                         DMI_MATCH(DMI_CHASSIS_TYPE, "31"), /*Convertible*/
 127                 },
 128         },
 129         {
 130                 .matches = {
 131                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 132                         DMI_MATCH(DMI_CHASSIS_TYPE, "32"), /*Detachable*/
 133                 },
 134         },
 135         {
 136                 .ident = "Dell Computer Corporation",
 137                 .matches = {
 138                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 139                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 140                 },
 141         },
 142         { }
 143 };
 144 MODULE_DEVICE_TABLE(dmi, dell_device_table);
 145
 146 static const struct dmi_system_id dell_quirks[] __initconst = {
 147         {
 148                 .callback = dmi_matched,
 149                 .ident = "Dell Vostro V130",
 150                 .matches = {
 151                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 152                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
 153                 },
 154                 .driver_data = &quirk_dell_vostro_v130,
 155         },
 156         {
 157                 .callback = dmi_matched,
 158                 .ident = "Dell Vostro V131",
 159                 .matches = {
 160                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 161                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 162                 },
 163                 .driver_data = &quirk_dell_vostro_v130,
 164         },
 165         {
 166                 .callback = dmi_matched,
 167                 .ident = "Dell Vostro 3350",
 168                 .matches = {
 169                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 170                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
 171                 },
 172                 .driver_data = &quirk_dell_vostro_v130,
 173         },
 174         {
 175                 .callback = dmi_matched,
 176                 .ident = "Dell Vostro 3555",
 177                 .matches = {
 178                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 179                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
 180                 },
 181                 .driver_data = &quirk_dell_vostro_v130,
 182         },
 183         {
 184                 .callback = dmi_matched,
 185                 .ident = "Dell Inspiron N311z",
 186                 .matches = {
 187                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 188                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
 189                 },
 190                 .driver_data = &quirk_dell_vostro_v130,
 191         },
 192         {
 193                 .callback = dmi_matched,
 194                 .ident = "Dell Inspiron M5110",
 195                 .matches = {
 196                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 197                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
 198                 },
 199                 .driver_data = &quirk_dell_vostro_v130,
 200         },
 201         {
 202                 .callback = dmi_matched,
 203                 .ident = "Dell Vostro 3360",
 204                 .matches = {
 205                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 206                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
 207                 },
 208                 .driver_data = &quirk_dell_vostro_v130,
 209         },
 210         {
 211                 .callback = dmi_matched,
 212                 .ident = "Dell Vostro 3460",
 213                 .matches = {
 214                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 215                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"),
 216                 },
 217                 .driver_data = &quirk_dell_vostro_v130,
 218         },
 219         {
 220                 .callback = dmi_matched,
 221                 .ident = "Dell Vostro 3560",
 222                 .matches = {
 223                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 224                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"),
 225                 },
 226                 .driver_data = &quirk_dell_vostro_v130,
 227         },
 228         {
 229                 .callback = dmi_matched,
 230                 .ident = "Dell Vostro 3450",
 231                 .matches = {
 232                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 233                         DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"),
 234                 },
 235                 .driver_data = &quirk_dell_vostro_v130,
 236         },
 237         {
 238                 .callback = dmi_matched,
 239                 .ident = "Dell Inspiron 5420",
 240                 .matches = {
 241                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 242                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"),
 243                 },
 244                 .driver_data = &quirk_dell_vostro_v130,
 245         },
 246         {
 247                 .callback = dmi_matched,
 248                 .ident = "Dell Inspiron 5520",
 249                 .matches = {
 250                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 251                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"),
 252                 },
 253                 .driver_data = &quirk_dell_vostro_v130,
 254         },
 255         {
 256                 .callback = dmi_matched,
 257                 .ident = "Dell Inspiron 5720",
 258                 .matches = {
 259                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 260                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"),
 261                 },
 262                 .driver_data = &quirk_dell_vostro_v130,
 263         },
 264         {
 265                 .callback = dmi_matched,
 266                 .ident = "Dell Inspiron 7420",
 267                 .matches = {
 268                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 269                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"),
 270                 },
 271                 .driver_data = &quirk_dell_vostro_v130,
 272         },
 273         {
 274                 .callback = dmi_matched,
 275                 .ident = "Dell Inspiron 7520",
 276                 .matches = {
 277                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 278                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
 279                 },
 280                 .driver_data = &quirk_dell_vostro_v130,
 281         },
 282         {
 283                 .callback = dmi_matched,
 284                 .ident = "Dell Inspiron 7720",
 285                 .matches = {
 286                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 287                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
 288                 },
 289                 .driver_data = &quirk_dell_vostro_v130,
 290         },
 291         {
 292                 .callback = dmi_matched,
 293                 .ident = "Dell XPS13 9333",
 294                 .matches = {
 295                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 296                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
 297                 },
 298                 .driver_data = &quirk_dell_xps13_9333,
 299         },
 300         {
 301                 .callback = dmi_matched,
 302                 .ident = "Dell XPS 13 9370",
 303                 .matches = {
 304                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 305                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS 13 9370"),
 306                 },
 307                 .driver_data = &quirk_dell_xps13_9370,
 308         },
 309         {
 310                 .callback = dmi_matched,
 311                 .ident = "Dell Latitude E6410",
 312                 .matches = {
 313                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 314                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6410"),
 315                 },
 316                 .driver_data = &quirk_dell_latitude_e6410,
 317         },
 318         {
 319                 .callback = dmi_matched,
 320                 .ident = "Dell Inspiron 1012",
 321                 .matches = {
 322                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 323                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"),
 324                 },
 325                 .driver_data = &quirk_dell_inspiron_1012,
 326         },
 327         {
 328                 .callback = dmi_matched,
 329                 .ident = "Dell Inspiron 1018",
 330                 .matches = {
 331                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 332                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1018"),
 333                 },
 334                 .driver_data = &quirk_dell_inspiron_1012,
 335         },
 336         { }
 337 };
 338
 339 static void dell_fill_request(struct calling_interface_buffer *buffer,
 340                                u32 arg0, u32 arg1, u32 arg2, u32 arg3)
 341 {
 342         memset(buffer, 0, sizeof(struct calling_interface_buffer));
 343         buffer->input[0] = arg0;
 344         buffer->input[1] = arg1;
 345         buffer->input[2] = arg2;
 346         buffer->input[3] = arg3;
 347 }
 348
 349 static int dell_send_request(struct calling_interface_buffer *buffer,
 350                              u16 class, u16 select)
 351 {
 352         int ret;
 353
 354         buffer->cmd_class = class;
 355         buffer->cmd_select = select;
 356         ret = dell_smbios_call(buffer);
 357         if (ret != 0)
 358                 return ret;
 359         return dell_smbios_error(buffer->output[0]);
 360 }
 361
 362 /*
 363  * Derived from information in smbios-wireless-ctl:
 364  *
 365  * cbSelect 17, Value 11
 366  *
 367  * Return Wireless Info
 368  * cbArg1, byte0 = 0x00
 369  *
 370  *     cbRes1 Standard return codes (0, -1, -2)
 371  *     cbRes2 Info bit flags:
 372  *
 373  *     0 Hardware switch supported (1)
 374  *     1 WiFi locator supported (1)
 375  *     2 WLAN supported (1)
 376  *     3 Bluetooth (BT) supported (1)
 377  *     4 WWAN supported (1)
 378  *     5 Wireless KBD supported (1)
 379  *     6 Uw b supported (1)
 380  *     7 WiGig supported (1)
 381  *     8 WLAN installed (1)
 382  *     9 BT installed (1)
 383  *     10 WWAN installed (1)
 384  *     11 Uw b installed (1)
 385  *     12 WiGig installed (1)
 386  *     13-15 Reserved (0)
 387  *     16 Hardware (HW) switch is On (1)
 388  *     17 WLAN disabled (1)
 389  *     18 BT disabled (1)
 390  *     19 WWAN disabled (1)
 391  *     20 Uw b disabled (1)
 392  *     21 WiGig disabled (1)
 393  *     20-31 Reserved (0)
 394  *
 395  *     cbRes3 NVRAM size in bytes
 396  *     cbRes4, byte 0 NVRAM format version number
 397  *
 398  *
 399  * Set QuickSet Radio Disable Flag
 400  *     cbArg1, byte0 = 0x01
 401  *     cbArg1, byte1
 402  *     Radio ID     value:
 403  *     0        Radio Status
 404  *     1        WLAN ID
 405  *     2        BT ID
 406  *     3        WWAN ID
 407  *     4        UWB ID
 408  *     5        WIGIG ID
 409  *     cbArg1, byte2    Flag bits:
 410  *             0 QuickSet disables radio (1)
 411  *             1-7 Reserved (0)
 412  *
 413  *     cbRes1    Standard return codes (0, -1, -2)
 414  *     cbRes2    QuickSet (QS) radio disable bit map:
 415  *     0 QS disables WLAN
 416  *     1 QS disables BT
 417  *     2 QS disables WWAN
 418  *     3 QS disables UWB
 419  *     4 QS disables WIGIG
 420  *     5-31 Reserved (0)
 421  *
 422  * Wireless Switch Configuration
 423  *     cbArg1, byte0 = 0x02
 424  *
 425  *     cbArg1, byte1
 426  *     Subcommand:
 427  *     0 Get config
 428  *     1 Set config
 429  *     2 Set WiFi locator enable/disable
 430  *     cbArg1,byte2
 431  *     Switch settings (if byte 1==1):
 432  *     0 WLAN sw itch control (1)
 433  *     1 BT sw itch control (1)
 434  *     2 WWAN sw itch control (1)
 435  *     3 UWB sw itch control (1)
 436  *     4 WiGig sw itch control (1)
 437  *     5-7 Reserved (0)
 438  *    cbArg1, byte2 Enable bits (if byte 1==2):
 439  *     0 Enable WiFi locator (1)
 440  *
 441  *    cbRes1     Standard return codes (0, -1, -2)
 442  *    cbRes2 QuickSet radio disable bit map:
 443  *     0 WLAN controlled by sw itch (1)
 444  *     1 BT controlled by sw itch (1)
 445  *     2 WWAN controlled by sw itch (1)
 446  *     3 UWB controlled by sw itch (1)
 447  *     4 WiGig controlled by sw itch (1)
 448  *     5-6 Reserved (0)
 449  *     7 Wireless sw itch config locked (1)
 450  *     8 WiFi locator enabled (1)
 451  *     9-14 Reserved (0)
 452  *     15 WiFi locator setting locked (1)
 453  *     16-31 Reserved (0)
 454  *
 455  * Read Local Config Data (LCD)
 456  *     cbArg1, byte0 = 0x10
 457  *     cbArg1, byte1 NVRAM index low byte
 458  *     cbArg1, byte2 NVRAM index high byte
 459  *     cbRes1 Standard return codes (0, -1, -2)
 460  *     cbRes2 4 bytes read from LCD[index]
 461  *     cbRes3 4 bytes read from LCD[index+4]
 462  *     cbRes4 4 bytes read from LCD[index+8]
 463  *
 464  * Write Local Config Data (LCD)
 465  *     cbArg1, byte0 = 0x11
 466  *     cbArg1, byte1 NVRAM index low byte
 467  *     cbArg1, byte2 NVRAM index high byte
 468  *     cbArg2 4 bytes to w rite at LCD[index]
 469  *     cbArg3 4 bytes to w rite at LCD[index+4]
 470  *     cbArg4 4 bytes to w rite at LCD[index+8]
 471  *     cbRes1 Standard return codes (0, -1, -2)
 472  *
 473  * Populate Local Config Data from NVRAM
 474  *     cbArg1, byte0 = 0x12
 475  *     cbRes1 Standard return codes (0, -1, -2)
 476  *
 477  * Commit Local Config Data to NVRAM
 478  *     cbArg1, byte0 = 0x13
 479  *     cbRes1 Standard return codes (0, -1, -2)
 480  */
 481
 482 static int dell_rfkill_set(void *data, bool blocked)
 483 {
 484         int disable = blocked ? 1 : 0;
 485         unsigned long radio = (unsigned long)data;
 486         int hwswitch_bit = (unsigned long)data - 1;
 487         struct calling_interface_buffer buffer;
 488         int hwswitch;
 489         int status;
 490         int ret;
 491
 492         dell_fill_request(&buffer, 0, 0, 0, 0);
 493         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 494         if (ret)
 495                 return ret;
 496         status = buffer.output[1];
 497
 498         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 499         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 500         if (ret)
 501                 return ret;
 502         hwswitch = buffer.output[1];
 503
 504         /* If the hardware switch controls this radio, and the hardware
 505            switch is disabled, always disable the radio */
 506         if (ret == 0 && (hwswitch & BIT(hwswitch_bit)) &&
 507             (status & BIT(0)) && !(status & BIT(16)))
 508                 disable = 1;
 509
 510         dell_fill_request(&buffer, 1 | (radio<<8) | (disable << 16), 0, 0, 0);
 511         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 512         return ret;
 513 }
 514
 515 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
 516                                         int status)
 517 {
 518         if (status & BIT(0)) {
 519                 /* Has hw-switch, sync sw_state to BIOS */
 520                 struct calling_interface_buffer buffer;
 521                 int block = rfkill_blocked(rfkill);
 522                 dell_fill_request(&buffer,
 523                                    1 | (radio << 8) | (block << 16), 0, 0, 0);
 524                 dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 525         } else {
 526                 /* No hw-switch, sync BIOS state to sw_state */
 527                 rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
 528         }
 529 }
 530
 531 static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
 532                                         int status, int hwswitch)
 533 {
 534         if (hwswitch & (BIT(radio - 1)))
 535                 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
 536 }
 537
 538 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 539 {
 540         int radio = ((unsigned long)data & 0xF);
 541         struct calling_interface_buffer buffer;
 542         int hwswitch;
 543         int status;
 544         int ret;
 545
 546         dell_fill_request(&buffer, 0, 0, 0, 0);
 547         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 548         status = buffer.output[1];
 549
 550         if (ret != 0 || !(status & BIT(0))) {
 551                 return;
 552         }
 553
 554         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 555         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 556         hwswitch = buffer.output[1];
 557
 558         if (ret != 0)
 559                 return;
 560
 561         dell_rfkill_update_hw_state(rfkill, radio, status, hwswitch);
 562 }
 563
 564 static const struct rfkill_ops dell_rfkill_ops = {
 565         .set_block = dell_rfkill_set,
 566         .query = dell_rfkill_query,
 567 };
 568
 569 static struct dentry *dell_laptop_dir;
 570
 571 static int dell_debugfs_show(struct seq_file *s, void *data)
 572 {
 573         struct calling_interface_buffer buffer;
 574         int hwswitch_state;
 575         int hwswitch_ret;
 576         int status;
 577         int ret;
 578
 579         dell_fill_request(&buffer, 0, 0, 0, 0);
 580         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 581         if (ret)
 582                 return ret;
 583         status = buffer.output[1];
 584
 585         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 586         hwswitch_ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 587         if (hwswitch_ret)
 588                 return hwswitch_ret;
 589         hwswitch_state = buffer.output[1];
 590
 591         seq_printf(s, "return:\t%d\n", ret);
 592         seq_printf(s, "status:\t0x%X\n", status);
 593         seq_printf(s, "Bit 0 : Hardware switch supported:   %lu\n",
 594                    status & BIT(0));
 595         seq_printf(s, "Bit 1 : Wifi locator supported:      %lu\n",
 596                   (status & BIT(1)) >> 1);
 597         seq_printf(s, "Bit 2 : Wifi is supported:           %lu\n",
 598                   (status & BIT(2)) >> 2);
 599         seq_printf(s, "Bit 3 : Bluetooth is supported:      %lu\n",
 600                   (status & BIT(3)) >> 3);
 601         seq_printf(s, "Bit 4 : WWAN is supported:           %lu\n",
 602                   (status & BIT(4)) >> 4);
 603         seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
 604                   (status & BIT(5)) >> 5);
 605         seq_printf(s, "Bit 6 : UWB supported:               %lu\n",
 606                   (status & BIT(6)) >> 6);
 607         seq_printf(s, "Bit 7 : WiGig supported:             %lu\n",
 608                   (status & BIT(7)) >> 7);
 609         seq_printf(s, "Bit 8 : Wifi is installed:           %lu\n",
 610                   (status & BIT(8)) >> 8);
 611         seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
 612                   (status & BIT(9)) >> 9);
 613         seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
 614                   (status & BIT(10)) >> 10);
 615         seq_printf(s, "Bit 11: UWB installed:               %lu\n",
 616                   (status & BIT(11)) >> 11);
 617         seq_printf(s, "Bit 12: WiGig installed:             %lu\n",
 618                   (status & BIT(12)) >> 12);
 619
 620         seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
 621                   (status & BIT(16)) >> 16);
 622         seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
 623                   (status & BIT(17)) >> 17);
 624         seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
 625                   (status & BIT(18)) >> 18);
 626         seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
 627                   (status & BIT(19)) >> 19);
 628         seq_printf(s, "Bit 20: UWB is blocked:              %lu\n",
 629                   (status & BIT(20)) >> 20);
 630         seq_printf(s, "Bit 21: WiGig is blocked:            %lu\n",
 631                   (status & BIT(21)) >> 21);
 632
 633         seq_printf(s, "\nhwswitch_return:\t%d\n", hwswitch_ret);
 634         seq_printf(s, "hwswitch_state:\t0x%X\n", hwswitch_state);
 635         seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
 636                    hwswitch_state & BIT(0));
 637         seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
 638                    (hwswitch_state & BIT(1)) >> 1);
 639         seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
 640                    (hwswitch_state & BIT(2)) >> 2);
 641         seq_printf(s, "Bit 3 : UWB controlled by switch:       %lu\n",
 642                    (hwswitch_state & BIT(3)) >> 3);
 643         seq_printf(s, "Bit 4 : WiGig controlled by switch:     %lu\n",
 644                    (hwswitch_state & BIT(4)) >> 4);
 645         seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
 646                    (hwswitch_state & BIT(7)) >> 7);
 647         seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
 648                    (hwswitch_state & BIT(8)) >> 8);
 649         seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
 650                    (hwswitch_state & BIT(15)) >> 15);
 651
 652         return 0;
 653 }
 654 DEFINE_SHOW_ATTRIBUTE(dell_debugfs);
 655
 656 static void dell_update_rfkill(struct work_struct *ignored)
 657 {
 658         struct calling_interface_buffer buffer;
 659         int hwswitch = 0;
 660         int status;
 661         int ret;
 662
 663         dell_fill_request(&buffer, 0, 0, 0, 0);
 664         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 665         status = buffer.output[1];
 666
 667         if (ret != 0)
 668                 return;
 669
 670         dell_fill_request(&buffer, 0x2, 0, 0, 0);
 671         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 672
 673         if (ret == 0 && (status & BIT(0)))
 674                 hwswitch = buffer.output[1];
 675
 676         if (wifi_rfkill) {
 677                 dell_rfkill_update_hw_state(wifi_rfkill, 1, status, hwswitch);
 678                 dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
 679         }
 680         if (bluetooth_rfkill) {
 681                 dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status,
 682                                             hwswitch);
 683                 dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
 684         }
 685         if (wwan_rfkill) {
 686                 dell_rfkill_update_hw_state(wwan_rfkill, 3, status, hwswitch);
 687                 dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
 688         }
 689 }
 690 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
 691
 692 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
 693                               struct serio *port)
 694 {
 695         static bool extended;
 696
 697         if (str & I8042_STR_AUXDATA)
 698                 return false;
 699
 700         if (unlikely(data == 0xe0)) {
 701                 extended = true;
 702                 return false;
 703         } else if (unlikely(extended)) {
 704                 switch (data) {
 705                 case 0x8:
 706                         schedule_delayed_work(&dell_rfkill_work,
 707                                               round_jiffies_relative(HZ / 4));
 708                         break;
 709                 }
 710                 extended = false;
 711         }
 712
 713         return false;
 714 }
 715
 716 static int (*dell_rbtn_notifier_register_func)(struct notifier_block *);
 717 static int (*dell_rbtn_notifier_unregister_func)(struct notifier_block *);
 718
 719 static int dell_laptop_rbtn_notifier_call(struct notifier_block *nb,
 720                                           unsigned long action, void *data)
 721 {
 722         schedule_delayed_work(&dell_rfkill_work, 0);
 723         return NOTIFY_OK;
 724 }
 725
 726 static struct notifier_block dell_laptop_rbtn_notifier = {
 727         .notifier_call = dell_laptop_rbtn_notifier_call,
 728 };
 729
 730 static int __init dell_setup_rfkill(void)
 731 {
 732         struct calling_interface_buffer buffer;
 733         int status, ret, whitelisted;
 734         const char *product;
 735
 736         /*
 737          * rfkill support causes trouble on various models, mostly Inspirons.
 738          * So we whitelist certain series, and don't support rfkill on others.
 739          */
 740         whitelisted = 0;
 741         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 742         if (product &&  (strncmp(product, "Latitude", 8) == 0 ||
 743                          strncmp(product, "Precision", 9) == 0))
 744                 whitelisted = 1;
 745         if (!force_rfkill && !whitelisted)
 746                 return 0;
 747
 748         dell_fill_request(&buffer, 0, 0, 0, 0);
 749         ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 750         status = buffer.output[1];
 751
 752         /* dell wireless info smbios call is not supported */
 753         if (ret != 0)
 754                 return 0;
 755
 756         /* rfkill is only tested on laptops with a hwswitch */
 757         if (!(status & BIT(0)) && !force_rfkill)
 758                 return 0;
 759
 760         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 761                 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
 762                                            RFKILL_TYPE_WLAN,
 763                                            &dell_rfkill_ops, (void *) 1);
 764                 if (!wifi_rfkill) {
 765                         ret = -ENOMEM;
 766                         goto err_wifi;
 767                 }
 768                 ret = rfkill_register(wifi_rfkill);
 769                 if (ret)
 770                         goto err_wifi;
 771         }
 772
 773         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 774                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
 775                                                 &platform_device->dev,
 776                                                 RFKILL_TYPE_BLUETOOTH,
 777                                                 &dell_rfkill_ops, (void *) 2);
 778                 if (!bluetooth_rfkill) {
 779                         ret = -ENOMEM;
 780                         goto err_bluetooth;
 781                 }
 782                 ret = rfkill_register(bluetooth_rfkill);
 783                 if (ret)
 784                         goto err_bluetooth;
 785         }
 786
 787         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 788                 wwan_rfkill = rfkill_alloc("dell-wwan",
 789                                            &platform_device->dev,
 790                                            RFKILL_TYPE_WWAN,
 791                                            &dell_rfkill_ops, (void *) 3);
 792                 if (!wwan_rfkill) {
 793                         ret = -ENOMEM;
 794                         goto err_wwan;
 795                 }
 796                 ret = rfkill_register(wwan_rfkill);
 797                 if (ret)
 798                         goto err_wwan;
 799         }
 800
 801         /*
 802          * Dell Airplane Mode Switch driver (dell-rbtn) supports ACPI devices
 803          * which can receive events from HW slider switch.
 804          *
 805          * Dell SMBIOS on whitelisted models supports controlling radio devices
 806          * but does not support receiving HW button switch events. We can use
 807          * i8042 filter hook function to receive keyboard data and handle
 808          * keycode for HW button.
 809          *
 810          * So if it is possible we will use Dell Airplane Mode Switch ACPI
 811          * driver for receiving HW events and Dell SMBIOS for setting rfkill
 812          * states. If ACPI driver or device is not available we will fallback to
 813          * i8042 filter hook function.
 814          *
 815          * To prevent duplicate rfkill devices which control and do same thing,
 816          * dell-rbtn driver will automatically remove its own rfkill devices
 817          * once function dell_rbtn_notifier_register() is called.
 818          */
 819
 820         dell_rbtn_notifier_register_func =
 821                 symbol_request(dell_rbtn_notifier_register);
 822         if (dell_rbtn_notifier_register_func) {
 823                 dell_rbtn_notifier_unregister_func =
 824                         symbol_request(dell_rbtn_notifier_unregister);
 825                 if (!dell_rbtn_notifier_unregister_func) {
 826                         symbol_put(dell_rbtn_notifier_register);
 827                         dell_rbtn_notifier_register_func = NULL;
 828                 }
 829         }
 830
 831         if (dell_rbtn_notifier_register_func) {
 832                 ret = dell_rbtn_notifier_register_func(
 833                         &dell_laptop_rbtn_notifier);
 834                 symbol_put(dell_rbtn_notifier_register);
 835                 dell_rbtn_notifier_register_func = NULL;
 836                 if (ret != 0) {
 837                         symbol_put(dell_rbtn_notifier_unregister);
 838                         dell_rbtn_notifier_unregister_func = NULL;
 839                 }
 840         } else {
 841                 pr_info("Symbols from dell-rbtn acpi driver are not available\n");
 842                 ret = -ENODEV;
 843         }
 844
 845         if (ret == 0) {
 846                 pr_info("Using dell-rbtn acpi driver for receiving events\n");
 847         } else if (ret != -ENODEV) {
 848                 pr_warn("Unable to register dell rbtn notifier\n");
 849                 goto err_filter;
 850         } else {
 851                 ret = i8042_install_filter(dell_laptop_i8042_filter);
 852                 if (ret) {
 853                         pr_warn("Unable to install key filter\n");
 854                         goto err_filter;
 855                 }
 856                 pr_info("Using i8042 filter function for receiving events\n");
 857         }
 858
 859         return 0;
 860 err_filter:
 861         if (wwan_rfkill)
 862                 rfkill_unregister(wwan_rfkill);
 863 err_wwan:
 864         rfkill_destroy(wwan_rfkill);
 865         if (bluetooth_rfkill)
 866                 rfkill_unregister(bluetooth_rfkill);
 867 err_bluetooth:
 868         rfkill_destroy(bluetooth_rfkill);
 869         if (wifi_rfkill)
 870                 rfkill_unregister(wifi_rfkill);
 871 err_wifi:
 872         rfkill_destroy(wifi_rfkill);
 873
 874         return ret;
 875 }
 876
 877 static void dell_cleanup_rfkill(void)
 878 {
 879         if (dell_rbtn_notifier_unregister_func) {
 880                 dell_rbtn_notifier_unregister_func(&dell_laptop_rbtn_notifier);
 881                 symbol_put(dell_rbtn_notifier_unregister);
 882                 dell_rbtn_notifier_unregister_func = NULL;
 883         } else {
 884                 i8042_remove_filter(dell_laptop_i8042_filter);
 885         }
 886         cancel_delayed_work_sync(&dell_rfkill_work);
 887         if (wifi_rfkill) {
 888                 rfkill_unregister(wifi_rfkill);
 889                 rfkill_destroy(wifi_rfkill);
 890         }
 891         if (bluetooth_rfkill) {
 892                 rfkill_unregister(bluetooth_rfkill);
 893                 rfkill_destroy(bluetooth_rfkill);
 894         }
 895         if (wwan_rfkill) {
 896                 rfkill_unregister(wwan_rfkill);
 897                 rfkill_destroy(wwan_rfkill);
 898         }
 899 }
 900
 901 static int dell_send_intensity(struct backlight_device *bd)
 902 {
 903         struct calling_interface_buffer buffer;
 904         struct calling_interface_token *token;
 905         int ret;
 906
 907         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
 908         if (!token)
 909                 return -ENODEV;
 910
 911         dell_fill_request(&buffer,
 912                            token->location, bd->props.brightness, 0, 0);
 913         if (power_supply_is_system_supplied() > 0)
 914                 ret = dell_send_request(&buffer,
 915                                         CLASS_TOKEN_WRITE, SELECT_TOKEN_AC);
 916         else
 917                 ret = dell_send_request(&buffer,
 918                                         CLASS_TOKEN_WRITE, SELECT_TOKEN_BAT);
 919
 920         return ret;
 921 }
 922
 923 static int dell_get_intensity(struct backlight_device *bd)
 924 {
 925         struct calling_interface_buffer buffer;
 926         struct calling_interface_token *token;
 927         int ret;
 928
 929         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
 930         if (!token)
 931                 return -ENODEV;
 932
 933         dell_fill_request(&buffer, token->location, 0, 0, 0);
 934         if (power_supply_is_system_supplied() > 0)
 935                 ret = dell_send_request(&buffer,
 936                                         CLASS_TOKEN_READ, SELECT_TOKEN_AC);
 937         else
 938                 ret = dell_send_request(&buffer,
 939                                         CLASS_TOKEN_READ, SELECT_TOKEN_BAT);
 940
 941         if (ret == 0)
 942                 ret = buffer.output[1];
 943
 944         return ret;
 945 }
 946
 947 static const struct backlight_ops dell_ops = {
 948         .get_brightness = dell_get_intensity,
 949         .update_status  = dell_send_intensity,
 950 };
 951
 952 static void touchpad_led_on(void)
 953 {
 954         int command = 0x97;
 955         char data = 1;
 956         i8042_command(&data, command | 1 << 12);
 957 }
 958
 959 static void touchpad_led_off(void)
 960 {
 961         int command = 0x97;
 962         char data = 2;
 963         i8042_command(&data, command | 1 << 12);
 964 }
 965
 966 static void touchpad_led_set(struct led_classdev *led_cdev,
 967         enum led_brightness value)
 968 {
 969         if (value > 0)
 970                 touchpad_led_on();
 971         else
 972                 touchpad_led_off();
 973 }
 974
 975 static struct led_classdev touchpad_led = {
 976         .name = "dell-laptop::touchpad",
 977         .brightness_set = touchpad_led_set,
 978         .flags = LED_CORE_SUSPENDRESUME,
 979 };
 980
 981 static int __init touchpad_led_init(struct device *dev)
 982 {
 983         return led_classdev_register(dev, &touchpad_led);
 984 }
 985
 986 static void touchpad_led_exit(void)
 987 {
 988         led_classdev_unregister(&touchpad_led);
 989 }
 990
 991 /*
 992  * Derived from information in smbios-keyboard-ctl:
 993  *
 994  * cbClass 4
 995  * cbSelect 11
 996  * Keyboard illumination
 997  * cbArg1 determines the function to be performed
 998  *
 999  * cbArg1 0x0 = Get Feature Information
1000  *  cbRES1         Standard return codes (0, -1, -2)
1001  *  cbRES2, word0  Bitmap of user-selectable modes
1002  *     bit 0     Always off (All systems)
1003  *     bit 1     Always on (Travis ATG, Siberia)
1004  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1005  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1006  *     bit 4     Auto: Input-activity-based On; input-activity based Off
1007  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1008  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1009  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1010  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1011  *     bits 9-15 Reserved for future use
1012  *  cbRES2, byte2  Reserved for future use
1013  *  cbRES2, byte3  Keyboard illumination type
1014  *     0         Reserved
1015  *     1         Tasklight
1016  *     2         Backlight
1017  *     3-255     Reserved for future use
1018  *  cbRES3, byte0  Supported auto keyboard illumination trigger bitmap.
1019  *     bit 0     Any keystroke
1020  *     bit 1     Touchpad activity
1021  *     bit 2     Pointing stick
1022  *     bit 3     Any mouse
1023  *     bits 4-7  Reserved for future use
1024  *  cbRES3, byte1  Supported timeout unit bitmap
1025  *     bit 0     Seconds
1026  *     bit 1     Minutes
1027  *     bit 2     Hours
1028  *     bit 3     Days
1029  *     bits 4-7  Reserved for future use
1030  *  cbRES3, byte2  Number of keyboard light brightness levels
1031  *  cbRES4, byte0  Maximum acceptable seconds value (0 if seconds not supported).
1032  *  cbRES4, byte1  Maximum acceptable minutes value (0 if minutes not supported).
1033  *  cbRES4, byte2  Maximum acceptable hours value (0 if hours not supported).
1034  *  cbRES4, byte3  Maximum acceptable days value (0 if days not supported)
1035  *
1036  * cbArg1 0x1 = Get Current State
1037  *  cbRES1         Standard return codes (0, -1, -2)
1038  *  cbRES2, word0  Bitmap of current mode state
1039  *     bit 0     Always off (All systems)
1040  *     bit 1     Always on (Travis ATG, Siberia)
1041  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1042  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1043  *     bit 4     Auto: Input-activity-based On; input-activity based Off
1044  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1045  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1046  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1047  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1048  *     bits 9-15 Reserved for future use
1049  *     Note: Only One bit can be set
1050  *  cbRES2, byte2  Currently active auto keyboard illumination triggers.
1051  *     bit 0     Any keystroke
1052  *     bit 1     Touchpad activity
1053  *     bit 2     Pointing stick
1054  *     bit 3     Any mouse
1055  *     bits 4-7  Reserved for future use
1056  *  cbRES2, byte3  Current Timeout on battery
1057  *     bits 7:6  Timeout units indicator:
1058  *     00b       Seconds
1059  *     01b       Minutes
1060  *     10b       Hours
1061  *     11b       Days
1062  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1063  *     NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte
1064  *     are set upon return from the [Get feature information] call.
1065  *  cbRES3, byte0  Current setting of ALS value that turns the light on or off.
1066  *  cbRES3, byte1  Current ALS reading
1067  *  cbRES3, byte2  Current keyboard light level.
1068  *  cbRES3, byte3  Current timeout on AC Power
1069  *     bits 7:6  Timeout units indicator:
1070  *     00b       Seconds
1071  *     01b       Minutes
1072  *     10b       Hours
1073  *     11b       Days
1074  *     Bits 5:0  Timeout value (0-63) in sec/min/hr/day
1075  *     NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte2
1076  *     are set upon return from the upon return from the [Get Feature information] call.
1077  *
1078  * cbArg1 0x2 = Set New State
1079  *  cbRES1         Standard return codes (0, -1, -2)
1080  *  cbArg2, word0  Bitmap of current mode state
1081  *     bit 0     Always off (All systems)
1082  *     bit 1     Always on (Travis ATG, Siberia)
1083  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1084  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1085  *     bit 4     Auto: Input-activity-based On; input-activity based Off
1086  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1087  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1088  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1089  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1090  *     bits 9-15 Reserved for future use
1091  *     Note: Only One bit can be set
1092  *  cbArg2, byte2  Desired auto keyboard illumination triggers. Must remain inactive to allow
1093  *                 keyboard to turn off automatically.
1094  *     bit 0     Any keystroke
1095  *     bit 1     Touchpad activity
1096  *     bit 2     Pointing stick
1097  *     bit 3     Any mouse
1098  *     bits 4-7  Reserved for future use
1099  *  cbArg2, byte3  Desired Timeout on battery
1100  *     bits 7:6  Timeout units indicator:
1101  *     00b       Seconds
1102  *     01b       Minutes
1103  *     10b       Hours
1104  *     11b       Days
1105  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1106  *  cbArg3, byte0  Desired setting of ALS value that turns the light on or off.
1107  *  cbArg3, byte2  Desired keyboard light level.
1108  *  cbArg3, byte3  Desired Timeout on AC power
1109  *     bits 7:6  Timeout units indicator:
1110  *     00b       Seconds
1111  *     01b       Minutes
1112  *     10b       Hours
1113  *     11b       Days
1114  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1115  */
1116
1117
1118 enum kbd_timeout_unit {
1119         KBD_TIMEOUT_SECONDS = 0,
1120         KBD_TIMEOUT_MINUTES,
1121         KBD_TIMEOUT_HOURS,
1122         KBD_TIMEOUT_DAYS,
1123 };
1124
1125 enum kbd_mode_bit {
1126         KBD_MODE_BIT_OFF = 0,
1127         KBD_MODE_BIT_ON,
1128         KBD_MODE_BIT_ALS,
1129         KBD_MODE_BIT_TRIGGER_ALS,
1130         KBD_MODE_BIT_TRIGGER,
1131         KBD_MODE_BIT_TRIGGER_25,
1132         KBD_MODE_BIT_TRIGGER_50,
1133         KBD_MODE_BIT_TRIGGER_75,
1134         KBD_MODE_BIT_TRIGGER_100,
1135 };
1136
1137 #define kbd_is_als_mode_bit(bit) \
1138         ((bit) == KBD_MODE_BIT_ALS || (bit) == KBD_MODE_BIT_TRIGGER_ALS)
1139 #define kbd_is_trigger_mode_bit(bit) \
1140         ((bit) >= KBD_MODE_BIT_TRIGGER_ALS && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1141 #define kbd_is_level_mode_bit(bit) \
1142         ((bit) >= KBD_MODE_BIT_TRIGGER_25 && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1143
1144 struct kbd_info {
1145         u16 modes;
1146         u8 type;
1147         u8 triggers;
1148         u8 levels;
1149         u8 seconds;
1150         u8 minutes;
1151         u8 hours;
1152         u8 days;
1153 };
1154
1155 struct kbd_state {
1156         u8 mode_bit;
1157         u8 triggers;
1158         u8 timeout_value;
1159         u8 timeout_unit;
1160         u8 timeout_value_ac;
1161         u8 timeout_unit_ac;
1162         u8 als_setting;
1163         u8 als_value;
1164         u8 level;
1165 };
1166
1167 static const int kbd_tokens[] = {
1168         KBD_LED_OFF_TOKEN,
1169         KBD_LED_AUTO_25_TOKEN,
1170         KBD_LED_AUTO_50_TOKEN,
1171         KBD_LED_AUTO_75_TOKEN,
1172         KBD_LED_AUTO_100_TOKEN,
1173         KBD_LED_ON_TOKEN,
1174 };
1175
1176 static u16 kbd_token_bits;
1177
1178 static struct kbd_info kbd_info;
1179 static bool kbd_als_supported;
1180 static bool kbd_triggers_supported;
1181 static bool kbd_timeout_ac_supported;
1182
1183 static u8 kbd_mode_levels[16];
1184 static int kbd_mode_levels_count;
1185
1186 static u8 kbd_previous_level;
1187 static u8 kbd_previous_mode_bit;
1188
1189 static bool kbd_led_present;
1190 static DEFINE_MUTEX(kbd_led_mutex);
1191 static enum led_brightness kbd_led_level;
1192
1193 /*
1194  * NOTE: there are three ways to set the keyboard backlight level.
1195  * First, via kbd_state.mode_bit (assigning KBD_MODE_BIT_TRIGGER_* value).
1196  * Second, via kbd_state.level (assigning numerical value <= kbd_info.levels).
1197  * Third, via SMBIOS tokens (KBD_LED_* in kbd_tokens)
1198  *
1199  * There are laptops which support only one of these methods. If we want to
1200  * support as many machines as possible we need to implement all three methods.
1201  * The first two methods use the kbd_state structure. The third uses SMBIOS
1202  * tokens. If kbd_info.levels == 0, the machine does not support setting the
1203  * keyboard backlight level via kbd_state.level.
1204  */
1205
1206 static int kbd_get_info(struct kbd_info *info)
1207 {
1208         struct calling_interface_buffer buffer;
1209         u8 units;
1210         int ret;
1211
1212         dell_fill_request(&buffer, 0, 0, 0, 0);
1213         ret = dell_send_request(&buffer,
1214                                 CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1215         if (ret)
1216                 return ret;
1217
1218         info->modes = buffer.output[1] & 0xFFFF;
1219         info->type = (buffer.output[1] >> 24) & 0xFF;
1220         info->triggers = buffer.output[2] & 0xFF;
1221         units = (buffer.output[2] >> 8) & 0xFF;
1222         info->levels = (buffer.output[2] >> 16) & 0xFF;
1223
1224         if (quirks && quirks->kbd_led_levels_off_1 && info->levels)
1225                 info->levels--;
1226
1227         if (units & BIT(0))
1228                 info->seconds = (buffer.output[3] >> 0) & 0xFF;
1229         if (units & BIT(1))
1230                 info->minutes = (buffer.output[3] >> 8) & 0xFF;
1231         if (units & BIT(2))
1232                 info->hours = (buffer.output[3] >> 16) & 0xFF;
1233         if (units & BIT(3))
1234                 info->days = (buffer.output[3] >> 24) & 0xFF;
1235
1236         return ret;
1237 }
1238
1239 static unsigned int kbd_get_max_level(void)
1240 {
1241         if (kbd_info.levels != 0)
1242                 return kbd_info.levels;
1243         if (kbd_mode_levels_count > 0)
1244                 return kbd_mode_levels_count - 1;
1245         return 0;
1246 }
1247
1248 static int kbd_get_level(struct kbd_state *state)
1249 {
1250         int i;
1251
1252         if (kbd_info.levels != 0)
1253                 return state->level;
1254
1255         if (kbd_mode_levels_count > 0) {
1256                 for (i = 0; i < kbd_mode_levels_count; ++i)
1257                         if (kbd_mode_levels[i] == state->mode_bit)
1258                                 return i;
1259                 return 0;
1260         }
1261
1262         return -EINVAL;
1263 }
1264
1265 static int kbd_set_level(struct kbd_state *state, u8 level)
1266 {
1267         if (kbd_info.levels != 0) {
1268                 if (level != 0)
1269                         kbd_previous_level = level;
1270                 if (state->level == level)
1271                         return 0;
1272                 state->level = level;
1273                 if (level != 0 && state->mode_bit == KBD_MODE_BIT_OFF)
1274                         state->mode_bit = kbd_previous_mode_bit;
1275                 else if (level == 0 && state->mode_bit != KBD_MODE_BIT_OFF) {
1276                         kbd_previous_mode_bit = state->mode_bit;
1277                         state->mode_bit = KBD_MODE_BIT_OFF;
1278                 }
1279                 return 0;
1280         }
1281
1282         if (kbd_mode_levels_count > 0 && level < kbd_mode_levels_count) {
1283                 if (level != 0)
1284                         kbd_previous_level = level;
1285                 state->mode_bit = kbd_mode_levels[level];
1286                 return 0;
1287         }
1288
1289         return -EINVAL;
1290 }
1291
1292 static int kbd_get_state(struct kbd_state *state)
1293 {
1294         struct calling_interface_buffer buffer;
1295         int ret;
1296
1297         dell_fill_request(&buffer, 0x1, 0, 0, 0);
1298         ret = dell_send_request(&buffer,
1299                                 CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1300         if (ret)
1301                 return ret;
1302
1303         state->mode_bit = ffs(buffer.output[1] & 0xFFFF);
1304         if (state->mode_bit != 0)
1305                 state->mode_bit--;
1306
1307         state->triggers = (buffer.output[1] >> 16) & 0xFF;
1308         state->timeout_value = (buffer.output[1] >> 24) & 0x3F;
1309         state->timeout_unit = (buffer.output[1] >> 30) & 0x3;
1310         state->als_setting = buffer.output[2] & 0xFF;
1311         state->als_value = (buffer.output[2] >> 8) & 0xFF;
1312         state->level = (buffer.output[2] >> 16) & 0xFF;
1313         state->timeout_value_ac = (buffer.output[2] >> 24) & 0x3F;
1314         state->timeout_unit_ac = (buffer.output[2] >> 30) & 0x3;
1315
1316         return ret;
1317 }
1318
1319 static int kbd_set_state(struct kbd_state *state)
1320 {
1321         struct calling_interface_buffer buffer;
1322         int ret;
1323         u32 input1;
1324         u32 input2;
1325
1326         input1 = BIT(state->mode_bit) & 0xFFFF;
1327         input1 |= (state->triggers & 0xFF) << 16;
1328         input1 |= (state->timeout_value & 0x3F) << 24;
1329         input1 |= (state->timeout_unit & 0x3) << 30;
1330         input2 = state->als_setting & 0xFF;
1331         input2 |= (state->level & 0xFF) << 16;
1332         input2 |= (state->timeout_value_ac & 0x3F) << 24;
1333         input2 |= (state->timeout_unit_ac & 0x3) << 30;
1334         dell_fill_request(&buffer, 0x2, input1, input2, 0);
1335         ret = dell_send_request(&buffer,
1336                                 CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1337
1338         return ret;
1339 }
1340
1341 static int kbd_set_state_safe(struct kbd_state *state, struct kbd_state *old)
1342 {
1343         int ret;
1344
1345         ret = kbd_set_state(state);
1346         if (ret == 0)
1347                 return 0;
1348
1349         /*
1350          * When setting the new state fails,try to restore the previous one.
1351          * This is needed on some machines where BIOS sets a default state when
1352          * setting a new state fails. This default state could be all off.
1353          */
1354
1355         if (kbd_set_state(old))
1356                 pr_err("Setting old previous keyboard state failed\n");
1357
1358         return ret;
1359 }
1360
1361 static int kbd_set_token_bit(u8 bit)
1362 {
1363         struct calling_interface_buffer buffer;
1364         struct calling_interface_token *token;
1365         int ret;
1366
1367         if (bit >= ARRAY_SIZE(kbd_tokens))
1368                 return -EINVAL;
1369
1370         token = dell_smbios_find_token(kbd_tokens[bit]);
1371         if (!token)
1372                 return -EINVAL;
1373
1374         dell_fill_request(&buffer, token->location, token->value, 0, 0);
1375         ret = dell_send_request(&buffer, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
1376
1377         return ret;
1378 }
1379
1380 static int kbd_get_token_bit(u8 bit)
1381 {
1382         struct calling_interface_buffer buffer;
1383         struct calling_interface_token *token;
1384         int ret;
1385         int val;
1386
1387         if (bit >= ARRAY_SIZE(kbd_tokens))
1388                 return -EINVAL;
1389
1390         token = dell_smbios_find_token(kbd_tokens[bit]);
1391         if (!token)
1392                 return -EINVAL;
1393
1394         dell_fill_request(&buffer, token->location, 0, 0, 0);
1395         ret = dell_send_request(&buffer, CLASS_TOKEN_READ, SELECT_TOKEN_STD);
1396         val = buffer.output[1];
1397
1398         if (ret)
1399                 return ret;
1400
1401         return (val == token->value);
1402 }
1403
1404 static int kbd_get_first_active_token_bit(void)
1405 {
1406         int i;
1407         int ret;
1408
1409         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i) {
1410                 ret = kbd_get_token_bit(i);
1411                 if (ret == 1)
1412                         return i;
1413         }
1414
1415         return ret;
1416 }
1417
1418 static int kbd_get_valid_token_counts(void)
1419 {
1420         return hweight16(kbd_token_bits);
1421 }
1422
1423 static inline int kbd_init_info(void)
1424 {
1425         struct kbd_state state;
1426         int ret;
1427         int i;
1428
1429         ret = kbd_get_info(&kbd_info);
1430         if (ret)
1431                 return ret;
1432
1433         /* NOTE: Old models without KBD_LED_AC_TOKEN token supports only one
1434          *       timeout value which is shared for both battery and AC power
1435          *       settings. So do not try to set AC values on old models.
1436          */
1437         if ((quirks && quirks->kbd_missing_ac_tag) ||
1438             dell_smbios_find_token(KBD_LED_AC_TOKEN))
1439                 kbd_timeout_ac_supported = true;
1440
1441         kbd_get_state(&state);
1442
1443         /* NOTE: timeout value is stored in 6 bits so max value is 63 */
1444         if (kbd_info.seconds > 63)
1445                 kbd_info.seconds = 63;
1446         if (kbd_info.minutes > 63)
1447                 kbd_info.minutes = 63;
1448         if (kbd_info.hours > 63)
1449                 kbd_info.hours = 63;
1450         if (kbd_info.days > 63)
1451                 kbd_info.days = 63;
1452
1453         /* NOTE: On tested machines ON mode did not work and caused
1454          *       problems (turned backlight off) so do not use it
1455          */
1456         kbd_info.modes &= ~BIT(KBD_MODE_BIT_ON);
1457
1458         kbd_previous_level = kbd_get_level(&state);
1459         kbd_previous_mode_bit = state.mode_bit;
1460
1461         if (kbd_previous_level == 0 && kbd_get_max_level() != 0)
1462                 kbd_previous_level = 1;
1463
1464         if (kbd_previous_mode_bit == KBD_MODE_BIT_OFF) {
1465                 kbd_previous_mode_bit =
1466                         ffs(kbd_info.modes & ~BIT(KBD_MODE_BIT_OFF));
1467                 if (kbd_previous_mode_bit != 0)
1468                         kbd_previous_mode_bit--;
1469         }
1470
1471         if (kbd_info.modes & (BIT(KBD_MODE_BIT_ALS) |
1472                               BIT(KBD_MODE_BIT_TRIGGER_ALS)))
1473                 kbd_als_supported = true;
1474
1475         if (kbd_info.modes & (
1476             BIT(KBD_MODE_BIT_TRIGGER_ALS) | BIT(KBD_MODE_BIT_TRIGGER) |
1477             BIT(KBD_MODE_BIT_TRIGGER_25) | BIT(KBD_MODE_BIT_TRIGGER_50) |
1478             BIT(KBD_MODE_BIT_TRIGGER_75) | BIT(KBD_MODE_BIT_TRIGGER_100)
1479            ))
1480                 kbd_triggers_supported = true;
1481
1482         /* kbd_mode_levels[0] is reserved, see below */
1483         for (i = 0; i < 16; ++i)
1484                 if (kbd_is_level_mode_bit(i) && (BIT(i) & kbd_info.modes))
1485                         kbd_mode_levels[1 + kbd_mode_levels_count++] = i;
1486
1487         /*
1488          * Find the first supported mode and assign to kbd_mode_levels[0].
1489          * This should be 0 (off), but we cannot depend on the BIOS to
1490          * support 0.
1491          */
1492         if (kbd_mode_levels_count > 0) {
1493                 for (i = 0; i < 16; ++i) {
1494                         if (BIT(i) & kbd_info.modes) {
1495                                 kbd_mode_levels[0] = i;
1496                                 break;
1497                         }
1498                 }
1499                 kbd_mode_levels_count++;
1500         }
1501
1502         return 0;
1503
1504 }
1505
1506 static inline void kbd_init_tokens(void)
1507 {
1508         int i;
1509
1510         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i)
1511                 if (dell_smbios_find_token(kbd_tokens[i]))
1512                         kbd_token_bits |= BIT(i);
1513 }
1514
1515 static void kbd_init(void)
1516 {
1517         int ret;
1518
1519         if (quirks && quirks->kbd_led_not_present)
1520                 return;
1521
1522         ret = kbd_init_info();
1523         kbd_init_tokens();
1524
1525         /*
1526          * Only supports keyboard backlight when it has at least two modes.
1527          */
1528         if ((ret == 0 && (kbd_info.levels != 0 || kbd_mode_levels_count >= 2))
1529             || kbd_get_valid_token_counts() >= 2)
1530                 kbd_led_present = true;
1531 }
1532
1533 static ssize_t kbd_led_timeout_store(struct device *dev,
1534                                      struct device_attribute *attr,
1535                                      const char *buf, size_t count)
1536 {
1537         struct kbd_state new_state;
1538         struct kbd_state state;
1539         bool convert;
1540         int value;
1541         int ret;
1542         char ch;
1543         u8 unit;
1544         int i;
1545
1546         ret = sscanf(buf, "%d %c", &value, &ch);
1547         if (ret < 1)
1548                 return -EINVAL;
1549         else if (ret == 1)
1550                 ch = 's';
1551
1552         if (value < 0)
1553                 return -EINVAL;
1554
1555         convert = false;
1556
1557         switch (ch) {
1558         case 's':
1559                 if (value > kbd_info.seconds)
1560                         convert = true;
1561                 unit = KBD_TIMEOUT_SECONDS;
1562                 break;
1563         case 'm':
1564                 if (value > kbd_info.minutes)
1565                         convert = true;
1566                 unit = KBD_TIMEOUT_MINUTES;
1567                 break;
1568         case 'h':
1569                 if (value > kbd_info.hours)
1570                         convert = true;
1571                 unit = KBD_TIMEOUT_HOURS;
1572                 break;
1573         case 'd':
1574                 if (value > kbd_info.days)
1575                         convert = true;
1576                 unit = KBD_TIMEOUT_DAYS;
1577                 break;
1578         default:
1579                 return -EINVAL;
1580         }
1581
1582         if (quirks && quirks->needs_kbd_timeouts)
1583                 convert = true;
1584
1585         if (convert) {
1586                 /* Convert value from current units to seconds */
1587                 switch (unit) {
1588                 case KBD_TIMEOUT_DAYS:
1589                         value *= 24;
1590                         fallthrough;
1591                 case KBD_TIMEOUT_HOURS:
1592                         value *= 60;
1593                         fallthrough;
1594                 case KBD_TIMEOUT_MINUTES:
1595                         value *= 60;
1596                         unit = KBD_TIMEOUT_SECONDS;
1597                 }
1598
1599                 if (quirks && quirks->needs_kbd_timeouts) {
1600                         for (i = 0; quirks->kbd_timeouts[i] != -1; i++) {
1601                                 if (value <= quirks->kbd_timeouts[i]) {
1602                                         value = quirks->kbd_timeouts[i];
1603                                         break;
1604                                 }
1605                         }
1606                 }
1607
1608                 if (value <= kbd_info.seconds && kbd_info.seconds) {
1609                         unit = KBD_TIMEOUT_SECONDS;
1610                 } else if (value / 60 <= kbd_info.minutes && kbd_info.minutes) {
1611                         value /= 60;
1612                         unit = KBD_TIMEOUT_MINUTES;
1613                 } else if (value / (60 * 60) <= kbd_info.hours && kbd_info.hours) {
1614                         value /= (60 * 60);
1615                         unit = KBD_TIMEOUT_HOURS;
1616                 } else if (value / (60 * 60 * 24) <= kbd_info.days && kbd_info.days) {
1617                         value /= (60 * 60 * 24);
1618                         unit = KBD_TIMEOUT_DAYS;
1619                 } else {
1620                         return -EINVAL;
1621                 }
1622         }
1623
1624         mutex_lock(&kbd_led_mutex);
1625
1626         ret = kbd_get_state(&state);
1627         if (ret)
1628                 goto out;
1629
1630         new_state = state;
1631
1632         if (kbd_timeout_ac_supported && power_supply_is_system_supplied() > 0) {
1633                 new_state.timeout_value_ac = value;
1634                 new_state.timeout_unit_ac = unit;
1635         } else {
1636                 new_state.timeout_value = value;
1637                 new_state.timeout_unit = unit;
1638         }
1639
1640         ret = kbd_set_state_safe(&new_state, &state);
1641         if (ret)
1642                 goto out;
1643
1644         ret = count;
1645 out:
1646         mutex_unlock(&kbd_led_mutex);
1647         return ret;
1648 }
1649
1650 static ssize_t kbd_led_timeout_show(struct device *dev,
1651                                     struct device_attribute *attr, char *buf)
1652 {
1653         struct kbd_state state;
1654         int value;
1655         int ret;
1656         int len;
1657         u8 unit;
1658
1659         ret = kbd_get_state(&state);
1660         if (ret)
1661                 return ret;
1662
1663         if (kbd_timeout_ac_supported && power_supply_is_system_supplied() > 0) {
1664                 value = state.timeout_value_ac;
1665                 unit = state.timeout_unit_ac;
1666         } else {
1667                 value = state.timeout_value;
1668                 unit = state.timeout_unit;
1669         }
1670
1671         len = sprintf(buf, "%d", value);
1672
1673         switch (unit) {
1674         case KBD_TIMEOUT_SECONDS:
1675                 return len + sprintf(buf+len, "s\n");
1676         case KBD_TIMEOUT_MINUTES:
1677                 return len + sprintf(buf+len, "m\n");
1678         case KBD_TIMEOUT_HOURS:
1679                 return len + sprintf(buf+len, "h\n");
1680         case KBD_TIMEOUT_DAYS:
1681                 return len + sprintf(buf+len, "d\n");
1682         default:
1683                 return -EINVAL;
1684         }
1685
1686         return len;
1687 }
1688
1689 static DEVICE_ATTR(stop_timeout, S_IRUGO | S_IWUSR,
1690                    kbd_led_timeout_show, kbd_led_timeout_store);
1691
1692 static const char * const kbd_led_triggers[] = {
1693         "keyboard",
1694         "touchpad",
1695         /*"trackstick"*/ NULL, /* NOTE: trackstick is just alias for touchpad */
1696         "mouse",
1697 };
1698
1699 static ssize_t kbd_led_triggers_store(struct device *dev,
1700                                       struct device_attribute *attr,
1701                                       const char *buf, size_t count)
1702 {
1703         struct kbd_state new_state;
1704         struct kbd_state state;
1705         bool triggers_enabled = false;
1706         int trigger_bit = -1;
1707         char trigger[21];
1708         int i, ret;
1709
1710         ret = sscanf(buf, "%20s", trigger);
1711         if (ret != 1)
1712                 return -EINVAL;
1713
1714         if (trigger[0] != '+' && trigger[0] != '-')
1715                 return -EINVAL;
1716
1717         mutex_lock(&kbd_led_mutex);
1718
1719         ret = kbd_get_state(&state);
1720         if (ret)
1721                 goto out;
1722
1723         if (kbd_triggers_supported)
1724                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1725
1726         if (kbd_triggers_supported) {
1727                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1728                         if (!(kbd_info.triggers & BIT(i)))
1729                                 continue;
1730                         if (!kbd_led_triggers[i])
1731                                 continue;
1732                         if (strcmp(trigger+1, kbd_led_triggers[i]) != 0)
1733                                 continue;
1734                         if (trigger[0] == '+' &&
1735                             triggers_enabled && (state.triggers & BIT(i))) {
1736                                 ret = count;
1737                                 goto out;
1738                         }
1739                         if (trigger[0] == '-' &&
1740                             (!triggers_enabled || !(state.triggers & BIT(i)))) {
1741                                 ret = count;
1742                                 goto out;
1743                         }
1744                         trigger_bit = i;
1745                         break;
1746                 }
1747         }
1748
1749         if (trigger_bit == -1) {
1750                 ret = -EINVAL;
1751                 goto out;
1752         }
1753
1754         new_state = state;
1755         if (trigger[0] == '+')
1756                 new_state.triggers |= BIT(trigger_bit);
1757         else {
1758                 new_state.triggers &= ~BIT(trigger_bit);
1759                 /*
1760                  * NOTE: trackstick bit (2) must be disabled when
1761                  *       disabling touchpad bit (1), otherwise touchpad
1762                  *       bit (1) will not be disabled
1763                  */
1764                 if (trigger_bit == 1)
1765                         new_state.triggers &= ~BIT(2);
1766         }
1767         if ((kbd_info.triggers & new_state.triggers) !=
1768             new_state.triggers) {
1769                 ret = -EINVAL;
1770                 goto out;
1771         }
1772         if (new_state.triggers && !triggers_enabled) {
1773                 new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1774                 kbd_set_level(&new_state, kbd_previous_level);
1775         } else if (new_state.triggers == 0) {
1776                 kbd_set_level(&new_state, 0);
1777         }
1778         if (!(kbd_info.modes & BIT(new_state.mode_bit))) {
1779                 ret = -EINVAL;
1780                 goto out;
1781         }
1782         ret = kbd_set_state_safe(&new_state, &state);
1783         if (ret)
1784                 goto out;
1785         if (new_state.mode_bit != KBD_MODE_BIT_OFF)
1786                 kbd_previous_mode_bit = new_state.mode_bit;
1787         ret = count;
1788 out:
1789         mutex_unlock(&kbd_led_mutex);
1790         return ret;
1791 }
1792
1793 static ssize_t kbd_led_triggers_show(struct device *dev,
1794                                      struct device_attribute *attr, char *buf)
1795 {
1796         struct kbd_state state;
1797         bool triggers_enabled;
1798         int level, i, ret;
1799         int len = 0;
1800
1801         ret = kbd_get_state(&state);
1802         if (ret)
1803                 return ret;
1804
1805         len = 0;
1806
1807         if (kbd_triggers_supported) {
1808                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1809                 level = kbd_get_level(&state);
1810                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1811                         if (!(kbd_info.triggers & BIT(i)))
1812                                 continue;
1813                         if (!kbd_led_triggers[i])
1814                                 continue;
1815                         if ((triggers_enabled || level <= 0) &&
1816                             (state.triggers & BIT(i)))
1817                                 buf[len++] = '+';
1818                         else
1819                                 buf[len++] = '-';
1820                         len += sprintf(buf+len, "%s ", kbd_led_triggers[i]);
1821                 }
1822         }
1823
1824         if (len)
1825                 buf[len - 1] = '\n';
1826
1827         return len;
1828 }
1829
1830 static DEVICE_ATTR(start_triggers, S_IRUGO | S_IWUSR,
1831                    kbd_led_triggers_show, kbd_led_triggers_store);
1832
1833 static ssize_t kbd_led_als_enabled_store(struct device *dev,
1834                                          struct device_attribute *attr,
1835                                          const char *buf, size_t count)
1836 {
1837         struct kbd_state new_state;
1838         struct kbd_state state;
1839         bool triggers_enabled = false;
1840         int enable;
1841         int ret;
1842
1843         ret = kstrtoint(buf, 0, &enable);
1844         if (ret)
1845                 return ret;
1846
1847         mutex_lock(&kbd_led_mutex);
1848
1849         ret = kbd_get_state(&state);
1850         if (ret)
1851                 goto out;
1852
1853         if (enable == kbd_is_als_mode_bit(state.mode_bit)) {
1854                 ret = count;
1855                 goto out;
1856         }
1857
1858         new_state = state;
1859
1860         if (kbd_triggers_supported)
1861                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1862
1863         if (enable) {
1864                 if (triggers_enabled)
1865                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER_ALS;
1866                 else
1867                         new_state.mode_bit = KBD_MODE_BIT_ALS;
1868         } else {
1869                 if (triggers_enabled) {
1870                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1871                         kbd_set_level(&new_state, kbd_previous_level);
1872                 } else {
1873                         new_state.mode_bit = KBD_MODE_BIT_ON;
1874                 }
1875         }
1876         if (!(kbd_info.modes & BIT(new_state.mode_bit)))  {
1877                 ret = -EINVAL;
1878                 goto out;
1879         }
1880
1881         ret = kbd_set_state_safe(&new_state, &state);
1882         if (ret)
1883                 goto out;
1884         kbd_previous_mode_bit = new_state.mode_bit;
1885
1886         ret = count;
1887 out:
1888         mutex_unlock(&kbd_led_mutex);
1889         return ret;
1890 }
1891
1892 static ssize_t kbd_led_als_enabled_show(struct device *dev,
1893                                         struct device_attribute *attr,
1894                                         char *buf)
1895 {
1896         struct kbd_state state;
1897         bool enabled = false;
1898         int ret;
1899
1900         ret = kbd_get_state(&state);
1901         if (ret)
1902                 return ret;
1903         enabled = kbd_is_als_mode_bit(state.mode_bit);
1904
1905         return sprintf(buf, "%d\n", enabled ? 1 : 0);
1906 }
1907
1908 static DEVICE_ATTR(als_enabled, S_IRUGO | S_IWUSR,
1909                    kbd_led_als_enabled_show, kbd_led_als_enabled_store);
1910
1911 static ssize_t kbd_led_als_setting_store(struct device *dev,
1912                                          struct device_attribute *attr,
1913                                          const char *buf, size_t count)
1914 {
1915         struct kbd_state state;
1916         struct kbd_state new_state;
1917         u8 setting;
1918         int ret;
1919
1920         ret = kstrtou8(buf, 10, &setting);
1921         if (ret)
1922                 return ret;
1923
1924         mutex_lock(&kbd_led_mutex);
1925
1926         ret = kbd_get_state(&state);
1927         if (ret)
1928                 goto out;
1929
1930         new_state = state;
1931         new_state.als_setting = setting;
1932
1933         ret = kbd_set_state_safe(&new_state, &state);
1934         if (ret)
1935                 goto out;
1936
1937         ret = count;
1938 out:
1939         mutex_unlock(&kbd_led_mutex);
1940         return ret;
1941 }
1942
1943 static ssize_t kbd_led_als_setting_show(struct device *dev,
1944                                         struct device_attribute *attr,
1945                                         char *buf)
1946 {
1947         struct kbd_state state;
1948         int ret;
1949
1950         ret = kbd_get_state(&state);
1951         if (ret)
1952                 return ret;
1953
1954         return sprintf(buf, "%d\n", state.als_setting);
1955 }
1956
1957 static DEVICE_ATTR(als_setting, S_IRUGO | S_IWUSR,
1958                    kbd_led_als_setting_show, kbd_led_als_setting_store);
1959
1960 static struct attribute *kbd_led_attrs[] = {
1961         &dev_attr_stop_timeout.attr,
1962         &dev_attr_start_triggers.attr,
1963         NULL,
1964 };
1965
1966 static const struct attribute_group kbd_led_group = {
1967         .attrs = kbd_led_attrs,
1968 };
1969
1970 static struct attribute *kbd_led_als_attrs[] = {
1971         &dev_attr_als_enabled.attr,
1972         &dev_attr_als_setting.attr,
1973         NULL,
1974 };
1975
1976 static const struct attribute_group kbd_led_als_group = {
1977         .attrs = kbd_led_als_attrs,
1978 };
1979
1980 static const struct attribute_group *kbd_led_groups[] = {
1981         &kbd_led_group,
1982         &kbd_led_als_group,
1983         NULL,
1984 };
1985
1986 static enum led_brightness kbd_led_level_get(struct led_classdev *led_cdev)
1987 {
1988         int ret;
1989         u16 num;
1990         struct kbd_state state;
1991
1992         if (kbd_get_max_level()) {
1993                 ret = kbd_get_state(&state);
1994                 if (ret)
1995                         return 0;
1996                 ret = kbd_get_level(&state);
1997                 if (ret < 0)
1998                         return 0;
1999                 return ret;
2000         }
2001
2002         if (kbd_get_valid_token_counts()) {
2003                 ret = kbd_get_first_active_token_bit();
2004                 if (ret < 0)
2005                         return 0;
2006                 for (num = kbd_token_bits; num != 0 && ret > 0; --ret)
2007                         num &= num - 1; /* clear the first bit set */
2008                 if (num == 0)
2009                         return 0;
2010                 return ffs(num) - 1;
2011         }
2012
2013         pr_warn("Keyboard brightness level control not supported\n");
2014         return 0;
2015 }
2016
2017 static int kbd_led_level_set(struct led_classdev *led_cdev,
2018                              enum led_brightness value)
2019 {
2020         enum led_brightness new_value = value;
2021         struct kbd_state state;
2022         struct kbd_state new_state;
2023         u16 num;
2024         int ret;
2025
2026         mutex_lock(&kbd_led_mutex);
2027
2028         if (kbd_get_max_level()) {
2029                 ret = kbd_get_state(&state);
2030                 if (ret)
2031                         goto out;
2032                 new_state = state;
2033                 ret = kbd_set_level(&new_state, value);
2034                 if (ret)
2035                         goto out;
2036                 ret = kbd_set_state_safe(&new_state, &state);
2037         } else if (kbd_get_valid_token_counts()) {
2038                 for (num = kbd_token_bits; num != 0 && value > 0; --value)
2039                         num &= num - 1; /* clear the first bit set */
2040                 if (num == 0)
2041                         ret = 0;
2042                 else
2043                         ret = kbd_set_token_bit(ffs(num) - 1);
2044         } else {
2045                 pr_warn("Keyboard brightness level control not supported\n");
2046                 ret = -ENXIO;
2047         }
2048
2049 out:
2050         if (ret == 0)
2051                 kbd_led_level = new_value;
2052
2053         mutex_unlock(&kbd_led_mutex);
2054         return ret;
2055 }
2056
2057 static struct led_classdev kbd_led = {
2058         .name           = "dell::kbd_backlight",
2059         .flags          = LED_BRIGHT_HW_CHANGED,
2060         .brightness_set_blocking = kbd_led_level_set,
2061         .brightness_get = kbd_led_level_get,
2062         .groups         = kbd_led_groups,
2063 };
2064
2065 static int __init kbd_led_init(struct device *dev)
2066 {
2067         int ret;
2068
2069         kbd_init();
2070         if (!kbd_led_present)
2071                 return -ENODEV;
2072         if (!kbd_als_supported)
2073                 kbd_led_groups[1] = NULL;
2074         kbd_led.max_brightness = kbd_get_max_level();
2075         if (!kbd_led.max_brightness) {
2076                 kbd_led.max_brightness = kbd_get_valid_token_counts();
2077                 if (kbd_led.max_brightness)
2078                         kbd_led.max_brightness--;
2079         }
2080
2081         kbd_led_level = kbd_led_level_get(NULL);
2082
2083         ret = led_classdev_register(dev, &kbd_led);
2084         if (ret)
2085                 kbd_led_present = false;
2086
2087         return ret;
2088 }
2089
2090 static void brightness_set_exit(struct led_classdev *led_cdev,
2091                                 enum led_brightness value)
2092 {
2093         /* Don't change backlight level on exit */
2094 };
2095
2096 static void kbd_led_exit(void)
2097 {
2098         if (!kbd_led_present)
2099                 return;
2100         kbd_led.brightness_set = brightness_set_exit;
2101         led_classdev_unregister(&kbd_led);
2102 }
2103
2104 static int dell_laptop_notifier_call(struct notifier_block *nb,
2105                                      unsigned long action, void *data)
2106 {
2107         bool changed = false;
2108         enum led_brightness new_kbd_led_level;
2109
2110         switch (action) {
2111         case DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED:
2112                 if (!kbd_led_present)
2113                         break;
2114
2115                 mutex_lock(&kbd_led_mutex);
2116                 new_kbd_led_level = kbd_led_level_get(&kbd_led);
2117                 if (kbd_led_level != new_kbd_led_level) {
2118                         kbd_led_level = new_kbd_led_level;
2119                         changed = true;
2120                 }
2121                 mutex_unlock(&kbd_led_mutex);
2122
2123                 if (changed)
2124                         led_classdev_notify_brightness_hw_changed(&kbd_led,
2125                                                                 kbd_led_level);
2126                 break;
2127         }
2128
2129         return NOTIFY_OK;
2130 }
2131
2132 static struct notifier_block dell_laptop_notifier = {
2133         .notifier_call = dell_laptop_notifier_call,
2134 };
2135
2136 static int micmute_led_set(struct led_classdev *led_cdev,
2137                            enum led_brightness brightness)
2138 {
2139         struct calling_interface_buffer buffer;
2140         struct calling_interface_token *token;
2141         int state = brightness != LED_OFF;
2142
2143         if (state == 0)
2144                 token = dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE);
2145         else
2146                 token = dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE);
2147
2148         if (!token)
2149                 return -ENODEV;
2150
2151         dell_fill_request(&buffer, token->location, token->value, 0, 0);
2152         dell_send_request(&buffer, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
2153
2154         return 0;
2155 }
2156
2157 static struct led_classdev micmute_led_cdev = {
2158         .name = "platform::micmute",
2159         .max_brightness = 1,
2160         .brightness_set_blocking = micmute_led_set,
2161         .default_trigger = "audio-micmute",
2162 };
2163
2164 static int __init dell_init(void)
2165 {
2166         struct calling_interface_token *token;
2167         int max_intensity = 0;
2168         int ret;
2169
2170         if (!dmi_check_system(dell_device_table))
2171                 return -ENODEV;
2172
2173         quirks = NULL;
2174         /* find if this machine support other functions */
2175         dmi_check_system(dell_quirks);
2176
2177         ret = platform_driver_register(&platform_driver);
2178         if (ret)
2179                 goto fail_platform_driver;
2180         platform_device = platform_device_alloc("dell-laptop", -1);
2181         if (!platform_device) {
2182                 ret = -ENOMEM;
2183                 goto fail_platform_device1;
2184         }
2185         ret = platform_device_add(platform_device);
2186         if (ret)
2187                 goto fail_platform_device2;
2188
2189         ret = dell_setup_rfkill();
2190
2191         if (ret) {
2192                 pr_warn("Unable to setup rfkill\n");
2193                 goto fail_rfkill;
2194         }
2195
2196         if (quirks && quirks->touchpad_led)
2197                 touchpad_led_init(&platform_device->dev);
2198
2199         kbd_led_init(&platform_device->dev);
2200
2201         dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
2202         debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
2203                             &dell_debugfs_fops);
2204
2205         dell_laptop_register_notifier(&dell_laptop_notifier);
2206
2207         if (dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE) &&
2208             dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE)) {
2209                 micmute_led_cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
2210                 ret = led_classdev_register(&platform_device->dev, &micmute_led_cdev);
2211                 if (ret < 0)
2212                         goto fail_led;
2213         }
2214
2215         if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
2216                 return 0;
2217
2218         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
2219         if (token) {
2220                 struct calling_interface_buffer buffer;
2221
2222                 dell_fill_request(&buffer, token->location, 0, 0, 0);
2223                 ret = dell_send_request(&buffer,
2224                                         CLASS_TOKEN_READ, SELECT_TOKEN_AC);
2225                 if (ret == 0)
2226                         max_intensity = buffer.output[3];
2227         }
2228
2229         if (max_intensity) {
2230                 struct backlight_properties props;
2231                 memset(&props, 0, sizeof(struct backlight_properties));
2232                 props.type = BACKLIGHT_PLATFORM;
2233                 props.max_brightness = max_intensity;
2234                 dell_backlight_device = backlight_device_register("dell_backlight",
2235                                                                   &platform_device->dev,
2236                                                                   NULL,
2237                                                                   &dell_ops,
2238                                                                   &props);
2239
2240                 if (IS_ERR(dell_backlight_device)) {
2241                         ret = PTR_ERR(dell_backlight_device);
2242                         dell_backlight_device = NULL;
2243                         goto fail_backlight;
2244                 }
2245
2246                 dell_backlight_device->props.brightness =
2247                         dell_get_intensity(dell_backlight_device);
2248                 if (dell_backlight_device->props.brightness < 0) {
2249                         ret = dell_backlight_device->props.brightness;
2250                         goto fail_get_brightness;
2251                 }
2252                 backlight_update_status(dell_backlight_device);
2253         }
2254
2255         return 0;
2256
2257 fail_get_brightness:
2258         backlight_device_unregister(dell_backlight_device);
2259 fail_backlight:
2260         led_classdev_unregister(&micmute_led_cdev);
2261 fail_led:
2262         dell_cleanup_rfkill();
2263 fail_rfkill:
2264         platform_device_del(platform_device);
2265 fail_platform_device2:
2266         platform_device_put(platform_device);
2267 fail_platform_device1:
2268         platform_driver_unregister(&platform_driver);
2269 fail_platform_driver:
2270         return ret;
2271 }
2272
2273 static void __exit dell_exit(void)
2274 {
2275         dell_laptop_unregister_notifier(&dell_laptop_notifier);
2276         debugfs_remove_recursive(dell_laptop_dir);
2277         if (quirks && quirks->touchpad_led)
2278                 touchpad_led_exit();
2279         kbd_led_exit();
2280         backlight_device_unregister(dell_backlight_device);
2281         led_classdev_unregister(&micmute_led_cdev);
2282         dell_cleanup_rfkill();
2283         if (platform_device) {
2284                 platform_device_unregister(platform_device);
2285                 platform_driver_unregister(&platform_driver);
2286         }
2287 }
2288
2289 /* dell-rbtn.c driver export functions which will not work correctly (and could
2290  * cause kernel crash) if they are called before dell-rbtn.c init code. This is
2291  * not problem when dell-rbtn.c is compiled as external module. When both files
2292  * (dell-rbtn.c and dell-laptop.c) are compiled statically into kernel, then we
2293  * need to ensure that dell_init() will be called after initializing dell-rbtn.
2294  * This can be achieved by late_initcall() instead module_init().
2295  */
2296 late_initcall(dell_init);
2297 module_exit(dell_exit);
2298
2299 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
2300 MODULE_AUTHOR("Gabriele Mazzotta <gabriele.mzt@gmail.com>");
2301 MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");
2302 MODULE_DESCRIPTION("Dell laptop driver");
2303 MODULE_LICENSE("GPL");