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

   1 /*
   2  *  Driver for Dell laptop extras
   3  *
   4  *  Copyright (c) Red Hat <mjg@redhat.com>
   5  *  Copyright (c) 2014 Gabriele Mazzotta <gabriele.mzt@gmail.com>
   6  *  Copyright (c) 2014 Pali Rohár <pali.rohar@gmail.com>
   7  *
   8  *  Based on documentation in the libsmbios package:
   9  *  Copyright (C) 2005-2014 Dell Inc.
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License version 2 as
  13  *  published by the Free Software Foundation.
  14  */
  15
  16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  17
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/backlight.h>
  23 #include <linux/err.h>
  24 #include <linux/dmi.h>
  25 #include <linux/io.h>
  26 #include <linux/rfkill.h>
  27 #include <linux/power_supply.h>
  28 #include <linux/acpi.h>
  29 #include <linux/mm.h>
  30 #include <linux/i8042.h>
  31 #include <linux/slab.h>
  32 #include <linux/debugfs.h>
  33 #include <linux/seq_file.h>
  34 #include "../../firmware/dcdbas.h"
  35
  36 #define BRIGHTNESS_TOKEN 0x7d
  37 #define KBD_LED_OFF_TOKEN 0x01E1
  38 #define KBD_LED_ON_TOKEN 0x01E2
  39 #define KBD_LED_AUTO_TOKEN 0x01E3
  40 #define KBD_LED_AUTO_25_TOKEN 0x02EA
  41 #define KBD_LED_AUTO_50_TOKEN 0x02EB
  42 #define KBD_LED_AUTO_75_TOKEN 0x02EC
  43 #define KBD_LED_AUTO_100_TOKEN 0x02F6
  44
  45 /* This structure will be modified by the firmware when we enter
  46  * system management mode, hence the volatiles */
  47
  48 struct calling_interface_buffer {
  49         u16 class;
  50         u16 select;
  51         volatile u32 input[4];
  52         volatile u32 output[4];
  53 } __packed;
  54
  55 struct calling_interface_token {
  56         u16 tokenID;
  57         u16 location;
  58         union {
  59                 u16 value;
  60                 u16 stringlength;
  61         };
  62 };
  63
  64 struct calling_interface_structure {
  65         struct dmi_header header;
  66         u16 cmdIOAddress;
  67         u8 cmdIOCode;
  68         u32 supportedCmds;
  69         struct calling_interface_token tokens[];
  70 } __packed;
  71
  72 struct quirk_entry {
  73         u8 touchpad_led;
  74
  75         int needs_kbd_timeouts;
  76         /*
  77          * Ordered list of timeouts expressed in seconds.
  78          * The list must end with -1
  79          */
  80         int kbd_timeouts[];
  81 };
  82
  83 static struct quirk_entry *quirks;
  84
  85 static struct quirk_entry quirk_dell_vostro_v130 = {
  86         .touchpad_led = 1,
  87 };
  88
  89 static int __init dmi_matched(const struct dmi_system_id *dmi)
  90 {
  91         quirks = dmi->driver_data;
  92         return 1;
  93 }
  94
  95 /*
  96  * These values come from Windows utility provided by Dell. If any other value
  97  * is used then BIOS silently set timeout to 0 without any error message.
  98  */
  99 static struct quirk_entry quirk_dell_xps13_9333 = {
 100         .needs_kbd_timeouts = 1,
 101         .kbd_timeouts = { 0, 5, 15, 60, 5 * 60, 15 * 60, -1 },
 102 };
 103
 104 static int da_command_address;
 105 static int da_command_code;
 106 static int da_num_tokens;
 107 static struct calling_interface_token *da_tokens;
 108
 109 static struct platform_driver platform_driver = {
 110         .driver = {
 111                 .name = "dell-laptop",
 112         }
 113 };
 114
 115 static struct platform_device *platform_device;
 116 static struct backlight_device *dell_backlight_device;
 117 static struct rfkill *wifi_rfkill;
 118 static struct rfkill *bluetooth_rfkill;
 119 static struct rfkill *wwan_rfkill;
 120 static bool force_rfkill;
 121
 122 module_param(force_rfkill, bool, 0444);
 123 MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
 124
 125 static const struct dmi_system_id dell_device_table[] __initconst = {
 126         {
 127                 .ident = "Dell laptop",
 128                 .matches = {
 129                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 130                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 131                 },
 132         },
 133         {
 134                 .matches = {
 135                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 136                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
 137                 },
 138         },
 139         {
 140                 .ident = "Dell Computer Corporation",
 141                 .matches = {
 142                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 143                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 144                 },
 145         },
 146         { }
 147 };
 148 MODULE_DEVICE_TABLE(dmi, dell_device_table);
 149
 150 static const struct dmi_system_id dell_quirks[] __initconst = {
 151         {
 152                 .callback = dmi_matched,
 153                 .ident = "Dell Vostro V130",
 154                 .matches = {
 155                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 156                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
 157                 },
 158                 .driver_data = &quirk_dell_vostro_v130,
 159         },
 160         {
 161                 .callback = dmi_matched,
 162                 .ident = "Dell Vostro V131",
 163                 .matches = {
 164                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 165                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 166                 },
 167                 .driver_data = &quirk_dell_vostro_v130,
 168         },
 169         {
 170                 .callback = dmi_matched,
 171                 .ident = "Dell Vostro 3350",
 172                 .matches = {
 173                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 174                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
 175                 },
 176                 .driver_data = &quirk_dell_vostro_v130,
 177         },
 178         {
 179                 .callback = dmi_matched,
 180                 .ident = "Dell Vostro 3555",
 181                 .matches = {
 182                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 183                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
 184                 },
 185                 .driver_data = &quirk_dell_vostro_v130,
 186         },
 187         {
 188                 .callback = dmi_matched,
 189                 .ident = "Dell Inspiron N311z",
 190                 .matches = {
 191                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 192                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
 193                 },
 194                 .driver_data = &quirk_dell_vostro_v130,
 195         },
 196         {
 197                 .callback = dmi_matched,
 198                 .ident = "Dell Inspiron M5110",
 199                 .matches = {
 200                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 201                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
 202                 },
 203                 .driver_data = &quirk_dell_vostro_v130,
 204         },
 205         {
 206                 .callback = dmi_matched,
 207                 .ident = "Dell Vostro 3360",
 208                 .matches = {
 209                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 210                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
 211                 },
 212                 .driver_data = &quirk_dell_vostro_v130,
 213         },
 214         {
 215                 .callback = dmi_matched,
 216                 .ident = "Dell Vostro 3460",
 217                 .matches = {
 218                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 219                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"),
 220                 },
 221                 .driver_data = &quirk_dell_vostro_v130,
 222         },
 223         {
 224                 .callback = dmi_matched,
 225                 .ident = "Dell Vostro 3560",
 226                 .matches = {
 227                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 228                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"),
 229                 },
 230                 .driver_data = &quirk_dell_vostro_v130,
 231         },
 232         {
 233                 .callback = dmi_matched,
 234                 .ident = "Dell Vostro 3450",
 235                 .matches = {
 236                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 237                         DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"),
 238                 },
 239                 .driver_data = &quirk_dell_vostro_v130,
 240         },
 241         {
 242                 .callback = dmi_matched,
 243                 .ident = "Dell Inspiron 5420",
 244                 .matches = {
 245                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 246                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"),
 247                 },
 248                 .driver_data = &quirk_dell_vostro_v130,
 249         },
 250         {
 251                 .callback = dmi_matched,
 252                 .ident = "Dell Inspiron 5520",
 253                 .matches = {
 254                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 255                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"),
 256                 },
 257                 .driver_data = &quirk_dell_vostro_v130,
 258         },
 259         {
 260                 .callback = dmi_matched,
 261                 .ident = "Dell Inspiron 5720",
 262                 .matches = {
 263                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 264                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"),
 265                 },
 266                 .driver_data = &quirk_dell_vostro_v130,
 267         },
 268         {
 269                 .callback = dmi_matched,
 270                 .ident = "Dell Inspiron 7420",
 271                 .matches = {
 272                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 273                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"),
 274                 },
 275                 .driver_data = &quirk_dell_vostro_v130,
 276         },
 277         {
 278                 .callback = dmi_matched,
 279                 .ident = "Dell Inspiron 7520",
 280                 .matches = {
 281                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 282                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
 283                 },
 284                 .driver_data = &quirk_dell_vostro_v130,
 285         },
 286         {
 287                 .callback = dmi_matched,
 288                 .ident = "Dell Inspiron 7720",
 289                 .matches = {
 290                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 291                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
 292                 },
 293                 .driver_data = &quirk_dell_vostro_v130,
 294         },
 295         {
 296                 .callback = dmi_matched,
 297                 .ident = "Dell XPS13 9333",
 298                 .matches = {
 299                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 300                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
 301                 },
 302                 .driver_data = &quirk_dell_xps13_9333,
 303         },
 304         { }
 305 };
 306
 307 static struct calling_interface_buffer *buffer;
 308 static struct page *bufferpage;
 309 static DEFINE_MUTEX(buffer_mutex);
 310
 311 static int hwswitch_state;
 312
 313 static void get_buffer(void)
 314 {
 315         mutex_lock(&buffer_mutex);
 316         memset(buffer, 0, sizeof(struct calling_interface_buffer));
 317 }
 318
 319 static void release_buffer(void)
 320 {
 321         mutex_unlock(&buffer_mutex);
 322 }
 323
 324 static void __init parse_da_table(const struct dmi_header *dm)
 325 {
 326         /* Final token is a terminator, so we don't want to copy it */
 327         int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
 328         struct calling_interface_token *new_da_tokens;
 329         struct calling_interface_structure *table =
 330                 container_of(dm, struct calling_interface_structure, header);
 331
 332         /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
 333            6 bytes of entry */
 334
 335         if (dm->length < 17)
 336                 return;
 337
 338         da_command_address = table->cmdIOAddress;
 339         da_command_code = table->cmdIOCode;
 340
 341         new_da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
 342                                  sizeof(struct calling_interface_token),
 343                                  GFP_KERNEL);
 344
 345         if (!new_da_tokens)
 346                 return;
 347         da_tokens = new_da_tokens;
 348
 349         memcpy(da_tokens+da_num_tokens, table->tokens,
 350                sizeof(struct calling_interface_token) * tokens);
 351
 352         da_num_tokens += tokens;
 353 }
 354
 355 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
 356 {
 357         switch (dm->type) {
 358         case 0xd4: /* Indexed IO */
 359         case 0xd5: /* Protected Area Type 1 */
 360         case 0xd6: /* Protected Area Type 2 */
 361                 break;
 362         case 0xda: /* Calling interface */
 363                 parse_da_table(dm);
 364                 break;
 365         }
 366 }
 367
 368 static int find_token_id(int tokenid)
 369 {
 370         int i;
 371
 372         for (i = 0; i < da_num_tokens; i++) {
 373                 if (da_tokens[i].tokenID == tokenid)
 374                         return i;
 375         }
 376
 377         return -1;
 378 }
 379
 380 static int find_token_location(int tokenid)
 381 {
 382         int id;
 383
 384         id = find_token_id(tokenid);
 385         if (id == -1)
 386                 return -1;
 387
 388         return da_tokens[id].location;
 389 }
 390
 391 static struct calling_interface_buffer *
 392 dell_send_request(struct calling_interface_buffer *buffer, int class,
 393                   int select)
 394 {
 395         struct smi_cmd command;
 396
 397         command.magic = SMI_CMD_MAGIC;
 398         command.command_address = da_command_address;
 399         command.command_code = da_command_code;
 400         command.ebx = virt_to_phys(buffer);
 401         command.ecx = 0x42534931;
 402
 403         buffer->class = class;
 404         buffer->select = select;
 405
 406         dcdbas_smi_request(&command);
 407
 408         return buffer;
 409 }
 410
 411 static inline int dell_smi_error(int value)
 412 {
 413         switch (value) {
 414         case 0: /* Completed successfully */
 415                 return 0;
 416         case -1: /* Completed with error */
 417                 return -EIO;
 418         case -2: /* Function not supported */
 419                 return -ENXIO;
 420         default: /* Unknown error */
 421                 return -EINVAL;
 422         }
 423 }
 424
 425 /* Derived from information in DellWirelessCtl.cpp:
 426    Class 17, select 11 is radio control. It returns an array of 32-bit values.
 427
 428    Input byte 0 = 0: Wireless information
 429
 430    result[0]: return code
 431    result[1]:
 432      Bit 0:      Hardware switch supported
 433      Bit 1:      Wifi locator supported
 434      Bit 2:      Wifi is supported
 435      Bit 3:      Bluetooth is supported
 436      Bit 4:      WWAN is supported
 437      Bit 5:      Wireless keyboard supported
 438      Bits 6-7:   Reserved
 439      Bit 8:      Wifi is installed
 440      Bit 9:      Bluetooth is installed
 441      Bit 10:     WWAN is installed
 442      Bits 11-15: Reserved
 443      Bit 16:     Hardware switch is on
 444      Bit 17:     Wifi is blocked
 445      Bit 18:     Bluetooth is blocked
 446      Bit 19:     WWAN is blocked
 447      Bits 20-31: Reserved
 448    result[2]: NVRAM size in bytes
 449    result[3]: NVRAM format version number
 450
 451    Input byte 0 = 2: Wireless switch configuration
 452    result[0]: return code
 453    result[1]:
 454      Bit 0:      Wifi controlled by switch
 455      Bit 1:      Bluetooth controlled by switch
 456      Bit 2:      WWAN controlled by switch
 457      Bits 3-6:   Reserved
 458      Bit 7:      Wireless switch config locked
 459      Bit 8:      Wifi locator enabled
 460      Bits 9-14:  Reserved
 461      Bit 15:     Wifi locator setting locked
 462      Bits 16-31: Reserved
 463 */
 464
 465 static int dell_rfkill_set(void *data, bool blocked)
 466 {
 467         int disable = blocked ? 1 : 0;
 468         unsigned long radio = (unsigned long)data;
 469         int hwswitch_bit = (unsigned long)data - 1;
 470
 471         get_buffer();
 472         dell_send_request(buffer, 17, 11);
 473
 474         /* If the hardware switch controls this radio, and the hardware
 475            switch is disabled, always disable the radio */
 476         if ((hwswitch_state & BIT(hwswitch_bit)) &&
 477             !(buffer->output[1] & BIT(16)))
 478                 disable = 1;
 479
 480         buffer->input[0] = (1 | (radio<<8) | (disable << 16));
 481         dell_send_request(buffer, 17, 11);
 482
 483         release_buffer();
 484         return 0;
 485 }
 486
 487 /* Must be called with the buffer held */
 488 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
 489                                         int status)
 490 {
 491         if (status & BIT(0)) {
 492                 /* Has hw-switch, sync sw_state to BIOS */
 493                 int block = rfkill_blocked(rfkill);
 494                 buffer->input[0] = (1 | (radio << 8) | (block << 16));
 495                 dell_send_request(buffer, 17, 11);
 496         } else {
 497                 /* No hw-switch, sync BIOS state to sw_state */
 498                 rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
 499         }
 500 }
 501
 502 static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
 503                                         int status)
 504 {
 505         if (hwswitch_state & (BIT(radio - 1)))
 506                 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
 507 }
 508
 509 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 510 {
 511         int status;
 512
 513         get_buffer();
 514         dell_send_request(buffer, 17, 11);
 515         status = buffer->output[1];
 516
 517         dell_rfkill_update_hw_state(rfkill, (unsigned long)data, status);
 518
 519         release_buffer();
 520 }
 521
 522 static const struct rfkill_ops dell_rfkill_ops = {
 523         .set_block = dell_rfkill_set,
 524         .query = dell_rfkill_query,
 525 };
 526
 527 static struct dentry *dell_laptop_dir;
 528
 529 static int dell_debugfs_show(struct seq_file *s, void *data)
 530 {
 531         int status;
 532
 533         get_buffer();
 534         dell_send_request(buffer, 17, 11);
 535         status = buffer->output[1];
 536         release_buffer();
 537
 538         seq_printf(s, "status:\t0x%X\n", status);
 539         seq_printf(s, "Bit 0 : Hardware switch supported:   %lu\n",
 540                    status & BIT(0));
 541         seq_printf(s, "Bit 1 : Wifi locator supported:      %lu\n",
 542                   (status & BIT(1)) >> 1);
 543         seq_printf(s, "Bit 2 : Wifi is supported:           %lu\n",
 544                   (status & BIT(2)) >> 2);
 545         seq_printf(s, "Bit 3 : Bluetooth is supported:      %lu\n",
 546                   (status & BIT(3)) >> 3);
 547         seq_printf(s, "Bit 4 : WWAN is supported:           %lu\n",
 548                   (status & BIT(4)) >> 4);
 549         seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
 550                   (status & BIT(5)) >> 5);
 551         seq_printf(s, "Bit 8 : Wifi is installed:           %lu\n",
 552                   (status & BIT(8)) >> 8);
 553         seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
 554                   (status & BIT(9)) >> 9);
 555         seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
 556                   (status & BIT(10)) >> 10);
 557         seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
 558                   (status & BIT(16)) >> 16);
 559         seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
 560                   (status & BIT(17)) >> 17);
 561         seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
 562                   (status & BIT(18)) >> 18);
 563         seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
 564                   (status & BIT(19)) >> 19);
 565
 566         seq_printf(s, "\nhwswitch_state:\t0x%X\n", hwswitch_state);
 567         seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
 568                    hwswitch_state & BIT(0));
 569         seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
 570                    (hwswitch_state & BIT(1)) >> 1);
 571         seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
 572                    (hwswitch_state & BIT(2)) >> 2);
 573         seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
 574                    (hwswitch_state & BIT(7)) >> 7);
 575         seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
 576                    (hwswitch_state & BIT(8)) >> 8);
 577         seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
 578                    (hwswitch_state & BIT(15)) >> 15);
 579
 580         return 0;
 581 }
 582
 583 static int dell_debugfs_open(struct inode *inode, struct file *file)
 584 {
 585         return single_open(file, dell_debugfs_show, inode->i_private);
 586 }
 587
 588 static const struct file_operations dell_debugfs_fops = {
 589         .owner = THIS_MODULE,
 590         .open = dell_debugfs_open,
 591         .read = seq_read,
 592         .llseek = seq_lseek,
 593         .release = single_release,
 594 };
 595
 596 static void dell_update_rfkill(struct work_struct *ignored)
 597 {
 598         int status;
 599
 600         get_buffer();
 601         dell_send_request(buffer, 17, 11);
 602         status = buffer->output[1];
 603
 604         if (wifi_rfkill) {
 605                 dell_rfkill_update_hw_state(wifi_rfkill, 1, status);
 606                 dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
 607         }
 608         if (bluetooth_rfkill) {
 609                 dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status);
 610                 dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
 611         }
 612         if (wwan_rfkill) {
 613                 dell_rfkill_update_hw_state(wwan_rfkill, 3, status);
 614                 dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
 615         }
 616
 617         release_buffer();
 618 }
 619 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
 620
 621 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
 622                               struct serio *port)
 623 {
 624         static bool extended;
 625
 626         if (str & I8042_STR_AUXDATA)
 627                 return false;
 628
 629         if (unlikely(data == 0xe0)) {
 630                 extended = true;
 631                 return false;
 632         } else if (unlikely(extended)) {
 633                 switch (data) {
 634                 case 0x8:
 635                         schedule_delayed_work(&dell_rfkill_work,
 636                                               round_jiffies_relative(HZ / 4));
 637                         break;
 638                 }
 639                 extended = false;
 640         }
 641
 642         return false;
 643 }
 644
 645 static int __init dell_setup_rfkill(void)
 646 {
 647         int status, ret, whitelisted;
 648         const char *product;
 649
 650         /*
 651          * rfkill support causes trouble on various models, mostly Inspirons.
 652          * So we whitelist certain series, and don't support rfkill on others.
 653          */
 654         whitelisted = 0;
 655         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 656         if (product &&  (strncmp(product, "Latitude", 8) == 0 ||
 657                          strncmp(product, "Precision", 9) == 0))
 658                 whitelisted = 1;
 659         if (!force_rfkill && !whitelisted)
 660                 return 0;
 661
 662         get_buffer();
 663         dell_send_request(buffer, 17, 11);
 664         status = buffer->output[1];
 665         buffer->input[0] = 0x2;
 666         dell_send_request(buffer, 17, 11);
 667         hwswitch_state = buffer->output[1];
 668         release_buffer();
 669
 670         if (!(status & BIT(0))) {
 671                 if (force_rfkill) {
 672                         /* No hwsitch, clear all hw-controlled bits */
 673                         hwswitch_state &= ~7;
 674                 } else {
 675                         /* rfkill is only tested on laptops with a hwswitch */
 676                         return 0;
 677                 }
 678         }
 679
 680         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 681                 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
 682                                            RFKILL_TYPE_WLAN,
 683                                            &dell_rfkill_ops, (void *) 1);
 684                 if (!wifi_rfkill) {
 685                         ret = -ENOMEM;
 686                         goto err_wifi;
 687                 }
 688                 ret = rfkill_register(wifi_rfkill);
 689                 if (ret)
 690                         goto err_wifi;
 691         }
 692
 693         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 694                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
 695                                                 &platform_device->dev,
 696                                                 RFKILL_TYPE_BLUETOOTH,
 697                                                 &dell_rfkill_ops, (void *) 2);
 698                 if (!bluetooth_rfkill) {
 699                         ret = -ENOMEM;
 700                         goto err_bluetooth;
 701                 }
 702                 ret = rfkill_register(bluetooth_rfkill);
 703                 if (ret)
 704                         goto err_bluetooth;
 705         }
 706
 707         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 708                 wwan_rfkill = rfkill_alloc("dell-wwan",
 709                                            &platform_device->dev,
 710                                            RFKILL_TYPE_WWAN,
 711                                            &dell_rfkill_ops, (void *) 3);
 712                 if (!wwan_rfkill) {
 713                         ret = -ENOMEM;
 714                         goto err_wwan;
 715                 }
 716                 ret = rfkill_register(wwan_rfkill);
 717                 if (ret)
 718                         goto err_wwan;
 719         }
 720
 721         ret = i8042_install_filter(dell_laptop_i8042_filter);
 722         if (ret) {
 723                 pr_warn("Unable to install key filter\n");
 724                 goto err_filter;
 725         }
 726
 727         return 0;
 728 err_filter:
 729         if (wwan_rfkill)
 730                 rfkill_unregister(wwan_rfkill);
 731 err_wwan:
 732         rfkill_destroy(wwan_rfkill);
 733         if (bluetooth_rfkill)
 734                 rfkill_unregister(bluetooth_rfkill);
 735 err_bluetooth:
 736         rfkill_destroy(bluetooth_rfkill);
 737         if (wifi_rfkill)
 738                 rfkill_unregister(wifi_rfkill);
 739 err_wifi:
 740         rfkill_destroy(wifi_rfkill);
 741
 742         return ret;
 743 }
 744
 745 static void dell_cleanup_rfkill(void)
 746 {
 747         if (wifi_rfkill) {
 748                 rfkill_unregister(wifi_rfkill);
 749                 rfkill_destroy(wifi_rfkill);
 750         }
 751         if (bluetooth_rfkill) {
 752                 rfkill_unregister(bluetooth_rfkill);
 753                 rfkill_destroy(bluetooth_rfkill);
 754         }
 755         if (wwan_rfkill) {
 756                 rfkill_unregister(wwan_rfkill);
 757                 rfkill_destroy(wwan_rfkill);
 758         }
 759 }
 760
 761 static int dell_send_intensity(struct backlight_device *bd)
 762 {
 763         int ret = 0;
 764
 765         get_buffer();
 766         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
 767         buffer->input[1] = bd->props.brightness;
 768
 769         if (buffer->input[0] == -1) {
 770                 ret = -ENODEV;
 771                 goto out;
 772         }
 773
 774         if (power_supply_is_system_supplied() > 0)
 775                 dell_send_request(buffer, 1, 2);
 776         else
 777                 dell_send_request(buffer, 1, 1);
 778
 779  out:
 780         release_buffer();
 781         return ret;
 782 }
 783
 784 static int dell_get_intensity(struct backlight_device *bd)
 785 {
 786         int ret = 0;
 787
 788         get_buffer();
 789         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
 790
 791         if (buffer->input[0] == -1) {
 792                 ret = -ENODEV;
 793                 goto out;
 794         }
 795
 796         if (power_supply_is_system_supplied() > 0)
 797                 dell_send_request(buffer, 0, 2);
 798         else
 799                 dell_send_request(buffer, 0, 1);
 800
 801         ret = buffer->output[1];
 802
 803  out:
 804         release_buffer();
 805         return ret;
 806 }
 807
 808 static const struct backlight_ops dell_ops = {
 809         .get_brightness = dell_get_intensity,
 810         .update_status  = dell_send_intensity,
 811 };
 812
 813 static void touchpad_led_on(void)
 814 {
 815         int command = 0x97;
 816         char data = 1;
 817         i8042_command(&data, command | 1 << 12);
 818 }
 819
 820 static void touchpad_led_off(void)
 821 {
 822         int command = 0x97;
 823         char data = 2;
 824         i8042_command(&data, command | 1 << 12);
 825 }
 826
 827 static void touchpad_led_set(struct led_classdev *led_cdev,
 828         enum led_brightness value)
 829 {
 830         if (value > 0)
 831                 touchpad_led_on();
 832         else
 833                 touchpad_led_off();
 834 }
 835
 836 static struct led_classdev touchpad_led = {
 837         .name = "dell-laptop::touchpad",
 838         .brightness_set = touchpad_led_set,
 839         .flags = LED_CORE_SUSPENDRESUME,
 840 };
 841
 842 static int __init touchpad_led_init(struct device *dev)
 843 {
 844         return led_classdev_register(dev, &touchpad_led);
 845 }
 846
 847 static void touchpad_led_exit(void)
 848 {
 849         led_classdev_unregister(&touchpad_led);
 850 }
 851
 852 /*
 853  * Derived from information in smbios-keyboard-ctl:
 854  *
 855  * cbClass 4
 856  * cbSelect 11
 857  * Keyboard illumination
 858  * cbArg1 determines the function to be performed
 859  *
 860  * cbArg1 0x0 = Get Feature Information
 861  *  cbRES1         Standard return codes (0, -1, -2)
 862  *  cbRES2, word0  Bitmap of user-selectable modes
 863  *     bit 0     Always off (All systems)
 864  *     bit 1     Always on (Travis ATG, Siberia)
 865  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
 866  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
 867  *     bit 4     Auto: Input-activity-based On; input-activity based Off
 868  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
 869  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
 870  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
 871  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
 872  *     bits 9-15 Reserved for future use
 873  *  cbRES2, byte2  Reserved for future use
 874  *  cbRES2, byte3  Keyboard illumination type
 875  *     0         Reserved
 876  *     1         Tasklight
 877  *     2         Backlight
 878  *     3-255     Reserved for future use
 879  *  cbRES3, byte0  Supported auto keyboard illumination trigger bitmap.
 880  *     bit 0     Any keystroke
 881  *     bit 1     Touchpad activity
 882  *     bit 2     Pointing stick
 883  *     bit 3     Any mouse
 884  *     bits 4-7  Reserved for future use
 885  *  cbRES3, byte1  Supported timeout unit bitmap
 886  *     bit 0     Seconds
 887  *     bit 1     Minutes
 888  *     bit 2     Hours
 889  *     bit 3     Days
 890  *     bits 4-7  Reserved for future use
 891  *  cbRES3, byte2  Number of keyboard light brightness levels
 892  *  cbRES4, byte0  Maximum acceptable seconds value (0 if seconds not supported).
 893  *  cbRES4, byte1  Maximum acceptable minutes value (0 if minutes not supported).
 894  *  cbRES4, byte2  Maximum acceptable hours value (0 if hours not supported).
 895  *  cbRES4, byte3  Maximum acceptable days value (0 if days not supported)
 896  *
 897  * cbArg1 0x1 = Get Current State
 898  *  cbRES1         Standard return codes (0, -1, -2)
 899  *  cbRES2, word0  Bitmap of current mode state
 900  *     bit 0     Always off (All systems)
 901  *     bit 1     Always on (Travis ATG, Siberia)
 902  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
 903  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
 904  *     bit 4     Auto: Input-activity-based On; input-activity based Off
 905  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
 906  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
 907  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
 908  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
 909  *     bits 9-15 Reserved for future use
 910  *     Note: Only One bit can be set
 911  *  cbRES2, byte2  Currently active auto keyboard illumination triggers.
 912  *     bit 0     Any keystroke
 913  *     bit 1     Touchpad activity
 914  *     bit 2     Pointing stick
 915  *     bit 3     Any mouse
 916  *     bits 4-7  Reserved for future use
 917  *  cbRES2, byte3  Current Timeout
 918  *     bits 7:6  Timeout units indicator:
 919  *     00b       Seconds
 920  *     01b       Minutes
 921  *     10b       Hours
 922  *     11b       Days
 923  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
 924  *     NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte
 925  *     are set upon return from the [Get feature information] call.
 926  *  cbRES3, byte0  Current setting of ALS value that turns the light on or off.
 927  *  cbRES3, byte1  Current ALS reading
 928  *  cbRES3, byte2  Current keyboard light level.
 929  *
 930  * cbArg1 0x2 = Set New State
 931  *  cbRES1         Standard return codes (0, -1, -2)
 932  *  cbArg2, word0  Bitmap of current mode state
 933  *     bit 0     Always off (All systems)
 934  *     bit 1     Always on (Travis ATG, Siberia)
 935  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
 936  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
 937  *     bit 4     Auto: Input-activity-based On; input-activity based Off
 938  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
 939  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
 940  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
 941  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
 942  *     bits 9-15 Reserved for future use
 943  *     Note: Only One bit can be set
 944  *  cbArg2, byte2  Desired auto keyboard illumination triggers. Must remain inactive to allow
 945  *                 keyboard to turn off automatically.
 946  *     bit 0     Any keystroke
 947  *     bit 1     Touchpad activity
 948  *     bit 2     Pointing stick
 949  *     bit 3     Any mouse
 950  *     bits 4-7  Reserved for future use
 951  *  cbArg2, byte3  Desired Timeout
 952  *     bits 7:6  Timeout units indicator:
 953  *     00b       Seconds
 954  *     01b       Minutes
 955  *     10b       Hours
 956  *     11b       Days
 957  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
 958  *  cbArg3, byte0  Desired setting of ALS value that turns the light on or off.
 959  *  cbArg3, byte2  Desired keyboard light level.
 960  */
 961
 962
 963 enum kbd_timeout_unit {
 964         KBD_TIMEOUT_SECONDS = 0,
 965         KBD_TIMEOUT_MINUTES,
 966         KBD_TIMEOUT_HOURS,
 967         KBD_TIMEOUT_DAYS,
 968 };
 969
 970 enum kbd_mode_bit {
 971         KBD_MODE_BIT_OFF = 0,
 972         KBD_MODE_BIT_ON,
 973         KBD_MODE_BIT_ALS,
 974         KBD_MODE_BIT_TRIGGER_ALS,
 975         KBD_MODE_BIT_TRIGGER,
 976         KBD_MODE_BIT_TRIGGER_25,
 977         KBD_MODE_BIT_TRIGGER_50,
 978         KBD_MODE_BIT_TRIGGER_75,
 979         KBD_MODE_BIT_TRIGGER_100,
 980 };
 981
 982 #define kbd_is_als_mode_bit(bit) \
 983         ((bit) == KBD_MODE_BIT_ALS || (bit) == KBD_MODE_BIT_TRIGGER_ALS)
 984 #define kbd_is_trigger_mode_bit(bit) \
 985         ((bit) >= KBD_MODE_BIT_TRIGGER_ALS && (bit) <= KBD_MODE_BIT_TRIGGER_100)
 986 #define kbd_is_level_mode_bit(bit) \
 987         ((bit) >= KBD_MODE_BIT_TRIGGER_25 && (bit) <= KBD_MODE_BIT_TRIGGER_100)
 988
 989 struct kbd_info {
 990         u16 modes;
 991         u8 type;
 992         u8 triggers;
 993         u8 levels;
 994         u8 seconds;
 995         u8 minutes;
 996         u8 hours;
 997         u8 days;
 998 };
 999
1000 struct kbd_state {
1001         u8 mode_bit;
1002         u8 triggers;
1003         u8 timeout_value;
1004         u8 timeout_unit;
1005         u8 als_setting;
1006         u8 als_value;
1007         u8 level;
1008 };
1009
1010 static const int kbd_tokens[] = {
1011         KBD_LED_OFF_TOKEN,
1012         KBD_LED_AUTO_25_TOKEN,
1013         KBD_LED_AUTO_50_TOKEN,
1014         KBD_LED_AUTO_75_TOKEN,
1015         KBD_LED_AUTO_100_TOKEN,
1016         KBD_LED_ON_TOKEN,
1017 };
1018
1019 static u16 kbd_token_bits;
1020
1021 static struct kbd_info kbd_info;
1022 static bool kbd_als_supported;
1023 static bool kbd_triggers_supported;
1024
1025 static u8 kbd_mode_levels[16];
1026 static int kbd_mode_levels_count;
1027
1028 static u8 kbd_previous_level;
1029 static u8 kbd_previous_mode_bit;
1030
1031 static bool kbd_led_present;
1032
1033 /*
1034  * NOTE: there are three ways to set the keyboard backlight level.
1035  * First, via kbd_state.mode_bit (assigning KBD_MODE_BIT_TRIGGER_* value).
1036  * Second, via kbd_state.level (assigning numerical value <= kbd_info.levels).
1037  * Third, via SMBIOS tokens (KBD_LED_* in kbd_tokens)
1038  *
1039  * There are laptops which support only one of these methods. If we want to
1040  * support as many machines as possible we need to implement all three methods.
1041  * The first two methods use the kbd_state structure. The third uses SMBIOS
1042  * tokens. If kbd_info.levels == 0, the machine does not support setting the
1043  * keyboard backlight level via kbd_state.level.
1044  */
1045
1046 static int kbd_get_info(struct kbd_info *info)
1047 {
1048         u8 units;
1049         int ret;
1050
1051         get_buffer();
1052
1053         buffer->input[0] = 0x0;
1054         dell_send_request(buffer, 4, 11);
1055         ret = buffer->output[0];
1056
1057         if (ret) {
1058                 ret = dell_smi_error(ret);
1059                 goto out;
1060         }
1061
1062         info->modes = buffer->output[1] & 0xFFFF;
1063         info->type = (buffer->output[1] >> 24) & 0xFF;
1064         info->triggers = buffer->output[2] & 0xFF;
1065         units = (buffer->output[2] >> 8) & 0xFF;
1066         info->levels = (buffer->output[2] >> 16) & 0xFF;
1067
1068         if (units & BIT(0))
1069                 info->seconds = (buffer->output[3] >> 0) & 0xFF;
1070         if (units & BIT(1))
1071                 info->minutes = (buffer->output[3] >> 8) & 0xFF;
1072         if (units & BIT(2))
1073                 info->hours = (buffer->output[3] >> 16) & 0xFF;
1074         if (units & BIT(3))
1075                 info->days = (buffer->output[3] >> 24) & 0xFF;
1076
1077  out:
1078         release_buffer();
1079         return ret;
1080 }
1081
1082 static unsigned int kbd_get_max_level(void)
1083 {
1084         if (kbd_info.levels != 0)
1085                 return kbd_info.levels;
1086         if (kbd_mode_levels_count > 0)
1087                 return kbd_mode_levels_count - 1;
1088         return 0;
1089 }
1090
1091 static int kbd_get_level(struct kbd_state *state)
1092 {
1093         int i;
1094
1095         if (kbd_info.levels != 0)
1096                 return state->level;
1097
1098         if (kbd_mode_levels_count > 0) {
1099                 for (i = 0; i < kbd_mode_levels_count; ++i)
1100                         if (kbd_mode_levels[i] == state->mode_bit)
1101                                 return i;
1102                 return 0;
1103         }
1104
1105         return -EINVAL;
1106 }
1107
1108 static int kbd_set_level(struct kbd_state *state, u8 level)
1109 {
1110         if (kbd_info.levels != 0) {
1111                 if (level != 0)
1112                         kbd_previous_level = level;
1113                 if (state->level == level)
1114                         return 0;
1115                 state->level = level;
1116                 if (level != 0 && state->mode_bit == KBD_MODE_BIT_OFF)
1117                         state->mode_bit = kbd_previous_mode_bit;
1118                 else if (level == 0 && state->mode_bit != KBD_MODE_BIT_OFF) {
1119                         kbd_previous_mode_bit = state->mode_bit;
1120                         state->mode_bit = KBD_MODE_BIT_OFF;
1121                 }
1122                 return 0;
1123         }
1124
1125         if (kbd_mode_levels_count > 0 && level < kbd_mode_levels_count) {
1126                 if (level != 0)
1127                         kbd_previous_level = level;
1128                 state->mode_bit = kbd_mode_levels[level];
1129                 return 0;
1130         }
1131
1132         return -EINVAL;
1133 }
1134
1135 static int kbd_get_state(struct kbd_state *state)
1136 {
1137         int ret;
1138
1139         get_buffer();
1140
1141         buffer->input[0] = 0x1;
1142         dell_send_request(buffer, 4, 11);
1143         ret = buffer->output[0];
1144
1145         if (ret) {
1146                 ret = dell_smi_error(ret);
1147                 goto out;
1148         }
1149
1150         state->mode_bit = ffs(buffer->output[1] & 0xFFFF);
1151         if (state->mode_bit != 0)
1152                 state->mode_bit--;
1153
1154         state->triggers = (buffer->output[1] >> 16) & 0xFF;
1155         state->timeout_value = (buffer->output[1] >> 24) & 0x3F;
1156         state->timeout_unit = (buffer->output[1] >> 30) & 0x3;
1157         state->als_setting = buffer->output[2] & 0xFF;
1158         state->als_value = (buffer->output[2] >> 8) & 0xFF;
1159         state->level = (buffer->output[2] >> 16) & 0xFF;
1160
1161  out:
1162         release_buffer();
1163         return ret;
1164 }
1165
1166 static int kbd_set_state(struct kbd_state *state)
1167 {
1168         int ret;
1169
1170         get_buffer();
1171         buffer->input[0] = 0x2;
1172         buffer->input[1] = BIT(state->mode_bit) & 0xFFFF;
1173         buffer->input[1] |= (state->triggers & 0xFF) << 16;
1174         buffer->input[1] |= (state->timeout_value & 0x3F) << 24;
1175         buffer->input[1] |= (state->timeout_unit & 0x3) << 30;
1176         buffer->input[2] = state->als_setting & 0xFF;
1177         buffer->input[2] |= (state->level & 0xFF) << 16;
1178         dell_send_request(buffer, 4, 11);
1179         ret = buffer->output[0];
1180         release_buffer();
1181
1182         return dell_smi_error(ret);
1183 }
1184
1185 static int kbd_set_state_safe(struct kbd_state *state, struct kbd_state *old)
1186 {
1187         int ret;
1188
1189         ret = kbd_set_state(state);
1190         if (ret == 0)
1191                 return 0;
1192
1193         /*
1194          * When setting the new state fails,try to restore the previous one.
1195          * This is needed on some machines where BIOS sets a default state when
1196          * setting a new state fails. This default state could be all off.
1197          */
1198
1199         if (kbd_set_state(old))
1200                 pr_err("Setting old previous keyboard state failed\n");
1201
1202         return ret;
1203 }
1204
1205 static int kbd_set_token_bit(u8 bit)
1206 {
1207         int id;
1208         int ret;
1209
1210         if (bit >= ARRAY_SIZE(kbd_tokens))
1211                 return -EINVAL;
1212
1213         id = find_token_id(kbd_tokens[bit]);
1214         if (id == -1)
1215                 return -EINVAL;
1216
1217         get_buffer();
1218         buffer->input[0] = da_tokens[id].location;
1219         buffer->input[1] = da_tokens[id].value;
1220         dell_send_request(buffer, 1, 0);
1221         ret = buffer->output[0];
1222         release_buffer();
1223
1224         return dell_smi_error(ret);
1225 }
1226
1227 static int kbd_get_token_bit(u8 bit)
1228 {
1229         int id;
1230         int ret;
1231         int val;
1232
1233         if (bit >= ARRAY_SIZE(kbd_tokens))
1234                 return -EINVAL;
1235
1236         id = find_token_id(kbd_tokens[bit]);
1237         if (id == -1)
1238                 return -EINVAL;
1239
1240         get_buffer();
1241         buffer->input[0] = da_tokens[id].location;
1242         dell_send_request(buffer, 0, 0);
1243         ret = buffer->output[0];
1244         val = buffer->output[1];
1245         release_buffer();
1246
1247         if (ret)
1248                 return dell_smi_error(ret);
1249
1250         return (val == da_tokens[id].value);
1251 }
1252
1253 static int kbd_get_first_active_token_bit(void)
1254 {
1255         int i;
1256         int ret;
1257
1258         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i) {
1259                 ret = kbd_get_token_bit(i);
1260                 if (ret == 1)
1261                         return i;
1262         }
1263
1264         return ret;
1265 }
1266
1267 static int kbd_get_valid_token_counts(void)
1268 {
1269         return hweight16(kbd_token_bits);
1270 }
1271
1272 static inline int kbd_init_info(void)
1273 {
1274         struct kbd_state state;
1275         int ret;
1276         int i;
1277
1278         ret = kbd_get_info(&kbd_info);
1279         if (ret)
1280                 return ret;
1281
1282         kbd_get_state(&state);
1283
1284         /* NOTE: timeout value is stored in 6 bits so max value is 63 */
1285         if (kbd_info.seconds > 63)
1286                 kbd_info.seconds = 63;
1287         if (kbd_info.minutes > 63)
1288                 kbd_info.minutes = 63;
1289         if (kbd_info.hours > 63)
1290                 kbd_info.hours = 63;
1291         if (kbd_info.days > 63)
1292                 kbd_info.days = 63;
1293
1294         /* NOTE: On tested machines ON mode did not work and caused
1295          *       problems (turned backlight off) so do not use it
1296          */
1297         kbd_info.modes &= ~BIT(KBD_MODE_BIT_ON);
1298
1299         kbd_previous_level = kbd_get_level(&state);
1300         kbd_previous_mode_bit = state.mode_bit;
1301
1302         if (kbd_previous_level == 0 && kbd_get_max_level() != 0)
1303                 kbd_previous_level = 1;
1304
1305         if (kbd_previous_mode_bit == KBD_MODE_BIT_OFF) {
1306                 kbd_previous_mode_bit =
1307                         ffs(kbd_info.modes & ~BIT(KBD_MODE_BIT_OFF));
1308                 if (kbd_previous_mode_bit != 0)
1309                         kbd_previous_mode_bit--;
1310         }
1311
1312         if (kbd_info.modes & (BIT(KBD_MODE_BIT_ALS) |
1313                               BIT(KBD_MODE_BIT_TRIGGER_ALS)))
1314                 kbd_als_supported = true;
1315
1316         if (kbd_info.modes & (
1317             BIT(KBD_MODE_BIT_TRIGGER_ALS) | BIT(KBD_MODE_BIT_TRIGGER) |
1318             BIT(KBD_MODE_BIT_TRIGGER_25) | BIT(KBD_MODE_BIT_TRIGGER_50) |
1319             BIT(KBD_MODE_BIT_TRIGGER_75) | BIT(KBD_MODE_BIT_TRIGGER_100)
1320            ))
1321                 kbd_triggers_supported = true;
1322
1323         /* kbd_mode_levels[0] is reserved, see below */
1324         for (i = 0; i < 16; ++i)
1325                 if (kbd_is_level_mode_bit(i) && (BIT(i) & kbd_info.modes))
1326                         kbd_mode_levels[1 + kbd_mode_levels_count++] = i;
1327
1328         /*
1329          * Find the first supported mode and assign to kbd_mode_levels[0].
1330          * This should be 0 (off), but we cannot depend on the BIOS to
1331          * support 0.
1332          */
1333         if (kbd_mode_levels_count > 0) {
1334                 for (i = 0; i < 16; ++i) {
1335                         if (BIT(i) & kbd_info.modes) {
1336                                 kbd_mode_levels[0] = i;
1337                                 break;
1338                         }
1339                 }
1340                 kbd_mode_levels_count++;
1341         }
1342
1343         return 0;
1344
1345 }
1346
1347 static inline void kbd_init_tokens(void)
1348 {
1349         int i;
1350
1351         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i)
1352                 if (find_token_id(kbd_tokens[i]) != -1)
1353                         kbd_token_bits |= BIT(i);
1354 }
1355
1356 static void kbd_init(void)
1357 {
1358         int ret;
1359
1360         ret = kbd_init_info();
1361         kbd_init_tokens();
1362
1363         if (kbd_token_bits != 0 || ret == 0)
1364                 kbd_led_present = true;
1365 }
1366
1367 static ssize_t kbd_led_timeout_store(struct device *dev,
1368                                      struct device_attribute *attr,
1369                                      const char *buf, size_t count)
1370 {
1371         struct kbd_state new_state;
1372         struct kbd_state state;
1373         bool convert;
1374         int value;
1375         int ret;
1376         char ch;
1377         u8 unit;
1378         int i;
1379
1380         ret = sscanf(buf, "%d %c", &value, &ch);
1381         if (ret < 1)
1382                 return -EINVAL;
1383         else if (ret == 1)
1384                 ch = 's';
1385
1386         if (value < 0)
1387                 return -EINVAL;
1388
1389         convert = false;
1390
1391         switch (ch) {
1392         case 's':
1393                 if (value > kbd_info.seconds)
1394                         convert = true;
1395                 unit = KBD_TIMEOUT_SECONDS;
1396                 break;
1397         case 'm':
1398                 if (value > kbd_info.minutes)
1399                         convert = true;
1400                 unit = KBD_TIMEOUT_MINUTES;
1401                 break;
1402         case 'h':
1403                 if (value > kbd_info.hours)
1404                         convert = true;
1405                 unit = KBD_TIMEOUT_HOURS;
1406                 break;
1407         case 'd':
1408                 if (value > kbd_info.days)
1409                         convert = true;
1410                 unit = KBD_TIMEOUT_DAYS;
1411                 break;
1412         default:
1413                 return -EINVAL;
1414         }
1415
1416         if (quirks && quirks->needs_kbd_timeouts)
1417                 convert = true;
1418
1419         if (convert) {
1420                 /* Convert value from current units to seconds */
1421                 switch (unit) {
1422                 case KBD_TIMEOUT_DAYS:
1423                         value *= 24;
1424                 case KBD_TIMEOUT_HOURS:
1425                         value *= 60;
1426                 case KBD_TIMEOUT_MINUTES:
1427                         value *= 60;
1428                         unit = KBD_TIMEOUT_SECONDS;
1429                 }
1430
1431                 if (quirks && quirks->needs_kbd_timeouts) {
1432                         for (i = 0; quirks->kbd_timeouts[i] != -1; i++) {
1433                                 if (value <= quirks->kbd_timeouts[i]) {
1434                                         value = quirks->kbd_timeouts[i];
1435                                         break;
1436                                 }
1437                         }
1438                 }
1439
1440                 if (value <= kbd_info.seconds && kbd_info.seconds) {
1441                         unit = KBD_TIMEOUT_SECONDS;
1442                 } else if (value / 60 <= kbd_info.minutes && kbd_info.minutes) {
1443                         value /= 60;
1444                         unit = KBD_TIMEOUT_MINUTES;
1445                 } else if (value / (60 * 60) <= kbd_info.hours && kbd_info.hours) {
1446                         value /= (60 * 60);
1447                         unit = KBD_TIMEOUT_HOURS;
1448                 } else if (value / (60 * 60 * 24) <= kbd_info.days && kbd_info.days) {
1449                         value /= (60 * 60 * 24);
1450                         unit = KBD_TIMEOUT_DAYS;
1451                 } else {
1452                         return -EINVAL;
1453                 }
1454         }
1455
1456         ret = kbd_get_state(&state);
1457         if (ret)
1458                 return ret;
1459
1460         new_state = state;
1461         new_state.timeout_value = value;
1462         new_state.timeout_unit = unit;
1463
1464         ret = kbd_set_state_safe(&new_state, &state);
1465         if (ret)
1466                 return ret;
1467
1468         return count;
1469 }
1470
1471 static ssize_t kbd_led_timeout_show(struct device *dev,
1472                                     struct device_attribute *attr, char *buf)
1473 {
1474         struct kbd_state state;
1475         int ret;
1476         int len;
1477
1478         ret = kbd_get_state(&state);
1479         if (ret)
1480                 return ret;
1481
1482         len = sprintf(buf, "%d", state.timeout_value);
1483
1484         switch (state.timeout_unit) {
1485         case KBD_TIMEOUT_SECONDS:
1486                 return len + sprintf(buf+len, "s\n");
1487         case KBD_TIMEOUT_MINUTES:
1488                 return len + sprintf(buf+len, "m\n");
1489         case KBD_TIMEOUT_HOURS:
1490                 return len + sprintf(buf+len, "h\n");
1491         case KBD_TIMEOUT_DAYS:
1492                 return len + sprintf(buf+len, "d\n");
1493         default:
1494                 return -EINVAL;
1495         }
1496
1497         return len;
1498 }
1499
1500 static DEVICE_ATTR(stop_timeout, S_IRUGO | S_IWUSR,
1501                    kbd_led_timeout_show, kbd_led_timeout_store);
1502
1503 static const char * const kbd_led_triggers[] = {
1504         "keyboard",
1505         "touchpad",
1506         /*"trackstick"*/ NULL, /* NOTE: trackstick is just alias for touchpad */
1507         "mouse",
1508 };
1509
1510 static ssize_t kbd_led_triggers_store(struct device *dev,
1511                                       struct device_attribute *attr,
1512                                       const char *buf, size_t count)
1513 {
1514         struct kbd_state new_state;
1515         struct kbd_state state;
1516         bool triggers_enabled = false;
1517         int trigger_bit = -1;
1518         char trigger[21];
1519         int i, ret;
1520
1521         ret = sscanf(buf, "%20s", trigger);
1522         if (ret != 1)
1523                 return -EINVAL;
1524
1525         if (trigger[0] != '+' && trigger[0] != '-')
1526                 return -EINVAL;
1527
1528         ret = kbd_get_state(&state);
1529         if (ret)
1530                 return ret;
1531
1532         if (kbd_triggers_supported)
1533                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1534
1535         if (kbd_triggers_supported) {
1536                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1537                         if (!(kbd_info.triggers & BIT(i)))
1538                                 continue;
1539                         if (!kbd_led_triggers[i])
1540                                 continue;
1541                         if (strcmp(trigger+1, kbd_led_triggers[i]) != 0)
1542                                 continue;
1543                         if (trigger[0] == '+' &&
1544                             triggers_enabled && (state.triggers & BIT(i)))
1545                                 return count;
1546                         if (trigger[0] == '-' &&
1547                             (!triggers_enabled || !(state.triggers & BIT(i))))
1548                                 return count;
1549                         trigger_bit = i;
1550                         break;
1551                 }
1552         }
1553
1554         if (trigger_bit != -1) {
1555                 new_state = state;
1556                 if (trigger[0] == '+')
1557                         new_state.triggers |= BIT(trigger_bit);
1558                 else {
1559                         new_state.triggers &= ~BIT(trigger_bit);
1560                         /* NOTE: trackstick bit (2) must be disabled when
1561                          *       disabling touchpad bit (1), otherwise touchpad
1562                          *       bit (1) will not be disabled */
1563                         if (trigger_bit == 1)
1564                                 new_state.triggers &= ~BIT(2);
1565                 }
1566                 if ((kbd_info.triggers & new_state.triggers) !=
1567                     new_state.triggers)
1568                         return -EINVAL;
1569                 if (new_state.triggers && !triggers_enabled) {
1570                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1571                         kbd_set_level(&new_state, kbd_previous_level);
1572                 } else if (new_state.triggers == 0) {
1573                         kbd_set_level(&new_state, 0);
1574                 }
1575                 if (!(kbd_info.modes & BIT(new_state.mode_bit)))
1576                         return -EINVAL;
1577                 ret = kbd_set_state_safe(&new_state, &state);
1578                 if (ret)
1579                         return ret;
1580                 if (new_state.mode_bit != KBD_MODE_BIT_OFF)
1581                         kbd_previous_mode_bit = new_state.mode_bit;
1582                 return count;
1583         }
1584
1585         return -EINVAL;
1586 }
1587
1588 static ssize_t kbd_led_triggers_show(struct device *dev,
1589                                      struct device_attribute *attr, char *buf)
1590 {
1591         struct kbd_state state;
1592         bool triggers_enabled;
1593         int level, i, ret;
1594         int len = 0;
1595
1596         ret = kbd_get_state(&state);
1597         if (ret)
1598                 return ret;
1599
1600         len = 0;
1601
1602         if (kbd_triggers_supported) {
1603                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1604                 level = kbd_get_level(&state);
1605                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1606                         if (!(kbd_info.triggers & BIT(i)))
1607                                 continue;
1608                         if (!kbd_led_triggers[i])
1609                                 continue;
1610                         if ((triggers_enabled || level <= 0) &&
1611                             (state.triggers & BIT(i)))
1612                                 buf[len++] = '+';
1613                         else
1614                                 buf[len++] = '-';
1615                         len += sprintf(buf+len, "%s ", kbd_led_triggers[i]);
1616                 }
1617         }
1618
1619         if (len)
1620                 buf[len - 1] = '\n';
1621
1622         return len;
1623 }
1624
1625 static DEVICE_ATTR(start_triggers, S_IRUGO | S_IWUSR,
1626                    kbd_led_triggers_show, kbd_led_triggers_store);
1627
1628 static ssize_t kbd_led_als_enabled_store(struct device *dev,
1629                                          struct device_attribute *attr,
1630                                          const char *buf, size_t count)
1631 {
1632         struct kbd_state new_state;
1633         struct kbd_state state;
1634         bool triggers_enabled = false;
1635         int enable;
1636         int ret;
1637
1638         ret = kstrtoint(buf, 0, &enable);
1639         if (ret)
1640                 return ret;
1641
1642         ret = kbd_get_state(&state);
1643         if (ret)
1644                 return ret;
1645
1646         if (enable == kbd_is_als_mode_bit(state.mode_bit))
1647                 return count;
1648
1649         new_state = state;
1650
1651         if (kbd_triggers_supported)
1652                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1653
1654         if (enable) {
1655                 if (triggers_enabled)
1656                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER_ALS;
1657                 else
1658                         new_state.mode_bit = KBD_MODE_BIT_ALS;
1659         } else {
1660                 if (triggers_enabled) {
1661                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1662                         kbd_set_level(&new_state, kbd_previous_level);
1663                 } else {
1664                         new_state.mode_bit = KBD_MODE_BIT_ON;
1665                 }
1666         }
1667         if (!(kbd_info.modes & BIT(new_state.mode_bit)))
1668                 return -EINVAL;
1669
1670         ret = kbd_set_state_safe(&new_state, &state);
1671         if (ret)
1672                 return ret;
1673         kbd_previous_mode_bit = new_state.mode_bit;
1674
1675         return count;
1676 }
1677
1678 static ssize_t kbd_led_als_enabled_show(struct device *dev,
1679                                         struct device_attribute *attr,
1680                                         char *buf)
1681 {
1682         struct kbd_state state;
1683         bool enabled = false;
1684         int ret;
1685
1686         ret = kbd_get_state(&state);
1687         if (ret)
1688                 return ret;
1689         enabled = kbd_is_als_mode_bit(state.mode_bit);
1690
1691         return sprintf(buf, "%d\n", enabled ? 1 : 0);
1692 }
1693
1694 static DEVICE_ATTR(als_enabled, S_IRUGO | S_IWUSR,
1695                    kbd_led_als_enabled_show, kbd_led_als_enabled_store);
1696
1697 static ssize_t kbd_led_als_setting_store(struct device *dev,
1698                                          struct device_attribute *attr,
1699                                          const char *buf, size_t count)
1700 {
1701         struct kbd_state state;
1702         struct kbd_state new_state;
1703         u8 setting;
1704         int ret;
1705
1706         ret = kstrtou8(buf, 10, &setting);
1707         if (ret)
1708                 return ret;
1709
1710         ret = kbd_get_state(&state);
1711         if (ret)
1712                 return ret;
1713
1714         new_state = state;
1715         new_state.als_setting = setting;
1716
1717         ret = kbd_set_state_safe(&new_state, &state);
1718         if (ret)
1719                 return ret;
1720
1721         return count;
1722 }
1723
1724 static ssize_t kbd_led_als_setting_show(struct device *dev,
1725                                         struct device_attribute *attr,
1726                                         char *buf)
1727 {
1728         struct kbd_state state;
1729         int ret;
1730
1731         ret = kbd_get_state(&state);
1732         if (ret)
1733                 return ret;
1734
1735         return sprintf(buf, "%d\n", state.als_setting);
1736 }
1737
1738 static DEVICE_ATTR(als_setting, S_IRUGO | S_IWUSR,
1739                    kbd_led_als_setting_show, kbd_led_als_setting_store);
1740
1741 static struct attribute *kbd_led_attrs[] = {
1742         &dev_attr_stop_timeout.attr,
1743         &dev_attr_start_triggers.attr,
1744         NULL,
1745 };
1746
1747 static const struct attribute_group kbd_led_group = {
1748         .attrs = kbd_led_attrs,
1749 };
1750
1751 static struct attribute *kbd_led_als_attrs[] = {
1752         &dev_attr_als_enabled.attr,
1753         &dev_attr_als_setting.attr,
1754         NULL,
1755 };
1756
1757 static const struct attribute_group kbd_led_als_group = {
1758         .attrs = kbd_led_als_attrs,
1759 };
1760
1761 static const struct attribute_group *kbd_led_groups[] = {
1762         &kbd_led_group,
1763         &kbd_led_als_group,
1764         NULL,
1765 };
1766
1767 static enum led_brightness kbd_led_level_get(struct led_classdev *led_cdev)
1768 {
1769         int ret;
1770         u16 num;
1771         struct kbd_state state;
1772
1773         if (kbd_get_max_level()) {
1774                 ret = kbd_get_state(&state);
1775                 if (ret)
1776                         return 0;
1777                 ret = kbd_get_level(&state);
1778                 if (ret < 0)
1779                         return 0;
1780                 return ret;
1781         }
1782
1783         if (kbd_get_valid_token_counts()) {
1784                 ret = kbd_get_first_active_token_bit();
1785                 if (ret < 0)
1786                         return 0;
1787                 for (num = kbd_token_bits; num != 0 && ret > 0; --ret)
1788                         num &= num - 1; /* clear the first bit set */
1789                 if (num == 0)
1790                         return 0;
1791                 return ffs(num) - 1;
1792         }
1793
1794         pr_warn("Keyboard brightness level control not supported\n");
1795         return 0;
1796 }
1797
1798 static void kbd_led_level_set(struct led_classdev *led_cdev,
1799                               enum led_brightness value)
1800 {
1801         struct kbd_state state;
1802         struct kbd_state new_state;
1803         u16 num;
1804
1805         if (kbd_get_max_level()) {
1806                 if (kbd_get_state(&state))
1807                         return;
1808                 new_state = state;
1809                 if (kbd_set_level(&new_state, value))
1810                         return;
1811                 kbd_set_state_safe(&new_state, &state);
1812                 return;
1813         }
1814
1815         if (kbd_get_valid_token_counts()) {
1816                 for (num = kbd_token_bits; num != 0 && value > 0; --value)
1817                         num &= num - 1; /* clear the first bit set */
1818                 if (num == 0)
1819                         return;
1820                 kbd_set_token_bit(ffs(num) - 1);
1821                 return;
1822         }
1823
1824         pr_warn("Keyboard brightness level control not supported\n");
1825 }
1826
1827 static struct led_classdev kbd_led = {
1828         .name           = "dell::kbd_backlight",
1829         .brightness_set = kbd_led_level_set,
1830         .brightness_get = kbd_led_level_get,
1831         .groups         = kbd_led_groups,
1832 };
1833
1834 static int __init kbd_led_init(struct device *dev)
1835 {
1836         kbd_init();
1837         if (!kbd_led_present)
1838                 return -ENODEV;
1839         if (!kbd_als_supported)
1840                 kbd_led_groups[1] = NULL;
1841         kbd_led.max_brightness = kbd_get_max_level();
1842         if (!kbd_led.max_brightness) {
1843                 kbd_led.max_brightness = kbd_get_valid_token_counts();
1844                 if (kbd_led.max_brightness)
1845                         kbd_led.max_brightness--;
1846         }
1847         return led_classdev_register(dev, &kbd_led);
1848 }
1849
1850 static void brightness_set_exit(struct led_classdev *led_cdev,
1851                                 enum led_brightness value)
1852 {
1853         /* Don't change backlight level on exit */
1854 };
1855
1856 static void kbd_led_exit(void)
1857 {
1858         if (!kbd_led_present)
1859                 return;
1860         kbd_led.brightness_set = brightness_set_exit;
1861         led_classdev_unregister(&kbd_led);
1862 }
1863
1864 static int __init dell_init(void)
1865 {
1866         int max_intensity = 0;
1867         int ret;
1868
1869         if (!dmi_check_system(dell_device_table))
1870                 return -ENODEV;
1871
1872         quirks = NULL;
1873         /* find if this machine support other functions */
1874         dmi_check_system(dell_quirks);
1875
1876         dmi_walk(find_tokens, NULL);
1877
1878         if (!da_tokens)  {
1879                 pr_info("Unable to find dmi tokens\n");
1880                 return -ENODEV;
1881         }
1882
1883         ret = platform_driver_register(&platform_driver);
1884         if (ret)
1885                 goto fail_platform_driver;
1886         platform_device = platform_device_alloc("dell-laptop", -1);
1887         if (!platform_device) {
1888                 ret = -ENOMEM;
1889                 goto fail_platform_device1;
1890         }
1891         ret = platform_device_add(platform_device);
1892         if (ret)
1893                 goto fail_platform_device2;
1894
1895         /*
1896          * Allocate buffer below 4GB for SMI data--only 32-bit physical addr
1897          * is passed to SMI handler.
1898          */
1899         bufferpage = alloc_page(GFP_KERNEL | GFP_DMA32);
1900         if (!bufferpage) {
1901                 ret = -ENOMEM;
1902                 goto fail_buffer;
1903         }
1904         buffer = page_address(bufferpage);
1905
1906         ret = dell_setup_rfkill();
1907
1908         if (ret) {
1909                 pr_warn("Unable to setup rfkill\n");
1910                 goto fail_rfkill;
1911         }
1912
1913         if (quirks && quirks->touchpad_led)
1914                 touchpad_led_init(&platform_device->dev);
1915
1916         kbd_led_init(&platform_device->dev);
1917
1918         dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
1919         if (dell_laptop_dir != NULL)
1920                 debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
1921                                     &dell_debugfs_fops);
1922
1923 #ifdef CONFIG_ACPI
1924         /* In the event of an ACPI backlight being available, don't
1925          * register the platform controller.
1926          */
1927         if (acpi_video_backlight_support())
1928                 return 0;
1929 #endif
1930
1931         get_buffer();
1932         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
1933         if (buffer->input[0] != -1) {
1934                 dell_send_request(buffer, 0, 2);
1935                 max_intensity = buffer->output[3];
1936         }
1937         release_buffer();
1938
1939         if (max_intensity) {
1940                 struct backlight_properties props;
1941                 memset(&props, 0, sizeof(struct backlight_properties));
1942                 props.type = BACKLIGHT_PLATFORM;
1943                 props.max_brightness = max_intensity;
1944                 dell_backlight_device = backlight_device_register("dell_backlight",
1945                                                                   &platform_device->dev,
1946                                                                   NULL,
1947                                                                   &dell_ops,
1948                                                                   &props);
1949
1950                 if (IS_ERR(dell_backlight_device)) {
1951                         ret = PTR_ERR(dell_backlight_device);
1952                         dell_backlight_device = NULL;
1953                         goto fail_backlight;
1954                 }
1955
1956                 dell_backlight_device->props.brightness =
1957                         dell_get_intensity(dell_backlight_device);
1958                 backlight_update_status(dell_backlight_device);
1959         }
1960
1961         return 0;
1962
1963 fail_backlight:
1964         i8042_remove_filter(dell_laptop_i8042_filter);
1965         cancel_delayed_work_sync(&dell_rfkill_work);
1966         dell_cleanup_rfkill();
1967 fail_rfkill:
1968         free_page((unsigned long)bufferpage);
1969 fail_buffer:
1970         platform_device_del(platform_device);
1971 fail_platform_device2:
1972         platform_device_put(platform_device);
1973 fail_platform_device1:
1974         platform_driver_unregister(&platform_driver);
1975 fail_platform_driver:
1976         kfree(da_tokens);
1977         return ret;
1978 }
1979
1980 static void __exit dell_exit(void)
1981 {
1982         debugfs_remove_recursive(dell_laptop_dir);
1983         if (quirks && quirks->touchpad_led)
1984                 touchpad_led_exit();
1985         kbd_led_exit();
1986         i8042_remove_filter(dell_laptop_i8042_filter);
1987         cancel_delayed_work_sync(&dell_rfkill_work);
1988         backlight_device_unregister(dell_backlight_device);
1989         dell_cleanup_rfkill();
1990         if (platform_device) {
1991                 platform_device_unregister(platform_device);
1992                 platform_driver_unregister(&platform_driver);
1993         }
1994         kfree(da_tokens);
1995         free_page((unsigned long)buffer);
1996 }
1997
1998 module_init(dell_init);
1999 module_exit(dell_exit);
2000
2001 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
2002 MODULE_AUTHOR("Gabriele Mazzotta <gabriele.mzt@gmail.com>");
2003 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
2004 MODULE_DESCRIPTION("Dell laptop driver");
2005 MODULE_LICENSE("GPL");