drivers/platform/x86/dell-laptop.c

   1 /*
   2  *  Driver for Dell laptop extras
   3  *
   4  *  Copyright (c) Red Hat <mjg@redhat.com>
   5  *
   6  *  Based on documentation in the libsmbios package, Copyright (C) 2005 Dell
   7  *  Inc.
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License version 2 as
  11  *  published by the Free Software Foundation.
  12  */
  13
  14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  15
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/backlight.h>
  21 #include <linux/err.h>
  22 #include <linux/dmi.h>
  23 #include <linux/io.h>
  24 #include <linux/rfkill.h>
  25 #include <linux/power_supply.h>
  26 #include <linux/acpi.h>
  27 #include <linux/mm.h>
  28 #include <linux/i8042.h>
  29 #include <linux/slab.h>
  30 #include <linux/debugfs.h>
  31 #include <linux/seq_file.h>
  32 #include "../../firmware/dcdbas.h"
  33
  34 #define BRIGHTNESS_TOKEN 0x7d
  35
  36 /* This structure will be modified by the firmware when we enter
  37  * system management mode, hence the volatiles */
  38
  39 struct calling_interface_buffer {
  40         u16 class;
  41         u16 select;
  42         volatile u32 input[4];
  43         volatile u32 output[4];
  44 } __packed;
  45
  46 struct calling_interface_token {
  47         u16 tokenID;
  48         u16 location;
  49         union {
  50                 u16 value;
  51                 u16 stringlength;
  52         };
  53 };
  54
  55 struct calling_interface_structure {
  56         struct dmi_header header;
  57         u16 cmdIOAddress;
  58         u8 cmdIOCode;
  59         u32 supportedCmds;
  60         struct calling_interface_token tokens[];
  61 } __packed;
  62
  63 struct quirk_entry {
  64         u8 touchpad_led;
  65 };
  66
  67 static struct quirk_entry *quirks;
  68
  69 static struct quirk_entry quirk_dell_vostro_v130 = {
  70         .touchpad_led = 1,
  71 };
  72
  73 static int dmi_matched(const struct dmi_system_id *dmi)
  74 {
  75         quirks = dmi->driver_data;
  76         return 1;
  77 }
  78
  79 static int da_command_address;
  80 static int da_command_code;
  81 static int da_num_tokens;
  82 static struct calling_interface_token *da_tokens;
  83
  84 static struct platform_driver platform_driver = {
  85         .driver = {
  86                 .name = "dell-laptop",
  87                 .owner = THIS_MODULE,
  88         }
  89 };
  90
  91 static struct platform_device *platform_device;
  92 static struct backlight_device *dell_backlight_device;
  93 static struct rfkill *wifi_rfkill;
  94 static struct rfkill *bluetooth_rfkill;
  95 static struct rfkill *wwan_rfkill;
  96 static bool force_rfkill;
  97
  98 module_param(force_rfkill, bool, 0444);
  99 MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
 100
 101 static const struct dmi_system_id dell_device_table[] __initconst = {
 102         {
 103                 .ident = "Dell laptop",
 104                 .matches = {
 105                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 106                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 107                 },
 108         },
 109         {
 110                 .matches = {
 111                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 112                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
 113                 },
 114         },
 115         {
 116                 .ident = "Dell Computer Corporation",
 117                 .matches = {
 118                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 119                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 120                 },
 121         },
 122         { }
 123 };
 124 MODULE_DEVICE_TABLE(dmi, dell_device_table);
 125
 126 static struct dmi_system_id dell_quirks[] = {
 127         {
 128                 .callback = dmi_matched,
 129                 .ident = "Dell Vostro V130",
 130                 .matches = {
 131                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 132                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
 133                 },
 134                 .driver_data = &quirk_dell_vostro_v130,
 135         },
 136         {
 137                 .callback = dmi_matched,
 138                 .ident = "Dell Vostro V131",
 139                 .matches = {
 140                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 141                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 142                 },
 143                 .driver_data = &quirk_dell_vostro_v130,
 144         },
 145         {
 146                 .callback = dmi_matched,
 147                 .ident = "Dell Vostro 3350",
 148                 .matches = {
 149                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 150                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
 151                 },
 152                 .driver_data = &quirk_dell_vostro_v130,
 153         },
 154         {
 155                 .callback = dmi_matched,
 156                 .ident = "Dell Vostro 3555",
 157                 .matches = {
 158                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 159                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
 160                 },
 161                 .driver_data = &quirk_dell_vostro_v130,
 162         },
 163         {
 164                 .callback = dmi_matched,
 165                 .ident = "Dell Inspiron N311z",
 166                 .matches = {
 167                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 168                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
 169                 },
 170                 .driver_data = &quirk_dell_vostro_v130,
 171         },
 172         {
 173                 .callback = dmi_matched,
 174                 .ident = "Dell Inspiron M5110",
 175                 .matches = {
 176                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 177                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
 178                 },
 179                 .driver_data = &quirk_dell_vostro_v130,
 180         },
 181         {
 182                 .callback = dmi_matched,
 183                 .ident = "Dell Vostro 3360",
 184                 .matches = {
 185                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 186                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
 187                 },
 188                 .driver_data = &quirk_dell_vostro_v130,
 189         },
 190         {
 191                 .callback = dmi_matched,
 192                 .ident = "Dell Vostro 3460",
 193                 .matches = {
 194                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 195                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"),
 196                 },
 197                 .driver_data = &quirk_dell_vostro_v130,
 198         },
 199         {
 200                 .callback = dmi_matched,
 201                 .ident = "Dell Vostro 3560",
 202                 .matches = {
 203                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 204                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"),
 205                 },
 206                 .driver_data = &quirk_dell_vostro_v130,
 207         },
 208         {
 209                 .callback = dmi_matched,
 210                 .ident = "Dell Vostro 3450",
 211                 .matches = {
 212                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 213                         DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"),
 214                 },
 215                 .driver_data = &quirk_dell_vostro_v130,
 216         },
 217         {
 218                 .callback = dmi_matched,
 219                 .ident = "Dell Inspiron 5420",
 220                 .matches = {
 221                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 222                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"),
 223                 },
 224                 .driver_data = &quirk_dell_vostro_v130,
 225         },
 226         {
 227                 .callback = dmi_matched,
 228                 .ident = "Dell Inspiron 5520",
 229                 .matches = {
 230                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 231                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"),
 232                 },
 233                 .driver_data = &quirk_dell_vostro_v130,
 234         },
 235         {
 236                 .callback = dmi_matched,
 237                 .ident = "Dell Inspiron 5720",
 238                 .matches = {
 239                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 240                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"),
 241                 },
 242                 .driver_data = &quirk_dell_vostro_v130,
 243         },
 244         {
 245                 .callback = dmi_matched,
 246                 .ident = "Dell Inspiron 7420",
 247                 .matches = {
 248                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 249                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"),
 250                 },
 251                 .driver_data = &quirk_dell_vostro_v130,
 252         },
 253         {
 254                 .callback = dmi_matched,
 255                 .ident = "Dell Inspiron 7520",
 256                 .matches = {
 257                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 258                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
 259                 },
 260                 .driver_data = &quirk_dell_vostro_v130,
 261         },
 262         {
 263                 .callback = dmi_matched,
 264                 .ident = "Dell Inspiron 7720",
 265                 .matches = {
 266                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 267                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
 268                 },
 269                 .driver_data = &quirk_dell_vostro_v130,
 270         },
 271         { }
 272 };
 273
 274 static struct calling_interface_buffer *buffer;
 275 static DEFINE_MUTEX(buffer_mutex);
 276
 277 static int hwswitch_state;
 278
 279 static void get_buffer(void)
 280 {
 281         mutex_lock(&buffer_mutex);
 282         memset(buffer, 0, sizeof(struct calling_interface_buffer));
 283 }
 284
 285 static void release_buffer(void)
 286 {
 287         mutex_unlock(&buffer_mutex);
 288 }
 289
 290 static void __init parse_da_table(const struct dmi_header *dm)
 291 {
 292         /* Final token is a terminator, so we don't want to copy it */
 293         int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
 294         struct calling_interface_token *new_da_tokens;
 295         struct calling_interface_structure *table =
 296                 container_of(dm, struct calling_interface_structure, header);
 297
 298         /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
 299            6 bytes of entry */
 300
 301         if (dm->length < 17)
 302                 return;
 303
 304         da_command_address = table->cmdIOAddress;
 305         da_command_code = table->cmdIOCode;
 306
 307         new_da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
 308                                  sizeof(struct calling_interface_token),
 309                                  GFP_KERNEL);
 310
 311         if (!new_da_tokens)
 312                 return;
 313         da_tokens = new_da_tokens;
 314
 315         memcpy(da_tokens+da_num_tokens, table->tokens,
 316                sizeof(struct calling_interface_token) * tokens);
 317
 318         da_num_tokens += tokens;
 319 }
 320
 321 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
 322 {
 323         switch (dm->type) {
 324         case 0xd4: /* Indexed IO */
 325         case 0xd5: /* Protected Area Type 1 */
 326         case 0xd6: /* Protected Area Type 2 */
 327                 break;
 328         case 0xda: /* Calling interface */
 329                 parse_da_table(dm);
 330                 break;
 331         }
 332 }
 333
 334 static int find_token_location(int tokenid)
 335 {
 336         int i;
 337         for (i = 0; i < da_num_tokens; i++) {
 338                 if (da_tokens[i].tokenID == tokenid)
 339                         return da_tokens[i].location;
 340         }
 341
 342         return -1;
 343 }
 344
 345 static struct calling_interface_buffer *
 346 dell_send_request(struct calling_interface_buffer *buffer, int class,
 347                   int select)
 348 {
 349         struct smi_cmd command;
 350
 351         command.magic = SMI_CMD_MAGIC;
 352         command.command_address = da_command_address;
 353         command.command_code = da_command_code;
 354         command.ebx = virt_to_phys(buffer);
 355         command.ecx = 0x42534931;
 356
 357         buffer->class = class;
 358         buffer->select = select;
 359
 360         dcdbas_smi_request(&command);
 361
 362         return buffer;
 363 }
 364
 365 /* Derived from information in DellWirelessCtl.cpp:
 366    Class 17, select 11 is radio control. It returns an array of 32-bit values.
 367
 368    Input byte 0 = 0: Wireless information
 369
 370    result[0]: return code
 371    result[1]:
 372      Bit 0:      Hardware switch supported
 373      Bit 1:      Wifi locator supported
 374      Bit 2:      Wifi is supported
 375      Bit 3:      Bluetooth is supported
 376      Bit 4:      WWAN is supported
 377      Bit 5:      Wireless keyboard supported
 378      Bits 6-7:   Reserved
 379      Bit 8:      Wifi is installed
 380      Bit 9:      Bluetooth is installed
 381      Bit 10:     WWAN is installed
 382      Bits 11-15: Reserved
 383      Bit 16:     Hardware switch is on
 384      Bit 17:     Wifi is blocked
 385      Bit 18:     Bluetooth is blocked
 386      Bit 19:     WWAN is blocked
 387      Bits 20-31: Reserved
 388    result[2]: NVRAM size in bytes
 389    result[3]: NVRAM format version number
 390
 391    Input byte 0 = 2: Wireless switch configuration
 392    result[0]: return code
 393    result[1]:
 394      Bit 0:      Wifi controlled by switch
 395      Bit 1:      Bluetooth controlled by switch
 396      Bit 2:      WWAN controlled by switch
 397      Bits 3-6:   Reserved
 398      Bit 7:      Wireless switch config locked
 399      Bit 8:      Wifi locator enabled
 400      Bits 9-14:  Reserved
 401      Bit 15:     Wifi locator setting locked
 402      Bits 16-31: Reserved
 403 */
 404
 405 static int dell_rfkill_set(void *data, bool blocked)
 406 {
 407         int disable = blocked ? 1 : 0;
 408         unsigned long radio = (unsigned long)data;
 409         int hwswitch_bit = (unsigned long)data - 1;
 410
 411         get_buffer();
 412         dell_send_request(buffer, 17, 11);
 413
 414         /* If the hardware switch controls this radio, and the hardware
 415            switch is disabled, always disable the radio */
 416         if ((hwswitch_state & BIT(hwswitch_bit)) &&
 417             !(buffer->output[1] & BIT(16)))
 418                 disable = 1;
 419
 420         buffer->input[0] = (1 | (radio<<8) | (disable << 16));
 421         dell_send_request(buffer, 17, 11);
 422
 423         release_buffer();
 424         return 0;
 425 }
 426
 427 /* Must be called with the buffer held */
 428 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
 429                                         int status)
 430 {
 431         if (status & BIT(0)) {
 432                 /* Has hw-switch, sync sw_state to BIOS */
 433                 int block = rfkill_blocked(rfkill);
 434                 buffer->input[0] = (1 | (radio << 8) | (block << 16));
 435                 dell_send_request(buffer, 17, 11);
 436         } else {
 437                 /* No hw-switch, sync BIOS state to sw_state */
 438                 rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
 439         }
 440 }
 441
 442 static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
 443                                         int status)
 444 {
 445         if (hwswitch_state & (BIT(radio - 1)))
 446                 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
 447 }
 448
 449 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 450 {
 451         int status;
 452
 453         get_buffer();
 454         dell_send_request(buffer, 17, 11);
 455         status = buffer->output[1];
 456
 457         dell_rfkill_update_hw_state(rfkill, (unsigned long)data, status);
 458
 459         release_buffer();
 460 }
 461
 462 static const struct rfkill_ops dell_rfkill_ops = {
 463         .set_block = dell_rfkill_set,
 464         .query = dell_rfkill_query,
 465 };
 466
 467 static struct dentry *dell_laptop_dir;
 468
 469 static int dell_debugfs_show(struct seq_file *s, void *data)
 470 {
 471         int status;
 472
 473         get_buffer();
 474         dell_send_request(buffer, 17, 11);
 475         status = buffer->output[1];
 476         release_buffer();
 477
 478         seq_printf(s, "status:\t0x%X\n", status);
 479         seq_printf(s, "Bit 0 : Hardware switch supported:   %lu\n",
 480                    status & BIT(0));
 481         seq_printf(s, "Bit 1 : Wifi locator supported:      %lu\n",
 482                   (status & BIT(1)) >> 1);
 483         seq_printf(s, "Bit 2 : Wifi is supported:           %lu\n",
 484                   (status & BIT(2)) >> 2);
 485         seq_printf(s, "Bit 3 : Bluetooth is supported:      %lu\n",
 486                   (status & BIT(3)) >> 3);
 487         seq_printf(s, "Bit 4 : WWAN is supported:           %lu\n",
 488                   (status & BIT(4)) >> 4);
 489         seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
 490                   (status & BIT(5)) >> 5);
 491         seq_printf(s, "Bit 8 : Wifi is installed:           %lu\n",
 492                   (status & BIT(8)) >> 8);
 493         seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
 494                   (status & BIT(9)) >> 9);
 495         seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
 496                   (status & BIT(10)) >> 10);
 497         seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
 498                   (status & BIT(16)) >> 16);
 499         seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
 500                   (status & BIT(17)) >> 17);
 501         seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
 502                   (status & BIT(18)) >> 18);
 503         seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
 504                   (status & BIT(19)) >> 19);
 505
 506         seq_printf(s, "\nhwswitch_state:\t0x%X\n", hwswitch_state);
 507         seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
 508                    hwswitch_state & BIT(0));
 509         seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
 510                    (hwswitch_state & BIT(1)) >> 1);
 511         seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
 512                    (hwswitch_state & BIT(2)) >> 2);
 513         seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
 514                    (hwswitch_state & BIT(7)) >> 7);
 515         seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
 516                    (hwswitch_state & BIT(8)) >> 8);
 517         seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
 518                    (hwswitch_state & BIT(15)) >> 15);
 519
 520         return 0;
 521 }
 522
 523 static int dell_debugfs_open(struct inode *inode, struct file *file)
 524 {
 525         return single_open(file, dell_debugfs_show, inode->i_private);
 526 }
 527
 528 static const struct file_operations dell_debugfs_fops = {
 529         .owner = THIS_MODULE,
 530         .open = dell_debugfs_open,
 531         .read = seq_read,
 532         .llseek = seq_lseek,
 533         .release = single_release,
 534 };
 535
 536 static void dell_update_rfkill(struct work_struct *ignored)
 537 {
 538         int status;
 539
 540         get_buffer();
 541         dell_send_request(buffer, 17, 11);
 542         status = buffer->output[1];
 543
 544         if (wifi_rfkill) {
 545                 dell_rfkill_update_hw_state(wifi_rfkill, 1, status);
 546                 dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
 547         }
 548         if (bluetooth_rfkill) {
 549                 dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status);
 550                 dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
 551         }
 552         if (wwan_rfkill) {
 553                 dell_rfkill_update_hw_state(wwan_rfkill, 3, status);
 554                 dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
 555         }
 556
 557         release_buffer();
 558 }
 559 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
 560
 561 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
 562                               struct serio *port)
 563 {
 564         static bool extended;
 565
 566         if (str & 0x20)
 567                 return false;
 568
 569         if (unlikely(data == 0xe0)) {
 570                 extended = true;
 571                 return false;
 572         } else if (unlikely(extended)) {
 573                 switch (data) {
 574                 case 0x8:
 575                         schedule_delayed_work(&dell_rfkill_work,
 576                                               round_jiffies_relative(HZ / 4));
 577                         break;
 578                 }
 579                 extended = false;
 580         }
 581
 582         return false;
 583 }
 584
 585 static int __init dell_setup_rfkill(void)
 586 {
 587         int status, ret, whitelisted;
 588         const char *product;
 589
 590         /*
 591          * rfkill support causes trouble on various models, mostly Inspirons.
 592          * So we whitelist certain series, and don't support rfkill on others.
 593          */
 594         whitelisted = 0;
 595         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 596         if (product &&  (strncmp(product, "Latitude", 8) == 0 ||
 597                          strncmp(product, "Precision", 9) == 0))
 598                 whitelisted = 1;
 599         if (!force_rfkill && !whitelisted)
 600                 return 0;
 601
 602         get_buffer();
 603         dell_send_request(buffer, 17, 11);
 604         status = buffer->output[1];
 605         buffer->input[0] = 0x2;
 606         dell_send_request(buffer, 17, 11);
 607         hwswitch_state = buffer->output[1];
 608         release_buffer();
 609
 610         if (!(status & BIT(0))) {
 611                 if (force_rfkill) {
 612                         /* No hwsitch, clear all hw-controlled bits */
 613                         hwswitch_state &= ~7;
 614                 } else {
 615                         /* rfkill is only tested on laptops with a hwswitch */
 616                         return 0;
 617                 }
 618         }
 619
 620         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 621                 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
 622                                            RFKILL_TYPE_WLAN,
 623                                            &dell_rfkill_ops, (void *) 1);
 624                 if (!wifi_rfkill) {
 625                         ret = -ENOMEM;
 626                         goto err_wifi;
 627                 }
 628                 ret = rfkill_register(wifi_rfkill);
 629                 if (ret)
 630                         goto err_wifi;
 631         }
 632
 633         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 634                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
 635                                                 &platform_device->dev,
 636                                                 RFKILL_TYPE_BLUETOOTH,
 637                                                 &dell_rfkill_ops, (void *) 2);
 638                 if (!bluetooth_rfkill) {
 639                         ret = -ENOMEM;
 640                         goto err_bluetooth;
 641                 }
 642                 ret = rfkill_register(bluetooth_rfkill);
 643                 if (ret)
 644                         goto err_bluetooth;
 645         }
 646
 647         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 648                 wwan_rfkill = rfkill_alloc("dell-wwan",
 649                                            &platform_device->dev,
 650                                            RFKILL_TYPE_WWAN,
 651                                            &dell_rfkill_ops, (void *) 3);
 652                 if (!wwan_rfkill) {
 653                         ret = -ENOMEM;
 654                         goto err_wwan;
 655                 }
 656                 ret = rfkill_register(wwan_rfkill);
 657                 if (ret)
 658                         goto err_wwan;
 659         }
 660
 661         ret = i8042_install_filter(dell_laptop_i8042_filter);
 662         if (ret) {
 663                 pr_warn("Unable to install key filter\n");
 664                 goto err_filter;
 665         }
 666
 667         return 0;
 668 err_filter:
 669         if (wwan_rfkill)
 670                 rfkill_unregister(wwan_rfkill);
 671 err_wwan:
 672         rfkill_destroy(wwan_rfkill);
 673         if (bluetooth_rfkill)
 674                 rfkill_unregister(bluetooth_rfkill);
 675 err_bluetooth:
 676         rfkill_destroy(bluetooth_rfkill);
 677         if (wifi_rfkill)
 678                 rfkill_unregister(wifi_rfkill);
 679 err_wifi:
 680         rfkill_destroy(wifi_rfkill);
 681
 682         return ret;
 683 }
 684
 685 static void dell_cleanup_rfkill(void)
 686 {
 687         if (wifi_rfkill) {
 688                 rfkill_unregister(wifi_rfkill);
 689                 rfkill_destroy(wifi_rfkill);
 690         }
 691         if (bluetooth_rfkill) {
 692                 rfkill_unregister(bluetooth_rfkill);
 693                 rfkill_destroy(bluetooth_rfkill);
 694         }
 695         if (wwan_rfkill) {
 696                 rfkill_unregister(wwan_rfkill);
 697                 rfkill_destroy(wwan_rfkill);
 698         }
 699 }
 700
 701 static int dell_send_intensity(struct backlight_device *bd)
 702 {
 703         int ret = 0;
 704
 705         get_buffer();
 706         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
 707         buffer->input[1] = bd->props.brightness;
 708
 709         if (buffer->input[0] == -1) {
 710                 ret = -ENODEV;
 711                 goto out;
 712         }
 713
 714         if (power_supply_is_system_supplied() > 0)
 715                 dell_send_request(buffer, 1, 2);
 716         else
 717                 dell_send_request(buffer, 1, 1);
 718
 719 out:
 720         release_buffer();
 721         return ret;
 722 }
 723
 724 static int dell_get_intensity(struct backlight_device *bd)
 725 {
 726         int ret = 0;
 727
 728         get_buffer();
 729         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
 730
 731         if (buffer->input[0] == -1) {
 732                 ret = -ENODEV;
 733                 goto out;
 734         }
 735
 736         if (power_supply_is_system_supplied() > 0)
 737                 dell_send_request(buffer, 0, 2);
 738         else
 739                 dell_send_request(buffer, 0, 1);
 740
 741         ret = buffer->output[1];
 742
 743 out:
 744         release_buffer();
 745         return ret;
 746 }
 747
 748 static const struct backlight_ops dell_ops = {
 749         .get_brightness = dell_get_intensity,
 750         .update_status  = dell_send_intensity,
 751 };
 752
 753 static void touchpad_led_on(void)
 754 {
 755         int command = 0x97;
 756         char data = 1;
 757         i8042_command(&data, command | 1 << 12);
 758 }
 759
 760 static void touchpad_led_off(void)
 761 {
 762         int command = 0x97;
 763         char data = 2;
 764         i8042_command(&data, command | 1 << 12);
 765 }
 766
 767 static void touchpad_led_set(struct led_classdev *led_cdev,
 768         enum led_brightness value)
 769 {
 770         if (value > 0)
 771                 touchpad_led_on();
 772         else
 773                 touchpad_led_off();
 774 }
 775
 776 static struct led_classdev touchpad_led = {
 777         .name = "dell-laptop::touchpad",
 778         .brightness_set = touchpad_led_set,
 779         .flags = LED_CORE_SUSPENDRESUME,
 780 };
 781
 782 static int touchpad_led_init(struct device *dev)
 783 {
 784         return led_classdev_register(dev, &touchpad_led);
 785 }
 786
 787 static void touchpad_led_exit(void)
 788 {
 789         led_classdev_unregister(&touchpad_led);
 790 }
 791
 792 static int __init dell_init(void)
 793 {
 794         int max_intensity = 0;
 795         int ret;
 796
 797         if (!dmi_check_system(dell_device_table))
 798                 return -ENODEV;
 799
 800         quirks = NULL;
 801         /* find if this machine support other functions */
 802         dmi_check_system(dell_quirks);
 803
 804         dmi_walk(find_tokens, NULL);
 805
 806         if (!da_tokens)  {
 807                 pr_info("Unable to find dmi tokens\n");
 808                 return -ENODEV;
 809         }
 810
 811         ret = platform_driver_register(&platform_driver);
 812         if (ret)
 813                 goto fail_platform_driver;
 814         platform_device = platform_device_alloc("dell-laptop", -1);
 815         if (!platform_device) {
 816                 ret = -ENOMEM;
 817                 goto fail_platform_device1;
 818         }
 819         ret = platform_device_add(platform_device);
 820         if (ret)
 821                 goto fail_platform_device2;
 822
 823         /*
 824          * Allocate buffer below 4GB for SMI data--only 32-bit physical addr
 825          * is passed to SMI handler.
 826          */
 827         buffer = (void *)__get_free_page(GFP_KERNEL | GFP_DMA32);
 828         if (!buffer) {
 829                 ret = -ENOMEM;
 830                 goto fail_buffer;
 831         }
 832
 833         ret = dell_setup_rfkill();
 834
 835         if (ret) {
 836                 pr_warn("Unable to setup rfkill\n");
 837                 goto fail_rfkill;
 838         }
 839
 840         if (quirks && quirks->touchpad_led)
 841                 touchpad_led_init(&platform_device->dev);
 842
 843         dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
 844         if (dell_laptop_dir != NULL)
 845                 debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
 846                                     &dell_debugfs_fops);
 847
 848 #ifdef CONFIG_ACPI
 849         /* In the event of an ACPI backlight being available, don't
 850          * register the platform controller.
 851          */
 852         if (acpi_video_backlight_support())
 853                 return 0;
 854 #endif
 855
 856         get_buffer();
 857         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
 858         if (buffer->input[0] != -1) {
 859                 dell_send_request(buffer, 0, 2);
 860                 max_intensity = buffer->output[3];
 861         }
 862         release_buffer();
 863
 864         if (max_intensity) {
 865                 struct backlight_properties props;
 866                 memset(&props, 0, sizeof(struct backlight_properties));
 867                 props.type = BACKLIGHT_PLATFORM;
 868                 props.max_brightness = max_intensity;
 869                 dell_backlight_device = backlight_device_register("dell_backlight",
 870                                                                   &platform_device->dev,
 871                                                                   NULL,
 872                                                                   &dell_ops,
 873                                                                   &props);
 874
 875                 if (IS_ERR(dell_backlight_device)) {
 876                         ret = PTR_ERR(dell_backlight_device);
 877                         dell_backlight_device = NULL;
 878                         goto fail_backlight;
 879                 }
 880
 881                 dell_backlight_device->props.brightness =
 882                         dell_get_intensity(dell_backlight_device);
 883                 backlight_update_status(dell_backlight_device);
 884         }
 885
 886         return 0;
 887
 888 fail_backlight:
 889         i8042_remove_filter(dell_laptop_i8042_filter);
 890         cancel_delayed_work_sync(&dell_rfkill_work);
 891         dell_cleanup_rfkill();
 892 fail_rfkill:
 893         free_page((unsigned long)buffer);
 894 fail_buffer:
 895         platform_device_del(platform_device);
 896 fail_platform_device2:
 897         platform_device_put(platform_device);
 898 fail_platform_device1:
 899         platform_driver_unregister(&platform_driver);
 900 fail_platform_driver:
 901         kfree(da_tokens);
 902         return ret;
 903 }
 904
 905 static void __exit dell_exit(void)
 906 {
 907         debugfs_remove_recursive(dell_laptop_dir);
 908         if (quirks && quirks->touchpad_led)
 909                 touchpad_led_exit();
 910         i8042_remove_filter(dell_laptop_i8042_filter);
 911         cancel_delayed_work_sync(&dell_rfkill_work);
 912         backlight_device_unregister(dell_backlight_device);
 913         dell_cleanup_rfkill();
 914         if (platform_device) {
 915                 platform_device_unregister(platform_device);
 916                 platform_driver_unregister(&platform_driver);
 917         }
 918         kfree(da_tokens);
 919         free_page((unsigned long)buffer);
 920 }
 921
 922 module_init(dell_init);
 923 module_exit(dell_exit);
 924
 925 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
 926 MODULE_DESCRIPTION("Dell laptop driver");
 927 MODULE_LICENSE("GPL");