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 struct page *bufferpage;
 276 static DEFINE_MUTEX(buffer_mutex);
 277
 278 static int hwswitch_state;
 279
 280 static void get_buffer(void)
 281 {
 282         mutex_lock(&buffer_mutex);
 283         memset(buffer, 0, sizeof(struct calling_interface_buffer));
 284 }
 285
 286 static void release_buffer(void)
 287 {
 288         mutex_unlock(&buffer_mutex);
 289 }
 290
 291 static void __init parse_da_table(const struct dmi_header *dm)
 292 {
 293         /* Final token is a terminator, so we don't want to copy it */
 294         int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
 295         struct calling_interface_token *new_da_tokens;
 296         struct calling_interface_structure *table =
 297                 container_of(dm, struct calling_interface_structure, header);
 298
 299         /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
 300            6 bytes of entry */
 301
 302         if (dm->length < 17)
 303                 return;
 304
 305         da_command_address = table->cmdIOAddress;
 306         da_command_code = table->cmdIOCode;
 307
 308         new_da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
 309                                  sizeof(struct calling_interface_token),
 310                                  GFP_KERNEL);
 311
 312         if (!new_da_tokens)
 313                 return;
 314         da_tokens = new_da_tokens;
 315
 316         memcpy(da_tokens+da_num_tokens, table->tokens,
 317                sizeof(struct calling_interface_token) * tokens);
 318
 319         da_num_tokens += tokens;
 320 }
 321
 322 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
 323 {
 324         switch (dm->type) {
 325         case 0xd4: /* Indexed IO */
 326         case 0xd5: /* Protected Area Type 1 */
 327         case 0xd6: /* Protected Area Type 2 */
 328                 break;
 329         case 0xda: /* Calling interface */
 330                 parse_da_table(dm);
 331                 break;
 332         }
 333 }
 334
 335 static int find_token_location(int tokenid)
 336 {
 337         int i;
 338         for (i = 0; i < da_num_tokens; i++) {
 339                 if (da_tokens[i].tokenID == tokenid)
 340                         return da_tokens[i].location;
 341         }
 342
 343         return -1;
 344 }
 345
 346 static struct calling_interface_buffer *
 347 dell_send_request(struct calling_interface_buffer *buffer, int class,
 348                   int select)
 349 {
 350         struct smi_cmd command;
 351
 352         command.magic = SMI_CMD_MAGIC;
 353         command.command_address = da_command_address;
 354         command.command_code = da_command_code;
 355         command.ebx = virt_to_phys(buffer);
 356         command.ecx = 0x42534931;
 357
 358         buffer->class = class;
 359         buffer->select = select;
 360
 361         dcdbas_smi_request(&command);
 362
 363         return buffer;
 364 }
 365
 366 /* Derived from information in DellWirelessCtl.cpp:
 367    Class 17, select 11 is radio control. It returns an array of 32-bit values.
 368
 369    Input byte 0 = 0: Wireless information
 370
 371    result[0]: return code
 372    result[1]:
 373      Bit 0:      Hardware switch supported
 374      Bit 1:      Wifi locator supported
 375      Bit 2:      Wifi is supported
 376      Bit 3:      Bluetooth is supported
 377      Bit 4:      WWAN is supported
 378      Bit 5:      Wireless keyboard supported
 379      Bits 6-7:   Reserved
 380      Bit 8:      Wifi is installed
 381      Bit 9:      Bluetooth is installed
 382      Bit 10:     WWAN is installed
 383      Bits 11-15: Reserved
 384      Bit 16:     Hardware switch is on
 385      Bit 17:     Wifi is blocked
 386      Bit 18:     Bluetooth is blocked
 387      Bit 19:     WWAN is blocked
 388      Bits 20-31: Reserved
 389    result[2]: NVRAM size in bytes
 390    result[3]: NVRAM format version number
 391
 392    Input byte 0 = 2: Wireless switch configuration
 393    result[0]: return code
 394    result[1]:
 395      Bit 0:      Wifi controlled by switch
 396      Bit 1:      Bluetooth controlled by switch
 397      Bit 2:      WWAN controlled by switch
 398      Bits 3-6:   Reserved
 399      Bit 7:      Wireless switch config locked
 400      Bit 8:      Wifi locator enabled
 401      Bits 9-14:  Reserved
 402      Bit 15:     Wifi locator setting locked
 403      Bits 16-31: Reserved
 404 */
 405
 406 static int dell_rfkill_set(void *data, bool blocked)
 407 {
 408         int disable = blocked ? 1 : 0;
 409         unsigned long radio = (unsigned long)data;
 410         int hwswitch_bit = (unsigned long)data - 1;
 411
 412         get_buffer();
 413         dell_send_request(buffer, 17, 11);
 414
 415         /* If the hardware switch controls this radio, and the hardware
 416            switch is disabled, always disable the radio */
 417         if ((hwswitch_state & BIT(hwswitch_bit)) &&
 418             !(buffer->output[1] & BIT(16)))
 419                 disable = 1;
 420
 421         buffer->input[0] = (1 | (radio<<8) | (disable << 16));
 422         dell_send_request(buffer, 17, 11);
 423
 424         release_buffer();
 425         return 0;
 426 }
 427
 428 /* Must be called with the buffer held */
 429 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
 430                                         int status)
 431 {
 432         if (status & BIT(0)) {
 433                 /* Has hw-switch, sync sw_state to BIOS */
 434                 int block = rfkill_blocked(rfkill);
 435                 buffer->input[0] = (1 | (radio << 8) | (block << 16));
 436                 dell_send_request(buffer, 17, 11);
 437         } else {
 438                 /* No hw-switch, sync BIOS state to sw_state */
 439                 rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
 440         }
 441 }
 442
 443 static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
 444                                         int status)
 445 {
 446         if (hwswitch_state & (BIT(radio - 1)))
 447                 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
 448 }
 449
 450 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 451 {
 452         int status;
 453
 454         get_buffer();
 455         dell_send_request(buffer, 17, 11);
 456         status = buffer->output[1];
 457
 458         dell_rfkill_update_hw_state(rfkill, (unsigned long)data, status);
 459
 460         release_buffer();
 461 }
 462
 463 static const struct rfkill_ops dell_rfkill_ops = {
 464         .set_block = dell_rfkill_set,
 465         .query = dell_rfkill_query,
 466 };
 467
 468 static struct dentry *dell_laptop_dir;
 469
 470 static int dell_debugfs_show(struct seq_file *s, void *data)
 471 {
 472         int status;
 473
 474         get_buffer();
 475         dell_send_request(buffer, 17, 11);
 476         status = buffer->output[1];
 477         release_buffer();
 478
 479         seq_printf(s, "status:\t0x%X\n", status);
 480         seq_printf(s, "Bit 0 : Hardware switch supported:   %lu\n",
 481                    status & BIT(0));
 482         seq_printf(s, "Bit 1 : Wifi locator supported:      %lu\n",
 483                   (status & BIT(1)) >> 1);
 484         seq_printf(s, "Bit 2 : Wifi is supported:           %lu\n",
 485                   (status & BIT(2)) >> 2);
 486         seq_printf(s, "Bit 3 : Bluetooth is supported:      %lu\n",
 487                   (status & BIT(3)) >> 3);
 488         seq_printf(s, "Bit 4 : WWAN is supported:           %lu\n",
 489                   (status & BIT(4)) >> 4);
 490         seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
 491                   (status & BIT(5)) >> 5);
 492         seq_printf(s, "Bit 8 : Wifi is installed:           %lu\n",
 493                   (status & BIT(8)) >> 8);
 494         seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
 495                   (status & BIT(9)) >> 9);
 496         seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
 497                   (status & BIT(10)) >> 10);
 498         seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
 499                   (status & BIT(16)) >> 16);
 500         seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
 501                   (status & BIT(17)) >> 17);
 502         seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
 503                   (status & BIT(18)) >> 18);
 504         seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
 505                   (status & BIT(19)) >> 19);
 506
 507         seq_printf(s, "\nhwswitch_state:\t0x%X\n", hwswitch_state);
 508         seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
 509                    hwswitch_state & BIT(0));
 510         seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
 511                    (hwswitch_state & BIT(1)) >> 1);
 512         seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
 513                    (hwswitch_state & BIT(2)) >> 2);
 514         seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
 515                    (hwswitch_state & BIT(7)) >> 7);
 516         seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
 517                    (hwswitch_state & BIT(8)) >> 8);
 518         seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
 519                    (hwswitch_state & BIT(15)) >> 15);
 520
 521         return 0;
 522 }
 523
 524 static int dell_debugfs_open(struct inode *inode, struct file *file)
 525 {
 526         return single_open(file, dell_debugfs_show, inode->i_private);
 527 }
 528
 529 static const struct file_operations dell_debugfs_fops = {
 530         .owner = THIS_MODULE,
 531         .open = dell_debugfs_open,
 532         .read = seq_read,
 533         .llseek = seq_lseek,
 534         .release = single_release,
 535 };
 536
 537 static void dell_update_rfkill(struct work_struct *ignored)
 538 {
 539         int status;
 540
 541         get_buffer();
 542         dell_send_request(buffer, 17, 11);
 543         status = buffer->output[1];
 544
 545         if (wifi_rfkill) {
 546                 dell_rfkill_update_hw_state(wifi_rfkill, 1, status);
 547                 dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
 548         }
 549         if (bluetooth_rfkill) {
 550                 dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status);
 551                 dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
 552         }
 553         if (wwan_rfkill) {
 554                 dell_rfkill_update_hw_state(wwan_rfkill, 3, status);
 555                 dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
 556         }
 557
 558         release_buffer();
 559 }
 560 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
 561
 562
 563 static int __init dell_setup_rfkill(void)
 564 {
 565         int status;
 566         int ret;
 567         const char *product;
 568
 569         /*
 570          * rfkill causes trouble on various non Latitudes, according to Dell
 571          * actually testing the rfkill functionality is only done on Latitudes.
 572          */
 573         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 574         if (!force_rfkill && (!product || strncmp(product, "Latitude", 8)))
 575                 return 0;
 576
 577         get_buffer();
 578         dell_send_request(buffer, 17, 11);
 579         status = buffer->output[1];
 580         buffer->input[0] = 0x2;
 581         dell_send_request(buffer, 17, 11);
 582         hwswitch_state = buffer->output[1];
 583         release_buffer();
 584
 585         if (!(status & BIT(0))) {
 586                 if (force_rfkill) {
 587                         /* No hwsitch, clear all hw-controlled bits */
 588                         hwswitch_state &= ~7;
 589                 } else {
 590                         /* rfkill is only tested on laptops with a hwswitch */
 591                         return 0;
 592                 }
 593         }
 594
 595         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 596                 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
 597                                            RFKILL_TYPE_WLAN,
 598                                            &dell_rfkill_ops, (void *) 1);
 599                 if (!wifi_rfkill) {
 600                         ret = -ENOMEM;
 601                         goto err_wifi;
 602                 }
 603                 ret = rfkill_register(wifi_rfkill);
 604                 if (ret)
 605                         goto err_wifi;
 606         }
 607
 608         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 609                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
 610                                                 &platform_device->dev,
 611                                                 RFKILL_TYPE_BLUETOOTH,
 612                                                 &dell_rfkill_ops, (void *) 2);
 613                 if (!bluetooth_rfkill) {
 614                         ret = -ENOMEM;
 615                         goto err_bluetooth;
 616                 }
 617                 ret = rfkill_register(bluetooth_rfkill);
 618                 if (ret)
 619                         goto err_bluetooth;
 620         }
 621
 622         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 623                 wwan_rfkill = rfkill_alloc("dell-wwan",
 624                                            &platform_device->dev,
 625                                            RFKILL_TYPE_WWAN,
 626                                            &dell_rfkill_ops, (void *) 3);
 627                 if (!wwan_rfkill) {
 628                         ret = -ENOMEM;
 629                         goto err_wwan;
 630                 }
 631                 ret = rfkill_register(wwan_rfkill);
 632                 if (ret)
 633                         goto err_wwan;
 634         }
 635
 636         return 0;
 637 err_wwan:
 638         rfkill_destroy(wwan_rfkill);
 639         if (bluetooth_rfkill)
 640                 rfkill_unregister(bluetooth_rfkill);
 641 err_bluetooth:
 642         rfkill_destroy(bluetooth_rfkill);
 643         if (wifi_rfkill)
 644                 rfkill_unregister(wifi_rfkill);
 645 err_wifi:
 646         rfkill_destroy(wifi_rfkill);
 647
 648         return ret;
 649 }
 650
 651 static void dell_cleanup_rfkill(void)
 652 {
 653         if (wifi_rfkill) {
 654                 rfkill_unregister(wifi_rfkill);
 655                 rfkill_destroy(wifi_rfkill);
 656         }
 657         if (bluetooth_rfkill) {
 658                 rfkill_unregister(bluetooth_rfkill);
 659                 rfkill_destroy(bluetooth_rfkill);
 660         }
 661         if (wwan_rfkill) {
 662                 rfkill_unregister(wwan_rfkill);
 663                 rfkill_destroy(wwan_rfkill);
 664         }
 665 }
 666
 667 static int dell_send_intensity(struct backlight_device *bd)
 668 {
 669         int ret = 0;
 670
 671         get_buffer();
 672         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
 673         buffer->input[1] = bd->props.brightness;
 674
 675         if (buffer->input[0] == -1) {
 676                 ret = -ENODEV;
 677                 goto out;
 678         }
 679
 680         if (power_supply_is_system_supplied() > 0)
 681                 dell_send_request(buffer, 1, 2);
 682         else
 683                 dell_send_request(buffer, 1, 1);
 684
 685 out:
 686         release_buffer();
 687         return 0;
 688 }
 689
 690 static int dell_get_intensity(struct backlight_device *bd)
 691 {
 692         int ret = 0;
 693
 694         get_buffer();
 695         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
 696
 697         if (buffer->input[0] == -1) {
 698                 ret = -ENODEV;
 699                 goto out;
 700         }
 701
 702         if (power_supply_is_system_supplied() > 0)
 703                 dell_send_request(buffer, 0, 2);
 704         else
 705                 dell_send_request(buffer, 0, 1);
 706
 707         ret = buffer->output[1];
 708
 709 out:
 710         release_buffer();
 711         return ret;
 712 }
 713
 714 static const struct backlight_ops dell_ops = {
 715         .get_brightness = dell_get_intensity,
 716         .update_status  = dell_send_intensity,
 717 };
 718
 719 static void touchpad_led_on(void)
 720 {
 721         int command = 0x97;
 722         char data = 1;
 723         i8042_command(&data, command | 1 << 12);
 724 }
 725
 726 static void touchpad_led_off(void)
 727 {
 728         int command = 0x97;
 729         char data = 2;
 730         i8042_command(&data, command | 1 << 12);
 731 }
 732
 733 static void touchpad_led_set(struct led_classdev *led_cdev,
 734         enum led_brightness value)
 735 {
 736         if (value > 0)
 737                 touchpad_led_on();
 738         else
 739                 touchpad_led_off();
 740 }
 741
 742 static struct led_classdev touchpad_led = {
 743         .name = "dell-laptop::touchpad",
 744         .brightness_set = touchpad_led_set,
 745         .flags = LED_CORE_SUSPENDRESUME,
 746 };
 747
 748 static int touchpad_led_init(struct device *dev)
 749 {
 750         return led_classdev_register(dev, &touchpad_led);
 751 }
 752
 753 static void touchpad_led_exit(void)
 754 {
 755         led_classdev_unregister(&touchpad_led);
 756 }
 757
 758 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
 759                               struct serio *port)
 760 {
 761         static bool extended;
 762
 763         if (str & 0x20)
 764                 return false;
 765
 766         if (unlikely(data == 0xe0)) {
 767                 extended = true;
 768                 return false;
 769         } else if (unlikely(extended)) {
 770                 switch (data) {
 771                 case 0x8:
 772                         schedule_delayed_work(&dell_rfkill_work,
 773                                               round_jiffies_relative(HZ / 4));
 774                         break;
 775                 }
 776                 extended = false;
 777         }
 778
 779         return false;
 780 }
 781
 782 static int __init dell_init(void)
 783 {
 784         int max_intensity = 0;
 785         int ret;
 786
 787         if (!dmi_check_system(dell_device_table))
 788                 return -ENODEV;
 789
 790         quirks = NULL;
 791         /* find if this machine support other functions */
 792         dmi_check_system(dell_quirks);
 793
 794         dmi_walk(find_tokens, NULL);
 795
 796         if (!da_tokens)  {
 797                 pr_info("Unable to find dmi tokens\n");
 798                 return -ENODEV;
 799         }
 800
 801         ret = platform_driver_register(&platform_driver);
 802         if (ret)
 803                 goto fail_platform_driver;
 804         platform_device = platform_device_alloc("dell-laptop", -1);
 805         if (!platform_device) {
 806                 ret = -ENOMEM;
 807                 goto fail_platform_device1;
 808         }
 809         ret = platform_device_add(platform_device);
 810         if (ret)
 811                 goto fail_platform_device2;
 812
 813         /*
 814          * Allocate buffer below 4GB for SMI data--only 32-bit physical addr
 815          * is passed to SMI handler.
 816          */
 817         bufferpage = alloc_page(GFP_KERNEL | GFP_DMA32);
 818         if (!bufferpage) {
 819                 ret = -ENOMEM;
 820                 goto fail_buffer;
 821         }
 822         buffer = page_address(bufferpage);
 823
 824         ret = dell_setup_rfkill();
 825
 826         if (ret) {
 827                 pr_warn("Unable to setup rfkill\n");
 828                 goto fail_rfkill;
 829         }
 830
 831         ret = i8042_install_filter(dell_laptop_i8042_filter);
 832         if (ret) {
 833                 pr_warn("Unable to install key filter\n");
 834                 goto fail_filter;
 835         }
 836
 837         if (quirks && quirks->touchpad_led)
 838                 touchpad_led_init(&platform_device->dev);
 839
 840         dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
 841         if (dell_laptop_dir != NULL)
 842                 debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
 843                                     &dell_debugfs_fops);
 844
 845 #ifdef CONFIG_ACPI
 846         /* In the event of an ACPI backlight being available, don't
 847          * register the platform controller.
 848          */
 849         if (acpi_video_backlight_support())
 850                 return 0;
 851 #endif
 852
 853         get_buffer();
 854         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
 855         if (buffer->input[0] != -1) {
 856                 dell_send_request(buffer, 0, 2);
 857                 max_intensity = buffer->output[3];
 858         }
 859         release_buffer();
 860
 861         if (max_intensity) {
 862                 struct backlight_properties props;
 863                 memset(&props, 0, sizeof(struct backlight_properties));
 864                 props.type = BACKLIGHT_PLATFORM;
 865                 props.max_brightness = max_intensity;
 866                 dell_backlight_device = backlight_device_register("dell_backlight",
 867                                                                   &platform_device->dev,
 868                                                                   NULL,
 869                                                                   &dell_ops,
 870                                                                   &props);
 871
 872                 if (IS_ERR(dell_backlight_device)) {
 873                         ret = PTR_ERR(dell_backlight_device);
 874                         dell_backlight_device = NULL;
 875                         goto fail_backlight;
 876                 }
 877
 878                 dell_backlight_device->props.brightness =
 879                         dell_get_intensity(dell_backlight_device);
 880                 backlight_update_status(dell_backlight_device);
 881         }
 882
 883         return 0;
 884
 885 fail_backlight:
 886         i8042_remove_filter(dell_laptop_i8042_filter);
 887         cancel_delayed_work_sync(&dell_rfkill_work);
 888 fail_filter:
 889         dell_cleanup_rfkill();
 890 fail_rfkill:
 891         free_page((unsigned long)bufferpage);
 892 fail_buffer:
 893         platform_device_del(platform_device);
 894 fail_platform_device2:
 895         platform_device_put(platform_device);
 896 fail_platform_device1:
 897         platform_driver_unregister(&platform_driver);
 898 fail_platform_driver:
 899         kfree(da_tokens);
 900         return ret;
 901 }
 902
 903 static void __exit dell_exit(void)
 904 {
 905         debugfs_remove_recursive(dell_laptop_dir);
 906         if (quirks && quirks->touchpad_led)
 907                 touchpad_led_exit();
 908         i8042_remove_filter(dell_laptop_i8042_filter);
 909         cancel_delayed_work_sync(&dell_rfkill_work);
 910         backlight_device_unregister(dell_backlight_device);
 911         dell_cleanup_rfkill();
 912         if (platform_device) {
 913                 platform_device_unregister(platform_device);
 914                 platform_driver_unregister(&platform_driver);
 915         }
 916         kfree(da_tokens);
 917         free_page((unsigned long)buffer);
 918 }
 919
 920 module_init(dell_init);
 921 module_exit(dell_exit);
 922
 923 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
 924 MODULE_DESCRIPTION("Dell laptop driver");
 925 MODULE_LICENSE("GPL");