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
  97 static const struct dmi_system_id __initdata dell_device_table[] = {
  98         {
  99                 .ident = "Dell laptop",
 100                 .matches = {
 101                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 102                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 103                 },
 104         },
 105         {
 106                 .matches = {
 107                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 108                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
 109                 },
 110         },
 111         {
 112                 .ident = "Dell Computer Corporation",
 113                 .matches = {
 114                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 115                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 116                 },
 117         },
 118         { }
 119 };
 120
 121 static struct dmi_system_id __devinitdata dell_blacklist[] = {
 122         /* Supported by compal-laptop */
 123         {
 124                 .ident = "Dell Mini 9",
 125                 .matches = {
 126                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 127                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 910"),
 128                 },
 129         },
 130         {
 131                 .ident = "Dell Mini 10",
 132                 .matches = {
 133                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 134                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1010"),
 135                 },
 136         },
 137         {
 138                 .ident = "Dell Mini 10v",
 139                 .matches = {
 140                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 141                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1011"),
 142                 },
 143         },
 144         {
 145                 .ident = "Dell Mini 1012",
 146                 .matches = {
 147                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 148                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"),
 149                 },
 150         },
 151         {
 152                 .ident = "Dell Inspiron 11z",
 153                 .matches = {
 154                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 155                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1110"),
 156                 },
 157         },
 158         {
 159                 .ident = "Dell Mini 12",
 160                 .matches = {
 161                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 162                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1210"),
 163                 },
 164         },
 165         {}
 166 };
 167
 168 static struct dmi_system_id __devinitdata dell_quirks[] = {
 169         {
 170                 .callback = dmi_matched,
 171                 .ident = "Dell Vostro V130",
 172                 .matches = {
 173                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 174                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
 175                 },
 176                 .driver_data = &quirk_dell_vostro_v130,
 177         },
 178         {
 179                 .callback = dmi_matched,
 180                 .ident = "Dell Vostro V131",
 181                 .matches = {
 182                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 183                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 184                 },
 185                 .driver_data = &quirk_dell_vostro_v130,
 186         },
 187         {
 188                 .callback = dmi_matched,
 189                 .ident = "Dell Vostro 3555",
 190                 .matches = {
 191                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 192                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
 193                 },
 194                 .driver_data = &quirk_dell_vostro_v130,
 195         },
 196         {
 197                 .callback = dmi_matched,
 198                 .ident = "Dell Inspiron N311z",
 199                 .matches = {
 200                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 201                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
 202                 },
 203                 .driver_data = &quirk_dell_vostro_v130,
 204         },
 205         {
 206                 .callback = dmi_matched,
 207                 .ident = "Dell Inspiron M5110",
 208                 .matches = {
 209                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 210                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
 211                 },
 212                 .driver_data = &quirk_dell_vostro_v130,
 213         },
 214         { }
 215 };
 216
 217 static struct calling_interface_buffer *buffer;
 218 static struct page *bufferpage;
 219 static DEFINE_MUTEX(buffer_mutex);
 220
 221 static int hwswitch_state;
 222
 223 static void get_buffer(void)
 224 {
 225         mutex_lock(&buffer_mutex);
 226         memset(buffer, 0, sizeof(struct calling_interface_buffer));
 227 }
 228
 229 static void release_buffer(void)
 230 {
 231         mutex_unlock(&buffer_mutex);
 232 }
 233
 234 static void __init parse_da_table(const struct dmi_header *dm)
 235 {
 236         /* Final token is a terminator, so we don't want to copy it */
 237         int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
 238         struct calling_interface_structure *table =
 239                 container_of(dm, struct calling_interface_structure, header);
 240
 241         /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
 242            6 bytes of entry */
 243
 244         if (dm->length < 17)
 245                 return;
 246
 247         da_command_address = table->cmdIOAddress;
 248         da_command_code = table->cmdIOCode;
 249
 250         da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
 251                              sizeof(struct calling_interface_token),
 252                              GFP_KERNEL);
 253
 254         if (!da_tokens)
 255                 return;
 256
 257         memcpy(da_tokens+da_num_tokens, table->tokens,
 258                sizeof(struct calling_interface_token) * tokens);
 259
 260         da_num_tokens += tokens;
 261 }
 262
 263 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
 264 {
 265         switch (dm->type) {
 266         case 0xd4: /* Indexed IO */
 267                 break;
 268         case 0xd5: /* Protected Area Type 1 */
 269                 break;
 270         case 0xd6: /* Protected Area Type 2 */
 271                 break;
 272         case 0xda: /* Calling interface */
 273                 parse_da_table(dm);
 274                 break;
 275         }
 276 }
 277
 278 static int find_token_location(int tokenid)
 279 {
 280         int i;
 281         for (i = 0; i < da_num_tokens; i++) {
 282                 if (da_tokens[i].tokenID == tokenid)
 283                         return da_tokens[i].location;
 284         }
 285
 286         return -1;
 287 }
 288
 289 static struct calling_interface_buffer *
 290 dell_send_request(struct calling_interface_buffer *buffer, int class,
 291                   int select)
 292 {
 293         struct smi_cmd command;
 294
 295         command.magic = SMI_CMD_MAGIC;
 296         command.command_address = da_command_address;
 297         command.command_code = da_command_code;
 298         command.ebx = virt_to_phys(buffer);
 299         command.ecx = 0x42534931;
 300
 301         buffer->class = class;
 302         buffer->select = select;
 303
 304         dcdbas_smi_request(&command);
 305
 306         return buffer;
 307 }
 308
 309 /* Derived from information in DellWirelessCtl.cpp:
 310    Class 17, select 11 is radio control. It returns an array of 32-bit values.
 311
 312    Input byte 0 = 0: Wireless information
 313
 314    result[0]: return code
 315    result[1]:
 316      Bit 0:      Hardware switch supported
 317      Bit 1:      Wifi locator supported
 318      Bit 2:      Wifi is supported
 319      Bit 3:      Bluetooth is supported
 320      Bit 4:      WWAN is supported
 321      Bit 5:      Wireless keyboard supported
 322      Bits 6-7:   Reserved
 323      Bit 8:      Wifi is installed
 324      Bit 9:      Bluetooth is installed
 325      Bit 10:     WWAN is installed
 326      Bits 11-15: Reserved
 327      Bit 16:     Hardware switch is on
 328      Bit 17:     Wifi is blocked
 329      Bit 18:     Bluetooth is blocked
 330      Bit 19:     WWAN is blocked
 331      Bits 20-31: Reserved
 332    result[2]: NVRAM size in bytes
 333    result[3]: NVRAM format version number
 334
 335    Input byte 0 = 2: Wireless switch configuration
 336    result[0]: return code
 337    result[1]:
 338      Bit 0:      Wifi controlled by switch
 339      Bit 1:      Bluetooth controlled by switch
 340      Bit 2:      WWAN controlled by switch
 341      Bits 3-6:   Reserved
 342      Bit 7:      Wireless switch config locked
 343      Bit 8:      Wifi locator enabled
 344      Bits 9-14:  Reserved
 345      Bit 15:     Wifi locator setting locked
 346      Bits 16-31: Reserved
 347 */
 348
 349 static int dell_rfkill_set(void *data, bool blocked)
 350 {
 351         int disable = blocked ? 1 : 0;
 352         unsigned long radio = (unsigned long)data;
 353         int hwswitch_bit = (unsigned long)data - 1;
 354         int ret = 0;
 355
 356         get_buffer();
 357         dell_send_request(buffer, 17, 11);
 358
 359         /* If the hardware switch controls this radio, and the hardware
 360            switch is disabled, don't allow changing the software state */
 361         if ((hwswitch_state & BIT(hwswitch_bit)) &&
 362             !(buffer->output[1] & BIT(16))) {
 363                 ret = -EINVAL;
 364                 goto out;
 365         }
 366
 367         buffer->input[0] = (1 | (radio<<8) | (disable << 16));
 368         dell_send_request(buffer, 17, 11);
 369
 370 out:
 371         release_buffer();
 372         return ret;
 373 }
 374
 375 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 376 {
 377         int status;
 378         int bit = (unsigned long)data + 16;
 379         int hwswitch_bit = (unsigned long)data - 1;
 380
 381         get_buffer();
 382         dell_send_request(buffer, 17, 11);
 383         status = buffer->output[1];
 384         release_buffer();
 385
 386         rfkill_set_sw_state(rfkill, !!(status & BIT(bit)));
 387
 388         if (hwswitch_state & (BIT(hwswitch_bit)))
 389                 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
 390 }
 391
 392 static const struct rfkill_ops dell_rfkill_ops = {
 393         .set_block = dell_rfkill_set,
 394         .query = dell_rfkill_query,
 395 };
 396
 397 static struct dentry *dell_laptop_dir;
 398
 399 static int dell_debugfs_show(struct seq_file *s, void *data)
 400 {
 401         int status;
 402
 403         get_buffer();
 404         dell_send_request(buffer, 17, 11);
 405         status = buffer->output[1];
 406         release_buffer();
 407
 408         seq_printf(s, "status:\t0x%X\n", status);
 409         seq_printf(s, "Bit 0 : Hardware switch supported:   %lu\n",
 410                    status & BIT(0));
 411         seq_printf(s, "Bit 1 : Wifi locator supported:      %lu\n",
 412                   (status & BIT(1)) >> 1);
 413         seq_printf(s, "Bit 2 : Wifi is supported:           %lu\n",
 414                   (status & BIT(2)) >> 2);
 415         seq_printf(s, "Bit 3 : Bluetooth is supported:      %lu\n",
 416                   (status & BIT(3)) >> 3);
 417         seq_printf(s, "Bit 4 : WWAN is supported:           %lu\n",
 418                   (status & BIT(4)) >> 4);
 419         seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
 420                   (status & BIT(5)) >> 5);
 421         seq_printf(s, "Bit 8 : Wifi is installed:           %lu\n",
 422                   (status & BIT(8)) >> 8);
 423         seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
 424                   (status & BIT(9)) >> 9);
 425         seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
 426                   (status & BIT(10)) >> 10);
 427         seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
 428                   (status & BIT(16)) >> 16);
 429         seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
 430                   (status & BIT(17)) >> 17);
 431         seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
 432                   (status & BIT(18)) >> 18);
 433         seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
 434                   (status & BIT(19)) >> 19);
 435
 436         seq_printf(s, "\nhwswitch_state:\t0x%X\n", hwswitch_state);
 437         seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
 438                    hwswitch_state & BIT(0));
 439         seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
 440                    (hwswitch_state & BIT(1)) >> 1);
 441         seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
 442                    (hwswitch_state & BIT(2)) >> 2);
 443         seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
 444                    (hwswitch_state & BIT(7)) >> 7);
 445         seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
 446                    (hwswitch_state & BIT(8)) >> 8);
 447         seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
 448                    (hwswitch_state & BIT(15)) >> 15);
 449
 450         return 0;
 451 }
 452
 453 static int dell_debugfs_open(struct inode *inode, struct file *file)
 454 {
 455         return single_open(file, dell_debugfs_show, inode->i_private);
 456 }
 457
 458 static const struct file_operations dell_debugfs_fops = {
 459         .owner = THIS_MODULE,
 460         .open = dell_debugfs_open,
 461         .read = seq_read,
 462         .llseek = seq_lseek,
 463         .release = single_release,
 464 };
 465
 466 static void dell_update_rfkill(struct work_struct *ignored)
 467 {
 468         if (wifi_rfkill)
 469                 dell_rfkill_query(wifi_rfkill, (void *)1);
 470         if (bluetooth_rfkill)
 471                 dell_rfkill_query(bluetooth_rfkill, (void *)2);
 472         if (wwan_rfkill)
 473                 dell_rfkill_query(wwan_rfkill, (void *)3);
 474 }
 475 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
 476
 477
 478 static int __init dell_setup_rfkill(void)
 479 {
 480         int status;
 481         int ret;
 482
 483         if (dmi_check_system(dell_blacklist)) {
 484                 pr_info("Blacklisted hardware detected - not enabling rfkill\n");
 485                 return 0;
 486         }
 487
 488         get_buffer();
 489         dell_send_request(buffer, 17, 11);
 490         status = buffer->output[1];
 491         buffer->input[0] = 0x2;
 492         dell_send_request(buffer, 17, 11);
 493         hwswitch_state = buffer->output[1];
 494         release_buffer();
 495
 496         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 497                 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
 498                                            RFKILL_TYPE_WLAN,
 499                                            &dell_rfkill_ops, (void *) 1);
 500                 if (!wifi_rfkill) {
 501                         ret = -ENOMEM;
 502                         goto err_wifi;
 503                 }
 504                 ret = rfkill_register(wifi_rfkill);
 505                 if (ret)
 506                         goto err_wifi;
 507         }
 508
 509         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 510                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
 511                                                 &platform_device->dev,
 512                                                 RFKILL_TYPE_BLUETOOTH,
 513                                                 &dell_rfkill_ops, (void *) 2);
 514                 if (!bluetooth_rfkill) {
 515                         ret = -ENOMEM;
 516                         goto err_bluetooth;
 517                 }
 518                 ret = rfkill_register(bluetooth_rfkill);
 519                 if (ret)
 520                         goto err_bluetooth;
 521         }
 522
 523         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 524                 wwan_rfkill = rfkill_alloc("dell-wwan",
 525                                            &platform_device->dev,
 526                                            RFKILL_TYPE_WWAN,
 527                                            &dell_rfkill_ops, (void *) 3);
 528                 if (!wwan_rfkill) {
 529                         ret = -ENOMEM;
 530                         goto err_wwan;
 531                 }
 532                 ret = rfkill_register(wwan_rfkill);
 533                 if (ret)
 534                         goto err_wwan;
 535         }
 536
 537         return 0;
 538 err_wwan:
 539         rfkill_destroy(wwan_rfkill);
 540         if (bluetooth_rfkill)
 541                 rfkill_unregister(bluetooth_rfkill);
 542 err_bluetooth:
 543         rfkill_destroy(bluetooth_rfkill);
 544         if (wifi_rfkill)
 545                 rfkill_unregister(wifi_rfkill);
 546 err_wifi:
 547         rfkill_destroy(wifi_rfkill);
 548
 549         return ret;
 550 }
 551
 552 static void dell_cleanup_rfkill(void)
 553 {
 554         if (wifi_rfkill) {
 555                 rfkill_unregister(wifi_rfkill);
 556                 rfkill_destroy(wifi_rfkill);
 557         }
 558         if (bluetooth_rfkill) {
 559                 rfkill_unregister(bluetooth_rfkill);
 560                 rfkill_destroy(bluetooth_rfkill);
 561         }
 562         if (wwan_rfkill) {
 563                 rfkill_unregister(wwan_rfkill);
 564                 rfkill_destroy(wwan_rfkill);
 565         }
 566 }
 567
 568 static int dell_send_intensity(struct backlight_device *bd)
 569 {
 570         int ret = 0;
 571
 572         get_buffer();
 573         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
 574         buffer->input[1] = bd->props.brightness;
 575
 576         if (buffer->input[0] == -1) {
 577                 ret = -ENODEV;
 578                 goto out;
 579         }
 580
 581         if (power_supply_is_system_supplied() > 0)
 582                 dell_send_request(buffer, 1, 2);
 583         else
 584                 dell_send_request(buffer, 1, 1);
 585
 586 out:
 587         release_buffer();
 588         return 0;
 589 }
 590
 591 static int dell_get_intensity(struct backlight_device *bd)
 592 {
 593         int ret = 0;
 594
 595         get_buffer();
 596         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
 597
 598         if (buffer->input[0] == -1) {
 599                 ret = -ENODEV;
 600                 goto out;
 601         }
 602
 603         if (power_supply_is_system_supplied() > 0)
 604                 dell_send_request(buffer, 0, 2);
 605         else
 606                 dell_send_request(buffer, 0, 1);
 607
 608         ret = buffer->output[1];
 609
 610 out:
 611         release_buffer();
 612         return ret;
 613 }
 614
 615 static const struct backlight_ops dell_ops = {
 616         .get_brightness = dell_get_intensity,
 617         .update_status  = dell_send_intensity,
 618 };
 619
 620 static void touchpad_led_on(void)
 621 {
 622         int command = 0x97;
 623         char data = 1;
 624         i8042_command(&data, command | 1 << 12);
 625 }
 626
 627 static void touchpad_led_off(void)
 628 {
 629         int command = 0x97;
 630         char data = 2;
 631         i8042_command(&data, command | 1 << 12);
 632 }
 633
 634 static void touchpad_led_set(struct led_classdev *led_cdev,
 635         enum led_brightness value)
 636 {
 637         if (value > 0)
 638                 touchpad_led_on();
 639         else
 640                 touchpad_led_off();
 641 }
 642
 643 static struct led_classdev touchpad_led = {
 644         .name = "dell-laptop::touchpad",
 645         .brightness_set = touchpad_led_set,
 646         .flags = LED_CORE_SUSPENDRESUME,
 647 };
 648
 649 static int __devinit touchpad_led_init(struct device *dev)
 650 {
 651         return led_classdev_register(dev, &touchpad_led);
 652 }
 653
 654 static void touchpad_led_exit(void)
 655 {
 656         led_classdev_unregister(&touchpad_led);
 657 }
 658
 659 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
 660                               struct serio *port)
 661 {
 662         static bool extended;
 663
 664         if (str & 0x20)
 665                 return false;
 666
 667         if (unlikely(data == 0xe0)) {
 668                 extended = true;
 669                 return false;
 670         } else if (unlikely(extended)) {
 671                 switch (data) {
 672                 case 0x8:
 673                         schedule_delayed_work(&dell_rfkill_work,
 674                                               round_jiffies_relative(HZ));
 675                         break;
 676                 }
 677                 extended = false;
 678         }
 679
 680         return false;
 681 }
 682
 683 static int __init dell_init(void)
 684 {
 685         int max_intensity = 0;
 686         int ret;
 687
 688         if (!dmi_check_system(dell_device_table))
 689                 return -ENODEV;
 690
 691         quirks = NULL;
 692         /* find if this machine support other functions */
 693         dmi_check_system(dell_quirks);
 694
 695         dmi_walk(find_tokens, NULL);
 696
 697         if (!da_tokens)  {
 698                 pr_info("Unable to find dmi tokens\n");
 699                 return -ENODEV;
 700         }
 701
 702         ret = platform_driver_register(&platform_driver);
 703         if (ret)
 704                 goto fail_platform_driver;
 705         platform_device = platform_device_alloc("dell-laptop", -1);
 706         if (!platform_device) {
 707                 ret = -ENOMEM;
 708                 goto fail_platform_device1;
 709         }
 710         ret = platform_device_add(platform_device);
 711         if (ret)
 712                 goto fail_platform_device2;
 713
 714         /*
 715          * Allocate buffer below 4GB for SMI data--only 32-bit physical addr
 716          * is passed to SMI handler.
 717          */
 718         bufferpage = alloc_page(GFP_KERNEL | GFP_DMA32);
 719
 720         if (!bufferpage)
 721                 goto fail_buffer;
 722         buffer = page_address(bufferpage);
 723
 724         ret = dell_setup_rfkill();
 725
 726         if (ret) {
 727                 pr_warn("Unable to setup rfkill\n");
 728                 goto fail_rfkill;
 729         }
 730
 731         ret = i8042_install_filter(dell_laptop_i8042_filter);
 732         if (ret) {
 733                 pr_warn("Unable to install key filter\n");
 734                 goto fail_filter;
 735         }
 736
 737         if (quirks && quirks->touchpad_led)
 738                 touchpad_led_init(&platform_device->dev);
 739
 740         dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
 741         if (dell_laptop_dir != NULL)
 742                 debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
 743                                     &dell_debugfs_fops);
 744
 745 #ifdef CONFIG_ACPI
 746         /* In the event of an ACPI backlight being available, don't
 747          * register the platform controller.
 748          */
 749         if (acpi_video_backlight_support())
 750                 return 0;
 751 #endif
 752
 753         get_buffer();
 754         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
 755         if (buffer->input[0] != -1) {
 756                 dell_send_request(buffer, 0, 2);
 757                 max_intensity = buffer->output[3];
 758         }
 759         release_buffer();
 760
 761         if (max_intensity) {
 762                 struct backlight_properties props;
 763                 memset(&props, 0, sizeof(struct backlight_properties));
 764                 props.type = BACKLIGHT_PLATFORM;
 765                 props.max_brightness = max_intensity;
 766                 dell_backlight_device = backlight_device_register("dell_backlight",
 767                                                                   &platform_device->dev,
 768                                                                   NULL,
 769                                                                   &dell_ops,
 770                                                                   &props);
 771
 772                 if (IS_ERR(dell_backlight_device)) {
 773                         ret = PTR_ERR(dell_backlight_device);
 774                         dell_backlight_device = NULL;
 775                         goto fail_backlight;
 776                 }
 777
 778                 dell_backlight_device->props.brightness =
 779                         dell_get_intensity(dell_backlight_device);
 780                 backlight_update_status(dell_backlight_device);
 781         }
 782
 783         return 0;
 784
 785 fail_backlight:
 786         i8042_remove_filter(dell_laptop_i8042_filter);
 787         cancel_delayed_work_sync(&dell_rfkill_work);
 788 fail_filter:
 789         dell_cleanup_rfkill();
 790 fail_rfkill:
 791         free_page((unsigned long)bufferpage);
 792 fail_buffer:
 793         platform_device_del(platform_device);
 794 fail_platform_device2:
 795         platform_device_put(platform_device);
 796 fail_platform_device1:
 797         platform_driver_unregister(&platform_driver);
 798 fail_platform_driver:
 799         kfree(da_tokens);
 800         return ret;
 801 }
 802
 803 static void __exit dell_exit(void)
 804 {
 805         debugfs_remove_recursive(dell_laptop_dir);
 806         if (quirks && quirks->touchpad_led)
 807                 touchpad_led_exit();
 808         i8042_remove_filter(dell_laptop_i8042_filter);
 809         cancel_delayed_work_sync(&dell_rfkill_work);
 810         backlight_device_unregister(dell_backlight_device);
 811         dell_cleanup_rfkill();
 812         if (platform_device) {
 813                 platform_device_unregister(platform_device);
 814                 platform_driver_unregister(&platform_driver);
 815         }
 816         kfree(da_tokens);
 817         free_page((unsigned long)buffer);
 818 }
 819
 820 module_init(dell_init);
 821 module_exit(dell_exit);
 822
 823 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
 824 MODULE_DESCRIPTION("Dell laptop driver");
 825 MODULE_LICENSE("GPL");
 826 MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");
 827 MODULE_ALIAS("dmi:*svnDellInc.:*:ct9:*");
 828 MODULE_ALIAS("dmi:*svnDellComputerCorporation.:*:ct8:*");