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