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