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 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/backlight.h>
  19 #include <linux/err.h>
  20 #include <linux/dmi.h>
  21 #include <linux/io.h>
  22 #include <linux/rfkill.h>
  23 #include <linux/power_supply.h>
  24 #include <linux/acpi.h>
  25 #include <linux/mm.h>
  26 #include <linux/i8042.h>
  27 #include <linux/slab.h>
  28 #include <linux/debugfs.h>
  29 #include <linux/seq_file.h>
  30 #include "../../firmware/dcdbas.h"
  31
  32 #define BRIGHTNESS_TOKEN 0x7d
  33
  34 /* This structure will be modified by the firmware when we enter
  35  * system management mode, hence the volatiles */
  36
  37 struct calling_interface_buffer {
  38         u16 class;
  39         u16 select;
  40         volatile u32 input[4];
  41         volatile u32 output[4];
  42 } __packed;
  43
  44 struct calling_interface_token {
  45         u16 tokenID;
  46         u16 location;
  47         union {
  48                 u16 value;
  49                 u16 stringlength;
  50         };
  51 };
  52
  53 struct calling_interface_structure {
  54         struct dmi_header header;
  55         u16 cmdIOAddress;
  56         u8 cmdIOCode;
  57         u32 supportedCmds;
  58         struct calling_interface_token tokens[];
  59 } __packed;
  60
  61 static int da_command_address;
  62 static int da_command_code;
  63 static int da_num_tokens;
  64 static struct calling_interface_token *da_tokens;
  65
  66 static struct platform_driver platform_driver = {
  67         .driver = {
  68                 .name = "dell-laptop",
  69                 .owner = THIS_MODULE,
  70         }
  71 };
  72
  73 static struct platform_device *platform_device;
  74 static struct backlight_device *dell_backlight_device;
  75 static struct rfkill *wifi_rfkill;
  76 static struct rfkill *bluetooth_rfkill;
  77 static struct rfkill *wwan_rfkill;
  78
  79 static const struct dmi_system_id __initdata dell_device_table[] = {
  80         {
  81                 .ident = "Dell laptop",
  82                 .matches = {
  83                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
  84                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
  85                 },
  86         },
  87         {
  88                 .matches = {
  89                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
  90                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
  91                 },
  92         },
  93         {
  94                 .ident = "Dell Computer Corporation",
  95                 .matches = {
  96                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
  97                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
  98                 },
  99         },
 100         { }
 101 };
 102
 103 static struct dmi_system_id __devinitdata dell_blacklist[] = {
 104         /* Supported by compal-laptop */
 105         {
 106                 .ident = "Dell Mini 9",
 107                 .matches = {
 108                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 109                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 910"),
 110                 },
 111         },
 112         {
 113                 .ident = "Dell Mini 10",
 114                 .matches = {
 115                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 116                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1010"),
 117                 },
 118         },
 119         {
 120                 .ident = "Dell Mini 10v",
 121                 .matches = {
 122                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 123                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1011"),
 124                 },
 125         },
 126         {
 127                 .ident = "Dell Mini 1012",
 128                 .matches = {
 129                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 130                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"),
 131                 },
 132         },
 133         {
 134                 .ident = "Dell Inspiron 11z",
 135                 .matches = {
 136                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 137                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1110"),
 138                 },
 139         },
 140         {
 141                 .ident = "Dell Mini 12",
 142                 .matches = {
 143                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 144                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1210"),
 145                 },
 146         },
 147         {}
 148 };
 149
 150 static struct calling_interface_buffer *buffer;
 151 static struct page *bufferpage;
 152 static DEFINE_MUTEX(buffer_mutex);
 153
 154 static int hwswitch_state;
 155
 156 static void get_buffer(void)
 157 {
 158         mutex_lock(&buffer_mutex);
 159         memset(buffer, 0, sizeof(struct calling_interface_buffer));
 160 }
 161
 162 static void release_buffer(void)
 163 {
 164         mutex_unlock(&buffer_mutex);
 165 }
 166
 167 static void __init parse_da_table(const struct dmi_header *dm)
 168 {
 169         /* Final token is a terminator, so we don't want to copy it */
 170         int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
 171         struct calling_interface_structure *table =
 172                 container_of(dm, struct calling_interface_structure, header);
 173
 174         /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
 175            6 bytes of entry */
 176
 177         if (dm->length < 17)
 178                 return;
 179
 180         da_command_address = table->cmdIOAddress;
 181         da_command_code = table->cmdIOCode;
 182
 183         da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
 184                              sizeof(struct calling_interface_token),
 185                              GFP_KERNEL);
 186
 187         if (!da_tokens)
 188                 return;
 189
 190         memcpy(da_tokens+da_num_tokens, table->tokens,
 191                sizeof(struct calling_interface_token) * tokens);
 192
 193         da_num_tokens += tokens;
 194 }
 195
 196 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
 197 {
 198         switch (dm->type) {
 199         case 0xd4: /* Indexed IO */
 200                 break;
 201         case 0xd5: /* Protected Area Type 1 */
 202                 break;
 203         case 0xd6: /* Protected Area Type 2 */
 204                 break;
 205         case 0xda: /* Calling interface */
 206                 parse_da_table(dm);
 207                 break;
 208         }
 209 }
 210
 211 static int find_token_location(int tokenid)
 212 {
 213         int i;
 214         for (i = 0; i < da_num_tokens; i++) {
 215                 if (da_tokens[i].tokenID == tokenid)
 216                         return da_tokens[i].location;
 217         }
 218
 219         return -1;
 220 }
 221
 222 static struct calling_interface_buffer *
 223 dell_send_request(struct calling_interface_buffer *buffer, int class,
 224                   int select)
 225 {
 226         struct smi_cmd command;
 227
 228         command.magic = SMI_CMD_MAGIC;
 229         command.command_address = da_command_address;
 230         command.command_code = da_command_code;
 231         command.ebx = virt_to_phys(buffer);
 232         command.ecx = 0x42534931;
 233
 234         buffer->class = class;
 235         buffer->select = select;
 236
 237         dcdbas_smi_request(&command);
 238
 239         return buffer;
 240 }
 241
 242 /* Derived from information in DellWirelessCtl.cpp:
 243    Class 17, select 11 is radio control. It returns an array of 32-bit values.
 244
 245    Input byte 0 = 0: Wireless information
 246
 247    result[0]: return code
 248    result[1]:
 249      Bit 0:      Hardware switch supported
 250      Bit 1:      Wifi locator supported
 251      Bit 2:      Wifi is supported
 252      Bit 3:      Bluetooth is supported
 253      Bit 4:      WWAN is supported
 254      Bit 5:      Wireless keyboard supported
 255      Bits 6-7:   Reserved
 256      Bit 8:      Wifi is installed
 257      Bit 9:      Bluetooth is installed
 258      Bit 10:     WWAN is installed
 259      Bits 11-15: Reserved
 260      Bit 16:     Hardware switch is on
 261      Bit 17:     Wifi is blocked
 262      Bit 18:     Bluetooth is blocked
 263      Bit 19:     WWAN is blocked
 264      Bits 20-31: Reserved
 265    result[2]: NVRAM size in bytes
 266    result[3]: NVRAM format version number
 267
 268    Input byte 0 = 2: Wireless switch configuration
 269    result[0]: return code
 270    result[1]:
 271      Bit 0:      Wifi controlled by switch
 272      Bit 1:      Bluetooth controlled by switch
 273      Bit 2:      WWAN controlled by switch
 274      Bits 3-6:   Reserved
 275      Bit 7:      Wireless switch config locked
 276      Bit 8:      Wifi locator enabled
 277      Bits 9-14:  Reserved
 278      Bit 15:     Wifi locator setting locked
 279      Bits 16-31: Reserved
 280 */
 281
 282 static int dell_rfkill_set(void *data, bool blocked)
 283 {
 284         int disable = blocked ? 1 : 0;
 285         unsigned long radio = (unsigned long)data;
 286         int hwswitch_bit = (unsigned long)data - 1;
 287         int ret = 0;
 288
 289         get_buffer();
 290         dell_send_request(buffer, 17, 11);
 291
 292         /* If the hardware switch controls this radio, and the hardware
 293            switch is disabled, don't allow changing the software state */
 294         if ((hwswitch_state & BIT(hwswitch_bit)) &&
 295             !(buffer->output[1] & BIT(16))) {
 296                 ret = -EINVAL;
 297                 goto out;
 298         }
 299
 300         buffer->input[0] = (1 | (radio<<8) | (disable << 16));
 301         dell_send_request(buffer, 17, 11);
 302
 303 out:
 304         release_buffer();
 305         return ret;
 306 }
 307
 308 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 309 {
 310         int status;
 311         int bit = (unsigned long)data + 16;
 312         int hwswitch_bit = (unsigned long)data - 1;
 313
 314         get_buffer();
 315         dell_send_request(buffer, 17, 11);
 316         status = buffer->output[1];
 317         release_buffer();
 318
 319         rfkill_set_sw_state(rfkill, !!(status & BIT(bit)));
 320
 321         if (hwswitch_state & (BIT(hwswitch_bit)))
 322                 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
 323 }
 324
 325 static const struct rfkill_ops dell_rfkill_ops = {
 326         .set_block = dell_rfkill_set,
 327         .query = dell_rfkill_query,
 328 };
 329
 330 static struct dentry *dell_laptop_dir;
 331
 332 static int dell_debugfs_show(struct seq_file *s, void *data)
 333 {
 334         int status;
 335
 336         get_buffer();
 337         dell_send_request(buffer, 17, 11);
 338         status = buffer->output[1];
 339         release_buffer();
 340
 341         seq_printf(s, "status:\t0x%X\n", status);
 342         seq_printf(s, "Bit 0 : Hardware switch supported:   %lu\n",
 343                    status & BIT(0));
 344         seq_printf(s, "Bit 1 : Wifi locator supported:      %lu\n",
 345                   (status & BIT(1)) >> 1);
 346         seq_printf(s, "Bit 2 : Wifi is supported:           %lu\n",
 347                   (status & BIT(2)) >> 2);
 348         seq_printf(s, "Bit 3 : Bluetooth is supported:      %lu\n",
 349                   (status & BIT(3)) >> 3);
 350         seq_printf(s, "Bit 4 : WWAN is supported:           %lu\n",
 351                   (status & BIT(4)) >> 4);
 352         seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
 353                   (status & BIT(5)) >> 5);
 354         seq_printf(s, "Bit 8 : Wifi is installed:           %lu\n",
 355                   (status & BIT(8)) >> 8);
 356         seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
 357                   (status & BIT(9)) >> 9);
 358         seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
 359                   (status & BIT(10)) >> 10);
 360         seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
 361                   (status & BIT(16)) >> 16);
 362         seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
 363                   (status & BIT(17)) >> 17);
 364         seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
 365                   (status & BIT(18)) >> 18);
 366         seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
 367                   (status & BIT(19)) >> 19);
 368
 369         seq_printf(s, "\nhwswitch_state:\t0x%X\n", hwswitch_state);
 370         seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
 371                    hwswitch_state & BIT(0));
 372         seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
 373                    (hwswitch_state & BIT(1)) >> 1);
 374         seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
 375                    (hwswitch_state & BIT(2)) >> 2);
 376         seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
 377                    (hwswitch_state & BIT(7)) >> 7);
 378         seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
 379                    (hwswitch_state & BIT(8)) >> 8);
 380         seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
 381                    (hwswitch_state & BIT(15)) >> 15);
 382
 383         return 0;
 384 }
 385
 386 static int dell_debugfs_open(struct inode *inode, struct file *file)
 387 {
 388         return single_open(file, dell_debugfs_show, inode->i_private);
 389 }
 390
 391 static const struct file_operations dell_debugfs_fops = {
 392         .owner = THIS_MODULE,
 393         .open = dell_debugfs_open,
 394         .read = seq_read,
 395         .llseek = seq_lseek,
 396         .release = single_release,
 397 };
 398
 399 static void dell_update_rfkill(struct work_struct *ignored)
 400 {
 401         if (wifi_rfkill)
 402                 dell_rfkill_query(wifi_rfkill, (void *)1);
 403         if (bluetooth_rfkill)
 404                 dell_rfkill_query(bluetooth_rfkill, (void *)2);
 405         if (wwan_rfkill)
 406                 dell_rfkill_query(wwan_rfkill, (void *)3);
 407 }
 408 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
 409
 410
 411 static int __init dell_setup_rfkill(void)
 412 {
 413         int status;
 414         int ret;
 415
 416         if (dmi_check_system(dell_blacklist)) {
 417                 printk(KERN_INFO "dell-laptop: Blacklisted hardware detected - "
 418                                 "not enabling rfkill\n");
 419                 return 0;
 420         }
 421
 422         get_buffer();
 423         dell_send_request(buffer, 17, 11);
 424         status = buffer->output[1];
 425         buffer->input[0] = 0x2;
 426         dell_send_request(buffer, 17, 11);
 427         hwswitch_state = buffer->output[1];
 428         release_buffer();
 429
 430         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 431                 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
 432                                            RFKILL_TYPE_WLAN,
 433                                            &dell_rfkill_ops, (void *) 1);
 434                 if (!wifi_rfkill) {
 435                         ret = -ENOMEM;
 436                         goto err_wifi;
 437                 }
 438                 ret = rfkill_register(wifi_rfkill);
 439                 if (ret)
 440                         goto err_wifi;
 441         }
 442
 443         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 444                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
 445                                                 &platform_device->dev,
 446                                                 RFKILL_TYPE_BLUETOOTH,
 447                                                 &dell_rfkill_ops, (void *) 2);
 448                 if (!bluetooth_rfkill) {
 449                         ret = -ENOMEM;
 450                         goto err_bluetooth;
 451                 }
 452                 ret = rfkill_register(bluetooth_rfkill);
 453                 if (ret)
 454                         goto err_bluetooth;
 455         }
 456
 457         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 458                 wwan_rfkill = rfkill_alloc("dell-wwan",
 459                                            &platform_device->dev,
 460                                            RFKILL_TYPE_WWAN,
 461                                            &dell_rfkill_ops, (void *) 3);
 462                 if (!wwan_rfkill) {
 463                         ret = -ENOMEM;
 464                         goto err_wwan;
 465                 }
 466                 ret = rfkill_register(wwan_rfkill);
 467                 if (ret)
 468                         goto err_wwan;
 469         }
 470
 471         return 0;
 472 err_wwan:
 473         rfkill_destroy(wwan_rfkill);
 474         if (bluetooth_rfkill)
 475                 rfkill_unregister(bluetooth_rfkill);
 476 err_bluetooth:
 477         rfkill_destroy(bluetooth_rfkill);
 478         if (wifi_rfkill)
 479                 rfkill_unregister(wifi_rfkill);
 480 err_wifi:
 481         rfkill_destroy(wifi_rfkill);
 482
 483         return ret;
 484 }
 485
 486 static void dell_cleanup_rfkill(void)
 487 {
 488         if (wifi_rfkill) {
 489                 rfkill_unregister(wifi_rfkill);
 490                 rfkill_destroy(wifi_rfkill);
 491         }
 492         if (bluetooth_rfkill) {
 493                 rfkill_unregister(bluetooth_rfkill);
 494                 rfkill_destroy(bluetooth_rfkill);
 495         }
 496         if (wwan_rfkill) {
 497                 rfkill_unregister(wwan_rfkill);
 498                 rfkill_destroy(wwan_rfkill);
 499         }
 500 }
 501
 502 static int dell_send_intensity(struct backlight_device *bd)
 503 {
 504         int ret = 0;
 505
 506         get_buffer();
 507         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
 508         buffer->input[1] = bd->props.brightness;
 509
 510         if (buffer->input[0] == -1) {
 511                 ret = -ENODEV;
 512                 goto out;
 513         }
 514
 515         if (power_supply_is_system_supplied() > 0)
 516                 dell_send_request(buffer, 1, 2);
 517         else
 518                 dell_send_request(buffer, 1, 1);
 519
 520 out:
 521         release_buffer();
 522         return 0;
 523 }
 524
 525 static int dell_get_intensity(struct backlight_device *bd)
 526 {
 527         int ret = 0;
 528
 529         get_buffer();
 530         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
 531
 532         if (buffer->input[0] == -1) {
 533                 ret = -ENODEV;
 534                 goto out;
 535         }
 536
 537         if (power_supply_is_system_supplied() > 0)
 538                 dell_send_request(buffer, 0, 2);
 539         else
 540                 dell_send_request(buffer, 0, 1);
 541
 542 out:
 543         release_buffer();
 544         if (ret)
 545                 return ret;
 546         return buffer->output[1];
 547 }
 548
 549 static const struct backlight_ops dell_ops = {
 550         .get_brightness = dell_get_intensity,
 551         .update_status  = dell_send_intensity,
 552 };
 553
 554 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
 555                               struct serio *port)
 556 {
 557         static bool extended;
 558
 559         if (str & 0x20)
 560                 return false;
 561
 562         if (unlikely(data == 0xe0)) {
 563                 extended = true;
 564                 return false;
 565         } else if (unlikely(extended)) {
 566                 switch (data) {
 567                 case 0x8:
 568                         schedule_delayed_work(&dell_rfkill_work,
 569                                               round_jiffies_relative(HZ));
 570                         break;
 571                 }
 572                 extended = false;
 573         }
 574
 575         return false;
 576 }
 577
 578 static int __init dell_init(void)
 579 {
 580         int max_intensity = 0;
 581         int ret;
 582
 583         if (!dmi_check_system(dell_device_table))
 584                 return -ENODEV;
 585
 586         dmi_walk(find_tokens, NULL);
 587
 588         if (!da_tokens)  {
 589                 printk(KERN_INFO "dell-laptop: Unable to find dmi tokens\n");
 590                 return -ENODEV;
 591         }
 592
 593         ret = platform_driver_register(&platform_driver);
 594         if (ret)
 595                 goto fail_platform_driver;
 596         platform_device = platform_device_alloc("dell-laptop", -1);
 597         if (!platform_device) {
 598                 ret = -ENOMEM;
 599                 goto fail_platform_device1;
 600         }
 601         ret = platform_device_add(platform_device);
 602         if (ret)
 603                 goto fail_platform_device2;
 604
 605         /*
 606          * Allocate buffer below 4GB for SMI data--only 32-bit physical addr
 607          * is passed to SMI handler.
 608          */
 609         bufferpage = alloc_page(GFP_KERNEL | GFP_DMA32);
 610
 611         if (!bufferpage)
 612                 goto fail_buffer;
 613         buffer = page_address(bufferpage);
 614         mutex_init(&buffer_mutex);
 615
 616         ret = dell_setup_rfkill();
 617
 618         if (ret) {
 619                 printk(KERN_WARNING "dell-laptop: Unable to setup rfkill\n");
 620                 goto fail_rfkill;
 621         }
 622
 623         ret = i8042_install_filter(dell_laptop_i8042_filter);
 624         if (ret) {
 625                 printk(KERN_WARNING
 626                        "dell-laptop: Unable to install key filter\n");
 627                 goto fail_filter;
 628         }
 629
 630         dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
 631         if (dell_laptop_dir != NULL)
 632                 debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
 633                                     &dell_debugfs_fops);
 634
 635 #ifdef CONFIG_ACPI
 636         /* In the event of an ACPI backlight being available, don't
 637          * register the platform controller.
 638          */
 639         if (acpi_video_backlight_support())
 640                 return 0;
 641 #endif
 642
 643         get_buffer();
 644         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
 645         if (buffer->input[0] != -1) {
 646                 dell_send_request(buffer, 0, 2);
 647                 max_intensity = buffer->output[3];
 648         }
 649         release_buffer();
 650
 651         if (max_intensity) {
 652                 struct backlight_properties props;
 653                 memset(&props, 0, sizeof(struct backlight_properties));
 654                 props.max_brightness = max_intensity;
 655                 dell_backlight_device = backlight_device_register("dell_backlight",
 656                                                                   &platform_device->dev,
 657                                                                   NULL,
 658                                                                   &dell_ops,
 659                                                                   &props);
 660
 661                 if (IS_ERR(dell_backlight_device)) {
 662                         ret = PTR_ERR(dell_backlight_device);
 663                         dell_backlight_device = NULL;
 664                         goto fail_backlight;
 665                 }
 666
 667                 dell_backlight_device->props.brightness =
 668                         dell_get_intensity(dell_backlight_device);
 669                 backlight_update_status(dell_backlight_device);
 670         }
 671
 672         return 0;
 673
 674 fail_backlight:
 675         i8042_remove_filter(dell_laptop_i8042_filter);
 676         cancel_delayed_work_sync(&dell_rfkill_work);
 677 fail_filter:
 678         dell_cleanup_rfkill();
 679 fail_rfkill:
 680         free_page((unsigned long)bufferpage);
 681 fail_buffer:
 682         platform_device_del(platform_device);
 683 fail_platform_device2:
 684         platform_device_put(platform_device);
 685 fail_platform_device1:
 686         platform_driver_unregister(&platform_driver);
 687 fail_platform_driver:
 688         kfree(da_tokens);
 689         return ret;
 690 }
 691
 692 static void __exit dell_exit(void)
 693 {
 694         debugfs_remove_recursive(dell_laptop_dir);
 695         i8042_remove_filter(dell_laptop_i8042_filter);
 696         cancel_delayed_work_sync(&dell_rfkill_work);
 697         backlight_device_unregister(dell_backlight_device);
 698         dell_cleanup_rfkill();
 699         if (platform_device) {
 700                 platform_device_unregister(platform_device);
 701                 platform_driver_unregister(&platform_driver);
 702         }
 703         kfree(da_tokens);
 704         free_page((unsigned long)buffer);
 705 }
 706
 707 module_init(dell_init);
 708 module_exit(dell_exit);
 709
 710 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
 711 MODULE_DESCRIPTION("Dell laptop driver");
 712 MODULE_LICENSE("GPL");
 713 MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");
 714 MODULE_ALIAS("dmi:*svnDellInc.:*:ct9:*");
 715 MODULE_ALIAS("dmi:*svnDellComputerCorporation.:*:ct8:*");