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