Pileus Git - ~andy/linux/blob - 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 dell_device_table[] __initconst = {
  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 dell_quirks[] = {
 123         {
 124                 .callback = dmi_matched,
 125                 .ident = "Dell Vostro V130",
 126                 .matches = {
 127                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 128                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
 129                 },
 130                 .driver_data = &quirk_dell_vostro_v130,
 131         },
 132         {
 133                 .callback = dmi_matched,
 134                 .ident = "Dell Vostro V131",
 135                 .matches = {
 136                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 137                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 138                 },
 139                 .driver_data = &quirk_dell_vostro_v130,
 140         },
 141         {
 142                 .callback = dmi_matched,
 143                 .ident = "Dell Vostro 3350",
 144                 .matches = {
 145                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 146                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
 147                 },
 148                 .driver_data = &quirk_dell_vostro_v130,
 149         },
 150         {
 151                 .callback = dmi_matched,
 152                 .ident = "Dell Vostro 3555",
 153                 .matches = {
 154                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 155                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
 156                 },
 157                 .driver_data = &quirk_dell_vostro_v130,
 158         },
 159         {
 160                 .callback = dmi_matched,
 161                 .ident = "Dell Inspiron N311z",
 162                 .matches = {
 163                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 164                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
 165                 },
 166                 .driver_data = &quirk_dell_vostro_v130,
 167         },
 168         {
 169                 .callback = dmi_matched,
 170                 .ident = "Dell Inspiron M5110",
 171                 .matches = {
 172                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 173                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
 174                 },
 175                 .driver_data = &quirk_dell_vostro_v130,
 176         },
 177         {
 178                 .callback = dmi_matched,
 179                 .ident = "Dell Vostro 3360",
 180                 .matches = {
 181                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 182                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
 183                 },
 184                 .driver_data = &quirk_dell_vostro_v130,
 185         },
 186         {
 187                 .callback = dmi_matched,
 188                 .ident = "Dell Vostro 3460",
 189                 .matches = {
 190                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 191                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"),
 192                 },
 193                 .driver_data = &quirk_dell_vostro_v130,
 194         },
 195         {
 196                 .callback = dmi_matched,
 197                 .ident = "Dell Vostro 3560",
 198                 .matches = {
 199                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 200                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"),
 201                 },
 202                 .driver_data = &quirk_dell_vostro_v130,
 203         },
 204         {
 205                 .callback = dmi_matched,
 206                 .ident = "Dell Vostro 3450",
 207                 .matches = {
 208                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 209                         DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"),
 210                 },
 211                 .driver_data = &quirk_dell_vostro_v130,
 212         },
 213         {
 214                 .callback = dmi_matched,
 215                 .ident = "Dell Inspiron 5420",
 216                 .matches = {
 217                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 218                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"),
 219                 },
 220                 .driver_data = &quirk_dell_vostro_v130,
 221         },
 222         {
 223                 .callback = dmi_matched,
 224                 .ident = "Dell Inspiron 5520",
 225                 .matches = {
 226                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 227                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"),
 228                 },
 229                 .driver_data = &quirk_dell_vostro_v130,
 230         },
 231         {
 232                 .callback = dmi_matched,
 233                 .ident = "Dell Inspiron 5720",
 234                 .matches = {
 235                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 236                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"),
 237                 },
 238                 .driver_data = &quirk_dell_vostro_v130,
 239         },
 240         {
 241                 .callback = dmi_matched,
 242                 .ident = "Dell Inspiron 7420",
 243                 .matches = {
 244                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 245                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"),
 246                 },
 247                 .driver_data = &quirk_dell_vostro_v130,
 248         },
 249         {
 250                 .callback = dmi_matched,
 251                 .ident = "Dell Inspiron 7520",
 252                 .matches = {
 253                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 254                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
 255                 },
 256                 .driver_data = &quirk_dell_vostro_v130,
 257         },
 258         {
 259                 .callback = dmi_matched,
 260                 .ident = "Dell Inspiron 7720",
 261                 .matches = {
 262                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 263                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
 264                 },
 265                 .driver_data = &quirk_dell_vostro_v130,
 266         },
 267         { }
 268 };
 269
 270 static struct calling_interface_buffer *buffer;
 271 static struct page *bufferpage;
 272 static DEFINE_MUTEX(buffer_mutex);
 273
 274 static int hwswitch_state;
 275
 276 static void get_buffer(void)
 277 {
 278         mutex_lock(&buffer_mutex);
 279         memset(buffer, 0, sizeof(struct calling_interface_buffer));
 280 }
 281
 282 static void release_buffer(void)
 283 {
 284         mutex_unlock(&buffer_mutex);
 285 }
 286
 287 static void __init parse_da_table(const struct dmi_header *dm)
 288 {
 289         /* Final token is a terminator, so we don't want to copy it */
 290         int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
 291         struct calling_interface_token *new_da_tokens;
 292         struct calling_interface_structure *table =
 293                 container_of(dm, struct calling_interface_structure, header);
 294
 295         /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
 296            6 bytes of entry */
 297
 298         if (dm->length < 17)
 299                 return;
 300
 301         da_command_address = table->cmdIOAddress;
 302         da_command_code = table->cmdIOCode;
 303
 304         new_da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
 305                                  sizeof(struct calling_interface_token),
 306                                  GFP_KERNEL);
 307
 308         if (!new_da_tokens)
 309                 return;
 310         da_tokens = new_da_tokens;
 311
 312         memcpy(da_tokens+da_num_tokens, table->tokens,
 313                sizeof(struct calling_interface_token) * tokens);
 314
 315         da_num_tokens += tokens;
 316 }
 317
 318 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
 319 {
 320         switch (dm->type) {
 321         case 0xd4: /* Indexed IO */
 322         case 0xd5: /* Protected Area Type 1 */
 323         case 0xd6: /* Protected Area Type 2 */
 324                 break;
 325         case 0xda: /* Calling interface */
 326                 parse_da_table(dm);
 327                 break;
 328         }
 329 }
 330
 331 static int find_token_location(int tokenid)
 332 {
 333         int i;
 334         for (i = 0; i < da_num_tokens; i++) {
 335                 if (da_tokens[i].tokenID == tokenid)
 336                         return da_tokens[i].location;
 337         }
 338
 339         return -1;
 340 }
 341
 342 static struct calling_interface_buffer *
 343 dell_send_request(struct calling_interface_buffer *buffer, int class,
 344                   int select)
 345 {
 346         struct smi_cmd command;
 347
 348         command.magic = SMI_CMD_MAGIC;
 349         command.command_address = da_command_address;
 350         command.command_code = da_command_code;
 351         command.ebx = virt_to_phys(buffer);
 352         command.ecx = 0x42534931;
 353
 354         buffer->class = class;
 355         buffer->select = select;
 356
 357         dcdbas_smi_request(&command);
 358
 359         return buffer;
 360 }
 361
 362 /* Derived from information in DellWirelessCtl.cpp:
 363    Class 17, select 11 is radio control. It returns an array of 32-bit values.
 364
 365    Input byte 0 = 0: Wireless information
 366
 367    result[0]: return code
 368    result[1]:
 369      Bit 0:      Hardware switch supported
 370      Bit 1:      Wifi locator supported
 371      Bit 2:      Wifi is supported
 372      Bit 3:      Bluetooth is supported
 373      Bit 4:      WWAN is supported
 374      Bit 5:      Wireless keyboard supported
 375      Bits 6-7:   Reserved
 376      Bit 8:      Wifi is installed
 377      Bit 9:      Bluetooth is installed
 378      Bit 10:     WWAN is installed
 379      Bits 11-15: Reserved
 380      Bit 16:     Hardware switch is on
 381      Bit 17:     Wifi is blocked
 382      Bit 18:     Bluetooth is blocked
 383      Bit 19:     WWAN is blocked
 384      Bits 20-31: Reserved
 385    result[2]: NVRAM size in bytes
 386    result[3]: NVRAM format version number
 387
 388    Input byte 0 = 2: Wireless switch configuration
 389    result[0]: return code
 390    result[1]:
 391      Bit 0:      Wifi controlled by switch
 392      Bit 1:      Bluetooth controlled by switch
 393      Bit 2:      WWAN controlled by switch
 394      Bits 3-6:   Reserved
 395      Bit 7:      Wireless switch config locked
 396      Bit 8:      Wifi locator enabled
 397      Bits 9-14:  Reserved
 398      Bit 15:     Wifi locator setting locked
 399      Bits 16-31: Reserved
 400 */
 401
 402 static int dell_rfkill_set(void *data, bool blocked)
 403 {
 404         int disable = blocked ? 1 : 0;
 405         unsigned long radio = (unsigned long)data;
 406         int hwswitch_bit = (unsigned long)data - 1;
 407         int ret = 0;
 408
 409         get_buffer();
 410         dell_send_request(buffer, 17, 11);
 411
 412         /* If the hardware switch controls this radio, and the hardware
 413            switch is disabled, don't allow changing the software state */
 414         if ((hwswitch_state & BIT(hwswitch_bit)) &&
 415             !(buffer->output[1] & BIT(16))) {
 416                 ret = -EINVAL;
 417                 goto out;
 418         }
 419
 420         buffer->input[0] = (1 | (radio<<8) | (disable << 16));
 421         dell_send_request(buffer, 17, 11);
 422
 423 out:
 424         release_buffer();
 425         return ret;
 426 }
 427
 428 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 429 {
 430         int status;
 431         int bit = (unsigned long)data + 16;
 432         int hwswitch_bit = (unsigned long)data - 1;
 433
 434         get_buffer();
 435         dell_send_request(buffer, 17, 11);
 436         status = buffer->output[1];
 437         release_buffer();
 438
 439         rfkill_set_sw_state(rfkill, !!(status & BIT(bit)));
 440
 441         if (hwswitch_state & (BIT(hwswitch_bit)))
 442                 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
 443 }
 444
 445 static const struct rfkill_ops dell_rfkill_ops = {
 446         .set_block = dell_rfkill_set,
 447         .query = dell_rfkill_query,
 448 };
 449
 450 static struct dentry *dell_laptop_dir;
 451
 452 static int dell_debugfs_show(struct seq_file *s, void *data)
 453 {
 454         int status;
 455
 456         get_buffer();
 457         dell_send_request(buffer, 17, 11);
 458         status = buffer->output[1];
 459         release_buffer();
 460
 461         seq_printf(s, "status:\t0x%X\n", status);
 462         seq_printf(s, "Bit 0 : Hardware switch supported:   %lu\n",
 463                    status & BIT(0));
 464         seq_printf(s, "Bit 1 : Wifi locator supported:      %lu\n",
 465                   (status & BIT(1)) >> 1);
 466         seq_printf(s, "Bit 2 : Wifi is supported:           %lu\n",
 467                   (status & BIT(2)) >> 2);
 468         seq_printf(s, "Bit 3 : Bluetooth is supported:      %lu\n",
 469                   (status & BIT(3)) >> 3);
 470         seq_printf(s, "Bit 4 : WWAN is supported:           %lu\n",
 471                   (status & BIT(4)) >> 4);
 472         seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
 473                   (status & BIT(5)) >> 5);
 474         seq_printf(s, "Bit 8 : Wifi is installed:           %lu\n",
 475                   (status & BIT(8)) >> 8);
 476         seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
 477                   (status & BIT(9)) >> 9);
 478         seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
 479                   (status & BIT(10)) >> 10);
 480         seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
 481                   (status & BIT(16)) >> 16);
 482         seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
 483                   (status & BIT(17)) >> 17);
 484         seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
 485                   (status & BIT(18)) >> 18);
 486         seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
 487                   (status & BIT(19)) >> 19);
 488
 489         seq_printf(s, "\nhwswitch_state:\t0x%X\n", hwswitch_state);
 490         seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
 491                    hwswitch_state & BIT(0));
 492         seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
 493                    (hwswitch_state & BIT(1)) >> 1);
 494         seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
 495                    (hwswitch_state & BIT(2)) >> 2);
 496         seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
 497                    (hwswitch_state & BIT(7)) >> 7);
 498         seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
 499                    (hwswitch_state & BIT(8)) >> 8);
 500         seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
 501                    (hwswitch_state & BIT(15)) >> 15);
 502
 503         return 0;
 504 }
 505
 506 static int dell_debugfs_open(struct inode *inode, struct file *file)
 507 {
 508         return single_open(file, dell_debugfs_show, inode->i_private);
 509 }
 510
 511 static const struct file_operations dell_debugfs_fops = {
 512         .owner = THIS_MODULE,
 513         .open = dell_debugfs_open,
 514         .read = seq_read,
 515         .llseek = seq_lseek,
 516         .release = single_release,
 517 };
 518
 519 static void dell_update_rfkill(struct work_struct *ignored)
 520 {
 521         if (wifi_rfkill)
 522                 dell_rfkill_query(wifi_rfkill, (void *)1);
 523         if (bluetooth_rfkill)
 524                 dell_rfkill_query(bluetooth_rfkill, (void *)2);
 525         if (wwan_rfkill)
 526                 dell_rfkill_query(wwan_rfkill, (void *)3);
 527 }
 528 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
 529
 530
 531 static int __init dell_setup_rfkill(void)
 532 {
 533         int status;
 534         int ret;
 535         const char *product;
 536
 537         /*
 538          * rfkill causes trouble on various non Latitudes, according to Dell
 539          * actually testing the rfkill functionality is only done on Latitudes.
 540          */
 541         product = dmi_get_system_info(DMI_PRODUCT_NAME);
 542         if (!product || strncmp(product, "Latitude", 8))
 543                 return 0;
 544
 545         get_buffer();
 546         dell_send_request(buffer, 17, 11);
 547         status = buffer->output[1];
 548         buffer->input[0] = 0x2;
 549         dell_send_request(buffer, 17, 11);
 550         hwswitch_state = buffer->output[1];
 551         release_buffer();
 552
 553         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 554                 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
 555                                            RFKILL_TYPE_WLAN,
 556                                            &dell_rfkill_ops, (void *) 1);
 557                 if (!wifi_rfkill) {
 558                         ret = -ENOMEM;
 559                         goto err_wifi;
 560                 }
 561                 ret = rfkill_register(wifi_rfkill);
 562                 if (ret)
 563                         goto err_wifi;
 564         }
 565
 566         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 567                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
 568                                                 &platform_device->dev,
 569                                                 RFKILL_TYPE_BLUETOOTH,
 570                                                 &dell_rfkill_ops, (void *) 2);
 571                 if (!bluetooth_rfkill) {
 572                         ret = -ENOMEM;
 573                         goto err_bluetooth;
 574                 }
 575                 ret = rfkill_register(bluetooth_rfkill);
 576                 if (ret)
 577                         goto err_bluetooth;
 578         }
 579
 580         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 581                 wwan_rfkill = rfkill_alloc("dell-wwan",
 582                                            &platform_device->dev,
 583                                            RFKILL_TYPE_WWAN,
 584                                            &dell_rfkill_ops, (void *) 3);
 585                 if (!wwan_rfkill) {
 586                         ret = -ENOMEM;
 587                         goto err_wwan;
 588                 }
 589                 ret = rfkill_register(wwan_rfkill);
 590                 if (ret)
 591                         goto err_wwan;
 592         }
 593
 594         return 0;
 595 err_wwan:
 596         rfkill_destroy(wwan_rfkill);
 597         if (bluetooth_rfkill)
 598                 rfkill_unregister(bluetooth_rfkill);
 599 err_bluetooth:
 600         rfkill_destroy(bluetooth_rfkill);
 601         if (wifi_rfkill)
 602                 rfkill_unregister(wifi_rfkill);
 603 err_wifi:
 604         rfkill_destroy(wifi_rfkill);
 605
 606         return ret;
 607 }
 608
 609 static void dell_cleanup_rfkill(void)
 610 {
 611         if (wifi_rfkill) {
 612                 rfkill_unregister(wifi_rfkill);
 613                 rfkill_destroy(wifi_rfkill);
 614         }
 615         if (bluetooth_rfkill) {
 616                 rfkill_unregister(bluetooth_rfkill);
 617                 rfkill_destroy(bluetooth_rfkill);
 618         }
 619         if (wwan_rfkill) {
 620                 rfkill_unregister(wwan_rfkill);
 621                 rfkill_destroy(wwan_rfkill);
 622         }
 623 }
 624
 625 static int dell_send_intensity(struct backlight_device *bd)
 626 {
 627         int ret = 0;
 628
 629         get_buffer();
 630         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
 631         buffer->input[1] = bd->props.brightness;
 632
 633         if (buffer->input[0] == -1) {
 634                 ret = -ENODEV;
 635                 goto out;
 636         }
 637
 638         if (power_supply_is_system_supplied() > 0)
 639                 dell_send_request(buffer, 1, 2);
 640         else
 641                 dell_send_request(buffer, 1, 1);
 642
 643 out:
 644         release_buffer();
 645         return 0;
 646 }
 647
 648 static int dell_get_intensity(struct backlight_device *bd)
 649 {
 650         int ret = 0;
 651
 652         get_buffer();
 653         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
 654
 655         if (buffer->input[0] == -1) {
 656                 ret = -ENODEV;
 657                 goto out;
 658         }
 659
 660         if (power_supply_is_system_supplied() > 0)
 661                 dell_send_request(buffer, 0, 2);
 662         else
 663                 dell_send_request(buffer, 0, 1);
 664
 665         ret = buffer->output[1];
 666
 667 out:
 668         release_buffer();
 669         return ret;
 670 }
 671
 672 static const struct backlight_ops dell_ops = {
 673         .get_brightness = dell_get_intensity,
 674         .update_status  = dell_send_intensity,
 675 };
 676
 677 static void touchpad_led_on(void)
 678 {
 679         int command = 0x97;
 680         char data = 1;
 681         i8042_command(&data, command | 1 << 12);
 682 }
 683
 684 static void touchpad_led_off(void)
 685 {
 686         int command = 0x97;
 687         char data = 2;
 688         i8042_command(&data, command | 1 << 12);
 689 }
 690
 691 static void touchpad_led_set(struct led_classdev *led_cdev,
 692         enum led_brightness value)
 693 {
 694         if (value > 0)
 695                 touchpad_led_on();
 696         else
 697                 touchpad_led_off();
 698 }
 699
 700 static struct led_classdev touchpad_led = {
 701         .name = "dell-laptop::touchpad",
 702         .brightness_set = touchpad_led_set,
 703         .flags = LED_CORE_SUSPENDRESUME,
 704 };
 705
 706 static int touchpad_led_init(struct device *dev)
 707 {
 708         return led_classdev_register(dev, &touchpad_led);
 709 }
 710
 711 static void touchpad_led_exit(void)
 712 {
 713         led_classdev_unregister(&touchpad_led);
 714 }
 715
 716 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
 717                               struct serio *port)
 718 {
 719         static bool extended;
 720
 721         if (str & 0x20)
 722                 return false;
 723
 724         if (unlikely(data == 0xe0)) {
 725                 extended = true;
 726                 return false;
 727         } else if (unlikely(extended)) {
 728                 switch (data) {
 729                 case 0x8:
 730                         schedule_delayed_work(&dell_rfkill_work,
 731                                               round_jiffies_relative(HZ));
 732                         break;
 733                 }
 734                 extended = false;
 735         }
 736
 737         return false;
 738 }
 739
 740 static int __init dell_init(void)
 741 {
 742         int max_intensity = 0;
 743         int ret;
 744
 745         if (!dmi_check_system(dell_device_table))
 746                 return -ENODEV;
 747
 748         quirks = NULL;
 749         /* find if this machine support other functions */
 750         dmi_check_system(dell_quirks);
 751
 752         dmi_walk(find_tokens, NULL);
 753
 754         if (!da_tokens)  {
 755                 pr_info("Unable to find dmi tokens\n");
 756                 return -ENODEV;
 757         }
 758
 759         ret = platform_driver_register(&platform_driver);
 760         if (ret)
 761                 goto fail_platform_driver;
 762         platform_device = platform_device_alloc("dell-laptop", -1);
 763         if (!platform_device) {
 764                 ret = -ENOMEM;
 765                 goto fail_platform_device1;
 766         }
 767         ret = platform_device_add(platform_device);
 768         if (ret)
 769                 goto fail_platform_device2;
 770
 771         /*
 772          * Allocate buffer below 4GB for SMI data--only 32-bit physical addr
 773          * is passed to SMI handler.
 774          */
 775         bufferpage = alloc_page(GFP_KERNEL | GFP_DMA32);
 776         if (!bufferpage) {
 777                 ret = -ENOMEM;
 778                 goto fail_buffer;
 779         }
 780         buffer = page_address(bufferpage);
 781
 782         ret = dell_setup_rfkill();
 783
 784         if (ret) {
 785                 pr_warn("Unable to setup rfkill\n");
 786                 goto fail_rfkill;
 787         }
 788
 789         ret = i8042_install_filter(dell_laptop_i8042_filter);
 790         if (ret) {
 791                 pr_warn("Unable to install key filter\n");
 792                 goto fail_filter;
 793         }
 794
 795         if (quirks && quirks->touchpad_led)
 796                 touchpad_led_init(&platform_device->dev);
 797
 798         dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
 799         if (dell_laptop_dir != NULL)
 800                 debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
 801                                     &dell_debugfs_fops);
 802
 803 #ifdef CONFIG_ACPI
 804         /* In the event of an ACPI backlight being available, don't
 805          * register the platform controller.
 806          */
 807         if (acpi_video_backlight_support())
 808                 return 0;
 809 #endif
 810
 811         get_buffer();
 812         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
 813         if (buffer->input[0] != -1) {
 814                 dell_send_request(buffer, 0, 2);
 815                 max_intensity = buffer->output[3];
 816         }
 817         release_buffer();
 818
 819         if (max_intensity) {
 820                 struct backlight_properties props;
 821                 memset(&props, 0, sizeof(struct backlight_properties));
 822                 props.type = BACKLIGHT_PLATFORM;
 823                 props.max_brightness = max_intensity;
 824                 dell_backlight_device = backlight_device_register("dell_backlight",
 825                                                                   &platform_device->dev,
 826                                                                   NULL,
 827                                                                   &dell_ops,
 828                                                                   &props);
 829
 830                 if (IS_ERR(dell_backlight_device)) {
 831                         ret = PTR_ERR(dell_backlight_device);
 832                         dell_backlight_device = NULL;
 833                         goto fail_backlight;
 834                 }
 835
 836                 dell_backlight_device->props.brightness =
 837                         dell_get_intensity(dell_backlight_device);
 838                 backlight_update_status(dell_backlight_device);
 839         }
 840
 841         return 0;
 842
 843 fail_backlight:
 844         i8042_remove_filter(dell_laptop_i8042_filter);
 845         cancel_delayed_work_sync(&dell_rfkill_work);
 846 fail_filter:
 847         dell_cleanup_rfkill();
 848 fail_rfkill:
 849         free_page((unsigned long)bufferpage);
 850 fail_buffer:
 851         platform_device_del(platform_device);
 852 fail_platform_device2:
 853         platform_device_put(platform_device);
 854 fail_platform_device1:
 855         platform_driver_unregister(&platform_driver);
 856 fail_platform_driver:
 857         kfree(da_tokens);
 858         return ret;
 859 }
 860
 861 static void __exit dell_exit(void)
 862 {
 863         debugfs_remove_recursive(dell_laptop_dir);
 864         if (quirks && quirks->touchpad_led)
 865                 touchpad_led_exit();
 866         i8042_remove_filter(dell_laptop_i8042_filter);
 867         cancel_delayed_work_sync(&dell_rfkill_work);
 868         backlight_device_unregister(dell_backlight_device);
 869         dell_cleanup_rfkill();
 870         if (platform_device) {
 871                 platform_device_unregister(platform_device);
 872                 platform_driver_unregister(&platform_driver);
 873         }
 874         kfree(da_tokens);
 875         free_page((unsigned long)buffer);
 876 }
 877
 878 module_init(dell_init);
 879 module_exit(dell_exit);
 880
 881 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
 882 MODULE_DESCRIPTION("Dell laptop driver");
 883 MODULE_LICENSE("GPL");