drivers/platform/x86/samsung-laptop.c

   1 /*
   2  * Samsung Laptop driver
   3  *
   4  * Copyright (C) 2009,2011 Greg Kroah-Hartman (gregkh@suse.de)
   5  * Copyright (C) 2009,2011 Novell Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  *
  11  */
  12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  13
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/delay.h>
  18 #include <linux/pci.h>
  19 #include <linux/backlight.h>
  20 #include <linux/leds.h>
  21 #include <linux/fb.h>
  22 #include <linux/dmi.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/rfkill.h>
  25 #include <linux/acpi.h>
  26 #include <linux/seq_file.h>
  27 #include <linux/debugfs.h>
  28 #include <linux/ctype.h>
  29 #include <linux/efi.h>
  30 #include <linux/suspend.h>
  31 #include <acpi/video.h>
  32
  33 /*
  34  * This driver is needed because a number of Samsung laptops do not hook
  35  * their control settings through ACPI.  So we have to poke around in the
  36  * BIOS to do things like brightness values, and "special" key controls.
  37  */
  38
  39 /*
  40  * We have 0 - 8 as valid brightness levels.  The specs say that level 0 should
  41  * be reserved by the BIOS (which really doesn't make much sense), we tell
  42  * userspace that the value is 0 - 7 and then just tell the hardware 1 - 8
  43  */
  44 #define MAX_BRIGHT      0x07
  45
  46
  47 #define SABI_IFACE_MAIN                 0x00
  48 #define SABI_IFACE_SUB                  0x02
  49 #define SABI_IFACE_COMPLETE             0x04
  50 #define SABI_IFACE_DATA                 0x05
  51
  52 #define WL_STATUS_WLAN                  0x0
  53 #define WL_STATUS_BT                    0x2
  54
  55 /* Structure get/set data using sabi */
  56 struct sabi_data {
  57         union {
  58                 struct {
  59                         u32 d0;
  60                         u32 d1;
  61                         u16 d2;
  62                         u8  d3;
  63                 };
  64                 u8 data[11];
  65         };
  66 };
  67
  68 struct sabi_header_offsets {
  69         u8 port;
  70         u8 re_mem;
  71         u8 iface_func;
  72         u8 en_mem;
  73         u8 data_offset;
  74         u8 data_segment;
  75 };
  76
  77 struct sabi_commands {
  78         /*
  79          * Brightness is 0 - 8, as described above.
  80          * Value 0 is for the BIOS to use
  81          */
  82         u16 get_brightness;
  83         u16 set_brightness;
  84
  85         /*
  86          * first byte:
  87          * 0x00 - wireless is off
  88          * 0x01 - wireless is on
  89          * second byte:
  90          * 0x02 - 3G is off
  91          * 0x03 - 3G is on
  92          * TODO, verify 3G is correct, that doesn't seem right...
  93          */
  94         u16 get_wireless_button;
  95         u16 set_wireless_button;
  96
  97         /* 0 is off, 1 is on */
  98         u16 get_backlight;
  99         u16 set_backlight;
 100
 101         /*
 102          * 0x80 or 0x00 - no action
 103          * 0x81 - recovery key pressed
 104          */
 105         u16 get_recovery_mode;
 106         u16 set_recovery_mode;
 107
 108         /*
 109          * on seclinux: 0 is low, 1 is high,
 110          * on swsmi: 0 is normal, 1 is silent, 2 is turbo
 111          */
 112         u16 get_performance_level;
 113         u16 set_performance_level;
 114
 115         /* 0x80 is off, 0x81 is on */
 116         u16 get_battery_life_extender;
 117         u16 set_battery_life_extender;
 118
 119         /* 0x80 is off, 0x81 is on */
 120         u16 get_usb_charge;
 121         u16 set_usb_charge;
 122
 123         /* the first byte is for bluetooth and the third one is for wlan */
 124         u16 get_wireless_status;
 125         u16 set_wireless_status;
 126
 127         /* 0x81 to read, (0x82 | level << 8) to set, 0xaabb to enable */
 128         u16 kbd_backlight;
 129
 130         /*
 131          * Tell the BIOS that Linux is running on this machine.
 132          * 81 is on, 80 is off
 133          */
 134         u16 set_linux;
 135 };
 136
 137 struct sabi_performance_level {
 138         const char *name;
 139         u16 value;
 140 };
 141
 142 struct sabi_config {
 143         int sabi_version;
 144         const char *test_string;
 145         u16 main_function;
 146         const struct sabi_header_offsets header_offsets;
 147         const struct sabi_commands commands;
 148         const struct sabi_performance_level performance_levels[4];
 149         u8 min_brightness;
 150         u8 max_brightness;
 151 };
 152
 153 static const struct sabi_config sabi_configs[] = {
 154         {
 155                 /* I don't know if it is really 2, but it it is
 156                  * less than 3 anyway */
 157                 .sabi_version = 2,
 158
 159                 .test_string = "SECLINUX",
 160
 161                 .main_function = 0x4c49,
 162
 163                 .header_offsets = {
 164                         .port = 0x00,
 165                         .re_mem = 0x02,
 166                         .iface_func = 0x03,
 167                         .en_mem = 0x04,
 168                         .data_offset = 0x05,
 169                         .data_segment = 0x07,
 170                 },
 171
 172                 .commands = {
 173                         .get_brightness = 0x00,
 174                         .set_brightness = 0x01,
 175
 176                         .get_wireless_button = 0x02,
 177                         .set_wireless_button = 0x03,
 178
 179                         .get_backlight = 0x04,
 180                         .set_backlight = 0x05,
 181
 182                         .get_recovery_mode = 0x06,
 183                         .set_recovery_mode = 0x07,
 184
 185                         .get_performance_level = 0x08,
 186                         .set_performance_level = 0x09,
 187
 188                         .get_battery_life_extender = 0xFFFF,
 189                         .set_battery_life_extender = 0xFFFF,
 190
 191                         .get_usb_charge = 0xFFFF,
 192                         .set_usb_charge = 0xFFFF,
 193
 194                         .get_wireless_status = 0xFFFF,
 195                         .set_wireless_status = 0xFFFF,
 196
 197                         .kbd_backlight = 0xFFFF,
 198
 199                         .set_linux = 0x0a,
 200                 },
 201
 202                 .performance_levels = {
 203                         {
 204                                 .name = "silent",
 205                                 .value = 0,
 206                         },
 207                         {
 208                                 .name = "normal",
 209                                 .value = 1,
 210                         },
 211                         { },
 212                 },
 213                 .min_brightness = 1,
 214                 .max_brightness = 8,
 215         },
 216         {
 217                 .sabi_version = 3,
 218
 219                 .test_string = "SwSmi@",
 220
 221                 .main_function = 0x5843,
 222
 223                 .header_offsets = {
 224                         .port = 0x00,
 225                         .re_mem = 0x04,
 226                         .iface_func = 0x02,
 227                         .en_mem = 0x03,
 228                         .data_offset = 0x05,
 229                         .data_segment = 0x07,
 230                 },
 231
 232                 .commands = {
 233                         .get_brightness = 0x10,
 234                         .set_brightness = 0x11,
 235
 236                         .get_wireless_button = 0x12,
 237                         .set_wireless_button = 0x13,
 238
 239                         .get_backlight = 0x2d,
 240                         .set_backlight = 0x2e,
 241
 242                         .get_recovery_mode = 0xff,
 243                         .set_recovery_mode = 0xff,
 244
 245                         .get_performance_level = 0x31,
 246                         .set_performance_level = 0x32,
 247
 248                         .get_battery_life_extender = 0x65,
 249                         .set_battery_life_extender = 0x66,
 250
 251                         .get_usb_charge = 0x67,
 252                         .set_usb_charge = 0x68,
 253
 254                         .get_wireless_status = 0x69,
 255                         .set_wireless_status = 0x6a,
 256
 257                         .kbd_backlight = 0x78,
 258
 259                         .set_linux = 0xff,
 260                 },
 261
 262                 .performance_levels = {
 263                         {
 264                                 .name = "normal",
 265                                 .value = 0,
 266                         },
 267                         {
 268                                 .name = "silent",
 269                                 .value = 1,
 270                         },
 271                         {
 272                                 .name = "overclock",
 273                                 .value = 2,
 274                         },
 275                         { },
 276                 },
 277                 .min_brightness = 0,
 278                 .max_brightness = 8,
 279         },
 280         { },
 281 };
 282
 283 /*
 284  * samsung-laptop/    - debugfs root directory
 285  *   f0000_segment    - dump f0000 segment
 286  *   command          - current command
 287  *   data             - current data
 288  *   d0, d1, d2, d3   - data fields
 289  *   call             - call SABI using command and data
 290  *
 291  * This allow to call arbitrary sabi commands wihout
 292  * modifying the driver at all.
 293  * For example, setting the keyboard backlight brightness to 5
 294  *
 295  *  echo 0x78 > command
 296  *  echo 0x0582 > d0
 297  *  echo 0 > d1
 298  *  echo 0 > d2
 299  *  echo 0 > d3
 300  *  cat call
 301  */
 302
 303 struct samsung_laptop_debug {
 304         struct dentry *root;
 305         struct sabi_data data;
 306         u16 command;
 307
 308         struct debugfs_blob_wrapper f0000_wrapper;
 309         struct debugfs_blob_wrapper data_wrapper;
 310         struct debugfs_blob_wrapper sdiag_wrapper;
 311 };
 312
 313 struct samsung_laptop;
 314
 315 struct samsung_rfkill {
 316         struct samsung_laptop *samsung;
 317         struct rfkill *rfkill;
 318         enum rfkill_type type;
 319 };
 320
 321 struct samsung_laptop {
 322         const struct sabi_config *config;
 323
 324         void __iomem *sabi;
 325         void __iomem *sabi_iface;
 326         void __iomem *f0000_segment;
 327
 328         struct mutex sabi_mutex;
 329
 330         struct platform_device *platform_device;
 331         struct backlight_device *backlight_device;
 332
 333         struct samsung_rfkill wlan;
 334         struct samsung_rfkill bluetooth;
 335
 336         struct led_classdev kbd_led;
 337         int kbd_led_wk;
 338         struct workqueue_struct *led_workqueue;
 339         struct work_struct kbd_led_work;
 340
 341         struct samsung_laptop_debug debug;
 342         struct samsung_quirks *quirks;
 343
 344         struct notifier_block pm_nb;
 345
 346         bool handle_backlight;
 347         bool has_stepping_quirk;
 348
 349         char sdiag[64];
 350 };
 351
 352 struct samsung_quirks {
 353         bool broken_acpi_video;
 354         bool four_kbd_backlight_levels;
 355         bool enable_kbd_backlight;
 356         bool use_native_backlight;
 357 };
 358
 359 static struct samsung_quirks samsung_unknown = {};
 360
 361 static struct samsung_quirks samsung_broken_acpi_video = {
 362         .broken_acpi_video = true,
 363 };
 364
 365 static struct samsung_quirks samsung_use_native_backlight = {
 366         .use_native_backlight = true,
 367 };
 368
 369 static struct samsung_quirks samsung_np740u3e = {
 370         .four_kbd_backlight_levels = true,
 371         .enable_kbd_backlight = true,
 372 };
 373
 374 static bool force;
 375 module_param(force, bool, 0);
 376 MODULE_PARM_DESC(force,
 377                 "Disable the DMI check and forces the driver to be loaded");
 378
 379 static bool debug;
 380 module_param(debug, bool, S_IRUGO | S_IWUSR);
 381 MODULE_PARM_DESC(debug, "Debug enabled or not");
 382
 383 static int sabi_command(struct samsung_laptop *samsung, u16 command,
 384                         struct sabi_data *in,
 385                         struct sabi_data *out)
 386 {
 387         const struct sabi_config *config = samsung->config;
 388         int ret = 0;
 389         u16 port = readw(samsung->sabi + config->header_offsets.port);
 390         u8 complete, iface_data;
 391
 392         mutex_lock(&samsung->sabi_mutex);
 393
 394         if (debug) {
 395                 if (in)
 396                         pr_info("SABI command:0x%04x "
 397                                 "data:{0x%08x, 0x%08x, 0x%04x, 0x%02x}",
 398                                 command, in->d0, in->d1, in->d2, in->d3);
 399                 else
 400                         pr_info("SABI command:0x%04x", command);
 401         }
 402
 403         /* enable memory to be able to write to it */
 404         outb(readb(samsung->sabi + config->header_offsets.en_mem), port);
 405
 406         /* write out the command */
 407         writew(config->main_function, samsung->sabi_iface + SABI_IFACE_MAIN);
 408         writew(command, samsung->sabi_iface + SABI_IFACE_SUB);
 409         writeb(0, samsung->sabi_iface + SABI_IFACE_COMPLETE);
 410         if (in) {
 411                 writel(in->d0, samsung->sabi_iface + SABI_IFACE_DATA);
 412                 writel(in->d1, samsung->sabi_iface + SABI_IFACE_DATA + 4);
 413                 writew(in->d2, samsung->sabi_iface + SABI_IFACE_DATA + 8);
 414                 writeb(in->d3, samsung->sabi_iface + SABI_IFACE_DATA + 10);
 415         }
 416         outb(readb(samsung->sabi + config->header_offsets.iface_func), port);
 417
 418         /* write protect memory to make it safe */
 419         outb(readb(samsung->sabi + config->header_offsets.re_mem), port);
 420
 421         /* see if the command actually succeeded */
 422         complete = readb(samsung->sabi_iface + SABI_IFACE_COMPLETE);
 423         iface_data = readb(samsung->sabi_iface + SABI_IFACE_DATA);
 424
 425         /* iface_data = 0xFF happens when a command is not known
 426          * so we only add a warning in debug mode since we will
 427          * probably issue some unknown command at startup to find
 428          * out which features are supported */
 429         if (complete != 0xaa || (iface_data == 0xff && debug))
 430                 pr_warn("SABI command 0x%04x failed with"
 431                         " completion flag 0x%02x and interface data 0x%02x",
 432                         command, complete, iface_data);
 433
 434         if (complete != 0xaa || iface_data == 0xff) {
 435                 ret = -EINVAL;
 436                 goto exit;
 437         }
 438
 439         if (out) {
 440                 out->d0 = readl(samsung->sabi_iface + SABI_IFACE_DATA);
 441                 out->d1 = readl(samsung->sabi_iface + SABI_IFACE_DATA + 4);
 442                 out->d2 = readw(samsung->sabi_iface + SABI_IFACE_DATA + 2);
 443                 out->d3 = readb(samsung->sabi_iface + SABI_IFACE_DATA + 1);
 444         }
 445
 446         if (debug && out) {
 447                 pr_info("SABI return data:{0x%08x, 0x%08x, 0x%04x, 0x%02x}",
 448                         out->d0, out->d1, out->d2, out->d3);
 449         }
 450
 451 exit:
 452         mutex_unlock(&samsung->sabi_mutex);
 453         return ret;
 454 }
 455
 456 /* simple wrappers usable with most commands */
 457 static int sabi_set_commandb(struct samsung_laptop *samsung,
 458                              u16 command, u8 data)
 459 {
 460         struct sabi_data in = { { { .d0 = 0, .d1 = 0, .d2 = 0, .d3 = 0 } } };
 461
 462         in.data[0] = data;
 463         return sabi_command(samsung, command, &in, NULL);
 464 }
 465
 466 static int read_brightness(struct samsung_laptop *samsung)
 467 {
 468         const struct sabi_config *config = samsung->config;
 469         const struct sabi_commands *commands = &samsung->config->commands;
 470         struct sabi_data sretval;
 471         int user_brightness = 0;
 472         int retval;
 473
 474         retval = sabi_command(samsung, commands->get_brightness,
 475                               NULL, &sretval);
 476         if (retval)
 477                 return retval;
 478
 479         user_brightness = sretval.data[0];
 480         if (user_brightness > config->min_brightness)
 481                 user_brightness -= config->min_brightness;
 482         else
 483                 user_brightness = 0;
 484
 485         return user_brightness;
 486 }
 487
 488 static void set_brightness(struct samsung_laptop *samsung, u8 user_brightness)
 489 {
 490         const struct sabi_config *config = samsung->config;
 491         const struct sabi_commands *commands = &samsung->config->commands;
 492         u8 user_level = user_brightness + config->min_brightness;
 493
 494         if (samsung->has_stepping_quirk && user_level != 0) {
 495                 /*
 496                  * short circuit if the specified level is what's already set
 497                  * to prevent the screen from flickering needlessly
 498                  */
 499                 if (user_brightness == read_brightness(samsung))
 500                         return;
 501
 502                 sabi_set_commandb(samsung, commands->set_brightness, 0);
 503         }
 504
 505         sabi_set_commandb(samsung, commands->set_brightness, user_level);
 506 }
 507
 508 static int get_brightness(struct backlight_device *bd)
 509 {
 510         struct samsung_laptop *samsung = bl_get_data(bd);
 511
 512         return read_brightness(samsung);
 513 }
 514
 515 static void check_for_stepping_quirk(struct samsung_laptop *samsung)
 516 {
 517         int initial_level;
 518         int check_level;
 519         int orig_level = read_brightness(samsung);
 520
 521         /*
 522          * Some laptops exhibit the strange behaviour of stepping toward
 523          * (rather than setting) the brightness except when changing to/from
 524          * brightness level 0. This behaviour is checked for here and worked
 525          * around in set_brightness.
 526          */
 527
 528         if (orig_level == 0)
 529                 set_brightness(samsung, 1);
 530
 531         initial_level = read_brightness(samsung);
 532
 533         if (initial_level <= 2)
 534                 check_level = initial_level + 2;
 535         else
 536                 check_level = initial_level - 2;
 537
 538         samsung->has_stepping_quirk = false;
 539         set_brightness(samsung, check_level);
 540
 541         if (read_brightness(samsung) != check_level) {
 542                 samsung->has_stepping_quirk = true;
 543                 pr_info("enabled workaround for brightness stepping quirk\n");
 544         }
 545
 546         set_brightness(samsung, orig_level);
 547 }
 548
 549 static int update_status(struct backlight_device *bd)
 550 {
 551         struct samsung_laptop *samsung = bl_get_data(bd);
 552         const struct sabi_commands *commands = &samsung->config->commands;
 553
 554         set_brightness(samsung, bd->props.brightness);
 555
 556         if (bd->props.power == FB_BLANK_UNBLANK)
 557                 sabi_set_commandb(samsung, commands->set_backlight, 1);
 558         else
 559                 sabi_set_commandb(samsung, commands->set_backlight, 0);
 560
 561         return 0;
 562 }
 563
 564 static const struct backlight_ops backlight_ops = {
 565         .get_brightness = get_brightness,
 566         .update_status  = update_status,
 567 };
 568
 569 static int seclinux_rfkill_set(void *data, bool blocked)
 570 {
 571         struct samsung_rfkill *srfkill = data;
 572         struct samsung_laptop *samsung = srfkill->samsung;
 573         const struct sabi_commands *commands = &samsung->config->commands;
 574
 575         return sabi_set_commandb(samsung, commands->set_wireless_button,
 576                                  !blocked);
 577 }
 578
 579 static struct rfkill_ops seclinux_rfkill_ops = {
 580         .set_block = seclinux_rfkill_set,
 581 };
 582
 583 static int swsmi_wireless_status(struct samsung_laptop *samsung,
 584                                  struct sabi_data *data)
 585 {
 586         const struct sabi_commands *commands = &samsung->config->commands;
 587
 588         return sabi_command(samsung, commands->get_wireless_status,
 589                             NULL, data);
 590 }
 591
 592 static int swsmi_rfkill_set(void *priv, bool blocked)
 593 {
 594         struct samsung_rfkill *srfkill = priv;
 595         struct samsung_laptop *samsung = srfkill->samsung;
 596         const struct sabi_commands *commands = &samsung->config->commands;
 597         struct sabi_data data;
 598         int ret, i;
 599
 600         ret = swsmi_wireless_status(samsung, &data);
 601         if (ret)
 602                 return ret;
 603
 604         /* Don't set the state for non-present devices */
 605         for (i = 0; i < 4; i++)
 606                 if (data.data[i] == 0x02)
 607                         data.data[1] = 0;
 608
 609         if (srfkill->type == RFKILL_TYPE_WLAN)
 610                 data.data[WL_STATUS_WLAN] = !blocked;
 611         else if (srfkill->type == RFKILL_TYPE_BLUETOOTH)
 612                 data.data[WL_STATUS_BT] = !blocked;
 613
 614         return sabi_command(samsung, commands->set_wireless_status,
 615                             &data, &data);
 616 }
 617
 618 static void swsmi_rfkill_query(struct rfkill *rfkill, void *priv)
 619 {
 620         struct samsung_rfkill *srfkill = priv;
 621         struct samsung_laptop *samsung = srfkill->samsung;
 622         struct sabi_data data;
 623         int ret;
 624
 625         ret = swsmi_wireless_status(samsung, &data);
 626         if (ret)
 627                 return ;
 628
 629         if (srfkill->type == RFKILL_TYPE_WLAN)
 630                 ret = data.data[WL_STATUS_WLAN];
 631         else if (srfkill->type == RFKILL_TYPE_BLUETOOTH)
 632                 ret = data.data[WL_STATUS_BT];
 633         else
 634                 return ;
 635
 636         rfkill_set_sw_state(rfkill, !ret);
 637 }
 638
 639 static struct rfkill_ops swsmi_rfkill_ops = {
 640         .set_block = swsmi_rfkill_set,
 641         .query = swsmi_rfkill_query,
 642 };
 643
 644 static ssize_t get_performance_level(struct device *dev,
 645                                      struct device_attribute *attr, char *buf)
 646 {
 647         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 648         const struct sabi_config *config = samsung->config;
 649         const struct sabi_commands *commands = &config->commands;
 650         struct sabi_data sretval;
 651         int retval;
 652         int i;
 653
 654         /* Read the state */
 655         retval = sabi_command(samsung, commands->get_performance_level,
 656                               NULL, &sretval);
 657         if (retval)
 658                 return retval;
 659
 660         /* The logic is backwards, yeah, lots of fun... */
 661         for (i = 0; config->performance_levels[i].name; ++i) {
 662                 if (sretval.data[0] == config->performance_levels[i].value)
 663                         return sprintf(buf, "%s\n", config->performance_levels[i].name);
 664         }
 665         return sprintf(buf, "%s\n", "unknown");
 666 }
 667
 668 static ssize_t set_performance_level(struct device *dev,
 669                                 struct device_attribute *attr, const char *buf,
 670                                 size_t count)
 671 {
 672         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 673         const struct sabi_config *config = samsung->config;
 674         const struct sabi_commands *commands = &config->commands;
 675         int i;
 676
 677         if (count < 1)
 678                 return count;
 679
 680         for (i = 0; config->performance_levels[i].name; ++i) {
 681                 const struct sabi_performance_level *level =
 682                         &config->performance_levels[i];
 683                 if (!strncasecmp(level->name, buf, strlen(level->name))) {
 684                         sabi_set_commandb(samsung,
 685                                           commands->set_performance_level,
 686                                           level->value);
 687                         break;
 688                 }
 689         }
 690
 691         if (!config->performance_levels[i].name)
 692                 return -EINVAL;
 693
 694         return count;
 695 }
 696
 697 static DEVICE_ATTR(performance_level, S_IWUSR | S_IRUGO,
 698                    get_performance_level, set_performance_level);
 699
 700 static int read_battery_life_extender(struct samsung_laptop *samsung)
 701 {
 702         const struct sabi_commands *commands = &samsung->config->commands;
 703         struct sabi_data data;
 704         int retval;
 705
 706         if (commands->get_battery_life_extender == 0xFFFF)
 707                 return -ENODEV;
 708
 709         memset(&data, 0, sizeof(data));
 710         data.data[0] = 0x80;
 711         retval = sabi_command(samsung, commands->get_battery_life_extender,
 712                               &data, &data);
 713
 714         if (retval)
 715                 return retval;
 716
 717         if (data.data[0] != 0 && data.data[0] != 1)
 718                 return -ENODEV;
 719
 720         return data.data[0];
 721 }
 722
 723 static int write_battery_life_extender(struct samsung_laptop *samsung,
 724                                        int enabled)
 725 {
 726         const struct sabi_commands *commands = &samsung->config->commands;
 727         struct sabi_data data;
 728
 729         memset(&data, 0, sizeof(data));
 730         data.data[0] = 0x80 | enabled;
 731         return sabi_command(samsung, commands->set_battery_life_extender,
 732                             &data, NULL);
 733 }
 734
 735 static ssize_t get_battery_life_extender(struct device *dev,
 736                                          struct device_attribute *attr,
 737                                          char *buf)
 738 {
 739         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 740         int ret;
 741
 742         ret = read_battery_life_extender(samsung);
 743         if (ret < 0)
 744                 return ret;
 745
 746         return sprintf(buf, "%d\n", ret);
 747 }
 748
 749 static ssize_t set_battery_life_extender(struct device *dev,
 750                                         struct device_attribute *attr,
 751                                         const char *buf, size_t count)
 752 {
 753         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 754         int ret, value;
 755
 756         if (!count || sscanf(buf, "%i", &value) != 1)
 757                 return -EINVAL;
 758
 759         ret = write_battery_life_extender(samsung, !!value);
 760         if (ret < 0)
 761                 return ret;
 762
 763         return count;
 764 }
 765
 766 static DEVICE_ATTR(battery_life_extender, S_IWUSR | S_IRUGO,
 767                    get_battery_life_extender, set_battery_life_extender);
 768
 769 static int read_usb_charge(struct samsung_laptop *samsung)
 770 {
 771         const struct sabi_commands *commands = &samsung->config->commands;
 772         struct sabi_data data;
 773         int retval;
 774
 775         if (commands->get_usb_charge == 0xFFFF)
 776                 return -ENODEV;
 777
 778         memset(&data, 0, sizeof(data));
 779         data.data[0] = 0x80;
 780         retval = sabi_command(samsung, commands->get_usb_charge,
 781                               &data, &data);
 782
 783         if (retval)
 784                 return retval;
 785
 786         if (data.data[0] != 0 && data.data[0] != 1)
 787                 return -ENODEV;
 788
 789         return data.data[0];
 790 }
 791
 792 static int write_usb_charge(struct samsung_laptop *samsung,
 793                             int enabled)
 794 {
 795         const struct sabi_commands *commands = &samsung->config->commands;
 796         struct sabi_data data;
 797
 798         memset(&data, 0, sizeof(data));
 799         data.data[0] = 0x80 | enabled;
 800         return sabi_command(samsung, commands->set_usb_charge,
 801                             &data, NULL);
 802 }
 803
 804 static ssize_t get_usb_charge(struct device *dev,
 805                               struct device_attribute *attr,
 806                               char *buf)
 807 {
 808         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 809         int ret;
 810
 811         ret = read_usb_charge(samsung);
 812         if (ret < 0)
 813                 return ret;
 814
 815         return sprintf(buf, "%d\n", ret);
 816 }
 817
 818 static ssize_t set_usb_charge(struct device *dev,
 819                               struct device_attribute *attr,
 820                               const char *buf, size_t count)
 821 {
 822         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 823         int ret, value;
 824
 825         if (!count || sscanf(buf, "%i", &value) != 1)
 826                 return -EINVAL;
 827
 828         ret = write_usb_charge(samsung, !!value);
 829         if (ret < 0)
 830                 return ret;
 831
 832         return count;
 833 }
 834
 835 static DEVICE_ATTR(usb_charge, S_IWUSR | S_IRUGO,
 836                    get_usb_charge, set_usb_charge);
 837
 838 static struct attribute *platform_attributes[] = {
 839         &dev_attr_performance_level.attr,
 840         &dev_attr_battery_life_extender.attr,
 841         &dev_attr_usb_charge.attr,
 842         NULL
 843 };
 844
 845 static int find_signature(void __iomem *memcheck, const char *testStr)
 846 {
 847         int i = 0;
 848         int loca;
 849
 850         for (loca = 0; loca < 0xffff; loca++) {
 851                 char temp = readb(memcheck + loca);
 852
 853                 if (temp == testStr[i]) {
 854                         if (i == strlen(testStr)-1)
 855                                 break;
 856                         ++i;
 857                 } else {
 858                         i = 0;
 859                 }
 860         }
 861         return loca;
 862 }
 863
 864 static void samsung_rfkill_exit(struct samsung_laptop *samsung)
 865 {
 866         if (samsung->wlan.rfkill) {
 867                 rfkill_unregister(samsung->wlan.rfkill);
 868                 rfkill_destroy(samsung->wlan.rfkill);
 869                 samsung->wlan.rfkill = NULL;
 870         }
 871         if (samsung->bluetooth.rfkill) {
 872                 rfkill_unregister(samsung->bluetooth.rfkill);
 873                 rfkill_destroy(samsung->bluetooth.rfkill);
 874                 samsung->bluetooth.rfkill = NULL;
 875         }
 876 }
 877
 878 static int samsung_new_rfkill(struct samsung_laptop *samsung,
 879                               struct samsung_rfkill *arfkill,
 880                               const char *name, enum rfkill_type type,
 881                               const struct rfkill_ops *ops,
 882                               int blocked)
 883 {
 884         struct rfkill **rfkill = &arfkill->rfkill;
 885         int ret;
 886
 887         arfkill->type = type;
 888         arfkill->samsung = samsung;
 889
 890         *rfkill = rfkill_alloc(name, &samsung->platform_device->dev,
 891                                type, ops, arfkill);
 892
 893         if (!*rfkill)
 894                 return -EINVAL;
 895
 896         if (blocked != -1)
 897                 rfkill_init_sw_state(*rfkill, blocked);
 898
 899         ret = rfkill_register(*rfkill);
 900         if (ret) {
 901                 rfkill_destroy(*rfkill);
 902                 *rfkill = NULL;
 903                 return ret;
 904         }
 905         return 0;
 906 }
 907
 908 static int __init samsung_rfkill_init_seclinux(struct samsung_laptop *samsung)
 909 {
 910         return samsung_new_rfkill(samsung, &samsung->wlan, "samsung-wlan",
 911                                   RFKILL_TYPE_WLAN, &seclinux_rfkill_ops, -1);
 912 }
 913
 914 static int __init samsung_rfkill_init_swsmi(struct samsung_laptop *samsung)
 915 {
 916         struct sabi_data data;
 917         int ret;
 918
 919         ret = swsmi_wireless_status(samsung, &data);
 920         if (ret) {
 921                 /* Some swsmi laptops use the old seclinux way to control
 922                  * wireless devices */
 923                 if (ret == -EINVAL)
 924                         ret = samsung_rfkill_init_seclinux(samsung);
 925                 return ret;
 926         }
 927
 928         /* 0x02 seems to mean that the device is no present/available */
 929
 930         if (data.data[WL_STATUS_WLAN] != 0x02)
 931                 ret = samsung_new_rfkill(samsung, &samsung->wlan,
 932                                          "samsung-wlan",
 933                                          RFKILL_TYPE_WLAN,
 934                                          &swsmi_rfkill_ops,
 935                                          !data.data[WL_STATUS_WLAN]);
 936         if (ret)
 937                 goto exit;
 938
 939         if (data.data[WL_STATUS_BT] != 0x02)
 940                 ret = samsung_new_rfkill(samsung, &samsung->bluetooth,
 941                                          "samsung-bluetooth",
 942                                          RFKILL_TYPE_BLUETOOTH,
 943                                          &swsmi_rfkill_ops,
 944                                          !data.data[WL_STATUS_BT]);
 945         if (ret)
 946                 goto exit;
 947
 948 exit:
 949         if (ret)
 950                 samsung_rfkill_exit(samsung);
 951
 952         return ret;
 953 }
 954
 955 static int __init samsung_rfkill_init(struct samsung_laptop *samsung)
 956 {
 957         if (samsung->config->sabi_version == 2)
 958                 return samsung_rfkill_init_seclinux(samsung);
 959         if (samsung->config->sabi_version == 3)
 960                 return samsung_rfkill_init_swsmi(samsung);
 961         return 0;
 962 }
 963
 964 static int kbd_backlight_enable(struct samsung_laptop *samsung)
 965 {
 966         const struct sabi_commands *commands = &samsung->config->commands;
 967         struct sabi_data data;
 968         int retval;
 969
 970         if (commands->kbd_backlight == 0xFFFF)
 971                 return -ENODEV;
 972
 973         memset(&data, 0, sizeof(data));
 974         data.d0 = 0xaabb;
 975         retval = sabi_command(samsung, commands->kbd_backlight,
 976                               &data, &data);
 977
 978         if (retval)
 979                 return retval;
 980
 981         if (data.d0 != 0xccdd)
 982                 return -ENODEV;
 983         return 0;
 984 }
 985
 986 static int kbd_backlight_read(struct samsung_laptop *samsung)
 987 {
 988         const struct sabi_commands *commands = &samsung->config->commands;
 989         struct sabi_data data;
 990         int retval;
 991
 992         memset(&data, 0, sizeof(data));
 993         data.data[0] = 0x81;
 994         retval = sabi_command(samsung, commands->kbd_backlight,
 995                               &data, &data);
 996
 997         if (retval)
 998                 return retval;
 999
1000         return data.data[0];
1001 }
1002
1003 static int kbd_backlight_write(struct samsung_laptop *samsung, int brightness)
1004 {
1005         const struct sabi_commands *commands = &samsung->config->commands;
1006         struct sabi_data data;
1007
1008         memset(&data, 0, sizeof(data));
1009         data.d0 = 0x82 | ((brightness & 0xFF) << 8);
1010         return sabi_command(samsung, commands->kbd_backlight,
1011                             &data, NULL);
1012 }
1013
1014 static void kbd_led_update(struct work_struct *work)
1015 {
1016         struct samsung_laptop *samsung;
1017
1018         samsung = container_of(work, struct samsung_laptop, kbd_led_work);
1019         kbd_backlight_write(samsung, samsung->kbd_led_wk);
1020 }
1021
1022 static void kbd_led_set(struct led_classdev *led_cdev,
1023                         enum led_brightness value)
1024 {
1025         struct samsung_laptop *samsung;
1026
1027         samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
1028
1029         if (value > samsung->kbd_led.max_brightness)
1030                 value = samsung->kbd_led.max_brightness;
1031         else if (value < 0)
1032                 value = 0;
1033
1034         samsung->kbd_led_wk = value;
1035         queue_work(samsung->led_workqueue, &samsung->kbd_led_work);
1036 }
1037
1038 static enum led_brightness kbd_led_get(struct led_classdev *led_cdev)
1039 {
1040         struct samsung_laptop *samsung;
1041
1042         samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
1043         return kbd_backlight_read(samsung);
1044 }
1045
1046 static void samsung_leds_exit(struct samsung_laptop *samsung)
1047 {
1048         if (!IS_ERR_OR_NULL(samsung->kbd_led.dev))
1049                 led_classdev_unregister(&samsung->kbd_led);
1050         if (samsung->led_workqueue)
1051                 destroy_workqueue(samsung->led_workqueue);
1052 }
1053
1054 static int __init samsung_leds_init(struct samsung_laptop *samsung)
1055 {
1056         int ret = 0;
1057
1058         samsung->led_workqueue = create_singlethread_workqueue("led_workqueue");
1059         if (!samsung->led_workqueue)
1060                 return -ENOMEM;
1061
1062         if (kbd_backlight_enable(samsung) >= 0) {
1063                 INIT_WORK(&samsung->kbd_led_work, kbd_led_update);
1064
1065                 samsung->kbd_led.name = "samsung::kbd_backlight";
1066                 samsung->kbd_led.brightness_set = kbd_led_set;
1067                 samsung->kbd_led.brightness_get = kbd_led_get;
1068                 samsung->kbd_led.max_brightness = 8;
1069                 if (samsung->quirks->four_kbd_backlight_levels)
1070                         samsung->kbd_led.max_brightness = 4;
1071
1072                 ret = led_classdev_register(&samsung->platform_device->dev,
1073                                            &samsung->kbd_led);
1074         }
1075
1076         if (ret)
1077                 samsung_leds_exit(samsung);
1078
1079         return ret;
1080 }
1081
1082 static void samsung_backlight_exit(struct samsung_laptop *samsung)
1083 {
1084         if (samsung->backlight_device) {
1085                 backlight_device_unregister(samsung->backlight_device);
1086                 samsung->backlight_device = NULL;
1087         }
1088 }
1089
1090 static int __init samsung_backlight_init(struct samsung_laptop *samsung)
1091 {
1092         struct backlight_device *bd;
1093         struct backlight_properties props;
1094
1095         if (!samsung->handle_backlight)
1096                 return 0;
1097
1098         memset(&props, 0, sizeof(struct backlight_properties));
1099         props.type = BACKLIGHT_PLATFORM;
1100         props.max_brightness = samsung->config->max_brightness -
1101                 samsung->config->min_brightness;
1102
1103         bd = backlight_device_register("samsung",
1104                                        &samsung->platform_device->dev,
1105                                        samsung, &backlight_ops,
1106                                        &props);
1107         if (IS_ERR(bd))
1108                 return PTR_ERR(bd);
1109
1110         samsung->backlight_device = bd;
1111         samsung->backlight_device->props.brightness = read_brightness(samsung);
1112         samsung->backlight_device->props.power = FB_BLANK_UNBLANK;
1113         backlight_update_status(samsung->backlight_device);
1114
1115         return 0;
1116 }
1117
1118 static umode_t samsung_sysfs_is_visible(struct kobject *kobj,
1119                                        struct attribute *attr, int idx)
1120 {
1121         struct device *dev = container_of(kobj, struct device, kobj);
1122         struct platform_device *pdev = to_platform_device(dev);
1123         struct samsung_laptop *samsung = platform_get_drvdata(pdev);
1124         bool ok = true;
1125
1126         if (attr == &dev_attr_performance_level.attr)
1127                 ok = !!samsung->config->performance_levels[0].name;
1128         if (attr == &dev_attr_battery_life_extender.attr)
1129                 ok = !!(read_battery_life_extender(samsung) >= 0);
1130         if (attr == &dev_attr_usb_charge.attr)
1131                 ok = !!(read_usb_charge(samsung) >= 0);
1132
1133         return ok ? attr->mode : 0;
1134 }
1135
1136 static struct attribute_group platform_attribute_group = {
1137         .is_visible = samsung_sysfs_is_visible,
1138         .attrs = platform_attributes
1139 };
1140
1141 static void samsung_sysfs_exit(struct samsung_laptop *samsung)
1142 {
1143         struct platform_device *device = samsung->platform_device;
1144
1145         sysfs_remove_group(&device->dev.kobj, &platform_attribute_group);
1146 }
1147
1148 static int __init samsung_sysfs_init(struct samsung_laptop *samsung)
1149 {
1150         struct platform_device *device = samsung->platform_device;
1151
1152         return sysfs_create_group(&device->dev.kobj, &platform_attribute_group);
1153
1154 }
1155
1156 static int show_call(struct seq_file *m, void *data)
1157 {
1158         struct samsung_laptop *samsung = m->private;
1159         struct sabi_data *sdata = &samsung->debug.data;
1160         int ret;
1161
1162         seq_printf(m, "SABI 0x%04x {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
1163                    samsung->debug.command,
1164                    sdata->d0, sdata->d1, sdata->d2, sdata->d3);
1165
1166         ret = sabi_command(samsung, samsung->debug.command, sdata, sdata);
1167
1168         if (ret) {
1169                 seq_printf(m, "SABI command 0x%04x failed\n",
1170                            samsung->debug.command);
1171                 return ret;
1172         }
1173
1174         seq_printf(m, "SABI {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
1175                    sdata->d0, sdata->d1, sdata->d2, sdata->d3);
1176         return 0;
1177 }
1178
1179 static int samsung_debugfs_open(struct inode *inode, struct file *file)
1180 {
1181         return single_open(file, show_call, inode->i_private);
1182 }
1183
1184 static const struct file_operations samsung_laptop_call_io_ops = {
1185         .owner = THIS_MODULE,
1186         .open = samsung_debugfs_open,
1187         .read = seq_read,
1188         .llseek = seq_lseek,
1189         .release = single_release,
1190 };
1191
1192 static void samsung_debugfs_exit(struct samsung_laptop *samsung)
1193 {
1194         debugfs_remove_recursive(samsung->debug.root);
1195 }
1196
1197 static int samsung_debugfs_init(struct samsung_laptop *samsung)
1198 {
1199         struct dentry *dent;
1200
1201         samsung->debug.root = debugfs_create_dir("samsung-laptop", NULL);
1202         if (!samsung->debug.root) {
1203                 pr_err("failed to create debugfs directory");
1204                 goto error_debugfs;
1205         }
1206
1207         samsung->debug.f0000_wrapper.data = samsung->f0000_segment;
1208         samsung->debug.f0000_wrapper.size = 0xffff;
1209
1210         samsung->debug.data_wrapper.data = &samsung->debug.data;
1211         samsung->debug.data_wrapper.size = sizeof(samsung->debug.data);
1212
1213         samsung->debug.sdiag_wrapper.data = samsung->sdiag;
1214         samsung->debug.sdiag_wrapper.size = strlen(samsung->sdiag);
1215
1216         dent = debugfs_create_u16("command", S_IRUGO | S_IWUSR,
1217                                   samsung->debug.root, &samsung->debug.command);
1218         if (!dent)
1219                 goto error_debugfs;
1220
1221         dent = debugfs_create_u32("d0", S_IRUGO | S_IWUSR, samsung->debug.root,
1222                                   &samsung->debug.data.d0);
1223         if (!dent)
1224                 goto error_debugfs;
1225
1226         dent = debugfs_create_u32("d1", S_IRUGO | S_IWUSR, samsung->debug.root,
1227                                   &samsung->debug.data.d1);
1228         if (!dent)
1229                 goto error_debugfs;
1230
1231         dent = debugfs_create_u16("d2", S_IRUGO | S_IWUSR, samsung->debug.root,
1232                                   &samsung->debug.data.d2);
1233         if (!dent)
1234                 goto error_debugfs;
1235
1236         dent = debugfs_create_u8("d3", S_IRUGO | S_IWUSR, samsung->debug.root,
1237                                  &samsung->debug.data.d3);
1238         if (!dent)
1239                 goto error_debugfs;
1240
1241         dent = debugfs_create_blob("data", S_IRUGO | S_IWUSR,
1242                                    samsung->debug.root,
1243                                    &samsung->debug.data_wrapper);
1244         if (!dent)
1245                 goto error_debugfs;
1246
1247         dent = debugfs_create_blob("f0000_segment", S_IRUSR | S_IWUSR,
1248                                    samsung->debug.root,
1249                                    &samsung->debug.f0000_wrapper);
1250         if (!dent)
1251                 goto error_debugfs;
1252
1253         dent = debugfs_create_file("call", S_IFREG | S_IRUGO,
1254                                    samsung->debug.root, samsung,
1255                                    &samsung_laptop_call_io_ops);
1256         if (!dent)
1257                 goto error_debugfs;
1258
1259         dent = debugfs_create_blob("sdiag", S_IRUGO | S_IWUSR,
1260                                    samsung->debug.root,
1261                                    &samsung->debug.sdiag_wrapper);
1262         if (!dent)
1263                 goto error_debugfs;
1264
1265         return 0;
1266
1267 error_debugfs:
1268         samsung_debugfs_exit(samsung);
1269         return -ENOMEM;
1270 }
1271
1272 static void samsung_sabi_exit(struct samsung_laptop *samsung)
1273 {
1274         const struct sabi_config *config = samsung->config;
1275
1276         /* Turn off "Linux" mode in the BIOS */
1277         if (config && config->commands.set_linux != 0xff)
1278                 sabi_set_commandb(samsung, config->commands.set_linux, 0x80);
1279
1280         if (samsung->sabi_iface) {
1281                 iounmap(samsung->sabi_iface);
1282                 samsung->sabi_iface = NULL;
1283         }
1284         if (samsung->f0000_segment) {
1285                 iounmap(samsung->f0000_segment);
1286                 samsung->f0000_segment = NULL;
1287         }
1288
1289         samsung->config = NULL;
1290 }
1291
1292 static __init void samsung_sabi_infos(struct samsung_laptop *samsung, int loca,
1293                                       unsigned int ifaceP)
1294 {
1295         const struct sabi_config *config = samsung->config;
1296
1297         printk(KERN_DEBUG "This computer supports SABI==%x\n",
1298                loca + 0xf0000 - 6);
1299
1300         printk(KERN_DEBUG "SABI header:\n");
1301         printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",
1302                readw(samsung->sabi + config->header_offsets.port));
1303         printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
1304                readb(samsung->sabi + config->header_offsets.iface_func));
1305         printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
1306                readb(samsung->sabi + config->header_offsets.en_mem));
1307         printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
1308                readb(samsung->sabi + config->header_offsets.re_mem));
1309         printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
1310                readw(samsung->sabi + config->header_offsets.data_offset));
1311         printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
1312                readw(samsung->sabi + config->header_offsets.data_segment));
1313
1314         printk(KERN_DEBUG " SABI pointer = 0x%08x\n", ifaceP);
1315 }
1316
1317 static void __init samsung_sabi_diag(struct samsung_laptop *samsung)
1318 {
1319         int loca = find_signature(samsung->f0000_segment, "SDiaG@");
1320         int i;
1321
1322         if (loca == 0xffff)
1323                 return ;
1324
1325         /* Example:
1326          * Ident: @SDiaG@686XX-N90X3A/966-SEC-07HL-S90X3A
1327          *
1328          * Product name: 90X3A
1329          * BIOS Version: 07HL
1330          */
1331         loca += 1;
1332         for (i = 0; loca < 0xffff && i < sizeof(samsung->sdiag) - 1; loca++) {
1333                 char temp = readb(samsung->f0000_segment + loca);
1334
1335                 if (isalnum(temp) || temp == '/' || temp == '-')
1336                         samsung->sdiag[i++] = temp;
1337                 else
1338                         break ;
1339         }
1340
1341         if (debug && samsung->sdiag[0])
1342                 pr_info("sdiag: %s", samsung->sdiag);
1343 }
1344
1345 static int __init samsung_sabi_init(struct samsung_laptop *samsung)
1346 {
1347         const struct sabi_config *config = NULL;
1348         const struct sabi_commands *commands;
1349         unsigned int ifaceP;
1350         int loca = 0xffff;
1351         int ret = 0;
1352         int i;
1353
1354         samsung->f0000_segment = ioremap_nocache(0xf0000, 0xffff);
1355         if (!samsung->f0000_segment) {
1356                 if (debug || force)
1357                         pr_err("Can't map the segment at 0xf0000\n");
1358                 ret = -EINVAL;
1359                 goto exit;
1360         }
1361
1362         samsung_sabi_diag(samsung);
1363
1364         /* Try to find one of the signatures in memory to find the header */
1365         for (i = 0; sabi_configs[i].test_string != 0; ++i) {
1366                 samsung->config = &sabi_configs[i];
1367                 loca = find_signature(samsung->f0000_segment,
1368                                       samsung->config->test_string);
1369                 if (loca != 0xffff)
1370                         break;
1371         }
1372
1373         if (loca == 0xffff) {
1374                 if (debug || force)
1375                         pr_err("This computer does not support SABI\n");
1376                 ret = -ENODEV;
1377                 goto exit;
1378         }
1379
1380         config = samsung->config;
1381         commands = &config->commands;
1382
1383         /* point to the SMI port Number */
1384         loca += 1;
1385         samsung->sabi = (samsung->f0000_segment + loca);
1386
1387         /* Get a pointer to the SABI Interface */
1388         ifaceP = (readw(samsung->sabi + config->header_offsets.data_segment) & 0x0ffff) << 4;
1389         ifaceP += readw(samsung->sabi + config->header_offsets.data_offset) & 0x0ffff;
1390
1391         if (debug)
1392                 samsung_sabi_infos(samsung, loca, ifaceP);
1393
1394         samsung->sabi_iface = ioremap_nocache(ifaceP, 16);
1395         if (!samsung->sabi_iface) {
1396                 pr_err("Can't remap %x\n", ifaceP);
1397                 ret = -EINVAL;
1398                 goto exit;
1399         }
1400
1401         /* Turn on "Linux" mode in the BIOS */
1402         if (commands->set_linux != 0xff) {
1403                 int retval = sabi_set_commandb(samsung,
1404                                                commands->set_linux, 0x81);
1405                 if (retval) {
1406                         pr_warn("Linux mode was not set!\n");
1407                         ret = -ENODEV;
1408                         goto exit;
1409                 }
1410         }
1411
1412         /* Check for stepping quirk */
1413         if (samsung->handle_backlight)
1414                 check_for_stepping_quirk(samsung);
1415
1416         pr_info("detected SABI interface: %s\n",
1417                 samsung->config->test_string);
1418
1419 exit:
1420         if (ret)
1421                 samsung_sabi_exit(samsung);
1422
1423         return ret;
1424 }
1425
1426 static void samsung_platform_exit(struct samsung_laptop *samsung)
1427 {
1428         if (samsung->platform_device) {
1429                 platform_device_unregister(samsung->platform_device);
1430                 samsung->platform_device = NULL;
1431         }
1432 }
1433
1434 static int samsung_pm_notification(struct notifier_block *nb,
1435                                    unsigned long val, void *ptr)
1436 {
1437         struct samsung_laptop *samsung;
1438
1439         samsung = container_of(nb, struct samsung_laptop, pm_nb);
1440         if (val == PM_POST_HIBERNATION &&
1441             samsung->quirks->enable_kbd_backlight)
1442                 kbd_backlight_enable(samsung);
1443
1444         return 0;
1445 }
1446
1447 static int __init samsung_platform_init(struct samsung_laptop *samsung)
1448 {
1449         struct platform_device *pdev;
1450
1451         pdev = platform_device_register_simple("samsung", -1, NULL, 0);
1452         if (IS_ERR(pdev))
1453                 return PTR_ERR(pdev);
1454
1455         samsung->platform_device = pdev;
1456         platform_set_drvdata(samsung->platform_device, samsung);
1457         return 0;
1458 }
1459
1460 static struct samsung_quirks *quirks;
1461
1462 static int __init samsung_dmi_matched(const struct dmi_system_id *d)
1463 {
1464         quirks = d->driver_data;
1465         return 0;
1466 }
1467
1468 static struct dmi_system_id __initdata samsung_dmi_table[] = {
1469         {
1470                 .matches = {
1471                         DMI_MATCH(DMI_SYS_VENDOR,
1472                                         "SAMSUNG ELECTRONICS CO., LTD."),
1473                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"), /* Portable */
1474                 },
1475         },
1476         {
1477                 .matches = {
1478                         DMI_MATCH(DMI_SYS_VENDOR,
1479                                         "SAMSUNG ELECTRONICS CO., LTD."),
1480                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /* Laptop */
1481                 },
1482         },
1483         {
1484                 .matches = {
1485                         DMI_MATCH(DMI_SYS_VENDOR,
1486                                         "SAMSUNG ELECTRONICS CO., LTD."),
1487                         DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /* Notebook */
1488                 },
1489         },
1490         {
1491                 .matches = {
1492                         DMI_MATCH(DMI_SYS_VENDOR,
1493                                         "SAMSUNG ELECTRONICS CO., LTD."),
1494                         DMI_MATCH(DMI_CHASSIS_TYPE, "14"), /* Sub-Notebook */
1495                 },
1496         },
1497         /* DMI ids for laptops with bad Chassis Type */
1498         {
1499           .ident = "R40/R41",
1500           .matches = {
1501                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1502                 DMI_MATCH(DMI_PRODUCT_NAME, "R40/R41"),
1503                 DMI_MATCH(DMI_BOARD_NAME, "R40/R41"),
1504                 },
1505         },
1506         /* Specific DMI ids for laptop with quirks */
1507         {
1508          .callback = samsung_dmi_matched,
1509          .ident = "N150P",
1510          .matches = {
1511                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1512                 DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
1513                 DMI_MATCH(DMI_BOARD_NAME, "N150P"),
1514                 },
1515          .driver_data = &samsung_use_native_backlight,
1516         },
1517         {
1518          .callback = samsung_dmi_matched,
1519          .ident = "N145P/N250P/N260P",
1520          .matches = {
1521                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1522                 DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
1523                 DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
1524                 },
1525          .driver_data = &samsung_use_native_backlight,
1526         },
1527         {
1528          .callback = samsung_dmi_matched,
1529          .ident = "N150/N210/N220",
1530          .matches = {
1531                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1532                 DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
1533                 DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
1534                 },
1535          .driver_data = &samsung_broken_acpi_video,
1536         },
1537         {
1538          .callback = samsung_dmi_matched,
1539          .ident = "NF110/NF210/NF310",
1540          .matches = {
1541                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1542                 DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
1543                 DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
1544                 },
1545          .driver_data = &samsung_broken_acpi_video,
1546         },
1547         {
1548          .callback = samsung_dmi_matched,
1549          .ident = "X360",
1550          .matches = {
1551                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1552                 DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
1553                 DMI_MATCH(DMI_BOARD_NAME, "X360"),
1554                 },
1555          .driver_data = &samsung_broken_acpi_video,
1556         },
1557         {
1558          .callback = samsung_dmi_matched,
1559          .ident = "N250P",
1560          .matches = {
1561                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1562                 DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
1563                 DMI_MATCH(DMI_BOARD_NAME, "N250P"),
1564                 },
1565          .driver_data = &samsung_use_native_backlight,
1566         },
1567         {
1568          .callback = samsung_dmi_matched,
1569          .ident = "NC210",
1570          .matches = {
1571                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1572                 DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
1573                 DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
1574                 },
1575          .driver_data = &samsung_broken_acpi_video,
1576         },
1577         {
1578          .callback = samsung_dmi_matched,
1579          .ident = "730U3E/740U3E",
1580          .matches = {
1581                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1582                 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
1583                 },
1584          .driver_data = &samsung_np740u3e,
1585         },
1586         { },
1587 };
1588 MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
1589
1590 static struct platform_device *samsung_platform_device;
1591
1592 static int __init samsung_init(void)
1593 {
1594         struct samsung_laptop *samsung;
1595         int ret;
1596
1597         if (efi_enabled(EFI_BOOT))
1598                 return -ENODEV;
1599
1600         quirks = &samsung_unknown;
1601         if (!force && !dmi_check_system(samsung_dmi_table))
1602                 return -ENODEV;
1603
1604         samsung = kzalloc(sizeof(*samsung), GFP_KERNEL);
1605         if (!samsung)
1606                 return -ENOMEM;
1607
1608         mutex_init(&samsung->sabi_mutex);
1609         samsung->handle_backlight = true;
1610         samsung->quirks = quirks;
1611
1612
1613 #ifdef CONFIG_ACPI
1614         if (samsung->quirks->broken_acpi_video)
1615                 acpi_video_dmi_promote_vendor();
1616
1617         /* Don't handle backlight here if the acpi video already handle it */
1618         if (acpi_video_backlight_support()) {
1619                 samsung->handle_backlight = false;
1620         } else if (samsung->quirks->broken_acpi_video) {
1621                 pr_info("Disabling ACPI video driver\n");
1622                 acpi_video_unregister();
1623         }
1624
1625         if (samsung->quirks->use_native_backlight) {
1626                 pr_info("Using native backlight driver\n");
1627                 /* Tell acpi-video to not handle the backlight */
1628                 acpi_video_dmi_promote_vendor();
1629                 acpi_video_unregister();
1630                 /* And also do not handle it ourselves */
1631                 samsung->handle_backlight = false;
1632         }
1633 #endif
1634
1635         ret = samsung_platform_init(samsung);
1636         if (ret)
1637                 goto error_platform;
1638
1639         ret = samsung_sabi_init(samsung);
1640         if (ret)
1641                 goto error_sabi;
1642
1643 #ifdef CONFIG_ACPI
1644         /* Only log that if we are really on a sabi platform */
1645         if (acpi_video_backlight_support())
1646                 pr_info("Backlight controlled by ACPI video driver\n");
1647 #endif
1648
1649         ret = samsung_sysfs_init(samsung);
1650         if (ret)
1651                 goto error_sysfs;
1652
1653         ret = samsung_backlight_init(samsung);
1654         if (ret)
1655                 goto error_backlight;
1656
1657         ret = samsung_rfkill_init(samsung);
1658         if (ret)
1659                 goto error_rfkill;
1660
1661         ret = samsung_leds_init(samsung);
1662         if (ret)
1663                 goto error_leds;
1664
1665         ret = samsung_debugfs_init(samsung);
1666         if (ret)
1667                 goto error_debugfs;
1668
1669         samsung->pm_nb.notifier_call = samsung_pm_notification;
1670         register_pm_notifier(&samsung->pm_nb);
1671
1672         samsung_platform_device = samsung->platform_device;
1673         return ret;
1674
1675 error_debugfs:
1676         samsung_leds_exit(samsung);
1677 error_leds:
1678         samsung_rfkill_exit(samsung);
1679 error_rfkill:
1680         samsung_backlight_exit(samsung);
1681 error_backlight:
1682         samsung_sysfs_exit(samsung);
1683 error_sysfs:
1684         samsung_sabi_exit(samsung);
1685 error_sabi:
1686         samsung_platform_exit(samsung);
1687 error_platform:
1688         kfree(samsung);
1689         return ret;
1690 }
1691
1692 static void __exit samsung_exit(void)
1693 {
1694         struct samsung_laptop *samsung;
1695
1696         samsung = platform_get_drvdata(samsung_platform_device);
1697         unregister_pm_notifier(&samsung->pm_nb);
1698
1699         samsung_debugfs_exit(samsung);
1700         samsung_leds_exit(samsung);
1701         samsung_rfkill_exit(samsung);
1702         samsung_backlight_exit(samsung);
1703         samsung_sysfs_exit(samsung);
1704         samsung_sabi_exit(samsung);
1705         samsung_platform_exit(samsung);
1706
1707         kfree(samsung);
1708         samsung_platform_device = NULL;
1709 }
1710
1711 module_init(samsung_init);
1712 module_exit(samsung_exit);
1713
1714 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
1715 MODULE_DESCRIPTION("Samsung Backlight driver");
1716 MODULE_LICENSE("GPL");