drivers/platform/x86/samsung-laptop.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Samsung Laptop driver
   4  *
   5  * Copyright (C) 2009,2011 Greg Kroah-Hartman (gregkh@suse.de)
   6  * Copyright (C) 2009,2011 Novell Inc.
   7  */
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/delay.h>
  14 #include <linux/pci.h>
  15 #include <linux/backlight.h>
  16 #include <linux/leds.h>
  17 #include <linux/fb.h>
  18 #include <linux/dmi.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/rfkill.h>
  21 #include <linux/acpi.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/debugfs.h>
  24 #include <linux/ctype.h>
  25 #include <linux/efi.h>
  26 #include <linux/suspend.h>
  27 #include <acpi/video.h>
  28
  29 /*
  30  * This driver is needed because a number of Samsung laptops do not hook
  31  * their control settings through ACPI.  So we have to poke around in the
  32  * BIOS to do things like brightness values, and "special" key controls.
  33  */
  34
  35 /*
  36  * We have 0 - 8 as valid brightness levels.  The specs say that level 0 should
  37  * be reserved by the BIOS (which really doesn't make much sense), we tell
  38  * userspace that the value is 0 - 7 and then just tell the hardware 1 - 8
  39  */
  40 #define MAX_BRIGHT      0x07
  41
  42
  43 #define SABI_IFACE_MAIN                 0x00
  44 #define SABI_IFACE_SUB                  0x02
  45 #define SABI_IFACE_COMPLETE             0x04
  46 #define SABI_IFACE_DATA                 0x05
  47
  48 #define WL_STATUS_WLAN                  0x0
  49 #define WL_STATUS_BT                    0x2
  50
  51 /* Structure get/set data using sabi */
  52 struct sabi_data {
  53         union {
  54                 struct {
  55                         u32 d0;
  56                         u32 d1;
  57                         u16 d2;
  58                         u8  d3;
  59                 };
  60                 u8 data[11];
  61         };
  62 };
  63
  64 struct sabi_header_offsets {
  65         u8 port;
  66         u8 re_mem;
  67         u8 iface_func;
  68         u8 en_mem;
  69         u8 data_offset;
  70         u8 data_segment;
  71 };
  72
  73 struct sabi_commands {
  74         /*
  75          * Brightness is 0 - 8, as described above.
  76          * Value 0 is for the BIOS to use
  77          */
  78         u16 get_brightness;
  79         u16 set_brightness;
  80
  81         /*
  82          * first byte:
  83          * 0x00 - wireless is off
  84          * 0x01 - wireless is on
  85          * second byte:
  86          * 0x02 - 3G is off
  87          * 0x03 - 3G is on
  88          * TODO, verify 3G is correct, that doesn't seem right...
  89          */
  90         u16 get_wireless_button;
  91         u16 set_wireless_button;
  92
  93         /* 0 is off, 1 is on */
  94         u16 get_backlight;
  95         u16 set_backlight;
  96
  97         /*
  98          * 0x80 or 0x00 - no action
  99          * 0x81 - recovery key pressed
 100          */
 101         u16 get_recovery_mode;
 102         u16 set_recovery_mode;
 103
 104         /*
 105          * on seclinux: 0 is low, 1 is high,
 106          * on swsmi: 0 is normal, 1 is silent, 2 is turbo
 107          */
 108         u16 get_performance_level;
 109         u16 set_performance_level;
 110
 111         /* 0x80 is off, 0x81 is on */
 112         u16 get_battery_life_extender;
 113         u16 set_battery_life_extender;
 114
 115         /* 0x80 is off, 0x81 is on */
 116         u16 get_usb_charge;
 117         u16 set_usb_charge;
 118
 119         /* the first byte is for bluetooth and the third one is for wlan */
 120         u16 get_wireless_status;
 121         u16 set_wireless_status;
 122
 123         /* 0x80 is off, 0x81 is on */
 124         u16 get_lid_handling;
 125         u16 set_lid_handling;
 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                         .get_lid_handling = 0xFFFF,
 198                         .set_lid_handling = 0xFFFF,
 199
 200                         .kbd_backlight = 0xFFFF,
 201
 202                         .set_linux = 0x0a,
 203                 },
 204
 205                 .performance_levels = {
 206                         {
 207                                 .name = "silent",
 208                                 .value = 0,
 209                         },
 210                         {
 211                                 .name = "normal",
 212                                 .value = 1,
 213                         },
 214                         { },
 215                 },
 216                 .min_brightness = 1,
 217                 .max_brightness = 8,
 218         },
 219         {
 220                 .sabi_version = 3,
 221
 222                 .test_string = "SwSmi@",
 223
 224                 .main_function = 0x5843,
 225
 226                 .header_offsets = {
 227                         .port = 0x00,
 228                         .re_mem = 0x04,
 229                         .iface_func = 0x02,
 230                         .en_mem = 0x03,
 231                         .data_offset = 0x05,
 232                         .data_segment = 0x07,
 233                 },
 234
 235                 .commands = {
 236                         .get_brightness = 0x10,
 237                         .set_brightness = 0x11,
 238
 239                         .get_wireless_button = 0x12,
 240                         .set_wireless_button = 0x13,
 241
 242                         .get_backlight = 0x2d,
 243                         .set_backlight = 0x2e,
 244
 245                         .get_recovery_mode = 0xff,
 246                         .set_recovery_mode = 0xff,
 247
 248                         .get_performance_level = 0x31,
 249                         .set_performance_level = 0x32,
 250
 251                         .get_battery_life_extender = 0x65,
 252                         .set_battery_life_extender = 0x66,
 253
 254                         .get_usb_charge = 0x67,
 255                         .set_usb_charge = 0x68,
 256
 257                         .get_wireless_status = 0x69,
 258                         .set_wireless_status = 0x6a,
 259
 260                         .get_lid_handling = 0x6d,
 261                         .set_lid_handling = 0x6e,
 262
 263                         .kbd_backlight = 0x78,
 264
 265                         .set_linux = 0xff,
 266                 },
 267
 268                 .performance_levels = {
 269                         {
 270                                 .name = "normal",
 271                                 .value = 0,
 272                         },
 273                         {
 274                                 .name = "silent",
 275                                 .value = 1,
 276                         },
 277                         {
 278                                 .name = "overclock",
 279                                 .value = 2,
 280                         },
 281                         { },
 282                 },
 283                 .min_brightness = 0,
 284                 .max_brightness = 8,
 285         },
 286         { },
 287 };
 288
 289 /*
 290  * samsung-laptop/    - debugfs root directory
 291  *   f0000_segment    - dump f0000 segment
 292  *   command          - current command
 293  *   data             - current data
 294  *   d0, d1, d2, d3   - data fields
 295  *   call             - call SABI using command and data
 296  *
 297  * This allow to call arbitrary sabi commands wihout
 298  * modifying the driver at all.
 299  * For example, setting the keyboard backlight brightness to 5
 300  *
 301  *  echo 0x78 > command
 302  *  echo 0x0582 > d0
 303  *  echo 0 > d1
 304  *  echo 0 > d2
 305  *  echo 0 > d3
 306  *  cat call
 307  */
 308
 309 struct samsung_laptop_debug {
 310         struct dentry *root;
 311         struct sabi_data data;
 312         u16 command;
 313
 314         struct debugfs_blob_wrapper f0000_wrapper;
 315         struct debugfs_blob_wrapper data_wrapper;
 316         struct debugfs_blob_wrapper sdiag_wrapper;
 317 };
 318
 319 struct samsung_laptop;
 320
 321 struct samsung_rfkill {
 322         struct samsung_laptop *samsung;
 323         struct rfkill *rfkill;
 324         enum rfkill_type type;
 325 };
 326
 327 struct samsung_laptop {
 328         const struct sabi_config *config;
 329
 330         void __iomem *sabi;
 331         void __iomem *sabi_iface;
 332         void __iomem *f0000_segment;
 333
 334         struct mutex sabi_mutex;
 335
 336         struct platform_device *platform_device;
 337         struct backlight_device *backlight_device;
 338
 339         struct samsung_rfkill wlan;
 340         struct samsung_rfkill bluetooth;
 341
 342         struct led_classdev kbd_led;
 343         int kbd_led_wk;
 344         struct workqueue_struct *led_workqueue;
 345         struct work_struct kbd_led_work;
 346
 347         struct samsung_laptop_debug debug;
 348         struct samsung_quirks *quirks;
 349
 350         struct notifier_block pm_nb;
 351
 352         bool handle_backlight;
 353         bool has_stepping_quirk;
 354
 355         char sdiag[64];
 356 };
 357
 358 struct samsung_quirks {
 359         bool broken_acpi_video;
 360         bool four_kbd_backlight_levels;
 361         bool enable_kbd_backlight;
 362         bool use_native_backlight;
 363         bool lid_handling;
 364 };
 365
 366 static struct samsung_quirks samsung_unknown = {};
 367
 368 static struct samsung_quirks samsung_broken_acpi_video = {
 369         .broken_acpi_video = true,
 370 };
 371
 372 static struct samsung_quirks samsung_use_native_backlight = {
 373         .use_native_backlight = true,
 374 };
 375
 376 static struct samsung_quirks samsung_np740u3e = {
 377         .four_kbd_backlight_levels = true,
 378         .enable_kbd_backlight = true,
 379 };
 380
 381 static struct samsung_quirks samsung_lid_handling = {
 382         .lid_handling = true,
 383 };
 384
 385 static bool force;
 386 module_param(force, bool, 0);
 387 MODULE_PARM_DESC(force,
 388                 "Disable the DMI check and forces the driver to be loaded");
 389
 390 static bool debug;
 391 module_param(debug, bool, S_IRUGO | S_IWUSR);
 392 MODULE_PARM_DESC(debug, "Debug enabled or not");
 393
 394 static int sabi_command(struct samsung_laptop *samsung, u16 command,
 395                         struct sabi_data *in,
 396                         struct sabi_data *out)
 397 {
 398         const struct sabi_config *config = samsung->config;
 399         int ret = 0;
 400         u16 port = readw(samsung->sabi + config->header_offsets.port);
 401         u8 complete, iface_data;
 402
 403         mutex_lock(&samsung->sabi_mutex);
 404
 405         if (debug) {
 406                 if (in)
 407                         pr_info("SABI command:0x%04x "
 408                                 "data:{0x%08x, 0x%08x, 0x%04x, 0x%02x}",
 409                                 command, in->d0, in->d1, in->d2, in->d3);
 410                 else
 411                         pr_info("SABI command:0x%04x", command);
 412         }
 413
 414         /* enable memory to be able to write to it */
 415         outb(readb(samsung->sabi + config->header_offsets.en_mem), port);
 416
 417         /* write out the command */
 418         writew(config->main_function, samsung->sabi_iface + SABI_IFACE_MAIN);
 419         writew(command, samsung->sabi_iface + SABI_IFACE_SUB);
 420         writeb(0, samsung->sabi_iface + SABI_IFACE_COMPLETE);
 421         if (in) {
 422                 writel(in->d0, samsung->sabi_iface + SABI_IFACE_DATA);
 423                 writel(in->d1, samsung->sabi_iface + SABI_IFACE_DATA + 4);
 424                 writew(in->d2, samsung->sabi_iface + SABI_IFACE_DATA + 8);
 425                 writeb(in->d3, samsung->sabi_iface + SABI_IFACE_DATA + 10);
 426         }
 427         outb(readb(samsung->sabi + config->header_offsets.iface_func), port);
 428
 429         /* write protect memory to make it safe */
 430         outb(readb(samsung->sabi + config->header_offsets.re_mem), port);
 431
 432         /* see if the command actually succeeded */
 433         complete = readb(samsung->sabi_iface + SABI_IFACE_COMPLETE);
 434         iface_data = readb(samsung->sabi_iface + SABI_IFACE_DATA);
 435
 436         /* iface_data = 0xFF happens when a command is not known
 437          * so we only add a warning in debug mode since we will
 438          * probably issue some unknown command at startup to find
 439          * out which features are supported */
 440         if (complete != 0xaa || (iface_data == 0xff && debug))
 441                 pr_warn("SABI command 0x%04x failed with"
 442                         " completion flag 0x%02x and interface data 0x%02x",
 443                         command, complete, iface_data);
 444
 445         if (complete != 0xaa || iface_data == 0xff) {
 446                 ret = -EINVAL;
 447                 goto exit;
 448         }
 449
 450         if (out) {
 451                 out->d0 = readl(samsung->sabi_iface + SABI_IFACE_DATA);
 452                 out->d1 = readl(samsung->sabi_iface + SABI_IFACE_DATA + 4);
 453                 out->d2 = readw(samsung->sabi_iface + SABI_IFACE_DATA + 2);
 454                 out->d3 = readb(samsung->sabi_iface + SABI_IFACE_DATA + 1);
 455         }
 456
 457         if (debug && out) {
 458                 pr_info("SABI return data:{0x%08x, 0x%08x, 0x%04x, 0x%02x}",
 459                         out->d0, out->d1, out->d2, out->d3);
 460         }
 461
 462 exit:
 463         mutex_unlock(&samsung->sabi_mutex);
 464         return ret;
 465 }
 466
 467 /* simple wrappers usable with most commands */
 468 static int sabi_set_commandb(struct samsung_laptop *samsung,
 469                              u16 command, u8 data)
 470 {
 471         struct sabi_data in = { { { .d0 = 0, .d1 = 0, .d2 = 0, .d3 = 0 } } };
 472
 473         in.data[0] = data;
 474         return sabi_command(samsung, command, &in, NULL);
 475 }
 476
 477 static int read_brightness(struct samsung_laptop *samsung)
 478 {
 479         const struct sabi_config *config = samsung->config;
 480         const struct sabi_commands *commands = &samsung->config->commands;
 481         struct sabi_data sretval;
 482         int user_brightness = 0;
 483         int retval;
 484
 485         retval = sabi_command(samsung, commands->get_brightness,
 486                               NULL, &sretval);
 487         if (retval)
 488                 return retval;
 489
 490         user_brightness = sretval.data[0];
 491         if (user_brightness > config->min_brightness)
 492                 user_brightness -= config->min_brightness;
 493         else
 494                 user_brightness = 0;
 495
 496         return user_brightness;
 497 }
 498
 499 static void set_brightness(struct samsung_laptop *samsung, u8 user_brightness)
 500 {
 501         const struct sabi_config *config = samsung->config;
 502         const struct sabi_commands *commands = &samsung->config->commands;
 503         u8 user_level = user_brightness + config->min_brightness;
 504
 505         if (samsung->has_stepping_quirk && user_level != 0) {
 506                 /*
 507                  * short circuit if the specified level is what's already set
 508                  * to prevent the screen from flickering needlessly
 509                  */
 510                 if (user_brightness == read_brightness(samsung))
 511                         return;
 512
 513                 sabi_set_commandb(samsung, commands->set_brightness, 0);
 514         }
 515
 516         sabi_set_commandb(samsung, commands->set_brightness, user_level);
 517 }
 518
 519 static int get_brightness(struct backlight_device *bd)
 520 {
 521         struct samsung_laptop *samsung = bl_get_data(bd);
 522
 523         return read_brightness(samsung);
 524 }
 525
 526 static void check_for_stepping_quirk(struct samsung_laptop *samsung)
 527 {
 528         int initial_level;
 529         int check_level;
 530         int orig_level = read_brightness(samsung);
 531
 532         /*
 533          * Some laptops exhibit the strange behaviour of stepping toward
 534          * (rather than setting) the brightness except when changing to/from
 535          * brightness level 0. This behaviour is checked for here and worked
 536          * around in set_brightness.
 537          */
 538
 539         if (orig_level == 0)
 540                 set_brightness(samsung, 1);
 541
 542         initial_level = read_brightness(samsung);
 543
 544         if (initial_level <= 2)
 545                 check_level = initial_level + 2;
 546         else
 547                 check_level = initial_level - 2;
 548
 549         samsung->has_stepping_quirk = false;
 550         set_brightness(samsung, check_level);
 551
 552         if (read_brightness(samsung) != check_level) {
 553                 samsung->has_stepping_quirk = true;
 554                 pr_info("enabled workaround for brightness stepping quirk\n");
 555         }
 556
 557         set_brightness(samsung, orig_level);
 558 }
 559
 560 static int update_status(struct backlight_device *bd)
 561 {
 562         struct samsung_laptop *samsung = bl_get_data(bd);
 563         const struct sabi_commands *commands = &samsung->config->commands;
 564
 565         set_brightness(samsung, bd->props.brightness);
 566
 567         if (bd->props.power == FB_BLANK_UNBLANK)
 568                 sabi_set_commandb(samsung, commands->set_backlight, 1);
 569         else
 570                 sabi_set_commandb(samsung, commands->set_backlight, 0);
 571
 572         return 0;
 573 }
 574
 575 static const struct backlight_ops backlight_ops = {
 576         .get_brightness = get_brightness,
 577         .update_status  = update_status,
 578 };
 579
 580 static int seclinux_rfkill_set(void *data, bool blocked)
 581 {
 582         struct samsung_rfkill *srfkill = data;
 583         struct samsung_laptop *samsung = srfkill->samsung;
 584         const struct sabi_commands *commands = &samsung->config->commands;
 585
 586         return sabi_set_commandb(samsung, commands->set_wireless_button,
 587                                  !blocked);
 588 }
 589
 590 static const struct rfkill_ops seclinux_rfkill_ops = {
 591         .set_block = seclinux_rfkill_set,
 592 };
 593
 594 static int swsmi_wireless_status(struct samsung_laptop *samsung,
 595                                  struct sabi_data *data)
 596 {
 597         const struct sabi_commands *commands = &samsung->config->commands;
 598
 599         return sabi_command(samsung, commands->get_wireless_status,
 600                             NULL, data);
 601 }
 602
 603 static int swsmi_rfkill_set(void *priv, bool blocked)
 604 {
 605         struct samsung_rfkill *srfkill = priv;
 606         struct samsung_laptop *samsung = srfkill->samsung;
 607         const struct sabi_commands *commands = &samsung->config->commands;
 608         struct sabi_data data;
 609         int ret, i;
 610
 611         ret = swsmi_wireless_status(samsung, &data);
 612         if (ret)
 613                 return ret;
 614
 615         /* Don't set the state for non-present devices */
 616         for (i = 0; i < 4; i++)
 617                 if (data.data[i] == 0x02)
 618                         data.data[1] = 0;
 619
 620         if (srfkill->type == RFKILL_TYPE_WLAN)
 621                 data.data[WL_STATUS_WLAN] = !blocked;
 622         else if (srfkill->type == RFKILL_TYPE_BLUETOOTH)
 623                 data.data[WL_STATUS_BT] = !blocked;
 624
 625         return sabi_command(samsung, commands->set_wireless_status,
 626                             &data, &data);
 627 }
 628
 629 static void swsmi_rfkill_query(struct rfkill *rfkill, void *priv)
 630 {
 631         struct samsung_rfkill *srfkill = priv;
 632         struct samsung_laptop *samsung = srfkill->samsung;
 633         struct sabi_data data;
 634         int ret;
 635
 636         ret = swsmi_wireless_status(samsung, &data);
 637         if (ret)
 638                 return ;
 639
 640         if (srfkill->type == RFKILL_TYPE_WLAN)
 641                 ret = data.data[WL_STATUS_WLAN];
 642         else if (srfkill->type == RFKILL_TYPE_BLUETOOTH)
 643                 ret = data.data[WL_STATUS_BT];
 644         else
 645                 return ;
 646
 647         rfkill_set_sw_state(rfkill, !ret);
 648 }
 649
 650 static const struct rfkill_ops swsmi_rfkill_ops = {
 651         .set_block = swsmi_rfkill_set,
 652         .query = swsmi_rfkill_query,
 653 };
 654
 655 static ssize_t get_performance_level(struct device *dev,
 656                                      struct device_attribute *attr, char *buf)
 657 {
 658         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 659         const struct sabi_config *config = samsung->config;
 660         const struct sabi_commands *commands = &config->commands;
 661         struct sabi_data sretval;
 662         int retval;
 663         int i;
 664
 665         /* Read the state */
 666         retval = sabi_command(samsung, commands->get_performance_level,
 667                               NULL, &sretval);
 668         if (retval)
 669                 return retval;
 670
 671         /* The logic is backwards, yeah, lots of fun... */
 672         for (i = 0; config->performance_levels[i].name; ++i) {
 673                 if (sretval.data[0] == config->performance_levels[i].value)
 674                         return sprintf(buf, "%s\n", config->performance_levels[i].name);
 675         }
 676         return sprintf(buf, "%s\n", "unknown");
 677 }
 678
 679 static ssize_t set_performance_level(struct device *dev,
 680                                 struct device_attribute *attr, const char *buf,
 681                                 size_t count)
 682 {
 683         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 684         const struct sabi_config *config = samsung->config;
 685         const struct sabi_commands *commands = &config->commands;
 686         int i;
 687
 688         if (count < 1)
 689                 return count;
 690
 691         for (i = 0; config->performance_levels[i].name; ++i) {
 692                 const struct sabi_performance_level *level =
 693                         &config->performance_levels[i];
 694                 if (!strncasecmp(level->name, buf, strlen(level->name))) {
 695                         sabi_set_commandb(samsung,
 696                                           commands->set_performance_level,
 697                                           level->value);
 698                         break;
 699                 }
 700         }
 701
 702         if (!config->performance_levels[i].name)
 703                 return -EINVAL;
 704
 705         return count;
 706 }
 707
 708 static DEVICE_ATTR(performance_level, S_IWUSR | S_IRUGO,
 709                    get_performance_level, set_performance_level);
 710
 711 static int read_battery_life_extender(struct samsung_laptop *samsung)
 712 {
 713         const struct sabi_commands *commands = &samsung->config->commands;
 714         struct sabi_data data;
 715         int retval;
 716
 717         if (commands->get_battery_life_extender == 0xFFFF)
 718                 return -ENODEV;
 719
 720         memset(&data, 0, sizeof(data));
 721         data.data[0] = 0x80;
 722         retval = sabi_command(samsung, commands->get_battery_life_extender,
 723                               &data, &data);
 724
 725         if (retval)
 726                 return retval;
 727
 728         if (data.data[0] != 0 && data.data[0] != 1)
 729                 return -ENODEV;
 730
 731         return data.data[0];
 732 }
 733
 734 static int write_battery_life_extender(struct samsung_laptop *samsung,
 735                                        int enabled)
 736 {
 737         const struct sabi_commands *commands = &samsung->config->commands;
 738         struct sabi_data data;
 739
 740         memset(&data, 0, sizeof(data));
 741         data.data[0] = 0x80 | enabled;
 742         return sabi_command(samsung, commands->set_battery_life_extender,
 743                             &data, NULL);
 744 }
 745
 746 static ssize_t get_battery_life_extender(struct device *dev,
 747                                          struct device_attribute *attr,
 748                                          char *buf)
 749 {
 750         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 751         int ret;
 752
 753         ret = read_battery_life_extender(samsung);
 754         if (ret < 0)
 755                 return ret;
 756
 757         return sprintf(buf, "%d\n", ret);
 758 }
 759
 760 static ssize_t set_battery_life_extender(struct device *dev,
 761                                         struct device_attribute *attr,
 762                                         const char *buf, size_t count)
 763 {
 764         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 765         int ret, value;
 766
 767         if (!count || kstrtoint(buf, 0, &value) != 0)
 768                 return -EINVAL;
 769
 770         ret = write_battery_life_extender(samsung, !!value);
 771         if (ret < 0)
 772                 return ret;
 773
 774         return count;
 775 }
 776
 777 static DEVICE_ATTR(battery_life_extender, S_IWUSR | S_IRUGO,
 778                    get_battery_life_extender, set_battery_life_extender);
 779
 780 static int read_usb_charge(struct samsung_laptop *samsung)
 781 {
 782         const struct sabi_commands *commands = &samsung->config->commands;
 783         struct sabi_data data;
 784         int retval;
 785
 786         if (commands->get_usb_charge == 0xFFFF)
 787                 return -ENODEV;
 788
 789         memset(&data, 0, sizeof(data));
 790         data.data[0] = 0x80;
 791         retval = sabi_command(samsung, commands->get_usb_charge,
 792                               &data, &data);
 793
 794         if (retval)
 795                 return retval;
 796
 797         if (data.data[0] != 0 && data.data[0] != 1)
 798                 return -ENODEV;
 799
 800         return data.data[0];
 801 }
 802
 803 static int write_usb_charge(struct samsung_laptop *samsung,
 804                             int enabled)
 805 {
 806         const struct sabi_commands *commands = &samsung->config->commands;
 807         struct sabi_data data;
 808
 809         memset(&data, 0, sizeof(data));
 810         data.data[0] = 0x80 | enabled;
 811         return sabi_command(samsung, commands->set_usb_charge,
 812                             &data, NULL);
 813 }
 814
 815 static ssize_t get_usb_charge(struct device *dev,
 816                               struct device_attribute *attr,
 817                               char *buf)
 818 {
 819         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 820         int ret;
 821
 822         ret = read_usb_charge(samsung);
 823         if (ret < 0)
 824                 return ret;
 825
 826         return sprintf(buf, "%d\n", ret);
 827 }
 828
 829 static ssize_t set_usb_charge(struct device *dev,
 830                               struct device_attribute *attr,
 831                               const char *buf, size_t count)
 832 {
 833         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 834         int ret, value;
 835
 836         if (!count || kstrtoint(buf, 0, &value) != 0)
 837                 return -EINVAL;
 838
 839         ret = write_usb_charge(samsung, !!value);
 840         if (ret < 0)
 841                 return ret;
 842
 843         return count;
 844 }
 845
 846 static DEVICE_ATTR(usb_charge, S_IWUSR | S_IRUGO,
 847                    get_usb_charge, set_usb_charge);
 848
 849 static int read_lid_handling(struct samsung_laptop *samsung)
 850 {
 851         const struct sabi_commands *commands = &samsung->config->commands;
 852         struct sabi_data data;
 853         int retval;
 854
 855         if (commands->get_lid_handling == 0xFFFF)
 856                 return -ENODEV;
 857
 858         memset(&data, 0, sizeof(data));
 859         retval = sabi_command(samsung, commands->get_lid_handling,
 860                               &data, &data);
 861
 862         if (retval)
 863                 return retval;
 864
 865         return data.data[0] & 0x1;
 866 }
 867
 868 static int write_lid_handling(struct samsung_laptop *samsung,
 869                               int enabled)
 870 {
 871         const struct sabi_commands *commands = &samsung->config->commands;
 872         struct sabi_data data;
 873
 874         memset(&data, 0, sizeof(data));
 875         data.data[0] = 0x80 | enabled;
 876         return sabi_command(samsung, commands->set_lid_handling,
 877                             &data, NULL);
 878 }
 879
 880 static ssize_t get_lid_handling(struct device *dev,
 881                                 struct device_attribute *attr,
 882                                 char *buf)
 883 {
 884         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 885         int ret;
 886
 887         ret = read_lid_handling(samsung);
 888         if (ret < 0)
 889                 return ret;
 890
 891         return sprintf(buf, "%d\n", ret);
 892 }
 893
 894 static ssize_t set_lid_handling(struct device *dev,
 895                                 struct device_attribute *attr,
 896                                 const char *buf, size_t count)
 897 {
 898         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 899         int ret, value;
 900
 901         if (!count || kstrtoint(buf, 0, &value) != 0)
 902                 return -EINVAL;
 903
 904         ret = write_lid_handling(samsung, !!value);
 905         if (ret < 0)
 906                 return ret;
 907
 908         return count;
 909 }
 910
 911 static DEVICE_ATTR(lid_handling, S_IWUSR | S_IRUGO,
 912                    get_lid_handling, set_lid_handling);
 913
 914 static struct attribute *platform_attributes[] = {
 915         &dev_attr_performance_level.attr,
 916         &dev_attr_battery_life_extender.attr,
 917         &dev_attr_usb_charge.attr,
 918         &dev_attr_lid_handling.attr,
 919         NULL
 920 };
 921
 922 static int find_signature(void __iomem *memcheck, const char *testStr)
 923 {
 924         int i = 0;
 925         int loca;
 926
 927         for (loca = 0; loca < 0xffff; loca++) {
 928                 char temp = readb(memcheck + loca);
 929
 930                 if (temp == testStr[i]) {
 931                         if (i == strlen(testStr)-1)
 932                                 break;
 933                         ++i;
 934                 } else {
 935                         i = 0;
 936                 }
 937         }
 938         return loca;
 939 }
 940
 941 static void samsung_rfkill_exit(struct samsung_laptop *samsung)
 942 {
 943         if (samsung->wlan.rfkill) {
 944                 rfkill_unregister(samsung->wlan.rfkill);
 945                 rfkill_destroy(samsung->wlan.rfkill);
 946                 samsung->wlan.rfkill = NULL;
 947         }
 948         if (samsung->bluetooth.rfkill) {
 949                 rfkill_unregister(samsung->bluetooth.rfkill);
 950                 rfkill_destroy(samsung->bluetooth.rfkill);
 951                 samsung->bluetooth.rfkill = NULL;
 952         }
 953 }
 954
 955 static int samsung_new_rfkill(struct samsung_laptop *samsung,
 956                               struct samsung_rfkill *arfkill,
 957                               const char *name, enum rfkill_type type,
 958                               const struct rfkill_ops *ops,
 959                               int blocked)
 960 {
 961         struct rfkill **rfkill = &arfkill->rfkill;
 962         int ret;
 963
 964         arfkill->type = type;
 965         arfkill->samsung = samsung;
 966
 967         *rfkill = rfkill_alloc(name, &samsung->platform_device->dev,
 968                                type, ops, arfkill);
 969
 970         if (!*rfkill)
 971                 return -EINVAL;
 972
 973         if (blocked != -1)
 974                 rfkill_init_sw_state(*rfkill, blocked);
 975
 976         ret = rfkill_register(*rfkill);
 977         if (ret) {
 978                 rfkill_destroy(*rfkill);
 979                 *rfkill = NULL;
 980                 return ret;
 981         }
 982         return 0;
 983 }
 984
 985 static int __init samsung_rfkill_init_seclinux(struct samsung_laptop *samsung)
 986 {
 987         return samsung_new_rfkill(samsung, &samsung->wlan, "samsung-wlan",
 988                                   RFKILL_TYPE_WLAN, &seclinux_rfkill_ops, -1);
 989 }
 990
 991 static int __init samsung_rfkill_init_swsmi(struct samsung_laptop *samsung)
 992 {
 993         struct sabi_data data;
 994         int ret;
 995
 996         ret = swsmi_wireless_status(samsung, &data);
 997         if (ret) {
 998                 /* Some swsmi laptops use the old seclinux way to control
 999                  * wireless devices */
1000                 if (ret == -EINVAL)
1001                         ret = samsung_rfkill_init_seclinux(samsung);
1002                 return ret;
1003         }
1004
1005         /* 0x02 seems to mean that the device is no present/available */
1006
1007         if (data.data[WL_STATUS_WLAN] != 0x02)
1008                 ret = samsung_new_rfkill(samsung, &samsung->wlan,
1009                                          "samsung-wlan",
1010                                          RFKILL_TYPE_WLAN,
1011                                          &swsmi_rfkill_ops,
1012                                          !data.data[WL_STATUS_WLAN]);
1013         if (ret)
1014                 goto exit;
1015
1016         if (data.data[WL_STATUS_BT] != 0x02)
1017                 ret = samsung_new_rfkill(samsung, &samsung->bluetooth,
1018                                          "samsung-bluetooth",
1019                                          RFKILL_TYPE_BLUETOOTH,
1020                                          &swsmi_rfkill_ops,
1021                                          !data.data[WL_STATUS_BT]);
1022         if (ret)
1023                 goto exit;
1024
1025 exit:
1026         if (ret)
1027                 samsung_rfkill_exit(samsung);
1028
1029         return ret;
1030 }
1031
1032 static int __init samsung_rfkill_init(struct samsung_laptop *samsung)
1033 {
1034         if (samsung->config->sabi_version == 2)
1035                 return samsung_rfkill_init_seclinux(samsung);
1036         if (samsung->config->sabi_version == 3)
1037                 return samsung_rfkill_init_swsmi(samsung);
1038         return 0;
1039 }
1040
1041 static void samsung_lid_handling_exit(struct samsung_laptop *samsung)
1042 {
1043         if (samsung->quirks->lid_handling)
1044                 write_lid_handling(samsung, 0);
1045 }
1046
1047 static int __init samsung_lid_handling_init(struct samsung_laptop *samsung)
1048 {
1049         int retval = 0;
1050
1051         if (samsung->quirks->lid_handling)
1052                 retval = write_lid_handling(samsung, 1);
1053
1054         return retval;
1055 }
1056
1057 static int kbd_backlight_enable(struct samsung_laptop *samsung)
1058 {
1059         const struct sabi_commands *commands = &samsung->config->commands;
1060         struct sabi_data data;
1061         int retval;
1062
1063         if (commands->kbd_backlight == 0xFFFF)
1064                 return -ENODEV;
1065
1066         memset(&data, 0, sizeof(data));
1067         data.d0 = 0xaabb;
1068         retval = sabi_command(samsung, commands->kbd_backlight,
1069                               &data, &data);
1070
1071         if (retval)
1072                 return retval;
1073
1074         if (data.d0 != 0xccdd)
1075                 return -ENODEV;
1076         return 0;
1077 }
1078
1079 static int kbd_backlight_read(struct samsung_laptop *samsung)
1080 {
1081         const struct sabi_commands *commands = &samsung->config->commands;
1082         struct sabi_data data;
1083         int retval;
1084
1085         memset(&data, 0, sizeof(data));
1086         data.data[0] = 0x81;
1087         retval = sabi_command(samsung, commands->kbd_backlight,
1088                               &data, &data);
1089
1090         if (retval)
1091                 return retval;
1092
1093         return data.data[0];
1094 }
1095
1096 static int kbd_backlight_write(struct samsung_laptop *samsung, int brightness)
1097 {
1098         const struct sabi_commands *commands = &samsung->config->commands;
1099         struct sabi_data data;
1100
1101         memset(&data, 0, sizeof(data));
1102         data.d0 = 0x82 | ((brightness & 0xFF) << 8);
1103         return sabi_command(samsung, commands->kbd_backlight,
1104                             &data, NULL);
1105 }
1106
1107 static void kbd_led_update(struct work_struct *work)
1108 {
1109         struct samsung_laptop *samsung;
1110
1111         samsung = container_of(work, struct samsung_laptop, kbd_led_work);
1112         kbd_backlight_write(samsung, samsung->kbd_led_wk);
1113 }
1114
1115 static void kbd_led_set(struct led_classdev *led_cdev,
1116                         enum led_brightness value)
1117 {
1118         struct samsung_laptop *samsung;
1119
1120         samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
1121
1122         if (value > samsung->kbd_led.max_brightness)
1123                 value = samsung->kbd_led.max_brightness;
1124         else if (value < 0)
1125                 value = 0;
1126
1127         samsung->kbd_led_wk = value;
1128         queue_work(samsung->led_workqueue, &samsung->kbd_led_work);
1129 }
1130
1131 static enum led_brightness kbd_led_get(struct led_classdev *led_cdev)
1132 {
1133         struct samsung_laptop *samsung;
1134
1135         samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
1136         return kbd_backlight_read(samsung);
1137 }
1138
1139 static void samsung_leds_exit(struct samsung_laptop *samsung)
1140 {
1141         if (!IS_ERR_OR_NULL(samsung->kbd_led.dev))
1142                 led_classdev_unregister(&samsung->kbd_led);
1143         if (samsung->led_workqueue)
1144                 destroy_workqueue(samsung->led_workqueue);
1145 }
1146
1147 static int __init samsung_leds_init(struct samsung_laptop *samsung)
1148 {
1149         int ret = 0;
1150
1151         samsung->led_workqueue = create_singlethread_workqueue("led_workqueue");
1152         if (!samsung->led_workqueue)
1153                 return -ENOMEM;
1154
1155         if (kbd_backlight_enable(samsung) >= 0) {
1156                 INIT_WORK(&samsung->kbd_led_work, kbd_led_update);
1157
1158                 samsung->kbd_led.name = "samsung::kbd_backlight";
1159                 samsung->kbd_led.brightness_set = kbd_led_set;
1160                 samsung->kbd_led.brightness_get = kbd_led_get;
1161                 samsung->kbd_led.max_brightness = 8;
1162                 if (samsung->quirks->four_kbd_backlight_levels)
1163                         samsung->kbd_led.max_brightness = 4;
1164
1165                 ret = led_classdev_register(&samsung->platform_device->dev,
1166                                            &samsung->kbd_led);
1167         }
1168
1169         if (ret)
1170                 samsung_leds_exit(samsung);
1171
1172         return ret;
1173 }
1174
1175 static void samsung_backlight_exit(struct samsung_laptop *samsung)
1176 {
1177         if (samsung->backlight_device) {
1178                 backlight_device_unregister(samsung->backlight_device);
1179                 samsung->backlight_device = NULL;
1180         }
1181 }
1182
1183 static int __init samsung_backlight_init(struct samsung_laptop *samsung)
1184 {
1185         struct backlight_device *bd;
1186         struct backlight_properties props;
1187
1188         if (!samsung->handle_backlight)
1189                 return 0;
1190
1191         memset(&props, 0, sizeof(struct backlight_properties));
1192         props.type = BACKLIGHT_PLATFORM;
1193         props.max_brightness = samsung->config->max_brightness -
1194                 samsung->config->min_brightness;
1195
1196         bd = backlight_device_register("samsung",
1197                                        &samsung->platform_device->dev,
1198                                        samsung, &backlight_ops,
1199                                        &props);
1200         if (IS_ERR(bd))
1201                 return PTR_ERR(bd);
1202
1203         samsung->backlight_device = bd;
1204         samsung->backlight_device->props.brightness = read_brightness(samsung);
1205         samsung->backlight_device->props.power = FB_BLANK_UNBLANK;
1206         backlight_update_status(samsung->backlight_device);
1207
1208         return 0;
1209 }
1210
1211 static umode_t samsung_sysfs_is_visible(struct kobject *kobj,
1212                                         struct attribute *attr, int idx)
1213 {
1214         struct device *dev = container_of(kobj, struct device, kobj);
1215         struct samsung_laptop *samsung = dev_get_drvdata(dev);
1216         bool ok = true;
1217
1218         if (attr == &dev_attr_performance_level.attr)
1219                 ok = !!samsung->config->performance_levels[0].name;
1220         if (attr == &dev_attr_battery_life_extender.attr)
1221                 ok = !!(read_battery_life_extender(samsung) >= 0);
1222         if (attr == &dev_attr_usb_charge.attr)
1223                 ok = !!(read_usb_charge(samsung) >= 0);
1224         if (attr == &dev_attr_lid_handling.attr)
1225                 ok = !!(read_lid_handling(samsung) >= 0);
1226
1227         return ok ? attr->mode : 0;
1228 }
1229
1230 static const struct attribute_group platform_attribute_group = {
1231         .is_visible = samsung_sysfs_is_visible,
1232         .attrs = platform_attributes
1233 };
1234
1235 static void samsung_sysfs_exit(struct samsung_laptop *samsung)
1236 {
1237         struct platform_device *device = samsung->platform_device;
1238
1239         sysfs_remove_group(&device->dev.kobj, &platform_attribute_group);
1240 }
1241
1242 static int __init samsung_sysfs_init(struct samsung_laptop *samsung)
1243 {
1244         struct platform_device *device = samsung->platform_device;
1245
1246         return sysfs_create_group(&device->dev.kobj, &platform_attribute_group);
1247
1248 }
1249
1250 static int samsung_laptop_call_show(struct seq_file *m, void *data)
1251 {
1252         struct samsung_laptop *samsung = m->private;
1253         struct sabi_data *sdata = &samsung->debug.data;
1254         int ret;
1255
1256         seq_printf(m, "SABI 0x%04x {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
1257                    samsung->debug.command,
1258                    sdata->d0, sdata->d1, sdata->d2, sdata->d3);
1259
1260         ret = sabi_command(samsung, samsung->debug.command, sdata, sdata);
1261
1262         if (ret) {
1263                 seq_printf(m, "SABI command 0x%04x failed\n",
1264                            samsung->debug.command);
1265                 return ret;
1266         }
1267
1268         seq_printf(m, "SABI {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
1269                    sdata->d0, sdata->d1, sdata->d2, sdata->d3);
1270         return 0;
1271 }
1272 DEFINE_SHOW_ATTRIBUTE(samsung_laptop_call);
1273
1274 static void samsung_debugfs_exit(struct samsung_laptop *samsung)
1275 {
1276         debugfs_remove_recursive(samsung->debug.root);
1277 }
1278
1279 static void samsung_debugfs_init(struct samsung_laptop *samsung)
1280 {
1281         struct dentry *root;
1282
1283         root = debugfs_create_dir("samsung-laptop", NULL);
1284         samsung->debug.root = root;
1285
1286         samsung->debug.f0000_wrapper.data = samsung->f0000_segment;
1287         samsung->debug.f0000_wrapper.size = 0xffff;
1288
1289         samsung->debug.data_wrapper.data = &samsung->debug.data;
1290         samsung->debug.data_wrapper.size = sizeof(samsung->debug.data);
1291
1292         samsung->debug.sdiag_wrapper.data = samsung->sdiag;
1293         samsung->debug.sdiag_wrapper.size = strlen(samsung->sdiag);
1294
1295         debugfs_create_u16("command", S_IRUGO | S_IWUSR, root,
1296                            &samsung->debug.command);
1297         debugfs_create_u32("d0", S_IRUGO | S_IWUSR, root,
1298                            &samsung->debug.data.d0);
1299         debugfs_create_u32("d1", S_IRUGO | S_IWUSR, root,
1300                            &samsung->debug.data.d1);
1301         debugfs_create_u16("d2", S_IRUGO | S_IWUSR, root,
1302                            &samsung->debug.data.d2);
1303         debugfs_create_u8("d3", S_IRUGO | S_IWUSR, root,
1304                           &samsung->debug.data.d3);
1305         debugfs_create_blob("data", S_IRUGO | S_IWUSR, root,
1306                             &samsung->debug.data_wrapper);
1307         debugfs_create_blob("f0000_segment", S_IRUSR | S_IWUSR, root,
1308                             &samsung->debug.f0000_wrapper);
1309         debugfs_create_file("call", S_IFREG | S_IRUGO, root, samsung,
1310                             &samsung_laptop_call_fops);
1311         debugfs_create_blob("sdiag", S_IRUGO | S_IWUSR, root,
1312                             &samsung->debug.sdiag_wrapper);
1313 }
1314
1315 static void samsung_sabi_exit(struct samsung_laptop *samsung)
1316 {
1317         const struct sabi_config *config = samsung->config;
1318
1319         /* Turn off "Linux" mode in the BIOS */
1320         if (config && config->commands.set_linux != 0xff)
1321                 sabi_set_commandb(samsung, config->commands.set_linux, 0x80);
1322
1323         if (samsung->sabi_iface) {
1324                 iounmap(samsung->sabi_iface);
1325                 samsung->sabi_iface = NULL;
1326         }
1327         if (samsung->f0000_segment) {
1328                 iounmap(samsung->f0000_segment);
1329                 samsung->f0000_segment = NULL;
1330         }
1331
1332         samsung->config = NULL;
1333 }
1334
1335 static __init void samsung_sabi_infos(struct samsung_laptop *samsung, int loca,
1336                                       unsigned int ifaceP)
1337 {
1338         const struct sabi_config *config = samsung->config;
1339
1340         printk(KERN_DEBUG "This computer supports SABI==%x\n",
1341                loca + 0xf0000 - 6);
1342
1343         printk(KERN_DEBUG "SABI header:\n");
1344         printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",
1345                readw(samsung->sabi + config->header_offsets.port));
1346         printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
1347                readb(samsung->sabi + config->header_offsets.iface_func));
1348         printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
1349                readb(samsung->sabi + config->header_offsets.en_mem));
1350         printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
1351                readb(samsung->sabi + config->header_offsets.re_mem));
1352         printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
1353                readw(samsung->sabi + config->header_offsets.data_offset));
1354         printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
1355                readw(samsung->sabi + config->header_offsets.data_segment));
1356
1357         printk(KERN_DEBUG " SABI pointer = 0x%08x\n", ifaceP);
1358 }
1359
1360 static void __init samsung_sabi_diag(struct samsung_laptop *samsung)
1361 {
1362         int loca = find_signature(samsung->f0000_segment, "SDiaG@");
1363         int i;
1364
1365         if (loca == 0xffff)
1366                 return ;
1367
1368         /* Example:
1369          * Ident: @SDiaG@686XX-N90X3A/966-SEC-07HL-S90X3A
1370          *
1371          * Product name: 90X3A
1372          * BIOS Version: 07HL
1373          */
1374         loca += 1;
1375         for (i = 0; loca < 0xffff && i < sizeof(samsung->sdiag) - 1; loca++) {
1376                 char temp = readb(samsung->f0000_segment + loca);
1377
1378                 if (isalnum(temp) || temp == '/' || temp == '-')
1379                         samsung->sdiag[i++] = temp;
1380                 else
1381                         break ;
1382         }
1383
1384         if (debug && samsung->sdiag[0])
1385                 pr_info("sdiag: %s", samsung->sdiag);
1386 }
1387
1388 static int __init samsung_sabi_init(struct samsung_laptop *samsung)
1389 {
1390         const struct sabi_config *config = NULL;
1391         const struct sabi_commands *commands;
1392         unsigned int ifaceP;
1393         int loca = 0xffff;
1394         int ret = 0;
1395         int i;
1396
1397         samsung->f0000_segment = ioremap_nocache(0xf0000, 0xffff);
1398         if (!samsung->f0000_segment) {
1399                 if (debug || force)
1400                         pr_err("Can't map the segment at 0xf0000\n");
1401                 ret = -EINVAL;
1402                 goto exit;
1403         }
1404
1405         samsung_sabi_diag(samsung);
1406
1407         /* Try to find one of the signatures in memory to find the header */
1408         for (i = 0; sabi_configs[i].test_string != NULL; ++i) {
1409                 samsung->config = &sabi_configs[i];
1410                 loca = find_signature(samsung->f0000_segment,
1411                                       samsung->config->test_string);
1412                 if (loca != 0xffff)
1413                         break;
1414         }
1415
1416         if (loca == 0xffff) {
1417                 if (debug || force)
1418                         pr_err("This computer does not support SABI\n");
1419                 ret = -ENODEV;
1420                 goto exit;
1421         }
1422
1423         config = samsung->config;
1424         commands = &config->commands;
1425
1426         /* point to the SMI port Number */
1427         loca += 1;
1428         samsung->sabi = (samsung->f0000_segment + loca);
1429
1430         /* Get a pointer to the SABI Interface */
1431         ifaceP = (readw(samsung->sabi + config->header_offsets.data_segment) & 0x0ffff) << 4;
1432         ifaceP += readw(samsung->sabi + config->header_offsets.data_offset) & 0x0ffff;
1433
1434         if (debug)
1435                 samsung_sabi_infos(samsung, loca, ifaceP);
1436
1437         samsung->sabi_iface = ioremap_nocache(ifaceP, 16);
1438         if (!samsung->sabi_iface) {
1439                 pr_err("Can't remap %x\n", ifaceP);
1440                 ret = -EINVAL;
1441                 goto exit;
1442         }
1443
1444         /* Turn on "Linux" mode in the BIOS */
1445         if (commands->set_linux != 0xff) {
1446                 int retval = sabi_set_commandb(samsung,
1447                                                commands->set_linux, 0x81);
1448                 if (retval) {
1449                         pr_warn("Linux mode was not set!\n");
1450                         ret = -ENODEV;
1451                         goto exit;
1452                 }
1453         }
1454
1455         /* Check for stepping quirk */
1456         if (samsung->handle_backlight)
1457                 check_for_stepping_quirk(samsung);
1458
1459         pr_info("detected SABI interface: %s\n",
1460                 samsung->config->test_string);
1461
1462 exit:
1463         if (ret)
1464                 samsung_sabi_exit(samsung);
1465
1466         return ret;
1467 }
1468
1469 static void samsung_platform_exit(struct samsung_laptop *samsung)
1470 {
1471         if (samsung->platform_device) {
1472                 platform_device_unregister(samsung->platform_device);
1473                 samsung->platform_device = NULL;
1474         }
1475 }
1476
1477 static int samsung_pm_notification(struct notifier_block *nb,
1478                                    unsigned long val, void *ptr)
1479 {
1480         struct samsung_laptop *samsung;
1481
1482         samsung = container_of(nb, struct samsung_laptop, pm_nb);
1483         if (val == PM_POST_HIBERNATION &&
1484             samsung->quirks->enable_kbd_backlight)
1485                 kbd_backlight_enable(samsung);
1486
1487         if (val == PM_POST_HIBERNATION && samsung->quirks->lid_handling)
1488                 write_lid_handling(samsung, 1);
1489
1490         return 0;
1491 }
1492
1493 static int __init samsung_platform_init(struct samsung_laptop *samsung)
1494 {
1495         struct platform_device *pdev;
1496
1497         pdev = platform_device_register_simple("samsung", -1, NULL, 0);
1498         if (IS_ERR(pdev))
1499                 return PTR_ERR(pdev);
1500
1501         samsung->platform_device = pdev;
1502         platform_set_drvdata(samsung->platform_device, samsung);
1503         return 0;
1504 }
1505
1506 static struct samsung_quirks *quirks;
1507
1508 static int __init samsung_dmi_matched(const struct dmi_system_id *d)
1509 {
1510         quirks = d->driver_data;
1511         return 0;
1512 }
1513
1514 static const struct dmi_system_id samsung_dmi_table[] __initconst = {
1515         {
1516                 .matches = {
1517                         DMI_MATCH(DMI_SYS_VENDOR,
1518                                         "SAMSUNG ELECTRONICS CO., LTD."),
1519                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"), /* Portable */
1520                 },
1521         },
1522         {
1523                 .matches = {
1524                         DMI_MATCH(DMI_SYS_VENDOR,
1525                                         "SAMSUNG ELECTRONICS CO., LTD."),
1526                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /* Laptop */
1527                 },
1528         },
1529         {
1530                 .matches = {
1531                         DMI_MATCH(DMI_SYS_VENDOR,
1532                                         "SAMSUNG ELECTRONICS CO., LTD."),
1533                         DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /* Notebook */
1534                 },
1535         },
1536         {
1537                 .matches = {
1538                         DMI_MATCH(DMI_SYS_VENDOR,
1539                                         "SAMSUNG ELECTRONICS CO., LTD."),
1540                         DMI_MATCH(DMI_CHASSIS_TYPE, "14"), /* Sub-Notebook */
1541                 },
1542         },
1543         /* DMI ids for laptops with bad Chassis Type */
1544         {
1545           .ident = "R40/R41",
1546           .matches = {
1547                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1548                 DMI_MATCH(DMI_PRODUCT_NAME, "R40/R41"),
1549                 DMI_MATCH(DMI_BOARD_NAME, "R40/R41"),
1550                 },
1551         },
1552         /* Specific DMI ids for laptop with quirks */
1553         {
1554          .callback = samsung_dmi_matched,
1555          .ident = "N150P",
1556          .matches = {
1557                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1558                 DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
1559                 DMI_MATCH(DMI_BOARD_NAME, "N150P"),
1560                 },
1561          .driver_data = &samsung_use_native_backlight,
1562         },
1563         {
1564          .callback = samsung_dmi_matched,
1565          .ident = "N145P/N250P/N260P",
1566          .matches = {
1567                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1568                 DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
1569                 DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
1570                 },
1571          .driver_data = &samsung_use_native_backlight,
1572         },
1573         {
1574          .callback = samsung_dmi_matched,
1575          .ident = "N150/N210/N220",
1576          .matches = {
1577                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1578                 DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
1579                 DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
1580                 },
1581          .driver_data = &samsung_broken_acpi_video,
1582         },
1583         {
1584          .callback = samsung_dmi_matched,
1585          .ident = "NF110/NF210/NF310",
1586          .matches = {
1587                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1588                 DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
1589                 DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
1590                 },
1591          .driver_data = &samsung_broken_acpi_video,
1592         },
1593         {
1594          .callback = samsung_dmi_matched,
1595          .ident = "X360",
1596          .matches = {
1597                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1598                 DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
1599                 DMI_MATCH(DMI_BOARD_NAME, "X360"),
1600                 },
1601          .driver_data = &samsung_broken_acpi_video,
1602         },
1603         {
1604          .callback = samsung_dmi_matched,
1605          .ident = "N250P",
1606          .matches = {
1607                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1608                 DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
1609                 DMI_MATCH(DMI_BOARD_NAME, "N250P"),
1610                 },
1611          .driver_data = &samsung_use_native_backlight,
1612         },
1613         {
1614          .callback = samsung_dmi_matched,
1615          .ident = "NC210",
1616          .matches = {
1617                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1618                 DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
1619                 DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
1620                 },
1621          .driver_data = &samsung_broken_acpi_video,
1622         },
1623         {
1624          .callback = samsung_dmi_matched,
1625          .ident = "730U3E/740U3E",
1626          .matches = {
1627                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1628                 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
1629                 },
1630          .driver_data = &samsung_np740u3e,
1631         },
1632         {
1633          .callback = samsung_dmi_matched,
1634          .ident = "300V3Z/300V4Z/300V5Z",
1635          .matches = {
1636                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1637                 DMI_MATCH(DMI_PRODUCT_NAME, "300V3Z/300V4Z/300V5Z"),
1638                 },
1639          .driver_data = &samsung_lid_handling,
1640         },
1641         { },
1642 };
1643 MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
1644
1645 static struct platform_device *samsung_platform_device;
1646
1647 static int __init samsung_init(void)
1648 {
1649         struct samsung_laptop *samsung;
1650         int ret;
1651
1652         if (efi_enabled(EFI_BOOT))
1653                 return -ENODEV;
1654
1655         quirks = &samsung_unknown;
1656         if (!force && !dmi_check_system(samsung_dmi_table))
1657                 return -ENODEV;
1658
1659         samsung = kzalloc(sizeof(*samsung), GFP_KERNEL);
1660         if (!samsung)
1661                 return -ENOMEM;
1662
1663         mutex_init(&samsung->sabi_mutex);
1664         samsung->handle_backlight = true;
1665         samsung->quirks = quirks;
1666
1667 #ifdef CONFIG_ACPI
1668         if (samsung->quirks->broken_acpi_video)
1669                 acpi_video_set_dmi_backlight_type(acpi_backlight_vendor);
1670         if (samsung->quirks->use_native_backlight)
1671                 acpi_video_set_dmi_backlight_type(acpi_backlight_native);
1672
1673         if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
1674                 samsung->handle_backlight = false;
1675 #endif
1676
1677         ret = samsung_platform_init(samsung);
1678         if (ret)
1679                 goto error_platform;
1680
1681         ret = samsung_sabi_init(samsung);
1682         if (ret)
1683                 goto error_sabi;
1684
1685         ret = samsung_sysfs_init(samsung);
1686         if (ret)
1687                 goto error_sysfs;
1688
1689         ret = samsung_backlight_init(samsung);
1690         if (ret)
1691                 goto error_backlight;
1692
1693         ret = samsung_rfkill_init(samsung);
1694         if (ret)
1695                 goto error_rfkill;
1696
1697         ret = samsung_leds_init(samsung);
1698         if (ret)
1699                 goto error_leds;
1700
1701         ret = samsung_lid_handling_init(samsung);
1702         if (ret)
1703                 goto error_lid_handling;
1704
1705         samsung_debugfs_init(samsung);
1706
1707         samsung->pm_nb.notifier_call = samsung_pm_notification;
1708         register_pm_notifier(&samsung->pm_nb);
1709
1710         samsung_platform_device = samsung->platform_device;
1711         return ret;
1712
1713 error_lid_handling:
1714         samsung_leds_exit(samsung);
1715 error_leds:
1716         samsung_rfkill_exit(samsung);
1717 error_rfkill:
1718         samsung_backlight_exit(samsung);
1719 error_backlight:
1720         samsung_sysfs_exit(samsung);
1721 error_sysfs:
1722         samsung_sabi_exit(samsung);
1723 error_sabi:
1724         samsung_platform_exit(samsung);
1725 error_platform:
1726         kfree(samsung);
1727         return ret;
1728 }
1729
1730 static void __exit samsung_exit(void)
1731 {
1732         struct samsung_laptop *samsung;
1733
1734         samsung = platform_get_drvdata(samsung_platform_device);
1735         unregister_pm_notifier(&samsung->pm_nb);
1736
1737         samsung_debugfs_exit(samsung);
1738         samsung_lid_handling_exit(samsung);
1739         samsung_leds_exit(samsung);
1740         samsung_rfkill_exit(samsung);
1741         samsung_backlight_exit(samsung);
1742         samsung_sysfs_exit(samsung);
1743         samsung_sabi_exit(samsung);
1744         samsung_platform_exit(samsung);
1745
1746         kfree(samsung);
1747         samsung_platform_device = NULL;
1748 }
1749
1750 module_init(samsung_init);
1751 module_exit(samsung_exit);
1752
1753 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
1754 MODULE_DESCRIPTION("Samsung Backlight driver");
1755 MODULE_LICENSE("GPL");