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         /* 0x80 is off, 0x81 is on */
 128         u16 get_lid_handling;
 129         u16 set_lid_handling;
 130
 131         /* 0x81 to read, (0x82 | level << 8) to set, 0xaabb to enable */
 132         u16 kbd_backlight;
 133
 134         /*
 135          * Tell the BIOS that Linux is running on this machine.
 136          * 81 is on, 80 is off
 137          */
 138         u16 set_linux;
 139 };
 140
 141 struct sabi_performance_level {
 142         const char *name;
 143         u16 value;
 144 };
 145
 146 struct sabi_config {
 147         int sabi_version;
 148         const char *test_string;
 149         u16 main_function;
 150         const struct sabi_header_offsets header_offsets;
 151         const struct sabi_commands commands;
 152         const struct sabi_performance_level performance_levels[4];
 153         u8 min_brightness;
 154         u8 max_brightness;
 155 };
 156
 157 static const struct sabi_config sabi_configs[] = {
 158         {
 159                 /* I don't know if it is really 2, but it it is
 160                  * less than 3 anyway */
 161                 .sabi_version = 2,
 162
 163                 .test_string = "SECLINUX",
 164
 165                 .main_function = 0x4c49,
 166
 167                 .header_offsets = {
 168                         .port = 0x00,
 169                         .re_mem = 0x02,
 170                         .iface_func = 0x03,
 171                         .en_mem = 0x04,
 172                         .data_offset = 0x05,
 173                         .data_segment = 0x07,
 174                 },
 175
 176                 .commands = {
 177                         .get_brightness = 0x00,
 178                         .set_brightness = 0x01,
 179
 180                         .get_wireless_button = 0x02,
 181                         .set_wireless_button = 0x03,
 182
 183                         .get_backlight = 0x04,
 184                         .set_backlight = 0x05,
 185
 186                         .get_recovery_mode = 0x06,
 187                         .set_recovery_mode = 0x07,
 188
 189                         .get_performance_level = 0x08,
 190                         .set_performance_level = 0x09,
 191
 192                         .get_battery_life_extender = 0xFFFF,
 193                         .set_battery_life_extender = 0xFFFF,
 194
 195                         .get_usb_charge = 0xFFFF,
 196                         .set_usb_charge = 0xFFFF,
 197
 198                         .get_wireless_status = 0xFFFF,
 199                         .set_wireless_status = 0xFFFF,
 200
 201                         .get_lid_handling = 0xFFFF,
 202                         .set_lid_handling = 0xFFFF,
 203
 204                         .kbd_backlight = 0xFFFF,
 205
 206                         .set_linux = 0x0a,
 207                 },
 208
 209                 .performance_levels = {
 210                         {
 211                                 .name = "silent",
 212                                 .value = 0,
 213                         },
 214                         {
 215                                 .name = "normal",
 216                                 .value = 1,
 217                         },
 218                         { },
 219                 },
 220                 .min_brightness = 1,
 221                 .max_brightness = 8,
 222         },
 223         {
 224                 .sabi_version = 3,
 225
 226                 .test_string = "SwSmi@",
 227
 228                 .main_function = 0x5843,
 229
 230                 .header_offsets = {
 231                         .port = 0x00,
 232                         .re_mem = 0x04,
 233                         .iface_func = 0x02,
 234                         .en_mem = 0x03,
 235                         .data_offset = 0x05,
 236                         .data_segment = 0x07,
 237                 },
 238
 239                 .commands = {
 240                         .get_brightness = 0x10,
 241                         .set_brightness = 0x11,
 242
 243                         .get_wireless_button = 0x12,
 244                         .set_wireless_button = 0x13,
 245
 246                         .get_backlight = 0x2d,
 247                         .set_backlight = 0x2e,
 248
 249                         .get_recovery_mode = 0xff,
 250                         .set_recovery_mode = 0xff,
 251
 252                         .get_performance_level = 0x31,
 253                         .set_performance_level = 0x32,
 254
 255                         .get_battery_life_extender = 0x65,
 256                         .set_battery_life_extender = 0x66,
 257
 258                         .get_usb_charge = 0x67,
 259                         .set_usb_charge = 0x68,
 260
 261                         .get_wireless_status = 0x69,
 262                         .set_wireless_status = 0x6a,
 263
 264                         .get_lid_handling = 0x6d,
 265                         .set_lid_handling = 0x6e,
 266
 267                         .kbd_backlight = 0x78,
 268
 269                         .set_linux = 0xff,
 270                 },
 271
 272                 .performance_levels = {
 273                         {
 274                                 .name = "normal",
 275                                 .value = 0,
 276                         },
 277                         {
 278                                 .name = "silent",
 279                                 .value = 1,
 280                         },
 281                         {
 282                                 .name = "overclock",
 283                                 .value = 2,
 284                         },
 285                         { },
 286                 },
 287                 .min_brightness = 0,
 288                 .max_brightness = 8,
 289         },
 290         { },
 291 };
 292
 293 /*
 294  * samsung-laptop/    - debugfs root directory
 295  *   f0000_segment    - dump f0000 segment
 296  *   command          - current command
 297  *   data             - current data
 298  *   d0, d1, d2, d3   - data fields
 299  *   call             - call SABI using command and data
 300  *
 301  * This allow to call arbitrary sabi commands wihout
 302  * modifying the driver at all.
 303  * For example, setting the keyboard backlight brightness to 5
 304  *
 305  *  echo 0x78 > command
 306  *  echo 0x0582 > d0
 307  *  echo 0 > d1
 308  *  echo 0 > d2
 309  *  echo 0 > d3
 310  *  cat call
 311  */
 312
 313 struct samsung_laptop_debug {
 314         struct dentry *root;
 315         struct sabi_data data;
 316         u16 command;
 317
 318         struct debugfs_blob_wrapper f0000_wrapper;
 319         struct debugfs_blob_wrapper data_wrapper;
 320         struct debugfs_blob_wrapper sdiag_wrapper;
 321 };
 322
 323 struct samsung_laptop;
 324
 325 struct samsung_rfkill {
 326         struct samsung_laptop *samsung;
 327         struct rfkill *rfkill;
 328         enum rfkill_type type;
 329 };
 330
 331 struct samsung_laptop {
 332         const struct sabi_config *config;
 333
 334         void __iomem *sabi;
 335         void __iomem *sabi_iface;
 336         void __iomem *f0000_segment;
 337
 338         struct mutex sabi_mutex;
 339
 340         struct platform_device *platform_device;
 341         struct backlight_device *backlight_device;
 342
 343         struct samsung_rfkill wlan;
 344         struct samsung_rfkill bluetooth;
 345
 346         struct led_classdev kbd_led;
 347         int kbd_led_wk;
 348         struct workqueue_struct *led_workqueue;
 349         struct work_struct kbd_led_work;
 350
 351         struct samsung_laptop_debug debug;
 352         struct samsung_quirks *quirks;
 353
 354         struct notifier_block pm_nb;
 355
 356         bool handle_backlight;
 357         bool has_stepping_quirk;
 358
 359         char sdiag[64];
 360 };
 361
 362 struct samsung_quirks {
 363         bool broken_acpi_video;
 364         bool four_kbd_backlight_levels;
 365         bool enable_kbd_backlight;
 366         bool use_native_backlight;
 367         bool lid_handling;
 368 };
 369
 370 static struct samsung_quirks samsung_unknown = {};
 371
 372 static struct samsung_quirks samsung_broken_acpi_video = {
 373         .broken_acpi_video = true,
 374 };
 375
 376 static struct samsung_quirks samsung_use_native_backlight = {
 377         .use_native_backlight = true,
 378 };
 379
 380 static struct samsung_quirks samsung_np740u3e = {
 381         .four_kbd_backlight_levels = true,
 382         .enable_kbd_backlight = true,
 383 };
 384
 385 static struct samsung_quirks samsung_lid_handling = {
 386         .lid_handling = true,
 387 };
 388
 389 static bool force;
 390 module_param(force, bool, 0);
 391 MODULE_PARM_DESC(force,
 392                 "Disable the DMI check and forces the driver to be loaded");
 393
 394 static bool debug;
 395 module_param(debug, bool, S_IRUGO | S_IWUSR);
 396 MODULE_PARM_DESC(debug, "Debug enabled or not");
 397
 398 static int sabi_command(struct samsung_laptop *samsung, u16 command,
 399                         struct sabi_data *in,
 400                         struct sabi_data *out)
 401 {
 402         const struct sabi_config *config = samsung->config;
 403         int ret = 0;
 404         u16 port = readw(samsung->sabi + config->header_offsets.port);
 405         u8 complete, iface_data;
 406
 407         mutex_lock(&samsung->sabi_mutex);
 408
 409         if (debug) {
 410                 if (in)
 411                         pr_info("SABI command:0x%04x "
 412                                 "data:{0x%08x, 0x%08x, 0x%04x, 0x%02x}",
 413                                 command, in->d0, in->d1, in->d2, in->d3);
 414                 else
 415                         pr_info("SABI command:0x%04x", command);
 416         }
 417
 418         /* enable memory to be able to write to it */
 419         outb(readb(samsung->sabi + config->header_offsets.en_mem), port);
 420
 421         /* write out the command */
 422         writew(config->main_function, samsung->sabi_iface + SABI_IFACE_MAIN);
 423         writew(command, samsung->sabi_iface + SABI_IFACE_SUB);
 424         writeb(0, samsung->sabi_iface + SABI_IFACE_COMPLETE);
 425         if (in) {
 426                 writel(in->d0, samsung->sabi_iface + SABI_IFACE_DATA);
 427                 writel(in->d1, samsung->sabi_iface + SABI_IFACE_DATA + 4);
 428                 writew(in->d2, samsung->sabi_iface + SABI_IFACE_DATA + 8);
 429                 writeb(in->d3, samsung->sabi_iface + SABI_IFACE_DATA + 10);
 430         }
 431         outb(readb(samsung->sabi + config->header_offsets.iface_func), port);
 432
 433         /* write protect memory to make it safe */
 434         outb(readb(samsung->sabi + config->header_offsets.re_mem), port);
 435
 436         /* see if the command actually succeeded */
 437         complete = readb(samsung->sabi_iface + SABI_IFACE_COMPLETE);
 438         iface_data = readb(samsung->sabi_iface + SABI_IFACE_DATA);
 439
 440         /* iface_data = 0xFF happens when a command is not known
 441          * so we only add a warning in debug mode since we will
 442          * probably issue some unknown command at startup to find
 443          * out which features are supported */
 444         if (complete != 0xaa || (iface_data == 0xff && debug))
 445                 pr_warn("SABI command 0x%04x failed with"
 446                         " completion flag 0x%02x and interface data 0x%02x",
 447                         command, complete, iface_data);
 448
 449         if (complete != 0xaa || iface_data == 0xff) {
 450                 ret = -EINVAL;
 451                 goto exit;
 452         }
 453
 454         if (out) {
 455                 out->d0 = readl(samsung->sabi_iface + SABI_IFACE_DATA);
 456                 out->d1 = readl(samsung->sabi_iface + SABI_IFACE_DATA + 4);
 457                 out->d2 = readw(samsung->sabi_iface + SABI_IFACE_DATA + 2);
 458                 out->d3 = readb(samsung->sabi_iface + SABI_IFACE_DATA + 1);
 459         }
 460
 461         if (debug && out) {
 462                 pr_info("SABI return data:{0x%08x, 0x%08x, 0x%04x, 0x%02x}",
 463                         out->d0, out->d1, out->d2, out->d3);
 464         }
 465
 466 exit:
 467         mutex_unlock(&samsung->sabi_mutex);
 468         return ret;
 469 }
 470
 471 /* simple wrappers usable with most commands */
 472 static int sabi_set_commandb(struct samsung_laptop *samsung,
 473                              u16 command, u8 data)
 474 {
 475         struct sabi_data in = { { { .d0 = 0, .d1 = 0, .d2 = 0, .d3 = 0 } } };
 476
 477         in.data[0] = data;
 478         return sabi_command(samsung, command, &in, NULL);
 479 }
 480
 481 static int read_brightness(struct samsung_laptop *samsung)
 482 {
 483         const struct sabi_config *config = samsung->config;
 484         const struct sabi_commands *commands = &samsung->config->commands;
 485         struct sabi_data sretval;
 486         int user_brightness = 0;
 487         int retval;
 488
 489         retval = sabi_command(samsung, commands->get_brightness,
 490                               NULL, &sretval);
 491         if (retval)
 492                 return retval;
 493
 494         user_brightness = sretval.data[0];
 495         if (user_brightness > config->min_brightness)
 496                 user_brightness -= config->min_brightness;
 497         else
 498                 user_brightness = 0;
 499
 500         return user_brightness;
 501 }
 502
 503 static void set_brightness(struct samsung_laptop *samsung, u8 user_brightness)
 504 {
 505         const struct sabi_config *config = samsung->config;
 506         const struct sabi_commands *commands = &samsung->config->commands;
 507         u8 user_level = user_brightness + config->min_brightness;
 508
 509         if (samsung->has_stepping_quirk && user_level != 0) {
 510                 /*
 511                  * short circuit if the specified level is what's already set
 512                  * to prevent the screen from flickering needlessly
 513                  */
 514                 if (user_brightness == read_brightness(samsung))
 515                         return;
 516
 517                 sabi_set_commandb(samsung, commands->set_brightness, 0);
 518         }
 519
 520         sabi_set_commandb(samsung, commands->set_brightness, user_level);
 521 }
 522
 523 static int get_brightness(struct backlight_device *bd)
 524 {
 525         struct samsung_laptop *samsung = bl_get_data(bd);
 526
 527         return read_brightness(samsung);
 528 }
 529
 530 static void check_for_stepping_quirk(struct samsung_laptop *samsung)
 531 {
 532         int initial_level;
 533         int check_level;
 534         int orig_level = read_brightness(samsung);
 535
 536         /*
 537          * Some laptops exhibit the strange behaviour of stepping toward
 538          * (rather than setting) the brightness except when changing to/from
 539          * brightness level 0. This behaviour is checked for here and worked
 540          * around in set_brightness.
 541          */
 542
 543         if (orig_level == 0)
 544                 set_brightness(samsung, 1);
 545
 546         initial_level = read_brightness(samsung);
 547
 548         if (initial_level <= 2)
 549                 check_level = initial_level + 2;
 550         else
 551                 check_level = initial_level - 2;
 552
 553         samsung->has_stepping_quirk = false;
 554         set_brightness(samsung, check_level);
 555
 556         if (read_brightness(samsung) != check_level) {
 557                 samsung->has_stepping_quirk = true;
 558                 pr_info("enabled workaround for brightness stepping quirk\n");
 559         }
 560
 561         set_brightness(samsung, orig_level);
 562 }
 563
 564 static int update_status(struct backlight_device *bd)
 565 {
 566         struct samsung_laptop *samsung = bl_get_data(bd);
 567         const struct sabi_commands *commands = &samsung->config->commands;
 568
 569         set_brightness(samsung, bd->props.brightness);
 570
 571         if (bd->props.power == FB_BLANK_UNBLANK)
 572                 sabi_set_commandb(samsung, commands->set_backlight, 1);
 573         else
 574                 sabi_set_commandb(samsung, commands->set_backlight, 0);
 575
 576         return 0;
 577 }
 578
 579 static const struct backlight_ops backlight_ops = {
 580         .get_brightness = get_brightness,
 581         .update_status  = update_status,
 582 };
 583
 584 static int seclinux_rfkill_set(void *data, bool blocked)
 585 {
 586         struct samsung_rfkill *srfkill = data;
 587         struct samsung_laptop *samsung = srfkill->samsung;
 588         const struct sabi_commands *commands = &samsung->config->commands;
 589
 590         return sabi_set_commandb(samsung, commands->set_wireless_button,
 591                                  !blocked);
 592 }
 593
 594 static struct rfkill_ops seclinux_rfkill_ops = {
 595         .set_block = seclinux_rfkill_set,
 596 };
 597
 598 static int swsmi_wireless_status(struct samsung_laptop *samsung,
 599                                  struct sabi_data *data)
 600 {
 601         const struct sabi_commands *commands = &samsung->config->commands;
 602
 603         return sabi_command(samsung, commands->get_wireless_status,
 604                             NULL, data);
 605 }
 606
 607 static int swsmi_rfkill_set(void *priv, bool blocked)
 608 {
 609         struct samsung_rfkill *srfkill = priv;
 610         struct samsung_laptop *samsung = srfkill->samsung;
 611         const struct sabi_commands *commands = &samsung->config->commands;
 612         struct sabi_data data;
 613         int ret, i;
 614
 615         ret = swsmi_wireless_status(samsung, &data);
 616         if (ret)
 617                 return ret;
 618
 619         /* Don't set the state for non-present devices */
 620         for (i = 0; i < 4; i++)
 621                 if (data.data[i] == 0x02)
 622                         data.data[1] = 0;
 623
 624         if (srfkill->type == RFKILL_TYPE_WLAN)
 625                 data.data[WL_STATUS_WLAN] = !blocked;
 626         else if (srfkill->type == RFKILL_TYPE_BLUETOOTH)
 627                 data.data[WL_STATUS_BT] = !blocked;
 628
 629         return sabi_command(samsung, commands->set_wireless_status,
 630                             &data, &data);
 631 }
 632
 633 static void swsmi_rfkill_query(struct rfkill *rfkill, void *priv)
 634 {
 635         struct samsung_rfkill *srfkill = priv;
 636         struct samsung_laptop *samsung = srfkill->samsung;
 637         struct sabi_data data;
 638         int ret;
 639
 640         ret = swsmi_wireless_status(samsung, &data);
 641         if (ret)
 642                 return ;
 643
 644         if (srfkill->type == RFKILL_TYPE_WLAN)
 645                 ret = data.data[WL_STATUS_WLAN];
 646         else if (srfkill->type == RFKILL_TYPE_BLUETOOTH)
 647                 ret = data.data[WL_STATUS_BT];
 648         else
 649                 return ;
 650
 651         rfkill_set_sw_state(rfkill, !ret);
 652 }
 653
 654 static struct rfkill_ops swsmi_rfkill_ops = {
 655         .set_block = swsmi_rfkill_set,
 656         .query = swsmi_rfkill_query,
 657 };
 658
 659 static ssize_t get_performance_level(struct device *dev,
 660                                      struct device_attribute *attr, char *buf)
 661 {
 662         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 663         const struct sabi_config *config = samsung->config;
 664         const struct sabi_commands *commands = &config->commands;
 665         struct sabi_data sretval;
 666         int retval;
 667         int i;
 668
 669         /* Read the state */
 670         retval = sabi_command(samsung, commands->get_performance_level,
 671                               NULL, &sretval);
 672         if (retval)
 673                 return retval;
 674
 675         /* The logic is backwards, yeah, lots of fun... */
 676         for (i = 0; config->performance_levels[i].name; ++i) {
 677                 if (sretval.data[0] == config->performance_levels[i].value)
 678                         return sprintf(buf, "%s\n", config->performance_levels[i].name);
 679         }
 680         return sprintf(buf, "%s\n", "unknown");
 681 }
 682
 683 static ssize_t set_performance_level(struct device *dev,
 684                                 struct device_attribute *attr, const char *buf,
 685                                 size_t count)
 686 {
 687         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 688         const struct sabi_config *config = samsung->config;
 689         const struct sabi_commands *commands = &config->commands;
 690         int i;
 691
 692         if (count < 1)
 693                 return count;
 694
 695         for (i = 0; config->performance_levels[i].name; ++i) {
 696                 const struct sabi_performance_level *level =
 697                         &config->performance_levels[i];
 698                 if (!strncasecmp(level->name, buf, strlen(level->name))) {
 699                         sabi_set_commandb(samsung,
 700                                           commands->set_performance_level,
 701                                           level->value);
 702                         break;
 703                 }
 704         }
 705
 706         if (!config->performance_levels[i].name)
 707                 return -EINVAL;
 708
 709         return count;
 710 }
 711
 712 static DEVICE_ATTR(performance_level, S_IWUSR | S_IRUGO,
 713                    get_performance_level, set_performance_level);
 714
 715 static int read_battery_life_extender(struct samsung_laptop *samsung)
 716 {
 717         const struct sabi_commands *commands = &samsung->config->commands;
 718         struct sabi_data data;
 719         int retval;
 720
 721         if (commands->get_battery_life_extender == 0xFFFF)
 722                 return -ENODEV;
 723
 724         memset(&data, 0, sizeof(data));
 725         data.data[0] = 0x80;
 726         retval = sabi_command(samsung, commands->get_battery_life_extender,
 727                               &data, &data);
 728
 729         if (retval)
 730                 return retval;
 731
 732         if (data.data[0] != 0 && data.data[0] != 1)
 733                 return -ENODEV;
 734
 735         return data.data[0];
 736 }
 737
 738 static int write_battery_life_extender(struct samsung_laptop *samsung,
 739                                        int enabled)
 740 {
 741         const struct sabi_commands *commands = &samsung->config->commands;
 742         struct sabi_data data;
 743
 744         memset(&data, 0, sizeof(data));
 745         data.data[0] = 0x80 | enabled;
 746         return sabi_command(samsung, commands->set_battery_life_extender,
 747                             &data, NULL);
 748 }
 749
 750 static ssize_t get_battery_life_extender(struct device *dev,
 751                                          struct device_attribute *attr,
 752                                          char *buf)
 753 {
 754         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 755         int ret;
 756
 757         ret = read_battery_life_extender(samsung);
 758         if (ret < 0)
 759                 return ret;
 760
 761         return sprintf(buf, "%d\n", ret);
 762 }
 763
 764 static ssize_t set_battery_life_extender(struct device *dev,
 765                                         struct device_attribute *attr,
 766                                         const char *buf, size_t count)
 767 {
 768         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 769         int ret, value;
 770
 771         if (!count || kstrtoint(buf, 0, &value) != 0)
 772                 return -EINVAL;
 773
 774         ret = write_battery_life_extender(samsung, !!value);
 775         if (ret < 0)
 776                 return ret;
 777
 778         return count;
 779 }
 780
 781 static DEVICE_ATTR(battery_life_extender, S_IWUSR | S_IRUGO,
 782                    get_battery_life_extender, set_battery_life_extender);
 783
 784 static int read_usb_charge(struct samsung_laptop *samsung)
 785 {
 786         const struct sabi_commands *commands = &samsung->config->commands;
 787         struct sabi_data data;
 788         int retval;
 789
 790         if (commands->get_usb_charge == 0xFFFF)
 791                 return -ENODEV;
 792
 793         memset(&data, 0, sizeof(data));
 794         data.data[0] = 0x80;
 795         retval = sabi_command(samsung, commands->get_usb_charge,
 796                               &data, &data);
 797
 798         if (retval)
 799                 return retval;
 800
 801         if (data.data[0] != 0 && data.data[0] != 1)
 802                 return -ENODEV;
 803
 804         return data.data[0];
 805 }
 806
 807 static int write_usb_charge(struct samsung_laptop *samsung,
 808                             int enabled)
 809 {
 810         const struct sabi_commands *commands = &samsung->config->commands;
 811         struct sabi_data data;
 812
 813         memset(&data, 0, sizeof(data));
 814         data.data[0] = 0x80 | enabled;
 815         return sabi_command(samsung, commands->set_usb_charge,
 816                             &data, NULL);
 817 }
 818
 819 static ssize_t get_usb_charge(struct device *dev,
 820                               struct device_attribute *attr,
 821                               char *buf)
 822 {
 823         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 824         int ret;
 825
 826         ret = read_usb_charge(samsung);
 827         if (ret < 0)
 828                 return ret;
 829
 830         return sprintf(buf, "%d\n", ret);
 831 }
 832
 833 static ssize_t set_usb_charge(struct device *dev,
 834                               struct device_attribute *attr,
 835                               const char *buf, size_t count)
 836 {
 837         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 838         int ret, value;
 839
 840         if (!count || kstrtoint(buf, 0, &value) != 0)
 841                 return -EINVAL;
 842
 843         ret = write_usb_charge(samsung, !!value);
 844         if (ret < 0)
 845                 return ret;
 846
 847         return count;
 848 }
 849
 850 static DEVICE_ATTR(usb_charge, S_IWUSR | S_IRUGO,
 851                    get_usb_charge, set_usb_charge);
 852
 853 static int read_lid_handling(struct samsung_laptop *samsung)
 854 {
 855         const struct sabi_commands *commands = &samsung->config->commands;
 856         struct sabi_data data;
 857         int retval;
 858
 859         if (commands->get_lid_handling == 0xFFFF)
 860                 return -ENODEV;
 861
 862         memset(&data, 0, sizeof(data));
 863         retval = sabi_command(samsung, commands->get_lid_handling,
 864                               &data, &data);
 865
 866         if (retval)
 867                 return retval;
 868
 869         return data.data[0] & 0x1;
 870 }
 871
 872 static int write_lid_handling(struct samsung_laptop *samsung,
 873                               int enabled)
 874 {
 875         const struct sabi_commands *commands = &samsung->config->commands;
 876         struct sabi_data data;
 877
 878         memset(&data, 0, sizeof(data));
 879         data.data[0] = 0x80 | enabled;
 880         return sabi_command(samsung, commands->set_lid_handling,
 881                             &data, NULL);
 882 }
 883
 884 static ssize_t get_lid_handling(struct device *dev,
 885                                 struct device_attribute *attr,
 886                                 char *buf)
 887 {
 888         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 889         int ret;
 890
 891         ret = read_lid_handling(samsung);
 892         if (ret < 0)
 893                 return ret;
 894
 895         return sprintf(buf, "%d\n", ret);
 896 }
 897
 898 static ssize_t set_lid_handling(struct device *dev,
 899                                 struct device_attribute *attr,
 900                                 const char *buf, size_t count)
 901 {
 902         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 903         int ret, value;
 904
 905         if (!count || kstrtoint(buf, 0, &value) != 0)
 906                 return -EINVAL;
 907
 908         ret = write_lid_handling(samsung, !!value);
 909         if (ret < 0)
 910                 return ret;
 911
 912         return count;
 913 }
 914
 915 static DEVICE_ATTR(lid_handling, S_IWUSR | S_IRUGO,
 916                    get_lid_handling, set_lid_handling);
 917
 918 static struct attribute *platform_attributes[] = {
 919         &dev_attr_performance_level.attr,
 920         &dev_attr_battery_life_extender.attr,
 921         &dev_attr_usb_charge.attr,
 922         &dev_attr_lid_handling.attr,
 923         NULL
 924 };
 925
 926 static int find_signature(void __iomem *memcheck, const char *testStr)
 927 {
 928         int i = 0;
 929         int loca;
 930
 931         for (loca = 0; loca < 0xffff; loca++) {
 932                 char temp = readb(memcheck + loca);
 933
 934                 if (temp == testStr[i]) {
 935                         if (i == strlen(testStr)-1)
 936                                 break;
 937                         ++i;
 938                 } else {
 939                         i = 0;
 940                 }
 941         }
 942         return loca;
 943 }
 944
 945 static void samsung_rfkill_exit(struct samsung_laptop *samsung)
 946 {
 947         if (samsung->wlan.rfkill) {
 948                 rfkill_unregister(samsung->wlan.rfkill);
 949                 rfkill_destroy(samsung->wlan.rfkill);
 950                 samsung->wlan.rfkill = NULL;
 951         }
 952         if (samsung->bluetooth.rfkill) {
 953                 rfkill_unregister(samsung->bluetooth.rfkill);
 954                 rfkill_destroy(samsung->bluetooth.rfkill);
 955                 samsung->bluetooth.rfkill = NULL;
 956         }
 957 }
 958
 959 static int samsung_new_rfkill(struct samsung_laptop *samsung,
 960                               struct samsung_rfkill *arfkill,
 961                               const char *name, enum rfkill_type type,
 962                               const struct rfkill_ops *ops,
 963                               int blocked)
 964 {
 965         struct rfkill **rfkill = &arfkill->rfkill;
 966         int ret;
 967
 968         arfkill->type = type;
 969         arfkill->samsung = samsung;
 970
 971         *rfkill = rfkill_alloc(name, &samsung->platform_device->dev,
 972                                type, ops, arfkill);
 973
 974         if (!*rfkill)
 975                 return -EINVAL;
 976
 977         if (blocked != -1)
 978                 rfkill_init_sw_state(*rfkill, blocked);
 979
 980         ret = rfkill_register(*rfkill);
 981         if (ret) {
 982                 rfkill_destroy(*rfkill);
 983                 *rfkill = NULL;
 984                 return ret;
 985         }
 986         return 0;
 987 }
 988
 989 static int __init samsung_rfkill_init_seclinux(struct samsung_laptop *samsung)
 990 {
 991         return samsung_new_rfkill(samsung, &samsung->wlan, "samsung-wlan",
 992                                   RFKILL_TYPE_WLAN, &seclinux_rfkill_ops, -1);
 993 }
 994
 995 static int __init samsung_rfkill_init_swsmi(struct samsung_laptop *samsung)
 996 {
 997         struct sabi_data data;
 998         int ret;
 999
1000         ret = swsmi_wireless_status(samsung, &data);
1001         if (ret) {
1002                 /* Some swsmi laptops use the old seclinux way to control
1003                  * wireless devices */
1004                 if (ret == -EINVAL)
1005                         ret = samsung_rfkill_init_seclinux(samsung);
1006                 return ret;
1007         }
1008
1009         /* 0x02 seems to mean that the device is no present/available */
1010
1011         if (data.data[WL_STATUS_WLAN] != 0x02)
1012                 ret = samsung_new_rfkill(samsung, &samsung->wlan,
1013                                          "samsung-wlan",
1014                                          RFKILL_TYPE_WLAN,
1015                                          &swsmi_rfkill_ops,
1016                                          !data.data[WL_STATUS_WLAN]);
1017         if (ret)
1018                 goto exit;
1019
1020         if (data.data[WL_STATUS_BT] != 0x02)
1021                 ret = samsung_new_rfkill(samsung, &samsung->bluetooth,
1022                                          "samsung-bluetooth",
1023                                          RFKILL_TYPE_BLUETOOTH,
1024                                          &swsmi_rfkill_ops,
1025                                          !data.data[WL_STATUS_BT]);
1026         if (ret)
1027                 goto exit;
1028
1029 exit:
1030         if (ret)
1031                 samsung_rfkill_exit(samsung);
1032
1033         return ret;
1034 }
1035
1036 static int __init samsung_rfkill_init(struct samsung_laptop *samsung)
1037 {
1038         if (samsung->config->sabi_version == 2)
1039                 return samsung_rfkill_init_seclinux(samsung);
1040         if (samsung->config->sabi_version == 3)
1041                 return samsung_rfkill_init_swsmi(samsung);
1042         return 0;
1043 }
1044
1045 static void samsung_lid_handling_exit(struct samsung_laptop *samsung)
1046 {
1047         if (samsung->quirks->lid_handling)
1048                 write_lid_handling(samsung, 0);
1049 }
1050
1051 static int __init samsung_lid_handling_init(struct samsung_laptop *samsung)
1052 {
1053         int retval = 0;
1054
1055         if (samsung->quirks->lid_handling)
1056                 retval = write_lid_handling(samsung, 1);
1057
1058         return retval;
1059 }
1060
1061 static int kbd_backlight_enable(struct samsung_laptop *samsung)
1062 {
1063         const struct sabi_commands *commands = &samsung->config->commands;
1064         struct sabi_data data;
1065         int retval;
1066
1067         if (commands->kbd_backlight == 0xFFFF)
1068                 return -ENODEV;
1069
1070         memset(&data, 0, sizeof(data));
1071         data.d0 = 0xaabb;
1072         retval = sabi_command(samsung, commands->kbd_backlight,
1073                               &data, &data);
1074
1075         if (retval)
1076                 return retval;
1077
1078         if (data.d0 != 0xccdd)
1079                 return -ENODEV;
1080         return 0;
1081 }
1082
1083 static int kbd_backlight_read(struct samsung_laptop *samsung)
1084 {
1085         const struct sabi_commands *commands = &samsung->config->commands;
1086         struct sabi_data data;
1087         int retval;
1088
1089         memset(&data, 0, sizeof(data));
1090         data.data[0] = 0x81;
1091         retval = sabi_command(samsung, commands->kbd_backlight,
1092                               &data, &data);
1093
1094         if (retval)
1095                 return retval;
1096
1097         return data.data[0];
1098 }
1099
1100 static int kbd_backlight_write(struct samsung_laptop *samsung, int brightness)
1101 {
1102         const struct sabi_commands *commands = &samsung->config->commands;
1103         struct sabi_data data;
1104
1105         memset(&data, 0, sizeof(data));
1106         data.d0 = 0x82 | ((brightness & 0xFF) << 8);
1107         return sabi_command(samsung, commands->kbd_backlight,
1108                             &data, NULL);
1109 }
1110
1111 static void kbd_led_update(struct work_struct *work)
1112 {
1113         struct samsung_laptop *samsung;
1114
1115         samsung = container_of(work, struct samsung_laptop, kbd_led_work);
1116         kbd_backlight_write(samsung, samsung->kbd_led_wk);
1117 }
1118
1119 static void kbd_led_set(struct led_classdev *led_cdev,
1120                         enum led_brightness value)
1121 {
1122         struct samsung_laptop *samsung;
1123
1124         samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
1125
1126         if (value > samsung->kbd_led.max_brightness)
1127                 value = samsung->kbd_led.max_brightness;
1128
1129         samsung->kbd_led_wk = value;
1130         queue_work(samsung->led_workqueue, &samsung->kbd_led_work);
1131 }
1132
1133 static enum led_brightness kbd_led_get(struct led_classdev *led_cdev)
1134 {
1135         struct samsung_laptop *samsung;
1136
1137         samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
1138         return kbd_backlight_read(samsung);
1139 }
1140
1141 static void samsung_leds_exit(struct samsung_laptop *samsung)
1142 {
1143         if (!IS_ERR_OR_NULL(samsung->kbd_led.dev))
1144                 led_classdev_unregister(&samsung->kbd_led);
1145         if (samsung->led_workqueue)
1146                 destroy_workqueue(samsung->led_workqueue);
1147 }
1148
1149 static int __init samsung_leds_init(struct samsung_laptop *samsung)
1150 {
1151         int ret = 0;
1152
1153         samsung->led_workqueue = create_singlethread_workqueue("led_workqueue");
1154         if (!samsung->led_workqueue)
1155                 return -ENOMEM;
1156
1157         if (kbd_backlight_enable(samsung) >= 0) {
1158                 INIT_WORK(&samsung->kbd_led_work, kbd_led_update);
1159
1160                 samsung->kbd_led.name = "samsung::kbd_backlight";
1161                 samsung->kbd_led.brightness_set = kbd_led_set;
1162                 samsung->kbd_led.brightness_get = kbd_led_get;
1163                 samsung->kbd_led.max_brightness = 8;
1164                 if (samsung->quirks->four_kbd_backlight_levels)
1165                         samsung->kbd_led.max_brightness = 4;
1166
1167                 ret = led_classdev_register(&samsung->platform_device->dev,
1168                                            &samsung->kbd_led);
1169         }
1170
1171         if (ret)
1172                 samsung_leds_exit(samsung);
1173
1174         return ret;
1175 }
1176
1177 static void samsung_backlight_exit(struct samsung_laptop *samsung)
1178 {
1179         if (samsung->backlight_device) {
1180                 backlight_device_unregister(samsung->backlight_device);
1181                 samsung->backlight_device = NULL;
1182         }
1183 }
1184
1185 static int __init samsung_backlight_init(struct samsung_laptop *samsung)
1186 {
1187         struct backlight_device *bd;
1188         struct backlight_properties props;
1189
1190         if (!samsung->handle_backlight)
1191                 return 0;
1192
1193         memset(&props, 0, sizeof(struct backlight_properties));
1194         props.type = BACKLIGHT_PLATFORM;
1195         props.max_brightness = samsung->config->max_brightness -
1196                 samsung->config->min_brightness;
1197
1198         bd = backlight_device_register("samsung",
1199                                        &samsung->platform_device->dev,
1200                                        samsung, &backlight_ops,
1201                                        &props);
1202         if (IS_ERR(bd))
1203                 return PTR_ERR(bd);
1204
1205         samsung->backlight_device = bd;
1206         samsung->backlight_device->props.brightness = read_brightness(samsung);
1207         samsung->backlight_device->props.power = FB_BLANK_UNBLANK;
1208         backlight_update_status(samsung->backlight_device);
1209
1210         return 0;
1211 }
1212
1213 static umode_t samsung_sysfs_is_visible(struct kobject *kobj,
1214                                         struct attribute *attr, int idx)
1215 {
1216         struct device *dev = container_of(kobj, struct device, kobj);
1217         struct platform_device *pdev = to_platform_device(dev);
1218         struct samsung_laptop *samsung = platform_get_drvdata(pdev);
1219         bool ok = true;
1220
1221         if (attr == &dev_attr_performance_level.attr)
1222                 ok = !!samsung->config->performance_levels[0].name;
1223         if (attr == &dev_attr_battery_life_extender.attr)
1224                 ok = !!(read_battery_life_extender(samsung) >= 0);
1225         if (attr == &dev_attr_usb_charge.attr)
1226                 ok = !!(read_usb_charge(samsung) >= 0);
1227         if (attr == &dev_attr_lid_handling.attr)
1228                 ok = !!(read_lid_handling(samsung) >= 0);
1229
1230         return ok ? attr->mode : 0;
1231 }
1232
1233 static struct attribute_group platform_attribute_group = {
1234         .is_visible = samsung_sysfs_is_visible,
1235         .attrs = platform_attributes
1236 };
1237
1238 static void samsung_sysfs_exit(struct samsung_laptop *samsung)
1239 {
1240         struct platform_device *device = samsung->platform_device;
1241
1242         sysfs_remove_group(&device->dev.kobj, &platform_attribute_group);
1243 }
1244
1245 static int __init samsung_sysfs_init(struct samsung_laptop *samsung)
1246 {
1247         struct platform_device *device = samsung->platform_device;
1248
1249         return sysfs_create_group(&device->dev.kobj, &platform_attribute_group);
1250
1251 }
1252
1253 static int show_call(struct seq_file *m, void *data)
1254 {
1255         struct samsung_laptop *samsung = m->private;
1256         struct sabi_data *sdata = &samsung->debug.data;
1257         int ret;
1258
1259         seq_printf(m, "SABI 0x%04x {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
1260                    samsung->debug.command,
1261                    sdata->d0, sdata->d1, sdata->d2, sdata->d3);
1262
1263         ret = sabi_command(samsung, samsung->debug.command, sdata, sdata);
1264
1265         if (ret) {
1266                 seq_printf(m, "SABI command 0x%04x failed\n",
1267                            samsung->debug.command);
1268                 return ret;
1269         }
1270
1271         seq_printf(m, "SABI {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
1272                    sdata->d0, sdata->d1, sdata->d2, sdata->d3);
1273         return 0;
1274 }
1275
1276 static int samsung_debugfs_open(struct inode *inode, struct file *file)
1277 {
1278         return single_open(file, show_call, inode->i_private);
1279 }
1280
1281 static const struct file_operations samsung_laptop_call_io_ops = {
1282         .owner = THIS_MODULE,
1283         .open = samsung_debugfs_open,
1284         .read = seq_read,
1285         .llseek = seq_lseek,
1286         .release = single_release,
1287 };
1288
1289 static void samsung_debugfs_exit(struct samsung_laptop *samsung)
1290 {
1291         debugfs_remove_recursive(samsung->debug.root);
1292 }
1293
1294 static int samsung_debugfs_init(struct samsung_laptop *samsung)
1295 {
1296         struct dentry *dent;
1297
1298         samsung->debug.root = debugfs_create_dir("samsung-laptop", NULL);
1299         if (!samsung->debug.root) {
1300                 pr_err("failed to create debugfs directory");
1301                 goto error_debugfs;
1302         }
1303
1304         samsung->debug.f0000_wrapper.data = samsung->f0000_segment;
1305         samsung->debug.f0000_wrapper.size = 0xffff;
1306
1307         samsung->debug.data_wrapper.data = &samsung->debug.data;
1308         samsung->debug.data_wrapper.size = sizeof(samsung->debug.data);
1309
1310         samsung->debug.sdiag_wrapper.data = samsung->sdiag;
1311         samsung->debug.sdiag_wrapper.size = strlen(samsung->sdiag);
1312
1313         dent = debugfs_create_u16("command", S_IRUGO | S_IWUSR,
1314                                   samsung->debug.root, &samsung->debug.command);
1315         if (!dent)
1316                 goto error_debugfs;
1317
1318         dent = debugfs_create_u32("d0", S_IRUGO | S_IWUSR, samsung->debug.root,
1319                                   &samsung->debug.data.d0);
1320         if (!dent)
1321                 goto error_debugfs;
1322
1323         dent = debugfs_create_u32("d1", S_IRUGO | S_IWUSR, samsung->debug.root,
1324                                   &samsung->debug.data.d1);
1325         if (!dent)
1326                 goto error_debugfs;
1327
1328         dent = debugfs_create_u16("d2", S_IRUGO | S_IWUSR, samsung->debug.root,
1329                                   &samsung->debug.data.d2);
1330         if (!dent)
1331                 goto error_debugfs;
1332
1333         dent = debugfs_create_u8("d3", S_IRUGO | S_IWUSR, samsung->debug.root,
1334                                  &samsung->debug.data.d3);
1335         if (!dent)
1336                 goto error_debugfs;
1337
1338         dent = debugfs_create_blob("data", S_IRUGO | S_IWUSR,
1339                                    samsung->debug.root,
1340                                    &samsung->debug.data_wrapper);
1341         if (!dent)
1342                 goto error_debugfs;
1343
1344         dent = debugfs_create_blob("f0000_segment", S_IRUSR | S_IWUSR,
1345                                    samsung->debug.root,
1346                                    &samsung->debug.f0000_wrapper);
1347         if (!dent)
1348                 goto error_debugfs;
1349
1350         dent = debugfs_create_file("call", S_IFREG | S_IRUGO,
1351                                    samsung->debug.root, samsung,
1352                                    &samsung_laptop_call_io_ops);
1353         if (!dent)
1354                 goto error_debugfs;
1355
1356         dent = debugfs_create_blob("sdiag", S_IRUGO | S_IWUSR,
1357                                    samsung->debug.root,
1358                                    &samsung->debug.sdiag_wrapper);
1359         if (!dent)
1360                 goto error_debugfs;
1361
1362         return 0;
1363
1364 error_debugfs:
1365         samsung_debugfs_exit(samsung);
1366         return -ENOMEM;
1367 }
1368
1369 static void samsung_sabi_exit(struct samsung_laptop *samsung)
1370 {
1371         const struct sabi_config *config = samsung->config;
1372
1373         /* Turn off "Linux" mode in the BIOS */
1374         if (config && config->commands.set_linux != 0xff)
1375                 sabi_set_commandb(samsung, config->commands.set_linux, 0x80);
1376
1377         if (samsung->sabi_iface) {
1378                 iounmap(samsung->sabi_iface);
1379                 samsung->sabi_iface = NULL;
1380         }
1381         if (samsung->f0000_segment) {
1382                 iounmap(samsung->f0000_segment);
1383                 samsung->f0000_segment = NULL;
1384         }
1385
1386         samsung->config = NULL;
1387 }
1388
1389 static __init void samsung_sabi_infos(struct samsung_laptop *samsung, int loca,
1390                                       unsigned int ifaceP)
1391 {
1392         const struct sabi_config *config = samsung->config;
1393
1394         printk(KERN_DEBUG "This computer supports SABI==%x\n",
1395                loca + 0xf0000 - 6);
1396
1397         printk(KERN_DEBUG "SABI header:\n");
1398         printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",
1399                readw(samsung->sabi + config->header_offsets.port));
1400         printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
1401                readb(samsung->sabi + config->header_offsets.iface_func));
1402         printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
1403                readb(samsung->sabi + config->header_offsets.en_mem));
1404         printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
1405                readb(samsung->sabi + config->header_offsets.re_mem));
1406         printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
1407                readw(samsung->sabi + config->header_offsets.data_offset));
1408         printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
1409                readw(samsung->sabi + config->header_offsets.data_segment));
1410
1411         printk(KERN_DEBUG " SABI pointer = 0x%08x\n", ifaceP);
1412 }
1413
1414 static void __init samsung_sabi_diag(struct samsung_laptop *samsung)
1415 {
1416         int loca = find_signature(samsung->f0000_segment, "SDiaG@");
1417         int i;
1418
1419         if (loca == 0xffff)
1420                 return ;
1421
1422         /* Example:
1423          * Ident: @SDiaG@686XX-N90X3A/966-SEC-07HL-S90X3A
1424          *
1425          * Product name: 90X3A
1426          * BIOS Version: 07HL
1427          */
1428         loca += 1;
1429         for (i = 0; loca < 0xffff && i < sizeof(samsung->sdiag) - 1; loca++) {
1430                 char temp = readb(samsung->f0000_segment + loca);
1431
1432                 if (isalnum(temp) || temp == '/' || temp == '-')
1433                         samsung->sdiag[i++] = temp;
1434                 else
1435                         break ;
1436         }
1437
1438         if (debug && samsung->sdiag[0])
1439                 pr_info("sdiag: %s", samsung->sdiag);
1440 }
1441
1442 static int __init samsung_sabi_init(struct samsung_laptop *samsung)
1443 {
1444         const struct sabi_config *config = NULL;
1445         const struct sabi_commands *commands;
1446         unsigned int ifaceP;
1447         int ret = 0;
1448         int i;
1449         int loca;
1450
1451         samsung->f0000_segment = ioremap_nocache(0xf0000, 0xffff);
1452         if (!samsung->f0000_segment) {
1453                 if (debug || force)
1454                         pr_err("Can't map the segment at 0xf0000\n");
1455                 ret = -EINVAL;
1456                 goto exit;
1457         }
1458
1459         samsung_sabi_diag(samsung);
1460
1461         /* Try to find one of the signatures in memory to find the header */
1462         for (i = 0; sabi_configs[i].test_string != NULL; ++i) {
1463                 samsung->config = &sabi_configs[i];
1464                 loca = find_signature(samsung->f0000_segment,
1465                                       samsung->config->test_string);
1466                 if (loca != 0xffff)
1467                         break;
1468         }
1469
1470         if (loca == 0xffff) {
1471                 if (debug || force)
1472                         pr_err("This computer does not support SABI\n");
1473                 ret = -ENODEV;
1474                 goto exit;
1475         }
1476
1477         config = samsung->config;
1478         commands = &config->commands;
1479
1480         /* point to the SMI port Number */
1481         loca += 1;
1482         samsung->sabi = (samsung->f0000_segment + loca);
1483
1484         /* Get a pointer to the SABI Interface */
1485         ifaceP = (readw(samsung->sabi + config->header_offsets.data_segment) & 0x0ffff) << 4;
1486         ifaceP += readw(samsung->sabi + config->header_offsets.data_offset) & 0x0ffff;
1487
1488         if (debug)
1489                 samsung_sabi_infos(samsung, loca, ifaceP);
1490
1491         samsung->sabi_iface = ioremap_nocache(ifaceP, 16);
1492         if (!samsung->sabi_iface) {
1493                 pr_err("Can't remap %x\n", ifaceP);
1494                 ret = -EINVAL;
1495                 goto exit;
1496         }
1497
1498         /* Turn on "Linux" mode in the BIOS */
1499         if (commands->set_linux != 0xff) {
1500                 int retval = sabi_set_commandb(samsung,
1501                                                commands->set_linux, 0x81);
1502                 if (retval) {
1503                         pr_warn("Linux mode was not set!\n");
1504                         ret = -ENODEV;
1505                         goto exit;
1506                 }
1507         }
1508
1509         /* Check for stepping quirk */
1510         if (samsung->handle_backlight)
1511                 check_for_stepping_quirk(samsung);
1512
1513         pr_info("detected SABI interface: %s\n",
1514                 samsung->config->test_string);
1515
1516 exit:
1517         if (ret)
1518                 samsung_sabi_exit(samsung);
1519
1520         return ret;
1521 }
1522
1523 static void samsung_platform_exit(struct samsung_laptop *samsung)
1524 {
1525         if (samsung->platform_device) {
1526                 platform_device_unregister(samsung->platform_device);
1527                 samsung->platform_device = NULL;
1528         }
1529 }
1530
1531 static int samsung_pm_notification(struct notifier_block *nb,
1532                                    unsigned long val, void *ptr)
1533 {
1534         struct samsung_laptop *samsung;
1535
1536         samsung = container_of(nb, struct samsung_laptop, pm_nb);
1537         if (val == PM_POST_HIBERNATION &&
1538             samsung->quirks->enable_kbd_backlight)
1539                 kbd_backlight_enable(samsung);
1540
1541         if (val == PM_POST_HIBERNATION && samsung->quirks->lid_handling)
1542                 write_lid_handling(samsung, 1);
1543
1544         return 0;
1545 }
1546
1547 static int __init samsung_platform_init(struct samsung_laptop *samsung)
1548 {
1549         struct platform_device *pdev;
1550
1551         pdev = platform_device_register_simple("samsung", -1, NULL, 0);
1552         if (IS_ERR(pdev))
1553                 return PTR_ERR(pdev);
1554
1555         samsung->platform_device = pdev;
1556         platform_set_drvdata(samsung->platform_device, samsung);
1557         return 0;
1558 }
1559
1560 static struct samsung_quirks *quirks;
1561
1562 static int __init samsung_dmi_matched(const struct dmi_system_id *d)
1563 {
1564         quirks = d->driver_data;
1565         return 0;
1566 }
1567
1568 static struct dmi_system_id __initdata samsung_dmi_table[] = {
1569         {
1570                 .matches = {
1571                         DMI_MATCH(DMI_SYS_VENDOR,
1572                                         "SAMSUNG ELECTRONICS CO., LTD."),
1573                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"), /* Portable */
1574                 },
1575         },
1576         {
1577                 .matches = {
1578                         DMI_MATCH(DMI_SYS_VENDOR,
1579                                         "SAMSUNG ELECTRONICS CO., LTD."),
1580                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /* Laptop */
1581                 },
1582         },
1583         {
1584                 .matches = {
1585                         DMI_MATCH(DMI_SYS_VENDOR,
1586                                         "SAMSUNG ELECTRONICS CO., LTD."),
1587                         DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /* Notebook */
1588                 },
1589         },
1590         {
1591                 .matches = {
1592                         DMI_MATCH(DMI_SYS_VENDOR,
1593                                         "SAMSUNG ELECTRONICS CO., LTD."),
1594                         DMI_MATCH(DMI_CHASSIS_TYPE, "14"), /* Sub-Notebook */
1595                 },
1596         },
1597         /* DMI ids for laptops with bad Chassis Type */
1598         {
1599           .ident = "R40/R41",
1600           .matches = {
1601                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1602                 DMI_MATCH(DMI_PRODUCT_NAME, "R40/R41"),
1603                 DMI_MATCH(DMI_BOARD_NAME, "R40/R41"),
1604                 },
1605         },
1606         /* Specific DMI ids for laptop with quirks */
1607         {
1608          .callback = samsung_dmi_matched,
1609          .ident = "N150P",
1610          .matches = {
1611                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1612                 DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
1613                 DMI_MATCH(DMI_BOARD_NAME, "N150P"),
1614                 },
1615          .driver_data = &samsung_use_native_backlight,
1616         },
1617         {
1618          .callback = samsung_dmi_matched,
1619          .ident = "N145P/N250P/N260P",
1620          .matches = {
1621                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1622                 DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
1623                 DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
1624                 },
1625          .driver_data = &samsung_use_native_backlight,
1626         },
1627         {
1628          .callback = samsung_dmi_matched,
1629          .ident = "N150/N210/N220",
1630          .matches = {
1631                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1632                 DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
1633                 DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
1634                 },
1635          .driver_data = &samsung_broken_acpi_video,
1636         },
1637         {
1638          .callback = samsung_dmi_matched,
1639          .ident = "NF110/NF210/NF310",
1640          .matches = {
1641                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1642                 DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
1643                 DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
1644                 },
1645          .driver_data = &samsung_broken_acpi_video,
1646         },
1647         {
1648          .callback = samsung_dmi_matched,
1649          .ident = "X360",
1650          .matches = {
1651                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1652                 DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
1653                 DMI_MATCH(DMI_BOARD_NAME, "X360"),
1654                 },
1655          .driver_data = &samsung_broken_acpi_video,
1656         },
1657         {
1658          .callback = samsung_dmi_matched,
1659          .ident = "N250P",
1660          .matches = {
1661                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1662                 DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
1663                 DMI_MATCH(DMI_BOARD_NAME, "N250P"),
1664                 },
1665          .driver_data = &samsung_use_native_backlight,
1666         },
1667         {
1668          .callback = samsung_dmi_matched,
1669          .ident = "NC210",
1670          .matches = {
1671                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1672                 DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
1673                 DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
1674                 },
1675          .driver_data = &samsung_broken_acpi_video,
1676         },
1677         {
1678          .callback = samsung_dmi_matched,
1679          .ident = "730U3E/740U3E",
1680          .matches = {
1681                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1682                 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
1683                 },
1684          .driver_data = &samsung_np740u3e,
1685         },
1686         {
1687          .callback = samsung_dmi_matched,
1688          .ident = "300V3Z/300V4Z/300V5Z",
1689          .matches = {
1690                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1691                 DMI_MATCH(DMI_PRODUCT_NAME, "300V3Z/300V4Z/300V5Z"),
1692                 },
1693          .driver_data = &samsung_lid_handling,
1694         },
1695         { },
1696 };
1697 MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
1698
1699 static struct platform_device *samsung_platform_device;
1700
1701 static int __init samsung_init(void)
1702 {
1703         struct samsung_laptop *samsung;
1704         int ret;
1705
1706         if (efi_enabled(EFI_BOOT))
1707                 return -ENODEV;
1708
1709         quirks = &samsung_unknown;
1710         if (!force && !dmi_check_system(samsung_dmi_table))
1711                 return -ENODEV;
1712
1713         samsung = kzalloc(sizeof(*samsung), GFP_KERNEL);
1714         if (!samsung)
1715                 return -ENOMEM;
1716
1717         mutex_init(&samsung->sabi_mutex);
1718         samsung->handle_backlight = true;
1719         samsung->quirks = quirks;
1720
1721 #ifdef CONFIG_ACPI
1722         if (samsung->quirks->broken_acpi_video)
1723                 acpi_video_set_dmi_backlight_type(acpi_backlight_vendor);
1724         if (samsung->quirks->use_native_backlight)
1725                 acpi_video_set_dmi_backlight_type(acpi_backlight_native);
1726
1727         if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
1728                 samsung->handle_backlight = false;
1729 #endif
1730
1731         ret = samsung_platform_init(samsung);
1732         if (ret)
1733                 goto error_platform;
1734
1735         ret = samsung_sabi_init(samsung);
1736         if (ret)
1737                 goto error_sabi;
1738
1739         ret = samsung_sysfs_init(samsung);
1740         if (ret)
1741                 goto error_sysfs;
1742
1743         ret = samsung_backlight_init(samsung);
1744         if (ret)
1745                 goto error_backlight;
1746
1747         ret = samsung_rfkill_init(samsung);
1748         if (ret)
1749                 goto error_rfkill;
1750
1751         ret = samsung_leds_init(samsung);
1752         if (ret)
1753                 goto error_leds;
1754
1755         ret = samsung_lid_handling_init(samsung);
1756         if (ret)
1757                 goto error_lid_handling;
1758
1759         ret = samsung_debugfs_init(samsung);
1760         if (ret)
1761                 goto error_debugfs;
1762
1763         samsung->pm_nb.notifier_call = samsung_pm_notification;
1764         register_pm_notifier(&samsung->pm_nb);
1765
1766         samsung_platform_device = samsung->platform_device;
1767         return ret;
1768
1769 error_debugfs:
1770         samsung_lid_handling_exit(samsung);
1771 error_lid_handling:
1772         samsung_leds_exit(samsung);
1773 error_leds:
1774         samsung_rfkill_exit(samsung);
1775 error_rfkill:
1776         samsung_backlight_exit(samsung);
1777 error_backlight:
1778         samsung_sysfs_exit(samsung);
1779 error_sysfs:
1780         samsung_sabi_exit(samsung);
1781 error_sabi:
1782         samsung_platform_exit(samsung);
1783 error_platform:
1784         kfree(samsung);
1785         return ret;
1786 }
1787
1788 static void __exit samsung_exit(void)
1789 {
1790         struct samsung_laptop *samsung;
1791
1792         samsung = platform_get_drvdata(samsung_platform_device);
1793         unregister_pm_notifier(&samsung->pm_nb);
1794
1795         samsung_debugfs_exit(samsung);
1796         samsung_lid_handling_exit(samsung);
1797         samsung_leds_exit(samsung);
1798         samsung_rfkill_exit(samsung);
1799         samsung_backlight_exit(samsung);
1800         samsung_sysfs_exit(samsung);
1801         samsung_sabi_exit(samsung);
1802         samsung_platform_exit(samsung);
1803
1804         kfree(samsung);
1805         samsung_platform_device = NULL;
1806 }
1807
1808 module_init(samsung_init);
1809 module_exit(samsung_exit);
1810
1811 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
1812 MODULE_DESCRIPTION("Samsung Backlight driver");
1813 MODULE_LICENSE("GPL");