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