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/fb.h>
  21 #include <linux/dmi.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/rfkill.h>
  24
  25 /*
  26  * This driver is needed because a number of Samsung laptops do not hook
  27  * their control settings through ACPI.  So we have to poke around in the
  28  * BIOS to do things like brightness values, and "special" key controls.
  29  */
  30
  31 /*
  32  * We have 0 - 8 as valid brightness levels.  The specs say that level 0 should
  33  * be reserved by the BIOS (which really doesn't make much sense), we tell
  34  * userspace that the value is 0 - 7 and then just tell the hardware 1 - 8
  35  */
  36 #define MAX_BRIGHT      0x07
  37
  38
  39 #define SABI_IFACE_MAIN                 0x00
  40 #define SABI_IFACE_SUB                  0x02
  41 #define SABI_IFACE_COMPLETE             0x04
  42 #define SABI_IFACE_DATA                 0x05
  43
  44 /* Structure to get data back to the calling function */
  45 struct sabi_retval {
  46         u8 retval[20];
  47 };
  48
  49 struct sabi_header_offsets {
  50         u8 port;
  51         u8 re_mem;
  52         u8 iface_func;
  53         u8 en_mem;
  54         u8 data_offset;
  55         u8 data_segment;
  56 };
  57
  58 struct sabi_commands {
  59         /*
  60          * Brightness is 0 - 8, as described above.
  61          * Value 0 is for the BIOS to use
  62          */
  63         u8 get_brightness;
  64         u8 set_brightness;
  65
  66         /*
  67          * first byte:
  68          * 0x00 - wireless is off
  69          * 0x01 - wireless is on
  70          * second byte:
  71          * 0x02 - 3G is off
  72          * 0x03 - 3G is on
  73          * TODO, verify 3G is correct, that doesn't seem right...
  74          */
  75         u8 get_wireless_button;
  76         u8 set_wireless_button;
  77
  78         /* 0 is off, 1 is on */
  79         u8 get_backlight;
  80         u8 set_backlight;
  81
  82         /*
  83          * 0x80 or 0x00 - no action
  84          * 0x81 - recovery key pressed
  85          */
  86         u8 get_recovery_mode;
  87         u8 set_recovery_mode;
  88
  89         /*
  90          * on seclinux: 0 is low, 1 is high,
  91          * on swsmi: 0 is normal, 1 is silent, 2 is turbo
  92          */
  93         u8 get_performance_level;
  94         u8 set_performance_level;
  95
  96         /*
  97          * Tell the BIOS that Linux is running on this machine.
  98          * 81 is on, 80 is off
  99          */
 100         u8 set_linux;
 101 };
 102
 103 struct sabi_performance_level {
 104         const char *name;
 105         u8 value;
 106 };
 107
 108 struct sabi_config {
 109         const char *test_string;
 110         u16 main_function;
 111         const struct sabi_header_offsets header_offsets;
 112         const struct sabi_commands commands;
 113         const struct sabi_performance_level performance_levels[4];
 114         u8 min_brightness;
 115         u8 max_brightness;
 116 };
 117
 118 static const struct sabi_config sabi_configs[] = {
 119         {
 120                 .test_string = "SECLINUX",
 121
 122                 .main_function = 0x4c49,
 123
 124                 .header_offsets = {
 125                         .port = 0x00,
 126                         .re_mem = 0x02,
 127                         .iface_func = 0x03,
 128                         .en_mem = 0x04,
 129                         .data_offset = 0x05,
 130                         .data_segment = 0x07,
 131                 },
 132
 133                 .commands = {
 134                         .get_brightness = 0x00,
 135                         .set_brightness = 0x01,
 136
 137                         .get_wireless_button = 0x02,
 138                         .set_wireless_button = 0x03,
 139
 140                         .get_backlight = 0x04,
 141                         .set_backlight = 0x05,
 142
 143                         .get_recovery_mode = 0x06,
 144                         .set_recovery_mode = 0x07,
 145
 146                         .get_performance_level = 0x08,
 147                         .set_performance_level = 0x09,
 148
 149                         .set_linux = 0x0a,
 150                 },
 151
 152                 .performance_levels = {
 153                         {
 154                                 .name = "silent",
 155                                 .value = 0,
 156                         },
 157                         {
 158                                 .name = "normal",
 159                                 .value = 1,
 160                         },
 161                         { },
 162                 },
 163                 .min_brightness = 1,
 164                 .max_brightness = 8,
 165         },
 166         {
 167                 .test_string = "SwSmi@",
 168
 169                 .main_function = 0x5843,
 170
 171                 .header_offsets = {
 172                         .port = 0x00,
 173                         .re_mem = 0x04,
 174                         .iface_func = 0x02,
 175                         .en_mem = 0x03,
 176                         .data_offset = 0x05,
 177                         .data_segment = 0x07,
 178                 },
 179
 180                 .commands = {
 181                         .get_brightness = 0x10,
 182                         .set_brightness = 0x11,
 183
 184                         .get_wireless_button = 0x12,
 185                         .set_wireless_button = 0x13,
 186
 187                         .get_backlight = 0x2d,
 188                         .set_backlight = 0x2e,
 189
 190                         .get_recovery_mode = 0xff,
 191                         .set_recovery_mode = 0xff,
 192
 193                         .get_performance_level = 0x31,
 194                         .set_performance_level = 0x32,
 195
 196                         .set_linux = 0xff,
 197                 },
 198
 199                 .performance_levels = {
 200                         {
 201                                 .name = "normal",
 202                                 .value = 0,
 203                         },
 204                         {
 205                                 .name = "silent",
 206                                 .value = 1,
 207                         },
 208                         {
 209                                 .name = "overclock",
 210                                 .value = 2,
 211                         },
 212                         { },
 213                 },
 214                 .min_brightness = 0,
 215                 .max_brightness = 8,
 216         },
 217         { },
 218 };
 219
 220 struct samsung_laptop {
 221         const struct sabi_config *config;
 222
 223         void __iomem *sabi;
 224         void __iomem *sabi_iface;
 225         void __iomem *f0000_segment;
 226
 227         struct mutex sabi_mutex;
 228
 229         struct platform_device *pdev;
 230         struct backlight_device *backlight_device;
 231         struct rfkill *rfk;
 232
 233         bool has_stepping_quirk;
 234 };
 235
 236 static struct samsung_laptop *samsung;
 237
 238 static bool force;
 239 module_param(force, bool, 0);
 240 MODULE_PARM_DESC(force,
 241                 "Disable the DMI check and forces the driver to be loaded");
 242
 243 static bool debug;
 244 module_param(debug, bool, S_IRUGO | S_IWUSR);
 245 MODULE_PARM_DESC(debug, "Debug enabled or not");
 246
 247 static int sabi_get_command(u8 command, struct sabi_retval *sretval)
 248 {
 249         const struct sabi_config *config = samsung->config;
 250         int retval = 0;
 251         u16 port = readw(samsung->sabi + config->header_offsets.port);
 252         u8 complete, iface_data;
 253
 254         mutex_lock(&samsung->sabi_mutex);
 255
 256         /* enable memory to be able to write to it */
 257         outb(readb(samsung->sabi + config->header_offsets.en_mem), port);
 258
 259         /* write out the command */
 260         writew(config->main_function, samsung->sabi_iface + SABI_IFACE_MAIN);
 261         writew(command, samsung->sabi_iface + SABI_IFACE_SUB);
 262         writeb(0, samsung->sabi_iface + SABI_IFACE_COMPLETE);
 263         outb(readb(samsung->sabi + config->header_offsets.iface_func), port);
 264
 265         /* write protect memory to make it safe */
 266         outb(readb(samsung->sabi + config->header_offsets.re_mem), port);
 267
 268         /* see if the command actually succeeded */
 269         complete = readb(samsung->sabi_iface + SABI_IFACE_COMPLETE);
 270         iface_data = readb(samsung->sabi_iface + SABI_IFACE_DATA);
 271         if (complete != 0xaa || iface_data == 0xff) {
 272                 pr_warn("SABI get command 0x%02x failed with completion flag 0x%02x and data 0x%02x\n",
 273                         command, complete, iface_data);
 274                 retval = -EINVAL;
 275                 goto exit;
 276         }
 277         /*
 278          * Save off the data into a structure so the caller use it.
 279          * Right now we only want the first 4 bytes,
 280          * There are commands that need more, but not for the ones we
 281          * currently care about.
 282          */
 283         sretval->retval[0] = readb(samsung->sabi_iface + SABI_IFACE_DATA);
 284         sretval->retval[1] = readb(samsung->sabi_iface + SABI_IFACE_DATA + 1);
 285         sretval->retval[2] = readb(samsung->sabi_iface + SABI_IFACE_DATA + 2);
 286         sretval->retval[3] = readb(samsung->sabi_iface + SABI_IFACE_DATA + 3);
 287
 288 exit:
 289         mutex_unlock(&samsung->sabi_mutex);
 290         return retval;
 291
 292 }
 293
 294 static int sabi_set_command(u8 command, u8 data)
 295 {
 296         const struct sabi_config *config = samsung->config;
 297         int retval = 0;
 298         u16 port = readw(samsung->sabi + config->header_offsets.port);
 299         u8 complete, iface_data;
 300
 301         mutex_lock(&samsung->sabi_mutex);
 302
 303         /* enable memory to be able to write to it */
 304         outb(readb(samsung->sabi + config->header_offsets.en_mem), port);
 305
 306         /* write out the command */
 307         writew(config->main_function, samsung->sabi_iface + SABI_IFACE_MAIN);
 308         writew(command, samsung->sabi_iface + SABI_IFACE_SUB);
 309         writeb(0, samsung->sabi_iface + SABI_IFACE_COMPLETE);
 310         writeb(data, samsung->sabi_iface + SABI_IFACE_DATA);
 311         outb(readb(samsung->sabi + config->header_offsets.iface_func), port);
 312
 313         /* write protect memory to make it safe */
 314         outb(readb(samsung->sabi + config->header_offsets.re_mem), port);
 315
 316         /* see if the command actually succeeded */
 317         complete = readb(samsung->sabi_iface + SABI_IFACE_COMPLETE);
 318         iface_data = readb(samsung->sabi_iface + SABI_IFACE_DATA);
 319         if (complete != 0xaa || iface_data == 0xff) {
 320                 pr_warn("SABI set command 0x%02x failed with completion flag 0x%02x and data 0x%02x\n",
 321                        command, complete, iface_data);
 322                 retval = -EINVAL;
 323         }
 324
 325         mutex_unlock(&samsung->sabi_mutex);
 326         return retval;
 327 }
 328
 329 static void test_backlight(void)
 330 {
 331         const struct sabi_commands *commands = &samsung->config->commands;
 332         struct sabi_retval sretval;
 333
 334         sabi_get_command(commands->get_backlight, &sretval);
 335         printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
 336
 337         sabi_set_command(commands->set_backlight, 0);
 338         printk(KERN_DEBUG "backlight should be off\n");
 339
 340         sabi_get_command(commands->get_backlight, &sretval);
 341         printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
 342
 343         msleep(1000);
 344
 345         sabi_set_command(commands->set_backlight, 1);
 346         printk(KERN_DEBUG "backlight should be on\n");
 347
 348         sabi_get_command(commands->get_backlight, &sretval);
 349         printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
 350 }
 351
 352 static void test_wireless(void)
 353 {
 354         const struct sabi_commands *commands = &samsung->config->commands;
 355         struct sabi_retval sretval;
 356
 357         sabi_get_command(commands->get_wireless_button, &sretval);
 358         printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
 359
 360         sabi_set_command(commands->set_wireless_button, 0);
 361         printk(KERN_DEBUG "wireless led should be off\n");
 362
 363         sabi_get_command(commands->get_wireless_button, &sretval);
 364         printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
 365
 366         msleep(1000);
 367
 368         sabi_set_command(commands->set_wireless_button, 1);
 369         printk(KERN_DEBUG "wireless led should be on\n");
 370
 371         sabi_get_command(commands->get_wireless_button, &sretval);
 372         printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
 373 }
 374
 375 static u8 read_brightness(void)
 376 {
 377         const struct sabi_config *config = samsung->config;
 378         const struct sabi_commands *commands = &samsung->config->commands;
 379         struct sabi_retval sretval;
 380         int user_brightness = 0;
 381         int retval;
 382
 383         retval = sabi_get_command(commands->get_brightness,
 384                                   &sretval);
 385         if (!retval) {
 386                 user_brightness = sretval.retval[0];
 387                 if (user_brightness > config->min_brightness)
 388                         user_brightness -= config->min_brightness;
 389                 else
 390                         user_brightness = 0;
 391         }
 392         return user_brightness;
 393 }
 394
 395 static void set_brightness(u8 user_brightness)
 396 {
 397         const struct sabi_config *config = samsung->config;
 398         const struct sabi_commands *commands = &samsung->config->commands;
 399         u8 user_level = user_brightness + config->min_brightness;
 400
 401         if (samsung->has_stepping_quirk && user_level != 0) {
 402                 /*
 403                  * short circuit if the specified level is what's already set
 404                  * to prevent the screen from flickering needlessly
 405                  */
 406                 if (user_brightness == read_brightness())
 407                         return;
 408
 409                 sabi_set_command(commands->set_brightness, 0);
 410         }
 411
 412         sabi_set_command(commands->set_brightness, user_level);
 413 }
 414
 415 static int get_brightness(struct backlight_device *bd)
 416 {
 417         return (int)read_brightness();
 418 }
 419
 420 static void check_for_stepping_quirk(void)
 421 {
 422         u8 initial_level;
 423         u8 check_level;
 424         u8 orig_level = read_brightness();
 425
 426         /*
 427          * Some laptops exhibit the strange behaviour of stepping toward
 428          * (rather than setting) the brightness except when changing to/from
 429          * brightness level 0. This behaviour is checked for here and worked
 430          * around in set_brightness.
 431          */
 432
 433         if (orig_level == 0)
 434                 set_brightness(1);
 435
 436         initial_level = read_brightness();
 437
 438         if (initial_level <= 2)
 439                 check_level = initial_level + 2;
 440         else
 441                 check_level = initial_level - 2;
 442
 443         samsung->has_stepping_quirk = false;
 444         set_brightness(check_level);
 445
 446         if (read_brightness() != check_level) {
 447                 samsung->has_stepping_quirk = true;
 448                 pr_info("enabled workaround for brightness stepping quirk\n");
 449         }
 450
 451         set_brightness(orig_level);
 452 }
 453
 454 static int update_status(struct backlight_device *bd)
 455 {
 456         const struct sabi_commands *commands = &samsung->config->commands;
 457
 458         set_brightness(bd->props.brightness);
 459
 460         if (bd->props.power == FB_BLANK_UNBLANK)
 461                 sabi_set_command(commands->set_backlight, 1);
 462         else
 463                 sabi_set_command(commands->set_backlight, 0);
 464         return 0;
 465 }
 466
 467 static const struct backlight_ops backlight_ops = {
 468         .get_brightness = get_brightness,
 469         .update_status  = update_status,
 470 };
 471
 472 static int rfkill_set(void *data, bool blocked)
 473 {
 474         const struct sabi_commands *commands = &samsung->config->commands;
 475
 476         /* Do something with blocked...*/
 477         /*
 478          * blocked == false is on
 479          * blocked == true is off
 480          */
 481         if (blocked)
 482                 sabi_set_command(commands->set_wireless_button, 0);
 483         else
 484                 sabi_set_command(commands->set_wireless_button, 1);
 485
 486         return 0;
 487 }
 488
 489 static struct rfkill_ops rfkill_ops = {
 490         .set_block = rfkill_set,
 491 };
 492
 493 static int init_wireless(struct platform_device *pdev)
 494 {
 495         int retval;
 496
 497         samsung->rfk = rfkill_alloc("samsung-wifi", &samsung->pdev->dev, RFKILL_TYPE_WLAN,
 498                                     &rfkill_ops, NULL);
 499         if (!samsung->rfk)
 500                 return -ENOMEM;
 501
 502         retval = rfkill_register(samsung->rfk);
 503         if (retval) {
 504                 rfkill_destroy(samsung->rfk);
 505                 return -ENODEV;
 506         }
 507
 508         return 0;
 509 }
 510
 511 static void destroy_wireless(void)
 512 {
 513         rfkill_unregister(samsung->rfk);
 514         rfkill_destroy(samsung->rfk);
 515 }
 516
 517 static ssize_t get_performance_level(struct device *dev,
 518                                      struct device_attribute *attr, char *buf)
 519 {
 520         const struct sabi_config *config = samsung->config;
 521         struct sabi_retval sretval;
 522         int retval;
 523         int i;
 524
 525         /* Read the state */
 526         retval = sabi_get_command(config->commands.get_performance_level,
 527                                   &sretval);
 528         if (retval)
 529                 return retval;
 530
 531         /* The logic is backwards, yeah, lots of fun... */
 532         for (i = 0; config->performance_levels[i].name; ++i) {
 533                 if (sretval.retval[0] == config->performance_levels[i].value)
 534                         return sprintf(buf, "%s\n", config->performance_levels[i].name);
 535         }
 536         return sprintf(buf, "%s\n", "unknown");
 537 }
 538
 539 static ssize_t set_performance_level(struct device *dev,
 540                                 struct device_attribute *attr, const char *buf,
 541                                 size_t count)
 542 {
 543         const struct sabi_config *config = samsung->config;
 544
 545         if (count >= 1) {
 546                 int i;
 547                 for (i = 0; config->performance_levels[i].name; ++i) {
 548                         const struct sabi_performance_level *level =
 549                                 &config->performance_levels[i];
 550                         if (!strncasecmp(level->name, buf, strlen(level->name))) {
 551                                 sabi_set_command(config->commands.set_performance_level,
 552                                                  level->value);
 553                                 break;
 554                         }
 555                 }
 556                 if (!config->performance_levels[i].name)
 557                         return -EINVAL;
 558         }
 559         return count;
 560 }
 561 static DEVICE_ATTR(performance_level, S_IWUSR | S_IRUGO,
 562                    get_performance_level, set_performance_level);
 563
 564
 565 static int __init dmi_check_cb(const struct dmi_system_id *id)
 566 {
 567         pr_info("found laptop model '%s'\n",
 568                 id->ident);
 569         return 1;
 570 }
 571
 572 static struct dmi_system_id __initdata samsung_dmi_table[] = {
 573         {
 574                 .ident = "N128",
 575                 .matches = {
 576                         DMI_MATCH(DMI_SYS_VENDOR,
 577                                         "SAMSUNG ELECTRONICS CO., LTD."),
 578                         DMI_MATCH(DMI_PRODUCT_NAME, "N128"),
 579                         DMI_MATCH(DMI_BOARD_NAME, "N128"),
 580                 },
 581                 .callback = dmi_check_cb,
 582         },
 583         {
 584                 .ident = "N130",
 585                 .matches = {
 586                         DMI_MATCH(DMI_SYS_VENDOR,
 587                                         "SAMSUNG ELECTRONICS CO., LTD."),
 588                         DMI_MATCH(DMI_PRODUCT_NAME, "N130"),
 589                         DMI_MATCH(DMI_BOARD_NAME, "N130"),
 590                 },
 591                 .callback = dmi_check_cb,
 592         },
 593         {
 594                 .ident = "N510",
 595                 .matches = {
 596                         DMI_MATCH(DMI_SYS_VENDOR,
 597                                         "SAMSUNG ELECTRONICS CO., LTD."),
 598                         DMI_MATCH(DMI_PRODUCT_NAME, "N510"),
 599                         DMI_MATCH(DMI_BOARD_NAME, "N510"),
 600                 },
 601                 .callback = dmi_check_cb,
 602         },
 603         {
 604                 .ident = "X125",
 605                 .matches = {
 606                         DMI_MATCH(DMI_SYS_VENDOR,
 607                                         "SAMSUNG ELECTRONICS CO., LTD."),
 608                         DMI_MATCH(DMI_PRODUCT_NAME, "X125"),
 609                         DMI_MATCH(DMI_BOARD_NAME, "X125"),
 610                 },
 611                 .callback = dmi_check_cb,
 612         },
 613         {
 614                 .ident = "X120/X170",
 615                 .matches = {
 616                         DMI_MATCH(DMI_SYS_VENDOR,
 617                                         "SAMSUNG ELECTRONICS CO., LTD."),
 618                         DMI_MATCH(DMI_PRODUCT_NAME, "X120/X170"),
 619                         DMI_MATCH(DMI_BOARD_NAME, "X120/X170"),
 620                 },
 621                 .callback = dmi_check_cb,
 622         },
 623         {
 624                 .ident = "NC10",
 625                 .matches = {
 626                         DMI_MATCH(DMI_SYS_VENDOR,
 627                                         "SAMSUNG ELECTRONICS CO., LTD."),
 628                         DMI_MATCH(DMI_PRODUCT_NAME, "NC10"),
 629                         DMI_MATCH(DMI_BOARD_NAME, "NC10"),
 630                 },
 631                 .callback = dmi_check_cb,
 632         },
 633                 {
 634                 .ident = "NP-Q45",
 635                 .matches = {
 636                         DMI_MATCH(DMI_SYS_VENDOR,
 637                                         "SAMSUNG ELECTRONICS CO., LTD."),
 638                         DMI_MATCH(DMI_PRODUCT_NAME, "SQ45S70S"),
 639                         DMI_MATCH(DMI_BOARD_NAME, "SQ45S70S"),
 640                 },
 641                 .callback = dmi_check_cb,
 642                 },
 643         {
 644                 .ident = "X360",
 645                 .matches = {
 646                         DMI_MATCH(DMI_SYS_VENDOR,
 647                                         "SAMSUNG ELECTRONICS CO., LTD."),
 648                         DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
 649                         DMI_MATCH(DMI_BOARD_NAME, "X360"),
 650                 },
 651                 .callback = dmi_check_cb,
 652         },
 653         {
 654                 .ident = "R410 Plus",
 655                 .matches = {
 656                         DMI_MATCH(DMI_SYS_VENDOR,
 657                                         "SAMSUNG ELECTRONICS CO., LTD."),
 658                         DMI_MATCH(DMI_PRODUCT_NAME, "R410P"),
 659                         DMI_MATCH(DMI_BOARD_NAME, "R460"),
 660                 },
 661                 .callback = dmi_check_cb,
 662         },
 663         {
 664                 .ident = "R518",
 665                 .matches = {
 666                         DMI_MATCH(DMI_SYS_VENDOR,
 667                                         "SAMSUNG ELECTRONICS CO., LTD."),
 668                         DMI_MATCH(DMI_PRODUCT_NAME, "R518"),
 669                         DMI_MATCH(DMI_BOARD_NAME, "R518"),
 670                 },
 671                 .callback = dmi_check_cb,
 672         },
 673         {
 674                 .ident = "R519/R719",
 675                 .matches = {
 676                         DMI_MATCH(DMI_SYS_VENDOR,
 677                                         "SAMSUNG ELECTRONICS CO., LTD."),
 678                         DMI_MATCH(DMI_PRODUCT_NAME, "R519/R719"),
 679                         DMI_MATCH(DMI_BOARD_NAME, "R519/R719"),
 680                 },
 681                 .callback = dmi_check_cb,
 682         },
 683         {
 684                 .ident = "N150/N210/N220",
 685                 .matches = {
 686                         DMI_MATCH(DMI_SYS_VENDOR,
 687                                         "SAMSUNG ELECTRONICS CO., LTD."),
 688                         DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
 689                         DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
 690                 },
 691                 .callback = dmi_check_cb,
 692         },
 693         {
 694                 .ident = "N220",
 695                 .matches = {
 696                         DMI_MATCH(DMI_SYS_VENDOR,
 697                                         "SAMSUNG ELECTRONICS CO., LTD."),
 698                         DMI_MATCH(DMI_PRODUCT_NAME, "N220"),
 699                         DMI_MATCH(DMI_BOARD_NAME, "N220"),
 700                 },
 701                 .callback = dmi_check_cb,
 702         },
 703         {
 704                 .ident = "N150/N210/N220/N230",
 705                 .matches = {
 706                         DMI_MATCH(DMI_SYS_VENDOR,
 707                                         "SAMSUNG ELECTRONICS CO., LTD."),
 708                         DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220/N230"),
 709                         DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220/N230"),
 710                 },
 711                 .callback = dmi_check_cb,
 712         },
 713         {
 714                 .ident = "N150P/N210P/N220P",
 715                 .matches = {
 716                         DMI_MATCH(DMI_SYS_VENDOR,
 717                                         "SAMSUNG ELECTRONICS CO., LTD."),
 718                         DMI_MATCH(DMI_PRODUCT_NAME, "N150P/N210P/N220P"),
 719                         DMI_MATCH(DMI_BOARD_NAME, "N150P/N210P/N220P"),
 720                 },
 721                 .callback = dmi_check_cb,
 722         },
 723         {
 724                 .ident = "R700",
 725                 .matches = {
 726                       DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 727                       DMI_MATCH(DMI_PRODUCT_NAME, "SR700"),
 728                       DMI_MATCH(DMI_BOARD_NAME, "SR700"),
 729                 },
 730                 .callback = dmi_check_cb,
 731         },
 732         {
 733                 .ident = "R530/R730",
 734                 .matches = {
 735                       DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 736                       DMI_MATCH(DMI_PRODUCT_NAME, "R530/R730"),
 737                       DMI_MATCH(DMI_BOARD_NAME, "R530/R730"),
 738                 },
 739                 .callback = dmi_check_cb,
 740         },
 741         {
 742                 .ident = "NF110/NF210/NF310",
 743                 .matches = {
 744                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 745                         DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
 746                         DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
 747                 },
 748                 .callback = dmi_check_cb,
 749         },
 750         {
 751                 .ident = "N145P/N250P/N260P",
 752                 .matches = {
 753                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 754                         DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
 755                         DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
 756                 },
 757                 .callback = dmi_check_cb,
 758         },
 759         {
 760                 .ident = "R70/R71",
 761                 .matches = {
 762                         DMI_MATCH(DMI_SYS_VENDOR,
 763                                         "SAMSUNG ELECTRONICS CO., LTD."),
 764                         DMI_MATCH(DMI_PRODUCT_NAME, "R70/R71"),
 765                         DMI_MATCH(DMI_BOARD_NAME, "R70/R71"),
 766                 },
 767                 .callback = dmi_check_cb,
 768         },
 769         {
 770                 .ident = "P460",
 771                 .matches = {
 772                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 773                         DMI_MATCH(DMI_PRODUCT_NAME, "P460"),
 774                         DMI_MATCH(DMI_BOARD_NAME, "P460"),
 775                 },
 776                 .callback = dmi_check_cb,
 777         },
 778         {
 779                 .ident = "R528/R728",
 780                 .matches = {
 781                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 782                         DMI_MATCH(DMI_PRODUCT_NAME, "R528/R728"),
 783                         DMI_MATCH(DMI_BOARD_NAME, "R528/R728"),
 784                 },
 785                 .callback = dmi_check_cb,
 786         },
 787         {
 788                 .ident = "NC210/NC110",
 789                 .matches = {
 790                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 791                         DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
 792                         DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
 793                 },
 794                 .callback = dmi_check_cb,
 795         },
 796                 {
 797                 .ident = "X520",
 798                 .matches = {
 799                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 800                         DMI_MATCH(DMI_PRODUCT_NAME, "X520"),
 801                         DMI_MATCH(DMI_BOARD_NAME, "X520"),
 802                 },
 803                 .callback = dmi_check_cb,
 804         },
 805         { },
 806 };
 807 MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
 808
 809 static int find_signature(void __iomem *memcheck, const char *testStr)
 810 {
 811         int i = 0;
 812         int loca;
 813
 814         for (loca = 0; loca < 0xffff; loca++) {
 815                 char temp = readb(memcheck + loca);
 816
 817                 if (temp == testStr[i]) {
 818                         if (i == strlen(testStr)-1)
 819                                 break;
 820                         ++i;
 821                 } else {
 822                         i = 0;
 823                 }
 824         }
 825         return loca;
 826 }
 827
 828 static int __init samsung_init(void)
 829 {
 830         const struct sabi_config *config = NULL;
 831         const struct sabi_commands *commands;
 832         struct backlight_device *bd;
 833         struct backlight_properties props;
 834         struct sabi_retval sretval;
 835         unsigned int ifaceP;
 836         int i;
 837         int loca;
 838         int retval;
 839
 840         if (!force && !dmi_check_system(samsung_dmi_table))
 841                 return -ENODEV;
 842
 843         samsung = kzalloc(sizeof(*samsung), GFP_KERNEL);
 844         if (!samsung)
 845                 return -ENOMEM;
 846
 847         mutex_init(&samsung->sabi_mutex);
 848
 849         samsung->f0000_segment = ioremap_nocache(0xf0000, 0xffff);
 850         if (!samsung->f0000_segment) {
 851                 pr_err("Can't map the segment at 0xf0000\n");
 852                 goto error_cant_map;
 853         }
 854
 855         /* Try to find one of the signatures in memory to find the header */
 856         for (i = 0; sabi_configs[i].test_string != 0; ++i) {
 857                 samsung->config = &sabi_configs[i];
 858                 loca = find_signature(samsung->f0000_segment,
 859                                       samsung->config->test_string);
 860                 if (loca != 0xffff)
 861                         break;
 862         }
 863
 864         if (loca == 0xffff) {
 865                 pr_err("This computer does not support SABI\n");
 866                 goto error_no_signature;
 867         }
 868
 869         config = samsung->config;
 870         commands = &config->commands;
 871
 872         /* point to the SMI port Number */
 873         loca += 1;
 874         samsung->sabi = (samsung->f0000_segment + loca);
 875
 876         if (debug) {
 877                 printk(KERN_DEBUG "This computer supports SABI==%x\n",
 878                         loca + 0xf0000 - 6);
 879                 printk(KERN_DEBUG "SABI header:\n");
 880                 printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",
 881                        readw(samsung->sabi +
 882                              config->header_offsets.port));
 883                 printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
 884                        readb(samsung->sabi +
 885                              config->header_offsets.iface_func));
 886                 printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
 887                        readb(samsung->sabi +
 888                              config->header_offsets.en_mem));
 889                 printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
 890                        readb(samsung->sabi +
 891                              config->header_offsets.re_mem));
 892                 printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
 893                        readw(samsung->sabi +
 894                              config->header_offsets.data_offset));
 895                 printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
 896                        readw(samsung->sabi +
 897                              config->header_offsets.data_segment));
 898         }
 899
 900         /* Get a pointer to the SABI Interface */
 901         ifaceP = (readw(samsung->sabi + config->header_offsets.data_segment) & 0x0ffff) << 4;
 902         ifaceP += readw(samsung->sabi + config->header_offsets.data_offset) & 0x0ffff;
 903         samsung->sabi_iface = ioremap_nocache(ifaceP, 16);
 904         if (!samsung->sabi_iface) {
 905                 pr_err("Can't remap %x\n", ifaceP);
 906                 goto error_no_signature;
 907         }
 908         if (debug) {
 909                 printk(KERN_DEBUG "ifaceP = 0x%08x\n", ifaceP);
 910                 printk(KERN_DEBUG "sabi_iface = %p\n", samsung->sabi_iface);
 911
 912                 test_backlight();
 913                 test_wireless();
 914
 915                 retval = sabi_get_command(commands->get_brightness,
 916                                           &sretval);
 917                 printk(KERN_DEBUG "brightness = 0x%02x\n", sretval.retval[0]);
 918         }
 919
 920         /* Turn on "Linux" mode in the BIOS */
 921         if (commands->set_linux != 0xff) {
 922                 retval = sabi_set_command(commands->set_linux,
 923                                           0x81);
 924                 if (retval) {
 925                         pr_warn("Linux mode was not set!\n");
 926                         goto error_no_platform;
 927                 }
 928         }
 929
 930         /* Check for stepping quirk */
 931         check_for_stepping_quirk();
 932
 933         /* knock up a platform device to hang stuff off of */
 934         samsung->pdev = platform_device_register_simple("samsung", -1, NULL, 0);
 935         if (IS_ERR(samsung->pdev))
 936                 goto error_no_platform;
 937
 938         /* create a backlight device to talk to this one */
 939         memset(&props, 0, sizeof(struct backlight_properties));
 940         props.type = BACKLIGHT_PLATFORM;
 941         props.max_brightness = config->max_brightness -
 942                                 config->min_brightness;
 943         bd = backlight_device_register("samsung", &samsung->pdev->dev,
 944                                        NULL, &backlight_ops,
 945                                        &props);
 946         if (IS_ERR(bd))
 947                 goto error_no_backlight;
 948
 949         samsung->backlight_device = bd;
 950         samsung->backlight_device->props.brightness = read_brightness();
 951         samsung->backlight_device->props.power = FB_BLANK_UNBLANK;
 952         backlight_update_status(samsung->backlight_device);
 953
 954         retval = init_wireless(samsung->pdev);
 955         if (retval)
 956                 goto error_no_rfk;
 957
 958         retval = device_create_file(&samsung->pdev->dev,
 959                                     &dev_attr_performance_level);
 960         if (retval)
 961                 goto error_file_create;
 962
 963         return 0;
 964
 965 error_file_create:
 966         destroy_wireless();
 967
 968 error_no_rfk:
 969         backlight_device_unregister(samsung->backlight_device);
 970
 971 error_no_backlight:
 972         platform_device_unregister(samsung->pdev);
 973
 974 error_no_platform:
 975         iounmap(samsung->sabi_iface);
 976
 977 error_no_signature:
 978         iounmap(samsung->f0000_segment);
 979
 980 error_cant_map:
 981         kfree(samsung);
 982         samsung = NULL;
 983         return -EINVAL;
 984 }
 985
 986 static void __exit samsung_exit(void)
 987 {
 988         const struct sabi_commands *commands = &samsung->config->commands;
 989
 990         /* Turn off "Linux" mode in the BIOS */
 991         if (commands->set_linux != 0xff)
 992                 sabi_set_command(commands->set_linux, 0x80);
 993
 994         device_remove_file(&samsung->pdev->dev, &dev_attr_performance_level);
 995         backlight_device_unregister(samsung->backlight_device);
 996         destroy_wireless();
 997         iounmap(samsung->sabi_iface);
 998         iounmap(samsung->f0000_segment);
 999         platform_device_unregister(samsung->pdev);
1000         kfree(samsung);
1001         samsung = NULL;
1002 }
1003
1004 module_init(samsung_init);
1005 module_exit(samsung_exit);
1006
1007 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
1008 MODULE_DESCRIPTION("Samsung Backlight driver");
1009 MODULE_LICENSE("GPL");