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 static const struct sabi_config *sabi_config;
 221
 222 static void __iomem *sabi;
 223 static void __iomem *sabi_iface;
 224 static void __iomem *f0000_segment;
 225 static struct backlight_device *backlight_device;
 226 static struct mutex sabi_mutex;
 227 static struct platform_device *sdev;
 228 static struct rfkill *rfk;
 229 static bool has_stepping_quirk;
 230
 231 static bool force;
 232 module_param(force, bool, 0);
 233 MODULE_PARM_DESC(force,
 234                 "Disable the DMI check and forces the driver to be loaded");
 235
 236 static bool debug;
 237 module_param(debug, bool, S_IRUGO | S_IWUSR);
 238 MODULE_PARM_DESC(debug, "Debug enabled or not");
 239
 240 static int sabi_get_command(u8 command, struct sabi_retval *sretval)
 241 {
 242         int retval = 0;
 243         u16 port = readw(sabi + sabi_config->header_offsets.port);
 244         u8 complete, iface_data;
 245
 246         mutex_lock(&sabi_mutex);
 247
 248         /* enable memory to be able to write to it */
 249         outb(readb(sabi + sabi_config->header_offsets.en_mem), port);
 250
 251         /* write out the command */
 252         writew(sabi_config->main_function, sabi_iface + SABI_IFACE_MAIN);
 253         writew(command, sabi_iface + SABI_IFACE_SUB);
 254         writeb(0, sabi_iface + SABI_IFACE_COMPLETE);
 255         outb(readb(sabi + sabi_config->header_offsets.iface_func), port);
 256
 257         /* write protect memory to make it safe */
 258         outb(readb(sabi + sabi_config->header_offsets.re_mem), port);
 259
 260         /* see if the command actually succeeded */
 261         complete = readb(sabi_iface + SABI_IFACE_COMPLETE);
 262         iface_data = readb(sabi_iface + SABI_IFACE_DATA);
 263         if (complete != 0xaa || iface_data == 0xff) {
 264                 pr_warn("SABI get command 0x%02x failed with completion flag 0x%02x and data 0x%02x\n",
 265                         command, complete, iface_data);
 266                 retval = -EINVAL;
 267                 goto exit;
 268         }
 269         /*
 270          * Save off the data into a structure so the caller use it.
 271          * Right now we only want the first 4 bytes,
 272          * There are commands that need more, but not for the ones we
 273          * currently care about.
 274          */
 275         sretval->retval[0] = readb(sabi_iface + SABI_IFACE_DATA);
 276         sretval->retval[1] = readb(sabi_iface + SABI_IFACE_DATA + 1);
 277         sretval->retval[2] = readb(sabi_iface + SABI_IFACE_DATA + 2);
 278         sretval->retval[3] = readb(sabi_iface + SABI_IFACE_DATA + 3);
 279
 280 exit:
 281         mutex_unlock(&sabi_mutex);
 282         return retval;
 283
 284 }
 285
 286 static int sabi_set_command(u8 command, u8 data)
 287 {
 288         int retval = 0;
 289         u16 port = readw(sabi + sabi_config->header_offsets.port);
 290         u8 complete, iface_data;
 291
 292         mutex_lock(&sabi_mutex);
 293
 294         /* enable memory to be able to write to it */
 295         outb(readb(sabi + sabi_config->header_offsets.en_mem), port);
 296
 297         /* write out the command */
 298         writew(sabi_config->main_function, sabi_iface + SABI_IFACE_MAIN);
 299         writew(command, sabi_iface + SABI_IFACE_SUB);
 300         writeb(0, sabi_iface + SABI_IFACE_COMPLETE);
 301         writeb(data, sabi_iface + SABI_IFACE_DATA);
 302         outb(readb(sabi + sabi_config->header_offsets.iface_func), port);
 303
 304         /* write protect memory to make it safe */
 305         outb(readb(sabi + sabi_config->header_offsets.re_mem), port);
 306
 307         /* see if the command actually succeeded */
 308         complete = readb(sabi_iface + SABI_IFACE_COMPLETE);
 309         iface_data = readb(sabi_iface + SABI_IFACE_DATA);
 310         if (complete != 0xaa || iface_data == 0xff) {
 311                 pr_warn("SABI set command 0x%02x failed with completion flag 0x%02x and data 0x%02x\n",
 312                        command, complete, iface_data);
 313                 retval = -EINVAL;
 314         }
 315
 316         mutex_unlock(&sabi_mutex);
 317         return retval;
 318 }
 319
 320 static void test_backlight(void)
 321 {
 322         struct sabi_retval sretval;
 323
 324         sabi_get_command(sabi_config->commands.get_backlight, &sretval);
 325         printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
 326
 327         sabi_set_command(sabi_config->commands.set_backlight, 0);
 328         printk(KERN_DEBUG "backlight should be off\n");
 329
 330         sabi_get_command(sabi_config->commands.get_backlight, &sretval);
 331         printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
 332
 333         msleep(1000);
 334
 335         sabi_set_command(sabi_config->commands.set_backlight, 1);
 336         printk(KERN_DEBUG "backlight should be on\n");
 337
 338         sabi_get_command(sabi_config->commands.get_backlight, &sretval);
 339         printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
 340 }
 341
 342 static void test_wireless(void)
 343 {
 344         struct sabi_retval sretval;
 345
 346         sabi_get_command(sabi_config->commands.get_wireless_button, &sretval);
 347         printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
 348
 349         sabi_set_command(sabi_config->commands.set_wireless_button, 0);
 350         printk(KERN_DEBUG "wireless led should be off\n");
 351
 352         sabi_get_command(sabi_config->commands.get_wireless_button, &sretval);
 353         printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
 354
 355         msleep(1000);
 356
 357         sabi_set_command(sabi_config->commands.set_wireless_button, 1);
 358         printk(KERN_DEBUG "wireless led should be on\n");
 359
 360         sabi_get_command(sabi_config->commands.get_wireless_button, &sretval);
 361         printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
 362 }
 363
 364 static u8 read_brightness(void)
 365 {
 366         struct sabi_retval sretval;
 367         int user_brightness = 0;
 368         int retval;
 369
 370         retval = sabi_get_command(sabi_config->commands.get_brightness,
 371                                   &sretval);
 372         if (!retval) {
 373                 user_brightness = sretval.retval[0];
 374                 if (user_brightness > sabi_config->min_brightness)
 375                         user_brightness -= sabi_config->min_brightness;
 376                 else
 377                         user_brightness = 0;
 378         }
 379         return user_brightness;
 380 }
 381
 382 static void set_brightness(u8 user_brightness)
 383 {
 384         u8 user_level = user_brightness + sabi_config->min_brightness;
 385
 386         if (has_stepping_quirk && user_level != 0) {
 387                 /*
 388                  * short circuit if the specified level is what's already set
 389                  * to prevent the screen from flickering needlessly
 390                  */
 391                 if (user_brightness == read_brightness())
 392                         return;
 393
 394                 sabi_set_command(sabi_config->commands.set_brightness, 0);
 395         }
 396
 397         sabi_set_command(sabi_config->commands.set_brightness, user_level);
 398 }
 399
 400 static int get_brightness(struct backlight_device *bd)
 401 {
 402         return (int)read_brightness();
 403 }
 404
 405 static void check_for_stepping_quirk(void)
 406 {
 407         u8 initial_level;
 408         u8 check_level;
 409         u8 orig_level = read_brightness();
 410
 411         /*
 412          * Some laptops exhibit the strange behaviour of stepping toward
 413          * (rather than setting) the brightness except when changing to/from
 414          * brightness level 0. This behaviour is checked for here and worked
 415          * around in set_brightness.
 416          */
 417
 418         if (orig_level == 0)
 419                 set_brightness(1);
 420
 421         initial_level = read_brightness();
 422
 423         if (initial_level <= 2)
 424                 check_level = initial_level + 2;
 425         else
 426                 check_level = initial_level - 2;
 427
 428         has_stepping_quirk = false;
 429         set_brightness(check_level);
 430
 431         if (read_brightness() != check_level) {
 432                 has_stepping_quirk = true;
 433                 pr_info("enabled workaround for brightness stepping quirk\n");
 434         }
 435
 436         set_brightness(orig_level);
 437 }
 438
 439 static int update_status(struct backlight_device *bd)
 440 {
 441         set_brightness(bd->props.brightness);
 442
 443         if (bd->props.power == FB_BLANK_UNBLANK)
 444                 sabi_set_command(sabi_config->commands.set_backlight, 1);
 445         else
 446                 sabi_set_command(sabi_config->commands.set_backlight, 0);
 447         return 0;
 448 }
 449
 450 static const struct backlight_ops backlight_ops = {
 451         .get_brightness = get_brightness,
 452         .update_status  = update_status,
 453 };
 454
 455 static int rfkill_set(void *data, bool blocked)
 456 {
 457         /* Do something with blocked...*/
 458         /*
 459          * blocked == false is on
 460          * blocked == true is off
 461          */
 462         if (blocked)
 463                 sabi_set_command(sabi_config->commands.set_wireless_button, 0);
 464         else
 465                 sabi_set_command(sabi_config->commands.set_wireless_button, 1);
 466
 467         return 0;
 468 }
 469
 470 static struct rfkill_ops rfkill_ops = {
 471         .set_block = rfkill_set,
 472 };
 473
 474 static int init_wireless(struct platform_device *sdev)
 475 {
 476         int retval;
 477
 478         rfk = rfkill_alloc("samsung-wifi", &sdev->dev, RFKILL_TYPE_WLAN,
 479                            &rfkill_ops, NULL);
 480         if (!rfk)
 481                 return -ENOMEM;
 482
 483         retval = rfkill_register(rfk);
 484         if (retval) {
 485                 rfkill_destroy(rfk);
 486                 return -ENODEV;
 487         }
 488
 489         return 0;
 490 }
 491
 492 static void destroy_wireless(void)
 493 {
 494         rfkill_unregister(rfk);
 495         rfkill_destroy(rfk);
 496 }
 497
 498 static ssize_t get_performance_level(struct device *dev,
 499                                      struct device_attribute *attr, char *buf)
 500 {
 501         struct sabi_retval sretval;
 502         int retval;
 503         int i;
 504
 505         /* Read the state */
 506         retval = sabi_get_command(sabi_config->commands.get_performance_level,
 507                                   &sretval);
 508         if (retval)
 509                 return retval;
 510
 511         /* The logic is backwards, yeah, lots of fun... */
 512         for (i = 0; sabi_config->performance_levels[i].name; ++i) {
 513                 if (sretval.retval[0] == sabi_config->performance_levels[i].value)
 514                         return sprintf(buf, "%s\n", sabi_config->performance_levels[i].name);
 515         }
 516         return sprintf(buf, "%s\n", "unknown");
 517 }
 518
 519 static ssize_t set_performance_level(struct device *dev,
 520                                 struct device_attribute *attr, const char *buf,
 521                                 size_t count)
 522 {
 523         if (count >= 1) {
 524                 int i;
 525                 for (i = 0; sabi_config->performance_levels[i].name; ++i) {
 526                         const struct sabi_performance_level *level =
 527                                 &sabi_config->performance_levels[i];
 528                         if (!strncasecmp(level->name, buf, strlen(level->name))) {
 529                                 sabi_set_command(sabi_config->commands.set_performance_level,
 530                                                  level->value);
 531                                 break;
 532                         }
 533                 }
 534                 if (!sabi_config->performance_levels[i].name)
 535                         return -EINVAL;
 536         }
 537         return count;
 538 }
 539 static DEVICE_ATTR(performance_level, S_IWUSR | S_IRUGO,
 540                    get_performance_level, set_performance_level);
 541
 542
 543 static int __init dmi_check_cb(const struct dmi_system_id *id)
 544 {
 545         pr_info("found laptop model '%s'\n",
 546                 id->ident);
 547         return 1;
 548 }
 549
 550 static struct dmi_system_id __initdata samsung_dmi_table[] = {
 551         {
 552                 .ident = "N128",
 553                 .matches = {
 554                         DMI_MATCH(DMI_SYS_VENDOR,
 555                                         "SAMSUNG ELECTRONICS CO., LTD."),
 556                         DMI_MATCH(DMI_PRODUCT_NAME, "N128"),
 557                         DMI_MATCH(DMI_BOARD_NAME, "N128"),
 558                 },
 559                 .callback = dmi_check_cb,
 560         },
 561         {
 562                 .ident = "N130",
 563                 .matches = {
 564                         DMI_MATCH(DMI_SYS_VENDOR,
 565                                         "SAMSUNG ELECTRONICS CO., LTD."),
 566                         DMI_MATCH(DMI_PRODUCT_NAME, "N130"),
 567                         DMI_MATCH(DMI_BOARD_NAME, "N130"),
 568                 },
 569                 .callback = dmi_check_cb,
 570         },
 571         {
 572                 .ident = "N510",
 573                 .matches = {
 574                         DMI_MATCH(DMI_SYS_VENDOR,
 575                                         "SAMSUNG ELECTRONICS CO., LTD."),
 576                         DMI_MATCH(DMI_PRODUCT_NAME, "N510"),
 577                         DMI_MATCH(DMI_BOARD_NAME, "N510"),
 578                 },
 579                 .callback = dmi_check_cb,
 580         },
 581         {
 582                 .ident = "X125",
 583                 .matches = {
 584                         DMI_MATCH(DMI_SYS_VENDOR,
 585                                         "SAMSUNG ELECTRONICS CO., LTD."),
 586                         DMI_MATCH(DMI_PRODUCT_NAME, "X125"),
 587                         DMI_MATCH(DMI_BOARD_NAME, "X125"),
 588                 },
 589                 .callback = dmi_check_cb,
 590         },
 591         {
 592                 .ident = "X120/X170",
 593                 .matches = {
 594                         DMI_MATCH(DMI_SYS_VENDOR,
 595                                         "SAMSUNG ELECTRONICS CO., LTD."),
 596                         DMI_MATCH(DMI_PRODUCT_NAME, "X120/X170"),
 597                         DMI_MATCH(DMI_BOARD_NAME, "X120/X170"),
 598                 },
 599                 .callback = dmi_check_cb,
 600         },
 601         {
 602                 .ident = "NC10",
 603                 .matches = {
 604                         DMI_MATCH(DMI_SYS_VENDOR,
 605                                         "SAMSUNG ELECTRONICS CO., LTD."),
 606                         DMI_MATCH(DMI_PRODUCT_NAME, "NC10"),
 607                         DMI_MATCH(DMI_BOARD_NAME, "NC10"),
 608                 },
 609                 .callback = dmi_check_cb,
 610         },
 611                 {
 612                 .ident = "NP-Q45",
 613                 .matches = {
 614                         DMI_MATCH(DMI_SYS_VENDOR,
 615                                         "SAMSUNG ELECTRONICS CO., LTD."),
 616                         DMI_MATCH(DMI_PRODUCT_NAME, "SQ45S70S"),
 617                         DMI_MATCH(DMI_BOARD_NAME, "SQ45S70S"),
 618                 },
 619                 .callback = dmi_check_cb,
 620                 },
 621         {
 622                 .ident = "X360",
 623                 .matches = {
 624                         DMI_MATCH(DMI_SYS_VENDOR,
 625                                         "SAMSUNG ELECTRONICS CO., LTD."),
 626                         DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
 627                         DMI_MATCH(DMI_BOARD_NAME, "X360"),
 628                 },
 629                 .callback = dmi_check_cb,
 630         },
 631         {
 632                 .ident = "R410 Plus",
 633                 .matches = {
 634                         DMI_MATCH(DMI_SYS_VENDOR,
 635                                         "SAMSUNG ELECTRONICS CO., LTD."),
 636                         DMI_MATCH(DMI_PRODUCT_NAME, "R410P"),
 637                         DMI_MATCH(DMI_BOARD_NAME, "R460"),
 638                 },
 639                 .callback = dmi_check_cb,
 640         },
 641         {
 642                 .ident = "R518",
 643                 .matches = {
 644                         DMI_MATCH(DMI_SYS_VENDOR,
 645                                         "SAMSUNG ELECTRONICS CO., LTD."),
 646                         DMI_MATCH(DMI_PRODUCT_NAME, "R518"),
 647                         DMI_MATCH(DMI_BOARD_NAME, "R518"),
 648                 },
 649                 .callback = dmi_check_cb,
 650         },
 651         {
 652                 .ident = "R519/R719",
 653                 .matches = {
 654                         DMI_MATCH(DMI_SYS_VENDOR,
 655                                         "SAMSUNG ELECTRONICS CO., LTD."),
 656                         DMI_MATCH(DMI_PRODUCT_NAME, "R519/R719"),
 657                         DMI_MATCH(DMI_BOARD_NAME, "R519/R719"),
 658                 },
 659                 .callback = dmi_check_cb,
 660         },
 661         {
 662                 .ident = "N150/N210/N220",
 663                 .matches = {
 664                         DMI_MATCH(DMI_SYS_VENDOR,
 665                                         "SAMSUNG ELECTRONICS CO., LTD."),
 666                         DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
 667                         DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
 668                 },
 669                 .callback = dmi_check_cb,
 670         },
 671         {
 672                 .ident = "N220",
 673                 .matches = {
 674                         DMI_MATCH(DMI_SYS_VENDOR,
 675                                         "SAMSUNG ELECTRONICS CO., LTD."),
 676                         DMI_MATCH(DMI_PRODUCT_NAME, "N220"),
 677                         DMI_MATCH(DMI_BOARD_NAME, "N220"),
 678                 },
 679                 .callback = dmi_check_cb,
 680         },
 681         {
 682                 .ident = "N150/N210/N220/N230",
 683                 .matches = {
 684                         DMI_MATCH(DMI_SYS_VENDOR,
 685                                         "SAMSUNG ELECTRONICS CO., LTD."),
 686                         DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220/N230"),
 687                         DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220/N230"),
 688                 },
 689                 .callback = dmi_check_cb,
 690         },
 691         {
 692                 .ident = "N150P/N210P/N220P",
 693                 .matches = {
 694                         DMI_MATCH(DMI_SYS_VENDOR,
 695                                         "SAMSUNG ELECTRONICS CO., LTD."),
 696                         DMI_MATCH(DMI_PRODUCT_NAME, "N150P/N210P/N220P"),
 697                         DMI_MATCH(DMI_BOARD_NAME, "N150P/N210P/N220P"),
 698                 },
 699                 .callback = dmi_check_cb,
 700         },
 701         {
 702                 .ident = "R700",
 703                 .matches = {
 704                       DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 705                       DMI_MATCH(DMI_PRODUCT_NAME, "SR700"),
 706                       DMI_MATCH(DMI_BOARD_NAME, "SR700"),
 707                 },
 708                 .callback = dmi_check_cb,
 709         },
 710         {
 711                 .ident = "R530/R730",
 712                 .matches = {
 713                       DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 714                       DMI_MATCH(DMI_PRODUCT_NAME, "R530/R730"),
 715                       DMI_MATCH(DMI_BOARD_NAME, "R530/R730"),
 716                 },
 717                 .callback = dmi_check_cb,
 718         },
 719         {
 720                 .ident = "NF110/NF210/NF310",
 721                 .matches = {
 722                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 723                         DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
 724                         DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
 725                 },
 726                 .callback = dmi_check_cb,
 727         },
 728         {
 729                 .ident = "N145P/N250P/N260P",
 730                 .matches = {
 731                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 732                         DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
 733                         DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
 734                 },
 735                 .callback = dmi_check_cb,
 736         },
 737         {
 738                 .ident = "R70/R71",
 739                 .matches = {
 740                         DMI_MATCH(DMI_SYS_VENDOR,
 741                                         "SAMSUNG ELECTRONICS CO., LTD."),
 742                         DMI_MATCH(DMI_PRODUCT_NAME, "R70/R71"),
 743                         DMI_MATCH(DMI_BOARD_NAME, "R70/R71"),
 744                 },
 745                 .callback = dmi_check_cb,
 746         },
 747         {
 748                 .ident = "P460",
 749                 .matches = {
 750                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 751                         DMI_MATCH(DMI_PRODUCT_NAME, "P460"),
 752                         DMI_MATCH(DMI_BOARD_NAME, "P460"),
 753                 },
 754                 .callback = dmi_check_cb,
 755         },
 756         {
 757                 .ident = "R528/R728",
 758                 .matches = {
 759                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 760                         DMI_MATCH(DMI_PRODUCT_NAME, "R528/R728"),
 761                         DMI_MATCH(DMI_BOARD_NAME, "R528/R728"),
 762                 },
 763                 .callback = dmi_check_cb,
 764         },
 765         {
 766                 .ident = "NC210/NC110",
 767                 .matches = {
 768                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 769                         DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
 770                         DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
 771                 },
 772                 .callback = dmi_check_cb,
 773         },
 774                 {
 775                 .ident = "X520",
 776                 .matches = {
 777                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 778                         DMI_MATCH(DMI_PRODUCT_NAME, "X520"),
 779                         DMI_MATCH(DMI_BOARD_NAME, "X520"),
 780                 },
 781                 .callback = dmi_check_cb,
 782         },
 783         { },
 784 };
 785 MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
 786
 787 static int find_signature(void __iomem *memcheck, const char *testStr)
 788 {
 789         int i = 0;
 790         int loca;
 791
 792         for (loca = 0; loca < 0xffff; loca++) {
 793                 char temp = readb(memcheck + loca);
 794
 795                 if (temp == testStr[i]) {
 796                         if (i == strlen(testStr)-1)
 797                                 break;
 798                         ++i;
 799                 } else {
 800                         i = 0;
 801                 }
 802         }
 803         return loca;
 804 }
 805
 806 static int __init samsung_init(void)
 807 {
 808         struct backlight_properties props;
 809         struct sabi_retval sretval;
 810         unsigned int ifaceP;
 811         int i;
 812         int loca;
 813         int retval;
 814
 815         mutex_init(&sabi_mutex);
 816
 817         if (!force && !dmi_check_system(samsung_dmi_table))
 818                 return -ENODEV;
 819
 820         f0000_segment = ioremap_nocache(0xf0000, 0xffff);
 821         if (!f0000_segment) {
 822                 pr_err("Can't map the segment at 0xf0000\n");
 823                 return -EINVAL;
 824         }
 825
 826         /* Try to find one of the signatures in memory to find the header */
 827         for (i = 0; sabi_configs[i].test_string != 0; ++i) {
 828                 sabi_config = &sabi_configs[i];
 829                 loca = find_signature(f0000_segment, sabi_config->test_string);
 830                 if (loca != 0xffff)
 831                         break;
 832         }
 833
 834         if (loca == 0xffff) {
 835                 pr_err("This computer does not support SABI\n");
 836                 goto error_no_signature;
 837         }
 838
 839         /* point to the SMI port Number */
 840         loca += 1;
 841         sabi = (f0000_segment + loca);
 842
 843         if (debug) {
 844                 printk(KERN_DEBUG "This computer supports SABI==%x\n",
 845                         loca + 0xf0000 - 6);
 846                 printk(KERN_DEBUG "SABI header:\n");
 847                 printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",
 848                         readw(sabi + sabi_config->header_offsets.port));
 849                 printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
 850                         readb(sabi + sabi_config->header_offsets.iface_func));
 851                 printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
 852                         readb(sabi + sabi_config->header_offsets.en_mem));
 853                 printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
 854                         readb(sabi + sabi_config->header_offsets.re_mem));
 855                 printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
 856                         readw(sabi + sabi_config->header_offsets.data_offset));
 857                 printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
 858                         readw(sabi + sabi_config->header_offsets.data_segment));
 859         }
 860
 861         /* Get a pointer to the SABI Interface */
 862         ifaceP = (readw(sabi + sabi_config->header_offsets.data_segment) & 0x0ffff) << 4;
 863         ifaceP += readw(sabi + sabi_config->header_offsets.data_offset) & 0x0ffff;
 864         sabi_iface = ioremap_nocache(ifaceP, 16);
 865         if (!sabi_iface) {
 866                 pr_err("Can't remap %x\n", ifaceP);
 867                 goto error_no_signature;
 868         }
 869         if (debug) {
 870                 printk(KERN_DEBUG "ifaceP = 0x%08x\n", ifaceP);
 871                 printk(KERN_DEBUG "sabi_iface = %p\n", sabi_iface);
 872
 873                 test_backlight();
 874                 test_wireless();
 875
 876                 retval = sabi_get_command(sabi_config->commands.get_brightness,
 877                                           &sretval);
 878                 printk(KERN_DEBUG "brightness = 0x%02x\n", sretval.retval[0]);
 879         }
 880
 881         /* Turn on "Linux" mode in the BIOS */
 882         if (sabi_config->commands.set_linux != 0xff) {
 883                 retval = sabi_set_command(sabi_config->commands.set_linux,
 884                                           0x81);
 885                 if (retval) {
 886                         pr_warn("Linux mode was not set!\n");
 887                         goto error_no_platform;
 888                 }
 889         }
 890
 891         /* Check for stepping quirk */
 892         check_for_stepping_quirk();
 893
 894         /* knock up a platform device to hang stuff off of */
 895         sdev = platform_device_register_simple("samsung", -1, NULL, 0);
 896         if (IS_ERR(sdev))
 897                 goto error_no_platform;
 898
 899         /* create a backlight device to talk to this one */
 900         memset(&props, 0, sizeof(struct backlight_properties));
 901         props.type = BACKLIGHT_PLATFORM;
 902         props.max_brightness = sabi_config->max_brightness -
 903                                 sabi_config->min_brightness;
 904         backlight_device = backlight_device_register("samsung", &sdev->dev,
 905                                                      NULL, &backlight_ops,
 906                                                      &props);
 907         if (IS_ERR(backlight_device))
 908                 goto error_no_backlight;
 909
 910         backlight_device->props.brightness = read_brightness();
 911         backlight_device->props.power = FB_BLANK_UNBLANK;
 912         backlight_update_status(backlight_device);
 913
 914         retval = init_wireless(sdev);
 915         if (retval)
 916                 goto error_no_rfk;
 917
 918         retval = device_create_file(&sdev->dev, &dev_attr_performance_level);
 919         if (retval)
 920                 goto error_file_create;
 921
 922         return 0;
 923
 924 error_file_create:
 925         destroy_wireless();
 926
 927 error_no_rfk:
 928         backlight_device_unregister(backlight_device);
 929
 930 error_no_backlight:
 931         platform_device_unregister(sdev);
 932
 933 error_no_platform:
 934         iounmap(sabi_iface);
 935
 936 error_no_signature:
 937         iounmap(f0000_segment);
 938         return -EINVAL;
 939 }
 940
 941 static void __exit samsung_exit(void)
 942 {
 943         /* Turn off "Linux" mode in the BIOS */
 944         if (sabi_config->commands.set_linux != 0xff)
 945                 sabi_set_command(sabi_config->commands.set_linux, 0x80);
 946
 947         device_remove_file(&sdev->dev, &dev_attr_performance_level);
 948         backlight_device_unregister(backlight_device);
 949         destroy_wireless();
 950         iounmap(sabi_iface);
 951         iounmap(f0000_segment);
 952         platform_device_unregister(sdev);
 953 }
 954
 955 module_init(samsung_init);
 956 module_exit(samsung_exit);
 957
 958 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
 959 MODULE_DESCRIPTION("Samsung Backlight driver");
 960 MODULE_LICENSE("GPL");