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