drivers/platform/x86/samsung-laptop.c

   1 /*
   2  * Samsung Laptop driver
   3  *
   4  * Copyright (C) 2009,2011 Greg Kroah-Hartman (gregkh@suse.de)
   5  * Copyright (C) 2009,2011 Novell Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  *
  11  */
  12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  13
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/delay.h>
  18 #include <linux/pci.h>
  19 #include <linux/backlight.h>
  20 #include <linux/leds.h>
  21 #include <linux/fb.h>
  22 #include <linux/dmi.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/rfkill.h>
  25 #include <linux/acpi.h>
  26 #include <linux/seq_file.h>
  27 #include <linux/debugfs.h>
  28
  29 /*
  30  * This driver is needed because a number of Samsung laptops do not hook
  31  * their control settings through ACPI.  So we have to poke around in the
  32  * BIOS to do things like brightness values, and "special" key controls.
  33  */
  34
  35 /*
  36  * We have 0 - 8 as valid brightness levels.  The specs say that level 0 should
  37  * be reserved by the BIOS (which really doesn't make much sense), we tell
  38  * userspace that the value is 0 - 7 and then just tell the hardware 1 - 8
  39  */
  40 #define MAX_BRIGHT      0x07
  41
  42
  43 #define SABI_IFACE_MAIN                 0x00
  44 #define SABI_IFACE_SUB                  0x02
  45 #define SABI_IFACE_COMPLETE             0x04
  46 #define SABI_IFACE_DATA                 0x05
  47
  48 #define WL_STATUS_WLAN                  0x0
  49 #define WL_STATUS_BT                    0x2
  50
  51 /* Structure get/set data using sabi */
  52 struct sabi_data {
  53         union {
  54                 struct {
  55                         u32 d0;
  56                         u32 d1;
  57                         u16 d2;
  58                         u8  d3;
  59                 };
  60                 u8 data[11];
  61         };
  62 };
  63
  64 struct sabi_header_offsets {
  65         u8 port;
  66         u8 re_mem;
  67         u8 iface_func;
  68         u8 en_mem;
  69         u8 data_offset;
  70         u8 data_segment;
  71 };
  72
  73 struct sabi_commands {
  74         /*
  75          * Brightness is 0 - 8, as described above.
  76          * Value 0 is for the BIOS to use
  77          */
  78         u16 get_brightness;
  79         u16 set_brightness;
  80
  81         /*
  82          * first byte:
  83          * 0x00 - wireless is off
  84          * 0x01 - wireless is on
  85          * second byte:
  86          * 0x02 - 3G is off
  87          * 0x03 - 3G is on
  88          * TODO, verify 3G is correct, that doesn't seem right...
  89          */
  90         u16 get_wireless_button;
  91         u16 set_wireless_button;
  92
  93         /* 0 is off, 1 is on */
  94         u16 get_backlight;
  95         u16 set_backlight;
  96
  97         /*
  98          * 0x80 or 0x00 - no action
  99          * 0x81 - recovery key pressed
 100          */
 101         u16 get_recovery_mode;
 102         u16 set_recovery_mode;
 103
 104         /*
 105          * on seclinux: 0 is low, 1 is high,
 106          * on swsmi: 0 is normal, 1 is silent, 2 is turbo
 107          */
 108         u16 get_performance_level;
 109         u16 set_performance_level;
 110
 111         /* 0x80 is off, 0x81 is on */
 112         u16 get_battery_life_extender;
 113         u16 set_battery_life_extender;
 114
 115         /* 0x80 is off, 0x81 is on */
 116         u16 get_usb_charge;
 117         u16 set_usb_charge;
 118
 119         /* the first byte is for bluetooth and the third one is for wlan */
 120         u16 get_wireless_status;
 121         u16 set_wireless_status;
 122
 123         /* 0x81 to read, (0x82 | level << 8) to set, 0xaabb to enable */
 124         u16 kbd_backlight;
 125
 126         /*
 127          * Tell the BIOS that Linux is running on this machine.
 128          * 81 is on, 80 is off
 129          */
 130         u16 set_linux;
 131 };
 132
 133 struct sabi_performance_level {
 134         const char *name;
 135         u16 value;
 136 };
 137
 138 struct sabi_config {
 139         int sabi_version;
 140         const char *test_string;
 141         u16 main_function;
 142         const struct sabi_header_offsets header_offsets;
 143         const struct sabi_commands commands;
 144         const struct sabi_performance_level performance_levels[4];
 145         u8 min_brightness;
 146         u8 max_brightness;
 147 };
 148
 149 static const struct sabi_config sabi_configs[] = {
 150         {
 151                 /* I don't know if it is really 2, but it it is
 152                  * less than 3 anyway */
 153                 .sabi_version = 2,
 154
 155                 .test_string = "SECLINUX",
 156
 157                 .main_function = 0x4c49,
 158
 159                 .header_offsets = {
 160                         .port = 0x00,
 161                         .re_mem = 0x02,
 162                         .iface_func = 0x03,
 163                         .en_mem = 0x04,
 164                         .data_offset = 0x05,
 165                         .data_segment = 0x07,
 166                 },
 167
 168                 .commands = {
 169                         .get_brightness = 0x00,
 170                         .set_brightness = 0x01,
 171
 172                         .get_wireless_button = 0x02,
 173                         .set_wireless_button = 0x03,
 174
 175                         .get_backlight = 0x04,
 176                         .set_backlight = 0x05,
 177
 178                         .get_recovery_mode = 0x06,
 179                         .set_recovery_mode = 0x07,
 180
 181                         .get_performance_level = 0x08,
 182                         .set_performance_level = 0x09,
 183
 184                         .get_battery_life_extender = 0xFFFF,
 185                         .set_battery_life_extender = 0xFFFF,
 186
 187                         .get_usb_charge = 0xFFFF,
 188                         .set_usb_charge = 0xFFFF,
 189
 190                         .get_wireless_status = 0xFFFF,
 191                         .set_wireless_status = 0xFFFF,
 192
 193                         .kbd_backlight = 0xFFFF,
 194
 195                         .set_linux = 0x0a,
 196                 },
 197
 198                 .performance_levels = {
 199                         {
 200                                 .name = "silent",
 201                                 .value = 0,
 202                         },
 203                         {
 204                                 .name = "normal",
 205                                 .value = 1,
 206                         },
 207                         { },
 208                 },
 209                 .min_brightness = 1,
 210                 .max_brightness = 8,
 211         },
 212         {
 213                 .sabi_version = 3,
 214
 215                 .test_string = "SwSmi@",
 216
 217                 .main_function = 0x5843,
 218
 219                 .header_offsets = {
 220                         .port = 0x00,
 221                         .re_mem = 0x04,
 222                         .iface_func = 0x02,
 223                         .en_mem = 0x03,
 224                         .data_offset = 0x05,
 225                         .data_segment = 0x07,
 226                 },
 227
 228                 .commands = {
 229                         .get_brightness = 0x10,
 230                         .set_brightness = 0x11,
 231
 232                         .get_wireless_button = 0x12,
 233                         .set_wireless_button = 0x13,
 234
 235                         .get_backlight = 0x2d,
 236                         .set_backlight = 0x2e,
 237
 238                         .get_recovery_mode = 0xff,
 239                         .set_recovery_mode = 0xff,
 240
 241                         .get_performance_level = 0x31,
 242                         .set_performance_level = 0x32,
 243
 244                         .get_battery_life_extender = 0x65,
 245                         .set_battery_life_extender = 0x66,
 246
 247                         .get_usb_charge = 0x67,
 248                         .set_usb_charge = 0x68,
 249
 250                         .get_wireless_status = 0x69,
 251                         .set_wireless_status = 0x6a,
 252
 253                         .kbd_backlight = 0x78,
 254
 255                         .set_linux = 0xff,
 256                 },
 257
 258                 .performance_levels = {
 259                         {
 260                                 .name = "normal",
 261                                 .value = 0,
 262                         },
 263                         {
 264                                 .name = "silent",
 265                                 .value = 1,
 266                         },
 267                         {
 268                                 .name = "overclock",
 269                                 .value = 2,
 270                         },
 271                         { },
 272                 },
 273                 .min_brightness = 0,
 274                 .max_brightness = 8,
 275         },
 276         { },
 277 };
 278
 279 /*
 280  * samsung-laptop/    - debugfs root directory
 281  *   f0000_segment    - dump f0000 segment
 282  *   command          - current command
 283  *   data             - current data
 284  *   d0, d1, d2, d3   - data fields
 285  *   call             - call SABI using command and data
 286  *
 287  * This allow to call arbitrary sabi commands wihout
 288  * modifying the driver at all.
 289  * For example, setting the keyboard backlight brightness to 5
 290  *
 291  *  echo 0x78 > command
 292  *  echo 0x0582 > d0
 293  *  echo 0 > d1
 294  *  echo 0 > d2
 295  *  echo 0 > d3
 296  *  cat call
 297  */
 298
 299 struct samsung_laptop_debug {
 300         struct dentry *root;
 301         struct sabi_data data;
 302         u16 command;
 303
 304         struct debugfs_blob_wrapper f0000_wrapper;
 305         struct debugfs_blob_wrapper data_wrapper;
 306         struct debugfs_blob_wrapper sdiag_wrapper;
 307 };
 308
 309 struct samsung_laptop;
 310
 311 struct samsung_rfkill {
 312         struct samsung_laptop *samsung;
 313         struct rfkill *rfkill;
 314         enum rfkill_type type;
 315 };
 316
 317 struct samsung_laptop {
 318         const struct sabi_config *config;
 319
 320         void __iomem *sabi;
 321         void __iomem *sabi_iface;
 322         void __iomem *f0000_segment;
 323
 324         struct mutex sabi_mutex;
 325
 326         struct platform_device *platform_device;
 327         struct backlight_device *backlight_device;
 328
 329         struct samsung_rfkill wlan;
 330         struct samsung_rfkill bluetooth;
 331
 332         struct led_classdev kbd_led;
 333         int kbd_led_wk;
 334         struct workqueue_struct *led_workqueue;
 335         struct work_struct kbd_led_work;
 336
 337         struct samsung_laptop_debug debug;
 338
 339         bool handle_backlight;
 340         bool has_stepping_quirk;
 341
 342         char sdiag[64];
 343 };
 344
 345
 346
 347 static bool force;
 348 module_param(force, bool, 0);
 349 MODULE_PARM_DESC(force,
 350                 "Disable the DMI check and forces the driver to be loaded");
 351
 352 static bool debug;
 353 module_param(debug, bool, S_IRUGO | S_IWUSR);
 354 MODULE_PARM_DESC(debug, "Debug enabled or not");
 355
 356 static int sabi_command(struct samsung_laptop *samsung, u16 command,
 357                         struct sabi_data *in,
 358                         struct sabi_data *out)
 359 {
 360         const struct sabi_config *config = samsung->config;
 361         int ret = 0;
 362         u16 port = readw(samsung->sabi + config->header_offsets.port);
 363         u8 complete, iface_data;
 364
 365         mutex_lock(&samsung->sabi_mutex);
 366
 367         if (debug) {
 368                 if (in)
 369                         pr_info("SABI 0x%04x {0x%08x, 0x%08x, 0x%04x, 0x%02x}",
 370                                 command, in->d0, in->d1, in->d2, in->d3);
 371                 else
 372                         pr_info("SABI 0x%04x", command);
 373         }
 374
 375         /* enable memory to be able to write to it */
 376         outb(readb(samsung->sabi + config->header_offsets.en_mem), port);
 377
 378         /* write out the command */
 379         writew(config->main_function, samsung->sabi_iface + SABI_IFACE_MAIN);
 380         writew(command, samsung->sabi_iface + SABI_IFACE_SUB);
 381         writeb(0, samsung->sabi_iface + SABI_IFACE_COMPLETE);
 382         if (in) {
 383                 writel(in->d0, samsung->sabi_iface + SABI_IFACE_DATA);
 384                 writel(in->d1, samsung->sabi_iface + SABI_IFACE_DATA + 4);
 385                 writew(in->d2, samsung->sabi_iface + SABI_IFACE_DATA + 8);
 386                 writeb(in->d3, samsung->sabi_iface + SABI_IFACE_DATA + 10);
 387         }
 388         outb(readb(samsung->sabi + config->header_offsets.iface_func), port);
 389
 390         /* write protect memory to make it safe */
 391         outb(readb(samsung->sabi + config->header_offsets.re_mem), port);
 392
 393         /* see if the command actually succeeded */
 394         complete = readb(samsung->sabi_iface + SABI_IFACE_COMPLETE);
 395         iface_data = readb(samsung->sabi_iface + SABI_IFACE_DATA);
 396         if (complete != 0xaa || iface_data == 0xff) {
 397                 pr_warn("SABI command 0x%04x failed with"
 398                         " completion flag 0x%02x and interface data 0x%02x",
 399                         command, complete, iface_data);
 400                 ret = -EINVAL;
 401                 goto exit;
 402         }
 403
 404         if (out) {
 405                 out->d0 = readl(samsung->sabi_iface + SABI_IFACE_DATA);
 406                 out->d1 = readl(samsung->sabi_iface + SABI_IFACE_DATA + 4);
 407                 out->d2 = readw(samsung->sabi_iface + SABI_IFACE_DATA + 2);
 408                 out->d3 = readb(samsung->sabi_iface + SABI_IFACE_DATA + 1);
 409         }
 410
 411         if (debug && out) {
 412                 pr_info("SABI {0x%08x, 0x%08x, 0x%04x, 0x%02x}",
 413                         out->d0, out->d1, out->d2, out->d3);
 414         }
 415
 416 exit:
 417         mutex_unlock(&samsung->sabi_mutex);
 418         return ret;
 419 }
 420
 421 /* simple wrappers usable with most commands */
 422 static int sabi_set_commandb(struct samsung_laptop *samsung,
 423                              u16 command, u8 data)
 424 {
 425         struct sabi_data in = { .d0 = 0, .d1 = 0, .d2 = 0, .d3 = 0 };
 426
 427         in.data[0] = data;
 428         return sabi_command(samsung, command, &in, NULL);
 429 }
 430
 431 static int read_brightness(struct samsung_laptop *samsung)
 432 {
 433         const struct sabi_config *config = samsung->config;
 434         const struct sabi_commands *commands = &samsung->config->commands;
 435         struct sabi_data sretval;
 436         int user_brightness = 0;
 437         int retval;
 438
 439         retval = sabi_command(samsung, commands->get_brightness,
 440                               NULL, &sretval);
 441         if (retval)
 442                 return retval;
 443
 444         user_brightness = sretval.data[0];
 445         if (user_brightness > config->min_brightness)
 446                 user_brightness -= config->min_brightness;
 447         else
 448                 user_brightness = 0;
 449
 450         return user_brightness;
 451 }
 452
 453 static void set_brightness(struct samsung_laptop *samsung, u8 user_brightness)
 454 {
 455         const struct sabi_config *config = samsung->config;
 456         const struct sabi_commands *commands = &samsung->config->commands;
 457         u8 user_level = user_brightness + config->min_brightness;
 458
 459         if (samsung->has_stepping_quirk && user_level != 0) {
 460                 /*
 461                  * short circuit if the specified level is what's already set
 462                  * to prevent the screen from flickering needlessly
 463                  */
 464                 if (user_brightness == read_brightness(samsung))
 465                         return;
 466
 467                 sabi_set_commandb(samsung, commands->set_brightness, 0);
 468         }
 469
 470         sabi_set_commandb(samsung, commands->set_brightness, user_level);
 471 }
 472
 473 static int get_brightness(struct backlight_device *bd)
 474 {
 475         struct samsung_laptop *samsung = bl_get_data(bd);
 476
 477         return read_brightness(samsung);
 478 }
 479
 480 static void check_for_stepping_quirk(struct samsung_laptop *samsung)
 481 {
 482         int initial_level;
 483         int check_level;
 484         int orig_level = read_brightness(samsung);
 485
 486         /*
 487          * Some laptops exhibit the strange behaviour of stepping toward
 488          * (rather than setting) the brightness except when changing to/from
 489          * brightness level 0. This behaviour is checked for here and worked
 490          * around in set_brightness.
 491          */
 492
 493         if (orig_level == 0)
 494                 set_brightness(samsung, 1);
 495
 496         initial_level = read_brightness(samsung);
 497
 498         if (initial_level <= 2)
 499                 check_level = initial_level + 2;
 500         else
 501                 check_level = initial_level - 2;
 502
 503         samsung->has_stepping_quirk = false;
 504         set_brightness(samsung, check_level);
 505
 506         if (read_brightness(samsung) != check_level) {
 507                 samsung->has_stepping_quirk = true;
 508                 pr_info("enabled workaround for brightness stepping quirk\n");
 509         }
 510
 511         set_brightness(samsung, orig_level);
 512 }
 513
 514 static int update_status(struct backlight_device *bd)
 515 {
 516         struct samsung_laptop *samsung = bl_get_data(bd);
 517         const struct sabi_commands *commands = &samsung->config->commands;
 518
 519         set_brightness(samsung, bd->props.brightness);
 520
 521         if (bd->props.power == FB_BLANK_UNBLANK)
 522                 sabi_set_commandb(samsung, commands->set_backlight, 1);
 523         else
 524                 sabi_set_commandb(samsung, commands->set_backlight, 0);
 525
 526         return 0;
 527 }
 528
 529 static const struct backlight_ops backlight_ops = {
 530         .get_brightness = get_brightness,
 531         .update_status  = update_status,
 532 };
 533
 534 static int seclinux_rfkill_set(void *data, bool blocked)
 535 {
 536         struct samsung_laptop *samsung = data;
 537         const struct sabi_commands *commands = &samsung->config->commands;
 538
 539         return sabi_set_commandb(samsung, commands->set_wireless_button,
 540                                  !blocked);
 541 }
 542
 543 static struct rfkill_ops seclinux_rfkill_ops = {
 544         .set_block = seclinux_rfkill_set,
 545 };
 546
 547 static int swsmi_wireless_status(struct samsung_laptop *samsung,
 548                                  struct sabi_data *data)
 549 {
 550         const struct sabi_commands *commands = &samsung->config->commands;
 551
 552         return sabi_command(samsung, commands->get_wireless_status,
 553                             NULL, data);
 554 }
 555
 556 static int swsmi_rfkill_set(void *priv, bool blocked)
 557 {
 558         struct samsung_rfkill *srfkill = priv;
 559         struct samsung_laptop *samsung = srfkill->samsung;
 560         const struct sabi_commands *commands = &samsung->config->commands;
 561         struct sabi_data data;
 562         int ret, i;
 563
 564         ret = swsmi_wireless_status(samsung, &data);
 565         if (ret)
 566                 return ret;
 567
 568         /* Don't set the state for non-present devices */
 569         for (i = 0; i < 4; i++)
 570                 if (data.data[i] == 0x02)
 571                         data.data[1] = 0;
 572
 573         if (srfkill->type == RFKILL_TYPE_WLAN)
 574                 data.data[WL_STATUS_WLAN] = !blocked;
 575         else if (srfkill->type == RFKILL_TYPE_BLUETOOTH)
 576                 data.data[WL_STATUS_BT] = !blocked;
 577
 578         return sabi_command(samsung, commands->set_wireless_status,
 579                             &data, &data);
 580 }
 581
 582 static void swsmi_rfkill_query(struct rfkill *rfkill, void *priv)
 583 {
 584         struct samsung_rfkill *srfkill = priv;
 585         struct samsung_laptop *samsung = srfkill->samsung;
 586         struct sabi_data data;
 587         int ret;
 588
 589         ret = swsmi_wireless_status(samsung, &data);
 590         if (ret)
 591                 return ;
 592
 593         if (srfkill->type == RFKILL_TYPE_WLAN)
 594                 ret = data.data[WL_STATUS_WLAN];
 595         else if (srfkill->type == RFKILL_TYPE_BLUETOOTH)
 596                 ret = data.data[WL_STATUS_BT];
 597         else
 598                 return ;
 599
 600         rfkill_set_sw_state(rfkill, !ret);
 601 }
 602
 603 static struct rfkill_ops swsmi_rfkill_ops = {
 604         .set_block = swsmi_rfkill_set,
 605         .query = swsmi_rfkill_query,
 606 };
 607
 608 static ssize_t get_performance_level(struct device *dev,
 609                                      struct device_attribute *attr, char *buf)
 610 {
 611         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 612         const struct sabi_config *config = samsung->config;
 613         const struct sabi_commands *commands = &config->commands;
 614         struct sabi_data sretval;
 615         int retval;
 616         int i;
 617
 618         /* Read the state */
 619         retval = sabi_command(samsung, commands->get_performance_level,
 620                               NULL, &sretval);
 621         if (retval)
 622                 return retval;
 623
 624         /* The logic is backwards, yeah, lots of fun... */
 625         for (i = 0; config->performance_levels[i].name; ++i) {
 626                 if (sretval.data[0] == config->performance_levels[i].value)
 627                         return sprintf(buf, "%s\n", config->performance_levels[i].name);
 628         }
 629         return sprintf(buf, "%s\n", "unknown");
 630 }
 631
 632 static ssize_t set_performance_level(struct device *dev,
 633                                 struct device_attribute *attr, const char *buf,
 634                                 size_t count)
 635 {
 636         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 637         const struct sabi_config *config = samsung->config;
 638         const struct sabi_commands *commands = &config->commands;
 639         int i;
 640
 641         if (count < 1)
 642                 return count;
 643
 644         for (i = 0; config->performance_levels[i].name; ++i) {
 645                 const struct sabi_performance_level *level =
 646                         &config->performance_levels[i];
 647                 if (!strncasecmp(level->name, buf, strlen(level->name))) {
 648                         sabi_set_commandb(samsung,
 649                                           commands->set_performance_level,
 650                                           level->value);
 651                         break;
 652                 }
 653         }
 654
 655         if (!config->performance_levels[i].name)
 656                 return -EINVAL;
 657
 658         return count;
 659 }
 660
 661 static DEVICE_ATTR(performance_level, S_IWUSR | S_IRUGO,
 662                    get_performance_level, set_performance_level);
 663
 664 static int read_battery_life_extender(struct samsung_laptop *samsung)
 665 {
 666         const struct sabi_commands *commands = &samsung->config->commands;
 667         struct sabi_data data;
 668         int retval;
 669
 670         if (commands->get_battery_life_extender == 0xFFFF)
 671                 return -ENODEV;
 672
 673         memset(&data, 0, sizeof(data));
 674         data.data[0] = 0x80;
 675         retval = sabi_command(samsung, commands->get_battery_life_extender,
 676                               &data, &data);
 677
 678         if (retval)
 679                 return retval;
 680
 681         if (data.data[0] != 0 && data.data[0] != 1)
 682                 return -ENODEV;
 683
 684         return data.data[0];
 685 }
 686
 687 static int write_battery_life_extender(struct samsung_laptop *samsung,
 688                                        int enabled)
 689 {
 690         const struct sabi_commands *commands = &samsung->config->commands;
 691         struct sabi_data data;
 692
 693         memset(&data, 0, sizeof(data));
 694         data.data[0] = 0x80 | enabled;
 695         return sabi_command(samsung, commands->set_battery_life_extender,
 696                             &data, NULL);
 697 }
 698
 699 static ssize_t get_battery_life_extender(struct device *dev,
 700                                          struct device_attribute *attr,
 701                                          char *buf)
 702 {
 703         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 704         int ret;
 705
 706         ret = read_battery_life_extender(samsung);
 707         if (ret < 0)
 708                 return ret;
 709
 710         return sprintf(buf, "%d\n", ret);
 711 }
 712
 713 static ssize_t set_battery_life_extender(struct device *dev,
 714                                         struct device_attribute *attr,
 715                                         const char *buf, size_t count)
 716 {
 717         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 718         int ret, value;
 719
 720         if (!count || sscanf(buf, "%i", &value) != 1)
 721                 return -EINVAL;
 722
 723         ret = write_battery_life_extender(samsung, !!value);
 724         if (ret < 0)
 725                 return ret;
 726
 727         return count;
 728 }
 729
 730 static DEVICE_ATTR(battery_life_extender, S_IWUSR | S_IRUGO,
 731                    get_battery_life_extender, set_battery_life_extender);
 732
 733 static int read_usb_charge(struct samsung_laptop *samsung)
 734 {
 735         const struct sabi_commands *commands = &samsung->config->commands;
 736         struct sabi_data data;
 737         int retval;
 738
 739         if (commands->get_usb_charge == 0xFFFF)
 740                 return -ENODEV;
 741
 742         memset(&data, 0, sizeof(data));
 743         data.data[0] = 0x80;
 744         retval = sabi_command(samsung, commands->get_usb_charge,
 745                               &data, &data);
 746
 747         if (retval)
 748                 return retval;
 749
 750         if (data.data[0] != 0 && data.data[0] != 1)
 751                 return -ENODEV;
 752
 753         return data.data[0];
 754 }
 755
 756 static int write_usb_charge(struct samsung_laptop *samsung,
 757                             int enabled)
 758 {
 759         const struct sabi_commands *commands = &samsung->config->commands;
 760         struct sabi_data data;
 761
 762         memset(&data, 0, sizeof(data));
 763         data.data[0] = 0x80 | enabled;
 764         return sabi_command(samsung, commands->set_usb_charge,
 765                             &data, NULL);
 766 }
 767
 768 static ssize_t get_usb_charge(struct device *dev,
 769                               struct device_attribute *attr,
 770                               char *buf)
 771 {
 772         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 773         int ret;
 774
 775         ret = read_usb_charge(samsung);
 776         if (ret < 0)
 777                 return ret;
 778
 779         return sprintf(buf, "%d\n", ret);
 780 }
 781
 782 static ssize_t set_usb_charge(struct device *dev,
 783                               struct device_attribute *attr,
 784                               const char *buf, size_t count)
 785 {
 786         struct samsung_laptop *samsung = dev_get_drvdata(dev);
 787         int ret, value;
 788
 789         if (!count || sscanf(buf, "%i", &value) != 1)
 790                 return -EINVAL;
 791
 792         ret = write_usb_charge(samsung, !!value);
 793         if (ret < 0)
 794                 return ret;
 795
 796         return count;
 797 }
 798
 799 static DEVICE_ATTR(usb_charge, S_IWUSR | S_IRUGO,
 800                    get_usb_charge, set_usb_charge);
 801
 802 static struct attribute *platform_attributes[] = {
 803         &dev_attr_performance_level.attr,
 804         &dev_attr_battery_life_extender.attr,
 805         &dev_attr_usb_charge.attr,
 806         NULL
 807 };
 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 void samsung_rfkill_exit(struct samsung_laptop *samsung)
 829 {
 830         if (samsung->wlan.rfkill) {
 831                 rfkill_unregister(samsung->wlan.rfkill);
 832                 rfkill_destroy(samsung->wlan.rfkill);
 833                 samsung->wlan.rfkill = NULL;
 834         }
 835         if (samsung->bluetooth.rfkill) {
 836                 rfkill_unregister(samsung->bluetooth.rfkill);
 837                 rfkill_destroy(samsung->bluetooth.rfkill);
 838                 samsung->bluetooth.rfkill = NULL;
 839         }
 840 }
 841
 842 static int samsung_new_rfkill(struct samsung_laptop *samsung,
 843                               struct samsung_rfkill *arfkill,
 844                               const char *name, enum rfkill_type type,
 845                               const struct rfkill_ops *ops,
 846                               int blocked)
 847 {
 848         struct rfkill **rfkill = &arfkill->rfkill;
 849         int ret;
 850
 851         arfkill->type = type;
 852         arfkill->samsung = samsung;
 853
 854         *rfkill = rfkill_alloc(name, &samsung->platform_device->dev,
 855                                type, ops, arfkill);
 856
 857         if (!*rfkill)
 858                 return -EINVAL;
 859
 860         if (blocked != -1)
 861                 rfkill_init_sw_state(*rfkill, blocked);
 862
 863         ret = rfkill_register(*rfkill);
 864         if (ret) {
 865                 rfkill_destroy(*rfkill);
 866                 *rfkill = NULL;
 867                 return ret;
 868         }
 869         return 0;
 870 }
 871
 872 static int __init samsung_rfkill_init_seclinux(struct samsung_laptop *samsung)
 873 {
 874         return samsung_new_rfkill(samsung, &samsung->wlan, "samsung-wlan",
 875                                   RFKILL_TYPE_WLAN, &seclinux_rfkill_ops, -1);
 876 }
 877
 878 static int __init samsung_rfkill_init_swsmi(struct samsung_laptop *samsung)
 879 {
 880         struct sabi_data data;
 881         int ret;
 882
 883         ret = swsmi_wireless_status(samsung, &data);
 884         if (ret)
 885                 return ret;
 886
 887         /* 0x02 seems to mean that the device is no present/available */
 888
 889         if (data.data[WL_STATUS_WLAN] != 0x02)
 890                 ret = samsung_new_rfkill(samsung, &samsung->wlan,
 891                                          "samsung-wlan",
 892                                          RFKILL_TYPE_WLAN,
 893                                          &swsmi_rfkill_ops,
 894                                          !data.data[WL_STATUS_WLAN]);
 895         if (ret)
 896                 goto exit;
 897
 898         if (data.data[WL_STATUS_BT] != 0x02)
 899                 ret = samsung_new_rfkill(samsung, &samsung->bluetooth,
 900                                          "samsung-bluetooth",
 901                                          RFKILL_TYPE_BLUETOOTH,
 902                                          &swsmi_rfkill_ops,
 903                                          !data.data[WL_STATUS_BT]);
 904         if (ret)
 905                 goto exit;
 906
 907 exit:
 908         if (ret)
 909                 samsung_rfkill_exit(samsung);
 910
 911         return ret;
 912 }
 913
 914 static int __init samsung_rfkill_init(struct samsung_laptop *samsung)
 915 {
 916         if (samsung->config->sabi_version == 2)
 917                 return samsung_rfkill_init_seclinux(samsung);
 918         if (samsung->config->sabi_version == 3)
 919                 return samsung_rfkill_init_swsmi(samsung);
 920         return 0;
 921 }
 922
 923 static int kbd_backlight_enable(struct samsung_laptop *samsung)
 924 {
 925         const struct sabi_commands *commands = &samsung->config->commands;
 926         struct sabi_data data;
 927         int retval;
 928
 929         if (commands->kbd_backlight == 0xFFFF)
 930                 return -ENODEV;
 931
 932         memset(&data, 0, sizeof(data));
 933         data.d0 = 0xaabb;
 934         retval = sabi_command(samsung, commands->kbd_backlight,
 935                               &data, &data);
 936
 937         if (retval)
 938                 return retval;
 939
 940         if (data.d0 != 0xccdd)
 941                 return -ENODEV;
 942         return 0;
 943 }
 944
 945 static int kbd_backlight_read(struct samsung_laptop *samsung)
 946 {
 947         const struct sabi_commands *commands = &samsung->config->commands;
 948         struct sabi_data data;
 949         int retval;
 950
 951         memset(&data, 0, sizeof(data));
 952         data.data[0] = 0x81;
 953         retval = sabi_command(samsung, commands->kbd_backlight,
 954                               &data, &data);
 955
 956         if (retval)
 957                 return retval;
 958
 959         return data.data[0];
 960 }
 961
 962 static int kbd_backlight_write(struct samsung_laptop *samsung, int brightness)
 963 {
 964         const struct sabi_commands *commands = &samsung->config->commands;
 965         struct sabi_data data;
 966
 967         memset(&data, 0, sizeof(data));
 968         data.d0 = 0x82 | ((brightness & 0xFF) << 8);
 969         return sabi_command(samsung, commands->kbd_backlight,
 970                             &data, NULL);
 971 }
 972
 973 static void kbd_led_update(struct work_struct *work)
 974 {
 975         struct samsung_laptop *samsung;
 976
 977         samsung = container_of(work, struct samsung_laptop, kbd_led_work);
 978         kbd_backlight_write(samsung, samsung->kbd_led_wk);
 979 }
 980
 981 static void kbd_led_set(struct led_classdev *led_cdev,
 982                         enum led_brightness value)
 983 {
 984         struct samsung_laptop *samsung;
 985
 986         samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
 987
 988         if (value > samsung->kbd_led.max_brightness)
 989                 value = samsung->kbd_led.max_brightness;
 990         else if (value < 0)
 991                 value = 0;
 992
 993         samsung->kbd_led_wk = value;
 994         queue_work(samsung->led_workqueue, &samsung->kbd_led_work);
 995 }
 996
 997 static enum led_brightness kbd_led_get(struct led_classdev *led_cdev)
 998 {
 999         struct samsung_laptop *samsung;
1000
1001         samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
1002         return kbd_backlight_read(samsung);
1003 }
1004
1005 static void samsung_leds_exit(struct samsung_laptop *samsung)
1006 {
1007         if (!IS_ERR_OR_NULL(samsung->kbd_led.dev))
1008                 led_classdev_unregister(&samsung->kbd_led);
1009         if (samsung->led_workqueue)
1010                 destroy_workqueue(samsung->led_workqueue);
1011 }
1012
1013 static int __init samsung_leds_init(struct samsung_laptop *samsung)
1014 {
1015         int ret = 0;
1016
1017         samsung->led_workqueue = create_singlethread_workqueue("led_workqueue");
1018         if (!samsung->led_workqueue)
1019                 return -ENOMEM;
1020
1021         if (kbd_backlight_enable(samsung) >= 0) {
1022                 INIT_WORK(&samsung->kbd_led_work, kbd_led_update);
1023
1024                 samsung->kbd_led.name = "samsung::kbd_backlight";
1025                 samsung->kbd_led.brightness_set = kbd_led_set;
1026                 samsung->kbd_led.brightness_get = kbd_led_get;
1027                 samsung->kbd_led.max_brightness = 8;
1028
1029                 ret = led_classdev_register(&samsung->platform_device->dev,
1030                                            &samsung->kbd_led);
1031         }
1032
1033         if (ret)
1034                 samsung_leds_exit(samsung);
1035
1036         return ret;
1037 }
1038
1039 static void samsung_backlight_exit(struct samsung_laptop *samsung)
1040 {
1041         if (samsung->backlight_device) {
1042                 backlight_device_unregister(samsung->backlight_device);
1043                 samsung->backlight_device = NULL;
1044         }
1045 }
1046
1047 static int __init samsung_backlight_init(struct samsung_laptop *samsung)
1048 {
1049         struct backlight_device *bd;
1050         struct backlight_properties props;
1051
1052         if (!samsung->handle_backlight)
1053                 return 0;
1054
1055         memset(&props, 0, sizeof(struct backlight_properties));
1056         props.type = BACKLIGHT_PLATFORM;
1057         props.max_brightness = samsung->config->max_brightness -
1058                 samsung->config->min_brightness;
1059
1060         bd = backlight_device_register("samsung",
1061                                        &samsung->platform_device->dev,
1062                                        samsung, &backlight_ops,
1063                                        &props);
1064         if (IS_ERR(bd))
1065                 return PTR_ERR(bd);
1066
1067         samsung->backlight_device = bd;
1068         samsung->backlight_device->props.brightness = read_brightness(samsung);
1069         samsung->backlight_device->props.power = FB_BLANK_UNBLANK;
1070         backlight_update_status(samsung->backlight_device);
1071
1072         return 0;
1073 }
1074
1075 static mode_t samsung_sysfs_is_visible(struct kobject *kobj,
1076                                        struct attribute *attr, int idx)
1077 {
1078         struct device *dev = container_of(kobj, struct device, kobj);
1079         struct platform_device *pdev = to_platform_device(dev);
1080         struct samsung_laptop *samsung = platform_get_drvdata(pdev);
1081         bool ok = true;
1082
1083         if (attr == &dev_attr_performance_level.attr)
1084                 ok = !!samsung->config->performance_levels[0].name;
1085         if (attr == &dev_attr_battery_life_extender.attr)
1086                 ok = !!(read_battery_life_extender(samsung) >= 0);
1087         if (attr == &dev_attr_usb_charge.attr)
1088                 ok = !!(read_usb_charge(samsung) >= 0);
1089
1090         return ok ? attr->mode : 0;
1091 }
1092
1093 static struct attribute_group platform_attribute_group = {
1094         .is_visible = samsung_sysfs_is_visible,
1095         .attrs = platform_attributes
1096 };
1097
1098 static void samsung_sysfs_exit(struct samsung_laptop *samsung)
1099 {
1100         struct platform_device *device = samsung->platform_device;
1101
1102         sysfs_remove_group(&device->dev.kobj, &platform_attribute_group);
1103 }
1104
1105 static int __init samsung_sysfs_init(struct samsung_laptop *samsung)
1106 {
1107         struct platform_device *device = samsung->platform_device;
1108
1109         return sysfs_create_group(&device->dev.kobj, &platform_attribute_group);
1110
1111 }
1112
1113 static int show_call(struct seq_file *m, void *data)
1114 {
1115         struct samsung_laptop *samsung = m->private;
1116         struct sabi_data *sdata = &samsung->debug.data;
1117         int ret;
1118
1119         seq_printf(m, "SABI 0x%04x {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
1120                    samsung->debug.command,
1121                    sdata->d0, sdata->d1, sdata->d2, sdata->d3);
1122
1123         ret = sabi_command(samsung, samsung->debug.command, sdata, sdata);
1124
1125         if (ret) {
1126                 seq_printf(m, "SABI command 0x%04x failed\n",
1127                            samsung->debug.command);
1128                 return ret;
1129         }
1130
1131         seq_printf(m, "SABI {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
1132                    sdata->d0, sdata->d1, sdata->d2, sdata->d3);
1133         return 0;
1134 }
1135
1136 static int samsung_debugfs_open(struct inode *inode, struct file *file)
1137 {
1138         return single_open(file, show_call, inode->i_private);
1139 }
1140
1141 static const struct file_operations samsung_laptop_call_io_ops = {
1142         .owner = THIS_MODULE,
1143         .open = samsung_debugfs_open,
1144         .read = seq_read,
1145         .llseek = seq_lseek,
1146         .release = single_release,
1147 };
1148
1149 static void samsung_debugfs_exit(struct samsung_laptop *samsung)
1150 {
1151         debugfs_remove_recursive(samsung->debug.root);
1152 }
1153
1154 static int samsung_debugfs_init(struct samsung_laptop *samsung)
1155 {
1156         struct dentry *dent;
1157
1158         samsung->debug.root = debugfs_create_dir("samsung-laptop", NULL);
1159         if (!samsung->debug.root) {
1160                 pr_err("failed to create debugfs directory");
1161                 goto error_debugfs;
1162         }
1163
1164         samsung->debug.f0000_wrapper.data = samsung->f0000_segment;
1165         samsung->debug.f0000_wrapper.size = 0xffff;
1166
1167         samsung->debug.data_wrapper.data = &samsung->debug.data;
1168         samsung->debug.data_wrapper.size = sizeof(samsung->debug.data);
1169
1170         samsung->debug.sdiag_wrapper.data = samsung->sdiag;
1171         samsung->debug.sdiag_wrapper.size = strlen(samsung->sdiag);
1172
1173         dent = debugfs_create_u16("command", S_IRUGO | S_IWUSR,
1174                                   samsung->debug.root, &samsung->debug.command);
1175         if (!dent)
1176                 goto error_debugfs;
1177
1178         dent = debugfs_create_u32("d0", S_IRUGO | S_IWUSR, samsung->debug.root,
1179                                   &samsung->debug.data.d0);
1180         if (!dent)
1181                 goto error_debugfs;
1182
1183         dent = debugfs_create_u32("d1", S_IRUGO | S_IWUSR, samsung->debug.root,
1184                                   &samsung->debug.data.d1);
1185         if (!dent)
1186                 goto error_debugfs;
1187
1188         dent = debugfs_create_u16("d2", S_IRUGO | S_IWUSR, samsung->debug.root,
1189                                   &samsung->debug.data.d2);
1190         if (!dent)
1191                 goto error_debugfs;
1192
1193         dent = debugfs_create_u8("d3", S_IRUGO | S_IWUSR, samsung->debug.root,
1194                                  &samsung->debug.data.d3);
1195         if (!dent)
1196                 goto error_debugfs;
1197
1198         dent = debugfs_create_blob("data", S_IRUGO | S_IWUSR,
1199                                    samsung->debug.root,
1200                                    &samsung->debug.data_wrapper);
1201         if (!dent)
1202                 goto error_debugfs;
1203
1204         dent = debugfs_create_blob("f0000_segment", S_IRUSR | S_IWUSR,
1205                                    samsung->debug.root,
1206                                    &samsung->debug.f0000_wrapper);
1207         if (!dent)
1208                 goto error_debugfs;
1209
1210         dent = debugfs_create_file("call", S_IFREG | S_IRUGO,
1211                                    samsung->debug.root, samsung,
1212                                    &samsung_laptop_call_io_ops);
1213         if (!dent)
1214                 goto error_debugfs;
1215
1216         dent = debugfs_create_blob("sdiag", S_IRUGO | S_IWUSR,
1217                                    samsung->debug.root,
1218                                    &samsung->debug.sdiag_wrapper);
1219         if (!dent)
1220                 goto error_debugfs;
1221
1222         return 0;
1223
1224 error_debugfs:
1225         samsung_debugfs_exit(samsung);
1226         return -ENOMEM;
1227 }
1228
1229 static void samsung_sabi_exit(struct samsung_laptop *samsung)
1230 {
1231         const struct sabi_config *config = samsung->config;
1232
1233         /* Turn off "Linux" mode in the BIOS */
1234         if (config && config->commands.set_linux != 0xff)
1235                 sabi_set_commandb(samsung, config->commands.set_linux, 0x80);
1236
1237         if (samsung->sabi_iface) {
1238                 iounmap(samsung->sabi_iface);
1239                 samsung->sabi_iface = NULL;
1240         }
1241         if (samsung->f0000_segment) {
1242                 iounmap(samsung->f0000_segment);
1243                 samsung->f0000_segment = NULL;
1244         }
1245
1246         samsung->config = NULL;
1247 }
1248
1249 static __init void samsung_sabi_infos(struct samsung_laptop *samsung, int loca,
1250                                       unsigned int ifaceP)
1251 {
1252         const struct sabi_config *config = samsung->config;
1253
1254         printk(KERN_DEBUG "This computer supports SABI==%x\n",
1255                loca + 0xf0000 - 6);
1256
1257         printk(KERN_DEBUG "SABI header:\n");
1258         printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",
1259                readw(samsung->sabi + config->header_offsets.port));
1260         printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
1261                readb(samsung->sabi + config->header_offsets.iface_func));
1262         printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
1263                readb(samsung->sabi + config->header_offsets.en_mem));
1264         printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
1265                readb(samsung->sabi + config->header_offsets.re_mem));
1266         printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
1267                readw(samsung->sabi + config->header_offsets.data_offset));
1268         printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
1269                readw(samsung->sabi + config->header_offsets.data_segment));
1270
1271         printk(KERN_DEBUG " SABI pointer = 0x%08x\n", ifaceP);
1272 }
1273
1274 static void __init samsung_sabi_diag(struct samsung_laptop *samsung)
1275 {
1276         int loca = find_signature(samsung->f0000_segment, "SDiaG@");
1277         int i;
1278
1279         if (loca == 0xffff)
1280                 return ;
1281
1282         /* Example:
1283          * Ident: @SDiaG@686XX-N90X3A/966-SEC-07HL-S90X3A
1284          *
1285          * Product name: 90X3A
1286          * BIOS Version: 07HL
1287          */
1288         loca += 1;
1289         for (i = 0; loca < 0xffff && i < sizeof(samsung->sdiag) - 1; loca++) {
1290                 char temp = readb(samsung->f0000_segment + loca);
1291
1292                 if (isalnum(temp) || temp == '/' || temp == '-')
1293                         samsung->sdiag[i++] = temp;
1294                 else
1295                         break ;
1296         }
1297
1298         if (debug && samsung->sdiag[0])
1299                 pr_info("sdiag: %s", samsung->sdiag);
1300 }
1301
1302 static int __init samsung_sabi_init(struct samsung_laptop *samsung)
1303 {
1304         const struct sabi_config *config = NULL;
1305         const struct sabi_commands *commands;
1306         unsigned int ifaceP;
1307         int ret = 0;
1308         int i;
1309         int loca;
1310
1311         samsung->f0000_segment = ioremap_nocache(0xf0000, 0xffff);
1312         if (!samsung->f0000_segment) {
1313                 if (debug || force)
1314                         pr_err("Can't map the segment at 0xf0000\n");
1315                 ret = -EINVAL;
1316                 goto exit;
1317         }
1318
1319         samsung_sabi_diag(samsung);
1320
1321         /* Try to find one of the signatures in memory to find the header */
1322         for (i = 0; sabi_configs[i].test_string != 0; ++i) {
1323                 samsung->config = &sabi_configs[i];
1324                 loca = find_signature(samsung->f0000_segment,
1325                                       samsung->config->test_string);
1326                 if (loca != 0xffff)
1327                         break;
1328         }
1329
1330         if (loca == 0xffff) {
1331                 if (debug || force)
1332                         pr_err("This computer does not support SABI\n");
1333                 ret = -ENODEV;
1334                 goto exit;
1335         }
1336
1337         config = samsung->config;
1338         commands = &config->commands;
1339
1340         /* point to the SMI port Number */
1341         loca += 1;
1342         samsung->sabi = (samsung->f0000_segment + loca);
1343
1344         /* Get a pointer to the SABI Interface */
1345         ifaceP = (readw(samsung->sabi + config->header_offsets.data_segment) & 0x0ffff) << 4;
1346         ifaceP += readw(samsung->sabi + config->header_offsets.data_offset) & 0x0ffff;
1347
1348         if (debug)
1349                 samsung_sabi_infos(samsung, loca, ifaceP);
1350
1351         samsung->sabi_iface = ioremap_nocache(ifaceP, 16);
1352         if (!samsung->sabi_iface) {
1353                 pr_err("Can't remap %x\n", ifaceP);
1354                 ret = -EINVAL;
1355                 goto exit;
1356         }
1357
1358         /* Turn on "Linux" mode in the BIOS */
1359         if (commands->set_linux != 0xff) {
1360                 int retval = sabi_set_commandb(samsung,
1361                                                commands->set_linux, 0x81);
1362                 if (retval) {
1363                         pr_warn("Linux mode was not set!\n");
1364                         ret = -ENODEV;
1365                         goto exit;
1366                 }
1367         }
1368
1369         /* Check for stepping quirk */
1370         if (samsung->handle_backlight)
1371                 check_for_stepping_quirk(samsung);
1372
1373 exit:
1374         if (ret)
1375                 samsung_sabi_exit(samsung);
1376
1377         return ret;
1378 }
1379
1380 static void samsung_platform_exit(struct samsung_laptop *samsung)
1381 {
1382         if (samsung->platform_device) {
1383                 platform_device_unregister(samsung->platform_device);
1384                 samsung->platform_device = NULL;
1385         }
1386 }
1387
1388 static int __init samsung_platform_init(struct samsung_laptop *samsung)
1389 {
1390         struct platform_device *pdev;
1391
1392         pdev = platform_device_register_simple("samsung", -1, NULL, 0);
1393         if (IS_ERR(pdev))
1394                 return PTR_ERR(pdev);
1395
1396         samsung->platform_device = pdev;
1397         platform_set_drvdata(samsung->platform_device, samsung);
1398         return 0;
1399 }
1400
1401 static struct dmi_system_id __initdata samsung_dmi_table[] = {
1402         {
1403                 .matches = {
1404                         DMI_MATCH(DMI_SYS_VENDOR,
1405                                         "SAMSUNG ELECTRONICS CO., LTD."),
1406                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"), /* Portable */
1407                 },
1408         },
1409         {
1410                 .matches = {
1411                         DMI_MATCH(DMI_SYS_VENDOR,
1412                                         "SAMSUNG ELECTRONICS CO., LTD."),
1413                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /* Laptop */
1414                 },
1415         },
1416         {
1417                 .matches = {
1418                         DMI_MATCH(DMI_SYS_VENDOR,
1419                                         "SAMSUNG ELECTRONICS CO., LTD."),
1420                         DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /* Notebook */
1421                 },
1422         },
1423         {
1424                 .matches = {
1425                         DMI_MATCH(DMI_SYS_VENDOR,
1426                                         "SAMSUNG ELECTRONICS CO., LTD."),
1427                         DMI_MATCH(DMI_CHASSIS_TYPE, "14"), /* Sub-Notebook */
1428                 },
1429         },
1430         { },
1431 };
1432 MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
1433
1434 static struct platform_device *samsung_platform_device;
1435
1436 static int __init samsung_init(void)
1437 {
1438         struct samsung_laptop *samsung;
1439         int ret;
1440
1441         if (!force && !dmi_check_system(samsung_dmi_table))
1442                 return -ENODEV;
1443
1444         samsung = kzalloc(sizeof(*samsung), GFP_KERNEL);
1445         if (!samsung)
1446                 return -ENOMEM;
1447
1448         mutex_init(&samsung->sabi_mutex);
1449         samsung->handle_backlight = true;
1450
1451 #ifdef CONFIG_ACPI
1452         /* Don't handle backlight here if the acpi video already handle it */
1453         if (acpi_video_backlight_support())
1454                 samsung->handle_backlight = false;
1455 #endif
1456         ret = samsung_platform_init(samsung);
1457         if (ret)
1458                 goto error_platform;
1459
1460         ret = samsung_sabi_init(samsung);
1461         if (ret)
1462                 goto error_sabi;
1463
1464 #ifdef CONFIG_ACPI
1465         /* Only log that if we are really on a sabi platform */
1466         if (acpi_video_backlight_support())
1467                 pr_info("Backlight controlled by ACPI video driver\n");
1468 #endif
1469
1470         ret = samsung_sysfs_init(samsung);
1471         if (ret)
1472                 goto error_sysfs;
1473
1474         ret = samsung_backlight_init(samsung);
1475         if (ret)
1476                 goto error_backlight;
1477
1478         ret = samsung_rfkill_init(samsung);
1479         if (ret)
1480                 goto error_rfkill;
1481
1482         ret = samsung_leds_init(samsung);
1483         if (ret)
1484                 goto error_leds;
1485
1486         ret = samsung_debugfs_init(samsung);
1487         if (ret)
1488                 goto error_debugfs;
1489
1490         samsung_platform_device = samsung->platform_device;
1491         return ret;
1492
1493 error_debugfs:
1494         samsung_leds_exit(samsung);
1495 error_leds:
1496         samsung_rfkill_exit(samsung);
1497 error_rfkill:
1498         samsung_backlight_exit(samsung);
1499 error_backlight:
1500         samsung_sysfs_exit(samsung);
1501 error_sysfs:
1502         samsung_sabi_exit(samsung);
1503 error_sabi:
1504         samsung_platform_exit(samsung);
1505 error_platform:
1506         kfree(samsung);
1507         return ret;
1508 }
1509
1510 static void __exit samsung_exit(void)
1511 {
1512         struct samsung_laptop *samsung;
1513
1514         samsung = platform_get_drvdata(samsung_platform_device);
1515
1516         samsung_debugfs_exit(samsung);
1517         samsung_leds_exit(samsung);
1518         samsung_rfkill_exit(samsung);
1519         samsung_backlight_exit(samsung);
1520         samsung_sysfs_exit(samsung);
1521         samsung_sabi_exit(samsung);
1522         samsung_platform_exit(samsung);
1523
1524         kfree(samsung);
1525         samsung_platform_device = NULL;
1526 }
1527
1528 module_init(samsung_init);
1529 module_exit(samsung_exit);
1530
1531 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
1532 MODULE_DESCRIPTION("Samsung Backlight driver");
1533 MODULE_LICENSE("GPL");