linux/drivers/platform/x86/samsung-laptop.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Samsung Laptop driver
   4 *
   5 * Copyright (C) 2009,2011 Greg Kroah-Hartman (gregkh@suse.de)
   6 * Copyright (C) 2009,2011 Novell Inc.
   7 */
   8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10#include <linux/kernel.h>
  11#include <linux/init.h>
  12#include <linux/module.h>
  13#include <linux/delay.h>
  14#include <linux/pci.h>
  15#include <linux/backlight.h>
  16#include <linux/leds.h>
  17#include <linux/fb.h>
  18#include <linux/dmi.h>
  19#include <linux/platform_device.h>
  20#include <linux/rfkill.h>
  21#include <linux/acpi.h>
  22#include <linux/seq_file.h>
  23#include <linux/debugfs.h>
  24#include <linux/ctype.h>
  25#include <linux/efi.h>
  26#include <linux/suspend.h>
  27#include <acpi/video.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 */
  52struct 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
  64struct 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
  73struct 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        /* 0x80 is off, 0x81 is on */
 124        u16 get_lid_handling;
 125        u16 set_lid_handling;
 126
 127        /* 0x81 to read, (0x82 | level << 8) to set, 0xaabb to enable */
 128        u16 kbd_backlight;
 129
 130        /*
 131         * Tell the BIOS that Linux is running on this machine.
 132         * 81 is on, 80 is off
 133         */
 134        u16 set_linux;
 135};
 136
 137struct sabi_performance_level {
 138        const char *name;
 139        u16 value;
 140};
 141
 142struct sabi_config {
 143        int sabi_version;
 144        const char *test_string;
 145        u16 main_function;
 146        const struct sabi_header_offsets header_offsets;
 147        const struct sabi_commands commands;
 148        const struct sabi_performance_level performance_levels[4];
 149        u8 min_brightness;
 150        u8 max_brightness;
 151};
 152
 153static const struct sabi_config sabi_configs[] = {
 154        {
 155                /* I don't know if it is really 2, but it it is
 156                 * less than 3 anyway */
 157                .sabi_version = 2,
 158
 159                .test_string = "SECLINUX",
 160
 161                .main_function = 0x4c49,
 162
 163                .header_offsets = {
 164                        .port = 0x00,
 165                        .re_mem = 0x02,
 166                        .iface_func = 0x03,
 167                        .en_mem = 0x04,
 168                        .data_offset = 0x05,
 169                        .data_segment = 0x07,
 170                },
 171
 172                .commands = {
 173                        .get_brightness = 0x00,
 174                        .set_brightness = 0x01,
 175
 176                        .get_wireless_button = 0x02,
 177                        .set_wireless_button = 0x03,
 178
 179                        .get_backlight = 0x04,
 180                        .set_backlight = 0x05,
 181
 182                        .get_recovery_mode = 0x06,
 183                        .set_recovery_mode = 0x07,
 184
 185                        .get_performance_level = 0x08,
 186                        .set_performance_level = 0x09,
 187
 188                        .get_battery_life_extender = 0xFFFF,
 189                        .set_battery_life_extender = 0xFFFF,
 190
 191                        .get_usb_charge = 0xFFFF,
 192                        .set_usb_charge = 0xFFFF,
 193
 194                        .get_wireless_status = 0xFFFF,
 195                        .set_wireless_status = 0xFFFF,
 196
 197                        .get_lid_handling = 0xFFFF,
 198                        .set_lid_handling = 0xFFFF,
 199
 200                        .kbd_backlight = 0xFFFF,
 201
 202                        .set_linux = 0x0a,
 203                },
 204
 205                .performance_levels = {
 206                        {
 207                                .name = "silent",
 208                                .value = 0,
 209                        },
 210                        {
 211                                .name = "normal",
 212                                .value = 1,
 213                        },
 214                        { },
 215                },
 216                .min_brightness = 1,
 217                .max_brightness = 8,
 218        },
 219        {
 220                .sabi_version = 3,
 221
 222                .test_string = "SwSmi@",
 223
 224                .main_function = 0x5843,
 225
 226                .header_offsets = {
 227                        .port = 0x00,
 228                        .re_mem = 0x04,
 229                        .iface_func = 0x02,
 230                        .en_mem = 0x03,
 231                        .data_offset = 0x05,
 232                        .data_segment = 0x07,
 233                },
 234
 235                .commands = {
 236                        .get_brightness = 0x10,
 237                        .set_brightness = 0x11,
 238
 239                        .get_wireless_button = 0x12,
 240                        .set_wireless_button = 0x13,
 241
 242                        .get_backlight = 0x2d,
 243                        .set_backlight = 0x2e,
 244
 245                        .get_recovery_mode = 0xff,
 246                        .set_recovery_mode = 0xff,
 247
 248                        .get_performance_level = 0x31,
 249                        .set_performance_level = 0x32,
 250
 251                        .get_battery_life_extender = 0x65,
 252                        .set_battery_life_extender = 0x66,
 253
 254                        .get_usb_charge = 0x67,
 255                        .set_usb_charge = 0x68,
 256
 257                        .get_wireless_status = 0x69,
 258                        .set_wireless_status = 0x6a,
 259
 260                        .get_lid_handling = 0x6d,
 261                        .set_lid_handling = 0x6e,
 262
 263                        .kbd_backlight = 0x78,
 264
 265                        .set_linux = 0xff,
 266                },
 267
 268                .performance_levels = {
 269                        {
 270                                .name = "normal",
 271                                .value = 0,
 272                        },
 273                        {
 274                                .name = "silent",
 275                                .value = 1,
 276                        },
 277                        {
 278                                .name = "overclock",
 279                                .value = 2,
 280                        },
 281                        { },
 282                },
 283                .min_brightness = 0,
 284                .max_brightness = 8,
 285        },
 286        { },
 287};
 288
 289/*
 290 * samsung-laptop/    - debugfs root directory
 291 *   f0000_segment    - dump f0000 segment
 292 *   command          - current command
 293 *   data             - current data
 294 *   d0, d1, d2, d3   - data fields
 295 *   call             - call SABI using command and data
 296 *
 297 * This allow to call arbitrary sabi commands wihout
 298 * modifying the driver at all.
 299 * For example, setting the keyboard backlight brightness to 5
 300 *
 301 *  echo 0x78 > command
 302 *  echo 0x0582 > d0
 303 *  echo 0 > d1
 304 *  echo 0 > d2
 305 *  echo 0 > d3
 306 *  cat call
 307 */
 308
 309struct samsung_laptop_debug {
 310        struct dentry *root;
 311        struct sabi_data data;
 312        u16 command;
 313
 314        struct debugfs_blob_wrapper f0000_wrapper;
 315        struct debugfs_blob_wrapper data_wrapper;
 316        struct debugfs_blob_wrapper sdiag_wrapper;
 317};
 318
 319struct samsung_laptop;
 320
 321struct samsung_rfkill {
 322        struct samsung_laptop *samsung;
 323        struct rfkill *rfkill;
 324        enum rfkill_type type;
 325};
 326
 327struct samsung_laptop {
 328        const struct sabi_config *config;
 329
 330        void __iomem *sabi;
 331        void __iomem *sabi_iface;
 332        void __iomem *f0000_segment;
 333
 334        struct mutex sabi_mutex;
 335
 336        struct platform_device *platform_device;
 337        struct backlight_device *backlight_device;
 338
 339        struct samsung_rfkill wlan;
 340        struct samsung_rfkill bluetooth;
 341
 342        struct led_classdev kbd_led;
 343        int kbd_led_wk;
 344        struct workqueue_struct *led_workqueue;
 345        struct work_struct kbd_led_work;
 346
 347        struct samsung_laptop_debug debug;
 348        struct samsung_quirks *quirks;
 349
 350        struct notifier_block pm_nb;
 351
 352        bool handle_backlight;
 353        bool has_stepping_quirk;
 354
 355        char sdiag[64];
 356};
 357
 358struct samsung_quirks {
 359        bool broken_acpi_video;
 360        bool four_kbd_backlight_levels;
 361        bool enable_kbd_backlight;
 362        bool use_native_backlight;
 363        bool lid_handling;
 364};
 365
 366static struct samsung_quirks samsung_unknown = {};
 367
 368static struct samsung_quirks samsung_broken_acpi_video = {
 369        .broken_acpi_video = true,
 370};
 371
 372static struct samsung_quirks samsung_use_native_backlight = {
 373        .use_native_backlight = true,
 374};
 375
 376static struct samsung_quirks samsung_np740u3e = {
 377        .four_kbd_backlight_levels = true,
 378        .enable_kbd_backlight = true,
 379};
 380
 381static struct samsung_quirks samsung_lid_handling = {
 382        .lid_handling = true,
 383};
 384
 385static bool force;
 386module_param(force, bool, 0);
 387MODULE_PARM_DESC(force,
 388                "Disable the DMI check and forces the driver to be loaded");
 389
 390static bool debug;
 391module_param(debug, bool, S_IRUGO | S_IWUSR);
 392MODULE_PARM_DESC(debug, "Debug enabled or not");
 393
 394static int sabi_command(struct samsung_laptop *samsung, u16 command,
 395                        struct sabi_data *in,
 396                        struct sabi_data *out)
 397{
 398        const struct sabi_config *config = samsung->config;
 399        int ret = 0;
 400        u16 port = readw(samsung->sabi + config->header_offsets.port);
 401        u8 complete, iface_data;
 402
 403        mutex_lock(&samsung->sabi_mutex);
 404
 405        if (debug) {
 406                if (in)
 407                        pr_info("SABI command:0x%04x "
 408                                "data:{0x%08x, 0x%08x, 0x%04x, 0x%02x}",
 409                                command, in->d0, in->d1, in->d2, in->d3);
 410                else
 411                        pr_info("SABI command:0x%04x", command);
 412        }
 413
 414        /* enable memory to be able to write to it */
 415        outb(readb(samsung->sabi + config->header_offsets.en_mem), port);
 416
 417        /* write out the command */
 418        writew(config->main_function, samsung->sabi_iface + SABI_IFACE_MAIN);
 419        writew(command, samsung->sabi_iface + SABI_IFACE_SUB);
 420        writeb(0, samsung->sabi_iface + SABI_IFACE_COMPLETE);
 421        if (in) {
 422                writel(in->d0, samsung->sabi_iface + SABI_IFACE_DATA);
 423                writel(in->d1, samsung->sabi_iface + SABI_IFACE_DATA + 4);
 424                writew(in->d2, samsung->sabi_iface + SABI_IFACE_DATA + 8);
 425                writeb(in->d3, samsung->sabi_iface + SABI_IFACE_DATA + 10);
 426        }
 427        outb(readb(samsung->sabi + config->header_offsets.iface_func), port);
 428
 429        /* write protect memory to make it safe */
 430        outb(readb(samsung->sabi + config->header_offsets.re_mem), port);
 431
 432        /* see if the command actually succeeded */
 433        complete = readb(samsung->sabi_iface + SABI_IFACE_COMPLETE);
 434        iface_data = readb(samsung->sabi_iface + SABI_IFACE_DATA);
 435
 436        /* iface_data = 0xFF happens when a command is not known
 437         * so we only add a warning in debug mode since we will
 438         * probably issue some unknown command at startup to find
 439         * out which features are supported */
 440        if (complete != 0xaa || (iface_data == 0xff && debug))
 441                pr_warn("SABI command 0x%04x failed with"
 442                        " completion flag 0x%02x and interface data 0x%02x",
 443                        command, complete, iface_data);
 444
 445        if (complete != 0xaa || iface_data == 0xff) {
 446                ret = -EINVAL;
 447                goto exit;
 448        }
 449
 450        if (out) {
 451                out->d0 = readl(samsung->sabi_iface + SABI_IFACE_DATA);
 452                out->d1 = readl(samsung->sabi_iface + SABI_IFACE_DATA + 4);
 453                out->d2 = readw(samsung->sabi_iface + SABI_IFACE_DATA + 2);
 454                out->d3 = readb(samsung->sabi_iface + SABI_IFACE_DATA + 1);
 455        }
 456
 457        if (debug && out) {
 458                pr_info("SABI return data:{0x%08x, 0x%08x, 0x%04x, 0x%02x}",
 459                        out->d0, out->d1, out->d2, out->d3);
 460        }
 461
 462exit:
 463        mutex_unlock(&samsung->sabi_mutex);
 464        return ret;
 465}
 466
 467/* simple wrappers usable with most commands */
 468static int sabi_set_commandb(struct samsung_laptop *samsung,
 469                             u16 command, u8 data)
 470{
 471        struct sabi_data in = { { { .d0 = 0, .d1 = 0, .d2 = 0, .d3 = 0 } } };
 472
 473        in.data[0] = data;
 474        return sabi_command(samsung, command, &in, NULL);
 475}
 476
 477static int read_brightness(struct samsung_laptop *samsung)
 478{
 479        const struct sabi_config *config = samsung->config;
 480        const struct sabi_commands *commands = &samsung->config->commands;
 481        struct sabi_data sretval;
 482        int user_brightness = 0;
 483        int retval;
 484
 485        retval = sabi_command(samsung, commands->get_brightness,
 486                              NULL, &sretval);
 487        if (retval)
 488                return retval;
 489
 490        user_brightness = sretval.data[0];
 491        if (user_brightness > config->min_brightness)
 492                user_brightness -= config->min_brightness;
 493        else
 494                user_brightness = 0;
 495
 496        return user_brightness;
 497}
 498
 499static void set_brightness(struct samsung_laptop *samsung, u8 user_brightness)
 500{
 501        const struct sabi_config *config = samsung->config;
 502        const struct sabi_commands *commands = &samsung->config->commands;
 503        u8 user_level = user_brightness + config->min_brightness;
 504
 505        if (samsung->has_stepping_quirk && user_level != 0) {
 506                /*
 507                 * short circuit if the specified level is what's already set
 508                 * to prevent the screen from flickering needlessly
 509                 */
 510                if (user_brightness == read_brightness(samsung))
 511                        return;
 512
 513                sabi_set_commandb(samsung, commands->set_brightness, 0);
 514        }
 515
 516        sabi_set_commandb(samsung, commands->set_brightness, user_level);
 517}
 518
 519static int get_brightness(struct backlight_device *bd)
 520{
 521        struct samsung_laptop *samsung = bl_get_data(bd);
 522
 523        return read_brightness(samsung);
 524}
 525
 526static void check_for_stepping_quirk(struct samsung_laptop *samsung)
 527{
 528        int initial_level;
 529        int check_level;
 530        int orig_level = read_brightness(samsung);
 531
 532        /*
 533         * Some laptops exhibit the strange behaviour of stepping toward
 534         * (rather than setting) the brightness except when changing to/from
 535         * brightness level 0. This behaviour is checked for here and worked
 536         * around in set_brightness.
 537         */
 538
 539        if (orig_level == 0)
 540                set_brightness(samsung, 1);
 541
 542        initial_level = read_brightness(samsung);
 543
 544        if (initial_level <= 2)
 545                check_level = initial_level + 2;
 546        else
 547                check_level = initial_level - 2;
 548
 549        samsung->has_stepping_quirk = false;
 550        set_brightness(samsung, check_level);
 551
 552        if (read_brightness(samsung) != check_level) {
 553                samsung->has_stepping_quirk = true;
 554                pr_info("enabled workaround for brightness stepping quirk\n");
 555        }
 556
 557        set_brightness(samsung, orig_level);
 558}
 559
 560static int update_status(struct backlight_device *bd)
 561{
 562        struct samsung_laptop *samsung = bl_get_data(bd);
 563        const struct sabi_commands *commands = &samsung->config->commands;
 564
 565        set_brightness(samsung, bd->props.brightness);
 566
 567        if (bd->props.power == FB_BLANK_UNBLANK)
 568                sabi_set_commandb(samsung, commands->set_backlight, 1);
 569        else
 570                sabi_set_commandb(samsung, commands->set_backlight, 0);
 571
 572        return 0;
 573}
 574
 575static const struct backlight_ops backlight_ops = {
 576        .get_brightness = get_brightness,
 577        .update_status  = update_status,
 578};
 579
 580static int seclinux_rfkill_set(void *data, bool blocked)
 581{
 582        struct samsung_rfkill *srfkill = data;
 583        struct samsung_laptop *samsung = srfkill->samsung;
 584        const struct sabi_commands *commands = &samsung->config->commands;
 585
 586        return sabi_set_commandb(samsung, commands->set_wireless_button,
 587                                 !blocked);
 588}
 589
 590static const struct rfkill_ops seclinux_rfkill_ops = {
 591        .set_block = seclinux_rfkill_set,
 592};
 593
 594static int swsmi_wireless_status(struct samsung_laptop *samsung,
 595                                 struct sabi_data *data)
 596{
 597        const struct sabi_commands *commands = &samsung->config->commands;
 598
 599        return sabi_command(samsung, commands->get_wireless_status,
 600                            NULL, data);
 601}
 602
 603static int swsmi_rfkill_set(void *priv, bool blocked)
 604{
 605        struct samsung_rfkill *srfkill = priv;
 606        struct samsung_laptop *samsung = srfkill->samsung;
 607        const struct sabi_commands *commands = &samsung->config->commands;
 608        struct sabi_data data;
 609        int ret, i;
 610
 611        ret = swsmi_wireless_status(samsung, &data);
 612        if (ret)
 613                return ret;
 614
 615        /* Don't set the state for non-present devices */
 616        for (i = 0; i < 4; i++)
 617                if (data.data[i] == 0x02)
 618                        data.data[1] = 0;
 619
 620        if (srfkill->type == RFKILL_TYPE_WLAN)
 621                data.data[WL_STATUS_WLAN] = !blocked;
 622        else if (srfkill->type == RFKILL_TYPE_BLUETOOTH)
 623                data.data[WL_STATUS_BT] = !blocked;
 624
 625        return sabi_command(samsung, commands->set_wireless_status,
 626                            &data, &data);
 627}
 628
 629static void swsmi_rfkill_query(struct rfkill *rfkill, void *priv)
 630{
 631        struct samsung_rfkill *srfkill = priv;
 632        struct samsung_laptop *samsung = srfkill->samsung;
 633        struct sabi_data data;
 634        int ret;
 635
 636        ret = swsmi_wireless_status(samsung, &data);
 637        if (ret)
 638                return ;
 639
 640        if (srfkill->type == RFKILL_TYPE_WLAN)
 641                ret = data.data[WL_STATUS_WLAN];
 642        else if (srfkill->type == RFKILL_TYPE_BLUETOOTH)
 643                ret = data.data[WL_STATUS_BT];
 644        else
 645                return ;
 646
 647        rfkill_set_sw_state(rfkill, !ret);
 648}
 649
 650static const struct rfkill_ops swsmi_rfkill_ops = {
 651        .set_block = swsmi_rfkill_set,
 652        .query = swsmi_rfkill_query,
 653};
 654
 655static ssize_t get_performance_level(struct device *dev,
 656                                     struct device_attribute *attr, char *buf)
 657{
 658        struct samsung_laptop *samsung = dev_get_drvdata(dev);
 659        const struct sabi_config *config = samsung->config;
 660        const struct sabi_commands *commands = &config->commands;
 661        struct sabi_data sretval;
 662        int retval;
 663        int i;
 664
 665        /* Read the state */
 666        retval = sabi_command(samsung, commands->get_performance_level,
 667                              NULL, &sretval);
 668        if (retval)
 669                return retval;
 670
 671        /* The logic is backwards, yeah, lots of fun... */
 672        for (i = 0; config->performance_levels[i].name; ++i) {
 673                if (sretval.data[0] == config->performance_levels[i].value)
 674                        return sprintf(buf, "%s\n", config->performance_levels[i].name);
 675        }
 676        return sprintf(buf, "%s\n", "unknown");
 677}
 678
 679static ssize_t set_performance_level(struct device *dev,
 680                                struct device_attribute *attr, const char *buf,
 681                                size_t count)
 682{
 683        struct samsung_laptop *samsung = dev_get_drvdata(dev);
 684        const struct sabi_config *config = samsung->config;
 685        const struct sabi_commands *commands = &config->commands;
 686        int i;
 687
 688        if (count < 1)
 689                return count;
 690
 691        for (i = 0; config->performance_levels[i].name; ++i) {
 692                const struct sabi_performance_level *level =
 693                        &config->performance_levels[i];
 694                if (!strncasecmp(level->name, buf, strlen(level->name))) {
 695                        sabi_set_commandb(samsung,
 696                                          commands->set_performance_level,
 697                                          level->value);
 698                        break;
 699                }
 700        }
 701
 702        if (!config->performance_levels[i].name)
 703                return -EINVAL;
 704
 705        return count;
 706}
 707
 708static DEVICE_ATTR(performance_level, S_IWUSR | S_IRUGO,
 709                   get_performance_level, set_performance_level);
 710
 711static int read_battery_life_extender(struct samsung_laptop *samsung)
 712{
 713        const struct sabi_commands *commands = &samsung->config->commands;
 714        struct sabi_data data;
 715        int retval;
 716
 717        if (commands->get_battery_life_extender == 0xFFFF)
 718                return -ENODEV;
 719
 720        memset(&data, 0, sizeof(data));
 721        data.data[0] = 0x80;
 722        retval = sabi_command(samsung, commands->get_battery_life_extender,
 723                              &data, &data);
 724
 725        if (retval)
 726                return retval;
 727
 728        if (data.data[0] != 0 && data.data[0] != 1)
 729                return -ENODEV;
 730
 731        return data.data[0];
 732}
 733
 734static int write_battery_life_extender(struct samsung_laptop *samsung,
 735                                       int enabled)
 736{
 737        const struct sabi_commands *commands = &samsung->config->commands;
 738        struct sabi_data data;
 739
 740        memset(&data, 0, sizeof(data));
 741        data.data[0] = 0x80 | enabled;
 742        return sabi_command(samsung, commands->set_battery_life_extender,
 743                            &data, NULL);
 744}
 745
 746static ssize_t get_battery_life_extender(struct device *dev,
 747                                         struct device_attribute *attr,
 748                                         char *buf)
 749{
 750        struct samsung_laptop *samsung = dev_get_drvdata(dev);
 751        int ret;
 752
 753        ret = read_battery_life_extender(samsung);
 754        if (ret < 0)
 755                return ret;
 756
 757        return sprintf(buf, "%d\n", ret);
 758}
 759
 760static ssize_t set_battery_life_extender(struct device *dev,
 761                                        struct device_attribute *attr,
 762                                        const char *buf, size_t count)
 763{
 764        struct samsung_laptop *samsung = dev_get_drvdata(dev);
 765        int ret, value;
 766
 767        if (!count || kstrtoint(buf, 0, &value) != 0)
 768                return -EINVAL;
 769
 770        ret = write_battery_life_extender(samsung, !!value);
 771        if (ret < 0)
 772                return ret;
 773
 774        return count;
 775}
 776
 777static DEVICE_ATTR(battery_life_extender, S_IWUSR | S_IRUGO,
 778                   get_battery_life_extender, set_battery_life_extender);
 779
 780static int read_usb_charge(struct samsung_laptop *samsung)
 781{
 782        const struct sabi_commands *commands = &samsung->config->commands;
 783        struct sabi_data data;
 784        int retval;
 785
 786        if (commands->get_usb_charge == 0xFFFF)
 787                return -ENODEV;
 788
 789        memset(&data, 0, sizeof(data));
 790        data.data[0] = 0x80;
 791        retval = sabi_command(samsung, commands->get_usb_charge,
 792                              &data, &data);
 793
 794        if (retval)
 795                return retval;
 796
 797        if (data.data[0] != 0 && data.data[0] != 1)
 798                return -ENODEV;
 799
 800        return data.data[0];
 801}
 802
 803static int write_usb_charge(struct samsung_laptop *samsung,
 804                            int enabled)
 805{
 806        const struct sabi_commands *commands = &samsung->config->commands;
 807        struct sabi_data data;
 808
 809        memset(&data, 0, sizeof(data));
 810        data.data[0] = 0x80 | enabled;
 811        return sabi_command(samsung, commands->set_usb_charge,
 812                            &data, NULL);
 813}
 814
 815static ssize_t get_usb_charge(struct device *dev,
 816                              struct device_attribute *attr,
 817                              char *buf)
 818{
 819        struct samsung_laptop *samsung = dev_get_drvdata(dev);
 820        int ret;
 821
 822        ret = read_usb_charge(samsung);
 823        if (ret < 0)
 824                return ret;
 825
 826        return sprintf(buf, "%d\n", ret);
 827}
 828
 829static ssize_t set_usb_charge(struct device *dev,
 830                              struct device_attribute *attr,
 831                              const char *buf, size_t count)
 832{
 833        struct samsung_laptop *samsung = dev_get_drvdata(dev);
 834        int ret, value;
 835
 836        if (!count || kstrtoint(buf, 0, &value) != 0)
 837                return -EINVAL;
 838
 839        ret = write_usb_charge(samsung, !!value);
 840        if (ret < 0)
 841                return ret;
 842
 843        return count;
 844}
 845
 846static DEVICE_ATTR(usb_charge, S_IWUSR | S_IRUGO,
 847                   get_usb_charge, set_usb_charge);
 848
 849static int read_lid_handling(struct samsung_laptop *samsung)
 850{
 851        const struct sabi_commands *commands = &samsung->config->commands;
 852        struct sabi_data data;
 853        int retval;
 854
 855        if (commands->get_lid_handling == 0xFFFF)
 856                return -ENODEV;
 857
 858        memset(&data, 0, sizeof(data));
 859        retval = sabi_command(samsung, commands->get_lid_handling,
 860                              &data, &data);
 861
 862        if (retval)
 863                return retval;
 864
 865        return data.data[0] & 0x1;
 866}
 867
 868static int write_lid_handling(struct samsung_laptop *samsung,
 869                              int enabled)
 870{
 871        const struct sabi_commands *commands = &samsung->config->commands;
 872        struct sabi_data data;
 873
 874        memset(&data, 0, sizeof(data));
 875        data.data[0] = 0x80 | enabled;
 876        return sabi_command(samsung, commands->set_lid_handling,
 877                            &data, NULL);
 878}
 879
 880static ssize_t get_lid_handling(struct device *dev,
 881                                struct device_attribute *attr,
 882                                char *buf)
 883{
 884        struct samsung_laptop *samsung = dev_get_drvdata(dev);
 885        int ret;
 886
 887        ret = read_lid_handling(samsung);
 888        if (ret < 0)
 889                return ret;
 890
 891        return sprintf(buf, "%d\n", ret);
 892}
 893
 894static ssize_t set_lid_handling(struct device *dev,
 895                                struct device_attribute *attr,
 896                                const char *buf, size_t count)
 897{
 898        struct samsung_laptop *samsung = dev_get_drvdata(dev);
 899        int ret, value;
 900
 901        if (!count || kstrtoint(buf, 0, &value) != 0)
 902                return -EINVAL;
 903
 904        ret = write_lid_handling(samsung, !!value);
 905        if (ret < 0)
 906                return ret;
 907
 908        return count;
 909}
 910
 911static DEVICE_ATTR(lid_handling, S_IWUSR | S_IRUGO,
 912                   get_lid_handling, set_lid_handling);
 913
 914static struct attribute *platform_attributes[] = {
 915        &dev_attr_performance_level.attr,
 916        &dev_attr_battery_life_extender.attr,
 917        &dev_attr_usb_charge.attr,
 918        &dev_attr_lid_handling.attr,
 919        NULL
 920};
 921
 922static int find_signature(void __iomem *memcheck, const char *testStr)
 923{
 924        int i = 0;
 925        int loca;
 926
 927        for (loca = 0; loca < 0xffff; loca++) {
 928                char temp = readb(memcheck + loca);
 929
 930                if (temp == testStr[i]) {
 931                        if (i == strlen(testStr)-1)
 932                                break;
 933                        ++i;
 934                } else {
 935                        i = 0;
 936                }
 937        }
 938        return loca;
 939}
 940
 941static void samsung_rfkill_exit(struct samsung_laptop *samsung)
 942{
 943        if (samsung->wlan.rfkill) {
 944                rfkill_unregister(samsung->wlan.rfkill);
 945                rfkill_destroy(samsung->wlan.rfkill);
 946                samsung->wlan.rfkill = NULL;
 947        }
 948        if (samsung->bluetooth.rfkill) {
 949                rfkill_unregister(samsung->bluetooth.rfkill);
 950                rfkill_destroy(samsung->bluetooth.rfkill);
 951                samsung->bluetooth.rfkill = NULL;
 952        }
 953}
 954
 955static int samsung_new_rfkill(struct samsung_laptop *samsung,
 956                              struct samsung_rfkill *arfkill,
 957                              const char *name, enum rfkill_type type,
 958                              const struct rfkill_ops *ops,
 959                              int blocked)
 960{
 961        struct rfkill **rfkill = &arfkill->rfkill;
 962        int ret;
 963
 964        arfkill->type = type;
 965        arfkill->samsung = samsung;
 966
 967        *rfkill = rfkill_alloc(name, &samsung->platform_device->dev,
 968                               type, ops, arfkill);
 969
 970        if (!*rfkill)
 971                return -EINVAL;
 972
 973        if (blocked != -1)
 974                rfkill_init_sw_state(*rfkill, blocked);
 975
 976        ret = rfkill_register(*rfkill);
 977        if (ret) {
 978                rfkill_destroy(*rfkill);
 979                *rfkill = NULL;
 980                return ret;
 981        }
 982        return 0;
 983}
 984
 985static int __init samsung_rfkill_init_seclinux(struct samsung_laptop *samsung)
 986{
 987        return samsung_new_rfkill(samsung, &samsung->wlan, "samsung-wlan",
 988                                  RFKILL_TYPE_WLAN, &seclinux_rfkill_ops, -1);
 989}
 990
 991static int __init samsung_rfkill_init_swsmi(struct samsung_laptop *samsung)
 992{
 993        struct sabi_data data;
 994        int ret;
 995
 996        ret = swsmi_wireless_status(samsung, &data);
 997        if (ret) {
 998                /* Some swsmi laptops use the old seclinux way to control
 999                 * wireless devices */
1000                if (ret == -EINVAL)
1001                        ret = samsung_rfkill_init_seclinux(samsung);
1002                return ret;
1003        }
1004
1005        /* 0x02 seems to mean that the device is no present/available */
1006
1007        if (data.data[WL_STATUS_WLAN] != 0x02)
1008                ret = samsung_new_rfkill(samsung, &samsung->wlan,
1009                                         "samsung-wlan",
1010                                         RFKILL_TYPE_WLAN,
1011                                         &swsmi_rfkill_ops,
1012                                         !data.data[WL_STATUS_WLAN]);
1013        if (ret)
1014                goto exit;
1015
1016        if (data.data[WL_STATUS_BT] != 0x02)
1017                ret = samsung_new_rfkill(samsung, &samsung->bluetooth,
1018                                         "samsung-bluetooth",
1019                                         RFKILL_TYPE_BLUETOOTH,
1020                                         &swsmi_rfkill_ops,
1021                                         !data.data[WL_STATUS_BT]);
1022        if (ret)
1023                goto exit;
1024
1025exit:
1026        if (ret)
1027                samsung_rfkill_exit(samsung);
1028
1029        return ret;
1030}
1031
1032static int __init samsung_rfkill_init(struct samsung_laptop *samsung)
1033{
1034        if (samsung->config->sabi_version == 2)
1035                return samsung_rfkill_init_seclinux(samsung);
1036        if (samsung->config->sabi_version == 3)
1037                return samsung_rfkill_init_swsmi(samsung);
1038        return 0;
1039}
1040
1041static void samsung_lid_handling_exit(struct samsung_laptop *samsung)
1042{
1043        if (samsung->quirks->lid_handling)
1044                write_lid_handling(samsung, 0);
1045}
1046
1047static int __init samsung_lid_handling_init(struct samsung_laptop *samsung)
1048{
1049        int retval = 0;
1050
1051        if (samsung->quirks->lid_handling)
1052                retval = write_lid_handling(samsung, 1);
1053
1054        return retval;
1055}
1056
1057static int kbd_backlight_enable(struct samsung_laptop *samsung)
1058{
1059        const struct sabi_commands *commands = &samsung->config->commands;
1060        struct sabi_data data;
1061        int retval;
1062
1063        if (commands->kbd_backlight == 0xFFFF)
1064                return -ENODEV;
1065
1066        memset(&data, 0, sizeof(data));
1067        data.d0 = 0xaabb;
1068        retval = sabi_command(samsung, commands->kbd_backlight,
1069                              &data, &data);
1070
1071        if (retval)
1072                return retval;
1073
1074        if (data.d0 != 0xccdd)
1075                return -ENODEV;
1076        return 0;
1077}
1078
1079static int kbd_backlight_read(struct samsung_laptop *samsung)
1080{
1081        const struct sabi_commands *commands = &samsung->config->commands;
1082        struct sabi_data data;
1083        int retval;
1084
1085        memset(&data, 0, sizeof(data));
1086        data.data[0] = 0x81;
1087        retval = sabi_command(samsung, commands->kbd_backlight,
1088                              &data, &data);
1089
1090        if (retval)
1091                return retval;
1092
1093        return data.data[0];
1094}
1095
1096static int kbd_backlight_write(struct samsung_laptop *samsung, int brightness)
1097{
1098        const struct sabi_commands *commands = &samsung->config->commands;
1099        struct sabi_data data;
1100
1101        memset(&data, 0, sizeof(data));
1102        data.d0 = 0x82 | ((brightness & 0xFF) << 8);
1103        return sabi_command(samsung, commands->kbd_backlight,
1104                            &data, NULL);
1105}
1106
1107static void kbd_led_update(struct work_struct *work)
1108{
1109        struct samsung_laptop *samsung;
1110
1111        samsung = container_of(work, struct samsung_laptop, kbd_led_work);
1112        kbd_backlight_write(samsung, samsung->kbd_led_wk);
1113}
1114
1115static void kbd_led_set(struct led_classdev *led_cdev,
1116                        enum led_brightness value)
1117{
1118        struct samsung_laptop *samsung;
1119
1120        samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
1121
1122        if (value > samsung->kbd_led.max_brightness)
1123                value = samsung->kbd_led.max_brightness;
1124        else if (value < 0)
1125                value = 0;
1126
1127        samsung->kbd_led_wk = value;
1128        queue_work(samsung->led_workqueue, &samsung->kbd_led_work);
1129}
1130
1131static enum led_brightness kbd_led_get(struct led_classdev *led_cdev)
1132{
1133        struct samsung_laptop *samsung;
1134
1135        samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
1136        return kbd_backlight_read(samsung);
1137}
1138
1139static void samsung_leds_exit(struct samsung_laptop *samsung)
1140{
1141        led_classdev_unregister(&samsung->kbd_led);
1142        if (samsung->led_workqueue)
1143                destroy_workqueue(samsung->led_workqueue);
1144}
1145
1146static int __init samsung_leds_init(struct samsung_laptop *samsung)
1147{
1148        int ret = 0;
1149
1150        samsung->led_workqueue = create_singlethread_workqueue("led_workqueue");
1151        if (!samsung->led_workqueue)
1152                return -ENOMEM;
1153
1154        if (kbd_backlight_enable(samsung) >= 0) {
1155                INIT_WORK(&samsung->kbd_led_work, kbd_led_update);
1156
1157                samsung->kbd_led.name = "samsung::kbd_backlight";
1158                samsung->kbd_led.brightness_set = kbd_led_set;
1159                samsung->kbd_led.brightness_get = kbd_led_get;
1160                samsung->kbd_led.max_brightness = 8;
1161                if (samsung->quirks->four_kbd_backlight_levels)
1162                        samsung->kbd_led.max_brightness = 4;
1163
1164                ret = led_classdev_register(&samsung->platform_device->dev,
1165                                           &samsung->kbd_led);
1166        }
1167
1168        if (ret)
1169                samsung_leds_exit(samsung);
1170
1171        return ret;
1172}
1173
1174static void samsung_backlight_exit(struct samsung_laptop *samsung)
1175{
1176        if (samsung->backlight_device) {
1177                backlight_device_unregister(samsung->backlight_device);
1178                samsung->backlight_device = NULL;
1179        }
1180}
1181
1182static int __init samsung_backlight_init(struct samsung_laptop *samsung)
1183{
1184        struct backlight_device *bd;
1185        struct backlight_properties props;
1186
1187        if (!samsung->handle_backlight)
1188                return 0;
1189
1190        memset(&props, 0, sizeof(struct backlight_properties));
1191        props.type = BACKLIGHT_PLATFORM;
1192        props.max_brightness = samsung->config->max_brightness -
1193                samsung->config->min_brightness;
1194
1195        bd = backlight_device_register("samsung",
1196                                       &samsung->platform_device->dev,
1197                                       samsung, &backlight_ops,
1198                                       &props);
1199        if (IS_ERR(bd))
1200                return PTR_ERR(bd);
1201
1202        samsung->backlight_device = bd;
1203        samsung->backlight_device->props.brightness = read_brightness(samsung);
1204        samsung->backlight_device->props.power = FB_BLANK_UNBLANK;
1205        backlight_update_status(samsung->backlight_device);
1206
1207        return 0;
1208}
1209
1210static umode_t samsung_sysfs_is_visible(struct kobject *kobj,
1211                                        struct attribute *attr, int idx)
1212{
1213        struct device *dev = container_of(kobj, struct device, kobj);
1214        struct samsung_laptop *samsung = dev_get_drvdata(dev);
1215        bool ok = true;
1216
1217        if (attr == &dev_attr_performance_level.attr)
1218                ok = !!samsung->config->performance_levels[0].name;
1219        if (attr == &dev_attr_battery_life_extender.attr)
1220                ok = !!(read_battery_life_extender(samsung) >= 0);
1221        if (attr == &dev_attr_usb_charge.attr)
1222                ok = !!(read_usb_charge(samsung) >= 0);
1223        if (attr == &dev_attr_lid_handling.attr)
1224                ok = !!(read_lid_handling(samsung) >= 0);
1225
1226        return ok ? attr->mode : 0;
1227}
1228
1229static const struct attribute_group platform_attribute_group = {
1230        .is_visible = samsung_sysfs_is_visible,
1231        .attrs = platform_attributes
1232};
1233
1234static void samsung_sysfs_exit(struct samsung_laptop *samsung)
1235{
1236        struct platform_device *device = samsung->platform_device;
1237
1238        sysfs_remove_group(&device->dev.kobj, &platform_attribute_group);
1239}
1240
1241static int __init samsung_sysfs_init(struct samsung_laptop *samsung)
1242{
1243        struct platform_device *device = samsung->platform_device;
1244
1245        return sysfs_create_group(&device->dev.kobj, &platform_attribute_group);
1246
1247}
1248
1249static int samsung_laptop_call_show(struct seq_file *m, void *data)
1250{
1251        struct samsung_laptop *samsung = m->private;
1252        struct sabi_data *sdata = &samsung->debug.data;
1253        int ret;
1254
1255        seq_printf(m, "SABI 0x%04x {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
1256                   samsung->debug.command,
1257                   sdata->d0, sdata->d1, sdata->d2, sdata->d3);
1258
1259        ret = sabi_command(samsung, samsung->debug.command, sdata, sdata);
1260
1261        if (ret) {
1262                seq_printf(m, "SABI command 0x%04x failed\n",
1263                           samsung->debug.command);
1264                return ret;
1265        }
1266
1267        seq_printf(m, "SABI {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
1268                   sdata->d0, sdata->d1, sdata->d2, sdata->d3);
1269        return 0;
1270}
1271DEFINE_SHOW_ATTRIBUTE(samsung_laptop_call);
1272
1273static void samsung_debugfs_exit(struct samsung_laptop *samsung)
1274{
1275        debugfs_remove_recursive(samsung->debug.root);
1276}
1277
1278static void samsung_debugfs_init(struct samsung_laptop *samsung)
1279{
1280        struct dentry *root;
1281
1282        root = debugfs_create_dir("samsung-laptop", NULL);
1283        samsung->debug.root = root;
1284
1285        samsung->debug.f0000_wrapper.data = samsung->f0000_segment;
1286        samsung->debug.f0000_wrapper.size = 0xffff;
1287
1288        samsung->debug.data_wrapper.data = &samsung->debug.data;
1289        samsung->debug.data_wrapper.size = sizeof(samsung->debug.data);
1290
1291        samsung->debug.sdiag_wrapper.data = samsung->sdiag;
1292        samsung->debug.sdiag_wrapper.size = strlen(samsung->sdiag);
1293
1294        debugfs_create_u16("command", S_IRUGO | S_IWUSR, root,
1295                           &samsung->debug.command);
1296        debugfs_create_u32("d0", S_IRUGO | S_IWUSR, root,
1297                           &samsung->debug.data.d0);
1298        debugfs_create_u32("d1", S_IRUGO | S_IWUSR, root,
1299                           &samsung->debug.data.d1);
1300        debugfs_create_u16("d2", S_IRUGO | S_IWUSR, root,
1301                           &samsung->debug.data.d2);
1302        debugfs_create_u8("d3", S_IRUGO | S_IWUSR, root,
1303                          &samsung->debug.data.d3);
1304        debugfs_create_blob("data", S_IRUGO | S_IWUSR, root,
1305                            &samsung->debug.data_wrapper);
1306        debugfs_create_blob("f0000_segment", S_IRUSR | S_IWUSR, root,
1307                            &samsung->debug.f0000_wrapper);
1308        debugfs_create_file("call", S_IFREG | S_IRUGO, root, samsung,
1309                            &samsung_laptop_call_fops);
1310        debugfs_create_blob("sdiag", S_IRUGO | S_IWUSR, root,
1311                            &samsung->debug.sdiag_wrapper);
1312}
1313
1314static void samsung_sabi_exit(struct samsung_laptop *samsung)
1315{
1316        const struct sabi_config *config = samsung->config;
1317
1318        /* Turn off "Linux" mode in the BIOS */
1319        if (config && config->commands.set_linux != 0xff)
1320                sabi_set_commandb(samsung, config->commands.set_linux, 0x80);
1321
1322        if (samsung->sabi_iface) {
1323                iounmap(samsung->sabi_iface);
1324                samsung->sabi_iface = NULL;
1325        }
1326        if (samsung->f0000_segment) {
1327                iounmap(samsung->f0000_segment);
1328                samsung->f0000_segment = NULL;
1329        }
1330
1331        samsung->config = NULL;
1332}
1333
1334static __init void samsung_sabi_infos(struct samsung_laptop *samsung, int loca,
1335                                      unsigned int ifaceP)
1336{
1337        const struct sabi_config *config = samsung->config;
1338
1339        printk(KERN_DEBUG "This computer supports SABI==%x\n",
1340               loca + 0xf0000 - 6);
1341
1342        printk(KERN_DEBUG "SABI header:\n");
1343        printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",
1344               readw(samsung->sabi + config->header_offsets.port));
1345        printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
1346               readb(samsung->sabi + config->header_offsets.iface_func));
1347        printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
1348               readb(samsung->sabi + config->header_offsets.en_mem));
1349        printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
1350               readb(samsung->sabi + config->header_offsets.re_mem));
1351        printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
1352               readw(samsung->sabi + config->header_offsets.data_offset));
1353        printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
1354               readw(samsung->sabi + config->header_offsets.data_segment));
1355
1356        printk(KERN_DEBUG " SABI pointer = 0x%08x\n", ifaceP);
1357}
1358
1359static void __init samsung_sabi_diag(struct samsung_laptop *samsung)
1360{
1361        int loca = find_signature(samsung->f0000_segment, "SDiaG@");
1362        int i;
1363
1364        if (loca == 0xffff)
1365                return ;
1366
1367        /* Example:
1368         * Ident: @SDiaG@686XX-N90X3A/966-SEC-07HL-S90X3A
1369         *
1370         * Product name: 90X3A
1371         * BIOS Version: 07HL
1372         */
1373        loca += 1;
1374        for (i = 0; loca < 0xffff && i < sizeof(samsung->sdiag) - 1; loca++) {
1375                char temp = readb(samsung->f0000_segment + loca);
1376
1377                if (isalnum(temp) || temp == '/' || temp == '-')
1378                        samsung->sdiag[i++] = temp;
1379                else
1380                        break ;
1381        }
1382
1383        if (debug && samsung->sdiag[0])
1384                pr_info("sdiag: %s", samsung->sdiag);
1385}
1386
1387static int __init samsung_sabi_init(struct samsung_laptop *samsung)
1388{
1389        const struct sabi_config *config = NULL;
1390        const struct sabi_commands *commands;
1391        unsigned int ifaceP;
1392        int loca = 0xffff;
1393        int ret = 0;
1394        int i;
1395
1396        samsung->f0000_segment = ioremap(0xf0000, 0xffff);
1397        if (!samsung->f0000_segment) {
1398                if (debug || force)
1399                        pr_err("Can't map the segment at 0xf0000\n");
1400                ret = -EINVAL;
1401                goto exit;
1402        }
1403
1404        samsung_sabi_diag(samsung);
1405
1406        /* Try to find one of the signatures in memory to find the header */
1407        for (i = 0; sabi_configs[i].test_string != NULL; ++i) {
1408                samsung->config = &sabi_configs[i];
1409                loca = find_signature(samsung->f0000_segment,
1410                                      samsung->config->test_string);
1411                if (loca != 0xffff)
1412                        break;
1413        }
1414
1415        if (loca == 0xffff) {
1416                if (debug || force)
1417                        pr_err("This computer does not support SABI\n");
1418                ret = -ENODEV;
1419                goto exit;
1420        }
1421
1422        config = samsung->config;
1423        commands = &config->commands;
1424
1425        /* point to the SMI port Number */
1426        loca += 1;
1427        samsung->sabi = (samsung->f0000_segment + loca);
1428
1429        /* Get a pointer to the SABI Interface */
1430        ifaceP = (readw(samsung->sabi + config->header_offsets.data_segment) & 0x0ffff) << 4;
1431        ifaceP += readw(samsung->sabi + config->header_offsets.data_offset) & 0x0ffff;
1432
1433        if (debug)
1434                samsung_sabi_infos(samsung, loca, ifaceP);
1435
1436        samsung->sabi_iface = ioremap(ifaceP, 16);
1437        if (!samsung->sabi_iface) {
1438                pr_err("Can't remap %x\n", ifaceP);
1439                ret = -EINVAL;
1440                goto exit;
1441        }
1442
1443        /* Turn on "Linux" mode in the BIOS */
1444        if (commands->set_linux != 0xff) {
1445                int retval = sabi_set_commandb(samsung,
1446                                               commands->set_linux, 0x81);
1447                if (retval) {
1448                        pr_warn("Linux mode was not set!\n");
1449                        ret = -ENODEV;
1450                        goto exit;
1451                }
1452        }
1453
1454        /* Check for stepping quirk */
1455        if (samsung->handle_backlight)
1456                check_for_stepping_quirk(samsung);
1457
1458        pr_info("detected SABI interface: %s\n",
1459                samsung->config->test_string);
1460
1461exit:
1462        if (ret)
1463                samsung_sabi_exit(samsung);
1464
1465        return ret;
1466}
1467
1468static void samsung_platform_exit(struct samsung_laptop *samsung)
1469{
1470        if (samsung->platform_device) {
1471                platform_device_unregister(samsung->platform_device);
1472                samsung->platform_device = NULL;
1473        }
1474}
1475
1476static int samsung_pm_notification(struct notifier_block *nb,
1477                                   unsigned long val, void *ptr)
1478{
1479        struct samsung_laptop *samsung;
1480
1481        samsung = container_of(nb, struct samsung_laptop, pm_nb);
1482        if (val == PM_POST_HIBERNATION &&
1483            samsung->quirks->enable_kbd_backlight)
1484                kbd_backlight_enable(samsung);
1485
1486        if (val == PM_POST_HIBERNATION && samsung->quirks->lid_handling)
1487                write_lid_handling(samsung, 1);
1488
1489        return 0;
1490}
1491
1492static int __init samsung_platform_init(struct samsung_laptop *samsung)
1493{
1494        struct platform_device *pdev;
1495
1496        pdev = platform_device_register_simple("samsung", -1, NULL, 0);
1497        if (IS_ERR(pdev))
1498                return PTR_ERR(pdev);
1499
1500        samsung->platform_device = pdev;
1501        platform_set_drvdata(samsung->platform_device, samsung);
1502        return 0;
1503}
1504
1505static struct samsung_quirks *quirks;
1506
1507static int __init samsung_dmi_matched(const struct dmi_system_id *d)
1508{
1509        quirks = d->driver_data;
1510        return 0;
1511}
1512
1513static const struct dmi_system_id samsung_dmi_table[] __initconst = {
1514        {
1515                .matches = {
1516                        DMI_MATCH(DMI_SYS_VENDOR,
1517                                        "SAMSUNG ELECTRONICS CO., LTD."),
1518                        DMI_MATCH(DMI_CHASSIS_TYPE, "8"), /* Portable */
1519                },
1520        },
1521        {
1522                .matches = {
1523                        DMI_MATCH(DMI_SYS_VENDOR,
1524                                        "SAMSUNG ELECTRONICS CO., LTD."),
1525                        DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /* Laptop */
1526                },
1527        },
1528        {
1529                .matches = {
1530                        DMI_MATCH(DMI_SYS_VENDOR,
1531                                        "SAMSUNG ELECTRONICS CO., LTD."),
1532                        DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /* Notebook */
1533                },
1534        },
1535        {
1536                .matches = {
1537                        DMI_MATCH(DMI_SYS_VENDOR,
1538                                        "SAMSUNG ELECTRONICS CO., LTD."),
1539                        DMI_MATCH(DMI_CHASSIS_TYPE, "14"), /* Sub-Notebook */
1540                },
1541        },
1542        /* DMI ids for laptops with bad Chassis Type */
1543        {
1544          .ident = "R40/R41",
1545          .matches = {
1546                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1547                DMI_MATCH(DMI_PRODUCT_NAME, "R40/R41"),
1548                DMI_MATCH(DMI_BOARD_NAME, "R40/R41"),
1549                },
1550        },
1551        /* Specific DMI ids for laptop with quirks */
1552        {
1553         .callback = samsung_dmi_matched,
1554         .ident = "N150P",
1555         .matches = {
1556                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1557                DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
1558                DMI_MATCH(DMI_BOARD_NAME, "N150P"),
1559                },
1560         .driver_data = &samsung_use_native_backlight,
1561        },
1562        {
1563         .callback = samsung_dmi_matched,
1564         .ident = "N145P/N250P/N260P",
1565         .matches = {
1566                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1567                DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
1568                DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
1569                },
1570         .driver_data = &samsung_use_native_backlight,
1571        },
1572        {
1573         .callback = samsung_dmi_matched,
1574         .ident = "N150/N210/N220",
1575         .matches = {
1576                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1577                DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
1578                DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
1579                },
1580         .driver_data = &samsung_broken_acpi_video,
1581        },
1582        {
1583         .callback = samsung_dmi_matched,
1584         .ident = "NF110/NF210/NF310",
1585         .matches = {
1586                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1587                DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
1588                DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
1589                },
1590         .driver_data = &samsung_broken_acpi_video,
1591        },
1592        {
1593         .callback = samsung_dmi_matched,
1594         .ident = "X360",
1595         .matches = {
1596                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1597                DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
1598                DMI_MATCH(DMI_BOARD_NAME, "X360"),
1599                },
1600         .driver_data = &samsung_broken_acpi_video,
1601        },
1602        {
1603         .callback = samsung_dmi_matched,
1604         .ident = "N250P",
1605         .matches = {
1606                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1607                DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
1608                DMI_MATCH(DMI_BOARD_NAME, "N250P"),
1609                },
1610         .driver_data = &samsung_use_native_backlight,
1611        },
1612        {
1613         .callback = samsung_dmi_matched,
1614         .ident = "NC210",
1615         .matches = {
1616                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1617                DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
1618                DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
1619                },
1620         .driver_data = &samsung_broken_acpi_video,
1621        },
1622        {
1623         .callback = samsung_dmi_matched,
1624         .ident = "730U3E/740U3E",
1625         .matches = {
1626                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1627                DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
1628                },
1629         .driver_data = &samsung_np740u3e,
1630        },
1631        {
1632         .callback = samsung_dmi_matched,
1633         .ident = "300V3Z/300V4Z/300V5Z",
1634         .matches = {
1635                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1636                DMI_MATCH(DMI_PRODUCT_NAME, "300V3Z/300V4Z/300V5Z"),
1637                },
1638         .driver_data = &samsung_lid_handling,
1639        },
1640        { },
1641};
1642MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
1643
1644static struct platform_device *samsung_platform_device;
1645
1646static int __init samsung_init(void)
1647{
1648        struct samsung_laptop *samsung;
1649        int ret;
1650
1651        if (efi_enabled(EFI_BOOT))
1652                return -ENODEV;
1653
1654        quirks = &samsung_unknown;
1655        if (!force && !dmi_check_system(samsung_dmi_table))
1656                return -ENODEV;
1657
1658        samsung = kzalloc(sizeof(*samsung), GFP_KERNEL);
1659        if (!samsung)
1660                return -ENOMEM;
1661
1662        mutex_init(&samsung->sabi_mutex);
1663        samsung->handle_backlight = true;
1664        samsung->quirks = quirks;
1665
1666#ifdef CONFIG_ACPI
1667        if (samsung->quirks->broken_acpi_video)
1668                acpi_video_set_dmi_backlight_type(acpi_backlight_vendor);
1669        if (samsung->quirks->use_native_backlight)
1670                acpi_video_set_dmi_backlight_type(acpi_backlight_native);
1671
1672        if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
1673                samsung->handle_backlight = false;
1674#endif
1675
1676        ret = samsung_platform_init(samsung);
1677        if (ret)
1678                goto error_platform;
1679
1680        ret = samsung_sabi_init(samsung);
1681        if (ret)
1682                goto error_sabi;
1683
1684        ret = samsung_sysfs_init(samsung);
1685        if (ret)
1686                goto error_sysfs;
1687
1688        ret = samsung_backlight_init(samsung);
1689        if (ret)
1690                goto error_backlight;
1691
1692        ret = samsung_rfkill_init(samsung);
1693        if (ret)
1694                goto error_rfkill;
1695
1696        ret = samsung_leds_init(samsung);
1697        if (ret)
1698                goto error_leds;
1699
1700        ret = samsung_lid_handling_init(samsung);
1701        if (ret)
1702                goto error_lid_handling;
1703
1704        samsung_debugfs_init(samsung);
1705
1706        samsung->pm_nb.notifier_call = samsung_pm_notification;
1707        register_pm_notifier(&samsung->pm_nb);
1708
1709        samsung_platform_device = samsung->platform_device;
1710        return ret;
1711
1712error_lid_handling:
1713        samsung_leds_exit(samsung);
1714error_leds:
1715        samsung_rfkill_exit(samsung);
1716error_rfkill:
1717        samsung_backlight_exit(samsung);
1718error_backlight:
1719        samsung_sysfs_exit(samsung);
1720error_sysfs:
1721        samsung_sabi_exit(samsung);
1722error_sabi:
1723        samsung_platform_exit(samsung);
1724error_platform:
1725        kfree(samsung);
1726        return ret;
1727}
1728
1729static void __exit samsung_exit(void)
1730{
1731        struct samsung_laptop *samsung;
1732
1733        samsung = platform_get_drvdata(samsung_platform_device);
1734        unregister_pm_notifier(&samsung->pm_nb);
1735
1736        samsung_debugfs_exit(samsung);
1737        samsung_lid_handling_exit(samsung);
1738        samsung_leds_exit(samsung);
1739        samsung_rfkill_exit(samsung);
1740        samsung_backlight_exit(samsung);
1741        samsung_sysfs_exit(samsung);
1742        samsung_sabi_exit(samsung);
1743        samsung_platform_exit(samsung);
1744
1745        kfree(samsung);
1746        samsung_platform_device = NULL;
1747}
1748
1749module_init(samsung_init);
1750module_exit(samsung_exit);
1751
1752MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
1753MODULE_DESCRIPTION("Samsung Backlight driver");
1754MODULE_LICENSE("GPL");
1755