linux/drivers/misc/asus-laptop.c
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   1/*
   2 *  asus-laptop.c - Asus Laptop Support
   3 *
   4 *
   5 *  Copyright (C) 2002-2005 Julien Lerouge, 2003-2006 Karol Kozimor
   6 *  Copyright (C) 2006-2007 Corentin Chary
   7 *
   8 *  This program is free software; you can redistribute it and/or modify
   9 *  it under the terms of the GNU General Public License as published by
  10 *  the Free Software Foundation; either version 2 of the License, or
  11 *  (at your option) any later version.
  12 *
  13 *  This program is distributed in the hope that it will be useful,
  14 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 *  GNU General Public License for more details.
  17 *
  18 *  You should have received a copy of the GNU General Public License
  19 *  along with this program; if not, write to the Free Software
  20 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21 *
  22 *
  23 *  The development page for this driver is located at
  24 *  http://sourceforge.net/projects/acpi4asus/
  25 *
  26 *  Credits:
  27 *  Pontus Fuchs   - Helper functions, cleanup
  28 *  Johann Wiesner - Small compile fixes
  29 *  John Belmonte  - ACPI code for Toshiba laptop was a good starting point.
  30 *  Eric Burghard  - LED display support for W1N
  31 *  Josh Green     - Light Sens support
  32 *  Thomas Tuttle  - His first patch for led support was very helpfull
  33 *  Sam Lin        - GPS support
  34 */
  35
  36#include <linux/kernel.h>
  37#include <linux/module.h>
  38#include <linux/init.h>
  39#include <linux/types.h>
  40#include <linux/err.h>
  41#include <linux/proc_fs.h>
  42#include <linux/backlight.h>
  43#include <linux/fb.h>
  44#include <linux/leds.h>
  45#include <linux/platform_device.h>
  46#include <acpi/acpi_drivers.h>
  47#include <acpi/acpi_bus.h>
  48#include <asm/uaccess.h>
  49
  50#define ASUS_LAPTOP_VERSION "0.42"
  51
  52#define ASUS_HOTK_NAME          "Asus Laptop Support"
  53#define ASUS_HOTK_CLASS         "hotkey"
  54#define ASUS_HOTK_DEVICE_NAME   "Hotkey"
  55#define ASUS_HOTK_FILE          "asus-laptop"
  56#define ASUS_HOTK_PREFIX        "\\_SB.ATKD."
  57
  58/*
  59 * Some events we use, same for all Asus
  60 */
  61#define ATKD_BR_UP       0x10
  62#define ATKD_BR_DOWN     0x20
  63#define ATKD_LCD_ON      0x33
  64#define ATKD_LCD_OFF     0x34
  65
  66/*
  67 * Known bits returned by \_SB.ATKD.HWRS
  68 */
  69#define WL_HWRS     0x80
  70#define BT_HWRS     0x100
  71
  72/*
  73 * Flags for hotk status
  74 * WL_ON and BT_ON are also used for wireless_status()
  75 */
  76#define WL_ON       0x01        //internal Wifi
  77#define BT_ON       0x02        //internal Bluetooth
  78#define MLED_ON     0x04        //mail LED
  79#define TLED_ON     0x08        //touchpad LED
  80#define RLED_ON     0x10        //Record LED
  81#define PLED_ON     0x20        //Phone LED
  82#define GLED_ON     0x40        //Gaming LED
  83#define LCD_ON      0x80        //LCD backlight
  84#define GPS_ON      0x100       //GPS
  85
  86#define ASUS_LOG    ASUS_HOTK_FILE ": "
  87#define ASUS_ERR    KERN_ERR    ASUS_LOG
  88#define ASUS_WARNING    KERN_WARNING    ASUS_LOG
  89#define ASUS_NOTICE KERN_NOTICE ASUS_LOG
  90#define ASUS_INFO   KERN_INFO   ASUS_LOG
  91#define ASUS_DEBUG  KERN_DEBUG  ASUS_LOG
  92
  93MODULE_AUTHOR("Julien Lerouge, Karol Kozimor, Corentin Chary");
  94MODULE_DESCRIPTION(ASUS_HOTK_NAME);
  95MODULE_LICENSE("GPL");
  96
  97/* WAPF defines the behavior of the Fn+Fx wlan key
  98 * The significance of values is yet to be found, but
  99 * most of the time:
 100 * 0x0 will do nothing
 101 * 0x1 will allow to control the device with Fn+Fx key.
 102 * 0x4 will send an ACPI event (0x88) while pressing the Fn+Fx key
 103 * 0x5 like 0x1 or 0x4
 104 * So, if something doesn't work as you want, just try other values =)
 105 */
 106static uint wapf = 1;
 107module_param(wapf, uint, 0644);
 108MODULE_PARM_DESC(wapf, "WAPF value");
 109
 110#define ASUS_HANDLE(object, paths...)                                   \
 111        static acpi_handle  object##_handle = NULL;                     \
 112        static char *object##_paths[] = { paths }
 113
 114/* LED */
 115ASUS_HANDLE(mled_set, ASUS_HOTK_PREFIX "MLED");
 116ASUS_HANDLE(tled_set, ASUS_HOTK_PREFIX "TLED");
 117ASUS_HANDLE(rled_set, ASUS_HOTK_PREFIX "RLED"); /* W1JC */
 118ASUS_HANDLE(pled_set, ASUS_HOTK_PREFIX "PLED"); /* A7J */
 119ASUS_HANDLE(gled_set, ASUS_HOTK_PREFIX "GLED"); /* G1, G2 (probably) */
 120
 121/* LEDD */
 122ASUS_HANDLE(ledd_set, ASUS_HOTK_PREFIX "SLCM");
 123
 124/* Bluetooth and WLAN
 125 * WLED and BLED are not handled like other XLED, because in some dsdt
 126 * they also control the WLAN/Bluetooth device.
 127 */
 128ASUS_HANDLE(wl_switch, ASUS_HOTK_PREFIX "WLED");
 129ASUS_HANDLE(bt_switch, ASUS_HOTK_PREFIX "BLED");
 130ASUS_HANDLE(wireless_status, ASUS_HOTK_PREFIX "RSTS");  /* All new models */
 131
 132/* Brightness */
 133ASUS_HANDLE(brightness_set, ASUS_HOTK_PREFIX "SPLV");
 134ASUS_HANDLE(brightness_get, ASUS_HOTK_PREFIX "GPLV");
 135
 136/* Backlight */
 137ASUS_HANDLE(lcd_switch, "\\_SB.PCI0.SBRG.EC0._Q10",     /* All new models */
 138            "\\_SB.PCI0.ISA.EC0._Q10",  /* A1x */
 139            "\\_SB.PCI0.PX40.ECD0._Q10",        /* L3C */
 140            "\\_SB.PCI0.PX40.EC0.Q10",  /* M1A */
 141            "\\_SB.PCI0.LPCB.EC0._Q10", /* P30 */
 142            "\\_SB.PCI0.LPCB.EC0._Q0E", /* P30/P35 */
 143            "\\_SB.PCI0.PX40.Q10",      /* S1x */
 144            "\\Q10");           /* A2x, L2D, L3D, M2E */
 145
 146/* Display */
 147ASUS_HANDLE(display_set, ASUS_HOTK_PREFIX "SDSP");
 148ASUS_HANDLE(display_get, "\\_SB.PCI0.P0P1.VGA.GETD",    /*  A6B, A6K A6R A7D F3JM L4R M6R A3G
 149                                                           M6A M6V VX-1 V6J V6V W3Z */
 150            "\\_SB.PCI0.P0P2.VGA.GETD", /* A3E A4K, A4D A4L A6J A7J A8J Z71V M9V
 151                                           S5A M5A z33A W1Jc W2V G1 */
 152            "\\_SB.PCI0.P0P3.VGA.GETD", /* A6V A6Q */
 153            "\\_SB.PCI0.P0PA.VGA.GETD", /* A6T, A6M */
 154            "\\_SB.PCI0.PCI1.VGAC.NMAP",        /* L3C */
 155            "\\_SB.PCI0.VGA.GETD",      /* Z96F */
 156            "\\ACTD",           /* A2D */
 157            "\\ADVG",           /* A4G Z71A W1N W5A W5F M2N M3N M5N M6N S1N S5N */
 158            "\\DNXT",           /* P30 */
 159            "\\INFB",           /* A2H D1 L2D L3D L3H L2E L5D L5C M1A M2E L4L W3V */
 160            "\\SSTE");          /* A3F A6F A3N A3L M6N W3N W6A */
 161
 162ASUS_HANDLE(ls_switch, ASUS_HOTK_PREFIX "ALSC");        /* Z71A Z71V */
 163ASUS_HANDLE(ls_level, ASUS_HOTK_PREFIX "ALSL"); /* Z71A Z71V */
 164
 165/* GPS */
 166/* R2H use different handle for GPS on/off */
 167ASUS_HANDLE(gps_on, ASUS_HOTK_PREFIX "SDON");   /* R2H */
 168ASUS_HANDLE(gps_off, ASUS_HOTK_PREFIX "SDOF");  /* R2H */
 169ASUS_HANDLE(gps_status, ASUS_HOTK_PREFIX "GPST");
 170
 171/*
 172 * This is the main structure, we can use it to store anything interesting
 173 * about the hotk device
 174 */
 175struct asus_hotk {
 176        char *name;             //laptop name
 177        struct acpi_device *device;     //the device we are in
 178        acpi_handle handle;     //the handle of the hotk device
 179        char status;            //status of the hotk, for LEDs, ...
 180        u32 ledd_status;        //status of the LED display
 181        u8 light_level;         //light sensor level
 182        u8 light_switch;        //light sensor switch value
 183        u16 event_count[128];   //count for each event TODO make this better
 184};
 185
 186/*
 187 * This header is made available to allow proper configuration given model,
 188 * revision number , ... this info cannot go in struct asus_hotk because it is
 189 * available before the hotk
 190 */
 191static struct acpi_table_header *asus_info;
 192
 193/* The actual device the driver binds to */
 194static struct asus_hotk *hotk;
 195
 196/*
 197 * The hotkey driver declaration
 198 */
 199static const struct acpi_device_id asus_device_ids[] = {
 200        {"ATK0100", 0},
 201        {"", 0},
 202};
 203MODULE_DEVICE_TABLE(acpi, asus_device_ids);
 204
 205static int asus_hotk_add(struct acpi_device *device);
 206static int asus_hotk_remove(struct acpi_device *device, int type);
 207static struct acpi_driver asus_hotk_driver = {
 208        .name = ASUS_HOTK_NAME,
 209        .class = ASUS_HOTK_CLASS,
 210        .ids = asus_device_ids,
 211        .ops = {
 212                .add = asus_hotk_add,
 213                .remove = asus_hotk_remove,
 214                },
 215};
 216
 217/* The backlight device /sys/class/backlight */
 218static struct backlight_device *asus_backlight_device;
 219
 220/*
 221 * The backlight class declaration
 222 */
 223static int read_brightness(struct backlight_device *bd);
 224static int update_bl_status(struct backlight_device *bd);
 225static struct backlight_ops asusbl_ops = {
 226        .get_brightness = read_brightness,
 227        .update_status = update_bl_status,
 228};
 229
 230/* These functions actually update the LED's, and are called from a
 231 * workqueue. By doing this as separate work rather than when the LED
 232 * subsystem asks, we avoid messing with the Asus ACPI stuff during a
 233 * potentially bad time, such as a timer interrupt. */
 234static struct workqueue_struct *led_workqueue;
 235
 236#define ASUS_LED(object, ledname)                                       \
 237        static void object##_led_set(struct led_classdev *led_cdev,     \
 238                                     enum led_brightness value);        \
 239        static void object##_led_update(struct work_struct *ignored);   \
 240        static int object##_led_wk;                                     \
 241        static DECLARE_WORK(object##_led_work, object##_led_update);    \
 242        static struct led_classdev object##_led = {                     \
 243                .name           = "asus::" ledname,                     \
 244                .brightness_set = object##_led_set,                     \
 245        }
 246
 247ASUS_LED(mled, "mail");
 248ASUS_LED(tled, "touchpad");
 249ASUS_LED(rled, "record");
 250ASUS_LED(pled, "phone");
 251ASUS_LED(gled, "gaming");
 252
 253/*
 254 * This function evaluates an ACPI method, given an int as parameter, the
 255 * method is searched within the scope of the handle, can be NULL. The output
 256 * of the method is written is output, which can also be NULL
 257 *
 258 * returns 0 if write is successful, -1 else.
 259 */
 260static int write_acpi_int(acpi_handle handle, const char *method, int val,
 261                          struct acpi_buffer *output)
 262{
 263        struct acpi_object_list params; //list of input parameters (an int here)
 264        union acpi_object in_obj;       //the only param we use
 265        acpi_status status;
 266
 267        if (!handle)
 268                return 0;
 269
 270        params.count = 1;
 271        params.pointer = &in_obj;
 272        in_obj.type = ACPI_TYPE_INTEGER;
 273        in_obj.integer.value = val;
 274
 275        status = acpi_evaluate_object(handle, (char *)method, &params, output);
 276        if (status == AE_OK)
 277                return 0;
 278        else
 279                return -1;
 280}
 281
 282static int read_wireless_status(int mask)
 283{
 284        unsigned long long status;
 285        acpi_status rv = AE_OK;
 286
 287        if (!wireless_status_handle)
 288                return (hotk->status & mask) ? 1 : 0;
 289
 290        rv = acpi_evaluate_integer(wireless_status_handle, NULL, NULL, &status);
 291        if (ACPI_FAILURE(rv))
 292                printk(ASUS_WARNING "Error reading Wireless status\n");
 293        else
 294                return (status & mask) ? 1 : 0;
 295
 296        return (hotk->status & mask) ? 1 : 0;
 297}
 298
 299static int read_gps_status(void)
 300{
 301        unsigned long long status;
 302        acpi_status rv = AE_OK;
 303
 304        rv = acpi_evaluate_integer(gps_status_handle, NULL, NULL, &status);
 305        if (ACPI_FAILURE(rv))
 306                printk(ASUS_WARNING "Error reading GPS status\n");
 307        else
 308                return status ? 1 : 0;
 309
 310        return (hotk->status & GPS_ON) ? 1 : 0;
 311}
 312
 313/* Generic LED functions */
 314static int read_status(int mask)
 315{
 316        /* There is a special method for both wireless devices */
 317        if (mask == BT_ON || mask == WL_ON)
 318                return read_wireless_status(mask);
 319        else if (mask == GPS_ON)
 320                return read_gps_status();
 321
 322        return (hotk->status & mask) ? 1 : 0;
 323}
 324
 325static void write_status(acpi_handle handle, int out, int mask)
 326{
 327        hotk->status = (out) ? (hotk->status | mask) : (hotk->status & ~mask);
 328
 329        switch (mask) {
 330        case MLED_ON:
 331                out = !(out & 0x1);
 332                break;
 333        case GLED_ON:
 334                out = (out & 0x1) + 1;
 335                break;
 336        case GPS_ON:
 337                handle = (out) ? gps_on_handle : gps_off_handle;
 338                out = 0x02;
 339                break;
 340        default:
 341                out &= 0x1;
 342                break;
 343        }
 344
 345        if (write_acpi_int(handle, NULL, out, NULL))
 346                printk(ASUS_WARNING " write failed %x\n", mask);
 347}
 348
 349/* /sys/class/led handlers */
 350#define ASUS_LED_HANDLER(object, mask)                                  \
 351        static void object##_led_set(struct led_classdev *led_cdev,     \
 352                                     enum led_brightness value)         \
 353        {                                                               \
 354                object##_led_wk = (value > 0) ? 1 : 0;                  \
 355                queue_work(led_workqueue, &object##_led_work);          \
 356        }                                                               \
 357        static void object##_led_update(struct work_struct *ignored)    \
 358        {                                                               \
 359                int value = object##_led_wk;                            \
 360                write_status(object##_set_handle, value, (mask));       \
 361        }
 362
 363ASUS_LED_HANDLER(mled, MLED_ON);
 364ASUS_LED_HANDLER(pled, PLED_ON);
 365ASUS_LED_HANDLER(rled, RLED_ON);
 366ASUS_LED_HANDLER(tled, TLED_ON);
 367ASUS_LED_HANDLER(gled, GLED_ON);
 368
 369static int get_lcd_state(void)
 370{
 371        return read_status(LCD_ON);
 372}
 373
 374static int set_lcd_state(int value)
 375{
 376        int lcd = 0;
 377        acpi_status status = 0;
 378
 379        lcd = value ? 1 : 0;
 380
 381        if (lcd == get_lcd_state())
 382                return 0;
 383
 384        if (lcd_switch_handle) {
 385                status = acpi_evaluate_object(lcd_switch_handle,
 386                                              NULL, NULL, NULL);
 387
 388                if (ACPI_FAILURE(status))
 389                        printk(ASUS_WARNING "Error switching LCD\n");
 390        }
 391
 392        write_status(NULL, lcd, LCD_ON);
 393        return 0;
 394}
 395
 396static void lcd_blank(int blank)
 397{
 398        struct backlight_device *bd = asus_backlight_device;
 399
 400        if (bd) {
 401                bd->props.power = blank;
 402                backlight_update_status(bd);
 403        }
 404}
 405
 406static int read_brightness(struct backlight_device *bd)
 407{
 408        unsigned long long value;
 409        acpi_status rv = AE_OK;
 410
 411        rv = acpi_evaluate_integer(brightness_get_handle, NULL, NULL, &value);
 412        if (ACPI_FAILURE(rv))
 413                printk(ASUS_WARNING "Error reading brightness\n");
 414
 415        return value;
 416}
 417
 418static int set_brightness(struct backlight_device *bd, int value)
 419{
 420        int ret = 0;
 421
 422        value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
 423        /* 0 <= value <= 15 */
 424
 425        if (write_acpi_int(brightness_set_handle, NULL, value, NULL)) {
 426                printk(ASUS_WARNING "Error changing brightness\n");
 427                ret = -EIO;
 428        }
 429
 430        return ret;
 431}
 432
 433static int update_bl_status(struct backlight_device *bd)
 434{
 435        int rv;
 436        int value = bd->props.brightness;
 437
 438        rv = set_brightness(bd, value);
 439        if (rv)
 440                return rv;
 441
 442        value = (bd->props.power == FB_BLANK_UNBLANK) ? 1 : 0;
 443        return set_lcd_state(value);
 444}
 445
 446/*
 447 * Platform device handlers
 448 */
 449
 450/*
 451 * We write our info in page, we begin at offset off and cannot write more
 452 * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 453 * number of bytes written in page
 454 */
 455static ssize_t show_infos(struct device *dev,
 456                          struct device_attribute *attr, char *page)
 457{
 458        int len = 0;
 459        unsigned long long temp;
 460        char buf[16];           //enough for all info
 461        acpi_status rv = AE_OK;
 462
 463        /*
 464         * We use the easy way, we don't care of off and count, so we don't set eof
 465         * to 1
 466         */
 467
 468        len += sprintf(page, ASUS_HOTK_NAME " " ASUS_LAPTOP_VERSION "\n");
 469        len += sprintf(page + len, "Model reference    : %s\n", hotk->name);
 470        /*
 471         * The SFUN method probably allows the original driver to get the list
 472         * of features supported by a given model. For now, 0x0100 or 0x0800
 473         * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
 474         * The significance of others is yet to be found.
 475         */
 476        rv = acpi_evaluate_integer(hotk->handle, "SFUN", NULL, &temp);
 477        if (!ACPI_FAILURE(rv))
 478                len += sprintf(page + len, "SFUN value         : 0x%04x\n",
 479                               (uint) temp);
 480        /*
 481         * Another value for userspace: the ASYM method returns 0x02 for
 482         * battery low and 0x04 for battery critical, its readings tend to be
 483         * more accurate than those provided by _BST.
 484         * Note: since not all the laptops provide this method, errors are
 485         * silently ignored.
 486         */
 487        rv = acpi_evaluate_integer(hotk->handle, "ASYM", NULL, &temp);
 488        if (!ACPI_FAILURE(rv))
 489                len += sprintf(page + len, "ASYM value         : 0x%04x\n",
 490                               (uint) temp);
 491        if (asus_info) {
 492                snprintf(buf, 16, "%d", asus_info->length);
 493                len += sprintf(page + len, "DSDT length        : %s\n", buf);
 494                snprintf(buf, 16, "%d", asus_info->checksum);
 495                len += sprintf(page + len, "DSDT checksum      : %s\n", buf);
 496                snprintf(buf, 16, "%d", asus_info->revision);
 497                len += sprintf(page + len, "DSDT revision      : %s\n", buf);
 498                snprintf(buf, 7, "%s", asus_info->oem_id);
 499                len += sprintf(page + len, "OEM id             : %s\n", buf);
 500                snprintf(buf, 9, "%s", asus_info->oem_table_id);
 501                len += sprintf(page + len, "OEM table id       : %s\n", buf);
 502                snprintf(buf, 16, "%x", asus_info->oem_revision);
 503                len += sprintf(page + len, "OEM revision       : 0x%s\n", buf);
 504                snprintf(buf, 5, "%s", asus_info->asl_compiler_id);
 505                len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);
 506                snprintf(buf, 16, "%x", asus_info->asl_compiler_revision);
 507                len += sprintf(page + len, "ASL comp revision  : 0x%s\n", buf);
 508        }
 509
 510        return len;
 511}
 512
 513static int parse_arg(const char *buf, unsigned long count, int *val)
 514{
 515        if (!count)
 516                return 0;
 517        if (count > 31)
 518                return -EINVAL;
 519        if (sscanf(buf, "%i", val) != 1)
 520                return -EINVAL;
 521        return count;
 522}
 523
 524static ssize_t store_status(const char *buf, size_t count,
 525                            acpi_handle handle, int mask)
 526{
 527        int rv, value;
 528        int out = 0;
 529
 530        rv = parse_arg(buf, count, &value);
 531        if (rv > 0)
 532                out = value ? 1 : 0;
 533
 534        write_status(handle, out, mask);
 535
 536        return rv;
 537}
 538
 539/*
 540 * LEDD display
 541 */
 542static ssize_t show_ledd(struct device *dev,
 543                         struct device_attribute *attr, char *buf)
 544{
 545        return sprintf(buf, "0x%08x\n", hotk->ledd_status);
 546}
 547
 548static ssize_t store_ledd(struct device *dev, struct device_attribute *attr,
 549                          const char *buf, size_t count)
 550{
 551        int rv, value;
 552
 553        rv = parse_arg(buf, count, &value);
 554        if (rv > 0) {
 555                if (write_acpi_int(ledd_set_handle, NULL, value, NULL))
 556                        printk(ASUS_WARNING "LED display write failed\n");
 557                else
 558                        hotk->ledd_status = (u32) value;
 559        }
 560        return rv;
 561}
 562
 563/*
 564 * WLAN
 565 */
 566static ssize_t show_wlan(struct device *dev,
 567                         struct device_attribute *attr, char *buf)
 568{
 569        return sprintf(buf, "%d\n", read_status(WL_ON));
 570}
 571
 572static ssize_t store_wlan(struct device *dev, struct device_attribute *attr,
 573                          const char *buf, size_t count)
 574{
 575        return store_status(buf, count, wl_switch_handle, WL_ON);
 576}
 577
 578/*
 579 * Bluetooth
 580 */
 581static ssize_t show_bluetooth(struct device *dev,
 582                              struct device_attribute *attr, char *buf)
 583{
 584        return sprintf(buf, "%d\n", read_status(BT_ON));
 585}
 586
 587static ssize_t store_bluetooth(struct device *dev,
 588                               struct device_attribute *attr, const char *buf,
 589                               size_t count)
 590{
 591        return store_status(buf, count, bt_switch_handle, BT_ON);
 592}
 593
 594/*
 595 * Display
 596 */
 597static void set_display(int value)
 598{
 599        /* no sanity check needed for now */
 600        if (write_acpi_int(display_set_handle, NULL, value, NULL))
 601                printk(ASUS_WARNING "Error setting display\n");
 602        return;
 603}
 604
 605static int read_display(void)
 606{
 607        unsigned long long value = 0;
 608        acpi_status rv = AE_OK;
 609
 610        /* In most of the case, we know how to set the display, but sometime
 611           we can't read it */
 612        if (display_get_handle) {
 613                rv = acpi_evaluate_integer(display_get_handle, NULL,
 614                                           NULL, &value);
 615                if (ACPI_FAILURE(rv))
 616                        printk(ASUS_WARNING "Error reading display status\n");
 617        }
 618
 619        value &= 0x0F;          /* needed for some models, shouldn't hurt others */
 620
 621        return value;
 622}
 623
 624/*
 625 * Now, *this* one could be more user-friendly, but so far, no-one has
 626 * complained. The significance of bits is the same as in store_disp()
 627 */
 628static ssize_t show_disp(struct device *dev,
 629                         struct device_attribute *attr, char *buf)
 630{
 631        return sprintf(buf, "%d\n", read_display());
 632}
 633
 634/*
 635 * Experimental support for display switching. As of now: 1 should activate
 636 * the LCD output, 2 should do for CRT, 4 for TV-Out and 8 for DVI.
 637 * Any combination (bitwise) of these will suffice. I never actually tested 4
 638 * displays hooked up simultaneously, so be warned. See the acpi4asus README
 639 * for more info.
 640 */
 641static ssize_t store_disp(struct device *dev, struct device_attribute *attr,
 642                          const char *buf, size_t count)
 643{
 644        int rv, value;
 645
 646        rv = parse_arg(buf, count, &value);
 647        if (rv > 0)
 648                set_display(value);
 649        return rv;
 650}
 651
 652/*
 653 * Light Sens
 654 */
 655static void set_light_sens_switch(int value)
 656{
 657        if (write_acpi_int(ls_switch_handle, NULL, value, NULL))
 658                printk(ASUS_WARNING "Error setting light sensor switch\n");
 659        hotk->light_switch = value;
 660}
 661
 662static ssize_t show_lssw(struct device *dev,
 663                         struct device_attribute *attr, char *buf)
 664{
 665        return sprintf(buf, "%d\n", hotk->light_switch);
 666}
 667
 668static ssize_t store_lssw(struct device *dev, struct device_attribute *attr,
 669                          const char *buf, size_t count)
 670{
 671        int rv, value;
 672
 673        rv = parse_arg(buf, count, &value);
 674        if (rv > 0)
 675                set_light_sens_switch(value ? 1 : 0);
 676
 677        return rv;
 678}
 679
 680static void set_light_sens_level(int value)
 681{
 682        if (write_acpi_int(ls_level_handle, NULL, value, NULL))
 683                printk(ASUS_WARNING "Error setting light sensor level\n");
 684        hotk->light_level = value;
 685}
 686
 687static ssize_t show_lslvl(struct device *dev,
 688                          struct device_attribute *attr, char *buf)
 689{
 690        return sprintf(buf, "%d\n", hotk->light_level);
 691}
 692
 693static ssize_t store_lslvl(struct device *dev, struct device_attribute *attr,
 694                           const char *buf, size_t count)
 695{
 696        int rv, value;
 697
 698        rv = parse_arg(buf, count, &value);
 699        if (rv > 0) {
 700                value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
 701                /* 0 <= value <= 15 */
 702                set_light_sens_level(value);
 703        }
 704
 705        return rv;
 706}
 707
 708/*
 709 * GPS
 710 */
 711static ssize_t show_gps(struct device *dev,
 712                        struct device_attribute *attr, char *buf)
 713{
 714        return sprintf(buf, "%d\n", read_status(GPS_ON));
 715}
 716
 717static ssize_t store_gps(struct device *dev, struct device_attribute *attr,
 718                         const char *buf, size_t count)
 719{
 720        return store_status(buf, count, NULL, GPS_ON);
 721}
 722
 723static void asus_hotk_notify(acpi_handle handle, u32 event, void *data)
 724{
 725        /* TODO Find a better way to handle events count. */
 726        if (!hotk)
 727                return;
 728
 729        /*
 730         * We need to tell the backlight device when the backlight power is
 731         * switched
 732         */
 733        if (event == ATKD_LCD_ON) {
 734                write_status(NULL, 1, LCD_ON);
 735                lcd_blank(FB_BLANK_UNBLANK);
 736        } else if (event == ATKD_LCD_OFF) {
 737                write_status(NULL, 0, LCD_ON);
 738                lcd_blank(FB_BLANK_POWERDOWN);
 739        }
 740
 741        acpi_bus_generate_proc_event(hotk->device, event,
 742                                hotk->event_count[event % 128]++);
 743
 744        return;
 745}
 746
 747#define ASUS_CREATE_DEVICE_ATTR(_name)                                  \
 748        struct device_attribute dev_attr_##_name = {                    \
 749                .attr = {                                               \
 750                        .name = __stringify(_name),                     \
 751                        .mode = 0 },                                    \
 752                .show   = NULL,                                         \
 753                .store  = NULL,                                         \
 754        }
 755
 756#define ASUS_SET_DEVICE_ATTR(_name, _mode, _show, _store)               \
 757        do {                                                            \
 758                dev_attr_##_name.attr.mode = _mode;                     \
 759                dev_attr_##_name.show = _show;                          \
 760                dev_attr_##_name.store = _store;                        \
 761        } while(0)
 762
 763static ASUS_CREATE_DEVICE_ATTR(infos);
 764static ASUS_CREATE_DEVICE_ATTR(wlan);
 765static ASUS_CREATE_DEVICE_ATTR(bluetooth);
 766static ASUS_CREATE_DEVICE_ATTR(display);
 767static ASUS_CREATE_DEVICE_ATTR(ledd);
 768static ASUS_CREATE_DEVICE_ATTR(ls_switch);
 769static ASUS_CREATE_DEVICE_ATTR(ls_level);
 770static ASUS_CREATE_DEVICE_ATTR(gps);
 771
 772static struct attribute *asuspf_attributes[] = {
 773        &dev_attr_infos.attr,
 774        &dev_attr_wlan.attr,
 775        &dev_attr_bluetooth.attr,
 776        &dev_attr_display.attr,
 777        &dev_attr_ledd.attr,
 778        &dev_attr_ls_switch.attr,
 779        &dev_attr_ls_level.attr,
 780        &dev_attr_gps.attr,
 781        NULL
 782};
 783
 784static struct attribute_group asuspf_attribute_group = {
 785        .attrs = asuspf_attributes
 786};
 787
 788static struct platform_driver asuspf_driver = {
 789        .driver = {
 790                   .name = ASUS_HOTK_FILE,
 791                   .owner = THIS_MODULE,
 792                   }
 793};
 794
 795static struct platform_device *asuspf_device;
 796
 797static void asus_hotk_add_fs(void)
 798{
 799        ASUS_SET_DEVICE_ATTR(infos, 0444, show_infos, NULL);
 800
 801        if (wl_switch_handle)
 802                ASUS_SET_DEVICE_ATTR(wlan, 0644, show_wlan, store_wlan);
 803
 804        if (bt_switch_handle)
 805                ASUS_SET_DEVICE_ATTR(bluetooth, 0644,
 806                                     show_bluetooth, store_bluetooth);
 807
 808        if (display_set_handle && display_get_handle)
 809                ASUS_SET_DEVICE_ATTR(display, 0644, show_disp, store_disp);
 810        else if (display_set_handle)
 811                ASUS_SET_DEVICE_ATTR(display, 0200, NULL, store_disp);
 812
 813        if (ledd_set_handle)
 814                ASUS_SET_DEVICE_ATTR(ledd, 0644, show_ledd, store_ledd);
 815
 816        if (ls_switch_handle && ls_level_handle) {
 817                ASUS_SET_DEVICE_ATTR(ls_level, 0644, show_lslvl, store_lslvl);
 818                ASUS_SET_DEVICE_ATTR(ls_switch, 0644, show_lssw, store_lssw);
 819        }
 820
 821        if (gps_status_handle && gps_on_handle && gps_off_handle)
 822                ASUS_SET_DEVICE_ATTR(gps, 0644, show_gps, store_gps);
 823}
 824
 825static int asus_handle_init(char *name, acpi_handle * handle,
 826                            char **paths, int num_paths)
 827{
 828        int i;
 829        acpi_status status;
 830
 831        for (i = 0; i < num_paths; i++) {
 832                status = acpi_get_handle(NULL, paths[i], handle);
 833                if (ACPI_SUCCESS(status))
 834                        return 0;
 835        }
 836
 837        *handle = NULL;
 838        return -ENODEV;
 839}
 840
 841#define ASUS_HANDLE_INIT(object)                                        \
 842        asus_handle_init(#object, &object##_handle, object##_paths,     \
 843                         ARRAY_SIZE(object##_paths))
 844
 845/*
 846 * This function is used to initialize the hotk with right values. In this
 847 * method, we can make all the detection we want, and modify the hotk struct
 848 */
 849static int asus_hotk_get_info(void)
 850{
 851        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 852        union acpi_object *model = NULL;
 853        unsigned long long bsts_result, hwrs_result;
 854        char *string = NULL;
 855        acpi_status status;
 856
 857        /*
 858         * Get DSDT headers early enough to allow for differentiating between
 859         * models, but late enough to allow acpi_bus_register_driver() to fail
 860         * before doing anything ACPI-specific. Should we encounter a machine,
 861         * which needs special handling (i.e. its hotkey device has a different
 862         * HID), this bit will be moved. A global variable asus_info contains
 863         * the DSDT header.
 864         */
 865        status = acpi_get_table(ACPI_SIG_DSDT, 1, &asus_info);
 866        if (ACPI_FAILURE(status))
 867                printk(ASUS_WARNING "Couldn't get the DSDT table header\n");
 868
 869        /* We have to write 0 on init this far for all ASUS models */
 870        if (write_acpi_int(hotk->handle, "INIT", 0, &buffer)) {
 871                printk(ASUS_ERR "Hotkey initialization failed\n");
 872                return -ENODEV;
 873        }
 874
 875        /* This needs to be called for some laptops to init properly */
 876        status =
 877            acpi_evaluate_integer(hotk->handle, "BSTS", NULL, &bsts_result);
 878        if (ACPI_FAILURE(status))
 879                printk(ASUS_WARNING "Error calling BSTS\n");
 880        else if (bsts_result)
 881                printk(ASUS_NOTICE "BSTS called, 0x%02x returned\n",
 882                       (uint) bsts_result);
 883
 884        /* This too ... */
 885        write_acpi_int(hotk->handle, "CWAP", wapf, NULL);
 886
 887        /*
 888         * Try to match the object returned by INIT to the specific model.
 889         * Handle every possible object (or the lack of thereof) the DSDT
 890         * writers might throw at us. When in trouble, we pass NULL to
 891         * asus_model_match() and try something completely different.
 892         */
 893        if (buffer.pointer) {
 894                model = buffer.pointer;
 895                switch (model->type) {
 896                case ACPI_TYPE_STRING:
 897                        string = model->string.pointer;
 898                        break;
 899                case ACPI_TYPE_BUFFER:
 900                        string = model->buffer.pointer;
 901                        break;
 902                default:
 903                        string = "";
 904                        break;
 905                }
 906        }
 907        hotk->name = kstrdup(string, GFP_KERNEL);
 908        if (!hotk->name)
 909                return -ENOMEM;
 910
 911        if (*string)
 912                printk(ASUS_NOTICE "  %s model detected\n", string);
 913
 914        ASUS_HANDLE_INIT(mled_set);
 915        ASUS_HANDLE_INIT(tled_set);
 916        ASUS_HANDLE_INIT(rled_set);
 917        ASUS_HANDLE_INIT(pled_set);
 918        ASUS_HANDLE_INIT(gled_set);
 919
 920        ASUS_HANDLE_INIT(ledd_set);
 921
 922        /*
 923         * The HWRS method return informations about the hardware.
 924         * 0x80 bit is for WLAN, 0x100 for Bluetooth.
 925         * The significance of others is yet to be found.
 926         * If we don't find the method, we assume the device are present.
 927         */
 928        status =
 929            acpi_evaluate_integer(hotk->handle, "HRWS", NULL, &hwrs_result);
 930        if (ACPI_FAILURE(status))
 931                hwrs_result = WL_HWRS | BT_HWRS;
 932
 933        if (hwrs_result & WL_HWRS)
 934                ASUS_HANDLE_INIT(wl_switch);
 935        if (hwrs_result & BT_HWRS)
 936                ASUS_HANDLE_INIT(bt_switch);
 937
 938        ASUS_HANDLE_INIT(wireless_status);
 939
 940        ASUS_HANDLE_INIT(brightness_set);
 941        ASUS_HANDLE_INIT(brightness_get);
 942
 943        ASUS_HANDLE_INIT(lcd_switch);
 944
 945        ASUS_HANDLE_INIT(display_set);
 946        ASUS_HANDLE_INIT(display_get);
 947
 948        /* There is a lot of models with "ALSL", but a few get
 949           a real light sens, so we need to check it. */
 950        if (!ASUS_HANDLE_INIT(ls_switch))
 951                ASUS_HANDLE_INIT(ls_level);
 952
 953        ASUS_HANDLE_INIT(gps_on);
 954        ASUS_HANDLE_INIT(gps_off);
 955        ASUS_HANDLE_INIT(gps_status);
 956
 957        kfree(model);
 958
 959        return AE_OK;
 960}
 961
 962static int asus_hotk_check(void)
 963{
 964        int result = 0;
 965
 966        result = acpi_bus_get_status(hotk->device);
 967        if (result)
 968                return result;
 969
 970        if (hotk->device->status.present) {
 971                result = asus_hotk_get_info();
 972        } else {
 973                printk(ASUS_ERR "Hotkey device not present, aborting\n");
 974                return -EINVAL;
 975        }
 976
 977        return result;
 978}
 979
 980static int asus_hotk_found;
 981
 982static int asus_hotk_add(struct acpi_device *device)
 983{
 984        acpi_status status = AE_OK;
 985        int result;
 986
 987        if (!device)
 988                return -EINVAL;
 989
 990        printk(ASUS_NOTICE "Asus Laptop Support version %s\n",
 991               ASUS_LAPTOP_VERSION);
 992
 993        hotk = kzalloc(sizeof(struct asus_hotk), GFP_KERNEL);
 994        if (!hotk)
 995                return -ENOMEM;
 996
 997        hotk->handle = device->handle;
 998        strcpy(acpi_device_name(device), ASUS_HOTK_DEVICE_NAME);
 999        strcpy(acpi_device_class(device), ASUS_HOTK_CLASS);
1000        device->driver_data = hotk;
1001        hotk->device = device;
1002
1003        result = asus_hotk_check();
1004        if (result)
1005                goto end;
1006
1007        asus_hotk_add_fs();
1008
1009        /*
1010         * We install the handler, it will receive the hotk in parameter, so, we
1011         * could add other data to the hotk struct
1012         */
1013        status = acpi_install_notify_handler(hotk->handle, ACPI_ALL_NOTIFY,
1014                                             asus_hotk_notify, hotk);
1015        if (ACPI_FAILURE(status))
1016                printk(ASUS_ERR "Error installing notify handler\n");
1017
1018        asus_hotk_found = 1;
1019
1020        /* WLED and BLED are on by default */
1021        write_status(bt_switch_handle, 1, BT_ON);
1022        write_status(wl_switch_handle, 1, WL_ON);
1023
1024        /* If the h/w switch is off, we need to check the real status */
1025        write_status(NULL, read_status(BT_ON), BT_ON);
1026        write_status(NULL, read_status(WL_ON), WL_ON);
1027
1028        /* LCD Backlight is on by default */
1029        write_status(NULL, 1, LCD_ON);
1030
1031        /* LED display is off by default */
1032        hotk->ledd_status = 0xFFF;
1033
1034        /* Set initial values of light sensor and level */
1035        hotk->light_switch = 1; /* Default to light sensor disabled */
1036        hotk->light_level = 0;  /* level 5 for sensor sensitivity */
1037
1038        if (ls_switch_handle)
1039                set_light_sens_switch(hotk->light_switch);
1040
1041        if (ls_level_handle)
1042                set_light_sens_level(hotk->light_level);
1043
1044        /* GPS is on by default */
1045        write_status(NULL, 1, GPS_ON);
1046
1047      end:
1048        if (result) {
1049                kfree(hotk->name);
1050                kfree(hotk);
1051        }
1052
1053        return result;
1054}
1055
1056static int asus_hotk_remove(struct acpi_device *device, int type)
1057{
1058        acpi_status status = 0;
1059
1060        if (!device || !acpi_driver_data(device))
1061                return -EINVAL;
1062
1063        status = acpi_remove_notify_handler(hotk->handle, ACPI_ALL_NOTIFY,
1064                                            asus_hotk_notify);
1065        if (ACPI_FAILURE(status))
1066                printk(ASUS_ERR "Error removing notify handler\n");
1067
1068        kfree(hotk->name);
1069        kfree(hotk);
1070
1071        return 0;
1072}
1073
1074static void asus_backlight_exit(void)
1075{
1076        if (asus_backlight_device)
1077                backlight_device_unregister(asus_backlight_device);
1078}
1079
1080#define  ASUS_LED_UNREGISTER(object)                            \
1081        if (object##_led.dev)                                   \
1082                led_classdev_unregister(&object##_led)
1083
1084static void asus_led_exit(void)
1085{
1086        destroy_workqueue(led_workqueue);
1087        ASUS_LED_UNREGISTER(mled);
1088        ASUS_LED_UNREGISTER(tled);
1089        ASUS_LED_UNREGISTER(pled);
1090        ASUS_LED_UNREGISTER(rled);
1091        ASUS_LED_UNREGISTER(gled);
1092}
1093
1094static void __exit asus_laptop_exit(void)
1095{
1096        asus_backlight_exit();
1097        asus_led_exit();
1098
1099        acpi_bus_unregister_driver(&asus_hotk_driver);
1100        sysfs_remove_group(&asuspf_device->dev.kobj, &asuspf_attribute_group);
1101        platform_device_unregister(asuspf_device);
1102        platform_driver_unregister(&asuspf_driver);
1103}
1104
1105static int asus_backlight_init(struct device *dev)
1106{
1107        struct backlight_device *bd;
1108
1109        if (brightness_set_handle && lcd_switch_handle) {
1110                bd = backlight_device_register(ASUS_HOTK_FILE, dev,
1111                                               NULL, &asusbl_ops);
1112                if (IS_ERR(bd)) {
1113                        printk(ASUS_ERR
1114                               "Could not register asus backlight device\n");
1115                        asus_backlight_device = NULL;
1116                        return PTR_ERR(bd);
1117                }
1118
1119                asus_backlight_device = bd;
1120
1121                bd->props.max_brightness = 15;
1122                bd->props.brightness = read_brightness(NULL);
1123                bd->props.power = FB_BLANK_UNBLANK;
1124                backlight_update_status(bd);
1125        }
1126        return 0;
1127}
1128
1129static int asus_led_register(acpi_handle handle,
1130                             struct led_classdev *ldev, struct device *dev)
1131{
1132        if (!handle)
1133                return 0;
1134
1135        return led_classdev_register(dev, ldev);
1136}
1137
1138#define ASUS_LED_REGISTER(object, device)                               \
1139        asus_led_register(object##_set_handle, &object##_led, device)
1140
1141static int asus_led_init(struct device *dev)
1142{
1143        int rv;
1144
1145        rv = ASUS_LED_REGISTER(mled, dev);
1146        if (rv)
1147                goto out;
1148
1149        rv = ASUS_LED_REGISTER(tled, dev);
1150        if (rv)
1151                goto out1;
1152
1153        rv = ASUS_LED_REGISTER(rled, dev);
1154        if (rv)
1155                goto out2;
1156
1157        rv = ASUS_LED_REGISTER(pled, dev);
1158        if (rv)
1159                goto out3;
1160
1161        rv = ASUS_LED_REGISTER(gled, dev);
1162        if (rv)
1163                goto out4;
1164
1165        led_workqueue = create_singlethread_workqueue("led_workqueue");
1166        if (!led_workqueue)
1167                goto out5;
1168
1169        return 0;
1170out5:
1171        rv = -ENOMEM;
1172        ASUS_LED_UNREGISTER(gled);
1173out4:
1174        ASUS_LED_UNREGISTER(pled);
1175out3:
1176        ASUS_LED_UNREGISTER(rled);
1177out2:
1178        ASUS_LED_UNREGISTER(tled);
1179out1:
1180        ASUS_LED_UNREGISTER(mled);
1181out:
1182        return rv;
1183}
1184
1185static int __init asus_laptop_init(void)
1186{
1187        struct device *dev;
1188        int result;
1189
1190        if (acpi_disabled)
1191                return -ENODEV;
1192
1193        result = acpi_bus_register_driver(&asus_hotk_driver);
1194        if (result < 0)
1195                return result;
1196
1197        /*
1198         * This is a bit of a kludge.  We only want this module loaded
1199         * for ASUS systems, but there's currently no way to probe the
1200         * ACPI namespace for ASUS HIDs.  So we just return failure if
1201         * we didn't find one, which will cause the module to be
1202         * unloaded.
1203         */
1204        if (!asus_hotk_found) {
1205                acpi_bus_unregister_driver(&asus_hotk_driver);
1206                return -ENODEV;
1207        }
1208
1209        dev = acpi_get_physical_device(hotk->device->handle);
1210
1211        if (!acpi_video_backlight_support()) {
1212                result = asus_backlight_init(dev);
1213                if (result)
1214                        goto fail_backlight;
1215        } else
1216                printk(ASUS_INFO "Brightness ignored, must be controlled by "
1217                       "ACPI video driver\n");
1218
1219        result = asus_led_init(dev);
1220        if (result)
1221                goto fail_led;
1222
1223        /* Register platform stuff */
1224        result = platform_driver_register(&asuspf_driver);
1225        if (result)
1226                goto fail_platform_driver;
1227
1228        asuspf_device = platform_device_alloc(ASUS_HOTK_FILE, -1);
1229        if (!asuspf_device) {
1230                result = -ENOMEM;
1231                goto fail_platform_device1;
1232        }
1233
1234        result = platform_device_add(asuspf_device);
1235        if (result)
1236                goto fail_platform_device2;
1237
1238        result = sysfs_create_group(&asuspf_device->dev.kobj,
1239                                    &asuspf_attribute_group);
1240        if (result)
1241                goto fail_sysfs;
1242
1243        return 0;
1244
1245      fail_sysfs:
1246        platform_device_del(asuspf_device);
1247
1248      fail_platform_device2:
1249        platform_device_put(asuspf_device);
1250
1251      fail_platform_device1:
1252        platform_driver_unregister(&asuspf_driver);
1253
1254      fail_platform_driver:
1255        asus_led_exit();
1256
1257      fail_led:
1258        asus_backlight_exit();
1259
1260      fail_backlight:
1261
1262        return result;
1263}
1264
1265module_init(asus_laptop_init);
1266module_exit(asus_laptop_exit);
1267