linux/drivers/misc/eeepc-laptop.c
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   1/*
   2 *  eepc-laptop.c - Asus Eee PC extras
   3 *
   4 *  Based on asus_acpi.c as patched for the Eee PC by Asus:
   5 *  ftp://ftp.asus.com/pub/ASUS/EeePC/701/ASUS_ACPI_071126.rar
   6 *  Based on eee.c from eeepc-linux
   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
  19#include <linux/kernel.h>
  20#include <linux/module.h>
  21#include <linux/init.h>
  22#include <linux/types.h>
  23#include <linux/platform_device.h>
  24#include <linux/backlight.h>
  25#include <linux/fb.h>
  26#include <linux/hwmon.h>
  27#include <linux/hwmon-sysfs.h>
  28#include <acpi/acpi_drivers.h>
  29#include <acpi/acpi_bus.h>
  30#include <linux/uaccess.h>
  31#include <linux/input.h>
  32#include <linux/rfkill.h>
  33
  34#define EEEPC_LAPTOP_VERSION    "0.1"
  35
  36#define EEEPC_HOTK_NAME         "Eee PC Hotkey Driver"
  37#define EEEPC_HOTK_FILE         "eeepc"
  38#define EEEPC_HOTK_CLASS        "hotkey"
  39#define EEEPC_HOTK_DEVICE_NAME  "Hotkey"
  40#define EEEPC_HOTK_HID          "ASUS010"
  41
  42#define EEEPC_LOG       EEEPC_HOTK_FILE ": "
  43#define EEEPC_ERR       KERN_ERR        EEEPC_LOG
  44#define EEEPC_WARNING   KERN_WARNING    EEEPC_LOG
  45#define EEEPC_NOTICE    KERN_NOTICE     EEEPC_LOG
  46#define EEEPC_INFO      KERN_INFO       EEEPC_LOG
  47
  48/*
  49 * Definitions for Asus EeePC
  50 */
  51#define NOTIFY_WLAN_ON  0x10
  52#define NOTIFY_BRN_MIN  0x20
  53#define NOTIFY_BRN_MAX  0x2f
  54
  55enum {
  56        DISABLE_ASL_WLAN = 0x0001,
  57        DISABLE_ASL_BLUETOOTH = 0x0002,
  58        DISABLE_ASL_IRDA = 0x0004,
  59        DISABLE_ASL_CAMERA = 0x0008,
  60        DISABLE_ASL_TV = 0x0010,
  61        DISABLE_ASL_GPS = 0x0020,
  62        DISABLE_ASL_DISPLAYSWITCH = 0x0040,
  63        DISABLE_ASL_MODEM = 0x0080,
  64        DISABLE_ASL_CARDREADER = 0x0100
  65};
  66
  67enum {
  68        CM_ASL_WLAN = 0,
  69        CM_ASL_BLUETOOTH,
  70        CM_ASL_IRDA,
  71        CM_ASL_1394,
  72        CM_ASL_CAMERA,
  73        CM_ASL_TV,
  74        CM_ASL_GPS,
  75        CM_ASL_DVDROM,
  76        CM_ASL_DISPLAYSWITCH,
  77        CM_ASL_PANELBRIGHT,
  78        CM_ASL_BIOSFLASH,
  79        CM_ASL_ACPIFLASH,
  80        CM_ASL_CPUFV,
  81        CM_ASL_CPUTEMPERATURE,
  82        CM_ASL_FANCPU,
  83        CM_ASL_FANCHASSIS,
  84        CM_ASL_USBPORT1,
  85        CM_ASL_USBPORT2,
  86        CM_ASL_USBPORT3,
  87        CM_ASL_MODEM,
  88        CM_ASL_CARDREADER,
  89        CM_ASL_LID
  90};
  91
  92static const char *cm_getv[] = {
  93        "WLDG", NULL, NULL, NULL,
  94        "CAMG", NULL, NULL, NULL,
  95        NULL, "PBLG", NULL, NULL,
  96        "CFVG", NULL, NULL, NULL,
  97        "USBG", NULL, NULL, "MODG",
  98        "CRDG", "LIDG"
  99};
 100
 101static const char *cm_setv[] = {
 102        "WLDS", NULL, NULL, NULL,
 103        "CAMS", NULL, NULL, NULL,
 104        "SDSP", "PBLS", "HDPS", NULL,
 105        "CFVS", NULL, NULL, NULL,
 106        "USBG", NULL, NULL, "MODS",
 107        "CRDS", NULL
 108};
 109
 110#define EEEPC_EC        "\\_SB.PCI0.SBRG.EC0."
 111
 112#define EEEPC_EC_FAN_PWM        EEEPC_EC "SC02" /* Fan PWM duty cycle (%) */
 113#define EEEPC_EC_SC02           0x63
 114#define EEEPC_EC_FAN_HRPM       EEEPC_EC "SC05" /* High byte, fan speed (RPM) */
 115#define EEEPC_EC_FAN_LRPM       EEEPC_EC "SC06" /* Low byte, fan speed (RPM) */
 116#define EEEPC_EC_FAN_CTRL       EEEPC_EC "SFB3" /* Byte containing SF25  */
 117#define EEEPC_EC_SFB3           0xD3
 118
 119/*
 120 * This is the main structure, we can use it to store useful information
 121 * about the hotk device
 122 */
 123struct eeepc_hotk {
 124        struct acpi_device *device;     /* the device we are in */
 125        acpi_handle handle;             /* the handle of the hotk device */
 126        u32 cm_supported;               /* the control methods supported
 127                                           by this BIOS */
 128        uint init_flag;                 /* Init flags */
 129        u16 event_count[128];           /* count for each event */
 130        struct input_dev *inputdev;
 131        u16 *keycode_map;
 132        struct rfkill *eeepc_wlan_rfkill;
 133        struct rfkill *eeepc_bluetooth_rfkill;
 134};
 135
 136/* The actual device the driver binds to */
 137static struct eeepc_hotk *ehotk;
 138
 139/* Platform device/driver */
 140static struct platform_driver platform_driver = {
 141        .driver = {
 142                .name = EEEPC_HOTK_FILE,
 143                .owner = THIS_MODULE,
 144        }
 145};
 146
 147static struct platform_device *platform_device;
 148
 149struct key_entry {
 150        char type;
 151        u8 code;
 152        u16 keycode;
 153};
 154
 155enum { KE_KEY, KE_END };
 156
 157static struct key_entry eeepc_keymap[] = {
 158        /* Sleep already handled via generic ACPI code */
 159        {KE_KEY, 0x10, KEY_WLAN },
 160        {KE_KEY, 0x12, KEY_PROG1 },
 161        {KE_KEY, 0x13, KEY_MUTE },
 162        {KE_KEY, 0x14, KEY_VOLUMEDOWN },
 163        {KE_KEY, 0x15, KEY_VOLUMEUP },
 164        {KE_KEY, 0x30, KEY_SWITCHVIDEOMODE },
 165        {KE_KEY, 0x31, KEY_SWITCHVIDEOMODE },
 166        {KE_KEY, 0x32, KEY_SWITCHVIDEOMODE },
 167        {KE_END, 0},
 168};
 169
 170/*
 171 * The hotkey driver declaration
 172 */
 173static int eeepc_hotk_add(struct acpi_device *device);
 174static int eeepc_hotk_remove(struct acpi_device *device, int type);
 175
 176static const struct acpi_device_id eeepc_device_ids[] = {
 177        {EEEPC_HOTK_HID, 0},
 178        {"", 0},
 179};
 180MODULE_DEVICE_TABLE(acpi, eeepc_device_ids);
 181
 182static struct acpi_driver eeepc_hotk_driver = {
 183        .name = EEEPC_HOTK_NAME,
 184        .class = EEEPC_HOTK_CLASS,
 185        .ids = eeepc_device_ids,
 186        .ops = {
 187                .add = eeepc_hotk_add,
 188                .remove = eeepc_hotk_remove,
 189        },
 190};
 191
 192/* The backlight device /sys/class/backlight */
 193static struct backlight_device *eeepc_backlight_device;
 194
 195/* The hwmon device */
 196static struct device *eeepc_hwmon_device;
 197
 198/*
 199 * The backlight class declaration
 200 */
 201static int read_brightness(struct backlight_device *bd);
 202static int update_bl_status(struct backlight_device *bd);
 203static struct backlight_ops eeepcbl_ops = {
 204        .get_brightness = read_brightness,
 205        .update_status = update_bl_status,
 206};
 207
 208MODULE_AUTHOR("Corentin Chary, Eric Cooper");
 209MODULE_DESCRIPTION(EEEPC_HOTK_NAME);
 210MODULE_LICENSE("GPL");
 211
 212/*
 213 * ACPI Helpers
 214 */
 215static int write_acpi_int(acpi_handle handle, const char *method, int val,
 216                          struct acpi_buffer *output)
 217{
 218        struct acpi_object_list params;
 219        union acpi_object in_obj;
 220        acpi_status status;
 221
 222        params.count = 1;
 223        params.pointer = &in_obj;
 224        in_obj.type = ACPI_TYPE_INTEGER;
 225        in_obj.integer.value = val;
 226
 227        status = acpi_evaluate_object(handle, (char *)method, &params, output);
 228        return (status == AE_OK ? 0 : -1);
 229}
 230
 231static int read_acpi_int(acpi_handle handle, const char *method, int *val)
 232{
 233        acpi_status status;
 234        unsigned long long result;
 235
 236        status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
 237        if (ACPI_FAILURE(status)) {
 238                *val = -1;
 239                return -1;
 240        } else {
 241                *val = result;
 242                return 0;
 243        }
 244}
 245
 246static int set_acpi(int cm, int value)
 247{
 248        if (ehotk->cm_supported & (0x1 << cm)) {
 249                const char *method = cm_setv[cm];
 250                if (method == NULL)
 251                        return -ENODEV;
 252                if (write_acpi_int(ehotk->handle, method, value, NULL))
 253                        printk(EEEPC_WARNING "Error writing %s\n", method);
 254        }
 255        return 0;
 256}
 257
 258static int get_acpi(int cm)
 259{
 260        int value = -1;
 261        if ((ehotk->cm_supported & (0x1 << cm))) {
 262                const char *method = cm_getv[cm];
 263                if (method == NULL)
 264                        return -ENODEV;
 265                if (read_acpi_int(ehotk->handle, method, &value))
 266                        printk(EEEPC_WARNING "Error reading %s\n", method);
 267        }
 268        return value;
 269}
 270
 271/*
 272 * Backlight
 273 */
 274static int read_brightness(struct backlight_device *bd)
 275{
 276        return get_acpi(CM_ASL_PANELBRIGHT);
 277}
 278
 279static int set_brightness(struct backlight_device *bd, int value)
 280{
 281        value = max(0, min(15, value));
 282        return set_acpi(CM_ASL_PANELBRIGHT, value);
 283}
 284
 285static int update_bl_status(struct backlight_device *bd)
 286{
 287        return set_brightness(bd, bd->props.brightness);
 288}
 289
 290/*
 291 * Rfkill helpers
 292 */
 293
 294static int eeepc_wlan_rfkill_set(void *data, enum rfkill_state state)
 295{
 296        if (state == RFKILL_STATE_SOFT_BLOCKED)
 297                return set_acpi(CM_ASL_WLAN, 0);
 298        else
 299                return set_acpi(CM_ASL_WLAN, 1);
 300}
 301
 302static int eeepc_wlan_rfkill_state(void *data, enum rfkill_state *state)
 303{
 304        if (get_acpi(CM_ASL_WLAN) == 1)
 305                *state = RFKILL_STATE_UNBLOCKED;
 306        else
 307                *state = RFKILL_STATE_SOFT_BLOCKED;
 308        return 0;
 309}
 310
 311static int eeepc_bluetooth_rfkill_set(void *data, enum rfkill_state state)
 312{
 313        if (state == RFKILL_STATE_SOFT_BLOCKED)
 314                return set_acpi(CM_ASL_BLUETOOTH, 0);
 315        else
 316                return set_acpi(CM_ASL_BLUETOOTH, 1);
 317}
 318
 319static int eeepc_bluetooth_rfkill_state(void *data, enum rfkill_state *state)
 320{
 321        if (get_acpi(CM_ASL_BLUETOOTH) == 1)
 322                *state = RFKILL_STATE_UNBLOCKED;
 323        else
 324                *state = RFKILL_STATE_SOFT_BLOCKED;
 325        return 0;
 326}
 327
 328/*
 329 * Sys helpers
 330 */
 331static int parse_arg(const char *buf, unsigned long count, int *val)
 332{
 333        if (!count)
 334                return 0;
 335        if (sscanf(buf, "%i", val) != 1)
 336                return -EINVAL;
 337        return count;
 338}
 339
 340static ssize_t store_sys_acpi(int cm, const char *buf, size_t count)
 341{
 342        int rv, value;
 343
 344        rv = parse_arg(buf, count, &value);
 345        if (rv > 0)
 346                set_acpi(cm, value);
 347        return rv;
 348}
 349
 350static ssize_t show_sys_acpi(int cm, char *buf)
 351{
 352        return sprintf(buf, "%d\n", get_acpi(cm));
 353}
 354
 355#define EEEPC_CREATE_DEVICE_ATTR(_name, _cm)                            \
 356        static ssize_t show_##_name(struct device *dev,                 \
 357                                    struct device_attribute *attr,      \
 358                                    char *buf)                          \
 359        {                                                               \
 360                return show_sys_acpi(_cm, buf);                         \
 361        }                                                               \
 362        static ssize_t store_##_name(struct device *dev,                \
 363                                     struct device_attribute *attr,     \
 364                                     const char *buf, size_t count)     \
 365        {                                                               \
 366                return store_sys_acpi(_cm, buf, count);                 \
 367        }                                                               \
 368        static struct device_attribute dev_attr_##_name = {             \
 369                .attr = {                                               \
 370                        .name = __stringify(_name),                     \
 371                        .mode = 0644 },                                 \
 372                .show   = show_##_name,                                 \
 373                .store  = store_##_name,                                \
 374        }
 375
 376EEEPC_CREATE_DEVICE_ATTR(camera, CM_ASL_CAMERA);
 377EEEPC_CREATE_DEVICE_ATTR(cardr, CM_ASL_CARDREADER);
 378EEEPC_CREATE_DEVICE_ATTR(disp, CM_ASL_DISPLAYSWITCH);
 379
 380static struct attribute *platform_attributes[] = {
 381        &dev_attr_camera.attr,
 382        &dev_attr_cardr.attr,
 383        &dev_attr_disp.attr,
 384        NULL
 385};
 386
 387static struct attribute_group platform_attribute_group = {
 388        .attrs = platform_attributes
 389};
 390
 391/*
 392 * Hotkey functions
 393 */
 394static struct key_entry *eepc_get_entry_by_scancode(int code)
 395{
 396        struct key_entry *key;
 397
 398        for (key = eeepc_keymap; key->type != KE_END; key++)
 399                if (code == key->code)
 400                        return key;
 401
 402        return NULL;
 403}
 404
 405static struct key_entry *eepc_get_entry_by_keycode(int code)
 406{
 407        struct key_entry *key;
 408
 409        for (key = eeepc_keymap; key->type != KE_END; key++)
 410                if (code == key->keycode && key->type == KE_KEY)
 411                        return key;
 412
 413        return NULL;
 414}
 415
 416static int eeepc_getkeycode(struct input_dev *dev, int scancode, int *keycode)
 417{
 418        struct key_entry *key = eepc_get_entry_by_scancode(scancode);
 419
 420        if (key && key->type == KE_KEY) {
 421                *keycode = key->keycode;
 422                return 0;
 423        }
 424
 425        return -EINVAL;
 426}
 427
 428static int eeepc_setkeycode(struct input_dev *dev, int scancode, int keycode)
 429{
 430        struct key_entry *key;
 431        int old_keycode;
 432
 433        if (keycode < 0 || keycode > KEY_MAX)
 434                return -EINVAL;
 435
 436        key = eepc_get_entry_by_scancode(scancode);
 437        if (key && key->type == KE_KEY) {
 438                old_keycode = key->keycode;
 439                key->keycode = keycode;
 440                set_bit(keycode, dev->keybit);
 441                if (!eepc_get_entry_by_keycode(old_keycode))
 442                        clear_bit(old_keycode, dev->keybit);
 443                return 0;
 444        }
 445
 446        return -EINVAL;
 447}
 448
 449static int eeepc_hotk_check(void)
 450{
 451        const struct key_entry *key;
 452        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 453        int result;
 454
 455        result = acpi_bus_get_status(ehotk->device);
 456        if (result)
 457                return result;
 458        if (ehotk->device->status.present) {
 459                if (write_acpi_int(ehotk->handle, "INIT", ehotk->init_flag,
 460                                    &buffer)) {
 461                        printk(EEEPC_ERR "Hotkey initialization failed\n");
 462                        return -ENODEV;
 463                } else {
 464                        printk(EEEPC_NOTICE "Hotkey init flags 0x%x\n",
 465                               ehotk->init_flag);
 466                }
 467                /* get control methods supported */
 468                if (read_acpi_int(ehotk->handle, "CMSG"
 469                                   , &ehotk->cm_supported)) {
 470                        printk(EEEPC_ERR
 471                               "Get control methods supported failed\n");
 472                        return -ENODEV;
 473                } else {
 474                        printk(EEEPC_INFO
 475                               "Get control methods supported: 0x%x\n",
 476                               ehotk->cm_supported);
 477                }
 478                ehotk->inputdev = input_allocate_device();
 479                if (!ehotk->inputdev) {
 480                        printk(EEEPC_INFO "Unable to allocate input device\n");
 481                        return 0;
 482                }
 483                ehotk->inputdev->name = "Asus EeePC extra buttons";
 484                ehotk->inputdev->phys = EEEPC_HOTK_FILE "/input0";
 485                ehotk->inputdev->id.bustype = BUS_HOST;
 486                ehotk->inputdev->getkeycode = eeepc_getkeycode;
 487                ehotk->inputdev->setkeycode = eeepc_setkeycode;
 488
 489                for (key = eeepc_keymap; key->type != KE_END; key++) {
 490                        switch (key->type) {
 491                        case KE_KEY:
 492                                set_bit(EV_KEY, ehotk->inputdev->evbit);
 493                                set_bit(key->keycode, ehotk->inputdev->keybit);
 494                                break;
 495                        }
 496                }
 497                result = input_register_device(ehotk->inputdev);
 498                if (result) {
 499                        printk(EEEPC_INFO "Unable to register input device\n");
 500                        input_free_device(ehotk->inputdev);
 501                        return 0;
 502                }
 503        } else {
 504                printk(EEEPC_ERR "Hotkey device not present, aborting\n");
 505                return -EINVAL;
 506        }
 507        return 0;
 508}
 509
 510static void notify_brn(void)
 511{
 512        struct backlight_device *bd = eeepc_backlight_device;
 513        bd->props.brightness = read_brightness(bd);
 514}
 515
 516static void eeepc_hotk_notify(acpi_handle handle, u32 event, void *data)
 517{
 518        static struct key_entry *key;
 519        if (!ehotk)
 520                return;
 521        if (event >= NOTIFY_BRN_MIN && event <= NOTIFY_BRN_MAX)
 522                notify_brn();
 523        acpi_bus_generate_proc_event(ehotk->device, event,
 524                                     ehotk->event_count[event % 128]++);
 525        if (ehotk->inputdev) {
 526                key = eepc_get_entry_by_scancode(event);
 527                if (key) {
 528                        switch (key->type) {
 529                        case KE_KEY:
 530                                input_report_key(ehotk->inputdev, key->keycode,
 531                                                 1);
 532                                input_sync(ehotk->inputdev);
 533                                input_report_key(ehotk->inputdev, key->keycode,
 534                                                 0);
 535                                input_sync(ehotk->inputdev);
 536                                break;
 537                        }
 538                }
 539        }
 540}
 541
 542static int eeepc_hotk_add(struct acpi_device *device)
 543{
 544        acpi_status status = AE_OK;
 545        int result;
 546
 547        if (!device)
 548                 return -EINVAL;
 549        printk(EEEPC_NOTICE EEEPC_HOTK_NAME "\n");
 550        ehotk = kzalloc(sizeof(struct eeepc_hotk), GFP_KERNEL);
 551        if (!ehotk)
 552                return -ENOMEM;
 553        ehotk->init_flag = DISABLE_ASL_WLAN | DISABLE_ASL_DISPLAYSWITCH;
 554        ehotk->handle = device->handle;
 555        strcpy(acpi_device_name(device), EEEPC_HOTK_DEVICE_NAME);
 556        strcpy(acpi_device_class(device), EEEPC_HOTK_CLASS);
 557        device->driver_data = ehotk;
 558        ehotk->device = device;
 559        result = eeepc_hotk_check();
 560        if (result)
 561                goto end;
 562        status = acpi_install_notify_handler(ehotk->handle, ACPI_SYSTEM_NOTIFY,
 563                                             eeepc_hotk_notify, ehotk);
 564        if (ACPI_FAILURE(status))
 565                printk(EEEPC_ERR "Error installing notify handler\n");
 566
 567        if (get_acpi(CM_ASL_WLAN) != -1) {
 568                ehotk->eeepc_wlan_rfkill = rfkill_allocate(&device->dev,
 569                                                           RFKILL_TYPE_WLAN);
 570
 571                if (!ehotk->eeepc_wlan_rfkill)
 572                        goto end;
 573
 574                ehotk->eeepc_wlan_rfkill->name = "eeepc-wlan";
 575                ehotk->eeepc_wlan_rfkill->toggle_radio = eeepc_wlan_rfkill_set;
 576                ehotk->eeepc_wlan_rfkill->get_state = eeepc_wlan_rfkill_state;
 577                if (get_acpi(CM_ASL_WLAN) == 1)
 578                        ehotk->eeepc_wlan_rfkill->state =
 579                                RFKILL_STATE_UNBLOCKED;
 580                else
 581                        ehotk->eeepc_wlan_rfkill->state =
 582                                RFKILL_STATE_SOFT_BLOCKED;
 583                rfkill_register(ehotk->eeepc_wlan_rfkill);
 584        }
 585
 586        if (get_acpi(CM_ASL_BLUETOOTH) != -1) {
 587                ehotk->eeepc_bluetooth_rfkill =
 588                        rfkill_allocate(&device->dev, RFKILL_TYPE_BLUETOOTH);
 589
 590                if (!ehotk->eeepc_bluetooth_rfkill)
 591                        goto end;
 592
 593                ehotk->eeepc_bluetooth_rfkill->name = "eeepc-bluetooth";
 594                ehotk->eeepc_bluetooth_rfkill->toggle_radio =
 595                        eeepc_bluetooth_rfkill_set;
 596                ehotk->eeepc_bluetooth_rfkill->get_state =
 597                        eeepc_bluetooth_rfkill_state;
 598                if (get_acpi(CM_ASL_BLUETOOTH) == 1)
 599                        ehotk->eeepc_bluetooth_rfkill->state =
 600                                RFKILL_STATE_UNBLOCKED;
 601                else
 602                        ehotk->eeepc_bluetooth_rfkill->state =
 603                                RFKILL_STATE_SOFT_BLOCKED;
 604                rfkill_register(ehotk->eeepc_bluetooth_rfkill);
 605        }
 606
 607 end:
 608        if (result) {
 609                kfree(ehotk);
 610                ehotk = NULL;
 611        }
 612        return result;
 613}
 614
 615static int eeepc_hotk_remove(struct acpi_device *device, int type)
 616{
 617        acpi_status status = 0;
 618
 619        if (!device || !acpi_driver_data(device))
 620                 return -EINVAL;
 621        status = acpi_remove_notify_handler(ehotk->handle, ACPI_SYSTEM_NOTIFY,
 622                                            eeepc_hotk_notify);
 623        if (ACPI_FAILURE(status))
 624                printk(EEEPC_ERR "Error removing notify handler\n");
 625        kfree(ehotk);
 626        return 0;
 627}
 628
 629/*
 630 * Hwmon
 631 */
 632static int eeepc_get_fan_pwm(void)
 633{
 634        int value = 0;
 635
 636        read_acpi_int(NULL, EEEPC_EC_FAN_PWM, &value);
 637        value = value * 255 / 100;
 638        return (value);
 639}
 640
 641static void eeepc_set_fan_pwm(int value)
 642{
 643        value = SENSORS_LIMIT(value, 0, 255);
 644        value = value * 100 / 255;
 645        ec_write(EEEPC_EC_SC02, value);
 646}
 647
 648static int eeepc_get_fan_rpm(void)
 649{
 650        int high = 0;
 651        int low = 0;
 652
 653        read_acpi_int(NULL, EEEPC_EC_FAN_HRPM, &high);
 654        read_acpi_int(NULL, EEEPC_EC_FAN_LRPM, &low);
 655        return (high << 8 | low);
 656}
 657
 658static int eeepc_get_fan_ctrl(void)
 659{
 660        int value = 0;
 661
 662        read_acpi_int(NULL, EEEPC_EC_FAN_CTRL, &value);
 663        return ((value & 0x02 ? 1 : 0));
 664}
 665
 666static void eeepc_set_fan_ctrl(int manual)
 667{
 668        int value = 0;
 669
 670        read_acpi_int(NULL, EEEPC_EC_FAN_CTRL, &value);
 671        if (manual)
 672                value |= 0x02;
 673        else
 674                value &= ~0x02;
 675        ec_write(EEEPC_EC_SFB3, value);
 676}
 677
 678static ssize_t store_sys_hwmon(void (*set)(int), const char *buf, size_t count)
 679{
 680        int rv, value;
 681
 682        rv = parse_arg(buf, count, &value);
 683        if (rv > 0)
 684                set(value);
 685        return rv;
 686}
 687
 688static ssize_t show_sys_hwmon(int (*get)(void), char *buf)
 689{
 690        return sprintf(buf, "%d\n", get());
 691}
 692
 693#define EEEPC_CREATE_SENSOR_ATTR(_name, _mode, _set, _get)              \
 694        static ssize_t show_##_name(struct device *dev,                 \
 695                                    struct device_attribute *attr,      \
 696                                    char *buf)                          \
 697        {                                                               \
 698                return show_sys_hwmon(_set, buf);                       \
 699        }                                                               \
 700        static ssize_t store_##_name(struct device *dev,                \
 701                                     struct device_attribute *attr,     \
 702                                     const char *buf, size_t count)     \
 703        {                                                               \
 704                return store_sys_hwmon(_get, buf, count);               \
 705        }                                                               \
 706        static SENSOR_DEVICE_ATTR(_name, _mode, show_##_name, store_##_name, 0);
 707
 708EEEPC_CREATE_SENSOR_ATTR(fan1_input, S_IRUGO, eeepc_get_fan_rpm, NULL);
 709EEEPC_CREATE_SENSOR_ATTR(pwm1, S_IRUGO | S_IWUSR,
 710                         eeepc_get_fan_pwm, eeepc_set_fan_pwm);
 711EEEPC_CREATE_SENSOR_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
 712                         eeepc_get_fan_ctrl, eeepc_set_fan_ctrl);
 713
 714static ssize_t
 715show_name(struct device *dev, struct device_attribute *attr, char *buf)
 716{
 717        return sprintf(buf, "eeepc\n");
 718}
 719static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
 720
 721static struct attribute *hwmon_attributes[] = {
 722        &sensor_dev_attr_pwm1.dev_attr.attr,
 723        &sensor_dev_attr_fan1_input.dev_attr.attr,
 724        &sensor_dev_attr_pwm1_enable.dev_attr.attr,
 725        &sensor_dev_attr_name.dev_attr.attr,
 726        NULL
 727};
 728
 729static struct attribute_group hwmon_attribute_group = {
 730        .attrs = hwmon_attributes
 731};
 732
 733/*
 734 * exit/init
 735 */
 736static void eeepc_backlight_exit(void)
 737{
 738        if (eeepc_backlight_device)
 739                backlight_device_unregister(eeepc_backlight_device);
 740        if (ehotk->inputdev)
 741                input_unregister_device(ehotk->inputdev);
 742        if (ehotk->eeepc_wlan_rfkill)
 743                rfkill_unregister(ehotk->eeepc_wlan_rfkill);
 744        if (ehotk->eeepc_bluetooth_rfkill)
 745                rfkill_unregister(ehotk->eeepc_bluetooth_rfkill);
 746        eeepc_backlight_device = NULL;
 747}
 748
 749static void eeepc_hwmon_exit(void)
 750{
 751        struct device *hwmon;
 752
 753        hwmon = eeepc_hwmon_device;
 754        if (!hwmon)
 755                return ;
 756        sysfs_remove_group(&hwmon->kobj,
 757                           &hwmon_attribute_group);
 758        hwmon_device_unregister(hwmon);
 759        eeepc_hwmon_device = NULL;
 760}
 761
 762static void __exit eeepc_laptop_exit(void)
 763{
 764        eeepc_backlight_exit();
 765        eeepc_hwmon_exit();
 766        acpi_bus_unregister_driver(&eeepc_hotk_driver);
 767        sysfs_remove_group(&platform_device->dev.kobj,
 768                           &platform_attribute_group);
 769        platform_device_unregister(platform_device);
 770        platform_driver_unregister(&platform_driver);
 771}
 772
 773static int eeepc_backlight_init(struct device *dev)
 774{
 775        struct backlight_device *bd;
 776
 777        bd = backlight_device_register(EEEPC_HOTK_FILE, dev,
 778                                       NULL, &eeepcbl_ops);
 779        if (IS_ERR(bd)) {
 780                printk(EEEPC_ERR
 781                       "Could not register eeepc backlight device\n");
 782                eeepc_backlight_device = NULL;
 783                return PTR_ERR(bd);
 784        }
 785        eeepc_backlight_device = bd;
 786        bd->props.max_brightness = 15;
 787        bd->props.brightness = read_brightness(NULL);
 788        bd->props.power = FB_BLANK_UNBLANK;
 789        backlight_update_status(bd);
 790        return 0;
 791}
 792
 793static int eeepc_hwmon_init(struct device *dev)
 794{
 795        struct device *hwmon;
 796        int result;
 797
 798        hwmon = hwmon_device_register(dev);
 799        if (IS_ERR(hwmon)) {
 800                printk(EEEPC_ERR
 801                       "Could not register eeepc hwmon device\n");
 802                eeepc_hwmon_device = NULL;
 803                return PTR_ERR(hwmon);
 804        }
 805        eeepc_hwmon_device = hwmon;
 806        result = sysfs_create_group(&hwmon->kobj,
 807                                    &hwmon_attribute_group);
 808        if (result)
 809                eeepc_hwmon_exit();
 810        return result;
 811}
 812
 813static int __init eeepc_laptop_init(void)
 814{
 815        struct device *dev;
 816        int result;
 817
 818        if (acpi_disabled)
 819                return -ENODEV;
 820        result = acpi_bus_register_driver(&eeepc_hotk_driver);
 821        if (result < 0)
 822                return result;
 823        if (!ehotk) {
 824                acpi_bus_unregister_driver(&eeepc_hotk_driver);
 825                return -ENODEV;
 826        }
 827        dev = acpi_get_physical_device(ehotk->device->handle);
 828
 829        if (!acpi_video_backlight_support()) {
 830                result = eeepc_backlight_init(dev);
 831                if (result)
 832                        goto fail_backlight;
 833        } else
 834                printk(EEEPC_INFO "Backlight controlled by ACPI video "
 835                       "driver\n");
 836
 837        result = eeepc_hwmon_init(dev);
 838        if (result)
 839                goto fail_hwmon;
 840        /* Register platform stuff */
 841        result = platform_driver_register(&platform_driver);
 842        if (result)
 843                goto fail_platform_driver;
 844        platform_device = platform_device_alloc(EEEPC_HOTK_FILE, -1);
 845        if (!platform_device) {
 846                result = -ENOMEM;
 847                goto fail_platform_device1;
 848        }
 849        result = platform_device_add(platform_device);
 850        if (result)
 851                goto fail_platform_device2;
 852        result = sysfs_create_group(&platform_device->dev.kobj,
 853                                    &platform_attribute_group);
 854        if (result)
 855                goto fail_sysfs;
 856        return 0;
 857fail_sysfs:
 858        platform_device_del(platform_device);
 859fail_platform_device2:
 860        platform_device_put(platform_device);
 861fail_platform_device1:
 862        platform_driver_unregister(&platform_driver);
 863fail_platform_driver:
 864        eeepc_hwmon_exit();
 865fail_hwmon:
 866        eeepc_backlight_exit();
 867fail_backlight:
 868        return result;
 869}
 870
 871module_init(eeepc_laptop_init);
 872module_exit(eeepc_laptop_exit);
 873