drivers/misc/eeepc-laptop.c

   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
  32 #define EEEPC_LAPTOP_VERSION    "0.1"
  33
  34 #define EEEPC_HOTK_NAME         "Eee PC Hotkey Driver"
  35 #define EEEPC_HOTK_FILE         "eeepc"
  36 #define EEEPC_HOTK_CLASS        "hotkey"
  37 #define EEEPC_HOTK_DEVICE_NAME  "Hotkey"
  38 #define EEEPC_HOTK_HID          "ASUS010"
  39
  40 #define EEEPC_LOG       EEEPC_HOTK_FILE ": "
  41 #define EEEPC_ERR       KERN_ERR        EEEPC_LOG
  42 #define EEEPC_WARNING   KERN_WARNING    EEEPC_LOG
  43 #define EEEPC_NOTICE    KERN_NOTICE     EEEPC_LOG
  44 #define EEEPC_INFO      KERN_INFO       EEEPC_LOG
  45
  46 /*
  47  * Definitions for Asus EeePC
  48  */
  49 #define NOTIFY_WLAN_ON  0x10
  50 #define NOTIFY_BRN_MIN  0x20
  51 #define NOTIFY_BRN_MAX  0x2f
  52
  53 enum {
  54         DISABLE_ASL_WLAN = 0x0001,
  55         DISABLE_ASL_BLUETOOTH = 0x0002,
  56         DISABLE_ASL_IRDA = 0x0004,
  57         DISABLE_ASL_CAMERA = 0x0008,
  58         DISABLE_ASL_TV = 0x0010,
  59         DISABLE_ASL_GPS = 0x0020,
  60         DISABLE_ASL_DISPLAYSWITCH = 0x0040,
  61         DISABLE_ASL_MODEM = 0x0080,
  62         DISABLE_ASL_CARDREADER = 0x0100
  63 };
  64
  65 enum {
  66         CM_ASL_WLAN = 0,
  67         CM_ASL_BLUETOOTH,
  68         CM_ASL_IRDA,
  69         CM_ASL_1394,
  70         CM_ASL_CAMERA,
  71         CM_ASL_TV,
  72         CM_ASL_GPS,
  73         CM_ASL_DVDROM,
  74         CM_ASL_DISPLAYSWITCH,
  75         CM_ASL_PANELBRIGHT,
  76         CM_ASL_BIOSFLASH,
  77         CM_ASL_ACPIFLASH,
  78         CM_ASL_CPUFV,
  79         CM_ASL_CPUTEMPERATURE,
  80         CM_ASL_FANCPU,
  81         CM_ASL_FANCHASSIS,
  82         CM_ASL_USBPORT1,
  83         CM_ASL_USBPORT2,
  84         CM_ASL_USBPORT3,
  85         CM_ASL_MODEM,
  86         CM_ASL_CARDREADER,
  87         CM_ASL_LID
  88 };
  89
  90 static const char *cm_getv[] = {
  91         "WLDG", NULL, NULL, NULL,
  92         "CAMG", NULL, NULL, NULL,
  93         NULL, "PBLG", NULL, NULL,
  94         "CFVG", NULL, NULL, NULL,
  95         "USBG", NULL, NULL, "MODG",
  96         "CRDG", "LIDG"
  97 };
  98
  99 static const char *cm_setv[] = {
 100         "WLDS", NULL, NULL, NULL,
 101         "CAMS", NULL, NULL, NULL,
 102         "SDSP", "PBLS", "HDPS", NULL,
 103         "CFVS", NULL, NULL, NULL,
 104         "USBG", NULL, NULL, "MODS",
 105         "CRDS", NULL
 106 };
 107
 108 #define EEEPC_EC        "\\_SB.PCI0.SBRG.EC0."
 109
 110 #define EEEPC_EC_FAN_PWM        EEEPC_EC "SC02" /* Fan PWM duty cycle (%) */
 111 #define EEEPC_EC_SC02           0x63
 112 #define EEEPC_EC_FAN_HRPM       EEEPC_EC "SC05" /* High byte, fan speed (RPM) */
 113 #define EEEPC_EC_FAN_LRPM       EEEPC_EC "SC06" /* Low byte, fan speed (RPM) */
 114 #define EEEPC_EC_FAN_CTRL       EEEPC_EC "SFB3" /* Byte containing SF25  */
 115 #define EEEPC_EC_SFB3           0xD3
 116
 117 /*
 118  * This is the main structure, we can use it to store useful information
 119  * about the hotk device
 120  */
 121 struct eeepc_hotk {
 122         struct acpi_device *device;     /* the device we are in */
 123         acpi_handle handle;             /* the handle of the hotk device */
 124         u32 cm_supported;               /* the control methods supported
 125                                            by this BIOS */
 126         uint init_flag;                 /* Init flags */
 127         u16 event_count[128];           /* count for each event */
 128 };
 129
 130 /* The actual device the driver binds to */
 131 static struct eeepc_hotk *ehotk;
 132
 133 /* Platform device/driver */
 134 static struct platform_driver platform_driver = {
 135         .driver = {
 136                 .name = EEEPC_HOTK_FILE,
 137                 .owner = THIS_MODULE,
 138         }
 139 };
 140
 141 static struct platform_device *platform_device;
 142
 143 /*
 144  * The hotkey driver declaration
 145  */
 146 static int eeepc_hotk_add(struct acpi_device *device);
 147 static int eeepc_hotk_remove(struct acpi_device *device, int type);
 148
 149 static const struct acpi_device_id eeepc_device_ids[] = {
 150         {EEEPC_HOTK_HID, 0},
 151         {"", 0},
 152 };
 153 MODULE_DEVICE_TABLE(acpi, eeepc_device_ids);
 154
 155 static struct acpi_driver eeepc_hotk_driver = {
 156         .name = EEEPC_HOTK_NAME,
 157         .class = EEEPC_HOTK_CLASS,
 158         .ids = eeepc_device_ids,
 159         .ops = {
 160                 .add = eeepc_hotk_add,
 161                 .remove = eeepc_hotk_remove,
 162         },
 163 };
 164
 165 /* The backlight device /sys/class/backlight */
 166 static struct backlight_device *eeepc_backlight_device;
 167
 168 /* The hwmon device */
 169 static struct device *eeepc_hwmon_device;
 170
 171 /*
 172  * The backlight class declaration
 173  */
 174 static int read_brightness(struct backlight_device *bd);
 175 static int update_bl_status(struct backlight_device *bd);
 176 static struct backlight_ops eeepcbl_ops = {
 177         .get_brightness = read_brightness,
 178         .update_status = update_bl_status,
 179 };
 180
 181 MODULE_AUTHOR("Corentin Chary, Eric Cooper");
 182 MODULE_DESCRIPTION(EEEPC_HOTK_NAME);
 183 MODULE_LICENSE("GPL");
 184
 185 /*
 186  * ACPI Helpers
 187  */
 188 static int write_acpi_int(acpi_handle handle, const char *method, int val,
 189                           struct acpi_buffer *output)
 190 {
 191         struct acpi_object_list params;
 192         union acpi_object in_obj;
 193         acpi_status status;
 194
 195         params.count = 1;
 196         params.pointer = &in_obj;
 197         in_obj.type = ACPI_TYPE_INTEGER;
 198         in_obj.integer.value = val;
 199
 200         status = acpi_evaluate_object(handle, (char *)method, &params, output);
 201         return (status == AE_OK ? 0 : -1);
 202 }
 203
 204 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
 205 {
 206         acpi_status status;
 207         ulong result;
 208
 209         status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
 210         if (ACPI_FAILURE(status)) {
 211                 *val = -1;
 212                 return -1;
 213         } else {
 214                 *val = result;
 215                 return 0;
 216         }
 217 }
 218
 219 static int set_acpi(int cm, int value)
 220 {
 221         if (ehotk->cm_supported & (0x1 << cm)) {
 222                 const char *method = cm_setv[cm];
 223                 if (method == NULL)
 224                         return -ENODEV;
 225                 if (write_acpi_int(ehotk->handle, method, value, NULL))
 226                         printk(EEEPC_WARNING "Error writing %s\n", method);
 227         }
 228         return 0;
 229 }
 230
 231 static int get_acpi(int cm)
 232 {
 233         int value = -1;
 234         if ((ehotk->cm_supported & (0x1 << cm))) {
 235                 const char *method = cm_getv[cm];
 236                 if (method == NULL)
 237                         return -ENODEV;
 238                 if (read_acpi_int(ehotk->handle, method, &value))
 239                         printk(EEEPC_WARNING "Error reading %s\n", method);
 240         }
 241         return value;
 242 }
 243
 244 /*
 245  * Backlight
 246  */
 247 static int read_brightness(struct backlight_device *bd)
 248 {
 249         return get_acpi(CM_ASL_PANELBRIGHT);
 250 }
 251
 252 static int set_brightness(struct backlight_device *bd, int value)
 253 {
 254         value = max(0, min(15, value));
 255         return set_acpi(CM_ASL_PANELBRIGHT, value);
 256 }
 257
 258 static int update_bl_status(struct backlight_device *bd)
 259 {
 260         return set_brightness(bd, bd->props.brightness);
 261 }
 262
 263 /*
 264  * Sys helpers
 265  */
 266 static int parse_arg(const char *buf, unsigned long count, int *val)
 267 {
 268         if (!count)
 269                 return 0;
 270         if (sscanf(buf, "%i", val) != 1)
 271                 return -EINVAL;
 272         return count;
 273 }
 274
 275 static ssize_t store_sys_acpi(int cm, const char *buf, size_t count)
 276 {
 277         int rv, value;
 278
 279         rv = parse_arg(buf, count, &value);
 280         if (rv > 0)
 281                 set_acpi(cm, value);
 282         return rv;
 283 }
 284
 285 static ssize_t show_sys_acpi(int cm, char *buf)
 286 {
 287         return sprintf(buf, "%d\n", get_acpi(cm));
 288 }
 289
 290 #define EEEPC_CREATE_DEVICE_ATTR(_name, _cm)                            \
 291         static ssize_t show_##_name(struct device *dev,                 \
 292                                     struct device_attribute *attr,      \
 293                                     char *buf)                          \
 294         {                                                               \
 295                 return show_sys_acpi(_cm, buf);                         \
 296         }                                                               \
 297         static ssize_t store_##_name(struct device *dev,                \
 298                                      struct device_attribute *attr,     \
 299                                      const char *buf, size_t count)     \
 300         {                                                               \
 301                 return store_sys_acpi(_cm, buf, count);                 \
 302         }                                                               \
 303         static struct device_attribute dev_attr_##_name = {             \
 304                 .attr = {                                               \
 305                         .name = __stringify(_name),                     \
 306                         .mode = 0644 },                                 \
 307                 .show   = show_##_name,                                 \
 308                 .store  = store_##_name,                                \
 309         }
 310
 311 EEEPC_CREATE_DEVICE_ATTR(camera, CM_ASL_CAMERA);
 312 EEEPC_CREATE_DEVICE_ATTR(cardr, CM_ASL_CARDREADER);
 313 EEEPC_CREATE_DEVICE_ATTR(disp, CM_ASL_DISPLAYSWITCH);
 314 EEEPC_CREATE_DEVICE_ATTR(wlan, CM_ASL_WLAN);
 315
 316 static struct attribute *platform_attributes[] = {
 317         &dev_attr_camera.attr,
 318         &dev_attr_cardr.attr,
 319         &dev_attr_disp.attr,
 320         &dev_attr_wlan.attr,
 321         NULL
 322 };
 323
 324 static struct attribute_group platform_attribute_group = {
 325         .attrs = platform_attributes
 326 };
 327
 328 /*
 329  * Hotkey functions
 330  */
 331 static int eeepc_hotk_check(void)
 332 {
 333         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 334         int result;
 335
 336         result = acpi_bus_get_status(ehotk->device);
 337         if (result)
 338                 return result;
 339         if (ehotk->device->status.present) {
 340                 if (write_acpi_int(ehotk->handle, "INIT", ehotk->init_flag,
 341                                     &buffer)) {
 342                         printk(EEEPC_ERR "Hotkey initialization failed\n");
 343                         return -ENODEV;
 344                 } else {
 345                         printk(EEEPC_NOTICE "Hotkey init flags 0x%x\n",
 346                                ehotk->init_flag);
 347                 }
 348                 /* get control methods supported */
 349                 if (read_acpi_int(ehotk->handle, "CMSG"
 350                                    , &ehotk->cm_supported)) {
 351                         printk(EEEPC_ERR
 352                                "Get control methods supported failed\n");
 353                         return -ENODEV;
 354                 } else {
 355                         printk(EEEPC_INFO
 356                                "Get control methods supported: 0x%x\n",
 357                                ehotk->cm_supported);
 358                 }
 359         } else {
 360                 printk(EEEPC_ERR "Hotkey device not present, aborting\n");
 361                 return -EINVAL;
 362         }
 363         return 0;
 364 }
 365
 366 static void notify_wlan(u32 *event)
 367 {
 368         /* if DISABLE_ASL_WLAN is set, the notify code for fn+f2
 369            will always be 0x10 */
 370         if (ehotk->cm_supported & (0x1 << CM_ASL_WLAN)) {
 371                 const char *method = cm_getv[CM_ASL_WLAN];
 372                 int value;
 373                 if (read_acpi_int(ehotk->handle, method, &value))
 374                         printk(EEEPC_WARNING "Error reading %s\n",
 375                                method);
 376                 else if (value == 1)
 377                         *event = 0x11;
 378         }
 379 }
 380
 381 static void notify_brn(void)
 382 {
 383         struct backlight_device *bd = eeepc_backlight_device;
 384         bd->props.brightness = read_brightness(bd);
 385 }
 386
 387 static void eeepc_hotk_notify(acpi_handle handle, u32 event, void *data)
 388 {
 389         if (!ehotk)
 390                 return;
 391         if (event == NOTIFY_WLAN_ON && (DISABLE_ASL_WLAN & ehotk->init_flag))
 392                 notify_wlan(&event);
 393         if (event >= NOTIFY_BRN_MIN && event <= NOTIFY_BRN_MAX)
 394                 notify_brn();
 395         acpi_bus_generate_proc_event(ehotk->device, event,
 396                                      ehotk->event_count[event % 128]++);
 397 }
 398
 399 static int eeepc_hotk_add(struct acpi_device *device)
 400 {
 401         acpi_status status = AE_OK;
 402         int result;
 403
 404         if (!device)
 405                  return -EINVAL;
 406         printk(EEEPC_NOTICE EEEPC_HOTK_NAME "\n");
 407         ehotk = kzalloc(sizeof(struct eeepc_hotk), GFP_KERNEL);
 408         if (!ehotk)
 409                 return -ENOMEM;
 410         ehotk->init_flag = DISABLE_ASL_WLAN | DISABLE_ASL_DISPLAYSWITCH;
 411         ehotk->handle = device->handle;
 412         strcpy(acpi_device_name(device), EEEPC_HOTK_DEVICE_NAME);
 413         strcpy(acpi_device_class(device), EEEPC_HOTK_CLASS);
 414         acpi_driver_data(device) = ehotk;
 415         ehotk->device = device;
 416         result = eeepc_hotk_check();
 417         if (result)
 418                 goto end;
 419         status = acpi_install_notify_handler(ehotk->handle, ACPI_SYSTEM_NOTIFY,
 420                                              eeepc_hotk_notify, ehotk);
 421         if (ACPI_FAILURE(status))
 422                 printk(EEEPC_ERR "Error installing notify handler\n");
 423  end:
 424         if (result) {
 425                 kfree(ehotk);
 426                 ehotk = NULL;
 427         }
 428         return result;
 429 }
 430
 431 static int eeepc_hotk_remove(struct acpi_device *device, int type)
 432 {
 433         acpi_status status = 0;
 434
 435         if (!device || !acpi_driver_data(device))
 436                  return -EINVAL;
 437         status = acpi_remove_notify_handler(ehotk->handle, ACPI_SYSTEM_NOTIFY,
 438                                             eeepc_hotk_notify);
 439         if (ACPI_FAILURE(status))
 440                 printk(EEEPC_ERR "Error removing notify handler\n");
 441         kfree(ehotk);
 442         return 0;
 443 }
 444
 445 /*
 446  * Hwmon
 447  */
 448 static int eeepc_get_fan_pwm(void)
 449 {
 450         int value = 0;
 451
 452         read_acpi_int(NULL, EEEPC_EC_FAN_PWM, &value);
 453         return (value);
 454 }
 455
 456 static void eeepc_set_fan_pwm(int value)
 457 {
 458         value = SENSORS_LIMIT(value, 0, 100);
 459         ec_write(EEEPC_EC_SC02, value);
 460 }
 461
 462 static int eeepc_get_fan_rpm(void)
 463 {
 464         int high = 0;
 465         int low = 0;
 466
 467         read_acpi_int(NULL, EEEPC_EC_FAN_HRPM, &high);
 468         read_acpi_int(NULL, EEEPC_EC_FAN_LRPM, &low);
 469         return (high << 8 | low);
 470 }
 471
 472 static int eeepc_get_fan_ctrl(void)
 473 {
 474         int value = 0;
 475
 476         read_acpi_int(NULL, EEEPC_EC_FAN_CTRL, &value);
 477         return ((value & 0x02 ? 1 : 0));
 478 }
 479
 480 static void eeepc_set_fan_ctrl(int manual)
 481 {
 482         int value = 0;
 483
 484         read_acpi_int(NULL, EEEPC_EC_FAN_CTRL, &value);
 485         if (manual)
 486                 value |= 0x02;
 487         else
 488                 value &= ~0x02;
 489         ec_write(EEEPC_EC_SFB3, value);
 490 }
 491
 492 static ssize_t store_sys_hwmon(void (*set)(int), const char *buf, size_t count)
 493 {
 494         int rv, value;
 495
 496         rv = parse_arg(buf, count, &value);
 497         if (rv > 0)
 498                 set(value);
 499         return rv;
 500 }
 501
 502 static ssize_t show_sys_hwmon(int (*get)(void), char *buf)
 503 {
 504         return sprintf(buf, "%d\n", get());
 505 }
 506
 507 #define EEEPC_CREATE_SENSOR_ATTR(_name, _mode, _set, _get)              \
 508         static ssize_t show_##_name(struct device *dev,                 \
 509                                     struct device_attribute *attr,      \
 510                                     char *buf)                          \
 511         {                                                               \
 512                 return show_sys_hwmon(_set, buf);                       \
 513         }                                                               \
 514         static ssize_t store_##_name(struct device *dev,                \
 515                                      struct device_attribute *attr,     \
 516                                      const char *buf, size_t count)     \
 517         {                                                               \
 518                 return store_sys_hwmon(_get, buf, count);               \
 519         }                                                               \
 520         static SENSOR_DEVICE_ATTR(_name, _mode, show_##_name, store_##_name, 0);
 521
 522 EEEPC_CREATE_SENSOR_ATTR(fan1_input, S_IRUGO, eeepc_get_fan_rpm, NULL);
 523 EEEPC_CREATE_SENSOR_ATTR(fan1_pwm, S_IRUGO | S_IWUSR,
 524                          eeepc_get_fan_pwm, eeepc_set_fan_pwm);
 525 EEEPC_CREATE_SENSOR_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
 526                          eeepc_get_fan_ctrl, eeepc_set_fan_ctrl);
 527
 528 static struct attribute *hwmon_attributes[] = {
 529         &sensor_dev_attr_fan1_pwm.dev_attr.attr,
 530         &sensor_dev_attr_fan1_input.dev_attr.attr,
 531         &sensor_dev_attr_pwm1_enable.dev_attr.attr,
 532         NULL
 533 };
 534
 535 static struct attribute_group hwmon_attribute_group = {
 536         .attrs = hwmon_attributes
 537 };
 538
 539 /*
 540  * exit/init
 541  */
 542 static void eeepc_backlight_exit(void)
 543 {
 544         if (eeepc_backlight_device)
 545                 backlight_device_unregister(eeepc_backlight_device);
 546         eeepc_backlight_device = NULL;
 547 }
 548
 549 static void eeepc_hwmon_exit(void)
 550 {
 551         struct device *hwmon;
 552
 553         hwmon = eeepc_hwmon_device;
 554         if (!hwmon)
 555                 return ;
 556         sysfs_remove_group(&hwmon->kobj,
 557                            &hwmon_attribute_group);
 558         hwmon_device_unregister(hwmon);
 559         eeepc_hwmon_device = NULL;
 560 }
 561
 562 static void __exit eeepc_laptop_exit(void)
 563 {
 564         eeepc_backlight_exit();
 565         eeepc_hwmon_exit();
 566         acpi_bus_unregister_driver(&eeepc_hotk_driver);
 567         sysfs_remove_group(&platform_device->dev.kobj,
 568                            &platform_attribute_group);
 569         platform_device_unregister(platform_device);
 570         platform_driver_unregister(&platform_driver);
 571 }
 572
 573 static int eeepc_backlight_init(struct device *dev)
 574 {
 575         struct backlight_device *bd;
 576
 577         bd = backlight_device_register(EEEPC_HOTK_FILE, dev,
 578                                        NULL, &eeepcbl_ops);
 579         if (IS_ERR(bd)) {
 580                 printk(EEEPC_ERR
 581                        "Could not register eeepc backlight device\n");
 582                 eeepc_backlight_device = NULL;
 583                 return PTR_ERR(bd);
 584         }
 585         eeepc_backlight_device = bd;
 586         bd->props.max_brightness = 15;
 587         bd->props.brightness = read_brightness(NULL);
 588         bd->props.power = FB_BLANK_UNBLANK;
 589         backlight_update_status(bd);
 590         return 0;
 591 }
 592
 593 static int eeepc_hwmon_init(struct device *dev)
 594 {
 595         struct device *hwmon;
 596         int result;
 597
 598         hwmon = hwmon_device_register(dev);
 599         if (IS_ERR(hwmon)) {
 600                 printk(EEEPC_ERR
 601                        "Could not register eeepc hwmon device\n");
 602                 eeepc_hwmon_device = NULL;
 603                 return PTR_ERR(hwmon);
 604         }
 605         eeepc_hwmon_device = hwmon;
 606         result = sysfs_create_group(&hwmon->kobj,
 607                                     &hwmon_attribute_group);
 608         if (result)
 609                 eeepc_hwmon_exit();
 610         return result;
 611 }
 612
 613 static int __init eeepc_laptop_init(void)
 614 {
 615         struct device *dev;
 616         int result;
 617
 618         if (acpi_disabled)
 619                 return -ENODEV;
 620         result = acpi_bus_register_driver(&eeepc_hotk_driver);
 621         if (result < 0)
 622                 return result;
 623         if (!ehotk) {
 624                 acpi_bus_unregister_driver(&eeepc_hotk_driver);
 625                 return -ENODEV;
 626         }
 627         dev = acpi_get_physical_device(ehotk->device->handle);
 628         result = eeepc_backlight_init(dev);
 629         if (result)
 630                 goto fail_backlight;
 631         result = eeepc_hwmon_init(dev);
 632         if (result)
 633                 goto fail_hwmon;
 634         /* Register platform stuff */
 635         result = platform_driver_register(&platform_driver);
 636         if (result)
 637                 goto fail_platform_driver;
 638         platform_device = platform_device_alloc(EEEPC_HOTK_FILE, -1);
 639         if (!platform_device) {
 640                 result = -ENOMEM;
 641                 goto fail_platform_device1;
 642         }
 643         result = platform_device_add(platform_device);
 644         if (result)
 645                 goto fail_platform_device2;
 646         result = sysfs_create_group(&platform_device->dev.kobj,
 647                                     &platform_attribute_group);
 648         if (result)
 649                 goto fail_sysfs;
 650         return 0;
 651 fail_sysfs:
 652         platform_device_del(platform_device);
 653 fail_platform_device2:
 654         platform_device_put(platform_device);
 655 fail_platform_device1:
 656         platform_driver_unregister(&platform_driver);
 657 fail_platform_driver:
 658         eeepc_hwmon_exit();
 659 fail_hwmon:
 660         eeepc_backlight_exit();
 661 fail_backlight:
 662         return result;
 663 }
 664
 665 module_init(eeepc_laptop_init);
 666 module_exit(eeepc_laptop_exit);