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 #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
  55 enum {
  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
  67 enum {
  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
  92 static 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
 101 static 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  */
 123 struct 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 */
 137 static struct eeepc_hotk *ehotk;
 138
 139 /* Platform device/driver */
 140 static struct platform_driver platform_driver = {
 141         .driver = {
 142                 .name = EEEPC_HOTK_FILE,
 143                 .owner = THIS_MODULE,
 144         }
 145 };
 146
 147 static struct platform_device *platform_device;
 148
 149 struct key_entry {
 150         char type;
 151         u8 code;
 152         u16 keycode;
 153 };
 154
 155 enum { KE_KEY, KE_END };
 156
 157 static 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  */
 173 static int eeepc_hotk_add(struct acpi_device *device);
 174 static int eeepc_hotk_remove(struct acpi_device *device, int type);
 175
 176 static const struct acpi_device_id eeepc_device_ids[] = {
 177         {EEEPC_HOTK_HID, 0},
 178         {"", 0},
 179 };
 180 MODULE_DEVICE_TABLE(acpi, eeepc_device_ids);
 181
 182 static 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 */
 193 static struct backlight_device *eeepc_backlight_device;
 194
 195 /* The hwmon device */
 196 static struct device *eeepc_hwmon_device;
 197
 198 /*
 199  * The backlight class declaration
 200  */
 201 static int read_brightness(struct backlight_device *bd);
 202 static int update_bl_status(struct backlight_device *bd);
 203 static struct backlight_ops eeepcbl_ops = {
 204         .get_brightness = read_brightness,
 205         .update_status = update_bl_status,
 206 };
 207
 208 MODULE_AUTHOR("Corentin Chary, Eric Cooper");
 209 MODULE_DESCRIPTION(EEEPC_HOTK_NAME);
 210 MODULE_LICENSE("GPL");
 211
 212 /*
 213  * ACPI Helpers
 214  */
 215 static 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
 231 static 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
 246 static 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
 258 static 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  */
 274 static int read_brightness(struct backlight_device *bd)
 275 {
 276         return get_acpi(CM_ASL_PANELBRIGHT);
 277 }
 278
 279 static 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
 285 static 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
 294 static 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
 302 static 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
 311 static 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
 319 static 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  */
 331 static 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
 340 static 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
 350 static 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
 376 EEEPC_CREATE_DEVICE_ATTR(camera, CM_ASL_CAMERA);
 377 EEEPC_CREATE_DEVICE_ATTR(cardr, CM_ASL_CARDREADER);
 378 EEEPC_CREATE_DEVICE_ATTR(disp, CM_ASL_DISPLAYSWITCH);
 379
 380 static struct attribute *platform_attributes[] = {
 381         &dev_attr_camera.attr,
 382         &dev_attr_cardr.attr,
 383         &dev_attr_disp.attr,
 384         NULL
 385 };
 386
 387 static struct attribute_group platform_attribute_group = {
 388         .attrs = platform_attributes
 389 };
 390
 391 /*
 392  * Hotkey functions
 393  */
 394 static 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
 405 static 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
 416 static 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
 428 static 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
 449 static 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
 510 static void notify_brn(void)
 511 {
 512         struct backlight_device *bd = eeepc_backlight_device;
 513         bd->props.brightness = read_brightness(bd);
 514 }
 515
 516 static 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
 542 static 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
 615 static 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  */
 632 static 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
 641 static 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
 648 static 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
 658 static 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
 666 static 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
 678 static 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
 688 static 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
 708 EEEPC_CREATE_SENSOR_ATTR(fan1_input, S_IRUGO, eeepc_get_fan_rpm, NULL);
 709 EEEPC_CREATE_SENSOR_ATTR(pwm1, S_IRUGO | S_IWUSR,
 710                          eeepc_get_fan_pwm, eeepc_set_fan_pwm);
 711 EEEPC_CREATE_SENSOR_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
 712                          eeepc_get_fan_ctrl, eeepc_set_fan_ctrl);
 713
 714 static ssize_t
 715 show_name(struct device *dev, struct device_attribute *attr, char *buf)
 716 {
 717         return sprintf(buf, "eeepc\n");
 718 }
 719 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
 720
 721 static 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
 729 static struct attribute_group hwmon_attribute_group = {
 730         .attrs = hwmon_attributes
 731 };
 732
 733 /*
 734  * exit/init
 735  */
 736 static 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
 749 static 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
 762 static 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
 773 static 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
 793 static 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
 813 static 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;
 857 fail_sysfs:
 858         platform_device_del(platform_device);
 859 fail_platform_device2:
 860         platform_device_put(platform_device);
 861 fail_platform_device1:
 862         platform_driver_unregister(&platform_driver);
 863 fail_platform_driver:
 864         eeepc_hwmon_exit();
 865 fail_hwmon:
 866         eeepc_backlight_exit();
 867 fail_backlight:
 868         return result;
 869 }
 870
 871 module_init(eeepc_laptop_init);
 872 module_exit(eeepc_laptop_exit);