drivers/platform/x86/ideapad-laptop.c

   1 /*
   2  *  ideapad-laptop.c - Lenovo IdeaPad ACPI Extras
   3  *
   4  *  Copyright © 2010 Intel Corporation
   5  *  Copyright © 2010 David Woodhouse <dwmw2@infradead.org>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  *  02110-1301, USA.
  21  */
  22
  23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/init.h>
  28 #include <linux/types.h>
  29 #include <acpi/acpi_bus.h>
  30 #include <acpi/acpi_drivers.h>
  31 #include <linux/rfkill.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/input.h>
  34 #include <linux/input/sparse-keymap.h>
  35 #include <linux/backlight.h>
  36 #include <linux/fb.h>
  37 #include <linux/debugfs.h>
  38 #include <linux/seq_file.h>
  39
  40 #define IDEAPAD_RFKILL_DEV_NUM  (3)
  41
  42 #define CFG_BT_BIT      (16)
  43 #define CFG_3G_BIT      (17)
  44 #define CFG_WIFI_BIT    (18)
  45 #define CFG_CAMERA_BIT  (19)
  46
  47 enum {
  48         VPCCMD_R_VPC1 = 0x10,
  49         VPCCMD_R_BL_MAX,
  50         VPCCMD_R_BL,
  51         VPCCMD_W_BL,
  52         VPCCMD_R_WIFI,
  53         VPCCMD_W_WIFI,
  54         VPCCMD_R_BT,
  55         VPCCMD_W_BT,
  56         VPCCMD_R_BL_POWER,
  57         VPCCMD_R_NOVO,
  58         VPCCMD_R_VPC2,
  59         VPCCMD_R_TOUCHPAD,
  60         VPCCMD_W_TOUCHPAD,
  61         VPCCMD_R_CAMERA,
  62         VPCCMD_W_CAMERA,
  63         VPCCMD_R_3G,
  64         VPCCMD_W_3G,
  65         VPCCMD_R_ODD, /* 0x21 */
  66         VPCCMD_R_RF = 0x23,
  67         VPCCMD_W_RF,
  68         VPCCMD_W_BL_POWER = 0x33,
  69 };
  70
  71 struct ideapad_private {
  72         struct rfkill *rfk[IDEAPAD_RFKILL_DEV_NUM];
  73         struct platform_device *platform_device;
  74         struct input_dev *inputdev;
  75         struct backlight_device *blightdev;
  76         struct dentry *debug;
  77         unsigned long cfg;
  78 };
  79
  80 static acpi_handle ideapad_handle;
  81 static struct ideapad_private *ideapad_priv;
  82 static bool no_bt_rfkill;
  83 module_param(no_bt_rfkill, bool, 0444);
  84 MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth.");
  85
  86 /*
  87  * ACPI Helpers
  88  */
  89 #define IDEAPAD_EC_TIMEOUT (100) /* in ms */
  90
  91 static int read_method_int(acpi_handle handle, const char *method, int *val)
  92 {
  93         acpi_status status;
  94         unsigned long long result;
  95
  96         status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
  97         if (ACPI_FAILURE(status)) {
  98                 *val = -1;
  99                 return -1;
 100         } else {
 101                 *val = result;
 102                 return 0;
 103         }
 104 }
 105
 106 static int method_vpcr(acpi_handle handle, int cmd, int *ret)
 107 {
 108         acpi_status status;
 109         unsigned long long result;
 110         struct acpi_object_list params;
 111         union acpi_object in_obj;
 112
 113         params.count = 1;
 114         params.pointer = &in_obj;
 115         in_obj.type = ACPI_TYPE_INTEGER;
 116         in_obj.integer.value = cmd;
 117
 118         status = acpi_evaluate_integer(handle, "VPCR", &params, &result);
 119
 120         if (ACPI_FAILURE(status)) {
 121                 *ret = -1;
 122                 return -1;
 123         } else {
 124                 *ret = result;
 125                 return 0;
 126         }
 127 }
 128
 129 static int method_vpcw(acpi_handle handle, int cmd, int data)
 130 {
 131         struct acpi_object_list params;
 132         union acpi_object in_obj[2];
 133         acpi_status status;
 134
 135         params.count = 2;
 136         params.pointer = in_obj;
 137         in_obj[0].type = ACPI_TYPE_INTEGER;
 138         in_obj[0].integer.value = cmd;
 139         in_obj[1].type = ACPI_TYPE_INTEGER;
 140         in_obj[1].integer.value = data;
 141
 142         status = acpi_evaluate_object(handle, "VPCW", &params, NULL);
 143         if (status != AE_OK)
 144                 return -1;
 145         return 0;
 146 }
 147
 148 static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
 149 {
 150         int val;
 151         unsigned long int end_jiffies;
 152
 153         if (method_vpcw(handle, 1, cmd))
 154                 return -1;
 155
 156         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
 157              time_before(jiffies, end_jiffies);) {
 158                 schedule();
 159                 if (method_vpcr(handle, 1, &val))
 160                         return -1;
 161                 if (val == 0) {
 162                         if (method_vpcr(handle, 0, &val))
 163                                 return -1;
 164                         *data = val;
 165                         return 0;
 166                 }
 167         }
 168         pr_err("timeout in read_ec_cmd\n");
 169         return -1;
 170 }
 171
 172 static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
 173 {
 174         int val;
 175         unsigned long int end_jiffies;
 176
 177         if (method_vpcw(handle, 0, data))
 178                 return -1;
 179         if (method_vpcw(handle, 1, cmd))
 180                 return -1;
 181
 182         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
 183              time_before(jiffies, end_jiffies);) {
 184                 schedule();
 185                 if (method_vpcr(handle, 1, &val))
 186                         return -1;
 187                 if (val == 0)
 188                         return 0;
 189         }
 190         pr_err("timeout in write_ec_cmd\n");
 191         return -1;
 192 }
 193
 194 /*
 195  * debugfs
 196  */
 197 static int debugfs_status_show(struct seq_file *s, void *data)
 198 {
 199         unsigned long value;
 200
 201         if (!read_ec_data(ideapad_handle, VPCCMD_R_BL_MAX, &value))
 202                 seq_printf(s, "Backlight max:\t%lu\n", value);
 203         if (!read_ec_data(ideapad_handle, VPCCMD_R_BL, &value))
 204                 seq_printf(s, "Backlight now:\t%lu\n", value);
 205         if (!read_ec_data(ideapad_handle, VPCCMD_R_BL_POWER, &value))
 206                 seq_printf(s, "BL power value:\t%s\n", value ? "On" : "Off");
 207         seq_printf(s, "=====================\n");
 208
 209         if (!read_ec_data(ideapad_handle, VPCCMD_R_RF, &value))
 210                 seq_printf(s, "Radio status:\t%s(%lu)\n",
 211                            value ? "On" : "Off", value);
 212         if (!read_ec_data(ideapad_handle, VPCCMD_R_WIFI, &value))
 213                 seq_printf(s, "Wifi status:\t%s(%lu)\n",
 214                            value ? "On" : "Off", value);
 215         if (!read_ec_data(ideapad_handle, VPCCMD_R_BT, &value))
 216                 seq_printf(s, "BT status:\t%s(%lu)\n",
 217                            value ? "On" : "Off", value);
 218         if (!read_ec_data(ideapad_handle, VPCCMD_R_3G, &value))
 219                 seq_printf(s, "3G status:\t%s(%lu)\n",
 220                            value ? "On" : "Off", value);
 221         seq_printf(s, "=====================\n");
 222
 223         if (!read_ec_data(ideapad_handle, VPCCMD_R_TOUCHPAD, &value))
 224                 seq_printf(s, "Touchpad status:%s(%lu)\n",
 225                            value ? "On" : "Off", value);
 226         if (!read_ec_data(ideapad_handle, VPCCMD_R_CAMERA, &value))
 227                 seq_printf(s, "Camera status:\t%s(%lu)\n",
 228                            value ? "On" : "Off", value);
 229
 230         return 0;
 231 }
 232
 233 static int debugfs_status_open(struct inode *inode, struct file *file)
 234 {
 235         return single_open(file, debugfs_status_show, NULL);
 236 }
 237
 238 static const struct file_operations debugfs_status_fops = {
 239         .owner = THIS_MODULE,
 240         .open = debugfs_status_open,
 241         .read = seq_read,
 242         .llseek = seq_lseek,
 243         .release = single_release,
 244 };
 245
 246 static int debugfs_cfg_show(struct seq_file *s, void *data)
 247 {
 248         if (!ideapad_priv) {
 249                 seq_printf(s, "cfg: N/A\n");
 250         } else {
 251                 seq_printf(s, "cfg: 0x%.8lX\n\nCapability: ",
 252                            ideapad_priv->cfg);
 253                 if (test_bit(CFG_BT_BIT, &ideapad_priv->cfg))
 254                         seq_printf(s, "Bluetooth ");
 255                 if (test_bit(CFG_3G_BIT, &ideapad_priv->cfg))
 256                         seq_printf(s, "3G ");
 257                 if (test_bit(CFG_WIFI_BIT, &ideapad_priv->cfg))
 258                         seq_printf(s, "Wireless ");
 259                 if (test_bit(CFG_CAMERA_BIT, &ideapad_priv->cfg))
 260                         seq_printf(s, "Camera ");
 261                 seq_printf(s, "\nGraphic: ");
 262                 switch ((ideapad_priv->cfg)&0x700) {
 263                 case 0x100:
 264                         seq_printf(s, "Intel");
 265                         break;
 266                 case 0x200:
 267                         seq_printf(s, "ATI");
 268                         break;
 269                 case 0x300:
 270                         seq_printf(s, "Nvidia");
 271                         break;
 272                 case 0x400:
 273                         seq_printf(s, "Intel and ATI");
 274                         break;
 275                 case 0x500:
 276                         seq_printf(s, "Intel and Nvidia");
 277                         break;
 278                 }
 279                 seq_printf(s, "\n");
 280         }
 281         return 0;
 282 }
 283
 284 static int debugfs_cfg_open(struct inode *inode, struct file *file)
 285 {
 286         return single_open(file, debugfs_cfg_show, NULL);
 287 }
 288
 289 static const struct file_operations debugfs_cfg_fops = {
 290         .owner = THIS_MODULE,
 291         .open = debugfs_cfg_open,
 292         .read = seq_read,
 293         .llseek = seq_lseek,
 294         .release = single_release,
 295 };
 296
 297 static int __devinit ideapad_debugfs_init(struct ideapad_private *priv)
 298 {
 299         struct dentry *node;
 300
 301         priv->debug = debugfs_create_dir("ideapad", NULL);
 302         if (priv->debug == NULL) {
 303                 pr_err("failed to create debugfs directory");
 304                 goto errout;
 305         }
 306
 307         node = debugfs_create_file("cfg", S_IRUGO, priv->debug, NULL,
 308                                    &debugfs_cfg_fops);
 309         if (!node) {
 310                 pr_err("failed to create cfg in debugfs");
 311                 goto errout;
 312         }
 313
 314         node = debugfs_create_file("status", S_IRUGO, priv->debug, NULL,
 315                                    &debugfs_status_fops);
 316         if (!node) {
 317                 pr_err("failed to create status in debugfs");
 318                 goto errout;
 319         }
 320
 321         return 0;
 322
 323 errout:
 324         return -ENOMEM;
 325 }
 326
 327 static void ideapad_debugfs_exit(struct ideapad_private *priv)
 328 {
 329         debugfs_remove_recursive(priv->debug);
 330         priv->debug = NULL;
 331 }
 332
 333 /*
 334  * sysfs
 335  */
 336 static ssize_t show_ideapad_cam(struct device *dev,
 337                                 struct device_attribute *attr,
 338                                 char *buf)
 339 {
 340         unsigned long result;
 341
 342         if (read_ec_data(ideapad_handle, VPCCMD_R_CAMERA, &result))
 343                 return sprintf(buf, "-1\n");
 344         return sprintf(buf, "%lu\n", result);
 345 }
 346
 347 static ssize_t store_ideapad_cam(struct device *dev,
 348                                  struct device_attribute *attr,
 349                                  const char *buf, size_t count)
 350 {
 351         int ret, state;
 352
 353         if (!count)
 354                 return 0;
 355         if (sscanf(buf, "%i", &state) != 1)
 356                 return -EINVAL;
 357         ret = write_ec_cmd(ideapad_handle, VPCCMD_W_CAMERA, state);
 358         if (ret < 0)
 359                 return ret;
 360         return count;
 361 }
 362
 363 static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
 364
 365 static struct attribute *ideapad_attributes[] = {
 366         &dev_attr_camera_power.attr,
 367         NULL
 368 };
 369
 370 static umode_t ideapad_is_visible(struct kobject *kobj,
 371                                  struct attribute *attr,
 372                                  int idx)
 373 {
 374         struct device *dev = container_of(kobj, struct device, kobj);
 375         struct ideapad_private *priv = dev_get_drvdata(dev);
 376         bool supported;
 377
 378         if (attr == &dev_attr_camera_power.attr)
 379                 supported = test_bit(CFG_CAMERA_BIT, &(priv->cfg));
 380         else
 381                 supported = true;
 382
 383         return supported ? attr->mode : 0;
 384 }
 385
 386 static struct attribute_group ideapad_attribute_group = {
 387         .is_visible = ideapad_is_visible,
 388         .attrs = ideapad_attributes
 389 };
 390
 391 /*
 392  * Rfkill
 393  */
 394 struct ideapad_rfk_data {
 395         char *name;
 396         int cfgbit;
 397         int opcode;
 398         int type;
 399 };
 400
 401 const struct ideapad_rfk_data ideapad_rfk_data[] = {
 402         { "ideapad_wlan",    CFG_WIFI_BIT, VPCCMD_W_WIFI, RFKILL_TYPE_WLAN },
 403         { "ideapad_bluetooth", CFG_BT_BIT, VPCCMD_W_BT, RFKILL_TYPE_BLUETOOTH },
 404         { "ideapad_3g",        CFG_3G_BIT, VPCCMD_W_3G, RFKILL_TYPE_WWAN },
 405 };
 406
 407 static int ideapad_rfk_set(void *data, bool blocked)
 408 {
 409         unsigned long opcode = (unsigned long)data;
 410
 411         return write_ec_cmd(ideapad_handle, opcode, !blocked);
 412 }
 413
 414 static struct rfkill_ops ideapad_rfk_ops = {
 415         .set_block = ideapad_rfk_set,
 416 };
 417
 418 static void ideapad_sync_rfk_state(struct ideapad_private *priv)
 419 {
 420         unsigned long hw_blocked;
 421         int i;
 422
 423         if (read_ec_data(ideapad_handle, VPCCMD_R_RF, &hw_blocked))
 424                 return;
 425         hw_blocked = !hw_blocked;
 426
 427         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
 428                 if (priv->rfk[i])
 429                         rfkill_set_hw_state(priv->rfk[i], hw_blocked);
 430 }
 431
 432 static int __devinit ideapad_register_rfkill(struct acpi_device *adevice,
 433                                              int dev)
 434 {
 435         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 436         int ret;
 437         unsigned long sw_blocked;
 438
 439         if (no_bt_rfkill &&
 440             (ideapad_rfk_data[dev].type == RFKILL_TYPE_BLUETOOTH)) {
 441                 /* Force to enable bluetooth when no_bt_rfkill=1 */
 442                 write_ec_cmd(ideapad_handle,
 443                              ideapad_rfk_data[dev].opcode, 1);
 444                 return 0;
 445         }
 446
 447         priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev].name, &adevice->dev,
 448                                       ideapad_rfk_data[dev].type, &ideapad_rfk_ops,
 449                                       (void *)(long)dev);
 450         if (!priv->rfk[dev])
 451                 return -ENOMEM;
 452
 453         if (read_ec_data(ideapad_handle, ideapad_rfk_data[dev].opcode-1,
 454                          &sw_blocked)) {
 455                 rfkill_init_sw_state(priv->rfk[dev], 0);
 456         } else {
 457                 sw_blocked = !sw_blocked;
 458                 rfkill_init_sw_state(priv->rfk[dev], sw_blocked);
 459         }
 460
 461         ret = rfkill_register(priv->rfk[dev]);
 462         if (ret) {
 463                 rfkill_destroy(priv->rfk[dev]);
 464                 return ret;
 465         }
 466         return 0;
 467 }
 468
 469 static void ideapad_unregister_rfkill(struct acpi_device *adevice, int dev)
 470 {
 471         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 472
 473         if (!priv->rfk[dev])
 474                 return;
 475
 476         rfkill_unregister(priv->rfk[dev]);
 477         rfkill_destroy(priv->rfk[dev]);
 478 }
 479
 480 /*
 481  * Platform device
 482  */
 483 static int __devinit ideapad_platform_init(struct ideapad_private *priv)
 484 {
 485         int result;
 486
 487         priv->platform_device = platform_device_alloc("ideapad", -1);
 488         if (!priv->platform_device)
 489                 return -ENOMEM;
 490         platform_set_drvdata(priv->platform_device, priv);
 491
 492         result = platform_device_add(priv->platform_device);
 493         if (result)
 494                 goto fail_platform_device;
 495
 496         result = sysfs_create_group(&priv->platform_device->dev.kobj,
 497                                     &ideapad_attribute_group);
 498         if (result)
 499                 goto fail_sysfs;
 500         return 0;
 501
 502 fail_sysfs:
 503         platform_device_del(priv->platform_device);
 504 fail_platform_device:
 505         platform_device_put(priv->platform_device);
 506         return result;
 507 }
 508
 509 static void ideapad_platform_exit(struct ideapad_private *priv)
 510 {
 511         sysfs_remove_group(&priv->platform_device->dev.kobj,
 512                            &ideapad_attribute_group);
 513         platform_device_unregister(priv->platform_device);
 514 }
 515
 516 /*
 517  * input device
 518  */
 519 static const struct key_entry ideapad_keymap[] = {
 520         { KE_KEY, 6,  { KEY_SWITCHVIDEOMODE } },
 521         { KE_KEY, 13, { KEY_WLAN } },
 522         { KE_KEY, 16, { KEY_PROG1 } },
 523         { KE_KEY, 17, { KEY_PROG2 } },
 524         { KE_END, 0 },
 525 };
 526
 527 static int __devinit ideapad_input_init(struct ideapad_private *priv)
 528 {
 529         struct input_dev *inputdev;
 530         int error;
 531
 532         inputdev = input_allocate_device();
 533         if (!inputdev) {
 534                 pr_info("Unable to allocate input device\n");
 535                 return -ENOMEM;
 536         }
 537
 538         inputdev->name = "Ideapad extra buttons";
 539         inputdev->phys = "ideapad/input0";
 540         inputdev->id.bustype = BUS_HOST;
 541         inputdev->dev.parent = &priv->platform_device->dev;
 542
 543         error = sparse_keymap_setup(inputdev, ideapad_keymap, NULL);
 544         if (error) {
 545                 pr_err("Unable to setup input device keymap\n");
 546                 goto err_free_dev;
 547         }
 548
 549         error = input_register_device(inputdev);
 550         if (error) {
 551                 pr_err("Unable to register input device\n");
 552                 goto err_free_keymap;
 553         }
 554
 555         priv->inputdev = inputdev;
 556         return 0;
 557
 558 err_free_keymap:
 559         sparse_keymap_free(inputdev);
 560 err_free_dev:
 561         input_free_device(inputdev);
 562         return error;
 563 }
 564
 565 static void ideapad_input_exit(struct ideapad_private *priv)
 566 {
 567         sparse_keymap_free(priv->inputdev);
 568         input_unregister_device(priv->inputdev);
 569         priv->inputdev = NULL;
 570 }
 571
 572 static void ideapad_input_report(struct ideapad_private *priv,
 573                                  unsigned long scancode)
 574 {
 575         sparse_keymap_report_event(priv->inputdev, scancode, 1, true);
 576 }
 577
 578 static void ideapad_input_novokey(struct ideapad_private *priv)
 579 {
 580         unsigned long long_pressed;
 581
 582         if (read_ec_data(ideapad_handle, VPCCMD_R_NOVO, &long_pressed))
 583                 return;
 584         if (long_pressed)
 585                 ideapad_input_report(priv, 17);
 586         else
 587                 ideapad_input_report(priv, 16);
 588 }
 589
 590 /*
 591  * backlight
 592  */
 593 static int ideapad_backlight_get_brightness(struct backlight_device *blightdev)
 594 {
 595         unsigned long now;
 596
 597         if (read_ec_data(ideapad_handle, VPCCMD_R_BL, &now))
 598                 return -EIO;
 599         return now;
 600 }
 601
 602 static int ideapad_backlight_update_status(struct backlight_device *blightdev)
 603 {
 604         if (write_ec_cmd(ideapad_handle, VPCCMD_W_BL,
 605                          blightdev->props.brightness))
 606                 return -EIO;
 607         if (write_ec_cmd(ideapad_handle, VPCCMD_W_BL_POWER,
 608                          blightdev->props.power == FB_BLANK_POWERDOWN ? 0 : 1))
 609                 return -EIO;
 610
 611         return 0;
 612 }
 613
 614 static const struct backlight_ops ideapad_backlight_ops = {
 615         .get_brightness = ideapad_backlight_get_brightness,
 616         .update_status = ideapad_backlight_update_status,
 617 };
 618
 619 static int ideapad_backlight_init(struct ideapad_private *priv)
 620 {
 621         struct backlight_device *blightdev;
 622         struct backlight_properties props;
 623         unsigned long max, now, power;
 624
 625         if (read_ec_data(ideapad_handle, VPCCMD_R_BL_MAX, &max))
 626                 return -EIO;
 627         if (read_ec_data(ideapad_handle, VPCCMD_R_BL, &now))
 628                 return -EIO;
 629         if (read_ec_data(ideapad_handle, VPCCMD_R_BL_POWER, &power))
 630                 return -EIO;
 631
 632         memset(&props, 0, sizeof(struct backlight_properties));
 633         props.max_brightness = max;
 634         props.type = BACKLIGHT_PLATFORM;
 635         blightdev = backlight_device_register("ideapad",
 636                                               &priv->platform_device->dev,
 637                                               priv,
 638                                               &ideapad_backlight_ops,
 639                                               &props);
 640         if (IS_ERR(blightdev)) {
 641                 pr_err("Could not register backlight device\n");
 642                 return PTR_ERR(blightdev);
 643         }
 644
 645         priv->blightdev = blightdev;
 646         blightdev->props.brightness = now;
 647         blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
 648         backlight_update_status(blightdev);
 649
 650         return 0;
 651 }
 652
 653 static void ideapad_backlight_exit(struct ideapad_private *priv)
 654 {
 655         if (priv->blightdev)
 656                 backlight_device_unregister(priv->blightdev);
 657         priv->blightdev = NULL;
 658 }
 659
 660 static void ideapad_backlight_notify_power(struct ideapad_private *priv)
 661 {
 662         unsigned long power;
 663         struct backlight_device *blightdev = priv->blightdev;
 664
 665         if (!blightdev)
 666                 return;
 667         if (read_ec_data(ideapad_handle, VPCCMD_R_BL_POWER, &power))
 668                 return;
 669         blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
 670 }
 671
 672 static void ideapad_backlight_notify_brightness(struct ideapad_private *priv)
 673 {
 674         unsigned long now;
 675
 676         /* if we control brightness via acpi video driver */
 677         if (priv->blightdev == NULL) {
 678                 read_ec_data(ideapad_handle, VPCCMD_R_BL, &now);
 679                 return;
 680         }
 681
 682         backlight_force_update(priv->blightdev, BACKLIGHT_UPDATE_HOTKEY);
 683 }
 684
 685 /*
 686  * module init/exit
 687  */
 688 static const struct acpi_device_id ideapad_device_ids[] = {
 689         { "VPC2004", 0},
 690         { "", 0},
 691 };
 692 MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
 693
 694 static int __devinit ideapad_acpi_add(struct acpi_device *adevice)
 695 {
 696         int ret, i;
 697         unsigned long cfg;
 698         struct ideapad_private *priv;
 699
 700         if (read_method_int(adevice->handle, "_CFG", (int *)&cfg))
 701                 return -ENODEV;
 702
 703         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 704         if (!priv)
 705                 return -ENOMEM;
 706         dev_set_drvdata(&adevice->dev, priv);
 707         ideapad_priv = priv;
 708         ideapad_handle = adevice->handle;
 709         priv->cfg = cfg;
 710
 711         ret = ideapad_platform_init(priv);
 712         if (ret)
 713                 goto platform_failed;
 714
 715         ret = ideapad_debugfs_init(priv);
 716         if (ret)
 717                 goto debugfs_failed;
 718
 719         ret = ideapad_input_init(priv);
 720         if (ret)
 721                 goto input_failed;
 722
 723         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++) {
 724                 if (test_bit(ideapad_rfk_data[i].cfgbit, &cfg))
 725                         ideapad_register_rfkill(adevice, i);
 726                 else
 727                         priv->rfk[i] = NULL;
 728         }
 729         ideapad_sync_rfk_state(priv);
 730
 731         if (!acpi_video_backlight_support()) {
 732                 ret = ideapad_backlight_init(priv);
 733                 if (ret && ret != -ENODEV)
 734                         goto backlight_failed;
 735         }
 736
 737         return 0;
 738
 739 backlight_failed:
 740         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
 741                 ideapad_unregister_rfkill(adevice, i);
 742         ideapad_input_exit(priv);
 743 input_failed:
 744         ideapad_debugfs_exit(priv);
 745 debugfs_failed:
 746         ideapad_platform_exit(priv);
 747 platform_failed:
 748         kfree(priv);
 749         return ret;
 750 }
 751
 752 static int __devexit ideapad_acpi_remove(struct acpi_device *adevice, int type)
 753 {
 754         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 755         int i;
 756
 757         ideapad_backlight_exit(priv);
 758         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
 759                 ideapad_unregister_rfkill(adevice, i);
 760         ideapad_input_exit(priv);
 761         ideapad_debugfs_exit(priv);
 762         ideapad_platform_exit(priv);
 763         dev_set_drvdata(&adevice->dev, NULL);
 764         kfree(priv);
 765
 766         return 0;
 767 }
 768
 769 static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
 770 {
 771         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 772         acpi_handle handle = adevice->handle;
 773         unsigned long vpc1, vpc2, vpc_bit;
 774
 775         if (read_ec_data(handle, VPCCMD_R_VPC1, &vpc1))
 776                 return;
 777         if (read_ec_data(handle, VPCCMD_R_VPC2, &vpc2))
 778                 return;
 779
 780         vpc1 = (vpc2 << 8) | vpc1;
 781         for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
 782                 if (test_bit(vpc_bit, &vpc1)) {
 783                         switch (vpc_bit) {
 784                         case 9:
 785                                 ideapad_sync_rfk_state(priv);
 786                                 break;
 787                         case 13:
 788                         case 6:
 789                                 ideapad_input_report(priv, vpc_bit);
 790                                 break;
 791                         case 4:
 792                                 ideapad_backlight_notify_brightness(priv);
 793                                 break;
 794                         case 3:
 795                                 ideapad_input_novokey(priv);
 796                                 break;
 797                         case 2:
 798                                 ideapad_backlight_notify_power(priv);
 799                                 break;
 800                         default:
 801                                 pr_info("Unknown event: %lu\n", vpc_bit);
 802                         }
 803                 }
 804         }
 805 }
 806
 807 static struct acpi_driver ideapad_acpi_driver = {
 808         .name = "ideapad_acpi",
 809         .class = "IdeaPad",
 810         .ids = ideapad_device_ids,
 811         .ops.add = ideapad_acpi_add,
 812         .ops.remove = ideapad_acpi_remove,
 813         .ops.notify = ideapad_acpi_notify,
 814         .owner = THIS_MODULE,
 815 };
 816
 817 static int __init ideapad_acpi_module_init(void)
 818 {
 819         return acpi_bus_register_driver(&ideapad_acpi_driver);
 820 }
 821
 822 static void __exit ideapad_acpi_module_exit(void)
 823 {
 824         acpi_bus_unregister_driver(&ideapad_acpi_driver);
 825 }
 826
 827 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 828 MODULE_DESCRIPTION("IdeaPad ACPI Extras");
 829 MODULE_LICENSE("GPL");
 830
 831 module_init(ideapad_acpi_module_init);
 832 module_exit(ideapad_acpi_module_exit);