drivers/platform/x86/classmate-laptop.c

   1 /*
   2  *  Copyright (C) 2009  Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License along
  15  *  with this program; if not, write to the Free Software Foundation, Inc.,
  16  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19
  20 #include <linux/init.h>
  21 #include <linux/module.h>
  22 #include <linux/slab.h>
  23 #include <linux/workqueue.h>
  24 #include <acpi/acpi_drivers.h>
  25 #include <linux/backlight.h>
  26 #include <linux/input.h>
  27 #include <linux/rfkill.h>
  28
  29 MODULE_LICENSE("GPL");
  30
  31
  32 struct cmpc_accel {
  33         int sensitivity;
  34 };
  35
  36 #define CMPC_ACCEL_SENSITIVITY_DEFAULT          5
  37
  38
  39 #define CMPC_ACCEL_HID          "ACCE0000"
  40 #define CMPC_TABLET_HID         "TBLT0000"
  41 #define CMPC_IPML_HID   "IPML200"
  42 #define CMPC_KEYS_HID           "FnBT0000"
  43
  44 /*
  45  * Generic input device code.
  46  */
  47
  48 typedef void (*input_device_init)(struct input_dev *dev);
  49
  50 static int cmpc_add_acpi_notify_device(struct acpi_device *acpi, char *name,
  51                                        input_device_init idev_init)
  52 {
  53         struct input_dev *inputdev;
  54         int error;
  55
  56         inputdev = input_allocate_device();
  57         if (!inputdev)
  58                 return -ENOMEM;
  59         inputdev->name = name;
  60         inputdev->dev.parent = &acpi->dev;
  61         idev_init(inputdev);
  62         error = input_register_device(inputdev);
  63         if (error) {
  64                 input_free_device(inputdev);
  65                 return error;
  66         }
  67         dev_set_drvdata(&acpi->dev, inputdev);
  68         return 0;
  69 }
  70
  71 static int cmpc_remove_acpi_notify_device(struct acpi_device *acpi)
  72 {
  73         struct input_dev *inputdev = dev_get_drvdata(&acpi->dev);
  74         input_unregister_device(inputdev);
  75         return 0;
  76 }
  77
  78 /*
  79  * Accelerometer code.
  80  */
  81 static acpi_status cmpc_start_accel(acpi_handle handle)
  82 {
  83         union acpi_object param[2];
  84         struct acpi_object_list input;
  85         acpi_status status;
  86
  87         param[0].type = ACPI_TYPE_INTEGER;
  88         param[0].integer.value = 0x3;
  89         param[1].type = ACPI_TYPE_INTEGER;
  90         input.count = 2;
  91         input.pointer = param;
  92         status = acpi_evaluate_object(handle, "ACMD", &input, NULL);
  93         return status;
  94 }
  95
  96 static acpi_status cmpc_stop_accel(acpi_handle handle)
  97 {
  98         union acpi_object param[2];
  99         struct acpi_object_list input;
 100         acpi_status status;
 101
 102         param[0].type = ACPI_TYPE_INTEGER;
 103         param[0].integer.value = 0x4;
 104         param[1].type = ACPI_TYPE_INTEGER;
 105         input.count = 2;
 106         input.pointer = param;
 107         status = acpi_evaluate_object(handle, "ACMD", &input, NULL);
 108         return status;
 109 }
 110
 111 static acpi_status cmpc_accel_set_sensitivity(acpi_handle handle, int val)
 112 {
 113         union acpi_object param[2];
 114         struct acpi_object_list input;
 115
 116         param[0].type = ACPI_TYPE_INTEGER;
 117         param[0].integer.value = 0x02;
 118         param[1].type = ACPI_TYPE_INTEGER;
 119         param[1].integer.value = val;
 120         input.count = 2;
 121         input.pointer = param;
 122         return acpi_evaluate_object(handle, "ACMD", &input, NULL);
 123 }
 124
 125 static acpi_status cmpc_get_accel(acpi_handle handle,
 126                                   unsigned char *x,
 127                                   unsigned char *y,
 128                                   unsigned char *z)
 129 {
 130         union acpi_object param[2];
 131         struct acpi_object_list input;
 132         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, 0 };
 133         unsigned char *locs;
 134         acpi_status status;
 135
 136         param[0].type = ACPI_TYPE_INTEGER;
 137         param[0].integer.value = 0x01;
 138         param[1].type = ACPI_TYPE_INTEGER;
 139         input.count = 2;
 140         input.pointer = param;
 141         status = acpi_evaluate_object(handle, "ACMD", &input, &output);
 142         if (ACPI_SUCCESS(status)) {
 143                 union acpi_object *obj;
 144                 obj = output.pointer;
 145                 locs = obj->buffer.pointer;
 146                 *x = locs[0];
 147                 *y = locs[1];
 148                 *z = locs[2];
 149                 kfree(output.pointer);
 150         }
 151         return status;
 152 }
 153
 154 static void cmpc_accel_handler(struct acpi_device *dev, u32 event)
 155 {
 156         if (event == 0x81) {
 157                 unsigned char x, y, z;
 158                 acpi_status status;
 159
 160                 status = cmpc_get_accel(dev->handle, &x, &y, &z);
 161                 if (ACPI_SUCCESS(status)) {
 162                         struct input_dev *inputdev = dev_get_drvdata(&dev->dev);
 163
 164                         input_report_abs(inputdev, ABS_X, x);
 165                         input_report_abs(inputdev, ABS_Y, y);
 166                         input_report_abs(inputdev, ABS_Z, z);
 167                         input_sync(inputdev);
 168                 }
 169         }
 170 }
 171
 172 static ssize_t cmpc_accel_sensitivity_show(struct device *dev,
 173                                            struct device_attribute *attr,
 174                                            char *buf)
 175 {
 176         struct acpi_device *acpi;
 177         struct input_dev *inputdev;
 178         struct cmpc_accel *accel;
 179
 180         acpi = to_acpi_device(dev);
 181         inputdev = dev_get_drvdata(&acpi->dev);
 182         accel = dev_get_drvdata(&inputdev->dev);
 183
 184         return sprintf(buf, "%d\n", accel->sensitivity);
 185 }
 186
 187 static ssize_t cmpc_accel_sensitivity_store(struct device *dev,
 188                                             struct device_attribute *attr,
 189                                             const char *buf, size_t count)
 190 {
 191         struct acpi_device *acpi;
 192         struct input_dev *inputdev;
 193         struct cmpc_accel *accel;
 194         unsigned long sensitivity;
 195         int r;
 196
 197         acpi = to_acpi_device(dev);
 198         inputdev = dev_get_drvdata(&acpi->dev);
 199         accel = dev_get_drvdata(&inputdev->dev);
 200
 201         r = strict_strtoul(buf, 0, &sensitivity);
 202         if (r)
 203                 return r;
 204
 205         accel->sensitivity = sensitivity;
 206         cmpc_accel_set_sensitivity(acpi->handle, sensitivity);
 207
 208         return strnlen(buf, count);
 209 }
 210
 211 struct device_attribute cmpc_accel_sensitivity_attr = {
 212         .attr = { .name = "sensitivity", .mode = 0660 },
 213         .show = cmpc_accel_sensitivity_show,
 214         .store = cmpc_accel_sensitivity_store
 215 };
 216
 217 static int cmpc_accel_open(struct input_dev *input)
 218 {
 219         struct acpi_device *acpi;
 220
 221         acpi = to_acpi_device(input->dev.parent);
 222         if (ACPI_SUCCESS(cmpc_start_accel(acpi->handle)))
 223                 return 0;
 224         return -EIO;
 225 }
 226
 227 static void cmpc_accel_close(struct input_dev *input)
 228 {
 229         struct acpi_device *acpi;
 230
 231         acpi = to_acpi_device(input->dev.parent);
 232         cmpc_stop_accel(acpi->handle);
 233 }
 234
 235 static void cmpc_accel_idev_init(struct input_dev *inputdev)
 236 {
 237         set_bit(EV_ABS, inputdev->evbit);
 238         input_set_abs_params(inputdev, ABS_X, 0, 255, 8, 0);
 239         input_set_abs_params(inputdev, ABS_Y, 0, 255, 8, 0);
 240         input_set_abs_params(inputdev, ABS_Z, 0, 255, 8, 0);
 241         inputdev->open = cmpc_accel_open;
 242         inputdev->close = cmpc_accel_close;
 243 }
 244
 245 static int cmpc_accel_add(struct acpi_device *acpi)
 246 {
 247         int error;
 248         struct input_dev *inputdev;
 249         struct cmpc_accel *accel;
 250
 251         accel = kmalloc(sizeof(*accel), GFP_KERNEL);
 252         if (!accel)
 253                 return -ENOMEM;
 254
 255         accel->sensitivity = CMPC_ACCEL_SENSITIVITY_DEFAULT;
 256         cmpc_accel_set_sensitivity(acpi->handle, accel->sensitivity);
 257
 258         error = device_create_file(&acpi->dev, &cmpc_accel_sensitivity_attr);
 259         if (error)
 260                 goto failed_file;
 261
 262         error = cmpc_add_acpi_notify_device(acpi, "cmpc_accel",
 263                                             cmpc_accel_idev_init);
 264         if (error)
 265                 goto failed_input;
 266
 267         inputdev = dev_get_drvdata(&acpi->dev);
 268         dev_set_drvdata(&inputdev->dev, accel);
 269
 270         return 0;
 271
 272 failed_input:
 273         device_remove_file(&acpi->dev, &cmpc_accel_sensitivity_attr);
 274 failed_file:
 275         kfree(accel);
 276         return error;
 277 }
 278
 279 static int cmpc_accel_remove(struct acpi_device *acpi, int type)
 280 {
 281         struct input_dev *inputdev;
 282         struct cmpc_accel *accel;
 283
 284         inputdev = dev_get_drvdata(&acpi->dev);
 285         accel = dev_get_drvdata(&inputdev->dev);
 286
 287         device_remove_file(&acpi->dev, &cmpc_accel_sensitivity_attr);
 288         return cmpc_remove_acpi_notify_device(acpi);
 289 }
 290
 291 static const struct acpi_device_id cmpc_accel_device_ids[] = {
 292         {CMPC_ACCEL_HID, 0},
 293         {"", 0}
 294 };
 295
 296 static struct acpi_driver cmpc_accel_acpi_driver = {
 297         .owner = THIS_MODULE,
 298         .name = "cmpc_accel",
 299         .class = "cmpc_accel",
 300         .ids = cmpc_accel_device_ids,
 301         .ops = {
 302                 .add = cmpc_accel_add,
 303                 .remove = cmpc_accel_remove,
 304                 .notify = cmpc_accel_handler,
 305         }
 306 };
 307
 308
 309 /*
 310  * Tablet mode code.
 311  */
 312 static acpi_status cmpc_get_tablet(acpi_handle handle,
 313                                    unsigned long long *value)
 314 {
 315         union acpi_object param;
 316         struct acpi_object_list input;
 317         unsigned long long output;
 318         acpi_status status;
 319
 320         param.type = ACPI_TYPE_INTEGER;
 321         param.integer.value = 0x01;
 322         input.count = 1;
 323         input.pointer = &param;
 324         status = acpi_evaluate_integer(handle, "TCMD", &input, &output);
 325         if (ACPI_SUCCESS(status))
 326                 *value = output;
 327         return status;
 328 }
 329
 330 static void cmpc_tablet_handler(struct acpi_device *dev, u32 event)
 331 {
 332         unsigned long long val = 0;
 333         struct input_dev *inputdev = dev_get_drvdata(&dev->dev);
 334
 335         if (event == 0x81) {
 336                 if (ACPI_SUCCESS(cmpc_get_tablet(dev->handle, &val)))
 337                         input_report_switch(inputdev, SW_TABLET_MODE, !val);
 338         }
 339 }
 340
 341 static void cmpc_tablet_idev_init(struct input_dev *inputdev)
 342 {
 343         unsigned long long val = 0;
 344         struct acpi_device *acpi;
 345
 346         set_bit(EV_SW, inputdev->evbit);
 347         set_bit(SW_TABLET_MODE, inputdev->swbit);
 348
 349         acpi = to_acpi_device(inputdev->dev.parent);
 350         if (ACPI_SUCCESS(cmpc_get_tablet(acpi->handle, &val)))
 351                 input_report_switch(inputdev, SW_TABLET_MODE, !val);
 352 }
 353
 354 static int cmpc_tablet_add(struct acpi_device *acpi)
 355 {
 356         return cmpc_add_acpi_notify_device(acpi, "cmpc_tablet",
 357                                            cmpc_tablet_idev_init);
 358 }
 359
 360 static int cmpc_tablet_remove(struct acpi_device *acpi, int type)
 361 {
 362         return cmpc_remove_acpi_notify_device(acpi);
 363 }
 364
 365 static int cmpc_tablet_resume(struct acpi_device *acpi)
 366 {
 367         struct input_dev *inputdev = dev_get_drvdata(&acpi->dev);
 368         unsigned long long val = 0;
 369         if (ACPI_SUCCESS(cmpc_get_tablet(acpi->handle, &val)))
 370                 input_report_switch(inputdev, SW_TABLET_MODE, !val);
 371         return 0;
 372 }
 373
 374 static const struct acpi_device_id cmpc_tablet_device_ids[] = {
 375         {CMPC_TABLET_HID, 0},
 376         {"", 0}
 377 };
 378
 379 static struct acpi_driver cmpc_tablet_acpi_driver = {
 380         .owner = THIS_MODULE,
 381         .name = "cmpc_tablet",
 382         .class = "cmpc_tablet",
 383         .ids = cmpc_tablet_device_ids,
 384         .ops = {
 385                 .add = cmpc_tablet_add,
 386                 .remove = cmpc_tablet_remove,
 387                 .resume = cmpc_tablet_resume,
 388                 .notify = cmpc_tablet_handler,
 389         }
 390 };
 391
 392
 393 /*
 394  * Backlight code.
 395  */
 396
 397 static acpi_status cmpc_get_brightness(acpi_handle handle,
 398                                        unsigned long long *value)
 399 {
 400         union acpi_object param;
 401         struct acpi_object_list input;
 402         unsigned long long output;
 403         acpi_status status;
 404
 405         param.type = ACPI_TYPE_INTEGER;
 406         param.integer.value = 0xC0;
 407         input.count = 1;
 408         input.pointer = &param;
 409         status = acpi_evaluate_integer(handle, "GRDI", &input, &output);
 410         if (ACPI_SUCCESS(status))
 411                 *value = output;
 412         return status;
 413 }
 414
 415 static acpi_status cmpc_set_brightness(acpi_handle handle,
 416                                        unsigned long long value)
 417 {
 418         union acpi_object param[2];
 419         struct acpi_object_list input;
 420         acpi_status status;
 421         unsigned long long output;
 422
 423         param[0].type = ACPI_TYPE_INTEGER;
 424         param[0].integer.value = 0xC0;
 425         param[1].type = ACPI_TYPE_INTEGER;
 426         param[1].integer.value = value;
 427         input.count = 2;
 428         input.pointer = param;
 429         status = acpi_evaluate_integer(handle, "GWRI", &input, &output);
 430         return status;
 431 }
 432
 433 static int cmpc_bl_get_brightness(struct backlight_device *bd)
 434 {
 435         acpi_status status;
 436         acpi_handle handle;
 437         unsigned long long brightness;
 438
 439         handle = bl_get_data(bd);
 440         status = cmpc_get_brightness(handle, &brightness);
 441         if (ACPI_SUCCESS(status))
 442                 return brightness;
 443         else
 444                 return -1;
 445 }
 446
 447 static int cmpc_bl_update_status(struct backlight_device *bd)
 448 {
 449         acpi_status status;
 450         acpi_handle handle;
 451
 452         handle = bl_get_data(bd);
 453         status = cmpc_set_brightness(handle, bd->props.brightness);
 454         if (ACPI_SUCCESS(status))
 455                 return 0;
 456         else
 457                 return -1;
 458 }
 459
 460 static const struct backlight_ops cmpc_bl_ops = {
 461         .get_brightness = cmpc_bl_get_brightness,
 462         .update_status = cmpc_bl_update_status
 463 };
 464
 465 /*
 466  * RFKILL code.
 467  */
 468
 469 static acpi_status cmpc_get_rfkill_wlan(acpi_handle handle,
 470                                         unsigned long long *value)
 471 {
 472         union acpi_object param;
 473         struct acpi_object_list input;
 474         unsigned long long output;
 475         acpi_status status;
 476
 477         param.type = ACPI_TYPE_INTEGER;
 478         param.integer.value = 0xC1;
 479         input.count = 1;
 480         input.pointer = &param;
 481         status = acpi_evaluate_integer(handle, "GRDI", &input, &output);
 482         if (ACPI_SUCCESS(status))
 483                 *value = output;
 484         return status;
 485 }
 486
 487 static acpi_status cmpc_set_rfkill_wlan(acpi_handle handle,
 488                                         unsigned long long value)
 489 {
 490         union acpi_object param[2];
 491         struct acpi_object_list input;
 492         acpi_status status;
 493         unsigned long long output;
 494
 495         param[0].type = ACPI_TYPE_INTEGER;
 496         param[0].integer.value = 0xC1;
 497         param[1].type = ACPI_TYPE_INTEGER;
 498         param[1].integer.value = value;
 499         input.count = 2;
 500         input.pointer = param;
 501         status = acpi_evaluate_integer(handle, "GWRI", &input, &output);
 502         return status;
 503 }
 504
 505 static void cmpc_rfkill_query(struct rfkill *rfkill, void *data)
 506 {
 507         acpi_status status;
 508         acpi_handle handle;
 509         unsigned long long state;
 510         bool blocked;
 511
 512         handle = data;
 513         status = cmpc_get_rfkill_wlan(handle, &state);
 514         if (ACPI_SUCCESS(status)) {
 515                 blocked = state & 1 ? false : true;
 516                 rfkill_set_sw_state(rfkill, blocked);
 517         }
 518 }
 519
 520 static int cmpc_rfkill_block(void *data, bool blocked)
 521 {
 522         acpi_status status;
 523         acpi_handle handle;
 524         unsigned long long state;
 525
 526         handle = data;
 527         status = cmpc_get_rfkill_wlan(handle, &state);
 528         if (ACPI_FAILURE(status))
 529                 return -ENODEV;
 530         if (blocked)
 531                 state &= ~1;
 532         else
 533                 state |= 1;
 534         status = cmpc_set_rfkill_wlan(handle, state);
 535         if (ACPI_FAILURE(status))
 536                 return -ENODEV;
 537         return 0;
 538 }
 539
 540 static const struct rfkill_ops cmpc_rfkill_ops = {
 541         .query = cmpc_rfkill_query,
 542         .set_block = cmpc_rfkill_block,
 543 };
 544
 545 /*
 546  * Common backlight and rfkill code.
 547  */
 548
 549 struct ipml200_dev {
 550         struct backlight_device *bd;
 551         struct rfkill *rf;
 552 };
 553
 554 static int cmpc_ipml_add(struct acpi_device *acpi)
 555 {
 556         int retval;
 557         struct ipml200_dev *ipml;
 558         struct backlight_properties props;
 559
 560         ipml = kmalloc(sizeof(*ipml), GFP_KERNEL);
 561         if (ipml == NULL)
 562                 return -ENOMEM;
 563
 564         memset(&props, 0, sizeof(struct backlight_properties));
 565         props.max_brightness = 7;
 566         ipml->bd = backlight_device_register("cmpc_bl", &acpi->dev,
 567                                              acpi->handle, &cmpc_bl_ops,
 568                                              &props);
 569         if (IS_ERR(ipml->bd)) {
 570                 retval = PTR_ERR(ipml->bd);
 571                 goto out_bd;
 572         }
 573
 574         ipml->rf = rfkill_alloc("cmpc_rfkill", &acpi->dev, RFKILL_TYPE_WLAN,
 575                                 &cmpc_rfkill_ops, acpi->handle);
 576         /* rfkill_alloc may fail if RFKILL is disabled. We should still work
 577          * anyway. */
 578         if (!IS_ERR(ipml->rf)) {
 579                 retval = rfkill_register(ipml->rf);
 580                 if (retval) {
 581                         rfkill_destroy(ipml->rf);
 582                         ipml->rf = NULL;
 583                 }
 584         } else {
 585                 ipml->rf = NULL;
 586         }
 587
 588         dev_set_drvdata(&acpi->dev, ipml);
 589         return 0;
 590
 591 out_bd:
 592         kfree(ipml);
 593         return retval;
 594 }
 595
 596 static int cmpc_ipml_remove(struct acpi_device *acpi, int type)
 597 {
 598         struct ipml200_dev *ipml;
 599
 600         ipml = dev_get_drvdata(&acpi->dev);
 601
 602         backlight_device_unregister(ipml->bd);
 603
 604         if (ipml->rf) {
 605                 rfkill_unregister(ipml->rf);
 606                 rfkill_destroy(ipml->rf);
 607         }
 608
 609         kfree(ipml);
 610
 611         return 0;
 612 }
 613
 614 static const struct acpi_device_id cmpc_ipml_device_ids[] = {
 615         {CMPC_IPML_HID, 0},
 616         {"", 0}
 617 };
 618
 619 static struct acpi_driver cmpc_ipml_acpi_driver = {
 620         .owner = THIS_MODULE,
 621         .name = "cmpc",
 622         .class = "cmpc",
 623         .ids = cmpc_ipml_device_ids,
 624         .ops = {
 625                 .add = cmpc_ipml_add,
 626                 .remove = cmpc_ipml_remove
 627         }
 628 };
 629
 630
 631 /*
 632  * Extra keys code.
 633  */
 634 static int cmpc_keys_codes[] = {
 635         KEY_UNKNOWN,
 636         KEY_WLAN,
 637         KEY_SWITCHVIDEOMODE,
 638         KEY_BRIGHTNESSDOWN,
 639         KEY_BRIGHTNESSUP,
 640         KEY_VENDOR,
 641         KEY_UNKNOWN,
 642         KEY_CAMERA,
 643         KEY_BACK,
 644         KEY_FORWARD,
 645         KEY_MAX
 646 };
 647
 648 static void cmpc_keys_handler(struct acpi_device *dev, u32 event)
 649 {
 650         struct input_dev *inputdev;
 651         int code = KEY_MAX;
 652
 653         if ((event & 0x0F) < ARRAY_SIZE(cmpc_keys_codes))
 654                 code = cmpc_keys_codes[event & 0x0F];
 655         inputdev = dev_get_drvdata(&dev->dev);;
 656         input_report_key(inputdev, code, !(event & 0x10));
 657 }
 658
 659 static void cmpc_keys_idev_init(struct input_dev *inputdev)
 660 {
 661         int i;
 662
 663         set_bit(EV_KEY, inputdev->evbit);
 664         for (i = 0; cmpc_keys_codes[i] != KEY_MAX; i++)
 665                 set_bit(cmpc_keys_codes[i], inputdev->keybit);
 666 }
 667
 668 static int cmpc_keys_add(struct acpi_device *acpi)
 669 {
 670         return cmpc_add_acpi_notify_device(acpi, "cmpc_keys",
 671                                            cmpc_keys_idev_init);
 672 }
 673
 674 static int cmpc_keys_remove(struct acpi_device *acpi, int type)
 675 {
 676         return cmpc_remove_acpi_notify_device(acpi);
 677 }
 678
 679 static const struct acpi_device_id cmpc_keys_device_ids[] = {
 680         {CMPC_KEYS_HID, 0},
 681         {"", 0}
 682 };
 683
 684 static struct acpi_driver cmpc_keys_acpi_driver = {
 685         .owner = THIS_MODULE,
 686         .name = "cmpc_keys",
 687         .class = "cmpc_keys",
 688         .ids = cmpc_keys_device_ids,
 689         .ops = {
 690                 .add = cmpc_keys_add,
 691                 .remove = cmpc_keys_remove,
 692                 .notify = cmpc_keys_handler,
 693         }
 694 };
 695
 696
 697 /*
 698  * General init/exit code.
 699  */
 700
 701 static int cmpc_init(void)
 702 {
 703         int r;
 704
 705         r = acpi_bus_register_driver(&cmpc_keys_acpi_driver);
 706         if (r)
 707                 goto failed_keys;
 708
 709         r = acpi_bus_register_driver(&cmpc_ipml_acpi_driver);
 710         if (r)
 711                 goto failed_bl;
 712
 713         r = acpi_bus_register_driver(&cmpc_tablet_acpi_driver);
 714         if (r)
 715                 goto failed_tablet;
 716
 717         r = acpi_bus_register_driver(&cmpc_accel_acpi_driver);
 718         if (r)
 719                 goto failed_accel;
 720
 721         return r;
 722
 723 failed_accel:
 724         acpi_bus_unregister_driver(&cmpc_tablet_acpi_driver);
 725
 726 failed_tablet:
 727         acpi_bus_unregister_driver(&cmpc_ipml_acpi_driver);
 728
 729 failed_bl:
 730         acpi_bus_unregister_driver(&cmpc_keys_acpi_driver);
 731
 732 failed_keys:
 733         return r;
 734 }
 735
 736 static void cmpc_exit(void)
 737 {
 738         acpi_bus_unregister_driver(&cmpc_accel_acpi_driver);
 739         acpi_bus_unregister_driver(&cmpc_tablet_acpi_driver);
 740         acpi_bus_unregister_driver(&cmpc_ipml_acpi_driver);
 741         acpi_bus_unregister_driver(&cmpc_keys_acpi_driver);
 742 }
 743
 744 module_init(cmpc_init);
 745 module_exit(cmpc_exit);
 746
 747 static const struct acpi_device_id cmpc_device_ids[] = {
 748         {CMPC_ACCEL_HID, 0},
 749         {CMPC_TABLET_HID, 0},
 750         {CMPC_IPML_HID, 0},
 751         {CMPC_KEYS_HID, 0},
 752         {"", 0}
 753 };
 754
 755 MODULE_DEVICE_TABLE(acpi, cmpc_device_ids);