drivers/platform/chrome/chromeos_laptop.c

   1 /*
   2  *  chromeos_laptop.c - Driver to instantiate Chromebook i2c/smbus devices.
   3  *
   4  *  Author : Benson Leung <bleung@chromium.org>
   5  *
   6  *  Copyright (C) 2012 Google, Inc.
   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  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <linux/dmi.h>
  25 #include <linux/i2c.h>
  26 #include <linux/platform_data/atmel_mxt_ts.h>
  27 #include <linux/input.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/module.h>
  30 #include <linux/platform_device.h>
  31
  32 #define ATMEL_TP_I2C_ADDR       0x4b
  33 #define ATMEL_TP_I2C_BL_ADDR    0x25
  34 #define ATMEL_TS_I2C_ADDR       0x4a
  35 #define ATMEL_TS_I2C_BL_ADDR    0x26
  36 #define CYAPA_TP_I2C_ADDR       0x67
  37 #define ELAN_TP_I2C_ADDR        0x15
  38 #define ISL_ALS_I2C_ADDR        0x44
  39 #define TAOS_ALS_I2C_ADDR       0x29
  40
  41 #define MAX_I2C_DEVICE_DEFERRALS        5
  42
  43 static struct i2c_client *als;
  44 static struct i2c_client *tp;
  45 static struct i2c_client *ts;
  46
  47 static const char *i2c_adapter_names[] = {
  48         "SMBus I801 adapter",
  49         "i915 gmbus vga",
  50         "i915 gmbus panel",
  51         "Synopsys DesignWare I2C adapter",
  52         "Synopsys DesignWare I2C adapter",
  53 };
  54
  55 /* Keep this enum consistent with i2c_adapter_names */
  56 enum i2c_adapter_type {
  57         I2C_ADAPTER_SMBUS = 0,
  58         I2C_ADAPTER_VGADDC,
  59         I2C_ADAPTER_PANEL,
  60         I2C_ADAPTER_DESIGNWARE_0,
  61         I2C_ADAPTER_DESIGNWARE_1,
  62 };
  63
  64 enum i2c_peripheral_state {
  65         UNPROBED = 0,
  66         PROBED,
  67         TIMEDOUT,
  68 };
  69
  70 struct i2c_peripheral {
  71         int (*add)(enum i2c_adapter_type type);
  72         enum i2c_adapter_type type;
  73         enum i2c_peripheral_state state;
  74         int tries;
  75 };
  76
  77 #define MAX_I2C_PERIPHERALS 4
  78
  79 struct chromeos_laptop {
  80         struct i2c_peripheral i2c_peripherals[MAX_I2C_PERIPHERALS];
  81 };
  82
  83 static struct chromeos_laptop *cros_laptop;
  84
  85 static struct i2c_board_info cyapa_device = {
  86         I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
  87         .flags          = I2C_CLIENT_WAKE,
  88 };
  89
  90 static struct i2c_board_info elantech_device = {
  91         I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR),
  92         .flags          = I2C_CLIENT_WAKE,
  93 };
  94
  95 static struct i2c_board_info isl_als_device = {
  96         I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
  97 };
  98
  99 static struct i2c_board_info tsl2583_als_device = {
 100         I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
 101 };
 102
 103 static struct i2c_board_info tsl2563_als_device = {
 104         I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
 105 };
 106
 107 static int mxt_t19_keys[] = {
 108         KEY_RESERVED,
 109         KEY_RESERVED,
 110         KEY_RESERVED,
 111         KEY_RESERVED,
 112         KEY_RESERVED,
 113         BTN_LEFT
 114 };
 115
 116 static struct mxt_platform_data atmel_224s_tp_platform_data = {
 117         .irqflags               = IRQF_TRIGGER_FALLING,
 118         .t19_num_keys           = ARRAY_SIZE(mxt_t19_keys),
 119         .t19_keymap             = mxt_t19_keys,
 120         .suspend_mode           = MXT_SUSPEND_T9_CTRL,
 121 };
 122
 123 static struct i2c_board_info atmel_224s_tp_device = {
 124         I2C_BOARD_INFO("atmel_mxt_tp", ATMEL_TP_I2C_ADDR),
 125         .platform_data = &atmel_224s_tp_platform_data,
 126         .flags          = I2C_CLIENT_WAKE,
 127 };
 128
 129 static struct mxt_platform_data atmel_1664s_platform_data = {
 130         .irqflags               = IRQF_TRIGGER_FALLING,
 131         .suspend_mode           = MXT_SUSPEND_T9_CTRL,
 132 };
 133
 134 static struct i2c_board_info atmel_1664s_device = {
 135         I2C_BOARD_INFO("atmel_mxt_ts", ATMEL_TS_I2C_ADDR),
 136         .platform_data = &atmel_1664s_platform_data,
 137         .flags          = I2C_CLIENT_WAKE,
 138 };
 139
 140 static struct i2c_client *__add_probed_i2c_device(
 141                 const char *name,
 142                 int bus,
 143                 struct i2c_board_info *info,
 144                 const unsigned short *alt_addr_list)
 145 {
 146         const struct dmi_device *dmi_dev;
 147         const struct dmi_dev_onboard *dev_data;
 148         struct i2c_adapter *adapter;
 149         struct i2c_client *client = NULL;
 150         const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
 151
 152         if (bus < 0)
 153                 return NULL;
 154         /*
 155          * If a name is specified, look for irq platform information stashed
 156          * in DMI_DEV_TYPE_DEV_ONBOARD by the Chrome OS custom system firmware.
 157          */
 158         if (name) {
 159                 dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, name, NULL);
 160                 if (!dmi_dev) {
 161                         pr_err("%s failed to dmi find device %s.\n",
 162                                __func__,
 163                                name);
 164                         return NULL;
 165                 }
 166                 dev_data = (struct dmi_dev_onboard *)dmi_dev->device_data;
 167                 if (!dev_data) {
 168                         pr_err("%s failed to get data from dmi for %s.\n",
 169                                __func__, name);
 170                         return NULL;
 171                 }
 172                 info->irq = dev_data->instance;
 173         }
 174
 175         adapter = i2c_get_adapter(bus);
 176         if (!adapter) {
 177                 pr_err("%s failed to get i2c adapter %d.\n", __func__, bus);
 178                 return NULL;
 179         }
 180
 181         /*
 182          * Add the i2c device. If we can't detect it at the primary
 183          * address we scan secondary addresses. In any case the client
 184          * structure gets assigned primary address.
 185          */
 186         client = i2c_new_probed_device(adapter, info, addr_list, NULL);
 187         if (!client && alt_addr_list) {
 188                 struct i2c_board_info dummy_info = {
 189                         I2C_BOARD_INFO("dummy", info->addr),
 190                 };
 191                 struct i2c_client *dummy;
 192
 193                 dummy = i2c_new_probed_device(adapter, &dummy_info,
 194                                               alt_addr_list, NULL);
 195                 if (dummy) {
 196                         pr_debug("%s %d-%02x is probed at %02x\n",
 197                                   __func__, bus, info->addr, dummy->addr);
 198                         i2c_unregister_device(dummy);
 199                         client = i2c_new_device(adapter, info);
 200                 }
 201         }
 202
 203         if (!client)
 204                 pr_notice("%s failed to register device %d-%02x\n",
 205                           __func__, bus, info->addr);
 206         else
 207                 pr_debug("%s added i2c device %d-%02x\n",
 208                          __func__, bus, info->addr);
 209
 210         i2c_put_adapter(adapter);
 211         return client;
 212 }
 213
 214 struct i2c_lookup {
 215         const char *name;
 216         int instance;
 217         int n;
 218 };
 219
 220 static int __find_i2c_adap(struct device *dev, void *data)
 221 {
 222         struct i2c_lookup *lookup = data;
 223         static const char *prefix = "i2c-";
 224         struct i2c_adapter *adapter;
 225
 226         if (strncmp(dev_name(dev), prefix, strlen(prefix)) != 0)
 227                 return 0;
 228         adapter = to_i2c_adapter(dev);
 229         if (strncmp(adapter->name, lookup->name, strlen(lookup->name)) == 0 &&
 230             lookup->n++ == lookup->instance)
 231                 return 1;
 232         return 0;
 233 }
 234
 235 static int find_i2c_adapter_num(enum i2c_adapter_type type)
 236 {
 237         struct device *dev = NULL;
 238         struct i2c_adapter *adapter;
 239         struct i2c_lookup lookup;
 240
 241         memset(&lookup, 0, sizeof(lookup));
 242         lookup.name = i2c_adapter_names[type];
 243         lookup.instance = (type == I2C_ADAPTER_DESIGNWARE_1) ? 1 : 0;
 244
 245         /* find the adapter by name */
 246         dev = bus_find_device(&i2c_bus_type, NULL, &lookup, __find_i2c_adap);
 247         if (!dev) {
 248                 /* Adapters may appear later. Deferred probing will retry */
 249                 pr_notice("%s: i2c adapter %s not found on system.\n", __func__,
 250                           lookup.name);
 251                 return -ENODEV;
 252         }
 253         adapter = to_i2c_adapter(dev);
 254         return adapter->nr;
 255 }
 256
 257 /*
 258  * Takes a list of addresses in addrs as such :
 259  * { addr1, ... , addrn, I2C_CLIENT_END };
 260  * add_probed_i2c_device will use i2c_new_probed_device
 261  * and probe for devices at all of the addresses listed.
 262  * Returns NULL if no devices found.
 263  * See Documentation/i2c/instantiating-devices for more information.
 264  */
 265 static struct i2c_client *add_probed_i2c_device(
 266                 const char *name,
 267                 enum i2c_adapter_type type,
 268                 struct i2c_board_info *info,
 269                 const unsigned short *addrs)
 270 {
 271         return __add_probed_i2c_device(name,
 272                                        find_i2c_adapter_num(type),
 273                                        info,
 274                                        addrs);
 275 }
 276
 277 /*
 278  * Probes for a device at a single address, the one provided by
 279  * info->addr.
 280  * Returns NULL if no device found.
 281  */
 282 static struct i2c_client *add_i2c_device(const char *name,
 283                                                 enum i2c_adapter_type type,
 284                                                 struct i2c_board_info *info)
 285 {
 286         return __add_probed_i2c_device(name,
 287                                        find_i2c_adapter_num(type),
 288                                        info,
 289                                        NULL);
 290 }
 291
 292 static int setup_cyapa_tp(enum i2c_adapter_type type)
 293 {
 294         if (tp)
 295                 return 0;
 296
 297         /* add cyapa touchpad */
 298         tp = add_i2c_device("trackpad", type, &cyapa_device);
 299         return (!tp) ? -EAGAIN : 0;
 300 }
 301
 302 static int setup_atmel_224s_tp(enum i2c_adapter_type type)
 303 {
 304         const unsigned short addr_list[] = { ATMEL_TP_I2C_BL_ADDR,
 305                                              I2C_CLIENT_END };
 306         if (tp)
 307                 return 0;
 308
 309         /* add atmel mxt touchpad */
 310         tp = add_probed_i2c_device("trackpad", type,
 311                                    &atmel_224s_tp_device, addr_list);
 312         return (!tp) ? -EAGAIN : 0;
 313 }
 314
 315 static int setup_elantech_tp(enum i2c_adapter_type type)
 316 {
 317         if (tp)
 318                 return 0;
 319
 320         /* add elantech touchpad */
 321         tp = add_i2c_device("trackpad", type, &elantech_device);
 322         return (!tp) ? -EAGAIN : 0;
 323 }
 324
 325 static int setup_atmel_1664s_ts(enum i2c_adapter_type type)
 326 {
 327         const unsigned short addr_list[] = { ATMEL_TS_I2C_BL_ADDR,
 328                                              I2C_CLIENT_END };
 329         if (ts)
 330                 return 0;
 331
 332         /* add atmel mxt touch device */
 333         ts = add_probed_i2c_device("touchscreen", type,
 334                                    &atmel_1664s_device, addr_list);
 335         return (!ts) ? -EAGAIN : 0;
 336 }
 337
 338 static int setup_isl29018_als(enum i2c_adapter_type type)
 339 {
 340         if (als)
 341                 return 0;
 342
 343         /* add isl29018 light sensor */
 344         als = add_i2c_device("lightsensor", type, &isl_als_device);
 345         return (!als) ? -EAGAIN : 0;
 346 }
 347
 348 static int setup_tsl2583_als(enum i2c_adapter_type type)
 349 {
 350         if (als)
 351                 return 0;
 352
 353         /* add tsl2583 light sensor */
 354         als = add_i2c_device(NULL, type, &tsl2583_als_device);
 355         return (!als) ? -EAGAIN : 0;
 356 }
 357
 358 static int setup_tsl2563_als(enum i2c_adapter_type type)
 359 {
 360         if (als)
 361                 return 0;
 362
 363         /* add tsl2563 light sensor */
 364         als = add_i2c_device(NULL, type, &tsl2563_als_device);
 365         return (!als) ? -EAGAIN : 0;
 366 }
 367
 368 static int __init chromeos_laptop_dmi_matched(const struct dmi_system_id *id)
 369 {
 370         cros_laptop = (void *)id->driver_data;
 371         pr_debug("DMI Matched %s.\n", id->ident);
 372
 373         /* Indicate to dmi_scan that processing is done. */
 374         return 1;
 375 }
 376
 377 static int chromeos_laptop_probe(struct platform_device *pdev)
 378 {
 379         int i;
 380         int ret = 0;
 381
 382         for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
 383                 struct i2c_peripheral *i2c_dev;
 384
 385                 i2c_dev = &cros_laptop->i2c_peripherals[i];
 386
 387                 /* No more peripherals. */
 388                 if (i2c_dev->add == NULL)
 389                         break;
 390
 391                 if (i2c_dev->state == TIMEDOUT || i2c_dev->state == PROBED)
 392                         continue;
 393
 394                 /*
 395                  * Check that the i2c adapter is present.
 396                  * -EPROBE_DEFER if missing as the adapter may appear much
 397                  * later.
 398                  */
 399                 if (find_i2c_adapter_num(i2c_dev->type) == -ENODEV) {
 400                         ret = -EPROBE_DEFER;
 401                         continue;
 402                 }
 403
 404                 /* Add the device. */
 405                 if (i2c_dev->add(i2c_dev->type) == -EAGAIN) {
 406                         /*
 407                          * Set -EPROBE_DEFER a limited num of times
 408                          * if device is not successfully added.
 409                          */
 410                         if (++i2c_dev->tries < MAX_I2C_DEVICE_DEFERRALS) {
 411                                 ret = -EPROBE_DEFER;
 412                         } else {
 413                                 /* Ran out of tries. */
 414                                 pr_notice("%s: Ran out of tries for device.\n",
 415                                           __func__);
 416                                 i2c_dev->state = TIMEDOUT;
 417                         }
 418                 } else {
 419                         i2c_dev->state = PROBED;
 420                 }
 421         }
 422
 423         return ret;
 424 }
 425
 426 static struct chromeos_laptop samsung_series_5_550 = {
 427         .i2c_peripherals = {
 428                 /* Touchpad. */
 429                 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
 430                 /* Light Sensor. */
 431                 { .add = setup_isl29018_als, I2C_ADAPTER_SMBUS },
 432         },
 433 };
 434
 435 static struct chromeos_laptop samsung_series_5 = {
 436         .i2c_peripherals = {
 437                 /* Light Sensor. */
 438                 { .add = setup_tsl2583_als, I2C_ADAPTER_SMBUS },
 439         },
 440 };
 441
 442 static struct chromeos_laptop chromebook_pixel = {
 443         .i2c_peripherals = {
 444                 /* Touch Screen. */
 445                 { .add = setup_atmel_1664s_ts, I2C_ADAPTER_PANEL },
 446                 /* Touchpad. */
 447                 { .add = setup_atmel_224s_tp, I2C_ADAPTER_VGADDC },
 448                 /* Light Sensor. */
 449                 { .add = setup_isl29018_als, I2C_ADAPTER_PANEL },
 450         },
 451 };
 452
 453 static struct chromeos_laptop hp_chromebook_14 = {
 454         .i2c_peripherals = {
 455                 /* Touchpad. */
 456                 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
 457         },
 458 };
 459
 460 static struct chromeos_laptop dell_chromebook_11 = {
 461         .i2c_peripherals = {
 462                 /* Touchpad. */
 463                 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
 464                 /* Elan Touchpad option. */
 465                 { .add = setup_elantech_tp, I2C_ADAPTER_DESIGNWARE_0 },
 466         },
 467 };
 468
 469 static struct chromeos_laptop toshiba_cb35 = {
 470         .i2c_peripherals = {
 471                 /* Touchpad. */
 472                 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
 473         },
 474 };
 475
 476 static struct chromeos_laptop acer_c7_chromebook = {
 477         .i2c_peripherals = {
 478                 /* Touchpad. */
 479                 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
 480         },
 481 };
 482
 483 static struct chromeos_laptop acer_ac700 = {
 484         .i2c_peripherals = {
 485                 /* Light Sensor. */
 486                 { .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
 487         },
 488 };
 489
 490 static struct chromeos_laptop acer_c720 = {
 491         .i2c_peripherals = {
 492                 /* Touchscreen. */
 493                 { .add = setup_atmel_1664s_ts, I2C_ADAPTER_DESIGNWARE_1 },
 494                 /* Touchpad. */
 495                 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
 496                 /* Elan Touchpad option. */
 497                 { .add = setup_elantech_tp, I2C_ADAPTER_DESIGNWARE_0 },
 498                 /* Light Sensor. */
 499                 { .add = setup_isl29018_als, I2C_ADAPTER_DESIGNWARE_1 },
 500         },
 501 };
 502
 503 static struct chromeos_laptop hp_pavilion_14_chromebook = {
 504         .i2c_peripherals = {
 505                 /* Touchpad. */
 506                 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
 507         },
 508 };
 509
 510 static struct chromeos_laptop cr48 = {
 511         .i2c_peripherals = {
 512                 /* Light Sensor. */
 513                 { .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
 514         },
 515 };
 516
 517 #define _CBDD(board_) \
 518         .callback = chromeos_laptop_dmi_matched, \
 519         .driver_data = (void *)&board_
 520
 521 static const struct dmi_system_id chromeos_laptop_dmi_table[] __initconst = {
 522         {
 523                 .ident = "Samsung Series 5 550",
 524                 .matches = {
 525                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
 526                         DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
 527                 },
 528                 _CBDD(samsung_series_5_550),
 529         },
 530         {
 531                 .ident = "Samsung Series 5",
 532                 .matches = {
 533                         DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
 534                 },
 535                 _CBDD(samsung_series_5),
 536         },
 537         {
 538                 .ident = "Chromebook Pixel",
 539                 .matches = {
 540                         DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
 541                         DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
 542                 },
 543                 _CBDD(chromebook_pixel),
 544         },
 545         {
 546                 .ident = "Wolf",
 547                 .matches = {
 548                         DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
 549                         DMI_MATCH(DMI_PRODUCT_NAME, "Wolf"),
 550                 },
 551                 _CBDD(dell_chromebook_11),
 552         },
 553         {
 554                 .ident = "HP Chromebook 14",
 555                 .matches = {
 556                         DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
 557                         DMI_MATCH(DMI_PRODUCT_NAME, "Falco"),
 558                 },
 559                 _CBDD(hp_chromebook_14),
 560         },
 561         {
 562                 .ident = "Toshiba CB35",
 563                 .matches = {
 564                         DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
 565                         DMI_MATCH(DMI_PRODUCT_NAME, "Leon"),
 566                 },
 567                 _CBDD(toshiba_cb35),
 568         },
 569         {
 570                 .ident = "Acer C7 Chromebook",
 571                 .matches = {
 572                         DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
 573                 },
 574                 _CBDD(acer_c7_chromebook),
 575         },
 576         {
 577                 .ident = "Acer AC700",
 578                 .matches = {
 579                         DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
 580                 },
 581                 _CBDD(acer_ac700),
 582         },
 583         {
 584                 .ident = "Acer C720",
 585                 .matches = {
 586                         DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
 587                 },
 588                 _CBDD(acer_c720),
 589         },
 590         {
 591                 .ident = "HP Pavilion 14 Chromebook",
 592                 .matches = {
 593                         DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
 594                 },
 595                 _CBDD(hp_pavilion_14_chromebook),
 596         },
 597         {
 598                 .ident = "Cr-48",
 599                 .matches = {
 600                         DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
 601                 },
 602                 _CBDD(cr48),
 603         },
 604         { }
 605 };
 606 MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
 607
 608 static struct platform_device *cros_platform_device;
 609
 610 static struct platform_driver cros_platform_driver = {
 611         .driver = {
 612                 .name = "chromeos_laptop",
 613         },
 614         .probe = chromeos_laptop_probe,
 615 };
 616
 617 static int __init chromeos_laptop_init(void)
 618 {
 619         int ret;
 620
 621         if (!dmi_check_system(chromeos_laptop_dmi_table)) {
 622                 pr_debug("%s unsupported system.\n", __func__);
 623                 return -ENODEV;
 624         }
 625
 626         ret = platform_driver_register(&cros_platform_driver);
 627         if (ret)
 628                 return ret;
 629
 630         cros_platform_device = platform_device_alloc("chromeos_laptop", -1);
 631         if (!cros_platform_device) {
 632                 ret = -ENOMEM;
 633                 goto fail_platform_device1;
 634         }
 635
 636         ret = platform_device_add(cros_platform_device);
 637         if (ret)
 638                 goto fail_platform_device2;
 639
 640         return 0;
 641
 642 fail_platform_device2:
 643         platform_device_put(cros_platform_device);
 644 fail_platform_device1:
 645         platform_driver_unregister(&cros_platform_driver);
 646         return ret;
 647 }
 648
 649 static void __exit chromeos_laptop_exit(void)
 650 {
 651         if (als)
 652                 i2c_unregister_device(als);
 653         if (tp)
 654                 i2c_unregister_device(tp);
 655         if (ts)
 656                 i2c_unregister_device(ts);
 657
 658         platform_device_unregister(cros_platform_device);
 659         platform_driver_unregister(&cros_platform_driver);
 660 }
 661
 662 module_init(chromeos_laptop_init);
 663 module_exit(chromeos_laptop_exit);
 664
 665 MODULE_DESCRIPTION("Chrome OS Laptop driver");
 666 MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
 667 MODULE_LICENSE("GPL");