Pileus Git - ~andy/linux/blob - drivers/mfd/kempld-core.c

   1 /*
   2  * Kontron PLD MFD core driver
   3  *
   4  * Copyright (c) 2010-2013 Kontron Europe GmbH
   5  * Author: Michael Brunner <michael.brunner@kontron.com>
   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 2 as published
   9  * by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/platform_device.h>
  18 #include <linux/mfd/core.h>
  19 #include <linux/mfd/kempld.h>
  20 #include <linux/module.h>
  21 #include <linux/dmi.h>
  22 #include <linux/io.h>
  23 #include <linux/delay.h>
  24
  25 #define MAX_ID_LEN 4
  26 static char force_device_id[MAX_ID_LEN + 1] = "";
  27 module_param_string(force_device_id, force_device_id, sizeof(force_device_id), 0);
  28 MODULE_PARM_DESC(force_device_id, "Override detected product");
  29
  30 /*
  31  * Get hardware mutex to block firmware from accessing the pld.
  32  * It is possible for the firmware may hold the mutex for an extended length of
  33  * time. This function will block until access has been granted.
  34  */
  35 static void kempld_get_hardware_mutex(struct kempld_device_data *pld)
  36 {
  37         /* The mutex bit will read 1 until access has been granted */
  38         while (ioread8(pld->io_index) & KEMPLD_MUTEX_KEY)
  39                 msleep(1);
  40 }
  41
  42 static void kempld_release_hardware_mutex(struct kempld_device_data *pld)
  43 {
  44         /* The harware mutex is released when 1 is written to the mutex bit. */
  45         iowrite8(KEMPLD_MUTEX_KEY, pld->io_index);
  46 }
  47
  48 static int kempld_get_info_generic(struct kempld_device_data *pld)
  49 {
  50         u16 version;
  51         u8 spec;
  52
  53         kempld_get_mutex(pld);
  54
  55         version = kempld_read16(pld, KEMPLD_VERSION);
  56         spec = kempld_read8(pld, KEMPLD_SPEC);
  57         pld->info.buildnr = kempld_read16(pld, KEMPLD_BUILDNR);
  58
  59         pld->info.minor = KEMPLD_VERSION_GET_MINOR(version);
  60         pld->info.major = KEMPLD_VERSION_GET_MAJOR(version);
  61         pld->info.number = KEMPLD_VERSION_GET_NUMBER(version);
  62         pld->info.type = KEMPLD_VERSION_GET_TYPE(version);
  63
  64         if (spec == 0xff) {
  65                 pld->info.spec_minor = 0;
  66                 pld->info.spec_major = 1;
  67         } else {
  68                 pld->info.spec_minor = KEMPLD_SPEC_GET_MINOR(spec);
  69                 pld->info.spec_major = KEMPLD_SPEC_GET_MAJOR(spec);
  70         }
  71
  72         if (pld->info.spec_major > 0)
  73                 pld->feature_mask = kempld_read16(pld, KEMPLD_FEATURE);
  74         else
  75                 pld->feature_mask = 0;
  76
  77         kempld_release_mutex(pld);
  78
  79         return 0;
  80 }
  81
  82 enum kempld_cells {
  83         KEMPLD_I2C = 0,
  84         KEMPLD_WDT,
  85         KEMPLD_GPIO,
  86         KEMPLD_UART,
  87 };
  88
  89 static struct mfd_cell kempld_devs[] = {
  90         [KEMPLD_I2C] = {
  91                 .name = "kempld-i2c",
  92         },
  93         [KEMPLD_WDT] = {
  94                 .name = "kempld-wdt",
  95         },
  96         [KEMPLD_GPIO] = {
  97                 .name = "kempld-gpio",
  98         },
  99         [KEMPLD_UART] = {
 100                 .name = "kempld-uart",
 101         },
 102 };
 103
 104 #define KEMPLD_MAX_DEVS ARRAY_SIZE(kempld_devs)
 105
 106 static int kempld_register_cells_generic(struct kempld_device_data *pld)
 107 {
 108         struct mfd_cell devs[KEMPLD_MAX_DEVS];
 109         int i = 0;
 110
 111         if (pld->feature_mask & KEMPLD_FEATURE_BIT_I2C)
 112                 devs[i++] = kempld_devs[KEMPLD_I2C];
 113
 114         if (pld->feature_mask & KEMPLD_FEATURE_BIT_WATCHDOG)
 115                 devs[i++] = kempld_devs[KEMPLD_WDT];
 116
 117         if (pld->feature_mask & KEMPLD_FEATURE_BIT_GPIO)
 118                 devs[i++] = kempld_devs[KEMPLD_GPIO];
 119
 120         if (pld->feature_mask & KEMPLD_FEATURE_MASK_UART)
 121                 devs[i++] = kempld_devs[KEMPLD_UART];
 122
 123         return mfd_add_devices(pld->dev, -1, devs, i, NULL, 0, NULL);
 124 }
 125
 126 static struct resource kempld_ioresource = {
 127         .start  = KEMPLD_IOINDEX,
 128         .end    = KEMPLD_IODATA,
 129         .flags  = IORESOURCE_IO,
 130 };
 131
 132 static const struct kempld_platform_data kempld_platform_data_generic = {
 133         .pld_clock              = KEMPLD_CLK,
 134         .ioresource             = &kempld_ioresource,
 135         .get_hardware_mutex     = kempld_get_hardware_mutex,
 136         .release_hardware_mutex = kempld_release_hardware_mutex,
 137         .get_info               = kempld_get_info_generic,
 138         .register_cells         = kempld_register_cells_generic,
 139 };
 140
 141 static struct platform_device *kempld_pdev;
 142
 143 static int kempld_create_platform_device(const struct dmi_system_id *id)
 144 {
 145         struct kempld_platform_data *pdata = id->driver_data;
 146         int ret;
 147
 148         kempld_pdev = platform_device_alloc("kempld", -1);
 149         if (!kempld_pdev)
 150                 return -ENOMEM;
 151
 152         ret = platform_device_add_data(kempld_pdev, pdata, sizeof(*pdata));
 153         if (ret)
 154                 goto err;
 155
 156         ret = platform_device_add_resources(kempld_pdev, pdata->ioresource, 1);
 157         if (ret)
 158                 goto err;
 159
 160         ret = platform_device_add(kempld_pdev);
 161         if (ret)
 162                 goto err;
 163
 164         return 0;
 165 err:
 166         platform_device_put(kempld_pdev);
 167         return ret;
 168 }
 169
 170 /**
 171  * kempld_read8 - read 8 bit register
 172  * @pld: kempld_device_data structure describing the PLD
 173  * @index: register index on the chip
 174  *
 175  * kempld_get_mutex must be called prior to calling this function.
 176  */
 177 u8 kempld_read8(struct kempld_device_data *pld, u8 index)
 178 {
 179         iowrite8(index, pld->io_index);
 180         return ioread8(pld->io_data);
 181 }
 182 EXPORT_SYMBOL_GPL(kempld_read8);
 183
 184 /**
 185  * kempld_write8 - write 8 bit register
 186  * @pld: kempld_device_data structure describing the PLD
 187  * @index: register index on the chip
 188  * @data: new register value
 189  *
 190  * kempld_get_mutex must be called prior to calling this function.
 191  */
 192 void kempld_write8(struct kempld_device_data *pld, u8 index, u8 data)
 193 {
 194         iowrite8(index, pld->io_index);
 195         iowrite8(data, pld->io_data);
 196 }
 197 EXPORT_SYMBOL_GPL(kempld_write8);
 198
 199 /**
 200  * kempld_read16 - read 16 bit register
 201  * @pld: kempld_device_data structure describing the PLD
 202  * @index: register index on the chip
 203  *
 204  * kempld_get_mutex must be called prior to calling this function.
 205  */
 206 u16 kempld_read16(struct kempld_device_data *pld, u8 index)
 207 {
 208         return kempld_read8(pld, index) | kempld_read8(pld, index + 1) << 8;
 209 }
 210 EXPORT_SYMBOL_GPL(kempld_read16);
 211
 212 /**
 213  * kempld_write16 - write 16 bit register
 214  * @pld: kempld_device_data structure describing the PLD
 215  * @index: register index on the chip
 216  * @data: new register value
 217  *
 218  * kempld_get_mutex must be called prior to calling this function.
 219  */
 220 void kempld_write16(struct kempld_device_data *pld, u8 index, u16 data)
 221 {
 222         kempld_write8(pld, index, (u8)data);
 223         kempld_write8(pld, index + 1, (u8)(data >> 8));
 224 }
 225 EXPORT_SYMBOL_GPL(kempld_write16);
 226
 227 /**
 228  * kempld_read32 - read 32 bit register
 229  * @pld: kempld_device_data structure describing the PLD
 230  * @index: register index on the chip
 231  *
 232  * kempld_get_mutex must be called prior to calling this function.
 233  */
 234 u32 kempld_read32(struct kempld_device_data *pld, u8 index)
 235 {
 236         return kempld_read16(pld, index) | kempld_read16(pld, index + 2) << 16;
 237 }
 238 EXPORT_SYMBOL_GPL(kempld_read32);
 239
 240 /**
 241  * kempld_write32 - write 32 bit register
 242  * @pld: kempld_device_data structure describing the PLD
 243  * @index: register index on the chip
 244  * @data: new register value
 245  *
 246  * kempld_get_mutex must be called prior to calling this function.
 247  */
 248 void kempld_write32(struct kempld_device_data *pld, u8 index, u32 data)
 249 {
 250         kempld_write16(pld, index, (u16)data);
 251         kempld_write16(pld, index + 2, (u16)(data >> 16));
 252 }
 253 EXPORT_SYMBOL_GPL(kempld_write32);
 254
 255 /**
 256  * kempld_get_mutex - acquire PLD mutex
 257  * @pld: kempld_device_data structure describing the PLD
 258  */
 259 void kempld_get_mutex(struct kempld_device_data *pld)
 260 {
 261         struct kempld_platform_data *pdata = pld->dev->platform_data;
 262
 263         mutex_lock(&pld->lock);
 264         pdata->get_hardware_mutex(pld);
 265 }
 266 EXPORT_SYMBOL_GPL(kempld_get_mutex);
 267
 268 /**
 269  * kempld_release_mutex - release PLD mutex
 270  * @pld: kempld_device_data structure describing the PLD
 271  */
 272 void kempld_release_mutex(struct kempld_device_data *pld)
 273 {
 274         struct kempld_platform_data *pdata = pld->dev->platform_data;
 275
 276         pdata->release_hardware_mutex(pld);
 277         mutex_unlock(&pld->lock);
 278 }
 279 EXPORT_SYMBOL_GPL(kempld_release_mutex);
 280
 281 /**
 282  * kempld_get_info - update device specific information
 283  * @pld: kempld_device_data structure describing the PLD
 284  *
 285  * This function calls the configured board specific kempld_get_info_XXXX
 286  * function which is responsible for gathering information about the specific
 287  * hardware. The information is then stored within the pld structure.
 288  */
 289 static int kempld_get_info(struct kempld_device_data *pld)
 290 {
 291         struct kempld_platform_data *pdata = pld->dev->platform_data;
 292
 293         return pdata->get_info(pld);
 294 }
 295
 296 /*
 297  * kempld_register_cells - register cell drivers
 298  *
 299  * This function registers cell drivers for the detected hardware by calling
 300  * the configured kempld_register_cells_XXXX function which is responsible
 301  * to detect and register the needed cell drivers.
 302  */
 303 static int kempld_register_cells(struct kempld_device_data *pld)
 304 {
 305         struct kempld_platform_data *pdata = pld->dev->platform_data;
 306
 307         return pdata->register_cells(pld);
 308 }
 309
 310 static int kempld_detect_device(struct kempld_device_data *pld)
 311 {
 312         char *version_type;
 313         u8 index_reg;
 314         int ret;
 315
 316         mutex_lock(&pld->lock);
 317
 318         /* Check for empty IO space */
 319         index_reg = ioread8(pld->io_index);
 320         if (index_reg == 0xff && ioread8(pld->io_data) == 0xff) {
 321                 mutex_unlock(&pld->lock);
 322                 return -ENODEV;
 323         }
 324
 325         /* Release hardware mutex if aquired */
 326         if (!(index_reg & KEMPLD_MUTEX_KEY))
 327                 iowrite8(KEMPLD_MUTEX_KEY, pld->io_index);
 328
 329         mutex_unlock(&pld->lock);
 330
 331         ret = kempld_get_info(pld);
 332         if (ret)
 333                 return ret;
 334
 335         switch (pld->info.type) {
 336         case 0:
 337                 version_type = "release";
 338                 break;
 339         case 1:
 340                 version_type = "debug";
 341                 break;
 342         case 2:
 343                 version_type = "custom";
 344                 break;
 345         default:
 346                 version_type = "unspecified";
 347         }
 348
 349         dev_info(pld->dev, "Found Kontron PLD %d\n", pld->info.number);
 350         dev_info(pld->dev, "%s version %d.%d build %d, specification %d.%d\n",
 351                  version_type, pld->info.major, pld->info.minor,
 352                  pld->info.buildnr, pld->info.spec_major,
 353                  pld->info.spec_minor);
 354
 355         return kempld_register_cells(pld);
 356 }
 357
 358 static int kempld_probe(struct platform_device *pdev)
 359 {
 360         struct kempld_platform_data *pdata = pdev->dev.platform_data;
 361         struct device *dev = &pdev->dev;
 362         struct kempld_device_data *pld;
 363         struct resource *ioport;
 364         int ret;
 365
 366         pld = devm_kzalloc(dev, sizeof(*pld), GFP_KERNEL);
 367         if (!pld)
 368                 return -ENOMEM;
 369
 370         ioport = platform_get_resource(pdev, IORESOURCE_IO, 0);
 371         if (!ioport)
 372                 return -EINVAL;
 373
 374         pld->io_base = devm_ioport_map(dev, ioport->start,
 375                                         ioport->end - ioport->start);
 376         if (!pld->io_base)
 377                 return -ENOMEM;
 378
 379         pld->io_index = pld->io_base;
 380         pld->io_data = pld->io_base + 1;
 381         pld->pld_clock = pdata->pld_clock;
 382         pld->dev = dev;
 383
 384         mutex_init(&pld->lock);
 385         platform_set_drvdata(pdev, pld);
 386
 387         ret = kempld_detect_device(pld);
 388         if (ret)
 389                 return ret;
 390
 391         return 0;
 392 }
 393
 394 static int kempld_remove(struct platform_device *pdev)
 395 {
 396         struct kempld_device_data *pld = platform_get_drvdata(pdev);
 397         struct kempld_platform_data *pdata = pld->dev->platform_data;
 398
 399         mfd_remove_devices(&pdev->dev);
 400         pdata->release_hardware_mutex(pld);
 401
 402         return 0;
 403 }
 404
 405 static struct platform_driver kempld_driver = {
 406         .driver         = {
 407                 .name   = "kempld",
 408                 .owner  = THIS_MODULE,
 409         },
 410         .probe          = kempld_probe,
 411         .remove         = kempld_remove,
 412 };
 413
 414 static struct dmi_system_id __initdata kempld_dmi_table[] = {
 415         {
 416                 .ident = "CCR2",
 417                 .matches = {
 418                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 419                         DMI_MATCH(DMI_BOARD_NAME, "COMe-bIP2"),
 420                 },
 421                 .driver_data = (void *)&kempld_platform_data_generic,
 422                 .callback = kempld_create_platform_device,
 423         }, {
 424                 .ident = "CCR6",
 425                 .matches = {
 426                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 427                         DMI_MATCH(DMI_BOARD_NAME, "COMe-bIP6"),
 428                 },
 429                 .driver_data = (void *)&kempld_platform_data_generic,
 430                 .callback = kempld_create_platform_device,
 431         }, {
 432                 .ident = "CHR2",
 433                 .matches = {
 434                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 435                         DMI_MATCH(DMI_BOARD_NAME, "ETXexpress-SC T2"),
 436                 },
 437                 .driver_data = (void *)&kempld_platform_data_generic,
 438                 .callback = kempld_create_platform_device,
 439         }, {
 440                 .ident = "CHR2",
 441                 .matches = {
 442                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 443                         DMI_MATCH(DMI_BOARD_NAME, "ETXe-SC T2"),
 444                 },
 445                 .driver_data = (void *)&kempld_platform_data_generic,
 446                 .callback = kempld_create_platform_device,
 447         }, {
 448                 .ident = "CHR2",
 449                 .matches = {
 450                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 451                         DMI_MATCH(DMI_BOARD_NAME, "COMe-bSC2"),
 452                 },
 453                 .driver_data = (void *)&kempld_platform_data_generic,
 454                 .callback = kempld_create_platform_device,
 455         }, {
 456                 .ident = "CHR6",
 457                 .matches = {
 458                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 459                         DMI_MATCH(DMI_BOARD_NAME, "ETXexpress-SC T6"),
 460                 },
 461                 .driver_data = (void *)&kempld_platform_data_generic,
 462                 .callback = kempld_create_platform_device,
 463         }, {
 464                 .ident = "CHR6",
 465                 .matches = {
 466                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 467                         DMI_MATCH(DMI_BOARD_NAME, "ETXe-SC T6"),
 468                 },
 469                 .driver_data = (void *)&kempld_platform_data_generic,
 470                 .callback = kempld_create_platform_device,
 471         }, {
 472                 .ident = "CHR6",
 473                 .matches = {
 474                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 475                         DMI_MATCH(DMI_BOARD_NAME, "COMe-bSC6"),
 476                 },
 477                 .driver_data = (void *)&kempld_platform_data_generic,
 478                 .callback = kempld_create_platform_device,
 479         }, {
 480                 .ident = "CNTG",
 481                 .matches = {
 482                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 483                         DMI_MATCH(DMI_BOARD_NAME, "ETXexpress-PC"),
 484                 },
 485                 .driver_data = (void *)&kempld_platform_data_generic,
 486                 .callback = kempld_create_platform_device,
 487         }, {
 488                 .ident = "CNTG",
 489                 .matches = {
 490                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 491                         DMI_MATCH(DMI_BOARD_NAME, "COMe-bPC2"),
 492                 },
 493                 .driver_data = (void *)&kempld_platform_data_generic,
 494                 .callback = kempld_create_platform_device,
 495         }, {
 496                 .ident = "CNTX",
 497                 .matches = {
 498                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 499                         DMI_MATCH(DMI_BOARD_NAME, "PXT"),
 500                 },
 501                 .driver_data = (void *)&kempld_platform_data_generic,
 502                 .callback = kempld_create_platform_device,
 503         }, {
 504                 .ident = "FRI2",
 505                 .matches = {
 506                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 507                         DMI_MATCH(DMI_BIOS_VERSION, "FRI2"),
 508                 },
 509                 .driver_data = (void *)&kempld_platform_data_generic,
 510                 .callback = kempld_create_platform_device,
 511         }, {
 512                 .ident = "FRI2",
 513                 .matches = {
 514                         DMI_MATCH(DMI_PRODUCT_NAME, "Fish River Island II"),
 515                 },
 516                 .driver_data = (void *)&kempld_platform_data_generic,
 517                 .callback = kempld_create_platform_device,
 518         }, {
 519                 .ident = "MBR1",
 520                 .matches = {
 521                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 522                         DMI_MATCH(DMI_BOARD_NAME, "ETX-OH"),
 523                 },
 524                 .driver_data = (void *)&kempld_platform_data_generic,
 525                 .callback = kempld_create_platform_device,
 526         }, {
 527                 .ident = "NTC1",
 528                 .matches = {
 529                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 530                         DMI_MATCH(DMI_BOARD_NAME, "nanoETXexpress-TT"),
 531                 },
 532                 .driver_data = (void *)&kempld_platform_data_generic,
 533                 .callback = kempld_create_platform_device,
 534         }, {
 535                 .ident = "NTC1",
 536                 .matches = {
 537                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 538                         DMI_MATCH(DMI_BOARD_NAME, "nETXe-TT"),
 539                 },
 540                 .driver_data = (void *)&kempld_platform_data_generic,
 541                 .callback = kempld_create_platform_device,
 542         }, {
 543                 .ident = "NTC1",
 544                 .matches = {
 545                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 546                         DMI_MATCH(DMI_BOARD_NAME, "COMe-mTT"),
 547                 },
 548                 .driver_data = (void *)&kempld_platform_data_generic,
 549                 .callback = kempld_create_platform_device,
 550         }, {
 551                 .ident = "NUP1",
 552                 .matches = {
 553                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 554                         DMI_MATCH(DMI_BOARD_NAME, "COMe-mCT"),
 555                 },
 556                 .driver_data = (void *)&kempld_platform_data_generic,
 557                 .callback = kempld_create_platform_device,
 558         }, {
 559                 .ident = "UNP1",
 560                 .matches = {
 561                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 562                         DMI_MATCH(DMI_BOARD_NAME, "microETXexpress-DC"),
 563                 },
 564                 .driver_data = (void *)&kempld_platform_data_generic,
 565                 .callback = kempld_create_platform_device,
 566         }, {
 567                 .ident = "UNP1",
 568                 .matches = {
 569                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 570                         DMI_MATCH(DMI_BOARD_NAME, "COMe-cDC2"),
 571                 },
 572                 .driver_data = (void *)&kempld_platform_data_generic,
 573                 .callback = kempld_create_platform_device,
 574         }, {
 575                 .ident = "UNTG",
 576                 .matches = {
 577                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 578                         DMI_MATCH(DMI_BOARD_NAME, "microETXexpress-PC"),
 579                 },
 580                 .driver_data = (void *)&kempld_platform_data_generic,
 581                 .callback = kempld_create_platform_device,
 582         }, {
 583                 .ident = "UNTG",
 584                 .matches = {
 585                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 586                         DMI_MATCH(DMI_BOARD_NAME, "COMe-cPC2"),
 587                 },
 588                 .driver_data = (void *)&kempld_platform_data_generic,
 589                 .callback = kempld_create_platform_device,
 590         }, {
 591                 .ident = "UUP6",
 592                 .matches = {
 593                         DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
 594                         DMI_MATCH(DMI_BOARD_NAME, "COMe-cCT6"),
 595                 },
 596                 .driver_data = (void *)&kempld_platform_data_generic,
 597                 .callback = kempld_create_platform_device,
 598         },
 599         {}
 600 };
 601 MODULE_DEVICE_TABLE(dmi, kempld_dmi_table);
 602
 603 static int __init kempld_init(void)
 604 {
 605         const struct dmi_system_id *id;
 606         int ret;
 607
 608         if (force_device_id[0]) {
 609                 for (id = kempld_dmi_table; id->matches[0].slot != DMI_NONE; id++)
 610                         if (strstr(id->ident, force_device_id))
 611                                 if (id->callback && id->callback(id))
 612                                         break;
 613                 if (id->matches[0].slot == DMI_NONE)
 614                         return -ENODEV;
 615         } else {
 616                 if (!dmi_check_system(kempld_dmi_table))
 617                         return -ENODEV;
 618         }
 619
 620         ret = platform_driver_register(&kempld_driver);
 621         if (ret)
 622                 return ret;
 623
 624         return 0;
 625 }
 626
 627 static void __exit kempld_exit(void)
 628 {
 629         if (kempld_pdev)
 630                 platform_device_unregister(kempld_pdev);
 631
 632         platform_driver_unregister(&kempld_driver);
 633 }
 634
 635 module_init(kempld_init);
 636 module_exit(kempld_exit);
 637
 638 MODULE_DESCRIPTION("KEM PLD Core Driver");
 639 MODULE_AUTHOR("Michael Brunner <michael.brunner@kontron.com>");
 640 MODULE_LICENSE("GPL");
 641 MODULE_ALIAS("platform:kempld-core");