drivers/mfd/htc-i2cpld.c

   1 /*
   2  *  htc-i2cpld.c
   3  *  Chip driver for an unknown CPLD chip found on omap850 HTC devices like
   4  *  the HTC Wizard and HTC Herald.
   5  *  The cpld is located on the i2c bus and acts as an input/output GPIO
   6  *  extender.
   7  *
   8  *  Copyright (C) 2009 Cory Maccarrone <darkstar6262@gmail.com>
   9  *
  10  *  Based on work done in the linwizard project
  11  *  Copyright (C) 2008-2009 Angelo Arrifano <miknix@gmail.com>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/init.h>
  30 #include <linux/module.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/i2c.h>
  34 #include <linux/irq.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/htcpld.h>
  37 #include <linux/gpio.h>
  38 #include <linux/slab.h>
  39
  40 struct htcpld_chip {
  41         spinlock_t              lock;
  42
  43         /* chip info */
  44         u8                      reset;
  45         u8                      addr;
  46         struct device           *dev;
  47         struct i2c_client       *client;
  48
  49         /* Output details */
  50         u8                      cache_out;
  51         struct gpio_chip        chip_out;
  52
  53         /* Input details */
  54         u8                      cache_in;
  55         struct gpio_chip        chip_in;
  56
  57         u16                     irqs_enabled;
  58         uint                    irq_start;
  59         int                     nirqs;
  60
  61         unsigned int            flow_type;
  62         /*
  63          * Work structure to allow for setting values outside of any
  64          * possible interrupt context
  65          */
  66         struct work_struct set_val_work;
  67 };
  68
  69 struct htcpld_data {
  70         /* irq info */
  71         u16                irqs_enabled;
  72         uint               irq_start;
  73         int                nirqs;
  74         uint               chained_irq;
  75         unsigned int       int_reset_gpio_hi;
  76         unsigned int       int_reset_gpio_lo;
  77
  78         /* htcpld info */
  79         struct htcpld_chip *chip;
  80         unsigned int       nchips;
  81 };
  82
  83 /* There does not appear to be a way to proactively mask interrupts
  84  * on the htcpld chip itself.  So, we simply ignore interrupts that
  85  * aren't desired. */
  86 static void htcpld_mask(struct irq_data *data)
  87 {
  88         struct htcpld_chip *chip = irq_data_get_irq_chip_data(data);
  89         chip->irqs_enabled &= ~(1 << (data->irq - chip->irq_start));
  90         pr_debug("HTCPLD mask %d %04x\n", data->irq, chip->irqs_enabled);
  91 }
  92 static void htcpld_unmask(struct irq_data *data)
  93 {
  94         struct htcpld_chip *chip = irq_data_get_irq_chip_data(data);
  95         chip->irqs_enabled |= 1 << (data->irq - chip->irq_start);
  96         pr_debug("HTCPLD unmask %d %04x\n", data->irq, chip->irqs_enabled);
  97 }
  98
  99 static int htcpld_set_type(struct irq_data *data, unsigned int flags)
 100 {
 101         struct htcpld_chip *chip = irq_data_get_irq_chip_data(data);
 102
 103         if (flags & ~IRQ_TYPE_SENSE_MASK)
 104                 return -EINVAL;
 105
 106         /* We only allow edge triggering */
 107         if (flags & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH))
 108                 return -EINVAL;
 109
 110         chip->flow_type = flags;
 111         return 0;
 112 }
 113
 114 static struct irq_chip htcpld_muxed_chip = {
 115         .name         = "htcpld",
 116         .irq_mask     = htcpld_mask,
 117         .irq_unmask   = htcpld_unmask,
 118         .irq_set_type = htcpld_set_type,
 119 };
 120
 121 /* To properly dispatch IRQ events, we need to read from the
 122  * chip.  This is an I2C action that could possibly sleep
 123  * (which is bad in interrupt context) -- so we use a threaded
 124  * interrupt handler to get around that.
 125  */
 126 static irqreturn_t htcpld_handler(int irq, void *dev)
 127 {
 128         struct htcpld_data *htcpld = dev;
 129         unsigned int i;
 130         unsigned long flags;
 131         int irqpin;
 132
 133         if (!htcpld) {
 134                 pr_debug("htcpld is null in ISR\n");
 135                 return IRQ_HANDLED;
 136         }
 137
 138         /*
 139          * For each chip, do a read of the chip and trigger any interrupts
 140          * desired.  The interrupts will be triggered from LSB to MSB (i.e.
 141          * bit 0 first, then bit 1, etc.)
 142          *
 143          * For chips that have no interrupt range specified, just skip 'em.
 144          */
 145         for (i = 0; i < htcpld->nchips; i++) {
 146                 struct htcpld_chip *chip = &htcpld->chip[i];
 147                 struct i2c_client *client;
 148                 int val;
 149                 unsigned long uval, old_val;
 150
 151                 if (!chip) {
 152                         pr_debug("chip %d is null in ISR\n", i);
 153                         continue;
 154                 }
 155
 156                 if (chip->nirqs == 0)
 157                         continue;
 158
 159                 client = chip->client;
 160                 if (!client) {
 161                         pr_debug("client %d is null in ISR\n", i);
 162                         continue;
 163                 }
 164
 165                 /* Scan the chip */
 166                 val = i2c_smbus_read_byte_data(client, chip->cache_out);
 167                 if (val < 0) {
 168                         /* Throw a warning and skip this chip */
 169                         dev_warn(chip->dev, "Unable to read from chip: %d\n",
 170                                  val);
 171                         continue;
 172                 }
 173
 174                 uval = (unsigned long)val;
 175
 176                 spin_lock_irqsave(&chip->lock, flags);
 177
 178                 /* Save away the old value so we can compare it */
 179                 old_val = chip->cache_in;
 180
 181                 /* Write the new value */
 182                 chip->cache_in = uval;
 183
 184                 spin_unlock_irqrestore(&chip->lock, flags);
 185
 186                 /*
 187                  * For each bit in the data (starting at bit 0), trigger
 188                  * associated interrupts.
 189                  */
 190                 for (irqpin = 0; irqpin < chip->nirqs; irqpin++) {
 191                         unsigned oldb, newb, type = chip->flow_type;
 192
 193                         irq = chip->irq_start + irqpin;
 194
 195                         /* Run the IRQ handler, but only if the bit value
 196                          * changed, and the proper flags are set */
 197                         oldb = (old_val >> irqpin) & 1;
 198                         newb = (uval >> irqpin) & 1;
 199
 200                         if ((!oldb && newb && (type & IRQ_TYPE_EDGE_RISING)) ||
 201                             (oldb && !newb && (type & IRQ_TYPE_EDGE_FALLING))) {
 202                                 pr_debug("fire IRQ %d\n", irqpin);
 203                                 generic_handle_irq(irq);
 204                         }
 205                 }
 206         }
 207
 208         /*
 209          * In order to continue receiving interrupts, the int_reset_gpio must
 210          * be asserted.
 211          */
 212         if (htcpld->int_reset_gpio_hi)
 213                 gpio_set_value(htcpld->int_reset_gpio_hi, 1);
 214         if (htcpld->int_reset_gpio_lo)
 215                 gpio_set_value(htcpld->int_reset_gpio_lo, 0);
 216
 217         return IRQ_HANDLED;
 218 }
 219
 220 /*
 221  * The GPIO set routines can be called from interrupt context, especially if,
 222  * for example they're attached to the led-gpio framework and a trigger is
 223  * enabled.  As such, we declared work above in the htcpld_chip structure,
 224  * and that work is scheduled in the set routine.  The kernel can then run
 225  * the I2C functions, which will sleep, in process context.
 226  */
 227 static void htcpld_chip_set(struct gpio_chip *chip, unsigned offset, int val)
 228 {
 229         struct i2c_client *client;
 230         struct htcpld_chip *chip_data;
 231         unsigned long flags;
 232
 233         chip_data = container_of(chip, struct htcpld_chip, chip_out);
 234         if (!chip_data)
 235                 return;
 236
 237         client = chip_data->client;
 238         if (client == NULL)
 239                 return;
 240
 241         spin_lock_irqsave(&chip_data->lock, flags);
 242         if (val)
 243                 chip_data->cache_out |= (1 << offset);
 244         else
 245                 chip_data->cache_out &= ~(1 << offset);
 246         spin_unlock_irqrestore(&chip_data->lock, flags);
 247
 248         schedule_work(&(chip_data->set_val_work));
 249 }
 250
 251 static void htcpld_chip_set_ni(struct work_struct *work)
 252 {
 253         struct htcpld_chip *chip_data;
 254         struct i2c_client *client;
 255
 256         chip_data = container_of(work, struct htcpld_chip, set_val_work);
 257         client = chip_data->client;
 258         i2c_smbus_read_byte_data(client, chip_data->cache_out);
 259 }
 260
 261 static int htcpld_chip_get(struct gpio_chip *chip, unsigned offset)
 262 {
 263         struct htcpld_chip *chip_data;
 264         int val = 0;
 265         int is_input = 0;
 266
 267         /* Try out first */
 268         chip_data = container_of(chip, struct htcpld_chip, chip_out);
 269         if (!chip_data) {
 270                 /* Try in */
 271                 is_input = 1;
 272                 chip_data = container_of(chip, struct htcpld_chip, chip_in);
 273                 if (!chip_data)
 274                         return -EINVAL;
 275         }
 276
 277         /* Determine if this is an input or output GPIO */
 278         if (!is_input)
 279                 /* Use the output cache */
 280                 val = (chip_data->cache_out >> offset) & 1;
 281         else
 282                 /* Use the input cache */
 283                 val = (chip_data->cache_in >> offset) & 1;
 284
 285         if (val)
 286                 return 1;
 287         else
 288                 return 0;
 289 }
 290
 291 static int htcpld_direction_output(struct gpio_chip *chip,
 292                                         unsigned offset, int value)
 293 {
 294         htcpld_chip_set(chip, offset, value);
 295         return 0;
 296 }
 297
 298 static int htcpld_direction_input(struct gpio_chip *chip,
 299                                         unsigned offset)
 300 {
 301         /*
 302          * No-op: this function can only be called on the input chip.
 303          * We do however make sure the offset is within range.
 304          */
 305         return (offset < chip->ngpio) ? 0 : -EINVAL;
 306 }
 307
 308 static int htcpld_chip_to_irq(struct gpio_chip *chip, unsigned offset)
 309 {
 310         struct htcpld_chip *chip_data;
 311
 312         chip_data = container_of(chip, struct htcpld_chip, chip_in);
 313
 314         if (offset < chip_data->nirqs)
 315                 return chip_data->irq_start + offset;
 316         else
 317                 return -EINVAL;
 318 }
 319
 320 static void htcpld_chip_reset(struct i2c_client *client)
 321 {
 322         struct htcpld_chip *chip_data = i2c_get_clientdata(client);
 323         if (!chip_data)
 324                 return;
 325
 326         i2c_smbus_read_byte_data(
 327                 client, (chip_data->cache_out = chip_data->reset));
 328 }
 329
 330 static int __devinit htcpld_setup_chip_irq(
 331                 struct platform_device *pdev,
 332                 int chip_index)
 333 {
 334         struct htcpld_data *htcpld;
 335         struct device *dev = &pdev->dev;
 336         struct htcpld_core_platform_data *pdata;
 337         struct htcpld_chip *chip;
 338         struct htcpld_chip_platform_data *plat_chip_data;
 339         unsigned int irq, irq_end;
 340         int ret = 0;
 341
 342         /* Get the platform and driver data */
 343         pdata = dev->platform_data;
 344         htcpld = platform_get_drvdata(pdev);
 345         chip = &htcpld->chip[chip_index];
 346         plat_chip_data = &pdata->chip[chip_index];
 347
 348         /* Setup irq handlers */
 349         irq_end = chip->irq_start + chip->nirqs;
 350         for (irq = chip->irq_start; irq < irq_end; irq++) {
 351                 irq_set_chip_and_handler(irq, &htcpld_muxed_chip,
 352                                          handle_simple_irq);
 353                 irq_set_chip_data(irq, chip);
 354 #ifdef CONFIG_ARM
 355                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 356 #else
 357                 irq_set_probe(irq);
 358 #endif
 359         }
 360
 361         return ret;
 362 }
 363
 364 static int __devinit htcpld_register_chip_i2c(
 365                 struct platform_device *pdev,
 366                 int chip_index)
 367 {
 368         struct htcpld_data *htcpld;
 369         struct device *dev = &pdev->dev;
 370         struct htcpld_core_platform_data *pdata;
 371         struct htcpld_chip *chip;
 372         struct htcpld_chip_platform_data *plat_chip_data;
 373         struct i2c_adapter *adapter;
 374         struct i2c_client *client;
 375         struct i2c_board_info info;
 376
 377         /* Get the platform and driver data */
 378         pdata = dev->platform_data;
 379         htcpld = platform_get_drvdata(pdev);
 380         chip = &htcpld->chip[chip_index];
 381         plat_chip_data = &pdata->chip[chip_index];
 382
 383         adapter = i2c_get_adapter(pdata->i2c_adapter_id);
 384         if (adapter == NULL) {
 385                 /* Eek, no such I2C adapter!  Bail out. */
 386                 dev_warn(dev, "Chip at i2c address 0x%x: Invalid i2c adapter %d\n",
 387                          plat_chip_data->addr, pdata->i2c_adapter_id);
 388                 return -ENODEV;
 389         }
 390
 391         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA)) {
 392                 dev_warn(dev, "i2c adapter %d non-functional\n",
 393                          pdata->i2c_adapter_id);
 394                 return -EINVAL;
 395         }
 396
 397         memset(&info, 0, sizeof(struct i2c_board_info));
 398         info.addr = plat_chip_data->addr;
 399         strlcpy(info.type, "htcpld-chip", I2C_NAME_SIZE);
 400         info.platform_data = chip;
 401
 402         /* Add the I2C device.  This calls the probe() function. */
 403         client = i2c_new_device(adapter, &info);
 404         if (!client) {
 405                 /* I2C device registration failed, contineu with the next */
 406                 dev_warn(dev, "Unable to add I2C device for 0x%x\n",
 407                          plat_chip_data->addr);
 408                 return -ENODEV;
 409         }
 410
 411         i2c_set_clientdata(client, chip);
 412         snprintf(client->name, I2C_NAME_SIZE, "Chip_0x%d", client->addr);
 413         chip->client = client;
 414
 415         /* Reset the chip */
 416         htcpld_chip_reset(client);
 417         chip->cache_in = i2c_smbus_read_byte_data(client, chip->cache_out);
 418
 419         return 0;
 420 }
 421
 422 static void __devinit htcpld_unregister_chip_i2c(
 423                 struct platform_device *pdev,
 424                 int chip_index)
 425 {
 426         struct htcpld_data *htcpld;
 427         struct htcpld_chip *chip;
 428
 429         /* Get the platform and driver data */
 430         htcpld = platform_get_drvdata(pdev);
 431         chip = &htcpld->chip[chip_index];
 432
 433         if (chip->client)
 434                 i2c_unregister_device(chip->client);
 435 }
 436
 437 static int __devinit htcpld_register_chip_gpio(
 438                 struct platform_device *pdev,
 439                 int chip_index)
 440 {
 441         struct htcpld_data *htcpld;
 442         struct device *dev = &pdev->dev;
 443         struct htcpld_core_platform_data *pdata;
 444         struct htcpld_chip *chip;
 445         struct htcpld_chip_platform_data *plat_chip_data;
 446         struct gpio_chip *gpio_chip;
 447         int ret = 0;
 448
 449         /* Get the platform and driver data */
 450         pdata = dev->platform_data;
 451         htcpld = platform_get_drvdata(pdev);
 452         chip = &htcpld->chip[chip_index];
 453         plat_chip_data = &pdata->chip[chip_index];
 454
 455         /* Setup the GPIO chips */
 456         gpio_chip = &(chip->chip_out);
 457         gpio_chip->label           = "htcpld-out";
 458         gpio_chip->dev             = dev;
 459         gpio_chip->owner           = THIS_MODULE;
 460         gpio_chip->get             = htcpld_chip_get;
 461         gpio_chip->set             = htcpld_chip_set;
 462         gpio_chip->direction_input = NULL;
 463         gpio_chip->direction_output = htcpld_direction_output;
 464         gpio_chip->base            = plat_chip_data->gpio_out_base;
 465         gpio_chip->ngpio           = plat_chip_data->num_gpios;
 466
 467         gpio_chip = &(chip->chip_in);
 468         gpio_chip->label           = "htcpld-in";
 469         gpio_chip->dev             = dev;
 470         gpio_chip->owner           = THIS_MODULE;
 471         gpio_chip->get             = htcpld_chip_get;
 472         gpio_chip->set             = NULL;
 473         gpio_chip->direction_input = htcpld_direction_input;
 474         gpio_chip->direction_output = NULL;
 475         gpio_chip->to_irq          = htcpld_chip_to_irq;
 476         gpio_chip->base            = plat_chip_data->gpio_in_base;
 477         gpio_chip->ngpio           = plat_chip_data->num_gpios;
 478
 479         /* Add the GPIO chips */
 480         ret = gpiochip_add(&(chip->chip_out));
 481         if (ret) {
 482                 dev_warn(dev, "Unable to register output GPIOs for 0x%x: %d\n",
 483                          plat_chip_data->addr, ret);
 484                 return ret;
 485         }
 486
 487         ret = gpiochip_add(&(chip->chip_in));
 488         if (ret) {
 489                 int error;
 490
 491                 dev_warn(dev, "Unable to register input GPIOs for 0x%x: %d\n",
 492                          plat_chip_data->addr, ret);
 493
 494                 error = gpiochip_remove(&(chip->chip_out));
 495                 if (error)
 496                         dev_warn(dev, "Error while trying to unregister gpio chip: %d\n", error);
 497
 498                 return ret;
 499         }
 500
 501         return 0;
 502 }
 503
 504 static int __devinit htcpld_setup_chips(struct platform_device *pdev)
 505 {
 506         struct htcpld_data *htcpld;
 507         struct device *dev = &pdev->dev;
 508         struct htcpld_core_platform_data *pdata;
 509         int i;
 510
 511         /* Get the platform and driver data */
 512         pdata = dev->platform_data;
 513         htcpld = platform_get_drvdata(pdev);
 514
 515         /* Setup each chip's output GPIOs */
 516         htcpld->nchips = pdata->num_chip;
 517         htcpld->chip = kzalloc(sizeof(struct htcpld_chip) * htcpld->nchips,
 518                                GFP_KERNEL);
 519         if (!htcpld->chip) {
 520                 dev_warn(dev, "Unable to allocate memory for chips\n");
 521                 return -ENOMEM;
 522         }
 523
 524         /* Add the chips as best we can */
 525         for (i = 0; i < htcpld->nchips; i++) {
 526                 int ret;
 527
 528                 /* Setup the HTCPLD chips */
 529                 htcpld->chip[i].reset = pdata->chip[i].reset;
 530                 htcpld->chip[i].cache_out = pdata->chip[i].reset;
 531                 htcpld->chip[i].cache_in = 0;
 532                 htcpld->chip[i].dev = dev;
 533                 htcpld->chip[i].irq_start = pdata->chip[i].irq_base;
 534                 htcpld->chip[i].nirqs = pdata->chip[i].num_irqs;
 535
 536                 INIT_WORK(&(htcpld->chip[i].set_val_work), &htcpld_chip_set_ni);
 537                 spin_lock_init(&(htcpld->chip[i].lock));
 538
 539                 /* Setup the interrupts for the chip */
 540                 if (htcpld->chained_irq) {
 541                         ret = htcpld_setup_chip_irq(pdev, i);
 542                         if (ret)
 543                                 continue;
 544                 }
 545
 546                 /* Register the chip with I2C */
 547                 ret = htcpld_register_chip_i2c(pdev, i);
 548                 if (ret)
 549                         continue;
 550
 551
 552                 /* Register the chips with the GPIO subsystem */
 553                 ret = htcpld_register_chip_gpio(pdev, i);
 554                 if (ret) {
 555                         /* Unregister the chip from i2c and continue */
 556                         htcpld_unregister_chip_i2c(pdev, i);
 557                         continue;
 558                 }
 559
 560                 dev_info(dev, "Registered chip at 0x%x\n", pdata->chip[i].addr);
 561         }
 562
 563         return 0;
 564 }
 565
 566 static int __devinit htcpld_core_probe(struct platform_device *pdev)
 567 {
 568         struct htcpld_data *htcpld;
 569         struct device *dev = &pdev->dev;
 570         struct htcpld_core_platform_data *pdata;
 571         struct resource *res;
 572         int ret = 0;
 573
 574         if (!dev)
 575                 return -ENODEV;
 576
 577         pdata = dev->platform_data;
 578         if (!pdata) {
 579                 dev_warn(dev, "Platform data not found for htcpld core!\n");
 580                 return -ENXIO;
 581         }
 582
 583         htcpld = kzalloc(sizeof(struct htcpld_data), GFP_KERNEL);
 584         if (!htcpld)
 585                 return -ENOMEM;
 586
 587         /* Find chained irq */
 588         ret = -EINVAL;
 589         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 590         if (res) {
 591                 int flags;
 592                 htcpld->chained_irq = res->start;
 593
 594                 /* Setup the chained interrupt handler */
 595                 flags = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING;
 596                 ret = request_threaded_irq(htcpld->chained_irq,
 597                                            NULL, htcpld_handler,
 598                                            flags, pdev->name, htcpld);
 599                 if (ret) {
 600                         dev_warn(dev, "Unable to setup chained irq handler: %d\n", ret);
 601                         goto fail;
 602                 } else
 603                         device_init_wakeup(dev, 0);
 604         }
 605
 606         /* Set the driver data */
 607         platform_set_drvdata(pdev, htcpld);
 608
 609         /* Setup the htcpld chips */
 610         ret = htcpld_setup_chips(pdev);
 611         if (ret)
 612                 goto fail;
 613
 614         /* Request the GPIO(s) for the int reset and set them up */
 615         if (pdata->int_reset_gpio_hi) {
 616                 ret = gpio_request(pdata->int_reset_gpio_hi, "htcpld-core");
 617                 if (ret) {
 618                         /*
 619                          * If it failed, that sucks, but we can probably
 620                          * continue on without it.
 621                          */
 622                         dev_warn(dev, "Unable to request int_reset_gpio_hi -- interrupts may not work\n");
 623                         htcpld->int_reset_gpio_hi = 0;
 624                 } else {
 625                         htcpld->int_reset_gpio_hi = pdata->int_reset_gpio_hi;
 626                         gpio_set_value(htcpld->int_reset_gpio_hi, 1);
 627                 }
 628         }
 629
 630         if (pdata->int_reset_gpio_lo) {
 631                 ret = gpio_request(pdata->int_reset_gpio_lo, "htcpld-core");
 632                 if (ret) {
 633                         /*
 634                          * If it failed, that sucks, but we can probably
 635                          * continue on without it.
 636                          */
 637                         dev_warn(dev, "Unable to request int_reset_gpio_lo -- interrupts may not work\n");
 638                         htcpld->int_reset_gpio_lo = 0;
 639                 } else {
 640                         htcpld->int_reset_gpio_lo = pdata->int_reset_gpio_lo;
 641                         gpio_set_value(htcpld->int_reset_gpio_lo, 0);
 642                 }
 643         }
 644
 645         dev_info(dev, "Initialized successfully\n");
 646         return 0;
 647
 648 fail:
 649         kfree(htcpld);
 650         return ret;
 651 }
 652
 653 /* The I2C Driver -- used internally */
 654 static const struct i2c_device_id htcpld_chip_id[] = {
 655         { "htcpld-chip", 0 },
 656         { }
 657 };
 658 MODULE_DEVICE_TABLE(i2c, htcpld_chip_id);
 659
 660
 661 static struct i2c_driver htcpld_chip_driver = {
 662         .driver = {
 663                 .name   = "htcpld-chip",
 664         },
 665         .id_table = htcpld_chip_id,
 666 };
 667
 668 /* The Core Driver */
 669 static struct platform_driver htcpld_core_driver = {
 670         .driver = {
 671                 .name = "i2c-htcpld",
 672         },
 673 };
 674
 675 static int __init htcpld_core_init(void)
 676 {
 677         int ret;
 678
 679         /* Register the I2C Chip driver */
 680         ret = i2c_add_driver(&htcpld_chip_driver);
 681         if (ret)
 682                 return ret;
 683
 684         /* Probe for our chips */
 685         return platform_driver_probe(&htcpld_core_driver, htcpld_core_probe);
 686 }
 687
 688 static void __exit htcpld_core_exit(void)
 689 {
 690         i2c_del_driver(&htcpld_chip_driver);
 691         platform_driver_unregister(&htcpld_core_driver);
 692 }
 693
 694 module_init(htcpld_core_init);
 695 module_exit(htcpld_core_exit);
 696
 697 MODULE_AUTHOR("Cory Maccarrone <darkstar6262@gmail.com>");
 698 MODULE_DESCRIPTION("I2C HTC PLD Driver");
 699 MODULE_LICENSE("GPL");
 700