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         /*
  62          * Work structure to allow for setting values outside of any
  63          * possible interrupt context
  64          */
  65         struct work_struct set_val_work;
  66 };
  67
  68 struct htcpld_data {
  69         /* irq info */
  70         u16                irqs_enabled;
  71         uint               irq_start;
  72         int                nirqs;
  73         uint               chained_irq;
  74         unsigned int       int_reset_gpio_hi;
  75         unsigned int       int_reset_gpio_lo;
  76
  77         /* htcpld info */
  78         struct htcpld_chip *chip;
  79         unsigned int       nchips;
  80 };
  81
  82 /* There does not appear to be a way to proactively mask interrupts
  83  * on the htcpld chip itself.  So, we simply ignore interrupts that
  84  * aren't desired. */
  85 static void htcpld_mask(unsigned int irq)
  86 {
  87         struct htcpld_chip *chip = get_irq_chip_data(irq);
  88         chip->irqs_enabled &= ~(1 << (irq - chip->irq_start));
  89         pr_debug("HTCPLD mask %d %04x\n", irq, chip->irqs_enabled);
  90 }
  91 static void htcpld_unmask(unsigned int irq)
  92 {
  93         struct htcpld_chip *chip = get_irq_chip_data(irq);
  94         chip->irqs_enabled |= 1 << (irq - chip->irq_start);
  95         pr_debug("HTCPLD unmask %d %04x\n", irq, chip->irqs_enabled);
  96 }
  97
  98 static int htcpld_set_type(unsigned int irq, unsigned int flags)
  99 {
 100         struct irq_desc *d = irq_to_desc(irq);
 101
 102         if (!d) {
 103                 pr_err("HTCPLD invalid IRQ: %d\n", irq);
 104                 return -EINVAL;
 105         }
 106
 107         if (flags & ~IRQ_TYPE_SENSE_MASK)
 108                 return -EINVAL;
 109
 110         /* We only allow edge triggering */
 111         if (flags & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH))
 112                 return -EINVAL;
 113
 114         d->status &= ~IRQ_TYPE_SENSE_MASK;
 115         d->status |= flags;
 116
 117         return 0;
 118 }
 119
 120 static struct irq_chip htcpld_muxed_chip = {
 121         .name     = "htcpld",
 122         .mask     = htcpld_mask,
 123         .unmask   = htcpld_unmask,
 124         .set_type = htcpld_set_type,
 125 };
 126
 127 /* To properly dispatch IRQ events, we need to read from the
 128  * chip.  This is an I2C action that could possibly sleep
 129  * (which is bad in interrupt context) -- so we use a threaded
 130  * interrupt handler to get around that.
 131  */
 132 static irqreturn_t htcpld_handler(int irq, void *dev)
 133 {
 134         struct htcpld_data *htcpld = dev;
 135         unsigned int i;
 136         unsigned long flags;
 137         int irqpin;
 138         struct irq_desc *desc;
 139
 140         if (!htcpld) {
 141                 pr_debug("htcpld is null in ISR\n");
 142                 return IRQ_HANDLED;
 143         }
 144
 145         /*
 146          * For each chip, do a read of the chip and trigger any interrupts
 147          * desired.  The interrupts will be triggered from LSB to MSB (i.e.
 148          * bit 0 first, then bit 1, etc.)
 149          *
 150          * For chips that have no interrupt range specified, just skip 'em.
 151          */
 152         for (i = 0; i < htcpld->nchips; i++) {
 153                 struct htcpld_chip *chip = &htcpld->chip[i];
 154                 struct i2c_client *client;
 155                 int val;
 156                 unsigned long uval, old_val;
 157
 158                 if (!chip) {
 159                         pr_debug("chip %d is null in ISR\n", i);
 160                         continue;
 161                 }
 162
 163                 if (chip->nirqs == 0)
 164                         continue;
 165
 166                 client = chip->client;
 167                 if (!client) {
 168                         pr_debug("client %d is null in ISR\n", i);
 169                         continue;
 170                 }
 171
 172                 /* Scan the chip */
 173                 val = i2c_smbus_read_byte_data(client, chip->cache_out);
 174                 if (val < 0) {
 175                         /* Throw a warning and skip this chip */
 176                         dev_warn(chip->dev, "Unable to read from chip: %d\n",
 177                                  val);
 178                         continue;
 179                 }
 180
 181                 uval = (unsigned long)val;
 182
 183                 spin_lock_irqsave(&chip->lock, flags);
 184
 185                 /* Save away the old value so we can compare it */
 186                 old_val = chip->cache_in;
 187
 188                 /* Write the new value */
 189                 chip->cache_in = uval;
 190
 191                 spin_unlock_irqrestore(&chip->lock, flags);
 192
 193                 /*
 194                  * For each bit in the data (starting at bit 0), trigger
 195                  * associated interrupts.
 196                  */
 197                 for (irqpin = 0; irqpin < chip->nirqs; irqpin++) {
 198                         unsigned oldb, newb;
 199                         int flags;
 200
 201                         irq = chip->irq_start + irqpin;
 202                         desc = irq_to_desc(irq);
 203                         flags = desc->status;
 204
 205                         /* Run the IRQ handler, but only if the bit value
 206                          * changed, and the proper flags are set */
 207                         oldb = (old_val >> irqpin) & 1;
 208                         newb = (uval >> irqpin) & 1;
 209
 210                         if ((!oldb && newb && (flags & IRQ_TYPE_EDGE_RISING)) ||
 211                             (oldb && !newb &&
 212                              (flags & IRQ_TYPE_EDGE_FALLING))) {
 213                                 pr_debug("fire IRQ %d\n", irqpin);
 214                                 desc->handle_irq(irq, desc);
 215                         }
 216                 }
 217         }
 218
 219         /*
 220          * In order to continue receiving interrupts, the int_reset_gpio must
 221          * be asserted.
 222          */
 223         if (htcpld->int_reset_gpio_hi)
 224                 gpio_set_value(htcpld->int_reset_gpio_hi, 1);
 225         if (htcpld->int_reset_gpio_lo)
 226                 gpio_set_value(htcpld->int_reset_gpio_lo, 0);
 227
 228         return IRQ_HANDLED;
 229 }
 230
 231 /*
 232  * The GPIO set routines can be called from interrupt context, especially if,
 233  * for example they're attached to the led-gpio framework and a trigger is
 234  * enabled.  As such, we declared work above in the htcpld_chip structure,
 235  * and that work is scheduled in the set routine.  The kernel can then run
 236  * the I2C functions, which will sleep, in process context.
 237  */
 238 void htcpld_chip_set(struct gpio_chip *chip, unsigned offset, int val)
 239 {
 240         struct i2c_client *client;
 241         struct htcpld_chip *chip_data;
 242         unsigned long flags;
 243
 244         chip_data = container_of(chip, struct htcpld_chip, chip_out);
 245         if (!chip_data)
 246                 return;
 247
 248         client = chip_data->client;
 249         if (client == NULL)
 250                 return;
 251
 252         spin_lock_irqsave(&chip_data->lock, flags);
 253         if (val)
 254                 chip_data->cache_out |= (1 << offset);
 255         else
 256                 chip_data->cache_out &= ~(1 << offset);
 257         spin_unlock_irqrestore(&chip_data->lock, flags);
 258
 259         schedule_work(&(chip_data->set_val_work));
 260 }
 261
 262 void htcpld_chip_set_ni(struct work_struct *work)
 263 {
 264         struct htcpld_chip *chip_data;
 265         struct i2c_client *client;
 266
 267         chip_data = container_of(work, struct htcpld_chip, set_val_work);
 268         client = chip_data->client;
 269         i2c_smbus_read_byte_data(client, chip_data->cache_out);
 270 }
 271
 272 int htcpld_chip_get(struct gpio_chip *chip, unsigned offset)
 273 {
 274         struct htcpld_chip *chip_data;
 275         int val = 0;
 276         int is_input = 0;
 277
 278         /* Try out first */
 279         chip_data = container_of(chip, struct htcpld_chip, chip_out);
 280         if (!chip_data) {
 281                 /* Try in */
 282                 is_input = 1;
 283                 chip_data = container_of(chip, struct htcpld_chip, chip_in);
 284                 if (!chip_data)
 285                         return -EINVAL;
 286         }
 287
 288         /* Determine if this is an input or output GPIO */
 289         if (!is_input)
 290                 /* Use the output cache */
 291                 val = (chip_data->cache_out >> offset) & 1;
 292         else
 293                 /* Use the input cache */
 294                 val = (chip_data->cache_in >> offset) & 1;
 295
 296         if (val)
 297                 return 1;
 298         else
 299                 return 0;
 300 }
 301
 302 static int htcpld_direction_output(struct gpio_chip *chip,
 303                                         unsigned offset, int value)
 304 {
 305         htcpld_chip_set(chip, offset, value);
 306         return 0;
 307 }
 308
 309 static int htcpld_direction_input(struct gpio_chip *chip,
 310                                         unsigned offset)
 311 {
 312         /*
 313          * No-op: this function can only be called on the input chip.
 314          * We do however make sure the offset is within range.
 315          */
 316         return (offset < chip->ngpio) ? 0 : -EINVAL;
 317 }
 318
 319 int htcpld_chip_to_irq(struct gpio_chip *chip, unsigned offset)
 320 {
 321         struct htcpld_chip *chip_data;
 322
 323         chip_data = container_of(chip, struct htcpld_chip, chip_in);
 324
 325         if (offset < chip_data->nirqs)
 326                 return chip_data->irq_start + offset;
 327         else
 328                 return -EINVAL;
 329 }
 330
 331 void htcpld_chip_reset(struct i2c_client *client)
 332 {
 333         struct htcpld_chip *chip_data = i2c_get_clientdata(client);
 334         if (!chip_data)
 335                 return;
 336
 337         i2c_smbus_read_byte_data(
 338                 client, (chip_data->cache_out = chip_data->reset));
 339 }
 340
 341 static int __devinit htcpld_setup_chip_irq(
 342                 struct platform_device *pdev,
 343                 int chip_index)
 344 {
 345         struct htcpld_data *htcpld;
 346         struct device *dev = &pdev->dev;
 347         struct htcpld_core_platform_data *pdata;
 348         struct htcpld_chip *chip;
 349         struct htcpld_chip_platform_data *plat_chip_data;
 350         unsigned int irq, irq_end;
 351         int ret = 0;
 352
 353         /* Get the platform and driver data */
 354         pdata = dev->platform_data;
 355         htcpld = platform_get_drvdata(pdev);
 356         chip = &htcpld->chip[chip_index];
 357         plat_chip_data = &pdata->chip[chip_index];
 358
 359         /* Setup irq handlers */
 360         irq_end = chip->irq_start + chip->nirqs;
 361         for (irq = chip->irq_start; irq < irq_end; irq++) {
 362                 set_irq_chip(irq, &htcpld_muxed_chip);
 363                 set_irq_chip_data(irq, chip);
 364                 set_irq_handler(irq, handle_simple_irq);
 365 #ifdef CONFIG_ARM
 366                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 367 #else
 368                 set_irq_probe(irq);
 369 #endif
 370         }
 371
 372         return ret;
 373 }
 374
 375 static int __devinit htcpld_register_chip_i2c(
 376                 struct platform_device *pdev,
 377                 int chip_index)
 378 {
 379         struct htcpld_data *htcpld;
 380         struct device *dev = &pdev->dev;
 381         struct htcpld_core_platform_data *pdata;
 382         struct htcpld_chip *chip;
 383         struct htcpld_chip_platform_data *plat_chip_data;
 384         struct i2c_adapter *adapter;
 385         struct i2c_client *client;
 386         struct i2c_board_info info;
 387
 388         /* Get the platform and driver data */
 389         pdata = dev->platform_data;
 390         htcpld = platform_get_drvdata(pdev);
 391         chip = &htcpld->chip[chip_index];
 392         plat_chip_data = &pdata->chip[chip_index];
 393
 394         adapter = i2c_get_adapter(pdata->i2c_adapter_id);
 395         if (adapter == NULL) {
 396                 /* Eek, no such I2C adapter!  Bail out. */
 397                 dev_warn(dev, "Chip at i2c address 0x%x: Invalid i2c adapter %d\n",
 398                          plat_chip_data->addr, pdata->i2c_adapter_id);
 399                 return -ENODEV;
 400         }
 401
 402         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA)) {
 403                 dev_warn(dev, "i2c adapter %d non-functional\n",
 404                          pdata->i2c_adapter_id);
 405                 return -EINVAL;
 406         }
 407
 408         memset(&info, 0, sizeof(struct i2c_board_info));
 409         info.addr = plat_chip_data->addr;
 410         strlcpy(info.type, "htcpld-chip", I2C_NAME_SIZE);
 411         info.platform_data = chip;
 412
 413         /* Add the I2C device.  This calls the probe() function. */
 414         client = i2c_new_device(adapter, &info);
 415         if (!client) {
 416                 /* I2C device registration failed, contineu with the next */
 417                 dev_warn(dev, "Unable to add I2C device for 0x%x\n",
 418                          plat_chip_data->addr);
 419                 return -ENODEV;
 420         }
 421
 422         i2c_set_clientdata(client, chip);
 423         snprintf(client->name, I2C_NAME_SIZE, "Chip_0x%d", client->addr);
 424         chip->client = client;
 425
 426         /* Reset the chip */
 427         htcpld_chip_reset(client);
 428         chip->cache_in = i2c_smbus_read_byte_data(client, chip->cache_out);
 429
 430         return 0;
 431 }
 432
 433 static void __devinit htcpld_unregister_chip_i2c(
 434                 struct platform_device *pdev,
 435                 int chip_index)
 436 {
 437         struct htcpld_data *htcpld;
 438         struct htcpld_chip *chip;
 439
 440         /* Get the platform and driver data */
 441         htcpld = platform_get_drvdata(pdev);
 442         chip = &htcpld->chip[chip_index];
 443
 444         if (chip->client)
 445                 i2c_unregister_device(chip->client);
 446 }
 447
 448 static int __devinit htcpld_register_chip_gpio(
 449                 struct platform_device *pdev,
 450                 int chip_index)
 451 {
 452         struct htcpld_data *htcpld;
 453         struct device *dev = &pdev->dev;
 454         struct htcpld_core_platform_data *pdata;
 455         struct htcpld_chip *chip;
 456         struct htcpld_chip_platform_data *plat_chip_data;
 457         struct gpio_chip *gpio_chip;
 458         int ret = 0;
 459
 460         /* Get the platform and driver data */
 461         pdata = dev->platform_data;
 462         htcpld = platform_get_drvdata(pdev);
 463         chip = &htcpld->chip[chip_index];
 464         plat_chip_data = &pdata->chip[chip_index];
 465
 466         /* Setup the GPIO chips */
 467         gpio_chip = &(chip->chip_out);
 468         gpio_chip->label           = "htcpld-out";
 469         gpio_chip->dev             = dev;
 470         gpio_chip->owner           = THIS_MODULE;
 471         gpio_chip->get             = htcpld_chip_get;
 472         gpio_chip->set             = htcpld_chip_set;
 473         gpio_chip->direction_input = NULL;
 474         gpio_chip->direction_output = htcpld_direction_output;
 475         gpio_chip->base            = plat_chip_data->gpio_out_base;
 476         gpio_chip->ngpio           = plat_chip_data->num_gpios;
 477
 478         gpio_chip = &(chip->chip_in);
 479         gpio_chip->label           = "htcpld-in";
 480         gpio_chip->dev             = dev;
 481         gpio_chip->owner           = THIS_MODULE;
 482         gpio_chip->get             = htcpld_chip_get;
 483         gpio_chip->set             = NULL;
 484         gpio_chip->direction_input = htcpld_direction_input;
 485         gpio_chip->direction_output = NULL;
 486         gpio_chip->to_irq          = htcpld_chip_to_irq;
 487         gpio_chip->base            = plat_chip_data->gpio_in_base;
 488         gpio_chip->ngpio           = plat_chip_data->num_gpios;
 489
 490         /* Add the GPIO chips */
 491         ret = gpiochip_add(&(chip->chip_out));
 492         if (ret) {
 493                 dev_warn(dev, "Unable to register output GPIOs for 0x%x: %d\n",
 494                          plat_chip_data->addr, ret);
 495                 return ret;
 496         }
 497
 498         ret = gpiochip_add(&(chip->chip_in));
 499         if (ret) {
 500                 int error;
 501
 502                 dev_warn(dev, "Unable to register input GPIOs for 0x%x: %d\n",
 503                          plat_chip_data->addr, ret);
 504
 505                 error = gpiochip_remove(&(chip->chip_out));
 506                 if (error)
 507                         dev_warn(dev, "Error while trying to unregister gpio chip: %d\n", error);
 508
 509                 return ret;
 510         }
 511
 512         return 0;
 513 }
 514
 515 static int __devinit htcpld_setup_chips(struct platform_device *pdev)
 516 {
 517         struct htcpld_data *htcpld;
 518         struct device *dev = &pdev->dev;
 519         struct htcpld_core_platform_data *pdata;
 520         int i;
 521
 522         /* Get the platform and driver data */
 523         pdata = dev->platform_data;
 524         htcpld = platform_get_drvdata(pdev);
 525
 526         /* Setup each chip's output GPIOs */
 527         htcpld->nchips = pdata->num_chip;
 528         htcpld->chip = kzalloc(sizeof(struct htcpld_chip) * htcpld->nchips,
 529                                GFP_KERNEL);
 530         if (!htcpld->chip) {
 531                 dev_warn(dev, "Unable to allocate memory for chips\n");
 532                 return -ENOMEM;
 533         }
 534
 535         /* Add the chips as best we can */
 536         for (i = 0; i < htcpld->nchips; i++) {
 537                 int ret;
 538
 539                 /* Setup the HTCPLD chips */
 540                 htcpld->chip[i].reset = pdata->chip[i].reset;
 541                 htcpld->chip[i].cache_out = pdata->chip[i].reset;
 542                 htcpld->chip[i].cache_in = 0;
 543                 htcpld->chip[i].dev = dev;
 544                 htcpld->chip[i].irq_start = pdata->chip[i].irq_base;
 545                 htcpld->chip[i].nirqs = pdata->chip[i].num_irqs;
 546
 547                 INIT_WORK(&(htcpld->chip[i].set_val_work), &htcpld_chip_set_ni);
 548                 spin_lock_init(&(htcpld->chip[i].lock));
 549
 550                 /* Setup the interrupts for the chip */
 551                 if (htcpld->chained_irq) {
 552                         ret = htcpld_setup_chip_irq(pdev, i);
 553                         if (ret)
 554                                 continue;
 555                 }
 556
 557                 /* Register the chip with I2C */
 558                 ret = htcpld_register_chip_i2c(pdev, i);
 559                 if (ret)
 560                         continue;
 561
 562
 563                 /* Register the chips with the GPIO subsystem */
 564                 ret = htcpld_register_chip_gpio(pdev, i);
 565                 if (ret) {
 566                         /* Unregister the chip from i2c and continue */
 567                         htcpld_unregister_chip_i2c(pdev, i);
 568                         continue;
 569                 }
 570
 571                 dev_info(dev, "Registered chip at 0x%x\n", pdata->chip[i].addr);
 572         }
 573
 574         return 0;
 575 }
 576
 577 static int __devinit htcpld_core_probe(struct platform_device *pdev)
 578 {
 579         struct htcpld_data *htcpld;
 580         struct device *dev = &pdev->dev;
 581         struct htcpld_core_platform_data *pdata;
 582         struct resource *res;
 583         int ret = 0;
 584
 585         if (!dev)
 586                 return -ENODEV;
 587
 588         pdata = dev->platform_data;
 589         if (!pdata) {
 590                 dev_warn(dev, "Platform data not found for htcpld core!\n");
 591                 return -ENXIO;
 592         }
 593
 594         htcpld = kzalloc(sizeof(struct htcpld_data), GFP_KERNEL);
 595         if (!htcpld)
 596                 return -ENOMEM;
 597
 598         /* Find chained irq */
 599         ret = -EINVAL;
 600         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 601         if (res) {
 602                 int flags;
 603                 htcpld->chained_irq = res->start;
 604
 605                 /* Setup the chained interrupt handler */
 606                 flags = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING;
 607                 ret = request_threaded_irq(htcpld->chained_irq,
 608                                            NULL, htcpld_handler,
 609                                            flags, pdev->name, htcpld);
 610                 if (ret) {
 611                         dev_warn(dev, "Unable to setup chained irq handler: %d\n", ret);
 612                         goto fail;
 613                 } else
 614                         device_init_wakeup(dev, 0);
 615         }
 616
 617         /* Set the driver data */
 618         platform_set_drvdata(pdev, htcpld);
 619
 620         /* Setup the htcpld chips */
 621         ret = htcpld_setup_chips(pdev);
 622         if (ret)
 623                 goto fail;
 624
 625         /* Request the GPIO(s) for the int reset and set them up */
 626         if (pdata->int_reset_gpio_hi) {
 627                 ret = gpio_request(pdata->int_reset_gpio_hi, "htcpld-core");
 628                 if (ret) {
 629                         /*
 630                          * If it failed, that sucks, but we can probably
 631                          * continue on without it.
 632                          */
 633                         dev_warn(dev, "Unable to request int_reset_gpio_hi -- interrupts may not work\n");
 634                         htcpld->int_reset_gpio_hi = 0;
 635                 } else {
 636                         htcpld->int_reset_gpio_hi = pdata->int_reset_gpio_hi;
 637                         gpio_set_value(htcpld->int_reset_gpio_hi, 1);
 638                 }
 639         }
 640
 641         if (pdata->int_reset_gpio_lo) {
 642                 ret = gpio_request(pdata->int_reset_gpio_lo, "htcpld-core");
 643                 if (ret) {
 644                         /*
 645                          * If it failed, that sucks, but we can probably
 646                          * continue on without it.
 647                          */
 648                         dev_warn(dev, "Unable to request int_reset_gpio_lo -- interrupts may not work\n");
 649                         htcpld->int_reset_gpio_lo = 0;
 650                 } else {
 651                         htcpld->int_reset_gpio_lo = pdata->int_reset_gpio_lo;
 652                         gpio_set_value(htcpld->int_reset_gpio_lo, 0);
 653                 }
 654         }
 655
 656         dev_info(dev, "Initialized successfully\n");
 657         return 0;
 658
 659 fail:
 660         kfree(htcpld);
 661         return ret;
 662 }
 663
 664 /* The I2C Driver -- used internally */
 665 static const struct i2c_device_id htcpld_chip_id[] = {
 666         { "htcpld-chip", 0 },
 667         { }
 668 };
 669 MODULE_DEVICE_TABLE(i2c, htcpld_chip_id);
 670
 671
 672 static struct i2c_driver htcpld_chip_driver = {
 673         .driver = {
 674                 .name   = "htcpld-chip",
 675         },
 676         .id_table = htcpld_chip_id,
 677 };
 678
 679 /* The Core Driver */
 680 static struct platform_driver htcpld_core_driver = {
 681         .driver = {
 682                 .name = "i2c-htcpld",
 683         },
 684 };
 685
 686 static int __init htcpld_core_init(void)
 687 {
 688         int ret;
 689
 690         /* Register the I2C Chip driver */
 691         ret = i2c_add_driver(&htcpld_chip_driver);
 692         if (ret)
 693                 return ret;
 694
 695         /* Probe for our chips */
 696         return platform_driver_probe(&htcpld_core_driver, htcpld_core_probe);
 697 }
 698
 699 static void __exit htcpld_core_exit(void)
 700 {
 701         i2c_del_driver(&htcpld_chip_driver);
 702         platform_driver_unregister(&htcpld_core_driver);
 703 }
 704
 705 module_init(htcpld_core_init);
 706 module_exit(htcpld_core_exit);
 707
 708 MODULE_AUTHOR("Cory Maccarrone <darkstar6262@gmail.com>");
 709 MODULE_DESCRIPTION("I2C HTC PLD Driver");
 710 MODULE_LICENSE("GPL");
 711