linux/drivers/mfd/htc-i2cpld.c
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   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
  40struct 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
  69struct 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. */
  86static 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}
  92static 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
  99static 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
 114static 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 */
 126static 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 */
 227static 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
 251static 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
 261static 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
 291static 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
 298static 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
 308static 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
 320static 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
 330static int 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
 364static int 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
 422static void 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
 437static int 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
 504static int 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
 566static int 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
 648fail:
 649        kfree(htcpld);
 650        return ret;
 651}
 652
 653/* The I2C Driver -- used internally */
 654static const struct i2c_device_id htcpld_chip_id[] = {
 655        { "htcpld-chip", 0 },
 656        { }
 657};
 658MODULE_DEVICE_TABLE(i2c, htcpld_chip_id);
 659
 660
 661static 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 */
 669static struct platform_driver htcpld_core_driver = {
 670        .driver = {
 671                .name = "i2c-htcpld",
 672        },
 673};
 674
 675static 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
 688static void __exit htcpld_core_exit(void)
 689{
 690        i2c_del_driver(&htcpld_chip_driver);
 691        platform_driver_unregister(&htcpld_core_driver);
 692}
 693
 694module_init(htcpld_core_init);
 695module_exit(htcpld_core_exit);
 696
 697MODULE_AUTHOR("Cory Maccarrone <darkstar6262@gmail.com>");
 698MODULE_DESCRIPTION("I2C HTC PLD Driver");
 699MODULE_LICENSE("GPL");
 700
 701
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