linux/drivers/gpio/gpio-pca953x.c
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   1/*
   2 *  PCA953x 4/8/16/24/40 bit I/O ports
   3 *
   4 *  Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
   5 *  Copyright (C) 2007 Marvell International Ltd.
   6 *
   7 *  Derived from drivers/i2c/chips/pca9539.c
   8 *
   9 *  This program is free software; you can redistribute it and/or modify
  10 *  it under the terms of the GNU General Public License as published by
  11 *  the Free Software Foundation; version 2 of the License.
  12 */
  13
  14#include <linux/module.h>
  15#include <linux/init.h>
  16#include <linux/gpio.h>
  17#include <linux/interrupt.h>
  18#include <linux/i2c.h>
  19#include <linux/platform_data/pca953x.h>
  20#include <linux/slab.h>
  21#ifdef CONFIG_OF_GPIO
  22#include <linux/of_platform.h>
  23#endif
  24
  25#define PCA953X_INPUT           0
  26#define PCA953X_OUTPUT          1
  27#define PCA953X_INVERT          2
  28#define PCA953X_DIRECTION       3
  29
  30#define REG_ADDR_AI             0x80
  31
  32#define PCA957X_IN              0
  33#define PCA957X_INVRT           1
  34#define PCA957X_BKEN            2
  35#define PCA957X_PUPD            3
  36#define PCA957X_CFG             4
  37#define PCA957X_OUT             5
  38#define PCA957X_MSK             6
  39#define PCA957X_INTS            7
  40
  41#define PCA_GPIO_MASK           0x00FF
  42#define PCA_INT                 0x0100
  43#define PCA953X_TYPE            0x1000
  44#define PCA957X_TYPE            0x2000
  45
  46static const struct i2c_device_id pca953x_id[] = {
  47        { "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
  48        { "pca9534", 8  | PCA953X_TYPE | PCA_INT, },
  49        { "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
  50        { "pca9536", 4  | PCA953X_TYPE, },
  51        { "pca9537", 4  | PCA953X_TYPE | PCA_INT, },
  52        { "pca9538", 8  | PCA953X_TYPE | PCA_INT, },
  53        { "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
  54        { "pca9554", 8  | PCA953X_TYPE | PCA_INT, },
  55        { "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
  56        { "pca9556", 8  | PCA953X_TYPE, },
  57        { "pca9557", 8  | PCA953X_TYPE, },
  58        { "pca9574", 8  | PCA957X_TYPE | PCA_INT, },
  59        { "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
  60        { "pca9698", 40 | PCA953X_TYPE, },
  61
  62        { "max7310", 8  | PCA953X_TYPE, },
  63        { "max7312", 16 | PCA953X_TYPE | PCA_INT, },
  64        { "max7313", 16 | PCA953X_TYPE | PCA_INT, },
  65        { "max7315", 8  | PCA953X_TYPE | PCA_INT, },
  66        { "pca6107", 8  | PCA953X_TYPE | PCA_INT, },
  67        { "tca6408", 8  | PCA953X_TYPE | PCA_INT, },
  68        { "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
  69        { "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
  70        { "xra1202", 8  | PCA953X_TYPE },
  71        { }
  72};
  73MODULE_DEVICE_TABLE(i2c, pca953x_id);
  74
  75#define MAX_BANK 5
  76#define BANK_SZ 8
  77
  78#define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)
  79
  80struct pca953x_chip {
  81        unsigned gpio_start;
  82        u8 reg_output[MAX_BANK];
  83        u8 reg_direction[MAX_BANK];
  84        struct mutex i2c_lock;
  85
  86#ifdef CONFIG_GPIO_PCA953X_IRQ
  87        struct mutex irq_lock;
  88        u8 irq_mask[MAX_BANK];
  89        u8 irq_stat[MAX_BANK];
  90        u8 irq_trig_raise[MAX_BANK];
  91        u8 irq_trig_fall[MAX_BANK];
  92#endif
  93
  94        struct i2c_client *client;
  95        struct gpio_chip gpio_chip;
  96        const char *const *names;
  97        int     chip_type;
  98};
  99
 100static inline struct pca953x_chip *to_pca(struct gpio_chip *gc)
 101{
 102        return container_of(gc, struct pca953x_chip, gpio_chip);
 103}
 104
 105static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
 106                                int off)
 107{
 108        int ret;
 109        int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 110        int offset = off / BANK_SZ;
 111
 112        ret = i2c_smbus_read_byte_data(chip->client,
 113                                (reg << bank_shift) + offset);
 114        *val = ret;
 115
 116        if (ret < 0) {
 117                dev_err(&chip->client->dev, "failed reading register\n");
 118                return ret;
 119        }
 120
 121        return 0;
 122}
 123
 124static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
 125                                int off)
 126{
 127        int ret = 0;
 128        int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 129        int offset = off / BANK_SZ;
 130
 131        ret = i2c_smbus_write_byte_data(chip->client,
 132                                        (reg << bank_shift) + offset, val);
 133
 134        if (ret < 0) {
 135                dev_err(&chip->client->dev, "failed writing register\n");
 136                return ret;
 137        }
 138
 139        return 0;
 140}
 141
 142static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
 143{
 144        int ret = 0;
 145
 146        if (chip->gpio_chip.ngpio <= 8)
 147                ret = i2c_smbus_write_byte_data(chip->client, reg, *val);
 148        else if (chip->gpio_chip.ngpio >= 24) {
 149                int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 150                ret = i2c_smbus_write_i2c_block_data(chip->client,
 151                                        (reg << bank_shift) | REG_ADDR_AI,
 152                                        NBANK(chip), val);
 153        } else {
 154                switch (chip->chip_type) {
 155                case PCA953X_TYPE:
 156                        ret = i2c_smbus_write_word_data(chip->client,
 157                                                        reg << 1, (u16) *val);
 158                        break;
 159                case PCA957X_TYPE:
 160                        ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
 161                                                        val[0]);
 162                        if (ret < 0)
 163                                break;
 164                        ret = i2c_smbus_write_byte_data(chip->client,
 165                                                        (reg << 1) + 1,
 166                                                        val[1]);
 167                        break;
 168                }
 169        }
 170
 171        if (ret < 0) {
 172                dev_err(&chip->client->dev, "failed writing register\n");
 173                return ret;
 174        }
 175
 176        return 0;
 177}
 178
 179static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
 180{
 181        int ret;
 182
 183        if (chip->gpio_chip.ngpio <= 8) {
 184                ret = i2c_smbus_read_byte_data(chip->client, reg);
 185                *val = ret;
 186        } else if (chip->gpio_chip.ngpio >= 24) {
 187                int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 188
 189                ret = i2c_smbus_read_i2c_block_data(chip->client,
 190                                        (reg << bank_shift) | REG_ADDR_AI,
 191                                        NBANK(chip), val);
 192        } else {
 193                ret = i2c_smbus_read_word_data(chip->client, reg << 1);
 194                val[0] = (u16)ret & 0xFF;
 195                val[1] = (u16)ret >> 8;
 196        }
 197        if (ret < 0) {
 198                dev_err(&chip->client->dev, "failed reading register\n");
 199                return ret;
 200        }
 201
 202        return 0;
 203}
 204
 205static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
 206{
 207        struct pca953x_chip *chip = to_pca(gc);
 208        u8 reg_val;
 209        int ret, offset = 0;
 210
 211        mutex_lock(&chip->i2c_lock);
 212        reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));
 213
 214        switch (chip->chip_type) {
 215        case PCA953X_TYPE:
 216                offset = PCA953X_DIRECTION;
 217                break;
 218        case PCA957X_TYPE:
 219                offset = PCA957X_CFG;
 220                break;
 221        }
 222        ret = pca953x_write_single(chip, offset, reg_val, off);
 223        if (ret)
 224                goto exit;
 225
 226        chip->reg_direction[off / BANK_SZ] = reg_val;
 227        ret = 0;
 228exit:
 229        mutex_unlock(&chip->i2c_lock);
 230        return ret;
 231}
 232
 233static int pca953x_gpio_direction_output(struct gpio_chip *gc,
 234                unsigned off, int val)
 235{
 236        struct pca953x_chip *chip = to_pca(gc);
 237        u8 reg_val;
 238        int ret, offset = 0;
 239
 240        mutex_lock(&chip->i2c_lock);
 241        /* set output level */
 242        if (val)
 243                reg_val = chip->reg_output[off / BANK_SZ]
 244                        | (1u << (off % BANK_SZ));
 245        else
 246                reg_val = chip->reg_output[off / BANK_SZ]
 247                        & ~(1u << (off % BANK_SZ));
 248
 249        switch (chip->chip_type) {
 250        case PCA953X_TYPE:
 251                offset = PCA953X_OUTPUT;
 252                break;
 253        case PCA957X_TYPE:
 254                offset = PCA957X_OUT;
 255                break;
 256        }
 257        ret = pca953x_write_single(chip, offset, reg_val, off);
 258        if (ret)
 259                goto exit;
 260
 261        chip->reg_output[off / BANK_SZ] = reg_val;
 262
 263        /* then direction */
 264        reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
 265        switch (chip->chip_type) {
 266        case PCA953X_TYPE:
 267                offset = PCA953X_DIRECTION;
 268                break;
 269        case PCA957X_TYPE:
 270                offset = PCA957X_CFG;
 271                break;
 272        }
 273        ret = pca953x_write_single(chip, offset, reg_val, off);
 274        if (ret)
 275                goto exit;
 276
 277        chip->reg_direction[off / BANK_SZ] = reg_val;
 278        ret = 0;
 279exit:
 280        mutex_unlock(&chip->i2c_lock);
 281        return ret;
 282}
 283
 284static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
 285{
 286        struct pca953x_chip *chip = to_pca(gc);
 287        u32 reg_val;
 288        int ret, offset = 0;
 289
 290        mutex_lock(&chip->i2c_lock);
 291        switch (chip->chip_type) {
 292        case PCA953X_TYPE:
 293                offset = PCA953X_INPUT;
 294                break;
 295        case PCA957X_TYPE:
 296                offset = PCA957X_IN;
 297                break;
 298        }
 299        ret = pca953x_read_single(chip, offset, &reg_val, off);
 300        mutex_unlock(&chip->i2c_lock);
 301        if (ret < 0) {
 302                /* NOTE:  diagnostic already emitted; that's all we should
 303                 * do unless gpio_*_value_cansleep() calls become different
 304                 * from their nonsleeping siblings (and report faults).
 305                 */
 306                return 0;
 307        }
 308
 309        return (reg_val & (1u << (off % BANK_SZ))) ? 1 : 0;
 310}
 311
 312static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
 313{
 314        struct pca953x_chip *chip = to_pca(gc);
 315        u8 reg_val;
 316        int ret, offset = 0;
 317
 318        mutex_lock(&chip->i2c_lock);
 319        if (val)
 320                reg_val = chip->reg_output[off / BANK_SZ]
 321                        | (1u << (off % BANK_SZ));
 322        else
 323                reg_val = chip->reg_output[off / BANK_SZ]
 324                        & ~(1u << (off % BANK_SZ));
 325
 326        switch (chip->chip_type) {
 327        case PCA953X_TYPE:
 328                offset = PCA953X_OUTPUT;
 329                break;
 330        case PCA957X_TYPE:
 331                offset = PCA957X_OUT;
 332                break;
 333        }
 334        ret = pca953x_write_single(chip, offset, reg_val, off);
 335        if (ret)
 336                goto exit;
 337
 338        chip->reg_output[off / BANK_SZ] = reg_val;
 339exit:
 340        mutex_unlock(&chip->i2c_lock);
 341}
 342
 343static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
 344{
 345        struct gpio_chip *gc;
 346
 347        gc = &chip->gpio_chip;
 348
 349        gc->direction_input  = pca953x_gpio_direction_input;
 350        gc->direction_output = pca953x_gpio_direction_output;
 351        gc->get = pca953x_gpio_get_value;
 352        gc->set = pca953x_gpio_set_value;
 353        gc->can_sleep = true;
 354
 355        gc->base = chip->gpio_start;
 356        gc->ngpio = gpios;
 357        gc->label = chip->client->name;
 358        gc->dev = &chip->client->dev;
 359        gc->owner = THIS_MODULE;
 360        gc->names = chip->names;
 361}
 362
 363#ifdef CONFIG_GPIO_PCA953X_IRQ
 364static void pca953x_irq_mask(struct irq_data *d)
 365{
 366        struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 367        struct pca953x_chip *chip = to_pca(gc);
 368
 369        chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));
 370}
 371
 372static void pca953x_irq_unmask(struct irq_data *d)
 373{
 374        struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 375        struct pca953x_chip *chip = to_pca(gc);
 376
 377        chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
 378}
 379
 380static void pca953x_irq_bus_lock(struct irq_data *d)
 381{
 382        struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 383        struct pca953x_chip *chip = to_pca(gc);
 384
 385        mutex_lock(&chip->irq_lock);
 386}
 387
 388static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
 389{
 390        struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 391        struct pca953x_chip *chip = to_pca(gc);
 392        u8 new_irqs;
 393        int level, i;
 394
 395        /* Look for any newly setup interrupt */
 396        for (i = 0; i < NBANK(chip); i++) {
 397                new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i];
 398                new_irqs &= ~chip->reg_direction[i];
 399
 400                while (new_irqs) {
 401                        level = __ffs(new_irqs);
 402                        pca953x_gpio_direction_input(&chip->gpio_chip,
 403                                                        level + (BANK_SZ * i));
 404                        new_irqs &= ~(1 << level);
 405                }
 406        }
 407
 408        mutex_unlock(&chip->irq_lock);
 409}
 410
 411static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
 412{
 413        struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 414        struct pca953x_chip *chip = to_pca(gc);
 415        int bank_nb = d->hwirq / BANK_SZ;
 416        u8 mask = 1 << (d->hwirq % BANK_SZ);
 417
 418        if (!(type & IRQ_TYPE_EDGE_BOTH)) {
 419                dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
 420                        d->irq, type);
 421                return -EINVAL;
 422        }
 423
 424        if (type & IRQ_TYPE_EDGE_FALLING)
 425                chip->irq_trig_fall[bank_nb] |= mask;
 426        else
 427                chip->irq_trig_fall[bank_nb] &= ~mask;
 428
 429        if (type & IRQ_TYPE_EDGE_RISING)
 430                chip->irq_trig_raise[bank_nb] |= mask;
 431        else
 432                chip->irq_trig_raise[bank_nb] &= ~mask;
 433
 434        return 0;
 435}
 436
 437static struct irq_chip pca953x_irq_chip = {
 438        .name                   = "pca953x",
 439        .irq_mask               = pca953x_irq_mask,
 440        .irq_unmask             = pca953x_irq_unmask,
 441        .irq_bus_lock           = pca953x_irq_bus_lock,
 442        .irq_bus_sync_unlock    = pca953x_irq_bus_sync_unlock,
 443        .irq_set_type           = pca953x_irq_set_type,
 444};
 445
 446static u8 pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
 447{
 448        u8 cur_stat[MAX_BANK];
 449        u8 old_stat[MAX_BANK];
 450        u8 pendings = 0;
 451        u8 trigger[MAX_BANK], triggers = 0;
 452        int ret, i, offset = 0;
 453
 454        switch (chip->chip_type) {
 455        case PCA953X_TYPE:
 456                offset = PCA953X_INPUT;
 457                break;
 458        case PCA957X_TYPE:
 459                offset = PCA957X_IN;
 460                break;
 461        }
 462        ret = pca953x_read_regs(chip, offset, cur_stat);
 463        if (ret)
 464                return 0;
 465
 466        /* Remove output pins from the equation */
 467        for (i = 0; i < NBANK(chip); i++)
 468                cur_stat[i] &= chip->reg_direction[i];
 469
 470        memcpy(old_stat, chip->irq_stat, NBANK(chip));
 471
 472        for (i = 0; i < NBANK(chip); i++) {
 473                trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i];
 474                triggers += trigger[i];
 475        }
 476
 477        if (!triggers)
 478                return 0;
 479
 480        memcpy(chip->irq_stat, cur_stat, NBANK(chip));
 481
 482        for (i = 0; i < NBANK(chip); i++) {
 483                pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) |
 484                        (cur_stat[i] & chip->irq_trig_raise[i]);
 485                pending[i] &= trigger[i];
 486                pendings += pending[i];
 487        }
 488
 489        return pendings;
 490}
 491
 492static irqreturn_t pca953x_irq_handler(int irq, void *devid)
 493{
 494        struct pca953x_chip *chip = devid;
 495        u8 pending[MAX_BANK];
 496        u8 level;
 497        unsigned nhandled = 0;
 498        int i;
 499
 500        if (!pca953x_irq_pending(chip, pending))
 501                return IRQ_NONE;
 502
 503        for (i = 0; i < NBANK(chip); i++) {
 504                while (pending[i]) {
 505                        level = __ffs(pending[i]);
 506                        handle_nested_irq(irq_find_mapping(chip->gpio_chip.irqdomain,
 507                                                        level + (BANK_SZ * i)));
 508                        pending[i] &= ~(1 << level);
 509                        nhandled++;
 510                }
 511        }
 512
 513        return (nhandled > 0) ? IRQ_HANDLED : IRQ_NONE;
 514}
 515
 516static int pca953x_irq_setup(struct pca953x_chip *chip,
 517                             const struct i2c_device_id *id,
 518                             int irq_base)
 519{
 520        struct i2c_client *client = chip->client;
 521        int ret, i, offset = 0;
 522
 523        if (irq_base != -1
 524                        && (id->driver_data & PCA_INT)) {
 525
 526                switch (chip->chip_type) {
 527                case PCA953X_TYPE:
 528                        offset = PCA953X_INPUT;
 529                        break;
 530                case PCA957X_TYPE:
 531                        offset = PCA957X_IN;
 532                        break;
 533                }
 534                ret = pca953x_read_regs(chip, offset, chip->irq_stat);
 535                if (ret)
 536                        return ret;
 537
 538                /*
 539                 * There is no way to know which GPIO line generated the
 540                 * interrupt.  We have to rely on the previous read for
 541                 * this purpose.
 542                 */
 543                for (i = 0; i < NBANK(chip); i++)
 544                        chip->irq_stat[i] &= chip->reg_direction[i];
 545                mutex_init(&chip->irq_lock);
 546
 547                ret = devm_request_threaded_irq(&client->dev,
 548                                        client->irq,
 549                                           NULL,
 550                                           pca953x_irq_handler,
 551                                           IRQF_TRIGGER_LOW | IRQF_ONESHOT |
 552                                                   IRQF_SHARED,
 553                                           dev_name(&client->dev), chip);
 554                if (ret) {
 555                        dev_err(&client->dev, "failed to request irq %d\n",
 556                                client->irq);
 557                        return ret;
 558                }
 559
 560                ret =  gpiochip_irqchip_add(&chip->gpio_chip,
 561                                            &pca953x_irq_chip,
 562                                            irq_base,
 563                                            handle_simple_irq,
 564                                            IRQ_TYPE_NONE);
 565                if (ret) {
 566                        dev_err(&client->dev,
 567                                "could not connect irqchip to gpiochip\n");
 568                        return ret;
 569                }
 570        }
 571
 572        return 0;
 573}
 574
 575#else /* CONFIG_GPIO_PCA953X_IRQ */
 576static int pca953x_irq_setup(struct pca953x_chip *chip,
 577                             const struct i2c_device_id *id,
 578                             int irq_base)
 579{
 580        struct i2c_client *client = chip->client;
 581
 582        if (irq_base != -1 && (id->driver_data & PCA_INT))
 583                dev_warn(&client->dev, "interrupt support not compiled in\n");
 584
 585        return 0;
 586}
 587#endif
 588
 589/*
 590 * Handlers for alternative sources of platform_data
 591 */
 592#ifdef CONFIG_OF_GPIO
 593/*
 594 * Translate OpenFirmware node properties into platform_data
 595 * WARNING: This is DEPRECATED and will be removed eventually!
 596 */
 597static void
 598pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
 599{
 600        struct device_node *node;
 601        const __be32 *val;
 602        int size;
 603
 604        *gpio_base = -1;
 605
 606        node = client->dev.of_node;
 607        if (node == NULL)
 608                return;
 609
 610        val = of_get_property(node, "linux,gpio-base", &size);
 611        WARN(val, "%s: device-tree property 'linux,gpio-base' is deprecated!", __func__);
 612        if (val) {
 613                if (size != sizeof(*val))
 614                        dev_warn(&client->dev, "%s: wrong linux,gpio-base\n",
 615                                 node->full_name);
 616                else
 617                        *gpio_base = be32_to_cpup(val);
 618        }
 619
 620        val = of_get_property(node, "polarity", NULL);
 621        WARN(val, "%s: device-tree property 'polarity' is deprecated!", __func__);
 622        if (val)
 623                *invert = *val;
 624}
 625#else
 626static void
 627pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
 628{
 629        *gpio_base = -1;
 630}
 631#endif
 632
 633static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
 634{
 635        int ret;
 636        u8 val[MAX_BANK];
 637
 638        ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output);
 639        if (ret)
 640                goto out;
 641
 642        ret = pca953x_read_regs(chip, PCA953X_DIRECTION,
 643                               chip->reg_direction);
 644        if (ret)
 645                goto out;
 646
 647        /* set platform specific polarity inversion */
 648        if (invert)
 649                memset(val, 0xFF, NBANK(chip));
 650        else
 651                memset(val, 0, NBANK(chip));
 652
 653        ret = pca953x_write_regs(chip, PCA953X_INVERT, val);
 654out:
 655        return ret;
 656}
 657
 658static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
 659{
 660        int ret;
 661        u8 val[MAX_BANK];
 662
 663        ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output);
 664        if (ret)
 665                goto out;
 666        ret = pca953x_read_regs(chip, PCA957X_CFG, chip->reg_direction);
 667        if (ret)
 668                goto out;
 669
 670        /* set platform specific polarity inversion */
 671        if (invert)
 672                memset(val, 0xFF, NBANK(chip));
 673        else
 674                memset(val, 0, NBANK(chip));
 675        pca953x_write_regs(chip, PCA957X_INVRT, val);
 676
 677        /* To enable register 6, 7 to controll pull up and pull down */
 678        memset(val, 0x02, NBANK(chip));
 679        pca953x_write_regs(chip, PCA957X_BKEN, val);
 680
 681        return 0;
 682out:
 683        return ret;
 684}
 685
 686static int pca953x_probe(struct i2c_client *client,
 687                                   const struct i2c_device_id *id)
 688{
 689        struct pca953x_platform_data *pdata;
 690        struct pca953x_chip *chip;
 691        int irq_base = 0;
 692        int ret;
 693        u32 invert = 0;
 694
 695        chip = devm_kzalloc(&client->dev,
 696                        sizeof(struct pca953x_chip), GFP_KERNEL);
 697        if (chip == NULL)
 698                return -ENOMEM;
 699
 700        pdata = dev_get_platdata(&client->dev);
 701        if (pdata) {
 702                irq_base = pdata->irq_base;
 703                chip->gpio_start = pdata->gpio_base;
 704                invert = pdata->invert;
 705                chip->names = pdata->names;
 706        } else {
 707                pca953x_get_alt_pdata(client, &chip->gpio_start, &invert);
 708#ifdef CONFIG_OF_GPIO
 709                /* If I2C node has no interrupts property, disable GPIO interrupts */
 710                if (of_find_property(client->dev.of_node, "interrupts", NULL) == NULL)
 711                        irq_base = -1;
 712#endif
 713        }
 714
 715        chip->client = client;
 716
 717        chip->chip_type = id->driver_data & (PCA953X_TYPE | PCA957X_TYPE);
 718
 719        mutex_init(&chip->i2c_lock);
 720
 721        /* initialize cached registers from their original values.
 722         * we can't share this chip with another i2c master.
 723         */
 724        pca953x_setup_gpio(chip, id->driver_data & PCA_GPIO_MASK);
 725
 726        if (chip->chip_type == PCA953X_TYPE)
 727                ret = device_pca953x_init(chip, invert);
 728        else
 729                ret = device_pca957x_init(chip, invert);
 730        if (ret)
 731                return ret;
 732
 733        ret = gpiochip_add(&chip->gpio_chip);
 734        if (ret)
 735                return ret;
 736
 737        ret = pca953x_irq_setup(chip, id, irq_base);
 738        if (ret)
 739                return ret;
 740
 741        if (pdata && pdata->setup) {
 742                ret = pdata->setup(client, chip->gpio_chip.base,
 743                                chip->gpio_chip.ngpio, pdata->context);
 744                if (ret < 0)
 745                        dev_warn(&client->dev, "setup failed, %d\n", ret);
 746        }
 747
 748        i2c_set_clientdata(client, chip);
 749        return 0;
 750}
 751
 752static int pca953x_remove(struct i2c_client *client)
 753{
 754        struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
 755        struct pca953x_chip *chip = i2c_get_clientdata(client);
 756        int ret = 0;
 757
 758        if (pdata && pdata->teardown) {
 759                ret = pdata->teardown(client, chip->gpio_chip.base,
 760                                chip->gpio_chip.ngpio, pdata->context);
 761                if (ret < 0) {
 762                        dev_err(&client->dev, "%s failed, %d\n",
 763                                        "teardown", ret);
 764                        return ret;
 765                }
 766        }
 767
 768        ret = gpiochip_remove(&chip->gpio_chip);
 769        if (ret) {
 770                dev_err(&client->dev, "%s failed, %d\n",
 771                                "gpiochip_remove()", ret);
 772                return ret;
 773        }
 774
 775        return 0;
 776}
 777
 778static const struct of_device_id pca953x_dt_ids[] = {
 779        { .compatible = "nxp,pca9505", },
 780        { .compatible = "nxp,pca9534", },
 781        { .compatible = "nxp,pca9535", },
 782        { .compatible = "nxp,pca9536", },
 783        { .compatible = "nxp,pca9537", },
 784        { .compatible = "nxp,pca9538", },
 785        { .compatible = "nxp,pca9539", },
 786        { .compatible = "nxp,pca9554", },
 787        { .compatible = "nxp,pca9555", },
 788        { .compatible = "nxp,pca9556", },
 789        { .compatible = "nxp,pca9557", },
 790        { .compatible = "nxp,pca9574", },
 791        { .compatible = "nxp,pca9575", },
 792        { .compatible = "nxp,pca9698", },
 793
 794        { .compatible = "maxim,max7310", },
 795        { .compatible = "maxim,max7312", },
 796        { .compatible = "maxim,max7313", },
 797        { .compatible = "maxim,max7315", },
 798
 799        { .compatible = "ti,pca6107", },
 800        { .compatible = "ti,tca6408", },
 801        { .compatible = "ti,tca6416", },
 802        { .compatible = "ti,tca6424", },
 803
 804        { .compatible = "exar,xra1202", },
 805        { }
 806};
 807
 808MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
 809
 810static struct i2c_driver pca953x_driver = {
 811        .driver = {
 812                .name   = "pca953x",
 813                .of_match_table = pca953x_dt_ids,
 814        },
 815        .probe          = pca953x_probe,
 816        .remove         = pca953x_remove,
 817        .id_table       = pca953x_id,
 818};
 819
 820static int __init pca953x_init(void)
 821{
 822        return i2c_add_driver(&pca953x_driver);
 823}
 824/* register after i2c postcore initcall and before
 825 * subsys initcalls that may rely on these GPIOs
 826 */
 827subsys_initcall(pca953x_init);
 828
 829static void __exit pca953x_exit(void)
 830{
 831        i2c_del_driver(&pca953x_driver);
 832}
 833module_exit(pca953x_exit);
 834
 835MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
 836MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
 837MODULE_LICENSE("GPL");
 838
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