drivers/gpio/gpio-pca953x.c

   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 #define PCA_TYPE_MASK           0xF000
  46
  47 #define PCA_CHIP_TYPE(x)        ((x) & PCA_TYPE_MASK)
  48
  49 static const struct i2c_device_id pca953x_id[] = {
  50         { "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
  51         { "pca9534", 8  | PCA953X_TYPE | PCA_INT, },
  52         { "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
  53         { "pca9536", 4  | PCA953X_TYPE, },
  54         { "pca9537", 4  | PCA953X_TYPE | PCA_INT, },
  55         { "pca9538", 8  | PCA953X_TYPE | PCA_INT, },
  56         { "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
  57         { "pca9554", 8  | PCA953X_TYPE | PCA_INT, },
  58         { "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
  59         { "pca9556", 8  | PCA953X_TYPE, },
  60         { "pca9557", 8  | PCA953X_TYPE, },
  61         { "pca9574", 8  | PCA957X_TYPE | PCA_INT, },
  62         { "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
  63         { "pca9698", 40 | PCA953X_TYPE, },
  64
  65         { "max7310", 8  | PCA953X_TYPE, },
  66         { "max7312", 16 | PCA953X_TYPE | PCA_INT, },
  67         { "max7313", 16 | PCA953X_TYPE | PCA_INT, },
  68         { "max7315", 8  | PCA953X_TYPE | PCA_INT, },
  69         { "pca6107", 8  | PCA953X_TYPE | PCA_INT, },
  70         { "tca6408", 8  | PCA953X_TYPE | PCA_INT, },
  71         { "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
  72         { "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
  73         { "tca9539", 16 | PCA953X_TYPE | PCA_INT, },
  74         { "xra1202", 8  | PCA953X_TYPE },
  75         { }
  76 };
  77 MODULE_DEVICE_TABLE(i2c, pca953x_id);
  78
  79 #define MAX_BANK 5
  80 #define BANK_SZ 8
  81
  82 #define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)
  83
  84 struct pca953x_chip {
  85         unsigned gpio_start;
  86         u8 reg_output[MAX_BANK];
  87         u8 reg_direction[MAX_BANK];
  88         struct mutex i2c_lock;
  89
  90 #ifdef CONFIG_GPIO_PCA953X_IRQ
  91         struct mutex irq_lock;
  92         u8 irq_mask[MAX_BANK];
  93         u8 irq_stat[MAX_BANK];
  94         u8 irq_trig_raise[MAX_BANK];
  95         u8 irq_trig_fall[MAX_BANK];
  96 #endif
  97
  98         struct i2c_client *client;
  99         struct gpio_chip gpio_chip;
 100         const char *const *names;
 101         int     chip_type;
 102         unsigned long driver_data;
 103 };
 104
 105 static inline struct pca953x_chip *to_pca(struct gpio_chip *gc)
 106 {
 107         return container_of(gc, struct pca953x_chip, gpio_chip);
 108 }
 109
 110 static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
 111                                 int off)
 112 {
 113         int ret;
 114         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 115         int offset = off / BANK_SZ;
 116
 117         ret = i2c_smbus_read_byte_data(chip->client,
 118                                 (reg << bank_shift) + offset);
 119         *val = ret;
 120
 121         if (ret < 0) {
 122                 dev_err(&chip->client->dev, "failed reading register\n");
 123                 return ret;
 124         }
 125
 126         return 0;
 127 }
 128
 129 static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
 130                                 int off)
 131 {
 132         int ret = 0;
 133         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 134         int offset = off / BANK_SZ;
 135
 136         ret = i2c_smbus_write_byte_data(chip->client,
 137                                         (reg << bank_shift) + offset, val);
 138
 139         if (ret < 0) {
 140                 dev_err(&chip->client->dev, "failed writing register\n");
 141                 return ret;
 142         }
 143
 144         return 0;
 145 }
 146
 147 static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
 148 {
 149         int ret = 0;
 150
 151         if (chip->gpio_chip.ngpio <= 8)
 152                 ret = i2c_smbus_write_byte_data(chip->client, reg, *val);
 153         else if (chip->gpio_chip.ngpio >= 24) {
 154                 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 155                 ret = i2c_smbus_write_i2c_block_data(chip->client,
 156                                         (reg << bank_shift) | REG_ADDR_AI,
 157                                         NBANK(chip), val);
 158         } else {
 159                 switch (chip->chip_type) {
 160                 case PCA953X_TYPE:
 161                         ret = i2c_smbus_write_word_data(chip->client,
 162                                                         reg << 1, (u16) *val);
 163                         break;
 164                 case PCA957X_TYPE:
 165                         ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
 166                                                         val[0]);
 167                         if (ret < 0)
 168                                 break;
 169                         ret = i2c_smbus_write_byte_data(chip->client,
 170                                                         (reg << 1) + 1,
 171                                                         val[1]);
 172                         break;
 173                 }
 174         }
 175
 176         if (ret < 0) {
 177                 dev_err(&chip->client->dev, "failed writing register\n");
 178                 return ret;
 179         }
 180
 181         return 0;
 182 }
 183
 184 static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
 185 {
 186         int ret;
 187
 188         if (chip->gpio_chip.ngpio <= 8) {
 189                 ret = i2c_smbus_read_byte_data(chip->client, reg);
 190                 *val = ret;
 191         } else if (chip->gpio_chip.ngpio >= 24) {
 192                 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 193
 194                 ret = i2c_smbus_read_i2c_block_data(chip->client,
 195                                         (reg << bank_shift) | REG_ADDR_AI,
 196                                         NBANK(chip), val);
 197         } else {
 198                 ret = i2c_smbus_read_word_data(chip->client, reg << 1);
 199                 val[0] = (u16)ret & 0xFF;
 200                 val[1] = (u16)ret >> 8;
 201         }
 202         if (ret < 0) {
 203                 dev_err(&chip->client->dev, "failed reading register\n");
 204                 return ret;
 205         }
 206
 207         return 0;
 208 }
 209
 210 static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
 211 {
 212         struct pca953x_chip *chip = to_pca(gc);
 213         u8 reg_val;
 214         int ret, offset = 0;
 215
 216         mutex_lock(&chip->i2c_lock);
 217         reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));
 218
 219         switch (chip->chip_type) {
 220         case PCA953X_TYPE:
 221                 offset = PCA953X_DIRECTION;
 222                 break;
 223         case PCA957X_TYPE:
 224                 offset = PCA957X_CFG;
 225                 break;
 226         }
 227         ret = pca953x_write_single(chip, offset, reg_val, off);
 228         if (ret)
 229                 goto exit;
 230
 231         chip->reg_direction[off / BANK_SZ] = reg_val;
 232         ret = 0;
 233 exit:
 234         mutex_unlock(&chip->i2c_lock);
 235         return ret;
 236 }
 237
 238 static int pca953x_gpio_direction_output(struct gpio_chip *gc,
 239                 unsigned off, int val)
 240 {
 241         struct pca953x_chip *chip = to_pca(gc);
 242         u8 reg_val;
 243         int ret, offset = 0;
 244
 245         mutex_lock(&chip->i2c_lock);
 246         /* set output level */
 247         if (val)
 248                 reg_val = chip->reg_output[off / BANK_SZ]
 249                         | (1u << (off % BANK_SZ));
 250         else
 251                 reg_val = chip->reg_output[off / BANK_SZ]
 252                         & ~(1u << (off % BANK_SZ));
 253
 254         switch (chip->chip_type) {
 255         case PCA953X_TYPE:
 256                 offset = PCA953X_OUTPUT;
 257                 break;
 258         case PCA957X_TYPE:
 259                 offset = PCA957X_OUT;
 260                 break;
 261         }
 262         ret = pca953x_write_single(chip, offset, reg_val, off);
 263         if (ret)
 264                 goto exit;
 265
 266         chip->reg_output[off / BANK_SZ] = reg_val;
 267
 268         /* then direction */
 269         reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
 270         switch (chip->chip_type) {
 271         case PCA953X_TYPE:
 272                 offset = PCA953X_DIRECTION;
 273                 break;
 274         case PCA957X_TYPE:
 275                 offset = PCA957X_CFG;
 276                 break;
 277         }
 278         ret = pca953x_write_single(chip, offset, reg_val, off);
 279         if (ret)
 280                 goto exit;
 281
 282         chip->reg_direction[off / BANK_SZ] = reg_val;
 283         ret = 0;
 284 exit:
 285         mutex_unlock(&chip->i2c_lock);
 286         return ret;
 287 }
 288
 289 static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
 290 {
 291         struct pca953x_chip *chip = to_pca(gc);
 292         u32 reg_val;
 293         int ret, offset = 0;
 294
 295         mutex_lock(&chip->i2c_lock);
 296         switch (chip->chip_type) {
 297         case PCA953X_TYPE:
 298                 offset = PCA953X_INPUT;
 299                 break;
 300         case PCA957X_TYPE:
 301                 offset = PCA957X_IN;
 302                 break;
 303         }
 304         ret = pca953x_read_single(chip, offset, &reg_val, off);
 305         mutex_unlock(&chip->i2c_lock);
 306         if (ret < 0) {
 307                 /* NOTE:  diagnostic already emitted; that's all we should
 308                  * do unless gpio_*_value_cansleep() calls become different
 309                  * from their nonsleeping siblings (and report faults).
 310                  */
 311                 return 0;
 312         }
 313
 314         return (reg_val & (1u << (off % BANK_SZ))) ? 1 : 0;
 315 }
 316
 317 static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
 318 {
 319         struct pca953x_chip *chip = to_pca(gc);
 320         u8 reg_val;
 321         int ret, offset = 0;
 322
 323         mutex_lock(&chip->i2c_lock);
 324         if (val)
 325                 reg_val = chip->reg_output[off / BANK_SZ]
 326                         | (1u << (off % BANK_SZ));
 327         else
 328                 reg_val = chip->reg_output[off / BANK_SZ]
 329                         & ~(1u << (off % BANK_SZ));
 330
 331         switch (chip->chip_type) {
 332         case PCA953X_TYPE:
 333                 offset = PCA953X_OUTPUT;
 334                 break;
 335         case PCA957X_TYPE:
 336                 offset = PCA957X_OUT;
 337                 break;
 338         }
 339         ret = pca953x_write_single(chip, offset, reg_val, off);
 340         if (ret)
 341                 goto exit;
 342
 343         chip->reg_output[off / BANK_SZ] = reg_val;
 344 exit:
 345         mutex_unlock(&chip->i2c_lock);
 346 }
 347
 348 static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
 349 {
 350         struct gpio_chip *gc;
 351
 352         gc = &chip->gpio_chip;
 353
 354         gc->direction_input  = pca953x_gpio_direction_input;
 355         gc->direction_output = pca953x_gpio_direction_output;
 356         gc->get = pca953x_gpio_get_value;
 357         gc->set = pca953x_gpio_set_value;
 358         gc->can_sleep = true;
 359
 360         gc->base = chip->gpio_start;
 361         gc->ngpio = gpios;
 362         gc->label = chip->client->name;
 363         gc->dev = &chip->client->dev;
 364         gc->owner = THIS_MODULE;
 365         gc->names = chip->names;
 366 }
 367
 368 #ifdef CONFIG_GPIO_PCA953X_IRQ
 369 static void pca953x_irq_mask(struct irq_data *d)
 370 {
 371         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 372         struct pca953x_chip *chip = to_pca(gc);
 373
 374         chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));
 375 }
 376
 377 static void pca953x_irq_unmask(struct irq_data *d)
 378 {
 379         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 380         struct pca953x_chip *chip = to_pca(gc);
 381
 382         chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
 383 }
 384
 385 static void pca953x_irq_bus_lock(struct irq_data *d)
 386 {
 387         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 388         struct pca953x_chip *chip = to_pca(gc);
 389
 390         mutex_lock(&chip->irq_lock);
 391 }
 392
 393 static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
 394 {
 395         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 396         struct pca953x_chip *chip = to_pca(gc);
 397         u8 new_irqs;
 398         int level, i;
 399
 400         /* Look for any newly setup interrupt */
 401         for (i = 0; i < NBANK(chip); i++) {
 402                 new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i];
 403                 new_irqs &= ~chip->reg_direction[i];
 404
 405                 while (new_irqs) {
 406                         level = __ffs(new_irqs);
 407                         pca953x_gpio_direction_input(&chip->gpio_chip,
 408                                                         level + (BANK_SZ * i));
 409                         new_irqs &= ~(1 << level);
 410                 }
 411         }
 412
 413         mutex_unlock(&chip->irq_lock);
 414 }
 415
 416 static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
 417 {
 418         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 419         struct pca953x_chip *chip = to_pca(gc);
 420         int bank_nb = d->hwirq / BANK_SZ;
 421         u8 mask = 1 << (d->hwirq % BANK_SZ);
 422
 423         if (!(type & IRQ_TYPE_EDGE_BOTH)) {
 424                 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
 425                         d->irq, type);
 426                 return -EINVAL;
 427         }
 428
 429         if (type & IRQ_TYPE_EDGE_FALLING)
 430                 chip->irq_trig_fall[bank_nb] |= mask;
 431         else
 432                 chip->irq_trig_fall[bank_nb] &= ~mask;
 433
 434         if (type & IRQ_TYPE_EDGE_RISING)
 435                 chip->irq_trig_raise[bank_nb] |= mask;
 436         else
 437                 chip->irq_trig_raise[bank_nb] &= ~mask;
 438
 439         return 0;
 440 }
 441
 442 static struct irq_chip pca953x_irq_chip = {
 443         .name                   = "pca953x",
 444         .irq_mask               = pca953x_irq_mask,
 445         .irq_unmask             = pca953x_irq_unmask,
 446         .irq_bus_lock           = pca953x_irq_bus_lock,
 447         .irq_bus_sync_unlock    = pca953x_irq_bus_sync_unlock,
 448         .irq_set_type           = pca953x_irq_set_type,
 449 };
 450
 451 static bool pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
 452 {
 453         u8 cur_stat[MAX_BANK];
 454         u8 old_stat[MAX_BANK];
 455         bool pending_seen = false;
 456         bool trigger_seen = false;
 457         u8 trigger[MAX_BANK];
 458         int ret, i, offset = 0;
 459
 460         switch (chip->chip_type) {
 461         case PCA953X_TYPE:
 462                 offset = PCA953X_INPUT;
 463                 break;
 464         case PCA957X_TYPE:
 465                 offset = PCA957X_IN;
 466                 break;
 467         }
 468         ret = pca953x_read_regs(chip, offset, cur_stat);
 469         if (ret)
 470                 return false;
 471
 472         /* Remove output pins from the equation */
 473         for (i = 0; i < NBANK(chip); i++)
 474                 cur_stat[i] &= chip->reg_direction[i];
 475
 476         memcpy(old_stat, chip->irq_stat, NBANK(chip));
 477
 478         for (i = 0; i < NBANK(chip); i++) {
 479                 trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i];
 480                 if (trigger[i])
 481                         trigger_seen = true;
 482         }
 483
 484         if (!trigger_seen)
 485                 return false;
 486
 487         memcpy(chip->irq_stat, cur_stat, NBANK(chip));
 488
 489         for (i = 0; i < NBANK(chip); i++) {
 490                 pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) |
 491                         (cur_stat[i] & chip->irq_trig_raise[i]);
 492                 pending[i] &= trigger[i];
 493                 if (pending[i])
 494                         pending_seen = true;
 495         }
 496
 497         return pending_seen;
 498 }
 499
 500 static irqreturn_t pca953x_irq_handler(int irq, void *devid)
 501 {
 502         struct pca953x_chip *chip = devid;
 503         u8 pending[MAX_BANK];
 504         u8 level;
 505         unsigned nhandled = 0;
 506         int i;
 507
 508         if (!pca953x_irq_pending(chip, pending))
 509                 return IRQ_NONE;
 510
 511         for (i = 0; i < NBANK(chip); i++) {
 512                 while (pending[i]) {
 513                         level = __ffs(pending[i]);
 514                         handle_nested_irq(irq_find_mapping(chip->gpio_chip.irqdomain,
 515                                                         level + (BANK_SZ * i)));
 516                         pending[i] &= ~(1 << level);
 517                         nhandled++;
 518                 }
 519         }
 520
 521         return (nhandled > 0) ? IRQ_HANDLED : IRQ_NONE;
 522 }
 523
 524 static int pca953x_irq_setup(struct pca953x_chip *chip,
 525                              int irq_base)
 526 {
 527         struct i2c_client *client = chip->client;
 528         int ret, i, offset = 0;
 529
 530         if (client->irq && irq_base != -1
 531                         && (chip->driver_data & PCA_INT)) {
 532
 533                 switch (chip->chip_type) {
 534                 case PCA953X_TYPE:
 535                         offset = PCA953X_INPUT;
 536                         break;
 537                 case PCA957X_TYPE:
 538                         offset = PCA957X_IN;
 539                         break;
 540                 }
 541                 ret = pca953x_read_regs(chip, offset, chip->irq_stat);
 542                 if (ret)
 543                         return ret;
 544
 545                 /*
 546                  * There is no way to know which GPIO line generated the
 547                  * interrupt.  We have to rely on the previous read for
 548                  * this purpose.
 549                  */
 550                 for (i = 0; i < NBANK(chip); i++)
 551                         chip->irq_stat[i] &= chip->reg_direction[i];
 552                 mutex_init(&chip->irq_lock);
 553
 554                 ret = devm_request_threaded_irq(&client->dev,
 555                                         client->irq,
 556                                            NULL,
 557                                            pca953x_irq_handler,
 558                                            IRQF_TRIGGER_LOW | IRQF_ONESHOT |
 559                                                    IRQF_SHARED,
 560                                            dev_name(&client->dev), chip);
 561                 if (ret) {
 562                         dev_err(&client->dev, "failed to request irq %d\n",
 563                                 client->irq);
 564                         return ret;
 565                 }
 566
 567                 ret =  gpiochip_irqchip_add(&chip->gpio_chip,
 568                                             &pca953x_irq_chip,
 569                                             irq_base,
 570                                             handle_simple_irq,
 571                                             IRQ_TYPE_NONE);
 572                 if (ret) {
 573                         dev_err(&client->dev,
 574                                 "could not connect irqchip to gpiochip\n");
 575                         return ret;
 576                 }
 577
 578                 gpiochip_set_chained_irqchip(&chip->gpio_chip,
 579                                              &pca953x_irq_chip,
 580                                              client->irq, NULL);
 581         }
 582
 583         return 0;
 584 }
 585
 586 #else /* CONFIG_GPIO_PCA953X_IRQ */
 587 static int pca953x_irq_setup(struct pca953x_chip *chip,
 588                              int irq_base)
 589 {
 590         struct i2c_client *client = chip->client;
 591
 592         if (irq_base != -1 && (chip->driver_data & PCA_INT))
 593                 dev_warn(&client->dev, "interrupt support not compiled in\n");
 594
 595         return 0;
 596 }
 597 #endif
 598
 599 static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
 600 {
 601         int ret;
 602         u8 val[MAX_BANK];
 603
 604         ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output);
 605         if (ret)
 606                 goto out;
 607
 608         ret = pca953x_read_regs(chip, PCA953X_DIRECTION,
 609                                chip->reg_direction);
 610         if (ret)
 611                 goto out;
 612
 613         /* set platform specific polarity inversion */
 614         if (invert)
 615                 memset(val, 0xFF, NBANK(chip));
 616         else
 617                 memset(val, 0, NBANK(chip));
 618
 619         ret = pca953x_write_regs(chip, PCA953X_INVERT, val);
 620 out:
 621         return ret;
 622 }
 623
 624 static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
 625 {
 626         int ret;
 627         u8 val[MAX_BANK];
 628
 629         ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output);
 630         if (ret)
 631                 goto out;
 632         ret = pca953x_read_regs(chip, PCA957X_CFG, chip->reg_direction);
 633         if (ret)
 634                 goto out;
 635
 636         /* set platform specific polarity inversion */
 637         if (invert)
 638                 memset(val, 0xFF, NBANK(chip));
 639         else
 640                 memset(val, 0, NBANK(chip));
 641         ret = pca953x_write_regs(chip, PCA957X_INVRT, val);
 642         if (ret)
 643                 goto out;
 644
 645         /* To enable register 6, 7 to control pull up and pull down */
 646         memset(val, 0x02, NBANK(chip));
 647         ret = pca953x_write_regs(chip, PCA957X_BKEN, val);
 648         if (ret)
 649                 goto out;
 650
 651         return 0;
 652 out:
 653         return ret;
 654 }
 655
 656 static int pca953x_probe(struct i2c_client *client,
 657                                    const struct i2c_device_id *id)
 658 {
 659         struct pca953x_platform_data *pdata;
 660         struct pca953x_chip *chip;
 661         int irq_base = 0;
 662         int ret;
 663         u32 invert = 0;
 664
 665         chip = devm_kzalloc(&client->dev,
 666                         sizeof(struct pca953x_chip), GFP_KERNEL);
 667         if (chip == NULL)
 668                 return -ENOMEM;
 669
 670         pdata = dev_get_platdata(&client->dev);
 671         if (pdata) {
 672                 irq_base = pdata->irq_base;
 673                 chip->gpio_start = pdata->gpio_base;
 674                 invert = pdata->invert;
 675                 chip->names = pdata->names;
 676         } else {
 677                 chip->gpio_start = -1;
 678                 irq_base = 0;
 679         }
 680
 681         chip->client = client;
 682
 683         chip->driver_data = id->driver_data;
 684         chip->chip_type = PCA_CHIP_TYPE(chip->driver_data);
 685
 686         mutex_init(&chip->i2c_lock);
 687
 688         /* initialize cached registers from their original values.
 689          * we can't share this chip with another i2c master.
 690          */
 691         pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK);
 692
 693         if (chip->chip_type == PCA953X_TYPE)
 694                 ret = device_pca953x_init(chip, invert);
 695         else
 696                 ret = device_pca957x_init(chip, invert);
 697         if (ret)
 698                 return ret;
 699
 700         ret = gpiochip_add(&chip->gpio_chip);
 701         if (ret)
 702                 return ret;
 703
 704         ret = pca953x_irq_setup(chip, irq_base);
 705         if (ret)
 706                 return ret;
 707
 708         if (pdata && pdata->setup) {
 709                 ret = pdata->setup(client, chip->gpio_chip.base,
 710                                 chip->gpio_chip.ngpio, pdata->context);
 711                 if (ret < 0)
 712                         dev_warn(&client->dev, "setup failed, %d\n", ret);
 713         }
 714
 715         i2c_set_clientdata(client, chip);
 716         return 0;
 717 }
 718
 719 static int pca953x_remove(struct i2c_client *client)
 720 {
 721         struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
 722         struct pca953x_chip *chip = i2c_get_clientdata(client);
 723         int ret = 0;
 724
 725         if (pdata && pdata->teardown) {
 726                 ret = pdata->teardown(client, chip->gpio_chip.base,
 727                                 chip->gpio_chip.ngpio, pdata->context);
 728                 if (ret < 0) {
 729                         dev_err(&client->dev, "%s failed, %d\n",
 730                                         "teardown", ret);
 731                         return ret;
 732                 }
 733         }
 734
 735         gpiochip_remove(&chip->gpio_chip);
 736
 737         return 0;
 738 }
 739
 740 static const struct of_device_id pca953x_dt_ids[] = {
 741         { .compatible = "nxp,pca9505", },
 742         { .compatible = "nxp,pca9534", },
 743         { .compatible = "nxp,pca9535", },
 744         { .compatible = "nxp,pca9536", },
 745         { .compatible = "nxp,pca9537", },
 746         { .compatible = "nxp,pca9538", },
 747         { .compatible = "nxp,pca9539", },
 748         { .compatible = "nxp,pca9554", },
 749         { .compatible = "nxp,pca9555", },
 750         { .compatible = "nxp,pca9556", },
 751         { .compatible = "nxp,pca9557", },
 752         { .compatible = "nxp,pca9574", },
 753         { .compatible = "nxp,pca9575", },
 754         { .compatible = "nxp,pca9698", },
 755
 756         { .compatible = "maxim,max7310", },
 757         { .compatible = "maxim,max7312", },
 758         { .compatible = "maxim,max7313", },
 759         { .compatible = "maxim,max7315", },
 760
 761         { .compatible = "ti,pca6107", },
 762         { .compatible = "ti,tca6408", },
 763         { .compatible = "ti,tca6416", },
 764         { .compatible = "ti,tca6424", },
 765
 766         { .compatible = "exar,xra1202", },
 767         { }
 768 };
 769
 770 MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
 771
 772 static struct i2c_driver pca953x_driver = {
 773         .driver = {
 774                 .name   = "pca953x",
 775                 .of_match_table = pca953x_dt_ids,
 776         },
 777         .probe          = pca953x_probe,
 778         .remove         = pca953x_remove,
 779         .id_table       = pca953x_id,
 780 };
 781
 782 static int __init pca953x_init(void)
 783 {
 784         return i2c_add_driver(&pca953x_driver);
 785 }
 786 /* register after i2c postcore initcall and before
 787  * subsys initcalls that may rely on these GPIOs
 788  */
 789 subsys_initcall(pca953x_init);
 790
 791 static void __exit pca953x_exit(void)
 792 {
 793         i2c_del_driver(&pca953x_driver);
 794 }
 795 module_exit(pca953x_exit);
 796
 797 MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
 798 MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
 799 MODULE_LICENSE("GPL");