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 #include <linux/acpi.h>
  25
  26 #define PCA953X_INPUT           0
  27 #define PCA953X_OUTPUT          1
  28 #define PCA953X_INVERT          2
  29 #define PCA953X_DIRECTION       3
  30
  31 #define REG_ADDR_AI             0x80
  32
  33 #define PCA957X_IN              0
  34 #define PCA957X_INVRT           1
  35 #define PCA957X_BKEN            2
  36 #define PCA957X_PUPD            3
  37 #define PCA957X_CFG             4
  38 #define PCA957X_OUT             5
  39 #define PCA957X_MSK             6
  40 #define PCA957X_INTS            7
  41
  42 #define PCA_GPIO_MASK           0x00FF
  43 #define PCA_INT                 0x0100
  44 #define PCA953X_TYPE            0x1000
  45 #define PCA957X_TYPE            0x2000
  46 #define PCA_TYPE_MASK           0xF000
  47
  48 #define PCA_CHIP_TYPE(x)        ((x) & PCA_TYPE_MASK)
  49
  50 static const struct i2c_device_id pca953x_id[] = {
  51         { "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
  52         { "pca9534", 8  | PCA953X_TYPE | PCA_INT, },
  53         { "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
  54         { "pca9536", 4  | PCA953X_TYPE, },
  55         { "pca9537", 4  | PCA953X_TYPE | PCA_INT, },
  56         { "pca9538", 8  | PCA953X_TYPE | PCA_INT, },
  57         { "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
  58         { "pca9554", 8  | PCA953X_TYPE | PCA_INT, },
  59         { "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
  60         { "pca9556", 8  | PCA953X_TYPE, },
  61         { "pca9557", 8  | PCA953X_TYPE, },
  62         { "pca9574", 8  | PCA957X_TYPE | PCA_INT, },
  63         { "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
  64         { "pca9698", 40 | PCA953X_TYPE, },
  65
  66         { "max7310", 8  | PCA953X_TYPE, },
  67         { "max7312", 16 | PCA953X_TYPE | PCA_INT, },
  68         { "max7313", 16 | PCA953X_TYPE | PCA_INT, },
  69         { "max7315", 8  | PCA953X_TYPE | PCA_INT, },
  70         { "pca6107", 8  | PCA953X_TYPE | PCA_INT, },
  71         { "tca6408", 8  | PCA953X_TYPE | PCA_INT, },
  72         { "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
  73         { "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
  74         { "tca9539", 16 | PCA953X_TYPE | PCA_INT, },
  75         { "xra1202", 8  | PCA953X_TYPE },
  76         { }
  77 };
  78 MODULE_DEVICE_TABLE(i2c, pca953x_id);
  79
  80 static const struct acpi_device_id pca953x_acpi_ids[] = {
  81         { "INT3491", 16 | PCA953X_TYPE | PCA_INT, },
  82         { }
  83 };
  84 MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);
  85
  86 #define MAX_BANK 5
  87 #define BANK_SZ 8
  88
  89 #define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)
  90
  91 struct pca953x_chip {
  92         unsigned gpio_start;
  93         u8 reg_output[MAX_BANK];
  94         u8 reg_direction[MAX_BANK];
  95         struct mutex i2c_lock;
  96
  97 #ifdef CONFIG_GPIO_PCA953X_IRQ
  98         struct mutex irq_lock;
  99         u8 irq_mask[MAX_BANK];
 100         u8 irq_stat[MAX_BANK];
 101         u8 irq_trig_raise[MAX_BANK];
 102         u8 irq_trig_fall[MAX_BANK];
 103 #endif
 104
 105         struct i2c_client *client;
 106         struct gpio_chip gpio_chip;
 107         const char *const *names;
 108         int     chip_type;
 109         unsigned long driver_data;
 110 };
 111
 112 static inline struct pca953x_chip *to_pca(struct gpio_chip *gc)
 113 {
 114         return container_of(gc, struct pca953x_chip, gpio_chip);
 115 }
 116
 117 static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
 118                                 int off)
 119 {
 120         int ret;
 121         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 122         int offset = off / BANK_SZ;
 123
 124         ret = i2c_smbus_read_byte_data(chip->client,
 125                                 (reg << bank_shift) + offset);
 126         *val = ret;
 127
 128         if (ret < 0) {
 129                 dev_err(&chip->client->dev, "failed reading register\n");
 130                 return ret;
 131         }
 132
 133         return 0;
 134 }
 135
 136 static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
 137                                 int off)
 138 {
 139         int ret = 0;
 140         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 141         int offset = off / BANK_SZ;
 142
 143         ret = i2c_smbus_write_byte_data(chip->client,
 144                                         (reg << bank_shift) + offset, val);
 145
 146         if (ret < 0) {
 147                 dev_err(&chip->client->dev, "failed writing register\n");
 148                 return ret;
 149         }
 150
 151         return 0;
 152 }
 153
 154 static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
 155 {
 156         int ret = 0;
 157
 158         if (chip->gpio_chip.ngpio <= 8)
 159                 ret = i2c_smbus_write_byte_data(chip->client, reg, *val);
 160         else if (chip->gpio_chip.ngpio >= 24) {
 161                 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 162                 ret = i2c_smbus_write_i2c_block_data(chip->client,
 163                                         (reg << bank_shift) | REG_ADDR_AI,
 164                                         NBANK(chip), val);
 165         } else {
 166                 switch (chip->chip_type) {
 167                 case PCA953X_TYPE:
 168                         ret = i2c_smbus_write_word_data(chip->client,
 169                                                         reg << 1, (u16) *val);
 170                         break;
 171                 case PCA957X_TYPE:
 172                         ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
 173                                                         val[0]);
 174                         if (ret < 0)
 175                                 break;
 176                         ret = i2c_smbus_write_byte_data(chip->client,
 177                                                         (reg << 1) + 1,
 178                                                         val[1]);
 179                         break;
 180                 }
 181         }
 182
 183         if (ret < 0) {
 184                 dev_err(&chip->client->dev, "failed writing register\n");
 185                 return ret;
 186         }
 187
 188         return 0;
 189 }
 190
 191 static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
 192 {
 193         int ret;
 194
 195         if (chip->gpio_chip.ngpio <= 8) {
 196                 ret = i2c_smbus_read_byte_data(chip->client, reg);
 197                 *val = ret;
 198         } else if (chip->gpio_chip.ngpio >= 24) {
 199                 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 200
 201                 ret = i2c_smbus_read_i2c_block_data(chip->client,
 202                                         (reg << bank_shift) | REG_ADDR_AI,
 203                                         NBANK(chip), val);
 204         } else {
 205                 ret = i2c_smbus_read_word_data(chip->client, reg << 1);
 206                 val[0] = (u16)ret & 0xFF;
 207                 val[1] = (u16)ret >> 8;
 208         }
 209         if (ret < 0) {
 210                 dev_err(&chip->client->dev, "failed reading register\n");
 211                 return ret;
 212         }
 213
 214         return 0;
 215 }
 216
 217 static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
 218 {
 219         struct pca953x_chip *chip = to_pca(gc);
 220         u8 reg_val;
 221         int ret, offset = 0;
 222
 223         mutex_lock(&chip->i2c_lock);
 224         reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));
 225
 226         switch (chip->chip_type) {
 227         case PCA953X_TYPE:
 228                 offset = PCA953X_DIRECTION;
 229                 break;
 230         case PCA957X_TYPE:
 231                 offset = PCA957X_CFG;
 232                 break;
 233         }
 234         ret = pca953x_write_single(chip, offset, reg_val, off);
 235         if (ret)
 236                 goto exit;
 237
 238         chip->reg_direction[off / BANK_SZ] = reg_val;
 239         ret = 0;
 240 exit:
 241         mutex_unlock(&chip->i2c_lock);
 242         return ret;
 243 }
 244
 245 static int pca953x_gpio_direction_output(struct gpio_chip *gc,
 246                 unsigned off, int val)
 247 {
 248         struct pca953x_chip *chip = to_pca(gc);
 249         u8 reg_val;
 250         int ret, offset = 0;
 251
 252         mutex_lock(&chip->i2c_lock);
 253         /* set output level */
 254         if (val)
 255                 reg_val = chip->reg_output[off / BANK_SZ]
 256                         | (1u << (off % BANK_SZ));
 257         else
 258                 reg_val = chip->reg_output[off / BANK_SZ]
 259                         & ~(1u << (off % BANK_SZ));
 260
 261         switch (chip->chip_type) {
 262         case PCA953X_TYPE:
 263                 offset = PCA953X_OUTPUT;
 264                 break;
 265         case PCA957X_TYPE:
 266                 offset = PCA957X_OUT;
 267                 break;
 268         }
 269         ret = pca953x_write_single(chip, offset, reg_val, off);
 270         if (ret)
 271                 goto exit;
 272
 273         chip->reg_output[off / BANK_SZ] = reg_val;
 274
 275         /* then direction */
 276         reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
 277         switch (chip->chip_type) {
 278         case PCA953X_TYPE:
 279                 offset = PCA953X_DIRECTION;
 280                 break;
 281         case PCA957X_TYPE:
 282                 offset = PCA957X_CFG;
 283                 break;
 284         }
 285         ret = pca953x_write_single(chip, offset, reg_val, off);
 286         if (ret)
 287                 goto exit;
 288
 289         chip->reg_direction[off / BANK_SZ] = reg_val;
 290         ret = 0;
 291 exit:
 292         mutex_unlock(&chip->i2c_lock);
 293         return ret;
 294 }
 295
 296 static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
 297 {
 298         struct pca953x_chip *chip = to_pca(gc);
 299         u32 reg_val;
 300         int ret, offset = 0;
 301
 302         mutex_lock(&chip->i2c_lock);
 303         switch (chip->chip_type) {
 304         case PCA953X_TYPE:
 305                 offset = PCA953X_INPUT;
 306                 break;
 307         case PCA957X_TYPE:
 308                 offset = PCA957X_IN;
 309                 break;
 310         }
 311         ret = pca953x_read_single(chip, offset, &reg_val, off);
 312         mutex_unlock(&chip->i2c_lock);
 313         if (ret < 0) {
 314                 /* NOTE:  diagnostic already emitted; that's all we should
 315                  * do unless gpio_*_value_cansleep() calls become different
 316                  * from their nonsleeping siblings (and report faults).
 317                  */
 318                 return 0;
 319         }
 320
 321         return (reg_val & (1u << (off % BANK_SZ))) ? 1 : 0;
 322 }
 323
 324 static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
 325 {
 326         struct pca953x_chip *chip = to_pca(gc);
 327         u8 reg_val;
 328         int ret, offset = 0;
 329
 330         mutex_lock(&chip->i2c_lock);
 331         if (val)
 332                 reg_val = chip->reg_output[off / BANK_SZ]
 333                         | (1u << (off % BANK_SZ));
 334         else
 335                 reg_val = chip->reg_output[off / BANK_SZ]
 336                         & ~(1u << (off % BANK_SZ));
 337
 338         switch (chip->chip_type) {
 339         case PCA953X_TYPE:
 340                 offset = PCA953X_OUTPUT;
 341                 break;
 342         case PCA957X_TYPE:
 343                 offset = PCA957X_OUT;
 344                 break;
 345         }
 346         ret = pca953x_write_single(chip, offset, reg_val, off);
 347         if (ret)
 348                 goto exit;
 349
 350         chip->reg_output[off / BANK_SZ] = reg_val;
 351 exit:
 352         mutex_unlock(&chip->i2c_lock);
 353 }
 354
 355 static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
 356 {
 357         struct gpio_chip *gc;
 358
 359         gc = &chip->gpio_chip;
 360
 361         gc->direction_input  = pca953x_gpio_direction_input;
 362         gc->direction_output = pca953x_gpio_direction_output;
 363         gc->get = pca953x_gpio_get_value;
 364         gc->set = pca953x_gpio_set_value;
 365         gc->can_sleep = true;
 366
 367         gc->base = chip->gpio_start;
 368         gc->ngpio = gpios;
 369         gc->label = chip->client->name;
 370         gc->dev = &chip->client->dev;
 371         gc->owner = THIS_MODULE;
 372         gc->names = chip->names;
 373 }
 374
 375 #ifdef CONFIG_GPIO_PCA953X_IRQ
 376 static void pca953x_irq_mask(struct irq_data *d)
 377 {
 378         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 379         struct pca953x_chip *chip = to_pca(gc);
 380
 381         chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));
 382 }
 383
 384 static void pca953x_irq_unmask(struct irq_data *d)
 385 {
 386         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 387         struct pca953x_chip *chip = to_pca(gc);
 388
 389         chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
 390 }
 391
 392 static void pca953x_irq_bus_lock(struct irq_data *d)
 393 {
 394         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 395         struct pca953x_chip *chip = to_pca(gc);
 396
 397         mutex_lock(&chip->irq_lock);
 398 }
 399
 400 static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
 401 {
 402         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 403         struct pca953x_chip *chip = to_pca(gc);
 404         u8 new_irqs;
 405         int level, i;
 406
 407         /* Look for any newly setup interrupt */
 408         for (i = 0; i < NBANK(chip); i++) {
 409                 new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i];
 410                 new_irqs &= ~chip->reg_direction[i];
 411
 412                 while (new_irqs) {
 413                         level = __ffs(new_irqs);
 414                         pca953x_gpio_direction_input(&chip->gpio_chip,
 415                                                         level + (BANK_SZ * i));
 416                         new_irqs &= ~(1 << level);
 417                 }
 418         }
 419
 420         mutex_unlock(&chip->irq_lock);
 421 }
 422
 423 static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
 424 {
 425         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 426         struct pca953x_chip *chip = to_pca(gc);
 427         int bank_nb = d->hwirq / BANK_SZ;
 428         u8 mask = 1 << (d->hwirq % BANK_SZ);
 429
 430         if (!(type & IRQ_TYPE_EDGE_BOTH)) {
 431                 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
 432                         d->irq, type);
 433                 return -EINVAL;
 434         }
 435
 436         if (type & IRQ_TYPE_EDGE_FALLING)
 437                 chip->irq_trig_fall[bank_nb] |= mask;
 438         else
 439                 chip->irq_trig_fall[bank_nb] &= ~mask;
 440
 441         if (type & IRQ_TYPE_EDGE_RISING)
 442                 chip->irq_trig_raise[bank_nb] |= mask;
 443         else
 444                 chip->irq_trig_raise[bank_nb] &= ~mask;
 445
 446         return 0;
 447 }
 448
 449 static struct irq_chip pca953x_irq_chip = {
 450         .name                   = "pca953x",
 451         .irq_mask               = pca953x_irq_mask,
 452         .irq_unmask             = pca953x_irq_unmask,
 453         .irq_bus_lock           = pca953x_irq_bus_lock,
 454         .irq_bus_sync_unlock    = pca953x_irq_bus_sync_unlock,
 455         .irq_set_type           = pca953x_irq_set_type,
 456 };
 457
 458 static bool pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
 459 {
 460         u8 cur_stat[MAX_BANK];
 461         u8 old_stat[MAX_BANK];
 462         bool pending_seen = false;
 463         bool trigger_seen = false;
 464         u8 trigger[MAX_BANK];
 465         int ret, i, offset = 0;
 466
 467         switch (chip->chip_type) {
 468         case PCA953X_TYPE:
 469                 offset = PCA953X_INPUT;
 470                 break;
 471         case PCA957X_TYPE:
 472                 offset = PCA957X_IN;
 473                 break;
 474         }
 475         ret = pca953x_read_regs(chip, offset, cur_stat);
 476         if (ret)
 477                 return false;
 478
 479         /* Remove output pins from the equation */
 480         for (i = 0; i < NBANK(chip); i++)
 481                 cur_stat[i] &= chip->reg_direction[i];
 482
 483         memcpy(old_stat, chip->irq_stat, NBANK(chip));
 484
 485         for (i = 0; i < NBANK(chip); i++) {
 486                 trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i];
 487                 if (trigger[i])
 488                         trigger_seen = true;
 489         }
 490
 491         if (!trigger_seen)
 492                 return false;
 493
 494         memcpy(chip->irq_stat, cur_stat, NBANK(chip));
 495
 496         for (i = 0; i < NBANK(chip); i++) {
 497                 pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) |
 498                         (cur_stat[i] & chip->irq_trig_raise[i]);
 499                 pending[i] &= trigger[i];
 500                 if (pending[i])
 501                         pending_seen = true;
 502         }
 503
 504         return pending_seen;
 505 }
 506
 507 static irqreturn_t pca953x_irq_handler(int irq, void *devid)
 508 {
 509         struct pca953x_chip *chip = devid;
 510         u8 pending[MAX_BANK];
 511         u8 level;
 512         unsigned nhandled = 0;
 513         int i;
 514
 515         if (!pca953x_irq_pending(chip, pending))
 516                 return IRQ_NONE;
 517
 518         for (i = 0; i < NBANK(chip); i++) {
 519                 while (pending[i]) {
 520                         level = __ffs(pending[i]);
 521                         handle_nested_irq(irq_find_mapping(chip->gpio_chip.irqdomain,
 522                                                         level + (BANK_SZ * i)));
 523                         pending[i] &= ~(1 << level);
 524                         nhandled++;
 525                 }
 526         }
 527
 528         return (nhandled > 0) ? IRQ_HANDLED : IRQ_NONE;
 529 }
 530
 531 static int pca953x_irq_setup(struct pca953x_chip *chip,
 532                              int irq_base)
 533 {
 534         struct i2c_client *client = chip->client;
 535         int ret, i, offset = 0;
 536
 537         if (client->irq && irq_base != -1
 538                         && (chip->driver_data & PCA_INT)) {
 539
 540                 switch (chip->chip_type) {
 541                 case PCA953X_TYPE:
 542                         offset = PCA953X_INPUT;
 543                         break;
 544                 case PCA957X_TYPE:
 545                         offset = PCA957X_IN;
 546                         break;
 547                 }
 548                 ret = pca953x_read_regs(chip, offset, chip->irq_stat);
 549                 if (ret)
 550                         return ret;
 551
 552                 /*
 553                  * There is no way to know which GPIO line generated the
 554                  * interrupt.  We have to rely on the previous read for
 555                  * this purpose.
 556                  */
 557                 for (i = 0; i < NBANK(chip); i++)
 558                         chip->irq_stat[i] &= chip->reg_direction[i];
 559                 mutex_init(&chip->irq_lock);
 560
 561                 ret = devm_request_threaded_irq(&client->dev,
 562                                         client->irq,
 563                                            NULL,
 564                                            pca953x_irq_handler,
 565                                            IRQF_TRIGGER_LOW | IRQF_ONESHOT |
 566                                                    IRQF_SHARED,
 567                                            dev_name(&client->dev), chip);
 568                 if (ret) {
 569                         dev_err(&client->dev, "failed to request irq %d\n",
 570                                 client->irq);
 571                         return ret;
 572                 }
 573
 574                 ret =  gpiochip_irqchip_add(&chip->gpio_chip,
 575                                             &pca953x_irq_chip,
 576                                             irq_base,
 577                                             handle_simple_irq,
 578                                             IRQ_TYPE_NONE);
 579                 if (ret) {
 580                         dev_err(&client->dev,
 581                                 "could not connect irqchip to gpiochip\n");
 582                         return ret;
 583                 }
 584
 585                 gpiochip_set_chained_irqchip(&chip->gpio_chip,
 586                                              &pca953x_irq_chip,
 587                                              client->irq, NULL);
 588         }
 589
 590         return 0;
 591 }
 592
 593 #else /* CONFIG_GPIO_PCA953X_IRQ */
 594 static int pca953x_irq_setup(struct pca953x_chip *chip,
 595                              int irq_base)
 596 {
 597         struct i2c_client *client = chip->client;
 598
 599         if (irq_base != -1 && (chip->driver_data & PCA_INT))
 600                 dev_warn(&client->dev, "interrupt support not compiled in\n");
 601
 602         return 0;
 603 }
 604 #endif
 605
 606 static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
 607 {
 608         int ret;
 609         u8 val[MAX_BANK];
 610
 611         ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output);
 612         if (ret)
 613                 goto out;
 614
 615         ret = pca953x_read_regs(chip, PCA953X_DIRECTION,
 616                                chip->reg_direction);
 617         if (ret)
 618                 goto out;
 619
 620         /* set platform specific polarity inversion */
 621         if (invert)
 622                 memset(val, 0xFF, NBANK(chip));
 623         else
 624                 memset(val, 0, NBANK(chip));
 625
 626         ret = pca953x_write_regs(chip, PCA953X_INVERT, val);
 627 out:
 628         return ret;
 629 }
 630
 631 static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
 632 {
 633         int ret;
 634         u8 val[MAX_BANK];
 635
 636         ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output);
 637         if (ret)
 638                 goto out;
 639         ret = pca953x_read_regs(chip, PCA957X_CFG, chip->reg_direction);
 640         if (ret)
 641                 goto out;
 642
 643         /* set platform specific polarity inversion */
 644         if (invert)
 645                 memset(val, 0xFF, NBANK(chip));
 646         else
 647                 memset(val, 0, NBANK(chip));
 648         ret = pca953x_write_regs(chip, PCA957X_INVRT, val);
 649         if (ret)
 650                 goto out;
 651
 652         /* To enable register 6, 7 to control pull up and pull down */
 653         memset(val, 0x02, NBANK(chip));
 654         ret = pca953x_write_regs(chip, PCA957X_BKEN, val);
 655         if (ret)
 656                 goto out;
 657
 658         return 0;
 659 out:
 660         return ret;
 661 }
 662
 663 static int pca953x_probe(struct i2c_client *client,
 664                                    const struct i2c_device_id *id)
 665 {
 666         struct pca953x_platform_data *pdata;
 667         struct pca953x_chip *chip;
 668         int irq_base = 0;
 669         int ret;
 670         u32 invert = 0;
 671
 672         chip = devm_kzalloc(&client->dev,
 673                         sizeof(struct pca953x_chip), GFP_KERNEL);
 674         if (chip == NULL)
 675                 return -ENOMEM;
 676
 677         pdata = dev_get_platdata(&client->dev);
 678         if (pdata) {
 679                 irq_base = pdata->irq_base;
 680                 chip->gpio_start = pdata->gpio_base;
 681                 invert = pdata->invert;
 682                 chip->names = pdata->names;
 683         } else {
 684                 chip->gpio_start = -1;
 685                 irq_base = 0;
 686         }
 687
 688         chip->client = client;
 689
 690         if (id) {
 691                 chip->driver_data = id->driver_data;
 692         } else {
 693                 const struct acpi_device_id *id;
 694
 695                 id = acpi_match_device(pca953x_acpi_ids, &client->dev);
 696                 if (!id)
 697                         return -ENODEV;
 698
 699                 chip->driver_data = id->driver_data;
 700         }
 701
 702         chip->chip_type = PCA_CHIP_TYPE(chip->driver_data);
 703
 704         mutex_init(&chip->i2c_lock);
 705
 706         /* initialize cached registers from their original values.
 707          * we can't share this chip with another i2c master.
 708          */
 709         pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK);
 710
 711         if (chip->chip_type == PCA953X_TYPE)
 712                 ret = device_pca953x_init(chip, invert);
 713         else
 714                 ret = device_pca957x_init(chip, invert);
 715         if (ret)
 716                 return ret;
 717
 718         ret = gpiochip_add(&chip->gpio_chip);
 719         if (ret)
 720                 return ret;
 721
 722         ret = pca953x_irq_setup(chip, irq_base);
 723         if (ret)
 724                 return ret;
 725
 726         if (pdata && pdata->setup) {
 727                 ret = pdata->setup(client, chip->gpio_chip.base,
 728                                 chip->gpio_chip.ngpio, pdata->context);
 729                 if (ret < 0)
 730                         dev_warn(&client->dev, "setup failed, %d\n", ret);
 731         }
 732
 733         i2c_set_clientdata(client, chip);
 734         return 0;
 735 }
 736
 737 static int pca953x_remove(struct i2c_client *client)
 738 {
 739         struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
 740         struct pca953x_chip *chip = i2c_get_clientdata(client);
 741         int ret = 0;
 742
 743         if (pdata && pdata->teardown) {
 744                 ret = pdata->teardown(client, chip->gpio_chip.base,
 745                                 chip->gpio_chip.ngpio, pdata->context);
 746                 if (ret < 0) {
 747                         dev_err(&client->dev, "%s failed, %d\n",
 748                                         "teardown", ret);
 749                         return ret;
 750                 }
 751         }
 752
 753         gpiochip_remove(&chip->gpio_chip);
 754
 755         return 0;
 756 }
 757
 758 static const struct of_device_id pca953x_dt_ids[] = {
 759         { .compatible = "nxp,pca9505", },
 760         { .compatible = "nxp,pca9534", },
 761         { .compatible = "nxp,pca9535", },
 762         { .compatible = "nxp,pca9536", },
 763         { .compatible = "nxp,pca9537", },
 764         { .compatible = "nxp,pca9538", },
 765         { .compatible = "nxp,pca9539", },
 766         { .compatible = "nxp,pca9554", },
 767         { .compatible = "nxp,pca9555", },
 768         { .compatible = "nxp,pca9556", },
 769         { .compatible = "nxp,pca9557", },
 770         { .compatible = "nxp,pca9574", },
 771         { .compatible = "nxp,pca9575", },
 772         { .compatible = "nxp,pca9698", },
 773
 774         { .compatible = "maxim,max7310", },
 775         { .compatible = "maxim,max7312", },
 776         { .compatible = "maxim,max7313", },
 777         { .compatible = "maxim,max7315", },
 778
 779         { .compatible = "ti,pca6107", },
 780         { .compatible = "ti,tca6408", },
 781         { .compatible = "ti,tca6416", },
 782         { .compatible = "ti,tca6424", },
 783
 784         { .compatible = "exar,xra1202", },
 785         { }
 786 };
 787
 788 MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
 789
 790 static struct i2c_driver pca953x_driver = {
 791         .driver = {
 792                 .name   = "pca953x",
 793                 .of_match_table = pca953x_dt_ids,
 794                 .acpi_match_table = ACPI_PTR(pca953x_acpi_ids),
 795         },
 796         .probe          = pca953x_probe,
 797         .remove         = pca953x_remove,
 798         .id_table       = pca953x_id,
 799 };
 800
 801 static int __init pca953x_init(void)
 802 {
 803         return i2c_add_driver(&pca953x_driver);
 804 }
 805 /* register after i2c postcore initcall and before
 806  * subsys initcalls that may rely on these GPIOs
 807  */
 808 subsys_initcall(pca953x_init);
 809
 810 static void __exit pca953x_exit(void)
 811 {
 812         i2c_del_driver(&pca953x_driver);
 813 }
 814 module_exit(pca953x_exit);
 815
 816 MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
 817 MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
 818 MODULE_LICENSE("GPL");