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
  46 static 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 };
  73 MODULE_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
  80 struct 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
 100 static inline struct pca953x_chip *to_pca(struct gpio_chip *gc)
 101 {
 102         return container_of(gc, struct pca953x_chip, gpio_chip);
 103 }
 104
 105 static 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
 124 static 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
 142 static 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
 179 static 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
 205 static 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;
 228 exit:
 229         mutex_unlock(&chip->i2c_lock);
 230         return ret;
 231 }
 232
 233 static 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;
 279 exit:
 280         mutex_unlock(&chip->i2c_lock);
 281         return ret;
 282 }
 283
 284 static 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
 312 static 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;
 339 exit:
 340         mutex_unlock(&chip->i2c_lock);
 341 }
 342
 343 static 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
 364 static 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
 372 static 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
 380 static 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
 388 static 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
 411 static 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
 437 static 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
 446 static 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
 492 static 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
 516 static 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         struct gpio_chip *gpio_chip = &chip->gpio_chip;
 522         int ret, i, offset = 0;
 523
 524         if (irq_base != -1
 525                         && (id->driver_data & PCA_INT)) {
 526
 527                 switch (chip->chip_type) {
 528                 case PCA953X_TYPE:
 529                         offset = PCA953X_INPUT;
 530                         break;
 531                 case PCA957X_TYPE:
 532                         offset = PCA957X_IN;
 533                         break;
 534                 }
 535                 ret = pca953x_read_regs(chip, offset, chip->irq_stat);
 536                 if (ret)
 537                         return ret;
 538
 539                 /*
 540                  * There is no way to know which GPIO line generated the
 541                  * interrupt.  We have to rely on the previous read for
 542                  * this purpose.
 543                  */
 544                 for (i = 0; i < NBANK(chip); i++)
 545                         chip->irq_stat[i] &= chip->reg_direction[i];
 546                 mutex_init(&chip->irq_lock);
 547
 548                 ret = devm_request_threaded_irq(&client->dev,
 549                                         client->irq,
 550                                            NULL,
 551                                            pca953x_irq_handler,
 552                                            IRQF_TRIGGER_LOW | IRQF_ONESHOT |
 553                                                    IRQF_SHARED,
 554                                            dev_name(&client->dev), chip);
 555                 if (ret) {
 556                         dev_err(&client->dev, "failed to request irq %d\n",
 557                                 client->irq);
 558                         return ret;
 559                 }
 560
 561                 ret =  gpiochip_irqchip_add(&chip->gpio_chip,
 562                                             &pca953x_irq_chip,
 563                                             irq_base,
 564                                             handle_simple_irq,
 565                                             IRQ_TYPE_NONE);
 566                 if (ret) {
 567                         dev_err(&client->dev,
 568                                 "could not connect irqchip to gpiochip\n");
 569                         return ret;
 570                 }
 571
 572                 for (i = 0; i < NBANK(chip); i++) {
 573                         int j;
 574
 575                         for (j = 0; j < BANK_SZ; j++) {
 576                                 int gpio = gpio_chip->base + i * BANK_SZ + j;
 577                                 int irq = gpio_to_irq(gpio);
 578
 579                                 irq_set_parent(irq, client->irq);
 580                         }
 581                 }
 582         }
 583
 584         return 0;
 585 }
 586
 587 #else /* CONFIG_GPIO_PCA953X_IRQ */
 588 static int pca953x_irq_setup(struct pca953x_chip *chip,
 589                              const struct i2c_device_id *id,
 590                              int irq_base)
 591 {
 592         struct i2c_client *client = chip->client;
 593
 594         if (irq_base != -1 && (id->driver_data & PCA_INT))
 595                 dev_warn(&client->dev, "interrupt support not compiled in\n");
 596
 597         return 0;
 598 }
 599 #endif
 600
 601 /*
 602  * Handlers for alternative sources of platform_data
 603  */
 604 #ifdef CONFIG_OF_GPIO
 605 /*
 606  * Translate OpenFirmware node properties into platform_data
 607  * WARNING: This is DEPRECATED and will be removed eventually!
 608  */
 609 static void
 610 pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
 611 {
 612         struct device_node *node;
 613         const __be32 *val;
 614         int size;
 615
 616         *gpio_base = -1;
 617
 618         node = client->dev.of_node;
 619         if (node == NULL)
 620                 return;
 621
 622         val = of_get_property(node, "linux,gpio-base", &size);
 623         WARN(val, "%s: device-tree property 'linux,gpio-base' is deprecated!", __func__);
 624         if (val) {
 625                 if (size != sizeof(*val))
 626                         dev_warn(&client->dev, "%s: wrong linux,gpio-base\n",
 627                                  node->full_name);
 628                 else
 629                         *gpio_base = be32_to_cpup(val);
 630         }
 631
 632         val = of_get_property(node, "polarity", NULL);
 633         WARN(val, "%s: device-tree property 'polarity' is deprecated!", __func__);
 634         if (val)
 635                 *invert = *val;
 636 }
 637 #else
 638 static void
 639 pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
 640 {
 641         *gpio_base = -1;
 642 }
 643 #endif
 644
 645 static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
 646 {
 647         int ret;
 648         u8 val[MAX_BANK];
 649
 650         ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output);
 651         if (ret)
 652                 goto out;
 653
 654         ret = pca953x_read_regs(chip, PCA953X_DIRECTION,
 655                                chip->reg_direction);
 656         if (ret)
 657                 goto out;
 658
 659         /* set platform specific polarity inversion */
 660         if (invert)
 661                 memset(val, 0xFF, NBANK(chip));
 662         else
 663                 memset(val, 0, NBANK(chip));
 664
 665         ret = pca953x_write_regs(chip, PCA953X_INVERT, val);
 666 out:
 667         return ret;
 668 }
 669
 670 static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
 671 {
 672         int ret;
 673         u8 val[MAX_BANK];
 674
 675         ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output);
 676         if (ret)
 677                 goto out;
 678         ret = pca953x_read_regs(chip, PCA957X_CFG, chip->reg_direction);
 679         if (ret)
 680                 goto out;
 681
 682         /* set platform specific polarity inversion */
 683         if (invert)
 684                 memset(val, 0xFF, NBANK(chip));
 685         else
 686                 memset(val, 0, NBANK(chip));
 687         pca953x_write_regs(chip, PCA957X_INVRT, val);
 688
 689         /* To enable register 6, 7 to controll pull up and pull down */
 690         memset(val, 0x02, NBANK(chip));
 691         pca953x_write_regs(chip, PCA957X_BKEN, val);
 692
 693         return 0;
 694 out:
 695         return ret;
 696 }
 697
 698 static int pca953x_probe(struct i2c_client *client,
 699                                    const struct i2c_device_id *id)
 700 {
 701         struct pca953x_platform_data *pdata;
 702         struct pca953x_chip *chip;
 703         int irq_base = 0;
 704         int ret;
 705         u32 invert = 0;
 706
 707         chip = devm_kzalloc(&client->dev,
 708                         sizeof(struct pca953x_chip), GFP_KERNEL);
 709         if (chip == NULL)
 710                 return -ENOMEM;
 711
 712         pdata = dev_get_platdata(&client->dev);
 713         if (pdata) {
 714                 irq_base = pdata->irq_base;
 715                 chip->gpio_start = pdata->gpio_base;
 716                 invert = pdata->invert;
 717                 chip->names = pdata->names;
 718         } else {
 719                 pca953x_get_alt_pdata(client, &chip->gpio_start, &invert);
 720 #ifdef CONFIG_OF_GPIO
 721                 /* If I2C node has no interrupts property, disable GPIO interrupts */
 722                 if (of_find_property(client->dev.of_node, "interrupts", NULL) == NULL)
 723                         irq_base = -1;
 724 #endif
 725         }
 726
 727         chip->client = client;
 728
 729         chip->chip_type = id->driver_data & (PCA953X_TYPE | PCA957X_TYPE);
 730
 731         mutex_init(&chip->i2c_lock);
 732
 733         /* initialize cached registers from their original values.
 734          * we can't share this chip with another i2c master.
 735          */
 736         pca953x_setup_gpio(chip, id->driver_data & PCA_GPIO_MASK);
 737
 738         if (chip->chip_type == PCA953X_TYPE)
 739                 ret = device_pca953x_init(chip, invert);
 740         else
 741                 ret = device_pca957x_init(chip, invert);
 742         if (ret)
 743                 return ret;
 744
 745         ret = gpiochip_add(&chip->gpio_chip);
 746         if (ret)
 747                 return ret;
 748
 749         ret = pca953x_irq_setup(chip, id, irq_base);
 750         if (ret)
 751                 return ret;
 752
 753         if (pdata && pdata->setup) {
 754                 ret = pdata->setup(client, chip->gpio_chip.base,
 755                                 chip->gpio_chip.ngpio, pdata->context);
 756                 if (ret < 0)
 757                         dev_warn(&client->dev, "setup failed, %d\n", ret);
 758         }
 759
 760         i2c_set_clientdata(client, chip);
 761         return 0;
 762 }
 763
 764 static int pca953x_remove(struct i2c_client *client)
 765 {
 766         struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
 767         struct pca953x_chip *chip = i2c_get_clientdata(client);
 768         int ret = 0;
 769
 770         if (pdata && pdata->teardown) {
 771                 ret = pdata->teardown(client, chip->gpio_chip.base,
 772                                 chip->gpio_chip.ngpio, pdata->context);
 773                 if (ret < 0) {
 774                         dev_err(&client->dev, "%s failed, %d\n",
 775                                         "teardown", ret);
 776                         return ret;
 777                 }
 778         }
 779
 780         ret = gpiochip_remove(&chip->gpio_chip);
 781         if (ret) {
 782                 dev_err(&client->dev, "%s failed, %d\n",
 783                                 "gpiochip_remove()", ret);
 784                 return ret;
 785         }
 786
 787         return 0;
 788 }
 789
 790 static const struct of_device_id pca953x_dt_ids[] = {
 791         { .compatible = "nxp,pca9505", },
 792         { .compatible = "nxp,pca9534", },
 793         { .compatible = "nxp,pca9535", },
 794         { .compatible = "nxp,pca9536", },
 795         { .compatible = "nxp,pca9537", },
 796         { .compatible = "nxp,pca9538", },
 797         { .compatible = "nxp,pca9539", },
 798         { .compatible = "nxp,pca9554", },
 799         { .compatible = "nxp,pca9555", },
 800         { .compatible = "nxp,pca9556", },
 801         { .compatible = "nxp,pca9557", },
 802         { .compatible = "nxp,pca9574", },
 803         { .compatible = "nxp,pca9575", },
 804         { .compatible = "nxp,pca9698", },
 805
 806         { .compatible = "maxim,max7310", },
 807         { .compatible = "maxim,max7312", },
 808         { .compatible = "maxim,max7313", },
 809         { .compatible = "maxim,max7315", },
 810
 811         { .compatible = "ti,pca6107", },
 812         { .compatible = "ti,tca6408", },
 813         { .compatible = "ti,tca6416", },
 814         { .compatible = "ti,tca6424", },
 815
 816         { .compatible = "exar,xra1202", },
 817         { }
 818 };
 819
 820 MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
 821
 822 static struct i2c_driver pca953x_driver = {
 823         .driver = {
 824                 .name   = "pca953x",
 825                 .of_match_table = pca953x_dt_ids,
 826         },
 827         .probe          = pca953x_probe,
 828         .remove         = pca953x_remove,
 829         .id_table       = pca953x_id,
 830 };
 831
 832 static int __init pca953x_init(void)
 833 {
 834         return i2c_add_driver(&pca953x_driver);
 835 }
 836 /* register after i2c postcore initcall and before
 837  * subsys initcalls that may rely on these GPIOs
 838  */
 839 subsys_initcall(pca953x_init);
 840
 841 static void __exit pca953x_exit(void)
 842 {
 843         i2c_del_driver(&pca953x_driver);
 844 }
 845 module_exit(pca953x_exit);
 846
 847 MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
 848 MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
 849 MODULE_LICENSE("GPL");