drivers/gpio/gpio-pca953x.c

   1 /*
   2  *  PCA953x 4/8/16 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/irq.h>
  19 #include <linux/i2c.h>
  20 #include <linux/i2c/pca953x.h>
  21 #include <linux/slab.h>
  22 #ifdef CONFIG_OF_GPIO
  23 #include <linux/of_platform.h>
  24 #endif
  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
  47 static const struct i2c_device_id pca953x_id[] = {
  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
  61         { "max7310", 8  | PCA953X_TYPE, },
  62         { "max7312", 16 | PCA953X_TYPE | PCA_INT, },
  63         { "max7313", 16 | PCA953X_TYPE | PCA_INT, },
  64         { "max7315", 8  | PCA953X_TYPE | PCA_INT, },
  65         { "pca6107", 8  | PCA953X_TYPE | PCA_INT, },
  66         { "tca6408", 8  | PCA953X_TYPE | PCA_INT, },
  67         { "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
  68         { "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
  69         { }
  70 };
  71 MODULE_DEVICE_TABLE(i2c, pca953x_id);
  72
  73 struct pca953x_chip {
  74         unsigned gpio_start;
  75         u32 reg_output;
  76         u32 reg_direction;
  77         struct mutex i2c_lock;
  78
  79 #ifdef CONFIG_GPIO_PCA953X_IRQ
  80         struct mutex irq_lock;
  81         u32 irq_mask;
  82         u32 irq_stat;
  83         u32 irq_trig_raise;
  84         u32 irq_trig_fall;
  85         int      irq_base;
  86 #endif
  87
  88         struct i2c_client *client;
  89         struct gpio_chip gpio_chip;
  90         const char *const *names;
  91         int     chip_type;
  92 };
  93
  94 static int pca953x_write_reg(struct pca953x_chip *chip, int reg, u32 val)
  95 {
  96         int ret = 0;
  97
  98         if (chip->gpio_chip.ngpio <= 8)
  99                 ret = i2c_smbus_write_byte_data(chip->client, reg, val);
 100         else if (chip->gpio_chip.ngpio == 24) {
 101                 cpu_to_le32s(&val);
 102                 ret = i2c_smbus_write_i2c_block_data(chip->client,
 103                                                 (reg << 2) | REG_ADDR_AI,
 104                                                 3,
 105                                                 (u8 *) &val);
 106         }
 107         else {
 108                 switch (chip->chip_type) {
 109                 case PCA953X_TYPE:
 110                         ret = i2c_smbus_write_word_data(chip->client,
 111                                                         reg << 1, val);
 112                         break;
 113                 case PCA957X_TYPE:
 114                         ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
 115                                                         val & 0xff);
 116                         if (ret < 0)
 117                                 break;
 118                         ret = i2c_smbus_write_byte_data(chip->client,
 119                                                         (reg << 1) + 1,
 120                                                         (val & 0xff00) >> 8);
 121                         break;
 122                 }
 123         }
 124
 125         if (ret < 0) {
 126                 dev_err(&chip->client->dev, "failed writing register\n");
 127                 return ret;
 128         }
 129
 130         return 0;
 131 }
 132
 133 static int pca953x_read_reg(struct pca953x_chip *chip, int reg, u32 *val)
 134 {
 135         int ret;
 136
 137         if (chip->gpio_chip.ngpio <= 8) {
 138                 ret = i2c_smbus_read_byte_data(chip->client, reg);
 139                 *val = ret;
 140         }
 141         else if (chip->gpio_chip.ngpio == 24) {
 142                 *val = 0;
 143                 ret = i2c_smbus_read_i2c_block_data(chip->client,
 144                                                 (reg << 2) | REG_ADDR_AI,
 145                                                 3,
 146                                                 (u8 *) val);
 147                 le32_to_cpus(val);
 148         } else {
 149                 ret = i2c_smbus_read_word_data(chip->client, reg << 1);
 150                 *val = ret;
 151         }
 152
 153         if (ret < 0) {
 154                 dev_err(&chip->client->dev, "failed reading register\n");
 155                 return ret;
 156         }
 157
 158         return 0;
 159 }
 160
 161 static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
 162 {
 163         struct pca953x_chip *chip;
 164         uint reg_val;
 165         int ret, offset = 0;
 166
 167         chip = container_of(gc, struct pca953x_chip, gpio_chip);
 168
 169         mutex_lock(&chip->i2c_lock);
 170         reg_val = chip->reg_direction | (1u << off);
 171
 172         switch (chip->chip_type) {
 173         case PCA953X_TYPE:
 174                 offset = PCA953X_DIRECTION;
 175                 break;
 176         case PCA957X_TYPE:
 177                 offset = PCA957X_CFG;
 178                 break;
 179         }
 180         ret = pca953x_write_reg(chip, offset, reg_val);
 181         if (ret)
 182                 goto exit;
 183
 184         chip->reg_direction = reg_val;
 185         ret = 0;
 186 exit:
 187         mutex_unlock(&chip->i2c_lock);
 188         return ret;
 189 }
 190
 191 static int pca953x_gpio_direction_output(struct gpio_chip *gc,
 192                 unsigned off, int val)
 193 {
 194         struct pca953x_chip *chip;
 195         uint reg_val;
 196         int ret, offset = 0;
 197
 198         chip = container_of(gc, struct pca953x_chip, gpio_chip);
 199
 200         mutex_lock(&chip->i2c_lock);
 201         /* set output level */
 202         if (val)
 203                 reg_val = chip->reg_output | (1u << off);
 204         else
 205                 reg_val = chip->reg_output & ~(1u << off);
 206
 207         switch (chip->chip_type) {
 208         case PCA953X_TYPE:
 209                 offset = PCA953X_OUTPUT;
 210                 break;
 211         case PCA957X_TYPE:
 212                 offset = PCA957X_OUT;
 213                 break;
 214         }
 215         ret = pca953x_write_reg(chip, offset, reg_val);
 216         if (ret)
 217                 goto exit;
 218
 219         chip->reg_output = reg_val;
 220
 221         /* then direction */
 222         reg_val = chip->reg_direction & ~(1u << off);
 223         switch (chip->chip_type) {
 224         case PCA953X_TYPE:
 225                 offset = PCA953X_DIRECTION;
 226                 break;
 227         case PCA957X_TYPE:
 228                 offset = PCA957X_CFG;
 229                 break;
 230         }
 231         ret = pca953x_write_reg(chip, offset, reg_val);
 232         if (ret)
 233                 goto exit;
 234
 235         chip->reg_direction = reg_val;
 236         ret = 0;
 237 exit:
 238         mutex_unlock(&chip->i2c_lock);
 239         return ret;
 240 }
 241
 242 static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
 243 {
 244         struct pca953x_chip *chip;
 245         u32 reg_val;
 246         int ret, offset = 0;
 247
 248         chip = container_of(gc, struct pca953x_chip, gpio_chip);
 249
 250         mutex_lock(&chip->i2c_lock);
 251         switch (chip->chip_type) {
 252         case PCA953X_TYPE:
 253                 offset = PCA953X_INPUT;
 254                 break;
 255         case PCA957X_TYPE:
 256                 offset = PCA957X_IN;
 257                 break;
 258         }
 259         ret = pca953x_read_reg(chip, offset, &reg_val);
 260         mutex_unlock(&chip->i2c_lock);
 261         if (ret < 0) {
 262                 /* NOTE:  diagnostic already emitted; that's all we should
 263                  * do unless gpio_*_value_cansleep() calls become different
 264                  * from their nonsleeping siblings (and report faults).
 265                  */
 266                 return 0;
 267         }
 268
 269         return (reg_val & (1u << off)) ? 1 : 0;
 270 }
 271
 272 static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
 273 {
 274         struct pca953x_chip *chip;
 275         u32 reg_val;
 276         int ret, offset = 0;
 277
 278         chip = container_of(gc, struct pca953x_chip, gpio_chip);
 279
 280         mutex_lock(&chip->i2c_lock);
 281         if (val)
 282                 reg_val = chip->reg_output | (1u << off);
 283         else
 284                 reg_val = chip->reg_output & ~(1u << off);
 285
 286         switch (chip->chip_type) {
 287         case PCA953X_TYPE:
 288                 offset = PCA953X_OUTPUT;
 289                 break;
 290         case PCA957X_TYPE:
 291                 offset = PCA957X_OUT;
 292                 break;
 293         }
 294         ret = pca953x_write_reg(chip, offset, reg_val);
 295         if (ret)
 296                 goto exit;
 297
 298         chip->reg_output = reg_val;
 299 exit:
 300         mutex_unlock(&chip->i2c_lock);
 301 }
 302
 303 static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
 304 {
 305         struct gpio_chip *gc;
 306
 307         gc = &chip->gpio_chip;
 308
 309         gc->direction_input  = pca953x_gpio_direction_input;
 310         gc->direction_output = pca953x_gpio_direction_output;
 311         gc->get = pca953x_gpio_get_value;
 312         gc->set = pca953x_gpio_set_value;
 313         gc->can_sleep = 1;
 314
 315         gc->base = chip->gpio_start;
 316         gc->ngpio = gpios;
 317         gc->label = chip->client->name;
 318         gc->dev = &chip->client->dev;
 319         gc->owner = THIS_MODULE;
 320         gc->names = chip->names;
 321 }
 322
 323 #ifdef CONFIG_GPIO_PCA953X_IRQ
 324 static int pca953x_gpio_to_irq(struct gpio_chip *gc, unsigned off)
 325 {
 326         struct pca953x_chip *chip;
 327
 328         chip = container_of(gc, struct pca953x_chip, gpio_chip);
 329         return chip->irq_base + off;
 330 }
 331
 332 static void pca953x_irq_mask(struct irq_data *d)
 333 {
 334         struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
 335
 336         chip->irq_mask &= ~(1 << (d->irq - chip->irq_base));
 337 }
 338
 339 static void pca953x_irq_unmask(struct irq_data *d)
 340 {
 341         struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
 342
 343         chip->irq_mask |= 1 << (d->irq - chip->irq_base);
 344 }
 345
 346 static void pca953x_irq_bus_lock(struct irq_data *d)
 347 {
 348         struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
 349
 350         mutex_lock(&chip->irq_lock);
 351 }
 352
 353 static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
 354 {
 355         struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
 356         u32 new_irqs;
 357         u32 level;
 358
 359         /* Look for any newly setup interrupt */
 360         new_irqs = chip->irq_trig_fall | chip->irq_trig_raise;
 361         new_irqs &= ~chip->reg_direction;
 362
 363         while (new_irqs) {
 364                 level = __ffs(new_irqs);
 365                 pca953x_gpio_direction_input(&chip->gpio_chip, level);
 366                 new_irqs &= ~(1 << level);
 367         }
 368
 369         mutex_unlock(&chip->irq_lock);
 370 }
 371
 372 static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
 373 {
 374         struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
 375         u32 level = d->irq - chip->irq_base;
 376         u32 mask = 1 << level;
 377
 378         if (!(type & IRQ_TYPE_EDGE_BOTH)) {
 379                 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
 380                         d->irq, type);
 381                 return -EINVAL;
 382         }
 383
 384         if (type & IRQ_TYPE_EDGE_FALLING)
 385                 chip->irq_trig_fall |= mask;
 386         else
 387                 chip->irq_trig_fall &= ~mask;
 388
 389         if (type & IRQ_TYPE_EDGE_RISING)
 390                 chip->irq_trig_raise |= mask;
 391         else
 392                 chip->irq_trig_raise &= ~mask;
 393
 394         return 0;
 395 }
 396
 397 static struct irq_chip pca953x_irq_chip = {
 398         .name                   = "pca953x",
 399         .irq_mask               = pca953x_irq_mask,
 400         .irq_unmask             = pca953x_irq_unmask,
 401         .irq_bus_lock           = pca953x_irq_bus_lock,
 402         .irq_bus_sync_unlock    = pca953x_irq_bus_sync_unlock,
 403         .irq_set_type           = pca953x_irq_set_type,
 404 };
 405
 406 static u32 pca953x_irq_pending(struct pca953x_chip *chip)
 407 {
 408         u32 cur_stat;
 409         u32 old_stat;
 410         u32 pending;
 411         u32 trigger;
 412         int ret, offset = 0;
 413
 414         switch (chip->chip_type) {
 415         case PCA953X_TYPE:
 416                 offset = PCA953X_INPUT;
 417                 break;
 418         case PCA957X_TYPE:
 419                 offset = PCA957X_IN;
 420                 break;
 421         }
 422         ret = pca953x_read_reg(chip, offset, &cur_stat);
 423         if (ret)
 424                 return 0;
 425
 426         /* Remove output pins from the equation */
 427         cur_stat &= chip->reg_direction;
 428
 429         old_stat = chip->irq_stat;
 430         trigger = (cur_stat ^ old_stat) & chip->irq_mask;
 431
 432         if (!trigger)
 433                 return 0;
 434
 435         chip->irq_stat = cur_stat;
 436
 437         pending = (old_stat & chip->irq_trig_fall) |
 438                   (cur_stat & chip->irq_trig_raise);
 439         pending &= trigger;
 440
 441         return pending;
 442 }
 443
 444 static irqreturn_t pca953x_irq_handler(int irq, void *devid)
 445 {
 446         struct pca953x_chip *chip = devid;
 447         u32 pending;
 448         u32 level;
 449
 450         pending = pca953x_irq_pending(chip);
 451
 452         if (!pending)
 453                 return IRQ_HANDLED;
 454
 455         do {
 456                 level = __ffs(pending);
 457                 handle_nested_irq(level + chip->irq_base);
 458
 459                 pending &= ~(1 << level);
 460         } while (pending);
 461
 462         return IRQ_HANDLED;
 463 }
 464
 465 static int pca953x_irq_setup(struct pca953x_chip *chip,
 466                              const struct i2c_device_id *id,
 467                              int irq_base)
 468 {
 469         struct i2c_client *client = chip->client;
 470         int ret, offset = 0;
 471         u32 temporary;
 472
 473         if (irq_base != -1
 474                         && (id->driver_data & PCA_INT)) {
 475                 int lvl;
 476
 477                 switch (chip->chip_type) {
 478                 case PCA953X_TYPE:
 479                         offset = PCA953X_INPUT;
 480                         break;
 481                 case PCA957X_TYPE:
 482                         offset = PCA957X_IN;
 483                         break;
 484                 }
 485                 ret = pca953x_read_reg(chip, offset, &temporary);
 486                 chip->irq_stat = temporary;
 487                 if (ret)
 488                         goto out_failed;
 489
 490                 /*
 491                  * There is no way to know which GPIO line generated the
 492                  * interrupt.  We have to rely on the previous read for
 493                  * this purpose.
 494                  */
 495                 chip->irq_stat &= chip->reg_direction;
 496                 mutex_init(&chip->irq_lock);
 497
 498                 chip->irq_base = irq_alloc_descs(-1, irq_base, chip->gpio_chip.ngpio, -1);
 499                 if (chip->irq_base < 0)
 500                         goto out_failed;
 501
 502                 for (lvl = 0; lvl < chip->gpio_chip.ngpio; lvl++) {
 503                         int irq = lvl + chip->irq_base;
 504
 505                         irq_clear_status_flags(irq, IRQ_NOREQUEST);
 506                         irq_set_chip_data(irq, chip);
 507                         irq_set_chip(irq, &pca953x_irq_chip);
 508                         irq_set_nested_thread(irq, true);
 509 #ifdef CONFIG_ARM
 510                         set_irq_flags(irq, IRQF_VALID);
 511 #else
 512                         irq_set_noprobe(irq);
 513 #endif
 514                 }
 515
 516                 ret = request_threaded_irq(client->irq,
 517                                            NULL,
 518                                            pca953x_irq_handler,
 519                                            IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 520                                            dev_name(&client->dev), chip);
 521                 if (ret) {
 522                         dev_err(&client->dev, "failed to request irq %d\n",
 523                                 client->irq);
 524                         goto out_failed;
 525                 }
 526
 527                 chip->gpio_chip.to_irq = pca953x_gpio_to_irq;
 528         }
 529
 530         return 0;
 531
 532 out_failed:
 533         chip->irq_base = -1;
 534         return ret;
 535 }
 536
 537 static void pca953x_irq_teardown(struct pca953x_chip *chip)
 538 {
 539         if (chip->irq_base != -1) {
 540                 irq_free_descs(chip->irq_base, chip->gpio_chip.ngpio);
 541                 free_irq(chip->client->irq, chip);
 542         }
 543 }
 544 #else /* CONFIG_GPIO_PCA953X_IRQ */
 545 static int pca953x_irq_setup(struct pca953x_chip *chip,
 546                              const struct i2c_device_id *id,
 547                              int irq_base)
 548 {
 549         struct i2c_client *client = chip->client;
 550
 551         if (irq_base != -1 && (id->driver_data & PCA_INT))
 552                 dev_warn(&client->dev, "interrupt support not compiled in\n");
 553
 554         return 0;
 555 }
 556
 557 static void pca953x_irq_teardown(struct pca953x_chip *chip)
 558 {
 559 }
 560 #endif
 561
 562 /*
 563  * Handlers for alternative sources of platform_data
 564  */
 565 #ifdef CONFIG_OF_GPIO
 566 /*
 567  * Translate OpenFirmware node properties into platform_data
 568  * WARNING: This is DEPRECATED and will be removed eventually!
 569  */
 570 static void
 571 pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
 572 {
 573         struct device_node *node;
 574         const __be32 *val;
 575         int size;
 576
 577         node = client->dev.of_node;
 578         if (node == NULL)
 579                 return;
 580
 581         *gpio_base = -1;
 582         val = of_get_property(node, "linux,gpio-base", &size);
 583         WARN(val, "%s: device-tree property 'linux,gpio-base' is deprecated!", __func__);
 584         if (val) {
 585                 if (size != sizeof(*val))
 586                         dev_warn(&client->dev, "%s: wrong linux,gpio-base\n",
 587                                  node->full_name);
 588                 else
 589                         *gpio_base = be32_to_cpup(val);
 590         }
 591
 592         val = of_get_property(node, "polarity", NULL);
 593         WARN(val, "%s: device-tree property 'polarity' is deprecated!", __func__);
 594         if (val)
 595                 *invert = *val;
 596 }
 597 #else
 598 static void
 599 pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
 600 {
 601         *gpio_base = -1;
 602 }
 603 #endif
 604
 605 static int __devinit device_pca953x_init(struct pca953x_chip *chip, u32 invert)
 606 {
 607         int ret;
 608
 609         ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
 610         if (ret)
 611                 goto out;
 612
 613         ret = pca953x_read_reg(chip, PCA953X_DIRECTION,
 614                                &chip->reg_direction);
 615         if (ret)
 616                 goto out;
 617
 618         /* set platform specific polarity inversion */
 619         ret = pca953x_write_reg(chip, PCA953X_INVERT, invert);
 620 out:
 621         return ret;
 622 }
 623
 624 static int __devinit device_pca957x_init(struct pca953x_chip *chip, u32 invert)
 625 {
 626         int ret;
 627         u32 val = 0;
 628
 629         /* Let every port in proper state, that could save power */
 630         pca953x_write_reg(chip, PCA957X_PUPD, 0x0);
 631         pca953x_write_reg(chip, PCA957X_CFG, 0xffff);
 632         pca953x_write_reg(chip, PCA957X_OUT, 0x0);
 633
 634         ret = pca953x_read_reg(chip, PCA957X_IN, &val);
 635         if (ret)
 636                 goto out;
 637         ret = pca953x_read_reg(chip, PCA957X_OUT, &chip->reg_output);
 638         if (ret)
 639                 goto out;
 640         ret = pca953x_read_reg(chip, PCA957X_CFG, &chip->reg_direction);
 641         if (ret)
 642                 goto out;
 643
 644         /* set platform specific polarity inversion */
 645         pca953x_write_reg(chip, PCA957X_INVRT, invert);
 646
 647         /* To enable register 6, 7 to controll pull up and pull down */
 648         pca953x_write_reg(chip, PCA957X_BKEN, 0x202);
 649
 650         return 0;
 651 out:
 652         return ret;
 653 }
 654
 655 static int __devinit pca953x_probe(struct i2c_client *client,
 656                                    const struct i2c_device_id *id)
 657 {
 658         struct pca953x_platform_data *pdata;
 659         struct pca953x_chip *chip;
 660         int irq_base = 0;
 661         int ret;
 662         u32 invert = 0;
 663
 664         chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
 665         if (chip == NULL)
 666                 return -ENOMEM;
 667
 668         pdata = client->dev.platform_data;
 669         if (pdata) {
 670                 irq_base = pdata->irq_base;
 671                 chip->gpio_start = pdata->gpio_base;
 672                 invert = pdata->invert;
 673                 chip->names = pdata->names;
 674         } else {
 675                 pca953x_get_alt_pdata(client, &chip->gpio_start, &invert);
 676 #ifdef CONFIG_OF_GPIO
 677                 /* If I2C node has no interrupts property, disable GPIO interrupts */
 678                 if (of_find_property(client->dev.of_node, "interrupts", NULL) == NULL)
 679                         irq_base = -1;
 680 #endif
 681         }
 682
 683         chip->client = client;
 684
 685         chip->chip_type = id->driver_data & (PCA953X_TYPE | PCA957X_TYPE);
 686
 687         mutex_init(&chip->i2c_lock);
 688
 689         /* initialize cached registers from their original values.
 690          * we can't share this chip with another i2c master.
 691          */
 692         pca953x_setup_gpio(chip, id->driver_data & PCA_GPIO_MASK);
 693
 694         if (chip->chip_type == PCA953X_TYPE)
 695                 ret = device_pca953x_init(chip, invert);
 696         else
 697                 ret = device_pca957x_init(chip, invert);
 698         if (ret)
 699                 goto out_failed;
 700
 701         ret = pca953x_irq_setup(chip, id, irq_base);
 702         if (ret)
 703                 goto out_failed;
 704
 705         ret = gpiochip_add(&chip->gpio_chip);
 706         if (ret)
 707                 goto out_failed_irq;
 708
 709         if (pdata && pdata->setup) {
 710                 ret = pdata->setup(client, chip->gpio_chip.base,
 711                                 chip->gpio_chip.ngpio, pdata->context);
 712                 if (ret < 0)
 713                         dev_warn(&client->dev, "setup failed, %d\n", ret);
 714         }
 715
 716         i2c_set_clientdata(client, chip);
 717         return 0;
 718
 719 out_failed_irq:
 720         pca953x_irq_teardown(chip);
 721 out_failed:
 722         kfree(chip);
 723         return ret;
 724 }
 725
 726 static int pca953x_remove(struct i2c_client *client)
 727 {
 728         struct pca953x_platform_data *pdata = client->dev.platform_data;
 729         struct pca953x_chip *chip = i2c_get_clientdata(client);
 730         int ret = 0;
 731
 732         if (pdata && pdata->teardown) {
 733                 ret = pdata->teardown(client, chip->gpio_chip.base,
 734                                 chip->gpio_chip.ngpio, pdata->context);
 735                 if (ret < 0) {
 736                         dev_err(&client->dev, "%s failed, %d\n",
 737                                         "teardown", ret);
 738                         return ret;
 739                 }
 740         }
 741
 742         ret = gpiochip_remove(&chip->gpio_chip);
 743         if (ret) {
 744                 dev_err(&client->dev, "%s failed, %d\n",
 745                                 "gpiochip_remove()", ret);
 746                 return ret;
 747         }
 748
 749         pca953x_irq_teardown(chip);
 750         kfree(chip);
 751         return 0;
 752 }
 753
 754 static struct i2c_driver pca953x_driver = {
 755         .driver = {
 756                 .name   = "pca953x",
 757         },
 758         .probe          = pca953x_probe,
 759         .remove         = pca953x_remove,
 760         .id_table       = pca953x_id,
 761 };
 762
 763 static int __init pca953x_init(void)
 764 {
 765         return i2c_add_driver(&pca953x_driver);
 766 }
 767 /* register after i2c postcore initcall and before
 768  * subsys initcalls that may rely on these GPIOs
 769  */
 770 subsys_initcall(pca953x_init);
 771
 772 static void __exit pca953x_exit(void)
 773 {
 774         i2c_del_driver(&pca953x_driver);
 775 }
 776 module_exit(pca953x_exit);
 777
 778 MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
 779 MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
 780 MODULE_LICENSE("GPL");