drivers/gpio/gpio-pca953x.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  PCA953x 4/8/16/24/40 bit I/O ports
   4  *
   5  *  Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
   6  *  Copyright (C) 2007 Marvell International Ltd.
   7  *
   8  *  Derived from drivers/i2c/chips/pca9539.c
   9  */
  10
  11 #include <linux/acpi.h>
  12 #include <linux/bitmap.h>
  13 #include <linux/gpio/driver.h>
  14 #include <linux/gpio/consumer.h>
  15 #include <linux/i2c.h>
  16 #include <linux/init.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/module.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/platform_data/pca953x.h>
  21 #include <linux/regmap.h>
  22 #include <linux/regulator/consumer.h>
  23 #include <linux/slab.h>
  24
  25 #include <asm/unaligned.h>
  26
  27 #define PCA953X_INPUT           0x00
  28 #define PCA953X_OUTPUT          0x01
  29 #define PCA953X_INVERT          0x02
  30 #define PCA953X_DIRECTION       0x03
  31
  32 #define REG_ADDR_MASK           GENMASK(5, 0)
  33 #define REG_ADDR_EXT            BIT(6)
  34 #define REG_ADDR_AI             BIT(7)
  35
  36 #define PCA957X_IN              0x00
  37 #define PCA957X_INVRT           0x01
  38 #define PCA957X_BKEN            0x02
  39 #define PCA957X_PUPD            0x03
  40 #define PCA957X_CFG             0x04
  41 #define PCA957X_OUT             0x05
  42 #define PCA957X_MSK             0x06
  43 #define PCA957X_INTS            0x07
  44
  45 #define PCAL953X_OUT_STRENGTH   0x20
  46 #define PCAL953X_IN_LATCH       0x22
  47 #define PCAL953X_PULL_EN        0x23
  48 #define PCAL953X_PULL_SEL       0x24
  49 #define PCAL953X_INT_MASK       0x25
  50 #define PCAL953X_INT_STAT       0x26
  51 #define PCAL953X_OUT_CONF       0x27
  52
  53 #define PCAL6524_INT_EDGE       0x28
  54 #define PCAL6524_INT_CLR        0x2a
  55 #define PCAL6524_IN_STATUS      0x2b
  56 #define PCAL6524_OUT_INDCONF    0x2c
  57 #define PCAL6524_DEBOUNCE       0x2d
  58
  59 #define PCA_GPIO_MASK           GENMASK(7, 0)
  60
  61 #define PCAL_GPIO_MASK          GENMASK(4, 0)
  62 #define PCAL_PINCTRL_MASK       GENMASK(6, 5)
  63
  64 #define PCA_INT                 BIT(8)
  65 #define PCA_PCAL                BIT(9)
  66 #define PCA_LATCH_INT           (PCA_PCAL | PCA_INT)
  67 #define PCA953X_TYPE            BIT(12)
  68 #define PCA957X_TYPE            BIT(13)
  69 #define PCA_TYPE_MASK           GENMASK(15, 12)
  70
  71 #define PCA_CHIP_TYPE(x)        ((x) & PCA_TYPE_MASK)
  72
  73 static const struct i2c_device_id pca953x_id[] = {
  74         { "pca6416", 16 | PCA953X_TYPE | PCA_INT, },
  75         { "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
  76         { "pca9534", 8  | PCA953X_TYPE | PCA_INT, },
  77         { "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
  78         { "pca9536", 4  | PCA953X_TYPE, },
  79         { "pca9537", 4  | PCA953X_TYPE | PCA_INT, },
  80         { "pca9538", 8  | PCA953X_TYPE | PCA_INT, },
  81         { "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
  82         { "pca9554", 8  | PCA953X_TYPE | PCA_INT, },
  83         { "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
  84         { "pca9556", 8  | PCA953X_TYPE, },
  85         { "pca9557", 8  | PCA953X_TYPE, },
  86         { "pca9574", 8  | PCA957X_TYPE | PCA_INT, },
  87         { "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
  88         { "pca9698", 40 | PCA953X_TYPE, },
  89
  90         { "pcal6416", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
  91         { "pcal6524", 24 | PCA953X_TYPE | PCA_LATCH_INT, },
  92         { "pcal9555a", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
  93
  94         { "max7310", 8  | PCA953X_TYPE, },
  95         { "max7312", 16 | PCA953X_TYPE | PCA_INT, },
  96         { "max7313", 16 | PCA953X_TYPE | PCA_INT, },
  97         { "max7315", 8  | PCA953X_TYPE | PCA_INT, },
  98         { "max7318", 16 | PCA953X_TYPE | PCA_INT, },
  99         { "pca6107", 8  | PCA953X_TYPE | PCA_INT, },
 100         { "tca6408", 8  | PCA953X_TYPE | PCA_INT, },
 101         { "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
 102         { "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
 103         { "tca9539", 16 | PCA953X_TYPE | PCA_INT, },
 104         { "tca9554", 8  | PCA953X_TYPE | PCA_INT, },
 105         { "xra1202", 8  | PCA953X_TYPE },
 106         { }
 107 };
 108 MODULE_DEVICE_TABLE(i2c, pca953x_id);
 109
 110 static const struct acpi_device_id pca953x_acpi_ids[] = {
 111         { "INT3491", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
 112         { }
 113 };
 114 MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);
 115
 116 #define MAX_BANK 5
 117 #define BANK_SZ 8
 118 #define MAX_LINE        (MAX_BANK * BANK_SZ)
 119
 120 #define NBANK(chip) DIV_ROUND_UP(chip->gpio_chip.ngpio, BANK_SZ)
 121
 122 struct pca953x_reg_config {
 123         int direction;
 124         int output;
 125         int input;
 126         int invert;
 127 };
 128
 129 static const struct pca953x_reg_config pca953x_regs = {
 130         .direction = PCA953X_DIRECTION,
 131         .output = PCA953X_OUTPUT,
 132         .input = PCA953X_INPUT,
 133         .invert = PCA953X_INVERT,
 134 };
 135
 136 static const struct pca953x_reg_config pca957x_regs = {
 137         .direction = PCA957X_CFG,
 138         .output = PCA957X_OUT,
 139         .input = PCA957X_IN,
 140         .invert = PCA957X_INVRT,
 141 };
 142
 143 struct pca953x_chip {
 144         unsigned gpio_start;
 145         struct mutex i2c_lock;
 146         struct regmap *regmap;
 147
 148 #ifdef CONFIG_GPIO_PCA953X_IRQ
 149         struct mutex irq_lock;
 150         DECLARE_BITMAP(irq_mask, MAX_LINE);
 151         DECLARE_BITMAP(irq_stat, MAX_LINE);
 152         DECLARE_BITMAP(irq_trig_raise, MAX_LINE);
 153         DECLARE_BITMAP(irq_trig_fall, MAX_LINE);
 154         struct irq_chip irq_chip;
 155 #endif
 156         atomic_t wakeup_path;
 157
 158         struct i2c_client *client;
 159         struct gpio_chip gpio_chip;
 160         const char *const *names;
 161         unsigned long driver_data;
 162         struct regulator *regulator;
 163
 164         const struct pca953x_reg_config *regs;
 165 };
 166
 167 static int pca953x_bank_shift(struct pca953x_chip *chip)
 168 {
 169         return fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 170 }
 171
 172 #define PCA953x_BANK_INPUT      BIT(0)
 173 #define PCA953x_BANK_OUTPUT     BIT(1)
 174 #define PCA953x_BANK_POLARITY   BIT(2)
 175 #define PCA953x_BANK_CONFIG     BIT(3)
 176
 177 #define PCA957x_BANK_INPUT      BIT(0)
 178 #define PCA957x_BANK_POLARITY   BIT(1)
 179 #define PCA957x_BANK_BUSHOLD    BIT(2)
 180 #define PCA957x_BANK_CONFIG     BIT(4)
 181 #define PCA957x_BANK_OUTPUT     BIT(5)
 182
 183 #define PCAL9xxx_BANK_IN_LATCH  BIT(8 + 2)
 184 #define PCAL9xxx_BANK_PULL_EN   BIT(8 + 3)
 185 #define PCAL9xxx_BANK_PULL_SEL  BIT(8 + 4)
 186 #define PCAL9xxx_BANK_IRQ_MASK  BIT(8 + 5)
 187 #define PCAL9xxx_BANK_IRQ_STAT  BIT(8 + 6)
 188
 189 /*
 190  * We care about the following registers:
 191  * - Standard set, below 0x40, each port can be replicated up to 8 times
 192  *   - PCA953x standard
 193  *     Input port                       0x00 + 0 * bank_size    R
 194  *     Output port                      0x00 + 1 * bank_size    RW
 195  *     Polarity Inversion port          0x00 + 2 * bank_size    RW
 196  *     Configuration port               0x00 + 3 * bank_size    RW
 197  *   - PCA957x with mixed up registers
 198  *     Input port                       0x00 + 0 * bank_size    R
 199  *     Polarity Inversion port          0x00 + 1 * bank_size    RW
 200  *     Bus hold port                    0x00 + 2 * bank_size    RW
 201  *     Configuration port               0x00 + 4 * bank_size    RW
 202  *     Output port                      0x00 + 5 * bank_size    RW
 203  *
 204  * - Extended set, above 0x40, often chip specific.
 205  *   - PCAL6524/PCAL9555A with custom PCAL IRQ handling:
 206  *     Input latch register             0x40 + 2 * bank_size    RW
 207  *     Pull-up/pull-down enable reg     0x40 + 3 * bank_size    RW
 208  *     Pull-up/pull-down select reg     0x40 + 4 * bank_size    RW
 209  *     Interrupt mask register          0x40 + 5 * bank_size    RW
 210  *     Interrupt status register        0x40 + 6 * bank_size    R
 211  *
 212  * - Registers with bit 0x80 set, the AI bit
 213  *   The bit is cleared and the registers fall into one of the
 214  *   categories above.
 215  */
 216
 217 static bool pca953x_check_register(struct pca953x_chip *chip, unsigned int reg,
 218                                    u32 checkbank)
 219 {
 220         int bank_shift = pca953x_bank_shift(chip);
 221         int bank = (reg & REG_ADDR_MASK) >> bank_shift;
 222         int offset = reg & (BIT(bank_shift) - 1);
 223
 224         /* Special PCAL extended register check. */
 225         if (reg & REG_ADDR_EXT) {
 226                 if (!(chip->driver_data & PCA_PCAL))
 227                         return false;
 228                 bank += 8;
 229         }
 230
 231         /* Register is not in the matching bank. */
 232         if (!(BIT(bank) & checkbank))
 233                 return false;
 234
 235         /* Register is not within allowed range of bank. */
 236         if (offset >= NBANK(chip))
 237                 return false;
 238
 239         return true;
 240 }
 241
 242 static bool pca953x_readable_register(struct device *dev, unsigned int reg)
 243 {
 244         struct pca953x_chip *chip = dev_get_drvdata(dev);
 245         u32 bank;
 246
 247         if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE) {
 248                 bank = PCA953x_BANK_INPUT | PCA953x_BANK_OUTPUT |
 249                        PCA953x_BANK_POLARITY | PCA953x_BANK_CONFIG;
 250         } else {
 251                 bank = PCA957x_BANK_INPUT | PCA957x_BANK_OUTPUT |
 252                        PCA957x_BANK_POLARITY | PCA957x_BANK_CONFIG |
 253                        PCA957x_BANK_BUSHOLD;
 254         }
 255
 256         if (chip->driver_data & PCA_PCAL) {
 257                 bank |= PCAL9xxx_BANK_IN_LATCH | PCAL9xxx_BANK_PULL_EN |
 258                         PCAL9xxx_BANK_PULL_SEL | PCAL9xxx_BANK_IRQ_MASK |
 259                         PCAL9xxx_BANK_IRQ_STAT;
 260         }
 261
 262         return pca953x_check_register(chip, reg, bank);
 263 }
 264
 265 static bool pca953x_writeable_register(struct device *dev, unsigned int reg)
 266 {
 267         struct pca953x_chip *chip = dev_get_drvdata(dev);
 268         u32 bank;
 269
 270         if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE) {
 271                 bank = PCA953x_BANK_OUTPUT | PCA953x_BANK_POLARITY |
 272                         PCA953x_BANK_CONFIG;
 273         } else {
 274                 bank = PCA957x_BANK_OUTPUT | PCA957x_BANK_POLARITY |
 275                         PCA957x_BANK_CONFIG | PCA957x_BANK_BUSHOLD;
 276         }
 277
 278         if (chip->driver_data & PCA_PCAL)
 279                 bank |= PCAL9xxx_BANK_IN_LATCH | PCAL9xxx_BANK_PULL_EN |
 280                         PCAL9xxx_BANK_PULL_SEL | PCAL9xxx_BANK_IRQ_MASK;
 281
 282         return pca953x_check_register(chip, reg, bank);
 283 }
 284
 285 static bool pca953x_volatile_register(struct device *dev, unsigned int reg)
 286 {
 287         struct pca953x_chip *chip = dev_get_drvdata(dev);
 288         u32 bank;
 289
 290         if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE)
 291                 bank = PCA953x_BANK_INPUT;
 292         else
 293                 bank = PCA957x_BANK_INPUT;
 294
 295         if (chip->driver_data & PCA_PCAL)
 296                 bank |= PCAL9xxx_BANK_IRQ_STAT;
 297
 298         return pca953x_check_register(chip, reg, bank);
 299 }
 300
 301 static const struct regmap_config pca953x_i2c_regmap = {
 302         .reg_bits = 8,
 303         .val_bits = 8,
 304
 305         .readable_reg = pca953x_readable_register,
 306         .writeable_reg = pca953x_writeable_register,
 307         .volatile_reg = pca953x_volatile_register,
 308
 309         .cache_type = REGCACHE_RBTREE,
 310         /* REVISIT: should be 0x7f but some 24 bit chips use REG_ADDR_AI */
 311         .max_register = 0xff,
 312 };
 313
 314 static u8 pca953x_recalc_addr(struct pca953x_chip *chip, int reg, int off,
 315                               bool write, bool addrinc)
 316 {
 317         int bank_shift = pca953x_bank_shift(chip);
 318         int addr = (reg & PCAL_GPIO_MASK) << bank_shift;
 319         int pinctrl = (reg & PCAL_PINCTRL_MASK) << 1;
 320         u8 regaddr = pinctrl | addr | (off / BANK_SZ);
 321
 322         /* Single byte read doesn't need AI bit set. */
 323         if (!addrinc)
 324                 return regaddr;
 325
 326         /* Chips with 24 and more GPIOs always support Auto Increment */
 327         if (write && NBANK(chip) > 2)
 328                 regaddr |= REG_ADDR_AI;
 329
 330         /* PCA9575 needs address-increment on multi-byte writes */
 331         if (PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE)
 332                 regaddr |= REG_ADDR_AI;
 333
 334         return regaddr;
 335 }
 336
 337 static int pca953x_write_regs(struct pca953x_chip *chip, int reg, unsigned long *val)
 338 {
 339         u8 regaddr = pca953x_recalc_addr(chip, reg, 0, true, true);
 340         u8 value[MAX_BANK];
 341         int i, ret;
 342
 343         for (i = 0; i < NBANK(chip); i++)
 344                 value[i] = bitmap_get_value8(val, i * BANK_SZ);
 345
 346         ret = regmap_bulk_write(chip->regmap, regaddr, value, NBANK(chip));
 347         if (ret < 0) {
 348                 dev_err(&chip->client->dev, "failed writing register\n");
 349                 return ret;
 350         }
 351
 352         return 0;
 353 }
 354
 355 static int pca953x_read_regs(struct pca953x_chip *chip, int reg, unsigned long *val)
 356 {
 357         u8 regaddr = pca953x_recalc_addr(chip, reg, 0, false, true);
 358         u8 value[MAX_BANK];
 359         int i, ret;
 360
 361         ret = regmap_bulk_read(chip->regmap, regaddr, value, NBANK(chip));
 362         if (ret < 0) {
 363                 dev_err(&chip->client->dev, "failed reading register\n");
 364                 return ret;
 365         }
 366
 367         for (i = 0; i < NBANK(chip); i++)
 368                 bitmap_set_value8(val, value[i], i * BANK_SZ);
 369
 370         return 0;
 371 }
 372
 373 static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
 374 {
 375         struct pca953x_chip *chip = gpiochip_get_data(gc);
 376         u8 dirreg = pca953x_recalc_addr(chip, chip->regs->direction, off,
 377                                         true, false);
 378         u8 bit = BIT(off % BANK_SZ);
 379         int ret;
 380
 381         mutex_lock(&chip->i2c_lock);
 382         ret = regmap_write_bits(chip->regmap, dirreg, bit, bit);
 383         mutex_unlock(&chip->i2c_lock);
 384         return ret;
 385 }
 386
 387 static int pca953x_gpio_direction_output(struct gpio_chip *gc,
 388                 unsigned off, int val)
 389 {
 390         struct pca953x_chip *chip = gpiochip_get_data(gc);
 391         u8 dirreg = pca953x_recalc_addr(chip, chip->regs->direction, off,
 392                                         true, false);
 393         u8 outreg = pca953x_recalc_addr(chip, chip->regs->output, off,
 394                                         true, false);
 395         u8 bit = BIT(off % BANK_SZ);
 396         int ret;
 397
 398         mutex_lock(&chip->i2c_lock);
 399         /* set output level */
 400         ret = regmap_write_bits(chip->regmap, outreg, bit, val ? bit : 0);
 401         if (ret)
 402                 goto exit;
 403
 404         /* then direction */
 405         ret = regmap_write_bits(chip->regmap, dirreg, bit, 0);
 406 exit:
 407         mutex_unlock(&chip->i2c_lock);
 408         return ret;
 409 }
 410
 411 static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
 412 {
 413         struct pca953x_chip *chip = gpiochip_get_data(gc);
 414         u8 inreg = pca953x_recalc_addr(chip, chip->regs->input, off,
 415                                        true, false);
 416         u8 bit = BIT(off % BANK_SZ);
 417         u32 reg_val;
 418         int ret;
 419
 420         mutex_lock(&chip->i2c_lock);
 421         ret = regmap_read(chip->regmap, inreg, &reg_val);
 422         mutex_unlock(&chip->i2c_lock);
 423         if (ret < 0) {
 424                 /*
 425                  * NOTE:
 426                  * diagnostic already emitted; that's all we should
 427                  * do unless gpio_*_value_cansleep() calls become different
 428                  * from their nonsleeping siblings (and report faults).
 429                  */
 430                 return 0;
 431         }
 432
 433         return !!(reg_val & bit);
 434 }
 435
 436 static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
 437 {
 438         struct pca953x_chip *chip = gpiochip_get_data(gc);
 439         u8 outreg = pca953x_recalc_addr(chip, chip->regs->output, off,
 440                                         true, false);
 441         u8 bit = BIT(off % BANK_SZ);
 442
 443         mutex_lock(&chip->i2c_lock);
 444         regmap_write_bits(chip->regmap, outreg, bit, val ? bit : 0);
 445         mutex_unlock(&chip->i2c_lock);
 446 }
 447
 448 static int pca953x_gpio_get_direction(struct gpio_chip *gc, unsigned off)
 449 {
 450         struct pca953x_chip *chip = gpiochip_get_data(gc);
 451         u8 dirreg = pca953x_recalc_addr(chip, chip->regs->direction, off,
 452                                         true, false);
 453         u8 bit = BIT(off % BANK_SZ);
 454         u32 reg_val;
 455         int ret;
 456
 457         mutex_lock(&chip->i2c_lock);
 458         ret = regmap_read(chip->regmap, dirreg, &reg_val);
 459         mutex_unlock(&chip->i2c_lock);
 460         if (ret < 0)
 461                 return ret;
 462
 463         if (reg_val & bit)
 464                 return GPIO_LINE_DIRECTION_IN;
 465
 466         return GPIO_LINE_DIRECTION_OUT;
 467 }
 468
 469 static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
 470                                       unsigned long *mask, unsigned long *bits)
 471 {
 472         struct pca953x_chip *chip = gpiochip_get_data(gc);
 473         DECLARE_BITMAP(reg_val, MAX_LINE);
 474         int ret;
 475
 476         mutex_lock(&chip->i2c_lock);
 477         ret = pca953x_read_regs(chip, chip->regs->output, reg_val);
 478         if (ret)
 479                 goto exit;
 480
 481         bitmap_replace(reg_val, reg_val, bits, mask, gc->ngpio);
 482
 483         pca953x_write_regs(chip, chip->regs->output, reg_val);
 484 exit:
 485         mutex_unlock(&chip->i2c_lock);
 486 }
 487
 488 static int pca953x_gpio_set_pull_up_down(struct pca953x_chip *chip,
 489                                          unsigned int offset,
 490                                          unsigned long config)
 491 {
 492         u8 pull_en_reg = pca953x_recalc_addr(chip, PCAL953X_PULL_EN, offset,
 493                                              true, false);
 494         u8 pull_sel_reg = pca953x_recalc_addr(chip, PCAL953X_PULL_SEL, offset,
 495                                               true, false);
 496         u8 bit = BIT(offset % BANK_SZ);
 497         int ret;
 498
 499         /*
 500          * pull-up/pull-down configuration requires PCAL extended
 501          * registers
 502          */
 503         if (!(chip->driver_data & PCA_PCAL))
 504                 return -ENOTSUPP;
 505
 506         mutex_lock(&chip->i2c_lock);
 507
 508         /* Disable pull-up/pull-down */
 509         ret = regmap_write_bits(chip->regmap, pull_en_reg, bit, 0);
 510         if (ret)
 511                 goto exit;
 512
 513         /* Configure pull-up/pull-down */
 514         if (config == PIN_CONFIG_BIAS_PULL_UP)
 515                 ret = regmap_write_bits(chip->regmap, pull_sel_reg, bit, bit);
 516         else if (config == PIN_CONFIG_BIAS_PULL_DOWN)
 517                 ret = regmap_write_bits(chip->regmap, pull_sel_reg, bit, 0);
 518         if (ret)
 519                 goto exit;
 520
 521         /* Enable pull-up/pull-down */
 522         ret = regmap_write_bits(chip->regmap, pull_en_reg, bit, bit);
 523
 524 exit:
 525         mutex_unlock(&chip->i2c_lock);
 526         return ret;
 527 }
 528
 529 static int pca953x_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
 530                                    unsigned long config)
 531 {
 532         struct pca953x_chip *chip = gpiochip_get_data(gc);
 533
 534         switch (pinconf_to_config_param(config)) {
 535         case PIN_CONFIG_BIAS_PULL_UP:
 536         case PIN_CONFIG_BIAS_PULL_DOWN:
 537                 return pca953x_gpio_set_pull_up_down(chip, offset, config);
 538         default:
 539                 return -ENOTSUPP;
 540         }
 541 }
 542
 543 static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
 544 {
 545         struct gpio_chip *gc;
 546
 547         gc = &chip->gpio_chip;
 548
 549         gc->direction_input  = pca953x_gpio_direction_input;
 550         gc->direction_output = pca953x_gpio_direction_output;
 551         gc->get = pca953x_gpio_get_value;
 552         gc->set = pca953x_gpio_set_value;
 553         gc->get_direction = pca953x_gpio_get_direction;
 554         gc->set_multiple = pca953x_gpio_set_multiple;
 555         gc->set_config = pca953x_gpio_set_config;
 556         gc->can_sleep = true;
 557
 558         gc->base = chip->gpio_start;
 559         gc->ngpio = gpios;
 560         gc->label = dev_name(&chip->client->dev);
 561         gc->parent = &chip->client->dev;
 562         gc->owner = THIS_MODULE;
 563         gc->names = chip->names;
 564 }
 565
 566 #ifdef CONFIG_GPIO_PCA953X_IRQ
 567 static void pca953x_irq_mask(struct irq_data *d)
 568 {
 569         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 570         struct pca953x_chip *chip = gpiochip_get_data(gc);
 571         irq_hw_number_t hwirq = irqd_to_hwirq(d);
 572
 573         clear_bit(hwirq, chip->irq_mask);
 574 }
 575
 576 static void pca953x_irq_unmask(struct irq_data *d)
 577 {
 578         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 579         struct pca953x_chip *chip = gpiochip_get_data(gc);
 580         irq_hw_number_t hwirq = irqd_to_hwirq(d);
 581
 582         set_bit(hwirq, chip->irq_mask);
 583 }
 584
 585 static int pca953x_irq_set_wake(struct irq_data *d, unsigned int on)
 586 {
 587         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 588         struct pca953x_chip *chip = gpiochip_get_data(gc);
 589
 590         if (on)
 591                 atomic_inc(&chip->wakeup_path);
 592         else
 593                 atomic_dec(&chip->wakeup_path);
 594
 595         return irq_set_irq_wake(chip->client->irq, on);
 596 }
 597
 598 static void pca953x_irq_bus_lock(struct irq_data *d)
 599 {
 600         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 601         struct pca953x_chip *chip = gpiochip_get_data(gc);
 602
 603         mutex_lock(&chip->irq_lock);
 604 }
 605
 606 static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
 607 {
 608         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 609         struct pca953x_chip *chip = gpiochip_get_data(gc);
 610         DECLARE_BITMAP(irq_mask, MAX_LINE);
 611         DECLARE_BITMAP(reg_direction, MAX_LINE);
 612         int level;
 613
 614         pca953x_read_regs(chip, chip->regs->direction, reg_direction);
 615
 616         if (chip->driver_data & PCA_PCAL) {
 617                 /* Enable latch on interrupt-enabled inputs */
 618                 pca953x_write_regs(chip, PCAL953X_IN_LATCH, chip->irq_mask);
 619
 620                 bitmap_complement(irq_mask, chip->irq_mask, gc->ngpio);
 621
 622                 /* Unmask enabled interrupts */
 623                 pca953x_write_regs(chip, PCAL953X_INT_MASK, irq_mask);
 624         }
 625
 626         bitmap_or(irq_mask, chip->irq_trig_fall, chip->irq_trig_raise, gc->ngpio);
 627         bitmap_and(irq_mask, irq_mask, reg_direction, gc->ngpio);
 628
 629         /* Look for any newly setup interrupt */
 630         for_each_set_bit(level, irq_mask, gc->ngpio)
 631                 pca953x_gpio_direction_input(&chip->gpio_chip, level);
 632
 633         mutex_unlock(&chip->irq_lock);
 634 }
 635
 636 static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
 637 {
 638         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 639         struct pca953x_chip *chip = gpiochip_get_data(gc);
 640         irq_hw_number_t hwirq = irqd_to_hwirq(d);
 641
 642         if (!(type & IRQ_TYPE_EDGE_BOTH)) {
 643                 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
 644                         d->irq, type);
 645                 return -EINVAL;
 646         }
 647
 648         assign_bit(hwirq, chip->irq_trig_fall, type & IRQ_TYPE_EDGE_FALLING);
 649         assign_bit(hwirq, chip->irq_trig_raise, type & IRQ_TYPE_EDGE_RISING);
 650
 651         return 0;
 652 }
 653
 654 static void pca953x_irq_shutdown(struct irq_data *d)
 655 {
 656         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 657         struct pca953x_chip *chip = gpiochip_get_data(gc);
 658         irq_hw_number_t hwirq = irqd_to_hwirq(d);
 659
 660         clear_bit(hwirq, chip->irq_trig_raise);
 661         clear_bit(hwirq, chip->irq_trig_fall);
 662 }
 663
 664 static bool pca953x_irq_pending(struct pca953x_chip *chip, unsigned long *pending)
 665 {
 666         struct gpio_chip *gc = &chip->gpio_chip;
 667         DECLARE_BITMAP(reg_direction, MAX_LINE);
 668         DECLARE_BITMAP(old_stat, MAX_LINE);
 669         DECLARE_BITMAP(cur_stat, MAX_LINE);
 670         DECLARE_BITMAP(new_stat, MAX_LINE);
 671         DECLARE_BITMAP(trigger, MAX_LINE);
 672         int ret;
 673
 674         if (chip->driver_data & PCA_PCAL) {
 675                 /* Read the current interrupt status from the device */
 676                 ret = pca953x_read_regs(chip, PCAL953X_INT_STAT, trigger);
 677                 if (ret)
 678                         return false;
 679
 680                 /* Check latched inputs and clear interrupt status */
 681                 ret = pca953x_read_regs(chip, chip->regs->input, cur_stat);
 682                 if (ret)
 683                         return false;
 684
 685                 /* Apply filter for rising/falling edge selection */
 686                 bitmap_replace(new_stat, chip->irq_trig_fall, chip->irq_trig_raise, cur_stat, gc->ngpio);
 687
 688                 bitmap_and(pending, new_stat, trigger, gc->ngpio);
 689
 690                 return !bitmap_empty(pending, gc->ngpio);
 691         }
 692
 693         ret = pca953x_read_regs(chip, chip->regs->input, cur_stat);
 694         if (ret)
 695                 return false;
 696
 697         /* Remove output pins from the equation */
 698         pca953x_read_regs(chip, chip->regs->direction, reg_direction);
 699
 700         bitmap_copy(old_stat, chip->irq_stat, gc->ngpio);
 701
 702         bitmap_and(new_stat, cur_stat, reg_direction, gc->ngpio);
 703         bitmap_xor(cur_stat, new_stat, old_stat, gc->ngpio);
 704         bitmap_and(trigger, cur_stat, chip->irq_mask, gc->ngpio);
 705
 706         if (bitmap_empty(trigger, gc->ngpio))
 707                 return false;
 708
 709         bitmap_copy(chip->irq_stat, new_stat, gc->ngpio);
 710
 711         bitmap_and(cur_stat, chip->irq_trig_fall, old_stat, gc->ngpio);
 712         bitmap_and(old_stat, chip->irq_trig_raise, new_stat, gc->ngpio);
 713         bitmap_or(new_stat, old_stat, cur_stat, gc->ngpio);
 714         bitmap_and(pending, new_stat, trigger, gc->ngpio);
 715
 716         return !bitmap_empty(pending, gc->ngpio);
 717 }
 718
 719 static irqreturn_t pca953x_irq_handler(int irq, void *devid)
 720 {
 721         struct pca953x_chip *chip = devid;
 722         struct gpio_chip *gc = &chip->gpio_chip;
 723         DECLARE_BITMAP(pending, MAX_LINE);
 724         int level;
 725
 726         if (!pca953x_irq_pending(chip, pending))
 727                 return IRQ_NONE;
 728
 729         for_each_set_bit(level, pending, gc->ngpio)
 730                 handle_nested_irq(irq_find_mapping(gc->irq.domain, level));
 731
 732         return IRQ_HANDLED;
 733 }
 734
 735 static int pca953x_irq_setup(struct pca953x_chip *chip, int irq_base)
 736 {
 737         struct i2c_client *client = chip->client;
 738         struct irq_chip *irq_chip = &chip->irq_chip;
 739         DECLARE_BITMAP(reg_direction, MAX_LINE);
 740         DECLARE_BITMAP(irq_stat, MAX_LINE);
 741         int ret;
 742
 743         if (!client->irq)
 744                 return 0;
 745
 746         if (irq_base == -1)
 747                 return 0;
 748
 749         if (!(chip->driver_data & PCA_INT))
 750                 return 0;
 751
 752         ret = pca953x_read_regs(chip, chip->regs->input, irq_stat);
 753         if (ret)
 754                 return ret;
 755
 756         /*
 757          * There is no way to know which GPIO line generated the
 758          * interrupt.  We have to rely on the previous read for
 759          * this purpose.
 760          */
 761         pca953x_read_regs(chip, chip->regs->direction, reg_direction);
 762         bitmap_and(chip->irq_stat, irq_stat, reg_direction, chip->gpio_chip.ngpio);
 763         mutex_init(&chip->irq_lock);
 764
 765         ret = devm_request_threaded_irq(&client->dev, client->irq,
 766                                         NULL, pca953x_irq_handler,
 767                                         IRQF_ONESHOT | IRQF_SHARED,
 768                                         dev_name(&client->dev), chip);
 769         if (ret) {
 770                 dev_err(&client->dev, "failed to request irq %d\n",
 771                         client->irq);
 772                 return ret;
 773         }
 774
 775         irq_chip->name = dev_name(&chip->client->dev);
 776         irq_chip->irq_mask = pca953x_irq_mask;
 777         irq_chip->irq_unmask = pca953x_irq_unmask;
 778         irq_chip->irq_set_wake = pca953x_irq_set_wake;
 779         irq_chip->irq_bus_lock = pca953x_irq_bus_lock;
 780         irq_chip->irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock;
 781         irq_chip->irq_set_type = pca953x_irq_set_type;
 782         irq_chip->irq_shutdown = pca953x_irq_shutdown;
 783
 784         ret = gpiochip_irqchip_add_nested(&chip->gpio_chip, irq_chip,
 785                                           irq_base, handle_simple_irq,
 786                                           IRQ_TYPE_NONE);
 787         if (ret) {
 788                 dev_err(&client->dev,
 789                         "could not connect irqchip to gpiochip\n");
 790                 return ret;
 791         }
 792
 793         gpiochip_set_nested_irqchip(&chip->gpio_chip, irq_chip, client->irq);
 794
 795         return 0;
 796 }
 797
 798 #else /* CONFIG_GPIO_PCA953X_IRQ */
 799 static int pca953x_irq_setup(struct pca953x_chip *chip,
 800                              int irq_base)
 801 {
 802         struct i2c_client *client = chip->client;
 803
 804         if (client->irq && irq_base != -1 && (chip->driver_data & PCA_INT))
 805                 dev_warn(&client->dev, "interrupt support not compiled in\n");
 806
 807         return 0;
 808 }
 809 #endif
 810
 811 static int device_pca95xx_init(struct pca953x_chip *chip, u32 invert)
 812 {
 813         DECLARE_BITMAP(val, MAX_LINE);
 814         int ret;
 815
 816         ret = regcache_sync_region(chip->regmap, chip->regs->output,
 817                                    chip->regs->output + NBANK(chip));
 818         if (ret)
 819                 goto out;
 820
 821         ret = regcache_sync_region(chip->regmap, chip->regs->direction,
 822                                    chip->regs->direction + NBANK(chip));
 823         if (ret)
 824                 goto out;
 825
 826         /* set platform specific polarity inversion */
 827         if (invert)
 828                 bitmap_fill(val, MAX_LINE);
 829         else
 830                 bitmap_zero(val, MAX_LINE);
 831
 832         ret = pca953x_write_regs(chip, chip->regs->invert, val);
 833 out:
 834         return ret;
 835 }
 836
 837 static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
 838 {
 839         DECLARE_BITMAP(val, MAX_LINE);
 840         int ret;
 841
 842         ret = device_pca95xx_init(chip, invert);
 843         if (ret)
 844                 goto out;
 845
 846         /* To enable register 6, 7 to control pull up and pull down */
 847         memset(val, 0x02, NBANK(chip));
 848         ret = pca953x_write_regs(chip, PCA957X_BKEN, val);
 849         if (ret)
 850                 goto out;
 851
 852         return 0;
 853 out:
 854         return ret;
 855 }
 856
 857 static int pca953x_probe(struct i2c_client *client,
 858                          const struct i2c_device_id *i2c_id)
 859 {
 860         struct pca953x_platform_data *pdata;
 861         struct pca953x_chip *chip;
 862         int irq_base = 0;
 863         int ret;
 864         u32 invert = 0;
 865         struct regulator *reg;
 866
 867         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 868         if (chip == NULL)
 869                 return -ENOMEM;
 870
 871         pdata = dev_get_platdata(&client->dev);
 872         if (pdata) {
 873                 irq_base = pdata->irq_base;
 874                 chip->gpio_start = pdata->gpio_base;
 875                 invert = pdata->invert;
 876                 chip->names = pdata->names;
 877         } else {
 878                 struct gpio_desc *reset_gpio;
 879
 880                 chip->gpio_start = -1;
 881                 irq_base = 0;
 882
 883                 /*
 884                  * See if we need to de-assert a reset pin.
 885                  *
 886                  * There is no known ACPI-enabled platforms that are
 887                  * using "reset" GPIO. Otherwise any of those platform
 888                  * must use _DSD method with corresponding property.
 889                  */
 890                 reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
 891                                                      GPIOD_OUT_LOW);
 892                 if (IS_ERR(reset_gpio))
 893                         return PTR_ERR(reset_gpio);
 894         }
 895
 896         chip->client = client;
 897
 898         reg = devm_regulator_get(&client->dev, "vcc");
 899         if (IS_ERR(reg)) {
 900                 ret = PTR_ERR(reg);
 901                 if (ret != -EPROBE_DEFER)
 902                         dev_err(&client->dev, "reg get err: %d\n", ret);
 903                 return ret;
 904         }
 905         ret = regulator_enable(reg);
 906         if (ret) {
 907                 dev_err(&client->dev, "reg en err: %d\n", ret);
 908                 return ret;
 909         }
 910         chip->regulator = reg;
 911
 912         if (i2c_id) {
 913                 chip->driver_data = i2c_id->driver_data;
 914         } else {
 915                 const void *match;
 916
 917                 match = device_get_match_data(&client->dev);
 918                 if (!match) {
 919                         ret = -ENODEV;
 920                         goto err_exit;
 921                 }
 922
 923                 chip->driver_data = (uintptr_t)match;
 924         }
 925
 926         i2c_set_clientdata(client, chip);
 927
 928         chip->regmap = devm_regmap_init_i2c(client, &pca953x_i2c_regmap);
 929         if (IS_ERR(chip->regmap)) {
 930                 ret = PTR_ERR(chip->regmap);
 931                 goto err_exit;
 932         }
 933
 934         regcache_mark_dirty(chip->regmap);
 935
 936         mutex_init(&chip->i2c_lock);
 937         /*
 938          * In case we have an i2c-mux controlled by a GPIO provided by an
 939          * expander using the same driver higher on the device tree, read the
 940          * i2c adapter nesting depth and use the retrieved value as lockdep
 941          * subclass for chip->i2c_lock.
 942          *
 943          * REVISIT: This solution is not complete. It protects us from lockdep
 944          * false positives when the expander controlling the i2c-mux is on
 945          * a different level on the device tree, but not when it's on the same
 946          * level on a different branch (in which case the subclass number
 947          * would be the same).
 948          *
 949          * TODO: Once a correct solution is developed, a similar fix should be
 950          * applied to all other i2c-controlled GPIO expanders (and potentially
 951          * regmap-i2c).
 952          */
 953         lockdep_set_subclass(&chip->i2c_lock,
 954                              i2c_adapter_depth(client->adapter));
 955
 956         /* initialize cached registers from their original values.
 957          * we can't share this chip with another i2c master.
 958          */
 959         pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK);
 960
 961         if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE) {
 962                 chip->regs = &pca953x_regs;
 963                 ret = device_pca95xx_init(chip, invert);
 964         } else {
 965                 chip->regs = &pca957x_regs;
 966                 ret = device_pca957x_init(chip, invert);
 967         }
 968         if (ret)
 969                 goto err_exit;
 970
 971         ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
 972         if (ret)
 973                 goto err_exit;
 974
 975         ret = pca953x_irq_setup(chip, irq_base);
 976         if (ret)
 977                 goto err_exit;
 978
 979         if (pdata && pdata->setup) {
 980                 ret = pdata->setup(client, chip->gpio_chip.base,
 981                                    chip->gpio_chip.ngpio, pdata->context);
 982                 if (ret < 0)
 983                         dev_warn(&client->dev, "setup failed, %d\n", ret);
 984         }
 985
 986         return 0;
 987
 988 err_exit:
 989         regulator_disable(chip->regulator);
 990         return ret;
 991 }
 992
 993 static int pca953x_remove(struct i2c_client *client)
 994 {
 995         struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
 996         struct pca953x_chip *chip = i2c_get_clientdata(client);
 997         int ret;
 998
 999         if (pdata && pdata->teardown) {
1000                 ret = pdata->teardown(client, chip->gpio_chip.base,
1001                                       chip->gpio_chip.ngpio, pdata->context);
1002                 if (ret < 0)
1003                         dev_err(&client->dev, "teardown failed, %d\n", ret);
1004         } else {
1005                 ret = 0;
1006         }
1007
1008         regulator_disable(chip->regulator);
1009
1010         return ret;
1011 }
1012
1013 #ifdef CONFIG_PM_SLEEP
1014 static int pca953x_regcache_sync(struct device *dev)
1015 {
1016         struct pca953x_chip *chip = dev_get_drvdata(dev);
1017         int ret;
1018
1019         /*
1020          * The ordering between direction and output is important,
1021          * sync these registers first and only then sync the rest.
1022          */
1023         ret = regcache_sync_region(chip->regmap, chip->regs->direction,
1024                                    chip->regs->direction + NBANK(chip));
1025         if (ret) {
1026                 dev_err(dev, "Failed to sync GPIO dir registers: %d\n", ret);
1027                 return ret;
1028         }
1029
1030         ret = regcache_sync_region(chip->regmap, chip->regs->output,
1031                                    chip->regs->output + NBANK(chip));
1032         if (ret) {
1033                 dev_err(dev, "Failed to sync GPIO out registers: %d\n", ret);
1034                 return ret;
1035         }
1036
1037 #ifdef CONFIG_GPIO_PCA953X_IRQ
1038         if (chip->driver_data & PCA_PCAL) {
1039                 ret = regcache_sync_region(chip->regmap, PCAL953X_IN_LATCH,
1040                                            PCAL953X_IN_LATCH + NBANK(chip));
1041                 if (ret) {
1042                         dev_err(dev, "Failed to sync INT latch registers: %d\n",
1043                                 ret);
1044                         return ret;
1045                 }
1046
1047                 ret = regcache_sync_region(chip->regmap, PCAL953X_INT_MASK,
1048                                            PCAL953X_INT_MASK + NBANK(chip));
1049                 if (ret) {
1050                         dev_err(dev, "Failed to sync INT mask registers: %d\n",
1051                                 ret);
1052                         return ret;
1053                 }
1054         }
1055 #endif
1056
1057         return 0;
1058 }
1059
1060 static int pca953x_suspend(struct device *dev)
1061 {
1062         struct pca953x_chip *chip = dev_get_drvdata(dev);
1063
1064         regcache_cache_only(chip->regmap, true);
1065
1066         if (atomic_read(&chip->wakeup_path))
1067                 device_set_wakeup_path(dev);
1068         else
1069                 regulator_disable(chip->regulator);
1070
1071         return 0;
1072 }
1073
1074 static int pca953x_resume(struct device *dev)
1075 {
1076         struct pca953x_chip *chip = dev_get_drvdata(dev);
1077         int ret;
1078
1079         if (!atomic_read(&chip->wakeup_path)) {
1080                 ret = regulator_enable(chip->regulator);
1081                 if (ret) {
1082                         dev_err(dev, "Failed to enable regulator: %d\n", ret);
1083                         return 0;
1084                 }
1085         }
1086
1087         regcache_cache_only(chip->regmap, false);
1088         regcache_mark_dirty(chip->regmap);
1089         ret = pca953x_regcache_sync(dev);
1090         if (ret)
1091                 return ret;
1092
1093         ret = regcache_sync(chip->regmap);
1094         if (ret) {
1095                 dev_err(dev, "Failed to restore register map: %d\n", ret);
1096                 return ret;
1097         }
1098
1099         return 0;
1100 }
1101 #endif
1102
1103 /* convenience to stop overlong match-table lines */
1104 #define OF_953X(__nrgpio, __int) (void *)(__nrgpio | PCA953X_TYPE | __int)
1105 #define OF_957X(__nrgpio, __int) (void *)(__nrgpio | PCA957X_TYPE | __int)
1106
1107 static const struct of_device_id pca953x_dt_ids[] = {
1108         { .compatible = "nxp,pca6416", .data = OF_953X(16, PCA_INT), },
1109         { .compatible = "nxp,pca9505", .data = OF_953X(40, PCA_INT), },
1110         { .compatible = "nxp,pca9534", .data = OF_953X( 8, PCA_INT), },
1111         { .compatible = "nxp,pca9535", .data = OF_953X(16, PCA_INT), },
1112         { .compatible = "nxp,pca9536", .data = OF_953X( 4, 0), },
1113         { .compatible = "nxp,pca9537", .data = OF_953X( 4, PCA_INT), },
1114         { .compatible = "nxp,pca9538", .data = OF_953X( 8, PCA_INT), },
1115         { .compatible = "nxp,pca9539", .data = OF_953X(16, PCA_INT), },
1116         { .compatible = "nxp,pca9554", .data = OF_953X( 8, PCA_INT), },
1117         { .compatible = "nxp,pca9555", .data = OF_953X(16, PCA_INT), },
1118         { .compatible = "nxp,pca9556", .data = OF_953X( 8, 0), },
1119         { .compatible = "nxp,pca9557", .data = OF_953X( 8, 0), },
1120         { .compatible = "nxp,pca9574", .data = OF_957X( 8, PCA_INT), },
1121         { .compatible = "nxp,pca9575", .data = OF_957X(16, PCA_INT), },
1122         { .compatible = "nxp,pca9698", .data = OF_953X(40, 0), },
1123
1124         { .compatible = "nxp,pcal6416", .data = OF_953X(16, PCA_LATCH_INT), },
1125         { .compatible = "nxp,pcal6524", .data = OF_953X(24, PCA_LATCH_INT), },
1126         { .compatible = "nxp,pcal9555a", .data = OF_953X(16, PCA_LATCH_INT), },
1127
1128         { .compatible = "maxim,max7310", .data = OF_953X( 8, 0), },
1129         { .compatible = "maxim,max7312", .data = OF_953X(16, PCA_INT), },
1130         { .compatible = "maxim,max7313", .data = OF_953X(16, PCA_INT), },
1131         { .compatible = "maxim,max7315", .data = OF_953X( 8, PCA_INT), },
1132         { .compatible = "maxim,max7318", .data = OF_953X(16, PCA_INT), },
1133
1134         { .compatible = "ti,pca6107", .data = OF_953X( 8, PCA_INT), },
1135         { .compatible = "ti,pca9536", .data = OF_953X( 4, 0), },
1136         { .compatible = "ti,tca6408", .data = OF_953X( 8, PCA_INT), },
1137         { .compatible = "ti,tca6416", .data = OF_953X(16, PCA_INT), },
1138         { .compatible = "ti,tca6424", .data = OF_953X(24, PCA_INT), },
1139         { .compatible = "ti,tca9539", .data = OF_953X(16, PCA_INT), },
1140
1141         { .compatible = "onnn,cat9554", .data = OF_953X( 8, PCA_INT), },
1142         { .compatible = "onnn,pca9654", .data = OF_953X( 8, PCA_INT), },
1143
1144         { .compatible = "exar,xra1202", .data = OF_953X( 8, 0), },
1145         { }
1146 };
1147
1148 MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
1149
1150 static SIMPLE_DEV_PM_OPS(pca953x_pm_ops, pca953x_suspend, pca953x_resume);
1151
1152 static struct i2c_driver pca953x_driver = {
1153         .driver = {
1154                 .name   = "pca953x",
1155                 .pm     = &pca953x_pm_ops,
1156                 .of_match_table = pca953x_dt_ids,
1157                 .acpi_match_table = ACPI_PTR(pca953x_acpi_ids),
1158         },
1159         .probe          = pca953x_probe,
1160         .remove         = pca953x_remove,
1161         .id_table       = pca953x_id,
1162 };
1163
1164 static int __init pca953x_init(void)
1165 {
1166         return i2c_add_driver(&pca953x_driver);
1167 }
1168 /* register after i2c postcore initcall and before
1169  * subsys initcalls that may rely on these GPIOs
1170  */
1171 subsys_initcall(pca953x_init);
1172
1173 static void __exit pca953x_exit(void)
1174 {
1175         i2c_del_driver(&pca953x_driver);
1176 }
1177 module_exit(pca953x_exit);
1178
1179 MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
1180 MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
1181 MODULE_LICENSE("GPL");