drivers/pinctrl/pinctrl-mcp23s08.c

   1 /* MCP23S08 SPI/I2C GPIO driver */
   2
   3 #include <linux/kernel.h>
   4 #include <linux/device.h>
   5 #include <linux/mutex.h>
   6 #include <linux/module.h>
   7 #include <linux/gpio/driver.h>
   8 #include <linux/i2c.h>
   9 #include <linux/spi/spi.h>
  10 #include <linux/spi/mcp23s08.h>
  11 #include <linux/slab.h>
  12 #include <asm/byteorder.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/of_device.h>
  15 #include <linux/regmap.h>
  16 #include <linux/pinctrl/pinctrl.h>
  17 #include <linux/pinctrl/pinconf.h>
  18 #include <linux/pinctrl/pinconf-generic.h>
  19
  20 /*
  21  * MCP types supported by driver
  22  */
  23 #define MCP_TYPE_S08    0
  24 #define MCP_TYPE_S17    1
  25 #define MCP_TYPE_008    2
  26 #define MCP_TYPE_017    3
  27 #define MCP_TYPE_S18    4
  28 #define MCP_TYPE_018    5
  29
  30 #define MCP_MAX_DEV_PER_CS      8
  31
  32 /* Registers are all 8 bits wide.
  33  *
  34  * The mcp23s17 has twice as many bits, and can be configured to work
  35  * with either 16 bit registers or with two adjacent 8 bit banks.
  36  */
  37 #define MCP_IODIR       0x00            /* init/reset:  all ones */
  38 #define MCP_IPOL        0x01
  39 #define MCP_GPINTEN     0x02
  40 #define MCP_DEFVAL      0x03
  41 #define MCP_INTCON      0x04
  42 #define MCP_IOCON       0x05
  43 #       define IOCON_MIRROR     (1 << 6)
  44 #       define IOCON_SEQOP      (1 << 5)
  45 #       define IOCON_HAEN       (1 << 3)
  46 #       define IOCON_ODR        (1 << 2)
  47 #       define IOCON_INTPOL     (1 << 1)
  48 #       define IOCON_INTCC      (1)
  49 #define MCP_GPPU        0x06
  50 #define MCP_INTF        0x07
  51 #define MCP_INTCAP      0x08
  52 #define MCP_GPIO        0x09
  53 #define MCP_OLAT        0x0a
  54
  55 struct mcp23s08;
  56
  57 struct mcp23s08 {
  58         u8                      addr;
  59         bool                    irq_active_high;
  60         bool                    reg_shift;
  61
  62         u16                     irq_rise;
  63         u16                     irq_fall;
  64         int                     irq;
  65         bool                    irq_controller;
  66         int                     cached_gpio;
  67         /* lock protects regmap access with bypass/cache flags */
  68         struct mutex            lock;
  69
  70         struct gpio_chip        chip;
  71
  72         struct regmap           *regmap;
  73         struct device           *dev;
  74
  75         struct pinctrl_dev      *pctldev;
  76         struct pinctrl_desc     pinctrl_desc;
  77 };
  78
  79 static const struct reg_default mcp23x08_defaults[] = {
  80         {.reg = MCP_IODIR,              .def = 0xff},
  81         {.reg = MCP_IPOL,               .def = 0x00},
  82         {.reg = MCP_GPINTEN,            .def = 0x00},
  83         {.reg = MCP_DEFVAL,             .def = 0x00},
  84         {.reg = MCP_INTCON,             .def = 0x00},
  85         {.reg = MCP_IOCON,              .def = 0x00},
  86         {.reg = MCP_GPPU,               .def = 0x00},
  87         {.reg = MCP_OLAT,               .def = 0x00},
  88 };
  89
  90 static const struct regmap_range mcp23x08_volatile_range = {
  91         .range_min = MCP_INTF,
  92         .range_max = MCP_GPIO,
  93 };
  94
  95 static const struct regmap_access_table mcp23x08_volatile_table = {
  96         .yes_ranges = &mcp23x08_volatile_range,
  97         .n_yes_ranges = 1,
  98 };
  99
 100 static const struct regmap_range mcp23x08_precious_range = {
 101         .range_min = MCP_GPIO,
 102         .range_max = MCP_GPIO,
 103 };
 104
 105 static const struct regmap_access_table mcp23x08_precious_table = {
 106         .yes_ranges = &mcp23x08_precious_range,
 107         .n_yes_ranges = 1,
 108 };
 109
 110 static const struct regmap_config mcp23x08_regmap = {
 111         .reg_bits = 8,
 112         .val_bits = 8,
 113
 114         .reg_stride = 1,
 115         .volatile_table = &mcp23x08_volatile_table,
 116         .precious_table = &mcp23x08_precious_table,
 117         .reg_defaults = mcp23x08_defaults,
 118         .num_reg_defaults = ARRAY_SIZE(mcp23x08_defaults),
 119         .cache_type = REGCACHE_FLAT,
 120         .max_register = MCP_OLAT,
 121 };
 122
 123 static const struct reg_default mcp23x16_defaults[] = {
 124         {.reg = MCP_IODIR << 1,         .def = 0xffff},
 125         {.reg = MCP_IPOL << 1,          .def = 0x0000},
 126         {.reg = MCP_GPINTEN << 1,       .def = 0x0000},
 127         {.reg = MCP_DEFVAL << 1,        .def = 0x0000},
 128         {.reg = MCP_INTCON << 1,        .def = 0x0000},
 129         {.reg = MCP_IOCON << 1,         .def = 0x0000},
 130         {.reg = MCP_GPPU << 1,          .def = 0x0000},
 131         {.reg = MCP_OLAT << 1,          .def = 0x0000},
 132 };
 133
 134 static const struct regmap_range mcp23x16_volatile_range = {
 135         .range_min = MCP_INTF << 1,
 136         .range_max = MCP_GPIO << 1,
 137 };
 138
 139 static const struct regmap_access_table mcp23x16_volatile_table = {
 140         .yes_ranges = &mcp23x16_volatile_range,
 141         .n_yes_ranges = 1,
 142 };
 143
 144 static const struct regmap_range mcp23x16_precious_range = {
 145         .range_min = MCP_GPIO << 1,
 146         .range_max = MCP_GPIO << 1,
 147 };
 148
 149 static const struct regmap_access_table mcp23x16_precious_table = {
 150         .yes_ranges = &mcp23x16_precious_range,
 151         .n_yes_ranges = 1,
 152 };
 153
 154 static const struct regmap_config mcp23x17_regmap = {
 155         .reg_bits = 8,
 156         .val_bits = 16,
 157
 158         .reg_stride = 2,
 159         .max_register = MCP_OLAT << 1,
 160         .volatile_table = &mcp23x16_volatile_table,
 161         .precious_table = &mcp23x16_precious_table,
 162         .reg_defaults = mcp23x16_defaults,
 163         .num_reg_defaults = ARRAY_SIZE(mcp23x16_defaults),
 164         .cache_type = REGCACHE_FLAT,
 165         .val_format_endian = REGMAP_ENDIAN_LITTLE,
 166 };
 167
 168 static int mcp_read(struct mcp23s08 *mcp, unsigned int reg, unsigned int *val)
 169 {
 170         return regmap_read(mcp->regmap, reg << mcp->reg_shift, val);
 171 }
 172
 173 static int mcp_write(struct mcp23s08 *mcp, unsigned int reg, unsigned int val)
 174 {
 175         return regmap_write(mcp->regmap, reg << mcp->reg_shift, val);
 176 }
 177
 178 static int mcp_set_mask(struct mcp23s08 *mcp, unsigned int reg,
 179                        unsigned int mask, bool enabled)
 180 {
 181         u16 val  = enabled ? 0xffff : 0x0000;
 182         return regmap_update_bits(mcp->regmap, reg << mcp->reg_shift,
 183                                   mask, val);
 184 }
 185
 186 static int mcp_set_bit(struct mcp23s08 *mcp, unsigned int reg,
 187                        unsigned int pin, bool enabled)
 188 {
 189         u16 mask = BIT(pin);
 190         return mcp_set_mask(mcp, reg, mask, enabled);
 191 }
 192
 193 static const struct pinctrl_pin_desc mcp23x08_pins[] = {
 194         PINCTRL_PIN(0, "gpio0"),
 195         PINCTRL_PIN(1, "gpio1"),
 196         PINCTRL_PIN(2, "gpio2"),
 197         PINCTRL_PIN(3, "gpio3"),
 198         PINCTRL_PIN(4, "gpio4"),
 199         PINCTRL_PIN(5, "gpio5"),
 200         PINCTRL_PIN(6, "gpio6"),
 201         PINCTRL_PIN(7, "gpio7"),
 202 };
 203
 204 static const struct pinctrl_pin_desc mcp23x17_pins[] = {
 205         PINCTRL_PIN(0, "gpio0"),
 206         PINCTRL_PIN(1, "gpio1"),
 207         PINCTRL_PIN(2, "gpio2"),
 208         PINCTRL_PIN(3, "gpio3"),
 209         PINCTRL_PIN(4, "gpio4"),
 210         PINCTRL_PIN(5, "gpio5"),
 211         PINCTRL_PIN(6, "gpio6"),
 212         PINCTRL_PIN(7, "gpio7"),
 213         PINCTRL_PIN(8, "gpio8"),
 214         PINCTRL_PIN(9, "gpio9"),
 215         PINCTRL_PIN(10, "gpio10"),
 216         PINCTRL_PIN(11, "gpio11"),
 217         PINCTRL_PIN(12, "gpio12"),
 218         PINCTRL_PIN(13, "gpio13"),
 219         PINCTRL_PIN(14, "gpio14"),
 220         PINCTRL_PIN(15, "gpio15"),
 221 };
 222
 223 static int mcp_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
 224 {
 225         return 0;
 226 }
 227
 228 static const char *mcp_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
 229                                                 unsigned int group)
 230 {
 231         return NULL;
 232 }
 233
 234 static int mcp_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
 235                                         unsigned int group,
 236                                         const unsigned int **pins,
 237                                         unsigned int *num_pins)
 238 {
 239         return -ENOTSUPP;
 240 }
 241
 242 static const struct pinctrl_ops mcp_pinctrl_ops = {
 243         .get_groups_count = mcp_pinctrl_get_groups_count,
 244         .get_group_name = mcp_pinctrl_get_group_name,
 245         .get_group_pins = mcp_pinctrl_get_group_pins,
 246 #ifdef CONFIG_OF
 247         .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
 248         .dt_free_map = pinconf_generic_dt_free_map,
 249 #endif
 250 };
 251
 252 static int mcp_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
 253                               unsigned long *config)
 254 {
 255         struct mcp23s08 *mcp = pinctrl_dev_get_drvdata(pctldev);
 256         enum pin_config_param param = pinconf_to_config_param(*config);
 257         unsigned int data, status;
 258         int ret;
 259
 260         switch (param) {
 261         case PIN_CONFIG_BIAS_PULL_UP:
 262                 ret = mcp_read(mcp, MCP_GPPU, &data);
 263                 if (ret < 0)
 264                         return ret;
 265                 status = (data & BIT(pin)) ? 1 : 0;
 266                 break;
 267         default:
 268                 dev_err(mcp->dev, "Invalid config param %04x\n", param);
 269                 return -ENOTSUPP;
 270         }
 271
 272         *config = 0;
 273
 274         return status ? 0 : -EINVAL;
 275 }
 276
 277 static int mcp_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
 278                               unsigned long *configs, unsigned int num_configs)
 279 {
 280         struct mcp23s08 *mcp = pinctrl_dev_get_drvdata(pctldev);
 281         enum pin_config_param param;
 282         u32 arg;
 283         int ret = 0;
 284         int i;
 285
 286         for (i = 0; i < num_configs; i++) {
 287                 param = pinconf_to_config_param(configs[i]);
 288                 arg = pinconf_to_config_argument(configs[i]);
 289
 290                 switch (param) {
 291                 case PIN_CONFIG_BIAS_PULL_UP:
 292                         ret = mcp_set_bit(mcp, MCP_GPPU, pin, arg);
 293                         break;
 294                 default:
 295                         dev_err(mcp->dev, "Invalid config param %04x\n", param);
 296                         return -ENOTSUPP;
 297                 }
 298         }
 299
 300         return ret;
 301 }
 302
 303 static const struct pinconf_ops mcp_pinconf_ops = {
 304         .pin_config_get = mcp_pinconf_get,
 305         .pin_config_set = mcp_pinconf_set,
 306         .is_generic = true,
 307 };
 308
 309 /*----------------------------------------------------------------------*/
 310
 311 #ifdef CONFIG_SPI_MASTER
 312
 313 static int mcp23sxx_spi_write(void *context, const void *data, size_t count)
 314 {
 315         struct mcp23s08 *mcp = context;
 316         struct spi_device *spi = to_spi_device(mcp->dev);
 317         struct spi_message m;
 318         struct spi_transfer t[2] = { { .tx_buf = &mcp->addr, .len = 1, },
 319                                      { .tx_buf = data, .len = count, }, };
 320
 321         spi_message_init(&m);
 322         spi_message_add_tail(&t[0], &m);
 323         spi_message_add_tail(&t[1], &m);
 324
 325         return spi_sync(spi, &m);
 326 }
 327
 328 static int mcp23sxx_spi_gather_write(void *context,
 329                                 const void *reg, size_t reg_size,
 330                                 const void *val, size_t val_size)
 331 {
 332         struct mcp23s08 *mcp = context;
 333         struct spi_device *spi = to_spi_device(mcp->dev);
 334         struct spi_message m;
 335         struct spi_transfer t[3] = { { .tx_buf = &mcp->addr, .len = 1, },
 336                                      { .tx_buf = reg, .len = reg_size, },
 337                                      { .tx_buf = val, .len = val_size, }, };
 338
 339         spi_message_init(&m);
 340         spi_message_add_tail(&t[0], &m);
 341         spi_message_add_tail(&t[1], &m);
 342         spi_message_add_tail(&t[2], &m);
 343
 344         return spi_sync(spi, &m);
 345 }
 346
 347 static int mcp23sxx_spi_read(void *context, const void *reg, size_t reg_size,
 348                                 void *val, size_t val_size)
 349 {
 350         struct mcp23s08 *mcp = context;
 351         struct spi_device *spi = to_spi_device(mcp->dev);
 352         u8 tx[2];
 353
 354         if (reg_size != 1)
 355                 return -EINVAL;
 356
 357         tx[0] = mcp->addr | 0x01;
 358         tx[1] = *((u8 *) reg);
 359
 360         return spi_write_then_read(spi, tx, sizeof(tx), val, val_size);
 361 }
 362
 363 static const struct regmap_bus mcp23sxx_spi_regmap = {
 364         .write = mcp23sxx_spi_write,
 365         .gather_write = mcp23sxx_spi_gather_write,
 366         .read = mcp23sxx_spi_read,
 367 };
 368
 369 #endif /* CONFIG_SPI_MASTER */
 370
 371 /*----------------------------------------------------------------------*/
 372
 373 /* A given spi_device can represent up to eight mcp23sxx chips
 374  * sharing the same chipselect but using different addresses
 375  * (e.g. chips #0 and #3 might be populated, but not #1 or $2).
 376  * Driver data holds all the per-chip data.
 377  */
 378 struct mcp23s08_driver_data {
 379         unsigned                ngpio;
 380         struct mcp23s08         *mcp[8];
 381         struct mcp23s08         chip[];
 382 };
 383
 384
 385 static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset)
 386 {
 387         struct mcp23s08 *mcp = gpiochip_get_data(chip);
 388         int status;
 389
 390         mutex_lock(&mcp->lock);
 391         status = mcp_set_bit(mcp, MCP_IODIR, offset, true);
 392         mutex_unlock(&mcp->lock);
 393
 394         return status;
 395 }
 396
 397 static int mcp23s08_get(struct gpio_chip *chip, unsigned offset)
 398 {
 399         struct mcp23s08 *mcp = gpiochip_get_data(chip);
 400         int status, ret;
 401
 402         mutex_lock(&mcp->lock);
 403
 404         /* REVISIT reading this clears any IRQ ... */
 405         ret = mcp_read(mcp, MCP_GPIO, &status);
 406         if (ret < 0)
 407                 status = 0;
 408         else {
 409                 mcp->cached_gpio = status;
 410                 status = !!(status & (1 << offset));
 411         }
 412
 413         mutex_unlock(&mcp->lock);
 414         return status;
 415 }
 416
 417 static int __mcp23s08_set(struct mcp23s08 *mcp, unsigned mask, bool value)
 418 {
 419         return mcp_set_mask(mcp, MCP_OLAT, mask, value);
 420 }
 421
 422 static void mcp23s08_set(struct gpio_chip *chip, unsigned offset, int value)
 423 {
 424         struct mcp23s08 *mcp = gpiochip_get_data(chip);
 425         unsigned mask = BIT(offset);
 426
 427         mutex_lock(&mcp->lock);
 428         __mcp23s08_set(mcp, mask, !!value);
 429         mutex_unlock(&mcp->lock);
 430 }
 431
 432 static int
 433 mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value)
 434 {
 435         struct mcp23s08 *mcp = gpiochip_get_data(chip);
 436         unsigned mask = BIT(offset);
 437         int status;
 438
 439         mutex_lock(&mcp->lock);
 440         status = __mcp23s08_set(mcp, mask, value);
 441         if (status == 0) {
 442                 status = mcp_set_mask(mcp, MCP_IODIR, mask, false);
 443         }
 444         mutex_unlock(&mcp->lock);
 445         return status;
 446 }
 447
 448 /*----------------------------------------------------------------------*/
 449 static irqreturn_t mcp23s08_irq(int irq, void *data)
 450 {
 451         struct mcp23s08 *mcp = data;
 452         int intcap, intcon, intf, i, gpio, gpio_orig, intcap_mask, defval;
 453         unsigned int child_irq;
 454         bool intf_set, intcap_changed, gpio_bit_changed,
 455                 defval_changed, gpio_set;
 456
 457         mutex_lock(&mcp->lock);
 458         if (mcp_read(mcp, MCP_INTF, &intf))
 459                 goto unlock;
 460
 461         if (mcp_read(mcp, MCP_INTCAP, &intcap))
 462                 goto unlock;
 463
 464         if (mcp_read(mcp, MCP_INTCON, &intcon))
 465                 goto unlock;
 466
 467         if (mcp_read(mcp, MCP_DEFVAL, &defval))
 468                 goto unlock;
 469
 470         /* This clears the interrupt(configurable on S18) */
 471         if (mcp_read(mcp, MCP_GPIO, &gpio))
 472                 goto unlock;
 473
 474         gpio_orig = mcp->cached_gpio;
 475         mcp->cached_gpio = gpio;
 476         mutex_unlock(&mcp->lock);
 477
 478         if (intf == 0) {
 479                 /* There is no interrupt pending */
 480                 return IRQ_HANDLED;
 481         }
 482
 483         dev_dbg(mcp->chip.parent,
 484                 "intcap 0x%04X intf 0x%04X gpio_orig 0x%04X gpio 0x%04X\n",
 485                 intcap, intf, gpio_orig, gpio);
 486
 487         for (i = 0; i < mcp->chip.ngpio; i++) {
 488                 /* We must check all of the inputs on the chip,
 489                  * otherwise we may not notice a change on >=2 pins.
 490                  *
 491                  * On at least the mcp23s17, INTCAP is only updated
 492                  * one byte at a time(INTCAPA and INTCAPB are
 493                  * not written to at the same time - only on a per-bank
 494                  * basis).
 495                  *
 496                  * INTF only contains the single bit that caused the
 497                  * interrupt per-bank.  On the mcp23s17, there is
 498                  * INTFA and INTFB.  If two pins are changed on the A
 499                  * side at the same time, INTF will only have one bit
 500                  * set.  If one pin on the A side and one pin on the B
 501                  * side are changed at the same time, INTF will have
 502                  * two bits set.  Thus, INTF can't be the only check
 503                  * to see if the input has changed.
 504                  */
 505
 506                 intf_set = intf & BIT(i);
 507                 if (i < 8 && intf_set)
 508                         intcap_mask = 0x00FF;
 509                 else if (i >= 8 && intf_set)
 510                         intcap_mask = 0xFF00;
 511                 else
 512                         intcap_mask = 0x00;
 513
 514                 intcap_changed = (intcap_mask &
 515                         (intcap & BIT(i))) !=
 516                         (intcap_mask & (BIT(i) & gpio_orig));
 517                 gpio_set = BIT(i) & gpio;
 518                 gpio_bit_changed = (BIT(i) & gpio_orig) !=
 519                         (BIT(i) & gpio);
 520                 defval_changed = (BIT(i) & intcon) &&
 521                         ((BIT(i) & gpio) !=
 522                         (BIT(i) & defval));
 523
 524                 if (((gpio_bit_changed || intcap_changed) &&
 525                         (BIT(i) & mcp->irq_rise) && gpio_set) ||
 526                     ((gpio_bit_changed || intcap_changed) &&
 527                         (BIT(i) & mcp->irq_fall) && !gpio_set) ||
 528                     defval_changed) {
 529                         child_irq = irq_find_mapping(mcp->chip.irq.domain, i);
 530                         handle_nested_irq(child_irq);
 531                 }
 532         }
 533
 534         return IRQ_HANDLED;
 535
 536 unlock:
 537         mutex_unlock(&mcp->lock);
 538         return IRQ_HANDLED;
 539 }
 540
 541 static void mcp23s08_irq_mask(struct irq_data *data)
 542 {
 543         struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
 544         struct mcp23s08 *mcp = gpiochip_get_data(gc);
 545         unsigned int pos = data->hwirq;
 546
 547         mcp_set_bit(mcp, MCP_GPINTEN, pos, false);
 548 }
 549
 550 static void mcp23s08_irq_unmask(struct irq_data *data)
 551 {
 552         struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
 553         struct mcp23s08 *mcp = gpiochip_get_data(gc);
 554         unsigned int pos = data->hwirq;
 555
 556         mcp_set_bit(mcp, MCP_GPINTEN, pos, true);
 557 }
 558
 559 static int mcp23s08_irq_set_type(struct irq_data *data, unsigned int type)
 560 {
 561         struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
 562         struct mcp23s08 *mcp = gpiochip_get_data(gc);
 563         unsigned int pos = data->hwirq;
 564         int status = 0;
 565
 566         if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
 567                 mcp_set_bit(mcp, MCP_INTCON, pos, false);
 568                 mcp->irq_rise |= BIT(pos);
 569                 mcp->irq_fall |= BIT(pos);
 570         } else if (type & IRQ_TYPE_EDGE_RISING) {
 571                 mcp_set_bit(mcp, MCP_INTCON, pos, false);
 572                 mcp->irq_rise |= BIT(pos);
 573                 mcp->irq_fall &= ~BIT(pos);
 574         } else if (type & IRQ_TYPE_EDGE_FALLING) {
 575                 mcp_set_bit(mcp, MCP_INTCON, pos, false);
 576                 mcp->irq_rise &= ~BIT(pos);
 577                 mcp->irq_fall |= BIT(pos);
 578         } else if (type & IRQ_TYPE_LEVEL_HIGH) {
 579                 mcp_set_bit(mcp, MCP_INTCON, pos, true);
 580                 mcp_set_bit(mcp, MCP_DEFVAL, pos, false);
 581         } else if (type & IRQ_TYPE_LEVEL_LOW) {
 582                 mcp_set_bit(mcp, MCP_INTCON, pos, true);
 583                 mcp_set_bit(mcp, MCP_DEFVAL, pos, true);
 584         } else
 585                 return -EINVAL;
 586
 587         return status;
 588 }
 589
 590 static void mcp23s08_irq_bus_lock(struct irq_data *data)
 591 {
 592         struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
 593         struct mcp23s08 *mcp = gpiochip_get_data(gc);
 594
 595         mutex_lock(&mcp->lock);
 596         regcache_cache_only(mcp->regmap, true);
 597 }
 598
 599 static void mcp23s08_irq_bus_unlock(struct irq_data *data)
 600 {
 601         struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
 602         struct mcp23s08 *mcp = gpiochip_get_data(gc);
 603
 604         regcache_cache_only(mcp->regmap, false);
 605         regcache_sync(mcp->regmap);
 606
 607         mutex_unlock(&mcp->lock);
 608 }
 609
 610 static struct irq_chip mcp23s08_irq_chip = {
 611         .name = "gpio-mcp23xxx",
 612         .irq_mask = mcp23s08_irq_mask,
 613         .irq_unmask = mcp23s08_irq_unmask,
 614         .irq_set_type = mcp23s08_irq_set_type,
 615         .irq_bus_lock = mcp23s08_irq_bus_lock,
 616         .irq_bus_sync_unlock = mcp23s08_irq_bus_unlock,
 617 };
 618
 619 static int mcp23s08_irq_setup(struct mcp23s08 *mcp)
 620 {
 621         struct gpio_chip *chip = &mcp->chip;
 622         int err;
 623         unsigned long irqflags = IRQF_ONESHOT | IRQF_SHARED;
 624
 625         if (mcp->irq_active_high)
 626                 irqflags |= IRQF_TRIGGER_HIGH;
 627         else
 628                 irqflags |= IRQF_TRIGGER_LOW;
 629
 630         err = devm_request_threaded_irq(chip->parent, mcp->irq, NULL,
 631                                         mcp23s08_irq,
 632                                         irqflags, dev_name(chip->parent), mcp);
 633         if (err != 0) {
 634                 dev_err(chip->parent, "unable to request IRQ#%d: %d\n",
 635                         mcp->irq, err);
 636                 return err;
 637         }
 638
 639         return 0;
 640 }
 641
 642 static int mcp23s08_irqchip_setup(struct mcp23s08 *mcp)
 643 {
 644         struct gpio_chip *chip = &mcp->chip;
 645         int err;
 646
 647         err =  gpiochip_irqchip_add_nested(chip,
 648                                            &mcp23s08_irq_chip,
 649                                            0,
 650                                            handle_simple_irq,
 651                                            IRQ_TYPE_NONE);
 652         if (err) {
 653                 dev_err(chip->parent,
 654                         "could not connect irqchip to gpiochip: %d\n", err);
 655                 return err;
 656         }
 657
 658         gpiochip_set_nested_irqchip(chip,
 659                                     &mcp23s08_irq_chip,
 660                                     mcp->irq);
 661
 662         return 0;
 663 }
 664
 665 /*----------------------------------------------------------------------*/
 666
 667 #ifdef CONFIG_DEBUG_FS
 668
 669 #include <linux/seq_file.h>
 670
 671 /*
 672  * This compares the chip's registers with the register
 673  * cache and corrects any incorrectly set register. This
 674  * can be used to fix state for MCP23xxx, that temporary
 675  * lost its power supply.
 676  */
 677 #define MCP23S08_CONFIG_REGS 7
 678 static int __check_mcp23s08_reg_cache(struct mcp23s08 *mcp)
 679 {
 680         int cached[MCP23S08_CONFIG_REGS];
 681         int err = 0, i;
 682
 683         /* read cached config registers */
 684         for (i = 0; i < MCP23S08_CONFIG_REGS; i++) {
 685                 err = mcp_read(mcp, i, &cached[i]);
 686                 if (err)
 687                         goto out;
 688         }
 689
 690         regcache_cache_bypass(mcp->regmap, true);
 691
 692         for (i = 0; i < MCP23S08_CONFIG_REGS; i++) {
 693                 int uncached;
 694                 err = mcp_read(mcp, i, &uncached);
 695                 if (err)
 696                         goto out;
 697
 698                 if (uncached != cached[i]) {
 699                         dev_err(mcp->dev, "restoring reg 0x%02x from 0x%04x to 0x%04x (power-loss?)\n",
 700                                 i, uncached, cached[i]);
 701                         mcp_write(mcp, i, cached[i]);
 702                 }
 703         }
 704
 705 out:
 706         if (err)
 707                 dev_err(mcp->dev, "read error: reg=%02x, err=%d", i, err);
 708         regcache_cache_bypass(mcp->regmap, false);
 709         return err;
 710 }
 711
 712 /*
 713  * This shows more info than the generic gpio dump code:
 714  * pullups, deglitching, open drain drive.
 715  */
 716 static void mcp23s08_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 717 {
 718         struct mcp23s08 *mcp;
 719         char            bank;
 720         int             t;
 721         unsigned        mask;
 722         int iodir, gpio, gppu;
 723
 724         mcp = gpiochip_get_data(chip);
 725
 726         /* NOTE: we only handle one bank for now ... */
 727         bank = '0' + ((mcp->addr >> 1) & 0x7);
 728
 729         mutex_lock(&mcp->lock);
 730
 731         t = __check_mcp23s08_reg_cache(mcp);
 732         if (t) {
 733                 seq_printf(s, " I/O Error\n");
 734                 goto done;
 735         }
 736         t = mcp_read(mcp, MCP_IODIR, &iodir);
 737         if (t) {
 738                 seq_printf(s, " I/O Error\n");
 739                 goto done;
 740         }
 741         t = mcp_read(mcp, MCP_GPIO, &gpio);
 742         if (t) {
 743                 seq_printf(s, " I/O Error\n");
 744                 goto done;
 745         }
 746         t = mcp_read(mcp, MCP_GPPU, &gppu);
 747         if (t) {
 748                 seq_printf(s, " I/O Error\n");
 749                 goto done;
 750         }
 751
 752         for (t = 0, mask = BIT(0); t < chip->ngpio; t++, mask <<= 1) {
 753                 const char *label;
 754
 755                 label = gpiochip_is_requested(chip, t);
 756                 if (!label)
 757                         continue;
 758
 759                 seq_printf(s, " gpio-%-3d P%c.%d (%-12s) %s %s %s\n",
 760                            chip->base + t, bank, t, label,
 761                            (iodir & mask) ? "in " : "out",
 762                            (gpio & mask) ? "hi" : "lo",
 763                            (gppu & mask) ? "up" : "  ");
 764                 /* NOTE:  ignoring the irq-related registers */
 765         }
 766 done:
 767         mutex_unlock(&mcp->lock);
 768 }
 769
 770 #else
 771 #define mcp23s08_dbg_show       NULL
 772 #endif
 773
 774 /*----------------------------------------------------------------------*/
 775
 776 static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
 777                               void *data, unsigned addr, unsigned type,
 778                               unsigned int base, int cs)
 779 {
 780         int status, ret;
 781         bool mirror = false;
 782         bool open_drain = false;
 783         struct regmap_config *one_regmap_config = NULL;
 784         int raw_chip_address = (addr & ~0x40) >> 1;
 785
 786         mutex_init(&mcp->lock);
 787
 788         mcp->dev = dev;
 789         mcp->addr = addr;
 790         mcp->irq_active_high = false;
 791
 792         mcp->chip.direction_input = mcp23s08_direction_input;
 793         mcp->chip.get = mcp23s08_get;
 794         mcp->chip.direction_output = mcp23s08_direction_output;
 795         mcp->chip.set = mcp23s08_set;
 796         mcp->chip.dbg_show = mcp23s08_dbg_show;
 797 #ifdef CONFIG_OF_GPIO
 798         mcp->chip.of_gpio_n_cells = 2;
 799         mcp->chip.of_node = dev->of_node;
 800 #endif
 801
 802         switch (type) {
 803 #ifdef CONFIG_SPI_MASTER
 804         case MCP_TYPE_S08:
 805         case MCP_TYPE_S17:
 806                 switch (type) {
 807                 case MCP_TYPE_S08:
 808                         one_regmap_config =
 809                                 devm_kmemdup(dev, &mcp23x08_regmap,
 810                                         sizeof(struct regmap_config), GFP_KERNEL);
 811                         mcp->reg_shift = 0;
 812                         mcp->chip.ngpio = 8;
 813                         mcp->chip.label = devm_kasprintf(dev, GFP_KERNEL,
 814                                         "mcp23s08.%d", raw_chip_address);
 815                         break;
 816                 case MCP_TYPE_S17:
 817                         one_regmap_config =
 818                                 devm_kmemdup(dev, &mcp23x17_regmap,
 819                                         sizeof(struct regmap_config), GFP_KERNEL);
 820                         mcp->reg_shift = 1;
 821                         mcp->chip.ngpio = 16;
 822                         mcp->chip.label = devm_kasprintf(dev, GFP_KERNEL,
 823                                         "mcp23s17.%d", raw_chip_address);
 824                         break;
 825                 }
 826                 if (!one_regmap_config)
 827                         return -ENOMEM;
 828
 829                 one_regmap_config->name = devm_kasprintf(dev, GFP_KERNEL, "%d", raw_chip_address);
 830                 mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp,
 831                                                one_regmap_config);
 832                 break;
 833
 834         case MCP_TYPE_S18:
 835                 one_regmap_config =
 836                         devm_kmemdup(dev, &mcp23x17_regmap,
 837                                 sizeof(struct regmap_config), GFP_KERNEL);
 838                 if (!one_regmap_config)
 839                         return -ENOMEM;
 840                 mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp,
 841                                                one_regmap_config);
 842                 mcp->reg_shift = 1;
 843                 mcp->chip.ngpio = 16;
 844                 mcp->chip.label = "mcp23s18";
 845                 break;
 846 #endif /* CONFIG_SPI_MASTER */
 847
 848 #if IS_ENABLED(CONFIG_I2C)
 849         case MCP_TYPE_008:
 850                 mcp->regmap = devm_regmap_init_i2c(data, &mcp23x08_regmap);
 851                 mcp->reg_shift = 0;
 852                 mcp->chip.ngpio = 8;
 853                 mcp->chip.label = "mcp23008";
 854                 break;
 855
 856         case MCP_TYPE_017:
 857                 mcp->regmap = devm_regmap_init_i2c(data, &mcp23x17_regmap);
 858                 mcp->reg_shift = 1;
 859                 mcp->chip.ngpio = 16;
 860                 mcp->chip.label = "mcp23017";
 861                 break;
 862
 863         case MCP_TYPE_018:
 864                 mcp->regmap = devm_regmap_init_i2c(data, &mcp23x17_regmap);
 865                 mcp->reg_shift = 1;
 866                 mcp->chip.ngpio = 16;
 867                 mcp->chip.label = "mcp23018";
 868                 break;
 869 #endif /* CONFIG_I2C */
 870
 871         default:
 872                 dev_err(dev, "invalid device type (%d)\n", type);
 873                 return -EINVAL;
 874         }
 875
 876         if (IS_ERR(mcp->regmap))
 877                 return PTR_ERR(mcp->regmap);
 878
 879         mcp->chip.base = base;
 880         mcp->chip.can_sleep = true;
 881         mcp->chip.parent = dev;
 882         mcp->chip.owner = THIS_MODULE;
 883
 884         /* verify MCP_IOCON.SEQOP = 0, so sequential reads work,
 885          * and MCP_IOCON.HAEN = 1, so we work with all chips.
 886          */
 887
 888         ret = mcp_read(mcp, MCP_IOCON, &status);
 889         if (ret < 0)
 890                 goto fail;
 891
 892         mcp->irq_controller =
 893                 device_property_read_bool(dev, "interrupt-controller");
 894         if (mcp->irq && mcp->irq_controller) {
 895                 mcp->irq_active_high =
 896                         device_property_read_bool(dev,
 897                                               "microchip,irq-active-high");
 898
 899                 mirror = device_property_read_bool(dev, "microchip,irq-mirror");
 900                 open_drain = device_property_read_bool(dev, "drive-open-drain");
 901         }
 902
 903         if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN) || mirror ||
 904              mcp->irq_active_high || open_drain) {
 905                 /* mcp23s17 has IOCON twice, make sure they are in sync */
 906                 status &= ~(IOCON_SEQOP | (IOCON_SEQOP << 8));
 907                 status |= IOCON_HAEN | (IOCON_HAEN << 8);
 908                 if (mcp->irq_active_high)
 909                         status |= IOCON_INTPOL | (IOCON_INTPOL << 8);
 910                 else
 911                         status &= ~(IOCON_INTPOL | (IOCON_INTPOL << 8));
 912
 913                 if (mirror)
 914                         status |= IOCON_MIRROR | (IOCON_MIRROR << 8);
 915
 916                 if (open_drain)
 917                         status |= IOCON_ODR | (IOCON_ODR << 8);
 918
 919                 if (type == MCP_TYPE_S18 || type == MCP_TYPE_018)
 920                         status |= IOCON_INTCC | (IOCON_INTCC << 8);
 921
 922                 ret = mcp_write(mcp, MCP_IOCON, status);
 923                 if (ret < 0)
 924                         goto fail;
 925         }
 926
 927         if (mcp->irq && mcp->irq_controller) {
 928                 ret = mcp23s08_irqchip_setup(mcp);
 929                 if (ret)
 930                         goto fail;
 931         }
 932
 933         ret = devm_gpiochip_add_data(dev, &mcp->chip, mcp);
 934         if (ret < 0)
 935                 goto fail;
 936
 937         if (one_regmap_config) {
 938                 mcp->pinctrl_desc.name = devm_kasprintf(dev, GFP_KERNEL,
 939                                 "mcp23xxx-pinctrl.%d", raw_chip_address);
 940                 if (!mcp->pinctrl_desc.name)
 941                         return -ENOMEM;
 942         } else {
 943                 mcp->pinctrl_desc.name = "mcp23xxx-pinctrl";
 944         }
 945         mcp->pinctrl_desc.pctlops = &mcp_pinctrl_ops;
 946         mcp->pinctrl_desc.confops = &mcp_pinconf_ops;
 947         mcp->pinctrl_desc.npins = mcp->chip.ngpio;
 948         if (mcp->pinctrl_desc.npins == 8)
 949                 mcp->pinctrl_desc.pins = mcp23x08_pins;
 950         else if (mcp->pinctrl_desc.npins == 16)
 951                 mcp->pinctrl_desc.pins = mcp23x17_pins;
 952         mcp->pinctrl_desc.owner = THIS_MODULE;
 953
 954         mcp->pctldev = devm_pinctrl_register(dev, &mcp->pinctrl_desc, mcp);
 955         if (IS_ERR(mcp->pctldev)) {
 956                 ret = PTR_ERR(mcp->pctldev);
 957                 goto fail;
 958         }
 959
 960         if (mcp->irq)
 961                 ret = mcp23s08_irq_setup(mcp);
 962
 963 fail:
 964         if (ret < 0)
 965                 dev_dbg(dev, "can't setup chip %d, --> %d\n", addr, ret);
 966         return ret;
 967 }
 968
 969 /*----------------------------------------------------------------------*/
 970
 971 #ifdef CONFIG_OF
 972 #ifdef CONFIG_SPI_MASTER
 973 static const struct of_device_id mcp23s08_spi_of_match[] = {
 974         {
 975                 .compatible = "microchip,mcp23s08",
 976                 .data = (void *) MCP_TYPE_S08,
 977         },
 978         {
 979                 .compatible = "microchip,mcp23s17",
 980                 .data = (void *) MCP_TYPE_S17,
 981         },
 982         {
 983                 .compatible = "microchip,mcp23s18",
 984                 .data = (void *) MCP_TYPE_S18,
 985         },
 986 /* NOTE: The use of the mcp prefix is deprecated and will be removed. */
 987         {
 988                 .compatible = "mcp,mcp23s08",
 989                 .data = (void *) MCP_TYPE_S08,
 990         },
 991         {
 992                 .compatible = "mcp,mcp23s17",
 993                 .data = (void *) MCP_TYPE_S17,
 994         },
 995         { },
 996 };
 997 MODULE_DEVICE_TABLE(of, mcp23s08_spi_of_match);
 998 #endif
 999
1000 #if IS_ENABLED(CONFIG_I2C)
1001 static const struct of_device_id mcp23s08_i2c_of_match[] = {
1002         {
1003                 .compatible = "microchip,mcp23008",
1004                 .data = (void *) MCP_TYPE_008,
1005         },
1006         {
1007                 .compatible = "microchip,mcp23017",
1008                 .data = (void *) MCP_TYPE_017,
1009         },
1010         {
1011                 .compatible = "microchip,mcp23018",
1012                 .data = (void *) MCP_TYPE_018,
1013         },
1014 /* NOTE: The use of the mcp prefix is deprecated and will be removed. */
1015         {
1016                 .compatible = "mcp,mcp23008",
1017                 .data = (void *) MCP_TYPE_008,
1018         },
1019         {
1020                 .compatible = "mcp,mcp23017",
1021                 .data = (void *) MCP_TYPE_017,
1022         },
1023         { },
1024 };
1025 MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
1026 #endif
1027 #endif /* CONFIG_OF */
1028
1029
1030 #if IS_ENABLED(CONFIG_I2C)
1031
1032 static int mcp230xx_probe(struct i2c_client *client,
1033                                     const struct i2c_device_id *id)
1034 {
1035         struct mcp23s08_platform_data *pdata, local_pdata;
1036         struct mcp23s08 *mcp;
1037         int status;
1038
1039         pdata = dev_get_platdata(&client->dev);
1040         if (!pdata) {
1041                 pdata = &local_pdata;
1042                 pdata->base = -1;
1043         }
1044
1045         mcp = devm_kzalloc(&client->dev, sizeof(*mcp), GFP_KERNEL);
1046         if (!mcp)
1047                 return -ENOMEM;
1048
1049         mcp->irq = client->irq;
1050         status = mcp23s08_probe_one(mcp, &client->dev, client, client->addr,
1051                                     id->driver_data, pdata->base, 0);
1052         if (status)
1053                 return status;
1054
1055         i2c_set_clientdata(client, mcp);
1056
1057         return 0;
1058 }
1059
1060 static const struct i2c_device_id mcp230xx_id[] = {
1061         { "mcp23008", MCP_TYPE_008 },
1062         { "mcp23017", MCP_TYPE_017 },
1063         { "mcp23018", MCP_TYPE_018 },
1064         { },
1065 };
1066 MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
1067
1068 static struct i2c_driver mcp230xx_driver = {
1069         .driver = {
1070                 .name   = "mcp230xx",
1071                 .of_match_table = of_match_ptr(mcp23s08_i2c_of_match),
1072         },
1073         .probe          = mcp230xx_probe,
1074         .id_table       = mcp230xx_id,
1075 };
1076
1077 static int __init mcp23s08_i2c_init(void)
1078 {
1079         return i2c_add_driver(&mcp230xx_driver);
1080 }
1081
1082 static void mcp23s08_i2c_exit(void)
1083 {
1084         i2c_del_driver(&mcp230xx_driver);
1085 }
1086
1087 #else
1088
1089 static int __init mcp23s08_i2c_init(void) { return 0; }
1090 static void mcp23s08_i2c_exit(void) { }
1091
1092 #endif /* CONFIG_I2C */
1093
1094 /*----------------------------------------------------------------------*/
1095
1096 #ifdef CONFIG_SPI_MASTER
1097
1098 static int mcp23s08_probe(struct spi_device *spi)
1099 {
1100         struct mcp23s08_platform_data   *pdata, local_pdata;
1101         unsigned                        addr;
1102         int                             chips = 0;
1103         struct mcp23s08_driver_data     *data;
1104         int                             status, type;
1105         unsigned                        ngpio = 0;
1106         const struct                    of_device_id *match;
1107
1108         match = of_match_device(of_match_ptr(mcp23s08_spi_of_match), &spi->dev);
1109         if (match)
1110                 type = (int)(uintptr_t)match->data;
1111         else
1112                 type = spi_get_device_id(spi)->driver_data;
1113
1114         pdata = dev_get_platdata(&spi->dev);
1115         if (!pdata) {
1116                 pdata = &local_pdata;
1117                 pdata->base = -1;
1118
1119                 status = device_property_read_u32(&spi->dev,
1120                         "microchip,spi-present-mask", &pdata->spi_present_mask);
1121                 if (status) {
1122                         status = device_property_read_u32(&spi->dev,
1123                                 "mcp,spi-present-mask",
1124                                 &pdata->spi_present_mask);
1125
1126                         if (status) {
1127                                 dev_err(&spi->dev, "missing spi-present-mask");
1128                                 return -ENODEV;
1129                         }
1130                 }
1131         }
1132
1133         if (!pdata->spi_present_mask || pdata->spi_present_mask > 0xff) {
1134                 dev_err(&spi->dev, "invalid spi-present-mask");
1135                 return -ENODEV;
1136         }
1137
1138         for (addr = 0; addr < MCP_MAX_DEV_PER_CS; addr++) {
1139                 if (pdata->spi_present_mask & BIT(addr))
1140                         chips++;
1141         }
1142
1143         if (!chips)
1144                 return -ENODEV;
1145
1146         data = devm_kzalloc(&spi->dev,
1147                             sizeof(*data) + chips * sizeof(struct mcp23s08),
1148                             GFP_KERNEL);
1149         if (!data)
1150                 return -ENOMEM;
1151
1152         spi_set_drvdata(spi, data);
1153
1154         for (addr = 0; addr < MCP_MAX_DEV_PER_CS; addr++) {
1155                 if (!(pdata->spi_present_mask & BIT(addr)))
1156                         continue;
1157                 chips--;
1158                 data->mcp[addr] = &data->chip[chips];
1159                 data->mcp[addr]->irq = spi->irq;
1160                 status = mcp23s08_probe_one(data->mcp[addr], &spi->dev, spi,
1161                                             0x40 | (addr << 1), type,
1162                                             pdata->base, addr);
1163                 if (status < 0)
1164                         return status;
1165
1166                 if (pdata->base != -1)
1167                         pdata->base += data->mcp[addr]->chip.ngpio;
1168                 ngpio += data->mcp[addr]->chip.ngpio;
1169         }
1170         data->ngpio = ngpio;
1171
1172         return 0;
1173 }
1174
1175 static const struct spi_device_id mcp23s08_ids[] = {
1176         { "mcp23s08", MCP_TYPE_S08 },
1177         { "mcp23s17", MCP_TYPE_S17 },
1178         { "mcp23s18", MCP_TYPE_S18 },
1179         { },
1180 };
1181 MODULE_DEVICE_TABLE(spi, mcp23s08_ids);
1182
1183 static struct spi_driver mcp23s08_driver = {
1184         .probe          = mcp23s08_probe,
1185         .id_table       = mcp23s08_ids,
1186         .driver = {
1187                 .name   = "mcp23s08",
1188                 .of_match_table = of_match_ptr(mcp23s08_spi_of_match),
1189         },
1190 };
1191
1192 static int __init mcp23s08_spi_init(void)
1193 {
1194         return spi_register_driver(&mcp23s08_driver);
1195 }
1196
1197 static void mcp23s08_spi_exit(void)
1198 {
1199         spi_unregister_driver(&mcp23s08_driver);
1200 }
1201
1202 #else
1203
1204 static int __init mcp23s08_spi_init(void) { return 0; }
1205 static void mcp23s08_spi_exit(void) { }
1206
1207 #endif /* CONFIG_SPI_MASTER */
1208
1209 /*----------------------------------------------------------------------*/
1210
1211 static int __init mcp23s08_init(void)
1212 {
1213         int ret;
1214
1215         ret = mcp23s08_spi_init();
1216         if (ret)
1217                 goto spi_fail;
1218
1219         ret = mcp23s08_i2c_init();
1220         if (ret)
1221                 goto i2c_fail;
1222
1223         return 0;
1224
1225  i2c_fail:
1226         mcp23s08_spi_exit();
1227  spi_fail:
1228         return ret;
1229 }
1230 /* register after spi/i2c postcore initcall and before
1231  * subsys initcalls that may rely on these GPIOs
1232  */
1233 subsys_initcall(mcp23s08_init);
1234
1235 static void __exit mcp23s08_exit(void)
1236 {
1237         mcp23s08_spi_exit();
1238         mcp23s08_i2c_exit();
1239 }
1240 module_exit(mcp23s08_exit);
1241
1242 MODULE_LICENSE("GPL");