1 // SPDX-License-Identifier: GPL-2.0-only 2 /* MCP23S08 SPI/I2C GPIO driver */ 3 4 #include <linux/bitops.h> 5 #include <linux/kernel.h> 6 #include <linux/device.h> 7 #include <linux/mutex.h> 8 #include <linux/mod_devicetable.h> 9 #include <linux/module.h> 10 #include <linux/export.h> 11 #include <linux/gpio/driver.h> 12 #include <linux/gpio/consumer.h> 13 #include <linux/seq_file.h> 14 #include <linux/slab.h> 15 #include <asm/byteorder.h> 16 #include <linux/interrupt.h> 17 #include <linux/regmap.h> 18 #include <linux/pinctrl/pinctrl.h> 19 #include <linux/pinctrl/pinconf.h> 20 #include <linux/pinctrl/pinconf-generic.h> 21 22 #include "pinctrl-mcp23s08.h" 23 24 /* Registers are all 8 bits wide. 25 * 26 * The mcp23s17 has twice as many bits, and can be configured to work 27 * with either 16 bit registers or with two adjacent 8 bit banks. 28 */ 29 #define MCP_IODIR 0x00 /* init/reset: all ones */ 30 #define MCP_IPOL 0x01 31 #define MCP_GPINTEN 0x02 32 #define MCP_DEFVAL 0x03 33 #define MCP_INTCON 0x04 34 #define MCP_IOCON 0x05 35 # define IOCON_MIRROR (1 << 6) 36 # define IOCON_SEQOP (1 << 5) 37 # define IOCON_HAEN (1 << 3) 38 # define IOCON_ODR (1 << 2) 39 # define IOCON_INTPOL (1 << 1) 40 # define IOCON_INTCC (1) 41 #define MCP_GPPU 0x06 42 #define MCP_INTF 0x07 43 #define MCP_INTCAP 0x08 44 #define MCP_GPIO 0x09 45 #define MCP_OLAT 0x0a 46 47 static const struct reg_default mcp23x08_defaults[] = { 48 {.reg = MCP_IODIR, .def = 0xff}, 49 {.reg = MCP_IPOL, .def = 0x00}, 50 {.reg = MCP_GPINTEN, .def = 0x00}, 51 {.reg = MCP_DEFVAL, .def = 0x00}, 52 {.reg = MCP_INTCON, .def = 0x00}, 53 {.reg = MCP_IOCON, .def = 0x00}, 54 {.reg = MCP_GPPU, .def = 0x00}, 55 {.reg = MCP_OLAT, .def = 0x00}, 56 }; 57 58 static const struct regmap_range mcp23x08_volatile_range = { 59 .range_min = MCP_INTF, 60 .range_max = MCP_GPIO, 61 }; 62 63 static const struct regmap_access_table mcp23x08_volatile_table = { 64 .yes_ranges = &mcp23x08_volatile_range, 65 .n_yes_ranges = 1, 66 }; 67 68 static const struct regmap_range mcp23x08_precious_range = { 69 .range_min = MCP_GPIO, 70 .range_max = MCP_GPIO, 71 }; 72 73 static const struct regmap_access_table mcp23x08_precious_table = { 74 .yes_ranges = &mcp23x08_precious_range, 75 .n_yes_ranges = 1, 76 }; 77 78 const struct regmap_config mcp23x08_regmap = { 79 .reg_bits = 8, 80 .val_bits = 8, 81 82 .reg_stride = 1, 83 .volatile_table = &mcp23x08_volatile_table, 84 .precious_table = &mcp23x08_precious_table, 85 .reg_defaults = mcp23x08_defaults, 86 .num_reg_defaults = ARRAY_SIZE(mcp23x08_defaults), 87 .cache_type = REGCACHE_FLAT, 88 .max_register = MCP_OLAT, 89 }; 90 EXPORT_SYMBOL_GPL(mcp23x08_regmap); 91 92 static const struct reg_default mcp23x17_defaults[] = { 93 {.reg = MCP_IODIR << 1, .def = 0xffff}, 94 {.reg = MCP_IPOL << 1, .def = 0x0000}, 95 {.reg = MCP_GPINTEN << 1, .def = 0x0000}, 96 {.reg = MCP_DEFVAL << 1, .def = 0x0000}, 97 {.reg = MCP_INTCON << 1, .def = 0x0000}, 98 {.reg = MCP_IOCON << 1, .def = 0x0000}, 99 {.reg = MCP_GPPU << 1, .def = 0x0000}, 100 {.reg = MCP_OLAT << 1, .def = 0x0000}, 101 }; 102 103 static const struct regmap_range mcp23x17_volatile_range = { 104 .range_min = MCP_INTF << 1, 105 .range_max = MCP_GPIO << 1, 106 }; 107 108 static const struct regmap_access_table mcp23x17_volatile_table = { 109 .yes_ranges = &mcp23x17_volatile_range, 110 .n_yes_ranges = 1, 111 }; 112 113 static const struct regmap_range mcp23x17_precious_range = { 114 .range_min = MCP_INTCAP << 1, 115 .range_max = MCP_GPIO << 1, 116 }; 117 118 static const struct regmap_access_table mcp23x17_precious_table = { 119 .yes_ranges = &mcp23x17_precious_range, 120 .n_yes_ranges = 1, 121 }; 122 123 const struct regmap_config mcp23x17_regmap = { 124 .reg_bits = 8, 125 .val_bits = 16, 126 127 .reg_stride = 2, 128 .max_register = MCP_OLAT << 1, 129 .volatile_table = &mcp23x17_volatile_table, 130 .precious_table = &mcp23x17_precious_table, 131 .reg_defaults = mcp23x17_defaults, 132 .num_reg_defaults = ARRAY_SIZE(mcp23x17_defaults), 133 .cache_type = REGCACHE_FLAT, 134 .val_format_endian = REGMAP_ENDIAN_LITTLE, 135 }; 136 EXPORT_SYMBOL_GPL(mcp23x17_regmap); 137 138 static int mcp_read(struct mcp23s08 *mcp, unsigned int reg, unsigned int *val) 139 { 140 return regmap_read(mcp->regmap, reg << mcp->reg_shift, val); 141 } 142 143 static int mcp_write(struct mcp23s08 *mcp, unsigned int reg, unsigned int val) 144 { 145 return regmap_write(mcp->regmap, reg << mcp->reg_shift, val); 146 } 147 148 static int mcp_update_bits(struct mcp23s08 *mcp, unsigned int reg, 149 unsigned int mask, unsigned int val) 150 { 151 return regmap_update_bits(mcp->regmap, reg << mcp->reg_shift, 152 mask, val); 153 } 154 155 static int mcp_set_bit(struct mcp23s08 *mcp, unsigned int reg, 156 unsigned int pin, bool enabled) 157 { 158 u16 mask = BIT(pin); 159 return mcp_update_bits(mcp, reg, mask, enabled ? mask : 0); 160 } 161 162 static const struct pinctrl_pin_desc mcp23x08_pins[] = { 163 PINCTRL_PIN(0, "gpio0"), 164 PINCTRL_PIN(1, "gpio1"), 165 PINCTRL_PIN(2, "gpio2"), 166 PINCTRL_PIN(3, "gpio3"), 167 PINCTRL_PIN(4, "gpio4"), 168 PINCTRL_PIN(5, "gpio5"), 169 PINCTRL_PIN(6, "gpio6"), 170 PINCTRL_PIN(7, "gpio7"), 171 }; 172 173 static const struct pinctrl_pin_desc mcp23x17_pins[] = { 174 PINCTRL_PIN(0, "gpio0"), 175 PINCTRL_PIN(1, "gpio1"), 176 PINCTRL_PIN(2, "gpio2"), 177 PINCTRL_PIN(3, "gpio3"), 178 PINCTRL_PIN(4, "gpio4"), 179 PINCTRL_PIN(5, "gpio5"), 180 PINCTRL_PIN(6, "gpio6"), 181 PINCTRL_PIN(7, "gpio7"), 182 PINCTRL_PIN(8, "gpio8"), 183 PINCTRL_PIN(9, "gpio9"), 184 PINCTRL_PIN(10, "gpio10"), 185 PINCTRL_PIN(11, "gpio11"), 186 PINCTRL_PIN(12, "gpio12"), 187 PINCTRL_PIN(13, "gpio13"), 188 PINCTRL_PIN(14, "gpio14"), 189 PINCTRL_PIN(15, "gpio15"), 190 }; 191 192 static int mcp_pinctrl_get_groups_count(struct pinctrl_dev *pctldev) 193 { 194 return 0; 195 } 196 197 static const char *mcp_pinctrl_get_group_name(struct pinctrl_dev *pctldev, 198 unsigned int group) 199 { 200 return NULL; 201 } 202 203 static int mcp_pinctrl_get_group_pins(struct pinctrl_dev *pctldev, 204 unsigned int group, 205 const unsigned int **pins, 206 unsigned int *num_pins) 207 { 208 return -ENOTSUPP; 209 } 210 211 static const struct pinctrl_ops mcp_pinctrl_ops = { 212 .get_groups_count = mcp_pinctrl_get_groups_count, 213 .get_group_name = mcp_pinctrl_get_group_name, 214 .get_group_pins = mcp_pinctrl_get_group_pins, 215 #ifdef CONFIG_OF 216 .dt_node_to_map = pinconf_generic_dt_node_to_map_pin, 217 .dt_free_map = pinconf_generic_dt_free_map, 218 #endif 219 }; 220 221 static int mcp_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin, 222 unsigned long *config) 223 { 224 struct mcp23s08 *mcp = pinctrl_dev_get_drvdata(pctldev); 225 enum pin_config_param param = pinconf_to_config_param(*config); 226 unsigned int data, status; 227 int ret; 228 229 switch (param) { 230 case PIN_CONFIG_BIAS_PULL_UP: 231 ret = mcp_read(mcp, MCP_GPPU, &data); 232 if (ret < 0) 233 return ret; 234 status = (data & BIT(pin)) ? 1 : 0; 235 break; 236 default: 237 return -ENOTSUPP; 238 } 239 240 *config = 0; 241 242 return status ? 0 : -EINVAL; 243 } 244 245 static int mcp_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin, 246 unsigned long *configs, unsigned int num_configs) 247 { 248 struct mcp23s08 *mcp = pinctrl_dev_get_drvdata(pctldev); 249 enum pin_config_param param; 250 u32 arg; 251 int ret = 0; 252 int i; 253 254 for (i = 0; i < num_configs; i++) { 255 param = pinconf_to_config_param(configs[i]); 256 arg = pinconf_to_config_argument(configs[i]); 257 258 switch (param) { 259 case PIN_CONFIG_BIAS_PULL_UP: 260 ret = mcp_set_bit(mcp, MCP_GPPU, pin, arg); 261 break; 262 default: 263 dev_dbg(mcp->dev, "Invalid config param %04x\n", param); 264 return -ENOTSUPP; 265 } 266 } 267 268 return ret; 269 } 270 271 static const struct pinconf_ops mcp_pinconf_ops = { 272 .pin_config_get = mcp_pinconf_get, 273 .pin_config_set = mcp_pinconf_set, 274 .is_generic = true, 275 }; 276 277 /*----------------------------------------------------------------------*/ 278 279 static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset) 280 { 281 struct mcp23s08 *mcp = gpiochip_get_data(chip); 282 int status; 283 284 mutex_lock(&mcp->lock); 285 status = mcp_set_bit(mcp, MCP_IODIR, offset, true); 286 mutex_unlock(&mcp->lock); 287 288 return status; 289 } 290 291 static int mcp23s08_get(struct gpio_chip *chip, unsigned offset) 292 { 293 struct mcp23s08 *mcp = gpiochip_get_data(chip); 294 int status, ret; 295 296 mutex_lock(&mcp->lock); 297 298 /* REVISIT reading this clears any IRQ ... */ 299 ret = mcp_read(mcp, MCP_GPIO, &status); 300 if (ret < 0) 301 status = 0; 302 else { 303 mcp->cached_gpio = status; 304 status = !!(status & (1 << offset)); 305 } 306 307 mutex_unlock(&mcp->lock); 308 return status; 309 } 310 311 static int mcp23s08_get_multiple(struct gpio_chip *chip, 312 unsigned long *mask, unsigned long *bits) 313 { 314 struct mcp23s08 *mcp = gpiochip_get_data(chip); 315 unsigned int status; 316 int ret; 317 318 mutex_lock(&mcp->lock); 319 320 /* REVISIT reading this clears any IRQ ... */ 321 ret = mcp_read(mcp, MCP_GPIO, &status); 322 if (ret < 0) 323 status = 0; 324 else { 325 mcp->cached_gpio = status; 326 *bits = status; 327 } 328 329 mutex_unlock(&mcp->lock); 330 return ret; 331 } 332 333 static int __mcp23s08_set(struct mcp23s08 *mcp, unsigned mask, bool value) 334 { 335 return mcp_update_bits(mcp, MCP_OLAT, mask, value ? mask : 0); 336 } 337 338 static void mcp23s08_set(struct gpio_chip *chip, unsigned offset, int value) 339 { 340 struct mcp23s08 *mcp = gpiochip_get_data(chip); 341 unsigned mask = BIT(offset); 342 343 mutex_lock(&mcp->lock); 344 __mcp23s08_set(mcp, mask, !!value); 345 mutex_unlock(&mcp->lock); 346 } 347 348 static void mcp23s08_set_multiple(struct gpio_chip *chip, 349 unsigned long *mask, unsigned long *bits) 350 { 351 struct mcp23s08 *mcp = gpiochip_get_data(chip); 352 353 mutex_lock(&mcp->lock); 354 mcp_update_bits(mcp, MCP_OLAT, *mask, *bits); 355 mutex_unlock(&mcp->lock); 356 } 357 358 static int 359 mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value) 360 { 361 struct mcp23s08 *mcp = gpiochip_get_data(chip); 362 unsigned mask = BIT(offset); 363 int status; 364 365 mutex_lock(&mcp->lock); 366 status = __mcp23s08_set(mcp, mask, value); 367 if (status == 0) { 368 status = mcp_update_bits(mcp, MCP_IODIR, mask, 0); 369 } 370 mutex_unlock(&mcp->lock); 371 return status; 372 } 373 374 /*----------------------------------------------------------------------*/ 375 static irqreturn_t mcp23s08_irq(int irq, void *data) 376 { 377 struct mcp23s08 *mcp = data; 378 int intcap, intcon, intf, i, gpio, gpio_orig, intcap_mask, defval, gpinten; 379 unsigned long int enabled_interrupts; 380 unsigned int child_irq; 381 bool intf_set, intcap_changed, gpio_bit_changed, 382 defval_changed, gpio_set; 383 384 mutex_lock(&mcp->lock); 385 if (mcp_read(mcp, MCP_INTF, &intf)) 386 goto unlock; 387 388 if (intf == 0) { 389 /* There is no interrupt pending */ 390 goto unlock; 391 } 392 393 if (mcp_read(mcp, MCP_INTCAP, &intcap)) 394 goto unlock; 395 396 if (mcp_read(mcp, MCP_INTCON, &intcon)) 397 goto unlock; 398 399 if (mcp_read(mcp, MCP_GPINTEN, &gpinten)) 400 goto unlock; 401 402 if (mcp_read(mcp, MCP_DEFVAL, &defval)) 403 goto unlock; 404 405 /* This clears the interrupt(configurable on S18) */ 406 if (mcp_read(mcp, MCP_GPIO, &gpio)) 407 goto unlock; 408 409 gpio_orig = mcp->cached_gpio; 410 mcp->cached_gpio = gpio; 411 mutex_unlock(&mcp->lock); 412 413 dev_dbg(mcp->chip.parent, 414 "intcap 0x%04X intf 0x%04X gpio_orig 0x%04X gpio 0x%04X\n", 415 intcap, intf, gpio_orig, gpio); 416 417 enabled_interrupts = gpinten; 418 for_each_set_bit(i, &enabled_interrupts, mcp->chip.ngpio) { 419 /* 420 * We must check all of the inputs with enabled interrupts 421 * on the chip, otherwise we may not notice a change 422 * on more than one pin. 423 * 424 * On at least the mcp23s17, INTCAP is only updated 425 * one byte at a time(INTCAPA and INTCAPB are 426 * not written to at the same time - only on a per-bank 427 * basis). 428 * 429 * INTF only contains the single bit that caused the 430 * interrupt per-bank. On the mcp23s17, there is 431 * INTFA and INTFB. If two pins are changed on the A 432 * side at the same time, INTF will only have one bit 433 * set. If one pin on the A side and one pin on the B 434 * side are changed at the same time, INTF will have 435 * two bits set. Thus, INTF can't be the only check 436 * to see if the input has changed. 437 */ 438 439 intf_set = intf & BIT(i); 440 if (i < 8 && intf_set) 441 intcap_mask = 0x00FF; 442 else if (i >= 8 && intf_set) 443 intcap_mask = 0xFF00; 444 else 445 intcap_mask = 0x00; 446 447 intcap_changed = (intcap_mask & 448 (intcap & BIT(i))) != 449 (intcap_mask & (BIT(i) & gpio_orig)); 450 gpio_set = BIT(i) & gpio; 451 gpio_bit_changed = (BIT(i) & gpio_orig) != 452 (BIT(i) & gpio); 453 defval_changed = (BIT(i) & intcon) && 454 ((BIT(i) & gpio) != 455 (BIT(i) & defval)); 456 457 if (((gpio_bit_changed || intcap_changed) && 458 (BIT(i) & mcp->irq_rise) && gpio_set) || 459 ((gpio_bit_changed || intcap_changed) && 460 (BIT(i) & mcp->irq_fall) && !gpio_set) || 461 defval_changed) { 462 child_irq = irq_find_mapping(mcp->chip.irq.domain, i); 463 handle_nested_irq(child_irq); 464 } 465 } 466 467 return IRQ_HANDLED; 468 469 unlock: 470 mutex_unlock(&mcp->lock); 471 return IRQ_HANDLED; 472 } 473 474 static void mcp23s08_irq_mask(struct irq_data *data) 475 { 476 struct gpio_chip *gc = irq_data_get_irq_chip_data(data); 477 struct mcp23s08 *mcp = gpiochip_get_data(gc); 478 unsigned int pos = irqd_to_hwirq(data); 479 480 mcp_set_bit(mcp, MCP_GPINTEN, pos, false); 481 gpiochip_disable_irq(gc, pos); 482 } 483 484 static void mcp23s08_irq_unmask(struct irq_data *data) 485 { 486 struct gpio_chip *gc = irq_data_get_irq_chip_data(data); 487 struct mcp23s08 *mcp = gpiochip_get_data(gc); 488 unsigned int pos = irqd_to_hwirq(data); 489 490 gpiochip_enable_irq(gc, pos); 491 mcp_set_bit(mcp, MCP_GPINTEN, pos, true); 492 } 493 494 static int mcp23s08_irq_set_type(struct irq_data *data, unsigned int type) 495 { 496 struct gpio_chip *gc = irq_data_get_irq_chip_data(data); 497 struct mcp23s08 *mcp = gpiochip_get_data(gc); 498 unsigned int pos = irqd_to_hwirq(data); 499 500 if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) { 501 mcp_set_bit(mcp, MCP_INTCON, pos, false); 502 mcp->irq_rise |= BIT(pos); 503 mcp->irq_fall |= BIT(pos); 504 } else if (type & IRQ_TYPE_EDGE_RISING) { 505 mcp_set_bit(mcp, MCP_INTCON, pos, false); 506 mcp->irq_rise |= BIT(pos); 507 mcp->irq_fall &= ~BIT(pos); 508 } else if (type & IRQ_TYPE_EDGE_FALLING) { 509 mcp_set_bit(mcp, MCP_INTCON, pos, false); 510 mcp->irq_rise &= ~BIT(pos); 511 mcp->irq_fall |= BIT(pos); 512 } else if (type & IRQ_TYPE_LEVEL_HIGH) { 513 mcp_set_bit(mcp, MCP_INTCON, pos, true); 514 mcp_set_bit(mcp, MCP_DEFVAL, pos, false); 515 } else if (type & IRQ_TYPE_LEVEL_LOW) { 516 mcp_set_bit(mcp, MCP_INTCON, pos, true); 517 mcp_set_bit(mcp, MCP_DEFVAL, pos, true); 518 } else 519 return -EINVAL; 520 521 return 0; 522 } 523 524 static void mcp23s08_irq_bus_lock(struct irq_data *data) 525 { 526 struct gpio_chip *gc = irq_data_get_irq_chip_data(data); 527 struct mcp23s08 *mcp = gpiochip_get_data(gc); 528 529 mutex_lock(&mcp->lock); 530 regcache_cache_only(mcp->regmap, true); 531 } 532 533 static void mcp23s08_irq_bus_unlock(struct irq_data *data) 534 { 535 struct gpio_chip *gc = irq_data_get_irq_chip_data(data); 536 struct mcp23s08 *mcp = gpiochip_get_data(gc); 537 538 regcache_cache_only(mcp->regmap, false); 539 regcache_sync(mcp->regmap); 540 541 mutex_unlock(&mcp->lock); 542 } 543 544 static int mcp23s08_irq_setup(struct mcp23s08 *mcp) 545 { 546 struct gpio_chip *chip = &mcp->chip; 547 int err; 548 unsigned long irqflags = IRQF_ONESHOT | IRQF_SHARED; 549 550 if (mcp->irq_active_high) 551 irqflags |= IRQF_TRIGGER_HIGH; 552 else 553 irqflags |= IRQF_TRIGGER_LOW; 554 555 err = devm_request_threaded_irq(chip->parent, mcp->irq, NULL, 556 mcp23s08_irq, 557 irqflags, dev_name(chip->parent), mcp); 558 if (err != 0) { 559 dev_err(chip->parent, "unable to request IRQ#%d: %d\n", 560 mcp->irq, err); 561 return err; 562 } 563 564 return 0; 565 } 566 567 static void mcp23s08_irq_print_chip(struct irq_data *d, struct seq_file *p) 568 { 569 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 570 struct mcp23s08 *mcp = gpiochip_get_data(gc); 571 572 seq_printf(p, dev_name(mcp->dev)); 573 } 574 575 static const struct irq_chip mcp23s08_irq_chip = { 576 .irq_mask = mcp23s08_irq_mask, 577 .irq_unmask = mcp23s08_irq_unmask, 578 .irq_set_type = mcp23s08_irq_set_type, 579 .irq_bus_lock = mcp23s08_irq_bus_lock, 580 .irq_bus_sync_unlock = mcp23s08_irq_bus_unlock, 581 .irq_print_chip = mcp23s08_irq_print_chip, 582 .flags = IRQCHIP_IMMUTABLE, 583 GPIOCHIP_IRQ_RESOURCE_HELPERS, 584 }; 585 586 /*----------------------------------------------------------------------*/ 587 588 int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev, 589 unsigned int addr, unsigned int type, unsigned int base) 590 { 591 int status, ret; 592 bool mirror = false; 593 bool open_drain = false; 594 595 mutex_init(&mcp->lock); 596 597 mcp->dev = dev; 598 mcp->addr = addr; 599 600 mcp->irq_active_high = false; 601 602 mcp->chip.direction_input = mcp23s08_direction_input; 603 mcp->chip.get = mcp23s08_get; 604 mcp->chip.get_multiple = mcp23s08_get_multiple; 605 mcp->chip.direction_output = mcp23s08_direction_output; 606 mcp->chip.set = mcp23s08_set; 607 mcp->chip.set_multiple = mcp23s08_set_multiple; 608 609 mcp->chip.base = base; 610 mcp->chip.can_sleep = true; 611 mcp->chip.parent = dev; 612 mcp->chip.owner = THIS_MODULE; 613 614 mcp->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); 615 616 /* verify MCP_IOCON.SEQOP = 0, so sequential reads work, 617 * and MCP_IOCON.HAEN = 1, so we work with all chips. 618 */ 619 620 ret = mcp_read(mcp, MCP_IOCON, &status); 621 if (ret < 0) 622 return dev_err_probe(dev, ret, "can't identify chip %d\n", addr); 623 624 mcp->irq_controller = 625 device_property_read_bool(dev, "interrupt-controller"); 626 if (mcp->irq && mcp->irq_controller) { 627 mcp->irq_active_high = 628 device_property_read_bool(dev, 629 "microchip,irq-active-high"); 630 631 mirror = device_property_read_bool(dev, "microchip,irq-mirror"); 632 open_drain = device_property_read_bool(dev, "drive-open-drain"); 633 } 634 635 if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN) || mirror || 636 mcp->irq_active_high || open_drain) { 637 /* mcp23s17 has IOCON twice, make sure they are in sync */ 638 status &= ~(IOCON_SEQOP | (IOCON_SEQOP << 8)); 639 status |= IOCON_HAEN | (IOCON_HAEN << 8); 640 if (mcp->irq_active_high) 641 status |= IOCON_INTPOL | (IOCON_INTPOL << 8); 642 else 643 status &= ~(IOCON_INTPOL | (IOCON_INTPOL << 8)); 644 645 if (mirror) 646 status |= IOCON_MIRROR | (IOCON_MIRROR << 8); 647 648 if (open_drain) 649 status |= IOCON_ODR | (IOCON_ODR << 8); 650 651 if (type == MCP_TYPE_S18 || type == MCP_TYPE_018) 652 status |= IOCON_INTCC | (IOCON_INTCC << 8); 653 654 ret = mcp_write(mcp, MCP_IOCON, status); 655 if (ret < 0) 656 return dev_err_probe(dev, ret, "can't write IOCON %d\n", addr); 657 } 658 659 if (mcp->irq && mcp->irq_controller) { 660 struct gpio_irq_chip *girq = &mcp->chip.irq; 661 662 gpio_irq_chip_set_chip(girq, &mcp23s08_irq_chip); 663 /* This will let us handle the parent IRQ in the driver */ 664 girq->parent_handler = NULL; 665 girq->num_parents = 0; 666 girq->parents = NULL; 667 girq->default_type = IRQ_TYPE_NONE; 668 girq->handler = handle_simple_irq; 669 girq->threaded = true; 670 } 671 672 ret = devm_gpiochip_add_data(dev, &mcp->chip, mcp); 673 if (ret < 0) 674 return dev_err_probe(dev, ret, "can't add GPIO chip\n"); 675 676 mcp->pinctrl_desc.pctlops = &mcp_pinctrl_ops; 677 mcp->pinctrl_desc.confops = &mcp_pinconf_ops; 678 mcp->pinctrl_desc.npins = mcp->chip.ngpio; 679 if (mcp->pinctrl_desc.npins == 8) 680 mcp->pinctrl_desc.pins = mcp23x08_pins; 681 else if (mcp->pinctrl_desc.npins == 16) 682 mcp->pinctrl_desc.pins = mcp23x17_pins; 683 mcp->pinctrl_desc.owner = THIS_MODULE; 684 685 mcp->pctldev = devm_pinctrl_register(dev, &mcp->pinctrl_desc, mcp); 686 if (IS_ERR(mcp->pctldev)) 687 return dev_err_probe(dev, PTR_ERR(mcp->pctldev), "can't register controller\n"); 688 689 if (mcp->irq) { 690 ret = mcp23s08_irq_setup(mcp); 691 if (ret) 692 return dev_err_probe(dev, ret, "can't setup IRQ\n"); 693 } 694 695 return 0; 696 } 697 EXPORT_SYMBOL_GPL(mcp23s08_probe_one); 698 699 MODULE_LICENSE("GPL"); 700