1 /* 2 * PCA953x 4/8/16 bit I/O ports 3 * 4 * Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com> 5 * Copyright (C) 2007 Marvell International Ltd. 6 * 7 * Derived from drivers/i2c/chips/pca9539.c 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; version 2 of the License. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/init.h> 16 #include <linux/gpio.h> 17 #include <linux/interrupt.h> 18 #include <linux/irq.h> 19 #include <linux/irqdomain.h> 20 #include <linux/i2c.h> 21 #include <linux/i2c/pca953x.h> 22 #include <linux/slab.h> 23 #ifdef CONFIG_OF_GPIO 24 #include <linux/of_platform.h> 25 #endif 26 27 #define PCA953X_INPUT 0 28 #define PCA953X_OUTPUT 1 29 #define PCA953X_INVERT 2 30 #define PCA953X_DIRECTION 3 31 32 #define REG_ADDR_AI 0x80 33 34 #define PCA957X_IN 0 35 #define PCA957X_INVRT 1 36 #define PCA957X_BKEN 2 37 #define PCA957X_PUPD 3 38 #define PCA957X_CFG 4 39 #define PCA957X_OUT 5 40 #define PCA957X_MSK 6 41 #define PCA957X_INTS 7 42 43 #define PCA_GPIO_MASK 0x00FF 44 #define PCA_INT 0x0100 45 #define PCA953X_TYPE 0x1000 46 #define PCA957X_TYPE 0x2000 47 48 static const struct i2c_device_id pca953x_id[] = { 49 { "pca9505", 40 | PCA953X_TYPE | PCA_INT, }, 50 { "pca9534", 8 | PCA953X_TYPE | PCA_INT, }, 51 { "pca9535", 16 | PCA953X_TYPE | PCA_INT, }, 52 { "pca9536", 4 | PCA953X_TYPE, }, 53 { "pca9537", 4 | PCA953X_TYPE | PCA_INT, }, 54 { "pca9538", 8 | PCA953X_TYPE | PCA_INT, }, 55 { "pca9539", 16 | PCA953X_TYPE | PCA_INT, }, 56 { "pca9554", 8 | PCA953X_TYPE | PCA_INT, }, 57 { "pca9555", 16 | PCA953X_TYPE | PCA_INT, }, 58 { "pca9556", 8 | PCA953X_TYPE, }, 59 { "pca9557", 8 | PCA953X_TYPE, }, 60 { "pca9574", 8 | PCA957X_TYPE | PCA_INT, }, 61 { "pca9575", 16 | PCA957X_TYPE | PCA_INT, }, 62 63 { "max7310", 8 | PCA953X_TYPE, }, 64 { "max7312", 16 | PCA953X_TYPE | PCA_INT, }, 65 { "max7313", 16 | PCA953X_TYPE | PCA_INT, }, 66 { "max7315", 8 | PCA953X_TYPE | PCA_INT, }, 67 { "pca6107", 8 | PCA953X_TYPE | PCA_INT, }, 68 { "tca6408", 8 | PCA953X_TYPE | PCA_INT, }, 69 { "tca6416", 16 | PCA953X_TYPE | PCA_INT, }, 70 { "tca6424", 24 | PCA953X_TYPE | PCA_INT, }, 71 { } 72 }; 73 MODULE_DEVICE_TABLE(i2c, pca953x_id); 74 75 #define MAX_BANK 5 76 #define BANK_SZ 8 77 78 #define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ) 79 80 struct pca953x_chip { 81 unsigned gpio_start; 82 u8 reg_output[MAX_BANK]; 83 u8 reg_direction[MAX_BANK]; 84 struct mutex i2c_lock; 85 86 #ifdef CONFIG_GPIO_PCA953X_IRQ 87 struct mutex irq_lock; 88 u8 irq_mask[MAX_BANK]; 89 u8 irq_stat[MAX_BANK]; 90 u8 irq_trig_raise[MAX_BANK]; 91 u8 irq_trig_fall[MAX_BANK]; 92 struct irq_domain *domain; 93 #endif 94 95 struct i2c_client *client; 96 struct gpio_chip gpio_chip; 97 const char *const *names; 98 int chip_type; 99 }; 100 101 static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val, 102 int off) 103 { 104 int ret; 105 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ); 106 int offset = off / BANK_SZ; 107 108 ret = i2c_smbus_read_byte_data(chip->client, 109 (reg << bank_shift) + offset); 110 *val = ret; 111 112 if (ret < 0) { 113 dev_err(&chip->client->dev, "failed reading register\n"); 114 return ret; 115 } 116 117 return 0; 118 } 119 120 static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val, 121 int off) 122 { 123 int ret = 0; 124 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ); 125 int offset = off / BANK_SZ; 126 127 ret = i2c_smbus_write_byte_data(chip->client, 128 (reg << bank_shift) + offset, val); 129 130 if (ret < 0) { 131 dev_err(&chip->client->dev, "failed writing register\n"); 132 return ret; 133 } 134 135 return 0; 136 } 137 138 static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val) 139 { 140 int ret = 0; 141 142 if (chip->gpio_chip.ngpio <= 8) 143 ret = i2c_smbus_write_byte_data(chip->client, reg, *val); 144 else if (chip->gpio_chip.ngpio >= 24) { 145 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ); 146 ret = i2c_smbus_write_i2c_block_data(chip->client, 147 (reg << bank_shift) | REG_ADDR_AI, 148 NBANK(chip), val); 149 } else { 150 switch (chip->chip_type) { 151 case PCA953X_TYPE: 152 ret = i2c_smbus_write_word_data(chip->client, 153 reg << 1, (u16) *val); 154 break; 155 case PCA957X_TYPE: 156 ret = i2c_smbus_write_byte_data(chip->client, reg << 1, 157 val[0]); 158 if (ret < 0) 159 break; 160 ret = i2c_smbus_write_byte_data(chip->client, 161 (reg << 1) + 1, 162 val[1]); 163 break; 164 } 165 } 166 167 if (ret < 0) { 168 dev_err(&chip->client->dev, "failed writing register\n"); 169 return ret; 170 } 171 172 return 0; 173 } 174 175 static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val) 176 { 177 int ret; 178 179 if (chip->gpio_chip.ngpio <= 8) { 180 ret = i2c_smbus_read_byte_data(chip->client, reg); 181 *val = ret; 182 } else if (chip->gpio_chip.ngpio >= 24) { 183 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ); 184 185 ret = i2c_smbus_read_i2c_block_data(chip->client, 186 (reg << bank_shift) | REG_ADDR_AI, 187 NBANK(chip), val); 188 } else { 189 ret = i2c_smbus_read_word_data(chip->client, reg << 1); 190 val[0] = (u16)ret & 0xFF; 191 val[1] = (u16)ret >> 8; 192 } 193 if (ret < 0) { 194 dev_err(&chip->client->dev, "failed reading register\n"); 195 return ret; 196 } 197 198 return 0; 199 } 200 201 static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off) 202 { 203 struct pca953x_chip *chip; 204 u8 reg_val; 205 int ret, offset = 0; 206 207 chip = container_of(gc, struct pca953x_chip, gpio_chip); 208 209 mutex_lock(&chip->i2c_lock); 210 reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ)); 211 212 switch (chip->chip_type) { 213 case PCA953X_TYPE: 214 offset = PCA953X_DIRECTION; 215 break; 216 case PCA957X_TYPE: 217 offset = PCA957X_CFG; 218 break; 219 } 220 ret = pca953x_write_single(chip, offset, reg_val, off); 221 if (ret) 222 goto exit; 223 224 chip->reg_direction[off / BANK_SZ] = reg_val; 225 ret = 0; 226 exit: 227 mutex_unlock(&chip->i2c_lock); 228 return ret; 229 } 230 231 static int pca953x_gpio_direction_output(struct gpio_chip *gc, 232 unsigned off, int val) 233 { 234 struct pca953x_chip *chip; 235 u8 reg_val; 236 int ret, offset = 0; 237 238 chip = container_of(gc, struct pca953x_chip, gpio_chip); 239 240 mutex_lock(&chip->i2c_lock); 241 /* set output level */ 242 if (val) 243 reg_val = chip->reg_output[off / BANK_SZ] 244 | (1u << (off % BANK_SZ)); 245 else 246 reg_val = chip->reg_output[off / BANK_SZ] 247 & ~(1u << (off % BANK_SZ)); 248 249 switch (chip->chip_type) { 250 case PCA953X_TYPE: 251 offset = PCA953X_OUTPUT; 252 break; 253 case PCA957X_TYPE: 254 offset = PCA957X_OUT; 255 break; 256 } 257 ret = pca953x_write_single(chip, offset, reg_val, off); 258 if (ret) 259 goto exit; 260 261 chip->reg_output[off / BANK_SZ] = reg_val; 262 263 /* then direction */ 264 reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ)); 265 switch (chip->chip_type) { 266 case PCA953X_TYPE: 267 offset = PCA953X_DIRECTION; 268 break; 269 case PCA957X_TYPE: 270 offset = PCA957X_CFG; 271 break; 272 } 273 ret = pca953x_write_single(chip, offset, reg_val, off); 274 if (ret) 275 goto exit; 276 277 chip->reg_direction[off / BANK_SZ] = reg_val; 278 ret = 0; 279 exit: 280 mutex_unlock(&chip->i2c_lock); 281 return ret; 282 } 283 284 static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off) 285 { 286 struct pca953x_chip *chip; 287 u32 reg_val; 288 int ret, offset = 0; 289 290 chip = container_of(gc, struct pca953x_chip, gpio_chip); 291 292 mutex_lock(&chip->i2c_lock); 293 switch (chip->chip_type) { 294 case PCA953X_TYPE: 295 offset = PCA953X_INPUT; 296 break; 297 case PCA957X_TYPE: 298 offset = PCA957X_IN; 299 break; 300 } 301 ret = pca953x_read_single(chip, offset, ®_val, off); 302 mutex_unlock(&chip->i2c_lock); 303 if (ret < 0) { 304 /* NOTE: diagnostic already emitted; that's all we should 305 * do unless gpio_*_value_cansleep() calls become different 306 * from their nonsleeping siblings (and report faults). 307 */ 308 return 0; 309 } 310 311 return (reg_val & (1u << off)) ? 1 : 0; 312 } 313 314 static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val) 315 { 316 struct pca953x_chip *chip; 317 u8 reg_val; 318 int ret, offset = 0; 319 320 chip = container_of(gc, struct pca953x_chip, gpio_chip); 321 322 mutex_lock(&chip->i2c_lock); 323 if (val) 324 reg_val = chip->reg_output[off / BANK_SZ] 325 | (1u << (off % BANK_SZ)); 326 else 327 reg_val = chip->reg_output[off / BANK_SZ] 328 & ~(1u << (off % BANK_SZ)); 329 330 switch (chip->chip_type) { 331 case PCA953X_TYPE: 332 offset = PCA953X_OUTPUT; 333 break; 334 case PCA957X_TYPE: 335 offset = PCA957X_OUT; 336 break; 337 } 338 ret = pca953x_write_single(chip, offset, reg_val, off); 339 if (ret) 340 goto exit; 341 342 chip->reg_output[off / BANK_SZ] = reg_val; 343 exit: 344 mutex_unlock(&chip->i2c_lock); 345 } 346 347 static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios) 348 { 349 struct gpio_chip *gc; 350 351 gc = &chip->gpio_chip; 352 353 gc->direction_input = pca953x_gpio_direction_input; 354 gc->direction_output = pca953x_gpio_direction_output; 355 gc->get = pca953x_gpio_get_value; 356 gc->set = pca953x_gpio_set_value; 357 gc->can_sleep = 1; 358 359 gc->base = chip->gpio_start; 360 gc->ngpio = gpios; 361 gc->label = chip->client->name; 362 gc->dev = &chip->client->dev; 363 gc->owner = THIS_MODULE; 364 gc->names = chip->names; 365 } 366 367 #ifdef CONFIG_GPIO_PCA953X_IRQ 368 static int pca953x_gpio_to_irq(struct gpio_chip *gc, unsigned off) 369 { 370 struct pca953x_chip *chip; 371 372 chip = container_of(gc, struct pca953x_chip, gpio_chip); 373 return irq_create_mapping(chip->domain, off); 374 } 375 376 static void pca953x_irq_mask(struct irq_data *d) 377 { 378 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d); 379 380 chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ)); 381 } 382 383 static void pca953x_irq_unmask(struct irq_data *d) 384 { 385 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d); 386 387 chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ); 388 } 389 390 static void pca953x_irq_bus_lock(struct irq_data *d) 391 { 392 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d); 393 394 mutex_lock(&chip->irq_lock); 395 } 396 397 static void pca953x_irq_bus_sync_unlock(struct irq_data *d) 398 { 399 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d); 400 u8 new_irqs; 401 int level, i; 402 403 /* Look for any newly setup interrupt */ 404 for (i = 0; i < NBANK(chip); i++) { 405 new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i]; 406 new_irqs &= ~chip->reg_direction[i]; 407 408 while (new_irqs) { 409 level = __ffs(new_irqs); 410 pca953x_gpio_direction_input(&chip->gpio_chip, 411 level + (BANK_SZ * i)); 412 new_irqs &= ~(1 << level); 413 } 414 } 415 416 mutex_unlock(&chip->irq_lock); 417 } 418 419 static int pca953x_irq_set_type(struct irq_data *d, unsigned int type) 420 { 421 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d); 422 int bank_nb = d->hwirq / BANK_SZ; 423 u8 mask = 1 << (d->hwirq % BANK_SZ); 424 425 if (!(type & IRQ_TYPE_EDGE_BOTH)) { 426 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n", 427 d->irq, type); 428 return -EINVAL; 429 } 430 431 if (type & IRQ_TYPE_EDGE_FALLING) 432 chip->irq_trig_fall[bank_nb] |= mask; 433 else 434 chip->irq_trig_fall[bank_nb] &= ~mask; 435 436 if (type & IRQ_TYPE_EDGE_RISING) 437 chip->irq_trig_raise[bank_nb] |= mask; 438 else 439 chip->irq_trig_raise[bank_nb] &= ~mask; 440 441 return 0; 442 } 443 444 static struct irq_chip pca953x_irq_chip = { 445 .name = "pca953x", 446 .irq_mask = pca953x_irq_mask, 447 .irq_unmask = pca953x_irq_unmask, 448 .irq_bus_lock = pca953x_irq_bus_lock, 449 .irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock, 450 .irq_set_type = pca953x_irq_set_type, 451 }; 452 453 static u8 pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending) 454 { 455 u8 cur_stat[MAX_BANK]; 456 u8 old_stat[MAX_BANK]; 457 u8 pendings = 0; 458 u8 trigger[MAX_BANK], triggers = 0; 459 int ret, i, offset = 0; 460 461 switch (chip->chip_type) { 462 case PCA953X_TYPE: 463 offset = PCA953X_INPUT; 464 break; 465 case PCA957X_TYPE: 466 offset = PCA957X_IN; 467 break; 468 } 469 ret = pca953x_read_regs(chip, offset, cur_stat); 470 if (ret) 471 return 0; 472 473 /* Remove output pins from the equation */ 474 for (i = 0; i < NBANK(chip); i++) 475 cur_stat[i] &= chip->reg_direction[i]; 476 477 memcpy(old_stat, chip->irq_stat, NBANK(chip)); 478 479 for (i = 0; i < NBANK(chip); i++) { 480 trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i]; 481 triggers += trigger[i]; 482 } 483 484 if (!triggers) 485 return 0; 486 487 memcpy(chip->irq_stat, cur_stat, NBANK(chip)); 488 489 for (i = 0; i < NBANK(chip); i++) { 490 pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) | 491 (cur_stat[i] & chip->irq_trig_raise[i]); 492 pending[i] &= trigger[i]; 493 pendings += pending[i]; 494 } 495 496 return pendings; 497 } 498 499 static irqreturn_t pca953x_irq_handler(int irq, void *devid) 500 { 501 struct pca953x_chip *chip = devid; 502 u8 pending[MAX_BANK]; 503 u8 level; 504 int i; 505 506 if (!pca953x_irq_pending(chip, pending)) 507 return IRQ_HANDLED; 508 509 for (i = 0; i < NBANK(chip); i++) { 510 while (pending[i]) { 511 level = __ffs(pending[i]); 512 handle_nested_irq(irq_find_mapping(chip->domain, 513 level + (BANK_SZ * i))); 514 pending[i] &= ~(1 << level); 515 } 516 } 517 518 return IRQ_HANDLED; 519 } 520 521 static int pca953x_gpio_irq_map(struct irq_domain *d, unsigned int irq, 522 irq_hw_number_t hwirq) 523 { 524 irq_clear_status_flags(irq, IRQ_NOREQUEST); 525 irq_set_chip_data(irq, d->host_data); 526 irq_set_chip(irq, &pca953x_irq_chip); 527 irq_set_nested_thread(irq, true); 528 #ifdef CONFIG_ARM 529 set_irq_flags(irq, IRQF_VALID); 530 #else 531 irq_set_noprobe(irq); 532 #endif 533 534 return 0; 535 } 536 537 static const struct irq_domain_ops pca953x_irq_simple_ops = { 538 .map = pca953x_gpio_irq_map, 539 .xlate = irq_domain_xlate_twocell, 540 }; 541 542 static int pca953x_irq_setup(struct pca953x_chip *chip, 543 const struct i2c_device_id *id, 544 int irq_base) 545 { 546 struct i2c_client *client = chip->client; 547 int ret, i, offset = 0; 548 549 if (irq_base != -1 550 && (id->driver_data & PCA_INT)) { 551 552 switch (chip->chip_type) { 553 case PCA953X_TYPE: 554 offset = PCA953X_INPUT; 555 break; 556 case PCA957X_TYPE: 557 offset = PCA957X_IN; 558 break; 559 } 560 ret = pca953x_read_regs(chip, offset, chip->irq_stat); 561 if (ret) 562 return ret; 563 564 /* 565 * There is no way to know which GPIO line generated the 566 * interrupt. We have to rely on the previous read for 567 * this purpose. 568 */ 569 for (i = 0; i < NBANK(chip); i++) 570 chip->irq_stat[i] &= chip->reg_direction[i]; 571 mutex_init(&chip->irq_lock); 572 573 chip->domain = irq_domain_add_simple(client->dev.of_node, 574 chip->gpio_chip.ngpio, 575 irq_base, 576 &pca953x_irq_simple_ops, 577 chip); 578 if (!chip->domain) 579 return -ENODEV; 580 581 ret = devm_request_threaded_irq(&client->dev, 582 client->irq, 583 NULL, 584 pca953x_irq_handler, 585 IRQF_TRIGGER_LOW | IRQF_ONESHOT, 586 dev_name(&client->dev), chip); 587 if (ret) { 588 dev_err(&client->dev, "failed to request irq %d\n", 589 client->irq); 590 return ret; 591 } 592 593 chip->gpio_chip.to_irq = pca953x_gpio_to_irq; 594 } 595 596 return 0; 597 } 598 599 #else /* CONFIG_GPIO_PCA953X_IRQ */ 600 static int pca953x_irq_setup(struct pca953x_chip *chip, 601 const struct i2c_device_id *id, 602 int irq_base) 603 { 604 struct i2c_client *client = chip->client; 605 606 if (irq_base != -1 && (id->driver_data & PCA_INT)) 607 dev_warn(&client->dev, "interrupt support not compiled in\n"); 608 609 return 0; 610 } 611 #endif 612 613 /* 614 * Handlers for alternative sources of platform_data 615 */ 616 #ifdef CONFIG_OF_GPIO 617 /* 618 * Translate OpenFirmware node properties into platform_data 619 * WARNING: This is DEPRECATED and will be removed eventually! 620 */ 621 static void 622 pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert) 623 { 624 struct device_node *node; 625 const __be32 *val; 626 int size; 627 628 node = client->dev.of_node; 629 if (node == NULL) 630 return; 631 632 *gpio_base = -1; 633 val = of_get_property(node, "linux,gpio-base", &size); 634 WARN(val, "%s: device-tree property 'linux,gpio-base' is deprecated!", __func__); 635 if (val) { 636 if (size != sizeof(*val)) 637 dev_warn(&client->dev, "%s: wrong linux,gpio-base\n", 638 node->full_name); 639 else 640 *gpio_base = be32_to_cpup(val); 641 } 642 643 val = of_get_property(node, "polarity", NULL); 644 WARN(val, "%s: device-tree property 'polarity' is deprecated!", __func__); 645 if (val) 646 *invert = *val; 647 } 648 #else 649 static void 650 pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert) 651 { 652 *gpio_base = -1; 653 } 654 #endif 655 656 static int device_pca953x_init(struct pca953x_chip *chip, u32 invert) 657 { 658 int ret; 659 u8 val[MAX_BANK]; 660 661 ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output); 662 if (ret) 663 goto out; 664 665 ret = pca953x_read_regs(chip, PCA953X_DIRECTION, 666 chip->reg_direction); 667 if (ret) 668 goto out; 669 670 /* set platform specific polarity inversion */ 671 if (invert) 672 memset(val, 0xFF, NBANK(chip)); 673 else 674 memset(val, 0, NBANK(chip)); 675 676 ret = pca953x_write_regs(chip, PCA953X_INVERT, val); 677 out: 678 return ret; 679 } 680 681 static int device_pca957x_init(struct pca953x_chip *chip, u32 invert) 682 { 683 int ret; 684 u8 val[MAX_BANK]; 685 686 /* Let every port in proper state, that could save power */ 687 memset(val, 0, NBANK(chip)); 688 pca953x_write_regs(chip, PCA957X_PUPD, val); 689 memset(val, 0xFF, NBANK(chip)); 690 pca953x_write_regs(chip, PCA957X_CFG, val); 691 memset(val, 0, NBANK(chip)); 692 pca953x_write_regs(chip, PCA957X_OUT, val); 693 694 ret = pca953x_read_regs(chip, PCA957X_IN, val); 695 if (ret) 696 goto out; 697 ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output); 698 if (ret) 699 goto out; 700 ret = pca953x_read_regs(chip, PCA957X_CFG, chip->reg_direction); 701 if (ret) 702 goto out; 703 704 /* set platform specific polarity inversion */ 705 if (invert) 706 memset(val, 0xFF, NBANK(chip)); 707 else 708 memset(val, 0, NBANK(chip)); 709 pca953x_write_regs(chip, PCA957X_INVRT, val); 710 711 /* To enable register 6, 7 to controll pull up and pull down */ 712 memset(val, 0x02, NBANK(chip)); 713 pca953x_write_regs(chip, PCA957X_BKEN, val); 714 715 return 0; 716 out: 717 return ret; 718 } 719 720 static int pca953x_probe(struct i2c_client *client, 721 const struct i2c_device_id *id) 722 { 723 struct pca953x_platform_data *pdata; 724 struct pca953x_chip *chip; 725 int irq_base = 0; 726 int ret; 727 u32 invert = 0; 728 729 chip = devm_kzalloc(&client->dev, 730 sizeof(struct pca953x_chip), GFP_KERNEL); 731 if (chip == NULL) 732 return -ENOMEM; 733 734 pdata = client->dev.platform_data; 735 if (pdata) { 736 irq_base = pdata->irq_base; 737 chip->gpio_start = pdata->gpio_base; 738 invert = pdata->invert; 739 chip->names = pdata->names; 740 } else { 741 pca953x_get_alt_pdata(client, &chip->gpio_start, &invert); 742 #ifdef CONFIG_OF_GPIO 743 /* If I2C node has no interrupts property, disable GPIO interrupts */ 744 if (of_find_property(client->dev.of_node, "interrupts", NULL) == NULL) 745 irq_base = -1; 746 #endif 747 } 748 749 chip->client = client; 750 751 chip->chip_type = id->driver_data & (PCA953X_TYPE | PCA957X_TYPE); 752 753 mutex_init(&chip->i2c_lock); 754 755 /* initialize cached registers from their original values. 756 * we can't share this chip with another i2c master. 757 */ 758 pca953x_setup_gpio(chip, id->driver_data & PCA_GPIO_MASK); 759 760 if (chip->chip_type == PCA953X_TYPE) 761 ret = device_pca953x_init(chip, invert); 762 else 763 ret = device_pca957x_init(chip, invert); 764 if (ret) 765 return ret; 766 767 ret = pca953x_irq_setup(chip, id, irq_base); 768 if (ret) 769 return ret; 770 771 ret = gpiochip_add(&chip->gpio_chip); 772 if (ret) 773 return ret; 774 775 if (pdata && pdata->setup) { 776 ret = pdata->setup(client, chip->gpio_chip.base, 777 chip->gpio_chip.ngpio, pdata->context); 778 if (ret < 0) 779 dev_warn(&client->dev, "setup failed, %d\n", ret); 780 } 781 782 i2c_set_clientdata(client, chip); 783 return 0; 784 } 785 786 static int pca953x_remove(struct i2c_client *client) 787 { 788 struct pca953x_platform_data *pdata = client->dev.platform_data; 789 struct pca953x_chip *chip = i2c_get_clientdata(client); 790 int ret = 0; 791 792 if (pdata && pdata->teardown) { 793 ret = pdata->teardown(client, chip->gpio_chip.base, 794 chip->gpio_chip.ngpio, pdata->context); 795 if (ret < 0) { 796 dev_err(&client->dev, "%s failed, %d\n", 797 "teardown", ret); 798 return ret; 799 } 800 } 801 802 ret = gpiochip_remove(&chip->gpio_chip); 803 if (ret) { 804 dev_err(&client->dev, "%s failed, %d\n", 805 "gpiochip_remove()", ret); 806 return ret; 807 } 808 809 return 0; 810 } 811 812 static const struct of_device_id pca953x_dt_ids[] = { 813 { .compatible = "nxp,pca9505", }, 814 { .compatible = "nxp,pca9534", }, 815 { .compatible = "nxp,pca9535", }, 816 { .compatible = "nxp,pca9536", }, 817 { .compatible = "nxp,pca9537", }, 818 { .compatible = "nxp,pca9538", }, 819 { .compatible = "nxp,pca9539", }, 820 { .compatible = "nxp,pca9554", }, 821 { .compatible = "nxp,pca9555", }, 822 { .compatible = "nxp,pca9556", }, 823 { .compatible = "nxp,pca9557", }, 824 { .compatible = "nxp,pca9574", }, 825 { .compatible = "nxp,pca9575", }, 826 827 { .compatible = "maxim,max7310", }, 828 { .compatible = "maxim,max7312", }, 829 { .compatible = "maxim,max7313", }, 830 { .compatible = "maxim,max7315", }, 831 832 { .compatible = "ti,pca6107", }, 833 { .compatible = "ti,tca6408", }, 834 { .compatible = "ti,tca6416", }, 835 { .compatible = "ti,tca6424", }, 836 { } 837 }; 838 839 MODULE_DEVICE_TABLE(of, pca953x_dt_ids); 840 841 static struct i2c_driver pca953x_driver = { 842 .driver = { 843 .name = "pca953x", 844 .of_match_table = pca953x_dt_ids, 845 }, 846 .probe = pca953x_probe, 847 .remove = pca953x_remove, 848 .id_table = pca953x_id, 849 }; 850 851 static int __init pca953x_init(void) 852 { 853 return i2c_add_driver(&pca953x_driver); 854 } 855 /* register after i2c postcore initcall and before 856 * subsys initcalls that may rely on these GPIOs 857 */ 858 subsys_initcall(pca953x_init); 859 860 static void __exit pca953x_exit(void) 861 { 862 i2c_del_driver(&pca953x_driver); 863 } 864 module_exit(pca953x_exit); 865 866 MODULE_AUTHOR("eric miao <eric.miao@marvell.com>"); 867 MODULE_DESCRIPTION("GPIO expander driver for PCA953x"); 868 MODULE_LICENSE("GPL"); 869