1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * GPIO driver for Fintek and Nuvoton Super-I/O chips 4 * 5 * Copyright (C) 2010-2013 LaCie 6 * 7 * Author: Simon Guinot <simon.guinot@sequanux.org> 8 */ 9 10 #define DRVNAME "gpio-f7188x" 11 #define pr_fmt(fmt) DRVNAME ": " fmt 12 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/platform_device.h> 16 #include <linux/io.h> 17 #include <linux/gpio/driver.h> 18 #include <linux/bitops.h> 19 20 /* 21 * Super-I/O registers 22 */ 23 #define SIO_LDSEL 0x07 /* Logical device select */ 24 #define SIO_DEVID 0x20 /* Device ID (2 bytes) */ 25 26 #define SIO_UNLOCK_KEY 0x87 /* Key to enable Super-I/O */ 27 #define SIO_LOCK_KEY 0xAA /* Key to disable Super-I/O */ 28 29 /* 30 * Fintek devices. 31 */ 32 #define SIO_FINTEK_DEVREV 0x22 /* Fintek Device revision */ 33 #define SIO_FINTEK_MANID 0x23 /* Fintek ID (2 bytes) */ 34 35 #define SIO_FINTEK_ID 0x1934 /* Manufacturer ID */ 36 37 #define SIO_F71869_ID 0x0814 /* F71869 chipset ID */ 38 #define SIO_F71869A_ID 0x1007 /* F71869A chipset ID */ 39 #define SIO_F71882_ID 0x0541 /* F71882 chipset ID */ 40 #define SIO_F71889_ID 0x0909 /* F71889 chipset ID */ 41 #define SIO_F71889A_ID 0x1005 /* F71889A chipset ID */ 42 #define SIO_F81866_ID 0x1010 /* F81866 chipset ID */ 43 #define SIO_F81804_ID 0x1502 /* F81804 chipset ID, same for F81966 */ 44 #define SIO_F81865_ID 0x0704 /* F81865 chipset ID */ 45 46 #define SIO_LD_GPIO_FINTEK 0x06 /* GPIO logical device */ 47 48 /* 49 * Nuvoton devices. 50 */ 51 #define SIO_NCT6126D_ID 0xD283 /* NCT6126D chipset ID */ 52 53 #define SIO_LD_GPIO_NUVOTON 0x07 /* GPIO logical device */ 54 55 56 enum chips { 57 f71869, 58 f71869a, 59 f71882fg, 60 f71889a, 61 f71889f, 62 f81866, 63 f81804, 64 f81865, 65 nct6126d, 66 }; 67 68 static const char * const f7188x_names[] = { 69 "f71869", 70 "f71869a", 71 "f71882fg", 72 "f71889a", 73 "f71889f", 74 "f81866", 75 "f81804", 76 "f81865", 77 "nct6126d", 78 }; 79 80 struct f7188x_sio { 81 int addr; 82 int device; 83 enum chips type; 84 }; 85 86 struct f7188x_gpio_bank { 87 struct gpio_chip chip; 88 unsigned int regbase; 89 struct f7188x_gpio_data *data; 90 }; 91 92 struct f7188x_gpio_data { 93 struct f7188x_sio *sio; 94 int nr_bank; 95 struct f7188x_gpio_bank *bank; 96 }; 97 98 /* 99 * Super-I/O functions. 100 */ 101 102 static inline int superio_inb(int base, int reg) 103 { 104 outb(reg, base); 105 return inb(base + 1); 106 } 107 108 static int superio_inw(int base, int reg) 109 { 110 int val; 111 112 outb(reg++, base); 113 val = inb(base + 1) << 8; 114 outb(reg, base); 115 val |= inb(base + 1); 116 117 return val; 118 } 119 120 static inline void superio_outb(int base, int reg, int val) 121 { 122 outb(reg, base); 123 outb(val, base + 1); 124 } 125 126 static inline int superio_enter(int base) 127 { 128 /* Don't step on other drivers' I/O space by accident. */ 129 if (!request_muxed_region(base, 2, DRVNAME)) { 130 pr_err("I/O address 0x%04x already in use\n", base); 131 return -EBUSY; 132 } 133 134 /* According to the datasheet the key must be send twice. */ 135 outb(SIO_UNLOCK_KEY, base); 136 outb(SIO_UNLOCK_KEY, base); 137 138 return 0; 139 } 140 141 static inline void superio_select(int base, int ld) 142 { 143 outb(SIO_LDSEL, base); 144 outb(ld, base + 1); 145 } 146 147 static inline void superio_exit(int base) 148 { 149 outb(SIO_LOCK_KEY, base); 150 release_region(base, 2); 151 } 152 153 /* 154 * GPIO chip. 155 */ 156 157 static int f7188x_gpio_get_direction(struct gpio_chip *chip, unsigned offset); 158 static int f7188x_gpio_direction_in(struct gpio_chip *chip, unsigned offset); 159 static int f7188x_gpio_get(struct gpio_chip *chip, unsigned offset); 160 static int f7188x_gpio_direction_out(struct gpio_chip *chip, 161 unsigned offset, int value); 162 static int f7188x_gpio_set(struct gpio_chip *chip, unsigned int offset, 163 int value); 164 static int f7188x_gpio_set_config(struct gpio_chip *chip, unsigned offset, 165 unsigned long config); 166 167 #define F7188X_GPIO_BANK(_ngpio, _regbase, _label) \ 168 { \ 169 .chip = { \ 170 .label = _label, \ 171 .owner = THIS_MODULE, \ 172 .get_direction = f7188x_gpio_get_direction, \ 173 .direction_input = f7188x_gpio_direction_in, \ 174 .get = f7188x_gpio_get, \ 175 .direction_output = f7188x_gpio_direction_out, \ 176 .set = f7188x_gpio_set, \ 177 .set_config = f7188x_gpio_set_config, \ 178 .base = -1, \ 179 .ngpio = _ngpio, \ 180 .can_sleep = true, \ 181 }, \ 182 .regbase = _regbase, \ 183 } 184 185 #define f7188x_gpio_dir(base) ((base) + 0) 186 #define f7188x_gpio_data_out(base) ((base) + 1) 187 #define f7188x_gpio_data_in(base) ((base) + 2) 188 /* Output mode register (0:open drain 1:push-pull). */ 189 #define f7188x_gpio_out_mode(base) ((base) + 3) 190 191 #define f7188x_gpio_dir_invert(type) ((type) == nct6126d) 192 #define f7188x_gpio_data_single(type) ((type) == nct6126d) 193 194 static struct f7188x_gpio_bank f71869_gpio_bank[] = { 195 F7188X_GPIO_BANK(6, 0xF0, DRVNAME "-0"), 196 F7188X_GPIO_BANK(8, 0xE0, DRVNAME "-1"), 197 F7188X_GPIO_BANK(8, 0xD0, DRVNAME "-2"), 198 F7188X_GPIO_BANK(8, 0xC0, DRVNAME "-3"), 199 F7188X_GPIO_BANK(8, 0xB0, DRVNAME "-4"), 200 F7188X_GPIO_BANK(5, 0xA0, DRVNAME "-5"), 201 F7188X_GPIO_BANK(6, 0x90, DRVNAME "-6"), 202 }; 203 204 static struct f7188x_gpio_bank f71869a_gpio_bank[] = { 205 F7188X_GPIO_BANK(6, 0xF0, DRVNAME "-0"), 206 F7188X_GPIO_BANK(8, 0xE0, DRVNAME "-1"), 207 F7188X_GPIO_BANK(8, 0xD0, DRVNAME "-2"), 208 F7188X_GPIO_BANK(8, 0xC0, DRVNAME "-3"), 209 F7188X_GPIO_BANK(8, 0xB0, DRVNAME "-4"), 210 F7188X_GPIO_BANK(5, 0xA0, DRVNAME "-5"), 211 F7188X_GPIO_BANK(8, 0x90, DRVNAME "-6"), 212 F7188X_GPIO_BANK(8, 0x80, DRVNAME "-7"), 213 }; 214 215 static struct f7188x_gpio_bank f71882_gpio_bank[] = { 216 F7188X_GPIO_BANK(8, 0xF0, DRVNAME "-0"), 217 F7188X_GPIO_BANK(8, 0xE0, DRVNAME "-1"), 218 F7188X_GPIO_BANK(8, 0xD0, DRVNAME "-2"), 219 F7188X_GPIO_BANK(4, 0xC0, DRVNAME "-3"), 220 F7188X_GPIO_BANK(4, 0xB0, DRVNAME "-4"), 221 }; 222 223 static struct f7188x_gpio_bank f71889a_gpio_bank[] = { 224 F7188X_GPIO_BANK(7, 0xF0, DRVNAME "-0"), 225 F7188X_GPIO_BANK(7, 0xE0, DRVNAME "-1"), 226 F7188X_GPIO_BANK(8, 0xD0, DRVNAME "-2"), 227 F7188X_GPIO_BANK(8, 0xC0, DRVNAME "-3"), 228 F7188X_GPIO_BANK(8, 0xB0, DRVNAME "-4"), 229 F7188X_GPIO_BANK(5, 0xA0, DRVNAME "-5"), 230 F7188X_GPIO_BANK(8, 0x90, DRVNAME "-6"), 231 F7188X_GPIO_BANK(8, 0x80, DRVNAME "-7"), 232 }; 233 234 static struct f7188x_gpio_bank f71889_gpio_bank[] = { 235 F7188X_GPIO_BANK(7, 0xF0, DRVNAME "-0"), 236 F7188X_GPIO_BANK(7, 0xE0, DRVNAME "-1"), 237 F7188X_GPIO_BANK(8, 0xD0, DRVNAME "-2"), 238 F7188X_GPIO_BANK(8, 0xC0, DRVNAME "-3"), 239 F7188X_GPIO_BANK(8, 0xB0, DRVNAME "-4"), 240 F7188X_GPIO_BANK(5, 0xA0, DRVNAME "-5"), 241 F7188X_GPIO_BANK(8, 0x90, DRVNAME "-6"), 242 F7188X_GPIO_BANK(8, 0x80, DRVNAME "-7"), 243 }; 244 245 static struct f7188x_gpio_bank f81866_gpio_bank[] = { 246 F7188X_GPIO_BANK(8, 0xF0, DRVNAME "-0"), 247 F7188X_GPIO_BANK(8, 0xE0, DRVNAME "-1"), 248 F7188X_GPIO_BANK(8, 0xD0, DRVNAME "-2"), 249 F7188X_GPIO_BANK(8, 0xC0, DRVNAME "-3"), 250 F7188X_GPIO_BANK(8, 0xB0, DRVNAME "-4"), 251 F7188X_GPIO_BANK(8, 0xA0, DRVNAME "-5"), 252 F7188X_GPIO_BANK(8, 0x90, DRVNAME "-6"), 253 F7188X_GPIO_BANK(8, 0x80, DRVNAME "-7"), 254 F7188X_GPIO_BANK(8, 0x88, DRVNAME "-8"), 255 }; 256 257 258 static struct f7188x_gpio_bank f81804_gpio_bank[] = { 259 F7188X_GPIO_BANK(8, 0xF0, DRVNAME "-0"), 260 F7188X_GPIO_BANK(8, 0xE0, DRVNAME "-1"), 261 F7188X_GPIO_BANK(8, 0xD0, DRVNAME "-2"), 262 F7188X_GPIO_BANK(8, 0xA0, DRVNAME "-3"), 263 F7188X_GPIO_BANK(8, 0x90, DRVNAME "-4"), 264 F7188X_GPIO_BANK(8, 0x80, DRVNAME "-5"), 265 F7188X_GPIO_BANK(8, 0x98, DRVNAME "-6"), 266 }; 267 268 static struct f7188x_gpio_bank f81865_gpio_bank[] = { 269 F7188X_GPIO_BANK(8, 0xF0, DRVNAME "-0"), 270 F7188X_GPIO_BANK(8, 0xE0, DRVNAME "-1"), 271 F7188X_GPIO_BANK(8, 0xD0, DRVNAME "-2"), 272 F7188X_GPIO_BANK(8, 0xC0, DRVNAME "-3"), 273 F7188X_GPIO_BANK(8, 0xB0, DRVNAME "-4"), 274 F7188X_GPIO_BANK(8, 0xA0, DRVNAME "-5"), 275 F7188X_GPIO_BANK(5, 0x90, DRVNAME "-6"), 276 }; 277 278 static struct f7188x_gpio_bank nct6126d_gpio_bank[] = { 279 F7188X_GPIO_BANK(8, 0xE0, DRVNAME "-0"), 280 F7188X_GPIO_BANK(8, 0xE4, DRVNAME "-1"), 281 F7188X_GPIO_BANK(8, 0xE8, DRVNAME "-2"), 282 F7188X_GPIO_BANK(8, 0xEC, DRVNAME "-3"), 283 F7188X_GPIO_BANK(8, 0xF0, DRVNAME "-4"), 284 F7188X_GPIO_BANK(8, 0xF4, DRVNAME "-5"), 285 F7188X_GPIO_BANK(8, 0xF8, DRVNAME "-6"), 286 F7188X_GPIO_BANK(8, 0xFC, DRVNAME "-7"), 287 }; 288 289 static int f7188x_gpio_get_direction(struct gpio_chip *chip, unsigned offset) 290 { 291 int err; 292 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 293 struct f7188x_sio *sio = bank->data->sio; 294 u8 dir; 295 296 err = superio_enter(sio->addr); 297 if (err) 298 return err; 299 superio_select(sio->addr, sio->device); 300 301 dir = superio_inb(sio->addr, f7188x_gpio_dir(bank->regbase)); 302 303 superio_exit(sio->addr); 304 305 if (f7188x_gpio_dir_invert(sio->type)) 306 dir = ~dir; 307 308 if (dir & BIT(offset)) 309 return GPIO_LINE_DIRECTION_OUT; 310 311 return GPIO_LINE_DIRECTION_IN; 312 } 313 314 static int f7188x_gpio_direction_in(struct gpio_chip *chip, unsigned offset) 315 { 316 int err; 317 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 318 struct f7188x_sio *sio = bank->data->sio; 319 u8 dir; 320 321 err = superio_enter(sio->addr); 322 if (err) 323 return err; 324 superio_select(sio->addr, sio->device); 325 326 dir = superio_inb(sio->addr, f7188x_gpio_dir(bank->regbase)); 327 328 if (f7188x_gpio_dir_invert(sio->type)) 329 dir |= BIT(offset); 330 else 331 dir &= ~BIT(offset); 332 superio_outb(sio->addr, f7188x_gpio_dir(bank->regbase), dir); 333 334 superio_exit(sio->addr); 335 336 return 0; 337 } 338 339 static int f7188x_gpio_get(struct gpio_chip *chip, unsigned offset) 340 { 341 int err; 342 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 343 struct f7188x_sio *sio = bank->data->sio; 344 u8 dir, data; 345 346 err = superio_enter(sio->addr); 347 if (err) 348 return err; 349 superio_select(sio->addr, sio->device); 350 351 dir = superio_inb(sio->addr, f7188x_gpio_dir(bank->regbase)); 352 dir = !!(dir & BIT(offset)); 353 if (f7188x_gpio_data_single(sio->type) || dir) 354 data = superio_inb(sio->addr, f7188x_gpio_data_out(bank->regbase)); 355 else 356 data = superio_inb(sio->addr, f7188x_gpio_data_in(bank->regbase)); 357 358 superio_exit(sio->addr); 359 360 return !!(data & BIT(offset)); 361 } 362 363 static int f7188x_gpio_direction_out(struct gpio_chip *chip, 364 unsigned offset, int value) 365 { 366 int err; 367 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 368 struct f7188x_sio *sio = bank->data->sio; 369 u8 dir, data_out; 370 371 err = superio_enter(sio->addr); 372 if (err) 373 return err; 374 superio_select(sio->addr, sio->device); 375 376 data_out = superio_inb(sio->addr, f7188x_gpio_data_out(bank->regbase)); 377 if (value) 378 data_out |= BIT(offset); 379 else 380 data_out &= ~BIT(offset); 381 superio_outb(sio->addr, f7188x_gpio_data_out(bank->regbase), data_out); 382 383 dir = superio_inb(sio->addr, f7188x_gpio_dir(bank->regbase)); 384 if (f7188x_gpio_dir_invert(sio->type)) 385 dir &= ~BIT(offset); 386 else 387 dir |= BIT(offset); 388 superio_outb(sio->addr, f7188x_gpio_dir(bank->regbase), dir); 389 390 superio_exit(sio->addr); 391 392 return 0; 393 } 394 395 static int f7188x_gpio_set(struct gpio_chip *chip, unsigned int offset, 396 int value) 397 { 398 int err; 399 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 400 struct f7188x_sio *sio = bank->data->sio; 401 u8 data_out; 402 403 err = superio_enter(sio->addr); 404 if (err) 405 return err; 406 407 superio_select(sio->addr, sio->device); 408 409 data_out = superio_inb(sio->addr, f7188x_gpio_data_out(bank->regbase)); 410 if (value) 411 data_out |= BIT(offset); 412 else 413 data_out &= ~BIT(offset); 414 superio_outb(sio->addr, f7188x_gpio_data_out(bank->regbase), data_out); 415 416 superio_exit(sio->addr); 417 418 return 0; 419 } 420 421 static int f7188x_gpio_set_config(struct gpio_chip *chip, unsigned offset, 422 unsigned long config) 423 { 424 int err; 425 enum pin_config_param param = pinconf_to_config_param(config); 426 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 427 struct f7188x_sio *sio = bank->data->sio; 428 u8 data; 429 430 if (param != PIN_CONFIG_DRIVE_OPEN_DRAIN && 431 param != PIN_CONFIG_DRIVE_PUSH_PULL) 432 return -ENOTSUPP; 433 434 err = superio_enter(sio->addr); 435 if (err) 436 return err; 437 superio_select(sio->addr, sio->device); 438 439 data = superio_inb(sio->addr, f7188x_gpio_out_mode(bank->regbase)); 440 if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN) 441 data &= ~BIT(offset); 442 else 443 data |= BIT(offset); 444 superio_outb(sio->addr, f7188x_gpio_out_mode(bank->regbase), data); 445 446 superio_exit(sio->addr); 447 return 0; 448 } 449 450 /* 451 * Platform device and driver. 452 */ 453 454 static int f7188x_gpio_probe(struct platform_device *pdev) 455 { 456 int err; 457 int i; 458 struct f7188x_sio *sio = dev_get_platdata(&pdev->dev); 459 struct f7188x_gpio_data *data; 460 461 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 462 if (!data) 463 return -ENOMEM; 464 465 switch (sio->type) { 466 case f71869: 467 data->nr_bank = ARRAY_SIZE(f71869_gpio_bank); 468 data->bank = f71869_gpio_bank; 469 break; 470 case f71869a: 471 data->nr_bank = ARRAY_SIZE(f71869a_gpio_bank); 472 data->bank = f71869a_gpio_bank; 473 break; 474 case f71882fg: 475 data->nr_bank = ARRAY_SIZE(f71882_gpio_bank); 476 data->bank = f71882_gpio_bank; 477 break; 478 case f71889a: 479 data->nr_bank = ARRAY_SIZE(f71889a_gpio_bank); 480 data->bank = f71889a_gpio_bank; 481 break; 482 case f71889f: 483 data->nr_bank = ARRAY_SIZE(f71889_gpio_bank); 484 data->bank = f71889_gpio_bank; 485 break; 486 case f81866: 487 data->nr_bank = ARRAY_SIZE(f81866_gpio_bank); 488 data->bank = f81866_gpio_bank; 489 break; 490 case f81804: 491 data->nr_bank = ARRAY_SIZE(f81804_gpio_bank); 492 data->bank = f81804_gpio_bank; 493 break; 494 case f81865: 495 data->nr_bank = ARRAY_SIZE(f81865_gpio_bank); 496 data->bank = f81865_gpio_bank; 497 break; 498 case nct6126d: 499 data->nr_bank = ARRAY_SIZE(nct6126d_gpio_bank); 500 data->bank = nct6126d_gpio_bank; 501 break; 502 default: 503 return -ENODEV; 504 } 505 data->sio = sio; 506 507 platform_set_drvdata(pdev, data); 508 509 /* For each GPIO bank, register a GPIO chip. */ 510 for (i = 0; i < data->nr_bank; i++) { 511 struct f7188x_gpio_bank *bank = &data->bank[i]; 512 513 bank->chip.parent = &pdev->dev; 514 bank->data = data; 515 516 err = devm_gpiochip_add_data(&pdev->dev, &bank->chip, bank); 517 if (err) { 518 dev_err(&pdev->dev, 519 "Failed to register gpiochip %d: %d\n", 520 i, err); 521 return err; 522 } 523 } 524 525 return 0; 526 } 527 528 static int __init f7188x_find(int addr, struct f7188x_sio *sio) 529 { 530 int err; 531 u16 devid; 532 u16 manid; 533 534 err = superio_enter(addr); 535 if (err) 536 return err; 537 538 err = -ENODEV; 539 540 sio->device = SIO_LD_GPIO_FINTEK; 541 devid = superio_inw(addr, SIO_DEVID); 542 switch (devid) { 543 case SIO_F71869_ID: 544 sio->type = f71869; 545 break; 546 case SIO_F71869A_ID: 547 sio->type = f71869a; 548 break; 549 case SIO_F71882_ID: 550 sio->type = f71882fg; 551 break; 552 case SIO_F71889A_ID: 553 sio->type = f71889a; 554 break; 555 case SIO_F71889_ID: 556 sio->type = f71889f; 557 break; 558 case SIO_F81866_ID: 559 sio->type = f81866; 560 break; 561 case SIO_F81804_ID: 562 sio->type = f81804; 563 break; 564 case SIO_F81865_ID: 565 sio->type = f81865; 566 break; 567 case SIO_NCT6126D_ID: 568 sio->device = SIO_LD_GPIO_NUVOTON; 569 sio->type = nct6126d; 570 break; 571 default: 572 pr_info("Unsupported Fintek device 0x%04x\n", devid); 573 goto err; 574 } 575 576 /* double check manufacturer where possible */ 577 if (sio->type != nct6126d) { 578 manid = superio_inw(addr, SIO_FINTEK_MANID); 579 if (manid != SIO_FINTEK_ID) { 580 pr_debug("Not a Fintek device at 0x%08x\n", addr); 581 goto err; 582 } 583 } 584 585 sio->addr = addr; 586 err = 0; 587 588 pr_info("Found %s at %#x\n", f7188x_names[sio->type], (unsigned int)addr); 589 if (sio->type != nct6126d) 590 pr_info(" revision %d\n", superio_inb(addr, SIO_FINTEK_DEVREV)); 591 592 err: 593 superio_exit(addr); 594 return err; 595 } 596 597 static struct platform_device *f7188x_gpio_pdev; 598 599 static int __init 600 f7188x_gpio_device_add(const struct f7188x_sio *sio) 601 { 602 int err; 603 604 f7188x_gpio_pdev = platform_device_alloc(DRVNAME, -1); 605 if (!f7188x_gpio_pdev) 606 return -ENOMEM; 607 608 err = platform_device_add_data(f7188x_gpio_pdev, 609 sio, sizeof(*sio)); 610 if (err) { 611 pr_err("Platform data allocation failed\n"); 612 goto err; 613 } 614 615 err = platform_device_add(f7188x_gpio_pdev); 616 if (err) { 617 pr_err("Device addition failed\n"); 618 goto err; 619 } 620 621 return 0; 622 623 err: 624 platform_device_put(f7188x_gpio_pdev); 625 626 return err; 627 } 628 629 /* 630 * Try to match a supported Fintek device by reading the (hard-wired) 631 * configuration I/O ports. If available, then register both the platform 632 * device and driver to support the GPIOs. 633 */ 634 635 static struct platform_driver f7188x_gpio_driver = { 636 .driver = { 637 .name = DRVNAME, 638 }, 639 .probe = f7188x_gpio_probe, 640 }; 641 642 static int __init f7188x_gpio_init(void) 643 { 644 int err; 645 struct f7188x_sio sio; 646 647 if (f7188x_find(0x2e, &sio) && 648 f7188x_find(0x4e, &sio)) 649 return -ENODEV; 650 651 err = platform_driver_register(&f7188x_gpio_driver); 652 if (!err) { 653 err = f7188x_gpio_device_add(&sio); 654 if (err) 655 platform_driver_unregister(&f7188x_gpio_driver); 656 } 657 658 return err; 659 } 660 subsys_initcall(f7188x_gpio_init); 661 662 static void __exit f7188x_gpio_exit(void) 663 { 664 platform_device_unregister(f7188x_gpio_pdev); 665 platform_driver_unregister(&f7188x_gpio_driver); 666 } 667 module_exit(f7188x_gpio_exit); 668 669 MODULE_DESCRIPTION("GPIO driver for Super-I/O chips F71869, F71869A, F71882FG, F71889A, F71889F and F81866"); 670 MODULE_AUTHOR("Simon Guinot <simon.guinot@sequanux.org>"); 671 MODULE_LICENSE("GPL"); 672