1 /* 2 * GPIO driver for Fintek Super-I/O F71869, F71869A, F71882, F71889 and F81866 3 * 4 * Copyright (C) 2010-2013 LaCie 5 * 6 * Author: Simon Guinot <simon.guinot@sequanux.org> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/init.h> 16 #include <linux/platform_device.h> 17 #include <linux/io.h> 18 #include <linux/gpio/driver.h> 19 #include <linux/bitops.h> 20 21 #define DRVNAME "gpio-f7188x" 22 23 /* 24 * Super-I/O registers 25 */ 26 #define SIO_LDSEL 0x07 /* Logical device select */ 27 #define SIO_DEVID 0x20 /* Device ID (2 bytes) */ 28 #define SIO_DEVREV 0x22 /* Device revision */ 29 #define SIO_MANID 0x23 /* Fintek ID (2 bytes) */ 30 31 #define SIO_LD_GPIO 0x06 /* GPIO logical device */ 32 #define SIO_UNLOCK_KEY 0x87 /* Key to enable Super-I/O */ 33 #define SIO_LOCK_KEY 0xAA /* Key to disable Super-I/O */ 34 35 #define SIO_FINTEK_ID 0x1934 /* Manufacturer ID */ 36 #define SIO_F71869_ID 0x0814 /* F71869 chipset ID */ 37 #define SIO_F71869A_ID 0x1007 /* F71869A chipset ID */ 38 #define SIO_F71882_ID 0x0541 /* F71882 chipset ID */ 39 #define SIO_F71889_ID 0x0909 /* F71889 chipset ID */ 40 #define SIO_F81866_ID 0x1010 /* F81866 chipset ID */ 41 42 enum chips { f71869, f71869a, f71882fg, f71889f, f81866 }; 43 44 static const char * const f7188x_names[] = { 45 "f71869", 46 "f71869a", 47 "f71882fg", 48 "f71889f", 49 "f81866", 50 }; 51 52 struct f7188x_sio { 53 int addr; 54 enum chips type; 55 }; 56 57 struct f7188x_gpio_bank { 58 struct gpio_chip chip; 59 unsigned int regbase; 60 struct f7188x_gpio_data *data; 61 }; 62 63 struct f7188x_gpio_data { 64 struct f7188x_sio *sio; 65 int nr_bank; 66 struct f7188x_gpio_bank *bank; 67 }; 68 69 /* 70 * Super-I/O functions. 71 */ 72 73 static inline int superio_inb(int base, int reg) 74 { 75 outb(reg, base); 76 return inb(base + 1); 77 } 78 79 static int superio_inw(int base, int reg) 80 { 81 int val; 82 83 outb(reg++, base); 84 val = inb(base + 1) << 8; 85 outb(reg, base); 86 val |= inb(base + 1); 87 88 return val; 89 } 90 91 static inline void superio_outb(int base, int reg, int val) 92 { 93 outb(reg, base); 94 outb(val, base + 1); 95 } 96 97 static inline int superio_enter(int base) 98 { 99 /* Don't step on other drivers' I/O space by accident. */ 100 if (!request_muxed_region(base, 2, DRVNAME)) { 101 pr_err(DRVNAME "I/O address 0x%04x already in use\n", base); 102 return -EBUSY; 103 } 104 105 /* According to the datasheet the key must be send twice. */ 106 outb(SIO_UNLOCK_KEY, base); 107 outb(SIO_UNLOCK_KEY, base); 108 109 return 0; 110 } 111 112 static inline void superio_select(int base, int ld) 113 { 114 outb(SIO_LDSEL, base); 115 outb(ld, base + 1); 116 } 117 118 static inline void superio_exit(int base) 119 { 120 outb(SIO_LOCK_KEY, base); 121 release_region(base, 2); 122 } 123 124 /* 125 * GPIO chip. 126 */ 127 128 static int f7188x_gpio_get_direction(struct gpio_chip *chip, unsigned offset); 129 static int f7188x_gpio_direction_in(struct gpio_chip *chip, unsigned offset); 130 static int f7188x_gpio_get(struct gpio_chip *chip, unsigned offset); 131 static int f7188x_gpio_direction_out(struct gpio_chip *chip, 132 unsigned offset, int value); 133 static void f7188x_gpio_set(struct gpio_chip *chip, unsigned offset, int value); 134 static int f7188x_gpio_set_single_ended(struct gpio_chip *gc, 135 unsigned offset, 136 enum single_ended_mode mode); 137 138 #define F7188X_GPIO_BANK(_base, _ngpio, _regbase) \ 139 { \ 140 .chip = { \ 141 .label = DRVNAME, \ 142 .owner = THIS_MODULE, \ 143 .get_direction = f7188x_gpio_get_direction, \ 144 .direction_input = f7188x_gpio_direction_in, \ 145 .get = f7188x_gpio_get, \ 146 .direction_output = f7188x_gpio_direction_out, \ 147 .set = f7188x_gpio_set, \ 148 .set_single_ended = f7188x_gpio_set_single_ended, \ 149 .base = _base, \ 150 .ngpio = _ngpio, \ 151 .can_sleep = true, \ 152 }, \ 153 .regbase = _regbase, \ 154 } 155 156 #define gpio_dir(base) (base + 0) 157 #define gpio_data_out(base) (base + 1) 158 #define gpio_data_in(base) (base + 2) 159 /* Output mode register (0:open drain 1:push-pull). */ 160 #define gpio_out_mode(base) (base + 3) 161 162 static struct f7188x_gpio_bank f71869_gpio_bank[] = { 163 F7188X_GPIO_BANK(0, 6, 0xF0), 164 F7188X_GPIO_BANK(10, 8, 0xE0), 165 F7188X_GPIO_BANK(20, 8, 0xD0), 166 F7188X_GPIO_BANK(30, 8, 0xC0), 167 F7188X_GPIO_BANK(40, 8, 0xB0), 168 F7188X_GPIO_BANK(50, 5, 0xA0), 169 F7188X_GPIO_BANK(60, 6, 0x90), 170 }; 171 172 static struct f7188x_gpio_bank f71869a_gpio_bank[] = { 173 F7188X_GPIO_BANK(0, 6, 0xF0), 174 F7188X_GPIO_BANK(10, 8, 0xE0), 175 F7188X_GPIO_BANK(20, 8, 0xD0), 176 F7188X_GPIO_BANK(30, 8, 0xC0), 177 F7188X_GPIO_BANK(40, 8, 0xB0), 178 F7188X_GPIO_BANK(50, 5, 0xA0), 179 F7188X_GPIO_BANK(60, 8, 0x90), 180 F7188X_GPIO_BANK(70, 8, 0x80), 181 }; 182 183 static struct f7188x_gpio_bank f71882_gpio_bank[] = { 184 F7188X_GPIO_BANK(0, 8, 0xF0), 185 F7188X_GPIO_BANK(10, 8, 0xE0), 186 F7188X_GPIO_BANK(20, 8, 0xD0), 187 F7188X_GPIO_BANK(30, 4, 0xC0), 188 F7188X_GPIO_BANK(40, 4, 0xB0), 189 }; 190 191 static struct f7188x_gpio_bank f71889_gpio_bank[] = { 192 F7188X_GPIO_BANK(0, 7, 0xF0), 193 F7188X_GPIO_BANK(10, 7, 0xE0), 194 F7188X_GPIO_BANK(20, 8, 0xD0), 195 F7188X_GPIO_BANK(30, 8, 0xC0), 196 F7188X_GPIO_BANK(40, 8, 0xB0), 197 F7188X_GPIO_BANK(50, 5, 0xA0), 198 F7188X_GPIO_BANK(60, 8, 0x90), 199 F7188X_GPIO_BANK(70, 8, 0x80), 200 }; 201 202 static struct f7188x_gpio_bank f81866_gpio_bank[] = { 203 F7188X_GPIO_BANK(0, 8, 0xF0), 204 F7188X_GPIO_BANK(10, 8, 0xE0), 205 F7188X_GPIO_BANK(20, 8, 0xD0), 206 F7188X_GPIO_BANK(30, 8, 0xC0), 207 F7188X_GPIO_BANK(40, 8, 0xB0), 208 F7188X_GPIO_BANK(50, 8, 0xA0), 209 F7188X_GPIO_BANK(60, 8, 0x90), 210 F7188X_GPIO_BANK(70, 8, 0x80), 211 F7188X_GPIO_BANK(80, 8, 0x88), 212 }; 213 214 static int f7188x_gpio_get_direction(struct gpio_chip *chip, unsigned offset) 215 { 216 int err; 217 struct f7188x_gpio_bank *bank = 218 container_of(chip, struct f7188x_gpio_bank, chip); 219 struct f7188x_sio *sio = bank->data->sio; 220 u8 dir; 221 222 err = superio_enter(sio->addr); 223 if (err) 224 return err; 225 superio_select(sio->addr, SIO_LD_GPIO); 226 227 dir = superio_inb(sio->addr, gpio_dir(bank->regbase)); 228 229 superio_exit(sio->addr); 230 231 return !(dir & 1 << offset); 232 } 233 234 static int f7188x_gpio_direction_in(struct gpio_chip *chip, unsigned offset) 235 { 236 int err; 237 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 238 struct f7188x_sio *sio = bank->data->sio; 239 u8 dir; 240 241 err = superio_enter(sio->addr); 242 if (err) 243 return err; 244 superio_select(sio->addr, SIO_LD_GPIO); 245 246 dir = superio_inb(sio->addr, gpio_dir(bank->regbase)); 247 dir &= ~BIT(offset); 248 superio_outb(sio->addr, gpio_dir(bank->regbase), dir); 249 250 superio_exit(sio->addr); 251 252 return 0; 253 } 254 255 static int f7188x_gpio_get(struct gpio_chip *chip, unsigned offset) 256 { 257 int err; 258 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 259 struct f7188x_sio *sio = bank->data->sio; 260 u8 dir, data; 261 262 err = superio_enter(sio->addr); 263 if (err) 264 return err; 265 superio_select(sio->addr, SIO_LD_GPIO); 266 267 dir = superio_inb(sio->addr, gpio_dir(bank->regbase)); 268 dir = !!(dir & BIT(offset)); 269 if (dir) 270 data = superio_inb(sio->addr, gpio_data_out(bank->regbase)); 271 else 272 data = superio_inb(sio->addr, gpio_data_in(bank->regbase)); 273 274 superio_exit(sio->addr); 275 276 return !!(data & BIT(offset)); 277 } 278 279 static int f7188x_gpio_direction_out(struct gpio_chip *chip, 280 unsigned offset, int value) 281 { 282 int err; 283 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 284 struct f7188x_sio *sio = bank->data->sio; 285 u8 dir, data_out; 286 287 err = superio_enter(sio->addr); 288 if (err) 289 return err; 290 superio_select(sio->addr, SIO_LD_GPIO); 291 292 data_out = superio_inb(sio->addr, gpio_data_out(bank->regbase)); 293 if (value) 294 data_out |= BIT(offset); 295 else 296 data_out &= ~BIT(offset); 297 superio_outb(sio->addr, gpio_data_out(bank->regbase), data_out); 298 299 dir = superio_inb(sio->addr, gpio_dir(bank->regbase)); 300 dir |= BIT(offset); 301 superio_outb(sio->addr, gpio_dir(bank->regbase), dir); 302 303 superio_exit(sio->addr); 304 305 return 0; 306 } 307 308 static void f7188x_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 309 { 310 int err; 311 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 312 struct f7188x_sio *sio = bank->data->sio; 313 u8 data_out; 314 315 err = superio_enter(sio->addr); 316 if (err) 317 return; 318 superio_select(sio->addr, SIO_LD_GPIO); 319 320 data_out = superio_inb(sio->addr, gpio_data_out(bank->regbase)); 321 if (value) 322 data_out |= BIT(offset); 323 else 324 data_out &= ~BIT(offset); 325 superio_outb(sio->addr, gpio_data_out(bank->regbase), data_out); 326 327 superio_exit(sio->addr); 328 } 329 330 static int f7188x_gpio_set_single_ended(struct gpio_chip *chip, 331 unsigned offset, 332 enum single_ended_mode mode) 333 { 334 int err; 335 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 336 struct f7188x_sio *sio = bank->data->sio; 337 u8 data; 338 339 if (mode != LINE_MODE_OPEN_DRAIN && 340 mode != LINE_MODE_PUSH_PULL) 341 return -ENOTSUPP; 342 343 err = superio_enter(sio->addr); 344 if (err) 345 return err; 346 superio_select(sio->addr, SIO_LD_GPIO); 347 348 data = superio_inb(sio->addr, gpio_out_mode(bank->regbase)); 349 if (mode == LINE_MODE_OPEN_DRAIN) 350 data &= ~BIT(offset); 351 else 352 data |= BIT(offset); 353 superio_outb(sio->addr, gpio_out_mode(bank->regbase), data); 354 355 superio_exit(sio->addr); 356 return 0; 357 } 358 359 /* 360 * Platform device and driver. 361 */ 362 363 static int f7188x_gpio_probe(struct platform_device *pdev) 364 { 365 int err; 366 int i; 367 struct f7188x_sio *sio = dev_get_platdata(&pdev->dev); 368 struct f7188x_gpio_data *data; 369 370 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 371 if (!data) 372 return -ENOMEM; 373 374 switch (sio->type) { 375 case f71869: 376 data->nr_bank = ARRAY_SIZE(f71869_gpio_bank); 377 data->bank = f71869_gpio_bank; 378 break; 379 case f71869a: 380 data->nr_bank = ARRAY_SIZE(f71869a_gpio_bank); 381 data->bank = f71869a_gpio_bank; 382 break; 383 case f71882fg: 384 data->nr_bank = ARRAY_SIZE(f71882_gpio_bank); 385 data->bank = f71882_gpio_bank; 386 break; 387 case f71889f: 388 data->nr_bank = ARRAY_SIZE(f71889_gpio_bank); 389 data->bank = f71889_gpio_bank; 390 break; 391 case f81866: 392 data->nr_bank = ARRAY_SIZE(f81866_gpio_bank); 393 data->bank = f81866_gpio_bank; 394 break; 395 default: 396 return -ENODEV; 397 } 398 data->sio = sio; 399 400 platform_set_drvdata(pdev, data); 401 402 /* For each GPIO bank, register a GPIO chip. */ 403 for (i = 0; i < data->nr_bank; i++) { 404 struct f7188x_gpio_bank *bank = &data->bank[i]; 405 406 bank->chip.parent = &pdev->dev; 407 bank->data = data; 408 409 err = devm_gpiochip_add_data(&pdev->dev, &bank->chip, bank); 410 if (err) { 411 dev_err(&pdev->dev, 412 "Failed to register gpiochip %d: %d\n", 413 i, err); 414 return err; 415 } 416 } 417 418 return 0; 419 } 420 421 static int __init f7188x_find(int addr, struct f7188x_sio *sio) 422 { 423 int err; 424 u16 devid; 425 426 err = superio_enter(addr); 427 if (err) 428 return err; 429 430 err = -ENODEV; 431 devid = superio_inw(addr, SIO_MANID); 432 if (devid != SIO_FINTEK_ID) { 433 pr_debug(DRVNAME ": Not a Fintek device at 0x%08x\n", addr); 434 goto err; 435 } 436 437 devid = superio_inw(addr, SIO_DEVID); 438 switch (devid) { 439 case SIO_F71869_ID: 440 sio->type = f71869; 441 break; 442 case SIO_F71869A_ID: 443 sio->type = f71869a; 444 break; 445 case SIO_F71882_ID: 446 sio->type = f71882fg; 447 break; 448 case SIO_F71889_ID: 449 sio->type = f71889f; 450 break; 451 case SIO_F81866_ID: 452 sio->type = f81866; 453 break; 454 default: 455 pr_info(DRVNAME ": Unsupported Fintek device 0x%04x\n", devid); 456 goto err; 457 } 458 sio->addr = addr; 459 err = 0; 460 461 pr_info(DRVNAME ": Found %s at %#x, revision %d\n", 462 f7188x_names[sio->type], 463 (unsigned int) addr, 464 (int) superio_inb(addr, SIO_DEVREV)); 465 466 err: 467 superio_exit(addr); 468 return err; 469 } 470 471 static struct platform_device *f7188x_gpio_pdev; 472 473 static int __init 474 f7188x_gpio_device_add(const struct f7188x_sio *sio) 475 { 476 int err; 477 478 f7188x_gpio_pdev = platform_device_alloc(DRVNAME, -1); 479 if (!f7188x_gpio_pdev) 480 return -ENOMEM; 481 482 err = platform_device_add_data(f7188x_gpio_pdev, 483 sio, sizeof(*sio)); 484 if (err) { 485 pr_err(DRVNAME "Platform data allocation failed\n"); 486 goto err; 487 } 488 489 err = platform_device_add(f7188x_gpio_pdev); 490 if (err) { 491 pr_err(DRVNAME "Device addition failed\n"); 492 goto err; 493 } 494 495 return 0; 496 497 err: 498 platform_device_put(f7188x_gpio_pdev); 499 500 return err; 501 } 502 503 /* 504 * Try to match a supported Fintek device by reading the (hard-wired) 505 * configuration I/O ports. If available, then register both the platform 506 * device and driver to support the GPIOs. 507 */ 508 509 static struct platform_driver f7188x_gpio_driver = { 510 .driver = { 511 .name = DRVNAME, 512 }, 513 .probe = f7188x_gpio_probe, 514 }; 515 516 static int __init f7188x_gpio_init(void) 517 { 518 int err; 519 struct f7188x_sio sio; 520 521 if (f7188x_find(0x2e, &sio) && 522 f7188x_find(0x4e, &sio)) 523 return -ENODEV; 524 525 err = platform_driver_register(&f7188x_gpio_driver); 526 if (!err) { 527 err = f7188x_gpio_device_add(&sio); 528 if (err) 529 platform_driver_unregister(&f7188x_gpio_driver); 530 } 531 532 return err; 533 } 534 subsys_initcall(f7188x_gpio_init); 535 536 static void __exit f7188x_gpio_exit(void) 537 { 538 platform_device_unregister(f7188x_gpio_pdev); 539 platform_driver_unregister(&f7188x_gpio_driver); 540 } 541 module_exit(f7188x_gpio_exit); 542 543 MODULE_DESCRIPTION("GPIO driver for Super-I/O chips F71869, F71869A, F71882FG, F71889F and F81866"); 544 MODULE_AUTHOR("Simon Guinot <simon.guinot@sequanux.org>"); 545 MODULE_LICENSE("GPL"); 546