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_config(struct gpio_chip *chip, unsigned offset, 135 unsigned long config); 136 137 #define F7188X_GPIO_BANK(_base, _ngpio, _regbase) \ 138 { \ 139 .chip = { \ 140 .label = DRVNAME, \ 141 .owner = THIS_MODULE, \ 142 .get_direction = f7188x_gpio_get_direction, \ 143 .direction_input = f7188x_gpio_direction_in, \ 144 .get = f7188x_gpio_get, \ 145 .direction_output = f7188x_gpio_direction_out, \ 146 .set = f7188x_gpio_set, \ 147 .set_config = f7188x_gpio_set_config, \ 148 .base = _base, \ 149 .ngpio = _ngpio, \ 150 .can_sleep = true, \ 151 }, \ 152 .regbase = _regbase, \ 153 } 154 155 #define gpio_dir(base) (base + 0) 156 #define gpio_data_out(base) (base + 1) 157 #define gpio_data_in(base) (base + 2) 158 /* Output mode register (0:open drain 1:push-pull). */ 159 #define gpio_out_mode(base) (base + 3) 160 161 static struct f7188x_gpio_bank f71869_gpio_bank[] = { 162 F7188X_GPIO_BANK(0, 6, 0xF0), 163 F7188X_GPIO_BANK(10, 8, 0xE0), 164 F7188X_GPIO_BANK(20, 8, 0xD0), 165 F7188X_GPIO_BANK(30, 8, 0xC0), 166 F7188X_GPIO_BANK(40, 8, 0xB0), 167 F7188X_GPIO_BANK(50, 5, 0xA0), 168 F7188X_GPIO_BANK(60, 6, 0x90), 169 }; 170 171 static struct f7188x_gpio_bank f71869a_gpio_bank[] = { 172 F7188X_GPIO_BANK(0, 6, 0xF0), 173 F7188X_GPIO_BANK(10, 8, 0xE0), 174 F7188X_GPIO_BANK(20, 8, 0xD0), 175 F7188X_GPIO_BANK(30, 8, 0xC0), 176 F7188X_GPIO_BANK(40, 8, 0xB0), 177 F7188X_GPIO_BANK(50, 5, 0xA0), 178 F7188X_GPIO_BANK(60, 8, 0x90), 179 F7188X_GPIO_BANK(70, 8, 0x80), 180 }; 181 182 static struct f7188x_gpio_bank f71882_gpio_bank[] = { 183 F7188X_GPIO_BANK(0, 8, 0xF0), 184 F7188X_GPIO_BANK(10, 8, 0xE0), 185 F7188X_GPIO_BANK(20, 8, 0xD0), 186 F7188X_GPIO_BANK(30, 4, 0xC0), 187 F7188X_GPIO_BANK(40, 4, 0xB0), 188 }; 189 190 static struct f7188x_gpio_bank f71889_gpio_bank[] = { 191 F7188X_GPIO_BANK(0, 7, 0xF0), 192 F7188X_GPIO_BANK(10, 7, 0xE0), 193 F7188X_GPIO_BANK(20, 8, 0xD0), 194 F7188X_GPIO_BANK(30, 8, 0xC0), 195 F7188X_GPIO_BANK(40, 8, 0xB0), 196 F7188X_GPIO_BANK(50, 5, 0xA0), 197 F7188X_GPIO_BANK(60, 8, 0x90), 198 F7188X_GPIO_BANK(70, 8, 0x80), 199 }; 200 201 static struct f7188x_gpio_bank f81866_gpio_bank[] = { 202 F7188X_GPIO_BANK(0, 8, 0xF0), 203 F7188X_GPIO_BANK(10, 8, 0xE0), 204 F7188X_GPIO_BANK(20, 8, 0xD0), 205 F7188X_GPIO_BANK(30, 8, 0xC0), 206 F7188X_GPIO_BANK(40, 8, 0xB0), 207 F7188X_GPIO_BANK(50, 8, 0xA0), 208 F7188X_GPIO_BANK(60, 8, 0x90), 209 F7188X_GPIO_BANK(70, 8, 0x80), 210 F7188X_GPIO_BANK(80, 8, 0x88), 211 }; 212 213 static int f7188x_gpio_get_direction(struct gpio_chip *chip, unsigned offset) 214 { 215 int err; 216 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 217 struct f7188x_sio *sio = bank->data->sio; 218 u8 dir; 219 220 err = superio_enter(sio->addr); 221 if (err) 222 return err; 223 superio_select(sio->addr, SIO_LD_GPIO); 224 225 dir = superio_inb(sio->addr, gpio_dir(bank->regbase)); 226 227 superio_exit(sio->addr); 228 229 return !(dir & 1 << offset); 230 } 231 232 static int f7188x_gpio_direction_in(struct gpio_chip *chip, unsigned offset) 233 { 234 int err; 235 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 236 struct f7188x_sio *sio = bank->data->sio; 237 u8 dir; 238 239 err = superio_enter(sio->addr); 240 if (err) 241 return err; 242 superio_select(sio->addr, SIO_LD_GPIO); 243 244 dir = superio_inb(sio->addr, gpio_dir(bank->regbase)); 245 dir &= ~BIT(offset); 246 superio_outb(sio->addr, gpio_dir(bank->regbase), dir); 247 248 superio_exit(sio->addr); 249 250 return 0; 251 } 252 253 static int f7188x_gpio_get(struct gpio_chip *chip, unsigned offset) 254 { 255 int err; 256 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 257 struct f7188x_sio *sio = bank->data->sio; 258 u8 dir, data; 259 260 err = superio_enter(sio->addr); 261 if (err) 262 return err; 263 superio_select(sio->addr, SIO_LD_GPIO); 264 265 dir = superio_inb(sio->addr, gpio_dir(bank->regbase)); 266 dir = !!(dir & BIT(offset)); 267 if (dir) 268 data = superio_inb(sio->addr, gpio_data_out(bank->regbase)); 269 else 270 data = superio_inb(sio->addr, gpio_data_in(bank->regbase)); 271 272 superio_exit(sio->addr); 273 274 return !!(data & BIT(offset)); 275 } 276 277 static int f7188x_gpio_direction_out(struct gpio_chip *chip, 278 unsigned offset, int value) 279 { 280 int err; 281 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 282 struct f7188x_sio *sio = bank->data->sio; 283 u8 dir, data_out; 284 285 err = superio_enter(sio->addr); 286 if (err) 287 return err; 288 superio_select(sio->addr, SIO_LD_GPIO); 289 290 data_out = superio_inb(sio->addr, gpio_data_out(bank->regbase)); 291 if (value) 292 data_out |= BIT(offset); 293 else 294 data_out &= ~BIT(offset); 295 superio_outb(sio->addr, gpio_data_out(bank->regbase), data_out); 296 297 dir = superio_inb(sio->addr, gpio_dir(bank->regbase)); 298 dir |= BIT(offset); 299 superio_outb(sio->addr, gpio_dir(bank->regbase), dir); 300 301 superio_exit(sio->addr); 302 303 return 0; 304 } 305 306 static void f7188x_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 307 { 308 int err; 309 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 310 struct f7188x_sio *sio = bank->data->sio; 311 u8 data_out; 312 313 err = superio_enter(sio->addr); 314 if (err) 315 return; 316 superio_select(sio->addr, SIO_LD_GPIO); 317 318 data_out = superio_inb(sio->addr, gpio_data_out(bank->regbase)); 319 if (value) 320 data_out |= BIT(offset); 321 else 322 data_out &= ~BIT(offset); 323 superio_outb(sio->addr, gpio_data_out(bank->regbase), data_out); 324 325 superio_exit(sio->addr); 326 } 327 328 static int f7188x_gpio_set_config(struct gpio_chip *chip, unsigned offset, 329 unsigned long config) 330 { 331 int err; 332 enum pin_config_param param = pinconf_to_config_param(config); 333 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 334 struct f7188x_sio *sio = bank->data->sio; 335 u8 data; 336 337 if (param != PIN_CONFIG_DRIVE_OPEN_DRAIN && 338 param != PIN_CONFIG_DRIVE_PUSH_PULL) 339 return -ENOTSUPP; 340 341 err = superio_enter(sio->addr); 342 if (err) 343 return err; 344 superio_select(sio->addr, SIO_LD_GPIO); 345 346 data = superio_inb(sio->addr, gpio_out_mode(bank->regbase)); 347 if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN) 348 data &= ~BIT(offset); 349 else 350 data |= BIT(offset); 351 superio_outb(sio->addr, gpio_out_mode(bank->regbase), data); 352 353 superio_exit(sio->addr); 354 return 0; 355 } 356 357 /* 358 * Platform device and driver. 359 */ 360 361 static int f7188x_gpio_probe(struct platform_device *pdev) 362 { 363 int err; 364 int i; 365 struct f7188x_sio *sio = dev_get_platdata(&pdev->dev); 366 struct f7188x_gpio_data *data; 367 368 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 369 if (!data) 370 return -ENOMEM; 371 372 switch (sio->type) { 373 case f71869: 374 data->nr_bank = ARRAY_SIZE(f71869_gpio_bank); 375 data->bank = f71869_gpio_bank; 376 break; 377 case f71869a: 378 data->nr_bank = ARRAY_SIZE(f71869a_gpio_bank); 379 data->bank = f71869a_gpio_bank; 380 break; 381 case f71882fg: 382 data->nr_bank = ARRAY_SIZE(f71882_gpio_bank); 383 data->bank = f71882_gpio_bank; 384 break; 385 case f71889f: 386 data->nr_bank = ARRAY_SIZE(f71889_gpio_bank); 387 data->bank = f71889_gpio_bank; 388 break; 389 case f81866: 390 data->nr_bank = ARRAY_SIZE(f81866_gpio_bank); 391 data->bank = f81866_gpio_bank; 392 break; 393 default: 394 return -ENODEV; 395 } 396 data->sio = sio; 397 398 platform_set_drvdata(pdev, data); 399 400 /* For each GPIO bank, register a GPIO chip. */ 401 for (i = 0; i < data->nr_bank; i++) { 402 struct f7188x_gpio_bank *bank = &data->bank[i]; 403 404 bank->chip.parent = &pdev->dev; 405 bank->data = data; 406 407 err = devm_gpiochip_add_data(&pdev->dev, &bank->chip, bank); 408 if (err) { 409 dev_err(&pdev->dev, 410 "Failed to register gpiochip %d: %d\n", 411 i, err); 412 return err; 413 } 414 } 415 416 return 0; 417 } 418 419 static int __init f7188x_find(int addr, struct f7188x_sio *sio) 420 { 421 int err; 422 u16 devid; 423 424 err = superio_enter(addr); 425 if (err) 426 return err; 427 428 err = -ENODEV; 429 devid = superio_inw(addr, SIO_MANID); 430 if (devid != SIO_FINTEK_ID) { 431 pr_debug(DRVNAME ": Not a Fintek device at 0x%08x\n", addr); 432 goto err; 433 } 434 435 devid = superio_inw(addr, SIO_DEVID); 436 switch (devid) { 437 case SIO_F71869_ID: 438 sio->type = f71869; 439 break; 440 case SIO_F71869A_ID: 441 sio->type = f71869a; 442 break; 443 case SIO_F71882_ID: 444 sio->type = f71882fg; 445 break; 446 case SIO_F71889_ID: 447 sio->type = f71889f; 448 break; 449 case SIO_F81866_ID: 450 sio->type = f81866; 451 break; 452 default: 453 pr_info(DRVNAME ": Unsupported Fintek device 0x%04x\n", devid); 454 goto err; 455 } 456 sio->addr = addr; 457 err = 0; 458 459 pr_info(DRVNAME ": Found %s at %#x, revision %d\n", 460 f7188x_names[sio->type], 461 (unsigned int) addr, 462 (int) superio_inb(addr, SIO_DEVREV)); 463 464 err: 465 superio_exit(addr); 466 return err; 467 } 468 469 static struct platform_device *f7188x_gpio_pdev; 470 471 static int __init 472 f7188x_gpio_device_add(const struct f7188x_sio *sio) 473 { 474 int err; 475 476 f7188x_gpio_pdev = platform_device_alloc(DRVNAME, -1); 477 if (!f7188x_gpio_pdev) 478 return -ENOMEM; 479 480 err = platform_device_add_data(f7188x_gpio_pdev, 481 sio, sizeof(*sio)); 482 if (err) { 483 pr_err(DRVNAME "Platform data allocation failed\n"); 484 goto err; 485 } 486 487 err = platform_device_add(f7188x_gpio_pdev); 488 if (err) { 489 pr_err(DRVNAME "Device addition failed\n"); 490 goto err; 491 } 492 493 return 0; 494 495 err: 496 platform_device_put(f7188x_gpio_pdev); 497 498 return err; 499 } 500 501 /* 502 * Try to match a supported Fintek device by reading the (hard-wired) 503 * configuration I/O ports. If available, then register both the platform 504 * device and driver to support the GPIOs. 505 */ 506 507 static struct platform_driver f7188x_gpio_driver = { 508 .driver = { 509 .name = DRVNAME, 510 }, 511 .probe = f7188x_gpio_probe, 512 }; 513 514 static int __init f7188x_gpio_init(void) 515 { 516 int err; 517 struct f7188x_sio sio; 518 519 if (f7188x_find(0x2e, &sio) && 520 f7188x_find(0x4e, &sio)) 521 return -ENODEV; 522 523 err = platform_driver_register(&f7188x_gpio_driver); 524 if (!err) { 525 err = f7188x_gpio_device_add(&sio); 526 if (err) 527 platform_driver_unregister(&f7188x_gpio_driver); 528 } 529 530 return err; 531 } 532 subsys_initcall(f7188x_gpio_init); 533 534 static void __exit f7188x_gpio_exit(void) 535 { 536 platform_device_unregister(f7188x_gpio_pdev); 537 platform_driver_unregister(&f7188x_gpio_driver); 538 } 539 module_exit(f7188x_gpio_exit); 540 541 MODULE_DESCRIPTION("GPIO driver for Super-I/O chips F71869, F71869A, F71882FG, F71889F and F81866"); 542 MODULE_AUTHOR("Simon Guinot <simon.guinot@sequanux.org>"); 543 MODULE_LICENSE("GPL"); 544