1 /* 2 * GPIO driver for Fintek Super-I/O F71869, F71869A, F71882 and F71889 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.h> 19 20 #define DRVNAME "gpio-f7188x" 21 22 /* 23 * Super-I/O registers 24 */ 25 #define SIO_LDSEL 0x07 /* Logical device select */ 26 #define SIO_DEVID 0x20 /* Device ID (2 bytes) */ 27 #define SIO_DEVREV 0x22 /* Device revision */ 28 #define SIO_MANID 0x23 /* Fintek ID (2 bytes) */ 29 30 #define SIO_LD_GPIO 0x06 /* GPIO logical device */ 31 #define SIO_UNLOCK_KEY 0x87 /* Key to enable Super-I/O */ 32 #define SIO_LOCK_KEY 0xAA /* Key to disable Super-I/O */ 33 34 #define SIO_FINTEK_ID 0x1934 /* Manufacturer ID */ 35 #define SIO_F71869_ID 0x0814 /* F71869 chipset ID */ 36 #define SIO_F71869A_ID 0x1007 /* F71869A chipset ID */ 37 #define SIO_F71882_ID 0x0541 /* F71882 chipset ID */ 38 #define SIO_F71889_ID 0x0909 /* F71889 chipset ID */ 39 40 enum chips { f71869, f71869a, f71882fg, f71889f }; 41 42 static const char * const f7188x_names[] = { 43 "f71869", 44 "f71869a", 45 "f71882fg", 46 "f71889f", 47 }; 48 49 struct f7188x_sio { 50 int addr; 51 enum chips type; 52 }; 53 54 struct f7188x_gpio_bank { 55 struct gpio_chip chip; 56 unsigned int regbase; 57 struct f7188x_gpio_data *data; 58 }; 59 60 struct f7188x_gpio_data { 61 struct f7188x_sio *sio; 62 int nr_bank; 63 struct f7188x_gpio_bank *bank; 64 }; 65 66 /* 67 * Super-I/O functions. 68 */ 69 70 static inline int superio_inb(int base, int reg) 71 { 72 outb(reg, base); 73 return inb(base + 1); 74 } 75 76 static int superio_inw(int base, int reg) 77 { 78 int val; 79 80 outb(reg++, base); 81 val = inb(base + 1) << 8; 82 outb(reg, base); 83 val |= inb(base + 1); 84 85 return val; 86 } 87 88 static inline void superio_outb(int base, int reg, int val) 89 { 90 outb(reg, base); 91 outb(val, base + 1); 92 } 93 94 static inline int superio_enter(int base) 95 { 96 /* Don't step on other drivers' I/O space by accident. */ 97 if (!request_muxed_region(base, 2, DRVNAME)) { 98 pr_err(DRVNAME "I/O address 0x%04x already in use\n", base); 99 return -EBUSY; 100 } 101 102 /* According to the datasheet the key must be send twice. */ 103 outb(SIO_UNLOCK_KEY, base); 104 outb(SIO_UNLOCK_KEY, base); 105 106 return 0; 107 } 108 109 static inline void superio_select(int base, int ld) 110 { 111 outb(SIO_LDSEL, base); 112 outb(ld, base + 1); 113 } 114 115 static inline void superio_exit(int base) 116 { 117 outb(SIO_LOCK_KEY, base); 118 release_region(base, 2); 119 } 120 121 /* 122 * GPIO chip. 123 */ 124 125 static int f7188x_gpio_direction_in(struct gpio_chip *chip, unsigned offset); 126 static int f7188x_gpio_get(struct gpio_chip *chip, unsigned offset); 127 static int f7188x_gpio_direction_out(struct gpio_chip *chip, 128 unsigned offset, int value); 129 static void f7188x_gpio_set(struct gpio_chip *chip, unsigned offset, int value); 130 131 #define F7188X_GPIO_BANK(_base, _ngpio, _regbase) \ 132 { \ 133 .chip = { \ 134 .label = DRVNAME, \ 135 .owner = THIS_MODULE, \ 136 .direction_input = f7188x_gpio_direction_in, \ 137 .get = f7188x_gpio_get, \ 138 .direction_output = f7188x_gpio_direction_out, \ 139 .set = f7188x_gpio_set, \ 140 .base = _base, \ 141 .ngpio = _ngpio, \ 142 .can_sleep = true, \ 143 }, \ 144 .regbase = _regbase, \ 145 } 146 147 #define gpio_dir(base) (base + 0) 148 #define gpio_data_out(base) (base + 1) 149 #define gpio_data_in(base) (base + 2) 150 /* Output mode register (0:open drain 1:push-pull). */ 151 #define gpio_out_mode(base) (base + 3) 152 153 static struct f7188x_gpio_bank f71869_gpio_bank[] = { 154 F7188X_GPIO_BANK(0, 6, 0xF0), 155 F7188X_GPIO_BANK(10, 8, 0xE0), 156 F7188X_GPIO_BANK(20, 8, 0xD0), 157 F7188X_GPIO_BANK(30, 8, 0xC0), 158 F7188X_GPIO_BANK(40, 8, 0xB0), 159 F7188X_GPIO_BANK(50, 5, 0xA0), 160 F7188X_GPIO_BANK(60, 6, 0x90), 161 }; 162 163 static struct f7188x_gpio_bank f71869a_gpio_bank[] = { 164 F7188X_GPIO_BANK(0, 6, 0xF0), 165 F7188X_GPIO_BANK(10, 8, 0xE0), 166 F7188X_GPIO_BANK(20, 8, 0xD0), 167 F7188X_GPIO_BANK(30, 8, 0xC0), 168 F7188X_GPIO_BANK(40, 8, 0xB0), 169 F7188X_GPIO_BANK(50, 5, 0xA0), 170 F7188X_GPIO_BANK(60, 8, 0x90), 171 F7188X_GPIO_BANK(70, 8, 0x80), 172 }; 173 174 static struct f7188x_gpio_bank f71882_gpio_bank[] = { 175 F7188X_GPIO_BANK(0, 8, 0xF0), 176 F7188X_GPIO_BANK(10, 8, 0xE0), 177 F7188X_GPIO_BANK(20, 8, 0xD0), 178 F7188X_GPIO_BANK(30, 4, 0xC0), 179 F7188X_GPIO_BANK(40, 4, 0xB0), 180 }; 181 182 static struct f7188x_gpio_bank f71889_gpio_bank[] = { 183 F7188X_GPIO_BANK(0, 7, 0xF0), 184 F7188X_GPIO_BANK(10, 7, 0xE0), 185 F7188X_GPIO_BANK(20, 8, 0xD0), 186 F7188X_GPIO_BANK(30, 8, 0xC0), 187 F7188X_GPIO_BANK(40, 8, 0xB0), 188 F7188X_GPIO_BANK(50, 5, 0xA0), 189 F7188X_GPIO_BANK(60, 8, 0x90), 190 F7188X_GPIO_BANK(70, 8, 0x80), 191 }; 192 193 static int f7188x_gpio_direction_in(struct gpio_chip *chip, unsigned offset) 194 { 195 int err; 196 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 197 struct f7188x_sio *sio = bank->data->sio; 198 u8 dir; 199 200 err = superio_enter(sio->addr); 201 if (err) 202 return err; 203 superio_select(sio->addr, SIO_LD_GPIO); 204 205 dir = superio_inb(sio->addr, gpio_dir(bank->regbase)); 206 dir &= ~(1 << offset); 207 superio_outb(sio->addr, gpio_dir(bank->regbase), dir); 208 209 superio_exit(sio->addr); 210 211 return 0; 212 } 213 214 static int f7188x_gpio_get(struct gpio_chip *chip, unsigned offset) 215 { 216 int err; 217 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 218 struct f7188x_sio *sio = bank->data->sio; 219 u8 dir, data; 220 221 err = superio_enter(sio->addr); 222 if (err) 223 return err; 224 superio_select(sio->addr, SIO_LD_GPIO); 225 226 dir = superio_inb(sio->addr, gpio_dir(bank->regbase)); 227 dir = !!(dir & (1 << offset)); 228 if (dir) 229 data = superio_inb(sio->addr, gpio_data_out(bank->regbase)); 230 else 231 data = superio_inb(sio->addr, gpio_data_in(bank->regbase)); 232 233 superio_exit(sio->addr); 234 235 return !!(data & 1 << offset); 236 } 237 238 static int f7188x_gpio_direction_out(struct gpio_chip *chip, 239 unsigned offset, int value) 240 { 241 int err; 242 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 243 struct f7188x_sio *sio = bank->data->sio; 244 u8 dir, data_out; 245 246 err = superio_enter(sio->addr); 247 if (err) 248 return err; 249 superio_select(sio->addr, SIO_LD_GPIO); 250 251 data_out = superio_inb(sio->addr, gpio_data_out(bank->regbase)); 252 if (value) 253 data_out |= (1 << offset); 254 else 255 data_out &= ~(1 << offset); 256 superio_outb(sio->addr, gpio_data_out(bank->regbase), data_out); 257 258 dir = superio_inb(sio->addr, gpio_dir(bank->regbase)); 259 dir |= (1 << offset); 260 superio_outb(sio->addr, gpio_dir(bank->regbase), dir); 261 262 superio_exit(sio->addr); 263 264 return 0; 265 } 266 267 static void f7188x_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 268 { 269 int err; 270 struct f7188x_gpio_bank *bank = gpiochip_get_data(chip); 271 struct f7188x_sio *sio = bank->data->sio; 272 u8 data_out; 273 274 err = superio_enter(sio->addr); 275 if (err) 276 return; 277 superio_select(sio->addr, SIO_LD_GPIO); 278 279 data_out = superio_inb(sio->addr, gpio_data_out(bank->regbase)); 280 if (value) 281 data_out |= (1 << offset); 282 else 283 data_out &= ~(1 << offset); 284 superio_outb(sio->addr, gpio_data_out(bank->regbase), data_out); 285 286 superio_exit(sio->addr); 287 } 288 289 /* 290 * Platform device and driver. 291 */ 292 293 static int f7188x_gpio_probe(struct platform_device *pdev) 294 { 295 int err; 296 int i; 297 struct f7188x_sio *sio = dev_get_platdata(&pdev->dev); 298 struct f7188x_gpio_data *data; 299 300 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 301 if (!data) 302 return -ENOMEM; 303 304 switch (sio->type) { 305 case f71869: 306 data->nr_bank = ARRAY_SIZE(f71869_gpio_bank); 307 data->bank = f71869_gpio_bank; 308 break; 309 case f71869a: 310 data->nr_bank = ARRAY_SIZE(f71869a_gpio_bank); 311 data->bank = f71869a_gpio_bank; 312 break; 313 case f71882fg: 314 data->nr_bank = ARRAY_SIZE(f71882_gpio_bank); 315 data->bank = f71882_gpio_bank; 316 break; 317 case f71889f: 318 data->nr_bank = ARRAY_SIZE(f71889_gpio_bank); 319 data->bank = f71889_gpio_bank; 320 break; 321 default: 322 return -ENODEV; 323 } 324 data->sio = sio; 325 326 platform_set_drvdata(pdev, data); 327 328 /* For each GPIO bank, register a GPIO chip. */ 329 for (i = 0; i < data->nr_bank; i++) { 330 struct f7188x_gpio_bank *bank = &data->bank[i]; 331 332 bank->chip.parent = &pdev->dev; 333 bank->data = data; 334 335 err = gpiochip_add_data(&bank->chip, bank); 336 if (err) { 337 dev_err(&pdev->dev, 338 "Failed to register gpiochip %d: %d\n", 339 i, err); 340 goto err_gpiochip; 341 } 342 } 343 344 return 0; 345 346 err_gpiochip: 347 for (i = i - 1; i >= 0; i--) { 348 struct f7188x_gpio_bank *bank = &data->bank[i]; 349 gpiochip_remove(&bank->chip); 350 } 351 352 return err; 353 } 354 355 static int f7188x_gpio_remove(struct platform_device *pdev) 356 { 357 int i; 358 struct f7188x_gpio_data *data = platform_get_drvdata(pdev); 359 360 for (i = 0; i < data->nr_bank; i++) { 361 struct f7188x_gpio_bank *bank = &data->bank[i]; 362 gpiochip_remove(&bank->chip); 363 } 364 365 return 0; 366 } 367 368 static int __init f7188x_find(int addr, struct f7188x_sio *sio) 369 { 370 int err; 371 u16 devid; 372 373 err = superio_enter(addr); 374 if (err) 375 return err; 376 377 err = -ENODEV; 378 devid = superio_inw(addr, SIO_MANID); 379 if (devid != SIO_FINTEK_ID) { 380 pr_debug(DRVNAME ": Not a Fintek device at 0x%08x\n", addr); 381 goto err; 382 } 383 384 devid = superio_inw(addr, SIO_DEVID); 385 switch (devid) { 386 case SIO_F71869_ID: 387 sio->type = f71869; 388 break; 389 case SIO_F71869A_ID: 390 sio->type = f71869a; 391 break; 392 case SIO_F71882_ID: 393 sio->type = f71882fg; 394 break; 395 case SIO_F71889_ID: 396 sio->type = f71889f; 397 break; 398 default: 399 pr_info(DRVNAME ": Unsupported Fintek device 0x%04x\n", devid); 400 goto err; 401 } 402 sio->addr = addr; 403 err = 0; 404 405 pr_info(DRVNAME ": Found %s at %#x, revision %d\n", 406 f7188x_names[sio->type], 407 (unsigned int) addr, 408 (int) superio_inb(addr, SIO_DEVREV)); 409 410 err: 411 superio_exit(addr); 412 return err; 413 } 414 415 static struct platform_device *f7188x_gpio_pdev; 416 417 static int __init 418 f7188x_gpio_device_add(const struct f7188x_sio *sio) 419 { 420 int err; 421 422 f7188x_gpio_pdev = platform_device_alloc(DRVNAME, -1); 423 if (!f7188x_gpio_pdev) 424 return -ENOMEM; 425 426 err = platform_device_add_data(f7188x_gpio_pdev, 427 sio, sizeof(*sio)); 428 if (err) { 429 pr_err(DRVNAME "Platform data allocation failed\n"); 430 goto err; 431 } 432 433 err = platform_device_add(f7188x_gpio_pdev); 434 if (err) { 435 pr_err(DRVNAME "Device addition failed\n"); 436 goto err; 437 } 438 439 return 0; 440 441 err: 442 platform_device_put(f7188x_gpio_pdev); 443 444 return err; 445 } 446 447 /* 448 * Try to match a supported Fintek device by reading the (hard-wired) 449 * configuration I/O ports. If available, then register both the platform 450 * device and driver to support the GPIOs. 451 */ 452 453 static struct platform_driver f7188x_gpio_driver = { 454 .driver = { 455 .name = DRVNAME, 456 }, 457 .probe = f7188x_gpio_probe, 458 .remove = f7188x_gpio_remove, 459 }; 460 461 static int __init f7188x_gpio_init(void) 462 { 463 int err; 464 struct f7188x_sio sio; 465 466 if (f7188x_find(0x2e, &sio) && 467 f7188x_find(0x4e, &sio)) 468 return -ENODEV; 469 470 err = platform_driver_register(&f7188x_gpio_driver); 471 if (!err) { 472 err = f7188x_gpio_device_add(&sio); 473 if (err) 474 platform_driver_unregister(&f7188x_gpio_driver); 475 } 476 477 return err; 478 } 479 subsys_initcall(f7188x_gpio_init); 480 481 static void __exit f7188x_gpio_exit(void) 482 { 483 platform_device_unregister(f7188x_gpio_pdev); 484 platform_driver_unregister(&f7188x_gpio_driver); 485 } 486 module_exit(f7188x_gpio_exit); 487 488 MODULE_DESCRIPTION("GPIO driver for Super-I/O chips F71869, F71869A, F71882FG and F71889F"); 489 MODULE_AUTHOR("Simon Guinot <simon.guinot@sequanux.org>"); 490 MODULE_LICENSE("GPL"); 491