drivers/gpio/gpio-f7188x.c

   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");