drivers/gpio/gpio-mcp23s08.c

   1 /*
   2  * MCP23S08 SPI/GPIO gpio expander driver
   3  */
   4
   5 #include <linux/kernel.h>
   6 #include <linux/device.h>
   7 #include <linux/mutex.h>
   8 #include <linux/gpio.h>
   9 #include <linux/i2c.h>
  10 #include <linux/spi/spi.h>
  11 #include <linux/spi/mcp23s08.h>
  12 #include <linux/slab.h>
  13 #include <asm/byteorder.h>
  14
  15 /**
  16  * MCP types supported by driver
  17  */
  18 #define MCP_TYPE_S08    0
  19 #define MCP_TYPE_S17    1
  20 #define MCP_TYPE_008    2
  21 #define MCP_TYPE_017    3
  22
  23 /* Registers are all 8 bits wide.
  24  *
  25  * The mcp23s17 has twice as many bits, and can be configured to work
  26  * with either 16 bit registers or with two adjacent 8 bit banks.
  27  */
  28 #define MCP_IODIR       0x00            /* init/reset:  all ones */
  29 #define MCP_IPOL        0x01
  30 #define MCP_GPINTEN     0x02
  31 #define MCP_DEFVAL      0x03
  32 #define MCP_INTCON      0x04
  33 #define MCP_IOCON       0x05
  34 #       define IOCON_SEQOP      (1 << 5)
  35 #       define IOCON_HAEN       (1 << 3)
  36 #       define IOCON_ODR        (1 << 2)
  37 #       define IOCON_INTPOL     (1 << 1)
  38 #define MCP_GPPU        0x06
  39 #define MCP_INTF        0x07
  40 #define MCP_INTCAP      0x08
  41 #define MCP_GPIO        0x09
  42 #define MCP_OLAT        0x0a
  43
  44 struct mcp23s08;
  45
  46 struct mcp23s08_ops {
  47         int     (*read)(struct mcp23s08 *mcp, unsigned reg);
  48         int     (*write)(struct mcp23s08 *mcp, unsigned reg, unsigned val);
  49         int     (*read_regs)(struct mcp23s08 *mcp, unsigned reg,
  50                              u16 *vals, unsigned n);
  51 };
  52
  53 struct mcp23s08 {
  54         u8                      addr;
  55
  56         u16                     cache[11];
  57         /* lock protects the cached values */
  58         struct mutex            lock;
  59
  60         struct gpio_chip        chip;
  61
  62         const struct mcp23s08_ops       *ops;
  63         void                    *data; /* ops specific data */
  64 };
  65
  66 /* A given spi_device can represent up to eight mcp23sxx chips
  67  * sharing the same chipselect but using different addresses
  68  * (e.g. chips #0 and #3 might be populated, but not #1 or $2).
  69  * Driver data holds all the per-chip data.
  70  */
  71 struct mcp23s08_driver_data {
  72         unsigned                ngpio;
  73         struct mcp23s08         *mcp[8];
  74         struct mcp23s08         chip[];
  75 };
  76
  77 /*----------------------------------------------------------------------*/
  78
  79 #ifdef CONFIG_I2C
  80
  81 static int mcp23008_read(struct mcp23s08 *mcp, unsigned reg)
  82 {
  83         return i2c_smbus_read_byte_data(mcp->data, reg);
  84 }
  85
  86 static int mcp23008_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
  87 {
  88         return i2c_smbus_write_byte_data(mcp->data, reg, val);
  89 }
  90
  91 static int
  92 mcp23008_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
  93 {
  94         while (n--) {
  95                 int ret = mcp23008_read(mcp, reg++);
  96                 if (ret < 0)
  97                         return ret;
  98                 *vals++ = ret;
  99         }
 100
 101         return 0;
 102 }
 103
 104 static int mcp23017_read(struct mcp23s08 *mcp, unsigned reg)
 105 {
 106         return i2c_smbus_read_word_data(mcp->data, reg << 1);
 107 }
 108
 109 static int mcp23017_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
 110 {
 111         return i2c_smbus_write_word_data(mcp->data, reg << 1, val);
 112 }
 113
 114 static int
 115 mcp23017_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
 116 {
 117         while (n--) {
 118                 int ret = mcp23017_read(mcp, reg++);
 119                 if (ret < 0)
 120                         return ret;
 121                 *vals++ = ret;
 122         }
 123
 124         return 0;
 125 }
 126
 127 static const struct mcp23s08_ops mcp23008_ops = {
 128         .read           = mcp23008_read,
 129         .write          = mcp23008_write,
 130         .read_regs      = mcp23008_read_regs,
 131 };
 132
 133 static const struct mcp23s08_ops mcp23017_ops = {
 134         .read           = mcp23017_read,
 135         .write          = mcp23017_write,
 136         .read_regs      = mcp23017_read_regs,
 137 };
 138
 139 #endif /* CONFIG_I2C */
 140
 141 /*----------------------------------------------------------------------*/
 142
 143 #ifdef CONFIG_SPI_MASTER
 144
 145 static int mcp23s08_read(struct mcp23s08 *mcp, unsigned reg)
 146 {
 147         u8      tx[2], rx[1];
 148         int     status;
 149
 150         tx[0] = mcp->addr | 0x01;
 151         tx[1] = reg;
 152         status = spi_write_then_read(mcp->data, tx, sizeof tx, rx, sizeof rx);
 153         return (status < 0) ? status : rx[0];
 154 }
 155
 156 static int mcp23s08_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
 157 {
 158         u8      tx[3];
 159
 160         tx[0] = mcp->addr;
 161         tx[1] = reg;
 162         tx[2] = val;
 163         return spi_write_then_read(mcp->data, tx, sizeof tx, NULL, 0);
 164 }
 165
 166 static int
 167 mcp23s08_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
 168 {
 169         u8      tx[2], *tmp;
 170         int     status;
 171
 172         if ((n + reg) > sizeof mcp->cache)
 173                 return -EINVAL;
 174         tx[0] = mcp->addr | 0x01;
 175         tx[1] = reg;
 176
 177         tmp = (u8 *)vals;
 178         status = spi_write_then_read(mcp->data, tx, sizeof tx, tmp, n);
 179         if (status >= 0) {
 180                 while (n--)
 181                         vals[n] = tmp[n]; /* expand to 16bit */
 182         }
 183         return status;
 184 }
 185
 186 static int mcp23s17_read(struct mcp23s08 *mcp, unsigned reg)
 187 {
 188         u8      tx[2], rx[2];
 189         int     status;
 190
 191         tx[0] = mcp->addr | 0x01;
 192         tx[1] = reg << 1;
 193         status = spi_write_then_read(mcp->data, tx, sizeof tx, rx, sizeof rx);
 194         return (status < 0) ? status : (rx[0] | (rx[1] << 8));
 195 }
 196
 197 static int mcp23s17_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
 198 {
 199         u8      tx[4];
 200
 201         tx[0] = mcp->addr;
 202         tx[1] = reg << 1;
 203         tx[2] = val;
 204         tx[3] = val >> 8;
 205         return spi_write_then_read(mcp->data, tx, sizeof tx, NULL, 0);
 206 }
 207
 208 static int
 209 mcp23s17_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
 210 {
 211         u8      tx[2];
 212         int     status;
 213
 214         if ((n + reg) > sizeof mcp->cache)
 215                 return -EINVAL;
 216         tx[0] = mcp->addr | 0x01;
 217         tx[1] = reg << 1;
 218
 219         status = spi_write_then_read(mcp->data, tx, sizeof tx,
 220                                      (u8 *)vals, n * 2);
 221         if (status >= 0) {
 222                 while (n--)
 223                         vals[n] = __le16_to_cpu((__le16)vals[n]);
 224         }
 225
 226         return status;
 227 }
 228
 229 static const struct mcp23s08_ops mcp23s08_ops = {
 230         .read           = mcp23s08_read,
 231         .write          = mcp23s08_write,
 232         .read_regs      = mcp23s08_read_regs,
 233 };
 234
 235 static const struct mcp23s08_ops mcp23s17_ops = {
 236         .read           = mcp23s17_read,
 237         .write          = mcp23s17_write,
 238         .read_regs      = mcp23s17_read_regs,
 239 };
 240
 241 #endif /* CONFIG_SPI_MASTER */
 242
 243 /*----------------------------------------------------------------------*/
 244
 245 static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset)
 246 {
 247         struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
 248         int status;
 249
 250         mutex_lock(&mcp->lock);
 251         mcp->cache[MCP_IODIR] |= (1 << offset);
 252         status = mcp->ops->write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]);
 253         mutex_unlock(&mcp->lock);
 254         return status;
 255 }
 256
 257 static int mcp23s08_get(struct gpio_chip *chip, unsigned offset)
 258 {
 259         struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
 260         int status;
 261
 262         mutex_lock(&mcp->lock);
 263
 264         /* REVISIT reading this clears any IRQ ... */
 265         status = mcp->ops->read(mcp, MCP_GPIO);
 266         if (status < 0)
 267                 status = 0;
 268         else {
 269                 mcp->cache[MCP_GPIO] = status;
 270                 status = !!(status & (1 << offset));
 271         }
 272         mutex_unlock(&mcp->lock);
 273         return status;
 274 }
 275
 276 static int __mcp23s08_set(struct mcp23s08 *mcp, unsigned mask, int value)
 277 {
 278         unsigned olat = mcp->cache[MCP_OLAT];
 279
 280         if (value)
 281                 olat |= mask;
 282         else
 283                 olat &= ~mask;
 284         mcp->cache[MCP_OLAT] = olat;
 285         return mcp->ops->write(mcp, MCP_OLAT, olat);
 286 }
 287
 288 static void mcp23s08_set(struct gpio_chip *chip, unsigned offset, int value)
 289 {
 290         struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
 291         unsigned mask = 1 << offset;
 292
 293         mutex_lock(&mcp->lock);
 294         __mcp23s08_set(mcp, mask, value);
 295         mutex_unlock(&mcp->lock);
 296 }
 297
 298 static int
 299 mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value)
 300 {
 301         struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
 302         unsigned mask = 1 << offset;
 303         int status;
 304
 305         mutex_lock(&mcp->lock);
 306         status = __mcp23s08_set(mcp, mask, value);
 307         if (status == 0) {
 308                 mcp->cache[MCP_IODIR] &= ~mask;
 309                 status = mcp->ops->write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]);
 310         }
 311         mutex_unlock(&mcp->lock);
 312         return status;
 313 }
 314
 315 /*----------------------------------------------------------------------*/
 316
 317 #ifdef CONFIG_DEBUG_FS
 318
 319 #include <linux/seq_file.h>
 320
 321 /*
 322  * This shows more info than the generic gpio dump code:
 323  * pullups, deglitching, open drain drive.
 324  */
 325 static void mcp23s08_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 326 {
 327         struct mcp23s08 *mcp;
 328         char            bank;
 329         int             t;
 330         unsigned        mask;
 331
 332         mcp = container_of(chip, struct mcp23s08, chip);
 333
 334         /* NOTE: we only handle one bank for now ... */
 335         bank = '0' + ((mcp->addr >> 1) & 0x7);
 336
 337         mutex_lock(&mcp->lock);
 338         t = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
 339         if (t < 0) {
 340                 seq_printf(s, " I/O ERROR %d\n", t);
 341                 goto done;
 342         }
 343
 344         for (t = 0, mask = 1; t < chip->ngpio; t++, mask <<= 1) {
 345                 const char      *label;
 346
 347                 label = gpiochip_is_requested(chip, t);
 348                 if (!label)
 349                         continue;
 350
 351                 seq_printf(s, " gpio-%-3d P%c.%d (%-12s) %s %s %s",
 352                         chip->base + t, bank, t, label,
 353                         (mcp->cache[MCP_IODIR] & mask) ? "in " : "out",
 354                         (mcp->cache[MCP_GPIO] & mask) ? "hi" : "lo",
 355                         (mcp->cache[MCP_GPPU] & mask) ? "  " : "up");
 356                 /* NOTE:  ignoring the irq-related registers */
 357                 seq_printf(s, "\n");
 358         }
 359 done:
 360         mutex_unlock(&mcp->lock);
 361 }
 362
 363 #else
 364 #define mcp23s08_dbg_show       NULL
 365 #endif
 366
 367 /*----------------------------------------------------------------------*/
 368
 369 static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
 370                               void *data, unsigned addr,
 371                               unsigned type, unsigned base, unsigned pullups)
 372 {
 373         int status;
 374
 375         mutex_init(&mcp->lock);
 376
 377         mcp->data = data;
 378         mcp->addr = addr;
 379
 380         mcp->chip.direction_input = mcp23s08_direction_input;
 381         mcp->chip.get = mcp23s08_get;
 382         mcp->chip.direction_output = mcp23s08_direction_output;
 383         mcp->chip.set = mcp23s08_set;
 384         mcp->chip.dbg_show = mcp23s08_dbg_show;
 385
 386         switch (type) {
 387 #ifdef CONFIG_SPI_MASTER
 388         case MCP_TYPE_S08:
 389                 mcp->ops = &mcp23s08_ops;
 390                 mcp->chip.ngpio = 8;
 391                 mcp->chip.label = "mcp23s08";
 392                 break;
 393
 394         case MCP_TYPE_S17:
 395                 mcp->ops = &mcp23s17_ops;
 396                 mcp->chip.ngpio = 16;
 397                 mcp->chip.label = "mcp23s17";
 398                 break;
 399 #endif /* CONFIG_SPI_MASTER */
 400
 401 #ifdef CONFIG_I2C
 402         case MCP_TYPE_008:
 403                 mcp->ops = &mcp23008_ops;
 404                 mcp->chip.ngpio = 8;
 405                 mcp->chip.label = "mcp23008";
 406                 break;
 407
 408         case MCP_TYPE_017:
 409                 mcp->ops = &mcp23017_ops;
 410                 mcp->chip.ngpio = 16;
 411                 mcp->chip.label = "mcp23017";
 412                 break;
 413 #endif /* CONFIG_I2C */
 414
 415         default:
 416                 dev_err(dev, "invalid device type (%d)\n", type);
 417                 return -EINVAL;
 418         }
 419
 420         mcp->chip.base = base;
 421         mcp->chip.can_sleep = 1;
 422         mcp->chip.dev = dev;
 423         mcp->chip.owner = THIS_MODULE;
 424
 425         /* verify MCP_IOCON.SEQOP = 0, so sequential reads work,
 426          * and MCP_IOCON.HAEN = 1, so we work with all chips.
 427          */
 428         status = mcp->ops->read(mcp, MCP_IOCON);
 429         if (status < 0)
 430                 goto fail;
 431         if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN)) {
 432                 /* mcp23s17 has IOCON twice, make sure they are in sync */
 433                 status &= ~(IOCON_SEQOP | (IOCON_SEQOP << 8));
 434                 status |= IOCON_HAEN | (IOCON_HAEN << 8);
 435                 status = mcp->ops->write(mcp, MCP_IOCON, status);
 436                 if (status < 0)
 437                         goto fail;
 438         }
 439
 440         /* configure ~100K pullups */
 441         status = mcp->ops->write(mcp, MCP_GPPU, pullups);
 442         if (status < 0)
 443                 goto fail;
 444
 445         status = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
 446         if (status < 0)
 447                 goto fail;
 448
 449         /* disable inverter on input */
 450         if (mcp->cache[MCP_IPOL] != 0) {
 451                 mcp->cache[MCP_IPOL] = 0;
 452                 status = mcp->ops->write(mcp, MCP_IPOL, 0);
 453                 if (status < 0)
 454                         goto fail;
 455         }
 456
 457         /* disable irqs */
 458         if (mcp->cache[MCP_GPINTEN] != 0) {
 459                 mcp->cache[MCP_GPINTEN] = 0;
 460                 status = mcp->ops->write(mcp, MCP_GPINTEN, 0);
 461                 if (status < 0)
 462                         goto fail;
 463         }
 464
 465         status = gpiochip_add(&mcp->chip);
 466 fail:
 467         if (status < 0)
 468                 dev_dbg(dev, "can't setup chip %d, --> %d\n",
 469                         addr, status);
 470         return status;
 471 }
 472
 473 /*----------------------------------------------------------------------*/
 474
 475 #ifdef CONFIG_I2C
 476
 477 static int __devinit mcp230xx_probe(struct i2c_client *client,
 478                                     const struct i2c_device_id *id)
 479 {
 480         struct mcp23s08_platform_data *pdata;
 481         struct mcp23s08 *mcp;
 482         int status;
 483
 484         pdata = client->dev.platform_data;
 485         if (!pdata || !gpio_is_valid(pdata->base)) {
 486                 dev_dbg(&client->dev, "invalid or missing platform data\n");
 487                 return -EINVAL;
 488         }
 489
 490         mcp = kzalloc(sizeof *mcp, GFP_KERNEL);
 491         if (!mcp)
 492                 return -ENOMEM;
 493
 494         status = mcp23s08_probe_one(mcp, &client->dev, client, client->addr,
 495                                     id->driver_data, pdata->base,
 496                                     pdata->chip[0].pullups);
 497         if (status)
 498                 goto fail;
 499
 500         i2c_set_clientdata(client, mcp);
 501
 502         return 0;
 503
 504 fail:
 505         kfree(mcp);
 506
 507         return status;
 508 }
 509
 510 static int __devexit mcp230xx_remove(struct i2c_client *client)
 511 {
 512         struct mcp23s08 *mcp = i2c_get_clientdata(client);
 513         int status;
 514
 515         status = gpiochip_remove(&mcp->chip);
 516         if (status == 0)
 517                 kfree(mcp);
 518
 519         return status;
 520 }
 521
 522 static const struct i2c_device_id mcp230xx_id[] = {
 523         { "mcp23008", MCP_TYPE_008 },
 524         { "mcp23017", MCP_TYPE_017 },
 525         { },
 526 };
 527 MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
 528
 529 static struct i2c_driver mcp230xx_driver = {
 530         .driver = {
 531                 .name   = "mcp230xx",
 532                 .owner  = THIS_MODULE,
 533         },
 534         .probe          = mcp230xx_probe,
 535         .remove         = __devexit_p(mcp230xx_remove),
 536         .id_table       = mcp230xx_id,
 537 };
 538
 539 static int __init mcp23s08_i2c_init(void)
 540 {
 541         return i2c_add_driver(&mcp230xx_driver);
 542 }
 543
 544 static void mcp23s08_i2c_exit(void)
 545 {
 546         i2c_del_driver(&mcp230xx_driver);
 547 }
 548
 549 #else
 550
 551 static int __init mcp23s08_i2c_init(void) { return 0; }
 552 static void mcp23s08_i2c_exit(void) { }
 553
 554 #endif /* CONFIG_I2C */
 555
 556 /*----------------------------------------------------------------------*/
 557
 558 #ifdef CONFIG_SPI_MASTER
 559
 560 static int mcp23s08_probe(struct spi_device *spi)
 561 {
 562         struct mcp23s08_platform_data   *pdata;
 563         unsigned                        addr;
 564         unsigned                        chips = 0;
 565         struct mcp23s08_driver_data     *data;
 566         int                             status, type;
 567         unsigned                        base;
 568
 569         type = spi_get_device_id(spi)->driver_data;
 570
 571         pdata = spi->dev.platform_data;
 572         if (!pdata || !gpio_is_valid(pdata->base)) {
 573                 dev_dbg(&spi->dev, "invalid or missing platform data\n");
 574                 return -EINVAL;
 575         }
 576
 577         for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
 578                 if (!pdata->chip[addr].is_present)
 579                         continue;
 580                 chips++;
 581                 if ((type == MCP_TYPE_S08) && (addr > 3)) {
 582                         dev_err(&spi->dev,
 583                                 "mcp23s08 only supports address 0..3\n");
 584                         return -EINVAL;
 585                 }
 586         }
 587         if (!chips)
 588                 return -ENODEV;
 589
 590         data = kzalloc(sizeof *data + chips * sizeof(struct mcp23s08),
 591                         GFP_KERNEL);
 592         if (!data)
 593                 return -ENOMEM;
 594         spi_set_drvdata(spi, data);
 595
 596         base = pdata->base;
 597         for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
 598                 if (!pdata->chip[addr].is_present)
 599                         continue;
 600                 chips--;
 601                 data->mcp[addr] = &data->chip[chips];
 602                 status = mcp23s08_probe_one(data->mcp[addr], &spi->dev, spi,
 603                                             0x40 | (addr << 1), type, base,
 604                                             pdata->chip[addr].pullups);
 605                 if (status < 0)
 606                         goto fail;
 607
 608                 base += (type == MCP_TYPE_S17) ? 16 : 8;
 609         }
 610         data->ngpio = base - pdata->base;
 611
 612         /* NOTE:  these chips have a relatively sane IRQ framework, with
 613          * per-signal masking and level/edge triggering.  It's not yet
 614          * handled here...
 615          */
 616
 617         return 0;
 618
 619 fail:
 620         for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
 621                 int tmp;
 622
 623                 if (!data->mcp[addr])
 624                         continue;
 625                 tmp = gpiochip_remove(&data->mcp[addr]->chip);
 626                 if (tmp < 0)
 627                         dev_err(&spi->dev, "%s --> %d\n", "remove", tmp);
 628         }
 629         kfree(data);
 630         return status;
 631 }
 632
 633 static int mcp23s08_remove(struct spi_device *spi)
 634 {
 635         struct mcp23s08_driver_data     *data = spi_get_drvdata(spi);
 636         unsigned                        addr;
 637         int                             status = 0;
 638
 639         for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
 640                 int tmp;
 641
 642                 if (!data->mcp[addr])
 643                         continue;
 644
 645                 tmp = gpiochip_remove(&data->mcp[addr]->chip);
 646                 if (tmp < 0) {
 647                         dev_err(&spi->dev, "%s --> %d\n", "remove", tmp);
 648                         status = tmp;
 649                 }
 650         }
 651         if (status == 0)
 652                 kfree(data);
 653         return status;
 654 }
 655
 656 static const struct spi_device_id mcp23s08_ids[] = {
 657         { "mcp23s08", MCP_TYPE_S08 },
 658         { "mcp23s17", MCP_TYPE_S17 },
 659         { },
 660 };
 661 MODULE_DEVICE_TABLE(spi, mcp23s08_ids);
 662
 663 static struct spi_driver mcp23s08_driver = {
 664         .probe          = mcp23s08_probe,
 665         .remove         = mcp23s08_remove,
 666         .id_table       = mcp23s08_ids,
 667         .driver = {
 668                 .name   = "mcp23s08",
 669                 .owner  = THIS_MODULE,
 670         },
 671 };
 672
 673 static int __init mcp23s08_spi_init(void)
 674 {
 675         return spi_register_driver(&mcp23s08_driver);
 676 }
 677
 678 static void mcp23s08_spi_exit(void)
 679 {
 680         spi_unregister_driver(&mcp23s08_driver);
 681 }
 682
 683 #else
 684
 685 static int __init mcp23s08_spi_init(void) { return 0; }
 686 static void mcp23s08_spi_exit(void) { }
 687
 688 #endif /* CONFIG_SPI_MASTER */
 689
 690 /*----------------------------------------------------------------------*/
 691
 692 static int __init mcp23s08_init(void)
 693 {
 694         int ret;
 695
 696         ret = mcp23s08_spi_init();
 697         if (ret)
 698                 goto spi_fail;
 699
 700         ret = mcp23s08_i2c_init();
 701         if (ret)
 702                 goto i2c_fail;
 703
 704         return 0;
 705
 706  i2c_fail:
 707         mcp23s08_spi_exit();
 708  spi_fail:
 709         return ret;
 710 }
 711 /* register after spi/i2c postcore initcall and before
 712  * subsys initcalls that may rely on these GPIOs
 713  */
 714 subsys_initcall(mcp23s08_init);
 715
 716 static void __exit mcp23s08_exit(void)
 717 {
 718         mcp23s08_spi_exit();
 719         mcp23s08_i2c_exit();
 720 }
 721 module_exit(mcp23s08_exit);
 722
 723 MODULE_LICENSE("GPL");