drivers/gpio/gpio-sx150x.c

   1 /* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  15  * 02110-1301, USA.
  16  */
  17 #include <linux/gpio.h>
  18 #include <linux/i2c.h>
  19 #include <linux/init.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/irq.h>
  22 #include <linux/module.h>
  23 #include <linux/mutex.h>
  24 #include <linux/slab.h>
  25 #include <linux/i2c/sx150x.h>
  26 #include <linux/of.h>
  27 #include <linux/of_address.h>
  28 #include <linux/of_irq.h>
  29 #include <linux/of_gpio.h>
  30 #include <linux/of_device.h>
  31
  32 #define NO_UPDATE_PENDING       -1
  33
  34 /* The chip models of sx150x */
  35 #define SX150X_456 0
  36 #define SX150X_789 1
  37
  38 struct sx150x_456_pri {
  39         u8 reg_pld_mode;
  40         u8 reg_pld_table0;
  41         u8 reg_pld_table1;
  42         u8 reg_pld_table2;
  43         u8 reg_pld_table3;
  44         u8 reg_pld_table4;
  45         u8 reg_advance;
  46 };
  47
  48 struct sx150x_789_pri {
  49         u8 reg_drain;
  50         u8 reg_polarity;
  51         u8 reg_clock;
  52         u8 reg_misc;
  53         u8 reg_reset;
  54         u8 ngpios;
  55 };
  56
  57 struct sx150x_device_data {
  58         u8 model;
  59         u8 reg_pullup;
  60         u8 reg_pulldn;
  61         u8 reg_dir;
  62         u8 reg_data;
  63         u8 reg_irq_mask;
  64         u8 reg_irq_src;
  65         u8 reg_sense;
  66         u8 ngpios;
  67         union {
  68                 struct sx150x_456_pri x456;
  69                 struct sx150x_789_pri x789;
  70         } pri;
  71 };
  72
  73 struct sx150x_chip {
  74         struct gpio_chip                 gpio_chip;
  75         struct i2c_client               *client;
  76         const struct sx150x_device_data *dev_cfg;
  77         int                              irq_summary;
  78         int                              irq_base;
  79         int                              irq_update;
  80         u32                              irq_sense;
  81         u32                              irq_masked;
  82         u32                              dev_sense;
  83         u32                              dev_masked;
  84         struct irq_chip                  irq_chip;
  85         struct mutex                     lock;
  86 };
  87
  88 static const struct sx150x_device_data sx150x_devices[] = {
  89         [0] = { /* sx1508q */
  90                 .model = SX150X_789,
  91                 .reg_pullup     = 0x03,
  92                 .reg_pulldn     = 0x04,
  93                 .reg_dir        = 0x07,
  94                 .reg_data       = 0x08,
  95                 .reg_irq_mask   = 0x09,
  96                 .reg_irq_src    = 0x0c,
  97                 .reg_sense      = 0x0b,
  98                 .pri.x789 = {
  99                         .reg_drain      = 0x05,
 100                         .reg_polarity   = 0x06,
 101                         .reg_clock      = 0x0f,
 102                         .reg_misc       = 0x10,
 103                         .reg_reset      = 0x7d,
 104                 },
 105                 .ngpios = 8,
 106         },
 107         [1] = { /* sx1509q */
 108                 .model = SX150X_789,
 109                 .reg_pullup     = 0x07,
 110                 .reg_pulldn     = 0x09,
 111                 .reg_dir        = 0x0f,
 112                 .reg_data       = 0x11,
 113                 .reg_irq_mask   = 0x13,
 114                 .reg_irq_src    = 0x19,
 115                 .reg_sense      = 0x17,
 116                 .pri.x789 = {
 117                         .reg_drain      = 0x0b,
 118                         .reg_polarity   = 0x0d,
 119                         .reg_clock      = 0x1e,
 120                         .reg_misc       = 0x1f,
 121                         .reg_reset      = 0x7d,
 122                 },
 123                 .ngpios = 16
 124         },
 125         [2] = { /* sx1506q */
 126                 .model = SX150X_456,
 127                 .reg_pullup     = 0x05,
 128                 .reg_pulldn     = 0x07,
 129                 .reg_dir        = 0x03,
 130                 .reg_data       = 0x01,
 131                 .reg_irq_mask   = 0x09,
 132                 .reg_irq_src    = 0x0f,
 133                 .reg_sense      = 0x0d,
 134                 .pri.x456 = {
 135                         .reg_pld_mode   = 0x21,
 136                         .reg_pld_table0 = 0x23,
 137                         .reg_pld_table1 = 0x25,
 138                         .reg_pld_table2 = 0x27,
 139                         .reg_pld_table3 = 0x29,
 140                         .reg_pld_table4 = 0x2b,
 141                         .reg_advance    = 0xad,
 142                 },
 143                 .ngpios = 16
 144         },
 145 };
 146
 147 static const struct i2c_device_id sx150x_id[] = {
 148         {"sx1508q", 0},
 149         {"sx1509q", 1},
 150         {"sx1506q", 2},
 151         {}
 152 };
 153 MODULE_DEVICE_TABLE(i2c, sx150x_id);
 154
 155 static const struct of_device_id sx150x_of_match[] = {
 156         { .compatible = "semtech,sx1508q" },
 157         { .compatible = "semtech,sx1509q" },
 158         { .compatible = "semtech,sx1506q" },
 159         {},
 160 };
 161 MODULE_DEVICE_TABLE(of, sx150x_of_match);
 162
 163 static s32 sx150x_i2c_write(struct i2c_client *client, u8 reg, u8 val)
 164 {
 165         s32 err = i2c_smbus_write_byte_data(client, reg, val);
 166
 167         if (err < 0)
 168                 dev_warn(&client->dev,
 169                         "i2c write fail: can't write %02x to %02x: %d\n",
 170                         val, reg, err);
 171         return err;
 172 }
 173
 174 static s32 sx150x_i2c_read(struct i2c_client *client, u8 reg, u8 *val)
 175 {
 176         s32 err = i2c_smbus_read_byte_data(client, reg);
 177
 178         if (err >= 0)
 179                 *val = err;
 180         else
 181                 dev_warn(&client->dev,
 182                         "i2c read fail: can't read from %02x: %d\n",
 183                         reg, err);
 184         return err;
 185 }
 186
 187 static inline bool offset_is_oscio(struct sx150x_chip *chip, unsigned offset)
 188 {
 189         return (chip->dev_cfg->ngpios == offset);
 190 }
 191
 192 /*
 193  * These utility functions solve the common problem of locating and setting
 194  * configuration bits.  Configuration bits are grouped into registers
 195  * whose indexes increase downwards.  For example, with eight-bit registers,
 196  * sixteen gpios would have their config bits grouped in the following order:
 197  * REGISTER N-1 [ f e d c b a 9 8 ]
 198  *          N   [ 7 6 5 4 3 2 1 0 ]
 199  *
 200  * For multi-bit configurations, the pattern gets wider:
 201  * REGISTER N-3 [ f f e e d d c c ]
 202  *          N-2 [ b b a a 9 9 8 8 ]
 203  *          N-1 [ 7 7 6 6 5 5 4 4 ]
 204  *          N   [ 3 3 2 2 1 1 0 0 ]
 205  *
 206  * Given the address of the starting register 'N', the index of the gpio
 207  * whose configuration we seek to change, and the width in bits of that
 208  * configuration, these functions allow us to locate the correct
 209  * register and mask the correct bits.
 210  */
 211 static inline void sx150x_find_cfg(u8 offset, u8 width,
 212                                 u8 *reg, u8 *mask, u8 *shift)
 213 {
 214         *reg   -= offset * width / 8;
 215         *mask   = (1 << width) - 1;
 216         *shift  = (offset * width) % 8;
 217         *mask <<= *shift;
 218 }
 219
 220 static s32 sx150x_write_cfg(struct sx150x_chip *chip,
 221                         u8 offset, u8 width, u8 reg, u8 val)
 222 {
 223         u8  mask;
 224         u8  data;
 225         u8  shift;
 226         s32 err;
 227
 228         sx150x_find_cfg(offset, width, &reg, &mask, &shift);
 229         err = sx150x_i2c_read(chip->client, reg, &data);
 230         if (err < 0)
 231                 return err;
 232
 233         data &= ~mask;
 234         data |= (val << shift) & mask;
 235         return sx150x_i2c_write(chip->client, reg, data);
 236 }
 237
 238 static int sx150x_get_io(struct sx150x_chip *chip, unsigned offset)
 239 {
 240         u8  reg = chip->dev_cfg->reg_data;
 241         u8  mask;
 242         u8  data;
 243         u8  shift;
 244         s32 err;
 245
 246         sx150x_find_cfg(offset, 1, &reg, &mask, &shift);
 247         err = sx150x_i2c_read(chip->client, reg, &data);
 248         if (err >= 0)
 249                 err = (data & mask) != 0 ? 1 : 0;
 250
 251         return err;
 252 }
 253
 254 static void sx150x_set_oscio(struct sx150x_chip *chip, int val)
 255 {
 256         sx150x_i2c_write(chip->client,
 257                         chip->dev_cfg->pri.x789.reg_clock,
 258                         (val ? 0x1f : 0x10));
 259 }
 260
 261 static void sx150x_set_io(struct sx150x_chip *chip, unsigned offset, int val)
 262 {
 263         sx150x_write_cfg(chip,
 264                         offset,
 265                         1,
 266                         chip->dev_cfg->reg_data,
 267                         (val ? 1 : 0));
 268 }
 269
 270 static int sx150x_io_input(struct sx150x_chip *chip, unsigned offset)
 271 {
 272         return sx150x_write_cfg(chip,
 273                                 offset,
 274                                 1,
 275                                 chip->dev_cfg->reg_dir,
 276                                 1);
 277 }
 278
 279 static int sx150x_io_output(struct sx150x_chip *chip, unsigned offset, int val)
 280 {
 281         int err;
 282
 283         err = sx150x_write_cfg(chip,
 284                         offset,
 285                         1,
 286                         chip->dev_cfg->reg_data,
 287                         (val ? 1 : 0));
 288         if (err >= 0)
 289                 err = sx150x_write_cfg(chip,
 290                                 offset,
 291                                 1,
 292                                 chip->dev_cfg->reg_dir,
 293                                 0);
 294         return err;
 295 }
 296
 297 static int sx150x_gpio_get(struct gpio_chip *gc, unsigned offset)
 298 {
 299         struct sx150x_chip *chip;
 300         int status = -EINVAL;
 301
 302         chip = container_of(gc, struct sx150x_chip, gpio_chip);
 303
 304         if (!offset_is_oscio(chip, offset)) {
 305                 mutex_lock(&chip->lock);
 306                 status = sx150x_get_io(chip, offset);
 307                 mutex_unlock(&chip->lock);
 308         }
 309
 310         return status;
 311 }
 312
 313 static void sx150x_gpio_set(struct gpio_chip *gc, unsigned offset, int val)
 314 {
 315         struct sx150x_chip *chip;
 316
 317         chip = container_of(gc, struct sx150x_chip, gpio_chip);
 318
 319         mutex_lock(&chip->lock);
 320         if (offset_is_oscio(chip, offset))
 321                 sx150x_set_oscio(chip, val);
 322         else
 323                 sx150x_set_io(chip, offset, val);
 324         mutex_unlock(&chip->lock);
 325 }
 326
 327 static int sx150x_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
 328 {
 329         struct sx150x_chip *chip;
 330         int status = -EINVAL;
 331
 332         chip = container_of(gc, struct sx150x_chip, gpio_chip);
 333
 334         if (!offset_is_oscio(chip, offset)) {
 335                 mutex_lock(&chip->lock);
 336                 status = sx150x_io_input(chip, offset);
 337                 mutex_unlock(&chip->lock);
 338         }
 339         return status;
 340 }
 341
 342 static int sx150x_gpio_direction_output(struct gpio_chip *gc,
 343                                         unsigned offset,
 344                                         int val)
 345 {
 346         struct sx150x_chip *chip;
 347         int status = 0;
 348
 349         chip = container_of(gc, struct sx150x_chip, gpio_chip);
 350
 351         if (!offset_is_oscio(chip, offset)) {
 352                 mutex_lock(&chip->lock);
 353                 status = sx150x_io_output(chip, offset, val);
 354                 mutex_unlock(&chip->lock);
 355         }
 356         return status;
 357 }
 358
 359 static void sx150x_irq_mask(struct irq_data *d)
 360 {
 361         struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
 362         unsigned n = d->hwirq;
 363
 364         chip->irq_masked |= (1 << n);
 365         chip->irq_update = n;
 366 }
 367
 368 static void sx150x_irq_unmask(struct irq_data *d)
 369 {
 370         struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
 371         unsigned n = d->hwirq;
 372
 373         chip->irq_masked &= ~(1 << n);
 374         chip->irq_update = n;
 375 }
 376
 377 static int sx150x_irq_set_type(struct irq_data *d, unsigned int flow_type)
 378 {
 379         struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
 380         unsigned n, val = 0;
 381
 382         if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
 383                 return -EINVAL;
 384
 385         n = d->hwirq;
 386
 387         if (flow_type & IRQ_TYPE_EDGE_RISING)
 388                 val |= 0x1;
 389         if (flow_type & IRQ_TYPE_EDGE_FALLING)
 390                 val |= 0x2;
 391
 392         chip->irq_sense &= ~(3UL << (n * 2));
 393         chip->irq_sense |= val << (n * 2);
 394         chip->irq_update = n;
 395         return 0;
 396 }
 397
 398 static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
 399 {
 400         struct sx150x_chip *chip = (struct sx150x_chip *)dev_id;
 401         unsigned nhandled = 0;
 402         unsigned sub_irq;
 403         unsigned n;
 404         s32 err;
 405         u8 val;
 406         int i;
 407
 408         for (i = (chip->dev_cfg->ngpios / 8) - 1; i >= 0; --i) {
 409                 err = sx150x_i2c_read(chip->client,
 410                                       chip->dev_cfg->reg_irq_src - i,
 411                                       &val);
 412                 if (err < 0)
 413                         continue;
 414
 415                 sx150x_i2c_write(chip->client,
 416                                 chip->dev_cfg->reg_irq_src - i,
 417                                 val);
 418                 for (n = 0; n < 8; ++n) {
 419                         if (val & (1 << n)) {
 420                                 sub_irq = irq_find_mapping(
 421                                         chip->gpio_chip.irqdomain,
 422                                         (i * 8) + n);
 423                                 handle_nested_irq(sub_irq);
 424                                 ++nhandled;
 425                         }
 426                 }
 427         }
 428
 429         return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE);
 430 }
 431
 432 static void sx150x_irq_bus_lock(struct irq_data *d)
 433 {
 434         struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
 435
 436         mutex_lock(&chip->lock);
 437 }
 438
 439 static void sx150x_irq_bus_sync_unlock(struct irq_data *d)
 440 {
 441         struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
 442         unsigned n;
 443
 444         if (chip->irq_update == NO_UPDATE_PENDING)
 445                 goto out;
 446
 447         n = chip->irq_update;
 448         chip->irq_update = NO_UPDATE_PENDING;
 449
 450         /* Avoid updates if nothing changed */
 451         if (chip->dev_sense == chip->irq_sense &&
 452             chip->dev_masked == chip->irq_masked)
 453                 goto out;
 454
 455         chip->dev_sense = chip->irq_sense;
 456         chip->dev_masked = chip->irq_masked;
 457
 458         if (chip->irq_masked & (1 << n)) {
 459                 sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 1);
 460                 sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense, 0);
 461         } else {
 462                 sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 0);
 463                 sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense,
 464                                  chip->irq_sense >> (n * 2));
 465         }
 466 out:
 467         mutex_unlock(&chip->lock);
 468 }
 469
 470 static void sx150x_init_chip(struct sx150x_chip *chip,
 471                         struct i2c_client *client,
 472                         kernel_ulong_t driver_data,
 473                         struct sx150x_platform_data *pdata)
 474 {
 475         mutex_init(&chip->lock);
 476
 477         chip->client                     = client;
 478         chip->dev_cfg                    = &sx150x_devices[driver_data];
 479         chip->gpio_chip.dev              = &client->dev;
 480         chip->gpio_chip.label            = client->name;
 481         chip->gpio_chip.direction_input  = sx150x_gpio_direction_input;
 482         chip->gpio_chip.direction_output = sx150x_gpio_direction_output;
 483         chip->gpio_chip.get              = sx150x_gpio_get;
 484         chip->gpio_chip.set              = sx150x_gpio_set;
 485         chip->gpio_chip.base             = pdata->gpio_base;
 486         chip->gpio_chip.can_sleep        = true;
 487         chip->gpio_chip.ngpio            = chip->dev_cfg->ngpios;
 488 #ifdef CONFIG_OF_GPIO
 489         chip->gpio_chip.of_node          = client->dev.of_node;
 490         chip->gpio_chip.of_gpio_n_cells  = 2;
 491 #endif
 492         if (pdata->oscio_is_gpo)
 493                 ++chip->gpio_chip.ngpio;
 494
 495         chip->irq_chip.name                = client->name;
 496         chip->irq_chip.irq_mask            = sx150x_irq_mask;
 497         chip->irq_chip.irq_unmask          = sx150x_irq_unmask;
 498         chip->irq_chip.irq_set_type        = sx150x_irq_set_type;
 499         chip->irq_chip.irq_bus_lock        = sx150x_irq_bus_lock;
 500         chip->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock;
 501         chip->irq_summary                  = -1;
 502         chip->irq_base                     = -1;
 503         chip->irq_masked                   = ~0;
 504         chip->irq_sense                    = 0;
 505         chip->dev_masked                   = ~0;
 506         chip->dev_sense                    = 0;
 507         chip->irq_update                   = NO_UPDATE_PENDING;
 508 }
 509
 510 static int sx150x_init_io(struct sx150x_chip *chip, u8 base, u16 cfg)
 511 {
 512         int err = 0;
 513         unsigned n;
 514
 515         for (n = 0; err >= 0 && n < (chip->dev_cfg->ngpios / 8); ++n)
 516                 err = sx150x_i2c_write(chip->client, base - n, cfg >> (n * 8));
 517         return err;
 518 }
 519
 520 static int sx150x_reset(struct sx150x_chip *chip)
 521 {
 522         int err;
 523
 524         err = i2c_smbus_write_byte_data(chip->client,
 525                                         chip->dev_cfg->pri.x789.reg_reset,
 526                                         0x12);
 527         if (err < 0)
 528                 return err;
 529
 530         err = i2c_smbus_write_byte_data(chip->client,
 531                                         chip->dev_cfg->pri.x789.reg_reset,
 532                                         0x34);
 533         return err;
 534 }
 535
 536 static int sx150x_init_hw(struct sx150x_chip *chip,
 537                         struct sx150x_platform_data *pdata)
 538 {
 539         int err = 0;
 540
 541         if (pdata->reset_during_probe) {
 542                 err = sx150x_reset(chip);
 543                 if (err < 0)
 544                         return err;
 545         }
 546
 547         if (chip->dev_cfg->model == SX150X_789)
 548                 err = sx150x_i2c_write(chip->client,
 549                                 chip->dev_cfg->pri.x789.reg_misc,
 550                                 0x01);
 551         else
 552                 err = sx150x_i2c_write(chip->client,
 553                                 chip->dev_cfg->pri.x456.reg_advance,
 554                                 0x04);
 555         if (err < 0)
 556                 return err;
 557
 558         err = sx150x_init_io(chip, chip->dev_cfg->reg_pullup,
 559                         pdata->io_pullup_ena);
 560         if (err < 0)
 561                 return err;
 562
 563         err = sx150x_init_io(chip, chip->dev_cfg->reg_pulldn,
 564                         pdata->io_pulldn_ena);
 565         if (err < 0)
 566                 return err;
 567
 568         if (chip->dev_cfg->model == SX150X_789) {
 569                 err = sx150x_init_io(chip,
 570                                 chip->dev_cfg->pri.x789.reg_drain,
 571                                 pdata->io_open_drain_ena);
 572                 if (err < 0)
 573                         return err;
 574
 575                 err = sx150x_init_io(chip,
 576                                 chip->dev_cfg->pri.x789.reg_polarity,
 577                                 pdata->io_polarity);
 578                 if (err < 0)
 579                         return err;
 580         } else {
 581                 /* Set all pins to work in normal mode */
 582                 err = sx150x_init_io(chip,
 583                                 chip->dev_cfg->pri.x456.reg_pld_mode,
 584                                 0);
 585                 if (err < 0)
 586                         return err;
 587         }
 588
 589
 590         if (pdata->oscio_is_gpo)
 591                 sx150x_set_oscio(chip, 0);
 592
 593         return err;
 594 }
 595
 596 static int sx150x_install_irq_chip(struct sx150x_chip *chip,
 597                                 int irq_summary,
 598                                 int irq_base)
 599 {
 600         int err;
 601
 602         chip->irq_summary = irq_summary;
 603         chip->irq_base    = irq_base;
 604
 605         /* Add gpio chip to irq subsystem */
 606         err = gpiochip_irqchip_add(&chip->gpio_chip,
 607                 &chip->irq_chip, chip->irq_base,
 608                 handle_edge_irq, IRQ_TYPE_EDGE_BOTH);
 609         if (err) {
 610                 dev_err(&chip->client->dev,
 611                         "could not connect irqchip to gpiochip\n");
 612                 return  err;
 613         }
 614
 615         err = devm_request_threaded_irq(&chip->client->dev,
 616                         irq_summary, NULL, sx150x_irq_thread_fn,
 617                         IRQF_ONESHOT | IRQF_SHARED | IRQF_TRIGGER_FALLING,
 618                         chip->irq_chip.name, chip);
 619         if (err < 0) {
 620                 chip->irq_summary = -1;
 621                 chip->irq_base    = -1;
 622         }
 623
 624         return err;
 625 }
 626
 627 static int sx150x_probe(struct i2c_client *client,
 628                                 const struct i2c_device_id *id)
 629 {
 630         static const u32 i2c_funcs = I2C_FUNC_SMBUS_BYTE_DATA |
 631                                      I2C_FUNC_SMBUS_WRITE_WORD_DATA;
 632         struct sx150x_platform_data *pdata;
 633         struct sx150x_chip *chip;
 634         int rc;
 635
 636         pdata = dev_get_platdata(&client->dev);
 637         if (!pdata)
 638                 return -EINVAL;
 639
 640         if (!i2c_check_functionality(client->adapter, i2c_funcs))
 641                 return -ENOSYS;
 642
 643         chip = devm_kzalloc(&client->dev,
 644                 sizeof(struct sx150x_chip), GFP_KERNEL);
 645         if (!chip)
 646                 return -ENOMEM;
 647
 648         sx150x_init_chip(chip, client, id->driver_data, pdata);
 649         rc = sx150x_init_hw(chip, pdata);
 650         if (rc < 0)
 651                 return rc;
 652
 653         rc = gpiochip_add(&chip->gpio_chip);
 654         if (rc)
 655                 return rc;
 656
 657         if (pdata->irq_summary >= 0) {
 658                 rc = sx150x_install_irq_chip(chip,
 659                                         pdata->irq_summary,
 660                                         pdata->irq_base);
 661                 if (rc < 0)
 662                         goto probe_fail_post_gpiochip_add;
 663         }
 664
 665         i2c_set_clientdata(client, chip);
 666
 667         return 0;
 668 probe_fail_post_gpiochip_add:
 669         gpiochip_remove(&chip->gpio_chip);
 670         return rc;
 671 }
 672
 673 static int sx150x_remove(struct i2c_client *client)
 674 {
 675         struct sx150x_chip *chip;
 676
 677         chip = i2c_get_clientdata(client);
 678         gpiochip_remove(&chip->gpio_chip);
 679
 680         return 0;
 681 }
 682
 683 static struct i2c_driver sx150x_driver = {
 684         .driver = {
 685                 .name = "sx150x",
 686                 .owner = THIS_MODULE,
 687                 .of_match_table = of_match_ptr(sx150x_of_match),
 688         },
 689         .probe    = sx150x_probe,
 690         .remove   = sx150x_remove,
 691         .id_table = sx150x_id,
 692 };
 693
 694 static int __init sx150x_init(void)
 695 {
 696         return i2c_add_driver(&sx150x_driver);
 697 }
 698 subsys_initcall(sx150x_init);
 699
 700 static void __exit sx150x_exit(void)
 701 {
 702         return i2c_del_driver(&sx150x_driver);
 703 }
 704 module_exit(sx150x_exit);
 705
 706 MODULE_AUTHOR("Gregory Bean <gbean@codeaurora.org>");
 707 MODULE_DESCRIPTION("Driver for Semtech SX150X I2C GPIO Expanders");
 708 MODULE_LICENSE("GPL v2");
 709 MODULE_ALIAS("i2c:sx150x");