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_dt_id[] = {
 156         { .compatible = "semtech,sx1508q" },
 157         { .compatible = "semtech,sx1509q" },
 158         { .compatible = "semtech,sx1506q" },
 159         {},
 160 };
 161
 162 static s32 sx150x_i2c_write(struct i2c_client *client, u8 reg, u8 val)
 163 {
 164         s32 err = i2c_smbus_write_byte_data(client, reg, val);
 165
 166         if (err < 0)
 167                 dev_warn(&client->dev,
 168                         "i2c write fail: can't write %02x to %02x: %d\n",
 169                         val, reg, err);
 170         return err;
 171 }
 172
 173 static s32 sx150x_i2c_read(struct i2c_client *client, u8 reg, u8 *val)
 174 {
 175         s32 err = i2c_smbus_read_byte_data(client, reg);
 176
 177         if (err >= 0)
 178                 *val = err;
 179         else
 180                 dev_warn(&client->dev,
 181                         "i2c read fail: can't read from %02x: %d\n",
 182                         reg, err);
 183         return err;
 184 }
 185
 186 static inline bool offset_is_oscio(struct sx150x_chip *chip, unsigned offset)
 187 {
 188         return (chip->dev_cfg->ngpios == offset);
 189 }
 190
 191 /*
 192  * These utility functions solve the common problem of locating and setting
 193  * configuration bits.  Configuration bits are grouped into registers
 194  * whose indexes increase downwards.  For example, with eight-bit registers,
 195  * sixteen gpios would have their config bits grouped in the following order:
 196  * REGISTER N-1 [ f e d c b a 9 8 ]
 197  *          N   [ 7 6 5 4 3 2 1 0 ]
 198  *
 199  * For multi-bit configurations, the pattern gets wider:
 200  * REGISTER N-3 [ f f e e d d c c ]
 201  *          N-2 [ b b a a 9 9 8 8 ]
 202  *          N-1 [ 7 7 6 6 5 5 4 4 ]
 203  *          N   [ 3 3 2 2 1 1 0 0 ]
 204  *
 205  * Given the address of the starting register 'N', the index of the gpio
 206  * whose configuration we seek to change, and the width in bits of that
 207  * configuration, these functions allow us to locate the correct
 208  * register and mask the correct bits.
 209  */
 210 static inline void sx150x_find_cfg(u8 offset, u8 width,
 211                                 u8 *reg, u8 *mask, u8 *shift)
 212 {
 213         *reg   -= offset * width / 8;
 214         *mask   = (1 << width) - 1;
 215         *shift  = (offset * width) % 8;
 216         *mask <<= *shift;
 217 }
 218
 219 static s32 sx150x_write_cfg(struct sx150x_chip *chip,
 220                         u8 offset, u8 width, u8 reg, u8 val)
 221 {
 222         u8  mask;
 223         u8  data;
 224         u8  shift;
 225         s32 err;
 226
 227         sx150x_find_cfg(offset, width, &reg, &mask, &shift);
 228         err = sx150x_i2c_read(chip->client, reg, &data);
 229         if (err < 0)
 230                 return err;
 231
 232         data &= ~mask;
 233         data |= (val << shift) & mask;
 234         return sx150x_i2c_write(chip->client, reg, data);
 235 }
 236
 237 static int sx150x_get_io(struct sx150x_chip *chip, unsigned offset)
 238 {
 239         u8  reg = chip->dev_cfg->reg_data;
 240         u8  mask;
 241         u8  data;
 242         u8  shift;
 243         s32 err;
 244
 245         sx150x_find_cfg(offset, 1, &reg, &mask, &shift);
 246         err = sx150x_i2c_read(chip->client, reg, &data);
 247         if (err >= 0)
 248                 err = (data & mask) != 0 ? 1 : 0;
 249
 250         return err;
 251 }
 252
 253 static void sx150x_set_oscio(struct sx150x_chip *chip, int val)
 254 {
 255         sx150x_i2c_write(chip->client,
 256                         chip->dev_cfg->pri.x789.reg_clock,
 257                         (val ? 0x1f : 0x10));
 258 }
 259
 260 static void sx150x_set_io(struct sx150x_chip *chip, unsigned offset, int val)
 261 {
 262         sx150x_write_cfg(chip,
 263                         offset,
 264                         1,
 265                         chip->dev_cfg->reg_data,
 266                         (val ? 1 : 0));
 267 }
 268
 269 static int sx150x_io_input(struct sx150x_chip *chip, unsigned offset)
 270 {
 271         return sx150x_write_cfg(chip,
 272                                 offset,
 273                                 1,
 274                                 chip->dev_cfg->reg_dir,
 275                                 1);
 276 }
 277
 278 static int sx150x_io_output(struct sx150x_chip *chip, unsigned offset, int val)
 279 {
 280         int err;
 281
 282         err = sx150x_write_cfg(chip,
 283                         offset,
 284                         1,
 285                         chip->dev_cfg->reg_data,
 286                         (val ? 1 : 0));
 287         if (err >= 0)
 288                 err = sx150x_write_cfg(chip,
 289                                 offset,
 290                                 1,
 291                                 chip->dev_cfg->reg_dir,
 292                                 0);
 293         return err;
 294 }
 295
 296 static int sx150x_gpio_get(struct gpio_chip *gc, unsigned offset)
 297 {
 298         struct sx150x_chip *chip;
 299         int status = -EINVAL;
 300
 301         chip = container_of(gc, struct sx150x_chip, gpio_chip);
 302
 303         if (!offset_is_oscio(chip, offset)) {
 304                 mutex_lock(&chip->lock);
 305                 status = sx150x_get_io(chip, offset);
 306                 mutex_unlock(&chip->lock);
 307         }
 308
 309         return status;
 310 }
 311
 312 static void sx150x_gpio_set(struct gpio_chip *gc, unsigned offset, int val)
 313 {
 314         struct sx150x_chip *chip;
 315
 316         chip = container_of(gc, struct sx150x_chip, gpio_chip);
 317
 318         mutex_lock(&chip->lock);
 319         if (offset_is_oscio(chip, offset))
 320                 sx150x_set_oscio(chip, val);
 321         else
 322                 sx150x_set_io(chip, offset, val);
 323         mutex_unlock(&chip->lock);
 324 }
 325
 326 static int sx150x_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
 327 {
 328         struct sx150x_chip *chip;
 329         int status = -EINVAL;
 330
 331         chip = container_of(gc, struct sx150x_chip, gpio_chip);
 332
 333         if (!offset_is_oscio(chip, offset)) {
 334                 mutex_lock(&chip->lock);
 335                 status = sx150x_io_input(chip, offset);
 336                 mutex_unlock(&chip->lock);
 337         }
 338         return status;
 339 }
 340
 341 static int sx150x_gpio_direction_output(struct gpio_chip *gc,
 342                                         unsigned offset,
 343                                         int val)
 344 {
 345         struct sx150x_chip *chip;
 346         int status = 0;
 347
 348         chip = container_of(gc, struct sx150x_chip, gpio_chip);
 349
 350         if (!offset_is_oscio(chip, offset)) {
 351                 mutex_lock(&chip->lock);
 352                 status = sx150x_io_output(chip, offset, val);
 353                 mutex_unlock(&chip->lock);
 354         }
 355         return status;
 356 }
 357
 358 static void sx150x_irq_mask(struct irq_data *d)
 359 {
 360         struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
 361         unsigned n = d->hwirq;
 362
 363         chip->irq_masked |= (1 << n);
 364         chip->irq_update = n;
 365 }
 366
 367 static void sx150x_irq_unmask(struct irq_data *d)
 368 {
 369         struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
 370         unsigned n = d->hwirq;
 371
 372         chip->irq_masked &= ~(1 << n);
 373         chip->irq_update = n;
 374 }
 375
 376 static int sx150x_irq_set_type(struct irq_data *d, unsigned int flow_type)
 377 {
 378         struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
 379         unsigned n, val = 0;
 380
 381         if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
 382                 return -EINVAL;
 383
 384         n = d->hwirq;
 385
 386         if (flow_type & IRQ_TYPE_EDGE_RISING)
 387                 val |= 0x1;
 388         if (flow_type & IRQ_TYPE_EDGE_FALLING)
 389                 val |= 0x2;
 390
 391         chip->irq_sense &= ~(3UL << (n * 2));
 392         chip->irq_sense |= val << (n * 2);
 393         chip->irq_update = n;
 394         return 0;
 395 }
 396
 397 static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
 398 {
 399         struct sx150x_chip *chip = (struct sx150x_chip *)dev_id;
 400         unsigned nhandled = 0;
 401         unsigned sub_irq;
 402         unsigned n;
 403         s32 err;
 404         u8 val;
 405         int i;
 406
 407         for (i = (chip->dev_cfg->ngpios / 8) - 1; i >= 0; --i) {
 408                 err = sx150x_i2c_read(chip->client,
 409                                       chip->dev_cfg->reg_irq_src - i,
 410                                       &val);
 411                 if (err < 0)
 412                         continue;
 413
 414                 sx150x_i2c_write(chip->client,
 415                                 chip->dev_cfg->reg_irq_src - i,
 416                                 val);
 417                 for (n = 0; n < 8; ++n) {
 418                         if (val & (1 << n)) {
 419                                 sub_irq = irq_find_mapping(
 420                                         chip->gpio_chip.irqdomain,
 421                                         (i * 8) + n);
 422                                 handle_nested_irq(sub_irq);
 423                                 ++nhandled;
 424                         }
 425                 }
 426         }
 427
 428         return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE);
 429 }
 430
 431 static void sx150x_irq_bus_lock(struct irq_data *d)
 432 {
 433         struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
 434
 435         mutex_lock(&chip->lock);
 436 }
 437
 438 static void sx150x_irq_bus_sync_unlock(struct irq_data *d)
 439 {
 440         struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
 441         unsigned n;
 442
 443         if (chip->irq_update == NO_UPDATE_PENDING)
 444                 goto out;
 445
 446         n = chip->irq_update;
 447         chip->irq_update = NO_UPDATE_PENDING;
 448
 449         /* Avoid updates if nothing changed */
 450         if (chip->dev_sense == chip->irq_sense &&
 451             chip->dev_masked == chip->irq_masked)
 452                 goto out;
 453
 454         chip->dev_sense = chip->irq_sense;
 455         chip->dev_masked = chip->irq_masked;
 456
 457         if (chip->irq_masked & (1 << n)) {
 458                 sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 1);
 459                 sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense, 0);
 460         } else {
 461                 sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 0);
 462                 sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense,
 463                                  chip->irq_sense >> (n * 2));
 464         }
 465 out:
 466         mutex_unlock(&chip->lock);
 467 }
 468
 469 static void sx150x_init_chip(struct sx150x_chip *chip,
 470                         struct i2c_client *client,
 471                         kernel_ulong_t driver_data,
 472                         struct sx150x_platform_data *pdata)
 473 {
 474         mutex_init(&chip->lock);
 475
 476         chip->client                     = client;
 477         chip->dev_cfg                    = &sx150x_devices[driver_data];
 478         chip->gpio_chip.dev              = &client->dev;
 479         chip->gpio_chip.label            = client->name;
 480         chip->gpio_chip.direction_input  = sx150x_gpio_direction_input;
 481         chip->gpio_chip.direction_output = sx150x_gpio_direction_output;
 482         chip->gpio_chip.get              = sx150x_gpio_get;
 483         chip->gpio_chip.set              = sx150x_gpio_set;
 484         chip->gpio_chip.base             = pdata->gpio_base;
 485         chip->gpio_chip.can_sleep        = true;
 486         chip->gpio_chip.ngpio            = chip->dev_cfg->ngpios;
 487         chip->gpio_chip.of_node          = client->dev.of_node;
 488         chip->gpio_chip.of_gpio_n_cells  = 2;
 489         if (pdata->oscio_is_gpo)
 490                 ++chip->gpio_chip.ngpio;
 491
 492         chip->irq_chip.name                = client->name;
 493         chip->irq_chip.irq_mask            = sx150x_irq_mask;
 494         chip->irq_chip.irq_unmask          = sx150x_irq_unmask;
 495         chip->irq_chip.irq_set_type        = sx150x_irq_set_type;
 496         chip->irq_chip.irq_bus_lock        = sx150x_irq_bus_lock;
 497         chip->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock;
 498         chip->irq_summary                  = -1;
 499         chip->irq_base                     = -1;
 500         chip->irq_masked                   = ~0;
 501         chip->irq_sense                    = 0;
 502         chip->dev_masked                   = ~0;
 503         chip->dev_sense                    = 0;
 504         chip->irq_update                   = NO_UPDATE_PENDING;
 505 }
 506
 507 static int sx150x_init_io(struct sx150x_chip *chip, u8 base, u16 cfg)
 508 {
 509         int err = 0;
 510         unsigned n;
 511
 512         for (n = 0; err >= 0 && n < (chip->dev_cfg->ngpios / 8); ++n)
 513                 err = sx150x_i2c_write(chip->client, base - n, cfg >> (n * 8));
 514         return err;
 515 }
 516
 517 static int sx150x_reset(struct sx150x_chip *chip)
 518 {
 519         int err;
 520
 521         err = i2c_smbus_write_byte_data(chip->client,
 522                                         chip->dev_cfg->pri.x789.reg_reset,
 523                                         0x12);
 524         if (err < 0)
 525                 return err;
 526
 527         err = i2c_smbus_write_byte_data(chip->client,
 528                                         chip->dev_cfg->pri.x789.reg_reset,
 529                                         0x34);
 530         return err;
 531 }
 532
 533 static int sx150x_init_hw(struct sx150x_chip *chip,
 534                         struct sx150x_platform_data *pdata)
 535 {
 536         int err = 0;
 537
 538         if (pdata->reset_during_probe) {
 539                 err = sx150x_reset(chip);
 540                 if (err < 0)
 541                         return err;
 542         }
 543
 544         if (chip->dev_cfg->model == SX150X_789)
 545                 err = sx150x_i2c_write(chip->client,
 546                                 chip->dev_cfg->pri.x789.reg_misc,
 547                                 0x01);
 548         else
 549                 err = sx150x_i2c_write(chip->client,
 550                                 chip->dev_cfg->pri.x456.reg_advance,
 551                                 0x04);
 552         if (err < 0)
 553                 return err;
 554
 555         err = sx150x_init_io(chip, chip->dev_cfg->reg_pullup,
 556                         pdata->io_pullup_ena);
 557         if (err < 0)
 558                 return err;
 559
 560         err = sx150x_init_io(chip, chip->dev_cfg->reg_pulldn,
 561                         pdata->io_pulldn_ena);
 562         if (err < 0)
 563                 return err;
 564
 565         if (chip->dev_cfg->model == SX150X_789) {
 566                 err = sx150x_init_io(chip,
 567                                 chip->dev_cfg->pri.x789.reg_drain,
 568                                 pdata->io_open_drain_ena);
 569                 if (err < 0)
 570                         return err;
 571
 572                 err = sx150x_init_io(chip,
 573                                 chip->dev_cfg->pri.x789.reg_polarity,
 574                                 pdata->io_polarity);
 575                 if (err < 0)
 576                         return err;
 577         } else {
 578                 /* Set all pins to work in normal mode */
 579                 err = sx150x_init_io(chip,
 580                                 chip->dev_cfg->pri.x456.reg_pld_mode,
 581                                 0);
 582                 if (err < 0)
 583                         return err;
 584         }
 585
 586
 587         if (pdata->oscio_is_gpo)
 588                 sx150x_set_oscio(chip, 0);
 589
 590         return err;
 591 }
 592
 593 static int sx150x_install_irq_chip(struct sx150x_chip *chip,
 594                                 int irq_summary,
 595                                 int irq_base)
 596 {
 597         int err;
 598
 599         chip->irq_summary = irq_summary;
 600         chip->irq_base    = irq_base;
 601
 602         /* Add gpio chip to irq subsystem */
 603         err = gpiochip_irqchip_add(&chip->gpio_chip,
 604                 &chip->irq_chip, chip->irq_base,
 605                 handle_edge_irq, IRQ_TYPE_EDGE_BOTH);
 606         if (err) {
 607                 dev_err(&chip->client->dev,
 608                         "could not connect irqchip to gpiochip\n");
 609                 return  err;
 610         }
 611
 612         err = devm_request_threaded_irq(&chip->client->dev,
 613                         irq_summary, NULL, sx150x_irq_thread_fn,
 614                         IRQF_ONESHOT | IRQF_SHARED | IRQF_TRIGGER_FALLING,
 615                         chip->irq_chip.name, chip);
 616         if (err < 0) {
 617                 chip->irq_summary = -1;
 618                 chip->irq_base    = -1;
 619         }
 620
 621         return err;
 622 }
 623
 624 static int sx150x_probe(struct i2c_client *client,
 625                                 const struct i2c_device_id *id)
 626 {
 627         static const u32 i2c_funcs = I2C_FUNC_SMBUS_BYTE_DATA |
 628                                      I2C_FUNC_SMBUS_WRITE_WORD_DATA;
 629         struct sx150x_platform_data *pdata;
 630         struct sx150x_chip *chip;
 631         int rc;
 632
 633         pdata = dev_get_platdata(&client->dev);
 634         if (!pdata)
 635                 return -EINVAL;
 636
 637         if (!i2c_check_functionality(client->adapter, i2c_funcs))
 638                 return -ENOSYS;
 639
 640         chip = devm_kzalloc(&client->dev,
 641                 sizeof(struct sx150x_chip), GFP_KERNEL);
 642         if (!chip)
 643                 return -ENOMEM;
 644
 645         sx150x_init_chip(chip, client, id->driver_data, pdata);
 646         rc = sx150x_init_hw(chip, pdata);
 647         if (rc < 0)
 648                 return rc;
 649
 650         rc = gpiochip_add(&chip->gpio_chip);
 651         if (rc)
 652                 return rc;
 653
 654         if (pdata->irq_summary >= 0) {
 655                 rc = sx150x_install_irq_chip(chip,
 656                                         pdata->irq_summary,
 657                                         pdata->irq_base);
 658                 if (rc < 0)
 659                         goto probe_fail_post_gpiochip_add;
 660         }
 661
 662         i2c_set_clientdata(client, chip);
 663
 664         return 0;
 665 probe_fail_post_gpiochip_add:
 666         gpiochip_remove(&chip->gpio_chip);
 667         return rc;
 668 }
 669
 670 static int sx150x_remove(struct i2c_client *client)
 671 {
 672         struct sx150x_chip *chip;
 673
 674         chip = i2c_get_clientdata(client);
 675         gpiochip_remove(&chip->gpio_chip);
 676
 677         return 0;
 678 }
 679
 680 static struct i2c_driver sx150x_driver = {
 681         .driver = {
 682                 .name = "sx150x",
 683                 .owner = THIS_MODULE,
 684                 .of_match_table = of_match_ptr(sx150x_dt_id),
 685         },
 686         .probe    = sx150x_probe,
 687         .remove   = sx150x_remove,
 688         .id_table = sx150x_id,
 689 };
 690
 691 static int __init sx150x_init(void)
 692 {
 693         return i2c_add_driver(&sx150x_driver);
 694 }
 695 subsys_initcall(sx150x_init);
 696
 697 static void __exit sx150x_exit(void)
 698 {
 699         return i2c_del_driver(&sx150x_driver);
 700 }
 701 module_exit(sx150x_exit);
 702
 703 MODULE_AUTHOR("Gregory Bean <gbean@codeaurora.org>");
 704 MODULE_DESCRIPTION("Driver for Semtech SX150X I2C GPIO Expanders");
 705 MODULE_LICENSE("GPL v2");
 706 MODULE_ALIAS("i2c:sx150x");