drivers/iio/accel/kxcjk-1013.c

   1 /*
   2  * KXCJK-1013 3-axis accelerometer driver
   3  * Copyright (c) 2014, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/i2c.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/delay.h>
  19 #include <linux/bitops.h>
  20 #include <linux/slab.h>
  21 #include <linux/string.h>
  22 #include <linux/acpi.h>
  23 #include <linux/gpio/consumer.h>
  24 #include <linux/iio/iio.h>
  25 #include <linux/iio/sysfs.h>
  26 #include <linux/iio/buffer.h>
  27 #include <linux/iio/trigger.h>
  28 #include <linux/iio/trigger_consumer.h>
  29 #include <linux/iio/triggered_buffer.h>
  30 #include <linux/iio/accel/kxcjk_1013.h>
  31
  32 #define KXCJK1013_DRV_NAME "kxcjk1013"
  33 #define KXCJK1013_IRQ_NAME "kxcjk1013_event"
  34
  35 #define KXCJK1013_REG_XOUT_L            0x06
  36 /*
  37  * From low byte X axis register, all the other addresses of Y and Z can be
  38  * obtained by just applying axis offset. The following axis defines are just
  39  * provide clarity, but not used.
  40  */
  41 #define KXCJK1013_REG_XOUT_H            0x07
  42 #define KXCJK1013_REG_YOUT_L            0x08
  43 #define KXCJK1013_REG_YOUT_H            0x09
  44 #define KXCJK1013_REG_ZOUT_L            0x0A
  45 #define KXCJK1013_REG_ZOUT_H            0x0B
  46
  47 #define KXCJK1013_REG_DCST_RESP         0x0C
  48 #define KXCJK1013_REG_WHO_AM_I          0x0F
  49 #define KXCJK1013_REG_INT_SRC1          0x16
  50 #define KXCJK1013_REG_INT_SRC2          0x17
  51 #define KXCJK1013_REG_STATUS_REG        0x18
  52 #define KXCJK1013_REG_INT_REL           0x1A
  53 #define KXCJK1013_REG_CTRL1             0x1B
  54 #define KXCJK1013_REG_CTRL2             0x1D
  55 #define KXCJK1013_REG_INT_CTRL1         0x1E
  56 #define KXCJK1013_REG_INT_CTRL2         0x1F
  57 #define KXCJK1013_REG_DATA_CTRL         0x21
  58 #define KXCJK1013_REG_WAKE_TIMER        0x29
  59 #define KXCJK1013_REG_SELF_TEST         0x3A
  60 #define KXCJK1013_REG_WAKE_THRES        0x6A
  61
  62 #define KXCJK1013_REG_CTRL1_BIT_PC1     BIT(7)
  63 #define KXCJK1013_REG_CTRL1_BIT_RES     BIT(6)
  64 #define KXCJK1013_REG_CTRL1_BIT_DRDY    BIT(5)
  65 #define KXCJK1013_REG_CTRL1_BIT_GSEL1   BIT(4)
  66 #define KXCJK1013_REG_CTRL1_BIT_GSEL0   BIT(3)
  67 #define KXCJK1013_REG_CTRL1_BIT_WUFE    BIT(1)
  68 #define KXCJK1013_REG_INT_REG1_BIT_IEA  BIT(4)
  69 #define KXCJK1013_REG_INT_REG1_BIT_IEN  BIT(5)
  70
  71 #define KXCJK1013_DATA_MASK_12_BIT      0x0FFF
  72 #define KXCJK1013_MAX_STARTUP_TIME_US   100000
  73
  74 struct kxcjk1013_data {
  75         struct i2c_client *client;
  76         struct iio_trigger *trig;
  77         bool trig_mode;
  78         struct mutex mutex;
  79         s16 buffer[8];
  80         int power_state;
  81         u8 odr_bits;
  82         bool active_high_intr;
  83 };
  84
  85 enum kxcjk1013_axis {
  86         AXIS_X,
  87         AXIS_Y,
  88         AXIS_Z,
  89 };
  90
  91 enum kxcjk1013_mode {
  92         STANDBY,
  93         OPERATION,
  94 };
  95
  96 static const struct {
  97         int val;
  98         int val2;
  99         int odr_bits;
 100 } samp_freq_table[] = { {0, 781000, 0x08}, {1, 563000, 0x09},
 101                         {3, 125000, 0x0A}, {6, 250000, 0x0B}, {12, 500000, 0},
 102                         {25, 0, 0x01}, {50, 0, 0x02}, {100, 0, 0x03},
 103                         {200, 0, 0x04}, {400, 0, 0x05}, {800, 0, 0x06},
 104                         {1600, 0, 0x07} };
 105
 106 /* Refer to section 4 of the specification */
 107 static const struct {
 108         int odr_bits;
 109         int usec;
 110 } odr_start_up_times[] = { {0x08, 100000}, {0x09, 100000}, {0x0A, 100000},
 111                            {0x0B, 100000}, { 0, 80000}, {0x01, 41000},
 112                            {0x02, 21000}, {0x03, 11000}, {0x04, 6400},
 113                            {0x05, 3900}, {0x06, 2700}, {0x07, 2100} };
 114
 115 static int kxcjk1013_set_mode(struct kxcjk1013_data *data,
 116                               enum kxcjk1013_mode mode)
 117 {
 118         int ret;
 119
 120         ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_CTRL1);
 121         if (ret < 0) {
 122                 dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
 123                 return ret;
 124         }
 125
 126         if (mode == STANDBY)
 127                 ret &= ~KXCJK1013_REG_CTRL1_BIT_PC1;
 128         else
 129                 ret |= KXCJK1013_REG_CTRL1_BIT_PC1;
 130
 131         ret = i2c_smbus_write_byte_data(data->client,
 132                                         KXCJK1013_REG_CTRL1, ret);
 133         if (ret < 0) {
 134                 dev_err(&data->client->dev, "Error writing reg_ctrl1\n");
 135                 return ret;
 136         }
 137
 138         return 0;
 139 }
 140
 141 static int kxcjk1013_chip_ack_intr(struct kxcjk1013_data *data)
 142 {
 143         int ret;
 144
 145         ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_INT_REL);
 146         if (ret < 0) {
 147                 dev_err(&data->client->dev, "Error writing reg_int_rel\n");
 148                 return ret;
 149         }
 150
 151         return ret;
 152 }
 153
 154 static int kxcjk1013_chip_init(struct kxcjk1013_data *data)
 155 {
 156         int ret;
 157
 158         ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_WHO_AM_I);
 159         if (ret < 0) {
 160                 dev_err(&data->client->dev, "Error reading who_am_i\n");
 161                 return ret;
 162         }
 163
 164         dev_dbg(&data->client->dev, "KXCJK1013 Chip Id %x\n", ret);
 165
 166         ret = kxcjk1013_set_mode(data, STANDBY);
 167         if (ret < 0)
 168                 return ret;
 169
 170         ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_CTRL1);
 171         if (ret < 0) {
 172                 dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
 173                 return ret;
 174         }
 175
 176         /* Setting range to 4G */
 177         ret |= KXCJK1013_REG_CTRL1_BIT_GSEL0;
 178         ret &= ~KXCJK1013_REG_CTRL1_BIT_GSEL1;
 179
 180         /* Set 12 bit mode */
 181         ret |= KXCJK1013_REG_CTRL1_BIT_RES;
 182
 183         ret = i2c_smbus_write_byte_data(data->client, KXCJK1013_REG_CTRL1,
 184                                         ret);
 185         if (ret < 0) {
 186                 dev_err(&data->client->dev, "Error reading reg_ctrl\n");
 187                 return ret;
 188         }
 189
 190         ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_DATA_CTRL);
 191         if (ret < 0) {
 192                 dev_err(&data->client->dev, "Error reading reg_data_ctrl\n");
 193                 return ret;
 194         }
 195
 196         data->odr_bits = ret;
 197
 198         /* Set up INT polarity */
 199         ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_INT_CTRL1);
 200         if (ret < 0) {
 201                 dev_err(&data->client->dev, "Error reading reg_int_ctrl1\n");
 202                 return ret;
 203         }
 204
 205         if (data->active_high_intr)
 206                 ret |= KXCJK1013_REG_INT_REG1_BIT_IEA;
 207         else
 208                 ret &= ~KXCJK1013_REG_INT_REG1_BIT_IEA;
 209
 210         ret = i2c_smbus_write_byte_data(data->client, KXCJK1013_REG_INT_CTRL1,
 211                                         ret);
 212         if (ret < 0) {
 213                 dev_err(&data->client->dev, "Error writing reg_int_ctrl1\n");
 214                 return ret;
 215         }
 216
 217         return 0;
 218 }
 219
 220 static int kxcjk1013_chip_setup_interrupt(struct kxcjk1013_data *data,
 221                                           bool status)
 222 {
 223         int ret;
 224
 225         /* This is requirement by spec to change state to STANDBY */
 226         ret = kxcjk1013_set_mode(data, STANDBY);
 227         if (ret < 0)
 228                 return ret;
 229
 230         ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_INT_CTRL1);
 231         if (ret < 0) {
 232                 dev_err(&data->client->dev, "Error reading reg_int_ctrl1\n");
 233                 return ret;
 234         }
 235
 236         if (status)
 237                 ret |= KXCJK1013_REG_INT_REG1_BIT_IEN;
 238         else
 239                 ret &= ~KXCJK1013_REG_INT_REG1_BIT_IEN;
 240
 241         ret = i2c_smbus_write_byte_data(data->client, KXCJK1013_REG_INT_CTRL1,
 242                                         ret);
 243         if (ret < 0) {
 244                 dev_err(&data->client->dev, "Error writing reg_int_ctrl1\n");
 245                 return ret;
 246         }
 247
 248         ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_CTRL1);
 249         if (ret < 0) {
 250                 dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
 251                 return ret;
 252         }
 253
 254         if (status)
 255                 ret |= KXCJK1013_REG_CTRL1_BIT_DRDY;
 256         else
 257                 ret &= ~KXCJK1013_REG_CTRL1_BIT_DRDY;
 258
 259         ret = i2c_smbus_write_byte_data(data->client,
 260                                         KXCJK1013_REG_CTRL1, ret);
 261         if (ret < 0) {
 262                 dev_err(&data->client->dev, "Error writing reg_ctrl1\n");
 263                 return ret;
 264         }
 265
 266         return ret;
 267 }
 268
 269 static int kxcjk1013_convert_freq_to_bit(int val, int val2)
 270 {
 271         int i;
 272
 273         for (i = 0; i < ARRAY_SIZE(samp_freq_table); ++i) {
 274                 if (samp_freq_table[i].val == val &&
 275                         samp_freq_table[i].val2 == val2) {
 276                         return samp_freq_table[i].odr_bits;
 277                 }
 278         }
 279
 280         return -EINVAL;
 281 }
 282
 283 static int kxcjk1013_set_odr(struct kxcjk1013_data *data, int val, int val2)
 284 {
 285         int ret;
 286         int odr_bits;
 287
 288         odr_bits = kxcjk1013_convert_freq_to_bit(val, val2);
 289         if (odr_bits < 0)
 290                 return odr_bits;
 291
 292         /* To change ODR, the chip must be set to STANDBY as per spec */
 293         ret = kxcjk1013_set_mode(data, STANDBY);
 294         if (ret < 0)
 295                 return ret;
 296
 297         ret = i2c_smbus_write_byte_data(data->client, KXCJK1013_REG_DATA_CTRL,
 298                                         odr_bits);
 299         if (ret < 0) {
 300                 dev_err(&data->client->dev, "Error writing data_ctrl\n");
 301                 return ret;
 302         }
 303
 304         data->odr_bits = odr_bits;
 305
 306         /* Check, if the ODR is changed after data enable */
 307         if (data->power_state) {
 308                 /* Set the state back to operation */
 309                 ret = kxcjk1013_set_mode(data, OPERATION);
 310                 if (ret < 0)
 311                         return ret;
 312         }
 313
 314         return 0;
 315 }
 316
 317 static int kxcjk1013_get_odr(struct kxcjk1013_data *data, int *val, int *val2)
 318 {
 319         int i;
 320
 321         for (i = 0; i < ARRAY_SIZE(samp_freq_table); ++i) {
 322                 if (samp_freq_table[i].odr_bits == data->odr_bits) {
 323                         *val = samp_freq_table[i].val;
 324                         *val2 = samp_freq_table[i].val2;
 325                         return IIO_VAL_INT_PLUS_MICRO;
 326                 }
 327         }
 328
 329         return -EINVAL;
 330 }
 331
 332 static int kxcjk1013_get_acc_reg(struct kxcjk1013_data *data, int axis)
 333 {
 334         u8 reg = KXCJK1013_REG_XOUT_L + axis * 2;
 335         int ret;
 336
 337         ret = i2c_smbus_read_word_data(data->client, reg);
 338         if (ret < 0) {
 339                 dev_err(&data->client->dev,
 340                         "failed to read accel_%c registers\n", 'x' + axis);
 341                 return ret;
 342         }
 343
 344         return ret;
 345 }
 346
 347 static int kxcjk1013_get_startup_times(struct kxcjk1013_data *data)
 348 {
 349         int i;
 350
 351         for (i = 0; i < ARRAY_SIZE(odr_start_up_times); ++i) {
 352                 if (odr_start_up_times[i].odr_bits == data->odr_bits)
 353                         return odr_start_up_times[i].usec;
 354         }
 355
 356         return KXCJK1013_MAX_STARTUP_TIME_US;
 357 }
 358
 359 static int kxcjk1013_read_raw(struct iio_dev *indio_dev,
 360                               struct iio_chan_spec const *chan, int *val,
 361                               int *val2, long mask)
 362 {
 363         struct kxcjk1013_data *data = iio_priv(indio_dev);
 364         int ret;
 365
 366         switch (mask) {
 367         case IIO_CHAN_INFO_RAW:
 368                 mutex_lock(&data->mutex);
 369                 if (iio_buffer_enabled(indio_dev))
 370                         ret = -EBUSY;
 371                 else {
 372                         int sleep_val;
 373
 374                         ret = kxcjk1013_set_mode(data, OPERATION);
 375                         if (ret < 0) {
 376                                 mutex_unlock(&data->mutex);
 377                                 return ret;
 378                         }
 379                         ++data->power_state;
 380                         sleep_val = kxcjk1013_get_startup_times(data);
 381                         if (sleep_val < 20000)
 382                                 usleep_range(sleep_val, 20000);
 383                         else
 384                                 msleep_interruptible(sleep_val/1000);
 385                         ret = kxcjk1013_get_acc_reg(data, chan->scan_index);
 386                         if (--data->power_state == 0)
 387                                 kxcjk1013_set_mode(data, STANDBY);
 388                 }
 389                 mutex_unlock(&data->mutex);
 390
 391                 if (ret < 0)
 392                         return ret;
 393
 394                 *val = sign_extend32(ret >> 4, 11);
 395                 return IIO_VAL_INT;
 396
 397         case IIO_CHAN_INFO_SCALE:
 398                 *val = 0;
 399                 *val2 = 19163; /* range +-4g (4/2047*9.806650) */
 400                 return IIO_VAL_INT_PLUS_MICRO;
 401
 402         case IIO_CHAN_INFO_SAMP_FREQ:
 403                 mutex_lock(&data->mutex);
 404                 ret = kxcjk1013_get_odr(data, val, val2);
 405                 mutex_unlock(&data->mutex);
 406                 return ret;
 407
 408         default:
 409                 return -EINVAL;
 410         }
 411 }
 412
 413 static int kxcjk1013_write_raw(struct iio_dev *indio_dev,
 414                                struct iio_chan_spec const *chan, int val,
 415                                int val2, long mask)
 416 {
 417         struct kxcjk1013_data *data = iio_priv(indio_dev);
 418         int ret;
 419
 420         switch (mask) {
 421         case IIO_CHAN_INFO_SAMP_FREQ:
 422                 mutex_lock(&data->mutex);
 423                 ret = kxcjk1013_set_odr(data, val, val2);
 424                 mutex_unlock(&data->mutex);
 425                 break;
 426         default:
 427                 ret = -EINVAL;
 428         }
 429
 430         return ret;
 431 }
 432
 433 static int kxcjk1013_validate_trigger(struct iio_dev *indio_dev,
 434                                       struct iio_trigger *trig)
 435 {
 436         struct kxcjk1013_data *data = iio_priv(indio_dev);
 437
 438         if (data->trig != trig)
 439                 return -EINVAL;
 440
 441         return 0;
 442 }
 443
 444 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
 445         "0.781000 1.563000 3.125000 6.250000 12.500000 25 50 100 200 400 800 1600");
 446
 447 static struct attribute *kxcjk1013_attributes[] = {
 448         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 449         NULL,
 450 };
 451
 452 static const struct attribute_group kxcjk1013_attrs_group = {
 453         .attrs = kxcjk1013_attributes,
 454 };
 455
 456 #define KXCJK1013_CHANNEL(_axis) {                                      \
 457         .type = IIO_ACCEL,                                              \
 458         .modified = 1,                                                  \
 459         .channel2 = IIO_MOD_##_axis,                                    \
 460         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),                   \
 461         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |          \
 462                                 BIT(IIO_CHAN_INFO_SAMP_FREQ),           \
 463         .scan_index = AXIS_##_axis,                                     \
 464         .scan_type = {                                                  \
 465                 .sign = 's',                                            \
 466                 .realbits = 12,                                         \
 467                 .storagebits = 16,                                      \
 468                 .shift = 4,                                             \
 469                 .endianness = IIO_LE,                                   \
 470         },                                                              \
 471 }
 472
 473 static const struct iio_chan_spec kxcjk1013_channels[] = {
 474         KXCJK1013_CHANNEL(X),
 475         KXCJK1013_CHANNEL(Y),
 476         KXCJK1013_CHANNEL(Z),
 477         IIO_CHAN_SOFT_TIMESTAMP(3),
 478 };
 479
 480 static const struct iio_info kxcjk1013_info = {
 481         .attrs                  = &kxcjk1013_attrs_group,
 482         .read_raw               = kxcjk1013_read_raw,
 483         .write_raw              = kxcjk1013_write_raw,
 484         .validate_trigger       = kxcjk1013_validate_trigger,
 485         .driver_module          = THIS_MODULE,
 486 };
 487
 488 static irqreturn_t kxcjk1013_trigger_handler(int irq, void *p)
 489 {
 490         struct iio_poll_func *pf = p;
 491         struct iio_dev *indio_dev = pf->indio_dev;
 492         struct kxcjk1013_data *data = iio_priv(indio_dev);
 493         int bit, ret, i = 0;
 494
 495         mutex_lock(&data->mutex);
 496
 497         for_each_set_bit(bit, indio_dev->buffer->scan_mask,
 498                          indio_dev->masklength) {
 499                 ret = kxcjk1013_get_acc_reg(data, bit);
 500                 if (ret < 0) {
 501                         kxcjk1013_chip_ack_intr(data);
 502                         mutex_unlock(&data->mutex);
 503                         goto err;
 504                 }
 505                 data->buffer[i++] = ret;
 506         }
 507
 508         kxcjk1013_chip_ack_intr(data);
 509
 510         mutex_unlock(&data->mutex);
 511
 512         iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
 513                                            pf->timestamp);
 514 err:
 515         iio_trigger_notify_done(indio_dev->trig);
 516
 517         return IRQ_HANDLED;
 518 }
 519
 520 static int kxcjk1013_data_rdy_trigger_set_state(struct iio_trigger *trig,
 521                                                 bool state)
 522 {
 523         struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 524         struct kxcjk1013_data *data = iio_priv(indio_dev);
 525
 526         mutex_lock(&data->mutex);
 527         if (state) {
 528                 kxcjk1013_chip_setup_interrupt(data, true);
 529                 kxcjk1013_set_mode(data, OPERATION);
 530                 ++data->power_state;
 531         } else {
 532                 if (--data->power_state) {
 533                         mutex_unlock(&data->mutex);
 534                         return 0;
 535                 }
 536                 kxcjk1013_chip_setup_interrupt(data, false);
 537                 kxcjk1013_set_mode(data, STANDBY);
 538         }
 539         mutex_unlock(&data->mutex);
 540
 541         return 0;
 542 }
 543
 544 static const struct iio_trigger_ops kxcjk1013_trigger_ops = {
 545         .set_trigger_state = kxcjk1013_data_rdy_trigger_set_state,
 546         .owner = THIS_MODULE,
 547 };
 548
 549 static int kxcjk1013_acpi_gpio_probe(struct i2c_client *client,
 550                                      struct kxcjk1013_data *data)
 551 {
 552         const struct acpi_device_id *id;
 553         struct device *dev;
 554         struct gpio_desc *gpio;
 555         int ret;
 556
 557         if (!client)
 558                 return -EINVAL;
 559
 560         dev = &client->dev;
 561         if (!ACPI_HANDLE(dev))
 562                 return -ENODEV;
 563
 564         id = acpi_match_device(dev->driver->acpi_match_table, dev);
 565         if (!id)
 566                 return -ENODEV;
 567
 568         /* data ready gpio interrupt pin */
 569         gpio = devm_gpiod_get_index(dev, "kxcjk1013_int", 0);
 570         if (IS_ERR(gpio)) {
 571                 dev_err(dev, "acpi gpio get index failed\n");
 572                 return PTR_ERR(gpio);
 573         }
 574
 575         ret = gpiod_direction_input(gpio);
 576         if (ret)
 577                 return ret;
 578
 579         ret = gpiod_to_irq(gpio);
 580
 581         dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
 582
 583         return ret;
 584 }
 585
 586 static int kxcjk1013_probe(struct i2c_client *client,
 587                            const struct i2c_device_id *id)
 588 {
 589         struct kxcjk1013_data *data;
 590         struct iio_dev *indio_dev;
 591         struct iio_trigger *trig = NULL;
 592         struct kxcjk_1013_platform_data *pdata;
 593         int ret;
 594
 595         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 596         if (!indio_dev)
 597                 return -ENOMEM;
 598
 599         data = iio_priv(indio_dev);
 600         i2c_set_clientdata(client, indio_dev);
 601         data->client = client;
 602
 603         pdata = dev_get_platdata(&client->dev);
 604         if (pdata)
 605                 data->active_high_intr = pdata->active_high_intr;
 606         else
 607                 data->active_high_intr = true; /* default polarity */
 608
 609         ret = kxcjk1013_chip_init(data);
 610         if (ret < 0)
 611                 return ret;
 612
 613         mutex_init(&data->mutex);
 614
 615         indio_dev->dev.parent = &client->dev;
 616         indio_dev->channels = kxcjk1013_channels;
 617         indio_dev->num_channels = ARRAY_SIZE(kxcjk1013_channels);
 618         indio_dev->name = KXCJK1013_DRV_NAME;
 619         indio_dev->modes = INDIO_DIRECT_MODE;
 620         indio_dev->info = &kxcjk1013_info;
 621
 622         if (client->irq < 0)
 623                 client->irq = kxcjk1013_acpi_gpio_probe(client, data);
 624
 625         if (client->irq >= 0) {
 626                 trig = iio_trigger_alloc("%s-dev%d", indio_dev->name,
 627                                          indio_dev->id);
 628                 if (!trig)
 629                         return -ENOMEM;
 630
 631                 data->trig_mode = true;
 632
 633                 ret = devm_request_irq(&client->dev, client->irq,
 634                                         iio_trigger_generic_data_rdy_poll,
 635                                         IRQF_TRIGGER_RISING,
 636                                         KXCJK1013_IRQ_NAME,
 637                                         trig);
 638                 if (ret) {
 639                         dev_err(&client->dev, "unable to request IRQ\n");
 640                         goto err_trigger_free;
 641                 }
 642
 643                 trig->dev.parent = &client->dev;
 644                 trig->ops = &kxcjk1013_trigger_ops;
 645                 iio_trigger_set_drvdata(trig, indio_dev);
 646                 data->trig = trig;
 647                 indio_dev->trig = trig;
 648
 649                 ret = iio_trigger_register(trig);
 650                 if (ret)
 651                         goto err_trigger_free;
 652
 653                 ret = iio_triggered_buffer_setup(indio_dev,
 654                                                 &iio_pollfunc_store_time,
 655                                                 kxcjk1013_trigger_handler,
 656                                                 NULL);
 657                 if (ret < 0) {
 658                         dev_err(&client->dev,
 659                                         "iio triggered buffer setup failed\n");
 660                         goto err_trigger_unregister;
 661                 }
 662         }
 663
 664         ret = devm_iio_device_register(&client->dev, indio_dev);
 665         if (ret < 0) {
 666                 dev_err(&client->dev, "unable to register iio device\n");
 667                 goto err_buffer_cleanup;
 668         }
 669
 670         return 0;
 671
 672 err_buffer_cleanup:
 673         if (data->trig_mode)
 674                 iio_triggered_buffer_cleanup(indio_dev);
 675 err_trigger_unregister:
 676         if (data->trig_mode)
 677                 iio_trigger_unregister(trig);
 678 err_trigger_free:
 679         if (data->trig_mode)
 680                 iio_trigger_free(trig);
 681
 682         return ret;
 683 }
 684
 685 static int kxcjk1013_remove(struct i2c_client *client)
 686 {
 687         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 688         struct kxcjk1013_data *data = iio_priv(indio_dev);
 689
 690         if (data->trig_mode) {
 691                 iio_triggered_buffer_cleanup(indio_dev);
 692                 iio_trigger_unregister(data->trig);
 693                 iio_trigger_free(data->trig);
 694         }
 695
 696         mutex_lock(&data->mutex);
 697         kxcjk1013_set_mode(data, STANDBY);
 698         mutex_unlock(&data->mutex);
 699
 700         return 0;
 701 }
 702
 703 #ifdef CONFIG_PM_SLEEP
 704 static int kxcjk1013_suspend(struct device *dev)
 705 {
 706         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 707         struct kxcjk1013_data *data = iio_priv(indio_dev);
 708
 709         mutex_lock(&data->mutex);
 710         kxcjk1013_set_mode(data, STANDBY);
 711         mutex_unlock(&data->mutex);
 712
 713         return 0;
 714 }
 715
 716 static int kxcjk1013_resume(struct device *dev)
 717 {
 718         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 719         struct kxcjk1013_data *data = iio_priv(indio_dev);
 720
 721         mutex_lock(&data->mutex);
 722
 723         if (data->power_state)
 724                 kxcjk1013_set_mode(data, OPERATION);
 725
 726         mutex_unlock(&data->mutex);
 727
 728         return 0;
 729 }
 730
 731 static SIMPLE_DEV_PM_OPS(kxcjk1013_pm_ops, kxcjk1013_suspend, kxcjk1013_resume);
 732 #define KXCJK1013_PM_OPS (&kxcjk1013_pm_ops)
 733 #else
 734 #define KXCJK1013_PM_OPS NULL
 735 #endif
 736
 737 static const struct acpi_device_id kx_acpi_match[] = {
 738         {"KXCJ1013", 0},
 739         { },
 740 };
 741 MODULE_DEVICE_TABLE(acpi, kx_acpi_match);
 742
 743 static const struct i2c_device_id kxcjk1013_id[] = {
 744         {"kxcjk1013", 0},
 745         {}
 746 };
 747
 748 MODULE_DEVICE_TABLE(i2c, kxcjk1013_id);
 749
 750 static struct i2c_driver kxcjk1013_driver = {
 751         .driver = {
 752                 .name   = KXCJK1013_DRV_NAME,
 753                 .acpi_match_table = ACPI_PTR(kx_acpi_match),
 754                 .pm     = KXCJK1013_PM_OPS,
 755         },
 756         .probe          = kxcjk1013_probe,
 757         .remove         = kxcjk1013_remove,
 758         .id_table       = kxcjk1013_id,
 759 };
 760 module_i2c_driver(kxcjk1013_driver);
 761
 762 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
 763 MODULE_LICENSE("GPL v2");
 764 MODULE_DESCRIPTION("KXCJK1013 accelerometer driver");