drivers/iio/accel/stk8312.c

   1 /**
   2  * Sensortek STK8312 3-Axis Accelerometer
   3  *
   4  * Copyright (c) 2015, Intel Corporation.
   5  *
   6  * This file is subject to the terms and conditions of version 2 of
   7  * the GNU General Public License. See the file COPYING in the main
   8  * directory of this archive for more details.
   9  *
  10  * IIO driver for STK8312; 7-bit I2C address: 0x3D.
  11  */
  12
  13 #include <linux/acpi.h>
  14 #include <linux/i2c.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/delay.h>
  19 #include <linux/iio/buffer.h>
  20 #include <linux/iio/iio.h>
  21 #include <linux/iio/sysfs.h>
  22 #include <linux/iio/trigger.h>
  23 #include <linux/iio/triggered_buffer.h>
  24 #include <linux/iio/trigger_consumer.h>
  25
  26 #define STK8312_REG_XOUT                0x00
  27 #define STK8312_REG_YOUT                0x01
  28 #define STK8312_REG_ZOUT                0x02
  29 #define STK8312_REG_INTSU               0x06
  30 #define STK8312_REG_MODE                0x07
  31 #define STK8312_REG_SR                  0x08
  32 #define STK8312_REG_STH                 0x13
  33 #define STK8312_REG_RESET               0x20
  34 #define STK8312_REG_AFECTRL             0x24
  35 #define STK8312_REG_OTPADDR             0x3D
  36 #define STK8312_REG_OTPDATA             0x3E
  37 #define STK8312_REG_OTPCTRL             0x3F
  38
  39 #define STK8312_MODE_ACTIVE             BIT(0)
  40 #define STK8312_MODE_STANDBY            0x00
  41 #define STK8312_MODE_INT_AH_PP          0xC0    /* active-high, push-pull */
  42 #define STK8312_DREADY_BIT              BIT(4)
  43 #define STK8312_RNG_6G                  1
  44 #define STK8312_RNG_SHIFT               6
  45 #define STK8312_RNG_MASK                GENMASK(7, 6)
  46 #define STK8312_SR_MASK                 GENMASK(2, 0)
  47 #define STK8312_SR_400HZ_IDX            0
  48 #define STK8312_ALL_CHANNEL_MASK        GENMASK(2, 0)
  49 #define STK8312_ALL_CHANNEL_SIZE        3
  50
  51 #define STK8312_DRIVER_NAME             "stk8312"
  52 #define STK8312_IRQ_NAME                "stk8312_event"
  53
  54 /*
  55  * The accelerometer has two measurement ranges:
  56  *
  57  * -6g - +6g (8-bit, signed)
  58  * -16g - +16g (8-bit, signed)
  59  *
  60  * scale1 = (6 + 6) * 9.81 / (2^8 - 1)     = 0.4616
  61  * scale2 = (16 + 16) * 9.81 / (2^8 - 1)   = 1.2311
  62  */
  63 #define STK8312_SCALE_AVAIL             "0.4616 1.2311"
  64
  65 static const int stk8312_scale_table[][2] = {
  66         {0, 461600}, {1, 231100}
  67 };
  68
  69 static const struct {
  70         int val;
  71         int val2;
  72 } stk8312_samp_freq_table[] = {
  73         {400, 0}, {200, 0}, {100, 0}, {50, 0}, {25, 0},
  74         {12, 500000}, {6, 250000}, {3, 125000}
  75 };
  76
  77 #define STK8312_ACCEL_CHANNEL(index, reg, axis) {                       \
  78         .type = IIO_ACCEL,                                              \
  79         .address = reg,                                                 \
  80         .modified = 1,                                                  \
  81         .channel2 = IIO_MOD_##axis,                                     \
  82         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),                   \
  83         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |          \
  84                                     BIT(IIO_CHAN_INFO_SAMP_FREQ),       \
  85         .scan_index = index,                                            \
  86         .scan_type = {                                                  \
  87                 .sign = 's',                                            \
  88                 .realbits = 8,                                          \
  89                 .storagebits = 8,                                       \
  90                 .endianness = IIO_CPU,                                  \
  91         },                                                              \
  92 }
  93
  94 static const struct iio_chan_spec stk8312_channels[] = {
  95         STK8312_ACCEL_CHANNEL(0, STK8312_REG_XOUT, X),
  96         STK8312_ACCEL_CHANNEL(1, STK8312_REG_YOUT, Y),
  97         STK8312_ACCEL_CHANNEL(2, STK8312_REG_ZOUT, Z),
  98         IIO_CHAN_SOFT_TIMESTAMP(3),
  99 };
 100
 101 struct stk8312_data {
 102         struct i2c_client *client;
 103         struct mutex lock;
 104         u8 range;
 105         u8 sample_rate_idx;
 106         u8 mode;
 107         struct iio_trigger *dready_trig;
 108         bool dready_trigger_on;
 109         /* Ensure timestamp is naturally aligned */
 110         struct {
 111                 s8 chans[3];
 112                 s64 timestamp __aligned(8);
 113         } scan;
 114 };
 115
 116 static IIO_CONST_ATTR(in_accel_scale_available, STK8312_SCALE_AVAIL);
 117
 118 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("3.125 6.25 12.5 25 50 100 200 400");
 119
 120 static struct attribute *stk8312_attributes[] = {
 121         &iio_const_attr_in_accel_scale_available.dev_attr.attr,
 122         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 123         NULL,
 124 };
 125
 126 static const struct attribute_group stk8312_attribute_group = {
 127         .attrs = stk8312_attributes
 128 };
 129
 130 static int stk8312_otp_init(struct stk8312_data *data)
 131 {
 132         int ret;
 133         int count = 10;
 134         struct i2c_client *client = data->client;
 135
 136         ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPADDR, 0x70);
 137         if (ret < 0)
 138                 goto exit_err;
 139         ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPCTRL, 0x02);
 140         if (ret < 0)
 141                 goto exit_err;
 142
 143         do {
 144                 usleep_range(1000, 5000);
 145                 ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPCTRL);
 146                 if (ret < 0)
 147                         goto exit_err;
 148                 count--;
 149         } while (!(ret & BIT(7)) && count > 0);
 150
 151         if (count == 0) {
 152                 ret = -ETIMEDOUT;
 153                 goto exit_err;
 154         }
 155
 156         ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPDATA);
 157         if (ret == 0)
 158                 ret = -EINVAL;
 159         if (ret < 0)
 160                 goto exit_err;
 161
 162         ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_AFECTRL, ret);
 163         if (ret < 0)
 164                 goto exit_err;
 165         msleep(150);
 166
 167         return 0;
 168
 169 exit_err:
 170         dev_err(&client->dev, "failed to initialize sensor\n");
 171         return ret;
 172 }
 173
 174 static int stk8312_set_mode(struct stk8312_data *data, u8 mode)
 175 {
 176         int ret;
 177         struct i2c_client *client = data->client;
 178
 179         if (mode == data->mode)
 180                 return 0;
 181
 182         ret = i2c_smbus_write_byte_data(client, STK8312_REG_MODE, mode);
 183         if (ret < 0) {
 184                 dev_err(&client->dev, "failed to change sensor mode\n");
 185                 return ret;
 186         }
 187
 188         data->mode = mode;
 189         if (mode & STK8312_MODE_ACTIVE) {
 190                 /* Need to run OTP sequence before entering active mode */
 191                 usleep_range(1000, 5000);
 192                 ret = stk8312_otp_init(data);
 193         }
 194
 195         return ret;
 196 }
 197
 198 static int stk8312_set_interrupts(struct stk8312_data *data, u8 int_mask)
 199 {
 200         int ret;
 201         u8 mode;
 202         struct i2c_client *client = data->client;
 203
 204         mode = data->mode;
 205         /* We need to go in standby mode to modify registers */
 206         ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
 207         if (ret < 0)
 208                 return ret;
 209
 210         ret = i2c_smbus_write_byte_data(client, STK8312_REG_INTSU, int_mask);
 211         if (ret < 0) {
 212                 dev_err(&client->dev, "failed to set interrupts\n");
 213                 stk8312_set_mode(data, mode);
 214                 return ret;
 215         }
 216
 217         return stk8312_set_mode(data, mode);
 218 }
 219
 220 static int stk8312_data_rdy_trigger_set_state(struct iio_trigger *trig,
 221                                               bool state)
 222 {
 223         struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 224         struct stk8312_data *data = iio_priv(indio_dev);
 225         int ret;
 226
 227         if (state)
 228                 ret = stk8312_set_interrupts(data, STK8312_DREADY_BIT);
 229         else
 230                 ret = stk8312_set_interrupts(data, 0x00);
 231
 232         if (ret < 0) {
 233                 dev_err(&data->client->dev, "failed to set trigger state\n");
 234                 return ret;
 235         }
 236
 237         data->dready_trigger_on = state;
 238
 239         return 0;
 240 }
 241
 242 static const struct iio_trigger_ops stk8312_trigger_ops = {
 243         .set_trigger_state = stk8312_data_rdy_trigger_set_state,
 244 };
 245
 246 static int stk8312_set_sample_rate(struct stk8312_data *data, u8 rate)
 247 {
 248         int ret;
 249         u8 masked_reg;
 250         u8 mode;
 251         struct i2c_client *client = data->client;
 252
 253         if (rate == data->sample_rate_idx)
 254                 return 0;
 255
 256         mode = data->mode;
 257         /* We need to go in standby mode to modify registers */
 258         ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
 259         if (ret < 0)
 260                 return ret;
 261
 262         ret = i2c_smbus_read_byte_data(client, STK8312_REG_SR);
 263         if (ret < 0)
 264                 goto err_activate;
 265
 266         masked_reg = (ret & (~STK8312_SR_MASK)) | rate;
 267
 268         ret = i2c_smbus_write_byte_data(client, STK8312_REG_SR, masked_reg);
 269         if (ret < 0)
 270                 goto err_activate;
 271
 272         data->sample_rate_idx = rate;
 273
 274         return stk8312_set_mode(data, mode);
 275
 276 err_activate:
 277         dev_err(&client->dev, "failed to set sampling rate\n");
 278         stk8312_set_mode(data, mode);
 279
 280         return ret;
 281 }
 282
 283 static int stk8312_set_range(struct stk8312_data *data, u8 range)
 284 {
 285         int ret;
 286         u8 masked_reg;
 287         u8 mode;
 288         struct i2c_client *client = data->client;
 289
 290         if (range != 1 && range != 2)
 291                 return -EINVAL;
 292         else if (range == data->range)
 293                 return 0;
 294
 295         mode = data->mode;
 296         /* We need to go in standby mode to modify registers */
 297         ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
 298         if (ret < 0)
 299                 return ret;
 300
 301         ret = i2c_smbus_read_byte_data(client, STK8312_REG_STH);
 302         if (ret < 0)
 303                 goto err_activate;
 304
 305         masked_reg = ret & (~STK8312_RNG_MASK);
 306         masked_reg |= range << STK8312_RNG_SHIFT;
 307
 308         ret = i2c_smbus_write_byte_data(client, STK8312_REG_STH, masked_reg);
 309         if (ret < 0)
 310                 goto err_activate;
 311
 312         data->range = range;
 313
 314         return stk8312_set_mode(data, mode);
 315
 316 err_activate:
 317         dev_err(&client->dev, "failed to change sensor range\n");
 318         stk8312_set_mode(data, mode);
 319
 320         return ret;
 321 }
 322
 323 static int stk8312_read_accel(struct stk8312_data *data, u8 address)
 324 {
 325         int ret;
 326         struct i2c_client *client = data->client;
 327
 328         if (address > 2)
 329                 return -EINVAL;
 330
 331         ret = i2c_smbus_read_byte_data(client, address);
 332         if (ret < 0)
 333                 dev_err(&client->dev, "register read failed\n");
 334
 335         return ret;
 336 }
 337
 338 static int stk8312_read_raw(struct iio_dev *indio_dev,
 339                             struct iio_chan_spec const *chan,
 340                             int *val, int *val2, long mask)
 341 {
 342         struct stk8312_data *data = iio_priv(indio_dev);
 343         int ret;
 344
 345         switch (mask) {
 346         case IIO_CHAN_INFO_RAW:
 347                 if (iio_buffer_enabled(indio_dev))
 348                         return -EBUSY;
 349                 mutex_lock(&data->lock);
 350                 ret = stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
 351                 if (ret < 0) {
 352                         mutex_unlock(&data->lock);
 353                         return ret;
 354                 }
 355                 ret = stk8312_read_accel(data, chan->address);
 356                 if (ret < 0) {
 357                         stk8312_set_mode(data,
 358                                          data->mode & (~STK8312_MODE_ACTIVE));
 359                         mutex_unlock(&data->lock);
 360                         return ret;
 361                 }
 362                 *val = sign_extend32(ret, 7);
 363                 ret = stk8312_set_mode(data,
 364                                        data->mode & (~STK8312_MODE_ACTIVE));
 365                 mutex_unlock(&data->lock);
 366                 if (ret < 0)
 367                         return ret;
 368                 return IIO_VAL_INT;
 369         case IIO_CHAN_INFO_SCALE:
 370                 *val = stk8312_scale_table[data->range - 1][0];
 371                 *val2 = stk8312_scale_table[data->range - 1][1];
 372                 return IIO_VAL_INT_PLUS_MICRO;
 373         case IIO_CHAN_INFO_SAMP_FREQ:
 374                 *val = stk8312_samp_freq_table[data->sample_rate_idx].val;
 375                 *val2 = stk8312_samp_freq_table[data->sample_rate_idx].val2;
 376                 return IIO_VAL_INT_PLUS_MICRO;
 377         }
 378
 379         return -EINVAL;
 380 }
 381
 382 static int stk8312_write_raw(struct iio_dev *indio_dev,
 383                              struct iio_chan_spec const *chan,
 384                              int val, int val2, long mask)
 385 {
 386         int i;
 387         int index = -1;
 388         int ret;
 389         struct stk8312_data *data = iio_priv(indio_dev);
 390
 391         switch (mask) {
 392         case IIO_CHAN_INFO_SCALE:
 393                 for (i = 0; i < ARRAY_SIZE(stk8312_scale_table); i++)
 394                         if (val == stk8312_scale_table[i][0] &&
 395                             val2 == stk8312_scale_table[i][1]) {
 396                                 index = i + 1;
 397                                 break;
 398                         }
 399                 if (index < 0)
 400                         return -EINVAL;
 401
 402                 mutex_lock(&data->lock);
 403                 ret = stk8312_set_range(data, index);
 404                 mutex_unlock(&data->lock);
 405
 406                 return ret;
 407         case IIO_CHAN_INFO_SAMP_FREQ:
 408                 for (i = 0; i < ARRAY_SIZE(stk8312_samp_freq_table); i++)
 409                         if (val == stk8312_samp_freq_table[i].val &&
 410                             val2 == stk8312_samp_freq_table[i].val2) {
 411                                 index = i;
 412                                 break;
 413                         }
 414                 if (index < 0)
 415                         return -EINVAL;
 416                 mutex_lock(&data->lock);
 417                 ret = stk8312_set_sample_rate(data, index);
 418                 mutex_unlock(&data->lock);
 419
 420                 return ret;
 421         }
 422
 423         return -EINVAL;
 424 }
 425
 426 static const struct iio_info stk8312_info = {
 427         .read_raw               = stk8312_read_raw,
 428         .write_raw              = stk8312_write_raw,
 429         .attrs                  = &stk8312_attribute_group,
 430 };
 431
 432 static irqreturn_t stk8312_trigger_handler(int irq, void *p)
 433 {
 434         struct iio_poll_func *pf = p;
 435         struct iio_dev *indio_dev = pf->indio_dev;
 436         struct stk8312_data *data = iio_priv(indio_dev);
 437         int bit, ret, i = 0;
 438
 439         mutex_lock(&data->lock);
 440         /*
 441          * Do a bulk read if all channels are requested,
 442          * from 0x00 (XOUT) to 0x02 (ZOUT)
 443          */
 444         if (*(indio_dev->active_scan_mask) == STK8312_ALL_CHANNEL_MASK) {
 445                 ret = i2c_smbus_read_i2c_block_data(data->client,
 446                                                     STK8312_REG_XOUT,
 447                                                     STK8312_ALL_CHANNEL_SIZE,
 448                                                     data->scan.chans);
 449                 if (ret < STK8312_ALL_CHANNEL_SIZE) {
 450                         dev_err(&data->client->dev, "register read failed\n");
 451                         mutex_unlock(&data->lock);
 452                         goto err;
 453                 }
 454         } else {
 455                 for_each_set_bit(bit, indio_dev->active_scan_mask,
 456                                  indio_dev->masklength) {
 457                         ret = stk8312_read_accel(data, bit);
 458                         if (ret < 0) {
 459                                 mutex_unlock(&data->lock);
 460                                 goto err;
 461                         }
 462                         data->scan.chans[i++] = ret;
 463                 }
 464         }
 465         mutex_unlock(&data->lock);
 466
 467         iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
 468                                            pf->timestamp);
 469 err:
 470         iio_trigger_notify_done(indio_dev->trig);
 471
 472         return IRQ_HANDLED;
 473 }
 474
 475 static irqreturn_t stk8312_data_rdy_trig_poll(int irq, void *private)
 476 {
 477         struct iio_dev *indio_dev = private;
 478         struct stk8312_data *data = iio_priv(indio_dev);
 479
 480         if (data->dready_trigger_on)
 481                 iio_trigger_poll(data->dready_trig);
 482
 483         return IRQ_HANDLED;
 484 }
 485
 486 static int stk8312_buffer_preenable(struct iio_dev *indio_dev)
 487 {
 488         struct stk8312_data *data = iio_priv(indio_dev);
 489
 490         return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
 491 }
 492
 493 static int stk8312_buffer_postdisable(struct iio_dev *indio_dev)
 494 {
 495         struct stk8312_data *data = iio_priv(indio_dev);
 496
 497         return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
 498 }
 499
 500 static const struct iio_buffer_setup_ops stk8312_buffer_setup_ops = {
 501         .preenable   = stk8312_buffer_preenable,
 502         .postenable  = iio_triggered_buffer_postenable,
 503         .predisable  = iio_triggered_buffer_predisable,
 504         .postdisable = stk8312_buffer_postdisable,
 505 };
 506
 507 static int stk8312_probe(struct i2c_client *client,
 508                          const struct i2c_device_id *id)
 509 {
 510         int ret;
 511         struct iio_dev *indio_dev;
 512         struct stk8312_data *data;
 513
 514         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 515         if (!indio_dev) {
 516                 dev_err(&client->dev, "iio allocation failed!\n");
 517                 return -ENOMEM;
 518         }
 519
 520         data = iio_priv(indio_dev);
 521         data->client = client;
 522         i2c_set_clientdata(client, indio_dev);
 523         mutex_init(&data->lock);
 524
 525         indio_dev->dev.parent = &client->dev;
 526         indio_dev->info = &stk8312_info;
 527         indio_dev->name = STK8312_DRIVER_NAME;
 528         indio_dev->modes = INDIO_DIRECT_MODE;
 529         indio_dev->channels = stk8312_channels;
 530         indio_dev->num_channels = ARRAY_SIZE(stk8312_channels);
 531
 532         /* A software reset is recommended at power-on */
 533         ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_RESET, 0x00);
 534         if (ret < 0) {
 535                 dev_err(&client->dev, "failed to reset sensor\n");
 536                 return ret;
 537         }
 538         data->sample_rate_idx = STK8312_SR_400HZ_IDX;
 539         ret = stk8312_set_range(data, STK8312_RNG_6G);
 540         if (ret < 0)
 541                 return ret;
 542
 543         ret = stk8312_set_mode(data,
 544                                STK8312_MODE_INT_AH_PP | STK8312_MODE_ACTIVE);
 545         if (ret < 0)
 546                 return ret;
 547
 548         if (client->irq > 0) {
 549                 ret = devm_request_threaded_irq(&client->dev, client->irq,
 550                                                 stk8312_data_rdy_trig_poll,
 551                                                 NULL,
 552                                                 IRQF_TRIGGER_RISING |
 553                                                 IRQF_ONESHOT,
 554                                                 STK8312_IRQ_NAME,
 555                                                 indio_dev);
 556                 if (ret < 0) {
 557                         dev_err(&client->dev, "request irq %d failed\n",
 558                                 client->irq);
 559                         goto err_power_off;
 560                 }
 561
 562                 data->dready_trig = devm_iio_trigger_alloc(&client->dev,
 563                                                            "%s-dev%d",
 564                                                            indio_dev->name,
 565                                                            indio_dev->id);
 566                 if (!data->dready_trig) {
 567                         ret = -ENOMEM;
 568                         goto err_power_off;
 569                 }
 570
 571                 data->dready_trig->dev.parent = &client->dev;
 572                 data->dready_trig->ops = &stk8312_trigger_ops;
 573                 iio_trigger_set_drvdata(data->dready_trig, indio_dev);
 574                 ret = iio_trigger_register(data->dready_trig);
 575                 if (ret) {
 576                         dev_err(&client->dev, "iio trigger register failed\n");
 577                         goto err_power_off;
 578                 }
 579         }
 580
 581         ret = iio_triggered_buffer_setup(indio_dev,
 582                                          iio_pollfunc_store_time,
 583                                          stk8312_trigger_handler,
 584                                          &stk8312_buffer_setup_ops);
 585         if (ret < 0) {
 586                 dev_err(&client->dev, "iio triggered buffer setup failed\n");
 587                 goto err_trigger_unregister;
 588         }
 589
 590         ret = iio_device_register(indio_dev);
 591         if (ret < 0) {
 592                 dev_err(&client->dev, "device_register failed\n");
 593                 goto err_buffer_cleanup;
 594         }
 595
 596         return 0;
 597
 598 err_buffer_cleanup:
 599         iio_triggered_buffer_cleanup(indio_dev);
 600 err_trigger_unregister:
 601         if (data->dready_trig)
 602                 iio_trigger_unregister(data->dready_trig);
 603 err_power_off:
 604         stk8312_set_mode(data, STK8312_MODE_STANDBY);
 605         return ret;
 606 }
 607
 608 static int stk8312_remove(struct i2c_client *client)
 609 {
 610         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 611         struct stk8312_data *data = iio_priv(indio_dev);
 612
 613         iio_device_unregister(indio_dev);
 614         iio_triggered_buffer_cleanup(indio_dev);
 615
 616         if (data->dready_trig)
 617                 iio_trigger_unregister(data->dready_trig);
 618
 619         return stk8312_set_mode(data, STK8312_MODE_STANDBY);
 620 }
 621
 622 #ifdef CONFIG_PM_SLEEP
 623 static int stk8312_suspend(struct device *dev)
 624 {
 625         struct stk8312_data *data;
 626
 627         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 628
 629         return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
 630 }
 631
 632 static int stk8312_resume(struct device *dev)
 633 {
 634         struct stk8312_data *data;
 635
 636         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 637
 638         return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
 639 }
 640
 641 static SIMPLE_DEV_PM_OPS(stk8312_pm_ops, stk8312_suspend, stk8312_resume);
 642
 643 #define STK8312_PM_OPS (&stk8312_pm_ops)
 644 #else
 645 #define STK8312_PM_OPS NULL
 646 #endif
 647
 648 static const struct i2c_device_id stk8312_i2c_id[] = {
 649         {"STK8312", 0},
 650         {}
 651 };
 652 MODULE_DEVICE_TABLE(i2c, stk8312_i2c_id);
 653
 654 static const struct acpi_device_id stk8312_acpi_id[] = {
 655         {"STK8312", 0},
 656         {}
 657 };
 658
 659 MODULE_DEVICE_TABLE(acpi, stk8312_acpi_id);
 660
 661 static struct i2c_driver stk8312_driver = {
 662         .driver = {
 663                 .name = STK8312_DRIVER_NAME,
 664                 .pm = STK8312_PM_OPS,
 665                 .acpi_match_table = ACPI_PTR(stk8312_acpi_id),
 666         },
 667         .probe =            stk8312_probe,
 668         .remove =           stk8312_remove,
 669         .id_table =         stk8312_i2c_id,
 670 };
 671
 672 module_i2c_driver(stk8312_driver);
 673
 674 MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
 675 MODULE_DESCRIPTION("STK8312 3-Axis Accelerometer driver");
 676 MODULE_LICENSE("GPL v2");