drivers/iio/accel/stk8312.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /**
   3  * Sensortek STK8312 3-Axis Accelerometer
   4  *
   5  * Copyright (c) 2015, Intel Corporation.
   6  *
   7  * IIO driver for STK8312; 7-bit I2C address: 0x3D.
   8  */
   9
  10 #include <linux/acpi.h>
  11 #include <linux/i2c.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/delay.h>
  16 #include <linux/iio/buffer.h>
  17 #include <linux/iio/iio.h>
  18 #include <linux/iio/sysfs.h>
  19 #include <linux/iio/trigger.h>
  20 #include <linux/iio/triggered_buffer.h>
  21 #include <linux/iio/trigger_consumer.h>
  22
  23 #define STK8312_REG_XOUT                0x00
  24 #define STK8312_REG_YOUT                0x01
  25 #define STK8312_REG_ZOUT                0x02
  26 #define STK8312_REG_INTSU               0x06
  27 #define STK8312_REG_MODE                0x07
  28 #define STK8312_REG_SR                  0x08
  29 #define STK8312_REG_STH                 0x13
  30 #define STK8312_REG_RESET               0x20
  31 #define STK8312_REG_AFECTRL             0x24
  32 #define STK8312_REG_OTPADDR             0x3D
  33 #define STK8312_REG_OTPDATA             0x3E
  34 #define STK8312_REG_OTPCTRL             0x3F
  35
  36 #define STK8312_MODE_ACTIVE             BIT(0)
  37 #define STK8312_MODE_STANDBY            0x00
  38 #define STK8312_MODE_INT_AH_PP          0xC0    /* active-high, push-pull */
  39 #define STK8312_DREADY_BIT              BIT(4)
  40 #define STK8312_RNG_6G                  1
  41 #define STK8312_RNG_SHIFT               6
  42 #define STK8312_RNG_MASK                GENMASK(7, 6)
  43 #define STK8312_SR_MASK                 GENMASK(2, 0)
  44 #define STK8312_SR_400HZ_IDX            0
  45 #define STK8312_ALL_CHANNEL_MASK        GENMASK(2, 0)
  46 #define STK8312_ALL_CHANNEL_SIZE        3
  47
  48 #define STK8312_DRIVER_NAME             "stk8312"
  49 #define STK8312_IRQ_NAME                "stk8312_event"
  50
  51 /*
  52  * The accelerometer has two measurement ranges:
  53  *
  54  * -6g - +6g (8-bit, signed)
  55  * -16g - +16g (8-bit, signed)
  56  *
  57  * scale1 = (6 + 6) * 9.81 / (2^8 - 1)     = 0.4616
  58  * scale2 = (16 + 16) * 9.81 / (2^8 - 1)   = 1.2311
  59  */
  60 #define STK8312_SCALE_AVAIL             "0.4616 1.2311"
  61
  62 static const int stk8312_scale_table[][2] = {
  63         {0, 461600}, {1, 231100}
  64 };
  65
  66 static const struct {
  67         int val;
  68         int val2;
  69 } stk8312_samp_freq_table[] = {
  70         {400, 0}, {200, 0}, {100, 0}, {50, 0}, {25, 0},
  71         {12, 500000}, {6, 250000}, {3, 125000}
  72 };
  73
  74 #define STK8312_ACCEL_CHANNEL(index, reg, axis) {                       \
  75         .type = IIO_ACCEL,                                              \
  76         .address = reg,                                                 \
  77         .modified = 1,                                                  \
  78         .channel2 = IIO_MOD_##axis,                                     \
  79         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),                   \
  80         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |          \
  81                                     BIT(IIO_CHAN_INFO_SAMP_FREQ),       \
  82         .scan_index = index,                                            \
  83         .scan_type = {                                                  \
  84                 .sign = 's',                                            \
  85                 .realbits = 8,                                          \
  86                 .storagebits = 8,                                       \
  87                 .endianness = IIO_CPU,                                  \
  88         },                                                              \
  89 }
  90
  91 static const struct iio_chan_spec stk8312_channels[] = {
  92         STK8312_ACCEL_CHANNEL(0, STK8312_REG_XOUT, X),
  93         STK8312_ACCEL_CHANNEL(1, STK8312_REG_YOUT, Y),
  94         STK8312_ACCEL_CHANNEL(2, STK8312_REG_ZOUT, Z),
  95         IIO_CHAN_SOFT_TIMESTAMP(3),
  96 };
  97
  98 struct stk8312_data {
  99         struct i2c_client *client;
 100         struct mutex lock;
 101         u8 range;
 102         u8 sample_rate_idx;
 103         u8 mode;
 104         struct iio_trigger *dready_trig;
 105         bool dready_trigger_on;
 106         /* Ensure timestamp is naturally aligned */
 107         struct {
 108                 s8 chans[3];
 109                 s64 timestamp __aligned(8);
 110         } scan;
 111 };
 112
 113 static IIO_CONST_ATTR(in_accel_scale_available, STK8312_SCALE_AVAIL);
 114
 115 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("3.125 6.25 12.5 25 50 100 200 400");
 116
 117 static struct attribute *stk8312_attributes[] = {
 118         &iio_const_attr_in_accel_scale_available.dev_attr.attr,
 119         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 120         NULL,
 121 };
 122
 123 static const struct attribute_group stk8312_attribute_group = {
 124         .attrs = stk8312_attributes
 125 };
 126
 127 static int stk8312_otp_init(struct stk8312_data *data)
 128 {
 129         int ret;
 130         int count = 10;
 131         struct i2c_client *client = data->client;
 132
 133         ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPADDR, 0x70);
 134         if (ret < 0)
 135                 goto exit_err;
 136         ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPCTRL, 0x02);
 137         if (ret < 0)
 138                 goto exit_err;
 139
 140         do {
 141                 usleep_range(1000, 5000);
 142                 ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPCTRL);
 143                 if (ret < 0)
 144                         goto exit_err;
 145                 count--;
 146         } while (!(ret & BIT(7)) && count > 0);
 147
 148         if (count == 0) {
 149                 ret = -ETIMEDOUT;
 150                 goto exit_err;
 151         }
 152
 153         ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPDATA);
 154         if (ret == 0)
 155                 ret = -EINVAL;
 156         if (ret < 0)
 157                 goto exit_err;
 158
 159         ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_AFECTRL, ret);
 160         if (ret < 0)
 161                 goto exit_err;
 162         msleep(150);
 163
 164         return 0;
 165
 166 exit_err:
 167         dev_err(&client->dev, "failed to initialize sensor\n");
 168         return ret;
 169 }
 170
 171 static int stk8312_set_mode(struct stk8312_data *data, u8 mode)
 172 {
 173         int ret;
 174         struct i2c_client *client = data->client;
 175
 176         if (mode == data->mode)
 177                 return 0;
 178
 179         ret = i2c_smbus_write_byte_data(client, STK8312_REG_MODE, mode);
 180         if (ret < 0) {
 181                 dev_err(&client->dev, "failed to change sensor mode\n");
 182                 return ret;
 183         }
 184
 185         data->mode = mode;
 186         if (mode & STK8312_MODE_ACTIVE) {
 187                 /* Need to run OTP sequence before entering active mode */
 188                 usleep_range(1000, 5000);
 189                 ret = stk8312_otp_init(data);
 190         }
 191
 192         return ret;
 193 }
 194
 195 static int stk8312_set_interrupts(struct stk8312_data *data, u8 int_mask)
 196 {
 197         int ret;
 198         u8 mode;
 199         struct i2c_client *client = data->client;
 200
 201         mode = data->mode;
 202         /* We need to go in standby mode to modify registers */
 203         ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
 204         if (ret < 0)
 205                 return ret;
 206
 207         ret = i2c_smbus_write_byte_data(client, STK8312_REG_INTSU, int_mask);
 208         if (ret < 0) {
 209                 dev_err(&client->dev, "failed to set interrupts\n");
 210                 stk8312_set_mode(data, mode);
 211                 return ret;
 212         }
 213
 214         return stk8312_set_mode(data, mode);
 215 }
 216
 217 static int stk8312_data_rdy_trigger_set_state(struct iio_trigger *trig,
 218                                               bool state)
 219 {
 220         struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 221         struct stk8312_data *data = iio_priv(indio_dev);
 222         int ret;
 223
 224         if (state)
 225                 ret = stk8312_set_interrupts(data, STK8312_DREADY_BIT);
 226         else
 227                 ret = stk8312_set_interrupts(data, 0x00);
 228
 229         if (ret < 0) {
 230                 dev_err(&data->client->dev, "failed to set trigger state\n");
 231                 return ret;
 232         }
 233
 234         data->dready_trigger_on = state;
 235
 236         return 0;
 237 }
 238
 239 static const struct iio_trigger_ops stk8312_trigger_ops = {
 240         .set_trigger_state = stk8312_data_rdy_trigger_set_state,
 241 };
 242
 243 static int stk8312_set_sample_rate(struct stk8312_data *data, u8 rate)
 244 {
 245         int ret;
 246         u8 masked_reg;
 247         u8 mode;
 248         struct i2c_client *client = data->client;
 249
 250         if (rate == data->sample_rate_idx)
 251                 return 0;
 252
 253         mode = data->mode;
 254         /* We need to go in standby mode to modify registers */
 255         ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
 256         if (ret < 0)
 257                 return ret;
 258
 259         ret = i2c_smbus_read_byte_data(client, STK8312_REG_SR);
 260         if (ret < 0)
 261                 goto err_activate;
 262
 263         masked_reg = (ret & (~STK8312_SR_MASK)) | rate;
 264
 265         ret = i2c_smbus_write_byte_data(client, STK8312_REG_SR, masked_reg);
 266         if (ret < 0)
 267                 goto err_activate;
 268
 269         data->sample_rate_idx = rate;
 270
 271         return stk8312_set_mode(data, mode);
 272
 273 err_activate:
 274         dev_err(&client->dev, "failed to set sampling rate\n");
 275         stk8312_set_mode(data, mode);
 276
 277         return ret;
 278 }
 279
 280 static int stk8312_set_range(struct stk8312_data *data, u8 range)
 281 {
 282         int ret;
 283         u8 masked_reg;
 284         u8 mode;
 285         struct i2c_client *client = data->client;
 286
 287         if (range != 1 && range != 2)
 288                 return -EINVAL;
 289         else if (range == data->range)
 290                 return 0;
 291
 292         mode = data->mode;
 293         /* We need to go in standby mode to modify registers */
 294         ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
 295         if (ret < 0)
 296                 return ret;
 297
 298         ret = i2c_smbus_read_byte_data(client, STK8312_REG_STH);
 299         if (ret < 0)
 300                 goto err_activate;
 301
 302         masked_reg = ret & (~STK8312_RNG_MASK);
 303         masked_reg |= range << STK8312_RNG_SHIFT;
 304
 305         ret = i2c_smbus_write_byte_data(client, STK8312_REG_STH, masked_reg);
 306         if (ret < 0)
 307                 goto err_activate;
 308
 309         data->range = range;
 310
 311         return stk8312_set_mode(data, mode);
 312
 313 err_activate:
 314         dev_err(&client->dev, "failed to change sensor range\n");
 315         stk8312_set_mode(data, mode);
 316
 317         return ret;
 318 }
 319
 320 static int stk8312_read_accel(struct stk8312_data *data, u8 address)
 321 {
 322         int ret;
 323         struct i2c_client *client = data->client;
 324
 325         if (address > 2)
 326                 return -EINVAL;
 327
 328         ret = i2c_smbus_read_byte_data(client, address);
 329         if (ret < 0)
 330                 dev_err(&client->dev, "register read failed\n");
 331
 332         return ret;
 333 }
 334
 335 static int stk8312_read_raw(struct iio_dev *indio_dev,
 336                             struct iio_chan_spec const *chan,
 337                             int *val, int *val2, long mask)
 338 {
 339         struct stk8312_data *data = iio_priv(indio_dev);
 340         int ret;
 341
 342         switch (mask) {
 343         case IIO_CHAN_INFO_RAW:
 344                 if (iio_buffer_enabled(indio_dev))
 345                         return -EBUSY;
 346                 mutex_lock(&data->lock);
 347                 ret = stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
 348                 if (ret < 0) {
 349                         mutex_unlock(&data->lock);
 350                         return ret;
 351                 }
 352                 ret = stk8312_read_accel(data, chan->address);
 353                 if (ret < 0) {
 354                         stk8312_set_mode(data,
 355                                          data->mode & (~STK8312_MODE_ACTIVE));
 356                         mutex_unlock(&data->lock);
 357                         return ret;
 358                 }
 359                 *val = sign_extend32(ret, 7);
 360                 ret = stk8312_set_mode(data,
 361                                        data->mode & (~STK8312_MODE_ACTIVE));
 362                 mutex_unlock(&data->lock);
 363                 if (ret < 0)
 364                         return ret;
 365                 return IIO_VAL_INT;
 366         case IIO_CHAN_INFO_SCALE:
 367                 *val = stk8312_scale_table[data->range - 1][0];
 368                 *val2 = stk8312_scale_table[data->range - 1][1];
 369                 return IIO_VAL_INT_PLUS_MICRO;
 370         case IIO_CHAN_INFO_SAMP_FREQ:
 371                 *val = stk8312_samp_freq_table[data->sample_rate_idx].val;
 372                 *val2 = stk8312_samp_freq_table[data->sample_rate_idx].val2;
 373                 return IIO_VAL_INT_PLUS_MICRO;
 374         }
 375
 376         return -EINVAL;
 377 }
 378
 379 static int stk8312_write_raw(struct iio_dev *indio_dev,
 380                              struct iio_chan_spec const *chan,
 381                              int val, int val2, long mask)
 382 {
 383         int i;
 384         int index = -1;
 385         int ret;
 386         struct stk8312_data *data = iio_priv(indio_dev);
 387
 388         switch (mask) {
 389         case IIO_CHAN_INFO_SCALE:
 390                 for (i = 0; i < ARRAY_SIZE(stk8312_scale_table); i++)
 391                         if (val == stk8312_scale_table[i][0] &&
 392                             val2 == stk8312_scale_table[i][1]) {
 393                                 index = i + 1;
 394                                 break;
 395                         }
 396                 if (index < 0)
 397                         return -EINVAL;
 398
 399                 mutex_lock(&data->lock);
 400                 ret = stk8312_set_range(data, index);
 401                 mutex_unlock(&data->lock);
 402
 403                 return ret;
 404         case IIO_CHAN_INFO_SAMP_FREQ:
 405                 for (i = 0; i < ARRAY_SIZE(stk8312_samp_freq_table); i++)
 406                         if (val == stk8312_samp_freq_table[i].val &&
 407                             val2 == stk8312_samp_freq_table[i].val2) {
 408                                 index = i;
 409                                 break;
 410                         }
 411                 if (index < 0)
 412                         return -EINVAL;
 413                 mutex_lock(&data->lock);
 414                 ret = stk8312_set_sample_rate(data, index);
 415                 mutex_unlock(&data->lock);
 416
 417                 return ret;
 418         }
 419
 420         return -EINVAL;
 421 }
 422
 423 static const struct iio_info stk8312_info = {
 424         .read_raw               = stk8312_read_raw,
 425         .write_raw              = stk8312_write_raw,
 426         .attrs                  = &stk8312_attribute_group,
 427 };
 428
 429 static irqreturn_t stk8312_trigger_handler(int irq, void *p)
 430 {
 431         struct iio_poll_func *pf = p;
 432         struct iio_dev *indio_dev = pf->indio_dev;
 433         struct stk8312_data *data = iio_priv(indio_dev);
 434         int bit, ret, i = 0;
 435
 436         mutex_lock(&data->lock);
 437         /*
 438          * Do a bulk read if all channels are requested,
 439          * from 0x00 (XOUT) to 0x02 (ZOUT)
 440          */
 441         if (*(indio_dev->active_scan_mask) == STK8312_ALL_CHANNEL_MASK) {
 442                 ret = i2c_smbus_read_i2c_block_data(data->client,
 443                                                     STK8312_REG_XOUT,
 444                                                     STK8312_ALL_CHANNEL_SIZE,
 445                                                     data->scan.chans);
 446                 if (ret < STK8312_ALL_CHANNEL_SIZE) {
 447                         dev_err(&data->client->dev, "register read failed\n");
 448                         mutex_unlock(&data->lock);
 449                         goto err;
 450                 }
 451         } else {
 452                 for_each_set_bit(bit, indio_dev->active_scan_mask,
 453                                  indio_dev->masklength) {
 454                         ret = stk8312_read_accel(data, bit);
 455                         if (ret < 0) {
 456                                 mutex_unlock(&data->lock);
 457                                 goto err;
 458                         }
 459                         data->scan.chans[i++] = ret;
 460                 }
 461         }
 462         mutex_unlock(&data->lock);
 463
 464         iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
 465                                            pf->timestamp);
 466 err:
 467         iio_trigger_notify_done(indio_dev->trig);
 468
 469         return IRQ_HANDLED;
 470 }
 471
 472 static irqreturn_t stk8312_data_rdy_trig_poll(int irq, void *private)
 473 {
 474         struct iio_dev *indio_dev = private;
 475         struct stk8312_data *data = iio_priv(indio_dev);
 476
 477         if (data->dready_trigger_on)
 478                 iio_trigger_poll(data->dready_trig);
 479
 480         return IRQ_HANDLED;
 481 }
 482
 483 static int stk8312_buffer_preenable(struct iio_dev *indio_dev)
 484 {
 485         struct stk8312_data *data = iio_priv(indio_dev);
 486
 487         return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
 488 }
 489
 490 static int stk8312_buffer_postdisable(struct iio_dev *indio_dev)
 491 {
 492         struct stk8312_data *data = iio_priv(indio_dev);
 493
 494         return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
 495 }
 496
 497 static const struct iio_buffer_setup_ops stk8312_buffer_setup_ops = {
 498         .preenable   = stk8312_buffer_preenable,
 499         .postdisable = stk8312_buffer_postdisable,
 500 };
 501
 502 static int stk8312_probe(struct i2c_client *client,
 503                          const struct i2c_device_id *id)
 504 {
 505         int ret;
 506         struct iio_dev *indio_dev;
 507         struct stk8312_data *data;
 508
 509         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 510         if (!indio_dev) {
 511                 dev_err(&client->dev, "iio allocation failed!\n");
 512                 return -ENOMEM;
 513         }
 514
 515         data = iio_priv(indio_dev);
 516         data->client = client;
 517         i2c_set_clientdata(client, indio_dev);
 518         mutex_init(&data->lock);
 519
 520         indio_dev->info = &stk8312_info;
 521         indio_dev->name = STK8312_DRIVER_NAME;
 522         indio_dev->modes = INDIO_DIRECT_MODE;
 523         indio_dev->channels = stk8312_channels;
 524         indio_dev->num_channels = ARRAY_SIZE(stk8312_channels);
 525
 526         /* A software reset is recommended at power-on */
 527         ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_RESET, 0x00);
 528         if (ret < 0) {
 529                 dev_err(&client->dev, "failed to reset sensor\n");
 530                 return ret;
 531         }
 532         data->sample_rate_idx = STK8312_SR_400HZ_IDX;
 533         ret = stk8312_set_range(data, STK8312_RNG_6G);
 534         if (ret < 0)
 535                 return ret;
 536
 537         ret = stk8312_set_mode(data,
 538                                STK8312_MODE_INT_AH_PP | STK8312_MODE_ACTIVE);
 539         if (ret < 0)
 540                 return ret;
 541
 542         if (client->irq > 0) {
 543                 ret = devm_request_threaded_irq(&client->dev, client->irq,
 544                                                 stk8312_data_rdy_trig_poll,
 545                                                 NULL,
 546                                                 IRQF_TRIGGER_RISING |
 547                                                 IRQF_ONESHOT,
 548                                                 STK8312_IRQ_NAME,
 549                                                 indio_dev);
 550                 if (ret < 0) {
 551                         dev_err(&client->dev, "request irq %d failed\n",
 552                                 client->irq);
 553                         goto err_power_off;
 554                 }
 555
 556                 data->dready_trig = devm_iio_trigger_alloc(&client->dev,
 557                                                            "%s-dev%d",
 558                                                            indio_dev->name,
 559                                                            indio_dev->id);
 560                 if (!data->dready_trig) {
 561                         ret = -ENOMEM;
 562                         goto err_power_off;
 563                 }
 564
 565                 data->dready_trig->dev.parent = &client->dev;
 566                 data->dready_trig->ops = &stk8312_trigger_ops;
 567                 iio_trigger_set_drvdata(data->dready_trig, indio_dev);
 568                 ret = iio_trigger_register(data->dready_trig);
 569                 if (ret) {
 570                         dev_err(&client->dev, "iio trigger register failed\n");
 571                         goto err_power_off;
 572                 }
 573         }
 574
 575         ret = iio_triggered_buffer_setup(indio_dev,
 576                                          iio_pollfunc_store_time,
 577                                          stk8312_trigger_handler,
 578                                          &stk8312_buffer_setup_ops);
 579         if (ret < 0) {
 580                 dev_err(&client->dev, "iio triggered buffer setup failed\n");
 581                 goto err_trigger_unregister;
 582         }
 583
 584         ret = iio_device_register(indio_dev);
 585         if (ret < 0) {
 586                 dev_err(&client->dev, "device_register failed\n");
 587                 goto err_buffer_cleanup;
 588         }
 589
 590         return 0;
 591
 592 err_buffer_cleanup:
 593         iio_triggered_buffer_cleanup(indio_dev);
 594 err_trigger_unregister:
 595         if (data->dready_trig)
 596                 iio_trigger_unregister(data->dready_trig);
 597 err_power_off:
 598         stk8312_set_mode(data, STK8312_MODE_STANDBY);
 599         return ret;
 600 }
 601
 602 static int stk8312_remove(struct i2c_client *client)
 603 {
 604         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 605         struct stk8312_data *data = iio_priv(indio_dev);
 606
 607         iio_device_unregister(indio_dev);
 608         iio_triggered_buffer_cleanup(indio_dev);
 609
 610         if (data->dready_trig)
 611                 iio_trigger_unregister(data->dready_trig);
 612
 613         return stk8312_set_mode(data, STK8312_MODE_STANDBY);
 614 }
 615
 616 #ifdef CONFIG_PM_SLEEP
 617 static int stk8312_suspend(struct device *dev)
 618 {
 619         struct stk8312_data *data;
 620
 621         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 622
 623         return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
 624 }
 625
 626 static int stk8312_resume(struct device *dev)
 627 {
 628         struct stk8312_data *data;
 629
 630         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 631
 632         return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
 633 }
 634
 635 static SIMPLE_DEV_PM_OPS(stk8312_pm_ops, stk8312_suspend, stk8312_resume);
 636
 637 #define STK8312_PM_OPS (&stk8312_pm_ops)
 638 #else
 639 #define STK8312_PM_OPS NULL
 640 #endif
 641
 642 static const struct i2c_device_id stk8312_i2c_id[] = {
 643         {"STK8312", 0},
 644         {}
 645 };
 646 MODULE_DEVICE_TABLE(i2c, stk8312_i2c_id);
 647
 648 static const struct acpi_device_id stk8312_acpi_id[] = {
 649         {"STK8312", 0},
 650         {}
 651 };
 652
 653 MODULE_DEVICE_TABLE(acpi, stk8312_acpi_id);
 654
 655 static struct i2c_driver stk8312_driver = {
 656         .driver = {
 657                 .name = STK8312_DRIVER_NAME,
 658                 .pm = STK8312_PM_OPS,
 659                 .acpi_match_table = ACPI_PTR(stk8312_acpi_id),
 660         },
 661         .probe =            stk8312_probe,
 662         .remove =           stk8312_remove,
 663         .id_table =         stk8312_i2c_id,
 664 };
 665
 666 module_i2c_driver(stk8312_driver);
 667
 668 MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
 669 MODULE_DESCRIPTION("STK8312 3-Axis Accelerometer driver");
 670 MODULE_LICENSE("GPL v2");