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         s8 buffer[16]; /* 3x8-bit channels + 5x8 padding + 64-bit timestamp */
 107 };
 108
 109 static IIO_CONST_ATTR(in_accel_scale_available, STK8312_SCALE_AVAIL);
 110
 111 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("3.125 6.25 12.5 25 50 100 200 400");
 112
 113 static struct attribute *stk8312_attributes[] = {
 114         &iio_const_attr_in_accel_scale_available.dev_attr.attr,
 115         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 116         NULL,
 117 };
 118
 119 static const struct attribute_group stk8312_attribute_group = {
 120         .attrs = stk8312_attributes
 121 };
 122
 123 static int stk8312_otp_init(struct stk8312_data *data)
 124 {
 125         int ret;
 126         int count = 10;
 127         struct i2c_client *client = data->client;
 128
 129         ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPADDR, 0x70);
 130         if (ret < 0)
 131                 goto exit_err;
 132         ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPCTRL, 0x02);
 133         if (ret < 0)
 134                 goto exit_err;
 135
 136         do {
 137                 usleep_range(1000, 5000);
 138                 ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPCTRL);
 139                 if (ret < 0)
 140                         goto exit_err;
 141                 count--;
 142         } while (!(ret & BIT(7)) && count > 0);
 143
 144         if (count == 0) {
 145                 ret = -ETIMEDOUT;
 146                 goto exit_err;
 147         }
 148
 149         ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPDATA);
 150         if (ret == 0)
 151                 ret = -EINVAL;
 152         if (ret < 0)
 153                 goto exit_err;
 154
 155         ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_AFECTRL, ret);
 156         if (ret < 0)
 157                 goto exit_err;
 158         msleep(150);
 159
 160         return 0;
 161
 162 exit_err:
 163         dev_err(&client->dev, "failed to initialize sensor\n");
 164         return ret;
 165 }
 166
 167 static int stk8312_set_mode(struct stk8312_data *data, u8 mode)
 168 {
 169         int ret;
 170         struct i2c_client *client = data->client;
 171
 172         if (mode == data->mode)
 173                 return 0;
 174
 175         ret = i2c_smbus_write_byte_data(client, STK8312_REG_MODE, mode);
 176         if (ret < 0) {
 177                 dev_err(&client->dev, "failed to change sensor mode\n");
 178                 return ret;
 179         }
 180
 181         data->mode = mode;
 182         if (mode & STK8312_MODE_ACTIVE) {
 183                 /* Need to run OTP sequence before entering active mode */
 184                 usleep_range(1000, 5000);
 185                 ret = stk8312_otp_init(data);
 186         }
 187
 188         return ret;
 189 }
 190
 191 static int stk8312_set_interrupts(struct stk8312_data *data, u8 int_mask)
 192 {
 193         int ret;
 194         u8 mode;
 195         struct i2c_client *client = data->client;
 196
 197         mode = data->mode;
 198         /* We need to go in standby mode to modify registers */
 199         ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
 200         if (ret < 0)
 201                 return ret;
 202
 203         ret = i2c_smbus_write_byte_data(client, STK8312_REG_INTSU, int_mask);
 204         if (ret < 0) {
 205                 dev_err(&client->dev, "failed to set interrupts\n");
 206                 stk8312_set_mode(data, mode);
 207                 return ret;
 208         }
 209
 210         return stk8312_set_mode(data, mode);
 211 }
 212
 213 static int stk8312_data_rdy_trigger_set_state(struct iio_trigger *trig,
 214                                               bool state)
 215 {
 216         struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 217         struct stk8312_data *data = iio_priv(indio_dev);
 218         int ret;
 219
 220         if (state)
 221                 ret = stk8312_set_interrupts(data, STK8312_DREADY_BIT);
 222         else
 223                 ret = stk8312_set_interrupts(data, 0x00);
 224
 225         if (ret < 0) {
 226                 dev_err(&data->client->dev, "failed to set trigger state\n");
 227                 return ret;
 228         }
 229
 230         data->dready_trigger_on = state;
 231
 232         return 0;
 233 }
 234
 235 static const struct iio_trigger_ops stk8312_trigger_ops = {
 236         .set_trigger_state = stk8312_data_rdy_trigger_set_state,
 237 };
 238
 239 static int stk8312_set_sample_rate(struct stk8312_data *data, u8 rate)
 240 {
 241         int ret;
 242         u8 masked_reg;
 243         u8 mode;
 244         struct i2c_client *client = data->client;
 245
 246         if (rate == data->sample_rate_idx)
 247                 return 0;
 248
 249         mode = data->mode;
 250         /* We need to go in standby mode to modify registers */
 251         ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
 252         if (ret < 0)
 253                 return ret;
 254
 255         ret = i2c_smbus_read_byte_data(client, STK8312_REG_SR);
 256         if (ret < 0)
 257                 goto err_activate;
 258
 259         masked_reg = (ret & (~STK8312_SR_MASK)) | rate;
 260
 261         ret = i2c_smbus_write_byte_data(client, STK8312_REG_SR, masked_reg);
 262         if (ret < 0)
 263                 goto err_activate;
 264
 265         data->sample_rate_idx = rate;
 266
 267         return stk8312_set_mode(data, mode);
 268
 269 err_activate:
 270         dev_err(&client->dev, "failed to set sampling rate\n");
 271         stk8312_set_mode(data, mode);
 272
 273         return ret;
 274 }
 275
 276 static int stk8312_set_range(struct stk8312_data *data, u8 range)
 277 {
 278         int ret;
 279         u8 masked_reg;
 280         u8 mode;
 281         struct i2c_client *client = data->client;
 282
 283         if (range != 1 && range != 2)
 284                 return -EINVAL;
 285         else if (range == data->range)
 286                 return 0;
 287
 288         mode = data->mode;
 289         /* We need to go in standby mode to modify registers */
 290         ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
 291         if (ret < 0)
 292                 return ret;
 293
 294         ret = i2c_smbus_read_byte_data(client, STK8312_REG_STH);
 295         if (ret < 0)
 296                 goto err_activate;
 297
 298         masked_reg = ret & (~STK8312_RNG_MASK);
 299         masked_reg |= range << STK8312_RNG_SHIFT;
 300
 301         ret = i2c_smbus_write_byte_data(client, STK8312_REG_STH, masked_reg);
 302         if (ret < 0)
 303                 goto err_activate;
 304
 305         data->range = range;
 306
 307         return stk8312_set_mode(data, mode);
 308
 309 err_activate:
 310         dev_err(&client->dev, "failed to change sensor range\n");
 311         stk8312_set_mode(data, mode);
 312
 313         return ret;
 314 }
 315
 316 static int stk8312_read_accel(struct stk8312_data *data, u8 address)
 317 {
 318         int ret;
 319         struct i2c_client *client = data->client;
 320
 321         if (address > 2)
 322                 return -EINVAL;
 323
 324         ret = i2c_smbus_read_byte_data(client, address);
 325         if (ret < 0)
 326                 dev_err(&client->dev, "register read failed\n");
 327
 328         return ret;
 329 }
 330
 331 static int stk8312_read_raw(struct iio_dev *indio_dev,
 332                             struct iio_chan_spec const *chan,
 333                             int *val, int *val2, long mask)
 334 {
 335         struct stk8312_data *data = iio_priv(indio_dev);
 336         int ret;
 337
 338         switch (mask) {
 339         case IIO_CHAN_INFO_RAW:
 340                 if (iio_buffer_enabled(indio_dev))
 341                         return -EBUSY;
 342                 mutex_lock(&data->lock);
 343                 ret = stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
 344                 if (ret < 0) {
 345                         mutex_unlock(&data->lock);
 346                         return ret;
 347                 }
 348                 ret = stk8312_read_accel(data, chan->address);
 349                 if (ret < 0) {
 350                         stk8312_set_mode(data,
 351                                          data->mode & (~STK8312_MODE_ACTIVE));
 352                         mutex_unlock(&data->lock);
 353                         return ret;
 354                 }
 355                 *val = sign_extend32(ret, 7);
 356                 ret = stk8312_set_mode(data,
 357                                        data->mode & (~STK8312_MODE_ACTIVE));
 358                 mutex_unlock(&data->lock);
 359                 if (ret < 0)
 360                         return ret;
 361                 return IIO_VAL_INT;
 362         case IIO_CHAN_INFO_SCALE:
 363                 *val = stk8312_scale_table[data->range - 1][0];
 364                 *val2 = stk8312_scale_table[data->range - 1][1];
 365                 return IIO_VAL_INT_PLUS_MICRO;
 366         case IIO_CHAN_INFO_SAMP_FREQ:
 367                 *val = stk8312_samp_freq_table[data->sample_rate_idx].val;
 368                 *val2 = stk8312_samp_freq_table[data->sample_rate_idx].val2;
 369                 return IIO_VAL_INT_PLUS_MICRO;
 370         }
 371
 372         return -EINVAL;
 373 }
 374
 375 static int stk8312_write_raw(struct iio_dev *indio_dev,
 376                              struct iio_chan_spec const *chan,
 377                              int val, int val2, long mask)
 378 {
 379         int i;
 380         int index = -1;
 381         int ret;
 382         struct stk8312_data *data = iio_priv(indio_dev);
 383
 384         switch (mask) {
 385         case IIO_CHAN_INFO_SCALE:
 386                 for (i = 0; i < ARRAY_SIZE(stk8312_scale_table); i++)
 387                         if (val == stk8312_scale_table[i][0] &&
 388                             val2 == stk8312_scale_table[i][1]) {
 389                                 index = i + 1;
 390                                 break;
 391                         }
 392                 if (index < 0)
 393                         return -EINVAL;
 394
 395                 mutex_lock(&data->lock);
 396                 ret = stk8312_set_range(data, index);
 397                 mutex_unlock(&data->lock);
 398
 399                 return ret;
 400         case IIO_CHAN_INFO_SAMP_FREQ:
 401                 for (i = 0; i < ARRAY_SIZE(stk8312_samp_freq_table); i++)
 402                         if (val == stk8312_samp_freq_table[i].val &&
 403                             val2 == stk8312_samp_freq_table[i].val2) {
 404                                 index = i;
 405                                 break;
 406                         }
 407                 if (index < 0)
 408                         return -EINVAL;
 409                 mutex_lock(&data->lock);
 410                 ret = stk8312_set_sample_rate(data, index);
 411                 mutex_unlock(&data->lock);
 412
 413                 return ret;
 414         }
 415
 416         return -EINVAL;
 417 }
 418
 419 static const struct iio_info stk8312_info = {
 420         .read_raw               = stk8312_read_raw,
 421         .write_raw              = stk8312_write_raw,
 422         .attrs                  = &stk8312_attribute_group,
 423 };
 424
 425 static irqreturn_t stk8312_trigger_handler(int irq, void *p)
 426 {
 427         struct iio_poll_func *pf = p;
 428         struct iio_dev *indio_dev = pf->indio_dev;
 429         struct stk8312_data *data = iio_priv(indio_dev);
 430         int bit, ret, i = 0;
 431
 432         mutex_lock(&data->lock);
 433         /*
 434          * Do a bulk read if all channels are requested,
 435          * from 0x00 (XOUT) to 0x02 (ZOUT)
 436          */
 437         if (*(indio_dev->active_scan_mask) == STK8312_ALL_CHANNEL_MASK) {
 438                 ret = i2c_smbus_read_i2c_block_data(data->client,
 439                                                     STK8312_REG_XOUT,
 440                                                     STK8312_ALL_CHANNEL_SIZE,
 441                                                     data->buffer);
 442                 if (ret < STK8312_ALL_CHANNEL_SIZE) {
 443                         dev_err(&data->client->dev, "register read failed\n");
 444                         mutex_unlock(&data->lock);
 445                         goto err;
 446                 }
 447         } else {
 448                 for_each_set_bit(bit, indio_dev->active_scan_mask,
 449                                  indio_dev->masklength) {
 450                         ret = stk8312_read_accel(data, bit);
 451                         if (ret < 0) {
 452                                 mutex_unlock(&data->lock);
 453                                 goto err;
 454                         }
 455                         data->buffer[i++] = ret;
 456                 }
 457         }
 458         mutex_unlock(&data->lock);
 459
 460         iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
 461                                            pf->timestamp);
 462 err:
 463         iio_trigger_notify_done(indio_dev->trig);
 464
 465         return IRQ_HANDLED;
 466 }
 467
 468 static irqreturn_t stk8312_data_rdy_trig_poll(int irq, void *private)
 469 {
 470         struct iio_dev *indio_dev = private;
 471         struct stk8312_data *data = iio_priv(indio_dev);
 472
 473         if (data->dready_trigger_on)
 474                 iio_trigger_poll(data->dready_trig);
 475
 476         return IRQ_HANDLED;
 477 }
 478
 479 static int stk8312_buffer_preenable(struct iio_dev *indio_dev)
 480 {
 481         struct stk8312_data *data = iio_priv(indio_dev);
 482
 483         return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
 484 }
 485
 486 static int stk8312_buffer_postdisable(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 const struct iio_buffer_setup_ops stk8312_buffer_setup_ops = {
 494         .preenable   = stk8312_buffer_preenable,
 495         .postenable  = iio_triggered_buffer_postenable,
 496         .predisable  = iio_triggered_buffer_predisable,
 497         .postdisable = stk8312_buffer_postdisable,
 498 };
 499
 500 static int stk8312_probe(struct i2c_client *client,
 501                          const struct i2c_device_id *id)
 502 {
 503         int ret;
 504         struct iio_dev *indio_dev;
 505         struct stk8312_data *data;
 506
 507         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 508         if (!indio_dev) {
 509                 dev_err(&client->dev, "iio allocation failed!\n");
 510                 return -ENOMEM;
 511         }
 512
 513         data = iio_priv(indio_dev);
 514         data->client = client;
 515         i2c_set_clientdata(client, indio_dev);
 516         mutex_init(&data->lock);
 517
 518         indio_dev->dev.parent = &client->dev;
 519         indio_dev->info = &stk8312_info;
 520         indio_dev->name = STK8312_DRIVER_NAME;
 521         indio_dev->modes = INDIO_DIRECT_MODE;
 522         indio_dev->channels = stk8312_channels;
 523         indio_dev->num_channels = ARRAY_SIZE(stk8312_channels);
 524
 525         /* A software reset is recommended at power-on */
 526         ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_RESET, 0x00);
 527         if (ret < 0) {
 528                 dev_err(&client->dev, "failed to reset sensor\n");
 529                 return ret;
 530         }
 531         data->sample_rate_idx = STK8312_SR_400HZ_IDX;
 532         ret = stk8312_set_range(data, STK8312_RNG_6G);
 533         if (ret < 0)
 534                 return ret;
 535
 536         ret = stk8312_set_mode(data,
 537                                STK8312_MODE_INT_AH_PP | STK8312_MODE_ACTIVE);
 538         if (ret < 0)
 539                 return ret;
 540
 541         if (client->irq > 0) {
 542                 ret = devm_request_threaded_irq(&client->dev, client->irq,
 543                                                 stk8312_data_rdy_trig_poll,
 544                                                 NULL,
 545                                                 IRQF_TRIGGER_RISING |
 546                                                 IRQF_ONESHOT,
 547                                                 STK8312_IRQ_NAME,
 548                                                 indio_dev);
 549                 if (ret < 0) {
 550                         dev_err(&client->dev, "request irq %d failed\n",
 551                                 client->irq);
 552                         goto err_power_off;
 553                 }
 554
 555                 data->dready_trig = devm_iio_trigger_alloc(&client->dev,
 556                                                            "%s-dev%d",
 557                                                            indio_dev->name,
 558                                                            indio_dev->id);
 559                 if (!data->dready_trig) {
 560                         ret = -ENOMEM;
 561                         goto err_power_off;
 562                 }
 563
 564                 data->dready_trig->dev.parent = &client->dev;
 565                 data->dready_trig->ops = &stk8312_trigger_ops;
 566                 iio_trigger_set_drvdata(data->dready_trig, indio_dev);
 567                 ret = iio_trigger_register(data->dready_trig);
 568                 if (ret) {
 569                         dev_err(&client->dev, "iio trigger register failed\n");
 570                         goto err_power_off;
 571                 }
 572         }
 573
 574         ret = iio_triggered_buffer_setup(indio_dev,
 575                                          iio_pollfunc_store_time,
 576                                          stk8312_trigger_handler,
 577                                          &stk8312_buffer_setup_ops);
 578         if (ret < 0) {
 579                 dev_err(&client->dev, "iio triggered buffer setup failed\n");
 580                 goto err_trigger_unregister;
 581         }
 582
 583         ret = iio_device_register(indio_dev);
 584         if (ret < 0) {
 585                 dev_err(&client->dev, "device_register failed\n");
 586                 goto err_buffer_cleanup;
 587         }
 588
 589         return 0;
 590
 591 err_buffer_cleanup:
 592         iio_triggered_buffer_cleanup(indio_dev);
 593 err_trigger_unregister:
 594         if (data->dready_trig)
 595                 iio_trigger_unregister(data->dready_trig);
 596 err_power_off:
 597         stk8312_set_mode(data, STK8312_MODE_STANDBY);
 598         return ret;
 599 }
 600
 601 static int stk8312_remove(struct i2c_client *client)
 602 {
 603         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 604         struct stk8312_data *data = iio_priv(indio_dev);
 605
 606         iio_device_unregister(indio_dev);
 607         iio_triggered_buffer_cleanup(indio_dev);
 608
 609         if (data->dready_trig)
 610                 iio_trigger_unregister(data->dready_trig);
 611
 612         return stk8312_set_mode(data, STK8312_MODE_STANDBY);
 613 }
 614
 615 #ifdef CONFIG_PM_SLEEP
 616 static int stk8312_suspend(struct device *dev)
 617 {
 618         struct stk8312_data *data;
 619
 620         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 621
 622         return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
 623 }
 624
 625 static int stk8312_resume(struct device *dev)
 626 {
 627         struct stk8312_data *data;
 628
 629         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 630
 631         return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
 632 }
 633
 634 static SIMPLE_DEV_PM_OPS(stk8312_pm_ops, stk8312_suspend, stk8312_resume);
 635
 636 #define STK8312_PM_OPS (&stk8312_pm_ops)
 637 #else
 638 #define STK8312_PM_OPS NULL
 639 #endif
 640
 641 static const struct i2c_device_id stk8312_i2c_id[] = {
 642         {"STK8312", 0},
 643         {}
 644 };
 645 MODULE_DEVICE_TABLE(i2c, stk8312_i2c_id);
 646
 647 static const struct acpi_device_id stk8312_acpi_id[] = {
 648         {"STK8312", 0},
 649         {}
 650 };
 651
 652 MODULE_DEVICE_TABLE(acpi, stk8312_acpi_id);
 653
 654 static struct i2c_driver stk8312_driver = {
 655         .driver = {
 656                 .name = STK8312_DRIVER_NAME,
 657                 .pm = STK8312_PM_OPS,
 658                 .acpi_match_table = ACPI_PTR(stk8312_acpi_id),
 659         },
 660         .probe =            stk8312_probe,
 661         .remove =           stk8312_remove,
 662         .id_table =         stk8312_i2c_id,
 663 };
 664
 665 module_i2c_driver(stk8312_driver);
 666
 667 MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
 668 MODULE_DESCRIPTION("STK8312 3-Axis Accelerometer driver");
 669 MODULE_LICENSE("GPL v2");