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         s8 buffer[16]; /* 3x8-bit channels + 5x8 padding + 64-bit timestamp */
 110 };
 111
 112 static IIO_CONST_ATTR(in_accel_scale_available, STK8312_SCALE_AVAIL);
 113
 114 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("3.125 6.25 12.5 25 50 100 200 400");
 115
 116 static struct attribute *stk8312_attributes[] = {
 117         &iio_const_attr_in_accel_scale_available.dev_attr.attr,
 118         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 119         NULL,
 120 };
 121
 122 static const struct attribute_group stk8312_attribute_group = {
 123         .attrs = stk8312_attributes
 124 };
 125
 126 static int stk8312_otp_init(struct stk8312_data *data)
 127 {
 128         int ret;
 129         int count = 10;
 130         struct i2c_client *client = data->client;
 131
 132         ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPADDR, 0x70);
 133         if (ret < 0)
 134                 goto exit_err;
 135         ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPCTRL, 0x02);
 136         if (ret < 0)
 137                 goto exit_err;
 138
 139         do {
 140                 usleep_range(1000, 5000);
 141                 ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPCTRL);
 142                 if (ret < 0)
 143                         goto exit_err;
 144                 count--;
 145         } while (!(ret & BIT(7)) && count > 0);
 146
 147         if (count == 0) {
 148                 ret = -ETIMEDOUT;
 149                 goto exit_err;
 150         }
 151
 152         ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPDATA);
 153         if (ret == 0)
 154                 ret = -EINVAL;
 155         if (ret < 0)
 156                 goto exit_err;
 157
 158         ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_AFECTRL, ret);
 159         if (ret < 0)
 160                 goto exit_err;
 161         msleep(150);
 162
 163         return 0;
 164
 165 exit_err:
 166         dev_err(&client->dev, "failed to initialize sensor\n");
 167         return ret;
 168 }
 169
 170 static int stk8312_set_mode(struct stk8312_data *data, u8 mode)
 171 {
 172         int ret;
 173         struct i2c_client *client = data->client;
 174
 175         if (mode == data->mode)
 176                 return 0;
 177
 178         ret = i2c_smbus_write_byte_data(client, STK8312_REG_MODE, mode);
 179         if (ret < 0) {
 180                 dev_err(&client->dev, "failed to change sensor mode\n");
 181                 return ret;
 182         }
 183
 184         data->mode = mode;
 185         if (mode & STK8312_MODE_ACTIVE) {
 186                 /* Need to run OTP sequence before entering active mode */
 187                 usleep_range(1000, 5000);
 188                 ret = stk8312_otp_init(data);
 189         }
 190
 191         return ret;
 192 }
 193
 194 static int stk8312_set_interrupts(struct stk8312_data *data, u8 int_mask)
 195 {
 196         int ret;
 197         u8 mode;
 198         struct i2c_client *client = data->client;
 199
 200         mode = data->mode;
 201         /* We need to go in standby mode to modify registers */
 202         ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
 203         if (ret < 0)
 204                 return ret;
 205
 206         ret = i2c_smbus_write_byte_data(client, STK8312_REG_INTSU, int_mask);
 207         if (ret < 0) {
 208                 dev_err(&client->dev, "failed to set interrupts\n");
 209                 stk8312_set_mode(data, mode);
 210                 return ret;
 211         }
 212
 213         return stk8312_set_mode(data, mode);
 214 }
 215
 216 static int stk8312_data_rdy_trigger_set_state(struct iio_trigger *trig,
 217                                               bool state)
 218 {
 219         struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 220         struct stk8312_data *data = iio_priv(indio_dev);
 221         int ret;
 222
 223         if (state)
 224                 ret = stk8312_set_interrupts(data, STK8312_DREADY_BIT);
 225         else
 226                 ret = stk8312_set_interrupts(data, 0x00);
 227
 228         if (ret < 0) {
 229                 dev_err(&data->client->dev, "failed to set trigger state\n");
 230                 return ret;
 231         }
 232
 233         data->dready_trigger_on = state;
 234
 235         return 0;
 236 }
 237
 238 static const struct iio_trigger_ops stk8312_trigger_ops = {
 239         .set_trigger_state = stk8312_data_rdy_trigger_set_state,
 240         .owner = THIS_MODULE,
 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         .driver_module          = THIS_MODULE,
 425         .read_raw               = stk8312_read_raw,
 426         .write_raw              = stk8312_write_raw,
 427         .attrs                  = &stk8312_attribute_group,
 428 };
 429
 430 static irqreturn_t stk8312_trigger_handler(int irq, void *p)
 431 {
 432         struct iio_poll_func *pf = p;
 433         struct iio_dev *indio_dev = pf->indio_dev;
 434         struct stk8312_data *data = iio_priv(indio_dev);
 435         int bit, ret, i = 0;
 436
 437         mutex_lock(&data->lock);
 438         /*
 439          * Do a bulk read if all channels are requested,
 440          * from 0x00 (XOUT) to 0x02 (ZOUT)
 441          */
 442         if (*(indio_dev->active_scan_mask) == STK8312_ALL_CHANNEL_MASK) {
 443                 ret = i2c_smbus_read_i2c_block_data(data->client,
 444                                                     STK8312_REG_XOUT,
 445                                                     STK8312_ALL_CHANNEL_SIZE,
 446                                                     data->buffer);
 447                 if (ret < STK8312_ALL_CHANNEL_SIZE) {
 448                         dev_err(&data->client->dev, "register read failed\n");
 449                         mutex_unlock(&data->lock);
 450                         goto err;
 451                 }
 452         } else {
 453                 for_each_set_bit(bit, indio_dev->active_scan_mask,
 454                                  indio_dev->masklength) {
 455                         ret = stk8312_read_accel(data, bit);
 456                         if (ret < 0) {
 457                                 mutex_unlock(&data->lock);
 458                                 goto err;
 459                         }
 460                         data->buffer[i++] = ret;
 461                 }
 462         }
 463         mutex_unlock(&data->lock);
 464
 465         iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
 466                                            pf->timestamp);
 467 err:
 468         iio_trigger_notify_done(indio_dev->trig);
 469
 470         return IRQ_HANDLED;
 471 }
 472
 473 static irqreturn_t stk8312_data_rdy_trig_poll(int irq, void *private)
 474 {
 475         struct iio_dev *indio_dev = private;
 476         struct stk8312_data *data = iio_priv(indio_dev);
 477
 478         if (data->dready_trigger_on)
 479                 iio_trigger_poll(data->dready_trig);
 480
 481         return IRQ_HANDLED;
 482 }
 483
 484 static int stk8312_buffer_preenable(struct iio_dev *indio_dev)
 485 {
 486         struct stk8312_data *data = iio_priv(indio_dev);
 487
 488         return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
 489 }
 490
 491 static int stk8312_buffer_postdisable(struct iio_dev *indio_dev)
 492 {
 493         struct stk8312_data *data = iio_priv(indio_dev);
 494
 495         return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
 496 }
 497
 498 static const struct iio_buffer_setup_ops stk8312_buffer_setup_ops = {
 499         .preenable   = stk8312_buffer_preenable,
 500         .postenable  = iio_triggered_buffer_postenable,
 501         .predisable  = iio_triggered_buffer_predisable,
 502         .postdisable = stk8312_buffer_postdisable,
 503 };
 504
 505 static int stk8312_probe(struct i2c_client *client,
 506                          const struct i2c_device_id *id)
 507 {
 508         int ret;
 509         struct iio_dev *indio_dev;
 510         struct stk8312_data *data;
 511
 512         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 513         if (!indio_dev) {
 514                 dev_err(&client->dev, "iio allocation failed!\n");
 515                 return -ENOMEM;
 516         }
 517
 518         data = iio_priv(indio_dev);
 519         data->client = client;
 520         i2c_set_clientdata(client, indio_dev);
 521         mutex_init(&data->lock);
 522
 523         indio_dev->dev.parent = &client->dev;
 524         indio_dev->info = &stk8312_info;
 525         indio_dev->name = STK8312_DRIVER_NAME;
 526         indio_dev->modes = INDIO_DIRECT_MODE;
 527         indio_dev->channels = stk8312_channels;
 528         indio_dev->num_channels = ARRAY_SIZE(stk8312_channels);
 529
 530         /* A software reset is recommended at power-on */
 531         ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_RESET, 0x00);
 532         if (ret < 0) {
 533                 dev_err(&client->dev, "failed to reset sensor\n");
 534                 return ret;
 535         }
 536         data->sample_rate_idx = STK8312_SR_400HZ_IDX;
 537         ret = stk8312_set_range(data, STK8312_RNG_6G);
 538         if (ret < 0)
 539                 return ret;
 540
 541         ret = stk8312_set_mode(data,
 542                                STK8312_MODE_INT_AH_PP | STK8312_MODE_ACTIVE);
 543         if (ret < 0)
 544                 return ret;
 545
 546         if (client->irq > 0) {
 547                 ret = devm_request_threaded_irq(&client->dev, client->irq,
 548                                                 stk8312_data_rdy_trig_poll,
 549                                                 NULL,
 550                                                 IRQF_TRIGGER_RISING |
 551                                                 IRQF_ONESHOT,
 552                                                 STK8312_IRQ_NAME,
 553                                                 indio_dev);
 554                 if (ret < 0) {
 555                         dev_err(&client->dev, "request irq %d failed\n",
 556                                 client->irq);
 557                         goto err_power_off;
 558                 }
 559
 560                 data->dready_trig = devm_iio_trigger_alloc(&client->dev,
 561                                                            "%s-dev%d",
 562                                                            indio_dev->name,
 563                                                            indio_dev->id);
 564                 if (!data->dready_trig) {
 565                         ret = -ENOMEM;
 566                         goto err_power_off;
 567                 }
 568
 569                 data->dready_trig->dev.parent = &client->dev;
 570                 data->dready_trig->ops = &stk8312_trigger_ops;
 571                 iio_trigger_set_drvdata(data->dready_trig, indio_dev);
 572                 ret = iio_trigger_register(data->dready_trig);
 573                 if (ret) {
 574                         dev_err(&client->dev, "iio trigger register failed\n");
 575                         goto err_power_off;
 576                 }
 577         }
 578
 579         ret = iio_triggered_buffer_setup(indio_dev,
 580                                          iio_pollfunc_store_time,
 581                                          stk8312_trigger_handler,
 582                                          &stk8312_buffer_setup_ops);
 583         if (ret < 0) {
 584                 dev_err(&client->dev, "iio triggered buffer setup failed\n");
 585                 goto err_trigger_unregister;
 586         }
 587
 588         ret = iio_device_register(indio_dev);
 589         if (ret < 0) {
 590                 dev_err(&client->dev, "device_register failed\n");
 591                 goto err_buffer_cleanup;
 592         }
 593
 594         return 0;
 595
 596 err_buffer_cleanup:
 597         iio_triggered_buffer_cleanup(indio_dev);
 598 err_trigger_unregister:
 599         if (data->dready_trig)
 600                 iio_trigger_unregister(data->dready_trig);
 601 err_power_off:
 602         stk8312_set_mode(data, STK8312_MODE_STANDBY);
 603         return ret;
 604 }
 605
 606 static int stk8312_remove(struct i2c_client *client)
 607 {
 608         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 609         struct stk8312_data *data = iio_priv(indio_dev);
 610
 611         iio_device_unregister(indio_dev);
 612         iio_triggered_buffer_cleanup(indio_dev);
 613
 614         if (data->dready_trig)
 615                 iio_trigger_unregister(data->dready_trig);
 616
 617         return stk8312_set_mode(data, STK8312_MODE_STANDBY);
 618 }
 619
 620 #ifdef CONFIG_PM_SLEEP
 621 static int stk8312_suspend(struct device *dev)
 622 {
 623         struct stk8312_data *data;
 624
 625         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 626
 627         return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
 628 }
 629
 630 static int stk8312_resume(struct device *dev)
 631 {
 632         struct stk8312_data *data;
 633
 634         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 635
 636         return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
 637 }
 638
 639 static SIMPLE_DEV_PM_OPS(stk8312_pm_ops, stk8312_suspend, stk8312_resume);
 640
 641 #define STK8312_PM_OPS (&stk8312_pm_ops)
 642 #else
 643 #define STK8312_PM_OPS NULL
 644 #endif
 645
 646 static const struct i2c_device_id stk8312_i2c_id[] = {
 647         {"STK8312", 0},
 648         {}
 649 };
 650 MODULE_DEVICE_TABLE(i2c, stk8312_i2c_id);
 651
 652 static const struct acpi_device_id stk8312_acpi_id[] = {
 653         {"STK8312", 0},
 654         {}
 655 };
 656
 657 MODULE_DEVICE_TABLE(acpi, stk8312_acpi_id);
 658
 659 static struct i2c_driver stk8312_driver = {
 660         .driver = {
 661                 .name = STK8312_DRIVER_NAME,
 662                 .pm = STK8312_PM_OPS,
 663                 .acpi_match_table = ACPI_PTR(stk8312_acpi_id),
 664         },
 665         .probe =            stk8312_probe,
 666         .remove =           stk8312_remove,
 667         .id_table =         stk8312_i2c_id,
 668 };
 669
 670 module_i2c_driver(stk8312_driver);
 671
 672 MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
 673 MODULE_DESCRIPTION("STK8312 3-Axis Accelerometer driver");
 674 MODULE_LICENSE("GPL v2");