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/gpio/consumer.h>
  15 #include <linux/i2c.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/delay.h>
  20 #include <linux/iio/buffer.h>
  21 #include <linux/iio/iio.h>
  22 #include <linux/iio/sysfs.h>
  23 #include <linux/iio/trigger.h>
  24 #include <linux/iio/triggered_buffer.h>
  25 #include <linux/iio/trigger_consumer.h>
  26
  27 #define STK8312_REG_XOUT                0x00
  28 #define STK8312_REG_YOUT                0x01
  29 #define STK8312_REG_ZOUT                0x02
  30 #define STK8312_REG_INTSU               0x06
  31 #define STK8312_REG_MODE                0x07
  32 #define STK8312_REG_SR                  0x08
  33 #define STK8312_REG_STH                 0x13
  34 #define STK8312_REG_RESET               0x20
  35 #define STK8312_REG_AFECTRL             0x24
  36 #define STK8312_REG_OTPADDR             0x3D
  37 #define STK8312_REG_OTPDATA             0x3E
  38 #define STK8312_REG_OTPCTRL             0x3F
  39
  40 #define STK8312_MODE_ACTIVE             BIT(0)
  41 #define STK8312_MODE_STANDBY            0x00
  42 #define STK8312_MODE_INT_AH_PP          0xC0    /* active-high, push-pull */
  43 #define STK8312_DREADY_BIT              BIT(4)
  44 #define STK8312_RNG_6G                  1
  45 #define STK8312_RNG_SHIFT               6
  46 #define STK8312_RNG_MASK                GENMASK(7, 6)
  47 #define STK8312_SR_MASK                 GENMASK(2, 0)
  48 #define STK8312_SR_400HZ_IDX            0
  49 #define STK8312_ALL_CHANNEL_MASK        GENMASK(2, 0)
  50 #define STK8312_ALL_CHANNEL_SIZE        3
  51
  52 #define STK8312_DRIVER_NAME             "stk8312"
  53 #define STK8312_IRQ_NAME                "stk8312_event"
  54
  55 /*
  56  * The accelerometer has two measurement ranges:
  57  *
  58  * -6g - +6g (8-bit, signed)
  59  * -16g - +16g (8-bit, signed)
  60  *
  61  * scale1 = (6 + 6) * 9.81 / (2^8 - 1)     = 0.4616
  62  * scale2 = (16 + 16) * 9.81 / (2^8 - 1)   = 1.2311
  63  */
  64 #define STK8312_SCALE_AVAIL             "0.4616 1.2311"
  65
  66 static const int stk8312_scale_table[][2] = {
  67         {0, 461600}, {1, 231100}
  68 };
  69
  70 static const struct {
  71         int val;
  72         int val2;
  73 } stk8312_samp_freq_table[] = {
  74         {400, 0}, {200, 0}, {100, 0}, {50, 0}, {25, 0},
  75         {12, 500000}, {6, 250000}, {3, 125000}
  76 };
  77
  78 #define STK8312_ACCEL_CHANNEL(index, reg, axis) {                       \
  79         .type = IIO_ACCEL,                                              \
  80         .address = reg,                                                 \
  81         .modified = 1,                                                  \
  82         .channel2 = IIO_MOD_##axis,                                     \
  83         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),                   \
  84         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |          \
  85                                     BIT(IIO_CHAN_INFO_SAMP_FREQ),       \
  86         .scan_index = index,                                            \
  87         .scan_type = {                                                  \
  88                 .sign = 's',                                            \
  89                 .realbits = 8,                                          \
  90                 .storagebits = 8,                                       \
  91                 .endianness = IIO_CPU,                                  \
  92         },                                                              \
  93 }
  94
  95 static const struct iio_chan_spec stk8312_channels[] = {
  96         STK8312_ACCEL_CHANNEL(0, STK8312_REG_XOUT, X),
  97         STK8312_ACCEL_CHANNEL(1, STK8312_REG_YOUT, Y),
  98         STK8312_ACCEL_CHANNEL(2, STK8312_REG_ZOUT, Z),
  99         IIO_CHAN_SOFT_TIMESTAMP(3),
 100 };
 101
 102 struct stk8312_data {
 103         struct i2c_client *client;
 104         struct mutex lock;
 105         u8 range;
 106         u8 sample_rate_idx;
 107         u8 mode;
 108         struct iio_trigger *dready_trig;
 109         bool dready_trigger_on;
 110         s8 buffer[16]; /* 3x8-bit channels + 5x8 padding + 64-bit timestamp */
 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         .owner = THIS_MODULE,
 242 };
 243
 244 static int stk8312_set_sample_rate(struct stk8312_data *data, u8 rate)
 245 {
 246         int ret;
 247         u8 masked_reg;
 248         u8 mode;
 249         struct i2c_client *client = data->client;
 250
 251         if (rate == data->sample_rate_idx)
 252                 return 0;
 253
 254         mode = data->mode;
 255         /* We need to go in standby mode to modify registers */
 256         ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
 257         if (ret < 0)
 258                 return ret;
 259
 260         ret = i2c_smbus_read_byte_data(client, STK8312_REG_SR);
 261         if (ret < 0)
 262                 goto err_activate;
 263
 264         masked_reg = (ret & (~STK8312_SR_MASK)) | rate;
 265
 266         ret = i2c_smbus_write_byte_data(client, STK8312_REG_SR, masked_reg);
 267         if (ret < 0)
 268                 goto err_activate;
 269
 270         data->sample_rate_idx = rate;
 271
 272         return stk8312_set_mode(data, mode);
 273
 274 err_activate:
 275         dev_err(&client->dev, "failed to set sampling rate\n");
 276         stk8312_set_mode(data, mode);
 277
 278         return ret;
 279 }
 280
 281 static int stk8312_set_range(struct stk8312_data *data, u8 range)
 282 {
 283         int ret;
 284         u8 masked_reg;
 285         u8 mode;
 286         struct i2c_client *client = data->client;
 287
 288         if (range != 1 && range != 2)
 289                 return -EINVAL;
 290         else if (range == data->range)
 291                 return 0;
 292
 293         mode = data->mode;
 294         /* We need to go in standby mode to modify registers */
 295         ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
 296         if (ret < 0)
 297                 return ret;
 298
 299         ret = i2c_smbus_read_byte_data(client, STK8312_REG_STH);
 300         if (ret < 0)
 301                 goto err_activate;
 302
 303         masked_reg = ret & (~STK8312_RNG_MASK);
 304         masked_reg |= range << STK8312_RNG_SHIFT;
 305
 306         ret = i2c_smbus_write_byte_data(client, STK8312_REG_STH, masked_reg);
 307         if (ret < 0)
 308                 goto err_activate;
 309
 310         data->range = range;
 311
 312         return stk8312_set_mode(data, mode);
 313
 314 err_activate:
 315         dev_err(&client->dev, "failed to change sensor range\n");
 316         stk8312_set_mode(data, mode);
 317
 318         return ret;
 319 }
 320
 321 static int stk8312_read_accel(struct stk8312_data *data, u8 address)
 322 {
 323         int ret;
 324         struct i2c_client *client = data->client;
 325
 326         if (address > 2)
 327                 return -EINVAL;
 328
 329         ret = i2c_smbus_read_byte_data(client, address);
 330         if (ret < 0)
 331                 dev_err(&client->dev, "register read failed\n");
 332
 333         return ret;
 334 }
 335
 336 static int stk8312_read_raw(struct iio_dev *indio_dev,
 337                             struct iio_chan_spec const *chan,
 338                             int *val, int *val2, long mask)
 339 {
 340         struct stk8312_data *data = iio_priv(indio_dev);
 341         int ret;
 342
 343         switch (mask) {
 344         case IIO_CHAN_INFO_RAW:
 345                 if (iio_buffer_enabled(indio_dev))
 346                         return -EBUSY;
 347                 mutex_lock(&data->lock);
 348                 ret = stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
 349                 if (ret < 0) {
 350                         mutex_unlock(&data->lock);
 351                         return ret;
 352                 }
 353                 ret = stk8312_read_accel(data, chan->address);
 354                 if (ret < 0) {
 355                         stk8312_set_mode(data,
 356                                          data->mode & (~STK8312_MODE_ACTIVE));
 357                         mutex_unlock(&data->lock);
 358                         return ret;
 359                 }
 360                 *val = sign_extend32(ret, 7);
 361                 ret = stk8312_set_mode(data,
 362                                        data->mode & (~STK8312_MODE_ACTIVE));
 363                 mutex_unlock(&data->lock);
 364                 if (ret < 0)
 365                         return ret;
 366                 return IIO_VAL_INT;
 367         case IIO_CHAN_INFO_SCALE:
 368                 *val = stk8312_scale_table[data->range - 1][0];
 369                 *val2 = stk8312_scale_table[data->range - 1][1];
 370                 return IIO_VAL_INT_PLUS_MICRO;
 371         case IIO_CHAN_INFO_SAMP_FREQ:
 372                 *val = stk8312_samp_freq_table[data->sample_rate_idx].val;
 373                 *val2 = stk8312_samp_freq_table[data->sample_rate_idx].val2;
 374                 return IIO_VAL_INT_PLUS_MICRO;
 375         }
 376
 377         return -EINVAL;
 378 }
 379
 380 static int stk8312_write_raw(struct iio_dev *indio_dev,
 381                              struct iio_chan_spec const *chan,
 382                              int val, int val2, long mask)
 383 {
 384         int i;
 385         int index = -1;
 386         int ret;
 387         struct stk8312_data *data = iio_priv(indio_dev);
 388
 389         switch (mask) {
 390         case IIO_CHAN_INFO_SCALE:
 391                 for (i = 0; i < ARRAY_SIZE(stk8312_scale_table); i++)
 392                         if (val == stk8312_scale_table[i][0] &&
 393                             val2 == stk8312_scale_table[i][1]) {
 394                                 index = i + 1;
 395                                 break;
 396                         }
 397                 if (index < 0)
 398                         return -EINVAL;
 399
 400                 mutex_lock(&data->lock);
 401                 ret = stk8312_set_range(data, index);
 402                 mutex_unlock(&data->lock);
 403
 404                 return ret;
 405         case IIO_CHAN_INFO_SAMP_FREQ:
 406                 for (i = 0; i < ARRAY_SIZE(stk8312_samp_freq_table); i++)
 407                         if (val == stk8312_samp_freq_table[i].val &&
 408                             val2 == stk8312_samp_freq_table[i].val2) {
 409                                 index = i;
 410                                 break;
 411                         }
 412                 if (index < 0)
 413                         return -EINVAL;
 414                 mutex_lock(&data->lock);
 415                 ret = stk8312_set_sample_rate(data, index);
 416                 mutex_unlock(&data->lock);
 417
 418                 return ret;
 419         }
 420
 421         return -EINVAL;
 422 }
 423
 424 static const struct iio_info stk8312_info = {
 425         .driver_module          = THIS_MODULE,
 426         .read_raw               = stk8312_read_raw,
 427         .write_raw              = stk8312_write_raw,
 428         .attrs                  = &stk8312_attribute_group,
 429 };
 430
 431 static irqreturn_t stk8312_trigger_handler(int irq, void *p)
 432 {
 433         struct iio_poll_func *pf = p;
 434         struct iio_dev *indio_dev = pf->indio_dev;
 435         struct stk8312_data *data = iio_priv(indio_dev);
 436         int bit, ret, i = 0;
 437
 438         mutex_lock(&data->lock);
 439         /*
 440          * Do a bulk read if all channels are requested,
 441          * from 0x00 (XOUT) to 0x02 (ZOUT)
 442          */
 443         if (*(indio_dev->active_scan_mask) == STK8312_ALL_CHANNEL_MASK) {
 444                 ret = i2c_smbus_read_i2c_block_data(data->client,
 445                                                     STK8312_REG_XOUT,
 446                                                     STK8312_ALL_CHANNEL_SIZE,
 447                                                     data->buffer);
 448                 if (ret < STK8312_ALL_CHANNEL_SIZE) {
 449                         dev_err(&data->client->dev, "register read failed\n");
 450                         mutex_unlock(&data->lock);
 451                         goto err;
 452                 }
 453         } else {
 454                 for_each_set_bit(bit, indio_dev->active_scan_mask,
 455                                  indio_dev->masklength) {
 456                         ret = stk8312_read_accel(data, bit);
 457                         if (ret < 0) {
 458                                 mutex_unlock(&data->lock);
 459                                 goto err;
 460                         }
 461                         data->buffer[i++] = ret;
 462                 }
 463         }
 464         mutex_unlock(&data->lock);
 465
 466         iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
 467                                            pf->timestamp);
 468 err:
 469         iio_trigger_notify_done(indio_dev->trig);
 470
 471         return IRQ_HANDLED;
 472 }
 473
 474 static irqreturn_t stk8312_data_rdy_trig_poll(int irq, void *private)
 475 {
 476         struct iio_dev *indio_dev = private;
 477         struct stk8312_data *data = iio_priv(indio_dev);
 478
 479         if (data->dready_trigger_on)
 480                 iio_trigger_poll(data->dready_trig);
 481
 482         return IRQ_HANDLED;
 483 }
 484
 485 static int stk8312_buffer_preenable(struct iio_dev *indio_dev)
 486 {
 487         struct stk8312_data *data = iio_priv(indio_dev);
 488
 489         return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
 490 }
 491
 492 static int stk8312_buffer_postdisable(struct iio_dev *indio_dev)
 493 {
 494         struct stk8312_data *data = iio_priv(indio_dev);
 495
 496         return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
 497 }
 498
 499 static const struct iio_buffer_setup_ops stk8312_buffer_setup_ops = {
 500         .preenable   = stk8312_buffer_preenable,
 501         .postenable  = iio_triggered_buffer_postenable,
 502         .predisable  = iio_triggered_buffer_predisable,
 503         .postdisable = stk8312_buffer_postdisable,
 504 };
 505
 506 static int stk8312_probe(struct i2c_client *client,
 507                          const struct i2c_device_id *id)
 508 {
 509         int ret;
 510         struct iio_dev *indio_dev;
 511         struct stk8312_data *data;
 512
 513         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 514         if (!indio_dev) {
 515                 dev_err(&client->dev, "iio allocation failed!\n");
 516                 return -ENOMEM;
 517         }
 518
 519         data = iio_priv(indio_dev);
 520         data->client = client;
 521         i2c_set_clientdata(client, indio_dev);
 522         mutex_init(&data->lock);
 523
 524         indio_dev->dev.parent = &client->dev;
 525         indio_dev->info = &stk8312_info;
 526         indio_dev->name = STK8312_DRIVER_NAME;
 527         indio_dev->modes = INDIO_DIRECT_MODE;
 528         indio_dev->channels = stk8312_channels;
 529         indio_dev->num_channels = ARRAY_SIZE(stk8312_channels);
 530
 531         /* A software reset is recommended at power-on */
 532         ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_RESET, 0x00);
 533         if (ret < 0) {
 534                 dev_err(&client->dev, "failed to reset sensor\n");
 535                 return ret;
 536         }
 537         data->sample_rate_idx = STK8312_SR_400HZ_IDX;
 538         ret = stk8312_set_range(data, STK8312_RNG_6G);
 539         if (ret < 0)
 540                 return ret;
 541
 542         ret = stk8312_set_mode(data,
 543                                STK8312_MODE_INT_AH_PP | STK8312_MODE_ACTIVE);
 544         if (ret < 0)
 545                 return ret;
 546
 547         if (client->irq > 0) {
 548                 ret = devm_request_threaded_irq(&client->dev, client->irq,
 549                                                 stk8312_data_rdy_trig_poll,
 550                                                 NULL,
 551                                                 IRQF_TRIGGER_RISING |
 552                                                 IRQF_ONESHOT,
 553                                                 STK8312_IRQ_NAME,
 554                                                 indio_dev);
 555                 if (ret < 0) {
 556                         dev_err(&client->dev, "request irq %d failed\n",
 557                                 client->irq);
 558                         goto err_power_off;
 559                 }
 560
 561                 data->dready_trig = devm_iio_trigger_alloc(&client->dev,
 562                                                            "%s-dev%d",
 563                                                            indio_dev->name,
 564                                                            indio_dev->id);
 565                 if (!data->dready_trig) {
 566                         ret = -ENOMEM;
 567                         goto err_power_off;
 568                 }
 569
 570                 data->dready_trig->dev.parent = &client->dev;
 571                 data->dready_trig->ops = &stk8312_trigger_ops;
 572                 iio_trigger_set_drvdata(data->dready_trig, indio_dev);
 573                 ret = iio_trigger_register(data->dready_trig);
 574                 if (ret) {
 575                         dev_err(&client->dev, "iio trigger register failed\n");
 576                         goto err_power_off;
 577                 }
 578         }
 579
 580         ret = iio_triggered_buffer_setup(indio_dev,
 581                                          iio_pollfunc_store_time,
 582                                          stk8312_trigger_handler,
 583                                          &stk8312_buffer_setup_ops);
 584         if (ret < 0) {
 585                 dev_err(&client->dev, "iio triggered buffer setup failed\n");
 586                 goto err_trigger_unregister;
 587         }
 588
 589         ret = iio_device_register(indio_dev);
 590         if (ret < 0) {
 591                 dev_err(&client->dev, "device_register failed\n");
 592                 goto err_buffer_cleanup;
 593         }
 594
 595         return 0;
 596
 597 err_buffer_cleanup:
 598         iio_triggered_buffer_cleanup(indio_dev);
 599 err_trigger_unregister:
 600         if (data->dready_trig)
 601                 iio_trigger_unregister(data->dready_trig);
 602 err_power_off:
 603         stk8312_set_mode(data, STK8312_MODE_STANDBY);
 604         return ret;
 605 }
 606
 607 static int stk8312_remove(struct i2c_client *client)
 608 {
 609         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 610         struct stk8312_data *data = iio_priv(indio_dev);
 611
 612         iio_device_unregister(indio_dev);
 613         iio_triggered_buffer_cleanup(indio_dev);
 614
 615         if (data->dready_trig)
 616                 iio_trigger_unregister(data->dready_trig);
 617
 618         return stk8312_set_mode(data, STK8312_MODE_STANDBY);
 619 }
 620
 621 #ifdef CONFIG_PM_SLEEP
 622 static int stk8312_suspend(struct device *dev)
 623 {
 624         struct stk8312_data *data;
 625
 626         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 627
 628         return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
 629 }
 630
 631 static int stk8312_resume(struct device *dev)
 632 {
 633         struct stk8312_data *data;
 634
 635         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 636
 637         return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
 638 }
 639
 640 static SIMPLE_DEV_PM_OPS(stk8312_pm_ops, stk8312_suspend, stk8312_resume);
 641
 642 #define STK8312_PM_OPS (&stk8312_pm_ops)
 643 #else
 644 #define STK8312_PM_OPS NULL
 645 #endif
 646
 647 static const struct i2c_device_id stk8312_i2c_id[] = {
 648         {"STK8312", 0},
 649         {}
 650 };
 651 MODULE_DEVICE_TABLE(i2c, stk8312_i2c_id);
 652
 653 static const struct acpi_device_id stk8312_acpi_id[] = {
 654         {"STK8312", 0},
 655         {}
 656 };
 657
 658 MODULE_DEVICE_TABLE(acpi, stk8312_acpi_id);
 659
 660 static struct i2c_driver stk8312_driver = {
 661         .driver = {
 662                 .name = STK8312_DRIVER_NAME,
 663                 .pm = STK8312_PM_OPS,
 664                 .acpi_match_table = ACPI_PTR(stk8312_acpi_id),
 665         },
 666         .probe =            stk8312_probe,
 667         .remove =           stk8312_remove,
 668         .id_table =         stk8312_i2c_id,
 669 };
 670
 671 module_i2c_driver(stk8312_driver);
 672
 673 MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
 674 MODULE_DESCRIPTION("STK8312 3-Axis Accelerometer driver");
 675 MODULE_LICENSE("GPL v2");