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