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         /* Ensure timestamp is naturally aligned */
 110         struct {
 111                 s8 chans[3];
 112                 s64 timestamp __aligned(8);
 113         } scan;
 114 };
 115
 116 static IIO_CONST_ATTR(in_accel_scale_available, STK8312_SCALE_AVAIL);
 117
 118 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("3.125 6.25 12.5 25 50 100 200 400");
 119
 120 static struct attribute *stk8312_attributes[] = {
 121         &iio_const_attr_in_accel_scale_available.dev_attr.attr,
 122         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 123         NULL,
 124 };
 125
 126 static const struct attribute_group stk8312_attribute_group = {
 127         .attrs = stk8312_attributes
 128 };
 129
 130 static int stk8312_otp_init(struct stk8312_data *data)
 131 {
 132         int ret;
 133         int count = 10;
 134         struct i2c_client *client = data->client;
 135
 136         ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPADDR, 0x70);
 137         if (ret < 0)
 138                 goto exit_err;
 139         ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPCTRL, 0x02);
 140         if (ret < 0)
 141                 goto exit_err;
 142
 143         do {
 144                 usleep_range(1000, 5000);
 145                 ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPCTRL);
 146                 if (ret < 0)
 147                         goto exit_err;
 148                 count--;
 149         } while (!(ret & BIT(7)) && count > 0);
 150
 151         if (count == 0) {
 152                 ret = -ETIMEDOUT;
 153                 goto exit_err;
 154         }
 155
 156         ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPDATA);
 157         if (ret == 0)
 158                 ret = -EINVAL;
 159         if (ret < 0)
 160                 goto exit_err;
 161
 162         ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_AFECTRL, ret);
 163         if (ret < 0)
 164                 goto exit_err;
 165         msleep(150);
 166
 167         return 0;
 168
 169 exit_err:
 170         dev_err(&client->dev, "failed to initialize sensor\n");
 171         return ret;
 172 }
 173
 174 static int stk8312_set_mode(struct stk8312_data *data, u8 mode)
 175 {
 176         int ret;
 177         struct i2c_client *client = data->client;
 178
 179         if (mode == data->mode)
 180                 return 0;
 181
 182         ret = i2c_smbus_write_byte_data(client, STK8312_REG_MODE, mode);
 183         if (ret < 0) {
 184                 dev_err(&client->dev, "failed to change sensor mode\n");
 185                 return ret;
 186         }
 187
 188         data->mode = mode;
 189         if (mode & STK8312_MODE_ACTIVE) {
 190                 /* Need to run OTP sequence before entering active mode */
 191                 usleep_range(1000, 5000);
 192                 ret = stk8312_otp_init(data);
 193         }
 194
 195         return ret;
 196 }
 197
 198 static int stk8312_set_interrupts(struct stk8312_data *data, u8 int_mask)
 199 {
 200         int ret;
 201         u8 mode;
 202         struct i2c_client *client = data->client;
 203
 204         mode = data->mode;
 205         /* We need to go in standby mode to modify registers */
 206         ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
 207         if (ret < 0)
 208                 return ret;
 209
 210         ret = i2c_smbus_write_byte_data(client, STK8312_REG_INTSU, int_mask);
 211         if (ret < 0) {
 212                 dev_err(&client->dev, "failed to set interrupts\n");
 213                 stk8312_set_mode(data, mode);
 214                 return ret;
 215         }
 216
 217         return stk8312_set_mode(data, mode);
 218 }
 219
 220 static int stk8312_data_rdy_trigger_set_state(struct iio_trigger *trig,
 221                                               bool state)
 222 {
 223         struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 224         struct stk8312_data *data = iio_priv(indio_dev);
 225         int ret;
 226
 227         if (state)
 228                 ret = stk8312_set_interrupts(data, STK8312_DREADY_BIT);
 229         else
 230                 ret = stk8312_set_interrupts(data, 0x00);
 231
 232         if (ret < 0) {
 233                 dev_err(&data->client->dev, "failed to set trigger state\n");
 234                 return ret;
 235         }
 236
 237         data->dready_trigger_on = state;
 238
 239         return 0;
 240 }
 241
 242 static const struct iio_trigger_ops stk8312_trigger_ops = {
 243         .set_trigger_state = stk8312_data_rdy_trigger_set_state,
 244         .owner = THIS_MODULE,
 245 };
 246
 247 static int stk8312_set_sample_rate(struct stk8312_data *data, u8 rate)
 248 {
 249         int ret;
 250         u8 masked_reg;
 251         u8 mode;
 252         struct i2c_client *client = data->client;
 253
 254         if (rate == data->sample_rate_idx)
 255                 return 0;
 256
 257         mode = data->mode;
 258         /* We need to go in standby mode to modify registers */
 259         ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
 260         if (ret < 0)
 261                 return ret;
 262
 263         ret = i2c_smbus_read_byte_data(client, STK8312_REG_SR);
 264         if (ret < 0)
 265                 goto err_activate;
 266
 267         masked_reg = (ret & (~STK8312_SR_MASK)) | rate;
 268
 269         ret = i2c_smbus_write_byte_data(client, STK8312_REG_SR, masked_reg);
 270         if (ret < 0)
 271                 goto err_activate;
 272
 273         data->sample_rate_idx = rate;
 274
 275         return stk8312_set_mode(data, mode);
 276
 277 err_activate:
 278         dev_err(&client->dev, "failed to set sampling rate\n");
 279         stk8312_set_mode(data, mode);
 280
 281         return ret;
 282 }
 283
 284 static int stk8312_set_range(struct stk8312_data *data, u8 range)
 285 {
 286         int ret;
 287         u8 masked_reg;
 288         u8 mode;
 289         struct i2c_client *client = data->client;
 290
 291         if (range != 1 && range != 2)
 292                 return -EINVAL;
 293         else if (range == data->range)
 294                 return 0;
 295
 296         mode = data->mode;
 297         /* We need to go in standby mode to modify registers */
 298         ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
 299         if (ret < 0)
 300                 return ret;
 301
 302         ret = i2c_smbus_read_byte_data(client, STK8312_REG_STH);
 303         if (ret < 0)
 304                 goto err_activate;
 305
 306         masked_reg = ret & (~STK8312_RNG_MASK);
 307         masked_reg |= range << STK8312_RNG_SHIFT;
 308
 309         ret = i2c_smbus_write_byte_data(client, STK8312_REG_STH, masked_reg);
 310         if (ret < 0)
 311                 goto err_activate;
 312
 313         data->range = range;
 314
 315         return stk8312_set_mode(data, mode);
 316
 317 err_activate:
 318         dev_err(&client->dev, "failed to change sensor range\n");
 319         stk8312_set_mode(data, mode);
 320
 321         return ret;
 322 }
 323
 324 static int stk8312_read_accel(struct stk8312_data *data, u8 address)
 325 {
 326         int ret;
 327         struct i2c_client *client = data->client;
 328
 329         if (address > 2)
 330                 return -EINVAL;
 331
 332         ret = i2c_smbus_read_byte_data(client, address);
 333         if (ret < 0)
 334                 dev_err(&client->dev, "register read failed\n");
 335
 336         return ret;
 337 }
 338
 339 static int stk8312_read_raw(struct iio_dev *indio_dev,
 340                             struct iio_chan_spec const *chan,
 341                             int *val, int *val2, long mask)
 342 {
 343         struct stk8312_data *data = iio_priv(indio_dev);
 344         int ret;
 345
 346         switch (mask) {
 347         case IIO_CHAN_INFO_RAW:
 348                 if (iio_buffer_enabled(indio_dev))
 349                         return -EBUSY;
 350                 mutex_lock(&data->lock);
 351                 ret = stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
 352                 if (ret < 0) {
 353                         mutex_unlock(&data->lock);
 354                         return ret;
 355                 }
 356                 ret = stk8312_read_accel(data, chan->address);
 357                 if (ret < 0) {
 358                         stk8312_set_mode(data,
 359                                          data->mode & (~STK8312_MODE_ACTIVE));
 360                         mutex_unlock(&data->lock);
 361                         return ret;
 362                 }
 363                 *val = sign_extend32(ret, 7);
 364                 ret = stk8312_set_mode(data,
 365                                        data->mode & (~STK8312_MODE_ACTIVE));
 366                 mutex_unlock(&data->lock);
 367                 if (ret < 0)
 368                         return ret;
 369                 return IIO_VAL_INT;
 370         case IIO_CHAN_INFO_SCALE:
 371                 *val = stk8312_scale_table[data->range - 1][0];
 372                 *val2 = stk8312_scale_table[data->range - 1][1];
 373                 return IIO_VAL_INT_PLUS_MICRO;
 374         case IIO_CHAN_INFO_SAMP_FREQ:
 375                 *val = stk8312_samp_freq_table[data->sample_rate_idx].val;
 376                 *val2 = stk8312_samp_freq_table[data->sample_rate_idx].val2;
 377                 return IIO_VAL_INT_PLUS_MICRO;
 378         }
 379
 380         return -EINVAL;
 381 }
 382
 383 static int stk8312_write_raw(struct iio_dev *indio_dev,
 384                              struct iio_chan_spec const *chan,
 385                              int val, int val2, long mask)
 386 {
 387         int i;
 388         int index = -1;
 389         int ret;
 390         struct stk8312_data *data = iio_priv(indio_dev);
 391
 392         switch (mask) {
 393         case IIO_CHAN_INFO_SCALE:
 394                 for (i = 0; i < ARRAY_SIZE(stk8312_scale_table); i++)
 395                         if (val == stk8312_scale_table[i][0] &&
 396                             val2 == stk8312_scale_table[i][1]) {
 397                                 index = i + 1;
 398                                 break;
 399                         }
 400                 if (index < 0)
 401                         return -EINVAL;
 402
 403                 mutex_lock(&data->lock);
 404                 ret = stk8312_set_range(data, index);
 405                 mutex_unlock(&data->lock);
 406
 407                 return ret;
 408         case IIO_CHAN_INFO_SAMP_FREQ:
 409                 for (i = 0; i < ARRAY_SIZE(stk8312_samp_freq_table); i++)
 410                         if (val == stk8312_samp_freq_table[i].val &&
 411                             val2 == stk8312_samp_freq_table[i].val2) {
 412                                 index = i;
 413                                 break;
 414                         }
 415                 if (index < 0)
 416                         return -EINVAL;
 417                 mutex_lock(&data->lock);
 418                 ret = stk8312_set_sample_rate(data, index);
 419                 mutex_unlock(&data->lock);
 420
 421                 return ret;
 422         }
 423
 424         return -EINVAL;
 425 }
 426
 427 static const struct iio_info stk8312_info = {
 428         .driver_module          = THIS_MODULE,
 429         .read_raw               = stk8312_read_raw,
 430         .write_raw              = stk8312_write_raw,
 431         .attrs                  = &stk8312_attribute_group,
 432 };
 433
 434 static irqreturn_t stk8312_trigger_handler(int irq, void *p)
 435 {
 436         struct iio_poll_func *pf = p;
 437         struct iio_dev *indio_dev = pf->indio_dev;
 438         struct stk8312_data *data = iio_priv(indio_dev);
 439         int bit, ret, i = 0;
 440
 441         mutex_lock(&data->lock);
 442         /*
 443          * Do a bulk read if all channels are requested,
 444          * from 0x00 (XOUT) to 0x02 (ZOUT)
 445          */
 446         if (*(indio_dev->active_scan_mask) == STK8312_ALL_CHANNEL_MASK) {
 447                 ret = i2c_smbus_read_i2c_block_data(data->client,
 448                                                     STK8312_REG_XOUT,
 449                                                     STK8312_ALL_CHANNEL_SIZE,
 450                                                     data->scan.chans);
 451                 if (ret < STK8312_ALL_CHANNEL_SIZE) {
 452                         dev_err(&data->client->dev, "register read failed\n");
 453                         mutex_unlock(&data->lock);
 454                         goto err;
 455                 }
 456         } else {
 457                 for_each_set_bit(bit, indio_dev->active_scan_mask,
 458                                  indio_dev->masklength) {
 459                         ret = stk8312_read_accel(data, bit);
 460                         if (ret < 0) {
 461                                 mutex_unlock(&data->lock);
 462                                 goto err;
 463                         }
 464                         data->scan.chans[i++] = ret;
 465                 }
 466         }
 467         mutex_unlock(&data->lock);
 468
 469         iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
 470                                            pf->timestamp);
 471 err:
 472         iio_trigger_notify_done(indio_dev->trig);
 473
 474         return IRQ_HANDLED;
 475 }
 476
 477 static irqreturn_t stk8312_data_rdy_trig_poll(int irq, void *private)
 478 {
 479         struct iio_dev *indio_dev = private;
 480         struct stk8312_data *data = iio_priv(indio_dev);
 481
 482         if (data->dready_trigger_on)
 483                 iio_trigger_poll(data->dready_trig);
 484
 485         return IRQ_HANDLED;
 486 }
 487
 488 static int stk8312_buffer_preenable(struct iio_dev *indio_dev)
 489 {
 490         struct stk8312_data *data = iio_priv(indio_dev);
 491
 492         return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
 493 }
 494
 495 static int stk8312_buffer_postdisable(struct iio_dev *indio_dev)
 496 {
 497         struct stk8312_data *data = iio_priv(indio_dev);
 498
 499         return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
 500 }
 501
 502 static const struct iio_buffer_setup_ops stk8312_buffer_setup_ops = {
 503         .preenable   = stk8312_buffer_preenable,
 504         .postenable  = iio_triggered_buffer_postenable,
 505         .predisable  = iio_triggered_buffer_predisable,
 506         .postdisable = stk8312_buffer_postdisable,
 507 };
 508
 509 static int stk8312_probe(struct i2c_client *client,
 510                          const struct i2c_device_id *id)
 511 {
 512         int ret;
 513         struct iio_dev *indio_dev;
 514         struct stk8312_data *data;
 515
 516         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 517         if (!indio_dev) {
 518                 dev_err(&client->dev, "iio allocation failed!\n");
 519                 return -ENOMEM;
 520         }
 521
 522         data = iio_priv(indio_dev);
 523         data->client = client;
 524         i2c_set_clientdata(client, indio_dev);
 525         mutex_init(&data->lock);
 526
 527         indio_dev->dev.parent = &client->dev;
 528         indio_dev->info = &stk8312_info;
 529         indio_dev->name = STK8312_DRIVER_NAME;
 530         indio_dev->modes = INDIO_DIRECT_MODE;
 531         indio_dev->channels = stk8312_channels;
 532         indio_dev->num_channels = ARRAY_SIZE(stk8312_channels);
 533
 534         /* A software reset is recommended at power-on */
 535         ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_RESET, 0x00);
 536         if (ret < 0) {
 537                 dev_err(&client->dev, "failed to reset sensor\n");
 538                 return ret;
 539         }
 540         data->sample_rate_idx = STK8312_SR_400HZ_IDX;
 541         ret = stk8312_set_range(data, STK8312_RNG_6G);
 542         if (ret < 0)
 543                 return ret;
 544
 545         ret = stk8312_set_mode(data,
 546                                STK8312_MODE_INT_AH_PP | STK8312_MODE_ACTIVE);
 547         if (ret < 0)
 548                 return ret;
 549
 550         if (client->irq > 0) {
 551                 ret = devm_request_threaded_irq(&client->dev, client->irq,
 552                                                 stk8312_data_rdy_trig_poll,
 553                                                 NULL,
 554                                                 IRQF_TRIGGER_RISING |
 555                                                 IRQF_ONESHOT,
 556                                                 STK8312_IRQ_NAME,
 557                                                 indio_dev);
 558                 if (ret < 0) {
 559                         dev_err(&client->dev, "request irq %d failed\n",
 560                                 client->irq);
 561                         goto err_power_off;
 562                 }
 563
 564                 data->dready_trig = devm_iio_trigger_alloc(&client->dev,
 565                                                            "%s-dev%d",
 566                                                            indio_dev->name,
 567                                                            indio_dev->id);
 568                 if (!data->dready_trig) {
 569                         ret = -ENOMEM;
 570                         goto err_power_off;
 571                 }
 572
 573                 data->dready_trig->dev.parent = &client->dev;
 574                 data->dready_trig->ops = &stk8312_trigger_ops;
 575                 iio_trigger_set_drvdata(data->dready_trig, indio_dev);
 576                 ret = iio_trigger_register(data->dready_trig);
 577                 if (ret) {
 578                         dev_err(&client->dev, "iio trigger register failed\n");
 579                         goto err_power_off;
 580                 }
 581         }
 582
 583         ret = iio_triggered_buffer_setup(indio_dev,
 584                                          iio_pollfunc_store_time,
 585                                          stk8312_trigger_handler,
 586                                          &stk8312_buffer_setup_ops);
 587         if (ret < 0) {
 588                 dev_err(&client->dev, "iio triggered buffer setup failed\n");
 589                 goto err_trigger_unregister;
 590         }
 591
 592         ret = iio_device_register(indio_dev);
 593         if (ret < 0) {
 594                 dev_err(&client->dev, "device_register failed\n");
 595                 goto err_buffer_cleanup;
 596         }
 597
 598         return 0;
 599
 600 err_buffer_cleanup:
 601         iio_triggered_buffer_cleanup(indio_dev);
 602 err_trigger_unregister:
 603         if (data->dready_trig)
 604                 iio_trigger_unregister(data->dready_trig);
 605 err_power_off:
 606         stk8312_set_mode(data, STK8312_MODE_STANDBY);
 607         return ret;
 608 }
 609
 610 static int stk8312_remove(struct i2c_client *client)
 611 {
 612         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 613         struct stk8312_data *data = iio_priv(indio_dev);
 614
 615         iio_device_unregister(indio_dev);
 616         iio_triggered_buffer_cleanup(indio_dev);
 617
 618         if (data->dready_trig)
 619                 iio_trigger_unregister(data->dready_trig);
 620
 621         return stk8312_set_mode(data, STK8312_MODE_STANDBY);
 622 }
 623
 624 #ifdef CONFIG_PM_SLEEP
 625 static int stk8312_suspend(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 int stk8312_resume(struct device *dev)
 635 {
 636         struct stk8312_data *data;
 637
 638         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 639
 640         return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
 641 }
 642
 643 static SIMPLE_DEV_PM_OPS(stk8312_pm_ops, stk8312_suspend, stk8312_resume);
 644
 645 #define STK8312_PM_OPS (&stk8312_pm_ops)
 646 #else
 647 #define STK8312_PM_OPS NULL
 648 #endif
 649
 650 static const struct i2c_device_id stk8312_i2c_id[] = {
 651         {"STK8312", 0},
 652         {}
 653 };
 654 MODULE_DEVICE_TABLE(i2c, stk8312_i2c_id);
 655
 656 static const struct acpi_device_id stk8312_acpi_id[] = {
 657         {"STK8312", 0},
 658         {}
 659 };
 660
 661 MODULE_DEVICE_TABLE(acpi, stk8312_acpi_id);
 662
 663 static struct i2c_driver stk8312_driver = {
 664         .driver = {
 665                 .name = STK8312_DRIVER_NAME,
 666                 .pm = STK8312_PM_OPS,
 667                 .acpi_match_table = ACPI_PTR(stk8312_acpi_id),
 668         },
 669         .probe =            stk8312_probe,
 670         .remove =           stk8312_remove,
 671         .id_table =         stk8312_i2c_id,
 672 };
 673
 674 module_i2c_driver(stk8312_driver);
 675
 676 MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
 677 MODULE_DESCRIPTION("STK8312 3-Axis Accelerometer driver");
 678 MODULE_LICENSE("GPL v2");