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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Sensortek STK8312 3-Axis Accelerometer
0004  *
0005  * Copyright (c) 2015, Intel Corporation.
0006  *
0007  * IIO driver for STK8312; 7-bit I2C address: 0x3D.
0008  */
0009 
0010 #include <linux/i2c.h>
0011 #include <linux/interrupt.h>
0012 #include <linux/kernel.h>
0013 #include <linux/module.h>
0014 #include <linux/delay.h>
0015 #include <linux/iio/buffer.h>
0016 #include <linux/iio/iio.h>
0017 #include <linux/iio/sysfs.h>
0018 #include <linux/iio/trigger.h>
0019 #include <linux/iio/triggered_buffer.h>
0020 #include <linux/iio/trigger_consumer.h>
0021 
0022 #define STK8312_REG_XOUT        0x00
0023 #define STK8312_REG_YOUT        0x01
0024 #define STK8312_REG_ZOUT        0x02
0025 #define STK8312_REG_INTSU       0x06
0026 #define STK8312_REG_MODE        0x07
0027 #define STK8312_REG_SR          0x08
0028 #define STK8312_REG_STH         0x13
0029 #define STK8312_REG_RESET       0x20
0030 #define STK8312_REG_AFECTRL     0x24
0031 #define STK8312_REG_OTPADDR     0x3D
0032 #define STK8312_REG_OTPDATA     0x3E
0033 #define STK8312_REG_OTPCTRL     0x3F
0034 
0035 #define STK8312_MODE_ACTIVE     BIT(0)
0036 #define STK8312_MODE_STANDBY        0x00
0037 #define STK8312_MODE_INT_AH_PP      0xC0    /* active-high, push-pull */
0038 #define STK8312_DREADY_BIT      BIT(4)
0039 #define STK8312_RNG_6G          1
0040 #define STK8312_RNG_SHIFT       6
0041 #define STK8312_RNG_MASK        GENMASK(7, 6)
0042 #define STK8312_SR_MASK         GENMASK(2, 0)
0043 #define STK8312_SR_400HZ_IDX        0
0044 #define STK8312_ALL_CHANNEL_MASK    GENMASK(2, 0)
0045 #define STK8312_ALL_CHANNEL_SIZE    3
0046 
0047 #define STK8312_DRIVER_NAME     "stk8312"
0048 #define STK8312_IRQ_NAME        "stk8312_event"
0049 
0050 /*
0051  * The accelerometer has two measurement ranges:
0052  *
0053  * -6g - +6g (8-bit, signed)
0054  * -16g - +16g (8-bit, signed)
0055  *
0056  * scale1 = (6 + 6) * 9.81 / (2^8 - 1)     = 0.4616
0057  * scale2 = (16 + 16) * 9.81 / (2^8 - 1)   = 1.2311
0058  */
0059 #define STK8312_SCALE_AVAIL     "0.4616 1.2311"
0060 
0061 static const int stk8312_scale_table[][2] = {
0062     {0, 461600}, {1, 231100}
0063 };
0064 
0065 static const struct {
0066     int val;
0067     int val2;
0068 } stk8312_samp_freq_table[] = {
0069     {400, 0}, {200, 0}, {100, 0}, {50, 0}, {25, 0},
0070     {12, 500000}, {6, 250000}, {3, 125000}
0071 };
0072 
0073 #define STK8312_ACCEL_CHANNEL(index, reg, axis) {           \
0074     .type = IIO_ACCEL,                      \
0075     .address = reg,                         \
0076     .modified = 1,                          \
0077     .channel2 = IIO_MOD_##axis,                 \
0078     .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),           \
0079     .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |      \
0080                     BIT(IIO_CHAN_INFO_SAMP_FREQ),   \
0081     .scan_index = index,                        \
0082     .scan_type = {                          \
0083         .sign = 's',                        \
0084         .realbits = 8,                      \
0085         .storagebits = 8,                   \
0086         .endianness = IIO_CPU,                  \
0087     },                              \
0088 }
0089 
0090 static const struct iio_chan_spec stk8312_channels[] = {
0091     STK8312_ACCEL_CHANNEL(0, STK8312_REG_XOUT, X),
0092     STK8312_ACCEL_CHANNEL(1, STK8312_REG_YOUT, Y),
0093     STK8312_ACCEL_CHANNEL(2, STK8312_REG_ZOUT, Z),
0094     IIO_CHAN_SOFT_TIMESTAMP(3),
0095 };
0096 
0097 struct stk8312_data {
0098     struct i2c_client *client;
0099     struct mutex lock;
0100     u8 range;
0101     u8 sample_rate_idx;
0102     u8 mode;
0103     struct iio_trigger *dready_trig;
0104     bool dready_trigger_on;
0105     /* Ensure timestamp is naturally aligned */
0106     struct {
0107         s8 chans[3];
0108         s64 timestamp __aligned(8);
0109     } scan;
0110 };
0111 
0112 static IIO_CONST_ATTR(in_accel_scale_available, STK8312_SCALE_AVAIL);
0113 
0114 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("3.125 6.25 12.5 25 50 100 200 400");
0115 
0116 static struct attribute *stk8312_attributes[] = {
0117     &iio_const_attr_in_accel_scale_available.dev_attr.attr,
0118     &iio_const_attr_sampling_frequency_available.dev_attr.attr,
0119     NULL,
0120 };
0121 
0122 static const struct attribute_group stk8312_attribute_group = {
0123     .attrs = stk8312_attributes
0124 };
0125 
0126 static int stk8312_otp_init(struct stk8312_data *data)
0127 {
0128     int ret;
0129     int count = 10;
0130     struct i2c_client *client = data->client;
0131 
0132     ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPADDR, 0x70);
0133     if (ret < 0)
0134         goto exit_err;
0135     ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPCTRL, 0x02);
0136     if (ret < 0)
0137         goto exit_err;
0138 
0139     do {
0140         usleep_range(1000, 5000);
0141         ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPCTRL);
0142         if (ret < 0)
0143             goto exit_err;
0144         count--;
0145     } while (!(ret & BIT(7)) && count > 0);
0146 
0147     if (count == 0) {
0148         ret = -ETIMEDOUT;
0149         goto exit_err;
0150     }
0151 
0152     ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPDATA);
0153     if (ret == 0)
0154         ret = -EINVAL;
0155     if (ret < 0)
0156         goto exit_err;
0157 
0158     ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_AFECTRL, ret);
0159     if (ret < 0)
0160         goto exit_err;
0161     msleep(150);
0162 
0163     return 0;
0164 
0165 exit_err:
0166     dev_err(&client->dev, "failed to initialize sensor\n");
0167     return ret;
0168 }
0169 
0170 static int stk8312_set_mode(struct stk8312_data *data, u8 mode)
0171 {
0172     int ret;
0173     struct i2c_client *client = data->client;
0174 
0175     if (mode == data->mode)
0176         return 0;
0177 
0178     ret = i2c_smbus_write_byte_data(client, STK8312_REG_MODE, mode);
0179     if (ret < 0) {
0180         dev_err(&client->dev, "failed to change sensor mode\n");
0181         return ret;
0182     }
0183 
0184     data->mode = mode;
0185     if (mode & STK8312_MODE_ACTIVE) {
0186         /* Need to run OTP sequence before entering active mode */
0187         usleep_range(1000, 5000);
0188         ret = stk8312_otp_init(data);
0189     }
0190 
0191     return ret;
0192 }
0193 
0194 static int stk8312_set_interrupts(struct stk8312_data *data, u8 int_mask)
0195 {
0196     int ret;
0197     u8 mode;
0198     struct i2c_client *client = data->client;
0199 
0200     mode = data->mode;
0201     /* We need to go in standby mode to modify registers */
0202     ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
0203     if (ret < 0)
0204         return ret;
0205 
0206     ret = i2c_smbus_write_byte_data(client, STK8312_REG_INTSU, int_mask);
0207     if (ret < 0) {
0208         dev_err(&client->dev, "failed to set interrupts\n");
0209         stk8312_set_mode(data, mode);
0210         return ret;
0211     }
0212 
0213     return stk8312_set_mode(data, mode);
0214 }
0215 
0216 static int stk8312_data_rdy_trigger_set_state(struct iio_trigger *trig,
0217                           bool state)
0218 {
0219     struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
0220     struct stk8312_data *data = iio_priv(indio_dev);
0221     int ret;
0222 
0223     if (state)
0224         ret = stk8312_set_interrupts(data, STK8312_DREADY_BIT);
0225     else
0226         ret = stk8312_set_interrupts(data, 0x00);
0227 
0228     if (ret < 0) {
0229         dev_err(&data->client->dev, "failed to set trigger state\n");
0230         return ret;
0231     }
0232 
0233     data->dready_trigger_on = state;
0234 
0235     return 0;
0236 }
0237 
0238 static const struct iio_trigger_ops stk8312_trigger_ops = {
0239     .set_trigger_state = stk8312_data_rdy_trigger_set_state,
0240 };
0241 
0242 static int stk8312_set_sample_rate(struct stk8312_data *data, u8 rate)
0243 {
0244     int ret;
0245     u8 masked_reg;
0246     u8 mode;
0247     struct i2c_client *client = data->client;
0248 
0249     if (rate == data->sample_rate_idx)
0250         return 0;
0251 
0252     mode = data->mode;
0253     /* We need to go in standby mode to modify registers */
0254     ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
0255     if (ret < 0)
0256         return ret;
0257 
0258     ret = i2c_smbus_read_byte_data(client, STK8312_REG_SR);
0259     if (ret < 0)
0260         goto err_activate;
0261 
0262     masked_reg = (ret & (~STK8312_SR_MASK)) | rate;
0263 
0264     ret = i2c_smbus_write_byte_data(client, STK8312_REG_SR, masked_reg);
0265     if (ret < 0)
0266         goto err_activate;
0267 
0268     data->sample_rate_idx = rate;
0269 
0270     return stk8312_set_mode(data, mode);
0271 
0272 err_activate:
0273     dev_err(&client->dev, "failed to set sampling rate\n");
0274     stk8312_set_mode(data, mode);
0275 
0276     return ret;
0277 }
0278 
0279 static int stk8312_set_range(struct stk8312_data *data, u8 range)
0280 {
0281     int ret;
0282     u8 masked_reg;
0283     u8 mode;
0284     struct i2c_client *client = data->client;
0285 
0286     if (range != 1 && range != 2)
0287         return -EINVAL;
0288     else if (range == data->range)
0289         return 0;
0290 
0291     mode = data->mode;
0292     /* We need to go in standby mode to modify registers */
0293     ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
0294     if (ret < 0)
0295         return ret;
0296 
0297     ret = i2c_smbus_read_byte_data(client, STK8312_REG_STH);
0298     if (ret < 0)
0299         goto err_activate;
0300 
0301     masked_reg = ret & (~STK8312_RNG_MASK);
0302     masked_reg |= range << STK8312_RNG_SHIFT;
0303 
0304     ret = i2c_smbus_write_byte_data(client, STK8312_REG_STH, masked_reg);
0305     if (ret < 0)
0306         goto err_activate;
0307 
0308     data->range = range;
0309 
0310     return stk8312_set_mode(data, mode);
0311 
0312 err_activate:
0313     dev_err(&client->dev, "failed to change sensor range\n");
0314     stk8312_set_mode(data, mode);
0315 
0316     return ret;
0317 }
0318 
0319 static int stk8312_read_accel(struct stk8312_data *data, u8 address)
0320 {
0321     int ret;
0322     struct i2c_client *client = data->client;
0323 
0324     if (address > 2)
0325         return -EINVAL;
0326 
0327     ret = i2c_smbus_read_byte_data(client, address);
0328     if (ret < 0)
0329         dev_err(&client->dev, "register read failed\n");
0330 
0331     return ret;
0332 }
0333 
0334 static int stk8312_read_raw(struct iio_dev *indio_dev,
0335                 struct iio_chan_spec const *chan,
0336                 int *val, int *val2, long mask)
0337 {
0338     struct stk8312_data *data = iio_priv(indio_dev);
0339     int ret;
0340 
0341     switch (mask) {
0342     case IIO_CHAN_INFO_RAW:
0343         if (iio_buffer_enabled(indio_dev))
0344             return -EBUSY;
0345         mutex_lock(&data->lock);
0346         ret = stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
0347         if (ret < 0) {
0348             mutex_unlock(&data->lock);
0349             return ret;
0350         }
0351         ret = stk8312_read_accel(data, chan->address);
0352         if (ret < 0) {
0353             stk8312_set_mode(data,
0354                      data->mode & (~STK8312_MODE_ACTIVE));
0355             mutex_unlock(&data->lock);
0356             return ret;
0357         }
0358         *val = sign_extend32(ret, chan->scan_type.realbits - 1);
0359         ret = stk8312_set_mode(data,
0360                        data->mode & (~STK8312_MODE_ACTIVE));
0361         mutex_unlock(&data->lock);
0362         if (ret < 0)
0363             return ret;
0364         return IIO_VAL_INT;
0365     case IIO_CHAN_INFO_SCALE:
0366         *val = stk8312_scale_table[data->range - 1][0];
0367         *val2 = stk8312_scale_table[data->range - 1][1];
0368         return IIO_VAL_INT_PLUS_MICRO;
0369     case IIO_CHAN_INFO_SAMP_FREQ:
0370         *val = stk8312_samp_freq_table[data->sample_rate_idx].val;
0371         *val2 = stk8312_samp_freq_table[data->sample_rate_idx].val2;
0372         return IIO_VAL_INT_PLUS_MICRO;
0373     }
0374 
0375     return -EINVAL;
0376 }
0377 
0378 static int stk8312_write_raw(struct iio_dev *indio_dev,
0379                  struct iio_chan_spec const *chan,
0380                  int val, int val2, long mask)
0381 {
0382     int i;
0383     int index = -1;
0384     int ret;
0385     struct stk8312_data *data = iio_priv(indio_dev);
0386 
0387     switch (mask) {
0388     case IIO_CHAN_INFO_SCALE:
0389         for (i = 0; i < ARRAY_SIZE(stk8312_scale_table); i++)
0390             if (val == stk8312_scale_table[i][0] &&
0391                 val2 == stk8312_scale_table[i][1]) {
0392                 index = i + 1;
0393                 break;
0394             }
0395         if (index < 0)
0396             return -EINVAL;
0397 
0398         mutex_lock(&data->lock);
0399         ret = stk8312_set_range(data, index);
0400         mutex_unlock(&data->lock);
0401 
0402         return ret;
0403     case IIO_CHAN_INFO_SAMP_FREQ:
0404         for (i = 0; i < ARRAY_SIZE(stk8312_samp_freq_table); i++)
0405             if (val == stk8312_samp_freq_table[i].val &&
0406                 val2 == stk8312_samp_freq_table[i].val2) {
0407                 index = i;
0408                 break;
0409             }
0410         if (index < 0)
0411             return -EINVAL;
0412         mutex_lock(&data->lock);
0413         ret = stk8312_set_sample_rate(data, index);
0414         mutex_unlock(&data->lock);
0415 
0416         return ret;
0417     }
0418 
0419     return -EINVAL;
0420 }
0421 
0422 static const struct iio_info stk8312_info = {
0423     .read_raw       = stk8312_read_raw,
0424     .write_raw      = stk8312_write_raw,
0425     .attrs          = &stk8312_attribute_group,
0426 };
0427 
0428 static irqreturn_t stk8312_trigger_handler(int irq, void *p)
0429 {
0430     struct iio_poll_func *pf = p;
0431     struct iio_dev *indio_dev = pf->indio_dev;
0432     struct stk8312_data *data = iio_priv(indio_dev);
0433     int bit, ret, i = 0;
0434 
0435     mutex_lock(&data->lock);
0436     /*
0437      * Do a bulk read if all channels are requested,
0438      * from 0x00 (XOUT) to 0x02 (ZOUT)
0439      */
0440     if (*(indio_dev->active_scan_mask) == STK8312_ALL_CHANNEL_MASK) {
0441         ret = i2c_smbus_read_i2c_block_data(data->client,
0442                             STK8312_REG_XOUT,
0443                             STK8312_ALL_CHANNEL_SIZE,
0444                             data->scan.chans);
0445         if (ret < STK8312_ALL_CHANNEL_SIZE) {
0446             dev_err(&data->client->dev, "register read failed\n");
0447             mutex_unlock(&data->lock);
0448             goto err;
0449         }
0450     } else {
0451         for_each_set_bit(bit, indio_dev->active_scan_mask,
0452                  indio_dev->masklength) {
0453             ret = stk8312_read_accel(data, bit);
0454             if (ret < 0) {
0455                 mutex_unlock(&data->lock);
0456                 goto err;
0457             }
0458             data->scan.chans[i++] = ret;
0459         }
0460     }
0461     mutex_unlock(&data->lock);
0462 
0463     iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
0464                        pf->timestamp);
0465 err:
0466     iio_trigger_notify_done(indio_dev->trig);
0467 
0468     return IRQ_HANDLED;
0469 }
0470 
0471 static irqreturn_t stk8312_data_rdy_trig_poll(int irq, void *private)
0472 {
0473     struct iio_dev *indio_dev = private;
0474     struct stk8312_data *data = iio_priv(indio_dev);
0475 
0476     if (data->dready_trigger_on)
0477         iio_trigger_poll(data->dready_trig);
0478 
0479     return IRQ_HANDLED;
0480 }
0481 
0482 static int stk8312_buffer_preenable(struct iio_dev *indio_dev)
0483 {
0484     struct stk8312_data *data = iio_priv(indio_dev);
0485 
0486     return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
0487 }
0488 
0489 static int stk8312_buffer_postdisable(struct iio_dev *indio_dev)
0490 {
0491     struct stk8312_data *data = iio_priv(indio_dev);
0492 
0493     return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
0494 }
0495 
0496 static const struct iio_buffer_setup_ops stk8312_buffer_setup_ops = {
0497     .preenable   = stk8312_buffer_preenable,
0498     .postdisable = stk8312_buffer_postdisable,
0499 };
0500 
0501 static int stk8312_probe(struct i2c_client *client,
0502              const struct i2c_device_id *id)
0503 {
0504     int ret;
0505     struct iio_dev *indio_dev;
0506     struct stk8312_data *data;
0507 
0508     indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
0509     if (!indio_dev) {
0510         dev_err(&client->dev, "iio allocation failed!\n");
0511         return -ENOMEM;
0512     }
0513 
0514     data = iio_priv(indio_dev);
0515     data->client = client;
0516     i2c_set_clientdata(client, indio_dev);
0517     mutex_init(&data->lock);
0518 
0519     indio_dev->info = &stk8312_info;
0520     indio_dev->name = STK8312_DRIVER_NAME;
0521     indio_dev->modes = INDIO_DIRECT_MODE;
0522     indio_dev->channels = stk8312_channels;
0523     indio_dev->num_channels = ARRAY_SIZE(stk8312_channels);
0524 
0525     /* A software reset is recommended at power-on */
0526     ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_RESET, 0x00);
0527     if (ret < 0) {
0528         dev_err(&client->dev, "failed to reset sensor\n");
0529         return ret;
0530     }
0531     data->sample_rate_idx = STK8312_SR_400HZ_IDX;
0532     ret = stk8312_set_range(data, STK8312_RNG_6G);
0533     if (ret < 0)
0534         return ret;
0535 
0536     ret = stk8312_set_mode(data,
0537                    STK8312_MODE_INT_AH_PP | STK8312_MODE_ACTIVE);
0538     if (ret < 0)
0539         return ret;
0540 
0541     if (client->irq > 0) {
0542         ret = devm_request_threaded_irq(&client->dev, client->irq,
0543                         stk8312_data_rdy_trig_poll,
0544                         NULL,
0545                         IRQF_TRIGGER_RISING |
0546                         IRQF_ONESHOT,
0547                         STK8312_IRQ_NAME,
0548                         indio_dev);
0549         if (ret < 0) {
0550             dev_err(&client->dev, "request irq %d failed\n",
0551                 client->irq);
0552             goto err_power_off;
0553         }
0554 
0555         data->dready_trig = devm_iio_trigger_alloc(&client->dev,
0556                                "%s-dev%d",
0557                                indio_dev->name,
0558                                iio_device_id(indio_dev));
0559         if (!data->dready_trig) {
0560             ret = -ENOMEM;
0561             goto err_power_off;
0562         }
0563 
0564         data->dready_trig->ops = &stk8312_trigger_ops;
0565         iio_trigger_set_drvdata(data->dready_trig, indio_dev);
0566         ret = iio_trigger_register(data->dready_trig);
0567         if (ret) {
0568             dev_err(&client->dev, "iio trigger register failed\n");
0569             goto err_power_off;
0570         }
0571     }
0572 
0573     ret = iio_triggered_buffer_setup(indio_dev,
0574                      iio_pollfunc_store_time,
0575                      stk8312_trigger_handler,
0576                      &stk8312_buffer_setup_ops);
0577     if (ret < 0) {
0578         dev_err(&client->dev, "iio triggered buffer setup failed\n");
0579         goto err_trigger_unregister;
0580     }
0581 
0582     ret = iio_device_register(indio_dev);
0583     if (ret < 0) {
0584         dev_err(&client->dev, "device_register failed\n");
0585         goto err_buffer_cleanup;
0586     }
0587 
0588     return 0;
0589 
0590 err_buffer_cleanup:
0591     iio_triggered_buffer_cleanup(indio_dev);
0592 err_trigger_unregister:
0593     if (data->dready_trig)
0594         iio_trigger_unregister(data->dready_trig);
0595 err_power_off:
0596     stk8312_set_mode(data, STK8312_MODE_STANDBY);
0597     return ret;
0598 }
0599 
0600 static int stk8312_remove(struct i2c_client *client)
0601 {
0602     struct iio_dev *indio_dev = i2c_get_clientdata(client);
0603     struct stk8312_data *data = iio_priv(indio_dev);
0604 
0605     iio_device_unregister(indio_dev);
0606     iio_triggered_buffer_cleanup(indio_dev);
0607 
0608     if (data->dready_trig)
0609         iio_trigger_unregister(data->dready_trig);
0610 
0611     stk8312_set_mode(data, STK8312_MODE_STANDBY);
0612 
0613     return 0;
0614 }
0615 
0616 static int stk8312_suspend(struct device *dev)
0617 {
0618     struct stk8312_data *data;
0619 
0620     data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
0621 
0622     return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
0623 }
0624 
0625 static int stk8312_resume(struct device *dev)
0626 {
0627     struct stk8312_data *data;
0628 
0629     data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
0630 
0631     return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
0632 }
0633 
0634 static DEFINE_SIMPLE_DEV_PM_OPS(stk8312_pm_ops, stk8312_suspend,
0635                 stk8312_resume);
0636 
0637 static const struct i2c_device_id stk8312_i2c_id[] = {
0638     /* Deprecated in favour of lowercase form */
0639     { "STK8312", 0 },
0640     { "stk8312", 0 },
0641     {}
0642 };
0643 MODULE_DEVICE_TABLE(i2c, stk8312_i2c_id);
0644 
0645 static struct i2c_driver stk8312_driver = {
0646     .driver = {
0647         .name = STK8312_DRIVER_NAME,
0648         .pm = pm_sleep_ptr(&stk8312_pm_ops),
0649     },
0650     .probe =            stk8312_probe,
0651     .remove =           stk8312_remove,
0652     .id_table =         stk8312_i2c_id,
0653 };
0654 
0655 module_i2c_driver(stk8312_driver);
0656 
0657 MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
0658 MODULE_DESCRIPTION("STK8312 3-Axis Accelerometer driver");
0659 MODULE_LICENSE("GPL v2");
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