2 * bma180.c - IIO driver for Bosch BMA180 triaxial acceleration sensor
4 * Copyright 2013 Oleksandr Kravchenko <x0199363@ti.com>
6 * Support for BMA250 (c) Peter Meerwald <pmeerw@pmeerw.net>
8 * This file is subject to the terms and conditions of version 2 of
9 * the GNU General Public License. See the file COPYING in the main
10 * directory of this archive for more details.
12 * SPI is not supported by driver
13 * BMA180: 7-bit I2C slave address 0x40 or 0x41
14 * BMA250: 7-bit I2C slave address 0x18 or 0x19
17 #include <linux/module.h>
18 #include <linux/i2c.h>
19 #include <linux/interrupt.h>
20 #include <linux/delay.h>
22 #include <linux/bitops.h>
23 #include <linux/slab.h>
24 #include <linux/string.h>
25 #include <linux/iio/iio.h>
26 #include <linux/iio/sysfs.h>
27 #include <linux/iio/buffer.h>
28 #include <linux/iio/trigger.h>
29 #include <linux/iio/trigger_consumer.h>
30 #include <linux/iio/triggered_buffer.h>
32 #define BMA180_DRV_NAME "bma180"
33 #define BMA180_IRQ_NAME "bma180_event"
42 struct bma180_part_info {
43 const struct iio_chan_spec *channels;
44 unsigned num_channels;
45 const int *scale_table;
50 u8 int_reset_reg, int_reset_mask;
51 u8 sleep_reg, sleep_mask;
52 u8 bw_reg, bw_mask, bw_offset;
53 u8 scale_reg, scale_mask;
54 u8 power_reg, power_mask, lowpower_val;
55 u8 int_enable_reg, int_enable_mask;
58 int (*chip_config)(struct bma180_data *data);
59 void (*chip_disable)(struct bma180_data *data);
63 #define BMA180_CHIP_ID 0x00 /* Need to distinguish BMA180 from other */
64 #define BMA180_ACC_X_LSB 0x02 /* First of 6 registers of accel data */
65 #define BMA180_TEMP 0x08
66 #define BMA180_CTRL_REG0 0x0d
67 #define BMA180_RESET 0x10
68 #define BMA180_BW_TCS 0x20
69 #define BMA180_CTRL_REG3 0x21
70 #define BMA180_TCO_Z 0x30
71 #define BMA180_OFFSET_LSB1 0x35
73 /* BMA180_CTRL_REG0 bits */
74 #define BMA180_DIS_WAKE_UP BIT(0) /* Disable wake up mode */
75 #define BMA180_SLEEP BIT(1) /* 1 - chip will sleep */
76 #define BMA180_EE_W BIT(4) /* Unlock writing to addr from 0x20 */
77 #define BMA180_RESET_INT BIT(6) /* Reset pending interrupts */
79 /* BMA180_CTRL_REG3 bits */
80 #define BMA180_NEW_DATA_INT BIT(1) /* Intr every new accel data is ready */
82 /* BMA180_OFFSET_LSB1 skipping mode bit */
83 #define BMA180_SMP_SKIP BIT(0)
85 /* Bit masks for registers bit fields */
86 #define BMA180_RANGE 0x0e /* Range of measured accel values */
87 #define BMA180_BW 0xf0 /* Accel bandwidth */
88 #define BMA180_MODE_CONFIG 0x03 /* Config operation modes */
90 /* We have to write this value in reset register to do soft reset */
91 #define BMA180_RESET_VAL 0xb6
93 #define BMA180_ID_REG_VAL 0x03
95 /* Chip power modes */
96 #define BMA180_LOW_POWER 0x03
98 #define BMA250_RANGE_REG 0x0f
99 #define BMA250_BW_REG 0x10
100 #define BMA250_POWER_REG 0x11
101 #define BMA250_RESET_REG 0x14
102 #define BMA250_INT_ENABLE_REG 0x17
103 #define BMA250_INT_MAP_REG 0x1a
104 #define BMA250_INT_RESET_REG 0x21
106 #define BMA250_RANGE_MASK GENMASK(3, 0) /* Range of accel values */
107 #define BMA250_BW_MASK GENMASK(4, 0) /* Accel bandwidth */
108 #define BMA250_BW_OFFSET 8
109 #define BMA250_SUSPEND_MASK BIT(7) /* chip will sleep */
110 #define BMA250_LOWPOWER_MASK BIT(6)
111 #define BMA250_DATA_INTEN_MASK BIT(4)
112 #define BMA250_INT1_DATA_MASK BIT(0)
113 #define BMA250_INT_RESET_MASK BIT(7) /* Reset pending interrupts */
116 struct i2c_client *client;
117 struct iio_trigger *trig;
118 const struct bma180_part_info *part_info;
124 /* Ensure timestamp is naturally aligned */
127 s64 timestamp __aligned(8);
138 static int bma180_bw_table[] = { 10, 20, 40, 75, 150, 300 }; /* Hz */
139 static int bma180_scale_table[] = { 1275, 1863, 2452, 3727, 4903, 9709, 19417 };
141 static int bma250_bw_table[] = { 8, 16, 31, 63, 125, 250 }; /* Hz */
142 static int bma250_scale_table[] = { 0, 0, 0, 38344, 0, 76590, 0, 0, 153180, 0,
145 static int bma180_get_data_reg(struct bma180_data *data, enum bma180_chan chan)
149 if (data->sleep_state)
154 ret = i2c_smbus_read_byte_data(data->client, BMA180_TEMP);
156 dev_err(&data->client->dev, "failed to read temp register\n");
159 ret = i2c_smbus_read_word_data(data->client,
160 BMA180_ACC_X_LSB + chan * 2);
162 dev_err(&data->client->dev,
163 "failed to read accel_%c register\n",
170 static int bma180_set_bits(struct bma180_data *data, u8 reg, u8 mask, u8 val)
172 int ret = i2c_smbus_read_byte_data(data->client, reg);
173 u8 reg_val = (ret & ~mask) | (val << (ffs(mask) - 1));
178 return i2c_smbus_write_byte_data(data->client, reg, reg_val);
181 static int bma180_reset_intr(struct bma180_data *data)
183 int ret = bma180_set_bits(data, data->part_info->int_reset_reg,
184 data->part_info->int_reset_mask, 1);
187 dev_err(&data->client->dev, "failed to reset interrupt\n");
192 static int bma180_set_new_data_intr_state(struct bma180_data *data, bool state)
194 int ret = bma180_set_bits(data, data->part_info->int_enable_reg,
195 data->part_info->int_enable_mask, state);
198 ret = bma180_reset_intr(data);
205 dev_err(&data->client->dev,
206 "failed to set new data interrupt state %d\n", state);
210 static int bma180_set_sleep_state(struct bma180_data *data, bool state)
212 int ret = bma180_set_bits(data, data->part_info->sleep_reg,
213 data->part_info->sleep_mask, state);
216 dev_err(&data->client->dev,
217 "failed to set sleep state %d\n", state);
220 data->sleep_state = state;
225 static int bma180_set_ee_writing_state(struct bma180_data *data, bool state)
227 int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_EE_W, state);
230 dev_err(&data->client->dev,
231 "failed to set ee writing state %d\n", state);
236 static int bma180_set_bw(struct bma180_data *data, int val)
240 if (data->sleep_state)
243 for (i = 0; i < data->part_info->num_bw; ++i) {
244 if (data->part_info->bw_table[i] == val) {
245 ret = bma180_set_bits(data, data->part_info->bw_reg,
246 data->part_info->bw_mask,
247 i + data->part_info->bw_offset);
249 dev_err(&data->client->dev,
250 "failed to set bandwidth\n");
261 static int bma180_set_scale(struct bma180_data *data, int val)
265 if (data->sleep_state)
268 for (i = 0; i < data->part_info->num_scales; ++i)
269 if (data->part_info->scale_table[i] == val) {
270 ret = bma180_set_bits(data, data->part_info->scale_reg,
271 data->part_info->scale_mask, i);
273 dev_err(&data->client->dev,
274 "failed to set scale\n");
284 static int bma180_set_pmode(struct bma180_data *data, bool mode)
286 u8 reg_val = mode ? data->part_info->lowpower_val : 0;
287 int ret = bma180_set_bits(data, data->part_info->power_reg,
288 data->part_info->power_mask, reg_val);
291 dev_err(&data->client->dev, "failed to set power mode\n");
299 static int bma180_soft_reset(struct bma180_data *data)
301 int ret = i2c_smbus_write_byte_data(data->client,
302 data->part_info->softreset_reg, BMA180_RESET_VAL);
305 dev_err(&data->client->dev, "failed to reset the chip\n");
310 static int bma180_chip_init(struct bma180_data *data)
312 /* Try to read chip_id register. It must return 0x03. */
313 int ret = i2c_smbus_read_byte_data(data->client, BMA180_CHIP_ID);
317 if (ret != BMA180_ID_REG_VAL)
320 ret = bma180_soft_reset(data);
324 * No serial transaction should occur within minimum 10 us
325 * after soft_reset command
329 ret = bma180_set_new_data_intr_state(data, false);
333 return bma180_set_pmode(data, false);
336 static int bma180_chip_config(struct bma180_data *data)
338 int ret = bma180_chip_init(data);
342 ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_DIS_WAKE_UP, 1);
345 ret = bma180_set_ee_writing_state(data, true);
348 ret = bma180_set_bits(data, BMA180_OFFSET_LSB1, BMA180_SMP_SKIP, 1);
351 ret = bma180_set_bw(data, 20); /* 20 Hz */
354 ret = bma180_set_scale(data, 2452); /* 2 G */
361 dev_err(&data->client->dev, "failed to config the chip\n");
365 static int bma250_chip_config(struct bma180_data *data)
367 int ret = bma180_chip_init(data);
371 ret = bma180_set_bw(data, 16); /* 16 Hz */
374 ret = bma180_set_scale(data, 38344); /* 2 G */
377 ret = bma180_set_bits(data, BMA250_INT_MAP_REG,
378 BMA250_INT1_DATA_MASK, 1);
385 dev_err(&data->client->dev, "failed to config the chip\n");
389 static void bma180_chip_disable(struct bma180_data *data)
391 if (bma180_set_new_data_intr_state(data, false))
393 if (bma180_set_ee_writing_state(data, false))
395 if (bma180_set_sleep_state(data, true))
401 dev_err(&data->client->dev, "failed to disable the chip\n");
404 static void bma250_chip_disable(struct bma180_data *data)
406 if (bma180_set_new_data_intr_state(data, false))
408 if (bma180_set_sleep_state(data, true))
414 dev_err(&data->client->dev, "failed to disable the chip\n");
417 static ssize_t bma180_show_avail(char *buf, const int *vals, unsigned n,
423 for (i = 0; i < n; i++) {
426 len += scnprintf(buf + len, PAGE_SIZE - len,
427 micros ? "0.%06d " : "%d ", vals[i]);
434 static ssize_t bma180_show_filter_freq_avail(struct device *dev,
435 struct device_attribute *attr, char *buf)
437 struct bma180_data *data = iio_priv(dev_to_iio_dev(dev));
439 return bma180_show_avail(buf, data->part_info->bw_table,
440 data->part_info->num_bw, false);
443 static ssize_t bma180_show_scale_avail(struct device *dev,
444 struct device_attribute *attr, char *buf)
446 struct bma180_data *data = iio_priv(dev_to_iio_dev(dev));
448 return bma180_show_avail(buf, data->part_info->scale_table,
449 data->part_info->num_scales, true);
452 static IIO_DEVICE_ATTR(in_accel_filter_low_pass_3db_frequency_available,
453 S_IRUGO, bma180_show_filter_freq_avail, NULL, 0);
455 static IIO_DEVICE_ATTR(in_accel_scale_available,
456 S_IRUGO, bma180_show_scale_avail, NULL, 0);
458 static struct attribute *bma180_attributes[] = {
459 &iio_dev_attr_in_accel_filter_low_pass_3db_frequency_available.
461 &iio_dev_attr_in_accel_scale_available.dev_attr.attr,
465 static const struct attribute_group bma180_attrs_group = {
466 .attrs = bma180_attributes,
469 static int bma180_read_raw(struct iio_dev *indio_dev,
470 struct iio_chan_spec const *chan, int *val, int *val2,
473 struct bma180_data *data = iio_priv(indio_dev);
477 case IIO_CHAN_INFO_RAW:
478 mutex_lock(&data->mutex);
479 if (iio_buffer_enabled(indio_dev)) {
480 mutex_unlock(&data->mutex);
483 ret = bma180_get_data_reg(data, chan->scan_index);
484 mutex_unlock(&data->mutex);
487 *val = sign_extend32(ret >> chan->scan_type.shift,
488 chan->scan_type.realbits - 1);
490 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
493 case IIO_CHAN_INFO_SCALE:
494 switch (chan->type) {
498 return IIO_VAL_INT_PLUS_MICRO;
505 case IIO_CHAN_INFO_OFFSET:
506 *val = 48; /* 0 LSB @ 24 degree C */
513 static int bma180_write_raw(struct iio_dev *indio_dev,
514 struct iio_chan_spec const *chan, int val, int val2, long mask)
516 struct bma180_data *data = iio_priv(indio_dev);
520 case IIO_CHAN_INFO_SCALE:
523 mutex_lock(&data->mutex);
524 ret = bma180_set_scale(data, val2);
525 mutex_unlock(&data->mutex);
527 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
530 mutex_lock(&data->mutex);
531 ret = bma180_set_bw(data, val);
532 mutex_unlock(&data->mutex);
539 static const struct iio_info bma180_info = {
540 .attrs = &bma180_attrs_group,
541 .read_raw = bma180_read_raw,
542 .write_raw = bma180_write_raw,
543 .driver_module = THIS_MODULE,
546 static const char * const bma180_power_modes[] = { "low_noise", "low_power" };
548 static int bma180_get_power_mode(struct iio_dev *indio_dev,
549 const struct iio_chan_spec *chan)
551 struct bma180_data *data = iio_priv(indio_dev);
556 static int bma180_set_power_mode(struct iio_dev *indio_dev,
557 const struct iio_chan_spec *chan, unsigned int mode)
559 struct bma180_data *data = iio_priv(indio_dev);
562 mutex_lock(&data->mutex);
563 ret = bma180_set_pmode(data, mode);
564 mutex_unlock(&data->mutex);
569 static const struct iio_enum bma180_power_mode_enum = {
570 .items = bma180_power_modes,
571 .num_items = ARRAY_SIZE(bma180_power_modes),
572 .get = bma180_get_power_mode,
573 .set = bma180_set_power_mode,
576 static const struct iio_chan_spec_ext_info bma180_ext_info[] = {
577 IIO_ENUM("power_mode", true, &bma180_power_mode_enum),
578 IIO_ENUM_AVAILABLE("power_mode", &bma180_power_mode_enum),
582 #define BMA180_ACC_CHANNEL(_axis, _bits) { \
585 .channel2 = IIO_MOD_##_axis, \
586 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
587 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
588 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \
589 .scan_index = AXIS_##_axis, \
594 .shift = 16 - _bits, \
596 .ext_info = bma180_ext_info, \
599 #define BMA180_TEMP_CHANNEL { \
601 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
602 BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_OFFSET), \
603 .scan_index = TEMP, \
611 static const struct iio_chan_spec bma180_channels[] = {
612 BMA180_ACC_CHANNEL(X, 14),
613 BMA180_ACC_CHANNEL(Y, 14),
614 BMA180_ACC_CHANNEL(Z, 14),
616 IIO_CHAN_SOFT_TIMESTAMP(4),
619 static const struct iio_chan_spec bma250_channels[] = {
620 BMA180_ACC_CHANNEL(X, 10),
621 BMA180_ACC_CHANNEL(Y, 10),
622 BMA180_ACC_CHANNEL(Z, 10),
624 IIO_CHAN_SOFT_TIMESTAMP(4),
627 static const struct bma180_part_info bma180_part_info[] = {
629 .channels = bma180_channels,
630 .num_channels = ARRAY_SIZE(bma180_channels),
631 .scale_table = bma180_scale_table,
632 .num_scales = ARRAY_SIZE(bma180_scale_table),
633 .bw_table = bma180_bw_table,
634 .num_bw = ARRAY_SIZE(bma180_bw_table),
635 .int_reset_reg = BMA180_CTRL_REG0,
636 .int_reset_mask = BMA180_RESET_INT,
637 .sleep_reg = BMA180_CTRL_REG0,
638 .sleep_mask = BMA180_SLEEP,
639 .bw_reg = BMA180_BW_TCS,
640 .bw_mask = BMA180_BW,
641 .scale_reg = BMA180_OFFSET_LSB1,
642 .scale_mask = BMA180_RANGE,
643 .power_reg = BMA180_TCO_Z,
644 .power_mask = BMA180_MODE_CONFIG,
645 .lowpower_val = BMA180_LOW_POWER,
646 .int_enable_reg = BMA180_CTRL_REG3,
647 .int_enable_mask = BMA180_NEW_DATA_INT,
648 .softreset_reg = BMA180_RESET,
649 .chip_config = bma180_chip_config,
650 .chip_disable = bma180_chip_disable,
653 .channels = bma250_channels,
654 .num_channels = ARRAY_SIZE(bma250_channels),
655 .scale_table = bma250_scale_table,
656 .num_scales = ARRAY_SIZE(bma250_scale_table),
657 .bw_table = bma250_bw_table,
658 .num_bw = ARRAY_SIZE(bma250_bw_table),
659 .int_reset_reg = BMA250_INT_RESET_REG,
660 .int_reset_mask = BMA250_INT_RESET_MASK,
661 .sleep_reg = BMA250_POWER_REG,
662 .sleep_mask = BMA250_SUSPEND_MASK,
663 .bw_reg = BMA250_BW_REG,
664 .bw_mask = BMA250_BW_MASK,
665 .bw_offset = BMA250_BW_OFFSET,
666 .scale_reg = BMA250_RANGE_REG,
667 .scale_mask = BMA250_RANGE_MASK,
668 .power_reg = BMA250_POWER_REG,
669 .power_mask = BMA250_LOWPOWER_MASK,
671 .int_enable_reg = BMA250_INT_ENABLE_REG,
672 .int_enable_mask = BMA250_DATA_INTEN_MASK,
673 .softreset_reg = BMA250_RESET_REG,
674 .chip_config = bma250_chip_config,
675 .chip_disable = bma250_chip_disable,
679 static irqreturn_t bma180_trigger_handler(int irq, void *p)
681 struct iio_poll_func *pf = p;
682 struct iio_dev *indio_dev = pf->indio_dev;
683 struct bma180_data *data = iio_priv(indio_dev);
684 int64_t time_ns = iio_get_time_ns();
687 mutex_lock(&data->mutex);
689 for_each_set_bit(bit, indio_dev->active_scan_mask,
690 indio_dev->masklength) {
691 ret = bma180_get_data_reg(data, bit);
693 mutex_unlock(&data->mutex);
696 data->scan.chan[i++] = ret;
699 mutex_unlock(&data->mutex);
701 iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, time_ns);
703 iio_trigger_notify_done(indio_dev->trig);
708 static int bma180_data_rdy_trigger_set_state(struct iio_trigger *trig,
711 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
712 struct bma180_data *data = iio_priv(indio_dev);
714 return bma180_set_new_data_intr_state(data, state);
717 static int bma180_trig_try_reen(struct iio_trigger *trig)
719 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
720 struct bma180_data *data = iio_priv(indio_dev);
722 return bma180_reset_intr(data);
725 static const struct iio_trigger_ops bma180_trigger_ops = {
726 .set_trigger_state = bma180_data_rdy_trigger_set_state,
727 .try_reenable = bma180_trig_try_reen,
728 .owner = THIS_MODULE,
731 static int bma180_probe(struct i2c_client *client,
732 const struct i2c_device_id *id)
734 struct bma180_data *data;
735 struct iio_dev *indio_dev;
738 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
742 data = iio_priv(indio_dev);
743 i2c_set_clientdata(client, indio_dev);
744 data->client = client;
745 data->part_info = &bma180_part_info[id->driver_data];
747 ret = data->part_info->chip_config(data);
749 goto err_chip_disable;
751 mutex_init(&data->mutex);
752 indio_dev->dev.parent = &client->dev;
753 indio_dev->channels = data->part_info->channels;
754 indio_dev->num_channels = data->part_info->num_channels;
755 indio_dev->name = id->name;
756 indio_dev->modes = INDIO_DIRECT_MODE;
757 indio_dev->info = &bma180_info;
759 if (client->irq > 0) {
760 data->trig = iio_trigger_alloc("%s-dev%d", indio_dev->name,
764 goto err_chip_disable;
767 ret = devm_request_irq(&client->dev, client->irq,
768 iio_trigger_generic_data_rdy_poll, IRQF_TRIGGER_RISING,
769 "bma180_event", data->trig);
771 dev_err(&client->dev, "unable to request IRQ\n");
772 goto err_trigger_free;
775 data->trig->dev.parent = &client->dev;
776 data->trig->ops = &bma180_trigger_ops;
777 iio_trigger_set_drvdata(data->trig, indio_dev);
778 indio_dev->trig = iio_trigger_get(data->trig);
780 ret = iio_trigger_register(data->trig);
782 goto err_trigger_free;
785 ret = iio_triggered_buffer_setup(indio_dev, NULL,
786 bma180_trigger_handler, NULL);
788 dev_err(&client->dev, "unable to setup iio triggered buffer\n");
789 goto err_trigger_unregister;
792 ret = iio_device_register(indio_dev);
794 dev_err(&client->dev, "unable to register iio device\n");
795 goto err_buffer_cleanup;
801 iio_triggered_buffer_cleanup(indio_dev);
802 err_trigger_unregister:
804 iio_trigger_unregister(data->trig);
806 iio_trigger_free(data->trig);
808 data->part_info->chip_disable(data);
813 static int bma180_remove(struct i2c_client *client)
815 struct iio_dev *indio_dev = i2c_get_clientdata(client);
816 struct bma180_data *data = iio_priv(indio_dev);
818 iio_device_unregister(indio_dev);
819 iio_triggered_buffer_cleanup(indio_dev);
821 iio_trigger_unregister(data->trig);
822 iio_trigger_free(data->trig);
825 mutex_lock(&data->mutex);
826 data->part_info->chip_disable(data);
827 mutex_unlock(&data->mutex);
832 #ifdef CONFIG_PM_SLEEP
833 static int bma180_suspend(struct device *dev)
835 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
836 struct bma180_data *data = iio_priv(indio_dev);
839 mutex_lock(&data->mutex);
840 ret = bma180_set_sleep_state(data, true);
841 mutex_unlock(&data->mutex);
846 static int bma180_resume(struct device *dev)
848 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
849 struct bma180_data *data = iio_priv(indio_dev);
852 mutex_lock(&data->mutex);
853 ret = bma180_set_sleep_state(data, false);
854 mutex_unlock(&data->mutex);
859 static SIMPLE_DEV_PM_OPS(bma180_pm_ops, bma180_suspend, bma180_resume);
860 #define BMA180_PM_OPS (&bma180_pm_ops)
862 #define BMA180_PM_OPS NULL
865 static struct i2c_device_id bma180_ids[] = {
866 { "bma180", BMA180 },
867 { "bma250", BMA250 },
871 MODULE_DEVICE_TABLE(i2c, bma180_ids);
873 static struct i2c_driver bma180_driver = {
878 .probe = bma180_probe,
879 .remove = bma180_remove,
880 .id_table = bma180_ids,
883 module_i2c_driver(bma180_driver);
885 MODULE_AUTHOR("Kravchenko Oleksandr <x0199363@ti.com>");
886 MODULE_AUTHOR("Texas Instruments, Inc.");
887 MODULE_DESCRIPTION("Bosch BMA180/BMA250 triaxial acceleration sensor");
888 MODULE_LICENSE("GPL");