2 * bma180.c - IIO driver for Bosch BMA180 triaxial acceleration sensor
4 * Copyright 2013 Oleksandr Kravchenko <x0199363@ti.com>
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.
11 #include <linux/module.h>
12 #include <linux/i2c.h>
13 #include <linux/interrupt.h>
14 #include <linux/delay.h>
16 #include <linux/bitops.h>
17 #include <linux/slab.h>
18 #include <linux/string.h>
19 #include <linux/iio/iio.h>
20 #include <linux/iio/sysfs.h>
21 #include <linux/iio/buffer.h>
22 #include <linux/iio/trigger.h>
23 #include <linux/iio/trigger_consumer.h>
24 #include <linux/iio/triggered_buffer.h>
26 #define BMA180_DRV_NAME "bma180"
27 #define BMA180_IRQ_NAME "bma180_event"
30 #define BMA180_CHIP_ID 0x00 /* Need to distinguish BMA180 from other */
31 #define BMA180_ACC_X_LSB 0x02 /* First of 6 registers of accel data */
32 #define BMA180_CTRL_REG0 0x0d
33 #define BMA180_RESET 0x10
34 #define BMA180_BW_TCS 0x20
35 #define BMA180_CTRL_REG3 0x21
36 #define BMA180_TCO_Z 0x30
37 #define BMA180_OFFSET_LSB1 0x35
39 /* BMA180_CTRL_REG0 bits */
40 #define BMA180_DIS_WAKE_UP BIT(0) /* Disable wake up mode */
41 #define BMA180_SLEEP BIT(1) /* 1 - chip will sleep */
42 #define BMA180_EE_W BIT(4) /* Unlock writing to addr from 0x20 */
43 #define BMA180_RESET_INT BIT(6) /* Reset pending interrupts */
45 /* BMA180_CTRL_REG3 bits */
46 #define BMA180_NEW_DATA_INT BIT(1) /* Intr every new accel data is ready */
48 /* BMA180_OFFSET_LSB1 skipping mode bit */
49 #define BMA180_SMP_SKIP BIT(0)
51 /* Bit masks for registers bit fields */
52 #define BMA180_RANGE 0x0e /* Range of measured accel values */
53 #define BMA180_BW 0xf0 /* Accel bandwidth */
54 #define BMA180_MODE_CONFIG 0x03 /* Config operation modes */
56 /* We have to write this value in reset register to do soft reset */
57 #define BMA180_RESET_VAL 0xb6
59 #define BMA180_ID_REG_VAL 0x03
61 /* Chip power modes */
62 #define BMA180_LOW_NOISE 0x00
63 #define BMA180_LOW_POWER 0x03
66 #define BMA180_DEF_PMODE false
67 #define BMA180_DEF_BW 20
68 #define BMA180_DEF_SCALE 2452
70 /* Available values for sysfs */
71 #define BMA180_FLP_FREQ_AVAILABLE \
73 #define BMA180_SCALE_AVAILABLE \
74 "0.001275 0.001863 0.002452 0.003727 0.004903 0.009709 0.019417"
77 struct i2c_client *client;
78 struct iio_trigger *trig;
93 static int bma180_bw_table[] = { 10, 20, 40, 75, 150, 300 }; /* Hz */
94 static int bma180_scale_table[] = { 1275, 1863, 2452, 3727, 4903, 9709, 19417 };
96 static int bma180_get_acc_reg(struct bma180_data *data, enum bma180_axis axis)
98 u8 reg = BMA180_ACC_X_LSB + axis * 2;
101 if (data->sleep_state)
104 ret = i2c_smbus_read_word_data(data->client, reg);
106 dev_err(&data->client->dev,
107 "failed to read accel_%c register\n", 'x' + axis);
112 static int bma180_set_bits(struct bma180_data *data, u8 reg, u8 mask, u8 val)
114 int ret = i2c_smbus_read_byte_data(data->client, reg);
115 u8 reg_val = (ret & ~mask) | (val << (ffs(mask) - 1));
120 return i2c_smbus_write_byte_data(data->client, reg, reg_val);
123 static int bma180_reset_intr(struct bma180_data *data)
125 int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_RESET_INT, 1);
128 dev_err(&data->client->dev, "failed to reset interrupt\n");
133 static int bma180_set_new_data_intr_state(struct bma180_data *data, bool state)
135 u8 reg_val = state ? BMA180_NEW_DATA_INT : 0x00;
136 int ret = i2c_smbus_write_byte_data(data->client, BMA180_CTRL_REG3,
141 ret = bma180_reset_intr(data);
148 dev_err(&data->client->dev,
149 "failed to set new data interrupt state %d\n", state);
153 static int bma180_set_sleep_state(struct bma180_data *data, bool state)
155 int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_SLEEP, state);
158 dev_err(&data->client->dev,
159 "failed to set sleep state %d\n", state);
162 data->sleep_state = state;
167 static int bma180_set_ee_writing_state(struct bma180_data *data, bool state)
169 int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_EE_W, state);
172 dev_err(&data->client->dev,
173 "failed to set ee writing state %d\n", state);
178 static int bma180_set_bw(struct bma180_data *data, int val)
182 if (data->sleep_state)
185 for (i = 0; i < ARRAY_SIZE(bma180_bw_table); ++i) {
186 if (bma180_bw_table[i] == val) {
187 ret = bma180_set_bits(data,
188 BMA180_BW_TCS, BMA180_BW, i);
190 dev_err(&data->client->dev,
191 "failed to set bandwidth\n");
202 static int bma180_set_scale(struct bma180_data *data, int val)
206 if (data->sleep_state)
209 for (i = 0; i < ARRAY_SIZE(bma180_scale_table); ++i)
210 if (bma180_scale_table[i] == val) {
211 ret = bma180_set_bits(data,
212 BMA180_OFFSET_LSB1, BMA180_RANGE, i);
214 dev_err(&data->client->dev,
215 "failed to set scale\n");
225 static int bma180_set_pmode(struct bma180_data *data, bool mode)
227 u8 reg_val = mode ? BMA180_LOW_POWER : BMA180_LOW_NOISE;
228 int ret = bma180_set_bits(data, BMA180_TCO_Z, BMA180_MODE_CONFIG,
232 dev_err(&data->client->dev, "failed to set power mode\n");
240 static int bma180_soft_reset(struct bma180_data *data)
242 int ret = i2c_smbus_write_byte_data(data->client,
243 BMA180_RESET, BMA180_RESET_VAL);
246 dev_err(&data->client->dev, "failed to reset the chip\n");
251 static int bma180_chip_init(struct bma180_data *data)
253 /* Try to read chip_id register. It must return 0x03. */
254 int ret = i2c_smbus_read_byte_data(data->client, BMA180_CHIP_ID);
258 if (ret != BMA180_ID_REG_VAL) {
263 ret = bma180_soft_reset(data);
267 * No serial transaction should occur within minimum 10 us
268 * after soft_reset command
272 ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_DIS_WAKE_UP, 1);
275 ret = bma180_set_ee_writing_state(data, true);
278 ret = bma180_set_new_data_intr_state(data, false);
281 ret = bma180_set_bits(data, BMA180_OFFSET_LSB1, BMA180_SMP_SKIP, 1);
284 ret = bma180_set_pmode(data, BMA180_DEF_PMODE);
287 ret = bma180_set_bw(data, BMA180_DEF_BW);
290 ret = bma180_set_scale(data, BMA180_DEF_SCALE);
297 dev_err(&data->client->dev, "failed to init the chip\n");
301 static void bma180_chip_disable(struct bma180_data *data)
303 if (bma180_set_new_data_intr_state(data, false))
305 if (bma180_set_ee_writing_state(data, false))
307 if (bma180_set_sleep_state(data, true))
313 dev_err(&data->client->dev, "failed to disable the chip\n");
316 static IIO_CONST_ATTR(in_accel_filter_low_pass_3db_frequency_available,
317 BMA180_FLP_FREQ_AVAILABLE);
318 static IIO_CONST_ATTR(in_accel_scale_available, BMA180_SCALE_AVAILABLE);
320 static struct attribute *bma180_attributes[] = {
321 &iio_const_attr_in_accel_filter_low_pass_3db_frequency_available.dev_attr.attr,
322 &iio_const_attr_in_accel_scale_available.dev_attr.attr,
326 static const struct attribute_group bma180_attrs_group = {
327 .attrs = bma180_attributes,
330 static int bma180_read_raw(struct iio_dev *indio_dev,
331 struct iio_chan_spec const *chan, int *val, int *val2,
334 struct bma180_data *data = iio_priv(indio_dev);
338 case IIO_CHAN_INFO_RAW:
339 mutex_lock(&data->mutex);
340 if (iio_buffer_enabled(indio_dev))
343 ret = bma180_get_acc_reg(data, chan->scan_index);
344 mutex_unlock(&data->mutex);
347 *val = (s16)ret >> chan->scan_type.shift;
349 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
352 case IIO_CHAN_INFO_SCALE:
355 return IIO_VAL_INT_PLUS_MICRO;
361 static int bma180_write_raw(struct iio_dev *indio_dev,
362 struct iio_chan_spec const *chan, int val, int val2, long mask)
364 struct bma180_data *data = iio_priv(indio_dev);
368 case IIO_CHAN_INFO_SCALE:
371 mutex_lock(&data->mutex);
372 ret = bma180_set_scale(data, val2);
373 mutex_unlock(&data->mutex);
375 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
378 mutex_lock(&data->mutex);
379 ret = bma180_set_bw(data, val);
380 mutex_unlock(&data->mutex);
387 static int bma180_update_scan_mode(struct iio_dev *indio_dev,
388 const unsigned long *scan_mask)
390 struct bma180_data *data = iio_priv(indio_dev);
393 devm_kfree(&indio_dev->dev, data->buff);
394 data->buff = devm_kzalloc(&indio_dev->dev,
395 indio_dev->scan_bytes, GFP_KERNEL);
402 static const struct iio_info bma180_info = {
403 .attrs = &bma180_attrs_group,
404 .read_raw = bma180_read_raw,
405 .write_raw = bma180_write_raw,
406 .update_scan_mode = bma180_update_scan_mode,
407 .driver_module = THIS_MODULE,
410 static const char * const bma180_power_modes[] = { "low_noise", "low_power" };
412 static int bma180_get_power_mode(struct iio_dev *indio_dev,
413 const struct iio_chan_spec *chan)
415 struct bma180_data *data = iio_priv(indio_dev);
420 static int bma180_set_power_mode(struct iio_dev *indio_dev,
421 const struct iio_chan_spec *chan, unsigned int mode)
423 struct bma180_data *data = iio_priv(indio_dev);
426 mutex_lock(&data->mutex);
427 ret = bma180_set_pmode(data, mode);
428 mutex_unlock(&data->mutex);
433 static const struct iio_enum bma180_power_mode_enum = {
434 .items = bma180_power_modes,
435 .num_items = ARRAY_SIZE(bma180_power_modes),
436 .get = bma180_get_power_mode,
437 .set = bma180_set_power_mode,
440 static const struct iio_chan_spec_ext_info bma180_ext_info[] = {
441 IIO_ENUM("power_mode", true, &bma180_power_mode_enum),
442 IIO_ENUM_AVAILABLE("power_mode", &bma180_power_mode_enum),
446 #define BMA180_CHANNEL(_axis) { \
449 .channel2 = IIO_MOD_##_axis, \
450 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
451 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
452 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \
453 .scan_index = AXIS_##_axis, \
460 .ext_info = bma180_ext_info, \
463 static const struct iio_chan_spec bma180_channels[] = {
467 IIO_CHAN_SOFT_TIMESTAMP(3),
470 static irqreturn_t bma180_trigger_handler(int irq, void *p)
472 struct iio_poll_func *pf = p;
473 struct iio_dev *indio_dev = pf->indio_dev;
474 struct bma180_data *data = iio_priv(indio_dev);
475 int64_t time_ns = iio_get_time_ns();
478 mutex_lock(&data->mutex);
480 for_each_set_bit(bit, indio_dev->buffer->scan_mask,
481 indio_dev->masklength) {
482 ret = bma180_get_acc_reg(data, bit);
484 mutex_unlock(&data->mutex);
487 ((s16 *)data->buff)[i++] = ret;
489 mutex_unlock(&data->mutex);
491 iio_push_to_buffers_with_timestamp(indio_dev, data->buff, time_ns);
493 iio_trigger_notify_done(indio_dev->trig);
498 static int bma180_data_rdy_trigger_set_state(struct iio_trigger *trig,
501 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
502 struct bma180_data *data = iio_priv(indio_dev);
504 return bma180_set_new_data_intr_state(data, state);
507 static int bma180_trig_try_reen(struct iio_trigger *trig)
509 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
510 struct bma180_data *data = iio_priv(indio_dev);
512 return bma180_reset_intr(data);
515 static const struct iio_trigger_ops bma180_trigger_ops = {
516 .set_trigger_state = bma180_data_rdy_trigger_set_state,
517 .try_reenable = bma180_trig_try_reen,
518 .owner = THIS_MODULE,
521 static int bma180_probe(struct i2c_client *client,
522 const struct i2c_device_id *id)
524 struct bma180_data *data;
525 struct iio_dev *indio_dev;
528 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
532 data = iio_priv(indio_dev);
533 i2c_set_clientdata(client, indio_dev);
534 data->client = client;
536 ret = bma180_chip_init(data);
538 goto err_chip_disable;
540 mutex_init(&data->mutex);
542 indio_dev->dev.parent = &client->dev;
543 indio_dev->channels = bma180_channels;
544 indio_dev->num_channels = ARRAY_SIZE(bma180_channels);
545 indio_dev->name = BMA180_DRV_NAME;
546 indio_dev->modes = INDIO_DIRECT_MODE;
547 indio_dev->info = &bma180_info;
549 if (client->irq > 0) {
550 data->trig = iio_trigger_alloc("%s-dev%d", indio_dev->name,
554 goto err_chip_disable;
557 ret = devm_request_irq(&client->dev, client->irq,
558 iio_trigger_generic_data_rdy_poll, IRQF_TRIGGER_RISING,
559 BMA180_IRQ_NAME, data->trig);
561 dev_err(&client->dev, "unable to request IRQ\n");
562 goto err_trigger_free;
565 data->trig->dev.parent = &client->dev;
566 data->trig->ops = &bma180_trigger_ops;
567 iio_trigger_set_drvdata(data->trig, indio_dev);
568 indio_dev->trig = data->trig;
570 ret = iio_trigger_register(data->trig);
572 goto err_trigger_free;
575 ret = iio_triggered_buffer_setup(indio_dev, NULL,
576 bma180_trigger_handler, NULL);
578 dev_err(&client->dev, "unable to setup iio triggered buffer\n");
579 goto err_trigger_unregister;
582 ret = iio_device_register(indio_dev);
584 dev_err(&client->dev, "unable to register iio device\n");
585 goto err_buffer_cleanup;
591 iio_triggered_buffer_cleanup(indio_dev);
592 err_trigger_unregister:
594 iio_trigger_unregister(data->trig);
596 iio_trigger_free(data->trig);
598 bma180_chip_disable(data);
603 static int bma180_remove(struct i2c_client *client)
605 struct iio_dev *indio_dev = i2c_get_clientdata(client);
606 struct bma180_data *data = iio_priv(indio_dev);
608 iio_device_unregister(indio_dev);
609 iio_triggered_buffer_cleanup(indio_dev);
611 iio_trigger_unregister(data->trig);
612 iio_trigger_free(data->trig);
615 mutex_lock(&data->mutex);
616 bma180_chip_disable(data);
617 mutex_unlock(&data->mutex);
622 #ifdef CONFIG_PM_SLEEP
623 static int bma180_suspend(struct device *dev)
625 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
626 struct bma180_data *data = iio_priv(indio_dev);
629 mutex_lock(&data->mutex);
630 ret = bma180_set_sleep_state(data, true);
631 mutex_unlock(&data->mutex);
636 static int bma180_resume(struct device *dev)
638 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
639 struct bma180_data *data = iio_priv(indio_dev);
642 mutex_lock(&data->mutex);
643 ret = bma180_set_sleep_state(data, false);
644 mutex_unlock(&data->mutex);
649 static SIMPLE_DEV_PM_OPS(bma180_pm_ops, bma180_suspend, bma180_resume);
650 #define BMA180_PM_OPS (&bma180_pm_ops)
652 #define BMA180_PM_OPS NULL
655 static struct i2c_device_id bma180_id[] = {
656 { BMA180_DRV_NAME, 0 },
660 MODULE_DEVICE_TABLE(i2c, bma180_id);
662 static struct i2c_driver bma180_driver = {
664 .name = BMA180_DRV_NAME,
665 .owner = THIS_MODULE,
668 .probe = bma180_probe,
669 .remove = bma180_remove,
670 .id_table = bma180_id,
673 module_i2c_driver(bma180_driver);
675 MODULE_AUTHOR("Kravchenko Oleksandr <x0199363@ti.com>");
676 MODULE_AUTHOR("Texas Instruments, Inc.");
677 MODULE_DESCRIPTION("Bosch BMA180 triaxial acceleration sensor");
678 MODULE_LICENSE("GPL");