1 // SPDX-License-Identifier: GPL-2.0-only
3 * BM1390 ROHM pressure sensor
5 * Copyright (c) 2023, ROHM Semiconductor.
6 * https://fscdn.rohm.com/en/products/databook/datasheet/ic/sensor/pressure/bm1390glv-z-e.pdf
9 #include <linux/bitfield.h>
10 #include <linux/bits.h>
11 #include <linux/device.h>
12 #include <linux/i2c.h>
13 #include <linux/module.h>
14 #include <linux/regmap.h>
15 #include <linux/regulator/consumer.h>
17 #include <linux/iio/iio.h>
18 #include <linux/iio/trigger.h>
19 #include <linux/iio/trigger_consumer.h>
20 #include <linux/iio/triggered_buffer.h>
22 #define BM1390_REG_MANUFACT_ID 0x0f
23 #define BM1390_REG_PART_ID 0x10
24 #define BM1390_REG_POWER 0x12
25 #define BM1390_MASK_POWER BIT(0)
26 #define BM1390_POWER_ON BM1390_MASK_POWER
27 #define BM1390_POWER_OFF 0x00
28 #define BM1390_REG_RESET 0x13
29 #define BM1390_MASK_RESET BIT(0)
30 #define BM1390_RESET_RELEASE BM1390_MASK_RESET
31 #define BM1390_RESET 0x00
32 #define BM1390_REG_MODE_CTRL 0x14
33 #define BM1390_MASK_MEAS_MODE GENMASK(1, 0)
34 #define BM1390_MASK_DRDY_EN BIT(4)
35 #define BM1390_MASK_WMI_EN BIT(2)
36 #define BM1390_MASK_AVE_NUM GENMASK(7, 5)
39 * Data-sheet states that when the IIR is used, the AVE_NUM must be set to
42 #define BM1390_IIR_AVE_NUM 0x06
43 #define BM1390_REG_FIFO_CTRL 0x15
44 #define BM1390_MASK_IIR_MODE GENMASK(1, 0)
45 #define BM1390_IIR_MODE_OFF 0x0
46 #define BM1390_IIR_MODE_WEAK 0x1
47 #define BM1390_IIR_MODE_MID 0x2
48 #define BM1390_IIR_MODE_STRONG 0x3
50 #define BM1390_MASK_FIFO_LEN BIT(6)
51 #define BM1390_MASK_FIFO_EN BIT(7)
52 #define BM1390_WMI_MIN 2
53 #define BM1390_WMI_MAX 3
55 #define BM1390_REG_FIFO_LVL 0x18
56 #define BM1390_MASK_FIFO_LVL GENMASK(2, 0)
57 #define BM1390_REG_STATUS 0x19
58 #define BM1390_REG_PRESSURE_BASE 0x1a
59 #define BM1390_REG_TEMP_HI 0x1d
60 #define BM1390_REG_TEMP_LO 0x1e
61 #define BM1390_MAX_REGISTER BM1390_REG_TEMP_LO
63 #define BM1390_ID 0x34
66 static const struct regmap_range bm1390_volatile_ranges[] = {
68 .range_min = BM1390_REG_STATUS,
69 .range_max = BM1390_REG_STATUS,
72 .range_min = BM1390_REG_FIFO_LVL,
73 .range_max = BM1390_REG_TEMP_LO,
77 static const struct regmap_access_table bm1390_volatile_regs = {
78 .yes_ranges = &bm1390_volatile_ranges[0],
79 .n_yes_ranges = ARRAY_SIZE(bm1390_volatile_ranges),
82 static const struct regmap_range bm1390_precious_ranges[] = {
84 .range_min = BM1390_REG_STATUS,
85 .range_max = BM1390_REG_STATUS,
89 static const struct regmap_access_table bm1390_precious_regs = {
90 .yes_ranges = &bm1390_precious_ranges[0],
91 .n_yes_ranges = ARRAY_SIZE(bm1390_precious_ranges),
94 static const struct regmap_range bm1390_read_only_ranges[] = {
96 .range_min = BM1390_REG_MANUFACT_ID,
97 .range_max = BM1390_REG_PART_ID,
99 .range_min = BM1390_REG_FIFO_LVL,
100 .range_max = BM1390_REG_TEMP_LO,
104 static const struct regmap_access_table bm1390_ro_regs = {
105 .no_ranges = &bm1390_read_only_ranges[0],
106 .n_no_ranges = ARRAY_SIZE(bm1390_read_only_ranges),
109 static const struct regmap_range bm1390_noinc_read_ranges[] = {
111 .range_min = BM1390_REG_PRESSURE_BASE,
112 .range_max = BM1390_REG_TEMP_LO,
116 static const struct regmap_access_table bm1390_nir_regs = {
117 .yes_ranges = &bm1390_noinc_read_ranges[0],
118 .n_yes_ranges = ARRAY_SIZE(bm1390_noinc_read_ranges),
121 static const struct regmap_config bm1390_regmap = {
124 .volatile_table = &bm1390_volatile_regs,
125 .wr_table = &bm1390_ro_regs,
126 .rd_noinc_table = &bm1390_nir_regs,
127 .precious_table = &bm1390_precious_regs,
128 .max_register = BM1390_MAX_REGISTER,
129 .cache_type = REGCACHE_RBTREE,
130 .disable_locking = true,
138 struct bm1390_data_buf {
144 /* BM1390 has FIFO for 4 pressure samples */
145 #define BM1390_FIFO_LENGTH 4
148 s64 timestamp, old_timestamp;
149 struct iio_trigger *trig;
150 struct regmap *regmap;
152 struct bm1390_data_buf buf;
155 bool trigger_enabled;
158 /* Prevent accessing sensor during FIFO read sequence */
163 BM1390_CHAN_PRESSURE,
167 static const struct iio_chan_spec bm1390_channels[] = {
169 .type = IIO_PRESSURE,
170 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
172 * When IIR is used, we must fix amount of averaged samples.
173 * Thus we don't allow setting oversampling ratio.
175 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
176 .scan_index = BM1390_CHAN_PRESSURE,
181 .endianness = IIO_LE,
186 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
187 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
188 .scan_index = BM1390_CHAN_TEMP,
193 .endianness = IIO_BE,
196 IIO_CHAN_SOFT_TIMESTAMP(2),
200 * We can't skip reading the pressure because the watermark IRQ is acked
201 * only when the pressure data is read from the FIFO.
203 static const unsigned long bm1390_scan_masks[] = {
204 BIT(BM1390_CHAN_PRESSURE),
205 BIT(BM1390_CHAN_PRESSURE) | BIT(BM1390_CHAN_TEMP),
209 static int bm1390_read_temp(struct bm1390_data *data, int *temp)
214 ret = regmap_bulk_read(data->regmap, BM1390_REG_TEMP_HI, &temp_raw,
219 *temp = be16_to_cpu(temp_raw);
224 static int bm1390_pressure_read(struct bm1390_data *data, u32 *pressure)
226 /* Pressure data is in 3 8-bit registers */
230 ret = regmap_bulk_read(data->regmap, BM1390_REG_PRESSURE_BASE,
235 *pressure = (u32)(raw[2] >> 2 | raw[1] << 6 | raw[0] << 14);
240 /* The enum values map directly to register bits */
241 enum bm1390_meas_mode {
242 BM1390_MEAS_MODE_STOP = 0x0,
243 BM1390_MEAS_MODE_1SHOT = 0x1,
244 BM1390_MEAS_MODE_CONTINUOUS = 0x2,
247 static int bm1390_meas_set(struct bm1390_data *data, enum bm1390_meas_mode mode)
249 return regmap_update_bits(data->regmap, BM1390_REG_MODE_CTRL,
250 BM1390_MASK_MEAS_MODE, mode);
254 * If the trigger is not used we just wait until the measurement has
255 * completed. The data-sheet says maximum measurement cycle (regardless
256 * the AVE_NUM) is 200 mS so let's just sleep at least that long. If speed
257 * is needed the trigger should be used.
259 #define BM1390_MAX_MEAS_TIME_MS 205
261 static int bm1390_read_data(struct bm1390_data *data,
262 struct iio_chan_spec const *chan, int *val, int *val2)
266 mutex_lock(&data->mutex);
268 * We use 'continuous mode' even for raw read because according to the
269 * data-sheet an one-shot mode can't be used with IIR filter.
271 ret = bm1390_meas_set(data, BM1390_MEAS_MODE_CONTINUOUS);
275 switch (chan->type) {
277 msleep(BM1390_MAX_MEAS_TIME_MS);
278 ret = bm1390_pressure_read(data, val);
281 msleep(BM1390_MAX_MEAS_TIME_MS);
282 ret = bm1390_read_temp(data, val);
287 warn = bm1390_meas_set(data, BM1390_MEAS_MODE_STOP);
289 dev_warn(data->dev, "Failed to stop measurement (%d)\n", warn);
291 mutex_unlock(&data->mutex);
296 static int bm1390_read_raw(struct iio_dev *idev,
297 struct iio_chan_spec const *chan,
298 int *val, int *val2, long mask)
300 struct bm1390_data *data = iio_priv(idev);
304 case IIO_CHAN_INFO_SCALE:
305 if (chan->type == IIO_TEMP) {
309 return IIO_VAL_INT_PLUS_MICRO;
310 } else if (chan->type == IIO_PRESSURE) {
312 * pressure in hPa is register value divided by 2048.
313 * This means kPa is 1/20480 times the register value,
318 return IIO_VAL_FRACTIONAL;
322 case IIO_CHAN_INFO_RAW:
323 ret = iio_device_claim_direct_mode(idev);
327 ret = bm1390_read_data(data, chan, val, val2);
328 iio_device_release_direct_mode(idev);
338 static int __bm1390_fifo_flush(struct iio_dev *idev, unsigned int samples,
341 /* BM1390_FIFO_LENGTH is small so we shouldn't run out of stack */
342 struct bm1390_data_buf buffer[BM1390_FIFO_LENGTH];
343 struct bm1390_data *data = iio_priv(idev);
344 int smp_lvl, ret, i, warn, dummy;
348 ret = regmap_read(data->regmap, BM1390_REG_FIFO_LVL, &smp_lvl);
352 smp_lvl = FIELD_GET(BM1390_MASK_FIFO_LVL, smp_lvl);
356 if (smp_lvl > BM1390_FIFO_LENGTH) {
358 * The fifo holds maximum of 4 samples so valid values
359 * should be 0, 1, 2, 3, 4 - rest are probably bit errors
360 * in I2C line. Don't overflow if this happens.
362 dev_err(data->dev, "bad FIFO level %d\n", smp_lvl);
363 smp_lvl = BM1390_FIFO_LENGTH;
366 sample_period = timestamp - data->old_timestamp;
367 do_div(sample_period, smp_lvl);
369 if (samples && smp_lvl > samples)
374 * After some testing it appears that the temperature is not readable
375 * until the FIFO access has been done after the WMI. Thus, we need
376 * to read the all pressure values to memory and read the temperature
379 for (i = 0; i < smp_lvl; i++) {
381 * When we start reading data from the FIFO the sensor goes to
382 * special FIFO reading mode. If any other register is accessed
383 * during the FIFO read, samples can be dropped. Prevent access
384 * until FIFO_LVL is read. We have mutex locked and we do also
385 * go performing reading of FIFO_LVL even if this read fails.
387 if (test_bit(BM1390_CHAN_PRESSURE, idev->active_scan_mask)) {
388 ret = bm1390_pressure_read(data, &buffer[i].pressure);
394 * Old timestamp is either the previous sample IRQ time,
395 * previous flush-time or, if this was first sample, the enable
396 * time. When we add a sample period to that we should get the
397 * best approximation of the time-stamp we are handling.
399 * Idea is to always keep the "old_timestamp" matching the
400 * timestamp which we are currently handling.
402 data->old_timestamp += sample_period;
403 buffer[i].ts = data->old_timestamp;
405 /* Reading the FIFO_LVL closes the FIFO access sequence */
406 warn = regmap_read(data->regmap, BM1390_REG_FIFO_LVL, &dummy);
408 dev_warn(data->dev, "Closing FIFO sequence failed\n");
413 if (test_bit(BM1390_CHAN_TEMP, idev->active_scan_mask)) {
414 ret = regmap_bulk_read(data->regmap, BM1390_REG_TEMP_HI, &temp,
423 for (i = 0; i < smp_lvl; i++) {
424 buffer[i].temp = temp;
425 iio_push_to_buffers(idev, &buffer[i]);
431 static int bm1390_fifo_flush(struct iio_dev *idev, unsigned int samples)
433 struct bm1390_data *data = iio_priv(idev);
438 * If fifo_flush is being called from IRQ handler we know the stored
439 * timestamp is fairly accurate for the last stored sample. If we are
440 * called as a result of a read operation from userspace and hence
441 * before the watermark interrupt was triggered, take a timestamp
442 * now. We can fall anywhere in between two samples so the error in this
443 * case is at most one sample period.
444 * We need to have the IRQ disabled or we risk of messing-up
445 * the timestamps. If we are ran from IRQ, then the
446 * IRQF_ONESHOT has us covered - but if we are ran by the
447 * user-space read we need to disable the IRQ to be on a safe
448 * side. We do this usng synchronous disable so that if the
449 * IRQ thread is being ran on other CPU we wait for it to be
453 timestamp = iio_get_time_ns(idev);
454 mutex_lock(&data->mutex);
455 ret = __bm1390_fifo_flush(idev, samples, timestamp);
456 mutex_unlock(&data->mutex);
461 static int bm1390_set_watermark(struct iio_dev *idev, unsigned int val)
463 struct bm1390_data *data = iio_priv(idev);
465 if (val < BM1390_WMI_MIN || val > BM1390_WMI_MAX)
468 mutex_lock(&data->mutex);
469 data->watermark = val;
470 mutex_unlock(&data->mutex);
475 static const struct iio_info bm1390_noirq_info = {
476 .read_raw = &bm1390_read_raw,
479 static const struct iio_info bm1390_info = {
480 .read_raw = &bm1390_read_raw,
481 .hwfifo_set_watermark = bm1390_set_watermark,
482 .hwfifo_flush_to_buffer = bm1390_fifo_flush,
485 static int bm1390_chip_init(struct bm1390_data *data)
489 ret = regmap_write_bits(data->regmap, BM1390_REG_POWER,
490 BM1390_MASK_POWER, BM1390_POWER_ON);
496 ret = regmap_write_bits(data->regmap, BM1390_REG_RESET,
497 BM1390_MASK_RESET, BM1390_RESET);
503 ret = regmap_write_bits(data->regmap, BM1390_REG_RESET,
504 BM1390_MASK_RESET, BM1390_RESET_RELEASE);
510 ret = regmap_reinit_cache(data->regmap, &bm1390_regmap);
512 dev_err(data->dev, "Failed to reinit reg cache\n");
517 * Default to use IIR filter in "middle" mode. Also the AVE_NUM must
518 * be fixed when IIR is in use.
520 ret = regmap_update_bits(data->regmap, BM1390_REG_MODE_CTRL,
521 BM1390_MASK_AVE_NUM, BM1390_IIR_AVE_NUM);
525 return regmap_update_bits(data->regmap, BM1390_REG_FIFO_CTRL,
526 BM1390_MASK_IIR_MODE, BM1390_IIR_MODE_MID);
529 static int bm1390_fifo_set_wmi(struct bm1390_data *data)
533 regval = FIELD_PREP(BM1390_MASK_FIFO_LEN,
534 data->watermark - BM1390_WMI_MIN);
536 return regmap_update_bits(data->regmap, BM1390_REG_FIFO_CTRL,
537 BM1390_MASK_FIFO_LEN, regval);
540 static int bm1390_fifo_enable(struct iio_dev *idev)
542 struct bm1390_data *data = iio_priv(idev);
545 /* We can't do buffered stuff without IRQ as we never get WMI */
549 mutex_lock(&data->mutex);
550 if (data->trigger_enabled) {
555 /* Update watermark to HW */
556 ret = bm1390_fifo_set_wmi(data);
561 ret = regmap_set_bits(data->regmap, BM1390_REG_MODE_CTRL,
567 ret = regmap_set_bits(data->regmap, BM1390_REG_FIFO_CTRL,
568 BM1390_MASK_FIFO_EN);
572 data->state = BM1390_STATE_FIFO;
574 data->old_timestamp = iio_get_time_ns(idev);
575 ret = bm1390_meas_set(data, BM1390_MEAS_MODE_CONTINUOUS);
578 mutex_unlock(&data->mutex);
583 static int bm1390_fifo_disable(struct iio_dev *idev)
585 struct bm1390_data *data = iio_priv(idev);
590 mutex_lock(&data->mutex);
591 ret = bm1390_meas_set(data, BM1390_MEAS_MODE_STOP);
596 ret = regmap_clear_bits(data->regmap, BM1390_REG_FIFO_CTRL,
597 BM1390_MASK_FIFO_EN);
601 data->state = BM1390_STATE_SAMPLE;
603 /* Disable WMI_IRQ */
604 ret = regmap_clear_bits(data->regmap, BM1390_REG_MODE_CTRL,
608 mutex_unlock(&data->mutex);
613 static int bm1390_buffer_postenable(struct iio_dev *idev)
616 * If we use data-ready trigger, then the IRQ masks should be handled by
617 * trigger enable and the hardware buffer is not used but we just update
618 * results to the IIO FIFO when data-ready triggers.
620 if (iio_device_get_current_mode(idev) == INDIO_BUFFER_TRIGGERED)
623 return bm1390_fifo_enable(idev);
626 static int bm1390_buffer_predisable(struct iio_dev *idev)
628 if (iio_device_get_current_mode(idev) == INDIO_BUFFER_TRIGGERED)
631 return bm1390_fifo_disable(idev);
634 static const struct iio_buffer_setup_ops bm1390_buffer_ops = {
635 .postenable = bm1390_buffer_postenable,
636 .predisable = bm1390_buffer_predisable,
639 static irqreturn_t bm1390_trigger_handler(int irq, void *p)
641 struct iio_poll_func *pf = p;
642 struct iio_dev *idev = pf->indio_dev;
643 struct bm1390_data *data = iio_priv(idev);
646 /* DRDY is acked by reading status reg */
647 ret = regmap_read(data->regmap, BM1390_REG_STATUS, &status);
651 dev_dbg(data->dev, "DRDY trig status 0x%x\n", status);
653 if (test_bit(BM1390_CHAN_PRESSURE, idev->active_scan_mask)) {
654 ret = bm1390_pressure_read(data, &data->buf.pressure);
656 dev_warn(data->dev, "sample read failed %d\n", ret);
661 if (test_bit(BM1390_CHAN_TEMP, idev->active_scan_mask)) {
662 ret = regmap_bulk_read(data->regmap, BM1390_REG_TEMP_HI,
663 &data->buf.temp, sizeof(data->buf.temp));
665 dev_warn(data->dev, "temp read failed %d\n", ret);
670 iio_push_to_buffers_with_timestamp(idev, &data->buf, data->timestamp);
671 iio_trigger_notify_done(idev->trig);
676 /* Get timestamps and wake the thread if we need to read data */
677 static irqreturn_t bm1390_irq_handler(int irq, void *private)
679 struct iio_dev *idev = private;
680 struct bm1390_data *data = iio_priv(idev);
682 data->timestamp = iio_get_time_ns(idev);
684 if (data->state == BM1390_STATE_FIFO || data->trigger_enabled)
685 return IRQ_WAKE_THREAD;
690 static irqreturn_t bm1390_irq_thread_handler(int irq, void *private)
692 struct iio_dev *idev = private;
693 struct bm1390_data *data = iio_priv(idev);
696 mutex_lock(&data->mutex);
698 if (data->trigger_enabled) {
699 iio_trigger_poll_nested(data->trig);
701 } else if (data->state == BM1390_STATE_FIFO) {
704 ok = __bm1390_fifo_flush(idev, BM1390_FIFO_LENGTH,
710 mutex_unlock(&data->mutex);
715 static int bm1390_set_drdy_irq(struct bm1390_data *data, bool en)
718 return regmap_set_bits(data->regmap, BM1390_REG_MODE_CTRL,
719 BM1390_MASK_DRDY_EN);
720 return regmap_clear_bits(data->regmap, BM1390_REG_MODE_CTRL,
721 BM1390_MASK_DRDY_EN);
724 static int bm1390_trigger_set_state(struct iio_trigger *trig,
727 struct bm1390_data *data = iio_trigger_get_drvdata(trig);
730 mutex_lock(&data->mutex);
732 if (data->trigger_enabled == state)
735 if (data->state == BM1390_STATE_FIFO) {
736 dev_warn(data->dev, "Can't set trigger when FIFO enabled\n");
741 data->trigger_enabled = state;
744 ret = bm1390_meas_set(data, BM1390_MEAS_MODE_CONTINUOUS);
750 ret = bm1390_meas_set(data, BM1390_MEAS_MODE_STOP);
755 * We need to read the status register in order to ACK the
756 * data-ready which may have been generated just before we
757 * disabled the measurement.
759 ret = regmap_read(data->regmap, BM1390_REG_STATUS, &dummy);
761 dev_warn(data->dev, "status read failed\n");
764 ret = bm1390_set_drdy_irq(data, state);
767 mutex_unlock(&data->mutex);
772 static const struct iio_trigger_ops bm1390_trigger_ops = {
773 .set_trigger_state = bm1390_trigger_set_state,
776 static int bm1390_setup_buffer(struct bm1390_data *data, struct iio_dev *idev)
780 ret = devm_iio_triggered_buffer_setup(data->dev, idev,
781 &iio_pollfunc_store_time,
782 &bm1390_trigger_handler,
786 return dev_err_probe(data->dev, ret,
787 "iio_triggered_buffer_setup FAIL\n");
789 idev->available_scan_masks = bm1390_scan_masks;
794 static int bm1390_setup_trigger(struct bm1390_data *data, struct iio_dev *idev,
797 struct iio_trigger *itrig;
801 itrig = devm_iio_trigger_alloc(data->dev, "%sdata-rdy-dev%d", idev->name,
802 iio_device_id(idev));
808 itrig->ops = &bm1390_trigger_ops;
809 iio_trigger_set_drvdata(itrig, data);
811 name = devm_kasprintf(data->dev, GFP_KERNEL, "%s-bm1390",
812 dev_name(data->dev));
816 ret = devm_request_threaded_irq(data->dev, irq, bm1390_irq_handler,
817 &bm1390_irq_thread_handler,
818 IRQF_ONESHOT, name, idev);
820 return dev_err_probe(data->dev, ret, "Could not request IRQ\n");
823 ret = devm_iio_trigger_register(data->dev, itrig);
825 return dev_err_probe(data->dev, ret,
826 "Trigger registration failed\n");
831 static int bm1390_probe(struct i2c_client *i2c)
833 struct bm1390_data *data;
834 struct regmap *regmap;
835 struct iio_dev *idev;
837 unsigned int part_id;
842 regmap = devm_regmap_init_i2c(i2c, &bm1390_regmap);
844 return dev_err_probe(dev, PTR_ERR(regmap),
845 "Failed to initialize Regmap\n");
847 ret = devm_regulator_get_enable(dev, "vdd");
849 return dev_err_probe(dev, ret, "Failed to get regulator\n");
851 ret = regmap_read(regmap, BM1390_REG_PART_ID, &part_id);
853 return dev_err_probe(dev, ret, "Failed to access sensor\n");
855 if (part_id != BM1390_ID)
856 dev_warn(dev, "unknown device 0x%x\n", part_id);
858 idev = devm_iio_device_alloc(dev, sizeof(*data));
862 data = iio_priv(idev);
863 data->regmap = regmap;
865 data->irq = i2c->irq;
867 * For now we just allow BM1390_WMI_MIN to BM1390_WMI_MAX and
868 * discard every other configuration when triggered mode is not used.
870 data->watermark = BM1390_WMI_MAX;
871 mutex_init(&data->mutex);
873 idev->channels = bm1390_channels;
874 idev->num_channels = ARRAY_SIZE(bm1390_channels);
875 idev->name = "bm1390";
876 idev->modes = INDIO_DIRECT_MODE;
878 ret = bm1390_chip_init(data);
880 return dev_err_probe(dev, ret, "sensor init failed\n");
882 ret = bm1390_setup_buffer(data, idev);
886 /* No trigger if we don't have IRQ for data-ready and WMI */
888 idev->info = &bm1390_info;
889 idev->modes |= INDIO_BUFFER_SOFTWARE;
890 ret = bm1390_setup_trigger(data, idev, i2c->irq);
894 idev->info = &bm1390_noirq_info;
897 ret = devm_iio_device_register(dev, idev);
899 return dev_err_probe(dev, ret,
900 "Unable to register iio device\n");
905 static const struct of_device_id bm1390_of_match[] = {
906 { .compatible = "rohm,bm1390glv-z" },
909 MODULE_DEVICE_TABLE(of, bm1390_of_match);
911 static const struct i2c_device_id bm1390_id[] = {
915 MODULE_DEVICE_TABLE(i2c, bm1390_id);
917 static struct i2c_driver bm1390_driver = {
920 .of_match_table = bm1390_of_match,
922 * Probing explicitly requires a few millisecond of sleep.
923 * Enabling the VDD regulator may include ramp up rates.
925 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
927 .probe = bm1390_probe,
928 .id_table = bm1390_id,
930 module_i2c_driver(bm1390_driver);
932 MODULE_AUTHOR("Matti Vaittinen <mazziesaccount@gmail.com>");
933 MODULE_DESCRIPTION("Driver for ROHM BM1390 pressure sensor");
934 MODULE_LICENSE("GPL");