2 * Copyright (c) 2010 Christoph Mair <christoph.mair@gmail.com>
3 * Copyright (c) 2012 Bosch Sensortec GmbH
4 * Copyright (c) 2012 Unixphere AB
5 * Copyright (c) 2014 Intel Corporation
6 * Copyright (c) 2016 Linus Walleij <linus.walleij@linaro.org>
8 * Driver for Bosch Sensortec BMP180 and BMP280 digital pressure sensor.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 * https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BMP180-DS000-121.pdf
16 * https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BMP280-DS001-12.pdf
17 * https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BME280_DS001-11.pdf
20 #define pr_fmt(fmt) "bmp280: " fmt
22 #include <linux/device.h>
23 #include <linux/module.h>
24 #include <linux/regmap.h>
25 #include <linux/delay.h>
26 #include <linux/iio/iio.h>
27 #include <linux/iio/sysfs.h>
28 #include <linux/gpio/consumer.h>
29 #include <linux/regulator/consumer.h>
30 #include <linux/interrupt.h>
31 #include <linux/irq.h> /* For irq_get_irq_data() */
32 #include <linux/completion.h>
33 #include <linux/pm_runtime.h>
34 #include <linux/random.h>
39 * These enums are used for indexing into the array of calibration
40 * coefficients for BMP180.
42 enum { AC1, AC2, AC3, AC4, AC5, AC6, B1, B2, MB, MC, MD };
61 struct regmap *regmap;
62 struct completion done;
64 const struct bmp280_chip_info *chip_info;
65 struct bmp180_calib calib;
66 struct regulator *vddd;
67 struct regulator *vdda;
68 unsigned int start_up_time; /* in microseconds */
70 /* log of base 2 of oversampling rate */
71 u8 oversampling_press;
73 u8 oversampling_humid;
76 * Carryover value from temperature conversion, used in pressure
82 struct bmp280_chip_info {
83 const int *oversampling_temp_avail;
84 int num_oversampling_temp_avail;
86 const int *oversampling_press_avail;
87 int num_oversampling_press_avail;
89 const int *oversampling_humid_avail;
90 int num_oversampling_humid_avail;
92 int (*chip_config)(struct bmp280_data *);
93 int (*read_temp)(struct bmp280_data *, int *);
94 int (*read_press)(struct bmp280_data *, int *, int *);
95 int (*read_humid)(struct bmp280_data *, int *, int *);
99 * These enums are used for indexing into the array of compensation
100 * parameters for BMP280.
103 enum { P1, P2, P3, P4, P5, P6, P7, P8, P9 };
105 static const struct iio_chan_spec bmp280_channels[] = {
107 .type = IIO_PRESSURE,
108 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
109 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
113 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
114 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
117 .type = IIO_HUMIDITYRELATIVE,
118 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
119 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
124 * Returns humidity in percent, resolution is 0.01 percent. Output value of
125 * "47445" represents 47445/1024 = 46.333 %RH.
127 * Taken from BME280 datasheet, Section 4.2.3, "Compensation formula".
130 static u32 bmp280_compensate_humidity(struct bmp280_data *data,
133 struct device *dev = data->dev;
134 unsigned int H1, H3, tmp;
135 int H2, H4, H5, H6, ret, var;
137 ret = regmap_read(data->regmap, BMP280_REG_COMP_H1, &H1);
139 dev_err(dev, "failed to read H1 comp value\n");
143 ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_H2, &tmp, 2);
145 dev_err(dev, "failed to read H2 comp value\n");
148 H2 = sign_extend32(le16_to_cpu(tmp), 15);
150 ret = regmap_read(data->regmap, BMP280_REG_COMP_H3, &H3);
152 dev_err(dev, "failed to read H3 comp value\n");
156 ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_H4, &tmp, 2);
158 dev_err(dev, "failed to read H4 comp value\n");
161 H4 = sign_extend32(((be16_to_cpu(tmp) >> 4) & 0xff0) |
162 (be16_to_cpu(tmp) & 0xf), 11);
164 ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_H5, &tmp, 2);
166 dev_err(dev, "failed to read H5 comp value\n");
169 H5 = sign_extend32(((le16_to_cpu(tmp) >> 4) & 0xfff), 11);
171 ret = regmap_read(data->regmap, BMP280_REG_COMP_H6, &tmp);
173 dev_err(dev, "failed to read H6 comp value\n");
176 H6 = sign_extend32(tmp, 7);
178 var = ((s32)data->t_fine) - (s32)76800;
179 var = ((((adc_humidity << 14) - (H4 << 20) - (H5 * var))
180 + (s32)16384) >> 15) * (((((((var * H6) >> 10)
181 * (((var * (s32)H3) >> 11) + (s32)32768)) >> 10)
182 + (s32)2097152) * H2 + 8192) >> 14);
183 var -= ((((var >> 15) * (var >> 15)) >> 7) * (s32)H1) >> 4;
185 var = clamp_val(var, 0, 419430400);
191 * Returns temperature in DegC, resolution is 0.01 DegC. Output value of
192 * "5123" equals 51.23 DegC. t_fine carries fine temperature as global
195 * Taken from datasheet, Section 3.11.3, "Compensation formula".
197 static s32 bmp280_compensate_temp(struct bmp280_data *data,
202 __le16 buf[BMP280_COMP_TEMP_REG_COUNT / 2];
204 ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_TEMP_START,
205 buf, BMP280_COMP_TEMP_REG_COUNT);
208 "failed to read temperature calibration parameters\n");
213 * The double casts are necessary because le16_to_cpu returns an
214 * unsigned 16-bit value. Casting that value directly to a
215 * signed 32-bit will not do proper sign extension.
217 * Conversely, T1 and P1 are unsigned values, so they can be
218 * cast straight to the larger type.
220 var1 = (((adc_temp >> 3) - ((s32)le16_to_cpu(buf[T1]) << 1)) *
221 ((s32)(s16)le16_to_cpu(buf[T2]))) >> 11;
222 var2 = (((((adc_temp >> 4) - ((s32)le16_to_cpu(buf[T1]))) *
223 ((adc_temp >> 4) - ((s32)le16_to_cpu(buf[T1])))) >> 12) *
224 ((s32)(s16)le16_to_cpu(buf[T3]))) >> 14;
225 data->t_fine = var1 + var2;
227 return (data->t_fine * 5 + 128) >> 8;
231 * Returns pressure in Pa as unsigned 32 bit integer in Q24.8 format (24
232 * integer bits and 8 fractional bits). Output value of "24674867"
233 * represents 24674867/256 = 96386.2 Pa = 963.862 hPa
235 * Taken from datasheet, Section 3.11.3, "Compensation formula".
237 static u32 bmp280_compensate_press(struct bmp280_data *data,
242 __le16 buf[BMP280_COMP_PRESS_REG_COUNT / 2];
244 ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_PRESS_START,
245 buf, BMP280_COMP_PRESS_REG_COUNT);
248 "failed to read pressure calibration parameters\n");
252 var1 = ((s64)data->t_fine) - 128000;
253 var2 = var1 * var1 * (s64)(s16)le16_to_cpu(buf[P6]);
254 var2 += (var1 * (s64)(s16)le16_to_cpu(buf[P5])) << 17;
255 var2 += ((s64)(s16)le16_to_cpu(buf[P4])) << 35;
256 var1 = ((var1 * var1 * (s64)(s16)le16_to_cpu(buf[P3])) >> 8) +
257 ((var1 * (s64)(s16)le16_to_cpu(buf[P2])) << 12);
258 var1 = ((((s64)1) << 47) + var1) * ((s64)le16_to_cpu(buf[P1])) >> 33;
263 p = ((((s64)1048576 - adc_press) << 31) - var2) * 3125;
264 p = div64_s64(p, var1);
265 var1 = (((s64)(s16)le16_to_cpu(buf[P9])) * (p >> 13) * (p >> 13)) >> 25;
266 var2 = (((s64)(s16)le16_to_cpu(buf[P8])) * p) >> 19;
267 p = ((p + var1 + var2) >> 8) + (((s64)(s16)le16_to_cpu(buf[P7])) << 4);
272 static int bmp280_read_temp(struct bmp280_data *data,
277 s32 adc_temp, comp_temp;
279 ret = regmap_bulk_read(data->regmap, BMP280_REG_TEMP_MSB,
282 dev_err(data->dev, "failed to read temperature\n");
286 adc_temp = be32_to_cpu(tmp) >> 12;
287 if (adc_temp == BMP280_TEMP_SKIPPED) {
288 /* reading was skipped */
289 dev_err(data->dev, "reading temperature skipped\n");
292 comp_temp = bmp280_compensate_temp(data, adc_temp);
295 * val might be NULL if we're called by the read_press routine,
296 * who only cares about the carry over t_fine value.
299 *val = comp_temp * 10;
306 static int bmp280_read_press(struct bmp280_data *data,
314 /* Read and compensate temperature so we get a reading of t_fine. */
315 ret = bmp280_read_temp(data, NULL);
319 ret = regmap_bulk_read(data->regmap, BMP280_REG_PRESS_MSB,
322 dev_err(data->dev, "failed to read pressure\n");
326 adc_press = be32_to_cpu(tmp) >> 12;
327 if (adc_press == BMP280_PRESS_SKIPPED) {
328 /* reading was skipped */
329 dev_err(data->dev, "reading pressure skipped\n");
332 comp_press = bmp280_compensate_press(data, adc_press);
337 return IIO_VAL_FRACTIONAL;
340 static int bmp280_read_humid(struct bmp280_data *data, int *val, int *val2)
347 /* Read and compensate temperature so we get a reading of t_fine. */
348 ret = bmp280_read_temp(data, NULL);
352 ret = regmap_bulk_read(data->regmap, BMP280_REG_HUMIDITY_MSB,
355 dev_err(data->dev, "failed to read humidity\n");
359 adc_humidity = be16_to_cpu(tmp);
360 if (adc_humidity == BMP280_HUMIDITY_SKIPPED) {
361 /* reading was skipped */
362 dev_err(data->dev, "reading humidity skipped\n");
365 comp_humidity = bmp280_compensate_humidity(data, adc_humidity);
367 *val = comp_humidity * 1000 / 1024;
372 static int bmp280_read_raw(struct iio_dev *indio_dev,
373 struct iio_chan_spec const *chan,
374 int *val, int *val2, long mask)
377 struct bmp280_data *data = iio_priv(indio_dev);
379 pm_runtime_get_sync(data->dev);
380 mutex_lock(&data->lock);
383 case IIO_CHAN_INFO_PROCESSED:
384 switch (chan->type) {
385 case IIO_HUMIDITYRELATIVE:
386 ret = data->chip_info->read_humid(data, val, val2);
389 ret = data->chip_info->read_press(data, val, val2);
392 ret = data->chip_info->read_temp(data, val);
399 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
400 switch (chan->type) {
401 case IIO_HUMIDITYRELATIVE:
402 *val = 1 << data->oversampling_humid;
406 *val = 1 << data->oversampling_press;
410 *val = 1 << data->oversampling_temp;
423 mutex_unlock(&data->lock);
424 pm_runtime_mark_last_busy(data->dev);
425 pm_runtime_put_autosuspend(data->dev);
430 static int bmp280_write_oversampling_ratio_humid(struct bmp280_data *data,
434 const int *avail = data->chip_info->oversampling_humid_avail;
435 const int n = data->chip_info->num_oversampling_humid_avail;
437 for (i = 0; i < n; i++) {
438 if (avail[i] == val) {
439 data->oversampling_humid = ilog2(val);
441 return data->chip_info->chip_config(data);
447 static int bmp280_write_oversampling_ratio_temp(struct bmp280_data *data,
451 const int *avail = data->chip_info->oversampling_temp_avail;
452 const int n = data->chip_info->num_oversampling_temp_avail;
454 for (i = 0; i < n; i++) {
455 if (avail[i] == val) {
456 data->oversampling_temp = ilog2(val);
458 return data->chip_info->chip_config(data);
464 static int bmp280_write_oversampling_ratio_press(struct bmp280_data *data,
468 const int *avail = data->chip_info->oversampling_press_avail;
469 const int n = data->chip_info->num_oversampling_press_avail;
471 for (i = 0; i < n; i++) {
472 if (avail[i] == val) {
473 data->oversampling_press = ilog2(val);
475 return data->chip_info->chip_config(data);
481 static int bmp280_write_raw(struct iio_dev *indio_dev,
482 struct iio_chan_spec const *chan,
483 int val, int val2, long mask)
486 struct bmp280_data *data = iio_priv(indio_dev);
489 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
490 pm_runtime_get_sync(data->dev);
491 mutex_lock(&data->lock);
492 switch (chan->type) {
493 case IIO_HUMIDITYRELATIVE:
494 ret = bmp280_write_oversampling_ratio_humid(data, val);
497 ret = bmp280_write_oversampling_ratio_press(data, val);
500 ret = bmp280_write_oversampling_ratio_temp(data, val);
506 mutex_unlock(&data->lock);
507 pm_runtime_mark_last_busy(data->dev);
508 pm_runtime_put_autosuspend(data->dev);
517 static ssize_t bmp280_show_avail(char *buf, const int *vals, const int n)
522 for (i = 0; i < n; i++)
523 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", vals[i]);
530 static ssize_t bmp280_show_temp_oversampling_avail(struct device *dev,
531 struct device_attribute *attr, char *buf)
533 struct bmp280_data *data = iio_priv(dev_to_iio_dev(dev));
535 return bmp280_show_avail(buf, data->chip_info->oversampling_temp_avail,
536 data->chip_info->num_oversampling_temp_avail);
539 static ssize_t bmp280_show_press_oversampling_avail(struct device *dev,
540 struct device_attribute *attr, char *buf)
542 struct bmp280_data *data = iio_priv(dev_to_iio_dev(dev));
544 return bmp280_show_avail(buf, data->chip_info->oversampling_press_avail,
545 data->chip_info->num_oversampling_press_avail);
548 static IIO_DEVICE_ATTR(in_temp_oversampling_ratio_available,
549 S_IRUGO, bmp280_show_temp_oversampling_avail, NULL, 0);
551 static IIO_DEVICE_ATTR(in_pressure_oversampling_ratio_available,
552 S_IRUGO, bmp280_show_press_oversampling_avail, NULL, 0);
554 static struct attribute *bmp280_attributes[] = {
555 &iio_dev_attr_in_temp_oversampling_ratio_available.dev_attr.attr,
556 &iio_dev_attr_in_pressure_oversampling_ratio_available.dev_attr.attr,
560 static const struct attribute_group bmp280_attrs_group = {
561 .attrs = bmp280_attributes,
564 static const struct iio_info bmp280_info = {
565 .driver_module = THIS_MODULE,
566 .read_raw = &bmp280_read_raw,
567 .write_raw = &bmp280_write_raw,
568 .attrs = &bmp280_attrs_group,
571 static int bmp280_chip_config(struct bmp280_data *data)
574 u8 osrs = BMP280_OSRS_TEMP_X(data->oversampling_temp + 1) |
575 BMP280_OSRS_PRESS_X(data->oversampling_press + 1);
577 ret = regmap_write_bits(data->regmap, BMP280_REG_CTRL_MEAS,
578 BMP280_OSRS_TEMP_MASK |
579 BMP280_OSRS_PRESS_MASK |
581 osrs | BMP280_MODE_NORMAL);
584 "failed to write ctrl_meas register\n");
588 ret = regmap_update_bits(data->regmap, BMP280_REG_CONFIG,
593 "failed to write config register\n");
600 static const int bmp280_oversampling_avail[] = { 1, 2, 4, 8, 16 };
602 static const struct bmp280_chip_info bmp280_chip_info = {
603 .oversampling_temp_avail = bmp280_oversampling_avail,
604 .num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),
606 .oversampling_press_avail = bmp280_oversampling_avail,
607 .num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),
609 .chip_config = bmp280_chip_config,
610 .read_temp = bmp280_read_temp,
611 .read_press = bmp280_read_press,
614 static int bme280_chip_config(struct bmp280_data *data)
617 u8 osrs = BMP280_OSRS_HUMIDITIY_X(data->oversampling_humid + 1);
620 * Oversampling of humidity must be set before oversampling of
621 * temperature/pressure is set to become effective.
623 ret = regmap_update_bits(data->regmap, BMP280_REG_CTRL_HUMIDITY,
624 BMP280_OSRS_HUMIDITY_MASK, osrs);
629 return bmp280_chip_config(data);
632 static const struct bmp280_chip_info bme280_chip_info = {
633 .oversampling_temp_avail = bmp280_oversampling_avail,
634 .num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),
636 .oversampling_press_avail = bmp280_oversampling_avail,
637 .num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),
639 .oversampling_humid_avail = bmp280_oversampling_avail,
640 .num_oversampling_humid_avail = ARRAY_SIZE(bmp280_oversampling_avail),
642 .chip_config = bme280_chip_config,
643 .read_temp = bmp280_read_temp,
644 .read_press = bmp280_read_press,
645 .read_humid = bmp280_read_humid,
648 static int bmp180_measure(struct bmp280_data *data, u8 ctrl_meas)
651 const int conversion_time_max[] = { 4500, 7500, 13500, 25500 };
652 unsigned int delay_us;
656 reinit_completion(&data->done);
658 ret = regmap_write(data->regmap, BMP280_REG_CTRL_MEAS, ctrl_meas);
664 * If we have a completion interrupt, use it, wait up to
665 * 100ms. The longest conversion time listed is 76.5 ms for
666 * advanced resolution mode.
668 ret = wait_for_completion_timeout(&data->done,
669 1 + msecs_to_jiffies(100));
671 dev_err(data->dev, "timeout waiting for completion\n");
673 if (ctrl_meas == BMP180_MEAS_TEMP)
677 conversion_time_max[data->oversampling_press];
679 usleep_range(delay_us, delay_us + 1000);
682 ret = regmap_read(data->regmap, BMP280_REG_CTRL_MEAS, &ctrl);
686 /* The value of this bit reset to "0" after conversion is complete */
687 if (ctrl & BMP180_MEAS_SCO)
693 static int bmp180_read_adc_temp(struct bmp280_data *data, int *val)
698 ret = bmp180_measure(data, BMP180_MEAS_TEMP);
702 ret = regmap_bulk_read(data->regmap, BMP180_REG_OUT_MSB, (u8 *)&tmp, 2);
706 *val = be16_to_cpu(tmp);
711 static int bmp180_read_calib(struct bmp280_data *data,
712 struct bmp180_calib *calib)
716 __be16 buf[BMP180_REG_CALIB_COUNT / 2];
718 ret = regmap_bulk_read(data->regmap, BMP180_REG_CALIB_START, buf,
724 /* None of the words has the value 0 or 0xFFFF */
725 for (i = 0; i < ARRAY_SIZE(buf); i++) {
726 if (buf[i] == cpu_to_be16(0) || buf[i] == cpu_to_be16(0xffff))
730 /* Toss the calibration data into the entropy pool */
731 add_device_randomness(buf, sizeof(buf));
733 calib->AC1 = be16_to_cpu(buf[AC1]);
734 calib->AC2 = be16_to_cpu(buf[AC2]);
735 calib->AC3 = be16_to_cpu(buf[AC3]);
736 calib->AC4 = be16_to_cpu(buf[AC4]);
737 calib->AC5 = be16_to_cpu(buf[AC5]);
738 calib->AC6 = be16_to_cpu(buf[AC6]);
739 calib->B1 = be16_to_cpu(buf[B1]);
740 calib->B2 = be16_to_cpu(buf[B2]);
741 calib->MB = be16_to_cpu(buf[MB]);
742 calib->MC = be16_to_cpu(buf[MC]);
743 calib->MD = be16_to_cpu(buf[MD]);
749 * Returns temperature in DegC, resolution is 0.1 DegC.
750 * t_fine carries fine temperature as global value.
752 * Taken from datasheet, Section 3.5, "Calculating pressure and temperature".
754 static s32 bmp180_compensate_temp(struct bmp280_data *data, s32 adc_temp)
757 struct bmp180_calib *calib = &data->calib;
759 x1 = ((adc_temp - calib->AC6) * calib->AC5) >> 15;
760 x2 = (calib->MC << 11) / (x1 + calib->MD);
761 data->t_fine = x1 + x2;
763 return (data->t_fine + 8) >> 4;
766 static int bmp180_read_temp(struct bmp280_data *data, int *val)
769 s32 adc_temp, comp_temp;
771 ret = bmp180_read_adc_temp(data, &adc_temp);
775 comp_temp = bmp180_compensate_temp(data, adc_temp);
778 * val might be NULL if we're called by the read_press routine,
779 * who only cares about the carry over t_fine value.
782 *val = comp_temp * 100;
789 static int bmp180_read_adc_press(struct bmp280_data *data, int *val)
793 u8 oss = data->oversampling_press;
795 ret = bmp180_measure(data, BMP180_MEAS_PRESS_X(oss));
799 ret = regmap_bulk_read(data->regmap, BMP180_REG_OUT_MSB, (u8 *)&tmp, 3);
803 *val = (be32_to_cpu(tmp) >> 8) >> (8 - oss);
809 * Returns pressure in Pa, resolution is 1 Pa.
811 * Taken from datasheet, Section 3.5, "Calculating pressure and temperature".
813 static u32 bmp180_compensate_press(struct bmp280_data *data, s32 adc_press)
818 s32 oss = data->oversampling_press;
819 struct bmp180_calib *calib = &data->calib;
821 b6 = data->t_fine - 4000;
822 x1 = (calib->B2 * (b6 * b6 >> 12)) >> 11;
823 x2 = calib->AC2 * b6 >> 11;
825 b3 = ((((s32)calib->AC1 * 4 + x3) << oss) + 2) / 4;
826 x1 = calib->AC3 * b6 >> 13;
827 x2 = (calib->B1 * ((b6 * b6) >> 12)) >> 16;
828 x3 = (x1 + x2 + 2) >> 2;
829 b4 = calib->AC4 * (u32)(x3 + 32768) >> 15;
830 b7 = ((u32)adc_press - b3) * (50000 >> oss);
836 x1 = (p >> 8) * (p >> 8);
837 x1 = (x1 * 3038) >> 16;
838 x2 = (-7357 * p) >> 16;
840 return p + ((x1 + x2 + 3791) >> 4);
843 static int bmp180_read_press(struct bmp280_data *data,
850 /* Read and compensate temperature so we get a reading of t_fine. */
851 ret = bmp180_read_temp(data, NULL);
855 ret = bmp180_read_adc_press(data, &adc_press);
859 comp_press = bmp180_compensate_press(data, adc_press);
864 return IIO_VAL_FRACTIONAL;
867 static int bmp180_chip_config(struct bmp280_data *data)
872 static const int bmp180_oversampling_temp_avail[] = { 1 };
873 static const int bmp180_oversampling_press_avail[] = { 1, 2, 4, 8 };
875 static const struct bmp280_chip_info bmp180_chip_info = {
876 .oversampling_temp_avail = bmp180_oversampling_temp_avail,
877 .num_oversampling_temp_avail =
878 ARRAY_SIZE(bmp180_oversampling_temp_avail),
880 .oversampling_press_avail = bmp180_oversampling_press_avail,
881 .num_oversampling_press_avail =
882 ARRAY_SIZE(bmp180_oversampling_press_avail),
884 .chip_config = bmp180_chip_config,
885 .read_temp = bmp180_read_temp,
886 .read_press = bmp180_read_press,
889 static irqreturn_t bmp085_eoc_irq(int irq, void *d)
891 struct bmp280_data *data = d;
893 complete(&data->done);
898 static int bmp085_fetch_eoc_irq(struct device *dev,
901 struct bmp280_data *data)
903 unsigned long irq_trig;
906 irq_trig = irqd_get_trigger_type(irq_get_irq_data(irq));
907 if (irq_trig != IRQF_TRIGGER_RISING) {
908 dev_err(dev, "non-rising trigger given for EOC interrupt, "
909 "trying to enforce it\n");
910 irq_trig = IRQF_TRIGGER_RISING;
913 init_completion(&data->done);
915 ret = devm_request_threaded_irq(dev,
923 /* Bail out without IRQ but keep the driver in place */
924 dev_err(dev, "unable to request DRDY IRQ\n");
928 data->use_eoc = true;
932 int bmp280_common_probe(struct device *dev,
933 struct regmap *regmap,
939 struct iio_dev *indio_dev;
940 struct bmp280_data *data;
941 unsigned int chip_id;
942 struct gpio_desc *gpiod;
944 indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
948 data = iio_priv(indio_dev);
949 mutex_init(&data->lock);
952 indio_dev->dev.parent = dev;
953 indio_dev->name = name;
954 indio_dev->channels = bmp280_channels;
955 indio_dev->info = &bmp280_info;
956 indio_dev->modes = INDIO_DIRECT_MODE;
960 indio_dev->num_channels = 2;
961 data->chip_info = &bmp180_chip_info;
962 data->oversampling_press = ilog2(8);
963 data->oversampling_temp = ilog2(1);
964 data->start_up_time = 10000;
967 indio_dev->num_channels = 2;
968 data->chip_info = &bmp280_chip_info;
969 data->oversampling_press = ilog2(16);
970 data->oversampling_temp = ilog2(2);
971 data->start_up_time = 2000;
974 indio_dev->num_channels = 3;
975 data->chip_info = &bme280_chip_info;
976 data->oversampling_press = ilog2(16);
977 data->oversampling_humid = ilog2(16);
978 data->oversampling_temp = ilog2(2);
979 data->start_up_time = 2000;
985 /* Bring up regulators */
986 data->vddd = devm_regulator_get(dev, "vddd");
987 if (IS_ERR(data->vddd)) {
988 dev_err(dev, "failed to get VDDD regulator\n");
989 return PTR_ERR(data->vddd);
991 ret = regulator_enable(data->vddd);
993 dev_err(dev, "failed to enable VDDD regulator\n");
996 data->vdda = devm_regulator_get(dev, "vdda");
997 if (IS_ERR(data->vdda)) {
998 dev_err(dev, "failed to get VDDA regulator\n");
999 ret = PTR_ERR(data->vdda);
1000 goto out_disable_vddd;
1002 ret = regulator_enable(data->vdda);
1004 dev_err(dev, "failed to enable VDDA regulator\n");
1005 goto out_disable_vddd;
1007 /* Wait to make sure we started up properly */
1008 usleep_range(data->start_up_time, data->start_up_time + 100);
1010 /* Bring chip out of reset if there is an assigned GPIO line */
1011 gpiod = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
1012 /* Deassert the signal */
1013 if (!IS_ERR(gpiod)) {
1014 dev_info(dev, "release reset\n");
1015 gpiod_set_value(gpiod, 0);
1018 data->regmap = regmap;
1019 ret = regmap_read(regmap, BMP280_REG_ID, &chip_id);
1021 goto out_disable_vdda;
1022 if (chip_id != chip) {
1023 dev_err(dev, "bad chip id: expected %x got %x\n",
1026 goto out_disable_vdda;
1029 ret = data->chip_info->chip_config(data);
1031 goto out_disable_vdda;
1033 dev_set_drvdata(dev, indio_dev);
1036 * The BMP085 and BMP180 has calibration in an E2PROM, read it out
1037 * at probe time. It will not change.
1039 if (chip_id == BMP180_CHIP_ID) {
1040 ret = bmp180_read_calib(data, &data->calib);
1043 "failed to read calibration coefficients\n");
1044 goto out_disable_vdda;
1049 * Attempt to grab an optional EOC IRQ - only the BMP085 has this
1050 * however as it happens, the BMP085 shares the chip ID of BMP180
1051 * so we look for an IRQ if we have that.
1053 if (irq > 0 || (chip_id == BMP180_CHIP_ID)) {
1054 ret = bmp085_fetch_eoc_irq(dev, name, irq, data);
1056 goto out_disable_vdda;
1059 /* Enable runtime PM */
1060 pm_runtime_get_noresume(dev);
1061 pm_runtime_set_active(dev);
1062 pm_runtime_enable(dev);
1064 * Set autosuspend to two orders of magnitude larger than the
1067 pm_runtime_set_autosuspend_delay(dev, data->start_up_time / 10);
1068 pm_runtime_use_autosuspend(dev);
1069 pm_runtime_put(dev);
1071 ret = iio_device_register(indio_dev);
1073 goto out_runtime_pm_disable;
1078 out_runtime_pm_disable:
1079 pm_runtime_get_sync(data->dev);
1080 pm_runtime_put_noidle(data->dev);
1081 pm_runtime_disable(data->dev);
1083 regulator_disable(data->vdda);
1085 regulator_disable(data->vddd);
1088 EXPORT_SYMBOL(bmp280_common_probe);
1090 int bmp280_common_remove(struct device *dev)
1092 struct iio_dev *indio_dev = dev_get_drvdata(dev);
1093 struct bmp280_data *data = iio_priv(indio_dev);
1095 iio_device_unregister(indio_dev);
1096 pm_runtime_get_sync(data->dev);
1097 pm_runtime_put_noidle(data->dev);
1098 pm_runtime_disable(data->dev);
1099 regulator_disable(data->vdda);
1100 regulator_disable(data->vddd);
1103 EXPORT_SYMBOL(bmp280_common_remove);
1106 static int bmp280_runtime_suspend(struct device *dev)
1108 struct iio_dev *indio_dev = dev_get_drvdata(dev);
1109 struct bmp280_data *data = iio_priv(indio_dev);
1112 ret = regulator_disable(data->vdda);
1115 return regulator_disable(data->vddd);
1118 static int bmp280_runtime_resume(struct device *dev)
1120 struct iio_dev *indio_dev = dev_get_drvdata(dev);
1121 struct bmp280_data *data = iio_priv(indio_dev);
1124 ret = regulator_enable(data->vddd);
1127 ret = regulator_enable(data->vdda);
1130 usleep_range(data->start_up_time, data->start_up_time + 100);
1131 return data->chip_info->chip_config(data);
1133 #endif /* CONFIG_PM */
1135 const struct dev_pm_ops bmp280_dev_pm_ops = {
1136 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
1137 pm_runtime_force_resume)
1138 SET_RUNTIME_PM_OPS(bmp280_runtime_suspend,
1139 bmp280_runtime_resume, NULL)
1141 EXPORT_SYMBOL(bmp280_dev_pm_ops);
1143 MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
1144 MODULE_DESCRIPTION("Driver for Bosch Sensortec BMP180/BMP280 pressure and temperature sensor");
1145 MODULE_LICENSE("GPL v2");