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;
189 * Returns temperature in DegC, resolution is 0.01 DegC. Output value of
190 * "5123" equals 51.23 DegC. t_fine carries fine temperature as global
193 * Taken from datasheet, Section 3.11.3, "Compensation formula".
195 static s32 bmp280_compensate_temp(struct bmp280_data *data,
200 __le16 buf[BMP280_COMP_TEMP_REG_COUNT / 2];
202 ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_TEMP_START,
203 buf, BMP280_COMP_TEMP_REG_COUNT);
206 "failed to read temperature calibration parameters\n");
211 * The double casts are necessary because le16_to_cpu returns an
212 * unsigned 16-bit value. Casting that value directly to a
213 * signed 32-bit will not do proper sign extension.
215 * Conversely, T1 and P1 are unsigned values, so they can be
216 * cast straight to the larger type.
218 var1 = (((adc_temp >> 3) - ((s32)le16_to_cpu(buf[T1]) << 1)) *
219 ((s32)(s16)le16_to_cpu(buf[T2]))) >> 11;
220 var2 = (((((adc_temp >> 4) - ((s32)le16_to_cpu(buf[T1]))) *
221 ((adc_temp >> 4) - ((s32)le16_to_cpu(buf[T1])))) >> 12) *
222 ((s32)(s16)le16_to_cpu(buf[T3]))) >> 14;
223 data->t_fine = var1 + var2;
225 return (data->t_fine * 5 + 128) >> 8;
229 * Returns pressure in Pa as unsigned 32 bit integer in Q24.8 format (24
230 * integer bits and 8 fractional bits). Output value of "24674867"
231 * represents 24674867/256 = 96386.2 Pa = 963.862 hPa
233 * Taken from datasheet, Section 3.11.3, "Compensation formula".
235 static u32 bmp280_compensate_press(struct bmp280_data *data,
240 __le16 buf[BMP280_COMP_PRESS_REG_COUNT / 2];
242 ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_PRESS_START,
243 buf, BMP280_COMP_PRESS_REG_COUNT);
246 "failed to read pressure calibration parameters\n");
250 var1 = ((s64)data->t_fine) - 128000;
251 var2 = var1 * var1 * (s64)(s16)le16_to_cpu(buf[P6]);
252 var2 += (var1 * (s64)(s16)le16_to_cpu(buf[P5])) << 17;
253 var2 += ((s64)(s16)le16_to_cpu(buf[P4])) << 35;
254 var1 = ((var1 * var1 * (s64)(s16)le16_to_cpu(buf[P3])) >> 8) +
255 ((var1 * (s64)(s16)le16_to_cpu(buf[P2])) << 12);
256 var1 = ((((s64)1) << 47) + var1) * ((s64)le16_to_cpu(buf[P1])) >> 33;
261 p = ((((s64)1048576 - adc_press) << 31) - var2) * 3125;
262 p = div64_s64(p, var1);
263 var1 = (((s64)(s16)le16_to_cpu(buf[P9])) * (p >> 13) * (p >> 13)) >> 25;
264 var2 = (((s64)(s16)le16_to_cpu(buf[P8])) * p) >> 19;
265 p = ((p + var1 + var2) >> 8) + (((s64)(s16)le16_to_cpu(buf[P7])) << 4);
270 static int bmp280_read_temp(struct bmp280_data *data,
275 s32 adc_temp, comp_temp;
277 ret = regmap_bulk_read(data->regmap, BMP280_REG_TEMP_MSB,
280 dev_err(data->dev, "failed to read temperature\n");
284 adc_temp = be32_to_cpu(tmp) >> 12;
285 if (adc_temp == BMP280_TEMP_SKIPPED) {
286 /* reading was skipped */
287 dev_err(data->dev, "reading temperature skipped\n");
290 comp_temp = bmp280_compensate_temp(data, adc_temp);
293 * val might be NULL if we're called by the read_press routine,
294 * who only cares about the carry over t_fine value.
297 *val = comp_temp * 10;
304 static int bmp280_read_press(struct bmp280_data *data,
312 /* Read and compensate temperature so we get a reading of t_fine. */
313 ret = bmp280_read_temp(data, NULL);
317 ret = regmap_bulk_read(data->regmap, BMP280_REG_PRESS_MSB,
320 dev_err(data->dev, "failed to read pressure\n");
324 adc_press = be32_to_cpu(tmp) >> 12;
325 if (adc_press == BMP280_PRESS_SKIPPED) {
326 /* reading was skipped */
327 dev_err(data->dev, "reading pressure skipped\n");
330 comp_press = bmp280_compensate_press(data, adc_press);
335 return IIO_VAL_FRACTIONAL;
338 static int bmp280_read_humid(struct bmp280_data *data, int *val, int *val2)
345 /* Read and compensate temperature so we get a reading of t_fine. */
346 ret = bmp280_read_temp(data, NULL);
350 ret = regmap_bulk_read(data->regmap, BMP280_REG_HUMIDITY_MSB,
353 dev_err(data->dev, "failed to read humidity\n");
357 adc_humidity = be16_to_cpu(tmp);
358 if (adc_humidity == BMP280_HUMIDITY_SKIPPED) {
359 /* reading was skipped */
360 dev_err(data->dev, "reading humidity skipped\n");
363 comp_humidity = bmp280_compensate_humidity(data, adc_humidity);
365 *val = comp_humidity;
368 return IIO_VAL_FRACTIONAL;
371 static int bmp280_read_raw(struct iio_dev *indio_dev,
372 struct iio_chan_spec const *chan,
373 int *val, int *val2, long mask)
376 struct bmp280_data *data = iio_priv(indio_dev);
378 pm_runtime_get_sync(data->dev);
379 mutex_lock(&data->lock);
382 case IIO_CHAN_INFO_PROCESSED:
383 switch (chan->type) {
384 case IIO_HUMIDITYRELATIVE:
385 ret = data->chip_info->read_humid(data, val, val2);
388 ret = data->chip_info->read_press(data, val, val2);
391 ret = data->chip_info->read_temp(data, val);
398 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
399 switch (chan->type) {
400 case IIO_HUMIDITYRELATIVE:
401 *val = 1 << data->oversampling_humid;
405 *val = 1 << data->oversampling_press;
409 *val = 1 << data->oversampling_temp;
422 mutex_unlock(&data->lock);
423 pm_runtime_mark_last_busy(data->dev);
424 pm_runtime_put_autosuspend(data->dev);
429 static int bmp280_write_oversampling_ratio_humid(struct bmp280_data *data,
433 const int *avail = data->chip_info->oversampling_humid_avail;
434 const int n = data->chip_info->num_oversampling_humid_avail;
436 for (i = 0; i < n; i++) {
437 if (avail[i] == val) {
438 data->oversampling_humid = ilog2(val);
440 return data->chip_info->chip_config(data);
446 static int bmp280_write_oversampling_ratio_temp(struct bmp280_data *data,
450 const int *avail = data->chip_info->oversampling_temp_avail;
451 const int n = data->chip_info->num_oversampling_temp_avail;
453 for (i = 0; i < n; i++) {
454 if (avail[i] == val) {
455 data->oversampling_temp = ilog2(val);
457 return data->chip_info->chip_config(data);
463 static int bmp280_write_oversampling_ratio_press(struct bmp280_data *data,
467 const int *avail = data->chip_info->oversampling_press_avail;
468 const int n = data->chip_info->num_oversampling_press_avail;
470 for (i = 0; i < n; i++) {
471 if (avail[i] == val) {
472 data->oversampling_press = ilog2(val);
474 return data->chip_info->chip_config(data);
480 static int bmp280_write_raw(struct iio_dev *indio_dev,
481 struct iio_chan_spec const *chan,
482 int val, int val2, long mask)
485 struct bmp280_data *data = iio_priv(indio_dev);
488 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
489 pm_runtime_get_sync(data->dev);
490 mutex_lock(&data->lock);
491 switch (chan->type) {
492 case IIO_HUMIDITYRELATIVE:
493 ret = bmp280_write_oversampling_ratio_humid(data, val);
496 ret = bmp280_write_oversampling_ratio_press(data, val);
499 ret = bmp280_write_oversampling_ratio_temp(data, val);
505 mutex_unlock(&data->lock);
506 pm_runtime_mark_last_busy(data->dev);
507 pm_runtime_put_autosuspend(data->dev);
516 static ssize_t bmp280_show_avail(char *buf, const int *vals, const int n)
521 for (i = 0; i < n; i++)
522 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", vals[i]);
529 static ssize_t bmp280_show_temp_oversampling_avail(struct device *dev,
530 struct device_attribute *attr, char *buf)
532 struct bmp280_data *data = iio_priv(dev_to_iio_dev(dev));
534 return bmp280_show_avail(buf, data->chip_info->oversampling_temp_avail,
535 data->chip_info->num_oversampling_temp_avail);
538 static ssize_t bmp280_show_press_oversampling_avail(struct device *dev,
539 struct device_attribute *attr, char *buf)
541 struct bmp280_data *data = iio_priv(dev_to_iio_dev(dev));
543 return bmp280_show_avail(buf, data->chip_info->oversampling_press_avail,
544 data->chip_info->num_oversampling_press_avail);
547 static IIO_DEVICE_ATTR(in_temp_oversampling_ratio_available,
548 S_IRUGO, bmp280_show_temp_oversampling_avail, NULL, 0);
550 static IIO_DEVICE_ATTR(in_pressure_oversampling_ratio_available,
551 S_IRUGO, bmp280_show_press_oversampling_avail, NULL, 0);
553 static struct attribute *bmp280_attributes[] = {
554 &iio_dev_attr_in_temp_oversampling_ratio_available.dev_attr.attr,
555 &iio_dev_attr_in_pressure_oversampling_ratio_available.dev_attr.attr,
559 static const struct attribute_group bmp280_attrs_group = {
560 .attrs = bmp280_attributes,
563 static const struct iio_info bmp280_info = {
564 .driver_module = THIS_MODULE,
565 .read_raw = &bmp280_read_raw,
566 .write_raw = &bmp280_write_raw,
567 .attrs = &bmp280_attrs_group,
570 static int bmp280_chip_config(struct bmp280_data *data)
573 u8 osrs = BMP280_OSRS_TEMP_X(data->oversampling_temp + 1) |
574 BMP280_OSRS_PRESS_X(data->oversampling_press + 1);
576 ret = regmap_update_bits(data->regmap, BMP280_REG_CTRL_MEAS,
577 BMP280_OSRS_TEMP_MASK |
578 BMP280_OSRS_PRESS_MASK |
580 osrs | BMP280_MODE_NORMAL);
583 "failed to write ctrl_meas register\n");
587 ret = regmap_update_bits(data->regmap, BMP280_REG_CONFIG,
592 "failed to write config register\n");
599 static const int bmp280_oversampling_avail[] = { 1, 2, 4, 8, 16 };
601 static const struct bmp280_chip_info bmp280_chip_info = {
602 .oversampling_temp_avail = bmp280_oversampling_avail,
603 .num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),
605 .oversampling_press_avail = bmp280_oversampling_avail,
606 .num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),
608 .chip_config = bmp280_chip_config,
609 .read_temp = bmp280_read_temp,
610 .read_press = bmp280_read_press,
613 static int bme280_chip_config(struct bmp280_data *data)
616 u8 osrs = BMP280_OSRS_HUMIDITIY_X(data->oversampling_humid + 1);
619 * Oversampling of humidity must be set before oversampling of
620 * temperature/pressure is set to become effective.
622 ret = regmap_update_bits(data->regmap, BMP280_REG_CTRL_HUMIDITY,
623 BMP280_OSRS_HUMIDITY_MASK, osrs);
628 return bmp280_chip_config(data);
631 static const struct bmp280_chip_info bme280_chip_info = {
632 .oversampling_temp_avail = bmp280_oversampling_avail,
633 .num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),
635 .oversampling_press_avail = bmp280_oversampling_avail,
636 .num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),
638 .oversampling_humid_avail = bmp280_oversampling_avail,
639 .num_oversampling_humid_avail = ARRAY_SIZE(bmp280_oversampling_avail),
641 .chip_config = bme280_chip_config,
642 .read_temp = bmp280_read_temp,
643 .read_press = bmp280_read_press,
644 .read_humid = bmp280_read_humid,
647 static int bmp180_measure(struct bmp280_data *data, u8 ctrl_meas)
650 const int conversion_time_max[] = { 4500, 7500, 13500, 25500 };
651 unsigned int delay_us;
655 init_completion(&data->done);
657 ret = regmap_write(data->regmap, BMP280_REG_CTRL_MEAS, ctrl_meas);
663 * If we have a completion interrupt, use it, wait up to
664 * 100ms. The longest conversion time listed is 76.5 ms for
665 * advanced resolution mode.
667 ret = wait_for_completion_timeout(&data->done,
668 1 + msecs_to_jiffies(100));
670 dev_err(data->dev, "timeout waiting for completion\n");
672 if (ctrl_meas == BMP180_MEAS_TEMP)
676 conversion_time_max[data->oversampling_press];
678 usleep_range(delay_us, delay_us + 1000);
681 ret = regmap_read(data->regmap, BMP280_REG_CTRL_MEAS, &ctrl);
685 /* The value of this bit reset to "0" after conversion is complete */
686 if (ctrl & BMP180_MEAS_SCO)
692 static int bmp180_read_adc_temp(struct bmp280_data *data, int *val)
697 ret = bmp180_measure(data, BMP180_MEAS_TEMP);
701 ret = regmap_bulk_read(data->regmap, BMP180_REG_OUT_MSB, (u8 *)&tmp, 2);
705 *val = be16_to_cpu(tmp);
710 static int bmp180_read_calib(struct bmp280_data *data,
711 struct bmp180_calib *calib)
715 __be16 buf[BMP180_REG_CALIB_COUNT / 2];
717 ret = regmap_bulk_read(data->regmap, BMP180_REG_CALIB_START, buf,
723 /* None of the words has the value 0 or 0xFFFF */
724 for (i = 0; i < ARRAY_SIZE(buf); i++) {
725 if (buf[i] == cpu_to_be16(0) || buf[i] == cpu_to_be16(0xffff))
729 /* Toss the calibration data into the entropy pool */
730 add_device_randomness(buf, sizeof(buf));
732 calib->AC1 = be16_to_cpu(buf[AC1]);
733 calib->AC2 = be16_to_cpu(buf[AC2]);
734 calib->AC3 = be16_to_cpu(buf[AC3]);
735 calib->AC4 = be16_to_cpu(buf[AC4]);
736 calib->AC5 = be16_to_cpu(buf[AC5]);
737 calib->AC6 = be16_to_cpu(buf[AC6]);
738 calib->B1 = be16_to_cpu(buf[B1]);
739 calib->B2 = be16_to_cpu(buf[B2]);
740 calib->MB = be16_to_cpu(buf[MB]);
741 calib->MC = be16_to_cpu(buf[MC]);
742 calib->MD = be16_to_cpu(buf[MD]);
748 * Returns temperature in DegC, resolution is 0.1 DegC.
749 * t_fine carries fine temperature as global value.
751 * Taken from datasheet, Section 3.5, "Calculating pressure and temperature".
753 static s32 bmp180_compensate_temp(struct bmp280_data *data, s32 adc_temp)
756 struct bmp180_calib *calib = &data->calib;
758 x1 = ((adc_temp - calib->AC6) * calib->AC5) >> 15;
759 x2 = (calib->MC << 11) / (x1 + calib->MD);
760 data->t_fine = x1 + x2;
762 return (data->t_fine + 8) >> 4;
765 static int bmp180_read_temp(struct bmp280_data *data, int *val)
768 s32 adc_temp, comp_temp;
770 ret = bmp180_read_adc_temp(data, &adc_temp);
774 comp_temp = bmp180_compensate_temp(data, adc_temp);
777 * val might be NULL if we're called by the read_press routine,
778 * who only cares about the carry over t_fine value.
781 *val = comp_temp * 100;
788 static int bmp180_read_adc_press(struct bmp280_data *data, int *val)
792 u8 oss = data->oversampling_press;
794 ret = bmp180_measure(data, BMP180_MEAS_PRESS_X(oss));
798 ret = regmap_bulk_read(data->regmap, BMP180_REG_OUT_MSB, (u8 *)&tmp, 3);
802 *val = (be32_to_cpu(tmp) >> 8) >> (8 - oss);
808 * Returns pressure in Pa, resolution is 1 Pa.
810 * Taken from datasheet, Section 3.5, "Calculating pressure and temperature".
812 static u32 bmp180_compensate_press(struct bmp280_data *data, s32 adc_press)
817 s32 oss = data->oversampling_press;
818 struct bmp180_calib *calib = &data->calib;
820 b6 = data->t_fine - 4000;
821 x1 = (calib->B2 * (b6 * b6 >> 12)) >> 11;
822 x2 = calib->AC2 * b6 >> 11;
824 b3 = ((((s32)calib->AC1 * 4 + x3) << oss) + 2) / 4;
825 x1 = calib->AC3 * b6 >> 13;
826 x2 = (calib->B1 * ((b6 * b6) >> 12)) >> 16;
827 x3 = (x1 + x2 + 2) >> 2;
828 b4 = calib->AC4 * (u32)(x3 + 32768) >> 15;
829 b7 = ((u32)adc_press - b3) * (50000 >> oss);
835 x1 = (p >> 8) * (p >> 8);
836 x1 = (x1 * 3038) >> 16;
837 x2 = (-7357 * p) >> 16;
839 return p + ((x1 + x2 + 3791) >> 4);
842 static int bmp180_read_press(struct bmp280_data *data,
849 /* Read and compensate temperature so we get a reading of t_fine. */
850 ret = bmp180_read_temp(data, NULL);
854 ret = bmp180_read_adc_press(data, &adc_press);
858 comp_press = bmp180_compensate_press(data, adc_press);
863 return IIO_VAL_FRACTIONAL;
866 static int bmp180_chip_config(struct bmp280_data *data)
871 static const int bmp180_oversampling_temp_avail[] = { 1 };
872 static const int bmp180_oversampling_press_avail[] = { 1, 2, 4, 8 };
874 static const struct bmp280_chip_info bmp180_chip_info = {
875 .oversampling_temp_avail = bmp180_oversampling_temp_avail,
876 .num_oversampling_temp_avail =
877 ARRAY_SIZE(bmp180_oversampling_temp_avail),
879 .oversampling_press_avail = bmp180_oversampling_press_avail,
880 .num_oversampling_press_avail =
881 ARRAY_SIZE(bmp180_oversampling_press_avail),
883 .chip_config = bmp180_chip_config,
884 .read_temp = bmp180_read_temp,
885 .read_press = bmp180_read_press,
888 static irqreturn_t bmp085_eoc_irq(int irq, void *d)
890 struct bmp280_data *data = d;
892 complete(&data->done);
897 static int bmp085_fetch_eoc_irq(struct device *dev,
900 struct bmp280_data *data)
902 unsigned long irq_trig;
905 irq_trig = irqd_get_trigger_type(irq_get_irq_data(irq));
906 if (irq_trig != IRQF_TRIGGER_RISING) {
907 dev_err(dev, "non-rising trigger given for EOC interrupt, "
908 "trying to enforce it\n");
909 irq_trig = IRQF_TRIGGER_RISING;
911 ret = devm_request_threaded_irq(dev,
919 /* Bail out without IRQ but keep the driver in place */
920 dev_err(dev, "unable to request DRDY IRQ\n");
924 data->use_eoc = true;
928 int bmp280_common_probe(struct device *dev,
929 struct regmap *regmap,
935 struct iio_dev *indio_dev;
936 struct bmp280_data *data;
937 unsigned int chip_id;
938 struct gpio_desc *gpiod;
940 indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
944 data = iio_priv(indio_dev);
945 mutex_init(&data->lock);
948 indio_dev->dev.parent = dev;
949 indio_dev->name = name;
950 indio_dev->channels = bmp280_channels;
951 indio_dev->info = &bmp280_info;
952 indio_dev->modes = INDIO_DIRECT_MODE;
956 indio_dev->num_channels = 2;
957 data->chip_info = &bmp180_chip_info;
958 data->oversampling_press = ilog2(8);
959 data->oversampling_temp = ilog2(1);
960 data->start_up_time = 10000;
963 indio_dev->num_channels = 2;
964 data->chip_info = &bmp280_chip_info;
965 data->oversampling_press = ilog2(16);
966 data->oversampling_temp = ilog2(2);
967 data->start_up_time = 2000;
970 indio_dev->num_channels = 3;
971 data->chip_info = &bme280_chip_info;
972 data->oversampling_press = ilog2(16);
973 data->oversampling_humid = ilog2(16);
974 data->oversampling_temp = ilog2(2);
975 data->start_up_time = 2000;
981 /* Bring up regulators */
982 data->vddd = devm_regulator_get(dev, "vddd");
983 if (IS_ERR(data->vddd)) {
984 dev_err(dev, "failed to get VDDD regulator\n");
985 return PTR_ERR(data->vddd);
987 ret = regulator_enable(data->vddd);
989 dev_err(dev, "failed to enable VDDD regulator\n");
992 data->vdda = devm_regulator_get(dev, "vdda");
993 if (IS_ERR(data->vdda)) {
994 dev_err(dev, "failed to get VDDA regulator\n");
995 ret = PTR_ERR(data->vdda);
996 goto out_disable_vddd;
998 ret = regulator_enable(data->vdda);
1000 dev_err(dev, "failed to enable VDDA regulator\n");
1001 goto out_disable_vddd;
1003 /* Wait to make sure we started up properly */
1004 usleep_range(data->start_up_time, data->start_up_time + 100);
1006 /* Bring chip out of reset if there is an assigned GPIO line */
1007 gpiod = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
1008 /* Deassert the signal */
1009 if (!IS_ERR(gpiod)) {
1010 dev_info(dev, "release reset\n");
1011 gpiod_set_value(gpiod, 0);
1014 data->regmap = regmap;
1015 ret = regmap_read(regmap, BMP280_REG_ID, &chip_id);
1017 goto out_disable_vdda;
1018 if (chip_id != chip) {
1019 dev_err(dev, "bad chip id: expected %x got %x\n",
1022 goto out_disable_vdda;
1025 ret = data->chip_info->chip_config(data);
1027 goto out_disable_vdda;
1029 dev_set_drvdata(dev, indio_dev);
1032 * The BMP085 and BMP180 has calibration in an E2PROM, read it out
1033 * at probe time. It will not change.
1035 if (chip_id == BMP180_CHIP_ID) {
1036 ret = bmp180_read_calib(data, &data->calib);
1039 "failed to read calibration coefficients\n");
1040 goto out_disable_vdda;
1045 * Attempt to grab an optional EOC IRQ - only the BMP085 has this
1046 * however as it happens, the BMP085 shares the chip ID of BMP180
1047 * so we look for an IRQ if we have that.
1049 if (irq > 0 || (chip_id == BMP180_CHIP_ID)) {
1050 ret = bmp085_fetch_eoc_irq(dev, name, irq, data);
1052 goto out_disable_vdda;
1055 /* Enable runtime PM */
1056 pm_runtime_get_noresume(dev);
1057 pm_runtime_set_active(dev);
1058 pm_runtime_enable(dev);
1060 * Set autosuspend to two orders of magnitude larger than the
1063 pm_runtime_set_autosuspend_delay(dev, data->start_up_time / 10);
1064 pm_runtime_use_autosuspend(dev);
1065 pm_runtime_put(dev);
1067 ret = iio_device_register(indio_dev);
1069 goto out_runtime_pm_disable;
1074 out_runtime_pm_disable:
1075 pm_runtime_get_sync(data->dev);
1076 pm_runtime_put_noidle(data->dev);
1077 pm_runtime_disable(data->dev);
1079 regulator_disable(data->vdda);
1081 regulator_disable(data->vddd);
1084 EXPORT_SYMBOL(bmp280_common_probe);
1086 int bmp280_common_remove(struct device *dev)
1088 struct iio_dev *indio_dev = dev_get_drvdata(dev);
1089 struct bmp280_data *data = iio_priv(indio_dev);
1091 iio_device_unregister(indio_dev);
1092 pm_runtime_get_sync(data->dev);
1093 pm_runtime_put_noidle(data->dev);
1094 pm_runtime_disable(data->dev);
1095 regulator_disable(data->vdda);
1096 regulator_disable(data->vddd);
1099 EXPORT_SYMBOL(bmp280_common_remove);
1102 static int bmp280_runtime_suspend(struct device *dev)
1104 struct iio_dev *indio_dev = dev_get_drvdata(dev);
1105 struct bmp280_data *data = iio_priv(indio_dev);
1108 ret = regulator_disable(data->vdda);
1111 return regulator_disable(data->vddd);
1114 static int bmp280_runtime_resume(struct device *dev)
1116 struct iio_dev *indio_dev = dev_get_drvdata(dev);
1117 struct bmp280_data *data = iio_priv(indio_dev);
1120 ret = regulator_enable(data->vddd);
1123 ret = regulator_enable(data->vdda);
1126 usleep_range(data->start_up_time, data->start_up_time + 100);
1127 return data->chip_info->chip_config(data);
1129 #endif /* CONFIG_PM */
1131 const struct dev_pm_ops bmp280_dev_pm_ops = {
1132 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
1133 pm_runtime_force_resume)
1134 SET_RUNTIME_PM_OPS(bmp280_runtime_suspend,
1135 bmp280_runtime_resume, NULL)
1137 EXPORT_SYMBOL(bmp280_dev_pm_ops);
1139 MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
1140 MODULE_DESCRIPTION("Driver for Bosch Sensortec BMP180/BMP280 pressure and temperature sensor");
1141 MODULE_LICENSE("GPL v2");