1 // SPDX-License-Identifier: GPL-2.0
3 * Bosch BME680 - Temperature, Pressure, Humidity & Gas Sensor
5 * Copyright (C) 2017 - 2018 Bosch Sensortec GmbH
6 * Copyright (C) 2018 Himanshu Jha <himanshujha199640@gmail.com>
9 * https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BME680-DS001-00.pdf
11 #include <linux/acpi.h>
12 #include <linux/bitfield.h>
13 #include <linux/device.h>
14 #include <linux/module.h>
15 #include <linux/log2.h>
16 #include <linux/regmap.h>
17 #include <linux/iio/iio.h>
18 #include <linux/iio/sysfs.h>
52 struct regmap *regmap;
53 struct bme680_calib bme680;
55 u8 oversampling_press;
56 u8 oversampling_humid;
60 * Carryover value from temperature conversion, used in pressure
61 * and humidity compensation calculations.
66 static const struct regmap_range bme680_volatile_ranges[] = {
67 regmap_reg_range(BME680_REG_MEAS_STAT_0, BME680_REG_GAS_R_LSB),
68 regmap_reg_range(BME680_REG_STATUS, BME680_REG_STATUS),
69 regmap_reg_range(BME680_T2_LSB_REG, BME680_GH3_REG),
72 static const struct regmap_access_table bme680_volatile_table = {
73 .yes_ranges = bme680_volatile_ranges,
74 .n_yes_ranges = ARRAY_SIZE(bme680_volatile_ranges),
77 const struct regmap_config bme680_regmap_config = {
81 .volatile_table = &bme680_volatile_table,
82 .cache_type = REGCACHE_RBTREE,
84 EXPORT_SYMBOL(bme680_regmap_config);
86 static const struct iio_chan_spec bme680_channels[] = {
89 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
90 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
94 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
95 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
98 .type = IIO_HUMIDITYRELATIVE,
99 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
100 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
103 .type = IIO_RESISTANCE,
104 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
108 static int bme680_read_calib(struct bme680_data *data,
109 struct bme680_calib *calib)
111 struct device *dev = regmap_get_device(data->regmap);
112 unsigned int tmp, tmp_msb, tmp_lsb;
116 /* Temperature related coefficients */
117 ret = regmap_bulk_read(data->regmap, BME680_T1_LSB_REG, (u8 *) &buf, 2);
119 dev_err(dev, "failed to read BME680_T1_LSB_REG\n");
122 calib->par_t1 = le16_to_cpu(buf);
124 ret = regmap_bulk_read(data->regmap, BME680_T2_LSB_REG, (u8 *) &buf, 2);
126 dev_err(dev, "failed to read BME680_T2_LSB_REG\n");
129 calib->par_t2 = le16_to_cpu(buf);
131 ret = regmap_read(data->regmap, BME680_T3_REG, &tmp);
133 dev_err(dev, "failed to read BME680_T3_REG\n");
138 /* Pressure related coefficients */
139 ret = regmap_bulk_read(data->regmap, BME680_P1_LSB_REG, (u8 *) &buf, 2);
141 dev_err(dev, "failed to read BME680_P1_LSB_REG\n");
144 calib->par_p1 = le16_to_cpu(buf);
146 ret = regmap_bulk_read(data->regmap, BME680_P2_LSB_REG, (u8 *) &buf, 2);
148 dev_err(dev, "failed to read BME680_P2_LSB_REG\n");
151 calib->par_p2 = le16_to_cpu(buf);
153 ret = regmap_read(data->regmap, BME680_P3_REG, &tmp);
155 dev_err(dev, "failed to read BME680_P3_REG\n");
160 ret = regmap_bulk_read(data->regmap, BME680_P4_LSB_REG, (u8 *) &buf, 2);
162 dev_err(dev, "failed to read BME680_P4_LSB_REG\n");
165 calib->par_p4 = le16_to_cpu(buf);
167 ret = regmap_bulk_read(data->regmap, BME680_P5_LSB_REG, (u8 *) &buf, 2);
169 dev_err(dev, "failed to read BME680_P5_LSB_REG\n");
172 calib->par_p5 = le16_to_cpu(buf);
174 ret = regmap_read(data->regmap, BME680_P6_REG, &tmp);
176 dev_err(dev, "failed to read BME680_P6_REG\n");
181 ret = regmap_read(data->regmap, BME680_P7_REG, &tmp);
183 dev_err(dev, "failed to read BME680_P7_REG\n");
188 ret = regmap_bulk_read(data->regmap, BME680_P8_LSB_REG, (u8 *) &buf, 2);
190 dev_err(dev, "failed to read BME680_P8_LSB_REG\n");
193 calib->par_p8 = le16_to_cpu(buf);
195 ret = regmap_bulk_read(data->regmap, BME680_P9_LSB_REG, (u8 *) &buf, 2);
197 dev_err(dev, "failed to read BME680_P9_LSB_REG\n");
200 calib->par_p9 = le16_to_cpu(buf);
202 ret = regmap_read(data->regmap, BME680_P10_REG, &tmp);
204 dev_err(dev, "failed to read BME680_P10_REG\n");
207 calib->par_p10 = tmp;
209 /* Humidity related coefficients */
210 ret = regmap_read(data->regmap, BME680_H1_MSB_REG, &tmp_msb);
212 dev_err(dev, "failed to read BME680_H1_MSB_REG\n");
215 ret = regmap_read(data->regmap, BME680_H1_LSB_REG, &tmp_lsb);
217 dev_err(dev, "failed to read BME680_H1_LSB_REG\n");
220 calib->par_h1 = (tmp_msb << BME680_HUM_REG_SHIFT_VAL) |
221 (tmp_lsb & BME680_BIT_H1_DATA_MASK);
223 ret = regmap_read(data->regmap, BME680_H2_MSB_REG, &tmp_msb);
225 dev_err(dev, "failed to read BME680_H2_MSB_REG\n");
228 ret = regmap_read(data->regmap, BME680_H2_LSB_REG, &tmp_lsb);
230 dev_err(dev, "failed to read BME680_H2_LSB_REG\n");
233 calib->par_h2 = (tmp_msb << BME680_HUM_REG_SHIFT_VAL) |
234 (tmp_lsb >> BME680_HUM_REG_SHIFT_VAL);
236 ret = regmap_read(data->regmap, BME680_H3_REG, &tmp);
238 dev_err(dev, "failed to read BME680_H3_REG\n");
243 ret = regmap_read(data->regmap, BME680_H4_REG, &tmp);
245 dev_err(dev, "failed to read BME680_H4_REG\n");
250 ret = regmap_read(data->regmap, BME680_H5_REG, &tmp);
252 dev_err(dev, "failed to read BME680_H5_REG\n");
257 ret = regmap_read(data->regmap, BME680_H6_REG, &tmp);
259 dev_err(dev, "failed to read BME680_H6_REG\n");
264 ret = regmap_read(data->regmap, BME680_H7_REG, &tmp);
266 dev_err(dev, "failed to read BME680_H7_REG\n");
271 /* Gas heater related coefficients */
272 ret = regmap_read(data->regmap, BME680_GH1_REG, &tmp);
274 dev_err(dev, "failed to read BME680_GH1_REG\n");
277 calib->par_gh1 = tmp;
279 ret = regmap_bulk_read(data->regmap, BME680_GH2_LSB_REG, (u8 *) &buf,
282 dev_err(dev, "failed to read BME680_GH2_LSB_REG\n");
285 calib->par_gh2 = le16_to_cpu(buf);
287 ret = regmap_read(data->regmap, BME680_GH3_REG, &tmp);
289 dev_err(dev, "failed to read BME680_GH3_REG\n");
292 calib->par_gh3 = tmp;
294 /* Other coefficients */
295 ret = regmap_read(data->regmap, BME680_REG_RES_HEAT_RANGE, &tmp);
297 dev_err(dev, "failed to read resistance heat range\n");
300 calib->res_heat_range = FIELD_GET(BME680_RHRANGE_MASK, tmp);
302 ret = regmap_read(data->regmap, BME680_REG_RES_HEAT_VAL, &tmp);
304 dev_err(dev, "failed to read resistance heat value\n");
307 calib->res_heat_val = tmp;
309 ret = regmap_read(data->regmap, BME680_REG_RANGE_SW_ERR, &tmp);
311 dev_err(dev, "failed to read range software error\n");
314 calib->range_sw_err = FIELD_GET(BME680_RSERROR_MASK, tmp);
320 * Taken from Bosch BME680 API:
321 * https://github.com/BoschSensortec/BME680_driver/blob/63bb5336/bme680.c#L876
323 * Returns temperature measurement in DegC, resolutions is 0.01 DegC. Therefore,
324 * output value of "3233" represents 32.33 DegC.
326 static s16 bme680_compensate_temp(struct bme680_data *data,
329 struct bme680_calib *calib = &data->bme680;
330 s64 var1, var2, var3;
333 /* If the calibration is invalid, attempt to reload it */
335 bme680_read_calib(data, calib);
337 var1 = (adc_temp >> 3) - (calib->par_t1 << 1);
338 var2 = (var1 * calib->par_t2) >> 11;
339 var3 = ((var1 >> 1) * (var1 >> 1)) >> 12;
340 var3 = (var3 * (calib->par_t3 << 4)) >> 14;
341 data->t_fine = var2 + var3;
342 calc_temp = (data->t_fine * 5 + 128) >> 8;
348 * Taken from Bosch BME680 API:
349 * https://github.com/BoschSensortec/BME680_driver/blob/63bb5336/bme680.c#L896
351 * Returns pressure measurement in Pa. Output value of "97356" represents
352 * 97356 Pa = 973.56 hPa.
354 static u32 bme680_compensate_press(struct bme680_data *data,
357 struct bme680_calib *calib = &data->bme680;
358 s32 var1, var2, var3, press_comp;
360 var1 = (data->t_fine >> 1) - 64000;
361 var2 = ((((var1 >> 2) * (var1 >> 2)) >> 11) * calib->par_p6) >> 2;
362 var2 = var2 + (var1 * calib->par_p5 << 1);
363 var2 = (var2 >> 2) + (calib->par_p4 << 16);
364 var1 = (((((var1 >> 2) * (var1 >> 2)) >> 13) *
365 (calib->par_p3 << 5)) >> 3) +
366 ((calib->par_p2 * var1) >> 1);
368 var1 = ((32768 + var1) * calib->par_p1) >> 15;
369 press_comp = 1048576 - adc_press;
370 press_comp = ((press_comp - (var2 >> 12)) * 3125);
372 if (press_comp >= BME680_MAX_OVERFLOW_VAL)
373 press_comp = ((press_comp / (u32)var1) << 1);
375 press_comp = ((press_comp << 1) / (u32)var1);
377 var1 = (calib->par_p9 * (((press_comp >> 3) *
378 (press_comp >> 3)) >> 13)) >> 12;
379 var2 = ((press_comp >> 2) * calib->par_p8) >> 13;
380 var3 = ((press_comp >> 8) * (press_comp >> 8) *
381 (press_comp >> 8) * calib->par_p10) >> 17;
383 press_comp += (var1 + var2 + var3 + (calib->par_p7 << 7)) >> 4;
389 * Taken from Bosch BME680 API:
390 * https://github.com/BoschSensortec/BME680_driver/blob/63bb5336/bme680.c#L937
392 * Returns humidity measurement in percent, resolution is 0.001 percent. Output
393 * value of "43215" represents 43.215 %rH.
395 static u32 bme680_compensate_humid(struct bme680_data *data,
398 struct bme680_calib *calib = &data->bme680;
399 s32 var1, var2, var3, var4, var5, var6, temp_scaled, calc_hum;
401 temp_scaled = (data->t_fine * 5 + 128) >> 8;
402 var1 = (adc_humid - ((s32) ((s32) calib->par_h1 * 16))) -
403 (((temp_scaled * (s32) calib->par_h3) / 100) >> 1);
404 var2 = ((s32) calib->par_h2 *
405 (((temp_scaled * calib->par_h4) / 100) +
406 (((temp_scaled * ((temp_scaled * calib->par_h5) / 100))
407 >> 6) / 100) + (1 << 14))) >> 10;
409 var4 = calib->par_h6 << 7;
410 var4 = (var4 + ((temp_scaled * calib->par_h7) / 100)) >> 4;
411 var5 = ((var3 >> 14) * (var3 >> 14)) >> 10;
412 var6 = (var4 * var5) >> 1;
413 calc_hum = (((var3 + var6) >> 10) * 1000) >> 12;
415 calc_hum = clamp(calc_hum, 0, 100000); /* clamp between 0-100 %rH */
421 * Taken from Bosch BME680 API:
422 * https://github.com/BoschSensortec/BME680_driver/blob/63bb5336/bme680.c#L973
424 * Returns gas measurement in Ohm. Output value of "82986" represent 82986 ohms.
426 static u32 bme680_compensate_gas(struct bme680_data *data, u16 gas_res_adc,
429 struct bme680_calib *calib = &data->bme680;
435 /* Look up table for the possible gas range values */
436 const u32 lookupTable[16] = {2147483647u, 2147483647u,
437 2147483647u, 2147483647u, 2147483647u,
438 2126008810u, 2147483647u, 2130303777u,
439 2147483647u, 2147483647u, 2143188679u,
440 2136746228u, 2147483647u, 2126008810u,
441 2147483647u, 2147483647u};
443 var1 = ((1340 + (5 * (s64) calib->range_sw_err)) *
444 ((s64) lookupTable[gas_range])) >> 16;
445 var2 = ((gas_res_adc << 15) - 16777216) + var1;
446 var3 = ((125000 << (15 - gas_range)) * var1) >> 9;
448 calc_gas_res = div64_s64(var3, (s64) var2);
454 * Taken from Bosch BME680 API:
455 * https://github.com/BoschSensortec/BME680_driver/blob/63bb5336/bme680.c#L1002
457 static u8 bme680_calc_heater_res(struct bme680_data *data, u16 temp)
459 struct bme680_calib *calib = &data->bme680;
460 s32 var1, var2, var3, var4, var5, heatr_res_x100;
463 if (temp > 400) /* Cap temperature */
466 var1 = (((s32) BME680_AMB_TEMP * calib->par_gh3) / 1000) * 256;
467 var2 = (calib->par_gh1 + 784) * (((((calib->par_gh2 + 154009) *
470 var3 = var1 + (var2 / 2);
471 var4 = (var3 / (calib->res_heat_range + 4));
472 var5 = 131 * calib->res_heat_val + 65536;
473 heatr_res_x100 = ((var4 / var5) - 250) * 34;
474 heatr_res = (heatr_res_x100 + 50) / 100;
480 * Taken from Bosch BME680 API:
481 * https://github.com/BoschSensortec/BME680_driver/blob/63bb5336/bme680.c#L1188
483 static u8 bme680_calc_heater_dur(u16 dur)
485 u8 durval, factor = 0;
488 durval = 0xff; /* Max duration */
494 durval = dur + (factor * 64);
500 static int bme680_set_mode(struct bme680_data *data, bool mode)
502 struct device *dev = regmap_get_device(data->regmap);
506 ret = regmap_write_bits(data->regmap, BME680_REG_CTRL_MEAS,
507 BME680_MODE_MASK, BME680_MODE_FORCED);
509 dev_err(dev, "failed to set forced mode\n");
512 ret = regmap_write_bits(data->regmap, BME680_REG_CTRL_MEAS,
513 BME680_MODE_MASK, BME680_MODE_SLEEP);
515 dev_err(dev, "failed to set sleep mode\n");
522 static u8 bme680_oversampling_to_reg(u8 val)
524 return ilog2(val) + 1;
527 static int bme680_chip_config(struct bme680_data *data)
529 struct device *dev = regmap_get_device(data->regmap);
534 BME680_OSRS_HUMIDITY_MASK,
535 bme680_oversampling_to_reg(data->oversampling_humid));
537 * Highly recommended to set oversampling of humidity before
538 * temperature/pressure oversampling.
540 ret = regmap_update_bits(data->regmap, BME680_REG_CTRL_HUMIDITY,
541 BME680_OSRS_HUMIDITY_MASK, osrs);
543 dev_err(dev, "failed to write ctrl_hum register\n");
547 /* IIR filter settings */
548 ret = regmap_update_bits(data->regmap, BME680_REG_CONFIG,
550 BME680_FILTER_COEFF_VAL);
552 dev_err(dev, "failed to write config register\n");
556 osrs = FIELD_PREP(BME680_OSRS_TEMP_MASK,
557 bme680_oversampling_to_reg(data->oversampling_temp)) |
558 FIELD_PREP(BME680_OSRS_PRESS_MASK,
559 bme680_oversampling_to_reg(data->oversampling_press));
560 ret = regmap_write_bits(data->regmap, BME680_REG_CTRL_MEAS,
561 BME680_OSRS_TEMP_MASK | BME680_OSRS_PRESS_MASK,
564 dev_err(dev, "failed to write ctrl_meas register\n");
569 static int bme680_gas_config(struct bme680_data *data)
571 struct device *dev = regmap_get_device(data->regmap);
573 u8 heatr_res, heatr_dur;
575 heatr_res = bme680_calc_heater_res(data, data->heater_temp);
577 /* set target heater temperature */
578 ret = regmap_write(data->regmap, BME680_REG_RES_HEAT_0, heatr_res);
580 dev_err(dev, "failed to write res_heat_0 register\n");
584 heatr_dur = bme680_calc_heater_dur(data->heater_dur);
586 /* set target heating duration */
587 ret = regmap_write(data->regmap, BME680_REG_GAS_WAIT_0, heatr_dur);
589 dev_err(dev, "failed to write gas_wait_0 register\n");
593 /* Enable the gas sensor and select heater profile set-point 0 */
594 ret = regmap_update_bits(data->regmap, BME680_REG_CTRL_GAS_1,
595 BME680_RUN_GAS_MASK | BME680_NB_CONV_MASK,
596 FIELD_PREP(BME680_RUN_GAS_MASK, 1) |
597 FIELD_PREP(BME680_NB_CONV_MASK, 0));
599 dev_err(dev, "failed to write ctrl_gas_1 register\n");
604 static int bme680_read_temp(struct bme680_data *data, int *val)
606 struct device *dev = regmap_get_device(data->regmap);
612 /* set forced mode to trigger measurement */
613 ret = bme680_set_mode(data, true);
617 ret = regmap_bulk_read(data->regmap, BME680_REG_TEMP_MSB,
620 dev_err(dev, "failed to read temperature\n");
624 adc_temp = be32_to_cpu(tmp) >> 12;
625 if (adc_temp == BME680_MEAS_SKIPPED) {
626 /* reading was skipped */
627 dev_err(dev, "reading temperature skipped\n");
630 comp_temp = bme680_compensate_temp(data, adc_temp);
632 * val might be NULL if we're called by the read_press/read_humid
633 * routine which is callled to get t_fine value used in
634 * compensate_press/compensate_humid to get compensated
635 * pressure/humidity readings.
638 *val = comp_temp * 10; /* Centidegrees to millidegrees */
645 static int bme680_read_press(struct bme680_data *data,
648 struct device *dev = regmap_get_device(data->regmap);
653 /* Read and compensate temperature to get a reading of t_fine */
654 ret = bme680_read_temp(data, NULL);
658 ret = regmap_bulk_read(data->regmap, BME680_REG_PRESS_MSB,
661 dev_err(dev, "failed to read pressure\n");
665 adc_press = be32_to_cpu(tmp) >> 12;
666 if (adc_press == BME680_MEAS_SKIPPED) {
667 /* reading was skipped */
668 dev_err(dev, "reading pressure skipped\n");
672 *val = bme680_compensate_press(data, adc_press);
674 return IIO_VAL_FRACTIONAL;
677 static int bme680_read_humid(struct bme680_data *data,
680 struct device *dev = regmap_get_device(data->regmap);
686 /* Read and compensate temperature to get a reading of t_fine */
687 ret = bme680_read_temp(data, NULL);
691 ret = regmap_bulk_read(data->regmap, BM6880_REG_HUMIDITY_MSB,
694 dev_err(dev, "failed to read humidity\n");
698 adc_humidity = be16_to_cpu(tmp);
699 if (adc_humidity == BME680_MEAS_SKIPPED) {
700 /* reading was skipped */
701 dev_err(dev, "reading humidity skipped\n");
704 comp_humidity = bme680_compensate_humid(data, adc_humidity);
706 *val = comp_humidity;
708 return IIO_VAL_FRACTIONAL;
711 static int bme680_read_gas(struct bme680_data *data,
714 struct device *dev = regmap_get_device(data->regmap);
721 /* Set heater settings */
722 ret = bme680_gas_config(data);
724 dev_err(dev, "failed to set gas config\n");
728 /* set forced mode to trigger measurement */
729 ret = bme680_set_mode(data, true);
733 ret = regmap_read(data->regmap, BME680_REG_MEAS_STAT_0, &check);
734 if (check & BME680_GAS_MEAS_BIT) {
735 dev_err(dev, "gas measurement incomplete\n");
739 ret = regmap_read(data->regmap, BME680_REG_GAS_R_LSB, &check);
741 dev_err(dev, "failed to read gas_r_lsb register\n");
746 * occurs if either the gas heating duration was insuffient
747 * to reach the target heater temperature or the target
748 * heater temperature was too high for the heater sink to
751 if ((check & BME680_GAS_STAB_BIT) == 0) {
752 dev_err(dev, "heater failed to reach the target temperature\n");
756 ret = regmap_bulk_read(data->regmap, BME680_REG_GAS_MSB,
759 dev_err(dev, "failed to read gas resistance\n");
763 gas_range = check & BME680_GAS_RANGE_MASK;
764 adc_gas_res = be16_to_cpu(tmp) >> BME680_ADC_GAS_RES_SHIFT;
766 *val = bme680_compensate_gas(data, adc_gas_res, gas_range);
770 static int bme680_read_raw(struct iio_dev *indio_dev,
771 struct iio_chan_spec const *chan,
772 int *val, int *val2, long mask)
774 struct bme680_data *data = iio_priv(indio_dev);
777 case IIO_CHAN_INFO_PROCESSED:
778 switch (chan->type) {
780 return bme680_read_temp(data, val);
782 return bme680_read_press(data, val, val2);
783 case IIO_HUMIDITYRELATIVE:
784 return bme680_read_humid(data, val, val2);
786 return bme680_read_gas(data, val);
790 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
791 switch (chan->type) {
793 *val = data->oversampling_temp;
796 *val = data->oversampling_press;
798 case IIO_HUMIDITYRELATIVE:
799 *val = data->oversampling_humid;
809 static bool bme680_is_valid_oversampling(int rate)
811 return (rate > 0 && rate <= 16 && is_power_of_2(rate));
814 static int bme680_write_raw(struct iio_dev *indio_dev,
815 struct iio_chan_spec const *chan,
816 int val, int val2, long mask)
818 struct bme680_data *data = iio_priv(indio_dev);
824 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
826 if (!bme680_is_valid_oversampling(val))
829 switch (chan->type) {
831 data->oversampling_temp = val;
834 data->oversampling_press = val;
836 case IIO_HUMIDITYRELATIVE:
837 data->oversampling_humid = val;
843 return bme680_chip_config(data);
850 static const char bme680_oversampling_ratio_show[] = "1 2 4 8 16";
852 static IIO_CONST_ATTR(oversampling_ratio_available,
853 bme680_oversampling_ratio_show);
855 static struct attribute *bme680_attributes[] = {
856 &iio_const_attr_oversampling_ratio_available.dev_attr.attr,
860 static const struct attribute_group bme680_attribute_group = {
861 .attrs = bme680_attributes,
864 static const struct iio_info bme680_info = {
865 .read_raw = &bme680_read_raw,
866 .write_raw = &bme680_write_raw,
867 .attrs = &bme680_attribute_group,
870 static const char *bme680_match_acpi_device(struct device *dev)
872 const struct acpi_device_id *id;
874 id = acpi_match_device(dev->driver->acpi_match_table, dev);
878 return dev_name(dev);
881 int bme680_core_probe(struct device *dev, struct regmap *regmap,
884 struct iio_dev *indio_dev;
885 struct bme680_data *data;
889 ret = regmap_write(regmap, BME680_REG_SOFT_RESET,
890 BME680_CMD_SOFTRESET);
892 dev_err(dev, "Failed to reset chip\n");
896 ret = regmap_read(regmap, BME680_REG_CHIP_ID, &val);
898 dev_err(dev, "Error reading chip ID\n");
902 if (val != BME680_CHIP_ID_VAL) {
903 dev_err(dev, "Wrong chip ID, got %x expected %x\n",
904 val, BME680_CHIP_ID_VAL);
908 indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
912 if (!name && ACPI_HANDLE(dev))
913 name = bme680_match_acpi_device(dev);
915 data = iio_priv(indio_dev);
916 dev_set_drvdata(dev, indio_dev);
917 data->regmap = regmap;
918 indio_dev->dev.parent = dev;
919 indio_dev->name = name;
920 indio_dev->channels = bme680_channels;
921 indio_dev->num_channels = ARRAY_SIZE(bme680_channels);
922 indio_dev->info = &bme680_info;
923 indio_dev->modes = INDIO_DIRECT_MODE;
925 /* default values for the sensor */
926 data->oversampling_humid = 2; /* 2X oversampling rate */
927 data->oversampling_press = 4; /* 4X oversampling rate */
928 data->oversampling_temp = 8; /* 8X oversampling rate */
929 data->heater_temp = 320; /* degree Celsius */
930 data->heater_dur = 150; /* milliseconds */
932 ret = bme680_chip_config(data);
934 dev_err(dev, "failed to set chip_config data\n");
938 ret = bme680_gas_config(data);
940 dev_err(dev, "failed to set gas config data\n");
944 ret = bme680_read_calib(data, &data->bme680);
947 "failed to read calibration coefficients at probe\n");
951 return devm_iio_device_register(dev, indio_dev);
953 EXPORT_SYMBOL_GPL(bme680_core_probe);
955 MODULE_AUTHOR("Himanshu Jha <himanshujha199640@gmail.com>");
956 MODULE_DESCRIPTION("Bosch BME680 Driver");
957 MODULE_LICENSE("GPL v2");