1 // SPDX-License-Identifier: GPL-2.0+
4  * The DPS310 is a barometric pressure and temperature sensor.
5  * Currently only reading a single temperature is supported by
10  * Temperature calculation:
14  *  - Optionally support the FIFO
119 	rc = regmap_bulk_read(data->regmap, DPS310_COEF_BASE, coef,  in dps310_get_coefs()
125 	 * Calculate temperature calibration coefficients c0 and c1. The  in dps310_get_coefs()
126 	 * numbers are 12-bit 2's complement numbers.  in dps310_get_coefs()
129 	data->c0 = sign_extend32(c0, 11);  in dps310_get_coefs()
132 	data->c1 = sign_extend32(c1, 11);  in dps310_get_coefs()
140 	data->c00 = sign_extend32(c00, 19);  in dps310_get_coefs()
143 	data->c10 = sign_extend32(c10, 19);  in dps310_get_coefs()
146 	data->c01 = sign_extend32(c01, 15);  in dps310_get_coefs()
149 	data->c11 = sign_extend32(c11, 15);  in dps310_get_coefs()
152 	data->c20 = sign_extend32(c20, 15);  in dps310_get_coefs()
155 	data->c21 = sign_extend32(c21, 15);  in dps310_get_coefs()
158 	data->c30 = sign_extend32(c30, 15);  in dps310_get_coefs()
173 	rc = regmap_read(data->regmap, 0x32, &reg);  in dps310_temp_workaround()
184 	rc = regmap_write(data->regmap, 0x0e, 0xA5);  in dps310_temp_workaround()
188 	rc = regmap_write(data->regmap, 0x0f, 0x96);  in dps310_temp_workaround()
192 	rc = regmap_write(data->regmap, 0x62, 0x02);  in dps310_temp_workaround()
196 	rc = regmap_write(data->regmap, 0x0e, 0x00);  in dps310_temp_workaround()
200 	return regmap_write(data->regmap, 0x0f, 0x00);  in dps310_temp_workaround()
212 	rc = regmap_write(data->regmap, DPS310_PRS_CFG, 0);  in dps310_startup()
217 	 * Set up external (MEMS) temperature sensor in single sample, one  in dps310_startup()
220 	rc = regmap_write(data->regmap, DPS310_TMP_CFG, DPS310_TMP_EXT);  in dps310_startup()
225 	rc = regmap_write_bits(data->regmap, DPS310_CFG_REG,  in dps310_startup()
231 	rc = regmap_write_bits(data->regmap, DPS310_MEAS_CFG,  in dps310_startup()
236 	/* Turn on temperature and pressure measurement in the background */  in dps310_startup()
237 	rc = regmap_write_bits(data->regmap, DPS310_MEAS_CFG,  in dps310_startup()
244 	 * Calibration coefficients required for reporting temperature.  in dps310_startup()
247 	rc = regmap_read_poll_timeout(data->regmap, DPS310_MEAS_CFG, ready,  in dps310_startup()
263 	rc = regmap_read(data->regmap, DPS310_PRS_CFG, &reg_val);  in dps310_get_pres_precision()
276 	rc = regmap_read(data->regmap, DPS310_TMP_CFG, &reg_val);  in dps310_get_temp_precision()
296 		return -EINVAL;  in dps310_set_pres_precision()
299 	rc = regmap_write_bits(data->regmap, DPS310_CFG_REG,  in dps310_set_pres_precision()
304 	return regmap_update_bits(data->regmap, DPS310_PRS_CFG,  in dps310_set_pres_precision()
315 		return -EINVAL;  in dps310_set_temp_precision()
318 	rc = regmap_write_bits(data->regmap, DPS310_CFG_REG,  in dps310_set_temp_precision()
323 	return regmap_update_bits(data->regmap, DPS310_TMP_CFG,  in dps310_set_temp_precision()
333 		return -EINVAL;  in dps310_set_pres_samp_freq()
337 	return regmap_update_bits(data->regmap, DPS310_PRS_CFG,  in dps310_set_pres_samp_freq()
347 		return -EINVAL;  in dps310_set_temp_samp_freq()
351 	return regmap_update_bits(data->regmap, DPS310_TMP_CFG,  in dps310_set_temp_samp_freq()
359 	rc = regmap_read(data->regmap, DPS310_PRS_CFG, &reg_val);  in dps310_get_pres_samp_freq()
372 	rc = regmap_read(data->regmap, DPS310_TMP_CFG, &reg_val);  in dps310_get_temp_samp_freq()
385 	rc = regmap_read(data->regmap, DPS310_PRS_CFG, &reg_val);  in dps310_get_pres_k()
398 	rc = regmap_read(data->regmap, DPS310_TMP_CFG, &reg_val);  in dps310_get_temp_k()
411 	rc = regmap_write(data->regmap, DPS310_RESET, DPS310_RESET_MAGIC);  in dps310_reset_wait()
436 	return regmap_read_poll_timeout(data->regmap, DPS310_MEAS_CFG, ready, ready & ready_bit,  in dps310_ready_status()
446 		if (rc == -ETIMEDOUT && !data->timeout_recovery_failed) {  in dps310_ready()
449 				data->timeout_recovery_failed = true;  in dps310_ready()
453 					data->timeout_recovery_failed = true;  in dps310_ready()
462 	data->timeout_recovery_failed = false;  in dps310_ready()
474 	if (mutex_lock_interruptible(&data->lock))  in dps310_read_pres_raw()
475 		return -EINTR;  in dps310_read_pres_raw()
488 	rc = regmap_bulk_read(data->regmap, DPS310_PRS_BASE, val, sizeof(val));  in dps310_read_pres_raw()
493 	data->pressure_raw = sign_extend32(raw, 23);  in dps310_read_pres_raw()
496 	mutex_unlock(&data->lock);  in dps310_read_pres_raw()
507 	rc = regmap_bulk_read(data->regmap, DPS310_TMP_BASE, val, sizeof(val));  in dps310_read_temp_ready()
512 	data->temp_raw = sign_extend32(raw, 23);  in dps310_read_temp_ready()
523 	if (mutex_lock_interruptible(&data->lock))  in dps310_read_temp_raw()
524 		return -EINTR;  in dps310_read_temp_raw()
540 	mutex_unlock(&data->lock);  in dps310_read_temp_raw()
586 	if (mutex_lock_interruptible(&data->lock))  in dps310_write_raw()
587 		return -EINTR;  in dps310_write_raw()
591 		switch (chan->type) {  in dps310_write_raw()
601 			rc = -EINVAL;  in dps310_write_raw()
607 		switch (chan->type) {  in dps310_write_raw()
617 			rc = -EINVAL;  in dps310_write_raw()
623 		rc = -EINVAL;  in dps310_write_raw()
627 	mutex_unlock(&data->lock);  in dps310_write_raw()
660 	if (mutex_trylock(&data->lock)) {  in dps310_calculate_pressure()
661 		rc = regmap_read(data->regmap, DPS310_MEAS_CFG, &t_ready);  in dps310_calculate_pressure()
665 		mutex_unlock(&data->lock);  in dps310_calculate_pressure()
668 	p = (s64)data->pressure_raw;  in dps310_calculate_pressure()
669 	t = (s64)data->temp_raw;  in dps310_calculate_pressure()
672 	nums[0] = (s64)data->c00;  in dps310_calculate_pressure()
674 	nums[1] = p * (s64)data->c10;  in dps310_calculate_pressure()
676 	nums[2] = p * p * (s64)data->c20;  in dps310_calculate_pressure()
678 	nums[3] = p * p * p * (s64)data->c30;  in dps310_calculate_pressure()
680 	nums[4] = t * (s64)data->c01;  in dps310_calculate_pressure()
682 	nums[5] = t * p * (s64)data->c11;  in dps310_calculate_pressure()
684 	nums[6] = t * p * p * (s64)data->c21;  in dps310_calculate_pressure()
692 			pressure -= div64_u64_rem(-nums[i], denoms[i], &irem);  in dps310_calculate_pressure()
693 			rems[i] = -irem;  in dps310_calculate_pressure()
706 		return -ERANGE;  in dps310_calculate_pressure()
745 		return -EINVAL;  in dps310_read_pressure()
759 	/* Obtain inverse-scaled offset */  in dps310_calculate_temp()
760 	c0 = div_s64((s64)kt * (s64)data->c0, 2);  in dps310_calculate_temp()
762 	/* Add the offset to the unscaled temperature */  in dps310_calculate_temp()
763 	t = c0 + ((s64)data->temp_raw * (s64)data->c1);  in dps310_calculate_temp()
765 	/* Convert to milliCelsius and scale the temperature */  in dps310_calculate_temp()
803 		return -EINVAL;  in dps310_read_temp()
813 	switch (chan->type) {  in dps310_read_raw()
821 		return -EINVAL;  in dps310_read_raw()
853 	iio = devm_iio_device_alloc(&client->dev,  sizeof(*data));  in dps310_probe()
855 		return -ENOMEM;  in dps310_probe()
858 	data->client = client;  in dps310_probe()
859 	mutex_init(&data->lock);  in dps310_probe()
861 	iio->name = id->name;  in dps310_probe()
862 	iio->channels = dps310_channels;  in dps310_probe()
863 	iio->num_channels = ARRAY_SIZE(dps310_channels);  in dps310_probe()
864 	iio->info = &dps310_info;  in dps310_probe()
865 	iio->modes = INDIO_DIRECT_MODE;  in dps310_probe()
867 	data->regmap = devm_regmap_init_i2c(client, &dps310_regmap_config);  in dps310_probe()
868 	if (IS_ERR(data->regmap))  in dps310_probe()
869 		return PTR_ERR(data->regmap);  in dps310_probe()
872 	rc = devm_add_action_or_reset(&client->dev, dps310_reset, data);  in dps310_probe()
880 	rc = devm_iio_device_register(&client->dev, iio);  in dps310_probe()
912 MODULE_DESCRIPTION("Infineon DPS310 pressure and temperature sensor");