1 // SPDX-License-Identifier: GPL-2.0+
3  * hdc3020.c - Support for the TI HDC3020,HDC3021 and HDC3022
8  * Copyright (C) 2024 Liebherr-Electronics and Drives GmbH
70 #define HDC3020_MIN_TEMP_MICRO		-39872968
88 static const int hdc3020_heater_vals[] = {0, 1, 0x3FFF};
137 static int hdc3020_write_bytes(struct hdc3020_data *data, u8 *buf, u8 len)  in hdc3020_write_bytes()
139 	struct i2c_client *client = data->client;  in hdc3020_write_bytes()
141 	int ret, cnt;  in hdc3020_write_bytes()
143 	msg.addr = client->addr;  in hdc3020_write_bytes()
153 		ret = i2c_transfer(client->adapter, &msg, 1);  in hdc3020_write_bytes()
159 	dev_err(&client->dev, "Could not write sensor command\n");  in hdc3020_write_bytes()
161 	return -ETIMEDOUT;  in hdc3020_write_bytes()
165 int hdc3020_read_bytes(struct hdc3020_data *data, u16 reg, u8 *buf, int len)  in hdc3020_read_bytes()
168 	int ret, cnt;  in hdc3020_read_bytes()
169 	struct i2c_client *client = data->client;  in hdc3020_read_bytes()
172 			.addr = client->addr,  in hdc3020_read_bytes()
178 			.addr = client->addr,  in hdc3020_read_bytes()
191 		ret = i2c_transfer(client->adapter, msg, 2);  in hdc3020_read_bytes()
197 	dev_err(&client->dev, "Could not read sensor data\n");  in hdc3020_read_bytes()
199 	return -ETIMEDOUT;  in hdc3020_read_bytes()
202 static int hdc3020_read_be16(struct hdc3020_data *data, u16 reg)  in hdc3020_read_be16()
205 	int ret;  in hdc3020_read_be16()
213 		return -EINVAL;  in hdc3020_read_be16()
218 static int hdc3020_exec_cmd(struct hdc3020_data *data, u16 reg)  in hdc3020_exec_cmd()
226 static int hdc3020_read_measurement(struct hdc3020_data *data,  in hdc3020_read_measurement()
227 				    enum iio_chan_type type, int *val)  in hdc3020_read_measurement()
230 	int ret;  in hdc3020_read_measurement()
239 		return -EINVAL;  in hdc3020_read_measurement()
244 		return -EINVAL;  in hdc3020_read_measurement()
251 		return -EINVAL;  in hdc3020_read_measurement()
256 static int hdc3020_read_raw(struct iio_dev *indio_dev,  in hdc3020_read_raw()
257 			    struct iio_chan_spec const *chan, int *val,  in hdc3020_read_raw()
258 			    int *val2, long mask)  in hdc3020_read_raw()
261 	int ret;  in hdc3020_read_raw()
263 	if (chan->type != IIO_TEMP && chan->type != IIO_HUMIDITYRELATIVE)  in hdc3020_read_raw()
264 		return -EINVAL;  in hdc3020_read_raw()
268 		guard(mutex)(&data->lock);  in hdc3020_read_raw()
269 		ret = hdc3020_read_measurement(data, chan->type, val);  in hdc3020_read_raw()
276 		guard(mutex)(&data->lock);  in hdc3020_read_raw()
277 		if (chan->type == IIO_TEMP)  in hdc3020_read_raw()
289 		guard(mutex)(&data->lock);  in hdc3020_read_raw()
290 		if (chan->type == IIO_TEMP)  in hdc3020_read_raw()
303 		if (chan->type == IIO_TEMP)  in hdc3020_read_raw()
310 		if (chan->type != IIO_TEMP)  in hdc3020_read_raw()
311 			return -EINVAL;  in hdc3020_read_raw()
313 		*val = -16852;  in hdc3020_read_raw()
317 		return -EINVAL;  in hdc3020_read_raw()
321 static int hdc3020_read_available(struct iio_dev *indio_dev,  in hdc3020_read_available()
323 				  const int **vals,  in hdc3020_read_available()
324 				  int *type, int *length, long mask)  in hdc3020_read_available()
326 	if (mask != IIO_CHAN_INFO_RAW || chan->type != IIO_CURRENT)  in hdc3020_read_available()
327 		return -EINVAL;  in hdc3020_read_available()
335 static int hdc3020_update_heater(struct hdc3020_data *data, int val)  in hdc3020_update_heater()
338 	int ret;  in hdc3020_update_heater()
341 		return -EINVAL;  in hdc3020_update_heater()
356 static int hdc3020_write_raw(struct iio_dev *indio_dev,  in hdc3020_write_raw()
358 			     int val, int val2, long mask)  in hdc3020_write_raw()
364 		if (chan->type != IIO_CURRENT)  in hdc3020_write_raw()
365 			return -EINVAL;  in hdc3020_write_raw()
367 		guard(mutex)(&data->lock);  in hdc3020_write_raw()
371 	return -EINVAL;  in hdc3020_write_raw()
374 static int hdc3020_thresh_get_temp(u16 thresh)  in hdc3020_thresh_get_temp()
376 	int temp;  in hdc3020_thresh_get_temp()
379 	 * Get the temperature threshold from 9 LSBs, shift them to get  in hdc3020_thresh_get_temp()
380 	 * the truncated temperature threshold representation and  in hdc3020_thresh_get_temp()
381 	 * calculate the threshold according to the formula in the  in hdc3020_thresh_get_temp()
387 	return -2949075 + (175 * temp);  in hdc3020_thresh_get_temp()
390 static int hdc3020_thresh_get_hum(u16 thresh)  in hdc3020_thresh_get_hum()
392 	int hum;  in hdc3020_thresh_get_hum()
395 	 * Get the humidity threshold from 7 MSBs, shift them to get the  in hdc3020_thresh_get_hum()
396 	 * truncated humidity threshold representation and calculate the  in hdc3020_thresh_get_hum()
397 	 * threshold according to the formula in the datasheet. Result is  in hdc3020_thresh_get_hum()
406 static u16 hdc3020_thresh_set_temp(int s_temp, u16 curr_thresh)  in hdc3020_thresh_set_temp()
412 	 * Calculate temperature threshold, shift it down to get the  in hdc3020_thresh_set_temp()
413 	 * truncated threshold representation in the 9LSBs while keeping  in hdc3020_thresh_set_temp()
414 	 * the current humidity threshold in the 7 MSBs.  in hdc3020_thresh_set_temp()
425 static u16 hdc3020_thresh_set_hum(int s_hum, u16 curr_thresh)  in hdc3020_thresh_set_hum()
431 	 * Calculate humidity threshold, shift it down and up to get the  in hdc3020_thresh_set_hum()
432 	 * truncated threshold representation in the 7MSBs while keeping  in hdc3020_thresh_set_hum()
433 	 * the current temperature threshold in the 9 LSBs.  in hdc3020_thresh_set_hum()
444 int hdc3020_thresh_clr(s64 s_thresh, s64 s_hyst, enum iio_event_direction dir)  in hdc3020_thresh_clr()
454 		s_clr = s_thresh - s_hyst;  in hdc3020_thresh_clr()
462 static int _hdc3020_write_thresh(struct hdc3020_data *data, u16 reg, u16 val)  in _hdc3020_write_thresh()
473 static int hdc3020_write_thresh(struct iio_dev *indio_dev,  in hdc3020_write_thresh()
478 				int val, int val2)  in hdc3020_write_thresh()
483 	int s_val, thresh, clr, ret;  in hdc3020_write_thresh()
485 	/* Select threshold registers */  in hdc3020_write_thresh()
498 	guard(mutex)(&data->lock);  in hdc3020_write_thresh()
510 	s_val = (val < 0) ? (val * 1000000 - val2) : (val * 1000000 + val2);  in hdc3020_write_thresh()
511 	switch (chan->type) {  in hdc3020_write_thresh()
526 			s_hyst = div_s64(abs(s_thresh - s_clr), 65535);  in hdc3020_write_thresh()
527 			/* Set new threshold */  in hdc3020_write_thresh()
552 			return -EOPNOTSUPP;  in hdc3020_write_thresh()
568 			s_hyst = div_s64(abs(s_thresh - s_clr), 65535);  in hdc3020_write_thresh()
569 			/* Set new threshold */  in hdc3020_write_thresh()
593 			return -EOPNOTSUPP;  in hdc3020_write_thresh()
597 		return -EOPNOTSUPP;  in hdc3020_write_thresh()
603 static int hdc3020_read_thresh(struct iio_dev *indio_dev,  in hdc3020_read_thresh()
608 			       int *val, int *val2)  in hdc3020_read_thresh()
612 	int thresh, clr, ret;  in hdc3020_read_thresh()
614 	/* Select threshold registers */  in hdc3020_read_thresh()
623 	guard(mutex)(&data->lock);  in hdc3020_read_thresh()
628 	switch (chan->type) {  in hdc3020_read_thresh()
641 			*val = abs(thresh - clr);  in hdc3020_read_thresh()
644 			return -EOPNOTSUPP;  in hdc3020_read_thresh()
660 			*val = abs(thresh - clr);  in hdc3020_read_thresh()
663 			return -EOPNOTSUPP;  in hdc3020_read_thresh()
668 		return -EOPNOTSUPP;  in hdc3020_read_thresh()
672 static irqreturn_t hdc3020_interrupt_handler(int irq, void *private)  in hdc3020_interrupt_handler()
677 	int ret;  in hdc3020_interrupt_handler()
732 static int hdc3020_power_off(struct hdc3020_data *data)  in hdc3020_power_off()
736 	if (data->reset_gpio)  in hdc3020_power_off()
737 		gpiod_set_value_cansleep(data->reset_gpio, 1);  in hdc3020_power_off()
739 	return regulator_disable(data->vdd_supply);  in hdc3020_power_off()
742 static int hdc3020_power_on(struct hdc3020_data *data)  in hdc3020_power_on()
744 	int ret;  in hdc3020_power_on()
746 	ret = regulator_enable(data->vdd_supply);  in hdc3020_power_on()
752 	if (data->reset_gpio) {  in hdc3020_power_on()
753 		gpiod_set_value_cansleep(data->reset_gpio, 0);  in hdc3020_power_on()
757 	if (data->client->irq) {  in hdc3020_power_on()
781 static int hdc3020_probe(struct i2c_client *client)  in hdc3020_probe()
785 	int ret;  in hdc3020_probe()
787 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))  in hdc3020_probe()
788 		return -EOPNOTSUPP;  in hdc3020_probe()
790 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));  in hdc3020_probe()
792 		return -ENOMEM;  in hdc3020_probe()
794 	dev_set_drvdata(&client->dev, indio_dev);  in hdc3020_probe()
797 	data->client = client;  in hdc3020_probe()
798 	mutex_init(&data->lock);  in hdc3020_probe()
802 	indio_dev->name = "hdc3020";  in hdc3020_probe()
803 	indio_dev->modes = INDIO_DIRECT_MODE;  in hdc3020_probe()
804 	indio_dev->info = &hdc3020_info;  in hdc3020_probe()
805 	indio_dev->channels = hdc3020_channels;  in hdc3020_probe()
806 	indio_dev->num_channels = ARRAY_SIZE(hdc3020_channels);  in hdc3020_probe()
808 	data->vdd_supply = devm_regulator_get(&client->dev, "vdd");  in hdc3020_probe()
809 	if (IS_ERR(data->vdd_supply))  in hdc3020_probe()
810 		return dev_err_probe(&client->dev, PTR_ERR(data->vdd_supply),  in hdc3020_probe()
813 	data->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",  in hdc3020_probe()
815 	if (IS_ERR(data->reset_gpio))  in hdc3020_probe()
816 		return dev_err_probe(&client->dev, PTR_ERR(data->reset_gpio),  in hdc3020_probe()
821 		return dev_err_probe(&client->dev, ret, "Power on failed\n");  in hdc3020_probe()
823 	ret = devm_add_action_or_reset(&data->client->dev, hdc3020_exit, data);  in hdc3020_probe()
827 	if (client->irq) {  in hdc3020_probe()
828 		ret = devm_request_threaded_irq(&client->dev, client->irq,  in hdc3020_probe()
833 			return dev_err_probe(&client->dev, ret,  in hdc3020_probe()
837 	ret = devm_iio_device_register(&data->client->dev, indio_dev);  in hdc3020_probe()
839 		return dev_err_probe(&client->dev, ret, "Failed to add device");  in hdc3020_probe()
844 static int hdc3020_suspend(struct device *dev)  in hdc3020_suspend()
852 static int hdc3020_resume(struct device *dev)  in hdc3020_resume()