1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * MPRLS0025PA - Honeywell MicroPressure pressure sensor series driver
5  * Copyright (c) Andreas Klinger <ak@it-klinger.de>
8 …-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/bo…
45  * pressure = (press_cnt - outputmin) * scale + pmin
47  * * pressure	- measured pressure in Pascal
48  * * press_cnt	- raw value read from sensor
49  * * pmin	- minimum pressure range value of sensor (data->pmin)
50  * * pmax	- maximum pressure range value of sensor (data->pmax)
51  * * outputmin	- minimum numerical range raw value delivered by sensor
53  * * outputmax	- maximum numerical range raw value delivered by sensor
55  * * scale	- (pmax - pmin) / (outputmax - outputmin)
58  * pressure = (raw + offset) * scale
61  * * raw	- press_cnt
62  * * offset	- (-1 * outputmin) - pmin / scale
63  *                note: With all sensors from the datasheet pmin = 0
64  *                which reduces the offset to (-1 * outputmin)
110  * struct mpr_range_config - list of pressure ranges based on nomenclature
111  * @pmin: lowest pressure that can be measured
112  * @pmax: highest pressure that can be measured
174 	if (data->gpiod_reset) {  in mpr_reset()
175 		gpiod_set_value(data->gpiod_reset, 0);  in mpr_reset()
177 		gpiod_set_value(data->gpiod_reset, 1);  in mpr_reset()
182  * mpr_read_pressure() - Read pressure value from sensor
191  * Context: The function can sleep and data->lock should be held when calling it
193  * * 0		- OK, the pressure value could be read
194  * * -ETIMEDOUT	- Timeout while waiting for the EOC interrupt or busy flag is
199 	struct device *dev = data->dev;  in mpr_read_pressure()
203 	reinit_completion(&data->completion);  in mpr_read_pressure()
205 	ret = data->ops->write(data, MPR_CMD_SYNC, MPR_PKT_SYNC_LEN);  in mpr_read_pressure()
211 	if (data->irq > 0) {  in mpr_read_pressure()
212 		ret = wait_for_completion_timeout(&data->completion, HZ);  in mpr_read_pressure()
215 			return -ETIMEDOUT;  in mpr_read_pressure()
223 			 * --> let's try it nloops (10) times which seems to be  in mpr_read_pressure()
227 			ret = data->ops->read(data, MPR_CMD_NOP, 1);  in mpr_read_pressure()
234 			if (!(data->buffer[0] & MPR_ST_ERR_FLAG))  in mpr_read_pressure()
239 			return -ETIMEDOUT;  in mpr_read_pressure()
243 	ret = data->ops->read(data, MPR_CMD_NOP, MPR_PKT_NOP_LEN);  in mpr_read_pressure()
247 	if (data->buffer[0] & MPR_ST_ERR_FLAG) {  in mpr_read_pressure()
248 		dev_err(data->dev,  in mpr_read_pressure()
249 			"unexpected status byte %02x\n", data->buffer[0]);  in mpr_read_pressure()
250 		return -ETIMEDOUT;  in mpr_read_pressure()
253 	*press = get_unaligned_be24(&data->buffer[1]);  in mpr_read_pressure()
255 	dev_dbg(dev, "received: %*ph cnt: %d\n", ret, data->buffer, *press);  in mpr_read_pressure()
264 	complete(&data->completion);  in mpr_eoc_handler()
273 	struct iio_dev *indio_dev = pf->indio_dev;  in mpr_trigger_handler()
276 	mutex_lock(&data->lock);  in mpr_trigger_handler()
277 	ret = mpr_read_pressure(data, &data->chan.pres);  in mpr_trigger_handler()
281 	iio_push_to_buffers_with_timestamp(indio_dev, &data->chan,  in mpr_trigger_handler()
285 	mutex_unlock(&data->lock);  in mpr_trigger_handler()
286 	iio_trigger_notify_done(indio_dev->trig);  in mpr_trigger_handler()
295 	s32 pressure;  in mpr_read_raw()  local
298 	if (chan->type != IIO_PRESSURE)  in mpr_read_raw()
299 		return -EINVAL;  in mpr_read_raw()
303 		mutex_lock(&data->lock);  in mpr_read_raw()
304 		ret = mpr_read_pressure(data, &pressure);  in mpr_read_raw()
305 		mutex_unlock(&data->lock);  in mpr_read_raw()
308 		*val = pressure;  in mpr_read_raw()
311 		*val = data->scale;  in mpr_read_raw()
312 		*val2 = data->scale2;  in mpr_read_raw()
315 		*val = data->offset;  in mpr_read_raw()
316 		*val2 = data->offset2;  in mpr_read_raw()
319 		return -EINVAL;  in mpr_read_raw()
338 		return -ENOMEM;  in mpr_common_probe()
341 	data->dev = dev;  in mpr_common_probe()
342 	data->ops = ops;  in mpr_common_probe()
343 	data->irq = irq;  in mpr_common_probe()
345 	mutex_init(&data->lock);  in mpr_common_probe()
346 	init_completion(&data->completion);  in mpr_common_probe()
348 	indio_dev->name = "mprls0025pa";  in mpr_common_probe()
349 	indio_dev->info = &mpr_info;  in mpr_common_probe()
350 	indio_dev->channels = mpr_channels;  in mpr_common_probe()
351 	indio_dev->num_channels = ARRAY_SIZE(mpr_channels);  in mpr_common_probe()
352 	indio_dev->modes = INDIO_DIRECT_MODE;  in mpr_common_probe()
359 	ret = data->ops->init(data->dev);  in mpr_common_probe()
364 				       "honeywell,transfer-function", &func);  in mpr_common_probe()
367 			     "honeywell,transfer-function could not be read\n");  in mpr_common_probe()
368 	data->function = func - 1;  in mpr_common_probe()
369 	if (data->function > MPR_FUNCTION_C)  in mpr_common_probe()
370 		return dev_err_probe(dev, -EINVAL,  in mpr_common_probe()
371 				     "honeywell,transfer-function %d invalid\n",  in mpr_common_probe()
372 				     data->function);  in mpr_common_probe()
374 	ret = device_property_read_string(dev, "honeywell,pressure-triplet",  in mpr_common_probe()
377 		ret = device_property_read_u32(dev, "honeywell,pmin-pascal",  in mpr_common_probe()
378 					       &data->pmin);  in mpr_common_probe()
381 				   "honeywell,pmin-pascal could not be read\n");  in mpr_common_probe()
383 		ret = device_property_read_u32(dev, "honeywell,pmax-pascal",  in mpr_common_probe()
384 					       &data->pmax);  in mpr_common_probe()
387 				   "honeywell,pmax-pascal could not be read\n");  in mpr_common_probe()
390 						   "honeywell,pressure-triplet",  in mpr_common_probe()
394 			return dev_err_probe(dev, -EINVAL,  in mpr_common_probe()
395 				     "honeywell,pressure-triplet is invalid\n");  in mpr_common_probe()
397 		data->pmin = mpr_range_config[ret].pmin;  in mpr_common_probe()
398 		data->pmax = mpr_range_config[ret].pmax;  in mpr_common_probe()
401 	if (data->pmin >= data->pmax)  in mpr_common_probe()
402 		return dev_err_probe(dev, -EINVAL,  in mpr_common_probe()
403 				     "pressure limits are invalid\n");  in mpr_common_probe()
405 	data->outmin = mpr_func_spec[data->function].output_min;  in mpr_common_probe()
406 	data->outmax = mpr_func_spec[data->function].output_max;  in mpr_common_probe()
409 	scale = div_s64(((s64)(data->pmax - data->pmin)) * NANO,  in mpr_common_probe()
410 			data->outmax - data->outmin);  in mpr_common_probe()
411 	data->scale = div_s64_rem(scale, NANO, &data->scale2);  in mpr_common_probe()
416 	offset = ((-1LL) * (s64)data->outmin) * NANO -  in mpr_common_probe()
417 		  div_s64(div_s64((s64)data->pmin * NANO, scale), NANO);  in mpr_common_probe()
418 	data->offset = div_s64_rem(offset, NANO, &data->offset2);  in mpr_common_probe()
420 	if (data->irq > 0) {  in mpr_common_probe()
421 		ret = devm_request_irq(dev, data->irq, mpr_eoc_handler,  in mpr_common_probe()
427 					  "request irq %d failed\n", data->irq);  in mpr_common_probe()
430 	data->gpiod_reset = devm_gpiod_get_optional(dev, "reset",  in mpr_common_probe()
432 	if (IS_ERR(data->gpiod_reset))  in mpr_common_probe()
433 		return dev_err_probe(dev, PTR_ERR(data->gpiod_reset),  in mpr_common_probe()
434 				     "request reset-gpio failed\n");  in mpr_common_probe()
453 MODULE_AUTHOR("Andreas Klinger <ak@it-klinger.de>");
454 MODULE_DESCRIPTION("Honeywell MPR pressure sensor core driver");