1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
50  * Driver for HTU21D and compatible temperature and humidity sensors.
52  * - Measurement Specialties HTU21D datasheet,
53  * - Sensirion SHT21 datasheet,
54  * - Silicon Labs Si7021 datasheet,
55  * - HTU2X Serial Number Reading application note,
56  * - Sensirion Electronic Identification Code (How to read-out the serial number
132 	msgs[0].slave = sc->sc_addr;  in htu21_get_measurement()
137 	msgs[1].slave = sc->sc_addr;  in htu21_get_measurement()
157 	msgs[0].slave = sc->sc_addr;  in htu21_get_measurement_nohold()
162 	msgs[1].slave = sc->sc_addr;  in htu21_get_measurement_nohold()
193 	if (req->oldptr != NULL) {  in htu21_temp_sysctl()
194 		if (sc->sc_hold)  in htu21_temp_sysctl()
204 			temp = -1;  in htu21_temp_sysctl()
205 			sc->sc_errcount++;  in htu21_temp_sysctl()
209 			temp = ((temp * 17572) >> 16 ) + 27315 - 4685;  in htu21_temp_sysctl()
228 	if (req->oldptr != NULL) {  in htu21_rh_sysctl()
229 		if (sc->sc_hold)  in htu21_rh_sysctl()
239 			rh = -1;  in htu21_rh_sysctl()
240 			sc->sc_errcount++;  in htu21_rh_sysctl()
244 			rh = ((rh * 12500) >> 16 ) - 600;  in htu21_rh_sysctl()
263 	msgs[0].slave = sc->sc_addr;  in htu21_get_cfg()
268 	msgs[1].slave = sc->sc_addr;  in htu21_get_cfg()
289 	msg.slave = sc->sc_addr;  in htu21_set_cfg()
307 	if (req->oldptr != NULL) {  in htu21_heater_sysctl()
314 	if (error != 0 || req->newptr == NULL)  in htu21_heater_sysctl()
332 	if (req->oldptr != NULL) {  in htu21_power_sysctl()
359 	msgs[0].slave = sc->sc_addr;  in htu21_get_serial()
364 	msgs[1].slave = sc->sc_addr;  in htu21_get_serial()
377 		sc->sc_serial[2 + i / 2] = data[i];  in htu21_get_serial()
382 	msgs[0].slave = sc->sc_addr;  in htu21_get_serial()
387 	msgs[1].slave = sc->sc_addr;  in htu21_get_serial()
398 	sc->sc_serial[6] = data[0];  in htu21_get_serial()
399 	sc->sc_serial[7] = data[1];  in htu21_get_serial()
403 	sc->sc_serial[0] = data[3];  in htu21_get_serial()
404 	sc->sc_serial[1] = data[4];  in htu21_get_serial()
420 	dev = sc->sc_dev;  in htu21_start()
429 		    sc->sc_serial, ":", error == 0 ? "" : "in");  in htu21_start()
442 	SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "humidity",  in htu21_start()
444 	    htu21_rh_sysctl, "I", "Relative humidity in 0.01%% units");  in htu21_start()
447 	    htu21_heater_sysctl, "IU", "Enable built-in heater");  in htu21_start()
450 	    htu21_power_sysctl, "IU", "If sensor's power is good");  in htu21_start()
452 	    CTLFLAG_RW, &sc->sc_hold, 0,  in htu21_start()
455 	    CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, &sc->sc_errcount, 0,  in htu21_start()
468 	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data)  in htu21_probe()
476 		device_printf(dev, "non-standard slave address 0x%02x\n",  in htu21_probe()
480 	device_set_desc(dev, "HTU21 temperature and humidity sensor");  in htu21_probe()
490 	sc->sc_dev = dev;  in htu21_attach()
491 	sc->sc_addr = iicbus_get_addr(dev);  in htu21_attach()