146 lines
4.5 KiB
C
146 lines
4.5 KiB
C
/* $NetBSD: tmp121.c,v 1.7 2022/01/19 05:21:44 thorpej Exp $ */
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/*-
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* Copyright (c) 2006 Urbana-Champaign Independent Media Center.
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* Copyright (c) 2006 Garrett D'Amore.
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* All rights reserved.
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*
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* Portions of this code were written by Garrett D'Amore for the
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* Champaign-Urbana Community Wireless Network Project.
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgements:
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* This product includes software developed by the Urbana-Champaign
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* Independent Media Center.
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* This product includes software developed by Garrett D'Amore.
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* 4. Urbana-Champaign Independent Media Center's name and Garrett
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* D'Amore's name may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE URBANA-CHAMPAIGN INDEPENDENT
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* MEDIA CENTER AND GARRETT D'AMORE ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE URBANA-CHAMPAIGN INDEPENDENT
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* MEDIA CENTER OR GARRETT D'AMORE BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: tmp121.c,v 1.7 2022/01/19 05:21:44 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/kernel.h>
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#include <dev/sysmon/sysmonvar.h>
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#include <dev/spi/spivar.h>
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struct tmp121temp_softc {
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struct spi_handle *sc_sh;
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struct sysmon_envsys *sc_sme;
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envsys_data_t sc_sensor;
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};
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static int tmp121temp_match(device_t, cfdata_t, void *);
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static void tmp121temp_attach(device_t, device_t, void *);
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static void tmp121temp_refresh(struct sysmon_envsys *, envsys_data_t *);
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CFATTACH_DECL_NEW(tmp121temp, sizeof(struct tmp121temp_softc),
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tmp121temp_match, tmp121temp_attach, NULL, NULL);
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static int
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tmp121temp_match(device_t parent, cfdata_t cf, void *aux)
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{
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return 1;
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}
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static void
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tmp121temp_attach(device_t parent, device_t self, void *aux)
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{
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struct tmp121temp_softc *sc = device_private(self);
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struct spi_attach_args *sa = aux;
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int error;
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aprint_naive(": Temperature Sensor\n");
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aprint_normal(": TI TMP121 Temperature Sensor\n");
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/* configure for 10MHz */
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error = spi_configure(self, sa->sa_handle, SPI_MODE_0, 1000000);
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if (error) {
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return;
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}
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sc->sc_sh = sa->sa_handle;
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sc->sc_sme = sysmon_envsys_create();
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sc->sc_sensor.units = ENVSYS_STEMP;
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sc->sc_sensor.state = ENVSYS_SINVALID;
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strlcpy(sc->sc_sensor.desc, device_xname(self),
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sizeof(sc->sc_sensor.desc));
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if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor)) {
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sysmon_envsys_destroy(sc->sc_sme);
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return;
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}
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sc->sc_sme->sme_name = device_xname(self);
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sc->sc_sme->sme_refresh = tmp121temp_refresh;
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sc->sc_sme->sme_cookie = sc;
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if (sysmon_envsys_register(sc->sc_sme)) {
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aprint_error_dev(self, "unable to register with sysmon\n");
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sysmon_envsys_destroy(sc->sc_sme);
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}
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}
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static void
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tmp121temp_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
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{
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struct tmp121temp_softc *sc = sme->sme_cookie;
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uint16_t reg;
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int16_t sreg;
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int val;
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if (spi_recv(sc->sc_sh, 2, (uint8_t *)®) != 0) {
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edata->state = ENVSYS_SINVALID;
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return;
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}
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sreg = (int16_t)be16toh(reg);
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/*
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* convert to uK:
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*
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* TMP121 bits:
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* D15 : sign bit
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* D14-D3 : data (D14 is MSB)
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* D2-D0 : zero
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*
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* The data is represented in units of 0.0625 deg C.
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*/
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sreg >>= 3;
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val = sreg * 62500 + 273150000;
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edata->value_cur = val;
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edata->state = ENVSYS_SVALID;
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}
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