153 lines
4.3 KiB
C
153 lines
4.3 KiB
C
/* $NetBSD: dstemp.c,v 1.4 2018/06/26 06:03:57 thorpej Exp $ */
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/*-
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* Copyright (c) 2018 Michael Lorenz
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 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 copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, 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 ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: dstemp.c,v 1.4 2018/06/26 06:03:57 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/conf.h>
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#include <sys/bus.h>
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#include <dev/i2c/i2cvar.h>
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#include <dev/sysmon/sysmonvar.h>
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#ifdef macppc
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#define HAVE_OF 1
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#endif
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#ifdef HAVE_OF
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#include <dev/ofw/openfirm.h>
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#endif
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#define DSTEMP_CMD_START 0x51 /* command, no data */
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#define DSTEMP_CMD_POR 0x54 /* command, no data */
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#define DSTEMP_CMD_STOP 0x22 /* command, no data */
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#define DSTEMP_TCURRENT 0xaa /* current temperature, 2 bytes */
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#define DSTEMP_THIGH 0xa1 /* high threshold, 2 bytes */
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#define DSTEMP_TLOW 0xa2 /* low threshold, 2 bytes */
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#define DSTEMP_CONFIG 0xac /* 1 byte */
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struct dstemp_softc {
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device_t sc_dev;
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i2c_tag_t sc_i2c;
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i2c_addr_t sc_addr;
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struct sysmon_envsys *sc_sme;
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envsys_data_t sc_sensor_temp;
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};
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static int dstemp_match(device_t, cfdata_t, void *);
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static void dstemp_attach(device_t, device_t, void *);
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static void dstemp_sensors_refresh(struct sysmon_envsys *, envsys_data_t *);
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CFATTACH_DECL_NEW(dstemp, sizeof(struct dstemp_softc),
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dstemp_match, dstemp_attach, NULL, NULL);
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static const struct device_compatible_entry compat_data[] = {
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{ "ds1631", 0 },
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{ NULL, 0 }
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};
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static int
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dstemp_match(device_t parent, cfdata_t match, void *aux)
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{
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struct i2c_attach_args *ia = aux;
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int match_result;
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if (iic_use_direct_match(ia, match, compat_data, &match_result))
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return match_result;
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if ((ia->ia_addr & 0xf8) == 0x48)
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return I2C_MATCH_ADDRESS_ONLY;
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return 0;
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}
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static void
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dstemp_attach(device_t parent, device_t self, void *aux)
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{
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struct dstemp_softc *sc = device_private(self);
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struct i2c_attach_args *ia = aux;
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char name[64] = "temperature";
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sc->sc_dev = self;
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sc->sc_i2c = ia->ia_tag;
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sc->sc_addr = ia->ia_addr;
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aprint_naive("\n");
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aprint_normal(": DS1361\n");
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sc->sc_sme = sysmon_envsys_create();
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sc->sc_sme->sme_name = device_xname(self);
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sc->sc_sme->sme_cookie = sc;
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sc->sc_sme->sme_refresh = dstemp_sensors_refresh;
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sc->sc_sensor_temp.units = ENVSYS_STEMP;
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sc->sc_sensor_temp.state = ENVSYS_SINVALID;
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#ifdef HAVE_OF
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int ch;
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ch = OF_child(ia->ia_cookie);
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if (ch != 0) {
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OF_getprop(ch, "location", name, 64);
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}
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#endif
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strncpy(sc->sc_sensor_temp.desc, name, sizeof(sc->sc_sensor_temp.desc));
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sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor_temp);
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sysmon_envsys_register(sc->sc_sme);
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}
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static void
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dstemp_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
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{
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struct dstemp_softc *sc = sme->sme_cookie;
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uint8_t cmd = DSTEMP_TCURRENT;
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uint16_t data = 0;
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int error;
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iic_acquire_bus(sc->sc_i2c, 0);
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error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
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sc->sc_addr, &cmd, 1, &data, 2, 0);
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iic_release_bus(sc->sc_i2c, 0);
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if (error) {
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edata->state = ENVSYS_SINVALID;
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} else {
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edata->value_cur =
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((uint64_t)(data>>4) * 62500) +
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+ 273150000;
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edata->state = ENVSYS_SVALID;
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}
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}
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