/* $OpenBSD: lm75.c,v 1.6 2005/12/29 14:51:08 deraadt Exp $ */ /* $NetBSD: lm75.c,v 1.1 2003/09/30 00:35:31 thorpej Exp $ */ /* * Copyright (c) 2004 Alexander Yurchenko * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /* * Copyright (c) 2003 Wasabi Systems, Inc. * All rights reserved. * * Written by Jason R. Thorpe for Wasabi Systems, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed for the NetBSD Project by * Wasabi Systems, Inc. * 4. The name of Wasabi Systems, Inc. may not be used to endorse * or promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * National Semiconductor LM75/LM77 temperature sensor. */ #include #include #include #include #include #include #include struct lmtemp_softc { struct device sc_dev; i2c_tag_t sc_tag; int sc_address; int sc_model; struct sensor sc_sensor; }; int lmtemp_match(struct device *, void *, void *); void lmtemp_attach(struct device *, struct device *, void *); struct cfattach lmtemp_ca = { sizeof(struct lmtemp_softc), lmtemp_match, lmtemp_attach }; struct cfdriver lmtemp_cd = { NULL, "lmtemp", DV_DULL }; int lmtemp_config_write(struct lmtemp_softc *, uint8_t); int lmtemp_temp_read(struct lmtemp_softc *, uint8_t, int *); void lmtemp_refresh_sensor_data(void *); int lmtemp_match(struct device *parent, void *match, void *aux) { struct i2c_attach_args *ia = aux; if (strcmp(ia->ia_name, "lm75") == 0 || strcmp(ia->ia_name, "ds1775") == 0) return (1); return (0); } void lmtemp_attach(struct device *parent, struct device *self, void *aux) { struct lmtemp_softc *sc = (struct lmtemp_softc *)self; struct i2c_attach_args *ia = aux; u_int8_t ptr[1], reg[LM75_TEMP_LEN]; sc->sc_tag = ia->ia_tag; sc->sc_address = ia->ia_addr; sc->sc_model = LM_MODEL_LM75; /* Try to detect LM77 by poking Thigh register */ ptr[0] = LM77_REG_THIGH; iic_acquire_bus(sc->sc_tag, 0); if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_address, ptr, 1, reg, LM75_TEMP_LEN, 0) == 0) { /* Power up default is 64 degC */ if (lm77_wordtotemp((reg[0] << 8) | reg[1]) == 64 * 2) sc->sc_model = LM_MODEL_LM77; } printf(": %s (%s)\n", ia->ia_name, sc->sc_model == LM_MODEL_LM75 ? "LM75" : "LM77"); iic_release_bus(sc->sc_tag, 0); /* Set the configuration to defaults */ iic_acquire_bus(sc->sc_tag, 0); if (lmtemp_config_write(sc, 0) != 0) { printf("%s: unable to write config register\n", sc->sc_dev.dv_xname); iic_release_bus(sc->sc_tag, 0); return; } iic_release_bus(sc->sc_tag, 0); /* Initialize sensor data */ strlcpy(sc->sc_sensor.device, sc->sc_dev.dv_xname, sizeof(sc->sc_sensor.device)); sc->sc_sensor.type = SENSOR_TEMP; strlcpy(sc->sc_sensor.desc, "TEMP", sizeof(sc->sc_sensor.desc)); /* Hook into the hw.sensors sysctl */ SENSOR_ADD(&sc->sc_sensor); sensor_task_register(sc, lmtemp_refresh_sensor_data, LM_POLLTIME); } int lmtemp_config_write(struct lmtemp_softc *sc, uint8_t val) { uint8_t cmdbuf[2]; cmdbuf[0] = LM75_REG_CONFIG; cmdbuf[1] = val; return (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address, cmdbuf, 1, &cmdbuf[1], 1, 0)); } int lmtemp_temp_read(struct lmtemp_softc *sc, uint8_t which, int *valp) { u_int8_t cmdbuf[1]; u_int8_t buf[LM75_TEMP_LEN]; int error; cmdbuf[0] = which; error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_address, cmdbuf, 1, buf, LM75_TEMP_LEN, 0); if (error) return (error); switch (sc->sc_model) { case LM_MODEL_LM75: *valp = lm75_wordtotemp((buf[0] << 8) | buf[1]); break; case LM_MODEL_LM77: *valp = lm77_wordtotemp((buf[0] << 8) | buf[1]); break; default: printf("%s: unknown model (%d)\n", sc->sc_dev.dv_xname, sc->sc_model); return (1); } return (0); } void lmtemp_refresh_sensor_data(void *aux) { struct lmtemp_softc *sc = aux; int val; int error; error = lmtemp_temp_read(sc, LM75_REG_TEMP, &val); if (error) { #if 0 printf("%s: unable to read temperature, error = %d\n", sc->sc_dev.dv_xname, error); #endif sc->sc_sensor.flags |= SENSOR_FINVALID; return; } sc->sc_sensor.value = val * 500000 + 273150000; sc->sc_sensor.flags &= ~SENSOR_FINVALID; }