diff options
Diffstat (limited to 'sys/dev/i2c/lm75.c')
| -rw-r--r-- | sys/dev/i2c/lm75.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/sys/dev/i2c/lm75.c b/sys/dev/i2c/lm75.c new file mode 100644 index 00000000000..162247bdc60 --- /dev/null +++ b/sys/dev/i2c/lm75.c @@ -0,0 +1,220 @@ +/* $OpenBSD: lm75.c,v 1.1 2004/05/23 18:12:37 grange Exp $ */ +/* $NetBSD: lm75.c,v 1.1 2003/09/30 00:35:31 thorpej Exp $ */ +/* + * Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org> + * + * 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 <sys/param.h> +#include <sys/systm.h> +#include <sys/device.h> +#include <sys/kernel.h> +#include <sys/sensors.h> +#include <sys/timeout.h> + +#include <dev/i2c/i2cvar.h> +#include <dev/i2c/lm75reg.h> + +struct lmtemp_softc { + struct device sc_dev; + i2c_tag_t sc_tag; + int sc_address; + int sc_model; + + struct sensor sc_sensor; + struct timeout sc_timeout; +}; + +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; + + /* XXX: we allow wider mask for LM77 */ + if ((ia->ia_addr & LM75_ADDRMASK) == LM75_ADDR) + 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; + + /* Try to detect LM77 by poking Thigh register */ + ptr[0] = LM77_REG_THIGH; + iic_acquire_bus(sc->sc_tag, I2C_F_POLL); + 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(": LM77\n"); + } + } else { + sc->sc_model = LM_MODEL_LM75; + printf(": LM75\n"); + } + iic_release_bus(sc->sc_tag, I2C_F_POLL); + + /* Set the configuration to defaults */ + iic_acquire_bus(sc->sc_tag, I2C_F_POLL); + 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, I2C_F_POLL); + return; + } + iic_release_bus(sc->sc_tag, I2C_F_POLL); + + /* 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); + + /* Set poll timer */ + timeout_set(&sc->sc_timeout, lmtemp_refresh_sensor_data, sc); + timeout_add(&sc->sc_timeout, 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, I2C_F_POLL)); +} + +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; + + timeout_add(&sc->sc_timeout, LM_POLLTIME); +} |