Add driver for Microchip MCP9800/1/2/3 temperature sensors.
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rkujawa
parent
fe043b8351
commit
ca20b36e59
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@ -1,4 +1,4 @@
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# $NetBSD: files.i2c,v 1.48 2013/04/25 20:55:34 rkujawa Exp $
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# $NetBSD: files.i2c,v 1.49 2013/05/06 22:04:12 rkujawa Exp $
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obsolete defflag opt_i2cbus.h I2C_SCAN
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define i2cbus { }
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@ -182,3 +182,8 @@ device tps65217pmic: sysmon_envsys
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attach tps65217pmic at iic
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file dev/i2c/tps65217pmic.c tps65217pmic
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# Microchip MCP980x
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device mcp980x: sysmon_envsys
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attach mcp980x at iic
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file dev/i2c/mcp980x.c mcp980x
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@ -0,0 +1,228 @@
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/* $NetBSD: mcp980x.c,v 1.1 2013/05/06 22:04:12 rkujawa Exp $ */
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/*-
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* Copyright (c) 2013 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Radoslaw Kujawa.
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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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/*
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* Microchip MCP9800/1/2/3 2-Wire High-Accuracy Temperature Sensor driver.
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* TODO: everything besides simple temperature read with default configuration.
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*
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* Note: MCP9805 is different and is supported by the sdtemp(4) driver.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: mcp980x.c,v 1.1 2013/05/06 22:04:12 rkujawa 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 <sys/mutex.h>
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#include <sys/endian.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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#include <dev/i2c/mcp980xreg.h>
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struct mcp980x_softc {
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device_t sc_dev;
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i2c_tag_t sc_tag;
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i2c_addr_t sc_addr;
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/* envsys(4) stuff */
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struct sysmon_envsys *sc_sme;
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envsys_data_t sc_sensor;
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kmutex_t sc_lock;
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};
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static int mcp980x_match(device_t, cfdata_t, void *);
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static void mcp980x_attach(device_t, device_t, void *);
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/*static uint8_t mcp980x_reg_read_1(struct mcp980x_softc *sc, uint8_t);*/
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static uint16_t mcp980x_reg_read_2(struct mcp980x_softc *sc, uint8_t reg);
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static uint32_t mcp980x_temperature(struct mcp980x_softc *sc);
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static void mcp980x_envsys_register(struct mcp980x_softc *);
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static void mcp980x_envsys_refresh(struct sysmon_envsys *, envsys_data_t *);
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CFATTACH_DECL_NEW(mcp980x, sizeof (struct mcp980x_softc),
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mcp980x_match, mcp980x_attach, NULL, NULL);
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static int
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mcp980x_match(device_t parent, cfdata_t cf, void *aux)
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{
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/*
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* No sane way to probe? Perhaps at least try to match constant part
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* of the I2Caddress.
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*/
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return 1;
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}
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static void
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mcp980x_attach(device_t parent, device_t self, void *aux)
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{
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struct mcp980x_softc *sc = device_private(self);
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struct i2c_attach_args *ia = aux;
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sc->sc_dev = self;
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sc->sc_addr = ia->ia_addr;
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sc->sc_tag = ia->ia_tag;
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aprint_normal(": Microchip MCP980x Temperature Sensor\n");
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mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE);
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mcp980x_envsys_register(sc);
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}
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static uint16_t
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mcp980x_reg_read_2(struct mcp980x_softc *sc, uint8_t reg)
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{
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uint8_t wbuf[2];
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uint16_t rv;
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if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL) != 0) {
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aprint_error_dev(sc->sc_dev, "cannot acquire bus for read\n");
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return 0;
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}
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wbuf[0] = reg;
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if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr, wbuf,
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1, &rv, 2, I2C_F_POLL)) {
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aprint_error_dev(sc->sc_dev, "cannot execute operation\n");
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iic_release_bus(sc->sc_tag, I2C_F_POLL);
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return 0;
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}
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iic_release_bus(sc->sc_tag, I2C_F_POLL);
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return be16toh(rv);
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}
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/* Will need that later for reading config register. */
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/*
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static uint8_t
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mcp980x_reg_read_1(struct mcp980x_softc *sc, uint8_t reg)
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{
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uint8_t rv, wbuf[2];
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if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL) != 0) {
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aprint_error_dev(sc->sc_dev, "cannot acquire bus for read\n");
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return 0;
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}
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wbuf[0] = reg;
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if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr, wbuf,
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1, &rv, 1, I2C_F_POLL)) {
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aprint_error_dev(sc->sc_dev, "cannot execute operation\n");
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iic_release_bus(sc->sc_tag, I2C_F_POLL);
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return 0;
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}
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iic_release_bus(sc->sc_tag, I2C_F_POLL);
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return rv;
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}*/
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/* Get temperature in microKelvins. */
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static uint32_t
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mcp980x_temperature(struct mcp980x_softc *sc)
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{
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uint16_t raw;
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uint32_t rv, uk, basedegc;
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raw = mcp980x_reg_read_2(sc, MCP980X_AMBIENT_TEMP);
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basedegc = (raw & MCP980X_AMBIENT_TEMP_DEGREES) >>
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MCP980X_AMBIENT_TEMP_DEGREES_SHIFT;
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uk = 1000000 * basedegc;
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if (raw & MCP980X_AMBIENT_TEMP_05DEGREE)
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uk += 500000;
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if (raw & MCP980X_AMBIENT_TEMP_025DEGREE)
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uk += 250000;
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if (raw & MCP980X_AMBIENT_TEMP_0125DEGREE)
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uk += 125000;
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if (raw & MCP980X_AMBIENT_TEMP_00625DEGREE)
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uk += 62500;
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if (raw & MCP980X_AMBIENT_TEMP_SIGN)
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rv = 273150000U - uk;
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else
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rv = 273150000U + uk;
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return rv;
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}
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static void
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mcp980x_envsys_register(struct mcp980x_softc *sc)
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{
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sc->sc_sme = sysmon_envsys_create();
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strlcpy(sc->sc_sensor.desc, "Ambient temp",
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sizeof(sc->sc_sensor.desc));
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sc->sc_sensor.units = ENVSYS_STEMP;
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sc->sc_sensor.state = ENVSYS_SINVALID;
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if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor)) {
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aprint_error_dev(sc->sc_dev,
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"error attaching sensor\n");
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return;
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}
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sc->sc_sme->sme_name = device_xname(sc->sc_dev);
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sc->sc_sme->sme_cookie = sc;
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sc->sc_sme->sme_refresh = mcp980x_envsys_refresh;
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if (sysmon_envsys_register(sc->sc_sme)) {
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aprint_error_dev(sc->sc_dev, "unable to register in 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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mcp980x_envsys_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
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{
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struct mcp980x_softc *sc = sme->sme_cookie;
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mutex_enter(&sc->sc_lock);
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edata->value_cur = mcp980x_temperature(sc);
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edata->state = ENVSYS_SVALID;
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mutex_exit(&sc->sc_lock);
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}
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@ -0,0 +1,57 @@
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/* $NetBSD: mcp980xreg.h,v 1.1 2013/05/06 22:04:12 rkujawa Exp $ */
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/*-
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* Copyright (c) 2013 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Radoslaw Kujawa.
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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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#ifndef _MCP980XREG_H_
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#define _MCP980XREG_H_
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#define MCP980X_ADDR_CONST 0x48 /* 1001___ */
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#define MCP980X_ADDR_VAR 0x7 /* XXX */
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#define MCP980X_AMBIENT_TEMP 0x0
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#define MCP980X_AMBIENT_TEMP_00625DEGREE __BIT(4)
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#define MCP980X_AMBIENT_TEMP_0125DEGREE __BIT(5)
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#define MCP980X_AMBIENT_TEMP_025DEGREE __BIT(6)
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#define MCP980X_AMBIENT_TEMP_05DEGREE __BIT(7)
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#define MCP980X_AMBIENT_TEMP_DEGREES __BITS(8,14)
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#define MCP980X_AMBIENT_TEMP_DEGREES_SHIFT 8
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#define MCP980X_AMBIENT_TEMP_SIGN __BIT(15)
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#define MCP980X_CONFIG 0x1
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#define MCP980X_CONFIG_ADC_RES __BITS(5,6)
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#define MCP980X_CONFIG_ADC_RES_SHIFT 5
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#define MCP980X_CONFIG_ADC_RES_9BIT 0
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#define MCP980X_CONFIG_ADC_RES_10BIT 1
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#define MCP980X_CONFIG_ADC_RES_11BIT 2
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#define MCP980X_CONFIG_ADC_RES_12BIT 3
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#endif /* _MCP980XREG_H_ */
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