235 lines
6.5 KiB
C
235 lines
6.5 KiB
C
/*-
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* Copyright (c) 2006 Sam Leffler. 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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR 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; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Analog Devices AD7418 chip sitting on the I2C bus.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/bus.h>
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#include <sys/resource.h>
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#include <sys/rman.h>
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#include <sys/sysctl.h>
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#include <machine/bus.h>
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#include <machine/cpu.h>
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#include <machine/cpufunc.h>
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#include <machine/frame.h>
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#include <machine/resource.h>
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#include <machine/intr.h>
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#include <dev/iicbus/iiconf.h>
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#include "iicbus_if.h"
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#define IIC_M_WR 0 /* write operation */
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#define AD7418_ADDR 0x50 /* slave address */
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#define AD7418_TEMP 0 /* Temperature Value (r/o) */
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#define AD7418_CONF 1 /* Config Register (r/w) */
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#define AD7418_CONF_SHUTDOWN 0x01
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#define AD7418_CONF_CHAN 0xe0 /* channel select mask */
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#define AD7418_CHAN_TEMP 0x00 /* temperature channel */
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#define AD7418_CHAN_VOLT 0x80 /* voltage channel */
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#define AD7418_THYST 2 /* Thyst Setpoint (r/o) */
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#define AD7418_TOTI 3 /* Toti Setpoint */
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#define AD7418_VOLT 4 /* ADC aka Voltage (r/o) */
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#define AD7418_CONF2 5 /* Config2 Register (r/w) */
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struct ad7418_softc {
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device_t sc_dev;
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struct mtx sc_mtx;
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int sc_curchan; /* current channel */
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int sc_curtemp;
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int sc_curvolt;
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int sc_lastupdate; /* in ticks */
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};
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static void ad7418_update(struct ad7418_softc *);
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static int ad7418_read_1(device_t dev, int reg);
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static int ad7418_write_1(device_t dev, int reg, int v);
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static int
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ad7418_probe(device_t dev)
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{
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/* XXX really probe? */
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device_set_desc(dev, "Analog Devices AD7418 ADC");
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return (0);
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}
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static int
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ad7418_sysctl_temp(SYSCTL_HANDLER_ARGS)
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{
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struct ad7418_softc *sc = arg1;
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int temp;
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ad7418_update(sc);
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temp = (sc->sc_curtemp / 64) * 25;
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return sysctl_handle_int(oidp, &temp, 0, req);
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}
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static int
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ad7418_sysctl_voltage(SYSCTL_HANDLER_ARGS)
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{
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struct ad7418_softc *sc = arg1;
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int volt;
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ad7418_update(sc);
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volt = (sc->sc_curvolt >> 6) * 564 / 10;
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return sysctl_handle_int(oidp, &volt, 0, req);
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}
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static int
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ad7418_attach(device_t dev)
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{
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struct ad7418_softc *sc = device_get_softc(dev);
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struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(dev);
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struct sysctl_oid *tree = device_get_sysctl_tree(dev);
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int conf;
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sc->sc_dev = dev;
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mtx_init(&sc->sc_mtx, "ad7418", "ad7418", MTX_DEF);
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SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
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"temp", CTLTYPE_INT | CTLFLAG_RD, sc, 0,
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ad7418_sysctl_temp, "I", "operating temperature");
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SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
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"volt", CTLTYPE_INT | CTLFLAG_RD, sc, 0,
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ad7418_sysctl_voltage, "I", "input voltage");
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/* enable chip if configured in shutdown mode */
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conf = ad7418_read_1(dev, AD7418_CONF);
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if (conf >= 0 && (conf & AD7418_CONF_SHUTDOWN))
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ad7418_write_1(dev, AD7418_CONF, conf &~ AD7418_CONF_SHUTDOWN);
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return (0);
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}
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static int
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ad7418_read_1(device_t dev, int reg)
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{
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uint8_t addr = reg;
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uint8_t data[1];
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struct iic_msg msgs[2] = {
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{ AD7418_ADDR, IIC_M_WR, 1, &addr },
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{ AD7418_ADDR, IIC_M_RD, 1, data },
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};
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return iicbus_transfer(dev, msgs, 2) != 0 ? -1 : data[0];
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}
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static int
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ad7418_write_1(device_t dev, int reg, int v)
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{
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/* NB: register pointer precedes actual data */
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uint8_t data[2];
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struct iic_msg msgs[1] = {
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{ AD7418_ADDR, IIC_M_WR, 2, data },
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};
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data[0] = reg;
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data[1] = v & 0xff;
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return iicbus_transfer(dev, msgs, 1);
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}
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static void
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ad7418_set_channel(struct ad7418_softc *sc, int chan)
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{
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if (sc->sc_curchan == chan)
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return;
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ad7418_write_1(sc->sc_dev, AD7418_CONF,
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(ad7418_read_1(sc->sc_dev, AD7418_CONF) &~ AD7418_CONF_CHAN)|chan);
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sc->sc_curchan = chan;
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#if 0
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/*
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* NB: Linux driver delays here but chip data sheet
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* says nothing and things appear to work fine w/o
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* a delay on channel change. If this is enabled
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* be sure to account for losing the mutex below
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* in ad7418_update.
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*/
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mtx_assert(&sc->sc_mtx, MA_OWNED);
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/* let channel change settle, 1 tick should be 'nuf (need ~1ms) */
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msleep(sc, &sc->sc_mtx, 0, "ad7418", 1);
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#endif
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}
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static int
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ad7418_read_2(device_t dev, int reg)
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{
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uint8_t addr = reg;
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uint8_t data[2];
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struct iic_msg msgs[2] = {
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{ AD7418_ADDR, IIC_M_WR, 1, &addr },
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{ AD7418_ADDR, IIC_M_RD, 2, data },
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};
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/* NB: D15..D8 precede D7..D0 per data sheet (Fig 12) */
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return iicbus_transfer(dev, msgs, 2) != 0 ?
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-1 : ((data[0] << 8) | data[1]);
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}
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static void
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ad7418_update(struct ad7418_softc *sc)
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{
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int v;
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mtx_lock(&sc->sc_mtx);
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/* NB: no point in updating any faster than the chip */
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if (ticks - sc->sc_lastupdate > hz) {
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ad7418_set_channel(sc, AD7418_CHAN_TEMP);
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v = ad7418_read_2(sc->sc_dev, AD7418_TEMP);
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if (v >= 0)
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sc->sc_curtemp = v;
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ad7418_set_channel(sc, AD7418_CHAN_VOLT);
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v = ad7418_read_2(sc->sc_dev, AD7418_VOLT);
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if (v >= 0)
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sc->sc_curvolt = v;
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sc->sc_lastupdate = ticks;
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}
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mtx_unlock(&sc->sc_mtx);
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}
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static device_method_t ad7418_methods[] = {
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DEVMETHOD(device_probe, ad7418_probe),
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DEVMETHOD(device_attach, ad7418_attach),
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{0, 0},
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};
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static driver_t ad7418_driver = {
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"ad7418",
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ad7418_methods,
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sizeof(struct ad7418_softc),
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};
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static devclass_t ad7418_devclass;
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DRIVER_MODULE(ad7418, iicbus, ad7418_driver, ad7418_devclass, 0, 0);
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MODULE_VERSION(ad7418, 1);
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MODULE_DEPEND(ad7418, iicbus, 1, 1, 1);
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