/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2006 Sam Leffler. All rights reserved. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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. */ #include /* * Analog Devices AD7418 chip sitting on the I2C bus. */ #include #include #include #include #include #include #include #include #include #include "iicbus_if.h" #define IIC_M_WR 0 /* write operation */ #define AD7418_ADDR 0x50 /* slave address */ #define AD7418_TEMP 0 /* Temperature Value (r/o) */ #define AD7418_CONF 1 /* Config Register (r/w) */ #define AD7418_CONF_SHUTDOWN 0x01 #define AD7418_CONF_CHAN 0xe0 /* channel select mask */ #define AD7418_CHAN_TEMP 0x00 /* temperature channel */ #define AD7418_CHAN_VOLT 0x80 /* voltage channel */ #define AD7418_THYST 2 /* Thyst Setpoint (r/o) */ #define AD7418_TOTI 3 /* Toti Setpoint */ #define AD7418_VOLT 4 /* ADC aka Voltage (r/o) */ #define AD7418_CONF2 5 /* Config2 Register (r/w) */ struct ad7418_softc { device_t sc_dev; struct sx sc_lock; int sc_curchan; /* current channel */ int sc_curtemp; int sc_curvolt; int sc_lastupdate; /* in ticks */ }; static void ad7418_update(struct ad7418_softc *); static int ad7418_read_1(device_t dev, int reg); static int ad7418_write_1(device_t dev, int reg, int v); static int ad7418_probe(device_t dev) { /* XXX really probe? */ device_set_desc(dev, "Analog Devices AD7418 ADC"); return (BUS_PROBE_NOWILDCARD); } static int ad7418_sysctl_temp(SYSCTL_HANDLER_ARGS) { struct ad7418_softc *sc = arg1; int temp; sx_xlock(&sc->sc_lock); ad7418_update(sc); temp = (sc->sc_curtemp / 64) * 25; sx_xunlock(&sc->sc_lock); return sysctl_handle_int(oidp, &temp, 0, req); } static int ad7418_sysctl_voltage(SYSCTL_HANDLER_ARGS) { struct ad7418_softc *sc = arg1; int volt; sx_xlock(&sc->sc_lock); ad7418_update(sc); volt = (sc->sc_curvolt >> 6) * 564 / 10; sx_xunlock(&sc->sc_lock); return sysctl_handle_int(oidp, &volt, 0, req); } static int ad7418_attach(device_t dev) { struct ad7418_softc *sc = device_get_softc(dev); struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(dev); struct sysctl_oid *tree = device_get_sysctl_tree(dev); int conf; sc->sc_dev = dev; sc->sc_lastupdate = ticks - hz; sx_init(&sc->sc_lock, "ad7418"); SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, "temp", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_NEEDGIANT, sc, 0, ad7418_sysctl_temp, "I", "operating temperature"); SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, "volt", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_NEEDGIANT, sc, 0, ad7418_sysctl_voltage, "I", "input voltage"); /* enable chip if configured in shutdown mode */ conf = ad7418_read_1(dev, AD7418_CONF); if (conf >= 0 && (conf & AD7418_CONF_SHUTDOWN)) ad7418_write_1(dev, AD7418_CONF, conf &~ AD7418_CONF_SHUTDOWN); return (0); } static int ad7418_read_1(device_t dev, int reg) { uint8_t addr = reg; uint8_t data[1]; struct iic_msg msgs[2] = { { AD7418_ADDR, IIC_M_WR, 1, &addr }, { AD7418_ADDR, IIC_M_RD, 1, data }, }; return iicbus_transfer(dev, msgs, 2) != 0 ? -1 : data[0]; } static int ad7418_write_1(device_t dev, int reg, int v) { /* NB: register pointer precedes actual data */ uint8_t data[2]; struct iic_msg msgs[1] = { { AD7418_ADDR, IIC_M_WR, 2, data }, }; data[0] = reg; data[1] = v & 0xff; return iicbus_transfer(dev, msgs, 1); } static void ad7418_set_channel(struct ad7418_softc *sc, int chan) { if (sc->sc_curchan == chan) return; ad7418_write_1(sc->sc_dev, AD7418_CONF, (ad7418_read_1(sc->sc_dev, AD7418_CONF) &~ AD7418_CONF_CHAN)|chan); sc->sc_curchan = chan; #if 0 /* * NB: Linux driver delays here but chip data sheet * says nothing and things appear to work fine w/o * a delay on channel change. */ /* let channel change settle, 1 tick should be 'nuf (need ~1ms) */ tsleep(sc, 0, "ad7418", hz/1000); #endif } static int ad7418_read_2(device_t dev, int reg) { uint8_t addr = reg; uint8_t data[2]; struct iic_msg msgs[2] = { { AD7418_ADDR, IIC_M_WR, 1, &addr }, { AD7418_ADDR, IIC_M_RD, 2, data }, }; /* NB: D15..D8 precede D7..D0 per data sheet (Fig 12) */ return iicbus_transfer(dev, msgs, 2) != 0 ? -1 : ((data[0] << 8) | data[1]); } static void ad7418_update(struct ad7418_softc *sc) { int v; sx_assert(&sc->sc_lock, SA_XLOCKED); /* NB: no point in updating any faster than the chip */ if (ticks - sc->sc_lastupdate > hz) { ad7418_set_channel(sc, AD7418_CHAN_TEMP); v = ad7418_read_2(sc->sc_dev, AD7418_TEMP); if (v >= 0) sc->sc_curtemp = v; ad7418_set_channel(sc, AD7418_CHAN_VOLT); v = ad7418_read_2(sc->sc_dev, AD7418_VOLT); if (v >= 0) sc->sc_curvolt = v; sc->sc_lastupdate = ticks; } } static device_method_t ad7418_methods[] = { DEVMETHOD(device_probe, ad7418_probe), DEVMETHOD(device_attach, ad7418_attach), DEVMETHOD_END }; static driver_t ad7418_driver = { "ad7418", ad7418_methods, sizeof(struct ad7418_softc), }; DRIVER_MODULE(ad7418, iicbus, ad7418_driver, 0, 0); MODULE_VERSION(ad7418, 1); MODULE_DEPEND(ad7418, iicbus, 1, 1, 1);