1164419Ssam/*- 2164419Ssam * Copyright (c) 2006 Sam Leffler. All rights reserved. 3164419Ssam * 4164419Ssam * Redistribution and use in source and binary forms, with or without 5164419Ssam * modification, are permitted provided that the following conditions 6164419Ssam * are met: 7164419Ssam * 1. Redistributions of source code must retain the above copyright 8164419Ssam * notice, this list of conditions and the following disclaimer. 9164419Ssam * 2. Redistributions in binary form must reproduce the above copyright 10164419Ssam * notice, this list of conditions and the following disclaimer in the 11164419Ssam * documentation and/or other materials provided with the distribution. 12164419Ssam * 13164419Ssam * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14164419Ssam * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15164419Ssam * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16164419Ssam * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 17164419Ssam * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 18164419Ssam * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 19164419Ssam * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 20164419Ssam * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21164419Ssam * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 22164419Ssam * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23164419Ssam */ 24164419Ssam 25164419Ssam#include <sys/cdefs.h> 26164419Ssam__FBSDID("$FreeBSD$"); 27164419Ssam/* 28164419Ssam * Analog Devices AD7418 chip sitting on the I2C bus. 29164419Ssam */ 30164419Ssam#include <sys/param.h> 31164419Ssam#include <sys/systm.h> 32164419Ssam#include <sys/kernel.h> 33164419Ssam#include <sys/lock.h> 34164419Ssam#include <sys/module.h> 35164419Ssam#include <sys/bus.h> 36164419Ssam#include <sys/resource.h> 37164419Ssam#include <sys/rman.h> 38164419Ssam#include <sys/sysctl.h> 39181305Sjhb#include <sys/sx.h> 40164419Ssam 41164419Ssam#include <machine/bus.h> 42164419Ssam#include <machine/cpu.h> 43164419Ssam#include <machine/cpufunc.h> 44164419Ssam#include <machine/frame.h> 45164419Ssam#include <machine/resource.h> 46164419Ssam#include <machine/intr.h> 47164419Ssam 48164419Ssam#include <dev/iicbus/iiconf.h> 49164419Ssam 50164419Ssam#include "iicbus_if.h" 51164419Ssam 52164419Ssam#define IIC_M_WR 0 /* write operation */ 53164419Ssam 54164419Ssam#define AD7418_ADDR 0x50 /* slave address */ 55164419Ssam 56164419Ssam#define AD7418_TEMP 0 /* Temperature Value (r/o) */ 57164419Ssam#define AD7418_CONF 1 /* Config Register (r/w) */ 58164419Ssam#define AD7418_CONF_SHUTDOWN 0x01 59164419Ssam#define AD7418_CONF_CHAN 0xe0 /* channel select mask */ 60164419Ssam#define AD7418_CHAN_TEMP 0x00 /* temperature channel */ 61164419Ssam#define AD7418_CHAN_VOLT 0x80 /* voltage channel */ 62164419Ssam#define AD7418_THYST 2 /* Thyst Setpoint (r/o) */ 63164419Ssam#define AD7418_TOTI 3 /* Toti Setpoint */ 64164419Ssam#define AD7418_VOLT 4 /* ADC aka Voltage (r/o) */ 65164419Ssam#define AD7418_CONF2 5 /* Config2 Register (r/w) */ 66164419Ssam 67164419Ssamstruct ad7418_softc { 68164419Ssam device_t sc_dev; 69181305Sjhb struct sx sc_lock; 70164419Ssam int sc_curchan; /* current channel */ 71164419Ssam int sc_curtemp; 72164419Ssam int sc_curvolt; 73164419Ssam int sc_lastupdate; /* in ticks */ 74164419Ssam}; 75164419Ssam 76164419Ssamstatic void ad7418_update(struct ad7418_softc *); 77164419Ssamstatic int ad7418_read_1(device_t dev, int reg); 78164419Ssamstatic int ad7418_write_1(device_t dev, int reg, int v); 79164419Ssam 80164419Ssamstatic int 81164419Ssamad7418_probe(device_t dev) 82164419Ssam{ 83164419Ssam /* XXX really probe? */ 84164419Ssam device_set_desc(dev, "Analog Devices AD7418 ADC"); 85186833Snwhitehorn return (BUS_PROBE_NOWILDCARD); 86164419Ssam} 87164419Ssam 88164419Ssamstatic int 89164419Ssamad7418_sysctl_temp(SYSCTL_HANDLER_ARGS) 90164419Ssam{ 91164419Ssam struct ad7418_softc *sc = arg1; 92164419Ssam int temp; 93164419Ssam 94181305Sjhb sx_xlock(&sc->sc_lock); 95164419Ssam ad7418_update(sc); 96164419Ssam temp = (sc->sc_curtemp / 64) * 25; 97181305Sjhb sx_xunlock(&sc->sc_lock); 98164419Ssam return sysctl_handle_int(oidp, &temp, 0, req); 99164419Ssam} 100164419Ssam 101164419Ssamstatic int 102164419Ssamad7418_sysctl_voltage(SYSCTL_HANDLER_ARGS) 103164419Ssam{ 104164419Ssam struct ad7418_softc *sc = arg1; 105164419Ssam int volt; 106164419Ssam 107181305Sjhb sx_xlock(&sc->sc_lock); 108164419Ssam ad7418_update(sc); 109164419Ssam volt = (sc->sc_curvolt >> 6) * 564 / 10; 110181305Sjhb sx_xunlock(&sc->sc_lock); 111164419Ssam return sysctl_handle_int(oidp, &volt, 0, req); 112164419Ssam} 113164419Ssam 114164419Ssamstatic int 115164419Ssamad7418_attach(device_t dev) 116164419Ssam{ 117164419Ssam struct ad7418_softc *sc = device_get_softc(dev); 118164419Ssam struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(dev); 119164419Ssam struct sysctl_oid *tree = device_get_sysctl_tree(dev); 120164419Ssam int conf; 121164419Ssam 122164419Ssam sc->sc_dev = dev; 123181682Sed sx_init(&sc->sc_lock, "ad7418"); 124164419Ssam 125164419Ssam SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, 126164419Ssam "temp", CTLTYPE_INT | CTLFLAG_RD, sc, 0, 127164419Ssam ad7418_sysctl_temp, "I", "operating temperature"); 128164419Ssam SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, 129164419Ssam "volt", CTLTYPE_INT | CTLFLAG_RD, sc, 0, 130164419Ssam ad7418_sysctl_voltage, "I", "input voltage"); 131164419Ssam 132164419Ssam /* enable chip if configured in shutdown mode */ 133164419Ssam conf = ad7418_read_1(dev, AD7418_CONF); 134164419Ssam if (conf >= 0 && (conf & AD7418_CONF_SHUTDOWN)) 135164419Ssam ad7418_write_1(dev, AD7418_CONF, conf &~ AD7418_CONF_SHUTDOWN); 136164419Ssam 137164419Ssam return (0); 138164419Ssam} 139164419Ssam 140164419Ssamstatic int 141164419Ssamad7418_read_1(device_t dev, int reg) 142164419Ssam{ 143164419Ssam uint8_t addr = reg; 144164419Ssam uint8_t data[1]; 145164419Ssam struct iic_msg msgs[2] = { 146164419Ssam { AD7418_ADDR, IIC_M_WR, 1, &addr }, 147164419Ssam { AD7418_ADDR, IIC_M_RD, 1, data }, 148164419Ssam }; 149164419Ssam return iicbus_transfer(dev, msgs, 2) != 0 ? -1 : data[0]; 150164419Ssam} 151164419Ssam 152164419Ssamstatic int 153164419Ssamad7418_write_1(device_t dev, int reg, int v) 154164419Ssam{ 155164419Ssam /* NB: register pointer precedes actual data */ 156164419Ssam uint8_t data[2]; 157164419Ssam struct iic_msg msgs[1] = { 158164419Ssam { AD7418_ADDR, IIC_M_WR, 2, data }, 159164419Ssam }; 160164419Ssam data[0] = reg; 161164419Ssam data[1] = v & 0xff; 162164419Ssam return iicbus_transfer(dev, msgs, 1); 163164419Ssam} 164164419Ssam 165164419Ssamstatic void 166164419Ssamad7418_set_channel(struct ad7418_softc *sc, int chan) 167164419Ssam{ 168164419Ssam if (sc->sc_curchan == chan) 169164419Ssam return; 170164419Ssam ad7418_write_1(sc->sc_dev, AD7418_CONF, 171164419Ssam (ad7418_read_1(sc->sc_dev, AD7418_CONF) &~ AD7418_CONF_CHAN)|chan); 172164419Ssam sc->sc_curchan = chan; 173164419Ssam#if 0 174164419Ssam /* 175164419Ssam * NB: Linux driver delays here but chip data sheet 176164419Ssam * says nothing and things appear to work fine w/o 177181305Sjhb * a delay on channel change. 178164419Ssam */ 179164419Ssam /* let channel change settle, 1 tick should be 'nuf (need ~1ms) */ 180181305Sjhb tsleep(sc, 0, "ad7418", hz/1000); 181164419Ssam#endif 182164419Ssam} 183164419Ssam 184164419Ssamstatic int 185164419Ssamad7418_read_2(device_t dev, int reg) 186164419Ssam{ 187164419Ssam uint8_t addr = reg; 188164419Ssam uint8_t data[2]; 189164419Ssam struct iic_msg msgs[2] = { 190164419Ssam { AD7418_ADDR, IIC_M_WR, 1, &addr }, 191164419Ssam { AD7418_ADDR, IIC_M_RD, 2, data }, 192164419Ssam }; 193164419Ssam /* NB: D15..D8 precede D7..D0 per data sheet (Fig 12) */ 194164419Ssam return iicbus_transfer(dev, msgs, 2) != 0 ? 195164419Ssam -1 : ((data[0] << 8) | data[1]); 196164419Ssam} 197164419Ssam 198164419Ssamstatic void 199164419Ssamad7418_update(struct ad7418_softc *sc) 200164419Ssam{ 201164419Ssam int v; 202164419Ssam 203181305Sjhb sx_assert(&sc->sc_lock, SA_XLOCKED); 204164419Ssam /* NB: no point in updating any faster than the chip */ 205164419Ssam if (ticks - sc->sc_lastupdate > hz) { 206164419Ssam ad7418_set_channel(sc, AD7418_CHAN_TEMP); 207164419Ssam v = ad7418_read_2(sc->sc_dev, AD7418_TEMP); 208164419Ssam if (v >= 0) 209164419Ssam sc->sc_curtemp = v; 210164419Ssam ad7418_set_channel(sc, AD7418_CHAN_VOLT); 211164419Ssam v = ad7418_read_2(sc->sc_dev, AD7418_VOLT); 212164419Ssam if (v >= 0) 213164419Ssam sc->sc_curvolt = v; 214164419Ssam sc->sc_lastupdate = ticks; 215164419Ssam } 216164419Ssam} 217164419Ssam 218164419Ssamstatic device_method_t ad7418_methods[] = { 219164419Ssam DEVMETHOD(device_probe, ad7418_probe), 220164419Ssam DEVMETHOD(device_attach, ad7418_attach), 221164419Ssam 222246128Ssbz DEVMETHOD_END 223164419Ssam}; 224164419Ssam 225164419Ssamstatic driver_t ad7418_driver = { 226164419Ssam "ad7418", 227164419Ssam ad7418_methods, 228164419Ssam sizeof(struct ad7418_softc), 229164419Ssam}; 230164419Ssamstatic devclass_t ad7418_devclass; 231164419Ssam 232164419SsamDRIVER_MODULE(ad7418, iicbus, ad7418_driver, ad7418_devclass, 0, 0); 233164419SsamMODULE_VERSION(ad7418, 1); 234164419SsamMODULE_DEPEND(ad7418, iicbus, 1, 1, 1); 235