1216390Sjchandra/*- 2216390Sjchandra * Copyright (c) 2003-2009 RMI Corporation 3216390Sjchandra * All rights reserved. 4216390Sjchandra * 5216390Sjchandra * Redistribution and use in source and binary forms, with or without 6216390Sjchandra * modification, are permitted provided that the following conditions 7216390Sjchandra * are met: 8216390Sjchandra * 1. Redistributions of source code must retain the above copyright 9216390Sjchandra * notice, this list of conditions and the following disclaimer. 10216390Sjchandra * 2. Redistributions in binary form must reproduce the above copyright 11216390Sjchandra * notice, this list of conditions and the following disclaimer in the 12216390Sjchandra * documentation and/or other materials provided with the distribution. 13216390Sjchandra * 3. Neither the name of RMI Corporation, nor the names of its contributors, 14216390Sjchandra * may be used to endorse or promote products derived from this software 15216390Sjchandra * without specific prior written permission. 16216390Sjchandra * 17216390Sjchandra * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18216390Sjchandra * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19216390Sjchandra * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20216390Sjchandra * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21216390Sjchandra * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22216390Sjchandra * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23216390Sjchandra * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24216390Sjchandra * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25216390Sjchandra * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26216390Sjchandra * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27216390Sjchandra * SUCH DAMAGE. 28216390Sjchandra * 29216390Sjchandra * RMI_BSD */ 30216390Sjchandra 31216390Sjchandra#include <sys/cdefs.h> 32216390Sjchandra__FBSDID("$FreeBSD: releng/10.2/sys/mips/rmi/dev/iic/max6657.c 216410 2010-12-13 17:53:38Z jchandra $"); 33216390Sjchandra/* 34216390Sjchandra * temperature sensor chip sitting on the I2C bus. 35216390Sjchandra */ 36216390Sjchandra#include <sys/param.h> 37216390Sjchandra#include <sys/systm.h> 38216390Sjchandra#include <sys/kernel.h> 39216390Sjchandra#include <sys/lock.h> 40216390Sjchandra#include <sys/module.h> 41216390Sjchandra#include <sys/mutex.h> 42216390Sjchandra#include <sys/bus.h> 43216390Sjchandra#include <sys/resource.h> 44216390Sjchandra#include <sys/rman.h> 45216390Sjchandra#include <sys/sysctl.h> 46216390Sjchandra 47216390Sjchandra#include <machine/bus.h> 48216390Sjchandra#include <machine/cpu.h> 49216390Sjchandra#include <machine/cpufunc.h> 50216390Sjchandra#include <machine/frame.h> 51216390Sjchandra#include <machine/resource.h> 52216390Sjchandra 53216390Sjchandra#include <dev/iicbus/iiconf.h> 54216390Sjchandra#include <dev/iicbus/iicbus.h> 55216390Sjchandra 56216390Sjchandra#include <mips/rmi/board.h> 57216390Sjchandra#include <mips/rmi/rmi_boot_info.h> 58216390Sjchandra#include "iicbus_if.h" 59216390Sjchandra 60216390Sjchandra#define MAX6657_EXT_TEMP 1 61216390Sjchandra 62216390Sjchandrastruct max6657_softc { 63216390Sjchandra uint32_t sc_addr; 64216390Sjchandra device_t sc_dev; 65216390Sjchandra int sc_curtemp; 66216390Sjchandra int sc_lastupdate; /* in ticks */ 67216390Sjchandra}; 68216390Sjchandra 69216390Sjchandrastatic void max6657_update(struct max6657_softc *); 70216390Sjchandrastatic int max6657_read(device_t dev, uint32_t addr, int reg) ; 71216390Sjchandra 72216390Sjchandrastatic int 73216390Sjchandramax6657_probe(device_t dev) 74216390Sjchandra{ 75216390Sjchandra device_set_desc(dev, "MAX6657MSA Temperature Sensor"); 76216390Sjchandra return (0); 77216390Sjchandra} 78216390Sjchandra 79216390Sjchandrastatic int 80216390Sjchandramax6657_sysctl_temp(SYSCTL_HANDLER_ARGS) 81216390Sjchandra{ 82216390Sjchandra struct max6657_softc *sc = arg1; 83216390Sjchandra int temp; 84216390Sjchandra 85216390Sjchandra max6657_update(sc); 86216390Sjchandra temp = sc->sc_curtemp ; 87216390Sjchandra return sysctl_handle_int(oidp, &temp, 0, req); 88216390Sjchandra} 89216390Sjchandra 90216390Sjchandrastatic int 91216390Sjchandramax6657_attach(device_t dev) 92216390Sjchandra{ 93216390Sjchandra struct max6657_softc *sc = device_get_softc(dev); 94216390Sjchandra struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(dev); 95216390Sjchandra struct sysctl_oid *tree = device_get_sysctl_tree(dev); 96216390Sjchandra 97216390Sjchandra if(sc==NULL) { 98216390Sjchandra printf("max6657_attach device_get_softc failed\n"); 99216390Sjchandra return (0); 100216390Sjchandra } 101216390Sjchandra sc->sc_dev = dev; 102216390Sjchandra sc->sc_addr = iicbus_get_addr(dev); 103216390Sjchandra 104216390Sjchandra SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, 105216390Sjchandra "temp", CTLTYPE_INT | CTLFLAG_RD, sc, 0, 106216390Sjchandra max6657_sysctl_temp, "I", "operating temperature"); 107216390Sjchandra 108216390Sjchandra device_printf(dev, "Chip temperature {%d} Degree Celsius\n", 109216390Sjchandra max6657_read(sc->sc_dev, sc->sc_addr, MAX6657_EXT_TEMP)); 110216390Sjchandra 111216390Sjchandra return (0); 112216390Sjchandra} 113216390Sjchandra 114216390Sjchandrastatic int 115216390Sjchandramax6657_read(device_t dev, uint32_t slave_addr, int reg) 116216390Sjchandra{ 117216390Sjchandra uint8_t addr = reg; 118216390Sjchandra uint8_t data[1]; 119216390Sjchandra struct iic_msg msgs[2] = { 120216390Sjchandra { slave_addr, IIC_M_WR, 1, &addr }, 121216390Sjchandra { slave_addr, IIC_M_RD, 1, data }, 122216390Sjchandra }; 123216390Sjchandra 124216390Sjchandra return iicbus_transfer(dev, msgs, 2) != 0 ? -1 : data[0]; 125216390Sjchandra} 126216390Sjchandra 127216390Sjchandra 128216390Sjchandrastatic void 129216390Sjchandramax6657_update(struct max6657_softc *sc) 130216390Sjchandra{ 131216390Sjchandra int v; 132216390Sjchandra 133216390Sjchandra /* NB: no point in updating any faster than the chip */ 134216390Sjchandra if (ticks - sc->sc_lastupdate > hz) { 135216390Sjchandra v = max6657_read(sc->sc_dev, sc->sc_addr, MAX6657_EXT_TEMP); 136216390Sjchandra if (v >= 0) 137216390Sjchandra sc->sc_curtemp = v; 138216390Sjchandra sc->sc_lastupdate = ticks; 139216390Sjchandra } 140216390Sjchandra} 141216390Sjchandra 142216390Sjchandrastatic device_method_t max6657_methods[] = { 143216390Sjchandra DEVMETHOD(device_probe, max6657_probe), 144216390Sjchandra DEVMETHOD(device_attach, max6657_attach), 145216390Sjchandra 146216390Sjchandra {0, 0}, 147216390Sjchandra}; 148216390Sjchandra 149216390Sjchandrastatic driver_t max6657_driver = { 150216390Sjchandra "max6657", 151216390Sjchandra max6657_methods, 152216390Sjchandra sizeof(struct max6657_softc), 153216390Sjchandra}; 154216390Sjchandrastatic devclass_t max6657_devclass; 155216390Sjchandra 156216390SjchandraDRIVER_MODULE(max6657, iicbus, max6657_driver, max6657_devclass, 0, 0); 157216390SjchandraMODULE_VERSION(max6657, 1); 158216390SjchandraMODULE_DEPEND(max6657, iicbus, 1, 1, 1); 159