1/*- 2 * Copyright (c) 2003-2009 RMI Corporation 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of RMI Corporation, nor the names of its contributors, 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * RMI_BSD */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD$"); 33/* 34 * temperature sensor chip sitting on the I2C bus. 35 */ 36#include <sys/param.h> 37#include <sys/systm.h> 38#include <sys/kernel.h> 39#include <sys/lock.h> 40#include <sys/module.h> 41#include <sys/mutex.h> 42#include <sys/bus.h> 43#include <sys/resource.h> 44#include <sys/rman.h> 45#include <sys/sysctl.h> 46 47#include <machine/bus.h> 48#include <machine/cpu.h> 49#include <machine/cpufunc.h> 50#include <machine/frame.h> 51#include <machine/resource.h> 52 53#include <dev/iicbus/iiconf.h> 54#include <dev/iicbus/iicbus.h> 55 56#include <mips/rmi/board.h> 57#include <mips/rmi/rmi_boot_info.h> 58#include "iicbus_if.h" 59 60#define MAX6657_EXT_TEMP 1 61 62struct max6657_softc { 63 uint32_t sc_addr; 64 device_t sc_dev; 65 int sc_curtemp; 66 int sc_lastupdate; /* in ticks */ 67}; 68 69static void max6657_update(struct max6657_softc *); 70static int max6657_read(device_t dev, uint32_t addr, int reg) ; 71 72static int 73max6657_probe(device_t dev) 74{ 75 device_set_desc(dev, "MAX6657MSA Temperature Sensor"); 76 return (0); 77} 78 79static int 80max6657_sysctl_temp(SYSCTL_HANDLER_ARGS) 81{ 82 struct max6657_softc *sc = arg1; 83 int temp; 84 85 max6657_update(sc); 86 temp = sc->sc_curtemp ; 87 return sysctl_handle_int(oidp, &temp, 0, req); 88} 89 90static int 91max6657_attach(device_t dev) 92{ 93 struct max6657_softc *sc = device_get_softc(dev); 94 struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(dev); 95 struct sysctl_oid *tree = device_get_sysctl_tree(dev); 96 97 if(sc==NULL) { 98 printf("max6657_attach device_get_softc failed\n"); 99 return (0); 100 } 101 sc->sc_dev = dev; 102 sc->sc_addr = iicbus_get_addr(dev); 103 104 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, 105 "temp", CTLTYPE_INT | CTLFLAG_RD, sc, 0, 106 max6657_sysctl_temp, "I", "operating temperature"); 107 108 device_printf(dev, "Chip temperature {%d} Degree Celsius\n", 109 max6657_read(sc->sc_dev, sc->sc_addr, MAX6657_EXT_TEMP)); 110 111 return (0); 112} 113 114static int 115max6657_read(device_t dev, uint32_t slave_addr, int reg) 116{ 117 uint8_t addr = reg; 118 uint8_t data[1]; 119 struct iic_msg msgs[2] = { 120 { slave_addr, IIC_M_WR, 1, &addr }, 121 { slave_addr, IIC_M_RD, 1, data }, 122 }; 123 124 return iicbus_transfer(dev, msgs, 2) != 0 ? -1 : data[0]; 125} 126 127 128static void 129max6657_update(struct max6657_softc *sc) 130{ 131 int v; 132 133 /* NB: no point in updating any faster than the chip */ 134 if (ticks - sc->sc_lastupdate > hz) { 135 v = max6657_read(sc->sc_dev, sc->sc_addr, MAX6657_EXT_TEMP); 136 if (v >= 0) 137 sc->sc_curtemp = v; 138 sc->sc_lastupdate = ticks; 139 } 140} 141 142static device_method_t max6657_methods[] = { 143 DEVMETHOD(device_probe, max6657_probe), 144 DEVMETHOD(device_attach, max6657_attach), 145 146 {0, 0}, 147}; 148 149static driver_t max6657_driver = { 150 "max6657", 151 max6657_methods, 152 sizeof(struct max6657_softc), 153}; 154static devclass_t max6657_devclass; 155 156DRIVER_MODULE(max6657, iicbus, max6657_driver, max6657_devclass, 0, 0); 157MODULE_VERSION(max6657, 1); 158MODULE_DEPEND(max6657, iicbus, 1, 1, 1); 159