7cea3d952b
functionality is the same, a difference is that the DS1775 has a better precision than the LM75. But we do not use it in our setup. Make the LM75 work the same as the DS1775. Fix a typo in device_set_desc. Tested by: Paul Mather <paul at gromit dlib vt edu> Approved by: nwhitehorn (mentor)
257 lines
6.2 KiB
C
257 lines
6.2 KiB
C
/*-
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* Copyright (c) 2010 Andreas Tobler
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* 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,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/systm.h>
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#include <sys/module.h>
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#include <sys/callout.h>
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#include <sys/conf.h>
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#include <sys/cpu.h>
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#include <sys/ctype.h>
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#include <sys/kernel.h>
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#include <sys/reboot.h>
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#include <sys/rman.h>
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#include <sys/sysctl.h>
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#include <sys/limits.h>
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#include <machine/bus.h>
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#include <machine/md_var.h>
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#include <dev/iicbus/iicbus.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#define FCU_ZERO_C_TO_K 2732
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/* Drivebay sensor: LM75/DS1775. */
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#define DS1775_TEMP 0x0
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struct ds1775_sensor {
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char location[32];
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};
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/* Regular bus attachment functions */
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static int ds1775_probe(device_t);
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static int ds1775_attach(device_t);
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/* Utility functions */
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static int ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS);
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static void ds1775_start(void *xdev);
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static int ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg,
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uint16_t *data);
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struct ds1775_softc {
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device_t sc_dev;
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struct intr_config_hook enum_hook;
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uint32_t sc_addr;
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struct ds1775_sensor *sc_sensors;
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};
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static device_method_t ds1775_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, ds1775_probe),
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DEVMETHOD(device_attach, ds1775_attach),
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{ 0, 0 },
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};
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static driver_t ds1775_driver = {
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"ds1775",
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ds1775_methods,
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sizeof(struct ds1775_softc)
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};
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static devclass_t ds1775_devclass;
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DRIVER_MODULE(ds1755, iicbus, ds1775_driver, ds1775_devclass, 0, 0);
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MALLOC_DEFINE(M_DS1775, "ds1775", "Temp-Monitor DS1775");
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static int
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ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, uint16_t *data)
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{
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uint8_t buf[4];
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struct iic_msg msg[2] = {
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{ addr, IIC_M_WR | IIC_M_NOSTOP, 1, ® },
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{ addr, IIC_M_RD, 2, buf },
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};
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if (iicbus_transfer(dev, msg, 2) != 0) {
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device_printf(dev, "iicbus read failed\n");
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return (EIO);
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}
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*data = *((uint16_t*)buf);
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return (0);
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}
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static int
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ds1775_probe(device_t dev)
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{
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const char *name, *compatible;
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struct ds1775_softc *sc;
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name = ofw_bus_get_name(dev);
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compatible = ofw_bus_get_compat(dev);
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if (!name)
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return (ENXIO);
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if (strcmp(name, "temp-monitor") != 0 ||
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(strcmp(compatible, "ds1775") != 0 &&
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strcmp(compatible, "lm75") != 0))
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return (ENXIO);
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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sc->sc_addr = iicbus_get_addr(dev);
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device_set_desc(dev, "Temp-Monitor DS1775");
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return (0);
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}
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static int
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ds1775_attach(device_t dev)
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{
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struct ds1775_softc *sc;
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sc = device_get_softc(dev);
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sc->enum_hook.ich_func = ds1775_start;
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sc->enum_hook.ich_arg = dev;
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/* We have to wait until interrupts are enabled. I2C read and write
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* only works if the interrupts are available.
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* The unin/i2c is controlled by the htpic on unin. But this is not
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* the master. The openpic on mac-io is controlling the htpic.
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* This one gets attached after the mac-io probing and then the
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* interrupts will be available.
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*/
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if (config_intrhook_establish(&sc->enum_hook) != 0)
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return (ENOMEM);
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return (0);
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}
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static void
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ds1775_start(void *xdev)
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{
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phandle_t child;
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struct ds1775_softc *sc;
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struct ds1775_sensor *sens;
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struct sysctl_oid *sensroot_oid;
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struct sysctl_ctx_list *ctx;
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int i;
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char sysctl_name[40], sysctl_desc[40];
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const char *units;
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device_t dev = (device_t)xdev;
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sc = device_get_softc(dev);
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child = ofw_bus_get_node(dev);
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sc->sc_sensors = malloc (sizeof(struct ds1775_sensor),
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M_DS1775, M_WAITOK | M_ZERO);
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sens = sc->sc_sensors;
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ctx = device_get_sysctl_ctx(dev);
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sensroot_oid = device_get_sysctl_tree(dev);
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OF_getprop(child, "hwsensor-location", sens->location,
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sizeof(sens->location));
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units = "C";
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for (i = 0; i < strlen(sens->location); i++) {
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sysctl_name[i] = tolower(sens->location[i]);
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if (isspace(sysctl_name[i]))
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sysctl_name[i] = '_';
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}
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sysctl_name[i] = 0;
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sprintf(sysctl_desc,"%s (%s)", sens->location, units);
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SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(sensroot_oid), OID_AUTO,
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sysctl_name,
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CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
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0, ds1775_sensor_sysctl, "IK", sysctl_desc);
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config_intrhook_disestablish(&sc->enum_hook);
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}
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static int
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ds1775_sensor_read(device_t dev, struct ds1775_sensor *sens, int *temp)
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{
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struct ds1775_softc *sc;
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uint16_t buf[2];
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uint16_t read;
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sc = device_get_softc(dev);
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ds1775_read_2(sc->sc_dev, sc->sc_addr, DS1775_TEMP, buf);
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read = *((int16_t *)buf);
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/* The default mode of the ADC is 9 bit, the resolution is 0.5 C per
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bit. The temperature is in tenth kelvin.
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*/
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*temp = ((int16_t)(read) >> 7) * 5;
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return (0);
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}
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static int
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ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS)
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{
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device_t dev;
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struct ds1775_softc *sc;
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struct ds1775_sensor *sens;
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int value;
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int error;
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unsigned int temp;
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dev = arg1;
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sc = device_get_softc(dev);
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sens = &sc->sc_sensors[arg2];
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error = ds1775_sensor_read(dev, sens, &value);
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if (error != 0)
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return (error);
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temp = value + FCU_ZERO_C_TO_K;
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error = sysctl_handle_int(oidp, &temp, 0, req);
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return (error);
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}
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