333 lines
8.4 KiB
C
333 lines
8.4 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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/* Inlet, Backside, U3 Heatsink sensor: MAX6690. */
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#define MAX6690_INT_TEMP 0x0
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#define MAX6690_EXT_TEMP 0x1
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#define MAX6690_EEXT_TEMP 0x10
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#define MAX6690_IEXT_TEMP 0x11
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#define MAX6690_TEMP_MASK 0xe0
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struct max6690_sensor {
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int id;
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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 max6690_probe(device_t);
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static int max6690_attach(device_t);
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/* Utility functions */
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static int max6690_sensor_sysctl(SYSCTL_HANDLER_ARGS);
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static void max6690_start(void *xdev);
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static int max6690_read_1(device_t dev, uint32_t addr, uint8_t reg,
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uint8_t *data);
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struct max6690_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 max6690_sensor *sc_sensors;
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int sc_nsensors;
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};
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static device_method_t max6690_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, max6690_probe),
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DEVMETHOD(device_attach, max6690_attach),
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{ 0, 0 },
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};
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static driver_t max6690_driver = {
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"max6690",
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max6690_methods,
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sizeof(struct max6690_softc)
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};
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static devclass_t max6690_devclass;
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DRIVER_MODULE(max6690, iicbus, max6690_driver, max6690_devclass, 0, 0);
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MALLOC_DEFINE(M_MAX6690, "max6690", "Temp-Monitor MAX6690");
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static int
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max6690_read_1(device_t dev, uint32_t addr, uint8_t reg, uint8_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, 1, 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 = *((uint8_t*)buf);
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return (0);
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}
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static int
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max6690_probe(device_t dev)
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{
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const char *name, *compatible;
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struct max6690_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, "max6690") != 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 MAX6690");
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return (0);
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}
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/*
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* This function returns the number of sensors. If we call it the second time
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* and we have allocated memory for sc->sc_sensors, we fill in the properties.
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*/
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static int
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max6690_fill_sensor_prop(device_t dev)
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{
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phandle_t child;
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struct max6690_softc *sc;
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u_int id[8];
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char location[96];
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int i = 0, j, len = 0, prop_len, prev_len = 0;
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sc = device_get_softc(dev);
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child = ofw_bus_get_node(dev);
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/* Fill the sensor location property. */
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prop_len = OF_getprop(child, "hwsensor-location", location,
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sizeof(location));
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while (len < prop_len) {
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if (sc->sc_sensors != NULL)
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strcpy(sc->sc_sensors[i].location, location + len);
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prev_len = strlen(location + len) + 1;
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len += prev_len;
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i++;
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}
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if (sc->sc_sensors == NULL)
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return (i);
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/* Fill the sensor id property. */
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prop_len = OF_getprop(child, "hwsensor-id", id, sizeof(id));
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for (j = 0; j < i; j++)
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sc->sc_sensors[j].id = (id[j] & 0xf);
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return (i);
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}
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static int
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max6690_attach(device_t dev)
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{
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struct max6690_softc *sc;
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sc = device_get_softc(dev);
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sc->enum_hook.ich_func = max6690_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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max6690_start(void *xdev)
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{
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struct max6690_softc *sc;
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struct sysctl_oid *oid, *sensroot_oid;
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struct sysctl_ctx_list *ctx;
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char sysctl_name[32];
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int i, j;
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device_t dev = (device_t)xdev;
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sc = device_get_softc(dev);
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sc->sc_nsensors = 0;
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/* Count the actual number of sensors. */
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sc->sc_nsensors = max6690_fill_sensor_prop(dev);
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device_printf(dev, "%d sensors detected.\n", sc->sc_nsensors);
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if (sc->sc_nsensors == 0)
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device_printf(dev, "WARNING: No MAX6690 sensors detected!\n");
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sc->sc_sensors = malloc (sc->sc_nsensors * sizeof(struct max6690_sensor),
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M_MAX6690, M_WAITOK | M_ZERO);
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ctx = device_get_sysctl_ctx(dev);
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sensroot_oid = SYSCTL_ADD_NODE(ctx,
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SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO, "sensor",
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CTLFLAG_RD, 0, "MAX6690 Sensor Information");
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/* Now we can fill the properties into the allocated struct. */
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sc->sc_nsensors = max6690_fill_sensor_prop(dev);
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/* Add sysctls for the sensors. */
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for (i = 0; i < sc->sc_nsensors; i++) {
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for (j = 0; j < strlen(sc->sc_sensors[i].location); j++) {
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sysctl_name[j] = tolower(sc->sc_sensors[i].location[j]);
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if (isspace(sysctl_name[j]))
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sysctl_name[j] = '_';
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}
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sysctl_name[j] = 0;
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oid = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(sensroot_oid),
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OID_AUTO,
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sysctl_name, CTLFLAG_RD, 0,
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"Sensor Information");
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/* I use i to pass the sensor id. */
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SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "temp",
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CTLTYPE_INT | CTLFLAG_RD, dev, i % 2,
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max6690_sensor_sysctl, "IK",
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"Sensor Temp in °C");
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}
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/* Dump sensor location & ID. */
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if (bootverbose) {
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device_printf(dev, "Sensors\n");
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for (i = 0; i < sc->sc_nsensors; i++) {
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device_printf(dev, "Location : %s ID: %d\n",
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sc->sc_sensors[i].location,
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sc->sc_sensors[i].id);
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}
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}
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config_intrhook_disestablish(&sc->enum_hook);
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}
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static int
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max6690_sensor_read(device_t dev, struct max6690_sensor *sens, int *temp)
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{
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uint8_t reg_int = 0, reg_ext = 0;
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uint8_t integer;
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uint8_t fraction;
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struct max6690_softc *sc;
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sc = device_get_softc(dev);
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/* The internal sensor id's are even, the external ar odd. */
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if ((sens->id % 2) == 0) {
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reg_int = MAX6690_INT_TEMP;
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reg_ext = MAX6690_IEXT_TEMP;
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} else {
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reg_int = MAX6690_EXT_TEMP;
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reg_ext = MAX6690_EEXT_TEMP;
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}
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max6690_read_1(sc->sc_dev, sc->sc_addr, reg_int, &integer);
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max6690_read_1(sc->sc_dev, sc->sc_addr, reg_ext, &fraction);
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fraction &= MAX6690_TEMP_MASK;
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/* The temperature is in tenth kelvin, the fractional part resolution
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is 0.125.
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*/
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*temp = (integer * 10) + (fraction >> 5) * 10 / 8;
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return (0);
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}
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static int
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max6690_sensor_sysctl(SYSCTL_HANDLER_ARGS)
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{
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device_t dev;
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struct max6690_softc *sc;
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struct max6690_sensor *sens;
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int value = 0;
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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 = max6690_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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