da89fa28c6
PowerMac7,2. - The fcu driver lets us read and write the fan RPMs for all fans in the PowerMac7,2. This driver is PowerMac specific. - The ds1775 is a driver to read the temperature for the drive bay sensor. - The max6690 is another driver to read temperatures. Here it is used to read the inlet, the backside and the U3 heatsink temperature. An additional driver, the ad7417, will follow later. Thanks to nwhitehorn for guiding me through this driver development. Approved by: nwhitehorn (mentor)
336 lines
8.4 KiB
C
336 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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phandle_t child;
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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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child = ofw_bus_get_node(dev);
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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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