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274 lines
6.9 KiB
C
274 lines
6.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2010 Andreas Tobler
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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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#include <powerpc/powermac/powermac_thermal.h>
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/* Drivebay sensor: LM75/DS1775. */
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#define DS1775_TEMP 0x0
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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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struct ds1775_softc {
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struct pmac_therm sc_sensor;
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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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};
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/* Utility functions */
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static int ds1775_sensor_read(struct ds1775_softc *sc);
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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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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(ds1775, iicbus, ds1775_driver, ds1775_devclass, 0, 0);
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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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int err, try = 0;
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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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for (;;)
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{
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err = iicbus_transfer(dev, msg, nitems(msg));
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if (err != 0)
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goto retry;
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*data = *((uint16_t*)buf);
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return (0);
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retry:
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if (++try > 5) {
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device_printf(dev, "iicbus read failed\n");
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return (-1);
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}
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pause("ds1775_read_2", hz);
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}
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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 sysctl_oid *oid, *sensroot_oid;
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struct sysctl_ctx_list *ctx;
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ssize_t plen;
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int i;
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char sysctl_name[40], sysctl_desc[40];
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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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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 | CTLFLAG_MPSAFE, 0, "DS1775 Sensor Information");
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if (OF_getprop(child, "hwsensor-zone", &sc->sc_sensor.zone,
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sizeof(int)) < 0)
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sc->sc_sensor.zone = 0;
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plen = OF_getprop(child, "hwsensor-location", sc->sc_sensor.name,
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sizeof(sc->sc_sensor.name));
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if (plen == -1) {
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strcpy(sysctl_name, "sensor");
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} else {
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for (i = 0; i < strlen(sc->sc_sensor.name); i++) {
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sysctl_name[i] = tolower(sc->sc_sensor.name[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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}
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/* Make up target temperatures. These are low, for the drive bay. */
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if (sc->sc_sensor.zone == 0) {
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sc->sc_sensor.target_temp = 500 + ZERO_C_TO_K;
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sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K;
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}
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else {
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sc->sc_sensor.target_temp = 300 + ZERO_C_TO_K;
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sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K;
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}
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sc->sc_sensor.read =
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(int (*)(struct pmac_therm *sc))(ds1775_sensor_read);
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pmac_thermal_sensor_register(&sc->sc_sensor);
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sprintf(sysctl_desc,"%s %s", sc->sc_sensor.name, "(C)");
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oid = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(sensroot_oid),
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OID_AUTO, sysctl_name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
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"Sensor Information");
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SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "temp",
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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(struct ds1775_softc *sc)
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{
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uint16_t buf[2];
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uint16_t read;
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int err;
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err = ds1775_read_2(sc->sc_dev, sc->sc_addr, DS1775_TEMP, buf);
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if (err < 0)
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return (-1);
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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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return (((int16_t)(read) >> 7) * 5 + ZERO_C_TO_K);
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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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int error;
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int temp;
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dev = arg1;
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sc = device_get_softc(dev);
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temp = ds1775_sensor_read(sc);
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if (temp < 0)
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return (EIO);
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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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