263 lines
6.1 KiB
C
263 lines
6.1 KiB
C
/*-
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* Copyright (c) 2010 Nathan Whitehorn
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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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*/
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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/systm.h>
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#include <sys/module.h>
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#include <sys/bus.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/sysctl.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/ofw_bus.h>
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#include <dev/ofw/openfirm.h>
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struct smu_sensor {
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cell_t reg;
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char location[32];
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enum {
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SMU_CURRENT_SENSOR,
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SMU_VOLTAGE_SENSOR,
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SMU_POWER_SENSOR,
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SMU_TEMP_SENSOR
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} type;
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};
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static int smusat_probe(device_t);
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static int smusat_attach(device_t);
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static int smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS);
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MALLOC_DEFINE(M_SMUSAT, "smusat", "SMU Sattelite Sensors");
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static device_method_t smusat_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, smusat_probe),
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DEVMETHOD(device_attach, smusat_attach),
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{ 0, 0 },
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};
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struct smusat_softc {
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struct smu_sensor *sc_sensors;
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int sc_nsensors;
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uint8_t sc_cache[16];
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time_t sc_last_update;
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};
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static driver_t smusat_driver = {
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"smusat",
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smusat_methods,
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sizeof(struct smusat_softc)
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};
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static devclass_t smusat_devclass;
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DRIVER_MODULE(smusat, iicbus, smusat_driver, smusat_devclass, 0, 0);
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static int
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smusat_probe(device_t dev)
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{
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const char *compat = ofw_bus_get_compat(dev);
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if (compat == NULL || strcmp(compat, "smu-sat") != 0)
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return (ENXIO);
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device_set_desc(dev, "SMU Satellite Sensors");
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return (0);
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}
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static int
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smusat_attach(device_t dev)
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{
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phandle_t child;
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struct smu_sensor *sens;
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struct smusat_softc *sc;
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struct sysctl_oid *sensroot_oid;
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struct sysctl_ctx_list *ctx;
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char type[32];
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int i;
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sc = device_get_softc(dev);
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sc->sc_nsensors = 0;
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sc->sc_last_update = 0;
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for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
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child = OF_peer(child))
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sc->sc_nsensors++;
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if (sc->sc_nsensors == 0) {
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device_printf(dev, "WARNING: No sensors detected!\n");
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return (-1);
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}
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sc->sc_sensors = malloc(sc->sc_nsensors * sizeof(struct smu_sensor),
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M_SMUSAT, M_WAITOK | M_ZERO);
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sens = sc->sc_sensors;
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sc->sc_nsensors = 0;
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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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for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
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child = OF_peer(child)) {
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char sysctl_name[40], sysctl_desc[40];
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const char *units;
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sens->reg = 0;
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OF_getprop(child, "reg", &sens->reg, sizeof(sens->reg));
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if (sens->reg < 0x30)
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continue;
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sens->reg -= 0x30;
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OF_getprop(child, "location", sens->location,
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sizeof(sens->location));
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OF_getprop(child, "device_type", type, sizeof(type));
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if (strcmp(type, "current-sensor") == 0) {
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sens->type = SMU_CURRENT_SENSOR;
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units = "mA";
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} else if (strcmp(type, "temp-sensor") == 0) {
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sens->type = SMU_TEMP_SENSOR;
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units = "C";
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} else if (strcmp(type, "voltage-sensor") == 0) {
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sens->type = SMU_VOLTAGE_SENSOR;
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units = "mV";
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} else if (strcmp(type, "power-sensor") == 0) {
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sens->type = SMU_POWER_SENSOR;
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units = "mW";
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} else {
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continue;
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}
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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, CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
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sc->sc_nsensors, smusat_sensor_sysctl, "I", sysctl_desc);
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sens++;
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sc->sc_nsensors++;
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}
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return (0);
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}
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static int
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smusat_updatecache(device_t dev)
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{
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uint8_t reg = 0x3f;
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struct smusat_softc *sc = device_get_softc(dev);
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struct iic_msg msgs[2] = {
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{0, IIC_M_WR | IIC_M_NOSTOP, 1, ®},
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{0, IIC_M_RD, 16, sc->sc_cache},
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};
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msgs[0].slave = msgs[1].slave = iicbus_get_addr(dev);
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sc->sc_last_update = time_uptime;
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return (iicbus_transfer(dev, msgs, 2));
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}
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static int
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smusat_sensor_read(device_t dev, struct smu_sensor *sens, int *val)
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{
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int value;
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struct smusat_softc *sc;
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sc = device_get_softc(dev);
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if (time_uptime - sc->sc_last_update > 1)
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smusat_updatecache(dev);
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value = (sc->sc_cache[sens->reg*2] << 8) +
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sc->sc_cache[sens->reg*2 + 1];
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switch (sens->type) {
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case SMU_TEMP_SENSOR:
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/* 16.16 */
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value <<= 10;
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/* Kill the .16 */
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value >>= 16;
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break;
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case SMU_VOLTAGE_SENSOR:
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/* 16.16 */
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value <<= 4;
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/* Kill the .16 */
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value >>= 16;
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break;
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case SMU_CURRENT_SENSOR:
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/* 16.16 */
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value <<= 8;
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/* Kill the .16 */
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value >>= 16;
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break;
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case SMU_POWER_SENSOR:
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/* Doesn't exist */
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break;
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}
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*val = value;
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return (0);
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}
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static int
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smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS)
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{
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device_t dev;
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struct smusat_softc *sc;
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struct smu_sensor *sens;
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int value, error;
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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 = smusat_sensor_read(dev, sens, &value);
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if (error != 0)
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return (error);
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error = sysctl_handle_int(oidp, &value, 0, req);
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return (error);
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}
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