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- /*-
- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
- *
- * Copyright (c) 2010 Nathan Whitehorn
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #include <sys/param.h>
- #include <sys/systm.h>
- #include <sys/module.h>
- #include <sys/bus.h>
- #include <sys/conf.h>
- #include <sys/cpu.h>
- #include <sys/ctype.h>
- #include <sys/kernel.h>
- #include <sys/sysctl.h>
- #include <dev/iicbus/iicbus.h>
- #include <dev/iicbus/iiconf.h>
- #include <dev/ofw/ofw_bus.h>
- #include <dev/ofw/openfirm.h>
- #include <powerpc/powermac/powermac_thermal.h>
- struct smu_sensor {
- struct pmac_therm therm;
- device_t dev;
- cell_t reg;
- enum {
- SMU_CURRENT_SENSOR,
- SMU_VOLTAGE_SENSOR,
- SMU_POWER_SENSOR,
- SMU_TEMP_SENSOR
- } type;
- };
- static int smusat_probe(device_t);
- static int smusat_attach(device_t);
- static int smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS);
- static int smusat_sensor_read(struct smu_sensor *sens);
- static MALLOC_DEFINE(M_SMUSAT, "smusat", "SMU Sattelite Sensors");
- static device_method_t smusat_methods[] = {
- /* Device interface */
- DEVMETHOD(device_probe, smusat_probe),
- DEVMETHOD(device_attach, smusat_attach),
- { 0, 0 },
- };
- struct smusat_softc {
- struct smu_sensor *sc_sensors;
- int sc_nsensors;
- uint8_t sc_cache[16];
- time_t sc_last_update;
- };
- static driver_t smusat_driver = {
- "smusat",
- smusat_methods,
- sizeof(struct smusat_softc)
- };
- static devclass_t smusat_devclass;
- DRIVER_MODULE(smusat, iicbus, smusat_driver, smusat_devclass, 0, 0);
- static int
- smusat_probe(device_t dev)
- {
- const char *compat = ofw_bus_get_compat(dev);
- if (compat == NULL || strcmp(compat, "smu-sat") != 0)
- return (ENXIO);
- device_set_desc(dev, "SMU Satellite Sensors");
- return (0);
- }
- static int
- smusat_attach(device_t dev)
- {
- phandle_t child;
- struct smu_sensor *sens;
- struct smusat_softc *sc;
- struct sysctl_oid *sensroot_oid;
- struct sysctl_ctx_list *ctx;
- char type[32];
- int i;
- sc = device_get_softc(dev);
- sc->sc_nsensors = 0;
- sc->sc_last_update = 0;
- for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
- child = OF_peer(child))
- sc->sc_nsensors++;
- if (sc->sc_nsensors == 0) {
- device_printf(dev, "WARNING: No sensors detected!\n");
- return (-1);
- }
-
- sc->sc_sensors = malloc(sc->sc_nsensors * sizeof(struct smu_sensor),
- M_SMUSAT, M_WAITOK | M_ZERO);
- sens = sc->sc_sensors;
- sc->sc_nsensors = 0;
- ctx = device_get_sysctl_ctx(dev);
- sensroot_oid = device_get_sysctl_tree(dev);
- for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
- child = OF_peer(child)) {
- char sysctl_name[40], sysctl_desc[40];
- const char *units;
- sens->dev = dev;
- sens->reg = 0;
- OF_getprop(child, "reg", &sens->reg, sizeof(sens->reg));
- if (sens->reg < 0x30)
- continue;
- sens->reg -= 0x30;
- OF_getprop(child, "zone", &sens->therm.zone, sizeof(int));
- OF_getprop(child, "location", sens->therm.name,
- sizeof(sens->therm.name));
- OF_getprop(child, "device_type", type, sizeof(type));
- if (strcmp(type, "current-sensor") == 0) {
- sens->type = SMU_CURRENT_SENSOR;
- units = "mA";
- } else if (strcmp(type, "temp-sensor") == 0) {
- sens->type = SMU_TEMP_SENSOR;
- units = "C";
- } else if (strcmp(type, "voltage-sensor") == 0) {
- sens->type = SMU_VOLTAGE_SENSOR;
- units = "mV";
- } else if (strcmp(type, "power-sensor") == 0) {
- sens->type = SMU_POWER_SENSOR;
- units = "mW";
- } else {
- continue;
- }
- for (i = 0; i < strlen(sens->therm.name); i++) {
- sysctl_name[i] = tolower(sens->therm.name[i]);
- if (isspace(sysctl_name[i]))
- sysctl_name[i] = '_';
- }
- sysctl_name[i] = 0;
- sprintf(sysctl_desc,"%s (%s)", sens->therm.name, units);
- SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(sensroot_oid), OID_AUTO,
- sysctl_name, CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
- sc->sc_nsensors, smusat_sensor_sysctl,
- (sens->type == SMU_TEMP_SENSOR) ? "IK" : "I", sysctl_desc);
- if (sens->type == SMU_TEMP_SENSOR) {
- /* Make up some numbers */
- sens->therm.target_temp = 500 + 2731; /* 50 C */
- sens->therm.max_temp = 900 + 2731; /* 90 C */
- sens->therm.read =
- (int (*)(struct pmac_therm *))smusat_sensor_read;
- pmac_thermal_sensor_register(&sens->therm);
- }
- sens++;
- sc->sc_nsensors++;
- }
- return (0);
- }
- static int
- smusat_updatecache(device_t dev)
- {
- uint8_t reg = 0x3f;
- uint8_t value[16];
- struct smusat_softc *sc = device_get_softc(dev);
- int error;
- struct iic_msg msgs[2] = {
- {0, IIC_M_WR | IIC_M_NOSTOP, 1, ®},
- {0, IIC_M_RD, 16, value},
- };
- msgs[0].slave = msgs[1].slave = iicbus_get_addr(dev);
- error = iicbus_transfer(dev, msgs, 2);
- if (error)
- return (error);
- sc->sc_last_update = time_uptime;
- memcpy(sc->sc_cache, value, sizeof(value));
- return (0);
- }
- static int
- smusat_sensor_read(struct smu_sensor *sens)
- {
- int value, error;
- device_t dev;
- struct smusat_softc *sc;
- dev = sens->dev;
- sc = device_get_softc(dev);
- error = 0;
- if (time_uptime - sc->sc_last_update > 1)
- error = smusat_updatecache(dev);
- if (error)
- return (-error);
- value = (sc->sc_cache[sens->reg*2] << 8) +
- sc->sc_cache[sens->reg*2 + 1];
- if (value == 0xffff) {
- sc->sc_last_update = 0; /* Result was bad, don't cache */
- return (-EINVAL);
- }
- switch (sens->type) {
- case SMU_TEMP_SENSOR:
- /* 16.16 */
- value <<= 10;
- /* From 16.16 to 0.1 C */
- value = 10*(value >> 16) + ((10*(value & 0xffff)) >> 16) + 2731;
- break;
- case SMU_VOLTAGE_SENSOR:
- /* 16.16 */
- value <<= 4;
- /* Kill the .16 */
- value >>= 16;
- break;
- case SMU_CURRENT_SENSOR:
- /* 16.16 */
- value <<= 8;
- /* Kill the .16 */
- value >>= 16;
- break;
- case SMU_POWER_SENSOR:
- /* Doesn't exist */
- break;
- }
- return (value);
- }
- static int
- smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS)
- {
- device_t dev;
- struct smusat_softc *sc;
- struct smu_sensor *sens;
- int value, error;
- dev = arg1;
- sc = device_get_softc(dev);
- sens = &sc->sc_sensors[arg2];
- value = smusat_sensor_read(sens);
- if (value < 0)
- return (EBUSY);
- error = sysctl_handle_int(oidp, &value, 0, req);
- return (error);
- }
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