freebsd-dev/sys/powerpc/powermac/smusat.c
2010-06-05 17:51:37 +00:00

263 lines
6.1 KiB
C

/*-
* 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>
struct smu_sensor {
cell_t reg;
char location[32];
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);
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->reg = 0;
OF_getprop(child, "reg", &sens->reg, sizeof(sens->reg));
if (sens->reg < 0x30)
continue;
sens->reg -= 0x30;
OF_getprop(child, "location", sens->location,
sizeof(sens->location));
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->location); i++) {
sysctl_name[i] = tolower(sens->location[i]);
if (isspace(sysctl_name[i]))
sysctl_name[i] = '_';
}
sysctl_name[i] = 0;
sprintf(sysctl_desc,"%s (%s)", sens->location, 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, "I", sysctl_desc);
sens++;
sc->sc_nsensors++;
}
return (0);
}
static int
smusat_updatecache(device_t dev)
{
uint8_t reg = 0x3f;
struct smusat_softc *sc = device_get_softc(dev);
struct iic_msg msgs[2] = {
{0, IIC_M_WR | IIC_M_NOSTOP, 1, &reg},
{0, IIC_M_RD, 16, sc->sc_cache},
};
msgs[0].slave = msgs[1].slave = iicbus_get_addr(dev);
sc->sc_last_update = time_uptime;
return (iicbus_transfer(dev, msgs, 2));
}
static int
smusat_sensor_read(device_t dev, struct smu_sensor *sens, int *val)
{
int value;
struct smusat_softc *sc;
sc = device_get_softc(dev);
if (time_uptime - sc->sc_last_update > 1)
smusat_updatecache(dev);
value = (sc->sc_cache[sens->reg*2] << 8) +
sc->sc_cache[sens->reg*2 + 1];
switch (sens->type) {
case SMU_TEMP_SENSOR:
/* 16.16 */
value <<= 10;
/* Kill the .16 */
value >>= 16;
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;
}
*val = value;
return (0);
}
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];
error = smusat_sensor_read(dev, sens, &value);
if (error != 0)
return (error);
error = sysctl_handle_int(oidp, &value, 0, req);
return (error);
}