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/* $OpenBSD: tda.c,v 1.1 2008/02/12 10:12:14 robert Exp $ */
/*
* Copyright (c) 2008 Robert Nagy <robert@openbsd.org>
* Copyright (c) 2008 Mark Kettenis <kettenis@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/sensors.h>
#include <dev/i2c/i2cvar.h>
/* fan control registers */
#define TDA_SYSFAN_REG 0xf0
#define TDA_CPUFAN_REG 0xf2
#define TDA_PSFAN_REG 0xf4
#define TDA_FANSPEED_MIN 0x0c
#define TDA_FANSPEED_MAX 0x3f
#define TDA_PSFAN_ON 0x1f
#define TDA_PSFAN_OFF 0x00
/* Internal and External temperature senor numbers */
#define SENSOR_TEMP_EXT 0
#define SENSOR_TEMP_INT 1
#define CPU_TEMP_MAX (67 * 1000000 + 273150000)
#define CPU_TEMP_MIN (57 * 1000000 + 273150000)
#define SYS_TEMP_MAX (30 * 1000000 + 273150000)
#define SYS_TEMP_MIN (20 * 1000000 + 273150000)
struct tda_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
u_int16_t sc_cfan_speed; /* current CPU fan speed */
u_int16_t sc_sfan_speed; /* current SYS fan speed */
int sc_nsensors;
};
#define DEVNAME(_s) ((_s)->sc_dev.dv_xname)
int tda_match(struct device *, void *, void *);
void tda_attach(struct device *, struct device *, void *);
void tda_setspeed(struct tda_softc *);
void tda_adjust(void *);
struct cfattach tda_ca = {
sizeof(struct tda_softc), tda_match, tda_attach
};
struct cfdriver tda_cd = {
NULL, "tda", DV_DULL
};
int
tda_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
if (strcmp(ia->ia_name, "tda8444") != 0)
return (0);
return (1);
}
void
tda_attach(struct device *parent, struct device *self, void *aux)
{
struct tda_softc *sc = (struct tda_softc *)self;
struct i2c_attach_args *ia = aux;
int i;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
printf("\n");
/*
* Set the fans to maximum speed and save the power levels;
* the controller is write-only.
*/
sc->sc_cfan_speed = sc->sc_sfan_speed = TDA_FANSPEED_MAX;
tda_setspeed(sc);
/* Get the number of sensor devices. */
for (i = 0; i < MAXSENSORDEVICES; i++) {
if (sensordev_get(i) == NULL)
break;
}
sc->sc_nsensors = i;
if (sensor_task_register(sc, tda_adjust, 10) == NULL) {
printf("%s: unable to register update task\n", DEVNAME(sc));
return;
}
}
void
tda_setspeed(struct tda_softc *sc)
{
u_int8_t cmd[2];
if (sc->sc_cfan_speed < TDA_FANSPEED_MIN)
sc->sc_cfan_speed = TDA_FANSPEED_MIN;
if (sc->sc_sfan_speed < TDA_FANSPEED_MIN)
sc->sc_sfan_speed = TDA_FANSPEED_MIN;
if (sc->sc_cfan_speed > TDA_FANSPEED_MAX)
sc->sc_cfan_speed = TDA_FANSPEED_MAX;
if (sc->sc_sfan_speed > TDA_FANSPEED_MAX)
sc->sc_sfan_speed = TDA_FANSPEED_MAX;
iic_acquire_bus(sc->sc_tag, 0);
cmd[0] = TDA_CPUFAN_REG;
cmd[1] = sc->sc_cfan_speed;
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, sizeof(cmd), NULL, 0, 0)) {
printf("%s: cannot write cpu-fan register\n",
DEVNAME(sc));
iic_release_bus(sc->sc_tag, 0);
return;
}
cmd[0] = TDA_SYSFAN_REG;
cmd[1] = sc->sc_sfan_speed;
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, sizeof(cmd), NULL, 0, 0)) {
printf("%s: cannot write system-fan register\n",
DEVNAME(sc));
iic_release_bus(sc->sc_tag, 0);
return;
}
iic_release_bus(sc->sc_tag, 0);
#if 0
printf("%s: changed fan speed to cpu=%d system=%d\n",
DEVNAME(sc), sc->sc_cfan_speed, sc->sc_sfan_speed);
#endif
}
void
tda_adjust(void *v)
{
struct tda_softc *sc = v;
struct ksensor *ks;
u_int64_t ctemp, stemp;
int i;
/* Default to running the fans at maximum speed. */
sc->sc_cfan_speed = sc->sc_sfan_speed = TDA_FANSPEED_MAX;
ctemp = stemp = 0;
for (i = 0; i < sc->sc_nsensors; i++) {
ks = sensor_find(i, SENSOR_TEMP, SENSOR_TEMP_EXT);
if (ks == NULL) {
printf("%s: failed to get external sensor\n",
DEVNAME(sc));
goto out;
}
ctemp = MAX(ctemp, ks->value);
ks = sensor_find(i, SENSOR_TEMP, SENSOR_TEMP_INT);
if (ks == NULL) {
printf("%s: failed to get internal sensors\n",
DEVNAME(sc));
goto out;
}
stemp = MAX(stemp, ks->value);
}
if (ctemp < CPU_TEMP_MIN)
sc->sc_cfan_speed = TDA_FANSPEED_MIN;
else if (ctemp < CPU_TEMP_MAX)
sc->sc_cfan_speed = TDA_FANSPEED_MIN +
(ctemp - CPU_TEMP_MIN) *
(TDA_FANSPEED_MAX - TDA_FANSPEED_MIN) /
(CPU_TEMP_MAX - CPU_TEMP_MIN);
if (stemp < SYS_TEMP_MIN)
sc->sc_sfan_speed = TDA_FANSPEED_MIN;
else if (stemp < SYS_TEMP_MAX)
sc->sc_sfan_speed = TDA_FANSPEED_MIN +
(stemp - SYS_TEMP_MIN) *
(TDA_FANSPEED_MAX - TDA_FANSPEED_MIN) /
(SYS_TEMP_MAX - SYS_TEMP_MIN);
out:
tda_setspeed(sc);
}
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