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/* $OpenBSD: maxim6690.c,v 1.2 2005/11/16 16:27:53 kettenis Exp $ */
/*
* Copyright (c) 2005 Theo de Raadt
*
* 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/device.h>
#include <sys/sensors.h>
#include <dev/i2c/i2cvar.h>
/* Maxim MAX6642/90 registers */
#define MAX6690_INT_TEMP 0x00
#define MAX6690_EXT_TEMP 0x01
#define MAX6690_INT_TEMP2 0x10
#define MAX6690_EXT_TEMP2 0x11
#define MAX6690_STATUS 0x02
#define MAX6690_DEVID 0xfe
#define MAX6690_REVISION 0xff /* absent on MAX6642 */
#define MAX6642_TEMP_INVALID 0xff /* sensor disconnected */
#define MAX6690_TEMP_INVALID 0x80 /* sensor disconnected */
#define MAX6642_TEMP2_MASK 0xc0 /* significant bits */
#define MAX6690_TEMP2_MASK 0xe0 /* significant bits */
/* Sensors */
#define MAXTMP_INT 0
#define MAXTMP_EXT 1
#define MAXTMP_NUM_SENSORS 2
struct maxtmp_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
u_int8_t sc_temp_invalid;
u_int8_t sc_temp2_mask;
struct sensor sc_sensor[MAXTMP_NUM_SENSORS];
};
int maxtmp_match(struct device *, void *, void *);
void maxtmp_attach(struct device *, struct device *, void *);
int maxtmp_check(struct i2c_attach_args *, u_int8_t *, u_int8_t *);
void maxtmp_refresh(void *);
struct cfattach maxtmp_ca = {
sizeof(struct maxtmp_softc), maxtmp_match, maxtmp_attach
};
struct cfdriver maxtmp_cd = {
NULL, "maxtmp", DV_DULL
};
int
maxtmp_check(struct i2c_attach_args *ia, u_int8_t *idp, u_int8_t *revp)
{
u_int8_t cmd, id, rev;
iic_acquire_bus(ia->ia_tag, 0);
cmd = MAX6690_DEVID;
if (iic_exec(ia->ia_tag, I2C_OP_READ_WITH_STOP,
ia->ia_addr, &cmd, sizeof cmd, &id, sizeof id, 0)) {
iic_release_bus(ia->ia_tag, 0);
return 0;
}
cmd = MAX6690_REVISION;
if (iic_exec(ia->ia_tag, I2C_OP_READ_WITH_STOP,
ia->ia_addr, &cmd, sizeof cmd, &rev, sizeof rev, 0)) {
iic_release_bus(ia->ia_tag, 0);
return 0;
}
iic_release_bus(ia->ia_tag, 0);
*idp = id;
*revp = rev;
if (id == 0x4d)
return (1);
return (0);
}
int
maxtmp_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
u_int8_t id, rev;
if (ia->ia_compat) {
if (strcmp(ia->ia_compat, "max6642") == 0 ||
strcmp(ia->ia_compat, "max6690") == 0)
return (1);
return (0);
}
return (maxtmp_check(ia, &id, &rev));
}
void
maxtmp_attach(struct device *parent, struct device *self, void *aux)
{
struct maxtmp_softc *sc = (struct maxtmp_softc *)self;
struct i2c_attach_args *ia = aux;
u_int8_t id, rev;
int i;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
if (maxtmp_check(ia, &id, &rev) == 0) {
printf(": unknown Device ID 0x%x\n", id);
return;
}
if (ia->ia_compat && strcmp(ia->ia_compat, "max6642") == 0) {
sc->sc_temp_invalid = MAX6642_TEMP_INVALID;
sc->sc_temp2_mask = MAX6642_TEMP2_MASK;
printf(": MAX6642");
} else {
sc->sc_temp_invalid = MAX6690_TEMP_INVALID;
sc->sc_temp2_mask = MAX6690_TEMP2_MASK;
printf(": MAX6690 rev 0x%x", rev);
}
/* Initialize sensor data. */
for (i = 0; i < MAXTMP_NUM_SENSORS; i++)
strlcpy(sc->sc_sensor[i].device, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensor[i].device));
sc->sc_sensor[MAXTMP_INT].type = SENSOR_TEMP;
strlcpy(sc->sc_sensor[MAXTMP_INT].desc, "Internal",
sizeof(sc->sc_sensor[MAXTMP_INT].desc));
sc->sc_sensor[MAXTMP_EXT].type = SENSOR_TEMP;
strlcpy(sc->sc_sensor[MAXTMP_EXT].desc, "External",
sizeof(sc->sc_sensor[MAXTMP_EXT].desc));
if (sensor_task_register(sc, maxtmp_refresh, 5)) {
printf(", unable to register update task\n");
return;
}
for (i = 0; i < MAXTMP_NUM_SENSORS; i++)
SENSOR_ADD(&sc->sc_sensor[i]);
printf("\n");
}
void maxtmp_readport(struct maxtmp_softc *, u_int8_t, u_int8_t, int);
void
maxtmp_readport(struct maxtmp_softc *sc, u_int8_t cmd1, u_int8_t cmd2,
int index)
{
u_int8_t data, data2;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd1, sizeof cmd1, &data, sizeof data, 0))
goto invalid;
if (data == sc->sc_temp_invalid)
goto invalid;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd2, sizeof cmd2, &data2, sizeof data2, 0))
goto invalid;
/* Set any meaningless bits to zero. */
data2 &= sc->sc_temp2_mask;
sc->sc_sensor[index].value = 273150000 +
1000000 * data + (data2 >> 5) * 1000000 / 8;
return;
invalid:
sc->sc_sensor[index].flags |= SENSOR_FINVALID;
}
void
maxtmp_refresh(void *arg)
{
struct maxtmp_softc *sc = arg;
iic_acquire_bus(sc->sc_tag, 0);
maxtmp_readport(sc, MAX6690_INT_TEMP, MAX6690_INT_TEMP2, MAXTMP_INT);
maxtmp_readport(sc, MAX6690_EXT_TEMP, MAX6690_EXT_TEMP2, MAXTMP_EXT);
iic_release_bus(sc->sc_tag, 0);
}
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