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/* $OpenBSD: ad741x.c,v 1.13 2007/10/20 22:06:43 cnst 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>
/* AD741x registers */
#define AD741X_TEMP 0x00
#define AD741X_CONFIG 0x01
#define AD741X_THYST 0x02
#define AD741X_TOTI 0x03
#define AD741X_ADC 0x04
#define AD741X_CONFIG2 0x05
#define AD741X_CONFMASK 0xe0
/* Sensors */
#define ADC_TEMP 0
#define ADC_ADC0 1
#define ADC_ADC1 2
#define ADC_ADC2 3
#define ADC_ADC3 4
#define ADC_MAX_SENSORS 5
struct adc_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
int sc_chip;
u_int8_t sc_config;
struct ksensor sc_sensor[ADC_MAX_SENSORS];
struct ksensordev sc_sensordev;
};
int adc_match(struct device *, void *, void *);
void adc_attach(struct device *, struct device *, void *);
void adc_refresh(void *);
struct cfattach adc_ca = {
sizeof(struct adc_softc), adc_match, adc_attach
};
struct cfdriver adc_cd = {
NULL, "adc", DV_DULL
};
int
adc_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
if (strcmp(ia->ia_name, "ad7417") == 0 ||
strcmp(ia->ia_name, "ad7418") == 0)
return (1);
return (0);
}
void
adc_attach(struct device *parent, struct device *self, void *aux)
{
struct adc_softc *sc = (struct adc_softc *)self;
struct i2c_attach_args *ia = aux;
u_int8_t cmd, data;
int nsens = 0, i;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
printf(": %s", ia->ia_name);
sc->sc_chip = 0;
if (strcmp(ia->ia_name, "ad7417") == 0)
sc->sc_chip = 7417;
if (strcmp(ia->ia_name, "ad7418") == 0)
sc->sc_chip = 7418;
if (sc->sc_chip != 0) {
cmd = AD741X_CONFIG2;
data = 0;
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
printf(", config2 reset failed\n");
return;
}
}
cmd = AD741X_CONFIG;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
printf(", config reset failed\n");
return;
}
data &= 0xfe;
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
printf(", config reset failed\n");
return;
}
sc->sc_config = data;
/* Initialize sensor data. */
strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensordev.xname));
sc->sc_sensor[ADC_TEMP].type = SENSOR_TEMP;
strlcpy(sc->sc_sensor[ADC_TEMP].desc, "Internal",
sizeof(sc->sc_sensor[ADC_TEMP].desc));
nsens = 1;
if (sc->sc_chip == 7417 || sc->sc_chip == 7418) {
sc->sc_sensor[ADC_ADC0].type = SENSOR_INTEGER;
nsens++;
}
if (sc->sc_chip == 7417 || sc->sc_chip == 7418) {
sc->sc_sensor[ADC_ADC1].type = SENSOR_INTEGER;
sc->sc_sensor[ADC_ADC2].type = SENSOR_INTEGER;
sc->sc_sensor[ADC_ADC3].type = SENSOR_INTEGER;
nsens += 3;
}
if (sensor_task_register(sc, adc_refresh, 5) == NULL) {
printf(", unable to register update task\n");
return;
}
sensor_attach(&sc->sc_sensordev, &sc->sc_sensor[0]);
if (sc->sc_chip == 7417 || sc->sc_chip == 7418)
sensor_attach(&sc->sc_sensordev, &sc->sc_sensor[1]);
if (sc->sc_chip == 7417)
for (i = 2; i < nsens; i++)
sensor_attach(&sc->sc_sensordev, &sc->sc_sensor[i]);
sensordev_install(&sc->sc_sensordev);
printf("\n");
}
void
adc_refresh(void *arg)
{
struct adc_softc *sc = arg;
u_int8_t cmd, data[2], reg;
int i;
iic_acquire_bus(sc->sc_tag, 0);
reg = (sc->sc_config & AD741X_CONFMASK) | (0 << 5);
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, ®, sizeof reg, 0))
goto done;
delay(1000);
cmd = AD741X_TEMP;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0))
goto done;
sc->sc_sensor[ADC_TEMP].value = 273150000 +
((data[0] << 8 | data[1]) >> 6) * 250000;
if (sc->sc_chip == 0)
goto done;
if (sc->sc_chip == 7418) {
reg = (reg & AD741X_CONFMASK) | (4 << 5);
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, ®, sizeof reg, 0))
goto done;
delay(1000);
cmd = AD741X_ADC;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0))
goto done;
sc->sc_sensor[ADC_ADC0].value =
(data[0] << 8 | data[1]) >> 6;
goto done;
}
for (i = 0; i < 4; i++) {
reg = (reg & AD741X_CONFMASK) | (i << 5);
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, ®, sizeof reg, 0))
goto done;
delay(1000);
cmd = AD741X_ADC;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0))
goto done;
sc->sc_sensor[ADC_ADC0 + i].value =
(data[0] << 8 | data[1]) >> 6;
}
done:
iic_release_bus(sc->sc_tag, 0);
}
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