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/* $OpenBSD: pcf8591_envctrl.c,v 1.4 2007/10/22 22:21:52 kettenis Exp $ */
/*
* Copyright (c) 2006 Damien Miller <djm@openbsd.org>
* Copyright (c) 2007 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/device.h>
#include <sys/sensors.h>
#include <dev/ofw/openfirm.h>
#include <dev/i2c/i2cvar.h>
#define PCF8591_CHANNELS 4
#define PCF8591_CTRL_CH0 0x00
#define PCF8591_CTRL_CH1 0x01
#define PCF8591_CTRL_CH2 0x02
#define PCF8591_CTRL_CH3 0x03
#define PCF8591_CTRL_AUTOINC 0x04
#define PCF8591_CTRL_OSCILLATOR 0x40
struct ecadc_channel {
u_int chan_num;
struct ksensor chan_sensor;
int64_t chan_factor;
int64_t chan_min;
int64_t chan_warn;
int64_t chan_crit;
};
struct ecadc_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
u_char sc_xlate[256];
u_int sc_nchan;
struct ecadc_channel sc_channels[PCF8591_CHANNELS];
struct ksensordev sc_sensordev;
};
int ecadc_match(struct device *, void *, void *);
void ecadc_attach(struct device *, struct device *, void *);
void ecadc_refresh(void *);
struct cfattach ecadc_ca = {
sizeof(struct ecadc_softc), ecadc_match, ecadc_attach
};
struct cfdriver ecadc_cd = {
NULL, "ecadc", DV_DULL
};
int
ecadc_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
if (strcmp(ia->ia_name, "ecadc") != 0)
return (0);
return (1);
}
void
ecadc_attach(struct device *parent, struct device *self, void *aux)
{
struct ecadc_softc *sc = (struct ecadc_softc *)self;
u_char term[256];
u_char *cp, *desc;
int64_t min, warn, crit, num, den;
u_int8_t junk[PCF8591_CHANNELS + 1];
struct i2c_attach_args *ia = aux;
struct ksensor *sensor;
int tlen, xlen, addr, chan, node = *(int *)ia->ia_cookie;
u_int i;
if ((tlen = OF_getprop(node, "thermisters", term,
sizeof(term))) < 0) {
printf(": couldn't find \"thermisters\" property\n");
return;
}
if ((xlen = OF_getprop(node, "cpu-temp-factors", &sc->sc_xlate[2],
sizeof(sc->sc_xlate) - 2)) < 0) {
printf(": couldn't find \"cpu-temp-factors\" property\n");
return;
}
sc->sc_xlate[0] = sc->sc_xlate[1] = sc->sc_xlate[2];
cp = term;
while (cp < term + tlen) {
addr = cp[0] << 24 | cp[1] << 16 | cp[2] << 8 | cp[3]; cp += 4;
chan = cp[0] << 24 | cp[1] << 16 | cp[2] << 8 | cp[3]; cp += 4;
min = cp[0] << 24 | cp[1] << 16 | cp[2] << 8 | cp[3]; cp += 4;
warn = cp[0] << 24 | cp[1] << 16 | cp[2] << 8 | cp[3]; cp += 4;
crit = cp[0] << 24 | cp[1] << 16 | cp[2] << 8 | cp[3]; cp += 4;
num = cp[0] << 24 | cp[1] << 16 | cp[2] << 8 | cp[3]; cp += 4;
den = cp[0] << 24 | cp[1] << 16 | cp[2] << 8 | cp[3]; cp += 4;
desc = cp;
while (*cp++);
if (addr != (ia->ia_addr << 1))
continue;
if (num == 0 || den == 0)
num = den = 1;
sensor = &sc->sc_channels[sc->sc_nchan].chan_sensor;
sensor->type = SENSOR_TEMP;
strlcpy(sensor->desc, desc, sizeof(sensor->desc));
sc->sc_channels[sc->sc_nchan].chan_num = chan;
if (num == 1 && den == 1)
sc->sc_channels[sc->sc_nchan].chan_factor = 0;
else
sc->sc_channels[sc->sc_nchan].chan_factor =
(1000000 * num) / den;
sc->sc_channels[sc->sc_nchan].chan_min =
273150000 + 1000000 * min;
sc->sc_channels[sc->sc_nchan].chan_warn =
273150000 + 1000000 * warn;
sc->sc_channels[sc->sc_nchan].chan_crit =
273150000 + 1000000 * crit;
sc->sc_nchan++;
}
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
iic_acquire_bus(sc->sc_tag, 0);
/* Try a read now, so we can fail if it doesn't work */
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
NULL, 0, junk, sc->sc_nchan + 1, 0)) {
printf(": read failed\n");
iic_release_bus(sc->sc_tag, 0);
return;
}
iic_release_bus(sc->sc_tag, 0);
/* Initialize sensor data. */
strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensordev.xname));
for (i = 0; i < sc->sc_nchan; i++)
sensor_attach(&sc->sc_sensordev,
&sc->sc_channels[i].chan_sensor);
if (sensor_task_register(sc, ecadc_refresh, 5) == NULL) {
printf(": unable to register update task\n");
return;
}
sensordev_install(&sc->sc_sensordev);
printf("\n");
}
void
ecadc_refresh(void *arg)
{
struct ecadc_softc *sc = arg;
u_int i;
u_int8_t data[PCF8591_CHANNELS + 1];
u_int8_t ctrl = PCF8591_CTRL_CH0 | PCF8591_CTRL_AUTOINC |
PCF8591_CTRL_OSCILLATOR;
iic_acquire_bus(sc->sc_tag, 0);
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr,
&ctrl, 1, NULL, 0, 0)) {
iic_release_bus(sc->sc_tag, 0);
return;
}
/* NB: first byte out is stale, so read num_channels + 1 */
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
NULL, 0, data, PCF8591_CHANNELS + 1, 0)) {
iic_release_bus(sc->sc_tag, 0);
return;
}
iic_release_bus(sc->sc_tag, 0);
/* We only support temperature channels. */
for (i = 0; i < sc->sc_nchan; i++) {
struct ecadc_channel *chp = &sc->sc_channels[i];
if (chp->chan_factor == 0)
chp->chan_sensor.value = 273150000 + 1000000 *
sc->sc_xlate[data[1 + chp->chan_num]];
else
chp->chan_sensor.value = 273150000 +
chp->chan_factor * data[1 + chp->chan_num];
chp->chan_sensor.status = SENSOR_S_OK;
if (chp->chan_sensor.value < chp->chan_min)
chp->chan_sensor.status = SENSOR_S_UNKNOWN;
if (chp->chan_sensor.value > chp->chan_warn)
chp->chan_sensor.status = SENSOR_S_WARN;
if (chp->chan_sensor.value > chp->chan_crit)
chp->chan_sensor.status = SENSOR_S_CRIT;
}
}
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