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/* $NetBSD: owtemp.c,v 1.4 2006/07/10 16:28:44 thorpej Exp $ */
/* $OpenBSD: owtemp.c,v 1.1 2006/03/04 16:27:03 grange Exp $ */
/*
* Copyright (c) 2006 Alexander Yurchenko <grange@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.
*/
/*
* 1-Wire temperature family type device driver.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: owtemp.c,v 1.4 2006/07/10 16:28:44 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <dev/sysmon/sysmonvar.h>
#include <dev/onewire/onewiredevs.h>
#include <dev/onewire/onewirereg.h>
#include <dev/onewire/onewirevar.h>
#define DS_CMD_CONVERT 0x44
#define DS_CMD_READ_SCRATCHPAD 0xbe
struct owtemp_softc {
struct device sc_dev;
void * sc_onewire;
u_int64_t sc_rom;
struct envsys_tre_data sc_sensor[1];
struct envsys_basic_info sc_info[1];
struct sysmon_envsys sc_sysmon;
uint32_t (*sc_owtemp_decode)(const uint8_t *);
int sc_dying;
};
int owtemp_match(struct device *, struct cfdata *, void *);
void owtemp_attach(struct device *, struct device *, void *);
int owtemp_detach(struct device *, int);
int owtemp_activate(struct device *, enum devact);
void owtemp_update(void *);
CFATTACH_DECL(owtemp, sizeof(struct owtemp_softc),
owtemp_match, owtemp_attach, owtemp_detach, owtemp_activate);
extern struct cfdriver owtemp_cd;
static const struct onewire_matchfam owtemp_fams[] = {
{ ONEWIRE_FAMILY_DS1920 },
{ ONEWIRE_FAMILY_DS18B20 },
{ ONEWIRE_FAMILY_DS1822 },
};
static const struct envsys_range owtemp_ranges[] = {
{ 0, 1, ENVSYS_STEMP },
{ 1, 0, -1 },
};
static int owtemp_gtredata(struct sysmon_envsys *,
struct envsys_tre_data *);
static int owtemp_streinfo(struct sysmon_envsys *,
struct envsys_basic_info *);
static uint32_t owtemp_decode_ds18b20(const uint8_t *);
static uint32_t owtemp_decode_ds1920(const uint8_t *);
int
owtemp_match(struct device *parent, struct cfdata *cf, void *aux)
{
return (onewire_matchbyfam(aux, owtemp_fams,
sizeof(owtemp_fams) /sizeof(owtemp_fams[0])));
}
void
owtemp_attach(struct device *parent, struct device *self, void *aux)
{
struct owtemp_softc *sc = device_private(self);
struct onewire_attach_args *oa = aux;
prop_string_t desc;
sc->sc_onewire = oa->oa_onewire;
sc->sc_rom = oa->oa_rom;
switch(ONEWIRE_ROM_FAMILY_TYPE(sc->sc_rom)) {
case ONEWIRE_FAMILY_DS18B20:
case ONEWIRE_FAMILY_DS1822:
sc->sc_owtemp_decode = owtemp_decode_ds18b20;
break;
case ONEWIRE_FAMILY_DS1920:
sc->sc_owtemp_decode = owtemp_decode_ds1920;
break;
}
/* Initialize sensor */
sc->sc_sensor[0].sensor = sc->sc_info[0].sensor = 0;
sc->sc_sensor[0].validflags = ENVSYS_FVALID;
sc->sc_info[0].validflags = ENVSYS_FVALID;
sc->sc_sensor[0].warnflags = ENVSYS_WARN_OK;
sc->sc_sensor[0].units = sc->sc_info[0].units = ENVSYS_STEMP;
desc = prop_dictionary_get(device_properties(&sc->sc_dev),
"envsys-description");
if (desc != NULL &&
prop_object_type(desc) == PROP_TYPE_STRING &&
prop_string_size(desc) > 0)
strcpy(sc->sc_info[0].desc, prop_string_cstring_nocopy(desc));
else
strcpy(sc->sc_info[0].desc, sc->sc_dev.dv_xname);
/* Hook into system monitor. */
sc->sc_sysmon.sme_ranges = owtemp_ranges;
sc->sc_sysmon.sme_sensor_info = sc->sc_info;
sc->sc_sysmon.sme_sensor_data = sc->sc_sensor;
sc->sc_sysmon.sme_cookie = sc;
sc->sc_sysmon.sme_gtredata = owtemp_gtredata;
sc->sc_sysmon.sme_streinfo = owtemp_streinfo;
sc->sc_sysmon.sme_nsensors = 1;
sc->sc_sysmon.sme_envsys_version = 1000;
if (sysmon_envsys_register(&sc->sc_sysmon))
aprint_error("%s: unable to register with sysmon\n",
sc->sc_dev.dv_xname);
#if 0 /* Old OpenBSD code */
strlcpy(sc->sc_sensor.device, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensor.device));
sc->sc_sensor.type = SENSOR_TEMP;
strlcpy(sc->sc_sensor.desc, "Temp", sizeof(sc->sc_sensor.desc));
if (sensor_task_register(sc, owtemp_update, 5)) {
printf(": unable to register update task\n");
return;
}
sensor_add(&sc->sc_sensor);
#endif
printf("\n");
}
int
owtemp_detach(struct device *self, int flags)
{
struct owtemp_softc *sc = device_private(self);
sysmon_envsys_unregister(&sc->sc_sysmon);
return 0;
}
int
owtemp_activate(struct device *self, enum devact act)
{
struct owtemp_softc *sc = device_private(self);
switch (act) {
case DVACT_ACTIVATE:
return (EOPNOTSUPP);
case DVACT_DEACTIVATE:
sc->sc_dying = 1;
break;
}
return (0);
}
void
owtemp_update(void *arg)
{
struct owtemp_softc *sc = arg;
u_int8_t data[9];
onewire_lock(sc->sc_onewire, 0);
if (onewire_reset(sc->sc_onewire) != 0)
goto done;
onewire_matchrom(sc->sc_onewire, sc->sc_rom);
/*
* Start temperature conversion. The conversion takes up to 750ms.
* After sending the command, the data line must be held high for
* at least 750ms to provide power during the conversion process.
* As such, no other activity may take place on the 1-Wire bus for
* at least this period.
*/
onewire_write_byte(sc->sc_onewire, DS_CMD_CONVERT);
tsleep(sc, PRIBIO, "owtemp", hz);
if (onewire_reset(sc->sc_onewire) != 0)
goto done;
onewire_matchrom(sc->sc_onewire, sc->sc_rom);
/*
* The result of the temperature measurement is placed in the
* first two bytes of the scratchpad.
*/
onewire_write_byte(sc->sc_onewire, DS_CMD_READ_SCRATCHPAD);
onewire_read_block(sc->sc_onewire, data, 9);
#if 0
if (onewire_crc(data, 8) == data[8]) {
sc->sc_sensor.value = 273150000 +
(int)((u_int16_t)data[1] << 8 | data[0]) * 500000;
}
#endif
sc->sc_sensor[0].cur.data_us = sc->sc_owtemp_decode(data);
sc->sc_sensor[0].validflags |= ENVSYS_FCURVALID;
done:
onewire_unlock(sc->sc_onewire);
}
static int
owtemp_gtredata(struct sysmon_envsys *sme, struct envsys_tre_data *tred)
{
struct owtemp_softc *sc = sme->sme_cookie;
owtemp_update(sc);
*tred = sc->sc_sensor[tred->sensor];
return 0;
}
static int
owtemp_streinfo(struct sysmon_envsys *sme, struct envsys_basic_info *binfo)
{
struct owtemp_softc *sc = sme->sme_cookie;
onewire_lock(sc->sc_onewire,0); /* Also locks our instance */
memcpy(sc->sc_info[binfo->sensor].desc, binfo->desc,
sizeof(sc->sc_info[binfo->sensor].desc));
sc->sc_info[binfo->sensor].desc[
sizeof(sc->sc_info[binfo->sensor].desc) - 1] = '\0';
onewire_unlock(sc->sc_onewire);
binfo->validflags = ENVSYS_FVALID;
return 0;
}
static uint32_t
owtemp_decode_ds18b20(const uint8_t *buf)
{
int temp;
/*
* Sign-extend the MSB byte, and add in the fractions of a
* degree contained in the LSB (precision 1/16th DegC).
*/
temp = (int8_t)buf[1];
temp = (temp << 8) | buf[0];
/*
* Conversion to uK is simple.
*/
return (temp * 62500 + 273150000);
}
static uint32_t
owtemp_decode_ds1920(const uint8_t *buf)
{
int temp;
/*
* Sign-extend the MSB byte, and add in the fractions of a
* degree contained in the LSB (precision 1/2 DegC).
*/
temp = (int8_t)buf[1];
temp = (temp << 8) | buf[0];
/* Convert to uK */
return (temp * 500000 + 273150000);
}
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