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/* $NetBSD: dstemp.c,v 1.14 2021/06/21 03:12:54 christos Exp $ */
/*-
* Copyright (c) 2018 Michael Lorenz
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: dstemp.c,v 1.14 2021/06/21 03:12:54 christos Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <dev/i2c/i2cvar.h>
#include <dev/sysmon/sysmonvar.h>
#define DSTEMP_CMD_START 0x51 /* command, no data */
#define DSTEMP_CMD_POR 0x54 /* command, no data */
#define DSTEMP_CMD_STOP 0x22 /* command, no data */
#define DSTEMP_TCURRENT 0xaa /* current temperature, 2 bytes */
#define DSTEMP_THIGH 0xa1 /* high threshold, 2 bytes */
#define DSTEMP_TLOW 0xa2 /* low threshold, 2 bytes */
#define DSTEMP_CONFIG 0xac /* 1 byte */
#define DSTEMP_1SHOT 0x01
#define DSTEMP_POL 0x02 /* Tout polarity, 1 - active high */
#define DSTEMP_8BIT 0x00
#define DSTEMP_10BIT 0x04
#define DSTEMP_11BIT 0x08
#define DSTEMP_12BIT 0x0c
#define DSTEMP_RES_MASK 0x0c
#define DSTEMP_NVB 0x10 /* EEPROM busy */
#define DSTEMP_TLF 0x20 /* temperature low flag */
#define DSTEMP_THF 0x40 /* temperature high flag */
#define DSTEMP_DONE 0x80
struct dstemp_softc {
device_t sc_dev;
i2c_tag_t sc_i2c;
i2c_addr_t sc_addr;
prop_dictionary_t sc_prop;
struct sysmon_envsys *sc_sme;
envsys_data_t sc_sensor_temp;
};
static int dstemp_match(device_t, cfdata_t, void *);
static void dstemp_attach(device_t, device_t, void *);
static void dstemp_sensors_refresh(struct sysmon_envsys *, envsys_data_t *);
static void dstemp_init(struct dstemp_softc *);
CFATTACH_DECL_NEW(dstemp, sizeof(struct dstemp_softc),
dstemp_match, dstemp_attach, NULL, NULL);
static const struct device_compatible_entry compat_data[] = {
{ .compat = "dallas,ds1631" },
{ .compat = "ds1631" },
DEVICE_COMPAT_EOL
};
static int
dstemp_match(device_t parent, cfdata_t match, void *aux)
{
struct i2c_attach_args *ia = aux;
int match_result;
if (iic_use_direct_match(ia, match, compat_data, &match_result))
return match_result;
if ((ia->ia_addr & 0xf8) == 0x48)
return I2C_MATCH_ADDRESS_ONLY;
return 0;
}
static void
dstemp_attach(device_t parent, device_t self, void *aux)
{
struct dstemp_softc *sc = device_private(self);
struct i2c_attach_args *ia = aux;
char name[64] = "temperature";
const char *desc;
sc->sc_dev = self;
sc->sc_i2c = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
sc->sc_prop = ia->ia_prop;
prop_object_retain(sc->sc_prop);
aprint_naive("\n");
aprint_normal(": DS1361\n");
dstemp_init(sc);
sc->sc_sme = sysmon_envsys_create();
sc->sc_sme->sme_name = device_xname(self);
sc->sc_sme->sme_cookie = sc;
sc->sc_sme->sme_refresh = dstemp_sensors_refresh;
sc->sc_sensor_temp.units = ENVSYS_STEMP;
sc->sc_sensor_temp.state = ENVSYS_SINVALID;
sc->sc_sensor_temp.flags = ENVSYS_FHAS_ENTROPY;
if (prop_dictionary_get_string(sc->sc_prop, "s00", &desc)) {
strncpy(name, desc, 64);
} else if (prop_dictionary_get_string(sc->sc_prop, "saa", &desc)) {
strncpy(name, desc, 64);
}
strncpy(sc->sc_sensor_temp.desc, name, sizeof(sc->sc_sensor_temp.desc));
sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor_temp);
sysmon_envsys_register(sc->sc_sme);
}
static void
dstemp_init(struct dstemp_softc *sc)
{
int error;
uint8_t cmd[2], data;
if (iic_acquire_bus(sc->sc_i2c, 0))
return;
cmd[0] = DSTEMP_CONFIG;
data = 0;
error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
sc->sc_addr, cmd, 1, &data, 1, 0);
/* we don't want to change the POL bit, so preserve it */
cmd[1] = (data & DSTEMP_POL) | DSTEMP_12BIT;
error |= iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, cmd, 2, NULL, 0, 0);
/* ... and start converting */
cmd[0] = DSTEMP_CMD_START;
error |= iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, cmd, 1, NULL, 0, 0);
if (error) aprint_error_dev(sc->sc_dev, "chip initialization failed\n");
iic_release_bus(sc->sc_i2c, 0);
}
static void
dstemp_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
{
struct dstemp_softc *sc = sme->sme_cookie;
uint8_t cmd = DSTEMP_TCURRENT;
uint16_t data = 0;
int error;
error = iic_acquire_bus(sc->sc_i2c, 0);
if (error == 0) {
error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, 1, &data, 2, 0);
iic_release_bus(sc->sc_i2c, 0);
}
if (error) {
edata->state = ENVSYS_SINVALID;
} else {
edata->value_cur =
((uint64_t)(be16toh(data) >> 4) * 62500) +
+ 273150000;
if (edata->value_cur > (273150000 + 120000000)) {
edata->state = ENVSYS_SINVALID;
} else
edata->state = ENVSYS_SVALID;
}
}
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