/* $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;
       }
}

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.