/* $NetBSD: tmp121.c,v 1.12 2025/09/13 14:10:44 thorpej Exp $ */

/*-
 * Copyright (c) 2006 Urbana-Champaign Independent Media Center.
 * Copyright (c) 2006 Garrett D'Amore.
 * All rights reserved.
 *
 * Portions of this code were written by Garrett D'Amore for the
 * Champaign-Urbana Community Wireless Network Project.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgements:
 *      This product includes software developed by the Urbana-Champaign
 *      Independent Media Center.
 *      This product includes software developed by Garrett D'Amore.
 * 4. Urbana-Champaign Independent Media Center's name and Garrett
 *    D'Amore's name may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE URBANA-CHAMPAIGN INDEPENDENT
 * MEDIA CENTER AND GARRETT D'AMORE ``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 URBANA-CHAMPAIGN INDEPENDENT
 * MEDIA CENTER OR GARRETT D'AMORE 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: tmp121.c,v 1.12 2025/09/13 14:10:44 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>

#include <dev/sysmon/sysmonvar.h>

#include <dev/spi/spivar.h>

struct tmp121temp_softc {
        spi_handle_t sc_sh;
        
        struct sysmon_envsys *sc_sme;
        envsys_data_t sc_sensor;
};

static int      tmp121temp_match(device_t, cfdata_t, void *);
static void     tmp121temp_attach(device_t, device_t, void *);

static void     tmp121temp_refresh(struct sysmon_envsys *, envsys_data_t *);

CFATTACH_DECL_NEW(tmp121temp, sizeof(struct tmp121temp_softc),
    tmp121temp_match, tmp121temp_attach, NULL, NULL);

static const struct device_compatible_entry compat_data[] = {
        { .compat = "ti,tmp121" },
        { .compat = "TMP00121" },

#if 0   /* We should also add support for these: */
        { .compat = "ti,tmp122" },

        { .compat = "ti,lm70" },
        { .compat = "LM000070" },

        { .compat = "ti,lm71" },
        { .compat = "LM000071" },

        { .compat = "ti,lm74" },
        { .compat = "LM000074" },
#endif
        DEVICE_COMPAT_EOL
};

static int
tmp121temp_match(device_t parent, cfdata_t cf, void *aux)
{
        struct spi_attach_args *sa = aux;
        int match_result;

        if (spi_use_direct_match(sa, compat_data, &match_result)) {
                return match_result;
        }

        return SPI_MATCH_DEFAULT;
}

static void
tmp121temp_attach(device_t parent, device_t self, void *aux)
{
        struct tmp121temp_softc *sc = device_private(self);
        struct spi_attach_args *sa = aux;
        int error;

        aprint_naive(": Temperature Sensor\n"); 
        aprint_normal(": TI TMP121 Temperature Sensor\n");

        /* configure for 10MHz */
        error = spi_configure(self, sa->sa_handle, SPI_MODE_0,
            SPI_FREQ_MHz(10));
        if (error) {
                return;
        }

        sc->sc_sh = sa->sa_handle;

        sc->sc_sme = sysmon_envsys_create();
        sc->sc_sensor.units = ENVSYS_STEMP;
        sc->sc_sensor.state = ENVSYS_SINVALID;
        strlcpy(sc->sc_sensor.desc, device_xname(self),
            sizeof(sc->sc_sensor.desc));
        if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor)) {
                sysmon_envsys_destroy(sc->sc_sme);
                return;
        }

        sc->sc_sme->sme_name = device_xname(self);
        sc->sc_sme->sme_refresh = tmp121temp_refresh;
        sc->sc_sme->sme_cookie = sc;

        if (sysmon_envsys_register(sc->sc_sme)) {
                aprint_error_dev(self, "unable to register with sysmon\n");
                sysmon_envsys_destroy(sc->sc_sme);
        }
}

static void
tmp121temp_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
{
        struct tmp121temp_softc *sc = sme->sme_cookie;
        uint16_t                reg;
        int16_t                 sreg;
        int                     val;

        if (spi_recv(sc->sc_sh, 2, (uint8_t *)&reg) != 0) {
                edata->state = ENVSYS_SINVALID;
                return;
        }

        sreg = (int16_t)be16toh(reg);

        /*
         * convert to uK:
         *
         * TMP121 bits:
         * D15          : sign bit
         * D14-D3       : data (D14 is MSB)
         * D2-D0        : zero
         *
         * The data is represented in units of 0.0625 deg C.
         */
        sreg >>= 3;
        val = sreg * 62500 + 273150000;

        edata->value_cur = val;
        edata->state = ENVSYS_SVALID;
}