/*      $OpenBSD: qctsens.c,v 1.1 2023/06/27 22:38:46 patrick Exp $     */
/*
 * Copyright (c) 2023 Patrick Wildt <patrick@blueri.se>
 *
 * 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/malloc.h>
#include <sys/device.h>
#include <sys/sensors.h>

#include <machine/intr.h>
#include <machine/bus.h>
#include <machine/fdt.h>

#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_clock.h>
#include <dev/ofw/ofw_misc.h>
#include <dev/ofw/ofw_thermal.h>
#include <dev/ofw/fdt.h>

/* Registers (sensor block) */
#define TSENS_Sn_STATUS(n)      (0xa0 + (4 * (n)))
#define  TSENS_Sn_VALID                 (1 << 21)
#define  TSENS_Sn_TEMP(x)               ((x) & 0xfff)

/* Registers (config block) */
#define TSENS_HW_VER            0x00
#define TSENS_CTRL              0x04
#define  TSENS_CTRL_EN                  (1 << 0)
#define  TSENS_CTRL_Sn_EN(x)            (1 << ((x) + 3))

#define TSENS_NUM_SENSORS       16

struct qctsens_softc {
        struct device           sc_dev;
        bus_space_tag_t         sc_iot;
        bus_space_handle_t      sc_ioh;
        bus_space_handle_t      sc_ioh_conf;

        int                     sc_node;

        struct ksensordev       sc_sensordev;
        struct ksensor          sc_sensor[TSENS_NUM_SENSORS];

        struct thermal_sensor   sc_ts;
};

int     qctsens_match(struct device *, void *, void *);
void    qctsens_attach(struct device *, struct device *, void *);

const struct cfattach   qctsens_ca = {
        sizeof (struct qctsens_softc), qctsens_match, qctsens_attach
};

struct cfdriver qctsens_cd = {
        NULL, "qctsens", DV_DULL
};

void    qctsens_refresh_sensors(void *);
int32_t qctsens_get_temperature(void *, uint32_t *);
void qctsens_attach_sensors(struct qctsens_softc *);

int
qctsens_match(struct device *parent, void *match, void *aux)
{
        struct fdt_attach_args *faa = aux;

        return OF_is_compatible(faa->fa_node, "qcom,tsens-v2");
}

void
qctsens_attach(struct device *parent, struct device *self, void *aux)
{
        struct qctsens_softc *sc = (struct qctsens_softc *)self;
        struct fdt_attach_args *faa = aux;
        uint32_t reg;

        if (faa->fa_nreg < 1) {
                printf(": no registers\n");
                return;
        }

        sc->sc_node = faa->fa_node;
        sc->sc_iot = faa->fa_iot;
        if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
            faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
                printf(": can't map registers (sensors)\n");
                return;
        }
        if (bus_space_map(sc->sc_iot, faa->fa_reg[1].addr,
            faa->fa_reg[1].size, 0, &sc->sc_ioh_conf)) {
                printf(": can't map registers (config)\n");
                return;
        }

        printf("\n");

        reg = bus_space_read_4(sc->sc_iot, sc->sc_ioh_conf, TSENS_CTRL);
        if ((reg & TSENS_CTRL_EN) == 0)
                return;

        qctsens_attach_sensors(sc);

        sc->sc_ts.ts_node = sc->sc_node;
        sc->sc_ts.ts_cookie = sc;
        sc->sc_ts.ts_get_temperature = qctsens_get_temperature;
        thermal_sensor_register(&sc->sc_ts);
}

void
qctsens_attach_sensors(struct qctsens_softc *sc)
{
        char nodename[32];
        uint32_t propdata[4];
        uint32_t phandle, reg;
        int node, len, sidx;

        phandle = OF_getpropint(sc->sc_node, "phandle", 0);
        if (phandle == 0) {
                printf("%s: missing phandle on node\n", sc->sc_dev.dv_xname);
                return;
        }

        reg = bus_space_read_4(sc->sc_iot, sc->sc_ioh_conf, TSENS_CTRL);
        node = OF_getnodebyname(0, "thermal-zones");
        for (node = OF_child(node); node != 0; node = OF_peer(node)) {
                len = OF_getpropintarray(node, "thermal-sensors", propdata,
                    sizeof(propdata));

                if (len != 8 || propdata[0] != phandle || propdata[1] >= 16)
                        continue;

                len = OF_getprop(node, "name", nodename, sizeof(nodename));
                len = strlen(nodename);
                if (strcmp("-thermal", &nodename[len - 8]) != 0)
                        continue;

                nodename[len - 8] = '\0';
                sidx = propdata[1];

                if ((reg & TSENS_CTRL_Sn_EN(sidx)) == 0)
                        continue;

                strlcpy(sc->sc_sensor[sidx].desc, nodename,
                    sizeof(sc->sc_sensor[sidx].desc));
                sc->sc_sensor[sidx].type = SENSOR_TEMP;
                sc->sc_sensor[sidx].flags = SENSOR_FINVALID;
                sensor_attach(&sc->sc_sensordev, &sc->sc_sensor[sidx]);
        }

        strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
            sizeof(sc->sc_sensordev.xname));
        sensordev_install(&sc->sc_sensordev);
        sensor_task_register(sc, qctsens_refresh_sensors, 1);
}

void
qctsens_refresh_sensors(void *arg)
{
        struct qctsens_softc *sc = arg;
        int32_t reg, temp;
        int id;

        for (id = 0; id < TSENS_NUM_SENSORS; id++) {
                if (sc->sc_sensor[id].type != SENSOR_TEMP)
                        continue;
                reg = bus_space_read_4(sc->sc_iot, sc->sc_ioh,
                    TSENS_Sn_STATUS(id));
                temp = TSENS_Sn_TEMP(reg);
                if (reg & TSENS_Sn_VALID) {
                        sc->sc_sensor[id].value = 273150000 + 100000 * temp;
                        sc->sc_sensor[id].flags &= ~SENSOR_FINVALID;
                } else {
                        sc->sc_sensor[id].flags = SENSOR_FINVALID;
                }
        }
}

int32_t
qctsens_get_temperature(void *cookie, uint32_t *cells)
{
        struct qctsens_softc *sc = cookie;
        uint32_t id = cells[0];
        int32_t reg, temp;

        reg = bus_space_read_4(sc->sc_iot, sc->sc_ioh, TSENS_Sn_STATUS(id));
        temp = 273150000 + 100000 * TSENS_Sn_TEMP(reg);

        if (reg & TSENS_Sn_VALID)
                return temp;

        return THERMAL_SENSOR_MAX;
}