/* $NetBSD: psoc.c,v 1.8 2021/06/18 23:00:47 macallan Exp $ */

/*-
* Copyright (c) 2019 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.
*/

/*
* fan controller found in 1GHz TiBook
*
* register values from OF:
* fan1 - 0x20 ( status ), 0x31 ( data )
* fan2 - 0x26 ( status ), 0x45 ( data )
* fan status byte 0:
* 0x5* - fan is running, 0x6* - fan stopped
* byte 1: unknown, 0x80 seems always set, lower bits seem to fluctuate
* byte 2: lower 6 bit seem to indicate speed
* fan speed may be lower 6 bit of byte 2 and lower 6 of byte 1
* temperature sensors start at 6, two bytes each, first appears to be
* the temperature in degrees Celsius
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: psoc.c,v 1.8 2021/06/18 23:00:47 macallan Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <sys/time.h>

#include <dev/ofw/openfirm.h>

#include <dev/i2c/i2cvar.h>

#include <dev/sysmon/sysmonvar.h>

#include "opt_psoc.h"
#ifdef PSOC_DEBUG
#define DPRINTF printf
#else
#define DPRINTF if (0) printf
#endif

struct psoc_softc {
       device_t        sc_dev;
       i2c_tag_t       sc_i2c;
       i2c_addr_t      sc_addr;
       int             sc_node;

       struct sysmon_envsys *sc_sme;
       envsys_data_t   sc_sensors[7];
       int             sc_nsensors;
       uint8_t         sc_temp[16];
       time_t          sc_last;
};

static int      psoc_match(device_t, cfdata_t, void *);
static void     psoc_attach(device_t, device_t, void *);

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

static void     psoc_dump(struct psoc_softc *);

CFATTACH_DECL_NEW(psoc, sizeof(struct psoc_softc),
   psoc_match, psoc_attach, NULL, NULL);

static const struct device_compatible_entry compat_data[] = {
       { .compat = "Psoc" },
       DEVICE_COMPAT_EOL
};

static int
psoc_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;

       return 0;
}

static void
psoc_attach(device_t parent, device_t self, void *aux)
{
       struct psoc_softc *sc = device_private(self);
       struct i2c_attach_args *ia = aux;
       char path[256];
       envsys_data_t *s;
       int error, ih, r, i;

       sc->sc_dev = self;
       sc->sc_i2c = ia->ia_tag;
       sc->sc_addr = ia->ia_addr;
       sc->sc_node = ia->ia_cookie;
       sc->sc_last = 0;

       aprint_naive("\n");
       aprint_normal(": Psoc fan controller\n");

       error = OF_package_to_path(sc->sc_node, path, 256);
       path[error] = 0;
       DPRINTF("path [%s]\n", path);
       ih = OF_open("fan");
       OF_call_method_1("fan-init", ih, 0);
       DPRINTF("ih %08x\n", ih);

       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 = psoc_sensors_refresh;
       sc->sc_nsensors = 0;

       psoc_dump(sc);

       for (i = 0; i < 4; i++) {
               r = i * 2 + 6;
               s = &sc->sc_sensors[sc->sc_nsensors];
               s->state = ENVSYS_SINVALID;
               s->units = ENVSYS_STEMP;
               snprintf(s->desc, 16, "temp%d", i);
               s->private = r;
               sysmon_envsys_sensor_attach(sc->sc_sme, s);
               sc->sc_nsensors++;
       }

       for (r = 0x20; r < 0x2b; r += 0x06) {
               s = &sc->sc_sensors[sc->sc_nsensors];
               s->state = ENVSYS_SINVALID;
               s->units = ENVSYS_SFANRPM;
               snprintf(s->desc, 16, "reg %02x", r);
               s->private = r;
               sysmon_envsys_sensor_attach(sc->sc_sme, s);
               sc->sc_nsensors++;
       }

       sysmon_envsys_register(sc->sc_sme);
}

static void
psoc_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
{
       struct psoc_softc *sc = sme->sme_cookie;
       uint8_t cmd = 6;
       uint8_t buf[0x28];
       int error = 1, data;

       if ( edata->private < 0x20) {
               cmd = 0;
               if ((time_second - sc->sc_last) > 2) {
                       iic_acquire_bus(sc->sc_i2c, 0);
                       error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
                                   sc->sc_addr, &cmd, 1, sc->sc_temp, 16, 0);
                       iic_release_bus(sc->sc_i2c, 0);
                       if (error) return;
                       sc->sc_last = time_second;
               }
               error = 0;
               if (edata->private > 0) {
                       data = sc->sc_temp[edata->private];
                       /* Celsius -> microkelvin */
                       edata->value_cur = ((int)data * 1000000) + 273150000;
               }
#ifdef PSOC_DEBUG
               if (edata->private == 6)
                       psoc_dump(sc);
#endif
       } else {
               cmd = edata->private;
               iic_acquire_bus(sc->sc_i2c, 0);
               error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
                           sc->sc_addr, &cmd, 1, buf, 3, 0);
               iic_release_bus(sc->sc_i2c, 0);
               if (error) return;
               switch (buf[0] & 0xf0) {
                       case 0x50:
                               data = buf[edata->private - 0x20];
                               edata->value_cur = ((buf[2] & 0x3f) << 6) |
                                                   (buf[1] & 0x3f);
                               break;
                       case 0x60:
                               edata->value_cur = 0;
                               break;
                       default:
                               error = 0;
               }
       }
       if (error) {
               edata->state = ENVSYS_SINVALID;
       } else {
               edata->state = ENVSYS_SVALID;
       }
}

static void
psoc_dump(struct psoc_softc *sc)
{
       int i, j;
       uint8_t data, cmd;

       iic_acquire_bus(sc->sc_i2c, 0);
       for (i = 0x20; i < 0x5f; i+= 8) {
               printf("%02x:", i);
               for (j = 0; j < 8; j++) {
                       cmd = i + j;
                       data = 0;
                       iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
                           sc->sc_addr, &cmd, 1, &data, 1, 0);
                       printf(" %02x", data);
               }
               printf("\n");
       }
       iic_release_bus(sc->sc_i2c, 0);
}

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