/* $NetBSD: smscmon.c,v 1.3 2018/06/16 21:22:13 thorpej Exp $ */

/*
* Copyright (c) 2009 Takahiro Hayashi
* 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: smscmon.c,v 1.3 2018/06/16 21:22:13 thorpej Exp $");

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

#include <dev/i2c/i2cvar.h>
#include <dev/sysmon/sysmonvar.h>
#include <dev/i2c/smscmonvar.h>

/*
* A driver for SMSC LPC47M192 hardware monitor at SMBus.
* This driver supports 8 Voltage and 3 Temperature sensors.
* Fan RPM monitoring is not supported in this driver because
* they are seen on ISA bus.
*
* Datasheet available (as of Feb. 20, 2010) at
* http://pdf1.alldatasheet.com/datasheet-pdf/view/109752/SMSC/LPC47M192-NC.html
*/

static int smscmon_match(device_t, cfdata_t, void *);
static void smscmon_attach(device_t, device_t, void *);
static uint8_t smscmon_readreg(struct smscmon_sc *, int);
static void smscmon_writereg(struct smscmon_sc *, int, int);
static void smscmon_sensors_setup(struct smscmon_sc *, struct smscmon_sensor *);
static void smscmon_refresh_volt(struct smscmon_sc *, envsys_data_t *);
static void smscmon_refresh_temp(struct smscmon_sc *, envsys_data_t *);
static void smscmon_refresh(struct sysmon_envsys *, envsys_data_t *);

CFATTACH_DECL_NEW(smscmon, sizeof(struct smscmon_sc),
   smscmon_match, smscmon_attach, NULL, NULL);

static struct smscmon_sensor smscmon_lpc47m192[] = {
       {
               .desc = "+2.5V",
               .type = ENVSYS_SVOLTS_DC,
               .reg = 0x20,
               .refresh = smscmon_refresh_volt,
               .vmin =   13000,
               .vmax = 3320000
       },
       {
               .desc = "Vccp",
               .type = ENVSYS_SVOLTS_DC,
               .reg = 0x21,
               .refresh = smscmon_refresh_volt,
               .vmin =   12000,
               .vmax = 2988000
       },
       {
               .desc = "+3.3V",
               .type = ENVSYS_SVOLTS_DC,
               .reg = 0x22,
               .refresh = smscmon_refresh_volt,
               .vmin =   17000,
               .vmax = 4383000
       },
       {
               .desc = "+5V",
               .type = ENVSYS_SVOLTS_DC,
               .reg = 0x23,
               .refresh = smscmon_refresh_volt,
               .vmin =   26000,
               .vmax = 6640000
       },
       {
               .desc = "+12V",
               .type = ENVSYS_SVOLTS_DC,
               .reg = 0x24,
               .refresh = smscmon_refresh_volt,
               .vmin =    62000,
               .vmax = 15938000
       },
       {
               .desc = "Vcc",
               .type = ENVSYS_SVOLTS_DC,
               .reg = 0x25,
               .refresh = smscmon_refresh_volt,
               .vmin =   17000,
               .vmax = 4383000
       },
       {
               .desc = "+1.5V",
               .type = ENVSYS_SVOLTS_DC,
               .reg = 0x50,
               .refresh = smscmon_refresh_volt,
               .vmin =    8000,
               .vmax = 1992000
       },
       {
               .desc = "+1.8V",
               .type = ENVSYS_SVOLTS_DC,
               .reg = 0x51,
               .refresh = smscmon_refresh_volt,
               .vmin =    9000,
               .vmax = 2391000
       },
       {
               .desc = "Remote Temp1",
               .type = ENVSYS_STEMP,
               .reg = 0x26,
               .refresh = smscmon_refresh_temp,
               .vmin = 0,
               .vmax = 0
       },
       {
               .desc = "Ambient Temp",
               .type = ENVSYS_STEMP,
               .reg = 0x27,
               .refresh = smscmon_refresh_temp,
               .vmin = 0,
               .vmax = 0
       },
       {
               .desc = "Remote Temp2",
               .type = ENVSYS_STEMP,
               .reg = 0x52,
               .refresh = smscmon_refresh_temp,
               .vmax = 0,
               .vmin = 0
       },

       { .desc = NULL }
};

static int
smscmon_match(device_t parent, cfdata_t match, void *aux)
{
       struct i2c_attach_args *ia = aux;
       uint8_t cmd, cid, rev;

       /* Address is hardwired to 010_110x */
       if ((ia->ia_addr & SMSCMON_ADDR_MASK) != SMSCMON_ADDR)
               return 0;

       iic_acquire_bus(ia->ia_tag, 0);

       cmd = SMSCMON_REG_COMPANY;
       if (iic_exec(ia->ia_tag, I2C_OP_READ_WITH_STOP,
           ia->ia_addr, &cmd, sizeof cmd, &cid, sizeof cid, 0)) {
               iic_release_bus(ia->ia_tag, 0);
               return 0;
       }
       cmd = SMSCMON_REG_STEPPING;
       if (iic_exec(ia->ia_tag, I2C_OP_READ_WITH_STOP,
           ia->ia_addr, &cmd, sizeof cmd, &rev, sizeof rev, 0)) {
               iic_release_bus(ia->ia_tag, 0);
               return 0;
       }

       if ( cid != SMSC_CID_47M192 || rev != SMSC_REV_47M192) {
               iic_release_bus(ia->ia_tag, 0);
               return 0;
       }

       iic_release_bus(ia->ia_tag, 0);
       return I2C_MATCH_ADDRESS_AND_PROBE;
}

static void
smscmon_attach(device_t parent, device_t self, void *aux)
{
       struct smscmon_sc *sc = device_private(self);
       struct i2c_attach_args *ia = aux;
       uint8_t cid, rev;
       int i;

       sc->sc_dev = self;
       sc->sc_tag = ia->ia_tag;
       sc->sc_addr = ia->ia_addr;
       sc->smscmon_readreg = smscmon_readreg;
       sc->smscmon_writereg = smscmon_writereg;
       sc->smscmon_sensors = NULL;

       cid = sc->smscmon_readreg(sc, SMSCMON_REG_COMPANY);
       rev = sc->smscmon_readreg(sc, SMSCMON_REG_STEPPING);
       switch (cid) {
       case SMSC_CID_47M192:
               if (rev == SMSC_REV_47M192) {
                       smscmon_sensors_setup(sc, smscmon_lpc47m192);
                       aprint_normal(": LPC47M192 hardware monitor\n");
               }
               break;
       default:
               /* unknown chip */
               break;
       }

       if (sc->smscmon_sensors == NULL) {
               aprint_normal(": unknown chip: cid 0x%02x rev 0x%02x\n",
                   cid, rev);
               return;
       }

       if ((sc->sc_sme = sysmon_envsys_create()) == NULL) {
               aprint_error_dev(sc->sc_dev,
                   "unable to create sysmon structure\n");
               return;
       }

       for (i = 0; i < sc->numsensors; i++) {
               if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sensors[i])) {
                       aprint_error_dev(sc->sc_dev,
                           "unable to attach sensor\n");
                       sysmon_envsys_destroy(sc->sc_sme);
                       return;
               }
       }

       sc->sc_sme->sme_name = device_xname(sc->sc_dev);
       sc->sc_sme->sme_cookie = sc;
       sc->sc_sme->sme_refresh = smscmon_refresh;
       if (sysmon_envsys_register(sc->sc_sme)) {
               aprint_error_dev(sc->sc_dev,
                   "unable to register with sysmon\n");
               sysmon_envsys_destroy(sc->sc_sme);
               return;
       }
}

static uint8_t
smscmon_readreg(struct smscmon_sc *sc, int reg)
{
       uint8_t cmd, data;

       iic_acquire_bus(sc->sc_tag, 0);

       cmd = reg;
       iic_smbus_read_byte(sc->sc_tag, sc->sc_addr, cmd, &data, 0);

       iic_release_bus(sc->sc_tag, 0);

       return data;
}

static void
smscmon_writereg(struct smscmon_sc *sc, int reg, int val)
{
       uint8_t cmd, data;

       iic_acquire_bus(sc->sc_tag, 0);

       cmd = reg;
       data = val;
       iic_smbus_write_byte(sc->sc_tag, sc->sc_addr, cmd, data, 0);

       iic_release_bus(sc->sc_tag, 0);
}

static void
smscmon_sensors_setup(struct smscmon_sc *sc, struct smscmon_sensor *sens)
{
       int i;

       for (i = 0; sens[i].desc; i++) {
               strlcpy(sc->sensors[i].desc, sens[i].desc,
                   sizeof(sc->sensors[i].desc));
               sc->sensors[i].units = sens[i].type;
               sc->sensors[i].state = ENVSYS_SINVALID;
               sc->numsensors++;
       }
       sc->smscmon_sensors = sens;
}

static void
smscmon_refresh_volt(struct smscmon_sc *sc, envsys_data_t *edata)
{
       struct smscmon_sensor *sens = &sc->smscmon_sensors[edata->sensor];
       int data;

       data = (*sc->smscmon_readreg)(sc, sens->reg);
       if (data == 0xff) {
               edata->state = ENVSYS_SINVALID;
       } else {
               edata->value_cur =
                   (sens->vmax - sens->vmin)/255 * data + sens->vmin;
               edata->state = ENVSYS_SVALID;
       }
}

static void
smscmon_refresh_temp(struct smscmon_sc *sc, envsys_data_t *edata)
{
       struct smscmon_sensor *sens = &sc->smscmon_sensors[edata->sensor];
       int data;

       data = (*sc->smscmon_readreg)(sc, sens->reg);
       if (data == 0xff) {
               edata->state = ENVSYS_SINVALID;
       } else {
               /* convert data(degC) to uK */
               edata->value_cur = 273150000 + 1000000 * data;
               edata->state = ENVSYS_SVALID;
       }
}

static void
smscmon_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
{
       struct smscmon_sc *sc = sme->sme_cookie;

       sc->smscmon_sensors[edata->sensor].refresh(sc, edata);
}

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