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titemp.c revision 1.9
      1 /* $NetBSD: titemp.c,v 1.9 2021/01/17 21:42:35 thorpej Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: titemp.c,v 1.9 2021/01/17 21:42:35 thorpej Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/systm.h>
     34 #include <sys/device.h>
     35 #include <sys/conf.h>
     36 #include <sys/bus.h>
     37 #include <sys/kmem.h>
     38 
     39 #include <dev/i2c/i2cvar.h>
     40 
     41 #include <dev/sysmon/sysmonvar.h>
     42 
     43 #define TITEMP_LTEMP_HI_REG		0x00
     44 #define TITEMP_RTEMP_HI_REG		0x01
     45 #define TITEMP_STATUS_REG		0x02
     46 #define TITEMP_CONFIG_REG		0x03
     47 #define TITEMP_CONVRATE_REG		0x04
     48 #define TITEMP_LTEMP_HLIMIT_HI_REG	0x05
     49 #define TITEMP_LTEMP_LLIMIT_HI_REG	0x06
     50 #define TITEMP_RTEMP_HLIMIT_HI_REG	0x07
     51 #define TITEMP_RTEMP_LLIMIT_HI_REG	0x08
     52 #define TITEMP_RTEMP_LO_REG		0x10
     53 #define TITEMP_RTEMP_OFF_HI_REG		0x11
     54 #define TITEMP_RTEMP_OFF_LO_REG		0x12
     55 #define TITEMP_RTEMP_HLIMIT_LO_REG	0x13
     56 #define TITEMP_RTEMP_LLIMIT_LO_REG	0x14
     57 #define TITEMP_LTEMP_LO_REG		0x15
     58 #define TITEMP_RTEMP_THERM_LIMIT_REG	0x19
     59 #define TITEMP_LTEMP_THERM_LIMIT_REG	0x20
     60 #define TITEMP_THERM_HYST_REG		0x21
     61 #define TITEMP_CONAL_REG		0x22
     62 #define TITEMP_NC_REG			0x23
     63 #define TITEMP_DF_REG			0x24
     64 #define TITEMP_MFID_REG			0xfe
     65 
     66 #define TITEMP_MFID_TMP451		0x55
     67 
     68 struct titemp_softc {
     69 	device_t	sc_dev;
     70 	i2c_tag_t	sc_i2c;
     71 	i2c_addr_t	sc_addr;
     72 
     73 	struct sysmon_envsys *sc_sme;
     74 	envsys_data_t	sc_sensor_ltemp;
     75 	envsys_data_t	sc_sensor_rtemp;
     76 };
     77 
     78 static int	titemp_match(device_t, cfdata_t, void *);
     79 static void	titemp_attach(device_t, device_t, void *);
     80 
     81 static void	titemp_sensors_refresh(struct sysmon_envsys *, envsys_data_t *);
     82 static int	titemp_read(struct titemp_softc *, uint8_t, uint8_t *);
     83 
     84 CFATTACH_DECL_NEW(titemp, sizeof(struct titemp_softc),
     85     titemp_match, titemp_attach, NULL, NULL);
     86 
     87 static const struct device_compatible_entry compat_data[] = {
     88 	{ .compat = "ti,tmp451" },
     89 
     90 	{ 0 }
     91 };
     92 
     93 static int
     94 titemp_match(device_t parent, cfdata_t match, void *aux)
     95 {
     96 	struct i2c_attach_args *ia = aux;
     97 	uint8_t mfid;
     98 	int error, match_result;
     99 
    100 	if (iic_use_direct_match(ia, match, compat_data, &match_result))
    101 		return match_result;
    102 
    103 	if (ia->ia_addr != 0x4c)
    104 		return 0;
    105 
    106 	if (iic_acquire_bus(ia->ia_tag, 0) != 0)
    107 		return 0;
    108 	error = iic_smbus_read_byte(ia->ia_tag, ia->ia_addr,
    109 	    TITEMP_MFID_REG, &mfid, 0);
    110 	iic_release_bus(ia->ia_tag, 0);
    111 
    112 	if (error || mfid != TITEMP_MFID_TMP451)
    113 		return 0;
    114 
    115 	return I2C_MATCH_ADDRESS_AND_PROBE;
    116 }
    117 
    118 static void
    119 titemp_attach(device_t parent, device_t self, void *aux)
    120 {
    121 	struct titemp_softc *sc = device_private(self);
    122 	struct i2c_attach_args *ia = aux;
    123 
    124 	sc->sc_dev = self;
    125 	sc->sc_i2c = ia->ia_tag;
    126 	sc->sc_addr = ia->ia_addr;
    127 
    128 	aprint_naive("\n");
    129 	aprint_normal(": TMP451\n");
    130 
    131 	sc->sc_sme = sysmon_envsys_create();
    132 	sc->sc_sme->sme_name = device_xname(self);
    133 	sc->sc_sme->sme_cookie = sc;
    134 	sc->sc_sme->sme_refresh = titemp_sensors_refresh;
    135 
    136 	sc->sc_sensor_ltemp.units = ENVSYS_STEMP;
    137 	sc->sc_sensor_ltemp.state = ENVSYS_SINVALID;
    138 	snprintf(sc->sc_sensor_ltemp.desc, sizeof(sc->sc_sensor_ltemp.desc),
    139 	    "local temperature");
    140 	sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor_ltemp);
    141 
    142 	sc->sc_sensor_rtemp.units = ENVSYS_STEMP;
    143 	sc->sc_sensor_rtemp.state = ENVSYS_SINVALID;
    144 	snprintf(sc->sc_sensor_rtemp.desc, sizeof(sc->sc_sensor_rtemp.desc),
    145 	    "remote temperature");
    146 	sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor_rtemp);
    147 
    148 	sysmon_envsys_register(sc->sc_sme);
    149 }
    150 
    151 static void
    152 titemp_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
    153 {
    154 	struct titemp_softc *sc = sme->sme_cookie;
    155 	uint8_t reg_hi, reg_lo, temp[2];
    156 	int error;
    157 
    158 	if (edata == &sc->sc_sensor_ltemp) {
    159 		reg_hi = TITEMP_LTEMP_HI_REG;
    160 		reg_lo = TITEMP_LTEMP_LO_REG;
    161 	} else if (edata == &sc->sc_sensor_rtemp) {
    162 		reg_hi = TITEMP_RTEMP_HI_REG;
    163 		reg_lo = TITEMP_RTEMP_LO_REG;
    164 	} else {
    165 		edata->state = ENVSYS_SINVALID;
    166 		return;
    167 	}
    168 
    169 	iic_acquire_bus(sc->sc_i2c, 0);
    170 	if ((error = titemp_read(sc, reg_hi, &temp[0])) != 0)
    171 		goto done;
    172 	if ((error = titemp_read(sc, reg_lo, &temp[1])) != 0)
    173 		goto done;
    174 done:
    175 	iic_release_bus(sc->sc_i2c, 0);
    176 
    177 	if (error) {
    178 		edata->state = ENVSYS_SINVALID;
    179 	} else {
    180 		edata->value_cur =
    181 		    ((uint64_t)temp[0] * 1000000) +
    182 		    ((uint64_t)(temp[1]>>4) * 62500) +
    183 		    + 273150000;
    184 		edata->state = ENVSYS_SVALID;
    185 	}
    186 }
    187 
    188 static int
    189 titemp_read(struct titemp_softc *sc, uint8_t reg, uint8_t *val)
    190 {
    191 	return iic_smbus_read_byte(sc->sc_i2c, sc->sc_addr, reg, val, 0);
    192 }
    193