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dstemp.c revision 1.1.2.1 
      1 /* $NetBSD: dstemp.c,v 1.1.2.1 2018/06/25 07:25:50 pgoyette Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2018 Michael Lorenz
      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: dstemp.c,v 1.1.2.1 2018/06/25 07:25:50 pgoyette 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 
     38 #include <dev/i2c/i2cvar.h>
     39 
     40 #include <dev/sysmon/sysmonvar.h>
     41 
     42 #ifdef macppc
     43 #define HAVE_OF 1
     44 #endif
     45 
     46 #ifdef HAVE_OF
     47 #include <dev/ofw/openfirm.h>
     48 #endif
     49 
     50 #define DSTEMP_CMD_START	0x51	/* command, no data */
     51 #define DSTEMP_CMD_POR		0x54	/* command, no data */
     52 #define DSTEMP_CMD_STOP		0x22	/* command, no data */
     53 #define DSTEMP_TCURRENT		0xaa	/* current temperature, 2 bytes */
     54 #define DSTEMP_THIGH		0xa1	/* high threshold, 2 bytes */
     55 #define DSTEMP_TLOW		0xa2	/* low threshold, 2 bytes */
     56 #define DSTEMP_CONFIG		0xac	/* 1 byte */
     57 
     58 struct dstemp_softc {
     59 	device_t	sc_dev;
     60 	i2c_tag_t	sc_i2c;
     61 	i2c_addr_t	sc_addr;
     62 
     63 	struct sysmon_envsys *sc_sme;
     64 	envsys_data_t	sc_sensor_temp;
     65 };
     66 
     67 static int	dstemp_match(device_t, cfdata_t, void *);
     68 static void	dstemp_attach(device_t, device_t, void *);
     69 
     70 static void	dstemp_sensors_refresh(struct sysmon_envsys *, envsys_data_t *);
     71 
     72 CFATTACH_DECL_NEW(dstemp, sizeof(struct dstemp_softc),
     73     dstemp_match, dstemp_attach, NULL, NULL);
     74 
     75 static const char * dstemp_compats[] = {
     76 	"ds1631",
     77 	NULL
     78 };
     79 
     80 static const struct device_compatible_entry dstemp_compat_data[] = {
     81 	DEVICE_COMPAT_ENTRY(dstemp_compats),
     82 	DEVICE_COMPAT_TERMINATOR
     83 };
     84 
     85 static int
     86 dstemp_match(device_t parent, cfdata_t match, void *aux)
     87 {
     88 	struct i2c_attach_args *ia = aux;
     89 	int match_result;
     90 
     91 	if (iic_use_direct_match(ia, match, dstemp_compat_data, &match_result))
     92 		return match_result;
     93 
     94 	if ((ia->ia_addr & 0xf8) == 0x48)
     95 		return I2C_MATCH_ADDRESS_ONLY;
     96 
     97 	return 0;
     98 }
     99 
    100 static void
    101 dstemp_attach(device_t parent, device_t self, void *aux)
    102 {
    103 	struct dstemp_softc *sc = device_private(self);
    104 	struct i2c_attach_args *ia = aux;
    105 	char name[64] = "temperature";
    106 
    107 	sc->sc_dev = self;
    108 	sc->sc_i2c = ia->ia_tag;
    109 	sc->sc_addr = ia->ia_addr;
    110 
    111 	aprint_naive("\n");
    112 	aprint_normal(": DS1361\n");
    113 
    114 	sc->sc_sme = sysmon_envsys_create();
    115 	sc->sc_sme->sme_name = device_xname(self);
    116 	sc->sc_sme->sme_cookie = sc;
    117 	sc->sc_sme->sme_refresh = dstemp_sensors_refresh;
    118 
    119 	sc->sc_sensor_temp.units = ENVSYS_STEMP;
    120 	sc->sc_sensor_temp.state = ENVSYS_SINVALID;
    121 #ifdef HAVE_OF
    122 	int ch;
    123 	ch = OF_child(ia->ia_cookie);
    124 	if (ch != 0) {
    125 		OF_getprop(ch, "location", name, 64);
    126 	}
    127 #endif
    128 	strncpy(sc->sc_sensor_temp.desc, name, sizeof(sc->sc_sensor_temp.desc));
    129 
    130 	sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor_temp);
    131 
    132 	sysmon_envsys_register(sc->sc_sme);
    133 }
    134 
    135 static void
    136 dstemp_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
    137 {
    138 	struct dstemp_softc *sc = sme->sme_cookie;
    139 	uint8_t cmd = DSTEMP_TCURRENT;
    140 	uint16_t data = 0;
    141 	int error;
    142 
    143 
    144 	iic_acquire_bus(sc->sc_i2c, 0);
    145 	error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
    146 	    sc->sc_addr, &cmd, 1, &data, 2, 0);
    147 	iic_release_bus(sc->sc_i2c, 0);
    148 
    149 	if (error) {
    150 		edata->state = ENVSYS_SINVALID;
    151 	} else {
    152 		edata->value_cur =
    153 		    ((uint64_t)(data>>4) * 62500) +
    154 		    + 273150000;
    155 		edata->state = ENVSYS_SVALID;
    156 	}
    157 }
    158