1 /* $NetBSD: dstemp.c,v 1.4 2018/06/26 06:03:57 thorpej 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 1.4 2018/06/26 06:03:57 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 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 struct device_compatible_entry compat_data[] = { 76 { "ds1631", 0 }, 77 { NULL, 0 } 78 }; 79 80 static int 81 dstemp_match(device_t parent, cfdata_t match, void *aux) 82 { 83 struct i2c_attach_args *ia = aux; 84 int match_result; 85 86 if (iic_use_direct_match(ia, match, compat_data, &match_result)) 87 return match_result; 88 89 if ((ia->ia_addr & 0xf8) == 0x48) 90 return I2C_MATCH_ADDRESS_ONLY; 91 92 return 0; 93 } 94 95 static void 96 dstemp_attach(device_t parent, device_t self, void *aux) 97 { 98 struct dstemp_softc *sc = device_private(self); 99 struct i2c_attach_args *ia = aux; 100 char name[64] = "temperature"; 101 102 sc->sc_dev = self; 103 sc->sc_i2c = ia->ia_tag; 104 sc->sc_addr = ia->ia_addr; 105 106 aprint_naive("\n"); 107 aprint_normal(": DS1361\n"); 108 109 sc->sc_sme = sysmon_envsys_create(); 110 sc->sc_sme->sme_name = device_xname(self); 111 sc->sc_sme->sme_cookie = sc; 112 sc->sc_sme->sme_refresh = dstemp_sensors_refresh; 113 114 sc->sc_sensor_temp.units = ENVSYS_STEMP; 115 sc->sc_sensor_temp.state = ENVSYS_SINVALID; 116 #ifdef HAVE_OF 117 int ch; 118 ch = OF_child(ia->ia_cookie); 119 if (ch != 0) { 120 OF_getprop(ch, "location", name, 64); 121 } 122 #endif 123 strncpy(sc->sc_sensor_temp.desc, name, sizeof(sc->sc_sensor_temp.desc)); 124 125 sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor_temp); 126 127 sysmon_envsys_register(sc->sc_sme); 128 } 129 130 static void 131 dstemp_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 132 { 133 struct dstemp_softc *sc = sme->sme_cookie; 134 uint8_t cmd = DSTEMP_TCURRENT; 135 uint16_t data = 0; 136 int error; 137 138 139 iic_acquire_bus(sc->sc_i2c, 0); 140 error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, 141 sc->sc_addr, &cmd, 1, &data, 2, 0); 142 iic_release_bus(sc->sc_i2c, 0); 143 144 if (error) { 145 edata->state = ENVSYS_SINVALID; 146 } else { 147 edata->value_cur = 148 ((uint64_t)(data>>4) * 62500) + 149 + 273150000; 150 edata->state = ENVSYS_SVALID; 151 } 152 } 153