1 /* $NetBSD: dstemp.c,v 1.15 2025/09/21 13:54:56 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 1.15 2025/09/21 13:54:56 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 #define DSTEMP_CMD_START 0x51 /* command, no data */ 43 #define DSTEMP_CMD_POR 0x54 /* command, no data */ 44 #define DSTEMP_CMD_STOP 0x22 /* command, no data */ 45 #define DSTEMP_TCURRENT 0xaa /* current temperature, 2 bytes */ 46 #define DSTEMP_THIGH 0xa1 /* high threshold, 2 bytes */ 47 #define DSTEMP_TLOW 0xa2 /* low threshold, 2 bytes */ 48 #define DSTEMP_CONFIG 0xac /* 1 byte */ 49 50 #define DSTEMP_1SHOT 0x01 51 #define DSTEMP_POL 0x02 /* Tout polarity, 1 - active high */ 52 #define DSTEMP_8BIT 0x00 53 #define DSTEMP_10BIT 0x04 54 #define DSTEMP_11BIT 0x08 55 #define DSTEMP_12BIT 0x0c 56 #define DSTEMP_RES_MASK 0x0c 57 #define DSTEMP_NVB 0x10 /* EEPROM busy */ 58 #define DSTEMP_TLF 0x20 /* temperature low flag */ 59 #define DSTEMP_THF 0x40 /* temperature high flag */ 60 #define DSTEMP_DONE 0x80 61 62 struct dstemp_softc { 63 device_t sc_dev; 64 i2c_tag_t sc_i2c; 65 i2c_addr_t sc_addr; 66 struct sysmon_envsys *sc_sme; 67 envsys_data_t sc_sensor_temp; 68 }; 69 70 static int dstemp_match(device_t, cfdata_t, void *); 71 static void dstemp_attach(device_t, device_t, void *); 72 73 static void dstemp_sensors_refresh(struct sysmon_envsys *, envsys_data_t *); 74 static void dstemp_init(struct dstemp_softc *); 75 76 CFATTACH_DECL_NEW(dstemp, sizeof(struct dstemp_softc), 77 dstemp_match, dstemp_attach, NULL, NULL); 78 79 static const struct device_compatible_entry compat_data[] = { 80 { .compat = "dallas,ds1631" }, 81 { .compat = "ds1631" }, 82 DEVICE_COMPAT_EOL 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, 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 const char *desc; 107 prop_dictionary_t props = device_properties(self); 108 109 sc->sc_dev = self; 110 sc->sc_i2c = ia->ia_tag; 111 sc->sc_addr = ia->ia_addr; 112 113 aprint_naive("\n"); 114 aprint_normal(": DS1361\n"); 115 116 dstemp_init(sc); 117 118 sc->sc_sme = sysmon_envsys_create(); 119 sc->sc_sme->sme_name = device_xname(self); 120 sc->sc_sme->sme_cookie = sc; 121 sc->sc_sme->sme_refresh = dstemp_sensors_refresh; 122 123 sc->sc_sensor_temp.units = ENVSYS_STEMP; 124 sc->sc_sensor_temp.state = ENVSYS_SINVALID; 125 sc->sc_sensor_temp.flags = ENVSYS_FHAS_ENTROPY; 126 127 if (prop_dictionary_get_string(props, "s00", &desc)) { 128 strncpy(name, desc, 64); 129 } else if (prop_dictionary_get_string(props, "saa", &desc)) { 130 strncpy(name, desc, 64); 131 } 132 133 strncpy(sc->sc_sensor_temp.desc, name, sizeof(sc->sc_sensor_temp.desc)); 134 135 sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor_temp); 136 137 sysmon_envsys_register(sc->sc_sme); 138 } 139 140 static void 141 dstemp_init(struct dstemp_softc *sc) 142 { 143 int error; 144 uint8_t cmd[2], data; 145 146 if (iic_acquire_bus(sc->sc_i2c, 0)) 147 return; 148 cmd[0] = DSTEMP_CONFIG; 149 data = 0; 150 error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, 151 sc->sc_addr, cmd, 1, &data, 1, 0); 152 /* we don't want to change the POL bit, so preserve it */ 153 cmd[1] = (data & DSTEMP_POL) | DSTEMP_12BIT; 154 error |= iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, 155 sc->sc_addr, cmd, 2, NULL, 0, 0); 156 /* ... and start converting */ 157 cmd[0] = DSTEMP_CMD_START; 158 error |= iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, 159 sc->sc_addr, cmd, 1, NULL, 0, 0); 160 if (error) aprint_error_dev(sc->sc_dev, "chip initialization failed\n"); 161 iic_release_bus(sc->sc_i2c, 0); 162 } 163 164 static void 165 dstemp_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 166 { 167 struct dstemp_softc *sc = sme->sme_cookie; 168 uint8_t cmd = DSTEMP_TCURRENT; 169 uint16_t data = 0; 170 int error; 171 172 173 error = iic_acquire_bus(sc->sc_i2c, 0); 174 if (error == 0) { 175 error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, 176 sc->sc_addr, &cmd, 1, &data, 2, 0); 177 iic_release_bus(sc->sc_i2c, 0); 178 } 179 180 if (error) { 181 edata->state = ENVSYS_SINVALID; 182 } else { 183 edata->value_cur = 184 ((uint64_t)(be16toh(data) >> 4) * 62500) + 185 + 273150000; 186 if (edata->value_cur > (273150000 + 120000000)) { 187 edata->state = ENVSYS_SINVALID; 188 } else 189 edata->state = ENVSYS_SVALID; 190 } 191 } 192
Indexes created Sat Sep 27 14:09:57 GMT 2025