owtemp.c revision 1.2.2.4
1 1.2.2.4 yamt /* $NetBSD: owtemp.c,v 1.2.2.4 2006/08/11 15:44:25 yamt Exp $ */ 2 1.2.2.2 yamt /* $OpenBSD: owtemp.c,v 1.1 2006/03/04 16:27:03 grange Exp $ */ 3 1.2.2.2 yamt 4 1.2.2.2 yamt /* 5 1.2.2.2 yamt * Copyright (c) 2006 Alexander Yurchenko <grange (at) openbsd.org> 6 1.2.2.2 yamt * 7 1.2.2.2 yamt * Permission to use, copy, modify, and distribute this software for any 8 1.2.2.2 yamt * purpose with or without fee is hereby granted, provided that the above 9 1.2.2.2 yamt * copyright notice and this permission notice appear in all copies. 10 1.2.2.2 yamt * 11 1.2.2.2 yamt * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 1.2.2.2 yamt * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 1.2.2.2 yamt * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 1.2.2.2 yamt * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 1.2.2.2 yamt * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 1.2.2.2 yamt * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 1.2.2.2 yamt * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 1.2.2.2 yamt */ 19 1.2.2.2 yamt 20 1.2.2.2 yamt /* 21 1.2.2.2 yamt * 1-Wire temperature family type device driver. 22 1.2.2.2 yamt */ 23 1.2.2.2 yamt 24 1.2.2.2 yamt #include <sys/cdefs.h> 25 1.2.2.4 yamt __KERNEL_RCSID(0, "$NetBSD: owtemp.c,v 1.2.2.4 2006/08/11 15:44:25 yamt Exp $"); 26 1.2.2.2 yamt 27 1.2.2.2 yamt #include <sys/param.h> 28 1.2.2.2 yamt #include <sys/systm.h> 29 1.2.2.2 yamt #include <sys/device.h> 30 1.2.2.2 yamt #include <sys/kernel.h> 31 1.2.2.2 yamt #include <sys/proc.h> 32 1.2.2.2 yamt 33 1.2.2.2 yamt #include <dev/sysmon/sysmonvar.h> 34 1.2.2.2 yamt 35 1.2.2.2 yamt #include <dev/onewire/onewiredevs.h> 36 1.2.2.2 yamt #include <dev/onewire/onewirereg.h> 37 1.2.2.2 yamt #include <dev/onewire/onewirevar.h> 38 1.2.2.2 yamt 39 1.2.2.2 yamt #define DS_CMD_CONVERT 0x44 40 1.2.2.2 yamt #define DS_CMD_READ_SCRATCHPAD 0xbe 41 1.2.2.2 yamt 42 1.2.2.2 yamt struct owtemp_softc { 43 1.2.2.2 yamt struct device sc_dev; 44 1.2.2.2 yamt 45 1.2.2.2 yamt void * sc_onewire; 46 1.2.2.2 yamt u_int64_t sc_rom; 47 1.2.2.2 yamt 48 1.2.2.2 yamt struct envsys_tre_data sc_sensor[1]; 49 1.2.2.2 yamt struct envsys_basic_info sc_info[1]; 50 1.2.2.2 yamt 51 1.2.2.2 yamt struct sysmon_envsys sc_sysmon; 52 1.2.2.2 yamt 53 1.2.2.2 yamt uint32_t (*sc_owtemp_decode)(const uint8_t *); 54 1.2.2.2 yamt 55 1.2.2.2 yamt int sc_dying; 56 1.2.2.2 yamt }; 57 1.2.2.2 yamt 58 1.2.2.2 yamt int owtemp_match(struct device *, struct cfdata *, void *); 59 1.2.2.2 yamt void owtemp_attach(struct device *, struct device *, void *); 60 1.2.2.2 yamt int owtemp_detach(struct device *, int); 61 1.2.2.2 yamt int owtemp_activate(struct device *, enum devact); 62 1.2.2.2 yamt 63 1.2.2.2 yamt void owtemp_update(void *); 64 1.2.2.2 yamt 65 1.2.2.2 yamt CFATTACH_DECL(owtemp, sizeof(struct owtemp_softc), 66 1.2.2.2 yamt owtemp_match, owtemp_attach, owtemp_detach, owtemp_activate); 67 1.2.2.2 yamt 68 1.2.2.2 yamt extern struct cfdriver owtemp_cd; 69 1.2.2.2 yamt 70 1.2.2.2 yamt static const struct onewire_matchfam owtemp_fams[] = { 71 1.2.2.2 yamt { ONEWIRE_FAMILY_DS1920 }, 72 1.2.2.2 yamt { ONEWIRE_FAMILY_DS18B20 }, 73 1.2.2.2 yamt { ONEWIRE_FAMILY_DS1822 }, 74 1.2.2.2 yamt }; 75 1.2.2.2 yamt 76 1.2.2.2 yamt static const struct envsys_range owtemp_ranges[] = { 77 1.2.2.2 yamt { 0, 1, ENVSYS_STEMP }, 78 1.2.2.2 yamt { 1, 0, -1 }, 79 1.2.2.2 yamt }; 80 1.2.2.2 yamt 81 1.2.2.2 yamt static int owtemp_gtredata(struct sysmon_envsys *, 82 1.2.2.2 yamt struct envsys_tre_data *); 83 1.2.2.2 yamt static int owtemp_streinfo(struct sysmon_envsys *, 84 1.2.2.2 yamt struct envsys_basic_info *); 85 1.2.2.2 yamt 86 1.2.2.2 yamt static uint32_t owtemp_decode_ds18b20(const uint8_t *); 87 1.2.2.2 yamt static uint32_t owtemp_decode_ds1920(const uint8_t *); 88 1.2.2.2 yamt 89 1.2.2.2 yamt int 90 1.2.2.2 yamt owtemp_match(struct device *parent, struct cfdata *cf, void *aux) 91 1.2.2.2 yamt { 92 1.2.2.2 yamt return (onewire_matchbyfam(aux, owtemp_fams, 93 1.2.2.2 yamt sizeof(owtemp_fams) /sizeof(owtemp_fams[0]))); 94 1.2.2.2 yamt } 95 1.2.2.2 yamt 96 1.2.2.2 yamt void 97 1.2.2.2 yamt owtemp_attach(struct device *parent, struct device *self, void *aux) 98 1.2.2.2 yamt { 99 1.2.2.2 yamt struct owtemp_softc *sc = device_private(self); 100 1.2.2.2 yamt struct onewire_attach_args *oa = aux; 101 1.2.2.3 yamt prop_string_t desc; 102 1.2.2.2 yamt 103 1.2.2.2 yamt sc->sc_onewire = oa->oa_onewire; 104 1.2.2.2 yamt sc->sc_rom = oa->oa_rom; 105 1.2.2.2 yamt 106 1.2.2.2 yamt switch(ONEWIRE_ROM_FAMILY_TYPE(sc->sc_rom)) { 107 1.2.2.2 yamt case ONEWIRE_FAMILY_DS18B20: 108 1.2.2.2 yamt case ONEWIRE_FAMILY_DS1822: 109 1.2.2.2 yamt sc->sc_owtemp_decode = owtemp_decode_ds18b20; 110 1.2.2.2 yamt break; 111 1.2.2.2 yamt case ONEWIRE_FAMILY_DS1920: 112 1.2.2.2 yamt sc->sc_owtemp_decode = owtemp_decode_ds1920; 113 1.2.2.2 yamt break; 114 1.2.2.2 yamt } 115 1.2.2.2 yamt 116 1.2.2.2 yamt /* Initialize sensor */ 117 1.2.2.2 yamt sc->sc_sensor[0].sensor = sc->sc_info[0].sensor = 0; 118 1.2.2.2 yamt sc->sc_sensor[0].validflags = ENVSYS_FVALID; 119 1.2.2.2 yamt sc->sc_info[0].validflags = ENVSYS_FVALID; 120 1.2.2.2 yamt sc->sc_sensor[0].warnflags = ENVSYS_WARN_OK; 121 1.2.2.2 yamt 122 1.2.2.2 yamt sc->sc_sensor[0].units = sc->sc_info[0].units = ENVSYS_STEMP; 123 1.2.2.3 yamt desc = prop_dictionary_get(device_properties(&sc->sc_dev), 124 1.2.2.4 yamt "envsys-description"); 125 1.2.2.3 yamt if (desc != NULL && 126 1.2.2.3 yamt prop_object_type(desc) == PROP_TYPE_STRING && 127 1.2.2.3 yamt prop_string_size(desc) > 0) 128 1.2.2.3 yamt strcpy(sc->sc_info[0].desc, prop_string_cstring_nocopy(desc)); 129 1.2.2.3 yamt else 130 1.2.2.2 yamt strcpy(sc->sc_info[0].desc, sc->sc_dev.dv_xname); 131 1.2.2.2 yamt 132 1.2.2.2 yamt /* Hook into system monitor. */ 133 1.2.2.2 yamt sc->sc_sysmon.sme_ranges = owtemp_ranges; 134 1.2.2.2 yamt sc->sc_sysmon.sme_sensor_info = sc->sc_info; 135 1.2.2.2 yamt sc->sc_sysmon.sme_sensor_data = sc->sc_sensor; 136 1.2.2.2 yamt sc->sc_sysmon.sme_cookie = sc; 137 1.2.2.2 yamt 138 1.2.2.2 yamt sc->sc_sysmon.sme_gtredata = owtemp_gtredata; 139 1.2.2.2 yamt sc->sc_sysmon.sme_streinfo = owtemp_streinfo; 140 1.2.2.2 yamt 141 1.2.2.2 yamt sc->sc_sysmon.sme_nsensors = 1; 142 1.2.2.2 yamt sc->sc_sysmon.sme_envsys_version = 1000; 143 1.2.2.2 yamt 144 1.2.2.2 yamt if (sysmon_envsys_register(&sc->sc_sysmon)) 145 1.2.2.2 yamt aprint_error("%s: unable to register with sysmon\n", 146 1.2.2.2 yamt sc->sc_dev.dv_xname); 147 1.2.2.2 yamt 148 1.2.2.2 yamt #if 0 /* Old OpenBSD code */ 149 1.2.2.2 yamt strlcpy(sc->sc_sensor.device, sc->sc_dev.dv_xname, 150 1.2.2.2 yamt sizeof(sc->sc_sensor.device)); 151 1.2.2.2 yamt sc->sc_sensor.type = SENSOR_TEMP; 152 1.2.2.2 yamt strlcpy(sc->sc_sensor.desc, "Temp", sizeof(sc->sc_sensor.desc)); 153 1.2.2.2 yamt 154 1.2.2.2 yamt if (sensor_task_register(sc, owtemp_update, 5)) { 155 1.2.2.2 yamt printf(": unable to register update task\n"); 156 1.2.2.2 yamt return; 157 1.2.2.2 yamt } 158 1.2.2.2 yamt sensor_add(&sc->sc_sensor); 159 1.2.2.2 yamt #endif 160 1.2.2.2 yamt 161 1.2.2.2 yamt printf("\n"); 162 1.2.2.2 yamt } 163 1.2.2.2 yamt 164 1.2.2.2 yamt int 165 1.2.2.2 yamt owtemp_detach(struct device *self, int flags) 166 1.2.2.2 yamt { 167 1.2.2.2 yamt struct owtemp_softc *sc = device_private(self); 168 1.2.2.2 yamt 169 1.2.2.2 yamt sysmon_envsys_unregister(&sc->sc_sysmon); 170 1.2.2.2 yamt 171 1.2.2.2 yamt return 0; 172 1.2.2.2 yamt } 173 1.2.2.2 yamt 174 1.2.2.2 yamt int 175 1.2.2.2 yamt owtemp_activate(struct device *self, enum devact act) 176 1.2.2.2 yamt { 177 1.2.2.2 yamt struct owtemp_softc *sc = device_private(self); 178 1.2.2.2 yamt 179 1.2.2.2 yamt switch (act) { 180 1.2.2.2 yamt case DVACT_ACTIVATE: 181 1.2.2.2 yamt return (EOPNOTSUPP); 182 1.2.2.2 yamt case DVACT_DEACTIVATE: 183 1.2.2.2 yamt sc->sc_dying = 1; 184 1.2.2.2 yamt break; 185 1.2.2.2 yamt } 186 1.2.2.2 yamt 187 1.2.2.2 yamt return (0); 188 1.2.2.2 yamt } 189 1.2.2.2 yamt 190 1.2.2.2 yamt void 191 1.2.2.2 yamt owtemp_update(void *arg) 192 1.2.2.2 yamt { 193 1.2.2.2 yamt struct owtemp_softc *sc = arg; 194 1.2.2.2 yamt u_int8_t data[9]; 195 1.2.2.2 yamt 196 1.2.2.2 yamt onewire_lock(sc->sc_onewire, 0); 197 1.2.2.2 yamt if (onewire_reset(sc->sc_onewire) != 0) 198 1.2.2.2 yamt goto done; 199 1.2.2.2 yamt onewire_matchrom(sc->sc_onewire, sc->sc_rom); 200 1.2.2.2 yamt 201 1.2.2.2 yamt /* 202 1.2.2.2 yamt * Start temperature conversion. The conversion takes up to 750ms. 203 1.2.2.2 yamt * After sending the command, the data line must be held high for 204 1.2.2.2 yamt * at least 750ms to provide power during the conversion process. 205 1.2.2.2 yamt * As such, no other activity may take place on the 1-Wire bus for 206 1.2.2.2 yamt * at least this period. 207 1.2.2.2 yamt */ 208 1.2.2.2 yamt onewire_write_byte(sc->sc_onewire, DS_CMD_CONVERT); 209 1.2.2.2 yamt tsleep(sc, PRIBIO, "owtemp", hz); 210 1.2.2.2 yamt 211 1.2.2.2 yamt if (onewire_reset(sc->sc_onewire) != 0) 212 1.2.2.2 yamt goto done; 213 1.2.2.2 yamt onewire_matchrom(sc->sc_onewire, sc->sc_rom); 214 1.2.2.2 yamt 215 1.2.2.2 yamt /* 216 1.2.2.2 yamt * The result of the temperature measurement is placed in the 217 1.2.2.2 yamt * first two bytes of the scratchpad. 218 1.2.2.2 yamt */ 219 1.2.2.2 yamt onewire_write_byte(sc->sc_onewire, DS_CMD_READ_SCRATCHPAD); 220 1.2.2.2 yamt onewire_read_block(sc->sc_onewire, data, 9); 221 1.2.2.2 yamt #if 0 222 1.2.2.2 yamt if (onewire_crc(data, 8) == data[8]) { 223 1.2.2.2 yamt sc->sc_sensor.value = 273150000 + 224 1.2.2.2 yamt (int)((u_int16_t)data[1] << 8 | data[0]) * 500000; 225 1.2.2.2 yamt } 226 1.2.2.2 yamt #endif 227 1.2.2.2 yamt 228 1.2.2.2 yamt sc->sc_sensor[0].cur.data_us = sc->sc_owtemp_decode(data); 229 1.2.2.2 yamt sc->sc_sensor[0].validflags |= ENVSYS_FCURVALID; 230 1.2.2.2 yamt 231 1.2.2.2 yamt done: 232 1.2.2.2 yamt onewire_unlock(sc->sc_onewire); 233 1.2.2.2 yamt } 234 1.2.2.2 yamt 235 1.2.2.2 yamt static int 236 1.2.2.2 yamt owtemp_gtredata(struct sysmon_envsys *sme, struct envsys_tre_data *tred) 237 1.2.2.2 yamt { 238 1.2.2.2 yamt struct owtemp_softc *sc = sme->sme_cookie; 239 1.2.2.2 yamt 240 1.2.2.2 yamt owtemp_update(sc); 241 1.2.2.2 yamt *tred = sc->sc_sensor[tred->sensor]; 242 1.2.2.2 yamt 243 1.2.2.2 yamt return 0; 244 1.2.2.2 yamt } 245 1.2.2.2 yamt 246 1.2.2.2 yamt static int 247 1.2.2.2 yamt owtemp_streinfo(struct sysmon_envsys *sme, struct envsys_basic_info *binfo) 248 1.2.2.2 yamt { 249 1.2.2.2 yamt struct owtemp_softc *sc = sme->sme_cookie; 250 1.2.2.2 yamt 251 1.2.2.2 yamt onewire_lock(sc->sc_onewire,0); /* Also locks our instance */ 252 1.2.2.2 yamt 253 1.2.2.2 yamt memcpy(sc->sc_info[binfo->sensor].desc, binfo->desc, 254 1.2.2.2 yamt sizeof(sc->sc_info[binfo->sensor].desc)); 255 1.2.2.2 yamt sc->sc_info[binfo->sensor].desc[ 256 1.2.2.2 yamt sizeof(sc->sc_info[binfo->sensor].desc) - 1] = '\0'; 257 1.2.2.2 yamt 258 1.2.2.2 yamt onewire_unlock(sc->sc_onewire); 259 1.2.2.2 yamt 260 1.2.2.2 yamt binfo->validflags = ENVSYS_FVALID; 261 1.2.2.2 yamt 262 1.2.2.2 yamt return 0; 263 1.2.2.2 yamt } 264 1.2.2.2 yamt 265 1.2.2.2 yamt static uint32_t 266 1.2.2.2 yamt owtemp_decode_ds18b20(const uint8_t *buf) 267 1.2.2.2 yamt { 268 1.2.2.2 yamt int temp; 269 1.2.2.2 yamt 270 1.2.2.2 yamt /* 271 1.2.2.2 yamt * Sign-extend the MSB byte, and add in the fractions of a 272 1.2.2.2 yamt * degree contained in the LSB (precision 1/16th DegC). 273 1.2.2.2 yamt */ 274 1.2.2.2 yamt temp = (int8_t)buf[1]; 275 1.2.2.2 yamt temp = (temp << 8) | buf[0]; 276 1.2.2.2 yamt 277 1.2.2.2 yamt /* 278 1.2.2.2 yamt * Conversion to uK is simple. 279 1.2.2.2 yamt */ 280 1.2.2.2 yamt return (temp * 62500 + 273150000); 281 1.2.2.2 yamt } 282 1.2.2.2 yamt 283 1.2.2.2 yamt static uint32_t 284 1.2.2.2 yamt owtemp_decode_ds1920(const uint8_t *buf) 285 1.2.2.2 yamt { 286 1.2.2.2 yamt int temp; 287 1.2.2.2 yamt 288 1.2.2.2 yamt /* 289 1.2.2.2 yamt * Sign-extend the MSB byte, and add in the fractions of a 290 1.2.2.2 yamt * degree contained in the LSB (precision 1/2 DegC). 291 1.2.2.2 yamt */ 292 1.2.2.2 yamt temp = (int8_t)buf[1]; 293 1.2.2.2 yamt temp = (temp << 8) | buf[0]; 294 1.2.2.2 yamt 295 1.2.2.2 yamt /* Convert to uK */ 296 1.2.2.2 yamt return (temp * 500000 + 273150000); 297 1.2.2.2 yamt } 298
Indexes created Wed Oct 22 13:09:56 GMT 2025