lm75.c revision 1.41
1 /* $NetBSD: lm75.c,v 1.41 2021/02/06 05:21:47 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 2003 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: lm75.c,v 1.41 2021/02/06 05:21:47 thorpej Exp $"); 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/device.h> 44 #include <sys/kernel.h> 45 #include <sys/sysctl.h> 46 47 #include <dev/sysmon/sysmonvar.h> 48 49 #include <dev/i2c/i2cvar.h> 50 #include <dev/i2c/lm75reg.h> 51 52 struct lmtemp_softc { 53 device_t sc_dev; 54 i2c_tag_t sc_tag; 55 int sc_address; 56 prop_dictionary_t sc_prop; 57 58 struct sysmon_envsys *sc_sme; 59 envsys_data_t sc_sensor; 60 int sc_tmax; 61 uint32_t sc_smax, sc_smin, sc_scrit; 62 63 uint32_t (*sc_lmtemp_decode)(const uint8_t *, int); 64 void (*sc_lmtemp_encode)(const uint32_t, uint8_t *, int); 65 }; 66 67 static int lmtemp_match(device_t, cfdata_t, void *); 68 static void lmtemp_attach(device_t, device_t, void *); 69 70 CFATTACH_DECL_NEW(lmtemp, sizeof(struct lmtemp_softc), 71 lmtemp_match, lmtemp_attach, NULL, NULL); 72 73 static void lmtemp_refresh(struct sysmon_envsys *, envsys_data_t *); 74 static int lmtemp_config_write(struct lmtemp_softc *, uint8_t); 75 static int lmtemp_temp_write(struct lmtemp_softc *, uint8_t, uint32_t, 76 int); 77 static int lmtemp_temp_read(struct lmtemp_softc *, uint8_t, uint32_t *, 78 int); 79 static uint32_t lmtemp_decode_lm75(const uint8_t *, int); 80 static uint32_t lmtemp_decode_ds75(const uint8_t *, int); 81 static uint32_t lmtemp_decode_lm77(const uint8_t *, int); 82 static void lmtemp_encode_lm75(const uint32_t, uint8_t *, int); 83 static void lmtemp_encode_ds75(const uint32_t, uint8_t *, int); 84 static void lmtemp_encode_lm77(const uint32_t, uint8_t *, int); 85 static void lmtemp_getlim_lm75(struct sysmon_envsys *, envsys_data_t *, 86 sysmon_envsys_lim_t *, uint32_t *); 87 static void lmtemp_getlim_lm77(struct sysmon_envsys *, envsys_data_t *, 88 sysmon_envsys_lim_t *, uint32_t *); 89 static void lmtemp_setlim_lm75(struct sysmon_envsys *, envsys_data_t *, 90 sysmon_envsys_lim_t *, uint32_t *); 91 static void lmtemp_setlim_lm77(struct sysmon_envsys *, envsys_data_t *, 92 sysmon_envsys_lim_t *, uint32_t *); 93 94 static void lmtemp_setup_sysctl(struct lmtemp_softc *); 95 static int sysctl_lm75_temp(SYSCTLFN_ARGS); 96 97 enum { 98 lmtemp_lm75 = 0, 99 lmtemp_ds75 = 1, 100 lmtemp_lm77 = 2, 101 }; 102 103 static const struct device_compatible_entry compat_data[] = { 104 { .compat = "national,lm75", .value = lmtemp_lm75 }, 105 { .compat = "i2c-lm75", .value = lmtemp_lm75 }, 106 { .compat = "lm75", .value = lmtemp_lm75 }, 107 108 /* XXX Linux treats ds1775 and ds75 differently. */ 109 { .compat = "dallas,ds1775", .value = lmtemp_ds75 }, 110 { .compat = "ds1775", .value = lmtemp_ds75 }, 111 112 { .compat = "national,lm77", .value = lmtemp_lm77 }, 113 114 /* 115 * see XXX in _attach() below: add code once non-lm75 matches are 116 * added here! 117 */ 118 DEVICE_COMPAT_EOL 119 }; 120 121 static const struct { 122 const char *lmtemp_name; 123 int lmtemp_addrmask; 124 int lmtemp_addr; 125 uint32_t (*lmtemp_decode)(const uint8_t *, int); 126 void (*lmtemp_encode)(const uint32_t, uint8_t *, int); 127 void (*lmtemp_getlim)(struct sysmon_envsys *, envsys_data_t *, 128 sysmon_envsys_lim_t *, uint32_t *); 129 void (*lmtemp_setlim)(struct sysmon_envsys *, envsys_data_t *, 130 sysmon_envsys_lim_t *, uint32_t *); 131 } lmtemptbl[] = { 132 [lmtemp_lm75] = 133 { 134 .lmtemp_name = "LM75", 135 .lmtemp_addrmask = LM75_ADDRMASK, 136 .lmtemp_addr = LM75_ADDR, 137 .lmtemp_decode = lmtemp_decode_lm75, 138 .lmtemp_encode = lmtemp_encode_lm75, 139 .lmtemp_getlim = lmtemp_getlim_lm75, 140 .lmtemp_setlim = lmtemp_setlim_lm75, 141 }, 142 [lmtemp_ds75] = 143 { 144 .lmtemp_name = "DS75", 145 .lmtemp_addrmask = LM75_ADDRMASK, 146 .lmtemp_addr = LM75_ADDR, 147 .lmtemp_decode = lmtemp_decode_ds75, 148 .lmtemp_encode = lmtemp_encode_ds75, 149 .lmtemp_getlim = lmtemp_getlim_lm75, 150 .lmtemp_setlim = lmtemp_setlim_lm75, 151 }, 152 [lmtemp_lm77] = 153 { 154 .lmtemp_name = "LM77", 155 .lmtemp_addrmask = LM77_ADDRMASK, 156 .lmtemp_addr = LM77_ADDR, 157 .lmtemp_decode = lmtemp_decode_lm77, 158 .lmtemp_encode = lmtemp_encode_lm77, 159 .lmtemp_getlim = lmtemp_getlim_lm77, 160 .lmtemp_setlim = lmtemp_setlim_lm77, 161 }, 162 }; 163 164 static int 165 lmtemp_match(device_t parent, cfdata_t cf, void *aux) 166 { 167 struct i2c_attach_args *ia = aux; 168 int i, match_result; 169 170 if (iic_use_direct_match(ia, cf, compat_data, &match_result)) 171 return match_result; 172 173 /* 174 * Indirect config - not much we can do! 175 */ 176 for (i = 0; i < __arraycount(lmtemptbl); i++) { 177 if (i == cf->cf_flags) { 178 break; 179 } 180 } 181 if (i == __arraycount(lmtemptbl)) { 182 return 0; 183 } 184 185 if ((ia->ia_addr & lmtemptbl[i].lmtemp_addrmask) == 186 lmtemptbl[i].lmtemp_addr) 187 return I2C_MATCH_ADDRESS_ONLY; 188 189 return 0; 190 } 191 192 static void 193 lmtemp_attach(device_t parent, device_t self, void *aux) 194 { 195 struct lmtemp_softc *sc = device_private(self); 196 struct i2c_attach_args *ia = aux; 197 const struct device_compatible_entry *dce; 198 char name[64]; 199 const char *desc; 200 int i; 201 202 sc->sc_dev = self; 203 dce = iic_compatible_lookup(ia, compat_data); 204 if (dce != NULL) { 205 i = (int)dce->value; 206 } else { 207 for (i = 0; i < __arraycount(lmtemptbl); i++) { 208 if (i == device_cfdata(self)->cf_flags) { 209 break; 210 } 211 } 212 KASSERT(i < __arraycount(lmtemptbl)); 213 } 214 215 sc->sc_tag = ia->ia_tag; 216 sc->sc_address = ia->ia_addr; 217 sc->sc_prop = ia->ia_prop; 218 prop_object_retain(sc->sc_prop); 219 220 aprint_naive(": Temperature Sensor\n"); 221 if (ia->ia_name) { 222 aprint_normal(": %s %s Temperature Sensor\n", ia->ia_name, 223 lmtemptbl[i].lmtemp_name); 224 } else { 225 aprint_normal(": %s Temperature Sensor\n", 226 lmtemptbl[i].lmtemp_name); 227 } 228 229 sc->sc_lmtemp_decode = lmtemptbl[i].lmtemp_decode; 230 sc->sc_lmtemp_encode = lmtemptbl[i].lmtemp_encode; 231 232 iic_acquire_bus(sc->sc_tag, 0); 233 234 /* Read temperature limit(s) and remember initial value(s). */ 235 if (i == lmtemp_lm77) { 236 if (lmtemp_temp_read(sc, LM77_REG_TCRIT_SET_POINT, 237 &sc->sc_scrit, 1) != 0) { 238 aprint_error_dev(self, 239 "unable to read low register\n"); 240 iic_release_bus(sc->sc_tag, 0); 241 return; 242 } 243 if (lmtemp_temp_read(sc, LM77_REG_TLOW_SET_POINT, 244 &sc->sc_smin, 1) != 0) { 245 aprint_error_dev(self, 246 "unable to read low register\n"); 247 iic_release_bus(sc->sc_tag, 0); 248 return; 249 } 250 if (lmtemp_temp_read(sc, LM77_REG_THIGH_SET_POINT, 251 &sc->sc_smax, 1) != 0) { 252 aprint_error_dev(self, 253 "unable to read high register\n"); 254 iic_release_bus(sc->sc_tag, 0); 255 return; 256 } 257 } else { /* LM75 or compatible */ 258 if (lmtemp_temp_read(sc, LM75_REG_TOS_SET_POINT, 259 &sc->sc_smax, 1) != 0) { 260 aprint_error_dev(self, "unable to read Tos register\n"); 261 iic_release_bus(sc->sc_tag, 0); 262 return; 263 } 264 } 265 sc->sc_tmax = sc->sc_smax; 266 267 if (i == lmtemp_lm75) 268 lmtemp_setup_sysctl(sc); 269 270 /* Set the configuration of the LM75 to defaults. */ 271 if (lmtemp_config_write(sc, LM75_CONFIG_FAULT_QUEUE_4) != 0) { 272 aprint_error_dev(self, "unable to write config register\n"); 273 iic_release_bus(sc->sc_tag, 0); 274 return; 275 } 276 iic_release_bus(sc->sc_tag, 0); 277 278 sc->sc_sme = sysmon_envsys_create(); 279 /* Initialize sensor data. */ 280 sc->sc_sensor.units = ENVSYS_STEMP; 281 sc->sc_sensor.state = ENVSYS_SINVALID; 282 sc->sc_sensor.flags = ENVSYS_FMONLIMITS; 283 284 (void)strlcpy(name, 285 ia->ia_name? ia->ia_name : device_xname(self), 286 sizeof(sc->sc_sensor.desc)); 287 288 if (prop_dictionary_get_cstring_nocopy(sc->sc_prop, "s00", &desc)) { 289 strncpy(name, desc, 64); 290 } 291 292 (void)strlcpy(sc->sc_sensor.desc, name, 293 sizeof(sc->sc_sensor.desc)); 294 if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor)) { 295 sysmon_envsys_destroy(sc->sc_sme); 296 return; 297 } 298 299 /* Hook into system monitor. */ 300 sc->sc_sme->sme_name = device_xname(self); 301 sc->sc_sme->sme_cookie = sc; 302 sc->sc_sme->sme_refresh = lmtemp_refresh; 303 sc->sc_sme->sme_get_limits = lmtemptbl[i].lmtemp_getlim; 304 sc->sc_sme->sme_set_limits = lmtemptbl[i].lmtemp_setlim; 305 306 if (sysmon_envsys_register(sc->sc_sme)) { 307 aprint_error_dev(self, "unable to register with sysmon\n"); 308 sysmon_envsys_destroy(sc->sc_sme); 309 } 310 } 311 312 static int 313 lmtemp_config_write(struct lmtemp_softc *sc, uint8_t val) 314 { 315 uint8_t cmdbuf[2]; 316 317 cmdbuf[0] = LM75_REG_CONFIG; 318 cmdbuf[1] = val; 319 320 return iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 321 sc->sc_address, cmdbuf, 1, &cmdbuf[1], 1, 0); 322 } 323 324 static int 325 lmtemp_temp_write(struct lmtemp_softc *sc, uint8_t reg, uint32_t val, int degc) 326 { 327 uint8_t cmdbuf[3]; 328 329 cmdbuf[0] = reg; 330 sc->sc_lmtemp_encode(val, &cmdbuf[1], degc); 331 332 return iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 333 sc->sc_address, cmdbuf, 1, &cmdbuf[1], 2, 0); 334 } 335 336 static int 337 lmtemp_temp_read(struct lmtemp_softc *sc, uint8_t which, uint32_t *valp, 338 int degc) 339 { 340 int error; 341 uint8_t cmdbuf[1]; 342 uint8_t buf[LM75_TEMP_LEN]; 343 344 cmdbuf[0] = which; 345 346 error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 347 sc->sc_address, cmdbuf, 1, buf, LM75_TEMP_LEN, 0); 348 if (error) 349 return error; 350 351 *valp = sc->sc_lmtemp_decode(buf, degc); 352 return 0; 353 } 354 355 static void 356 lmtemp_refresh_sensor_data(struct lmtemp_softc *sc) 357 { 358 uint32_t val; 359 int error; 360 361 error = lmtemp_temp_read(sc, LM75_REG_TEMP, &val, 0); 362 if (error) { 363 #if 0 364 aprint_error_dev(sc->sc_dev, "unable to read temperature, error = %d\n", 365 error); 366 #endif 367 sc->sc_sensor.state = ENVSYS_SINVALID; 368 return; 369 } 370 371 sc->sc_sensor.value_cur = val; 372 sc->sc_sensor.state = ENVSYS_SVALID; 373 } 374 375 static void 376 lmtemp_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 377 { 378 struct lmtemp_softc *sc = sme->sme_cookie; 379 380 iic_acquire_bus(sc->sc_tag, 0); /* also locks our instance */ 381 lmtemp_refresh_sensor_data(sc); 382 iic_release_bus(sc->sc_tag, 0); /* also unlocks our instance */ 383 } 384 385 static void 386 lmtemp_getlim_lm75(struct sysmon_envsys *sme, envsys_data_t *edata, 387 sysmon_envsys_lim_t *limits, uint32_t *props) 388 { 389 struct lmtemp_softc *sc = sme->sme_cookie; 390 uint32_t val; 391 392 *props &= ~(PROP_CRITMAX); 393 394 iic_acquire_bus(sc->sc_tag, 0); 395 if (lmtemp_temp_read(sc, LM75_REG_TOS_SET_POINT, &val, 0) == 0) { 396 limits->sel_critmax = val; 397 *props |= PROP_CRITMAX; 398 } 399 iic_release_bus(sc->sc_tag, 0); 400 } 401 402 static void 403 lmtemp_getlim_lm77(struct sysmon_envsys *sme, envsys_data_t *edata, 404 sysmon_envsys_lim_t *limits, uint32_t *props) 405 { 406 struct lmtemp_softc *sc = sme->sme_cookie; 407 uint32_t val; 408 409 *props &= ~(PROP_CRITMAX | PROP_WARNMAX | PROP_WARNMIN); 410 411 iic_acquire_bus(sc->sc_tag, 0); 412 if (lmtemp_temp_read(sc, LM77_REG_TCRIT_SET_POINT, &val, 0) == 0) { 413 limits->sel_critmax = val; 414 *props |= PROP_CRITMAX; 415 } 416 if (lmtemp_temp_read(sc, LM77_REG_THIGH_SET_POINT, &val, 0) == 0) { 417 limits->sel_warnmax = val; 418 *props |= PROP_WARNMAX; 419 } 420 if (lmtemp_temp_read(sc, LM77_REG_TLOW_SET_POINT, &val, 0) == 0) { 421 limits->sel_warnmin = val; 422 *props |= PROP_WARNMIN; 423 } 424 iic_release_bus(sc->sc_tag, 0); 425 } 426 427 static void 428 lmtemp_setlim_lm75(struct sysmon_envsys *sme, envsys_data_t *edata, 429 sysmon_envsys_lim_t *limits, uint32_t *props) 430 { 431 struct lmtemp_softc *sc = sme->sme_cookie; 432 int32_t limit; 433 434 if (*props & PROP_CRITMAX) { 435 if (limits == NULL) /* Restore defaults */ 436 limit = sc->sc_smax; 437 else 438 limit = limits->sel_critmax; 439 iic_acquire_bus(sc->sc_tag, 0); 440 lmtemp_temp_write(sc, LM75_REG_THYST_SET_POINT, 441 limit - 5000000, 0); 442 lmtemp_temp_write(sc, LM75_REG_TOS_SET_POINT, limit, 0); 443 iic_release_bus(sc->sc_tag, 0); 444 445 /* Synchronise sysctl */ 446 sc->sc_tmax = (limit - 273150000) / 1000000; 447 } 448 } 449 450 static void 451 lmtemp_setlim_lm77(struct sysmon_envsys *sme, envsys_data_t *edata, 452 sysmon_envsys_lim_t *limits, uint32_t *props) 453 { 454 struct lmtemp_softc *sc = sme->sme_cookie; 455 int32_t limit; 456 457 iic_acquire_bus(sc->sc_tag, 0); 458 if (*props & PROP_CRITMAX) { 459 if (limits == NULL) /* Restore defaults */ 460 limit = sc->sc_scrit; 461 else 462 limit = limits->sel_critmax; 463 lmtemp_temp_write(sc, LM77_REG_TCRIT_SET_POINT, limit, 0); 464 } 465 if (*props & PROP_WARNMAX) { 466 if (limits == NULL) /* Restore defaults */ 467 limit = sc->sc_smax; 468 else 469 limit = limits->sel_warnmax; 470 lmtemp_temp_write(sc, LM77_REG_THIGH_SET_POINT, limit, 0); 471 } 472 if (*props & PROP_WARNMIN) { 473 if (limits == NULL) /* Restore defaults */ 474 limit = sc->sc_smin; 475 else 476 limit = limits->sel_warnmin; 477 lmtemp_temp_write(sc, LM77_REG_TLOW_SET_POINT, limit, 0); 478 } 479 iic_release_bus(sc->sc_tag, 0); 480 } 481 482 static uint32_t 483 lmtemp_decode_lm75(const uint8_t *buf, int degc) 484 { 485 int temp; 486 uint32_t val; 487 488 /* 489 * LM75 temps are the most-significant 9 bits of a 16-bit reg. 490 * sign-extend the MSB and add in the 0.5 from the LSB 491 */ 492 temp = (int8_t) buf[0]; 493 temp = (temp << 1) + ((buf[1] >> 7) & 0x1); 494 495 /* Temp is given in 1/2 deg. C, we convert to C or uK. */ 496 if (degc) 497 val = temp / 2; 498 else 499 val = temp * 500000 + 273150000; 500 501 return val; 502 } 503 504 static uint32_t 505 lmtemp_decode_ds75(const uint8_t *buf, int degc) 506 { 507 int temp; 508 509 /* 510 * Sign-extend the MSB byte, and add in the fractions of a 511 * degree contained in the LSB (precision 1/16th DegC). 512 */ 513 temp = (int8_t)buf[0]; 514 temp = (temp << 4) | ((buf[1] >> 4) & 0xf); 515 516 /* 517 * Conversion to C or uK is simple. 518 */ 519 if (degc) 520 return temp / 16; 521 else 522 return (temp * 62500 + 273150000); 523 } 524 525 static uint32_t 526 lmtemp_decode_lm77(const uint8_t *buf, int degc) 527 { 528 int temp; 529 uint32_t val; 530 531 /* 532 * Describe each bits of temperature registers on LM77. 533 * D15 - D12: Sign 534 * D11 - D3 : Bit8(MSB) - Bit0 535 */ 536 temp = (int8_t)buf[0]; 537 temp = (temp << 5) | ((buf[1] >> 3) & 0x1f); 538 539 /* Temp is given in 1/2 deg. C, we convert to C or uK. */ 540 if (degc) 541 val = temp / 2; 542 else 543 val = temp * 500000 + 273150000; 544 545 return val; 546 } 547 548 static void lmtemp_encode_lm75(const uint32_t val, uint8_t *buf, int degc) 549 { 550 int temp; 551 552 /* Convert from C or uK to register format */ 553 if (degc) 554 temp = val * 2; 555 else 556 temp = (val - 273150000) / 500000; 557 buf[0] = (temp >> 1) & 0xff; 558 buf[1] = (temp & 1) << 7; 559 } 560 561 static void lmtemp_encode_ds75(const uint32_t val, uint8_t *buf, int degc) 562 { 563 int temp; 564 565 /* Convert from C or uK to register format */ 566 if (degc) 567 temp = val * 16; 568 else 569 temp = (val - 273150000) / 62500; 570 buf[0] = (temp >> 4) & 0xff; 571 buf[1] = (temp & 0xf) << 4; 572 } 573 574 static void lmtemp_encode_lm77(const uint32_t val, uint8_t *buf, int degc) 575 { 576 int temp; 577 578 /* Convert from C or uK to register format */ 579 if (degc) 580 temp = val * 2; 581 else 582 temp = (val - 273150000) / 500000; 583 buf[0] = (temp >> 5) & 0xff; 584 buf[1] = (temp & 0x1f) << 3; 585 } 586 587 static void 588 lmtemp_setup_sysctl(struct lmtemp_softc *sc) 589 { 590 const struct sysctlnode *me = NULL, *node = NULL; 591 592 sysctl_createv(NULL, 0, NULL, &me, 593 CTLFLAG_READWRITE, 594 CTLTYPE_NODE, device_xname(sc->sc_dev), NULL, 595 NULL, 0, NULL, 0, 596 CTL_MACHDEP, CTL_CREATE, CTL_EOL); 597 598 sysctl_createv(NULL, 0, NULL, &node, 599 CTLFLAG_READWRITE | CTLFLAG_OWNDESC, 600 CTLTYPE_INT, "temp", "Threshold temperature", 601 sysctl_lm75_temp, 1, (void *)sc, 0, 602 CTL_MACHDEP, me->sysctl_num, CTL_CREATE, CTL_EOL); 603 } 604 605 static int 606 sysctl_lm75_temp(SYSCTLFN_ARGS) 607 { 608 struct sysctlnode node = *rnode; 609 struct lmtemp_softc *sc = node.sysctl_data; 610 int temp; 611 612 if (newp) { 613 614 /* we're asked to write */ 615 node.sysctl_data = &sc->sc_tmax; 616 if (sysctl_lookup(SYSCTLFN_CALL(&node)) == 0) { 617 618 temp = *(int *)node.sysctl_data; 619 sc->sc_tmax = temp; 620 iic_acquire_bus(sc->sc_tag, 0); 621 lmtemp_temp_write(sc, LM75_REG_THYST_SET_POINT, 622 sc->sc_tmax - 5, 1); 623 lmtemp_temp_write(sc, LM75_REG_TOS_SET_POINT, 624 sc->sc_tmax, 1); 625 iic_release_bus(sc->sc_tag, 0); 626 627 /* Synchronise envsys - calls lmtemp_getlim_lm75() */ 628 sysmon_envsys_update_limits(sc->sc_sme, &sc->sc_sensor); 629 return 0; 630 } 631 return EINVAL; 632 } else { 633 634 node.sysctl_data = &sc->sc_tmax; 635 node.sysctl_size = 4; 636 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 637 } 638 639 return 0; 640 } 641 642 SYSCTL_SETUP(sysctl_lmtemp_setup, "sysctl lmtemp subtree setup") 643 { 644 645 sysctl_createv(NULL, 0, NULL, NULL, 646 CTLFLAG_PERMANENT, 647 CTLTYPE_NODE, "machdep", NULL, 648 NULL, 0, NULL, 0, 649 CTL_MACHDEP, CTL_EOL); 650 } 651 652 653
Indexes created Thu Oct 02 01:09:59 GMT 2025