lm75.c revision 1.49
1 /* $NetBSD: lm75.c,v 1.49 2025/09/21 13:54:56 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 1.49 2025/09/21 13:54:56 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 57 struct sysmon_envsys *sc_sme; 58 envsys_data_t sc_sensor; 59 int sc_tmax; 60 uint32_t sc_smax, sc_smin, sc_scrit; 61 62 uint32_t (*sc_lmtemp_decode)(const uint8_t *, int); 63 void (*sc_lmtemp_encode)(const uint32_t, uint8_t *, int); 64 }; 65 66 static int lmtemp_match(device_t, cfdata_t, void *); 67 static void lmtemp_attach(device_t, device_t, void *); 68 69 CFATTACH_DECL_NEW(lmtemp, sizeof(struct lmtemp_softc), 70 lmtemp_match, lmtemp_attach, NULL, NULL); 71 72 static void lmtemp_refresh(struct sysmon_envsys *, envsys_data_t *); 73 static int lmtemp_config_write(struct lmtemp_softc *, uint8_t); 74 static int lmtemp_temp_write(struct lmtemp_softc *, uint8_t, uint32_t, 75 int); 76 static int lmtemp_temp_read(struct lmtemp_softc *, uint8_t, uint32_t *, 77 int); 78 static uint32_t lmtemp_decode_lm75(const uint8_t *, int); 79 static uint32_t lmtemp_decode_ds75(const uint8_t *, int); 80 static uint32_t lmtemp_decode_lm77(const uint8_t *, int); 81 static void lmtemp_encode_lm75(const uint32_t, uint8_t *, int); 82 static void lmtemp_encode_ds75(const uint32_t, uint8_t *, int); 83 static void lmtemp_encode_lm77(const uint32_t, uint8_t *, int); 84 static void lmtemp_getlim_lm75(struct sysmon_envsys *, envsys_data_t *, 85 sysmon_envsys_lim_t *, uint32_t *); 86 static void lmtemp_getlim_lm77(struct sysmon_envsys *, envsys_data_t *, 87 sysmon_envsys_lim_t *, uint32_t *); 88 static void lmtemp_setlim_lm75(struct sysmon_envsys *, envsys_data_t *, 89 sysmon_envsys_lim_t *, uint32_t *); 90 static void lmtemp_setlim_lm77(struct sysmon_envsys *, envsys_data_t *, 91 sysmon_envsys_lim_t *, uint32_t *); 92 93 static void lmtemp_setup_sysctl(struct lmtemp_softc *); 94 static int sysctl_lm75_temp(SYSCTLFN_ARGS); 95 96 enum { 97 lmtemp_lm75 = 0, 98 lmtemp_ds75 = 1, 99 lmtemp_lm77 = 2, 100 }; 101 102 static const struct device_compatible_entry compat_data[] = { 103 { .compat = "national,lm75", .value = lmtemp_lm75 }, 104 { .compat = "i2c-lm75", .value = lmtemp_lm75 }, 105 { .compat = "lm75", .value = lmtemp_lm75 }, 106 107 /* XXX Linux treats ds1775 and ds75 differently. */ 108 { .compat = "dallas,ds1775", .value = lmtemp_ds75 }, 109 { .compat = "ds1775", .value = lmtemp_ds75 }, 110 111 { .compat = "national,lm77", .value = lmtemp_lm77 }, 112 113 /* 114 * see XXX in _attach() below: add code once non-lm75 matches are 115 * added here! 116 */ 117 DEVICE_COMPAT_EOL 118 }; 119 120 static const struct { 121 const char *lmtemp_name; 122 int lmtemp_addrmask; 123 int lmtemp_addr; 124 uint32_t (*lmtemp_decode)(const uint8_t *, int); 125 void (*lmtemp_encode)(const uint32_t, uint8_t *, int); 126 void (*lmtemp_getlim)(struct sysmon_envsys *, envsys_data_t *, 127 sysmon_envsys_lim_t *, uint32_t *); 128 void (*lmtemp_setlim)(struct sysmon_envsys *, envsys_data_t *, 129 sysmon_envsys_lim_t *, uint32_t *); 130 } lmtemptbl[] = { 131 [lmtemp_lm75] = 132 { 133 .lmtemp_name = "LM75", 134 .lmtemp_addrmask = LM75_ADDRMASK, 135 .lmtemp_addr = LM75_ADDR, 136 .lmtemp_decode = lmtemp_decode_lm75, 137 .lmtemp_encode = lmtemp_encode_lm75, 138 .lmtemp_getlim = lmtemp_getlim_lm75, 139 .lmtemp_setlim = lmtemp_setlim_lm75, 140 }, 141 [lmtemp_ds75] = 142 { 143 .lmtemp_name = "DS75", 144 .lmtemp_addrmask = LM75_ADDRMASK, 145 .lmtemp_addr = LM75_ADDR, 146 .lmtemp_decode = lmtemp_decode_ds75, 147 .lmtemp_encode = lmtemp_encode_ds75, 148 .lmtemp_getlim = lmtemp_getlim_lm75, 149 .lmtemp_setlim = lmtemp_setlim_lm75, 150 }, 151 [lmtemp_lm77] = 152 { 153 .lmtemp_name = "LM77", 154 .lmtemp_addrmask = LM77_ADDRMASK, 155 .lmtemp_addr = LM77_ADDR, 156 .lmtemp_decode = lmtemp_decode_lm77, 157 .lmtemp_encode = lmtemp_encode_lm77, 158 .lmtemp_getlim = lmtemp_getlim_lm77, 159 .lmtemp_setlim = lmtemp_setlim_lm77, 160 }, 161 }; 162 163 static int 164 lmtemp_match(device_t parent, cfdata_t cf, void *aux) 165 { 166 struct i2c_attach_args *ia = aux; 167 int i, match_result; 168 169 if (iic_use_direct_match(ia, cf, compat_data, &match_result)) 170 return match_result; 171 172 /* 173 * Indirect config - not much we can do! 174 */ 175 for (i = 0; i < __arraycount(lmtemptbl); i++) { 176 if (i == cf->cf_flags) { 177 break; 178 } 179 } 180 if (i == __arraycount(lmtemptbl)) { 181 return 0; 182 } 183 184 if ((ia->ia_addr & lmtemptbl[i].lmtemp_addrmask) == 185 lmtemptbl[i].lmtemp_addr) 186 return I2C_MATCH_ADDRESS_ONLY; 187 188 return 0; 189 } 190 191 static void 192 lmtemp_attach(device_t parent, device_t self, void *aux) 193 { 194 struct lmtemp_softc *sc = device_private(self); 195 struct i2c_attach_args *ia = aux; 196 const struct device_compatible_entry *dce; 197 char name[64]; 198 const char *desc; 199 int i; 200 uint8_t config = LM75_CONFIG_FAULT_QUEUE_4; 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; 217 218 aprint_naive(": Temperature Sensor\n"); 219 if (ia->ia_name) { 220 aprint_normal(": %s %s Temperature Sensor\n", ia->ia_name, 221 lmtemptbl[i].lmtemp_name); 222 } else { 223 aprint_normal(": %s Temperature Sensor\n", 224 lmtemptbl[i].lmtemp_name); 225 } 226 227 sc->sc_lmtemp_decode = lmtemptbl[i].lmtemp_decode; 228 sc->sc_lmtemp_encode = lmtemptbl[i].lmtemp_encode; 229 230 if (iic_acquire_bus(sc->sc_tag, 0)) { 231 aprint_error_dev(self, 232 "unable to acquire I2C bus\n"); 233 return; 234 } 235 236 /* Read temperature limit(s) and remember initial value(s). */ 237 if (i == lmtemp_lm77) { 238 if (lmtemp_temp_read(sc, LM77_REG_TCRIT_SET_POINT, 239 &sc->sc_scrit, 1) != 0) { 240 aprint_error_dev(self, 241 "unable to read low register\n"); 242 iic_release_bus(sc->sc_tag, 0); 243 return; 244 } 245 if (lmtemp_temp_read(sc, LM77_REG_TLOW_SET_POINT, 246 &sc->sc_smin, 1) != 0) { 247 aprint_error_dev(self, 248 "unable to read low register\n"); 249 iic_release_bus(sc->sc_tag, 0); 250 return; 251 } 252 if (lmtemp_temp_read(sc, LM77_REG_THIGH_SET_POINT, 253 &sc->sc_smax, 1) != 0) { 254 aprint_error_dev(self, 255 "unable to read high register\n"); 256 iic_release_bus(sc->sc_tag, 0); 257 return; 258 } 259 } else { /* LM75 or compatible */ 260 if (lmtemp_temp_read(sc, LM75_REG_TOS_SET_POINT, 261 &sc->sc_smax, 1) != 0) { 262 aprint_error_dev(self, "unable to read Tos register\n"); 263 iic_release_bus(sc->sc_tag, 0); 264 return; 265 } 266 } 267 sc->sc_tmax = sc->sc_smax; 268 269 if (i == lmtemp_lm75) 270 lmtemp_setup_sysctl(sc); 271 272 /* DS75 has better resolution */ 273 if (i == lmtemp_ds75) 274 config = LM75_CONFIG_FAULT_QUEUE_4 | DS75_CONFIG_RES_11BIT; 275 276 /* Set the configuration of the LM75 to defaults. */ 277 if (lmtemp_config_write(sc, config) != 0) { 278 aprint_error_dev(self, "unable to write config register\n"); 279 iic_release_bus(sc->sc_tag, 0); 280 return; 281 } 282 iic_release_bus(sc->sc_tag, 0); 283 284 sc->sc_sme = sysmon_envsys_create(); 285 /* Initialize sensor data. */ 286 sc->sc_sensor.units = ENVSYS_STEMP; 287 sc->sc_sensor.state = ENVSYS_SINVALID; 288 sc->sc_sensor.flags = ENVSYS_FMONLIMITS | ENVSYS_FHAS_ENTROPY; 289 290 (void)strlcpy(name, 291 ia->ia_name? ia->ia_name : device_xname(self), 292 sizeof(sc->sc_sensor.desc)); 293 294 if (prop_dictionary_get_string(device_properties(self), "s00", &desc)) { 295 strncpy(name, desc, 64); 296 } 297 298 (void)strlcpy(sc->sc_sensor.desc, name, 299 sizeof(sc->sc_sensor.desc)); 300 if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor)) { 301 sysmon_envsys_destroy(sc->sc_sme); 302 return; 303 } 304 305 /* Hook into system monitor. */ 306 sc->sc_sme->sme_name = device_xname(self); 307 sc->sc_sme->sme_cookie = sc; 308 sc->sc_sme->sme_refresh = lmtemp_refresh; 309 sc->sc_sme->sme_get_limits = lmtemptbl[i].lmtemp_getlim; 310 sc->sc_sme->sme_set_limits = lmtemptbl[i].lmtemp_setlim; 311 312 if (sysmon_envsys_register(sc->sc_sme)) { 313 aprint_error_dev(self, "unable to register with sysmon\n"); 314 sysmon_envsys_destroy(sc->sc_sme); 315 } 316 } 317 318 static int 319 lmtemp_config_write(struct lmtemp_softc *sc, uint8_t val) 320 { 321 uint8_t cmdbuf[2]; 322 323 cmdbuf[0] = LM75_REG_CONFIG; 324 cmdbuf[1] = val; 325 326 return iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 327 sc->sc_address, cmdbuf, 1, &cmdbuf[1], 1, 0); 328 } 329 330 static int 331 lmtemp_temp_write(struct lmtemp_softc *sc, uint8_t reg, uint32_t val, int degc) 332 { 333 uint8_t cmdbuf[3]; 334 335 cmdbuf[0] = reg; 336 sc->sc_lmtemp_encode(val, &cmdbuf[1], degc); 337 338 return iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 339 sc->sc_address, cmdbuf, 1, &cmdbuf[1], 2, 0); 340 } 341 342 static int 343 lmtemp_temp_read(struct lmtemp_softc *sc, uint8_t which, uint32_t *valp, 344 int degc) 345 { 346 int error; 347 uint8_t cmdbuf[1]; 348 uint8_t buf[LM75_TEMP_LEN]; 349 350 cmdbuf[0] = which; 351 352 error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 353 sc->sc_address, cmdbuf, 1, buf, LM75_TEMP_LEN, 0); 354 if (error) 355 return error; 356 357 *valp = sc->sc_lmtemp_decode(buf, degc); 358 return 0; 359 } 360 361 static void 362 lmtemp_refresh_sensor_data(struct lmtemp_softc *sc) 363 { 364 uint32_t val; 365 int error; 366 367 error = lmtemp_temp_read(sc, LM75_REG_TEMP, &val, 0); 368 if (error) { 369 #if 0 370 aprint_error_dev(sc->sc_dev, "unable to read temperature, error = %d\n", 371 error); 372 #endif 373 sc->sc_sensor.state = ENVSYS_SINVALID; 374 return; 375 } 376 377 sc->sc_sensor.value_cur = val; 378 sc->sc_sensor.state = ENVSYS_SVALID; 379 } 380 381 static void 382 lmtemp_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 383 { 384 struct lmtemp_softc *sc = sme->sme_cookie; 385 386 if (iic_acquire_bus(sc->sc_tag, 0)) /* also locks our instance */ 387 return; 388 lmtemp_refresh_sensor_data(sc); 389 iic_release_bus(sc->sc_tag, 0); /* also unlocks our instance */ 390 } 391 392 static void 393 lmtemp_getlim_lm75(struct sysmon_envsys *sme, envsys_data_t *edata, 394 sysmon_envsys_lim_t *limits, uint32_t *props) 395 { 396 struct lmtemp_softc *sc = sme->sme_cookie; 397 uint32_t val; 398 399 *props &= ~(PROP_CRITMAX); 400 401 if (iic_acquire_bus(sc->sc_tag, 0)) 402 return; 403 if (lmtemp_temp_read(sc, LM75_REG_TOS_SET_POINT, &val, 0) == 0) { 404 limits->sel_critmax = val; 405 *props |= PROP_CRITMAX; 406 } 407 iic_release_bus(sc->sc_tag, 0); 408 } 409 410 static void 411 lmtemp_getlim_lm77(struct sysmon_envsys *sme, envsys_data_t *edata, 412 sysmon_envsys_lim_t *limits, uint32_t *props) 413 { 414 struct lmtemp_softc *sc = sme->sme_cookie; 415 uint32_t val; 416 417 *props &= ~(PROP_CRITMAX | PROP_WARNMAX | PROP_WARNMIN); 418 419 if (iic_acquire_bus(sc->sc_tag, 0)) 420 return; 421 if (lmtemp_temp_read(sc, LM77_REG_TCRIT_SET_POINT, &val, 0) == 0) { 422 limits->sel_critmax = val; 423 *props |= PROP_CRITMAX; 424 } 425 if (lmtemp_temp_read(sc, LM77_REG_THIGH_SET_POINT, &val, 0) == 0) { 426 limits->sel_warnmax = val; 427 *props |= PROP_WARNMAX; 428 } 429 if (lmtemp_temp_read(sc, LM77_REG_TLOW_SET_POINT, &val, 0) == 0) { 430 limits->sel_warnmin = val; 431 *props |= PROP_WARNMIN; 432 } 433 iic_release_bus(sc->sc_tag, 0); 434 } 435 436 static void 437 lmtemp_setlim_lm75(struct sysmon_envsys *sme, envsys_data_t *edata, 438 sysmon_envsys_lim_t *limits, uint32_t *props) 439 { 440 struct lmtemp_softc *sc = sme->sme_cookie; 441 int32_t limit; 442 443 if (*props & PROP_CRITMAX) { 444 if (limits == NULL) /* Restore defaults */ 445 limit = sc->sc_smax; 446 else 447 limit = limits->sel_critmax; 448 if (iic_acquire_bus(sc->sc_tag, 0)) 449 return; 450 lmtemp_temp_write(sc, LM75_REG_THYST_SET_POINT, 451 limit - 5000000, 0); 452 lmtemp_temp_write(sc, LM75_REG_TOS_SET_POINT, limit, 0); 453 iic_release_bus(sc->sc_tag, 0); 454 455 /* Synchronise sysctl */ 456 sc->sc_tmax = (limit - 273150000) / 1000000; 457 } 458 } 459 460 static void 461 lmtemp_setlim_lm77(struct sysmon_envsys *sme, envsys_data_t *edata, 462 sysmon_envsys_lim_t *limits, uint32_t *props) 463 { 464 struct lmtemp_softc *sc = sme->sme_cookie; 465 int32_t limit; 466 467 iic_acquire_bus(sc->sc_tag, 0); 468 if (*props & PROP_CRITMAX) { 469 if (limits == NULL) /* Restore defaults */ 470 limit = sc->sc_scrit; 471 else 472 limit = limits->sel_critmax; 473 lmtemp_temp_write(sc, LM77_REG_TCRIT_SET_POINT, limit, 0); 474 } 475 if (*props & PROP_WARNMAX) { 476 if (limits == NULL) /* Restore defaults */ 477 limit = sc->sc_smax; 478 else 479 limit = limits->sel_warnmax; 480 lmtemp_temp_write(sc, LM77_REG_THIGH_SET_POINT, limit, 0); 481 } 482 if (*props & PROP_WARNMIN) { 483 if (limits == NULL) /* Restore defaults */ 484 limit = sc->sc_smin; 485 else 486 limit = limits->sel_warnmin; 487 lmtemp_temp_write(sc, LM77_REG_TLOW_SET_POINT, limit, 0); 488 } 489 iic_release_bus(sc->sc_tag, 0); 490 } 491 492 static uint32_t 493 lmtemp_decode_lm75(const uint8_t *buf, int degc) 494 { 495 int temp; 496 uint32_t val; 497 498 /* 499 * LM75 temps are the most-significant 9 bits of a 16-bit reg. 500 * sign-extend the MSB and add in the 0.5 from the LSB 501 */ 502 temp = (int8_t) buf[0]; 503 temp = (temp << 1) + ((buf[1] >> 7) & 0x1); 504 505 /* Temp is given in 1/2 deg. C, we convert to C or uK. */ 506 if (degc) 507 val = temp / 2; 508 else 509 val = temp * 500000 + 273150000; 510 511 return val; 512 } 513 514 static uint32_t 515 lmtemp_decode_ds75(const uint8_t *buf, int degc) 516 { 517 int temp; 518 519 /* 520 * Sign-extend the MSB byte, and add in the fractions of a 521 * degree contained in the LSB (precision 1/16th DegC). 522 */ 523 temp = (int8_t)buf[0]; 524 temp = (temp << 4) | ((buf[1] >> 4) & 0xf); 525 526 /* 527 * Conversion to C or uK is simple. 528 */ 529 if (degc) 530 return temp / 16; 531 else 532 return (temp * 62500 + 273150000); 533 } 534 535 static uint32_t 536 lmtemp_decode_lm77(const uint8_t *buf, int degc) 537 { 538 int temp; 539 uint32_t val; 540 541 /* 542 * Describe each bits of temperature registers on LM77. 543 * D15 - D12: Sign 544 * D11 - D3 : Bit8(MSB) - Bit0 545 */ 546 temp = (int8_t)buf[0]; 547 temp = (temp << 5) | ((buf[1] >> 3) & 0x1f); 548 549 /* Temp is given in 1/2 deg. C, we convert to C or uK. */ 550 if (degc) 551 val = temp / 2; 552 else 553 val = temp * 500000 + 273150000; 554 555 return val; 556 } 557 558 static void lmtemp_encode_lm75(const uint32_t val, uint8_t *buf, int degc) 559 { 560 int temp; 561 562 /* Convert from C or uK to register format */ 563 if (degc) 564 temp = val * 2; 565 else 566 temp = (val - 273150000) / 500000; 567 buf[0] = (temp >> 1) & 0xff; 568 buf[1] = (temp & 1) << 7; 569 } 570 571 static void lmtemp_encode_ds75(const uint32_t val, uint8_t *buf, int degc) 572 { 573 int temp; 574 575 /* Convert from C or uK to register format */ 576 if (degc) 577 temp = val * 16; 578 else 579 temp = (val - 273150000) / 62500; 580 buf[0] = (temp >> 4) & 0xff; 581 buf[1] = (temp & 0xf) << 4; 582 } 583 584 static void lmtemp_encode_lm77(const uint32_t val, uint8_t *buf, int degc) 585 { 586 int temp; 587 588 /* Convert from C or uK to register format */ 589 if (degc) 590 temp = val * 2; 591 else 592 temp = (val - 273150000) / 500000; 593 buf[0] = (temp >> 5) & 0xff; 594 buf[1] = (temp & 0x1f) << 3; 595 } 596 597 static void 598 lmtemp_setup_sysctl(struct lmtemp_softc *sc) 599 { 600 const struct sysctlnode *me = NULL, *node = NULL; 601 602 sysctl_createv(NULL, 0, NULL, &me, 603 CTLFLAG_READWRITE, 604 CTLTYPE_NODE, device_xname(sc->sc_dev), NULL, 605 NULL, 0, NULL, 0, 606 CTL_MACHDEP, CTL_CREATE, CTL_EOL); 607 608 sysctl_createv(NULL, 0, NULL, &node, 609 CTLFLAG_READWRITE | CTLFLAG_OWNDESC, 610 CTLTYPE_INT, "temp", "Threshold temperature", 611 sysctl_lm75_temp, 1, (void *)sc, 0, 612 CTL_MACHDEP, me->sysctl_num, CTL_CREATE, CTL_EOL); 613 } 614 615 static int 616 sysctl_lm75_temp(SYSCTLFN_ARGS) 617 { 618 struct sysctlnode node = *rnode; 619 struct lmtemp_softc *sc = node.sysctl_data; 620 int temp, error; 621 622 if (newp) { 623 624 /* we're asked to write */ 625 node.sysctl_data = &sc->sc_tmax; 626 if (sysctl_lookup(SYSCTLFN_CALL(&node)) == 0) { 627 628 temp = *(int *)node.sysctl_data; 629 sc->sc_tmax = temp; 630 error = iic_acquire_bus(sc->sc_tag, 0); 631 if (error) 632 return error; 633 lmtemp_temp_write(sc, LM75_REG_THYST_SET_POINT, 634 sc->sc_tmax - 5, 1); 635 lmtemp_temp_write(sc, LM75_REG_TOS_SET_POINT, 636 sc->sc_tmax, 1); 637 iic_release_bus(sc->sc_tag, 0); 638 639 /* Synchronise envsys - calls lmtemp_getlim_lm75() */ 640 sysmon_envsys_update_limits(sc->sc_sme, &sc->sc_sensor); 641 return 0; 642 } 643 return EINVAL; 644 } else { 645 646 node.sysctl_data = &sc->sc_tmax; 647 node.sysctl_size = 4; 648 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 649 } 650 651 return 0; 652 } 653 654 SYSCTL_SETUP(sysctl_lmtemp_setup, "sysctl lmtemp subtree setup") 655 { 656 657 sysctl_createv(NULL, 0, NULL, NULL, 658 CTLFLAG_PERMANENT, 659 CTLTYPE_NODE, "machdep", NULL, 660 NULL, 0, NULL, 0, 661 CTL_MACHDEP, CTL_EOL); 662 } 663 664 665
Indexes created Thu Oct 02 01:09:59 GMT 2025