lm75.c revision 1.43
1 /* $NetBSD: lm75.c,v 1.43 2021/05/21 20:42:05 macallan 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 1.43 2021/05/21 20:42:05 macallan 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; 218 219 if (ia->ia_prop != NULL) prop_object_retain(sc->sc_prop); 220 221 aprint_naive(": Temperature Sensor\n"); 222 if (ia->ia_name) { 223 aprint_normal(": %s %s Temperature Sensor\n", ia->ia_name, 224 lmtemptbl[i].lmtemp_name); 225 } else { 226 aprint_normal(": %s Temperature Sensor\n", 227 lmtemptbl[i].lmtemp_name); 228 } 229 230 sc->sc_lmtemp_decode = lmtemptbl[i].lmtemp_decode; 231 sc->sc_lmtemp_encode = lmtemptbl[i].lmtemp_encode; 232 233 iic_acquire_bus(sc->sc_tag, 0); 234 235 /* Read temperature limit(s) and remember initial value(s). */ 236 if (i == lmtemp_lm77) { 237 if (lmtemp_temp_read(sc, LM77_REG_TCRIT_SET_POINT, 238 &sc->sc_scrit, 1) != 0) { 239 aprint_error_dev(self, 240 "unable to read low register\n"); 241 iic_release_bus(sc->sc_tag, 0); 242 return; 243 } 244 if (lmtemp_temp_read(sc, LM77_REG_TLOW_SET_POINT, 245 &sc->sc_smin, 1) != 0) { 246 aprint_error_dev(self, 247 "unable to read low register\n"); 248 iic_release_bus(sc->sc_tag, 0); 249 return; 250 } 251 if (lmtemp_temp_read(sc, LM77_REG_THIGH_SET_POINT, 252 &sc->sc_smax, 1) != 0) { 253 aprint_error_dev(self, 254 "unable to read high register\n"); 255 iic_release_bus(sc->sc_tag, 0); 256 return; 257 } 258 } else { /* LM75 or compatible */ 259 if (lmtemp_temp_read(sc, LM75_REG_TOS_SET_POINT, 260 &sc->sc_smax, 1) != 0) { 261 aprint_error_dev(self, "unable to read Tos register\n"); 262 iic_release_bus(sc->sc_tag, 0); 263 return; 264 } 265 } 266 sc->sc_tmax = sc->sc_smax; 267 268 if (i == lmtemp_lm75) 269 lmtemp_setup_sysctl(sc); 270 271 /* Set the configuration of the LM75 to defaults. */ 272 if (lmtemp_config_write(sc, LM75_CONFIG_FAULT_QUEUE_4) != 0) { 273 aprint_error_dev(self, "unable to write config register\n"); 274 iic_release_bus(sc->sc_tag, 0); 275 return; 276 } 277 iic_release_bus(sc->sc_tag, 0); 278 279 sc->sc_sme = sysmon_envsys_create(); 280 /* Initialize sensor data. */ 281 sc->sc_sensor.units = ENVSYS_STEMP; 282 sc->sc_sensor.state = ENVSYS_SINVALID; 283 sc->sc_sensor.flags = ENVSYS_FMONLIMITS | ENVSYS_FHAS_ENTROPY; 284 285 (void)strlcpy(name, 286 ia->ia_name? ia->ia_name : device_xname(self), 287 sizeof(sc->sc_sensor.desc)); 288 289 if (prop_dictionary_get_cstring_nocopy(sc->sc_prop, "s00", &desc)) { 290 strncpy(name, desc, 64); 291 } 292 293 (void)strlcpy(sc->sc_sensor.desc, name, 294 sizeof(sc->sc_sensor.desc)); 295 if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor)) { 296 sysmon_envsys_destroy(sc->sc_sme); 297 return; 298 } 299 300 /* Hook into system monitor. */ 301 sc->sc_sme->sme_name = device_xname(self); 302 sc->sc_sme->sme_cookie = sc; 303 sc->sc_sme->sme_refresh = lmtemp_refresh; 304 sc->sc_sme->sme_get_limits = lmtemptbl[i].lmtemp_getlim; 305 sc->sc_sme->sme_set_limits = lmtemptbl[i].lmtemp_setlim; 306 307 if (sysmon_envsys_register(sc->sc_sme)) { 308 aprint_error_dev(self, "unable to register with sysmon\n"); 309 sysmon_envsys_destroy(sc->sc_sme); 310 } 311 } 312 313 static int 314 lmtemp_config_write(struct lmtemp_softc *sc, uint8_t val) 315 { 316 uint8_t cmdbuf[2]; 317 318 cmdbuf[0] = LM75_REG_CONFIG; 319 cmdbuf[1] = val; 320 321 return iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 322 sc->sc_address, cmdbuf, 1, &cmdbuf[1], 1, 0); 323 } 324 325 static int 326 lmtemp_temp_write(struct lmtemp_softc *sc, uint8_t reg, uint32_t val, int degc) 327 { 328 uint8_t cmdbuf[3]; 329 330 cmdbuf[0] = reg; 331 sc->sc_lmtemp_encode(val, &cmdbuf[1], degc); 332 333 return iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 334 sc->sc_address, cmdbuf, 1, &cmdbuf[1], 2, 0); 335 } 336 337 static int 338 lmtemp_temp_read(struct lmtemp_softc *sc, uint8_t which, uint32_t *valp, 339 int degc) 340 { 341 int error; 342 uint8_t cmdbuf[1]; 343 uint8_t buf[LM75_TEMP_LEN]; 344 345 cmdbuf[0] = which; 346 347 error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 348 sc->sc_address, cmdbuf, 1, buf, LM75_TEMP_LEN, 0); 349 if (error) 350 return error; 351 352 *valp = sc->sc_lmtemp_decode(buf, degc); 353 return 0; 354 } 355 356 static void 357 lmtemp_refresh_sensor_data(struct lmtemp_softc *sc) 358 { 359 uint32_t val; 360 int error; 361 362 error = lmtemp_temp_read(sc, LM75_REG_TEMP, &val, 0); 363 if (error) { 364 #if 0 365 aprint_error_dev(sc->sc_dev, "unable to read temperature, error = %d\n", 366 error); 367 #endif 368 sc->sc_sensor.state = ENVSYS_SINVALID; 369 return; 370 } 371 372 sc->sc_sensor.value_cur = val; 373 sc->sc_sensor.state = ENVSYS_SVALID; 374 } 375 376 static void 377 lmtemp_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 378 { 379 struct lmtemp_softc *sc = sme->sme_cookie; 380 381 iic_acquire_bus(sc->sc_tag, 0); /* also locks our instance */ 382 lmtemp_refresh_sensor_data(sc); 383 iic_release_bus(sc->sc_tag, 0); /* also unlocks our instance */ 384 } 385 386 static void 387 lmtemp_getlim_lm75(struct sysmon_envsys *sme, envsys_data_t *edata, 388 sysmon_envsys_lim_t *limits, uint32_t *props) 389 { 390 struct lmtemp_softc *sc = sme->sme_cookie; 391 uint32_t val; 392 393 *props &= ~(PROP_CRITMAX); 394 395 iic_acquire_bus(sc->sc_tag, 0); 396 if (lmtemp_temp_read(sc, LM75_REG_TOS_SET_POINT, &val, 0) == 0) { 397 limits->sel_critmax = val; 398 *props |= PROP_CRITMAX; 399 } 400 iic_release_bus(sc->sc_tag, 0); 401 } 402 403 static void 404 lmtemp_getlim_lm77(struct sysmon_envsys *sme, envsys_data_t *edata, 405 sysmon_envsys_lim_t *limits, uint32_t *props) 406 { 407 struct lmtemp_softc *sc = sme->sme_cookie; 408 uint32_t val; 409 410 *props &= ~(PROP_CRITMAX | PROP_WARNMAX | PROP_WARNMIN); 411 412 iic_acquire_bus(sc->sc_tag, 0); 413 if (lmtemp_temp_read(sc, LM77_REG_TCRIT_SET_POINT, &val, 0) == 0) { 414 limits->sel_critmax = val; 415 *props |= PROP_CRITMAX; 416 } 417 if (lmtemp_temp_read(sc, LM77_REG_THIGH_SET_POINT, &val, 0) == 0) { 418 limits->sel_warnmax = val; 419 *props |= PROP_WARNMAX; 420 } 421 if (lmtemp_temp_read(sc, LM77_REG_TLOW_SET_POINT, &val, 0) == 0) { 422 limits->sel_warnmin = val; 423 *props |= PROP_WARNMIN; 424 } 425 iic_release_bus(sc->sc_tag, 0); 426 } 427 428 static void 429 lmtemp_setlim_lm75(struct sysmon_envsys *sme, envsys_data_t *edata, 430 sysmon_envsys_lim_t *limits, uint32_t *props) 431 { 432 struct lmtemp_softc *sc = sme->sme_cookie; 433 int32_t limit; 434 435 if (*props & PROP_CRITMAX) { 436 if (limits == NULL) /* Restore defaults */ 437 limit = sc->sc_smax; 438 else 439 limit = limits->sel_critmax; 440 iic_acquire_bus(sc->sc_tag, 0); 441 lmtemp_temp_write(sc, LM75_REG_THYST_SET_POINT, 442 limit - 5000000, 0); 443 lmtemp_temp_write(sc, LM75_REG_TOS_SET_POINT, limit, 0); 444 iic_release_bus(sc->sc_tag, 0); 445 446 /* Synchronise sysctl */ 447 sc->sc_tmax = (limit - 273150000) / 1000000; 448 } 449 } 450 451 static void 452 lmtemp_setlim_lm77(struct sysmon_envsys *sme, envsys_data_t *edata, 453 sysmon_envsys_lim_t *limits, uint32_t *props) 454 { 455 struct lmtemp_softc *sc = sme->sme_cookie; 456 int32_t limit; 457 458 iic_acquire_bus(sc->sc_tag, 0); 459 if (*props & PROP_CRITMAX) { 460 if (limits == NULL) /* Restore defaults */ 461 limit = sc->sc_scrit; 462 else 463 limit = limits->sel_critmax; 464 lmtemp_temp_write(sc, LM77_REG_TCRIT_SET_POINT, limit, 0); 465 } 466 if (*props & PROP_WARNMAX) { 467 if (limits == NULL) /* Restore defaults */ 468 limit = sc->sc_smax; 469 else 470 limit = limits->sel_warnmax; 471 lmtemp_temp_write(sc, LM77_REG_THIGH_SET_POINT, limit, 0); 472 } 473 if (*props & PROP_WARNMIN) { 474 if (limits == NULL) /* Restore defaults */ 475 limit = sc->sc_smin; 476 else 477 limit = limits->sel_warnmin; 478 lmtemp_temp_write(sc, LM77_REG_TLOW_SET_POINT, limit, 0); 479 } 480 iic_release_bus(sc->sc_tag, 0); 481 } 482 483 static uint32_t 484 lmtemp_decode_lm75(const uint8_t *buf, int degc) 485 { 486 int temp; 487 uint32_t val; 488 489 /* 490 * LM75 temps are the most-significant 9 bits of a 16-bit reg. 491 * sign-extend the MSB and add in the 0.5 from the LSB 492 */ 493 temp = (int8_t) buf[0]; 494 temp = (temp << 1) + ((buf[1] >> 7) & 0x1); 495 496 /* Temp is given in 1/2 deg. C, we convert to C or uK. */ 497 if (degc) 498 val = temp / 2; 499 else 500 val = temp * 500000 + 273150000; 501 502 return val; 503 } 504 505 static uint32_t 506 lmtemp_decode_ds75(const uint8_t *buf, int degc) 507 { 508 int temp; 509 510 /* 511 * Sign-extend the MSB byte, and add in the fractions of a 512 * degree contained in the LSB (precision 1/16th DegC). 513 */ 514 temp = (int8_t)buf[0]; 515 temp = (temp << 4) | ((buf[1] >> 4) & 0xf); 516 517 /* 518 * Conversion to C or uK is simple. 519 */ 520 if (degc) 521 return temp / 16; 522 else 523 return (temp * 62500 + 273150000); 524 } 525 526 static uint32_t 527 lmtemp_decode_lm77(const uint8_t *buf, int degc) 528 { 529 int temp; 530 uint32_t val; 531 532 /* 533 * Describe each bits of temperature registers on LM77. 534 * D15 - D12: Sign 535 * D11 - D3 : Bit8(MSB) - Bit0 536 */ 537 temp = (int8_t)buf[0]; 538 temp = (temp << 5) | ((buf[1] >> 3) & 0x1f); 539 540 /* Temp is given in 1/2 deg. C, we convert to C or uK. */ 541 if (degc) 542 val = temp / 2; 543 else 544 val = temp * 500000 + 273150000; 545 546 return val; 547 } 548 549 static void lmtemp_encode_lm75(const uint32_t val, uint8_t *buf, int degc) 550 { 551 int temp; 552 553 /* Convert from C or uK to register format */ 554 if (degc) 555 temp = val * 2; 556 else 557 temp = (val - 273150000) / 500000; 558 buf[0] = (temp >> 1) & 0xff; 559 buf[1] = (temp & 1) << 7; 560 } 561 562 static void lmtemp_encode_ds75(const uint32_t val, uint8_t *buf, int degc) 563 { 564 int temp; 565 566 /* Convert from C or uK to register format */ 567 if (degc) 568 temp = val * 16; 569 else 570 temp = (val - 273150000) / 62500; 571 buf[0] = (temp >> 4) & 0xff; 572 buf[1] = (temp & 0xf) << 4; 573 } 574 575 static void lmtemp_encode_lm77(const uint32_t val, uint8_t *buf, int degc) 576 { 577 int temp; 578 579 /* Convert from C or uK to register format */ 580 if (degc) 581 temp = val * 2; 582 else 583 temp = (val - 273150000) / 500000; 584 buf[0] = (temp >> 5) & 0xff; 585 buf[1] = (temp & 0x1f) << 3; 586 } 587 588 static void 589 lmtemp_setup_sysctl(struct lmtemp_softc *sc) 590 { 591 const struct sysctlnode *me = NULL, *node = NULL; 592 593 sysctl_createv(NULL, 0, NULL, &me, 594 CTLFLAG_READWRITE, 595 CTLTYPE_NODE, device_xname(sc->sc_dev), NULL, 596 NULL, 0, NULL, 0, 597 CTL_MACHDEP, CTL_CREATE, CTL_EOL); 598 599 sysctl_createv(NULL, 0, NULL, &node, 600 CTLFLAG_READWRITE | CTLFLAG_OWNDESC, 601 CTLTYPE_INT, "temp", "Threshold temperature", 602 sysctl_lm75_temp, 1, (void *)sc, 0, 603 CTL_MACHDEP, me->sysctl_num, CTL_CREATE, CTL_EOL); 604 } 605 606 static int 607 sysctl_lm75_temp(SYSCTLFN_ARGS) 608 { 609 struct sysctlnode node = *rnode; 610 struct lmtemp_softc *sc = node.sysctl_data; 611 int temp; 612 613 if (newp) { 614 615 /* we're asked to write */ 616 node.sysctl_data = &sc->sc_tmax; 617 if (sysctl_lookup(SYSCTLFN_CALL(&node)) == 0) { 618 619 temp = *(int *)node.sysctl_data; 620 sc->sc_tmax = temp; 621 iic_acquire_bus(sc->sc_tag, 0); 622 lmtemp_temp_write(sc, LM75_REG_THYST_SET_POINT, 623 sc->sc_tmax - 5, 1); 624 lmtemp_temp_write(sc, LM75_REG_TOS_SET_POINT, 625 sc->sc_tmax, 1); 626 iic_release_bus(sc->sc_tag, 0); 627 628 /* Synchronise envsys - calls lmtemp_getlim_lm75() */ 629 sysmon_envsys_update_limits(sc->sc_sme, &sc->sc_sensor); 630 return 0; 631 } 632 return EINVAL; 633 } else { 634 635 node.sysctl_data = &sc->sc_tmax; 636 node.sysctl_size = 4; 637 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 638 } 639 640 return 0; 641 } 642 643 SYSCTL_SETUP(sysctl_lmtemp_setup, "sysctl lmtemp subtree setup") 644 { 645 646 sysctl_createv(NULL, 0, NULL, NULL, 647 CTLFLAG_PERMANENT, 648 CTLTYPE_NODE, "machdep", NULL, 649 NULL, 0, NULL, 0, 650 CTL_MACHDEP, CTL_EOL); 651 } 652 653 654
Indexes created Thu Oct 02 10:09:58 GMT 2025