adm1026.c revision 1.8
1 /*- 2 * Copyright (c) 2015 The NetBSD Foundation, Inc. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to The NetBSD Foundation 6 * by Julian Coleman. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __KERNEL_RCSID(0, "$NetBSD: adm1026.c,v 1.8 2020/06/26 10:06:57 martin Exp $"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/device.h> 36 #include <sys/kernel.h> 37 #include <sys/sysctl.h> 38 39 #include <dev/sysmon/sysmonvar.h> 40 41 #include <dev/i2c/i2cvar.h> 42 #include <dev/i2c/adm1026reg.h> 43 44 /* Voltage/analog sensors descriptions and registers */ 45 struct adm1026_volts_info { 46 const char* desc; 47 int incr; 48 uint8_t reg, check_tdm2; 49 }; 50 51 /* Voltage maximums (in mV) from datasheet table 7 divided by 255 increments */ 52 static struct adm1026_volts_info adm1026_volts_table[] = { 53 { "Vbatt", 15624, ADM1026_VBAT_VAL, 0 }, 54 { "V3.3 standby", 17345, ADM1026_33VSTBY_VAL, 0 }, 55 { "V3.3 main", 17345, ADM1026_33VMAIN_VAL, 0 }, 56 { "V5.0", 26016, ADM1026_50V_VAL, 0 }, 57 { "Vccp", 11718, ADM1026_VCCP_VAL, 0 }, 58 { "V+12", 62502, ADM1026_12V_VAL, 0 }, 59 { "V-12", -62502, ADM1026_N12V_VAL, 0 }, 60 { "V3.0 0", 11718, ADM1026_AIN_VAL(0), 0 }, 61 { "V3.0 1", 11718, ADM1026_AIN_VAL(1), 0 }, 62 { "V3.0 2", 11718, ADM1026_AIN_VAL(2), 0 }, 63 { "V3.0 3", 11718, ADM1026_AIN_VAL(3), 0 }, 64 { "V3.0 4", 11718, ADM1026_AIN_VAL(4), 0 }, 65 { "V3.0 5", 11718, ADM1026_AIN_VAL(5), 0 }, 66 { "V2.5 0", 9765, ADM1026_AIN_VAL(6), 0 }, 67 { "V2.5 1", 9765, ADM1026_AIN_VAL(7), 0 }, 68 { "V2.5 2", 9765, ADM1026_AIN8_VAL, 1 }, 69 { "V2.5 3", 9765, ADM1026_TDM2_AIN9_VAL, 1 } 70 }; 71 72 /* Maximum number of each type of sensor */ 73 #define ADM1026_MAX_FANS 8 74 #define ADM1026_MAX_TEMPS 3 75 #define ADM1026_MAX_VOLTS (sizeof(adm1026_volts_table) / \ 76 sizeof (adm1026_volts_table[0])) 77 78 /* Map sensor to/from sysmon numbers */ 79 #define ADM1026_FAN_NUM(x) (x) 80 #define ADM1026_TEMP_NUM(x) (x + sc->sc_nfans) 81 #define ADM1026_VOLT_NUM(x) (x + sc->sc_nfans + sc->sc_ntemps) 82 #define ADM1026_NUM_FAN(x) (x) 83 #define ADM1026_NUM_TEMP(x) (x - sc->sc_nfans) 84 #define ADM1026_NUM_VOLT(x) (x - sc->sc_nfans - sc->sc_ntemps) 85 86 struct adm1026_softc { 87 device_t sc_dev; 88 i2c_tag_t sc_tag; 89 int sc_address; 90 bool sc_multi_read; 91 92 uint8_t sc_rev, sc_cfg[2]; 93 int sc_nfans, sc_ntemps; /* Map sysmon numbers to sensors */ 94 int sc_fandiv[ADM1026_MAX_FANS], sc_temp_off[ADM1026_MAX_TEMPS]; 95 struct sysmon_envsys *sc_sme; 96 envsys_data_t sc_sensor[ADM1026_MAX_FANS + ADM1026_MAX_TEMPS + 97 ADM1026_MAX_VOLTS]; 98 }; 99 100 static int adm1026_match(device_t, cfdata_t, void *); 101 static int adm1026_ident(i2c_tag_t, i2c_addr_t, int, uint8_t*); 102 static void adm1026_attach(device_t, device_t, void *); 103 static int adm1026_detach(device_t, int); 104 bool adm1026_pmf_suspend(device_t, const pmf_qual_t *); 105 bool adm1026_pmf_resume(device_t, const pmf_qual_t *); 106 107 static void adm1026_setup_fans(struct adm1026_softc *sc, int div2_val); 108 static void adm1026_setup_temps(struct adm1026_softc *sc); 109 static void adm1026_setup_volts(struct adm1026_softc *sc); 110 111 void adm1026_refresh(struct sysmon_envsys *sme, envsys_data_t *edata); 112 static void adm1026_read_fan(struct adm1026_softc *sc, envsys_data_t *edata); 113 static void adm1026_read_temp(struct adm1026_softc *sc, envsys_data_t *edata); 114 static void adm1026_read_volt(struct adm1026_softc *sc, envsys_data_t *edata); 115 116 static int adm1026_read_reg_int(i2c_tag_t, i2c_addr_t, 117 uint8_t reg, bool multi_read, uint8_t *val); 118 static int adm1026_write_reg(struct adm1026_softc *sc, 119 uint8_t reg, uint8_t val); 120 121 static inline int 122 adm1026_read_reg(struct adm1026_softc *sc, uint8_t reg, uint8_t *val) 123 { 124 return adm1026_read_reg_int(sc->sc_tag, sc->sc_address, reg, 125 sc->sc_multi_read, val); 126 } 127 128 CFATTACH_DECL_NEW(adm1026hm, sizeof(struct adm1026_softc), 129 adm1026_match, adm1026_attach, adm1026_detach, NULL); 130 131 static const struct device_compatible_entry compat_data[] = { 132 { "i2c-adm1026", 0 }, 133 { NULL, 0 } 134 }; 135 136 static int 137 adm1026_match(device_t parent, cfdata_t cf, void *aux) 138 { 139 struct i2c_attach_args *ia = aux; 140 int match_result; 141 uint8_t rev; 142 143 if (iic_use_direct_match(ia, cf, compat_data, &match_result)) 144 return match_result; 145 146 if (ia->ia_addr == ADM1026_ADDR1 147 && adm1026_ident(ia->ia_tag, ia->ia_addr, 1, &rev)) 148 return I2C_MATCH_ADDRESS_AND_PROBE; 149 150 return 0; 151 } 152 153 static int 154 adm1026_ident(i2c_tag_t tag, i2c_addr_t addr, int probe_only, uint8_t *rev) 155 { 156 uint8_t val; 157 int err; 158 159 /* Manufacturer ID and revision/stepping */ 160 err = adm1026_read_reg_int(tag, addr, ADM1026_ID, false, &val); 161 if (err || val != ADM1026_MANF_ID) { 162 if (!probe_only) 163 aprint_verbose("adm1026_ident: " 164 "manufacturer ID invalid or missing\n"); 165 return 0; 166 } 167 err = adm1026_read_reg_int(tag, addr, ADM1026_REV, false, rev); 168 if (err || ADM1026_REVISION(*rev) != ADM1026_MANF_REV) { 169 if (!probe_only) 170 aprint_verbose("adm1026_ident: " 171 "manufacturer revision invalid or missing\n"); 172 return 0; 173 } 174 return 1; 175 } 176 177 static void 178 adm1026_attach(device_t parent, device_t self, void *aux) 179 { 180 struct adm1026_softc *sc = device_private(self); 181 struct i2c_attach_args *ia = aux; 182 prop_dictionary_t props = device_properties(self); 183 uint8_t val, fan_div2; 184 int err, div2_val; 185 186 sc->sc_tag = ia->ia_tag; 187 sc->sc_address = ia->ia_addr; 188 sc->sc_dev = self; 189 190 sc->sc_multi_read = false; 191 prop_dictionary_get_bool(props, "multi_read", &sc->sc_multi_read); 192 if (prop_dictionary_get_uint8(props, "fan_div2", &fan_div2) != 0) 193 div2_val = fan_div2; 194 else 195 div2_val = -1; 196 197 (void) adm1026_ident(sc->sc_tag, sc->sc_address, 0, &sc->sc_rev); 198 aprint_normal(": ADM1026 hardware monitor: rev. 0x%x, step. 0x%x\n", 199 ADM1026_REVISION(sc->sc_rev), ADM1026_STEPPING(sc->sc_rev)); 200 201 /* 202 * Start monitoring if not already monitoring. 203 * Wait 1.8s for the fan readings to stabilise. 204 */ 205 if ((err = adm1026_read_reg(sc, ADM1026_CONF1, &val)) != 0) { 206 aprint_error_dev(sc->sc_dev, ": unable to read conf1\n"); 207 return; 208 } 209 if (!(val & ADM1026_CONF1_MONITOR)) { 210 aprint_normal_dev(sc->sc_dev, 211 ": starting monitoring, waiting 1.8s for readings\n"); 212 val |= ADM1026_CONF1_MONITOR; 213 if ((err = adm1026_write_reg(sc, ADM1026_CONF1, val)) != 0) { 214 aprint_error_dev(sc->sc_dev, 215 ": unable to write conf1\n"); 216 return; 217 } 218 delay(1800000); 219 } 220 sc->sc_cfg[0] = val; 221 222 sc->sc_sme = sysmon_envsys_create(); 223 sc->sc_nfans = 0; 224 adm1026_setup_fans(sc, div2_val); 225 sc->sc_ntemps = 0; 226 adm1026_setup_temps(sc); 227 adm1026_setup_volts(sc); 228 aprint_normal_dev(self, "%d fans, %d temperatures, %d voltages\n", 229 sc->sc_nfans, sc->sc_ntemps, sc->sc_ntemps == 3 ? 15 : 17); 230 231 sc->sc_sme->sme_name = device_xname(self); 232 sc->sc_sme->sme_cookie = sc; 233 sc->sc_sme->sme_refresh = adm1026_refresh; 234 if (sysmon_envsys_register(sc->sc_sme)) { 235 aprint_error_dev(self, 236 "unable to register with sysmon\n"); 237 sysmon_envsys_destroy(sc->sc_sme); 238 return; 239 } 240 241 if (!pmf_device_register(self, adm1026_pmf_suspend, adm1026_pmf_resume)) 242 aprint_error_dev(self, "couldn't establish power handler\n"); 243 244 return; 245 } 246 247 /* 248 * We could stop (suspend/detach) and restart (resume) monitoring, 249 * but we don't do that because some machines have separate 250 * management hardware which can read the sensors. 251 */ 252 bool 253 adm1026_pmf_suspend(device_t dev, const pmf_qual_t *qual) 254 { 255 return true; 256 } 257 258 bool 259 adm1026_pmf_resume(device_t dev, const pmf_qual_t *qual) 260 { 261 return true; 262 } 263 264 static int 265 adm1026_detach(device_t self, int flags) 266 { 267 struct adm1026_softc *sc = device_private(self); 268 269 pmf_device_deregister(self); 270 271 sysmon_envsys_unregister(sc->sc_sme); 272 sc->sc_sme = NULL; 273 274 return 0; 275 } 276 277 static void 278 adm1026_setup_fans(struct adm1026_softc *sc, int div2_val) 279 { 280 int i, err = 0; 281 uint8_t div1, div2; 282 283 /* Read fan-related registers (configuration and divisors) */ 284 if ((err = adm1026_read_reg(sc, ADM1026_CONF2, &sc->sc_cfg[1])) != 0) { 285 aprint_error_dev(sc->sc_dev, "unable to read conf2\n"); 286 return; 287 } 288 if ((err = adm1026_read_reg(sc, ADM1026_FAN_DIV1, &div1)) != 0) { 289 aprint_error_dev(sc->sc_dev, "unable to read fan_div1\n"); 290 return; 291 } 292 sc->sc_fandiv[0] = 1 << ADM1026_FAN0_DIV(div1); 293 sc->sc_fandiv[1] = 1 << ADM1026_FAN1_DIV(div1); 294 sc->sc_fandiv[2] = 1 << ADM1026_FAN2_DIV(div1); 295 sc->sc_fandiv[3] = 1 << ADM1026_FAN3_DIV(div1); 296 if (div2_val < 0) { 297 if ((err = 298 adm1026_read_reg(sc, ADM1026_FAN_DIV2, &div2)) != 0) { 299 aprint_error_dev(sc->sc_dev, 300 "unable to read fan_div2\n"); 301 return; 302 } 303 } else 304 div2 = div2_val; 305 sc->sc_fandiv[4] = 1 << ADM1026_FAN4_DIV(div2); 306 sc->sc_fandiv[5] = 1 << ADM1026_FAN5_DIV(div2); 307 sc->sc_fandiv[6] = 1 << ADM1026_FAN6_DIV(div2); 308 sc->sc_fandiv[7] = 1 << ADM1026_FAN7_DIV(div2); 309 310 for (i = 0; i < ADM1026_MAX_FANS; i++) { 311 sc->sc_sensor[ADM1026_FAN_NUM(i)].state = ENVSYS_SINVALID; 312 /* Check configuration2 register to see which pins are fans. */ 313 if (ADM1026_PIN_IS_FAN(sc->sc_cfg[1], i)) { 314 sc->sc_sensor[ADM1026_FAN_NUM(i)].units = 315 ENVSYS_SFANRPM; 316 snprintf(sc->sc_sensor[ADM1026_FAN_NUM(i)].desc, 317 sizeof(sc->sc_sensor[ADM1026_FAN_NUM(i)].desc), 318 "fan %d", ADM1026_FAN_NUM(i)); 319 sc->sc_nfans++; 320 if (sysmon_envsys_sensor_attach( 321 sc->sc_sme, &sc->sc_sensor[ADM1026_FAN_NUM(i)])) { 322 sysmon_envsys_destroy(sc->sc_sme); 323 aprint_error_dev(sc->sc_dev, 324 "unable to attach fan %d at sysmon\n", i); 325 return; 326 } 327 } 328 } 329 } 330 331 static void 332 adm1026_setup_temps(struct adm1026_softc *sc) 333 { 334 int i; 335 uint8_t val; 336 337 /* Temperature offsets */ 338 if (adm1026_read_reg(sc, ADM1026_INT_TEMP_OFF, &val) 339 != 0) { 340 aprint_error_dev(sc->sc_dev, "unable to read int temp. off.\n"); 341 return; 342 } 343 if (val & 0x80) 344 sc->sc_temp_off[0] = 0 - 1000000 * (val & 0x7f); 345 else 346 sc->sc_temp_off[0] = 1000000 * (val & 0x7f); 347 if (adm1026_read_reg(sc, ADM1026_TDM1_OFF, &val) != 0) { 348 aprint_error_dev(sc->sc_dev, "unable to read tdm1 off.\n"); 349 return; 350 } 351 if (val & 0x80) 352 sc->sc_temp_off[1] = 0 - 1000000 * (val & 0x7f); 353 else 354 sc->sc_temp_off[1] = 1000000 * (val & 0x7f); 355 if (adm1026_read_reg(sc, ADM1026_TDM2_OFF, &val) != 0) { 356 aprint_error_dev(sc->sc_dev, "unable to read tdm2 off.\n"); 357 return; 358 } 359 if (val & 0x80) 360 sc->sc_temp_off[2] = 0 - 1000000 * (val & 0x7f); 361 else 362 sc->sc_temp_off[2] = 1000000 * (val & 0x7f); 363 364 strlcpy(sc->sc_sensor[ADM1026_TEMP_NUM(0)].desc, "internal", 365 sizeof(sc->sc_sensor[ADM1026_TEMP_NUM(0)].desc)); 366 strlcpy(sc->sc_sensor[ADM1026_TEMP_NUM(1)].desc, "external 1", 367 sizeof(sc->sc_sensor[ADM1026_TEMP_NUM(1)].desc)); 368 strlcpy(sc->sc_sensor[ADM1026_TEMP_NUM(2)].desc, "external 2", 369 sizeof(sc->sc_sensor[ADM1026_TEMP_NUM(2)].desc)); 370 for (i = 0; i < ADM1026_MAX_TEMPS; i++) { 371 /* Check configuration1 register to see if TDM2 is configured */ 372 if (i == 2 && !ADM1026_PIN_IS_TDM2(sc->sc_cfg[0])) 373 continue; 374 sc->sc_sensor[ADM1026_TEMP_NUM(i)].units = ENVSYS_STEMP; 375 sc->sc_sensor[ADM1026_TEMP_NUM(i)].state = ENVSYS_SINVALID; 376 sc->sc_ntemps++; 377 if (sysmon_envsys_sensor_attach( 378 sc->sc_sme, &sc->sc_sensor[ADM1026_TEMP_NUM(i)])) { 379 sysmon_envsys_destroy(sc->sc_sme); 380 aprint_error_dev(sc->sc_dev, 381 "unable to attach temp %d at sysmon\n", i); 382 return; 383 } 384 } 385 } 386 387 static void 388 adm1026_setup_volts(struct adm1026_softc *sc) 389 { 390 int i; 391 392 for (i = 0; i < ADM1026_MAX_VOLTS; i++) { 393 /* Check configuration1 register to see if TDM2 is configured */ 394 if (adm1026_volts_table[i].check_tdm2 && 395 ADM1026_PIN_IS_TDM2(sc->sc_cfg[0])) 396 continue; 397 strlcpy(sc->sc_sensor[ADM1026_VOLT_NUM(i)].desc, 398 adm1026_volts_table[i].desc, 399 sizeof(sc->sc_sensor[ADM1026_VOLT_NUM(i)].desc)); 400 sc->sc_sensor[ADM1026_VOLT_NUM(i)].units = ENVSYS_SVOLTS_DC; 401 sc->sc_sensor[ADM1026_VOLT_NUM(i)].state = ENVSYS_SINVALID; 402 if (sysmon_envsys_sensor_attach( 403 sc->sc_sme, &sc->sc_sensor[ADM1026_VOLT_NUM(i)])) { 404 sysmon_envsys_destroy(sc->sc_sme); 405 aprint_error_dev(sc->sc_dev, 406 "unable to attach volts %d at sysmon\n", i); 407 return; 408 } 409 } 410 } 411 412 void 413 adm1026_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 414 { 415 struct adm1026_softc *sc = sme->sme_cookie; 416 417 if (edata->sensor < sc->sc_nfans) 418 adm1026_read_fan(sc, edata); 419 else if (edata->sensor < sc->sc_nfans + sc->sc_ntemps) 420 adm1026_read_temp(sc, edata); 421 else 422 adm1026_read_volt(sc, edata); 423 } 424 425 static void 426 adm1026_read_fan(struct adm1026_softc *sc, envsys_data_t *edata) 427 { 428 int fan = ADM1026_NUM_FAN(edata->sensor); 429 int err; 430 uint8_t val; 431 432 if ((err = adm1026_read_reg(sc, ADM1026_FAN_VAL(fan), &val)) != 0) { 433 edata->state = ENVSYS_SINVALID; 434 return; 435 } 436 if (val == 0xff || val == 0x00) /* Fan missing or stopped */ 437 edata->value_cur = 0; 438 else 439 edata->value_cur = 1350000 / (val * sc->sc_fandiv[fan]); 440 edata->state = ENVSYS_SVALID; 441 } 442 443 static void 444 adm1026_read_temp(struct adm1026_softc *sc, envsys_data_t *edata) 445 { 446 int temp = ADM1026_NUM_TEMP(edata->sensor); 447 int err; 448 uint8_t val; 449 450 if (temp == 0) 451 err = adm1026_read_reg(sc, ADM1026_INT_TEMP_VAL, &val); 452 else if (temp == 1) 453 err = adm1026_read_reg(sc, ADM1026_TDM1_VAL, &val); 454 else 455 err = adm1026_read_reg(sc, ADM1026_TDM2_AIN9_VAL, &val); 456 if (err) { 457 edata->state = ENVSYS_SINVALID; 458 return; 459 } 460 461 if (val & 0x80) /* Negative temperature */ 462 edata->value_cur = 273150000 - sc->sc_temp_off[temp] - 463 1000000 * (val & 0x7f); 464 else /* Positive temperature */ 465 edata->value_cur = 273150000 - sc->sc_temp_off[temp] + 466 1000000 * val; 467 edata->state = ENVSYS_SVALID; 468 } 469 470 static void 471 adm1026_read_volt(struct adm1026_softc *sc, envsys_data_t *edata) 472 { 473 int volt = ADM1026_NUM_VOLT(edata->sensor); 474 int err; 475 uint8_t val; 476 477 err = adm1026_read_reg(sc, adm1026_volts_table[volt].reg, &val); 478 if (err) { 479 edata->state = ENVSYS_SINVALID; 480 return; 481 } 482 /* Vbatt is not valid for < 1.5V */ 483 if (volt == 0 && val < 0x60) 484 edata->state = ENVSYS_SINVALID; 485 edata->value_cur = (int) val * adm1026_volts_table[volt].incr; 486 edata->state = ENVSYS_SVALID; 487 } 488 489 static int 490 adm1026_read_reg_int(i2c_tag_t tag, i2c_addr_t addr, uint8_t reg, 491 bool multi_read, uint8_t *val) 492 { 493 #define ADM1026_READ_RETRIES 5 494 int i, j, err = 0; 495 uint8_t creg, cval, tmp[ADM1026_READ_RETRIES + 1]; 496 497 if ((err = iic_acquire_bus(tag, 0)) != 0) 498 return err; 499 /* Standard ADM1026 */ 500 if (multi_read == false) { 501 err = iic_exec(tag, I2C_OP_READ_WITH_STOP, 502 addr, ®, 1, val, 1, 0); 503 /* 504 * The ADM1026 found in some Sun machines sometimes reads bogus values. 505 * We'll read at least twice and check that we get (nearly) the same 506 * value. If not, we'll read another register and then re-read the 507 * first. 508 */ 509 } else { 510 if (reg == ADM1026_CONF1) 511 creg = ADM1026_CONF2; 512 else 513 creg = ADM1026_CONF1; 514 if ((err = iic_exec(tag, I2C_OP_READ_WITH_STOP, 515 addr, ®, 1, &tmp[0], 1, 0)) != 0) { 516 iic_release_bus(tag, 0); 517 return err; 518 } 519 for (i = 1; i <= ADM1026_READ_RETRIES; i++) { 520 if ((err = iic_exec(tag, I2C_OP_READ_WITH_STOP, 521 addr, ®, 1, &tmp[i], 1, 0)) != 0) 522 break; 523 for (j = 0; j < i; j++) 524 if (abs(tmp[j] - tmp[i]) < 3) { 525 *val = tmp[i]; 526 iic_release_bus(tag, 0); 527 return 0; 528 } 529 if ((err = iic_exec(tag, I2C_OP_READ_WITH_STOP, 530 addr, &creg, 1, &cval, 1, 0)) != 0) 531 break; 532 err = -1; /* Return error if we don't match. */ 533 } 534 } 535 iic_release_bus(tag, 0); 536 return err; 537 } 538 539 static int 540 adm1026_write_reg(struct adm1026_softc *sc, uint8_t reg, uint8_t val) 541 { 542 int err = 0; 543 544 if ((err = iic_acquire_bus(sc->sc_tag, 0)) != 0) 545 return err; 546 err = iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address, 547 ®, 1, &val, 1, 0); 548 iic_release_bus(sc->sc_tag, 0); 549 return err; 550 } 551
Indexes created Mon Sep 22 05:09:51 GMT 2025