adm1026.c revision 1.5.2.1
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 1.5.2.1 2020/04/08 14:08:05 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(struct adm1026_softc *, int); 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(struct adm1026_softc *sc, 117 uint8_t reg, uint8_t *val); 118 static int adm1026_write_reg(struct adm1026_softc *sc, 119 uint8_t reg, uint8_t val); 120 121 CFATTACH_DECL_NEW(adm1026hm, sizeof(struct adm1026_softc), 122 adm1026_match, adm1026_attach, adm1026_detach, NULL); 123 124 static const struct device_compatible_entry compat_data[] = { 125 { "i2c-adm1026", 0 }, 126 { NULL, 0 } 127 }; 128 129 static int 130 adm1026_match(device_t parent, cfdata_t cf, void *aux) 131 { 132 struct i2c_attach_args *ia = aux; 133 struct adm1026_softc sc; /* For chip ident */ 134 int match_result; 135 136 sc.sc_tag = ia->ia_tag; 137 sc.sc_address = ia->ia_addr; 138 139 if (iic_use_direct_match(ia, cf, compat_data, &match_result)) 140 return match_result; 141 142 if (ia->ia_addr == ADM1026_ADDR1 && adm1026_ident(&sc, 1)) 143 return I2C_MATCH_ADDRESS_AND_PROBE; 144 145 return 0; 146 } 147 148 static int 149 adm1026_ident(struct adm1026_softc *sc, int probe_only) 150 { 151 uint8_t val; 152 int err; 153 154 /* Manufacturer ID and revision/stepping */ 155 err = adm1026_read_reg(sc, ADM1026_ID, &val); 156 if (err || val != ADM1026_MANF_ID) { 157 if (!probe_only) 158 aprint_verbose("adm1026_ident: " 159 "manufacturer ID invalid or missing\n"); 160 return 0; 161 } 162 err = adm1026_read_reg(sc, ADM1026_REV, &sc->sc_rev); 163 if (err || ADM1026_REVISION(sc->sc_rev) != ADM1026_MANF_REV) { 164 if (!probe_only) 165 aprint_verbose("adm1026_ident: " 166 "manufacturer revision invalid or missing\n"); 167 return 0; 168 } 169 return 1; 170 } 171 172 static void 173 adm1026_attach(device_t parent, device_t self, void *aux) 174 { 175 struct adm1026_softc *sc = device_private(self); 176 struct i2c_attach_args *ia = aux; 177 prop_dictionary_t props = device_properties(self); 178 uint8_t val, fan_div2; 179 int err, div2_val; 180 181 sc->sc_tag = ia->ia_tag; 182 sc->sc_address = ia->ia_addr; 183 sc->sc_dev = self; 184 185 sc->sc_multi_read = false; 186 prop_dictionary_get_bool(props, "multi_read", &sc->sc_multi_read); 187 if (prop_dictionary_get_uint8(props, "fan_div2", &fan_div2) != 0) 188 div2_val = fan_div2; 189 else 190 div2_val = -1; 191 192 (void) adm1026_ident(sc, 0); 193 aprint_normal(": ADM1026 hardware monitor: rev. 0x%x, step. 0x%x\n", 194 ADM1026_REVISION(sc->sc_rev), ADM1026_STEPPING(sc->sc_rev)); 195 196 /* 197 * Start monitoring if not already monitoring. 198 * Wait 1.8s for the fan readings to stabilise. 199 */ 200 if ((err = adm1026_read_reg(sc, ADM1026_CONF1, &val)) != 0) { 201 aprint_error_dev(sc->sc_dev, ": unable to read conf1\n"); 202 return; 203 } 204 if (!(val & ADM1026_CONF1_MONITOR)) { 205 aprint_normal_dev(sc->sc_dev, 206 ": starting monitoring, waiting 1.8s for readings\n"); 207 val |= ADM1026_CONF1_MONITOR; 208 if ((err = adm1026_write_reg(sc, ADM1026_CONF1, val)) != 0) { 209 aprint_error_dev(sc->sc_dev, 210 ": unable to write conf1\n"); 211 return; 212 } 213 delay(1800000); 214 } 215 sc->sc_cfg[0] = val; 216 217 sc->sc_sme = sysmon_envsys_create(); 218 sc->sc_nfans = 0; 219 adm1026_setup_fans(sc, div2_val); 220 sc->sc_ntemps = 0; 221 adm1026_setup_temps(sc); 222 adm1026_setup_volts(sc); 223 aprint_normal_dev(self, "%d fans, %d temperatures, %d voltages\n", 224 sc->sc_nfans, sc->sc_ntemps, sc->sc_ntemps == 3 ? 15 : 17); 225 226 sc->sc_sme->sme_name = device_xname(self); 227 sc->sc_sme->sme_cookie = sc; 228 sc->sc_sme->sme_refresh = adm1026_refresh; 229 if (sysmon_envsys_register(sc->sc_sme)) { 230 aprint_error_dev(self, 231 "unable to register with sysmon\n"); 232 sysmon_envsys_destroy(sc->sc_sme); 233 return; 234 } 235 236 if (!pmf_device_register(self, adm1026_pmf_suspend, adm1026_pmf_resume)) 237 aprint_error_dev(self, "couldn't establish power handler\n"); 238 239 return; 240 } 241 242 /* 243 * We could stop (suspend/detach) and restart (resume) monitoring, 244 * but we don't do that because some machines have separate 245 * management hardware which can read the sensors. 246 */ 247 bool 248 adm1026_pmf_suspend(device_t dev, const pmf_qual_t *qual) 249 { 250 return true; 251 } 252 253 bool 254 adm1026_pmf_resume(device_t dev, const pmf_qual_t *qual) 255 { 256 return true; 257 } 258 259 static int 260 adm1026_detach(device_t self, int flags) 261 { 262 struct adm1026_softc *sc = device_private(self); 263 264 pmf_device_deregister(self); 265 266 sysmon_envsys_unregister(sc->sc_sme); 267 sc->sc_sme = NULL; 268 269 return 0; 270 } 271 272 static void 273 adm1026_setup_fans(struct adm1026_softc *sc, int div2_val) 274 { 275 int i, err = 0; 276 uint8_t div1, div2; 277 278 /* Read fan-related registers (configuration and divisors) */ 279 if ((err = adm1026_read_reg(sc, ADM1026_CONF2, &sc->sc_cfg[1])) != 0) { 280 aprint_error_dev(sc->sc_dev, "unable to read conf2\n"); 281 return; 282 } 283 if ((err = adm1026_read_reg(sc, ADM1026_FAN_DIV1, &div1)) != 0) { 284 aprint_error_dev(sc->sc_dev, "unable to read fan_div1\n"); 285 return; 286 } 287 sc->sc_fandiv[0] = 1 << ADM1026_FAN0_DIV(div1); 288 sc->sc_fandiv[1] = 1 << ADM1026_FAN1_DIV(div1); 289 sc->sc_fandiv[2] = 1 << ADM1026_FAN2_DIV(div1); 290 sc->sc_fandiv[3] = 1 << ADM1026_FAN3_DIV(div1); 291 if (div2_val < 0) { 292 if ((err = 293 adm1026_read_reg(sc, ADM1026_FAN_DIV2, &div2)) != 0) { 294 aprint_error_dev(sc->sc_dev, 295 "unable to read fan_div2\n"); 296 return; 297 } 298 } else 299 div2 = div2_val; 300 sc->sc_fandiv[4] = 1 << ADM1026_FAN4_DIV(div2); 301 sc->sc_fandiv[5] = 1 << ADM1026_FAN5_DIV(div2); 302 sc->sc_fandiv[6] = 1 << ADM1026_FAN6_DIV(div2); 303 sc->sc_fandiv[7] = 1 << ADM1026_FAN7_DIV(div2); 304 305 for (i = 0; i < ADM1026_MAX_FANS; i++) { 306 sc->sc_sensor[ADM1026_FAN_NUM(i)].state = ENVSYS_SINVALID; 307 /* Check configuration2 register to see which pins are fans. */ 308 if (ADM1026_PIN_IS_FAN(sc->sc_cfg[1], i)) { 309 sc->sc_sensor[ADM1026_FAN_NUM(i)].units = 310 ENVSYS_SFANRPM; 311 snprintf(sc->sc_sensor[ADM1026_FAN_NUM(i)].desc, 312 sizeof(sc->sc_sensor[ADM1026_FAN_NUM(i)].desc), 313 "fan %d", ADM1026_FAN_NUM(i)); 314 sc->sc_nfans++; 315 if (sysmon_envsys_sensor_attach( 316 sc->sc_sme, &sc->sc_sensor[ADM1026_FAN_NUM(i)])) { 317 sysmon_envsys_destroy(sc->sc_sme); 318 aprint_error_dev(sc->sc_dev, 319 "unable to attach fan %d at sysmon\n", i); 320 return; 321 } 322 } 323 } 324 } 325 326 static void 327 adm1026_setup_temps(struct adm1026_softc *sc) 328 { 329 int i; 330 uint8_t val; 331 332 /* Temperature offsets */ 333 if (adm1026_read_reg(sc, ADM1026_INT_TEMP_OFF, &val) 334 != 0) { 335 aprint_error_dev(sc->sc_dev, "unable to read int temp. off.\n"); 336 return; 337 } 338 if (val & 0x80) 339 sc->sc_temp_off[0] = 0 - 1000000 * (val & 0x7f); 340 else 341 sc->sc_temp_off[0] = 1000000 * (val & 0x7f); 342 if (adm1026_read_reg(sc, ADM1026_TDM1_OFF, &val) != 0) { 343 aprint_error_dev(sc->sc_dev, "unable to read tdm1 off.\n"); 344 return; 345 } 346 if (val & 0x80) 347 sc->sc_temp_off[1] = 0 - 1000000 * (val & 0x7f); 348 else 349 sc->sc_temp_off[1] = 1000000 * (val & 0x7f); 350 if (adm1026_read_reg(sc, ADM1026_TDM2_OFF, &val) != 0) { 351 aprint_error_dev(sc->sc_dev, "unable to read tdm2 off.\n"); 352 return; 353 } 354 if (val & 0x80) 355 sc->sc_temp_off[2] = 0 - 1000000 * (val & 0x7f); 356 else 357 sc->sc_temp_off[2] = 1000000 * (val & 0x7f); 358 359 strlcpy(sc->sc_sensor[ADM1026_TEMP_NUM(0)].desc, "internal", 360 sizeof(sc->sc_sensor[ADM1026_TEMP_NUM(0)].desc)); 361 strlcpy(sc->sc_sensor[ADM1026_TEMP_NUM(1)].desc, "external 1", 362 sizeof(sc->sc_sensor[ADM1026_TEMP_NUM(1)].desc)); 363 strlcpy(sc->sc_sensor[ADM1026_TEMP_NUM(2)].desc, "external 2", 364 sizeof(sc->sc_sensor[ADM1026_TEMP_NUM(2)].desc)); 365 for (i = 0; i < ADM1026_MAX_TEMPS; i++) { 366 /* Check configuration1 register to see if TDM2 is configured */ 367 if (i == 2 && !ADM1026_PIN_IS_TDM2(sc->sc_cfg[0])) 368 continue; 369 sc->sc_sensor[ADM1026_TEMP_NUM(i)].units = ENVSYS_STEMP; 370 sc->sc_sensor[ADM1026_TEMP_NUM(i)].state = ENVSYS_SINVALID; 371 sc->sc_ntemps++; 372 if (sysmon_envsys_sensor_attach( 373 sc->sc_sme, &sc->sc_sensor[ADM1026_TEMP_NUM(i)])) { 374 sysmon_envsys_destroy(sc->sc_sme); 375 aprint_error_dev(sc->sc_dev, 376 "unable to attach temp %d at sysmon\n", i); 377 return; 378 } 379 } 380 } 381 382 static void 383 adm1026_setup_volts(struct adm1026_softc *sc) 384 { 385 int i; 386 387 for (i = 0; i < ADM1026_MAX_VOLTS; i++) { 388 /* Check configuration1 register to see if TDM2 is configured */ 389 if (adm1026_volts_table[i].check_tdm2 && 390 ADM1026_PIN_IS_TDM2(sc->sc_cfg[0])) 391 continue; 392 strlcpy(sc->sc_sensor[ADM1026_VOLT_NUM(i)].desc, 393 adm1026_volts_table[i].desc, 394 sizeof(sc->sc_sensor[ADM1026_VOLT_NUM(i)].desc)); 395 sc->sc_sensor[ADM1026_VOLT_NUM(i)].units = ENVSYS_SVOLTS_DC; 396 sc->sc_sensor[ADM1026_VOLT_NUM(i)].state = ENVSYS_SINVALID; 397 if (sysmon_envsys_sensor_attach( 398 sc->sc_sme, &sc->sc_sensor[ADM1026_VOLT_NUM(i)])) { 399 sysmon_envsys_destroy(sc->sc_sme); 400 aprint_error_dev(sc->sc_dev, 401 "unable to attach volts %d at sysmon\n", i); 402 return; 403 } 404 } 405 } 406 407 void 408 adm1026_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 409 { 410 struct adm1026_softc *sc = sme->sme_cookie; 411 412 if (edata->sensor < sc->sc_nfans) 413 adm1026_read_fan(sc, edata); 414 else if (edata->sensor < sc->sc_nfans + sc->sc_ntemps) 415 adm1026_read_temp(sc, edata); 416 else 417 adm1026_read_volt(sc, edata); 418 } 419 420 static void 421 adm1026_read_fan(struct adm1026_softc *sc, envsys_data_t *edata) 422 { 423 int fan = ADM1026_NUM_FAN(edata->sensor); 424 int err; 425 uint8_t val; 426 427 if ((err = adm1026_read_reg(sc, ADM1026_FAN_VAL(fan), &val)) != 0) { 428 edata->state = ENVSYS_SINVALID; 429 return; 430 } 431 if (val == 0xff || val == 0x00) /* Fan missing or stopped */ 432 edata->value_cur = 0; 433 else 434 edata->value_cur = 1350000 / (val * sc->sc_fandiv[fan]); 435 edata->state = ENVSYS_SVALID; 436 } 437 438 static void 439 adm1026_read_temp(struct adm1026_softc *sc, envsys_data_t *edata) 440 { 441 int temp = ADM1026_NUM_TEMP(edata->sensor); 442 int err; 443 uint8_t val; 444 445 if (temp == 0) 446 err = adm1026_read_reg(sc, ADM1026_INT_TEMP_VAL, &val); 447 else if (temp == 1) 448 err = adm1026_read_reg(sc, ADM1026_TDM1_VAL, &val); 449 else 450 err = adm1026_read_reg(sc, ADM1026_TDM2_AIN9_VAL, &val); 451 if (err) { 452 edata->state = ENVSYS_SINVALID; 453 return; 454 } 455 456 if (val & 0x80) /* Negative temperature */ 457 edata->value_cur = 273150000 - sc->sc_temp_off[temp] - 458 1000000 * (val & 0x7f); 459 else /* Positive temperature */ 460 edata->value_cur = 273150000 - sc->sc_temp_off[temp] + 461 1000000 * val; 462 edata->state = ENVSYS_SVALID; 463 } 464 465 static void 466 adm1026_read_volt(struct adm1026_softc *sc, envsys_data_t *edata) 467 { 468 int volt = ADM1026_NUM_VOLT(edata->sensor); 469 int err; 470 uint8_t val; 471 472 err = adm1026_read_reg(sc, adm1026_volts_table[volt].reg, &val); 473 if (err) { 474 edata->state = ENVSYS_SINVALID; 475 return; 476 } 477 /* Vbatt is not valid for < 1.5V */ 478 if (volt == 0 && val < 0x60) 479 edata->state = ENVSYS_SINVALID; 480 edata->value_cur = (int) val * adm1026_volts_table[volt].incr; 481 edata->state = ENVSYS_SVALID; 482 } 483 484 static int 485 adm1026_read_reg(struct adm1026_softc *sc, uint8_t reg, uint8_t *val) 486 { 487 #define ADM1026_READ_RETRIES 5 488 int i, j, err = 0; 489 uint8_t creg, cval, tmp[ADM1026_READ_RETRIES + 1]; 490 491 if ((err = iic_acquire_bus(sc->sc_tag, 0)) != 0) 492 return err; 493 /* Standard ADM1026 */ 494 if (sc->sc_multi_read == false) { 495 err = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 496 sc->sc_address, ®, 1, val, 1, 0); 497 /* 498 * The ADM1026 found in some Sun machines sometimes reads bogus values. 499 * We'll read at least twice and check that we get (nearly) the same 500 * value. If not, we'll read another register and then re-read the 501 * first. 502 */ 503 } else { 504 if (reg == ADM1026_CONF1) 505 creg = ADM1026_CONF2; 506 else 507 creg = ADM1026_CONF1; 508 if ((err = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 509 sc->sc_address, ®, 1, &tmp[0], 1, 0)) != 0) { 510 iic_release_bus(sc->sc_tag, 0); 511 return err; 512 } 513 for (i = 1; i <= ADM1026_READ_RETRIES; i++) { 514 if ((err = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 515 sc->sc_address, ®, 1, &tmp[i], 1, 0)) != 0) 516 break; 517 for (j = 0; j < i; j++) 518 if (abs(tmp[j] - tmp[i]) < 3) { 519 *val = tmp[i]; 520 iic_release_bus(sc->sc_tag, 0); 521 return 0; 522 } 523 if ((err = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 524 sc->sc_address, &creg, 1, &cval, 1, 0)) != 0) 525 break; 526 err = -1; /* Return error if we don't match. */ 527 } 528 } 529 iic_release_bus(sc->sc_tag, 0); 530 return err; 531 } 532 533 static int 534 adm1026_write_reg(struct adm1026_softc *sc, uint8_t reg, uint8_t val) 535 { 536 int err = 0; 537 538 if ((err = iic_acquire_bus(sc->sc_tag, 0)) != 0) 539 return err; 540 err = iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address, 541 ®, 1, &val, 1, 0); 542 iic_release_bus(sc->sc_tag, 0); 543 return err; 544 } 545
Indexes created Thu Oct 23 22:10:10 GMT 2025