sdtemp.c revision 1.1
1 /* $NetBSD: sdtemp.c,v 1.1 2009/05/09 15:04:25 pgoyette Exp $ */ 2 3 /* 4 * Copyright (c) 2009 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Paul Goyette. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: sdtemp.c,v 1.1 2009/05/09 15:04:25 pgoyette Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kmem.h> 38 #include <sys/device.h> 39 #include <sys/kernel.h> 40 #include <sys/endian.h> 41 #include <sys/sysctl.h> 42 43 #include <dev/sysmon/sysmonvar.h> 44 45 #include <dev/i2c/i2cvar.h> 46 #include <dev/i2c/sdtemp_reg.h> 47 48 struct sdtemp_softc { 49 device_t sc_dev; 50 i2c_tag_t sc_tag; 51 int sc_address; 52 53 struct sysmon_envsys *sc_sme; 54 envsys_data_t *sc_sensor; 55 int sc_resolution; 56 uint16_t sc_capability; 57 uint16_t sc_low_lim, sc_high_lim, sc_crit_lim; 58 }; 59 60 static int sdtemp_match(device_t, cfdata_t, void *); 61 static void sdtemp_attach(device_t, device_t, void *); 62 63 CFATTACH_DECL_NEW(sdtemp, sizeof(struct sdtemp_softc), 64 sdtemp_match, sdtemp_attach, NULL, NULL); 65 66 static void sdtemp_refresh(struct sysmon_envsys *, envsys_data_t *); 67 #ifdef NOT_YET 68 static int sdtemp_read_8(struct sdtemp_softc *, uint8_t, uint8_t *); 69 static int sdtemp_write_8(struct sdtemp_softc *, uint8_t, uint8_t); 70 #endif /* NOT YET */ 71 static int sdtemp_read_16(struct sdtemp_softc *, uint8_t, uint16_t *); 72 static int sdtemp_write_16(struct sdtemp_softc *, uint8_t, uint16_t); 73 static uint32_t sdtemp_decode_temp(struct sdtemp_softc *, uint16_t); 74 static void sdtemp_set_thresh(struct sdtemp_softc *, int, uint16_t); 75 static bool sdtemp_pmf_suspend(device_t PMF_FN_PROTO); 76 static bool sdtemp_pmf_resume(device_t PMF_FN_PROTO); 77 78 SYSCTL_SETUP_PROTO(sysctl_sdtemp_setup); 79 static int sdtemp_sysctl_helper(SYSCTLFN_PROTO); 80 81 struct sdtemp_dev_entry { 82 const uint16_t sdtemp_mfg_id; 83 const uint8_t sdtemp_dev_id; 84 const uint8_t sdtemp_rev_id; 85 const uint8_t sdtemp_resolution; 86 const char *sdtemp_desc; 87 }; 88 89 /* sysctl stuff */ 90 static int hw_node = CTL_EOL; 91 92 /* 93 * List of devices known to conform to JEDEC JC42.4 94 * 95 * NOTE: A non-negative value for resolution indicates that the sensor 96 * resolution is fixed at that number of fractional bits; a negative 97 * value indicates that the sensor needs to be configured. In either 98 * case, trip-point registers are fixed at two-bit (0.25C) resolution. 99 */ 100 static const struct sdtemp_dev_entry 101 sdtemp_dev_table[] = { 102 { MAXIM_MANUFACTURER_ID, MAX_6604_DEVICE_ID, 0xff, 3, 103 "Maxim MAX604" }, 104 { MCP_MANUFACTURER_ID, MCP_9805_DEVICE_ID, 0xff, 2, 105 "Microchip Tech MCP9805" }, 106 { MCP_MANUFACTURER_ID, MCP_98242_DEVICE_ID, 0xff, -4, 107 "Microchip Tech MCP98242" }, 108 { ADT_MANUFACTURER_ID, ADT_7408_DEVICE_ID, 0xff, 4, 109 "Analog Devices ADT7408" }, 110 { NXP_MANUFACTURER_ID, NXP_SE97_DEVICE_ID, 0xff, 3, 111 "NXP Semiconductors SE97/SE98" }, 112 { STTS_MANUFACTURER_ID, STTS_424E02_DEVICE_ID, 0x00, 2, 113 "STmicroelectronics STTS424E02-DA" }, 114 { STTS_MANUFACTURER_ID, STTS_424E02_DEVICE_ID, 0x01, 2, 115 "STmicroelectronics STTS424E02-DN" }, 116 { CAT_MANUFACTURER_ID, CAT_34TS02_DEVICE_ID, 0xff, 4, 117 "Catalyst CAT34TS02/CAT6095" }, 118 { 0, 0, 0, 2, "Unknown" } 119 }; 120 121 static int 122 sdtemp_lookup(uint16_t mfg, uint16_t dev, uint16_t rev) 123 { 124 int i; 125 126 for (i = 0; sdtemp_dev_table[i].sdtemp_mfg_id; i++) 127 if (sdtemp_dev_table[i].sdtemp_mfg_id == mfg && 128 sdtemp_dev_table[i].sdtemp_dev_id == dev && 129 (sdtemp_dev_table[i].sdtemp_rev_id == 0xff || 130 sdtemp_dev_table[i].sdtemp_rev_id == rev)) 131 break; 132 133 return i; 134 } 135 136 static int 137 sdtemp_match(device_t parent, cfdata_t cf, void *aux) 138 { 139 struct i2c_attach_args *ia = aux; 140 uint16_t mfgid, devid; 141 struct sdtemp_softc sc; 142 int i, error; 143 144 sc.sc_tag = ia->ia_tag; 145 sc.sc_address = ia->ia_addr; 146 147 if ((ia->ia_addr & SDTEMP_ADDRMASK) != SDTEMP_ADDR) 148 return 0; 149 150 /* Verify that we can read the manufacturer ID & Device ID */ 151 iic_acquire_bus(sc.sc_tag, 0); 152 error = sdtemp_read_16(&sc, SDTEMP_REG_MFG_ID, &mfgid) | 153 sdtemp_read_16(&sc, SDTEMP_REG_DEV_REV, &devid); 154 iic_release_bus(sc.sc_tag, 0); 155 156 if (error) 157 return 0; 158 159 i = sdtemp_lookup(mfgid, devid >> 8, devid & 0xff); 160 if (sdtemp_dev_table[i].sdtemp_mfg_id == 0) { 161 aprint_debug("sdtemp: No match for mfg 0x%04x dev 0x%02x " 162 "rev 0x%02x at address 0x%02x\n", mfgid, devid >> 8, 163 devid & 0xff, sc.sc_address); 164 return 0; 165 } 166 167 return 1; 168 } 169 170 static void 171 sdtemp_attach(device_t parent, device_t self, void *aux) 172 { 173 struct sdtemp_softc *sc = device_private(self); 174 struct i2c_attach_args *ia = aux; 175 const struct sysctlnode *node = NULL; 176 uint16_t mfgid, devid; 177 int32_t dev_sysctl_num; 178 int i, error; 179 180 sc->sc_tag = ia->ia_tag; 181 sc->sc_address = ia->ia_addr; 182 sc->sc_dev = self; 183 184 iic_acquire_bus(sc->sc_tag, 0); 185 if ((error = sdtemp_read_16(sc, SDTEMP_REG_MFG_ID, &mfgid)) != 0 || 186 (error = sdtemp_read_16(sc, SDTEMP_REG_DEV_REV, &devid)) != 0) { 187 iic_release_bus(sc->sc_tag, I2C_F_POLL); 188 aprint_error(": attach error %d\n", error); 189 return; 190 } 191 i = sdtemp_lookup(mfgid, devid >> 8, devid & 0xff); 192 sc->sc_resolution = 193 sdtemp_dev_table[i].sdtemp_resolution; 194 195 aprint_naive(": Temp Sensor\n"); 196 aprint_normal(": %s Temp Sensor\n", sdtemp_dev_table[i].sdtemp_desc); 197 198 if (sdtemp_dev_table[i].sdtemp_mfg_id == 0) 199 aprint_debug_dev(self, 200 "mfg 0x%04x dev 0x%02x rev 0x%02x at addr 0x%02x\n", 201 mfgid, devid >> 8, devid & 0xff, ia->ia_addr); 202 203 /* 204 * Alarm capability is required; if not present, this is likely 205 * not a real sdtemp device. 206 */ 207 error = sdtemp_read_16(sc, SDTEMP_REG_CAPABILITY, &sc->sc_capability); 208 if (error != 0 || (sc->sc_capability & SDTEMP_CAP_HAS_ALARM) == 0) { 209 iic_release_bus(sc->sc_tag, 0); 210 aprint_error_dev(self, 211 "required alarm capability not present!\n"); 212 return; 213 } 214 /* Set the configuration to defaults. */ 215 error = sdtemp_write_16(sc, SDTEMP_REG_CONFIG, 0); 216 if (error != 0) { 217 iic_release_bus(sc->sc_tag, 0); 218 aprint_error_dev(self, "error %d writing config register\n", 219 error); 220 return; 221 } 222 /* If variable resolution, set to max */ 223 if (sc->sc_resolution < 0) { 224 sc->sc_resolution = ~sc->sc_resolution; 225 error = sdtemp_write_16(sc, SDTEMP_REG_RESOLUTION, 226 sc->sc_resolution & 0x3); 227 if (error != 0) { 228 iic_release_bus(sc->sc_tag, 0); 229 aprint_error_dev(self, 230 "error %d writing resolution register\n", error); 231 return; 232 } else 233 sc->sc_resolution++; 234 } 235 iic_release_bus(sc->sc_tag, 0); 236 237 /* Hook us into the sysmon_envsys subsystem */ 238 sc->sc_sme = sysmon_envsys_create(); 239 sc->sc_sensor = kmem_zalloc(sizeof(envsys_data_t), KM_NOSLEEP); 240 if (!sc->sc_sensor) { 241 aprint_error_dev(self, "unable to allocate sc_sensor\n"); 242 goto bad2; 243 } 244 245 /* Initialize sensor data. */ 246 sc->sc_sensor->units = ENVSYS_STEMP; 247 sc->sc_sensor->state = ENVSYS_SINVALID; 248 #ifdef ENVSYS_FMONLIMITS 249 sc->sc_sensor->flags |= ENVSYS_FMONLIMITS; 250 #else 251 sc->sc_sensor->flags |= ENVSYS_FMONWARNOVER | ENVSYS_FMONWARNUNDER | 252 ENVSYS_FMONCRITOVER; 253 #endif 254 (void)strlcpy(sc->sc_sensor->desc, device_xname(self), 255 sizeof(sc->sc_sensor->desc)); 256 257 /* Now attach the sensor */ 258 if (sysmon_envsys_sensor_attach(sc->sc_sme, sc->sc_sensor)) { 259 aprint_error_dev(self, "unable to attach sensor\n"); 260 goto bad; 261 } 262 263 /* Register the device */ 264 sc->sc_sme->sme_name = device_xname(self); 265 sc->sc_sme->sme_cookie = sc; 266 sc->sc_sme->sme_refresh = sdtemp_refresh; 267 268 error = sysmon_envsys_register(sc->sc_sme); 269 if (error) { 270 aprint_error_dev(self, "error %d registering with sysmon\n", 271 error); 272 goto bad; 273 } 274 275 if (!pmf_device_register(self, sdtemp_pmf_suspend, sdtemp_pmf_resume)) 276 aprint_error_dev(self, "couldn't establish power handler\n"); 277 278 279 /* Retrieve and display hardware monitor limits */ 280 i = 0; 281 aprint_normal_dev(self, ""); 282 iic_acquire_bus(sc->sc_tag, 0); 283 if (sdtemp_read_16(sc, SDTEMP_REG_LOWER_LIM, &sc->sc_low_lim) == 0 && 284 sc->sc_low_lim != 0) { 285 aprint_normal("low limit %d ", sc->sc_low_lim); 286 i++; 287 } 288 if (sdtemp_read_16(sc, SDTEMP_REG_UPPER_LIM, &sc->sc_high_lim) == 0 && 289 sc->sc_high_lim != 0) { 290 aprint_normal("high limit %d ", sc->sc_high_lim); 291 i++; 292 } 293 if (sdtemp_read_16(sc, SDTEMP_REG_CRIT_LIM, &sc->sc_crit_lim) == 0 && 294 sc->sc_crit_lim != 0) { 295 aprint_normal("critical limit %d ", sc->sc_crit_lim); 296 i++; 297 } 298 iic_release_bus(sc->sc_tag, 0); 299 if (i == 0) 300 aprint_normal("no hardware limits set\n"); 301 else 302 aprint_normal("\n"); 303 304 /* Create our sysctl tree. We just store the softc pointer for 305 * now; the sysctl_helper function will take care of creating 306 * a real string on the fly. We explicitly specify the new nodes' 307 * sysctl_num in order to identify the specific limit rather than 308 * using CTL_CREATE; this is OK since we're the only place that 309 * touches the sysctl tree for the device. 310 */ 311 312 if (hw_node != CTL_EOL) 313 sysctl_createv(NULL, 0, NULL, &node, 0, 314 CTLTYPE_NODE, device_xname(self), 315 NULL, NULL, 0, NULL, 0, 316 CTL_HW, CTL_CREATE, CTL_EOL); 317 if (node != NULL) { 318 dev_sysctl_num = node->sysctl_num; 319 sysctl_createv(NULL, 0, NULL, &node, 0, 320 CTLTYPE_NODE, "limits", 321 SYSCTL_DESCR("temperature limits"), 322 NULL, 0, NULL, 0, 323 CTL_HW, node->sysctl_num, CTL_CREATE, CTL_EOL); 324 } 325 if (node != NULL) { 326 sysctl_createv(NULL, 0, NULL, NULL, CTLFLAG_READWRITE, 327 CTLTYPE_INT, "low_limit", 328 SYSCTL_DESCR("alarm window lower limit"), 329 sdtemp_sysctl_helper, 0, sc, sizeof(int), 330 CTL_HW, dev_sysctl_num, node->sysctl_num, 331 SDTEMP_REG_LOWER_LIM, CTL_EOL); 332 sysctl_createv(NULL, 0, NULL, NULL, CTLFLAG_READWRITE, 333 CTLTYPE_INT, "high_limit", 334 SYSCTL_DESCR("alarm window upper limit"), 335 sdtemp_sysctl_helper, 0, sc, sizeof(int), 336 CTL_HW, dev_sysctl_num, node->sysctl_num, 337 SDTEMP_REG_UPPER_LIM, CTL_EOL); 338 sysctl_createv(NULL, 0, NULL, NULL, CTLFLAG_READWRITE, 339 CTLTYPE_INT, "crit_limit", 340 SYSCTL_DESCR("critical alarm limit"), 341 sdtemp_sysctl_helper, 0, sc, sizeof(int), 342 CTL_HW, dev_sysctl_num, node->sysctl_num, 343 SDTEMP_REG_CRIT_LIM, CTL_EOL); 344 } 345 return; 346 347 bad: 348 kmem_free(sc->sc_sensor, sizeof(envsys_data_t)); 349 bad2: 350 sysmon_envsys_destroy(sc->sc_sme); 351 } 352 353 /* Set up the threshold registers */ 354 static void 355 sdtemp_set_thresh(struct sdtemp_softc *sc, int reg, uint16_t val) 356 { 357 int error; 358 uint16_t *valp; 359 360 switch (reg) { 361 case SDTEMP_REG_LOWER_LIM: 362 valp = &sc->sc_low_lim; 363 break; 364 case SDTEMP_REG_UPPER_LIM: 365 valp = &sc->sc_high_lim; 366 break; 367 case SDTEMP_REG_CRIT_LIM: 368 valp = &sc->sc_crit_lim; 369 break; 370 default: 371 return; 372 } 373 374 iic_acquire_bus(sc->sc_tag, 0); 375 error = sdtemp_write_16(sc, reg, (val << 4) & SDTEMP_TEMP_MASK); 376 iic_release_bus(sc->sc_tag, 0); 377 378 if (error == 0) 379 *valp = val; 380 } 381 382 #ifdef NOT_YET /* All registers on these sensors are 16-bits */ 383 384 /* Read a 8-bit value from a register */ 385 static int 386 sdtemp_read_8(struct sdtemp_softc *sc, uint8_t reg, uint8_t *valp) 387 { 388 int error; 389 390 error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 391 sc->sc_address, ®, 1, valp, sizeof(*valp), 0); 392 393 return error; 394 } 395 396 static int 397 sdtemp_write_8(struct sdtemp_softc *sc, uint8_t reg, uint8_t val) 398 { 399 return iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 400 sc->sc_address, ®, 1, &val, sizeof(val), 0); 401 } 402 #endif /* NOT_YET */ 403 404 /* Read a 16-bit value from a register */ 405 static int 406 sdtemp_read_16(struct sdtemp_softc *sc, uint8_t reg, uint16_t *valp) 407 { 408 int error; 409 410 error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 411 sc->sc_address, ®, 1, valp, sizeof(*valp), 0); 412 if (error) 413 return error; 414 415 *valp = be16toh(*valp); 416 417 return 0; 418 } 419 420 static int 421 sdtemp_write_16(struct sdtemp_softc *sc, uint8_t reg, uint16_t val) 422 { 423 uint16_t temp; 424 425 temp = htobe16(val); 426 return iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 427 sc->sc_address, ®, 1, &temp, sizeof(temp), 0); 428 } 429 430 static uint32_t 431 sdtemp_decode_temp(struct sdtemp_softc *sc, uint16_t temp) 432 { 433 uint32_t val; 434 int32_t stemp; 435 436 /* Get only the temperature bits */ 437 temp &= SDTEMP_TEMP_MASK; 438 439 /* If necessary, extend the sign bit */ 440 if ((sc->sc_capability & SDTEMP_CAP_WIDER_RANGE) && 441 (temp & SDTEMP_TEMP_NEGATIVE)) 442 temp |= SDTEMP_TEMP_SIGN_EXT; 443 444 /* Mask off only bits valid within current resolution */ 445 temp &= ~(0xf >> sc->sc_resolution); 446 447 /* Treat as signed and extend to 32-bits */ 448 stemp = (int16_t)temp; 449 450 /* Now convert from 0.0625 (1/16) deg C increments to microKelvins */ 451 val = (stemp * 62500) + 273150000; 452 453 return val; 454 } 455 456 static void 457 sdtemp_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 458 { 459 struct sdtemp_softc *sc = sme->sme_cookie; 460 uint16_t val; 461 int error; 462 463 iic_acquire_bus(sc->sc_tag, 0); 464 error = sdtemp_read_16(sc, SDTEMP_REG_AMBIENT_TEMP, &val); 465 iic_release_bus(sc->sc_tag, 0); 466 467 if (error) { 468 edata->state = ENVSYS_SINVALID; 469 return; 470 } 471 472 edata->value_cur = sdtemp_decode_temp(sc, val); 473 474 /* Now check for limits */ 475 if (val & SDTEMP_ABOVE_CRIT) 476 edata->state = ENVSYS_SCRITOVER; 477 else if (val & SDTEMP_ABOVE_UPPER) 478 edata->state = ENVSYS_SWARNOVER; 479 else if (val & SDTEMP_BELOW_LOWER) 480 edata->state = ENVSYS_SWARNUNDER; 481 else 482 edata->state = ENVSYS_SVALID; 483 } 484 485 SYSCTL_SETUP(sysctl_sdtemp_setup, "sysctl hw.sdtemp subtree setup") 486 { 487 const struct sysctlnode *node; 488 489 if (sysctl_createv(clog, 0, NULL, &node, 490 CTLFLAG_PERMANENT, 491 CTLTYPE_NODE, "hw", NULL, 492 NULL, 0, NULL, 0, 493 CTL_HW, CTL_EOL) != 0) 494 return; 495 496 hw_node = node->sysctl_num; 497 } 498 499 /* 500 * The sysctl node actually contains just a pointer to our softc. We 501 * extract the individual limits on the fly, and if necessary replace 502 * the value with the new value specified by the user. 503 * 504 * Inspired by similar code in sys/net/if_tap.c 505 */ 506 static int 507 sdtemp_sysctl_helper(SYSCTLFN_ARGS) 508 { 509 struct sdtemp_softc *sc; 510 struct sysctlnode node; 511 int error, reg; 512 uint16_t reg_value; 513 int lim_value; 514 515 node = *rnode; 516 sc = node.sysctl_data; 517 reg = node.sysctl_num; 518 519 iic_acquire_bus(sc->sc_tag, 0); 520 error = sdtemp_read_16(sc, reg, ®_value); 521 iic_release_bus(sc->sc_tag, 0); 522 523 #ifdef DEBUG 524 aprint_verbose_dev(sc->sc_dev, "(%s) sc %p reg %d val 0x%04x err %d\n", 525 __func__, sc, reg, reg_value, error); 526 #endif 527 528 if (error == 0) { 529 lim_value = reg_value >> 4; 530 node.sysctl_data = &lim_value; 531 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 532 } 533 if (error || newp == NULL) 534 return (error); 535 536 /* 537 * We're being asked to update the sysctl value, so retrieve 538 * the new value and check for valid range 539 */ 540 lim_value = *(int *)node.sysctl_data; 541 if (lim_value < -256 || lim_value > 255) 542 return (EINVAL); 543 544 sdtemp_set_thresh(sc, reg, (uint16_t)lim_value); 545 546 return (0); 547 } 548 549 /* 550 * power management functions 551 * 552 * We go into "shutdown" mode at suspend time, and return to normal 553 * mode upon resume. This reduces power consumption by disabling 554 * the A/D converter. 555 */ 556 557 static bool 558 sdtemp_pmf_suspend(device_t dev PMF_FN_ARGS) 559 { 560 struct sdtemp_softc *sc = device_private(dev); 561 int error; 562 uint16_t config; 563 564 iic_acquire_bus(sc->sc_tag, 0); 565 error = sdtemp_read_16(sc, SDTEMP_REG_CONFIG, &config); 566 if (error == 0) { 567 config |= SDTEMP_CONFIG_SHUTDOWN_MODE; 568 error = sdtemp_write_16(sc, SDTEMP_REG_CONFIG, config); 569 } 570 iic_release_bus(sc->sc_tag, 0); 571 return (error == 0); 572 } 573 574 static bool 575 sdtemp_pmf_resume(device_t dev PMF_FN_ARGS) 576 { 577 struct sdtemp_softc *sc = device_private(dev); 578 int error; 579 uint16_t config; 580 581 iic_acquire_bus(sc->sc_tag, 0); 582 error = sdtemp_read_16(sc, SDTEMP_REG_CONFIG, &config); 583 if (error == 0) { 584 config &= ~SDTEMP_CONFIG_SHUTDOWN_MODE; 585 error = sdtemp_write_16(sc, SDTEMP_REG_CONFIG, config); 586 } 587 iic_release_bus(sc->sc_tag, 0); 588 return (error == 0); 589 } 590
Indexes created Thu Sep 25 16:09:42 GMT 2025