sdtemp.c revision 1.29
1 /* $NetBSD: sdtemp.c,v 1.29 2016/07/26 08:13:57 msaitoh 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 1.29 2016/07/26 08:13:57 msaitoh 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/module.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 sysmon_envsys_lim_t sc_deflims; 56 uint32_t sc_defprops; 57 int sc_resolution; 58 uint16_t sc_mfgid; 59 uint16_t sc_devid; 60 uint16_t sc_devid_masked; 61 uint16_t sc_capability; 62 }; 63 64 static int sdtemp_match(device_t, cfdata_t, void *); 65 static void sdtemp_attach(device_t, device_t, void *); 66 static int sdtemp_detach(device_t, int); 67 68 CFATTACH_DECL_NEW(sdtemp, sizeof(struct sdtemp_softc), 69 sdtemp_match, sdtemp_attach, sdtemp_detach, NULL); 70 71 static void sdtemp_refresh(struct sysmon_envsys *, envsys_data_t *); 72 static void sdtemp_get_limits(struct sysmon_envsys *, envsys_data_t *, 73 sysmon_envsys_lim_t *, uint32_t *); 74 static void sdtemp_set_limits(struct sysmon_envsys *, envsys_data_t *, 75 sysmon_envsys_lim_t *, uint32_t *); 76 #ifdef NOT_YET 77 static int sdtemp_read_8(struct sdtemp_softc *, uint8_t, uint8_t *); 78 static int sdtemp_write_8(struct sdtemp_softc *, uint8_t, uint8_t); 79 #endif /* NOT YET */ 80 static int sdtemp_read_16(struct sdtemp_softc *, uint8_t, uint16_t *); 81 static int sdtemp_write_16(struct sdtemp_softc *, uint8_t, uint16_t); 82 static uint32_t sdtemp_decode_temp(struct sdtemp_softc *, uint16_t); 83 static bool sdtemp_pmf_suspend(device_t, const pmf_qual_t *); 84 static bool sdtemp_pmf_resume(device_t, const pmf_qual_t *); 85 /* Device dependent config functions */ 86 static void sdtemp_config_mcp(struct sdtemp_softc *); 87 static void sdtemp_config_idt(struct sdtemp_softc *); 88 89 struct sdtemp_dev_entry { 90 const uint16_t sdtemp_mfg_id; 91 const uint16_t sdtemp_devrev; 92 const uint16_t sdtemp_mask; 93 void (*sdtemp_config)(struct sdtemp_softc *); 94 const char *sdtemp_desc; 95 }; 96 97 /* Convert sysmon_envsys uKelvin value to simple degC */ 98 99 #define __UK2C(uk) (((uk) - 273150000) / 1000000) 100 101 /* List of devices known to conform to JEDEC JC42.4 */ 102 103 #define CMCP sdtemp_config_mcp 104 #define CIDT sdtemp_config_idt 105 106 static const struct sdtemp_dev_entry 107 sdtemp_dev_table[] = { 108 { AT_MANUFACTURER_ID, AT_30TS00_DEVICE_ID, AT_30TS00_MASK, NULL, 109 "Atmel AT30TS00" }, 110 { AT2_MANUFACTURER_ID, AT2_30TSE004_DEVICE_ID, AT2_30TSE004_MASK, NULL, 111 "Atmel AT30TSE004" }, 112 { GT_MANUFACTURER_ID, GT_30TS00_DEVICE_ID, GT_30TS00_MASK, NULL, 113 "Giantec GT30TS00" }, 114 { GT2_MANUFACTURER_ID, GT2_34TS02_DEVICE_ID, GT2_34TS02_MASK, NULL, 115 "Giantec GT34TS02" }, 116 { MAXIM_MANUFACTURER_ID, MAX_6604_DEVICE_ID, MAX_6604_MASK, NULL, 117 "Maxim MAX6604" }, 118 { MCP_MANUFACTURER_ID, MCP_9804_DEVICE_ID, MCP_9804_MASK, CMCP, 119 "Microchip Tech MCP9804" }, 120 { MCP_MANUFACTURER_ID, MCP_9805_DEVICE_ID, MCP_9805_MASK, NULL, 121 "Microchip Tech MCP9805/MCP9843" }, 122 { MCP_MANUFACTURER_ID, MCP_98242_DEVICE_ID, MCP_98242_MASK, CMCP, 123 "Microchip Tech MCP98242" }, 124 { MCP_MANUFACTURER_ID, MCP_98243_DEVICE_ID, MCP_98243_MASK, CMCP, 125 "Microchip Tech MCP98243" }, 126 { MCP_MANUFACTURER_ID, MCP_98244_DEVICE_ID, MCP_98244_MASK, CMCP, 127 "Microchip Tech MCP98244" }, 128 { ADT_MANUFACTURER_ID, ADT_7408_DEVICE_ID, ADT_7408_MASK, NULL, 129 "Analog Devices ADT7408" }, 130 { NXP_MANUFACTURER_ID, NXP_SE98_DEVICE_ID, NXP_SE98_MASK, NULL, 131 "NXP Semiconductors SE97B/SE98" }, 132 { NXP_MANUFACTURER_ID, NXP_SE97_DEVICE_ID, NXP_SE97_MASK, NULL, 133 "NXP Semiconductors SE97" }, 134 { STTS_MANUFACTURER_ID, STTS_424E_DEVICE_ID, STTS_424E_MASK, NULL, 135 "STmicroelectronics STTS424E" }, 136 { STTS_MANUFACTURER_ID, STTS_424_DEVICE_ID, STTS_424_MASK, NULL, 137 "STmicroelectronics STTS424" }, 138 { STTS_MANUFACTURER_ID, STTS_2002_DEVICE_ID, STTS_2002_MASK, NULL, 139 "STmicroelectronics STTS2002" }, 140 { STTS_MANUFACTURER_ID, STTS_2004_DEVICE_ID, STTS_2004_MASK, NULL, 141 "STmicroelectronics STTS2004" }, 142 { STTS_MANUFACTURER_ID, STTS_3000_DEVICE_ID, STTS_3000_MASK, NULL, 143 "STmicroelectronics STTS3000" }, 144 { CAT_MANUFACTURER_ID, CAT_34TS02_DEVICE_ID, CAT_34TS02_MASK, NULL, 145 "Catalyst CAT34TS02/CAT6095" }, 146 { CAT_MANUFACTURER_ID, CAT_34TS02C_DEVICE_ID, CAT_34TS02C_MASK, NULL, 147 "Catalyst CAT34TS02C" }, 148 { CAT_MANUFACTURER_ID, CAT_34TS04_DEVICE_ID, CAT_34TS04_MASK, NULL, 149 "Catalyst CAT34TS04" }, 150 { IDT_MANUFACTURER_ID, IDT_TSE2002GB2_DEVICE_ID,IDT_TSE2002GB2_MASK, CIDT, 151 "Integrated Device Technology TSE2002GB2" }, 152 { IDT_MANUFACTURER_ID, IDT_TSE2004GB2_DEVICE_ID,IDT_TSE2004GB2_MASK, NULL, 153 "Integrated Device Technology TSE2004GB2" }, 154 { IDT_MANUFACTURER_ID, IDT_TS3000B3_DEVICE_ID, IDT_TS3000B3_MASK, CIDT, 155 "Integrated Device Technology TS3000B3/TSE2002B3" }, 156 { IDT_MANUFACTURER_ID, IDT_TS3000GB0_DEVICE_ID, IDT_TS3000GB0_MASK, CIDT, 157 "Integrated Device Technology TS3000GB0" }, 158 { IDT_MANUFACTURER_ID, IDT_TS3000GB2_DEVICE_ID, IDT_TS3000GB2_MASK, CIDT, 159 "Integrated Device Technology TS3000GB2" }, 160 { IDT_MANUFACTURER_ID, IDT_TS3001GB2_DEVICE_ID, IDT_TS3001GB2_MASK, CIDT, 161 "Integrated Device Technology TS3001GB2" }, 162 { 0, 0, 0, NULL, "Unknown" } 163 }; 164 165 #undef CMCP 166 #undef CIDT 167 168 static const char *temp_resl[] = { 169 "0.5C", 170 "0.25C", 171 "0.125C", 172 "0.0625C" 173 }; 174 175 static int 176 sdtemp_lookup(uint16_t mfg, uint16_t devrev) 177 { 178 int i; 179 180 for (i = 0; sdtemp_dev_table[i].sdtemp_mfg_id; i++) { 181 if (mfg != sdtemp_dev_table[i].sdtemp_mfg_id) 182 continue; 183 if ((devrev & sdtemp_dev_table[i].sdtemp_mask) == 184 sdtemp_dev_table[i].sdtemp_devrev) 185 break; 186 } 187 188 return i; 189 } 190 191 static int 192 sdtemp_match(device_t parent, cfdata_t cf, void *aux) 193 { 194 struct i2c_attach_args *ia = aux; 195 uint16_t mfgid, devid; 196 struct sdtemp_softc sc; 197 int i, error; 198 199 sc.sc_tag = ia->ia_tag; 200 sc.sc_address = ia->ia_addr; 201 202 if ((ia->ia_addr & SDTEMP_ADDRMASK) != SDTEMP_ADDR) 203 return 0; 204 205 /* Verify that we can read the manufacturer ID & Device ID */ 206 iic_acquire_bus(sc.sc_tag, 0); 207 error = sdtemp_read_16(&sc, SDTEMP_REG_MFG_ID, &mfgid) | 208 sdtemp_read_16(&sc, SDTEMP_REG_DEV_REV, &devid); 209 iic_release_bus(sc.sc_tag, 0); 210 211 if (error) 212 return 0; 213 214 i = sdtemp_lookup(mfgid, devid); 215 if (sdtemp_dev_table[i].sdtemp_mfg_id == 0) { 216 aprint_debug("sdtemp: No match for mfg 0x%04x dev 0x%04x " 217 "rev 0x%02x at address 0x%02x\n", mfgid, devid, 218 devid & 0xff, sc.sc_address); 219 return 0; 220 } 221 222 return 1; 223 } 224 225 static void 226 sdtemp_attach(device_t parent, device_t self, void *aux) 227 { 228 struct sdtemp_softc *sc = device_private(self); 229 struct i2c_attach_args *ia = aux; 230 uint16_t mfgid, devid; 231 int i, error; 232 233 sc->sc_tag = ia->ia_tag; 234 sc->sc_address = ia->ia_addr; 235 sc->sc_dev = self; 236 237 iic_acquire_bus(sc->sc_tag, 0); 238 if ((error = sdtemp_read_16(sc, SDTEMP_REG_MFG_ID, &mfgid)) != 0 || 239 (error = sdtemp_read_16(sc, SDTEMP_REG_DEV_REV, &devid)) != 0) { 240 iic_release_bus(sc->sc_tag, 0); 241 aprint_error(": attach error %d\n", error); 242 return; 243 } 244 sc->sc_mfgid = mfgid; 245 sc->sc_devid = devid; 246 i = sdtemp_lookup(mfgid, devid); 247 sc->sc_devid_masked = devid & sdtemp_dev_table[i].sdtemp_mask; 248 249 aprint_naive(": Temp Sensor\n"); 250 aprint_normal(": %s Temp Sensor\n", sdtemp_dev_table[i].sdtemp_desc); 251 252 if (sdtemp_dev_table[i].sdtemp_mfg_id == 0) 253 aprint_debug_dev(self, 254 "mfg 0x%04x dev 0x%04x rev 0x%02x at addr 0x%02x\n", 255 mfgid, devid, devid & 0xff, ia->ia_addr); 256 257 error = sdtemp_read_16(sc, SDTEMP_REG_CAPABILITY, &sc->sc_capability); 258 aprint_debug_dev(self, "capability reg = %04x\n", sc->sc_capability); 259 sc->sc_resolution 260 = __SHIFTOUT(sc->sc_capability, SDTEMP_CAP_RESOLUTION); 261 /* 262 * Call device dependent function here. Currently, it's used for 263 * the resolution. 264 * 265 * IDT's devices and some Microchip's devices have the resolution 266 * register in the vendor specific registers area. The devices' 267 * resolution bits in the capability register are not the maximum 268 * resolution but the current vaule of the setting. 269 */ 270 if (sdtemp_dev_table[i].sdtemp_config != NULL) 271 sdtemp_dev_table[i].sdtemp_config(sc); 272 273 aprint_normal_dev(self, "%s accuracy", 274 (sc->sc_capability & SDTEMP_CAP_ACCURACY_1C) ? "high" : "default"); 275 if ((sc->sc_capability & SDTEMP_CAP_WIDER_RANGE) != 0) 276 aprint_normal(", wider range"); 277 aprint_normal(", %s resolution", temp_resl[sc->sc_resolution]); 278 if ((sc->sc_capability & SDTEMP_CAP_VHV) != 0) 279 aprint_debug(", high voltage standoff"); 280 aprint_debug(", %s timeout", 281 (sc->sc_capability & SDTEMP_CAP_TMOUT) ? "25-35ms" : "10-60ms"); 282 if ((sc->sc_capability & SDTEMP_CAP_EVSD) != 0) 283 aprint_normal(", event with shutdown"); 284 aprint_normal("\n"); 285 /* 286 * Alarm capability is required; if not present, this is likely 287 * not a real sdtemp device. 288 */ 289 if (error != 0 || (sc->sc_capability & SDTEMP_CAP_HAS_ALARM) == 0) { 290 iic_release_bus(sc->sc_tag, 0); 291 aprint_error_dev(self, 292 "required alarm capability not present!\n"); 293 return; 294 } 295 /* Set the configuration to defaults. */ 296 error = sdtemp_write_16(sc, SDTEMP_REG_CONFIG, 0); 297 if (error != 0) { 298 iic_release_bus(sc->sc_tag, 0); 299 aprint_error_dev(self, "error %d writing config register\n", 300 error); 301 return; 302 } 303 iic_release_bus(sc->sc_tag, 0); 304 305 /* Hook us into the sysmon_envsys subsystem */ 306 sc->sc_sme = sysmon_envsys_create(); 307 sc->sc_sme->sme_name = device_xname(self); 308 sc->sc_sme->sme_cookie = sc; 309 sc->sc_sme->sme_refresh = sdtemp_refresh; 310 sc->sc_sme->sme_get_limits = sdtemp_get_limits; 311 sc->sc_sme->sme_set_limits = sdtemp_set_limits; 312 313 sc->sc_sensor = kmem_zalloc(sizeof(envsys_data_t), KM_NOSLEEP); 314 if (!sc->sc_sensor) { 315 aprint_error_dev(self, "unable to allocate sc_sensor\n"); 316 goto bad2; 317 } 318 319 /* Initialize sensor data. */ 320 sc->sc_sensor->units = ENVSYS_STEMP; 321 sc->sc_sensor->state = ENVSYS_SINVALID; 322 sc->sc_sensor->flags |= ENVSYS_FMONLIMITS; 323 (void)strlcpy(sc->sc_sensor->desc, device_xname(self), 324 sizeof(sc->sc_sensor->desc)); 325 snprintf(sc->sc_sensor->desc, sizeof(sc->sc_sensor->desc), 326 "DIMM %d temperature", sc->sc_address - SDTEMP_ADDR); 327 328 /* Now attach the sensor */ 329 if (sysmon_envsys_sensor_attach(sc->sc_sme, sc->sc_sensor)) { 330 aprint_error_dev(self, "unable to attach sensor\n"); 331 goto bad; 332 } 333 334 /* Register the device */ 335 error = sysmon_envsys_register(sc->sc_sme); 336 if (error) { 337 aprint_error_dev(self, "error %d registering with sysmon\n", 338 error); 339 goto bad; 340 } 341 342 if (!pmf_device_register(self, sdtemp_pmf_suspend, sdtemp_pmf_resume)) 343 aprint_error_dev(self, "couldn't establish power handler\n"); 344 345 /* Retrieve and display hardware monitor limits */ 346 sdtemp_get_limits(sc->sc_sme, sc->sc_sensor, &sc->sc_deflims, 347 &sc->sc_defprops); 348 aprint_normal_dev(self, "Hardware limits: "); 349 i = 0; 350 if (sc->sc_defprops & PROP_WARNMIN) { 351 aprint_normal("low %dC", 352 __UK2C(sc->sc_deflims.sel_warnmin)); 353 i++; 354 } 355 if (sc->sc_defprops & PROP_WARNMAX) { 356 aprint_normal("%shigh %dC ", (i)?", ":"", 357 __UK2C(sc->sc_deflims.sel_warnmax)); 358 i++; 359 } 360 if (sc->sc_defprops & PROP_CRITMAX) { 361 aprint_normal("%scritical %dC ", (i)?", ":"", 362 __UK2C(sc->sc_deflims.sel_critmax)); 363 i++; 364 } 365 aprint_normal("%s\n", (i)?"":"none set"); 366 367 return; 368 369 bad: 370 kmem_free(sc->sc_sensor, sizeof(envsys_data_t)); 371 bad2: 372 sysmon_envsys_destroy(sc->sc_sme); 373 } 374 375 static int 376 sdtemp_detach(device_t self, int flags) 377 { 378 struct sdtemp_softc *sc = device_private(self); 379 380 pmf_device_deregister(self); 381 382 if (sc->sc_sme) 383 sysmon_envsys_unregister(sc->sc_sme); 384 if (sc->sc_sensor) 385 kmem_free(sc->sc_sensor, sizeof(envsys_data_t)); 386 387 return 0; 388 } 389 390 /* Retrieve current limits from device, and encode in uKelvins */ 391 static void 392 sdtemp_get_limits(struct sysmon_envsys *sme, envsys_data_t *edata, 393 sysmon_envsys_lim_t *limits, uint32_t *props) 394 { 395 struct sdtemp_softc *sc = sme->sme_cookie; 396 uint16_t lim; 397 398 *props = 0; 399 iic_acquire_bus(sc->sc_tag, 0); 400 if (sdtemp_read_16(sc, SDTEMP_REG_LOWER_LIM, &lim) == 0 && lim != 0) { 401 limits->sel_warnmin = sdtemp_decode_temp(sc, lim); 402 *props |= PROP_WARNMIN; 403 } 404 if (sdtemp_read_16(sc, SDTEMP_REG_UPPER_LIM, &lim) == 0 && lim != 0) { 405 limits->sel_warnmax = sdtemp_decode_temp(sc, lim); 406 *props |= PROP_WARNMAX; 407 } 408 if (sdtemp_read_16(sc, SDTEMP_REG_CRIT_LIM, &lim) == 0 && lim != 0) { 409 limits->sel_critmax = sdtemp_decode_temp(sc, lim); 410 *props |= PROP_CRITMAX; 411 } 412 iic_release_bus(sc->sc_tag, 0); 413 if (*props != 0) 414 *props |= PROP_DRIVER_LIMITS; 415 } 416 417 /* Send current limit values to the device */ 418 static void 419 sdtemp_set_limits(struct sysmon_envsys *sme, envsys_data_t *edata, 420 sysmon_envsys_lim_t *limits, uint32_t *props) 421 { 422 uint16_t val; 423 struct sdtemp_softc *sc = sme->sme_cookie; 424 425 if (limits == NULL) { 426 limits = &sc->sc_deflims; 427 props = &sc->sc_defprops; 428 } 429 iic_acquire_bus(sc->sc_tag, 0); 430 if (*props & PROP_WARNMIN) { 431 val = __UK2C(limits->sel_warnmin); 432 (void)sdtemp_write_16(sc, SDTEMP_REG_LOWER_LIM, 433 (val << 4) & SDTEMP_TEMP_MASK); 434 } 435 if (*props & PROP_WARNMAX) { 436 val = __UK2C(limits->sel_warnmax); 437 (void)sdtemp_write_16(sc, SDTEMP_REG_UPPER_LIM, 438 (val << 4) & SDTEMP_TEMP_MASK); 439 } 440 if (*props & PROP_CRITMAX) { 441 val = __UK2C(limits->sel_critmax); 442 (void)sdtemp_write_16(sc, SDTEMP_REG_CRIT_LIM, 443 (val << 4) & SDTEMP_TEMP_MASK); 444 } 445 iic_release_bus(sc->sc_tag, 0); 446 447 /* 448 * If at least one limit is set that we can handle, and no 449 * limits are set that we cannot handle, tell sysmon that 450 * the driver will take care of monitoring the limits! 451 */ 452 if (*props & (PROP_CRITMIN | PROP_BATTCAP | PROP_BATTWARN)) 453 *props &= ~PROP_DRIVER_LIMITS; 454 else if (*props & PROP_LIMITS) 455 *props |= PROP_DRIVER_LIMITS; 456 else 457 *props &= ~PROP_DRIVER_LIMITS; 458 } 459 460 #ifdef NOT_YET /* All registers on these sensors are 16-bits */ 461 462 /* Read a 8-bit value from a register */ 463 static int 464 sdtemp_read_8(struct sdtemp_softc *sc, uint8_t reg, uint8_t *valp) 465 { 466 int error; 467 468 error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 469 sc->sc_address, ®, 1, valp, sizeof(*valp), 0); 470 471 return error; 472 } 473 474 static int 475 sdtemp_write_8(struct sdtemp_softc *sc, uint8_t reg, uint8_t val) 476 { 477 return iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 478 sc->sc_address, ®, 1, &val, sizeof(val), 0); 479 } 480 #endif /* NOT_YET */ 481 482 /* Read a 16-bit value from a register */ 483 static int 484 sdtemp_read_16(struct sdtemp_softc *sc, uint8_t reg, uint16_t *valp) 485 { 486 int error; 487 488 error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 489 sc->sc_address, ®, 1, valp, sizeof(*valp), 0); 490 if (error) 491 return error; 492 493 *valp = be16toh(*valp); 494 495 return 0; 496 } 497 498 static int 499 sdtemp_write_16(struct sdtemp_softc *sc, uint8_t reg, uint16_t val) 500 { 501 uint16_t temp; 502 503 temp = htobe16(val); 504 return iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 505 sc->sc_address, ®, 1, &temp, sizeof(temp), 0); 506 } 507 508 static uint32_t 509 sdtemp_decode_temp(struct sdtemp_softc *sc, uint16_t temp) 510 { 511 uint32_t val; 512 int32_t stemp; 513 514 /* Get only the temperature bits */ 515 temp &= SDTEMP_TEMP_MASK; 516 517 /* If necessary, extend the sign bit */ 518 if ((sc->sc_capability & SDTEMP_CAP_WIDER_RANGE) && 519 (temp & SDTEMP_TEMP_NEGATIVE)) 520 temp |= SDTEMP_TEMP_SIGN_EXT; 521 522 /* Mask off only bits valid within current resolution */ 523 temp &= ~(0x7 >> sc->sc_resolution); 524 525 /* Treat as signed and extend to 32-bits */ 526 stemp = (int16_t)temp; 527 528 /* Now convert from 0.0625 (1/16) deg C increments to microKelvins */ 529 val = (stemp * 62500) + 273150000; 530 531 return val; 532 } 533 534 static void 535 sdtemp_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 536 { 537 struct sdtemp_softc *sc = sme->sme_cookie; 538 uint16_t val; 539 int error; 540 541 iic_acquire_bus(sc->sc_tag, 0); 542 error = sdtemp_read_16(sc, SDTEMP_REG_AMBIENT_TEMP, &val); 543 iic_release_bus(sc->sc_tag, 0); 544 545 if (error) { 546 edata->state = ENVSYS_SINVALID; 547 return; 548 } 549 550 edata->value_cur = sdtemp_decode_temp(sc, val); 551 552 /* Now check for limits */ 553 if ((edata->upropset & PROP_DRIVER_LIMITS) == 0) 554 edata->state = ENVSYS_SVALID; 555 else if ((val & SDTEMP_ABOVE_CRIT) && 556 (edata->upropset & PROP_CRITMAX)) 557 edata->state = ENVSYS_SCRITOVER; 558 else if ((val & SDTEMP_ABOVE_UPPER) && 559 (edata->upropset & PROP_WARNMAX)) 560 edata->state = ENVSYS_SWARNOVER; 561 else if ((val & SDTEMP_BELOW_LOWER) && 562 (edata->upropset & PROP_WARNMIN)) 563 edata->state = ENVSYS_SWARNUNDER; 564 else 565 edata->state = ENVSYS_SVALID; 566 } 567 568 /* 569 * power management functions 570 * 571 * We go into "shutdown" mode at suspend time, and return to normal 572 * mode upon resume. This reduces power consumption by disabling 573 * the A/D converter. 574 */ 575 576 static bool 577 sdtemp_pmf_suspend(device_t dev, const pmf_qual_t *qual) 578 { 579 struct sdtemp_softc *sc = device_private(dev); 580 int error; 581 uint16_t config; 582 583 iic_acquire_bus(sc->sc_tag, 0); 584 error = sdtemp_read_16(sc, SDTEMP_REG_CONFIG, &config); 585 if (error == 0) { 586 config |= SDTEMP_CONFIG_SHUTDOWN_MODE; 587 error = sdtemp_write_16(sc, SDTEMP_REG_CONFIG, config); 588 } 589 iic_release_bus(sc->sc_tag, 0); 590 return (error == 0); 591 } 592 593 static bool 594 sdtemp_pmf_resume(device_t dev, const pmf_qual_t *qual) 595 { 596 struct sdtemp_softc *sc = device_private(dev); 597 int error; 598 uint16_t config; 599 600 iic_acquire_bus(sc->sc_tag, 0); 601 error = sdtemp_read_16(sc, SDTEMP_REG_CONFIG, &config); 602 if (error == 0) { 603 config &= ~SDTEMP_CONFIG_SHUTDOWN_MODE; 604 error = sdtemp_write_16(sc, SDTEMP_REG_CONFIG, config); 605 } 606 iic_release_bus(sc->sc_tag, 0); 607 return (error == 0); 608 } 609 610 /* Device dependent config functions */ 611 612 static void 613 sdtemp_config_mcp(struct sdtemp_softc *sc) 614 { 615 int rv; 616 uint8_t resolreg; 617 618 /* Note that MCP9805 has no resolution register */ 619 switch (sc->sc_devid_masked) { 620 case MCP_9804_DEVICE_ID: 621 case MCP_98242_DEVICE_ID: 622 case MCP_98243_DEVICE_ID: 623 resolreg = SDTEMP_REG_MCP_RESOLUTION_9804; 624 break; 625 case MCP_98244_DEVICE_ID: 626 resolreg = SDTEMP_REG_MCP_RESOLUTION_98244; 627 break; 628 default: 629 aprint_error("%s: %s: unknown device ID (%04hx)\n", 630 device_xname(sc->sc_dev), __func__, sc->sc_devid_masked); 631 return; 632 } 633 634 /* 635 * Set resolution to the max. 636 * 637 * Even if it fails, the resolution will be the default. It's not a 638 * fatal error. 639 */ 640 rv = sdtemp_write_16(sc, resolreg, SDTEMP_CAP_RESOLUTION_MAX); 641 if (rv == 0) 642 sc->sc_resolution = SDTEMP_CAP_RESOLUTION_MAX; 643 else 644 aprint_error("%s: error %d writing resolution register\n", 645 device_xname(sc->sc_dev), rv); 646 } 647 648 static void 649 sdtemp_config_idt(struct sdtemp_softc *sc) 650 { 651 int rv; 652 653 /* 654 * Set resolution to the max. 655 * 656 * Even if it fails, the resolution will be the default. It's not a 657 * fatal error. 658 */ 659 rv = sdtemp_write_16(sc, SDTEMP_REG_IDT_RESOLUTION, 660 __SHIFTIN(SDTEMP_CAP_RESOLUTION_MAX, SDTEMP_CAP_RESOLUTION)); 661 if (rv == 0) 662 sc->sc_resolution = SDTEMP_CAP_RESOLUTION_MAX; 663 else 664 aprint_error("%s: error %d writing resolution register\n", 665 device_xname(sc->sc_dev), rv); 666 } 667 668 MODULE(MODULE_CLASS_DRIVER, sdtemp, "i2cexec,sysmon_envsys"); 669 670 #ifdef _MODULE 671 #include "ioconf.c" 672 #endif 673 674 static int 675 sdtemp_modcmd(modcmd_t cmd, void *opaque) 676 { 677 int error = 0; 678 679 switch (cmd) { 680 case MODULE_CMD_INIT: 681 #ifdef _MODULE 682 error = config_init_component(cfdriver_ioconf_sdtemp, 683 cfattach_ioconf_sdtemp, cfdata_ioconf_sdtemp); 684 #endif 685 return error; 686 case MODULE_CMD_FINI: 687 #ifdef _MODULE 688 error = config_fini_component(cfdriver_ioconf_sdtemp, 689 cfattach_ioconf_sdtemp, cfdata_ioconf_sdtemp); 690 #endif 691 return error; 692 default: 693 return ENOTTY; 694 } 695 } 696
Indexes created Fri Sep 26 08:10:20 GMT 2025