sdtemp.c revision 1.37
1 /* $NetBSD: sdtemp.c,v 1.37 2020/06/29 06:01:30 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 1.37 2020/06/29 06:01:30 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 { MAXIM_MANUFACTURER_ID, MAX_6604_2_DEVICE_ID, MAX_6604_MASK, NULL, 119 "Maxim MAX6604" }, 120 { MCP_MANUFACTURER_ID, MCP_9804_DEVICE_ID, MCP_9804_MASK, CMCP, 121 "Microchip Tech MCP9804" }, 122 { MCP_MANUFACTURER_ID, MCP_9805_DEVICE_ID, MCP_9805_MASK, NULL, 123 "Microchip Tech MCP9805/MCP9843" }, 124 { MCP_MANUFACTURER_ID, MCP_98242_DEVICE_ID, MCP_98242_MASK, CMCP, 125 "Microchip Tech MCP98242" }, 126 { MCP_MANUFACTURER_ID, MCP_98243_DEVICE_ID, MCP_98243_MASK, CMCP, 127 "Microchip Tech MCP98243" }, 128 { MCP_MANUFACTURER_ID, MCP_98244_DEVICE_ID, MCP_98244_MASK, CMCP, 129 "Microchip Tech MCP98244" }, 130 { MCP2_MANUFACTURER_ID, MCP2_EMC1501_DEVICE_ID, MCP2_EMC1501_MASK, NULL, 131 "Microchip Tech EMC1501" }, 132 { ADT_MANUFACTURER_ID, ADT_7408_DEVICE_ID, ADT_7408_MASK, NULL, 133 "Analog Devices ADT7408" }, 134 { NXP_MANUFACTURER_ID, NXP_SE98_DEVICE_ID, NXP_SE98_MASK, NULL, 135 "NXP Semiconductors SE97B/SE98" }, 136 { NXP_MANUFACTURER_ID, NXP_SE97_DEVICE_ID, NXP_SE97_MASK, NULL, 137 "NXP Semiconductors SE97" }, 138 { STTS_MANUFACTURER_ID, STTS_424E_DEVICE_ID, STTS_424E_MASK, NULL, 139 "STmicroelectronics STTS424E" }, 140 { STTS_MANUFACTURER_ID, STTS_424_DEVICE_ID, STTS_424_MASK, NULL, 141 "STmicroelectronics STTS424" }, 142 { STTS_MANUFACTURER_ID, STTS_2002_DEVICE_ID, STTS_2002_MASK, NULL, 143 "STmicroelectronics STTS2002" }, 144 { STTS_MANUFACTURER_ID, STTS_2004_DEVICE_ID, STTS_2004_MASK, NULL, 145 "STmicroelectronics STTS2004" }, 146 { STTS_MANUFACTURER_ID, STTS_3000_DEVICE_ID, STTS_3000_MASK, NULL, 147 "STmicroelectronics STTS3000" }, 148 { CAT_MANUFACTURER_ID, CAT_34TS02_DEVICE_ID, CAT_34TS02_MASK, NULL, 149 "Catalyst CAT34TS02/CAT6095" }, 150 { CAT_MANUFACTURER_ID, CAT_34TS02C_DEVICE_ID, CAT_34TS02C_MASK, NULL, 151 "Catalyst CAT34TS02C" }, 152 { CAT_MANUFACTURER_ID, CAT_34TS04_DEVICE_ID, CAT_34TS04_MASK, NULL, 153 "Catalyst CAT34TS04" }, 154 { IDT_MANUFACTURER_ID, IDT_TSE2004GB2_DEVICE_ID,IDT_TSE2004GB2_MASK, NULL, 155 "Integrated Device Technology TSE2004GB2" }, 156 { IDT_MANUFACTURER_ID, IDT_TS3000B3_DEVICE_ID, IDT_TS3000B3_MASK, CIDT, 157 "Integrated Device Technology TS3000B3/TSE2002B3" }, 158 { IDT_MANUFACTURER_ID, IDT_TS3000GB0_DEVICE_ID, IDT_TS3000GB0_MASK, CIDT, 159 "Integrated Device Technology TS3000GB0" }, 160 { IDT_MANUFACTURER_ID, IDT_TS3000GB2_DEVICE_ID, IDT_TS3000GB2_MASK, CIDT, 161 "Integrated Device Technology TS3000GB2" }, 162 { IDT_MANUFACTURER_ID, IDT_TS3001GB2_DEVICE_ID, IDT_TS3001GB2_MASK, CIDT, 163 "Integrated Device Technology TS3001GB2" }, 164 /* 165 * Don't change the location of the following two entries. Device specific 166 * entry must be located at above. 167 */ 168 { 0, TSE2004AV_ID, TSE2004AV_MASK, NULL, 169 "TSE2004av compliant device (generic driver)" }, 170 { 0, 0, 0, NULL, "Unknown" } 171 }; 172 173 #undef CMCP 174 #undef CIDT 175 176 static const char *temp_resl[] = { 177 "0.5C", 178 "0.25C", 179 "0.125C", 180 "0.0625C" 181 }; 182 183 static int 184 sdtemp_lookup(uint16_t mfg, uint16_t devrev) 185 { 186 int i; 187 188 for (i = 0; sdtemp_dev_table[i].sdtemp_mfg_id; i++) { 189 if (mfg != sdtemp_dev_table[i].sdtemp_mfg_id) 190 continue; 191 if ((devrev & sdtemp_dev_table[i].sdtemp_mask) == 192 sdtemp_dev_table[i].sdtemp_devrev) 193 break; 194 } 195 /* Check TSE2004av */ 196 if ((sdtemp_dev_table[i].sdtemp_mfg_id == 0) 197 && (SDTEMP_IS_TSE2004AV(devrev) == 0)) 198 i++; /* Unknown */ 199 200 return i; 201 } 202 203 static int 204 sdtemp_match(device_t parent, cfdata_t cf, void *aux) 205 { 206 struct i2c_attach_args *ia = aux; 207 uint16_t mfgid, devid, cap; 208 struct sdtemp_softc sc; 209 int i, error; 210 211 sc.sc_tag = ia->ia_tag; 212 sc.sc_address = ia->ia_addr; 213 214 if ((ia->ia_addr & SDTEMP_ADDRMASK) != SDTEMP_ADDR) 215 return 0; 216 217 /* 218 * Verify that we can read the manufacturer ID, Device ID and the 219 * capability 220 */ 221 iic_acquire_bus(sc.sc_tag, 0); 222 error = sdtemp_read_16(&sc, SDTEMP_REG_MFG_ID, &mfgid) | 223 sdtemp_read_16(&sc, SDTEMP_REG_DEV_REV, &devid) | 224 sdtemp_read_16(&sc, SDTEMP_REG_CAPABILITY, &cap); 225 iic_release_bus(sc.sc_tag, 0); 226 227 if (error) 228 return 0; 229 230 i = sdtemp_lookup(mfgid, devid); 231 if ((sdtemp_dev_table[i].sdtemp_mfg_id == 0) && 232 (sdtemp_dev_table[i].sdtemp_devrev == 0)) { 233 aprint_debug("sdtemp: No match for mfg 0x%04x dev 0x%02x " 234 "rev 0x%02x at address 0x%02x\n", mfgid, devid >> 8, 235 devid & 0xff, sc.sc_address); 236 return 0; 237 } 238 239 /* 240 * Check by SDTEMP_IS_TSE2004AV() might not be enough, so check the 241 * alarm capability, too. 242 */ 243 if ((cap & SDTEMP_CAP_HAS_ALARM) == 0) 244 return 0; 245 246 return I2C_MATCH_ADDRESS_AND_PROBE; 247 } 248 249 static void 250 sdtemp_attach(device_t parent, device_t self, void *aux) 251 { 252 struct sdtemp_softc *sc = device_private(self); 253 struct i2c_attach_args *ia = aux; 254 uint16_t mfgid, devid; 255 int i, error; 256 257 sc->sc_tag = ia->ia_tag; 258 sc->sc_address = ia->ia_addr; 259 sc->sc_dev = self; 260 261 iic_acquire_bus(sc->sc_tag, 0); 262 if ((error = sdtemp_read_16(sc, SDTEMP_REG_MFG_ID, &mfgid)) != 0 || 263 (error = sdtemp_read_16(sc, SDTEMP_REG_DEV_REV, &devid)) != 0) { 264 iic_release_bus(sc->sc_tag, 0); 265 aprint_error(": attach error %d\n", error); 266 return; 267 } 268 sc->sc_mfgid = mfgid; 269 sc->sc_devid = devid; 270 i = sdtemp_lookup(mfgid, devid); 271 sc->sc_devid_masked = devid & sdtemp_dev_table[i].sdtemp_mask; 272 273 aprint_naive(": Temp Sensor\n"); 274 aprint_normal(": %s Temp Sensor\n", sdtemp_dev_table[i].sdtemp_desc); 275 276 if (sdtemp_dev_table[i].sdtemp_mfg_id == 0) { 277 if (SDTEMP_IS_TSE2004AV(devid)) 278 aprint_normal_dev(self, "TSE2004av compliant. " 279 "Manufacturer ID 0x%04hx, Device revision 0x%02x\n", 280 mfgid, devid & TSE2004AV_REV); 281 else { 282 aprint_error_dev(self, 283 "mfg 0x%04x dev 0x%02x rev 0x%02x at addr 0x%02x\n", 284 mfgid, devid >> 8, devid & 0xff, ia->ia_addr); 285 iic_release_bus(sc->sc_tag, 0); 286 aprint_error_dev(self, "It should no happen. " 287 "Why attach() found me?\n"); 288 return; 289 } 290 } 291 292 error = sdtemp_read_16(sc, SDTEMP_REG_CAPABILITY, &sc->sc_capability); 293 aprint_debug_dev(self, "capability reg = %04x\n", sc->sc_capability); 294 sc->sc_resolution 295 = __SHIFTOUT(sc->sc_capability, SDTEMP_CAP_RESOLUTION); 296 /* 297 * Call device dependent function here. Currently, it's used for 298 * the resolution. 299 * 300 * IDT's devices and some Microchip's devices have the resolution 301 * register in the vendor specific registers area. The devices' 302 * resolution bits in the capability register are not the maximum 303 * resolution but the current value of the setting. 304 */ 305 if (sdtemp_dev_table[i].sdtemp_config != NULL) 306 sdtemp_dev_table[i].sdtemp_config(sc); 307 308 aprint_normal_dev(self, "%s accuracy", 309 (sc->sc_capability & SDTEMP_CAP_ACCURACY_1C) ? "high" : "default"); 310 if ((sc->sc_capability & SDTEMP_CAP_WIDER_RANGE) != 0) 311 aprint_normal(", wider range"); 312 aprint_normal(", %s resolution", temp_resl[sc->sc_resolution]); 313 if ((sc->sc_capability & SDTEMP_CAP_VHV) != 0) 314 aprint_debug(", high voltage standoff"); 315 aprint_debug(", %s timeout", 316 (sc->sc_capability & SDTEMP_CAP_TMOUT) ? "25-35ms" : "10-60ms"); 317 if ((sc->sc_capability & SDTEMP_CAP_EVSD) != 0) 318 aprint_normal(", event with shutdown"); 319 aprint_normal("\n"); 320 /* 321 * Alarm capability is required; if not present, this is likely 322 * not a real sdtemp device. 323 */ 324 if (error != 0 || (sc->sc_capability & SDTEMP_CAP_HAS_ALARM) == 0) { 325 iic_release_bus(sc->sc_tag, 0); 326 aprint_error_dev(self, 327 "required alarm capability not present!\n"); 328 return; 329 } 330 /* Set the configuration to defaults. */ 331 error = sdtemp_write_16(sc, SDTEMP_REG_CONFIG, 0); 332 if (error != 0) { 333 iic_release_bus(sc->sc_tag, 0); 334 aprint_error_dev(self, "error %d writing config register\n", 335 error); 336 return; 337 } 338 iic_release_bus(sc->sc_tag, 0); 339 340 /* Hook us into the sysmon_envsys subsystem */ 341 sc->sc_sme = sysmon_envsys_create(); 342 sc->sc_sme->sme_name = device_xname(self); 343 sc->sc_sme->sme_cookie = sc; 344 sc->sc_sme->sme_refresh = sdtemp_refresh; 345 sc->sc_sme->sme_get_limits = sdtemp_get_limits; 346 sc->sc_sme->sme_set_limits = sdtemp_set_limits; 347 348 sc->sc_sensor = kmem_zalloc(sizeof(envsys_data_t), KM_SLEEP); 349 350 /* Initialize sensor data. */ 351 sc->sc_sensor->units = ENVSYS_STEMP; 352 sc->sc_sensor->state = ENVSYS_SINVALID; 353 sc->sc_sensor->flags |= ENVSYS_FMONLIMITS; 354 (void)strlcpy(sc->sc_sensor->desc, device_xname(self), 355 sizeof(sc->sc_sensor->desc)); 356 snprintf(sc->sc_sensor->desc, sizeof(sc->sc_sensor->desc), 357 "DIMM %d temperature", sc->sc_address - SDTEMP_ADDR); 358 359 /* Now attach the sensor */ 360 if (sysmon_envsys_sensor_attach(sc->sc_sme, sc->sc_sensor)) { 361 aprint_error_dev(self, "unable to attach sensor\n"); 362 goto bad; 363 } 364 365 /* Register the device */ 366 error = sysmon_envsys_register(sc->sc_sme); 367 if (error) { 368 aprint_error_dev(self, "error %d registering with sysmon\n", 369 error); 370 goto bad; 371 } 372 373 if (!pmf_device_register(self, sdtemp_pmf_suspend, sdtemp_pmf_resume)) 374 aprint_error_dev(self, "couldn't establish power handler\n"); 375 376 /* Retrieve and display hardware monitor limits */ 377 sdtemp_get_limits(sc->sc_sme, sc->sc_sensor, &sc->sc_deflims, 378 &sc->sc_defprops); 379 aprint_normal_dev(self, "Hardware limits: "); 380 i = 0; 381 if (sc->sc_defprops & PROP_WARNMIN) { 382 aprint_normal("low %dC", 383 __UK2C(sc->sc_deflims.sel_warnmin)); 384 i++; 385 } 386 if (sc->sc_defprops & PROP_WARNMAX) { 387 aprint_normal("%shigh %dC ", (i)?", ":"", 388 __UK2C(sc->sc_deflims.sel_warnmax)); 389 i++; 390 } 391 if (sc->sc_defprops & PROP_CRITMAX) { 392 aprint_normal("%scritical %dC ", (i)?", ":"", 393 __UK2C(sc->sc_deflims.sel_critmax)); 394 i++; 395 } 396 aprint_normal("%s\n", (i)?"":"none set"); 397 398 return; 399 400 bad: 401 kmem_free(sc->sc_sensor, sizeof(envsys_data_t)); 402 sysmon_envsys_destroy(sc->sc_sme); 403 } 404 405 static int 406 sdtemp_detach(device_t self, int flags) 407 { 408 struct sdtemp_softc *sc = device_private(self); 409 410 pmf_device_deregister(self); 411 412 if (sc->sc_sme) 413 sysmon_envsys_unregister(sc->sc_sme); 414 if (sc->sc_sensor) 415 kmem_free(sc->sc_sensor, sizeof(envsys_data_t)); 416 417 return 0; 418 } 419 420 /* Retrieve current limits from device, and encode in uKelvins */ 421 static void 422 sdtemp_get_limits(struct sysmon_envsys *sme, envsys_data_t *edata, 423 sysmon_envsys_lim_t *limits, uint32_t *props) 424 { 425 struct sdtemp_softc *sc = sme->sme_cookie; 426 uint16_t lim; 427 428 *props = 0; 429 iic_acquire_bus(sc->sc_tag, 0); 430 if (sdtemp_read_16(sc, SDTEMP_REG_LOWER_LIM, &lim) == 0 && lim != 0) { 431 limits->sel_warnmin = sdtemp_decode_temp(sc, lim); 432 *props |= PROP_WARNMIN; 433 } 434 if (sdtemp_read_16(sc, SDTEMP_REG_UPPER_LIM, &lim) == 0 && lim != 0) { 435 limits->sel_warnmax = sdtemp_decode_temp(sc, lim); 436 *props |= PROP_WARNMAX; 437 } 438 if (sdtemp_read_16(sc, SDTEMP_REG_CRIT_LIM, &lim) == 0 && lim != 0) { 439 limits->sel_critmax = sdtemp_decode_temp(sc, lim); 440 *props |= PROP_CRITMAX; 441 } 442 iic_release_bus(sc->sc_tag, 0); 443 if (*props != 0) 444 *props |= PROP_DRIVER_LIMITS; 445 } 446 447 /* Send current limit values to the device */ 448 static void 449 sdtemp_set_limits(struct sysmon_envsys *sme, envsys_data_t *edata, 450 sysmon_envsys_lim_t *limits, uint32_t *props) 451 { 452 uint16_t val; 453 struct sdtemp_softc *sc = sme->sme_cookie; 454 455 if (limits == NULL) { 456 limits = &sc->sc_deflims; 457 props = &sc->sc_defprops; 458 } 459 iic_acquire_bus(sc->sc_tag, 0); 460 if (*props & PROP_WARNMIN) { 461 val = __UK2C(limits->sel_warnmin); 462 (void)sdtemp_write_16(sc, SDTEMP_REG_LOWER_LIM, 463 (val << 4) & SDTEMP_TEMP_MASK); 464 } 465 if (*props & PROP_WARNMAX) { 466 val = __UK2C(limits->sel_warnmax); 467 (void)sdtemp_write_16(sc, SDTEMP_REG_UPPER_LIM, 468 (val << 4) & SDTEMP_TEMP_MASK); 469 } 470 if (*props & PROP_CRITMAX) { 471 val = __UK2C(limits->sel_critmax); 472 (void)sdtemp_write_16(sc, SDTEMP_REG_CRIT_LIM, 473 (val << 4) & SDTEMP_TEMP_MASK); 474 } 475 iic_release_bus(sc->sc_tag, 0); 476 477 /* 478 * If at least one limit is set that we can handle, and no 479 * limits are set that we cannot handle, tell sysmon that 480 * the driver will take care of monitoring the limits! 481 */ 482 if (*props & (PROP_CRITMIN | PROP_BATTCAP | PROP_BATTWARN)) 483 *props &= ~PROP_DRIVER_LIMITS; 484 else if (*props & PROP_LIMITS) 485 *props |= PROP_DRIVER_LIMITS; 486 else 487 *props &= ~PROP_DRIVER_LIMITS; 488 } 489 490 #ifdef NOT_YET /* All registers on these sensors are 16-bits */ 491 492 /* Read a 8-bit value from a register */ 493 static int 494 sdtemp_read_8(struct sdtemp_softc *sc, uint8_t reg, uint8_t *valp) 495 { 496 int error; 497 498 error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 499 sc->sc_address, ®, 1, valp, sizeof(*valp), 0); 500 501 return error; 502 } 503 504 static int 505 sdtemp_write_8(struct sdtemp_softc *sc, uint8_t reg, uint8_t val) 506 { 507 return iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 508 sc->sc_address, ®, 1, &val, sizeof(val), 0); 509 } 510 #endif /* NOT_YET */ 511 512 /* Read a 16-bit value from a register */ 513 static int 514 sdtemp_read_16(struct sdtemp_softc *sc, uint8_t reg, uint16_t *valp) 515 { 516 int error; 517 518 error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 519 sc->sc_address, ®, 1, valp, sizeof(*valp), 0); 520 if (error) 521 return error; 522 523 *valp = be16toh(*valp); 524 525 return 0; 526 } 527 528 static int 529 sdtemp_write_16(struct sdtemp_softc *sc, uint8_t reg, uint16_t val) 530 { 531 uint16_t temp; 532 533 temp = htobe16(val); 534 return iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 535 sc->sc_address, ®, 1, &temp, sizeof(temp), 0); 536 } 537 538 static uint32_t 539 sdtemp_decode_temp(struct sdtemp_softc *sc, uint16_t temp) 540 { 541 uint32_t val; 542 int32_t stemp; 543 544 /* Get only the temperature bits */ 545 temp &= SDTEMP_TEMP_MASK; 546 547 /* If necessary, extend the sign bit */ 548 if ((sc->sc_capability & SDTEMP_CAP_WIDER_RANGE) && 549 (temp & SDTEMP_TEMP_NEGATIVE)) 550 temp |= SDTEMP_TEMP_SIGN_EXT; 551 552 /* Mask off only bits valid within current resolution */ 553 temp &= ~(0x7 >> sc->sc_resolution); 554 555 /* Treat as signed and extend to 32-bits */ 556 stemp = (int16_t)temp; 557 558 /* Now convert from 0.0625 (1/16) deg C increments to microKelvins */ 559 val = (stemp * 62500) + 273150000; 560 561 return val; 562 } 563 564 static void 565 sdtemp_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 566 { 567 struct sdtemp_softc *sc = sme->sme_cookie; 568 uint16_t val; 569 int error; 570 571 iic_acquire_bus(sc->sc_tag, 0); 572 error = sdtemp_read_16(sc, SDTEMP_REG_AMBIENT_TEMP, &val); 573 iic_release_bus(sc->sc_tag, 0); 574 575 if (error) { 576 edata->state = ENVSYS_SINVALID; 577 return; 578 } 579 580 edata->value_cur = sdtemp_decode_temp(sc, val); 581 582 /* Now check for limits */ 583 if ((edata->upropset & PROP_DRIVER_LIMITS) == 0) 584 edata->state = ENVSYS_SVALID; 585 else if ((val & SDTEMP_ABOVE_CRIT) && 586 (edata->upropset & PROP_CRITMAX)) 587 edata->state = ENVSYS_SCRITOVER; 588 else if ((val & SDTEMP_ABOVE_UPPER) && 589 (edata->upropset & PROP_WARNMAX)) 590 edata->state = ENVSYS_SWARNOVER; 591 else if ((val & SDTEMP_BELOW_LOWER) && 592 (edata->upropset & PROP_WARNMIN)) 593 edata->state = ENVSYS_SWARNUNDER; 594 else 595 edata->state = ENVSYS_SVALID; 596 } 597 598 /* 599 * Power management functions 600 * 601 * We go into "shutdown" mode at suspend time, and return to normal 602 * mode upon resume. This reduces power consumption by disabling 603 * the A/D converter. 604 */ 605 606 static bool 607 sdtemp_pmf_suspend(device_t dev, const pmf_qual_t *qual) 608 { 609 struct sdtemp_softc *sc = device_private(dev); 610 int error; 611 uint16_t config; 612 613 iic_acquire_bus(sc->sc_tag, 0); 614 error = sdtemp_read_16(sc, SDTEMP_REG_CONFIG, &config); 615 if (error == 0) { 616 config |= SDTEMP_CONFIG_SHUTDOWN_MODE; 617 error = sdtemp_write_16(sc, SDTEMP_REG_CONFIG, config); 618 } 619 iic_release_bus(sc->sc_tag, 0); 620 return (error == 0); 621 } 622 623 static bool 624 sdtemp_pmf_resume(device_t dev, const pmf_qual_t *qual) 625 { 626 struct sdtemp_softc *sc = device_private(dev); 627 int error; 628 uint16_t config; 629 630 iic_acquire_bus(sc->sc_tag, 0); 631 error = sdtemp_read_16(sc, SDTEMP_REG_CONFIG, &config); 632 if (error == 0) { 633 config &= ~SDTEMP_CONFIG_SHUTDOWN_MODE; 634 error = sdtemp_write_16(sc, SDTEMP_REG_CONFIG, config); 635 } 636 iic_release_bus(sc->sc_tag, 0); 637 return (error == 0); 638 } 639 640 /* Device dependent config functions */ 641 642 static void 643 sdtemp_config_mcp(struct sdtemp_softc *sc) 644 { 645 int rv; 646 uint8_t resolreg; 647 648 /* Note that MCP9805 has no resolution register */ 649 switch (sc->sc_devid_masked) { 650 case MCP_9804_DEVICE_ID: 651 case MCP_98242_DEVICE_ID: 652 case MCP_98243_DEVICE_ID: 653 resolreg = SDTEMP_REG_MCP_RESOLUTION_9804; 654 break; 655 case MCP_98244_DEVICE_ID: 656 resolreg = SDTEMP_REG_MCP_RESOLUTION_98244; 657 break; 658 default: 659 aprint_error("%s: %s: unknown device ID (%04hx)\n", 660 device_xname(sc->sc_dev), __func__, sc->sc_devid_masked); 661 return; 662 } 663 664 /* 665 * Set resolution to the max. 666 * 667 * Even if it fails, the resolution will be the default. It's not a 668 * fatal error. 669 */ 670 rv = sdtemp_write_16(sc, resolreg, SDTEMP_CAP_RESOLUTION_MAX); 671 if (rv == 0) 672 sc->sc_resolution = SDTEMP_CAP_RESOLUTION_MAX; 673 else 674 aprint_error("%s: error %d writing resolution register\n", 675 device_xname(sc->sc_dev), rv); 676 } 677 678 static void 679 sdtemp_config_idt(struct sdtemp_softc *sc) 680 { 681 int rv; 682 683 /* 684 * Set resolution to the max. 685 * 686 * Even if it fails, the resolution will be the default. It's not a 687 * fatal error. 688 */ 689 rv = sdtemp_write_16(sc, SDTEMP_REG_IDT_RESOLUTION, 690 __SHIFTIN(SDTEMP_CAP_RESOLUTION_MAX, SDTEMP_CAP_RESOLUTION)); 691 if (rv == 0) 692 sc->sc_resolution = SDTEMP_CAP_RESOLUTION_MAX; 693 else 694 aprint_error("%s: error %d writing resolution register\n", 695 device_xname(sc->sc_dev), rv); 696 } 697 698 MODULE(MODULE_CLASS_DRIVER, sdtemp, "i2cexec,sysmon_envsys"); 699 700 #ifdef _MODULE 701 #include "ioconf.c" 702 #endif 703 704 static int 705 sdtemp_modcmd(modcmd_t cmd, void *opaque) 706 { 707 int error = 0; 708 709 switch (cmd) { 710 case MODULE_CMD_INIT: 711 #ifdef _MODULE 712 error = config_init_component(cfdriver_ioconf_sdtemp, 713 cfattach_ioconf_sdtemp, cfdata_ioconf_sdtemp); 714 #endif 715 return error; 716 case MODULE_CMD_FINI: 717 #ifdef _MODULE 718 error = config_fini_component(cfdriver_ioconf_sdtemp, 719 cfattach_ioconf_sdtemp, cfdata_ioconf_sdtemp); 720 #endif 721 return error; 722 default: 723 return ENOTTY; 724 } 725 } 726
Indexes created Fri Sep 26 20:09:58 GMT 2025