1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * lm90.c - Part of lm_sensors, Linux kernel modules for hardware 4 * monitoring 5 * Copyright (C) 2003-2010 Jean Delvare <jdelvare@suse.de> 6 * 7 * Based on the lm83 driver. The LM90 is a sensor chip made by National 8 * Semiconductor. It reports up to two temperatures (its own plus up to 9 * one external one) with a 0.125 deg resolution (1 deg for local 10 * temperature) and a 3-4 deg accuracy. 11 * 12 * This driver also supports the LM89 and LM99, two other sensor chips 13 * made by National Semiconductor. Both have an increased remote 14 * temperature measurement accuracy (1 degree), and the LM99 15 * additionally shifts remote temperatures (measured and limits) by 16 16 * degrees, which allows for higher temperatures measurement. 17 * Note that there is no way to differentiate between both chips. 18 * When device is auto-detected, the driver will assume an LM99. 19 * 20 * This driver also supports the LM86, another sensor chip made by 21 * National Semiconductor. It is exactly similar to the LM90 except it 22 * has a higher accuracy. 23 * 24 * This driver also supports the ADM1032, a sensor chip made by Analog 25 * Devices. That chip is similar to the LM90, with a few differences 26 * that are not handled by this driver. Among others, it has a higher 27 * accuracy than the LM90, much like the LM86 does. 28 * 29 * This driver also supports the MAX6657, MAX6658 and MAX6659 sensor 30 * chips made by Maxim. These chips are similar to the LM86. 31 * Note that there is no easy way to differentiate between the three 32 * variants. We use the device address to detect MAX6659, which will result 33 * in a detection as max6657 if it is on address 0x4c. The extra address 34 * and features of the MAX6659 are only supported if the chip is configured 35 * explicitly as max6659, or if its address is not 0x4c. 36 * These chips lack the remote temperature offset feature. 37 * 38 * This driver also supports the MAX6654 chip made by Maxim. This chip can be 39 * at 9 different addresses, similar to MAX6680/MAX6681. The MAX6654 is similar 40 * to MAX6657/MAX6658/MAX6659, but does not support critical temperature 41 * limits. Extended range is available by setting the configuration register 42 * accordingly, and is done during initialization. Extended precision is only 43 * available at conversion rates of 1 Hz and slower. Note that extended 44 * precision is not enabled by default, as this driver initializes all chips 45 * to 2 Hz by design. 46 * 47 * This driver also supports the MAX6646, MAX6647, MAX6648, MAX6649 and 48 * MAX6692 chips made by Maxim. These are again similar to the LM86, 49 * but they use unsigned temperature values and can report temperatures 50 * from 0 to 145 degrees. 51 * 52 * This driver also supports the MAX6680 and MAX6681, two other sensor 53 * chips made by Maxim. These are quite similar to the other Maxim 54 * chips. The MAX6680 and MAX6681 only differ in the pinout so they can 55 * be treated identically. 56 * 57 * This driver also supports the MAX6695 and MAX6696, two other sensor 58 * chips made by Maxim. These are also quite similar to other Maxim 59 * chips, but support three temperature sensors instead of two. MAX6695 60 * and MAX6696 only differ in the pinout so they can be treated identically. 61 * 62 * This driver also supports ADT7461 and ADT7461A from Analog Devices as well as 63 * NCT1008 from ON Semiconductor. The chips are supported in both compatibility 64 * and extended mode. They are mostly compatible with LM90 except for a data 65 * format difference for the temperature value registers. 66 * 67 * This driver also supports the SA56004 from Philips. This device is 68 * pin-compatible with the LM86, the ED/EDP parts are also address-compatible. 69 * 70 * This driver also supports the G781 from GMT. This device is compatible 71 * with the ADM1032. 72 * 73 * This driver also supports TMP451 and TMP461 from Texas Instruments. 74 * Those devices are supported in both compatibility and extended mode. 75 * They are mostly compatible with ADT7461 except for local temperature 76 * low byte register and max conversion rate. 77 * 78 * Since the LM90 was the first chipset supported by this driver, most 79 * comments will refer to this chipset, but are actually general and 80 * concern all supported chipsets, unless mentioned otherwise. 81 */ 82 83 #include <linux/module.h> 84 #include <linux/init.h> 85 #include <linux/slab.h> 86 #include <linux/jiffies.h> 87 #include <linux/i2c.h> 88 #include <linux/hwmon.h> 89 #include <linux/err.h> 90 #include <linux/mutex.h> 91 #include <linux/of_device.h> 92 #include <linux/sysfs.h> 93 #include <linux/interrupt.h> 94 #include <linux/regulator/consumer.h> 95 96 /* 97 * Addresses to scan 98 * Address is fully defined internally and cannot be changed except for 99 * MAX6659, MAX6680 and MAX6681. 100 * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, ADT7461A, MAX6649, 101 * MAX6657, MAX6658, NCT1008 and W83L771 have address 0x4c. 102 * ADM1032-2, ADT7461-2, ADT7461A-2, LM89-1, LM99-1, MAX6646, and NCT1008D 103 * have address 0x4d. 104 * MAX6647 has address 0x4e. 105 * MAX6659 can have address 0x4c, 0x4d or 0x4e. 106 * MAX6654, MAX6680, and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 107 * 0x2a, 0x2b, 0x4c, 0x4d or 0x4e. 108 * SA56004 can have address 0x48 through 0x4F. 109 */ 110 111 static const unsigned short normal_i2c[] = { 112 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 113 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; 114 115 enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680, 116 max6646, w83l771, max6696, sa56004, g781, tmp451, tmp461, max6654 }; 117 118 /* 119 * The LM90 registers 120 */ 121 122 #define LM90_REG_R_MAN_ID 0xFE 123 #define LM90_REG_R_CHIP_ID 0xFF 124 #define LM90_REG_R_CONFIG1 0x03 125 #define LM90_REG_W_CONFIG1 0x09 126 #define LM90_REG_R_CONFIG2 0xBF 127 #define LM90_REG_W_CONFIG2 0xBF 128 #define LM90_REG_R_CONVRATE 0x04 129 #define LM90_REG_W_CONVRATE 0x0A 130 #define LM90_REG_R_STATUS 0x02 131 #define LM90_REG_R_LOCAL_TEMP 0x00 132 #define LM90_REG_R_LOCAL_HIGH 0x05 133 #define LM90_REG_W_LOCAL_HIGH 0x0B 134 #define LM90_REG_R_LOCAL_LOW 0x06 135 #define LM90_REG_W_LOCAL_LOW 0x0C 136 #define LM90_REG_R_LOCAL_CRIT 0x20 137 #define LM90_REG_W_LOCAL_CRIT 0x20 138 #define LM90_REG_R_REMOTE_TEMPH 0x01 139 #define LM90_REG_R_REMOTE_TEMPL 0x10 140 #define LM90_REG_R_REMOTE_OFFSH 0x11 141 #define LM90_REG_W_REMOTE_OFFSH 0x11 142 #define LM90_REG_R_REMOTE_OFFSL 0x12 143 #define LM90_REG_W_REMOTE_OFFSL 0x12 144 #define LM90_REG_R_REMOTE_HIGHH 0x07 145 #define LM90_REG_W_REMOTE_HIGHH 0x0D 146 #define LM90_REG_R_REMOTE_HIGHL 0x13 147 #define LM90_REG_W_REMOTE_HIGHL 0x13 148 #define LM90_REG_R_REMOTE_LOWH 0x08 149 #define LM90_REG_W_REMOTE_LOWH 0x0E 150 #define LM90_REG_R_REMOTE_LOWL 0x14 151 #define LM90_REG_W_REMOTE_LOWL 0x14 152 #define LM90_REG_R_REMOTE_CRIT 0x19 153 #define LM90_REG_W_REMOTE_CRIT 0x19 154 #define LM90_REG_R_TCRIT_HYST 0x21 155 #define LM90_REG_W_TCRIT_HYST 0x21 156 157 /* MAX6646/6647/6649/6654/6657/6658/6659/6695/6696 registers */ 158 159 #define MAX6657_REG_R_LOCAL_TEMPL 0x11 160 #define MAX6696_REG_R_STATUS2 0x12 161 #define MAX6659_REG_R_REMOTE_EMERG 0x16 162 #define MAX6659_REG_W_REMOTE_EMERG 0x16 163 #define MAX6659_REG_R_LOCAL_EMERG 0x17 164 #define MAX6659_REG_W_LOCAL_EMERG 0x17 165 166 /* SA56004 registers */ 167 168 #define SA56004_REG_R_LOCAL_TEMPL 0x22 169 170 #define LM90_MAX_CONVRATE_MS 16000 /* Maximum conversion rate in ms */ 171 172 /* TMP451/TMP461 registers */ 173 #define TMP451_REG_R_LOCAL_TEMPL 0x15 174 #define TMP451_REG_CONALERT 0x22 175 176 #define TMP461_REG_CHEN 0x16 177 #define TMP461_REG_DFC 0x24 178 179 /* 180 * Device flags 181 */ 182 #define LM90_FLAG_ADT7461_EXT (1 << 0) /* ADT7461 extended mode */ 183 /* Device features */ 184 #define LM90_HAVE_OFFSET (1 << 1) /* temperature offset register */ 185 #define LM90_HAVE_REM_LIMIT_EXT (1 << 3) /* extended remote limit */ 186 #define LM90_HAVE_EMERGENCY (1 << 4) /* 3rd upper (emergency) limit */ 187 #define LM90_HAVE_EMERGENCY_ALARM (1 << 5)/* emergency alarm */ 188 #define LM90_HAVE_TEMP3 (1 << 6) /* 3rd temperature sensor */ 189 #define LM90_HAVE_BROKEN_ALERT (1 << 7) /* Broken alert */ 190 #define LM90_HAVE_EXTENDED_TEMP (1 << 8) /* extended temperature support*/ 191 #define LM90_PAUSE_FOR_CONFIG (1 << 9) /* Pause conversion for config */ 192 #define LM90_HAVE_CRIT (1 << 10)/* Chip supports CRIT/OVERT register */ 193 #define LM90_HAVE_CRIT_ALRM_SWP (1 << 11)/* critical alarm bits swapped */ 194 195 /* LM90 status */ 196 #define LM90_STATUS_LTHRM (1 << 0) /* local THERM limit tripped */ 197 #define LM90_STATUS_RTHRM (1 << 1) /* remote THERM limit tripped */ 198 #define LM90_STATUS_ROPEN (1 << 2) /* remote is an open circuit */ 199 #define LM90_STATUS_RLOW (1 << 3) /* remote low temp limit tripped */ 200 #define LM90_STATUS_RHIGH (1 << 4) /* remote high temp limit tripped */ 201 #define LM90_STATUS_LLOW (1 << 5) /* local low temp limit tripped */ 202 #define LM90_STATUS_LHIGH (1 << 6) /* local high temp limit tripped */ 203 #define LM90_STATUS_BUSY (1 << 7) /* conversion is ongoing */ 204 205 #define MAX6696_STATUS2_R2THRM (1 << 1) /* remote2 THERM limit tripped */ 206 #define MAX6696_STATUS2_R2OPEN (1 << 2) /* remote2 is an open circuit */ 207 #define MAX6696_STATUS2_R2LOW (1 << 3) /* remote2 low temp limit tripped */ 208 #define MAX6696_STATUS2_R2HIGH (1 << 4) /* remote2 high temp limit tripped */ 209 #define MAX6696_STATUS2_ROT2 (1 << 5) /* remote emergency limit tripped */ 210 #define MAX6696_STATUS2_R2OT2 (1 << 6) /* remote2 emergency limit tripped */ 211 #define MAX6696_STATUS2_LOT2 (1 << 7) /* local emergency limit tripped */ 212 213 /* 214 * Driver data (common to all clients) 215 */ 216 217 static const struct i2c_device_id lm90_id[] = { 218 { "adm1032", adm1032 }, 219 { "adt7461", adt7461 }, 220 { "adt7461a", adt7461 }, 221 { "g781", g781 }, 222 { "lm90", lm90 }, 223 { "lm86", lm86 }, 224 { "lm89", lm86 }, 225 { "lm99", lm99 }, 226 { "max6646", max6646 }, 227 { "max6647", max6646 }, 228 { "max6649", max6646 }, 229 { "max6654", max6654 }, 230 { "max6657", max6657 }, 231 { "max6658", max6657 }, 232 { "max6659", max6659 }, 233 { "max6680", max6680 }, 234 { "max6681", max6680 }, 235 { "max6695", max6696 }, 236 { "max6696", max6696 }, 237 { "nct1008", adt7461 }, 238 { "w83l771", w83l771 }, 239 { "sa56004", sa56004 }, 240 { "tmp451", tmp451 }, 241 { "tmp461", tmp461 }, 242 { } 243 }; 244 MODULE_DEVICE_TABLE(i2c, lm90_id); 245 246 static const struct of_device_id __maybe_unused lm90_of_match[] = { 247 { 248 .compatible = "adi,adm1032", 249 .data = (void *)adm1032 250 }, 251 { 252 .compatible = "adi,adt7461", 253 .data = (void *)adt7461 254 }, 255 { 256 .compatible = "adi,adt7461a", 257 .data = (void *)adt7461 258 }, 259 { 260 .compatible = "gmt,g781", 261 .data = (void *)g781 262 }, 263 { 264 .compatible = "national,lm90", 265 .data = (void *)lm90 266 }, 267 { 268 .compatible = "national,lm86", 269 .data = (void *)lm86 270 }, 271 { 272 .compatible = "national,lm89", 273 .data = (void *)lm86 274 }, 275 { 276 .compatible = "national,lm99", 277 .data = (void *)lm99 278 }, 279 { 280 .compatible = "dallas,max6646", 281 .data = (void *)max6646 282 }, 283 { 284 .compatible = "dallas,max6647", 285 .data = (void *)max6646 286 }, 287 { 288 .compatible = "dallas,max6649", 289 .data = (void *)max6646 290 }, 291 { 292 .compatible = "dallas,max6654", 293 .data = (void *)max6654 294 }, 295 { 296 .compatible = "dallas,max6657", 297 .data = (void *)max6657 298 }, 299 { 300 .compatible = "dallas,max6658", 301 .data = (void *)max6657 302 }, 303 { 304 .compatible = "dallas,max6659", 305 .data = (void *)max6659 306 }, 307 { 308 .compatible = "dallas,max6680", 309 .data = (void *)max6680 310 }, 311 { 312 .compatible = "dallas,max6681", 313 .data = (void *)max6680 314 }, 315 { 316 .compatible = "dallas,max6695", 317 .data = (void *)max6696 318 }, 319 { 320 .compatible = "dallas,max6696", 321 .data = (void *)max6696 322 }, 323 { 324 .compatible = "onnn,nct1008", 325 .data = (void *)adt7461 326 }, 327 { 328 .compatible = "winbond,w83l771", 329 .data = (void *)w83l771 330 }, 331 { 332 .compatible = "nxp,sa56004", 333 .data = (void *)sa56004 334 }, 335 { 336 .compatible = "ti,tmp451", 337 .data = (void *)tmp451 338 }, 339 { 340 .compatible = "ti,tmp461", 341 .data = (void *)tmp461 342 }, 343 { }, 344 }; 345 MODULE_DEVICE_TABLE(of, lm90_of_match); 346 347 /* 348 * chip type specific parameters 349 */ 350 struct lm90_params { 351 u32 flags; /* Capabilities */ 352 u16 alert_alarms; /* Which alarm bits trigger ALERT# */ 353 /* Upper 8 bits for max6695/96 */ 354 u8 max_convrate; /* Maximum conversion rate register value */ 355 u8 reg_local_ext; /* Extended local temp register (optional) */ 356 }; 357 358 static const struct lm90_params lm90_params[] = { 359 [adm1032] = { 360 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT 361 | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_CRIT, 362 .alert_alarms = 0x7c, 363 .max_convrate = 10, 364 }, 365 [adt7461] = { 366 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT 367 | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_EXTENDED_TEMP 368 | LM90_HAVE_CRIT, 369 .alert_alarms = 0x7c, 370 .max_convrate = 10, 371 }, 372 [g781] = { 373 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT 374 | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_CRIT, 375 .alert_alarms = 0x7c, 376 .max_convrate = 7, 377 }, 378 [lm86] = { 379 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT 380 | LM90_HAVE_CRIT, 381 .alert_alarms = 0x7b, 382 .max_convrate = 9, 383 }, 384 [lm90] = { 385 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT 386 | LM90_HAVE_CRIT, 387 .alert_alarms = 0x7b, 388 .max_convrate = 9, 389 }, 390 [lm99] = { 391 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT 392 | LM90_HAVE_CRIT, 393 .alert_alarms = 0x7b, 394 .max_convrate = 9, 395 }, 396 [max6646] = { 397 .flags = LM90_HAVE_CRIT | LM90_HAVE_BROKEN_ALERT, 398 .alert_alarms = 0x7c, 399 .max_convrate = 6, 400 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL, 401 }, 402 [max6654] = { 403 .flags = LM90_HAVE_BROKEN_ALERT, 404 .alert_alarms = 0x7c, 405 .max_convrate = 7, 406 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL, 407 }, 408 [max6657] = { 409 .flags = LM90_PAUSE_FOR_CONFIG | LM90_HAVE_CRIT, 410 .alert_alarms = 0x7c, 411 .max_convrate = 8, 412 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL, 413 }, 414 [max6659] = { 415 .flags = LM90_HAVE_EMERGENCY | LM90_HAVE_CRIT, 416 .alert_alarms = 0x7c, 417 .max_convrate = 8, 418 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL, 419 }, 420 [max6680] = { 421 .flags = LM90_HAVE_OFFSET | LM90_HAVE_CRIT 422 | LM90_HAVE_CRIT_ALRM_SWP | LM90_HAVE_BROKEN_ALERT, 423 .alert_alarms = 0x7c, 424 .max_convrate = 7, 425 }, 426 [max6696] = { 427 .flags = LM90_HAVE_EMERGENCY 428 | LM90_HAVE_EMERGENCY_ALARM | LM90_HAVE_TEMP3 | LM90_HAVE_CRIT, 429 .alert_alarms = 0x1c7c, 430 .max_convrate = 6, 431 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL, 432 }, 433 [w83l771] = { 434 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT | LM90_HAVE_CRIT, 435 .alert_alarms = 0x7c, 436 .max_convrate = 8, 437 }, 438 [sa56004] = { 439 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT | LM90_HAVE_CRIT, 440 .alert_alarms = 0x7b, 441 .max_convrate = 9, 442 .reg_local_ext = SA56004_REG_R_LOCAL_TEMPL, 443 }, 444 [tmp451] = { 445 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT 446 | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_EXTENDED_TEMP | LM90_HAVE_CRIT, 447 .alert_alarms = 0x7c, 448 .max_convrate = 9, 449 .reg_local_ext = TMP451_REG_R_LOCAL_TEMPL, 450 }, 451 [tmp461] = { 452 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT 453 | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_EXTENDED_TEMP | LM90_HAVE_CRIT, 454 .alert_alarms = 0x7c, 455 .max_convrate = 9, 456 .reg_local_ext = TMP451_REG_R_LOCAL_TEMPL, 457 }, 458 }; 459 460 /* 461 * TEMP8 register index 462 */ 463 enum lm90_temp8_reg_index { 464 LOCAL_LOW = 0, 465 LOCAL_HIGH, 466 LOCAL_CRIT, 467 REMOTE_CRIT, 468 LOCAL_EMERG, /* max6659 and max6695/96 */ 469 REMOTE_EMERG, /* max6659 and max6695/96 */ 470 REMOTE2_CRIT, /* max6695/96 only */ 471 REMOTE2_EMERG, /* max6695/96 only */ 472 TEMP8_REG_NUM 473 }; 474 475 /* 476 * TEMP11 register index 477 */ 478 enum lm90_temp11_reg_index { 479 REMOTE_TEMP = 0, 480 REMOTE_LOW, 481 REMOTE_HIGH, 482 REMOTE_OFFSET, /* except max6646, max6657/58/59, and max6695/96 */ 483 LOCAL_TEMP, 484 REMOTE2_TEMP, /* max6695/96 only */ 485 REMOTE2_LOW, /* max6695/96 only */ 486 REMOTE2_HIGH, /* max6695/96 only */ 487 TEMP11_REG_NUM 488 }; 489 490 /* 491 * Client data (each client gets its own) 492 */ 493 494 struct lm90_data { 495 struct i2c_client *client; 496 struct device *hwmon_dev; 497 u32 channel_config[4]; 498 struct hwmon_channel_info temp_info; 499 const struct hwmon_channel_info *info[3]; 500 struct hwmon_chip_info chip; 501 struct mutex update_lock; 502 bool valid; /* true if register values are valid */ 503 unsigned long last_updated; /* in jiffies */ 504 int kind; 505 u32 flags; 506 507 unsigned int update_interval; /* in milliseconds */ 508 509 u8 config; /* Current configuration register value */ 510 u8 config_orig; /* Original configuration register value */ 511 u8 convrate_orig; /* Original conversion rate register value */ 512 u16 alert_alarms; /* Which alarm bits trigger ALERT# */ 513 /* Upper 8 bits for max6695/96 */ 514 u8 max_convrate; /* Maximum conversion rate */ 515 u8 reg_local_ext; /* local extension register offset */ 516 517 /* registers values */ 518 s8 temp8[TEMP8_REG_NUM]; 519 s16 temp11[TEMP11_REG_NUM]; 520 u8 temp_hyst; 521 u16 alarms; /* bitvector (upper 8 bits for max6695/96) */ 522 }; 523 524 /* 525 * Support functions 526 */ 527 528 /* 529 * The ADM1032 supports PEC but not on write byte transactions, so we need 530 * to explicitly ask for a transaction without PEC. 531 */ 532 static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value) 533 { 534 return i2c_smbus_xfer(client->adapter, client->addr, 535 client->flags & ~I2C_CLIENT_PEC, 536 I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL); 537 } 538 539 /* 540 * It is assumed that client->update_lock is held (unless we are in 541 * detection or initialization steps). This matters when PEC is enabled, 542 * because we don't want the address pointer to change between the write 543 * byte and the read byte transactions. 544 */ 545 static int lm90_read_reg(struct i2c_client *client, u8 reg) 546 { 547 int err; 548 549 if (client->flags & I2C_CLIENT_PEC) { 550 err = adm1032_write_byte(client, reg); 551 if (err >= 0) 552 err = i2c_smbus_read_byte(client); 553 } else 554 err = i2c_smbus_read_byte_data(client, reg); 555 556 return err; 557 } 558 559 static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl) 560 { 561 int oldh, newh, l; 562 563 /* 564 * There is a trick here. We have to read two registers to have the 565 * sensor temperature, but we have to beware a conversion could occur 566 * between the readings. The datasheet says we should either use 567 * the one-shot conversion register, which we don't want to do 568 * (disables hardware monitoring) or monitor the busy bit, which is 569 * impossible (we can't read the values and monitor that bit at the 570 * exact same time). So the solution used here is to read the high 571 * byte once, then the low byte, then the high byte again. If the new 572 * high byte matches the old one, then we have a valid reading. Else 573 * we have to read the low byte again, and now we believe we have a 574 * correct reading. 575 */ 576 oldh = lm90_read_reg(client, regh); 577 if (oldh < 0) 578 return oldh; 579 l = lm90_read_reg(client, regl); 580 if (l < 0) 581 return l; 582 newh = lm90_read_reg(client, regh); 583 if (newh < 0) 584 return newh; 585 if (oldh != newh) { 586 l = lm90_read_reg(client, regl); 587 if (l < 0) 588 return l; 589 } 590 return (newh << 8) | l; 591 } 592 593 static int lm90_update_confreg(struct lm90_data *data, u8 config) 594 { 595 if (data->config != config) { 596 int err; 597 598 err = i2c_smbus_write_byte_data(data->client, 599 LM90_REG_W_CONFIG1, 600 config); 601 if (err) 602 return err; 603 data->config = config; 604 } 605 return 0; 606 } 607 608 /* 609 * client->update_lock must be held when calling this function (unless we are 610 * in detection or initialization steps), and while a remote channel other 611 * than channel 0 is selected. Also, calling code must make sure to re-select 612 * external channel 0 before releasing the lock. This is necessary because 613 * various registers have different meanings as a result of selecting a 614 * non-default remote channel. 615 */ 616 static int lm90_select_remote_channel(struct lm90_data *data, int channel) 617 { 618 int err = 0; 619 620 if (data->kind == max6696) { 621 u8 config = data->config & ~0x08; 622 623 if (channel) 624 config |= 0x08; 625 err = lm90_update_confreg(data, config); 626 } 627 return err; 628 } 629 630 static int lm90_write_convrate(struct lm90_data *data, int val) 631 { 632 u8 config = data->config; 633 int err; 634 635 /* Save config and pause conversion */ 636 if (data->flags & LM90_PAUSE_FOR_CONFIG) { 637 err = lm90_update_confreg(data, config | 0x40); 638 if (err < 0) 639 return err; 640 } 641 642 /* Set conv rate */ 643 err = i2c_smbus_write_byte_data(data->client, LM90_REG_W_CONVRATE, val); 644 645 /* Revert change to config */ 646 lm90_update_confreg(data, config); 647 648 return err; 649 } 650 651 /* 652 * Set conversion rate. 653 * client->update_lock must be held when calling this function (unless we are 654 * in detection or initialization steps). 655 */ 656 static int lm90_set_convrate(struct i2c_client *client, struct lm90_data *data, 657 unsigned int interval) 658 { 659 unsigned int update_interval; 660 int i, err; 661 662 /* Shift calculations to avoid rounding errors */ 663 interval <<= 6; 664 665 /* find the nearest update rate */ 666 for (i = 0, update_interval = LM90_MAX_CONVRATE_MS << 6; 667 i < data->max_convrate; i++, update_interval >>= 1) 668 if (interval >= update_interval * 3 / 4) 669 break; 670 671 err = lm90_write_convrate(data, i); 672 data->update_interval = DIV_ROUND_CLOSEST(update_interval, 64); 673 return err; 674 } 675 676 static int lm90_update_limits(struct device *dev) 677 { 678 struct lm90_data *data = dev_get_drvdata(dev); 679 struct i2c_client *client = data->client; 680 int val; 681 682 if (data->flags & LM90_HAVE_CRIT) { 683 val = lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT); 684 if (val < 0) 685 return val; 686 data->temp8[LOCAL_CRIT] = val; 687 688 val = lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT); 689 if (val < 0) 690 return val; 691 data->temp8[REMOTE_CRIT] = val; 692 693 val = lm90_read_reg(client, LM90_REG_R_TCRIT_HYST); 694 if (val < 0) 695 return val; 696 data->temp_hyst = val; 697 } 698 699 val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH); 700 if (val < 0) 701 return val; 702 data->temp11[REMOTE_LOW] = val << 8; 703 704 if (data->flags & LM90_HAVE_REM_LIMIT_EXT) { 705 val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL); 706 if (val < 0) 707 return val; 708 data->temp11[REMOTE_LOW] |= val; 709 } 710 711 val = lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH); 712 if (val < 0) 713 return val; 714 data->temp11[REMOTE_HIGH] = val << 8; 715 716 if (data->flags & LM90_HAVE_REM_LIMIT_EXT) { 717 val = lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL); 718 if (val < 0) 719 return val; 720 data->temp11[REMOTE_HIGH] |= val; 721 } 722 723 if (data->flags & LM90_HAVE_OFFSET) { 724 val = lm90_read16(client, LM90_REG_R_REMOTE_OFFSH, 725 LM90_REG_R_REMOTE_OFFSL); 726 if (val < 0) 727 return val; 728 data->temp11[REMOTE_OFFSET] = val; 729 } 730 731 if (data->flags & LM90_HAVE_EMERGENCY) { 732 val = lm90_read_reg(client, MAX6659_REG_R_LOCAL_EMERG); 733 if (val < 0) 734 return val; 735 data->temp8[LOCAL_EMERG] = val; 736 737 val = lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG); 738 if (val < 0) 739 return val; 740 data->temp8[REMOTE_EMERG] = val; 741 } 742 743 if (data->kind == max6696) { 744 val = lm90_select_remote_channel(data, 1); 745 if (val < 0) 746 return val; 747 748 val = lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT); 749 if (val < 0) 750 return val; 751 data->temp8[REMOTE2_CRIT] = val; 752 753 val = lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG); 754 if (val < 0) 755 return val; 756 data->temp8[REMOTE2_EMERG] = val; 757 758 val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH); 759 if (val < 0) 760 return val; 761 data->temp11[REMOTE2_LOW] = val << 8; 762 763 val = lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH); 764 if (val < 0) 765 return val; 766 data->temp11[REMOTE2_HIGH] = val << 8; 767 768 lm90_select_remote_channel(data, 0); 769 } 770 771 return 0; 772 } 773 774 static int lm90_update_device(struct device *dev) 775 { 776 struct lm90_data *data = dev_get_drvdata(dev); 777 struct i2c_client *client = data->client; 778 unsigned long next_update; 779 int val; 780 781 if (!data->valid) { 782 val = lm90_update_limits(dev); 783 if (val < 0) 784 return val; 785 } 786 787 next_update = data->last_updated + 788 msecs_to_jiffies(data->update_interval); 789 if (time_after(jiffies, next_update) || !data->valid) { 790 dev_dbg(&client->dev, "Updating lm90 data.\n"); 791 792 data->valid = false; 793 794 val = lm90_read_reg(client, LM90_REG_R_LOCAL_LOW); 795 if (val < 0) 796 return val; 797 data->temp8[LOCAL_LOW] = val; 798 799 val = lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH); 800 if (val < 0) 801 return val; 802 data->temp8[LOCAL_HIGH] = val; 803 804 if (data->reg_local_ext) { 805 val = lm90_read16(client, LM90_REG_R_LOCAL_TEMP, 806 data->reg_local_ext); 807 if (val < 0) 808 return val; 809 data->temp11[LOCAL_TEMP] = val; 810 } else { 811 val = lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP); 812 if (val < 0) 813 return val; 814 data->temp11[LOCAL_TEMP] = val << 8; 815 } 816 val = lm90_read16(client, LM90_REG_R_REMOTE_TEMPH, 817 LM90_REG_R_REMOTE_TEMPL); 818 if (val < 0) 819 return val; 820 data->temp11[REMOTE_TEMP] = val; 821 822 val = lm90_read_reg(client, LM90_REG_R_STATUS); 823 if (val < 0) 824 return val; 825 data->alarms = val & ~LM90_STATUS_BUSY; 826 827 if (data->kind == max6696) { 828 val = lm90_select_remote_channel(data, 1); 829 if (val < 0) 830 return val; 831 832 val = lm90_read16(client, LM90_REG_R_REMOTE_TEMPH, 833 LM90_REG_R_REMOTE_TEMPL); 834 if (val < 0) { 835 lm90_select_remote_channel(data, 0); 836 return val; 837 } 838 data->temp11[REMOTE2_TEMP] = val; 839 840 lm90_select_remote_channel(data, 0); 841 842 val = lm90_read_reg(client, MAX6696_REG_R_STATUS2); 843 if (val < 0) 844 return val; 845 data->alarms |= val << 8; 846 } 847 848 /* 849 * Re-enable ALERT# output if it was originally enabled and 850 * relevant alarms are all clear 851 */ 852 if ((client->irq || !(data->config_orig & 0x80)) && 853 !(data->alarms & data->alert_alarms)) { 854 if (data->config & 0x80) { 855 dev_dbg(&client->dev, "Re-enabling ALERT#\n"); 856 lm90_update_confreg(data, data->config & ~0x80); 857 } 858 } 859 860 data->last_updated = jiffies; 861 data->valid = true; 862 } 863 864 return 0; 865 } 866 867 /* 868 * Conversions 869 * For local temperatures and limits, critical limits and the hysteresis 870 * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius. 871 * For remote temperatures and limits, it uses signed 11-bit values with 872 * LSB = 0.125 degree Celsius, left-justified in 16-bit registers. Some 873 * Maxim chips use unsigned values. 874 */ 875 876 static inline int temp_from_s8(s8 val) 877 { 878 return val * 1000; 879 } 880 881 static inline int temp_from_u8(u8 val) 882 { 883 return val * 1000; 884 } 885 886 static inline int temp_from_s16(s16 val) 887 { 888 return val / 32 * 125; 889 } 890 891 static inline int temp_from_u16(u16 val) 892 { 893 return val / 32 * 125; 894 } 895 896 static s8 temp_to_s8(long val) 897 { 898 if (val <= -128000) 899 return -128; 900 if (val >= 127000) 901 return 127; 902 if (val < 0) 903 return (val - 500) / 1000; 904 return (val + 500) / 1000; 905 } 906 907 static u8 temp_to_u8(long val) 908 { 909 if (val <= 0) 910 return 0; 911 if (val >= 255000) 912 return 255; 913 return (val + 500) / 1000; 914 } 915 916 static s16 temp_to_s16(long val) 917 { 918 if (val <= -128000) 919 return 0x8000; 920 if (val >= 127875) 921 return 0x7FE0; 922 if (val < 0) 923 return (val - 62) / 125 * 32; 924 return (val + 62) / 125 * 32; 925 } 926 927 static u8 hyst_to_reg(long val) 928 { 929 if (val <= 0) 930 return 0; 931 if (val >= 30500) 932 return 31; 933 return (val + 500) / 1000; 934 } 935 936 /* 937 * ADT7461 in compatibility mode is almost identical to LM90 except that 938 * attempts to write values that are outside the range 0 < temp < 127 are 939 * treated as the boundary value. 940 * 941 * ADT7461 in "extended mode" operation uses unsigned integers offset by 942 * 64 (e.g., 0 -> -64 degC). The range is restricted to -64..191 degC. 943 */ 944 static inline int temp_from_u8_adt7461(struct lm90_data *data, u8 val) 945 { 946 if (data->flags & LM90_FLAG_ADT7461_EXT) 947 return (val - 64) * 1000; 948 return temp_from_s8(val); 949 } 950 951 static inline int temp_from_u16_adt7461(struct lm90_data *data, u16 val) 952 { 953 if (data->flags & LM90_FLAG_ADT7461_EXT) 954 return (val - 0x4000) / 64 * 250; 955 return temp_from_s16(val); 956 } 957 958 static u8 temp_to_u8_adt7461(struct lm90_data *data, long val) 959 { 960 if (data->flags & LM90_FLAG_ADT7461_EXT) { 961 if (val <= -64000) 962 return 0; 963 if (val >= 191000) 964 return 0xFF; 965 return (val + 500 + 64000) / 1000; 966 } 967 if (val <= 0) 968 return 0; 969 if (val >= 127000) 970 return 127; 971 return (val + 500) / 1000; 972 } 973 974 static u16 temp_to_u16_adt7461(struct lm90_data *data, long val) 975 { 976 if (data->flags & LM90_FLAG_ADT7461_EXT) { 977 if (val <= -64000) 978 return 0; 979 if (val >= 191750) 980 return 0xFFC0; 981 return (val + 64000 + 125) / 250 * 64; 982 } 983 if (val <= 0) 984 return 0; 985 if (val >= 127750) 986 return 0x7FC0; 987 return (val + 125) / 250 * 64; 988 } 989 990 /* pec used for ADM1032 only */ 991 static ssize_t pec_show(struct device *dev, struct device_attribute *dummy, 992 char *buf) 993 { 994 struct i2c_client *client = to_i2c_client(dev); 995 996 return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC)); 997 } 998 999 static ssize_t pec_store(struct device *dev, struct device_attribute *dummy, 1000 const char *buf, size_t count) 1001 { 1002 struct i2c_client *client = to_i2c_client(dev); 1003 long val; 1004 int err; 1005 1006 err = kstrtol(buf, 10, &val); 1007 if (err < 0) 1008 return err; 1009 1010 switch (val) { 1011 case 0: 1012 client->flags &= ~I2C_CLIENT_PEC; 1013 break; 1014 case 1: 1015 client->flags |= I2C_CLIENT_PEC; 1016 break; 1017 default: 1018 return -EINVAL; 1019 } 1020 1021 return count; 1022 } 1023 1024 static DEVICE_ATTR_RW(pec); 1025 1026 static int lm90_get_temp11(struct lm90_data *data, int index) 1027 { 1028 s16 temp11 = data->temp11[index]; 1029 int temp; 1030 1031 if (data->flags & LM90_HAVE_EXTENDED_TEMP) 1032 temp = temp_from_u16_adt7461(data, temp11); 1033 else if (data->kind == max6646) 1034 temp = temp_from_u16(temp11); 1035 else 1036 temp = temp_from_s16(temp11); 1037 1038 /* +16 degrees offset for temp2 for the LM99 */ 1039 if (data->kind == lm99 && index <= 2) 1040 temp += 16000; 1041 1042 return temp; 1043 } 1044 1045 static int lm90_set_temp11(struct lm90_data *data, int index, long val) 1046 { 1047 static struct reg { 1048 u8 high; 1049 u8 low; 1050 } reg[] = { 1051 [REMOTE_LOW] = { LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL }, 1052 [REMOTE_HIGH] = { LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL }, 1053 [REMOTE_OFFSET] = { LM90_REG_W_REMOTE_OFFSH, LM90_REG_W_REMOTE_OFFSL }, 1054 [REMOTE2_LOW] = { LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL }, 1055 [REMOTE2_HIGH] = { LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL } 1056 }; 1057 struct i2c_client *client = data->client; 1058 struct reg *regp = ®[index]; 1059 int err; 1060 1061 /* +16 degrees offset for temp2 for the LM99 */ 1062 if (data->kind == lm99 && index <= 2) { 1063 /* prevent integer underflow */ 1064 val = max(val, -128000l); 1065 val -= 16000; 1066 } 1067 1068 if (data->flags & LM90_HAVE_EXTENDED_TEMP) 1069 data->temp11[index] = temp_to_u16_adt7461(data, val); 1070 else if (data->kind == max6646) 1071 data->temp11[index] = temp_to_u8(val) << 8; 1072 else if (data->flags & LM90_HAVE_REM_LIMIT_EXT) 1073 data->temp11[index] = temp_to_s16(val); 1074 else 1075 data->temp11[index] = temp_to_s8(val) << 8; 1076 1077 lm90_select_remote_channel(data, index >= 3); 1078 err = i2c_smbus_write_byte_data(client, regp->high, 1079 data->temp11[index] >> 8); 1080 if (err < 0) 1081 return err; 1082 if (data->flags & LM90_HAVE_REM_LIMIT_EXT) 1083 err = i2c_smbus_write_byte_data(client, regp->low, 1084 data->temp11[index] & 0xff); 1085 1086 lm90_select_remote_channel(data, 0); 1087 return err; 1088 } 1089 1090 static int lm90_get_temp8(struct lm90_data *data, int index) 1091 { 1092 s8 temp8 = data->temp8[index]; 1093 int temp; 1094 1095 if (data->flags & LM90_HAVE_EXTENDED_TEMP) 1096 temp = temp_from_u8_adt7461(data, temp8); 1097 else if (data->kind == max6646) 1098 temp = temp_from_u8(temp8); 1099 else 1100 temp = temp_from_s8(temp8); 1101 1102 /* +16 degrees offset for temp2 for the LM99 */ 1103 if (data->kind == lm99 && index == 3) 1104 temp += 16000; 1105 1106 return temp; 1107 } 1108 1109 static int lm90_set_temp8(struct lm90_data *data, int index, long val) 1110 { 1111 static const u8 reg[TEMP8_REG_NUM] = { 1112 LM90_REG_W_LOCAL_LOW, 1113 LM90_REG_W_LOCAL_HIGH, 1114 LM90_REG_W_LOCAL_CRIT, 1115 LM90_REG_W_REMOTE_CRIT, 1116 MAX6659_REG_W_LOCAL_EMERG, 1117 MAX6659_REG_W_REMOTE_EMERG, 1118 LM90_REG_W_REMOTE_CRIT, 1119 MAX6659_REG_W_REMOTE_EMERG, 1120 }; 1121 struct i2c_client *client = data->client; 1122 int err; 1123 1124 /* +16 degrees offset for temp2 for the LM99 */ 1125 if (data->kind == lm99 && index == 3) { 1126 /* prevent integer underflow */ 1127 val = max(val, -128000l); 1128 val -= 16000; 1129 } 1130 1131 if (data->flags & LM90_HAVE_EXTENDED_TEMP) 1132 data->temp8[index] = temp_to_u8_adt7461(data, val); 1133 else if (data->kind == max6646) 1134 data->temp8[index] = temp_to_u8(val); 1135 else 1136 data->temp8[index] = temp_to_s8(val); 1137 1138 lm90_select_remote_channel(data, index >= 6); 1139 err = i2c_smbus_write_byte_data(client, reg[index], data->temp8[index]); 1140 lm90_select_remote_channel(data, 0); 1141 1142 return err; 1143 } 1144 1145 static int lm90_get_temphyst(struct lm90_data *data, int index) 1146 { 1147 int temp; 1148 1149 if (data->flags & LM90_HAVE_EXTENDED_TEMP) 1150 temp = temp_from_u8_adt7461(data, data->temp8[index]); 1151 else if (data->kind == max6646) 1152 temp = temp_from_u8(data->temp8[index]); 1153 else 1154 temp = temp_from_s8(data->temp8[index]); 1155 1156 /* +16 degrees offset for temp2 for the LM99 */ 1157 if (data->kind == lm99 && index == 3) 1158 temp += 16000; 1159 1160 return temp - temp_from_s8(data->temp_hyst); 1161 } 1162 1163 static int lm90_set_temphyst(struct lm90_data *data, long val) 1164 { 1165 struct i2c_client *client = data->client; 1166 int temp; 1167 int err; 1168 1169 if (data->flags & LM90_HAVE_EXTENDED_TEMP) 1170 temp = temp_from_u8_adt7461(data, data->temp8[LOCAL_CRIT]); 1171 else if (data->kind == max6646) 1172 temp = temp_from_u8(data->temp8[LOCAL_CRIT]); 1173 else 1174 temp = temp_from_s8(data->temp8[LOCAL_CRIT]); 1175 1176 /* prevent integer overflow/underflow */ 1177 val = clamp_val(val, -128000l, 255000l); 1178 1179 data->temp_hyst = hyst_to_reg(temp - val); 1180 err = i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST, 1181 data->temp_hyst); 1182 return err; 1183 } 1184 1185 static const u8 lm90_temp_index[3] = { 1186 LOCAL_TEMP, REMOTE_TEMP, REMOTE2_TEMP 1187 }; 1188 1189 static const u8 lm90_temp_min_index[3] = { 1190 LOCAL_LOW, REMOTE_LOW, REMOTE2_LOW 1191 }; 1192 1193 static const u8 lm90_temp_max_index[3] = { 1194 LOCAL_HIGH, REMOTE_HIGH, REMOTE2_HIGH 1195 }; 1196 1197 static const u8 lm90_temp_crit_index[3] = { 1198 LOCAL_CRIT, REMOTE_CRIT, REMOTE2_CRIT 1199 }; 1200 1201 static const u8 lm90_temp_emerg_index[3] = { 1202 LOCAL_EMERG, REMOTE_EMERG, REMOTE2_EMERG 1203 }; 1204 1205 static const u8 lm90_min_alarm_bits[3] = { 5, 3, 11 }; 1206 static const u8 lm90_max_alarm_bits[3] = { 6, 4, 12 }; 1207 static const u8 lm90_crit_alarm_bits[3] = { 0, 1, 9 }; 1208 static const u8 lm90_crit_alarm_bits_swapped[3] = { 1, 0, 9 }; 1209 static const u8 lm90_emergency_alarm_bits[3] = { 15, 13, 14 }; 1210 static const u8 lm90_fault_bits[3] = { 0, 2, 10 }; 1211 1212 static int lm90_temp_read(struct device *dev, u32 attr, int channel, long *val) 1213 { 1214 struct lm90_data *data = dev_get_drvdata(dev); 1215 int err; 1216 1217 mutex_lock(&data->update_lock); 1218 err = lm90_update_device(dev); 1219 mutex_unlock(&data->update_lock); 1220 if (err) 1221 return err; 1222 1223 switch (attr) { 1224 case hwmon_temp_input: 1225 *val = lm90_get_temp11(data, lm90_temp_index[channel]); 1226 break; 1227 case hwmon_temp_min_alarm: 1228 *val = (data->alarms >> lm90_min_alarm_bits[channel]) & 1; 1229 break; 1230 case hwmon_temp_max_alarm: 1231 *val = (data->alarms >> lm90_max_alarm_bits[channel]) & 1; 1232 break; 1233 case hwmon_temp_crit_alarm: 1234 if (data->flags & LM90_HAVE_CRIT_ALRM_SWP) 1235 *val = (data->alarms >> lm90_crit_alarm_bits_swapped[channel]) & 1; 1236 else 1237 *val = (data->alarms >> lm90_crit_alarm_bits[channel]) & 1; 1238 break; 1239 case hwmon_temp_emergency_alarm: 1240 *val = (data->alarms >> lm90_emergency_alarm_bits[channel]) & 1; 1241 break; 1242 case hwmon_temp_fault: 1243 *val = (data->alarms >> lm90_fault_bits[channel]) & 1; 1244 break; 1245 case hwmon_temp_min: 1246 if (channel == 0) 1247 *val = lm90_get_temp8(data, 1248 lm90_temp_min_index[channel]); 1249 else 1250 *val = lm90_get_temp11(data, 1251 lm90_temp_min_index[channel]); 1252 break; 1253 case hwmon_temp_max: 1254 if (channel == 0) 1255 *val = lm90_get_temp8(data, 1256 lm90_temp_max_index[channel]); 1257 else 1258 *val = lm90_get_temp11(data, 1259 lm90_temp_max_index[channel]); 1260 break; 1261 case hwmon_temp_crit: 1262 *val = lm90_get_temp8(data, lm90_temp_crit_index[channel]); 1263 break; 1264 case hwmon_temp_crit_hyst: 1265 *val = lm90_get_temphyst(data, lm90_temp_crit_index[channel]); 1266 break; 1267 case hwmon_temp_emergency: 1268 *val = lm90_get_temp8(data, lm90_temp_emerg_index[channel]); 1269 break; 1270 case hwmon_temp_emergency_hyst: 1271 *val = lm90_get_temphyst(data, lm90_temp_emerg_index[channel]); 1272 break; 1273 case hwmon_temp_offset: 1274 *val = lm90_get_temp11(data, REMOTE_OFFSET); 1275 break; 1276 default: 1277 return -EOPNOTSUPP; 1278 } 1279 return 0; 1280 } 1281 1282 static int lm90_temp_write(struct device *dev, u32 attr, int channel, long val) 1283 { 1284 struct lm90_data *data = dev_get_drvdata(dev); 1285 int err; 1286 1287 mutex_lock(&data->update_lock); 1288 1289 err = lm90_update_device(dev); 1290 if (err) 1291 goto error; 1292 1293 switch (attr) { 1294 case hwmon_temp_min: 1295 if (channel == 0) 1296 err = lm90_set_temp8(data, 1297 lm90_temp_min_index[channel], 1298 val); 1299 else 1300 err = lm90_set_temp11(data, 1301 lm90_temp_min_index[channel], 1302 val); 1303 break; 1304 case hwmon_temp_max: 1305 if (channel == 0) 1306 err = lm90_set_temp8(data, 1307 lm90_temp_max_index[channel], 1308 val); 1309 else 1310 err = lm90_set_temp11(data, 1311 lm90_temp_max_index[channel], 1312 val); 1313 break; 1314 case hwmon_temp_crit: 1315 err = lm90_set_temp8(data, lm90_temp_crit_index[channel], val); 1316 break; 1317 case hwmon_temp_crit_hyst: 1318 err = lm90_set_temphyst(data, val); 1319 break; 1320 case hwmon_temp_emergency: 1321 err = lm90_set_temp8(data, lm90_temp_emerg_index[channel], val); 1322 break; 1323 case hwmon_temp_offset: 1324 err = lm90_set_temp11(data, REMOTE_OFFSET, val); 1325 break; 1326 default: 1327 err = -EOPNOTSUPP; 1328 break; 1329 } 1330 error: 1331 mutex_unlock(&data->update_lock); 1332 1333 return err; 1334 } 1335 1336 static umode_t lm90_temp_is_visible(const void *data, u32 attr, int channel) 1337 { 1338 switch (attr) { 1339 case hwmon_temp_input: 1340 case hwmon_temp_min_alarm: 1341 case hwmon_temp_max_alarm: 1342 case hwmon_temp_crit_alarm: 1343 case hwmon_temp_emergency_alarm: 1344 case hwmon_temp_emergency_hyst: 1345 case hwmon_temp_fault: 1346 return 0444; 1347 case hwmon_temp_min: 1348 case hwmon_temp_max: 1349 case hwmon_temp_crit: 1350 case hwmon_temp_emergency: 1351 case hwmon_temp_offset: 1352 return 0644; 1353 case hwmon_temp_crit_hyst: 1354 if (channel == 0) 1355 return 0644; 1356 return 0444; 1357 default: 1358 return 0; 1359 } 1360 } 1361 1362 static int lm90_chip_read(struct device *dev, u32 attr, int channel, long *val) 1363 { 1364 struct lm90_data *data = dev_get_drvdata(dev); 1365 int err; 1366 1367 mutex_lock(&data->update_lock); 1368 err = lm90_update_device(dev); 1369 mutex_unlock(&data->update_lock); 1370 if (err) 1371 return err; 1372 1373 switch (attr) { 1374 case hwmon_chip_update_interval: 1375 *val = data->update_interval; 1376 break; 1377 case hwmon_chip_alarms: 1378 *val = data->alarms; 1379 break; 1380 default: 1381 return -EOPNOTSUPP; 1382 } 1383 1384 return 0; 1385 } 1386 1387 static int lm90_chip_write(struct device *dev, u32 attr, int channel, long val) 1388 { 1389 struct lm90_data *data = dev_get_drvdata(dev); 1390 struct i2c_client *client = data->client; 1391 int err; 1392 1393 mutex_lock(&data->update_lock); 1394 1395 err = lm90_update_device(dev); 1396 if (err) 1397 goto error; 1398 1399 switch (attr) { 1400 case hwmon_chip_update_interval: 1401 err = lm90_set_convrate(client, data, 1402 clamp_val(val, 0, 100000)); 1403 break; 1404 default: 1405 err = -EOPNOTSUPP; 1406 break; 1407 } 1408 error: 1409 mutex_unlock(&data->update_lock); 1410 1411 return err; 1412 } 1413 1414 static umode_t lm90_chip_is_visible(const void *data, u32 attr, int channel) 1415 { 1416 switch (attr) { 1417 case hwmon_chip_update_interval: 1418 return 0644; 1419 case hwmon_chip_alarms: 1420 return 0444; 1421 default: 1422 return 0; 1423 } 1424 } 1425 1426 static int lm90_read(struct device *dev, enum hwmon_sensor_types type, 1427 u32 attr, int channel, long *val) 1428 { 1429 switch (type) { 1430 case hwmon_chip: 1431 return lm90_chip_read(dev, attr, channel, val); 1432 case hwmon_temp: 1433 return lm90_temp_read(dev, attr, channel, val); 1434 default: 1435 return -EOPNOTSUPP; 1436 } 1437 } 1438 1439 static int lm90_write(struct device *dev, enum hwmon_sensor_types type, 1440 u32 attr, int channel, long val) 1441 { 1442 switch (type) { 1443 case hwmon_chip: 1444 return lm90_chip_write(dev, attr, channel, val); 1445 case hwmon_temp: 1446 return lm90_temp_write(dev, attr, channel, val); 1447 default: 1448 return -EOPNOTSUPP; 1449 } 1450 } 1451 1452 static umode_t lm90_is_visible(const void *data, enum hwmon_sensor_types type, 1453 u32 attr, int channel) 1454 { 1455 switch (type) { 1456 case hwmon_chip: 1457 return lm90_chip_is_visible(data, attr, channel); 1458 case hwmon_temp: 1459 return lm90_temp_is_visible(data, attr, channel); 1460 default: 1461 return 0; 1462 } 1463 } 1464 1465 /* Return 0 if detection is successful, -ENODEV otherwise */ 1466 static int lm90_detect(struct i2c_client *client, 1467 struct i2c_board_info *info) 1468 { 1469 struct i2c_adapter *adapter = client->adapter; 1470 int address = client->addr; 1471 const char *name = NULL; 1472 int man_id, chip_id, config1, config2, convrate; 1473 1474 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 1475 return -ENODEV; 1476 1477 /* detection and identification */ 1478 man_id = i2c_smbus_read_byte_data(client, LM90_REG_R_MAN_ID); 1479 chip_id = i2c_smbus_read_byte_data(client, LM90_REG_R_CHIP_ID); 1480 config1 = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG1); 1481 convrate = i2c_smbus_read_byte_data(client, LM90_REG_R_CONVRATE); 1482 if (man_id < 0 || chip_id < 0 || config1 < 0 || convrate < 0) 1483 return -ENODEV; 1484 1485 if (man_id == 0x01 || man_id == 0x5C || man_id == 0xA1) { 1486 config2 = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG2); 1487 if (config2 < 0) 1488 return -ENODEV; 1489 } 1490 1491 if ((address == 0x4C || address == 0x4D) 1492 && man_id == 0x01) { /* National Semiconductor */ 1493 if ((config1 & 0x2A) == 0x00 1494 && (config2 & 0xF8) == 0x00 1495 && convrate <= 0x09) { 1496 if (address == 0x4C 1497 && (chip_id & 0xF0) == 0x20) { /* LM90 */ 1498 name = "lm90"; 1499 } else 1500 if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */ 1501 name = "lm99"; 1502 dev_info(&adapter->dev, 1503 "Assuming LM99 chip at 0x%02x\n", 1504 address); 1505 dev_info(&adapter->dev, 1506 "If it is an LM89, instantiate it " 1507 "with the new_device sysfs " 1508 "interface\n"); 1509 } else 1510 if (address == 0x4C 1511 && (chip_id & 0xF0) == 0x10) { /* LM86 */ 1512 name = "lm86"; 1513 } 1514 } 1515 } else 1516 if ((address == 0x4C || address == 0x4D) 1517 && man_id == 0x41) { /* Analog Devices */ 1518 if ((chip_id & 0xF0) == 0x40 /* ADM1032 */ 1519 && (config1 & 0x3F) == 0x00 1520 && convrate <= 0x0A) { 1521 name = "adm1032"; 1522 /* 1523 * The ADM1032 supports PEC, but only if combined 1524 * transactions are not used. 1525 */ 1526 if (i2c_check_functionality(adapter, 1527 I2C_FUNC_SMBUS_BYTE)) 1528 info->flags |= I2C_CLIENT_PEC; 1529 } else 1530 if (chip_id == 0x51 /* ADT7461 */ 1531 && (config1 & 0x1B) == 0x00 1532 && convrate <= 0x0A) { 1533 name = "adt7461"; 1534 } else 1535 if (chip_id == 0x57 /* ADT7461A, NCT1008 */ 1536 && (config1 & 0x1B) == 0x00 1537 && convrate <= 0x0A) { 1538 name = "adt7461a"; 1539 } 1540 } else 1541 if (man_id == 0x4D) { /* Maxim */ 1542 int emerg, emerg2, status2; 1543 1544 /* 1545 * We read MAX6659_REG_R_REMOTE_EMERG twice, and re-read 1546 * LM90_REG_R_MAN_ID in between. If MAX6659_REG_R_REMOTE_EMERG 1547 * exists, both readings will reflect the same value. Otherwise, 1548 * the readings will be different. 1549 */ 1550 emerg = i2c_smbus_read_byte_data(client, 1551 MAX6659_REG_R_REMOTE_EMERG); 1552 man_id = i2c_smbus_read_byte_data(client, 1553 LM90_REG_R_MAN_ID); 1554 emerg2 = i2c_smbus_read_byte_data(client, 1555 MAX6659_REG_R_REMOTE_EMERG); 1556 status2 = i2c_smbus_read_byte_data(client, 1557 MAX6696_REG_R_STATUS2); 1558 if (emerg < 0 || man_id < 0 || emerg2 < 0 || status2 < 0) 1559 return -ENODEV; 1560 1561 /* 1562 * The MAX6657, MAX6658 and MAX6659 do NOT have a chip_id 1563 * register. Reading from that address will return the last 1564 * read value, which in our case is those of the man_id 1565 * register. Likewise, the config1 register seems to lack a 1566 * low nibble, so the value will be those of the previous 1567 * read, so in our case those of the man_id register. 1568 * MAX6659 has a third set of upper temperature limit registers. 1569 * Those registers also return values on MAX6657 and MAX6658, 1570 * thus the only way to detect MAX6659 is by its address. 1571 * For this reason it will be mis-detected as MAX6657 if its 1572 * address is 0x4C. 1573 */ 1574 if (chip_id == man_id 1575 && (address == 0x4C || address == 0x4D || address == 0x4E) 1576 && (config1 & 0x1F) == (man_id & 0x0F) 1577 && convrate <= 0x09) { 1578 if (address == 0x4C) 1579 name = "max6657"; 1580 else 1581 name = "max6659"; 1582 } else 1583 /* 1584 * Even though MAX6695 and MAX6696 do not have a chip ID 1585 * register, reading it returns 0x01. Bit 4 of the config1 1586 * register is unused and should return zero when read. Bit 0 of 1587 * the status2 register is unused and should return zero when 1588 * read. 1589 * 1590 * MAX6695 and MAX6696 have an additional set of temperature 1591 * limit registers. We can detect those chips by checking if 1592 * one of those registers exists. 1593 */ 1594 if (chip_id == 0x01 1595 && (config1 & 0x10) == 0x00 1596 && (status2 & 0x01) == 0x00 1597 && emerg == emerg2 1598 && convrate <= 0x07) { 1599 name = "max6696"; 1600 } else 1601 /* 1602 * The chip_id register of the MAX6680 and MAX6681 holds the 1603 * revision of the chip. The lowest bit of the config1 register 1604 * is unused and should return zero when read, so should the 1605 * second to last bit of config1 (software reset). 1606 */ 1607 if (chip_id == 0x01 1608 && (config1 & 0x03) == 0x00 1609 && convrate <= 0x07) { 1610 name = "max6680"; 1611 } else 1612 /* 1613 * The chip_id register of the MAX6646/6647/6649 holds the 1614 * revision of the chip. The lowest 6 bits of the config1 1615 * register are unused and should return zero when read. 1616 */ 1617 if (chip_id == 0x59 1618 && (config1 & 0x3f) == 0x00 1619 && convrate <= 0x07) { 1620 name = "max6646"; 1621 } else 1622 /* 1623 * The chip_id of the MAX6654 holds the revision of the chip. 1624 * The lowest 3 bits of the config1 register are unused and 1625 * should return zero when read. 1626 */ 1627 if (chip_id == 0x08 1628 && (config1 & 0x07) == 0x00 1629 && convrate <= 0x07) { 1630 name = "max6654"; 1631 } 1632 } else 1633 if (address == 0x4C 1634 && man_id == 0x5C) { /* Winbond/Nuvoton */ 1635 if ((config1 & 0x2A) == 0x00 1636 && (config2 & 0xF8) == 0x00) { 1637 if (chip_id == 0x01 /* W83L771W/G */ 1638 && convrate <= 0x09) { 1639 name = "w83l771"; 1640 } else 1641 if ((chip_id & 0xFE) == 0x10 /* W83L771AWG/ASG */ 1642 && convrate <= 0x08) { 1643 name = "w83l771"; 1644 } 1645 } 1646 } else 1647 if (address >= 0x48 && address <= 0x4F 1648 && man_id == 0xA1) { /* NXP Semiconductor/Philips */ 1649 if (chip_id == 0x00 1650 && (config1 & 0x2A) == 0x00 1651 && (config2 & 0xFE) == 0x00 1652 && convrate <= 0x09) { 1653 name = "sa56004"; 1654 } 1655 } else 1656 if ((address == 0x4C || address == 0x4D) 1657 && man_id == 0x47) { /* GMT */ 1658 if (chip_id == 0x01 /* G781 */ 1659 && (config1 & 0x3F) == 0x00 1660 && convrate <= 0x08) 1661 name = "g781"; 1662 } else 1663 if (man_id == 0x55 && chip_id == 0x00 && 1664 (config1 & 0x1B) == 0x00 && convrate <= 0x09) { 1665 int local_ext, conalert, chen, dfc; 1666 1667 local_ext = i2c_smbus_read_byte_data(client, 1668 TMP451_REG_R_LOCAL_TEMPL); 1669 conalert = i2c_smbus_read_byte_data(client, 1670 TMP451_REG_CONALERT); 1671 chen = i2c_smbus_read_byte_data(client, TMP461_REG_CHEN); 1672 dfc = i2c_smbus_read_byte_data(client, TMP461_REG_DFC); 1673 1674 if ((local_ext & 0x0F) == 0x00 && 1675 (conalert & 0xf1) == 0x01 && 1676 (chen & 0xfc) == 0x00 && 1677 (dfc & 0xfc) == 0x00) { 1678 if (address == 0x4c && !(chen & 0x03)) 1679 name = "tmp451"; 1680 else if (address >= 0x48 && address <= 0x4f) 1681 name = "tmp461"; 1682 } 1683 } 1684 1685 if (!name) { /* identification failed */ 1686 dev_dbg(&adapter->dev, 1687 "Unsupported chip at 0x%02x (man_id=0x%02X, " 1688 "chip_id=0x%02X)\n", address, man_id, chip_id); 1689 return -ENODEV; 1690 } 1691 1692 strlcpy(info->type, name, I2C_NAME_SIZE); 1693 1694 return 0; 1695 } 1696 1697 static void lm90_restore_conf(void *_data) 1698 { 1699 struct lm90_data *data = _data; 1700 struct i2c_client *client = data->client; 1701 1702 /* Restore initial configuration */ 1703 lm90_write_convrate(data, data->convrate_orig); 1704 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, 1705 data->config_orig); 1706 } 1707 1708 static int lm90_init_client(struct i2c_client *client, struct lm90_data *data) 1709 { 1710 int config, convrate; 1711 1712 convrate = lm90_read_reg(client, LM90_REG_R_CONVRATE); 1713 if (convrate < 0) 1714 return convrate; 1715 data->convrate_orig = convrate; 1716 1717 /* 1718 * Start the conversions. 1719 */ 1720 config = lm90_read_reg(client, LM90_REG_R_CONFIG1); 1721 if (config < 0) 1722 return config; 1723 data->config_orig = config; 1724 data->config = config; 1725 1726 lm90_set_convrate(client, data, 500); /* 500ms; 2Hz conversion rate */ 1727 1728 /* Check Temperature Range Select */ 1729 if (data->flags & LM90_HAVE_EXTENDED_TEMP) { 1730 if (config & 0x04) 1731 data->flags |= LM90_FLAG_ADT7461_EXT; 1732 } 1733 1734 /* 1735 * Put MAX6680/MAX8881 into extended resolution (bit 0x10, 1736 * 0.125 degree resolution) and range (0x08, extend range 1737 * to -64 degree) mode for the remote temperature sensor. 1738 */ 1739 if (data->kind == max6680) 1740 config |= 0x18; 1741 1742 /* 1743 * Put MAX6654 into extended range (0x20, extend minimum range from 1744 * 0 degrees to -64 degrees). Note that extended resolution is not 1745 * possible on the MAX6654 unless conversion rate is set to 1 Hz or 1746 * slower, which is intentionally not done by default. 1747 */ 1748 if (data->kind == max6654) 1749 config |= 0x20; 1750 1751 /* 1752 * Select external channel 0 for max6695/96 1753 */ 1754 if (data->kind == max6696) 1755 config &= ~0x08; 1756 1757 /* 1758 * Interrupt is enabled by default on reset, but it may be disabled 1759 * by bootloader, unmask it. 1760 */ 1761 if (client->irq) 1762 config &= ~0x80; 1763 1764 config &= 0xBF; /* run */ 1765 lm90_update_confreg(data, config); 1766 1767 return devm_add_action_or_reset(&client->dev, lm90_restore_conf, data); 1768 } 1769 1770 static bool lm90_is_tripped(struct i2c_client *client, u16 *status) 1771 { 1772 struct lm90_data *data = i2c_get_clientdata(client); 1773 int st, st2 = 0; 1774 1775 st = lm90_read_reg(client, LM90_REG_R_STATUS); 1776 if (st < 0) 1777 return false; 1778 1779 if (data->kind == max6696) { 1780 st2 = lm90_read_reg(client, MAX6696_REG_R_STATUS2); 1781 if (st2 < 0) 1782 return false; 1783 } 1784 1785 *status = st | (st2 << 8); 1786 1787 if ((st & 0x7f) == 0 && (st2 & 0xfe) == 0) 1788 return false; 1789 1790 if ((st & (LM90_STATUS_LLOW | LM90_STATUS_LHIGH | LM90_STATUS_LTHRM)) || 1791 (st2 & MAX6696_STATUS2_LOT2)) 1792 dev_dbg(&client->dev, 1793 "temp%d out of range, please check!\n", 1); 1794 if ((st & (LM90_STATUS_RLOW | LM90_STATUS_RHIGH | LM90_STATUS_RTHRM)) || 1795 (st2 & MAX6696_STATUS2_ROT2)) 1796 dev_dbg(&client->dev, 1797 "temp%d out of range, please check!\n", 2); 1798 if (st & LM90_STATUS_ROPEN) 1799 dev_dbg(&client->dev, 1800 "temp%d diode open, please check!\n", 2); 1801 if (st2 & (MAX6696_STATUS2_R2LOW | MAX6696_STATUS2_R2HIGH | 1802 MAX6696_STATUS2_R2THRM | MAX6696_STATUS2_R2OT2)) 1803 dev_dbg(&client->dev, 1804 "temp%d out of range, please check!\n", 3); 1805 if (st2 & MAX6696_STATUS2_R2OPEN) 1806 dev_dbg(&client->dev, 1807 "temp%d diode open, please check!\n", 3); 1808 1809 if (st & LM90_STATUS_LLOW) 1810 hwmon_notify_event(data->hwmon_dev, hwmon_temp, 1811 hwmon_temp_min_alarm, 0); 1812 if (st & LM90_STATUS_RLOW) 1813 hwmon_notify_event(data->hwmon_dev, hwmon_temp, 1814 hwmon_temp_min_alarm, 1); 1815 if (st2 & MAX6696_STATUS2_R2LOW) 1816 hwmon_notify_event(data->hwmon_dev, hwmon_temp, 1817 hwmon_temp_min_alarm, 2); 1818 if (st & LM90_STATUS_LHIGH) 1819 hwmon_notify_event(data->hwmon_dev, hwmon_temp, 1820 hwmon_temp_max_alarm, 0); 1821 if (st & LM90_STATUS_RHIGH) 1822 hwmon_notify_event(data->hwmon_dev, hwmon_temp, 1823 hwmon_temp_max_alarm, 1); 1824 if (st2 & MAX6696_STATUS2_R2HIGH) 1825 hwmon_notify_event(data->hwmon_dev, hwmon_temp, 1826 hwmon_temp_max_alarm, 2); 1827 1828 return true; 1829 } 1830 1831 static irqreturn_t lm90_irq_thread(int irq, void *dev_id) 1832 { 1833 struct i2c_client *client = dev_id; 1834 u16 status; 1835 1836 if (lm90_is_tripped(client, &status)) 1837 return IRQ_HANDLED; 1838 else 1839 return IRQ_NONE; 1840 } 1841 1842 static void lm90_remove_pec(void *dev) 1843 { 1844 device_remove_file(dev, &dev_attr_pec); 1845 } 1846 1847 static void lm90_regulator_disable(void *regulator) 1848 { 1849 regulator_disable(regulator); 1850 } 1851 1852 1853 static const struct hwmon_ops lm90_ops = { 1854 .is_visible = lm90_is_visible, 1855 .read = lm90_read, 1856 .write = lm90_write, 1857 }; 1858 1859 static int lm90_probe(struct i2c_client *client) 1860 { 1861 struct device *dev = &client->dev; 1862 struct i2c_adapter *adapter = client->adapter; 1863 struct hwmon_channel_info *info; 1864 struct regulator *regulator; 1865 struct device *hwmon_dev; 1866 struct lm90_data *data; 1867 int err; 1868 1869 regulator = devm_regulator_get(dev, "vcc"); 1870 if (IS_ERR(regulator)) 1871 return PTR_ERR(regulator); 1872 1873 err = regulator_enable(regulator); 1874 if (err < 0) { 1875 dev_err(dev, "Failed to enable regulator: %d\n", err); 1876 return err; 1877 } 1878 1879 err = devm_add_action_or_reset(dev, lm90_regulator_disable, regulator); 1880 if (err) 1881 return err; 1882 1883 data = devm_kzalloc(dev, sizeof(struct lm90_data), GFP_KERNEL); 1884 if (!data) 1885 return -ENOMEM; 1886 1887 data->client = client; 1888 i2c_set_clientdata(client, data); 1889 mutex_init(&data->update_lock); 1890 1891 /* Set the device type */ 1892 if (client->dev.of_node) 1893 data->kind = (enum chips)of_device_get_match_data(&client->dev); 1894 else 1895 data->kind = i2c_match_id(lm90_id, client)->driver_data; 1896 if (data->kind == adm1032) { 1897 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) 1898 client->flags &= ~I2C_CLIENT_PEC; 1899 } 1900 1901 /* 1902 * Different devices have different alarm bits triggering the 1903 * ALERT# output 1904 */ 1905 data->alert_alarms = lm90_params[data->kind].alert_alarms; 1906 1907 /* Set chip capabilities */ 1908 data->flags = lm90_params[data->kind].flags; 1909 1910 data->chip.ops = &lm90_ops; 1911 data->chip.info = data->info; 1912 1913 data->info[0] = HWMON_CHANNEL_INFO(chip, 1914 HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL | HWMON_C_ALARMS); 1915 data->info[1] = &data->temp_info; 1916 1917 info = &data->temp_info; 1918 info->type = hwmon_temp; 1919 info->config = data->channel_config; 1920 1921 data->channel_config[0] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | 1922 HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM; 1923 data->channel_config[1] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | 1924 HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM | HWMON_T_FAULT; 1925 1926 if (data->flags & LM90_HAVE_CRIT) { 1927 data->channel_config[0] |= HWMON_T_CRIT | HWMON_T_CRIT_ALARM | HWMON_T_CRIT_HYST; 1928 data->channel_config[1] |= HWMON_T_CRIT | HWMON_T_CRIT_ALARM | HWMON_T_CRIT_HYST; 1929 } 1930 1931 if (data->flags & LM90_HAVE_OFFSET) 1932 data->channel_config[1] |= HWMON_T_OFFSET; 1933 1934 if (data->flags & LM90_HAVE_EMERGENCY) { 1935 data->channel_config[0] |= HWMON_T_EMERGENCY | 1936 HWMON_T_EMERGENCY_HYST; 1937 data->channel_config[1] |= HWMON_T_EMERGENCY | 1938 HWMON_T_EMERGENCY_HYST; 1939 } 1940 1941 if (data->flags & LM90_HAVE_EMERGENCY_ALARM) { 1942 data->channel_config[0] |= HWMON_T_EMERGENCY_ALARM; 1943 data->channel_config[1] |= HWMON_T_EMERGENCY_ALARM; 1944 } 1945 1946 if (data->flags & LM90_HAVE_TEMP3) { 1947 data->channel_config[2] = HWMON_T_INPUT | 1948 HWMON_T_MIN | HWMON_T_MAX | 1949 HWMON_T_CRIT | HWMON_T_CRIT_HYST | 1950 HWMON_T_EMERGENCY | HWMON_T_EMERGENCY_HYST | 1951 HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM | 1952 HWMON_T_CRIT_ALARM | HWMON_T_EMERGENCY_ALARM | 1953 HWMON_T_FAULT; 1954 } 1955 1956 data->reg_local_ext = lm90_params[data->kind].reg_local_ext; 1957 1958 /* Set maximum conversion rate */ 1959 data->max_convrate = lm90_params[data->kind].max_convrate; 1960 1961 /* Initialize the LM90 chip */ 1962 err = lm90_init_client(client, data); 1963 if (err < 0) { 1964 dev_err(dev, "Failed to initialize device\n"); 1965 return err; 1966 } 1967 1968 /* 1969 * The 'pec' attribute is attached to the i2c device and thus created 1970 * separately. 1971 */ 1972 if (client->flags & I2C_CLIENT_PEC) { 1973 err = device_create_file(dev, &dev_attr_pec); 1974 if (err) 1975 return err; 1976 err = devm_add_action_or_reset(dev, lm90_remove_pec, dev); 1977 if (err) 1978 return err; 1979 } 1980 1981 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, 1982 data, &data->chip, 1983 NULL); 1984 if (IS_ERR(hwmon_dev)) 1985 return PTR_ERR(hwmon_dev); 1986 1987 data->hwmon_dev = hwmon_dev; 1988 1989 if (client->irq) { 1990 dev_dbg(dev, "IRQ: %d\n", client->irq); 1991 err = devm_request_threaded_irq(dev, client->irq, 1992 NULL, lm90_irq_thread, 1993 IRQF_ONESHOT, "lm90", client); 1994 if (err < 0) { 1995 dev_err(dev, "cannot request IRQ %d\n", client->irq); 1996 return err; 1997 } 1998 } 1999 2000 return 0; 2001 } 2002 2003 static void lm90_alert(struct i2c_client *client, enum i2c_alert_protocol type, 2004 unsigned int flag) 2005 { 2006 u16 alarms; 2007 2008 if (type != I2C_PROTOCOL_SMBUS_ALERT) 2009 return; 2010 2011 if (lm90_is_tripped(client, &alarms)) { 2012 /* 2013 * Disable ALERT# output, because these chips don't implement 2014 * SMBus alert correctly; they should only hold the alert line 2015 * low briefly. 2016 */ 2017 struct lm90_data *data = i2c_get_clientdata(client); 2018 2019 if ((data->flags & LM90_HAVE_BROKEN_ALERT) && 2020 (alarms & data->alert_alarms)) { 2021 dev_dbg(&client->dev, "Disabling ALERT#\n"); 2022 lm90_update_confreg(data, data->config | 0x80); 2023 } 2024 } else { 2025 dev_dbg(&client->dev, "Everything OK\n"); 2026 } 2027 } 2028 2029 static int __maybe_unused lm90_suspend(struct device *dev) 2030 { 2031 struct lm90_data *data = dev_get_drvdata(dev); 2032 struct i2c_client *client = data->client; 2033 2034 if (client->irq) 2035 disable_irq(client->irq); 2036 2037 return 0; 2038 } 2039 2040 static int __maybe_unused lm90_resume(struct device *dev) 2041 { 2042 struct lm90_data *data = dev_get_drvdata(dev); 2043 struct i2c_client *client = data->client; 2044 2045 if (client->irq) 2046 enable_irq(client->irq); 2047 2048 return 0; 2049 } 2050 2051 static SIMPLE_DEV_PM_OPS(lm90_pm_ops, lm90_suspend, lm90_resume); 2052 2053 static struct i2c_driver lm90_driver = { 2054 .class = I2C_CLASS_HWMON, 2055 .driver = { 2056 .name = "lm90", 2057 .of_match_table = of_match_ptr(lm90_of_match), 2058 .pm = &lm90_pm_ops, 2059 }, 2060 .probe_new = lm90_probe, 2061 .alert = lm90_alert, 2062 .id_table = lm90_id, 2063 .detect = lm90_detect, 2064 .address_list = normal_i2c, 2065 }; 2066 2067 module_i2c_driver(lm90_driver); 2068 2069 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>"); 2070 MODULE_DESCRIPTION("LM90/ADM1032 driver"); 2071 MODULE_LICENSE("GPL"); 2072