1 /* 2 * lm90.c - Part of lm_sensors, Linux kernel modules for hardware 3 * monitoring 4 * Copyright (C) 2003-2010 Jean Delvare <jdelvare@suse.de> 5 * 6 * Based on the lm83 driver. The LM90 is a sensor chip made by National 7 * Semiconductor. It reports up to two temperatures (its own plus up to 8 * one external one) with a 0.125 deg resolution (1 deg for local 9 * temperature) and a 3-4 deg accuracy. 10 * 11 * This driver also supports the LM89 and LM99, two other sensor chips 12 * made by National Semiconductor. Both have an increased remote 13 * temperature measurement accuracy (1 degree), and the LM99 14 * additionally shifts remote temperatures (measured and limits) by 16 15 * degrees, which allows for higher temperatures measurement. 16 * Note that there is no way to differentiate between both chips. 17 * When device is auto-detected, the driver will assume an LM99. 18 * 19 * This driver also supports the LM86, another sensor chip made by 20 * National Semiconductor. It is exactly similar to the LM90 except it 21 * has a higher accuracy. 22 * 23 * This driver also supports the ADM1032, a sensor chip made by Analog 24 * Devices. That chip is similar to the LM90, with a few differences 25 * that are not handled by this driver. Among others, it has a higher 26 * accuracy than the LM90, much like the LM86 does. 27 * 28 * This driver also supports the MAX6657, MAX6658 and MAX6659 sensor 29 * chips made by Maxim. These chips are similar to the LM86. 30 * Note that there is no easy way to differentiate between the three 31 * variants. We use the device address to detect MAX6659, which will result 32 * in a detection as max6657 if it is on address 0x4c. The extra address 33 * and features of the MAX6659 are only supported if the chip is configured 34 * explicitly as max6659, or if its address is not 0x4c. 35 * These chips lack the remote temperature offset feature. 36 * 37 * This driver also supports the MAX6646, MAX6647, MAX6648, MAX6649 and 38 * MAX6692 chips made by Maxim. These are again similar to the LM86, 39 * but they use unsigned temperature values and can report temperatures 40 * from 0 to 145 degrees. 41 * 42 * This driver also supports the MAX6680 and MAX6681, two other sensor 43 * chips made by Maxim. These are quite similar to the other Maxim 44 * chips. The MAX6680 and MAX6681 only differ in the pinout so they can 45 * be treated identically. 46 * 47 * This driver also supports the MAX6695 and MAX6696, two other sensor 48 * chips made by Maxim. These are also quite similar to other Maxim 49 * chips, but support three temperature sensors instead of two. MAX6695 50 * and MAX6696 only differ in the pinout so they can be treated identically. 51 * 52 * This driver also supports ADT7461 and ADT7461A from Analog Devices as well as 53 * NCT1008 from ON Semiconductor. The chips are supported in both compatibility 54 * and extended mode. They are mostly compatible with LM90 except for a data 55 * format difference for the temperature value registers. 56 * 57 * This driver also supports the SA56004 from Philips. This device is 58 * pin-compatible with the LM86, the ED/EDP parts are also address-compatible. 59 * 60 * This driver also supports the G781 from GMT. This device is compatible 61 * with the ADM1032. 62 * 63 * This driver also supports TMP451 from Texas Instruments. This device is 64 * supported in both compatibility and extended mode. It's mostly compatible 65 * with ADT7461 except for local temperature low byte register and max 66 * conversion rate. 67 * 68 * Since the LM90 was the first chipset supported by this driver, most 69 * comments will refer to this chipset, but are actually general and 70 * concern all supported chipsets, unless mentioned otherwise. 71 * 72 * This program is free software; you can redistribute it and/or modify 73 * it under the terms of the GNU General Public License as published by 74 * the Free Software Foundation; either version 2 of the License, or 75 * (at your option) any later version. 76 * 77 * This program is distributed in the hope that it will be useful, 78 * but WITHOUT ANY WARRANTY; without even the implied warranty of 79 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 80 * GNU General Public License for more details. 81 * 82 * You should have received a copy of the GNU General Public License 83 * along with this program; if not, write to the Free Software 84 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 85 */ 86 87 #include <linux/module.h> 88 #include <linux/init.h> 89 #include <linux/slab.h> 90 #include <linux/jiffies.h> 91 #include <linux/i2c.h> 92 #include <linux/hwmon.h> 93 #include <linux/err.h> 94 #include <linux/mutex.h> 95 #include <linux/of_device.h> 96 #include <linux/sysfs.h> 97 #include <linux/interrupt.h> 98 #include <linux/regulator/consumer.h> 99 100 /* 101 * Addresses to scan 102 * Address is fully defined internally and cannot be changed except for 103 * MAX6659, MAX6680 and MAX6681. 104 * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, ADT7461A, MAX6649, 105 * MAX6657, MAX6658, NCT1008 and W83L771 have address 0x4c. 106 * ADM1032-2, ADT7461-2, ADT7461A-2, LM89-1, LM99-1, MAX6646, and NCT1008D 107 * have address 0x4d. 108 * MAX6647 has address 0x4e. 109 * MAX6659 can have address 0x4c, 0x4d or 0x4e. 110 * MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 111 * 0x4c, 0x4d or 0x4e. 112 * SA56004 can have address 0x48 through 0x4F. 113 */ 114 115 static const unsigned short normal_i2c[] = { 116 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 117 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; 118 119 enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680, 120 max6646, w83l771, max6696, sa56004, g781, tmp451 }; 121 122 /* 123 * The LM90 registers 124 */ 125 126 #define LM90_REG_R_MAN_ID 0xFE 127 #define LM90_REG_R_CHIP_ID 0xFF 128 #define LM90_REG_R_CONFIG1 0x03 129 #define LM90_REG_W_CONFIG1 0x09 130 #define LM90_REG_R_CONFIG2 0xBF 131 #define LM90_REG_W_CONFIG2 0xBF 132 #define LM90_REG_R_CONVRATE 0x04 133 #define LM90_REG_W_CONVRATE 0x0A 134 #define LM90_REG_R_STATUS 0x02 135 #define LM90_REG_R_LOCAL_TEMP 0x00 136 #define LM90_REG_R_LOCAL_HIGH 0x05 137 #define LM90_REG_W_LOCAL_HIGH 0x0B 138 #define LM90_REG_R_LOCAL_LOW 0x06 139 #define LM90_REG_W_LOCAL_LOW 0x0C 140 #define LM90_REG_R_LOCAL_CRIT 0x20 141 #define LM90_REG_W_LOCAL_CRIT 0x20 142 #define LM90_REG_R_REMOTE_TEMPH 0x01 143 #define LM90_REG_R_REMOTE_TEMPL 0x10 144 #define LM90_REG_R_REMOTE_OFFSH 0x11 145 #define LM90_REG_W_REMOTE_OFFSH 0x11 146 #define LM90_REG_R_REMOTE_OFFSL 0x12 147 #define LM90_REG_W_REMOTE_OFFSL 0x12 148 #define LM90_REG_R_REMOTE_HIGHH 0x07 149 #define LM90_REG_W_REMOTE_HIGHH 0x0D 150 #define LM90_REG_R_REMOTE_HIGHL 0x13 151 #define LM90_REG_W_REMOTE_HIGHL 0x13 152 #define LM90_REG_R_REMOTE_LOWH 0x08 153 #define LM90_REG_W_REMOTE_LOWH 0x0E 154 #define LM90_REG_R_REMOTE_LOWL 0x14 155 #define LM90_REG_W_REMOTE_LOWL 0x14 156 #define LM90_REG_R_REMOTE_CRIT 0x19 157 #define LM90_REG_W_REMOTE_CRIT 0x19 158 #define LM90_REG_R_TCRIT_HYST 0x21 159 #define LM90_REG_W_TCRIT_HYST 0x21 160 161 /* MAX6646/6647/6649/6657/6658/6659/6695/6696 registers */ 162 163 #define MAX6657_REG_R_LOCAL_TEMPL 0x11 164 #define MAX6696_REG_R_STATUS2 0x12 165 #define MAX6659_REG_R_REMOTE_EMERG 0x16 166 #define MAX6659_REG_W_REMOTE_EMERG 0x16 167 #define MAX6659_REG_R_LOCAL_EMERG 0x17 168 #define MAX6659_REG_W_LOCAL_EMERG 0x17 169 170 /* SA56004 registers */ 171 172 #define SA56004_REG_R_LOCAL_TEMPL 0x22 173 174 #define LM90_MAX_CONVRATE_MS 16000 /* Maximum conversion rate in ms */ 175 176 /* TMP451 registers */ 177 #define TMP451_REG_R_LOCAL_TEMPL 0x15 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 */ 190 191 /* LM90 status */ 192 #define LM90_STATUS_LTHRM (1 << 0) /* local THERM limit tripped */ 193 #define LM90_STATUS_RTHRM (1 << 1) /* remote THERM limit tripped */ 194 #define LM90_STATUS_ROPEN (1 << 2) /* remote is an open circuit */ 195 #define LM90_STATUS_RLOW (1 << 3) /* remote low temp limit tripped */ 196 #define LM90_STATUS_RHIGH (1 << 4) /* remote high temp limit tripped */ 197 #define LM90_STATUS_LLOW (1 << 5) /* local low temp limit tripped */ 198 #define LM90_STATUS_LHIGH (1 << 6) /* local high temp limit tripped */ 199 200 #define MAX6696_STATUS2_R2THRM (1 << 1) /* remote2 THERM limit tripped */ 201 #define MAX6696_STATUS2_R2OPEN (1 << 2) /* remote2 is an open circuit */ 202 #define MAX6696_STATUS2_R2LOW (1 << 3) /* remote2 low temp limit tripped */ 203 #define MAX6696_STATUS2_R2HIGH (1 << 4) /* remote2 high temp limit tripped */ 204 #define MAX6696_STATUS2_ROT2 (1 << 5) /* remote emergency limit tripped */ 205 #define MAX6696_STATUS2_R2OT2 (1 << 6) /* remote2 emergency limit tripped */ 206 #define MAX6696_STATUS2_LOT2 (1 << 7) /* local emergency limit tripped */ 207 208 /* 209 * Driver data (common to all clients) 210 */ 211 212 static const struct i2c_device_id lm90_id[] = { 213 { "adm1032", adm1032 }, 214 { "adt7461", adt7461 }, 215 { "adt7461a", adt7461 }, 216 { "g781", g781 }, 217 { "lm90", lm90 }, 218 { "lm86", lm86 }, 219 { "lm89", lm86 }, 220 { "lm99", lm99 }, 221 { "max6646", max6646 }, 222 { "max6647", max6646 }, 223 { "max6649", max6646 }, 224 { "max6657", max6657 }, 225 { "max6658", max6657 }, 226 { "max6659", max6659 }, 227 { "max6680", max6680 }, 228 { "max6681", max6680 }, 229 { "max6695", max6696 }, 230 { "max6696", max6696 }, 231 { "nct1008", adt7461 }, 232 { "w83l771", w83l771 }, 233 { "sa56004", sa56004 }, 234 { "tmp451", tmp451 }, 235 { } 236 }; 237 MODULE_DEVICE_TABLE(i2c, lm90_id); 238 239 static const struct of_device_id lm90_of_match[] = { 240 { 241 .compatible = "adi,adm1032", 242 .data = (void *)adm1032 243 }, 244 { 245 .compatible = "adi,adt7461", 246 .data = (void *)adt7461 247 }, 248 { 249 .compatible = "adi,adt7461a", 250 .data = (void *)adt7461 251 }, 252 { 253 .compatible = "gmt,g781", 254 .data = (void *)g781 255 }, 256 { 257 .compatible = "national,lm90", 258 .data = (void *)lm90 259 }, 260 { 261 .compatible = "national,lm86", 262 .data = (void *)lm86 263 }, 264 { 265 .compatible = "national,lm89", 266 .data = (void *)lm86 267 }, 268 { 269 .compatible = "national,lm99", 270 .data = (void *)lm99 271 }, 272 { 273 .compatible = "dallas,max6646", 274 .data = (void *)max6646 275 }, 276 { 277 .compatible = "dallas,max6647", 278 .data = (void *)max6646 279 }, 280 { 281 .compatible = "dallas,max6649", 282 .data = (void *)max6646 283 }, 284 { 285 .compatible = "dallas,max6657", 286 .data = (void *)max6657 287 }, 288 { 289 .compatible = "dallas,max6658", 290 .data = (void *)max6657 291 }, 292 { 293 .compatible = "dallas,max6659", 294 .data = (void *)max6659 295 }, 296 { 297 .compatible = "dallas,max6680", 298 .data = (void *)max6680 299 }, 300 { 301 .compatible = "dallas,max6681", 302 .data = (void *)max6680 303 }, 304 { 305 .compatible = "dallas,max6695", 306 .data = (void *)max6696 307 }, 308 { 309 .compatible = "dallas,max6696", 310 .data = (void *)max6696 311 }, 312 { 313 .compatible = "onnn,nct1008", 314 .data = (void *)adt7461 315 }, 316 { 317 .compatible = "winbond,w83l771", 318 .data = (void *)w83l771 319 }, 320 { 321 .compatible = "nxp,sa56004", 322 .data = (void *)sa56004 323 }, 324 { 325 .compatible = "ti,tmp451", 326 .data = (void *)tmp451 327 }, 328 { }, 329 }; 330 MODULE_DEVICE_TABLE(of, lm90_of_match); 331 332 /* 333 * chip type specific parameters 334 */ 335 struct lm90_params { 336 u32 flags; /* Capabilities */ 337 u16 alert_alarms; /* Which alarm bits trigger ALERT# */ 338 /* Upper 8 bits for max6695/96 */ 339 u8 max_convrate; /* Maximum conversion rate register value */ 340 u8 reg_local_ext; /* Extended local temp register (optional) */ 341 }; 342 343 static const struct lm90_params lm90_params[] = { 344 [adm1032] = { 345 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT 346 | LM90_HAVE_BROKEN_ALERT, 347 .alert_alarms = 0x7c, 348 .max_convrate = 10, 349 }, 350 [adt7461] = { 351 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT 352 | LM90_HAVE_BROKEN_ALERT, 353 .alert_alarms = 0x7c, 354 .max_convrate = 10, 355 }, 356 [g781] = { 357 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT 358 | LM90_HAVE_BROKEN_ALERT, 359 .alert_alarms = 0x7c, 360 .max_convrate = 8, 361 }, 362 [lm86] = { 363 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT, 364 .alert_alarms = 0x7b, 365 .max_convrate = 9, 366 }, 367 [lm90] = { 368 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT, 369 .alert_alarms = 0x7b, 370 .max_convrate = 9, 371 }, 372 [lm99] = { 373 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT, 374 .alert_alarms = 0x7b, 375 .max_convrate = 9, 376 }, 377 [max6646] = { 378 .alert_alarms = 0x7c, 379 .max_convrate = 6, 380 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL, 381 }, 382 [max6657] = { 383 .alert_alarms = 0x7c, 384 .max_convrate = 8, 385 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL, 386 }, 387 [max6659] = { 388 .flags = LM90_HAVE_EMERGENCY, 389 .alert_alarms = 0x7c, 390 .max_convrate = 8, 391 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL, 392 }, 393 [max6680] = { 394 .flags = LM90_HAVE_OFFSET, 395 .alert_alarms = 0x7c, 396 .max_convrate = 7, 397 }, 398 [max6696] = { 399 .flags = LM90_HAVE_EMERGENCY 400 | LM90_HAVE_EMERGENCY_ALARM | LM90_HAVE_TEMP3, 401 .alert_alarms = 0x1c7c, 402 .max_convrate = 6, 403 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL, 404 }, 405 [w83l771] = { 406 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT, 407 .alert_alarms = 0x7c, 408 .max_convrate = 8, 409 }, 410 [sa56004] = { 411 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT, 412 .alert_alarms = 0x7b, 413 .max_convrate = 9, 414 .reg_local_ext = SA56004_REG_R_LOCAL_TEMPL, 415 }, 416 [tmp451] = { 417 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT 418 | LM90_HAVE_BROKEN_ALERT, 419 .alert_alarms = 0x7c, 420 .max_convrate = 9, 421 .reg_local_ext = TMP451_REG_R_LOCAL_TEMPL, 422 }, 423 }; 424 425 /* 426 * TEMP8 register index 427 */ 428 enum lm90_temp8_reg_index { 429 LOCAL_LOW = 0, 430 LOCAL_HIGH, 431 LOCAL_CRIT, 432 REMOTE_CRIT, 433 LOCAL_EMERG, /* max6659 and max6695/96 */ 434 REMOTE_EMERG, /* max6659 and max6695/96 */ 435 REMOTE2_CRIT, /* max6695/96 only */ 436 REMOTE2_EMERG, /* max6695/96 only */ 437 TEMP8_REG_NUM 438 }; 439 440 /* 441 * TEMP11 register index 442 */ 443 enum lm90_temp11_reg_index { 444 REMOTE_TEMP = 0, 445 REMOTE_LOW, 446 REMOTE_HIGH, 447 REMOTE_OFFSET, /* except max6646, max6657/58/59, and max6695/96 */ 448 LOCAL_TEMP, 449 REMOTE2_TEMP, /* max6695/96 only */ 450 REMOTE2_LOW, /* max6695/96 only */ 451 REMOTE2_HIGH, /* max6695/96 only */ 452 TEMP11_REG_NUM 453 }; 454 455 /* 456 * Client data (each client gets its own) 457 */ 458 459 struct lm90_data { 460 struct i2c_client *client; 461 u32 channel_config[4]; 462 struct hwmon_channel_info temp_info; 463 const struct hwmon_channel_info *info[3]; 464 struct hwmon_chip_info chip; 465 struct mutex update_lock; 466 bool valid; /* true if register values are valid */ 467 unsigned long last_updated; /* in jiffies */ 468 int kind; 469 u32 flags; 470 471 unsigned int update_interval; /* in milliseconds */ 472 473 u8 config_orig; /* Original configuration register value */ 474 u8 convrate_orig; /* Original conversion rate register value */ 475 u16 alert_alarms; /* Which alarm bits trigger ALERT# */ 476 /* Upper 8 bits for max6695/96 */ 477 u8 max_convrate; /* Maximum conversion rate */ 478 u8 reg_local_ext; /* local extension register offset */ 479 480 /* registers values */ 481 s8 temp8[TEMP8_REG_NUM]; 482 s16 temp11[TEMP11_REG_NUM]; 483 u8 temp_hyst; 484 u16 alarms; /* bitvector (upper 8 bits for max6695/96) */ 485 }; 486 487 /* 488 * Support functions 489 */ 490 491 /* 492 * The ADM1032 supports PEC but not on write byte transactions, so we need 493 * to explicitly ask for a transaction without PEC. 494 */ 495 static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value) 496 { 497 return i2c_smbus_xfer(client->adapter, client->addr, 498 client->flags & ~I2C_CLIENT_PEC, 499 I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL); 500 } 501 502 /* 503 * It is assumed that client->update_lock is held (unless we are in 504 * detection or initialization steps). This matters when PEC is enabled, 505 * because we don't want the address pointer to change between the write 506 * byte and the read byte transactions. 507 */ 508 static int lm90_read_reg(struct i2c_client *client, u8 reg) 509 { 510 int err; 511 512 if (client->flags & I2C_CLIENT_PEC) { 513 err = adm1032_write_byte(client, reg); 514 if (err >= 0) 515 err = i2c_smbus_read_byte(client); 516 } else 517 err = i2c_smbus_read_byte_data(client, reg); 518 519 return err; 520 } 521 522 static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl) 523 { 524 int oldh, newh, l; 525 526 /* 527 * There is a trick here. We have to read two registers to have the 528 * sensor temperature, but we have to beware a conversion could occur 529 * between the readings. The datasheet says we should either use 530 * the one-shot conversion register, which we don't want to do 531 * (disables hardware monitoring) or monitor the busy bit, which is 532 * impossible (we can't read the values and monitor that bit at the 533 * exact same time). So the solution used here is to read the high 534 * byte once, then the low byte, then the high byte again. If the new 535 * high byte matches the old one, then we have a valid reading. Else 536 * we have to read the low byte again, and now we believe we have a 537 * correct reading. 538 */ 539 oldh = lm90_read_reg(client, regh); 540 if (oldh < 0) 541 return oldh; 542 l = lm90_read_reg(client, regl); 543 if (l < 0) 544 return l; 545 newh = lm90_read_reg(client, regh); 546 if (newh < 0) 547 return newh; 548 if (oldh != newh) { 549 l = lm90_read_reg(client, regl); 550 if (l < 0) 551 return l; 552 } 553 return (newh << 8) | l; 554 } 555 556 /* 557 * client->update_lock must be held when calling this function (unless we are 558 * in detection or initialization steps), and while a remote channel other 559 * than channel 0 is selected. Also, calling code must make sure to re-select 560 * external channel 0 before releasing the lock. This is necessary because 561 * various registers have different meanings as a result of selecting a 562 * non-default remote channel. 563 */ 564 static inline int lm90_select_remote_channel(struct i2c_client *client, 565 struct lm90_data *data, 566 int channel) 567 { 568 int config; 569 570 if (data->kind == max6696) { 571 config = lm90_read_reg(client, LM90_REG_R_CONFIG1); 572 if (config < 0) 573 return config; 574 config &= ~0x08; 575 if (channel) 576 config |= 0x08; 577 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, 578 config); 579 } 580 return 0; 581 } 582 583 /* 584 * Set conversion rate. 585 * client->update_lock must be held when calling this function (unless we are 586 * in detection or initialization steps). 587 */ 588 static int lm90_set_convrate(struct i2c_client *client, struct lm90_data *data, 589 unsigned int interval) 590 { 591 unsigned int update_interval; 592 int i, err; 593 594 /* Shift calculations to avoid rounding errors */ 595 interval <<= 6; 596 597 /* find the nearest update rate */ 598 for (i = 0, update_interval = LM90_MAX_CONVRATE_MS << 6; 599 i < data->max_convrate; i++, update_interval >>= 1) 600 if (interval >= update_interval * 3 / 4) 601 break; 602 603 err = i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, i); 604 data->update_interval = DIV_ROUND_CLOSEST(update_interval, 64); 605 return err; 606 } 607 608 static int lm90_update_limits(struct device *dev) 609 { 610 struct lm90_data *data = dev_get_drvdata(dev); 611 struct i2c_client *client = data->client; 612 int val; 613 614 val = lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT); 615 if (val < 0) 616 return val; 617 data->temp8[LOCAL_CRIT] = val; 618 619 val = lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT); 620 if (val < 0) 621 return val; 622 data->temp8[REMOTE_CRIT] = val; 623 624 val = lm90_read_reg(client, LM90_REG_R_TCRIT_HYST); 625 if (val < 0) 626 return val; 627 data->temp_hyst = val; 628 629 val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH); 630 if (val < 0) 631 return val; 632 data->temp11[REMOTE_LOW] = val << 8; 633 634 if (data->flags & LM90_HAVE_REM_LIMIT_EXT) { 635 val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL); 636 if (val < 0) 637 return val; 638 data->temp11[REMOTE_LOW] |= val; 639 } 640 641 val = lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH); 642 if (val < 0) 643 return val; 644 data->temp11[REMOTE_HIGH] = val << 8; 645 646 if (data->flags & LM90_HAVE_REM_LIMIT_EXT) { 647 val = lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL); 648 if (val < 0) 649 return val; 650 data->temp11[REMOTE_HIGH] |= val; 651 } 652 653 if (data->flags & LM90_HAVE_OFFSET) { 654 val = lm90_read16(client, LM90_REG_R_REMOTE_OFFSH, 655 LM90_REG_R_REMOTE_OFFSL); 656 if (val < 0) 657 return val; 658 data->temp11[REMOTE_OFFSET] = val; 659 } 660 661 if (data->flags & LM90_HAVE_EMERGENCY) { 662 val = lm90_read_reg(client, MAX6659_REG_R_LOCAL_EMERG); 663 if (val < 0) 664 return val; 665 data->temp8[LOCAL_EMERG] = val; 666 667 val = lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG); 668 if (val < 0) 669 return val; 670 data->temp8[REMOTE_EMERG] = val; 671 } 672 673 if (data->kind == max6696) { 674 val = lm90_select_remote_channel(client, data, 1); 675 if (val < 0) 676 return val; 677 678 val = lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT); 679 if (val < 0) 680 return val; 681 data->temp8[REMOTE2_CRIT] = val; 682 683 val = lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG); 684 if (val < 0) 685 return val; 686 data->temp8[REMOTE2_EMERG] = val; 687 688 val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH); 689 if (val < 0) 690 return val; 691 data->temp11[REMOTE2_LOW] = val << 8; 692 693 val = lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH); 694 if (val < 0) 695 return val; 696 data->temp11[REMOTE2_HIGH] = val << 8; 697 698 lm90_select_remote_channel(client, data, 0); 699 } 700 701 return 0; 702 } 703 704 static int lm90_update_device(struct device *dev) 705 { 706 struct lm90_data *data = dev_get_drvdata(dev); 707 struct i2c_client *client = data->client; 708 unsigned long next_update; 709 int val; 710 711 if (!data->valid) { 712 val = lm90_update_limits(dev); 713 if (val < 0) 714 return val; 715 } 716 717 next_update = data->last_updated + 718 msecs_to_jiffies(data->update_interval); 719 if (time_after(jiffies, next_update) || !data->valid) { 720 dev_dbg(&client->dev, "Updating lm90 data.\n"); 721 722 data->valid = false; 723 724 val = lm90_read_reg(client, LM90_REG_R_LOCAL_LOW); 725 if (val < 0) 726 return val; 727 data->temp8[LOCAL_LOW] = val; 728 729 val = lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH); 730 if (val < 0) 731 return val; 732 data->temp8[LOCAL_HIGH] = val; 733 734 if (data->reg_local_ext) { 735 val = lm90_read16(client, LM90_REG_R_LOCAL_TEMP, 736 data->reg_local_ext); 737 if (val < 0) 738 return val; 739 data->temp11[LOCAL_TEMP] = val; 740 } else { 741 val = lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP); 742 if (val < 0) 743 return val; 744 data->temp11[LOCAL_TEMP] = val << 8; 745 } 746 val = lm90_read16(client, LM90_REG_R_REMOTE_TEMPH, 747 LM90_REG_R_REMOTE_TEMPL); 748 if (val < 0) 749 return val; 750 data->temp11[REMOTE_TEMP] = val; 751 752 val = lm90_read_reg(client, LM90_REG_R_STATUS); 753 if (val < 0) 754 return val; 755 data->alarms = val; /* lower 8 bit of alarms */ 756 757 if (data->kind == max6696) { 758 val = lm90_select_remote_channel(client, data, 1); 759 if (val < 0) 760 return val; 761 762 val = lm90_read16(client, LM90_REG_R_REMOTE_TEMPH, 763 LM90_REG_R_REMOTE_TEMPL); 764 if (val < 0) { 765 lm90_select_remote_channel(client, data, 0); 766 return val; 767 } 768 data->temp11[REMOTE2_TEMP] = val; 769 770 lm90_select_remote_channel(client, data, 0); 771 772 val = lm90_read_reg(client, MAX6696_REG_R_STATUS2); 773 if (val < 0) 774 return val; 775 data->alarms |= val << 8; 776 } 777 778 /* 779 * Re-enable ALERT# output if it was originally enabled and 780 * relevant alarms are all clear 781 */ 782 if (!(data->config_orig & 0x80) && 783 !(data->alarms & data->alert_alarms)) { 784 val = lm90_read_reg(client, LM90_REG_R_CONFIG1); 785 if (val < 0) 786 return val; 787 788 if (val & 0x80) { 789 dev_dbg(&client->dev, "Re-enabling ALERT#\n"); 790 i2c_smbus_write_byte_data(client, 791 LM90_REG_W_CONFIG1, 792 val & ~0x80); 793 } 794 } 795 796 data->last_updated = jiffies; 797 data->valid = true; 798 } 799 800 return 0; 801 } 802 803 /* 804 * Conversions 805 * For local temperatures and limits, critical limits and the hysteresis 806 * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius. 807 * For remote temperatures and limits, it uses signed 11-bit values with 808 * LSB = 0.125 degree Celsius, left-justified in 16-bit registers. Some 809 * Maxim chips use unsigned values. 810 */ 811 812 static inline int temp_from_s8(s8 val) 813 { 814 return val * 1000; 815 } 816 817 static inline int temp_from_u8(u8 val) 818 { 819 return val * 1000; 820 } 821 822 static inline int temp_from_s16(s16 val) 823 { 824 return val / 32 * 125; 825 } 826 827 static inline int temp_from_u16(u16 val) 828 { 829 return val / 32 * 125; 830 } 831 832 static s8 temp_to_s8(long val) 833 { 834 if (val <= -128000) 835 return -128; 836 if (val >= 127000) 837 return 127; 838 if (val < 0) 839 return (val - 500) / 1000; 840 return (val + 500) / 1000; 841 } 842 843 static u8 temp_to_u8(long val) 844 { 845 if (val <= 0) 846 return 0; 847 if (val >= 255000) 848 return 255; 849 return (val + 500) / 1000; 850 } 851 852 static s16 temp_to_s16(long val) 853 { 854 if (val <= -128000) 855 return 0x8000; 856 if (val >= 127875) 857 return 0x7FE0; 858 if (val < 0) 859 return (val - 62) / 125 * 32; 860 return (val + 62) / 125 * 32; 861 } 862 863 static u8 hyst_to_reg(long val) 864 { 865 if (val <= 0) 866 return 0; 867 if (val >= 30500) 868 return 31; 869 return (val + 500) / 1000; 870 } 871 872 /* 873 * ADT7461 in compatibility mode is almost identical to LM90 except that 874 * attempts to write values that are outside the range 0 < temp < 127 are 875 * treated as the boundary value. 876 * 877 * ADT7461 in "extended mode" operation uses unsigned integers offset by 878 * 64 (e.g., 0 -> -64 degC). The range is restricted to -64..191 degC. 879 */ 880 static inline int temp_from_u8_adt7461(struct lm90_data *data, u8 val) 881 { 882 if (data->flags & LM90_FLAG_ADT7461_EXT) 883 return (val - 64) * 1000; 884 return temp_from_s8(val); 885 } 886 887 static inline int temp_from_u16_adt7461(struct lm90_data *data, u16 val) 888 { 889 if (data->flags & LM90_FLAG_ADT7461_EXT) 890 return (val - 0x4000) / 64 * 250; 891 return temp_from_s16(val); 892 } 893 894 static u8 temp_to_u8_adt7461(struct lm90_data *data, long val) 895 { 896 if (data->flags & LM90_FLAG_ADT7461_EXT) { 897 if (val <= -64000) 898 return 0; 899 if (val >= 191000) 900 return 0xFF; 901 return (val + 500 + 64000) / 1000; 902 } 903 if (val <= 0) 904 return 0; 905 if (val >= 127000) 906 return 127; 907 return (val + 500) / 1000; 908 } 909 910 static u16 temp_to_u16_adt7461(struct lm90_data *data, long val) 911 { 912 if (data->flags & LM90_FLAG_ADT7461_EXT) { 913 if (val <= -64000) 914 return 0; 915 if (val >= 191750) 916 return 0xFFC0; 917 return (val + 64000 + 125) / 250 * 64; 918 } 919 if (val <= 0) 920 return 0; 921 if (val >= 127750) 922 return 0x7FC0; 923 return (val + 125) / 250 * 64; 924 } 925 926 /* pec used for ADM1032 only */ 927 static ssize_t pec_show(struct device *dev, struct device_attribute *dummy, 928 char *buf) 929 { 930 struct i2c_client *client = to_i2c_client(dev); 931 932 return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC)); 933 } 934 935 static ssize_t pec_store(struct device *dev, struct device_attribute *dummy, 936 const char *buf, size_t count) 937 { 938 struct i2c_client *client = to_i2c_client(dev); 939 long val; 940 int err; 941 942 err = kstrtol(buf, 10, &val); 943 if (err < 0) 944 return err; 945 946 switch (val) { 947 case 0: 948 client->flags &= ~I2C_CLIENT_PEC; 949 break; 950 case 1: 951 client->flags |= I2C_CLIENT_PEC; 952 break; 953 default: 954 return -EINVAL; 955 } 956 957 return count; 958 } 959 960 static DEVICE_ATTR_RW(pec); 961 962 static int lm90_get_temp11(struct lm90_data *data, int index) 963 { 964 s16 temp11 = data->temp11[index]; 965 int temp; 966 967 if (data->kind == adt7461 || data->kind == tmp451) 968 temp = temp_from_u16_adt7461(data, temp11); 969 else if (data->kind == max6646) 970 temp = temp_from_u16(temp11); 971 else 972 temp = temp_from_s16(temp11); 973 974 /* +16 degrees offset for temp2 for the LM99 */ 975 if (data->kind == lm99 && index <= 2) 976 temp += 16000; 977 978 return temp; 979 } 980 981 static int lm90_set_temp11(struct lm90_data *data, int index, long val) 982 { 983 static struct reg { 984 u8 high; 985 u8 low; 986 } reg[] = { 987 [REMOTE_LOW] = { LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL }, 988 [REMOTE_HIGH] = { LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL }, 989 [REMOTE_OFFSET] = { LM90_REG_W_REMOTE_OFFSH, LM90_REG_W_REMOTE_OFFSL }, 990 [REMOTE2_LOW] = { LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL }, 991 [REMOTE2_HIGH] = { LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL } 992 }; 993 struct i2c_client *client = data->client; 994 struct reg *regp = ®[index]; 995 int err; 996 997 /* +16 degrees offset for temp2 for the LM99 */ 998 if (data->kind == lm99 && index <= 2) 999 val -= 16000; 1000 1001 if (data->kind == adt7461 || data->kind == tmp451) 1002 data->temp11[index] = temp_to_u16_adt7461(data, val); 1003 else if (data->kind == max6646) 1004 data->temp11[index] = temp_to_u8(val) << 8; 1005 else if (data->flags & LM90_HAVE_REM_LIMIT_EXT) 1006 data->temp11[index] = temp_to_s16(val); 1007 else 1008 data->temp11[index] = temp_to_s8(val) << 8; 1009 1010 lm90_select_remote_channel(client, data, index >= 3); 1011 err = i2c_smbus_write_byte_data(client, regp->high, 1012 data->temp11[index] >> 8); 1013 if (err < 0) 1014 return err; 1015 if (data->flags & LM90_HAVE_REM_LIMIT_EXT) 1016 err = i2c_smbus_write_byte_data(client, regp->low, 1017 data->temp11[index] & 0xff); 1018 1019 lm90_select_remote_channel(client, data, 0); 1020 return err; 1021 } 1022 1023 static int lm90_get_temp8(struct lm90_data *data, int index) 1024 { 1025 s8 temp8 = data->temp8[index]; 1026 int temp; 1027 1028 if (data->kind == adt7461 || data->kind == tmp451) 1029 temp = temp_from_u8_adt7461(data, temp8); 1030 else if (data->kind == max6646) 1031 temp = temp_from_u8(temp8); 1032 else 1033 temp = temp_from_s8(temp8); 1034 1035 /* +16 degrees offset for temp2 for the LM99 */ 1036 if (data->kind == lm99 && index == 3) 1037 temp += 16000; 1038 1039 return temp; 1040 } 1041 1042 static int lm90_set_temp8(struct lm90_data *data, int index, long val) 1043 { 1044 static const u8 reg[TEMP8_REG_NUM] = { 1045 LM90_REG_W_LOCAL_LOW, 1046 LM90_REG_W_LOCAL_HIGH, 1047 LM90_REG_W_LOCAL_CRIT, 1048 LM90_REG_W_REMOTE_CRIT, 1049 MAX6659_REG_W_LOCAL_EMERG, 1050 MAX6659_REG_W_REMOTE_EMERG, 1051 LM90_REG_W_REMOTE_CRIT, 1052 MAX6659_REG_W_REMOTE_EMERG, 1053 }; 1054 struct i2c_client *client = data->client; 1055 int err; 1056 1057 /* +16 degrees offset for temp2 for the LM99 */ 1058 if (data->kind == lm99 && index == 3) 1059 val -= 16000; 1060 1061 if (data->kind == adt7461 || data->kind == tmp451) 1062 data->temp8[index] = temp_to_u8_adt7461(data, val); 1063 else if (data->kind == max6646) 1064 data->temp8[index] = temp_to_u8(val); 1065 else 1066 data->temp8[index] = temp_to_s8(val); 1067 1068 lm90_select_remote_channel(client, data, index >= 6); 1069 err = i2c_smbus_write_byte_data(client, reg[index], data->temp8[index]); 1070 lm90_select_remote_channel(client, data, 0); 1071 1072 return err; 1073 } 1074 1075 static int lm90_get_temphyst(struct lm90_data *data, int index) 1076 { 1077 int temp; 1078 1079 if (data->kind == adt7461 || data->kind == tmp451) 1080 temp = temp_from_u8_adt7461(data, data->temp8[index]); 1081 else if (data->kind == max6646) 1082 temp = temp_from_u8(data->temp8[index]); 1083 else 1084 temp = temp_from_s8(data->temp8[index]); 1085 1086 /* +16 degrees offset for temp2 for the LM99 */ 1087 if (data->kind == lm99 && index == 3) 1088 temp += 16000; 1089 1090 return temp - temp_from_s8(data->temp_hyst); 1091 } 1092 1093 static int lm90_set_temphyst(struct lm90_data *data, long val) 1094 { 1095 struct i2c_client *client = data->client; 1096 int temp; 1097 int err; 1098 1099 if (data->kind == adt7461 || data->kind == tmp451) 1100 temp = temp_from_u8_adt7461(data, data->temp8[LOCAL_CRIT]); 1101 else if (data->kind == max6646) 1102 temp = temp_from_u8(data->temp8[LOCAL_CRIT]); 1103 else 1104 temp = temp_from_s8(data->temp8[LOCAL_CRIT]); 1105 1106 data->temp_hyst = hyst_to_reg(temp - val); 1107 err = i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST, 1108 data->temp_hyst); 1109 return err; 1110 } 1111 1112 static const u8 lm90_temp_index[3] = { 1113 LOCAL_TEMP, REMOTE_TEMP, REMOTE2_TEMP 1114 }; 1115 1116 static const u8 lm90_temp_min_index[3] = { 1117 LOCAL_LOW, REMOTE_LOW, REMOTE2_LOW 1118 }; 1119 1120 static const u8 lm90_temp_max_index[3] = { 1121 LOCAL_HIGH, REMOTE_HIGH, REMOTE2_HIGH 1122 }; 1123 1124 static const u8 lm90_temp_crit_index[3] = { 1125 LOCAL_CRIT, REMOTE_CRIT, REMOTE2_CRIT 1126 }; 1127 1128 static const u8 lm90_temp_emerg_index[3] = { 1129 LOCAL_EMERG, REMOTE_EMERG, REMOTE2_EMERG 1130 }; 1131 1132 static const u8 lm90_min_alarm_bits[3] = { 5, 3, 11 }; 1133 static const u8 lm90_max_alarm_bits[3] = { 6, 4, 12 }; 1134 static const u8 lm90_crit_alarm_bits[3] = { 0, 1, 9 }; 1135 static const u8 lm90_emergency_alarm_bits[3] = { 15, 13, 14 }; 1136 static const u8 lm90_fault_bits[3] = { 0, 2, 10 }; 1137 1138 static int lm90_temp_read(struct device *dev, u32 attr, int channel, long *val) 1139 { 1140 struct lm90_data *data = dev_get_drvdata(dev); 1141 int err; 1142 1143 mutex_lock(&data->update_lock); 1144 err = lm90_update_device(dev); 1145 mutex_unlock(&data->update_lock); 1146 if (err) 1147 return err; 1148 1149 switch (attr) { 1150 case hwmon_temp_input: 1151 *val = lm90_get_temp11(data, lm90_temp_index[channel]); 1152 break; 1153 case hwmon_temp_min_alarm: 1154 *val = (data->alarms >> lm90_min_alarm_bits[channel]) & 1; 1155 break; 1156 case hwmon_temp_max_alarm: 1157 *val = (data->alarms >> lm90_max_alarm_bits[channel]) & 1; 1158 break; 1159 case hwmon_temp_crit_alarm: 1160 *val = (data->alarms >> lm90_crit_alarm_bits[channel]) & 1; 1161 break; 1162 case hwmon_temp_emergency_alarm: 1163 *val = (data->alarms >> lm90_emergency_alarm_bits[channel]) & 1; 1164 break; 1165 case hwmon_temp_fault: 1166 *val = (data->alarms >> lm90_fault_bits[channel]) & 1; 1167 break; 1168 case hwmon_temp_min: 1169 if (channel == 0) 1170 *val = lm90_get_temp8(data, 1171 lm90_temp_min_index[channel]); 1172 else 1173 *val = lm90_get_temp11(data, 1174 lm90_temp_min_index[channel]); 1175 break; 1176 case hwmon_temp_max: 1177 if (channel == 0) 1178 *val = lm90_get_temp8(data, 1179 lm90_temp_max_index[channel]); 1180 else 1181 *val = lm90_get_temp11(data, 1182 lm90_temp_max_index[channel]); 1183 break; 1184 case hwmon_temp_crit: 1185 *val = lm90_get_temp8(data, lm90_temp_crit_index[channel]); 1186 break; 1187 case hwmon_temp_crit_hyst: 1188 *val = lm90_get_temphyst(data, lm90_temp_crit_index[channel]); 1189 break; 1190 case hwmon_temp_emergency: 1191 *val = lm90_get_temp8(data, lm90_temp_emerg_index[channel]); 1192 break; 1193 case hwmon_temp_emergency_hyst: 1194 *val = lm90_get_temphyst(data, lm90_temp_emerg_index[channel]); 1195 break; 1196 case hwmon_temp_offset: 1197 *val = lm90_get_temp11(data, REMOTE_OFFSET); 1198 break; 1199 default: 1200 return -EOPNOTSUPP; 1201 } 1202 return 0; 1203 } 1204 1205 static int lm90_temp_write(struct device *dev, u32 attr, int channel, long val) 1206 { 1207 struct lm90_data *data = dev_get_drvdata(dev); 1208 int err; 1209 1210 mutex_lock(&data->update_lock); 1211 1212 err = lm90_update_device(dev); 1213 if (err) 1214 goto error; 1215 1216 switch (attr) { 1217 case hwmon_temp_min: 1218 if (channel == 0) 1219 err = lm90_set_temp8(data, 1220 lm90_temp_min_index[channel], 1221 val); 1222 else 1223 err = lm90_set_temp11(data, 1224 lm90_temp_min_index[channel], 1225 val); 1226 break; 1227 case hwmon_temp_max: 1228 if (channel == 0) 1229 err = lm90_set_temp8(data, 1230 lm90_temp_max_index[channel], 1231 val); 1232 else 1233 err = lm90_set_temp11(data, 1234 lm90_temp_max_index[channel], 1235 val); 1236 break; 1237 case hwmon_temp_crit: 1238 err = lm90_set_temp8(data, lm90_temp_crit_index[channel], val); 1239 break; 1240 case hwmon_temp_crit_hyst: 1241 err = lm90_set_temphyst(data, val); 1242 break; 1243 case hwmon_temp_emergency: 1244 err = lm90_set_temp8(data, lm90_temp_emerg_index[channel], val); 1245 break; 1246 case hwmon_temp_offset: 1247 err = lm90_set_temp11(data, REMOTE_OFFSET, val); 1248 break; 1249 default: 1250 err = -EOPNOTSUPP; 1251 break; 1252 } 1253 error: 1254 mutex_unlock(&data->update_lock); 1255 1256 return err; 1257 } 1258 1259 static umode_t lm90_temp_is_visible(const void *data, u32 attr, int channel) 1260 { 1261 switch (attr) { 1262 case hwmon_temp_input: 1263 case hwmon_temp_min_alarm: 1264 case hwmon_temp_max_alarm: 1265 case hwmon_temp_crit_alarm: 1266 case hwmon_temp_emergency_alarm: 1267 case hwmon_temp_emergency_hyst: 1268 case hwmon_temp_fault: 1269 return S_IRUGO; 1270 case hwmon_temp_min: 1271 case hwmon_temp_max: 1272 case hwmon_temp_crit: 1273 case hwmon_temp_emergency: 1274 case hwmon_temp_offset: 1275 return S_IRUGO | S_IWUSR; 1276 case hwmon_temp_crit_hyst: 1277 if (channel == 0) 1278 return S_IRUGO | S_IWUSR; 1279 return S_IRUGO; 1280 default: 1281 return 0; 1282 } 1283 } 1284 1285 static int lm90_chip_read(struct device *dev, u32 attr, int channel, long *val) 1286 { 1287 struct lm90_data *data = dev_get_drvdata(dev); 1288 int err; 1289 1290 mutex_lock(&data->update_lock); 1291 err = lm90_update_device(dev); 1292 mutex_unlock(&data->update_lock); 1293 if (err) 1294 return err; 1295 1296 switch (attr) { 1297 case hwmon_chip_update_interval: 1298 *val = data->update_interval; 1299 break; 1300 case hwmon_chip_alarms: 1301 *val = data->alarms; 1302 break; 1303 default: 1304 return -EOPNOTSUPP; 1305 } 1306 1307 return 0; 1308 } 1309 1310 static int lm90_chip_write(struct device *dev, u32 attr, int channel, long val) 1311 { 1312 struct lm90_data *data = dev_get_drvdata(dev); 1313 struct i2c_client *client = data->client; 1314 int err; 1315 1316 mutex_lock(&data->update_lock); 1317 1318 err = lm90_update_device(dev); 1319 if (err) 1320 goto error; 1321 1322 switch (attr) { 1323 case hwmon_chip_update_interval: 1324 err = lm90_set_convrate(client, data, 1325 clamp_val(val, 0, 100000)); 1326 break; 1327 default: 1328 err = -EOPNOTSUPP; 1329 break; 1330 } 1331 error: 1332 mutex_unlock(&data->update_lock); 1333 1334 return err; 1335 } 1336 1337 static umode_t lm90_chip_is_visible(const void *data, u32 attr, int channel) 1338 { 1339 switch (attr) { 1340 case hwmon_chip_update_interval: 1341 return S_IRUGO | S_IWUSR; 1342 case hwmon_chip_alarms: 1343 return S_IRUGO; 1344 default: 1345 return 0; 1346 } 1347 } 1348 1349 static int lm90_read(struct device *dev, enum hwmon_sensor_types type, 1350 u32 attr, int channel, long *val) 1351 { 1352 switch (type) { 1353 case hwmon_chip: 1354 return lm90_chip_read(dev, attr, channel, val); 1355 case hwmon_temp: 1356 return lm90_temp_read(dev, attr, channel, val); 1357 default: 1358 return -EOPNOTSUPP; 1359 } 1360 } 1361 1362 static int lm90_write(struct device *dev, enum hwmon_sensor_types type, 1363 u32 attr, int channel, long val) 1364 { 1365 switch (type) { 1366 case hwmon_chip: 1367 return lm90_chip_write(dev, attr, channel, val); 1368 case hwmon_temp: 1369 return lm90_temp_write(dev, attr, channel, val); 1370 default: 1371 return -EOPNOTSUPP; 1372 } 1373 } 1374 1375 static umode_t lm90_is_visible(const void *data, enum hwmon_sensor_types type, 1376 u32 attr, int channel) 1377 { 1378 switch (type) { 1379 case hwmon_chip: 1380 return lm90_chip_is_visible(data, attr, channel); 1381 case hwmon_temp: 1382 return lm90_temp_is_visible(data, attr, channel); 1383 default: 1384 return 0; 1385 } 1386 } 1387 1388 /* Return 0 if detection is successful, -ENODEV otherwise */ 1389 static int lm90_detect(struct i2c_client *client, 1390 struct i2c_board_info *info) 1391 { 1392 struct i2c_adapter *adapter = client->adapter; 1393 int address = client->addr; 1394 const char *name = NULL; 1395 int man_id, chip_id, config1, config2, convrate; 1396 1397 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 1398 return -ENODEV; 1399 1400 /* detection and identification */ 1401 man_id = i2c_smbus_read_byte_data(client, LM90_REG_R_MAN_ID); 1402 chip_id = i2c_smbus_read_byte_data(client, LM90_REG_R_CHIP_ID); 1403 config1 = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG1); 1404 convrate = i2c_smbus_read_byte_data(client, LM90_REG_R_CONVRATE); 1405 if (man_id < 0 || chip_id < 0 || config1 < 0 || convrate < 0) 1406 return -ENODEV; 1407 1408 if (man_id == 0x01 || man_id == 0x5C || man_id == 0x41) { 1409 config2 = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG2); 1410 if (config2 < 0) 1411 return -ENODEV; 1412 } else 1413 config2 = 0; /* Make compiler happy */ 1414 1415 if ((address == 0x4C || address == 0x4D) 1416 && man_id == 0x01) { /* National Semiconductor */ 1417 if ((config1 & 0x2A) == 0x00 1418 && (config2 & 0xF8) == 0x00 1419 && convrate <= 0x09) { 1420 if (address == 0x4C 1421 && (chip_id & 0xF0) == 0x20) { /* LM90 */ 1422 name = "lm90"; 1423 } else 1424 if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */ 1425 name = "lm99"; 1426 dev_info(&adapter->dev, 1427 "Assuming LM99 chip at 0x%02x\n", 1428 address); 1429 dev_info(&adapter->dev, 1430 "If it is an LM89, instantiate it " 1431 "with the new_device sysfs " 1432 "interface\n"); 1433 } else 1434 if (address == 0x4C 1435 && (chip_id & 0xF0) == 0x10) { /* LM86 */ 1436 name = "lm86"; 1437 } 1438 } 1439 } else 1440 if ((address == 0x4C || address == 0x4D) 1441 && man_id == 0x41) { /* Analog Devices */ 1442 if ((chip_id & 0xF0) == 0x40 /* ADM1032 */ 1443 && (config1 & 0x3F) == 0x00 1444 && convrate <= 0x0A) { 1445 name = "adm1032"; 1446 /* 1447 * The ADM1032 supports PEC, but only if combined 1448 * transactions are not used. 1449 */ 1450 if (i2c_check_functionality(adapter, 1451 I2C_FUNC_SMBUS_BYTE)) 1452 info->flags |= I2C_CLIENT_PEC; 1453 } else 1454 if (chip_id == 0x51 /* ADT7461 */ 1455 && (config1 & 0x1B) == 0x00 1456 && convrate <= 0x0A) { 1457 name = "adt7461"; 1458 } else 1459 if (chip_id == 0x57 /* ADT7461A, NCT1008 */ 1460 && (config1 & 0x1B) == 0x00 1461 && convrate <= 0x0A) { 1462 name = "adt7461a"; 1463 } 1464 } else 1465 if (man_id == 0x4D) { /* Maxim */ 1466 int emerg, emerg2, status2; 1467 1468 /* 1469 * We read MAX6659_REG_R_REMOTE_EMERG twice, and re-read 1470 * LM90_REG_R_MAN_ID in between. If MAX6659_REG_R_REMOTE_EMERG 1471 * exists, both readings will reflect the same value. Otherwise, 1472 * the readings will be different. 1473 */ 1474 emerg = i2c_smbus_read_byte_data(client, 1475 MAX6659_REG_R_REMOTE_EMERG); 1476 man_id = i2c_smbus_read_byte_data(client, 1477 LM90_REG_R_MAN_ID); 1478 emerg2 = i2c_smbus_read_byte_data(client, 1479 MAX6659_REG_R_REMOTE_EMERG); 1480 status2 = i2c_smbus_read_byte_data(client, 1481 MAX6696_REG_R_STATUS2); 1482 if (emerg < 0 || man_id < 0 || emerg2 < 0 || status2 < 0) 1483 return -ENODEV; 1484 1485 /* 1486 * The MAX6657, MAX6658 and MAX6659 do NOT have a chip_id 1487 * register. Reading from that address will return the last 1488 * read value, which in our case is those of the man_id 1489 * register. Likewise, the config1 register seems to lack a 1490 * low nibble, so the value will be those of the previous 1491 * read, so in our case those of the man_id register. 1492 * MAX6659 has a third set of upper temperature limit registers. 1493 * Those registers also return values on MAX6657 and MAX6658, 1494 * thus the only way to detect MAX6659 is by its address. 1495 * For this reason it will be mis-detected as MAX6657 if its 1496 * address is 0x4C. 1497 */ 1498 if (chip_id == man_id 1499 && (address == 0x4C || address == 0x4D || address == 0x4E) 1500 && (config1 & 0x1F) == (man_id & 0x0F) 1501 && convrate <= 0x09) { 1502 if (address == 0x4C) 1503 name = "max6657"; 1504 else 1505 name = "max6659"; 1506 } else 1507 /* 1508 * Even though MAX6695 and MAX6696 do not have a chip ID 1509 * register, reading it returns 0x01. Bit 4 of the config1 1510 * register is unused and should return zero when read. Bit 0 of 1511 * the status2 register is unused and should return zero when 1512 * read. 1513 * 1514 * MAX6695 and MAX6696 have an additional set of temperature 1515 * limit registers. We can detect those chips by checking if 1516 * one of those registers exists. 1517 */ 1518 if (chip_id == 0x01 1519 && (config1 & 0x10) == 0x00 1520 && (status2 & 0x01) == 0x00 1521 && emerg == emerg2 1522 && convrate <= 0x07) { 1523 name = "max6696"; 1524 } else 1525 /* 1526 * The chip_id register of the MAX6680 and MAX6681 holds the 1527 * revision of the chip. The lowest bit of the config1 register 1528 * is unused and should return zero when read, so should the 1529 * second to last bit of config1 (software reset). 1530 */ 1531 if (chip_id == 0x01 1532 && (config1 & 0x03) == 0x00 1533 && convrate <= 0x07) { 1534 name = "max6680"; 1535 } else 1536 /* 1537 * The chip_id register of the MAX6646/6647/6649 holds the 1538 * revision of the chip. The lowest 6 bits of the config1 1539 * register are unused and should return zero when read. 1540 */ 1541 if (chip_id == 0x59 1542 && (config1 & 0x3f) == 0x00 1543 && convrate <= 0x07) { 1544 name = "max6646"; 1545 } 1546 } else 1547 if (address == 0x4C 1548 && man_id == 0x5C) { /* Winbond/Nuvoton */ 1549 if ((config1 & 0x2A) == 0x00 1550 && (config2 & 0xF8) == 0x00) { 1551 if (chip_id == 0x01 /* W83L771W/G */ 1552 && convrate <= 0x09) { 1553 name = "w83l771"; 1554 } else 1555 if ((chip_id & 0xFE) == 0x10 /* W83L771AWG/ASG */ 1556 && convrate <= 0x08) { 1557 name = "w83l771"; 1558 } 1559 } 1560 } else 1561 if (address >= 0x48 && address <= 0x4F 1562 && man_id == 0xA1) { /* NXP Semiconductor/Philips */ 1563 if (chip_id == 0x00 1564 && (config1 & 0x2A) == 0x00 1565 && (config2 & 0xFE) == 0x00 1566 && convrate <= 0x09) { 1567 name = "sa56004"; 1568 } 1569 } else 1570 if ((address == 0x4C || address == 0x4D) 1571 && man_id == 0x47) { /* GMT */ 1572 if (chip_id == 0x01 /* G781 */ 1573 && (config1 & 0x3F) == 0x00 1574 && convrate <= 0x08) 1575 name = "g781"; 1576 } else 1577 if (address == 0x4C 1578 && man_id == 0x55) { /* Texas Instruments */ 1579 int local_ext; 1580 1581 local_ext = i2c_smbus_read_byte_data(client, 1582 TMP451_REG_R_LOCAL_TEMPL); 1583 1584 if (chip_id == 0x00 /* TMP451 */ 1585 && (config1 & 0x1B) == 0x00 1586 && convrate <= 0x09 1587 && (local_ext & 0x0F) == 0x00) 1588 name = "tmp451"; 1589 } 1590 1591 if (!name) { /* identification failed */ 1592 dev_dbg(&adapter->dev, 1593 "Unsupported chip at 0x%02x (man_id=0x%02X, " 1594 "chip_id=0x%02X)\n", address, man_id, chip_id); 1595 return -ENODEV; 1596 } 1597 1598 strlcpy(info->type, name, I2C_NAME_SIZE); 1599 1600 return 0; 1601 } 1602 1603 static void lm90_restore_conf(void *_data) 1604 { 1605 struct lm90_data *data = _data; 1606 struct i2c_client *client = data->client; 1607 1608 /* Restore initial configuration */ 1609 i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, 1610 data->convrate_orig); 1611 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, 1612 data->config_orig); 1613 } 1614 1615 static int lm90_init_client(struct i2c_client *client, struct lm90_data *data) 1616 { 1617 int config, convrate; 1618 1619 convrate = lm90_read_reg(client, LM90_REG_R_CONVRATE); 1620 if (convrate < 0) 1621 return convrate; 1622 data->convrate_orig = convrate; 1623 1624 /* 1625 * Start the conversions. 1626 */ 1627 lm90_set_convrate(client, data, 500); /* 500ms; 2Hz conversion rate */ 1628 config = lm90_read_reg(client, LM90_REG_R_CONFIG1); 1629 if (config < 0) 1630 return config; 1631 data->config_orig = config; 1632 1633 /* Check Temperature Range Select */ 1634 if (data->kind == adt7461 || data->kind == tmp451) { 1635 if (config & 0x04) 1636 data->flags |= LM90_FLAG_ADT7461_EXT; 1637 } 1638 1639 /* 1640 * Put MAX6680/MAX8881 into extended resolution (bit 0x10, 1641 * 0.125 degree resolution) and range (0x08, extend range 1642 * to -64 degree) mode for the remote temperature sensor. 1643 */ 1644 if (data->kind == max6680) 1645 config |= 0x18; 1646 1647 /* 1648 * Select external channel 0 for max6695/96 1649 */ 1650 if (data->kind == max6696) 1651 config &= ~0x08; 1652 1653 config &= 0xBF; /* run */ 1654 if (config != data->config_orig) /* Only write if changed */ 1655 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config); 1656 1657 return devm_add_action_or_reset(&client->dev, lm90_restore_conf, data); 1658 } 1659 1660 static bool lm90_is_tripped(struct i2c_client *client, u16 *status) 1661 { 1662 struct lm90_data *data = i2c_get_clientdata(client); 1663 int st, st2 = 0; 1664 1665 st = lm90_read_reg(client, LM90_REG_R_STATUS); 1666 if (st < 0) 1667 return false; 1668 1669 if (data->kind == max6696) { 1670 st2 = lm90_read_reg(client, MAX6696_REG_R_STATUS2); 1671 if (st2 < 0) 1672 return false; 1673 } 1674 1675 *status = st | (st2 << 8); 1676 1677 if ((st & 0x7f) == 0 && (st2 & 0xfe) == 0) 1678 return false; 1679 1680 if ((st & (LM90_STATUS_LLOW | LM90_STATUS_LHIGH | LM90_STATUS_LTHRM)) || 1681 (st2 & MAX6696_STATUS2_LOT2)) 1682 dev_warn(&client->dev, 1683 "temp%d out of range, please check!\n", 1); 1684 if ((st & (LM90_STATUS_RLOW | LM90_STATUS_RHIGH | LM90_STATUS_RTHRM)) || 1685 (st2 & MAX6696_STATUS2_ROT2)) 1686 dev_warn(&client->dev, 1687 "temp%d out of range, please check!\n", 2); 1688 if (st & LM90_STATUS_ROPEN) 1689 dev_warn(&client->dev, 1690 "temp%d diode open, please check!\n", 2); 1691 if (st2 & (MAX6696_STATUS2_R2LOW | MAX6696_STATUS2_R2HIGH | 1692 MAX6696_STATUS2_R2THRM | MAX6696_STATUS2_R2OT2)) 1693 dev_warn(&client->dev, 1694 "temp%d out of range, please check!\n", 3); 1695 if (st2 & MAX6696_STATUS2_R2OPEN) 1696 dev_warn(&client->dev, 1697 "temp%d diode open, please check!\n", 3); 1698 1699 return true; 1700 } 1701 1702 static irqreturn_t lm90_irq_thread(int irq, void *dev_id) 1703 { 1704 struct i2c_client *client = dev_id; 1705 u16 status; 1706 1707 if (lm90_is_tripped(client, &status)) 1708 return IRQ_HANDLED; 1709 else 1710 return IRQ_NONE; 1711 } 1712 1713 static void lm90_remove_pec(void *dev) 1714 { 1715 device_remove_file(dev, &dev_attr_pec); 1716 } 1717 1718 static void lm90_regulator_disable(void *regulator) 1719 { 1720 regulator_disable(regulator); 1721 } 1722 1723 static const u32 lm90_chip_config[] = { 1724 HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL | HWMON_C_ALARMS, 1725 0 1726 }; 1727 1728 static const struct hwmon_channel_info lm90_chip_info = { 1729 .type = hwmon_chip, 1730 .config = lm90_chip_config, 1731 }; 1732 1733 1734 static const struct hwmon_ops lm90_ops = { 1735 .is_visible = lm90_is_visible, 1736 .read = lm90_read, 1737 .write = lm90_write, 1738 }; 1739 1740 static int lm90_probe(struct i2c_client *client, 1741 const struct i2c_device_id *id) 1742 { 1743 struct device *dev = &client->dev; 1744 struct i2c_adapter *adapter = to_i2c_adapter(dev->parent); 1745 struct hwmon_channel_info *info; 1746 struct regulator *regulator; 1747 struct device *hwmon_dev; 1748 struct lm90_data *data; 1749 int err; 1750 1751 regulator = devm_regulator_get(dev, "vcc"); 1752 if (IS_ERR(regulator)) 1753 return PTR_ERR(regulator); 1754 1755 err = regulator_enable(regulator); 1756 if (err < 0) { 1757 dev_err(dev, "Failed to enable regulator: %d\n", err); 1758 return err; 1759 } 1760 1761 err = devm_add_action_or_reset(dev, lm90_regulator_disable, regulator); 1762 if (err) 1763 return err; 1764 1765 data = devm_kzalloc(dev, sizeof(struct lm90_data), GFP_KERNEL); 1766 if (!data) 1767 return -ENOMEM; 1768 1769 data->client = client; 1770 i2c_set_clientdata(client, data); 1771 mutex_init(&data->update_lock); 1772 1773 /* Set the device type */ 1774 if (client->dev.of_node) 1775 data->kind = (enum chips)of_device_get_match_data(&client->dev); 1776 else 1777 data->kind = id->driver_data; 1778 if (data->kind == adm1032) { 1779 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) 1780 client->flags &= ~I2C_CLIENT_PEC; 1781 } 1782 1783 /* 1784 * Different devices have different alarm bits triggering the 1785 * ALERT# output 1786 */ 1787 data->alert_alarms = lm90_params[data->kind].alert_alarms; 1788 1789 /* Set chip capabilities */ 1790 data->flags = lm90_params[data->kind].flags; 1791 1792 data->chip.ops = &lm90_ops; 1793 data->chip.info = data->info; 1794 1795 data->info[0] = &lm90_chip_info; 1796 data->info[1] = &data->temp_info; 1797 1798 info = &data->temp_info; 1799 info->type = hwmon_temp; 1800 info->config = data->channel_config; 1801 1802 data->channel_config[0] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | 1803 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM | 1804 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM; 1805 data->channel_config[1] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | 1806 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM | 1807 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT; 1808 1809 if (data->flags & LM90_HAVE_OFFSET) 1810 data->channel_config[1] |= HWMON_T_OFFSET; 1811 1812 if (data->flags & LM90_HAVE_EMERGENCY) { 1813 data->channel_config[0] |= HWMON_T_EMERGENCY | 1814 HWMON_T_EMERGENCY_HYST; 1815 data->channel_config[1] |= HWMON_T_EMERGENCY | 1816 HWMON_T_EMERGENCY_HYST; 1817 } 1818 1819 if (data->flags & LM90_HAVE_EMERGENCY_ALARM) { 1820 data->channel_config[0] |= HWMON_T_EMERGENCY_ALARM; 1821 data->channel_config[1] |= HWMON_T_EMERGENCY_ALARM; 1822 } 1823 1824 if (data->flags & LM90_HAVE_TEMP3) { 1825 data->channel_config[2] = HWMON_T_INPUT | 1826 HWMON_T_MIN | HWMON_T_MAX | 1827 HWMON_T_CRIT | HWMON_T_CRIT_HYST | 1828 HWMON_T_EMERGENCY | HWMON_T_EMERGENCY_HYST | 1829 HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM | 1830 HWMON_T_CRIT_ALARM | HWMON_T_EMERGENCY_ALARM | 1831 HWMON_T_FAULT; 1832 } 1833 1834 data->reg_local_ext = lm90_params[data->kind].reg_local_ext; 1835 1836 /* Set maximum conversion rate */ 1837 data->max_convrate = lm90_params[data->kind].max_convrate; 1838 1839 /* Initialize the LM90 chip */ 1840 err = lm90_init_client(client, data); 1841 if (err < 0) { 1842 dev_err(dev, "Failed to initialize device\n"); 1843 return err; 1844 } 1845 1846 /* 1847 * The 'pec' attribute is attached to the i2c device and thus created 1848 * separately. 1849 */ 1850 if (client->flags & I2C_CLIENT_PEC) { 1851 err = device_create_file(dev, &dev_attr_pec); 1852 if (err) 1853 return err; 1854 err = devm_add_action_or_reset(dev, lm90_remove_pec, dev); 1855 if (err) 1856 return err; 1857 } 1858 1859 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, 1860 data, &data->chip, 1861 NULL); 1862 if (IS_ERR(hwmon_dev)) 1863 return PTR_ERR(hwmon_dev); 1864 1865 if (client->irq) { 1866 dev_dbg(dev, "IRQ: %d\n", client->irq); 1867 err = devm_request_threaded_irq(dev, client->irq, 1868 NULL, lm90_irq_thread, 1869 IRQF_TRIGGER_LOW | IRQF_ONESHOT, 1870 "lm90", client); 1871 if (err < 0) { 1872 dev_err(dev, "cannot request IRQ %d\n", client->irq); 1873 return err; 1874 } 1875 } 1876 1877 return 0; 1878 } 1879 1880 static void lm90_alert(struct i2c_client *client, enum i2c_alert_protocol type, 1881 unsigned int flag) 1882 { 1883 u16 alarms; 1884 1885 if (type != I2C_PROTOCOL_SMBUS_ALERT) 1886 return; 1887 1888 if (lm90_is_tripped(client, &alarms)) { 1889 /* 1890 * Disable ALERT# output, because these chips don't implement 1891 * SMBus alert correctly; they should only hold the alert line 1892 * low briefly. 1893 */ 1894 struct lm90_data *data = i2c_get_clientdata(client); 1895 1896 if ((data->flags & LM90_HAVE_BROKEN_ALERT) && 1897 (alarms & data->alert_alarms)) { 1898 int config; 1899 1900 dev_dbg(&client->dev, "Disabling ALERT#\n"); 1901 config = lm90_read_reg(client, LM90_REG_R_CONFIG1); 1902 if (config >= 0) 1903 i2c_smbus_write_byte_data(client, 1904 LM90_REG_W_CONFIG1, 1905 config | 0x80); 1906 } 1907 } else { 1908 dev_info(&client->dev, "Everything OK\n"); 1909 } 1910 } 1911 1912 static struct i2c_driver lm90_driver = { 1913 .class = I2C_CLASS_HWMON, 1914 .driver = { 1915 .name = "lm90", 1916 .of_match_table = of_match_ptr(lm90_of_match), 1917 }, 1918 .probe = lm90_probe, 1919 .alert = lm90_alert, 1920 .id_table = lm90_id, 1921 .detect = lm90_detect, 1922 .address_list = normal_i2c, 1923 }; 1924 1925 module_i2c_driver(lm90_driver); 1926 1927 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>"); 1928 MODULE_DESCRIPTION("LM90/ADM1032 driver"); 1929 MODULE_LICENSE("GPL"); 1930