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-sysfs.h> 93 #include <linux/hwmon.h> 94 #include <linux/err.h> 95 #include <linux/mutex.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_DEF_CONVRATE_RVAL 6 /* Def conversion rate register value */ 175 #define LM90_MAX_CONVRATE_MS 16000 /* Maximum conversion rate in ms */ 176 177 /* TMP451 registers */ 178 #define TMP451_REG_R_LOCAL_TEMPL 0x15 179 180 /* 181 * Device flags 182 */ 183 #define LM90_FLAG_ADT7461_EXT (1 << 0) /* ADT7461 extended mode */ 184 /* Device features */ 185 #define LM90_HAVE_OFFSET (1 << 1) /* temperature offset register */ 186 #define LM90_HAVE_REM_LIMIT_EXT (1 << 3) /* extended remote limit */ 187 #define LM90_HAVE_EMERGENCY (1 << 4) /* 3rd upper (emergency) limit */ 188 #define LM90_HAVE_EMERGENCY_ALARM (1 << 5)/* emergency alarm */ 189 #define LM90_HAVE_TEMP3 (1 << 6) /* 3rd temperature sensor */ 190 #define LM90_HAVE_BROKEN_ALERT (1 << 7) /* Broken alert */ 191 192 /* LM90 status */ 193 #define LM90_STATUS_LTHRM (1 << 0) /* local THERM limit tripped */ 194 #define LM90_STATUS_RTHRM (1 << 1) /* remote THERM limit tripped */ 195 #define LM90_STATUS_ROPEN (1 << 2) /* remote is an open circuit */ 196 #define LM90_STATUS_RLOW (1 << 3) /* remote low temp limit tripped */ 197 #define LM90_STATUS_RHIGH (1 << 4) /* remote high temp limit tripped */ 198 #define LM90_STATUS_LLOW (1 << 5) /* local low temp limit tripped */ 199 #define LM90_STATUS_LHIGH (1 << 6) /* local high temp limit tripped */ 200 201 #define MAX6696_STATUS2_R2THRM (1 << 1) /* remote2 THERM limit tripped */ 202 #define MAX6696_STATUS2_R2OPEN (1 << 2) /* remote2 is an open circuit */ 203 #define MAX6696_STATUS2_R2LOW (1 << 3) /* remote2 low temp limit tripped */ 204 #define MAX6696_STATUS2_R2HIGH (1 << 4) /* remote2 high temp limit tripped */ 205 #define MAX6696_STATUS2_ROT2 (1 << 5) /* remote emergency limit tripped */ 206 #define MAX6696_STATUS2_R2OT2 (1 << 6) /* remote2 emergency limit tripped */ 207 #define MAX6696_STATUS2_LOT2 (1 << 7) /* local emergency limit tripped */ 208 209 /* 210 * Driver data (common to all clients) 211 */ 212 213 static const struct i2c_device_id lm90_id[] = { 214 { "adm1032", adm1032 }, 215 { "adt7461", adt7461 }, 216 { "adt7461a", adt7461 }, 217 { "g781", g781 }, 218 { "lm90", lm90 }, 219 { "lm86", lm86 }, 220 { "lm89", lm86 }, 221 { "lm99", lm99 }, 222 { "max6646", max6646 }, 223 { "max6647", max6646 }, 224 { "max6649", max6646 }, 225 { "max6657", max6657 }, 226 { "max6658", max6657 }, 227 { "max6659", max6659 }, 228 { "max6680", max6680 }, 229 { "max6681", max6680 }, 230 { "max6695", max6696 }, 231 { "max6696", max6696 }, 232 { "nct1008", adt7461 }, 233 { "w83l771", w83l771 }, 234 { "sa56004", sa56004 }, 235 { "tmp451", tmp451 }, 236 { } 237 }; 238 MODULE_DEVICE_TABLE(i2c, lm90_id); 239 240 /* 241 * chip type specific parameters 242 */ 243 struct lm90_params { 244 u32 flags; /* Capabilities */ 245 u16 alert_alarms; /* Which alarm bits trigger ALERT# */ 246 /* Upper 8 bits for max6695/96 */ 247 u8 max_convrate; /* Maximum conversion rate register value */ 248 u8 reg_local_ext; /* Extended local temp register (optional) */ 249 }; 250 251 static const struct lm90_params lm90_params[] = { 252 [adm1032] = { 253 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT 254 | LM90_HAVE_BROKEN_ALERT, 255 .alert_alarms = 0x7c, 256 .max_convrate = 10, 257 }, 258 [adt7461] = { 259 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT 260 | LM90_HAVE_BROKEN_ALERT, 261 .alert_alarms = 0x7c, 262 .max_convrate = 10, 263 }, 264 [g781] = { 265 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT 266 | LM90_HAVE_BROKEN_ALERT, 267 .alert_alarms = 0x7c, 268 .max_convrate = 8, 269 }, 270 [lm86] = { 271 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT, 272 .alert_alarms = 0x7b, 273 .max_convrate = 9, 274 }, 275 [lm90] = { 276 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT, 277 .alert_alarms = 0x7b, 278 .max_convrate = 9, 279 }, 280 [lm99] = { 281 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT, 282 .alert_alarms = 0x7b, 283 .max_convrate = 9, 284 }, 285 [max6646] = { 286 .alert_alarms = 0x7c, 287 .max_convrate = 6, 288 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL, 289 }, 290 [max6657] = { 291 .alert_alarms = 0x7c, 292 .max_convrate = 8, 293 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL, 294 }, 295 [max6659] = { 296 .flags = LM90_HAVE_EMERGENCY, 297 .alert_alarms = 0x7c, 298 .max_convrate = 8, 299 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL, 300 }, 301 [max6680] = { 302 .flags = LM90_HAVE_OFFSET, 303 .alert_alarms = 0x7c, 304 .max_convrate = 7, 305 }, 306 [max6696] = { 307 .flags = LM90_HAVE_EMERGENCY 308 | LM90_HAVE_EMERGENCY_ALARM | LM90_HAVE_TEMP3, 309 .alert_alarms = 0x1c7c, 310 .max_convrate = 6, 311 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL, 312 }, 313 [w83l771] = { 314 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT, 315 .alert_alarms = 0x7c, 316 .max_convrate = 8, 317 }, 318 [sa56004] = { 319 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT, 320 .alert_alarms = 0x7b, 321 .max_convrate = 9, 322 .reg_local_ext = SA56004_REG_R_LOCAL_TEMPL, 323 }, 324 [tmp451] = { 325 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT 326 | LM90_HAVE_BROKEN_ALERT, 327 .alert_alarms = 0x7c, 328 .max_convrate = 9, 329 .reg_local_ext = TMP451_REG_R_LOCAL_TEMPL, 330 } 331 }; 332 333 /* 334 * TEMP8 register index 335 */ 336 enum lm90_temp8_reg_index { 337 LOCAL_LOW = 0, 338 LOCAL_HIGH, 339 LOCAL_CRIT, 340 REMOTE_CRIT, 341 LOCAL_EMERG, /* max6659 and max6695/96 */ 342 REMOTE_EMERG, /* max6659 and max6695/96 */ 343 REMOTE2_CRIT, /* max6695/96 only */ 344 REMOTE2_EMERG, /* max6695/96 only */ 345 TEMP8_REG_NUM 346 }; 347 348 /* 349 * TEMP11 register index 350 */ 351 enum lm90_temp11_reg_index { 352 REMOTE_TEMP = 0, 353 REMOTE_LOW, 354 REMOTE_HIGH, 355 REMOTE_OFFSET, /* except max6646, max6657/58/59, and max6695/96 */ 356 LOCAL_TEMP, 357 REMOTE2_TEMP, /* max6695/96 only */ 358 REMOTE2_LOW, /* max6695/96 only */ 359 REMOTE2_HIGH, /* max6695/96 only */ 360 TEMP11_REG_NUM 361 }; 362 363 /* 364 * Client data (each client gets its own) 365 */ 366 367 struct lm90_data { 368 struct i2c_client *client; 369 struct device *hwmon_dev; 370 const struct attribute_group *groups[6]; 371 struct mutex update_lock; 372 struct regulator *regulator; 373 char valid; /* zero until following fields are valid */ 374 unsigned long last_updated; /* in jiffies */ 375 int kind; 376 u32 flags; 377 378 unsigned int update_interval; /* in milliseconds */ 379 380 u8 config_orig; /* Original configuration register value */ 381 u8 convrate_orig; /* Original conversion rate register value */ 382 u16 alert_alarms; /* Which alarm bits trigger ALERT# */ 383 /* Upper 8 bits for max6695/96 */ 384 u8 max_convrate; /* Maximum conversion rate */ 385 u8 reg_local_ext; /* local extension register offset */ 386 387 /* registers values */ 388 s8 temp8[TEMP8_REG_NUM]; 389 s16 temp11[TEMP11_REG_NUM]; 390 u8 temp_hyst; 391 u16 alarms; /* bitvector (upper 8 bits for max6695/96) */ 392 }; 393 394 /* 395 * Support functions 396 */ 397 398 /* 399 * The ADM1032 supports PEC but not on write byte transactions, so we need 400 * to explicitly ask for a transaction without PEC. 401 */ 402 static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value) 403 { 404 return i2c_smbus_xfer(client->adapter, client->addr, 405 client->flags & ~I2C_CLIENT_PEC, 406 I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL); 407 } 408 409 /* 410 * It is assumed that client->update_lock is held (unless we are in 411 * detection or initialization steps). This matters when PEC is enabled, 412 * because we don't want the address pointer to change between the write 413 * byte and the read byte transactions. 414 */ 415 static int lm90_read_reg(struct i2c_client *client, u8 reg, u8 *value) 416 { 417 int err; 418 419 if (client->flags & I2C_CLIENT_PEC) { 420 err = adm1032_write_byte(client, reg); 421 if (err >= 0) 422 err = i2c_smbus_read_byte(client); 423 } else 424 err = i2c_smbus_read_byte_data(client, reg); 425 426 if (err < 0) { 427 dev_warn(&client->dev, "Register %#02x read failed (%d)\n", 428 reg, err); 429 return err; 430 } 431 *value = err; 432 433 return 0; 434 } 435 436 static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value) 437 { 438 int err; 439 u8 oldh, newh, l; 440 441 /* 442 * There is a trick here. We have to read two registers to have the 443 * sensor temperature, but we have to beware a conversion could occur 444 * between the readings. The datasheet says we should either use 445 * the one-shot conversion register, which we don't want to do 446 * (disables hardware monitoring) or monitor the busy bit, which is 447 * impossible (we can't read the values and monitor that bit at the 448 * exact same time). So the solution used here is to read the high 449 * byte once, then the low byte, then the high byte again. If the new 450 * high byte matches the old one, then we have a valid reading. Else 451 * we have to read the low byte again, and now we believe we have a 452 * correct reading. 453 */ 454 if ((err = lm90_read_reg(client, regh, &oldh)) 455 || (err = lm90_read_reg(client, regl, &l)) 456 || (err = lm90_read_reg(client, regh, &newh))) 457 return err; 458 if (oldh != newh) { 459 err = lm90_read_reg(client, regl, &l); 460 if (err) 461 return err; 462 } 463 *value = (newh << 8) | l; 464 465 return 0; 466 } 467 468 /* 469 * client->update_lock must be held when calling this function (unless we are 470 * in detection or initialization steps), and while a remote channel other 471 * than channel 0 is selected. Also, calling code must make sure to re-select 472 * external channel 0 before releasing the lock. This is necessary because 473 * various registers have different meanings as a result of selecting a 474 * non-default remote channel. 475 */ 476 static inline void lm90_select_remote_channel(struct i2c_client *client, 477 struct lm90_data *data, 478 int channel) 479 { 480 u8 config; 481 482 if (data->kind == max6696) { 483 lm90_read_reg(client, LM90_REG_R_CONFIG1, &config); 484 config &= ~0x08; 485 if (channel) 486 config |= 0x08; 487 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, 488 config); 489 } 490 } 491 492 /* 493 * Set conversion rate. 494 * client->update_lock must be held when calling this function (unless we are 495 * in detection or initialization steps). 496 */ 497 static void lm90_set_convrate(struct i2c_client *client, struct lm90_data *data, 498 unsigned int interval) 499 { 500 int i; 501 unsigned int update_interval; 502 503 /* Shift calculations to avoid rounding errors */ 504 interval <<= 6; 505 506 /* find the nearest update rate */ 507 for (i = 0, update_interval = LM90_MAX_CONVRATE_MS << 6; 508 i < data->max_convrate; i++, update_interval >>= 1) 509 if (interval >= update_interval * 3 / 4) 510 break; 511 512 i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, i); 513 data->update_interval = DIV_ROUND_CLOSEST(update_interval, 64); 514 } 515 516 static struct lm90_data *lm90_update_device(struct device *dev) 517 { 518 struct lm90_data *data = dev_get_drvdata(dev); 519 struct i2c_client *client = data->client; 520 unsigned long next_update; 521 522 mutex_lock(&data->update_lock); 523 524 next_update = data->last_updated + 525 msecs_to_jiffies(data->update_interval); 526 if (time_after(jiffies, next_update) || !data->valid) { 527 u8 h, l; 528 u8 alarms; 529 530 dev_dbg(&client->dev, "Updating lm90 data.\n"); 531 lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, 532 &data->temp8[LOCAL_LOW]); 533 lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, 534 &data->temp8[LOCAL_HIGH]); 535 lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, 536 &data->temp8[LOCAL_CRIT]); 537 lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, 538 &data->temp8[REMOTE_CRIT]); 539 lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst); 540 541 if (data->reg_local_ext) { 542 lm90_read16(client, LM90_REG_R_LOCAL_TEMP, 543 data->reg_local_ext, 544 &data->temp11[LOCAL_TEMP]); 545 } else { 546 if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP, 547 &h) == 0) 548 data->temp11[LOCAL_TEMP] = h << 8; 549 } 550 lm90_read16(client, LM90_REG_R_REMOTE_TEMPH, 551 LM90_REG_R_REMOTE_TEMPL, 552 &data->temp11[REMOTE_TEMP]); 553 554 if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) { 555 data->temp11[REMOTE_LOW] = h << 8; 556 if ((data->flags & LM90_HAVE_REM_LIMIT_EXT) 557 && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL, 558 &l) == 0) 559 data->temp11[REMOTE_LOW] |= l; 560 } 561 if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) { 562 data->temp11[REMOTE_HIGH] = h << 8; 563 if ((data->flags & LM90_HAVE_REM_LIMIT_EXT) 564 && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, 565 &l) == 0) 566 data->temp11[REMOTE_HIGH] |= l; 567 } 568 569 if (data->flags & LM90_HAVE_OFFSET) { 570 if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH, 571 &h) == 0 572 && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL, 573 &l) == 0) 574 data->temp11[REMOTE_OFFSET] = (h << 8) | l; 575 } 576 if (data->flags & LM90_HAVE_EMERGENCY) { 577 lm90_read_reg(client, MAX6659_REG_R_LOCAL_EMERG, 578 &data->temp8[LOCAL_EMERG]); 579 lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG, 580 &data->temp8[REMOTE_EMERG]); 581 } 582 lm90_read_reg(client, LM90_REG_R_STATUS, &alarms); 583 data->alarms = alarms; /* save as 16 bit value */ 584 585 if (data->kind == max6696) { 586 lm90_select_remote_channel(client, data, 1); 587 lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, 588 &data->temp8[REMOTE2_CRIT]); 589 lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG, 590 &data->temp8[REMOTE2_EMERG]); 591 lm90_read16(client, LM90_REG_R_REMOTE_TEMPH, 592 LM90_REG_R_REMOTE_TEMPL, 593 &data->temp11[REMOTE2_TEMP]); 594 if (!lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h)) 595 data->temp11[REMOTE2_LOW] = h << 8; 596 if (!lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h)) 597 data->temp11[REMOTE2_HIGH] = h << 8; 598 lm90_select_remote_channel(client, data, 0); 599 600 if (!lm90_read_reg(client, MAX6696_REG_R_STATUS2, 601 &alarms)) 602 data->alarms |= alarms << 8; 603 } 604 605 /* 606 * Re-enable ALERT# output if it was originally enabled and 607 * relevant alarms are all clear 608 */ 609 if ((data->config_orig & 0x80) == 0 610 && (data->alarms & data->alert_alarms) == 0) { 611 u8 config; 612 613 lm90_read_reg(client, LM90_REG_R_CONFIG1, &config); 614 if (config & 0x80) { 615 dev_dbg(&client->dev, "Re-enabling ALERT#\n"); 616 i2c_smbus_write_byte_data(client, 617 LM90_REG_W_CONFIG1, 618 config & ~0x80); 619 } 620 } 621 622 data->last_updated = jiffies; 623 data->valid = 1; 624 } 625 626 mutex_unlock(&data->update_lock); 627 628 return data; 629 } 630 631 /* 632 * Conversions 633 * For local temperatures and limits, critical limits and the hysteresis 634 * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius. 635 * For remote temperatures and limits, it uses signed 11-bit values with 636 * LSB = 0.125 degree Celsius, left-justified in 16-bit registers. Some 637 * Maxim chips use unsigned values. 638 */ 639 640 static inline int temp_from_s8(s8 val) 641 { 642 return val * 1000; 643 } 644 645 static inline int temp_from_u8(u8 val) 646 { 647 return val * 1000; 648 } 649 650 static inline int temp_from_s16(s16 val) 651 { 652 return val / 32 * 125; 653 } 654 655 static inline int temp_from_u16(u16 val) 656 { 657 return val / 32 * 125; 658 } 659 660 static s8 temp_to_s8(long val) 661 { 662 if (val <= -128000) 663 return -128; 664 if (val >= 127000) 665 return 127; 666 if (val < 0) 667 return (val - 500) / 1000; 668 return (val + 500) / 1000; 669 } 670 671 static u8 temp_to_u8(long val) 672 { 673 if (val <= 0) 674 return 0; 675 if (val >= 255000) 676 return 255; 677 return (val + 500) / 1000; 678 } 679 680 static s16 temp_to_s16(long val) 681 { 682 if (val <= -128000) 683 return 0x8000; 684 if (val >= 127875) 685 return 0x7FE0; 686 if (val < 0) 687 return (val - 62) / 125 * 32; 688 return (val + 62) / 125 * 32; 689 } 690 691 static u8 hyst_to_reg(long val) 692 { 693 if (val <= 0) 694 return 0; 695 if (val >= 30500) 696 return 31; 697 return (val + 500) / 1000; 698 } 699 700 /* 701 * ADT7461 in compatibility mode is almost identical to LM90 except that 702 * attempts to write values that are outside the range 0 < temp < 127 are 703 * treated as the boundary value. 704 * 705 * ADT7461 in "extended mode" operation uses unsigned integers offset by 706 * 64 (e.g., 0 -> -64 degC). The range is restricted to -64..191 degC. 707 */ 708 static inline int temp_from_u8_adt7461(struct lm90_data *data, u8 val) 709 { 710 if (data->flags & LM90_FLAG_ADT7461_EXT) 711 return (val - 64) * 1000; 712 else 713 return temp_from_s8(val); 714 } 715 716 static inline int temp_from_u16_adt7461(struct lm90_data *data, u16 val) 717 { 718 if (data->flags & LM90_FLAG_ADT7461_EXT) 719 return (val - 0x4000) / 64 * 250; 720 else 721 return temp_from_s16(val); 722 } 723 724 static u8 temp_to_u8_adt7461(struct lm90_data *data, long val) 725 { 726 if (data->flags & LM90_FLAG_ADT7461_EXT) { 727 if (val <= -64000) 728 return 0; 729 if (val >= 191000) 730 return 0xFF; 731 return (val + 500 + 64000) / 1000; 732 } else { 733 if (val <= 0) 734 return 0; 735 if (val >= 127000) 736 return 127; 737 return (val + 500) / 1000; 738 } 739 } 740 741 static u16 temp_to_u16_adt7461(struct lm90_data *data, long val) 742 { 743 if (data->flags & LM90_FLAG_ADT7461_EXT) { 744 if (val <= -64000) 745 return 0; 746 if (val >= 191750) 747 return 0xFFC0; 748 return (val + 64000 + 125) / 250 * 64; 749 } else { 750 if (val <= 0) 751 return 0; 752 if (val >= 127750) 753 return 0x7FC0; 754 return (val + 125) / 250 * 64; 755 } 756 } 757 758 /* 759 * Sysfs stuff 760 */ 761 762 static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr, 763 char *buf) 764 { 765 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 766 struct lm90_data *data = lm90_update_device(dev); 767 int temp; 768 769 if (data->kind == adt7461 || data->kind == tmp451) 770 temp = temp_from_u8_adt7461(data, data->temp8[attr->index]); 771 else if (data->kind == max6646) 772 temp = temp_from_u8(data->temp8[attr->index]); 773 else 774 temp = temp_from_s8(data->temp8[attr->index]); 775 776 /* +16 degrees offset for temp2 for the LM99 */ 777 if (data->kind == lm99 && attr->index == 3) 778 temp += 16000; 779 780 return sprintf(buf, "%d\n", temp); 781 } 782 783 static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr, 784 const char *buf, size_t count) 785 { 786 static const u8 reg[TEMP8_REG_NUM] = { 787 LM90_REG_W_LOCAL_LOW, 788 LM90_REG_W_LOCAL_HIGH, 789 LM90_REG_W_LOCAL_CRIT, 790 LM90_REG_W_REMOTE_CRIT, 791 MAX6659_REG_W_LOCAL_EMERG, 792 MAX6659_REG_W_REMOTE_EMERG, 793 LM90_REG_W_REMOTE_CRIT, 794 MAX6659_REG_W_REMOTE_EMERG, 795 }; 796 797 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 798 struct lm90_data *data = dev_get_drvdata(dev); 799 struct i2c_client *client = data->client; 800 int nr = attr->index; 801 long val; 802 int err; 803 804 err = kstrtol(buf, 10, &val); 805 if (err < 0) 806 return err; 807 808 /* +16 degrees offset for temp2 for the LM99 */ 809 if (data->kind == lm99 && attr->index == 3) 810 val -= 16000; 811 812 mutex_lock(&data->update_lock); 813 if (data->kind == adt7461 || data->kind == tmp451) 814 data->temp8[nr] = temp_to_u8_adt7461(data, val); 815 else if (data->kind == max6646) 816 data->temp8[nr] = temp_to_u8(val); 817 else 818 data->temp8[nr] = temp_to_s8(val); 819 820 lm90_select_remote_channel(client, data, nr >= 6); 821 i2c_smbus_write_byte_data(client, reg[nr], data->temp8[nr]); 822 lm90_select_remote_channel(client, data, 0); 823 824 mutex_unlock(&data->update_lock); 825 return count; 826 } 827 828 static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr, 829 char *buf) 830 { 831 struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr); 832 struct lm90_data *data = lm90_update_device(dev); 833 int temp; 834 835 if (data->kind == adt7461 || data->kind == tmp451) 836 temp = temp_from_u16_adt7461(data, data->temp11[attr->index]); 837 else if (data->kind == max6646) 838 temp = temp_from_u16(data->temp11[attr->index]); 839 else 840 temp = temp_from_s16(data->temp11[attr->index]); 841 842 /* +16 degrees offset for temp2 for the LM99 */ 843 if (data->kind == lm99 && attr->index <= 2) 844 temp += 16000; 845 846 return sprintf(buf, "%d\n", temp); 847 } 848 849 static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr, 850 const char *buf, size_t count) 851 { 852 struct { 853 u8 high; 854 u8 low; 855 int channel; 856 } reg[5] = { 857 { LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL, 0 }, 858 { LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL, 0 }, 859 { LM90_REG_W_REMOTE_OFFSH, LM90_REG_W_REMOTE_OFFSL, 0 }, 860 { LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL, 1 }, 861 { LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL, 1 } 862 }; 863 864 struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr); 865 struct lm90_data *data = dev_get_drvdata(dev); 866 struct i2c_client *client = data->client; 867 int nr = attr->nr; 868 int index = attr->index; 869 long val; 870 int err; 871 872 err = kstrtol(buf, 10, &val); 873 if (err < 0) 874 return err; 875 876 /* +16 degrees offset for temp2 for the LM99 */ 877 if (data->kind == lm99 && index <= 2) 878 val -= 16000; 879 880 mutex_lock(&data->update_lock); 881 if (data->kind == adt7461 || data->kind == tmp451) 882 data->temp11[index] = temp_to_u16_adt7461(data, val); 883 else if (data->kind == max6646) 884 data->temp11[index] = temp_to_u8(val) << 8; 885 else if (data->flags & LM90_HAVE_REM_LIMIT_EXT) 886 data->temp11[index] = temp_to_s16(val); 887 else 888 data->temp11[index] = temp_to_s8(val) << 8; 889 890 lm90_select_remote_channel(client, data, reg[nr].channel); 891 i2c_smbus_write_byte_data(client, reg[nr].high, 892 data->temp11[index] >> 8); 893 if (data->flags & LM90_HAVE_REM_LIMIT_EXT) 894 i2c_smbus_write_byte_data(client, reg[nr].low, 895 data->temp11[index] & 0xff); 896 lm90_select_remote_channel(client, data, 0); 897 898 mutex_unlock(&data->update_lock); 899 return count; 900 } 901 902 static ssize_t show_temphyst(struct device *dev, 903 struct device_attribute *devattr, 904 char *buf) 905 { 906 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 907 struct lm90_data *data = lm90_update_device(dev); 908 int temp; 909 910 if (data->kind == adt7461 || data->kind == tmp451) 911 temp = temp_from_u8_adt7461(data, data->temp8[attr->index]); 912 else if (data->kind == max6646) 913 temp = temp_from_u8(data->temp8[attr->index]); 914 else 915 temp = temp_from_s8(data->temp8[attr->index]); 916 917 /* +16 degrees offset for temp2 for the LM99 */ 918 if (data->kind == lm99 && attr->index == 3) 919 temp += 16000; 920 921 return sprintf(buf, "%d\n", temp - temp_from_s8(data->temp_hyst)); 922 } 923 924 static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy, 925 const char *buf, size_t count) 926 { 927 struct lm90_data *data = dev_get_drvdata(dev); 928 struct i2c_client *client = data->client; 929 long val; 930 int err; 931 int temp; 932 933 err = kstrtol(buf, 10, &val); 934 if (err < 0) 935 return err; 936 937 mutex_lock(&data->update_lock); 938 if (data->kind == adt7461 || data->kind == tmp451) 939 temp = temp_from_u8_adt7461(data, data->temp8[LOCAL_CRIT]); 940 else if (data->kind == max6646) 941 temp = temp_from_u8(data->temp8[LOCAL_CRIT]); 942 else 943 temp = temp_from_s8(data->temp8[LOCAL_CRIT]); 944 945 data->temp_hyst = hyst_to_reg(temp - val); 946 i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST, 947 data->temp_hyst); 948 mutex_unlock(&data->update_lock); 949 return count; 950 } 951 952 static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy, 953 char *buf) 954 { 955 struct lm90_data *data = lm90_update_device(dev); 956 return sprintf(buf, "%d\n", data->alarms); 957 } 958 959 static ssize_t show_alarm(struct device *dev, struct device_attribute 960 *devattr, char *buf) 961 { 962 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 963 struct lm90_data *data = lm90_update_device(dev); 964 int bitnr = attr->index; 965 966 return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1); 967 } 968 969 static ssize_t show_update_interval(struct device *dev, 970 struct device_attribute *attr, char *buf) 971 { 972 struct lm90_data *data = dev_get_drvdata(dev); 973 974 return sprintf(buf, "%u\n", data->update_interval); 975 } 976 977 static ssize_t set_update_interval(struct device *dev, 978 struct device_attribute *attr, 979 const char *buf, size_t count) 980 { 981 struct lm90_data *data = dev_get_drvdata(dev); 982 struct i2c_client *client = data->client; 983 unsigned long val; 984 int err; 985 986 err = kstrtoul(buf, 10, &val); 987 if (err) 988 return err; 989 990 mutex_lock(&data->update_lock); 991 lm90_set_convrate(client, data, clamp_val(val, 0, 100000)); 992 mutex_unlock(&data->update_lock); 993 994 return count; 995 } 996 997 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp11, NULL, 998 0, LOCAL_TEMP); 999 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp11, NULL, 1000 0, REMOTE_TEMP); 1001 static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8, 1002 set_temp8, LOCAL_LOW); 1003 static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp11, 1004 set_temp11, 0, REMOTE_LOW); 1005 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8, 1006 set_temp8, LOCAL_HIGH); 1007 static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp11, 1008 set_temp11, 1, REMOTE_HIGH); 1009 static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8, 1010 set_temp8, LOCAL_CRIT); 1011 static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8, 1012 set_temp8, REMOTE_CRIT); 1013 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst, 1014 set_temphyst, LOCAL_CRIT); 1015 static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 1016 REMOTE_CRIT); 1017 static SENSOR_DEVICE_ATTR_2(temp2_offset, S_IWUSR | S_IRUGO, show_temp11, 1018 set_temp11, 2, REMOTE_OFFSET); 1019 1020 /* Individual alarm files */ 1021 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0); 1022 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1); 1023 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2); 1024 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3); 1025 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4); 1026 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5); 1027 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6); 1028 /* Raw alarm file for compatibility */ 1029 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 1030 1031 static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval, 1032 set_update_interval); 1033 1034 static struct attribute *lm90_attributes[] = { 1035 &sensor_dev_attr_temp1_input.dev_attr.attr, 1036 &sensor_dev_attr_temp2_input.dev_attr.attr, 1037 &sensor_dev_attr_temp1_min.dev_attr.attr, 1038 &sensor_dev_attr_temp2_min.dev_attr.attr, 1039 &sensor_dev_attr_temp1_max.dev_attr.attr, 1040 &sensor_dev_attr_temp2_max.dev_attr.attr, 1041 &sensor_dev_attr_temp1_crit.dev_attr.attr, 1042 &sensor_dev_attr_temp2_crit.dev_attr.attr, 1043 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr, 1044 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr, 1045 1046 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, 1047 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, 1048 &sensor_dev_attr_temp2_fault.dev_attr.attr, 1049 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, 1050 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, 1051 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, 1052 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, 1053 &dev_attr_alarms.attr, 1054 &dev_attr_update_interval.attr, 1055 NULL 1056 }; 1057 1058 static const struct attribute_group lm90_group = { 1059 .attrs = lm90_attributes, 1060 }; 1061 1062 static struct attribute *lm90_temp2_offset_attributes[] = { 1063 &sensor_dev_attr_temp2_offset.dev_attr.attr, 1064 NULL 1065 }; 1066 1067 static const struct attribute_group lm90_temp2_offset_group = { 1068 .attrs = lm90_temp2_offset_attributes, 1069 }; 1070 1071 /* 1072 * Additional attributes for devices with emergency sensors 1073 */ 1074 static SENSOR_DEVICE_ATTR(temp1_emergency, S_IWUSR | S_IRUGO, show_temp8, 1075 set_temp8, LOCAL_EMERG); 1076 static SENSOR_DEVICE_ATTR(temp2_emergency, S_IWUSR | S_IRUGO, show_temp8, 1077 set_temp8, REMOTE_EMERG); 1078 static SENSOR_DEVICE_ATTR(temp1_emergency_hyst, S_IRUGO, show_temphyst, 1079 NULL, LOCAL_EMERG); 1080 static SENSOR_DEVICE_ATTR(temp2_emergency_hyst, S_IRUGO, show_temphyst, 1081 NULL, REMOTE_EMERG); 1082 1083 static struct attribute *lm90_emergency_attributes[] = { 1084 &sensor_dev_attr_temp1_emergency.dev_attr.attr, 1085 &sensor_dev_attr_temp2_emergency.dev_attr.attr, 1086 &sensor_dev_attr_temp1_emergency_hyst.dev_attr.attr, 1087 &sensor_dev_attr_temp2_emergency_hyst.dev_attr.attr, 1088 NULL 1089 }; 1090 1091 static const struct attribute_group lm90_emergency_group = { 1092 .attrs = lm90_emergency_attributes, 1093 }; 1094 1095 static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, show_alarm, NULL, 15); 1096 static SENSOR_DEVICE_ATTR(temp2_emergency_alarm, S_IRUGO, show_alarm, NULL, 13); 1097 1098 static struct attribute *lm90_emergency_alarm_attributes[] = { 1099 &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr, 1100 &sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr, 1101 NULL 1102 }; 1103 1104 static const struct attribute_group lm90_emergency_alarm_group = { 1105 .attrs = lm90_emergency_alarm_attributes, 1106 }; 1107 1108 /* 1109 * Additional attributes for devices with 3 temperature sensors 1110 */ 1111 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp11, NULL, 1112 0, REMOTE2_TEMP); 1113 static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp11, 1114 set_temp11, 3, REMOTE2_LOW); 1115 static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp11, 1116 set_temp11, 4, REMOTE2_HIGH); 1117 static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp8, 1118 set_temp8, REMOTE2_CRIT); 1119 static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temphyst, NULL, 1120 REMOTE2_CRIT); 1121 static SENSOR_DEVICE_ATTR(temp3_emergency, S_IWUSR | S_IRUGO, show_temp8, 1122 set_temp8, REMOTE2_EMERG); 1123 static SENSOR_DEVICE_ATTR(temp3_emergency_hyst, S_IRUGO, show_temphyst, 1124 NULL, REMOTE2_EMERG); 1125 1126 static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 9); 1127 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 10); 1128 static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_alarm, NULL, 11); 1129 static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 12); 1130 static SENSOR_DEVICE_ATTR(temp3_emergency_alarm, S_IRUGO, show_alarm, NULL, 14); 1131 1132 static struct attribute *lm90_temp3_attributes[] = { 1133 &sensor_dev_attr_temp3_input.dev_attr.attr, 1134 &sensor_dev_attr_temp3_min.dev_attr.attr, 1135 &sensor_dev_attr_temp3_max.dev_attr.attr, 1136 &sensor_dev_attr_temp3_crit.dev_attr.attr, 1137 &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr, 1138 &sensor_dev_attr_temp3_emergency.dev_attr.attr, 1139 &sensor_dev_attr_temp3_emergency_hyst.dev_attr.attr, 1140 1141 &sensor_dev_attr_temp3_fault.dev_attr.attr, 1142 &sensor_dev_attr_temp3_min_alarm.dev_attr.attr, 1143 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr, 1144 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr, 1145 &sensor_dev_attr_temp3_emergency_alarm.dev_attr.attr, 1146 NULL 1147 }; 1148 1149 static const struct attribute_group lm90_temp3_group = { 1150 .attrs = lm90_temp3_attributes, 1151 }; 1152 1153 /* pec used for ADM1032 only */ 1154 static ssize_t show_pec(struct device *dev, struct device_attribute *dummy, 1155 char *buf) 1156 { 1157 struct i2c_client *client = to_i2c_client(dev); 1158 return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC)); 1159 } 1160 1161 static ssize_t set_pec(struct device *dev, struct device_attribute *dummy, 1162 const char *buf, size_t count) 1163 { 1164 struct i2c_client *client = to_i2c_client(dev); 1165 long val; 1166 int err; 1167 1168 err = kstrtol(buf, 10, &val); 1169 if (err < 0) 1170 return err; 1171 1172 switch (val) { 1173 case 0: 1174 client->flags &= ~I2C_CLIENT_PEC; 1175 break; 1176 case 1: 1177 client->flags |= I2C_CLIENT_PEC; 1178 break; 1179 default: 1180 return -EINVAL; 1181 } 1182 1183 return count; 1184 } 1185 1186 static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec); 1187 1188 /* 1189 * Real code 1190 */ 1191 1192 /* Return 0 if detection is successful, -ENODEV otherwise */ 1193 static int lm90_detect(struct i2c_client *client, 1194 struct i2c_board_info *info) 1195 { 1196 struct i2c_adapter *adapter = client->adapter; 1197 int address = client->addr; 1198 const char *name = NULL; 1199 int man_id, chip_id, config1, config2, convrate; 1200 1201 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 1202 return -ENODEV; 1203 1204 /* detection and identification */ 1205 man_id = i2c_smbus_read_byte_data(client, LM90_REG_R_MAN_ID); 1206 chip_id = i2c_smbus_read_byte_data(client, LM90_REG_R_CHIP_ID); 1207 config1 = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG1); 1208 convrate = i2c_smbus_read_byte_data(client, LM90_REG_R_CONVRATE); 1209 if (man_id < 0 || chip_id < 0 || config1 < 0 || convrate < 0) 1210 return -ENODEV; 1211 1212 if (man_id == 0x01 || man_id == 0x5C || man_id == 0x41) { 1213 config2 = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG2); 1214 if (config2 < 0) 1215 return -ENODEV; 1216 } else 1217 config2 = 0; /* Make compiler happy */ 1218 1219 if ((address == 0x4C || address == 0x4D) 1220 && man_id == 0x01) { /* National Semiconductor */ 1221 if ((config1 & 0x2A) == 0x00 1222 && (config2 & 0xF8) == 0x00 1223 && convrate <= 0x09) { 1224 if (address == 0x4C 1225 && (chip_id & 0xF0) == 0x20) { /* LM90 */ 1226 name = "lm90"; 1227 } else 1228 if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */ 1229 name = "lm99"; 1230 dev_info(&adapter->dev, 1231 "Assuming LM99 chip at 0x%02x\n", 1232 address); 1233 dev_info(&adapter->dev, 1234 "If it is an LM89, instantiate it " 1235 "with the new_device sysfs " 1236 "interface\n"); 1237 } else 1238 if (address == 0x4C 1239 && (chip_id & 0xF0) == 0x10) { /* LM86 */ 1240 name = "lm86"; 1241 } 1242 } 1243 } else 1244 if ((address == 0x4C || address == 0x4D) 1245 && man_id == 0x41) { /* Analog Devices */ 1246 if ((chip_id & 0xF0) == 0x40 /* ADM1032 */ 1247 && (config1 & 0x3F) == 0x00 1248 && convrate <= 0x0A) { 1249 name = "adm1032"; 1250 /* 1251 * The ADM1032 supports PEC, but only if combined 1252 * transactions are not used. 1253 */ 1254 if (i2c_check_functionality(adapter, 1255 I2C_FUNC_SMBUS_BYTE)) 1256 info->flags |= I2C_CLIENT_PEC; 1257 } else 1258 if (chip_id == 0x51 /* ADT7461 */ 1259 && (config1 & 0x1B) == 0x00 1260 && convrate <= 0x0A) { 1261 name = "adt7461"; 1262 } else 1263 if (chip_id == 0x57 /* ADT7461A, NCT1008 */ 1264 && (config1 & 0x1B) == 0x00 1265 && convrate <= 0x0A) { 1266 name = "adt7461a"; 1267 } 1268 } else 1269 if (man_id == 0x4D) { /* Maxim */ 1270 int emerg, emerg2, status2; 1271 1272 /* 1273 * We read MAX6659_REG_R_REMOTE_EMERG twice, and re-read 1274 * LM90_REG_R_MAN_ID in between. If MAX6659_REG_R_REMOTE_EMERG 1275 * exists, both readings will reflect the same value. Otherwise, 1276 * the readings will be different. 1277 */ 1278 emerg = i2c_smbus_read_byte_data(client, 1279 MAX6659_REG_R_REMOTE_EMERG); 1280 man_id = i2c_smbus_read_byte_data(client, 1281 LM90_REG_R_MAN_ID); 1282 emerg2 = i2c_smbus_read_byte_data(client, 1283 MAX6659_REG_R_REMOTE_EMERG); 1284 status2 = i2c_smbus_read_byte_data(client, 1285 MAX6696_REG_R_STATUS2); 1286 if (emerg < 0 || man_id < 0 || emerg2 < 0 || status2 < 0) 1287 return -ENODEV; 1288 1289 /* 1290 * The MAX6657, MAX6658 and MAX6659 do NOT have a chip_id 1291 * register. Reading from that address will return the last 1292 * read value, which in our case is those of the man_id 1293 * register. Likewise, the config1 register seems to lack a 1294 * low nibble, so the value will be those of the previous 1295 * read, so in our case those of the man_id register. 1296 * MAX6659 has a third set of upper temperature limit registers. 1297 * Those registers also return values on MAX6657 and MAX6658, 1298 * thus the only way to detect MAX6659 is by its address. 1299 * For this reason it will be mis-detected as MAX6657 if its 1300 * address is 0x4C. 1301 */ 1302 if (chip_id == man_id 1303 && (address == 0x4C || address == 0x4D || address == 0x4E) 1304 && (config1 & 0x1F) == (man_id & 0x0F) 1305 && convrate <= 0x09) { 1306 if (address == 0x4C) 1307 name = "max6657"; 1308 else 1309 name = "max6659"; 1310 } else 1311 /* 1312 * Even though MAX6695 and MAX6696 do not have a chip ID 1313 * register, reading it returns 0x01. Bit 4 of the config1 1314 * register is unused and should return zero when read. Bit 0 of 1315 * the status2 register is unused and should return zero when 1316 * read. 1317 * 1318 * MAX6695 and MAX6696 have an additional set of temperature 1319 * limit registers. We can detect those chips by checking if 1320 * one of those registers exists. 1321 */ 1322 if (chip_id == 0x01 1323 && (config1 & 0x10) == 0x00 1324 && (status2 & 0x01) == 0x00 1325 && emerg == emerg2 1326 && convrate <= 0x07) { 1327 name = "max6696"; 1328 } else 1329 /* 1330 * The chip_id register of the MAX6680 and MAX6681 holds the 1331 * revision of the chip. The lowest bit of the config1 register 1332 * is unused and should return zero when read, so should the 1333 * second to last bit of config1 (software reset). 1334 */ 1335 if (chip_id == 0x01 1336 && (config1 & 0x03) == 0x00 1337 && convrate <= 0x07) { 1338 name = "max6680"; 1339 } else 1340 /* 1341 * The chip_id register of the MAX6646/6647/6649 holds the 1342 * revision of the chip. The lowest 6 bits of the config1 1343 * register are unused and should return zero when read. 1344 */ 1345 if (chip_id == 0x59 1346 && (config1 & 0x3f) == 0x00 1347 && convrate <= 0x07) { 1348 name = "max6646"; 1349 } 1350 } else 1351 if (address == 0x4C 1352 && man_id == 0x5C) { /* Winbond/Nuvoton */ 1353 if ((config1 & 0x2A) == 0x00 1354 && (config2 & 0xF8) == 0x00) { 1355 if (chip_id == 0x01 /* W83L771W/G */ 1356 && convrate <= 0x09) { 1357 name = "w83l771"; 1358 } else 1359 if ((chip_id & 0xFE) == 0x10 /* W83L771AWG/ASG */ 1360 && convrate <= 0x08) { 1361 name = "w83l771"; 1362 } 1363 } 1364 } else 1365 if (address >= 0x48 && address <= 0x4F 1366 && man_id == 0xA1) { /* NXP Semiconductor/Philips */ 1367 if (chip_id == 0x00 1368 && (config1 & 0x2A) == 0x00 1369 && (config2 & 0xFE) == 0x00 1370 && convrate <= 0x09) { 1371 name = "sa56004"; 1372 } 1373 } else 1374 if ((address == 0x4C || address == 0x4D) 1375 && man_id == 0x47) { /* GMT */ 1376 if (chip_id == 0x01 /* G781 */ 1377 && (config1 & 0x3F) == 0x00 1378 && convrate <= 0x08) 1379 name = "g781"; 1380 } else 1381 if (address == 0x4C 1382 && man_id == 0x55) { /* Texas Instruments */ 1383 int local_ext; 1384 1385 local_ext = i2c_smbus_read_byte_data(client, 1386 TMP451_REG_R_LOCAL_TEMPL); 1387 1388 if (chip_id == 0x00 /* TMP451 */ 1389 && (config1 & 0x1B) == 0x00 1390 && convrate <= 0x09 1391 && (local_ext & 0x0F) == 0x00) 1392 name = "tmp451"; 1393 } 1394 1395 if (!name) { /* identification failed */ 1396 dev_dbg(&adapter->dev, 1397 "Unsupported chip at 0x%02x (man_id=0x%02X, " 1398 "chip_id=0x%02X)\n", address, man_id, chip_id); 1399 return -ENODEV; 1400 } 1401 1402 strlcpy(info->type, name, I2C_NAME_SIZE); 1403 1404 return 0; 1405 } 1406 1407 static void lm90_restore_conf(struct i2c_client *client, struct lm90_data *data) 1408 { 1409 /* Restore initial configuration */ 1410 i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, 1411 data->convrate_orig); 1412 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, 1413 data->config_orig); 1414 } 1415 1416 static void lm90_init_client(struct i2c_client *client, struct lm90_data *data) 1417 { 1418 u8 config, convrate; 1419 1420 if (lm90_read_reg(client, LM90_REG_R_CONVRATE, &convrate) < 0) { 1421 dev_warn(&client->dev, "Failed to read convrate register!\n"); 1422 convrate = LM90_DEF_CONVRATE_RVAL; 1423 } 1424 data->convrate_orig = convrate; 1425 1426 /* 1427 * Start the conversions. 1428 */ 1429 lm90_set_convrate(client, data, 500); /* 500ms; 2Hz conversion rate */ 1430 if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) { 1431 dev_warn(&client->dev, "Initialization failed!\n"); 1432 return; 1433 } 1434 data->config_orig = config; 1435 1436 /* Check Temperature Range Select */ 1437 if (data->kind == adt7461 || data->kind == tmp451) { 1438 if (config & 0x04) 1439 data->flags |= LM90_FLAG_ADT7461_EXT; 1440 } 1441 1442 /* 1443 * Put MAX6680/MAX8881 into extended resolution (bit 0x10, 1444 * 0.125 degree resolution) and range (0x08, extend range 1445 * to -64 degree) mode for the remote temperature sensor. 1446 */ 1447 if (data->kind == max6680) 1448 config |= 0x18; 1449 1450 /* 1451 * Select external channel 0 for max6695/96 1452 */ 1453 if (data->kind == max6696) 1454 config &= ~0x08; 1455 1456 config &= 0xBF; /* run */ 1457 if (config != data->config_orig) /* Only write if changed */ 1458 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config); 1459 } 1460 1461 static bool lm90_is_tripped(struct i2c_client *client, u16 *status) 1462 { 1463 struct lm90_data *data = i2c_get_clientdata(client); 1464 u8 st, st2 = 0; 1465 1466 lm90_read_reg(client, LM90_REG_R_STATUS, &st); 1467 1468 if (data->kind == max6696) 1469 lm90_read_reg(client, MAX6696_REG_R_STATUS2, &st2); 1470 1471 *status = st | (st2 << 8); 1472 1473 if ((st & 0x7f) == 0 && (st2 & 0xfe) == 0) 1474 return false; 1475 1476 if ((st & (LM90_STATUS_LLOW | LM90_STATUS_LHIGH | LM90_STATUS_LTHRM)) || 1477 (st2 & MAX6696_STATUS2_LOT2)) 1478 dev_warn(&client->dev, 1479 "temp%d out of range, please check!\n", 1); 1480 if ((st & (LM90_STATUS_RLOW | LM90_STATUS_RHIGH | LM90_STATUS_RTHRM)) || 1481 (st2 & MAX6696_STATUS2_ROT2)) 1482 dev_warn(&client->dev, 1483 "temp%d out of range, please check!\n", 2); 1484 if (st & LM90_STATUS_ROPEN) 1485 dev_warn(&client->dev, 1486 "temp%d diode open, please check!\n", 2); 1487 if (st2 & (MAX6696_STATUS2_R2LOW | MAX6696_STATUS2_R2HIGH | 1488 MAX6696_STATUS2_R2THRM | MAX6696_STATUS2_R2OT2)) 1489 dev_warn(&client->dev, 1490 "temp%d out of range, please check!\n", 3); 1491 if (st2 & MAX6696_STATUS2_R2OPEN) 1492 dev_warn(&client->dev, 1493 "temp%d diode open, please check!\n", 3); 1494 1495 return true; 1496 } 1497 1498 static irqreturn_t lm90_irq_thread(int irq, void *dev_id) 1499 { 1500 struct i2c_client *client = dev_id; 1501 u16 status; 1502 1503 if (lm90_is_tripped(client, &status)) 1504 return IRQ_HANDLED; 1505 else 1506 return IRQ_NONE; 1507 } 1508 1509 static int lm90_probe(struct i2c_client *client, 1510 const struct i2c_device_id *id) 1511 { 1512 struct device *dev = &client->dev; 1513 struct i2c_adapter *adapter = to_i2c_adapter(dev->parent); 1514 struct lm90_data *data; 1515 struct regulator *regulator; 1516 int groups = 0; 1517 int err; 1518 1519 regulator = devm_regulator_get(dev, "vcc"); 1520 if (IS_ERR(regulator)) 1521 return PTR_ERR(regulator); 1522 1523 err = regulator_enable(regulator); 1524 if (err < 0) { 1525 dev_err(dev, "Failed to enable regulator: %d\n", err); 1526 return err; 1527 } 1528 1529 data = devm_kzalloc(dev, sizeof(struct lm90_data), GFP_KERNEL); 1530 if (!data) 1531 return -ENOMEM; 1532 1533 data->client = client; 1534 i2c_set_clientdata(client, data); 1535 mutex_init(&data->update_lock); 1536 1537 data->regulator = regulator; 1538 1539 /* Set the device type */ 1540 data->kind = id->driver_data; 1541 if (data->kind == adm1032) { 1542 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) 1543 client->flags &= ~I2C_CLIENT_PEC; 1544 } 1545 1546 /* 1547 * Different devices have different alarm bits triggering the 1548 * ALERT# output 1549 */ 1550 data->alert_alarms = lm90_params[data->kind].alert_alarms; 1551 1552 /* Set chip capabilities */ 1553 data->flags = lm90_params[data->kind].flags; 1554 data->reg_local_ext = lm90_params[data->kind].reg_local_ext; 1555 1556 /* Set maximum conversion rate */ 1557 data->max_convrate = lm90_params[data->kind].max_convrate; 1558 1559 /* Initialize the LM90 chip */ 1560 lm90_init_client(client, data); 1561 1562 /* Register sysfs hooks */ 1563 data->groups[groups++] = &lm90_group; 1564 1565 if (data->flags & LM90_HAVE_OFFSET) 1566 data->groups[groups++] = &lm90_temp2_offset_group; 1567 1568 if (data->flags & LM90_HAVE_EMERGENCY) 1569 data->groups[groups++] = &lm90_emergency_group; 1570 1571 if (data->flags & LM90_HAVE_EMERGENCY_ALARM) 1572 data->groups[groups++] = &lm90_emergency_alarm_group; 1573 1574 if (data->flags & LM90_HAVE_TEMP3) 1575 data->groups[groups++] = &lm90_temp3_group; 1576 1577 if (client->flags & I2C_CLIENT_PEC) { 1578 err = device_create_file(dev, &dev_attr_pec); 1579 if (err) 1580 goto exit_restore; 1581 } 1582 1583 data->hwmon_dev = hwmon_device_register_with_groups(dev, client->name, 1584 data, data->groups); 1585 if (IS_ERR(data->hwmon_dev)) { 1586 err = PTR_ERR(data->hwmon_dev); 1587 goto exit_remove_pec; 1588 } 1589 1590 if (client->irq) { 1591 dev_dbg(dev, "IRQ: %d\n", client->irq); 1592 err = devm_request_threaded_irq(dev, client->irq, 1593 NULL, lm90_irq_thread, 1594 IRQF_TRIGGER_LOW | IRQF_ONESHOT, 1595 "lm90", client); 1596 if (err < 0) { 1597 dev_err(dev, "cannot request IRQ %d\n", client->irq); 1598 goto exit_unregister; 1599 } 1600 } 1601 1602 return 0; 1603 1604 exit_unregister: 1605 hwmon_device_unregister(data->hwmon_dev); 1606 exit_remove_pec: 1607 device_remove_file(dev, &dev_attr_pec); 1608 exit_restore: 1609 lm90_restore_conf(client, data); 1610 regulator_disable(data->regulator); 1611 1612 return err; 1613 } 1614 1615 static int lm90_remove(struct i2c_client *client) 1616 { 1617 struct lm90_data *data = i2c_get_clientdata(client); 1618 1619 hwmon_device_unregister(data->hwmon_dev); 1620 device_remove_file(&client->dev, &dev_attr_pec); 1621 lm90_restore_conf(client, data); 1622 regulator_disable(data->regulator); 1623 1624 return 0; 1625 } 1626 1627 static void lm90_alert(struct i2c_client *client, unsigned int flag) 1628 { 1629 u16 alarms; 1630 1631 if (lm90_is_tripped(client, &alarms)) { 1632 /* 1633 * Disable ALERT# output, because these chips don't implement 1634 * SMBus alert correctly; they should only hold the alert line 1635 * low briefly. 1636 */ 1637 struct lm90_data *data = i2c_get_clientdata(client); 1638 1639 if ((data->flags & LM90_HAVE_BROKEN_ALERT) 1640 && (alarms & data->alert_alarms)) { 1641 u8 config; 1642 dev_dbg(&client->dev, "Disabling ALERT#\n"); 1643 lm90_read_reg(client, LM90_REG_R_CONFIG1, &config); 1644 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, 1645 config | 0x80); 1646 } 1647 } else { 1648 dev_info(&client->dev, "Everything OK\n"); 1649 } 1650 } 1651 1652 static struct i2c_driver lm90_driver = { 1653 .class = I2C_CLASS_HWMON, 1654 .driver = { 1655 .name = "lm90", 1656 }, 1657 .probe = lm90_probe, 1658 .remove = lm90_remove, 1659 .alert = lm90_alert, 1660 .id_table = lm90_id, 1661 .detect = lm90_detect, 1662 .address_list = normal_i2c, 1663 }; 1664 1665 module_i2c_driver(lm90_driver); 1666 1667 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>"); 1668 MODULE_DESCRIPTION("LM90/ADM1032 driver"); 1669 MODULE_LICENSE("GPL"); 1670