1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Driver for Texas Instruments TMP512, TMP513 power monitor chips 4 * 5 * TMP513: 6 * Thermal/Power Management with Triple Remote and 7 * Local Temperature Sensor and Current Shunt Monitor 8 * Datasheet: https://www.ti.com/lit/gpn/tmp513 9 * 10 * TMP512: 11 * Thermal/Power Management with Dual Remote 12 * and Local Temperature Sensor and Current Shunt Monitor 13 * Datasheet: https://www.ti.com/lit/gpn/tmp512 14 * 15 * Copyright (C) 2019 Eric Tremblay <etremblay@distech-controls.com> 16 * 17 * This program is free software; you can redistribute it and/or modify 18 * it under the terms of the GNU General Public License as published by 19 * the Free Software Foundation; version 2 of the License. 20 */ 21 22 #include <linux/bitops.h> 23 #include <linux/bug.h> 24 #include <linux/device.h> 25 #include <linux/err.h> 26 #include <linux/hwmon.h> 27 #include <linux/i2c.h> 28 #include <linux/init.h> 29 #include <linux/math.h> 30 #include <linux/module.h> 31 #include <linux/property.h> 32 #include <linux/regmap.h> 33 #include <linux/slab.h> 34 #include <linux/types.h> 35 #include <linux/units.h> 36 37 // Common register definition 38 #define TMP51X_SHUNT_CONFIG 0x00 39 #define TMP51X_TEMP_CONFIG 0x01 40 #define TMP51X_STATUS 0x02 41 #define TMP51X_SMBUS_ALERT 0x03 42 #define TMP51X_SHUNT_CURRENT_RESULT 0x04 43 #define TMP51X_BUS_VOLTAGE_RESULT 0x05 44 #define TMP51X_POWER_RESULT 0x06 45 #define TMP51X_BUS_CURRENT_RESULT 0x07 46 #define TMP51X_LOCAL_TEMP_RESULT 0x08 47 #define TMP51X_REMOTE_TEMP_RESULT_1 0x09 48 #define TMP51X_REMOTE_TEMP_RESULT_2 0x0A 49 #define TMP51X_SHUNT_CURRENT_H_LIMIT 0x0C 50 #define TMP51X_SHUNT_CURRENT_L_LIMIT 0x0D 51 #define TMP51X_BUS_VOLTAGE_H_LIMIT 0x0E 52 #define TMP51X_BUS_VOLTAGE_L_LIMIT 0x0F 53 #define TMP51X_POWER_LIMIT 0x10 54 #define TMP51X_LOCAL_TEMP_LIMIT 0x11 55 #define TMP51X_REMOTE_TEMP_LIMIT_1 0x12 56 #define TMP51X_REMOTE_TEMP_LIMIT_2 0x13 57 #define TMP51X_SHUNT_CALIBRATION 0x15 58 #define TMP51X_N_FACTOR_AND_HYST_1 0x16 59 #define TMP51X_N_FACTOR_2 0x17 60 #define TMP51X_MAN_ID_REG 0xFE 61 #define TMP51X_DEVICE_ID_REG 0xFF 62 63 // TMP513 specific register definition 64 #define TMP513_REMOTE_TEMP_RESULT_3 0x0B 65 #define TMP513_REMOTE_TEMP_LIMIT_3 0x14 66 #define TMP513_N_FACTOR_3 0x18 67 68 // Common attrs, and NULL 69 #define TMP51X_MANUFACTURER_ID 0x55FF 70 71 #define TMP512_DEVICE_ID 0x22FF 72 #define TMP513_DEVICE_ID 0x23FF 73 74 // Default config 75 #define TMP51X_SHUNT_CONFIG_DEFAULT 0x399F 76 #define TMP51X_SHUNT_VALUE_DEFAULT 1000 77 #define TMP51X_VBUS_RANGE_DEFAULT TMP51X_VBUS_RANGE_32V 78 #define TMP51X_PGA_DEFAULT 8 79 #define TMP51X_MAX_REGISTER_ADDR 0xFF 80 81 // Mask and shift 82 #define CURRENT_SENSE_VOLTAGE_320_MASK 0x1800 83 #define CURRENT_SENSE_VOLTAGE_160_MASK 0x1000 84 #define CURRENT_SENSE_VOLTAGE_80_MASK 0x0800 85 #define CURRENT_SENSE_VOLTAGE_40_MASK 0 86 87 #define TMP51X_BUS_VOLTAGE_MASK 0x2000 88 #define TMP51X_NFACTOR_MASK 0xFF00 89 #define TMP51X_HYST_MASK 0x00FF 90 91 #define TMP51X_BUS_VOLTAGE_SHIFT 3 92 #define TMP51X_TEMP_SHIFT 3 93 94 // Alarms 95 #define TMP51X_SHUNT_CURRENT_H_LIMIT_POS 15 96 #define TMP51X_SHUNT_CURRENT_L_LIMIT_POS 14 97 #define TMP51X_BUS_VOLTAGE_H_LIMIT_POS 13 98 #define TMP51X_BUS_VOLTAGE_L_LIMIT_POS 12 99 #define TMP51X_POWER_LIMIT_POS 11 100 #define TMP51X_LOCAL_TEMP_LIMIT_POS 10 101 #define TMP51X_REMOTE_TEMP_LIMIT_1_POS 9 102 #define TMP51X_REMOTE_TEMP_LIMIT_2_POS 8 103 #define TMP513_REMOTE_TEMP_LIMIT_3_POS 7 104 105 #define TMP51X_VBUS_RANGE_32V (32 * MICRO) 106 #define TMP51X_VBUS_RANGE_16V (16 * MICRO) 107 108 // Max and Min value 109 #define MAX_BUS_VOLTAGE_32_LIMIT 32764 110 #define MAX_BUS_VOLTAGE_16_LIMIT 16382 111 112 // Max possible value is -256 to +256 but datasheet indicated -40 to 125. 113 #define MAX_TEMP_LIMIT 125000 114 #define MIN_TEMP_LIMIT -40000 115 116 #define MAX_TEMP_HYST 127500 117 118 #define TMP512_MAX_CHANNELS 3 119 #define TMP513_MAX_CHANNELS 4 120 121 #define TMP51X_TEMP_CONFIG_CONV_RATE GENMASK(9, 7) 122 #define TMP51X_TEMP_CONFIG_RC BIT(10) 123 #define TMP51X_TEMP_CHANNEL_MASK(n) (GENMASK((n) - 1, 0) << 11) 124 #define TMP51X_TEMP_CONFIG_CONT BIT(15) 125 #define TMP51X_TEMP_CONFIG_DEFAULT(n) \ 126 (TMP51X_TEMP_CHANNEL_MASK(n) | TMP51X_TEMP_CONFIG_CONT | \ 127 TMP51X_TEMP_CONFIG_CONV_RATE | TMP51X_TEMP_CONFIG_RC) 128 129 static const u8 TMP51X_TEMP_INPUT[4] = { 130 TMP51X_LOCAL_TEMP_RESULT, 131 TMP51X_REMOTE_TEMP_RESULT_1, 132 TMP51X_REMOTE_TEMP_RESULT_2, 133 TMP513_REMOTE_TEMP_RESULT_3 134 }; 135 136 static const u8 TMP51X_TEMP_CRIT[4] = { 137 TMP51X_LOCAL_TEMP_LIMIT, 138 TMP51X_REMOTE_TEMP_LIMIT_1, 139 TMP51X_REMOTE_TEMP_LIMIT_2, 140 TMP513_REMOTE_TEMP_LIMIT_3 141 }; 142 143 static const u8 TMP51X_TEMP_CRIT_ALARM[4] = { 144 TMP51X_LOCAL_TEMP_LIMIT_POS, 145 TMP51X_REMOTE_TEMP_LIMIT_1_POS, 146 TMP51X_REMOTE_TEMP_LIMIT_2_POS, 147 TMP513_REMOTE_TEMP_LIMIT_3_POS 148 }; 149 150 static const u8 TMP51X_TEMP_CRIT_HYST[4] = { 151 TMP51X_N_FACTOR_AND_HYST_1, 152 TMP51X_N_FACTOR_AND_HYST_1, 153 TMP51X_N_FACTOR_AND_HYST_1, 154 TMP51X_N_FACTOR_AND_HYST_1 155 }; 156 157 static const u8 TMP51X_CURR_INPUT[2] = { 158 TMP51X_SHUNT_CURRENT_RESULT, 159 TMP51X_BUS_CURRENT_RESULT 160 }; 161 162 static const struct regmap_config tmp51x_regmap_config = { 163 .reg_bits = 8, 164 .val_bits = 16, 165 .max_register = TMP51X_MAX_REGISTER_ADDR, 166 }; 167 168 struct tmp51x_data { 169 u16 shunt_config; 170 u16 pga_gain; 171 u32 vbus_range_uvolt; 172 173 u16 temp_config; 174 u32 nfactor[3]; 175 176 u32 shunt_uohms; 177 178 u32 curr_lsb_ua; 179 u32 pwr_lsb_uw; 180 181 u8 max_channels; 182 struct regmap *regmap; 183 }; 184 185 // Set the shift based on the gain: 8 -> 1, 4 -> 2, 2 -> 3, 1 -> 4 186 static inline u8 tmp51x_get_pga_shift(struct tmp51x_data *data) 187 { 188 return 5 - ffs(data->pga_gain); 189 } 190 191 static int tmp51x_get_value(struct tmp51x_data *data, u8 reg, u8 pos, 192 unsigned int regval, long *val) 193 { 194 switch (reg) { 195 case TMP51X_STATUS: 196 *val = (regval >> pos) & 1; 197 break; 198 case TMP51X_SHUNT_CURRENT_RESULT: 199 case TMP51X_SHUNT_CURRENT_H_LIMIT: 200 case TMP51X_SHUNT_CURRENT_L_LIMIT: 201 /* 202 * The valus is read in voltage in the chip but reported as 203 * current to the user. 204 * 2's complement number shifted by one to four depending 205 * on the pga gain setting. 1lsb = 10uV 206 */ 207 *val = sign_extend32(regval, 208 reg == TMP51X_SHUNT_CURRENT_RESULT ? 209 16 - tmp51x_get_pga_shift(data) : 15); 210 *val = DIV_ROUND_CLOSEST(*val * 10 * (long)MILLI, (long)data->shunt_uohms); 211 212 break; 213 case TMP51X_BUS_VOLTAGE_RESULT: 214 case TMP51X_BUS_VOLTAGE_H_LIMIT: 215 case TMP51X_BUS_VOLTAGE_L_LIMIT: 216 // 1lsb = 4mV 217 *val = (regval >> TMP51X_BUS_VOLTAGE_SHIFT) * 4; 218 break; 219 case TMP51X_POWER_RESULT: 220 case TMP51X_POWER_LIMIT: 221 // Power = (current * BusVoltage) / 5000 222 *val = regval * data->pwr_lsb_uw; 223 break; 224 case TMP51X_BUS_CURRENT_RESULT: 225 // Current = (ShuntVoltage * CalibrationRegister) / 4096 226 *val = sign_extend32(regval, 15) * (long)data->curr_lsb_ua; 227 *val = DIV_ROUND_CLOSEST(*val, (long)MILLI); 228 break; 229 case TMP51X_LOCAL_TEMP_RESULT: 230 case TMP51X_REMOTE_TEMP_RESULT_1: 231 case TMP51X_REMOTE_TEMP_RESULT_2: 232 case TMP513_REMOTE_TEMP_RESULT_3: 233 case TMP51X_LOCAL_TEMP_LIMIT: 234 case TMP51X_REMOTE_TEMP_LIMIT_1: 235 case TMP51X_REMOTE_TEMP_LIMIT_2: 236 case TMP513_REMOTE_TEMP_LIMIT_3: 237 // 1lsb = 0.0625 degrees centigrade 238 *val = sign_extend32(regval, 15) >> TMP51X_TEMP_SHIFT; 239 *val = DIV_ROUND_CLOSEST(*val * 625, 10); 240 break; 241 case TMP51X_N_FACTOR_AND_HYST_1: 242 // 1lsb = 0.5 degrees centigrade 243 *val = (regval & TMP51X_HYST_MASK) * 500; 244 break; 245 default: 246 // Programmer goofed 247 WARN_ON_ONCE(1); 248 *val = 0; 249 return -EOPNOTSUPP; 250 } 251 252 return 0; 253 } 254 255 static int tmp51x_set_value(struct tmp51x_data *data, u8 reg, long val) 256 { 257 int regval, max_val; 258 u32 mask = 0; 259 260 switch (reg) { 261 case TMP51X_SHUNT_CURRENT_H_LIMIT: 262 case TMP51X_SHUNT_CURRENT_L_LIMIT: 263 /* 264 * The user enter current value and we convert it to 265 * voltage. 1lsb = 10uV 266 */ 267 val = DIV_ROUND_CLOSEST(val * (long)data->shunt_uohms, 10 * (long)MILLI); 268 max_val = U16_MAX >> tmp51x_get_pga_shift(data); 269 regval = clamp_val(val, -max_val, max_val); 270 break; 271 case TMP51X_BUS_VOLTAGE_H_LIMIT: 272 case TMP51X_BUS_VOLTAGE_L_LIMIT: 273 // 1lsb = 4mV 274 max_val = (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) ? 275 MAX_BUS_VOLTAGE_32_LIMIT : MAX_BUS_VOLTAGE_16_LIMIT; 276 277 val = clamp_val(DIV_ROUND_CLOSEST(val, 4), 0, max_val); 278 regval = val << TMP51X_BUS_VOLTAGE_SHIFT; 279 break; 280 case TMP51X_POWER_LIMIT: 281 regval = clamp_val(DIV_ROUND_CLOSEST(val, data->pwr_lsb_uw), 0, 282 U16_MAX); 283 break; 284 case TMP51X_LOCAL_TEMP_LIMIT: 285 case TMP51X_REMOTE_TEMP_LIMIT_1: 286 case TMP51X_REMOTE_TEMP_LIMIT_2: 287 case TMP513_REMOTE_TEMP_LIMIT_3: 288 // 1lsb = 0.0625 degrees centigrade 289 val = clamp_val(val, MIN_TEMP_LIMIT, MAX_TEMP_LIMIT); 290 regval = DIV_ROUND_CLOSEST(val * 10, 625) << TMP51X_TEMP_SHIFT; 291 break; 292 case TMP51X_N_FACTOR_AND_HYST_1: 293 // 1lsb = 0.5 degrees centigrade 294 val = clamp_val(val, 0, MAX_TEMP_HYST); 295 regval = DIV_ROUND_CLOSEST(val, 500); 296 mask = TMP51X_HYST_MASK; 297 break; 298 default: 299 // Programmer goofed 300 WARN_ON_ONCE(1); 301 return -EOPNOTSUPP; 302 } 303 304 if (mask == 0) 305 return regmap_write(data->regmap, reg, regval); 306 else 307 return regmap_update_bits(data->regmap, reg, mask, regval); 308 } 309 310 static u8 tmp51x_get_reg(enum hwmon_sensor_types type, u32 attr, int channel) 311 { 312 switch (type) { 313 case hwmon_temp: 314 switch (attr) { 315 case hwmon_temp_input: 316 return TMP51X_TEMP_INPUT[channel]; 317 case hwmon_temp_crit_alarm: 318 return TMP51X_STATUS; 319 case hwmon_temp_crit: 320 return TMP51X_TEMP_CRIT[channel]; 321 case hwmon_temp_crit_hyst: 322 return TMP51X_TEMP_CRIT_HYST[channel]; 323 } 324 break; 325 case hwmon_in: 326 switch (attr) { 327 case hwmon_in_input: 328 return TMP51X_BUS_VOLTAGE_RESULT; 329 case hwmon_in_lcrit_alarm: 330 case hwmon_in_crit_alarm: 331 return TMP51X_STATUS; 332 case hwmon_in_lcrit: 333 return TMP51X_BUS_VOLTAGE_L_LIMIT; 334 case hwmon_in_crit: 335 return TMP51X_BUS_VOLTAGE_H_LIMIT; 336 } 337 break; 338 case hwmon_curr: 339 switch (attr) { 340 case hwmon_curr_input: 341 return TMP51X_CURR_INPUT[channel]; 342 case hwmon_curr_lcrit_alarm: 343 case hwmon_curr_crit_alarm: 344 return TMP51X_STATUS; 345 case hwmon_curr_lcrit: 346 return TMP51X_SHUNT_CURRENT_L_LIMIT; 347 case hwmon_curr_crit: 348 return TMP51X_SHUNT_CURRENT_H_LIMIT; 349 } 350 break; 351 case hwmon_power: 352 switch (attr) { 353 case hwmon_power_input: 354 return TMP51X_POWER_RESULT; 355 case hwmon_power_crit_alarm: 356 return TMP51X_STATUS; 357 case hwmon_power_crit: 358 return TMP51X_POWER_LIMIT; 359 } 360 break; 361 default: 362 break; 363 } 364 365 return 0; 366 } 367 368 static u8 tmp51x_get_status_pos(enum hwmon_sensor_types type, u32 attr, 369 int channel) 370 { 371 switch (type) { 372 case hwmon_temp: 373 switch (attr) { 374 case hwmon_temp_crit_alarm: 375 return TMP51X_TEMP_CRIT_ALARM[channel]; 376 } 377 break; 378 case hwmon_in: 379 switch (attr) { 380 case hwmon_in_lcrit_alarm: 381 return TMP51X_BUS_VOLTAGE_L_LIMIT_POS; 382 case hwmon_in_crit_alarm: 383 return TMP51X_BUS_VOLTAGE_H_LIMIT_POS; 384 } 385 break; 386 case hwmon_curr: 387 switch (attr) { 388 case hwmon_curr_lcrit_alarm: 389 return TMP51X_SHUNT_CURRENT_L_LIMIT_POS; 390 case hwmon_curr_crit_alarm: 391 return TMP51X_SHUNT_CURRENT_H_LIMIT_POS; 392 } 393 break; 394 case hwmon_power: 395 switch (attr) { 396 case hwmon_power_crit_alarm: 397 return TMP51X_POWER_LIMIT_POS; 398 } 399 break; 400 default: 401 break; 402 } 403 404 return 0; 405 } 406 407 static int tmp51x_read(struct device *dev, enum hwmon_sensor_types type, 408 u32 attr, int channel, long *val) 409 { 410 struct tmp51x_data *data = dev_get_drvdata(dev); 411 int ret; 412 u32 regval; 413 u8 pos = 0, reg = 0; 414 415 reg = tmp51x_get_reg(type, attr, channel); 416 if (reg == 0) 417 return -EOPNOTSUPP; 418 419 if (reg == TMP51X_STATUS) 420 pos = tmp51x_get_status_pos(type, attr, channel); 421 422 ret = regmap_read(data->regmap, reg, ®val); 423 if (ret < 0) 424 return ret; 425 426 return tmp51x_get_value(data, reg, pos, regval, val); 427 } 428 429 static int tmp51x_write(struct device *dev, enum hwmon_sensor_types type, 430 u32 attr, int channel, long val) 431 { 432 u8 reg = 0; 433 434 reg = tmp51x_get_reg(type, attr, channel); 435 if (reg == 0) 436 return -EOPNOTSUPP; 437 438 return tmp51x_set_value(dev_get_drvdata(dev), reg, val); 439 } 440 441 static umode_t tmp51x_is_visible(const void *_data, 442 enum hwmon_sensor_types type, u32 attr, 443 int channel) 444 { 445 const struct tmp51x_data *data = _data; 446 447 switch (type) { 448 case hwmon_temp: 449 if (channel >= data->max_channels) 450 return 0; 451 switch (attr) { 452 case hwmon_temp_input: 453 case hwmon_temp_crit_alarm: 454 return 0444; 455 case hwmon_temp_crit: 456 return 0644; 457 case hwmon_temp_crit_hyst: 458 if (channel == 0) 459 return 0644; 460 return 0444; 461 } 462 break; 463 case hwmon_in: 464 switch (attr) { 465 case hwmon_in_input: 466 case hwmon_in_lcrit_alarm: 467 case hwmon_in_crit_alarm: 468 return 0444; 469 case hwmon_in_lcrit: 470 case hwmon_in_crit: 471 return 0644; 472 } 473 break; 474 case hwmon_curr: 475 if (!data->shunt_uohms) 476 return 0; 477 478 switch (attr) { 479 case hwmon_curr_input: 480 case hwmon_curr_lcrit_alarm: 481 case hwmon_curr_crit_alarm: 482 return 0444; 483 case hwmon_curr_lcrit: 484 case hwmon_curr_crit: 485 return 0644; 486 } 487 break; 488 case hwmon_power: 489 if (!data->shunt_uohms) 490 return 0; 491 492 switch (attr) { 493 case hwmon_power_input: 494 case hwmon_power_crit_alarm: 495 return 0444; 496 case hwmon_power_crit: 497 return 0644; 498 } 499 break; 500 default: 501 break; 502 } 503 return 0; 504 } 505 506 static const struct hwmon_channel_info * const tmp51x_info[] = { 507 HWMON_CHANNEL_INFO(temp, 508 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | 509 HWMON_T_CRIT_HYST, 510 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | 511 HWMON_T_CRIT_HYST, 512 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | 513 HWMON_T_CRIT_HYST, 514 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | 515 HWMON_T_CRIT_HYST), 516 HWMON_CHANNEL_INFO(in, 517 HWMON_I_INPUT | HWMON_I_LCRIT | HWMON_I_LCRIT_ALARM | 518 HWMON_I_CRIT | HWMON_I_CRIT_ALARM), 519 HWMON_CHANNEL_INFO(curr, 520 HWMON_C_INPUT | HWMON_C_LCRIT | HWMON_C_LCRIT_ALARM | 521 HWMON_C_CRIT | HWMON_C_CRIT_ALARM, 522 HWMON_C_INPUT), 523 HWMON_CHANNEL_INFO(power, 524 HWMON_P_INPUT | HWMON_P_CRIT | HWMON_P_CRIT_ALARM), 525 NULL 526 }; 527 528 static const struct hwmon_ops tmp51x_hwmon_ops = { 529 .is_visible = tmp51x_is_visible, 530 .read = tmp51x_read, 531 .write = tmp51x_write, 532 }; 533 534 static const struct hwmon_chip_info tmp51x_chip_info = { 535 .ops = &tmp51x_hwmon_ops, 536 .info = tmp51x_info, 537 }; 538 539 /* 540 * Calibrate the tmp51x following the datasheet method 541 */ 542 static int tmp51x_calibrate(struct tmp51x_data *data) 543 { 544 int vshunt_max = data->pga_gain * 40; 545 u64 max_curr_ma; 546 u32 div; 547 548 /* 549 * If shunt_uohms is equal to 0, the calibration should be set to 0. 550 * The consequence will be that the current and power measurement engine 551 * of the sensor will not work. Temperature and voltage sensing will 552 * continue to work. 553 */ 554 if (data->shunt_uohms == 0) 555 return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 0); 556 557 max_curr_ma = DIV_ROUND_CLOSEST_ULL(vshunt_max * MICRO, data->shunt_uohms); 558 559 /* 560 * Calculate the minimal bit resolution for the current and the power. 561 * Those values will be used during register interpretation. 562 */ 563 data->curr_lsb_ua = DIV_ROUND_CLOSEST_ULL(max_curr_ma * MILLI, 32767); 564 data->pwr_lsb_uw = 20 * data->curr_lsb_ua; 565 566 div = DIV_ROUND_CLOSEST_ULL(data->curr_lsb_ua * data->shunt_uohms, MICRO); 567 568 return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 569 DIV_ROUND_CLOSEST(40960, div)); 570 } 571 572 /* 573 * Initialize the configuration and calibration registers. 574 */ 575 static int tmp51x_init(struct tmp51x_data *data) 576 { 577 unsigned int regval; 578 int ret = regmap_write(data->regmap, TMP51X_SHUNT_CONFIG, 579 data->shunt_config); 580 if (ret < 0) 581 return ret; 582 583 ret = regmap_write(data->regmap, TMP51X_TEMP_CONFIG, data->temp_config); 584 if (ret < 0) 585 return ret; 586 587 // nFactor configuration 588 ret = regmap_update_bits(data->regmap, TMP51X_N_FACTOR_AND_HYST_1, 589 TMP51X_NFACTOR_MASK, data->nfactor[0] << 8); 590 if (ret < 0) 591 return ret; 592 593 ret = regmap_write(data->regmap, TMP51X_N_FACTOR_2, 594 data->nfactor[1] << 8); 595 if (ret < 0) 596 return ret; 597 598 if (data->max_channels == TMP513_MAX_CHANNELS) { 599 ret = regmap_write(data->regmap, TMP513_N_FACTOR_3, 600 data->nfactor[2] << 8); 601 if (ret < 0) 602 return ret; 603 } 604 605 ret = tmp51x_calibrate(data); 606 if (ret < 0) 607 return ret; 608 609 // Read the status register before using as the datasheet propose 610 return regmap_read(data->regmap, TMP51X_STATUS, ®val); 611 } 612 613 static const struct i2c_device_id tmp51x_id[] = { 614 { "tmp512", TMP512_MAX_CHANNELS }, 615 { "tmp513", TMP513_MAX_CHANNELS }, 616 { } 617 }; 618 MODULE_DEVICE_TABLE(i2c, tmp51x_id); 619 620 static const struct of_device_id tmp51x_of_match[] = { 621 { .compatible = "ti,tmp512", .data = (void *)TMP512_MAX_CHANNELS }, 622 { .compatible = "ti,tmp513", .data = (void *)TMP513_MAX_CHANNELS }, 623 { } 624 }; 625 MODULE_DEVICE_TABLE(of, tmp51x_of_match); 626 627 static int tmp51x_vbus_range_to_reg(struct device *dev, 628 struct tmp51x_data *data) 629 { 630 if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) { 631 data->shunt_config |= TMP51X_BUS_VOLTAGE_MASK; 632 } else if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_16V) { 633 data->shunt_config &= ~TMP51X_BUS_VOLTAGE_MASK; 634 } else { 635 return dev_err_probe(dev, -EINVAL, 636 "ti,bus-range-microvolt is invalid: %u\n", 637 data->vbus_range_uvolt); 638 } 639 return 0; 640 } 641 642 static int tmp51x_pga_gain_to_reg(struct device *dev, struct tmp51x_data *data) 643 { 644 if (data->pga_gain == 8) { 645 data->shunt_config |= CURRENT_SENSE_VOLTAGE_320_MASK; 646 } else if (data->pga_gain == 4) { 647 data->shunt_config |= CURRENT_SENSE_VOLTAGE_160_MASK; 648 } else if (data->pga_gain == 2) { 649 data->shunt_config |= CURRENT_SENSE_VOLTAGE_80_MASK; 650 } else if (data->pga_gain == 1) { 651 data->shunt_config |= CURRENT_SENSE_VOLTAGE_40_MASK; 652 } else { 653 return dev_err_probe(dev, -EINVAL, 654 "ti,pga-gain is invalid: %u\n", data->pga_gain); 655 } 656 return 0; 657 } 658 659 static int tmp51x_read_properties(struct device *dev, struct tmp51x_data *data) 660 { 661 int ret; 662 u32 val; 663 664 ret = device_property_read_u32(dev, "shunt-resistor-micro-ohms", &val); 665 data->shunt_uohms = (ret >= 0) ? val : TMP51X_SHUNT_VALUE_DEFAULT; 666 667 ret = device_property_read_u32(dev, "ti,bus-range-microvolt", &val); 668 data->vbus_range_uvolt = (ret >= 0) ? val : TMP51X_VBUS_RANGE_DEFAULT; 669 ret = tmp51x_vbus_range_to_reg(dev, data); 670 if (ret < 0) 671 return ret; 672 673 ret = device_property_read_u32(dev, "ti,pga-gain", &val); 674 data->pga_gain = (ret >= 0) ? val : TMP51X_PGA_DEFAULT; 675 ret = tmp51x_pga_gain_to_reg(dev, data); 676 if (ret < 0) 677 return ret; 678 679 device_property_read_u32_array(dev, "ti,nfactor", data->nfactor, 680 data->max_channels - 1); 681 682 // Check if shunt value is compatible with pga-gain 683 if (data->shunt_uohms > data->pga_gain * 40 * MICRO) { 684 return dev_err_probe(dev, -EINVAL, 685 "shunt-resistor: %u too big for pga_gain: %u\n", 686 data->shunt_uohms, data->pga_gain); 687 } 688 689 return 0; 690 } 691 692 static void tmp51x_use_default(struct tmp51x_data *data) 693 { 694 data->vbus_range_uvolt = TMP51X_VBUS_RANGE_DEFAULT; 695 data->pga_gain = TMP51X_PGA_DEFAULT; 696 data->shunt_uohms = TMP51X_SHUNT_VALUE_DEFAULT; 697 } 698 699 static int tmp51x_configure(struct device *dev, struct tmp51x_data *data) 700 { 701 data->shunt_config = TMP51X_SHUNT_CONFIG_DEFAULT; 702 data->temp_config = TMP51X_TEMP_CONFIG_DEFAULT(data->max_channels); 703 704 if (dev->of_node) 705 return tmp51x_read_properties(dev, data); 706 707 tmp51x_use_default(data); 708 709 return 0; 710 } 711 712 static int tmp51x_probe(struct i2c_client *client) 713 { 714 struct device *dev = &client->dev; 715 struct tmp51x_data *data; 716 struct device *hwmon_dev; 717 int ret; 718 719 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 720 if (!data) 721 return -ENOMEM; 722 723 data->max_channels = (uintptr_t)i2c_get_match_data(client); 724 725 ret = tmp51x_configure(dev, data); 726 if (ret < 0) 727 return dev_err_probe(dev, ret, "error configuring the device\n"); 728 729 data->regmap = devm_regmap_init_i2c(client, &tmp51x_regmap_config); 730 if (IS_ERR(data->regmap)) 731 return dev_err_probe(dev, PTR_ERR(data->regmap), 732 "failed to allocate register map\n"); 733 734 ret = tmp51x_init(data); 735 if (ret < 0) 736 return dev_err_probe(dev, ret, "error configuring the device\n"); 737 738 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, 739 data, 740 &tmp51x_chip_info, 741 NULL); 742 if (IS_ERR(hwmon_dev)) 743 return PTR_ERR(hwmon_dev); 744 745 dev_dbg(dev, "power monitor %s\n", client->name); 746 747 return 0; 748 } 749 750 static struct i2c_driver tmp51x_driver = { 751 .driver = { 752 .name = "tmp51x", 753 .of_match_table = tmp51x_of_match, 754 }, 755 .probe = tmp51x_probe, 756 .id_table = tmp51x_id, 757 }; 758 759 module_i2c_driver(tmp51x_driver); 760 761 MODULE_AUTHOR("Eric Tremblay <etremblay@distechcontrols.com>"); 762 MODULE_DESCRIPTION("tmp51x driver"); 763 MODULE_LICENSE("GPL"); 764