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/err.h> 23 #include <linux/hwmon.h> 24 #include <linux/i2c.h> 25 #include <linux/init.h> 26 #include <linux/kernel.h> 27 #include <linux/module.h> 28 #include <linux/regmap.h> 29 #include <linux/slab.h> 30 #include <linux/util_macros.h> 31 32 // Common register definition 33 #define TMP51X_SHUNT_CONFIG 0x00 34 #define TMP51X_TEMP_CONFIG 0x01 35 #define TMP51X_STATUS 0x02 36 #define TMP51X_SMBUS_ALERT 0x03 37 #define TMP51X_SHUNT_CURRENT_RESULT 0x04 38 #define TMP51X_BUS_VOLTAGE_RESULT 0x05 39 #define TMP51X_POWER_RESULT 0x06 40 #define TMP51X_BUS_CURRENT_RESULT 0x07 41 #define TMP51X_LOCAL_TEMP_RESULT 0x08 42 #define TMP51X_REMOTE_TEMP_RESULT_1 0x09 43 #define TMP51X_REMOTE_TEMP_RESULT_2 0x0A 44 #define TMP51X_SHUNT_CURRENT_H_LIMIT 0x0C 45 #define TMP51X_SHUNT_CURRENT_L_LIMIT 0x0D 46 #define TMP51X_BUS_VOLTAGE_H_LIMIT 0x0E 47 #define TMP51X_BUS_VOLTAGE_L_LIMIT 0x0F 48 #define TMP51X_POWER_LIMIT 0x10 49 #define TMP51X_LOCAL_TEMP_LIMIT 0x11 50 #define TMP51X_REMOTE_TEMP_LIMIT_1 0x12 51 #define TMP51X_REMOTE_TEMP_LIMIT_2 0x13 52 #define TMP51X_SHUNT_CALIBRATION 0x15 53 #define TMP51X_N_FACTOR_AND_HYST_1 0x16 54 #define TMP51X_N_FACTOR_2 0x17 55 #define TMP51X_MAN_ID_REG 0xFE 56 #define TMP51X_DEVICE_ID_REG 0xFF 57 58 // TMP513 specific register definition 59 #define TMP513_REMOTE_TEMP_RESULT_3 0x0B 60 #define TMP513_REMOTE_TEMP_LIMIT_3 0x14 61 #define TMP513_N_FACTOR_3 0x18 62 63 // Common attrs, and NULL 64 #define TMP51X_MANUFACTURER_ID 0x55FF 65 66 #define TMP512_DEVICE_ID 0x22FF 67 #define TMP513_DEVICE_ID 0x23FF 68 69 // Default config 70 #define TMP51X_SHUNT_CONFIG_DEFAULT 0x399F 71 #define TMP51X_SHUNT_VALUE_DEFAULT 1000 72 #define TMP51X_VBUS_RANGE_DEFAULT TMP51X_VBUS_RANGE_32V 73 #define TMP51X_PGA_DEFAULT 8 74 #define TMP51X_MAX_REGISTER_ADDR 0xFF 75 76 #define TMP512_TEMP_CONFIG_DEFAULT 0xBF80 77 #define TMP513_TEMP_CONFIG_DEFAULT 0xFF80 78 79 // Mask and shift 80 #define CURRENT_SENSE_VOLTAGE_320_MASK 0x1800 81 #define CURRENT_SENSE_VOLTAGE_160_MASK 0x1000 82 #define CURRENT_SENSE_VOLTAGE_80_MASK 0x0800 83 #define CURRENT_SENSE_VOLTAGE_40_MASK 0 84 85 #define TMP51X_BUS_VOLTAGE_MASK 0x2000 86 #define TMP51X_NFACTOR_MASK 0xFF00 87 #define TMP51X_HYST_MASK 0x00FF 88 89 #define TMP51X_BUS_VOLTAGE_SHIFT 3 90 #define TMP51X_TEMP_SHIFT 3 91 92 // Alarms 93 #define TMP51X_SHUNT_CURRENT_H_LIMIT_POS 15 94 #define TMP51X_SHUNT_CURRENT_L_LIMIT_POS 14 95 #define TMP51X_BUS_VOLTAGE_H_LIMIT_POS 13 96 #define TMP51X_BUS_VOLTAGE_L_LIMIT_POS 12 97 #define TMP51X_POWER_LIMIT_POS 11 98 #define TMP51X_LOCAL_TEMP_LIMIT_POS 10 99 #define TMP51X_REMOTE_TEMP_LIMIT_1_POS 9 100 #define TMP51X_REMOTE_TEMP_LIMIT_2_POS 8 101 #define TMP513_REMOTE_TEMP_LIMIT_3_POS 7 102 103 #define TMP51X_VBUS_RANGE_32V 32000000 104 #define TMP51X_VBUS_RANGE_16V 16000000 105 106 // Max and Min value 107 #define MAX_BUS_VOLTAGE_32_LIMIT 32764 108 #define MAX_BUS_VOLTAGE_16_LIMIT 16382 109 110 // Max possible value is -256 to +256 but datasheet indicated -40 to 125. 111 #define MAX_TEMP_LIMIT 125000 112 #define MIN_TEMP_LIMIT -40000 113 114 #define MAX_TEMP_HYST 127500 115 116 static const u8 TMP51X_TEMP_INPUT[4] = { 117 TMP51X_LOCAL_TEMP_RESULT, 118 TMP51X_REMOTE_TEMP_RESULT_1, 119 TMP51X_REMOTE_TEMP_RESULT_2, 120 TMP513_REMOTE_TEMP_RESULT_3 121 }; 122 123 static const u8 TMP51X_TEMP_CRIT[4] = { 124 TMP51X_LOCAL_TEMP_LIMIT, 125 TMP51X_REMOTE_TEMP_LIMIT_1, 126 TMP51X_REMOTE_TEMP_LIMIT_2, 127 TMP513_REMOTE_TEMP_LIMIT_3 128 }; 129 130 static const u8 TMP51X_TEMP_CRIT_ALARM[4] = { 131 TMP51X_LOCAL_TEMP_LIMIT_POS, 132 TMP51X_REMOTE_TEMP_LIMIT_1_POS, 133 TMP51X_REMOTE_TEMP_LIMIT_2_POS, 134 TMP513_REMOTE_TEMP_LIMIT_3_POS 135 }; 136 137 static const u8 TMP51X_TEMP_CRIT_HYST[4] = { 138 TMP51X_N_FACTOR_AND_HYST_1, 139 TMP51X_N_FACTOR_AND_HYST_1, 140 TMP51X_N_FACTOR_AND_HYST_1, 141 TMP51X_N_FACTOR_AND_HYST_1 142 }; 143 144 static const u8 TMP51X_CURR_INPUT[2] = { 145 TMP51X_SHUNT_CURRENT_RESULT, 146 TMP51X_BUS_CURRENT_RESULT 147 }; 148 149 static struct regmap_config tmp51x_regmap_config = { 150 .reg_bits = 8, 151 .val_bits = 16, 152 .max_register = TMP51X_MAX_REGISTER_ADDR, 153 }; 154 155 enum tmp51x_ids { 156 tmp512, tmp513 157 }; 158 159 struct tmp51x_data { 160 u16 shunt_config; 161 u16 pga_gain; 162 u32 vbus_range_uvolt; 163 164 u16 temp_config; 165 u32 nfactor[3]; 166 167 u32 shunt_uohms; 168 169 u32 curr_lsb_ua; 170 u32 pwr_lsb_uw; 171 172 enum tmp51x_ids id; 173 struct regmap *regmap; 174 }; 175 176 // Set the shift based on the gain 8=4, 4=3, 2=2, 1=1 177 static inline u8 tmp51x_get_pga_shift(struct tmp51x_data *data) 178 { 179 return 5 - ffs(data->pga_gain); 180 } 181 182 static int tmp51x_get_value(struct tmp51x_data *data, u8 reg, u8 pos, 183 unsigned int regval, long *val) 184 { 185 switch (reg) { 186 case TMP51X_STATUS: 187 *val = (regval >> pos) & 1; 188 break; 189 case TMP51X_SHUNT_CURRENT_RESULT: 190 case TMP51X_SHUNT_CURRENT_H_LIMIT: 191 case TMP51X_SHUNT_CURRENT_L_LIMIT: 192 /* 193 * The valus is read in voltage in the chip but reported as 194 * current to the user. 195 * 2's complement number shifted by one to four depending 196 * on the pga gain setting. 1lsb = 10uV 197 */ 198 *val = sign_extend32(regval, 17 - tmp51x_get_pga_shift(data)); 199 *val = DIV_ROUND_CLOSEST(*val * 10000, data->shunt_uohms); 200 break; 201 case TMP51X_BUS_VOLTAGE_RESULT: 202 case TMP51X_BUS_VOLTAGE_H_LIMIT: 203 case TMP51X_BUS_VOLTAGE_L_LIMIT: 204 // 1lsb = 4mV 205 *val = (regval >> TMP51X_BUS_VOLTAGE_SHIFT) * 4; 206 break; 207 case TMP51X_POWER_RESULT: 208 case TMP51X_POWER_LIMIT: 209 // Power = (current * BusVoltage) / 5000 210 *val = regval * data->pwr_lsb_uw; 211 break; 212 case TMP51X_BUS_CURRENT_RESULT: 213 // Current = (ShuntVoltage * CalibrationRegister) / 4096 214 *val = sign_extend32(regval, 16) * data->curr_lsb_ua; 215 *val = DIV_ROUND_CLOSEST(*val, 1000); 216 break; 217 case TMP51X_LOCAL_TEMP_RESULT: 218 case TMP51X_REMOTE_TEMP_RESULT_1: 219 case TMP51X_REMOTE_TEMP_RESULT_2: 220 case TMP513_REMOTE_TEMP_RESULT_3: 221 case TMP51X_LOCAL_TEMP_LIMIT: 222 case TMP51X_REMOTE_TEMP_LIMIT_1: 223 case TMP51X_REMOTE_TEMP_LIMIT_2: 224 case TMP513_REMOTE_TEMP_LIMIT_3: 225 // 1lsb = 0.0625 degrees centigrade 226 *val = sign_extend32(regval, 16) >> TMP51X_TEMP_SHIFT; 227 *val = DIV_ROUND_CLOSEST(*val * 625, 10); 228 break; 229 case TMP51X_N_FACTOR_AND_HYST_1: 230 // 1lsb = 0.5 degrees centigrade 231 *val = (regval & TMP51X_HYST_MASK) * 500; 232 break; 233 default: 234 // Programmer goofed 235 WARN_ON_ONCE(1); 236 *val = 0; 237 return -EOPNOTSUPP; 238 } 239 240 return 0; 241 } 242 243 static int tmp51x_set_value(struct tmp51x_data *data, u8 reg, long val) 244 { 245 int regval, max_val; 246 u32 mask = 0; 247 248 switch (reg) { 249 case TMP51X_SHUNT_CURRENT_H_LIMIT: 250 case TMP51X_SHUNT_CURRENT_L_LIMIT: 251 /* 252 * The user enter current value and we convert it to 253 * voltage. 1lsb = 10uV 254 */ 255 val = DIV_ROUND_CLOSEST(val * data->shunt_uohms, 10000); 256 max_val = U16_MAX >> tmp51x_get_pga_shift(data); 257 regval = clamp_val(val, -max_val, max_val); 258 break; 259 case TMP51X_BUS_VOLTAGE_H_LIMIT: 260 case TMP51X_BUS_VOLTAGE_L_LIMIT: 261 // 1lsb = 4mV 262 max_val = (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) ? 263 MAX_BUS_VOLTAGE_32_LIMIT : MAX_BUS_VOLTAGE_16_LIMIT; 264 265 val = clamp_val(DIV_ROUND_CLOSEST(val, 4), 0, max_val); 266 regval = val << TMP51X_BUS_VOLTAGE_SHIFT; 267 break; 268 case TMP51X_POWER_LIMIT: 269 regval = clamp_val(DIV_ROUND_CLOSEST(val, data->pwr_lsb_uw), 0, 270 U16_MAX); 271 break; 272 case TMP51X_LOCAL_TEMP_LIMIT: 273 case TMP51X_REMOTE_TEMP_LIMIT_1: 274 case TMP51X_REMOTE_TEMP_LIMIT_2: 275 case TMP513_REMOTE_TEMP_LIMIT_3: 276 // 1lsb = 0.0625 degrees centigrade 277 val = clamp_val(val, MIN_TEMP_LIMIT, MAX_TEMP_LIMIT); 278 regval = DIV_ROUND_CLOSEST(val * 10, 625) << TMP51X_TEMP_SHIFT; 279 break; 280 case TMP51X_N_FACTOR_AND_HYST_1: 281 // 1lsb = 0.5 degrees centigrade 282 val = clamp_val(val, 0, MAX_TEMP_HYST); 283 regval = DIV_ROUND_CLOSEST(val, 500); 284 mask = TMP51X_HYST_MASK; 285 break; 286 default: 287 // Programmer goofed 288 WARN_ON_ONCE(1); 289 return -EOPNOTSUPP; 290 } 291 292 if (mask == 0) 293 return regmap_write(data->regmap, reg, regval); 294 else 295 return regmap_update_bits(data->regmap, reg, mask, regval); 296 } 297 298 static u8 tmp51x_get_reg(enum hwmon_sensor_types type, u32 attr, int channel) 299 { 300 switch (type) { 301 case hwmon_temp: 302 switch (attr) { 303 case hwmon_temp_input: 304 return TMP51X_TEMP_INPUT[channel]; 305 case hwmon_temp_crit_alarm: 306 return TMP51X_STATUS; 307 case hwmon_temp_crit: 308 return TMP51X_TEMP_CRIT[channel]; 309 case hwmon_temp_crit_hyst: 310 return TMP51X_TEMP_CRIT_HYST[channel]; 311 } 312 break; 313 case hwmon_in: 314 switch (attr) { 315 case hwmon_in_input: 316 return TMP51X_BUS_VOLTAGE_RESULT; 317 case hwmon_in_lcrit_alarm: 318 case hwmon_in_crit_alarm: 319 return TMP51X_STATUS; 320 case hwmon_in_lcrit: 321 return TMP51X_BUS_VOLTAGE_L_LIMIT; 322 case hwmon_in_crit: 323 return TMP51X_BUS_VOLTAGE_H_LIMIT; 324 } 325 break; 326 case hwmon_curr: 327 switch (attr) { 328 case hwmon_curr_input: 329 return TMP51X_CURR_INPUT[channel]; 330 case hwmon_curr_lcrit_alarm: 331 case hwmon_curr_crit_alarm: 332 return TMP51X_STATUS; 333 case hwmon_curr_lcrit: 334 return TMP51X_SHUNT_CURRENT_L_LIMIT; 335 case hwmon_curr_crit: 336 return TMP51X_SHUNT_CURRENT_H_LIMIT; 337 } 338 break; 339 case hwmon_power: 340 switch (attr) { 341 case hwmon_power_input: 342 return TMP51X_POWER_RESULT; 343 case hwmon_power_crit_alarm: 344 return TMP51X_STATUS; 345 case hwmon_power_crit: 346 return TMP51X_POWER_LIMIT; 347 } 348 break; 349 default: 350 break; 351 } 352 353 return 0; 354 } 355 356 static u8 tmp51x_get_status_pos(enum hwmon_sensor_types type, u32 attr, 357 int channel) 358 { 359 switch (type) { 360 case hwmon_temp: 361 switch (attr) { 362 case hwmon_temp_crit_alarm: 363 return TMP51X_TEMP_CRIT_ALARM[channel]; 364 } 365 break; 366 case hwmon_in: 367 switch (attr) { 368 case hwmon_in_lcrit_alarm: 369 return TMP51X_BUS_VOLTAGE_L_LIMIT_POS; 370 case hwmon_in_crit_alarm: 371 return TMP51X_BUS_VOLTAGE_H_LIMIT_POS; 372 } 373 break; 374 case hwmon_curr: 375 switch (attr) { 376 case hwmon_curr_lcrit_alarm: 377 return TMP51X_SHUNT_CURRENT_L_LIMIT_POS; 378 case hwmon_curr_crit_alarm: 379 return TMP51X_SHUNT_CURRENT_H_LIMIT_POS; 380 } 381 break; 382 case hwmon_power: 383 switch (attr) { 384 case hwmon_power_crit_alarm: 385 return TMP51X_POWER_LIMIT_POS; 386 } 387 break; 388 default: 389 break; 390 } 391 392 return 0; 393 } 394 395 static int tmp51x_read(struct device *dev, enum hwmon_sensor_types type, 396 u32 attr, int channel, long *val) 397 { 398 struct tmp51x_data *data = dev_get_drvdata(dev); 399 int ret; 400 u32 regval; 401 u8 pos = 0, reg = 0; 402 403 reg = tmp51x_get_reg(type, attr, channel); 404 if (reg == 0) 405 return -EOPNOTSUPP; 406 407 if (reg == TMP51X_STATUS) 408 pos = tmp51x_get_status_pos(type, attr, channel); 409 410 ret = regmap_read(data->regmap, reg, ®val); 411 if (ret < 0) 412 return ret; 413 414 return tmp51x_get_value(data, reg, pos, regval, val); 415 } 416 417 static int tmp51x_write(struct device *dev, enum hwmon_sensor_types type, 418 u32 attr, int channel, long val) 419 { 420 u8 reg = 0; 421 422 reg = tmp51x_get_reg(type, attr, channel); 423 if (reg == 0) 424 return -EOPNOTSUPP; 425 426 return tmp51x_set_value(dev_get_drvdata(dev), reg, val); 427 } 428 429 static umode_t tmp51x_is_visible(const void *_data, 430 enum hwmon_sensor_types type, u32 attr, 431 int channel) 432 { 433 const struct tmp51x_data *data = _data; 434 435 switch (type) { 436 case hwmon_temp: 437 if (data->id == tmp512 && channel == 3) 438 return 0; 439 switch (attr) { 440 case hwmon_temp_input: 441 case hwmon_temp_crit_alarm: 442 return 0444; 443 case hwmon_temp_crit: 444 return 0644; 445 case hwmon_temp_crit_hyst: 446 if (channel == 0) 447 return 0644; 448 return 0444; 449 } 450 break; 451 case hwmon_in: 452 switch (attr) { 453 case hwmon_in_input: 454 case hwmon_in_lcrit_alarm: 455 case hwmon_in_crit_alarm: 456 return 0444; 457 case hwmon_in_lcrit: 458 case hwmon_in_crit: 459 return 0644; 460 } 461 break; 462 case hwmon_curr: 463 if (!data->shunt_uohms) 464 return 0; 465 466 switch (attr) { 467 case hwmon_curr_input: 468 case hwmon_curr_lcrit_alarm: 469 case hwmon_curr_crit_alarm: 470 return 0444; 471 case hwmon_curr_lcrit: 472 case hwmon_curr_crit: 473 return 0644; 474 } 475 break; 476 case hwmon_power: 477 if (!data->shunt_uohms) 478 return 0; 479 480 switch (attr) { 481 case hwmon_power_input: 482 case hwmon_power_crit_alarm: 483 return 0444; 484 case hwmon_power_crit: 485 return 0644; 486 } 487 break; 488 default: 489 break; 490 } 491 return 0; 492 } 493 494 static const struct hwmon_channel_info * const tmp51x_info[] = { 495 HWMON_CHANNEL_INFO(temp, 496 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | 497 HWMON_T_CRIT_HYST, 498 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | 499 HWMON_T_CRIT_HYST, 500 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | 501 HWMON_T_CRIT_HYST, 502 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | 503 HWMON_T_CRIT_HYST), 504 HWMON_CHANNEL_INFO(in, 505 HWMON_I_INPUT | HWMON_I_LCRIT | HWMON_I_LCRIT_ALARM | 506 HWMON_I_CRIT | HWMON_I_CRIT_ALARM), 507 HWMON_CHANNEL_INFO(curr, 508 HWMON_C_INPUT | HWMON_C_LCRIT | HWMON_C_LCRIT_ALARM | 509 HWMON_C_CRIT | HWMON_C_CRIT_ALARM, 510 HWMON_C_INPUT), 511 HWMON_CHANNEL_INFO(power, 512 HWMON_P_INPUT | HWMON_P_CRIT | HWMON_P_CRIT_ALARM), 513 NULL 514 }; 515 516 static const struct hwmon_ops tmp51x_hwmon_ops = { 517 .is_visible = tmp51x_is_visible, 518 .read = tmp51x_read, 519 .write = tmp51x_write, 520 }; 521 522 static const struct hwmon_chip_info tmp51x_chip_info = { 523 .ops = &tmp51x_hwmon_ops, 524 .info = tmp51x_info, 525 }; 526 527 /* 528 * Calibrate the tmp51x following the datasheet method 529 */ 530 static int tmp51x_calibrate(struct tmp51x_data *data) 531 { 532 int vshunt_max = data->pga_gain * 40; 533 u64 max_curr_ma; 534 u32 div; 535 536 /* 537 * If shunt_uohms is equal to 0, the calibration should be set to 0. 538 * The consequence will be that the current and power measurement engine 539 * of the sensor will not work. Temperature and voltage sensing will 540 * continue to work. 541 */ 542 if (data->shunt_uohms == 0) 543 return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 0); 544 545 max_curr_ma = DIV_ROUND_CLOSEST_ULL(vshunt_max * 1000 * 1000, 546 data->shunt_uohms); 547 548 /* 549 * Calculate the minimal bit resolution for the current and the power. 550 * Those values will be used during register interpretation. 551 */ 552 data->curr_lsb_ua = DIV_ROUND_CLOSEST_ULL(max_curr_ma * 1000, 32767); 553 data->pwr_lsb_uw = 20 * data->curr_lsb_ua; 554 555 div = DIV_ROUND_CLOSEST_ULL(data->curr_lsb_ua * data->shunt_uohms, 556 1000 * 1000); 557 558 return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 559 DIV_ROUND_CLOSEST(40960, div)); 560 } 561 562 /* 563 * Initialize the configuration and calibration registers. 564 */ 565 static int tmp51x_init(struct tmp51x_data *data) 566 { 567 unsigned int regval; 568 int ret = regmap_write(data->regmap, TMP51X_SHUNT_CONFIG, 569 data->shunt_config); 570 if (ret < 0) 571 return ret; 572 573 ret = regmap_write(data->regmap, TMP51X_TEMP_CONFIG, data->temp_config); 574 if (ret < 0) 575 return ret; 576 577 // nFactor configuration 578 ret = regmap_update_bits(data->regmap, TMP51X_N_FACTOR_AND_HYST_1, 579 TMP51X_NFACTOR_MASK, data->nfactor[0] << 8); 580 if (ret < 0) 581 return ret; 582 583 ret = regmap_write(data->regmap, TMP51X_N_FACTOR_2, 584 data->nfactor[1] << 8); 585 if (ret < 0) 586 return ret; 587 588 if (data->id == tmp513) { 589 ret = regmap_write(data->regmap, TMP513_N_FACTOR_3, 590 data->nfactor[2] << 8); 591 if (ret < 0) 592 return ret; 593 } 594 595 ret = tmp51x_calibrate(data); 596 if (ret < 0) 597 return ret; 598 599 // Read the status register before using as the datasheet propose 600 return regmap_read(data->regmap, TMP51X_STATUS, ®val); 601 } 602 603 static const struct i2c_device_id tmp51x_id[] = { 604 { "tmp512", tmp512 }, 605 { "tmp513", tmp513 }, 606 { } 607 }; 608 MODULE_DEVICE_TABLE(i2c, tmp51x_id); 609 610 static const struct of_device_id tmp51x_of_match[] = { 611 { 612 .compatible = "ti,tmp512", 613 .data = (void *)tmp512 614 }, 615 { 616 .compatible = "ti,tmp513", 617 .data = (void *)tmp513 618 }, 619 { }, 620 }; 621 MODULE_DEVICE_TABLE(of, tmp51x_of_match); 622 623 static int tmp51x_vbus_range_to_reg(struct device *dev, 624 struct tmp51x_data *data) 625 { 626 if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) { 627 data->shunt_config |= TMP51X_BUS_VOLTAGE_MASK; 628 } else if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_16V) { 629 data->shunt_config &= ~TMP51X_BUS_VOLTAGE_MASK; 630 } else { 631 dev_err(dev, "ti,bus-range-microvolt is invalid: %u\n", 632 data->vbus_range_uvolt); 633 return -EINVAL; 634 } 635 return 0; 636 } 637 638 static int tmp51x_pga_gain_to_reg(struct device *dev, struct tmp51x_data *data) 639 { 640 if (data->pga_gain == 8) { 641 data->shunt_config |= CURRENT_SENSE_VOLTAGE_320_MASK; 642 } else if (data->pga_gain == 4) { 643 data->shunt_config |= CURRENT_SENSE_VOLTAGE_160_MASK; 644 } else if (data->pga_gain == 2) { 645 data->shunt_config |= CURRENT_SENSE_VOLTAGE_80_MASK; 646 } else if (data->pga_gain == 1) { 647 data->shunt_config |= CURRENT_SENSE_VOLTAGE_40_MASK; 648 } else { 649 dev_err(dev, "ti,pga-gain is invalid: %u\n", data->pga_gain); 650 return -EINVAL; 651 } 652 return 0; 653 } 654 655 static int tmp51x_read_properties(struct device *dev, struct tmp51x_data *data) 656 { 657 int ret; 658 u32 nfactor[3]; 659 u32 val; 660 661 ret = device_property_read_u32(dev, "shunt-resistor-micro-ohms", &val); 662 data->shunt_uohms = (ret >= 0) ? val : TMP51X_SHUNT_VALUE_DEFAULT; 663 664 ret = device_property_read_u32(dev, "ti,bus-range-microvolt", &val); 665 data->vbus_range_uvolt = (ret >= 0) ? val : TMP51X_VBUS_RANGE_DEFAULT; 666 ret = tmp51x_vbus_range_to_reg(dev, data); 667 if (ret < 0) 668 return ret; 669 670 ret = device_property_read_u32(dev, "ti,pga-gain", &val); 671 data->pga_gain = (ret >= 0) ? val : TMP51X_PGA_DEFAULT; 672 ret = tmp51x_pga_gain_to_reg(dev, data); 673 if (ret < 0) 674 return ret; 675 676 ret = device_property_read_u32_array(dev, "ti,nfactor", nfactor, 677 (data->id == tmp513) ? 3 : 2); 678 if (ret >= 0) 679 memcpy(data->nfactor, nfactor, (data->id == tmp513) ? 3 : 2); 680 681 // Check if shunt value is compatible with pga-gain 682 if (data->shunt_uohms > data->pga_gain * 40 * 1000 * 1000) { 683 dev_err(dev, "shunt-resistor: %u too big for pga_gain: %u\n", 684 data->shunt_uohms, data->pga_gain); 685 return -EINVAL; 686 } 687 688 return 0; 689 } 690 691 static void tmp51x_use_default(struct tmp51x_data *data) 692 { 693 data->vbus_range_uvolt = TMP51X_VBUS_RANGE_DEFAULT; 694 data->pga_gain = TMP51X_PGA_DEFAULT; 695 data->shunt_uohms = TMP51X_SHUNT_VALUE_DEFAULT; 696 } 697 698 static int tmp51x_configure(struct device *dev, struct tmp51x_data *data) 699 { 700 data->shunt_config = TMP51X_SHUNT_CONFIG_DEFAULT; 701 data->temp_config = (data->id == tmp513) ? 702 TMP513_TEMP_CONFIG_DEFAULT : TMP512_TEMP_CONFIG_DEFAULT; 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->id = (uintptr_t)i2c_get_match_data(client); 724 725 ret = tmp51x_configure(dev, data); 726 if (ret < 0) { 727 dev_err(dev, "error configuring the device: %d\n", ret); 728 return ret; 729 } 730 731 data->regmap = devm_regmap_init_i2c(client, &tmp51x_regmap_config); 732 if (IS_ERR(data->regmap)) { 733 dev_err(dev, "failed to allocate register map\n"); 734 return PTR_ERR(data->regmap); 735 } 736 737 ret = tmp51x_init(data); 738 if (ret < 0) { 739 dev_err(dev, "error configuring the device: %d\n", ret); 740 return -ENODEV; 741 } 742 743 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, 744 data, 745 &tmp51x_chip_info, 746 NULL); 747 if (IS_ERR(hwmon_dev)) 748 return PTR_ERR(hwmon_dev); 749 750 dev_dbg(dev, "power monitor %s\n", client->name); 751 752 return 0; 753 } 754 755 static struct i2c_driver tmp51x_driver = { 756 .driver = { 757 .name = "tmp51x", 758 .of_match_table = tmp51x_of_match, 759 }, 760 .probe = tmp51x_probe, 761 .id_table = tmp51x_id, 762 }; 763 764 module_i2c_driver(tmp51x_driver); 765 766 MODULE_AUTHOR("Eric Tremblay <etremblay@distechcontrols.com>"); 767 MODULE_DESCRIPTION("tmp51x driver"); 768 MODULE_LICENSE("GPL"); 769