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 #define TMP512_TEMP_CONFIG_DEFAULT 0xBF80 82 #define TMP513_TEMP_CONFIG_DEFAULT 0xFF80 83 84 // Mask and shift 85 #define CURRENT_SENSE_VOLTAGE_320_MASK 0x1800 86 #define CURRENT_SENSE_VOLTAGE_160_MASK 0x1000 87 #define CURRENT_SENSE_VOLTAGE_80_MASK 0x0800 88 #define CURRENT_SENSE_VOLTAGE_40_MASK 0 89 90 #define TMP51X_BUS_VOLTAGE_MASK 0x2000 91 #define TMP51X_NFACTOR_MASK 0xFF00 92 #define TMP51X_HYST_MASK 0x00FF 93 94 #define TMP51X_BUS_VOLTAGE_SHIFT 3 95 #define TMP51X_TEMP_SHIFT 3 96 97 // Alarms 98 #define TMP51X_SHUNT_CURRENT_H_LIMIT_POS 15 99 #define TMP51X_SHUNT_CURRENT_L_LIMIT_POS 14 100 #define TMP51X_BUS_VOLTAGE_H_LIMIT_POS 13 101 #define TMP51X_BUS_VOLTAGE_L_LIMIT_POS 12 102 #define TMP51X_POWER_LIMIT_POS 11 103 #define TMP51X_LOCAL_TEMP_LIMIT_POS 10 104 #define TMP51X_REMOTE_TEMP_LIMIT_1_POS 9 105 #define TMP51X_REMOTE_TEMP_LIMIT_2_POS 8 106 #define TMP513_REMOTE_TEMP_LIMIT_3_POS 7 107 108 #define TMP51X_VBUS_RANGE_32V (32 * MICRO) 109 #define TMP51X_VBUS_RANGE_16V (16 * MICRO) 110 111 // Max and Min value 112 #define MAX_BUS_VOLTAGE_32_LIMIT 32764 113 #define MAX_BUS_VOLTAGE_16_LIMIT 16382 114 115 // Max possible value is -256 to +256 but datasheet indicated -40 to 125. 116 #define MAX_TEMP_LIMIT 125000 117 #define MIN_TEMP_LIMIT -40000 118 119 #define MAX_TEMP_HYST 127500 120 121 static const u8 TMP51X_TEMP_INPUT[4] = { 122 TMP51X_LOCAL_TEMP_RESULT, 123 TMP51X_REMOTE_TEMP_RESULT_1, 124 TMP51X_REMOTE_TEMP_RESULT_2, 125 TMP513_REMOTE_TEMP_RESULT_3 126 }; 127 128 static const u8 TMP51X_TEMP_CRIT[4] = { 129 TMP51X_LOCAL_TEMP_LIMIT, 130 TMP51X_REMOTE_TEMP_LIMIT_1, 131 TMP51X_REMOTE_TEMP_LIMIT_2, 132 TMP513_REMOTE_TEMP_LIMIT_3 133 }; 134 135 static const u8 TMP51X_TEMP_CRIT_ALARM[4] = { 136 TMP51X_LOCAL_TEMP_LIMIT_POS, 137 TMP51X_REMOTE_TEMP_LIMIT_1_POS, 138 TMP51X_REMOTE_TEMP_LIMIT_2_POS, 139 TMP513_REMOTE_TEMP_LIMIT_3_POS 140 }; 141 142 static const u8 TMP51X_TEMP_CRIT_HYST[4] = { 143 TMP51X_N_FACTOR_AND_HYST_1, 144 TMP51X_N_FACTOR_AND_HYST_1, 145 TMP51X_N_FACTOR_AND_HYST_1, 146 TMP51X_N_FACTOR_AND_HYST_1 147 }; 148 149 static const u8 TMP51X_CURR_INPUT[2] = { 150 TMP51X_SHUNT_CURRENT_RESULT, 151 TMP51X_BUS_CURRENT_RESULT 152 }; 153 154 static struct regmap_config tmp51x_regmap_config = { 155 .reg_bits = 8, 156 .val_bits = 16, 157 .max_register = TMP51X_MAX_REGISTER_ADDR, 158 }; 159 160 enum tmp51x_ids { 161 tmp512, tmp513 162 }; 163 164 struct tmp51x_data { 165 u16 shunt_config; 166 u16 pga_gain; 167 u32 vbus_range_uvolt; 168 169 u16 temp_config; 170 u32 nfactor[3]; 171 172 u32 shunt_uohms; 173 174 u32 curr_lsb_ua; 175 u32 pwr_lsb_uw; 176 177 enum tmp51x_ids id; 178 struct regmap *regmap; 179 }; 180 181 // Set the shift based on the gain: 8 -> 1, 4 -> 2, 2 -> 3, 1 -> 4 182 static inline u8 tmp51x_get_pga_shift(struct tmp51x_data *data) 183 { 184 return 5 - ffs(data->pga_gain); 185 } 186 187 static int tmp51x_get_value(struct tmp51x_data *data, u8 reg, u8 pos, 188 unsigned int regval, long *val) 189 { 190 switch (reg) { 191 case TMP51X_STATUS: 192 *val = (regval >> pos) & 1; 193 break; 194 case TMP51X_SHUNT_CURRENT_RESULT: 195 case TMP51X_SHUNT_CURRENT_H_LIMIT: 196 case TMP51X_SHUNT_CURRENT_L_LIMIT: 197 /* 198 * The valus is read in voltage in the chip but reported as 199 * current to the user. 200 * 2's complement number shifted by one to four depending 201 * on the pga gain setting. 1lsb = 10uV 202 */ 203 *val = sign_extend32(regval, 204 reg == TMP51X_SHUNT_CURRENT_RESULT ? 205 16 - tmp51x_get_pga_shift(data) : 15); 206 *val = DIV_ROUND_CLOSEST(*val * 10 * (long)MILLI, (long)data->shunt_uohms); 207 208 break; 209 case TMP51X_BUS_VOLTAGE_RESULT: 210 case TMP51X_BUS_VOLTAGE_H_LIMIT: 211 case TMP51X_BUS_VOLTAGE_L_LIMIT: 212 // 1lsb = 4mV 213 *val = (regval >> TMP51X_BUS_VOLTAGE_SHIFT) * 4; 214 break; 215 case TMP51X_POWER_RESULT: 216 case TMP51X_POWER_LIMIT: 217 // Power = (current * BusVoltage) / 5000 218 *val = regval * data->pwr_lsb_uw; 219 break; 220 case TMP51X_BUS_CURRENT_RESULT: 221 // Current = (ShuntVoltage * CalibrationRegister) / 4096 222 *val = sign_extend32(regval, 15) * (long)data->curr_lsb_ua; 223 *val = DIV_ROUND_CLOSEST(*val, (long)MILLI); 224 break; 225 case TMP51X_LOCAL_TEMP_RESULT: 226 case TMP51X_REMOTE_TEMP_RESULT_1: 227 case TMP51X_REMOTE_TEMP_RESULT_2: 228 case TMP513_REMOTE_TEMP_RESULT_3: 229 case TMP51X_LOCAL_TEMP_LIMIT: 230 case TMP51X_REMOTE_TEMP_LIMIT_1: 231 case TMP51X_REMOTE_TEMP_LIMIT_2: 232 case TMP513_REMOTE_TEMP_LIMIT_3: 233 // 1lsb = 0.0625 degrees centigrade 234 *val = sign_extend32(regval, 15) >> TMP51X_TEMP_SHIFT; 235 *val = DIV_ROUND_CLOSEST(*val * 625, 10); 236 break; 237 case TMP51X_N_FACTOR_AND_HYST_1: 238 // 1lsb = 0.5 degrees centigrade 239 *val = (regval & TMP51X_HYST_MASK) * 500; 240 break; 241 default: 242 // Programmer goofed 243 WARN_ON_ONCE(1); 244 *val = 0; 245 return -EOPNOTSUPP; 246 } 247 248 return 0; 249 } 250 251 static int tmp51x_set_value(struct tmp51x_data *data, u8 reg, long val) 252 { 253 int regval, max_val; 254 u32 mask = 0; 255 256 switch (reg) { 257 case TMP51X_SHUNT_CURRENT_H_LIMIT: 258 case TMP51X_SHUNT_CURRENT_L_LIMIT: 259 /* 260 * The user enter current value and we convert it to 261 * voltage. 1lsb = 10uV 262 */ 263 val = DIV_ROUND_CLOSEST(val * (long)data->shunt_uohms, 10 * (long)MILLI); 264 max_val = U16_MAX >> tmp51x_get_pga_shift(data); 265 regval = clamp_val(val, -max_val, max_val); 266 break; 267 case TMP51X_BUS_VOLTAGE_H_LIMIT: 268 case TMP51X_BUS_VOLTAGE_L_LIMIT: 269 // 1lsb = 4mV 270 max_val = (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) ? 271 MAX_BUS_VOLTAGE_32_LIMIT : MAX_BUS_VOLTAGE_16_LIMIT; 272 273 val = clamp_val(DIV_ROUND_CLOSEST(val, 4), 0, max_val); 274 regval = val << TMP51X_BUS_VOLTAGE_SHIFT; 275 break; 276 case TMP51X_POWER_LIMIT: 277 regval = clamp_val(DIV_ROUND_CLOSEST(val, data->pwr_lsb_uw), 0, 278 U16_MAX); 279 break; 280 case TMP51X_LOCAL_TEMP_LIMIT: 281 case TMP51X_REMOTE_TEMP_LIMIT_1: 282 case TMP51X_REMOTE_TEMP_LIMIT_2: 283 case TMP513_REMOTE_TEMP_LIMIT_3: 284 // 1lsb = 0.0625 degrees centigrade 285 val = clamp_val(val, MIN_TEMP_LIMIT, MAX_TEMP_LIMIT); 286 regval = DIV_ROUND_CLOSEST(val * 10, 625) << TMP51X_TEMP_SHIFT; 287 break; 288 case TMP51X_N_FACTOR_AND_HYST_1: 289 // 1lsb = 0.5 degrees centigrade 290 val = clamp_val(val, 0, MAX_TEMP_HYST); 291 regval = DIV_ROUND_CLOSEST(val, 500); 292 mask = TMP51X_HYST_MASK; 293 break; 294 default: 295 // Programmer goofed 296 WARN_ON_ONCE(1); 297 return -EOPNOTSUPP; 298 } 299 300 if (mask == 0) 301 return regmap_write(data->regmap, reg, regval); 302 else 303 return regmap_update_bits(data->regmap, reg, mask, regval); 304 } 305 306 static u8 tmp51x_get_reg(enum hwmon_sensor_types type, u32 attr, int channel) 307 { 308 switch (type) { 309 case hwmon_temp: 310 switch (attr) { 311 case hwmon_temp_input: 312 return TMP51X_TEMP_INPUT[channel]; 313 case hwmon_temp_crit_alarm: 314 return TMP51X_STATUS; 315 case hwmon_temp_crit: 316 return TMP51X_TEMP_CRIT[channel]; 317 case hwmon_temp_crit_hyst: 318 return TMP51X_TEMP_CRIT_HYST[channel]; 319 } 320 break; 321 case hwmon_in: 322 switch (attr) { 323 case hwmon_in_input: 324 return TMP51X_BUS_VOLTAGE_RESULT; 325 case hwmon_in_lcrit_alarm: 326 case hwmon_in_crit_alarm: 327 return TMP51X_STATUS; 328 case hwmon_in_lcrit: 329 return TMP51X_BUS_VOLTAGE_L_LIMIT; 330 case hwmon_in_crit: 331 return TMP51X_BUS_VOLTAGE_H_LIMIT; 332 } 333 break; 334 case hwmon_curr: 335 switch (attr) { 336 case hwmon_curr_input: 337 return TMP51X_CURR_INPUT[channel]; 338 case hwmon_curr_lcrit_alarm: 339 case hwmon_curr_crit_alarm: 340 return TMP51X_STATUS; 341 case hwmon_curr_lcrit: 342 return TMP51X_SHUNT_CURRENT_L_LIMIT; 343 case hwmon_curr_crit: 344 return TMP51X_SHUNT_CURRENT_H_LIMIT; 345 } 346 break; 347 case hwmon_power: 348 switch (attr) { 349 case hwmon_power_input: 350 return TMP51X_POWER_RESULT; 351 case hwmon_power_crit_alarm: 352 return TMP51X_STATUS; 353 case hwmon_power_crit: 354 return TMP51X_POWER_LIMIT; 355 } 356 break; 357 default: 358 break; 359 } 360 361 return 0; 362 } 363 364 static u8 tmp51x_get_status_pos(enum hwmon_sensor_types type, u32 attr, 365 int channel) 366 { 367 switch (type) { 368 case hwmon_temp: 369 switch (attr) { 370 case hwmon_temp_crit_alarm: 371 return TMP51X_TEMP_CRIT_ALARM[channel]; 372 } 373 break; 374 case hwmon_in: 375 switch (attr) { 376 case hwmon_in_lcrit_alarm: 377 return TMP51X_BUS_VOLTAGE_L_LIMIT_POS; 378 case hwmon_in_crit_alarm: 379 return TMP51X_BUS_VOLTAGE_H_LIMIT_POS; 380 } 381 break; 382 case hwmon_curr: 383 switch (attr) { 384 case hwmon_curr_lcrit_alarm: 385 return TMP51X_SHUNT_CURRENT_L_LIMIT_POS; 386 case hwmon_curr_crit_alarm: 387 return TMP51X_SHUNT_CURRENT_H_LIMIT_POS; 388 } 389 break; 390 case hwmon_power: 391 switch (attr) { 392 case hwmon_power_crit_alarm: 393 return TMP51X_POWER_LIMIT_POS; 394 } 395 break; 396 default: 397 break; 398 } 399 400 return 0; 401 } 402 403 static int tmp51x_read(struct device *dev, enum hwmon_sensor_types type, 404 u32 attr, int channel, long *val) 405 { 406 struct tmp51x_data *data = dev_get_drvdata(dev); 407 int ret; 408 u32 regval; 409 u8 pos = 0, reg = 0; 410 411 reg = tmp51x_get_reg(type, attr, channel); 412 if (reg == 0) 413 return -EOPNOTSUPP; 414 415 if (reg == TMP51X_STATUS) 416 pos = tmp51x_get_status_pos(type, attr, channel); 417 418 ret = regmap_read(data->regmap, reg, ®val); 419 if (ret < 0) 420 return ret; 421 422 return tmp51x_get_value(data, reg, pos, regval, val); 423 } 424 425 static int tmp51x_write(struct device *dev, enum hwmon_sensor_types type, 426 u32 attr, int channel, long val) 427 { 428 u8 reg = 0; 429 430 reg = tmp51x_get_reg(type, attr, channel); 431 if (reg == 0) 432 return -EOPNOTSUPP; 433 434 return tmp51x_set_value(dev_get_drvdata(dev), reg, val); 435 } 436 437 static umode_t tmp51x_is_visible(const void *_data, 438 enum hwmon_sensor_types type, u32 attr, 439 int channel) 440 { 441 const struct tmp51x_data *data = _data; 442 443 switch (type) { 444 case hwmon_temp: 445 if (data->id == tmp512 && channel == 3) 446 return 0; 447 switch (attr) { 448 case hwmon_temp_input: 449 case hwmon_temp_crit_alarm: 450 return 0444; 451 case hwmon_temp_crit: 452 return 0644; 453 case hwmon_temp_crit_hyst: 454 if (channel == 0) 455 return 0644; 456 return 0444; 457 } 458 break; 459 case hwmon_in: 460 switch (attr) { 461 case hwmon_in_input: 462 case hwmon_in_lcrit_alarm: 463 case hwmon_in_crit_alarm: 464 return 0444; 465 case hwmon_in_lcrit: 466 case hwmon_in_crit: 467 return 0644; 468 } 469 break; 470 case hwmon_curr: 471 if (!data->shunt_uohms) 472 return 0; 473 474 switch (attr) { 475 case hwmon_curr_input: 476 case hwmon_curr_lcrit_alarm: 477 case hwmon_curr_crit_alarm: 478 return 0444; 479 case hwmon_curr_lcrit: 480 case hwmon_curr_crit: 481 return 0644; 482 } 483 break; 484 case hwmon_power: 485 if (!data->shunt_uohms) 486 return 0; 487 488 switch (attr) { 489 case hwmon_power_input: 490 case hwmon_power_crit_alarm: 491 return 0444; 492 case hwmon_power_crit: 493 return 0644; 494 } 495 break; 496 default: 497 break; 498 } 499 return 0; 500 } 501 502 static const struct hwmon_channel_info * const tmp51x_info[] = { 503 HWMON_CHANNEL_INFO(temp, 504 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | 505 HWMON_T_CRIT_HYST, 506 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | 507 HWMON_T_CRIT_HYST, 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_CHANNEL_INFO(in, 513 HWMON_I_INPUT | HWMON_I_LCRIT | HWMON_I_LCRIT_ALARM | 514 HWMON_I_CRIT | HWMON_I_CRIT_ALARM), 515 HWMON_CHANNEL_INFO(curr, 516 HWMON_C_INPUT | HWMON_C_LCRIT | HWMON_C_LCRIT_ALARM | 517 HWMON_C_CRIT | HWMON_C_CRIT_ALARM, 518 HWMON_C_INPUT), 519 HWMON_CHANNEL_INFO(power, 520 HWMON_P_INPUT | HWMON_P_CRIT | HWMON_P_CRIT_ALARM), 521 NULL 522 }; 523 524 static const struct hwmon_ops tmp51x_hwmon_ops = { 525 .is_visible = tmp51x_is_visible, 526 .read = tmp51x_read, 527 .write = tmp51x_write, 528 }; 529 530 static const struct hwmon_chip_info tmp51x_chip_info = { 531 .ops = &tmp51x_hwmon_ops, 532 .info = tmp51x_info, 533 }; 534 535 /* 536 * Calibrate the tmp51x following the datasheet method 537 */ 538 static int tmp51x_calibrate(struct tmp51x_data *data) 539 { 540 int vshunt_max = data->pga_gain * 40; 541 u64 max_curr_ma; 542 u32 div; 543 544 /* 545 * If shunt_uohms is equal to 0, the calibration should be set to 0. 546 * The consequence will be that the current and power measurement engine 547 * of the sensor will not work. Temperature and voltage sensing will 548 * continue to work. 549 */ 550 if (data->shunt_uohms == 0) 551 return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 0); 552 553 max_curr_ma = DIV_ROUND_CLOSEST_ULL(vshunt_max * MICRO, data->shunt_uohms); 554 555 /* 556 * Calculate the minimal bit resolution for the current and the power. 557 * Those values will be used during register interpretation. 558 */ 559 data->curr_lsb_ua = DIV_ROUND_CLOSEST_ULL(max_curr_ma * MILLI, 32767); 560 data->pwr_lsb_uw = 20 * data->curr_lsb_ua; 561 562 div = DIV_ROUND_CLOSEST_ULL(data->curr_lsb_ua * data->shunt_uohms, MICRO); 563 564 return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 565 DIV_ROUND_CLOSEST(40960, div)); 566 } 567 568 /* 569 * Initialize the configuration and calibration registers. 570 */ 571 static int tmp51x_init(struct tmp51x_data *data) 572 { 573 unsigned int regval; 574 int ret = regmap_write(data->regmap, TMP51X_SHUNT_CONFIG, 575 data->shunt_config); 576 if (ret < 0) 577 return ret; 578 579 ret = regmap_write(data->regmap, TMP51X_TEMP_CONFIG, data->temp_config); 580 if (ret < 0) 581 return ret; 582 583 // nFactor configuration 584 ret = regmap_update_bits(data->regmap, TMP51X_N_FACTOR_AND_HYST_1, 585 TMP51X_NFACTOR_MASK, data->nfactor[0] << 8); 586 if (ret < 0) 587 return ret; 588 589 ret = regmap_write(data->regmap, TMP51X_N_FACTOR_2, 590 data->nfactor[1] << 8); 591 if (ret < 0) 592 return ret; 593 594 if (data->id == tmp513) { 595 ret = regmap_write(data->regmap, TMP513_N_FACTOR_3, 596 data->nfactor[2] << 8); 597 if (ret < 0) 598 return ret; 599 } 600 601 ret = tmp51x_calibrate(data); 602 if (ret < 0) 603 return ret; 604 605 // Read the status register before using as the datasheet propose 606 return regmap_read(data->regmap, TMP51X_STATUS, ®val); 607 } 608 609 static const struct i2c_device_id tmp51x_id[] = { 610 { "tmp512", tmp512 }, 611 { "tmp513", tmp513 }, 612 { } 613 }; 614 MODULE_DEVICE_TABLE(i2c, tmp51x_id); 615 616 static const struct of_device_id tmp51x_of_match[] = { 617 { 618 .compatible = "ti,tmp512", 619 .data = (void *)tmp512 620 }, 621 { 622 .compatible = "ti,tmp513", 623 .data = (void *)tmp513 624 }, 625 { }, 626 }; 627 MODULE_DEVICE_TABLE(of, tmp51x_of_match); 628 629 static int tmp51x_vbus_range_to_reg(struct device *dev, 630 struct tmp51x_data *data) 631 { 632 if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) { 633 data->shunt_config |= TMP51X_BUS_VOLTAGE_MASK; 634 } else if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_16V) { 635 data->shunt_config &= ~TMP51X_BUS_VOLTAGE_MASK; 636 } else { 637 return dev_err_probe(dev, -EINVAL, 638 "ti,bus-range-microvolt is invalid: %u\n", 639 data->vbus_range_uvolt); 640 } 641 return 0; 642 } 643 644 static int tmp51x_pga_gain_to_reg(struct device *dev, struct tmp51x_data *data) 645 { 646 if (data->pga_gain == 8) { 647 data->shunt_config |= CURRENT_SENSE_VOLTAGE_320_MASK; 648 } else if (data->pga_gain == 4) { 649 data->shunt_config |= CURRENT_SENSE_VOLTAGE_160_MASK; 650 } else if (data->pga_gain == 2) { 651 data->shunt_config |= CURRENT_SENSE_VOLTAGE_80_MASK; 652 } else if (data->pga_gain == 1) { 653 data->shunt_config |= CURRENT_SENSE_VOLTAGE_40_MASK; 654 } else { 655 return dev_err_probe(dev, -EINVAL, 656 "ti,pga-gain is invalid: %u\n", data->pga_gain); 657 } 658 return 0; 659 } 660 661 static int tmp51x_read_properties(struct device *dev, struct tmp51x_data *data) 662 { 663 int ret; 664 u32 nfactor[3]; 665 u32 val; 666 667 ret = device_property_read_u32(dev, "shunt-resistor-micro-ohms", &val); 668 data->shunt_uohms = (ret >= 0) ? val : TMP51X_SHUNT_VALUE_DEFAULT; 669 670 ret = device_property_read_u32(dev, "ti,bus-range-microvolt", &val); 671 data->vbus_range_uvolt = (ret >= 0) ? val : TMP51X_VBUS_RANGE_DEFAULT; 672 ret = tmp51x_vbus_range_to_reg(dev, data); 673 if (ret < 0) 674 return ret; 675 676 ret = device_property_read_u32(dev, "ti,pga-gain", &val); 677 data->pga_gain = (ret >= 0) ? val : TMP51X_PGA_DEFAULT; 678 ret = tmp51x_pga_gain_to_reg(dev, data); 679 if (ret < 0) 680 return ret; 681 682 ret = device_property_read_u32_array(dev, "ti,nfactor", nfactor, 683 (data->id == tmp513) ? 3 : 2); 684 if (ret >= 0) 685 memcpy(data->nfactor, nfactor, (data->id == tmp513) ? 3 : 2); 686 687 // Check if shunt value is compatible with pga-gain 688 if (data->shunt_uohms > data->pga_gain * 40 * MICRO) { 689 return dev_err_probe(dev, -EINVAL, 690 "shunt-resistor: %u too big for pga_gain: %u\n", 691 data->shunt_uohms, data->pga_gain); 692 } 693 694 return 0; 695 } 696 697 static void tmp51x_use_default(struct tmp51x_data *data) 698 { 699 data->vbus_range_uvolt = TMP51X_VBUS_RANGE_DEFAULT; 700 data->pga_gain = TMP51X_PGA_DEFAULT; 701 data->shunt_uohms = TMP51X_SHUNT_VALUE_DEFAULT; 702 } 703 704 static int tmp51x_configure(struct device *dev, struct tmp51x_data *data) 705 { 706 data->shunt_config = TMP51X_SHUNT_CONFIG_DEFAULT; 707 data->temp_config = (data->id == tmp513) ? 708 TMP513_TEMP_CONFIG_DEFAULT : TMP512_TEMP_CONFIG_DEFAULT; 709 710 if (dev->of_node) 711 return tmp51x_read_properties(dev, data); 712 713 tmp51x_use_default(data); 714 715 return 0; 716 } 717 718 static int tmp51x_probe(struct i2c_client *client) 719 { 720 struct device *dev = &client->dev; 721 struct tmp51x_data *data; 722 struct device *hwmon_dev; 723 int ret; 724 725 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 726 if (!data) 727 return -ENOMEM; 728 729 data->id = (uintptr_t)i2c_get_match_data(client); 730 731 ret = tmp51x_configure(dev, data); 732 if (ret < 0) 733 return dev_err_probe(dev, ret, "error configuring the device\n"); 734 735 data->regmap = devm_regmap_init_i2c(client, &tmp51x_regmap_config); 736 if (IS_ERR(data->regmap)) 737 return dev_err_probe(dev, PTR_ERR(data->regmap), 738 "failed to allocate register map\n"); 739 740 ret = tmp51x_init(data); 741 if (ret < 0) 742 return dev_err_probe(dev, ret, "error configuring the device\n"); 743 744 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, 745 data, 746 &tmp51x_chip_info, 747 NULL); 748 if (IS_ERR(hwmon_dev)) 749 return PTR_ERR(hwmon_dev); 750 751 dev_dbg(dev, "power monitor %s\n", client->name); 752 753 return 0; 754 } 755 756 static struct i2c_driver tmp51x_driver = { 757 .driver = { 758 .name = "tmp51x", 759 .of_match_table = tmp51x_of_match, 760 }, 761 .probe = tmp51x_probe, 762 .id_table = tmp51x_id, 763 }; 764 765 module_i2c_driver(tmp51x_driver); 766 767 MODULE_AUTHOR("Eric Tremblay <etremblay@distechcontrols.com>"); 768 MODULE_DESCRIPTION("tmp51x driver"); 769 MODULE_LICENSE("GPL"); 770