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 * MILLI, data->shunt_uohms); 207 break; 208 case TMP51X_BUS_VOLTAGE_RESULT: 209 case TMP51X_BUS_VOLTAGE_H_LIMIT: 210 case TMP51X_BUS_VOLTAGE_L_LIMIT: 211 // 1lsb = 4mV 212 *val = (regval >> TMP51X_BUS_VOLTAGE_SHIFT) * 4; 213 break; 214 case TMP51X_POWER_RESULT: 215 case TMP51X_POWER_LIMIT: 216 // Power = (current * BusVoltage) / 5000 217 *val = regval * data->pwr_lsb_uw; 218 break; 219 case TMP51X_BUS_CURRENT_RESULT: 220 // Current = (ShuntVoltage * CalibrationRegister) / 4096 221 *val = sign_extend32(regval, 15) * (long)data->curr_lsb_ua; 222 *val = DIV_ROUND_CLOSEST(*val, MILLI); 223 break; 224 case TMP51X_LOCAL_TEMP_RESULT: 225 case TMP51X_REMOTE_TEMP_RESULT_1: 226 case TMP51X_REMOTE_TEMP_RESULT_2: 227 case TMP513_REMOTE_TEMP_RESULT_3: 228 case TMP51X_LOCAL_TEMP_LIMIT: 229 case TMP51X_REMOTE_TEMP_LIMIT_1: 230 case TMP51X_REMOTE_TEMP_LIMIT_2: 231 case TMP513_REMOTE_TEMP_LIMIT_3: 232 // 1lsb = 0.0625 degrees centigrade 233 *val = sign_extend32(regval, 15) >> TMP51X_TEMP_SHIFT; 234 *val = DIV_ROUND_CLOSEST(*val * 625, 10); 235 break; 236 case TMP51X_N_FACTOR_AND_HYST_1: 237 // 1lsb = 0.5 degrees centigrade 238 *val = (regval & TMP51X_HYST_MASK) * 500; 239 break; 240 default: 241 // Programmer goofed 242 WARN_ON_ONCE(1); 243 *val = 0; 244 return -EOPNOTSUPP; 245 } 246 247 return 0; 248 } 249 250 static int tmp51x_set_value(struct tmp51x_data *data, u8 reg, long val) 251 { 252 int regval, max_val; 253 u32 mask = 0; 254 255 switch (reg) { 256 case TMP51X_SHUNT_CURRENT_H_LIMIT: 257 case TMP51X_SHUNT_CURRENT_L_LIMIT: 258 /* 259 * The user enter current value and we convert it to 260 * voltage. 1lsb = 10uV 261 */ 262 val = DIV_ROUND_CLOSEST(val * data->shunt_uohms, 10 * MILLI); 263 max_val = U16_MAX >> tmp51x_get_pga_shift(data); 264 regval = clamp_val(val, -max_val, max_val); 265 break; 266 case TMP51X_BUS_VOLTAGE_H_LIMIT: 267 case TMP51X_BUS_VOLTAGE_L_LIMIT: 268 // 1lsb = 4mV 269 max_val = (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) ? 270 MAX_BUS_VOLTAGE_32_LIMIT : MAX_BUS_VOLTAGE_16_LIMIT; 271 272 val = clamp_val(DIV_ROUND_CLOSEST(val, 4), 0, max_val); 273 regval = val << TMP51X_BUS_VOLTAGE_SHIFT; 274 break; 275 case TMP51X_POWER_LIMIT: 276 regval = clamp_val(DIV_ROUND_CLOSEST(val, data->pwr_lsb_uw), 0, 277 U16_MAX); 278 break; 279 case TMP51X_LOCAL_TEMP_LIMIT: 280 case TMP51X_REMOTE_TEMP_LIMIT_1: 281 case TMP51X_REMOTE_TEMP_LIMIT_2: 282 case TMP513_REMOTE_TEMP_LIMIT_3: 283 // 1lsb = 0.0625 degrees centigrade 284 val = clamp_val(val, MIN_TEMP_LIMIT, MAX_TEMP_LIMIT); 285 regval = DIV_ROUND_CLOSEST(val * 10, 625) << TMP51X_TEMP_SHIFT; 286 break; 287 case TMP51X_N_FACTOR_AND_HYST_1: 288 // 1lsb = 0.5 degrees centigrade 289 val = clamp_val(val, 0, MAX_TEMP_HYST); 290 regval = DIV_ROUND_CLOSEST(val, 500); 291 mask = TMP51X_HYST_MASK; 292 break; 293 default: 294 // Programmer goofed 295 WARN_ON_ONCE(1); 296 return -EOPNOTSUPP; 297 } 298 299 if (mask == 0) 300 return regmap_write(data->regmap, reg, regval); 301 else 302 return regmap_update_bits(data->regmap, reg, mask, regval); 303 } 304 305 static u8 tmp51x_get_reg(enum hwmon_sensor_types type, u32 attr, int channel) 306 { 307 switch (type) { 308 case hwmon_temp: 309 switch (attr) { 310 case hwmon_temp_input: 311 return TMP51X_TEMP_INPUT[channel]; 312 case hwmon_temp_crit_alarm: 313 return TMP51X_STATUS; 314 case hwmon_temp_crit: 315 return TMP51X_TEMP_CRIT[channel]; 316 case hwmon_temp_crit_hyst: 317 return TMP51X_TEMP_CRIT_HYST[channel]; 318 } 319 break; 320 case hwmon_in: 321 switch (attr) { 322 case hwmon_in_input: 323 return TMP51X_BUS_VOLTAGE_RESULT; 324 case hwmon_in_lcrit_alarm: 325 case hwmon_in_crit_alarm: 326 return TMP51X_STATUS; 327 case hwmon_in_lcrit: 328 return TMP51X_BUS_VOLTAGE_L_LIMIT; 329 case hwmon_in_crit: 330 return TMP51X_BUS_VOLTAGE_H_LIMIT; 331 } 332 break; 333 case hwmon_curr: 334 switch (attr) { 335 case hwmon_curr_input: 336 return TMP51X_CURR_INPUT[channel]; 337 case hwmon_curr_lcrit_alarm: 338 case hwmon_curr_crit_alarm: 339 return TMP51X_STATUS; 340 case hwmon_curr_lcrit: 341 return TMP51X_SHUNT_CURRENT_L_LIMIT; 342 case hwmon_curr_crit: 343 return TMP51X_SHUNT_CURRENT_H_LIMIT; 344 } 345 break; 346 case hwmon_power: 347 switch (attr) { 348 case hwmon_power_input: 349 return TMP51X_POWER_RESULT; 350 case hwmon_power_crit_alarm: 351 return TMP51X_STATUS; 352 case hwmon_power_crit: 353 return TMP51X_POWER_LIMIT; 354 } 355 break; 356 default: 357 break; 358 } 359 360 return 0; 361 } 362 363 static u8 tmp51x_get_status_pos(enum hwmon_sensor_types type, u32 attr, 364 int channel) 365 { 366 switch (type) { 367 case hwmon_temp: 368 switch (attr) { 369 case hwmon_temp_crit_alarm: 370 return TMP51X_TEMP_CRIT_ALARM[channel]; 371 } 372 break; 373 case hwmon_in: 374 switch (attr) { 375 case hwmon_in_lcrit_alarm: 376 return TMP51X_BUS_VOLTAGE_L_LIMIT_POS; 377 case hwmon_in_crit_alarm: 378 return TMP51X_BUS_VOLTAGE_H_LIMIT_POS; 379 } 380 break; 381 case hwmon_curr: 382 switch (attr) { 383 case hwmon_curr_lcrit_alarm: 384 return TMP51X_SHUNT_CURRENT_L_LIMIT_POS; 385 case hwmon_curr_crit_alarm: 386 return TMP51X_SHUNT_CURRENT_H_LIMIT_POS; 387 } 388 break; 389 case hwmon_power: 390 switch (attr) { 391 case hwmon_power_crit_alarm: 392 return TMP51X_POWER_LIMIT_POS; 393 } 394 break; 395 default: 396 break; 397 } 398 399 return 0; 400 } 401 402 static int tmp51x_read(struct device *dev, enum hwmon_sensor_types type, 403 u32 attr, int channel, long *val) 404 { 405 struct tmp51x_data *data = dev_get_drvdata(dev); 406 int ret; 407 u32 regval; 408 u8 pos = 0, reg = 0; 409 410 reg = tmp51x_get_reg(type, attr, channel); 411 if (reg == 0) 412 return -EOPNOTSUPP; 413 414 if (reg == TMP51X_STATUS) 415 pos = tmp51x_get_status_pos(type, attr, channel); 416 417 ret = regmap_read(data->regmap, reg, ®val); 418 if (ret < 0) 419 return ret; 420 421 return tmp51x_get_value(data, reg, pos, regval, val); 422 } 423 424 static int tmp51x_write(struct device *dev, enum hwmon_sensor_types type, 425 u32 attr, int channel, long val) 426 { 427 u8 reg = 0; 428 429 reg = tmp51x_get_reg(type, attr, channel); 430 if (reg == 0) 431 return -EOPNOTSUPP; 432 433 return tmp51x_set_value(dev_get_drvdata(dev), reg, val); 434 } 435 436 static umode_t tmp51x_is_visible(const void *_data, 437 enum hwmon_sensor_types type, u32 attr, 438 int channel) 439 { 440 const struct tmp51x_data *data = _data; 441 442 switch (type) { 443 case hwmon_temp: 444 if (data->id == tmp512 && channel == 3) 445 return 0; 446 switch (attr) { 447 case hwmon_temp_input: 448 case hwmon_temp_crit_alarm: 449 return 0444; 450 case hwmon_temp_crit: 451 return 0644; 452 case hwmon_temp_crit_hyst: 453 if (channel == 0) 454 return 0644; 455 return 0444; 456 } 457 break; 458 case hwmon_in: 459 switch (attr) { 460 case hwmon_in_input: 461 case hwmon_in_lcrit_alarm: 462 case hwmon_in_crit_alarm: 463 return 0444; 464 case hwmon_in_lcrit: 465 case hwmon_in_crit: 466 return 0644; 467 } 468 break; 469 case hwmon_curr: 470 if (!data->shunt_uohms) 471 return 0; 472 473 switch (attr) { 474 case hwmon_curr_input: 475 case hwmon_curr_lcrit_alarm: 476 case hwmon_curr_crit_alarm: 477 return 0444; 478 case hwmon_curr_lcrit: 479 case hwmon_curr_crit: 480 return 0644; 481 } 482 break; 483 case hwmon_power: 484 if (!data->shunt_uohms) 485 return 0; 486 487 switch (attr) { 488 case hwmon_power_input: 489 case hwmon_power_crit_alarm: 490 return 0444; 491 case hwmon_power_crit: 492 return 0644; 493 } 494 break; 495 default: 496 break; 497 } 498 return 0; 499 } 500 501 static const struct hwmon_channel_info * const tmp51x_info[] = { 502 HWMON_CHANNEL_INFO(temp, 503 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | 504 HWMON_T_CRIT_HYST, 505 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | 506 HWMON_T_CRIT_HYST, 507 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | 508 HWMON_T_CRIT_HYST, 509 HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | 510 HWMON_T_CRIT_HYST), 511 HWMON_CHANNEL_INFO(in, 512 HWMON_I_INPUT | HWMON_I_LCRIT | HWMON_I_LCRIT_ALARM | 513 HWMON_I_CRIT | HWMON_I_CRIT_ALARM), 514 HWMON_CHANNEL_INFO(curr, 515 HWMON_C_INPUT | HWMON_C_LCRIT | HWMON_C_LCRIT_ALARM | 516 HWMON_C_CRIT | HWMON_C_CRIT_ALARM, 517 HWMON_C_INPUT), 518 HWMON_CHANNEL_INFO(power, 519 HWMON_P_INPUT | HWMON_P_CRIT | HWMON_P_CRIT_ALARM), 520 NULL 521 }; 522 523 static const struct hwmon_ops tmp51x_hwmon_ops = { 524 .is_visible = tmp51x_is_visible, 525 .read = tmp51x_read, 526 .write = tmp51x_write, 527 }; 528 529 static const struct hwmon_chip_info tmp51x_chip_info = { 530 .ops = &tmp51x_hwmon_ops, 531 .info = tmp51x_info, 532 }; 533 534 /* 535 * Calibrate the tmp51x following the datasheet method 536 */ 537 static int tmp51x_calibrate(struct tmp51x_data *data) 538 { 539 int vshunt_max = data->pga_gain * 40; 540 u64 max_curr_ma; 541 u32 div; 542 543 /* 544 * If shunt_uohms is equal to 0, the calibration should be set to 0. 545 * The consequence will be that the current and power measurement engine 546 * of the sensor will not work. Temperature and voltage sensing will 547 * continue to work. 548 */ 549 if (data->shunt_uohms == 0) 550 return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 0); 551 552 max_curr_ma = DIV_ROUND_CLOSEST_ULL(vshunt_max * MICRO, data->shunt_uohms); 553 554 /* 555 * Calculate the minimal bit resolution for the current and the power. 556 * Those values will be used during register interpretation. 557 */ 558 data->curr_lsb_ua = DIV_ROUND_CLOSEST_ULL(max_curr_ma * MILLI, 32767); 559 data->pwr_lsb_uw = 20 * data->curr_lsb_ua; 560 561 div = DIV_ROUND_CLOSEST_ULL(data->curr_lsb_ua * data->shunt_uohms, MICRO); 562 563 return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 564 DIV_ROUND_CLOSEST(40960, div)); 565 } 566 567 /* 568 * Initialize the configuration and calibration registers. 569 */ 570 static int tmp51x_init(struct tmp51x_data *data) 571 { 572 unsigned int regval; 573 int ret = regmap_write(data->regmap, TMP51X_SHUNT_CONFIG, 574 data->shunt_config); 575 if (ret < 0) 576 return ret; 577 578 ret = regmap_write(data->regmap, TMP51X_TEMP_CONFIG, data->temp_config); 579 if (ret < 0) 580 return ret; 581 582 // nFactor configuration 583 ret = regmap_update_bits(data->regmap, TMP51X_N_FACTOR_AND_HYST_1, 584 TMP51X_NFACTOR_MASK, data->nfactor[0] << 8); 585 if (ret < 0) 586 return ret; 587 588 ret = regmap_write(data->regmap, TMP51X_N_FACTOR_2, 589 data->nfactor[1] << 8); 590 if (ret < 0) 591 return ret; 592 593 if (data->id == tmp513) { 594 ret = regmap_write(data->regmap, TMP513_N_FACTOR_3, 595 data->nfactor[2] << 8); 596 if (ret < 0) 597 return ret; 598 } 599 600 ret = tmp51x_calibrate(data); 601 if (ret < 0) 602 return ret; 603 604 // Read the status register before using as the datasheet propose 605 return regmap_read(data->regmap, TMP51X_STATUS, ®val); 606 } 607 608 static const struct i2c_device_id tmp51x_id[] = { 609 { "tmp512", tmp512 }, 610 { "tmp513", tmp513 }, 611 { } 612 }; 613 MODULE_DEVICE_TABLE(i2c, tmp51x_id); 614 615 static const struct of_device_id tmp51x_of_match[] = { 616 { 617 .compatible = "ti,tmp512", 618 .data = (void *)tmp512 619 }, 620 { 621 .compatible = "ti,tmp513", 622 .data = (void *)tmp513 623 }, 624 { }, 625 }; 626 MODULE_DEVICE_TABLE(of, tmp51x_of_match); 627 628 static int tmp51x_vbus_range_to_reg(struct device *dev, 629 struct tmp51x_data *data) 630 { 631 if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) { 632 data->shunt_config |= TMP51X_BUS_VOLTAGE_MASK; 633 } else if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_16V) { 634 data->shunt_config &= ~TMP51X_BUS_VOLTAGE_MASK; 635 } else { 636 return dev_err_probe(dev, -EINVAL, 637 "ti,bus-range-microvolt is invalid: %u\n", 638 data->vbus_range_uvolt); 639 } 640 return 0; 641 } 642 643 static int tmp51x_pga_gain_to_reg(struct device *dev, struct tmp51x_data *data) 644 { 645 if (data->pga_gain == 8) { 646 data->shunt_config |= CURRENT_SENSE_VOLTAGE_320_MASK; 647 } else if (data->pga_gain == 4) { 648 data->shunt_config |= CURRENT_SENSE_VOLTAGE_160_MASK; 649 } else if (data->pga_gain == 2) { 650 data->shunt_config |= CURRENT_SENSE_VOLTAGE_80_MASK; 651 } else if (data->pga_gain == 1) { 652 data->shunt_config |= CURRENT_SENSE_VOLTAGE_40_MASK; 653 } else { 654 return dev_err_probe(dev, -EINVAL, 655 "ti,pga-gain is invalid: %u\n", data->pga_gain); 656 } 657 return 0; 658 } 659 660 static int tmp51x_read_properties(struct device *dev, struct tmp51x_data *data) 661 { 662 int ret; 663 u32 nfactor[3]; 664 u32 val; 665 666 ret = device_property_read_u32(dev, "shunt-resistor-micro-ohms", &val); 667 data->shunt_uohms = (ret >= 0) ? val : TMP51X_SHUNT_VALUE_DEFAULT; 668 669 ret = device_property_read_u32(dev, "ti,bus-range-microvolt", &val); 670 data->vbus_range_uvolt = (ret >= 0) ? val : TMP51X_VBUS_RANGE_DEFAULT; 671 ret = tmp51x_vbus_range_to_reg(dev, data); 672 if (ret < 0) 673 return ret; 674 675 ret = device_property_read_u32(dev, "ti,pga-gain", &val); 676 data->pga_gain = (ret >= 0) ? val : TMP51X_PGA_DEFAULT; 677 ret = tmp51x_pga_gain_to_reg(dev, data); 678 if (ret < 0) 679 return ret; 680 681 ret = device_property_read_u32_array(dev, "ti,nfactor", nfactor, 682 (data->id == tmp513) ? 3 : 2); 683 if (ret >= 0) 684 memcpy(data->nfactor, nfactor, (data->id == tmp513) ? 3 : 2); 685 686 // Check if shunt value is compatible with pga-gain 687 if (data->shunt_uohms > data->pga_gain * 40 * MICRO) { 688 return dev_err_probe(dev, -EINVAL, 689 "shunt-resistor: %u too big for pga_gain: %u\n", 690 data->shunt_uohms, data->pga_gain); 691 } 692 693 return 0; 694 } 695 696 static void tmp51x_use_default(struct tmp51x_data *data) 697 { 698 data->vbus_range_uvolt = TMP51X_VBUS_RANGE_DEFAULT; 699 data->pga_gain = TMP51X_PGA_DEFAULT; 700 data->shunt_uohms = TMP51X_SHUNT_VALUE_DEFAULT; 701 } 702 703 static int tmp51x_configure(struct device *dev, struct tmp51x_data *data) 704 { 705 data->shunt_config = TMP51X_SHUNT_CONFIG_DEFAULT; 706 data->temp_config = (data->id == tmp513) ? 707 TMP513_TEMP_CONFIG_DEFAULT : TMP512_TEMP_CONFIG_DEFAULT; 708 709 if (dev->of_node) 710 return tmp51x_read_properties(dev, data); 711 712 tmp51x_use_default(data); 713 714 return 0; 715 } 716 717 static int tmp51x_probe(struct i2c_client *client) 718 { 719 struct device *dev = &client->dev; 720 struct tmp51x_data *data; 721 struct device *hwmon_dev; 722 int ret; 723 724 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 725 if (!data) 726 return -ENOMEM; 727 728 data->id = (uintptr_t)i2c_get_match_data(client); 729 730 ret = tmp51x_configure(dev, data); 731 if (ret < 0) 732 return dev_err_probe(dev, ret, "error configuring the device\n"); 733 734 data->regmap = devm_regmap_init_i2c(client, &tmp51x_regmap_config); 735 if (IS_ERR(data->regmap)) 736 return dev_err_probe(dev, PTR_ERR(data->regmap), 737 "failed to allocate register map\n"); 738 739 ret = tmp51x_init(data); 740 if (ret < 0) 741 return dev_err_probe(dev, ret, "error configuring the device\n"); 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