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 // Mask and shift 77 #define CURRENT_SENSE_VOLTAGE_320_MASK 0x1800 78 #define CURRENT_SENSE_VOLTAGE_160_MASK 0x1000 79 #define CURRENT_SENSE_VOLTAGE_80_MASK 0x0800 80 #define CURRENT_SENSE_VOLTAGE_40_MASK 0 81 82 #define TMP51X_BUS_VOLTAGE_MASK 0x2000 83 #define TMP51X_NFACTOR_MASK 0xFF00 84 #define TMP51X_HYST_MASK 0x00FF 85 86 #define TMP51X_BUS_VOLTAGE_SHIFT 3 87 #define TMP51X_TEMP_SHIFT 3 88 89 // Alarms 90 #define TMP51X_SHUNT_CURRENT_H_LIMIT_POS 15 91 #define TMP51X_SHUNT_CURRENT_L_LIMIT_POS 14 92 #define TMP51X_BUS_VOLTAGE_H_LIMIT_POS 13 93 #define TMP51X_BUS_VOLTAGE_L_LIMIT_POS 12 94 #define TMP51X_POWER_LIMIT_POS 11 95 #define TMP51X_LOCAL_TEMP_LIMIT_POS 10 96 #define TMP51X_REMOTE_TEMP_LIMIT_1_POS 9 97 #define TMP51X_REMOTE_TEMP_LIMIT_2_POS 8 98 #define TMP513_REMOTE_TEMP_LIMIT_3_POS 7 99 100 #define TMP51X_VBUS_RANGE_32V 32000000 101 #define TMP51X_VBUS_RANGE_16V 16000000 102 103 // Max and Min value 104 #define MAX_BUS_VOLTAGE_32_LIMIT 32764 105 #define MAX_BUS_VOLTAGE_16_LIMIT 16382 106 107 // Max possible value is -256 to +256 but datasheet indicated -40 to 125. 108 #define MAX_TEMP_LIMIT 125000 109 #define MIN_TEMP_LIMIT -40000 110 111 #define MAX_TEMP_HYST 127500 112 113 #define TMP512_MAX_CHANNELS 3 114 #define TMP513_MAX_CHANNELS 4 115 116 #define TMP51X_TEMP_CONFIG_CONV_RATE GENMASK(9, 7) 117 #define TMP51X_TEMP_CONFIG_RC BIT(10) 118 #define TMP51X_TEMP_CHANNEL_MASK(n) (GENMASK((n) - 1, 0) << 11) 119 #define TMP51X_TEMP_CONFIG_CONT BIT(15) 120 #define TMP51X_TEMP_CONFIG_DEFAULT(n) \ 121 (TMP51X_TEMP_CHANNEL_MASK(n) | TMP51X_TEMP_CONFIG_CONT | \ 122 TMP51X_TEMP_CONFIG_CONV_RATE | TMP51X_TEMP_CONFIG_RC) 123 124 static const u8 TMP51X_TEMP_INPUT[4] = { 125 TMP51X_LOCAL_TEMP_RESULT, 126 TMP51X_REMOTE_TEMP_RESULT_1, 127 TMP51X_REMOTE_TEMP_RESULT_2, 128 TMP513_REMOTE_TEMP_RESULT_3 129 }; 130 131 static const u8 TMP51X_TEMP_CRIT[4] = { 132 TMP51X_LOCAL_TEMP_LIMIT, 133 TMP51X_REMOTE_TEMP_LIMIT_1, 134 TMP51X_REMOTE_TEMP_LIMIT_2, 135 TMP513_REMOTE_TEMP_LIMIT_3 136 }; 137 138 static const u8 TMP51X_TEMP_CRIT_ALARM[4] = { 139 TMP51X_LOCAL_TEMP_LIMIT_POS, 140 TMP51X_REMOTE_TEMP_LIMIT_1_POS, 141 TMP51X_REMOTE_TEMP_LIMIT_2_POS, 142 TMP513_REMOTE_TEMP_LIMIT_3_POS 143 }; 144 145 static const u8 TMP51X_TEMP_CRIT_HYST[4] = { 146 TMP51X_N_FACTOR_AND_HYST_1, 147 TMP51X_N_FACTOR_AND_HYST_1, 148 TMP51X_N_FACTOR_AND_HYST_1, 149 TMP51X_N_FACTOR_AND_HYST_1 150 }; 151 152 static const u8 TMP51X_CURR_INPUT[2] = { 153 TMP51X_SHUNT_CURRENT_RESULT, 154 TMP51X_BUS_CURRENT_RESULT 155 }; 156 157 static struct regmap_config tmp51x_regmap_config = { 158 .reg_bits = 8, 159 .val_bits = 16, 160 .max_register = TMP51X_MAX_REGISTER_ADDR, 161 }; 162 163 struct tmp51x_data { 164 u16 shunt_config; 165 u16 pga_gain; 166 u32 vbus_range_uvolt; 167 168 u16 temp_config; 169 u32 nfactor[3]; 170 171 u32 shunt_uohms; 172 173 u32 curr_lsb_ua; 174 u32 pwr_lsb_uw; 175 176 u8 max_channels; 177 struct regmap *regmap; 178 }; 179 180 // Set the shift based on the gain 8=4, 4=3, 2=2, 1=1 181 static inline u8 tmp51x_get_pga_shift(struct tmp51x_data *data) 182 { 183 return 5 - ffs(data->pga_gain); 184 } 185 186 static int tmp51x_get_value(struct tmp51x_data *data, u8 reg, u8 pos, 187 unsigned int regval, long *val) 188 { 189 switch (reg) { 190 case TMP51X_STATUS: 191 *val = (regval >> pos) & 1; 192 break; 193 case TMP51X_SHUNT_CURRENT_RESULT: 194 case TMP51X_SHUNT_CURRENT_H_LIMIT: 195 case TMP51X_SHUNT_CURRENT_L_LIMIT: 196 /* 197 * The valus is read in voltage in the chip but reported as 198 * current to the user. 199 * 2's complement number shifted by one to four depending 200 * on the pga gain setting. 1lsb = 10uV 201 */ 202 *val = sign_extend32(regval, 17 - tmp51x_get_pga_shift(data)); 203 *val = DIV_ROUND_CLOSEST(*val * 10000, data->shunt_uohms); 204 break; 205 case TMP51X_BUS_VOLTAGE_RESULT: 206 case TMP51X_BUS_VOLTAGE_H_LIMIT: 207 case TMP51X_BUS_VOLTAGE_L_LIMIT: 208 // 1lsb = 4mV 209 *val = (regval >> TMP51X_BUS_VOLTAGE_SHIFT) * 4; 210 break; 211 case TMP51X_POWER_RESULT: 212 case TMP51X_POWER_LIMIT: 213 // Power = (current * BusVoltage) / 5000 214 *val = regval * data->pwr_lsb_uw; 215 break; 216 case TMP51X_BUS_CURRENT_RESULT: 217 // Current = (ShuntVoltage * CalibrationRegister) / 4096 218 *val = sign_extend32(regval, 16) * data->curr_lsb_ua; 219 *val = DIV_ROUND_CLOSEST(*val, 1000); 220 break; 221 case TMP51X_LOCAL_TEMP_RESULT: 222 case TMP51X_REMOTE_TEMP_RESULT_1: 223 case TMP51X_REMOTE_TEMP_RESULT_2: 224 case TMP513_REMOTE_TEMP_RESULT_3: 225 case TMP51X_LOCAL_TEMP_LIMIT: 226 case TMP51X_REMOTE_TEMP_LIMIT_1: 227 case TMP51X_REMOTE_TEMP_LIMIT_2: 228 case TMP513_REMOTE_TEMP_LIMIT_3: 229 // 1lsb = 0.0625 degrees centigrade 230 *val = sign_extend32(regval, 16) >> TMP51X_TEMP_SHIFT; 231 *val = DIV_ROUND_CLOSEST(*val * 625, 10); 232 break; 233 case TMP51X_N_FACTOR_AND_HYST_1: 234 // 1lsb = 0.5 degrees centigrade 235 *val = (regval & TMP51X_HYST_MASK) * 500; 236 break; 237 default: 238 // Programmer goofed 239 WARN_ON_ONCE(1); 240 *val = 0; 241 return -EOPNOTSUPP; 242 } 243 244 return 0; 245 } 246 247 static int tmp51x_set_value(struct tmp51x_data *data, u8 reg, long val) 248 { 249 int regval, max_val; 250 u32 mask = 0; 251 252 switch (reg) { 253 case TMP51X_SHUNT_CURRENT_H_LIMIT: 254 case TMP51X_SHUNT_CURRENT_L_LIMIT: 255 /* 256 * The user enter current value and we convert it to 257 * voltage. 1lsb = 10uV 258 */ 259 val = DIV_ROUND_CLOSEST(val * data->shunt_uohms, 10000); 260 max_val = U16_MAX >> tmp51x_get_pga_shift(data); 261 regval = clamp_val(val, -max_val, max_val); 262 break; 263 case TMP51X_BUS_VOLTAGE_H_LIMIT: 264 case TMP51X_BUS_VOLTAGE_L_LIMIT: 265 // 1lsb = 4mV 266 max_val = (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) ? 267 MAX_BUS_VOLTAGE_32_LIMIT : MAX_BUS_VOLTAGE_16_LIMIT; 268 269 val = clamp_val(DIV_ROUND_CLOSEST(val, 4), 0, max_val); 270 regval = val << TMP51X_BUS_VOLTAGE_SHIFT; 271 break; 272 case TMP51X_POWER_LIMIT: 273 regval = clamp_val(DIV_ROUND_CLOSEST(val, data->pwr_lsb_uw), 0, 274 U16_MAX); 275 break; 276 case TMP51X_LOCAL_TEMP_LIMIT: 277 case TMP51X_REMOTE_TEMP_LIMIT_1: 278 case TMP51X_REMOTE_TEMP_LIMIT_2: 279 case TMP513_REMOTE_TEMP_LIMIT_3: 280 // 1lsb = 0.0625 degrees centigrade 281 val = clamp_val(val, MIN_TEMP_LIMIT, MAX_TEMP_LIMIT); 282 regval = DIV_ROUND_CLOSEST(val * 10, 625) << TMP51X_TEMP_SHIFT; 283 break; 284 case TMP51X_N_FACTOR_AND_HYST_1: 285 // 1lsb = 0.5 degrees centigrade 286 val = clamp_val(val, 0, MAX_TEMP_HYST); 287 regval = DIV_ROUND_CLOSEST(val, 500); 288 mask = TMP51X_HYST_MASK; 289 break; 290 default: 291 // Programmer goofed 292 WARN_ON_ONCE(1); 293 return -EOPNOTSUPP; 294 } 295 296 if (mask == 0) 297 return regmap_write(data->regmap, reg, regval); 298 else 299 return regmap_update_bits(data->regmap, reg, mask, regval); 300 } 301 302 static u8 tmp51x_get_reg(enum hwmon_sensor_types type, u32 attr, int channel) 303 { 304 switch (type) { 305 case hwmon_temp: 306 switch (attr) { 307 case hwmon_temp_input: 308 return TMP51X_TEMP_INPUT[channel]; 309 case hwmon_temp_crit_alarm: 310 return TMP51X_STATUS; 311 case hwmon_temp_crit: 312 return TMP51X_TEMP_CRIT[channel]; 313 case hwmon_temp_crit_hyst: 314 return TMP51X_TEMP_CRIT_HYST[channel]; 315 } 316 break; 317 case hwmon_in: 318 switch (attr) { 319 case hwmon_in_input: 320 return TMP51X_BUS_VOLTAGE_RESULT; 321 case hwmon_in_lcrit_alarm: 322 case hwmon_in_crit_alarm: 323 return TMP51X_STATUS; 324 case hwmon_in_lcrit: 325 return TMP51X_BUS_VOLTAGE_L_LIMIT; 326 case hwmon_in_crit: 327 return TMP51X_BUS_VOLTAGE_H_LIMIT; 328 } 329 break; 330 case hwmon_curr: 331 switch (attr) { 332 case hwmon_curr_input: 333 return TMP51X_CURR_INPUT[channel]; 334 case hwmon_curr_lcrit_alarm: 335 case hwmon_curr_crit_alarm: 336 return TMP51X_STATUS; 337 case hwmon_curr_lcrit: 338 return TMP51X_SHUNT_CURRENT_L_LIMIT; 339 case hwmon_curr_crit: 340 return TMP51X_SHUNT_CURRENT_H_LIMIT; 341 } 342 break; 343 case hwmon_power: 344 switch (attr) { 345 case hwmon_power_input: 346 return TMP51X_POWER_RESULT; 347 case hwmon_power_crit_alarm: 348 return TMP51X_STATUS; 349 case hwmon_power_crit: 350 return TMP51X_POWER_LIMIT; 351 } 352 break; 353 default: 354 break; 355 } 356 357 return 0; 358 } 359 360 static u8 tmp51x_get_status_pos(enum hwmon_sensor_types type, u32 attr, 361 int channel) 362 { 363 switch (type) { 364 case hwmon_temp: 365 switch (attr) { 366 case hwmon_temp_crit_alarm: 367 return TMP51X_TEMP_CRIT_ALARM[channel]; 368 } 369 break; 370 case hwmon_in: 371 switch (attr) { 372 case hwmon_in_lcrit_alarm: 373 return TMP51X_BUS_VOLTAGE_L_LIMIT_POS; 374 case hwmon_in_crit_alarm: 375 return TMP51X_BUS_VOLTAGE_H_LIMIT_POS; 376 } 377 break; 378 case hwmon_curr: 379 switch (attr) { 380 case hwmon_curr_lcrit_alarm: 381 return TMP51X_SHUNT_CURRENT_L_LIMIT_POS; 382 case hwmon_curr_crit_alarm: 383 return TMP51X_SHUNT_CURRENT_H_LIMIT_POS; 384 } 385 break; 386 case hwmon_power: 387 switch (attr) { 388 case hwmon_power_crit_alarm: 389 return TMP51X_POWER_LIMIT_POS; 390 } 391 break; 392 default: 393 break; 394 } 395 396 return 0; 397 } 398 399 static int tmp51x_read(struct device *dev, enum hwmon_sensor_types type, 400 u32 attr, int channel, long *val) 401 { 402 struct tmp51x_data *data = dev_get_drvdata(dev); 403 int ret; 404 u32 regval; 405 u8 pos = 0, reg = 0; 406 407 reg = tmp51x_get_reg(type, attr, channel); 408 if (reg == 0) 409 return -EOPNOTSUPP; 410 411 if (reg == TMP51X_STATUS) 412 pos = tmp51x_get_status_pos(type, attr, channel); 413 414 ret = regmap_read(data->regmap, reg, ®val); 415 if (ret < 0) 416 return ret; 417 418 return tmp51x_get_value(data, reg, pos, regval, val); 419 } 420 421 static int tmp51x_write(struct device *dev, enum hwmon_sensor_types type, 422 u32 attr, int channel, long val) 423 { 424 u8 reg = 0; 425 426 reg = tmp51x_get_reg(type, attr, channel); 427 if (reg == 0) 428 return -EOPNOTSUPP; 429 430 return tmp51x_set_value(dev_get_drvdata(dev), reg, val); 431 } 432 433 static umode_t tmp51x_is_visible(const void *_data, 434 enum hwmon_sensor_types type, u32 attr, 435 int channel) 436 { 437 const struct tmp51x_data *data = _data; 438 439 switch (type) { 440 case hwmon_temp: 441 if (channel >= data->max_channels) 442 return 0; 443 switch (attr) { 444 case hwmon_temp_input: 445 case hwmon_temp_crit_alarm: 446 return 0444; 447 case hwmon_temp_crit: 448 return 0644; 449 case hwmon_temp_crit_hyst: 450 if (channel == 0) 451 return 0644; 452 return 0444; 453 } 454 break; 455 case hwmon_in: 456 switch (attr) { 457 case hwmon_in_input: 458 case hwmon_in_lcrit_alarm: 459 case hwmon_in_crit_alarm: 460 return 0444; 461 case hwmon_in_lcrit: 462 case hwmon_in_crit: 463 return 0644; 464 } 465 break; 466 case hwmon_curr: 467 if (!data->shunt_uohms) 468 return 0; 469 470 switch (attr) { 471 case hwmon_curr_input: 472 case hwmon_curr_lcrit_alarm: 473 case hwmon_curr_crit_alarm: 474 return 0444; 475 case hwmon_curr_lcrit: 476 case hwmon_curr_crit: 477 return 0644; 478 } 479 break; 480 case hwmon_power: 481 if (!data->shunt_uohms) 482 return 0; 483 484 switch (attr) { 485 case hwmon_power_input: 486 case hwmon_power_crit_alarm: 487 return 0444; 488 case hwmon_power_crit: 489 return 0644; 490 } 491 break; 492 default: 493 break; 494 } 495 return 0; 496 } 497 498 static const struct hwmon_channel_info * const tmp51x_info[] = { 499 HWMON_CHANNEL_INFO(temp, 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_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_CHANNEL_INFO(in, 509 HWMON_I_INPUT | HWMON_I_LCRIT | HWMON_I_LCRIT_ALARM | 510 HWMON_I_CRIT | HWMON_I_CRIT_ALARM), 511 HWMON_CHANNEL_INFO(curr, 512 HWMON_C_INPUT | HWMON_C_LCRIT | HWMON_C_LCRIT_ALARM | 513 HWMON_C_CRIT | HWMON_C_CRIT_ALARM, 514 HWMON_C_INPUT), 515 HWMON_CHANNEL_INFO(power, 516 HWMON_P_INPUT | HWMON_P_CRIT | HWMON_P_CRIT_ALARM), 517 NULL 518 }; 519 520 static const struct hwmon_ops tmp51x_hwmon_ops = { 521 .is_visible = tmp51x_is_visible, 522 .read = tmp51x_read, 523 .write = tmp51x_write, 524 }; 525 526 static const struct hwmon_chip_info tmp51x_chip_info = { 527 .ops = &tmp51x_hwmon_ops, 528 .info = tmp51x_info, 529 }; 530 531 /* 532 * Calibrate the tmp51x following the datasheet method 533 */ 534 static int tmp51x_calibrate(struct tmp51x_data *data) 535 { 536 int vshunt_max = data->pga_gain * 40; 537 u64 max_curr_ma; 538 u32 div; 539 540 /* 541 * If shunt_uohms is equal to 0, the calibration should be set to 0. 542 * The consequence will be that the current and power measurement engine 543 * of the sensor will not work. Temperature and voltage sensing will 544 * continue to work. 545 */ 546 if (data->shunt_uohms == 0) 547 return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 0); 548 549 max_curr_ma = DIV_ROUND_CLOSEST_ULL(vshunt_max * 1000 * 1000, 550 data->shunt_uohms); 551 552 /* 553 * Calculate the minimal bit resolution for the current and the power. 554 * Those values will be used during register interpretation. 555 */ 556 data->curr_lsb_ua = DIV_ROUND_CLOSEST_ULL(max_curr_ma * 1000, 32767); 557 data->pwr_lsb_uw = 20 * data->curr_lsb_ua; 558 559 div = DIV_ROUND_CLOSEST_ULL(data->curr_lsb_ua * data->shunt_uohms, 560 1000 * 1000); 561 562 return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 563 DIV_ROUND_CLOSEST(40960, div)); 564 } 565 566 /* 567 * Initialize the configuration and calibration registers. 568 */ 569 static int tmp51x_init(struct tmp51x_data *data) 570 { 571 unsigned int regval; 572 int ret = regmap_write(data->regmap, TMP51X_SHUNT_CONFIG, 573 data->shunt_config); 574 if (ret < 0) 575 return ret; 576 577 ret = regmap_write(data->regmap, TMP51X_TEMP_CONFIG, data->temp_config); 578 if (ret < 0) 579 return ret; 580 581 // nFactor configuration 582 ret = regmap_update_bits(data->regmap, TMP51X_N_FACTOR_AND_HYST_1, 583 TMP51X_NFACTOR_MASK, data->nfactor[0] << 8); 584 if (ret < 0) 585 return ret; 586 587 ret = regmap_write(data->regmap, TMP51X_N_FACTOR_2, 588 data->nfactor[1] << 8); 589 if (ret < 0) 590 return ret; 591 592 if (data->max_channels == TMP513_MAX_CHANNELS) { 593 ret = regmap_write(data->regmap, TMP513_N_FACTOR_3, 594 data->nfactor[2] << 8); 595 if (ret < 0) 596 return ret; 597 } 598 599 ret = tmp51x_calibrate(data); 600 if (ret < 0) 601 return ret; 602 603 // Read the status register before using as the datasheet propose 604 return regmap_read(data->regmap, TMP51X_STATUS, ®val); 605 } 606 607 static const struct i2c_device_id tmp51x_id[] = { 608 { "tmp512", TMP512_MAX_CHANNELS }, 609 { "tmp513", TMP513_MAX_CHANNELS }, 610 { } 611 }; 612 MODULE_DEVICE_TABLE(i2c, tmp51x_id); 613 614 static const struct of_device_id tmp51x_of_match[] = { 615 { .compatible = "ti,tmp512", .data = (void *)TMP512_MAX_CHANNELS }, 616 { .compatible = "ti,tmp513", .data = (void *)TMP513_MAX_CHANNELS }, 617 { } 618 }; 619 MODULE_DEVICE_TABLE(of, tmp51x_of_match); 620 621 static int tmp51x_vbus_range_to_reg(struct device *dev, 622 struct tmp51x_data *data) 623 { 624 if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) { 625 data->shunt_config |= TMP51X_BUS_VOLTAGE_MASK; 626 } else if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_16V) { 627 data->shunt_config &= ~TMP51X_BUS_VOLTAGE_MASK; 628 } else { 629 dev_err(dev, "ti,bus-range-microvolt is invalid: %u\n", 630 data->vbus_range_uvolt); 631 return -EINVAL; 632 } 633 return 0; 634 } 635 636 static int tmp51x_pga_gain_to_reg(struct device *dev, struct tmp51x_data *data) 637 { 638 if (data->pga_gain == 8) { 639 data->shunt_config |= CURRENT_SENSE_VOLTAGE_320_MASK; 640 } else if (data->pga_gain == 4) { 641 data->shunt_config |= CURRENT_SENSE_VOLTAGE_160_MASK; 642 } else if (data->pga_gain == 2) { 643 data->shunt_config |= CURRENT_SENSE_VOLTAGE_80_MASK; 644 } else if (data->pga_gain == 1) { 645 data->shunt_config |= CURRENT_SENSE_VOLTAGE_40_MASK; 646 } else { 647 dev_err(dev, "ti,pga-gain is invalid: %u\n", data->pga_gain); 648 return -EINVAL; 649 } 650 return 0; 651 } 652 653 static int tmp51x_read_properties(struct device *dev, struct tmp51x_data *data) 654 { 655 int ret; 656 u32 val; 657 658 ret = device_property_read_u32(dev, "shunt-resistor-micro-ohms", &val); 659 data->shunt_uohms = (ret >= 0) ? val : TMP51X_SHUNT_VALUE_DEFAULT; 660 661 ret = device_property_read_u32(dev, "ti,bus-range-microvolt", &val); 662 data->vbus_range_uvolt = (ret >= 0) ? val : TMP51X_VBUS_RANGE_DEFAULT; 663 ret = tmp51x_vbus_range_to_reg(dev, data); 664 if (ret < 0) 665 return ret; 666 667 ret = device_property_read_u32(dev, "ti,pga-gain", &val); 668 data->pga_gain = (ret >= 0) ? val : TMP51X_PGA_DEFAULT; 669 ret = tmp51x_pga_gain_to_reg(dev, data); 670 if (ret < 0) 671 return ret; 672 673 device_property_read_u32_array(dev, "ti,nfactor", data->nfactor, 674 data->max_channels - 1); 675 676 // Check if shunt value is compatible with pga-gain 677 if (data->shunt_uohms > data->pga_gain * 40 * 1000 * 1000) { 678 dev_err(dev, "shunt-resistor: %u too big for pga_gain: %u\n", 679 data->shunt_uohms, data->pga_gain); 680 return -EINVAL; 681 } 682 683 return 0; 684 } 685 686 static void tmp51x_use_default(struct tmp51x_data *data) 687 { 688 data->vbus_range_uvolt = TMP51X_VBUS_RANGE_DEFAULT; 689 data->pga_gain = TMP51X_PGA_DEFAULT; 690 data->shunt_uohms = TMP51X_SHUNT_VALUE_DEFAULT; 691 } 692 693 static int tmp51x_configure(struct device *dev, struct tmp51x_data *data) 694 { 695 data->shunt_config = TMP51X_SHUNT_CONFIG_DEFAULT; 696 data->temp_config = TMP51X_TEMP_CONFIG_DEFAULT(data->max_channels); 697 698 if (dev->of_node) 699 return tmp51x_read_properties(dev, data); 700 701 tmp51x_use_default(data); 702 703 return 0; 704 } 705 706 static int tmp51x_probe(struct i2c_client *client) 707 { 708 struct device *dev = &client->dev; 709 struct tmp51x_data *data; 710 struct device *hwmon_dev; 711 int ret; 712 713 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 714 if (!data) 715 return -ENOMEM; 716 717 data->max_channels = (uintptr_t)i2c_get_match_data(client); 718 719 ret = tmp51x_configure(dev, data); 720 if (ret < 0) { 721 dev_err(dev, "error configuring the device: %d\n", ret); 722 return ret; 723 } 724 725 data->regmap = devm_regmap_init_i2c(client, &tmp51x_regmap_config); 726 if (IS_ERR(data->regmap)) { 727 dev_err(dev, "failed to allocate register map\n"); 728 return PTR_ERR(data->regmap); 729 } 730 731 ret = tmp51x_init(data); 732 if (ret < 0) { 733 dev_err(dev, "error configuring the device: %d\n", ret); 734 return -ENODEV; 735 } 736 737 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, 738 data, 739 &tmp51x_chip_info, 740 NULL); 741 if (IS_ERR(hwmon_dev)) 742 return PTR_ERR(hwmon_dev); 743 744 dev_dbg(dev, "power monitor %s\n", client->name); 745 746 return 0; 747 } 748 749 static struct i2c_driver tmp51x_driver = { 750 .driver = { 751 .name = "tmp51x", 752 .of_match_table = tmp51x_of_match, 753 }, 754 .probe = tmp51x_probe, 755 .id_table = tmp51x_id, 756 }; 757 758 module_i2c_driver(tmp51x_driver); 759 760 MODULE_AUTHOR("Eric Tremblay <etremblay@distechcontrols.com>"); 761 MODULE_DESCRIPTION("tmp51x driver"); 762 MODULE_LICENSE("GPL"); 763