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=4, 4=3, 2=2, 1=1 186 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, 17 - tmp51x_get_pga_shift(data)); 208 *val = DIV_ROUND_CLOSEST(*val * 10 * MILLI, data->shunt_uohms); 209 break; 210 case TMP51X_BUS_VOLTAGE_RESULT: 211 case TMP51X_BUS_VOLTAGE_H_LIMIT: 212 case TMP51X_BUS_VOLTAGE_L_LIMIT: 213 // 1lsb = 4mV 214 *val = (regval >> TMP51X_BUS_VOLTAGE_SHIFT) * 4; 215 break; 216 case TMP51X_POWER_RESULT: 217 case TMP51X_POWER_LIMIT: 218 // Power = (current * BusVoltage) / 5000 219 *val = regval * data->pwr_lsb_uw; 220 break; 221 case TMP51X_BUS_CURRENT_RESULT: 222 // Current = (ShuntVoltage * CalibrationRegister) / 4096 223 *val = sign_extend32(regval, 16) * data->curr_lsb_ua; 224 *val = DIV_ROUND_CLOSEST(*val, MILLI); 225 break; 226 case TMP51X_LOCAL_TEMP_RESULT: 227 case TMP51X_REMOTE_TEMP_RESULT_1: 228 case TMP51X_REMOTE_TEMP_RESULT_2: 229 case TMP513_REMOTE_TEMP_RESULT_3: 230 case TMP51X_LOCAL_TEMP_LIMIT: 231 case TMP51X_REMOTE_TEMP_LIMIT_1: 232 case TMP51X_REMOTE_TEMP_LIMIT_2: 233 case TMP513_REMOTE_TEMP_LIMIT_3: 234 // 1lsb = 0.0625 degrees centigrade 235 *val = sign_extend32(regval, 16) >> TMP51X_TEMP_SHIFT; 236 *val = DIV_ROUND_CLOSEST(*val * 625, 10); 237 break; 238 case TMP51X_N_FACTOR_AND_HYST_1: 239 // 1lsb = 0.5 degrees centigrade 240 *val = (regval & TMP51X_HYST_MASK) * 500; 241 break; 242 default: 243 // Programmer goofed 244 WARN_ON_ONCE(1); 245 *val = 0; 246 return -EOPNOTSUPP; 247 } 248 249 return 0; 250 } 251 252 static int tmp51x_set_value(struct tmp51x_data *data, u8 reg, long val) 253 { 254 int regval, max_val; 255 u32 mask = 0; 256 257 switch (reg) { 258 case TMP51X_SHUNT_CURRENT_H_LIMIT: 259 case TMP51X_SHUNT_CURRENT_L_LIMIT: 260 /* 261 * The user enter current value and we convert it to 262 * voltage. 1lsb = 10uV 263 */ 264 val = DIV_ROUND_CLOSEST(val * data->shunt_uohms, 10 * MILLI); 265 max_val = U16_MAX >> tmp51x_get_pga_shift(data); 266 regval = clamp_val(val, -max_val, max_val); 267 break; 268 case TMP51X_BUS_VOLTAGE_H_LIMIT: 269 case TMP51X_BUS_VOLTAGE_L_LIMIT: 270 // 1lsb = 4mV 271 max_val = (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) ? 272 MAX_BUS_VOLTAGE_32_LIMIT : MAX_BUS_VOLTAGE_16_LIMIT; 273 274 val = clamp_val(DIV_ROUND_CLOSEST(val, 4), 0, max_val); 275 regval = val << TMP51X_BUS_VOLTAGE_SHIFT; 276 break; 277 case TMP51X_POWER_LIMIT: 278 regval = clamp_val(DIV_ROUND_CLOSEST(val, data->pwr_lsb_uw), 0, 279 U16_MAX); 280 break; 281 case TMP51X_LOCAL_TEMP_LIMIT: 282 case TMP51X_REMOTE_TEMP_LIMIT_1: 283 case TMP51X_REMOTE_TEMP_LIMIT_2: 284 case TMP513_REMOTE_TEMP_LIMIT_3: 285 // 1lsb = 0.0625 degrees centigrade 286 val = clamp_val(val, MIN_TEMP_LIMIT, MAX_TEMP_LIMIT); 287 regval = DIV_ROUND_CLOSEST(val * 10, 625) << TMP51X_TEMP_SHIFT; 288 break; 289 case TMP51X_N_FACTOR_AND_HYST_1: 290 // 1lsb = 0.5 degrees centigrade 291 val = clamp_val(val, 0, MAX_TEMP_HYST); 292 regval = DIV_ROUND_CLOSEST(val, 500); 293 mask = TMP51X_HYST_MASK; 294 break; 295 default: 296 // Programmer goofed 297 WARN_ON_ONCE(1); 298 return -EOPNOTSUPP; 299 } 300 301 if (mask == 0) 302 return regmap_write(data->regmap, reg, regval); 303 else 304 return regmap_update_bits(data->regmap, reg, mask, regval); 305 } 306 307 static u8 tmp51x_get_reg(enum hwmon_sensor_types type, u32 attr, int channel) 308 { 309 switch (type) { 310 case hwmon_temp: 311 switch (attr) { 312 case hwmon_temp_input: 313 return TMP51X_TEMP_INPUT[channel]; 314 case hwmon_temp_crit_alarm: 315 return TMP51X_STATUS; 316 case hwmon_temp_crit: 317 return TMP51X_TEMP_CRIT[channel]; 318 case hwmon_temp_crit_hyst: 319 return TMP51X_TEMP_CRIT_HYST[channel]; 320 } 321 break; 322 case hwmon_in: 323 switch (attr) { 324 case hwmon_in_input: 325 return TMP51X_BUS_VOLTAGE_RESULT; 326 case hwmon_in_lcrit_alarm: 327 case hwmon_in_crit_alarm: 328 return TMP51X_STATUS; 329 case hwmon_in_lcrit: 330 return TMP51X_BUS_VOLTAGE_L_LIMIT; 331 case hwmon_in_crit: 332 return TMP51X_BUS_VOLTAGE_H_LIMIT; 333 } 334 break; 335 case hwmon_curr: 336 switch (attr) { 337 case hwmon_curr_input: 338 return TMP51X_CURR_INPUT[channel]; 339 case hwmon_curr_lcrit_alarm: 340 case hwmon_curr_crit_alarm: 341 return TMP51X_STATUS; 342 case hwmon_curr_lcrit: 343 return TMP51X_SHUNT_CURRENT_L_LIMIT; 344 case hwmon_curr_crit: 345 return TMP51X_SHUNT_CURRENT_H_LIMIT; 346 } 347 break; 348 case hwmon_power: 349 switch (attr) { 350 case hwmon_power_input: 351 return TMP51X_POWER_RESULT; 352 case hwmon_power_crit_alarm: 353 return TMP51X_STATUS; 354 case hwmon_power_crit: 355 return TMP51X_POWER_LIMIT; 356 } 357 break; 358 default: 359 break; 360 } 361 362 return 0; 363 } 364 365 static u8 tmp51x_get_status_pos(enum hwmon_sensor_types type, u32 attr, 366 int channel) 367 { 368 switch (type) { 369 case hwmon_temp: 370 switch (attr) { 371 case hwmon_temp_crit_alarm: 372 return TMP51X_TEMP_CRIT_ALARM[channel]; 373 } 374 break; 375 case hwmon_in: 376 switch (attr) { 377 case hwmon_in_lcrit_alarm: 378 return TMP51X_BUS_VOLTAGE_L_LIMIT_POS; 379 case hwmon_in_crit_alarm: 380 return TMP51X_BUS_VOLTAGE_H_LIMIT_POS; 381 } 382 break; 383 case hwmon_curr: 384 switch (attr) { 385 case hwmon_curr_lcrit_alarm: 386 return TMP51X_SHUNT_CURRENT_L_LIMIT_POS; 387 case hwmon_curr_crit_alarm: 388 return TMP51X_SHUNT_CURRENT_H_LIMIT_POS; 389 } 390 break; 391 case hwmon_power: 392 switch (attr) { 393 case hwmon_power_crit_alarm: 394 return TMP51X_POWER_LIMIT_POS; 395 } 396 break; 397 default: 398 break; 399 } 400 401 return 0; 402 } 403 404 static int tmp51x_read(struct device *dev, enum hwmon_sensor_types type, 405 u32 attr, int channel, long *val) 406 { 407 struct tmp51x_data *data = dev_get_drvdata(dev); 408 int ret; 409 u32 regval; 410 u8 pos = 0, reg = 0; 411 412 reg = tmp51x_get_reg(type, attr, channel); 413 if (reg == 0) 414 return -EOPNOTSUPP; 415 416 if (reg == TMP51X_STATUS) 417 pos = tmp51x_get_status_pos(type, attr, channel); 418 419 ret = regmap_read(data->regmap, reg, ®val); 420 if (ret < 0) 421 return ret; 422 423 return tmp51x_get_value(data, reg, pos, regval, val); 424 } 425 426 static int tmp51x_write(struct device *dev, enum hwmon_sensor_types type, 427 u32 attr, int channel, long val) 428 { 429 u8 reg = 0; 430 431 reg = tmp51x_get_reg(type, attr, channel); 432 if (reg == 0) 433 return -EOPNOTSUPP; 434 435 return tmp51x_set_value(dev_get_drvdata(dev), reg, val); 436 } 437 438 static umode_t tmp51x_is_visible(const void *_data, 439 enum hwmon_sensor_types type, u32 attr, 440 int channel) 441 { 442 const struct tmp51x_data *data = _data; 443 444 switch (type) { 445 case hwmon_temp: 446 if (channel >= data->max_channels) 447 return 0; 448 switch (attr) { 449 case hwmon_temp_input: 450 case hwmon_temp_crit_alarm: 451 return 0444; 452 case hwmon_temp_crit: 453 return 0644; 454 case hwmon_temp_crit_hyst: 455 if (channel == 0) 456 return 0644; 457 return 0444; 458 } 459 break; 460 case hwmon_in: 461 switch (attr) { 462 case hwmon_in_input: 463 case hwmon_in_lcrit_alarm: 464 case hwmon_in_crit_alarm: 465 return 0444; 466 case hwmon_in_lcrit: 467 case hwmon_in_crit: 468 return 0644; 469 } 470 break; 471 case hwmon_curr: 472 if (!data->shunt_uohms) 473 return 0; 474 475 switch (attr) { 476 case hwmon_curr_input: 477 case hwmon_curr_lcrit_alarm: 478 case hwmon_curr_crit_alarm: 479 return 0444; 480 case hwmon_curr_lcrit: 481 case hwmon_curr_crit: 482 return 0644; 483 } 484 break; 485 case hwmon_power: 486 if (!data->shunt_uohms) 487 return 0; 488 489 switch (attr) { 490 case hwmon_power_input: 491 case hwmon_power_crit_alarm: 492 return 0444; 493 case hwmon_power_crit: 494 return 0644; 495 } 496 break; 497 default: 498 break; 499 } 500 return 0; 501 } 502 503 static const struct hwmon_channel_info * const tmp51x_info[] = { 504 HWMON_CHANNEL_INFO(temp, 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_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | 512 HWMON_T_CRIT_HYST), 513 HWMON_CHANNEL_INFO(in, 514 HWMON_I_INPUT | HWMON_I_LCRIT | HWMON_I_LCRIT_ALARM | 515 HWMON_I_CRIT | HWMON_I_CRIT_ALARM), 516 HWMON_CHANNEL_INFO(curr, 517 HWMON_C_INPUT | HWMON_C_LCRIT | HWMON_C_LCRIT_ALARM | 518 HWMON_C_CRIT | HWMON_C_CRIT_ALARM, 519 HWMON_C_INPUT), 520 HWMON_CHANNEL_INFO(power, 521 HWMON_P_INPUT | HWMON_P_CRIT | HWMON_P_CRIT_ALARM), 522 NULL 523 }; 524 525 static const struct hwmon_ops tmp51x_hwmon_ops = { 526 .is_visible = tmp51x_is_visible, 527 .read = tmp51x_read, 528 .write = tmp51x_write, 529 }; 530 531 static const struct hwmon_chip_info tmp51x_chip_info = { 532 .ops = &tmp51x_hwmon_ops, 533 .info = tmp51x_info, 534 }; 535 536 /* 537 * Calibrate the tmp51x following the datasheet method 538 */ 539 static int tmp51x_calibrate(struct tmp51x_data *data) 540 { 541 int vshunt_max = data->pga_gain * 40; 542 u64 max_curr_ma; 543 u32 div; 544 545 /* 546 * If shunt_uohms is equal to 0, the calibration should be set to 0. 547 * The consequence will be that the current and power measurement engine 548 * of the sensor will not work. Temperature and voltage sensing will 549 * continue to work. 550 */ 551 if (data->shunt_uohms == 0) 552 return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 0); 553 554 max_curr_ma = DIV_ROUND_CLOSEST_ULL(vshunt_max * MICRO, data->shunt_uohms); 555 556 /* 557 * Calculate the minimal bit resolution for the current and the power. 558 * Those values will be used during register interpretation. 559 */ 560 data->curr_lsb_ua = DIV_ROUND_CLOSEST_ULL(max_curr_ma * MILLI, 32767); 561 data->pwr_lsb_uw = 20 * data->curr_lsb_ua; 562 563 div = DIV_ROUND_CLOSEST_ULL(data->curr_lsb_ua * data->shunt_uohms, MICRO); 564 565 return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 566 DIV_ROUND_CLOSEST(40960, div)); 567 } 568 569 /* 570 * Initialize the configuration and calibration registers. 571 */ 572 static int tmp51x_init(struct tmp51x_data *data) 573 { 574 unsigned int regval; 575 int ret = regmap_write(data->regmap, TMP51X_SHUNT_CONFIG, 576 data->shunt_config); 577 if (ret < 0) 578 return ret; 579 580 ret = regmap_write(data->regmap, TMP51X_TEMP_CONFIG, data->temp_config); 581 if (ret < 0) 582 return ret; 583 584 // nFactor configuration 585 ret = regmap_update_bits(data->regmap, TMP51X_N_FACTOR_AND_HYST_1, 586 TMP51X_NFACTOR_MASK, data->nfactor[0] << 8); 587 if (ret < 0) 588 return ret; 589 590 ret = regmap_write(data->regmap, TMP51X_N_FACTOR_2, 591 data->nfactor[1] << 8); 592 if (ret < 0) 593 return ret; 594 595 if (data->max_channels == TMP513_MAX_CHANNELS) { 596 ret = regmap_write(data->regmap, TMP513_N_FACTOR_3, 597 data->nfactor[2] << 8); 598 if (ret < 0) 599 return ret; 600 } 601 602 ret = tmp51x_calibrate(data); 603 if (ret < 0) 604 return ret; 605 606 // Read the status register before using as the datasheet propose 607 return regmap_read(data->regmap, TMP51X_STATUS, ®val); 608 } 609 610 static const struct i2c_device_id tmp51x_id[] = { 611 { "tmp512", TMP512_MAX_CHANNELS }, 612 { "tmp513", TMP513_MAX_CHANNELS }, 613 { } 614 }; 615 MODULE_DEVICE_TABLE(i2c, tmp51x_id); 616 617 static const struct of_device_id tmp51x_of_match[] = { 618 { .compatible = "ti,tmp512", .data = (void *)TMP512_MAX_CHANNELS }, 619 { .compatible = "ti,tmp513", .data = (void *)TMP513_MAX_CHANNELS }, 620 { } 621 }; 622 MODULE_DEVICE_TABLE(of, tmp51x_of_match); 623 624 static int tmp51x_vbus_range_to_reg(struct device *dev, 625 struct tmp51x_data *data) 626 { 627 if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) { 628 data->shunt_config |= TMP51X_BUS_VOLTAGE_MASK; 629 } else if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_16V) { 630 data->shunt_config &= ~TMP51X_BUS_VOLTAGE_MASK; 631 } else { 632 return dev_err_probe(dev, -EINVAL, 633 "ti,bus-range-microvolt is invalid: %u\n", 634 data->vbus_range_uvolt); 635 } 636 return 0; 637 } 638 639 static int tmp51x_pga_gain_to_reg(struct device *dev, struct tmp51x_data *data) 640 { 641 if (data->pga_gain == 8) { 642 data->shunt_config |= CURRENT_SENSE_VOLTAGE_320_MASK; 643 } else if (data->pga_gain == 4) { 644 data->shunt_config |= CURRENT_SENSE_VOLTAGE_160_MASK; 645 } else if (data->pga_gain == 2) { 646 data->shunt_config |= CURRENT_SENSE_VOLTAGE_80_MASK; 647 } else if (data->pga_gain == 1) { 648 data->shunt_config |= CURRENT_SENSE_VOLTAGE_40_MASK; 649 } else { 650 return dev_err_probe(dev, -EINVAL, 651 "ti,pga-gain is invalid: %u\n", data->pga_gain); 652 } 653 return 0; 654 } 655 656 static int tmp51x_read_properties(struct device *dev, struct tmp51x_data *data) 657 { 658 int ret; 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 device_property_read_u32_array(dev, "ti,nfactor", data->nfactor, 677 data->max_channels - 1); 678 679 // Check if shunt value is compatible with pga-gain 680 if (data->shunt_uohms > data->pga_gain * 40 * MICRO) { 681 return dev_err_probe(dev, -EINVAL, 682 "shunt-resistor: %u too big for pga_gain: %u\n", 683 data->shunt_uohms, data->pga_gain); 684 } 685 686 return 0; 687 } 688 689 static void tmp51x_use_default(struct tmp51x_data *data) 690 { 691 data->vbus_range_uvolt = TMP51X_VBUS_RANGE_DEFAULT; 692 data->pga_gain = TMP51X_PGA_DEFAULT; 693 data->shunt_uohms = TMP51X_SHUNT_VALUE_DEFAULT; 694 } 695 696 static int tmp51x_configure(struct device *dev, struct tmp51x_data *data) 697 { 698 data->shunt_config = TMP51X_SHUNT_CONFIG_DEFAULT; 699 data->temp_config = TMP51X_TEMP_CONFIG_DEFAULT(data->max_channels); 700 701 if (dev->of_node) 702 return tmp51x_read_properties(dev, data); 703 704 tmp51x_use_default(data); 705 706 return 0; 707 } 708 709 static int tmp51x_probe(struct i2c_client *client) 710 { 711 struct device *dev = &client->dev; 712 struct tmp51x_data *data; 713 struct device *hwmon_dev; 714 int ret; 715 716 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 717 if (!data) 718 return -ENOMEM; 719 720 data->max_channels = (uintptr_t)i2c_get_match_data(client); 721 722 ret = tmp51x_configure(dev, data); 723 if (ret < 0) 724 return dev_err_probe(dev, ret, "error configuring the device\n"); 725 726 data->regmap = devm_regmap_init_i2c(client, &tmp51x_regmap_config); 727 if (IS_ERR(data->regmap)) 728 return dev_err_probe(dev, PTR_ERR(data->regmap), 729 "failed to allocate register map\n"); 730 731 ret = tmp51x_init(data); 732 if (ret < 0) 733 return dev_err_probe(dev, ret, "error configuring the device\n"); 734 735 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, 736 data, 737 &tmp51x_chip_info, 738 NULL); 739 if (IS_ERR(hwmon_dev)) 740 return PTR_ERR(hwmon_dev); 741 742 dev_dbg(dev, "power monitor %s\n", client->name); 743 744 return 0; 745 } 746 747 static struct i2c_driver tmp51x_driver = { 748 .driver = { 749 .name = "tmp51x", 750 .of_match_table = tmp51x_of_match, 751 }, 752 .probe = tmp51x_probe, 753 .id_table = tmp51x_id, 754 }; 755 756 module_i2c_driver(tmp51x_driver); 757 758 MODULE_AUTHOR("Eric Tremblay <etremblay@distechcontrols.com>"); 759 MODULE_DESCRIPTION("tmp51x driver"); 760 MODULE_LICENSE("GPL"); 761