1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * INA3221 Triple Current/Voltage Monitor 4 * 5 * Copyright (C) 2016 Texas Instruments Incorporated - https://www.ti.com/ 6 * Andrew F. Davis <afd@ti.com> 7 */ 8 9 #include <linux/debugfs.h> 10 #include <linux/hwmon.h> 11 #include <linux/hwmon-sysfs.h> 12 #include <linux/i2c.h> 13 #include <linux/module.h> 14 #include <linux/mutex.h> 15 #include <linux/of.h> 16 #include <linux/pm_runtime.h> 17 #include <linux/regmap.h> 18 #include <linux/util_macros.h> 19 20 #define INA3221_DRIVER_NAME "ina3221" 21 22 #define INA3221_CONFIG 0x00 23 #define INA3221_SHUNT1 0x01 24 #define INA3221_BUS1 0x02 25 #define INA3221_SHUNT2 0x03 26 #define INA3221_BUS2 0x04 27 #define INA3221_SHUNT3 0x05 28 #define INA3221_BUS3 0x06 29 #define INA3221_CRIT1 0x07 30 #define INA3221_WARN1 0x08 31 #define INA3221_CRIT2 0x09 32 #define INA3221_WARN2 0x0a 33 #define INA3221_CRIT3 0x0b 34 #define INA3221_WARN3 0x0c 35 #define INA3221_SHUNT_SUM 0x0d 36 #define INA3221_CRIT_SUM 0x0e 37 #define INA3221_MASK_ENABLE 0x0f 38 39 #define INA3221_CONFIG_MODE_MASK GENMASK(2, 0) 40 #define INA3221_CONFIG_MODE_POWERDOWN 0 41 #define INA3221_CONFIG_MODE_SHUNT BIT(0) 42 #define INA3221_CONFIG_MODE_BUS BIT(1) 43 #define INA3221_CONFIG_MODE_CONTINUOUS BIT(2) 44 #define INA3221_CONFIG_VSH_CT_SHIFT 3 45 #define INA3221_CONFIG_VSH_CT_MASK GENMASK(5, 3) 46 #define INA3221_CONFIG_VSH_CT(x) (((x) & GENMASK(5, 3)) >> 3) 47 #define INA3221_CONFIG_VBUS_CT_SHIFT 6 48 #define INA3221_CONFIG_VBUS_CT_MASK GENMASK(8, 6) 49 #define INA3221_CONFIG_VBUS_CT(x) (((x) & GENMASK(8, 6)) >> 6) 50 #define INA3221_CONFIG_AVG_SHIFT 9 51 #define INA3221_CONFIG_AVG_MASK GENMASK(11, 9) 52 #define INA3221_CONFIG_AVG(x) (((x) & GENMASK(11, 9)) >> 9) 53 #define INA3221_CONFIG_CHs_EN_MASK GENMASK(14, 12) 54 #define INA3221_CONFIG_CHx_EN(x) BIT(14 - (x)) 55 56 #define INA3221_MASK_ENABLE_SCC_MASK GENMASK(14, 12) 57 58 #define INA3221_CONFIG_DEFAULT 0x7127 59 #define INA3221_RSHUNT_DEFAULT 10000 60 61 enum ina3221_fields { 62 /* Configuration */ 63 F_RST, 64 65 /* Status Flags */ 66 F_CVRF, 67 68 /* Warning Flags */ 69 F_WF3, F_WF2, F_WF1, 70 71 /* Alert Flags: SF is the summation-alert flag */ 72 F_SF, F_CF3, F_CF2, F_CF1, 73 74 /* sentinel */ 75 F_MAX_FIELDS 76 }; 77 78 static const struct reg_field ina3221_reg_fields[] = { 79 [F_RST] = REG_FIELD(INA3221_CONFIG, 15, 15), 80 81 [F_CVRF] = REG_FIELD(INA3221_MASK_ENABLE, 0, 0), 82 [F_WF3] = REG_FIELD(INA3221_MASK_ENABLE, 3, 3), 83 [F_WF2] = REG_FIELD(INA3221_MASK_ENABLE, 4, 4), 84 [F_WF1] = REG_FIELD(INA3221_MASK_ENABLE, 5, 5), 85 [F_SF] = REG_FIELD(INA3221_MASK_ENABLE, 6, 6), 86 [F_CF3] = REG_FIELD(INA3221_MASK_ENABLE, 7, 7), 87 [F_CF2] = REG_FIELD(INA3221_MASK_ENABLE, 8, 8), 88 [F_CF1] = REG_FIELD(INA3221_MASK_ENABLE, 9, 9), 89 }; 90 91 enum ina3221_channels { 92 INA3221_CHANNEL1, 93 INA3221_CHANNEL2, 94 INA3221_CHANNEL3, 95 INA3221_NUM_CHANNELS 96 }; 97 98 /** 99 * struct ina3221_input - channel input source specific information 100 * @label: label of channel input source 101 * @shunt_resistor: shunt resistor value of channel input source 102 * @disconnected: connection status of channel input source 103 * @summation_disable: channel summation status of input source 104 */ 105 struct ina3221_input { 106 const char *label; 107 int shunt_resistor; 108 bool disconnected; 109 bool summation_disable; 110 }; 111 112 /** 113 * struct ina3221_data - device specific information 114 * @pm_dev: Device pointer for pm runtime 115 * @regmap: Register map of the device 116 * @fields: Register fields of the device 117 * @inputs: Array of channel input source specific structures 118 * @lock: mutex lock to serialize sysfs attribute accesses 119 * @debugfs: Pointer to debugfs entry for device 120 * @reg_config: Register value of INA3221_CONFIG 121 * @summation_shunt_resistor: equivalent shunt resistor value for summation 122 * @summation_channel_control: Value written to SCC field in INA3221_MASK_ENABLE 123 * @single_shot: running in single-shot operating mode 124 */ 125 struct ina3221_data { 126 struct device *pm_dev; 127 struct regmap *regmap; 128 struct regmap_field *fields[F_MAX_FIELDS]; 129 struct ina3221_input inputs[INA3221_NUM_CHANNELS]; 130 struct mutex lock; 131 struct dentry *debugfs; 132 u32 reg_config; 133 int summation_shunt_resistor; 134 u32 summation_channel_control; 135 136 bool single_shot; 137 }; 138 139 static inline bool ina3221_is_enabled(struct ina3221_data *ina, int channel) 140 { 141 /* Summation channel checks shunt resistor values */ 142 if (channel > INA3221_CHANNEL3) 143 return ina->summation_shunt_resistor != 0; 144 145 return pm_runtime_active(ina->pm_dev) && 146 (ina->reg_config & INA3221_CONFIG_CHx_EN(channel)); 147 } 148 149 /* 150 * Helper function to return the resistor value for current summation. 151 * 152 * There is a condition to calculate current summation -- all the shunt 153 * resistor values should be the same, so as to simply fit the formula: 154 * current summation = shunt voltage summation / shunt resistor 155 * 156 * Returns the equivalent shunt resistor value on success or 0 on failure 157 */ 158 static inline int ina3221_summation_shunt_resistor(struct ina3221_data *ina) 159 { 160 struct ina3221_input *input = ina->inputs; 161 int i, shunt_resistor = 0; 162 163 for (i = 0; i < INA3221_NUM_CHANNELS; i++) { 164 if (input[i].disconnected || !input[i].shunt_resistor || 165 input[i].summation_disable) 166 continue; 167 if (!shunt_resistor) { 168 /* Found the reference shunt resistor value */ 169 shunt_resistor = input[i].shunt_resistor; 170 } else { 171 /* No summation if resistor values are different */ 172 if (shunt_resistor != input[i].shunt_resistor) 173 return 0; 174 } 175 } 176 177 return shunt_resistor; 178 } 179 180 /* Lookup table for Bus and Shunt conversion times in usec */ 181 static const u16 ina3221_conv_time[] = { 182 140, 204, 332, 588, 1100, 2116, 4156, 8244, 183 }; 184 185 /* Lookup table for number of samples using in averaging mode */ 186 static const int ina3221_avg_samples[] = { 187 1, 4, 16, 64, 128, 256, 512, 1024, 188 }; 189 190 /* Converting update_interval in msec to conversion time in usec */ 191 static inline u32 ina3221_interval_ms_to_conv_time(u16 config, int interval) 192 { 193 u32 channels = hweight16(config & INA3221_CONFIG_CHs_EN_MASK); 194 u32 samples_idx = INA3221_CONFIG_AVG(config); 195 u32 samples = ina3221_avg_samples[samples_idx]; 196 197 /* Bisect the result to Bus and Shunt conversion times */ 198 return DIV_ROUND_CLOSEST(interval * 1000 / 2, channels * samples); 199 } 200 201 /* Converting CONFIG register value to update_interval in usec */ 202 static inline u32 ina3221_reg_to_interval_us(u16 config) 203 { 204 u32 channels = hweight16(config & INA3221_CONFIG_CHs_EN_MASK); 205 u32 vbus_ct_idx = INA3221_CONFIG_VBUS_CT(config); 206 u32 vsh_ct_idx = INA3221_CONFIG_VSH_CT(config); 207 u32 vbus_ct = ina3221_conv_time[vbus_ct_idx]; 208 u32 vsh_ct = ina3221_conv_time[vsh_ct_idx]; 209 210 /* Calculate total conversion time */ 211 return channels * (vbus_ct + vsh_ct); 212 } 213 214 static inline int ina3221_wait_for_data(struct ina3221_data *ina) 215 { 216 u32 wait, cvrf; 217 218 wait = ina3221_reg_to_interval_us(ina->reg_config); 219 220 /* Polling the CVRF bit to make sure read data is ready */ 221 return regmap_field_read_poll_timeout(ina->fields[F_CVRF], 222 cvrf, cvrf, wait, wait * 2); 223 } 224 225 static int ina3221_read_value(struct ina3221_data *ina, unsigned int reg, 226 int *val) 227 { 228 unsigned int regval; 229 int ret; 230 231 ret = regmap_read(ina->regmap, reg, ®val); 232 if (ret) 233 return ret; 234 235 /* 236 * Shunt Voltage Sum register has 14-bit value with 1-bit shift 237 * Other Shunt Voltage registers have 12 bits with 3-bit shift 238 */ 239 if (reg == INA3221_SHUNT_SUM || reg == INA3221_CRIT_SUM) 240 *val = sign_extend32(regval >> 1, 14); 241 else 242 *val = sign_extend32(regval >> 3, 12); 243 244 return 0; 245 } 246 247 static const u8 ina3221_in_reg[] = { 248 INA3221_BUS1, 249 INA3221_BUS2, 250 INA3221_BUS3, 251 INA3221_SHUNT1, 252 INA3221_SHUNT2, 253 INA3221_SHUNT3, 254 INA3221_SHUNT_SUM, 255 }; 256 257 static int ina3221_read_chip(struct device *dev, u32 attr, long *val) 258 { 259 struct ina3221_data *ina = dev_get_drvdata(dev); 260 int regval; 261 262 switch (attr) { 263 case hwmon_chip_samples: 264 regval = INA3221_CONFIG_AVG(ina->reg_config); 265 *val = ina3221_avg_samples[regval]; 266 return 0; 267 case hwmon_chip_update_interval: 268 /* Return in msec */ 269 *val = ina3221_reg_to_interval_us(ina->reg_config); 270 *val = DIV_ROUND_CLOSEST(*val, 1000); 271 return 0; 272 default: 273 return -EOPNOTSUPP; 274 } 275 } 276 277 static int ina3221_read_in(struct device *dev, u32 attr, int channel, long *val) 278 { 279 const bool is_shunt = channel > INA3221_CHANNEL3; 280 struct ina3221_data *ina = dev_get_drvdata(dev); 281 u8 reg = ina3221_in_reg[channel]; 282 int regval, ret; 283 284 /* 285 * Translate shunt channel index to sensor channel index except 286 * the 7th channel (6 since being 0-aligned) is for summation. 287 */ 288 if (channel != 6) 289 channel %= INA3221_NUM_CHANNELS; 290 291 switch (attr) { 292 case hwmon_in_input: 293 if (!ina3221_is_enabled(ina, channel)) 294 return -ENODATA; 295 296 /* Write CONFIG register to trigger a single-shot measurement */ 297 if (ina->single_shot) { 298 regmap_write(ina->regmap, INA3221_CONFIG, 299 ina->reg_config); 300 301 ret = ina3221_wait_for_data(ina); 302 if (ret) 303 return ret; 304 } 305 306 ret = ina3221_read_value(ina, reg, ®val); 307 if (ret) 308 return ret; 309 310 /* 311 * Scale of shunt voltage (uV): LSB is 40uV 312 * Scale of bus voltage (mV): LSB is 8mV 313 */ 314 *val = regval * (is_shunt ? 40 : 8); 315 return 0; 316 case hwmon_in_enable: 317 *val = ina3221_is_enabled(ina, channel); 318 return 0; 319 default: 320 return -EOPNOTSUPP; 321 } 322 } 323 324 static const u8 ina3221_curr_reg[][INA3221_NUM_CHANNELS + 1] = { 325 [hwmon_curr_input] = { INA3221_SHUNT1, INA3221_SHUNT2, 326 INA3221_SHUNT3, INA3221_SHUNT_SUM }, 327 [hwmon_curr_max] = { INA3221_WARN1, INA3221_WARN2, INA3221_WARN3, 0 }, 328 [hwmon_curr_crit] = { INA3221_CRIT1, INA3221_CRIT2, 329 INA3221_CRIT3, INA3221_CRIT_SUM }, 330 [hwmon_curr_max_alarm] = { F_WF1, F_WF2, F_WF3, 0 }, 331 [hwmon_curr_crit_alarm] = { F_CF1, F_CF2, F_CF3, F_SF }, 332 }; 333 334 static int ina3221_read_curr(struct device *dev, u32 attr, 335 int channel, long *val) 336 { 337 struct ina3221_data *ina = dev_get_drvdata(dev); 338 struct ina3221_input *input = ina->inputs; 339 u8 reg = ina3221_curr_reg[attr][channel]; 340 int resistance_uo, voltage_nv; 341 int regval, ret; 342 343 if (channel > INA3221_CHANNEL3) 344 resistance_uo = ina->summation_shunt_resistor; 345 else 346 resistance_uo = input[channel].shunt_resistor; 347 348 switch (attr) { 349 case hwmon_curr_input: 350 if (!ina3221_is_enabled(ina, channel)) 351 return -ENODATA; 352 353 /* Write CONFIG register to trigger a single-shot measurement */ 354 if (ina->single_shot) { 355 regmap_write(ina->regmap, INA3221_CONFIG, 356 ina->reg_config); 357 358 ret = ina3221_wait_for_data(ina); 359 if (ret) 360 return ret; 361 } 362 363 fallthrough; 364 case hwmon_curr_crit: 365 case hwmon_curr_max: 366 if (!resistance_uo) 367 return -ENODATA; 368 369 ret = ina3221_read_value(ina, reg, ®val); 370 if (ret) 371 return ret; 372 373 /* Scale of shunt voltage: LSB is 40uV (40000nV) */ 374 voltage_nv = regval * 40000; 375 /* Return current in mA */ 376 *val = DIV_ROUND_CLOSEST(voltage_nv, resistance_uo); 377 return 0; 378 case hwmon_curr_crit_alarm: 379 case hwmon_curr_max_alarm: 380 /* No actual register read if channel is disabled */ 381 if (!ina3221_is_enabled(ina, channel)) { 382 /* Return 0 for alert flags */ 383 *val = 0; 384 return 0; 385 } 386 ret = regmap_field_read(ina->fields[reg], ®val); 387 if (ret) 388 return ret; 389 *val = regval; 390 return 0; 391 default: 392 return -EOPNOTSUPP; 393 } 394 } 395 396 static int ina3221_write_chip(struct device *dev, u32 attr, long val) 397 { 398 struct ina3221_data *ina = dev_get_drvdata(dev); 399 int ret, idx; 400 u32 tmp; 401 402 switch (attr) { 403 case hwmon_chip_samples: 404 idx = find_closest(val, ina3221_avg_samples, 405 ARRAY_SIZE(ina3221_avg_samples)); 406 407 tmp = (ina->reg_config & ~INA3221_CONFIG_AVG_MASK) | 408 (idx << INA3221_CONFIG_AVG_SHIFT); 409 ret = regmap_write(ina->regmap, INA3221_CONFIG, tmp); 410 if (ret) 411 return ret; 412 413 /* Update reg_config accordingly */ 414 ina->reg_config = tmp; 415 return 0; 416 case hwmon_chip_update_interval: 417 tmp = ina3221_interval_ms_to_conv_time(ina->reg_config, val); 418 idx = find_closest(tmp, ina3221_conv_time, 419 ARRAY_SIZE(ina3221_conv_time)); 420 421 /* Update Bus and Shunt voltage conversion times */ 422 tmp = INA3221_CONFIG_VBUS_CT_MASK | INA3221_CONFIG_VSH_CT_MASK; 423 tmp = (ina->reg_config & ~tmp) | 424 (idx << INA3221_CONFIG_VBUS_CT_SHIFT) | 425 (idx << INA3221_CONFIG_VSH_CT_SHIFT); 426 ret = regmap_write(ina->regmap, INA3221_CONFIG, tmp); 427 if (ret) 428 return ret; 429 430 /* Update reg_config accordingly */ 431 ina->reg_config = tmp; 432 return 0; 433 default: 434 return -EOPNOTSUPP; 435 } 436 } 437 438 static int ina3221_write_curr(struct device *dev, u32 attr, 439 int channel, long val) 440 { 441 struct ina3221_data *ina = dev_get_drvdata(dev); 442 struct ina3221_input *input = ina->inputs; 443 u8 reg = ina3221_curr_reg[attr][channel]; 444 int resistance_uo, current_ma, voltage_uv; 445 int regval; 446 447 if (channel > INA3221_CHANNEL3) 448 resistance_uo = ina->summation_shunt_resistor; 449 else 450 resistance_uo = input[channel].shunt_resistor; 451 452 if (!resistance_uo) 453 return -EOPNOTSUPP; 454 455 /* clamp current */ 456 current_ma = clamp_val(val, 457 INT_MIN / resistance_uo, 458 INT_MAX / resistance_uo); 459 460 voltage_uv = DIV_ROUND_CLOSEST(current_ma * resistance_uo, 1000); 461 462 /* clamp voltage */ 463 voltage_uv = clamp_val(voltage_uv, -163800, 163800); 464 465 /* 466 * Formula to convert voltage_uv to register value: 467 * regval = (voltage_uv / scale) << shift 468 * Note: 469 * The scale is 40uV for all shunt voltage registers 470 * Shunt Voltage Sum register left-shifts 1 bit 471 * All other Shunt Voltage registers shift 3 bits 472 * Results: 473 * SHUNT_SUM: (1 / 40uV) << 1 = 1 / 20uV 474 * SHUNT[1-3]: (1 / 40uV) << 3 = 1 / 5uV 475 */ 476 if (reg == INA3221_SHUNT_SUM || reg == INA3221_CRIT_SUM) 477 regval = DIV_ROUND_CLOSEST(voltage_uv, 20) & 0xfffe; 478 else 479 regval = DIV_ROUND_CLOSEST(voltage_uv, 5) & 0xfff8; 480 481 return regmap_write(ina->regmap, reg, regval); 482 } 483 484 static int ina3221_write_enable(struct device *dev, int channel, bool enable) 485 { 486 struct ina3221_data *ina = dev_get_drvdata(dev); 487 u16 config, mask = INA3221_CONFIG_CHx_EN(channel); 488 u16 config_old = ina->reg_config & mask; 489 u32 tmp; 490 int ret; 491 492 config = enable ? mask : 0; 493 494 /* Bypass if enable status is not being changed */ 495 if (config_old == config) 496 return 0; 497 498 /* For enabling routine, increase refcount and resume() at first */ 499 if (enable) { 500 ret = pm_runtime_resume_and_get(ina->pm_dev); 501 if (ret < 0) { 502 dev_err(dev, "Failed to get PM runtime\n"); 503 return ret; 504 } 505 } 506 507 /* Enable or disable the channel */ 508 tmp = (ina->reg_config & ~mask) | (config & mask); 509 ret = regmap_write(ina->regmap, INA3221_CONFIG, tmp); 510 if (ret) 511 goto fail; 512 513 /* Cache the latest config register value */ 514 ina->reg_config = tmp; 515 516 /* For disabling routine, decrease refcount or suspend() at last */ 517 if (!enable) 518 pm_runtime_put_sync(ina->pm_dev); 519 520 return 0; 521 522 fail: 523 if (enable) { 524 dev_err(dev, "Failed to enable channel %d: error %d\n", 525 channel, ret); 526 pm_runtime_put_sync(ina->pm_dev); 527 } 528 529 return ret; 530 } 531 532 static int ina3221_read(struct device *dev, enum hwmon_sensor_types type, 533 u32 attr, int channel, long *val) 534 { 535 struct ina3221_data *ina = dev_get_drvdata(dev); 536 int ret; 537 538 mutex_lock(&ina->lock); 539 540 switch (type) { 541 case hwmon_chip: 542 ret = ina3221_read_chip(dev, attr, val); 543 break; 544 case hwmon_in: 545 /* 0-align channel ID */ 546 ret = ina3221_read_in(dev, attr, channel - 1, val); 547 break; 548 case hwmon_curr: 549 ret = ina3221_read_curr(dev, attr, channel, val); 550 break; 551 default: 552 ret = -EOPNOTSUPP; 553 break; 554 } 555 556 mutex_unlock(&ina->lock); 557 558 return ret; 559 } 560 561 static int ina3221_write(struct device *dev, enum hwmon_sensor_types type, 562 u32 attr, int channel, long val) 563 { 564 struct ina3221_data *ina = dev_get_drvdata(dev); 565 int ret; 566 567 mutex_lock(&ina->lock); 568 569 switch (type) { 570 case hwmon_chip: 571 ret = ina3221_write_chip(dev, attr, val); 572 break; 573 case hwmon_in: 574 /* 0-align channel ID */ 575 ret = ina3221_write_enable(dev, channel - 1, val); 576 break; 577 case hwmon_curr: 578 ret = ina3221_write_curr(dev, attr, channel, val); 579 break; 580 default: 581 ret = -EOPNOTSUPP; 582 break; 583 } 584 585 mutex_unlock(&ina->lock); 586 587 return ret; 588 } 589 590 static int ina3221_read_string(struct device *dev, enum hwmon_sensor_types type, 591 u32 attr, int channel, const char **str) 592 { 593 struct ina3221_data *ina = dev_get_drvdata(dev); 594 int index = channel - 1; 595 596 if (channel == 7) 597 *str = "sum of shunt voltages"; 598 else 599 *str = ina->inputs[index].label; 600 601 return 0; 602 } 603 604 static umode_t ina3221_is_visible(const void *drvdata, 605 enum hwmon_sensor_types type, 606 u32 attr, int channel) 607 { 608 const struct ina3221_data *ina = drvdata; 609 const struct ina3221_input *input = NULL; 610 611 switch (type) { 612 case hwmon_chip: 613 switch (attr) { 614 case hwmon_chip_samples: 615 case hwmon_chip_update_interval: 616 return 0644; 617 default: 618 return 0; 619 } 620 case hwmon_in: 621 /* Ignore in0_ */ 622 if (channel == 0) 623 return 0; 624 625 switch (attr) { 626 case hwmon_in_label: 627 if (channel - 1 <= INA3221_CHANNEL3) 628 input = &ina->inputs[channel - 1]; 629 else if (channel == 7) 630 return 0444; 631 /* Hide label node if label is not provided */ 632 return (input && input->label) ? 0444 : 0; 633 case hwmon_in_input: 634 return 0444; 635 case hwmon_in_enable: 636 return 0644; 637 default: 638 return 0; 639 } 640 case hwmon_curr: 641 switch (attr) { 642 case hwmon_curr_input: 643 case hwmon_curr_crit_alarm: 644 case hwmon_curr_max_alarm: 645 return 0444; 646 case hwmon_curr_crit: 647 case hwmon_curr_max: 648 return 0644; 649 default: 650 return 0; 651 } 652 default: 653 return 0; 654 } 655 } 656 657 #define INA3221_HWMON_CURR_CONFIG (HWMON_C_INPUT | \ 658 HWMON_C_CRIT | HWMON_C_CRIT_ALARM | \ 659 HWMON_C_MAX | HWMON_C_MAX_ALARM) 660 661 static const struct hwmon_channel_info * const ina3221_info[] = { 662 HWMON_CHANNEL_INFO(chip, 663 HWMON_C_SAMPLES, 664 HWMON_C_UPDATE_INTERVAL), 665 HWMON_CHANNEL_INFO(in, 666 /* 0: dummy, skipped in is_visible */ 667 HWMON_I_INPUT, 668 /* 1-3: input voltage Channels */ 669 HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL, 670 HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL, 671 HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL, 672 /* 4-6: shunt voltage Channels */ 673 HWMON_I_INPUT, 674 HWMON_I_INPUT, 675 HWMON_I_INPUT, 676 /* 7: summation of shunt voltage channels */ 677 HWMON_I_INPUT | HWMON_I_LABEL), 678 HWMON_CHANNEL_INFO(curr, 679 /* 1-3: current channels*/ 680 INA3221_HWMON_CURR_CONFIG, 681 INA3221_HWMON_CURR_CONFIG, 682 INA3221_HWMON_CURR_CONFIG, 683 /* 4: summation of current channels */ 684 HWMON_C_INPUT | HWMON_C_CRIT | HWMON_C_CRIT_ALARM), 685 NULL 686 }; 687 688 static const struct hwmon_ops ina3221_hwmon_ops = { 689 .is_visible = ina3221_is_visible, 690 .read_string = ina3221_read_string, 691 .read = ina3221_read, 692 .write = ina3221_write, 693 }; 694 695 static const struct hwmon_chip_info ina3221_chip_info = { 696 .ops = &ina3221_hwmon_ops, 697 .info = ina3221_info, 698 }; 699 700 /* Extra attribute groups */ 701 static ssize_t ina3221_shunt_show(struct device *dev, 702 struct device_attribute *attr, char *buf) 703 { 704 struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr); 705 struct ina3221_data *ina = dev_get_drvdata(dev); 706 unsigned int channel = sd_attr->index; 707 struct ina3221_input *input = &ina->inputs[channel]; 708 709 return sysfs_emit(buf, "%d\n", input->shunt_resistor); 710 } 711 712 static ssize_t ina3221_shunt_store(struct device *dev, 713 struct device_attribute *attr, 714 const char *buf, size_t count) 715 { 716 struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr); 717 struct ina3221_data *ina = dev_get_drvdata(dev); 718 unsigned int channel = sd_attr->index; 719 struct ina3221_input *input = &ina->inputs[channel]; 720 int val; 721 int ret; 722 723 ret = kstrtoint(buf, 0, &val); 724 if (ret) 725 return ret; 726 727 val = clamp_val(val, 1, INT_MAX); 728 729 input->shunt_resistor = val; 730 731 /* Update summation_shunt_resistor for summation channel */ 732 ina->summation_shunt_resistor = ina3221_summation_shunt_resistor(ina); 733 734 return count; 735 } 736 737 /* shunt resistance */ 738 static SENSOR_DEVICE_ATTR_RW(shunt1_resistor, ina3221_shunt, INA3221_CHANNEL1); 739 static SENSOR_DEVICE_ATTR_RW(shunt2_resistor, ina3221_shunt, INA3221_CHANNEL2); 740 static SENSOR_DEVICE_ATTR_RW(shunt3_resistor, ina3221_shunt, INA3221_CHANNEL3); 741 742 static struct attribute *ina3221_attrs[] = { 743 &sensor_dev_attr_shunt1_resistor.dev_attr.attr, 744 &sensor_dev_attr_shunt2_resistor.dev_attr.attr, 745 &sensor_dev_attr_shunt3_resistor.dev_attr.attr, 746 NULL, 747 }; 748 ATTRIBUTE_GROUPS(ina3221); 749 750 static const struct regmap_range ina3221_yes_ranges[] = { 751 regmap_reg_range(INA3221_CONFIG, INA3221_BUS3), 752 regmap_reg_range(INA3221_SHUNT_SUM, INA3221_SHUNT_SUM), 753 regmap_reg_range(INA3221_MASK_ENABLE, INA3221_MASK_ENABLE), 754 }; 755 756 static const struct regmap_access_table ina3221_volatile_table = { 757 .yes_ranges = ina3221_yes_ranges, 758 .n_yes_ranges = ARRAY_SIZE(ina3221_yes_ranges), 759 }; 760 761 static const struct regmap_config ina3221_regmap_config = { 762 .reg_bits = 8, 763 .val_bits = 16, 764 765 .cache_type = REGCACHE_MAPLE, 766 .volatile_table = &ina3221_volatile_table, 767 }; 768 769 static int ina3221_probe_child_from_dt(struct device *dev, 770 struct device_node *child, 771 struct ina3221_data *ina) 772 { 773 struct ina3221_input *input; 774 u32 val; 775 int ret; 776 777 ret = of_property_read_u32(child, "reg", &val); 778 if (ret) { 779 dev_err(dev, "missing reg property of %pOFn\n", child); 780 return ret; 781 } else if (val > INA3221_CHANNEL3) { 782 dev_err(dev, "invalid reg %d of %pOFn\n", val, child); 783 return -EINVAL; 784 } 785 786 input = &ina->inputs[val]; 787 788 /* Log the disconnected channel input */ 789 if (!of_device_is_available(child)) { 790 input->disconnected = true; 791 return 0; 792 } 793 794 /* Save the connected input label if available */ 795 of_property_read_string(child, "label", &input->label); 796 797 /* summation channel control */ 798 input->summation_disable = of_property_read_bool(child, "ti,summation-disable"); 799 800 /* Overwrite default shunt resistor value optionally */ 801 if (!of_property_read_u32(child, "shunt-resistor-micro-ohms", &val)) { 802 if (val < 1 || val > INT_MAX) { 803 dev_err(dev, "invalid shunt resistor value %u of %pOFn\n", 804 val, child); 805 return -EINVAL; 806 } 807 input->shunt_resistor = val; 808 } 809 810 return 0; 811 } 812 813 static int ina3221_probe_from_dt(struct device *dev, struct ina3221_data *ina) 814 { 815 const struct device_node *np = dev->of_node; 816 struct device_node *child; 817 int ret; 818 819 /* Compatible with non-DT platforms */ 820 if (!np) 821 return 0; 822 823 ina->single_shot = of_property_read_bool(np, "ti,single-shot"); 824 825 for_each_child_of_node(np, child) { 826 ret = ina3221_probe_child_from_dt(dev, child, ina); 827 if (ret) { 828 of_node_put(child); 829 return ret; 830 } 831 } 832 833 return 0; 834 } 835 836 static int ina3221_probe(struct i2c_client *client) 837 { 838 struct device *dev = &client->dev; 839 struct ina3221_data *ina; 840 struct device *hwmon_dev; 841 char name[32]; 842 int i, ret; 843 844 ina = devm_kzalloc(dev, sizeof(*ina), GFP_KERNEL); 845 if (!ina) 846 return -ENOMEM; 847 848 ina->regmap = devm_regmap_init_i2c(client, &ina3221_regmap_config); 849 if (IS_ERR(ina->regmap)) { 850 dev_err(dev, "Unable to allocate register map\n"); 851 return PTR_ERR(ina->regmap); 852 } 853 854 for (i = 0; i < F_MAX_FIELDS; i++) { 855 ina->fields[i] = devm_regmap_field_alloc(dev, 856 ina->regmap, 857 ina3221_reg_fields[i]); 858 if (IS_ERR(ina->fields[i])) { 859 dev_err(dev, "Unable to allocate regmap fields\n"); 860 return PTR_ERR(ina->fields[i]); 861 } 862 } 863 864 for (i = 0; i < INA3221_NUM_CHANNELS; i++) 865 ina->inputs[i].shunt_resistor = INA3221_RSHUNT_DEFAULT; 866 867 ret = ina3221_probe_from_dt(dev, ina); 868 if (ret) { 869 dev_err(dev, "Unable to probe from device tree\n"); 870 return ret; 871 } 872 873 /* The driver will be reset, so use reset value */ 874 ina->reg_config = INA3221_CONFIG_DEFAULT; 875 876 /* Clear continuous bit to use single-shot mode */ 877 if (ina->single_shot) 878 ina->reg_config &= ~INA3221_CONFIG_MODE_CONTINUOUS; 879 880 /* Disable channels if their inputs are disconnected */ 881 for (i = 0; i < INA3221_NUM_CHANNELS; i++) { 882 if (ina->inputs[i].disconnected) 883 ina->reg_config &= ~INA3221_CONFIG_CHx_EN(i); 884 } 885 886 /* Initialize summation_shunt_resistor for summation channel control */ 887 ina->summation_shunt_resistor = ina3221_summation_shunt_resistor(ina); 888 for (i = 0; i < INA3221_NUM_CHANNELS; i++) { 889 if (!ina->inputs[i].summation_disable) 890 ina->summation_channel_control |= BIT(14 - i); 891 } 892 893 ina->pm_dev = dev; 894 mutex_init(&ina->lock); 895 dev_set_drvdata(dev, ina); 896 897 /* Enable PM runtime -- status is suspended by default */ 898 pm_runtime_enable(ina->pm_dev); 899 900 /* Initialize (resume) the device */ 901 for (i = 0; i < INA3221_NUM_CHANNELS; i++) { 902 if (ina->inputs[i].disconnected) 903 continue; 904 /* Match the refcount with number of enabled channels */ 905 ret = pm_runtime_get_sync(ina->pm_dev); 906 if (ret < 0) 907 goto fail; 908 } 909 910 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, ina, 911 &ina3221_chip_info, 912 ina3221_groups); 913 if (IS_ERR(hwmon_dev)) { 914 dev_err(dev, "Unable to register hwmon device\n"); 915 ret = PTR_ERR(hwmon_dev); 916 goto fail; 917 } 918 919 scnprintf(name, sizeof(name), "%s-%s", INA3221_DRIVER_NAME, dev_name(dev)); 920 ina->debugfs = debugfs_create_dir(name, NULL); 921 922 for (i = 0; i < INA3221_NUM_CHANNELS; i++) { 923 scnprintf(name, sizeof(name), "in%d_summation_disable", i); 924 debugfs_create_bool(name, 0400, ina->debugfs, 925 &ina->inputs[i].summation_disable); 926 } 927 928 return 0; 929 930 fail: 931 pm_runtime_disable(ina->pm_dev); 932 pm_runtime_set_suspended(ina->pm_dev); 933 /* pm_runtime_put_noidle() will decrease the PM refcount until 0 */ 934 for (i = 0; i < INA3221_NUM_CHANNELS; i++) 935 pm_runtime_put_noidle(ina->pm_dev); 936 mutex_destroy(&ina->lock); 937 938 return ret; 939 } 940 941 static void ina3221_remove(struct i2c_client *client) 942 { 943 struct ina3221_data *ina = dev_get_drvdata(&client->dev); 944 int i; 945 946 debugfs_remove_recursive(ina->debugfs); 947 948 pm_runtime_disable(ina->pm_dev); 949 pm_runtime_set_suspended(ina->pm_dev); 950 951 /* pm_runtime_put_noidle() will decrease the PM refcount until 0 */ 952 for (i = 0; i < INA3221_NUM_CHANNELS; i++) 953 pm_runtime_put_noidle(ina->pm_dev); 954 955 mutex_destroy(&ina->lock); 956 } 957 958 static int ina3221_suspend(struct device *dev) 959 { 960 struct ina3221_data *ina = dev_get_drvdata(dev); 961 int ret; 962 963 /* Save config register value and enable cache-only */ 964 ret = regmap_read(ina->regmap, INA3221_CONFIG, &ina->reg_config); 965 if (ret) 966 return ret; 967 968 /* Set to power-down mode for power saving */ 969 ret = regmap_update_bits(ina->regmap, INA3221_CONFIG, 970 INA3221_CONFIG_MODE_MASK, 971 INA3221_CONFIG_MODE_POWERDOWN); 972 if (ret) 973 return ret; 974 975 regcache_cache_only(ina->regmap, true); 976 regcache_mark_dirty(ina->regmap); 977 978 return 0; 979 } 980 981 static int ina3221_resume(struct device *dev) 982 { 983 struct ina3221_data *ina = dev_get_drvdata(dev); 984 int ret; 985 986 regcache_cache_only(ina->regmap, false); 987 988 /* Software reset the chip */ 989 ret = regmap_field_write(ina->fields[F_RST], true); 990 if (ret) { 991 dev_err(dev, "Unable to reset device\n"); 992 return ret; 993 } 994 995 /* Restore cached register values to hardware */ 996 ret = regcache_sync(ina->regmap); 997 if (ret) 998 return ret; 999 1000 /* Restore config register value to hardware */ 1001 ret = regmap_write(ina->regmap, INA3221_CONFIG, ina->reg_config); 1002 if (ret) 1003 return ret; 1004 1005 /* Initialize summation channel control */ 1006 if (ina->summation_shunt_resistor) { 1007 /* 1008 * Sum only channels that are not disabled for summation. 1009 * Shunt measurements of disconnected channels should 1010 * be 0, so it does not matter for summation. 1011 */ 1012 ret = regmap_update_bits(ina->regmap, INA3221_MASK_ENABLE, 1013 INA3221_MASK_ENABLE_SCC_MASK, 1014 ina->summation_channel_control); 1015 if (ret) { 1016 dev_err(dev, "Unable to control summation channel\n"); 1017 return ret; 1018 } 1019 } 1020 1021 return 0; 1022 } 1023 1024 static DEFINE_RUNTIME_DEV_PM_OPS(ina3221_pm, ina3221_suspend, ina3221_resume, 1025 NULL); 1026 1027 static const struct of_device_id ina3221_of_match_table[] = { 1028 { .compatible = "ti,ina3221", }, 1029 { /* sentinel */ } 1030 }; 1031 MODULE_DEVICE_TABLE(of, ina3221_of_match_table); 1032 1033 static const struct i2c_device_id ina3221_ids[] = { 1034 { "ina3221" }, 1035 { /* sentinel */ } 1036 }; 1037 MODULE_DEVICE_TABLE(i2c, ina3221_ids); 1038 1039 static struct i2c_driver ina3221_i2c_driver = { 1040 .probe = ina3221_probe, 1041 .remove = ina3221_remove, 1042 .driver = { 1043 .name = INA3221_DRIVER_NAME, 1044 .of_match_table = ina3221_of_match_table, 1045 .pm = pm_ptr(&ina3221_pm), 1046 }, 1047 .id_table = ina3221_ids, 1048 }; 1049 module_i2c_driver(ina3221_i2c_driver); 1050 1051 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>"); 1052 MODULE_DESCRIPTION("Texas Instruments INA3221 HWMon Driver"); 1053 MODULE_LICENSE("GPL v2"); 1054