1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Driver for the Texas Instruments / Burr Brown INA209 4 * Bidirectional Current/Power Monitor 5 * 6 * Copyright (C) 2012 Guenter Roeck <linux@roeck-us.net> 7 * 8 * Derived from Ira W. Snyder's original driver submission 9 * Copyright (C) 2008 Paul Hays <Paul.Hays@cattail.ca> 10 * Copyright (C) 2008-2009 Ira W. Snyder <iws@ovro.caltech.edu> 11 * 12 * Aligned with ina2xx driver 13 * Copyright (C) 2012 Lothar Felten <l-felten@ti.com> 14 * Thanks to Jan Volkering 15 * 16 * Datasheet: 17 * https://www.ti.com/lit/gpn/ina209 18 */ 19 20 #include <linux/kernel.h> 21 #include <linux/module.h> 22 #include <linux/init.h> 23 #include <linux/err.h> 24 #include <linux/slab.h> 25 #include <linux/bug.h> 26 #include <linux/i2c.h> 27 #include <linux/hwmon.h> 28 #include <linux/hwmon-sysfs.h> 29 30 /* register definitions */ 31 #define INA209_CONFIGURATION 0x00 32 #define INA209_STATUS 0x01 33 #define INA209_STATUS_MASK 0x02 34 #define INA209_SHUNT_VOLTAGE 0x03 35 #define INA209_BUS_VOLTAGE 0x04 36 #define INA209_POWER 0x05 37 #define INA209_CURRENT 0x06 38 #define INA209_SHUNT_VOLTAGE_POS_PEAK 0x07 39 #define INA209_SHUNT_VOLTAGE_NEG_PEAK 0x08 40 #define INA209_BUS_VOLTAGE_MAX_PEAK 0x09 41 #define INA209_BUS_VOLTAGE_MIN_PEAK 0x0a 42 #define INA209_POWER_PEAK 0x0b 43 #define INA209_SHUNT_VOLTAGE_POS_WARN 0x0c 44 #define INA209_SHUNT_VOLTAGE_NEG_WARN 0x0d 45 #define INA209_POWER_WARN 0x0e 46 #define INA209_BUS_VOLTAGE_OVER_WARN 0x0f 47 #define INA209_BUS_VOLTAGE_UNDER_WARN 0x10 48 #define INA209_POWER_OVER_LIMIT 0x11 49 #define INA209_BUS_VOLTAGE_OVER_LIMIT 0x12 50 #define INA209_BUS_VOLTAGE_UNDER_LIMIT 0x13 51 #define INA209_CRITICAL_DAC_POS 0x14 52 #define INA209_CRITICAL_DAC_NEG 0x15 53 #define INA209_CALIBRATION 0x16 54 55 #define INA209_REGISTERS 0x17 56 57 #define INA209_CONFIG_DEFAULT 0x3c47 /* PGA=8, full range */ 58 #define INA209_SHUNT_DEFAULT 10000 /* uOhm */ 59 60 struct ina209_data { 61 struct i2c_client *client; 62 63 struct mutex update_lock; 64 bool valid; 65 unsigned long last_updated; /* in jiffies */ 66 67 u16 regs[INA209_REGISTERS]; /* All chip registers */ 68 69 u16 config_orig; /* Original configuration */ 70 u16 calibration_orig; /* Original calibration */ 71 u16 update_interval; 72 }; 73 74 static struct ina209_data *ina209_update_device(struct device *dev) 75 { 76 struct ina209_data *data = dev_get_drvdata(dev); 77 struct i2c_client *client = data->client; 78 struct ina209_data *ret = data; 79 s32 val; 80 int i; 81 82 mutex_lock(&data->update_lock); 83 84 if (!data->valid || 85 time_after(jiffies, data->last_updated + data->update_interval)) { 86 for (i = 0; i < ARRAY_SIZE(data->regs); i++) { 87 val = i2c_smbus_read_word_swapped(client, i); 88 if (val < 0) { 89 ret = ERR_PTR(val); 90 goto abort; 91 } 92 data->regs[i] = val; 93 } 94 data->last_updated = jiffies; 95 data->valid = true; 96 } 97 abort: 98 mutex_unlock(&data->update_lock); 99 return ret; 100 } 101 102 /* 103 * Read a value from a device register and convert it to the 104 * appropriate sysfs units 105 */ 106 static long ina209_from_reg(const u8 reg, const u16 val) 107 { 108 switch (reg) { 109 case INA209_SHUNT_VOLTAGE: 110 case INA209_SHUNT_VOLTAGE_POS_PEAK: 111 case INA209_SHUNT_VOLTAGE_NEG_PEAK: 112 case INA209_SHUNT_VOLTAGE_POS_WARN: 113 case INA209_SHUNT_VOLTAGE_NEG_WARN: 114 /* LSB=10 uV. Convert to mV. */ 115 return DIV_ROUND_CLOSEST((s16)val, 100); 116 117 case INA209_BUS_VOLTAGE: 118 case INA209_BUS_VOLTAGE_MAX_PEAK: 119 case INA209_BUS_VOLTAGE_MIN_PEAK: 120 case INA209_BUS_VOLTAGE_OVER_WARN: 121 case INA209_BUS_VOLTAGE_UNDER_WARN: 122 case INA209_BUS_VOLTAGE_OVER_LIMIT: 123 case INA209_BUS_VOLTAGE_UNDER_LIMIT: 124 /* LSB=4 mV, last 3 bits unused */ 125 return (val >> 3) * 4; 126 127 case INA209_CRITICAL_DAC_POS: 128 /* LSB=1 mV, in the upper 8 bits */ 129 return val >> 8; 130 131 case INA209_CRITICAL_DAC_NEG: 132 /* LSB=1 mV, in the upper 8 bits */ 133 return -1 * (val >> 8); 134 135 case INA209_POWER: 136 case INA209_POWER_PEAK: 137 case INA209_POWER_WARN: 138 case INA209_POWER_OVER_LIMIT: 139 /* LSB=20 mW. Convert to uW */ 140 return val * 20 * 1000L; 141 142 case INA209_CURRENT: 143 /* LSB=1 mA (selected). Is in mA */ 144 return (s16)val; 145 } 146 147 /* programmer goofed */ 148 WARN_ON_ONCE(1); 149 return 0; 150 } 151 152 /* 153 * Take a value and convert it to register format, clamping the value 154 * to the appropriate range. 155 */ 156 static int ina209_to_reg(u8 reg, u16 old, long val) 157 { 158 switch (reg) { 159 case INA209_SHUNT_VOLTAGE_POS_WARN: 160 case INA209_SHUNT_VOLTAGE_NEG_WARN: 161 /* Limit to +- 320 mV, 10 uV LSB */ 162 return clamp_val(val, -320, 320) * 100; 163 164 case INA209_BUS_VOLTAGE_OVER_WARN: 165 case INA209_BUS_VOLTAGE_UNDER_WARN: 166 case INA209_BUS_VOLTAGE_OVER_LIMIT: 167 case INA209_BUS_VOLTAGE_UNDER_LIMIT: 168 /* 169 * Limit to 0-32000 mV, 4 mV LSB 170 * 171 * The last three bits aren't part of the value, but we'll 172 * preserve them in their original state. 173 */ 174 return (DIV_ROUND_CLOSEST(clamp_val(val, 0, 32000), 4) << 3) 175 | (old & 0x7); 176 177 case INA209_CRITICAL_DAC_NEG: 178 /* 179 * Limit to -255-0 mV, 1 mV LSB 180 * Convert the value to a positive value for the register 181 * 182 * The value lives in the top 8 bits only, be careful 183 * and keep original value of other bits. 184 */ 185 return (clamp_val(-val, 0, 255) << 8) | (old & 0xff); 186 187 case INA209_CRITICAL_DAC_POS: 188 /* 189 * Limit to 0-255 mV, 1 mV LSB 190 * 191 * The value lives in the top 8 bits only, be careful 192 * and keep original value of other bits. 193 */ 194 return (clamp_val(val, 0, 255) << 8) | (old & 0xff); 195 196 case INA209_POWER_WARN: 197 case INA209_POWER_OVER_LIMIT: 198 /* 20 mW LSB */ 199 return DIV_ROUND_CLOSEST(val, 20 * 1000); 200 } 201 202 /* Other registers are read-only, return access error */ 203 return -EACCES; 204 } 205 206 static int ina209_interval_from_reg(u16 reg) 207 { 208 return 68 >> (15 - ((reg >> 3) & 0x0f)); 209 } 210 211 static u16 ina209_reg_from_interval(u16 config, long interval) 212 { 213 int i, adc; 214 215 if (interval <= 0) { 216 adc = 8; 217 } else { 218 adc = 15; 219 for (i = 34 + 34 / 2; i; i >>= 1) { 220 if (i < interval) 221 break; 222 adc--; 223 } 224 } 225 return (config & 0xf807) | (adc << 3) | (adc << 7); 226 } 227 228 static ssize_t ina209_interval_store(struct device *dev, 229 struct device_attribute *da, 230 const char *buf, size_t count) 231 { 232 struct ina209_data *data = ina209_update_device(dev); 233 long val; 234 u16 regval; 235 int ret; 236 237 if (IS_ERR(data)) 238 return PTR_ERR(data); 239 240 ret = kstrtol(buf, 10, &val); 241 if (ret < 0) 242 return ret; 243 244 mutex_lock(&data->update_lock); 245 regval = ina209_reg_from_interval(data->regs[INA209_CONFIGURATION], 246 val); 247 i2c_smbus_write_word_swapped(data->client, INA209_CONFIGURATION, 248 regval); 249 data->regs[INA209_CONFIGURATION] = regval; 250 data->update_interval = ina209_interval_from_reg(regval); 251 mutex_unlock(&data->update_lock); 252 return count; 253 } 254 255 static ssize_t ina209_interval_show(struct device *dev, 256 struct device_attribute *da, char *buf) 257 { 258 struct ina209_data *data = dev_get_drvdata(dev); 259 260 return sysfs_emit(buf, "%d\n", data->update_interval); 261 } 262 263 /* 264 * History is reset by writing 1 into bit 0 of the respective peak register. 265 * Since more than one peak register may be affected by the scope of a 266 * reset_history attribute write, use a bit mask in attr->index to identify 267 * which registers are affected. 268 */ 269 static u16 ina209_reset_history_regs[] = { 270 INA209_SHUNT_VOLTAGE_POS_PEAK, 271 INA209_SHUNT_VOLTAGE_NEG_PEAK, 272 INA209_BUS_VOLTAGE_MAX_PEAK, 273 INA209_BUS_VOLTAGE_MIN_PEAK, 274 INA209_POWER_PEAK 275 }; 276 277 static ssize_t ina209_history_store(struct device *dev, 278 struct device_attribute *da, 279 const char *buf, size_t count) 280 { 281 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 282 struct ina209_data *data = dev_get_drvdata(dev); 283 struct i2c_client *client = data->client; 284 u32 mask = attr->index; 285 long val; 286 int i, ret; 287 288 ret = kstrtol(buf, 10, &val); 289 if (ret < 0) 290 return ret; 291 292 mutex_lock(&data->update_lock); 293 for (i = 0; i < ARRAY_SIZE(ina209_reset_history_regs); i++) { 294 if (mask & (1 << i)) 295 i2c_smbus_write_word_swapped(client, 296 ina209_reset_history_regs[i], 1); 297 } 298 data->valid = false; 299 mutex_unlock(&data->update_lock); 300 return count; 301 } 302 303 static ssize_t ina209_value_store(struct device *dev, 304 struct device_attribute *da, 305 const char *buf, size_t count) 306 { 307 struct ina209_data *data = ina209_update_device(dev); 308 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 309 int reg = attr->index; 310 long val; 311 int ret; 312 313 if (IS_ERR(data)) 314 return PTR_ERR(data); 315 316 ret = kstrtol(buf, 10, &val); 317 if (ret < 0) 318 return ret; 319 320 mutex_lock(&data->update_lock); 321 ret = ina209_to_reg(reg, data->regs[reg], val); 322 if (ret < 0) { 323 count = ret; 324 goto abort; 325 } 326 i2c_smbus_write_word_swapped(data->client, reg, ret); 327 data->regs[reg] = ret; 328 abort: 329 mutex_unlock(&data->update_lock); 330 return count; 331 } 332 333 static ssize_t ina209_value_show(struct device *dev, 334 struct device_attribute *da, char *buf) 335 { 336 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 337 struct ina209_data *data = ina209_update_device(dev); 338 long val; 339 340 if (IS_ERR(data)) 341 return PTR_ERR(data); 342 343 val = ina209_from_reg(attr->index, data->regs[attr->index]); 344 return sysfs_emit(buf, "%ld\n", val); 345 } 346 347 static ssize_t ina209_alarm_show(struct device *dev, 348 struct device_attribute *da, char *buf) 349 { 350 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 351 struct ina209_data *data = ina209_update_device(dev); 352 const unsigned int mask = attr->index; 353 u16 status; 354 355 if (IS_ERR(data)) 356 return PTR_ERR(data); 357 358 status = data->regs[INA209_STATUS]; 359 360 /* 361 * All alarms are in the INA209_STATUS register. To avoid a long 362 * switch statement, the mask is passed in attr->index 363 */ 364 return sysfs_emit(buf, "%u\n", !!(status & mask)); 365 } 366 367 /* Shunt voltage, history, limits, alarms */ 368 static SENSOR_DEVICE_ATTR_RO(in0_input, ina209_value, INA209_SHUNT_VOLTAGE); 369 static SENSOR_DEVICE_ATTR_RO(in0_input_highest, ina209_value, 370 INA209_SHUNT_VOLTAGE_POS_PEAK); 371 static SENSOR_DEVICE_ATTR_RO(in0_input_lowest, ina209_value, 372 INA209_SHUNT_VOLTAGE_NEG_PEAK); 373 static SENSOR_DEVICE_ATTR_WO(in0_reset_history, ina209_history, 374 (1 << 0) | (1 << 1)); 375 static SENSOR_DEVICE_ATTR_RW(in0_max, ina209_value, 376 INA209_SHUNT_VOLTAGE_POS_WARN); 377 static SENSOR_DEVICE_ATTR_RW(in0_min, ina209_value, 378 INA209_SHUNT_VOLTAGE_NEG_WARN); 379 static SENSOR_DEVICE_ATTR_RW(in0_crit_max, ina209_value, 380 INA209_CRITICAL_DAC_POS); 381 static SENSOR_DEVICE_ATTR_RW(in0_crit_min, ina209_value, 382 INA209_CRITICAL_DAC_NEG); 383 384 static SENSOR_DEVICE_ATTR_RO(in0_min_alarm, ina209_alarm, 1 << 11); 385 static SENSOR_DEVICE_ATTR_RO(in0_max_alarm, ina209_alarm, 1 << 12); 386 static SENSOR_DEVICE_ATTR_RO(in0_crit_min_alarm, ina209_alarm, 1 << 6); 387 static SENSOR_DEVICE_ATTR_RO(in0_crit_max_alarm, ina209_alarm, 1 << 7); 388 389 /* Bus voltage, history, limits, alarms */ 390 static SENSOR_DEVICE_ATTR_RO(in1_input, ina209_value, INA209_BUS_VOLTAGE); 391 static SENSOR_DEVICE_ATTR_RO(in1_input_highest, ina209_value, 392 INA209_BUS_VOLTAGE_MAX_PEAK); 393 static SENSOR_DEVICE_ATTR_RO(in1_input_lowest, ina209_value, 394 INA209_BUS_VOLTAGE_MIN_PEAK); 395 static SENSOR_DEVICE_ATTR_WO(in1_reset_history, ina209_history, 396 (1 << 2) | (1 << 3)); 397 static SENSOR_DEVICE_ATTR_RW(in1_max, ina209_value, 398 INA209_BUS_VOLTAGE_OVER_WARN); 399 static SENSOR_DEVICE_ATTR_RW(in1_min, ina209_value, 400 INA209_BUS_VOLTAGE_UNDER_WARN); 401 static SENSOR_DEVICE_ATTR_RW(in1_crit_max, ina209_value, 402 INA209_BUS_VOLTAGE_OVER_LIMIT); 403 static SENSOR_DEVICE_ATTR_RW(in1_crit_min, ina209_value, 404 INA209_BUS_VOLTAGE_UNDER_LIMIT); 405 406 static SENSOR_DEVICE_ATTR_RO(in1_min_alarm, ina209_alarm, 1 << 14); 407 static SENSOR_DEVICE_ATTR_RO(in1_max_alarm, ina209_alarm, 1 << 15); 408 static SENSOR_DEVICE_ATTR_RO(in1_crit_min_alarm, ina209_alarm, 1 << 9); 409 static SENSOR_DEVICE_ATTR_RO(in1_crit_max_alarm, ina209_alarm, 1 << 10); 410 411 /* Power */ 412 static SENSOR_DEVICE_ATTR_RO(power1_input, ina209_value, INA209_POWER); 413 static SENSOR_DEVICE_ATTR_RO(power1_input_highest, ina209_value, 414 INA209_POWER_PEAK); 415 static SENSOR_DEVICE_ATTR_WO(power1_reset_history, ina209_history, 1 << 4); 416 static SENSOR_DEVICE_ATTR_RW(power1_max, ina209_value, INA209_POWER_WARN); 417 static SENSOR_DEVICE_ATTR_RW(power1_crit, ina209_value, 418 INA209_POWER_OVER_LIMIT); 419 420 static SENSOR_DEVICE_ATTR_RO(power1_max_alarm, ina209_alarm, 1 << 13); 421 static SENSOR_DEVICE_ATTR_RO(power1_crit_alarm, ina209_alarm, 1 << 8); 422 423 /* Current */ 424 static SENSOR_DEVICE_ATTR_RO(curr1_input, ina209_value, INA209_CURRENT); 425 426 static SENSOR_DEVICE_ATTR_RW(update_interval, ina209_interval, 0); 427 428 /* 429 * Finally, construct an array of pointers to members of the above objects, 430 * as required for sysfs_create_group() 431 */ 432 static struct attribute *ina209_attrs[] = { 433 &sensor_dev_attr_in0_input.dev_attr.attr, 434 &sensor_dev_attr_in0_input_highest.dev_attr.attr, 435 &sensor_dev_attr_in0_input_lowest.dev_attr.attr, 436 &sensor_dev_attr_in0_reset_history.dev_attr.attr, 437 &sensor_dev_attr_in0_max.dev_attr.attr, 438 &sensor_dev_attr_in0_min.dev_attr.attr, 439 &sensor_dev_attr_in0_crit_max.dev_attr.attr, 440 &sensor_dev_attr_in0_crit_min.dev_attr.attr, 441 &sensor_dev_attr_in0_max_alarm.dev_attr.attr, 442 &sensor_dev_attr_in0_min_alarm.dev_attr.attr, 443 &sensor_dev_attr_in0_crit_max_alarm.dev_attr.attr, 444 &sensor_dev_attr_in0_crit_min_alarm.dev_attr.attr, 445 446 &sensor_dev_attr_in1_input.dev_attr.attr, 447 &sensor_dev_attr_in1_input_highest.dev_attr.attr, 448 &sensor_dev_attr_in1_input_lowest.dev_attr.attr, 449 &sensor_dev_attr_in1_reset_history.dev_attr.attr, 450 &sensor_dev_attr_in1_max.dev_attr.attr, 451 &sensor_dev_attr_in1_min.dev_attr.attr, 452 &sensor_dev_attr_in1_crit_max.dev_attr.attr, 453 &sensor_dev_attr_in1_crit_min.dev_attr.attr, 454 &sensor_dev_attr_in1_max_alarm.dev_attr.attr, 455 &sensor_dev_attr_in1_min_alarm.dev_attr.attr, 456 &sensor_dev_attr_in1_crit_max_alarm.dev_attr.attr, 457 &sensor_dev_attr_in1_crit_min_alarm.dev_attr.attr, 458 459 &sensor_dev_attr_power1_input.dev_attr.attr, 460 &sensor_dev_attr_power1_input_highest.dev_attr.attr, 461 &sensor_dev_attr_power1_reset_history.dev_attr.attr, 462 &sensor_dev_attr_power1_max.dev_attr.attr, 463 &sensor_dev_attr_power1_crit.dev_attr.attr, 464 &sensor_dev_attr_power1_max_alarm.dev_attr.attr, 465 &sensor_dev_attr_power1_crit_alarm.dev_attr.attr, 466 467 &sensor_dev_attr_curr1_input.dev_attr.attr, 468 469 &sensor_dev_attr_update_interval.dev_attr.attr, 470 471 NULL, 472 }; 473 ATTRIBUTE_GROUPS(ina209); 474 475 static void ina209_restore_conf(struct i2c_client *client, 476 struct ina209_data *data) 477 { 478 /* Restore initial configuration */ 479 i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION, 480 data->config_orig); 481 i2c_smbus_write_word_swapped(client, INA209_CALIBRATION, 482 data->calibration_orig); 483 } 484 485 static int ina209_init_client(struct i2c_client *client, 486 struct ina209_data *data) 487 { 488 u32 shunt; 489 int reg; 490 491 reg = i2c_smbus_read_word_swapped(client, INA209_CALIBRATION); 492 if (reg < 0) 493 return reg; 494 data->calibration_orig = reg; 495 496 reg = i2c_smbus_read_word_swapped(client, INA209_CONFIGURATION); 497 if (reg < 0) 498 return reg; 499 data->config_orig = reg; 500 501 if (!of_property_read_u32(client->dev.of_node, "shunt-resistor", 502 &shunt)) { 503 if (shunt == 0) 504 return -EINVAL; 505 } else { 506 shunt = data->calibration_orig ? 507 40960000 / data->calibration_orig : INA209_SHUNT_DEFAULT; 508 } 509 510 i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION, 511 INA209_CONFIG_DEFAULT); 512 data->update_interval = ina209_interval_from_reg(INA209_CONFIG_DEFAULT); 513 514 /* 515 * Calibrate current LSB to 1mA. Shunt is in uOhms. 516 * See equation 13 in datasheet. 517 */ 518 i2c_smbus_write_word_swapped(client, INA209_CALIBRATION, 519 clamp_val(40960000 / shunt, 1, 65535)); 520 521 /* Clear status register */ 522 i2c_smbus_read_word_swapped(client, INA209_STATUS); 523 524 return 0; 525 } 526 527 static int ina209_probe(struct i2c_client *client) 528 { 529 struct i2c_adapter *adapter = client->adapter; 530 struct ina209_data *data; 531 struct device *hwmon_dev; 532 int ret; 533 534 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) 535 return -ENODEV; 536 537 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); 538 if (!data) 539 return -ENOMEM; 540 541 i2c_set_clientdata(client, data); 542 data->client = client; 543 mutex_init(&data->update_lock); 544 545 ret = ina209_init_client(client, data); 546 if (ret) 547 return ret; 548 549 hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev, 550 client->name, 551 data, ina209_groups); 552 if (IS_ERR(hwmon_dev)) { 553 ret = PTR_ERR(hwmon_dev); 554 goto out_restore_conf; 555 } 556 557 return 0; 558 559 out_restore_conf: 560 ina209_restore_conf(client, data); 561 return ret; 562 } 563 564 static void ina209_remove(struct i2c_client *client) 565 { 566 struct ina209_data *data = i2c_get_clientdata(client); 567 568 ina209_restore_conf(client, data); 569 } 570 571 static const struct i2c_device_id ina209_id[] = { 572 { "ina209" }, 573 { } 574 }; 575 MODULE_DEVICE_TABLE(i2c, ina209_id); 576 577 static const struct of_device_id __maybe_unused ina209_of_match[] = { 578 { .compatible = "ti,ina209" }, 579 { }, 580 }; 581 MODULE_DEVICE_TABLE(of, ina209_of_match); 582 583 /* This is the driver that will be inserted */ 584 static struct i2c_driver ina209_driver = { 585 .driver = { 586 .name = "ina209", 587 .of_match_table = of_match_ptr(ina209_of_match), 588 }, 589 .probe = ina209_probe, 590 .remove = ina209_remove, 591 .id_table = ina209_id, 592 }; 593 594 module_i2c_driver(ina209_driver); 595 596 MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>, Paul Hays <Paul.Hays@cattail.ca>, Guenter Roeck <linux@roeck-us.net>"); 597 MODULE_DESCRIPTION("INA209 driver"); 598 MODULE_LICENSE("GPL"); 599