1 /* 2 * Driver for the Texas Instruments / Burr Brown INA209 3 * Bidirectional Current/Power Monitor 4 * 5 * Copyright (C) 2012 Guenter Roeck <linux@roeck-us.net> 6 * 7 * Derived from Ira W. Snyder's original driver submission 8 * Copyright (C) 2008 Paul Hays <Paul.Hays@cattail.ca> 9 * Copyright (C) 2008-2009 Ira W. Snyder <iws@ovro.caltech.edu> 10 * 11 * Aligned with ina2xx driver 12 * Copyright (C) 2012 Lothar Felten <l-felten@ti.com> 13 * Thanks to Jan Volkering 14 * 15 * This program is free software; you can redistribute it and/or modify 16 * it under the terms of the GNU General Public License as published by 17 * the Free Software Foundation; version 2 of the License. 18 * 19 * Datasheet: 20 * http://www.ti.com/lit/gpn/ina209 21 */ 22 23 #include <linux/kernel.h> 24 #include <linux/module.h> 25 #include <linux/init.h> 26 #include <linux/err.h> 27 #include <linux/slab.h> 28 #include <linux/bug.h> 29 #include <linux/i2c.h> 30 #include <linux/hwmon.h> 31 #include <linux/hwmon-sysfs.h> 32 33 #include <linux/platform_data/ina2xx.h> 34 35 /* register definitions */ 36 #define INA209_CONFIGURATION 0x00 37 #define INA209_STATUS 0x01 38 #define INA209_STATUS_MASK 0x02 39 #define INA209_SHUNT_VOLTAGE 0x03 40 #define INA209_BUS_VOLTAGE 0x04 41 #define INA209_POWER 0x05 42 #define INA209_CURRENT 0x06 43 #define INA209_SHUNT_VOLTAGE_POS_PEAK 0x07 44 #define INA209_SHUNT_VOLTAGE_NEG_PEAK 0x08 45 #define INA209_BUS_VOLTAGE_MAX_PEAK 0x09 46 #define INA209_BUS_VOLTAGE_MIN_PEAK 0x0a 47 #define INA209_POWER_PEAK 0x0b 48 #define INA209_SHUNT_VOLTAGE_POS_WARN 0x0c 49 #define INA209_SHUNT_VOLTAGE_NEG_WARN 0x0d 50 #define INA209_POWER_WARN 0x0e 51 #define INA209_BUS_VOLTAGE_OVER_WARN 0x0f 52 #define INA209_BUS_VOLTAGE_UNDER_WARN 0x10 53 #define INA209_POWER_OVER_LIMIT 0x11 54 #define INA209_BUS_VOLTAGE_OVER_LIMIT 0x12 55 #define INA209_BUS_VOLTAGE_UNDER_LIMIT 0x13 56 #define INA209_CRITICAL_DAC_POS 0x14 57 #define INA209_CRITICAL_DAC_NEG 0x15 58 #define INA209_CALIBRATION 0x16 59 60 #define INA209_REGISTERS 0x17 61 62 #define INA209_CONFIG_DEFAULT 0x3c47 /* PGA=8, full range */ 63 #define INA209_SHUNT_DEFAULT 10000 /* uOhm */ 64 65 struct ina209_data { 66 struct i2c_client *client; 67 68 struct mutex update_lock; 69 bool valid; 70 unsigned long last_updated; /* in jiffies */ 71 72 u16 regs[INA209_REGISTERS]; /* All chip registers */ 73 74 u16 config_orig; /* Original configuration */ 75 u16 calibration_orig; /* Original calibration */ 76 u16 update_interval; 77 }; 78 79 static struct ina209_data *ina209_update_device(struct device *dev) 80 { 81 struct ina209_data *data = dev_get_drvdata(dev); 82 struct i2c_client *client = data->client; 83 struct ina209_data *ret = data; 84 s32 val; 85 int i; 86 87 mutex_lock(&data->update_lock); 88 89 if (!data->valid || 90 time_after(jiffies, data->last_updated + data->update_interval)) { 91 for (i = 0; i < ARRAY_SIZE(data->regs); i++) { 92 val = i2c_smbus_read_word_swapped(client, i); 93 if (val < 0) { 94 ret = ERR_PTR(val); 95 goto abort; 96 } 97 data->regs[i] = val; 98 } 99 data->last_updated = jiffies; 100 data->valid = true; 101 } 102 abort: 103 mutex_unlock(&data->update_lock); 104 return ret; 105 } 106 107 /* 108 * Read a value from a device register and convert it to the 109 * appropriate sysfs units 110 */ 111 static long ina209_from_reg(const u8 reg, const u16 val) 112 { 113 switch (reg) { 114 case INA209_SHUNT_VOLTAGE: 115 case INA209_SHUNT_VOLTAGE_POS_PEAK: 116 case INA209_SHUNT_VOLTAGE_NEG_PEAK: 117 case INA209_SHUNT_VOLTAGE_POS_WARN: 118 case INA209_SHUNT_VOLTAGE_NEG_WARN: 119 /* LSB=10 uV. Convert to mV. */ 120 return DIV_ROUND_CLOSEST(val, 100); 121 122 case INA209_BUS_VOLTAGE: 123 case INA209_BUS_VOLTAGE_MAX_PEAK: 124 case INA209_BUS_VOLTAGE_MIN_PEAK: 125 case INA209_BUS_VOLTAGE_OVER_WARN: 126 case INA209_BUS_VOLTAGE_UNDER_WARN: 127 case INA209_BUS_VOLTAGE_OVER_LIMIT: 128 case INA209_BUS_VOLTAGE_UNDER_LIMIT: 129 /* LSB=4 mV, last 3 bits unused */ 130 return (val >> 3) * 4; 131 132 case INA209_CRITICAL_DAC_POS: 133 /* LSB=1 mV, in the upper 8 bits */ 134 return val >> 8; 135 136 case INA209_CRITICAL_DAC_NEG: 137 /* LSB=1 mV, in the upper 8 bits */ 138 return -1 * (val >> 8); 139 140 case INA209_POWER: 141 case INA209_POWER_PEAK: 142 case INA209_POWER_WARN: 143 case INA209_POWER_OVER_LIMIT: 144 /* LSB=20 mW. Convert to uW */ 145 return val * 20 * 1000L; 146 147 case INA209_CURRENT: 148 /* LSB=1 mA (selected). Is in mA */ 149 return val; 150 } 151 152 /* programmer goofed */ 153 WARN_ON_ONCE(1); 154 return 0; 155 } 156 157 /* 158 * Take a value and convert it to register format, clamping the value 159 * to the appropriate range. 160 */ 161 static int ina209_to_reg(u8 reg, u16 old, long val) 162 { 163 switch (reg) { 164 case INA209_SHUNT_VOLTAGE_POS_WARN: 165 case INA209_SHUNT_VOLTAGE_NEG_WARN: 166 /* Limit to +- 320 mV, 10 uV LSB */ 167 return clamp_val(val, -320, 320) * 100; 168 169 case INA209_BUS_VOLTAGE_OVER_WARN: 170 case INA209_BUS_VOLTAGE_UNDER_WARN: 171 case INA209_BUS_VOLTAGE_OVER_LIMIT: 172 case INA209_BUS_VOLTAGE_UNDER_LIMIT: 173 /* 174 * Limit to 0-32000 mV, 4 mV LSB 175 * 176 * The last three bits aren't part of the value, but we'll 177 * preserve them in their original state. 178 */ 179 return (DIV_ROUND_CLOSEST(clamp_val(val, 0, 32000), 4) << 3) 180 | (old & 0x7); 181 182 case INA209_CRITICAL_DAC_NEG: 183 /* 184 * Limit to -255-0 mV, 1 mV LSB 185 * Convert the value to a positive value for the register 186 * 187 * The value lives in the top 8 bits only, be careful 188 * and keep original value of other bits. 189 */ 190 return (clamp_val(-val, 0, 255) << 8) | (old & 0xff); 191 192 case INA209_CRITICAL_DAC_POS: 193 /* 194 * Limit to 0-255 mV, 1 mV LSB 195 * 196 * The value lives in the top 8 bits only, be careful 197 * and keep original value of other bits. 198 */ 199 return (clamp_val(val, 0, 255) << 8) | (old & 0xff); 200 201 case INA209_POWER_WARN: 202 case INA209_POWER_OVER_LIMIT: 203 /* 20 mW LSB */ 204 return DIV_ROUND_CLOSEST(val, 20 * 1000); 205 } 206 207 /* Other registers are read-only, return access error */ 208 return -EACCES; 209 } 210 211 static int ina209_interval_from_reg(u16 reg) 212 { 213 return 68 >> (15 - ((reg >> 3) & 0x0f)); 214 } 215 216 static u16 ina209_reg_from_interval(u16 config, long interval) 217 { 218 int i, adc; 219 220 if (interval <= 0) { 221 adc = 8; 222 } else { 223 adc = 15; 224 for (i = 34 + 34 / 2; i; i >>= 1) { 225 if (i < interval) 226 break; 227 adc--; 228 } 229 } 230 return (config & 0xf807) | (adc << 3) | (adc << 7); 231 } 232 233 static ssize_t ina209_set_interval(struct device *dev, 234 struct device_attribute *da, 235 const char *buf, size_t count) 236 { 237 struct ina209_data *data = ina209_update_device(dev); 238 long val; 239 u16 regval; 240 int ret; 241 242 if (IS_ERR(data)) 243 return PTR_ERR(data); 244 245 ret = kstrtol(buf, 10, &val); 246 if (ret < 0) 247 return ret; 248 249 mutex_lock(&data->update_lock); 250 regval = ina209_reg_from_interval(data->regs[INA209_CONFIGURATION], 251 val); 252 i2c_smbus_write_word_swapped(data->client, INA209_CONFIGURATION, 253 regval); 254 data->regs[INA209_CONFIGURATION] = regval; 255 data->update_interval = ina209_interval_from_reg(regval); 256 mutex_unlock(&data->update_lock); 257 return count; 258 } 259 260 static ssize_t ina209_show_interval(struct device *dev, 261 struct device_attribute *da, char *buf) 262 { 263 struct ina209_data *data = dev_get_drvdata(dev); 264 265 return snprintf(buf, PAGE_SIZE, "%d\n", data->update_interval); 266 } 267 268 /* 269 * History is reset by writing 1 into bit 0 of the respective peak register. 270 * Since more than one peak register may be affected by the scope of a 271 * reset_history attribute write, use a bit mask in attr->index to identify 272 * which registers are affected. 273 */ 274 static u16 ina209_reset_history_regs[] = { 275 INA209_SHUNT_VOLTAGE_POS_PEAK, 276 INA209_SHUNT_VOLTAGE_NEG_PEAK, 277 INA209_BUS_VOLTAGE_MAX_PEAK, 278 INA209_BUS_VOLTAGE_MIN_PEAK, 279 INA209_POWER_PEAK 280 }; 281 282 static ssize_t ina209_reset_history(struct device *dev, 283 struct device_attribute *da, 284 const char *buf, 285 size_t count) 286 { 287 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 288 struct ina209_data *data = dev_get_drvdata(dev); 289 struct i2c_client *client = data->client; 290 u32 mask = attr->index; 291 long val; 292 int i, ret; 293 294 ret = kstrtol(buf, 10, &val); 295 if (ret < 0) 296 return ret; 297 298 mutex_lock(&data->update_lock); 299 for (i = 0; i < ARRAY_SIZE(ina209_reset_history_regs); i++) { 300 if (mask & (1 << i)) 301 i2c_smbus_write_word_swapped(client, 302 ina209_reset_history_regs[i], 1); 303 } 304 data->valid = false; 305 mutex_unlock(&data->update_lock); 306 return count; 307 } 308 309 static ssize_t ina209_set_value(struct device *dev, 310 struct device_attribute *da, 311 const char *buf, 312 size_t count) 313 { 314 struct ina209_data *data = ina209_update_device(dev); 315 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 316 int reg = attr->index; 317 long val; 318 int ret; 319 320 if (IS_ERR(data)) 321 return PTR_ERR(data); 322 323 ret = kstrtol(buf, 10, &val); 324 if (ret < 0) 325 return ret; 326 327 mutex_lock(&data->update_lock); 328 ret = ina209_to_reg(reg, data->regs[reg], val); 329 if (ret < 0) { 330 count = ret; 331 goto abort; 332 } 333 i2c_smbus_write_word_swapped(data->client, reg, ret); 334 data->regs[reg] = ret; 335 abort: 336 mutex_unlock(&data->update_lock); 337 return count; 338 } 339 340 static ssize_t ina209_show_value(struct device *dev, 341 struct device_attribute *da, 342 char *buf) 343 { 344 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 345 struct ina209_data *data = ina209_update_device(dev); 346 long val; 347 348 if (IS_ERR(data)) 349 return PTR_ERR(data); 350 351 val = ina209_from_reg(attr->index, data->regs[attr->index]); 352 return snprintf(buf, PAGE_SIZE, "%ld\n", val); 353 } 354 355 static ssize_t ina209_show_alarm(struct device *dev, 356 struct device_attribute *da, 357 char *buf) 358 { 359 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 360 struct ina209_data *data = ina209_update_device(dev); 361 const unsigned int mask = attr->index; 362 u16 status; 363 364 if (IS_ERR(data)) 365 return PTR_ERR(data); 366 367 status = data->regs[INA209_STATUS]; 368 369 /* 370 * All alarms are in the INA209_STATUS register. To avoid a long 371 * switch statement, the mask is passed in attr->index 372 */ 373 return snprintf(buf, PAGE_SIZE, "%u\n", !!(status & mask)); 374 } 375 376 /* Shunt voltage, history, limits, alarms */ 377 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, ina209_show_value, NULL, 378 INA209_SHUNT_VOLTAGE); 379 static SENSOR_DEVICE_ATTR(in0_input_highest, S_IRUGO, ina209_show_value, NULL, 380 INA209_SHUNT_VOLTAGE_POS_PEAK); 381 static SENSOR_DEVICE_ATTR(in0_input_lowest, S_IRUGO, ina209_show_value, NULL, 382 INA209_SHUNT_VOLTAGE_NEG_PEAK); 383 static SENSOR_DEVICE_ATTR(in0_reset_history, S_IWUSR, NULL, 384 ina209_reset_history, (1 << 0) | (1 << 1)); 385 static SENSOR_DEVICE_ATTR(in0_max, S_IRUGO | S_IWUSR, ina209_show_value, 386 ina209_set_value, INA209_SHUNT_VOLTAGE_POS_WARN); 387 static SENSOR_DEVICE_ATTR(in0_min, S_IRUGO | S_IWUSR, ina209_show_value, 388 ina209_set_value, INA209_SHUNT_VOLTAGE_NEG_WARN); 389 static SENSOR_DEVICE_ATTR(in0_crit_max, S_IRUGO | S_IWUSR, ina209_show_value, 390 ina209_set_value, INA209_CRITICAL_DAC_POS); 391 static SENSOR_DEVICE_ATTR(in0_crit_min, S_IRUGO | S_IWUSR, ina209_show_value, 392 ina209_set_value, INA209_CRITICAL_DAC_NEG); 393 394 static SENSOR_DEVICE_ATTR(in0_min_alarm, S_IRUGO, ina209_show_alarm, NULL, 395 1 << 11); 396 static SENSOR_DEVICE_ATTR(in0_max_alarm, S_IRUGO, ina209_show_alarm, NULL, 397 1 << 12); 398 static SENSOR_DEVICE_ATTR(in0_crit_min_alarm, S_IRUGO, ina209_show_alarm, NULL, 399 1 << 6); 400 static SENSOR_DEVICE_ATTR(in0_crit_max_alarm, S_IRUGO, ina209_show_alarm, NULL, 401 1 << 7); 402 403 /* Bus voltage, history, limits, alarms */ 404 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ina209_show_value, NULL, 405 INA209_BUS_VOLTAGE); 406 static SENSOR_DEVICE_ATTR(in1_input_highest, S_IRUGO, ina209_show_value, NULL, 407 INA209_BUS_VOLTAGE_MAX_PEAK); 408 static SENSOR_DEVICE_ATTR(in1_input_lowest, S_IRUGO, ina209_show_value, NULL, 409 INA209_BUS_VOLTAGE_MIN_PEAK); 410 static SENSOR_DEVICE_ATTR(in1_reset_history, S_IWUSR, NULL, 411 ina209_reset_history, (1 << 2) | (1 << 3)); 412 static SENSOR_DEVICE_ATTR(in1_max, S_IRUGO | S_IWUSR, ina209_show_value, 413 ina209_set_value, INA209_BUS_VOLTAGE_OVER_WARN); 414 static SENSOR_DEVICE_ATTR(in1_min, S_IRUGO | S_IWUSR, ina209_show_value, 415 ina209_set_value, INA209_BUS_VOLTAGE_UNDER_WARN); 416 static SENSOR_DEVICE_ATTR(in1_crit_max, S_IRUGO | S_IWUSR, ina209_show_value, 417 ina209_set_value, INA209_BUS_VOLTAGE_OVER_LIMIT); 418 static SENSOR_DEVICE_ATTR(in1_crit_min, S_IRUGO | S_IWUSR, ina209_show_value, 419 ina209_set_value, INA209_BUS_VOLTAGE_UNDER_LIMIT); 420 421 static SENSOR_DEVICE_ATTR(in1_min_alarm, S_IRUGO, ina209_show_alarm, NULL, 422 1 << 14); 423 static SENSOR_DEVICE_ATTR(in1_max_alarm, S_IRUGO, ina209_show_alarm, NULL, 424 1 << 15); 425 static SENSOR_DEVICE_ATTR(in1_crit_min_alarm, S_IRUGO, ina209_show_alarm, NULL, 426 1 << 9); 427 static SENSOR_DEVICE_ATTR(in1_crit_max_alarm, S_IRUGO, ina209_show_alarm, NULL, 428 1 << 10); 429 430 /* Power */ 431 static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ina209_show_value, NULL, 432 INA209_POWER); 433 static SENSOR_DEVICE_ATTR(power1_input_highest, S_IRUGO, ina209_show_value, 434 NULL, INA209_POWER_PEAK); 435 static SENSOR_DEVICE_ATTR(power1_reset_history, S_IWUSR, NULL, 436 ina209_reset_history, 1 << 4); 437 static SENSOR_DEVICE_ATTR(power1_max, S_IRUGO | S_IWUSR, ina209_show_value, 438 ina209_set_value, INA209_POWER_WARN); 439 static SENSOR_DEVICE_ATTR(power1_crit, S_IRUGO | S_IWUSR, ina209_show_value, 440 ina209_set_value, INA209_POWER_OVER_LIMIT); 441 442 static SENSOR_DEVICE_ATTR(power1_max_alarm, S_IRUGO, ina209_show_alarm, NULL, 443 1 << 13); 444 static SENSOR_DEVICE_ATTR(power1_crit_alarm, S_IRUGO, ina209_show_alarm, NULL, 445 1 << 8); 446 447 /* Current */ 448 static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ina209_show_value, NULL, 449 INA209_CURRENT); 450 451 static SENSOR_DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, 452 ina209_show_interval, ina209_set_interval, 0); 453 454 /* 455 * Finally, construct an array of pointers to members of the above objects, 456 * as required for sysfs_create_group() 457 */ 458 static struct attribute *ina209_attrs[] = { 459 &sensor_dev_attr_in0_input.dev_attr.attr, 460 &sensor_dev_attr_in0_input_highest.dev_attr.attr, 461 &sensor_dev_attr_in0_input_lowest.dev_attr.attr, 462 &sensor_dev_attr_in0_reset_history.dev_attr.attr, 463 &sensor_dev_attr_in0_max.dev_attr.attr, 464 &sensor_dev_attr_in0_min.dev_attr.attr, 465 &sensor_dev_attr_in0_crit_max.dev_attr.attr, 466 &sensor_dev_attr_in0_crit_min.dev_attr.attr, 467 &sensor_dev_attr_in0_max_alarm.dev_attr.attr, 468 &sensor_dev_attr_in0_min_alarm.dev_attr.attr, 469 &sensor_dev_attr_in0_crit_max_alarm.dev_attr.attr, 470 &sensor_dev_attr_in0_crit_min_alarm.dev_attr.attr, 471 472 &sensor_dev_attr_in1_input.dev_attr.attr, 473 &sensor_dev_attr_in1_input_highest.dev_attr.attr, 474 &sensor_dev_attr_in1_input_lowest.dev_attr.attr, 475 &sensor_dev_attr_in1_reset_history.dev_attr.attr, 476 &sensor_dev_attr_in1_max.dev_attr.attr, 477 &sensor_dev_attr_in1_min.dev_attr.attr, 478 &sensor_dev_attr_in1_crit_max.dev_attr.attr, 479 &sensor_dev_attr_in1_crit_min.dev_attr.attr, 480 &sensor_dev_attr_in1_max_alarm.dev_attr.attr, 481 &sensor_dev_attr_in1_min_alarm.dev_attr.attr, 482 &sensor_dev_attr_in1_crit_max_alarm.dev_attr.attr, 483 &sensor_dev_attr_in1_crit_min_alarm.dev_attr.attr, 484 485 &sensor_dev_attr_power1_input.dev_attr.attr, 486 &sensor_dev_attr_power1_input_highest.dev_attr.attr, 487 &sensor_dev_attr_power1_reset_history.dev_attr.attr, 488 &sensor_dev_attr_power1_max.dev_attr.attr, 489 &sensor_dev_attr_power1_crit.dev_attr.attr, 490 &sensor_dev_attr_power1_max_alarm.dev_attr.attr, 491 &sensor_dev_attr_power1_crit_alarm.dev_attr.attr, 492 493 &sensor_dev_attr_curr1_input.dev_attr.attr, 494 495 &sensor_dev_attr_update_interval.dev_attr.attr, 496 497 NULL, 498 }; 499 ATTRIBUTE_GROUPS(ina209); 500 501 static void ina209_restore_conf(struct i2c_client *client, 502 struct ina209_data *data) 503 { 504 /* Restore initial configuration */ 505 i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION, 506 data->config_orig); 507 i2c_smbus_write_word_swapped(client, INA209_CALIBRATION, 508 data->calibration_orig); 509 } 510 511 static int ina209_init_client(struct i2c_client *client, 512 struct ina209_data *data) 513 { 514 struct ina2xx_platform_data *pdata = dev_get_platdata(&client->dev); 515 u32 shunt; 516 int reg; 517 518 reg = i2c_smbus_read_word_swapped(client, INA209_CALIBRATION); 519 if (reg < 0) 520 return reg; 521 data->calibration_orig = reg; 522 523 reg = i2c_smbus_read_word_swapped(client, INA209_CONFIGURATION); 524 if (reg < 0) 525 return reg; 526 data->config_orig = reg; 527 528 if (pdata) { 529 if (pdata->shunt_uohms <= 0) 530 return -EINVAL; 531 shunt = pdata->shunt_uohms; 532 } else if (!of_property_read_u32(client->dev.of_node, "shunt-resistor", 533 &shunt)) { 534 if (shunt == 0) 535 return -EINVAL; 536 } else { 537 shunt = data->calibration_orig ? 538 40960000 / data->calibration_orig : INA209_SHUNT_DEFAULT; 539 } 540 541 i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION, 542 INA209_CONFIG_DEFAULT); 543 data->update_interval = ina209_interval_from_reg(INA209_CONFIG_DEFAULT); 544 545 /* 546 * Calibrate current LSB to 1mA. Shunt is in uOhms. 547 * See equation 13 in datasheet. 548 */ 549 i2c_smbus_write_word_swapped(client, INA209_CALIBRATION, 550 clamp_val(40960000 / shunt, 1, 65535)); 551 552 /* Clear status register */ 553 i2c_smbus_read_word_swapped(client, INA209_STATUS); 554 555 return 0; 556 } 557 558 static int ina209_probe(struct i2c_client *client, 559 const struct i2c_device_id *id) 560 { 561 struct i2c_adapter *adapter = client->adapter; 562 struct ina209_data *data; 563 struct device *hwmon_dev; 564 int ret; 565 566 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) 567 return -ENODEV; 568 569 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); 570 if (!data) 571 return -ENOMEM; 572 573 i2c_set_clientdata(client, data); 574 data->client = client; 575 mutex_init(&data->update_lock); 576 577 ret = ina209_init_client(client, data); 578 if (ret) 579 return ret; 580 581 hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev, 582 client->name, 583 data, ina209_groups); 584 if (IS_ERR(hwmon_dev)) { 585 ret = PTR_ERR(hwmon_dev); 586 goto out_restore_conf; 587 } 588 589 return 0; 590 591 out_restore_conf: 592 ina209_restore_conf(client, data); 593 return ret; 594 } 595 596 static int ina209_remove(struct i2c_client *client) 597 { 598 struct ina209_data *data = i2c_get_clientdata(client); 599 600 ina209_restore_conf(client, data); 601 602 return 0; 603 } 604 605 static const struct i2c_device_id ina209_id[] = { 606 { "ina209", 0 }, 607 { } 608 }; 609 MODULE_DEVICE_TABLE(i2c, ina209_id); 610 611 /* This is the driver that will be inserted */ 612 static struct i2c_driver ina209_driver = { 613 .class = I2C_CLASS_HWMON, 614 .driver = { 615 .name = "ina209", 616 }, 617 .probe = ina209_probe, 618 .remove = ina209_remove, 619 .id_table = ina209_id, 620 }; 621 622 module_i2c_driver(ina209_driver); 623 624 MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>, Paul Hays <Paul.Hays@cattail.ca>, Guenter Roeck <linux@roeck-us.net>"); 625 MODULE_DESCRIPTION("INA209 driver"); 626 MODULE_LICENSE("GPL"); 627