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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 | // SPDX-License-Identifier: GPL-2.0-or-later /* * Driver for Linear Technology LTC2945 I2C Power Monitor * * Copyright (c) 2014 Guenter Roeck */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/err.h> #include <linux/slab.h> #include <linux/i2c.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/jiffies.h> #include <linux/regmap.h> /* chip registers */ #define LTC2945_CONTROL 0x00 #define LTC2945_ALERT 0x01 #define LTC2945_STATUS 0x02 #define LTC2945_FAULT 0x03 #define LTC2945_POWER_H 0x05 #define LTC2945_MAX_POWER_H 0x08 #define LTC2945_MIN_POWER_H 0x0b #define LTC2945_MAX_POWER_THRES_H 0x0e #define LTC2945_MIN_POWER_THRES_H 0x11 #define LTC2945_SENSE_H 0x14 #define LTC2945_MAX_SENSE_H 0x16 #define LTC2945_MIN_SENSE_H 0x18 #define LTC2945_MAX_SENSE_THRES_H 0x1a #define LTC2945_MIN_SENSE_THRES_H 0x1c #define LTC2945_VIN_H 0x1e #define LTC2945_MAX_VIN_H 0x20 #define LTC2945_MIN_VIN_H 0x22 #define LTC2945_MAX_VIN_THRES_H 0x24 #define LTC2945_MIN_VIN_THRES_H 0x26 #define LTC2945_ADIN_H 0x28 #define LTC2945_MAX_ADIN_H 0x2a #define LTC2945_MIN_ADIN_H 0x2c #define LTC2945_MAX_ADIN_THRES_H 0x2e #define LTC2945_MIN_ADIN_THRES_H 0x30 #define LTC2945_MIN_ADIN_THRES_L 0x31 /* Fault register bits */ #define FAULT_ADIN_UV (1 << 0) #define FAULT_ADIN_OV (1 << 1) #define FAULT_VIN_UV (1 << 2) #define FAULT_VIN_OV (1 << 3) #define FAULT_SENSE_UV (1 << 4) #define FAULT_SENSE_OV (1 << 5) #define FAULT_POWER_UV (1 << 6) #define FAULT_POWER_OV (1 << 7) /* Control register bits */ #define CONTROL_MULT_SELECT (1 << 0) #define CONTROL_TEST_MODE (1 << 4) static inline bool is_power_reg(u8 reg) { return reg < LTC2945_SENSE_H; } /* Return the value from the given register in uW, mV, or mA */ static long long ltc2945_reg_to_val(struct device *dev, u8 reg) { struct regmap *regmap = dev_get_drvdata(dev); unsigned int control; u8 buf[3]; long long val; int ret; ret = regmap_bulk_read(regmap, reg, buf, is_power_reg(reg) ? 3 : 2); if (ret < 0) return ret; if (is_power_reg(reg)) { /* power */ val = (buf[0] << 16) + (buf[1] << 8) + buf[2]; } else { /* current, voltage */ val = (buf[0] << 4) + (buf[1] >> 4); } switch (reg) { case LTC2945_POWER_H: case LTC2945_MAX_POWER_H: case LTC2945_MIN_POWER_H: case LTC2945_MAX_POWER_THRES_H: case LTC2945_MIN_POWER_THRES_H: /* * Convert to uW by assuming current is measured with * an 1mOhm sense resistor, similar to current * measurements. * Control register bit 0 selects if voltage at SENSE+/VDD * or voltage at ADIN is used to measure power. */ ret = regmap_read(regmap, LTC2945_CONTROL, &control); if (ret < 0) return ret; if (control & CONTROL_MULT_SELECT) { /* 25 mV * 25 uV = 0.625 uV resolution. */ val *= 625LL; } else { /* 0.5 mV * 25 uV = 0.0125 uV resolution. */ val = (val * 25LL) >> 1; } break; case LTC2945_VIN_H: case LTC2945_MAX_VIN_H: case LTC2945_MIN_VIN_H: case LTC2945_MAX_VIN_THRES_H: case LTC2945_MIN_VIN_THRES_H: /* 25 mV resolution. Convert to mV. */ val *= 25; break; case LTC2945_ADIN_H: case LTC2945_MAX_ADIN_H: case LTC2945_MIN_ADIN_THRES_H: case LTC2945_MAX_ADIN_THRES_H: case LTC2945_MIN_ADIN_H: /* 0.5mV resolution. Convert to mV. */ val = val >> 1; break; case LTC2945_SENSE_H: case LTC2945_MAX_SENSE_H: case LTC2945_MIN_SENSE_H: case LTC2945_MAX_SENSE_THRES_H: case LTC2945_MIN_SENSE_THRES_H: /* * 25 uV resolution. Convert to current as measured with * an 1 mOhm sense resistor, in mA. If a different sense * resistor is installed, calculate the actual current by * dividing the reported current by the sense resistor value * in mOhm. */ val *= 25; break; default: return -EINVAL; } return val; } static int ltc2945_val_to_reg(struct device *dev, u8 reg, unsigned long val) { struct regmap *regmap = dev_get_drvdata(dev); unsigned int control; int ret; switch (reg) { case LTC2945_POWER_H: case LTC2945_MAX_POWER_H: case LTC2945_MIN_POWER_H: case LTC2945_MAX_POWER_THRES_H: case LTC2945_MIN_POWER_THRES_H: /* * Convert to register value by assuming current is measured * with an 1mOhm sense resistor, similar to current * measurements. * Control register bit 0 selects if voltage at SENSE+/VDD * or voltage at ADIN is used to measure power, which in turn * determines register calculations. */ ret = regmap_read(regmap, LTC2945_CONTROL, &control); if (ret < 0) return ret; if (control & CONTROL_MULT_SELECT) { /* 25 mV * 25 uV = 0.625 uV resolution. */ val = DIV_ROUND_CLOSEST(val, 625); } else { /* * 0.5 mV * 25 uV = 0.0125 uV resolution. * Divide first to avoid overflow; * accept loss of accuracy. */ val = DIV_ROUND_CLOSEST(val, 25) * 2; } break; case LTC2945_VIN_H: case LTC2945_MAX_VIN_H: case LTC2945_MIN_VIN_H: case LTC2945_MAX_VIN_THRES_H: case LTC2945_MIN_VIN_THRES_H: /* 25 mV resolution. */ val /= 25; break; case LTC2945_ADIN_H: case LTC2945_MAX_ADIN_H: case LTC2945_MIN_ADIN_THRES_H: case LTC2945_MAX_ADIN_THRES_H: case LTC2945_MIN_ADIN_H: /* 0.5mV resolution. */ val *= 2; break; case LTC2945_SENSE_H: case LTC2945_MAX_SENSE_H: case LTC2945_MIN_SENSE_H: case LTC2945_MAX_SENSE_THRES_H: case LTC2945_MIN_SENSE_THRES_H: /* * 25 uV resolution. Convert to current as measured with * an 1 mOhm sense resistor, in mA. If a different sense * resistor is installed, calculate the actual current by * dividing the reported current by the sense resistor value * in mOhm. */ val = DIV_ROUND_CLOSEST(val, 25); break; default: return -EINVAL; } return val; } static ssize_t ltc2945_value_show(struct device *dev, struct device_attribute *da, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); long long value; value = ltc2945_reg_to_val(dev, attr->index); if (value < 0) return value; return snprintf(buf, PAGE_SIZE, "%lld\n", value); } static ssize_t ltc2945_value_store(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct regmap *regmap = dev_get_drvdata(dev); u8 reg = attr->index; unsigned long val; u8 regbuf[3]; int num_regs; int regval; int ret; ret = kstrtoul(buf, 10, &val); if (ret) return ret; /* convert to register value, then clamp and write result */ regval = ltc2945_val_to_reg(dev, reg, val); if (is_power_reg(reg)) { regval = clamp_val(regval, 0, 0xffffff); regbuf[0] = regval >> 16; regbuf[1] = (regval >> 8) & 0xff; regbuf[2] = regval; num_regs = 3; } else { regval = clamp_val(regval, 0, 0xfff) << 4; regbuf[0] = regval >> 8; regbuf[1] = regval & 0xff; num_regs = 2; } ret = regmap_bulk_write(regmap, reg, regbuf, num_regs); return ret < 0 ? ret : count; } static ssize_t ltc2945_history_store(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct regmap *regmap = dev_get_drvdata(dev); u8 reg = attr->index; int num_regs = is_power_reg(reg) ? 3 : 2; u8 buf_min[3] = { 0xff, 0xff, 0xff }; u8 buf_max[3] = { 0, 0, 0 }; unsigned long val; int ret; ret = kstrtoul(buf, 10, &val); if (ret) return ret; if (val != 1) return -EINVAL; ret = regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE, CONTROL_TEST_MODE); /* Reset minimum */ ret = regmap_bulk_write(regmap, reg, buf_min, num_regs); if (ret) return ret; switch (reg) { case LTC2945_MIN_POWER_H: reg = LTC2945_MAX_POWER_H; break; case LTC2945_MIN_SENSE_H: reg = LTC2945_MAX_SENSE_H; break; case LTC2945_MIN_VIN_H: reg = LTC2945_MAX_VIN_H; break; case LTC2945_MIN_ADIN_H: reg = LTC2945_MAX_ADIN_H; break; default: WARN_ONCE(1, "Bad register: 0x%x\n", reg); return -EINVAL; } /* Reset maximum */ ret = regmap_bulk_write(regmap, reg, buf_max, num_regs); /* Try resetting test mode even if there was an error */ regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE, 0); return ret ? : count; } static ssize_t ltc2945_bool_show(struct device *dev, struct device_attribute *da, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct regmap *regmap = dev_get_drvdata(dev); unsigned int fault; int ret; ret = regmap_read(regmap, LTC2945_FAULT, &fault); if (ret < 0) return ret; fault &= attr->index; if (fault) /* Clear reported faults in chip register */ regmap_update_bits(regmap, LTC2945_FAULT, attr->index, 0); return snprintf(buf, PAGE_SIZE, "%d\n", !!fault); } /* Input voltages */ static SENSOR_DEVICE_ATTR_RO(in1_input, ltc2945_value, LTC2945_VIN_H); static SENSOR_DEVICE_ATTR_RW(in1_min, ltc2945_value, LTC2945_MIN_VIN_THRES_H); static SENSOR_DEVICE_ATTR_RW(in1_max, ltc2945_value, LTC2945_MAX_VIN_THRES_H); static SENSOR_DEVICE_ATTR_RO(in1_lowest, ltc2945_value, LTC2945_MIN_VIN_H); static SENSOR_DEVICE_ATTR_RO(in1_highest, ltc2945_value, LTC2945_MAX_VIN_H); static SENSOR_DEVICE_ATTR_WO(in1_reset_history, ltc2945_history, LTC2945_MIN_VIN_H); static SENSOR_DEVICE_ATTR_RO(in2_input, ltc2945_value, LTC2945_ADIN_H); static SENSOR_DEVICE_ATTR_RW(in2_min, ltc2945_value, LTC2945_MIN_ADIN_THRES_H); static SENSOR_DEVICE_ATTR_RW(in2_max, ltc2945_value, LTC2945_MAX_ADIN_THRES_H); static SENSOR_DEVICE_ATTR_RO(in2_lowest, ltc2945_value, LTC2945_MIN_ADIN_H); static SENSOR_DEVICE_ATTR_RO(in2_highest, ltc2945_value, LTC2945_MAX_ADIN_H); static SENSOR_DEVICE_ATTR_WO(in2_reset_history, ltc2945_history, LTC2945_MIN_ADIN_H); /* Voltage alarms */ static SENSOR_DEVICE_ATTR_RO(in1_min_alarm, ltc2945_bool, FAULT_VIN_UV); static SENSOR_DEVICE_ATTR_RO(in1_max_alarm, ltc2945_bool, FAULT_VIN_OV); static SENSOR_DEVICE_ATTR_RO(in2_min_alarm, ltc2945_bool, FAULT_ADIN_UV); static SENSOR_DEVICE_ATTR_RO(in2_max_alarm, ltc2945_bool, FAULT_ADIN_OV); /* Currents (via sense resistor) */ static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc2945_value, LTC2945_SENSE_H); static SENSOR_DEVICE_ATTR_RW(curr1_min, ltc2945_value, LTC2945_MIN_SENSE_THRES_H); static SENSOR_DEVICE_ATTR_RW(curr1_max, ltc2945_value, LTC2945_MAX_SENSE_THRES_H); static SENSOR_DEVICE_ATTR_RO(curr1_lowest, ltc2945_value, LTC2945_MIN_SENSE_H); static SENSOR_DEVICE_ATTR_RO(curr1_highest, ltc2945_value, LTC2945_MAX_SENSE_H); static SENSOR_DEVICE_ATTR_WO(curr1_reset_history, ltc2945_history, LTC2945_MIN_SENSE_H); /* Current alarms */ static SENSOR_DEVICE_ATTR_RO(curr1_min_alarm, ltc2945_bool, FAULT_SENSE_UV); static SENSOR_DEVICE_ATTR_RO(curr1_max_alarm, ltc2945_bool, FAULT_SENSE_OV); /* Power */ static SENSOR_DEVICE_ATTR_RO(power1_input, ltc2945_value, LTC2945_POWER_H); static SENSOR_DEVICE_ATTR_RW(power1_min, ltc2945_value, LTC2945_MIN_POWER_THRES_H); static SENSOR_DEVICE_ATTR_RW(power1_max, ltc2945_value, LTC2945_MAX_POWER_THRES_H); static SENSOR_DEVICE_ATTR_RO(power1_input_lowest, ltc2945_value, LTC2945_MIN_POWER_H); static SENSOR_DEVICE_ATTR_RO(power1_input_highest, ltc2945_value, LTC2945_MAX_POWER_H); static SENSOR_DEVICE_ATTR_WO(power1_reset_history, ltc2945_history, LTC2945_MIN_POWER_H); /* Power alarms */ static SENSOR_DEVICE_ATTR_RO(power1_min_alarm, ltc2945_bool, FAULT_POWER_UV); static SENSOR_DEVICE_ATTR_RO(power1_max_alarm, ltc2945_bool, FAULT_POWER_OV); static struct attribute *ltc2945_attrs[] = { &sensor_dev_attr_in1_input.dev_attr.attr, &sensor_dev_attr_in1_min.dev_attr.attr, &sensor_dev_attr_in1_max.dev_attr.attr, &sensor_dev_attr_in1_lowest.dev_attr.attr, &sensor_dev_attr_in1_highest.dev_attr.attr, &sensor_dev_attr_in1_reset_history.dev_attr.attr, &sensor_dev_attr_in1_min_alarm.dev_attr.attr, &sensor_dev_attr_in1_max_alarm.dev_attr.attr, &sensor_dev_attr_in2_input.dev_attr.attr, &sensor_dev_attr_in2_min.dev_attr.attr, &sensor_dev_attr_in2_max.dev_attr.attr, &sensor_dev_attr_in2_lowest.dev_attr.attr, &sensor_dev_attr_in2_highest.dev_attr.attr, &sensor_dev_attr_in2_reset_history.dev_attr.attr, &sensor_dev_attr_in2_min_alarm.dev_attr.attr, &sensor_dev_attr_in2_max_alarm.dev_attr.attr, &sensor_dev_attr_curr1_input.dev_attr.attr, &sensor_dev_attr_curr1_min.dev_attr.attr, &sensor_dev_attr_curr1_max.dev_attr.attr, &sensor_dev_attr_curr1_lowest.dev_attr.attr, &sensor_dev_attr_curr1_highest.dev_attr.attr, &sensor_dev_attr_curr1_reset_history.dev_attr.attr, &sensor_dev_attr_curr1_min_alarm.dev_attr.attr, &sensor_dev_attr_curr1_max_alarm.dev_attr.attr, &sensor_dev_attr_power1_input.dev_attr.attr, &sensor_dev_attr_power1_min.dev_attr.attr, &sensor_dev_attr_power1_max.dev_attr.attr, &sensor_dev_attr_power1_input_lowest.dev_attr.attr, &sensor_dev_attr_power1_input_highest.dev_attr.attr, &sensor_dev_attr_power1_reset_history.dev_attr.attr, &sensor_dev_attr_power1_min_alarm.dev_attr.attr, &sensor_dev_attr_power1_max_alarm.dev_attr.attr, NULL, }; ATTRIBUTE_GROUPS(ltc2945); static const struct regmap_config ltc2945_regmap_config = { .reg_bits = 8, .val_bits = 8, .max_register = LTC2945_MIN_ADIN_THRES_L, }; static int ltc2945_probe(struct i2c_client *client) { struct device *dev = &client->dev; struct device *hwmon_dev; struct regmap *regmap; regmap = devm_regmap_init_i2c(client, <c2945_regmap_config); if (IS_ERR(regmap)) { dev_err(dev, "failed to allocate register map\n"); return PTR_ERR(regmap); } /* Clear faults */ regmap_write(regmap, LTC2945_FAULT, 0x00); hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, regmap, ltc2945_groups); return PTR_ERR_OR_ZERO(hwmon_dev); } static const struct i2c_device_id ltc2945_id[] = { {"ltc2945", 0}, { } }; MODULE_DEVICE_TABLE(i2c, ltc2945_id); static struct i2c_driver ltc2945_driver = { .driver = { .name = "ltc2945", }, .probe_new = ltc2945_probe, .id_table = ltc2945_id, }; module_i2c_driver(ltc2945_driver); MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); MODULE_DESCRIPTION("LTC2945 driver"); MODULE_LICENSE("GPL"); |