Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Driver for Linear Technology LTC2945 I2C Power Monitor |
| 3 | * |
| 4 | * Copyright (c) 2014 Guenter Roeck |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | */ |
| 16 | |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/err.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/i2c.h> |
| 22 | #include <linux/hwmon.h> |
| 23 | #include <linux/hwmon-sysfs.h> |
| 24 | #include <linux/jiffies.h> |
| 25 | #include <linux/regmap.h> |
| 26 | |
| 27 | /* chip registers */ |
| 28 | #define LTC2945_CONTROL 0x00 |
| 29 | #define LTC2945_ALERT 0x01 |
| 30 | #define LTC2945_STATUS 0x02 |
| 31 | #define LTC2945_FAULT 0x03 |
| 32 | #define LTC2945_POWER_H 0x05 |
| 33 | #define LTC2945_MAX_POWER_H 0x08 |
| 34 | #define LTC2945_MIN_POWER_H 0x0b |
| 35 | #define LTC2945_MAX_POWER_THRES_H 0x0e |
| 36 | #define LTC2945_MIN_POWER_THRES_H 0x11 |
| 37 | #define LTC2945_SENSE_H 0x14 |
| 38 | #define LTC2945_MAX_SENSE_H 0x16 |
| 39 | #define LTC2945_MIN_SENSE_H 0x18 |
| 40 | #define LTC2945_MAX_SENSE_THRES_H 0x1a |
| 41 | #define LTC2945_MIN_SENSE_THRES_H 0x1c |
| 42 | #define LTC2945_VIN_H 0x1e |
| 43 | #define LTC2945_MAX_VIN_H 0x20 |
| 44 | #define LTC2945_MIN_VIN_H 0x22 |
| 45 | #define LTC2945_MAX_VIN_THRES_H 0x24 |
| 46 | #define LTC2945_MIN_VIN_THRES_H 0x26 |
| 47 | #define LTC2945_ADIN_H 0x28 |
| 48 | #define LTC2945_MAX_ADIN_H 0x2a |
| 49 | #define LTC2945_MIN_ADIN_H 0x2c |
| 50 | #define LTC2945_MAX_ADIN_THRES_H 0x2e |
| 51 | #define LTC2945_MIN_ADIN_THRES_H 0x30 |
| 52 | #define LTC2945_MIN_ADIN_THRES_L 0x31 |
| 53 | |
| 54 | /* Fault register bits */ |
| 55 | |
| 56 | #define FAULT_ADIN_UV (1 << 0) |
| 57 | #define FAULT_ADIN_OV (1 << 1) |
| 58 | #define FAULT_VIN_UV (1 << 2) |
| 59 | #define FAULT_VIN_OV (1 << 3) |
| 60 | #define FAULT_SENSE_UV (1 << 4) |
| 61 | #define FAULT_SENSE_OV (1 << 5) |
| 62 | #define FAULT_POWER_UV (1 << 6) |
| 63 | #define FAULT_POWER_OV (1 << 7) |
| 64 | |
| 65 | /* Control register bits */ |
| 66 | |
| 67 | #define CONTROL_MULT_SELECT (1 << 0) |
| 68 | #define CONTROL_TEST_MODE (1 << 4) |
| 69 | |
| 70 | static inline bool is_power_reg(u8 reg) |
| 71 | { |
| 72 | return reg < LTC2945_SENSE_H; |
| 73 | } |
| 74 | |
| 75 | /* Return the value from the given register in uW, mV, or mA */ |
| 76 | static long long ltc2945_reg_to_val(struct device *dev, u8 reg) |
| 77 | { |
| 78 | struct regmap *regmap = dev_get_drvdata(dev); |
| 79 | unsigned int control; |
| 80 | u8 buf[3]; |
| 81 | long long val; |
| 82 | int ret; |
| 83 | |
| 84 | ret = regmap_bulk_read(regmap, reg, buf, |
| 85 | is_power_reg(reg) ? 3 : 2); |
| 86 | if (ret < 0) |
| 87 | return ret; |
| 88 | |
| 89 | if (is_power_reg(reg)) { |
| 90 | /* power */ |
| 91 | val = (buf[0] << 16) + (buf[1] << 8) + buf[2]; |
| 92 | } else { |
| 93 | /* current, voltage */ |
| 94 | val = (buf[0] << 4) + (buf[1] >> 4); |
| 95 | } |
| 96 | |
| 97 | switch (reg) { |
| 98 | case LTC2945_POWER_H: |
| 99 | case LTC2945_MAX_POWER_H: |
| 100 | case LTC2945_MIN_POWER_H: |
| 101 | case LTC2945_MAX_POWER_THRES_H: |
| 102 | case LTC2945_MIN_POWER_THRES_H: |
| 103 | /* |
| 104 | * Convert to uW by assuming current is measured with |
| 105 | * an 1mOhm sense resistor, similar to current |
| 106 | * measurements. |
| 107 | * Control register bit 0 selects if voltage at SENSE+/VDD |
| 108 | * or voltage at ADIN is used to measure power. |
| 109 | */ |
| 110 | ret = regmap_read(regmap, LTC2945_CONTROL, &control); |
| 111 | if (ret < 0) |
| 112 | return ret; |
| 113 | if (control & CONTROL_MULT_SELECT) { |
| 114 | /* 25 mV * 25 uV = 0.625 uV resolution. */ |
| 115 | val *= 625LL; |
| 116 | } else { |
| 117 | /* 0.5 mV * 25 uV = 0.0125 uV resolution. */ |
| 118 | val = (val * 25LL) >> 1; |
| 119 | } |
| 120 | break; |
| 121 | case LTC2945_VIN_H: |
| 122 | case LTC2945_MAX_VIN_H: |
| 123 | case LTC2945_MIN_VIN_H: |
| 124 | case LTC2945_MAX_VIN_THRES_H: |
| 125 | case LTC2945_MIN_VIN_THRES_H: |
| 126 | /* 25 mV resolution. Convert to mV. */ |
| 127 | val *= 25; |
| 128 | break; |
| 129 | case LTC2945_ADIN_H: |
| 130 | case LTC2945_MAX_ADIN_H: |
| 131 | case LTC2945_MIN_ADIN_THRES_H: |
| 132 | case LTC2945_MAX_ADIN_THRES_H: |
| 133 | case LTC2945_MIN_ADIN_H: |
| 134 | /* 0.5mV resolution. Convert to mV. */ |
| 135 | val = val >> 1; |
| 136 | break; |
| 137 | case LTC2945_SENSE_H: |
| 138 | case LTC2945_MAX_SENSE_H: |
| 139 | case LTC2945_MIN_SENSE_H: |
| 140 | case LTC2945_MAX_SENSE_THRES_H: |
| 141 | case LTC2945_MIN_SENSE_THRES_H: |
| 142 | /* |
| 143 | * 25 uV resolution. Convert to current as measured with |
| 144 | * an 1 mOhm sense resistor, in mA. If a different sense |
| 145 | * resistor is installed, calculate the actual current by |
| 146 | * dividing the reported current by the sense resistor value |
| 147 | * in mOhm. |
| 148 | */ |
| 149 | val *= 25; |
| 150 | break; |
| 151 | default: |
| 152 | return -EINVAL; |
| 153 | } |
| 154 | return val; |
| 155 | } |
| 156 | |
| 157 | static int ltc2945_val_to_reg(struct device *dev, u8 reg, |
| 158 | unsigned long val) |
| 159 | { |
| 160 | struct regmap *regmap = dev_get_drvdata(dev); |
| 161 | unsigned int control; |
| 162 | int ret; |
| 163 | |
| 164 | switch (reg) { |
| 165 | case LTC2945_POWER_H: |
| 166 | case LTC2945_MAX_POWER_H: |
| 167 | case LTC2945_MIN_POWER_H: |
| 168 | case LTC2945_MAX_POWER_THRES_H: |
| 169 | case LTC2945_MIN_POWER_THRES_H: |
| 170 | /* |
| 171 | * Convert to register value by assuming current is measured |
| 172 | * with an 1mOhm sense resistor, similar to current |
| 173 | * measurements. |
| 174 | * Control register bit 0 selects if voltage at SENSE+/VDD |
| 175 | * or voltage at ADIN is used to measure power, which in turn |
| 176 | * determines register calculations. |
| 177 | */ |
| 178 | ret = regmap_read(regmap, LTC2945_CONTROL, &control); |
| 179 | if (ret < 0) |
| 180 | return ret; |
| 181 | if (control & CONTROL_MULT_SELECT) { |
| 182 | /* 25 mV * 25 uV = 0.625 uV resolution. */ |
| 183 | val = DIV_ROUND_CLOSEST(val, 625); |
| 184 | } else { |
| 185 | /* |
| 186 | * 0.5 mV * 25 uV = 0.0125 uV resolution. |
| 187 | * Divide first to avoid overflow; |
| 188 | * accept loss of accuracy. |
| 189 | */ |
| 190 | val = DIV_ROUND_CLOSEST(val, 25) * 2; |
| 191 | } |
| 192 | break; |
| 193 | case LTC2945_VIN_H: |
| 194 | case LTC2945_MAX_VIN_H: |
| 195 | case LTC2945_MIN_VIN_H: |
| 196 | case LTC2945_MAX_VIN_THRES_H: |
| 197 | case LTC2945_MIN_VIN_THRES_H: |
| 198 | /* 25 mV resolution. */ |
| 199 | val /= 25; |
| 200 | break; |
| 201 | case LTC2945_ADIN_H: |
| 202 | case LTC2945_MAX_ADIN_H: |
| 203 | case LTC2945_MIN_ADIN_THRES_H: |
| 204 | case LTC2945_MAX_ADIN_THRES_H: |
| 205 | case LTC2945_MIN_ADIN_H: |
| 206 | /* 0.5mV resolution. */ |
| 207 | val *= 2; |
| 208 | break; |
| 209 | case LTC2945_SENSE_H: |
| 210 | case LTC2945_MAX_SENSE_H: |
| 211 | case LTC2945_MIN_SENSE_H: |
| 212 | case LTC2945_MAX_SENSE_THRES_H: |
| 213 | case LTC2945_MIN_SENSE_THRES_H: |
| 214 | /* |
| 215 | * 25 uV resolution. Convert to current as measured with |
| 216 | * an 1 mOhm sense resistor, in mA. If a different sense |
| 217 | * resistor is installed, calculate the actual current by |
| 218 | * dividing the reported current by the sense resistor value |
| 219 | * in mOhm. |
| 220 | */ |
| 221 | val = DIV_ROUND_CLOSEST(val, 25); |
| 222 | break; |
| 223 | default: |
| 224 | return -EINVAL; |
| 225 | } |
| 226 | return val; |
| 227 | } |
| 228 | |
| 229 | static ssize_t ltc2945_show_value(struct device *dev, |
| 230 | struct device_attribute *da, char *buf) |
| 231 | { |
| 232 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
| 233 | long long value; |
| 234 | |
| 235 | value = ltc2945_reg_to_val(dev, attr->index); |
| 236 | if (value < 0) |
| 237 | return value; |
| 238 | return snprintf(buf, PAGE_SIZE, "%lld\n", value); |
| 239 | } |
| 240 | |
| 241 | static ssize_t ltc2945_set_value(struct device *dev, |
| 242 | struct device_attribute *da, |
| 243 | const char *buf, size_t count) |
| 244 | { |
| 245 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
| 246 | struct regmap *regmap = dev_get_drvdata(dev); |
| 247 | u8 reg = attr->index; |
| 248 | unsigned long val; |
| 249 | u8 regbuf[3]; |
| 250 | int num_regs; |
| 251 | int regval; |
| 252 | int ret; |
| 253 | |
| 254 | ret = kstrtoul(buf, 10, &val); |
| 255 | if (ret) |
| 256 | return ret; |
| 257 | |
| 258 | /* convert to register value, then clamp and write result */ |
| 259 | regval = ltc2945_val_to_reg(dev, reg, val); |
| 260 | if (is_power_reg(reg)) { |
| 261 | regval = clamp_val(regval, 0, 0xffffff); |
| 262 | regbuf[0] = regval >> 16; |
| 263 | regbuf[1] = (regval >> 8) & 0xff; |
| 264 | regbuf[2] = regval; |
| 265 | num_regs = 3; |
| 266 | } else { |
| 267 | regval = clamp_val(regval, 0, 0xfff) << 4; |
| 268 | regbuf[0] = regval >> 8; |
| 269 | regbuf[1] = regval & 0xff; |
| 270 | num_regs = 2; |
| 271 | } |
| 272 | ret = regmap_bulk_write(regmap, reg, regbuf, num_regs); |
| 273 | return ret < 0 ? ret : count; |
| 274 | } |
| 275 | |
| 276 | static ssize_t ltc2945_reset_history(struct device *dev, |
| 277 | struct device_attribute *da, |
| 278 | const char *buf, size_t count) |
| 279 | { |
| 280 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
| 281 | struct regmap *regmap = dev_get_drvdata(dev); |
| 282 | u8 reg = attr->index; |
| 283 | int num_regs = is_power_reg(reg) ? 3 : 2; |
| 284 | u8 buf_min[3] = { 0xff, 0xff, 0xff }; |
| 285 | u8 buf_max[3] = { 0, 0, 0 }; |
| 286 | unsigned long val; |
| 287 | int ret; |
| 288 | |
| 289 | ret = kstrtoul(buf, 10, &val); |
| 290 | if (ret) |
| 291 | return ret; |
| 292 | if (val != 1) |
| 293 | return -EINVAL; |
| 294 | |
| 295 | ret = regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE, |
| 296 | CONTROL_TEST_MODE); |
| 297 | |
| 298 | /* Reset minimum */ |
| 299 | ret = regmap_bulk_write(regmap, reg, buf_min, num_regs); |
| 300 | if (ret) |
| 301 | return ret; |
| 302 | |
| 303 | switch (reg) { |
| 304 | case LTC2945_MIN_POWER_H: |
| 305 | reg = LTC2945_MAX_POWER_H; |
| 306 | break; |
| 307 | case LTC2945_MIN_SENSE_H: |
| 308 | reg = LTC2945_MAX_SENSE_H; |
| 309 | break; |
| 310 | case LTC2945_MIN_VIN_H: |
| 311 | reg = LTC2945_MAX_VIN_H; |
| 312 | break; |
| 313 | case LTC2945_MIN_ADIN_H: |
| 314 | reg = LTC2945_MAX_ADIN_H; |
| 315 | break; |
| 316 | default: |
| 317 | WARN_ONCE(1, "Bad register: 0x%x\n", reg); |
| 318 | return -EINVAL; |
| 319 | } |
| 320 | /* Reset maximum */ |
| 321 | ret = regmap_bulk_write(regmap, reg, buf_max, num_regs); |
| 322 | |
| 323 | /* Try resetting test mode even if there was an error */ |
| 324 | regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE, 0); |
| 325 | |
| 326 | return ret ? : count; |
| 327 | } |
| 328 | |
| 329 | static ssize_t ltc2945_show_bool(struct device *dev, |
| 330 | struct device_attribute *da, char *buf) |
| 331 | { |
| 332 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
| 333 | struct regmap *regmap = dev_get_drvdata(dev); |
| 334 | unsigned int fault; |
| 335 | int ret; |
| 336 | |
| 337 | ret = regmap_read(regmap, LTC2945_FAULT, &fault); |
| 338 | if (ret < 0) |
| 339 | return ret; |
| 340 | |
| 341 | fault &= attr->index; |
| 342 | if (fault) /* Clear reported faults in chip register */ |
| 343 | regmap_update_bits(regmap, LTC2945_FAULT, attr->index, 0); |
| 344 | |
| 345 | return snprintf(buf, PAGE_SIZE, "%d\n", !!fault); |
| 346 | } |
| 347 | |
| 348 | /* Input voltages */ |
| 349 | |
| 350 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ltc2945_show_value, NULL, |
| 351 | LTC2945_VIN_H); |
| 352 | static SENSOR_DEVICE_ATTR(in1_min, S_IRUGO | S_IWUSR, ltc2945_show_value, |
| 353 | ltc2945_set_value, LTC2945_MIN_VIN_THRES_H); |
| 354 | static SENSOR_DEVICE_ATTR(in1_max, S_IRUGO | S_IWUSR, ltc2945_show_value, |
| 355 | ltc2945_set_value, LTC2945_MAX_VIN_THRES_H); |
| 356 | static SENSOR_DEVICE_ATTR(in1_lowest, S_IRUGO, ltc2945_show_value, NULL, |
| 357 | LTC2945_MIN_VIN_H); |
| 358 | static SENSOR_DEVICE_ATTR(in1_highest, S_IRUGO, ltc2945_show_value, NULL, |
| 359 | LTC2945_MAX_VIN_H); |
| 360 | static SENSOR_DEVICE_ATTR(in1_reset_history, S_IWUSR, NULL, |
| 361 | ltc2945_reset_history, LTC2945_MIN_VIN_H); |
| 362 | |
| 363 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, ltc2945_show_value, NULL, |
| 364 | LTC2945_ADIN_H); |
| 365 | static SENSOR_DEVICE_ATTR(in2_min, S_IRUGO | S_IWUSR, ltc2945_show_value, |
| 366 | ltc2945_set_value, LTC2945_MIN_ADIN_THRES_H); |
| 367 | static SENSOR_DEVICE_ATTR(in2_max, S_IRUGO | S_IWUSR, ltc2945_show_value, |
| 368 | ltc2945_set_value, LTC2945_MAX_ADIN_THRES_H); |
| 369 | static SENSOR_DEVICE_ATTR(in2_lowest, S_IRUGO, ltc2945_show_value, NULL, |
| 370 | LTC2945_MIN_ADIN_H); |
| 371 | static SENSOR_DEVICE_ATTR(in2_highest, S_IRUGO, ltc2945_show_value, NULL, |
| 372 | LTC2945_MAX_ADIN_H); |
| 373 | static SENSOR_DEVICE_ATTR(in2_reset_history, S_IWUSR, NULL, |
| 374 | ltc2945_reset_history, LTC2945_MIN_ADIN_H); |
| 375 | |
| 376 | /* Voltage alarms */ |
| 377 | |
| 378 | static SENSOR_DEVICE_ATTR(in1_min_alarm, S_IRUGO, ltc2945_show_bool, NULL, |
| 379 | FAULT_VIN_UV); |
| 380 | static SENSOR_DEVICE_ATTR(in1_max_alarm, S_IRUGO, ltc2945_show_bool, NULL, |
| 381 | FAULT_VIN_OV); |
| 382 | static SENSOR_DEVICE_ATTR(in2_min_alarm, S_IRUGO, ltc2945_show_bool, NULL, |
| 383 | FAULT_ADIN_UV); |
| 384 | static SENSOR_DEVICE_ATTR(in2_max_alarm, S_IRUGO, ltc2945_show_bool, NULL, |
| 385 | FAULT_ADIN_OV); |
| 386 | |
| 387 | /* Currents (via sense resistor) */ |
| 388 | |
| 389 | static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ltc2945_show_value, NULL, |
| 390 | LTC2945_SENSE_H); |
| 391 | static SENSOR_DEVICE_ATTR(curr1_min, S_IRUGO | S_IWUSR, ltc2945_show_value, |
| 392 | ltc2945_set_value, LTC2945_MIN_SENSE_THRES_H); |
| 393 | static SENSOR_DEVICE_ATTR(curr1_max, S_IRUGO | S_IWUSR, ltc2945_show_value, |
| 394 | ltc2945_set_value, LTC2945_MAX_SENSE_THRES_H); |
| 395 | static SENSOR_DEVICE_ATTR(curr1_lowest, S_IRUGO, ltc2945_show_value, NULL, |
| 396 | LTC2945_MIN_SENSE_H); |
| 397 | static SENSOR_DEVICE_ATTR(curr1_highest, S_IRUGO, ltc2945_show_value, NULL, |
| 398 | LTC2945_MAX_SENSE_H); |
| 399 | static SENSOR_DEVICE_ATTR(curr1_reset_history, S_IWUSR, NULL, |
| 400 | ltc2945_reset_history, LTC2945_MIN_SENSE_H); |
| 401 | |
| 402 | /* Current alarms */ |
| 403 | |
| 404 | static SENSOR_DEVICE_ATTR(curr1_min_alarm, S_IRUGO, ltc2945_show_bool, NULL, |
| 405 | FAULT_SENSE_UV); |
| 406 | static SENSOR_DEVICE_ATTR(curr1_max_alarm, S_IRUGO, ltc2945_show_bool, NULL, |
| 407 | FAULT_SENSE_OV); |
| 408 | |
| 409 | /* Power */ |
| 410 | |
| 411 | static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ltc2945_show_value, NULL, |
| 412 | LTC2945_POWER_H); |
| 413 | static SENSOR_DEVICE_ATTR(power1_min, S_IRUGO | S_IWUSR, ltc2945_show_value, |
| 414 | ltc2945_set_value, LTC2945_MIN_POWER_THRES_H); |
| 415 | static SENSOR_DEVICE_ATTR(power1_max, S_IRUGO | S_IWUSR, ltc2945_show_value, |
| 416 | ltc2945_set_value, LTC2945_MAX_POWER_THRES_H); |
| 417 | static SENSOR_DEVICE_ATTR(power1_input_lowest, S_IRUGO, ltc2945_show_value, |
| 418 | NULL, LTC2945_MIN_POWER_H); |
| 419 | static SENSOR_DEVICE_ATTR(power1_input_highest, S_IRUGO, ltc2945_show_value, |
| 420 | NULL, LTC2945_MAX_POWER_H); |
| 421 | static SENSOR_DEVICE_ATTR(power1_reset_history, S_IWUSR, NULL, |
| 422 | ltc2945_reset_history, LTC2945_MIN_POWER_H); |
| 423 | |
| 424 | /* Power alarms */ |
| 425 | |
| 426 | static SENSOR_DEVICE_ATTR(power1_min_alarm, S_IRUGO, ltc2945_show_bool, NULL, |
| 427 | FAULT_POWER_UV); |
| 428 | static SENSOR_DEVICE_ATTR(power1_max_alarm, S_IRUGO, ltc2945_show_bool, NULL, |
| 429 | FAULT_POWER_OV); |
| 430 | |
| 431 | static struct attribute *ltc2945_attrs[] = { |
| 432 | &sensor_dev_attr_in1_input.dev_attr.attr, |
| 433 | &sensor_dev_attr_in1_min.dev_attr.attr, |
| 434 | &sensor_dev_attr_in1_max.dev_attr.attr, |
| 435 | &sensor_dev_attr_in1_lowest.dev_attr.attr, |
| 436 | &sensor_dev_attr_in1_highest.dev_attr.attr, |
| 437 | &sensor_dev_attr_in1_reset_history.dev_attr.attr, |
| 438 | &sensor_dev_attr_in1_min_alarm.dev_attr.attr, |
| 439 | &sensor_dev_attr_in1_max_alarm.dev_attr.attr, |
| 440 | |
| 441 | &sensor_dev_attr_in2_input.dev_attr.attr, |
| 442 | &sensor_dev_attr_in2_min.dev_attr.attr, |
| 443 | &sensor_dev_attr_in2_max.dev_attr.attr, |
| 444 | &sensor_dev_attr_in2_lowest.dev_attr.attr, |
| 445 | &sensor_dev_attr_in2_highest.dev_attr.attr, |
| 446 | &sensor_dev_attr_in2_reset_history.dev_attr.attr, |
| 447 | &sensor_dev_attr_in2_min_alarm.dev_attr.attr, |
| 448 | &sensor_dev_attr_in2_max_alarm.dev_attr.attr, |
| 449 | |
| 450 | &sensor_dev_attr_curr1_input.dev_attr.attr, |
| 451 | &sensor_dev_attr_curr1_min.dev_attr.attr, |
| 452 | &sensor_dev_attr_curr1_max.dev_attr.attr, |
| 453 | &sensor_dev_attr_curr1_lowest.dev_attr.attr, |
| 454 | &sensor_dev_attr_curr1_highest.dev_attr.attr, |
| 455 | &sensor_dev_attr_curr1_reset_history.dev_attr.attr, |
| 456 | &sensor_dev_attr_curr1_min_alarm.dev_attr.attr, |
| 457 | &sensor_dev_attr_curr1_max_alarm.dev_attr.attr, |
| 458 | |
| 459 | &sensor_dev_attr_power1_input.dev_attr.attr, |
| 460 | &sensor_dev_attr_power1_min.dev_attr.attr, |
| 461 | &sensor_dev_attr_power1_max.dev_attr.attr, |
| 462 | &sensor_dev_attr_power1_input_lowest.dev_attr.attr, |
| 463 | &sensor_dev_attr_power1_input_highest.dev_attr.attr, |
| 464 | &sensor_dev_attr_power1_reset_history.dev_attr.attr, |
| 465 | &sensor_dev_attr_power1_min_alarm.dev_attr.attr, |
| 466 | &sensor_dev_attr_power1_max_alarm.dev_attr.attr, |
| 467 | |
| 468 | NULL, |
| 469 | }; |
| 470 | ATTRIBUTE_GROUPS(ltc2945); |
| 471 | |
| 472 | static const struct regmap_config ltc2945_regmap_config = { |
| 473 | .reg_bits = 8, |
| 474 | .val_bits = 8, |
| 475 | .max_register = LTC2945_MIN_ADIN_THRES_L, |
| 476 | }; |
| 477 | |
| 478 | static int ltc2945_probe(struct i2c_client *client, |
| 479 | const struct i2c_device_id *id) |
| 480 | { |
| 481 | struct device *dev = &client->dev; |
| 482 | struct device *hwmon_dev; |
| 483 | struct regmap *regmap; |
| 484 | |
| 485 | regmap = devm_regmap_init_i2c(client, <c2945_regmap_config); |
| 486 | if (IS_ERR(regmap)) { |
| 487 | dev_err(dev, "failed to allocate register map\n"); |
| 488 | return PTR_ERR(regmap); |
| 489 | } |
| 490 | |
| 491 | /* Clear faults */ |
| 492 | regmap_write(regmap, LTC2945_FAULT, 0x00); |
| 493 | |
| 494 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
| 495 | regmap, |
| 496 | ltc2945_groups); |
| 497 | return PTR_ERR_OR_ZERO(hwmon_dev); |
| 498 | } |
| 499 | |
| 500 | static const struct i2c_device_id ltc2945_id[] = { |
| 501 | {"ltc2945", 0}, |
| 502 | { } |
| 503 | }; |
| 504 | |
| 505 | MODULE_DEVICE_TABLE(i2c, ltc2945_id); |
| 506 | |
| 507 | static struct i2c_driver ltc2945_driver = { |
| 508 | .driver = { |
| 509 | .name = "ltc2945", |
| 510 | }, |
| 511 | .probe = ltc2945_probe, |
| 512 | .id_table = ltc2945_id, |
| 513 | }; |
| 514 | |
| 515 | module_i2c_driver(ltc2945_driver); |
| 516 | |
| 517 | MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); |
| 518 | MODULE_DESCRIPTION("LTC2945 driver"); |
| 519 | MODULE_LICENSE("GPL"); |