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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * nct7802 - Driver for Nuvoton NCT7802Y4 *5 * Copyright (C) 2014 Guenter Roeck <linux@roeck-us.net>6 */7 8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt9 10#include <linux/err.h>11#include <linux/i2c.h>12#include <linux/init.h>13#include <linux/hwmon.h>14#include <linux/hwmon-sysfs.h>15#include <linux/jiffies.h>16#include <linux/module.h>17#include <linux/mutex.h>18#include <linux/regmap.h>19#include <linux/slab.h>20 21#define DRVNAME "nct7802"22 23static const u8 REG_VOLTAGE[5] = { 0x09, 0x0a, 0x0c, 0x0d, 0x0e };24 25static const u8 REG_VOLTAGE_LIMIT_LSB[2][5] = {26 { 0x46, 0x00, 0x40, 0x42, 0x44 },27 { 0x45, 0x00, 0x3f, 0x41, 0x43 },28};29 30static const u8 REG_VOLTAGE_LIMIT_MSB[5] = { 0x48, 0x00, 0x47, 0x47, 0x48 };31 32static const u8 REG_VOLTAGE_LIMIT_MSB_SHIFT[2][5] = {33 { 0, 0, 4, 0, 4 },34 { 2, 0, 6, 2, 6 },35};36 37#define REG_BANK 0x0038#define REG_TEMP_LSB 0x0539#define REG_TEMP_PECI_LSB 0x0840#define REG_VOLTAGE_LOW 0x0f41#define REG_FANCOUNT_LOW 0x1342#define REG_START 0x2143#define REG_MODE 0x22 /* 7.2.32 Mode Selection Register */44#define REG_PECI_ENABLE 0x2345#define REG_FAN_ENABLE 0x2446#define REG_VMON_ENABLE 0x2547#define REG_PWM(x) (0x60 + (x))48#define REG_SMARTFAN_EN(x) (0x64 + (x) / 2)49#define SMARTFAN_EN_SHIFT(x) ((x) % 2 * 4)50#define REG_VENDOR_ID 0xfd51#define REG_CHIP_ID 0xfe52#define REG_VERSION_ID 0xff53 54/*55 * Resistance temperature detector (RTD) modes according to 7.2.32 Mode56 * Selection Register57 */58#define RTD_MODE_CURRENT 0x159#define RTD_MODE_THERMISTOR 0x260#define RTD_MODE_VOLTAGE 0x361 62#define MODE_RTD_MASK 0x363#define MODE_LTD_EN 0x4064 65/*66 * Bit offset for sensors modes in REG_MODE.67 * Valid for index 0..2, indicating RTD1..3.68 */69#define MODE_BIT_OFFSET_RTD(index) ((index) * 2)70 71/*72 * Data structures and manipulation thereof73 */74 75struct nct7802_data {76 struct regmap *regmap;77 struct mutex access_lock; /* for multi-byte read and write operations */78 u8 in_status;79 struct mutex in_alarm_lock;80};81 82static ssize_t temp_type_show(struct device *dev,83 struct device_attribute *attr, char *buf)84{85 struct nct7802_data *data = dev_get_drvdata(dev);86 struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);87 unsigned int mode;88 int ret;89 90 ret = regmap_read(data->regmap, REG_MODE, &mode);91 if (ret < 0)92 return ret;93 94 return sprintf(buf, "%u\n", (mode >> (2 * sattr->index) & 3) + 2);95}96 97static ssize_t temp_type_store(struct device *dev,98 struct device_attribute *attr, const char *buf,99 size_t count)100{101 struct nct7802_data *data = dev_get_drvdata(dev);102 struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);103 unsigned int type;104 int err;105 106 err = kstrtouint(buf, 0, &type);107 if (err < 0)108 return err;109 if (sattr->index == 2 && type != 4) /* RD3 */110 return -EINVAL;111 if (type < 3 || type > 4)112 return -EINVAL;113 err = regmap_update_bits(data->regmap, REG_MODE,114 3 << 2 * sattr->index, (type - 2) << 2 * sattr->index);115 return err ? : count;116}117 118static ssize_t pwm_mode_show(struct device *dev,119 struct device_attribute *attr, char *buf)120{121 struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);122 struct nct7802_data *data = dev_get_drvdata(dev);123 unsigned int regval;124 int ret;125 126 if (sattr->index > 1)127 return sprintf(buf, "1\n");128 129 ret = regmap_read(data->regmap, 0x5E, ®val);130 if (ret < 0)131 return ret;132 133 return sprintf(buf, "%u\n", !(regval & (1 << sattr->index)));134}135 136static ssize_t pwm_show(struct device *dev, struct device_attribute *devattr,137 char *buf)138{139 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);140 struct nct7802_data *data = dev_get_drvdata(dev);141 unsigned int val;142 int ret;143 144 if (!attr->index)145 return sprintf(buf, "255\n");146 147 ret = regmap_read(data->regmap, attr->index, &val);148 if (ret < 0)149 return ret;150 151 return sprintf(buf, "%d\n", val);152}153 154static ssize_t pwm_store(struct device *dev, struct device_attribute *devattr,155 const char *buf, size_t count)156{157 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);158 struct nct7802_data *data = dev_get_drvdata(dev);159 int err;160 u8 val;161 162 err = kstrtou8(buf, 0, &val);163 if (err < 0)164 return err;165 166 err = regmap_write(data->regmap, attr->index, val);167 return err ? : count;168}169 170static ssize_t pwm_enable_show(struct device *dev,171 struct device_attribute *attr, char *buf)172{173 struct nct7802_data *data = dev_get_drvdata(dev);174 struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);175 unsigned int reg, enabled;176 int ret;177 178 ret = regmap_read(data->regmap, REG_SMARTFAN_EN(sattr->index), ®);179 if (ret < 0)180 return ret;181 enabled = reg >> SMARTFAN_EN_SHIFT(sattr->index) & 1;182 return sprintf(buf, "%u\n", enabled + 1);183}184 185static ssize_t pwm_enable_store(struct device *dev,186 struct device_attribute *attr,187 const char *buf, size_t count)188{189 struct nct7802_data *data = dev_get_drvdata(dev);190 struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);191 u8 val;192 int ret;193 194 ret = kstrtou8(buf, 0, &val);195 if (ret < 0)196 return ret;197 if (val < 1 || val > 2)198 return -EINVAL;199 ret = regmap_update_bits(data->regmap, REG_SMARTFAN_EN(sattr->index),200 1 << SMARTFAN_EN_SHIFT(sattr->index),201 (val - 1) << SMARTFAN_EN_SHIFT(sattr->index));202 return ret ? : count;203}204 205static int nct7802_read_temp(struct nct7802_data *data,206 u8 reg_temp, u8 reg_temp_low, int *temp)207{208 unsigned int t1, t2 = 0;209 int err;210 211 *temp = 0;212 213 mutex_lock(&data->access_lock);214 err = regmap_read(data->regmap, reg_temp, &t1);215 if (err < 0)216 goto abort;217 t1 <<= 8;218 if (reg_temp_low) { /* 11 bit data */219 err = regmap_read(data->regmap, reg_temp_low, &t2);220 if (err < 0)221 goto abort;222 }223 t1 |= t2 & 0xe0;224 *temp = (s16)t1 / 32 * 125;225abort:226 mutex_unlock(&data->access_lock);227 return err;228}229 230static int nct7802_read_fan(struct nct7802_data *data, u8 reg_fan)231{232 unsigned int regs[2] = {reg_fan, REG_FANCOUNT_LOW};233 u8 f[2];234 int ret;235 236 ret = regmap_multi_reg_read(data->regmap, regs, f, 2);237 if (ret)238 return ret;239 ret = (f[0] << 5) | (f[1] >> 3);240 /* convert fan count to rpm */241 if (ret == 0x1fff) /* maximum value, assume fan is stopped */242 ret = 0;243 else if (ret)244 ret = DIV_ROUND_CLOSEST(1350000U, ret);245 return ret;246}247 248static int nct7802_read_fan_min(struct nct7802_data *data, u8 reg_fan_low,249 u8 reg_fan_high)250{251 unsigned int regs[2] = {reg_fan_low, reg_fan_high};252 u8 f[2];253 int ret;254 255 ret = regmap_multi_reg_read(data->regmap, regs, f, 2);256 if (ret < 0)257 return ret;258 259 ret = f[0] | ((f[1] & 0xf8) << 5);260 /* convert fan count to rpm */261 if (ret == 0x1fff) /* maximum value, assume no limit */262 ret = 0;263 else if (ret)264 ret = DIV_ROUND_CLOSEST(1350000U, ret);265 else266 ret = 1350000U;267 return ret;268}269 270static int nct7802_write_fan_min(struct nct7802_data *data, u8 reg_fan_low,271 u8 reg_fan_high, unsigned long limit)272{273 int err;274 275 if (limit)276 limit = DIV_ROUND_CLOSEST(1350000U, limit);277 else278 limit = 0x1fff;279 limit = clamp_val(limit, 0, 0x1fff);280 281 mutex_lock(&data->access_lock);282 err = regmap_write(data->regmap, reg_fan_low, limit & 0xff);283 if (err < 0)284 goto abort;285 286 err = regmap_write(data->regmap, reg_fan_high, (limit & 0x1f00) >> 5);287abort:288 mutex_unlock(&data->access_lock);289 return err;290}291 292static u8 nct7802_vmul[] = { 4, 2, 2, 2, 2 };293 294static int nct7802_read_voltage(struct nct7802_data *data, int nr, int index)295{296 u8 v[2];297 int ret;298 299 if (index == 0) { /* voltage */300 unsigned int regs[2] = {REG_VOLTAGE[nr], REG_VOLTAGE_LOW};301 302 ret = regmap_multi_reg_read(data->regmap, regs, v, 2);303 if (ret < 0)304 return ret;305 ret = ((v[0] << 2) | (v[1] >> 6)) * nct7802_vmul[nr];306 } else { /* limit */307 int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr];308 unsigned int regs[2] = {REG_VOLTAGE_LIMIT_LSB[index - 1][nr],309 REG_VOLTAGE_LIMIT_MSB[nr]};310 311 ret = regmap_multi_reg_read(data->regmap, regs, v, 2);312 if (ret < 0)313 return ret;314 ret = (v[0] | ((v[1] << shift) & 0x300)) * nct7802_vmul[nr];315 }316 return ret;317}318 319static int nct7802_write_voltage(struct nct7802_data *data, int nr, int index,320 unsigned long voltage)321{322 int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr];323 int err;324 325 voltage = clamp_val(voltage, 0, 0x3ff * nct7802_vmul[nr]);326 voltage = DIV_ROUND_CLOSEST(voltage, nct7802_vmul[nr]);327 328 mutex_lock(&data->access_lock);329 err = regmap_write(data->regmap,330 REG_VOLTAGE_LIMIT_LSB[index - 1][nr],331 voltage & 0xff);332 if (err < 0)333 goto abort;334 335 err = regmap_update_bits(data->regmap, REG_VOLTAGE_LIMIT_MSB[nr],336 0x0300 >> shift, (voltage & 0x0300) >> shift);337abort:338 mutex_unlock(&data->access_lock);339 return err;340}341 342static ssize_t in_show(struct device *dev, struct device_attribute *attr,343 char *buf)344{345 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);346 struct nct7802_data *data = dev_get_drvdata(dev);347 int voltage;348 349 voltage = nct7802_read_voltage(data, sattr->nr, sattr->index);350 if (voltage < 0)351 return voltage;352 353 return sprintf(buf, "%d\n", voltage);354}355 356static ssize_t in_store(struct device *dev, struct device_attribute *attr,357 const char *buf, size_t count)358{359 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);360 struct nct7802_data *data = dev_get_drvdata(dev);361 int index = sattr->index;362 int nr = sattr->nr;363 unsigned long val;364 int err;365 366 err = kstrtoul(buf, 10, &val);367 if (err < 0)368 return err;369 370 err = nct7802_write_voltage(data, nr, index, val);371 return err ? : count;372}373 374static ssize_t in_alarm_show(struct device *dev, struct device_attribute *attr,375 char *buf)376{377 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);378 struct nct7802_data *data = dev_get_drvdata(dev);379 int volt, min, max, ret;380 unsigned int val;381 382 mutex_lock(&data->in_alarm_lock);383 384 /*385 * The SMI Voltage status register is the only register giving a status386 * for voltages. A bit is set for each input crossing a threshold, in387 * both direction, but the "inside" or "outside" limits info is not388 * available. Also this register is cleared on read.389 * Note: this is not explicitly spelled out in the datasheet, but390 * from experiment.391 * To deal with this we use a status cache with one validity bit and392 * one status bit for each input. Validity is cleared at startup and393 * each time the register reports a change, and the status is processed394 * by software based on current input value and limits.395 */396 ret = regmap_read(data->regmap, 0x1e, &val); /* SMI Voltage status */397 if (ret < 0)398 goto abort;399 400 /* invalidate cached status for all inputs crossing a threshold */401 data->in_status &= ~((val & 0x0f) << 4);402 403 /* if cached status for requested input is invalid, update it */404 if (!(data->in_status & (0x10 << sattr->index))) {405 ret = nct7802_read_voltage(data, sattr->nr, 0);406 if (ret < 0)407 goto abort;408 volt = ret;409 410 ret = nct7802_read_voltage(data, sattr->nr, 1);411 if (ret < 0)412 goto abort;413 min = ret;414 415 ret = nct7802_read_voltage(data, sattr->nr, 2);416 if (ret < 0)417 goto abort;418 max = ret;419 420 if (volt < min || volt > max)421 data->in_status |= (1 << sattr->index);422 else423 data->in_status &= ~(1 << sattr->index);424 425 data->in_status |= 0x10 << sattr->index;426 }427 428 ret = sprintf(buf, "%u\n", !!(data->in_status & (1 << sattr->index)));429abort:430 mutex_unlock(&data->in_alarm_lock);431 return ret;432}433 434static ssize_t temp_show(struct device *dev, struct device_attribute *attr,435 char *buf)436{437 struct nct7802_data *data = dev_get_drvdata(dev);438 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);439 int err, temp;440 441 err = nct7802_read_temp(data, sattr->nr, sattr->index, &temp);442 if (err < 0)443 return err;444 445 return sprintf(buf, "%d\n", temp);446}447 448static ssize_t temp_store(struct device *dev, struct device_attribute *attr,449 const char *buf, size_t count)450{451 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);452 struct nct7802_data *data = dev_get_drvdata(dev);453 int nr = sattr->nr;454 long val;455 int err;456 457 err = kstrtol(buf, 10, &val);458 if (err < 0)459 return err;460 461 val = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);462 463 err = regmap_write(data->regmap, nr, val & 0xff);464 return err ? : count;465}466 467static ssize_t fan_show(struct device *dev, struct device_attribute *attr,468 char *buf)469{470 struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);471 struct nct7802_data *data = dev_get_drvdata(dev);472 int speed;473 474 speed = nct7802_read_fan(data, sattr->index);475 if (speed < 0)476 return speed;477 478 return sprintf(buf, "%d\n", speed);479}480 481static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr,482 char *buf)483{484 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);485 struct nct7802_data *data = dev_get_drvdata(dev);486 int speed;487 488 speed = nct7802_read_fan_min(data, sattr->nr, sattr->index);489 if (speed < 0)490 return speed;491 492 return sprintf(buf, "%d\n", speed);493}494 495static ssize_t fan_min_store(struct device *dev,496 struct device_attribute *attr, const char *buf,497 size_t count)498{499 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);500 struct nct7802_data *data = dev_get_drvdata(dev);501 unsigned long val;502 int err;503 504 err = kstrtoul(buf, 10, &val);505 if (err < 0)506 return err;507 508 err = nct7802_write_fan_min(data, sattr->nr, sattr->index, val);509 return err ? : count;510}511 512static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,513 char *buf)514{515 struct nct7802_data *data = dev_get_drvdata(dev);516 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);517 int bit = sattr->index;518 unsigned int val;519 int ret;520 521 ret = regmap_read(data->regmap, sattr->nr, &val);522 if (ret < 0)523 return ret;524 525 return sprintf(buf, "%u\n", !!(val & (1 << bit)));526}527 528static ssize_t529beep_show(struct device *dev, struct device_attribute *attr, char *buf)530{531 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);532 struct nct7802_data *data = dev_get_drvdata(dev);533 unsigned int regval;534 int err;535 536 err = regmap_read(data->regmap, sattr->nr, ®val);537 if (err)538 return err;539 540 return sprintf(buf, "%u\n", !!(regval & (1 << sattr->index)));541}542 543static ssize_t544beep_store(struct device *dev, struct device_attribute *attr, const char *buf,545 size_t count)546{547 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);548 struct nct7802_data *data = dev_get_drvdata(dev);549 unsigned long val;550 int err;551 552 err = kstrtoul(buf, 10, &val);553 if (err < 0)554 return err;555 if (val > 1)556 return -EINVAL;557 558 err = regmap_update_bits(data->regmap, sattr->nr, 1 << sattr->index,559 val ? 1 << sattr->index : 0);560 return err ? : count;561}562 563static SENSOR_DEVICE_ATTR_RW(temp1_type, temp_type, 0);564static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0x01, REG_TEMP_LSB);565static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 0x31, 0);566static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0x30, 0);567static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0x3a, 0);568 569static SENSOR_DEVICE_ATTR_RW(temp2_type, temp_type, 1);570static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 0x02, REG_TEMP_LSB);571static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 0x33, 0);572static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 0x32, 0);573static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 0x3b, 0);574 575static SENSOR_DEVICE_ATTR_RW(temp3_type, temp_type, 2);576static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 0x03, REG_TEMP_LSB);577static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 0x35, 0);578static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 0x34, 0);579static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 0x3c, 0);580 581static SENSOR_DEVICE_ATTR_2_RO(temp4_input, temp, 0x04, 0);582static SENSOR_DEVICE_ATTR_2_RW(temp4_min, temp, 0x37, 0);583static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 0x36, 0);584static SENSOR_DEVICE_ATTR_2_RW(temp4_crit, temp, 0x3d, 0);585 586static SENSOR_DEVICE_ATTR_2_RO(temp5_input, temp, 0x06, REG_TEMP_PECI_LSB);587static SENSOR_DEVICE_ATTR_2_RW(temp5_min, temp, 0x39, 0);588static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 0x38, 0);589static SENSOR_DEVICE_ATTR_2_RW(temp5_crit, temp, 0x3e, 0);590 591static SENSOR_DEVICE_ATTR_2_RO(temp6_input, temp, 0x07, REG_TEMP_PECI_LSB);592 593static SENSOR_DEVICE_ATTR_2_RO(temp1_min_alarm, alarm, 0x18, 0);594static SENSOR_DEVICE_ATTR_2_RO(temp2_min_alarm, alarm, 0x18, 1);595static SENSOR_DEVICE_ATTR_2_RO(temp3_min_alarm, alarm, 0x18, 2);596static SENSOR_DEVICE_ATTR_2_RO(temp4_min_alarm, alarm, 0x18, 3);597static SENSOR_DEVICE_ATTR_2_RO(temp5_min_alarm, alarm, 0x18, 4);598 599static SENSOR_DEVICE_ATTR_2_RO(temp1_max_alarm, alarm, 0x19, 0);600static SENSOR_DEVICE_ATTR_2_RO(temp2_max_alarm, alarm, 0x19, 1);601static SENSOR_DEVICE_ATTR_2_RO(temp3_max_alarm, alarm, 0x19, 2);602static SENSOR_DEVICE_ATTR_2_RO(temp4_max_alarm, alarm, 0x19, 3);603static SENSOR_DEVICE_ATTR_2_RO(temp5_max_alarm, alarm, 0x19, 4);604 605static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, alarm, 0x1b, 0);606static SENSOR_DEVICE_ATTR_2_RO(temp2_crit_alarm, alarm, 0x1b, 1);607static SENSOR_DEVICE_ATTR_2_RO(temp3_crit_alarm, alarm, 0x1b, 2);608static SENSOR_DEVICE_ATTR_2_RO(temp4_crit_alarm, alarm, 0x1b, 3);609static SENSOR_DEVICE_ATTR_2_RO(temp5_crit_alarm, alarm, 0x1b, 4);610 611static SENSOR_DEVICE_ATTR_2_RO(temp1_fault, alarm, 0x17, 0);612static SENSOR_DEVICE_ATTR_2_RO(temp2_fault, alarm, 0x17, 1);613static SENSOR_DEVICE_ATTR_2_RO(temp3_fault, alarm, 0x17, 2);614 615static SENSOR_DEVICE_ATTR_2_RW(temp1_beep, beep, 0x5c, 0);616static SENSOR_DEVICE_ATTR_2_RW(temp2_beep, beep, 0x5c, 1);617static SENSOR_DEVICE_ATTR_2_RW(temp3_beep, beep, 0x5c, 2);618static SENSOR_DEVICE_ATTR_2_RW(temp4_beep, beep, 0x5c, 3);619static SENSOR_DEVICE_ATTR_2_RW(temp5_beep, beep, 0x5c, 4);620static SENSOR_DEVICE_ATTR_2_RW(temp6_beep, beep, 0x5c, 5);621 622static struct attribute *nct7802_temp_attrs[] = {623 &sensor_dev_attr_temp1_type.dev_attr.attr,624 &sensor_dev_attr_temp1_input.dev_attr.attr,625 &sensor_dev_attr_temp1_min.dev_attr.attr,626 &sensor_dev_attr_temp1_max.dev_attr.attr,627 &sensor_dev_attr_temp1_crit.dev_attr.attr,628 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,629 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,630 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,631 &sensor_dev_attr_temp1_fault.dev_attr.attr,632 &sensor_dev_attr_temp1_beep.dev_attr.attr,633 634 &sensor_dev_attr_temp2_type.dev_attr.attr, /* 10 */635 &sensor_dev_attr_temp2_input.dev_attr.attr,636 &sensor_dev_attr_temp2_min.dev_attr.attr,637 &sensor_dev_attr_temp2_max.dev_attr.attr,638 &sensor_dev_attr_temp2_crit.dev_attr.attr,639 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,640 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,641 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,642 &sensor_dev_attr_temp2_fault.dev_attr.attr,643 &sensor_dev_attr_temp2_beep.dev_attr.attr,644 645 &sensor_dev_attr_temp3_type.dev_attr.attr, /* 20 */646 &sensor_dev_attr_temp3_input.dev_attr.attr,647 &sensor_dev_attr_temp3_min.dev_attr.attr,648 &sensor_dev_attr_temp3_max.dev_attr.attr,649 &sensor_dev_attr_temp3_crit.dev_attr.attr,650 &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,651 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,652 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,653 &sensor_dev_attr_temp3_fault.dev_attr.attr,654 &sensor_dev_attr_temp3_beep.dev_attr.attr,655 656 &sensor_dev_attr_temp4_input.dev_attr.attr, /* 30 */657 &sensor_dev_attr_temp4_min.dev_attr.attr,658 &sensor_dev_attr_temp4_max.dev_attr.attr,659 &sensor_dev_attr_temp4_crit.dev_attr.attr,660 &sensor_dev_attr_temp4_min_alarm.dev_attr.attr,661 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,662 &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,663 &sensor_dev_attr_temp4_beep.dev_attr.attr,664 665 &sensor_dev_attr_temp5_input.dev_attr.attr, /* 38 */666 &sensor_dev_attr_temp5_min.dev_attr.attr,667 &sensor_dev_attr_temp5_max.dev_attr.attr,668 &sensor_dev_attr_temp5_crit.dev_attr.attr,669 &sensor_dev_attr_temp5_min_alarm.dev_attr.attr,670 &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,671 &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,672 &sensor_dev_attr_temp5_beep.dev_attr.attr,673 674 &sensor_dev_attr_temp6_input.dev_attr.attr, /* 46 */675 &sensor_dev_attr_temp6_beep.dev_attr.attr,676 677 NULL678};679 680static umode_t nct7802_temp_is_visible(struct kobject *kobj,681 struct attribute *attr, int index)682{683 struct device *dev = kobj_to_dev(kobj);684 struct nct7802_data *data = dev_get_drvdata(dev);685 unsigned int reg;686 int err;687 688 err = regmap_read(data->regmap, REG_MODE, ®);689 if (err < 0)690 return 0;691 692 if (index < 10 &&693 (reg & 03) != 0x01 && (reg & 0x03) != 0x02) /* RD1 */694 return 0;695 696 if (index >= 10 && index < 20 &&697 (reg & 0x0c) != 0x04 && (reg & 0x0c) != 0x08) /* RD2 */698 return 0;699 if (index >= 20 && index < 30 && (reg & 0x30) != 0x20) /* RD3 */700 return 0;701 702 if (index >= 30 && index < 38) /* local */703 return attr->mode;704 705 err = regmap_read(data->regmap, REG_PECI_ENABLE, ®);706 if (err < 0)707 return 0;708 709 if (index >= 38 && index < 46 && !(reg & 0x01)) /* PECI 0 */710 return 0;711 712 if (index >= 46 && !(reg & 0x02)) /* PECI 1 */713 return 0;714 715 return attr->mode;716}717 718static const struct attribute_group nct7802_temp_group = {719 .attrs = nct7802_temp_attrs,720 .is_visible = nct7802_temp_is_visible,721};722 723static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, 0, 0);724static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, 0, 1);725static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, 0, 2);726static SENSOR_DEVICE_ATTR_2_RO(in0_alarm, in_alarm, 0, 3);727static SENSOR_DEVICE_ATTR_2_RW(in0_beep, beep, 0x5a, 3);728 729static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, 1, 0);730 731static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, 2, 0);732static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, 2, 1);733static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, 2, 2);734static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, in_alarm, 2, 0);735static SENSOR_DEVICE_ATTR_2_RW(in2_beep, beep, 0x5a, 0);736 737static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, 3, 0);738static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, 3, 1);739static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, 3, 2);740static SENSOR_DEVICE_ATTR_2_RO(in3_alarm, in_alarm, 3, 1);741static SENSOR_DEVICE_ATTR_2_RW(in3_beep, beep, 0x5a, 1);742 743static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, 4, 0);744static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, 4, 1);745static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, 4, 2);746static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, in_alarm, 4, 2);747static SENSOR_DEVICE_ATTR_2_RW(in4_beep, beep, 0x5a, 2);748 749static struct attribute *nct7802_in_attrs[] = {750 &sensor_dev_attr_in0_input.dev_attr.attr,751 &sensor_dev_attr_in0_min.dev_attr.attr,752 &sensor_dev_attr_in0_max.dev_attr.attr,753 &sensor_dev_attr_in0_alarm.dev_attr.attr,754 &sensor_dev_attr_in0_beep.dev_attr.attr,755 756 &sensor_dev_attr_in1_input.dev_attr.attr, /* 5 */757 758 &sensor_dev_attr_in2_input.dev_attr.attr, /* 6 */759 &sensor_dev_attr_in2_min.dev_attr.attr,760 &sensor_dev_attr_in2_max.dev_attr.attr,761 &sensor_dev_attr_in2_alarm.dev_attr.attr,762 &sensor_dev_attr_in2_beep.dev_attr.attr,763 764 &sensor_dev_attr_in3_input.dev_attr.attr, /* 11 */765 &sensor_dev_attr_in3_min.dev_attr.attr,766 &sensor_dev_attr_in3_max.dev_attr.attr,767 &sensor_dev_attr_in3_alarm.dev_attr.attr,768 &sensor_dev_attr_in3_beep.dev_attr.attr,769 770 &sensor_dev_attr_in4_input.dev_attr.attr, /* 16 */771 &sensor_dev_attr_in4_min.dev_attr.attr,772 &sensor_dev_attr_in4_max.dev_attr.attr,773 &sensor_dev_attr_in4_alarm.dev_attr.attr,774 &sensor_dev_attr_in4_beep.dev_attr.attr,775 776 NULL,777};778 779static umode_t nct7802_in_is_visible(struct kobject *kobj,780 struct attribute *attr, int index)781{782 struct device *dev = kobj_to_dev(kobj);783 struct nct7802_data *data = dev_get_drvdata(dev);784 unsigned int reg;785 int err;786 787 if (index < 6) /* VCC, VCORE */788 return attr->mode;789 790 err = regmap_read(data->regmap, REG_MODE, ®);791 if (err < 0)792 return 0;793 794 if (index >= 6 && index < 11 && (reg & 0x03) != 0x03) /* VSEN1 */795 return 0;796 if (index >= 11 && index < 16 && (reg & 0x0c) != 0x0c) /* VSEN2 */797 return 0;798 if (index >= 16 && (reg & 0x30) != 0x30) /* VSEN3 */799 return 0;800 801 return attr->mode;802}803 804static const struct attribute_group nct7802_in_group = {805 .attrs = nct7802_in_attrs,806 .is_visible = nct7802_in_is_visible,807};808 809static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0x10);810static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan_min, 0x49, 0x4c);811static SENSOR_DEVICE_ATTR_2_RO(fan1_alarm, alarm, 0x1a, 0);812static SENSOR_DEVICE_ATTR_2_RW(fan1_beep, beep, 0x5b, 0);813static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 0x11);814static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan_min, 0x4a, 0x4d);815static SENSOR_DEVICE_ATTR_2_RO(fan2_alarm, alarm, 0x1a, 1);816static SENSOR_DEVICE_ATTR_2_RW(fan2_beep, beep, 0x5b, 1);817static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 0x12);818static SENSOR_DEVICE_ATTR_2_RW(fan3_min, fan_min, 0x4b, 0x4e);819static SENSOR_DEVICE_ATTR_2_RO(fan3_alarm, alarm, 0x1a, 2);820static SENSOR_DEVICE_ATTR_2_RW(fan3_beep, beep, 0x5b, 2);821 822/* 7.2.89 Fan Control Output Type */823static SENSOR_DEVICE_ATTR_RO(pwm1_mode, pwm_mode, 0);824static SENSOR_DEVICE_ATTR_RO(pwm2_mode, pwm_mode, 1);825static SENSOR_DEVICE_ATTR_RO(pwm3_mode, pwm_mode, 2);826 827/* 7.2.91... Fan Control Output Value */828static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, REG_PWM(0));829static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, REG_PWM(1));830static SENSOR_DEVICE_ATTR_RW(pwm3, pwm, REG_PWM(2));831 832/* 7.2.95... Temperature to Fan mapping Relationships Register */833static SENSOR_DEVICE_ATTR_RW(pwm1_enable, pwm_enable, 0);834static SENSOR_DEVICE_ATTR_RW(pwm2_enable, pwm_enable, 1);835static SENSOR_DEVICE_ATTR_RW(pwm3_enable, pwm_enable, 2);836 837static struct attribute *nct7802_fan_attrs[] = {838 &sensor_dev_attr_fan1_input.dev_attr.attr,839 &sensor_dev_attr_fan1_min.dev_attr.attr,840 &sensor_dev_attr_fan1_alarm.dev_attr.attr,841 &sensor_dev_attr_fan1_beep.dev_attr.attr,842 &sensor_dev_attr_fan2_input.dev_attr.attr,843 &sensor_dev_attr_fan2_min.dev_attr.attr,844 &sensor_dev_attr_fan2_alarm.dev_attr.attr,845 &sensor_dev_attr_fan2_beep.dev_attr.attr,846 &sensor_dev_attr_fan3_input.dev_attr.attr,847 &sensor_dev_attr_fan3_min.dev_attr.attr,848 &sensor_dev_attr_fan3_alarm.dev_attr.attr,849 &sensor_dev_attr_fan3_beep.dev_attr.attr,850 851 NULL852};853 854static umode_t nct7802_fan_is_visible(struct kobject *kobj,855 struct attribute *attr, int index)856{857 struct device *dev = kobj_to_dev(kobj);858 struct nct7802_data *data = dev_get_drvdata(dev);859 int fan = index / 4; /* 4 attributes per fan */860 unsigned int reg;861 int err;862 863 err = regmap_read(data->regmap, REG_FAN_ENABLE, ®);864 if (err < 0 || !(reg & (1 << fan)))865 return 0;866 867 return attr->mode;868}869 870static const struct attribute_group nct7802_fan_group = {871 .attrs = nct7802_fan_attrs,872 .is_visible = nct7802_fan_is_visible,873};874 875static struct attribute *nct7802_pwm_attrs[] = {876 &sensor_dev_attr_pwm1_enable.dev_attr.attr,877 &sensor_dev_attr_pwm1_mode.dev_attr.attr,878 &sensor_dev_attr_pwm1.dev_attr.attr,879 &sensor_dev_attr_pwm2_enable.dev_attr.attr,880 &sensor_dev_attr_pwm2_mode.dev_attr.attr,881 &sensor_dev_attr_pwm2.dev_attr.attr,882 &sensor_dev_attr_pwm3_enable.dev_attr.attr,883 &sensor_dev_attr_pwm3_mode.dev_attr.attr,884 &sensor_dev_attr_pwm3.dev_attr.attr,885 NULL886};887 888static const struct attribute_group nct7802_pwm_group = {889 .attrs = nct7802_pwm_attrs,890};891 892/* 7.2.115... 0x80-0x83, 0x84 Temperature (X-axis) transition */893static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point1_temp, temp, 0x80, 0);894static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point2_temp, temp, 0x81, 0);895static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point3_temp, temp, 0x82, 0);896static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point4_temp, temp, 0x83, 0);897static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point5_temp, temp, 0x84, 0);898 899/* 7.2.120... 0x85-0x88 PWM (Y-axis) transition */900static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point1_pwm, pwm, 0x85);901static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_pwm, pwm, 0x86);902static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point3_pwm, pwm, 0x87);903static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point4_pwm, pwm, 0x88);904static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point5_pwm, pwm, 0);905 906/* 7.2.124 Table 2 X-axis Transition Point 1 Register */907static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point1_temp, temp, 0x90, 0);908static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point2_temp, temp, 0x91, 0);909static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point3_temp, temp, 0x92, 0);910static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point4_temp, temp, 0x93, 0);911static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point5_temp, temp, 0x94, 0);912 913/* 7.2.129 Table 2 Y-axis Transition Point 1 Register */914static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point1_pwm, pwm, 0x95);915static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point2_pwm, pwm, 0x96);916static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point3_pwm, pwm, 0x97);917static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point4_pwm, pwm, 0x98);918static SENSOR_DEVICE_ATTR_RO(pwm2_auto_point5_pwm, pwm, 0);919 920/* 7.2.133 Table 3 X-axis Transition Point 1 Register */921static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point1_temp, temp, 0xA0, 0);922static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point2_temp, temp, 0xA1, 0);923static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point3_temp, temp, 0xA2, 0);924static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point4_temp, temp, 0xA3, 0);925static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point5_temp, temp, 0xA4, 0);926 927/* 7.2.138 Table 3 Y-axis Transition Point 1 Register */928static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point1_pwm, pwm, 0xA5);929static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point2_pwm, pwm, 0xA6);930static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point3_pwm, pwm, 0xA7);931static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point4_pwm, pwm, 0xA8);932static SENSOR_DEVICE_ATTR_RO(pwm3_auto_point5_pwm, pwm, 0);933 934static struct attribute *nct7802_auto_point_attrs[] = {935 &sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,936 &sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,937 &sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr,938 &sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr,939 &sensor_dev_attr_pwm1_auto_point5_temp.dev_attr.attr,940 941 &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,942 &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,943 &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,944 &sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr,945 &sensor_dev_attr_pwm1_auto_point5_pwm.dev_attr.attr,946 947 &sensor_dev_attr_pwm2_auto_point1_temp.dev_attr.attr,948 &sensor_dev_attr_pwm2_auto_point2_temp.dev_attr.attr,949 &sensor_dev_attr_pwm2_auto_point3_temp.dev_attr.attr,950 &sensor_dev_attr_pwm2_auto_point4_temp.dev_attr.attr,951 &sensor_dev_attr_pwm2_auto_point5_temp.dev_attr.attr,952 953 &sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr,954 &sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr,955 &sensor_dev_attr_pwm2_auto_point3_pwm.dev_attr.attr,956 &sensor_dev_attr_pwm2_auto_point4_pwm.dev_attr.attr,957 &sensor_dev_attr_pwm2_auto_point5_pwm.dev_attr.attr,958 959 &sensor_dev_attr_pwm3_auto_point1_temp.dev_attr.attr,960 &sensor_dev_attr_pwm3_auto_point2_temp.dev_attr.attr,961 &sensor_dev_attr_pwm3_auto_point3_temp.dev_attr.attr,962 &sensor_dev_attr_pwm3_auto_point4_temp.dev_attr.attr,963 &sensor_dev_attr_pwm3_auto_point5_temp.dev_attr.attr,964 965 &sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr,966 &sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr,967 &sensor_dev_attr_pwm3_auto_point3_pwm.dev_attr.attr,968 &sensor_dev_attr_pwm3_auto_point4_pwm.dev_attr.attr,969 &sensor_dev_attr_pwm3_auto_point5_pwm.dev_attr.attr,970 971 NULL972};973 974static const struct attribute_group nct7802_auto_point_group = {975 .attrs = nct7802_auto_point_attrs,976};977 978static const struct attribute_group *nct7802_groups[] = {979 &nct7802_temp_group,980 &nct7802_in_group,981 &nct7802_fan_group,982 &nct7802_pwm_group,983 &nct7802_auto_point_group,984 NULL985};986 987static int nct7802_detect(struct i2c_client *client,988 struct i2c_board_info *info)989{990 int reg;991 992 /*993 * Chip identification registers are only available in bank 0,994 * so only attempt chip detection if bank 0 is selected995 */996 reg = i2c_smbus_read_byte_data(client, REG_BANK);997 if (reg != 0x00)998 return -ENODEV;999 1000 reg = i2c_smbus_read_byte_data(client, REG_VENDOR_ID);1001 if (reg != 0x50)1002 return -ENODEV;1003 1004 reg = i2c_smbus_read_byte_data(client, REG_CHIP_ID);1005 if (reg != 0xc3)1006 return -ENODEV;1007 1008 reg = i2c_smbus_read_byte_data(client, REG_VERSION_ID);1009 if (reg < 0 || (reg & 0xf0) != 0x20)1010 return -ENODEV;1011 1012 /* Also validate lower bits of voltage and temperature registers */1013 reg = i2c_smbus_read_byte_data(client, REG_TEMP_LSB);1014 if (reg < 0 || (reg & 0x1f))1015 return -ENODEV;1016 1017 reg = i2c_smbus_read_byte_data(client, REG_TEMP_PECI_LSB);1018 if (reg < 0 || (reg & 0x3f))1019 return -ENODEV;1020 1021 reg = i2c_smbus_read_byte_data(client, REG_VOLTAGE_LOW);1022 if (reg < 0 || (reg & 0x3f))1023 return -ENODEV;1024 1025 strscpy(info->type, "nct7802", I2C_NAME_SIZE);1026 return 0;1027}1028 1029static bool nct7802_regmap_is_volatile(struct device *dev, unsigned int reg)1030{1031 return (reg != REG_BANK && reg <= 0x20) ||1032 (reg >= REG_PWM(0) && reg <= REG_PWM(2));1033}1034 1035static const struct regmap_config nct7802_regmap_config = {1036 .reg_bits = 8,1037 .val_bits = 8,1038 .cache_type = REGCACHE_MAPLE,1039 .volatile_reg = nct7802_regmap_is_volatile,1040};1041 1042static int nct7802_get_channel_config(struct device *dev,1043 struct device_node *node, u8 *mode_mask,1044 u8 *mode_val)1045{1046 u32 reg;1047 const char *type_str, *md_str;1048 u8 md;1049 1050 if (!node->name || of_node_cmp(node->name, "channel"))1051 return 0;1052 1053 if (of_property_read_u32(node, "reg", ®)) {1054 dev_err(dev, "Could not read reg value for '%s'\n",1055 node->full_name);1056 return -EINVAL;1057 }1058 1059 if (reg > 3) {1060 dev_err(dev, "Invalid reg (%u) in '%s'\n", reg,1061 node->full_name);1062 return -EINVAL;1063 }1064 1065 if (reg == 0) {1066 if (!of_device_is_available(node))1067 *mode_val &= ~MODE_LTD_EN;1068 else1069 *mode_val |= MODE_LTD_EN;1070 *mode_mask |= MODE_LTD_EN;1071 return 0;1072 }1073 1074 /* At this point we have reg >= 1 && reg <= 3 */1075 1076 if (!of_device_is_available(node)) {1077 *mode_val &= ~(MODE_RTD_MASK << MODE_BIT_OFFSET_RTD(reg - 1));1078 *mode_mask |= MODE_RTD_MASK << MODE_BIT_OFFSET_RTD(reg - 1);1079 return 0;1080 }1081 1082 if (of_property_read_string(node, "sensor-type", &type_str)) {1083 dev_err(dev, "No type for '%s'\n", node->full_name);1084 return -EINVAL;1085 }1086 1087 if (!strcmp(type_str, "voltage")) {1088 *mode_val |= (RTD_MODE_VOLTAGE & MODE_RTD_MASK)1089 << MODE_BIT_OFFSET_RTD(reg - 1);1090 *mode_mask |= MODE_RTD_MASK << MODE_BIT_OFFSET_RTD(reg - 1);1091 return 0;1092 }1093 1094 if (strcmp(type_str, "temperature")) {1095 dev_err(dev, "Invalid type '%s' for '%s'\n", type_str,1096 node->full_name);1097 return -EINVAL;1098 }1099 1100 if (reg == 3) {1101 /* RTD3 only supports thermistor mode */1102 md = RTD_MODE_THERMISTOR;1103 } else {1104 if (of_property_read_string(node, "temperature-mode",1105 &md_str)) {1106 dev_err(dev, "No mode for '%s'\n", node->full_name);1107 return -EINVAL;1108 }1109 1110 if (!strcmp(md_str, "thermal-diode"))1111 md = RTD_MODE_CURRENT;1112 else if (!strcmp(md_str, "thermistor"))1113 md = RTD_MODE_THERMISTOR;1114 else {1115 dev_err(dev, "Invalid mode '%s' for '%s'\n", md_str,1116 node->full_name);1117 return -EINVAL;1118 }1119 }1120 1121 *mode_val |= (md & MODE_RTD_MASK) << MODE_BIT_OFFSET_RTD(reg - 1);1122 *mode_mask |= MODE_RTD_MASK << MODE_BIT_OFFSET_RTD(reg - 1);1123 1124 return 0;1125}1126 1127static int nct7802_configure_channels(struct device *dev,1128 struct nct7802_data *data)1129{1130 /* Enable local temperature sensor by default */1131 u8 mode_mask = MODE_LTD_EN, mode_val = MODE_LTD_EN;1132 int err;1133 1134 if (dev->of_node) {1135 for_each_child_of_node_scoped(dev->of_node, node) {1136 err = nct7802_get_channel_config(dev, node, &mode_mask,1137 &mode_val);1138 if (err)1139 return err;1140 }1141 }1142 1143 return regmap_update_bits(data->regmap, REG_MODE, mode_mask, mode_val);1144}1145 1146static int nct7802_init_chip(struct device *dev, struct nct7802_data *data)1147{1148 int err;1149 1150 /* Enable ADC */1151 err = regmap_update_bits(data->regmap, REG_START, 0x01, 0x01);1152 if (err)1153 return err;1154 1155 err = nct7802_configure_channels(dev, data);1156 if (err)1157 return err;1158 1159 /* Enable Vcore and VCC voltage monitoring */1160 return regmap_update_bits(data->regmap, REG_VMON_ENABLE, 0x03, 0x03);1161}1162 1163static int nct7802_probe(struct i2c_client *client)1164{1165 struct device *dev = &client->dev;1166 struct nct7802_data *data;1167 struct device *hwmon_dev;1168 int ret;1169 1170 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);1171 if (data == NULL)1172 return -ENOMEM;1173 1174 data->regmap = devm_regmap_init_i2c(client, &nct7802_regmap_config);1175 if (IS_ERR(data->regmap))1176 return PTR_ERR(data->regmap);1177 1178 mutex_init(&data->access_lock);1179 mutex_init(&data->in_alarm_lock);1180 1181 ret = nct7802_init_chip(dev, data);1182 if (ret < 0)1183 return ret;1184 1185 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,1186 data,1187 nct7802_groups);1188 return PTR_ERR_OR_ZERO(hwmon_dev);1189}1190 1191static const unsigned short nct7802_address_list[] = {1192 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END1193};1194 1195static const struct i2c_device_id nct7802_idtable[] = {1196 { "nct7802" },1197 { }1198};1199MODULE_DEVICE_TABLE(i2c, nct7802_idtable);1200 1201static struct i2c_driver nct7802_driver = {1202 .class = I2C_CLASS_HWMON,1203 .driver = {1204 .name = DRVNAME,1205 },1206 .detect = nct7802_detect,1207 .probe = nct7802_probe,1208 .id_table = nct7802_idtable,1209 .address_list = nct7802_address_list,1210};1211 1212module_i2c_driver(nct7802_driver);1213 1214MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");1215MODULE_DESCRIPTION("NCT7802Y Hardware Monitoring Driver");1216MODULE_LICENSE("GPL v2");1217