/* * nct7802 - Driver for Nuvoton NCT7802Y * * Copyright (C) 2014 Guenter Roeck <linux@roeck-us.net> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/err.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/jiffies.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/regmap.h> #include <linux/slab.h> #define DRVNAME "nct7802" static const u8 REG_VOLTAGE[5] = { 0x09, 0x0a, 0x0c, 0x0d, 0x0e }; static const u8 REG_VOLTAGE_LIMIT_LSB[2][5] = { { 0x40, 0x00, 0x42, 0x44, 0x46 }, { 0x3f, 0x00, 0x41, 0x43, 0x45 }, }; static const u8 REG_VOLTAGE_LIMIT_MSB[5] = { 0x48, 0x00, 0x47, 0x47, 0x48 }; static const u8 REG_VOLTAGE_LIMIT_MSB_SHIFT[2][5] = { { 0, 0, 4, 0, 4 }, { 2, 0, 6, 2, 6 }, }; #define REG_BANK 0x00 #define REG_TEMP_LSB 0x05 #define REG_TEMP_PECI_LSB 0x08 #define REG_VOLTAGE_LOW 0x0f #define REG_FANCOUNT_LOW 0x13 #define REG_START 0x21 #define REG_MODE 0x22 #define REG_PECI_ENABLE 0x23 #define REG_FAN_ENABLE 0x24 #define REG_VMON_ENABLE 0x25 #define REG_VENDOR_ID 0xfd #define REG_CHIP_ID 0xfe #define REG_VERSION_ID 0xff /* * Data structures and manipulation thereof */ struct nct7802_data { struct regmap *regmap; struct mutex access_lock; /* for multi-byte read and write operations */ }; static int nct7802_read_temp(struct nct7802_data *data, u8 reg_temp, u8 reg_temp_low, int *temp) { unsigned int t1, t2 = 0; int err; *temp = 0; mutex_lock(&data->access_lock); err = regmap_read(data->regmap, reg_temp, &t1); if (err < 0) goto abort; t1 <<= 8; if (reg_temp_low) { /* 11 bit data */ err = regmap_read(data->regmap, reg_temp_low, &t2); if (err < 0) goto abort; } t1 |= t2 & 0xe0; *temp = (s16)t1 / 32 * 125; abort: mutex_unlock(&data->access_lock); return err; } static int nct7802_read_fan(struct nct7802_data *data, u8 reg_fan) { unsigned int f1, f2; int ret; mutex_lock(&data->access_lock); ret = regmap_read(data->regmap, reg_fan, &f1); if (ret < 0) goto abort; ret = regmap_read(data->regmap, REG_FANCOUNT_LOW, &f2); if (ret < 0) goto abort; ret = (f1 << 5) | (f2 >> 3); /* convert fan count to rpm */ if (ret == 0x1fff) /* maximum value, assume fan is stopped */ ret = 0; else if (ret) ret = DIV_ROUND_CLOSEST(1350000U, ret); abort: mutex_unlock(&data->access_lock); return ret; } static int nct7802_read_fan_min(struct nct7802_data *data, u8 reg_fan_low, u8 reg_fan_high) { unsigned int f1, f2; int ret; mutex_lock(&data->access_lock); ret = regmap_read(data->regmap, reg_fan_low, &f1); if (ret < 0) goto abort; ret = regmap_read(data->regmap, reg_fan_high, &f2); if (ret < 0) goto abort; ret = f1 | ((f2 & 0xf8) << 5); /* convert fan count to rpm */ if (ret == 0x1fff) /* maximum value, assume no limit */ ret = 0; else if (ret) ret = DIV_ROUND_CLOSEST(1350000U, ret); abort: mutex_unlock(&data->access_lock); return ret; } static int nct7802_write_fan_min(struct nct7802_data *data, u8 reg_fan_low, u8 reg_fan_high, unsigned int limit) { int err; if (limit) limit = DIV_ROUND_CLOSEST(1350000U, limit); else limit = 0x1fff; limit = clamp_val(limit, 0, 0x1fff); mutex_lock(&data->access_lock); err = regmap_write(data->regmap, reg_fan_low, limit & 0xff); if (err < 0) goto abort; err = regmap_write(data->regmap, reg_fan_high, (limit & 0x1f00) >> 5); abort: mutex_unlock(&data->access_lock); return err; } static u8 nct7802_vmul[] = { 4, 2, 2, 2, 2 }; static int nct7802_read_voltage(struct nct7802_data *data, int nr, int index) { unsigned int v1, v2; int ret; mutex_lock(&data->access_lock); if (index == 0) { /* voltage */ ret = regmap_read(data->regmap, REG_VOLTAGE[nr], &v1); if (ret < 0) goto abort; ret = regmap_read(data->regmap, REG_VOLTAGE_LOW, &v2); if (ret < 0) goto abort; ret = ((v1 << 2) | (v2 >> 6)) * nct7802_vmul[nr]; } else { /* limit */ int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr]; ret = regmap_read(data->regmap, REG_VOLTAGE_LIMIT_LSB[index - 1][nr], &v1); if (ret < 0) goto abort; ret = regmap_read(data->regmap, REG_VOLTAGE_LIMIT_MSB[nr], &v2); if (ret < 0) goto abort; ret = (v1 | ((v2 << shift) & 0x300)) * nct7802_vmul[nr]; } abort: mutex_unlock(&data->access_lock); return ret; } static int nct7802_write_voltage(struct nct7802_data *data, int nr, int index, unsigned int voltage) { int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr]; int err; voltage = DIV_ROUND_CLOSEST(voltage, nct7802_vmul[nr]); voltage = clamp_val(voltage, 0, 0x3ff); mutex_lock(&data->access_lock); err = regmap_write(data->regmap, REG_VOLTAGE_LIMIT_LSB[index - 1][nr], voltage & 0xff); if (err < 0) goto abort; err = regmap_update_bits(data->regmap, REG_VOLTAGE_LIMIT_MSB[nr], 0x0300 >> shift, (voltage & 0x0300) >> shift); abort: mutex_unlock(&data->access_lock); return err; } static ssize_t show_in(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); struct nct7802_data *data = dev_get_drvdata(dev); int voltage; voltage = nct7802_read_voltage(data, sattr->nr, sattr->index); if (voltage < 0) return voltage; return sprintf(buf, "%d\n", voltage); } static ssize_t store_in(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); struct nct7802_data *data = dev_get_drvdata(dev); int index = sattr->index; int nr = sattr->nr; unsigned long val; int err; err = kstrtoul(buf, 10, &val); if (err < 0) return err; err = nct7802_write_voltage(data, nr, index, val); return err ? : count; } static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf) { struct nct7802_data *data = dev_get_drvdata(dev); struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); int err, temp; err = nct7802_read_temp(data, sattr->nr, sattr->index, &temp); if (err < 0) return err; return sprintf(buf, "%d\n", temp); } static ssize_t store_temp(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); struct nct7802_data *data = dev_get_drvdata(dev); int nr = sattr->nr; long val; int err; err = kstrtol(buf, 10, &val); if (err < 0) return err; val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127); err = regmap_write(data->regmap, nr, val & 0xff); return err ? : count; } static ssize_t show_fan(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr); struct nct7802_data *data = dev_get_drvdata(dev); int speed; speed = nct7802_read_fan(data, sattr->index); if (speed < 0) return speed; return sprintf(buf, "%d\n", speed); } static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); struct nct7802_data *data = dev_get_drvdata(dev); int speed; speed = nct7802_read_fan_min(data, sattr->nr, sattr->index); if (speed < 0) return speed; return sprintf(buf, "%d\n", speed); } static ssize_t store_fan_min(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); struct nct7802_data *data = dev_get_drvdata(dev); unsigned long val; int err; err = kstrtoul(buf, 10, &val); if (err < 0) return err; err = nct7802_write_fan_min(data, sattr->nr, sattr->index, val); return err ? : count; } static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, char *buf) { struct nct7802_data *data = dev_get_drvdata(dev); struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); int bit = sattr->index; unsigned int val; int ret; ret = regmap_read(data->regmap, sattr->nr, &val); if (ret < 0) return ret; return sprintf(buf, "%u\n", !!(val & (1 << bit))); } static ssize_t show_beep(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); struct nct7802_data *data = dev_get_drvdata(dev); unsigned int regval; int err; err = regmap_read(data->regmap, sattr->nr, ®val); if (err) return err; return sprintf(buf, "%u\n", !!(regval & (1 << sattr->index))); } static ssize_t store_beep(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); struct nct7802_data *data = dev_get_drvdata(dev); unsigned long val; int err; err = kstrtoul(buf, 10, &val); if (err < 0) return err; if (val > 1) return -EINVAL; err = regmap_update_bits(data->regmap, sattr->nr, 1 << sattr->index, val ? 1 << sattr->index : 0); return err ? : count; } static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0x01, REG_TEMP_LSB); static SENSOR_DEVICE_ATTR_2(temp1_min, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x31, 0); static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x30, 0); static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x3a, 0); static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0x02, REG_TEMP_LSB); static SENSOR_DEVICE_ATTR_2(temp2_min, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x33, 0); static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x32, 0); static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x3b, 0); static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0x03, REG_TEMP_LSB); static SENSOR_DEVICE_ATTR_2(temp3_min, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x35, 0); static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x34, 0); static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x3c, 0); static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 0x04, 0); static SENSOR_DEVICE_ATTR_2(temp4_min, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x37, 0); static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x36, 0); static SENSOR_DEVICE_ATTR_2(temp4_crit, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x3d, 0); static SENSOR_DEVICE_ATTR_2(temp5_input, S_IRUGO, show_temp, NULL, 0x06, REG_TEMP_PECI_LSB); static SENSOR_DEVICE_ATTR_2(temp5_min, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x39, 0); static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x38, 0); static SENSOR_DEVICE_ATTR_2(temp5_crit, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x3e, 0); static SENSOR_DEVICE_ATTR_2(temp6_input, S_IRUGO, show_temp, NULL, 0x07, REG_TEMP_PECI_LSB); static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 0x18, 0); static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 0x18, 1); static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_alarm, NULL, 0x18, 2); static SENSOR_DEVICE_ATTR_2(temp4_min_alarm, S_IRUGO, show_alarm, NULL, 0x18, 3); static SENSOR_DEVICE_ATTR_2(temp5_min_alarm, S_IRUGO, show_alarm, NULL, 0x18, 4); static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 0x19, 0); static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 0x19, 1); static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 0x19, 2); static SENSOR_DEVICE_ATTR_2(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 0x19, 3); static SENSOR_DEVICE_ATTR_2(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 0x19, 4); static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0x1b, 0); static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 0x1b, 1); static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 0x1b, 2); static SENSOR_DEVICE_ATTR_2(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 0x1b, 3); static SENSOR_DEVICE_ATTR_2(temp5_crit_alarm, S_IRUGO, show_alarm, NULL, 0x1b, 4); static SENSOR_DEVICE_ATTR_2(temp1_fault, S_IRUGO, show_alarm, NULL, 0x17, 0); static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_alarm, NULL, 0x17, 1); static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_alarm, NULL, 0x17, 2); static SENSOR_DEVICE_ATTR_2(temp1_beep, S_IRUGO | S_IWUSR, show_beep, store_beep, 0x5c, 0); static SENSOR_DEVICE_ATTR_2(temp2_beep, S_IRUGO | S_IWUSR, show_beep, store_beep, 0x5c, 1); static SENSOR_DEVICE_ATTR_2(temp3_beep, S_IRUGO | S_IWUSR, show_beep, store_beep, 0x5c, 2); static SENSOR_DEVICE_ATTR_2(temp4_beep, S_IRUGO | S_IWUSR, show_beep, store_beep, 0x5c, 3); static SENSOR_DEVICE_ATTR_2(temp5_beep, S_IRUGO | S_IWUSR, show_beep, store_beep, 0x5c, 4); static SENSOR_DEVICE_ATTR_2(temp6_beep, S_IRUGO | S_IWUSR, show_beep, store_beep, 0x5c, 5); static struct attribute *nct7802_temp_attrs[] = { &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp1_min.dev_attr.attr, &sensor_dev_attr_temp1_max.dev_attr.attr, &sensor_dev_attr_temp1_crit.dev_attr.attr, &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, &sensor_dev_attr_temp1_fault.dev_attr.attr, &sensor_dev_attr_temp1_beep.dev_attr.attr, &sensor_dev_attr_temp2_input.dev_attr.attr, /* 9 */ &sensor_dev_attr_temp2_min.dev_attr.attr, &sensor_dev_attr_temp2_max.dev_attr.attr, &sensor_dev_attr_temp2_crit.dev_attr.attr, &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, &sensor_dev_attr_temp2_fault.dev_attr.attr, &sensor_dev_attr_temp2_beep.dev_attr.attr, &sensor_dev_attr_temp3_input.dev_attr.attr, /* 18 */ &sensor_dev_attr_temp3_min.dev_attr.attr, &sensor_dev_attr_temp3_max.dev_attr.attr, &sensor_dev_attr_temp3_crit.dev_attr.attr, &sensor_dev_attr_temp3_min_alarm.dev_attr.attr, &sensor_dev_attr_temp3_max_alarm.dev_attr.attr, &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr, &sensor_dev_attr_temp3_fault.dev_attr.attr, &sensor_dev_attr_temp3_beep.dev_attr.attr, &sensor_dev_attr_temp4_input.dev_attr.attr, /* 27 */ &sensor_dev_attr_temp4_min.dev_attr.attr, &sensor_dev_attr_temp4_max.dev_attr.attr, &sensor_dev_attr_temp4_crit.dev_attr.attr, &sensor_dev_attr_temp4_min_alarm.dev_attr.attr, &sensor_dev_attr_temp4_max_alarm.dev_attr.attr, &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr, &sensor_dev_attr_temp4_beep.dev_attr.attr, &sensor_dev_attr_temp5_input.dev_attr.attr, /* 35 */ &sensor_dev_attr_temp5_min.dev_attr.attr, &sensor_dev_attr_temp5_max.dev_attr.attr, &sensor_dev_attr_temp5_crit.dev_attr.attr, &sensor_dev_attr_temp5_min_alarm.dev_attr.attr, &sensor_dev_attr_temp5_max_alarm.dev_attr.attr, &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr, &sensor_dev_attr_temp5_beep.dev_attr.attr, &sensor_dev_attr_temp6_input.dev_attr.attr, /* 43 */ &sensor_dev_attr_temp6_beep.dev_attr.attr, NULL }; static umode_t nct7802_temp_is_visible(struct kobject *kobj, struct attribute *attr, int index) { struct device *dev = container_of(kobj, struct device, kobj); struct nct7802_data *data = dev_get_drvdata(dev); unsigned int reg; int err; err = regmap_read(data->regmap, REG_MODE, ®); if (err < 0) return 0; if (index < 9 && (reg & 03) != 0x01 && (reg & 0x03) != 0x02) /* RD1 */ return 0; if (index >= 9 && index < 18 && (reg & 0x0c) != 0x04 && (reg & 0x0c) != 0x08) /* RD2 */ return 0; if (index >= 18 && index < 27 && (reg & 0x30) != 0x20) /* RD3 */ return 0; if (index >= 27 && index < 35) /* local */ return attr->mode; err = regmap_read(data->regmap, REG_PECI_ENABLE, ®); if (err < 0) return 0; if (index >= 35 && index < 43 && !(reg & 0x01)) /* PECI 0 */ return 0; if (index >= 0x43 && (!(reg & 0x02))) /* PECI 1 */ return 0; return attr->mode; } static struct attribute_group nct7802_temp_group = { .attrs = nct7802_temp_attrs, .is_visible = nct7802_temp_is_visible, }; static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO, show_in, NULL, 0, 0); static SENSOR_DEVICE_ATTR_2(in0_min, S_IRUGO | S_IWUSR, show_in, store_in, 0, 1); static SENSOR_DEVICE_ATTR_2(in0_max, S_IRUGO | S_IWUSR, show_in, store_in, 0, 2); static SENSOR_DEVICE_ATTR_2(in0_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 3); static SENSOR_DEVICE_ATTR_2(in0_beep, S_IRUGO | S_IWUSR, show_beep, store_beep, 0x5a, 3); static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO, show_in, NULL, 1, 0); static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO, show_in, NULL, 2, 0); static SENSOR_DEVICE_ATTR_2(in2_min, S_IRUGO | S_IWUSR, show_in, store_in, 2, 1); static SENSOR_DEVICE_ATTR_2(in2_max, S_IRUGO | S_IWUSR, show_in, store_in, 2, 2); static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 0); static SENSOR_DEVICE_ATTR_2(in2_beep, S_IRUGO | S_IWUSR, show_beep, store_beep, 0x5a, 0); static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO, show_in, NULL, 3, 0); static SENSOR_DEVICE_ATTR_2(in3_min, S_IRUGO | S_IWUSR, show_in, store_in, 3, 1); static SENSOR_DEVICE_ATTR_2(in3_max, S_IRUGO | S_IWUSR, show_in, store_in, 3, 2); static SENSOR_DEVICE_ATTR_2(in3_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 1); static SENSOR_DEVICE_ATTR_2(in3_beep, S_IRUGO | S_IWUSR, show_beep, store_beep, 0x5a, 1); static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO, show_in, NULL, 4, 0); static SENSOR_DEVICE_ATTR_2(in4_min, S_IRUGO | S_IWUSR, show_in, store_in, 4, 1); static SENSOR_DEVICE_ATTR_2(in4_max, S_IRUGO | S_IWUSR, show_in, store_in, 4, 2); static SENSOR_DEVICE_ATTR_2(in4_alarm, S_IRUGO, show_alarm, NULL, 0x1e, 2); static SENSOR_DEVICE_ATTR_2(in4_beep, S_IRUGO | S_IWUSR, show_beep, store_beep, 0x5a, 2); static struct attribute *nct7802_in_attrs[] = { &sensor_dev_attr_in0_input.dev_attr.attr, &sensor_dev_attr_in0_min.dev_attr.attr, &sensor_dev_attr_in0_max.dev_attr.attr, &sensor_dev_attr_in0_alarm.dev_attr.attr, &sensor_dev_attr_in0_beep.dev_attr.attr, &sensor_dev_attr_in1_input.dev_attr.attr, /* 5 */ &sensor_dev_attr_in2_input.dev_attr.attr, /* 6 */ &sensor_dev_attr_in2_min.dev_attr.attr, &sensor_dev_attr_in2_max.dev_attr.attr, &sensor_dev_attr_in2_alarm.dev_attr.attr, &sensor_dev_attr_in2_beep.dev_attr.attr, &sensor_dev_attr_in3_input.dev_attr.attr, /* 11 */ &sensor_dev_attr_in3_min.dev_attr.attr, &sensor_dev_attr_in3_max.dev_attr.attr, &sensor_dev_attr_in3_alarm.dev_attr.attr, &sensor_dev_attr_in3_beep.dev_attr.attr, &sensor_dev_attr_in4_input.dev_attr.attr, /* 17 */ &sensor_dev_attr_in4_min.dev_attr.attr, &sensor_dev_attr_in4_max.dev_attr.attr, &sensor_dev_attr_in4_alarm.dev_attr.attr, &sensor_dev_attr_in4_beep.dev_attr.attr, NULL, }; static umode_t nct7802_in_is_visible(struct kobject *kobj, struct attribute *attr, int index) { struct device *dev = container_of(kobj, struct device, kobj); struct nct7802_data *data = dev_get_drvdata(dev); unsigned int reg; int err; if (index < 6) /* VCC, VCORE */ return attr->mode; err = regmap_read(data->regmap, REG_MODE, ®); if (err < 0) return 0; if (index >= 6 && index < 11 && (reg & 0x03) != 0x03) /* VSEN1 */ return 0; if (index >= 11 && index < 17 && (reg & 0x0c) != 0x0c) /* VSEN2 */ return 0; if (index >= 17 && (reg & 0x30) != 0x30) /* VSEN3 */ return 0; return attr->mode; } static struct attribute_group nct7802_in_group = { .attrs = nct7802_in_attrs, .is_visible = nct7802_in_is_visible, }; static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0x10); static SENSOR_DEVICE_ATTR_2(fan1_min, S_IRUGO | S_IWUSR, show_fan_min, store_fan_min, 0x49, 0x4c); static SENSOR_DEVICE_ATTR_2(fan1_alarm, S_IRUGO, show_alarm, NULL, 0x1a, 0); static SENSOR_DEVICE_ATTR_2(fan1_beep, S_IRUGO | S_IWUSR, show_beep, store_beep, 0x5b, 0); static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 0x11); static SENSOR_DEVICE_ATTR_2(fan2_min, S_IRUGO | S_IWUSR, show_fan_min, store_fan_min, 0x4a, 0x4d); static SENSOR_DEVICE_ATTR_2(fan2_alarm, S_IRUGO, show_alarm, NULL, 0x1a, 1); static SENSOR_DEVICE_ATTR_2(fan2_beep, S_IRUGO | S_IWUSR, show_beep, store_beep, 0x5b, 1); static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 0x12); static SENSOR_DEVICE_ATTR_2(fan3_min, S_IRUGO | S_IWUSR, show_fan_min, store_fan_min, 0x4b, 0x4e); static SENSOR_DEVICE_ATTR_2(fan3_alarm, S_IRUGO, show_alarm, NULL, 0x1a, 2); static SENSOR_DEVICE_ATTR_2(fan3_beep, S_IRUGO | S_IWUSR, show_beep, store_beep, 0x5b, 2); static struct attribute *nct7802_fan_attrs[] = { &sensor_dev_attr_fan1_input.dev_attr.attr, &sensor_dev_attr_fan1_min.dev_attr.attr, &sensor_dev_attr_fan1_alarm.dev_attr.attr, &sensor_dev_attr_fan1_beep.dev_attr.attr, &sensor_dev_attr_fan2_input.dev_attr.attr, &sensor_dev_attr_fan2_min.dev_attr.attr, &sensor_dev_attr_fan2_alarm.dev_attr.attr, &sensor_dev_attr_fan2_beep.dev_attr.attr, &sensor_dev_attr_fan3_input.dev_attr.attr, &sensor_dev_attr_fan3_min.dev_attr.attr, &sensor_dev_attr_fan3_alarm.dev_attr.attr, &sensor_dev_attr_fan3_beep.dev_attr.attr, NULL }; static umode_t nct7802_fan_is_visible(struct kobject *kobj, struct attribute *attr, int index) { struct device *dev = container_of(kobj, struct device, kobj); struct nct7802_data *data = dev_get_drvdata(dev); int fan = index / 4; /* 4 attributes per fan */ unsigned int reg; int err; err = regmap_read(data->regmap, REG_FAN_ENABLE, ®); if (err < 0 || !(reg & (1 << fan))) return 0; return attr->mode; } static struct attribute_group nct7802_fan_group = { .attrs = nct7802_fan_attrs, .is_visible = nct7802_fan_is_visible, }; static const struct attribute_group *nct7802_groups[] = { &nct7802_temp_group, &nct7802_in_group, &nct7802_fan_group, NULL }; static int nct7802_detect(struct i2c_client *client, struct i2c_board_info *info) { int reg; /* * Chip identification registers are only available in bank 0, * so only attempt chip detection if bank 0 is selected */ reg = i2c_smbus_read_byte_data(client, REG_BANK); if (reg != 0x00) return -ENODEV; reg = i2c_smbus_read_byte_data(client, REG_VENDOR_ID); if (reg != 0x50) return -ENODEV; reg = i2c_smbus_read_byte_data(client, REG_CHIP_ID); if (reg != 0xc3) return -ENODEV; reg = i2c_smbus_read_byte_data(client, REG_VERSION_ID); if (reg < 0 || (reg & 0xf0) != 0x20) return -ENODEV; /* Also validate lower bits of voltage and temperature registers */ reg = i2c_smbus_read_byte_data(client, REG_TEMP_LSB); if (reg < 0 || (reg & 0x1f)) return -ENODEV; reg = i2c_smbus_read_byte_data(client, REG_TEMP_PECI_LSB); if (reg < 0 || (reg & 0x3f)) return -ENODEV; reg = i2c_smbus_read_byte_data(client, REG_VOLTAGE_LOW); if (reg < 0 || (reg & 0x3f)) return -ENODEV; strlcpy(info->type, "nct7802", I2C_NAME_SIZE); return 0; } static bool nct7802_regmap_is_volatile(struct device *dev, unsigned int reg) { return reg != REG_BANK && reg <= 0x20; } static const struct regmap_config nct7802_regmap_config = { .reg_bits = 8, .val_bits = 8, .cache_type = REGCACHE_RBTREE, .volatile_reg = nct7802_regmap_is_volatile, }; static int nct7802_init_chip(struct nct7802_data *data) { int err; /* Enable ADC */ err = regmap_update_bits(data->regmap, REG_START, 0x01, 0x01); if (err) return err; /* Enable local temperature sensor */ err = regmap_update_bits(data->regmap, REG_MODE, 0x40, 0x40); if (err) return err; /* Enable Vcore and VCC voltage monitoring */ return regmap_update_bits(data->regmap, REG_VMON_ENABLE, 0x03, 0x03); } static int nct7802_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct device *dev = &client->dev; struct nct7802_data *data; struct device *hwmon_dev; int ret; data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); if (data == NULL) return -ENOMEM; data->regmap = devm_regmap_init_i2c(client, &nct7802_regmap_config); if (IS_ERR(data->regmap)) return PTR_ERR(data->regmap); mutex_init(&data->access_lock); ret = nct7802_init_chip(data); if (ret < 0) return ret; hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, data, nct7802_groups); return PTR_ERR_OR_ZERO(hwmon_dev); } static const unsigned short nct7802_address_list[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END }; static const struct i2c_device_id nct7802_idtable[] = { { "nct7802", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, nct7802_idtable); static struct i2c_driver nct7802_driver = { .class = I2C_CLASS_HWMON, .driver = { .name = DRVNAME, }, .detect = nct7802_detect, .probe = nct7802_probe, .id_table = nct7802_idtable, .address_list = nct7802_address_list, }; module_i2c_driver(nct7802_driver); MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); MODULE_DESCRIPTION("NCT7802Y Hardware Monitoring Driver"); MODULE_LICENSE("GPL v2");