hwmon: (nct6775) Add support for automatic fan control
authorGuenter Roeck <linux@roeck-us.net>
Tue, 4 Dec 2012 17:04:52 +0000 (09:04 -0800)
committerGuenter Roeck <linux@roeck-us.net>
Mon, 8 Apr 2013 04:16:39 +0000 (21:16 -0700)
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Documentation/hwmon/nct6775
drivers/hwmon/nct6775.c

index 7c9f1d3..b4fe6bc 100644 (file)
@@ -87,6 +87,75 @@ pwm[1-5]_mode - controls if output is PWM or DC level
         * 0 DC output
         * 1 PWM output
 
+Common fan control attributes
+-----------------------------
+
+pwm[1-5]_temp_sel      Temperature source. Value is temperature sensor index.
+                       For example, select '1' for temp1_input.
+
+Thermal Cruise mode (2)
+-----------------------
+
+If the temperature is in the range defined by:
+
+pwm[1-5]_target_temp   Target temperature, unit millidegree Celsius
+                       (range 0 - 127000)
+pwm[1-5]_temp_tolerance
+                       Target temperature tolerance, unit millidegree Celsius
+
+there are no changes to fan speed. Once the temperature leaves the interval, fan
+speed increases (if temperature is higher that desired) or decreases (if
+temperature is lower than desired), using the following limits and time
+intervals.
+
+pwm[1-5]_start         fan pwm start value (range 1 - 255), to start fan
+                       when the temperature is above defined range.
+pwm[1-5]_floor         lowest fan pwm (range 0 - 255) if temperature is below
+                       the defined range. If set to 0, the fan is expected to
+                       stop if the temperature is below the defined range.
+pwm[1-5]_step_up_time  milliseconds before fan speed is increased
+pwm[1-5]_step_down_time        milliseconds before fan speed is decreased
+pwm[1-5]_stop_time     how many milliseconds must elapse to switch
+                       corresponding fan off (when the temperature was below
+                       defined range).
+
+Speed Cruise mode (3)
+---------------------
+
+This modes tries to keep the fan speed constant.
+
+fan[1-5]_target                Target fan speed
+fan[1-5]_tolerance
+                       Target speed tolerance
+
+
+Untested; use at your own risk.
+
+Smart Fan IV mode (5)
+---------------------
+
+This mode offers multiple slopes to control the fan speed. The slopes can be
+controlled by setting the pwm and temperature attributes. When the temperature
+rises, the chip will calculate the DC/PWM output based on the current slope.
+There are up to seven data points depending on the chip type. Subsequent data
+points should be set to higher temperatures and higher pwm values to achieve
+higher fan speeds with increasing temperature. The last data point reflects
+critical temperature mode, in which the fans should run at full speed.
+
+pwm[1-5]_auto_point[1-7]_pwm
+                       pwm value to be set if temperature reaches matching
+                       temperature range.
+pwm[1-5]_auto_point[1-7]_temp
+                       Temperature over which the matching pwm is enabled.
+pwm[1-5]_temp_tolerance
+                       Temperature tolerance, unit millidegree Celsius
+pwm[1-5]_crit_temp_tolerance
+                       Temperature tolerance for critical temperature,
+                       unit millidegree Celsius
+
+pwm[1-5]_step_up_time  milliseconds before fan speed is increased
+pwm[1-5]_step_down_time        milliseconds before fan speed is decreased
+
 Usage Notes
 -----------
 
index ad4ecc0..47b1d89 100644 (file)
@@ -215,8 +215,23 @@ static const u8 NCT6775_CR_CASEOPEN_CLR_MASK[] = { 0x20, 0x01 };
 static const u8 NCT6775_REG_PWM_MODE[] = { 0x04, 0x04, 0x12 };
 static const u8 NCT6775_PWM_MODE_MASK[] = { 0x01, 0x02, 0x01 };
 
-static const u16 NCT6775_REG_FAN_MODE[] = { 0x102, 0x202, 0x302, 0x802, 0x902 };
+/* Advanced Fan control, some values are common for all fans */
 
+static const u16 NCT6775_REG_TARGET[] = { 0x101, 0x201, 0x301, 0x801, 0x901 };
+static const u16 NCT6775_REG_FAN_MODE[] = { 0x102, 0x202, 0x302, 0x802, 0x902 };
+static const u16 NCT6775_REG_FAN_STEP_DOWN_TIME[] = {
+       0x103, 0x203, 0x303, 0x803, 0x903 };
+static const u16 NCT6775_REG_FAN_STEP_UP_TIME[] = {
+       0x104, 0x204, 0x304, 0x804, 0x904 };
+static const u16 NCT6775_REG_FAN_STOP_OUTPUT[] = {
+       0x105, 0x205, 0x305, 0x805, 0x905 };
+static const u16 NCT6775_REG_FAN_START_OUTPUT[]
+       = { 0x106, 0x206, 0x306, 0x806, 0x906 };
+static const u16 NCT6775_REG_FAN_MAX_OUTPUT[] = { 0x10a, 0x20a, 0x30a };
+static const u16 NCT6775_REG_FAN_STEP_OUTPUT[] = { 0x10b, 0x20b, 0x30b };
+
+static const u16 NCT6775_REG_FAN_STOP_TIME[] = {
+       0x107, 0x207, 0x307, 0x807, 0x907 };
 static const u16 NCT6775_REG_PWM[] = { 0x109, 0x209, 0x309, 0x809, 0x909 };
 static const u16 NCT6775_REG_PWM_READ[] = { 0x01, 0x03, 0x11, 0x13, 0x15 };
 
@@ -237,8 +252,26 @@ static const u16 NCT6775_REG_TEMP_OVER[ARRAY_SIZE(NCT6775_REG_TEMP)] = {
 static const u16 NCT6775_REG_TEMP_SOURCE[ARRAY_SIZE(NCT6775_REG_TEMP)] = {
        0x621, 0x622, 0x623, 0x624, 0x625, 0x626 };
 
+static const u16 NCT6775_REG_TEMP_SEL[] = {
+       0x100, 0x200, 0x300, 0x800, 0x900 };
+
 static const u16 NCT6775_REG_TEMP_OFFSET[] = { 0x454, 0x455, 0x456 };
 
+static const u16 NCT6775_REG_AUTO_TEMP[] = {
+       0x121, 0x221, 0x321, 0x821, 0x921 };
+static const u16 NCT6775_REG_AUTO_PWM[] = {
+       0x127, 0x227, 0x327, 0x827, 0x927 };
+
+#define NCT6775_AUTO_TEMP(data, nr, p) ((data)->REG_AUTO_TEMP[nr] + (p))
+#define NCT6775_AUTO_PWM(data, nr, p)  ((data)->REG_AUTO_PWM[nr] + (p))
+
+static const u16 NCT6775_REG_CRITICAL_ENAB[] = { 0x134, 0x234, 0x334 };
+
+static const u16 NCT6775_REG_CRITICAL_TEMP[] = {
+       0x135, 0x235, 0x335, 0x835, 0x935 };
+static const u16 NCT6775_REG_CRITICAL_TEMP_TOLERANCE[] = {
+       0x138, 0x238, 0x338, 0x838, 0x938 };
+
 static const char *const nct6775_temp_label[] = {
        "",
        "SYSTIN",
@@ -281,6 +314,9 @@ static const s8 NCT6776_ALARM_BITS[] = {
        4, 5, 13, -1, -1, -1,           /* temp1..temp6 */
        12, 9 };                        /* intrusion0, intrusion1 */
 
+static const u16 NCT6776_REG_TOLERANCE_H[] = {
+       0x10c, 0x20c, 0x30c, 0x80c, 0x90c };
+
 static const u8 NCT6776_REG_PWM_MODE[] = { 0x04, 0, 0 };
 static const u8 NCT6776_PWM_MODE_MASK[] = { 0x01, 0, 0 };
 
@@ -344,6 +380,11 @@ static const u16 NCT6779_REG_FAN[] = { 0x4b0, 0x4b2, 0x4b4, 0x4b6, 0x4b8 };
 static const u16 NCT6779_REG_FAN_PULSES[] = {
        0x644, 0x645, 0x646, 0x647, 0x648 };
 
+static const u16 NCT6779_REG_CRITICAL_PWM_ENABLE[] = {
+       0x136, 0x236, 0x336, 0x836, 0x936 };
+static const u16 NCT6779_REG_CRITICAL_PWM[] = {
+       0x137, 0x237, 0x337, 0x837, 0x937 };
+
 static const u16 NCT6779_REG_TEMP[] = { 0x27, 0x150 };
 static const u16 NCT6779_REG_TEMP_CONFIG[ARRAY_SIZE(NCT6779_REG_TEMP)] = {
        0x18, 0x152 };
@@ -412,6 +453,18 @@ static int pwm_enable_to_reg(enum pwm_enable mode)
  * Conversions
  */
 
+/* 1 is DC mode, output in ms */
+static unsigned int step_time_from_reg(u8 reg, u8 mode)
+{
+       return mode ? 400 * reg : 100 * reg;
+}
+
+static u8 step_time_to_reg(unsigned int msec, u8 mode)
+{
+       return clamp_val((mode ? (msec + 200) / 400 :
+                                       (msec + 50) / 100), 1, 255);
+}
+
 static unsigned int fan_from_reg8(u16 reg, unsigned int divreg)
 {
        if (reg == 0 || reg == 255)
@@ -444,6 +497,14 @@ static unsigned int fan_from_reg16(u16 reg, unsigned int divreg)
        return 1350000U / (reg << divreg);
 }
 
+static u16 fan_to_reg(u32 fan, unsigned int divreg)
+{
+       if (!fan)
+               return 0;
+
+       return (1350000U / fan) >> divreg;
+}
+
 static inline unsigned int
 div_from_reg(u8 reg)
 {
@@ -498,18 +559,31 @@ struct nct6775_data {
        const u16 *REG_VIN;
        const u16 *REG_IN_MINMAX[2];
 
+       const u16 *REG_TARGET;
        const u16 *REG_FAN;
        const u16 *REG_FAN_MODE;
        const u16 *REG_FAN_MIN;
        const u16 *REG_FAN_PULSES;
+       const u16 *REG_FAN_TIME[3];
+
+       const u16 *REG_TOLERANCE_H;
 
        const u8 *REG_PWM_MODE;
        const u8 *PWM_MODE_MASK;
 
-       const u16 *REG_PWM[1];  /* [0]=pwm */
+       const u16 *REG_PWM[5];  /* [0]=pwm, [1]=pwm_start, [2]=pwm_floor,
+                                * [3]=pwm_max, [4]=pwm_step
+                                */
        const u16 *REG_PWM_READ;
 
+       const u16 *REG_AUTO_TEMP;
+       const u16 *REG_AUTO_PWM;
+
+       const u16 *REG_CRITICAL_TEMP;
+       const u16 *REG_CRITICAL_TEMP_TOLERANCE;
+
        const u16 *REG_TEMP_SOURCE;     /* temp register sources */
+       const u16 *REG_TEMP_SEL;
        const u16 *REG_TEMP_OFFSET;
 
        const u16 *REG_ALARM;
@@ -551,7 +625,26 @@ struct nct6775_data {
                         * 4->SmartFan III
                         * 5->enhanced variable thermal cruise (SmartFan IV)
                         */
-       u8 pwm[1][5];   /* [0]=pwm */
+       u8 pwm[5][5];   /* [0]=pwm, [1]=pwm_start, [2]=pwm_floor,
+                        * [3]=pwm_max, [4]=pwm_step
+                        */
+
+       u8 target_temp[5];
+       u8 target_temp_mask;
+       u32 target_speed[5];
+       u32 target_speed_tolerance[5];
+       u8 speed_tolerance_limit;
+
+       u8 temp_tolerance[2][5];
+       u8 tolerance_mask;
+
+       u8 fan_time[3][5]; /* 0 = stop_time, 1 = step_up, 2 = step_down */
+
+       /* Automatic fan speed control registers */
+       int auto_pwm_num;
+       u8 auto_pwm[5][7];
+       u8 auto_temp[5][7];
+       u8 pwm_temp_sel[5];
 
        u8 vid;
        u8 vrm;
@@ -833,7 +926,7 @@ static void nct6775_update_pwm(struct device *dev)
 {
        struct nct6775_data *data = dev_get_drvdata(dev);
        int i, j;
-       int fanmodecfg;
+       int fanmodecfg, reg;
        bool duty_is_dc;
 
        for (i = 0; i < data->pwm_num; i++) {
@@ -856,6 +949,96 @@ static void nct6775_update_pwm(struct device *dev)
 
                data->pwm_enable[i] = reg_to_pwm_enable(data->pwm[0][i],
                                                        (fanmodecfg >> 4) & 7);
+
+               if (!data->temp_tolerance[0][i] ||
+                   data->pwm_enable[i] != speed_cruise)
+                       data->temp_tolerance[0][i] = fanmodecfg & 0x0f;
+               if (!data->target_speed_tolerance[i] ||
+                   data->pwm_enable[i] == speed_cruise) {
+                       u8 t = fanmodecfg & 0x0f;
+                       if (data->REG_TOLERANCE_H) {
+                               t |= (nct6775_read_value(data,
+                                     data->REG_TOLERANCE_H[i]) & 0x70) >> 1;
+                       }
+                       data->target_speed_tolerance[i] = t;
+               }
+
+               data->temp_tolerance[1][i] =
+                       nct6775_read_value(data,
+                                       data->REG_CRITICAL_TEMP_TOLERANCE[i]);
+
+               reg = nct6775_read_value(data, data->REG_TEMP_SEL[i]);
+               data->pwm_temp_sel[i] = reg & 0x1f;
+               /* If fan can stop, report floor as 0 */
+               if (reg & 0x80)
+                       data->pwm[2][i] = 0;
+       }
+}
+
+static void nct6775_update_pwm_limits(struct device *dev)
+{
+       struct nct6775_data *data = dev_get_drvdata(dev);
+       int i, j;
+       u8 reg;
+       u16 reg_t;
+
+       for (i = 0; i < data->pwm_num; i++) {
+               if (!(data->has_pwm & (1 << i)))
+                       continue;
+
+               for (j = 0; j < 3; j++) {
+                       data->fan_time[j][i] =
+                         nct6775_read_value(data, data->REG_FAN_TIME[j][i]);
+               }
+
+               reg_t = nct6775_read_value(data, data->REG_TARGET[i]);
+               /* Update only in matching mode or if never updated */
+               if (!data->target_temp[i] ||
+                   data->pwm_enable[i] == thermal_cruise)
+                       data->target_temp[i] = reg_t & data->target_temp_mask;
+               if (!data->target_speed[i] ||
+                   data->pwm_enable[i] == speed_cruise) {
+                       if (data->REG_TOLERANCE_H) {
+                               reg_t |= (nct6775_read_value(data,
+                                       data->REG_TOLERANCE_H[i]) & 0x0f) << 8;
+                       }
+                       data->target_speed[i] = reg_t;
+               }
+
+               for (j = 0; j < data->auto_pwm_num; j++) {
+                       data->auto_pwm[i][j] =
+                         nct6775_read_value(data,
+                                            NCT6775_AUTO_PWM(data, i, j));
+                       data->auto_temp[i][j] =
+                         nct6775_read_value(data,
+                                            NCT6775_AUTO_TEMP(data, i, j));
+               }
+
+               /* critical auto_pwm temperature data */
+               data->auto_temp[i][data->auto_pwm_num] =
+                       nct6775_read_value(data, data->REG_CRITICAL_TEMP[i]);
+
+               switch (data->kind) {
+               case nct6775:
+                       reg = nct6775_read_value(data,
+                                                NCT6775_REG_CRITICAL_ENAB[i]);
+                       data->auto_pwm[i][data->auto_pwm_num] =
+                                               (reg & 0x02) ? 0xff : 0x00;
+                       break;
+               case nct6776:
+                       data->auto_pwm[i][data->auto_pwm_num] = 0xff;
+                       break;
+               case nct6779:
+                       reg = nct6775_read_value(data,
+                                       NCT6779_REG_CRITICAL_PWM_ENABLE[i]);
+                       if (reg & 1)
+                               data->auto_pwm[i][data->auto_pwm_num] =
+                                 nct6775_read_value(data,
+                                       NCT6779_REG_CRITICAL_PWM[i]);
+                       else
+                               data->auto_pwm[i][data->auto_pwm_num] = 0xff;
+                       break;
+               }
        }
 }
 
@@ -905,6 +1088,7 @@ static struct nct6775_data *nct6775_update_device(struct device *dev)
                }
 
                nct6775_update_pwm(dev);
+               nct6775_update_pwm_limits(dev);
 
                /* Measured temperatures and limits */
                for (i = 0; i < NUM_TEMP; i++) {
@@ -1754,20 +1938,91 @@ store_pwm(struct device *dev, struct device_attribute *attr, const char *buf,
        int nr = sattr->nr;
        int index = sattr->index;
        unsigned long val;
+       int minval[5] = { 0, 1, 1, data->pwm[2][nr], 0 };
+       int maxval[5]
+         = { 255, 255, data->pwm[3][nr] ? : 255, 255, 255 };
        int err;
+       u8 reg;
 
        err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;
-       val = clamp_val(val, 0, 255);
+       val = clamp_val(val, minval[index], maxval[index]);
 
        mutex_lock(&data->update_lock);
        data->pwm[index][nr] = val;
        nct6775_write_value(data, data->REG_PWM[index][nr], val);
+       if (index == 2) { /* floor: disable if val == 0 */
+               reg = nct6775_read_value(data, data->REG_TEMP_SEL[nr]);
+               reg &= 0x7f;
+               if (val)
+                       reg |= 0x80;
+               nct6775_write_value(data, data->REG_TEMP_SEL[nr], reg);
+       }
        mutex_unlock(&data->update_lock);
        return count;
 }
 
+/* Returns 0 if OK, -EINVAL otherwise */
+static int check_trip_points(struct nct6775_data *data, int nr)
+{
+       int i;
+
+       for (i = 0; i < data->auto_pwm_num - 1; i++) {
+               if (data->auto_temp[nr][i] > data->auto_temp[nr][i + 1])
+                       return -EINVAL;
+       }
+       for (i = 0; i < data->auto_pwm_num - 1; i++) {
+               if (data->auto_pwm[nr][i] > data->auto_pwm[nr][i + 1])
+                       return -EINVAL;
+       }
+       /* validate critical temperature and pwm if enabled (pwm > 0) */
+       if (data->auto_pwm[nr][data->auto_pwm_num]) {
+               if (data->auto_temp[nr][data->auto_pwm_num - 1] >
+                               data->auto_temp[nr][data->auto_pwm_num] ||
+                   data->auto_pwm[nr][data->auto_pwm_num - 1] >
+                               data->auto_pwm[nr][data->auto_pwm_num])
+                       return -EINVAL;
+       }
+       return 0;
+}
+
+static void pwm_update_registers(struct nct6775_data *data, int nr)
+{
+       u8 reg;
+
+       switch (data->pwm_enable[nr]) {
+       case off:
+       case manual:
+               break;
+       case speed_cruise:
+               reg = nct6775_read_value(data, data->REG_FAN_MODE[nr]);
+               reg = (reg & ~data->tolerance_mask) |
+                 (data->target_speed_tolerance[nr] & data->tolerance_mask);
+               nct6775_write_value(data, data->REG_FAN_MODE[nr], reg);
+               nct6775_write_value(data, data->REG_TARGET[nr],
+                                   data->target_speed[nr] & 0xff);
+               if (data->REG_TOLERANCE_H) {
+                       reg = (data->target_speed[nr] >> 8) & 0x0f;
+                       reg |= (data->target_speed_tolerance[nr] & 0x38) << 1;
+                       nct6775_write_value(data,
+                                           data->REG_TOLERANCE_H[nr],
+                                           reg);
+               }
+               break;
+       case thermal_cruise:
+               nct6775_write_value(data, data->REG_TARGET[nr],
+                                   data->target_temp[nr]);
+               /* intentional */
+       default:
+               reg = nct6775_read_value(data, data->REG_FAN_MODE[nr]);
+               reg = (reg & ~data->tolerance_mask) |
+                 data->temp_tolerance[0][nr];
+               nct6775_write_value(data, data->REG_FAN_MODE[nr], reg);
+               break;
+       }
+}
+
 static ssize_t
 show_pwm_enable(struct device *dev, struct device_attribute *attr, char *buf)
 {
@@ -1798,6 +2053,12 @@ store_pwm_enable(struct device *dev, struct device_attribute *attr,
        if (val == sf3 && data->kind != nct6775)
                return -EINVAL;
 
+       if (val == sf4 && check_trip_points(data, nr)) {
+               dev_err(dev, "Inconsistent trip points, not switching to SmartFan IV mode\n");
+               dev_err(dev, "Adjust trip points and try again\n");
+               return -EINVAL;
+       }
+
        mutex_lock(&data->update_lock);
        data->pwm_enable[nr] = val;
        if (val == off) {
@@ -1807,6 +2068,7 @@ store_pwm_enable(struct device *dev, struct device_attribute *attr,
                data->pwm[0][nr] = 255;
                nct6775_write_value(data, data->REG_PWM[0][nr], 255);
        }
+       pwm_update_registers(data, nr);
        reg = nct6775_read_value(data, data->REG_FAN_MODE[nr]);
        reg &= 0x0f;
        reg |= pwm_enable_to_reg(val) << 4;
@@ -1815,6 +2077,235 @@ store_pwm_enable(struct device *dev, struct device_attribute *attr,
        return count;
 }
 
+static ssize_t
+show_pwm_temp_sel(struct device *dev, struct device_attribute *attr, char *buf)
+{
+       struct nct6775_data *data = nct6775_update_device(dev);
+       struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
+       int i, src, sel = 0;
+
+       src = data->pwm_temp_sel[sattr->index];
+
+       for (i = 0; i < NUM_TEMP; i++) {
+               if (!(data->have_temp & (1 << i)))
+                       continue;
+               if (src == data->temp_src[i]) {
+                       sel = i + 1;
+                       break;
+               }
+       }
+
+       return sprintf(buf, "%d\n", sel);
+}
+
+static ssize_t
+store_pwm_temp_sel(struct device *dev, struct device_attribute *attr,
+                  const char *buf, size_t count)
+{
+       struct nct6775_data *data = nct6775_update_device(dev);
+       struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
+       int nr = sattr->index;
+       unsigned long val;
+       int err, reg, src;
+
+       err = kstrtoul(buf, 10, &val);
+       if (err < 0)
+               return err;
+       if (val == 0 || val > NUM_TEMP)
+               return -EINVAL;
+       if (!(data->have_temp & (1 << (val - 1))) || !data->temp_src[val - 1])
+               return -EINVAL;
+
+       mutex_lock(&data->update_lock);
+       src = data->temp_src[val - 1];
+       data->pwm_temp_sel[nr] = src;
+       reg = nct6775_read_value(data, data->REG_TEMP_SEL[nr]);
+       reg &= 0xe0;
+       reg |= src;
+       nct6775_write_value(data, data->REG_TEMP_SEL[nr], reg);
+       mutex_unlock(&data->update_lock);
+
+       return count;
+}
+
+static ssize_t
+show_target_temp(struct device *dev, struct device_attribute *attr, char *buf)
+{
+       struct nct6775_data *data = nct6775_update_device(dev);
+       struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
+
+       return sprintf(buf, "%d\n", data->target_temp[sattr->index] * 1000);
+}
+
+static ssize_t
+store_target_temp(struct device *dev, struct device_attribute *attr,
+                 const char *buf, size_t count)
+{
+       struct nct6775_data *data = dev_get_drvdata(dev);
+       struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
+       int nr = sattr->index;
+       unsigned long val;
+       int err;
+
+       err = kstrtoul(buf, 10, &val);
+       if (err < 0)
+               return err;
+
+       val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0,
+                       data->target_temp_mask);
+
+       mutex_lock(&data->update_lock);
+       data->target_temp[nr] = val;
+       pwm_update_registers(data, nr);
+       mutex_unlock(&data->update_lock);
+       return count;
+}
+
+static ssize_t
+show_target_speed(struct device *dev, struct device_attribute *attr, char *buf)
+{
+       struct nct6775_data *data = nct6775_update_device(dev);
+       struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
+       int nr = sattr->index;
+
+       return sprintf(buf, "%d\n",
+                      fan_from_reg16(data->target_speed[nr],
+                                     data->fan_div[nr]));
+}
+
+static ssize_t
+store_target_speed(struct device *dev, struct device_attribute *attr,
+                  const char *buf, size_t count)
+{
+       struct nct6775_data *data = dev_get_drvdata(dev);
+       struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
+       int nr = sattr->index;
+       unsigned long val;
+       int err;
+       u16 speed;
+
+       err = kstrtoul(buf, 10, &val);
+       if (err < 0)
+               return err;
+
+       val = clamp_val(val, 0, 1350000U);
+       speed = fan_to_reg(val, data->fan_div[nr]);
+
+       mutex_lock(&data->update_lock);
+       data->target_speed[nr] = speed;
+       pwm_update_registers(data, nr);
+       mutex_unlock(&data->update_lock);
+       return count;
+}
+
+static ssize_t
+show_temp_tolerance(struct device *dev, struct device_attribute *attr,
+                   char *buf)
+{
+       struct nct6775_data *data = nct6775_update_device(dev);
+       struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+       int nr = sattr->nr;
+       int index = sattr->index;
+
+       return sprintf(buf, "%d\n", data->temp_tolerance[index][nr] * 1000);
+}
+
+static ssize_t
+store_temp_tolerance(struct device *dev, struct device_attribute *attr,
+                    const char *buf, size_t count)
+{
+       struct nct6775_data *data = dev_get_drvdata(dev);
+       struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+       int nr = sattr->nr;
+       int index = sattr->index;
+       unsigned long val;
+       int err;
+
+       err = kstrtoul(buf, 10, &val);
+       if (err < 0)
+               return err;
+
+       /* Limit tolerance as needed */
+       val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, data->tolerance_mask);
+
+       mutex_lock(&data->update_lock);
+       data->temp_tolerance[index][nr] = val;
+       if (index)
+               pwm_update_registers(data, nr);
+       else
+               nct6775_write_value(data,
+                                   data->REG_CRITICAL_TEMP_TOLERANCE[nr],
+                                   val);
+       mutex_unlock(&data->update_lock);
+       return count;
+}
+
+/*
+ * Fan speed tolerance is a tricky beast, since the associated register is
+ * a tick counter, but the value is reported and configured as rpm.
+ * Compute resulting low and high rpm values and report the difference.
+ */
+static ssize_t
+show_speed_tolerance(struct device *dev, struct device_attribute *attr,
+                    char *buf)
+{
+       struct nct6775_data *data = nct6775_update_device(dev);
+       struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
+       int nr = sattr->index;
+       int low = data->target_speed[nr] - data->target_speed_tolerance[nr];
+       int high = data->target_speed[nr] + data->target_speed_tolerance[nr];
+       int tolerance;
+
+       if (low <= 0)
+               low = 1;
+       if (high > 0xffff)
+               high = 0xffff;
+       if (high < low)
+               high = low;
+
+       tolerance = (fan_from_reg16(low, data->fan_div[nr])
+                    - fan_from_reg16(high, data->fan_div[nr])) / 2;
+
+       return sprintf(buf, "%d\n", tolerance);
+}
+
+static ssize_t
+store_speed_tolerance(struct device *dev, struct device_attribute *attr,
+                     const char *buf, size_t count)
+{
+       struct nct6775_data *data = dev_get_drvdata(dev);
+       struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
+       int nr = sattr->index;
+       unsigned long val;
+       int err;
+       int low, high;
+
+       err = kstrtoul(buf, 10, &val);
+       if (err < 0)
+               return err;
+
+       high = fan_from_reg16(data->target_speed[nr],
+                             data->fan_div[nr]) + val;
+       low = fan_from_reg16(data->target_speed[nr],
+                            data->fan_div[nr]) - val;
+       if (low <= 0)
+               low = 1;
+       if (high < low)
+               high = low;
+
+       val = (fan_to_reg(low, data->fan_div[nr]) -
+              fan_to_reg(high, data->fan_div[nr])) / 2;
+
+       /* Limit tolerance as needed */
+       val = clamp_val(val, 0, data->speed_tolerance_limit);
+
+       mutex_lock(&data->update_lock);
+       data->target_speed_tolerance[nr] = val;
+       pwm_update_registers(data, nr);
+       mutex_unlock(&data->update_lock);
+       return count;
+}
+
 static SENSOR_DEVICE_ATTR_2(pwm1, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0, 0);
 static SENSOR_DEVICE_ATTR_2(pwm2, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 1, 0);
 static SENSOR_DEVICE_ATTR_2(pwm3, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 2, 0);
@@ -1843,6 +2334,88 @@ static SENSOR_DEVICE_ATTR(pwm4_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
 static SENSOR_DEVICE_ATTR(pwm5_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
                          store_pwm_enable, 4);
 
+static SENSOR_DEVICE_ATTR(pwm1_temp_sel, S_IWUSR | S_IRUGO,
+                           show_pwm_temp_sel, store_pwm_temp_sel, 0);
+static SENSOR_DEVICE_ATTR(pwm2_temp_sel, S_IWUSR | S_IRUGO,
+                           show_pwm_temp_sel, store_pwm_temp_sel, 1);
+static SENSOR_DEVICE_ATTR(pwm3_temp_sel, S_IWUSR | S_IRUGO,
+                           show_pwm_temp_sel, store_pwm_temp_sel, 2);
+static SENSOR_DEVICE_ATTR(pwm4_temp_sel, S_IWUSR | S_IRUGO,
+                           show_pwm_temp_sel, store_pwm_temp_sel, 3);
+static SENSOR_DEVICE_ATTR(pwm5_temp_sel, S_IWUSR | S_IRUGO,
+                           show_pwm_temp_sel, store_pwm_temp_sel, 4);
+
+static SENSOR_DEVICE_ATTR(pwm1_target_temp, S_IWUSR | S_IRUGO, show_target_temp,
+                         store_target_temp, 0);
+static SENSOR_DEVICE_ATTR(pwm2_target_temp, S_IWUSR | S_IRUGO, show_target_temp,
+                         store_target_temp, 1);
+static SENSOR_DEVICE_ATTR(pwm3_target_temp, S_IWUSR | S_IRUGO, show_target_temp,
+                         store_target_temp, 2);
+static SENSOR_DEVICE_ATTR(pwm4_target_temp, S_IWUSR | S_IRUGO, show_target_temp,
+                         store_target_temp, 3);
+static SENSOR_DEVICE_ATTR(pwm5_target_temp, S_IWUSR | S_IRUGO, show_target_temp,
+                         store_target_temp, 4);
+
+static SENSOR_DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO, show_target_speed,
+                         store_target_speed, 0);
+static SENSOR_DEVICE_ATTR(fan2_target, S_IWUSR | S_IRUGO, show_target_speed,
+                         store_target_speed, 1);
+static SENSOR_DEVICE_ATTR(fan3_target, S_IWUSR | S_IRUGO, show_target_speed,
+                         store_target_speed, 2);
+static SENSOR_DEVICE_ATTR(fan4_target, S_IWUSR | S_IRUGO, show_target_speed,
+                         store_target_speed, 3);
+static SENSOR_DEVICE_ATTR(fan5_target, S_IWUSR | S_IRUGO, show_target_speed,
+                         store_target_speed, 4);
+
+static SENSOR_DEVICE_ATTR(fan1_tolerance, S_IWUSR | S_IRUGO,
+                           show_speed_tolerance, store_speed_tolerance, 0);
+static SENSOR_DEVICE_ATTR(fan2_tolerance, S_IWUSR | S_IRUGO,
+                           show_speed_tolerance, store_speed_tolerance, 1);
+static SENSOR_DEVICE_ATTR(fan3_tolerance, S_IWUSR | S_IRUGO,
+                           show_speed_tolerance, store_speed_tolerance, 2);
+static SENSOR_DEVICE_ATTR(fan4_tolerance, S_IWUSR | S_IRUGO,
+                           show_speed_tolerance, store_speed_tolerance, 3);
+static SENSOR_DEVICE_ATTR(fan5_tolerance, S_IWUSR | S_IRUGO,
+                           show_speed_tolerance, store_speed_tolerance, 4);
+
+/* Smart Fan registers */
+
+static ssize_t
+show_fan_time(struct device *dev, struct device_attribute *attr, char *buf)
+{
+       struct nct6775_data *data = nct6775_update_device(dev);
+       struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+       int nr = sattr->nr;
+       int index = sattr->index;
+
+       return sprintf(buf, "%d\n",
+                      step_time_from_reg(data->fan_time[index][nr],
+                                         data->pwm_mode[nr]));
+}
+
+static ssize_t
+store_fan_time(struct device *dev, struct device_attribute *attr,
+              const char *buf, size_t count)
+{
+       struct nct6775_data *data = dev_get_drvdata(dev);
+       struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+       int nr = sattr->nr;
+       int index = sattr->index;
+       unsigned long val;
+       int err;
+
+       err = kstrtoul(buf, 10, &val);
+       if (err < 0)
+               return err;
+
+       val = step_time_to_reg(val, data->pwm_mode[nr]);
+       mutex_lock(&data->update_lock);
+       data->fan_time[index][nr] = val;
+       nct6775_write_value(data, data->REG_FAN_TIME[index][nr], val);
+       mutex_unlock(&data->update_lock);
+       return count;
+}
+
 static ssize_t
 show_name(struct device *dev, struct device_attribute *attr, char *buf)
 {
@@ -1853,35 +2426,190 @@ show_name(struct device *dev, struct device_attribute *attr, char *buf)
 
 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 
-static struct attribute *nct6775_attributes_pwm[5][4] = {
+static SENSOR_DEVICE_ATTR_2(pwm1_stop_time, S_IWUSR | S_IRUGO, show_fan_time,
+                           store_fan_time, 0, 0);
+static SENSOR_DEVICE_ATTR_2(pwm2_stop_time, S_IWUSR | S_IRUGO, show_fan_time,
+                           store_fan_time, 1, 0);
+static SENSOR_DEVICE_ATTR_2(pwm3_stop_time, S_IWUSR | S_IRUGO, show_fan_time,
+                           store_fan_time, 2, 0);
+static SENSOR_DEVICE_ATTR_2(pwm4_stop_time, S_IWUSR | S_IRUGO, show_fan_time,
+                           store_fan_time, 3, 0);
+static SENSOR_DEVICE_ATTR_2(pwm5_stop_time, S_IWUSR | S_IRUGO, show_fan_time,
+                           store_fan_time, 4, 0);
+
+static SENSOR_DEVICE_ATTR_2(pwm1_step_up_time, S_IWUSR | S_IRUGO, show_fan_time,
+                           store_fan_time, 0, 1);
+static SENSOR_DEVICE_ATTR_2(pwm2_step_up_time, S_IWUSR | S_IRUGO, show_fan_time,
+                           store_fan_time, 1, 1);
+static SENSOR_DEVICE_ATTR_2(pwm3_step_up_time, S_IWUSR | S_IRUGO, show_fan_time,
+                           store_fan_time, 2, 1);
+static SENSOR_DEVICE_ATTR_2(pwm4_step_up_time, S_IWUSR | S_IRUGO, show_fan_time,
+                           store_fan_time, 3, 1);
+static SENSOR_DEVICE_ATTR_2(pwm5_step_up_time, S_IWUSR | S_IRUGO, show_fan_time,
+                           store_fan_time, 4, 1);
+
+static SENSOR_DEVICE_ATTR_2(pwm1_step_down_time, S_IWUSR | S_IRUGO,
+                           show_fan_time, store_fan_time, 0, 2);
+static SENSOR_DEVICE_ATTR_2(pwm2_step_down_time, S_IWUSR | S_IRUGO,
+                           show_fan_time, store_fan_time, 1, 2);
+static SENSOR_DEVICE_ATTR_2(pwm3_step_down_time, S_IWUSR | S_IRUGO,
+                           show_fan_time, store_fan_time, 2, 2);
+static SENSOR_DEVICE_ATTR_2(pwm4_step_down_time, S_IWUSR | S_IRUGO,
+                           show_fan_time, store_fan_time, 3, 2);
+static SENSOR_DEVICE_ATTR_2(pwm5_step_down_time, S_IWUSR | S_IRUGO,
+                           show_fan_time, store_fan_time, 4, 2);
+
+static SENSOR_DEVICE_ATTR_2(pwm1_start, S_IWUSR | S_IRUGO, show_pwm,
+                           store_pwm, 0, 1);
+static SENSOR_DEVICE_ATTR_2(pwm2_start, S_IWUSR | S_IRUGO, show_pwm,
+                           store_pwm, 1, 1);
+static SENSOR_DEVICE_ATTR_2(pwm3_start, S_IWUSR | S_IRUGO, show_pwm,
+                           store_pwm, 2, 1);
+static SENSOR_DEVICE_ATTR_2(pwm4_start, S_IWUSR | S_IRUGO, show_pwm,
+                           store_pwm, 3, 1);
+static SENSOR_DEVICE_ATTR_2(pwm5_start, S_IWUSR | S_IRUGO, show_pwm,
+                           store_pwm, 4, 1);
+
+static SENSOR_DEVICE_ATTR_2(pwm1_floor, S_IWUSR | S_IRUGO, show_pwm,
+                           store_pwm, 0, 2);
+static SENSOR_DEVICE_ATTR_2(pwm2_floor, S_IWUSR | S_IRUGO, show_pwm,
+                           store_pwm, 1, 2);
+static SENSOR_DEVICE_ATTR_2(pwm3_floor, S_IWUSR | S_IRUGO, show_pwm,
+                           store_pwm, 2, 2);
+static SENSOR_DEVICE_ATTR_2(pwm4_floor, S_IWUSR | S_IRUGO, show_pwm,
+                           store_pwm, 3, 2);
+static SENSOR_DEVICE_ATTR_2(pwm5_floor, S_IWUSR | S_IRUGO, show_pwm,
+                           store_pwm, 4, 2);
+
+static SENSOR_DEVICE_ATTR_2(pwm1_temp_tolerance, S_IWUSR | S_IRUGO,
+                           show_temp_tolerance, store_temp_tolerance, 0, 0);
+static SENSOR_DEVICE_ATTR_2(pwm2_temp_tolerance, S_IWUSR | S_IRUGO,
+                           show_temp_tolerance, store_temp_tolerance, 1, 0);
+static SENSOR_DEVICE_ATTR_2(pwm3_temp_tolerance, S_IWUSR | S_IRUGO,
+                           show_temp_tolerance, store_temp_tolerance, 2, 0);
+static SENSOR_DEVICE_ATTR_2(pwm4_temp_tolerance, S_IWUSR | S_IRUGO,
+                           show_temp_tolerance, store_temp_tolerance, 3, 0);
+static SENSOR_DEVICE_ATTR_2(pwm5_temp_tolerance, S_IWUSR | S_IRUGO,
+                           show_temp_tolerance, store_temp_tolerance, 4, 0);
+
+static SENSOR_DEVICE_ATTR_2(pwm1_crit_temp_tolerance, S_IWUSR | S_IRUGO,
+                           show_temp_tolerance, store_temp_tolerance, 0, 1);
+static SENSOR_DEVICE_ATTR_2(pwm2_crit_temp_tolerance, S_IWUSR | S_IRUGO,
+                           show_temp_tolerance, store_temp_tolerance, 1, 1);
+static SENSOR_DEVICE_ATTR_2(pwm3_crit_temp_tolerance, S_IWUSR | S_IRUGO,
+                           show_temp_tolerance, store_temp_tolerance, 2, 1);
+static SENSOR_DEVICE_ATTR_2(pwm4_crit_temp_tolerance, S_IWUSR | S_IRUGO,
+                           show_temp_tolerance, store_temp_tolerance, 3, 1);
+static SENSOR_DEVICE_ATTR_2(pwm5_crit_temp_tolerance, S_IWUSR | S_IRUGO,
+                           show_temp_tolerance, store_temp_tolerance, 4, 1);
+
+/* pwm_max is not supported on all chips */
+static struct sensor_device_attribute_2 sda_pwm_max[] = {
+       SENSOR_ATTR_2(pwm1_max, S_IWUSR | S_IRUGO, show_pwm, store_pwm,
+                     0, 3),
+       SENSOR_ATTR_2(pwm2_max, S_IWUSR | S_IRUGO, show_pwm, store_pwm,
+                     1, 3),
+       SENSOR_ATTR_2(pwm3_max, S_IWUSR | S_IRUGO, show_pwm, store_pwm,
+                     2, 3),
+       SENSOR_ATTR_2(pwm4_max, S_IWUSR | S_IRUGO, show_pwm, store_pwm,
+                     3, 3),
+       SENSOR_ATTR_2(pwm5_max, S_IWUSR | S_IRUGO, show_pwm, store_pwm,
+                     4, 3),
+};
+
+/* pwm_step is not supported on all chips */
+static struct sensor_device_attribute_2 sda_pwm_step[] = {
+       SENSOR_ATTR_2(pwm1_step, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0, 4),
+       SENSOR_ATTR_2(pwm2_step, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 1, 4),
+       SENSOR_ATTR_2(pwm3_step, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 2, 4),
+       SENSOR_ATTR_2(pwm4_step, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 3, 4),
+       SENSOR_ATTR_2(pwm5_step, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 4, 4),
+};
+
+static struct attribute *nct6775_attributes_pwm[5][15] = {
        {
                &sensor_dev_attr_pwm1.dev_attr.attr,
                &sensor_dev_attr_pwm1_mode.dev_attr.attr,
                &sensor_dev_attr_pwm1_enable.dev_attr.attr,
+               &sensor_dev_attr_pwm1_temp_sel.dev_attr.attr,
+               &sensor_dev_attr_pwm1_temp_tolerance.dev_attr.attr,
+               &sensor_dev_attr_pwm1_crit_temp_tolerance.dev_attr.attr,
+               &sensor_dev_attr_pwm1_target_temp.dev_attr.attr,
+               &sensor_dev_attr_fan1_target.dev_attr.attr,
+               &sensor_dev_attr_fan1_tolerance.dev_attr.attr,
+               &sensor_dev_attr_pwm1_stop_time.dev_attr.attr,
+               &sensor_dev_attr_pwm1_step_up_time.dev_attr.attr,
+               &sensor_dev_attr_pwm1_step_down_time.dev_attr.attr,
+               &sensor_dev_attr_pwm1_start.dev_attr.attr,
+               &sensor_dev_attr_pwm1_floor.dev_attr.attr,
                NULL
        },
        {
                &sensor_dev_attr_pwm2.dev_attr.attr,
                &sensor_dev_attr_pwm2_mode.dev_attr.attr,
                &sensor_dev_attr_pwm2_enable.dev_attr.attr,
+               &sensor_dev_attr_pwm2_temp_sel.dev_attr.attr,
+               &sensor_dev_attr_pwm2_temp_tolerance.dev_attr.attr,
+               &sensor_dev_attr_pwm2_crit_temp_tolerance.dev_attr.attr,
+               &sensor_dev_attr_pwm2_target_temp.dev_attr.attr,
+               &sensor_dev_attr_fan2_target.dev_attr.attr,
+               &sensor_dev_attr_fan2_tolerance.dev_attr.attr,
+               &sensor_dev_attr_pwm2_stop_time.dev_attr.attr,
+               &sensor_dev_attr_pwm2_step_up_time.dev_attr.attr,
+               &sensor_dev_attr_pwm2_step_down_time.dev_attr.attr,
+               &sensor_dev_attr_pwm2_start.dev_attr.attr,
+               &sensor_dev_attr_pwm2_floor.dev_attr.attr,
                NULL
        },
        {
                &sensor_dev_attr_pwm3.dev_attr.attr,
                &sensor_dev_attr_pwm3_mode.dev_attr.attr,
                &sensor_dev_attr_pwm3_enable.dev_attr.attr,
+               &sensor_dev_attr_pwm3_temp_sel.dev_attr.attr,
+               &sensor_dev_attr_pwm3_temp_tolerance.dev_attr.attr,
+               &sensor_dev_attr_pwm3_crit_temp_tolerance.dev_attr.attr,
+               &sensor_dev_attr_pwm3_target_temp.dev_attr.attr,
+               &sensor_dev_attr_fan3_target.dev_attr.attr,
+               &sensor_dev_attr_fan3_tolerance.dev_attr.attr,
+               &sensor_dev_attr_pwm3_stop_time.dev_attr.attr,
+               &sensor_dev_attr_pwm3_step_up_time.dev_attr.attr,
+               &sensor_dev_attr_pwm3_step_down_time.dev_attr.attr,
+               &sensor_dev_attr_pwm3_start.dev_attr.attr,
+               &sensor_dev_attr_pwm3_floor.dev_attr.attr,
                NULL
        },
        {
                &sensor_dev_attr_pwm4.dev_attr.attr,
                &sensor_dev_attr_pwm4_mode.dev_attr.attr,
                &sensor_dev_attr_pwm4_enable.dev_attr.attr,
+               &sensor_dev_attr_pwm4_temp_sel.dev_attr.attr,
+               &sensor_dev_attr_pwm4_temp_tolerance.dev_attr.attr,
+               &sensor_dev_attr_pwm4_crit_temp_tolerance.dev_attr.attr,
+               &sensor_dev_attr_pwm4_target_temp.dev_attr.attr,
+               &sensor_dev_attr_fan4_target.dev_attr.attr,
+               &sensor_dev_attr_fan4_tolerance.dev_attr.attr,
+               &sensor_dev_attr_pwm4_stop_time.dev_attr.attr,
+               &sensor_dev_attr_pwm4_step_up_time.dev_attr.attr,
+               &sensor_dev_attr_pwm4_step_down_time.dev_attr.attr,
+               &sensor_dev_attr_pwm4_start.dev_attr.attr,
+               &sensor_dev_attr_pwm4_floor.dev_attr.attr,
                NULL
        },
        {
                &sensor_dev_attr_pwm5.dev_attr.attr,
                &sensor_dev_attr_pwm5_mode.dev_attr.attr,
                &sensor_dev_attr_pwm5_enable.dev_attr.attr,
+               &sensor_dev_attr_pwm5_temp_sel.dev_attr.attr,
+               &sensor_dev_attr_pwm5_temp_tolerance.dev_attr.attr,
+               &sensor_dev_attr_pwm5_crit_temp_tolerance.dev_attr.attr,
+               &sensor_dev_attr_pwm5_target_temp.dev_attr.attr,
+               &sensor_dev_attr_fan5_target.dev_attr.attr,
+               &sensor_dev_attr_fan5_tolerance.dev_attr.attr,
+               &sensor_dev_attr_pwm5_stop_time.dev_attr.attr,
+               &sensor_dev_attr_pwm5_step_up_time.dev_attr.attr,
+               &sensor_dev_attr_pwm5_step_down_time.dev_attr.attr,
+               &sensor_dev_attr_pwm5_start.dev_attr.attr,
+               &sensor_dev_attr_pwm5_floor.dev_attr.attr,
                NULL
        },
 };
@@ -1895,6 +2623,277 @@ static const struct attribute_group nct6775_group_pwm[5] = {
 };
 
 static ssize_t
+show_auto_pwm(struct device *dev, struct device_attribute *attr, char *buf)
+{
+       struct nct6775_data *data = nct6775_update_device(dev);
+       struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+
+       return sprintf(buf, "%d\n", data->auto_pwm[sattr->nr][sattr->index]);
+}
+
+static ssize_t
+store_auto_pwm(struct device *dev, struct device_attribute *attr,
+              const char *buf, size_t count)
+{
+       struct nct6775_data *data = dev_get_drvdata(dev);
+       struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+       int nr = sattr->nr;
+       int point = sattr->index;
+       unsigned long val;
+       int err;
+       u8 reg;
+
+       err = kstrtoul(buf, 10, &val);
+       if (err < 0)
+               return err;
+       if (val > 255)
+               return -EINVAL;
+
+       if (point == data->auto_pwm_num) {
+               if (data->kind != nct6775 && !val)
+                       return -EINVAL;
+               if (data->kind != nct6779 && val)
+                       val = 0xff;
+       }
+
+       mutex_lock(&data->update_lock);
+       data->auto_pwm[nr][point] = val;
+       if (point < data->auto_pwm_num) {
+               nct6775_write_value(data,
+                                   NCT6775_AUTO_PWM(data, nr, point),
+                                   data->auto_pwm[nr][point]);
+       } else {
+               switch (data->kind) {
+               case nct6775:
+                       /* disable if needed (pwm == 0) */
+                       reg = nct6775_read_value(data,
+                                                NCT6775_REG_CRITICAL_ENAB[nr]);
+                       if (val)
+                               reg |= 0x02;
+                       else
+                               reg &= ~0x02;
+                       nct6775_write_value(data, NCT6775_REG_CRITICAL_ENAB[nr],
+                                           reg);
+                       break;
+               case nct6776:
+                       break; /* always enabled, nothing to do */
+               case nct6779:
+                       nct6775_write_value(data, NCT6779_REG_CRITICAL_PWM[nr],
+                                           val);
+                       reg = nct6775_read_value(data,
+                                       NCT6779_REG_CRITICAL_PWM_ENABLE[nr]);
+                       if (val == 255)
+                               reg &= ~0x01;
+                       else
+                               reg |= 0x01;
+                       nct6775_write_value(data,
+                                           NCT6779_REG_CRITICAL_PWM_ENABLE[nr],
+                                           reg);
+                       break;
+               }
+       }
+       mutex_unlock(&data->update_lock);
+       return count;
+}
+
+static ssize_t
+show_auto_temp(struct device *dev, struct device_attribute *attr, char *buf)
+{
+       struct nct6775_data *data = nct6775_update_device(dev);
+       struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+       int nr = sattr->nr;
+       int point = sattr->index;
+
+       /*
+        * We don't know for sure if the temperature is signed or unsigned.
+        * Assume it is unsigned.
+        */
+       return sprintf(buf, "%d\n", data->auto_temp[nr][point] * 1000);
+}
+
+static ssize_t
+store_auto_temp(struct device *dev, struct device_attribute *attr,
+               const char *buf, size_t count)
+{
+       struct nct6775_data *data = dev_get_drvdata(dev);
+       struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+       int nr = sattr->nr;
+       int point = sattr->index;
+       unsigned long val;
+       int err;
+
+       err = kstrtoul(buf, 10, &val);
+       if (err)
+               return err;
+       if (val > 255000)
+               return -EINVAL;
+
+       mutex_lock(&data->update_lock);
+       data->auto_temp[nr][point] = DIV_ROUND_CLOSEST(val, 1000);
+       if (point < data->auto_pwm_num) {
+               nct6775_write_value(data,
+                                   NCT6775_AUTO_TEMP(data, nr, point),
+                                   data->auto_temp[nr][point]);
+       } else {
+               nct6775_write_value(data, data->REG_CRITICAL_TEMP[nr],
+                                   data->auto_temp[nr][point]);
+       }
+       mutex_unlock(&data->update_lock);
+       return count;
+}
+
+/*
+ * The number of auto-point trip points is chip dependent.
+ * Need to check support while generating/removing attribute files.
+ */
+static struct sensor_device_attribute_2 sda_auto_pwm_arrays[] = {
+       SENSOR_ATTR_2(pwm1_auto_point1_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 0, 0),
+       SENSOR_ATTR_2(pwm1_auto_point1_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 0, 0),
+       SENSOR_ATTR_2(pwm1_auto_point2_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 0, 1),
+       SENSOR_ATTR_2(pwm1_auto_point2_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 0, 1),
+       SENSOR_ATTR_2(pwm1_auto_point3_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 0, 2),
+       SENSOR_ATTR_2(pwm1_auto_point3_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 0, 2),
+       SENSOR_ATTR_2(pwm1_auto_point4_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 0, 3),
+       SENSOR_ATTR_2(pwm1_auto_point4_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 0, 3),
+       SENSOR_ATTR_2(pwm1_auto_point5_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 0, 4),
+       SENSOR_ATTR_2(pwm1_auto_point5_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 0, 4),
+       SENSOR_ATTR_2(pwm1_auto_point6_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 0, 5),
+       SENSOR_ATTR_2(pwm1_auto_point6_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 0, 5),
+       SENSOR_ATTR_2(pwm1_auto_point7_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 0, 6),
+       SENSOR_ATTR_2(pwm1_auto_point7_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 0, 6),
+
+       SENSOR_ATTR_2(pwm2_auto_point1_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 1, 0),
+       SENSOR_ATTR_2(pwm2_auto_point1_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 1, 0),
+       SENSOR_ATTR_2(pwm2_auto_point2_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 1, 1),
+       SENSOR_ATTR_2(pwm2_auto_point2_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 1, 1),
+       SENSOR_ATTR_2(pwm2_auto_point3_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 1, 2),
+       SENSOR_ATTR_2(pwm2_auto_point3_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 1, 2),
+       SENSOR_ATTR_2(pwm2_auto_point4_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 1, 3),
+       SENSOR_ATTR_2(pwm2_auto_point4_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 1, 3),
+       SENSOR_ATTR_2(pwm2_auto_point5_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 1, 4),
+       SENSOR_ATTR_2(pwm2_auto_point5_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 1, 4),
+       SENSOR_ATTR_2(pwm2_auto_point6_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 1, 5),
+       SENSOR_ATTR_2(pwm2_auto_point6_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 1, 5),
+       SENSOR_ATTR_2(pwm2_auto_point7_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 1, 6),
+       SENSOR_ATTR_2(pwm2_auto_point7_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 1, 6),
+
+       SENSOR_ATTR_2(pwm3_auto_point1_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 2, 0),
+       SENSOR_ATTR_2(pwm3_auto_point1_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 2, 0),
+       SENSOR_ATTR_2(pwm3_auto_point2_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 2, 1),
+       SENSOR_ATTR_2(pwm3_auto_point2_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 2, 1),
+       SENSOR_ATTR_2(pwm3_auto_point3_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 2, 2),
+       SENSOR_ATTR_2(pwm3_auto_point3_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 2, 2),
+       SENSOR_ATTR_2(pwm3_auto_point4_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 2, 3),
+       SENSOR_ATTR_2(pwm3_auto_point4_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 2, 3),
+       SENSOR_ATTR_2(pwm3_auto_point5_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 2, 4),
+       SENSOR_ATTR_2(pwm3_auto_point5_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 2, 4),
+       SENSOR_ATTR_2(pwm3_auto_point6_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 2, 5),
+       SENSOR_ATTR_2(pwm3_auto_point6_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 2, 5),
+       SENSOR_ATTR_2(pwm3_auto_point7_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 2, 6),
+       SENSOR_ATTR_2(pwm3_auto_point7_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 2, 6),
+
+       SENSOR_ATTR_2(pwm4_auto_point1_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 3, 0),
+       SENSOR_ATTR_2(pwm4_auto_point1_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 3, 0),
+       SENSOR_ATTR_2(pwm4_auto_point2_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 3, 1),
+       SENSOR_ATTR_2(pwm4_auto_point2_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 3, 1),
+       SENSOR_ATTR_2(pwm4_auto_point3_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 3, 2),
+       SENSOR_ATTR_2(pwm4_auto_point3_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 3, 2),
+       SENSOR_ATTR_2(pwm4_auto_point4_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 3, 3),
+       SENSOR_ATTR_2(pwm4_auto_point4_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 3, 3),
+       SENSOR_ATTR_2(pwm4_auto_point5_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 3, 4),
+       SENSOR_ATTR_2(pwm4_auto_point5_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 3, 4),
+       SENSOR_ATTR_2(pwm4_auto_point6_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 3, 5),
+       SENSOR_ATTR_2(pwm4_auto_point6_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 3, 5),
+       SENSOR_ATTR_2(pwm4_auto_point7_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 3, 6),
+       SENSOR_ATTR_2(pwm4_auto_point7_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 3, 6),
+
+       SENSOR_ATTR_2(pwm5_auto_point1_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 4, 0),
+       SENSOR_ATTR_2(pwm5_auto_point1_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 4, 0),
+       SENSOR_ATTR_2(pwm5_auto_point2_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 4, 1),
+       SENSOR_ATTR_2(pwm5_auto_point2_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 4, 1),
+       SENSOR_ATTR_2(pwm5_auto_point3_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 4, 2),
+       SENSOR_ATTR_2(pwm5_auto_point3_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 4, 2),
+       SENSOR_ATTR_2(pwm5_auto_point4_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 4, 3),
+       SENSOR_ATTR_2(pwm5_auto_point4_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 4, 3),
+       SENSOR_ATTR_2(pwm5_auto_point5_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 4, 4),
+       SENSOR_ATTR_2(pwm5_auto_point5_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 4, 4),
+       SENSOR_ATTR_2(pwm5_auto_point6_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 4, 5),
+       SENSOR_ATTR_2(pwm5_auto_point6_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 4, 5),
+       SENSOR_ATTR_2(pwm5_auto_point7_pwm, S_IWUSR | S_IRUGO,
+                     show_auto_pwm, store_auto_pwm, 4, 6),
+       SENSOR_ATTR_2(pwm5_auto_point7_temp, S_IWUSR | S_IRUGO,
+                     show_auto_temp, store_auto_temp, 4, 6),
+};
+
+static ssize_t
 show_vid(struct device *dev, struct device_attribute *attr, char *buf)
 {
        struct nct6775_data *data = dev_get_drvdata(dev);
@@ -1969,6 +2968,15 @@ static void nct6775_device_remove_files(struct device *dev)
        for (i = 0; i < data->pwm_num; i++)
                sysfs_remove_group(&dev->kobj, &nct6775_group_pwm[i]);
 
+       for (i = 0; i < ARRAY_SIZE(sda_pwm_max); i++)
+               device_remove_file(dev, &sda_pwm_max[i].dev_attr);
+
+       for (i = 0; i < ARRAY_SIZE(sda_pwm_step); i++)
+               device_remove_file(dev, &sda_pwm_step[i].dev_attr);
+
+       for (i = 0; i < ARRAY_SIZE(sda_auto_pwm_arrays); i++)
+               device_remove_file(dev, &sda_auto_pwm_arrays[i].dev_attr);
+
        for (i = 0; i < data->in_num; i++)
                sysfs_remove_group(&dev->kobj, &nct6775_group_in[i]);
 
@@ -2161,6 +3169,7 @@ static int nct6775_probe(struct platform_device *pdev)
        case nct6775:
                data->in_num = 9;
                data->pwm_num = 3;
+               data->auto_pwm_num = 6;
                data->has_fan_div = true;
                data->temp_fixed_num = 3;
 
@@ -2168,6 +3177,9 @@ static int nct6775_probe(struct platform_device *pdev)
 
                data->fan_from_reg = fan_from_reg16;
                data->fan_from_reg_min = fan_from_reg8;
+               data->target_temp_mask = 0x7f;
+               data->tolerance_mask = 0x0f;
+               data->speed_tolerance_limit = 15;
 
                data->temp_label = nct6775_temp_label;
                data->temp_label_num = ARRAY_SIZE(nct6775_temp_label);
@@ -2178,16 +3190,30 @@ static int nct6775_probe(struct platform_device *pdev)
                data->REG_VIN = NCT6775_REG_IN;
                data->REG_IN_MINMAX[0] = NCT6775_REG_IN_MIN;
                data->REG_IN_MINMAX[1] = NCT6775_REG_IN_MAX;
+               data->REG_TARGET = NCT6775_REG_TARGET;
                data->REG_FAN = NCT6775_REG_FAN;
                data->REG_FAN_MODE = NCT6775_REG_FAN_MODE;
                data->REG_FAN_MIN = NCT6775_REG_FAN_MIN;
                data->REG_FAN_PULSES = NCT6775_REG_FAN_PULSES;
+               data->REG_FAN_TIME[0] = NCT6775_REG_FAN_STOP_TIME;
+               data->REG_FAN_TIME[1] = NCT6775_REG_FAN_STEP_UP_TIME;
+               data->REG_FAN_TIME[2] = NCT6775_REG_FAN_STEP_DOWN_TIME;
                data->REG_PWM[0] = NCT6775_REG_PWM;
+               data->REG_PWM[1] = NCT6775_REG_FAN_START_OUTPUT;
+               data->REG_PWM[2] = NCT6775_REG_FAN_STOP_OUTPUT;
+               data->REG_PWM[3] = NCT6775_REG_FAN_MAX_OUTPUT;
+               data->REG_PWM[4] = NCT6775_REG_FAN_STEP_OUTPUT;
                data->REG_PWM_READ = NCT6775_REG_PWM_READ;
                data->REG_PWM_MODE = NCT6775_REG_PWM_MODE;
                data->PWM_MODE_MASK = NCT6775_PWM_MODE_MASK;
+               data->REG_AUTO_TEMP = NCT6775_REG_AUTO_TEMP;
+               data->REG_AUTO_PWM = NCT6775_REG_AUTO_PWM;
+               data->REG_CRITICAL_TEMP = NCT6775_REG_CRITICAL_TEMP;
+               data->REG_CRITICAL_TEMP_TOLERANCE
+                 = NCT6775_REG_CRITICAL_TEMP_TOLERANCE;
                data->REG_TEMP_OFFSET = NCT6775_REG_TEMP_OFFSET;
                data->REG_TEMP_SOURCE = NCT6775_REG_TEMP_SOURCE;
+               data->REG_TEMP_SEL = NCT6775_REG_TEMP_SEL;
                data->REG_ALARM = NCT6775_REG_ALARM;
 
                reg_temp = NCT6775_REG_TEMP;
@@ -2202,6 +3228,7 @@ static int nct6775_probe(struct platform_device *pdev)
        case nct6776:
                data->in_num = 9;
                data->pwm_num = 3;
+               data->auto_pwm_num = 4;
                data->has_fan_div = false;
                data->temp_fixed_num = 3;
 
@@ -2209,6 +3236,9 @@ static int nct6775_probe(struct platform_device *pdev)
 
                data->fan_from_reg = fan_from_reg13;
                data->fan_from_reg_min = fan_from_reg13;
+               data->target_temp_mask = 0xff;
+               data->tolerance_mask = 0x07;
+               data->speed_tolerance_limit = 63;
 
                data->temp_label = nct6776_temp_label;
                data->temp_label_num = ARRAY_SIZE(nct6776_temp_label);
@@ -2219,16 +3249,29 @@ static int nct6775_probe(struct platform_device *pdev)
                data->REG_VIN = NCT6775_REG_IN;
                data->REG_IN_MINMAX[0] = NCT6775_REG_IN_MIN;
                data->REG_IN_MINMAX[1] = NCT6775_REG_IN_MAX;
+               data->REG_TARGET = NCT6775_REG_TARGET;
                data->REG_FAN = NCT6775_REG_FAN;
                data->REG_FAN_MODE = NCT6775_REG_FAN_MODE;
                data->REG_FAN_MIN = NCT6776_REG_FAN_MIN;
                data->REG_FAN_PULSES = NCT6776_REG_FAN_PULSES;
+               data->REG_FAN_TIME[0] = NCT6775_REG_FAN_STOP_TIME;
+               data->REG_FAN_TIME[1] = NCT6775_REG_FAN_STEP_UP_TIME;
+               data->REG_FAN_TIME[2] = NCT6775_REG_FAN_STEP_DOWN_TIME;
+               data->REG_TOLERANCE_H = NCT6776_REG_TOLERANCE_H;
                data->REG_PWM[0] = NCT6775_REG_PWM;
+               data->REG_PWM[1] = NCT6775_REG_FAN_START_OUTPUT;
+               data->REG_PWM[2] = NCT6775_REG_FAN_STOP_OUTPUT;
                data->REG_PWM_READ = NCT6775_REG_PWM_READ;
                data->REG_PWM_MODE = NCT6776_REG_PWM_MODE;
                data->PWM_MODE_MASK = NCT6776_PWM_MODE_MASK;
+               data->REG_AUTO_TEMP = NCT6775_REG_AUTO_TEMP;
+               data->REG_AUTO_PWM = NCT6775_REG_AUTO_PWM;
+               data->REG_CRITICAL_TEMP = NCT6775_REG_CRITICAL_TEMP;
+               data->REG_CRITICAL_TEMP_TOLERANCE
+                 = NCT6775_REG_CRITICAL_TEMP_TOLERANCE;
                data->REG_TEMP_OFFSET = NCT6775_REG_TEMP_OFFSET;
                data->REG_TEMP_SOURCE = NCT6775_REG_TEMP_SOURCE;
+               data->REG_TEMP_SEL = NCT6775_REG_TEMP_SEL;
                data->REG_ALARM = NCT6775_REG_ALARM;
 
                reg_temp = NCT6775_REG_TEMP;
@@ -2243,6 +3286,7 @@ static int nct6775_probe(struct platform_device *pdev)
        case nct6779:
                data->in_num = 15;
                data->pwm_num = 5;
+               data->auto_pwm_num = 4;
                data->has_fan_div = false;
                data->temp_fixed_num = 6;
 
@@ -2250,6 +3294,9 @@ static int nct6775_probe(struct platform_device *pdev)
 
                data->fan_from_reg = fan_from_reg13;
                data->fan_from_reg_min = fan_from_reg13;
+               data->target_temp_mask = 0xff;
+               data->tolerance_mask = 0x07;
+               data->speed_tolerance_limit = 63;
 
                data->temp_label = nct6779_temp_label;
                data->temp_label_num = ARRAY_SIZE(nct6779_temp_label);
@@ -2260,16 +3307,29 @@ static int nct6775_probe(struct platform_device *pdev)
                data->REG_VIN = NCT6779_REG_IN;
                data->REG_IN_MINMAX[0] = NCT6775_REG_IN_MIN;
                data->REG_IN_MINMAX[1] = NCT6775_REG_IN_MAX;
+               data->REG_TARGET = NCT6775_REG_TARGET;
                data->REG_FAN = NCT6779_REG_FAN;
                data->REG_FAN_MODE = NCT6775_REG_FAN_MODE;
                data->REG_FAN_MIN = NCT6776_REG_FAN_MIN;
                data->REG_FAN_PULSES = NCT6779_REG_FAN_PULSES;
+               data->REG_FAN_TIME[0] = NCT6775_REG_FAN_STOP_TIME;
+               data->REG_FAN_TIME[1] = NCT6775_REG_FAN_STEP_UP_TIME;
+               data->REG_FAN_TIME[2] = NCT6775_REG_FAN_STEP_DOWN_TIME;
+               data->REG_TOLERANCE_H = NCT6776_REG_TOLERANCE_H;
                data->REG_PWM[0] = NCT6775_REG_PWM;
+               data->REG_PWM[1] = NCT6775_REG_FAN_START_OUTPUT;
+               data->REG_PWM[2] = NCT6775_REG_FAN_STOP_OUTPUT;
                data->REG_PWM_READ = NCT6775_REG_PWM_READ;
                data->REG_PWM_MODE = NCT6776_REG_PWM_MODE;
                data->PWM_MODE_MASK = NCT6776_PWM_MODE_MASK;
+               data->REG_AUTO_TEMP = NCT6775_REG_AUTO_TEMP;
+               data->REG_AUTO_PWM = NCT6775_REG_AUTO_PWM;
+               data->REG_CRITICAL_TEMP = NCT6775_REG_CRITICAL_TEMP;
+               data->REG_CRITICAL_TEMP_TOLERANCE
+                 = NCT6775_REG_CRITICAL_TEMP_TOLERANCE;
                data->REG_TEMP_OFFSET = NCT6779_REG_TEMP_OFFSET;
                data->REG_TEMP_SOURCE = NCT6775_REG_TEMP_SOURCE;
+               data->REG_TEMP_SEL = NCT6775_REG_TEMP_SEL;
                data->REG_ALARM = NCT6779_REG_ALARM;
 
                reg_temp = NCT6779_REG_TEMP;
@@ -2484,6 +3544,31 @@ static int nct6775_probe(struct platform_device *pdev)
                err = sysfs_create_group(&dev->kobj, &nct6775_group_pwm[i]);
                if (err)
                        goto exit_remove;
+
+               if (data->REG_PWM[3]) {
+                       err = device_create_file(dev,
+                                       &sda_pwm_max[i].dev_attr);
+                       if (err)
+                               goto exit_remove;
+               }
+               if (data->REG_PWM[4]) {
+                       err = device_create_file(dev,
+                                       &sda_pwm_step[i].dev_attr);
+                       if (err)
+                               goto exit_remove;
+               }
+       }
+       for (i = 0; i < ARRAY_SIZE(sda_auto_pwm_arrays); i++) {
+               struct sensor_device_attribute_2 *attr =
+                       &sda_auto_pwm_arrays[i];
+
+               if (!(data->has_pwm & (1 << attr->nr)))
+                       continue;
+               if (attr->index > data->auto_pwm_num)
+                       continue;
+               err = device_create_file(dev, &attr->dev_attr);
+               if (err)
+                       goto exit_remove;
        }
 
        for (i = 0; i < data->in_num; i++) {
@@ -2518,7 +3603,7 @@ static int nct6775_probe(struct platform_device *pdev)
                                        goto exit_remove;
                        }
                        err = device_create_file(dev,
-                                                &sda_fan_pulses[i].dev_attr);
+                                               &sda_fan_pulses[i].dev_attr);
                        if (err)
                                goto exit_remove;
                }