| Message ID | 20170502054536.21147-3-chris.packham@alliedtelesis.co.nz (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
On Tue, May 02, 2017 at 05:45:35PM +1200, Chris Packham wrote: > By default adt7475 will stop the fans (pwm duty cycle 0%) when the > temperature drops past Tmin - hysteresis. Some systems want to keep the > fans moving even when the temperature drops so add new sysfs attributes > that configure the enhanced acoustics min 1-3 which allows the fans to > run at the minimum configure pwm duty cycle. > > Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz> > --- > pwmN_min is a horrible name but I really can't think of anything better. > I'm biased a little because that is essentially the name of the bits in > the datasheet. I'm open to suggestions. pwmX_min is also traditionally the mimimum permitted pwm value, not a boolean. This would be more appropriate to reflect the PWMmin register values (0x64 to 0x66). Similar for pwmX_max if you want to add support for it. It might make sense to combine pwmX_min==0 with clearing the respective bit in the REG_ENHANCE_ACOUSTICS[12] register. This way we would only need one attribute to support both. Guenter > > Documentation/hwmon/adt7475 | 5 +++++ > drivers/hwmon/adt7475.c | 50 +++++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 55 insertions(+) > > diff --git a/Documentation/hwmon/adt7475 b/Documentation/hwmon/adt7475 > index 0502f2b464e1..85dc9e17bdee 100644 > --- a/Documentation/hwmon/adt7475 > +++ b/Documentation/hwmon/adt7475 > @@ -109,6 +109,11 @@ fan speed) is applied. PWM values range from 0 (off) to 255 (full speed). > Fan speed may be set to maximum when the temperature sensor associated with > the PWM control exceeds temp#_max. > > +At Tmin - hysteresis the PWM output can either be off (0% duty cycle) or > +at the minimum (i.e. auto_point1_pwm). This can be configured using the > +pwm[1-*]_min sysfs attribute. A value of 0 means the fans will shut off. A > +value of 1 means the fans will run at auto_point1_pwm. > + > Notes > ----- > > diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c > index ec0c43fbcdce..53f25bda0919 100644 > --- a/drivers/hwmon/adt7475.c > +++ b/drivers/hwmon/adt7475.c > @@ -79,6 +79,9 @@ > > #define REG_TEMP_TRANGE_BASE 0x5F > > +#define REG_ENHANCE_ACOUSTICS1 0x62 > +#define REG_ENHANCE_ACOUSTICS2 0x63 > + > #define REG_PWM_MIN_BASE 0x64 > > #define REG_TEMP_TMIN_BASE 0x67 > @@ -209,6 +212,7 @@ struct adt7475_data { > u8 range[3]; > u8 pwmctl[3]; > u8 pwmchan[3]; > + u8 enh_acou[2]; > > u8 vid; > u8 vrm; > @@ -700,6 +704,43 @@ static ssize_t set_pwm(struct device *dev, struct device_attribute *attr, > data->pwm[sattr->nr][sattr->index] = clamp_val(val, 0, 0xFF); > i2c_smbus_write_byte_data(client, reg, > data->pwm[sattr->nr][sattr->index]); > + mutex_unlock(&data->lock); > + > + return count; > +} > + > + > +static ssize_t show_pwm_min(struct device *dev, struct device_attribute *attr, > + char *buf) > +{ > + struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); > + struct i2c_client *client = to_i2c_client(dev); > + struct adt7475_data *data = i2c_get_clientdata(client); > + u8 mask = BIT(5 + sattr->index); > + > + return sprintf(buf, "%d\n", !!(data->enh_acou[0] & mask)); > +} > + > +static ssize_t set_pwm_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 i2c_client *client = to_i2c_client(dev); > + struct adt7475_data *data = i2c_get_clientdata(client); > + long val; > + u8 mask = BIT(5 + sattr->index); > + > + if (kstrtol(buf, 10, &val)) > + return -EINVAL; > + > + mutex_lock(&data->lock); > + > + data->enh_acou[0] &= ~mask; > + if (val) > + data->enh_acou[0] |= mask; > + > + i2c_smbus_write_byte_data(client, REG_ENHANCE_ACOUSTICS1, > + data->enh_acou[0]); > > mutex_unlock(&data->lock); > > @@ -1028,6 +1069,8 @@ static SENSOR_DEVICE_ATTR_2(pwm1_auto_point1_pwm, S_IRUGO | S_IWUSR, show_pwm, > set_pwm, MIN, 0); > static SENSOR_DEVICE_ATTR_2(pwm1_auto_point2_pwm, S_IRUGO | S_IWUSR, show_pwm, > set_pwm, MAX, 0); > +static SENSOR_DEVICE_ATTR_2(pwm1_min, S_IRUGO | S_IWUSR, show_pwm_min, > + set_pwm_min, 0, 0); > static SENSOR_DEVICE_ATTR_2(pwm2, S_IRUGO | S_IWUSR, show_pwm, set_pwm, INPUT, > 1); > static SENSOR_DEVICE_ATTR_2(pwm2_freq, S_IRUGO | S_IWUSR, show_pwmfreq, > @@ -1040,6 +1083,8 @@ static SENSOR_DEVICE_ATTR_2(pwm2_auto_point1_pwm, S_IRUGO | S_IWUSR, show_pwm, > set_pwm, MIN, 1); > static SENSOR_DEVICE_ATTR_2(pwm2_auto_point2_pwm, S_IRUGO | S_IWUSR, show_pwm, > set_pwm, MAX, 1); > +static SENSOR_DEVICE_ATTR_2(pwm2_min, S_IRUGO | S_IWUSR, show_pwm_min, > + set_pwm_min, 0, 1); > static SENSOR_DEVICE_ATTR_2(pwm3, S_IRUGO | S_IWUSR, show_pwm, set_pwm, INPUT, > 2); > static SENSOR_DEVICE_ATTR_2(pwm3_freq, S_IRUGO | S_IWUSR, show_pwmfreq, > @@ -1052,6 +1097,8 @@ static SENSOR_DEVICE_ATTR_2(pwm3_auto_point1_pwm, S_IRUGO | S_IWUSR, show_pwm, > set_pwm, MIN, 2); > static SENSOR_DEVICE_ATTR_2(pwm3_auto_point2_pwm, S_IRUGO | S_IWUSR, show_pwm, > set_pwm, MAX, 2); > +static SENSOR_DEVICE_ATTR_2(pwm3_min, S_IRUGO | S_IWUSR, show_pwm_min, > + set_pwm_min, 0, 2); > > /* Non-standard name, might need revisiting */ > static DEVICE_ATTR_RW(pwm_use_point2_pwm_at_crit); > @@ -1112,12 +1159,14 @@ static struct attribute *adt7475_attrs[] = { > &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr, > &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr, > &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr, > + &sensor_dev_attr_pwm1_min.dev_attr.attr, > &sensor_dev_attr_pwm3.dev_attr.attr, > &sensor_dev_attr_pwm3_freq.dev_attr.attr, > &sensor_dev_attr_pwm3_enable.dev_attr.attr, > &sensor_dev_attr_pwm3_auto_channels_temp.dev_attr.attr, > &sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr, > &sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr, > + &sensor_dev_attr_pwm3_min.dev_attr.attr, > &dev_attr_pwm_use_point2_pwm_at_crit.attr, > NULL, > }; > @@ -1136,6 +1185,7 @@ static struct attribute *pwm2_attrs[] = { > &sensor_dev_attr_pwm2_auto_channels_temp.dev_attr.attr, > &sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr, > &sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr, > + &sensor_dev_attr_pwm2_min.dev_attr.attr, > NULL > }; > > -- > 2.11.0.24.ge6920cf > > -- > To unsubscribe from this list: send the line "unsubscribe linux-hwmon" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-hwmon" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 03/05/17 06:07, Guenter Roeck wrote: > On Tue, May 02, 2017 at 05:45:35PM +1200, Chris Packham wrote: >> By default adt7475 will stop the fans (pwm duty cycle 0%) when the >> temperature drops past Tmin - hysteresis. Some systems want to keep the >> fans moving even when the temperature drops so add new sysfs attributes >> that configure the enhanced acoustics min 1-3 which allows the fans to >> run at the minimum configure pwm duty cycle. >> >> Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz> >> --- >> pwmN_min is a horrible name but I really can't think of anything better. >> I'm biased a little because that is essentially the name of the bits in >> the datasheet. I'm open to suggestions. > > pwmX_min is also traditionally the mimimum permitted pwm value, > not a boolean. This would be more appropriate to reflect the PWMmin > register values (0x64 to 0x66). Similar for pwmX_max if you want to > add support for it. For the adt7476 driver these are used as pwmN_auto_point[12]_pwm. > It might make sense to combine pwmX_min==0 with clearing the > respective bit in the REG_ENHANCE_ACOUSTICS[12] register. This way > we would only need one attribute to support both. I could add code such that if pwmN_auto_point1_pwm > 0. The bit in REG_ENHANCE_ACOUSTICS is set but that would be a change in existing behaviour. -- To unsubscribe from this list: send the line "unsubscribe linux-hwmon" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/hwmon/adt7475 b/Documentation/hwmon/adt7475 index 0502f2b464e1..85dc9e17bdee 100644 --- a/Documentation/hwmon/adt7475 +++ b/Documentation/hwmon/adt7475 @@ -109,6 +109,11 @@ fan speed) is applied. PWM values range from 0 (off) to 255 (full speed). Fan speed may be set to maximum when the temperature sensor associated with the PWM control exceeds temp#_max. +At Tmin - hysteresis the PWM output can either be off (0% duty cycle) or +at the minimum (i.e. auto_point1_pwm). This can be configured using the +pwm[1-*]_min sysfs attribute. A value of 0 means the fans will shut off. A +value of 1 means the fans will run at auto_point1_pwm. + Notes ----- diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c index ec0c43fbcdce..53f25bda0919 100644 --- a/drivers/hwmon/adt7475.c +++ b/drivers/hwmon/adt7475.c @@ -79,6 +79,9 @@ #define REG_TEMP_TRANGE_BASE 0x5F +#define REG_ENHANCE_ACOUSTICS1 0x62 +#define REG_ENHANCE_ACOUSTICS2 0x63 + #define REG_PWM_MIN_BASE 0x64 #define REG_TEMP_TMIN_BASE 0x67 @@ -209,6 +212,7 @@ struct adt7475_data { u8 range[3]; u8 pwmctl[3]; u8 pwmchan[3]; + u8 enh_acou[2]; u8 vid; u8 vrm; @@ -700,6 +704,43 @@ static ssize_t set_pwm(struct device *dev, struct device_attribute *attr, data->pwm[sattr->nr][sattr->index] = clamp_val(val, 0, 0xFF); i2c_smbus_write_byte_data(client, reg, data->pwm[sattr->nr][sattr->index]); + mutex_unlock(&data->lock); + + return count; +} + + +static ssize_t show_pwm_min(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); + struct i2c_client *client = to_i2c_client(dev); + struct adt7475_data *data = i2c_get_clientdata(client); + u8 mask = BIT(5 + sattr->index); + + return sprintf(buf, "%d\n", !!(data->enh_acou[0] & mask)); +} + +static ssize_t set_pwm_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 i2c_client *client = to_i2c_client(dev); + struct adt7475_data *data = i2c_get_clientdata(client); + long val; + u8 mask = BIT(5 + sattr->index); + + if (kstrtol(buf, 10, &val)) + return -EINVAL; + + mutex_lock(&data->lock); + + data->enh_acou[0] &= ~mask; + if (val) + data->enh_acou[0] |= mask; + + i2c_smbus_write_byte_data(client, REG_ENHANCE_ACOUSTICS1, + data->enh_acou[0]); mutex_unlock(&data->lock); @@ -1028,6 +1069,8 @@ static SENSOR_DEVICE_ATTR_2(pwm1_auto_point1_pwm, S_IRUGO | S_IWUSR, show_pwm, set_pwm, MIN, 0); static SENSOR_DEVICE_ATTR_2(pwm1_auto_point2_pwm, S_IRUGO | S_IWUSR, show_pwm, set_pwm, MAX, 0); +static SENSOR_DEVICE_ATTR_2(pwm1_min, S_IRUGO | S_IWUSR, show_pwm_min, + set_pwm_min, 0, 0); static SENSOR_DEVICE_ATTR_2(pwm2, S_IRUGO | S_IWUSR, show_pwm, set_pwm, INPUT, 1); static SENSOR_DEVICE_ATTR_2(pwm2_freq, S_IRUGO | S_IWUSR, show_pwmfreq, @@ -1040,6 +1083,8 @@ static SENSOR_DEVICE_ATTR_2(pwm2_auto_point1_pwm, S_IRUGO | S_IWUSR, show_pwm, set_pwm, MIN, 1); static SENSOR_DEVICE_ATTR_2(pwm2_auto_point2_pwm, S_IRUGO | S_IWUSR, show_pwm, set_pwm, MAX, 1); +static SENSOR_DEVICE_ATTR_2(pwm2_min, S_IRUGO | S_IWUSR, show_pwm_min, + set_pwm_min, 0, 1); static SENSOR_DEVICE_ATTR_2(pwm3, S_IRUGO | S_IWUSR, show_pwm, set_pwm, INPUT, 2); static SENSOR_DEVICE_ATTR_2(pwm3_freq, S_IRUGO | S_IWUSR, show_pwmfreq, @@ -1052,6 +1097,8 @@ static SENSOR_DEVICE_ATTR_2(pwm3_auto_point1_pwm, S_IRUGO | S_IWUSR, show_pwm, set_pwm, MIN, 2); static SENSOR_DEVICE_ATTR_2(pwm3_auto_point2_pwm, S_IRUGO | S_IWUSR, show_pwm, set_pwm, MAX, 2); +static SENSOR_DEVICE_ATTR_2(pwm3_min, S_IRUGO | S_IWUSR, show_pwm_min, + set_pwm_min, 0, 2); /* Non-standard name, might need revisiting */ static DEVICE_ATTR_RW(pwm_use_point2_pwm_at_crit); @@ -1112,12 +1159,14 @@ static struct attribute *adt7475_attrs[] = { &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr, &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr, &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr, + &sensor_dev_attr_pwm1_min.dev_attr.attr, &sensor_dev_attr_pwm3.dev_attr.attr, &sensor_dev_attr_pwm3_freq.dev_attr.attr, &sensor_dev_attr_pwm3_enable.dev_attr.attr, &sensor_dev_attr_pwm3_auto_channels_temp.dev_attr.attr, &sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr, &sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr, + &sensor_dev_attr_pwm3_min.dev_attr.attr, &dev_attr_pwm_use_point2_pwm_at_crit.attr, NULL, }; @@ -1136,6 +1185,7 @@ static struct attribute *pwm2_attrs[] = { &sensor_dev_attr_pwm2_auto_channels_temp.dev_attr.attr, &sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr, &sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr, + &sensor_dev_attr_pwm2_min.dev_attr.attr, NULL };
By default adt7475 will stop the fans (pwm duty cycle 0%) when the temperature drops past Tmin - hysteresis. Some systems want to keep the fans moving even when the temperature drops so add new sysfs attributes that configure the enhanced acoustics min 1-3 which allows the fans to run at the minimum configure pwm duty cycle. Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz> --- pwmN_min is a horrible name but I really can't think of anything better. I'm biased a little because that is essentially the name of the bits in the datasheet. I'm open to suggestions. Documentation/hwmon/adt7475 | 5 +++++ drivers/hwmon/adt7475.c | 50 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 55 insertions(+)