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Date: Thu, 4 May 2017 01:28:17 +0000
From: Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To: Guenter Roeck <linux@...ck-us.net>
CC: "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
"jdelvare@...e.com" <jdelvare@...e.com>,
Jonathan Corbet <corbet@....net>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v2 3/3] hwmon: (adt7475) temperature smoothing
On 04/05/17 04:30, Guenter Roeck wrote:
> On Wed, May 03, 2017 at 12:40:09PM +1200, Chris Packham wrote:
>> When enabled temperature smoothing allows ramping the fan speed over a
>> configurable period of time instead of jumping to the new speed
>> instantaneously.
>>
>> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
>> ---
>> Changes in v2:
>> - use a single tempN_smoothing attribute
>>
>> Documentation/hwmon/adt7475 | 4 ++
>> drivers/hwmon/adt7475.c | 99 +++++++++++++++++++++++++++++++++++++++++++++
>> 2 files changed, 103 insertions(+)
>>
>> diff --git a/Documentation/hwmon/adt7475 b/Documentation/hwmon/adt7475
>> index 63507402cd4f..dd6433d819d0 100644
>> --- a/Documentation/hwmon/adt7475
>> +++ b/Documentation/hwmon/adt7475
>> @@ -114,6 +114,10 @@ minimum (i.e. auto_point1_pwm). This behaviour be configured using the
>> pwm[1-*]_stall_dis 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.
>>
>> +The responsiveness of the ADT747x to temperature changes can be configured.
>> +This allows smoothing of the fan speed transition. To set the transition time
>> +set the value in ms in the temp[1-*]_smoothing sysfs attribute.
>> +
>> Notes
>> -----
>>
>> diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c
>> index 85957324cd85..41342de6e20c 100644
>> --- a/drivers/hwmon/adt7475.c
>> +++ b/drivers/hwmon/adt7475.c
>> @@ -526,6 +526,96 @@ static ssize_t set_temp(struct device *dev, struct device_attribute *attr,
>> return count;
>> }
>>
>> +/* Assuming CONFIG6[SLOW] is 0 */
>
> Can you take that into account and calculate a "best fit" based on the
> available options ?
Do you mean check CONFIG6[SLOW] and choose between 1 of 2 possible maps?
Or have a unified map and choose both the SLOW and ACOU values?
I briefly considered the latter but things soon started to get
complicated. It would look something like this (please excuse using a
MUA as a code editor).
static const int ad7475_st_map[] = {
52200, 37500, 26100, 18800, 17400, 12500, 10400, 7500,
6500, 4700, 4400, 3100, 2200, 1600, 1100, 800,
};
i = find_closest_descending(val, ad7475_st_map,
ARRAY_SIZE(ad7475_st_map));
acou = i / 2;
slow = i % 2;
Going in reverse then gets really fun
slow = !!(i2c_smbus_read_byte_data(client, REG_CONFIG6) & BIT(PWMx))
acou = data->enh_acou[idx];
i = (acou * 2) + slow;
return sprintf(buf, "%d\n", ad7475_st_map[i]);
I could probably make the above work I just wasn't sure it was worth the
hassle. Only the higher ranges would really be noticeable to anyone.
>
>> +static const int ad7475_st_map[] = {
>> + 37500, 18800, 12500, 7500, 4700, 3100, 1600, 800,
>> +};
>> +
>> +static ssize_t show_temp_st(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);
>> + int shift, idx;
>> + long val;
>> +
>> + switch (sattr->index) {
>> + case 0:
>> + shift = 0;
>> + idx = 0;
>> + break;
>> + case 1:
>> + shift = 4;
>> + idx = 1;
>> + break;
>> + case 2:
>> + shift = 0;
>> + idx = 1;
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> +
>> + val = data->enh_acou[idx] >> shift;
>> + if (val & 0x8) {
>> + return sprintf(buf, "%d\n", ad7475_st_map[val & 0x7]);
>> + } else {
>> + return sprintf(buf, "0\n");
>> + }
>> +}
>> +
>> +static ssize_t set_temp_st(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);
>> + unsigned char reg;
>> + int shift, idx;
>> + ulong val;
>> +
>> + if (kstrtoul(buf, 10, &val))
>> + return -EINVAL;
>> +
>> + switch (sattr->index) {
>> + case 0:
>> + reg = REG_ENHANCE_ACOUSTICS1;
>> + shift = 0;
>> + idx = 0;
>> + break;
>> + case 1:
>> + reg = REG_ENHANCE_ACOUSTICS2;
>> + shift = 4;
>> + idx = 1;
>> + break;
>> + case 2:
>> + reg = REG_ENHANCE_ACOUSTICS2;
>> + shift = 0;
>> + idx = 1;
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> +
>> + if (val > 0) {
>> + val = find_closest_descending(val, ad7475_st_map,
>> + ARRAY_SIZE(ad7475_st_map));
>> + val |= 0x8;
>> + }
>> +
>> + mutex_lock(&data->lock);
>> +
>> + data->enh_acou[idx] &= ~(0xf << shift);
>> + data->enh_acou[idx] |= (val << shift);
>> +
>> + i2c_smbus_write_byte_data(client, reg, data->enh_acou[idx]);
>> +
>> + mutex_unlock(&data->lock);
>> +
>> + return count;
>> +}
>> +
>> /*
>> * Table of autorange values - the user will write the value in millidegrees,
>> * and we'll convert it
>> @@ -1008,6 +1098,8 @@ static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
>> THERM, 0);
>> static SENSOR_DEVICE_ATTR_2(temp1_crit_hyst, S_IRUGO | S_IWUSR, show_temp,
>> set_temp, HYSTERSIS, 0);
>> +static SENSOR_DEVICE_ATTR_2(temp1_smoothing, S_IRUGO | S_IWUSR, show_temp_st,
>> + set_temp_st, 0, 0);
>> static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, INPUT, 1);
>> static SENSOR_DEVICE_ATTR_2(temp2_alarm, S_IRUGO, show_temp, NULL, ALARM, 1);
>> static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
>> @@ -1024,6 +1116,8 @@ static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
>> THERM, 1);
>> static SENSOR_DEVICE_ATTR_2(temp2_crit_hyst, S_IRUGO | S_IWUSR, show_temp,
>> set_temp, HYSTERSIS, 1);
>> +static SENSOR_DEVICE_ATTR_2(temp2_smoothing, S_IRUGO | S_IWUSR, show_temp_st,
>> + set_temp_st, 0, 1);
>> static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, INPUT, 2);
>> static SENSOR_DEVICE_ATTR_2(temp3_alarm, S_IRUGO, show_temp, NULL, ALARM, 2);
>> static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_temp, NULL, FAULT, 2);
>> @@ -1041,6 +1135,8 @@ static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
>> THERM, 2);
>> static SENSOR_DEVICE_ATTR_2(temp3_crit_hyst, S_IRUGO | S_IWUSR, show_temp,
>> set_temp, HYSTERSIS, 2);
>> +static SENSOR_DEVICE_ATTR_2(temp3_smoothing, S_IRUGO | S_IWUSR, show_temp_st,
>> + set_temp_st, 0, 2);
>> static SENSOR_DEVICE_ATTR_2(fan1_input, S_IRUGO, show_tach, NULL, INPUT, 0);
>> static SENSOR_DEVICE_ATTR_2(fan1_min, S_IRUGO | S_IWUSR, show_tach, set_tach,
>> MIN, 0);
>> @@ -1125,6 +1221,7 @@ static struct attribute *adt7475_attrs[] = {
>> &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
>> &sensor_dev_attr_temp1_crit.dev_attr.attr,
>> &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
>> + &sensor_dev_attr_temp1_smoothing.dev_attr.attr,
>> &sensor_dev_attr_temp2_input.dev_attr.attr,
>> &sensor_dev_attr_temp2_alarm.dev_attr.attr,
>> &sensor_dev_attr_temp2_max.dev_attr.attr,
>> @@ -1134,6 +1231,7 @@ static struct attribute *adt7475_attrs[] = {
>> &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
>> &sensor_dev_attr_temp2_crit.dev_attr.attr,
>> &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
>> + &sensor_dev_attr_temp2_smoothing.dev_attr.attr,
>> &sensor_dev_attr_temp3_input.dev_attr.attr,
>> &sensor_dev_attr_temp3_fault.dev_attr.attr,
>> &sensor_dev_attr_temp3_alarm.dev_attr.attr,
>> @@ -1144,6 +1242,7 @@ static struct attribute *adt7475_attrs[] = {
>> &sensor_dev_attr_temp3_auto_point2_temp.dev_attr.attr,
>> &sensor_dev_attr_temp3_crit.dev_attr.attr,
>> &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
>> + &sensor_dev_attr_temp3_smoothing.dev_attr.attr,
>> &sensor_dev_attr_fan1_input.dev_attr.attr,
>> &sensor_dev_attr_fan1_min.dev_attr.attr,
>> &sensor_dev_attr_fan1_alarm.dev_attr.attr,
>> --
>> 2.11.0.24.ge6920cf
>>
>
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