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Date: Fri, 22 Dec 2017 10:10:28 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Aishwarya Pant <aishpant@...il.com>
Cc: Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
linux-kernel@...r.kernel.org,
David Frey <david.frey@...sirion.com>,
Pascal Sachs <pascal.sachs@...sirion.com>, julia.lawall@...6.fr
Subject: Re: [PATCH] hwmon: (sht3x) move sysfs documentation to
Documentation/ABI
On Fri, Dec 22, 2017 at 10:56:04PM +0530, Aishwarya Pant wrote:
> The sysfs documentation for sht3x devices should be with the rest of the
> interfaces in Documentation/ABI. The motivation behind this is that
> documentation should be where the user expects it to be, rather than
> where the developer expects it to be.
>
> ABI documentation requires a specific format and this is how the
> information in it was filled-
>
> What: sht3x is an i2c device so it would be connected to the
> i2c bus
> Date: from the commit date that introduced the attribute
> KernelVersion: from the first stable version git tag that contains the
> commit
> Contact: module author(s)
> Description: from Documentation/hwmon/sht3x
>
> Signed-off-by: Aishwarya Pant <aishpant@...il.com>
Nack - I don't want to have to deal with two sets of locations
for hwmon documentations, and the ABI documentation is terrible
when it comes to documenting a driver with a generic ABI (and
I really do not want to have to maintain all those entries below).
Last but not least, the locations below are wrong: the official
location for hwmon device attributes is /sys/class/hwmon/...;
anything else is arbitrary and _not_ part of the hwmon sysfs ABI.
Guenter
> ---
>
> There are things that might be wrong here and I am unsure of-
> 1. Whether this file should be in stable or testing?
> 2. Contact information, full sysfs path etc
>
> I am doing this is in an exercise to move sysfs documentation to its right
> place and identify places where it might be missing. hwmon drivers seem to have
> a quite nice documentation, but just not in the ABI format.
>
Mostly for historic reasons.
> Documentation/ABI/stable/sysfs-bus-i2c-hwmon-sht3x | 128 +++++++++++++++++++++
> Documentation/hwmon/sht3x | 25 ----
> 2 files changed, 128 insertions(+), 25 deletions(-)
> create mode 100644 Documentation/ABI/stable/sysfs-bus-i2c-hwmon-sht3x
>
> diff --git a/Documentation/ABI/stable/sysfs-bus-i2c-hwmon-sht3x b/Documentation/ABI/stable/sysfs-bus-i2c-hwmon-sht3x
> new file mode 100644
> index 000000000000..0e8355c625f5
> --- /dev/null
> +++ b/Documentation/ABI/stable/sysfs-bus-i2c-hwmon-sht3x
> @@ -0,0 +1,128 @@
> +What: /sys/bus/i2c/devices/.../temp1_input
> +Date: June 2016
> +KernelVersion: 4.8
> +Contact: David Frey <david.frey@...sirion.com>,
> + Pascal Sachs <pascal.sachs@...sirion.com>
> +Description: (RO) Temperature input value
> + Unit: millidegree Celsius
> +
> +What: /sys/bus/i2c/devices/.../temp1_max
> +Date: June 2016
> +KernelVersion: 4.8
> +Contact: David Frey <david.frey@...sirion.com>,
> + Pascal Sachs <pascal.sachs@...sirion.com>
> +Description: (RW) Temperature max value.
> + Unit: millidegree Celsius
> +
> +What: /sys/bus/i2c/devices/.../temp1_max_hyst
> +Date: June 2016
> +KernelVersion: 4.8
> +Contact: David Frey <david.frey@...sirion.com>,
> + Pascal Sachs <pascal.sachs@...sirion.com>
> +Description: (RW) Temperature hysteresis value for max limit
> + Unit: millidegree Celsius
> +
> +What: /sys/bus/i2c/devices/.../temp1_min
> +Date: June 2016
> +KernelVersion: 4.8
> +Contact: David Frey <david.frey@...sirion.com>,
> + Pascal Sachs <pascal.sachs@...sirion.com>
> +Description: (RW) Temperature min value
> + Unit: millidegree Celsius
> +
> +What: /sys/bus/i2c/devices/.../temp1_min_hyst
> +Date: June 2016
> +KernelVersion: 4.8
> +Contact: David Frey <david.frey@...sirion.com>,
> + Pascal Sachs <pascal.sachs@...sirion.com>
> +Description: (RW) Temperature hysteresis value for min limit.
> + Unit: millidegree Celsius
> +
> +What: /sys/bus/i2c/devices/.../temp1_alarm
> +Date: June 2016
> +KernelVersion: 4.8
> +Contact: David Frey <david.frey@...sirion.com>,
> + Pascal Sachs <pascal.sachs@...sirion.com>
> +Description: (RO) Channel alarm
> + 0: no alarm
> + 1: alarm is set when the temperature is outside the configured
> + limits.
> + Only works in periodic measure mode
> +
> +What: /sys/bus/i2c/devices/.../humidity1_input
> +Date: June 2016
> +KernelVersion: 4.8
> +Contact: David Frey <david.frey@...sirion.com>,
> + Pascal Sachs <pascal.sachs@...sirion.com>
> +Description: (RO) humidity input
> + Unit: milli-percent
> +
> +What: /sys/bus/i2c/devices/.../humidity1_max
> +Date: June 2016
> +KernelVersion: 4.8
> +Contact: David Frey <david.frey@...sirion.com>,
> + Pascal Sachs <pascal.sachs@...sirion.com>
> +Description: (RW) humidity max value
> + Unit: milli-percent
> +
> +What: /sys/bus/i2c/devices/.../humidity1_max_hyst
> +Date: June 2016
> +KernelVersion: 4.8
> +Contact: David Frey <david.frey@...sirion.com>,
> + Pascal Sachs <pascal.sachs@...sirion.com>
> +Description: (RW) humidity hysteresis value for max limit
> + Unit: milli-percent
> +
> +What: /sys/bus/i2c/devices/.../humidity1_min
> +Date: June 2016
> +KernelVersion: 4.8
> +Contact: David Frey <david.frey@...sirion.com>,
> + Pascal Sachs <pascal.sachs@...sirion.com>
> +Description: (RW) humidity min value
> + Unit: milli-percent
> +
> +What: /sys/bus/i2c/devices/.../humidity1_min_hyst
> +Date: June 2016
> +KernelVersion: 4.8
> +Contact: David Frey <david.frey@...sirion.com>,
> + Pascal Sachs <pascal.sachs@...sirion.com>
> +Description: (RW) humidity hysteresis value for min limit
> + Unit: milli-percent
> +
> +What: /sys/bus/i2c/devices/.../humidity1_alarm
> +Date: June 2016
> +KernelVersion: 4.8
> +Contact: David Frey <david.frey@...sirion.com>,
> + Pascal Sachs <pascal.sachs@...sirion.com>
> +Description: (RO) humidity alarm
> + 0: no alarm
> + 1: alarm is set when the humidity is outside the configured
> + limits
> + Only works in periodic measure mode
> +
> +What: /sys/bus/i2c/devices/.../heater_enable
> +Date: July 2016
> +KernelVersion: 4.8
> +Contact: David Frey <david.frey@...sirion.com>,
> + Pascal Sachs <pascal.sachs@...sirion.com>
> +Description: (RW) Enable on-chip heater to remove excess humidity from sensor
> + 0: turned off
> + 1: turned on
> +
> +What: /sys/bus/i2c/devices/.../update_interval
> +Date: June 2016
> +KernelVersion: 4.8
> +Contact: David Frey <david.frey@...sirion.com>,
> + Pascal Sachs <pascal.sachs@...sirion.com>
> +Description: (RW) value is 0 for single shot, otherwise it is interval in
> + msec for periodic measurement.
> + The allowed update_interval in milliseconds are as follows:
> + * 0 single shot mode
> + * 2000 0.5 Hz periodic measurement
> + * 1000 1 Hz periodic measurement
> + * 500 2 Hz periodic measurement
> + * 250 4 Hz periodic measurement
> + * 100 10 Hz periodic measurement
> + If the interval is not supported by the sensor, the next faster
> + interval is chosen.
> + Unit: milliseconds
> diff --git a/Documentation/hwmon/sht3x b/Documentation/hwmon/sht3x
> index b0d88184f48e..744dc9b00e8b 100644
> --- a/Documentation/hwmon/sht3x
> +++ b/Documentation/hwmon/sht3x
> @@ -49,28 +49,3 @@ the alert pin on the sensor is set to high.
> When the temperature and humidity readings move back between the hysteresis
> values, the alert bit is set to 0 and the alert pin on the sensor is set to
> low.
> -
> -sysfs-Interface
> ----------------
> -
> -temp1_input: temperature input
> -humidity1_input: humidity input
> -temp1_max: temperature max value
> -temp1_max_hyst: temperature hysteresis value for max limit
> -humidity1_max: humidity max value
> -humidity1_max_hyst: humidity hysteresis value for max limit
> -temp1_min: temperature min value
> -temp1_min_hyst: temperature hysteresis value for min limit
> -humidity1_min: humidity min value
> -humidity1_min_hyst: humidity hysteresis value for min limit
> -temp1_alarm: alarm flag is set to 1 if the temperature is outside the
> - configured limits. Alarm only works in periodic measure mode
> -humidity1_alarm: alarm flag is set to 1 if the humidity is outside the
> - configured limits. Alarm only works in periodic measure mode
> -heater_enable: heater enable, heating element removes excess humidity from
> - sensor
> - 0: turned off
> - 1: turned on
> -update_interval: update interval, 0 for single shot, interval in msec
> - for periodic measurement. If the interval is not supported
> - by the sensor, the next faster interval is chosen
> --
> 2.15.1
>
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