Refactor filter config for AD7192 #2742
Conversation
…rror handling. Factor out everything under the lock, use guard() for the mutex to avoid need to manually unlock, and switch sense of matching checks in loops to reduce indent. There are some functional changes in here as well as the code no longer updates the filter_freq_available if no change has been made to the oversampling ratio. Cc: Alisa-Dariana Roman <[email protected]> Reviewed-by: Nuno Sá <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jonathan Cameron <[email protected]>
…direct() These new functions allow sparse to find failures to release direct mode reducing chances of bugs over the claim_direct_mode() functions that are deprecated. Cc: Alisa-Dariana Roman <[email protected]> Reviewed-by: Nuno Sá <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jonathan Cameron <[email protected]>
While a calibration is running, better don't make the device do anything else. To enforce that, grab direct mode during calibration. Fixes: 42776c1 ("staging: iio: adc: ad7192: Add system calibration support") Signed-off-by: Uwe Kleine-König <[email protected]> Link: https://patch.msgid.link/8aade802afca6a89641e24c1ae1d4b8d82cff58d.1740655250.git.u.kleine-koenig@baylibre.com Signed-off-by: Jonathan Cameron <[email protected]>
It is not useful for users to set the 3db filter frequency or the oversampling value. Remove these and use a filter mode instead. Expose to user the filter mode, which provides an intuitive way to select filter behaviour. Signed-off-by: Alisa-Dariana Roman <[email protected]>
romandariana
requested review from
nunojsa,
mhennerich,
dbogdan,
btogorean,
chegbeli,
buha,
amiclaus,
rbolboac,
danmois,
CiprianRegus and
machschmitt
as code owners
Before going into the review, not sure this is acceptable. Removing attributes like this breaks ABI and potential users of it. You can ask about this upstream but typically is not doable. That means we might have to live with the old interface. Now, what you can do (if you're willing to) is to support filter_mode together with what we have now. You said something like: "these are set automatically based on sampling frequency and filter mode" So you can support filter_mode and set the above values automatically but still report them on the "legacy" interfaces. On the write side might be a bit more complex but should be also doable in "reusable" way. Then, we need to document this (ideally also upstream) and encourage users to use filter_mode instead of the legacy interfaces. The above would be my approach and when sending the patch upstream, I would still question in the cover about the possibility of removing the old interfaces. |
PR Description
The first 3 commits are cherry-picked from the iio tree for synchronization.
The last commit is a big rework of the driver. Instead of letting the user set the 3db filter frequency or the oversampling ratio, it makes a lot more sense to expose the filter mode (like in ad4130.c). The user can set the sampling frequency and the filter mode, which provide the user with useful information about notch placement, settling time, noise rejection. Remove the 3db and oversampling options, these are set automatically based on sampling frequency and filter mode.
PR Type
PR Checklist