Sorry again folks - I picked you as recipients just because I assumed you could have something to say in here. Again, please let me know if you wish to be dropped from CC if this gets any further.
power: supply: add sw-gauge for SOC estimation and CC correction This RFC has still not been properly tested in HW - even if I actually managed to run the iteration at some point of development :) So still no accurate review or any kind of final acceptance is asked. I am hoping to get some opinions/guidance regarding this :) All help is highly appreciated! "The thing" for which I would like to get the initial feedback is in patch 2 - rest of the patches give some context to it :) I have couple of ROHM PMIC drivers for devices with battery charger and coulomb counter in device. Some users have asked me if these drivers could be added upstream - and I actually think it would help people. While evaluating these drivers I saw they do implement some fuel-gauging/CC correcting logic - which might be useful for other similar ICs. Hence I am wondering if I should try pulling the logic out of IC drivers to power-supply core while leaving just IC specific code in drivers. This RFC is first result for pulling the logic out of drivers. In other words, this is an early state RFC for adding some fuel-gauge logic to power-supply core. I am overall asking if this kind of functionality would be welcome in power-supply core, and if yes - then I would like to get some overall direction for this. I am for example wondering if this should be added as a own entity which uses power-supply class underneath (in a way this RFC introduces it) - or if it should be meld in existing power-supply class. But there's no point in pondering this if this kind of functionality has no chance being accepted :) Is this seen as potentially useful feature which should be in-kernel? (I think this has it's place in-kernel as HW details like coulomb-counter adjustment should really not be something user-space should care. Another reason is that few low-power embedded devices actually do periodical wake-up from suspend/ other low-power states just to do CC adjustment - even though the wake-up costs some power. If this is ever to be supported by mainline kernel - then waking up the whole user-space just to do this CC adjustment iteration is not preferable. But that wake-up is not covered by this RFC, it is just one motvation behind putting this in-kernel - where it in my opinion would be better to be generic and available for all ICs than written in each IC specific driver). Oh, please let me know if you wish to see some more documentation, I can try adding something in Documentation folder too. Changelog RFC v2: - lots of logic fixes. - rechecked units - changed low-voltage correction to capacity correction - added first draft of IC driver which could use the swgauge Patch 1: - Adds cap2ocv helper (should be reworked to allow 0.1% accuracy for cap) Patch 2: - Add the swgauge (better name would be nice). The main thing in this RFC Patch 3, 4: - bring in some charger register descriptions etc for the driver Patch 5: - add charger driver for ROHM BD718(27/28/78) PMICs as an example Patch 6: - fix the device ID --- Matti Vaittinen (6): power: supply: add cap2ocv batinfo helper power: supply: add sw-gauge for SOC estimation and CC correction mfd: prepare to support BD718xx-charger mfd: add BD71827 header power: supply: Add bd718(27/28/78) charger driver MFD: bd71828: differentiate bd71828 and bd71827 chargers drivers/mfd/rohm-bd71828.c | 2 +- drivers/power/supply/Kconfig | 18 + drivers/power/supply/Makefile | 2 + drivers/power/supply/bd71827-power.c | 2162 +++++++++++++++++++ drivers/power/supply/power_supply_core.c | 51 + drivers/power/supply/power_supply_swgauge.c | 1025 +++++++++ include/linux/mfd/rohm-bd71827.h | 295 +++ include/linux/mfd/rohm-bd71828.h | 65 + include/linux/mfd/rohm-generic.h | 2 + include/linux/power/sw_gauge.h | 225 ++ include/linux/power_supply.h | 11 + 11 files changed, 3857 insertions(+), 1 deletion(-) create mode 100644 drivers/power/supply/bd71827-power.c create mode 100644 drivers/power/supply/power_supply_swgauge.c create mode 100644 include/linux/mfd/rohm-bd71827.h create mode 100644 include/linux/power/sw_gauge.h base-commit: 09162bc32c880a791c6c0668ce0745cf7958f576 -- 2.25.4 -- Matti Vaittinen, Linux device drivers ROHM Semiconductors, Finland SWDC Kiviharjunlenkki 1E 90220 OULU FINLAND ~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~ Simon says - in Latin please. ~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~ Thanks to Simon Glass for the translation =]
