[v2] Support for MELFAS MIP4 touchkey devices

[PATCH RFC v2 0/5] Support for MELFAS MIP4 touchkey devices

Posted by Kaustabh Chakraborty 3 months, 4 weeks ago

MIP4 is a protocol developed and used by MELFAS in its touchscreen and
touchkey devices. The MIP4 touchscreen driver acknowledges the
touchscreen capabilities, but touchkeys are left unimplemented.

Apart from touchscreen + touchkey devices, the protocol is also used by
devices which are, functionally, touchkey devices. Thus, the driver
should also be compatible with those devices. This series aims to
introduce such required changes.

RFC: How should the compatible string be handled? The string defined in
dtschema is 'melfas,mip4_ts', which implies that it's a MIP4 *touchscreen*
by MELFAS.

Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>
---
Changes in v2:
- rewrite MIP4 documentation in dtschema (robh)
- Link to v1: https://lore.kernel.org/r/20250503-mip4-touchkey-v1-0-b483cda29a5b@disroot.org

---
Kaustabh Chakraborty (5):
      dt-bindings: input: melfas-mip4: convert to dtschema
      dt-bindings: input: melfas-mip4: document linux,keycodes property
      Input: melfas-mip4 - add support for touchkey input events
      Input: melfas-mip4 - initialize touch events only if the device is a touchscreen
      Input: melfas-mip4 - add support for event formats 4 and 9

 .../bindings/input/touchscreen/melfas,mip4_ts.yaml | 61 ++++++++++++++
 .../bindings/input/touchscreen/melfas_mip4.txt     | 20 -----
 drivers/input/touchscreen/melfas_mip4.c            | 98 ++++++++++++++++------
 3 files changed, 133 insertions(+), 46 deletions(-)
---
base-commit: 0bb71d301869446810a0b13d3da290bd455d7c78
change-id: 20250501-mip4-touchkey-66a113226bce

Best regards,
-- 
Kaustabh Chakraborty <kauschluss@disroot.org>

Re: [PATCH RFC v2 0/5] Support for MELFAS MIP4 touchkey devices

Posted by Kaustabh Chakraborty 3 months, 4 weeks ago

On 2025-06-12 19:41, Kaustabh Chakraborty wrote:
> MIP4 is a protocol developed and used by MELFAS in its touchscreen and
> touchkey devices. The MIP4 touchscreen driver acknowledges the
> touchscreen capabilities, but touchkeys are left unimplemented.
> 
> Apart from touchscreen + touchkey devices, the protocol is also used by
> devices which are, functionally, touchkey devices. Thus, the driver
> should also be compatible with those devices. This series aims to
> introduce such required changes.
> 
> RFC: How should the compatible string be handled? The string defined in
> dtschema is 'melfas,mip4_ts', which implies that it's a MIP4 *touchscreen*
> by MELFAS.

I see that there are 2 dts(i) files which use the compatible
"melfas,mip4_ts", as discovered from a simple grep in arch/. They are:
- arm64/qcom/msm8916-lg-m216.dts
- arm64/mediatek/mt8173-elm-hana.dtsi

Is it possible to change all references of the compatible to something more
generic, such as "melfas,mip4"?