On Wed, Mar 23, 2022 at 10:00 PM Alistair Francis <alistair@xxxxxxxxxxxxx> wrote: > > This patch series builds on top of [1] and adds support for the cyttsp5 > touchscreen controller for the reMarkable 2. > > I first tried to add an I2C HID device. Although the cyttsp5 has some HID > looking aspects it is not HID compatible. Just in trying to probe the device > I found: > - The HID descriptor has extra padding > - The HID descriptor sets the high bytes of the descriptor length > - The HID descriptor has extra unrecognised tags > - The HID reset command doesn't appear to work > > I don't think there is a way to use the I2C HID framework with the cyttsp5. > For anyone interested you can see the work here [2]. In that branch though I > can only obtain a HID descriptor, nothing else works without more core > changes. > > So instead I rebased the series from [1]. Converted to the new yaml DTS > documentation, added regulator support and fixed a x/y miscalculation bug. The DT bindings have been reviewed, any comments on the driver implementation? It has been tested on a few different devices Alistair > > 1: https://lwn.net/ml/linux-kernel/20180703094309.18514-1-mylene.josserand@xxxxxxxxxxx/ > 2: https://github.com/alistair23/linux/commits/rM2-mainline-cyttsp5-hid > > v7: > - Fix device tree warnings > v6: > - Use reg for the button properties > v5: > - Address review comments from v4 > > Alistair Francis (4): > Input: Add driver for Cypress Generation 5 touchscreen > dt-bindings: input: Add Cypress TT2100 touchscreen controller > ARM: imx_v6_v7_defconfig: Enable the cyttsp5 touchscreen > ARM: dts: imx7d-remarkable2: Enable the cyttsp5 > > .../input/touchscreen/cypress,tt21000.yaml | 101 ++ > arch/arm/boot/dts/imx7d-remarkable2.dts | 100 ++ > arch/arm/configs/imx_v6_v7_defconfig | 1 + > drivers/input/touchscreen/Kconfig | 16 + > drivers/input/touchscreen/Makefile | 1 + > drivers/input/touchscreen/cyttsp5.c | 902 ++++++++++++++++++ > 6 files changed, 1121 insertions(+) > create mode 100644 Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml > create mode 100644 drivers/input/touchscreen/cyttsp5.c > > -- > 2.35.1 >
